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Eric Andersen25f27032001-04-26 23:22:31 +00001/* vi: set sw=4 ts=4: */
2/*
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003 * A prototype Bourne shell grammar parser.
4 * Intended to follow the original Thompson and Ritchie
5 * "small and simple is beautiful" philosophy, which
6 * incidentally is a good match to today's BusyBox.
Eric Andersen25f27032001-04-26 23:22:31 +00007 *
Denis Vlasenkoce4acbb2009-04-10 23:23:41 +00008 * Copyright (C) 2000,2001 Larry Doolittle <larry@doolittle.boa.org>
Denis Vlasenkoc8d27332009-04-06 10:47:21 +00009 * Copyright (C) 2008,2009 Denys Vlasenko <vda.linux@googlemail.com>
Eric Andersen25f27032001-04-26 23:22:31 +000010 *
Denys Vlasenkobbecd742010-10-03 17:22:52 +020011 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
12 *
Eric Andersen25f27032001-04-26 23:22:31 +000013 * Credits:
14 * The parser routines proper are all original material, first
Eric Andersencb81e642003-07-14 21:21:08 +000015 * written Dec 2000 and Jan 2001 by Larry Doolittle. The
16 * execution engine, the builtins, and much of the underlying
17 * support has been adapted from busybox-0.49pre's lash, which is
Eric Andersenc7bda1c2004-03-15 08:29:22 +000018 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
Eric Andersencb81e642003-07-14 21:21:08 +000019 * written by Erik Andersen <andersen@codepoet.org>. That, in turn,
20 * is based in part on ladsh.c, by Michael K. Johnson and Erik W.
21 * Troan, which they placed in the public domain. I don't know
22 * how much of the Johnson/Troan code has survived the repeated
23 * rewrites.
24 *
Eric Andersen25f27032001-04-26 23:22:31 +000025 * Other credits:
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +000026 * o_addchr derived from similar w_addchar function in glibc-2.2.
Denis Vlasenko50f3aa42009-04-07 10:52:40 +000027 * parse_redirect, redirect_opt_num, and big chunks of main
Denis Vlasenko424f79b2009-03-22 14:23:34 +000028 * and many builtins derived from contributions by Erik Andersen.
29 * Miscellaneous bugfixes from Matt Kraai.
Eric Andersen25f27032001-04-26 23:22:31 +000030 *
31 * There are two big (and related) architecture differences between
32 * this parser and the lash parser. One is that this version is
33 * actually designed from the ground up to understand nearly all
34 * of the Bourne grammar. The second, consequential change is that
35 * the parser and input reader have been turned inside out. Now,
36 * the parser is in control, and asks for input as needed. The old
37 * way had the input reader in control, and it asked for parsing to
38 * take place as needed. The new way makes it much easier to properly
39 * handle the recursion implicit in the various substitutions, especially
40 * across continuation lines.
41 *
Denys Vlasenko349ef962010-05-21 15:46:24 +020042 * TODOs:
43 * grep for "TODO" and fix (some of them are easy)
Denys Vlasenkoa6ad3972010-05-22 00:26:06 +020044 * make complex ${var%...} constructs support optional
45 * make here documents optional
Denys Vlasenko203fd7b2017-07-17 16:13:35 +020046 * special variables (done: PWD, PPID, RANDOM)
47 * follow IFS rules more precisely, including update semantics
48 * tilde expansion
49 * aliases
Denys Vlasenko57000292018-01-12 14:41:45 +010050 * "command" missing features:
51 * command -p CMD: run CMD using default $PATH
52 * (can use this to override standalone shell as well?)
Denys Vlasenko1e660422017-07-17 21:10:50 +020053 * command BLTIN: disables special-ness (e.g. errors do not abort)
Denys Vlasenko57000292018-01-12 14:41:45 +010054 * command -V CMD1 CMD2 CMD3 (multiple args) (not in standard)
55 * builtins mandated by standards we don't support:
56 * [un]alias, fc:
Denys Vlasenko203fd7b2017-07-17 16:13:35 +020057 * fc -l[nr] [BEG] [END]: list range of commands in history
58 * fc [-e EDITOR] [BEG] [END]: edit/rerun range of commands
59 * fc -s [PAT=REP] [CMD]: rerun CMD, replacing PAT with REP
Mike Frysinger25a6ca02009-03-28 13:59:26 +000060 *
Denys Vlasenkoadc0e202010-05-17 18:56:58 +020061 * Bash compat TODO:
62 * redirection of stdout+stderr: &> and >&
Denys Vlasenkoadc0e202010-05-17 18:56:58 +020063 * reserved words: function select
64 * advanced test: [[ ]]
Denys Vlasenkoadc0e202010-05-17 18:56:58 +020065 * process substitution: <(list) and >(list)
66 * =~: regex operator
Denys Vlasenko9ca656b2009-06-10 13:39:35 +020067 * let EXPR [EXPR...]
Denys Vlasenko349ef962010-05-21 15:46:24 +020068 * Each EXPR is an arithmetic expression (ARITHMETIC EVALUATION)
69 * If the last arg evaluates to 0, let returns 1; 0 otherwise.
70 * NB: let `echo 'a=a + 1'` - error (IOW: multi-word expansion is used)
Denys Vlasenko9ca656b2009-06-10 13:39:35 +020071 * ((EXPR))
Denys Vlasenko349ef962010-05-21 15:46:24 +020072 * The EXPR is evaluated according to ARITHMETIC EVALUATION.
73 * This is exactly equivalent to let "EXPR".
Denys Vlasenkoadc0e202010-05-17 18:56:58 +020074 * $[EXPR]: synonym for $((EXPR))
Denys Vlasenko203fd7b2017-07-17 16:13:35 +020075 * indirect expansion: ${!VAR}
76 * substring op on @: ${@:n:m}
Denys Vlasenkobbecd742010-10-03 17:22:52 +020077 *
78 * Won't do:
Denys Vlasenko203fd7b2017-07-17 16:13:35 +020079 * Some builtins mandated by standards:
80 * newgrp [GRP]: not a builtin in bash but a suid binary
81 * which spawns a new shell with new group ID
Denys Vlasenko3632cb12018-04-10 15:25:41 +020082 *
83 * Status of [[ support:
84 * [[ args ]] are CMD_SINGLEWORD_NOGLOB:
85 * v='a b'; [[ $v = 'a b' ]]; echo 0:$?
Denys Vlasenko89e9d552018-04-11 01:15:33 +020086 * [[ /bin/n* ]]; echo 0:$?
Denys Vlasenko3632cb12018-04-10 15:25:41 +020087 * TODO:
88 * &&/|| are AND/OR ops, -a/-o are not
89 * quoting needs to be considered (-f is an operator, "-f" and ""-f are not; etc)
90 * = is glob match operator, not equality operator: STR = GLOB
91 * (in GLOB, quoting is significant on char-by-char basis: a*cd"*")
92 * == same as =
93 * add =~ regex match operator: STR =~ REGEX
Eric Andersen25f27032001-04-26 23:22:31 +000094 */
Denys Vlasenko202a2d12010-07-16 12:36:14 +020095//config:config HUSH
Denys Vlasenko4eed2c62017-07-18 22:01:24 +020096//config: bool "hush (64 kb)"
Denys Vlasenko202a2d12010-07-16 12:36:14 +020097//config: default y
98//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +020099//config: hush is a small shell. It handles the normal flow control
100//config: constructs such as if/then/elif/else/fi, for/in/do/done, while loops,
101//config: case/esac. Redirections, here documents, $((arithmetic))
102//config: and functions are supported.
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200103//config:
Denys Vlasenko72089cf2017-07-21 09:50:55 +0200104//config: It will compile and work on no-mmu systems.
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200105//config:
Denys Vlasenko72089cf2017-07-21 09:50:55 +0200106//config: It does not handle select, aliases, tilde expansion,
107//config: &>file and >&file redirection of stdout+stderr.
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200108//config:
109//config:config HUSH_BASH_COMPAT
110//config: bool "bash-compatible extensions"
111//config: default y
Denys Vlasenko0b883582016-12-23 16:49:07 +0100112//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200113//config:
Denys Vlasenko9e800222010-10-03 14:28:04 +0200114//config:config HUSH_BRACE_EXPANSION
115//config: bool "Brace expansion"
116//config: default y
117//config: depends on HUSH_BASH_COMPAT
118//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +0200119//config: Enable {abc,def} extension.
Denys Vlasenko9e800222010-10-03 14:28:04 +0200120//config:
Denys Vlasenko5807e182018-02-08 19:19:04 +0100121//config:config HUSH_LINENO_VAR
122//config: bool "$LINENO variable"
123//config: default y
124//config: depends on HUSH_BASH_COMPAT
125//config:
Denys Vlasenko54c21112018-01-27 20:46:45 +0100126//config:config HUSH_BASH_SOURCE_CURDIR
127//config: bool "'source' and '.' builtins search current directory after $PATH"
128//config: default n # do not encourage non-standard behavior
129//config: depends on HUSH_BASH_COMPAT
130//config: help
131//config: This is not compliant with standards. Avoid if possible.
132//config:
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200133//config:config HUSH_INTERACTIVE
134//config: bool "Interactive mode"
135//config: default y
Denys Vlasenko0b883582016-12-23 16:49:07 +0100136//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200137//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +0200138//config: Enable interactive mode (prompt and command editing).
139//config: Without this, hush simply reads and executes commands
140//config: from stdin just like a shell script from a file.
141//config: No prompt, no PS1/PS2 magic shell variables.
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200142//config:
Denys Vlasenko99862cb2010-09-12 17:34:13 +0200143//config:config HUSH_SAVEHISTORY
144//config: bool "Save command history to .hush_history"
145//config: default y
146//config: depends on HUSH_INTERACTIVE && FEATURE_EDITING_SAVEHISTORY
Denys Vlasenko99862cb2010-09-12 17:34:13 +0200147//config:
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200148//config:config HUSH_JOB
149//config: bool "Job control"
150//config: default y
151//config: depends on HUSH_INTERACTIVE
152//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +0200153//config: Enable job control: Ctrl-Z backgrounds, Ctrl-C interrupts current
154//config: command (not entire shell), fg/bg builtins work. Without this option,
155//config: "cmd &" still works by simply spawning a process and immediately
156//config: prompting for next command (or executing next command in a script),
157//config: but no separate process group is formed.
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200158//config:
159//config:config HUSH_TICK
Denys Vlasenkof5604222017-01-10 14:58:54 +0100160//config: bool "Support process substitution"
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200161//config: default y
Denys Vlasenko0b883582016-12-23 16:49:07 +0100162//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200163//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +0200164//config: Enable `command` and $(command).
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200165//config:
166//config:config HUSH_IF
167//config: bool "Support if/then/elif/else/fi"
168//config: default y
Denys Vlasenko0b883582016-12-23 16:49:07 +0100169//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200170//config:
171//config:config HUSH_LOOPS
172//config: bool "Support for, while and until loops"
173//config: default y
Denys Vlasenko0b883582016-12-23 16:49:07 +0100174//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200175//config:
176//config:config HUSH_CASE
177//config: bool "Support case ... esac statement"
178//config: default y
Denys Vlasenko0b883582016-12-23 16:49:07 +0100179//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200180//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +0200181//config: Enable case ... esac statement. +400 bytes.
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200182//config:
183//config:config HUSH_FUNCTIONS
184//config: bool "Support funcname() { commands; } syntax"
185//config: default y
Denys Vlasenko0b883582016-12-23 16:49:07 +0100186//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200187//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +0200188//config: Enable support for shell functions. +800 bytes.
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200189//config:
190//config:config HUSH_LOCAL
Denys Vlasenko7a85c602017-01-08 17:40:18 +0100191//config: bool "local builtin"
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200192//config: default y
193//config: depends on HUSH_FUNCTIONS
194//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +0200195//config: Enable support for local variables in functions.
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200196//config:
197//config:config HUSH_RANDOM_SUPPORT
198//config: bool "Pseudorandom generator and $RANDOM variable"
199//config: default y
Denys Vlasenko0b883582016-12-23 16:49:07 +0100200//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200201//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +0200202//config: Enable pseudorandom generator and dynamic variable "$RANDOM".
203//config: Each read of "$RANDOM" will generate a new pseudorandom value.
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200204//config:
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200205//config:config HUSH_MODE_X
206//config: bool "Support 'hush -x' option and 'set -x' command"
207//config: default y
Denys Vlasenko0b883582016-12-23 16:49:07 +0100208//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200209//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +0200210//config: This instructs hush to print commands before execution.
211//config: Adds ~300 bytes.
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200212//config:
Denys Vlasenko1cc68042017-01-09 17:10:04 +0100213//config:config HUSH_ECHO
214//config: bool "echo builtin"
215//config: default y
216//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko1cc68042017-01-09 17:10:04 +0100217//config:
218//config:config HUSH_PRINTF
219//config: bool "printf builtin"
220//config: default y
221//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenkof5604222017-01-10 14:58:54 +0100222//config:
Denys Vlasenko265062d2017-01-10 15:13:30 +0100223//config:config HUSH_TEST
224//config: bool "test builtin"
225//config: default y
226//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
227//config:
Denys Vlasenkof5604222017-01-10 14:58:54 +0100228//config:config HUSH_HELP
229//config: bool "help builtin"
230//config: default y
231//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko1cc68042017-01-09 17:10:04 +0100232//config:
Denys Vlasenko6ec76d82017-01-08 18:40:41 +0100233//config:config HUSH_EXPORT
234//config: bool "export builtin"
235//config: default y
236//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko6ec76d82017-01-08 18:40:41 +0100237//config:
238//config:config HUSH_EXPORT_N
239//config: bool "Support 'export -n' option"
240//config: default y
241//config: depends on HUSH_EXPORT
242//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +0200243//config: export -n unexports variables. It is a bash extension.
Denys Vlasenko6ec76d82017-01-08 18:40:41 +0100244//config:
Denys Vlasenko1e660422017-07-17 21:10:50 +0200245//config:config HUSH_READONLY
246//config: bool "readonly builtin"
247//config: default y
Denys Vlasenko6b0695b2017-07-17 21:47:27 +0200248//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko1e660422017-07-17 21:10:50 +0200249//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +0200250//config: Enable support for read-only variables.
Denys Vlasenko1e660422017-07-17 21:10:50 +0200251//config:
Denys Vlasenko7a85c602017-01-08 17:40:18 +0100252//config:config HUSH_KILL
Denys Vlasenkof5604222017-01-10 14:58:54 +0100253//config: bool "kill builtin (supports kill %jobspec)"
Denys Vlasenko7a85c602017-01-08 17:40:18 +0100254//config: default y
255//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko7a85c602017-01-08 17:40:18 +0100256//config:
257//config:config HUSH_WAIT
258//config: bool "wait builtin"
259//config: default y
260//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko7a85c602017-01-08 17:40:18 +0100261//config:
Denys Vlasenko3bb3e1d2018-01-11 18:05:05 +0100262//config:config HUSH_COMMAND
263//config: bool "command builtin"
264//config: default y
265//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
266//config:
Denys Vlasenko7a85c602017-01-08 17:40:18 +0100267//config:config HUSH_TRAP
268//config: bool "trap builtin"
269//config: default y
270//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko7a85c602017-01-08 17:40:18 +0100271//config:
272//config:config HUSH_TYPE
273//config: bool "type builtin"
274//config: default y
275//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko7a85c602017-01-08 17:40:18 +0100276//config:
Denys Vlasenko11f2e992017-08-10 16:34:03 +0200277//config:config HUSH_TIMES
278//config: bool "times builtin"
279//config: default y
280//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
281//config:
Denys Vlasenko7a85c602017-01-08 17:40:18 +0100282//config:config HUSH_READ
283//config: bool "read builtin"
284//config: default y
285//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko7a85c602017-01-08 17:40:18 +0100286//config:
Denys Vlasenko10d5ece2017-01-08 18:28:43 +0100287//config:config HUSH_SET
288//config: bool "set builtin"
289//config: default y
290//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko10d5ece2017-01-08 18:28:43 +0100291//config:
292//config:config HUSH_UNSET
293//config: bool "unset builtin"
294//config: default y
295//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenkof5604222017-01-10 14:58:54 +0100296//config:
297//config:config HUSH_ULIMIT
298//config: bool "ulimit builtin"
299//config: default y
300//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko10d5ece2017-01-08 18:28:43 +0100301//config:
Denys Vlasenkod5933b12017-01-08 18:31:39 +0100302//config:config HUSH_UMASK
303//config: bool "umask builtin"
304//config: default y
305//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenkod5933b12017-01-08 18:31:39 +0100306//config:
Denys Vlasenko74d40582017-08-11 01:32:46 +0200307//config:config HUSH_GETOPTS
308//config: bool "getopts builtin"
309//config: default y
310//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
311//config:
Denys Vlasenko44719692017-01-08 18:44:41 +0100312//config:config HUSH_MEMLEAK
313//config: bool "memleak builtin (debugging)"
314//config: default n
315//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200316
Denys Vlasenko20704f02011-03-23 17:59:27 +0100317//applet:IF_HUSH(APPLET(hush, BB_DIR_BIN, BB_SUID_DROP))
Denys Vlasenko205d48e2017-01-29 14:57:33 +0100318// APPLET_ODDNAME:name main location suid_type help
Denys Vlasenko205d48e2017-01-29 14:57:33 +0100319//applet:IF_SH_IS_HUSH( APPLET_ODDNAME(sh, hush, BB_DIR_BIN, BB_SUID_DROP, hush))
Denys Vlasenko0b883582016-12-23 16:49:07 +0100320//applet:IF_BASH_IS_HUSH(APPLET_ODDNAME(bash, hush, BB_DIR_BIN, BB_SUID_DROP, hush))
Denys Vlasenko20704f02011-03-23 17:59:27 +0100321
322//kbuild:lib-$(CONFIG_HUSH) += hush.o match.o shell_common.o
Denys Vlasenko0b883582016-12-23 16:49:07 +0100323//kbuild:lib-$(CONFIG_SH_IS_HUSH) += hush.o match.o shell_common.o
324//kbuild:lib-$(CONFIG_BASH_IS_HUSH) += hush.o match.o shell_common.o
Denys Vlasenko20704f02011-03-23 17:59:27 +0100325//kbuild:lib-$(CONFIG_HUSH_RANDOM_SUPPORT) += random.o
326
Denys Vlasenkof2ed39b2018-04-05 16:46:49 +0200327/* -i (interactive) is also accepted,
328 * but does nothing, therefore not shown in help.
Dan Fandrich89ca2f92010-11-28 01:54:39 +0100329 * NOMMU-specific options are not meant to be used by users,
330 * therefore we don't show them either.
331 */
332//usage:#define hush_trivial_usage
Denys Vlasenkof2ed39b2018-04-05 16:46:49 +0200333//usage: "[-enxl] [-c 'SCRIPT' [ARG0 [ARGS]] / FILE [ARGS] / -s [ARGS]]"
Denys Vlasenkob0b83432011-03-07 12:34:59 +0100334//usage:#define hush_full_usage "\n\n"
335//usage: "Unix shell interpreter"
336
Denys Vlasenko67047462016-12-22 15:21:58 +0100337#if !(defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) \
338 || defined(__APPLE__) \
339 )
340# include <malloc.h> /* for malloc_trim */
341#endif
342#include <glob.h>
343/* #include <dmalloc.h> */
344#if ENABLE_HUSH_CASE
345# include <fnmatch.h>
346#endif
Denys Vlasenko11f2e992017-08-10 16:34:03 +0200347#include <sys/times.h>
Denys Vlasenko67047462016-12-22 15:21:58 +0100348#include <sys/utsname.h> /* for setting $HOSTNAME */
349
350#include "busybox.h" /* for APPLET_IS_NOFORK/NOEXEC */
351#include "unicode.h"
352#include "shell_common.h"
353#include "math.h"
354#include "match.h"
355#if ENABLE_HUSH_RANDOM_SUPPORT
356# include "random.h"
357#else
358# define CLEAR_RANDOM_T(rnd) ((void)0)
359#endif
360#ifndef F_DUPFD_CLOEXEC
361# define F_DUPFD_CLOEXEC F_DUPFD
362#endif
363#ifndef PIPE_BUF
364# define PIPE_BUF 4096 /* amount of buffering in a pipe */
365#endif
366
Denis Vlasenko1943aec2009-04-09 14:15:57 +0000367
Kang-Che Sung027d3ab2017-01-11 14:18:15 +0100368/* So far, all bash compat is controlled by one config option */
369/* Separate defines document which part of code implements what */
370#define BASH_PATTERN_SUBST ENABLE_HUSH_BASH_COMPAT
371#define BASH_SUBSTR ENABLE_HUSH_BASH_COMPAT
Kang-Che Sung027d3ab2017-01-11 14:18:15 +0100372#define BASH_SOURCE ENABLE_HUSH_BASH_COMPAT
373#define BASH_HOSTNAME_VAR ENABLE_HUSH_BASH_COMPAT
Denys Vlasenko4ee824f2017-07-03 01:22:13 +0200374#define BASH_TEST2 (ENABLE_HUSH_BASH_COMPAT && ENABLE_HUSH_TEST)
Denys Vlasenko1f41c882017-08-09 13:52:36 +0200375#define BASH_READ_D ENABLE_HUSH_BASH_COMPAT
Kang-Che Sung027d3ab2017-01-11 14:18:15 +0100376
377
Denys Vlasenko8d7be232009-05-25 16:38:32 +0200378/* Build knobs */
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +0000379#define LEAK_HUNTING 0
380#define BUILD_AS_NOMMU 0
381/* Enable/disable sanity checks. Ok to enable in production,
382 * only adds a bit of bloat. Set to >1 to get non-production level verbosity.
383 * Keeping 1 for now even in released versions.
384 */
385#define HUSH_DEBUG 1
Denys Vlasenko8d7be232009-05-25 16:38:32 +0200386/* Slightly bigger (+200 bytes), but faster hush.
387 * So far it only enables a trick with counting SIGCHLDs and forks,
388 * which allows us to do fewer waitpid's.
389 * (we can detect a case where neither forks were done nor SIGCHLDs happened
390 * and therefore waitpid will return the same result as last time)
391 */
392#define ENABLE_HUSH_FAST 0
Denys Vlasenko9297dbc2010-07-05 21:37:12 +0200393/* TODO: implement simplified code for users which do not need ${var%...} ops
394 * So far ${var%...} ops are always enabled:
395 */
396#define ENABLE_HUSH_DOLLAR_OPS 1
Denis Vlasenko1943aec2009-04-09 14:15:57 +0000397
398
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +0000399#if BUILD_AS_NOMMU
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +0000400# undef BB_MMU
401# undef USE_FOR_NOMMU
402# undef USE_FOR_MMU
403# define BB_MMU 0
404# define USE_FOR_NOMMU(...) __VA_ARGS__
405# define USE_FOR_MMU(...)
406#endif
407
Denys Vlasenko1fcbff22010-06-26 02:40:08 +0200408#include "NUM_APPLETS.h"
Denys Vlasenko14974842010-03-23 01:08:26 +0100409#if NUM_APPLETS == 1
Denis Vlasenko61befda2008-11-25 01:36:03 +0000410/* STANDALONE does not make sense, and won't compile */
Denis Vlasenkoce4acbb2009-04-10 23:23:41 +0000411# undef CONFIG_FEATURE_SH_STANDALONE
412# undef ENABLE_FEATURE_SH_STANDALONE
Denis Vlasenko5e34ff22009-04-21 11:09:40 +0000413# undef IF_FEATURE_SH_STANDALONE
Denys Vlasenko14974842010-03-23 01:08:26 +0100414# undef IF_NOT_FEATURE_SH_STANDALONE
415# define ENABLE_FEATURE_SH_STANDALONE 0
Denis Vlasenko5e34ff22009-04-21 11:09:40 +0000416# define IF_FEATURE_SH_STANDALONE(...)
417# define IF_NOT_FEATURE_SH_STANDALONE(...) __VA_ARGS__
Denis Vlasenko61befda2008-11-25 01:36:03 +0000418#endif
419
Denis Vlasenko05743d72008-02-10 12:10:08 +0000420#if !ENABLE_HUSH_INTERACTIVE
Denis Vlasenkoce4acbb2009-04-10 23:23:41 +0000421# undef ENABLE_FEATURE_EDITING
422# define ENABLE_FEATURE_EDITING 0
423# undef ENABLE_FEATURE_EDITING_FANCY_PROMPT
424# define ENABLE_FEATURE_EDITING_FANCY_PROMPT 0
Denys Vlasenko8cab6672012-04-20 14:48:00 +0200425# undef ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
426# define ENABLE_FEATURE_EDITING_SAVE_ON_EXIT 0
Denis Vlasenko8412d792007-10-01 09:59:47 +0000427#endif
428
Denis Vlasenko424f79b2009-03-22 14:23:34 +0000429/* Do we support ANY keywords? */
430#if ENABLE_HUSH_IF || ENABLE_HUSH_LOOPS || ENABLE_HUSH_CASE
Denis Vlasenkoce4acbb2009-04-10 23:23:41 +0000431# define HAS_KEYWORDS 1
432# define IF_HAS_KEYWORDS(...) __VA_ARGS__
433# define IF_HAS_NO_KEYWORDS(...)
Denis Vlasenko424f79b2009-03-22 14:23:34 +0000434#else
Denis Vlasenkoce4acbb2009-04-10 23:23:41 +0000435# define HAS_KEYWORDS 0
436# define IF_HAS_KEYWORDS(...)
437# define IF_HAS_NO_KEYWORDS(...) __VA_ARGS__
Denis Vlasenko424f79b2009-03-22 14:23:34 +0000438#endif
Denis Vlasenko8412d792007-10-01 09:59:47 +0000439
Denis Vlasenkod01ff132007-05-02 21:40:23 +0000440/* If you comment out one of these below, it will be #defined later
441 * to perform debug printfs to stderr: */
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +0000442#define debug_printf(...) do {} while (0)
Denis Vlasenko400c5b62007-05-04 13:07:27 +0000443/* Finer-grained debug switches */
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +0000444#define debug_printf_parse(...) do {} while (0)
445#define debug_print_tree(a, b) do {} while (0)
446#define debug_printf_exec(...) do {} while (0)
Denis Vlasenkof886fd22008-10-13 12:36:05 +0000447#define debug_printf_env(...) do {} while (0)
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +0000448#define debug_printf_jobs(...) do {} while (0)
449#define debug_printf_expand(...) do {} while (0)
Denys Vlasenko1e811b12010-05-22 03:12:29 +0200450#define debug_printf_varexp(...) do {} while (0)
Denis Vlasenkob61e13d2008-06-17 05:11:43 +0000451#define debug_printf_glob(...) do {} while (0)
Denys Vlasenko2db74612017-07-07 22:07:28 +0200452#define debug_printf_redir(...) do {} while (0)
Denis Vlasenkob61e13d2008-06-17 05:11:43 +0000453#define debug_printf_list(...) do {} while (0)
Denis Vlasenko30c9cc52008-06-17 07:24:29 +0000454#define debug_printf_subst(...) do {} while (0)
Denys Vlasenko8d6eab32018-04-07 17:01:31 +0200455#define debug_printf_prompt(...) do {} while (0)
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +0000456#define debug_printf_clean(...) do {} while (0)
Denis Vlasenkod01ff132007-05-02 21:40:23 +0000457
Denis Vlasenkob6e65562009-04-03 16:49:04 +0000458#define ERR_PTR ((void*)(long)1)
459
Denys Vlasenkod5b5c2f2017-01-08 15:46:04 +0100460#define JOB_STATUS_FORMAT "[%u] %-22s %.40s\n"
Denis Vlasenko5ec61322008-06-24 00:50:07 +0000461
Denys Vlasenkoe85248a2010-05-22 06:20:26 +0200462#define _SPECIAL_VARS_STR "_*@$!?#"
463#define SPECIAL_VARS_STR ("_*@$!?#" + 1)
464#define NUMERIC_SPECVARS_STR ("_*@$!?#" + 3)
Kang-Che Sung027d3ab2017-01-11 14:18:15 +0100465#if BASH_PATTERN_SUBST
Denys Vlasenko36f774a2010-09-05 14:45:38 +0200466/* Support / and // replace ops */
467/* Note that // is stored as \ in "encoded" string representation */
468# define VAR_ENCODED_SUBST_OPS "\\/%#:-=+?"
469# define VAR_SUBST_OPS ("\\/%#:-=+?" + 1)
470# define MINUS_PLUS_EQUAL_QUESTION ("\\/%#:-=+?" + 5)
471#else
472# define VAR_ENCODED_SUBST_OPS "%#:-=+?"
473# define VAR_SUBST_OPS "%#:-=+?"
474# define MINUS_PLUS_EQUAL_QUESTION ("%#:-=+?" + 3)
475#endif
Denys Vlasenkoe85248a2010-05-22 06:20:26 +0200476
Denys Vlasenko932b9972018-01-11 12:39:48 +0100477#define SPECIAL_VAR_SYMBOL_STR "\3"
478#define SPECIAL_VAR_SYMBOL 3
479/* The "variable" with name "\1" emits string "\3". Testcase: "echo ^C" */
480#define SPECIAL_VAR_QUOTED_SVS 1
Eric Andersen25f27032001-04-26 23:22:31 +0000481
Denys Vlasenkocb6ff252009-05-04 00:14:30 +0200482struct variable;
483
Denis Vlasenkocc90f442009-04-08 16:40:34 +0000484static const char hush_version_str[] ALIGN1 = "HUSH_VERSION="BB_VER;
485
486/* This supports saving pointers malloced in vfork child,
Denis Vlasenkoc376db32009-04-15 21:49:48 +0000487 * to be freed in the parent.
Denis Vlasenkocc90f442009-04-08 16:40:34 +0000488 */
489#if !BB_MMU
490typedef struct nommu_save_t {
Denys Vlasenkocb6ff252009-05-04 00:14:30 +0200491 struct variable *old_vars;
Denis Vlasenkocc90f442009-04-08 16:40:34 +0000492 char **argv;
Denis Vlasenko27014ed2009-04-15 21:48:23 +0000493 char **argv_from_re_execing;
Denis Vlasenkocc90f442009-04-08 16:40:34 +0000494} nommu_save_t;
495#endif
496
Denys Vlasenko9b782552010-09-08 13:33:26 +0200497enum {
Eric Andersen25f27032001-04-26 23:22:31 +0000498 RES_NONE = 0,
Denis Vlasenko06810332007-05-21 23:30:54 +0000499#if ENABLE_HUSH_IF
Denis Vlasenko17f02e72008-07-14 04:32:29 +0000500 RES_IF ,
501 RES_THEN ,
502 RES_ELIF ,
503 RES_ELSE ,
504 RES_FI ,
Denis Vlasenko06810332007-05-21 23:30:54 +0000505#endif
506#if ENABLE_HUSH_LOOPS
Denis Vlasenko17f02e72008-07-14 04:32:29 +0000507 RES_FOR ,
508 RES_WHILE ,
509 RES_UNTIL ,
510 RES_DO ,
511 RES_DONE ,
Denis Vlasenkod91afa32008-07-29 11:10:01 +0000512#endif
513#if ENABLE_HUSH_LOOPS || ENABLE_HUSH_CASE
Denis Vlasenko17f02e72008-07-14 04:32:29 +0000514 RES_IN ,
Denis Vlasenko06810332007-05-21 23:30:54 +0000515#endif
Denis Vlasenko17f02e72008-07-14 04:32:29 +0000516#if ENABLE_HUSH_CASE
517 RES_CASE ,
Denys Vlasenkoe9bda902009-05-23 16:50:07 +0200518 /* three pseudo-keywords support contrived "case" syntax: */
519 RES_CASE_IN, /* "case ... IN", turns into RES_MATCH when IN is observed */
520 RES_MATCH , /* "word)" */
521 RES_CASE_BODY, /* "this command is inside CASE" */
Denis Vlasenko17f02e72008-07-14 04:32:29 +0000522 RES_ESAC ,
523#endif
524 RES_XXXX ,
525 RES_SNTX
Denys Vlasenko9b782552010-09-08 13:33:26 +0200526};
Denis Vlasenkoc7985b72008-06-17 05:43:38 +0000527
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +0000528typedef struct o_string {
529 char *data;
530 int length; /* position where data is appended */
531 int maxlen;
Denys Vlasenko5b686cb2010-09-08 13:44:34 +0200532 int o_expflags;
Denis Vlasenko02d6f1a2009-04-07 19:56:55 +0000533 /* At least some part of the string was inside '' or "",
534 * possibly empty one: word"", wo''rd etc. */
Denys Vlasenko38292b62010-09-05 14:49:40 +0200535 smallint has_quoted_part;
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +0000536 smallint has_empty_slot;
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +0000537} o_string;
538enum {
Denys Vlasenko0e13b402010-09-21 12:35:39 +0200539 EXP_FLAG_SINGLEWORD = 0x80, /* must be 0x80 */
540 EXP_FLAG_GLOB = 0x2,
541 /* Protect newly added chars against globbing
542 * by prepending \ to *, ?, [, \ */
543 EXP_FLAG_ESC_GLOB_CHARS = 0x1,
544};
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +0000545/* Used for initialization: o_string foo = NULL_O_STRING; */
546#define NULL_O_STRING { NULL }
547
Denys Vlasenko29f9b722011-05-14 11:27:36 +0200548#ifndef debug_printf_parse
549static const char *const assignment_flag[] = {
550 "MAYBE_ASSIGNMENT",
551 "DEFINITELY_ASSIGNMENT",
552 "NOT_ASSIGNMENT",
553 "WORD_IS_KEYWORD",
554};
555#endif
556
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +0000557typedef struct in_str {
558 const char *p;
Denys Vlasenkod17a91d2016-09-29 18:02:37 +0200559 int peek_buf[2];
Denys Vlasenkocecbc982011-03-30 18:54:52 +0200560 int last_char;
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +0000561 FILE *file;
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +0000562} in_str;
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +0000563
Denys Vlasenko764b2f02009-06-07 16:05:04 +0200564/* The descrip member of this structure is only used to make
565 * debugging output pretty */
566static const struct {
567 int mode;
568 signed char default_fd;
569 char descrip[3];
570} redir_table[] = {
571 { O_RDONLY, 0, "<" },
572 { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" },
573 { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" },
574 { O_CREAT|O_RDWR, 1, "<>" },
575 { O_RDONLY, 0, "<<" },
576/* Should not be needed. Bogus default_fd helps in debugging */
577/* { O_RDONLY, 77, "<<" }, */
578};
579
Eric Andersen25f27032001-04-26 23:22:31 +0000580struct redir_struct {
Denis Vlasenko55789c62008-06-18 16:30:42 +0000581 struct redir_struct *next;
Denis Vlasenko5ec61322008-06-24 00:50:07 +0000582 char *rd_filename; /* filename */
Denis Vlasenko02d6f1a2009-04-07 19:56:55 +0000583 int rd_fd; /* fd to redirect */
584 /* fd to redirect to, or -3 if rd_fd is to be closed (n>&-) */
585 int rd_dup;
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +0000586 smallint rd_type; /* (enum redir_type) */
587 /* note: for heredocs, rd_filename contains heredoc delimiter,
Denis Vlasenko02d6f1a2009-04-07 19:56:55 +0000588 * and subsequently heredoc itself; and rd_dup is a bitmask:
Denys Vlasenko764b2f02009-06-07 16:05:04 +0200589 * bit 0: do we need to trim leading tabs?
590 * bit 1: is heredoc quoted (<<'delim' syntax) ?
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +0000591 */
Eric Andersen25f27032001-04-26 23:22:31 +0000592};
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +0000593typedef enum redir_type {
Denys Vlasenko764b2f02009-06-07 16:05:04 +0200594 REDIRECT_INPUT = 0,
595 REDIRECT_OVERWRITE = 1,
596 REDIRECT_APPEND = 2,
597 REDIRECT_IO = 3,
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +0000598 REDIRECT_HEREDOC = 4,
Denys Vlasenko764b2f02009-06-07 16:05:04 +0200599 REDIRECT_HEREDOC2 = 5, /* REDIRECT_HEREDOC after heredoc is loaded */
Denis Vlasenkoc96865f2009-04-10 00:20:58 +0000600
601 REDIRFD_CLOSE = -3,
602 REDIRFD_SYNTAX_ERR = -2,
Denis Vlasenko835fcfd2009-04-10 13:51:56 +0000603 REDIRFD_TO_FILE = -1,
604 /* otherwise, rd_fd is redirected to rd_dup */
Denis Vlasenkoc96865f2009-04-10 00:20:58 +0000605
Denis Vlasenko02d6f1a2009-04-07 19:56:55 +0000606 HEREDOC_SKIPTABS = 1,
607 HEREDOC_QUOTED = 2,
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +0000608} redir_type;
609
Eric Andersen25f27032001-04-26 23:22:31 +0000610
Denis Vlasenko9af22c72008-10-09 12:54:58 +0000611struct command {
Denis Vlasenko0c886c62007-01-30 22:30:09 +0000612 pid_t pid; /* 0 if exited */
Denys Vlasenko21b7f1b2018-04-05 15:15:53 +0200613 unsigned assignment_cnt; /* how many argv[i] are assignments? */
Denys Vlasenko5807e182018-02-08 19:19:04 +0100614#if ENABLE_HUSH_LINENO_VAR
Denys Vlasenko6aad1dd2018-01-19 15:37:04 +0100615 unsigned lineno;
616#endif
Denys Vlasenko9d617c42009-06-09 18:40:52 +0200617 smallint cmd_type; /* CMD_xxx */
618#define CMD_NORMAL 0
619#define CMD_SUBSHELL 1
Denys Vlasenko11752d42018-04-03 08:20:58 +0200620#if BASH_TEST2 || ENABLE_HUSH_LOCAL || ENABLE_HUSH_EXPORT || ENABLE_HUSH_READONLY
621/* used for "[[ EXPR ]]", and to prevent word splitting and globbing in
622 * "export v=t*"
623 */
Denys Vlasenko9ca656b2009-06-10 13:39:35 +0200624# define CMD_SINGLEWORD_NOGLOB 2
Denis Vlasenkoed055212009-04-11 10:37:10 +0000625#endif
Denys Vlasenko9ca656b2009-06-10 13:39:35 +0200626#if ENABLE_HUSH_FUNCTIONS
627# define CMD_FUNCDEF 3
628#endif
629
Denys Vlasenko6696eac2010-11-14 02:01:50 +0100630 smalluint cmd_exitcode;
Denys Vlasenkocb6ff252009-05-04 00:14:30 +0200631 /* if non-NULL, this "command" is { list }, ( list ), or a compound statement */
632 struct pipe *group;
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +0000633#if !BB_MMU
634 char *group_as_string;
635#endif
Denis Vlasenkoed055212009-04-11 10:37:10 +0000636#if ENABLE_HUSH_FUNCTIONS
637 struct function *child_func;
638/* This field is used to prevent a bug here:
Denys Vlasenko9d617c42009-06-09 18:40:52 +0200639 * while...do f1() {a;}; f1; f1() {b;}; f1; done
Denis Vlasenkoed055212009-04-11 10:37:10 +0000640 * When we execute "f1() {a;}" cmd, we create new function and clear
641 * cmd->group, cmd->group_as_string, cmd->argv[0].
Denys Vlasenko9d617c42009-06-09 18:40:52 +0200642 * When we execute "f1() {b;}", we notice that f1 exists,
643 * and that its "parent cmd" struct is still "alive",
Denis Vlasenkoed055212009-04-11 10:37:10 +0000644 * we put those fields back into cmd->xxx
645 * (struct function has ->parent_cmd ptr to facilitate that).
646 * When we loop back, we can execute "f1() {a;}" again and set f1 correctly.
647 * Without this trick, loop would execute a;b;b;b;...
648 * instead of correct sequence a;b;a;b;...
649 * When command is freed, it severs the link
650 * (sets ->child_func->parent_cmd to NULL).
651 */
652#endif
Denis Vlasenko9af22c72008-10-09 12:54:58 +0000653 char **argv; /* command name and arguments */
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +0000654/* argv vector may contain variable references (^Cvar^C, ^C0^C etc)
655 * and on execution these are substituted with their values.
656 * Substitution can make _several_ words out of one argv[n]!
657 * Example: argv[0]=='.^C*^C.' here: echo .$*.
Denis Vlasenkoc7985b72008-06-17 05:43:38 +0000658 * References of the form ^C`cmd arg^C are `cmd arg` substitutions.
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +0000659 */
Denis Vlasenkoed055212009-04-11 10:37:10 +0000660 struct redir_struct *redirects; /* I/O redirections */
661};
Denis Vlasenkof8c1f022009-04-17 11:55:42 +0000662/* Is there anything in this command at all? */
663#define IS_NULL_CMD(cmd) \
664 (!(cmd)->group && !(cmd)->argv && !(cmd)->redirects)
665
Eric Andersen25f27032001-04-26 23:22:31 +0000666struct pipe {
Denis Vlasenkob81b3df2007-04-28 16:48:04 +0000667 struct pipe *next;
Denis Vlasenkob7d8c0d2009-04-10 19:05:43 +0000668 int num_cmds; /* total number of commands in pipe */
Denis Vlasenko9af22c72008-10-09 12:54:58 +0000669 int alive_cmds; /* number of commands running (not exited) */
670 int stopped_cmds; /* number of commands alive, but stopped */
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +0000671#if ENABLE_HUSH_JOB
Denys Vlasenkod5b5c2f2017-01-08 15:46:04 +0100672 unsigned jobid; /* job number */
Denis Vlasenko0c886c62007-01-30 22:30:09 +0000673 pid_t pgrp; /* process group ID for the job */
Denis Vlasenko219e88d2007-05-21 10:18:23 +0000674 char *cmdtext; /* name of job */
Denis Vlasenkob81b3df2007-04-28 16:48:04 +0000675#endif
Denis Vlasenko9af22c72008-10-09 12:54:58 +0000676 struct command *cmds; /* array of commands in pipe */
Denis Vlasenko219e88d2007-05-21 10:18:23 +0000677 smallint followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
Denis Vlasenko5ec61322008-06-24 00:50:07 +0000678 IF_HAS_KEYWORDS(smallint pi_inverted;) /* "! cmd | cmd" */
679 IF_HAS_KEYWORDS(smallint res_word;) /* needed for if, for, while, until... */
Eric Andersen25f27032001-04-26 23:22:31 +0000680};
Denis Vlasenkoa2b11e32009-04-06 14:11:13 +0000681typedef enum pipe_style {
Denys Vlasenko00a06b92016-11-08 20:35:53 +0100682 PIPE_SEQ = 0,
683 PIPE_AND = 1,
684 PIPE_OR = 2,
685 PIPE_BG = 3,
Denis Vlasenkoa2b11e32009-04-06 14:11:13 +0000686} pipe_style;
Denis Vlasenkof8c1f022009-04-17 11:55:42 +0000687/* Is there anything in this pipe at all? */
688#define IS_NULL_PIPE(pi) \
689 ((pi)->num_cmds == 0 IF_HAS_KEYWORDS( && (pi)->res_word == RES_NONE))
Eric Andersen25f27032001-04-26 23:22:31 +0000690
Denis Vlasenko9af22c72008-10-09 12:54:58 +0000691/* This holds pointers to the various results of parsing */
692struct parse_context {
Denis Vlasenkof9f74292009-04-03 00:07:05 +0000693 /* linked list of pipes */
Denis Vlasenko9af22c72008-10-09 12:54:58 +0000694 struct pipe *list_head;
Denis Vlasenkof9f74292009-04-03 00:07:05 +0000695 /* last pipe (being constructed right now) */
Denis Vlasenko9af22c72008-10-09 12:54:58 +0000696 struct pipe *pipe;
Denis Vlasenkof9f74292009-04-03 00:07:05 +0000697 /* last command in pipe (being constructed right now) */
698 struct command *command;
699 /* last redirect in command->redirects list */
Denis Vlasenko9af22c72008-10-09 12:54:58 +0000700 struct redir_struct *pending_redirect;
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +0200701 o_string word;
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +0000702#if !BB_MMU
703 o_string as_string;
704#endif
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +0200705 smallint is_assignment; /* 0:maybe, 1:yes, 2:no, 3:keyword */
Denis Vlasenko9af22c72008-10-09 12:54:58 +0000706#if HAS_KEYWORDS
707 smallint ctx_res_w;
708 smallint ctx_inverted; /* "! cmd | cmd" */
709#if ENABLE_HUSH_CASE
710 smallint ctx_dsemicolon; /* ";;" seen */
711#endif
Denis Vlasenkof9f74292009-04-03 00:07:05 +0000712 /* bitmask of FLAG_xxx, for figuring out valid reserved words */
713 int old_flag;
714 /* group we are enclosed in:
Denis Vlasenko34d4d892009-04-04 20:24:37 +0000715 * example: "if pipe1; pipe2; then pipe3; fi"
716 * when we see "if" or "then", we malloc and copy current context,
717 * and make ->stack point to it. then we parse pipeN.
718 * when closing "then" / fi" / whatever is found,
719 * we move list_head into ->stack->command->group,
720 * copy ->stack into current context, and delete ->stack.
721 * (parsing of { list } and ( list ) doesn't use this method)
Denis Vlasenkof9f74292009-04-03 00:07:05 +0000722 */
Denis Vlasenko9af22c72008-10-09 12:54:58 +0000723 struct parse_context *stack;
724#endif
725};
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +0200726enum {
727 MAYBE_ASSIGNMENT = 0,
728 DEFINITELY_ASSIGNMENT = 1,
729 NOT_ASSIGNMENT = 2,
730 /* Not an assignment, but next word may be: "if v=xyz cmd;" */
731 WORD_IS_KEYWORD = 3,
732};
Denis Vlasenko9af22c72008-10-09 12:54:58 +0000733
Denis Vlasenkod76c0492007-05-25 02:16:25 +0000734/* On program start, environ points to initial environment.
735 * putenv adds new pointers into it, unsetenv removes them.
736 * Neither of these (de)allocates the strings.
737 * setenv allocates new strings in malloc space and does putenv,
738 * and thus setenv is unusable (leaky) for shell's purposes */
739#define setenv(...) setenv_is_leaky_dont_use()
740struct variable {
741 struct variable *next;
Denis Vlasenko28c0f0f2007-05-25 02:46:01 +0000742 char *varstr; /* points to "name=" portion */
Denis Vlasenkod76c0492007-05-25 02:16:25 +0000743 int max_len; /* if > 0, name is part of initial env; else name is malloced */
Denys Vlasenko332e4112018-04-04 22:32:59 +0200744 uint16_t var_nest_level;
Denis Vlasenkod76c0492007-05-25 02:16:25 +0000745 smallint flg_export; /* putenv should be done on this var */
Denis Vlasenko219e88d2007-05-21 10:18:23 +0000746 smallint flg_read_only;
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000747};
748
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000749enum {
Denis Vlasenkobcb25532008-07-28 23:04:34 +0000750 BC_BREAK = 1,
751 BC_CONTINUE = 2,
752};
753
Denis Vlasenkoc0ea3292009-04-10 21:22:02 +0000754#if ENABLE_HUSH_FUNCTIONS
Denis Vlasenkob7d8c0d2009-04-10 19:05:43 +0000755struct function {
756 struct function *next;
757 char *name;
Denis Vlasenkoed055212009-04-11 10:37:10 +0000758 struct command *parent_cmd;
Denis Vlasenkob7d8c0d2009-04-10 19:05:43 +0000759 struct pipe *body;
Denys Vlasenkoc1947f12009-10-23 01:30:26 +0200760# if !BB_MMU
Denis Vlasenkoc0ea3292009-04-10 21:22:02 +0000761 char *body_as_string;
Denys Vlasenkoc1947f12009-10-23 01:30:26 +0200762# endif
Denis Vlasenkob7d8c0d2009-04-10 19:05:43 +0000763};
Denis Vlasenkoc0ea3292009-04-10 21:22:02 +0000764#endif
Denis Vlasenkob7d8c0d2009-04-10 19:05:43 +0000765
Denis Vlasenkod76c0492007-05-25 02:16:25 +0000766
Denys Vlasenko6696eac2010-11-14 02:01:50 +0100767/* set -/+o OPT support. (TODO: make it optional)
768 * bash supports the following opts:
769 * allexport off
770 * braceexpand on
771 * emacs on
772 * errexit off
773 * errtrace off
774 * functrace off
775 * hashall on
776 * histexpand off
777 * history on
778 * ignoreeof off
779 * interactive-comments on
780 * keyword off
781 * monitor on
782 * noclobber off
783 * noexec off
784 * noglob off
785 * nolog off
786 * notify off
787 * nounset off
788 * onecmd off
789 * physical off
790 * pipefail off
791 * posix off
792 * privileged off
793 * verbose off
794 * vi off
795 * xtrace off
796 */
Dan Fandrich85c62472010-11-20 13:05:17 -0800797static const char o_opt_strings[] ALIGN1 =
798 "pipefail\0"
799 "noexec\0"
Denys Vlasenko9fda6092017-07-14 13:36:48 +0200800 "errexit\0"
Dan Fandrich85c62472010-11-20 13:05:17 -0800801#if ENABLE_HUSH_MODE_X
802 "xtrace\0"
803#endif
804 ;
Denys Vlasenko6696eac2010-11-14 02:01:50 +0100805enum {
806 OPT_O_PIPEFAIL,
Dan Fandrich85c62472010-11-20 13:05:17 -0800807 OPT_O_NOEXEC,
Denys Vlasenko9fda6092017-07-14 13:36:48 +0200808 OPT_O_ERREXIT,
Dan Fandrich85c62472010-11-20 13:05:17 -0800809#if ENABLE_HUSH_MODE_X
810 OPT_O_XTRACE,
811#endif
Denys Vlasenko6696eac2010-11-14 02:01:50 +0100812 NUM_OPT_O
813};
814
815
Denys Vlasenko7b25b1c2016-08-20 15:58:34 +0200816struct FILE_list {
817 struct FILE_list *next;
818 FILE *fp;
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +0200819 int fd;
Denys Vlasenko7b25b1c2016-08-20 15:58:34 +0200820};
821
822
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000823/* "Globals" within this file */
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000824/* Sorted roughly by size (smaller offsets == smaller code) */
825struct globals {
Denis Vlasenkoc8653f62009-04-27 23:29:14 +0000826 /* interactive_fd != 0 means we are an interactive shell.
827 * If we are, then saved_tty_pgrp can also be != 0, meaning
828 * that controlling tty is available. With saved_tty_pgrp == 0,
829 * job control still works, but terminal signals
830 * (^C, ^Z, ^Y, ^\) won't work at all, and background
831 * process groups can only be created with "cmd &".
832 * With saved_tty_pgrp != 0, hush will use tcsetpgrp()
833 * to give tty to the foreground process group,
834 * and will take it back when the group is stopped (^Z)
835 * or killed (^C).
836 */
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000837#if ENABLE_HUSH_INTERACTIVE
838 /* 'interactive_fd' is a fd# open to ctty, if we have one
839 * _AND_ if we decided to act interactively */
840 int interactive_fd;
841 const char *PS1;
Denys Vlasenkof5018da2018-04-06 17:58:21 +0200842 IF_FEATURE_EDITING_FANCY_PROMPT(const char *PS2;)
Denis Vlasenkoc8653f62009-04-27 23:29:14 +0000843# define G_interactive_fd (G.interactive_fd)
Denis Vlasenko60b392f2009-04-03 19:14:32 +0000844#else
Denis Vlasenkoc8653f62009-04-27 23:29:14 +0000845# define G_interactive_fd 0
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000846#endif
847#if ENABLE_FEATURE_EDITING
848 line_input_t *line_input_state;
849#endif
Denis Vlasenkocc3f20b2008-06-23 22:31:52 +0000850 pid_t root_pid;
Denys Vlasenkodea47882009-10-09 15:40:49 +0200851 pid_t root_ppid;
Denis Vlasenko87a86552008-07-29 19:43:10 +0000852 pid_t last_bg_pid;
Denys Vlasenko20b3d142009-10-09 20:59:39 +0200853#if ENABLE_HUSH_RANDOM_SUPPORT
854 random_t random_gen;
855#endif
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000856#if ENABLE_HUSH_JOB
857 int run_list_level;
Denys Vlasenkod5b5c2f2017-01-08 15:46:04 +0100858 unsigned last_jobid;
Denis Vlasenkoc8653f62009-04-27 23:29:14 +0000859 pid_t saved_tty_pgrp;
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000860 struct pipe *job_list;
Mike Frysinger38478a62009-05-20 04:48:06 -0400861# define G_saved_tty_pgrp (G.saved_tty_pgrp)
862#else
863# define G_saved_tty_pgrp 0
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000864#endif
Denys Vlasenko9fda6092017-07-14 13:36:48 +0200865 /* How deeply are we in context where "set -e" is ignored */
866 int errexit_depth;
867 /* "set -e" rules (do we follow them correctly?):
868 * Exit if pipe, list, or compound command exits with a non-zero status.
869 * Shell does not exit if failed command is part of condition in
870 * if/while, part of && or || list except the last command, any command
871 * in a pipe but the last, or if the command's return value is being
872 * inverted with !. If a compound command other than a subshell returns a
873 * non-zero status because a command failed while -e was being ignored, the
874 * shell does not exit. A trap on ERR, if set, is executed before the shell
875 * exits [ERR is a bashism].
876 *
877 * If a compound command or function executes in a context where -e is
878 * ignored, none of the commands executed within are affected by the -e
879 * setting. If a compound command or function sets -e while executing in a
880 * context where -e is ignored, that setting does not have any effect until
881 * the compound command or the command containing the function call completes.
882 */
883
Denys Vlasenko26777aa2010-11-22 23:49:10 +0100884 char o_opt[NUM_OPT_O];
Denys Vlasenko57542eb2010-11-28 03:59:30 +0100885#if ENABLE_HUSH_MODE_X
886# define G_x_mode (G.o_opt[OPT_O_XTRACE])
887#else
888# define G_x_mode 0
889#endif
Denys Vlasenko8d6eab32018-04-07 17:01:31 +0200890#if ENABLE_HUSH_INTERACTIVE
891 smallint promptmode; /* 0: PS1, 1: PS2 */
892#endif
Denis Vlasenko422cd7c2009-03-31 12:41:52 +0000893 smallint flag_SIGINT;
Denis Vlasenkodadfb492008-07-29 10:16:05 +0000894#if ENABLE_HUSH_LOOPS
Denis Vlasenkobcb25532008-07-28 23:04:34 +0000895 smallint flag_break_continue;
Denis Vlasenkodadfb492008-07-29 10:16:05 +0000896#endif
Denis Vlasenko3d40d8e2009-04-17 23:44:18 +0000897#if ENABLE_HUSH_FUNCTIONS
898 /* 0: outside of a function (or sourced file)
899 * -1: inside of a function, ok to use return builtin
Denis Vlasenkoc8653f62009-04-27 23:29:14 +0000900 * 1: return is invoked, skip all till end of func
Denis Vlasenko3d40d8e2009-04-17 23:44:18 +0000901 */
902 smallint flag_return_in_progress;
Denys Vlasenko04b46bc2016-10-01 22:28:03 +0200903# define G_flag_return_in_progress (G.flag_return_in_progress)
904#else
905# define G_flag_return_in_progress 0
Denis Vlasenko3d40d8e2009-04-17 23:44:18 +0000906#endif
Denis Vlasenkoefea9d22009-04-09 13:43:11 +0000907 smallint exiting; /* used to prevent EXIT trap recursion */
Denys Vlasenko5fa05052018-04-03 11:21:13 +0200908 /* These support $?, $#, and $1 */
Denis Vlasenkoab2b0642009-04-06 18:42:11 +0000909 smalluint last_exitcode;
Denys Vlasenko5fa05052018-04-03 11:21:13 +0200910 smalluint expand_exitcode;
Denys Vlasenko840a4352017-07-07 22:56:02 +0200911 smalluint last_bg_pid_exitcode;
Denys Vlasenko4e4f88e2017-01-09 07:57:38 +0100912#if ENABLE_HUSH_SET
Denis Vlasenkocc4c6932009-04-05 07:38:48 +0000913 /* are global_argv and global_argv[1..n] malloced? (note: not [0]) */
Denis Vlasenko11fb7cf2009-03-20 10:13:08 +0000914 smalluint global_args_malloced;
Denys Vlasenko4e4f88e2017-01-09 07:57:38 +0100915# define G_global_args_malloced (G.global_args_malloced)
916#else
917# define G_global_args_malloced 0
918#endif
Denis Vlasenkoe1300f62009-03-22 11:41:18 +0000919 /* how many non-NULL argv's we have. NB: $# + 1 */
920 int global_argc;
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000921 char **global_argv;
Denis Vlasenkocc4c6932009-04-05 07:38:48 +0000922#if !BB_MMU
Denis Vlasenko46f9b6d2009-04-05 10:39:03 +0000923 char *argv0_for_re_execing;
Denis Vlasenkocc4c6932009-04-05 07:38:48 +0000924#endif
Denis Vlasenkodadfb492008-07-29 10:16:05 +0000925#if ENABLE_HUSH_LOOPS
Denis Vlasenko6a2d40f2008-07-28 23:07:06 +0000926 unsigned depth_break_continue;
Denis Vlasenkofcf37c32008-07-29 11:37:15 +0000927 unsigned depth_of_loop;
Denis Vlasenkodadfb492008-07-29 10:16:05 +0000928#endif
Denys Vlasenko238ff982017-08-29 13:38:30 +0200929#if ENABLE_HUSH_GETOPTS
930 unsigned getopt_count;
931#endif
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000932 const char *ifs;
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000933 const char *cwd;
Denys Vlasenko52e460b2010-09-16 16:12:00 +0200934 struct variable *top_var;
Denys Vlasenko29082232010-07-16 13:52:32 +0200935 char **expanded_assignments;
Denys Vlasenko295fef82009-06-03 12:47:26 +0200936 struct variable **shadowed_vars_pp;
Denys Vlasenko332e4112018-04-04 22:32:59 +0200937 unsigned var_nest_level;
938#if ENABLE_HUSH_FUNCTIONS
939# if ENABLE_HUSH_LOCAL
940 unsigned func_nest_level; /* solely to prevent "local v" in non-functions */
Denys Vlasenko295fef82009-06-03 12:47:26 +0200941# endif
Denys Vlasenko332e4112018-04-04 22:32:59 +0200942 struct function *top_func;
Denis Vlasenkoc0ea3292009-04-10 21:22:02 +0000943#endif
Denis Vlasenkod5762932009-03-31 11:22:57 +0000944 /* Signal and trap handling */
Denys Vlasenko8d7be232009-05-25 16:38:32 +0200945#if ENABLE_HUSH_FAST
946 unsigned count_SIGCHLD;
947 unsigned handled_SIGCHLD;
Denys Vlasenkoe2df5f42009-05-26 14:34:10 +0200948 smallint we_have_children;
Denys Vlasenko8d7be232009-05-25 16:38:32 +0200949#endif
Denys Vlasenko5807e182018-02-08 19:19:04 +0100950#if ENABLE_HUSH_LINENO_VAR
Denys Vlasenko6aad1dd2018-01-19 15:37:04 +0100951 unsigned lineno;
952 char *lineno_var;
Denys Vlasenko6aad1dd2018-01-19 15:37:04 +0100953#endif
Denys Vlasenko7b25b1c2016-08-20 15:58:34 +0200954 struct FILE_list *FILE_list;
Denys Vlasenko10c01312011-05-11 11:49:21 +0200955 /* Which signals have non-DFL handler (even with no traps set)?
956 * Set at the start to:
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +0200957 * (SIGQUIT + maybe SPECIAL_INTERACTIVE_SIGS + maybe SPECIAL_JOBSTOP_SIGS)
Denys Vlasenko10c01312011-05-11 11:49:21 +0200958 * SPECIAL_INTERACTIVE_SIGS are cleared after fork.
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +0200959 * The rest is cleared right before execv syscalls.
Denys Vlasenko10c01312011-05-11 11:49:21 +0200960 * Other than these two times, never modified.
961 */
962 unsigned special_sig_mask;
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +0200963#if ENABLE_HUSH_JOB
964 unsigned fatal_sig_mask;
Denys Vlasenko4e4f88e2017-01-09 07:57:38 +0100965# define G_fatal_sig_mask (G.fatal_sig_mask)
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +0200966#else
Denys Vlasenko75e77de2011-05-12 13:12:47 +0200967# define G_fatal_sig_mask 0
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +0200968#endif
Denys Vlasenko7a85c602017-01-08 17:40:18 +0100969#if ENABLE_HUSH_TRAP
Denis Vlasenko7566bae2009-03-31 17:24:49 +0000970 char **traps; /* char *traps[NSIG] */
Denys Vlasenko7a85c602017-01-08 17:40:18 +0100971# define G_traps G.traps
972#else
973# define G_traps ((char**)NULL)
974#endif
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +0200975 sigset_t pending_set;
Denys Vlasenko44719692017-01-08 18:44:41 +0100976#if ENABLE_HUSH_MEMLEAK
Denis Vlasenkoc73b70c2009-04-08 11:48:57 +0000977 unsigned long memleak_value;
Denys Vlasenko44719692017-01-08 18:44:41 +0100978#endif
979#if HUSH_DEBUG
Denis Vlasenko0701dca2009-04-11 10:38:47 +0000980 int debug_indent;
Denis Vlasenkoc73b70c2009-04-08 11:48:57 +0000981#endif
Denys Vlasenko0806e402011-05-12 23:06:20 +0200982 struct sigaction sa;
Denys Vlasenko0448c552016-09-29 20:25:44 +0200983#if ENABLE_FEATURE_EDITING
984 char user_input_buf[CONFIG_FEATURE_EDITING_MAX_LEN];
985#endif
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000986};
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000987#define G (*ptr_to_globals)
Denis Vlasenko87a86552008-07-29 19:43:10 +0000988/* Not #defining name to G.name - this quickly gets unwieldy
989 * (too many defines). Also, I actually prefer to see when a variable
990 * is global, thus "G." prefix is a useful hint */
Denis Vlasenko574f2f42008-02-27 18:41:59 +0000991#define INIT_G() do { \
992 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
Denys Vlasenko0806e402011-05-12 23:06:20 +0200993 /* memset(&G.sa, 0, sizeof(G.sa)); */ \
994 sigfillset(&G.sa.sa_mask); \
995 G.sa.sa_flags = SA_RESTART; \
Denis Vlasenko574f2f42008-02-27 18:41:59 +0000996} while (0)
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000997
998
Denis Vlasenko424f79b2009-03-22 14:23:34 +0000999/* Function prototypes for builtins */
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001000static int builtin_cd(char **argv) FAST_FUNC;
Denys Vlasenko1cc68042017-01-09 17:10:04 +01001001#if ENABLE_HUSH_ECHO
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001002static int builtin_echo(char **argv) FAST_FUNC;
Denys Vlasenko1cc68042017-01-09 17:10:04 +01001003#endif
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001004static int builtin_eval(char **argv) FAST_FUNC;
1005static int builtin_exec(char **argv) FAST_FUNC;
1006static int builtin_exit(char **argv) FAST_FUNC;
Denys Vlasenko6ec76d82017-01-08 18:40:41 +01001007#if ENABLE_HUSH_EXPORT
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001008static int builtin_export(char **argv) FAST_FUNC;
Denys Vlasenko6ec76d82017-01-08 18:40:41 +01001009#endif
Denys Vlasenko1e660422017-07-17 21:10:50 +02001010#if ENABLE_HUSH_READONLY
1011static int builtin_readonly(char **argv) FAST_FUNC;
1012#endif
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001013#if ENABLE_HUSH_JOB
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001014static int builtin_fg_bg(char **argv) FAST_FUNC;
1015static int builtin_jobs(char **argv) FAST_FUNC;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001016#endif
Denys Vlasenko74d40582017-08-11 01:32:46 +02001017#if ENABLE_HUSH_GETOPTS
1018static int builtin_getopts(char **argv) FAST_FUNC;
1019#endif
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001020#if ENABLE_HUSH_HELP
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001021static int builtin_help(char **argv) FAST_FUNC;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001022#endif
Denys Vlasenkoff463a82013-05-12 02:45:23 +02001023#if MAX_HISTORY && ENABLE_FEATURE_EDITING
Flemming Madsend96ffda2013-04-07 18:47:24 +02001024static int builtin_history(char **argv) FAST_FUNC;
1025#endif
Denys Vlasenko295fef82009-06-03 12:47:26 +02001026#if ENABLE_HUSH_LOCAL
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001027static int builtin_local(char **argv) FAST_FUNC;
Denys Vlasenko295fef82009-06-03 12:47:26 +02001028#endif
Denys Vlasenko44719692017-01-08 18:44:41 +01001029#if ENABLE_HUSH_MEMLEAK
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001030static int builtin_memleak(char **argv) FAST_FUNC;
Denis Vlasenkoc73b70c2009-04-08 11:48:57 +00001031#endif
Denys Vlasenko1125d7d2017-01-08 17:19:38 +01001032#if ENABLE_HUSH_PRINTF
Mike Frysinger4ebc76c2009-10-15 03:32:39 -04001033static int builtin_printf(char **argv) FAST_FUNC;
1034#endif
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001035static int builtin_pwd(char **argv) FAST_FUNC;
Denys Vlasenko7a85c602017-01-08 17:40:18 +01001036#if ENABLE_HUSH_READ
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001037static int builtin_read(char **argv) FAST_FUNC;
Denys Vlasenko7a85c602017-01-08 17:40:18 +01001038#endif
Denys Vlasenko10d5ece2017-01-08 18:28:43 +01001039#if ENABLE_HUSH_SET
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001040static int builtin_set(char **argv) FAST_FUNC;
Denys Vlasenko10d5ece2017-01-08 18:28:43 +01001041#endif
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001042static int builtin_shift(char **argv) FAST_FUNC;
1043static int builtin_source(char **argv) FAST_FUNC;
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01001044#if ENABLE_HUSH_TEST || BASH_TEST2
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001045static int builtin_test(char **argv) FAST_FUNC;
Denys Vlasenko265062d2017-01-10 15:13:30 +01001046#endif
Denys Vlasenko7a85c602017-01-08 17:40:18 +01001047#if ENABLE_HUSH_TRAP
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001048static int builtin_trap(char **argv) FAST_FUNC;
Denys Vlasenko7a85c602017-01-08 17:40:18 +01001049#endif
Denys Vlasenko1125d7d2017-01-08 17:19:38 +01001050#if ENABLE_HUSH_TYPE
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001051static int builtin_type(char **argv) FAST_FUNC;
Denys Vlasenko1125d7d2017-01-08 17:19:38 +01001052#endif
Denys Vlasenko11f2e992017-08-10 16:34:03 +02001053#if ENABLE_HUSH_TIMES
1054static int builtin_times(char **argv) FAST_FUNC;
1055#endif
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001056static int builtin_true(char **argv) FAST_FUNC;
Denys Vlasenkod5933b12017-01-08 18:31:39 +01001057#if ENABLE_HUSH_UMASK
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001058static int builtin_umask(char **argv) FAST_FUNC;
Denys Vlasenkod5933b12017-01-08 18:31:39 +01001059#endif
Denys Vlasenko10d5ece2017-01-08 18:28:43 +01001060#if ENABLE_HUSH_UNSET
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001061static int builtin_unset(char **argv) FAST_FUNC;
Denys Vlasenko10d5ece2017-01-08 18:28:43 +01001062#endif
Denys Vlasenko1125d7d2017-01-08 17:19:38 +01001063#if ENABLE_HUSH_KILL
1064static int builtin_kill(char **argv) FAST_FUNC;
1065#endif
1066#if ENABLE_HUSH_WAIT
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001067static int builtin_wait(char **argv) FAST_FUNC;
Denys Vlasenko1125d7d2017-01-08 17:19:38 +01001068#endif
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001069#if ENABLE_HUSH_LOOPS
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001070static int builtin_break(char **argv) FAST_FUNC;
1071static int builtin_continue(char **argv) FAST_FUNC;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001072#endif
Denis Vlasenko3d40d8e2009-04-17 23:44:18 +00001073#if ENABLE_HUSH_FUNCTIONS
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001074static int builtin_return(char **argv) FAST_FUNC;
Denis Vlasenko3d40d8e2009-04-17 23:44:18 +00001075#endif
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001076
1077/* Table of built-in functions. They can be forked or not, depending on
1078 * context: within pipes, they fork. As simple commands, they do not.
1079 * When used in non-forking context, they can change global variables
1080 * in the parent shell process. If forked, of course they cannot.
1081 * For example, 'unset foo | whatever' will parse and run, but foo will
1082 * still be set at the end. */
1083struct built_in_command {
Denys Vlasenko17323a62010-01-28 01:57:05 +01001084 const char *b_cmd;
1085 int (*b_function)(char **argv) FAST_FUNC;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001086#if ENABLE_HUSH_HELP
Denys Vlasenko17323a62010-01-28 01:57:05 +01001087 const char *b_descr;
Denys Vlasenko28a105d2009-06-01 11:26:30 +02001088# define BLTIN(cmd, func, help) { cmd, func, help }
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001089#else
Denys Vlasenko28a105d2009-06-01 11:26:30 +02001090# define BLTIN(cmd, func, help) { cmd, func }
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001091#endif
1092};
1093
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001094static const struct built_in_command bltins1[] = {
Denys Vlasenko80f806c2017-01-10 16:51:10 +01001095 BLTIN("." , builtin_source , "Run commands in file"),
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001096 BLTIN(":" , builtin_true , NULL),
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001097#if ENABLE_HUSH_JOB
Denys Vlasenko80f806c2017-01-10 16:51:10 +01001098 BLTIN("bg" , builtin_fg_bg , "Resume job in background"),
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001099#endif
1100#if ENABLE_HUSH_LOOPS
Denys Vlasenko80f806c2017-01-10 16:51:10 +01001101 BLTIN("break" , builtin_break , "Exit loop"),
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001102#endif
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001103 BLTIN("cd" , builtin_cd , "Change directory"),
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001104#if ENABLE_HUSH_LOOPS
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001105 BLTIN("continue" , builtin_continue, "Start new loop iteration"),
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001106#endif
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001107 BLTIN("eval" , builtin_eval , "Construct and run shell command"),
1108 BLTIN("exec" , builtin_exec , "Execute command, don't return to shell"),
Denys Vlasenko80f806c2017-01-10 16:51:10 +01001109 BLTIN("exit" , builtin_exit , NULL),
Denys Vlasenko6ec76d82017-01-08 18:40:41 +01001110#if ENABLE_HUSH_EXPORT
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001111 BLTIN("export" , builtin_export , "Set environment variables"),
Denys Vlasenko6ec76d82017-01-08 18:40:41 +01001112#endif
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001113#if ENABLE_HUSH_JOB
Denys Vlasenkod2c15bc2017-07-18 18:14:42 +02001114 BLTIN("fg" , builtin_fg_bg , "Bring job to foreground"),
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001115#endif
Denys Vlasenko74d40582017-08-11 01:32:46 +02001116#if ENABLE_HUSH_GETOPTS
1117 BLTIN("getopts" , builtin_getopts , NULL),
1118#endif
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001119#if ENABLE_HUSH_HELP
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001120 BLTIN("help" , builtin_help , NULL),
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001121#endif
Denys Vlasenkoff463a82013-05-12 02:45:23 +02001122#if MAX_HISTORY && ENABLE_FEATURE_EDITING
Denys Vlasenko80f806c2017-01-10 16:51:10 +01001123 BLTIN("history" , builtin_history , "Show history"),
Flemming Madsend96ffda2013-04-07 18:47:24 +02001124#endif
Denis Vlasenko34d4d892009-04-04 20:24:37 +00001125#if ENABLE_HUSH_JOB
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001126 BLTIN("jobs" , builtin_jobs , "List jobs"),
Denis Vlasenko34d4d892009-04-04 20:24:37 +00001127#endif
Denys Vlasenko1125d7d2017-01-08 17:19:38 +01001128#if ENABLE_HUSH_KILL
1129 BLTIN("kill" , builtin_kill , "Send signals to processes"),
1130#endif
Denys Vlasenko295fef82009-06-03 12:47:26 +02001131#if ENABLE_HUSH_LOCAL
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001132 BLTIN("local" , builtin_local , "Set local variables"),
Denys Vlasenko295fef82009-06-03 12:47:26 +02001133#endif
Denys Vlasenko44719692017-01-08 18:44:41 +01001134#if ENABLE_HUSH_MEMLEAK
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001135 BLTIN("memleak" , builtin_memleak , NULL),
Denis Vlasenkoc73b70c2009-04-08 11:48:57 +00001136#endif
Denys Vlasenko7a85c602017-01-08 17:40:18 +01001137#if ENABLE_HUSH_READ
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001138 BLTIN("read" , builtin_read , "Input into variable"),
Denys Vlasenko7a85c602017-01-08 17:40:18 +01001139#endif
Denys Vlasenko1e660422017-07-17 21:10:50 +02001140#if ENABLE_HUSH_READONLY
1141 BLTIN("readonly" , builtin_readonly, "Make variables read-only"),
1142#endif
Denis Vlasenko3d40d8e2009-04-17 23:44:18 +00001143#if ENABLE_HUSH_FUNCTIONS
Denys Vlasenko80f806c2017-01-10 16:51:10 +01001144 BLTIN("return" , builtin_return , "Return from function"),
Denis Vlasenko3d40d8e2009-04-17 23:44:18 +00001145#endif
Denys Vlasenko10d5ece2017-01-08 18:28:43 +01001146#if ENABLE_HUSH_SET
Denys Vlasenko80f806c2017-01-10 16:51:10 +01001147 BLTIN("set" , builtin_set , "Set positional parameters"),
Denys Vlasenko10d5ece2017-01-08 18:28:43 +01001148#endif
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001149 BLTIN("shift" , builtin_shift , "Shift positional parameters"),
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01001150#if BASH_SOURCE
Denys Vlasenko80f806c2017-01-10 16:51:10 +01001151 BLTIN("source" , builtin_source , NULL),
Denys Vlasenko82731b42010-05-17 17:49:52 +02001152#endif
Denys Vlasenko11f2e992017-08-10 16:34:03 +02001153#if ENABLE_HUSH_TIMES
1154 BLTIN("times" , builtin_times , NULL),
1155#endif
Denys Vlasenko7a85c602017-01-08 17:40:18 +01001156#if ENABLE_HUSH_TRAP
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001157 BLTIN("trap" , builtin_trap , "Trap signals"),
Denys Vlasenko7a85c602017-01-08 17:40:18 +01001158#endif
Denys Vlasenko2bba5912014-03-14 12:43:57 +01001159 BLTIN("true" , builtin_true , NULL),
Denys Vlasenko1125d7d2017-01-08 17:19:38 +01001160#if ENABLE_HUSH_TYPE
Denys Vlasenko651a2692010-03-23 16:25:17 +01001161 BLTIN("type" , builtin_type , "Show command type"),
Denys Vlasenko1125d7d2017-01-08 17:19:38 +01001162#endif
Denys Vlasenko7a85c602017-01-08 17:40:18 +01001163#if ENABLE_HUSH_ULIMIT
Denys Vlasenko10d5ece2017-01-08 18:28:43 +01001164 BLTIN("ulimit" , shell_builtin_ulimit, "Control resource limits"),
Denys Vlasenko7a85c602017-01-08 17:40:18 +01001165#endif
Denys Vlasenkod5933b12017-01-08 18:31:39 +01001166#if ENABLE_HUSH_UMASK
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001167 BLTIN("umask" , builtin_umask , "Set file creation mask"),
Denys Vlasenkod5933b12017-01-08 18:31:39 +01001168#endif
Denys Vlasenko10d5ece2017-01-08 18:28:43 +01001169#if ENABLE_HUSH_UNSET
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001170 BLTIN("unset" , builtin_unset , "Unset variables"),
Denys Vlasenko10d5ece2017-01-08 18:28:43 +01001171#endif
Denys Vlasenko1125d7d2017-01-08 17:19:38 +01001172#if ENABLE_HUSH_WAIT
Denys Vlasenkod2c15bc2017-07-18 18:14:42 +02001173 BLTIN("wait" , builtin_wait , "Wait for process to finish"),
Denys Vlasenko1125d7d2017-01-08 17:19:38 +01001174#endif
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001175};
Denys Vlasenko80f806c2017-01-10 16:51:10 +01001176/* These builtins won't be used if we are on NOMMU and need to re-exec
1177 * (it's cheaper to run an external program in this case):
1178 */
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001179static const struct built_in_command bltins2[] = {
Denys Vlasenko265062d2017-01-10 15:13:30 +01001180#if ENABLE_HUSH_TEST
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001181 BLTIN("[" , builtin_test , NULL),
Denys Vlasenko265062d2017-01-10 15:13:30 +01001182#endif
Denys Vlasenko8944c672017-01-11 14:22:00 +01001183#if BASH_TEST2
1184 BLTIN("[[" , builtin_test , NULL),
1185#endif
Denys Vlasenko1cc68042017-01-09 17:10:04 +01001186#if ENABLE_HUSH_ECHO
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001187 BLTIN("echo" , builtin_echo , NULL),
Denys Vlasenko1cc68042017-01-09 17:10:04 +01001188#endif
Denys Vlasenko1125d7d2017-01-08 17:19:38 +01001189#if ENABLE_HUSH_PRINTF
Mike Frysinger4ebc76c2009-10-15 03:32:39 -04001190 BLTIN("printf" , builtin_printf , NULL),
1191#endif
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001192 BLTIN("pwd" , builtin_pwd , NULL),
Denys Vlasenko265062d2017-01-10 15:13:30 +01001193#if ENABLE_HUSH_TEST
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001194 BLTIN("test" , builtin_test , NULL),
Denys Vlasenko265062d2017-01-10 15:13:30 +01001195#endif
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001196};
1197
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +00001198
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001199/* Debug printouts.
1200 */
1201#if HUSH_DEBUG
1202/* prevent disasters with G.debug_indent < 0 */
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01001203# define indent() fdprintf(2, "%*s", (G.debug_indent * 2) & 0xff, "")
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001204# define debug_enter() (G.debug_indent++)
1205# define debug_leave() (G.debug_indent--)
1206#else
Denys Vlasenko28a105d2009-06-01 11:26:30 +02001207# define indent() ((void)0)
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001208# define debug_enter() ((void)0)
1209# define debug_leave() ((void)0)
1210#endif
1211
1212#ifndef debug_printf
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01001213# define debug_printf(...) (indent(), fdprintf(2, __VA_ARGS__))
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001214#endif
1215
1216#ifndef debug_printf_parse
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01001217# define debug_printf_parse(...) (indent(), fdprintf(2, __VA_ARGS__))
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001218#endif
1219
1220#ifndef debug_printf_exec
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01001221#define debug_printf_exec(...) (indent(), fdprintf(2, __VA_ARGS__))
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001222#endif
1223
1224#ifndef debug_printf_env
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01001225# define debug_printf_env(...) (indent(), fdprintf(2, __VA_ARGS__))
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001226#endif
1227
1228#ifndef debug_printf_jobs
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01001229# define debug_printf_jobs(...) (indent(), fdprintf(2, __VA_ARGS__))
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001230# define DEBUG_JOBS 1
1231#else
1232# define DEBUG_JOBS 0
1233#endif
1234
1235#ifndef debug_printf_expand
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01001236# define debug_printf_expand(...) (indent(), fdprintf(2, __VA_ARGS__))
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001237# define DEBUG_EXPAND 1
1238#else
1239# define DEBUG_EXPAND 0
1240#endif
1241
Denys Vlasenko1e811b12010-05-22 03:12:29 +02001242#ifndef debug_printf_varexp
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01001243# define debug_printf_varexp(...) (indent(), fdprintf(2, __VA_ARGS__))
Denys Vlasenko1e811b12010-05-22 03:12:29 +02001244#endif
1245
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001246#ifndef debug_printf_glob
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01001247# define debug_printf_glob(...) (indent(), fdprintf(2, __VA_ARGS__))
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001248# define DEBUG_GLOB 1
1249#else
1250# define DEBUG_GLOB 0
1251#endif
1252
Denys Vlasenko2db74612017-07-07 22:07:28 +02001253#ifndef debug_printf_redir
1254# define debug_printf_redir(...) (indent(), fdprintf(2, __VA_ARGS__))
1255#endif
1256
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001257#ifndef debug_printf_list
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01001258# define debug_printf_list(...) (indent(), fdprintf(2, __VA_ARGS__))
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001259#endif
1260
1261#ifndef debug_printf_subst
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01001262# define debug_printf_subst(...) (indent(), fdprintf(2, __VA_ARGS__))
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001263#endif
1264
Denys Vlasenko8d6eab32018-04-07 17:01:31 +02001265#ifndef debug_printf_prompt
1266# define debug_printf_prompt(...) (indent(), fdprintf(2, __VA_ARGS__))
1267#endif
1268
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001269#ifndef debug_printf_clean
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01001270# define debug_printf_clean(...) (indent(), fdprintf(2, __VA_ARGS__))
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001271# define DEBUG_CLEAN 1
1272#else
1273# define DEBUG_CLEAN 0
1274#endif
1275
1276#if DEBUG_EXPAND
1277static void debug_print_strings(const char *prefix, char **vv)
1278{
1279 indent();
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01001280 fdprintf(2, "%s:\n", prefix);
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001281 while (*vv)
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01001282 fdprintf(2, " '%s'\n", *vv++);
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001283}
1284#else
Denys Vlasenko28a105d2009-06-01 11:26:30 +02001285# define debug_print_strings(prefix, vv) ((void)0)
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001286#endif
1287
1288
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001289/* Leak hunting. Use hush_leaktool.sh for post-processing.
1290 */
1291#if LEAK_HUNTING
1292static void *xxmalloc(int lineno, size_t size)
Denis Vlasenko90e485c2007-05-23 15:22:50 +00001293{
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001294 void *ptr = xmalloc((size + 0xff) & ~0xff);
1295 fdprintf(2, "line %d: malloc %p\n", lineno, ptr);
1296 return ptr;
1297}
1298static void *xxrealloc(int lineno, void *ptr, size_t size)
1299{
1300 ptr = xrealloc(ptr, (size + 0xff) & ~0xff);
1301 fdprintf(2, "line %d: realloc %p\n", lineno, ptr);
1302 return ptr;
1303}
1304static char *xxstrdup(int lineno, const char *str)
1305{
1306 char *ptr = xstrdup(str);
1307 fdprintf(2, "line %d: strdup %p\n", lineno, ptr);
1308 return ptr;
1309}
1310static void xxfree(void *ptr)
1311{
1312 fdprintf(2, "free %p\n", ptr);
1313 free(ptr);
1314}
Denys Vlasenko8391c482010-05-22 17:50:43 +02001315# define xmalloc(s) xxmalloc(__LINE__, s)
1316# define xrealloc(p, s) xxrealloc(__LINE__, p, s)
1317# define xstrdup(s) xxstrdup(__LINE__, s)
1318# define free(p) xxfree(p)
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001319#endif
1320
1321
1322/* Syntax and runtime errors. They always abort scripts.
1323 * In interactive use they usually discard unparsed and/or unexecuted commands
1324 * and return to the prompt.
1325 * HUSH_DEBUG >= 2 prints line number in this file where it was detected.
1326 */
1327#if HUSH_DEBUG < 2
Denys Vlasenko39701202017-08-02 19:44:05 +02001328# define msg_and_die_if_script(lineno, ...) msg_and_die_if_script(__VA_ARGS__)
Denis Vlasenkoc0ea3292009-04-10 21:22:02 +00001329# define syntax_error(lineno, msg) syntax_error(msg)
1330# define syntax_error_at(lineno, msg) syntax_error_at(msg)
1331# define syntax_error_unterm_ch(lineno, ch) syntax_error_unterm_ch(ch)
1332# define syntax_error_unterm_str(lineno, s) syntax_error_unterm_str(s)
1333# define syntax_error_unexpected_ch(lineno, ch) syntax_error_unexpected_ch(ch)
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001334#endif
1335
Denys Vlasenko39701202017-08-02 19:44:05 +02001336static void die_if_script(void)
1337{
1338 if (!G_interactive_fd) {
1339 if (G.last_exitcode) /* sometines it's 2, not 1 (bash compat) */
1340 xfunc_error_retval = G.last_exitcode;
1341 xfunc_die();
1342 }
1343}
1344
1345static void msg_and_die_if_script(unsigned lineno, const char *fmt, ...)
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001346{
Denis Vlasenkod68ae082009-04-09 20:41:34 +00001347 va_list p;
1348
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001349#if HUSH_DEBUG >= 2
1350 bb_error_msg("hush.c:%u", lineno);
1351#endif
Denis Vlasenkod68ae082009-04-09 20:41:34 +00001352 va_start(p, fmt);
1353 bb_verror_msg(fmt, p, NULL);
1354 va_end(p);
Denys Vlasenko39701202017-08-02 19:44:05 +02001355 die_if_script();
Mike Frysinger6379bb42009-03-28 18:55:03 +00001356}
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001357
Denys Vlasenkocecbc982011-03-30 18:54:52 +02001358static void syntax_error(unsigned lineno UNUSED_PARAM, const char *msg)
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001359{
1360 if (msg)
Denys Vlasenkocecbc982011-03-30 18:54:52 +02001361 bb_error_msg("syntax error: %s", msg);
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001362 else
Denys Vlasenkocecbc982011-03-30 18:54:52 +02001363 bb_error_msg("syntax error");
Denys Vlasenko39701202017-08-02 19:44:05 +02001364 die_if_script();
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001365}
1366
Denys Vlasenkocecbc982011-03-30 18:54:52 +02001367static void syntax_error_at(unsigned lineno UNUSED_PARAM, const char *msg)
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001368{
Denys Vlasenkocecbc982011-03-30 18:54:52 +02001369 bb_error_msg("syntax error at '%s'", msg);
Denys Vlasenko39701202017-08-02 19:44:05 +02001370 die_if_script();
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001371}
1372
Denys Vlasenkocecbc982011-03-30 18:54:52 +02001373static void syntax_error_unterm_str(unsigned lineno UNUSED_PARAM, const char *s)
Mike Frysinger6a46ab82009-06-01 14:14:36 -04001374{
Denys Vlasenkocecbc982011-03-30 18:54:52 +02001375 bb_error_msg("syntax error: unterminated %s", s);
Denys Vlasenko39701202017-08-02 19:44:05 +02001376//? source4.tests fails: in bash, echo ${^} in script does not terminate the script
1377// die_if_script();
Mike Frysinger6a46ab82009-06-01 14:14:36 -04001378}
1379
Denis Vlasenkod68ae082009-04-09 20:41:34 +00001380static void syntax_error_unterm_ch(unsigned lineno, char ch)
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001381{
Mike Frysinger6a46ab82009-06-01 14:14:36 -04001382 char msg[2] = { ch, '\0' };
1383 syntax_error_unterm_str(lineno, msg);
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001384}
1385
Denys Vlasenkocecbc982011-03-30 18:54:52 +02001386static void syntax_error_unexpected_ch(unsigned lineno UNUSED_PARAM, int ch)
Denis Vlasenkoc0ea3292009-04-10 21:22:02 +00001387{
1388 char msg[2];
1389 msg[0] = ch;
1390 msg[1] = '\0';
Denys Vlasenkob05bcaf2017-01-03 11:47:50 +01001391#if HUSH_DEBUG >= 2
1392 bb_error_msg("hush.c:%u", lineno);
1393#endif
Denys Vlasenkocecbc982011-03-30 18:54:52 +02001394 bb_error_msg("syntax error: unexpected %s", ch == EOF ? "EOF" : msg);
Denys Vlasenko39701202017-08-02 19:44:05 +02001395 die_if_script();
Denis Vlasenkoc0ea3292009-04-10 21:22:02 +00001396}
1397
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001398#if HUSH_DEBUG < 2
Denys Vlasenko39701202017-08-02 19:44:05 +02001399# undef msg_and_die_if_script
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001400# undef syntax_error
1401# undef syntax_error_at
Denis Vlasenkod68ae082009-04-09 20:41:34 +00001402# undef syntax_error_unterm_ch
1403# undef syntax_error_unterm_str
Denis Vlasenkoc0ea3292009-04-10 21:22:02 +00001404# undef syntax_error_unexpected_ch
Denis Vlasenko90e485c2007-05-23 15:22:50 +00001405#else
Denys Vlasenko39701202017-08-02 19:44:05 +02001406# define msg_and_die_if_script(...) msg_and_die_if_script(__LINE__, __VA_ARGS__)
Denis Vlasenkoc0ea3292009-04-10 21:22:02 +00001407# define syntax_error(msg) syntax_error(__LINE__, msg)
1408# define syntax_error_at(msg) syntax_error_at(__LINE__, msg)
1409# define syntax_error_unterm_ch(ch) syntax_error_unterm_ch(__LINE__, ch)
1410# define syntax_error_unterm_str(s) syntax_error_unterm_str(__LINE__, s)
1411# define syntax_error_unexpected_ch(ch) syntax_error_unexpected_ch(__LINE__, ch)
Denis Vlasenko90e485c2007-05-23 15:22:50 +00001412#endif
Eric Andersen25f27032001-04-26 23:22:31 +00001413
Denis Vlasenko552433b2009-04-04 19:29:21 +00001414
Denys Vlasenkof5018da2018-04-06 17:58:21 +02001415#if ENABLE_HUSH_INTERACTIVE && ENABLE_FEATURE_EDITING_FANCY_PROMPT
Mike Frysinger67c1c7b2009-04-24 06:26:18 +00001416static void cmdedit_update_prompt(void);
1417#else
Denys Vlasenko28a105d2009-06-01 11:26:30 +02001418# define cmdedit_update_prompt() ((void)0)
Mike Frysinger67c1c7b2009-04-24 06:26:18 +00001419#endif
1420
1421
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001422/* Utility functions
1423 */
Denis Vlasenko55789c62008-06-18 16:30:42 +00001424/* Replace each \x with x in place, return ptr past NUL. */
1425static char *unbackslash(char *src)
1426{
Denys Vlasenko71885402009-09-24 01:44:13 +02001427 char *dst = src = strchrnul(src, '\\');
Denis Vlasenko55789c62008-06-18 16:30:42 +00001428 while (1) {
Denys Vlasenko89e9d552018-04-11 01:15:33 +02001429 if (*src == '\\') {
Denis Vlasenko55789c62008-06-18 16:30:42 +00001430 src++;
Denys Vlasenko89e9d552018-04-11 01:15:33 +02001431 if (*src != '\0') {
1432 /* \x -> x */
1433 *dst++ = *src++;
1434 continue;
1435 }
1436 /* else: "\<nul>". Do not delete this backslash.
1437 * Testcase: eval 'echo ok\'
1438 */
1439 *dst++ = '\\';
1440 /* fallthrough */
1441 }
Denis Vlasenko55789c62008-06-18 16:30:42 +00001442 if ((*dst++ = *src++) == '\0')
1443 break;
1444 }
1445 return dst;
1446}
1447
Denis Vlasenko11fb7cf2009-03-20 10:13:08 +00001448static char **add_strings_to_strings(char **strings, char **add, int need_to_dup)
Denis Vlasenkod65ea392007-10-01 10:02:25 +00001449{
1450 int i;
1451 unsigned count1;
1452 unsigned count2;
1453 char **v;
1454
1455 v = strings;
1456 count1 = 0;
1457 if (v) {
1458 while (*v) {
1459 count1++;
1460 v++;
1461 }
1462 }
1463 count2 = 0;
1464 v = add;
1465 while (*v) {
1466 count2++;
1467 v++;
1468 }
1469 v = xrealloc(strings, (count1 + count2 + 1) * sizeof(char*));
1470 v[count1 + count2] = NULL;
1471 i = count2;
1472 while (--i >= 0)
Denis Vlasenko11fb7cf2009-03-20 10:13:08 +00001473 v[count1 + i] = (need_to_dup ? xstrdup(add[i]) : add[i]);
Denis Vlasenkod65ea392007-10-01 10:02:25 +00001474 return v;
1475}
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001476#if LEAK_HUNTING
Denis Vlasenkocc90f442009-04-08 16:40:34 +00001477static char **xx_add_strings_to_strings(int lineno, char **strings, char **add, int need_to_dup)
1478{
1479 char **ptr = add_strings_to_strings(strings, add, need_to_dup);
1480 fdprintf(2, "line %d: add_strings_to_strings %p\n", lineno, ptr);
1481 return ptr;
1482}
1483#define add_strings_to_strings(strings, add, need_to_dup) \
1484 xx_add_strings_to_strings(__LINE__, strings, add, need_to_dup)
1485#endif
Denis Vlasenkod65ea392007-10-01 10:02:25 +00001486
Denys Vlasenkocb6ff252009-05-04 00:14:30 +02001487/* Note: takes ownership of "add" ptr (it is not strdup'ed) */
Denis Vlasenko22d10a02008-10-13 08:53:43 +00001488static char **add_string_to_strings(char **strings, char *add)
Denis Vlasenkod65ea392007-10-01 10:02:25 +00001489{
1490 char *v[2];
Denis Vlasenkod65ea392007-10-01 10:02:25 +00001491 v[0] = add;
1492 v[1] = NULL;
Denis Vlasenko11fb7cf2009-03-20 10:13:08 +00001493 return add_strings_to_strings(strings, v, /*dup:*/ 0);
Denis Vlasenko22d10a02008-10-13 08:53:43 +00001494}
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001495#if LEAK_HUNTING
Denis Vlasenkocc90f442009-04-08 16:40:34 +00001496static char **xx_add_string_to_strings(int lineno, char **strings, char *add)
1497{
1498 char **ptr = add_string_to_strings(strings, add);
1499 fdprintf(2, "line %d: add_string_to_strings %p\n", lineno, ptr);
1500 return ptr;
1501}
1502#define add_string_to_strings(strings, add) \
1503 xx_add_string_to_strings(__LINE__, strings, add)
1504#endif
Denis Vlasenkod65ea392007-10-01 10:02:25 +00001505
Denys Vlasenkoacdc49c2009-05-04 01:58:10 +02001506static void free_strings(char **strings)
Denis Vlasenkod65ea392007-10-01 10:02:25 +00001507{
Denis Vlasenkoafd7a8d2008-10-09 16:29:44 +00001508 char **v;
1509
1510 if (!strings)
1511 return;
Denis Vlasenkoafd7a8d2008-10-09 16:29:44 +00001512 v = strings;
1513 while (*v) {
Denys Vlasenkoacdc49c2009-05-04 01:58:10 +02001514 free(*v);
1515 v++;
Denis Vlasenkod65ea392007-10-01 10:02:25 +00001516 }
Denis Vlasenkoafd7a8d2008-10-09 16:29:44 +00001517 free(strings);
Denis Vlasenkod65ea392007-10-01 10:02:25 +00001518}
1519
Denys Vlasenko9acd63c2018-03-28 18:35:07 +02001520static int dup_CLOEXEC(int fd, int avoid_fd)
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02001521{
Denys Vlasenko2db74612017-07-07 22:07:28 +02001522 int newfd;
1523 repeat:
Denys Vlasenko9acd63c2018-03-28 18:35:07 +02001524 newfd = fcntl(fd, F_DUPFD_CLOEXEC, avoid_fd + 1);
1525 if (newfd >= 0) {
1526 if (F_DUPFD_CLOEXEC == F_DUPFD) /* if old libc (w/o F_DUPFD_CLOEXEC) */
1527 fcntl(newfd, F_SETFD, FD_CLOEXEC);
1528 } else { /* newfd < 0 */
Denys Vlasenko2db74612017-07-07 22:07:28 +02001529 if (errno == EBUSY)
1530 goto repeat;
1531 if (errno == EINTR)
1532 goto repeat;
1533 }
1534 return newfd;
1535}
1536
Denys Vlasenko657e9002017-07-30 23:34:04 +02001537static int xdup_CLOEXEC_and_close(int fd, int avoid_fd)
Denys Vlasenko2db74612017-07-07 22:07:28 +02001538{
1539 int newfd;
1540 repeat:
Denys Vlasenko657e9002017-07-30 23:34:04 +02001541 newfd = fcntl(fd, F_DUPFD_CLOEXEC, avoid_fd + 1);
Denys Vlasenko2db74612017-07-07 22:07:28 +02001542 if (newfd < 0) {
1543 if (errno == EBUSY)
1544 goto repeat;
1545 if (errno == EINTR)
1546 goto repeat;
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02001547 /* fd was not open? */
1548 if (errno == EBADF)
1549 return fd;
1550 xfunc_die();
1551 }
Denys Vlasenko657e9002017-07-30 23:34:04 +02001552 if (F_DUPFD_CLOEXEC == F_DUPFD) /* if old libc (w/o F_DUPFD_CLOEXEC) */
1553 fcntl(newfd, F_SETFD, FD_CLOEXEC);
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02001554 close(fd);
1555 return newfd;
1556}
1557
1558
Denys Vlasenko7b25b1c2016-08-20 15:58:34 +02001559/* Manipulating the list of open FILEs */
1560static FILE *remember_FILE(FILE *fp)
1561{
1562 if (fp) {
Denys Vlasenko7b25b1c2016-08-20 15:58:34 +02001563 struct FILE_list *n = xmalloc(sizeof(*n));
Denys Vlasenko7b25b1c2016-08-20 15:58:34 +02001564 n->next = G.FILE_list;
1565 G.FILE_list = n;
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02001566 n->fp = fp;
1567 n->fd = fileno(fp);
1568 close_on_exec_on(n->fd);
Denys Vlasenko7b25b1c2016-08-20 15:58:34 +02001569 }
1570 return fp;
1571}
Denys Vlasenko7b25b1c2016-08-20 15:58:34 +02001572static void fclose_and_forget(FILE *fp)
1573{
1574 struct FILE_list **pp = &G.FILE_list;
1575 while (*pp) {
1576 struct FILE_list *cur = *pp;
1577 if (cur->fp == fp) {
1578 *pp = cur->next;
1579 free(cur);
1580 break;
1581 }
1582 pp = &cur->next;
1583 }
1584 fclose(fp);
1585}
Denys Vlasenko2db74612017-07-07 22:07:28 +02001586static int save_FILEs_on_redirect(int fd, int avoid_fd)
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02001587{
1588 struct FILE_list *fl = G.FILE_list;
1589 while (fl) {
1590 if (fd == fl->fd) {
1591 /* We use it only on script files, they are all CLOEXEC */
Denys Vlasenko657e9002017-07-30 23:34:04 +02001592 fl->fd = xdup_CLOEXEC_and_close(fd, avoid_fd);
Denys Vlasenko2db74612017-07-07 22:07:28 +02001593 debug_printf_redir("redirect_fd %d: matches a script fd, moving it to %d\n", fd, fl->fd);
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02001594 return 1;
1595 }
1596 fl = fl->next;
1597 }
1598 return 0;
1599}
1600static void restore_redirected_FILEs(void)
1601{
1602 struct FILE_list *fl = G.FILE_list;
1603 while (fl) {
1604 int should_be = fileno(fl->fp);
1605 if (fl->fd != should_be) {
Denys Vlasenko2db74612017-07-07 22:07:28 +02001606 debug_printf_redir("restoring script fd from %d to %d\n", fl->fd, should_be);
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02001607 xmove_fd(fl->fd, should_be);
1608 fl->fd = should_be;
1609 }
1610 fl = fl->next;
1611 }
1612}
Denys Vlasenko4ee824f2017-07-03 01:22:13 +02001613#if ENABLE_FEATURE_SH_STANDALONE && BB_MMU
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02001614static void close_all_FILE_list(void)
1615{
1616 struct FILE_list *fl = G.FILE_list;
1617 while (fl) {
1618 /* fclose would also free FILE object.
1619 * It is disastrous if we share memory with a vforked parent.
1620 * I'm not sure we never come here after vfork.
1621 * Therefore just close fd, nothing more.
1622 */
1623 /*fclose(fl->fp); - unsafe */
1624 close(fl->fd);
1625 fl = fl->next;
1626 }
1627}
Denys Vlasenko7b25b1c2016-08-20 15:58:34 +02001628#endif
Denys Vlasenko32fdf2f2017-07-31 04:32:06 +02001629static int fd_in_FILEs(int fd)
1630{
1631 struct FILE_list *fl = G.FILE_list;
1632 while (fl) {
1633 if (fl->fd == fd)
1634 return 1;
1635 fl = fl->next;
1636 }
1637 return 0;
1638}
Denys Vlasenko7b25b1c2016-08-20 15:58:34 +02001639
1640
Denis Vlasenko270b1c32009-04-17 18:54:50 +00001641/* Helpers for setting new $n and restoring them back
1642 */
1643typedef struct save_arg_t {
1644 char *sv_argv0;
1645 char **sv_g_argv;
1646 int sv_g_argc;
Denys Vlasenko4e4f88e2017-01-09 07:57:38 +01001647 IF_HUSH_SET(smallint sv_g_malloced;)
Denis Vlasenko270b1c32009-04-17 18:54:50 +00001648} save_arg_t;
1649
1650static void save_and_replace_G_args(save_arg_t *sv, char **argv)
1651{
Denis Vlasenko270b1c32009-04-17 18:54:50 +00001652 sv->sv_argv0 = argv[0];
1653 sv->sv_g_argv = G.global_argv;
1654 sv->sv_g_argc = G.global_argc;
Denys Vlasenko4e4f88e2017-01-09 07:57:38 +01001655 IF_HUSH_SET(sv->sv_g_malloced = G.global_args_malloced;)
Denis Vlasenko270b1c32009-04-17 18:54:50 +00001656
1657 argv[0] = G.global_argv[0]; /* retain $0 */
1658 G.global_argv = argv;
Denys Vlasenko4e4f88e2017-01-09 07:57:38 +01001659 IF_HUSH_SET(G.global_args_malloced = 0;)
Denis Vlasenko270b1c32009-04-17 18:54:50 +00001660
Denys Vlasenkod4e4fdb2017-07-03 21:31:16 +02001661 G.global_argc = 1 + string_array_len(argv + 1);
Denis Vlasenko270b1c32009-04-17 18:54:50 +00001662}
1663
1664static void restore_G_args(save_arg_t *sv, char **argv)
1665{
Denys Vlasenko4e4f88e2017-01-09 07:57:38 +01001666#if ENABLE_HUSH_SET
Denis Vlasenko270b1c32009-04-17 18:54:50 +00001667 if (G.global_args_malloced) {
1668 /* someone ran "set -- arg1 arg2 ...", undo */
Denys Vlasenko4e4f88e2017-01-09 07:57:38 +01001669 char **pp = G.global_argv;
Denis Vlasenko270b1c32009-04-17 18:54:50 +00001670 while (*++pp) /* note: does not free $0 */
1671 free(*pp);
1672 free(G.global_argv);
1673 }
Denys Vlasenko4e4f88e2017-01-09 07:57:38 +01001674#endif
Denis Vlasenko270b1c32009-04-17 18:54:50 +00001675 argv[0] = sv->sv_argv0;
1676 G.global_argv = sv->sv_g_argv;
1677 G.global_argc = sv->sv_g_argc;
Denys Vlasenko4e4f88e2017-01-09 07:57:38 +01001678 IF_HUSH_SET(G.global_args_malloced = sv->sv_g_malloced;)
Denis Vlasenko270b1c32009-04-17 18:54:50 +00001679}
1680
1681
Denis Vlasenkod5762932009-03-31 11:22:57 +00001682/* Basic theory of signal handling in shell
1683 * ========================================
Denis Vlasenko7b830e72009-03-31 13:05:32 +00001684 * This does not describe what hush does, rather, it is current understanding
1685 * what it _should_ do. If it doesn't, it's a bug.
Denis Vlasenkod5762932009-03-31 11:22:57 +00001686 * http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#trap
1687 *
1688 * Signals are handled only after each pipe ("cmd | cmd | cmd" thing)
1689 * is finished or backgrounded. It is the same in interactive and
1690 * non-interactive shells, and is the same regardless of whether
Denis Vlasenko7b830e72009-03-31 13:05:32 +00001691 * a user trap handler is installed or a shell special one is in effect.
Denys Vlasenko69b1cef2009-09-21 10:21:44 +02001692 * ^C or ^Z from keyboard seems to execute "at once" because it usually
Denis Vlasenkod5762932009-03-31 11:22:57 +00001693 * backgrounds (i.e. stops) or kills all members of currently running
1694 * pipe.
1695 *
Denys Vlasenko8bd810b2013-11-28 01:50:01 +01001696 * Wait builtin is interruptible by signals for which user trap is set
Denis Vlasenkod5762932009-03-31 11:22:57 +00001697 * or by SIGINT in interactive shell.
1698 *
1699 * Trap handlers will execute even within trap handlers. (right?)
1700 *
Denys Vlasenkoe89a2412010-01-12 15:19:31 +01001701 * User trap handlers are forgotten when subshell ("(cmd)") is entered,
1702 * except for handlers set to '' (empty string).
Denis Vlasenkod5762932009-03-31 11:22:57 +00001703 *
1704 * If job control is off, backgrounded commands ("cmd &")
Denis Vlasenko7b830e72009-03-31 13:05:32 +00001705 * have SIGINT, SIGQUIT set to SIG_IGN.
Denis Vlasenkod5762932009-03-31 11:22:57 +00001706 *
Denys Vlasenko28a105d2009-06-01 11:26:30 +02001707 * Commands which are run in command substitution ("`cmd`")
Denis Vlasenko7b830e72009-03-31 13:05:32 +00001708 * have SIGTTIN, SIGTTOU, SIGTSTP set to SIG_IGN.
Denis Vlasenkod5762932009-03-31 11:22:57 +00001709 *
Denys Vlasenko4b7db4f2009-05-29 10:39:06 +02001710 * Ordinary commands have signals set to SIG_IGN/DFL as inherited
Denis Vlasenko7b830e72009-03-31 13:05:32 +00001711 * by the shell from its parent.
Denis Vlasenkod5762932009-03-31 11:22:57 +00001712 *
Denys Vlasenko28a105d2009-06-01 11:26:30 +02001713 * Signals which differ from SIG_DFL action
Denis Vlasenko7b830e72009-03-31 13:05:32 +00001714 * (note: child (i.e., [v]forked) shell is not an interactive shell):
Denis Vlasenkod5762932009-03-31 11:22:57 +00001715 *
1716 * SIGQUIT: ignore
1717 * SIGTERM (interactive): ignore
Denis Vlasenko7b830e72009-03-31 13:05:32 +00001718 * SIGHUP (interactive):
1719 * send SIGCONT to stopped jobs, send SIGHUP to all jobs and exit
Denis Vlasenkod5762932009-03-31 11:22:57 +00001720 * SIGTTIN, SIGTTOU, SIGTSTP (if job control is on): ignore
Denis Vlasenkoc4ada792009-04-15 23:29:00 +00001721 * Note that ^Z is handled not by trapping SIGTSTP, but by seeing
1722 * that all pipe members are stopped. Try this in bash:
1723 * while :; do :; done - ^Z does not background it
1724 * (while :; do :; done) - ^Z backgrounds it
Denis Vlasenkod5762932009-03-31 11:22:57 +00001725 * SIGINT (interactive): wait for last pipe, ignore the rest
Denis Vlasenko7b830e72009-03-31 13:05:32 +00001726 * of the command line, show prompt. NB: ^C does not send SIGINT
1727 * to interactive shell while shell is waiting for a pipe,
1728 * since shell is bg'ed (is not in foreground process group).
Denis Vlasenko7b830e72009-03-31 13:05:32 +00001729 * Example 1: this waits 5 sec, but does not execute ls:
1730 * "echo $$; sleep 5; ls -l" + "kill -INT <pid>"
1731 * Example 2: this does not wait and does not execute ls:
1732 * "echo $$; sleep 5 & wait; ls -l" + "kill -INT <pid>"
1733 * Example 3: this does not wait 5 sec, but executes ls:
1734 * "sleep 5; ls -l" + press ^C
Denys Vlasenkob8709032011-05-08 21:20:01 +02001735 * Example 4: this does not wait and does not execute ls:
1736 * "sleep 5 & wait; ls -l" + press ^C
Denis Vlasenkod5762932009-03-31 11:22:57 +00001737 *
1738 * (What happens to signals which are IGN on shell start?)
1739 * (What happens with signal mask on shell start?)
1740 *
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001741 * Old implementation
1742 * ==================
Denis Vlasenkod5762932009-03-31 11:22:57 +00001743 * We use in-kernel pending signal mask to determine which signals were sent.
1744 * We block all signals which we don't want to take action immediately,
1745 * i.e. we block all signals which need to have special handling as described
1746 * above, and all signals which have traps set.
1747 * After each pipe execution, we extract any pending signals via sigtimedwait()
1748 * and act on them.
1749 *
Denys Vlasenko10c01312011-05-11 11:49:21 +02001750 * unsigned special_sig_mask: a mask of such "special" signals
Denis Vlasenkod5762932009-03-31 11:22:57 +00001751 * sigset_t blocked_set: current blocked signal set
1752 *
Denis Vlasenko7b830e72009-03-31 13:05:32 +00001753 * "trap - SIGxxx":
Denys Vlasenko10c01312011-05-11 11:49:21 +02001754 * clear bit in blocked_set unless it is also in special_sig_mask
Denis Vlasenko7b830e72009-03-31 13:05:32 +00001755 * "trap 'cmd' SIGxxx":
1756 * set bit in blocked_set (even if 'cmd' is '')
Denis Vlasenkod5762932009-03-31 11:22:57 +00001757 * after [v]fork, if we plan to be a shell:
Denis Vlasenko6b9e0532009-04-18 01:23:21 +00001758 * unblock signals with special interactive handling
1759 * (child shell is not interactive),
Denys Vlasenkoe89a2412010-01-12 15:19:31 +01001760 * unset all traps except '' (note: regardless of child shell's type - {}, (), etc)
Denis Vlasenkod5762932009-03-31 11:22:57 +00001761 * after [v]fork, if we plan to exec:
Denys Vlasenko69b1cef2009-09-21 10:21:44 +02001762 * POSIX says fork clears pending signal mask in child - no need to clear it.
Denis Vlasenko7b830e72009-03-31 13:05:32 +00001763 * Restore blocked signal set to one inherited by shell just prior to exec.
Denis Vlasenkod5762932009-03-31 11:22:57 +00001764 *
Denis Vlasenko7566bae2009-03-31 17:24:49 +00001765 * Note: as a result, we do not use signal handlers much. The only uses
Denys Vlasenko8d7be232009-05-25 16:38:32 +02001766 * are to count SIGCHLDs
Denis Vlasenko7566bae2009-03-31 17:24:49 +00001767 * and to restore tty pgrp on signal-induced exit.
Denys Vlasenko4ea0ca82009-09-25 12:58:37 +02001768 *
Denys Vlasenko67f71862009-09-25 14:21:06 +02001769 * Note 2 (compat):
Denys Vlasenko4ea0ca82009-09-25 12:58:37 +02001770 * Standard says "When a subshell is entered, traps that are not being ignored
1771 * are set to the default actions". bash interprets it so that traps which
Denys Vlasenkoe89a2412010-01-12 15:19:31 +01001772 * are set to '' (ignore) are NOT reset to defaults. We do the same.
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001773 *
1774 * Problem: the above approach makes it unwieldy to catch signals while
Denys Vlasenkoe95738f2013-07-08 03:13:08 +02001775 * we are in read builtin, or while we read commands from stdin:
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001776 * masked signals are not visible!
1777 *
1778 * New implementation
1779 * ==================
1780 * We record each signal we are interested in by installing signal handler
1781 * for them - a bit like emulating kernel pending signal mask in userspace.
1782 * We are interested in: signals which need to have special handling
1783 * as described above, and all signals which have traps set.
Denys Vlasenko8bd810b2013-11-28 01:50:01 +01001784 * Signals are recorded in pending_set.
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001785 * After each pipe execution, we extract any pending signals
1786 * and act on them.
1787 *
1788 * unsigned special_sig_mask: a mask of shell-special signals.
1789 * unsigned fatal_sig_mask: a mask of signals on which we restore tty pgrp.
1790 * char *traps[sig] if trap for sig is set (even if it's '').
1791 * sigset_t pending_set: set of sigs we received.
1792 *
1793 * "trap - SIGxxx":
1794 * if sig is in special_sig_mask, set handler back to:
1795 * record_pending_signo, or to IGN if it's a tty stop signal
1796 * if sig is in fatal_sig_mask, set handler back to sigexit.
1797 * else: set handler back to SIG_DFL
1798 * "trap 'cmd' SIGxxx":
1799 * set handler to record_pending_signo.
1800 * "trap '' SIGxxx":
1801 * set handler to SIG_IGN.
1802 * after [v]fork, if we plan to be a shell:
1803 * set signals with special interactive handling to SIG_DFL
1804 * (because child shell is not interactive),
1805 * unset all traps except '' (note: regardless of child shell's type - {}, (), etc)
1806 * after [v]fork, if we plan to exec:
1807 * POSIX says fork clears pending signal mask in child - no need to clear it.
1808 *
1809 * To make wait builtin interruptible, we handle SIGCHLD as special signal,
1810 * otherwise (if we leave it SIG_DFL) sigsuspend in wait builtin will not wake up on it.
1811 *
1812 * Note (compat):
1813 * Standard says "When a subshell is entered, traps that are not being ignored
1814 * are set to the default actions". bash interprets it so that traps which
1815 * are set to '' (ignore) are NOT reset to defaults. We do the same.
Denis Vlasenkod5762932009-03-31 11:22:57 +00001816 */
Denis Vlasenkoe4bd4f22009-04-17 13:52:51 +00001817enum {
1818 SPECIAL_INTERACTIVE_SIGS = 0
Denis Vlasenkoe4bd4f22009-04-17 13:52:51 +00001819 | (1 << SIGTERM)
Denis Vlasenkoe4bd4f22009-04-17 13:52:51 +00001820 | (1 << SIGINT)
Denis Vlasenkoc8653f62009-04-27 23:29:14 +00001821 | (1 << SIGHUP)
1822 ,
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001823 SPECIAL_JOBSTOP_SIGS = 0
Mike Frysinger38478a62009-05-20 04:48:06 -04001824#if ENABLE_HUSH_JOB
Denis Vlasenkoc8653f62009-04-27 23:29:14 +00001825 | (1 << SIGTTIN)
1826 | (1 << SIGTTOU)
1827 | (1 << SIGTSTP)
1828#endif
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001829 ,
Denis Vlasenkoe4bd4f22009-04-17 13:52:51 +00001830};
Denis Vlasenkod5762932009-03-31 11:22:57 +00001831
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001832static void record_pending_signo(int sig)
Denys Vlasenko54e9e122011-05-09 00:52:15 +02001833{
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001834 sigaddset(&G.pending_set, sig);
Denys Vlasenko8d7be232009-05-25 16:38:32 +02001835#if ENABLE_HUSH_FAST
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001836 if (sig == SIGCHLD) {
1837 G.count_SIGCHLD++;
Denys Vlasenko8d7be232009-05-25 16:38:32 +02001838//bb_error_msg("[%d] SIGCHLD_handler: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD);
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001839 }
Denys Vlasenko8d7be232009-05-25 16:38:32 +02001840#endif
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001841}
Denis Vlasenko7566bae2009-03-31 17:24:49 +00001842
Denys Vlasenko0806e402011-05-12 23:06:20 +02001843static sighandler_t install_sighandler(int sig, sighandler_t handler)
1844{
1845 struct sigaction old_sa;
1846
1847 /* We could use signal() to install handlers... almost:
1848 * except that we need to mask ALL signals while handlers run.
1849 * I saw signal nesting in strace, race window isn't small.
1850 * SA_RESTART is also needed, but in Linux, signal()
1851 * sets SA_RESTART too.
1852 */
1853 /* memset(&G.sa, 0, sizeof(G.sa)); - already done */
1854 /* sigfillset(&G.sa.sa_mask); - already done */
1855 /* G.sa.sa_flags = SA_RESTART; - already done */
1856 G.sa.sa_handler = handler;
1857 sigaction(sig, &G.sa, &old_sa);
1858 return old_sa.sa_handler;
1859}
1860
Denys Vlasenkoe9abe752016-08-19 20:15:26 +02001861static void hush_exit(int exitcode) NORETURN;
Denys Vlasenkoe9abe752016-08-19 20:15:26 +02001862
Denys Vlasenkob6afcc72016-12-12 16:30:20 +01001863static void restore_ttypgrp_and__exit(void) NORETURN;
Denys Vlasenkoe9abe752016-08-19 20:15:26 +02001864static void restore_ttypgrp_and__exit(void)
1865{
1866 /* xfunc has failed! die die die */
1867 /* no EXIT traps, this is an escape hatch! */
1868 G.exiting = 1;
1869 hush_exit(xfunc_error_retval);
1870}
1871
Denys Vlasenkob6afcc72016-12-12 16:30:20 +01001872#if ENABLE_HUSH_JOB
1873
Denys Vlasenkoe9abe752016-08-19 20:15:26 +02001874/* Needed only on some libc:
1875 * It was observed that on exit(), fgetc'ed buffered data
1876 * gets "unwound" via lseek(fd, -NUM, SEEK_CUR).
1877 * With the net effect that even after fork(), not vfork(),
1878 * exit() in NOEXECed applet in "sh SCRIPT":
1879 * noexec_applet_here
1880 * echo END_OF_SCRIPT
1881 * lseeks fd in input FILE object from EOF to "e" in "echo END_OF_SCRIPT".
1882 * This makes "echo END_OF_SCRIPT" executed twice.
Denys Vlasenko39701202017-08-02 19:44:05 +02001883 * Similar problems can be seen with msg_and_die_if_script() -> xfunc_die()
Denys Vlasenkoe9abe752016-08-19 20:15:26 +02001884 * and in `cmd` handling.
1885 * If set as die_func(), this makes xfunc_die() exit via _exit(), not exit():
1886 */
Denys Vlasenkob6afcc72016-12-12 16:30:20 +01001887static void fflush_and__exit(void) NORETURN;
Denys Vlasenkoe9abe752016-08-19 20:15:26 +02001888static void fflush_and__exit(void)
1889{
1890 fflush_all();
1891 _exit(xfunc_error_retval);
1892}
1893
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00001894/* After [v]fork, in child: do not restore tty pgrp on xfunc death */
Denys Vlasenkoe9abe752016-08-19 20:15:26 +02001895# define disable_restore_tty_pgrp_on_exit() (die_func = fflush_and__exit)
Denis Vlasenko25af86f2009-04-07 13:29:27 +00001896/* After [v]fork, in parent: restore tty pgrp on xfunc death */
Denys Vlasenkoe9abe752016-08-19 20:15:26 +02001897# define enable_restore_tty_pgrp_on_exit() (die_func = restore_ttypgrp_and__exit)
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00001898
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00001899/* Restores tty foreground process group, and exits.
1900 * May be called as signal handler for fatal signal
Denis Vlasenko6b9e0532009-04-18 01:23:21 +00001901 * (will resend signal to itself, producing correct exit state)
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00001902 * or called directly with -EXITCODE.
Denys Vlasenkoe9abe752016-08-19 20:15:26 +02001903 * We also call it if xfunc is exiting.
1904 */
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +00001905static void sigexit(int sig) NORETURN;
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00001906static void sigexit(int sig)
1907{
Denis Vlasenkoabedaac2009-03-31 12:03:40 +00001908 /* Careful: we can end up here after [v]fork. Do not restore
Denis Vlasenko7b830e72009-03-31 13:05:32 +00001909 * tty pgrp then, only top-level shell process does that */
Denys Vlasenkoebc1ee22011-05-12 10:59:18 +02001910 if (G_saved_tty_pgrp && getpid() == G.root_pid) {
1911 /* Disable all signals: job control, SIGPIPE, etc.
1912 * Mostly paranoid measure, to prevent infinite SIGTTOU.
1913 */
1914 sigprocmask_allsigs(SIG_BLOCK);
Mike Frysinger38478a62009-05-20 04:48:06 -04001915 tcsetpgrp(G_interactive_fd, G_saved_tty_pgrp);
Denys Vlasenkoebc1ee22011-05-12 10:59:18 +02001916 }
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00001917
1918 /* Not a signal, just exit */
1919 if (sig <= 0)
1920 _exit(- sig);
1921
Denis Vlasenko400d8bb2008-02-24 13:36:01 +00001922 kill_myself_with_sig(sig); /* does not return */
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00001923}
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00001924#else
1925
Denys Vlasenko8391c482010-05-22 17:50:43 +02001926# define disable_restore_tty_pgrp_on_exit() ((void)0)
1927# define enable_restore_tty_pgrp_on_exit() ((void)0)
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00001928
Denis Vlasenkoe0755e52009-04-03 21:16:45 +00001929#endif
Denis Vlasenkob81b3df2007-04-28 16:48:04 +00001930
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001931static sighandler_t pick_sighandler(unsigned sig)
1932{
1933 sighandler_t handler = SIG_DFL;
1934 if (sig < sizeof(unsigned)*8) {
1935 unsigned sigmask = (1 << sig);
1936
1937#if ENABLE_HUSH_JOB
Denys Vlasenko75e77de2011-05-12 13:12:47 +02001938 /* is sig fatal? */
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001939 if (G_fatal_sig_mask & sigmask)
1940 handler = sigexit;
Denys Vlasenko75e77de2011-05-12 13:12:47 +02001941 else
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001942#endif
1943 /* sig has special handling? */
Denys Vlasenko75e77de2011-05-12 13:12:47 +02001944 if (G.special_sig_mask & sigmask) {
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001945 handler = record_pending_signo;
Denys Vlasenko0c40a732011-05-12 09:50:12 +02001946 /* TTIN/TTOU/TSTP can't be set to record_pending_signo
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001947 * in order to ignore them: they will be raised
Denys Vlasenkof58f7052011-05-12 02:10:33 +02001948 * in an endless loop when we try to do some
1949 * terminal ioctls! We do have to _ignore_ these.
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001950 */
1951 if (SPECIAL_JOBSTOP_SIGS & sigmask)
1952 handler = SIG_IGN;
Denys Vlasenko0c40a732011-05-12 09:50:12 +02001953 }
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001954 }
1955 return handler;
1956}
1957
Mike Frysinger9f8128f2009-03-29 23:49:37 +00001958/* Restores tty foreground process group, and exits. */
Mike Frysinger9f8128f2009-03-29 23:49:37 +00001959static void hush_exit(int exitcode)
1960{
Denys Vlasenkobede2152011-09-04 16:12:33 +02001961#if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
1962 save_history(G.line_input_state);
1963#endif
1964
Denys Vlasenko8ee2ada2011-02-07 02:03:51 +01001965 fflush_all();
Denys Vlasenko7a85c602017-01-08 17:40:18 +01001966 if (G.exiting <= 0 && G_traps && G_traps[0] && G_traps[0][0]) {
Denys Vlasenko27c56f12010-09-07 09:56:34 +02001967 char *argv[3];
1968 /* argv[0] is unused */
Denys Vlasenko46f839c2018-01-19 16:58:44 +01001969 argv[1] = xstrdup(G_traps[0]); /* copy, since EXIT trap handler may modify G_traps[0] */
Denys Vlasenko27c56f12010-09-07 09:56:34 +02001970 argv[2] = NULL;
Denys Vlasenkoa110c902010-09-12 15:38:04 +02001971 G.exiting = 1; /* prevent EXIT trap recursion */
Denys Vlasenko7a85c602017-01-08 17:40:18 +01001972 /* Note: G_traps[0] is not cleared!
Denys Vlasenkode8c3f62010-09-12 16:13:44 +02001973 * "trap" will still show it, if executed
1974 * in the handler */
1975 builtin_eval(argv);
Denis Vlasenkod5762932009-03-31 11:22:57 +00001976 }
Mike Frysinger9f8128f2009-03-29 23:49:37 +00001977
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01001978#if ENABLE_FEATURE_CLEAN_UP
1979 {
1980 struct variable *cur_var;
1981 if (G.cwd != bb_msg_unknown)
1982 free((char*)G.cwd);
1983 cur_var = G.top_var;
1984 while (cur_var) {
1985 struct variable *tmp = cur_var;
1986 if (!cur_var->max_len)
1987 free(cur_var->varstr);
1988 cur_var = cur_var->next;
1989 free(tmp);
1990 }
1991 }
1992#endif
1993
Denys Vlasenko8131eea2009-11-02 14:19:51 +01001994 fflush_all();
Denys Vlasenko215b0ca2016-08-19 18:23:56 +02001995#if ENABLE_HUSH_JOB
Denis Vlasenkoabedaac2009-03-31 12:03:40 +00001996 sigexit(- (exitcode & 0xff));
1997#else
Denys Vlasenko215b0ca2016-08-19 18:23:56 +02001998 _exit(exitcode);
Denis Vlasenkoabedaac2009-03-31 12:03:40 +00001999#endif
Mike Frysinger9f8128f2009-03-29 23:49:37 +00002000}
2001
Denys Vlasenkoacd5bc82010-09-12 15:05:39 +02002002
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02002003//TODO: return a mask of ALL handled sigs?
2004static int check_and_run_traps(void)
Denis Vlasenko6b9e0532009-04-18 01:23:21 +00002005{
Denis Vlasenko6b9e0532009-04-18 01:23:21 +00002006 int last_sig = 0;
2007
Denis Vlasenko6b9e0532009-04-18 01:23:21 +00002008 while (1) {
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02002009 int sig;
Denys Vlasenko80542ba2011-05-08 21:23:43 +02002010
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02002011 if (sigisemptyset(&G.pending_set))
Denis Vlasenko6b9e0532009-04-18 01:23:21 +00002012 break;
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02002013 sig = 0;
2014 do {
2015 sig++;
2016 if (sigismember(&G.pending_set, sig)) {
2017 sigdelset(&G.pending_set, sig);
2018 goto got_sig;
2019 }
2020 } while (sig < NSIG);
2021 break;
Denys Vlasenkob8709032011-05-08 21:20:01 +02002022 got_sig:
Denys Vlasenko7a85c602017-01-08 17:40:18 +01002023 if (G_traps && G_traps[sig]) {
Denys Vlasenko04b46bc2016-10-01 22:28:03 +02002024 debug_printf_exec("%s: sig:%d handler:'%s'\n", __func__, sig, G.traps[sig]);
Denys Vlasenko7a85c602017-01-08 17:40:18 +01002025 if (G_traps[sig][0]) {
Denis Vlasenko6b9e0532009-04-18 01:23:21 +00002026 /* We have user-defined handler */
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02002027 smalluint save_rcode;
Denys Vlasenko27c56f12010-09-07 09:56:34 +02002028 char *argv[3];
2029 /* argv[0] is unused */
Denys Vlasenko749575d2018-01-30 04:29:03 +01002030 argv[1] = xstrdup(G_traps[sig]);
2031 /* why strdup? trap can modify itself: trap 'trap "echo oops" INT' INT */
Denys Vlasenko27c56f12010-09-07 09:56:34 +02002032 argv[2] = NULL;
Denis Vlasenko6b9e0532009-04-18 01:23:21 +00002033 save_rcode = G.last_exitcode;
2034 builtin_eval(argv);
Denys Vlasenko749575d2018-01-30 04:29:03 +01002035 free(argv[1]);
Denys Vlasenko8660aeb2016-11-24 17:44:02 +01002036//FIXME: shouldn't it be set to 128 + sig instead?
Denis Vlasenko6b9e0532009-04-18 01:23:21 +00002037 G.last_exitcode = save_rcode;
Denys Vlasenkob8709032011-05-08 21:20:01 +02002038 last_sig = sig;
Denis Vlasenko6b9e0532009-04-18 01:23:21 +00002039 } /* else: "" trap, ignoring signal */
2040 continue;
2041 }
2042 /* not a trap: special action */
2043 switch (sig) {
Denis Vlasenko6b9e0532009-04-18 01:23:21 +00002044 case SIGINT:
Denys Vlasenko04b46bc2016-10-01 22:28:03 +02002045 debug_printf_exec("%s: sig:%d default SIGINT handler\n", __func__, sig);
Denis Vlasenko6b9e0532009-04-18 01:23:21 +00002046 G.flag_SIGINT = 1;
Denys Vlasenkob8709032011-05-08 21:20:01 +02002047 last_sig = sig;
Denis Vlasenko6b9e0532009-04-18 01:23:21 +00002048 break;
2049#if ENABLE_HUSH_JOB
2050 case SIGHUP: {
Denys Vlasenko49e6bf22017-08-04 14:28:16 +02002051//TODO: why are we doing this? ash and dash don't do this,
2052//they have no handler for SIGHUP at all,
2053//they rely on kernel to send SIGHUP+SIGCONT to orphaned process groups
Denis Vlasenko6b9e0532009-04-18 01:23:21 +00002054 struct pipe *job;
Denys Vlasenko04b46bc2016-10-01 22:28:03 +02002055 debug_printf_exec("%s: sig:%d default SIGHUP handler\n", __func__, sig);
Denis Vlasenko6b9e0532009-04-18 01:23:21 +00002056 /* bash is observed to signal whole process groups,
2057 * not individual processes */
2058 for (job = G.job_list; job; job = job->next) {
2059 if (job->pgrp <= 0)
2060 continue;
2061 debug_printf_exec("HUPing pgrp %d\n", job->pgrp);
2062 if (kill(- job->pgrp, SIGHUP) == 0)
2063 kill(- job->pgrp, SIGCONT);
2064 }
2065 sigexit(SIGHUP);
2066 }
2067#endif
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02002068#if ENABLE_HUSH_FAST
2069 case SIGCHLD:
Denys Vlasenko04b46bc2016-10-01 22:28:03 +02002070 debug_printf_exec("%s: sig:%d default SIGCHLD handler\n", __func__, sig);
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02002071 G.count_SIGCHLD++;
2072//bb_error_msg("[%d] check_and_run_traps: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD);
2073 /* Note:
Denys Vlasenko10ad6222017-04-17 16:13:32 +02002074 * We don't do 'last_sig = sig' here -> NOT returning this sig.
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02002075 * This simplifies wait builtin a bit.
2076 */
2077 break;
2078#endif
Denis Vlasenko6b9e0532009-04-18 01:23:21 +00002079 default: /* ignored: */
Denys Vlasenko04b46bc2016-10-01 22:28:03 +02002080 debug_printf_exec("%s: sig:%d default handling is to ignore\n", __func__, sig);
Denis Vlasenko6b9e0532009-04-18 01:23:21 +00002081 /* SIGTERM, SIGQUIT, SIGTTIN, SIGTTOU, SIGTSTP */
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02002082 /* Note:
Denys Vlasenko10ad6222017-04-17 16:13:32 +02002083 * We don't do 'last_sig = sig' here -> NOT returning this sig.
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02002084 * Example: wait is not interrupted by TERM
Denys Vlasenkob8709032011-05-08 21:20:01 +02002085 * in interactive shell, because TERM is ignored.
2086 */
Denis Vlasenko6b9e0532009-04-18 01:23:21 +00002087 break;
2088 }
2089 }
2090 return last_sig;
2091}
2092
Denis Vlasenkob81b3df2007-04-28 16:48:04 +00002093
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02002094static const char *get_cwd(int force)
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00002095{
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02002096 if (force || G.cwd == NULL) {
2097 /* xrealloc_getcwd_or_warn(arg) calls free(arg),
2098 * we must not try to free(bb_msg_unknown) */
2099 if (G.cwd == bb_msg_unknown)
2100 G.cwd = NULL;
2101 G.cwd = xrealloc_getcwd_or_warn((char *)G.cwd);
2102 if (!G.cwd)
2103 G.cwd = bb_msg_unknown;
2104 }
Denis Vlasenko87a86552008-07-29 19:43:10 +00002105 return G.cwd;
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00002106}
2107
Denis Vlasenko83506862007-11-23 13:11:42 +00002108
Denys Vlasenkocb6ff252009-05-04 00:14:30 +02002109/*
2110 * Shell and environment variable support
2111 */
Denys Vlasenko27c56f12010-09-07 09:56:34 +02002112static struct variable **get_ptr_to_local_var(const char *name, unsigned len)
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002113{
Denys Vlasenkocb6ff252009-05-04 00:14:30 +02002114 struct variable **pp;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002115 struct variable *cur;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002116
Denys Vlasenkocb6ff252009-05-04 00:14:30 +02002117 pp = &G.top_var;
2118 while ((cur = *pp) != NULL) {
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002119 if (strncmp(cur->varstr, name, len) == 0 && cur->varstr[len] == '=')
Denys Vlasenkocb6ff252009-05-04 00:14:30 +02002120 return pp;
2121 pp = &cur->next;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002122 }
2123 return NULL;
2124}
2125
Denys Vlasenko03dad222010-01-12 23:29:57 +01002126static const char* FAST_FUNC get_local_var_value(const char *name)
Denys Vlasenkocb6ff252009-05-04 00:14:30 +02002127{
Denys Vlasenko29082232010-07-16 13:52:32 +02002128 struct variable **vpp;
Denys Vlasenko27c56f12010-09-07 09:56:34 +02002129 unsigned len = strlen(name);
Denys Vlasenko29082232010-07-16 13:52:32 +02002130
2131 if (G.expanded_assignments) {
2132 char **cpp = G.expanded_assignments;
Denys Vlasenko29082232010-07-16 13:52:32 +02002133 while (*cpp) {
2134 char *cp = *cpp;
2135 if (strncmp(cp, name, len) == 0 && cp[len] == '=')
2136 return cp + len + 1;
2137 cpp++;
2138 }
2139 }
2140
Denys Vlasenko27c56f12010-09-07 09:56:34 +02002141 vpp = get_ptr_to_local_var(name, len);
Denys Vlasenko29082232010-07-16 13:52:32 +02002142 if (vpp)
Denys Vlasenko27c56f12010-09-07 09:56:34 +02002143 return (*vpp)->varstr + len + 1;
Denys Vlasenko29082232010-07-16 13:52:32 +02002144
Denys Vlasenkodea47882009-10-09 15:40:49 +02002145 if (strcmp(name, "PPID") == 0)
2146 return utoa(G.root_ppid);
2147 // bash compat: UID? EUID?
Denys Vlasenko20b3d142009-10-09 20:59:39 +02002148#if ENABLE_HUSH_RANDOM_SUPPORT
Denys Vlasenko27c56f12010-09-07 09:56:34 +02002149 if (strcmp(name, "RANDOM") == 0)
Denys Vlasenko20b3d142009-10-09 20:59:39 +02002150 return utoa(next_random(&G.random_gen));
2151#endif
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002152 return NULL;
2153}
2154
Denys Vlasenkocf079ff2018-04-06 14:50:12 +02002155static void handle_changed_special_names(const char *name, unsigned name_len)
2156{
Denys Vlasenkof5018da2018-04-06 17:58:21 +02002157 if (ENABLE_HUSH_INTERACTIVE && ENABLE_FEATURE_EDITING_FANCY_PROMPT
2158 && name_len == 3 && name[0] == 'P' && name[1] == 'S'
2159 ) {
Denys Vlasenkocf079ff2018-04-06 14:50:12 +02002160 cmdedit_update_prompt();
2161 return;
2162 }
2163
2164 if ((ENABLE_HUSH_LINENO_VAR || ENABLE_HUSH_GETOPTS)
2165 && name_len == 6
2166 ) {
2167#if ENABLE_HUSH_LINENO_VAR
Denys Vlasenko00bd7672018-04-06 14:57:53 +02002168 if (strncmp(name, "LINENO", 6) == 0) {
Denys Vlasenkocf079ff2018-04-06 14:50:12 +02002169 G.lineno_var = NULL;
Denys Vlasenko00bd7672018-04-06 14:57:53 +02002170 return;
2171 }
Denys Vlasenkocf079ff2018-04-06 14:50:12 +02002172#endif
2173#if ENABLE_HUSH_GETOPTS
Denys Vlasenko00bd7672018-04-06 14:57:53 +02002174 if (strncmp(name, "OPTIND", 6) == 0) {
Denys Vlasenkocf079ff2018-04-06 14:50:12 +02002175 G.getopt_count = 0;
Denys Vlasenko00bd7672018-04-06 14:57:53 +02002176 return;
2177 }
Denys Vlasenkocf079ff2018-04-06 14:50:12 +02002178#endif
2179 }
2180}
2181
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002182/* str holds "NAME=VAL" and is expected to be malloced.
Mike Frysinger6379bb42009-03-28 18:55:03 +00002183 * We take ownership of it.
Mike Frysinger6379bb42009-03-28 18:55:03 +00002184 */
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02002185#define SETFLAG_EXPORT (1 << 0)
2186#define SETFLAG_UNEXPORT (1 << 1)
2187#define SETFLAG_MAKE_RO (1 << 2)
Denys Vlasenko332e4112018-04-04 22:32:59 +02002188#define SETFLAG_VARLVL_SHIFT 3
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02002189static int set_local_var(char *str, unsigned flags)
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002190{
Denys Vlasenko61407802018-04-04 21:14:28 +02002191 struct variable **cur_pp;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002192 struct variable *cur;
Denys Vlasenkoa7693902016-10-03 15:01:06 +02002193 char *free_me = NULL;
Denis Vlasenko950bd722009-04-21 11:23:56 +00002194 char *eq_sign;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002195 int name_len;
Denys Vlasenko332e4112018-04-04 22:32:59 +02002196 unsigned local_lvl = (flags >> SETFLAG_VARLVL_SHIFT);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002197
Denis Vlasenko950bd722009-04-21 11:23:56 +00002198 eq_sign = strchr(str, '=');
Denys Vlasenko929a41d2018-04-05 14:09:14 +02002199 if (HUSH_DEBUG && !eq_sign)
2200 bb_error_msg_and_die("BUG in setvar");
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002201
Denis Vlasenko950bd722009-04-21 11:23:56 +00002202 name_len = eq_sign - str + 1; /* including '=' */
Denys Vlasenko61407802018-04-04 21:14:28 +02002203 cur_pp = &G.top_var;
2204 while ((cur = *cur_pp) != NULL) {
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002205 if (strncmp(cur->varstr, str, name_len) != 0) {
Denys Vlasenko61407802018-04-04 21:14:28 +02002206 cur_pp = &cur->next;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002207 continue;
2208 }
Denys Vlasenkoa7693902016-10-03 15:01:06 +02002209
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002210 /* We found an existing var with this name */
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002211 if (cur->flg_read_only) {
Denys Vlasenko6b48e1f2017-07-17 21:31:17 +02002212 bb_error_msg("%s: readonly variable", str);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002213 free(str);
Denys Vlasenko5b2cc0a2017-07-18 02:44:06 +02002214//NOTE: in bash, assignment in "export READONLY_VAR=Z" fails, and sets $?=1,
2215//but export per se succeeds (does put the var in env). We don't mimic that.
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002216 return -1;
2217 }
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02002218 if (flags & SETFLAG_UNEXPORT) { // && cur->flg_export ?
Denis Vlasenko950bd722009-04-21 11:23:56 +00002219 debug_printf_env("%s: unsetenv '%s'\n", __func__, str);
2220 *eq_sign = '\0';
2221 unsetenv(str);
2222 *eq_sign = '=';
2223 }
Denys Vlasenko332e4112018-04-04 22:32:59 +02002224 if (cur->var_nest_level < local_lvl) {
Denys Vlasenko295fef82009-06-03 12:47:26 +02002225 /* bash 3.2.33(1) and exported vars:
2226 * # export z=z
2227 * # f() { local z=a; env | grep ^z; }
2228 * # f
2229 * z=a
2230 * # env | grep ^z
2231 * z=z
2232 */
2233 if (cur->flg_export)
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02002234 flags |= SETFLAG_EXPORT;
Denys Vlasenko929a41d2018-04-05 14:09:14 +02002235 /* New variable is local ("local VAR=VAL" or
2236 * "VAR=VAL cmd")
2237 * and existing one is global, or local
2238 * on a lower level that new one.
2239 * Remove it from global variable list:
2240 */
2241 *cur_pp = cur->next;
2242 if (G.shadowed_vars_pp) {
2243 /* Save in "shadowed" list */
2244 debug_printf_env("shadowing %s'%s'/%u by '%s'/%u\n",
2245 cur->flg_export ? "exported " : "",
2246 cur->varstr, cur->var_nest_level, str, local_lvl
2247 );
2248 cur->next = *G.shadowed_vars_pp;
2249 *G.shadowed_vars_pp = cur;
2250 } else {
2251 /* Came from pseudo_exec_argv(), no need to save: delete it */
2252 debug_printf_env("shadow-deleting %s'%s'/%u by '%s'/%u\n",
2253 cur->flg_export ? "exported " : "",
2254 cur->varstr, cur->var_nest_level, str, local_lvl
2255 );
2256 if (cur->max_len == 0) /* allocated "VAR=VAL"? */
2257 free_me = cur->varstr; /* then free it later */
2258 free(cur);
2259 }
Denys Vlasenko295fef82009-06-03 12:47:26 +02002260 break;
2261 }
Denys Vlasenko332e4112018-04-04 22:32:59 +02002262
Denis Vlasenko950bd722009-04-21 11:23:56 +00002263 if (strcmp(cur->varstr + name_len, eq_sign + 1) == 0) {
Denys Vlasenkod358b0b2018-04-05 00:51:55 +02002264 debug_printf_env("assignement '%s' does not change anything\n", str);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002265 free_and_exp:
2266 free(str);
2267 goto exp;
2268 }
Denys Vlasenko929a41d2018-04-05 14:09:14 +02002269
2270 /* Replace the value in the found "struct variable" */
Denys Vlasenko295fef82009-06-03 12:47:26 +02002271 if (cur->max_len != 0) {
Denys Vlasenko929a41d2018-04-05 14:09:14 +02002272 if (cur->max_len >= strnlen(str, cur->max_len + 1)) {
Denys Vlasenko295fef82009-06-03 12:47:26 +02002273 /* This one is from startup env, reuse space */
Denys Vlasenkod358b0b2018-04-05 00:51:55 +02002274 debug_printf_env("reusing startup env for '%s'\n", str);
Denys Vlasenko295fef82009-06-03 12:47:26 +02002275 strcpy(cur->varstr, str);
2276 goto free_and_exp;
2277 }
Denys Vlasenkoa7693902016-10-03 15:01:06 +02002278 /* Can't reuse */
2279 cur->max_len = 0;
2280 goto set_str_and_exp;
Denys Vlasenko295fef82009-06-03 12:47:26 +02002281 }
Denys Vlasenkoa7693902016-10-03 15:01:06 +02002282 /* max_len == 0 signifies "malloced" var, which we can
2283 * (and have to) free. But we can't free(cur->varstr) here:
2284 * if cur->flg_export is 1, it is in the environment.
2285 * We should either unsetenv+free, or wait until putenv,
2286 * then putenv(new)+free(old).
2287 */
2288 free_me = cur->varstr;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002289 goto set_str_and_exp;
2290 }
2291
Denys Vlasenkod358b0b2018-04-05 00:51:55 +02002292 /* Not found or shadowed - create new variable struct */
Denys Vlasenko9db344a2018-04-09 19:05:11 +02002293 debug_printf_env("%s: alloc new var '%s'/%u\n", __func__, str, local_lvl);
Denys Vlasenko295fef82009-06-03 12:47:26 +02002294 cur = xzalloc(sizeof(*cur));
Denys Vlasenko332e4112018-04-04 22:32:59 +02002295 cur->var_nest_level = local_lvl;
Denys Vlasenko61407802018-04-04 21:14:28 +02002296 cur->next = *cur_pp;
2297 *cur_pp = cur;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002298
2299 set_str_and_exp:
2300 cur->varstr = str;
2301 exp:
Denys Vlasenko1e660422017-07-17 21:10:50 +02002302#if !BB_MMU || ENABLE_HUSH_READONLY
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02002303 if (flags & SETFLAG_MAKE_RO) {
2304 cur->flg_read_only = 1;
Denys Vlasenko1e660422017-07-17 21:10:50 +02002305 }
2306#endif
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02002307 if (flags & SETFLAG_EXPORT)
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002308 cur->flg_export = 1;
2309 if (cur->flg_export) {
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02002310 if (flags & SETFLAG_UNEXPORT) {
Denis Vlasenkoad4bd052009-04-20 22:04:21 +00002311 cur->flg_export = 0;
2312 /* unsetenv was already done */
2313 } else {
Denys Vlasenkoa7693902016-10-03 15:01:06 +02002314 int i;
Denys Vlasenkod358b0b2018-04-05 00:51:55 +02002315 debug_printf_env("%s: putenv '%s'/%u\n", __func__, cur->varstr, cur->var_nest_level);
Denys Vlasenkoa7693902016-10-03 15:01:06 +02002316 i = putenv(cur->varstr);
2317 /* only now we can free old exported malloced string */
2318 free(free_me);
2319 return i;
Denis Vlasenkoad4bd052009-04-20 22:04:21 +00002320 }
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002321 }
Denys Vlasenkoa7693902016-10-03 15:01:06 +02002322 free(free_me);
Denys Vlasenko929a41d2018-04-05 14:09:14 +02002323
Denys Vlasenkocf079ff2018-04-06 14:50:12 +02002324 handle_changed_special_names(cur->varstr, name_len - 1);
Denys Vlasenko929a41d2018-04-05 14:09:14 +02002325
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002326 return 0;
2327}
2328
Denys Vlasenko6db47842009-09-05 20:15:17 +02002329/* Used at startup and after each cd */
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02002330static void set_pwd_var(unsigned flag)
Denys Vlasenko6db47842009-09-05 20:15:17 +02002331{
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02002332 set_local_var(xasprintf("PWD=%s", get_cwd(/*force:*/ 1)), flag);
Denys Vlasenko6db47842009-09-05 20:15:17 +02002333}
2334
Denys Vlasenkoacdc49c2009-05-04 01:58:10 +02002335static int unset_local_var_len(const char *name, int name_len)
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002336{
2337 struct variable *cur;
Denys Vlasenko61407802018-04-04 21:14:28 +02002338 struct variable **cur_pp;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002339
Denys Vlasenko61407802018-04-04 21:14:28 +02002340 cur_pp = &G.top_var;
2341 while ((cur = *cur_pp) != NULL) {
Denys Vlasenkocf079ff2018-04-06 14:50:12 +02002342 if (strncmp(cur->varstr, name, name_len) == 0
2343 && cur->varstr[name_len] == '='
2344 ) {
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002345 if (cur->flg_read_only) {
2346 bb_error_msg("%s: readonly variable", name);
Mike Frysingerd690f682009-03-30 06:50:54 +00002347 return EXIT_FAILURE;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002348 }
Denys Vlasenkocf079ff2018-04-06 14:50:12 +02002349
Denys Vlasenko61407802018-04-04 21:14:28 +02002350 *cur_pp = cur->next;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002351 debug_printf_env("%s: unsetenv '%s'\n", __func__, cur->varstr);
2352 bb_unsetenv(cur->varstr);
2353 if (!cur->max_len)
2354 free(cur->varstr);
2355 free(cur);
Denys Vlasenkocf079ff2018-04-06 14:50:12 +02002356
Denys Vlasenkof5018da2018-04-06 17:58:21 +02002357 break;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002358 }
Denys Vlasenko61407802018-04-04 21:14:28 +02002359 cur_pp = &cur->next;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002360 }
Denys Vlasenkof5018da2018-04-06 17:58:21 +02002361
2362 /* Handle "unset PS1" et al even if did not find the variable to unset */
2363 handle_changed_special_names(name, name_len);
2364
Mike Frysingerd690f682009-03-30 06:50:54 +00002365 return EXIT_SUCCESS;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002366}
2367
Denys Vlasenko82d1c1f2017-12-31 17:30:02 +01002368#if ENABLE_HUSH_UNSET || ENABLE_HUSH_GETOPTS
Denys Vlasenkoacdc49c2009-05-04 01:58:10 +02002369static int unset_local_var(const char *name)
2370{
2371 return unset_local_var_len(name, strlen(name));
2372}
Denys Vlasenko10d5ece2017-01-08 18:28:43 +01002373#endif
Denys Vlasenkoacdc49c2009-05-04 01:58:10 +02002374
Denys Vlasenko82d1c1f2017-12-31 17:30:02 +01002375#if BASH_HOSTNAME_VAR || ENABLE_FEATURE_SH_MATH || ENABLE_HUSH_READ || ENABLE_HUSH_GETOPTS
Denys Vlasenko03dad222010-01-12 23:29:57 +01002376static void FAST_FUNC set_local_var_from_halves(const char *name, const char *val)
Mike Frysinger98c52642009-04-02 10:02:37 +00002377{
Denis Vlasenkob29eb6e2009-04-02 13:46:27 +00002378 char *var = xasprintf("%s=%s", name, val);
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02002379 set_local_var(var, /*flag:*/ 0);
Mike Frysinger98c52642009-04-02 10:02:37 +00002380}
Denys Vlasenkocc2fd5a2017-01-09 06:19:55 +01002381#endif
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002382
Denis Vlasenkob29eb6e2009-04-02 13:46:27 +00002383
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002384/*
Denys Vlasenkocb6ff252009-05-04 00:14:30 +02002385 * Helpers for "var1=val1 var2=val2 cmd" feature
2386 */
2387static void add_vars(struct variable *var)
2388{
2389 struct variable *next;
2390
2391 while (var) {
2392 next = var->next;
2393 var->next = G.top_var;
2394 G.top_var = var;
Denys Vlasenkoacdc49c2009-05-04 01:58:10 +02002395 if (var->flg_export) {
Denys Vlasenkod358b0b2018-04-05 00:51:55 +02002396 debug_printf_env("%s: restoring exported '%s'/%u\n", __func__, var->varstr, var->var_nest_level);
Denys Vlasenkocb6ff252009-05-04 00:14:30 +02002397 putenv(var->varstr);
Denys Vlasenkoacdc49c2009-05-04 01:58:10 +02002398 } else {
Denys Vlasenkod358b0b2018-04-05 00:51:55 +02002399 debug_printf_env("%s: restoring variable '%s'/%u\n", __func__, var->varstr, var->var_nest_level);
Denys Vlasenkoacdc49c2009-05-04 01:58:10 +02002400 }
Denys Vlasenkocb6ff252009-05-04 00:14:30 +02002401 var = next;
2402 }
2403}
2404
Denys Vlasenkod358b0b2018-04-05 00:51:55 +02002405/* We put strings[i] into variable table and possibly putenv them.
2406 * If variable is read only, we can free the strings[i]
2407 * which attempts to overwrite it.
2408 * The strings[] vector itself is freed.
2409 */
Denys Vlasenko929a41d2018-04-05 14:09:14 +02002410static void set_vars_and_save_old(char **strings)
Denys Vlasenkocb6ff252009-05-04 00:14:30 +02002411{
2412 char **s;
Denys Vlasenkocb6ff252009-05-04 00:14:30 +02002413
2414 if (!strings)
Denys Vlasenko929a41d2018-04-05 14:09:14 +02002415 return;
Denys Vlasenkod358b0b2018-04-05 00:51:55 +02002416
Denys Vlasenkocb6ff252009-05-04 00:14:30 +02002417 s = strings;
2418 while (*s) {
2419 struct variable *var_p;
2420 struct variable **var_pp;
2421 char *eq;
2422
2423 eq = strchr(*s, '=');
2424 if (eq) {
Denys Vlasenko27c56f12010-09-07 09:56:34 +02002425 var_pp = get_ptr_to_local_var(*s, eq - *s);
Denys Vlasenkocb6ff252009-05-04 00:14:30 +02002426 if (var_pp) {
Denys Vlasenkocb6ff252009-05-04 00:14:30 +02002427 var_p = *var_pp;
Denys Vlasenko5b2cc0a2017-07-18 02:44:06 +02002428 if (var_p->flg_read_only) {
Denys Vlasenkocf511092017-07-18 15:58:02 +02002429 char **p;
Denys Vlasenko5b2cc0a2017-07-18 02:44:06 +02002430 bb_error_msg("%s: readonly variable", *s);
Denys Vlasenkocf511092017-07-18 15:58:02 +02002431 /*
2432 * "VAR=V BLTIN" unsets VARs after BLTIN completes.
2433 * If VAR is readonly, leaving it in the list
2434 * after asssignment error (msg above)
2435 * causes doubled error message later, on unset.
2436 */
2437 debug_printf_env("removing/freeing '%s' element\n", *s);
2438 free(*s);
2439 p = s;
2440 do { *p = p[1]; p++; } while (*p);
Denys Vlasenko5b2cc0a2017-07-18 02:44:06 +02002441 goto next;
2442 }
Denys Vlasenko929a41d2018-04-05 14:09:14 +02002443 /* below, set_local_var() with nest level will
2444 * "shadow" (remove) this variable from
2445 * global linked list.
2446 */
Denys Vlasenkocb6ff252009-05-04 00:14:30 +02002447 }
Denys Vlasenko9db344a2018-04-09 19:05:11 +02002448 debug_printf_env("%s: env override '%s'/%u\n", __func__, *s, G.var_nest_level);
Denys Vlasenkod358b0b2018-04-05 00:51:55 +02002449 set_local_var(*s, (G.var_nest_level << SETFLAG_VARLVL_SHIFT) | SETFLAG_EXPORT);
2450 } else if (HUSH_DEBUG) {
2451 bb_error_msg_and_die("BUG in varexp4");
Denys Vlasenkocb6ff252009-05-04 00:14:30 +02002452 }
2453 s++;
Denys Vlasenko61407802018-04-04 21:14:28 +02002454 next: ;
Denys Vlasenkocb6ff252009-05-04 00:14:30 +02002455 }
Denys Vlasenkod358b0b2018-04-05 00:51:55 +02002456 free(strings);
Denys Vlasenkocb6ff252009-05-04 00:14:30 +02002457}
2458
2459
2460/*
Denys Vlasenkoc538d5b2014-08-13 09:57:44 +02002461 * Unicode helper
2462 */
2463static void reinit_unicode_for_hush(void)
2464{
2465 /* Unicode support should be activated even if LANG is set
2466 * _during_ shell execution, not only if it was set when
2467 * shell was started. Therefore, re-check LANG every time:
2468 */
Denys Vlasenko841f8332014-08-13 10:09:49 +02002469 if (ENABLE_FEATURE_CHECK_UNICODE_IN_ENV
2470 || ENABLE_UNICODE_USING_LOCALE
2471 ) {
2472 const char *s = get_local_var_value("LC_ALL");
2473 if (!s) s = get_local_var_value("LC_CTYPE");
2474 if (!s) s = get_local_var_value("LANG");
2475 reinit_unicode(s);
2476 }
Denys Vlasenkoc538d5b2014-08-13 09:57:44 +02002477}
2478
Denys Vlasenkoc538d5b2014-08-13 09:57:44 +02002479/*
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002480 * in_str support (strings, and "strings" read from files).
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002481 */
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002482
2483#if ENABLE_HUSH_INTERACTIVE
Denys Vlasenko4074d492016-09-30 01:49:53 +02002484/* To test correct lineedit/interactive behavior, type from command line:
2485 * echo $P\
2486 * \
2487 * AT\
2488 * H\
2489 * \
Denys Vlasenko10ad6222017-04-17 16:13:32 +02002490 * It exercises a lot of corner cases.
Denys Vlasenko4074d492016-09-30 01:49:53 +02002491 */
Denys Vlasenkof5018da2018-04-06 17:58:21 +02002492# if ENABLE_FEATURE_EDITING_FANCY_PROMPT
Mike Frysinger67c1c7b2009-04-24 06:26:18 +00002493static void cmdedit_update_prompt(void)
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002494{
Denys Vlasenkof5018da2018-04-06 17:58:21 +02002495 G.PS1 = get_local_var_value("PS1");
2496 if (G.PS1 == NULL)
2497 G.PS1 = "";
2498 G.PS2 = get_local_var_value("PS2");
Mike Frysinger67c1c7b2009-04-24 06:26:18 +00002499 if (G.PS2 == NULL)
Denys Vlasenkof5018da2018-04-06 17:58:21 +02002500 G.PS2 = "";
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002501}
Denys Vlasenkof5018da2018-04-06 17:58:21 +02002502# endif
Denys Vlasenko8d6eab32018-04-07 17:01:31 +02002503static const char *setup_prompt_string(void)
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002504{
2505 const char *prompt_str;
Denys Vlasenkof5018da2018-04-06 17:58:21 +02002506
Denys Vlasenko8d6eab32018-04-07 17:01:31 +02002507 debug_printf_prompt("%s promptmode:%d\n", __func__, G.promptmode);
Denys Vlasenkof5018da2018-04-06 17:58:21 +02002508
2509 IF_FEATURE_EDITING_FANCY_PROMPT( prompt_str = G.PS2;)
2510 IF_NOT_FEATURE_EDITING_FANCY_PROMPT(prompt_str = "> ";)
Denys Vlasenko8d6eab32018-04-07 17:01:31 +02002511 if (G.promptmode == 0) { /* PS1 */
Denys Vlasenkof5018da2018-04-06 17:58:21 +02002512 if (!ENABLE_FEATURE_EDITING_FANCY_PROMPT) {
2513 /* No fancy prompts supported, (re)generate "CURDIR $ " by hand */
Mike Frysingerec2c6552009-03-28 12:24:44 +00002514 free((char*)G.PS1);
Denys Vlasenko6db47842009-09-05 20:15:17 +02002515 /* bash uses $PWD value, even if it is set by user.
2516 * It uses current dir only if PWD is unset.
2517 * We always use current dir. */
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02002518 G.PS1 = xasprintf("%s %c ", get_cwd(0), (geteuid() != 0) ? '$' : '#');
Denys Vlasenkof5018da2018-04-06 17:58:21 +02002519 }
2520 prompt_str = G.PS1;
2521 }
Denys Vlasenko4074d492016-09-30 01:49:53 +02002522 debug_printf("prompt_str '%s'\n", prompt_str);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002523 return prompt_str;
2524}
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002525static int get_user_input(struct in_str *i)
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002526{
2527 int r;
2528 const char *prompt_str;
2529
Denys Vlasenko8d6eab32018-04-07 17:01:31 +02002530 prompt_str = setup_prompt_string();
Denys Vlasenko8391c482010-05-22 17:50:43 +02002531# if ENABLE_FEATURE_EDITING
Denys Vlasenko8660aeb2016-11-24 17:44:02 +01002532 for (;;) {
Denys Vlasenkoc538d5b2014-08-13 09:57:44 +02002533 reinit_unicode_for_hush();
Denys Vlasenko4b89d512016-11-25 03:41:03 +01002534 if (G.flag_SIGINT) {
2535 /* There was ^C'ed, make it look prettier: */
2536 bb_putchar('\n');
2537 G.flag_SIGINT = 0;
2538 }
Denis Vlasenko422cd7c2009-03-31 12:41:52 +00002539 /* buglet: SIGINT will not make new prompt to appear _at once_,
Denys Vlasenko4b89d512016-11-25 03:41:03 +01002540 * only after <Enter>. (^C works immediately) */
Denys Vlasenko0448c552016-09-29 20:25:44 +02002541 r = read_line_input(G.line_input_state, prompt_str,
Denys Vlasenko84ea60e2017-08-02 17:27:28 +02002542 G.user_input_buf, CONFIG_FEATURE_EDITING_MAX_LEN-1
Denys Vlasenko0448c552016-09-29 20:25:44 +02002543 );
Denys Vlasenko4b89d512016-11-25 03:41:03 +01002544 /* read_line_input intercepts ^C, "convert" it to SIGINT */
Denys Vlasenkodd4b4462017-08-02 16:52:12 +02002545 if (r == 0)
Denys Vlasenko8660aeb2016-11-24 17:44:02 +01002546 raise(SIGINT);
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02002547 check_and_run_traps();
Denys Vlasenko8660aeb2016-11-24 17:44:02 +01002548 if (r != 0 && !G.flag_SIGINT)
2549 break;
2550 /* ^C or SIGINT: repeat */
Denys Vlasenkodd4b4462017-08-02 16:52:12 +02002551 /* bash prints ^C even on real SIGINT (non-kbd generated) */
2552 write(STDOUT_FILENO, "^C", 2);
Denys Vlasenko8660aeb2016-11-24 17:44:02 +01002553 G.last_exitcode = 128 + SIGINT;
2554 }
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002555 if (r < 0) {
2556 /* EOF/error detected */
Denys Vlasenko4074d492016-09-30 01:49:53 +02002557 i->p = NULL;
2558 i->peek_buf[0] = r = EOF;
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002559 return r;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002560 }
Denys Vlasenko4074d492016-09-30 01:49:53 +02002561 i->p = G.user_input_buf;
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002562 return (unsigned char)*i->p++;
Denys Vlasenko8391c482010-05-22 17:50:43 +02002563# else
Denys Vlasenko8660aeb2016-11-24 17:44:02 +01002564 for (;;) {
Denis Vlasenko422cd7c2009-03-31 12:41:52 +00002565 G.flag_SIGINT = 0;
Denys Vlasenkob8709032011-05-08 21:20:01 +02002566 if (i->last_char == '\0' || i->last_char == '\n') {
2567 /* Why check_and_run_traps here? Try this interactively:
2568 * $ trap 'echo INT' INT; (sleep 2; kill -INT $$) &
2569 * $ <[enter], repeatedly...>
2570 * Without check_and_run_traps, handler never runs.
2571 */
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02002572 check_and_run_traps();
Denys Vlasenkob8709032011-05-08 21:20:01 +02002573 fputs(prompt_str, stdout);
2574 }
Denys Vlasenko8131eea2009-11-02 14:19:51 +01002575 fflush_all();
Denys Vlasenko4b89d512016-11-25 03:41:03 +01002576//FIXME: here ^C or SIGINT will have effect only after <Enter>
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002577 r = fgetc(i->file);
Denys Vlasenko8660aeb2016-11-24 17:44:02 +01002578 /* In !ENABLE_FEATURE_EDITING we don't use read_line_input,
2579 * no ^C masking happens during fgetc, no special code for ^C:
2580 * it generates SIGINT as usual.
2581 */
2582 check_and_run_traps();
2583 if (G.flag_SIGINT)
2584 G.last_exitcode = 128 + SIGINT;
2585 if (r != '\0')
2586 break;
2587 }
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002588 return r;
Denys Vlasenko8391c482010-05-22 17:50:43 +02002589# endif
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002590}
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002591/* This is the magic location that prints prompts
2592 * and gets data back from the user */
Denys Vlasenko4074d492016-09-30 01:49:53 +02002593static int fgetc_interactive(struct in_str *i)
2594{
2595 int ch;
2596 /* If it's interactive stdin, get new line. */
2597 if (G_interactive_fd && i->file == stdin) {
2598 /* Returns first char (or EOF), the rest is in i->p[] */
2599 ch = get_user_input(i);
Denys Vlasenko8d6eab32018-04-07 17:01:31 +02002600 G.promptmode = 1; /* PS2 */
2601 debug_printf_prompt("%s promptmode=%d\n", __func__, G.promptmode);
Denys Vlasenko4074d492016-09-30 01:49:53 +02002602 } else {
2603 /* Not stdin: script file, sourced file, etc */
2604 do ch = fgetc(i->file); while (ch == '\0');
2605 }
2606 return ch;
2607}
2608#else
2609static inline int fgetc_interactive(struct in_str *i)
2610{
2611 int ch;
2612 do ch = fgetc(i->file); while (ch == '\0');
2613 return ch;
2614}
2615#endif /* INTERACTIVE */
2616
Denys Vlasenko87e039d2016-11-08 22:35:05 +01002617static int i_getch(struct in_str *i)
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002618{
2619 int ch;
2620
Denys Vlasenko87e039d2016-11-08 22:35:05 +01002621 if (!i->file) {
2622 /* string-based in_str */
2623 ch = (unsigned char)*i->p;
2624 if (ch != '\0') {
2625 i->p++;
2626 i->last_char = ch;
2627 return ch;
2628 }
2629 return EOF;
2630 }
2631
2632 /* FILE-based in_str */
2633
Denys Vlasenko4074d492016-09-30 01:49:53 +02002634#if ENABLE_FEATURE_EDITING
2635 /* This can be stdin, check line editing char[] buffer */
2636 if (i->p && *i->p != '\0') {
2637 ch = (unsigned char)*i->p++;
2638 goto out;
2639 }
2640#endif
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002641 /* peek_buf[] is an int array, not char. Can contain EOF. */
2642 ch = i->peek_buf[0];
Denys Vlasenko4074d492016-09-30 01:49:53 +02002643 if (ch != 0) {
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002644 int ch2 = i->peek_buf[1];
2645 i->peek_buf[0] = ch2;
2646 if (ch2 == 0) /* very likely, avoid redundant write */
2647 goto out;
2648 i->peek_buf[1] = 0;
2649 goto out;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002650 }
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002651
Denys Vlasenko4074d492016-09-30 01:49:53 +02002652 ch = fgetc_interactive(i);
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002653 out:
Denis Vlasenko913a2012009-04-05 22:17:04 +00002654 debug_printf("file_get: got '%c' %d\n", ch, ch);
Denys Vlasenkocecbc982011-03-30 18:54:52 +02002655 i->last_char = ch;
Denys Vlasenko5807e182018-02-08 19:19:04 +01002656#if ENABLE_HUSH_LINENO_VAR
2657 if (ch == '\n') {
Denys Vlasenko6aad1dd2018-01-19 15:37:04 +01002658 G.lineno++;
Denys Vlasenko5807e182018-02-08 19:19:04 +01002659 debug_printf_parse("G.lineno++ = %u\n", G.lineno);
2660 }
Denys Vlasenko6aad1dd2018-01-19 15:37:04 +01002661#endif
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002662 return ch;
2663}
2664
Denys Vlasenko87e039d2016-11-08 22:35:05 +01002665static int i_peek(struct in_str *i)
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002666{
2667 int ch;
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002668
Denys Vlasenko87e039d2016-11-08 22:35:05 +01002669 if (!i->file) {
2670 /* string-based in_str */
2671 /* Doesn't report EOF on NUL. None of the callers care. */
2672 return (unsigned char)*i->p;
2673 }
2674
2675 /* FILE-based in_str */
2676
Denys Vlasenko4074d492016-09-30 01:49:53 +02002677#if ENABLE_FEATURE_EDITING && ENABLE_HUSH_INTERACTIVE
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002678 /* This can be stdin, check line editing char[] buffer */
2679 if (i->p && *i->p != '\0')
2680 return (unsigned char)*i->p;
2681#endif
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002682 /* peek_buf[] is an int array, not char. Can contain EOF. */
2683 ch = i->peek_buf[0];
Denys Vlasenko4074d492016-09-30 01:49:53 +02002684 if (ch != 0)
2685 return ch;
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002686
Denys Vlasenko4074d492016-09-30 01:49:53 +02002687 /* Need to get a new char */
2688 ch = fgetc_interactive(i);
2689 debug_printf("file_peek: got '%c' %d\n", ch, ch);
2690
2691 /* Save it by either rolling back line editing buffer, or in i->peek_buf[0] */
2692#if ENABLE_FEATURE_EDITING && ENABLE_HUSH_INTERACTIVE
2693 if (i->p) {
2694 i->p -= 1;
2695 return ch;
2696 }
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002697#endif
Denys Vlasenko4074d492016-09-30 01:49:53 +02002698 i->peek_buf[0] = ch;
2699 /*i->peek_buf[1] = 0; - already is */
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002700 return ch;
2701}
2702
Denys Vlasenko4074d492016-09-30 01:49:53 +02002703/* Only ever called if i_peek() was called, and did not return EOF.
2704 * IOW: we know the previous peek saw an ordinary char, not EOF, not NUL,
2705 * not end-of-line. Therefore we never need to read a new editing line here.
2706 */
2707static int i_peek2(struct in_str *i)
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002708{
Denys Vlasenko4074d492016-09-30 01:49:53 +02002709 int ch;
2710
2711 /* There are two cases when i->p[] buffer exists.
2712 * (1) it's a string in_str.
Denys Vlasenko08755f92016-09-30 02:02:25 +02002713 * (2) It's a file, and we have a saved line editing buffer.
Denys Vlasenko4074d492016-09-30 01:49:53 +02002714 * In both cases, we know that i->p[0] exists and not NUL, and
2715 * the peek2 result is in i->p[1].
2716 */
2717 if (i->p)
2718 return (unsigned char)i->p[1];
2719
2720 /* Now we know it is a file-based in_str. */
2721
2722 /* peek_buf[] is an int array, not char. Can contain EOF. */
2723 /* Is there 2nd char? */
2724 ch = i->peek_buf[1];
2725 if (ch == 0) {
2726 /* We did not read it yet, get it now */
2727 do ch = fgetc(i->file); while (ch == '\0');
2728 i->peek_buf[1] = ch;
2729 }
2730
2731 debug_printf("file_peek2: got '%c' %d\n", ch, ch);
2732 return ch;
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002733}
2734
Denys Vlasenkoa94eeb02018-03-31 20:16:31 +02002735static int i_getch_and_eat_bkslash_nl(struct in_str *input)
2736{
2737 for (;;) {
2738 int ch, ch2;
2739
2740 ch = i_getch(input);
2741 if (ch != '\\')
2742 return ch;
2743 ch2 = i_peek(input);
2744 if (ch2 != '\n')
2745 return ch;
2746 /* backslash+newline, skip it */
2747 i_getch(input);
2748 }
2749}
2750
2751/* Note: this function _eats_ \<newline> pairs, safe to use plain
2752 * i_getch() after it instead of i_getch_and_eat_bkslash_nl().
2753 */
2754static int i_peek_and_eat_bkslash_nl(struct in_str *input)
2755{
2756 for (;;) {
2757 int ch, ch2;
2758
2759 ch = i_peek(input);
2760 if (ch != '\\')
2761 return ch;
2762 ch2 = i_peek2(input);
2763 if (ch2 != '\n')
2764 return ch;
2765 /* backslash+newline, skip it */
2766 i_getch(input);
2767 i_getch(input);
2768 }
2769}
2770
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002771static void setup_file_in_str(struct in_str *i, FILE *f)
2772{
Denys Vlasenkoa1463192011-01-18 17:55:04 +01002773 memset(i, 0, sizeof(*i));
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002774 i->file = f;
Denys Vlasenkoa1463192011-01-18 17:55:04 +01002775 /* i->p = NULL; */
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002776}
2777
2778static void setup_string_in_str(struct in_str *i, const char *s)
2779{
Denys Vlasenkoa1463192011-01-18 17:55:04 +01002780 memset(i, 0, sizeof(*i));
Denys Vlasenko87e039d2016-11-08 22:35:05 +01002781 /*i->file = NULL */;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002782 i->p = s;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002783}
2784
2785
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00002786/*
2787 * o_string support
2788 */
2789#define B_CHUNK (32 * sizeof(char*))
Eric Andersen25f27032001-04-26 23:22:31 +00002790
Denis Vlasenko0b677d82009-04-10 13:49:10 +00002791static void o_reset_to_empty_unquoted(o_string *o)
Eric Andersen25f27032001-04-26 23:22:31 +00002792{
2793 o->length = 0;
Denys Vlasenko38292b62010-09-05 14:49:40 +02002794 o->has_quoted_part = 0;
Denis Vlasenkod65ea392007-10-01 10:02:25 +00002795 if (o->data)
2796 o->data[0] = '\0';
Eric Andersen25f27032001-04-26 23:22:31 +00002797}
2798
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00002799static void o_free(o_string *o)
Eric Andersen25f27032001-04-26 23:22:31 +00002800{
Aaron Lehmanna170e1c2002-11-28 11:27:31 +00002801 free(o->data);
Denis Vlasenkod65ea392007-10-01 10:02:25 +00002802 memset(o, 0, sizeof(*o));
Eric Andersen25f27032001-04-26 23:22:31 +00002803}
2804
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00002805static ALWAYS_INLINE void o_free_unsafe(o_string *o)
2806{
2807 free(o->data);
2808}
2809
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00002810static void o_grow_by(o_string *o, int len)
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00002811{
2812 if (o->length + len > o->maxlen) {
Denys Vlasenko46e64982016-09-29 19:50:55 +02002813 o->maxlen += (2 * len) | (B_CHUNK-1);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00002814 o->data = xrealloc(o->data, 1 + o->maxlen);
2815 }
2816}
2817
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00002818static void o_addchr(o_string *o, int ch)
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00002819{
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00002820 debug_printf("o_addchr: '%c' o->length=%d o=%p\n", ch, o->length, o);
Denys Vlasenko46e64982016-09-29 19:50:55 +02002821 if (o->length < o->maxlen) {
2822 /* likely. avoid o_grow_by() call */
2823 add:
2824 o->data[o->length] = ch;
2825 o->length++;
2826 o->data[o->length] = '\0';
2827 return;
2828 }
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00002829 o_grow_by(o, 1);
Denys Vlasenko46e64982016-09-29 19:50:55 +02002830 goto add;
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00002831}
2832
Denys Vlasenko657086a2016-09-29 18:07:42 +02002833#if 0
2834/* Valid only if we know o_string is not empty */
2835static void o_delchr(o_string *o)
2836{
2837 o->length--;
2838 o->data[o->length] = '\0';
2839}
2840#endif
2841
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00002842static void o_addblock(o_string *o, const char *str, int len)
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00002843{
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00002844 o_grow_by(o, len);
Denys Vlasenko0675b032017-07-24 02:17:05 +02002845 ((char*)mempcpy(&o->data[o->length], str, len))[0] = '\0';
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00002846 o->length += len;
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00002847}
2848
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00002849static void o_addstr(o_string *o, const char *str)
Mike Frysinger98c52642009-04-02 10:02:37 +00002850{
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00002851 o_addblock(o, str, strlen(str));
2852}
Denys Vlasenko2e48d532010-05-22 17:30:39 +02002853
Denys Vlasenko1e811b12010-05-22 03:12:29 +02002854#if !BB_MMU
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00002855static void nommu_addchr(o_string *o, int ch)
2856{
2857 if (o)
2858 o_addchr(o, ch);
2859}
2860#else
Denys Vlasenko28a105d2009-06-01 11:26:30 +02002861# define nommu_addchr(o, str) ((void)0)
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00002862#endif
2863
2864static void o_addstr_with_NUL(o_string *o, const char *str)
2865{
2866 o_addblock(o, str, strlen(str) + 1);
Mike Frysinger98c52642009-04-02 10:02:37 +00002867}
2868
Denys Vlasenkof3e28182009-11-17 03:35:31 +01002869/*
Denys Vlasenko238081f2010-10-03 14:26:26 +02002870 * HUSH_BRACE_EXPANSION code needs corresponding quoting on variable expansion side.
Denys Vlasenkof3e28182009-11-17 03:35:31 +01002871 * Currently, "v='{q,w}'; echo $v" erroneously expands braces in $v.
2872 * Apparently, on unquoted $v bash still does globbing
2873 * ("v='*.txt'; echo $v" prints all .txt files),
2874 * but NOT brace expansion! Thus, there should be TWO independent
2875 * quoting mechanisms on $v expansion side: one protects
2876 * $v from brace expansion, and other additionally protects "$v" against globbing.
2877 * We have only second one.
2878 */
2879
Denys Vlasenko9e800222010-10-03 14:28:04 +02002880#if ENABLE_HUSH_BRACE_EXPANSION
Denys Vlasenkof3e28182009-11-17 03:35:31 +01002881# define MAYBE_BRACES "{}"
2882#else
2883# define MAYBE_BRACES ""
2884#endif
2885
Eric Andersen25f27032001-04-26 23:22:31 +00002886/* My analysis of quoting semantics tells me that state information
2887 * is associated with a destination, not a source.
2888 */
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00002889static void o_addqchr(o_string *o, int ch)
Eric Andersen25f27032001-04-26 23:22:31 +00002890{
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00002891 int sz = 1;
Denys Vlasenkof3e28182009-11-17 03:35:31 +01002892 char *found = strchr("*?[\\" MAYBE_BRACES, ch);
Denis Vlasenko371de4a2008-10-14 12:43:13 +00002893 if (found)
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00002894 sz++;
Denis Vlasenko371de4a2008-10-14 12:43:13 +00002895 o_grow_by(o, sz);
2896 if (found) {
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00002897 o->data[o->length] = '\\';
2898 o->length++;
Eric Andersen25f27032001-04-26 23:22:31 +00002899 }
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00002900 o->data[o->length] = ch;
2901 o->length++;
2902 o->data[o->length] = '\0';
Eric Andersen25f27032001-04-26 23:22:31 +00002903}
2904
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00002905static void o_addQchr(o_string *o, int ch)
Denis Vlasenko87f40ba2008-06-10 22:39:37 +00002906{
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00002907 int sz = 1;
Denys Vlasenko5b686cb2010-09-08 13:44:34 +02002908 if ((o->o_expflags & EXP_FLAG_ESC_GLOB_CHARS)
2909 && strchr("*?[\\" MAYBE_BRACES, ch)
2910 ) {
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00002911 sz++;
2912 o->data[o->length] = '\\';
2913 o->length++;
2914 }
2915 o_grow_by(o, sz);
2916 o->data[o->length] = ch;
2917 o->length++;
2918 o->data[o->length] = '\0';
2919}
2920
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02002921static void o_addqblock(o_string *o, const char *str, int len)
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00002922{
Denis Vlasenko87f40ba2008-06-10 22:39:37 +00002923 while (len) {
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00002924 char ch;
2925 int sz;
Denys Vlasenkof3e28182009-11-17 03:35:31 +01002926 int ordinary_cnt = strcspn(str, "*?[\\" MAYBE_BRACES);
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00002927 if (ordinary_cnt > len) /* paranoia */
2928 ordinary_cnt = len;
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00002929 o_addblock(o, str, ordinary_cnt);
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00002930 if (ordinary_cnt == len)
Denys Vlasenko4fb53fb2011-08-01 14:06:20 +02002931 return; /* NUL is already added by o_addblock */
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00002932 str += ordinary_cnt;
Denis Vlasenko30c9cc52008-06-17 07:24:29 +00002933 len -= ordinary_cnt + 1; /* we are processing + 1 char below */
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00002934
Denis Vlasenko87f40ba2008-06-10 22:39:37 +00002935 ch = *str++;
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00002936 sz = 1;
Denys Vlasenkof3e28182009-11-17 03:35:31 +01002937 if (ch) { /* it is necessarily one of "*?[\\" MAYBE_BRACES */
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00002938 sz++;
2939 o->data[o->length] = '\\';
2940 o->length++;
Denis Vlasenko87f40ba2008-06-10 22:39:37 +00002941 }
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00002942 o_grow_by(o, sz);
2943 o->data[o->length] = ch;
2944 o->length++;
Denis Vlasenko87f40ba2008-06-10 22:39:37 +00002945 }
Denys Vlasenko4fb53fb2011-08-01 14:06:20 +02002946 o->data[o->length] = '\0';
Denis Vlasenko87f40ba2008-06-10 22:39:37 +00002947}
2948
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02002949static void o_addQblock(o_string *o, const char *str, int len)
2950{
Denys Vlasenko5b686cb2010-09-08 13:44:34 +02002951 if (!(o->o_expflags & EXP_FLAG_ESC_GLOB_CHARS)) {
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02002952 o_addblock(o, str, len);
2953 return;
2954 }
2955 o_addqblock(o, str, len);
2956}
2957
Denys Vlasenko38292b62010-09-05 14:49:40 +02002958static void o_addQstr(o_string *o, const char *str)
2959{
2960 o_addQblock(o, str, strlen(str));
2961}
2962
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00002963/* A special kind of o_string for $VAR and `cmd` expansion.
2964 * It contains char* list[] at the beginning, which is grown in 16 element
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00002965 * increments. Actual string data starts at the next multiple of 16 * (char*).
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00002966 * list[i] contains an INDEX (int!) into this string data.
2967 * It means that if list[] needs to grow, data needs to be moved higher up
2968 * but list[i]'s need not be modified.
2969 * NB: remembering how many list[i]'s you have there is crucial.
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00002970 * o_finalize_list() operation post-processes this structure - calculates
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00002971 * and stores actual char* ptrs in list[]. Oh, it NULL terminates it as well.
2972 */
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00002973#if DEBUG_EXPAND || DEBUG_GLOB
2974static void debug_print_list(const char *prefix, o_string *o, int n)
2975{
2976 char **list = (char**)o->data;
2977 int string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]);
2978 int i = 0;
Denis Vlasenko0701dca2009-04-11 10:38:47 +00002979
2980 indent();
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01002981 fdprintf(2, "%s: list:%p n:%d string_start:%d length:%d maxlen:%d glob:%d quoted:%d escape:%d\n",
Denys Vlasenko5b686cb2010-09-08 13:44:34 +02002982 prefix, list, n, string_start, o->length, o->maxlen,
2983 !!(o->o_expflags & EXP_FLAG_GLOB),
2984 o->has_quoted_part,
2985 !!(o->o_expflags & EXP_FLAG_ESC_GLOB_CHARS));
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00002986 while (i < n) {
Denis Vlasenko0701dca2009-04-11 10:38:47 +00002987 indent();
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01002988 fdprintf(2, " list[%d]=%d '%s' %p\n", i, (int)(uintptr_t)list[i],
2989 o->data + (int)(uintptr_t)list[i] + string_start,
2990 o->data + (int)(uintptr_t)list[i] + string_start);
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00002991 i++;
2992 }
2993 if (n) {
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01002994 const char *p = o->data + (int)(uintptr_t)list[n - 1] + string_start;
Denis Vlasenko0701dca2009-04-11 10:38:47 +00002995 indent();
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01002996 fdprintf(2, " total_sz:%ld\n", (long)((p + strlen(p) + 1) - o->data));
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00002997 }
2998}
2999#else
Denys Vlasenko28a105d2009-06-01 11:26:30 +02003000# define debug_print_list(prefix, o, n) ((void)0)
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00003001#endif
3002
3003/* n = o_save_ptr_helper(str, n) "starts new string" by storing an index value
3004 * in list[n] so that it points past last stored byte so far.
3005 * It returns n+1. */
3006static int o_save_ptr_helper(o_string *o, int n)
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00003007{
3008 char **list = (char**)o->data;
Denis Vlasenko895bea22008-06-10 18:06:24 +00003009 int string_start;
3010 int string_len;
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00003011
3012 if (!o->has_empty_slot) {
Denis Vlasenko895bea22008-06-10 18:06:24 +00003013 string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]);
3014 string_len = o->length - string_start;
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00003015 if (!(n & 0xf)) { /* 0, 0x10, 0x20...? */
Denis Vlasenko30c9cc52008-06-17 07:24:29 +00003016 debug_printf_list("list[%d]=%d string_start=%d (growing)\n", n, string_len, string_start);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00003017 /* list[n] points to string_start, make space for 16 more pointers */
3018 o->maxlen += 0x10 * sizeof(list[0]);
3019 o->data = xrealloc(o->data, o->maxlen + 1);
Denis Vlasenko7049ff82008-06-25 09:53:17 +00003020 list = (char**)o->data;
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00003021 memmove(list + n + 0x10, list + n, string_len);
3022 o->length += 0x10 * sizeof(list[0]);
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00003023 } else {
3024 debug_printf_list("list[%d]=%d string_start=%d\n",
3025 n, string_len, string_start);
3026 }
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00003027 } else {
3028 /* We have empty slot at list[n], reuse without growth */
Denis Vlasenko895bea22008-06-10 18:06:24 +00003029 string_start = ((n+1 + 0xf) & ~0xf) * sizeof(list[0]); /* NB: n+1! */
3030 string_len = o->length - string_start;
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00003031 debug_printf_list("list[%d]=%d string_start=%d (empty slot)\n",
3032 n, string_len, string_start);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00003033 o->has_empty_slot = 0;
3034 }
Denys Vlasenko4fb53fb2011-08-01 14:06:20 +02003035 o->has_quoted_part = 0;
Denys Vlasenkoda463fb2010-09-07 09:53:50 +02003036 list[n] = (char*)(uintptr_t)string_len;
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00003037 return n + 1;
3038}
3039
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00003040/* "What was our last o_save_ptr'ed position (byte offset relative o->data)?" */
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00003041static int o_get_last_ptr(o_string *o, int n)
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00003042{
3043 char **list = (char**)o->data;
3044 int string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]);
3045
Denys Vlasenkoda463fb2010-09-07 09:53:50 +02003046 return ((int)(uintptr_t)list[n-1]) + string_start;
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00003047}
3048
Denys Vlasenko9e800222010-10-03 14:28:04 +02003049#if ENABLE_HUSH_BRACE_EXPANSION
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003050/* There in a GNU extension, GLOB_BRACE, but it is not usable:
3051 * first, it processes even {a} (no commas), second,
3052 * I didn't manage to make it return strings when they don't match
Denys Vlasenko160746b2009-11-16 05:51:18 +01003053 * existing files. Need to re-implement it.
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003054 */
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003055
3056/* Helper */
3057static int glob_needed(const char *s)
3058{
3059 while (*s) {
3060 if (*s == '\\') {
3061 if (!s[1])
3062 return 0;
3063 s += 2;
3064 continue;
3065 }
3066 if (*s == '*' || *s == '[' || *s == '?' || *s == '{')
3067 return 1;
3068 s++;
3069 }
3070 return 0;
3071}
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003072/* Return pointer to next closing brace or to comma */
3073static const char *next_brace_sub(const char *cp)
3074{
3075 unsigned depth = 0;
3076 cp++;
3077 while (*cp != '\0') {
3078 if (*cp == '\\') {
3079 if (*++cp == '\0')
3080 break;
3081 cp++;
3082 continue;
Denys Vlasenko3581c622010-01-25 13:39:24 +01003083 }
Denys Vlasenkoda463fb2010-09-07 09:53:50 +02003084 if ((*cp == '}' && depth-- == 0) || (*cp == ',' && depth == 0))
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003085 break;
Denys Vlasenkoda463fb2010-09-07 09:53:50 +02003086 if (*cp++ == '{')
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003087 depth++;
3088 }
3089
3090 return *cp != '\0' ? cp : NULL;
3091}
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003092/* Recursive brace globber. Note: may garble pattern[]. */
3093static int glob_brace(char *pattern, o_string *o, int n)
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003094{
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003095 char *new_pattern_buf;
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003096 const char *begin;
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003097 const char *next;
3098 const char *rest;
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003099 const char *p;
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003100 size_t rest_len;
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003101
3102 debug_printf_glob("glob_brace('%s')\n", pattern);
3103
3104 begin = pattern;
3105 while (1) {
3106 if (*begin == '\0')
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003107 goto simple_glob;
Denys Vlasenkoda463fb2010-09-07 09:53:50 +02003108 if (*begin == '{') {
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003109 /* Find the first sub-pattern and at the same time
3110 * find the rest after the closing brace */
3111 next = next_brace_sub(begin);
3112 if (next == NULL) {
3113 /* An illegal expression */
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003114 goto simple_glob;
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003115 }
Denys Vlasenkoda463fb2010-09-07 09:53:50 +02003116 if (*next == '}') {
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003117 /* "{abc}" with no commas - illegal
3118 * brace expr, disregard and skip it */
3119 begin = next + 1;
3120 continue;
3121 }
3122 break;
3123 }
3124 if (*begin == '\\' && begin[1] != '\0')
3125 begin++;
3126 begin++;
3127 }
3128 debug_printf_glob("begin:%s\n", begin);
3129 debug_printf_glob("next:%s\n", next);
3130
3131 /* Now find the end of the whole brace expression */
3132 rest = next;
Denys Vlasenkoda463fb2010-09-07 09:53:50 +02003133 while (*rest != '}') {
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003134 rest = next_brace_sub(rest);
3135 if (rest == NULL) {
3136 /* An illegal expression */
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003137 goto simple_glob;
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003138 }
3139 debug_printf_glob("rest:%s\n", rest);
3140 }
3141 rest_len = strlen(++rest) + 1;
3142
3143 /* We are sure the brace expression is well-formed */
3144
3145 /* Allocate working buffer large enough for our work */
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003146 new_pattern_buf = xmalloc(strlen(pattern));
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003147
3148 /* We have a brace expression. BEGIN points to the opening {,
3149 * NEXT points past the terminator of the first element, and REST
3150 * points past the final }. We will accumulate result names from
3151 * recursive runs for each brace alternative in the buffer using
3152 * GLOB_APPEND. */
3153
3154 p = begin + 1;
3155 while (1) {
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003156 /* Construct the new glob expression */
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003157 memcpy(
3158 mempcpy(
3159 mempcpy(new_pattern_buf,
3160 /* We know the prefix for all sub-patterns */
3161 pattern, begin - pattern),
3162 p, next - p),
3163 rest, rest_len);
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003164
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003165 /* Note: glob_brace() may garble new_pattern_buf[].
3166 * That's why we re-copy prefix every time (1st memcpy above).
3167 */
3168 n = glob_brace(new_pattern_buf, o, n);
Denys Vlasenkoda463fb2010-09-07 09:53:50 +02003169 if (*next == '}') {
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003170 /* We saw the last entry */
3171 break;
3172 }
3173 p = next + 1;
3174 next = next_brace_sub(next);
3175 }
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003176 free(new_pattern_buf);
3177 return n;
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003178
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003179 simple_glob:
3180 {
3181 int gr;
3182 glob_t globdata;
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003183
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003184 memset(&globdata, 0, sizeof(globdata));
3185 gr = glob(pattern, 0, NULL, &globdata);
3186 debug_printf_glob("glob('%s'):%d\n", pattern, gr);
3187 if (gr != 0) {
3188 if (gr == GLOB_NOMATCH) {
3189 globfree(&globdata);
3190 /* NB: garbles parameter */
3191 unbackslash(pattern);
3192 o_addstr_with_NUL(o, pattern);
3193 debug_printf_glob("glob pattern '%s' is literal\n", pattern);
3194 return o_save_ptr_helper(o, n);
3195 }
3196 if (gr == GLOB_NOSPACE)
Denys Vlasenko899ae532018-04-01 19:59:37 +02003197 bb_die_memory_exhausted();
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003198 /* GLOB_ABORTED? Only happens with GLOB_ERR flag,
3199 * but we didn't specify it. Paranoia again. */
3200 bb_error_msg_and_die("glob error %d on '%s'", gr, pattern);
3201 }
3202 if (globdata.gl_pathv && globdata.gl_pathv[0]) {
3203 char **argv = globdata.gl_pathv;
3204 while (1) {
3205 o_addstr_with_NUL(o, *argv);
3206 n = o_save_ptr_helper(o, n);
3207 argv++;
3208 if (!*argv)
3209 break;
3210 }
3211 }
3212 globfree(&globdata);
3213 }
3214 return n;
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003215}
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003216/* Performs globbing on last list[],
3217 * saving each result as a new list[].
3218 */
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02003219static int perform_glob(o_string *o, int n)
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003220{
3221 char *pattern, *copy;
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003222
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02003223 debug_printf_glob("start perform_glob: n:%d o->data:%p\n", n, o->data);
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003224 if (!o->data)
3225 return o_save_ptr_helper(o, n);
3226 pattern = o->data + o_get_last_ptr(o, n);
3227 debug_printf_glob("glob pattern '%s'\n", pattern);
3228 if (!glob_needed(pattern)) {
3229 /* unbackslash last string in o in place, fix length */
3230 o->length = unbackslash(pattern) - o->data;
3231 debug_printf_glob("glob pattern '%s' is literal\n", pattern);
3232 return o_save_ptr_helper(o, n);
3233 }
3234
3235 copy = xstrdup(pattern);
3236 /* "forget" pattern in o */
3237 o->length = pattern - o->data;
3238 n = glob_brace(copy, o, n);
3239 free(copy);
3240 if (DEBUG_GLOB)
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02003241 debug_print_list("perform_glob returning", o, n);
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003242 return n;
3243}
3244
Denys Vlasenko238081f2010-10-03 14:26:26 +02003245#else /* !HUSH_BRACE_EXPANSION */
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003246
3247/* Helper */
3248static int glob_needed(const char *s)
3249{
3250 while (*s) {
3251 if (*s == '\\') {
3252 if (!s[1])
3253 return 0;
3254 s += 2;
3255 continue;
3256 }
3257 if (*s == '*' || *s == '[' || *s == '?')
3258 return 1;
3259 s++;
3260 }
3261 return 0;
3262}
3263/* Performs globbing on last list[],
3264 * saving each result as a new list[].
3265 */
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02003266static int perform_glob(o_string *o, int n)
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00003267{
3268 glob_t globdata;
3269 int gr;
3270 char *pattern;
3271
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02003272 debug_printf_glob("start perform_glob: n:%d o->data:%p\n", n, o->data);
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00003273 if (!o->data)
3274 return o_save_ptr_helper(o, n);
3275 pattern = o->data + o_get_last_ptr(o, n);
Denis Vlasenko30c9cc52008-06-17 07:24:29 +00003276 debug_printf_glob("glob pattern '%s'\n", pattern);
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00003277 if (!glob_needed(pattern)) {
3278 literal:
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003279 /* unbackslash last string in o in place, fix length */
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00003280 o->length = unbackslash(pattern) - o->data;
Denis Vlasenko30c9cc52008-06-17 07:24:29 +00003281 debug_printf_glob("glob pattern '%s' is literal\n", pattern);
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00003282 return o_save_ptr_helper(o, n);
3283 }
3284
3285 memset(&globdata, 0, sizeof(globdata));
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003286 /* Can't use GLOB_NOCHECK: it does not unescape the string.
3287 * If we glob "*.\*" and don't find anything, we need
3288 * to fall back to using literal "*.*", but GLOB_NOCHECK
3289 * will return "*.\*"!
3290 */
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00003291 gr = glob(pattern, 0, NULL, &globdata);
3292 debug_printf_glob("glob('%s'):%d\n", pattern, gr);
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003293 if (gr != 0) {
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003294 if (gr == GLOB_NOMATCH) {
3295 globfree(&globdata);
3296 goto literal;
3297 }
3298 if (gr == GLOB_NOSPACE)
Denys Vlasenko899ae532018-04-01 19:59:37 +02003299 bb_die_memory_exhausted();
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003300 /* GLOB_ABORTED? Only happens with GLOB_ERR flag,
3301 * but we didn't specify it. Paranoia again. */
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003302 bb_error_msg_and_die("glob error %d on '%s'", gr, pattern);
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00003303 }
3304 if (globdata.gl_pathv && globdata.gl_pathv[0]) {
3305 char **argv = globdata.gl_pathv;
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003306 /* "forget" pattern in o */
3307 o->length = pattern - o->data;
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00003308 while (1) {
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00003309 o_addstr_with_NUL(o, *argv);
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00003310 n = o_save_ptr_helper(o, n);
3311 argv++;
3312 if (!*argv)
3313 break;
3314 }
3315 }
3316 globfree(&globdata);
3317 if (DEBUG_GLOB)
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02003318 debug_print_list("perform_glob returning", o, n);
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00003319 return n;
3320}
3321
Denys Vlasenko238081f2010-10-03 14:26:26 +02003322#endif /* !HUSH_BRACE_EXPANSION */
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003323
Denys Vlasenko5b686cb2010-09-08 13:44:34 +02003324/* If o->o_expflags & EXP_FLAG_GLOB, glob the string so far remembered.
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00003325 * Otherwise, just finish current list[] and start new */
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00003326static int o_save_ptr(o_string *o, int n)
3327{
Denys Vlasenko5b686cb2010-09-08 13:44:34 +02003328 if (o->o_expflags & EXP_FLAG_GLOB) {
Denis Vlasenkoa8b6dff2009-03-20 12:05:14 +00003329 /* If o->has_empty_slot, list[n] was already globbed
3330 * (if it was requested back then when it was filled)
3331 * so don't do that again! */
3332 if (!o->has_empty_slot)
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02003333 return perform_glob(o, n); /* o_save_ptr_helper is inside */
Denis Vlasenkoa8b6dff2009-03-20 12:05:14 +00003334 }
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00003335 return o_save_ptr_helper(o, n);
3336}
3337
3338/* "Please convert list[n] to real char* ptrs, and NULL terminate it." */
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00003339static char **o_finalize_list(o_string *o, int n)
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00003340{
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00003341 char **list;
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00003342 int string_start;
3343
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00003344 n = o_save_ptr(o, n); /* force growth for list[n] if necessary */
3345 if (DEBUG_EXPAND)
3346 debug_print_list("finalized", o, n);
Denis Vlasenko30c9cc52008-06-17 07:24:29 +00003347 debug_printf_expand("finalized n:%d\n", n);
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00003348 list = (char**)o->data;
3349 string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]);
3350 list[--n] = NULL;
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00003351 while (n) {
3352 n--;
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003353 list[n] = o->data + (int)(uintptr_t)list[n] + string_start;
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00003354 }
3355 return list;
3356}
3357
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003358static void free_pipe_list(struct pipe *pi);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003359
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003360/* Returns pi->next - next pipe in the list */
3361static struct pipe *free_pipe(struct pipe *pi)
Denis Vlasenkof886fd22008-10-13 12:36:05 +00003362{
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003363 struct pipe *next;
3364 int i;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003365
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003366 debug_printf_clean("free_pipe (pid %d)\n", getpid());
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003367 for (i = 0; i < pi->num_cmds; i++) {
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003368 struct command *command;
3369 struct redir_struct *r, *rnext;
3370
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003371 command = &pi->cmds[i];
Denis Vlasenko0701dca2009-04-11 10:38:47 +00003372 debug_printf_clean(" command %d:\n", i);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003373 if (command->argv) {
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003374 if (DEBUG_CLEAN) {
3375 int a;
3376 char **p;
3377 for (a = 0, p = command->argv; *p; a++, p++) {
3378 debug_printf_clean(" argv[%d] = %s\n", a, *p);
3379 }
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003380 }
3381 free_strings(command->argv);
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003382 //command->argv = NULL;
Denis Vlasenkob6e65562009-04-03 16:49:04 +00003383 }
3384 /* not "else if": on syntax error, we may have both! */
3385 if (command->group) {
Denys Vlasenko9d617c42009-06-09 18:40:52 +02003386 debug_printf_clean(" begin group (cmd_type:%d)\n",
3387 command->cmd_type);
Denis Vlasenko0701dca2009-04-11 10:38:47 +00003388 free_pipe_list(command->group);
3389 debug_printf_clean(" end group\n");
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003390 //command->group = NULL;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003391 }
Denis Vlasenkoed055212009-04-11 10:37:10 +00003392 /* else is crucial here.
3393 * If group != NULL, child_func is meaningless */
3394#if ENABLE_HUSH_FUNCTIONS
3395 else if (command->child_func) {
3396 debug_printf_exec("cmd %p releases child func at %p\n", command, command->child_func);
3397 command->child_func->parent_cmd = NULL;
3398 }
3399#endif
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00003400#if !BB_MMU
3401 free(command->group_as_string);
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003402 //command->group_as_string = NULL;
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00003403#endif
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003404 for (r = command->redirects; r; r = rnext) {
Denis Vlasenko0701dca2009-04-11 10:38:47 +00003405 debug_printf_clean(" redirect %d%s",
3406 r->rd_fd, redir_table[r->rd_type].descrip);
Denis Vlasenko02d6f1a2009-04-07 19:56:55 +00003407 /* guard against the case >$FOO, where foo is unset or blank */
3408 if (r->rd_filename) {
3409 debug_printf_clean(" fname:'%s'\n", r->rd_filename);
3410 free(r->rd_filename);
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003411 //r->rd_filename = NULL;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003412 }
Denis Vlasenko02d6f1a2009-04-07 19:56:55 +00003413 debug_printf_clean(" rd_dup:%d\n", r->rd_dup);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003414 rnext = r->next;
3415 free(r);
3416 }
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003417 //command->redirects = NULL;
Denis Vlasenkof886fd22008-10-13 12:36:05 +00003418 }
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003419 free(pi->cmds); /* children are an array, they get freed all at once */
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003420 //pi->cmds = NULL;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003421#if ENABLE_HUSH_JOB
3422 free(pi->cmdtext);
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003423 //pi->cmdtext = NULL;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003424#endif
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003425
3426 next = pi->next;
3427 free(pi);
3428 return next;
Denis Vlasenkof886fd22008-10-13 12:36:05 +00003429}
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00003430
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003431static void free_pipe_list(struct pipe *pi)
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003432{
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003433 while (pi) {
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003434#if HAS_KEYWORDS
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003435 debug_printf_clean("pipe reserved word %d\n", pi->res_word);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003436#endif
Denis Vlasenko0701dca2009-04-11 10:38:47 +00003437 debug_printf_clean("pipe followup code %d\n", pi->followup);
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003438 pi = free_pipe(pi);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003439 }
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003440}
3441
3442
Denys Vlasenkob36abf22010-09-05 14:50:59 +02003443/*** Parsing routines ***/
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00003444
Denys Vlasenko7b4c0fd2010-11-22 17:58:14 +01003445#ifndef debug_print_tree
3446static void debug_print_tree(struct pipe *pi, int lvl)
3447{
3448 static const char *const PIPE[] = {
3449 [PIPE_SEQ] = "SEQ",
3450 [PIPE_AND] = "AND",
3451 [PIPE_OR ] = "OR" ,
3452 [PIPE_BG ] = "BG" ,
3453 };
3454 static const char *RES[] = {
3455 [RES_NONE ] = "NONE" ,
3456# if ENABLE_HUSH_IF
3457 [RES_IF ] = "IF" ,
3458 [RES_THEN ] = "THEN" ,
3459 [RES_ELIF ] = "ELIF" ,
3460 [RES_ELSE ] = "ELSE" ,
3461 [RES_FI ] = "FI" ,
3462# endif
3463# if ENABLE_HUSH_LOOPS
3464 [RES_FOR ] = "FOR" ,
3465 [RES_WHILE] = "WHILE",
3466 [RES_UNTIL] = "UNTIL",
3467 [RES_DO ] = "DO" ,
3468 [RES_DONE ] = "DONE" ,
3469# endif
3470# if ENABLE_HUSH_LOOPS || ENABLE_HUSH_CASE
3471 [RES_IN ] = "IN" ,
3472# endif
3473# if ENABLE_HUSH_CASE
3474 [RES_CASE ] = "CASE" ,
3475 [RES_CASE_IN ] = "CASE_IN" ,
3476 [RES_MATCH] = "MATCH",
3477 [RES_CASE_BODY] = "CASE_BODY",
3478 [RES_ESAC ] = "ESAC" ,
3479# endif
3480 [RES_XXXX ] = "XXXX" ,
3481 [RES_SNTX ] = "SNTX" ,
3482 };
3483 static const char *const CMDTYPE[] = {
3484 "{}",
3485 "()",
3486 "[noglob]",
3487# if ENABLE_HUSH_FUNCTIONS
3488 "func()",
3489# endif
3490 };
3491
3492 int pin, prn;
3493
3494 pin = 0;
3495 while (pi) {
Denys Vlasenko5807e182018-02-08 19:19:04 +01003496 fdprintf(2, "%*spipe %d %sres_word=%s followup=%d %s\n",
3497 lvl*2, "",
3498 pin,
3499 (IF_HAS_KEYWORDS(pi->pi_inverted ? "! " :) ""),
3500 RES[pi->res_word],
3501 pi->followup, PIPE[pi->followup]
3502 );
Denys Vlasenko7b4c0fd2010-11-22 17:58:14 +01003503 prn = 0;
3504 while (prn < pi->num_cmds) {
3505 struct command *command = &pi->cmds[prn];
3506 char **argv = command->argv;
3507
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01003508 fdprintf(2, "%*s cmd %d assignment_cnt:%d",
Denys Vlasenko7b4c0fd2010-11-22 17:58:14 +01003509 lvl*2, "", prn,
3510 command->assignment_cnt);
Denys Vlasenko5807e182018-02-08 19:19:04 +01003511#if ENABLE_HUSH_LINENO_VAR
3512 fdprintf(2, " LINENO:%u", command->lineno);
3513#endif
Denys Vlasenko7b4c0fd2010-11-22 17:58:14 +01003514 if (command->group) {
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01003515 fdprintf(2, " group %s: (argv=%p)%s%s\n",
Denys Vlasenko7b4c0fd2010-11-22 17:58:14 +01003516 CMDTYPE[command->cmd_type],
3517 argv
3518# if !BB_MMU
3519 , " group_as_string:", command->group_as_string
3520# else
3521 , "", ""
3522# endif
3523 );
3524 debug_print_tree(command->group, lvl+1);
3525 prn++;
3526 continue;
3527 }
3528 if (argv) while (*argv) {
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01003529 fdprintf(2, " '%s'", *argv);
Denys Vlasenko7b4c0fd2010-11-22 17:58:14 +01003530 argv++;
3531 }
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01003532 fdprintf(2, "\n");
Denys Vlasenko7b4c0fd2010-11-22 17:58:14 +01003533 prn++;
3534 }
3535 pi = pi->next;
3536 pin++;
3537 }
3538}
3539#endif /* debug_print_tree */
3540
Denis Vlasenkoac678ec2007-04-16 22:32:04 +00003541static struct pipe *new_pipe(void)
3542{
Eric Andersen25f27032001-04-26 23:22:31 +00003543 struct pipe *pi;
Denis Vlasenko3ac0e002007-04-28 16:45:22 +00003544 pi = xzalloc(sizeof(struct pipe));
Denis Vlasenko5ec61322008-06-24 00:50:07 +00003545 /*pi->res_word = RES_NONE; - RES_NONE is 0 anyway */
Eric Andersen25f27032001-04-26 23:22:31 +00003546 return pi;
3547}
3548
Denis Vlasenkof8c1f022009-04-17 11:55:42 +00003549/* Command (member of a pipe) is complete, or we start a new pipe
3550 * if ctx->command is NULL.
3551 * No errors possible here.
3552 */
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003553static int done_command(struct parse_context *ctx)
3554{
3555 /* The command is really already in the pipe structure, so
3556 * advance the pipe counter and make a new, null command. */
3557 struct pipe *pi = ctx->pipe;
3558 struct command *command = ctx->command;
3559
Denys Vlasenkod6a37d82016-09-20 16:22:24 +02003560#if 0 /* Instead we emit error message at run time */
3561 if (ctx->pending_redirect) {
3562 /* For example, "cmd >" (no filename to redirect to) */
Denys Vlasenko39701202017-08-02 19:44:05 +02003563 syntax_error("invalid redirect");
Denys Vlasenkod6a37d82016-09-20 16:22:24 +02003564 ctx->pending_redirect = NULL;
3565 }
3566#endif
3567
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003568 if (command) {
Denis Vlasenkof8c1f022009-04-17 11:55:42 +00003569 if (IS_NULL_CMD(command)) {
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003570 debug_printf_parse("done_command: skipping null cmd, num_cmds=%d\n", pi->num_cmds);
Denis Vlasenkof8c1f022009-04-17 11:55:42 +00003571 goto clear_and_ret;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003572 }
3573 pi->num_cmds++;
3574 debug_printf_parse("done_command: ++num_cmds=%d\n", pi->num_cmds);
Denis Vlasenkocd418a22009-04-06 18:08:35 +00003575 //debug_print_tree(ctx->list_head, 20);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003576 } else {
3577 debug_printf_parse("done_command: initializing, num_cmds=%d\n", pi->num_cmds);
3578 }
3579
3580 /* Only real trickiness here is that the uncommitted
3581 * command structure is not counted in pi->num_cmds. */
3582 pi->cmds = xrealloc(pi->cmds, sizeof(*pi->cmds) * (pi->num_cmds+1));
Denis Vlasenkof8c1f022009-04-17 11:55:42 +00003583 ctx->command = command = &pi->cmds[pi->num_cmds];
3584 clear_and_ret:
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003585 memset(command, 0, sizeof(*command));
Denys Vlasenko5807e182018-02-08 19:19:04 +01003586#if ENABLE_HUSH_LINENO_VAR
Denys Vlasenko6aad1dd2018-01-19 15:37:04 +01003587 command->lineno = G.lineno;
Denys Vlasenko5807e182018-02-08 19:19:04 +01003588 debug_printf_parse("command->lineno = G.lineno (%u)\n", G.lineno);
Denys Vlasenko6aad1dd2018-01-19 15:37:04 +01003589#endif
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003590 return pi->num_cmds; /* used only for 0/nonzero check */
3591}
3592
3593static void done_pipe(struct parse_context *ctx, pipe_style type)
3594{
3595 int not_null;
3596
3597 debug_printf_parse("done_pipe entered, followup %d\n", type);
3598 /* Close previous command */
3599 not_null = done_command(ctx);
Denis Vlasenkocd418a22009-04-06 18:08:35 +00003600#if HAS_KEYWORDS
3601 ctx->pipe->pi_inverted = ctx->ctx_inverted;
3602 ctx->ctx_inverted = 0;
3603 ctx->pipe->res_word = ctx->ctx_res_w;
3604#endif
Denys Vlasenkob24e55d2017-07-16 20:29:35 +02003605 if (type == PIPE_BG && ctx->list_head != ctx->pipe) {
3606 /* Necessary since && and || have precedence over &:
Denys Vlasenkoee553b92017-07-15 22:51:55 +02003607 * "cmd1 && cmd2 &" must spawn both cmds, not only cmd2,
3608 * in a backgrounded subshell.
3609 */
3610 struct pipe *pi;
3611 struct command *command;
3612
Denys Vlasenkob24e55d2017-07-16 20:29:35 +02003613 /* Is this actually this construct, all pipes end with && or ||? */
Denys Vlasenkoee553b92017-07-15 22:51:55 +02003614 pi = ctx->list_head;
3615 while (pi != ctx->pipe) {
3616 if (pi->followup != PIPE_AND && pi->followup != PIPE_OR)
3617 goto no_conv;
3618 pi = pi->next;
3619 }
3620
3621 debug_printf_parse("BG with more than one pipe, converting to { p1 &&...pN; } &\n");
3622 pi->followup = PIPE_SEQ; /* close pN _not_ with "&"! */
3623 pi = xzalloc(sizeof(*pi));
3624 pi->followup = PIPE_BG;
3625 pi->num_cmds = 1;
3626 pi->cmds = xzalloc(sizeof(pi->cmds[0]));
3627 command = &pi->cmds[0];
3628 if (CMD_NORMAL != 0) /* "if xzalloc didn't do that already" */
3629 command->cmd_type = CMD_NORMAL;
3630 command->group = ctx->list_head;
3631#if !BB_MMU
Denys Vlasenkob24e55d2017-07-16 20:29:35 +02003632 command->group_as_string = xstrndup(
3633 ctx->as_string.data,
3634 ctx->as_string.length - 1 /* do not copy last char, "&" */
3635 );
Denys Vlasenkoee553b92017-07-15 22:51:55 +02003636#endif
3637 /* Replace all pipes in ctx with one newly created */
3638 ctx->list_head = ctx->pipe = pi;
Denys Vlasenkob24e55d2017-07-16 20:29:35 +02003639 } else {
3640 no_conv:
3641 ctx->pipe->followup = type;
Denys Vlasenkoee553b92017-07-15 22:51:55 +02003642 }
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003643
3644 /* Without this check, even just <enter> on command line generates
3645 * tree of three NOPs (!). Which is harmless but annoying.
Denis Vlasenkof8c1f022009-04-17 11:55:42 +00003646 * IOW: it is safe to do it unconditionally. */
Denis Vlasenkocd418a22009-04-06 18:08:35 +00003647 if (not_null
Denis Vlasenko7f959372009-04-14 08:06:59 +00003648#if ENABLE_HUSH_IF
Denis Vlasenkocd418a22009-04-06 18:08:35 +00003649 || ctx->ctx_res_w == RES_FI
Denis Vlasenko7f959372009-04-14 08:06:59 +00003650#endif
3651#if ENABLE_HUSH_LOOPS
Denis Vlasenkocd418a22009-04-06 18:08:35 +00003652 || ctx->ctx_res_w == RES_DONE
3653 || ctx->ctx_res_w == RES_FOR
3654 || ctx->ctx_res_w == RES_IN
Denis Vlasenko7f959372009-04-14 08:06:59 +00003655#endif
3656#if ENABLE_HUSH_CASE
Denis Vlasenkocd418a22009-04-06 18:08:35 +00003657 || ctx->ctx_res_w == RES_ESAC
3658#endif
3659 ) {
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003660 struct pipe *new_p;
3661 debug_printf_parse("done_pipe: adding new pipe: "
3662 "not_null:%d ctx->ctx_res_w:%d\n",
3663 not_null, ctx->ctx_res_w);
3664 new_p = new_pipe();
3665 ctx->pipe->next = new_p;
3666 ctx->pipe = new_p;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003667 /* RES_THEN, RES_DO etc are "sticky" -
Denis Vlasenkof8c1f022009-04-17 11:55:42 +00003668 * they remain set for pipes inside if/while.
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003669 * This is used to control execution.
3670 * RES_FOR and RES_IN are NOT sticky (needed to support
3671 * cases where variable or value happens to match a keyword):
3672 */
3673#if ENABLE_HUSH_LOOPS
3674 if (ctx->ctx_res_w == RES_FOR
3675 || ctx->ctx_res_w == RES_IN)
3676 ctx->ctx_res_w = RES_NONE;
3677#endif
3678#if ENABLE_HUSH_CASE
3679 if (ctx->ctx_res_w == RES_MATCH)
Denys Vlasenkoe9bda902009-05-23 16:50:07 +02003680 ctx->ctx_res_w = RES_CASE_BODY;
3681 if (ctx->ctx_res_w == RES_CASE)
3682 ctx->ctx_res_w = RES_CASE_IN;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003683#endif
Denis Vlasenkob6e65562009-04-03 16:49:04 +00003684 ctx->command = NULL; /* trick done_command below */
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003685 /* Create the memory for command, roughly:
3686 * ctx->pipe->cmds = new struct command;
3687 * ctx->command = &ctx->pipe->cmds[0];
3688 */
3689 done_command(ctx);
Denis Vlasenkocd418a22009-04-06 18:08:35 +00003690 //debug_print_tree(ctx->list_head, 10);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003691 }
3692 debug_printf_parse("done_pipe return\n");
3693}
3694
Denis Vlasenko9af22c72008-10-09 12:54:58 +00003695static void initialize_context(struct parse_context *ctx)
Eric Andersen25f27032001-04-26 23:22:31 +00003696{
Denis Vlasenkoa8442002008-06-14 11:00:17 +00003697 memset(ctx, 0, sizeof(*ctx));
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02003698 if (MAYBE_ASSIGNMENT != 0)
3699 ctx->is_assignment = MAYBE_ASSIGNMENT;
Denis Vlasenko1a735862007-05-23 00:32:25 +00003700 ctx->pipe = ctx->list_head = new_pipe();
Denis Vlasenko9af22c72008-10-09 12:54:58 +00003701 /* Create the memory for command, roughly:
3702 * ctx->pipe->cmds = new struct command;
3703 * ctx->command = &ctx->pipe->cmds[0];
Denis Vlasenkoa8442002008-06-14 11:00:17 +00003704 */
3705 done_command(ctx);
Eric Andersen25f27032001-04-26 23:22:31 +00003706}
3707
Denis Vlasenkoa8442002008-06-14 11:00:17 +00003708/* If a reserved word is found and processed, parse context is modified
3709 * and 1 is returned.
Eric Andersen25f27032001-04-26 23:22:31 +00003710 */
Denis Vlasenko5ec61322008-06-24 00:50:07 +00003711#if HAS_KEYWORDS
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003712struct reserved_combo {
3713 char literal[6];
3714 unsigned char res;
3715 unsigned char assignment_flag;
3716 int flag;
3717};
3718enum {
3719 FLAG_END = (1 << RES_NONE ),
Denys Vlasenkoc0836532009-10-19 13:13:06 +02003720# if ENABLE_HUSH_IF
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003721 FLAG_IF = (1 << RES_IF ),
3722 FLAG_THEN = (1 << RES_THEN ),
3723 FLAG_ELIF = (1 << RES_ELIF ),
3724 FLAG_ELSE = (1 << RES_ELSE ),
3725 FLAG_FI = (1 << RES_FI ),
Denys Vlasenkoc0836532009-10-19 13:13:06 +02003726# endif
3727# if ENABLE_HUSH_LOOPS
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003728 FLAG_FOR = (1 << RES_FOR ),
3729 FLAG_WHILE = (1 << RES_WHILE),
3730 FLAG_UNTIL = (1 << RES_UNTIL),
3731 FLAG_DO = (1 << RES_DO ),
3732 FLAG_DONE = (1 << RES_DONE ),
3733 FLAG_IN = (1 << RES_IN ),
Denys Vlasenkoc0836532009-10-19 13:13:06 +02003734# endif
3735# if ENABLE_HUSH_CASE
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003736 FLAG_MATCH = (1 << RES_MATCH),
3737 FLAG_ESAC = (1 << RES_ESAC ),
Denys Vlasenkoc0836532009-10-19 13:13:06 +02003738# endif
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003739 FLAG_START = (1 << RES_XXXX ),
3740};
3741
3742static const struct reserved_combo* match_reserved_word(o_string *word)
3743{
Eric Andersen25f27032001-04-26 23:22:31 +00003744 /* Mostly a list of accepted follow-up reserved words.
3745 * FLAG_END means we are done with the sequence, and are ready
3746 * to turn the compound list into a command.
3747 * FLAG_START means the word must start a new compound list.
3748 */
Denis Vlasenkoc72c1ed2007-01-30 22:31:26 +00003749 static const struct reserved_combo reserved_list[] = {
Denys Vlasenkoc0836532009-10-19 13:13:06 +02003750# if ENABLE_HUSH_IF
Denys Vlasenko29f9b722011-05-14 11:27:36 +02003751 { "!", RES_NONE, NOT_ASSIGNMENT , 0 },
3752 { "if", RES_IF, MAYBE_ASSIGNMENT, FLAG_THEN | FLAG_START },
3753 { "then", RES_THEN, MAYBE_ASSIGNMENT, FLAG_ELIF | FLAG_ELSE | FLAG_FI },
3754 { "elif", RES_ELIF, MAYBE_ASSIGNMENT, FLAG_THEN },
3755 { "else", RES_ELSE, MAYBE_ASSIGNMENT, FLAG_FI },
3756 { "fi", RES_FI, NOT_ASSIGNMENT , FLAG_END },
Denys Vlasenkoc0836532009-10-19 13:13:06 +02003757# endif
3758# if ENABLE_HUSH_LOOPS
Denys Vlasenko29f9b722011-05-14 11:27:36 +02003759 { "for", RES_FOR, NOT_ASSIGNMENT , FLAG_IN | FLAG_DO | FLAG_START },
3760 { "while", RES_WHILE, MAYBE_ASSIGNMENT, FLAG_DO | FLAG_START },
3761 { "until", RES_UNTIL, MAYBE_ASSIGNMENT, FLAG_DO | FLAG_START },
3762 { "in", RES_IN, NOT_ASSIGNMENT , FLAG_DO },
3763 { "do", RES_DO, MAYBE_ASSIGNMENT, FLAG_DONE },
3764 { "done", RES_DONE, NOT_ASSIGNMENT , FLAG_END },
Denys Vlasenkoc0836532009-10-19 13:13:06 +02003765# endif
3766# if ENABLE_HUSH_CASE
Denys Vlasenko29f9b722011-05-14 11:27:36 +02003767 { "case", RES_CASE, NOT_ASSIGNMENT , FLAG_MATCH | FLAG_START },
3768 { "esac", RES_ESAC, NOT_ASSIGNMENT , FLAG_END },
Denys Vlasenkoc0836532009-10-19 13:13:06 +02003769# endif
Eric Andersen25f27032001-04-26 23:22:31 +00003770 };
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003771 const struct reserved_combo *r;
3772
Denys Vlasenkoe4dcba12010-10-28 18:57:19 +02003773 for (r = reserved_list; r < reserved_list + ARRAY_SIZE(reserved_list); r++) {
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003774 if (strcmp(word->data, r->literal) == 0)
3775 return r;
3776 }
3777 return NULL;
3778}
Denys Vlasenko5807e182018-02-08 19:19:04 +01003779/* Return NULL: not a keyword, else: keyword
Denis Vlasenkobb929512009-04-16 10:59:40 +00003780 */
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02003781static const struct reserved_combo* reserved_word(struct parse_context *ctx)
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003782{
Denys Vlasenkoc0836532009-10-19 13:13:06 +02003783# if ENABLE_HUSH_CASE
Denis Vlasenko17f02e72008-07-14 04:32:29 +00003784 static const struct reserved_combo reserved_match = {
Denis Vlasenko2b576b82008-08-04 00:46:07 +00003785 "", RES_MATCH, NOT_ASSIGNMENT , FLAG_MATCH | FLAG_ESAC
Denis Vlasenko17f02e72008-07-14 04:32:29 +00003786 };
Denys Vlasenkoc0836532009-10-19 13:13:06 +02003787# endif
Denis Vlasenkoc72c1ed2007-01-30 22:31:26 +00003788 const struct reserved_combo *r;
Denis Vlasenkoc72c1ed2007-01-30 22:31:26 +00003789
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02003790 if (ctx->word.has_quoted_part)
Denis Vlasenkobb929512009-04-16 10:59:40 +00003791 return 0;
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02003792 r = match_reserved_word(&ctx->word);
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003793 if (!r)
Denys Vlasenko5807e182018-02-08 19:19:04 +01003794 return r; /* NULL */
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003795
3796 debug_printf("found reserved word %s, res %d\n", r->literal, r->res);
Denys Vlasenkoc0836532009-10-19 13:13:06 +02003797# if ENABLE_HUSH_CASE
Denys Vlasenkoe9bda902009-05-23 16:50:07 +02003798 if (r->res == RES_IN && ctx->ctx_res_w == RES_CASE_IN) {
3799 /* "case word IN ..." - IN part starts first MATCH part */
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003800 r = &reserved_match;
Denys Vlasenkoe9bda902009-05-23 16:50:07 +02003801 } else
Denys Vlasenkoc0836532009-10-19 13:13:06 +02003802# endif
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003803 if (r->flag == 0) { /* '!' */
3804 if (ctx->ctx_inverted) { /* bash doesn't accept '! ! true' */
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00003805 syntax_error("! ! command");
Denis Vlasenkobb929512009-04-16 10:59:40 +00003806 ctx->ctx_res_w = RES_SNTX;
Eric Andersen25f27032001-04-26 23:22:31 +00003807 }
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003808 ctx->ctx_inverted = 1;
Denys Vlasenko5807e182018-02-08 19:19:04 +01003809 return r;
Eric Andersen25f27032001-04-26 23:22:31 +00003810 }
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003811 if (r->flag & FLAG_START) {
Denis Vlasenkob6e65562009-04-03 16:49:04 +00003812 struct parse_context *old;
Denis Vlasenkobb929512009-04-16 10:59:40 +00003813
Denys Vlasenko9e55a152017-07-10 10:01:12 +02003814 old = xmemdup(ctx, sizeof(*ctx));
Denis Vlasenkob6e65562009-04-03 16:49:04 +00003815 debug_printf_parse("push stack %p\n", old);
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003816 initialize_context(ctx);
Denis Vlasenkob6e65562009-04-03 16:49:04 +00003817 ctx->stack = old;
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003818 } else if (/*ctx->ctx_res_w == RES_NONE ||*/ !(ctx->old_flag & (1 << r->res))) {
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02003819 syntax_error_at(ctx->word.data);
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003820 ctx->ctx_res_w = RES_SNTX;
Denys Vlasenko5807e182018-02-08 19:19:04 +01003821 return r;
Denis Vlasenkobb929512009-04-16 10:59:40 +00003822 } else {
3823 /* "{...} fi" is ok. "{...} if" is not
3824 * Example:
3825 * if { echo foo; } then { echo bar; } fi */
3826 if (ctx->command->group)
3827 done_pipe(ctx, PIPE_SEQ);
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003828 }
Denis Vlasenkobb929512009-04-16 10:59:40 +00003829
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003830 ctx->ctx_res_w = r->res;
3831 ctx->old_flag = r->flag;
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02003832 ctx->is_assignment = r->assignment_flag;
3833 debug_printf_parse("ctx->is_assignment='%s'\n", assignment_flag[ctx->is_assignment]);
Denis Vlasenkobb929512009-04-16 10:59:40 +00003834
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003835 if (ctx->old_flag & FLAG_END) {
3836 struct parse_context *old;
Denis Vlasenkobb929512009-04-16 10:59:40 +00003837
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003838 done_pipe(ctx, PIPE_SEQ);
Denis Vlasenkob6e65562009-04-03 16:49:04 +00003839 debug_printf_parse("pop stack %p\n", ctx->stack);
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003840 old = ctx->stack;
3841 old->command->group = ctx->list_head;
Denys Vlasenko9d617c42009-06-09 18:40:52 +02003842 old->command->cmd_type = CMD_NORMAL;
Denys Vlasenkoc0836532009-10-19 13:13:06 +02003843# if !BB_MMU
Denys Vlasenkob5be13c2015-09-04 06:22:10 +02003844 /* At this point, the compound command's string is in
3845 * ctx->as_string... except for the leading keyword!
3846 * Consider this example: "echo a | if true; then echo a; fi"
3847 * ctx->as_string will contain "true; then echo a; fi",
3848 * with "if " remaining in old->as_string!
3849 */
3850 {
3851 char *str;
3852 int len = old->as_string.length;
3853 /* Concatenate halves */
3854 o_addstr(&old->as_string, ctx->as_string.data);
3855 o_free_unsafe(&ctx->as_string);
3856 /* Find where leading keyword starts in first half */
3857 str = old->as_string.data + len;
3858 if (str > old->as_string.data)
3859 str--; /* skip whitespace after keyword */
3860 while (str > old->as_string.data && isalpha(str[-1]))
3861 str--;
3862 /* Ugh, we're done with this horrid hack */
3863 old->command->group_as_string = xstrdup(str);
3864 debug_printf_parse("pop, remembering as:'%s'\n",
3865 old->command->group_as_string);
3866 }
Denys Vlasenkoc0836532009-10-19 13:13:06 +02003867# endif
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003868 *ctx = *old; /* physical copy */
3869 free(old);
3870 }
Denys Vlasenko5807e182018-02-08 19:19:04 +01003871 return r;
Eric Andersen25f27032001-04-26 23:22:31 +00003872}
Denys Vlasenkoc0836532009-10-19 13:13:06 +02003873#endif /* HAS_KEYWORDS */
Eric Andersen25f27032001-04-26 23:22:31 +00003874
Denis Vlasenkoa8442002008-06-14 11:00:17 +00003875/* Word is complete, look at it and update parsing context.
Denis Vlasenkob6e65562009-04-03 16:49:04 +00003876 * Normal return is 0. Syntax errors return 1.
3877 * Note: on return, word is reset, but not o_free'd!
3878 */
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02003879static int done_word(struct parse_context *ctx)
Eric Andersen25f27032001-04-26 23:22:31 +00003880{
Denis Vlasenko9af22c72008-10-09 12:54:58 +00003881 struct command *command = ctx->command;
Eric Andersen25f27032001-04-26 23:22:31 +00003882
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02003883 debug_printf_parse("done_word entered: '%s' %p\n", ctx->word.data, command);
3884 if (ctx->word.length == 0 && !ctx->word.has_quoted_part) {
Denis Vlasenkoab876cd2008-06-18 16:29:32 +00003885 debug_printf_parse("done_word return 0: true null, ignored\n");
3886 return 0;
Eric Andersen25f27032001-04-26 23:22:31 +00003887 }
Denis Vlasenko2b576b82008-08-04 00:46:07 +00003888
Eric Andersen25f27032001-04-26 23:22:31 +00003889 if (ctx->pending_redirect) {
Denis Vlasenkoab876cd2008-06-18 16:29:32 +00003890 /* We do not glob in e.g. >*.tmp case. bash seems to glob here
3891 * only if run as "bash", not "sh" */
Denys Vlasenkoe84212f2018-04-01 20:11:23 +02003892 /* http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00003893 * "2.7 Redirection
Denys Vlasenkoe84212f2018-04-01 20:11:23 +02003894 * If the redirection operator is "<<" or "<<-", the word
3895 * that follows the redirection operator shall be
3896 * subjected to quote removal; it is unspecified whether
3897 * any of the other expansions occur. For the other
3898 * redirection operators, the word that follows the
3899 * redirection operator shall be subjected to tilde
3900 * expansion, parameter expansion, command substitution,
3901 * arithmetic expansion, and quote removal.
3902 * Pathname expansion shall not be performed
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00003903 * on the word by a non-interactive shell; an interactive
3904 * shell may perform it, but shall do so only when
3905 * the expansion would result in one word."
3906 */
Denys Vlasenkobb6f5732018-04-01 18:55:00 +02003907//bash does not do parameter/command substitution or arithmetic expansion
3908//for _heredoc_ redirection word: these constructs look for exact eof marker
3909// as written:
3910// <<EOF$t
3911// <<EOF$((1))
Denys Vlasenkoe84212f2018-04-01 20:11:23 +02003912// <<EOF`true` [this case also makes heredoc "quoted", a-la <<"EOF". Probably bash-4.3.43 bug]
3913
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02003914 ctx->pending_redirect->rd_filename = xstrdup(ctx->word.data);
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00003915 /* Cater for >\file case:
3916 * >\a creates file a; >\\a, >"\a", >"\\a" create file \a
3917 * Same with heredocs:
3918 * for <<\H delim is H; <<\\H, <<"\H", <<"\\H" - \H
3919 */
Denys Vlasenkoe640cb42009-05-28 16:49:11 +02003920 if (ctx->pending_redirect->rd_type == REDIRECT_HEREDOC) {
3921 unbackslash(ctx->pending_redirect->rd_filename);
3922 /* Is it <<"HEREDOC"? */
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02003923 if (ctx->word.has_quoted_part) {
Denys Vlasenkoe640cb42009-05-28 16:49:11 +02003924 ctx->pending_redirect->rd_dup |= HEREDOC_QUOTED;
3925 }
Denis Vlasenko02d6f1a2009-04-07 19:56:55 +00003926 }
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02003927 debug_printf_parse("word stored in rd_filename: '%s'\n", ctx->word.data);
Denis Vlasenko1fd1ea42009-04-10 12:03:20 +00003928 ctx->pending_redirect = NULL;
Eric Andersen25f27032001-04-26 23:22:31 +00003929 } else {
Denis Vlasenko5ec61322008-06-24 00:50:07 +00003930#if HAS_KEYWORDS
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00003931# if ENABLE_HUSH_CASE
Denis Vlasenko757361f2008-07-14 08:26:47 +00003932 if (ctx->ctx_dsemicolon
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02003933 && strcmp(ctx->word.data, "esac") != 0 /* not "... pattern) cmd;; esac" */
Denis Vlasenko757361f2008-07-14 08:26:47 +00003934 ) {
Denis Vlasenko395ae452008-07-14 06:29:38 +00003935 /* already done when ctx_dsemicolon was set to 1: */
Denis Vlasenko17f02e72008-07-14 04:32:29 +00003936 /* ctx->ctx_res_w = RES_MATCH; */
3937 ctx->ctx_dsemicolon = 0;
3938 } else
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00003939# endif
Denis Vlasenko9af22c72008-10-09 12:54:58 +00003940 if (!command->argv /* if it's the first word... */
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00003941# if ENABLE_HUSH_LOOPS
Denis Vlasenko733e3fb2008-07-06 10:01:13 +00003942 && ctx->ctx_res_w != RES_FOR /* ...not after FOR or IN */
3943 && ctx->ctx_res_w != RES_IN
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00003944# endif
Denys Vlasenkoe9bda902009-05-23 16:50:07 +02003945# if ENABLE_HUSH_CASE
3946 && ctx->ctx_res_w != RES_CASE
3947# endif
Denis Vlasenko733e3fb2008-07-06 10:01:13 +00003948 ) {
Denys Vlasenko5807e182018-02-08 19:19:04 +01003949 const struct reserved_combo *reserved;
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02003950 reserved = reserved_word(ctx);
Denys Vlasenko5807e182018-02-08 19:19:04 +01003951 debug_printf_parse("checking for reserved-ness: %d\n", !!reserved);
Denys Vlasenko29f9b722011-05-14 11:27:36 +02003952 if (reserved) {
Denys Vlasenko5807e182018-02-08 19:19:04 +01003953# if ENABLE_HUSH_LINENO_VAR
3954/* Case:
3955 * "while ...; do
3956 * cmd ..."
3957 * If we don't close the pipe _now_, immediately after "do", lineno logic
3958 * sees "cmd" as starting at "do" - i.e., at the previous line.
3959 */
3960 if (0
3961 IF_HUSH_IF(|| reserved->res == RES_THEN)
3962 IF_HUSH_IF(|| reserved->res == RES_ELIF)
3963 IF_HUSH_IF(|| reserved->res == RES_ELSE)
3964 IF_HUSH_LOOPS(|| reserved->res == RES_DO)
3965 ) {
3966 done_pipe(ctx, PIPE_SEQ);
3967 }
3968# endif
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02003969 o_reset_to_empty_unquoted(&ctx->word);
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00003970 debug_printf_parse("done_word return %d\n",
3971 (ctx->ctx_res_w == RES_SNTX));
Denis Vlasenko5ec61322008-06-24 00:50:07 +00003972 return (ctx->ctx_res_w == RES_SNTX);
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00003973 }
Denys Vlasenko11752d42018-04-03 08:20:58 +02003974# if defined(CMD_SINGLEWORD_NOGLOB)
3975 if (0
3976# if BASH_TEST2
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02003977 || strcmp(ctx->word.data, "[[") == 0
Denys Vlasenko11752d42018-04-03 08:20:58 +02003978# endif
3979 /* In bash, local/export/readonly are special, args
3980 * are assignments and therefore expansion of them
3981 * should be "one-word" expansion:
3982 * $ export i=`echo 'a b'` # one arg: "i=a b"
3983 * compare with:
3984 * $ ls i=`echo 'a b'` # two args: "i=a" and "b"
3985 * ls: cannot access i=a: No such file or directory
3986 * ls: cannot access b: No such file or directory
3987 * Note: bash 3.2.33(1) does this only if export word
3988 * itself is not quoted:
3989 * $ export i=`echo 'aaa bbb'`; echo "$i"
3990 * aaa bbb
3991 * $ "export" i=`echo 'aaa bbb'`; echo "$i"
3992 * aaa
3993 */
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02003994 IF_HUSH_LOCAL( || strcmp(ctx->word.data, "local") == 0)
3995 IF_HUSH_EXPORT( || strcmp(ctx->word.data, "export") == 0)
3996 IF_HUSH_READONLY(|| strcmp(ctx->word.data, "readonly") == 0)
Denys Vlasenko11752d42018-04-03 08:20:58 +02003997 ) {
Denys Vlasenko9d617c42009-06-09 18:40:52 +02003998 command->cmd_type = CMD_SINGLEWORD_NOGLOB;
3999 }
4000 /* fall through */
Denys Vlasenko9ca656b2009-06-10 13:39:35 +02004001# endif
Eric Andersen25f27032001-04-26 23:22:31 +00004002 }
Denys Vlasenko11752d42018-04-03 08:20:58 +02004003#endif /* HAS_KEYWORDS */
4004
Denis Vlasenkobb929512009-04-16 10:59:40 +00004005 if (command->group) {
4006 /* "{ echo foo; } echo bar" - bad */
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02004007 syntax_error_at(ctx->word.data);
Denis Vlasenkobb929512009-04-16 10:59:40 +00004008 debug_printf_parse("done_word return 1: syntax error, "
4009 "groups and arglists don't mix\n");
4010 return 1;
4011 }
Denys Vlasenko29f9b722011-05-14 11:27:36 +02004012
4013 /* If this word wasn't an assignment, next ones definitely
4014 * can't be assignments. Even if they look like ones. */
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02004015 if (ctx->is_assignment != DEFINITELY_ASSIGNMENT
4016 && ctx->is_assignment != WORD_IS_KEYWORD
Denys Vlasenko29f9b722011-05-14 11:27:36 +02004017 ) {
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02004018 ctx->is_assignment = NOT_ASSIGNMENT;
Denys Vlasenko29f9b722011-05-14 11:27:36 +02004019 } else {
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02004020 if (ctx->is_assignment == DEFINITELY_ASSIGNMENT) {
Denys Vlasenko29f9b722011-05-14 11:27:36 +02004021 command->assignment_cnt++;
4022 debug_printf_parse("++assignment_cnt=%d\n", command->assignment_cnt);
4023 }
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02004024 debug_printf_parse("ctx->is_assignment was:'%s'\n", assignment_flag[ctx->is_assignment]);
4025 ctx->is_assignment = MAYBE_ASSIGNMENT;
Denys Vlasenko29f9b722011-05-14 11:27:36 +02004026 }
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02004027 debug_printf_parse("ctx->is_assignment='%s'\n", assignment_flag[ctx->is_assignment]);
4028 command->argv = add_string_to_strings(command->argv, xstrdup(ctx->word.data));
Denis Vlasenko9af22c72008-10-09 12:54:58 +00004029 debug_print_strings("word appended to argv", command->argv);
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00004030 }
Eric Andersen25f27032001-04-26 23:22:31 +00004031
Denis Vlasenko06810332007-05-21 23:30:54 +00004032#if ENABLE_HUSH_LOOPS
Denis Vlasenko733e3fb2008-07-06 10:01:13 +00004033 if (ctx->ctx_res_w == RES_FOR) {
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02004034 if (ctx->word.has_quoted_part
Denis Vlasenko1fd1ea42009-04-10 12:03:20 +00004035 || !is_well_formed_var_name(command->argv[0], '\0')
4036 ) {
Denis Vlasenkob7d8c0d2009-04-10 19:05:43 +00004037 /* bash says just "not a valid identifier" */
Denis Vlasenko1fd1ea42009-04-10 12:03:20 +00004038 syntax_error("not a valid identifier in for");
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00004039 return 1;
4040 }
Denis Vlasenko1fd1ea42009-04-10 12:03:20 +00004041 /* Force FOR to have just one word (variable name) */
4042 /* NB: basically, this makes hush see "for v in ..."
4043 * syntax as if it is "for v; in ...". FOR and IN become
4044 * two pipe structs in parse tree. */
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00004045 done_pipe(ctx, PIPE_SEQ);
Denis Vlasenko733e3fb2008-07-06 10:01:13 +00004046 }
Denis Vlasenko06810332007-05-21 23:30:54 +00004047#endif
Denis Vlasenko17f02e72008-07-14 04:32:29 +00004048#if ENABLE_HUSH_CASE
4049 /* Force CASE to have just one word */
4050 if (ctx->ctx_res_w == RES_CASE) {
4051 done_pipe(ctx, PIPE_SEQ);
4052 }
4053#endif
Denis Vlasenko1fd1ea42009-04-10 12:03:20 +00004054
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02004055 o_reset_to_empty_unquoted(&ctx->word);
Denis Vlasenko1fd1ea42009-04-10 12:03:20 +00004056
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00004057 debug_printf_parse("done_word return 0\n");
Eric Andersen25f27032001-04-26 23:22:31 +00004058 return 0;
4059}
4060
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004061
4062/* Peek ahead in the input to find out if we have a "&n" construct,
4063 * as in "2>&1", that represents duplicating a file descriptor.
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00004064 * Return:
4065 * REDIRFD_CLOSE if >&- "close fd" construct is seen,
4066 * REDIRFD_SYNTAX_ERR if syntax error,
4067 * REDIRFD_TO_FILE if no & was seen,
4068 * or the number found.
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004069 */
4070#if BB_MMU
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00004071#define parse_redir_right_fd(as_string, input) \
4072 parse_redir_right_fd(input)
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004073#endif
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00004074static int parse_redir_right_fd(o_string *as_string, struct in_str *input)
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004075{
4076 int ch, d, ok;
4077
4078 ch = i_peek(input);
4079 if (ch != '&')
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00004080 return REDIRFD_TO_FILE;
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004081
4082 ch = i_getch(input); /* get the & */
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004083 nommu_addchr(as_string, ch);
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004084 ch = i_peek(input);
4085 if (ch == '-') {
4086 ch = i_getch(input);
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004087 nommu_addchr(as_string, ch);
Denis Vlasenko02d6f1a2009-04-07 19:56:55 +00004088 return REDIRFD_CLOSE;
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004089 }
4090 d = 0;
4091 ok = 0;
4092 while (ch != EOF && isdigit(ch)) {
4093 d = d*10 + (ch-'0');
4094 ok = 1;
4095 ch = i_getch(input);
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004096 nommu_addchr(as_string, ch);
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004097 ch = i_peek(input);
4098 }
4099 if (ok) return d;
4100
4101//TODO: this is the place to catch ">&file" bashism (redirect both fd 1 and 2)
4102
4103 bb_error_msg("ambiguous redirect");
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00004104 return REDIRFD_SYNTAX_ERR;
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004105}
4106
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00004107/* Return code is 0 normal, 1 if a syntax error is detected
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004108 */
4109static int parse_redirect(struct parse_context *ctx,
4110 int fd,
4111 redir_type style,
4112 struct in_str *input)
4113{
4114 struct command *command = ctx->command;
4115 struct redir_struct *redir;
4116 struct redir_struct **redirp;
4117 int dup_num;
4118
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00004119 dup_num = REDIRFD_TO_FILE;
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004120 if (style != REDIRECT_HEREDOC) {
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00004121 /* Check for a '>&1' type redirect */
4122 dup_num = parse_redir_right_fd(&ctx->as_string, input);
4123 if (dup_num == REDIRFD_SYNTAX_ERR)
4124 return 1;
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004125 } else {
Denys Vlasenkoa94eeb02018-03-31 20:16:31 +02004126 int ch = i_peek_and_eat_bkslash_nl(input);
Denis Vlasenko02d6f1a2009-04-07 19:56:55 +00004127 dup_num = (ch == '-'); /* HEREDOC_SKIPTABS bit is 1 */
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004128 if (dup_num) { /* <<-... */
4129 ch = i_getch(input);
4130 nommu_addchr(&ctx->as_string, ch);
4131 ch = i_peek(input);
4132 }
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004133 }
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004134
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00004135 if (style == REDIRECT_OVERWRITE && dup_num == REDIRFD_TO_FILE) {
Denys Vlasenkoa94eeb02018-03-31 20:16:31 +02004136 int ch = i_peek_and_eat_bkslash_nl(input);
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004137 if (ch == '|') {
4138 /* >|FILE redirect ("clobbering" >).
4139 * Since we do not support "set -o noclobber" yet,
4140 * >| and > are the same for now. Just eat |.
4141 */
4142 ch = i_getch(input);
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004143 nommu_addchr(&ctx->as_string, ch);
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004144 }
4145 }
4146
4147 /* Create a new redir_struct and append it to the linked list */
4148 redirp = &command->redirects;
4149 while ((redir = *redirp) != NULL) {
4150 redirp = &(redir->next);
4151 }
4152 *redirp = redir = xzalloc(sizeof(*redir));
4153 /* redir->next = NULL; */
4154 /* redir->rd_filename = NULL; */
4155 redir->rd_type = style;
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004156 redir->rd_fd = (fd == -1) ? redir_table[style].default_fd : fd;
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004157
Denis Vlasenko02d6f1a2009-04-07 19:56:55 +00004158 debug_printf_parse("redirect type %d %s\n", redir->rd_fd,
4159 redir_table[style].descrip);
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004160
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004161 redir->rd_dup = dup_num;
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00004162 if (style != REDIRECT_HEREDOC && dup_num != REDIRFD_TO_FILE) {
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004163 /* Erik had a check here that the file descriptor in question
4164 * is legit; I postpone that to "run time"
4165 * A "-" representation of "close me" shows up as a -3 here */
Denis Vlasenko02d6f1a2009-04-07 19:56:55 +00004166 debug_printf_parse("duplicating redirect '%d>&%d'\n",
4167 redir->rd_fd, redir->rd_dup);
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004168 } else {
Denys Vlasenkod6a37d82016-09-20 16:22:24 +02004169#if 0 /* Instead we emit error message at run time */
4170 if (ctx->pending_redirect) {
4171 /* For example, "cmd > <file" */
Denys Vlasenko39701202017-08-02 19:44:05 +02004172 syntax_error("invalid redirect");
Denys Vlasenkod6a37d82016-09-20 16:22:24 +02004173 }
4174#endif
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004175 /* Set ctx->pending_redirect, so we know what to do at the
4176 * end of the next parsed word. */
4177 ctx->pending_redirect = redir;
4178 }
4179 return 0;
4180}
4181
Eric Andersen25f27032001-04-26 23:22:31 +00004182/* If a redirect is immediately preceded by a number, that number is
4183 * supposed to tell which file descriptor to redirect. This routine
4184 * looks for such preceding numbers. In an ideal world this routine
4185 * needs to handle all the following classes of redirects...
4186 * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo
4187 * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo
4188 * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo
4189 * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004190 *
4191 * http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html
4192 * "2.7 Redirection
4193 * ... If n is quoted, the number shall not be recognized as part of
4194 * the redirection expression. For example:
4195 * echo \2>a
4196 * writes the character 2 into file a"
Denys Vlasenko38292b62010-09-05 14:49:40 +02004197 * We are getting it right by setting ->has_quoted_part on any \<char>
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004198 *
4199 * A -1 return means no valid number was found,
4200 * the caller should use the appropriate default for this redirection.
Eric Andersen25f27032001-04-26 23:22:31 +00004201 */
4202static int redirect_opt_num(o_string *o)
4203{
4204 int num;
4205
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004206 if (o->data == NULL)
Denis Vlasenkobb81c582007-01-30 22:32:09 +00004207 return -1;
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004208 num = bb_strtou(o->data, NULL, 10);
4209 if (errno || num < 0)
4210 return -1;
Denis Vlasenko0b677d82009-04-10 13:49:10 +00004211 o_reset_to_empty_unquoted(o);
Eric Andersen25f27032001-04-26 23:22:31 +00004212 return num;
4213}
4214
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004215#if BB_MMU
4216#define fetch_till_str(as_string, input, word, skip_tabs) \
4217 fetch_till_str(input, word, skip_tabs)
4218#endif
4219static char *fetch_till_str(o_string *as_string,
4220 struct in_str *input,
4221 const char *word,
Denys Vlasenko77b32cc2010-09-06 11:27:32 +02004222 int heredoc_flags)
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004223{
4224 o_string heredoc = NULL_O_STRING;
Denys Vlasenko5b6210c2010-09-09 13:32:21 +02004225 unsigned past_EOL;
Denys Vlasenko77b32cc2010-09-06 11:27:32 +02004226 int prev = 0; /* not \ */
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004227 int ch;
4228
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004229 goto jump_in;
Denys Vlasenkob8709032011-05-08 21:20:01 +02004230
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004231 while (1) {
4232 ch = i_getch(input);
Denys Vlasenko5b6210c2010-09-09 13:32:21 +02004233 if (ch != EOF)
4234 nommu_addchr(as_string, ch);
Denys Vlasenko0f018b32017-07-29 20:43:26 +02004235 if (ch == '\n' || ch == EOF) {
4236 check_heredoc_end:
4237 if ((heredoc_flags & HEREDOC_QUOTED) || prev != '\\') {
4238 if (strcmp(heredoc.data + past_EOL, word) == 0) {
4239 heredoc.data[past_EOL] = '\0';
4240 debug_printf_parse("parsed heredoc '%s'\n", heredoc.data);
4241 return heredoc.data;
4242 }
4243 if (ch == '\n') {
4244 /* This is a new line.
4245 * Remember position and backslash-escaping status.
4246 */
4247 o_addchr(&heredoc, ch);
4248 prev = ch;
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004249 jump_in:
Denys Vlasenko0f018b32017-07-29 20:43:26 +02004250 past_EOL = heredoc.length;
4251 /* Get 1st char of next line, possibly skipping leading tabs */
4252 do {
4253 ch = i_getch(input);
4254 if (ch != EOF)
4255 nommu_addchr(as_string, ch);
4256 } while ((heredoc_flags & HEREDOC_SKIPTABS) && ch == '\t');
4257 /* If this immediately ended the line,
4258 * go back to end-of-line checks.
4259 */
4260 if (ch == '\n')
4261 goto check_heredoc_end;
4262 }
Denys Vlasenko5b6210c2010-09-09 13:32:21 +02004263 }
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004264 }
4265 if (ch == EOF) {
4266 o_free_unsafe(&heredoc);
4267 return NULL;
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004268 }
4269 o_addchr(&heredoc, ch);
Denys Vlasenko5b6210c2010-09-09 13:32:21 +02004270 nommu_addchr(as_string, ch);
Denys Vlasenkoc3adfac2010-09-06 11:46:03 +02004271 if (prev == '\\' && ch == '\\')
4272 /* Correctly handle foo\\<eol> (not a line cont.) */
4273 prev = 0; /* not \ */
4274 else
4275 prev = ch;
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004276 }
4277}
4278
Denis Vlasenko3dfb0352009-04-08 09:29:14 +00004279/* Look at entire parse tree for not-yet-loaded REDIRECT_HEREDOCs
4280 * and load them all. There should be exactly heredoc_cnt of them.
4281 */
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004282static int fetch_heredocs(int heredoc_cnt, struct parse_context *ctx, struct in_str *input)
4283{
4284 struct pipe *pi = ctx->list_head;
4285
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00004286 while (pi && heredoc_cnt) {
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004287 int i;
4288 struct command *cmd = pi->cmds;
4289
4290 debug_printf_parse("fetch_heredocs: num_cmds:%d cmd argv0:'%s'\n",
4291 pi->num_cmds,
4292 cmd->argv ? cmd->argv[0] : "NONE");
4293 for (i = 0; i < pi->num_cmds; i++) {
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004294 struct redir_struct *redir = cmd->redirects;
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004295
4296 debug_printf_parse("fetch_heredocs: %d cmd argv0:'%s'\n",
4297 i, cmd->argv ? cmd->argv[0] : "NONE");
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004298 while (redir) {
4299 if (redir->rd_type == REDIRECT_HEREDOC) {
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004300 char *p;
4301
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004302 redir->rd_type = REDIRECT_HEREDOC2;
Denys Vlasenko764b2f02009-06-07 16:05:04 +02004303 /* redir->rd_dup is (ab)used to indicate <<- */
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004304 p = fetch_till_str(&ctx->as_string, input,
Denys Vlasenko77b32cc2010-09-06 11:27:32 +02004305 redir->rd_filename, redir->rd_dup);
Denis Vlasenko3dfb0352009-04-08 09:29:14 +00004306 if (!p) {
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00004307 syntax_error("unexpected EOF in here document");
Denis Vlasenko3dfb0352009-04-08 09:29:14 +00004308 return 1;
4309 }
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004310 free(redir->rd_filename);
4311 redir->rd_filename = p;
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004312 heredoc_cnt--;
4313 }
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004314 redir = redir->next;
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004315 }
4316 cmd++;
4317 }
4318 pi = pi->next;
4319 }
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00004320#if 0
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004321 /* Should be 0. If it isn't, it's a parse error */
Denis Vlasenko3dfb0352009-04-08 09:29:14 +00004322 if (heredoc_cnt)
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00004323 bb_error_msg_and_die("heredoc BUG 2");
4324#endif
4325 return 0;
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004326}
4327
4328
Denys Vlasenkob36abf22010-09-05 14:50:59 +02004329static int run_list(struct pipe *pi);
4330#if BB_MMU
4331#define parse_stream(pstring, input, end_trigger) \
4332 parse_stream(input, end_trigger)
4333#endif
4334static struct pipe *parse_stream(char **pstring,
4335 struct in_str *input,
4336 int end_trigger);
Denis Vlasenkoba7cf262007-05-25 14:34:30 +00004337
Eric Andersen25f27032001-04-26 23:22:31 +00004338
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02004339static int parse_group(struct parse_context *ctx,
Eric Andersen25f27032001-04-26 23:22:31 +00004340 struct in_str *input, int ch)
4341{
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02004342 /* ctx->word contains characters seen prior to ( or {.
Denis Vlasenko027e3fd2009-04-02 22:50:40 +00004343 * Typically it's empty, but for function defs,
Denis Vlasenko371de4a2008-10-14 12:43:13 +00004344 * it contains function name (without '()'). */
Denys Vlasenkofbf44852018-04-03 14:56:52 +02004345#if BB_MMU
4346# define as_string NULL
4347#else
4348 char *as_string = NULL;
4349#endif
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004350 struct pipe *pipe_list;
Denis Vlasenko240c2552009-04-03 03:45:05 +00004351 int endch;
Denis Vlasenko9af22c72008-10-09 12:54:58 +00004352 struct command *command = ctx->command;
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00004353
4354 debug_printf_parse("parse_group entered\n");
Denis Vlasenko371de4a2008-10-14 12:43:13 +00004355#if ENABLE_HUSH_FUNCTIONS
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02004356 if (ch == '(' && !ctx->word.has_quoted_part) {
4357 if (ctx->word.length)
4358 if (done_word(ctx))
Denis Vlasenkobb929512009-04-16 10:59:40 +00004359 return 1;
Denis Vlasenkoc0ea3292009-04-10 21:22:02 +00004360 if (!command->argv)
4361 goto skip; /* (... */
4362 if (command->argv[1]) { /* word word ... (... */
4363 syntax_error_unexpected_ch('(');
4364 return 1;
Denis Vlasenkob7d8c0d2009-04-10 19:05:43 +00004365 }
Denis Vlasenkoc0ea3292009-04-10 21:22:02 +00004366 /* it is "word(..." or "word (..." */
4367 do
4368 ch = i_getch(input);
4369 while (ch == ' ' || ch == '\t');
4370 if (ch != ')') {
4371 syntax_error_unexpected_ch(ch);
4372 return 1;
4373 }
4374 nommu_addchr(&ctx->as_string, ch);
4375 do
4376 ch = i_getch(input);
4377 while (ch == ' ' || ch == '\t' || ch == '\n');
Denys Vlasenkofbf44852018-04-03 14:56:52 +02004378 if (ch != '{' && ch != '(') {
Denis Vlasenkoc0ea3292009-04-10 21:22:02 +00004379 syntax_error_unexpected_ch(ch);
4380 return 1;
4381 }
4382 nommu_addchr(&ctx->as_string, ch);
Denys Vlasenko9d617c42009-06-09 18:40:52 +02004383 command->cmd_type = CMD_FUNCDEF;
Denis Vlasenkoc0ea3292009-04-10 21:22:02 +00004384 goto skip;
Denis Vlasenko371de4a2008-10-14 12:43:13 +00004385 }
4386#endif
Denys Vlasenkod8389ad2009-11-16 03:18:46 +01004387
4388#if 0 /* Prevented by caller */
Denis Vlasenkob7d8c0d2009-04-10 19:05:43 +00004389 if (command->argv /* word [word]{... */
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02004390 || ctx->word.length /* word{... */
4391 || ctx->word.has_quoted_part /* ""{... */
Denis Vlasenko9af22c72008-10-09 12:54:58 +00004392 ) {
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00004393 syntax_error(NULL);
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004394 debug_printf_parse("parse_group return 1: "
4395 "syntax error, groups and arglists don't mix\n");
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00004396 return 1;
Eric Andersen25f27032001-04-26 23:22:31 +00004397 }
Denys Vlasenkod8389ad2009-11-16 03:18:46 +01004398#endif
Denis Vlasenkob7d8c0d2009-04-10 19:05:43 +00004399
Denys Vlasenkofbf44852018-04-03 14:56:52 +02004400 IF_HUSH_FUNCTIONS(skip:)
4401
Denis Vlasenko240c2552009-04-03 03:45:05 +00004402 endch = '}';
Denis Vlasenko90e485c2007-05-23 15:22:50 +00004403 if (ch == '(') {
Denis Vlasenko240c2552009-04-03 03:45:05 +00004404 endch = ')';
Denys Vlasenkofbf44852018-04-03 14:56:52 +02004405 IF_HUSH_FUNCTIONS(if (command->cmd_type != CMD_FUNCDEF))
4406 command->cmd_type = CMD_SUBSHELL;
Denis Vlasenkof8c1f022009-04-17 11:55:42 +00004407 } else {
4408 /* bash does not allow "{echo...", requires whitespace */
Denys Vlasenko672a55e2016-11-04 18:46:14 +01004409 ch = i_peek(input);
4410 if (ch != ' ' && ch != '\t' && ch != '\n'
4411 && ch != '(' /* but "{(..." is allowed (without whitespace) */
4412 ) {
Denis Vlasenkof8c1f022009-04-17 11:55:42 +00004413 syntax_error_unexpected_ch(ch);
4414 return 1;
4415 }
Denys Vlasenko672a55e2016-11-04 18:46:14 +01004416 if (ch != '(') {
4417 ch = i_getch(input);
4418 nommu_addchr(&ctx->as_string, ch);
4419 }
Eric Andersen25f27032001-04-26 23:22:31 +00004420 }
Denis Vlasenkob7d8c0d2009-04-10 19:05:43 +00004421
Denys Vlasenkofbf44852018-04-03 14:56:52 +02004422 pipe_list = parse_stream(&as_string, input, endch);
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00004423#if !BB_MMU
Denys Vlasenkofbf44852018-04-03 14:56:52 +02004424 if (as_string)
4425 o_addstr(&ctx->as_string, as_string);
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00004426#endif
Denys Vlasenkofbf44852018-04-03 14:56:52 +02004427
4428 /* empty ()/{} or parse error? */
4429 if (!pipe_list || pipe_list == ERR_PTR) {
4430 /* parse_stream already emitted error msg */
4431 if (!BB_MMU)
4432 free(as_string);
4433 debug_printf_parse("parse_group return 1: "
4434 "parse_stream returned %p\n", pipe_list);
4435 return 1;
Denis Vlasenkof8d01d32008-06-14 17:13:20 +00004436 }
Denys Vlasenkofbf44852018-04-03 14:56:52 +02004437#if !BB_MMU
4438 as_string[strlen(as_string) - 1] = '\0'; /* plink ')' or '}' */
4439 command->group_as_string = as_string;
4440 debug_printf_parse("end of group, remembering as:'%s'\n",
4441 command->group_as_string);
4442#endif
4443
4444#if ENABLE_HUSH_FUNCTIONS
4445 /* Convert "f() (cmds)" to "f() {(cmds)}" */
4446 if (command->cmd_type == CMD_FUNCDEF && endch == ')') {
4447 struct command *cmd2;
4448
4449 cmd2 = xzalloc(sizeof(*cmd2));
4450 cmd2->cmd_type = CMD_SUBSHELL;
4451 cmd2->group = pipe_list;
4452# if !BB_MMU
4453//UNTESTED!
4454 cmd2->group_as_string = command->group_as_string;
4455 command->group_as_string = xasprintf("(%s)", command->group_as_string);
4456# endif
4457
4458 pipe_list = new_pipe();
4459 pipe_list->cmds = cmd2;
4460 pipe_list->num_cmds = 1;
4461 }
4462#endif
4463
4464 command->group = pipe_list;
4465
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004466 debug_printf_parse("parse_group return 0\n");
4467 return 0;
Denis Vlasenko9af22c72008-10-09 12:54:58 +00004468 /* command remains "open", available for possible redirects */
Denys Vlasenkofbf44852018-04-03 14:56:52 +02004469#undef as_string
Eric Andersen25f27032001-04-26 23:22:31 +00004470}
4471
Denys Vlasenko0b883582016-12-23 16:49:07 +01004472#if ENABLE_HUSH_TICK || ENABLE_FEATURE_SH_MATH || ENABLE_HUSH_DOLLAR_OPS
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004473/* Subroutines for copying $(...) and `...` things */
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004474static int add_till_backquote(o_string *dest, struct in_str *input, int in_dquote);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004475/* '...' */
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004476static int add_till_single_quote(o_string *dest, struct in_str *input)
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004477{
4478 while (1) {
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00004479 int ch = i_getch(input);
Denis Vlasenko5c090a92009-04-08 21:51:33 +00004480 if (ch == EOF) {
Denis Vlasenkod68ae082009-04-09 20:41:34 +00004481 syntax_error_unterm_ch('\'');
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004482 return 0;
Denis Vlasenko5c090a92009-04-08 21:51:33 +00004483 }
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004484 if (ch == '\'')
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004485 return 1;
Denis Vlasenko82dfec32008-06-16 12:47:11 +00004486 o_addchr(dest, ch);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004487 }
4488}
4489/* "...\"...`..`...." - do we need to handle "...$(..)..." too? */
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004490static int add_till_double_quote(o_string *dest, struct in_str *input)
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004491{
4492 while (1) {
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00004493 int ch = i_getch(input);
Denis Vlasenko5c090a92009-04-08 21:51:33 +00004494 if (ch == EOF) {
Denis Vlasenkod68ae082009-04-09 20:41:34 +00004495 syntax_error_unterm_ch('"');
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004496 return 0;
Denis Vlasenko5c090a92009-04-08 21:51:33 +00004497 }
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004498 if (ch == '"')
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004499 return 1;
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004500 if (ch == '\\') { /* \x. Copy both chars. */
Denis Vlasenko82dfec32008-06-16 12:47:11 +00004501 o_addchr(dest, ch);
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00004502 ch = i_getch(input);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004503 }
Denis Vlasenko82dfec32008-06-16 12:47:11 +00004504 o_addchr(dest, ch);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004505 if (ch == '`') {
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004506 if (!add_till_backquote(dest, input, /*in_dquote:*/ 1))
4507 return 0;
Denis Vlasenko82dfec32008-06-16 12:47:11 +00004508 o_addchr(dest, ch);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004509 continue;
4510 }
Denis Vlasenko5703c222008-06-15 11:49:42 +00004511 //if (ch == '$') ...
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004512 }
4513}
4514/* Process `cmd` - copy contents until "`" is seen. Complicated by
4515 * \` quoting.
4516 * "Within the backquoted style of command substitution, backslash
4517 * shall retain its literal meaning, except when followed by: '$', '`', or '\'.
4518 * The search for the matching backquote shall be satisfied by the first
4519 * backquote found without a preceding backslash; during this search,
4520 * if a non-escaped backquote is encountered within a shell comment,
4521 * a here-document, an embedded command substitution of the $(command)
4522 * form, or a quoted string, undefined results occur. A single-quoted
4523 * or double-quoted string that begins, but does not end, within the
4524 * "`...`" sequence produces undefined results."
4525 * Example Output
4526 * echo `echo '\'TEST\`echo ZZ\`BEST` \TESTZZBEST
4527 */
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004528static int add_till_backquote(o_string *dest, struct in_str *input, int in_dquote)
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004529{
4530 while (1) {
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00004531 int ch = i_getch(input);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004532 if (ch == '`')
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004533 return 1;
Denis Vlasenko5c090a92009-04-08 21:51:33 +00004534 if (ch == '\\') {
Denys Vlasenkoacd5bc82010-09-12 15:05:39 +02004535 /* \x. Copy both unless it is \`, \$, \\ and maybe \" */
4536 ch = i_getch(input);
4537 if (ch != '`'
4538 && ch != '$'
4539 && ch != '\\'
4540 && (!in_dquote || ch != '"')
4541 ) {
4542 o_addchr(dest, '\\');
Denis Vlasenko5c090a92009-04-08 21:51:33 +00004543 }
Denys Vlasenkoacd5bc82010-09-12 15:05:39 +02004544 }
4545 if (ch == EOF) {
4546 syntax_error_unterm_ch('`');
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004547 return 0;
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004548 }
Denis Vlasenko82dfec32008-06-16 12:47:11 +00004549 o_addchr(dest, ch);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004550 }
4551}
4552/* Process $(cmd) - copy contents until ")" is seen. Complicated by
4553 * quoting and nested ()s.
4554 * "With the $(command) style of command substitution, all characters
4555 * following the open parenthesis to the matching closing parenthesis
4556 * constitute the command. Any valid shell script can be used for command,
4557 * except a script consisting solely of redirections which produces
4558 * unspecified results."
4559 * Example Output
4560 * echo $(echo '(TEST)' BEST) (TEST) BEST
4561 * echo $(echo 'TEST)' BEST) TEST) BEST
4562 * echo $(echo \(\(TEST\) BEST) ((TEST) BEST
Denys Vlasenko74369502010-05-21 19:52:01 +02004563 *
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004564 * Also adapted to eat ${var%...} and $((...)) constructs, since ... part
Denys Vlasenkoa6ad3972010-05-22 00:26:06 +02004565 * can contain arbitrary constructs, just like $(cmd).
Denys Vlasenko36f774a2010-09-05 14:45:38 +02004566 * In bash compat mode, it needs to also be able to stop on ':' or '/'
4567 * for ${var:N[:M]} and ${var/P[/R]} parsing.
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004568 */
Denys Vlasenko74369502010-05-21 19:52:01 +02004569#define DOUBLE_CLOSE_CHAR_FLAG 0x80
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004570static int add_till_closing_bracket(o_string *dest, struct in_str *input, unsigned end_ch)
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004571{
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004572 int ch;
Denys Vlasenko74369502010-05-21 19:52:01 +02004573 char dbl = end_ch & DOUBLE_CLOSE_CHAR_FLAG;
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01004574# if BASH_SUBSTR || BASH_PATTERN_SUBST
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004575 char end_char2 = end_ch >> 8;
Denys Vlasenko9297dbc2010-07-05 21:37:12 +02004576# endif
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004577 end_ch &= (DOUBLE_CLOSE_CHAR_FLAG - 1);
4578
Denys Vlasenko8d6eab32018-04-07 17:01:31 +02004579 G.promptmode = 1; /* PS2 */
4580 debug_printf_prompt("%s promptmode=%d\n", __func__, G.promptmode);
4581
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004582 while (1) {
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004583 ch = i_getch(input);
Denis Vlasenko5c090a92009-04-08 21:51:33 +00004584 if (ch == EOF) {
Denys Vlasenkoa6ad3972010-05-22 00:26:06 +02004585 syntax_error_unterm_ch(end_ch);
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004586 return 0;
Denis Vlasenko5c090a92009-04-08 21:51:33 +00004587 }
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01004588 if (ch == end_ch
4589# if BASH_SUBSTR || BASH_PATTERN_SUBST
Denys Vlasenko55f81332018-03-02 18:12:12 +01004590 || ch == end_char2
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01004591# endif
4592 ) {
Denys Vlasenkoa6ad3972010-05-22 00:26:06 +02004593 if (!dbl)
4594 break;
4595 /* we look for closing )) of $((EXPR)) */
Denys Vlasenko657086a2016-09-29 18:07:42 +02004596 if (i_peek_and_eat_bkslash_nl(input) == end_ch) {
Denys Vlasenkoa6ad3972010-05-22 00:26:06 +02004597 i_getch(input); /* eat second ')' */
4598 break;
Mike Frysinger98c52642009-04-02 10:02:37 +00004599 }
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004600 }
Denis Vlasenko82dfec32008-06-16 12:47:11 +00004601 o_addchr(dest, ch);
Denys Vlasenkod4802c62018-03-02 20:48:36 +01004602 //bb_error_msg("%s:o_addchr('%c')", __func__, ch);
Denys Vlasenkoa6ad3972010-05-22 00:26:06 +02004603 if (ch == '(' || ch == '{') {
4604 ch = (ch == '(' ? ')' : '}');
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004605 if (!add_till_closing_bracket(dest, input, ch))
4606 return 0;
Denys Vlasenkoa6ad3972010-05-22 00:26:06 +02004607 o_addchr(dest, ch);
4608 continue;
4609 }
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004610 if (ch == '\'') {
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004611 if (!add_till_single_quote(dest, input))
4612 return 0;
Denis Vlasenko82dfec32008-06-16 12:47:11 +00004613 o_addchr(dest, ch);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004614 continue;
4615 }
4616 if (ch == '"') {
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004617 if (!add_till_double_quote(dest, input))
4618 return 0;
Denis Vlasenko82dfec32008-06-16 12:47:11 +00004619 o_addchr(dest, ch);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004620 continue;
4621 }
Denys Vlasenkoa6ad3972010-05-22 00:26:06 +02004622 if (ch == '`') {
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004623 if (!add_till_backquote(dest, input, /*in_dquote:*/ 0))
4624 return 0;
Denys Vlasenkoa6ad3972010-05-22 00:26:06 +02004625 o_addchr(dest, ch);
4626 continue;
4627 }
Denis Vlasenko5c090a92009-04-08 21:51:33 +00004628 if (ch == '\\') {
4629 /* \x. Copy verbatim. Important for \(, \) */
Denis Vlasenko76db5ad2008-06-12 12:58:20 +00004630 ch = i_getch(input);
Denis Vlasenko5c090a92009-04-08 21:51:33 +00004631 if (ch == EOF) {
Denys Vlasenkod4802c62018-03-02 20:48:36 +01004632 syntax_error_unterm_ch(end_ch);
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004633 return 0;
Denis Vlasenko5c090a92009-04-08 21:51:33 +00004634 }
Denys Vlasenko657086a2016-09-29 18:07:42 +02004635#if 0
4636 if (ch == '\n') {
4637 /* "backslash+newline", ignore both */
4638 o_delchr(dest); /* undo insertion of '\' */
4639 continue;
4640 }
4641#endif
Denis Vlasenko82dfec32008-06-16 12:47:11 +00004642 o_addchr(dest, ch);
Denys Vlasenkod4802c62018-03-02 20:48:36 +01004643 //bb_error_msg("%s:o_addchr('%c') after '\\'", __func__, ch);
Denis Vlasenko76db5ad2008-06-12 12:58:20 +00004644 continue;
4645 }
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004646 }
Denys Vlasenko8d6eab32018-04-07 17:01:31 +02004647 debug_printf_parse("%s return '%s' ch:'%c'\n", __func__, dest->data, ch);
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004648 return ch;
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004649}
Denys Vlasenko0b883582016-12-23 16:49:07 +01004650#endif /* ENABLE_HUSH_TICK || ENABLE_FEATURE_SH_MATH || ENABLE_HUSH_DOLLAR_OPS */
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004651
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00004652/* Return code: 0 for OK, 1 for syntax error */
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004653#if BB_MMU
Denys Vlasenko101a4e32010-09-09 14:04:57 +02004654#define parse_dollar(as_string, dest, input, quote_mask) \
4655 parse_dollar(dest, input, quote_mask)
Denys Vlasenkoddc62f62010-05-22 00:53:32 +02004656#define as_string NULL
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004657#endif
Denys Vlasenko2e48d532010-05-22 17:30:39 +02004658static int parse_dollar(o_string *as_string,
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004659 o_string *dest,
Denys Vlasenko101a4e32010-09-09 14:04:57 +02004660 struct in_str *input, unsigned char quote_mask)
Eric Andersen25f27032001-04-26 23:22:31 +00004661{
Denys Vlasenko657086a2016-09-29 18:07:42 +02004662 int ch = i_peek_and_eat_bkslash_nl(input); /* first character after the $ */
Denis Vlasenkoe0a33672007-05-10 23:06:55 +00004663
Denys Vlasenko2e48d532010-05-22 17:30:39 +02004664 debug_printf_parse("parse_dollar entered: ch='%c'\n", ch);
Denis Vlasenko1f4cf512007-05-16 10:39:24 +00004665 if (isalpha(ch)) {
Denys Vlasenko0ca31982018-01-25 13:20:50 +01004666 make_var:
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004667 ch = i_getch(input);
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004668 nommu_addchr(as_string, ch);
Denys Vlasenko0ca31982018-01-25 13:20:50 +01004669 /*make_var1:*/
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00004670 o_addchr(dest, SPECIAL_VAR_SYMBOL);
Denis Vlasenkoe0a33672007-05-10 23:06:55 +00004671 while (1) {
Denis Vlasenkoe0a33672007-05-10 23:06:55 +00004672 debug_printf_parse(": '%c'\n", ch);
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00004673 o_addchr(dest, ch | quote_mask);
Denis Vlasenko1f4cf512007-05-16 10:39:24 +00004674 quote_mask = 0;
Denys Vlasenko657086a2016-09-29 18:07:42 +02004675 ch = i_peek_and_eat_bkslash_nl(input);
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02004676 if (!isalnum(ch) && ch != '_') {
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02004677 /* End of variable name reached */
Denis Vlasenko602d13c2007-05-13 18:34:53 +00004678 break;
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02004679 }
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004680 ch = i_getch(input);
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004681 nommu_addchr(as_string, ch);
Eric Andersen25f27032001-04-26 23:22:31 +00004682 }
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00004683 o_addchr(dest, SPECIAL_VAR_SYMBOL);
Eric Andersen25f27032001-04-26 23:22:31 +00004684 } else if (isdigit(ch)) {
Denis Vlasenko602d13c2007-05-13 18:34:53 +00004685 make_one_char_var:
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004686 ch = i_getch(input);
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004687 nommu_addchr(as_string, ch);
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00004688 o_addchr(dest, SPECIAL_VAR_SYMBOL);
Denis Vlasenko602d13c2007-05-13 18:34:53 +00004689 debug_printf_parse(": '%c'\n", ch);
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00004690 o_addchr(dest, ch | quote_mask);
4691 o_addchr(dest, SPECIAL_VAR_SYMBOL);
Eric Andersen25f27032001-04-26 23:22:31 +00004692 } else switch (ch) {
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004693 case '$': /* pid */
4694 case '!': /* last bg pid */
4695 case '?': /* last exit code */
4696 case '#': /* number of args */
4697 case '*': /* args */
4698 case '@': /* args */
4699 goto make_one_char_var;
4700 case '{': {
Denys Vlasenko2093ad22017-07-26 00:07:27 +02004701 char len_single_ch;
4702
Mike Frysingeref3e7fd2009-06-01 14:13:39 -04004703 o_addchr(dest, SPECIAL_VAR_SYMBOL);
4704
Denys Vlasenko74369502010-05-21 19:52:01 +02004705 ch = i_getch(input); /* eat '{' */
4706 nommu_addchr(as_string, ch);
4707
Denys Vlasenko46e64982016-09-29 19:50:55 +02004708 ch = i_getch_and_eat_bkslash_nl(input); /* first char after '{' */
Denys Vlasenko74369502010-05-21 19:52:01 +02004709 /* It should be ${?}, or ${#var},
4710 * or even ${?+subst} - operator acting on a special variable,
4711 * or the beginning of variable name.
4712 */
Denys Vlasenko101a4e32010-09-09 14:04:57 +02004713 if (ch == EOF
4714 || (!strchr(_SPECIAL_VARS_STR, ch) && !isalnum(ch)) /* not one of those */
4715 ) {
Denys Vlasenko74369502010-05-21 19:52:01 +02004716 bad_dollar_syntax:
4717 syntax_error_unterm_str("${name}");
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004718 debug_printf_parse("parse_dollar return 0: unterminated ${name}\n");
4719 return 0;
Denys Vlasenko74369502010-05-21 19:52:01 +02004720 }
Denys Vlasenko101a4e32010-09-09 14:04:57 +02004721 nommu_addchr(as_string, ch);
Denys Vlasenko2093ad22017-07-26 00:07:27 +02004722 len_single_ch = ch;
Denys Vlasenko74369502010-05-21 19:52:01 +02004723 ch |= quote_mask;
4724
Denys Vlasenkoddc62f62010-05-22 00:53:32 +02004725 /* It's possible to just call add_till_closing_bracket() at this point.
Denys Vlasenko74369502010-05-21 19:52:01 +02004726 * However, this regresses some of our testsuite cases
4727 * which check invalid constructs like ${%}.
4728 * Oh well... let's check that the var name part is fine... */
4729
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004730 while (1) {
Denys Vlasenkoddc62f62010-05-22 00:53:32 +02004731 unsigned pos;
4732
Denys Vlasenko74369502010-05-21 19:52:01 +02004733 o_addchr(dest, ch);
4734 debug_printf_parse(": '%c'\n", ch);
4735
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004736 ch = i_getch(input);
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004737 nommu_addchr(as_string, ch);
Denys Vlasenko74369502010-05-21 19:52:01 +02004738 if (ch == '}')
Mike Frysinger98c52642009-04-02 10:02:37 +00004739 break;
Mike Frysinger98c52642009-04-02 10:02:37 +00004740
Denys Vlasenko74369502010-05-21 19:52:01 +02004741 if (!isalnum(ch) && ch != '_') {
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004742 unsigned end_ch;
4743 unsigned char last_ch;
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004744 /* handle parameter expansions
4745 * http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_06_02
4746 */
Denys Vlasenko2093ad22017-07-26 00:07:27 +02004747 if (!strchr(VAR_SUBST_OPS, ch)) { /* ${var<bad_char>... */
4748 if (len_single_ch != '#'
4749 /*|| !strchr(SPECIAL_VARS_STR, ch) - disallow errors like ${#+} ? */
4750 || i_peek(input) != '}'
4751 ) {
4752 goto bad_dollar_syntax;
4753 }
4754 /* else: it's "length of C" ${#C} op,
4755 * where C is a single char
4756 * special var name, e.g. ${#!}.
4757 */
4758 }
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004759 /* Eat everything until closing '}' (or ':') */
4760 end_ch = '}';
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01004761 if (BASH_SUBSTR
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004762 && ch == ':'
Denys Vlasenko36f774a2010-09-05 14:45:38 +02004763 && !strchr(MINUS_PLUS_EQUAL_QUESTION, i_peek(input))
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004764 ) {
4765 /* It's ${var:N[:M]} thing */
4766 end_ch = '}' * 0x100 + ':';
4767 }
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01004768 if (BASH_PATTERN_SUBST
Denys Vlasenko36f774a2010-09-05 14:45:38 +02004769 && ch == '/'
4770 ) {
4771 /* It's ${var/[/]pattern[/repl]} thing */
4772 if (i_peek(input) == '/') { /* ${var//pattern[/repl]}? */
4773 i_getch(input);
4774 nommu_addchr(as_string, '/');
4775 ch = '\\';
4776 }
4777 end_ch = '}' * 0x100 + '/';
4778 }
4779 o_addchr(dest, ch);
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004780 again:
Denys Vlasenkoddc62f62010-05-22 00:53:32 +02004781 if (!BB_MMU)
4782 pos = dest->length;
Denys Vlasenko9297dbc2010-07-05 21:37:12 +02004783#if ENABLE_HUSH_DOLLAR_OPS
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004784 last_ch = add_till_closing_bracket(dest, input, end_ch);
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004785 if (last_ch == 0) /* error? */
4786 return 0;
Denys Vlasenko9297dbc2010-07-05 21:37:12 +02004787#else
4788#error Simple code to only allow ${var} is not implemented
4789#endif
Denys Vlasenkoddc62f62010-05-22 00:53:32 +02004790 if (as_string) {
4791 o_addstr(as_string, dest->data + pos);
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004792 o_addchr(as_string, last_ch);
Denys Vlasenkoddc62f62010-05-22 00:53:32 +02004793 }
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004794
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01004795 if ((BASH_SUBSTR || BASH_PATTERN_SUBST)
4796 && (end_ch & 0xff00)
4797 ) {
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004798 /* close the first block: */
4799 o_addchr(dest, SPECIAL_VAR_SYMBOL);
Denys Vlasenko36f774a2010-09-05 14:45:38 +02004800 /* while parsing N from ${var:N[:M]}
4801 * or pattern from ${var/[/]pattern[/repl]} */
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004802 if ((end_ch & 0xff) == last_ch) {
Denys Vlasenko36f774a2010-09-05 14:45:38 +02004803 /* got ':' or '/'- parse the rest */
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004804 end_ch = '}';
4805 goto again;
4806 }
Denys Vlasenko36f774a2010-09-05 14:45:38 +02004807 /* got '}' */
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01004808 if (BASH_SUBSTR && end_ch == '}' * 0x100 + ':') {
Denys Vlasenko36f774a2010-09-05 14:45:38 +02004809 /* it's ${var:N} - emulate :999999999 */
4810 o_addstr(dest, "999999999");
4811 } /* else: it's ${var/[/]pattern} */
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004812 }
Denys Vlasenko74369502010-05-21 19:52:01 +02004813 break;
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004814 }
Denys Vlasenko2093ad22017-07-26 00:07:27 +02004815 len_single_ch = 0; /* it can't be ${#C} op */
Denys Vlasenko74369502010-05-21 19:52:01 +02004816 }
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004817 o_addchr(dest, SPECIAL_VAR_SYMBOL);
4818 break;
4819 }
Denys Vlasenko0b883582016-12-23 16:49:07 +01004820#if ENABLE_FEATURE_SH_MATH || ENABLE_HUSH_TICK
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004821 case '(': {
Denys Vlasenkoddc62f62010-05-22 00:53:32 +02004822 unsigned pos;
4823
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004824 ch = i_getch(input);
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004825 nommu_addchr(as_string, ch);
Denys Vlasenko0b883582016-12-23 16:49:07 +01004826# if ENABLE_FEATURE_SH_MATH
Denys Vlasenko657086a2016-09-29 18:07:42 +02004827 if (i_peek_and_eat_bkslash_nl(input) == '(') {
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004828 ch = i_getch(input);
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004829 nommu_addchr(as_string, ch);
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004830 o_addchr(dest, SPECIAL_VAR_SYMBOL);
4831 o_addchr(dest, /*quote_mask |*/ '+');
Denys Vlasenkoddc62f62010-05-22 00:53:32 +02004832 if (!BB_MMU)
4833 pos = dest->length;
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004834 if (!add_till_closing_bracket(dest, input, ')' | DOUBLE_CLOSE_CHAR_FLAG))
4835 return 0; /* error */
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00004836 if (as_string) {
4837 o_addstr(as_string, dest->data + pos);
4838 o_addchr(as_string, ')');
4839 o_addchr(as_string, ')');
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00004840 }
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004841 o_addchr(dest, SPECIAL_VAR_SYMBOL);
Eric Andersen25f27032001-04-26 23:22:31 +00004842 break;
Denis Vlasenko76db5ad2008-06-12 12:58:20 +00004843 }
Denis Vlasenkod85a5df2009-04-05 08:43:57 +00004844# endif
4845# if ENABLE_HUSH_TICK
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004846 o_addchr(dest, SPECIAL_VAR_SYMBOL);
4847 o_addchr(dest, quote_mask | '`');
Denys Vlasenkoddc62f62010-05-22 00:53:32 +02004848 if (!BB_MMU)
4849 pos = dest->length;
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004850 if (!add_till_closing_bracket(dest, input, ')'))
4851 return 0; /* error */
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00004852 if (as_string) {
4853 o_addstr(as_string, dest->data + pos);
Denys Vlasenkob70cef72010-01-12 13:45:45 +01004854 o_addchr(as_string, ')');
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00004855 }
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004856 o_addchr(dest, SPECIAL_VAR_SYMBOL);
Denis Vlasenkod85a5df2009-04-05 08:43:57 +00004857# endif
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004858 break;
4859 }
Denis Vlasenkod85a5df2009-04-05 08:43:57 +00004860#endif
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004861 case '_':
Denys Vlasenko0ca31982018-01-25 13:20:50 +01004862 goto make_var;
4863#if 0
Denys Vlasenko69b1cef2009-09-21 10:21:44 +02004864 /* TODO: $_ and $-: */
4865 /* $_ Shell or shell script name; or last argument of last command
4866 * (if last command wasn't a pipe; if it was, bash sets $_ to "");
4867 * but in command's env, set to full pathname used to invoke it */
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004868 /* $- Option flags set by set builtin or shell options (-i etc) */
Denys Vlasenko0ca31982018-01-25 13:20:50 +01004869 ch = i_getch(input);
4870 nommu_addchr(as_string, ch);
4871 ch = i_peek_and_eat_bkslash_nl(input);
4872 if (isalnum(ch)) { /* it's $_name or $_123 */
4873 ch = '_';
4874 goto make_var1;
4875 }
4876 /* else: it's $_ */
4877#endif
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004878 default:
4879 o_addQchr(dest, '$');
Eric Andersen25f27032001-04-26 23:22:31 +00004880 }
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004881 debug_printf_parse("parse_dollar return 1 (ok)\n");
4882 return 1;
Denys Vlasenkoddc62f62010-05-22 00:53:32 +02004883#undef as_string
Eric Andersen25f27032001-04-26 23:22:31 +00004884}
4885
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00004886#if BB_MMU
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01004887# if BASH_PATTERN_SUBST
Denys Vlasenkod98e5c62010-09-10 10:44:23 +02004888#define encode_string(as_string, dest, input, dquote_end, process_bkslash) \
4889 encode_string(dest, input, dquote_end, process_bkslash)
4890# else
4891/* only ${var/pattern/repl} (its pattern part) needs additional mode */
4892#define encode_string(as_string, dest, input, dquote_end, process_bkslash) \
4893 encode_string(dest, input, dquote_end)
4894# endif
Denys Vlasenkoddc62f62010-05-22 00:53:32 +02004895#define as_string NULL
Denys Vlasenkod98e5c62010-09-10 10:44:23 +02004896
4897#else /* !MMU */
4898
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01004899# if BASH_PATTERN_SUBST
Denys Vlasenkod98e5c62010-09-10 10:44:23 +02004900/* all parameters are needed, no macro tricks */
4901# else
4902#define encode_string(as_string, dest, input, dquote_end, process_bkslash) \
4903 encode_string(as_string, dest, input, dquote_end)
4904# endif
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00004905#endif
Denys Vlasenkod98e5c62010-09-10 10:44:23 +02004906static int encode_string(o_string *as_string,
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00004907 o_string *dest,
4908 struct in_str *input,
Denys Vlasenko14e289b2010-09-10 10:15:18 +02004909 int dquote_end,
Denys Vlasenkod98e5c62010-09-10 10:44:23 +02004910 int process_bkslash)
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004911{
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01004912#if !BASH_PATTERN_SUBST
Denys Vlasenkod98e5c62010-09-10 10:44:23 +02004913 const int process_bkslash = 1;
4914#endif
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00004915 int ch;
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004916 int next;
4917
4918 again:
4919 ch = i_getch(input);
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004920 if (ch != EOF)
4921 nommu_addchr(as_string, ch);
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004922 if (ch == dquote_end) { /* may be only '"' or EOF */
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004923 debug_printf_parse("encode_string return 1 (ok)\n");
4924 return 1;
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004925 }
Denis Vlasenko3dfb0352009-04-08 09:29:14 +00004926 /* note: can't move it above ch == dquote_end check! */
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004927 if (ch == EOF) {
Denis Vlasenkod68ae082009-04-09 20:41:34 +00004928 syntax_error_unterm_ch('"');
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004929 return 0; /* error */
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004930 }
4931 next = '\0';
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004932 if (ch != '\n') {
4933 next = i_peek(input);
4934 }
Denys Vlasenkof37eb392009-10-18 11:46:35 +02004935 debug_printf_parse("\" ch=%c (%d) escape=%d\n",
Denys Vlasenko5b686cb2010-09-08 13:44:34 +02004936 ch, ch, !!(dest->o_expflags & EXP_FLAG_ESC_GLOB_CHARS));
Denys Vlasenkod98e5c62010-09-10 10:44:23 +02004937 if (process_bkslash && ch == '\\') {
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004938 if (next == EOF) {
Denys Vlasenko4709df02018-04-10 14:49:01 +02004939 /* Testcase: in interactive shell a file with
4940 * echo "unterminated string\<eof>
4941 * is sourced.
4942 */
4943 syntax_error_unterm_ch('"');
4944 return 0; /* error */
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004945 }
4946 /* bash:
4947 * "The backslash retains its special meaning [in "..."]
4948 * only when followed by one of the following characters:
4949 * $, `, ", \, or <newline>. A double quote may be quoted
Denys Vlasenkoe640cb42009-05-28 16:49:11 +02004950 * within double quotes by preceding it with a backslash."
Denys Vlasenkod98e5c62010-09-10 10:44:23 +02004951 * NB: in (unquoted) heredoc, above does not apply to ",
4952 * therefore we check for it by "next == dquote_end" cond.
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004953 */
Denys Vlasenkod98e5c62010-09-10 10:44:23 +02004954 if (next == dquote_end || strchr("$`\\\n", next)) {
Denys Vlasenko850b15b2010-09-09 12:58:19 +02004955 ch = i_getch(input); /* eat next */
4956 if (ch == '\n')
4957 goto again; /* skip \<newline> */
Denys Vlasenko4f870492010-09-10 11:06:01 +02004958 } /* else: ch remains == '\\', and we double it below: */
4959 o_addqchr(dest, ch); /* \c if c is a glob char, else just c */
Denys Vlasenko850b15b2010-09-09 12:58:19 +02004960 nommu_addchr(as_string, ch);
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004961 goto again;
4962 }
4963 if (ch == '$') {
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004964 if (!parse_dollar(as_string, dest, input, /*quote_mask:*/ 0x80)) {
4965 debug_printf_parse("encode_string return 0: "
4966 "parse_dollar returned 0 (error)\n");
4967 return 0;
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004968 }
4969 goto again;
4970 }
4971#if ENABLE_HUSH_TICK
4972 if (ch == '`') {
Denys Vlasenkoddc62f62010-05-22 00:53:32 +02004973 //unsigned pos = dest->length;
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004974 o_addchr(dest, SPECIAL_VAR_SYMBOL);
4975 o_addchr(dest, 0x80 | '`');
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004976 if (!add_till_backquote(dest, input, /*in_dquote:*/ dquote_end == '"'))
4977 return 0; /* error */
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004978 o_addchr(dest, SPECIAL_VAR_SYMBOL);
4979 //debug_printf_subst("SUBST RES3 '%s'\n", dest->data + pos);
Denis Vlasenkof328e002009-04-02 16:55:38 +00004980 goto again;
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004981 }
4982#endif
Denis Vlasenkof328e002009-04-02 16:55:38 +00004983 o_addQchr(dest, ch);
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004984 goto again;
Denys Vlasenkoddc62f62010-05-22 00:53:32 +02004985#undef as_string
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004986}
4987
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004988/*
4989 * Scan input until EOF or end_trigger char.
4990 * Return a list of pipes to execute, or NULL on EOF
4991 * or if end_trigger character is met.
Denys Vlasenkocecbc982011-03-30 18:54:52 +02004992 * On syntax error, exit if shell is not interactive,
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004993 * reset parsing machinery and start parsing anew,
4994 * or return ERR_PTR.
Denis Vlasenko027e3fd2009-04-02 22:50:40 +00004995 */
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00004996static struct pipe *parse_stream(char **pstring,
4997 struct in_str *input,
4998 int end_trigger)
Eric Andersen25f27032001-04-26 23:22:31 +00004999{
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005000 struct parse_context ctx;
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00005001 int heredoc_cnt;
Eric Andersen25f27032001-04-26 23:22:31 +00005002
Denys Vlasenko77a7b552010-09-09 12:40:03 +02005003 /* Single-quote triggers a bypass of the main loop until its mate is
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005004 * found. When recursing, quote state is passed in via ctx.word.o_expflags.
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00005005 */
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005006 debug_printf_parse("parse_stream entered, end_trigger='%c'\n",
Denys Vlasenko90a99042009-09-06 02:36:23 +02005007 end_trigger ? end_trigger : 'X');
Denis Vlasenko0701dca2009-04-11 10:38:47 +00005008 debug_enter();
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00005009
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005010 initialize_context(&ctx);
5011
5012 /* If very first arg is "" or '', ctx.word.data may end up NULL.
5013 * Preventing this:
5014 */
5015 o_addchr(&ctx.word, '\0');
5016 ctx.word.length = 0;
Denys Vlasenkof37eb392009-10-18 11:46:35 +02005017
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02005018 /* We used to separate words on $IFS here. This was wrong.
5019 * $IFS is used only for word splitting when $var is expanded,
Denys Vlasenko77a7b552010-09-09 12:40:03 +02005020 * here we should use blank chars as separators, not $IFS
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02005021 */
Denys Vlasenko77a7b552010-09-09 12:40:03 +02005022
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00005023 heredoc_cnt = 0;
Denis Vlasenko1a735862007-05-23 00:32:25 +00005024 while (1) {
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02005025 const char *is_blank;
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00005026 const char *is_special;
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00005027 int ch;
5028 int next;
5029 int redir_fd;
5030 redir_type redir_style;
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00005031
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00005032 ch = i_getch(input);
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00005033 debug_printf_parse(": ch=%c (%d) escape=%d\n",
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005034 ch, ch, !!(ctx.word.o_expflags & EXP_FLAG_ESC_GLOB_CHARS));
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00005035 if (ch == EOF) {
5036 struct pipe *pi;
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00005037
5038 if (heredoc_cnt) {
Denis Vlasenkod68ae082009-04-09 20:41:34 +00005039 syntax_error_unterm_str("here document");
Denys Vlasenkob1cfc452009-05-02 17:18:34 +02005040 goto parse_error;
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00005041 }
Denys Vlasenkob1cfc452009-05-02 17:18:34 +02005042 if (end_trigger == ')') {
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01005043 syntax_error_unterm_ch('(');
5044 goto parse_error;
Denys Vlasenkob1cfc452009-05-02 17:18:34 +02005045 }
Denys Vlasenko42246472016-11-07 16:22:35 +01005046 if (end_trigger == '}') {
5047 syntax_error_unterm_ch('{');
5048 goto parse_error;
5049 }
Denys Vlasenkob1cfc452009-05-02 17:18:34 +02005050
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005051 if (done_word(&ctx)) {
Denys Vlasenkob1cfc452009-05-02 17:18:34 +02005052 goto parse_error;
Denis Vlasenko55789c62008-06-18 16:30:42 +00005053 }
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005054 o_free(&ctx.word);
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00005055 done_pipe(&ctx, PIPE_SEQ);
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00005056 pi = ctx.list_head;
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00005057 /* If we got nothing... */
Denis Vlasenko0b677d82009-04-10 13:49:10 +00005058 /* (this makes bare "&" cmd a no-op.
5059 * bash says: "syntax error near unexpected token '&'") */
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00005060 if (pi->num_cmds == 0
Denys Vlasenko60cb48c2013-01-14 15:57:44 +01005061 IF_HAS_KEYWORDS(&& pi->res_word == RES_NONE)
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00005062 ) {
Denis Vlasenko0701dca2009-04-11 10:38:47 +00005063 free_pipe_list(pi);
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00005064 pi = NULL;
5065 }
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00005066#if !BB_MMU
Denys Vlasenkob5be13c2015-09-04 06:22:10 +02005067 debug_printf_parse("as_string1 '%s'\n", ctx.as_string.data);
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00005068 if (pstring)
5069 *pstring = ctx.as_string.data;
5070 else
5071 o_free_unsafe(&ctx.as_string);
5072#endif
Denis Vlasenko0701dca2009-04-11 10:38:47 +00005073 debug_leave();
5074 debug_printf_parse("parse_stream return %p\n", pi);
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00005075 return pi;
Denis Vlasenko1a735862007-05-23 00:32:25 +00005076 }
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00005077 nommu_addchr(&ctx.as_string, ch);
Denys Vlasenkod8389ad2009-11-16 03:18:46 +01005078
Denys Vlasenko92a930b2018-04-10 14:20:48 +02005079 if (ch == '\'') {
5080 ctx.word.has_quoted_part = 1;
5081 next = i_getch(input);
5082 if (next == '\'' && !ctx.pending_redirect)
5083 goto insert_empty_quoted_str_marker;
5084
5085 ch = next;
5086 while (1) {
5087 if (ch == EOF) {
5088 syntax_error_unterm_ch('\'');
5089 goto parse_error;
5090 }
5091 nommu_addchr(&ctx.as_string, ch);
5092 if (ch == '\'')
5093 break;
5094 if (ch == SPECIAL_VAR_SYMBOL) {
5095 /* Convert raw ^C to corresponding special variable reference */
5096 o_addchr(&ctx.word, SPECIAL_VAR_SYMBOL);
5097 o_addchr(&ctx.word, SPECIAL_VAR_QUOTED_SVS);
5098 }
5099 o_addqchr(&ctx.word, ch);
5100 ch = i_getch(input);
5101 }
5102 continue; /* get next char */
Denys Vlasenko1e5111b2018-04-01 03:04:55 +02005103 }
Denys Vlasenkod8389ad2009-11-16 03:18:46 +01005104
Denys Vlasenko92a930b2018-04-10 14:20:48 +02005105 next = '\0';
5106 if (ch != '\n' && ch != '\\') {
5107 /* Not on '\': do not break the case of "echo z\\":
5108 * on 2nd '\', i_peek_and_eat_bkslash_nl()
5109 * would stop and try to read next line,
5110 * not letting the command to execute.
5111 */
5112 next = i_peek_and_eat_bkslash_nl(input);
5113 }
5114
5115 is_special = "{}<>;&|()#" /* special outside of "str" */
Denys Vlasenko932b9972018-01-11 12:39:48 +01005116 "\\$\"" IF_HUSH_TICK("`") /* always special */
5117 SPECIAL_VAR_SYMBOL_STR;
Denys Vlasenkod8389ad2009-11-16 03:18:46 +01005118 /* Are { and } special here? */
Denys Vlasenko3227d3f2010-05-17 09:49:47 +02005119 if (ctx.command->argv /* word [word]{... - non-special */
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005120 || ctx.word.length /* word{... - non-special */
5121 || ctx.word.has_quoted_part /* ""{... - non-special */
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02005122 || (next != ';' /* }; - special */
5123 && next != ')' /* }) - special */
Denys Vlasenko672a55e2016-11-04 18:46:14 +01005124 && next != '(' /* {( - special */
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02005125 && next != '&' /* }& and }&& ... - special */
5126 && next != '|' /* }|| ... - special */
5127 && !strchr(defifs, next) /* {word - non-special */
Denys Vlasenko3227d3f2010-05-17 09:49:47 +02005128 )
Denys Vlasenkod8389ad2009-11-16 03:18:46 +01005129 ) {
5130 /* They are not special, skip "{}" */
5131 is_special += 2;
5132 }
5133 is_special = strchr(is_special, ch);
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02005134 is_blank = strchr(defifs, ch);
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00005135
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02005136 if (!is_special && !is_blank) { /* ordinary char */
Denis Vlasenkobf25fbc2009-04-19 13:57:51 +00005137 ordinary_char:
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005138 o_addQchr(&ctx.word, ch);
5139 if ((ctx.is_assignment == MAYBE_ASSIGNMENT
5140 || ctx.is_assignment == WORD_IS_KEYWORD)
Denis Vlasenko55789c62008-06-18 16:30:42 +00005141 && ch == '='
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005142 && is_well_formed_var_name(ctx.word.data, '=')
Denis Vlasenko55789c62008-06-18 16:30:42 +00005143 ) {
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005144 ctx.is_assignment = DEFINITELY_ASSIGNMENT;
5145 debug_printf_parse("ctx.is_assignment='%s'\n", assignment_flag[ctx.is_assignment]);
Denis Vlasenko55789c62008-06-18 16:30:42 +00005146 }
Denis Vlasenkobb81c582007-01-30 22:32:09 +00005147 continue;
5148 }
Denis Vlasenko240c2552009-04-03 03:45:05 +00005149
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02005150 if (is_blank) {
Denys Vlasenko5807e182018-02-08 19:19:04 +01005151#if ENABLE_HUSH_LINENO_VAR
5152/* Case:
5153 * "while ...; do<whitespace><newline>
5154 * cmd ..."
5155 * would think that "cmd" starts in <whitespace> -
5156 * i.e., at the previous line.
5157 * We need to skip all whitespace before newlines.
5158 */
Denys Vlasenkof7869012018-02-08 19:39:42 +01005159 while (ch != '\n') {
5160 next = i_peek(input);
5161 if (next != ' ' && next != '\t' && next != '\n')
5162 break; /* next char is not ws */
5163 ch = i_getch(input);
Denys Vlasenko5807e182018-02-08 19:19:04 +01005164 }
Denys Vlasenkof7869012018-02-08 19:39:42 +01005165 /* ch == last eaten whitespace char */
Denys Vlasenko5807e182018-02-08 19:19:04 +01005166#endif
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005167 if (done_word(&ctx)) {
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005168 goto parse_error;
Eric Andersenaac75e52001-04-30 18:18:45 +00005169 }
Denis Vlasenko37181682009-04-03 03:19:15 +00005170 if (ch == '\n') {
Denys Vlasenko7b4c0fd2010-11-22 17:58:14 +01005171 /* Is this a case when newline is simply ignored?
5172 * Some examples:
5173 * "cmd | <newline> cmd ..."
5174 * "case ... in <newline> word) ..."
5175 */
5176 if (IS_NULL_CMD(ctx.command)
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005177 && ctx.word.length == 0 && !ctx.word.has_quoted_part
Denis Vlasenkof1736072008-07-31 10:09:26 +00005178 ) {
Denys Vlasenko642e71a2011-01-07 15:16:05 +01005179 /* This newline can be ignored. But...
Denys Vlasenko98c46d12011-01-18 17:30:07 +01005180 * Without check #1, interactive shell
5181 * ignores even bare <newline>,
5182 * and shows the continuation prompt:
Denys Vlasenko642e71a2011-01-07 15:16:05 +01005183 * ps1_prompt$ <enter>
Denys Vlasenko98c46d12011-01-18 17:30:07 +01005184 * ps2> _ <=== wrong, should be ps1
5185 * Without check #2, "cmd & <newline>"
5186 * is similarly mistreated.
5187 * (BTW, this makes "cmd & cmd"
5188 * and "cmd && cmd" non-orthogonal.
5189 * Really, ask yourself, why
5190 * "cmd && <newline>" doesn't start
5191 * cmd but waits for more input?
Denys Vlasenkob24e55d2017-07-16 20:29:35 +02005192 * The only reason is that it might be
5193 * a "cmd1 && <nl> cmd2 &" construct,
5194 * cmd1 may need to run in BG).
Denys Vlasenko642e71a2011-01-07 15:16:05 +01005195 */
5196 struct pipe *pi = ctx.list_head;
Denys Vlasenko98c46d12011-01-18 17:30:07 +01005197 if (pi->num_cmds != 0 /* check #1 */
5198 && pi->followup != PIPE_BG /* check #2 */
5199 ) {
Denys Vlasenko642e71a2011-01-07 15:16:05 +01005200 continue;
Denys Vlasenko98c46d12011-01-18 17:30:07 +01005201 }
Denis Vlasenkof1736072008-07-31 10:09:26 +00005202 }
Denis Vlasenko240c2552009-04-03 03:45:05 +00005203 /* Treat newline as a command separator. */
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005204 done_pipe(&ctx, PIPE_SEQ);
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00005205 debug_printf_parse("heredoc_cnt:%d\n", heredoc_cnt);
5206 if (heredoc_cnt) {
Denis Vlasenko3dfb0352009-04-08 09:29:14 +00005207 if (fetch_heredocs(heredoc_cnt, &ctx, input)) {
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00005208 goto parse_error;
Denis Vlasenko3dfb0352009-04-08 09:29:14 +00005209 }
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00005210 heredoc_cnt = 0;
5211 }
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005212 ctx.is_assignment = MAYBE_ASSIGNMENT;
5213 debug_printf_parse("ctx.is_assignment='%s'\n", assignment_flag[ctx.is_assignment]);
Denis Vlasenko240c2552009-04-03 03:45:05 +00005214 ch = ';';
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02005215 /* note: if (is_blank) continue;
Denis Vlasenko240c2552009-04-03 03:45:05 +00005216 * will still trigger for us */
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00005217 }
Denis Vlasenkobb81c582007-01-30 22:32:09 +00005218 }
Denis Vlasenko9f8d9382009-04-19 14:03:11 +00005219
5220 /* "cmd}" or "cmd }..." without semicolon or &:
5221 * } is an ordinary char in this case, even inside { cmd; }
5222 * Pathological example: { ""}; } should exec "}" cmd
5223 */
Denis Vlasenkodcd78c42009-04-19 23:07:51 +00005224 if (ch == '}') {
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005225 if (ctx.word.length != 0 /* word} */
5226 || ctx.word.has_quoted_part /* ""} */
Denis Vlasenkodcd78c42009-04-19 23:07:51 +00005227 ) {
5228 goto ordinary_char;
5229 }
Denys Vlasenko672a55e2016-11-04 18:46:14 +01005230 if (!IS_NULL_CMD(ctx.command)) { /* cmd } */
5231 /* Generally, there should be semicolon: "cmd; }"
5232 * However, bash allows to omit it if "cmd" is
5233 * a group. Examples:
5234 * { { echo 1; } }
5235 * {(echo 1)}
5236 * { echo 0 >&2 | { echo 1; } }
5237 * { while false; do :; done }
5238 * { case a in b) ;; esac }
5239 */
5240 if (ctx.command->group)
5241 goto term_group;
5242 goto ordinary_char;
5243 }
Denis Vlasenkodcd78c42009-04-19 23:07:51 +00005244 if (!IS_NULL_PIPE(ctx.pipe)) /* cmd | } */
Denys Vlasenko672a55e2016-11-04 18:46:14 +01005245 /* Can't be an end of {cmd}, skip the check */
Denis Vlasenkodcd78c42009-04-19 23:07:51 +00005246 goto skip_end_trigger;
5247 /* else: } does terminate a group */
Denis Vlasenko9f8d9382009-04-19 14:03:11 +00005248 }
Denys Vlasenko672a55e2016-11-04 18:46:14 +01005249 term_group:
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00005250 if (end_trigger && end_trigger == ch
Denys Vlasenkoe9bda902009-05-23 16:50:07 +02005251 && (ch != ';' || heredoc_cnt == 0)
5252#if ENABLE_HUSH_CASE
5253 && (ch != ')'
5254 || ctx.ctx_res_w != RES_MATCH
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005255 || (!ctx.word.has_quoted_part && strcmp(ctx.word.data, "esac") == 0)
Denys Vlasenkoe9bda902009-05-23 16:50:07 +02005256 )
5257#endif
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00005258 ) {
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00005259 if (heredoc_cnt) {
5260 /* This is technically valid:
5261 * { cat <<HERE; }; echo Ok
5262 * heredoc
5263 * heredoc
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00005264 * HERE
5265 * but we don't support this.
5266 * We require heredoc to be in enclosing {}/(),
5267 * if any.
5268 */
Denis Vlasenkod68ae082009-04-09 20:41:34 +00005269 syntax_error_unterm_str("here document");
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00005270 goto parse_error;
5271 }
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005272 if (done_word(&ctx)) {
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005273 goto parse_error;
5274 }
5275 done_pipe(&ctx, PIPE_SEQ);
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005276 ctx.is_assignment = MAYBE_ASSIGNMENT;
5277 debug_printf_parse("ctx.is_assignment='%s'\n", assignment_flag[ctx.is_assignment]);
Denis Vlasenko240c2552009-04-03 03:45:05 +00005278 /* Do we sit outside of any if's, loops or case's? */
Denis Vlasenko37181682009-04-03 03:19:15 +00005279 if (!HAS_KEYWORDS
Denys Vlasenko60cb48c2013-01-14 15:57:44 +01005280 IF_HAS_KEYWORDS(|| (ctx.ctx_res_w == RES_NONE && ctx.old_flag == 0))
Denis Vlasenko37181682009-04-03 03:19:15 +00005281 ) {
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005282 o_free(&ctx.word);
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00005283#if !BB_MMU
Denys Vlasenkob5be13c2015-09-04 06:22:10 +02005284 debug_printf_parse("as_string2 '%s'\n", ctx.as_string.data);
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00005285 if (pstring)
5286 *pstring = ctx.as_string.data;
5287 else
5288 o_free_unsafe(&ctx.as_string);
5289#endif
Denys Vlasenko39701202017-08-02 19:44:05 +02005290 if (ch != ';' && IS_NULL_PIPE(ctx.list_head)) {
5291 /* Example: bare "{ }", "()" */
5292 G.last_exitcode = 2; /* bash compat */
5293 syntax_error_unexpected_ch(ch);
5294 goto parse_error2;
5295 }
Denis Vlasenko0701dca2009-04-11 10:38:47 +00005296 debug_printf_parse("parse_stream return %p: "
5297 "end_trigger char found\n",
5298 ctx.list_head);
Denys Vlasenko39701202017-08-02 19:44:05 +02005299 debug_leave();
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005300 return ctx.list_head;
Denis Vlasenkof8d01d32008-06-14 17:13:20 +00005301 }
Denis Vlasenkobb81c582007-01-30 22:32:09 +00005302 }
Denys Vlasenko92a930b2018-04-10 14:20:48 +02005303
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02005304 if (is_blank)
Denis Vlasenkobb81c582007-01-30 22:32:09 +00005305 continue;
Denis Vlasenko55789c62008-06-18 16:30:42 +00005306
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00005307 /* Catch <, > before deciding whether this word is
5308 * an assignment. a=1 2>z b=2: b=2 is still assignment */
5309 switch (ch) {
5310 case '>':
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005311 redir_fd = redirect_opt_num(&ctx.word);
5312 if (done_word(&ctx)) {
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00005313 goto parse_error;
5314 }
5315 redir_style = REDIRECT_OVERWRITE;
5316 if (next == '>') {
5317 redir_style = REDIRECT_APPEND;
5318 ch = i_getch(input);
5319 nommu_addchr(&ctx.as_string, ch);
5320 }
5321#if 0
5322 else if (next == '(') {
5323 syntax_error(">(process) not supported");
5324 goto parse_error;
5325 }
5326#endif
5327 if (parse_redirect(&ctx, redir_fd, redir_style, input))
5328 goto parse_error;
Denys Vlasenko92a930b2018-04-10 14:20:48 +02005329 continue; /* get next char */
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00005330 case '<':
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005331 redir_fd = redirect_opt_num(&ctx.word);
5332 if (done_word(&ctx)) {
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00005333 goto parse_error;
5334 }
5335 redir_style = REDIRECT_INPUT;
5336 if (next == '<') {
5337 redir_style = REDIRECT_HEREDOC;
5338 heredoc_cnt++;
5339 debug_printf_parse("++heredoc_cnt=%d\n", heredoc_cnt);
5340 ch = i_getch(input);
5341 nommu_addchr(&ctx.as_string, ch);
5342 } else if (next == '>') {
5343 redir_style = REDIRECT_IO;
5344 ch = i_getch(input);
5345 nommu_addchr(&ctx.as_string, ch);
5346 }
5347#if 0
5348 else if (next == '(') {
5349 syntax_error("<(process) not supported");
5350 goto parse_error;
5351 }
5352#endif
5353 if (parse_redirect(&ctx, redir_fd, redir_style, input))
5354 goto parse_error;
Denys Vlasenko92a930b2018-04-10 14:20:48 +02005355 continue; /* get next char */
Denys Vlasenko7b4c0fd2010-11-22 17:58:14 +01005356 case '#':
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005357 if (ctx.word.length == 0 && !ctx.word.has_quoted_part) {
Denys Vlasenko7b4c0fd2010-11-22 17:58:14 +01005358 /* skip "#comment" */
Denys Vlasenko25f3b732017-10-22 15:55:48 +02005359 /* note: we do not add it to &ctx.as_string */
5360/* TODO: in bash:
5361 * comment inside $() goes to the next \n, even inside quoted string (!):
5362 * cmd "$(cmd2 #comment)" - syntax error
5363 * cmd "`cmd2 #comment`" - ok
5364 * We accept both (comment ends where command subst ends, in both cases).
5365 */
Denys Vlasenko7b4c0fd2010-11-22 17:58:14 +01005366 while (1) {
5367 ch = i_peek(input);
Denys Vlasenko25f3b732017-10-22 15:55:48 +02005368 if (ch == '\n') {
5369 nommu_addchr(&ctx.as_string, '\n');
Denys Vlasenko7b4c0fd2010-11-22 17:58:14 +01005370 break;
Denys Vlasenko25f3b732017-10-22 15:55:48 +02005371 }
5372 ch = i_getch(input);
5373 if (ch == EOF)
5374 break;
Denys Vlasenko7b4c0fd2010-11-22 17:58:14 +01005375 }
Denys Vlasenko92a930b2018-04-10 14:20:48 +02005376 continue; /* get next char */
Denys Vlasenko7b4c0fd2010-11-22 17:58:14 +01005377 }
5378 break;
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00005379 }
Denys Vlasenko92a930b2018-04-10 14:20:48 +02005380 skip_end_trigger:
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00005381
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005382 if (ctx.is_assignment == MAYBE_ASSIGNMENT
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00005383 /* check that we are not in word in "a=1 2>word b=1": */
5384 && !ctx.pending_redirect
5385 ) {
5386 /* ch is a special char and thus this word
5387 * cannot be an assignment */
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005388 ctx.is_assignment = NOT_ASSIGNMENT;
5389 debug_printf_parse("ctx.is_assignment='%s'\n", assignment_flag[ctx.is_assignment]);
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00005390 }
5391
Denys Vlasenkocbfe6ad2009-08-12 19:47:44 +02005392 /* Note: nommu_addchr(&ctx.as_string, ch) is already done */
5393
Denis Vlasenkobb81c582007-01-30 22:32:09 +00005394 switch (ch) {
Denys Vlasenko932b9972018-01-11 12:39:48 +01005395 case SPECIAL_VAR_SYMBOL:
5396 /* Convert raw ^C to corresponding special variable reference */
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005397 o_addchr(&ctx.word, SPECIAL_VAR_SYMBOL);
5398 o_addchr(&ctx.word, SPECIAL_VAR_QUOTED_SVS);
Denys Vlasenko932b9972018-01-11 12:39:48 +01005399 /* fall through */
5400 case '#':
5401 /* non-comment #: "echo a#b" etc */
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005402 o_addchr(&ctx.word, ch);
Denys Vlasenkoe8b1bc02018-04-10 13:13:10 +02005403 continue; /* get next char */
Eric Andersen25f27032001-04-26 23:22:31 +00005404 case '\\':
Denys Vlasenko92a930b2018-04-10 14:20:48 +02005405 /*nommu_addchr(&ctx.as_string, '\\'); - already done */
Denys Vlasenko89e9d552018-04-11 01:15:33 +02005406 o_addchr(&ctx.word, '\\');
Denys Vlasenko92a930b2018-04-10 14:20:48 +02005407 ch = i_getch(input);
5408 if (ch == EOF) {
Denys Vlasenko89e9d552018-04-11 01:15:33 +02005409 /* Testcase: eval 'echo Ok\' */
5410
5411#if 0 /* bash-4.3.43 was removing backslash, but 4.4.19 retains it, most other shells too */
Denys Vlasenkobcf56112018-04-10 14:40:23 +02005412 /* Remove trailing '\' from ctx.as_string */
5413 ctx.as_string.data[--ctx.as_string.length] = '\0';
5414#endif
5415 continue; /* get next char */
Eric Andersen25f27032001-04-26 23:22:31 +00005416 }
Denys Vlasenko7b4c0fd2010-11-22 17:58:14 +01005417 /* Example: echo Hello \2>file
Denys Vlasenkobcf56112018-04-10 14:40:23 +02005418 * we need to know that word 2 is quoted
5419 */
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005420 ctx.word.has_quoted_part = 1;
Denys Vlasenko92a930b2018-04-10 14:20:48 +02005421 nommu_addchr(&ctx.as_string, ch);
5422 o_addchr(&ctx.word, ch);
Denys Vlasenkoe8b1bc02018-04-10 13:13:10 +02005423 continue; /* get next char */
Eric Andersen25f27032001-04-26 23:22:31 +00005424 case '$':
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005425 if (!parse_dollar(&ctx.as_string, &ctx.word, input, /*quote_mask:*/ 0)) {
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00005426 debug_printf_parse("parse_stream parse error: "
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01005427 "parse_dollar returned 0 (error)\n");
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005428 goto parse_error;
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00005429 }
Denys Vlasenkoe8b1bc02018-04-10 13:13:10 +02005430 continue; /* get next char */
Denys Vlasenkoe8b1bc02018-04-10 13:13:10 +02005431 case '"':
5432 ctx.word.has_quoted_part = 1;
5433 if (next == '"' && !ctx.pending_redirect) {
Denys Vlasenko92a930b2018-04-10 14:20:48 +02005434 i_getch(input); /* eat second " */
Denys Vlasenko6e42b892011-08-01 18:16:43 +02005435 insert_empty_quoted_str_marker:
5436 nommu_addchr(&ctx.as_string, next);
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005437 o_addchr(&ctx.word, SPECIAL_VAR_SYMBOL);
5438 o_addchr(&ctx.word, SPECIAL_VAR_SYMBOL);
Denys Vlasenkoe8b1bc02018-04-10 13:13:10 +02005439 continue; /* get next char */
Eric Andersen25f27032001-04-26 23:22:31 +00005440 }
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005441 if (ctx.is_assignment == NOT_ASSIGNMENT)
5442 ctx.word.o_expflags |= EXP_FLAG_ESC_GLOB_CHARS;
5443 if (!encode_string(&ctx.as_string, &ctx.word, input, '"', /*process_bkslash:*/ 1))
Denys Vlasenko77a7b552010-09-09 12:40:03 +02005444 goto parse_error;
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005445 ctx.word.o_expflags &= ~EXP_FLAG_ESC_GLOB_CHARS;
Denys Vlasenkoe8b1bc02018-04-10 13:13:10 +02005446 continue; /* get next char */
Denis Vlasenko14b5dd92007-05-20 21:51:38 +00005447#if ENABLE_HUSH_TICK
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00005448 case '`': {
Denys Vlasenko60a94142011-05-13 20:57:01 +02005449 USE_FOR_NOMMU(unsigned pos;)
Denys Vlasenko2e48d532010-05-22 17:30:39 +02005450
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005451 o_addchr(&ctx.word, SPECIAL_VAR_SYMBOL);
5452 o_addchr(&ctx.word, '`');
5453 USE_FOR_NOMMU(pos = ctx.word.length;)
5454 if (!add_till_backquote(&ctx.word, input, /*in_dquote:*/ 0))
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01005455 goto parse_error;
Denys Vlasenko2e48d532010-05-22 17:30:39 +02005456# if !BB_MMU
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005457 o_addstr(&ctx.as_string, ctx.word.data + pos);
Denis Vlasenko5c090a92009-04-08 21:51:33 +00005458 o_addchr(&ctx.as_string, '`');
Denys Vlasenko2e48d532010-05-22 17:30:39 +02005459# endif
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005460 o_addchr(&ctx.word, SPECIAL_VAR_SYMBOL);
5461 //debug_printf_subst("SUBST RES3 '%s'\n", ctx.word.data + pos);
Denys Vlasenkoe8b1bc02018-04-10 13:13:10 +02005462 continue; /* get next char */
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00005463 }
Denis Vlasenko14b5dd92007-05-20 21:51:38 +00005464#endif
Eric Andersen25f27032001-04-26 23:22:31 +00005465 case ';':
Denis Vlasenko17f02e72008-07-14 04:32:29 +00005466#if ENABLE_HUSH_CASE
5467 case_semi:
5468#endif
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005469 if (done_word(&ctx)) {
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005470 goto parse_error;
5471 }
5472 done_pipe(&ctx, PIPE_SEQ);
Denis Vlasenko17f02e72008-07-14 04:32:29 +00005473#if ENABLE_HUSH_CASE
5474 /* Eat multiple semicolons, detect
5475 * whether it means something special */
5476 while (1) {
Denys Vlasenko1e5111b2018-04-01 03:04:55 +02005477 ch = i_peek_and_eat_bkslash_nl(input);
Denis Vlasenko17f02e72008-07-14 04:32:29 +00005478 if (ch != ';')
5479 break;
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00005480 ch = i_getch(input);
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00005481 nommu_addchr(&ctx.as_string, ch);
Denys Vlasenkoe9bda902009-05-23 16:50:07 +02005482 if (ctx.ctx_res_w == RES_CASE_BODY) {
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005483 ctx.ctx_dsemicolon = 1;
5484 ctx.ctx_res_w = RES_MATCH;
Denis Vlasenko17f02e72008-07-14 04:32:29 +00005485 break;
5486 }
5487 }
5488#endif
Denis Vlasenko2b576b82008-08-04 00:46:07 +00005489 new_cmd:
5490 /* We just finished a cmd. New one may start
5491 * with an assignment */
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005492 ctx.is_assignment = MAYBE_ASSIGNMENT;
5493 debug_printf_parse("ctx.is_assignment='%s'\n", assignment_flag[ctx.is_assignment]);
Denys Vlasenkoe8b1bc02018-04-10 13:13:10 +02005494 continue; /* get next char */
Eric Andersen25f27032001-04-26 23:22:31 +00005495 case '&':
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005496 if (done_word(&ctx)) {
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005497 goto parse_error;
5498 }
Denis Vlasenkobb81c582007-01-30 22:32:09 +00005499 if (next == '&') {
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00005500 ch = i_getch(input);
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00005501 nommu_addchr(&ctx.as_string, ch);
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005502 done_pipe(&ctx, PIPE_AND);
Eric Andersen25f27032001-04-26 23:22:31 +00005503 } else {
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005504 done_pipe(&ctx, PIPE_BG);
Eric Andersen25f27032001-04-26 23:22:31 +00005505 }
Denis Vlasenko2b576b82008-08-04 00:46:07 +00005506 goto new_cmd;
Eric Andersen25f27032001-04-26 23:22:31 +00005507 case '|':
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005508 if (done_word(&ctx)) {
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005509 goto parse_error;
5510 }
Denis Vlasenkofbeeb322008-07-31 00:17:01 +00005511#if ENABLE_HUSH_CASE
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005512 if (ctx.ctx_res_w == RES_MATCH)
Denis Vlasenkof1736072008-07-31 10:09:26 +00005513 break; /* we are in case's "word | word)" */
Denis Vlasenkofbeeb322008-07-31 00:17:01 +00005514#endif
Denis Vlasenko2b576b82008-08-04 00:46:07 +00005515 if (next == '|') { /* || */
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00005516 ch = i_getch(input);
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00005517 nommu_addchr(&ctx.as_string, ch);
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005518 done_pipe(&ctx, PIPE_OR);
Eric Andersen25f27032001-04-26 23:22:31 +00005519 } else {
5520 /* we could pick up a file descriptor choice here
5521 * with redirect_opt_num(), but bash doesn't do it.
5522 * "echo foo 2| cat" yields "foo 2". */
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005523 done_command(&ctx);
Eric Andersen25f27032001-04-26 23:22:31 +00005524 }
Denis Vlasenko2b576b82008-08-04 00:46:07 +00005525 goto new_cmd;
Eric Andersen25f27032001-04-26 23:22:31 +00005526 case '(':
Denis Vlasenko17f02e72008-07-14 04:32:29 +00005527#if ENABLE_HUSH_CASE
Denis Vlasenkof1736072008-07-31 10:09:26 +00005528 /* "case... in [(]word)..." - skip '(' */
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005529 if (ctx.ctx_res_w == RES_MATCH
5530 && ctx.command->argv == NULL /* not (word|(... */
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005531 && ctx.word.length == 0 /* not word(... */
5532 && ctx.word.has_quoted_part == 0 /* not ""(... */
Denis Vlasenko17f02e72008-07-14 04:32:29 +00005533 ) {
Denys Vlasenkoe8b1bc02018-04-10 13:13:10 +02005534 continue; /* get next char */
Denis Vlasenko17f02e72008-07-14 04:32:29 +00005535 }
5536#endif
Eric Andersen25f27032001-04-26 23:22:31 +00005537 case '{':
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005538 if (parse_group(&ctx, input, ch) != 0) {
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005539 goto parse_error;
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00005540 }
Denis Vlasenko2b576b82008-08-04 00:46:07 +00005541 goto new_cmd;
Eric Andersen25f27032001-04-26 23:22:31 +00005542 case ')':
Denis Vlasenko17f02e72008-07-14 04:32:29 +00005543#if ENABLE_HUSH_CASE
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005544 if (ctx.ctx_res_w == RES_MATCH)
Denis Vlasenko17f02e72008-07-14 04:32:29 +00005545 goto case_semi;
5546#endif
Eric Andersen25f27032001-04-26 23:22:31 +00005547 case '}':
Denis Vlasenkoc3735272008-10-09 12:58:26 +00005548 /* proper use of this character is caught by end_trigger:
5549 * if we see {, we call parse_group(..., end_trigger='}')
5550 * and it will match } earlier (not here). */
Denys Vlasenkob05bcaf2017-01-03 11:47:50 +01005551 G.last_exitcode = 2;
Denys Vlasenko39701202017-08-02 19:44:05 +02005552 syntax_error_unexpected_ch(ch);
Denys Vlasenko9fda6092017-07-14 13:36:48 +02005553 goto parse_error2;
Eric Andersen25f27032001-04-26 23:22:31 +00005554 default:
Denis Vlasenko5ec61322008-06-24 00:50:07 +00005555 if (HUSH_DEBUG)
Denys Vlasenko332e4112018-04-04 22:32:59 +02005556 bb_error_msg_and_die("BUG: unexpected %c", ch);
Eric Andersen25f27032001-04-26 23:22:31 +00005557 }
Denis Vlasenkof8d01d32008-06-14 17:13:20 +00005558 } /* while (1) */
Denis Vlasenko027e3fd2009-04-02 22:50:40 +00005559
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005560 parse_error:
Denys Vlasenkob05bcaf2017-01-03 11:47:50 +01005561 G.last_exitcode = 1;
Denys Vlasenko9fda6092017-07-14 13:36:48 +02005562 parse_error2:
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005563 {
Denis Vlasenko60b392f2009-04-03 19:14:32 +00005564 struct parse_context *pctx;
5565 IF_HAS_KEYWORDS(struct parse_context *p2;)
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005566
5567 /* Clean up allocated tree.
Denys Vlasenko764b2f02009-06-07 16:05:04 +02005568 * Sample for finding leaks on syntax error recovery path.
5569 * Run it from interactive shell, watch pmap `pidof hush`.
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005570 * while if false; then false; fi; do break; fi
Denis Vlasenkocc4c6932009-04-05 07:38:48 +00005571 * Samples to catch leaks at execution:
Denys Vlasenko5d5a6112016-11-07 19:36:50 +01005572 * while if (true | { true;}); then echo ok; fi; do break; done
5573 * while if (true | { true;}); then echo ok; fi; do (if echo ok; break; then :; fi) | cat; break; done
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005574 */
5575 pctx = &ctx;
5576 do {
5577 /* Update pipe/command counts,
5578 * otherwise freeing may miss some */
5579 done_pipe(pctx, PIPE_SEQ);
5580 debug_printf_clean("freeing list %p from ctx %p\n",
5581 pctx->list_head, pctx);
5582 debug_print_tree(pctx->list_head, 0);
Denis Vlasenko0701dca2009-04-11 10:38:47 +00005583 free_pipe_list(pctx->list_head);
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005584 debug_printf_clean("freed list %p\n", pctx->list_head);
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00005585#if !BB_MMU
5586 o_free_unsafe(&pctx->as_string);
5587#endif
Denis Vlasenko60b392f2009-04-03 19:14:32 +00005588 IF_HAS_KEYWORDS(p2 = pctx->stack;)
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005589 if (pctx != &ctx) {
5590 free(pctx);
5591 }
Denis Vlasenko60b392f2009-04-03 19:14:32 +00005592 IF_HAS_KEYWORDS(pctx = p2;)
5593 } while (HAS_KEYWORDS && pctx);
Denys Vlasenkocecbc982011-03-30 18:54:52 +02005594
Denys Vlasenko09b7a7e2018-04-10 03:22:10 +02005595 o_free(&ctx.word);
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00005596#if !BB_MMU
Denys Vlasenkocecbc982011-03-30 18:54:52 +02005597 if (pstring)
5598 *pstring = NULL;
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00005599#endif
Denys Vlasenkocecbc982011-03-30 18:54:52 +02005600 debug_leave();
5601 return ERR_PTR;
Denis Vlasenko027e3fd2009-04-02 22:50:40 +00005602 }
Eric Andersen25f27032001-04-26 23:22:31 +00005603}
5604
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005605
5606/*** Execution routines ***/
5607
5608/* Expansion can recurse, need forward decls: */
Denys Vlasenko637982f2017-07-06 01:52:23 +02005609#if !BASH_PATTERN_SUBST && !ENABLE_HUSH_CASE
Denys Vlasenkod98e5c62010-09-10 10:44:23 +02005610/* only ${var/pattern/repl} (its pattern part) needs additional mode */
5611#define expand_string_to_string(str, do_unbackslash) \
5612 expand_string_to_string(str)
5613#endif
Denys Vlasenkoebee4102010-09-10 10:17:53 +02005614static char *expand_string_to_string(const char *str, int do_unbackslash);
Denys Vlasenko26777aa2010-11-22 23:49:10 +01005615#if ENABLE_HUSH_TICK
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005616static int process_command_subs(o_string *dest, const char *s);
Denys Vlasenko26777aa2010-11-22 23:49:10 +01005617#endif
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005618
5619/* expand_strvec_to_strvec() takes a list of strings, expands
5620 * all variable references within and returns a pointer to
5621 * a list of expanded strings, possibly with larger number
5622 * of strings. (Think VAR="a b"; echo $VAR).
5623 * This new list is allocated as a single malloc block.
5624 * NULL-terminated list of char* pointers is at the beginning of it,
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02005625 * followed by strings themselves.
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005626 * Caller can deallocate entire list by single free(list). */
5627
Denys Vlasenko238081f2010-10-03 14:26:26 +02005628/* A horde of its helpers come first: */
5629
5630static void o_addblock_duplicate_backslash(o_string *o, const char *str, int len)
5631{
5632 while (--len >= 0) {
Denys Vlasenko9e800222010-10-03 14:28:04 +02005633 char c = *str++;
Denys Vlasenko957f79f2010-10-03 17:15:50 +02005634
Denys Vlasenko9e800222010-10-03 14:28:04 +02005635#if ENABLE_HUSH_BRACE_EXPANSION
5636 if (c == '{' || c == '}') {
5637 /* { -> \{, } -> \} */
5638 o_addchr(o, '\\');
Denys Vlasenko957f79f2010-10-03 17:15:50 +02005639 /* And now we want to add { or } and continue:
5640 * o_addchr(o, c);
5641 * continue;
Denys Vlasenko10ad6222017-04-17 16:13:32 +02005642 * luckily, just falling through achieves this.
Denys Vlasenko957f79f2010-10-03 17:15:50 +02005643 */
Denys Vlasenko9e800222010-10-03 14:28:04 +02005644 }
5645#endif
5646 o_addchr(o, c);
5647 if (c == '\\') {
Denys Vlasenko238081f2010-10-03 14:26:26 +02005648 /* \z -> \\\z; \<eol> -> \\<eol> */
5649 o_addchr(o, '\\');
5650 if (len) {
5651 len--;
5652 o_addchr(o, '\\');
5653 o_addchr(o, *str++);
5654 }
5655 }
5656 }
5657}
5658
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005659/* Store given string, finalizing the word and starting new one whenever
5660 * we encounter IFS char(s). This is used for expanding variable values.
Denys Vlasenko6e42b892011-08-01 18:16:43 +02005661 * End-of-string does NOT finalize word: think about 'echo -$VAR-'.
5662 * Return in *ended_with_ifs:
5663 * 1 - ended with IFS char, else 0 (this includes case of empty str).
5664 */
5665static int expand_on_ifs(int *ended_with_ifs, o_string *output, int n, const char *str)
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005666{
Denys Vlasenko6e42b892011-08-01 18:16:43 +02005667 int last_is_ifs = 0;
5668
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005669 while (1) {
Denys Vlasenko4fb53fb2011-08-01 14:06:20 +02005670 int word_len;
5671
5672 if (!*str) /* EOL - do not finalize word */
5673 break;
5674 word_len = strcspn(str, G.ifs);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005675 if (word_len) {
Denys Vlasenko4fb53fb2011-08-01 14:06:20 +02005676 /* We have WORD_LEN leading non-IFS chars */
Denys Vlasenko238081f2010-10-03 14:26:26 +02005677 if (!(output->o_expflags & EXP_FLAG_GLOB)) {
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02005678 o_addblock(output, str, word_len);
Denys Vlasenko238081f2010-10-03 14:26:26 +02005679 } else {
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02005680 /* Protect backslashes against globbing up :)
Denys Vlasenkoa769e022010-09-10 10:12:34 +02005681 * Example: "v='\*'; echo b$v" prints "b\*"
5682 * (and does not try to glob on "*")
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02005683 */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005684 o_addblock_duplicate_backslash(output, str, word_len);
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02005685 /*/ Why can't we do it easier? */
5686 /*o_addblock(output, str, word_len); - WRONG: "v='\*'; echo Z$v" prints "Z*" instead of "Z\*" */
5687 /*o_addqblock(output, str, word_len); - WRONG: "v='*'; echo Z$v" prints "Z*" instead of Z* files */
5688 }
Denys Vlasenko6e42b892011-08-01 18:16:43 +02005689 last_is_ifs = 0;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005690 str += word_len;
Denys Vlasenko4fb53fb2011-08-01 14:06:20 +02005691 if (!*str) /* EOL - do not finalize word */
5692 break;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005693 }
Denys Vlasenko6e42b892011-08-01 18:16:43 +02005694
5695 /* We know str here points to at least one IFS char */
5696 last_is_ifs = 1;
5697 str += strspn(str, G.ifs); /* skip IFS chars */
5698 if (!*str) /* EOL - do not finalize word */
5699 break;
5700
5701 /* Start new word... but not always! */
5702 /* Case "v=' a'; echo ''$v": we do need to finalize empty word: */
Denys Vlasenko4fb53fb2011-08-01 14:06:20 +02005703 if (output->has_quoted_part
5704 /* Case "v=' a'; echo $v":
5705 * here nothing precedes the space in $v expansion,
5706 * therefore we should not finish the word
Denys Vlasenko6e42b892011-08-01 18:16:43 +02005707 * (IOW: if there *is* word to finalize, only then do it):
Denys Vlasenko4fb53fb2011-08-01 14:06:20 +02005708 */
Denys Vlasenko6e42b892011-08-01 18:16:43 +02005709 || (n > 0 && output->data[output->length - 1])
Denys Vlasenko4fb53fb2011-08-01 14:06:20 +02005710 ) {
Denys Vlasenko4fb53fb2011-08-01 14:06:20 +02005711 o_addchr(output, '\0');
5712 debug_print_list("expand_on_ifs", output, n);
5713 n = o_save_ptr(output, n);
5714 }
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005715 }
Denys Vlasenko6e42b892011-08-01 18:16:43 +02005716
5717 if (ended_with_ifs)
5718 *ended_with_ifs = last_is_ifs;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005719 debug_print_list("expand_on_ifs[1]", output, n);
5720 return n;
5721}
5722
5723/* Helper to expand $((...)) and heredoc body. These act as if
5724 * they are in double quotes, with the exception that they are not :).
5725 * Just the rules are similar: "expand only $var and `cmd`"
5726 *
5727 * Returns malloced string.
5728 * As an optimization, we return NULL if expansion is not needed.
5729 */
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01005730#if !BASH_PATTERN_SUBST
Denys Vlasenkod98e5c62010-09-10 10:44:23 +02005731/* only ${var/pattern/repl} (its pattern part) needs additional mode */
5732#define encode_then_expand_string(str, process_bkslash, do_unbackslash) \
5733 encode_then_expand_string(str)
5734#endif
5735static char *encode_then_expand_string(const char *str, int process_bkslash, int do_unbackslash)
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005736{
Denys Vlasenko637982f2017-07-06 01:52:23 +02005737#if !BASH_PATTERN_SUBST
Denys Vlasenko82d1c1f2017-12-31 17:30:02 +01005738 enum { do_unbackslash = 1 };
Denys Vlasenko637982f2017-07-06 01:52:23 +02005739#endif
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005740 char *exp_str;
5741 struct in_str input;
5742 o_string dest = NULL_O_STRING;
5743
5744 if (!strchr(str, '$')
Denys Vlasenko77b32cc2010-09-06 11:27:32 +02005745 && !strchr(str, '\\')
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005746#if ENABLE_HUSH_TICK
5747 && !strchr(str, '`')
5748#endif
5749 ) {
5750 return NULL;
5751 }
5752
5753 /* We need to expand. Example:
5754 * echo $(($a + `echo 1`)) $((1 + $((2)) ))
5755 */
5756 setup_string_in_str(&input, str);
Denys Vlasenkod98e5c62010-09-10 10:44:23 +02005757 encode_string(NULL, &dest, &input, EOF, process_bkslash);
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01005758//TODO: error check (encode_string returns 0 on error)?
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005759 //bb_error_msg("'%s' -> '%s'", str, dest.data);
Denys Vlasenkoebee4102010-09-10 10:17:53 +02005760 exp_str = expand_string_to_string(dest.data, /*unbackslash:*/ do_unbackslash);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005761 //bb_error_msg("'%s' -> '%s'", dest.data, exp_str);
5762 o_free_unsafe(&dest);
5763 return exp_str;
5764}
5765
Denys Vlasenko0b883582016-12-23 16:49:07 +01005766#if ENABLE_FEATURE_SH_MATH
Denys Vlasenko063847d2010-09-15 13:33:02 +02005767static arith_t expand_and_evaluate_arith(const char *arg, const char **errmsg_p)
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005768{
Denys Vlasenko06d44d72010-09-13 12:49:03 +02005769 arith_state_t math_state;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005770 arith_t res;
5771 char *exp_str;
5772
Denys Vlasenko06d44d72010-09-13 12:49:03 +02005773 math_state.lookupvar = get_local_var_value;
5774 math_state.setvar = set_local_var_from_halves;
5775 //math_state.endofname = endofname;
Denys Vlasenkod98e5c62010-09-10 10:44:23 +02005776 exp_str = encode_then_expand_string(arg, /*process_bkslash:*/ 1, /*unbackslash:*/ 1);
Denys Vlasenko06d44d72010-09-13 12:49:03 +02005777 res = arith(&math_state, exp_str ? exp_str : arg);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005778 free(exp_str);
Denys Vlasenko063847d2010-09-15 13:33:02 +02005779 if (errmsg_p)
5780 *errmsg_p = math_state.errmsg;
5781 if (math_state.errmsg)
Denys Vlasenko39701202017-08-02 19:44:05 +02005782 msg_and_die_if_script(math_state.errmsg);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005783 return res;
5784}
5785#endif
5786
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01005787#if BASH_PATTERN_SUBST
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005788/* ${var/[/]pattern[/repl]} helpers */
5789static char *strstr_pattern(char *val, const char *pattern, int *size)
5790{
5791 while (1) {
5792 char *end = scan_and_match(val, pattern, SCAN_MOVE_FROM_RIGHT + SCAN_MATCH_LEFT_HALF);
5793 debug_printf_varexp("val:'%s' pattern:'%s' end:'%s'\n", val, pattern, end);
5794 if (end) {
5795 *size = end - val;
5796 return val;
5797 }
5798 if (*val == '\0')
5799 return NULL;
5800 /* Optimization: if "*pat" did not match the start of "string",
5801 * we know that "tring", "ring" etc will not match too:
5802 */
5803 if (pattern[0] == '*')
5804 return NULL;
5805 val++;
5806 }
5807}
5808static char *replace_pattern(char *val, const char *pattern, const char *repl, char exp_op)
5809{
5810 char *result = NULL;
5811 unsigned res_len = 0;
5812 unsigned repl_len = strlen(repl);
5813
Denys Vlasenkocba79a82018-01-25 14:07:40 +01005814 /* Null pattern never matches, including if "var" is empty */
5815 if (!pattern[0])
5816 return result; /* NULL, no replaces happened */
5817
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005818 while (1) {
5819 int size;
5820 char *s = strstr_pattern(val, pattern, &size);
5821 if (!s)
5822 break;
5823
5824 result = xrealloc(result, res_len + (s - val) + repl_len + 1);
Denys Vlasenko0675b032017-07-24 02:17:05 +02005825 strcpy(mempcpy(result + res_len, val, s - val), repl);
5826 res_len += (s - val) + repl_len;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005827 debug_printf_varexp("val:'%s' s:'%s' result:'%s'\n", val, s, result);
5828
5829 val = s + size;
5830 if (exp_op == '/')
5831 break;
5832 }
Denys Vlasenko0675b032017-07-24 02:17:05 +02005833 if (*val && result) {
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005834 result = xrealloc(result, res_len + strlen(val) + 1);
5835 strcpy(result + res_len, val);
5836 debug_printf_varexp("val:'%s' result:'%s'\n", val, result);
5837 }
5838 debug_printf_varexp("result:'%s'\n", result);
5839 return result;
5840}
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01005841#endif /* BASH_PATTERN_SUBST */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005842
5843/* Helper:
5844 * Handles <SPECIAL_VAR_SYMBOL>varname...<SPECIAL_VAR_SYMBOL> construct.
5845 */
Denys Vlasenkobfc02a72010-09-09 14:38:46 +02005846static NOINLINE const char *expand_one_var(char **to_be_freed_pp, char *arg, char **pp)
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005847{
Denys Vlasenko0ca31982018-01-25 13:20:50 +01005848 const char *val;
5849 char *to_be_freed;
5850 char *p;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005851 char *var;
5852 char first_char;
5853 char exp_op;
5854 char exp_save = exp_save; /* for compiler */
5855 char *exp_saveptr; /* points to expansion operator */
5856 char *exp_word = exp_word; /* for compiler */
Denys Vlasenkobfc02a72010-09-09 14:38:46 +02005857 char arg0;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005858
Denys Vlasenko0ca31982018-01-25 13:20:50 +01005859 val = NULL;
5860 to_be_freed = NULL;
5861 p = *pp;
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02005862 *p = '\0'; /* replace trailing SPECIAL_VAR_SYMBOL */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005863 var = arg;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005864 exp_saveptr = arg[1] ? strchr(VAR_ENCODED_SUBST_OPS, arg[1]) : NULL;
Denys Vlasenkobfc02a72010-09-09 14:38:46 +02005865 arg0 = arg[0];
5866 first_char = arg[0] = arg0 & 0x7f;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005867 exp_op = 0;
5868
Denys Vlasenko2093ad22017-07-26 00:07:27 +02005869 if (first_char == '#' && arg[1] /* ${#...} but not ${#} */
5870 && (!exp_saveptr /* and ( not(${#<op_char>...}) */
5871 || (arg[2] == '\0' && strchr(SPECIAL_VARS_STR, arg[1])) /* or ${#C} "len of $C" ) */
5872 ) /* NB: skipping ^^^specvar check mishandles ${#::2} */
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02005873 ) {
5874 /* It must be length operator: ${#var} */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005875 var++;
5876 exp_op = 'L';
5877 } else {
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02005878 /* Maybe handle parameter expansion */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005879 if (exp_saveptr /* if 2nd char is one of expansion operators */
5880 && strchr(NUMERIC_SPECVARS_STR, first_char) /* 1st char is special variable */
5881 ) {
5882 /* ${?:0}, ${#[:]%0} etc */
5883 exp_saveptr = var + 1;
5884 } else {
5885 /* ${?}, ${var}, ${var:0}, ${var[:]%0} etc */
5886 exp_saveptr = var+1 + strcspn(var+1, VAR_ENCODED_SUBST_OPS);
5887 }
5888 exp_op = exp_save = *exp_saveptr;
5889 if (exp_op) {
5890 exp_word = exp_saveptr + 1;
5891 if (exp_op == ':') {
5892 exp_op = *exp_word++;
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02005893//TODO: try ${var:} and ${var:bogus} in non-bash config
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01005894 if (BASH_SUBSTR
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02005895 && (!exp_op || !strchr(MINUS_PLUS_EQUAL_QUESTION, exp_op))
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005896 ) {
5897 /* oops... it's ${var:N[:M]}, not ${var:?xxx} or some such */
5898 exp_op = ':';
5899 exp_word--;
5900 }
5901 }
5902 *exp_saveptr = '\0';
5903 } /* else: it's not an expansion op, but bare ${var} */
5904 }
5905
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02005906 /* Look up the variable in question */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005907 if (isdigit(var[0])) {
Denys Vlasenko77a7b552010-09-09 12:40:03 +02005908 /* parse_dollar should have vetted var for us */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005909 int n = xatoi_positive(var);
5910 if (n < G.global_argc)
5911 val = G.global_argv[n];
5912 /* else val remains NULL: $N with too big N */
5913 } else {
5914 switch (var[0]) {
5915 case '$': /* pid */
5916 val = utoa(G.root_pid);
5917 break;
5918 case '!': /* bg pid */
5919 val = G.last_bg_pid ? utoa(G.last_bg_pid) : "";
5920 break;
5921 case '?': /* exitcode */
5922 val = utoa(G.last_exitcode);
5923 break;
5924 case '#': /* argc */
5925 val = utoa(G.global_argc ? G.global_argc-1 : 0);
5926 break;
5927 default:
5928 val = get_local_var_value(var);
5929 }
5930 }
5931
5932 /* Handle any expansions */
5933 if (exp_op == 'L') {
Denys Vlasenkoc538d5b2014-08-13 09:57:44 +02005934 reinit_unicode_for_hush();
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005935 debug_printf_expand("expand: length(%s)=", val);
Denys Vlasenkoc538d5b2014-08-13 09:57:44 +02005936 val = utoa(val ? unicode_strlen(val) : 0);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005937 debug_printf_expand("%s\n", val);
5938 } else if (exp_op) {
5939 if (exp_op == '%' || exp_op == '#') {
5940 /* Standard-mandated substring removal ops:
5941 * ${parameter%word} - remove smallest suffix pattern
5942 * ${parameter%%word} - remove largest suffix pattern
5943 * ${parameter#word} - remove smallest prefix pattern
5944 * ${parameter##word} - remove largest prefix pattern
5945 *
5946 * Word is expanded to produce a glob pattern.
5947 * Then var's value is matched to it and matching part removed.
5948 */
5949 if (val && val[0]) {
Denys Vlasenko4f870492010-09-10 11:06:01 +02005950 char *t;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005951 char *exp_exp_word;
5952 char *loc;
5953 unsigned scan_flags = pick_scan(exp_op, *exp_word);
Denys Vlasenkoe4dcba12010-10-28 18:57:19 +02005954 if (exp_op == *exp_word) /* ## or %% */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005955 exp_word++;
Denys Vlasenko55f81332018-03-02 18:12:12 +01005956 debug_printf_expand("expand: exp_word:'%s'\n", exp_word);
Denys Vlasenkod4802c62018-03-02 20:48:36 +01005957 /*
5958 * process_bkslash:1 unbackslash:1 breaks this:
5959 * a='a\\'; echo ${a%\\\\} # correct output is: a
5960 * process_bkslash:1 unbackslash:0 breaks this:
5961 * a='a}'; echo ${a%\}} # correct output is: a
5962 */
5963 exp_exp_word = encode_then_expand_string(exp_word, /*process_bkslash:*/ 0, /*unbackslash:*/ 0);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005964 if (exp_exp_word)
5965 exp_word = exp_exp_word;
Denys Vlasenko55f81332018-03-02 18:12:12 +01005966 debug_printf_expand("expand: exp_exp_word:'%s'\n", exp_word);
Denys Vlasenko4f870492010-09-10 11:06:01 +02005967 /* HACK ALERT. We depend here on the fact that
5968 * G.global_argv and results of utoa and get_local_var_value
5969 * are actually in writable memory:
5970 * scan_and_match momentarily stores NULs there. */
5971 t = (char*)val;
5972 loc = scan_and_match(t, exp_word, scan_flags);
Denys Vlasenko55f81332018-03-02 18:12:12 +01005973 debug_printf_expand("op:%c str:'%s' pat:'%s' res:'%s'\n", exp_op, t, exp_word, loc);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005974 free(exp_exp_word);
5975 if (loc) { /* match was found */
5976 if (scan_flags & SCAN_MATCH_LEFT_HALF) /* #[#] */
Denys Vlasenko4f870492010-09-10 11:06:01 +02005977 val = loc; /* take right part */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005978 else /* %[%] */
Denys Vlasenko4f870492010-09-10 11:06:01 +02005979 val = to_be_freed = xstrndup(val, loc - val); /* left */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005980 }
5981 }
5982 }
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01005983#if BASH_PATTERN_SUBST
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005984 else if (exp_op == '/' || exp_op == '\\') {
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02005985 /* It's ${var/[/]pattern[/repl]} thing.
5986 * Note that in encoded form it has TWO parts:
5987 * var/pattern<SPECIAL_VAR_SYMBOL>repl<SPECIAL_VAR_SYMBOL>
Denys Vlasenko4f870492010-09-10 11:06:01 +02005988 * and if // is used, it is encoded as \:
5989 * var\pattern<SPECIAL_VAR_SYMBOL>repl<SPECIAL_VAR_SYMBOL>
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02005990 */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005991 if (val && val[0]) {
Denys Vlasenko4f870492010-09-10 11:06:01 +02005992 /* pattern uses non-standard expansion.
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02005993 * repl should be unbackslashed and globbed
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02005994 * by the usual expansion rules:
Denys Vlasenkode026252018-04-05 17:04:53 +02005995 * >az >bz
5996 * v='a bz'; echo "${v/a*z/a*z}" #prints "a*z"
5997 * v='a bz'; echo "${v/a*z/\z}" #prints "z"
5998 * v='a bz'; echo ${v/a*z/a*z} #prints "az"
5999 * v='a bz'; echo ${v/a*z/\z} #prints "z"
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02006000 * (note that a*z _pattern_ is never globbed!)
6001 */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006002 char *pattern, *repl, *t;
Denys Vlasenkod98e5c62010-09-10 10:44:23 +02006003 pattern = encode_then_expand_string(exp_word, /*process_bkslash:*/ 0, /*unbackslash:*/ 0);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006004 if (!pattern)
6005 pattern = xstrdup(exp_word);
6006 debug_printf_varexp("pattern:'%s'->'%s'\n", exp_word, pattern);
6007 *p++ = SPECIAL_VAR_SYMBOL;
6008 exp_word = p;
6009 p = strchr(p, SPECIAL_VAR_SYMBOL);
6010 *p = '\0';
Denys Vlasenkode026252018-04-05 17:04:53 +02006011 repl = encode_then_expand_string(exp_word, /*process_bkslash:*/ 0, /*unbackslash:*/ 1);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006012 debug_printf_varexp("repl:'%s'->'%s'\n", exp_word, repl);
6013 /* HACK ALERT. We depend here on the fact that
6014 * G.global_argv and results of utoa and get_local_var_value
6015 * are actually in writable memory:
6016 * replace_pattern momentarily stores NULs there. */
6017 t = (char*)val;
6018 to_be_freed = replace_pattern(t,
6019 pattern,
6020 (repl ? repl : exp_word),
6021 exp_op);
6022 if (to_be_freed) /* at least one replace happened */
6023 val = to_be_freed;
6024 free(pattern);
6025 free(repl);
Denys Vlasenkocba79a82018-01-25 14:07:40 +01006026 } else {
6027 /* Empty variable always gives nothing */
6028 // "v=''; echo ${v/*/w}" prints "", not "w"
6029 /* Just skip "replace" part */
6030 *p++ = SPECIAL_VAR_SYMBOL;
6031 p = strchr(p, SPECIAL_VAR_SYMBOL);
6032 *p = '\0';
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006033 }
6034 }
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01006035#endif /* BASH_PATTERN_SUBST */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006036 else if (exp_op == ':') {
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01006037#if BASH_SUBSTR && ENABLE_FEATURE_SH_MATH
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006038 /* It's ${var:N[:M]} bashism.
6039 * Note that in encoded form it has TWO parts:
6040 * var:N<SPECIAL_VAR_SYMBOL>M<SPECIAL_VAR_SYMBOL>
6041 */
6042 arith_t beg, len;
Denys Vlasenko063847d2010-09-15 13:33:02 +02006043 const char *errmsg;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006044
Denys Vlasenko063847d2010-09-15 13:33:02 +02006045 beg = expand_and_evaluate_arith(exp_word, &errmsg);
6046 if (errmsg)
6047 goto arith_err;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006048 debug_printf_varexp("beg:'%s'=%lld\n", exp_word, (long long)beg);
6049 *p++ = SPECIAL_VAR_SYMBOL;
6050 exp_word = p;
6051 p = strchr(p, SPECIAL_VAR_SYMBOL);
6052 *p = '\0';
Denys Vlasenko063847d2010-09-15 13:33:02 +02006053 len = expand_and_evaluate_arith(exp_word, &errmsg);
6054 if (errmsg)
6055 goto arith_err;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006056 debug_printf_varexp("len:'%s'=%lld\n", exp_word, (long long)len);
Denys Vlasenkoe32b6502017-07-17 16:46:57 +02006057 if (beg < 0) {
6058 /* negative beg counts from the end */
6059 beg = (arith_t)strlen(val) + beg;
6060 if (beg < 0) /* ${v: -999999} is "" */
6061 beg = len = 0;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006062 }
Denys Vlasenkoe32b6502017-07-17 16:46:57 +02006063 debug_printf_varexp("from val:'%s'\n", val);
6064 if (len < 0) {
6065 /* in bash, len=-n means strlen()-n */
6066 len = (arith_t)strlen(val) - beg + len;
6067 if (len < 0) /* bash compat */
Denys Vlasenko39701202017-08-02 19:44:05 +02006068 msg_and_die_if_script("%s: substring expression < 0", var);
Denys Vlasenkoe32b6502017-07-17 16:46:57 +02006069 }
Denys Vlasenko0ba80e42017-07-17 16:50:20 +02006070 if (len <= 0 || !val || beg >= strlen(val)) {
Denys Vlasenkoe32b6502017-07-17 16:46:57 +02006071 arith_err:
6072 val = NULL;
6073 } else {
6074 /* Paranoia. What if user entered 9999999999999
6075 * which fits in arith_t but not int? */
6076 if (len >= INT_MAX)
6077 len = INT_MAX;
6078 val = to_be_freed = xstrndup(val + beg, len);
6079 }
6080 debug_printf_varexp("val:'%s'\n", val);
6081#else /* not (HUSH_SUBSTR_EXPANSION && FEATURE_SH_MATH) */
Denys Vlasenko39701202017-08-02 19:44:05 +02006082 msg_and_die_if_script("malformed ${%s:...}", var);
Denys Vlasenkoe32b6502017-07-17 16:46:57 +02006083 val = NULL;
6084#endif
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006085 } else { /* one of "-=+?" */
6086 /* Standard-mandated substitution ops:
6087 * ${var?word} - indicate error if unset
6088 * If var is unset, word (or a message indicating it is unset
6089 * if word is null) is written to standard error
6090 * and the shell exits with a non-zero exit status.
6091 * Otherwise, the value of var is substituted.
6092 * ${var-word} - use default value
6093 * If var is unset, word is substituted.
6094 * ${var=word} - assign and use default value
6095 * If var is unset, word is assigned to var.
6096 * In all cases, final value of var is substituted.
6097 * ${var+word} - use alternative value
6098 * If var is unset, null is substituted.
6099 * Otherwise, word is substituted.
6100 *
6101 * Word is subjected to tilde expansion, parameter expansion,
6102 * command substitution, and arithmetic expansion.
6103 * If word is not needed, it is not expanded.
6104 *
6105 * Colon forms (${var:-word}, ${var:=word} etc) do the same,
6106 * but also treat null var as if it is unset.
6107 */
6108 int use_word = (!val || ((exp_save == ':') && !val[0]));
6109 if (exp_op == '+')
6110 use_word = !use_word;
6111 debug_printf_expand("expand: op:%c (null:%s) test:%i\n", exp_op,
6112 (exp_save == ':') ? "true" : "false", use_word);
6113 if (use_word) {
Denys Vlasenkod98e5c62010-09-10 10:44:23 +02006114 to_be_freed = encode_then_expand_string(exp_word, /*process_bkslash:*/ 1, /*unbackslash:*/ 1);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006115 if (to_be_freed)
6116 exp_word = to_be_freed;
6117 if (exp_op == '?') {
6118 /* mimic bash message */
Denys Vlasenko39701202017-08-02 19:44:05 +02006119 msg_and_die_if_script("%s: %s",
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006120 var,
Denys Vlasenko645c6972017-07-25 15:18:57 +02006121 exp_word[0]
6122 ? exp_word
6123 : "parameter null or not set"
6124 /* ash has more specific messages, a-la: */
6125 /*: (exp_save == ':' ? "parameter null or not set" : "parameter not set")*/
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006126 );
6127//TODO: how interactive bash aborts expansion mid-command?
6128 } else {
6129 val = exp_word;
6130 }
6131
6132 if (exp_op == '=') {
6133 /* ${var=[word]} or ${var:=[word]} */
6134 if (isdigit(var[0]) || var[0] == '#') {
6135 /* mimic bash message */
Denys Vlasenko39701202017-08-02 19:44:05 +02006136 msg_and_die_if_script("$%s: cannot assign in this way", var);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006137 val = NULL;
6138 } else {
6139 char *new_var = xasprintf("%s=%s", var, val);
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02006140 set_local_var(new_var, /*flag:*/ 0);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006141 }
6142 }
6143 }
6144 } /* one of "-=+?" */
6145
6146 *exp_saveptr = exp_save;
6147 } /* if (exp_op) */
6148
Denys Vlasenkobfc02a72010-09-09 14:38:46 +02006149 arg[0] = arg0;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006150
6151 *pp = p;
6152 *to_be_freed_pp = to_be_freed;
6153 return val;
6154}
6155
6156/* Expand all variable references in given string, adding words to list[]
6157 * at n, n+1,... positions. Return updated n (so that list[n] is next one
6158 * to be filled). This routine is extremely tricky: has to deal with
6159 * variables/parameters with whitespace, $* and $@, and constructs like
6160 * 'echo -$*-'. If you play here, you must run testsuite afterwards! */
Denys Vlasenko95d48f22010-09-08 13:58:55 +02006161static NOINLINE int expand_vars_to_list(o_string *output, int n, char *arg)
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006162{
Denys Vlasenko95d48f22010-09-08 13:58:55 +02006163 /* output->o_expflags & EXP_FLAG_SINGLEWORD (0x80) if we are in
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006164 * expansion of right-hand side of assignment == 1-element expand.
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006165 */
Denys Vlasenkobfc02a72010-09-09 14:38:46 +02006166 char cant_be_null = 0; /* only bit 0x80 matters */
Denys Vlasenko6e42b892011-08-01 18:16:43 +02006167 int ended_in_ifs = 0; /* did last unquoted expansion end with IFS chars? */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006168 char *p;
6169
Denys Vlasenko95d48f22010-09-08 13:58:55 +02006170 debug_printf_expand("expand_vars_to_list: arg:'%s' singleword:%x\n", arg,
6171 !!(output->o_expflags & EXP_FLAG_SINGLEWORD));
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006172 debug_print_list("expand_vars_to_list", output, n);
6173 n = o_save_ptr(output, n);
6174 debug_print_list("expand_vars_to_list[0]", output, n);
6175
6176 while ((p = strchr(arg, SPECIAL_VAR_SYMBOL)) != NULL) {
6177 char first_ch;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006178 char *to_be_freed = NULL;
6179 const char *val = NULL;
6180#if ENABLE_HUSH_TICK
6181 o_string subst_result = NULL_O_STRING;
6182#endif
Denys Vlasenko0b883582016-12-23 16:49:07 +01006183#if ENABLE_FEATURE_SH_MATH
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006184 char arith_buf[sizeof(arith_t)*3 + 2];
6185#endif
Denys Vlasenko6e42b892011-08-01 18:16:43 +02006186
6187 if (ended_in_ifs) {
6188 o_addchr(output, '\0');
6189 n = o_save_ptr(output, n);
6190 ended_in_ifs = 0;
6191 }
6192
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006193 o_addblock(output, arg, p - arg);
6194 debug_print_list("expand_vars_to_list[1]", output, n);
6195 arg = ++p;
6196 p = strchr(p, SPECIAL_VAR_SYMBOL);
6197
Denys Vlasenkobfc02a72010-09-09 14:38:46 +02006198 /* Fetch special var name (if it is indeed one of them)
6199 * and quote bit, force the bit on if singleword expansion -
6200 * important for not getting v=$@ expand to many words. */
Denys Vlasenko95d48f22010-09-08 13:58:55 +02006201 first_ch = arg[0] | (output->o_expflags & EXP_FLAG_SINGLEWORD);
Denys Vlasenkobfc02a72010-09-09 14:38:46 +02006202
6203 /* Is this variable quoted and thus expansion can't be null?
6204 * "$@" is special. Even if quoted, it can still
6205 * expand to nothing (not even an empty string),
6206 * thus it is excluded. */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006207 if ((first_ch & 0x7f) != '@')
Denys Vlasenkobfc02a72010-09-09 14:38:46 +02006208 cant_be_null |= first_ch;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006209
6210 switch (first_ch & 0x7f) {
6211 /* Highest bit in first_ch indicates that var is double-quoted */
6212 case '*':
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02006213 case '@': {
6214 int i;
6215 if (!G.global_argv[1])
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006216 break;
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02006217 i = 1;
Denys Vlasenkobfc02a72010-09-09 14:38:46 +02006218 cant_be_null |= first_ch; /* do it for "$@" _now_, when we know it's not empty */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006219 if (!(first_ch & 0x80)) { /* unquoted $* or $@ */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006220 while (G.global_argv[i]) {
Denys Vlasenko6e42b892011-08-01 18:16:43 +02006221 n = expand_on_ifs(NULL, output, n, G.global_argv[i]);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006222 debug_printf_expand("expand_vars_to_list: argv %d (last %d)\n", i, G.global_argc - 1);
6223 if (G.global_argv[i++][0] && G.global_argv[i]) {
6224 /* this argv[] is not empty and not last:
6225 * put terminating NUL, start new word */
6226 o_addchr(output, '\0');
6227 debug_print_list("expand_vars_to_list[2]", output, n);
6228 n = o_save_ptr(output, n);
6229 debug_print_list("expand_vars_to_list[3]", output, n);
6230 }
6231 }
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006232 } else
Denys Vlasenko95d48f22010-09-08 13:58:55 +02006233 /* If EXP_FLAG_SINGLEWORD, we handle assignment 'a=....$@.....'
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006234 * and in this case should treat it like '$*' - see 'else...' below */
Denys Vlasenko6ffaa002018-03-31 00:46:07 +02006235 if (first_ch == (char)('@'|0x80) /* quoted $@ */
Denys Vlasenkobfc02a72010-09-09 14:38:46 +02006236 && !(output->o_expflags & EXP_FLAG_SINGLEWORD) /* not v="$@" case */
Denys Vlasenko95d48f22010-09-08 13:58:55 +02006237 ) {
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006238 while (1) {
6239 o_addQstr(output, G.global_argv[i]);
6240 if (++i >= G.global_argc)
6241 break;
6242 o_addchr(output, '\0');
6243 debug_print_list("expand_vars_to_list[4]", output, n);
6244 n = o_save_ptr(output, n);
6245 }
Denys Vlasenkobfc02a72010-09-09 14:38:46 +02006246 } else { /* quoted $* (or v="$@" case): add as one word */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006247 while (1) {
6248 o_addQstr(output, G.global_argv[i]);
6249 if (!G.global_argv[++i])
6250 break;
6251 if (G.ifs[0])
6252 o_addchr(output, G.ifs[0]);
6253 }
Denys Vlasenko4fb53fb2011-08-01 14:06:20 +02006254 output->has_quoted_part = 1;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006255 }
6256 break;
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02006257 }
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006258 case SPECIAL_VAR_SYMBOL: /* <SPECIAL_VAR_SYMBOL><SPECIAL_VAR_SYMBOL> */
6259 /* "Empty variable", used to make "" etc to not disappear */
Denys Vlasenko4fb53fb2011-08-01 14:06:20 +02006260 output->has_quoted_part = 1;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006261 arg++;
Denys Vlasenkobfc02a72010-09-09 14:38:46 +02006262 cant_be_null = 0x80;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006263 break;
Denys Vlasenko932b9972018-01-11 12:39:48 +01006264 case SPECIAL_VAR_QUOTED_SVS:
6265 /* <SPECIAL_VAR_SYMBOL><SPECIAL_VAR_QUOTED_SVS><SPECIAL_VAR_SYMBOL> */
6266 arg++;
6267 val = SPECIAL_VAR_SYMBOL_STR;
6268 break;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006269#if ENABLE_HUSH_TICK
6270 case '`': /* <SPECIAL_VAR_SYMBOL>`cmd<SPECIAL_VAR_SYMBOL> */
Denys Vlasenkobfc02a72010-09-09 14:38:46 +02006271 *p = '\0'; /* replace trailing <SPECIAL_VAR_SYMBOL> */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006272 arg++;
6273 /* Can't just stuff it into output o_string,
6274 * expanded result may need to be globbed
Denys Vlasenko10ad6222017-04-17 16:13:32 +02006275 * and $IFS-split */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006276 debug_printf_subst("SUBST '%s' first_ch %x\n", arg, first_ch);
6277 G.last_exitcode = process_command_subs(&subst_result, arg);
Denys Vlasenko5fa05052018-04-03 11:21:13 +02006278 G.expand_exitcode = G.last_exitcode;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006279 debug_printf_subst("SUBST RES:%d '%s'\n", G.last_exitcode, subst_result.data);
6280 val = subst_result.data;
6281 goto store_val;
6282#endif
Denys Vlasenko0b883582016-12-23 16:49:07 +01006283#if ENABLE_FEATURE_SH_MATH
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006284 case '+': { /* <SPECIAL_VAR_SYMBOL>+cmd<SPECIAL_VAR_SYMBOL> */
6285 arith_t res;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006286
6287 arg++; /* skip '+' */
6288 *p = '\0'; /* replace trailing <SPECIAL_VAR_SYMBOL> */
6289 debug_printf_subst("ARITH '%s' first_ch %x\n", arg, first_ch);
Denys Vlasenko063847d2010-09-15 13:33:02 +02006290 res = expand_and_evaluate_arith(arg, NULL);
Denys Vlasenkobed7c812010-09-16 11:50:46 +02006291 debug_printf_subst("ARITH RES '"ARITH_FMT"'\n", res);
6292 sprintf(arith_buf, ARITH_FMT, res);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006293 val = arith_buf;
6294 break;
6295 }
6296#endif
6297 default:
Denys Vlasenkobfc02a72010-09-09 14:38:46 +02006298 val = expand_one_var(&to_be_freed, arg, &p);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006299 IF_HUSH_TICK(store_val:)
6300 if (!(first_ch & 0x80)) { /* unquoted $VAR */
Denys Vlasenko5b686cb2010-09-08 13:44:34 +02006301 debug_printf_expand("unquoted '%s', output->o_escape:%d\n", val,
6302 !!(output->o_expflags & EXP_FLAG_ESC_GLOB_CHARS));
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006303 if (val && val[0]) {
Denys Vlasenko6e42b892011-08-01 18:16:43 +02006304 n = expand_on_ifs(&ended_in_ifs, output, n, val);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006305 val = NULL;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006306 }
6307 } else { /* quoted $VAR, val will be appended below */
Denys Vlasenko4fb53fb2011-08-01 14:06:20 +02006308 output->has_quoted_part = 1;
Denys Vlasenko5b686cb2010-09-08 13:44:34 +02006309 debug_printf_expand("quoted '%s', output->o_escape:%d\n", val,
6310 !!(output->o_expflags & EXP_FLAG_ESC_GLOB_CHARS));
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006311 }
6312 break;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006313 } /* switch (char after <SPECIAL_VAR_SYMBOL>) */
6314
6315 if (val && val[0]) {
6316 o_addQstr(output, val);
6317 }
6318 free(to_be_freed);
Denys Vlasenkobfc02a72010-09-09 14:38:46 +02006319
6320 /* Restore NULL'ed SPECIAL_VAR_SYMBOL.
6321 * Do the check to avoid writing to a const string. */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006322 if (*p != SPECIAL_VAR_SYMBOL)
6323 *p = SPECIAL_VAR_SYMBOL;
6324
6325#if ENABLE_HUSH_TICK
6326 o_free(&subst_result);
6327#endif
6328 arg = ++p;
6329 } /* end of "while (SPECIAL_VAR_SYMBOL is found) ..." */
6330
6331 if (arg[0]) {
Denys Vlasenko6e42b892011-08-01 18:16:43 +02006332 if (ended_in_ifs) {
6333 o_addchr(output, '\0');
6334 n = o_save_ptr(output, n);
6335 }
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006336 debug_print_list("expand_vars_to_list[a]", output, n);
6337 /* this part is literal, and it was already pre-quoted
6338 * if needed (much earlier), do not use o_addQstr here! */
6339 o_addstr_with_NUL(output, arg);
6340 debug_print_list("expand_vars_to_list[b]", output, n);
6341 } else if (output->length == o_get_last_ptr(output, n) /* expansion is empty */
Denys Vlasenkobfc02a72010-09-09 14:38:46 +02006342 && !(cant_be_null & 0x80) /* and all vars were not quoted. */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006343 ) {
6344 n--;
6345 /* allow to reuse list[n] later without re-growth */
6346 output->has_empty_slot = 1;
6347 } else {
6348 o_addchr(output, '\0');
6349 }
6350
6351 return n;
6352}
6353
Denys Vlasenko95d48f22010-09-08 13:58:55 +02006354static char **expand_variables(char **argv, unsigned expflags)
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006355{
6356 int n;
6357 char **list;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006358 o_string output = NULL_O_STRING;
6359
Denys Vlasenko95d48f22010-09-08 13:58:55 +02006360 output.o_expflags = expflags;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006361
6362 n = 0;
Denys Vlasenkoda463fb2010-09-07 09:53:50 +02006363 while (*argv) {
Denys Vlasenko95d48f22010-09-08 13:58:55 +02006364 n = expand_vars_to_list(&output, n, *argv);
Denys Vlasenkoda463fb2010-09-07 09:53:50 +02006365 argv++;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006366 }
6367 debug_print_list("expand_variables", &output, n);
6368
6369 /* output.data (malloced in one block) gets returned in "list" */
6370 list = o_finalize_list(&output, n);
6371 debug_print_strings("expand_variables[1]", list);
6372 return list;
6373}
6374
6375static char **expand_strvec_to_strvec(char **argv)
6376{
Denys Vlasenko5b686cb2010-09-08 13:44:34 +02006377 return expand_variables(argv, EXP_FLAG_GLOB | EXP_FLAG_ESC_GLOB_CHARS);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006378}
6379
Denys Vlasenko11752d42018-04-03 08:20:58 +02006380#if defined(CMD_SINGLEWORD_NOGLOB)
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006381static char **expand_strvec_to_strvec_singleword_noglob(char **argv)
6382{
Denys Vlasenko5b686cb2010-09-08 13:44:34 +02006383 return expand_variables(argv, EXP_FLAG_SINGLEWORD);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006384}
6385#endif
6386
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02006387/* Used for expansion of right hand of assignments,
Denys Vlasenkod358b0b2018-04-05 00:51:55 +02006388 * $((...)), heredocs, variable expansion parts.
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02006389 *
6390 * NB: should NOT do globbing!
6391 * "export v=/bin/c*; env | grep ^v=" outputs "v=/bin/c*"
6392 */
Denys Vlasenkoebee4102010-09-10 10:17:53 +02006393static char *expand_string_to_string(const char *str, int do_unbackslash)
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006394{
Denys Vlasenko637982f2017-07-06 01:52:23 +02006395#if !BASH_PATTERN_SUBST && !ENABLE_HUSH_CASE
Denys Vlasenkod98e5c62010-09-10 10:44:23 +02006396 const int do_unbackslash = 1;
6397#endif
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006398 char *argv[2], **list;
6399
Denys Vlasenkoebee4102010-09-10 10:17:53 +02006400 debug_printf_expand("string_to_string<='%s'\n", str);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006401 /* This is generally an optimization, but it also
6402 * handles "", which otherwise trips over !list[0] check below.
6403 * (is this ever happens that we actually get str="" here?)
6404 */
6405 if (!strchr(str, SPECIAL_VAR_SYMBOL) && !strchr(str, '\\')) {
6406 //TODO: Can use on strings with \ too, just unbackslash() them?
Denys Vlasenkoebee4102010-09-10 10:17:53 +02006407 debug_printf_expand("string_to_string(fast)=>'%s'\n", str);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006408 return xstrdup(str);
6409 }
6410
6411 argv[0] = (char*)str;
6412 argv[1] = NULL;
Denys Vlasenkoebee4102010-09-10 10:17:53 +02006413 list = expand_variables(argv, do_unbackslash
6414 ? EXP_FLAG_ESC_GLOB_CHARS | EXP_FLAG_SINGLEWORD
6415 : EXP_FLAG_SINGLEWORD
6416 );
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006417 if (HUSH_DEBUG)
6418 if (!list[0] || list[1])
6419 bb_error_msg_and_die("BUG in varexp2");
6420 /* actually, just move string 2*sizeof(char*) bytes back */
6421 overlapping_strcpy((char*)list, list[0]);
Denys Vlasenkoebee4102010-09-10 10:17:53 +02006422 if (do_unbackslash)
6423 unbackslash((char*)list);
6424 debug_printf_expand("string_to_string=>'%s'\n", (char*)list);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006425 return (char*)list;
6426}
6427
Denys Vlasenkoabf75562018-04-02 17:25:18 +02006428#if 0
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006429static char* expand_strvec_to_string(char **argv)
6430{
6431 char **list;
6432
Denys Vlasenko5b686cb2010-09-08 13:44:34 +02006433 list = expand_variables(argv, EXP_FLAG_SINGLEWORD);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006434 /* Convert all NULs to spaces */
6435 if (list[0]) {
6436 int n = 1;
6437 while (list[n]) {
6438 if (HUSH_DEBUG)
6439 if (list[n-1] + strlen(list[n-1]) + 1 != list[n])
6440 bb_error_msg_and_die("BUG in varexp3");
6441 /* bash uses ' ' regardless of $IFS contents */
6442 list[n][-1] = ' ';
6443 n++;
6444 }
6445 }
Denys Vlasenko78c9c732016-09-29 01:44:17 +02006446 overlapping_strcpy((char*)list, list[0] ? list[0] : "");
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006447 debug_printf_expand("strvec_to_string='%s'\n", (char*)list);
6448 return (char*)list;
6449}
Denys Vlasenko1f191122018-01-11 13:17:30 +01006450#endif
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006451
6452static char **expand_assignments(char **argv, int count)
6453{
6454 int i;
6455 char **p;
6456
6457 G.expanded_assignments = p = NULL;
6458 /* Expand assignments into one string each */
6459 for (i = 0; i < count; i++) {
Denys Vlasenkoebee4102010-09-10 10:17:53 +02006460 G.expanded_assignments = p = add_string_to_strings(p, expand_string_to_string(argv[i], /*unbackslash:*/ 1));
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006461 }
6462 G.expanded_assignments = NULL;
6463 return p;
6464}
6465
6466
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02006467static void switch_off_special_sigs(unsigned mask)
6468{
6469 unsigned sig = 0;
6470 while ((mask >>= 1) != 0) {
6471 sig++;
6472 if (!(mask & 1))
6473 continue;
Denys Vlasenko7a85c602017-01-08 17:40:18 +01006474#if ENABLE_HUSH_TRAP
6475 if (G_traps) {
6476 if (G_traps[sig] && !G_traps[sig][0])
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02006477 /* trap is '', has to remain SIG_IGN */
6478 continue;
Denys Vlasenko7a85c602017-01-08 17:40:18 +01006479 free(G_traps[sig]);
6480 G_traps[sig] = NULL;
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02006481 }
Denys Vlasenko7a85c602017-01-08 17:40:18 +01006482#endif
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02006483 /* We are here only if no trap or trap was not '' */
Denys Vlasenko0806e402011-05-12 23:06:20 +02006484 install_sighandler(sig, SIG_DFL);
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02006485 }
6486}
6487
Denys Vlasenkob347df92011-08-09 22:49:15 +02006488#if BB_MMU
6489/* never called */
6490void re_execute_shell(char ***to_free, const char *s,
6491 char *g_argv0, char **g_argv,
6492 char **builtin_argv) NORETURN;
6493
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006494static void reset_traps_to_defaults(void)
6495{
6496 /* This function is always called in a child shell
6497 * after fork (not vfork, NOMMU doesn't use this function).
6498 */
Denys Vlasenko7a85c602017-01-08 17:40:18 +01006499 IF_HUSH_TRAP(unsigned sig;)
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006500 unsigned mask;
6501
6502 /* Child shells are not interactive.
6503 * SIGTTIN/SIGTTOU/SIGTSTP should not have special handling.
6504 * Testcase: (while :; do :; done) + ^Z should background.
6505 * Same goes for SIGTERM, SIGHUP, SIGINT.
6506 */
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02006507 mask = (G.special_sig_mask & SPECIAL_INTERACTIVE_SIGS) | G_fatal_sig_mask;
Denys Vlasenko7a85c602017-01-08 17:40:18 +01006508 if (!G_traps && !mask)
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02006509 return; /* already no traps and no special sigs */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006510
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02006511 /* Switch off special sigs */
6512 switch_off_special_sigs(mask);
Denys Vlasenko7a85c602017-01-08 17:40:18 +01006513# if ENABLE_HUSH_JOB
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02006514 G_fatal_sig_mask = 0;
Denys Vlasenko7a85c602017-01-08 17:40:18 +01006515# endif
Denys Vlasenko10c01312011-05-11 11:49:21 +02006516 G.special_sig_mask &= ~SPECIAL_INTERACTIVE_SIGS;
Denys Vlasenkof58f7052011-05-12 02:10:33 +02006517 /* SIGQUIT,SIGCHLD and maybe SPECIAL_JOBSTOP_SIGS
6518 * remain set in G.special_sig_mask */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006519
Denys Vlasenko7a85c602017-01-08 17:40:18 +01006520# if ENABLE_HUSH_TRAP
6521 if (!G_traps)
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02006522 return;
6523
6524 /* Reset all sigs to default except ones with empty traps */
6525 for (sig = 0; sig < NSIG; sig++) {
Denys Vlasenko7a85c602017-01-08 17:40:18 +01006526 if (!G_traps[sig])
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02006527 continue; /* no trap: nothing to do */
Denys Vlasenko7a85c602017-01-08 17:40:18 +01006528 if (!G_traps[sig][0])
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02006529 continue; /* empty trap: has to remain SIG_IGN */
6530 /* sig has non-empty trap, reset it: */
Denys Vlasenko7a85c602017-01-08 17:40:18 +01006531 free(G_traps[sig]);
6532 G_traps[sig] = NULL;
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02006533 /* There is no signal for trap 0 (EXIT) */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006534 if (sig == 0)
6535 continue;
Denys Vlasenko0806e402011-05-12 23:06:20 +02006536 install_sighandler(sig, pick_sighandler(sig));
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006537 }
Denys Vlasenko7a85c602017-01-08 17:40:18 +01006538# endif
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006539}
6540
6541#else /* !BB_MMU */
6542
6543static void re_execute_shell(char ***to_free, const char *s,
6544 char *g_argv0, char **g_argv,
6545 char **builtin_argv) NORETURN;
6546static void re_execute_shell(char ***to_free, const char *s,
6547 char *g_argv0, char **g_argv,
6548 char **builtin_argv)
6549{
6550# define NOMMU_HACK_FMT ("-$%x:%x:%x:%x:%x:%llx" IF_HUSH_LOOPS(":%x"))
6551 /* delims + 2 * (number of bytes in printed hex numbers) */
6552 char param_buf[sizeof(NOMMU_HACK_FMT) + 2 * (sizeof(int)*6 + sizeof(long long)*1)];
6553 char *heredoc_argv[4];
6554 struct variable *cur;
6555# if ENABLE_HUSH_FUNCTIONS
6556 struct function *funcp;
6557# endif
6558 char **argv, **pp;
6559 unsigned cnt;
6560 unsigned long long empty_trap_mask;
6561
6562 if (!g_argv0) { /* heredoc */
6563 argv = heredoc_argv;
6564 argv[0] = (char *) G.argv0_for_re_execing;
6565 argv[1] = (char *) "-<";
6566 argv[2] = (char *) s;
6567 argv[3] = NULL;
6568 pp = &argv[3]; /* used as pointer to empty environment */
6569 goto do_exec;
6570 }
6571
6572 cnt = 0;
6573 pp = builtin_argv;
6574 if (pp) while (*pp++)
6575 cnt++;
6576
6577 empty_trap_mask = 0;
Denys Vlasenko7a85c602017-01-08 17:40:18 +01006578 if (G_traps) {
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006579 int sig;
6580 for (sig = 1; sig < NSIG; sig++) {
Denys Vlasenko7a85c602017-01-08 17:40:18 +01006581 if (G_traps[sig] && !G_traps[sig][0])
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006582 empty_trap_mask |= 1LL << sig;
6583 }
6584 }
6585
6586 sprintf(param_buf, NOMMU_HACK_FMT
6587 , (unsigned) G.root_pid
6588 , (unsigned) G.root_ppid
6589 , (unsigned) G.last_bg_pid
6590 , (unsigned) G.last_exitcode
6591 , cnt
6592 , empty_trap_mask
6593 IF_HUSH_LOOPS(, G.depth_of_loop)
6594 );
6595# undef NOMMU_HACK_FMT
6596 /* 1:hush 2:-$<pid>:<pid>:<exitcode>:<etc...> <vars...> <funcs...>
6597 * 3:-c 4:<cmd> 5:<arg0> <argN...> 6:NULL
6598 */
6599 cnt += 6;
6600 for (cur = G.top_var; cur; cur = cur->next) {
6601 if (!cur->flg_export || cur->flg_read_only)
6602 cnt += 2;
6603 }
6604# if ENABLE_HUSH_FUNCTIONS
6605 for (funcp = G.top_func; funcp; funcp = funcp->next)
6606 cnt += 3;
6607# endif
6608 pp = g_argv;
6609 while (*pp++)
6610 cnt++;
6611 *to_free = argv = pp = xzalloc(sizeof(argv[0]) * cnt);
6612 *pp++ = (char *) G.argv0_for_re_execing;
6613 *pp++ = param_buf;
6614 for (cur = G.top_var; cur; cur = cur->next) {
6615 if (strcmp(cur->varstr, hush_version_str) == 0)
6616 continue;
6617 if (cur->flg_read_only) {
6618 *pp++ = (char *) "-R";
6619 *pp++ = cur->varstr;
6620 } else if (!cur->flg_export) {
6621 *pp++ = (char *) "-V";
6622 *pp++ = cur->varstr;
6623 }
6624 }
6625# if ENABLE_HUSH_FUNCTIONS
6626 for (funcp = G.top_func; funcp; funcp = funcp->next) {
6627 *pp++ = (char *) "-F";
6628 *pp++ = funcp->name;
6629 *pp++ = funcp->body_as_string;
6630 }
6631# endif
6632 /* We can pass activated traps here. Say, -Tnn:trap_string
6633 *
6634 * However, POSIX says that subshells reset signals with traps
6635 * to SIG_DFL.
6636 * I tested bash-3.2 and it not only does that with true subshells
6637 * of the form ( list ), but with any forked children shells.
6638 * I set trap "echo W" WINCH; and then tried:
6639 *
6640 * { echo 1; sleep 20; echo 2; } &
6641 * while true; do echo 1; sleep 20; echo 2; break; done &
6642 * true | { echo 1; sleep 20; echo 2; } | cat
6643 *
6644 * In all these cases sending SIGWINCH to the child shell
6645 * did not run the trap. If I add trap "echo V" WINCH;
6646 * _inside_ group (just before echo 1), it works.
6647 *
6648 * I conclude it means we don't need to pass active traps here.
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006649 */
6650 *pp++ = (char *) "-c";
6651 *pp++ = (char *) s;
6652 if (builtin_argv) {
6653 while (*++builtin_argv)
6654 *pp++ = *builtin_argv;
6655 *pp++ = (char *) "";
6656 }
6657 *pp++ = g_argv0;
6658 while (*g_argv)
6659 *pp++ = *g_argv++;
6660 /* *pp = NULL; - is already there */
6661 pp = environ;
6662
6663 do_exec:
6664 debug_printf_exec("re_execute_shell pid:%d cmd:'%s'\n", getpid(), s);
Denys Vlasenko75e77de2011-05-12 13:12:47 +02006665 /* Don't propagate SIG_IGN to the child */
6666 if (SPECIAL_JOBSTOP_SIGS != 0)
6667 switch_off_special_sigs(G.special_sig_mask & SPECIAL_JOBSTOP_SIGS);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006668 execve(bb_busybox_exec_path, argv, pp);
6669 /* Fallback. Useful for init=/bin/hush usage etc */
6670 if (argv[0][0] == '/')
6671 execve(argv[0], argv, pp);
6672 xfunc_error_retval = 127;
6673 bb_error_msg_and_die("can't re-execute the shell");
6674}
6675#endif /* !BB_MMU */
6676
6677
6678static int run_and_free_list(struct pipe *pi);
6679
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00006680/* Executing from string: eval, sh -c '...'
Denis Vlasenkob6e65562009-04-03 16:49:04 +00006681 * or from file: /etc/profile, . file, sh <script>, sh (intereactive)
6682 * end_trigger controls how often we stop parsing
6683 * NUL: parse all, execute, return
6684 * ';': parse till ';' or newline, execute, repeat till EOF
6685 */
6686static void parse_and_run_stream(struct in_str *inp, int end_trigger)
Eric Andersen25f27032001-04-26 23:22:31 +00006687{
Denys Vlasenko00243b02009-11-16 02:00:03 +01006688 /* Why we need empty flag?
6689 * An obscure corner case "false; ``; echo $?":
6690 * empty command in `` should still set $? to 0.
6691 * But we can't just set $? to 0 at the start,
6692 * this breaks "false; echo `echo $?`" case.
6693 */
6694 bool empty = 1;
Denis Vlasenkob6e65562009-04-03 16:49:04 +00006695 while (1) {
6696 struct pipe *pipe_list;
Denis Vlasenkof8d01d32008-06-14 17:13:20 +00006697
Denys Vlasenkoa1463192011-01-18 17:55:04 +01006698#if ENABLE_HUSH_INTERACTIVE
Denys Vlasenko8d6eab32018-04-07 17:01:31 +02006699 if (end_trigger == ';') {
6700 G.promptmode = 0; /* PS1 */
6701 debug_printf_prompt("%s promptmode=%d\n", __func__, G.promptmode);
6702 }
Denys Vlasenkoa1463192011-01-18 17:55:04 +01006703#endif
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00006704 pipe_list = parse_stream(NULL, inp, end_trigger);
Denys Vlasenkocecbc982011-03-30 18:54:52 +02006705 if (!pipe_list || pipe_list == ERR_PTR) { /* EOF/error */
6706 /* If we are in "big" script
6707 * (not in `cmd` or something similar)...
6708 */
6709 if (pipe_list == ERR_PTR && end_trigger == ';') {
6710 /* Discard cached input (rest of line) */
6711 int ch = inp->last_char;
6712 while (ch != EOF && ch != '\n') {
6713 //bb_error_msg("Discarded:'%c'", ch);
6714 ch = i_getch(inp);
6715 }
6716 /* Force prompt */
6717 inp->p = NULL;
6718 /* This stream isn't empty */
6719 empty = 0;
6720 continue;
6721 }
6722 if (!pipe_list && empty)
Denys Vlasenko00243b02009-11-16 02:00:03 +01006723 G.last_exitcode = 0;
Denis Vlasenkob6e65562009-04-03 16:49:04 +00006724 break;
Denys Vlasenko00243b02009-11-16 02:00:03 +01006725 }
Denis Vlasenkob6e65562009-04-03 16:49:04 +00006726 debug_print_tree(pipe_list, 0);
6727 debug_printf_exec("parse_and_run_stream: run_and_free_list\n");
6728 run_and_free_list(pipe_list);
Denys Vlasenko00243b02009-11-16 02:00:03 +01006729 empty = 0;
Denys Vlasenko04b46bc2016-10-01 22:28:03 +02006730 if (G_flag_return_in_progress == 1)
Denys Vlasenko68d5cb52011-03-24 02:50:03 +01006731 break;
Denis Vlasenkob6e65562009-04-03 16:49:04 +00006732 }
Eric Andersen25f27032001-04-26 23:22:31 +00006733}
6734
Denis Vlasenkob6e65562009-04-03 16:49:04 +00006735static void parse_and_run_string(const char *s)
Eric Andersen25f27032001-04-26 23:22:31 +00006736{
6737 struct in_str input;
Denys Vlasenkoaa617ac2018-02-13 15:30:13 +01006738 //IF_HUSH_LINENO_VAR(unsigned sv = G.lineno;)
6739
Eric Andersen25f27032001-04-26 23:22:31 +00006740 setup_string_in_str(&input, s);
Denis Vlasenkob6e65562009-04-03 16:49:04 +00006741 parse_and_run_stream(&input, '\0');
Denys Vlasenkoaa617ac2018-02-13 15:30:13 +01006742 //IF_HUSH_LINENO_VAR(G.lineno = sv;)
Eric Andersen25f27032001-04-26 23:22:31 +00006743}
6744
Denis Vlasenkob6e65562009-04-03 16:49:04 +00006745static void parse_and_run_file(FILE *f)
Eric Andersen25f27032001-04-26 23:22:31 +00006746{
Eric Andersen25f27032001-04-26 23:22:31 +00006747 struct in_str input;
Denys Vlasenkoaa617ac2018-02-13 15:30:13 +01006748 IF_HUSH_LINENO_VAR(unsigned sv = G.lineno;)
Denys Vlasenko6aad1dd2018-01-19 15:37:04 +01006749
Denys Vlasenkoaa617ac2018-02-13 15:30:13 +01006750 IF_HUSH_LINENO_VAR(G.lineno = 1;)
Denys Vlasenkob8d076b2018-01-19 16:00:57 +01006751 setup_file_in_str(&input, f);
Denis Vlasenkob6e65562009-04-03 16:49:04 +00006752 parse_and_run_stream(&input, ';');
Denys Vlasenkoaa617ac2018-02-13 15:30:13 +01006753 IF_HUSH_LINENO_VAR(G.lineno = sv;)
Eric Andersen25f27032001-04-26 23:22:31 +00006754}
6755
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006756#if ENABLE_HUSH_TICK
6757static FILE *generate_stream_from_string(const char *s, pid_t *pid_p)
6758{
6759 pid_t pid;
6760 int channel[2];
6761# if !BB_MMU
6762 char **to_free = NULL;
6763# endif
6764
6765 xpipe(channel);
6766 pid = BB_MMU ? xfork() : xvfork();
6767 if (pid == 0) { /* child */
6768 disable_restore_tty_pgrp_on_exit();
6769 /* Process substitution is not considered to be usual
6770 * 'command execution'.
6771 * SUSv3 says ctrl-Z should be ignored, ctrl-C should not.
6772 */
6773 bb_signals(0
6774 + (1 << SIGTSTP)
6775 + (1 << SIGTTIN)
6776 + (1 << SIGTTOU)
6777 , SIG_IGN);
6778 CLEAR_RANDOM_T(&G.random_gen); /* or else $RANDOM repeats in child */
6779 close(channel[0]); /* NB: close _first_, then move fd! */
6780 xmove_fd(channel[1], 1);
6781 /* Prevent it from trying to handle ctrl-z etc */
6782 IF_HUSH_JOB(G.run_list_level = 1;)
Denys Vlasenko7a85c602017-01-08 17:40:18 +01006783# if ENABLE_HUSH_TRAP
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006784 /* Awful hack for `trap` or $(trap).
6785 *
6786 * http://www.opengroup.org/onlinepubs/009695399/utilities/trap.html
6787 * contains an example where "trap" is executed in a subshell:
6788 *
6789 * save_traps=$(trap)
6790 * ...
6791 * eval "$save_traps"
6792 *
6793 * Standard does not say that "trap" in subshell shall print
6794 * parent shell's traps. It only says that its output
6795 * must have suitable form, but then, in the above example
6796 * (which is not supposed to be normative), it implies that.
6797 *
6798 * bash (and probably other shell) does implement it
6799 * (traps are reset to defaults, but "trap" still shows them),
6800 * but as a result, "trap" logic is hopelessly messed up:
6801 *
6802 * # trap
6803 * trap -- 'echo Ho' SIGWINCH <--- we have a handler
6804 * # (trap) <--- trap is in subshell - no output (correct, traps are reset)
6805 * # true | trap <--- trap is in subshell - no output (ditto)
6806 * # echo `true | trap` <--- in subshell - output (but traps are reset!)
6807 * trap -- 'echo Ho' SIGWINCH
6808 * # echo `(trap)` <--- in subshell in subshell - output
6809 * trap -- 'echo Ho' SIGWINCH
6810 * # echo `true | (trap)` <--- in subshell in subshell in subshell - output!
6811 * trap -- 'echo Ho' SIGWINCH
6812 *
6813 * The rules when to forget and when to not forget traps
6814 * get really complex and nonsensical.
6815 *
6816 * Our solution: ONLY bare $(trap) or `trap` is special.
6817 */
6818 s = skip_whitespace(s);
Denys Vlasenko8dff01d2015-03-12 17:48:34 +01006819 if (is_prefixed_with(s, "trap")
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006820 && skip_whitespace(s + 4)[0] == '\0'
6821 ) {
6822 static const char *const argv[] = { NULL, NULL };
6823 builtin_trap((char**)argv);
Denys Vlasenkoe9abe752016-08-19 20:15:26 +02006824 fflush_all(); /* important */
6825 _exit(0);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006826 }
Denys Vlasenko7a85c602017-01-08 17:40:18 +01006827# endif
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006828# if BB_MMU
6829 reset_traps_to_defaults();
6830 parse_and_run_string(s);
6831 _exit(G.last_exitcode);
6832# else
6833 /* We re-execute after vfork on NOMMU. This makes this script safe:
6834 * yes "0123456789012345678901234567890" | dd bs=32 count=64k >BIG
6835 * huge=`cat BIG` # was blocking here forever
6836 * echo OK
6837 */
6838 re_execute_shell(&to_free,
6839 s,
6840 G.global_argv[0],
6841 G.global_argv + 1,
6842 NULL);
6843# endif
6844 }
6845
6846 /* parent */
6847 *pid_p = pid;
6848# if ENABLE_HUSH_FAST
6849 G.count_SIGCHLD++;
6850//bb_error_msg("[%d] fork in generate_stream_from_string:"
6851// " G.count_SIGCHLD:%d G.handled_SIGCHLD:%d",
6852// getpid(), G.count_SIGCHLD, G.handled_SIGCHLD);
6853# endif
6854 enable_restore_tty_pgrp_on_exit();
6855# if !BB_MMU
6856 free(to_free);
6857# endif
6858 close(channel[1]);
Denys Vlasenko7b25b1c2016-08-20 15:58:34 +02006859 return remember_FILE(xfdopen_for_read(channel[0]));
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006860}
6861
6862/* Return code is exit status of the process that is run. */
6863static int process_command_subs(o_string *dest, const char *s)
6864{
6865 FILE *fp;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006866 pid_t pid;
6867 int status, ch, eol_cnt;
6868
6869 fp = generate_stream_from_string(s, &pid);
6870
6871 /* Now send results of command back into original context */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006872 eol_cnt = 0;
Denys Vlasenkoaa617ac2018-02-13 15:30:13 +01006873 while ((ch = getc(fp)) != EOF) {
6874 if (ch == '\0')
6875 continue;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006876 if (ch == '\n') {
6877 eol_cnt++;
6878 continue;
6879 }
6880 while (eol_cnt) {
6881 o_addchr(dest, '\n');
6882 eol_cnt--;
6883 }
6884 o_addQchr(dest, ch);
6885 }
6886
6887 debug_printf("done reading from `cmd` pipe, closing it\n");
Denys Vlasenko7b25b1c2016-08-20 15:58:34 +02006888 fclose_and_forget(fp);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006889 /* We need to extract exitcode. Test case
6890 * "true; echo `sleep 1; false` $?"
6891 * should print 1 */
6892 safe_waitpid(pid, &status, 0);
6893 debug_printf("child exited. returning its exitcode:%d\n", WEXITSTATUS(status));
6894 return WEXITSTATUS(status);
6895}
6896#endif /* ENABLE_HUSH_TICK */
6897
6898
6899static void setup_heredoc(struct redir_struct *redir)
6900{
6901 struct fd_pair pair;
6902 pid_t pid;
6903 int len, written;
6904 /* the _body_ of heredoc (misleading field name) */
6905 const char *heredoc = redir->rd_filename;
6906 char *expanded;
6907#if !BB_MMU
6908 char **to_free;
6909#endif
6910
6911 expanded = NULL;
6912 if (!(redir->rd_dup & HEREDOC_QUOTED)) {
Denys Vlasenkod98e5c62010-09-10 10:44:23 +02006913 expanded = encode_then_expand_string(heredoc, /*process_bkslash:*/ 1, /*unbackslash:*/ 1);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006914 if (expanded)
6915 heredoc = expanded;
6916 }
6917 len = strlen(heredoc);
6918
6919 close(redir->rd_fd); /* often saves dup2+close in xmove_fd */
6920 xpiped_pair(pair);
6921 xmove_fd(pair.rd, redir->rd_fd);
6922
6923 /* Try writing without forking. Newer kernels have
6924 * dynamically growing pipes. Must use non-blocking write! */
6925 ndelay_on(pair.wr);
6926 while (1) {
6927 written = write(pair.wr, heredoc, len);
6928 if (written <= 0)
6929 break;
6930 len -= written;
6931 if (len == 0) {
6932 close(pair.wr);
6933 free(expanded);
6934 return;
6935 }
6936 heredoc += written;
6937 }
6938 ndelay_off(pair.wr);
6939
6940 /* Okay, pipe buffer was not big enough */
6941 /* Note: we must not create a stray child (bastard? :)
6942 * for the unsuspecting parent process. Child creates a grandchild
6943 * and exits before parent execs the process which consumes heredoc
6944 * (that exec happens after we return from this function) */
6945#if !BB_MMU
6946 to_free = NULL;
6947#endif
6948 pid = xvfork();
6949 if (pid == 0) {
6950 /* child */
6951 disable_restore_tty_pgrp_on_exit();
6952 pid = BB_MMU ? xfork() : xvfork();
6953 if (pid != 0)
6954 _exit(0);
6955 /* grandchild */
6956 close(redir->rd_fd); /* read side of the pipe */
6957#if BB_MMU
6958 full_write(pair.wr, heredoc, len); /* may loop or block */
6959 _exit(0);
6960#else
6961 /* Delegate blocking writes to another process */
6962 xmove_fd(pair.wr, STDOUT_FILENO);
6963 re_execute_shell(&to_free, heredoc, NULL, NULL, NULL);
6964#endif
6965 }
6966 /* parent */
6967#if ENABLE_HUSH_FAST
6968 G.count_SIGCHLD++;
6969//bb_error_msg("[%d] fork in setup_heredoc: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD);
6970#endif
6971 enable_restore_tty_pgrp_on_exit();
6972#if !BB_MMU
6973 free(to_free);
6974#endif
6975 close(pair.wr);
6976 free(expanded);
6977 wait(NULL); /* wait till child has died */
6978}
6979
Denys Vlasenko2db74612017-07-07 22:07:28 +02006980struct squirrel {
6981 int orig_fd;
6982 int moved_to;
6983 /* moved_to = n: fd was moved to n; restore back to orig_fd after redir */
6984 /* moved_to = -1: fd was opened by redirect; close orig_fd after redir */
6985};
6986
Denys Vlasenko621fc502017-07-24 12:42:17 +02006987static struct squirrel *append_squirrel(struct squirrel *sq, int i, int orig, int moved)
6988{
6989 sq = xrealloc(sq, (i + 2) * sizeof(sq[0]));
6990 sq[i].orig_fd = orig;
6991 sq[i].moved_to = moved;
6992 sq[i+1].orig_fd = -1; /* end marker */
6993 return sq;
6994}
6995
Denys Vlasenko2db74612017-07-07 22:07:28 +02006996static struct squirrel *add_squirrel(struct squirrel *sq, int fd, int avoid_fd)
6997{
Denys Vlasenko621fc502017-07-24 12:42:17 +02006998 int moved_to;
Denys Vlasenko32fdf2f2017-07-31 04:32:06 +02006999 int i;
Denys Vlasenko2db74612017-07-07 22:07:28 +02007000
Denys Vlasenkod16e6122017-08-11 15:41:39 +02007001 i = 0;
7002 if (sq) for (; sq[i].orig_fd >= 0; i++) {
Denys Vlasenko2db74612017-07-07 22:07:28 +02007003 /* If we collide with an already moved fd... */
7004 if (fd == sq[i].moved_to) {
Denys Vlasenko9acd63c2018-03-28 18:35:07 +02007005 sq[i].moved_to = dup_CLOEXEC(sq[i].moved_to, avoid_fd);
Denys Vlasenko2db74612017-07-07 22:07:28 +02007006 debug_printf_redir("redirect_fd %d: already busy, moving to %d\n", fd, sq[i].moved_to);
7007 if (sq[i].moved_to < 0) /* what? */
7008 xfunc_die();
7009 return sq;
7010 }
7011 if (fd == sq[i].orig_fd) {
7012 /* Example: echo Hello >/dev/null 1>&2 */
7013 debug_printf_redir("redirect_fd %d: already moved\n", fd);
7014 return sq;
7015 }
Denys Vlasenko2db74612017-07-07 22:07:28 +02007016 }
7017
Denys Vlasenko2db74612017-07-07 22:07:28 +02007018 /* If this fd is open, we move and remember it; if it's closed, moved_to = -1 */
Denys Vlasenko9acd63c2018-03-28 18:35:07 +02007019 moved_to = dup_CLOEXEC(fd, avoid_fd);
Denys Vlasenko621fc502017-07-24 12:42:17 +02007020 debug_printf_redir("redirect_fd %d: previous fd is moved to %d (-1 if it was closed)\n", fd, moved_to);
7021 if (moved_to < 0 && errno != EBADF)
Denys Vlasenko2db74612017-07-07 22:07:28 +02007022 xfunc_die();
Denys Vlasenko621fc502017-07-24 12:42:17 +02007023 return append_squirrel(sq, i, fd, moved_to);
Denys Vlasenko2db74612017-07-07 22:07:28 +02007024}
7025
Denys Vlasenko657e9002017-07-30 23:34:04 +02007026static struct squirrel *add_squirrel_closed(struct squirrel *sq, int fd)
7027{
7028 int i;
7029
Denys Vlasenkod16e6122017-08-11 15:41:39 +02007030 i = 0;
7031 if (sq) for (; sq[i].orig_fd >= 0; i++) {
Denys Vlasenko657e9002017-07-30 23:34:04 +02007032 /* If we collide with an already moved fd... */
7033 if (fd == sq[i].orig_fd) {
7034 /* Examples:
7035 * "echo 3>FILE 3>&- 3>FILE"
7036 * "echo 3>&- 3>FILE"
7037 * No need for last redirect to insert
7038 * another "need to close 3" indicator.
7039 */
7040 debug_printf_redir("redirect_fd %d: already moved or closed\n", fd);
7041 return sq;
7042 }
Denys Vlasenko657e9002017-07-30 23:34:04 +02007043 }
7044
7045 debug_printf_redir("redirect_fd %d: previous fd was closed\n", fd);
7046 return append_squirrel(sq, i, fd, -1);
7047}
7048
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02007049/* fd: redirect wants this fd to be used (e.g. 3>file).
7050 * Move all conflicting internally used fds,
7051 * and remember them so that we can restore them later.
7052 */
Denys Vlasenko657e9002017-07-30 23:34:04 +02007053static int save_fd_on_redirect(int fd, int avoid_fd, struct squirrel **sqp)
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02007054{
Denys Vlasenko2db74612017-07-07 22:07:28 +02007055 if (avoid_fd < 9) /* the important case here is that it can be -1 */
7056 avoid_fd = 9;
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02007057
7058#if ENABLE_HUSH_INTERACTIVE
Denys Vlasenko32fdf2f2017-07-31 04:32:06 +02007059 if (fd == G.interactive_fd) {
7060 /* Testcase: "ls -l /proc/$$/fd 255>&-" should work */
Denys Vlasenko657e9002017-07-30 23:34:04 +02007061 G.interactive_fd = xdup_CLOEXEC_and_close(G.interactive_fd, avoid_fd);
Denys Vlasenko2db74612017-07-07 22:07:28 +02007062 debug_printf_redir("redirect_fd %d: matches interactive_fd, moving it to %d\n", fd, G.interactive_fd);
7063 return 1; /* "we closed fd" */
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02007064 }
7065#endif
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02007066 /* Are we called from setup_redirects(squirrel==NULL)? Two cases:
7067 * (1) Redirect in a forked child. No need to save FILEs' fds,
7068 * we aren't going to use them anymore, ok to trash.
Denys Vlasenko2db74612017-07-07 22:07:28 +02007069 * (2) "exec 3>FILE". Bummer. We can save script FILEs' fds,
7070 * but how are we doing to restore them?
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02007071 * "fileno(fd) = new_fd" can't be done.
7072 */
Denys Vlasenko2db74612017-07-07 22:07:28 +02007073 if (!sqp)
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02007074 return 0;
7075
Denys Vlasenko2db74612017-07-07 22:07:28 +02007076 /* If this one of script's fds? */
7077 if (save_FILEs_on_redirect(fd, avoid_fd))
7078 return 1; /* yes. "we closed fd" */
7079
7080 /* Check whether it collides with any open fds (e.g. stdio), save fds as needed */
7081 *sqp = add_squirrel(*sqp, fd, avoid_fd);
7082 return 0; /* "we did not close fd" */
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02007083}
7084
Denys Vlasenko2db74612017-07-07 22:07:28 +02007085static void restore_redirects(struct squirrel *sq)
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02007086{
Denys Vlasenko2db74612017-07-07 22:07:28 +02007087 if (sq) {
Denys Vlasenko32fdf2f2017-07-31 04:32:06 +02007088 int i;
7089 for (i = 0; sq[i].orig_fd >= 0; i++) {
Denys Vlasenko2db74612017-07-07 22:07:28 +02007090 if (sq[i].moved_to >= 0) {
7091 /* We simply die on error */
7092 debug_printf_redir("restoring redirected fd from %d to %d\n", sq[i].moved_to, sq[i].orig_fd);
7093 xmove_fd(sq[i].moved_to, sq[i].orig_fd);
7094 } else {
7095 /* cmd1 9>FILE; cmd2_should_see_fd9_closed */
7096 debug_printf_redir("restoring redirected fd %d: closing it\n", sq[i].orig_fd);
7097 close(sq[i].orig_fd);
7098 }
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02007099 }
Denys Vlasenko2db74612017-07-07 22:07:28 +02007100 free(sq);
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02007101 }
7102
Denys Vlasenko2db74612017-07-07 22:07:28 +02007103 /* If moved, G.interactive_fd stays on new fd, not restoring it */
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02007104
7105 restore_redirected_FILEs();
7106}
7107
Denys Vlasenkobf1c3442017-07-31 04:54:53 +02007108#if ENABLE_FEATURE_SH_STANDALONE && BB_MMU
Denys Vlasenko5b3d2eb2017-07-31 18:02:28 +02007109static void close_saved_fds_and_FILE_fds(void)
Denys Vlasenkobf1c3442017-07-31 04:54:53 +02007110{
7111 if (G_interactive_fd)
7112 close(G_interactive_fd);
7113 close_all_FILE_list();
7114}
7115#endif
7116
Denys Vlasenko32fdf2f2017-07-31 04:32:06 +02007117static int internally_opened_fd(int fd, struct squirrel *sq)
7118{
7119 int i;
7120
7121#if ENABLE_HUSH_INTERACTIVE
7122 if (fd == G.interactive_fd)
7123 return 1;
7124#endif
7125 /* If this one of script's fds? */
7126 if (fd_in_FILEs(fd))
7127 return 1;
7128
7129 if (sq) for (i = 0; sq[i].orig_fd >= 0; i++) {
7130 if (fd == sq[i].moved_to)
7131 return 1;
7132 }
7133 return 0;
7134}
7135
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007136/* squirrel != NULL means we squirrel away copies of stdin, stdout,
7137 * and stderr if they are redirected. */
Denys Vlasenko2db74612017-07-07 22:07:28 +02007138static int setup_redirects(struct command *prog, struct squirrel **sqp)
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007139{
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007140 struct redir_struct *redir;
7141
7142 for (redir = prog->redirects; redir; redir = redir->next) {
Denys Vlasenko657e9002017-07-30 23:34:04 +02007143 int newfd;
7144 int closed;
7145
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007146 if (redir->rd_type == REDIRECT_HEREDOC2) {
Denys Vlasenko869994c2016-08-20 15:16:00 +02007147 /* "rd_fd<<HERE" case */
Denys Vlasenko657e9002017-07-30 23:34:04 +02007148 save_fd_on_redirect(redir->rd_fd, /*avoid:*/ 0, sqp);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007149 /* for REDIRECT_HEREDOC2, rd_filename holds _contents_
7150 * of the heredoc */
7151 debug_printf_parse("set heredoc '%s'\n",
7152 redir->rd_filename);
7153 setup_heredoc(redir);
7154 continue;
7155 }
7156
7157 if (redir->rd_dup == REDIRFD_TO_FILE) {
Denys Vlasenko869994c2016-08-20 15:16:00 +02007158 /* "rd_fd<*>file" case (<*> is <,>,>>,<>) */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007159 char *p;
Denys Vlasenko657e9002017-07-30 23:34:04 +02007160 int mode;
7161
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007162 if (redir->rd_filename == NULL) {
Denys Vlasenkod6a37d82016-09-20 16:22:24 +02007163 /*
7164 * Examples:
7165 * "cmd >" (no filename)
7166 * "cmd > <file" (2nd redirect starts too early)
7167 */
Denys Vlasenko39701202017-08-02 19:44:05 +02007168 syntax_error("invalid redirect");
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007169 continue;
7170 }
7171 mode = redir_table[redir->rd_type].mode;
Denys Vlasenkoebee4102010-09-10 10:17:53 +02007172 p = expand_string_to_string(redir->rd_filename, /*unbackslash:*/ 1);
Denys Vlasenko657e9002017-07-30 23:34:04 +02007173 newfd = open_or_warn(p, mode);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007174 free(p);
Denys Vlasenko657e9002017-07-30 23:34:04 +02007175 if (newfd < 0) {
Denys Vlasenko869994c2016-08-20 15:16:00 +02007176 /* Error message from open_or_warn can be lost
7177 * if stderr has been redirected, but bash
7178 * and ash both lose it as well
7179 * (though zsh doesn't!)
7180 */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007181 return 1;
7182 }
Denys Vlasenko657e9002017-07-30 23:34:04 +02007183 if (newfd == redir->rd_fd && sqp) {
Denys Vlasenko621fc502017-07-24 12:42:17 +02007184 /* open() gave us precisely the fd we wanted.
7185 * This means that this fd was not busy
7186 * (not opened to anywhere).
7187 * Remember to close it on restore:
7188 */
Denys Vlasenko657e9002017-07-30 23:34:04 +02007189 *sqp = add_squirrel_closed(*sqp, newfd);
7190 debug_printf_redir("redir to previously closed fd %d\n", newfd);
Denys Vlasenko621fc502017-07-24 12:42:17 +02007191 }
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007192 } else {
Denys Vlasenko657e9002017-07-30 23:34:04 +02007193 /* "rd_fd>&rd_dup" or "rd_fd>&-" case */
7194 newfd = redir->rd_dup;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007195 }
7196
Denys Vlasenko657e9002017-07-30 23:34:04 +02007197 if (newfd == redir->rd_fd)
7198 continue;
7199
7200 /* if "N>FILE": move newfd to redir->rd_fd */
7201 /* if "N>&M": dup newfd to redir->rd_fd */
7202 /* if "N>&-": close redir->rd_fd (newfd is REDIRFD_CLOSE) */
7203
7204 closed = save_fd_on_redirect(redir->rd_fd, /*avoid:*/ newfd, sqp);
7205 if (newfd == REDIRFD_CLOSE) {
7206 /* "N>&-" means "close me" */
7207 if (!closed) {
7208 /* ^^^ optimization: saving may already
7209 * have closed it. If not... */
7210 close(redir->rd_fd);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007211 }
Denys Vlasenko657e9002017-07-30 23:34:04 +02007212 /* Sometimes we do another close on restore, getting EBADF.
7213 * Consider "echo 3>FILE 3>&-"
7214 * first redirect remembers "need to close 3",
7215 * and second redirect closes 3! Restore code then closes 3 again.
7216 */
7217 } else {
Denys Vlasenko32fdf2f2017-07-31 04:32:06 +02007218 /* if newfd is a script fd or saved fd, simulate EBADF */
7219 if (internally_opened_fd(newfd, sqp ? *sqp : NULL)) {
7220 //errno = EBADF;
7221 //bb_perror_msg_and_die("can't duplicate file descriptor");
7222 newfd = -1; /* same effect as code above */
7223 }
Denys Vlasenko657e9002017-07-30 23:34:04 +02007224 xdup2(newfd, redir->rd_fd);
7225 if (redir->rd_dup == REDIRFD_TO_FILE)
7226 /* "rd_fd > FILE" */
7227 close(newfd);
7228 /* else: "rd_fd > rd_dup" */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007229 }
7230 }
7231 return 0;
7232}
7233
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007234static char *find_in_path(const char *arg)
7235{
7236 char *ret = NULL;
7237 const char *PATH = get_local_var_value("PATH");
7238
7239 if (!PATH)
7240 return NULL;
7241
7242 while (1) {
7243 const char *end = strchrnul(PATH, ':');
7244 int sz = end - PATH; /* must be int! */
7245
7246 free(ret);
7247 if (sz != 0) {
7248 ret = xasprintf("%.*s/%s", sz, PATH, arg);
7249 } else {
7250 /* We have xxx::yyyy in $PATH,
7251 * it means "use current dir" */
7252 ret = xstrdup(arg);
7253 }
7254 if (access(ret, F_OK) == 0)
7255 break;
7256
7257 if (*end == '\0') {
7258 free(ret);
7259 return NULL;
7260 }
7261 PATH = end + 1;
7262 }
7263
7264 return ret;
7265}
7266
Denys Vlasenkoda463fb2010-09-07 09:53:50 +02007267static const struct built_in_command *find_builtin_helper(const char *name,
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007268 const struct built_in_command *x,
7269 const struct built_in_command *end)
7270{
7271 while (x != end) {
7272 if (strcmp(name, x->b_cmd) != 0) {
7273 x++;
7274 continue;
7275 }
7276 debug_printf_exec("found builtin '%s'\n", name);
7277 return x;
7278 }
7279 return NULL;
7280}
Denys Vlasenkoda463fb2010-09-07 09:53:50 +02007281static const struct built_in_command *find_builtin1(const char *name)
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007282{
7283 return find_builtin_helper(name, bltins1, &bltins1[ARRAY_SIZE(bltins1)]);
7284}
Denys Vlasenkoda463fb2010-09-07 09:53:50 +02007285static const struct built_in_command *find_builtin(const char *name)
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007286{
7287 const struct built_in_command *x = find_builtin1(name);
7288 if (x)
7289 return x;
7290 return find_builtin_helper(name, bltins2, &bltins2[ARRAY_SIZE(bltins2)]);
7291}
7292
7293#if ENABLE_HUSH_FUNCTIONS
7294static struct function **find_function_slot(const char *name)
7295{
Denys Vlasenko33f7c8f2018-03-06 17:21:57 +01007296 struct function *funcp;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007297 struct function **funcpp = &G.top_func;
Denys Vlasenko33f7c8f2018-03-06 17:21:57 +01007298
7299 while ((funcp = *funcpp) != NULL) {
7300 if (strcmp(name, funcp->name) == 0) {
7301 debug_printf_exec("found function '%s'\n", name);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007302 break;
7303 }
Denys Vlasenko33f7c8f2018-03-06 17:21:57 +01007304 funcpp = &funcp->next;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007305 }
7306 return funcpp;
7307}
7308
Denys Vlasenko33f7c8f2018-03-06 17:21:57 +01007309static ALWAYS_INLINE const struct function *find_function(const char *name)
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007310{
7311 const struct function *funcp = *find_function_slot(name);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007312 return funcp;
7313}
7314
7315/* Note: takes ownership on name ptr */
7316static struct function *new_function(char *name)
7317{
7318 struct function **funcpp = find_function_slot(name);
7319 struct function *funcp = *funcpp;
7320
7321 if (funcp != NULL) {
7322 struct command *cmd = funcp->parent_cmd;
7323 debug_printf_exec("func %p parent_cmd %p\n", funcp, cmd);
7324 if (!cmd) {
7325 debug_printf_exec("freeing & replacing function '%s'\n", funcp->name);
7326 free(funcp->name);
7327 /* Note: if !funcp->body, do not free body_as_string!
7328 * This is a special case of "-F name body" function:
7329 * body_as_string was not malloced! */
7330 if (funcp->body) {
7331 free_pipe_list(funcp->body);
7332# if !BB_MMU
7333 free(funcp->body_as_string);
7334# endif
7335 }
7336 } else {
7337 debug_printf_exec("reinserting in tree & replacing function '%s'\n", funcp->name);
7338 cmd->argv[0] = funcp->name;
7339 cmd->group = funcp->body;
7340# if !BB_MMU
7341 cmd->group_as_string = funcp->body_as_string;
7342# endif
7343 }
7344 } else {
7345 debug_printf_exec("remembering new function '%s'\n", name);
7346 funcp = *funcpp = xzalloc(sizeof(*funcp));
7347 /*funcp->next = NULL;*/
7348 }
7349
7350 funcp->name = name;
7351 return funcp;
7352}
7353
Denys Vlasenko10d5ece2017-01-08 18:28:43 +01007354# if ENABLE_HUSH_UNSET
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007355static void unset_func(const char *name)
7356{
7357 struct function **funcpp = find_function_slot(name);
7358 struct function *funcp = *funcpp;
7359
7360 if (funcp != NULL) {
7361 debug_printf_exec("freeing function '%s'\n", funcp->name);
7362 *funcpp = funcp->next;
7363 /* funcp is unlinked now, deleting it.
7364 * Note: if !funcp->body, the function was created by
7365 * "-F name body", do not free ->body_as_string
7366 * and ->name as they were not malloced. */
7367 if (funcp->body) {
7368 free_pipe_list(funcp->body);
7369 free(funcp->name);
Denys Vlasenko10d5ece2017-01-08 18:28:43 +01007370# if !BB_MMU
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007371 free(funcp->body_as_string);
Denys Vlasenko10d5ece2017-01-08 18:28:43 +01007372# endif
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007373 }
7374 free(funcp);
7375 }
7376}
Denys Vlasenko10d5ece2017-01-08 18:28:43 +01007377# endif
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007378
Denys Vlasenko9db344a2018-04-09 19:05:11 +02007379static void remove_nested_vars(void)
7380{
7381 struct variable *cur;
7382 struct variable **cur_pp;
7383
7384 cur_pp = &G.top_var;
7385 while ((cur = *cur_pp) != NULL) {
7386 if (cur->var_nest_level <= G.var_nest_level) {
7387 cur_pp = &cur->next;
7388 continue;
7389 }
7390 /* Unexport */
7391 if (cur->flg_export) {
7392 debug_printf_env("unexporting nested '%s'/%u\n", cur->varstr, cur->var_nest_level);
7393 bb_unsetenv(cur->varstr);
7394 }
7395 /* Remove from global list */
7396 *cur_pp = cur->next;
7397 /* Free */
7398 if (!cur->max_len) {
7399 debug_printf_env("freeing nested '%s'/%u\n", cur->varstr, cur->var_nest_level);
7400 free(cur->varstr);
7401 }
7402 free(cur);
7403 }
7404}
7405
7406static void enter_var_nest_level(void)
7407{
7408 G.var_nest_level++;
7409 debug_printf_env("var_nest_level++ %u\n", G.var_nest_level);
7410
7411 /* Try: f() { echo -n .; f; }; f
7412 * struct variable::var_nest_level is uint16_t,
7413 * thus limiting recursion to < 2^16.
7414 * In any case, with 8 Mbyte stack SEGV happens
7415 * not too long after 2^16 recursions anyway.
7416 */
7417 if (G.var_nest_level > 0xff00)
7418 bb_error_msg_and_die("fatal recursion (depth %u)", G.var_nest_level);
7419}
7420
7421static void leave_var_nest_level(void)
7422{
7423 G.var_nest_level--;
7424 debug_printf_env("var_nest_level-- %u\n", G.var_nest_level);
7425 if (HUSH_DEBUG && (int)G.var_nest_level < 0)
7426 bb_error_msg_and_die("BUG: nesting underflow");
7427
7428 remove_nested_vars();
7429}
7430
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007431# if BB_MMU
7432#define exec_function(to_free, funcp, argv) \
7433 exec_function(funcp, argv)
7434# endif
7435static void exec_function(char ***to_free,
7436 const struct function *funcp,
7437 char **argv) NORETURN;
7438static void exec_function(char ***to_free,
7439 const struct function *funcp,
7440 char **argv)
7441{
7442# if BB_MMU
Denys Vlasenkod4e4fdb2017-07-03 21:31:16 +02007443 int n;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007444
7445 argv[0] = G.global_argv[0];
7446 G.global_argv = argv;
Denys Vlasenkod4e4fdb2017-07-03 21:31:16 +02007447 G.global_argc = n = 1 + string_array_len(argv + 1);
Denys Vlasenko5b3d2eb2017-07-31 18:02:28 +02007448
7449// Example when we are here: "cmd | func"
7450// func will run with saved-redirect fds open.
7451// $ f() { echo /proc/self/fd/*; }
7452// $ true | f
7453// /proc/self/fd/0 /proc/self/fd/1 /proc/self/fd/2 /proc/self/fd/255 /proc/self/fd/3
7454// stdio^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ G_interactive_fd^ DIR fd for glob
7455// Same in script:
7456// $ . ./SCRIPT
7457// /proc/self/fd/0 /proc/self/fd/1 /proc/self/fd/2 /proc/self/fd/255 /proc/self/fd/3 /proc/self/fd/4
7458// stdio^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ G_interactive_fd^ opened ./SCRIPT DIR fd for glob
7459// They are CLOEXEC so external programs won't see them, but
7460// for "more correctness" we might want to close those extra fds here:
7461//? close_saved_fds_and_FILE_fds();
7462
Denys Vlasenko332e4112018-04-04 22:32:59 +02007463 /* "we are in a function, ok to use return" */
Denys Vlasenko5b3d2eb2017-07-31 18:02:28 +02007464 G_flag_return_in_progress = -1;
Denys Vlasenko9db344a2018-04-09 19:05:11 +02007465 enter_var_nest_level();
Denys Vlasenko5b3d2eb2017-07-31 18:02:28 +02007466 IF_HUSH_LOCAL(G.func_nest_level++;)
7467
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007468 /* On MMU, funcp->body is always non-NULL */
7469 n = run_list(funcp->body);
7470 fflush_all();
7471 _exit(n);
7472# else
Denys Vlasenko5b3d2eb2017-07-31 18:02:28 +02007473//? close_saved_fds_and_FILE_fds();
7474
7475//TODO: check whether "true | func_with_return" works
7476
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007477 re_execute_shell(to_free,
7478 funcp->body_as_string,
7479 G.global_argv[0],
7480 argv + 1,
7481 NULL);
7482# endif
7483}
7484
7485static int run_function(const struct function *funcp, char **argv)
7486{
7487 int rc;
7488 save_arg_t sv;
7489 smallint sv_flg;
7490
7491 save_and_replace_G_args(&sv, argv);
7492
Denys Vlasenkod358b0b2018-04-05 00:51:55 +02007493 /* "We are in function, ok to use return" */
Denys Vlasenko04b46bc2016-10-01 22:28:03 +02007494 sv_flg = G_flag_return_in_progress;
7495 G_flag_return_in_progress = -1;
Denys Vlasenko332e4112018-04-04 22:32:59 +02007496
Denys Vlasenkod358b0b2018-04-05 00:51:55 +02007497 /* Make "local" variables properly shadow previous ones */
7498 IF_HUSH_LOCAL(enter_var_nest_level();)
Denys Vlasenko5b3d2eb2017-07-31 18:02:28 +02007499 IF_HUSH_LOCAL(G.func_nest_level++;)
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007500
7501 /* On MMU, funcp->body is always non-NULL */
7502# if !BB_MMU
7503 if (!funcp->body) {
7504 /* Function defined by -F */
7505 parse_and_run_string(funcp->body_as_string);
7506 rc = G.last_exitcode;
7507 } else
7508# endif
7509 {
7510 rc = run_list(funcp->body);
7511 }
7512
Denys Vlasenko332e4112018-04-04 22:32:59 +02007513 IF_HUSH_LOCAL(G.func_nest_level--;)
Denys Vlasenkod358b0b2018-04-05 00:51:55 +02007514 IF_HUSH_LOCAL(leave_var_nest_level();)
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007515
Denys Vlasenko04b46bc2016-10-01 22:28:03 +02007516 G_flag_return_in_progress = sv_flg;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007517
7518 restore_G_args(&sv, argv);
7519
7520 return rc;
7521}
7522#endif /* ENABLE_HUSH_FUNCTIONS */
7523
7524
7525#if BB_MMU
7526#define exec_builtin(to_free, x, argv) \
7527 exec_builtin(x, argv)
7528#else
7529#define exec_builtin(to_free, x, argv) \
7530 exec_builtin(to_free, argv)
7531#endif
7532static void exec_builtin(char ***to_free,
7533 const struct built_in_command *x,
7534 char **argv) NORETURN;
7535static void exec_builtin(char ***to_free,
7536 const struct built_in_command *x,
7537 char **argv)
7538{
7539#if BB_MMU
Denys Vlasenko8ee2ada2011-02-07 02:03:51 +01007540 int rcode;
7541 fflush_all();
Denys Vlasenko5b3d2eb2017-07-31 18:02:28 +02007542//? close_saved_fds_and_FILE_fds();
Denys Vlasenko8ee2ada2011-02-07 02:03:51 +01007543 rcode = x->b_function(argv);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007544 fflush_all();
7545 _exit(rcode);
7546#else
Denys Vlasenko8ee2ada2011-02-07 02:03:51 +01007547 fflush_all();
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007548 /* On NOMMU, we must never block!
7549 * Example: { sleep 99 | read line; } & echo Ok
7550 */
7551 re_execute_shell(to_free,
7552 argv[0],
7553 G.global_argv[0],
7554 G.global_argv + 1,
7555 argv);
7556#endif
7557}
7558
7559
7560static void execvp_or_die(char **argv) NORETURN;
7561static void execvp_or_die(char **argv)
7562{
Denys Vlasenko04465da2016-10-03 01:01:15 +02007563 int e;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007564 debug_printf_exec("execing '%s'\n", argv[0]);
Denys Vlasenko75e77de2011-05-12 13:12:47 +02007565 /* Don't propagate SIG_IGN to the child */
7566 if (SPECIAL_JOBSTOP_SIGS != 0)
7567 switch_off_special_sigs(G.special_sig_mask & SPECIAL_JOBSTOP_SIGS);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007568 execvp(argv[0], argv);
Denys Vlasenko04465da2016-10-03 01:01:15 +02007569 e = 2;
7570 if (errno == EACCES) e = 126;
7571 if (errno == ENOENT) e = 127;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007572 bb_perror_msg("can't execute '%s'", argv[0]);
Denys Vlasenko04465da2016-10-03 01:01:15 +02007573 _exit(e);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007574}
7575
7576#if ENABLE_HUSH_MODE_X
7577static void dump_cmd_in_x_mode(char **argv)
7578{
7579 if (G_x_mode && argv) {
7580 /* We want to output the line in one write op */
7581 char *buf, *p;
7582 int len;
7583 int n;
7584
7585 len = 3;
7586 n = 0;
7587 while (argv[n])
7588 len += strlen(argv[n++]) + 1;
7589 buf = xmalloc(len);
7590 buf[0] = '+';
7591 p = buf + 1;
7592 n = 0;
7593 while (argv[n])
7594 p += sprintf(p, " %s", argv[n++]);
7595 *p++ = '\n';
7596 *p = '\0';
7597 fputs(buf, stderr);
7598 free(buf);
7599 }
7600}
7601#else
7602# define dump_cmd_in_x_mode(argv) ((void)0)
7603#endif
7604
Denys Vlasenko57000292018-01-12 14:41:45 +01007605#if ENABLE_HUSH_COMMAND
7606static void if_command_vV_print_and_exit(char opt_vV, char *cmd, const char *explanation)
7607{
7608 char *to_free;
Denys Vlasenkoafb73a22018-01-12 16:17:59 +01007609
Denys Vlasenko57000292018-01-12 14:41:45 +01007610 if (!opt_vV)
7611 return;
7612
7613 to_free = NULL;
7614 if (!explanation) {
7615 char *path = getenv("PATH");
7616 explanation = to_free = find_executable(cmd, &path); /* path == NULL is ok */
Denys Vlasenkoafb73a22018-01-12 16:17:59 +01007617 if (!explanation)
7618 _exit(1); /* PROG was not found */
Denys Vlasenko57000292018-01-12 14:41:45 +01007619 if (opt_vV != 'V')
7620 cmd = to_free; /* -v PROG prints "/path/to/PROG" */
7621 }
Denys Vlasenkoafb73a22018-01-12 16:17:59 +01007622 printf((opt_vV == 'V') ? "%s is %s\n" : "%s\n", cmd, explanation);
Denys Vlasenko57000292018-01-12 14:41:45 +01007623 free(to_free);
7624 fflush_all();
Denys Vlasenkoafb73a22018-01-12 16:17:59 +01007625 _exit(0);
Denys Vlasenko57000292018-01-12 14:41:45 +01007626}
7627#else
7628# define if_command_vV_print_and_exit(a,b,c) ((void)0)
7629#endif
7630
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007631#if BB_MMU
7632#define pseudo_exec_argv(nommu_save, argv, assignment_cnt, argv_expanded) \
7633 pseudo_exec_argv(argv, assignment_cnt, argv_expanded)
7634#define pseudo_exec(nommu_save, command, argv_expanded) \
7635 pseudo_exec(command, argv_expanded)
7636#endif
7637
7638/* Called after [v]fork() in run_pipe, or from builtin_exec.
7639 * Never returns.
7640 * Don't exit() here. If you don't exec, use _exit instead.
7641 * The at_exit handlers apparently confuse the calling process,
Denys Vlasenko215b0ca2016-08-19 18:23:56 +02007642 * in particular stdin handling. Not sure why? -- because of vfork! (vda)
Denys Vlasenko215b0ca2016-08-19 18:23:56 +02007643 */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007644static void pseudo_exec_argv(nommu_save_t *nommu_save,
7645 char **argv, int assignment_cnt,
7646 char **argv_expanded) NORETURN;
7647static NOINLINE void pseudo_exec_argv(nommu_save_t *nommu_save,
7648 char **argv, int assignment_cnt,
7649 char **argv_expanded)
7650{
Denys Vlasenko57000292018-01-12 14:41:45 +01007651 const struct built_in_command *x;
Denys Vlasenko929a41d2018-04-05 14:09:14 +02007652 struct variable **sv_shadowed;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007653 char **new_env;
Denys Vlasenko34f6b122018-04-05 11:30:17 +02007654 IF_HUSH_COMMAND(char opt_vV = 0;)
7655 IF_HUSH_FUNCTIONS(const struct function *funcp;)
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007656
7657 new_env = expand_assignments(argv, assignment_cnt);
7658 dump_cmd_in_x_mode(new_env);
7659
7660 if (!argv[assignment_cnt]) {
7661 /* Case when we are here: ... | var=val | ...
7662 * (note that we do not exit early, i.e., do not optimize out
7663 * expand_assignments(): think about ... | var=`sleep 1` | ...
7664 */
7665 free_strings(new_env);
7666 _exit(EXIT_SUCCESS);
7667 }
7668
Denys Vlasenko929a41d2018-04-05 14:09:14 +02007669 sv_shadowed = G.shadowed_vars_pp;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007670#if BB_MMU
Denys Vlasenko929a41d2018-04-05 14:09:14 +02007671 G.shadowed_vars_pp = NULL; /* "don't save, free them instead" */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007672#else
Denys Vlasenko929a41d2018-04-05 14:09:14 +02007673 G.shadowed_vars_pp = &nommu_save->old_vars;
Denys Vlasenko9db344a2018-04-09 19:05:11 +02007674 G.var_nest_level++;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007675#endif
Denys Vlasenko929a41d2018-04-05 14:09:14 +02007676 set_vars_and_save_old(new_env);
7677 G.shadowed_vars_pp = sv_shadowed;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007678
7679 if (argv_expanded) {
7680 argv = argv_expanded;
7681 } else {
7682 argv = expand_strvec_to_strvec(argv + assignment_cnt);
7683#if !BB_MMU
7684 nommu_save->argv = argv;
7685#endif
7686 }
7687 dump_cmd_in_x_mode(argv);
7688
7689#if ENABLE_FEATURE_SH_STANDALONE || BB_MMU
7690 if (strchr(argv[0], '/') != NULL)
7691 goto skip;
7692#endif
7693
Denys Vlasenko75481d32017-07-31 05:27:09 +02007694#if ENABLE_HUSH_FUNCTIONS
7695 /* Check if the command matches any functions (this goes before bltins) */
Denys Vlasenko34f6b122018-04-05 11:30:17 +02007696 funcp = find_function(argv[0]);
7697 if (funcp)
7698 exec_function(&nommu_save->argv_from_re_execing, funcp, argv);
Denys Vlasenko75481d32017-07-31 05:27:09 +02007699#endif
7700
Denys Vlasenko57000292018-01-12 14:41:45 +01007701#if ENABLE_HUSH_COMMAND
7702 /* "command BAR": run BAR without looking it up among functions
7703 * "command -v BAR": print "BAR" or "/path/to/BAR"; or exit 1
7704 * "command -V BAR": print "BAR is {a function,a shell builtin,/path/to/BAR}"
7705 */
7706 while (strcmp(argv[0], "command") == 0 && argv[1]) {
7707 char *p;
7708
7709 argv++;
7710 p = *argv;
7711 if (p[0] != '-' || !p[1])
7712 continue; /* bash allows "command command command [-OPT] BAR" */
7713
7714 for (;;) {
7715 p++;
7716 switch (*p) {
7717 case '\0':
7718 argv++;
7719 p = *argv;
7720 if (p[0] != '-' || !p[1])
7721 goto after_opts;
7722 continue; /* next arg is also -opts, process it too */
7723 case 'v':
7724 case 'V':
7725 opt_vV = *p;
7726 continue;
7727 default:
7728 bb_error_msg_and_die("%s: %s: invalid option", "command", argv[0]);
7729 }
7730 }
7731 }
7732 after_opts:
7733# if ENABLE_HUSH_FUNCTIONS
7734 if (opt_vV && find_function(argv[0]))
7735 if_command_vV_print_and_exit(opt_vV, argv[0], "a function");
7736# endif
7737#endif
7738
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007739 /* Check if the command matches any of the builtins.
7740 * Depending on context, this might be redundant. But it's
7741 * easier to waste a few CPU cycles than it is to figure out
7742 * if this is one of those cases.
7743 */
Denys Vlasenko57000292018-01-12 14:41:45 +01007744 /* Why "BB_MMU ? :" difference in logic? -
7745 * On NOMMU, it is more expensive to re-execute shell
7746 * just in order to run echo or test builtin.
7747 * It's better to skip it here and run corresponding
7748 * non-builtin later. */
7749 x = BB_MMU ? find_builtin(argv[0]) : find_builtin1(argv[0]);
7750 if (x) {
7751 if_command_vV_print_and_exit(opt_vV, argv[0], "a shell builtin");
7752 exec_builtin(&nommu_save->argv_from_re_execing, x, argv);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007753 }
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007754
7755#if ENABLE_FEATURE_SH_STANDALONE
7756 /* Check if the command matches any busybox applets */
7757 {
7758 int a = find_applet_by_name(argv[0]);
7759 if (a >= 0) {
Denys Vlasenko57000292018-01-12 14:41:45 +01007760 if_command_vV_print_and_exit(opt_vV, argv[0], "an applet");
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007761# if BB_MMU /* see above why on NOMMU it is not allowed */
7762 if (APPLET_IS_NOEXEC(a)) {
Denys Vlasenkobf1c3442017-07-31 04:54:53 +02007763 /* Do not leak open fds from opened script files etc.
7764 * Testcase: interactive "ls -l /proc/self/fd"
7765 * should not show tty fd open.
7766 */
Denys Vlasenko5b3d2eb2017-07-31 18:02:28 +02007767 close_saved_fds_and_FILE_fds();
Denys Vlasenko75481d32017-07-31 05:27:09 +02007768//FIXME: should also close saved redir fds
Denys Vlasenko9acd63c2018-03-28 18:35:07 +02007769//This casuses test failures in
7770//redir_children_should_not_see_saved_fd_2.tests
7771//redir_children_should_not_see_saved_fd_3.tests
7772//if you replace "busybox find" with just "find" in them
Denys Vlasenko7c40ddd2017-08-02 16:37:39 +02007773 /* Without this, "rm -i FILE" can't be ^C'ed: */
7774 switch_off_special_sigs(G.special_sig_mask);
Denys Vlasenkoc9c1ccc2017-08-07 18:59:35 +02007775 debug_printf_exec("running applet '%s'\n", argv[0]);
Denys Vlasenko80e8e3c2017-08-07 19:24:57 +02007776 run_noexec_applet_and_exit(a, argv[0], argv);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007777 }
7778# endif
7779 /* Re-exec ourselves */
7780 debug_printf_exec("re-execing applet '%s'\n", argv[0]);
Denys Vlasenko75e77de2011-05-12 13:12:47 +02007781 /* Don't propagate SIG_IGN to the child */
7782 if (SPECIAL_JOBSTOP_SIGS != 0)
7783 switch_off_special_sigs(G.special_sig_mask & SPECIAL_JOBSTOP_SIGS);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007784 execv(bb_busybox_exec_path, argv);
7785 /* If they called chroot or otherwise made the binary no longer
7786 * executable, fall through */
7787 }
7788 }
7789#endif
7790
7791#if ENABLE_FEATURE_SH_STANDALONE || BB_MMU
7792 skip:
7793#endif
Denys Vlasenko57000292018-01-12 14:41:45 +01007794 if_command_vV_print_and_exit(opt_vV, argv[0], NULL);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007795 execvp_or_die(argv);
7796}
7797
7798/* Called after [v]fork() in run_pipe
7799 */
7800static void pseudo_exec(nommu_save_t *nommu_save,
7801 struct command *command,
7802 char **argv_expanded) NORETURN;
7803static void pseudo_exec(nommu_save_t *nommu_save,
7804 struct command *command,
7805 char **argv_expanded)
7806{
Denys Vlasenko49015a62018-04-03 13:02:43 +02007807#if ENABLE_HUSH_FUNCTIONS
7808 if (command->cmd_type == CMD_FUNCDEF) {
7809 /* Ignore funcdefs in pipes:
7810 * true | f() { cmd }
7811 */
7812 _exit(0);
7813 }
7814#endif
7815
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007816 if (command->argv) {
7817 pseudo_exec_argv(nommu_save, command->argv,
7818 command->assignment_cnt, argv_expanded);
7819 }
7820
7821 if (command->group) {
7822 /* Cases when we are here:
7823 * ( list )
7824 * { list } &
7825 * ... | ( list ) | ...
7826 * ... | { list } | ...
7827 */
7828#if BB_MMU
7829 int rcode;
7830 debug_printf_exec("pseudo_exec: run_list\n");
7831 reset_traps_to_defaults();
7832 rcode = run_list(command->group);
7833 /* OK to leak memory by not calling free_pipe_list,
7834 * since this process is about to exit */
7835 _exit(rcode);
7836#else
7837 re_execute_shell(&nommu_save->argv_from_re_execing,
7838 command->group_as_string,
7839 G.global_argv[0],
7840 G.global_argv + 1,
7841 NULL);
7842#endif
7843 }
7844
7845 /* Case when we are here: ... | >file */
7846 debug_printf_exec("pseudo_exec'ed null command\n");
7847 _exit(EXIT_SUCCESS);
7848}
7849
7850#if ENABLE_HUSH_JOB
7851static const char *get_cmdtext(struct pipe *pi)
7852{
7853 char **argv;
7854 char *p;
7855 int len;
7856
7857 /* This is subtle. ->cmdtext is created only on first backgrounding.
7858 * (Think "cat, <ctrl-z>, fg, <ctrl-z>, fg, <ctrl-z>...." here...)
7859 * On subsequent bg argv is trashed, but we won't use it */
7860 if (pi->cmdtext)
7861 return pi->cmdtext;
Denys Vlasenko1eada9a2016-11-08 17:28:45 +01007862
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007863 argv = pi->cmds[0].argv;
Denys Vlasenko1eada9a2016-11-08 17:28:45 +01007864 if (!argv) {
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007865 pi->cmdtext = xzalloc(1);
7866 return pi->cmdtext;
7867 }
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007868 len = 0;
7869 do {
7870 len += strlen(*argv) + 1;
7871 } while (*++argv);
7872 p = xmalloc(len);
7873 pi->cmdtext = p;
7874 argv = pi->cmds[0].argv;
7875 do {
Denys Vlasenko1eada9a2016-11-08 17:28:45 +01007876 p = stpcpy(p, *argv);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007877 *p++ = ' ';
7878 } while (*++argv);
7879 p[-1] = '\0';
7880 return pi->cmdtext;
7881}
7882
Denys Vlasenko2ed74e22017-07-14 19:58:46 +02007883static void remove_job_from_table(struct pipe *pi)
7884{
7885 struct pipe *prev_pipe;
7886
7887 if (pi == G.job_list) {
7888 G.job_list = pi->next;
7889 } else {
7890 prev_pipe = G.job_list;
7891 while (prev_pipe->next != pi)
7892 prev_pipe = prev_pipe->next;
7893 prev_pipe->next = pi->next;
7894 }
7895 G.last_jobid = 0;
7896 if (G.job_list)
7897 G.last_jobid = G.job_list->jobid;
7898}
7899
7900static void delete_finished_job(struct pipe *pi)
7901{
7902 remove_job_from_table(pi);
7903 free_pipe(pi);
7904}
7905
7906static void clean_up_last_dead_job(void)
7907{
7908 if (G.job_list && !G.job_list->alive_cmds)
7909 delete_finished_job(G.job_list);
7910}
7911
Denys Vlasenko16096292017-07-10 10:00:28 +02007912static void insert_job_into_table(struct pipe *pi)
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007913{
7914 struct pipe *job, **jobp;
7915 int i;
7916
Denys Vlasenko2ed74e22017-07-14 19:58:46 +02007917 clean_up_last_dead_job();
7918
Denys Vlasenko9e55a152017-07-10 10:01:12 +02007919 /* Find the end of the list, and find next job ID to use */
7920 i = 0;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007921 jobp = &G.job_list;
Denys Vlasenko9e55a152017-07-10 10:01:12 +02007922 while ((job = *jobp) != NULL) {
7923 if (job->jobid > i)
7924 i = job->jobid;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007925 jobp = &job->next;
Denys Vlasenko9e55a152017-07-10 10:01:12 +02007926 }
7927 pi->jobid = i + 1;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007928
Denys Vlasenko9e55a152017-07-10 10:01:12 +02007929 /* Create a new job struct at the end */
7930 job = *jobp = xmemdup(pi, sizeof(*pi));
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007931 job->next = NULL;
7932 job->cmds = xzalloc(sizeof(pi->cmds[0]) * pi->num_cmds);
7933 /* Cannot copy entire pi->cmds[] vector! This causes double frees */
7934 for (i = 0; i < pi->num_cmds; i++) {
7935 job->cmds[i].pid = pi->cmds[i].pid;
7936 /* all other fields are not used and stay zero */
7937 }
7938 job->cmdtext = xstrdup(get_cmdtext(pi));
7939
7940 if (G_interactive_fd)
Denys Vlasenkod5b5c2f2017-01-08 15:46:04 +01007941 printf("[%u] %u %s\n", job->jobid, (unsigned)job->cmds[0].pid, job->cmdtext);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007942 G.last_jobid = job->jobid;
7943}
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007944#endif /* JOB */
7945
Denys Vlasenko62b717b2016-11-07 22:12:18 +01007946static int job_exited_or_stopped(struct pipe *pi)
7947{
7948 int rcode, i;
7949
7950 if (pi->alive_cmds != pi->stopped_cmds)
7951 return -1;
7952
7953 /* All processes in fg pipe have exited or stopped */
7954 rcode = 0;
7955 i = pi->num_cmds;
7956 while (--i >= 0) {
7957 rcode = pi->cmds[i].cmd_exitcode;
7958 /* usually last process gives overall exitstatus,
7959 * but with "set -o pipefail", last *failed* process does */
7960 if (G.o_opt[OPT_O_PIPEFAIL] == 0 || rcode != 0)
7961 break;
7962 }
7963 IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;)
7964 return rcode;
7965}
7966
Denys Vlasenko7e675362016-10-28 21:57:31 +02007967static int process_wait_result(struct pipe *fg_pipe, pid_t childpid, int status)
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007968{
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007969#if ENABLE_HUSH_JOB
7970 struct pipe *pi;
7971#endif
Denys Vlasenko7e675362016-10-28 21:57:31 +02007972 int i, dead;
7973
7974 dead = WIFEXITED(status) || WIFSIGNALED(status);
7975
7976#if DEBUG_JOBS
7977 if (WIFSTOPPED(status))
7978 debug_printf_jobs("pid %d stopped by sig %d (exitcode %d)\n",
7979 childpid, WSTOPSIG(status), WEXITSTATUS(status));
7980 if (WIFSIGNALED(status))
7981 debug_printf_jobs("pid %d killed by sig %d (exitcode %d)\n",
7982 childpid, WTERMSIG(status), WEXITSTATUS(status));
7983 if (WIFEXITED(status))
7984 debug_printf_jobs("pid %d exited, exitcode %d\n",
7985 childpid, WEXITSTATUS(status));
7986#endif
7987 /* Were we asked to wait for a fg pipe? */
7988 if (fg_pipe) {
7989 i = fg_pipe->num_cmds;
Denys Vlasenko62b717b2016-11-07 22:12:18 +01007990
Denys Vlasenko7e675362016-10-28 21:57:31 +02007991 while (--i >= 0) {
Denys Vlasenko62b717b2016-11-07 22:12:18 +01007992 int rcode;
7993
Denys Vlasenko7e675362016-10-28 21:57:31 +02007994 debug_printf_jobs("check pid %d\n", fg_pipe->cmds[i].pid);
7995 if (fg_pipe->cmds[i].pid != childpid)
7996 continue;
7997 if (dead) {
7998 int ex;
7999 fg_pipe->cmds[i].pid = 0;
8000 fg_pipe->alive_cmds--;
8001 ex = WEXITSTATUS(status);
8002 /* bash prints killer signal's name for *last*
8003 * process in pipe (prints just newline for SIGINT/SIGPIPE).
8004 * Mimic this. Example: "sleep 5" + (^\ or kill -QUIT)
8005 */
8006 if (WIFSIGNALED(status)) {
8007 int sig = WTERMSIG(status);
8008 if (i == fg_pipe->num_cmds-1)
8009 /* TODO: use strsignal() instead for bash compat? but that's bloat... */
8010 puts(sig == SIGINT || sig == SIGPIPE ? "" : get_signame(sig));
8011 /* TODO: if (WCOREDUMP(status)) + " (core dumped)"; */
8012 /* TODO: MIPS has 128 sigs (1..128), what if sig==128 here?
8013 * Maybe we need to use sig | 128? */
8014 ex = sig + 128;
8015 }
8016 fg_pipe->cmds[i].cmd_exitcode = ex;
8017 } else {
8018 fg_pipe->stopped_cmds++;
8019 }
8020 debug_printf_jobs("fg_pipe: alive_cmds %d stopped_cmds %d\n",
8021 fg_pipe->alive_cmds, fg_pipe->stopped_cmds);
Denys Vlasenko62b717b2016-11-07 22:12:18 +01008022 rcode = job_exited_or_stopped(fg_pipe);
8023 if (rcode >= 0) {
Denys Vlasenko7e675362016-10-28 21:57:31 +02008024/* Note: *non-interactive* bash does not continue if all processes in fg pipe
8025 * are stopped. Testcase: "cat | cat" in a script (not on command line!)
8026 * and "killall -STOP cat" */
8027 if (G_interactive_fd) {
8028#if ENABLE_HUSH_JOB
8029 if (fg_pipe->alive_cmds != 0)
Denys Vlasenko16096292017-07-10 10:00:28 +02008030 insert_job_into_table(fg_pipe);
Denys Vlasenko7e675362016-10-28 21:57:31 +02008031#endif
8032 return rcode;
8033 }
8034 if (fg_pipe->alive_cmds == 0)
8035 return rcode;
8036 }
8037 /* There are still running processes in the fg_pipe */
8038 return -1;
8039 }
Denys Vlasenko10ad6222017-04-17 16:13:32 +02008040 /* It wasn't in fg_pipe, look for process in bg pipes */
Denys Vlasenko7e675362016-10-28 21:57:31 +02008041 }
8042
8043#if ENABLE_HUSH_JOB
8044 /* We were asked to wait for bg or orphaned children */
8045 /* No need to remember exitcode in this case */
8046 for (pi = G.job_list; pi; pi = pi->next) {
8047 for (i = 0; i < pi->num_cmds; i++) {
8048 if (pi->cmds[i].pid == childpid)
8049 goto found_pi_and_prognum;
8050 }
8051 }
8052 /* Happens when shell is used as init process (init=/bin/sh) */
8053 debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
8054 return -1; /* this wasn't a process from fg_pipe */
8055
8056 found_pi_and_prognum:
8057 if (dead) {
8058 /* child exited */
Denys Vlasenko840a4352017-07-07 22:56:02 +02008059 int rcode = WEXITSTATUS(status);
Denys Vlasenko7e675362016-10-28 21:57:31 +02008060 if (WIFSIGNALED(status))
Denys Vlasenko840a4352017-07-07 22:56:02 +02008061 rcode = 128 + WTERMSIG(status);
8062 pi->cmds[i].cmd_exitcode = rcode;
8063 if (G.last_bg_pid == pi->cmds[i].pid)
8064 G.last_bg_pid_exitcode = rcode;
8065 pi->cmds[i].pid = 0;
Denys Vlasenko7e675362016-10-28 21:57:31 +02008066 pi->alive_cmds--;
8067 if (!pi->alive_cmds) {
Denys Vlasenko2ed74e22017-07-14 19:58:46 +02008068 if (G_interactive_fd) {
Denys Vlasenko7e675362016-10-28 21:57:31 +02008069 printf(JOB_STATUS_FORMAT, pi->jobid,
8070 "Done", pi->cmdtext);
Denys Vlasenko2ed74e22017-07-14 19:58:46 +02008071 delete_finished_job(pi);
8072 } else {
8073/*
8074 * bash deletes finished jobs from job table only in interactive mode,
8075 * after "jobs" cmd, or if pid of a new process matches one of the old ones
8076 * (see cleanup_dead_jobs(), delete_old_job(), J_NOTIFIED in bash source).
8077 * Testcase script: "(exit 3) & sleep 1; wait %1; echo $?" prints 3 in bash.
8078 * We only retain one "dead" job, if it's the single job on the list.
8079 * This covers most of real-world scenarios where this is useful.
8080 */
8081 if (pi != G.job_list)
8082 delete_finished_job(pi);
8083 }
Denys Vlasenko7e675362016-10-28 21:57:31 +02008084 }
8085 } else {
8086 /* child stopped */
8087 pi->stopped_cmds++;
8088 }
8089#endif
8090 return -1; /* this wasn't a process from fg_pipe */
8091}
8092
8093/* Check to see if any processes have exited -- if they have,
8094 * figure out why and see if a job has completed.
Denys Vlasenko62b717b2016-11-07 22:12:18 +01008095 *
8096 * If non-NULL fg_pipe: wait for its completion or stop.
8097 * Return its exitcode or zero if stopped.
8098 *
8099 * Alternatively (fg_pipe == NULL, waitfor_pid != 0):
8100 * waitpid(WNOHANG), if waitfor_pid exits or stops, return exitcode+1,
8101 * else return <0 if waitpid errors out (e.g. ECHILD: nothing to wait for)
8102 * or 0 if no children changed status.
8103 *
8104 * Alternatively (fg_pipe == NULL, waitfor_pid == 0),
8105 * return <0 if waitpid errors out (e.g. ECHILD: nothing to wait for)
8106 * or 0 if no children changed status.
Denys Vlasenko7e675362016-10-28 21:57:31 +02008107 */
8108static int checkjobs(struct pipe *fg_pipe, pid_t waitfor_pid)
8109{
8110 int attributes;
8111 int status;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008112 int rcode = 0;
8113
8114 debug_printf_jobs("checkjobs %p\n", fg_pipe);
8115
8116 attributes = WUNTRACED;
8117 if (fg_pipe == NULL)
8118 attributes |= WNOHANG;
8119
8120 errno = 0;
8121#if ENABLE_HUSH_FAST
8122 if (G.handled_SIGCHLD == G.count_SIGCHLD) {
8123//bb_error_msg("[%d] checkjobs: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d children?:%d fg_pipe:%p",
8124//getpid(), G.count_SIGCHLD, G.handled_SIGCHLD, G.we_have_children, fg_pipe);
8125 /* There was neither fork nor SIGCHLD since last waitpid */
8126 /* Avoid doing waitpid syscall if possible */
8127 if (!G.we_have_children) {
8128 errno = ECHILD;
8129 return -1;
8130 }
8131 if (fg_pipe == NULL) { /* is WNOHANG set? */
8132 /* We have children, but they did not exit
8133 * or stop yet (we saw no SIGCHLD) */
8134 return 0;
8135 }
8136 /* else: !WNOHANG, waitpid will block, can't short-circuit */
8137 }
8138#endif
8139
8140/* Do we do this right?
8141 * bash-3.00# sleep 20 | false
8142 * <ctrl-Z pressed>
8143 * [3]+ Stopped sleep 20 | false
8144 * bash-3.00# echo $?
8145 * 1 <========== bg pipe is not fully done, but exitcode is already known!
8146 * [hush 1.14.0: yes we do it right]
8147 */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008148 while (1) {
Denys Vlasenko7e675362016-10-28 21:57:31 +02008149 pid_t childpid;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008150#if ENABLE_HUSH_FAST
Denys Vlasenko7e675362016-10-28 21:57:31 +02008151 int i;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008152 i = G.count_SIGCHLD;
8153#endif
8154 childpid = waitpid(-1, &status, attributes);
8155 if (childpid <= 0) {
8156 if (childpid && errno != ECHILD)
8157 bb_perror_msg("waitpid");
8158#if ENABLE_HUSH_FAST
8159 else { /* Until next SIGCHLD, waitpid's are useless */
8160 G.we_have_children = (childpid == 0);
8161 G.handled_SIGCHLD = i;
8162//bb_error_msg("[%d] checkjobs: waitpid returned <= 0, G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD);
8163 }
8164#endif
Denys Vlasenko7e675362016-10-28 21:57:31 +02008165 /* ECHILD (no children), or 0 (no change in children status) */
8166 rcode = childpid;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008167 break;
8168 }
Denys Vlasenko7e675362016-10-28 21:57:31 +02008169 rcode = process_wait_result(fg_pipe, childpid, status);
8170 if (rcode >= 0) {
8171 /* fg_pipe exited or stopped */
8172 break;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008173 }
Denys Vlasenko7e675362016-10-28 21:57:31 +02008174 if (childpid == waitfor_pid) {
Denys Vlasenko62b717b2016-11-07 22:12:18 +01008175 debug_printf_exec("childpid==waitfor_pid:%d status:0x%08x\n", childpid, status);
Denys Vlasenko7e675362016-10-28 21:57:31 +02008176 rcode = WEXITSTATUS(status);
8177 if (WIFSIGNALED(status))
8178 rcode = 128 + WTERMSIG(status);
Denys Vlasenko62b717b2016-11-07 22:12:18 +01008179 if (WIFSTOPPED(status))
8180 /* bash: "cmd & wait $!" and cmd stops: $? = 128 + stopsig */
8181 rcode = 128 + WSTOPSIG(status);
Denys Vlasenko7e675362016-10-28 21:57:31 +02008182 rcode++;
8183 break; /* "wait PID" called us, give it exitcode+1 */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008184 }
Denys Vlasenko7e675362016-10-28 21:57:31 +02008185 /* This wasn't one of our processes, or */
8186 /* fg_pipe still has running processes, do waitpid again */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008187 } /* while (waitpid succeeds)... */
8188
8189 return rcode;
8190}
8191
8192#if ENABLE_HUSH_JOB
Denys Vlasenkoda463fb2010-09-07 09:53:50 +02008193static int checkjobs_and_fg_shell(struct pipe *fg_pipe)
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008194{
8195 pid_t p;
Denys Vlasenko7e675362016-10-28 21:57:31 +02008196 int rcode = checkjobs(fg_pipe, 0 /*(no pid to wait for)*/);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008197 if (G_saved_tty_pgrp) {
8198 /* Job finished, move the shell to the foreground */
8199 p = getpgrp(); /* our process group id */
8200 debug_printf_jobs("fg'ing ourself: getpgrp()=%d\n", (int)p);
8201 tcsetpgrp(G_interactive_fd, p);
8202 }
8203 return rcode;
8204}
8205#endif
8206
8207/* Start all the jobs, but don't wait for anything to finish.
8208 * See checkjobs().
8209 *
8210 * Return code is normally -1, when the caller has to wait for children
8211 * to finish to determine the exit status of the pipe. If the pipe
8212 * is a simple builtin command, however, the action is done by the
8213 * time run_pipe returns, and the exit code is provided as the
8214 * return value.
8215 *
8216 * Returns -1 only if started some children. IOW: we have to
8217 * mask out retvals of builtins etc with 0xff!
8218 *
8219 * The only case when we do not need to [v]fork is when the pipe
8220 * is single, non-backgrounded, non-subshell command. Examples:
8221 * cmd ; ... { list } ; ...
8222 * cmd && ... { list } && ...
8223 * cmd || ... { list } || ...
Denys Vlasenkob72baeb2011-02-02 18:38:57 +01008224 * If it is, then we can run cmd as a builtin, NOFORK,
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008225 * or (if SH_STANDALONE) an applet, and we can run the { list }
8226 * with run_list. If it isn't one of these, we fork and exec cmd.
8227 *
8228 * Cases when we must fork:
8229 * non-single: cmd | cmd
8230 * backgrounded: cmd & { list } &
8231 * subshell: ( list ) [&]
8232 */
8233#if !ENABLE_HUSH_MODE_X
Denys Vlasenkod358b0b2018-04-05 00:51:55 +02008234#define redirect_and_varexp_helper(old_vars_p, command, squirrel, argv_expanded) \
8235 redirect_and_varexp_helper(old_vars_p, command, squirrel)
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008236#endif
Denys Vlasenkod358b0b2018-04-05 00:51:55 +02008237static int redirect_and_varexp_helper(
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008238 struct command *command,
Denys Vlasenko2db74612017-07-07 22:07:28 +02008239 struct squirrel **sqp,
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008240 char **argv_expanded)
8241{
Denys Vlasenko41d8f102018-04-05 14:41:21 +02008242 /* Assignments occur before redirects. Try:
8243 * a=`sleep 1` sleep 2 3>/qwe/rty
8244 */
8245
8246 char **new_env = expand_assignments(command->argv, command->assignment_cnt);
8247 dump_cmd_in_x_mode(new_env);
8248 dump_cmd_in_x_mode(argv_expanded);
8249 /* this takes ownership of new_env[i] elements, and frees new_env: */
8250 set_vars_and_save_old(new_env);
8251
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008252 /* setup_redirects acts on file descriptors, not FILEs.
8253 * This is perfect for work that comes after exec().
8254 * Is it really safe for inline use? Experimentally,
8255 * things seem to work. */
Denys Vlasenko41d8f102018-04-05 14:41:21 +02008256 return setup_redirects(command, sqp);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008257}
8258static NOINLINE int run_pipe(struct pipe *pi)
8259{
8260 static const char *const null_ptr = NULL;
8261
8262 int cmd_no;
8263 int next_infd;
8264 struct command *command;
8265 char **argv_expanded;
8266 char **argv;
Denys Vlasenko2db74612017-07-07 22:07:28 +02008267 struct squirrel *squirrel = NULL;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008268 int rcode;
8269
8270 debug_printf_exec("run_pipe start: members:%d\n", pi->num_cmds);
8271 debug_enter();
8272
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02008273 /* Testcase: set -- q w e; (IFS='' echo "$*"; IFS=''; echo "$*"); echo "$*"
8274 * Result should be 3 lines: q w e, qwe, q w e
8275 */
8276 G.ifs = get_local_var_value("IFS");
8277 if (!G.ifs)
8278 G.ifs = defifs;
8279
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008280 IF_HUSH_JOB(pi->pgrp = -1;)
8281 pi->stopped_cmds = 0;
8282 command = &pi->cmds[0];
8283 argv_expanded = NULL;
8284
8285 if (pi->num_cmds != 1
8286 || pi->followup == PIPE_BG
8287 || command->cmd_type == CMD_SUBSHELL
8288 ) {
8289 goto must_fork;
8290 }
8291
8292 pi->alive_cmds = 1;
8293
8294 debug_printf_exec(": group:%p argv:'%s'\n",
8295 command->group, command->argv ? command->argv[0] : "NONE");
8296
8297 if (command->group) {
8298#if ENABLE_HUSH_FUNCTIONS
8299 if (command->cmd_type == CMD_FUNCDEF) {
8300 /* "executing" func () { list } */
8301 struct function *funcp;
8302
8303 funcp = new_function(command->argv[0]);
8304 /* funcp->name is already set to argv[0] */
8305 funcp->body = command->group;
8306# if !BB_MMU
8307 funcp->body_as_string = command->group_as_string;
8308 command->group_as_string = NULL;
8309# endif
8310 command->group = NULL;
8311 command->argv[0] = NULL;
8312 debug_printf_exec("cmd %p has child func at %p\n", command, funcp);
8313 funcp->parent_cmd = command;
8314 command->child_func = funcp;
8315
8316 debug_printf_exec("run_pipe: return EXIT_SUCCESS\n");
8317 debug_leave();
8318 return EXIT_SUCCESS;
8319 }
8320#endif
8321 /* { list } */
8322 debug_printf("non-subshell group\n");
8323 rcode = 1; /* exitcode if redir failed */
Denys Vlasenko2db74612017-07-07 22:07:28 +02008324 if (setup_redirects(command, &squirrel) == 0) {
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008325 debug_printf_exec(": run_list\n");
Denys Vlasenkod1b84572018-03-28 18:42:54 +02008326//FIXME: we need to pass squirrel down into run_list()
8327//for SH_STANDALONE case, or else this construct:
8328// { find /proc/self/fd; true; } >FILE; cmd2
8329//has no way of closing saved fd#1 for "find",
8330//and in SH_STANDALONE mode, "find" is not execed,
8331//therefore CLOEXEC on saved fd does not help.
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008332 rcode = run_list(command->group) & 0xff;
8333 }
8334 restore_redirects(squirrel);
8335 IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;)
8336 debug_leave();
8337 debug_printf_exec("run_pipe: return %d\n", rcode);
8338 return rcode;
8339 }
8340
8341 argv = command->argv ? command->argv : (char **) &null_ptr;
8342 {
8343 const struct built_in_command *x;
Denys Vlasenkod358b0b2018-04-05 00:51:55 +02008344 IF_HUSH_FUNCTIONS(const struct function *funcp;)
8345 IF_NOT_HUSH_FUNCTIONS(enum { funcp = 0 };)
Denys Vlasenko929a41d2018-04-05 14:09:14 +02008346 struct variable **sv_shadowed;
Denys Vlasenkod358b0b2018-04-05 00:51:55 +02008347 struct variable *old_vars;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008348
Denys Vlasenko5807e182018-02-08 19:19:04 +01008349#if ENABLE_HUSH_LINENO_VAR
Denys Vlasenkob8d076b2018-01-19 16:00:57 +01008350 if (G.lineno_var)
8351 strcpy(G.lineno_var + sizeof("LINENO=")-1, utoa(command->lineno));
8352#endif
Denys Vlasenko6aad1dd2018-01-19 15:37:04 +01008353
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008354 if (argv[command->assignment_cnt] == NULL) {
Denys Vlasenko5fa05052018-04-03 11:21:13 +02008355 /* Assignments, but no command.
8356 * Ensure redirects take effect (that is, create files).
8357 * Try "a=t >file"
8358 */
Denys Vlasenko21b7f1b2018-04-05 15:15:53 +02008359 unsigned i;
Denys Vlasenko5fa05052018-04-03 11:21:13 +02008360 G.expand_exitcode = 0;
Denys Vlasenko21b7f1b2018-04-05 15:15:53 +02008361 only_assignments:
Denys Vlasenko2db74612017-07-07 22:07:28 +02008362 rcode = setup_redirects(command, &squirrel);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008363 restore_redirects(squirrel);
Denys Vlasenko21b7f1b2018-04-05 15:15:53 +02008364
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008365 /* Set shell variables */
8366 if (G_x_mode)
8367 bb_putchar_stderr('+');
Denys Vlasenko21b7f1b2018-04-05 15:15:53 +02008368 i = 0;
8369 while (i < command->assignment_cnt) {
8370 char *p = expand_string_to_string(argv[i], /*unbackslash:*/ 1);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008371 if (G_x_mode)
8372 fprintf(stderr, " %s", p);
Denys Vlasenko21b7f1b2018-04-05 15:15:53 +02008373 debug_printf_env("set shell var:'%s'->'%s'\n", *argv, p);
Denys Vlasenko38ef39a2017-07-18 01:40:01 +02008374 if (set_local_var(p, /*flag:*/ 0)) {
8375 /* assignment to readonly var / putenv error? */
8376 rcode = 1;
8377 }
Denys Vlasenko21b7f1b2018-04-05 15:15:53 +02008378 i++;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008379 }
8380 if (G_x_mode)
8381 bb_putchar_stderr('\n');
8382 /* Redirect error sets $? to 1. Otherwise,
8383 * if evaluating assignment value set $?, retain it.
Denys Vlasenko5fa05052018-04-03 11:21:13 +02008384 * Else, clear $?:
8385 * false; q=`exit 2`; echo $? - should print 2
8386 * false; x=1; echo $? - should print 0
8387 * Because of the 2nd case, we can't just use G.last_exitcode.
8388 */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008389 if (rcode == 0)
Denys Vlasenko5fa05052018-04-03 11:21:13 +02008390 rcode = G.expand_exitcode;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008391 IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;)
8392 debug_leave();
8393 debug_printf_exec("run_pipe: return %d\n", rcode);
8394 return rcode;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008395 }
8396
8397 /* Expand the rest into (possibly) many strings each */
Denys Vlasenko11752d42018-04-03 08:20:58 +02008398#if defined(CMD_SINGLEWORD_NOGLOB)
Denys Vlasenko929a41d2018-04-05 14:09:14 +02008399 if (command->cmd_type == CMD_SINGLEWORD_NOGLOB)
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008400 argv_expanded = expand_strvec_to_strvec_singleword_noglob(argv + command->assignment_cnt);
Denys Vlasenko929a41d2018-04-05 14:09:14 +02008401 else
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008402#endif
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008403 argv_expanded = expand_strvec_to_strvec(argv + command->assignment_cnt);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008404
Denys Vlasenko41d8f102018-04-05 14:41:21 +02008405 /* If someone gives us an empty string: `cmd with empty output` */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008406 if (!argv_expanded[0]) {
8407 free(argv_expanded);
Denys Vlasenko21b7f1b2018-04-05 15:15:53 +02008408 /* `false` still has to set exitcode 1 */
8409 G.expand_exitcode = G.last_exitcode;
Denys Vlasenko41d8f102018-04-05 14:41:21 +02008410 goto only_assignments;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008411 }
8412
Denys Vlasenko929a41d2018-04-05 14:09:14 +02008413 old_vars = NULL;
8414 sv_shadowed = G.shadowed_vars_pp;
8415
Denys Vlasenko75481d32017-07-31 05:27:09 +02008416 /* Check if argv[0] matches any functions (this goes before bltins) */
Denys Vlasenko929a41d2018-04-05 14:09:14 +02008417 IF_HUSH_FUNCTIONS(funcp = find_function(argv_expanded[0]);)
8418 IF_HUSH_FUNCTIONS(x = NULL;)
8419 IF_HUSH_FUNCTIONS(if (!funcp))
Denys Vlasenko75481d32017-07-31 05:27:09 +02008420 x = find_builtin(argv_expanded[0]);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008421 if (x || funcp) {
Denys Vlasenko34f6b122018-04-05 11:30:17 +02008422 if (x && x->b_function == builtin_exec && argv_expanded[1] == NULL) {
8423 debug_printf("exec with redirects only\n");
Denys Vlasenko41d8f102018-04-05 14:41:21 +02008424 /*
8425 * Variable assignments are executed, but then "forgotten":
8426 * a=`sleep 1;echo A` exec 3>&-; echo $a
8427 * sleeps, but prints nothing.
8428 */
8429 enter_var_nest_level();
8430 G.shadowed_vars_pp = &old_vars;
8431 rcode = redirect_and_varexp_helper(command, /*squirrel:*/ NULL, argv_expanded);
8432 G.shadowed_vars_pp = sv_shadowed;
Denys Vlasenko34f6b122018-04-05 11:30:17 +02008433 /* rcode=1 can be if redir file can't be opened */
Denys Vlasenko41d8f102018-04-05 14:41:21 +02008434
Denys Vlasenko34f6b122018-04-05 11:30:17 +02008435 goto clean_up_and_ret1;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008436 }
Denys Vlasenkod358b0b2018-04-05 00:51:55 +02008437
Denys Vlasenko34f6b122018-04-05 11:30:17 +02008438 /* Bump var nesting, or this will leak exported $a:
Denys Vlasenkod358b0b2018-04-05 00:51:55 +02008439 * a=b true; env | grep ^a=
8440 */
8441 enter_var_nest_level();
Denys Vlasenko929a41d2018-04-05 14:09:14 +02008442 /* Collect all variables "shadowed" by helper
8443 * (IOW: old vars overridden by "var1=val1 var2=val2 cmd..." syntax)
8444 * into old_vars list:
8445 */
8446 G.shadowed_vars_pp = &old_vars;
8447 rcode = redirect_and_varexp_helper(command, &squirrel, argv_expanded);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008448 if (rcode == 0) {
8449 if (!funcp) {
Denys Vlasenko929a41d2018-04-05 14:09:14 +02008450 /* Do not collect *to old_vars list* vars shadowed
8451 * by e.g. "local VAR" builtin (collect them
8452 * in the previously nested list instead):
8453 * don't want them to be restored immediately
8454 * after "local" completes.
8455 */
8456 G.shadowed_vars_pp = sv_shadowed;
8457
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008458 debug_printf_exec(": builtin '%s' '%s'...\n",
8459 x->b_cmd, argv_expanded[1]);
Denys Vlasenko8ee2ada2011-02-07 02:03:51 +01008460 fflush_all();
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008461 rcode = x->b_function(argv_expanded) & 0xff;
8462 fflush_all();
8463 }
8464#if ENABLE_HUSH_FUNCTIONS
8465 else {
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008466 debug_printf_exec(": function '%s' '%s'...\n",
8467 funcp->name, argv_expanded[1]);
8468 rcode = run_function(funcp, argv_expanded) & 0xff;
Denys Vlasenko929a41d2018-04-05 14:09:14 +02008469 /*
8470 * But do collect *to old_vars list* vars shadowed
8471 * within function execution. To that end, restore
8472 * this pointer _after_ function run:
8473 */
8474 G.shadowed_vars_pp = sv_shadowed;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008475 }
8476#endif
8477 }
Denys Vlasenko34f6b122018-04-05 11:30:17 +02008478 } else
Denys Vlasenko82d1c1f2017-12-31 17:30:02 +01008479 if (ENABLE_FEATURE_SH_NOFORK && NUM_APPLETS > 1) {
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008480 int n = find_applet_by_name(argv_expanded[0]);
Denys Vlasenko34f6b122018-04-05 11:30:17 +02008481 if (n < 0 || !APPLET_IS_NOFORK(n))
8482 goto must_fork;
8483
8484 enter_var_nest_level();
Denys Vlasenko929a41d2018-04-05 14:09:14 +02008485 /* Collect all variables "shadowed" by helper into old_vars list */
8486 G.shadowed_vars_pp = &old_vars;
8487 rcode = redirect_and_varexp_helper(command, &squirrel, argv_expanded);
8488 G.shadowed_vars_pp = sv_shadowed;
8489
Denys Vlasenko34f6b122018-04-05 11:30:17 +02008490 if (rcode == 0) {
8491 debug_printf_exec(": run_nofork_applet '%s' '%s'...\n",
8492 argv_expanded[0], argv_expanded[1]);
8493 /*
8494 * Note: signals (^C) can't interrupt here.
8495 * We remember them and they will be acted upon
8496 * after applet returns.
8497 * This makes applets which can run for a long time
8498 * and/or wait for user input ineligible for NOFORK:
8499 * for example, "yes" or "rm" (rm -i waits for input).
8500 */
8501 rcode = run_nofork_applet(n, argv_expanded);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008502 }
Denys Vlasenko4e1dc532018-04-05 13:10:34 +02008503 } else
8504 goto must_fork;
Denys Vlasenko34f6b122018-04-05 11:30:17 +02008505
Denys Vlasenko41d8f102018-04-05 14:41:21 +02008506 restore_redirects(squirrel);
8507 clean_up_and_ret1:
Denys Vlasenko34f6b122018-04-05 11:30:17 +02008508 leave_var_nest_level();
8509 add_vars(old_vars);
Denys Vlasenko34f6b122018-04-05 11:30:17 +02008510
8511 /*
8512 * Try "usleep 99999999" + ^C + "echo $?"
8513 * with FEATURE_SH_NOFORK=y.
8514 */
8515 if (!funcp) {
8516 /* It was builtin or nofork.
8517 * if this would be a real fork/execed program,
8518 * it should have died if a fatal sig was received.
8519 * But OTOH, there was no separate process,
8520 * the sig was sent to _shell_, not to non-existing
8521 * child.
8522 * Let's just handle ^C only, this one is obvious:
8523 * we aren't ok with exitcode 0 when ^C was pressed
8524 * during builtin/nofork.
8525 */
8526 if (sigismember(&G.pending_set, SIGINT))
8527 rcode = 128 + SIGINT;
8528 }
Denys Vlasenko34f6b122018-04-05 11:30:17 +02008529 free(argv_expanded);
8530 IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;)
8531 debug_leave();
8532 debug_printf_exec("run_pipe return %d\n", rcode);
8533 return rcode;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008534 }
8535
8536 must_fork:
8537 /* NB: argv_expanded may already be created, and that
8538 * might include `cmd` runs! Do not rerun it! We *must*
8539 * use argv_expanded if it's non-NULL */
8540
8541 /* Going to fork a child per each pipe member */
8542 pi->alive_cmds = 0;
8543 next_infd = 0;
8544
8545 cmd_no = 0;
8546 while (cmd_no < pi->num_cmds) {
8547 struct fd_pair pipefds;
8548#if !BB_MMU
Denys Vlasenko9db344a2018-04-09 19:05:11 +02008549 int sv_var_nest_level = G.var_nest_level;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008550 volatile nommu_save_t nommu_save;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008551 nommu_save.old_vars = NULL;
8552 nommu_save.argv = NULL;
8553 nommu_save.argv_from_re_execing = NULL;
8554#endif
8555 command = &pi->cmds[cmd_no];
8556 cmd_no++;
8557 if (command->argv) {
8558 debug_printf_exec(": pipe member '%s' '%s'...\n",
8559 command->argv[0], command->argv[1]);
8560 } else {
8561 debug_printf_exec(": pipe member with no argv\n");
8562 }
8563
8564 /* pipes are inserted between pairs of commands */
8565 pipefds.rd = 0;
8566 pipefds.wr = 1;
8567 if (cmd_no < pi->num_cmds)
8568 xpiped_pair(pipefds);
8569
Denys Vlasenko5807e182018-02-08 19:19:04 +01008570#if ENABLE_HUSH_LINENO_VAR
Denys Vlasenkob8d076b2018-01-19 16:00:57 +01008571 if (G.lineno_var)
8572 strcpy(G.lineno_var + sizeof("LINENO=")-1, utoa(command->lineno));
8573#endif
Denys Vlasenko6aad1dd2018-01-19 15:37:04 +01008574
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008575 command->pid = BB_MMU ? fork() : vfork();
8576 if (!command->pid) { /* child */
8577#if ENABLE_HUSH_JOB
8578 disable_restore_tty_pgrp_on_exit();
8579 CLEAR_RANDOM_T(&G.random_gen); /* or else $RANDOM repeats in child */
8580
8581 /* Every child adds itself to new process group
8582 * with pgid == pid_of_first_child_in_pipe */
8583 if (G.run_list_level == 1 && G_interactive_fd) {
8584 pid_t pgrp;
8585 pgrp = pi->pgrp;
8586 if (pgrp < 0) /* true for 1st process only */
8587 pgrp = getpid();
8588 if (setpgid(0, pgrp) == 0
8589 && pi->followup != PIPE_BG
8590 && G_saved_tty_pgrp /* we have ctty */
8591 ) {
8592 /* We do it in *every* child, not just first,
8593 * to avoid races */
8594 tcsetpgrp(G_interactive_fd, pgrp);
8595 }
8596 }
8597#endif
8598 if (pi->alive_cmds == 0 && pi->followup == PIPE_BG) {
8599 /* 1st cmd in backgrounded pipe
8600 * should have its stdin /dev/null'ed */
8601 close(0);
8602 if (open(bb_dev_null, O_RDONLY))
8603 xopen("/", O_RDONLY);
8604 } else {
8605 xmove_fd(next_infd, 0);
8606 }
8607 xmove_fd(pipefds.wr, 1);
8608 if (pipefds.rd > 1)
8609 close(pipefds.rd);
8610 /* Like bash, explicit redirects override pipes,
Denys Vlasenko869994c2016-08-20 15:16:00 +02008611 * and the pipe fd (fd#1) is available for dup'ing:
8612 * "cmd1 2>&1 | cmd2": fd#1 is duped to fd#2, thus stderr
8613 * of cmd1 goes into pipe.
8614 */
8615 if (setup_redirects(command, NULL)) {
8616 /* Happens when redir file can't be opened:
8617 * $ hush -c 'echo FOO >&2 | echo BAR 3>/qwe/rty; echo BAZ'
8618 * FOO
8619 * hush: can't open '/qwe/rty': No such file or directory
8620 * BAZ
8621 * (echo BAR is not executed, it hits _exit(1) below)
8622 */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008623 _exit(1);
Denys Vlasenko869994c2016-08-20 15:16:00 +02008624 }
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008625
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008626 /* Stores to nommu_save list of env vars putenv'ed
8627 * (NOMMU, on MMU we don't need that) */
8628 /* cast away volatility... */
8629 pseudo_exec((nommu_save_t*) &nommu_save, command, argv_expanded);
8630 /* pseudo_exec() does not return */
8631 }
8632
8633 /* parent or error */
8634#if ENABLE_HUSH_FAST
8635 G.count_SIGCHLD++;
8636//bb_error_msg("[%d] fork in run_pipe: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD);
8637#endif
8638 enable_restore_tty_pgrp_on_exit();
8639#if !BB_MMU
8640 /* Clean up after vforked child */
8641 free(nommu_save.argv);
8642 free(nommu_save.argv_from_re_execing);
Denys Vlasenko9db344a2018-04-09 19:05:11 +02008643 G.var_nest_level = sv_var_nest_level;
8644 remove_nested_vars();
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008645 add_vars(nommu_save.old_vars);
8646#endif
8647 free(argv_expanded);
8648 argv_expanded = NULL;
8649 if (command->pid < 0) { /* [v]fork failed */
8650 /* Clearly indicate, was it fork or vfork */
8651 bb_perror_msg(BB_MMU ? "vfork"+1 : "vfork");
8652 } else {
8653 pi->alive_cmds++;
8654#if ENABLE_HUSH_JOB
8655 /* Second and next children need to know pid of first one */
8656 if (pi->pgrp < 0)
8657 pi->pgrp = command->pid;
8658#endif
8659 }
8660
8661 if (cmd_no > 1)
8662 close(next_infd);
8663 if (cmd_no < pi->num_cmds)
8664 close(pipefds.wr);
8665 /* Pass read (output) pipe end to next iteration */
8666 next_infd = pipefds.rd;
8667 }
8668
8669 if (!pi->alive_cmds) {
8670 debug_leave();
8671 debug_printf_exec("run_pipe return 1 (all forks failed, no children)\n");
8672 return 1;
8673 }
8674
8675 debug_leave();
8676 debug_printf_exec("run_pipe return -1 (%u children started)\n", pi->alive_cmds);
8677 return -1;
8678}
8679
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008680/* NB: called by pseudo_exec, and therefore must not modify any
8681 * global data until exec/_exit (we can be a child after vfork!) */
8682static int run_list(struct pipe *pi)
8683{
8684#if ENABLE_HUSH_CASE
8685 char *case_word = NULL;
8686#endif
8687#if ENABLE_HUSH_LOOPS
8688 struct pipe *loop_top = NULL;
8689 char **for_lcur = NULL;
8690 char **for_list = NULL;
8691#endif
8692 smallint last_followup;
8693 smalluint rcode;
8694#if ENABLE_HUSH_IF || ENABLE_HUSH_CASE
8695 smalluint cond_code = 0;
8696#else
8697 enum { cond_code = 0 };
8698#endif
8699#if HAS_KEYWORDS
Denys Vlasenko9b782552010-09-08 13:33:26 +02008700 smallint rword; /* RES_foo */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008701 smallint last_rword; /* ditto */
8702#endif
8703
8704 debug_printf_exec("run_list start lvl %d\n", G.run_list_level);
8705 debug_enter();
8706
8707#if ENABLE_HUSH_LOOPS
8708 /* Check syntax for "for" */
Denys Vlasenko0d6a4ec2010-12-18 01:34:49 +01008709 {
8710 struct pipe *cpipe;
8711 for (cpipe = pi; cpipe; cpipe = cpipe->next) {
8712 if (cpipe->res_word != RES_FOR && cpipe->res_word != RES_IN)
8713 continue;
8714 /* current word is FOR or IN (BOLD in comments below) */
8715 if (cpipe->next == NULL) {
8716 syntax_error("malformed for");
8717 debug_leave();
8718 debug_printf_exec("run_list lvl %d return 1\n", G.run_list_level);
8719 return 1;
8720 }
8721 /* "FOR v; do ..." and "for v IN a b; do..." are ok */
8722 if (cpipe->next->res_word == RES_DO)
8723 continue;
8724 /* next word is not "do". It must be "in" then ("FOR v in ...") */
8725 if (cpipe->res_word == RES_IN /* "for v IN a b; not_do..."? */
8726 || cpipe->next->res_word != RES_IN /* FOR v not_do_and_not_in..."? */
8727 ) {
8728 syntax_error("malformed for");
8729 debug_leave();
8730 debug_printf_exec("run_list lvl %d return 1\n", G.run_list_level);
8731 return 1;
8732 }
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008733 }
8734 }
8735#endif
8736
8737 /* Past this point, all code paths should jump to ret: label
8738 * in order to return, no direct "return" statements please.
8739 * This helps to ensure that no memory is leaked. */
8740
8741#if ENABLE_HUSH_JOB
8742 G.run_list_level++;
8743#endif
8744
8745#if HAS_KEYWORDS
8746 rword = RES_NONE;
8747 last_rword = RES_XXXX;
8748#endif
8749 last_followup = PIPE_SEQ;
8750 rcode = G.last_exitcode;
8751
8752 /* Go through list of pipes, (maybe) executing them. */
8753 for (; pi; pi = IF_HUSH_LOOPS(rword == RES_DONE ? loop_top : ) pi->next) {
Denys Vlasenko5cc9bf62016-11-08 17:34:44 +01008754 int r;
Denys Vlasenko9fda6092017-07-14 13:36:48 +02008755 int sv_errexit_depth;
Denys Vlasenko5cc9bf62016-11-08 17:34:44 +01008756
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008757 if (G.flag_SIGINT)
8758 break;
Denys Vlasenko04b46bc2016-10-01 22:28:03 +02008759 if (G_flag_return_in_progress == 1)
8760 break;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008761
8762 IF_HAS_KEYWORDS(rword = pi->res_word;)
8763 debug_printf_exec(": rword=%d cond_code=%d last_rword=%d\n",
8764 rword, cond_code, last_rword);
Denys Vlasenko9fda6092017-07-14 13:36:48 +02008765
8766 sv_errexit_depth = G.errexit_depth;
Denys Vlasenko82d1c1f2017-12-31 17:30:02 +01008767 if (
8768#if ENABLE_HUSH_IF
8769 rword == RES_IF || rword == RES_ELIF ||
8770#endif
Denys Vlasenko9fda6092017-07-14 13:36:48 +02008771 pi->followup != PIPE_SEQ
8772 ) {
8773 G.errexit_depth++;
8774 }
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008775#if ENABLE_HUSH_LOOPS
8776 if ((rword == RES_WHILE || rword == RES_UNTIL || rword == RES_FOR)
8777 && loop_top == NULL /* avoid bumping G.depth_of_loop twice */
8778 ) {
8779 /* start of a loop: remember where loop starts */
8780 loop_top = pi;
8781 G.depth_of_loop++;
8782 }
8783#endif
8784 /* Still in the same "if...", "then..." or "do..." branch? */
8785 if (IF_HAS_KEYWORDS(rword == last_rword &&) 1) {
8786 if ((rcode == 0 && last_followup == PIPE_OR)
8787 || (rcode != 0 && last_followup == PIPE_AND)
8788 ) {
8789 /* It is "<true> || CMD" or "<false> && CMD"
8790 * and we should not execute CMD */
8791 debug_printf_exec("skipped cmd because of || or &&\n");
8792 last_followup = pi->followup;
Denys Vlasenko3beab832013-04-07 18:16:58 +02008793 goto dont_check_jobs_but_continue;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008794 }
8795 }
8796 last_followup = pi->followup;
8797 IF_HAS_KEYWORDS(last_rword = rword;)
8798#if ENABLE_HUSH_IF
8799 if (cond_code) {
8800 if (rword == RES_THEN) {
8801 /* if false; then ... fi has exitcode 0! */
8802 G.last_exitcode = rcode = EXIT_SUCCESS;
8803 /* "if <false> THEN cmd": skip cmd */
8804 continue;
8805 }
8806 } else {
8807 if (rword == RES_ELSE || rword == RES_ELIF) {
8808 /* "if <true> then ... ELSE/ELIF cmd":
8809 * skip cmd and all following ones */
8810 break;
8811 }
8812 }
8813#endif
8814#if ENABLE_HUSH_LOOPS
8815 if (rword == RES_FOR) { /* && pi->num_cmds - always == 1 */
8816 if (!for_lcur) {
8817 /* first loop through for */
8818
8819 static const char encoded_dollar_at[] ALIGN1 = {
8820 SPECIAL_VAR_SYMBOL, '@' | 0x80, SPECIAL_VAR_SYMBOL, '\0'
8821 }; /* encoded representation of "$@" */
8822 static const char *const encoded_dollar_at_argv[] = {
8823 encoded_dollar_at, NULL
8824 }; /* argv list with one element: "$@" */
8825 char **vals;
8826
8827 vals = (char**)encoded_dollar_at_argv;
8828 if (pi->next->res_word == RES_IN) {
8829 /* if no variable values after "in" we skip "for" */
8830 if (!pi->next->cmds[0].argv) {
8831 G.last_exitcode = rcode = EXIT_SUCCESS;
8832 debug_printf_exec(": null FOR: exitcode EXIT_SUCCESS\n");
8833 break;
8834 }
8835 vals = pi->next->cmds[0].argv;
8836 } /* else: "for var; do..." -> assume "$@" list */
8837 /* create list of variable values */
8838 debug_print_strings("for_list made from", vals);
8839 for_list = expand_strvec_to_strvec(vals);
8840 for_lcur = for_list;
8841 debug_print_strings("for_list", for_list);
8842 }
8843 if (!*for_lcur) {
8844 /* "for" loop is over, clean up */
8845 free(for_list);
8846 for_list = NULL;
8847 for_lcur = NULL;
8848 break;
8849 }
8850 /* Insert next value from for_lcur */
8851 /* note: *for_lcur already has quotes removed, $var expanded, etc */
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02008852 set_local_var(xasprintf("%s=%s", pi->cmds[0].argv[0], *for_lcur++), /*flag:*/ 0);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008853 continue;
8854 }
8855 if (rword == RES_IN) {
8856 continue; /* "for v IN list;..." - "in" has no cmds anyway */
8857 }
8858 if (rword == RES_DONE) {
8859 continue; /* "done" has no cmds too */
8860 }
8861#endif
8862#if ENABLE_HUSH_CASE
8863 if (rword == RES_CASE) {
Denys Vlasenkoaeaee432016-11-04 20:14:04 +01008864 debug_printf_exec("CASE cond_code:%d\n", cond_code);
Denys Vlasenkoabf75562018-04-02 17:25:18 +02008865 case_word = expand_string_to_string(pi->cmds->argv[0], 1);
8866 debug_printf_exec("CASE word1:'%s'\n", case_word);
8867 //unbackslash(case_word);
8868 //debug_printf_exec("CASE word2:'%s'\n", case_word);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008869 continue;
8870 }
8871 if (rword == RES_MATCH) {
8872 char **argv;
8873
Denys Vlasenkoaeaee432016-11-04 20:14:04 +01008874 debug_printf_exec("MATCH cond_code:%d\n", cond_code);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008875 if (!case_word) /* "case ... matched_word) ... WORD)": we executed selected branch, stop */
8876 break;
8877 /* all prev words didn't match, does this one match? */
8878 argv = pi->cmds->argv;
8879 while (*argv) {
Denys Vlasenkobd43c672017-07-05 23:12:15 +02008880 char *pattern = expand_string_to_string(*argv, /*unbackslash:*/ 0);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008881 /* TODO: which FNM_xxx flags to use? */
8882 cond_code = (fnmatch(pattern, case_word, /*flags:*/ 0) != 0);
Denys Vlasenkobd43c672017-07-05 23:12:15 +02008883 debug_printf_exec("fnmatch(pattern:'%s',str:'%s'):%d\n", pattern, case_word, cond_code);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008884 free(pattern);
8885 if (cond_code == 0) { /* match! we will execute this branch */
Denys Vlasenkoaeaee432016-11-04 20:14:04 +01008886 free(case_word);
8887 case_word = NULL; /* make future "word)" stop */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008888 break;
8889 }
8890 argv++;
8891 }
8892 continue;
8893 }
8894 if (rword == RES_CASE_BODY) { /* inside of a case branch */
Denys Vlasenkoaeaee432016-11-04 20:14:04 +01008895 debug_printf_exec("CASE_BODY cond_code:%d\n", cond_code);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008896 if (cond_code != 0)
8897 continue; /* not matched yet, skip this pipe */
8898 }
Denys Vlasenkoaeaee432016-11-04 20:14:04 +01008899 if (rword == RES_ESAC) {
8900 debug_printf_exec("ESAC cond_code:%d\n", cond_code);
8901 if (case_word) {
8902 /* "case" did not match anything: still set $? (to 0) */
8903 G.last_exitcode = rcode = EXIT_SUCCESS;
8904 }
8905 }
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008906#endif
8907 /* Just pressing <enter> in shell should check for jobs.
8908 * OTOH, in non-interactive shell this is useless
8909 * and only leads to extra job checks */
8910 if (pi->num_cmds == 0) {
8911 if (G_interactive_fd)
8912 goto check_jobs_and_continue;
8913 continue;
8914 }
8915
8916 /* After analyzing all keywords and conditions, we decided
8917 * to execute this pipe. NB: have to do checkjobs(NULL)
8918 * after run_pipe to collect any background children,
8919 * even if list execution is to be stopped. */
8920 debug_printf_exec(": run_pipe with %d members\n", pi->num_cmds);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008921#if ENABLE_HUSH_LOOPS
Denys Vlasenko5cc9bf62016-11-08 17:34:44 +01008922 G.flag_break_continue = 0;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008923#endif
Denys Vlasenko5cc9bf62016-11-08 17:34:44 +01008924 rcode = r = run_pipe(pi); /* NB: rcode is a smalluint, r is int */
8925 if (r != -1) {
8926 /* We ran a builtin, function, or group.
8927 * rcode is already known
8928 * and we don't need to wait for anything. */
8929 debug_printf_exec(": builtin/func exitcode %d\n", rcode);
8930 G.last_exitcode = rcode;
8931 check_and_run_traps();
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008932#if ENABLE_HUSH_LOOPS
Denys Vlasenko5cc9bf62016-11-08 17:34:44 +01008933 /* Was it "break" or "continue"? */
8934 if (G.flag_break_continue) {
8935 smallint fbc = G.flag_break_continue;
8936 /* We might fall into outer *loop*,
8937 * don't want to break it too */
8938 if (loop_top) {
8939 G.depth_break_continue--;
8940 if (G.depth_break_continue == 0)
8941 G.flag_break_continue = 0;
8942 /* else: e.g. "continue 2" should *break* once, *then* continue */
8943 } /* else: "while... do... { we are here (innermost list is not a loop!) };...done" */
8944 if (G.depth_break_continue != 0 || fbc == BC_BREAK) {
Denys Vlasenko7e675362016-10-28 21:57:31 +02008945 checkjobs(NULL, 0 /*(no pid to wait for)*/);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008946 break;
8947 }
Denys Vlasenko5cc9bf62016-11-08 17:34:44 +01008948 /* "continue": simulate end of loop */
8949 rword = RES_DONE;
8950 continue;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008951 }
Denys Vlasenko5cc9bf62016-11-08 17:34:44 +01008952#endif
8953 if (G_flag_return_in_progress == 1) {
8954 checkjobs(NULL, 0 /*(no pid to wait for)*/);
8955 break;
8956 }
8957 } else if (pi->followup == PIPE_BG) {
8958 /* What does bash do with attempts to background builtins? */
8959 /* even bash 3.2 doesn't do that well with nested bg:
8960 * try "{ { sleep 10; echo DEEP; } & echo HERE; } &".
8961 * I'm NOT treating inner &'s as jobs */
8962#if ENABLE_HUSH_JOB
8963 if (G.run_list_level == 1)
Denys Vlasenko16096292017-07-10 10:00:28 +02008964 insert_job_into_table(pi);
Denys Vlasenko5cc9bf62016-11-08 17:34:44 +01008965#endif
8966 /* Last command's pid goes to $! */
8967 G.last_bg_pid = pi->cmds[pi->num_cmds - 1].pid;
Denys Vlasenko840a4352017-07-07 22:56:02 +02008968 G.last_bg_pid_exitcode = 0;
Denys Vlasenko5cc9bf62016-11-08 17:34:44 +01008969 debug_printf_exec(": cmd&: exitcode EXIT_SUCCESS\n");
Denys Vlasenko7c40ddd2017-08-02 16:37:39 +02008970/* Check pi->pi_inverted? "! sleep 1 & echo $?": bash says 1. dash and ash say 0 */
Denys Vlasenko6c635d62016-11-08 20:26:11 +01008971 rcode = EXIT_SUCCESS;
8972 goto check_traps;
Denys Vlasenko5cc9bf62016-11-08 17:34:44 +01008973 } else {
8974#if ENABLE_HUSH_JOB
8975 if (G.run_list_level == 1 && G_interactive_fd) {
8976 /* Waits for completion, then fg's main shell */
8977 rcode = checkjobs_and_fg_shell(pi);
8978 debug_printf_exec(": checkjobs_and_fg_shell exitcode %d\n", rcode);
Denys Vlasenko6c635d62016-11-08 20:26:11 +01008979 goto check_traps;
Denys Vlasenko5cc9bf62016-11-08 17:34:44 +01008980 }
Denys Vlasenko6c635d62016-11-08 20:26:11 +01008981#endif
8982 /* This one just waits for completion */
8983 rcode = checkjobs(pi, 0 /*(no pid to wait for)*/);
8984 debug_printf_exec(": checkjobs exitcode %d\n", rcode);
8985 check_traps:
Denys Vlasenko5cc9bf62016-11-08 17:34:44 +01008986 G.last_exitcode = rcode;
8987 check_and_run_traps();
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008988 }
8989
Denys Vlasenko9fda6092017-07-14 13:36:48 +02008990 /* Handle "set -e" */
8991 if (rcode != 0 && G.o_opt[OPT_O_ERREXIT]) {
8992 debug_printf_exec("ERREXIT:1 errexit_depth:%d\n", G.errexit_depth);
8993 if (G.errexit_depth == 0)
8994 hush_exit(rcode);
8995 }
8996 G.errexit_depth = sv_errexit_depth;
8997
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008998 /* Analyze how result affects subsequent commands */
8999#if ENABLE_HUSH_IF
9000 if (rword == RES_IF || rword == RES_ELIF)
9001 cond_code = rcode;
9002#endif
Denys Vlasenko3beab832013-04-07 18:16:58 +02009003 check_jobs_and_continue:
Denys Vlasenko7e675362016-10-28 21:57:31 +02009004 checkjobs(NULL, 0 /*(no pid to wait for)*/);
Denys Vlasenko3beab832013-04-07 18:16:58 +02009005 dont_check_jobs_but_continue: ;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02009006#if ENABLE_HUSH_LOOPS
9007 /* Beware of "while false; true; do ..."! */
Denys Vlasenko00ae9892011-05-31 17:35:45 +02009008 if (pi->next
9009 && (pi->next->res_word == RES_DO || pi->next->res_word == RES_DONE)
Denys Vlasenko56a3b822011-06-01 12:47:07 +02009010 /* check for RES_DONE is needed for "while ...; do \n done" case */
Denys Vlasenko00ae9892011-05-31 17:35:45 +02009011 ) {
Denys Vlasenkob36abf22010-09-05 14:50:59 +02009012 if (rword == RES_WHILE) {
9013 if (rcode) {
9014 /* "while false; do...done" - exitcode 0 */
9015 G.last_exitcode = rcode = EXIT_SUCCESS;
9016 debug_printf_exec(": while expr is false: breaking (exitcode:EXIT_SUCCESS)\n");
Denys Vlasenko3beab832013-04-07 18:16:58 +02009017 break;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02009018 }
9019 }
9020 if (rword == RES_UNTIL) {
9021 if (!rcode) {
9022 debug_printf_exec(": until expr is true: breaking\n");
Denys Vlasenkob36abf22010-09-05 14:50:59 +02009023 break;
9024 }
9025 }
9026 }
9027#endif
Denys Vlasenkob36abf22010-09-05 14:50:59 +02009028 } /* for (pi) */
9029
9030#if ENABLE_HUSH_JOB
9031 G.run_list_level--;
9032#endif
9033#if ENABLE_HUSH_LOOPS
9034 if (loop_top)
9035 G.depth_of_loop--;
9036 free(for_list);
9037#endif
9038#if ENABLE_HUSH_CASE
9039 free(case_word);
9040#endif
9041 debug_leave();
9042 debug_printf_exec("run_list lvl %d return %d\n", G.run_list_level + 1, rcode);
9043 return rcode;
9044}
9045
9046/* Select which version we will use */
9047static int run_and_free_list(struct pipe *pi)
9048{
9049 int rcode = 0;
9050 debug_printf_exec("run_and_free_list entered\n");
Dan Fandrich85c62472010-11-20 13:05:17 -08009051 if (!G.o_opt[OPT_O_NOEXEC]) {
Denys Vlasenkob36abf22010-09-05 14:50:59 +02009052 debug_printf_exec(": run_list: 1st pipe with %d cmds\n", pi->num_cmds);
9053 rcode = run_list(pi);
9054 }
9055 /* free_pipe_list has the side effect of clearing memory.
9056 * In the long run that function can be merged with run_list,
9057 * but doing that now would hobble the debugging effort. */
9058 free_pipe_list(pi);
9059 debug_printf_exec("run_and_free_list return %d\n", rcode);
9060 return rcode;
9061}
9062
9063
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02009064static void install_sighandlers(unsigned mask)
Eric Andersen52a97ca2001-06-22 06:49:26 +00009065{
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02009066 sighandler_t old_handler;
9067 unsigned sig = 0;
9068 while ((mask >>= 1) != 0) {
9069 sig++;
9070 if (!(mask & 1))
9071 continue;
Denys Vlasenko0806e402011-05-12 23:06:20 +02009072 old_handler = install_sighandler(sig, pick_sighandler(sig));
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02009073 /* POSIX allows shell to re-enable SIGCHLD
9074 * even if it was SIG_IGN on entry.
9075 * Therefore we skip IGN check for it:
9076 */
9077 if (sig == SIGCHLD)
9078 continue;
Denys Vlasenko49e6bf22017-08-04 14:28:16 +02009079 /* bash re-enables SIGHUP which is SIG_IGNed on entry.
9080 * Try: "trap '' HUP; bash; echo RET" and type "kill -HUP $$"
9081 */
9082 //if (sig == SIGHUP) continue; - TODO?
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02009083 if (old_handler == SIG_IGN) {
9084 /* oops... restore back to IGN, and record this fact */
Denys Vlasenko0806e402011-05-12 23:06:20 +02009085 install_sighandler(sig, old_handler);
Denys Vlasenko7a85c602017-01-08 17:40:18 +01009086#if ENABLE_HUSH_TRAP
9087 if (!G_traps)
9088 G_traps = xzalloc(sizeof(G_traps[0]) * NSIG);
9089 free(G_traps[sig]);
9090 G_traps[sig] = xzalloc(1); /* == xstrdup(""); */
9091#endif
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02009092 }
9093 }
9094}
9095
9096/* Called a few times only (or even once if "sh -c") */
9097static void install_special_sighandlers(void)
9098{
Denis Vlasenkof9375282009-04-05 19:13:39 +00009099 unsigned mask;
Denys Vlasenkoe89a2412010-01-12 15:19:31 +01009100
Denys Vlasenko54e9e122011-05-09 00:52:15 +02009101 /* Which signals are shell-special? */
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02009102 mask = (1 << SIGQUIT) | (1 << SIGCHLD);
Denys Vlasenko54e9e122011-05-09 00:52:15 +02009103 if (G_interactive_fd) {
9104 mask |= SPECIAL_INTERACTIVE_SIGS;
9105 if (G_saved_tty_pgrp) /* we have ctty, job control sigs work */
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02009106 mask |= SPECIAL_JOBSTOP_SIGS;
Denys Vlasenko54e9e122011-05-09 00:52:15 +02009107 }
Denys Vlasenkof58f7052011-05-12 02:10:33 +02009108 /* Careful, do not re-install handlers we already installed */
9109 if (G.special_sig_mask != mask) {
9110 unsigned diff = mask & ~G.special_sig_mask;
9111 G.special_sig_mask = mask;
9112 install_sighandlers(diff);
9113 }
Denis Vlasenkof9375282009-04-05 19:13:39 +00009114}
9115
9116#if ENABLE_HUSH_JOB
9117/* helper */
Denys Vlasenko54e9e122011-05-09 00:52:15 +02009118/* Set handlers to restore tty pgrp and exit */
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02009119static void install_fatal_sighandlers(void)
Denis Vlasenkof9375282009-04-05 19:13:39 +00009120{
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02009121 unsigned mask;
Denys Vlasenko54e9e122011-05-09 00:52:15 +02009122
9123 /* We will restore tty pgrp on these signals */
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02009124 mask = 0
Denys Vlasenko830ea352016-11-08 04:59:11 +01009125 /*+ (1 << SIGILL ) * HUSH_DEBUG*/
9126 /*+ (1 << SIGFPE ) * HUSH_DEBUG*/
Denys Vlasenko54e9e122011-05-09 00:52:15 +02009127 + (1 << SIGBUS ) * HUSH_DEBUG
9128 + (1 << SIGSEGV) * HUSH_DEBUG
Denys Vlasenko830ea352016-11-08 04:59:11 +01009129 /*+ (1 << SIGTRAP) * HUSH_DEBUG*/
Denys Vlasenko54e9e122011-05-09 00:52:15 +02009130 + (1 << SIGABRT)
9131 /* bash 3.2 seems to handle these just like 'fatal' ones */
9132 + (1 << SIGPIPE)
9133 + (1 << SIGALRM)
Denys Vlasenkof58f7052011-05-12 02:10:33 +02009134 /* if we are interactive, SIGHUP, SIGTERM and SIGINT are special sigs.
Denys Vlasenko54e9e122011-05-09 00:52:15 +02009135 * if we aren't interactive... but in this case
Denys Vlasenkof58f7052011-05-12 02:10:33 +02009136 * we never want to restore pgrp on exit, and this fn is not called
9137 */
Denys Vlasenko54e9e122011-05-09 00:52:15 +02009138 /*+ (1 << SIGHUP )*/
9139 /*+ (1 << SIGTERM)*/
9140 /*+ (1 << SIGINT )*/
9141 ;
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02009142 G_fatal_sig_mask = mask;
Denys Vlasenko54e9e122011-05-09 00:52:15 +02009143
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02009144 install_sighandlers(mask);
Denis Vlasenkof9375282009-04-05 19:13:39 +00009145}
Denis Vlasenkob81b3df2007-04-28 16:48:04 +00009146#endif
Eric Andersenada18ff2001-05-21 16:18:22 +00009147
Denys Vlasenko6696eac2010-11-14 02:01:50 +01009148static int set_mode(int state, char mode, const char *o_opt)
Denis Vlasenkod5762932009-03-31 11:22:57 +00009149{
Denys Vlasenko6696eac2010-11-14 02:01:50 +01009150 int idx;
Denis Vlasenkod5762932009-03-31 11:22:57 +00009151 switch (mode) {
Denys Vlasenko6696eac2010-11-14 02:01:50 +01009152 case 'n':
Dan Fandrich85c62472010-11-20 13:05:17 -08009153 G.o_opt[OPT_O_NOEXEC] = state;
Denys Vlasenko6696eac2010-11-14 02:01:50 +01009154 break;
9155 case 'x':
9156 IF_HUSH_MODE_X(G_x_mode = state;)
9157 break;
9158 case 'o':
9159 if (!o_opt) {
9160 /* "set -+o" without parameter.
9161 * in bash, set -o produces this output:
9162 * pipefail off
9163 * and set +o:
9164 * set +o pipefail
9165 * We always use the second form.
9166 */
9167 const char *p = o_opt_strings;
9168 idx = 0;
9169 while (*p) {
9170 printf("set %co %s\n", (G.o_opt[idx] ? '-' : '+'), p);
9171 idx++;
9172 p += strlen(p) + 1;
9173 }
9174 break;
9175 }
9176 idx = index_in_strings(o_opt_strings, o_opt);
9177 if (idx >= 0) {
9178 G.o_opt[idx] = state;
9179 break;
9180 }
Denys Vlasenko9fda6092017-07-14 13:36:48 +02009181 case 'e':
9182 G.o_opt[OPT_O_ERREXIT] = state;
9183 break;
Denys Vlasenko6696eac2010-11-14 02:01:50 +01009184 default:
9185 return EXIT_FAILURE;
Denis Vlasenkod5762932009-03-31 11:22:57 +00009186 }
9187 return EXIT_SUCCESS;
9188}
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009189
Denis Vlasenko9b49a5e2007-10-11 10:05:36 +00009190int hush_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
Matt Kraai2d91deb2001-08-01 17:21:35 +00009191int hush_main(int argc, char **argv)
Eric Andersen25f27032001-04-26 23:22:31 +00009192{
Denys Vlasenkof58f7052011-05-12 02:10:33 +02009193 enum {
9194 OPT_login = (1 << 0),
Denys Vlasenkof2ed39b2018-04-05 16:46:49 +02009195 OPT_s = (1 << 1),
Denys Vlasenkof58f7052011-05-12 02:10:33 +02009196 };
9197 unsigned flags;
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02009198 unsigned builtin_argc;
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00009199 char **e;
Denis Vlasenkod76c0492007-05-25 02:16:25 +00009200 struct variable *cur_var;
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01009201 struct variable *shell_ver;
Eric Andersenbc604a22001-05-16 05:24:03 +00009202
Denis Vlasenko574f2f42008-02-27 18:41:59 +00009203 INIT_G();
Denys Vlasenko10c01312011-05-11 11:49:21 +02009204 if (EXIT_SUCCESS != 0) /* if EXIT_SUCCESS == 0, it is already done */
Denis Vlasenkoab2b0642009-04-06 18:42:11 +00009205 G.last_exitcode = EXIT_SUCCESS;
Denys Vlasenkoe9abe752016-08-19 20:15:26 +02009206
Denys Vlasenko10c01312011-05-11 11:49:21 +02009207#if ENABLE_HUSH_FAST
9208 G.count_SIGCHLD++; /* ensure it is != G.handled_SIGCHLD */
9209#endif
Denis Vlasenko46f9b6d2009-04-05 10:39:03 +00009210#if !BB_MMU
9211 G.argv0_for_re_execing = argv[0];
9212#endif
Denys Vlasenko6aad1dd2018-01-19 15:37:04 +01009213
Denis Vlasenko0a83fc32007-05-25 11:12:32 +00009214 /* Deal with HUSH_VERSION */
Denys Vlasenko6aad1dd2018-01-19 15:37:04 +01009215 debug_printf_env("unsetenv '%s'\n", "HUSH_VERSION");
9216 unsetenv("HUSH_VERSION"); /* in case it exists in initial env */
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01009217 shell_ver = xzalloc(sizeof(*shell_ver));
9218 shell_ver->flg_export = 1;
9219 shell_ver->flg_read_only = 1;
Denys Vlasenko4f870492010-09-10 11:06:01 +02009220 /* Code which handles ${var<op>...} needs writable values for all variables,
Denys Vlasenko36f774a2010-09-05 14:45:38 +02009221 * therefore we xstrdup: */
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01009222 shell_ver->varstr = xstrdup(hush_version_str);
Denys Vlasenko6aad1dd2018-01-19 15:37:04 +01009223
Denys Vlasenko605067b2010-09-06 12:10:51 +02009224 /* Create shell local variables from the values
9225 * currently living in the environment */
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01009226 G.top_var = shell_ver;
Denis Vlasenko87a86552008-07-29 19:43:10 +00009227 cur_var = G.top_var;
Denis Vlasenko0a83fc32007-05-25 11:12:32 +00009228 e = environ;
Denis Vlasenkod76c0492007-05-25 02:16:25 +00009229 if (e) while (*e) {
9230 char *value = strchr(*e, '=');
9231 if (value) { /* paranoia */
9232 cur_var->next = xzalloc(sizeof(*cur_var));
9233 cur_var = cur_var->next;
Denis Vlasenko28c0f0f2007-05-25 02:46:01 +00009234 cur_var->varstr = *e;
Denis Vlasenkod76c0492007-05-25 02:16:25 +00009235 cur_var->max_len = strlen(*e);
9236 cur_var->flg_export = 1;
9237 }
9238 e++;
9239 }
Denys Vlasenko605067b2010-09-06 12:10:51 +02009240 /* (Re)insert HUSH_VERSION into env (AFTER we scanned the env!) */
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01009241 debug_printf_env("putenv '%s'\n", shell_ver->varstr);
9242 putenv(shell_ver->varstr);
Denys Vlasenko6db47842009-09-05 20:15:17 +02009243
9244 /* Export PWD */
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02009245 set_pwd_var(SETFLAG_EXPORT);
Denys Vlasenko3fa97af2014-04-15 11:43:29 +02009246
Denys Vlasenkof5018da2018-04-06 17:58:21 +02009247#if ENABLE_HUSH_INTERACTIVE && ENABLE_FEATURE_EDITING_FANCY_PROMPT
9248 /* Set (but not export) PS1/2 unless already set */
9249 if (!get_local_var_value("PS1"))
9250 set_local_var_from_halves("PS1", "\\w \\$ ");
9251 if (!get_local_var_value("PS2"))
9252 set_local_var_from_halves("PS2", "> ");
9253#endif
9254
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01009255#if BASH_HOSTNAME_VAR
Denys Vlasenko3fa97af2014-04-15 11:43:29 +02009256 /* Set (but not export) HOSTNAME unless already set */
9257 if (!get_local_var_value("HOSTNAME")) {
9258 struct utsname uts;
9259 uname(&uts);
9260 set_local_var_from_halves("HOSTNAME", uts.nodename);
9261 }
Denys Vlasenko6db47842009-09-05 20:15:17 +02009262 /* bash also exports SHLVL and _,
9263 * and sets (but doesn't export) the following variables:
9264 * BASH=/bin/bash
9265 * BASH_VERSINFO=([0]="3" [1]="2" [2]="0" [3]="1" [4]="release" [5]="i386-pc-linux-gnu")
9266 * BASH_VERSION='3.2.0(1)-release'
9267 * HOSTTYPE=i386
9268 * MACHTYPE=i386-pc-linux-gnu
9269 * OSTYPE=linux-gnu
Denys Vlasenkodea47882009-10-09 15:40:49 +02009270 * PPID=<NNNNN> - we also do it elsewhere
Denys Vlasenko6db47842009-09-05 20:15:17 +02009271 * EUID=<NNNNN>
9272 * UID=<NNNNN>
9273 * GROUPS=()
9274 * LINES=<NNN>
9275 * COLUMNS=<NNN>
9276 * BASH_ARGC=()
9277 * BASH_ARGV=()
9278 * BASH_LINENO=()
9279 * BASH_SOURCE=()
9280 * DIRSTACK=()
9281 * PIPESTATUS=([0]="0")
9282 * HISTFILE=/<xxx>/.bash_history
9283 * HISTFILESIZE=500
9284 * HISTSIZE=500
9285 * MAILCHECK=60
9286 * PATH=/usr/gnu/bin:/usr/local/bin:/bin:/usr/bin:.
9287 * SHELL=/bin/bash
9288 * SHELLOPTS=braceexpand:emacs:hashall:histexpand:history:interactive-comments:monitor
9289 * TERM=dumb
9290 * OPTERR=1
9291 * OPTIND=1
9292 * IFS=$' \t\n'
Denys Vlasenko6db47842009-09-05 20:15:17 +02009293 * PS4='+ '
9294 */
Denys Vlasenko3fa97af2014-04-15 11:43:29 +02009295#endif
Denys Vlasenko6db47842009-09-05 20:15:17 +02009296
Denys Vlasenko5807e182018-02-08 19:19:04 +01009297#if ENABLE_HUSH_LINENO_VAR
9298 if (ENABLE_HUSH_LINENO_VAR) {
Denys Vlasenko6aad1dd2018-01-19 15:37:04 +01009299 char *p = xasprintf("LINENO=%*s", (int)(sizeof(int)*3), "");
9300 set_local_var(p, /*flags*/ 0);
9301 G.lineno_var = p; /* can't assign before set_local_var("LINENO=...") */
9302 }
9303#endif
9304
Denis Vlasenko38f63192007-01-22 09:03:07 +00009305#if ENABLE_FEATURE_EDITING
Denys Vlasenkoe45af7a2011-09-04 16:15:24 +02009306 G.line_input_state = new_line_input_t(FOR_SHELL);
Denis Vlasenko8e1c7152007-01-22 07:21:38 +00009307#endif
Denys Vlasenko99862cb2010-09-12 17:34:13 +02009308
Eric Andersen94ac2442001-05-22 19:05:18 +00009309 /* Initialize some more globals to non-zero values */
Mike Frysinger67c1c7b2009-04-24 06:26:18 +00009310 cmdedit_update_prompt();
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +00009311
Denys Vlasenkoe9abe752016-08-19 20:15:26 +02009312 die_func = restore_ttypgrp_and__exit;
Denis Vlasenkoed782372009-04-10 00:45:02 +00009313
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00009314 /* Shell is non-interactive at first. We need to call
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02009315 * install_special_sighandlers() if we are going to execute "sh <script>",
Denis Vlasenkod3f973e2009-04-06 10:21:42 +00009316 * "sh -c <cmds>" or login shell's /etc/profile and friends.
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02009317 * If we later decide that we are interactive, we run install_special_sighandlers()
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00009318 * in order to intercept (more) signals.
9319 */
9320
9321 /* Parse options */
Mike Frysinger19a7ea12009-03-28 13:02:11 +00009322 /* http://www.opengroup.org/onlinepubs/9699919799/utilities/sh.html */
Denys Vlasenkof58f7052011-05-12 02:10:33 +02009323 flags = (argv[0] && argv[0][0] == '-') ? OPT_login : 0;
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02009324 builtin_argc = 0;
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00009325 while (1) {
Denys Vlasenkof2ed39b2018-04-05 16:46:49 +02009326 int opt = getopt(argc, argv, "+c:exinsl"
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00009327#if !BB_MMU
Denis Vlasenkobc569742009-04-12 20:35:19 +00009328 "<:$:R:V:"
9329# if ENABLE_HUSH_FUNCTIONS
9330 "F:"
9331# endif
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00009332#endif
9333 );
9334 if (opt <= 0)
9335 break;
Eric Andersen25f27032001-04-26 23:22:31 +00009336 switch (opt) {
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00009337 case 'c':
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02009338 /* Possibilities:
9339 * sh ... -c 'script'
9340 * sh ... -c 'script' ARG0 [ARG1...]
9341 * On NOMMU, if builtin_argc != 0,
Denys Vlasenko17323a62010-01-28 01:57:05 +01009342 * sh ... -c 'builtin' BARGV... "" ARG0 [ARG1...]
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02009343 * "" needs to be replaced with NULL
9344 * and BARGV vector fed to builtin function.
Denys Vlasenko17323a62010-01-28 01:57:05 +01009345 * Note: the form without ARG0 never happens:
9346 * sh ... -c 'builtin' BARGV... ""
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02009347 */
Denys Vlasenkodea47882009-10-09 15:40:49 +02009348 if (!G.root_pid) {
Denis Vlasenko46f9b6d2009-04-05 10:39:03 +00009349 G.root_pid = getpid();
Denys Vlasenkodea47882009-10-09 15:40:49 +02009350 G.root_ppid = getppid();
9351 }
Denis Vlasenko87a86552008-07-29 19:43:10 +00009352 G.global_argv = argv + optind;
9353 G.global_argc = argc - optind;
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02009354 if (builtin_argc) {
9355 /* -c 'builtin' [BARGV...] "" ARG0 [ARG1...] */
9356 const struct built_in_command *x;
9357
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02009358 install_special_sighandlers();
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02009359 x = find_builtin(optarg);
9360 if (x) { /* paranoia */
9361 G.global_argc -= builtin_argc; /* skip [BARGV...] "" */
9362 G.global_argv += builtin_argc;
9363 G.global_argv[-1] = NULL; /* replace "" */
Denys Vlasenko8ee2ada2011-02-07 02:03:51 +01009364 fflush_all();
Denys Vlasenko17323a62010-01-28 01:57:05 +01009365 G.last_exitcode = x->b_function(argv + optind - 1);
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02009366 }
9367 goto final_return;
9368 }
9369 if (!G.global_argv[0]) {
9370 /* -c 'script' (no params): prevent empty $0 */
9371 G.global_argv--; /* points to argv[i] of 'script' */
9372 G.global_argv[0] = argv[0];
Denys Vlasenko5ae8f1c2010-05-22 06:32:11 +02009373 G.global_argc++;
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02009374 } /* else -c 'script' ARG0 [ARG1...]: $0 is ARG0 */
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02009375 install_special_sighandlers();
Denis Vlasenkob6e65562009-04-03 16:49:04 +00009376 parse_and_run_string(optarg);
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00009377 goto final_return;
9378 case 'i':
Denis Vlasenkoc666f712007-05-16 22:18:54 +00009379 /* Well, we cannot just declare interactiveness,
9380 * we have to have some stuff (ctty, etc) */
Denis Vlasenko60b392f2009-04-03 19:14:32 +00009381 /* G_interactive_fd++; */
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00009382 break;
Mike Frysinger19a7ea12009-03-28 13:02:11 +00009383 case 's':
Denys Vlasenkof2ed39b2018-04-05 16:46:49 +02009384 flags |= OPT_s;
Mike Frysinger19a7ea12009-03-28 13:02:11 +00009385 break;
Denys Vlasenkof58f7052011-05-12 02:10:33 +02009386 case 'l':
9387 flags |= OPT_login;
9388 break;
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00009389#if !BB_MMU
Denis Vlasenko50f3aa42009-04-07 10:52:40 +00009390 case '<': /* "big heredoc" support */
Denys Vlasenko729ecb82010-06-07 14:14:26 +02009391 full_write1_str(optarg);
Denis Vlasenko50f3aa42009-04-07 10:52:40 +00009392 _exit(0);
Denys Vlasenkoe89a2412010-01-12 15:19:31 +01009393 case '$': {
9394 unsigned long long empty_trap_mask;
9395
Denis Vlasenko34e573d2009-04-06 12:56:28 +00009396 G.root_pid = bb_strtou(optarg, &optarg, 16);
9397 optarg++;
Denys Vlasenkodea47882009-10-09 15:40:49 +02009398 G.root_ppid = bb_strtou(optarg, &optarg, 16);
9399 optarg++;
Denis Vlasenko34e573d2009-04-06 12:56:28 +00009400 G.last_bg_pid = bb_strtou(optarg, &optarg, 16);
9401 optarg++;
Denis Vlasenkoab2b0642009-04-06 18:42:11 +00009402 G.last_exitcode = bb_strtou(optarg, &optarg, 16);
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02009403 optarg++;
9404 builtin_argc = bb_strtou(optarg, &optarg, 16);
Denys Vlasenkoe89a2412010-01-12 15:19:31 +01009405 optarg++;
9406 empty_trap_mask = bb_strtoull(optarg, &optarg, 16);
9407 if (empty_trap_mask != 0) {
Denys Vlasenko4ee824f2017-07-03 01:22:13 +02009408 IF_HUSH_TRAP(int sig;)
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02009409 install_special_sighandlers();
Denys Vlasenko4ee824f2017-07-03 01:22:13 +02009410# if ENABLE_HUSH_TRAP
Denys Vlasenko7a85c602017-01-08 17:40:18 +01009411 G_traps = xzalloc(sizeof(G_traps[0]) * NSIG);
Denys Vlasenkoe89a2412010-01-12 15:19:31 +01009412 for (sig = 1; sig < NSIG; sig++) {
9413 if (empty_trap_mask & (1LL << sig)) {
Denys Vlasenko7a85c602017-01-08 17:40:18 +01009414 G_traps[sig] = xzalloc(1); /* == xstrdup(""); */
Denys Vlasenko0806e402011-05-12 23:06:20 +02009415 install_sighandler(sig, SIG_IGN);
Denys Vlasenkoe89a2412010-01-12 15:19:31 +01009416 }
9417 }
Denys Vlasenko4ee824f2017-07-03 01:22:13 +02009418# endif
Denys Vlasenkoe89a2412010-01-12 15:19:31 +01009419 }
Denis Vlasenkod3f973e2009-04-06 10:21:42 +00009420# if ENABLE_HUSH_LOOPS
Denis Vlasenko34e573d2009-04-06 12:56:28 +00009421 optarg++;
9422 G.depth_of_loop = bb_strtou(optarg, &optarg, 16);
Denis Vlasenkod3f973e2009-04-06 10:21:42 +00009423# endif
Denys Vlasenkoeb0de052018-04-09 17:54:07 +02009424# if ENABLE_HUSH_FUNCTIONS
9425 /* nommu uses re-exec trick for "... | func | ...",
9426 * should allow "return".
9427 * This accidentally allows returns in subshells.
9428 */
9429 G_flag_return_in_progress = -1;
9430# endif
Denis Vlasenko34e573d2009-04-06 12:56:28 +00009431 break;
Denys Vlasenkoe89a2412010-01-12 15:19:31 +01009432 }
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00009433 case 'R':
9434 case 'V':
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02009435 set_local_var(xstrdup(optarg), opt == 'R' ? SETFLAG_MAKE_RO : 0);
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00009436 break;
Denis Vlasenkobc569742009-04-12 20:35:19 +00009437# if ENABLE_HUSH_FUNCTIONS
9438 case 'F': {
9439 struct function *funcp = new_function(optarg);
9440 /* funcp->name is already set to optarg */
9441 /* funcp->body is set to NULL. It's a special case. */
9442 funcp->body_as_string = argv[optind];
9443 optind++;
9444 break;
9445 }
9446# endif
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00009447#endif
Mike Frysingerad88d5a2009-03-28 13:44:51 +00009448 case 'n':
9449 case 'x':
Denys Vlasenko9fda6092017-07-14 13:36:48 +02009450 case 'e':
Denys Vlasenko6696eac2010-11-14 02:01:50 +01009451 if (set_mode(1, opt, NULL) == 0) /* no error */
Mike Frysingerad88d5a2009-03-28 13:44:51 +00009452 break;
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00009453 default:
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00009454#ifndef BB_VER
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00009455 fprintf(stderr, "Usage: sh [FILE]...\n"
9456 " or: sh -c command [args]...\n\n");
9457 exit(EXIT_FAILURE);
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00009458#else
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00009459 bb_show_usage();
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00009460#endif
Eric Andersen25f27032001-04-26 23:22:31 +00009461 }
Denis Vlasenkof9375282009-04-05 19:13:39 +00009462 } /* option parsing loop */
Denis Vlasenko46f9b6d2009-04-05 10:39:03 +00009463
Denys Vlasenkof58f7052011-05-12 02:10:33 +02009464 /* Skip options. Try "hush -l": $1 should not be "-l"! */
9465 G.global_argc = argc - (optind - 1);
9466 G.global_argv = argv + (optind - 1);
9467 G.global_argv[0] = argv[0];
9468
Denys Vlasenkodea47882009-10-09 15:40:49 +02009469 if (!G.root_pid) {
Denis Vlasenko46f9b6d2009-04-05 10:39:03 +00009470 G.root_pid = getpid();
Denys Vlasenkodea47882009-10-09 15:40:49 +02009471 G.root_ppid = getppid();
9472 }
Denis Vlasenkof9375282009-04-05 19:13:39 +00009473
9474 /* If we are login shell... */
Denys Vlasenkof58f7052011-05-12 02:10:33 +02009475 if (flags & OPT_login) {
Denis Vlasenko46f9b6d2009-04-05 10:39:03 +00009476 FILE *input;
Denis Vlasenko46f9b6d2009-04-05 10:39:03 +00009477 debug_printf("sourcing /etc/profile\n");
9478 input = fopen_for_read("/etc/profile");
9479 if (input != NULL) {
Denys Vlasenko7b25b1c2016-08-20 15:58:34 +02009480 remember_FILE(input);
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02009481 install_special_sighandlers();
Denis Vlasenko46f9b6d2009-04-05 10:39:03 +00009482 parse_and_run_file(input);
Denys Vlasenko7b25b1c2016-08-20 15:58:34 +02009483 fclose_and_forget(input);
Denis Vlasenko46f9b6d2009-04-05 10:39:03 +00009484 }
Denis Vlasenkof9375282009-04-05 19:13:39 +00009485 /* bash: after sourcing /etc/profile,
9486 * tries to source (in the given order):
9487 * ~/.bash_profile, ~/.bash_login, ~/.profile,
Denys Vlasenko28a105d2009-06-01 11:26:30 +02009488 * stopping on first found. --noprofile turns this off.
Denis Vlasenkof9375282009-04-05 19:13:39 +00009489 * bash also sources ~/.bash_logout on exit.
9490 * If called as sh, skips .bash_XXX files.
9491 */
Denis Vlasenko46f9b6d2009-04-05 10:39:03 +00009492 }
9493
Denys Vlasenkof2ed39b2018-04-05 16:46:49 +02009494 /* -s is: hush -s ARGV1 ARGV2 (no SCRIPT) */
9495 if (!(flags & OPT_s) && G.global_argv[1]) {
Denis Vlasenkof9375282009-04-05 19:13:39 +00009496 FILE *input;
9497 /*
Denis Vlasenkod3f973e2009-04-06 10:21:42 +00009498 * "bash <script>" (which is never interactive (unless -i?))
9499 * sources $BASH_ENV here (without scanning $PATH).
Denis Vlasenkof9375282009-04-05 19:13:39 +00009500 * If called as sh, does the same but with $ENV.
Denys Vlasenko2eb0a7e2016-10-27 11:28:59 +02009501 * Also NB, per POSIX, $ENV should undergo parameter expansion.
Denis Vlasenkof9375282009-04-05 19:13:39 +00009502 */
Denys Vlasenkof58f7052011-05-12 02:10:33 +02009503 G.global_argc--;
9504 G.global_argv++;
9505 debug_printf("running script '%s'\n", G.global_argv[0]);
Denys Vlasenkob7adf7a2016-10-25 17:00:13 +02009506 xfunc_error_retval = 127; /* for "hush /does/not/exist" case */
Denys Vlasenkof58f7052011-05-12 02:10:33 +02009507 input = xfopen_for_read(G.global_argv[0]);
Denys Vlasenkob7adf7a2016-10-25 17:00:13 +02009508 xfunc_error_retval = 1;
Denys Vlasenko7b25b1c2016-08-20 15:58:34 +02009509 remember_FILE(input);
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02009510 install_special_sighandlers();
Denis Vlasenkof9375282009-04-05 19:13:39 +00009511 parse_and_run_file(input);
9512#if ENABLE_FEATURE_CLEAN_UP
Denys Vlasenko7b25b1c2016-08-20 15:58:34 +02009513 fclose_and_forget(input);
Denis Vlasenkof9375282009-04-05 19:13:39 +00009514#endif
9515 goto final_return;
9516 }
9517
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00009518 /* Up to here, shell was non-interactive. Now it may become one.
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02009519 * NB: don't forget to (re)run install_special_sighandlers() as needed.
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00009520 */
Denis Vlasenkof9375282009-04-05 19:13:39 +00009521
Denys Vlasenko28a105d2009-06-01 11:26:30 +02009522 /* A shell is interactive if the '-i' flag was given,
9523 * or if all of the following conditions are met:
Denis Vlasenko55b2de72007-04-18 17:21:28 +00009524 * no -c command
Eric Andersen25f27032001-04-26 23:22:31 +00009525 * no arguments remaining or the -s flag given
9526 * standard input is a terminal
9527 * standard output is a terminal
Denis Vlasenkof9375282009-04-05 19:13:39 +00009528 * Refer to Posix.2, the description of the 'sh' utility.
9529 */
9530#if ENABLE_HUSH_JOB
9531 if (isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)) {
Mike Frysinger38478a62009-05-20 04:48:06 -04009532 G_saved_tty_pgrp = tcgetpgrp(STDIN_FILENO);
9533 debug_printf("saved_tty_pgrp:%d\n", G_saved_tty_pgrp);
9534 if (G_saved_tty_pgrp < 0)
9535 G_saved_tty_pgrp = 0;
Denis Vlasenkoc8653f62009-04-27 23:29:14 +00009536
9537 /* try to dup stdin to high fd#, >= 255 */
Denys Vlasenko9acd63c2018-03-28 18:35:07 +02009538 G_interactive_fd = dup_CLOEXEC(STDIN_FILENO, 254);
Denis Vlasenkoc8653f62009-04-27 23:29:14 +00009539 if (G_interactive_fd < 0) {
9540 /* try to dup to any fd */
9541 G_interactive_fd = dup(STDIN_FILENO);
Denis Vlasenko60b392f2009-04-03 19:14:32 +00009542 if (G_interactive_fd < 0) {
Denis Vlasenkoc8653f62009-04-27 23:29:14 +00009543 /* give up */
9544 G_interactive_fd = 0;
Mike Frysinger38478a62009-05-20 04:48:06 -04009545 G_saved_tty_pgrp = 0;
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00009546 }
9547 }
Denis Vlasenkoc8653f62009-04-27 23:29:14 +00009548// TODO: track & disallow any attempts of user
9549// to (inadvertently) close/redirect G_interactive_fd
Eric Andersen25f27032001-04-26 23:22:31 +00009550 }
Denis Vlasenkof9375282009-04-05 19:13:39 +00009551 debug_printf("interactive_fd:%d\n", G_interactive_fd);
Denis Vlasenko60b392f2009-04-03 19:14:32 +00009552 if (G_interactive_fd) {
Denis Vlasenkof9375282009-04-05 19:13:39 +00009553 close_on_exec_on(G_interactive_fd);
Denis Vlasenkoc8653f62009-04-27 23:29:14 +00009554
Mike Frysinger38478a62009-05-20 04:48:06 -04009555 if (G_saved_tty_pgrp) {
Denis Vlasenkoc8653f62009-04-27 23:29:14 +00009556 /* If we were run as 'hush &', sleep until we are
9557 * in the foreground (tty pgrp == our pgrp).
9558 * If we get started under a job aware app (like bash),
9559 * make sure we are now in charge so we don't fight over
9560 * who gets the foreground */
9561 while (1) {
9562 pid_t shell_pgrp = getpgrp();
Mike Frysinger38478a62009-05-20 04:48:06 -04009563 G_saved_tty_pgrp = tcgetpgrp(G_interactive_fd);
9564 if (G_saved_tty_pgrp == shell_pgrp)
Denis Vlasenkoc8653f62009-04-27 23:29:14 +00009565 break;
9566 /* send TTIN to ourself (should stop us) */
9567 kill(- shell_pgrp, SIGTTIN);
9568 }
Denis Vlasenkof9375282009-04-05 19:13:39 +00009569 }
Denis Vlasenkoc8653f62009-04-27 23:29:14 +00009570
Denys Vlasenkof58f7052011-05-12 02:10:33 +02009571 /* Install more signal handlers */
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02009572 install_special_sighandlers();
Denis Vlasenkoc8653f62009-04-27 23:29:14 +00009573
Mike Frysinger38478a62009-05-20 04:48:06 -04009574 if (G_saved_tty_pgrp) {
Denis Vlasenkoc8653f62009-04-27 23:29:14 +00009575 /* Set other signals to restore saved_tty_pgrp */
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02009576 install_fatal_sighandlers();
Denis Vlasenkoc8653f62009-04-27 23:29:14 +00009577 /* Put ourselves in our own process group
9578 * (bash, too, does this only if ctty is available) */
9579 bb_setpgrp(); /* is the same as setpgid(our_pid, our_pid); */
9580 /* Grab control of the terminal */
9581 tcsetpgrp(G_interactive_fd, getpid());
9582 }
Denys Vlasenko550bf5b2015-10-09 16:42:57 +02009583 enable_restore_tty_pgrp_on_exit();
Denys Vlasenko4840ae82011-09-04 15:28:03 +02009584
9585# if ENABLE_HUSH_SAVEHISTORY && MAX_HISTORY > 0
9586 {
9587 const char *hp = get_local_var_value("HISTFILE");
9588 if (!hp) {
9589 hp = get_local_var_value("HOME");
9590 if (hp)
9591 hp = concat_path_file(hp, ".hush_history");
9592 } else {
9593 hp = xstrdup(hp);
9594 }
9595 if (hp) {
9596 G.line_input_state->hist_file = hp;
Denys Vlasenko4840ae82011-09-04 15:28:03 +02009597 //set_local_var(xasprintf("HISTFILE=%s", ...));
9598 }
9599# if ENABLE_FEATURE_SH_HISTFILESIZE
9600 hp = get_local_var_value("HISTFILESIZE");
9601 G.line_input_state->max_history = size_from_HISTFILESIZE(hp);
9602# endif
9603 }
9604# endif
Denys Vlasenkoe89a2412010-01-12 15:19:31 +01009605 } else {
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02009606 install_special_sighandlers();
Denys Vlasenkoe89a2412010-01-12 15:19:31 +01009607 }
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00009608#elif ENABLE_HUSH_INTERACTIVE
Denis Vlasenkof9375282009-04-05 19:13:39 +00009609 /* No job control compiled in, only prompt/line editing */
9610 if (isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)) {
Denys Vlasenko9acd63c2018-03-28 18:35:07 +02009611 G_interactive_fd = dup_CLOEXEC(STDIN_FILENO, 254);
Denis Vlasenko60b392f2009-04-03 19:14:32 +00009612 if (G_interactive_fd < 0) {
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00009613 /* try to dup to any fd */
Denys Vlasenko9acd63c2018-03-28 18:35:07 +02009614 G_interactive_fd = dup_CLOEXEC(STDIN_FILENO);
Denis Vlasenko60b392f2009-04-03 19:14:32 +00009615 if (G_interactive_fd < 0)
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00009616 /* give up */
Denis Vlasenko60b392f2009-04-03 19:14:32 +00009617 G_interactive_fd = 0;
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00009618 }
9619 }
Denis Vlasenko60b392f2009-04-03 19:14:32 +00009620 if (G_interactive_fd) {
Denis Vlasenkof9375282009-04-05 19:13:39 +00009621 close_on_exec_on(G_interactive_fd);
Denis Vlasenkof9375282009-04-05 19:13:39 +00009622 }
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02009623 install_special_sighandlers();
Denis Vlasenkof9375282009-04-05 19:13:39 +00009624#else
9625 /* We have interactiveness code disabled */
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02009626 install_special_sighandlers();
Denis Vlasenkof9375282009-04-05 19:13:39 +00009627#endif
9628 /* bash:
9629 * if interactive but not a login shell, sources ~/.bashrc
9630 * (--norc turns this off, --rcfile <file> overrides)
9631 */
9632
9633 if (!ENABLE_FEATURE_SH_EXTRA_QUIET && G_interactive_fd) {
Denys Vlasenkoc34c0332009-09-29 12:25:30 +02009634 /* note: ash and hush share this string */
9635 printf("\n\n%s %s\n"
9636 IF_HUSH_HELP("Enter 'help' for a list of built-in commands.\n")
9637 "\n",
9638 bb_banner,
9639 "hush - the humble shell"
9640 );
Mike Frysingerb2705e12009-03-23 08:44:02 +00009641 }
9642
Denis Vlasenkof9375282009-04-05 19:13:39 +00009643 parse_and_run_file(stdin);
Eric Andersen25f27032001-04-26 23:22:31 +00009644
Denis Vlasenkod76c0492007-05-25 02:16:25 +00009645 final_return:
Denis Vlasenkoab2b0642009-04-06 18:42:11 +00009646 hush_exit(G.last_exitcode);
Eric Andersen25f27032001-04-26 23:22:31 +00009647}
Denis Vlasenko96702ca2007-11-23 23:28:55 +00009648
9649
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009650/*
9651 * Built-ins
9652 */
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02009653static int FAST_FUNC builtin_true(char **argv UNUSED_PARAM)
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009654{
9655 return 0;
9656}
9657
Denys Vlasenko265062d2017-01-10 15:13:30 +01009658#if ENABLE_HUSH_TEST || ENABLE_HUSH_ECHO || ENABLE_HUSH_PRINTF || ENABLE_HUSH_KILL
Denys Vlasenko8bc7f2c2009-10-19 13:20:52 +02009659static int run_applet_main(char **argv, int (*applet_main_func)(int argc, char **argv))
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009660{
Denys Vlasenkod4e4fdb2017-07-03 21:31:16 +02009661 int argc = string_array_len(argv);
9662 return applet_main_func(argc, argv);
Mike Frysingerccb19592009-10-15 03:31:15 -04009663}
Denys Vlasenko265062d2017-01-10 15:13:30 +01009664#endif
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01009665#if ENABLE_HUSH_TEST || BASH_TEST2
Mike Frysingerccb19592009-10-15 03:31:15 -04009666static int FAST_FUNC builtin_test(char **argv)
9667{
Denys Vlasenkoc0836532009-10-19 13:13:06 +02009668 return run_applet_main(argv, test_main);
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009669}
Denys Vlasenko265062d2017-01-10 15:13:30 +01009670#endif
Denys Vlasenko1cc68042017-01-09 17:10:04 +01009671#if ENABLE_HUSH_ECHO
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02009672static int FAST_FUNC builtin_echo(char **argv)
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009673{
Denys Vlasenkoc0836532009-10-19 13:13:06 +02009674 return run_applet_main(argv, echo_main);
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009675}
Denys Vlasenko1cc68042017-01-09 17:10:04 +01009676#endif
Denys Vlasenko1125d7d2017-01-08 17:19:38 +01009677#if ENABLE_HUSH_PRINTF
Mike Frysinger4ebc76c2009-10-15 03:32:39 -04009678static int FAST_FUNC builtin_printf(char **argv)
9679{
Denys Vlasenkoc0836532009-10-19 13:13:06 +02009680 return run_applet_main(argv, printf_main);
Mike Frysinger4ebc76c2009-10-15 03:32:39 -04009681}
9682#endif
9683
Denys Vlasenkoa1184af2017-01-10 15:58:02 +01009684#if ENABLE_HUSH_HELP
9685static int FAST_FUNC builtin_help(char **argv UNUSED_PARAM)
9686{
9687 const struct built_in_command *x;
9688
9689 printf(
9690 "Built-in commands:\n"
9691 "------------------\n");
9692 for (x = bltins1; x != &bltins1[ARRAY_SIZE(bltins1)]; x++) {
9693 if (x->b_descr)
9694 printf("%-10s%s\n", x->b_cmd, x->b_descr);
9695 }
9696 return EXIT_SUCCESS;
9697}
9698#endif
9699
9700#if MAX_HISTORY && ENABLE_FEATURE_EDITING
9701static int FAST_FUNC builtin_history(char **argv UNUSED_PARAM)
9702{
9703 show_history(G.line_input_state);
9704 return EXIT_SUCCESS;
9705}
9706#endif
9707
Denys Vlasenkob131cce2010-05-20 03:39:43 +02009708static char **skip_dash_dash(char **argv)
9709{
9710 argv++;
9711 if (argv[0] && argv[0][0] == '-' && argv[0][1] == '-' && argv[0][2] == '\0')
9712 argv++;
9713 return argv;
9714}
9715
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02009716static int FAST_FUNC builtin_cd(char **argv)
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009717{
Denys Vlasenkob131cce2010-05-20 03:39:43 +02009718 const char *newdir;
9719
9720 argv = skip_dash_dash(argv);
9721 newdir = argv[0];
Denis Vlasenkobfbc9712009-04-06 12:04:42 +00009722 if (newdir == NULL) {
Denis Vlasenkob6e65562009-04-03 16:49:04 +00009723 /* bash does nothing (exitcode 0) if HOME is ""; if it's unset,
Denis Vlasenko0b677d82009-04-10 13:49:10 +00009724 * bash says "bash: cd: HOME not set" and does nothing
9725 * (exitcode 1)
Denis Vlasenkob6e65562009-04-03 16:49:04 +00009726 */
Denys Vlasenko90a99042009-09-06 02:36:23 +02009727 const char *home = get_local_var_value("HOME");
9728 newdir = home ? home : "/";
Denis Vlasenkob0a64782009-04-06 11:33:07 +00009729 }
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009730 if (chdir(newdir)) {
Denis Vlasenkobfbc9712009-04-06 12:04:42 +00009731 /* Mimic bash message exactly */
9732 bb_perror_msg("cd: %s", newdir);
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009733 return EXIT_FAILURE;
9734 }
Denys Vlasenko6db47842009-09-05 20:15:17 +02009735 /* Read current dir (get_cwd(1) is inside) and set PWD.
9736 * Note: do not enforce exporting. If PWD was unset or unexported,
9737 * set it again, but do not export. bash does the same.
9738 */
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02009739 set_pwd_var(/*flag:*/ 0);
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009740 return EXIT_SUCCESS;
9741}
9742
Denys Vlasenkoa1184af2017-01-10 15:58:02 +01009743static int FAST_FUNC builtin_pwd(char **argv UNUSED_PARAM)
9744{
9745 puts(get_cwd(0));
9746 return EXIT_SUCCESS;
9747}
9748
9749static int FAST_FUNC builtin_eval(char **argv)
9750{
9751 int rcode = EXIT_SUCCESS;
9752
9753 argv = skip_dash_dash(argv);
Denys Vlasenko1f191122018-01-11 13:17:30 +01009754 if (argv[0]) {
9755 char *str = NULL;
9756
9757 if (argv[1]) {
9758 /* "The eval utility shall construct a command by
9759 * concatenating arguments together, separating
9760 * each with a <space> character."
9761 */
9762 char *p;
9763 unsigned len = 0;
9764 char **pp = argv;
9765 do
9766 len += strlen(*pp) + 1;
9767 while (*++pp);
9768 str = p = xmalloc(len);
9769 pp = argv;
9770 do {
9771 p = stpcpy(p, *pp);
9772 *p++ = ' ';
9773 } while (*++pp);
9774 p[-1] = '\0';
9775 }
9776
Denys Vlasenkoa1184af2017-01-10 15:58:02 +01009777 /* bash:
9778 * eval "echo Hi; done" ("done" is syntax error):
9779 * "echo Hi" will not execute too.
9780 */
Denys Vlasenko1f191122018-01-11 13:17:30 +01009781 parse_and_run_string(str ? str : argv[0]);
Denys Vlasenkoa1184af2017-01-10 15:58:02 +01009782 free(str);
9783 rcode = G.last_exitcode;
9784 }
9785 return rcode;
9786}
9787
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02009788static int FAST_FUNC builtin_exec(char **argv)
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009789{
Denys Vlasenkob131cce2010-05-20 03:39:43 +02009790 argv = skip_dash_dash(argv);
9791 if (argv[0] == NULL)
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009792 return EXIT_SUCCESS; /* bash does this */
Denys Vlasenkof37eb392009-10-18 11:46:35 +02009793
Denys Vlasenkof37eb392009-10-18 11:46:35 +02009794 /* Careful: we can end up here after [v]fork. Do not restore
9795 * tty pgrp then, only top-level shell process does that */
9796 if (G_saved_tty_pgrp && getpid() == G.root_pid)
9797 tcsetpgrp(G_interactive_fd, G_saved_tty_pgrp);
9798
Denys Vlasenko5b3d2eb2017-07-31 18:02:28 +02009799 /* Saved-redirect fds, script fds and G_interactive_fd are still
9800 * open here. However, they are all CLOEXEC, and execv below
9801 * closes them. Try interactive "exec ls -l /proc/self/fd",
9802 * it should show no extra open fds in the "ls" process.
9803 * If we'd try to run builtins/NOEXECs, this would need improving.
9804 */
9805 //close_saved_fds_and_FILE_fds();
9806
Denys Vlasenko3ef4f772009-10-19 23:09:06 +02009807 /* TODO: if exec fails, bash does NOT exit! We do.
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02009808 * We'll need to undo trap cleanup (it's inside execvp_or_die)
Denys Vlasenko3ef4f772009-10-19 23:09:06 +02009809 * and tcsetpgrp, and this is inherently racy.
9810 */
9811 execvp_or_die(argv);
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009812}
9813
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02009814static int FAST_FUNC builtin_exit(char **argv)
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009815{
Denis Vlasenkocd418a22009-04-06 18:08:35 +00009816 debug_printf_exec("%s()\n", __func__);
Denis Vlasenko40e84372009-04-18 11:23:38 +00009817
9818 /* interactive bash:
9819 * # trap "echo EEE" EXIT
9820 * # exit
9821 * exit
9822 * There are stopped jobs.
9823 * (if there are _stopped_ jobs, running ones don't count)
9824 * # exit
9825 * exit
Denys Vlasenko6830ade2013-01-15 13:58:01 +01009826 * EEE (then bash exits)
Denis Vlasenko40e84372009-04-18 11:23:38 +00009827 *
Denys Vlasenkoa110c902010-09-12 15:38:04 +02009828 * TODO: we can use G.exiting = -1 as indicator "last cmd was exit"
Denis Vlasenko40e84372009-04-18 11:23:38 +00009829 */
Denis Vlasenkoefea9d22009-04-09 13:43:11 +00009830
9831 /* note: EXIT trap is run by hush_exit */
Denys Vlasenkob131cce2010-05-20 03:39:43 +02009832 argv = skip_dash_dash(argv);
9833 if (argv[0] == NULL)
Denis Vlasenkoab2b0642009-04-06 18:42:11 +00009834 hush_exit(G.last_exitcode);
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009835 /* mimic bash: exit 123abc == exit 255 + error msg */
9836 xfunc_error_retval = 255;
9837 /* bash: exit -2 == exit 254, no error msg */
Denys Vlasenkob131cce2010-05-20 03:39:43 +02009838 hush_exit(xatoi(argv[0]) & 0xff);
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009839}
9840
Denys Vlasenkoa1184af2017-01-10 15:58:02 +01009841#if ENABLE_HUSH_TYPE
9842/* http://www.opengroup.org/onlinepubs/9699919799/utilities/type.html */
9843static int FAST_FUNC builtin_type(char **argv)
9844{
9845 int ret = EXIT_SUCCESS;
9846
9847 while (*++argv) {
9848 const char *type;
9849 char *path = NULL;
9850
9851 if (0) {} /* make conditional compile easier below */
9852 /*else if (find_alias(*argv))
9853 type = "an alias";*/
9854#if ENABLE_HUSH_FUNCTIONS
9855 else if (find_function(*argv))
9856 type = "a function";
9857#endif
9858 else if (find_builtin(*argv))
9859 type = "a shell builtin";
9860 else if ((path = find_in_path(*argv)) != NULL)
9861 type = path;
9862 else {
9863 bb_error_msg("type: %s: not found", *argv);
9864 ret = EXIT_FAILURE;
9865 continue;
9866 }
9867
9868 printf("%s is %s\n", *argv, type);
9869 free(path);
9870 }
9871
9872 return ret;
9873}
9874#endif
9875
9876#if ENABLE_HUSH_READ
9877/* Interruptibility of read builtin in bash
9878 * (tested on bash-4.2.8 by sending signals (not by ^C)):
9879 *
9880 * Empty trap makes read ignore corresponding signal, for any signal.
9881 *
9882 * SIGINT:
9883 * - terminates non-interactive shell;
9884 * - interrupts read in interactive shell;
9885 * if it has non-empty trap:
9886 * - executes trap and returns to command prompt in interactive shell;
9887 * - executes trap and returns to read in non-interactive shell;
9888 * SIGTERM:
9889 * - is ignored (does not interrupt) read in interactive shell;
9890 * - terminates non-interactive shell;
9891 * if it has non-empty trap:
9892 * - executes trap and returns to read;
9893 * SIGHUP:
9894 * - terminates shell (regardless of interactivity);
9895 * if it has non-empty trap:
9896 * - executes trap and returns to read;
Denys Vlasenkof5470412017-05-22 19:34:45 +02009897 * SIGCHLD from children:
9898 * - does not interrupt read regardless of interactivity:
9899 * try: sleep 1 & read x; echo $x
Denys Vlasenkoa1184af2017-01-10 15:58:02 +01009900 */
9901static int FAST_FUNC builtin_read(char **argv)
9902{
9903 const char *r;
9904 char *opt_n = NULL;
9905 char *opt_p = NULL;
9906 char *opt_t = NULL;
9907 char *opt_u = NULL;
Denys Vlasenko1f41c882017-08-09 13:52:36 +02009908 char *opt_d = NULL; /* optimized out if !BASH */
Denys Vlasenkoa1184af2017-01-10 15:58:02 +01009909 const char *ifs;
9910 int read_flags;
9911
9912 /* "!": do not abort on errors.
9913 * Option string must start with "sr" to match BUILTIN_READ_xxx
9914 */
Denys Vlasenko1f41c882017-08-09 13:52:36 +02009915 read_flags = getopt32(argv,
9916#if BASH_READ_D
9917 "!srn:p:t:u:d:", &opt_n, &opt_p, &opt_t, &opt_u, &opt_d
9918#else
9919 "!srn:p:t:u:", &opt_n, &opt_p, &opt_t, &opt_u
9920#endif
9921 );
Denys Vlasenkoa1184af2017-01-10 15:58:02 +01009922 if (read_flags == (uint32_t)-1)
9923 return EXIT_FAILURE;
9924 argv += optind;
9925 ifs = get_local_var_value("IFS"); /* can be NULL */
9926
9927 again:
9928 r = shell_builtin_read(set_local_var_from_halves,
9929 argv,
9930 ifs,
9931 read_flags,
9932 opt_n,
9933 opt_p,
9934 opt_t,
Denys Vlasenko1f41c882017-08-09 13:52:36 +02009935 opt_u,
9936 opt_d
Denys Vlasenkoa1184af2017-01-10 15:58:02 +01009937 );
9938
9939 if ((uintptr_t)r == 1 && errno == EINTR) {
9940 unsigned sig = check_and_run_traps();
Denys Vlasenkof5470412017-05-22 19:34:45 +02009941 if (sig != SIGINT)
Denys Vlasenkoa1184af2017-01-10 15:58:02 +01009942 goto again;
9943 }
9944
9945 if ((uintptr_t)r > 1) {
9946 bb_error_msg("%s", r);
9947 r = (char*)(uintptr_t)1;
9948 }
9949
9950 return (uintptr_t)r;
9951}
9952#endif
9953
9954#if ENABLE_HUSH_UMASK
9955static int FAST_FUNC builtin_umask(char **argv)
9956{
9957 int rc;
9958 mode_t mask;
9959
9960 rc = 1;
9961 mask = umask(0);
9962 argv = skip_dash_dash(argv);
9963 if (argv[0]) {
9964 mode_t old_mask = mask;
9965
9966 /* numeric umasks are taken as-is */
9967 /* symbolic umasks are inverted: "umask a=rx" calls umask(222) */
9968 if (!isdigit(argv[0][0]))
9969 mask ^= 0777;
9970 mask = bb_parse_mode(argv[0], mask);
9971 if (!isdigit(argv[0][0]))
9972 mask ^= 0777;
9973 if ((unsigned)mask > 0777) {
9974 mask = old_mask;
9975 /* bash messages:
9976 * bash: umask: 'q': invalid symbolic mode operator
9977 * bash: umask: 999: octal number out of range
9978 */
9979 bb_error_msg("%s: invalid mode '%s'", "umask", argv[0]);
9980 rc = 0;
9981 }
9982 } else {
9983 /* Mimic bash */
9984 printf("%04o\n", (unsigned) mask);
9985 /* fall through and restore mask which we set to 0 */
9986 }
9987 umask(mask);
9988
9989 return !rc; /* rc != 0 - success */
9990}
9991#endif
9992
Denys Vlasenko41ade052017-01-08 18:56:24 +01009993#if ENABLE_HUSH_EXPORT || ENABLE_HUSH_TRAP
Denis Vlasenko38e626d2009-04-18 12:58:19 +00009994static void print_escaped(const char *s)
9995{
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02009996 if (*s == '\'')
9997 goto squote;
Denis Vlasenko38e626d2009-04-18 12:58:19 +00009998 do {
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02009999 const char *p = strchrnul(s, '\'');
10000 /* print 'xxxx', possibly just '' */
10001 printf("'%.*s'", (int)(p - s), s);
10002 if (*p == '\0')
10003 break;
10004 s = p;
10005 squote:
Denis Vlasenko38e626d2009-04-18 12:58:19 +000010006 /* s points to '; print "'''...'''" */
10007 putchar('"');
10008 do putchar('\''); while (*++s == '\'');
10009 putchar('"');
10010 } while (*s);
10011}
Denys Vlasenko41ade052017-01-08 18:56:24 +010010012#endif
Denis Vlasenko38e626d2009-04-18 12:58:19 +000010013
Denys Vlasenko1e660422017-07-17 21:10:50 +020010014#if ENABLE_HUSH_EXPORT || ENABLE_HUSH_LOCAL || ENABLE_HUSH_READONLY
Denys Vlasenko3bab36b2017-07-18 01:05:24 +020010015static int helper_export_local(char **argv, unsigned flags)
Denys Vlasenko295fef82009-06-03 12:47:26 +020010016{
10017 do {
10018 char *name = *argv;
Denys Vlasenko27c56f12010-09-07 09:56:34 +020010019 char *name_end = strchrnul(name, '=');
Denys Vlasenko295fef82009-06-03 12:47:26 +020010020
10021 /* So far we do not check that name is valid (TODO?) */
10022
Denys Vlasenko27c56f12010-09-07 09:56:34 +020010023 if (*name_end == '\0') {
10024 struct variable *var, **vpp;
Denys Vlasenko295fef82009-06-03 12:47:26 +020010025
Denys Vlasenko27c56f12010-09-07 09:56:34 +020010026 vpp = get_ptr_to_local_var(name, name_end - name);
10027 var = vpp ? *vpp : NULL;
10028
Denys Vlasenko3bab36b2017-07-18 01:05:24 +020010029 if (flags & SETFLAG_UNEXPORT) {
Denys Vlasenko295fef82009-06-03 12:47:26 +020010030 /* export -n NAME (without =VALUE) */
10031 if (var) {
10032 var->flg_export = 0;
10033 debug_printf_env("%s: unsetenv '%s'\n", __func__, name);
10034 unsetenv(name);
10035 } /* else: export -n NOT_EXISTING_VAR: no-op */
10036 continue;
10037 }
Denys Vlasenko3bab36b2017-07-18 01:05:24 +020010038 if (flags & SETFLAG_EXPORT) {
Denys Vlasenko295fef82009-06-03 12:47:26 +020010039 /* export NAME (without =VALUE) */
10040 if (var) {
10041 var->flg_export = 1;
10042 debug_printf_env("%s: putenv '%s'\n", __func__, var->varstr);
10043 putenv(var->varstr);
10044 continue;
10045 }
10046 }
Denys Vlasenko38ef39a2017-07-18 01:40:01 +020010047 if (flags & SETFLAG_MAKE_RO) {
10048 /* readonly NAME (without =VALUE) */
10049 if (var) {
10050 var->flg_read_only = 1;
10051 continue;
10052 }
10053 }
Denys Vlasenko6ec76d82017-01-08 18:40:41 +010010054# if ENABLE_HUSH_LOCAL
Denys Vlasenkob95ee962017-07-17 21:19:53 +020010055 /* Is this "local" bltin? */
Denys Vlasenko3bab36b2017-07-18 01:05:24 +020010056 if (!(flags & (SETFLAG_EXPORT|SETFLAG_UNEXPORT|SETFLAG_MAKE_RO))) {
Denys Vlasenko332e4112018-04-04 22:32:59 +020010057 unsigned lvl = flags >> SETFLAG_VARLVL_SHIFT;
10058 if (var && var->var_nest_level == lvl) {
Denys Vlasenkob95ee962017-07-17 21:19:53 +020010059 /* "local x=abc; ...; local x" - ignore second local decl */
10060 continue;
10061 }
Denys Vlasenko61508d92016-10-02 21:12:02 +020010062 }
Denys Vlasenko6ec76d82017-01-08 18:40:41 +010010063# endif
Denys Vlasenko295fef82009-06-03 12:47:26 +020010064 /* Exporting non-existing variable.
10065 * bash does not put it in environment,
10066 * but remembers that it is exported,
10067 * and does put it in env when it is set later.
Denys Vlasenko1e660422017-07-17 21:10:50 +020010068 * We just set it to "" and export.
10069 */
Denys Vlasenko295fef82009-06-03 12:47:26 +020010070 /* Or, it's "local NAME" (without =VALUE).
Denys Vlasenko1e660422017-07-17 21:10:50 +020010071 * bash sets the value to "".
10072 */
10073 /* Or, it's "readonly NAME" (without =VALUE).
10074 * bash remembers NAME and disallows its creation
10075 * in the future.
10076 */
Denys Vlasenko295fef82009-06-03 12:47:26 +020010077 name = xasprintf("%s=", name);
10078 } else {
10079 /* (Un)exporting/making local NAME=VALUE */
10080 name = xstrdup(name);
10081 }
Denys Vlasenko21b7f1b2018-04-05 15:15:53 +020010082 debug_printf_env("%s: set_local_var('%s')\n", __func__, name);
Denys Vlasenko38ef39a2017-07-18 01:40:01 +020010083 if (set_local_var(name, flags))
10084 return EXIT_FAILURE;
Denys Vlasenko295fef82009-06-03 12:47:26 +020010085 } while (*++argv);
Denys Vlasenko1e660422017-07-17 21:10:50 +020010086 return EXIT_SUCCESS;
Denys Vlasenko295fef82009-06-03 12:47:26 +020010087}
Denys Vlasenko6ec76d82017-01-08 18:40:41 +010010088#endif
Denys Vlasenko295fef82009-06-03 12:47:26 +020010089
Denys Vlasenko6ec76d82017-01-08 18:40:41 +010010090#if ENABLE_HUSH_EXPORT
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +020010091static int FAST_FUNC builtin_export(char **argv)
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010092{
Denis Vlasenkoad4bd052009-04-20 22:04:21 +000010093 unsigned opt_unexport;
10094
Denys Vlasenkodf5131c2009-06-07 16:04:17 +020010095#if ENABLE_HUSH_EXPORT_N
10096 /* "!": do not abort on errors */
10097 opt_unexport = getopt32(argv, "!n");
10098 if (opt_unexport == (uint32_t)-1)
10099 return EXIT_FAILURE;
10100 argv += optind;
10101#else
10102 opt_unexport = 0;
10103 argv++;
10104#endif
10105
10106 if (argv[0] == NULL) {
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010107 char **e = environ;
Denis Vlasenko0b677d82009-04-10 13:49:10 +000010108 if (e) {
10109 while (*e) {
10110#if 0
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010111 puts(*e++);
Denis Vlasenko0b677d82009-04-10 13:49:10 +000010112#else
10113 /* ash emits: export VAR='VAL'
10114 * bash: declare -x VAR="VAL"
10115 * we follow ash example */
10116 const char *s = *e++;
10117 const char *p = strchr(s, '=');
10118
10119 if (!p) /* wtf? take next variable */
10120 continue;
10121 /* export var= */
10122 printf("export %.*s", (int)(p - s) + 1, s);
Denis Vlasenko38e626d2009-04-18 12:58:19 +000010123 print_escaped(p + 1);
Denis Vlasenko0b677d82009-04-10 13:49:10 +000010124 putchar('\n');
10125#endif
10126 }
Denys Vlasenko8131eea2009-11-02 14:19:51 +010010127 /*fflush_all(); - done after each builtin anyway */
Denis Vlasenko0b677d82009-04-10 13:49:10 +000010128 }
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010129 return EXIT_SUCCESS;
10130 }
10131
Denys Vlasenko3bab36b2017-07-18 01:05:24 +020010132 return helper_export_local(argv, opt_unexport ? SETFLAG_UNEXPORT : SETFLAG_EXPORT);
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010133}
Denys Vlasenko6ec76d82017-01-08 18:40:41 +010010134#endif
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010135
Denys Vlasenko295fef82009-06-03 12:47:26 +020010136#if ENABLE_HUSH_LOCAL
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +020010137static int FAST_FUNC builtin_local(char **argv)
Denys Vlasenko295fef82009-06-03 12:47:26 +020010138{
10139 if (G.func_nest_level == 0) {
10140 bb_error_msg("%s: not in a function", argv[0]);
10141 return EXIT_FAILURE; /* bash compat */
10142 }
Denys Vlasenko1e660422017-07-17 21:10:50 +020010143 argv++;
Denys Vlasenkod358b0b2018-04-05 00:51:55 +020010144 /* Since all builtins run in a nested variable level,
10145 * need to use level - 1 here. Or else the variable will be removed at once
10146 * after builtin returns.
10147 */
10148 return helper_export_local(argv, (G.var_nest_level - 1) << SETFLAG_VARLVL_SHIFT);
Denys Vlasenko295fef82009-06-03 12:47:26 +020010149}
10150#endif
10151
Denys Vlasenko1e660422017-07-17 21:10:50 +020010152#if ENABLE_HUSH_READONLY
10153static int FAST_FUNC builtin_readonly(char **argv)
10154{
Denys Vlasenko3bab36b2017-07-18 01:05:24 +020010155 argv++;
10156 if (*argv == NULL) {
Denys Vlasenko1e660422017-07-17 21:10:50 +020010157 /* bash: readonly [-p]: list all readonly VARs
10158 * (-p has no effect in bash)
10159 */
10160 struct variable *e;
10161 for (e = G.top_var; e; e = e->next) {
10162 if (e->flg_read_only) {
10163//TODO: quote value: readonly VAR='VAL'
10164 printf("readonly %s\n", e->varstr);
10165 }
10166 }
10167 return EXIT_SUCCESS;
10168 }
Denys Vlasenko3bab36b2017-07-18 01:05:24 +020010169 return helper_export_local(argv, SETFLAG_MAKE_RO);
Denys Vlasenko1e660422017-07-17 21:10:50 +020010170}
10171#endif
10172
Denys Vlasenko10d5ece2017-01-08 18:28:43 +010010173#if ENABLE_HUSH_UNSET
Denys Vlasenko61508d92016-10-02 21:12:02 +020010174/* http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#unset */
10175static int FAST_FUNC builtin_unset(char **argv)
10176{
10177 int ret;
10178 unsigned opts;
10179
10180 /* "!": do not abort on errors */
10181 /* "+": stop at 1st non-option */
10182 opts = getopt32(argv, "!+vf");
10183 if (opts == (unsigned)-1)
10184 return EXIT_FAILURE;
10185 if (opts == 3) {
10186 bb_error_msg("unset: -v and -f are exclusive");
10187 return EXIT_FAILURE;
10188 }
10189 argv += optind;
10190
10191 ret = EXIT_SUCCESS;
10192 while (*argv) {
10193 if (!(opts & 2)) { /* not -f */
10194 if (unset_local_var(*argv)) {
10195 /* unset <nonexistent_var> doesn't fail.
10196 * Error is when one tries to unset RO var.
10197 * Message was printed by unset_local_var. */
10198 ret = EXIT_FAILURE;
10199 }
10200 }
Denys Vlasenko10d5ece2017-01-08 18:28:43 +010010201# if ENABLE_HUSH_FUNCTIONS
Denys Vlasenko61508d92016-10-02 21:12:02 +020010202 else {
10203 unset_func(*argv);
10204 }
Denys Vlasenko10d5ece2017-01-08 18:28:43 +010010205# endif
Denys Vlasenko61508d92016-10-02 21:12:02 +020010206 argv++;
10207 }
10208 return ret;
10209}
Denys Vlasenko10d5ece2017-01-08 18:28:43 +010010210#endif
Denys Vlasenko61508d92016-10-02 21:12:02 +020010211
Denys Vlasenko10d5ece2017-01-08 18:28:43 +010010212#if ENABLE_HUSH_SET
Denys Vlasenko61508d92016-10-02 21:12:02 +020010213/* http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#set
10214 * built-in 'set' handler
10215 * SUSv3 says:
10216 * set [-abCefhmnuvx] [-o option] [argument...]
10217 * set [+abCefhmnuvx] [+o option] [argument...]
10218 * set -- [argument...]
10219 * set -o
10220 * set +o
10221 * Implementations shall support the options in both their hyphen and
10222 * plus-sign forms. These options can also be specified as options to sh.
10223 * Examples:
10224 * Write out all variables and their values: set
10225 * Set $1, $2, and $3 and set "$#" to 3: set c a b
10226 * Turn on the -x and -v options: set -xv
10227 * Unset all positional parameters: set --
10228 * Set $1 to the value of x, even if it begins with '-' or '+': set -- "$x"
10229 * Set the positional parameters to the expansion of x, even if x expands
10230 * with a leading '-' or '+': set -- $x
10231 *
10232 * So far, we only support "set -- [argument...]" and some of the short names.
10233 */
10234static int FAST_FUNC builtin_set(char **argv)
10235{
10236 int n;
10237 char **pp, **g_argv;
10238 char *arg = *++argv;
10239
10240 if (arg == NULL) {
10241 struct variable *e;
10242 for (e = G.top_var; e; e = e->next)
10243 puts(e->varstr);
10244 return EXIT_SUCCESS;
10245 }
10246
10247 do {
10248 if (strcmp(arg, "--") == 0) {
10249 ++argv;
10250 goto set_argv;
10251 }
10252 if (arg[0] != '+' && arg[0] != '-')
10253 break;
10254 for (n = 1; arg[n]; ++n) {
10255 if (set_mode((arg[0] == '-'), arg[n], argv[1]))
10256 goto error;
10257 if (arg[n] == 'o' && argv[1])
10258 argv++;
10259 }
10260 } while ((arg = *++argv) != NULL);
10261 /* Now argv[0] is 1st argument */
10262
10263 if (arg == NULL)
10264 return EXIT_SUCCESS;
10265 set_argv:
10266
10267 /* NB: G.global_argv[0] ($0) is never freed/changed */
10268 g_argv = G.global_argv;
10269 if (G.global_args_malloced) {
10270 pp = g_argv;
10271 while (*++pp)
10272 free(*pp);
10273 g_argv[1] = NULL;
10274 } else {
10275 G.global_args_malloced = 1;
10276 pp = xzalloc(sizeof(pp[0]) * 2);
10277 pp[0] = g_argv[0]; /* retain $0 */
10278 g_argv = pp;
10279 }
10280 /* This realloc's G.global_argv */
10281 G.global_argv = pp = add_strings_to_strings(g_argv, argv, /*dup:*/ 1);
10282
Denys Vlasenkod4e4fdb2017-07-03 21:31:16 +020010283 G.global_argc = 1 + string_array_len(pp + 1);
Denys Vlasenko61508d92016-10-02 21:12:02 +020010284
10285 return EXIT_SUCCESS;
10286
10287 /* Nothing known, so abort */
10288 error:
Denys Vlasenko57000292018-01-12 14:41:45 +010010289 bb_error_msg("%s: %s: invalid option", "set", arg);
Denys Vlasenko61508d92016-10-02 21:12:02 +020010290 return EXIT_FAILURE;
10291}
Denys Vlasenko10d5ece2017-01-08 18:28:43 +010010292#endif
Denys Vlasenko61508d92016-10-02 21:12:02 +020010293
10294static int FAST_FUNC builtin_shift(char **argv)
10295{
10296 int n = 1;
10297 argv = skip_dash_dash(argv);
10298 if (argv[0]) {
Denys Vlasenkoe59591a2017-07-06 20:12:44 +020010299 n = bb_strtou(argv[0], NULL, 10);
10300 if (errno || n < 0) {
10301 /* shared string with ash.c */
10302 bb_error_msg("Illegal number: %s", argv[0]);
10303 /*
10304 * ash aborts in this case.
10305 * bash prints error message and set $? to 1.
10306 * Interestingly, for "shift 99999" bash does not
10307 * print error message, but does set $? to 1
10308 * (and does no shifting at all).
10309 */
10310 }
Denys Vlasenko61508d92016-10-02 21:12:02 +020010311 }
10312 if (n >= 0 && n < G.global_argc) {
Denys Vlasenko4e4f88e2017-01-09 07:57:38 +010010313 if (G_global_args_malloced) {
Denys Vlasenko61508d92016-10-02 21:12:02 +020010314 int m = 1;
10315 while (m <= n)
10316 free(G.global_argv[m++]);
10317 }
10318 G.global_argc -= n;
10319 memmove(&G.global_argv[1], &G.global_argv[n+1],
10320 G.global_argc * sizeof(G.global_argv[0]));
10321 return EXIT_SUCCESS;
10322 }
10323 return EXIT_FAILURE;
10324}
10325
Denys Vlasenko74d40582017-08-11 01:32:46 +020010326#if ENABLE_HUSH_GETOPTS
10327static int FAST_FUNC builtin_getopts(char **argv)
10328{
Denys Vlasenko9a7d0a02017-08-11 02:37:48 +020010329/* http://pubs.opengroup.org/onlinepubs/9699919799/utilities/getopts.html
10330
Denys Vlasenko74d40582017-08-11 01:32:46 +020010331TODO:
Denys Vlasenko74d40582017-08-11 01:32:46 +020010332If a required argument is not found, and getopts is not silent,
10333a question mark (?) is placed in VAR, OPTARG is unset, and a
10334diagnostic message is printed. If getopts is silent, then a
10335colon (:) is placed in VAR and OPTARG is set to the option
10336character found.
10337
10338Test that VAR is a valid variable name?
Denys Vlasenko9a7d0a02017-08-11 02:37:48 +020010339
10340"Whenever the shell is invoked, OPTIND shall be initialized to 1"
Denys Vlasenko74d40582017-08-11 01:32:46 +020010341*/
10342 char cbuf[2];
10343 const char *cp, *optstring, *var;
Denys Vlasenko238ff982017-08-29 13:38:30 +020010344 int c, n, exitcode, my_opterr;
10345 unsigned count;
Denys Vlasenko74d40582017-08-11 01:32:46 +020010346
10347 optstring = *++argv;
10348 if (!optstring || !(var = *++argv)) {
10349 bb_error_msg("usage: getopts OPTSTRING VAR [ARGS]");
10350 return EXIT_FAILURE;
10351 }
10352
Denys Vlasenko238ff982017-08-29 13:38:30 +020010353 if (argv[1])
10354 argv[0] = G.global_argv[0]; /* for error messages in getopt() */
10355 else
10356 argv = G.global_argv;
10357 cbuf[1] = '\0';
10358
10359 my_opterr = 0;
Denys Vlasenko048491f2017-08-17 12:36:39 +020010360 if (optstring[0] != ':') {
Denys Vlasenko419db032017-08-11 17:21:14 +020010361 cp = get_local_var_value("OPTERR");
Denys Vlasenko048491f2017-08-17 12:36:39 +020010362 /* 0 if "OPTERR=0", 1 otherwise */
Denys Vlasenko238ff982017-08-29 13:38:30 +020010363 my_opterr = (!cp || NOT_LONE_CHAR(cp, '0'));
Denys Vlasenko419db032017-08-11 17:21:14 +020010364 }
Denys Vlasenko74d40582017-08-11 01:32:46 +020010365
10366 /* getopts stops on first non-option. Add "+" to force that */
10367 /*if (optstring[0] != '+')*/ {
10368 char *s = alloca(strlen(optstring) + 2);
10369 sprintf(s, "+%s", optstring);
10370 optstring = s;
10371 }
10372
Denys Vlasenko238ff982017-08-29 13:38:30 +020010373 /* Naively, now we should just
10374 * cp = get_local_var_value("OPTIND");
10375 * optind = cp ? atoi(cp) : 0;
10376 * optarg = NULL;
10377 * opterr = my_opterr;
10378 * c = getopt(string_array_len(argv), argv, optstring);
10379 * and be done? Not so fast...
10380 * Unlike normal getopt() usage in C programs, here
10381 * each successive call will (usually) have the same argv[] CONTENTS,
10382 * but not the ADDRESSES. Worse yet, it's possible that between
10383 * invocations of "getopts", there will be calls to shell builtins
10384 * which use getopt() internally. Example:
10385 * while getopts "abc" RES -a -bc -abc de; do
10386 * unset -ff func
10387 * done
10388 * This would not work correctly: getopt() call inside "unset"
10389 * modifies internal libc state which is tracking position in
10390 * multi-option strings ("-abc"). At best, it can skip options
10391 * or return the same option infinitely. With glibc implementation
10392 * of getopt(), it would use outright invalid pointers and return
10393 * garbage even _without_ "unset" mangling internal state.
10394 *
10395 * We resort to resetting getopt() state and calling it N times,
10396 * until we get Nth result (or failure).
10397 * (N == G.getopt_count is reset to 0 whenever OPTIND is [un]set).
10398 */
Denys Vlasenko60161812017-08-29 14:32:17 +020010399 GETOPT_RESET();
Denys Vlasenko238ff982017-08-29 13:38:30 +020010400 count = 0;
10401 n = string_array_len(argv);
10402 do {
10403 optarg = NULL;
10404 opterr = (count < G.getopt_count) ? 0 : my_opterr;
10405 c = getopt(n, argv, optstring);
10406 if (c < 0)
10407 break;
10408 count++;
10409 } while (count <= G.getopt_count);
10410
10411 /* Set OPTIND. Prevent resetting of the magic counter! */
10412 set_local_var_from_halves("OPTIND", utoa(optind));
10413 G.getopt_count = count; /* "next time, give me N+1'th result" */
Denys Vlasenko60161812017-08-29 14:32:17 +020010414 GETOPT_RESET(); /* just in case */
Denys Vlasenko419db032017-08-11 17:21:14 +020010415
10416 /* Set OPTARG */
10417 /* Always set or unset, never left as-is, even on exit/error:
10418 * "If no option was found, or if the option that was found
10419 * does not have an option-argument, OPTARG shall be unset."
10420 */
10421 cp = optarg;
10422 if (c == '?') {
10423 /* If ":optstring" and unknown option is seen,
10424 * it is stored to OPTARG.
10425 */
10426 if (optstring[1] == ':') {
10427 cbuf[0] = optopt;
10428 cp = cbuf;
10429 }
10430 }
10431 if (cp)
10432 set_local_var_from_halves("OPTARG", cp);
10433 else
10434 unset_local_var("OPTARG");
10435
10436 /* Convert -1 to "?" */
Denys Vlasenko74d40582017-08-11 01:32:46 +020010437 exitcode = EXIT_SUCCESS;
10438 if (c < 0) { /* -1: end of options */
10439 exitcode = EXIT_FAILURE;
10440 c = '?';
10441 }
Denys Vlasenko419db032017-08-11 17:21:14 +020010442
Denys Vlasenko238ff982017-08-29 13:38:30 +020010443 /* Set VAR */
Denys Vlasenko74d40582017-08-11 01:32:46 +020010444 cbuf[0] = c;
Denys Vlasenko74d40582017-08-11 01:32:46 +020010445 set_local_var_from_halves(var, cbuf);
Denys Vlasenko9a7d0a02017-08-11 02:37:48 +020010446
Denys Vlasenko74d40582017-08-11 01:32:46 +020010447 return exitcode;
10448}
10449#endif
10450
Denys Vlasenkoa1184af2017-01-10 15:58:02 +010010451static int FAST_FUNC builtin_source(char **argv)
Denys Vlasenko61508d92016-10-02 21:12:02 +020010452{
Denys Vlasenkoa1184af2017-01-10 15:58:02 +010010453 char *arg_path, *filename;
10454 FILE *input;
10455 save_arg_t sv;
10456 char *args_need_save;
10457#if ENABLE_HUSH_FUNCTIONS
10458 smallint sv_flg;
Denys Vlasenko7a85c602017-01-08 17:40:18 +010010459#endif
Denys Vlasenko61508d92016-10-02 21:12:02 +020010460
Denys Vlasenkoa1184af2017-01-10 15:58:02 +010010461 argv = skip_dash_dash(argv);
10462 filename = argv[0];
10463 if (!filename) {
10464 /* bash says: "bash: .: filename argument required" */
10465 return 2; /* bash compat */
10466 }
10467 arg_path = NULL;
10468 if (!strchr(filename, '/')) {
10469 arg_path = find_in_path(filename);
10470 if (arg_path)
10471 filename = arg_path;
Denys Vlasenko54c21112018-01-27 20:46:45 +010010472 else if (!ENABLE_HUSH_BASH_SOURCE_CURDIR) {
Denys Vlasenkof7e0fea2018-01-27 19:05:59 +010010473 errno = ENOENT;
10474 bb_simple_perror_msg(filename);
10475 return EXIT_FAILURE;
10476 }
Denys Vlasenkoa1184af2017-01-10 15:58:02 +010010477 }
10478 input = remember_FILE(fopen_or_warn(filename, "r"));
10479 free(arg_path);
10480 if (!input) {
10481 /* bb_perror_msg("%s", *argv); - done by fopen_or_warn */
10482 /* POSIX: non-interactive shell should abort here,
10483 * not merely fail. So far no one complained :)
10484 */
10485 return EXIT_FAILURE;
10486 }
10487
10488#if ENABLE_HUSH_FUNCTIONS
10489 sv_flg = G_flag_return_in_progress;
10490 /* "we are inside sourced file, ok to use return" */
10491 G_flag_return_in_progress = -1;
10492#endif
10493 args_need_save = argv[1]; /* used as a boolean variable */
10494 if (args_need_save)
10495 save_and_replace_G_args(&sv, argv);
10496
10497 /* "false; . ./empty_line; echo Zero:$?" should print 0 */
10498 G.last_exitcode = 0;
10499 parse_and_run_file(input);
10500 fclose_and_forget(input);
10501
10502 if (args_need_save) /* can't use argv[1] instead: "shift" can mangle it */
10503 restore_G_args(&sv, argv);
10504#if ENABLE_HUSH_FUNCTIONS
10505 G_flag_return_in_progress = sv_flg;
10506#endif
10507
10508 return G.last_exitcode;
10509}
10510
Denys Vlasenko7a85c602017-01-08 17:40:18 +010010511#if ENABLE_HUSH_TRAP
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +020010512static int FAST_FUNC builtin_trap(char **argv)
Denis Vlasenko38e626d2009-04-18 12:58:19 +000010513{
Denis Vlasenko38e626d2009-04-18 12:58:19 +000010514 int sig;
10515 char *new_cmd;
10516
Denys Vlasenko7a85c602017-01-08 17:40:18 +010010517 if (!G_traps)
10518 G_traps = xzalloc(sizeof(G_traps[0]) * NSIG);
Denis Vlasenko38e626d2009-04-18 12:58:19 +000010519
10520 argv++;
10521 if (!*argv) {
Denis Vlasenko6008d8a2009-04-18 13:05:10 +000010522 int i;
Denis Vlasenko38e626d2009-04-18 12:58:19 +000010523 /* No args: print all trapped */
10524 for (i = 0; i < NSIG; ++i) {
Denys Vlasenko7a85c602017-01-08 17:40:18 +010010525 if (G_traps[i]) {
Denis Vlasenko38e626d2009-04-18 12:58:19 +000010526 printf("trap -- ");
Denys Vlasenko7a85c602017-01-08 17:40:18 +010010527 print_escaped(G_traps[i]);
Denys Vlasenkoe74aaf92009-09-27 02:05:45 +020010528 /* note: bash adds "SIG", but only if invoked
10529 * as "bash". If called as "sh", or if set -o posix,
10530 * then it prints short signal names.
10531 * We are printing short names: */
10532 printf(" %s\n", get_signame(i));
Denis Vlasenko38e626d2009-04-18 12:58:19 +000010533 }
10534 }
Denys Vlasenko8131eea2009-11-02 14:19:51 +010010535 /*fflush_all(); - done after each builtin anyway */
Denis Vlasenko38e626d2009-04-18 12:58:19 +000010536 return EXIT_SUCCESS;
10537 }
10538
10539 new_cmd = NULL;
Denis Vlasenko38e626d2009-04-18 12:58:19 +000010540 /* If first arg is a number: reset all specified signals */
10541 sig = bb_strtou(*argv, NULL, 10);
10542 if (errno == 0) {
10543 int ret;
10544 process_sig_list:
10545 ret = EXIT_SUCCESS;
10546 while (*argv) {
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +020010547 sighandler_t handler;
10548
Denis Vlasenko38e626d2009-04-18 12:58:19 +000010549 sig = get_signum(*argv++);
Denys Vlasenko86981e32017-07-25 20:06:17 +020010550 if (sig < 0) {
Denis Vlasenko38e626d2009-04-18 12:58:19 +000010551 ret = EXIT_FAILURE;
10552 /* Mimic bash message exactly */
Denys Vlasenko74562982017-07-06 18:40:45 +020010553 bb_error_msg("trap: %s: invalid signal specification", argv[-1]);
Denis Vlasenko38e626d2009-04-18 12:58:19 +000010554 continue;
10555 }
10556
Denys Vlasenko7a85c602017-01-08 17:40:18 +010010557 free(G_traps[sig]);
10558 G_traps[sig] = xstrdup(new_cmd);
Denis Vlasenko38e626d2009-04-18 12:58:19 +000010559
Denys Vlasenkoe89a2412010-01-12 15:19:31 +010010560 debug_printf("trap: setting SIG%s (%i) to '%s'\n",
Denys Vlasenko7a85c602017-01-08 17:40:18 +010010561 get_signame(sig), sig, G_traps[sig]);
Denis Vlasenko38e626d2009-04-18 12:58:19 +000010562
10563 /* There is no signal for 0 (EXIT) */
10564 if (sig == 0)
10565 continue;
10566
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +020010567 if (new_cmd)
10568 handler = (new_cmd[0] ? record_pending_signo : SIG_IGN);
10569 else
10570 /* We are removing trap handler */
10571 handler = pick_sighandler(sig);
Denys Vlasenko0806e402011-05-12 23:06:20 +020010572 install_sighandler(sig, handler);
Denis Vlasenko38e626d2009-04-18 12:58:19 +000010573 }
10574 return ret;
10575 }
10576
10577 if (!argv[1]) { /* no second arg */
10578 bb_error_msg("trap: invalid arguments");
10579 return EXIT_FAILURE;
10580 }
10581
10582 /* First arg is "-": reset all specified to default */
10583 /* First arg is "--": skip it, the rest is "handler SIGs..." */
10584 /* Everything else: set arg as signal handler
10585 * (includes "" case, which ignores signal) */
10586 if (argv[0][0] == '-') {
10587 if (argv[0][1] == '\0') { /* "-" */
10588 /* new_cmd remains NULL: "reset these sigs" */
10589 goto reset_traps;
10590 }
10591 if (argv[0][1] == '-' && argv[0][2] == '\0') { /* "--" */
10592 argv++;
10593 }
10594 /* else: "-something", no special meaning */
10595 }
10596 new_cmd = *argv;
10597 reset_traps:
10598 argv++;
10599 goto process_sig_list;
10600}
Denys Vlasenko7a85c602017-01-08 17:40:18 +010010601#endif
Denis Vlasenko38e626d2009-04-18 12:58:19 +000010602
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010603#if ENABLE_HUSH_JOB
Denys Vlasenko4e1c8b42016-11-07 20:06:40 +010010604static struct pipe *parse_jobspec(const char *str)
10605{
10606 struct pipe *pi;
Denys Vlasenkod5b5c2f2017-01-08 15:46:04 +010010607 unsigned jobnum;
Denys Vlasenko4e1c8b42016-11-07 20:06:40 +010010608
Denys Vlasenkod5b5c2f2017-01-08 15:46:04 +010010609 if (sscanf(str, "%%%u", &jobnum) != 1) {
10610 if (str[0] != '%'
10611 || (str[1] != '%' && str[1] != '+' && str[1] != '\0')
10612 ) {
10613 bb_error_msg("bad argument '%s'", str);
10614 return NULL;
10615 }
10616 /* It is "%%", "%+" or "%" - current job */
10617 jobnum = G.last_jobid;
10618 if (jobnum == 0) {
10619 bb_error_msg("no current job");
10620 return NULL;
10621 }
Denys Vlasenko4e1c8b42016-11-07 20:06:40 +010010622 }
10623 for (pi = G.job_list; pi; pi = pi->next) {
10624 if (pi->jobid == jobnum) {
10625 return pi;
10626 }
10627 }
Denys Vlasenkofd68f1e2017-01-09 05:47:57 +010010628 bb_error_msg("%u: no such job", jobnum);
Denys Vlasenko4e1c8b42016-11-07 20:06:40 +010010629 return NULL;
10630}
10631
Denys Vlasenkoa1184af2017-01-10 15:58:02 +010010632static int FAST_FUNC builtin_jobs(char **argv UNUSED_PARAM)
10633{
10634 struct pipe *job;
10635 const char *status_string;
10636
10637 checkjobs(NULL, 0 /*(no pid to wait for)*/);
10638 for (job = G.job_list; job; job = job->next) {
10639 if (job->alive_cmds == job->stopped_cmds)
10640 status_string = "Stopped";
10641 else
10642 status_string = "Running";
10643
10644 printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->cmdtext);
10645 }
Denys Vlasenko2ed74e22017-07-14 19:58:46 +020010646
10647 clean_up_last_dead_job();
10648
Denys Vlasenkoa1184af2017-01-10 15:58:02 +010010649 return EXIT_SUCCESS;
10650}
10651
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010652/* built-in 'fg' and 'bg' handler */
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +020010653static int FAST_FUNC builtin_fg_bg(char **argv)
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010654{
Denys Vlasenko4e1c8b42016-11-07 20:06:40 +010010655 int i;
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010656 struct pipe *pi;
10657
Denis Vlasenko60b392f2009-04-03 19:14:32 +000010658 if (!G_interactive_fd)
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010659 return EXIT_FAILURE;
Denis Vlasenkoc8653f62009-04-27 23:29:14 +000010660
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010661 /* If they gave us no args, assume they want the last backgrounded task */
10662 if (!argv[1]) {
Denis Vlasenko87a86552008-07-29 19:43:10 +000010663 for (pi = G.job_list; pi; pi = pi->next) {
10664 if (pi->jobid == G.last_jobid) {
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010665 goto found;
10666 }
10667 }
10668 bb_error_msg("%s: no current job", argv[0]);
10669 return EXIT_FAILURE;
10670 }
Denys Vlasenko4e1c8b42016-11-07 20:06:40 +010010671
10672 pi = parse_jobspec(argv[1]);
10673 if (!pi)
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010674 return EXIT_FAILURE;
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010675 found:
Denis Vlasenko6b9e0532009-04-18 01:23:21 +000010676 /* TODO: bash prints a string representation
10677 * of job being foregrounded (like "sleep 1 | cat") */
Mike Frysinger38478a62009-05-20 04:48:06 -040010678 if (argv[0][0] == 'f' && G_saved_tty_pgrp) {
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010679 /* Put the job into the foreground. */
Denis Vlasenko60b392f2009-04-03 19:14:32 +000010680 tcsetpgrp(G_interactive_fd, pi->pgrp);
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010681 }
10682
10683 /* Restart the processes in the job */
Denis Vlasenko9af22c72008-10-09 12:54:58 +000010684 debug_printf_jobs("reviving %d procs, pgrp %d\n", pi->num_cmds, pi->pgrp);
10685 for (i = 0; i < pi->num_cmds; i++) {
10686 debug_printf_jobs("reviving pid %d\n", pi->cmds[i].pid);
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010687 }
Denis Vlasenko9af22c72008-10-09 12:54:58 +000010688 pi->stopped_cmds = 0;
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010689
10690 i = kill(- pi->pgrp, SIGCONT);
10691 if (i < 0) {
10692 if (errno == ESRCH) {
Denys Vlasenko16096292017-07-10 10:00:28 +020010693 delete_finished_job(pi);
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010694 return EXIT_SUCCESS;
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010695 }
Denis Vlasenko34d4d892009-04-04 20:24:37 +000010696 bb_perror_msg("kill (SIGCONT)");
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010697 }
10698
Denis Vlasenko34d4d892009-04-04 20:24:37 +000010699 if (argv[0][0] == 'f') {
Denys Vlasenko16096292017-07-10 10:00:28 +020010700 remove_job_from_table(pi); /* FG job shouldn't be in job table */
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010701 return checkjobs_and_fg_shell(pi);
10702 }
10703 return EXIT_SUCCESS;
10704}
10705#endif
10706
Denys Vlasenko1125d7d2017-01-08 17:19:38 +010010707#if ENABLE_HUSH_KILL
10708static int FAST_FUNC builtin_kill(char **argv)
10709{
10710 int ret = 0;
10711
Denys Vlasenkofd68f1e2017-01-09 05:47:57 +010010712# if ENABLE_HUSH_JOB
10713 if (argv[1] && strcmp(argv[1], "-l") != 0) {
10714 int i = 1;
Denys Vlasenko1125d7d2017-01-08 17:19:38 +010010715
10716 do {
10717 struct pipe *pi;
10718 char *dst;
10719 int j, n;
10720
10721 if (argv[i][0] != '%')
10722 continue;
10723 /*
10724 * "kill %N" - job kill
10725 * Converting to pgrp / pid kill
10726 */
10727 pi = parse_jobspec(argv[i]);
10728 if (!pi) {
10729 /* Eat bad jobspec */
10730 j = i;
10731 do {
10732 j++;
10733 argv[j - 1] = argv[j];
10734 } while (argv[j]);
10735 ret = 1;
10736 i--;
10737 continue;
10738 }
10739 /*
10740 * In jobs started under job control, we signal
10741 * entire process group by kill -PGRP_ID.
10742 * This happens, f.e., in interactive shell.
10743 *
10744 * Otherwise, we signal each child via
10745 * kill PID1 PID2 PID3.
10746 * Testcases:
10747 * sh -c 'sleep 1|sleep 1 & kill %1'
10748 * sh -c 'true|sleep 2 & sleep 1; kill %1'
10749 * sh -c 'true|sleep 1 & sleep 2; kill %1'
10750 */
Denys Vlasenko5362cc42017-01-09 05:57:13 +010010751 n = G_interactive_fd ? 1 : pi->num_cmds;
Denys Vlasenko1125d7d2017-01-08 17:19:38 +010010752 dst = alloca(n * sizeof(int)*4);
10753 argv[i] = dst;
Denys Vlasenko1125d7d2017-01-08 17:19:38 +010010754 if (G_interactive_fd)
10755 dst += sprintf(dst, " -%u", (int)pi->pgrp);
Denys Vlasenkofd68f1e2017-01-09 05:47:57 +010010756 else for (j = 0; j < n; j++) {
Denys Vlasenko1125d7d2017-01-08 17:19:38 +010010757 struct command *cmd = &pi->cmds[j];
10758 /* Skip exited members of the job */
10759 if (cmd->pid == 0)
10760 continue;
10761 /*
10762 * kill_main has matching code to expect
10763 * leading space. Needed to not confuse
10764 * negative pids with "kill -SIGNAL_NO" syntax
10765 */
10766 dst += sprintf(dst, " %u", (int)cmd->pid);
10767 }
10768 *dst = '\0';
10769 } while (argv[++i]);
10770 }
Denys Vlasenkofd68f1e2017-01-09 05:47:57 +010010771# endif
Denys Vlasenko1125d7d2017-01-08 17:19:38 +010010772
Denys Vlasenkofd68f1e2017-01-09 05:47:57 +010010773 if (argv[1] || ret == 0) {
Denys Vlasenko1125d7d2017-01-08 17:19:38 +010010774 ret = run_applet_main(argv, kill_main);
10775 }
Denys Vlasenkofd68f1e2017-01-09 05:47:57 +010010776 /* else: ret = 1, "kill %bad_jobspec" case */
Denys Vlasenko1125d7d2017-01-08 17:19:38 +010010777 return ret;
10778}
10779#endif
10780
10781#if ENABLE_HUSH_WAIT
Mike Frysinger56bdea12009-03-28 20:01:58 +000010782/* http://www.opengroup.org/onlinepubs/9699919799/utilities/wait.html */
Denys Vlasenko62b717b2016-11-07 22:12:18 +010010783#if !ENABLE_HUSH_JOB
10784# define wait_for_child_or_signal(pipe,pid) wait_for_child_or_signal(pid)
10785#endif
10786static int wait_for_child_or_signal(struct pipe *waitfor_pipe, pid_t waitfor_pid)
Denys Vlasenko7e675362016-10-28 21:57:31 +020010787{
10788 int ret = 0;
10789 for (;;) {
10790 int sig;
Denys Vlasenko62b717b2016-11-07 22:12:18 +010010791 sigset_t oldset;
Denys Vlasenko7e675362016-10-28 21:57:31 +020010792
Denys Vlasenko830ea352016-11-08 04:59:11 +010010793 if (!sigisemptyset(&G.pending_set))
10794 goto check_sig;
10795
Denys Vlasenko7e675362016-10-28 21:57:31 +020010796 /* waitpid is not interruptible by SA_RESTARTed
10797 * signals which we use. Thus, this ugly dance:
10798 */
10799
10800 /* Make sure possible SIGCHLD is stored in kernel's
10801 * pending signal mask before we call waitpid.
10802 * Or else we may race with SIGCHLD, lose it,
Denys Vlasenko62b717b2016-11-07 22:12:18 +010010803 * and get stuck in sigsuspend...
Denys Vlasenko7e675362016-10-28 21:57:31 +020010804 */
Denys Vlasenko62b717b2016-11-07 22:12:18 +010010805 sigfillset(&oldset); /* block all signals, remember old set */
10806 sigprocmask(SIG_SETMASK, &oldset, &oldset);
Denys Vlasenko7e675362016-10-28 21:57:31 +020010807
10808 if (!sigisemptyset(&G.pending_set)) {
10809 /* Crap! we raced with some signal! */
Denys Vlasenko7e675362016-10-28 21:57:31 +020010810 goto restore;
10811 }
10812
10813 /*errno = 0; - checkjobs does this */
Denys Vlasenko62b717b2016-11-07 22:12:18 +010010814/* Can't pass waitfor_pipe into checkjobs(): it won't be interruptible */
Denys Vlasenko7e675362016-10-28 21:57:31 +020010815 ret = checkjobs(NULL, waitfor_pid); /* waitpid(WNOHANG) inside */
Denys Vlasenko62b717b2016-11-07 22:12:18 +010010816 debug_printf_exec("checkjobs:%d\n", ret);
10817#if ENABLE_HUSH_JOB
10818 if (waitfor_pipe) {
10819 int rcode = job_exited_or_stopped(waitfor_pipe);
10820 debug_printf_exec("job_exited_or_stopped:%d\n", rcode);
10821 if (rcode >= 0) {
10822 ret = rcode;
10823 sigprocmask(SIG_SETMASK, &oldset, NULL);
10824 break;
10825 }
10826 }
10827#endif
Denys Vlasenko7e675362016-10-28 21:57:31 +020010828 /* if ECHILD, there are no children (ret is -1 or 0) */
10829 /* if ret == 0, no children changed state */
10830 /* if ret != 0, it's exitcode+1 of exited waitfor_pid child */
Denys Vlasenko62b717b2016-11-07 22:12:18 +010010831 if (errno == ECHILD || ret) {
10832 ret--;
10833 if (ret < 0) /* if ECHILD, may need to fix "ret" */
Denys Vlasenko7e675362016-10-28 21:57:31 +020010834 ret = 0;
10835 sigprocmask(SIG_SETMASK, &oldset, NULL);
10836 break;
10837 }
Denys Vlasenko7e675362016-10-28 21:57:31 +020010838 /* Wait for SIGCHLD or any other signal */
Denys Vlasenko7e675362016-10-28 21:57:31 +020010839 /* It is vitally important for sigsuspend that SIGCHLD has non-DFL handler! */
10840 /* Note: sigsuspend invokes signal handler */
10841 sigsuspend(&oldset);
10842 restore:
10843 sigprocmask(SIG_SETMASK, &oldset, NULL);
Denys Vlasenko830ea352016-11-08 04:59:11 +010010844 check_sig:
Denys Vlasenko7e675362016-10-28 21:57:31 +020010845 /* So, did we get a signal? */
Denys Vlasenko7e675362016-10-28 21:57:31 +020010846 sig = check_and_run_traps();
10847 if (sig /*&& sig != SIGCHLD - always true */) {
Denys Vlasenko7c40ddd2017-08-02 16:37:39 +020010848 /* Do this for any (non-ignored) signal, not only for ^C */
Denys Vlasenko7e675362016-10-28 21:57:31 +020010849 ret = 128 + sig;
10850 break;
10851 }
10852 /* SIGCHLD, or no signal, or ignored one, such as SIGQUIT. Repeat */
10853 }
10854 return ret;
10855}
10856
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +020010857static int FAST_FUNC builtin_wait(char **argv)
Mike Frysinger56bdea12009-03-28 20:01:58 +000010858{
Denys Vlasenko7e675362016-10-28 21:57:31 +020010859 int ret;
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +020010860 int status;
Mike Frysinger56bdea12009-03-28 20:01:58 +000010861
Denys Vlasenkob131cce2010-05-20 03:39:43 +020010862 argv = skip_dash_dash(argv);
10863 if (argv[0] == NULL) {
Denis Vlasenko7566bae2009-03-31 17:24:49 +000010864 /* Don't care about wait results */
10865 /* Note 1: must wait until there are no more children */
10866 /* Note 2: must be interruptible */
10867 /* Examples:
10868 * $ sleep 3 & sleep 6 & wait
10869 * [1] 30934 sleep 3
10870 * [2] 30935 sleep 6
10871 * [1] Done sleep 3
10872 * [2] Done sleep 6
10873 * $ sleep 3 & sleep 6 & wait
10874 * [1] 30936 sleep 3
10875 * [2] 30937 sleep 6
10876 * [1] Done sleep 3
10877 * ^C <-- after ~4 sec from keyboard
10878 * $
10879 */
Denys Vlasenko62b717b2016-11-07 22:12:18 +010010880 return wait_for_child_or_signal(NULL, 0 /*(no job and no pid to wait for)*/);
Denis Vlasenko7566bae2009-03-31 17:24:49 +000010881 }
Mike Frysinger56bdea12009-03-28 20:01:58 +000010882
Denys Vlasenko7e675362016-10-28 21:57:31 +020010883 do {
Denis Vlasenkod5762932009-03-31 11:22:57 +000010884 pid_t pid = bb_strtou(*argv, NULL, 10);
Denys Vlasenko7e675362016-10-28 21:57:31 +020010885 if (errno || pid <= 0) {
Denys Vlasenko62b717b2016-11-07 22:12:18 +010010886#if ENABLE_HUSH_JOB
10887 if (argv[0][0] == '%') {
Denys Vlasenko02affb42016-11-08 00:59:29 +010010888 struct pipe *wait_pipe;
Denys Vlasenkod5b5c2f2017-01-08 15:46:04 +010010889 ret = 127; /* bash compat for bad jobspecs */
Denys Vlasenko62b717b2016-11-07 22:12:18 +010010890 wait_pipe = parse_jobspec(*argv);
10891 if (wait_pipe) {
Denys Vlasenko02affb42016-11-08 00:59:29 +010010892 ret = job_exited_or_stopped(wait_pipe);
Denys Vlasenko2ed74e22017-07-14 19:58:46 +020010893 if (ret < 0) {
Denys Vlasenko02affb42016-11-08 00:59:29 +010010894 ret = wait_for_child_or_signal(wait_pipe, 0);
Denys Vlasenko2ed74e22017-07-14 19:58:46 +020010895 } else {
10896 /* waiting on "last dead job" removes it */
10897 clean_up_last_dead_job();
Denys Vlasenko13102632017-07-08 00:24:32 +020010898 }
Denys Vlasenko62b717b2016-11-07 22:12:18 +010010899 }
Denys Vlasenkod5b5c2f2017-01-08 15:46:04 +010010900 /* else: parse_jobspec() already emitted error msg */
10901 continue;
Denys Vlasenko62b717b2016-11-07 22:12:18 +010010902 }
10903#endif
Denis Vlasenkod5762932009-03-31 11:22:57 +000010904 /* mimic bash message */
10905 bb_error_msg("wait: '%s': not a pid or valid job spec", *argv);
Denys Vlasenko9db74e42016-10-28 22:39:12 +020010906 ret = EXIT_FAILURE;
10907 continue; /* bash checks all argv[] */
Denis Vlasenkod5762932009-03-31 11:22:57 +000010908 }
Denys Vlasenko02affb42016-11-08 00:59:29 +010010909
Denys Vlasenko7e675362016-10-28 21:57:31 +020010910 /* Do we have such child? */
10911 ret = waitpid(pid, &status, WNOHANG);
10912 if (ret < 0) {
10913 /* No */
Denys Vlasenko840a4352017-07-07 22:56:02 +020010914 ret = 127;
Denys Vlasenko7e675362016-10-28 21:57:31 +020010915 if (errno == ECHILD) {
Denys Vlasenko0c5657e2017-07-14 19:27:03 +020010916 if (pid == G.last_bg_pid) {
Denys Vlasenko9db74e42016-10-28 22:39:12 +020010917 /* "wait $!" but last bg task has already exited. Try:
10918 * (sleep 1; exit 3) & sleep 2; echo $?; wait $!; echo $?
10919 * In bash it prints exitcode 0, then 3.
Denys Vlasenko26ad94b2016-11-07 23:07:21 +010010920 * In dash, it is 127.
Denys Vlasenko9db74e42016-10-28 22:39:12 +020010921 */
Denys Vlasenko840a4352017-07-07 22:56:02 +020010922 ret = G.last_bg_pid_exitcode;
Denys Vlasenko26ad94b2016-11-07 23:07:21 +010010923 } else {
10924 /* Example: "wait 1". mimic bash message */
10925 bb_error_msg("wait: pid %d is not a child of this shell", (int)pid);
Denys Vlasenko9db74e42016-10-28 22:39:12 +020010926 }
Denys Vlasenko7e675362016-10-28 21:57:31 +020010927 } else {
10928 /* ??? */
10929 bb_perror_msg("wait %s", *argv);
10930 }
Denys Vlasenko9db74e42016-10-28 22:39:12 +020010931 continue; /* bash checks all argv[] */
10932 }
10933 if (ret == 0) {
Denys Vlasenko7e675362016-10-28 21:57:31 +020010934 /* Yes, and it still runs */
Denys Vlasenko02affb42016-11-08 00:59:29 +010010935 ret = wait_for_child_or_signal(NULL, pid);
Denys Vlasenko7e675362016-10-28 21:57:31 +020010936 } else {
10937 /* Yes, and it just exited */
Denys Vlasenko02affb42016-11-08 00:59:29 +010010938 process_wait_result(NULL, pid, status);
Denys Vlasenko85378cd2015-10-11 21:47:11 +020010939 ret = WEXITSTATUS(status);
Mike Frysinger56bdea12009-03-28 20:01:58 +000010940 if (WIFSIGNALED(status))
10941 ret = 128 + WTERMSIG(status);
Mike Frysinger56bdea12009-03-28 20:01:58 +000010942 }
Denys Vlasenko9db74e42016-10-28 22:39:12 +020010943 } while (*++argv);
Mike Frysinger56bdea12009-03-28 20:01:58 +000010944
10945 return ret;
10946}
Denys Vlasenko1125d7d2017-01-08 17:19:38 +010010947#endif
Mike Frysinger56bdea12009-03-28 20:01:58 +000010948
Denis Vlasenko3d40d8e2009-04-17 23:44:18 +000010949#if ENABLE_HUSH_LOOPS || ENABLE_HUSH_FUNCTIONS
10950static unsigned parse_numeric_argv1(char **argv, unsigned def, unsigned def_min)
10951{
10952 if (argv[1]) {
10953 def = bb_strtou(argv[1], NULL, 10);
10954 if (errno || def < def_min || argv[2]) {
10955 bb_error_msg("%s: bad arguments", argv[0]);
10956 def = UINT_MAX;
10957 }
10958 }
10959 return def;
10960}
10961#endif
10962
Denis Vlasenkodadfb492008-07-29 10:16:05 +000010963#if ENABLE_HUSH_LOOPS
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +020010964static int FAST_FUNC builtin_break(char **argv)
Denis Vlasenkobcb25532008-07-28 23:04:34 +000010965{
Denis Vlasenko3d40d8e2009-04-17 23:44:18 +000010966 unsigned depth;
Denis Vlasenko87a86552008-07-29 19:43:10 +000010967 if (G.depth_of_loop == 0) {
Denis Vlasenko4f504a92008-07-29 19:48:30 +000010968 bb_error_msg("%s: only meaningful in a loop", argv[0]);
Denys Vlasenko49117b42016-07-21 14:40:08 +020010969 /* if we came from builtin_continue(), need to undo "= 1" */
10970 G.flag_break_continue = 0;
Denis Vlasenkofcf37c32008-07-29 11:37:15 +000010971 return EXIT_SUCCESS; /* bash compat */
10972 }
Denys Vlasenko49117b42016-07-21 14:40:08 +020010973 G.flag_break_continue++; /* BC_BREAK = 1, or BC_CONTINUE = 2 */
Denis Vlasenko3d40d8e2009-04-17 23:44:18 +000010974
10975 G.depth_break_continue = depth = parse_numeric_argv1(argv, 1, 1);
10976 if (depth == UINT_MAX)
10977 G.flag_break_continue = BC_BREAK;
10978 if (G.depth_of_loop < depth)
Denis Vlasenko87a86552008-07-29 19:43:10 +000010979 G.depth_break_continue = G.depth_of_loop;
Denis Vlasenko3d40d8e2009-04-17 23:44:18 +000010980
Denis Vlasenkobcb25532008-07-28 23:04:34 +000010981 return EXIT_SUCCESS;
10982}
10983
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +020010984static int FAST_FUNC builtin_continue(char **argv)
Denis Vlasenkobcb25532008-07-28 23:04:34 +000010985{
Denis Vlasenko4f504a92008-07-29 19:48:30 +000010986 G.flag_break_continue = 1; /* BC_CONTINUE = 2 = 1+1 */
10987 return builtin_break(argv);
Denis Vlasenkobcb25532008-07-28 23:04:34 +000010988}
Denis Vlasenkodadfb492008-07-29 10:16:05 +000010989#endif
Denis Vlasenko3d40d8e2009-04-17 23:44:18 +000010990
10991#if ENABLE_HUSH_FUNCTIONS
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +020010992static int FAST_FUNC builtin_return(char **argv)
Denis Vlasenko3d40d8e2009-04-17 23:44:18 +000010993{
10994 int rc;
10995
Denys Vlasenko04b46bc2016-10-01 22:28:03 +020010996 if (G_flag_return_in_progress != -1) {
Denis Vlasenko3d40d8e2009-04-17 23:44:18 +000010997 bb_error_msg("%s: not in a function or sourced script", argv[0]);
10998 return EXIT_FAILURE; /* bash compat */
10999 }
11000
Denys Vlasenko04b46bc2016-10-01 22:28:03 +020011001 G_flag_return_in_progress = 1;
Denis Vlasenko3d40d8e2009-04-17 23:44:18 +000011002
11003 /* bash:
11004 * out of range: wraps around at 256, does not error out
11005 * non-numeric param:
11006 * f() { false; return qwe; }; f; echo $?
11007 * bash: return: qwe: numeric argument required <== we do this
11008 * 255 <== we also do this
11009 */
11010 rc = parse_numeric_argv1(argv, G.last_exitcode, 0);
11011 return rc;
11012}
11013#endif
Denys Vlasenkoa1184af2017-01-10 15:58:02 +010011014
Denys Vlasenko11f2e992017-08-10 16:34:03 +020011015#if ENABLE_HUSH_TIMES
11016static int FAST_FUNC builtin_times(char **argv UNUSED_PARAM)
11017{
11018 static const uint8_t times_tbl[] ALIGN1 = {
11019 ' ', offsetof(struct tms, tms_utime),
11020 '\n', offsetof(struct tms, tms_stime),
11021 ' ', offsetof(struct tms, tms_cutime),
11022 '\n', offsetof(struct tms, tms_cstime),
11023 0
11024 };
11025 const uint8_t *p;
11026 unsigned clk_tck;
11027 struct tms buf;
11028
11029 clk_tck = bb_clk_tck();
11030
11031 times(&buf);
11032 p = times_tbl;
11033 do {
11034 unsigned sec, frac;
11035 unsigned long t;
11036 t = *(clock_t *)(((char *) &buf) + p[1]);
11037 sec = t / clk_tck;
11038 frac = t % clk_tck;
11039 printf("%um%u.%03us%c",
11040 sec / 60, sec % 60,
11041 (frac * 1000) / clk_tck,
11042 p[0]);
11043 p += 2;
11044 } while (*p);
11045
11046 return EXIT_SUCCESS;
11047}
11048#endif
11049
Denys Vlasenkoa1184af2017-01-10 15:58:02 +010011050#if ENABLE_HUSH_MEMLEAK
11051static int FAST_FUNC builtin_memleak(char **argv UNUSED_PARAM)
11052{
11053 void *p;
11054 unsigned long l;
11055
11056# ifdef M_TRIM_THRESHOLD
11057 /* Optional. Reduces probability of false positives */
11058 malloc_trim(0);
11059# endif
11060 /* Crude attempt to find where "free memory" starts,
11061 * sans fragmentation. */
11062 p = malloc(240);
11063 l = (unsigned long)p;
11064 free(p);
11065 p = malloc(3400);
11066 if (l < (unsigned long)p) l = (unsigned long)p;
11067 free(p);
11068
11069
11070# if 0 /* debug */
11071 {
11072 struct mallinfo mi = mallinfo();
11073 printf("top alloc:0x%lx malloced:%d+%d=%d\n", l,
11074 mi.arena, mi.hblkhd, mi.arena + mi.hblkhd);
11075 }
11076# endif
11077
11078 if (!G.memleak_value)
11079 G.memleak_value = l;
11080
11081 l -= G.memleak_value;
11082 if ((long)l < 0)
11083 l = 0;
11084 l /= 1024;
11085 if (l > 127)
11086 l = 127;
11087
11088 /* Exitcode is "how many kilobytes we leaked since 1st call" */
11089 return l;
11090}
11091#endif