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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
50 * builtins mandated by standards we don't support:
Denys Vlasenko74d40582017-08-11 01:32:46 +020051 * [un]alias, command, fc:
Denys Vlasenko203fd7b2017-07-17 16:13:35 +020052 * command -v CMD: print "/path/to/CMD"
53 * prints "CMD" for builtins
54 * prints "alias ALIAS='EXPANSION'" for aliases
55 * prints nothing and sets $? to 1 if not found
56 * command -V CMD: print "CMD is /path/CMD|a shell builtin|etc"
57 * command [-p] CMD: run CMD, even if a function CMD also exists
58 * (can use this to override standalone shell as well)
59 * -p: use default $PATH
Denys Vlasenko1e660422017-07-17 21:10:50 +020060 * command BLTIN: disables special-ness (e.g. errors do not abort)
Denys Vlasenko203fd7b2017-07-17 16:13:35 +020061 * fc -l[nr] [BEG] [END]: list range of commands in history
62 * fc [-e EDITOR] [BEG] [END]: edit/rerun range of commands
63 * fc -s [PAT=REP] [CMD]: rerun CMD, replacing PAT with REP
Mike Frysinger25a6ca02009-03-28 13:59:26 +000064 *
Denys Vlasenkoadc0e202010-05-17 18:56:58 +020065 * Bash compat TODO:
66 * redirection of stdout+stderr: &> and >&
Denys Vlasenkoadc0e202010-05-17 18:56:58 +020067 * reserved words: function select
68 * advanced test: [[ ]]
Denys Vlasenkoadc0e202010-05-17 18:56:58 +020069 * process substitution: <(list) and >(list)
70 * =~: regex operator
Denys Vlasenko9ca656b2009-06-10 13:39:35 +020071 * let EXPR [EXPR...]
Denys Vlasenko349ef962010-05-21 15:46:24 +020072 * Each EXPR is an arithmetic expression (ARITHMETIC EVALUATION)
73 * If the last arg evaluates to 0, let returns 1; 0 otherwise.
74 * NB: let `echo 'a=a + 1'` - error (IOW: multi-word expansion is used)
Denys Vlasenko9ca656b2009-06-10 13:39:35 +020075 * ((EXPR))
Denys Vlasenko349ef962010-05-21 15:46:24 +020076 * The EXPR is evaluated according to ARITHMETIC EVALUATION.
77 * This is exactly equivalent to let "EXPR".
Denys Vlasenkoadc0e202010-05-17 18:56:58 +020078 * $[EXPR]: synonym for $((EXPR))
Denys Vlasenko203fd7b2017-07-17 16:13:35 +020079 * indirect expansion: ${!VAR}
80 * substring op on @: ${@:n:m}
Denys Vlasenkobbecd742010-10-03 17:22:52 +020081 *
82 * Won't do:
Denys Vlasenko203fd7b2017-07-17 16:13:35 +020083 * Some builtins mandated by standards:
84 * newgrp [GRP]: not a builtin in bash but a suid binary
85 * which spawns a new shell with new group ID
Denys Vlasenkobbecd742010-10-03 17:22:52 +020086 * In bash, export builtin is special, its arguments are assignments
Denys Vlasenko08218012009-06-03 14:43:56 +020087 * and therefore expansion of them should be "one-word" expansion:
88 * $ export i=`echo 'a b'` # export has one arg: "i=a b"
89 * compare with:
90 * $ ls i=`echo 'a b'` # ls has two args: "i=a" and "b"
91 * ls: cannot access i=a: No such file or directory
92 * ls: cannot access b: No such file or directory
Denys Vlasenko9ca656b2009-06-10 13:39:35 +020093 * Note1: same applies to local builtin.
Denys Vlasenko08218012009-06-03 14:43:56 +020094 * Note2: bash 3.2.33(1) does this only if export word itself
95 * is not quoted:
96 * $ export i=`echo 'aaa bbb'`; echo "$i"
97 * aaa bbb
98 * $ "export" i=`echo 'aaa bbb'`; echo "$i"
99 * aaa
Eric Andersen25f27032001-04-26 23:22:31 +0000100 */
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200101//config:config HUSH
Denys Vlasenko4eed2c62017-07-18 22:01:24 +0200102//config: bool "hush (64 kb)"
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200103//config: default y
104//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +0200105//config: hush is a small shell. It handles the normal flow control
106//config: constructs such as if/then/elif/else/fi, for/in/do/done, while loops,
107//config: case/esac. Redirections, here documents, $((arithmetic))
108//config: and functions are supported.
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200109//config:
Denys Vlasenko72089cf2017-07-21 09:50:55 +0200110//config: It will compile and work on no-mmu systems.
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200111//config:
Denys Vlasenko72089cf2017-07-21 09:50:55 +0200112//config: It does not handle select, aliases, tilde expansion,
113//config: &>file and >&file redirection of stdout+stderr.
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200114//config:
115//config:config HUSH_BASH_COMPAT
116//config: bool "bash-compatible extensions"
117//config: default y
Denys Vlasenko0b883582016-12-23 16:49:07 +0100118//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200119//config:
Denys Vlasenko9e800222010-10-03 14:28:04 +0200120//config:config HUSH_BRACE_EXPANSION
121//config: bool "Brace expansion"
122//config: default y
123//config: depends on HUSH_BASH_COMPAT
124//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +0200125//config: Enable {abc,def} extension.
Denys Vlasenko9e800222010-10-03 14:28:04 +0200126//config:
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200127//config:config HUSH_INTERACTIVE
128//config: bool "Interactive mode"
129//config: default y
Denys Vlasenko0b883582016-12-23 16:49:07 +0100130//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200131//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +0200132//config: Enable interactive mode (prompt and command editing).
133//config: Without this, hush simply reads and executes commands
134//config: from stdin just like a shell script from a file.
135//config: No prompt, no PS1/PS2 magic shell variables.
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200136//config:
Denys Vlasenko99862cb2010-09-12 17:34:13 +0200137//config:config HUSH_SAVEHISTORY
138//config: bool "Save command history to .hush_history"
139//config: default y
140//config: depends on HUSH_INTERACTIVE && FEATURE_EDITING_SAVEHISTORY
Denys Vlasenko99862cb2010-09-12 17:34:13 +0200141//config:
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200142//config:config HUSH_JOB
143//config: bool "Job control"
144//config: default y
145//config: depends on HUSH_INTERACTIVE
146//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +0200147//config: Enable job control: Ctrl-Z backgrounds, Ctrl-C interrupts current
148//config: command (not entire shell), fg/bg builtins work. Without this option,
149//config: "cmd &" still works by simply spawning a process and immediately
150//config: prompting for next command (or executing next command in a script),
151//config: but no separate process group is formed.
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200152//config:
153//config:config HUSH_TICK
Denys Vlasenkof5604222017-01-10 14:58:54 +0100154//config: bool "Support process substitution"
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200155//config: default y
Denys Vlasenko0b883582016-12-23 16:49:07 +0100156//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200157//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +0200158//config: Enable `command` and $(command).
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200159//config:
160//config:config HUSH_IF
161//config: bool "Support if/then/elif/else/fi"
162//config: default y
Denys Vlasenko0b883582016-12-23 16:49:07 +0100163//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200164//config:
165//config:config HUSH_LOOPS
166//config: bool "Support for, while and until loops"
167//config: default y
Denys Vlasenko0b883582016-12-23 16:49:07 +0100168//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200169//config:
170//config:config HUSH_CASE
171//config: bool "Support case ... esac statement"
172//config: default y
Denys Vlasenko0b883582016-12-23 16:49:07 +0100173//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200174//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +0200175//config: Enable case ... esac statement. +400 bytes.
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200176//config:
177//config:config HUSH_FUNCTIONS
178//config: bool "Support funcname() { commands; } syntax"
179//config: default y
Denys Vlasenko0b883582016-12-23 16:49:07 +0100180//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200181//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +0200182//config: Enable support for shell functions. +800 bytes.
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200183//config:
184//config:config HUSH_LOCAL
Denys Vlasenko7a85c602017-01-08 17:40:18 +0100185//config: bool "local builtin"
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200186//config: default y
187//config: depends on HUSH_FUNCTIONS
188//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +0200189//config: Enable support for local variables in functions.
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200190//config:
191//config:config HUSH_RANDOM_SUPPORT
192//config: bool "Pseudorandom generator and $RANDOM variable"
193//config: default y
Denys Vlasenko0b883582016-12-23 16:49:07 +0100194//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200195//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +0200196//config: Enable pseudorandom generator and dynamic variable "$RANDOM".
197//config: Each read of "$RANDOM" will generate a new pseudorandom value.
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200198//config:
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200199//config:config HUSH_MODE_X
200//config: bool "Support 'hush -x' option and 'set -x' command"
201//config: default y
Denys Vlasenko0b883582016-12-23 16:49:07 +0100202//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200203//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +0200204//config: This instructs hush to print commands before execution.
205//config: Adds ~300 bytes.
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200206//config:
Denys Vlasenko1cc68042017-01-09 17:10:04 +0100207//config:config HUSH_ECHO
208//config: bool "echo builtin"
209//config: default y
210//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko1cc68042017-01-09 17:10:04 +0100211//config:
212//config:config HUSH_PRINTF
213//config: bool "printf builtin"
214//config: default y
215//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenkof5604222017-01-10 14:58:54 +0100216//config:
Denys Vlasenko265062d2017-01-10 15:13:30 +0100217//config:config HUSH_TEST
218//config: bool "test builtin"
219//config: default y
220//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
221//config:
Denys Vlasenkof5604222017-01-10 14:58:54 +0100222//config:config HUSH_HELP
223//config: bool "help builtin"
224//config: default y
225//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko1cc68042017-01-09 17:10:04 +0100226//config:
Denys Vlasenko6ec76d82017-01-08 18:40:41 +0100227//config:config HUSH_EXPORT
228//config: bool "export builtin"
229//config: default y
230//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko6ec76d82017-01-08 18:40:41 +0100231//config:
232//config:config HUSH_EXPORT_N
233//config: bool "Support 'export -n' option"
234//config: default y
235//config: depends on HUSH_EXPORT
236//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +0200237//config: export -n unexports variables. It is a bash extension.
Denys Vlasenko6ec76d82017-01-08 18:40:41 +0100238//config:
Denys Vlasenko1e660422017-07-17 21:10:50 +0200239//config:config HUSH_READONLY
240//config: bool "readonly builtin"
241//config: default y
Denys Vlasenko6b0695b2017-07-17 21:47:27 +0200242//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko1e660422017-07-17 21:10:50 +0200243//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +0200244//config: Enable support for read-only variables.
Denys Vlasenko1e660422017-07-17 21:10:50 +0200245//config:
Denys Vlasenko7a85c602017-01-08 17:40:18 +0100246//config:config HUSH_KILL
Denys Vlasenkof5604222017-01-10 14:58:54 +0100247//config: bool "kill builtin (supports kill %jobspec)"
Denys Vlasenko7a85c602017-01-08 17:40:18 +0100248//config: default y
249//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko7a85c602017-01-08 17:40:18 +0100250//config:
251//config:config HUSH_WAIT
252//config: bool "wait builtin"
253//config: default y
254//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko7a85c602017-01-08 17:40:18 +0100255//config:
256//config:config HUSH_TRAP
257//config: bool "trap builtin"
258//config: default y
259//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko7a85c602017-01-08 17:40:18 +0100260//config:
261//config:config HUSH_TYPE
262//config: bool "type builtin"
263//config: default y
264//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko7a85c602017-01-08 17:40:18 +0100265//config:
Denys Vlasenko11f2e992017-08-10 16:34:03 +0200266//config:config HUSH_TIMES
267//config: bool "times builtin"
268//config: default y
269//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
270//config:
Denys Vlasenko7a85c602017-01-08 17:40:18 +0100271//config:config HUSH_READ
272//config: bool "read builtin"
273//config: default y
274//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko7a85c602017-01-08 17:40:18 +0100275//config:
Denys Vlasenko10d5ece2017-01-08 18:28:43 +0100276//config:config HUSH_SET
277//config: bool "set builtin"
278//config: default y
279//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko10d5ece2017-01-08 18:28:43 +0100280//config:
281//config:config HUSH_UNSET
282//config: bool "unset builtin"
283//config: default y
284//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenkof5604222017-01-10 14:58:54 +0100285//config:
286//config:config HUSH_ULIMIT
287//config: bool "ulimit builtin"
288//config: default y
289//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko10d5ece2017-01-08 18:28:43 +0100290//config:
Denys Vlasenkod5933b12017-01-08 18:31:39 +0100291//config:config HUSH_UMASK
292//config: bool "umask builtin"
293//config: default y
294//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenkod5933b12017-01-08 18:31:39 +0100295//config:
Denys Vlasenko74d40582017-08-11 01:32:46 +0200296//config:config HUSH_GETOPTS
297//config: bool "getopts builtin"
298//config: default y
299//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
300//config:
Denys Vlasenko44719692017-01-08 18:44:41 +0100301//config:config HUSH_MEMLEAK
302//config: bool "memleak builtin (debugging)"
303//config: default n
304//config: depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH
Denys Vlasenko202a2d12010-07-16 12:36:14 +0200305
Denys Vlasenko20704f02011-03-23 17:59:27 +0100306//applet:IF_HUSH(APPLET(hush, BB_DIR_BIN, BB_SUID_DROP))
Denys Vlasenko205d48e2017-01-29 14:57:33 +0100307// APPLET_ODDNAME:name main location suid_type help
Denys Vlasenko205d48e2017-01-29 14:57:33 +0100308//applet:IF_SH_IS_HUSH( APPLET_ODDNAME(sh, hush, BB_DIR_BIN, BB_SUID_DROP, hush))
Denys Vlasenko0b883582016-12-23 16:49:07 +0100309//applet:IF_BASH_IS_HUSH(APPLET_ODDNAME(bash, hush, BB_DIR_BIN, BB_SUID_DROP, hush))
Denys Vlasenko20704f02011-03-23 17:59:27 +0100310
311//kbuild:lib-$(CONFIG_HUSH) += hush.o match.o shell_common.o
Denys Vlasenko0b883582016-12-23 16:49:07 +0100312//kbuild:lib-$(CONFIG_SH_IS_HUSH) += hush.o match.o shell_common.o
313//kbuild:lib-$(CONFIG_BASH_IS_HUSH) += hush.o match.o shell_common.o
Denys Vlasenko20704f02011-03-23 17:59:27 +0100314//kbuild:lib-$(CONFIG_HUSH_RANDOM_SUPPORT) += random.o
315
Dan Fandrich89ca2f92010-11-28 01:54:39 +0100316/* -i (interactive) and -s (read stdin) are also accepted,
317 * but currently do nothing, therefore aren't shown in help.
318 * NOMMU-specific options are not meant to be used by users,
319 * therefore we don't show them either.
320 */
321//usage:#define hush_trivial_usage
Denys Vlasenko9fda6092017-07-14 13:36:48 +0200322//usage: "[-enxl] [-c 'SCRIPT' [ARG0 [ARGS]] / FILE [ARGS]]"
Denys Vlasenkob0b83432011-03-07 12:34:59 +0100323//usage:#define hush_full_usage "\n\n"
324//usage: "Unix shell interpreter"
325
Denys Vlasenko67047462016-12-22 15:21:58 +0100326#if !(defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) \
327 || defined(__APPLE__) \
328 )
329# include <malloc.h> /* for malloc_trim */
330#endif
331#include <glob.h>
332/* #include <dmalloc.h> */
333#if ENABLE_HUSH_CASE
334# include <fnmatch.h>
335#endif
Denys Vlasenko11f2e992017-08-10 16:34:03 +0200336#include <sys/times.h>
Denys Vlasenko67047462016-12-22 15:21:58 +0100337#include <sys/utsname.h> /* for setting $HOSTNAME */
338
339#include "busybox.h" /* for APPLET_IS_NOFORK/NOEXEC */
340#include "unicode.h"
341#include "shell_common.h"
342#include "math.h"
343#include "match.h"
344#if ENABLE_HUSH_RANDOM_SUPPORT
345# include "random.h"
346#else
347# define CLEAR_RANDOM_T(rnd) ((void)0)
348#endif
349#ifndef F_DUPFD_CLOEXEC
350# define F_DUPFD_CLOEXEC F_DUPFD
351#endif
352#ifndef PIPE_BUF
353# define PIPE_BUF 4096 /* amount of buffering in a pipe */
354#endif
355
Denis Vlasenko1943aec2009-04-09 14:15:57 +0000356
Kang-Che Sung027d3ab2017-01-11 14:18:15 +0100357/* So far, all bash compat is controlled by one config option */
358/* Separate defines document which part of code implements what */
359#define BASH_PATTERN_SUBST ENABLE_HUSH_BASH_COMPAT
360#define BASH_SUBSTR ENABLE_HUSH_BASH_COMPAT
Kang-Che Sung027d3ab2017-01-11 14:18:15 +0100361#define BASH_SOURCE ENABLE_HUSH_BASH_COMPAT
362#define BASH_HOSTNAME_VAR ENABLE_HUSH_BASH_COMPAT
Denys Vlasenko4ee824f2017-07-03 01:22:13 +0200363#define BASH_TEST2 (ENABLE_HUSH_BASH_COMPAT && ENABLE_HUSH_TEST)
Denys Vlasenko1f41c882017-08-09 13:52:36 +0200364#define BASH_READ_D ENABLE_HUSH_BASH_COMPAT
Kang-Che Sung027d3ab2017-01-11 14:18:15 +0100365
366
Denys Vlasenko8d7be232009-05-25 16:38:32 +0200367/* Build knobs */
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +0000368#define LEAK_HUNTING 0
369#define BUILD_AS_NOMMU 0
370/* Enable/disable sanity checks. Ok to enable in production,
371 * only adds a bit of bloat. Set to >1 to get non-production level verbosity.
372 * Keeping 1 for now even in released versions.
373 */
374#define HUSH_DEBUG 1
Denys Vlasenko8d7be232009-05-25 16:38:32 +0200375/* Slightly bigger (+200 bytes), but faster hush.
376 * So far it only enables a trick with counting SIGCHLDs and forks,
377 * which allows us to do fewer waitpid's.
378 * (we can detect a case where neither forks were done nor SIGCHLDs happened
379 * and therefore waitpid will return the same result as last time)
380 */
381#define ENABLE_HUSH_FAST 0
Denys Vlasenko9297dbc2010-07-05 21:37:12 +0200382/* TODO: implement simplified code for users which do not need ${var%...} ops
383 * So far ${var%...} ops are always enabled:
384 */
385#define ENABLE_HUSH_DOLLAR_OPS 1
Denis Vlasenko1943aec2009-04-09 14:15:57 +0000386
387
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +0000388#if BUILD_AS_NOMMU
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +0000389# undef BB_MMU
390# undef USE_FOR_NOMMU
391# undef USE_FOR_MMU
392# define BB_MMU 0
393# define USE_FOR_NOMMU(...) __VA_ARGS__
394# define USE_FOR_MMU(...)
395#endif
396
Denys Vlasenko1fcbff22010-06-26 02:40:08 +0200397#include "NUM_APPLETS.h"
Denys Vlasenko14974842010-03-23 01:08:26 +0100398#if NUM_APPLETS == 1
Denis Vlasenko61befda2008-11-25 01:36:03 +0000399/* STANDALONE does not make sense, and won't compile */
Denis Vlasenkoce4acbb2009-04-10 23:23:41 +0000400# undef CONFIG_FEATURE_SH_STANDALONE
401# undef ENABLE_FEATURE_SH_STANDALONE
Denis Vlasenko5e34ff22009-04-21 11:09:40 +0000402# undef IF_FEATURE_SH_STANDALONE
Denys Vlasenko14974842010-03-23 01:08:26 +0100403# undef IF_NOT_FEATURE_SH_STANDALONE
404# define ENABLE_FEATURE_SH_STANDALONE 0
Denis Vlasenko5e34ff22009-04-21 11:09:40 +0000405# define IF_FEATURE_SH_STANDALONE(...)
406# define IF_NOT_FEATURE_SH_STANDALONE(...) __VA_ARGS__
Denis Vlasenko61befda2008-11-25 01:36:03 +0000407#endif
408
Denis Vlasenko05743d72008-02-10 12:10:08 +0000409#if !ENABLE_HUSH_INTERACTIVE
Denis Vlasenkoce4acbb2009-04-10 23:23:41 +0000410# undef ENABLE_FEATURE_EDITING
411# define ENABLE_FEATURE_EDITING 0
412# undef ENABLE_FEATURE_EDITING_FANCY_PROMPT
413# define ENABLE_FEATURE_EDITING_FANCY_PROMPT 0
Denys Vlasenko8cab6672012-04-20 14:48:00 +0200414# undef ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
415# define ENABLE_FEATURE_EDITING_SAVE_ON_EXIT 0
Denis Vlasenko8412d792007-10-01 09:59:47 +0000416#endif
417
Denis Vlasenko424f79b2009-03-22 14:23:34 +0000418/* Do we support ANY keywords? */
419#if ENABLE_HUSH_IF || ENABLE_HUSH_LOOPS || ENABLE_HUSH_CASE
Denis Vlasenkoce4acbb2009-04-10 23:23:41 +0000420# define HAS_KEYWORDS 1
421# define IF_HAS_KEYWORDS(...) __VA_ARGS__
422# define IF_HAS_NO_KEYWORDS(...)
Denis Vlasenko424f79b2009-03-22 14:23:34 +0000423#else
Denis Vlasenkoce4acbb2009-04-10 23:23:41 +0000424# define HAS_KEYWORDS 0
425# define IF_HAS_KEYWORDS(...)
426# define IF_HAS_NO_KEYWORDS(...) __VA_ARGS__
Denis Vlasenko424f79b2009-03-22 14:23:34 +0000427#endif
Denis Vlasenko8412d792007-10-01 09:59:47 +0000428
Denis Vlasenkod01ff132007-05-02 21:40:23 +0000429/* If you comment out one of these below, it will be #defined later
430 * to perform debug printfs to stderr: */
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +0000431#define debug_printf(...) do {} while (0)
Denis Vlasenko400c5b62007-05-04 13:07:27 +0000432/* Finer-grained debug switches */
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +0000433#define debug_printf_parse(...) do {} while (0)
434#define debug_print_tree(a, b) do {} while (0)
435#define debug_printf_exec(...) do {} while (0)
Denis Vlasenkof886fd22008-10-13 12:36:05 +0000436#define debug_printf_env(...) do {} while (0)
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +0000437#define debug_printf_jobs(...) do {} while (0)
438#define debug_printf_expand(...) do {} while (0)
Denys Vlasenko1e811b12010-05-22 03:12:29 +0200439#define debug_printf_varexp(...) do {} while (0)
Denis Vlasenkob61e13d2008-06-17 05:11:43 +0000440#define debug_printf_glob(...) do {} while (0)
Denys Vlasenko2db74612017-07-07 22:07:28 +0200441#define debug_printf_redir(...) do {} while (0)
Denis Vlasenkob61e13d2008-06-17 05:11:43 +0000442#define debug_printf_list(...) do {} while (0)
Denis Vlasenko30c9cc52008-06-17 07:24:29 +0000443#define debug_printf_subst(...) do {} while (0)
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +0000444#define debug_printf_clean(...) do {} while (0)
Denis Vlasenkod01ff132007-05-02 21:40:23 +0000445
Denis Vlasenkob6e65562009-04-03 16:49:04 +0000446#define ERR_PTR ((void*)(long)1)
447
Denys Vlasenkod5b5c2f2017-01-08 15:46:04 +0100448#define JOB_STATUS_FORMAT "[%u] %-22s %.40s\n"
Denis Vlasenko5ec61322008-06-24 00:50:07 +0000449
Denys Vlasenkoe85248a2010-05-22 06:20:26 +0200450#define _SPECIAL_VARS_STR "_*@$!?#"
451#define SPECIAL_VARS_STR ("_*@$!?#" + 1)
452#define NUMERIC_SPECVARS_STR ("_*@$!?#" + 3)
Kang-Che Sung027d3ab2017-01-11 14:18:15 +0100453#if BASH_PATTERN_SUBST
Denys Vlasenko36f774a2010-09-05 14:45:38 +0200454/* Support / and // replace ops */
455/* Note that // is stored as \ in "encoded" string representation */
456# define VAR_ENCODED_SUBST_OPS "\\/%#:-=+?"
457# define VAR_SUBST_OPS ("\\/%#:-=+?" + 1)
458# define MINUS_PLUS_EQUAL_QUESTION ("\\/%#:-=+?" + 5)
459#else
460# define VAR_ENCODED_SUBST_OPS "%#:-=+?"
461# define VAR_SUBST_OPS "%#:-=+?"
462# define MINUS_PLUS_EQUAL_QUESTION ("%#:-=+?" + 3)
463#endif
Denys Vlasenkoe85248a2010-05-22 06:20:26 +0200464
465#define SPECIAL_VAR_SYMBOL 3
Eric Andersen25f27032001-04-26 23:22:31 +0000466
Denys Vlasenkocb6ff252009-05-04 00:14:30 +0200467struct variable;
468
Denis Vlasenkocc90f442009-04-08 16:40:34 +0000469static const char hush_version_str[] ALIGN1 = "HUSH_VERSION="BB_VER;
470
471/* This supports saving pointers malloced in vfork child,
Denis Vlasenkoc376db32009-04-15 21:49:48 +0000472 * to be freed in the parent.
Denis Vlasenkocc90f442009-04-08 16:40:34 +0000473 */
474#if !BB_MMU
475typedef struct nommu_save_t {
476 char **new_env;
Denys Vlasenkocb6ff252009-05-04 00:14:30 +0200477 struct variable *old_vars;
Denis Vlasenkocc90f442009-04-08 16:40:34 +0000478 char **argv;
Denis Vlasenko27014ed2009-04-15 21:48:23 +0000479 char **argv_from_re_execing;
Denis Vlasenkocc90f442009-04-08 16:40:34 +0000480} nommu_save_t;
481#endif
482
Denys Vlasenko9b782552010-09-08 13:33:26 +0200483enum {
Eric Andersen25f27032001-04-26 23:22:31 +0000484 RES_NONE = 0,
Denis Vlasenko06810332007-05-21 23:30:54 +0000485#if ENABLE_HUSH_IF
Denis Vlasenko17f02e72008-07-14 04:32:29 +0000486 RES_IF ,
487 RES_THEN ,
488 RES_ELIF ,
489 RES_ELSE ,
490 RES_FI ,
Denis Vlasenko06810332007-05-21 23:30:54 +0000491#endif
492#if ENABLE_HUSH_LOOPS
Denis Vlasenko17f02e72008-07-14 04:32:29 +0000493 RES_FOR ,
494 RES_WHILE ,
495 RES_UNTIL ,
496 RES_DO ,
497 RES_DONE ,
Denis Vlasenkod91afa32008-07-29 11:10:01 +0000498#endif
499#if ENABLE_HUSH_LOOPS || ENABLE_HUSH_CASE
Denis Vlasenko17f02e72008-07-14 04:32:29 +0000500 RES_IN ,
Denis Vlasenko06810332007-05-21 23:30:54 +0000501#endif
Denis Vlasenko17f02e72008-07-14 04:32:29 +0000502#if ENABLE_HUSH_CASE
503 RES_CASE ,
Denys Vlasenkoe9bda902009-05-23 16:50:07 +0200504 /* three pseudo-keywords support contrived "case" syntax: */
505 RES_CASE_IN, /* "case ... IN", turns into RES_MATCH when IN is observed */
506 RES_MATCH , /* "word)" */
507 RES_CASE_BODY, /* "this command is inside CASE" */
Denis Vlasenko17f02e72008-07-14 04:32:29 +0000508 RES_ESAC ,
509#endif
510 RES_XXXX ,
511 RES_SNTX
Denys Vlasenko9b782552010-09-08 13:33:26 +0200512};
Denis Vlasenkoc7985b72008-06-17 05:43:38 +0000513
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +0000514typedef struct o_string {
515 char *data;
516 int length; /* position where data is appended */
517 int maxlen;
Denys Vlasenko5b686cb2010-09-08 13:44:34 +0200518 int o_expflags;
Denis Vlasenko02d6f1a2009-04-07 19:56:55 +0000519 /* At least some part of the string was inside '' or "",
520 * possibly empty one: word"", wo''rd etc. */
Denys Vlasenko38292b62010-09-05 14:49:40 +0200521 smallint has_quoted_part;
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +0000522 smallint has_empty_slot;
523 smallint o_assignment; /* 0:maybe, 1:yes, 2:no */
524} o_string;
525enum {
Denys Vlasenko0e13b402010-09-21 12:35:39 +0200526 EXP_FLAG_SINGLEWORD = 0x80, /* must be 0x80 */
527 EXP_FLAG_GLOB = 0x2,
528 /* Protect newly added chars against globbing
529 * by prepending \ to *, ?, [, \ */
530 EXP_FLAG_ESC_GLOB_CHARS = 0x1,
531};
532enum {
533 MAYBE_ASSIGNMENT = 0,
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +0000534 DEFINITELY_ASSIGNMENT = 1,
Denys Vlasenko0e13b402010-09-21 12:35:39 +0200535 NOT_ASSIGNMENT = 2,
Maninder Singh97c64912015-05-25 13:46:36 +0200536 /* Not an assignment, but next word may be: "if v=xyz cmd;" */
Denys Vlasenko0e13b402010-09-21 12:35:39 +0200537 WORD_IS_KEYWORD = 3,
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +0000538};
539/* Used for initialization: o_string foo = NULL_O_STRING; */
540#define NULL_O_STRING { NULL }
541
Denys Vlasenko29f9b722011-05-14 11:27:36 +0200542#ifndef debug_printf_parse
543static const char *const assignment_flag[] = {
544 "MAYBE_ASSIGNMENT",
545 "DEFINITELY_ASSIGNMENT",
546 "NOT_ASSIGNMENT",
547 "WORD_IS_KEYWORD",
548};
549#endif
550
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +0000551typedef struct in_str {
552 const char *p;
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +0000553#if ENABLE_HUSH_INTERACTIVE
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +0000554 smallint promptmode; /* 0: PS1, 1: PS2 */
555#endif
Denys Vlasenkod17a91d2016-09-29 18:02:37 +0200556 int peek_buf[2];
Denys Vlasenkocecbc982011-03-30 18:54:52 +0200557 int last_char;
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +0000558 FILE *file;
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +0000559} in_str;
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +0000560
Denys Vlasenko764b2f02009-06-07 16:05:04 +0200561/* The descrip member of this structure is only used to make
562 * debugging output pretty */
563static const struct {
564 int mode;
565 signed char default_fd;
566 char descrip[3];
567} redir_table[] = {
568 { O_RDONLY, 0, "<" },
569 { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" },
570 { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" },
571 { O_CREAT|O_RDWR, 1, "<>" },
572 { O_RDONLY, 0, "<<" },
573/* Should not be needed. Bogus default_fd helps in debugging */
574/* { O_RDONLY, 77, "<<" }, */
575};
576
Eric Andersen25f27032001-04-26 23:22:31 +0000577struct redir_struct {
Denis Vlasenko55789c62008-06-18 16:30:42 +0000578 struct redir_struct *next;
Denis Vlasenko5ec61322008-06-24 00:50:07 +0000579 char *rd_filename; /* filename */
Denis Vlasenko02d6f1a2009-04-07 19:56:55 +0000580 int rd_fd; /* fd to redirect */
581 /* fd to redirect to, or -3 if rd_fd is to be closed (n>&-) */
582 int rd_dup;
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +0000583 smallint rd_type; /* (enum redir_type) */
584 /* note: for heredocs, rd_filename contains heredoc delimiter,
Denis Vlasenko02d6f1a2009-04-07 19:56:55 +0000585 * and subsequently heredoc itself; and rd_dup is a bitmask:
Denys Vlasenko764b2f02009-06-07 16:05:04 +0200586 * bit 0: do we need to trim leading tabs?
587 * bit 1: is heredoc quoted (<<'delim' syntax) ?
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +0000588 */
Eric Andersen25f27032001-04-26 23:22:31 +0000589};
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +0000590typedef enum redir_type {
Denys Vlasenko764b2f02009-06-07 16:05:04 +0200591 REDIRECT_INPUT = 0,
592 REDIRECT_OVERWRITE = 1,
593 REDIRECT_APPEND = 2,
594 REDIRECT_IO = 3,
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +0000595 REDIRECT_HEREDOC = 4,
Denys Vlasenko764b2f02009-06-07 16:05:04 +0200596 REDIRECT_HEREDOC2 = 5, /* REDIRECT_HEREDOC after heredoc is loaded */
Denis Vlasenkoc96865f2009-04-10 00:20:58 +0000597
598 REDIRFD_CLOSE = -3,
599 REDIRFD_SYNTAX_ERR = -2,
Denis Vlasenko835fcfd2009-04-10 13:51:56 +0000600 REDIRFD_TO_FILE = -1,
601 /* otherwise, rd_fd is redirected to rd_dup */
Denis Vlasenkoc96865f2009-04-10 00:20:58 +0000602
Denis Vlasenko02d6f1a2009-04-07 19:56:55 +0000603 HEREDOC_SKIPTABS = 1,
604 HEREDOC_QUOTED = 2,
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +0000605} redir_type;
606
Eric Andersen25f27032001-04-26 23:22:31 +0000607
Denis Vlasenko9af22c72008-10-09 12:54:58 +0000608struct command {
Denis Vlasenko0c886c62007-01-30 22:30:09 +0000609 pid_t pid; /* 0 if exited */
Denis Vlasenko2b576b82008-08-04 00:46:07 +0000610 int assignment_cnt; /* how many argv[i] are assignments? */
Denys Vlasenko9d617c42009-06-09 18:40:52 +0200611 smallint cmd_type; /* CMD_xxx */
612#define CMD_NORMAL 0
613#define CMD_SUBSHELL 1
Kang-Che Sung027d3ab2017-01-11 14:18:15 +0100614#if BASH_TEST2
Denys Vlasenkod383b492010-09-06 10:22:13 +0200615/* used for "[[ EXPR ]]" */
Denys Vlasenko9ca656b2009-06-10 13:39:35 +0200616# define CMD_SINGLEWORD_NOGLOB 2
Denis Vlasenkoed055212009-04-11 10:37:10 +0000617#endif
Denys Vlasenko9ca656b2009-06-10 13:39:35 +0200618#if ENABLE_HUSH_FUNCTIONS
619# define CMD_FUNCDEF 3
620#endif
621
Denys Vlasenko6696eac2010-11-14 02:01:50 +0100622 smalluint cmd_exitcode;
Denys Vlasenkocb6ff252009-05-04 00:14:30 +0200623 /* if non-NULL, this "command" is { list }, ( list ), or a compound statement */
624 struct pipe *group;
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +0000625#if !BB_MMU
626 char *group_as_string;
627#endif
Denis Vlasenkoed055212009-04-11 10:37:10 +0000628#if ENABLE_HUSH_FUNCTIONS
629 struct function *child_func;
630/* This field is used to prevent a bug here:
Denys Vlasenko9d617c42009-06-09 18:40:52 +0200631 * while...do f1() {a;}; f1; f1() {b;}; f1; done
Denis Vlasenkoed055212009-04-11 10:37:10 +0000632 * When we execute "f1() {a;}" cmd, we create new function and clear
633 * cmd->group, cmd->group_as_string, cmd->argv[0].
Denys Vlasenko9d617c42009-06-09 18:40:52 +0200634 * When we execute "f1() {b;}", we notice that f1 exists,
635 * and that its "parent cmd" struct is still "alive",
Denis Vlasenkoed055212009-04-11 10:37:10 +0000636 * we put those fields back into cmd->xxx
637 * (struct function has ->parent_cmd ptr to facilitate that).
638 * When we loop back, we can execute "f1() {a;}" again and set f1 correctly.
639 * Without this trick, loop would execute a;b;b;b;...
640 * instead of correct sequence a;b;a;b;...
641 * When command is freed, it severs the link
642 * (sets ->child_func->parent_cmd to NULL).
643 */
644#endif
Denis Vlasenko9af22c72008-10-09 12:54:58 +0000645 char **argv; /* command name and arguments */
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +0000646/* argv vector may contain variable references (^Cvar^C, ^C0^C etc)
647 * and on execution these are substituted with their values.
648 * Substitution can make _several_ words out of one argv[n]!
649 * Example: argv[0]=='.^C*^C.' here: echo .$*.
Denis Vlasenkoc7985b72008-06-17 05:43:38 +0000650 * References of the form ^C`cmd arg^C are `cmd arg` substitutions.
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +0000651 */
Denis Vlasenkoed055212009-04-11 10:37:10 +0000652 struct redir_struct *redirects; /* I/O redirections */
653};
Denis Vlasenkof8c1f022009-04-17 11:55:42 +0000654/* Is there anything in this command at all? */
655#define IS_NULL_CMD(cmd) \
656 (!(cmd)->group && !(cmd)->argv && !(cmd)->redirects)
657
Eric Andersen25f27032001-04-26 23:22:31 +0000658struct pipe {
Denis Vlasenkob81b3df2007-04-28 16:48:04 +0000659 struct pipe *next;
Denis Vlasenkob7d8c0d2009-04-10 19:05:43 +0000660 int num_cmds; /* total number of commands in pipe */
Denis Vlasenko9af22c72008-10-09 12:54:58 +0000661 int alive_cmds; /* number of commands running (not exited) */
662 int stopped_cmds; /* number of commands alive, but stopped */
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +0000663#if ENABLE_HUSH_JOB
Denys Vlasenkod5b5c2f2017-01-08 15:46:04 +0100664 unsigned jobid; /* job number */
Denis Vlasenko0c886c62007-01-30 22:30:09 +0000665 pid_t pgrp; /* process group ID for the job */
Denis Vlasenko219e88d2007-05-21 10:18:23 +0000666 char *cmdtext; /* name of job */
Denis Vlasenkob81b3df2007-04-28 16:48:04 +0000667#endif
Denis Vlasenko9af22c72008-10-09 12:54:58 +0000668 struct command *cmds; /* array of commands in pipe */
Denis Vlasenko219e88d2007-05-21 10:18:23 +0000669 smallint followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
Denis Vlasenko5ec61322008-06-24 00:50:07 +0000670 IF_HAS_KEYWORDS(smallint pi_inverted;) /* "! cmd | cmd" */
671 IF_HAS_KEYWORDS(smallint res_word;) /* needed for if, for, while, until... */
Eric Andersen25f27032001-04-26 23:22:31 +0000672};
Denis Vlasenkoa2b11e32009-04-06 14:11:13 +0000673typedef enum pipe_style {
Denys Vlasenko00a06b92016-11-08 20:35:53 +0100674 PIPE_SEQ = 0,
675 PIPE_AND = 1,
676 PIPE_OR = 2,
677 PIPE_BG = 3,
Denis Vlasenkoa2b11e32009-04-06 14:11:13 +0000678} pipe_style;
Denis Vlasenkof8c1f022009-04-17 11:55:42 +0000679/* Is there anything in this pipe at all? */
680#define IS_NULL_PIPE(pi) \
681 ((pi)->num_cmds == 0 IF_HAS_KEYWORDS( && (pi)->res_word == RES_NONE))
Eric Andersen25f27032001-04-26 23:22:31 +0000682
Denis Vlasenko9af22c72008-10-09 12:54:58 +0000683/* This holds pointers to the various results of parsing */
684struct parse_context {
Denis Vlasenkof9f74292009-04-03 00:07:05 +0000685 /* linked list of pipes */
Denis Vlasenko9af22c72008-10-09 12:54:58 +0000686 struct pipe *list_head;
Denis Vlasenkof9f74292009-04-03 00:07:05 +0000687 /* last pipe (being constructed right now) */
Denis Vlasenko9af22c72008-10-09 12:54:58 +0000688 struct pipe *pipe;
Denis Vlasenkof9f74292009-04-03 00:07:05 +0000689 /* last command in pipe (being constructed right now) */
690 struct command *command;
691 /* last redirect in command->redirects list */
Denis Vlasenko9af22c72008-10-09 12:54:58 +0000692 struct redir_struct *pending_redirect;
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +0000693#if !BB_MMU
694 o_string as_string;
695#endif
Denis Vlasenko9af22c72008-10-09 12:54:58 +0000696#if HAS_KEYWORDS
697 smallint ctx_res_w;
698 smallint ctx_inverted; /* "! cmd | cmd" */
699#if ENABLE_HUSH_CASE
700 smallint ctx_dsemicolon; /* ";;" seen */
701#endif
Denis Vlasenkof9f74292009-04-03 00:07:05 +0000702 /* bitmask of FLAG_xxx, for figuring out valid reserved words */
703 int old_flag;
704 /* group we are enclosed in:
Denis Vlasenko34d4d892009-04-04 20:24:37 +0000705 * example: "if pipe1; pipe2; then pipe3; fi"
706 * when we see "if" or "then", we malloc and copy current context,
707 * and make ->stack point to it. then we parse pipeN.
708 * when closing "then" / fi" / whatever is found,
709 * we move list_head into ->stack->command->group,
710 * copy ->stack into current context, and delete ->stack.
711 * (parsing of { list } and ( list ) doesn't use this method)
Denis Vlasenkof9f74292009-04-03 00:07:05 +0000712 */
Denis Vlasenko9af22c72008-10-09 12:54:58 +0000713 struct parse_context *stack;
714#endif
715};
716
Denis Vlasenkod76c0492007-05-25 02:16:25 +0000717/* On program start, environ points to initial environment.
718 * putenv adds new pointers into it, unsetenv removes them.
719 * Neither of these (de)allocates the strings.
720 * setenv allocates new strings in malloc space and does putenv,
721 * and thus setenv is unusable (leaky) for shell's purposes */
722#define setenv(...) setenv_is_leaky_dont_use()
723struct variable {
724 struct variable *next;
Denis Vlasenko28c0f0f2007-05-25 02:46:01 +0000725 char *varstr; /* points to "name=" portion */
Denys Vlasenko295fef82009-06-03 12:47:26 +0200726#if ENABLE_HUSH_LOCAL
727 unsigned func_nest_level;
728#endif
Denis Vlasenkod76c0492007-05-25 02:16:25 +0000729 int max_len; /* if > 0, name is part of initial env; else name is malloced */
730 smallint flg_export; /* putenv should be done on this var */
Denis Vlasenko219e88d2007-05-21 10:18:23 +0000731 smallint flg_read_only;
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000732};
733
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000734enum {
Denis Vlasenkobcb25532008-07-28 23:04:34 +0000735 BC_BREAK = 1,
736 BC_CONTINUE = 2,
737};
738
Denis Vlasenkoc0ea3292009-04-10 21:22:02 +0000739#if ENABLE_HUSH_FUNCTIONS
Denis Vlasenkob7d8c0d2009-04-10 19:05:43 +0000740struct function {
741 struct function *next;
742 char *name;
Denis Vlasenkoed055212009-04-11 10:37:10 +0000743 struct command *parent_cmd;
Denis Vlasenkob7d8c0d2009-04-10 19:05:43 +0000744 struct pipe *body;
Denys Vlasenkoc1947f12009-10-23 01:30:26 +0200745# if !BB_MMU
Denis Vlasenkoc0ea3292009-04-10 21:22:02 +0000746 char *body_as_string;
Denys Vlasenkoc1947f12009-10-23 01:30:26 +0200747# endif
Denis Vlasenkob7d8c0d2009-04-10 19:05:43 +0000748};
Denis Vlasenkoc0ea3292009-04-10 21:22:02 +0000749#endif
Denis Vlasenkob7d8c0d2009-04-10 19:05:43 +0000750
Denis Vlasenkod76c0492007-05-25 02:16:25 +0000751
Denys Vlasenko6696eac2010-11-14 02:01:50 +0100752/* set -/+o OPT support. (TODO: make it optional)
753 * bash supports the following opts:
754 * allexport off
755 * braceexpand on
756 * emacs on
757 * errexit off
758 * errtrace off
759 * functrace off
760 * hashall on
761 * histexpand off
762 * history on
763 * ignoreeof off
764 * interactive-comments on
765 * keyword off
766 * monitor on
767 * noclobber off
768 * noexec off
769 * noglob off
770 * nolog off
771 * notify off
772 * nounset off
773 * onecmd off
774 * physical off
775 * pipefail off
776 * posix off
777 * privileged off
778 * verbose off
779 * vi off
780 * xtrace off
781 */
Dan Fandrich85c62472010-11-20 13:05:17 -0800782static const char o_opt_strings[] ALIGN1 =
783 "pipefail\0"
784 "noexec\0"
Denys Vlasenko9fda6092017-07-14 13:36:48 +0200785 "errexit\0"
Dan Fandrich85c62472010-11-20 13:05:17 -0800786#if ENABLE_HUSH_MODE_X
787 "xtrace\0"
788#endif
789 ;
Denys Vlasenko6696eac2010-11-14 02:01:50 +0100790enum {
791 OPT_O_PIPEFAIL,
Dan Fandrich85c62472010-11-20 13:05:17 -0800792 OPT_O_NOEXEC,
Denys Vlasenko9fda6092017-07-14 13:36:48 +0200793 OPT_O_ERREXIT,
Dan Fandrich85c62472010-11-20 13:05:17 -0800794#if ENABLE_HUSH_MODE_X
795 OPT_O_XTRACE,
796#endif
Denys Vlasenko6696eac2010-11-14 02:01:50 +0100797 NUM_OPT_O
798};
799
800
Denys Vlasenko7b25b1c2016-08-20 15:58:34 +0200801struct FILE_list {
802 struct FILE_list *next;
803 FILE *fp;
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +0200804 int fd;
Denys Vlasenko7b25b1c2016-08-20 15:58:34 +0200805};
806
807
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000808/* "Globals" within this file */
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000809/* Sorted roughly by size (smaller offsets == smaller code) */
810struct globals {
Denis Vlasenkoc8653f62009-04-27 23:29:14 +0000811 /* interactive_fd != 0 means we are an interactive shell.
812 * If we are, then saved_tty_pgrp can also be != 0, meaning
813 * that controlling tty is available. With saved_tty_pgrp == 0,
814 * job control still works, but terminal signals
815 * (^C, ^Z, ^Y, ^\) won't work at all, and background
816 * process groups can only be created with "cmd &".
817 * With saved_tty_pgrp != 0, hush will use tcsetpgrp()
818 * to give tty to the foreground process group,
819 * and will take it back when the group is stopped (^Z)
820 * or killed (^C).
821 */
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000822#if ENABLE_HUSH_INTERACTIVE
823 /* 'interactive_fd' is a fd# open to ctty, if we have one
824 * _AND_ if we decided to act interactively */
825 int interactive_fd;
826 const char *PS1;
827 const char *PS2;
Denis Vlasenkoc8653f62009-04-27 23:29:14 +0000828# define G_interactive_fd (G.interactive_fd)
Denis Vlasenko60b392f2009-04-03 19:14:32 +0000829#else
Denis Vlasenkoc8653f62009-04-27 23:29:14 +0000830# define G_interactive_fd 0
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000831#endif
832#if ENABLE_FEATURE_EDITING
833 line_input_t *line_input_state;
834#endif
Denis Vlasenkocc3f20b2008-06-23 22:31:52 +0000835 pid_t root_pid;
Denys Vlasenkodea47882009-10-09 15:40:49 +0200836 pid_t root_ppid;
Denis Vlasenko87a86552008-07-29 19:43:10 +0000837 pid_t last_bg_pid;
Denys Vlasenko20b3d142009-10-09 20:59:39 +0200838#if ENABLE_HUSH_RANDOM_SUPPORT
839 random_t random_gen;
840#endif
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000841#if ENABLE_HUSH_JOB
842 int run_list_level;
Denys Vlasenkod5b5c2f2017-01-08 15:46:04 +0100843 unsigned last_jobid;
Denis Vlasenkoc8653f62009-04-27 23:29:14 +0000844 pid_t saved_tty_pgrp;
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000845 struct pipe *job_list;
Mike Frysinger38478a62009-05-20 04:48:06 -0400846# define G_saved_tty_pgrp (G.saved_tty_pgrp)
847#else
848# define G_saved_tty_pgrp 0
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000849#endif
Denys Vlasenko9fda6092017-07-14 13:36:48 +0200850 /* How deeply are we in context where "set -e" is ignored */
851 int errexit_depth;
852 /* "set -e" rules (do we follow them correctly?):
853 * Exit if pipe, list, or compound command exits with a non-zero status.
854 * Shell does not exit if failed command is part of condition in
855 * if/while, part of && or || list except the last command, any command
856 * in a pipe but the last, or if the command's return value is being
857 * inverted with !. If a compound command other than a subshell returns a
858 * non-zero status because a command failed while -e was being ignored, the
859 * shell does not exit. A trap on ERR, if set, is executed before the shell
860 * exits [ERR is a bashism].
861 *
862 * If a compound command or function executes in a context where -e is
863 * ignored, none of the commands executed within are affected by the -e
864 * setting. If a compound command or function sets -e while executing in a
865 * context where -e is ignored, that setting does not have any effect until
866 * the compound command or the command containing the function call completes.
867 */
868
Denys Vlasenko26777aa2010-11-22 23:49:10 +0100869 char o_opt[NUM_OPT_O];
Denys Vlasenko57542eb2010-11-28 03:59:30 +0100870#if ENABLE_HUSH_MODE_X
871# define G_x_mode (G.o_opt[OPT_O_XTRACE])
872#else
873# define G_x_mode 0
874#endif
Denis Vlasenko422cd7c2009-03-31 12:41:52 +0000875 smallint flag_SIGINT;
Denis Vlasenkodadfb492008-07-29 10:16:05 +0000876#if ENABLE_HUSH_LOOPS
Denis Vlasenkobcb25532008-07-28 23:04:34 +0000877 smallint flag_break_continue;
Denis Vlasenkodadfb492008-07-29 10:16:05 +0000878#endif
Denis Vlasenko3d40d8e2009-04-17 23:44:18 +0000879#if ENABLE_HUSH_FUNCTIONS
880 /* 0: outside of a function (or sourced file)
881 * -1: inside of a function, ok to use return builtin
Denis Vlasenkoc8653f62009-04-27 23:29:14 +0000882 * 1: return is invoked, skip all till end of func
Denis Vlasenko3d40d8e2009-04-17 23:44:18 +0000883 */
884 smallint flag_return_in_progress;
Denys Vlasenko04b46bc2016-10-01 22:28:03 +0200885# define G_flag_return_in_progress (G.flag_return_in_progress)
886#else
887# define G_flag_return_in_progress 0
Denis Vlasenko3d40d8e2009-04-17 23:44:18 +0000888#endif
Denis Vlasenkoefea9d22009-04-09 13:43:11 +0000889 smallint exiting; /* used to prevent EXIT trap recursion */
Denis Vlasenkod5762932009-03-31 11:22:57 +0000890 /* These four support $?, $#, and $1 */
Denis Vlasenkoab2b0642009-04-06 18:42:11 +0000891 smalluint last_exitcode;
Denys Vlasenko840a4352017-07-07 22:56:02 +0200892 smalluint last_bg_pid_exitcode;
Denys Vlasenko4e4f88e2017-01-09 07:57:38 +0100893#if ENABLE_HUSH_SET
Denis Vlasenkocc4c6932009-04-05 07:38:48 +0000894 /* are global_argv and global_argv[1..n] malloced? (note: not [0]) */
Denis Vlasenko11fb7cf2009-03-20 10:13:08 +0000895 smalluint global_args_malloced;
Denys Vlasenko4e4f88e2017-01-09 07:57:38 +0100896# define G_global_args_malloced (G.global_args_malloced)
897#else
898# define G_global_args_malloced 0
899#endif
Denis Vlasenkoe1300f62009-03-22 11:41:18 +0000900 /* how many non-NULL argv's we have. NB: $# + 1 */
901 int global_argc;
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000902 char **global_argv;
Denis Vlasenkocc4c6932009-04-05 07:38:48 +0000903#if !BB_MMU
Denis Vlasenko46f9b6d2009-04-05 10:39:03 +0000904 char *argv0_for_re_execing;
Denis Vlasenkocc4c6932009-04-05 07:38:48 +0000905#endif
Denis Vlasenkodadfb492008-07-29 10:16:05 +0000906#if ENABLE_HUSH_LOOPS
Denis Vlasenko6a2d40f2008-07-28 23:07:06 +0000907 unsigned depth_break_continue;
Denis Vlasenkofcf37c32008-07-29 11:37:15 +0000908 unsigned depth_of_loop;
Denis Vlasenkodadfb492008-07-29 10:16:05 +0000909#endif
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000910 const char *ifs;
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000911 const char *cwd;
Denys Vlasenko52e460b2010-09-16 16:12:00 +0200912 struct variable *top_var;
Denys Vlasenko29082232010-07-16 13:52:32 +0200913 char **expanded_assignments;
Denis Vlasenkoc0ea3292009-04-10 21:22:02 +0000914#if ENABLE_HUSH_FUNCTIONS
Denis Vlasenkob7d8c0d2009-04-10 19:05:43 +0000915 struct function *top_func;
Denys Vlasenko295fef82009-06-03 12:47:26 +0200916# if ENABLE_HUSH_LOCAL
917 struct variable **shadowed_vars_pp;
918 unsigned func_nest_level;
919# endif
Denis Vlasenkoc0ea3292009-04-10 21:22:02 +0000920#endif
Denis Vlasenkod5762932009-03-31 11:22:57 +0000921 /* Signal and trap handling */
Denys Vlasenko8d7be232009-05-25 16:38:32 +0200922#if ENABLE_HUSH_FAST
923 unsigned count_SIGCHLD;
924 unsigned handled_SIGCHLD;
Denys Vlasenkoe2df5f42009-05-26 14:34:10 +0200925 smallint we_have_children;
Denys Vlasenko8d7be232009-05-25 16:38:32 +0200926#endif
Denys Vlasenko7b25b1c2016-08-20 15:58:34 +0200927 struct FILE_list *FILE_list;
Denys Vlasenko10c01312011-05-11 11:49:21 +0200928 /* Which signals have non-DFL handler (even with no traps set)?
929 * Set at the start to:
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +0200930 * (SIGQUIT + maybe SPECIAL_INTERACTIVE_SIGS + maybe SPECIAL_JOBSTOP_SIGS)
Denys Vlasenko10c01312011-05-11 11:49:21 +0200931 * SPECIAL_INTERACTIVE_SIGS are cleared after fork.
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +0200932 * The rest is cleared right before execv syscalls.
Denys Vlasenko10c01312011-05-11 11:49:21 +0200933 * Other than these two times, never modified.
934 */
935 unsigned special_sig_mask;
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +0200936#if ENABLE_HUSH_JOB
937 unsigned fatal_sig_mask;
Denys Vlasenko4e4f88e2017-01-09 07:57:38 +0100938# define G_fatal_sig_mask (G.fatal_sig_mask)
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +0200939#else
Denys Vlasenko75e77de2011-05-12 13:12:47 +0200940# define G_fatal_sig_mask 0
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +0200941#endif
Denys Vlasenko7a85c602017-01-08 17:40:18 +0100942#if ENABLE_HUSH_TRAP
Denis Vlasenko7566bae2009-03-31 17:24:49 +0000943 char **traps; /* char *traps[NSIG] */
Denys Vlasenko7a85c602017-01-08 17:40:18 +0100944# define G_traps G.traps
945#else
946# define G_traps ((char**)NULL)
947#endif
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +0200948 sigset_t pending_set;
Denys Vlasenko44719692017-01-08 18:44:41 +0100949#if ENABLE_HUSH_MEMLEAK
Denis Vlasenkoc73b70c2009-04-08 11:48:57 +0000950 unsigned long memleak_value;
Denys Vlasenko44719692017-01-08 18:44:41 +0100951#endif
952#if HUSH_DEBUG
Denis Vlasenko0701dca2009-04-11 10:38:47 +0000953 int debug_indent;
Denis Vlasenkoc73b70c2009-04-08 11:48:57 +0000954#endif
Denys Vlasenko0806e402011-05-12 23:06:20 +0200955 struct sigaction sa;
Denys Vlasenko0448c552016-09-29 20:25:44 +0200956#if ENABLE_FEATURE_EDITING
957 char user_input_buf[CONFIG_FEATURE_EDITING_MAX_LEN];
958#endif
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000959};
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000960#define G (*ptr_to_globals)
Denis Vlasenko87a86552008-07-29 19:43:10 +0000961/* Not #defining name to G.name - this quickly gets unwieldy
962 * (too many defines). Also, I actually prefer to see when a variable
963 * is global, thus "G." prefix is a useful hint */
Denis Vlasenko574f2f42008-02-27 18:41:59 +0000964#define INIT_G() do { \
965 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
Denys Vlasenko0806e402011-05-12 23:06:20 +0200966 /* memset(&G.sa, 0, sizeof(G.sa)); */ \
967 sigfillset(&G.sa.sa_mask); \
968 G.sa.sa_flags = SA_RESTART; \
Denis Vlasenko574f2f42008-02-27 18:41:59 +0000969} while (0)
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000970
971
Denis Vlasenko424f79b2009-03-22 14:23:34 +0000972/* Function prototypes for builtins */
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +0200973static int builtin_cd(char **argv) FAST_FUNC;
Denys Vlasenko1cc68042017-01-09 17:10:04 +0100974#if ENABLE_HUSH_ECHO
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +0200975static int builtin_echo(char **argv) FAST_FUNC;
Denys Vlasenko1cc68042017-01-09 17:10:04 +0100976#endif
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +0200977static int builtin_eval(char **argv) FAST_FUNC;
978static int builtin_exec(char **argv) FAST_FUNC;
979static int builtin_exit(char **argv) FAST_FUNC;
Denys Vlasenko6ec76d82017-01-08 18:40:41 +0100980#if ENABLE_HUSH_EXPORT
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +0200981static int builtin_export(char **argv) FAST_FUNC;
Denys Vlasenko6ec76d82017-01-08 18:40:41 +0100982#endif
Denys Vlasenko1e660422017-07-17 21:10:50 +0200983#if ENABLE_HUSH_READONLY
984static int builtin_readonly(char **argv) FAST_FUNC;
985#endif
Denis Vlasenko424f79b2009-03-22 14:23:34 +0000986#if ENABLE_HUSH_JOB
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +0200987static int builtin_fg_bg(char **argv) FAST_FUNC;
988static int builtin_jobs(char **argv) FAST_FUNC;
Denis Vlasenko424f79b2009-03-22 14:23:34 +0000989#endif
Denys Vlasenko74d40582017-08-11 01:32:46 +0200990#if ENABLE_HUSH_GETOPTS
991static int builtin_getopts(char **argv) FAST_FUNC;
992#endif
Denis Vlasenko424f79b2009-03-22 14:23:34 +0000993#if ENABLE_HUSH_HELP
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +0200994static int builtin_help(char **argv) FAST_FUNC;
Denis Vlasenko424f79b2009-03-22 14:23:34 +0000995#endif
Denys Vlasenkoff463a82013-05-12 02:45:23 +0200996#if MAX_HISTORY && ENABLE_FEATURE_EDITING
Flemming Madsend96ffda2013-04-07 18:47:24 +0200997static int builtin_history(char **argv) FAST_FUNC;
998#endif
Denys Vlasenko295fef82009-06-03 12:47:26 +0200999#if ENABLE_HUSH_LOCAL
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001000static int builtin_local(char **argv) FAST_FUNC;
Denys Vlasenko295fef82009-06-03 12:47:26 +02001001#endif
Denys Vlasenko44719692017-01-08 18:44:41 +01001002#if ENABLE_HUSH_MEMLEAK
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001003static int builtin_memleak(char **argv) FAST_FUNC;
Denis Vlasenkoc73b70c2009-04-08 11:48:57 +00001004#endif
Denys Vlasenko1125d7d2017-01-08 17:19:38 +01001005#if ENABLE_HUSH_PRINTF
Mike Frysinger4ebc76c2009-10-15 03:32:39 -04001006static int builtin_printf(char **argv) FAST_FUNC;
1007#endif
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001008static int builtin_pwd(char **argv) FAST_FUNC;
Denys Vlasenko7a85c602017-01-08 17:40:18 +01001009#if ENABLE_HUSH_READ
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001010static int builtin_read(char **argv) FAST_FUNC;
Denys Vlasenko7a85c602017-01-08 17:40:18 +01001011#endif
Denys Vlasenko10d5ece2017-01-08 18:28:43 +01001012#if ENABLE_HUSH_SET
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001013static int builtin_set(char **argv) FAST_FUNC;
Denys Vlasenko10d5ece2017-01-08 18:28:43 +01001014#endif
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001015static int builtin_shift(char **argv) FAST_FUNC;
1016static int builtin_source(char **argv) FAST_FUNC;
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01001017#if ENABLE_HUSH_TEST || BASH_TEST2
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001018static int builtin_test(char **argv) FAST_FUNC;
Denys Vlasenko265062d2017-01-10 15:13:30 +01001019#endif
Denys Vlasenko7a85c602017-01-08 17:40:18 +01001020#if ENABLE_HUSH_TRAP
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001021static int builtin_trap(char **argv) FAST_FUNC;
Denys Vlasenko7a85c602017-01-08 17:40:18 +01001022#endif
Denys Vlasenko1125d7d2017-01-08 17:19:38 +01001023#if ENABLE_HUSH_TYPE
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001024static int builtin_type(char **argv) FAST_FUNC;
Denys Vlasenko1125d7d2017-01-08 17:19:38 +01001025#endif
Denys Vlasenko11f2e992017-08-10 16:34:03 +02001026#if ENABLE_HUSH_TIMES
1027static int builtin_times(char **argv) FAST_FUNC;
1028#endif
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001029static int builtin_true(char **argv) FAST_FUNC;
Denys Vlasenkod5933b12017-01-08 18:31:39 +01001030#if ENABLE_HUSH_UMASK
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001031static int builtin_umask(char **argv) FAST_FUNC;
Denys Vlasenkod5933b12017-01-08 18:31:39 +01001032#endif
Denys Vlasenko10d5ece2017-01-08 18:28:43 +01001033#if ENABLE_HUSH_UNSET
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001034static int builtin_unset(char **argv) FAST_FUNC;
Denys Vlasenko10d5ece2017-01-08 18:28:43 +01001035#endif
Denys Vlasenko1125d7d2017-01-08 17:19:38 +01001036#if ENABLE_HUSH_KILL
1037static int builtin_kill(char **argv) FAST_FUNC;
1038#endif
1039#if ENABLE_HUSH_WAIT
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001040static int builtin_wait(char **argv) FAST_FUNC;
Denys Vlasenko1125d7d2017-01-08 17:19:38 +01001041#endif
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001042#if ENABLE_HUSH_LOOPS
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001043static int builtin_break(char **argv) FAST_FUNC;
1044static int builtin_continue(char **argv) FAST_FUNC;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001045#endif
Denis Vlasenko3d40d8e2009-04-17 23:44:18 +00001046#if ENABLE_HUSH_FUNCTIONS
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001047static int builtin_return(char **argv) FAST_FUNC;
Denis Vlasenko3d40d8e2009-04-17 23:44:18 +00001048#endif
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001049
1050/* Table of built-in functions. They can be forked or not, depending on
1051 * context: within pipes, they fork. As simple commands, they do not.
1052 * When used in non-forking context, they can change global variables
1053 * in the parent shell process. If forked, of course they cannot.
1054 * For example, 'unset foo | whatever' will parse and run, but foo will
1055 * still be set at the end. */
1056struct built_in_command {
Denys Vlasenko17323a62010-01-28 01:57:05 +01001057 const char *b_cmd;
1058 int (*b_function)(char **argv) FAST_FUNC;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001059#if ENABLE_HUSH_HELP
Denys Vlasenko17323a62010-01-28 01:57:05 +01001060 const char *b_descr;
Denys Vlasenko28a105d2009-06-01 11:26:30 +02001061# define BLTIN(cmd, func, help) { cmd, func, help }
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001062#else
Denys Vlasenko28a105d2009-06-01 11:26:30 +02001063# define BLTIN(cmd, func, help) { cmd, func }
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001064#endif
1065};
1066
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001067static const struct built_in_command bltins1[] = {
Denys Vlasenko80f806c2017-01-10 16:51:10 +01001068 BLTIN("." , builtin_source , "Run commands in file"),
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001069 BLTIN(":" , builtin_true , NULL),
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001070#if ENABLE_HUSH_JOB
Denys Vlasenko80f806c2017-01-10 16:51:10 +01001071 BLTIN("bg" , builtin_fg_bg , "Resume job in background"),
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001072#endif
1073#if ENABLE_HUSH_LOOPS
Denys Vlasenko80f806c2017-01-10 16:51:10 +01001074 BLTIN("break" , builtin_break , "Exit loop"),
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001075#endif
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001076 BLTIN("cd" , builtin_cd , "Change directory"),
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001077#if ENABLE_HUSH_LOOPS
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001078 BLTIN("continue" , builtin_continue, "Start new loop iteration"),
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001079#endif
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001080 BLTIN("eval" , builtin_eval , "Construct and run shell command"),
1081 BLTIN("exec" , builtin_exec , "Execute command, don't return to shell"),
Denys Vlasenko80f806c2017-01-10 16:51:10 +01001082 BLTIN("exit" , builtin_exit , NULL),
Denys Vlasenko6ec76d82017-01-08 18:40:41 +01001083#if ENABLE_HUSH_EXPORT
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001084 BLTIN("export" , builtin_export , "Set environment variables"),
Denys Vlasenko6ec76d82017-01-08 18:40:41 +01001085#endif
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001086#if ENABLE_HUSH_JOB
Denys Vlasenkod2c15bc2017-07-18 18:14:42 +02001087 BLTIN("fg" , builtin_fg_bg , "Bring job to foreground"),
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001088#endif
Denys Vlasenko74d40582017-08-11 01:32:46 +02001089#if ENABLE_HUSH_GETOPTS
1090 BLTIN("getopts" , builtin_getopts , NULL),
1091#endif
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001092#if ENABLE_HUSH_HELP
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001093 BLTIN("help" , builtin_help , NULL),
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001094#endif
Denys Vlasenkoff463a82013-05-12 02:45:23 +02001095#if MAX_HISTORY && ENABLE_FEATURE_EDITING
Denys Vlasenko80f806c2017-01-10 16:51:10 +01001096 BLTIN("history" , builtin_history , "Show history"),
Flemming Madsend96ffda2013-04-07 18:47:24 +02001097#endif
Denis Vlasenko34d4d892009-04-04 20:24:37 +00001098#if ENABLE_HUSH_JOB
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001099 BLTIN("jobs" , builtin_jobs , "List jobs"),
Denis Vlasenko34d4d892009-04-04 20:24:37 +00001100#endif
Denys Vlasenko1125d7d2017-01-08 17:19:38 +01001101#if ENABLE_HUSH_KILL
1102 BLTIN("kill" , builtin_kill , "Send signals to processes"),
1103#endif
Denys Vlasenko295fef82009-06-03 12:47:26 +02001104#if ENABLE_HUSH_LOCAL
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001105 BLTIN("local" , builtin_local , "Set local variables"),
Denys Vlasenko295fef82009-06-03 12:47:26 +02001106#endif
Denys Vlasenko44719692017-01-08 18:44:41 +01001107#if ENABLE_HUSH_MEMLEAK
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001108 BLTIN("memleak" , builtin_memleak , NULL),
Denis Vlasenkoc73b70c2009-04-08 11:48:57 +00001109#endif
Denys Vlasenko7a85c602017-01-08 17:40:18 +01001110#if ENABLE_HUSH_READ
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001111 BLTIN("read" , builtin_read , "Input into variable"),
Denys Vlasenko7a85c602017-01-08 17:40:18 +01001112#endif
Denys Vlasenko1e660422017-07-17 21:10:50 +02001113#if ENABLE_HUSH_READONLY
1114 BLTIN("readonly" , builtin_readonly, "Make variables read-only"),
1115#endif
Denis Vlasenko3d40d8e2009-04-17 23:44:18 +00001116#if ENABLE_HUSH_FUNCTIONS
Denys Vlasenko80f806c2017-01-10 16:51:10 +01001117 BLTIN("return" , builtin_return , "Return from function"),
Denis Vlasenko3d40d8e2009-04-17 23:44:18 +00001118#endif
Denys Vlasenko10d5ece2017-01-08 18:28:43 +01001119#if ENABLE_HUSH_SET
Denys Vlasenko80f806c2017-01-10 16:51:10 +01001120 BLTIN("set" , builtin_set , "Set positional parameters"),
Denys Vlasenko10d5ece2017-01-08 18:28:43 +01001121#endif
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001122 BLTIN("shift" , builtin_shift , "Shift positional parameters"),
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01001123#if BASH_SOURCE
Denys Vlasenko80f806c2017-01-10 16:51:10 +01001124 BLTIN("source" , builtin_source , NULL),
Denys Vlasenko82731b42010-05-17 17:49:52 +02001125#endif
Denys Vlasenko11f2e992017-08-10 16:34:03 +02001126#if ENABLE_HUSH_TIMES
1127 BLTIN("times" , builtin_times , NULL),
1128#endif
Denys Vlasenko7a85c602017-01-08 17:40:18 +01001129#if ENABLE_HUSH_TRAP
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001130 BLTIN("trap" , builtin_trap , "Trap signals"),
Denys Vlasenko7a85c602017-01-08 17:40:18 +01001131#endif
Denys Vlasenko2bba5912014-03-14 12:43:57 +01001132 BLTIN("true" , builtin_true , NULL),
Denys Vlasenko1125d7d2017-01-08 17:19:38 +01001133#if ENABLE_HUSH_TYPE
Denys Vlasenko651a2692010-03-23 16:25:17 +01001134 BLTIN("type" , builtin_type , "Show command type"),
Denys Vlasenko1125d7d2017-01-08 17:19:38 +01001135#endif
Denys Vlasenko7a85c602017-01-08 17:40:18 +01001136#if ENABLE_HUSH_ULIMIT
Denys Vlasenko10d5ece2017-01-08 18:28:43 +01001137 BLTIN("ulimit" , shell_builtin_ulimit, "Control resource limits"),
Denys Vlasenko7a85c602017-01-08 17:40:18 +01001138#endif
Denys Vlasenkod5933b12017-01-08 18:31:39 +01001139#if ENABLE_HUSH_UMASK
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001140 BLTIN("umask" , builtin_umask , "Set file creation mask"),
Denys Vlasenkod5933b12017-01-08 18:31:39 +01001141#endif
Denys Vlasenko10d5ece2017-01-08 18:28:43 +01001142#if ENABLE_HUSH_UNSET
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001143 BLTIN("unset" , builtin_unset , "Unset variables"),
Denys Vlasenko10d5ece2017-01-08 18:28:43 +01001144#endif
Denys Vlasenko1125d7d2017-01-08 17:19:38 +01001145#if ENABLE_HUSH_WAIT
Denys Vlasenkod2c15bc2017-07-18 18:14:42 +02001146 BLTIN("wait" , builtin_wait , "Wait for process to finish"),
Denys Vlasenko1125d7d2017-01-08 17:19:38 +01001147#endif
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001148};
Denys Vlasenko80f806c2017-01-10 16:51:10 +01001149/* These builtins won't be used if we are on NOMMU and need to re-exec
1150 * (it's cheaper to run an external program in this case):
1151 */
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001152static const struct built_in_command bltins2[] = {
Denys Vlasenko265062d2017-01-10 15:13:30 +01001153#if ENABLE_HUSH_TEST
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001154 BLTIN("[" , builtin_test , NULL),
Denys Vlasenko265062d2017-01-10 15:13:30 +01001155#endif
Denys Vlasenko8944c672017-01-11 14:22:00 +01001156#if BASH_TEST2
1157 BLTIN("[[" , builtin_test , NULL),
1158#endif
Denys Vlasenko1cc68042017-01-09 17:10:04 +01001159#if ENABLE_HUSH_ECHO
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001160 BLTIN("echo" , builtin_echo , NULL),
Denys Vlasenko1cc68042017-01-09 17:10:04 +01001161#endif
Denys Vlasenko1125d7d2017-01-08 17:19:38 +01001162#if ENABLE_HUSH_PRINTF
Mike Frysinger4ebc76c2009-10-15 03:32:39 -04001163 BLTIN("printf" , builtin_printf , NULL),
1164#endif
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001165 BLTIN("pwd" , builtin_pwd , NULL),
Denys Vlasenko265062d2017-01-10 15:13:30 +01001166#if ENABLE_HUSH_TEST
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02001167 BLTIN("test" , builtin_test , NULL),
Denys Vlasenko265062d2017-01-10 15:13:30 +01001168#endif
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001169};
1170
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +00001171
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001172/* Debug printouts.
1173 */
1174#if HUSH_DEBUG
1175/* prevent disasters with G.debug_indent < 0 */
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01001176# define indent() fdprintf(2, "%*s", (G.debug_indent * 2) & 0xff, "")
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001177# define debug_enter() (G.debug_indent++)
1178# define debug_leave() (G.debug_indent--)
1179#else
Denys Vlasenko28a105d2009-06-01 11:26:30 +02001180# define indent() ((void)0)
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001181# define debug_enter() ((void)0)
1182# define debug_leave() ((void)0)
1183#endif
1184
1185#ifndef debug_printf
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01001186# define debug_printf(...) (indent(), fdprintf(2, __VA_ARGS__))
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001187#endif
1188
1189#ifndef debug_printf_parse
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01001190# define debug_printf_parse(...) (indent(), fdprintf(2, __VA_ARGS__))
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001191#endif
1192
1193#ifndef debug_printf_exec
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01001194#define debug_printf_exec(...) (indent(), fdprintf(2, __VA_ARGS__))
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001195#endif
1196
1197#ifndef debug_printf_env
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01001198# define debug_printf_env(...) (indent(), fdprintf(2, __VA_ARGS__))
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001199#endif
1200
1201#ifndef debug_printf_jobs
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01001202# define debug_printf_jobs(...) (indent(), fdprintf(2, __VA_ARGS__))
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001203# define DEBUG_JOBS 1
1204#else
1205# define DEBUG_JOBS 0
1206#endif
1207
1208#ifndef debug_printf_expand
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01001209# define debug_printf_expand(...) (indent(), fdprintf(2, __VA_ARGS__))
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001210# define DEBUG_EXPAND 1
1211#else
1212# define DEBUG_EXPAND 0
1213#endif
1214
Denys Vlasenko1e811b12010-05-22 03:12:29 +02001215#ifndef debug_printf_varexp
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01001216# define debug_printf_varexp(...) (indent(), fdprintf(2, __VA_ARGS__))
Denys Vlasenko1e811b12010-05-22 03:12:29 +02001217#endif
1218
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001219#ifndef debug_printf_glob
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01001220# define debug_printf_glob(...) (indent(), fdprintf(2, __VA_ARGS__))
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001221# define DEBUG_GLOB 1
1222#else
1223# define DEBUG_GLOB 0
1224#endif
1225
Denys Vlasenko2db74612017-07-07 22:07:28 +02001226#ifndef debug_printf_redir
1227# define debug_printf_redir(...) (indent(), fdprintf(2, __VA_ARGS__))
1228#endif
1229
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001230#ifndef debug_printf_list
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01001231# define debug_printf_list(...) (indent(), fdprintf(2, __VA_ARGS__))
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001232#endif
1233
1234#ifndef debug_printf_subst
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01001235# define debug_printf_subst(...) (indent(), fdprintf(2, __VA_ARGS__))
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001236#endif
1237
1238#ifndef debug_printf_clean
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01001239# define debug_printf_clean(...) (indent(), fdprintf(2, __VA_ARGS__))
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001240# define DEBUG_CLEAN 1
1241#else
1242# define DEBUG_CLEAN 0
1243#endif
1244
1245#if DEBUG_EXPAND
1246static void debug_print_strings(const char *prefix, char **vv)
1247{
1248 indent();
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01001249 fdprintf(2, "%s:\n", prefix);
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001250 while (*vv)
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01001251 fdprintf(2, " '%s'\n", *vv++);
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001252}
1253#else
Denys Vlasenko28a105d2009-06-01 11:26:30 +02001254# define debug_print_strings(prefix, vv) ((void)0)
Denis Vlasenko0701dca2009-04-11 10:38:47 +00001255#endif
1256
1257
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001258/* Leak hunting. Use hush_leaktool.sh for post-processing.
1259 */
1260#if LEAK_HUNTING
1261static void *xxmalloc(int lineno, size_t size)
Denis Vlasenko90e485c2007-05-23 15:22:50 +00001262{
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001263 void *ptr = xmalloc((size + 0xff) & ~0xff);
1264 fdprintf(2, "line %d: malloc %p\n", lineno, ptr);
1265 return ptr;
1266}
1267static void *xxrealloc(int lineno, void *ptr, size_t size)
1268{
1269 ptr = xrealloc(ptr, (size + 0xff) & ~0xff);
1270 fdprintf(2, "line %d: realloc %p\n", lineno, ptr);
1271 return ptr;
1272}
1273static char *xxstrdup(int lineno, const char *str)
1274{
1275 char *ptr = xstrdup(str);
1276 fdprintf(2, "line %d: strdup %p\n", lineno, ptr);
1277 return ptr;
1278}
1279static void xxfree(void *ptr)
1280{
1281 fdprintf(2, "free %p\n", ptr);
1282 free(ptr);
1283}
Denys Vlasenko8391c482010-05-22 17:50:43 +02001284# define xmalloc(s) xxmalloc(__LINE__, s)
1285# define xrealloc(p, s) xxrealloc(__LINE__, p, s)
1286# define xstrdup(s) xxstrdup(__LINE__, s)
1287# define free(p) xxfree(p)
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001288#endif
1289
1290
1291/* Syntax and runtime errors. They always abort scripts.
1292 * In interactive use they usually discard unparsed and/or unexecuted commands
1293 * and return to the prompt.
1294 * HUSH_DEBUG >= 2 prints line number in this file where it was detected.
1295 */
1296#if HUSH_DEBUG < 2
Denys Vlasenko39701202017-08-02 19:44:05 +02001297# define msg_and_die_if_script(lineno, ...) msg_and_die_if_script(__VA_ARGS__)
Denis Vlasenkoc0ea3292009-04-10 21:22:02 +00001298# define syntax_error(lineno, msg) syntax_error(msg)
1299# define syntax_error_at(lineno, msg) syntax_error_at(msg)
1300# define syntax_error_unterm_ch(lineno, ch) syntax_error_unterm_ch(ch)
1301# define syntax_error_unterm_str(lineno, s) syntax_error_unterm_str(s)
1302# define syntax_error_unexpected_ch(lineno, ch) syntax_error_unexpected_ch(ch)
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001303#endif
1304
Denys Vlasenko39701202017-08-02 19:44:05 +02001305static void die_if_script(void)
1306{
1307 if (!G_interactive_fd) {
1308 if (G.last_exitcode) /* sometines it's 2, not 1 (bash compat) */
1309 xfunc_error_retval = G.last_exitcode;
1310 xfunc_die();
1311 }
1312}
1313
1314static void msg_and_die_if_script(unsigned lineno, const char *fmt, ...)
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001315{
Denis Vlasenkod68ae082009-04-09 20:41:34 +00001316 va_list p;
1317
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001318#if HUSH_DEBUG >= 2
1319 bb_error_msg("hush.c:%u", lineno);
1320#endif
Denis Vlasenkod68ae082009-04-09 20:41:34 +00001321 va_start(p, fmt);
1322 bb_verror_msg(fmt, p, NULL);
1323 va_end(p);
Denys Vlasenko39701202017-08-02 19:44:05 +02001324 die_if_script();
Mike Frysinger6379bb42009-03-28 18:55:03 +00001325}
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001326
Denys Vlasenkocecbc982011-03-30 18:54:52 +02001327static void syntax_error(unsigned lineno UNUSED_PARAM, const char *msg)
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001328{
1329 if (msg)
Denys Vlasenkocecbc982011-03-30 18:54:52 +02001330 bb_error_msg("syntax error: %s", msg);
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001331 else
Denys Vlasenkocecbc982011-03-30 18:54:52 +02001332 bb_error_msg("syntax error");
Denys Vlasenko39701202017-08-02 19:44:05 +02001333 die_if_script();
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001334}
1335
Denys Vlasenkocecbc982011-03-30 18:54:52 +02001336static void syntax_error_at(unsigned lineno UNUSED_PARAM, const char *msg)
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001337{
Denys Vlasenkocecbc982011-03-30 18:54:52 +02001338 bb_error_msg("syntax error at '%s'", msg);
Denys Vlasenko39701202017-08-02 19:44:05 +02001339 die_if_script();
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001340}
1341
Denys Vlasenkocecbc982011-03-30 18:54:52 +02001342static void syntax_error_unterm_str(unsigned lineno UNUSED_PARAM, const char *s)
Mike Frysinger6a46ab82009-06-01 14:14:36 -04001343{
Denys Vlasenkocecbc982011-03-30 18:54:52 +02001344 bb_error_msg("syntax error: unterminated %s", s);
Denys Vlasenko39701202017-08-02 19:44:05 +02001345//? source4.tests fails: in bash, echo ${^} in script does not terminate the script
1346// die_if_script();
Mike Frysinger6a46ab82009-06-01 14:14:36 -04001347}
1348
Denis Vlasenkod68ae082009-04-09 20:41:34 +00001349static void syntax_error_unterm_ch(unsigned lineno, char ch)
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001350{
Mike Frysinger6a46ab82009-06-01 14:14:36 -04001351 char msg[2] = { ch, '\0' };
1352 syntax_error_unterm_str(lineno, msg);
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001353}
1354
Denys Vlasenkocecbc982011-03-30 18:54:52 +02001355static void syntax_error_unexpected_ch(unsigned lineno UNUSED_PARAM, int ch)
Denis Vlasenkoc0ea3292009-04-10 21:22:02 +00001356{
1357 char msg[2];
1358 msg[0] = ch;
1359 msg[1] = '\0';
Denys Vlasenkob05bcaf2017-01-03 11:47:50 +01001360#if HUSH_DEBUG >= 2
1361 bb_error_msg("hush.c:%u", lineno);
1362#endif
Denys Vlasenkocecbc982011-03-30 18:54:52 +02001363 bb_error_msg("syntax error: unexpected %s", ch == EOF ? "EOF" : msg);
Denys Vlasenko39701202017-08-02 19:44:05 +02001364 die_if_script();
Denis Vlasenkoc0ea3292009-04-10 21:22:02 +00001365}
1366
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001367#if HUSH_DEBUG < 2
Denys Vlasenko39701202017-08-02 19:44:05 +02001368# undef msg_and_die_if_script
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001369# undef syntax_error
1370# undef syntax_error_at
Denis Vlasenkod68ae082009-04-09 20:41:34 +00001371# undef syntax_error_unterm_ch
1372# undef syntax_error_unterm_str
Denis Vlasenkoc0ea3292009-04-10 21:22:02 +00001373# undef syntax_error_unexpected_ch
Denis Vlasenko90e485c2007-05-23 15:22:50 +00001374#else
Denys Vlasenko39701202017-08-02 19:44:05 +02001375# define msg_and_die_if_script(...) msg_and_die_if_script(__LINE__, __VA_ARGS__)
Denis Vlasenkoc0ea3292009-04-10 21:22:02 +00001376# define syntax_error(msg) syntax_error(__LINE__, msg)
1377# define syntax_error_at(msg) syntax_error_at(__LINE__, msg)
1378# define syntax_error_unterm_ch(ch) syntax_error_unterm_ch(__LINE__, ch)
1379# define syntax_error_unterm_str(s) syntax_error_unterm_str(__LINE__, s)
1380# define syntax_error_unexpected_ch(ch) syntax_error_unexpected_ch(__LINE__, ch)
Denis Vlasenko90e485c2007-05-23 15:22:50 +00001381#endif
Eric Andersen25f27032001-04-26 23:22:31 +00001382
Denis Vlasenko552433b2009-04-04 19:29:21 +00001383
Mike Frysinger67c1c7b2009-04-24 06:26:18 +00001384#if ENABLE_HUSH_INTERACTIVE
1385static void cmdedit_update_prompt(void);
1386#else
Denys Vlasenko28a105d2009-06-01 11:26:30 +02001387# define cmdedit_update_prompt() ((void)0)
Mike Frysinger67c1c7b2009-04-24 06:26:18 +00001388#endif
1389
1390
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001391/* Utility functions
1392 */
Denis Vlasenko55789c62008-06-18 16:30:42 +00001393/* Replace each \x with x in place, return ptr past NUL. */
1394static char *unbackslash(char *src)
1395{
Denys Vlasenko71885402009-09-24 01:44:13 +02001396 char *dst = src = strchrnul(src, '\\');
Denis Vlasenko55789c62008-06-18 16:30:42 +00001397 while (1) {
1398 if (*src == '\\')
1399 src++;
1400 if ((*dst++ = *src++) == '\0')
1401 break;
1402 }
1403 return dst;
1404}
1405
Denis Vlasenko11fb7cf2009-03-20 10:13:08 +00001406static char **add_strings_to_strings(char **strings, char **add, int need_to_dup)
Denis Vlasenkod65ea392007-10-01 10:02:25 +00001407{
1408 int i;
1409 unsigned count1;
1410 unsigned count2;
1411 char **v;
1412
1413 v = strings;
1414 count1 = 0;
1415 if (v) {
1416 while (*v) {
1417 count1++;
1418 v++;
1419 }
1420 }
1421 count2 = 0;
1422 v = add;
1423 while (*v) {
1424 count2++;
1425 v++;
1426 }
1427 v = xrealloc(strings, (count1 + count2 + 1) * sizeof(char*));
1428 v[count1 + count2] = NULL;
1429 i = count2;
1430 while (--i >= 0)
Denis Vlasenko11fb7cf2009-03-20 10:13:08 +00001431 v[count1 + i] = (need_to_dup ? xstrdup(add[i]) : add[i]);
Denis Vlasenkod65ea392007-10-01 10:02:25 +00001432 return v;
1433}
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001434#if LEAK_HUNTING
Denis Vlasenkocc90f442009-04-08 16:40:34 +00001435static char **xx_add_strings_to_strings(int lineno, char **strings, char **add, int need_to_dup)
1436{
1437 char **ptr = add_strings_to_strings(strings, add, need_to_dup);
1438 fdprintf(2, "line %d: add_strings_to_strings %p\n", lineno, ptr);
1439 return ptr;
1440}
1441#define add_strings_to_strings(strings, add, need_to_dup) \
1442 xx_add_strings_to_strings(__LINE__, strings, add, need_to_dup)
1443#endif
Denis Vlasenkod65ea392007-10-01 10:02:25 +00001444
Denys Vlasenkocb6ff252009-05-04 00:14:30 +02001445/* Note: takes ownership of "add" ptr (it is not strdup'ed) */
Denis Vlasenko22d10a02008-10-13 08:53:43 +00001446static char **add_string_to_strings(char **strings, char *add)
Denis Vlasenkod65ea392007-10-01 10:02:25 +00001447{
1448 char *v[2];
Denis Vlasenkod65ea392007-10-01 10:02:25 +00001449 v[0] = add;
1450 v[1] = NULL;
Denis Vlasenko11fb7cf2009-03-20 10:13:08 +00001451 return add_strings_to_strings(strings, v, /*dup:*/ 0);
Denis Vlasenko22d10a02008-10-13 08:53:43 +00001452}
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00001453#if LEAK_HUNTING
Denis Vlasenkocc90f442009-04-08 16:40:34 +00001454static char **xx_add_string_to_strings(int lineno, char **strings, char *add)
1455{
1456 char **ptr = add_string_to_strings(strings, add);
1457 fdprintf(2, "line %d: add_string_to_strings %p\n", lineno, ptr);
1458 return ptr;
1459}
1460#define add_string_to_strings(strings, add) \
1461 xx_add_string_to_strings(__LINE__, strings, add)
1462#endif
Denis Vlasenkod65ea392007-10-01 10:02:25 +00001463
Denys Vlasenkoacdc49c2009-05-04 01:58:10 +02001464static void free_strings(char **strings)
Denis Vlasenkod65ea392007-10-01 10:02:25 +00001465{
Denis Vlasenkoafd7a8d2008-10-09 16:29:44 +00001466 char **v;
1467
1468 if (!strings)
1469 return;
Denis Vlasenkoafd7a8d2008-10-09 16:29:44 +00001470 v = strings;
1471 while (*v) {
Denys Vlasenkoacdc49c2009-05-04 01:58:10 +02001472 free(*v);
1473 v++;
Denis Vlasenkod65ea392007-10-01 10:02:25 +00001474 }
Denis Vlasenkoafd7a8d2008-10-09 16:29:44 +00001475 free(strings);
Denis Vlasenkod65ea392007-10-01 10:02:25 +00001476}
1477
Denys Vlasenko2db74612017-07-07 22:07:28 +02001478static int fcntl_F_DUPFD(int fd, int avoid_fd)
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02001479{
Denys Vlasenko2db74612017-07-07 22:07:28 +02001480 int newfd;
1481 repeat:
1482 newfd = fcntl(fd, F_DUPFD, avoid_fd + 1);
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02001483 if (newfd < 0) {
Denys Vlasenko2db74612017-07-07 22:07:28 +02001484 if (errno == EBUSY)
1485 goto repeat;
1486 if (errno == EINTR)
1487 goto repeat;
1488 }
1489 return newfd;
1490}
1491
Denys Vlasenko657e9002017-07-30 23:34:04 +02001492static int xdup_CLOEXEC_and_close(int fd, int avoid_fd)
Denys Vlasenko2db74612017-07-07 22:07:28 +02001493{
1494 int newfd;
1495 repeat:
Denys Vlasenko657e9002017-07-30 23:34:04 +02001496 newfd = fcntl(fd, F_DUPFD_CLOEXEC, avoid_fd + 1);
Denys Vlasenko2db74612017-07-07 22:07:28 +02001497 if (newfd < 0) {
1498 if (errno == EBUSY)
1499 goto repeat;
1500 if (errno == EINTR)
1501 goto repeat;
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02001502 /* fd was not open? */
1503 if (errno == EBADF)
1504 return fd;
1505 xfunc_die();
1506 }
Denys Vlasenko657e9002017-07-30 23:34:04 +02001507 if (F_DUPFD_CLOEXEC == F_DUPFD) /* if old libc (w/o F_DUPFD_CLOEXEC) */
1508 fcntl(newfd, F_SETFD, FD_CLOEXEC);
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02001509 close(fd);
1510 return newfd;
1511}
1512
1513
Denys Vlasenko7b25b1c2016-08-20 15:58:34 +02001514/* Manipulating the list of open FILEs */
1515static FILE *remember_FILE(FILE *fp)
1516{
1517 if (fp) {
Denys Vlasenko7b25b1c2016-08-20 15:58:34 +02001518 struct FILE_list *n = xmalloc(sizeof(*n));
Denys Vlasenko7b25b1c2016-08-20 15:58:34 +02001519 n->next = G.FILE_list;
1520 G.FILE_list = n;
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02001521 n->fp = fp;
1522 n->fd = fileno(fp);
1523 close_on_exec_on(n->fd);
Denys Vlasenko7b25b1c2016-08-20 15:58:34 +02001524 }
1525 return fp;
1526}
Denys Vlasenko7b25b1c2016-08-20 15:58:34 +02001527static void fclose_and_forget(FILE *fp)
1528{
1529 struct FILE_list **pp = &G.FILE_list;
1530 while (*pp) {
1531 struct FILE_list *cur = *pp;
1532 if (cur->fp == fp) {
1533 *pp = cur->next;
1534 free(cur);
1535 break;
1536 }
1537 pp = &cur->next;
1538 }
1539 fclose(fp);
1540}
Denys Vlasenko2db74612017-07-07 22:07:28 +02001541static int save_FILEs_on_redirect(int fd, int avoid_fd)
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02001542{
1543 struct FILE_list *fl = G.FILE_list;
1544 while (fl) {
1545 if (fd == fl->fd) {
1546 /* We use it only on script files, they are all CLOEXEC */
Denys Vlasenko657e9002017-07-30 23:34:04 +02001547 fl->fd = xdup_CLOEXEC_and_close(fd, avoid_fd);
Denys Vlasenko2db74612017-07-07 22:07:28 +02001548 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 +02001549 return 1;
1550 }
1551 fl = fl->next;
1552 }
1553 return 0;
1554}
1555static void restore_redirected_FILEs(void)
1556{
1557 struct FILE_list *fl = G.FILE_list;
1558 while (fl) {
1559 int should_be = fileno(fl->fp);
1560 if (fl->fd != should_be) {
Denys Vlasenko2db74612017-07-07 22:07:28 +02001561 debug_printf_redir("restoring script fd from %d to %d\n", fl->fd, should_be);
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02001562 xmove_fd(fl->fd, should_be);
1563 fl->fd = should_be;
1564 }
1565 fl = fl->next;
1566 }
1567}
Denys Vlasenko4ee824f2017-07-03 01:22:13 +02001568#if ENABLE_FEATURE_SH_STANDALONE && BB_MMU
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02001569static void close_all_FILE_list(void)
1570{
1571 struct FILE_list *fl = G.FILE_list;
1572 while (fl) {
1573 /* fclose would also free FILE object.
1574 * It is disastrous if we share memory with a vforked parent.
1575 * I'm not sure we never come here after vfork.
1576 * Therefore just close fd, nothing more.
1577 */
1578 /*fclose(fl->fp); - unsafe */
1579 close(fl->fd);
1580 fl = fl->next;
1581 }
1582}
Denys Vlasenko7b25b1c2016-08-20 15:58:34 +02001583#endif
Denys Vlasenko32fdf2f2017-07-31 04:32:06 +02001584static int fd_in_FILEs(int fd)
1585{
1586 struct FILE_list *fl = G.FILE_list;
1587 while (fl) {
1588 if (fl->fd == fd)
1589 return 1;
1590 fl = fl->next;
1591 }
1592 return 0;
1593}
Denys Vlasenko7b25b1c2016-08-20 15:58:34 +02001594
1595
Denis Vlasenko270b1c32009-04-17 18:54:50 +00001596/* Helpers for setting new $n and restoring them back
1597 */
1598typedef struct save_arg_t {
1599 char *sv_argv0;
1600 char **sv_g_argv;
1601 int sv_g_argc;
Denys Vlasenko4e4f88e2017-01-09 07:57:38 +01001602 IF_HUSH_SET(smallint sv_g_malloced;)
Denis Vlasenko270b1c32009-04-17 18:54:50 +00001603} save_arg_t;
1604
1605static void save_and_replace_G_args(save_arg_t *sv, char **argv)
1606{
Denis Vlasenko270b1c32009-04-17 18:54:50 +00001607 sv->sv_argv0 = argv[0];
1608 sv->sv_g_argv = G.global_argv;
1609 sv->sv_g_argc = G.global_argc;
Denys Vlasenko4e4f88e2017-01-09 07:57:38 +01001610 IF_HUSH_SET(sv->sv_g_malloced = G.global_args_malloced;)
Denis Vlasenko270b1c32009-04-17 18:54:50 +00001611
1612 argv[0] = G.global_argv[0]; /* retain $0 */
1613 G.global_argv = argv;
Denys Vlasenko4e4f88e2017-01-09 07:57:38 +01001614 IF_HUSH_SET(G.global_args_malloced = 0;)
Denis Vlasenko270b1c32009-04-17 18:54:50 +00001615
Denys Vlasenkod4e4fdb2017-07-03 21:31:16 +02001616 G.global_argc = 1 + string_array_len(argv + 1);
Denis Vlasenko270b1c32009-04-17 18:54:50 +00001617}
1618
1619static void restore_G_args(save_arg_t *sv, char **argv)
1620{
Denys Vlasenko4e4f88e2017-01-09 07:57:38 +01001621#if ENABLE_HUSH_SET
Denis Vlasenko270b1c32009-04-17 18:54:50 +00001622 if (G.global_args_malloced) {
1623 /* someone ran "set -- arg1 arg2 ...", undo */
Denys Vlasenko4e4f88e2017-01-09 07:57:38 +01001624 char **pp = G.global_argv;
Denis Vlasenko270b1c32009-04-17 18:54:50 +00001625 while (*++pp) /* note: does not free $0 */
1626 free(*pp);
1627 free(G.global_argv);
1628 }
Denys Vlasenko4e4f88e2017-01-09 07:57:38 +01001629#endif
Denis Vlasenko270b1c32009-04-17 18:54:50 +00001630 argv[0] = sv->sv_argv0;
1631 G.global_argv = sv->sv_g_argv;
1632 G.global_argc = sv->sv_g_argc;
Denys Vlasenko4e4f88e2017-01-09 07:57:38 +01001633 IF_HUSH_SET(G.global_args_malloced = sv->sv_g_malloced;)
Denis Vlasenko270b1c32009-04-17 18:54:50 +00001634}
1635
1636
Denis Vlasenkod5762932009-03-31 11:22:57 +00001637/* Basic theory of signal handling in shell
1638 * ========================================
Denis Vlasenko7b830e72009-03-31 13:05:32 +00001639 * This does not describe what hush does, rather, it is current understanding
1640 * what it _should_ do. If it doesn't, it's a bug.
Denis Vlasenkod5762932009-03-31 11:22:57 +00001641 * http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#trap
1642 *
1643 * Signals are handled only after each pipe ("cmd | cmd | cmd" thing)
1644 * is finished or backgrounded. It is the same in interactive and
1645 * non-interactive shells, and is the same regardless of whether
Denis Vlasenko7b830e72009-03-31 13:05:32 +00001646 * a user trap handler is installed or a shell special one is in effect.
Denys Vlasenko69b1cef2009-09-21 10:21:44 +02001647 * ^C or ^Z from keyboard seems to execute "at once" because it usually
Denis Vlasenkod5762932009-03-31 11:22:57 +00001648 * backgrounds (i.e. stops) or kills all members of currently running
1649 * pipe.
1650 *
Denys Vlasenko8bd810b2013-11-28 01:50:01 +01001651 * Wait builtin is interruptible by signals for which user trap is set
Denis Vlasenkod5762932009-03-31 11:22:57 +00001652 * or by SIGINT in interactive shell.
1653 *
1654 * Trap handlers will execute even within trap handlers. (right?)
1655 *
Denys Vlasenkoe89a2412010-01-12 15:19:31 +01001656 * User trap handlers are forgotten when subshell ("(cmd)") is entered,
1657 * except for handlers set to '' (empty string).
Denis Vlasenkod5762932009-03-31 11:22:57 +00001658 *
1659 * If job control is off, backgrounded commands ("cmd &")
Denis Vlasenko7b830e72009-03-31 13:05:32 +00001660 * have SIGINT, SIGQUIT set to SIG_IGN.
Denis Vlasenkod5762932009-03-31 11:22:57 +00001661 *
Denys Vlasenko28a105d2009-06-01 11:26:30 +02001662 * Commands which are run in command substitution ("`cmd`")
Denis Vlasenko7b830e72009-03-31 13:05:32 +00001663 * have SIGTTIN, SIGTTOU, SIGTSTP set to SIG_IGN.
Denis Vlasenkod5762932009-03-31 11:22:57 +00001664 *
Denys Vlasenko4b7db4f2009-05-29 10:39:06 +02001665 * Ordinary commands have signals set to SIG_IGN/DFL as inherited
Denis Vlasenko7b830e72009-03-31 13:05:32 +00001666 * by the shell from its parent.
Denis Vlasenkod5762932009-03-31 11:22:57 +00001667 *
Denys Vlasenko28a105d2009-06-01 11:26:30 +02001668 * Signals which differ from SIG_DFL action
Denis Vlasenko7b830e72009-03-31 13:05:32 +00001669 * (note: child (i.e., [v]forked) shell is not an interactive shell):
Denis Vlasenkod5762932009-03-31 11:22:57 +00001670 *
1671 * SIGQUIT: ignore
1672 * SIGTERM (interactive): ignore
Denis Vlasenko7b830e72009-03-31 13:05:32 +00001673 * SIGHUP (interactive):
1674 * send SIGCONT to stopped jobs, send SIGHUP to all jobs and exit
Denis Vlasenkod5762932009-03-31 11:22:57 +00001675 * SIGTTIN, SIGTTOU, SIGTSTP (if job control is on): ignore
Denis Vlasenkoc4ada792009-04-15 23:29:00 +00001676 * Note that ^Z is handled not by trapping SIGTSTP, but by seeing
1677 * that all pipe members are stopped. Try this in bash:
1678 * while :; do :; done - ^Z does not background it
1679 * (while :; do :; done) - ^Z backgrounds it
Denis Vlasenkod5762932009-03-31 11:22:57 +00001680 * SIGINT (interactive): wait for last pipe, ignore the rest
Denis Vlasenko7b830e72009-03-31 13:05:32 +00001681 * of the command line, show prompt. NB: ^C does not send SIGINT
1682 * to interactive shell while shell is waiting for a pipe,
1683 * since shell is bg'ed (is not in foreground process group).
Denis Vlasenko7b830e72009-03-31 13:05:32 +00001684 * Example 1: this waits 5 sec, but does not execute ls:
1685 * "echo $$; sleep 5; ls -l" + "kill -INT <pid>"
1686 * Example 2: this does not wait and does not execute ls:
1687 * "echo $$; sleep 5 & wait; ls -l" + "kill -INT <pid>"
1688 * Example 3: this does not wait 5 sec, but executes ls:
1689 * "sleep 5; ls -l" + press ^C
Denys Vlasenkob8709032011-05-08 21:20:01 +02001690 * Example 4: this does not wait and does not execute ls:
1691 * "sleep 5 & wait; ls -l" + press ^C
Denis Vlasenkod5762932009-03-31 11:22:57 +00001692 *
1693 * (What happens to signals which are IGN on shell start?)
1694 * (What happens with signal mask on shell start?)
1695 *
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001696 * Old implementation
1697 * ==================
Denis Vlasenkod5762932009-03-31 11:22:57 +00001698 * We use in-kernel pending signal mask to determine which signals were sent.
1699 * We block all signals which we don't want to take action immediately,
1700 * i.e. we block all signals which need to have special handling as described
1701 * above, and all signals which have traps set.
1702 * After each pipe execution, we extract any pending signals via sigtimedwait()
1703 * and act on them.
1704 *
Denys Vlasenko10c01312011-05-11 11:49:21 +02001705 * unsigned special_sig_mask: a mask of such "special" signals
Denis Vlasenkod5762932009-03-31 11:22:57 +00001706 * sigset_t blocked_set: current blocked signal set
1707 *
Denis Vlasenko7b830e72009-03-31 13:05:32 +00001708 * "trap - SIGxxx":
Denys Vlasenko10c01312011-05-11 11:49:21 +02001709 * clear bit in blocked_set unless it is also in special_sig_mask
Denis Vlasenko7b830e72009-03-31 13:05:32 +00001710 * "trap 'cmd' SIGxxx":
1711 * set bit in blocked_set (even if 'cmd' is '')
Denis Vlasenkod5762932009-03-31 11:22:57 +00001712 * after [v]fork, if we plan to be a shell:
Denis Vlasenko6b9e0532009-04-18 01:23:21 +00001713 * unblock signals with special interactive handling
1714 * (child shell is not interactive),
Denys Vlasenkoe89a2412010-01-12 15:19:31 +01001715 * unset all traps except '' (note: regardless of child shell's type - {}, (), etc)
Denis Vlasenkod5762932009-03-31 11:22:57 +00001716 * after [v]fork, if we plan to exec:
Denys Vlasenko69b1cef2009-09-21 10:21:44 +02001717 * POSIX says fork clears pending signal mask in child - no need to clear it.
Denis Vlasenko7b830e72009-03-31 13:05:32 +00001718 * Restore blocked signal set to one inherited by shell just prior to exec.
Denis Vlasenkod5762932009-03-31 11:22:57 +00001719 *
Denis Vlasenko7566bae2009-03-31 17:24:49 +00001720 * Note: as a result, we do not use signal handlers much. The only uses
Denys Vlasenko8d7be232009-05-25 16:38:32 +02001721 * are to count SIGCHLDs
Denis Vlasenko7566bae2009-03-31 17:24:49 +00001722 * and to restore tty pgrp on signal-induced exit.
Denys Vlasenko4ea0ca82009-09-25 12:58:37 +02001723 *
Denys Vlasenko67f71862009-09-25 14:21:06 +02001724 * Note 2 (compat):
Denys Vlasenko4ea0ca82009-09-25 12:58:37 +02001725 * Standard says "When a subshell is entered, traps that are not being ignored
1726 * are set to the default actions". bash interprets it so that traps which
Denys Vlasenkoe89a2412010-01-12 15:19:31 +01001727 * are set to '' (ignore) are NOT reset to defaults. We do the same.
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001728 *
1729 * Problem: the above approach makes it unwieldy to catch signals while
Denys Vlasenkoe95738f2013-07-08 03:13:08 +02001730 * we are in read builtin, or while we read commands from stdin:
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001731 * masked signals are not visible!
1732 *
1733 * New implementation
1734 * ==================
1735 * We record each signal we are interested in by installing signal handler
1736 * for them - a bit like emulating kernel pending signal mask in userspace.
1737 * We are interested in: signals which need to have special handling
1738 * as described above, and all signals which have traps set.
Denys Vlasenko8bd810b2013-11-28 01:50:01 +01001739 * Signals are recorded in pending_set.
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001740 * After each pipe execution, we extract any pending signals
1741 * and act on them.
1742 *
1743 * unsigned special_sig_mask: a mask of shell-special signals.
1744 * unsigned fatal_sig_mask: a mask of signals on which we restore tty pgrp.
1745 * char *traps[sig] if trap for sig is set (even if it's '').
1746 * sigset_t pending_set: set of sigs we received.
1747 *
1748 * "trap - SIGxxx":
1749 * if sig is in special_sig_mask, set handler back to:
1750 * record_pending_signo, or to IGN if it's a tty stop signal
1751 * if sig is in fatal_sig_mask, set handler back to sigexit.
1752 * else: set handler back to SIG_DFL
1753 * "trap 'cmd' SIGxxx":
1754 * set handler to record_pending_signo.
1755 * "trap '' SIGxxx":
1756 * set handler to SIG_IGN.
1757 * after [v]fork, if we plan to be a shell:
1758 * set signals with special interactive handling to SIG_DFL
1759 * (because child shell is not interactive),
1760 * unset all traps except '' (note: regardless of child shell's type - {}, (), etc)
1761 * after [v]fork, if we plan to exec:
1762 * POSIX says fork clears pending signal mask in child - no need to clear it.
1763 *
1764 * To make wait builtin interruptible, we handle SIGCHLD as special signal,
1765 * otherwise (if we leave it SIG_DFL) sigsuspend in wait builtin will not wake up on it.
1766 *
1767 * Note (compat):
1768 * Standard says "When a subshell is entered, traps that are not being ignored
1769 * are set to the default actions". bash interprets it so that traps which
1770 * are set to '' (ignore) are NOT reset to defaults. We do the same.
Denis Vlasenkod5762932009-03-31 11:22:57 +00001771 */
Denis Vlasenkoe4bd4f22009-04-17 13:52:51 +00001772enum {
1773 SPECIAL_INTERACTIVE_SIGS = 0
Denis Vlasenkoe4bd4f22009-04-17 13:52:51 +00001774 | (1 << SIGTERM)
Denis Vlasenkoe4bd4f22009-04-17 13:52:51 +00001775 | (1 << SIGINT)
Denis Vlasenkoc8653f62009-04-27 23:29:14 +00001776 | (1 << SIGHUP)
1777 ,
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001778 SPECIAL_JOBSTOP_SIGS = 0
Mike Frysinger38478a62009-05-20 04:48:06 -04001779#if ENABLE_HUSH_JOB
Denis Vlasenkoc8653f62009-04-27 23:29:14 +00001780 | (1 << SIGTTIN)
1781 | (1 << SIGTTOU)
1782 | (1 << SIGTSTP)
1783#endif
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001784 ,
Denis Vlasenkoe4bd4f22009-04-17 13:52:51 +00001785};
Denis Vlasenkod5762932009-03-31 11:22:57 +00001786
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001787static void record_pending_signo(int sig)
Denys Vlasenko54e9e122011-05-09 00:52:15 +02001788{
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001789 sigaddset(&G.pending_set, sig);
Denys Vlasenko8d7be232009-05-25 16:38:32 +02001790#if ENABLE_HUSH_FAST
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001791 if (sig == SIGCHLD) {
1792 G.count_SIGCHLD++;
Denys Vlasenko8d7be232009-05-25 16:38:32 +02001793//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 +02001794 }
Denys Vlasenko8d7be232009-05-25 16:38:32 +02001795#endif
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001796}
Denis Vlasenko7566bae2009-03-31 17:24:49 +00001797
Denys Vlasenko0806e402011-05-12 23:06:20 +02001798static sighandler_t install_sighandler(int sig, sighandler_t handler)
1799{
1800 struct sigaction old_sa;
1801
1802 /* We could use signal() to install handlers... almost:
1803 * except that we need to mask ALL signals while handlers run.
1804 * I saw signal nesting in strace, race window isn't small.
1805 * SA_RESTART is also needed, but in Linux, signal()
1806 * sets SA_RESTART too.
1807 */
1808 /* memset(&G.sa, 0, sizeof(G.sa)); - already done */
1809 /* sigfillset(&G.sa.sa_mask); - already done */
1810 /* G.sa.sa_flags = SA_RESTART; - already done */
1811 G.sa.sa_handler = handler;
1812 sigaction(sig, &G.sa, &old_sa);
1813 return old_sa.sa_handler;
1814}
1815
Denys Vlasenkoe9abe752016-08-19 20:15:26 +02001816static void hush_exit(int exitcode) NORETURN;
Denys Vlasenkoe9abe752016-08-19 20:15:26 +02001817
Denys Vlasenkob6afcc72016-12-12 16:30:20 +01001818static void restore_ttypgrp_and__exit(void) NORETURN;
Denys Vlasenkoe9abe752016-08-19 20:15:26 +02001819static void restore_ttypgrp_and__exit(void)
1820{
1821 /* xfunc has failed! die die die */
1822 /* no EXIT traps, this is an escape hatch! */
1823 G.exiting = 1;
1824 hush_exit(xfunc_error_retval);
1825}
1826
Denys Vlasenkob6afcc72016-12-12 16:30:20 +01001827#if ENABLE_HUSH_JOB
1828
Denys Vlasenkoe9abe752016-08-19 20:15:26 +02001829/* Needed only on some libc:
1830 * It was observed that on exit(), fgetc'ed buffered data
1831 * gets "unwound" via lseek(fd, -NUM, SEEK_CUR).
1832 * With the net effect that even after fork(), not vfork(),
1833 * exit() in NOEXECed applet in "sh SCRIPT":
1834 * noexec_applet_here
1835 * echo END_OF_SCRIPT
1836 * lseeks fd in input FILE object from EOF to "e" in "echo END_OF_SCRIPT".
1837 * This makes "echo END_OF_SCRIPT" executed twice.
Denys Vlasenko39701202017-08-02 19:44:05 +02001838 * Similar problems can be seen with msg_and_die_if_script() -> xfunc_die()
Denys Vlasenkoe9abe752016-08-19 20:15:26 +02001839 * and in `cmd` handling.
1840 * If set as die_func(), this makes xfunc_die() exit via _exit(), not exit():
1841 */
Denys Vlasenkob6afcc72016-12-12 16:30:20 +01001842static void fflush_and__exit(void) NORETURN;
Denys Vlasenkoe9abe752016-08-19 20:15:26 +02001843static void fflush_and__exit(void)
1844{
1845 fflush_all();
1846 _exit(xfunc_error_retval);
1847}
1848
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00001849/* After [v]fork, in child: do not restore tty pgrp on xfunc death */
Denys Vlasenkoe9abe752016-08-19 20:15:26 +02001850# define disable_restore_tty_pgrp_on_exit() (die_func = fflush_and__exit)
Denis Vlasenko25af86f2009-04-07 13:29:27 +00001851/* After [v]fork, in parent: restore tty pgrp on xfunc death */
Denys Vlasenkoe9abe752016-08-19 20:15:26 +02001852# define enable_restore_tty_pgrp_on_exit() (die_func = restore_ttypgrp_and__exit)
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00001853
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00001854/* Restores tty foreground process group, and exits.
1855 * May be called as signal handler for fatal signal
Denis Vlasenko6b9e0532009-04-18 01:23:21 +00001856 * (will resend signal to itself, producing correct exit state)
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00001857 * or called directly with -EXITCODE.
Denys Vlasenkoe9abe752016-08-19 20:15:26 +02001858 * We also call it if xfunc is exiting.
1859 */
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +00001860static void sigexit(int sig) NORETURN;
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00001861static void sigexit(int sig)
1862{
Denis Vlasenkoabedaac2009-03-31 12:03:40 +00001863 /* Careful: we can end up here after [v]fork. Do not restore
Denis Vlasenko7b830e72009-03-31 13:05:32 +00001864 * tty pgrp then, only top-level shell process does that */
Denys Vlasenkoebc1ee22011-05-12 10:59:18 +02001865 if (G_saved_tty_pgrp && getpid() == G.root_pid) {
1866 /* Disable all signals: job control, SIGPIPE, etc.
1867 * Mostly paranoid measure, to prevent infinite SIGTTOU.
1868 */
1869 sigprocmask_allsigs(SIG_BLOCK);
Mike Frysinger38478a62009-05-20 04:48:06 -04001870 tcsetpgrp(G_interactive_fd, G_saved_tty_pgrp);
Denys Vlasenkoebc1ee22011-05-12 10:59:18 +02001871 }
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00001872
1873 /* Not a signal, just exit */
1874 if (sig <= 0)
1875 _exit(- sig);
1876
Denis Vlasenko400d8bb2008-02-24 13:36:01 +00001877 kill_myself_with_sig(sig); /* does not return */
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00001878}
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00001879#else
1880
Denys Vlasenko8391c482010-05-22 17:50:43 +02001881# define disable_restore_tty_pgrp_on_exit() ((void)0)
1882# define enable_restore_tty_pgrp_on_exit() ((void)0)
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00001883
Denis Vlasenkoe0755e52009-04-03 21:16:45 +00001884#endif
Denis Vlasenkob81b3df2007-04-28 16:48:04 +00001885
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001886static sighandler_t pick_sighandler(unsigned sig)
1887{
1888 sighandler_t handler = SIG_DFL;
1889 if (sig < sizeof(unsigned)*8) {
1890 unsigned sigmask = (1 << sig);
1891
1892#if ENABLE_HUSH_JOB
Denys Vlasenko75e77de2011-05-12 13:12:47 +02001893 /* is sig fatal? */
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001894 if (G_fatal_sig_mask & sigmask)
1895 handler = sigexit;
Denys Vlasenko75e77de2011-05-12 13:12:47 +02001896 else
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001897#endif
1898 /* sig has special handling? */
Denys Vlasenko75e77de2011-05-12 13:12:47 +02001899 if (G.special_sig_mask & sigmask) {
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001900 handler = record_pending_signo;
Denys Vlasenko0c40a732011-05-12 09:50:12 +02001901 /* TTIN/TTOU/TSTP can't be set to record_pending_signo
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001902 * in order to ignore them: they will be raised
Denys Vlasenkof58f7052011-05-12 02:10:33 +02001903 * in an endless loop when we try to do some
1904 * terminal ioctls! We do have to _ignore_ these.
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001905 */
1906 if (SPECIAL_JOBSTOP_SIGS & sigmask)
1907 handler = SIG_IGN;
Denys Vlasenko0c40a732011-05-12 09:50:12 +02001908 }
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001909 }
1910 return handler;
1911}
1912
Mike Frysinger9f8128f2009-03-29 23:49:37 +00001913/* Restores tty foreground process group, and exits. */
Mike Frysinger9f8128f2009-03-29 23:49:37 +00001914static void hush_exit(int exitcode)
1915{
Denys Vlasenkobede2152011-09-04 16:12:33 +02001916#if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
1917 save_history(G.line_input_state);
1918#endif
1919
Denys Vlasenko8ee2ada2011-02-07 02:03:51 +01001920 fflush_all();
Denys Vlasenko7a85c602017-01-08 17:40:18 +01001921 if (G.exiting <= 0 && G_traps && G_traps[0] && G_traps[0][0]) {
Denys Vlasenko27c56f12010-09-07 09:56:34 +02001922 char *argv[3];
1923 /* argv[0] is unused */
Denys Vlasenko7a85c602017-01-08 17:40:18 +01001924 argv[1] = G_traps[0];
Denys Vlasenko27c56f12010-09-07 09:56:34 +02001925 argv[2] = NULL;
Denys Vlasenkoa110c902010-09-12 15:38:04 +02001926 G.exiting = 1; /* prevent EXIT trap recursion */
Denys Vlasenko7a85c602017-01-08 17:40:18 +01001927 /* Note: G_traps[0] is not cleared!
Denys Vlasenkode8c3f62010-09-12 16:13:44 +02001928 * "trap" will still show it, if executed
1929 * in the handler */
1930 builtin_eval(argv);
Denis Vlasenkod5762932009-03-31 11:22:57 +00001931 }
Mike Frysinger9f8128f2009-03-29 23:49:37 +00001932
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01001933#if ENABLE_FEATURE_CLEAN_UP
1934 {
1935 struct variable *cur_var;
1936 if (G.cwd != bb_msg_unknown)
1937 free((char*)G.cwd);
1938 cur_var = G.top_var;
1939 while (cur_var) {
1940 struct variable *tmp = cur_var;
1941 if (!cur_var->max_len)
1942 free(cur_var->varstr);
1943 cur_var = cur_var->next;
1944 free(tmp);
1945 }
1946 }
1947#endif
1948
Denys Vlasenko8131eea2009-11-02 14:19:51 +01001949 fflush_all();
Denys Vlasenko215b0ca2016-08-19 18:23:56 +02001950#if ENABLE_HUSH_JOB
Denis Vlasenkoabedaac2009-03-31 12:03:40 +00001951 sigexit(- (exitcode & 0xff));
1952#else
Denys Vlasenko215b0ca2016-08-19 18:23:56 +02001953 _exit(exitcode);
Denis Vlasenkoabedaac2009-03-31 12:03:40 +00001954#endif
Mike Frysinger9f8128f2009-03-29 23:49:37 +00001955}
1956
Denys Vlasenkoacd5bc82010-09-12 15:05:39 +02001957
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001958//TODO: return a mask of ALL handled sigs?
1959static int check_and_run_traps(void)
Denis Vlasenko6b9e0532009-04-18 01:23:21 +00001960{
Denis Vlasenko6b9e0532009-04-18 01:23:21 +00001961 int last_sig = 0;
1962
Denis Vlasenko6b9e0532009-04-18 01:23:21 +00001963 while (1) {
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001964 int sig;
Denys Vlasenko80542ba2011-05-08 21:23:43 +02001965
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001966 if (sigisemptyset(&G.pending_set))
Denis Vlasenko6b9e0532009-04-18 01:23:21 +00001967 break;
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001968 sig = 0;
1969 do {
1970 sig++;
1971 if (sigismember(&G.pending_set, sig)) {
1972 sigdelset(&G.pending_set, sig);
1973 goto got_sig;
1974 }
1975 } while (sig < NSIG);
1976 break;
Denys Vlasenkob8709032011-05-08 21:20:01 +02001977 got_sig:
Denys Vlasenko7a85c602017-01-08 17:40:18 +01001978 if (G_traps && G_traps[sig]) {
Denys Vlasenko04b46bc2016-10-01 22:28:03 +02001979 debug_printf_exec("%s: sig:%d handler:'%s'\n", __func__, sig, G.traps[sig]);
Denys Vlasenko7a85c602017-01-08 17:40:18 +01001980 if (G_traps[sig][0]) {
Denis Vlasenko6b9e0532009-04-18 01:23:21 +00001981 /* We have user-defined handler */
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02001982 smalluint save_rcode;
Denys Vlasenko27c56f12010-09-07 09:56:34 +02001983 char *argv[3];
1984 /* argv[0] is unused */
Denys Vlasenko7a85c602017-01-08 17:40:18 +01001985 argv[1] = G_traps[sig];
Denys Vlasenko27c56f12010-09-07 09:56:34 +02001986 argv[2] = NULL;
Denis Vlasenko6b9e0532009-04-18 01:23:21 +00001987 save_rcode = G.last_exitcode;
1988 builtin_eval(argv);
Denys Vlasenko8660aeb2016-11-24 17:44:02 +01001989//FIXME: shouldn't it be set to 128 + sig instead?
Denis Vlasenko6b9e0532009-04-18 01:23:21 +00001990 G.last_exitcode = save_rcode;
Denys Vlasenkob8709032011-05-08 21:20:01 +02001991 last_sig = sig;
Denis Vlasenko6b9e0532009-04-18 01:23:21 +00001992 } /* else: "" trap, ignoring signal */
1993 continue;
1994 }
1995 /* not a trap: special action */
1996 switch (sig) {
Denis Vlasenko6b9e0532009-04-18 01:23:21 +00001997 case SIGINT:
Denys Vlasenko04b46bc2016-10-01 22:28:03 +02001998 debug_printf_exec("%s: sig:%d default SIGINT handler\n", __func__, sig);
Denis Vlasenko6b9e0532009-04-18 01:23:21 +00001999 G.flag_SIGINT = 1;
Denys Vlasenkob8709032011-05-08 21:20:01 +02002000 last_sig = sig;
Denis Vlasenko6b9e0532009-04-18 01:23:21 +00002001 break;
2002#if ENABLE_HUSH_JOB
2003 case SIGHUP: {
Denys Vlasenko49e6bf22017-08-04 14:28:16 +02002004//TODO: why are we doing this? ash and dash don't do this,
2005//they have no handler for SIGHUP at all,
2006//they rely on kernel to send SIGHUP+SIGCONT to orphaned process groups
Denis Vlasenko6b9e0532009-04-18 01:23:21 +00002007 struct pipe *job;
Denys Vlasenko04b46bc2016-10-01 22:28:03 +02002008 debug_printf_exec("%s: sig:%d default SIGHUP handler\n", __func__, sig);
Denis Vlasenko6b9e0532009-04-18 01:23:21 +00002009 /* bash is observed to signal whole process groups,
2010 * not individual processes */
2011 for (job = G.job_list; job; job = job->next) {
2012 if (job->pgrp <= 0)
2013 continue;
2014 debug_printf_exec("HUPing pgrp %d\n", job->pgrp);
2015 if (kill(- job->pgrp, SIGHUP) == 0)
2016 kill(- job->pgrp, SIGCONT);
2017 }
2018 sigexit(SIGHUP);
2019 }
2020#endif
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02002021#if ENABLE_HUSH_FAST
2022 case SIGCHLD:
Denys Vlasenko04b46bc2016-10-01 22:28:03 +02002023 debug_printf_exec("%s: sig:%d default SIGCHLD handler\n", __func__, sig);
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02002024 G.count_SIGCHLD++;
2025//bb_error_msg("[%d] check_and_run_traps: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD);
2026 /* Note:
Denys Vlasenko10ad6222017-04-17 16:13:32 +02002027 * We don't do 'last_sig = sig' here -> NOT returning this sig.
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02002028 * This simplifies wait builtin a bit.
2029 */
2030 break;
2031#endif
Denis Vlasenko6b9e0532009-04-18 01:23:21 +00002032 default: /* ignored: */
Denys Vlasenko04b46bc2016-10-01 22:28:03 +02002033 debug_printf_exec("%s: sig:%d default handling is to ignore\n", __func__, sig);
Denis Vlasenko6b9e0532009-04-18 01:23:21 +00002034 /* SIGTERM, SIGQUIT, SIGTTIN, SIGTTOU, SIGTSTP */
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02002035 /* Note:
Denys Vlasenko10ad6222017-04-17 16:13:32 +02002036 * We don't do 'last_sig = sig' here -> NOT returning this sig.
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02002037 * Example: wait is not interrupted by TERM
Denys Vlasenkob8709032011-05-08 21:20:01 +02002038 * in interactive shell, because TERM is ignored.
2039 */
Denis Vlasenko6b9e0532009-04-18 01:23:21 +00002040 break;
2041 }
2042 }
2043 return last_sig;
2044}
2045
Denis Vlasenkob81b3df2007-04-28 16:48:04 +00002046
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02002047static const char *get_cwd(int force)
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00002048{
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02002049 if (force || G.cwd == NULL) {
2050 /* xrealloc_getcwd_or_warn(arg) calls free(arg),
2051 * we must not try to free(bb_msg_unknown) */
2052 if (G.cwd == bb_msg_unknown)
2053 G.cwd = NULL;
2054 G.cwd = xrealloc_getcwd_or_warn((char *)G.cwd);
2055 if (!G.cwd)
2056 G.cwd = bb_msg_unknown;
2057 }
Denis Vlasenko87a86552008-07-29 19:43:10 +00002058 return G.cwd;
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00002059}
2060
Denis Vlasenko83506862007-11-23 13:11:42 +00002061
Denys Vlasenkocb6ff252009-05-04 00:14:30 +02002062/*
2063 * Shell and environment variable support
2064 */
Denys Vlasenko27c56f12010-09-07 09:56:34 +02002065static struct variable **get_ptr_to_local_var(const char *name, unsigned len)
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002066{
Denys Vlasenkocb6ff252009-05-04 00:14:30 +02002067 struct variable **pp;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002068 struct variable *cur;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002069
Denys Vlasenkocb6ff252009-05-04 00:14:30 +02002070 pp = &G.top_var;
2071 while ((cur = *pp) != NULL) {
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002072 if (strncmp(cur->varstr, name, len) == 0 && cur->varstr[len] == '=')
Denys Vlasenkocb6ff252009-05-04 00:14:30 +02002073 return pp;
2074 pp = &cur->next;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002075 }
2076 return NULL;
2077}
2078
Denys Vlasenko03dad222010-01-12 23:29:57 +01002079static const char* FAST_FUNC get_local_var_value(const char *name)
Denys Vlasenkocb6ff252009-05-04 00:14:30 +02002080{
Denys Vlasenko29082232010-07-16 13:52:32 +02002081 struct variable **vpp;
Denys Vlasenko27c56f12010-09-07 09:56:34 +02002082 unsigned len = strlen(name);
Denys Vlasenko29082232010-07-16 13:52:32 +02002083
2084 if (G.expanded_assignments) {
2085 char **cpp = G.expanded_assignments;
Denys Vlasenko29082232010-07-16 13:52:32 +02002086 while (*cpp) {
2087 char *cp = *cpp;
2088 if (strncmp(cp, name, len) == 0 && cp[len] == '=')
2089 return cp + len + 1;
2090 cpp++;
2091 }
2092 }
2093
Denys Vlasenko27c56f12010-09-07 09:56:34 +02002094 vpp = get_ptr_to_local_var(name, len);
Denys Vlasenko29082232010-07-16 13:52:32 +02002095 if (vpp)
Denys Vlasenko27c56f12010-09-07 09:56:34 +02002096 return (*vpp)->varstr + len + 1;
Denys Vlasenko29082232010-07-16 13:52:32 +02002097
Denys Vlasenkodea47882009-10-09 15:40:49 +02002098 if (strcmp(name, "PPID") == 0)
2099 return utoa(G.root_ppid);
2100 // bash compat: UID? EUID?
Denys Vlasenko20b3d142009-10-09 20:59:39 +02002101#if ENABLE_HUSH_RANDOM_SUPPORT
Denys Vlasenko27c56f12010-09-07 09:56:34 +02002102 if (strcmp(name, "RANDOM") == 0)
Denys Vlasenko20b3d142009-10-09 20:59:39 +02002103 return utoa(next_random(&G.random_gen));
2104#endif
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002105 return NULL;
2106}
2107
2108/* str holds "NAME=VAL" and is expected to be malloced.
Mike Frysinger6379bb42009-03-28 18:55:03 +00002109 * We take ownership of it.
Mike Frysinger6379bb42009-03-28 18:55:03 +00002110 */
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02002111#define SETFLAG_EXPORT (1 << 0)
2112#define SETFLAG_UNEXPORT (1 << 1)
2113#define SETFLAG_MAKE_RO (1 << 2)
2114#define SETFLAG_LOCAL_SHIFT 3
2115static int set_local_var(char *str, unsigned flags)
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002116{
Denys Vlasenko295fef82009-06-03 12:47:26 +02002117 struct variable **var_pp;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002118 struct variable *cur;
Denys Vlasenkoa7693902016-10-03 15:01:06 +02002119 char *free_me = NULL;
Denis Vlasenko950bd722009-04-21 11:23:56 +00002120 char *eq_sign;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002121 int name_len;
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02002122 IF_HUSH_LOCAL(unsigned local_lvl = (flags >> SETFLAG_LOCAL_SHIFT);)
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002123
Denis Vlasenko950bd722009-04-21 11:23:56 +00002124 eq_sign = strchr(str, '=');
2125 if (!eq_sign) { /* not expected to ever happen? */
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002126 free(str);
2127 return -1;
2128 }
2129
Denis Vlasenko950bd722009-04-21 11:23:56 +00002130 name_len = eq_sign - str + 1; /* including '=' */
Denys Vlasenko295fef82009-06-03 12:47:26 +02002131 var_pp = &G.top_var;
2132 while ((cur = *var_pp) != NULL) {
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002133 if (strncmp(cur->varstr, str, name_len) != 0) {
Denys Vlasenko295fef82009-06-03 12:47:26 +02002134 var_pp = &cur->next;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002135 continue;
2136 }
Denys Vlasenkoa7693902016-10-03 15:01:06 +02002137
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002138 /* We found an existing var with this name */
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002139 if (cur->flg_read_only) {
Denys Vlasenko6b48e1f2017-07-17 21:31:17 +02002140 bb_error_msg("%s: readonly variable", str);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002141 free(str);
Denys Vlasenko5b2cc0a2017-07-18 02:44:06 +02002142//NOTE: in bash, assignment in "export READONLY_VAR=Z" fails, and sets $?=1,
2143//but export per se succeeds (does put the var in env). We don't mimic that.
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002144 return -1;
2145 }
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02002146 if (flags & SETFLAG_UNEXPORT) { // && cur->flg_export ?
Denis Vlasenko950bd722009-04-21 11:23:56 +00002147 debug_printf_env("%s: unsetenv '%s'\n", __func__, str);
2148 *eq_sign = '\0';
2149 unsetenv(str);
2150 *eq_sign = '=';
2151 }
Denys Vlasenko295fef82009-06-03 12:47:26 +02002152#if ENABLE_HUSH_LOCAL
2153 if (cur->func_nest_level < local_lvl) {
2154 /* New variable is declared as local,
2155 * and existing one is global, or local
2156 * from enclosing function.
2157 * Remove and save old one: */
2158 *var_pp = cur->next;
2159 cur->next = *G.shadowed_vars_pp;
2160 *G.shadowed_vars_pp = cur;
2161 /* bash 3.2.33(1) and exported vars:
2162 * # export z=z
2163 * # f() { local z=a; env | grep ^z; }
2164 * # f
2165 * z=a
2166 * # env | grep ^z
2167 * z=z
2168 */
2169 if (cur->flg_export)
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02002170 flags |= SETFLAG_EXPORT;
Denys Vlasenko295fef82009-06-03 12:47:26 +02002171 break;
2172 }
2173#endif
Denis Vlasenko950bd722009-04-21 11:23:56 +00002174 if (strcmp(cur->varstr + name_len, eq_sign + 1) == 0) {
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002175 free_and_exp:
2176 free(str);
2177 goto exp;
2178 }
Denys Vlasenko295fef82009-06-03 12:47:26 +02002179 if (cur->max_len != 0) {
2180 if (cur->max_len >= strlen(str)) {
2181 /* This one is from startup env, reuse space */
2182 strcpy(cur->varstr, str);
2183 goto free_and_exp;
2184 }
Denys Vlasenkoa7693902016-10-03 15:01:06 +02002185 /* Can't reuse */
2186 cur->max_len = 0;
2187 goto set_str_and_exp;
Denys Vlasenko295fef82009-06-03 12:47:26 +02002188 }
Denys Vlasenkoa7693902016-10-03 15:01:06 +02002189 /* max_len == 0 signifies "malloced" var, which we can
2190 * (and have to) free. But we can't free(cur->varstr) here:
2191 * if cur->flg_export is 1, it is in the environment.
2192 * We should either unsetenv+free, or wait until putenv,
2193 * then putenv(new)+free(old).
2194 */
2195 free_me = cur->varstr;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002196 goto set_str_and_exp;
2197 }
2198
Denys Vlasenko295fef82009-06-03 12:47:26 +02002199 /* Not found - create new variable struct */
2200 cur = xzalloc(sizeof(*cur));
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02002201 IF_HUSH_LOCAL(cur->func_nest_level = local_lvl;)
Denys Vlasenko295fef82009-06-03 12:47:26 +02002202 cur->next = *var_pp;
2203 *var_pp = cur;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002204
2205 set_str_and_exp:
2206 cur->varstr = str;
2207 exp:
Denys Vlasenko1e660422017-07-17 21:10:50 +02002208#if !BB_MMU || ENABLE_HUSH_READONLY
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02002209 if (flags & SETFLAG_MAKE_RO) {
2210 cur->flg_read_only = 1;
Denys Vlasenko1e660422017-07-17 21:10:50 +02002211 }
2212#endif
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02002213 if (flags & SETFLAG_EXPORT)
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002214 cur->flg_export = 1;
Mike Frysinger67c1c7b2009-04-24 06:26:18 +00002215 if (name_len == 4 && cur->varstr[0] == 'P' && cur->varstr[1] == 'S')
2216 cmdedit_update_prompt();
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002217 if (cur->flg_export) {
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02002218 if (flags & SETFLAG_UNEXPORT) {
Denis Vlasenkoad4bd052009-04-20 22:04:21 +00002219 cur->flg_export = 0;
2220 /* unsetenv was already done */
2221 } else {
Denys Vlasenkoa7693902016-10-03 15:01:06 +02002222 int i;
Denis Vlasenkoad4bd052009-04-20 22:04:21 +00002223 debug_printf_env("%s: putenv '%s'\n", __func__, cur->varstr);
Denys Vlasenkoa7693902016-10-03 15:01:06 +02002224 i = putenv(cur->varstr);
2225 /* only now we can free old exported malloced string */
2226 free(free_me);
2227 return i;
Denis Vlasenkoad4bd052009-04-20 22:04:21 +00002228 }
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002229 }
Denys Vlasenkoa7693902016-10-03 15:01:06 +02002230 free(free_me);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002231 return 0;
2232}
2233
Denys Vlasenko6db47842009-09-05 20:15:17 +02002234/* Used at startup and after each cd */
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02002235static void set_pwd_var(unsigned flag)
Denys Vlasenko6db47842009-09-05 20:15:17 +02002236{
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02002237 set_local_var(xasprintf("PWD=%s", get_cwd(/*force:*/ 1)), flag);
Denys Vlasenko6db47842009-09-05 20:15:17 +02002238}
2239
Denys Vlasenkoacdc49c2009-05-04 01:58:10 +02002240static int unset_local_var_len(const char *name, int name_len)
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002241{
2242 struct variable *cur;
Denys Vlasenkoacdc49c2009-05-04 01:58:10 +02002243 struct variable **var_pp;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002244
2245 if (!name)
Mike Frysingerd690f682009-03-30 06:50:54 +00002246 return EXIT_SUCCESS;
Denys Vlasenkoacdc49c2009-05-04 01:58:10 +02002247 var_pp = &G.top_var;
2248 while ((cur = *var_pp) != NULL) {
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002249 if (strncmp(cur->varstr, name, name_len) == 0 && cur->varstr[name_len] == '=') {
2250 if (cur->flg_read_only) {
2251 bb_error_msg("%s: readonly variable", name);
Mike Frysingerd690f682009-03-30 06:50:54 +00002252 return EXIT_FAILURE;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002253 }
Denys Vlasenkoacdc49c2009-05-04 01:58:10 +02002254 *var_pp = cur->next;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002255 debug_printf_env("%s: unsetenv '%s'\n", __func__, cur->varstr);
2256 bb_unsetenv(cur->varstr);
Mike Frysinger67c1c7b2009-04-24 06:26:18 +00002257 if (name_len == 3 && cur->varstr[0] == 'P' && cur->varstr[1] == 'S')
2258 cmdedit_update_prompt();
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002259 if (!cur->max_len)
2260 free(cur->varstr);
2261 free(cur);
Mike Frysingerd690f682009-03-30 06:50:54 +00002262 return EXIT_SUCCESS;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002263 }
Denys Vlasenkoacdc49c2009-05-04 01:58:10 +02002264 var_pp = &cur->next;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002265 }
Mike Frysingerd690f682009-03-30 06:50:54 +00002266 return EXIT_SUCCESS;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002267}
2268
Denys Vlasenko10d5ece2017-01-08 18:28:43 +01002269#if ENABLE_HUSH_UNSET
Denys Vlasenkoacdc49c2009-05-04 01:58:10 +02002270static int unset_local_var(const char *name)
2271{
2272 return unset_local_var_len(name, strlen(name));
2273}
Denys Vlasenko10d5ece2017-01-08 18:28:43 +01002274#endif
Denys Vlasenkoacdc49c2009-05-04 01:58:10 +02002275
2276static void unset_vars(char **strings)
2277{
2278 char **v;
2279
2280 if (!strings)
2281 return;
2282 v = strings;
2283 while (*v) {
2284 const char *eq = strchrnul(*v, '=');
2285 unset_local_var_len(*v, (int)(eq - *v));
2286 v++;
2287 }
2288 free(strings);
2289}
2290
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01002291#if BASH_HOSTNAME_VAR || ENABLE_FEATURE_SH_MATH || ENABLE_HUSH_READ
Denys Vlasenko03dad222010-01-12 23:29:57 +01002292static void FAST_FUNC set_local_var_from_halves(const char *name, const char *val)
Mike Frysinger98c52642009-04-02 10:02:37 +00002293{
Denis Vlasenkob29eb6e2009-04-02 13:46:27 +00002294 char *var = xasprintf("%s=%s", name, val);
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02002295 set_local_var(var, /*flag:*/ 0);
Mike Frysinger98c52642009-04-02 10:02:37 +00002296}
Denys Vlasenkocc2fd5a2017-01-09 06:19:55 +01002297#endif
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002298
Denis Vlasenkob29eb6e2009-04-02 13:46:27 +00002299
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002300/*
Denys Vlasenkocb6ff252009-05-04 00:14:30 +02002301 * Helpers for "var1=val1 var2=val2 cmd" feature
2302 */
2303static void add_vars(struct variable *var)
2304{
2305 struct variable *next;
2306
2307 while (var) {
2308 next = var->next;
2309 var->next = G.top_var;
2310 G.top_var = var;
Denys Vlasenkoacdc49c2009-05-04 01:58:10 +02002311 if (var->flg_export) {
2312 debug_printf_env("%s: restoring exported '%s'\n", __func__, var->varstr);
Denys Vlasenkocb6ff252009-05-04 00:14:30 +02002313 putenv(var->varstr);
Denys Vlasenkoacdc49c2009-05-04 01:58:10 +02002314 } else {
Denys Vlasenko295fef82009-06-03 12:47:26 +02002315 debug_printf_env("%s: restoring variable '%s'\n", __func__, var->varstr);
Denys Vlasenkoacdc49c2009-05-04 01:58:10 +02002316 }
Denys Vlasenkocb6ff252009-05-04 00:14:30 +02002317 var = next;
2318 }
2319}
2320
Denys Vlasenkoacdc49c2009-05-04 01:58:10 +02002321static struct variable *set_vars_and_save_old(char **strings)
Denys Vlasenkocb6ff252009-05-04 00:14:30 +02002322{
2323 char **s;
2324 struct variable *old = NULL;
2325
2326 if (!strings)
2327 return old;
2328 s = strings;
2329 while (*s) {
2330 struct variable *var_p;
2331 struct variable **var_pp;
2332 char *eq;
2333
2334 eq = strchr(*s, '=');
2335 if (eq) {
Denys Vlasenko27c56f12010-09-07 09:56:34 +02002336 var_pp = get_ptr_to_local_var(*s, eq - *s);
Denys Vlasenkocb6ff252009-05-04 00:14:30 +02002337 if (var_pp) {
Denys Vlasenkocb6ff252009-05-04 00:14:30 +02002338 var_p = *var_pp;
Denys Vlasenko5b2cc0a2017-07-18 02:44:06 +02002339 if (var_p->flg_read_only) {
Denys Vlasenkocf511092017-07-18 15:58:02 +02002340 char **p;
Denys Vlasenko5b2cc0a2017-07-18 02:44:06 +02002341 bb_error_msg("%s: readonly variable", *s);
Denys Vlasenkocf511092017-07-18 15:58:02 +02002342 /*
2343 * "VAR=V BLTIN" unsets VARs after BLTIN completes.
2344 * If VAR is readonly, leaving it in the list
2345 * after asssignment error (msg above)
2346 * causes doubled error message later, on unset.
2347 */
2348 debug_printf_env("removing/freeing '%s' element\n", *s);
2349 free(*s);
2350 p = s;
2351 do { *p = p[1]; p++; } while (*p);
Denys Vlasenko5b2cc0a2017-07-18 02:44:06 +02002352 goto next;
2353 }
2354 /* Remove variable from global linked list */
Denys Vlasenkoacdc49c2009-05-04 01:58:10 +02002355 debug_printf_env("%s: removing '%s'\n", __func__, var_p->varstr);
Denys Vlasenkocb6ff252009-05-04 00:14:30 +02002356 *var_pp = var_p->next;
2357 /* Add it to returned list */
2358 var_p->next = old;
2359 old = var_p;
2360 }
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02002361 set_local_var(*s, SETFLAG_EXPORT);
Denys Vlasenkocb6ff252009-05-04 00:14:30 +02002362 }
Denys Vlasenko5b2cc0a2017-07-18 02:44:06 +02002363 next:
Denys Vlasenkocb6ff252009-05-04 00:14:30 +02002364 s++;
2365 }
2366 return old;
2367}
2368
2369
2370/*
Denys Vlasenkoc538d5b2014-08-13 09:57:44 +02002371 * Unicode helper
2372 */
2373static void reinit_unicode_for_hush(void)
2374{
2375 /* Unicode support should be activated even if LANG is set
2376 * _during_ shell execution, not only if it was set when
2377 * shell was started. Therefore, re-check LANG every time:
2378 */
Denys Vlasenko841f8332014-08-13 10:09:49 +02002379 if (ENABLE_FEATURE_CHECK_UNICODE_IN_ENV
2380 || ENABLE_UNICODE_USING_LOCALE
2381 ) {
2382 const char *s = get_local_var_value("LC_ALL");
2383 if (!s) s = get_local_var_value("LC_CTYPE");
2384 if (!s) s = get_local_var_value("LANG");
2385 reinit_unicode(s);
2386 }
Denys Vlasenkoc538d5b2014-08-13 09:57:44 +02002387}
2388
Denys Vlasenkoc538d5b2014-08-13 09:57:44 +02002389/*
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002390 * in_str support (strings, and "strings" read from files).
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002391 */
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002392
2393#if ENABLE_HUSH_INTERACTIVE
Denys Vlasenko4074d492016-09-30 01:49:53 +02002394/* To test correct lineedit/interactive behavior, type from command line:
2395 * echo $P\
2396 * \
2397 * AT\
2398 * H\
2399 * \
Denys Vlasenko10ad6222017-04-17 16:13:32 +02002400 * It exercises a lot of corner cases.
Denys Vlasenko4074d492016-09-30 01:49:53 +02002401 */
Mike Frysinger67c1c7b2009-04-24 06:26:18 +00002402static void cmdedit_update_prompt(void)
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002403{
Mike Frysingerec2c6552009-03-28 12:24:44 +00002404 if (ENABLE_FEATURE_EDITING_FANCY_PROMPT) {
Mike Frysinger67c1c7b2009-04-24 06:26:18 +00002405 G.PS1 = get_local_var_value("PS1");
Mike Frysingerec2c6552009-03-28 12:24:44 +00002406 if (G.PS1 == NULL)
2407 G.PS1 = "\\w \\$ ";
Mike Frysinger67c1c7b2009-04-24 06:26:18 +00002408 G.PS2 = get_local_var_value("PS2");
Denys Vlasenko690ad242009-04-30 21:24:24 +02002409 } else {
Mike Frysingerec2c6552009-03-28 12:24:44 +00002410 G.PS1 = NULL;
Denys Vlasenko690ad242009-04-30 21:24:24 +02002411 }
Mike Frysinger67c1c7b2009-04-24 06:26:18 +00002412 if (G.PS2 == NULL)
2413 G.PS2 = "> ";
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002414}
Denys Vlasenkoda463fb2010-09-07 09:53:50 +02002415static const char *setup_prompt_string(int promptmode)
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002416{
2417 const char *prompt_str;
2418 debug_printf("setup_prompt_string %d ", promptmode);
Mike Frysingerec2c6552009-03-28 12:24:44 +00002419 if (!ENABLE_FEATURE_EDITING_FANCY_PROMPT) {
2420 /* Set up the prompt */
2421 if (promptmode == 0) { /* PS1 */
2422 free((char*)G.PS1);
Denys Vlasenko6db47842009-09-05 20:15:17 +02002423 /* bash uses $PWD value, even if it is set by user.
2424 * It uses current dir only if PWD is unset.
2425 * We always use current dir. */
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02002426 G.PS1 = xasprintf("%s %c ", get_cwd(0), (geteuid() != 0) ? '$' : '#');
Mike Frysingerec2c6552009-03-28 12:24:44 +00002427 prompt_str = G.PS1;
2428 } else
2429 prompt_str = G.PS2;
2430 } else
2431 prompt_str = (promptmode == 0) ? G.PS1 : G.PS2;
Denys Vlasenko4074d492016-09-30 01:49:53 +02002432 debug_printf("prompt_str '%s'\n", prompt_str);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002433 return prompt_str;
2434}
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002435static int get_user_input(struct in_str *i)
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002436{
2437 int r;
2438 const char *prompt_str;
2439
2440 prompt_str = setup_prompt_string(i->promptmode);
Denys Vlasenko8391c482010-05-22 17:50:43 +02002441# if ENABLE_FEATURE_EDITING
Denys Vlasenko8660aeb2016-11-24 17:44:02 +01002442 for (;;) {
Denys Vlasenkoc538d5b2014-08-13 09:57:44 +02002443 reinit_unicode_for_hush();
Denys Vlasenko4b89d512016-11-25 03:41:03 +01002444 if (G.flag_SIGINT) {
2445 /* There was ^C'ed, make it look prettier: */
2446 bb_putchar('\n');
2447 G.flag_SIGINT = 0;
2448 }
Denis Vlasenko422cd7c2009-03-31 12:41:52 +00002449 /* buglet: SIGINT will not make new prompt to appear _at once_,
Denys Vlasenko4b89d512016-11-25 03:41:03 +01002450 * only after <Enter>. (^C works immediately) */
Denys Vlasenko0448c552016-09-29 20:25:44 +02002451 r = read_line_input(G.line_input_state, prompt_str,
Denys Vlasenko84ea60e2017-08-02 17:27:28 +02002452 G.user_input_buf, CONFIG_FEATURE_EDITING_MAX_LEN-1
Denys Vlasenko0448c552016-09-29 20:25:44 +02002453 );
Denys Vlasenko4b89d512016-11-25 03:41:03 +01002454 /* read_line_input intercepts ^C, "convert" it to SIGINT */
Denys Vlasenkodd4b4462017-08-02 16:52:12 +02002455 if (r == 0)
Denys Vlasenko8660aeb2016-11-24 17:44:02 +01002456 raise(SIGINT);
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02002457 check_and_run_traps();
Denys Vlasenko8660aeb2016-11-24 17:44:02 +01002458 if (r != 0 && !G.flag_SIGINT)
2459 break;
2460 /* ^C or SIGINT: repeat */
Denys Vlasenkodd4b4462017-08-02 16:52:12 +02002461 /* bash prints ^C even on real SIGINT (non-kbd generated) */
2462 write(STDOUT_FILENO, "^C", 2);
Denys Vlasenko8660aeb2016-11-24 17:44:02 +01002463 G.last_exitcode = 128 + SIGINT;
2464 }
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002465 if (r < 0) {
2466 /* EOF/error detected */
Denys Vlasenko4074d492016-09-30 01:49:53 +02002467 i->p = NULL;
2468 i->peek_buf[0] = r = EOF;
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002469 return r;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002470 }
Denys Vlasenko4074d492016-09-30 01:49:53 +02002471 i->p = G.user_input_buf;
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002472 return (unsigned char)*i->p++;
Denys Vlasenko8391c482010-05-22 17:50:43 +02002473# else
Denys Vlasenko8660aeb2016-11-24 17:44:02 +01002474 for (;;) {
Denis Vlasenko422cd7c2009-03-31 12:41:52 +00002475 G.flag_SIGINT = 0;
Denys Vlasenkob8709032011-05-08 21:20:01 +02002476 if (i->last_char == '\0' || i->last_char == '\n') {
2477 /* Why check_and_run_traps here? Try this interactively:
2478 * $ trap 'echo INT' INT; (sleep 2; kill -INT $$) &
2479 * $ <[enter], repeatedly...>
2480 * Without check_and_run_traps, handler never runs.
2481 */
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02002482 check_and_run_traps();
Denys Vlasenkob8709032011-05-08 21:20:01 +02002483 fputs(prompt_str, stdout);
2484 }
Denys Vlasenko8131eea2009-11-02 14:19:51 +01002485 fflush_all();
Denys Vlasenko4b89d512016-11-25 03:41:03 +01002486//FIXME: here ^C or SIGINT will have effect only after <Enter>
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002487 r = fgetc(i->file);
Denys Vlasenko8660aeb2016-11-24 17:44:02 +01002488 /* In !ENABLE_FEATURE_EDITING we don't use read_line_input,
2489 * no ^C masking happens during fgetc, no special code for ^C:
2490 * it generates SIGINT as usual.
2491 */
2492 check_and_run_traps();
2493 if (G.flag_SIGINT)
2494 G.last_exitcode = 128 + SIGINT;
2495 if (r != '\0')
2496 break;
2497 }
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002498 return r;
Denys Vlasenko8391c482010-05-22 17:50:43 +02002499# endif
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002500}
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002501/* This is the magic location that prints prompts
2502 * and gets data back from the user */
Denys Vlasenko4074d492016-09-30 01:49:53 +02002503static int fgetc_interactive(struct in_str *i)
2504{
2505 int ch;
2506 /* If it's interactive stdin, get new line. */
2507 if (G_interactive_fd && i->file == stdin) {
2508 /* Returns first char (or EOF), the rest is in i->p[] */
2509 ch = get_user_input(i);
2510 i->promptmode = 1; /* PS2 */
2511 } else {
2512 /* Not stdin: script file, sourced file, etc */
2513 do ch = fgetc(i->file); while (ch == '\0');
2514 }
2515 return ch;
2516}
2517#else
2518static inline int fgetc_interactive(struct in_str *i)
2519{
2520 int ch;
2521 do ch = fgetc(i->file); while (ch == '\0');
2522 return ch;
2523}
2524#endif /* INTERACTIVE */
2525
Denys Vlasenko87e039d2016-11-08 22:35:05 +01002526static int i_getch(struct in_str *i)
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002527{
2528 int ch;
2529
Denys Vlasenko87e039d2016-11-08 22:35:05 +01002530 if (!i->file) {
2531 /* string-based in_str */
2532 ch = (unsigned char)*i->p;
2533 if (ch != '\0') {
2534 i->p++;
2535 i->last_char = ch;
2536 return ch;
2537 }
2538 return EOF;
2539 }
2540
2541 /* FILE-based in_str */
2542
Denys Vlasenko4074d492016-09-30 01:49:53 +02002543#if ENABLE_FEATURE_EDITING
2544 /* This can be stdin, check line editing char[] buffer */
2545 if (i->p && *i->p != '\0') {
2546 ch = (unsigned char)*i->p++;
2547 goto out;
2548 }
2549#endif
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002550 /* peek_buf[] is an int array, not char. Can contain EOF. */
2551 ch = i->peek_buf[0];
Denys Vlasenko4074d492016-09-30 01:49:53 +02002552 if (ch != 0) {
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002553 int ch2 = i->peek_buf[1];
2554 i->peek_buf[0] = ch2;
2555 if (ch2 == 0) /* very likely, avoid redundant write */
2556 goto out;
2557 i->peek_buf[1] = 0;
2558 goto out;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002559 }
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002560
Denys Vlasenko4074d492016-09-30 01:49:53 +02002561 ch = fgetc_interactive(i);
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002562 out:
Denis Vlasenko913a2012009-04-05 22:17:04 +00002563 debug_printf("file_get: got '%c' %d\n", ch, ch);
Denys Vlasenkocecbc982011-03-30 18:54:52 +02002564 i->last_char = ch;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002565 return ch;
2566}
2567
Denys Vlasenko87e039d2016-11-08 22:35:05 +01002568static int i_peek(struct in_str *i)
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002569{
2570 int ch;
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002571
Denys Vlasenko87e039d2016-11-08 22:35:05 +01002572 if (!i->file) {
2573 /* string-based in_str */
2574 /* Doesn't report EOF on NUL. None of the callers care. */
2575 return (unsigned char)*i->p;
2576 }
2577
2578 /* FILE-based in_str */
2579
Denys Vlasenko4074d492016-09-30 01:49:53 +02002580#if ENABLE_FEATURE_EDITING && ENABLE_HUSH_INTERACTIVE
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002581 /* This can be stdin, check line editing char[] buffer */
2582 if (i->p && *i->p != '\0')
2583 return (unsigned char)*i->p;
2584#endif
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002585 /* peek_buf[] is an int array, not char. Can contain EOF. */
2586 ch = i->peek_buf[0];
Denys Vlasenko4074d492016-09-30 01:49:53 +02002587 if (ch != 0)
2588 return ch;
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002589
Denys Vlasenko4074d492016-09-30 01:49:53 +02002590 /* Need to get a new char */
2591 ch = fgetc_interactive(i);
2592 debug_printf("file_peek: got '%c' %d\n", ch, ch);
2593
2594 /* Save it by either rolling back line editing buffer, or in i->peek_buf[0] */
2595#if ENABLE_FEATURE_EDITING && ENABLE_HUSH_INTERACTIVE
2596 if (i->p) {
2597 i->p -= 1;
2598 return ch;
2599 }
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002600#endif
Denys Vlasenko4074d492016-09-30 01:49:53 +02002601 i->peek_buf[0] = ch;
2602 /*i->peek_buf[1] = 0; - already is */
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002603 return ch;
2604}
2605
Denys Vlasenko4074d492016-09-30 01:49:53 +02002606/* Only ever called if i_peek() was called, and did not return EOF.
2607 * IOW: we know the previous peek saw an ordinary char, not EOF, not NUL,
2608 * not end-of-line. Therefore we never need to read a new editing line here.
2609 */
2610static int i_peek2(struct in_str *i)
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002611{
Denys Vlasenko4074d492016-09-30 01:49:53 +02002612 int ch;
2613
2614 /* There are two cases when i->p[] buffer exists.
2615 * (1) it's a string in_str.
Denys Vlasenko08755f92016-09-30 02:02:25 +02002616 * (2) It's a file, and we have a saved line editing buffer.
Denys Vlasenko4074d492016-09-30 01:49:53 +02002617 * In both cases, we know that i->p[0] exists and not NUL, and
2618 * the peek2 result is in i->p[1].
2619 */
2620 if (i->p)
2621 return (unsigned char)i->p[1];
2622
2623 /* Now we know it is a file-based in_str. */
2624
2625 /* peek_buf[] is an int array, not char. Can contain EOF. */
2626 /* Is there 2nd char? */
2627 ch = i->peek_buf[1];
2628 if (ch == 0) {
2629 /* We did not read it yet, get it now */
2630 do ch = fgetc(i->file); while (ch == '\0');
2631 i->peek_buf[1] = ch;
2632 }
2633
2634 debug_printf("file_peek2: got '%c' %d\n", ch, ch);
2635 return ch;
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02002636}
2637
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002638static void setup_file_in_str(struct in_str *i, FILE *f)
2639{
Denys Vlasenkoa1463192011-01-18 17:55:04 +01002640 memset(i, 0, sizeof(*i));
Denys Vlasenkoa1463192011-01-18 17:55:04 +01002641 /* i->promptmode = 0; - PS1 (memset did it) */
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002642 i->file = f;
Denys Vlasenkoa1463192011-01-18 17:55:04 +01002643 /* i->p = NULL; */
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002644}
2645
2646static void setup_string_in_str(struct in_str *i, const char *s)
2647{
Denys Vlasenkoa1463192011-01-18 17:55:04 +01002648 memset(i, 0, sizeof(*i));
Denys Vlasenkoa1463192011-01-18 17:55:04 +01002649 /* i->promptmode = 0; - PS1 (memset did it) */
Denys Vlasenko87e039d2016-11-08 22:35:05 +01002650 /*i->file = NULL */;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002651 i->p = s;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002652}
2653
2654
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00002655/*
2656 * o_string support
2657 */
2658#define B_CHUNK (32 * sizeof(char*))
Eric Andersen25f27032001-04-26 23:22:31 +00002659
Denis Vlasenko0b677d82009-04-10 13:49:10 +00002660static void o_reset_to_empty_unquoted(o_string *o)
Eric Andersen25f27032001-04-26 23:22:31 +00002661{
2662 o->length = 0;
Denys Vlasenko38292b62010-09-05 14:49:40 +02002663 o->has_quoted_part = 0;
Denis Vlasenkod65ea392007-10-01 10:02:25 +00002664 if (o->data)
2665 o->data[0] = '\0';
Eric Andersen25f27032001-04-26 23:22:31 +00002666}
2667
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00002668static void o_free(o_string *o)
Eric Andersen25f27032001-04-26 23:22:31 +00002669{
Aaron Lehmanna170e1c2002-11-28 11:27:31 +00002670 free(o->data);
Denis Vlasenkod65ea392007-10-01 10:02:25 +00002671 memset(o, 0, sizeof(*o));
Eric Andersen25f27032001-04-26 23:22:31 +00002672}
2673
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00002674static ALWAYS_INLINE void o_free_unsafe(o_string *o)
2675{
2676 free(o->data);
2677}
2678
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00002679static void o_grow_by(o_string *o, int len)
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00002680{
2681 if (o->length + len > o->maxlen) {
Denys Vlasenko46e64982016-09-29 19:50:55 +02002682 o->maxlen += (2 * len) | (B_CHUNK-1);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00002683 o->data = xrealloc(o->data, 1 + o->maxlen);
2684 }
2685}
2686
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00002687static void o_addchr(o_string *o, int ch)
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00002688{
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00002689 debug_printf("o_addchr: '%c' o->length=%d o=%p\n", ch, o->length, o);
Denys Vlasenko46e64982016-09-29 19:50:55 +02002690 if (o->length < o->maxlen) {
2691 /* likely. avoid o_grow_by() call */
2692 add:
2693 o->data[o->length] = ch;
2694 o->length++;
2695 o->data[o->length] = '\0';
2696 return;
2697 }
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00002698 o_grow_by(o, 1);
Denys Vlasenko46e64982016-09-29 19:50:55 +02002699 goto add;
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00002700}
2701
Denys Vlasenko657086a2016-09-29 18:07:42 +02002702#if 0
2703/* Valid only if we know o_string is not empty */
2704static void o_delchr(o_string *o)
2705{
2706 o->length--;
2707 o->data[o->length] = '\0';
2708}
2709#endif
2710
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00002711static void o_addblock(o_string *o, const char *str, int len)
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00002712{
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00002713 o_grow_by(o, len);
Denys Vlasenko0675b032017-07-24 02:17:05 +02002714 ((char*)mempcpy(&o->data[o->length], str, len))[0] = '\0';
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00002715 o->length += len;
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00002716}
2717
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00002718static void o_addstr(o_string *o, const char *str)
Mike Frysinger98c52642009-04-02 10:02:37 +00002719{
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00002720 o_addblock(o, str, strlen(str));
2721}
Denys Vlasenko2e48d532010-05-22 17:30:39 +02002722
Denys Vlasenko1e811b12010-05-22 03:12:29 +02002723#if !BB_MMU
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00002724static void nommu_addchr(o_string *o, int ch)
2725{
2726 if (o)
2727 o_addchr(o, ch);
2728}
2729#else
Denys Vlasenko28a105d2009-06-01 11:26:30 +02002730# define nommu_addchr(o, str) ((void)0)
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00002731#endif
2732
2733static void o_addstr_with_NUL(o_string *o, const char *str)
2734{
2735 o_addblock(o, str, strlen(str) + 1);
Mike Frysinger98c52642009-04-02 10:02:37 +00002736}
2737
Denys Vlasenkof3e28182009-11-17 03:35:31 +01002738/*
Denys Vlasenko238081f2010-10-03 14:26:26 +02002739 * HUSH_BRACE_EXPANSION code needs corresponding quoting on variable expansion side.
Denys Vlasenkof3e28182009-11-17 03:35:31 +01002740 * Currently, "v='{q,w}'; echo $v" erroneously expands braces in $v.
2741 * Apparently, on unquoted $v bash still does globbing
2742 * ("v='*.txt'; echo $v" prints all .txt files),
2743 * but NOT brace expansion! Thus, there should be TWO independent
2744 * quoting mechanisms on $v expansion side: one protects
2745 * $v from brace expansion, and other additionally protects "$v" against globbing.
2746 * We have only second one.
2747 */
2748
Denys Vlasenko9e800222010-10-03 14:28:04 +02002749#if ENABLE_HUSH_BRACE_EXPANSION
Denys Vlasenkof3e28182009-11-17 03:35:31 +01002750# define MAYBE_BRACES "{}"
2751#else
2752# define MAYBE_BRACES ""
2753#endif
2754
Eric Andersen25f27032001-04-26 23:22:31 +00002755/* My analysis of quoting semantics tells me that state information
2756 * is associated with a destination, not a source.
2757 */
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00002758static void o_addqchr(o_string *o, int ch)
Eric Andersen25f27032001-04-26 23:22:31 +00002759{
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00002760 int sz = 1;
Denys Vlasenkof3e28182009-11-17 03:35:31 +01002761 char *found = strchr("*?[\\" MAYBE_BRACES, ch);
Denis Vlasenko371de4a2008-10-14 12:43:13 +00002762 if (found)
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00002763 sz++;
Denis Vlasenko371de4a2008-10-14 12:43:13 +00002764 o_grow_by(o, sz);
2765 if (found) {
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00002766 o->data[o->length] = '\\';
2767 o->length++;
Eric Andersen25f27032001-04-26 23:22:31 +00002768 }
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00002769 o->data[o->length] = ch;
2770 o->length++;
2771 o->data[o->length] = '\0';
Eric Andersen25f27032001-04-26 23:22:31 +00002772}
2773
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00002774static void o_addQchr(o_string *o, int ch)
Denis Vlasenko87f40ba2008-06-10 22:39:37 +00002775{
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00002776 int sz = 1;
Denys Vlasenko5b686cb2010-09-08 13:44:34 +02002777 if ((o->o_expflags & EXP_FLAG_ESC_GLOB_CHARS)
2778 && strchr("*?[\\" MAYBE_BRACES, ch)
2779 ) {
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00002780 sz++;
2781 o->data[o->length] = '\\';
2782 o->length++;
2783 }
2784 o_grow_by(o, sz);
2785 o->data[o->length] = ch;
2786 o->length++;
2787 o->data[o->length] = '\0';
2788}
2789
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02002790static void o_addqblock(o_string *o, const char *str, int len)
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00002791{
Denis Vlasenko87f40ba2008-06-10 22:39:37 +00002792 while (len) {
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00002793 char ch;
2794 int sz;
Denys Vlasenkof3e28182009-11-17 03:35:31 +01002795 int ordinary_cnt = strcspn(str, "*?[\\" MAYBE_BRACES);
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00002796 if (ordinary_cnt > len) /* paranoia */
2797 ordinary_cnt = len;
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00002798 o_addblock(o, str, ordinary_cnt);
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00002799 if (ordinary_cnt == len)
Denys Vlasenko4fb53fb2011-08-01 14:06:20 +02002800 return; /* NUL is already added by o_addblock */
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00002801 str += ordinary_cnt;
Denis Vlasenko30c9cc52008-06-17 07:24:29 +00002802 len -= ordinary_cnt + 1; /* we are processing + 1 char below */
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00002803
Denis Vlasenko87f40ba2008-06-10 22:39:37 +00002804 ch = *str++;
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00002805 sz = 1;
Denys Vlasenkof3e28182009-11-17 03:35:31 +01002806 if (ch) { /* it is necessarily one of "*?[\\" MAYBE_BRACES */
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00002807 sz++;
2808 o->data[o->length] = '\\';
2809 o->length++;
Denis Vlasenko87f40ba2008-06-10 22:39:37 +00002810 }
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00002811 o_grow_by(o, sz);
2812 o->data[o->length] = ch;
2813 o->length++;
Denis Vlasenko87f40ba2008-06-10 22:39:37 +00002814 }
Denys Vlasenko4fb53fb2011-08-01 14:06:20 +02002815 o->data[o->length] = '\0';
Denis Vlasenko87f40ba2008-06-10 22:39:37 +00002816}
2817
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02002818static void o_addQblock(o_string *o, const char *str, int len)
2819{
Denys Vlasenko5b686cb2010-09-08 13:44:34 +02002820 if (!(o->o_expflags & EXP_FLAG_ESC_GLOB_CHARS)) {
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02002821 o_addblock(o, str, len);
2822 return;
2823 }
2824 o_addqblock(o, str, len);
2825}
2826
Denys Vlasenko38292b62010-09-05 14:49:40 +02002827static void o_addQstr(o_string *o, const char *str)
2828{
2829 o_addQblock(o, str, strlen(str));
2830}
2831
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00002832/* A special kind of o_string for $VAR and `cmd` expansion.
2833 * It contains char* list[] at the beginning, which is grown in 16 element
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00002834 * increments. Actual string data starts at the next multiple of 16 * (char*).
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00002835 * list[i] contains an INDEX (int!) into this string data.
2836 * It means that if list[] needs to grow, data needs to be moved higher up
2837 * but list[i]'s need not be modified.
2838 * NB: remembering how many list[i]'s you have there is crucial.
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00002839 * o_finalize_list() operation post-processes this structure - calculates
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00002840 * and stores actual char* ptrs in list[]. Oh, it NULL terminates it as well.
2841 */
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00002842#if DEBUG_EXPAND || DEBUG_GLOB
2843static void debug_print_list(const char *prefix, o_string *o, int n)
2844{
2845 char **list = (char**)o->data;
2846 int string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]);
2847 int i = 0;
Denis Vlasenko0701dca2009-04-11 10:38:47 +00002848
2849 indent();
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01002850 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 +02002851 prefix, list, n, string_start, o->length, o->maxlen,
2852 !!(o->o_expflags & EXP_FLAG_GLOB),
2853 o->has_quoted_part,
2854 !!(o->o_expflags & EXP_FLAG_ESC_GLOB_CHARS));
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00002855 while (i < n) {
Denis Vlasenko0701dca2009-04-11 10:38:47 +00002856 indent();
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01002857 fdprintf(2, " list[%d]=%d '%s' %p\n", i, (int)(uintptr_t)list[i],
2858 o->data + (int)(uintptr_t)list[i] + string_start,
2859 o->data + (int)(uintptr_t)list[i] + string_start);
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00002860 i++;
2861 }
2862 if (n) {
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01002863 const char *p = o->data + (int)(uintptr_t)list[n - 1] + string_start;
Denis Vlasenko0701dca2009-04-11 10:38:47 +00002864 indent();
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01002865 fdprintf(2, " total_sz:%ld\n", (long)((p + strlen(p) + 1) - o->data));
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00002866 }
2867}
2868#else
Denys Vlasenko28a105d2009-06-01 11:26:30 +02002869# define debug_print_list(prefix, o, n) ((void)0)
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00002870#endif
2871
2872/* n = o_save_ptr_helper(str, n) "starts new string" by storing an index value
2873 * in list[n] so that it points past last stored byte so far.
2874 * It returns n+1. */
2875static int o_save_ptr_helper(o_string *o, int n)
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00002876{
2877 char **list = (char**)o->data;
Denis Vlasenko895bea22008-06-10 18:06:24 +00002878 int string_start;
2879 int string_len;
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00002880
2881 if (!o->has_empty_slot) {
Denis Vlasenko895bea22008-06-10 18:06:24 +00002882 string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]);
2883 string_len = o->length - string_start;
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00002884 if (!(n & 0xf)) { /* 0, 0x10, 0x20...? */
Denis Vlasenko30c9cc52008-06-17 07:24:29 +00002885 debug_printf_list("list[%d]=%d string_start=%d (growing)\n", n, string_len, string_start);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00002886 /* list[n] points to string_start, make space for 16 more pointers */
2887 o->maxlen += 0x10 * sizeof(list[0]);
2888 o->data = xrealloc(o->data, o->maxlen + 1);
Denis Vlasenko7049ff82008-06-25 09:53:17 +00002889 list = (char**)o->data;
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00002890 memmove(list + n + 0x10, list + n, string_len);
2891 o->length += 0x10 * sizeof(list[0]);
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00002892 } else {
2893 debug_printf_list("list[%d]=%d string_start=%d\n",
2894 n, string_len, string_start);
2895 }
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00002896 } else {
2897 /* We have empty slot at list[n], reuse without growth */
Denis Vlasenko895bea22008-06-10 18:06:24 +00002898 string_start = ((n+1 + 0xf) & ~0xf) * sizeof(list[0]); /* NB: n+1! */
2899 string_len = o->length - string_start;
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00002900 debug_printf_list("list[%d]=%d string_start=%d (empty slot)\n",
2901 n, string_len, string_start);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00002902 o->has_empty_slot = 0;
2903 }
Denys Vlasenko4fb53fb2011-08-01 14:06:20 +02002904 o->has_quoted_part = 0;
Denys Vlasenkoda463fb2010-09-07 09:53:50 +02002905 list[n] = (char*)(uintptr_t)string_len;
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00002906 return n + 1;
2907}
2908
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00002909/* "What was our last o_save_ptr'ed position (byte offset relative o->data)?" */
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00002910static int o_get_last_ptr(o_string *o, int n)
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00002911{
2912 char **list = (char**)o->data;
2913 int string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]);
2914
Denys Vlasenkoda463fb2010-09-07 09:53:50 +02002915 return ((int)(uintptr_t)list[n-1]) + string_start;
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00002916}
2917
Denys Vlasenko9e800222010-10-03 14:28:04 +02002918#if ENABLE_HUSH_BRACE_EXPANSION
Denys Vlasenko5b2db972009-11-16 05:49:36 +01002919/* There in a GNU extension, GLOB_BRACE, but it is not usable:
2920 * first, it processes even {a} (no commas), second,
2921 * I didn't manage to make it return strings when they don't match
Denys Vlasenko160746b2009-11-16 05:51:18 +01002922 * existing files. Need to re-implement it.
Denys Vlasenko5b2db972009-11-16 05:49:36 +01002923 */
Denys Vlasenkof3e28182009-11-17 03:35:31 +01002924
2925/* Helper */
2926static int glob_needed(const char *s)
2927{
2928 while (*s) {
2929 if (*s == '\\') {
2930 if (!s[1])
2931 return 0;
2932 s += 2;
2933 continue;
2934 }
2935 if (*s == '*' || *s == '[' || *s == '?' || *s == '{')
2936 return 1;
2937 s++;
2938 }
2939 return 0;
2940}
Denys Vlasenko5b2db972009-11-16 05:49:36 +01002941/* Return pointer to next closing brace or to comma */
2942static const char *next_brace_sub(const char *cp)
2943{
2944 unsigned depth = 0;
2945 cp++;
2946 while (*cp != '\0') {
2947 if (*cp == '\\') {
2948 if (*++cp == '\0')
2949 break;
2950 cp++;
2951 continue;
Denys Vlasenko3581c622010-01-25 13:39:24 +01002952 }
Denys Vlasenkoda463fb2010-09-07 09:53:50 +02002953 if ((*cp == '}' && depth-- == 0) || (*cp == ',' && depth == 0))
Denys Vlasenko5b2db972009-11-16 05:49:36 +01002954 break;
Denys Vlasenkoda463fb2010-09-07 09:53:50 +02002955 if (*cp++ == '{')
Denys Vlasenko5b2db972009-11-16 05:49:36 +01002956 depth++;
2957 }
2958
2959 return *cp != '\0' ? cp : NULL;
2960}
Denys Vlasenkof3e28182009-11-17 03:35:31 +01002961/* Recursive brace globber. Note: may garble pattern[]. */
2962static int glob_brace(char *pattern, o_string *o, int n)
Denys Vlasenko5b2db972009-11-16 05:49:36 +01002963{
Denys Vlasenkof3e28182009-11-17 03:35:31 +01002964 char *new_pattern_buf;
Denys Vlasenko5b2db972009-11-16 05:49:36 +01002965 const char *begin;
Denys Vlasenko5b2db972009-11-16 05:49:36 +01002966 const char *next;
2967 const char *rest;
Denys Vlasenkof3e28182009-11-17 03:35:31 +01002968 const char *p;
Denys Vlasenko5b2db972009-11-16 05:49:36 +01002969 size_t rest_len;
Denys Vlasenko5b2db972009-11-16 05:49:36 +01002970
2971 debug_printf_glob("glob_brace('%s')\n", pattern);
2972
2973 begin = pattern;
2974 while (1) {
2975 if (*begin == '\0')
Denys Vlasenkof3e28182009-11-17 03:35:31 +01002976 goto simple_glob;
Denys Vlasenkoda463fb2010-09-07 09:53:50 +02002977 if (*begin == '{') {
Denys Vlasenko5b2db972009-11-16 05:49:36 +01002978 /* Find the first sub-pattern and at the same time
2979 * find the rest after the closing brace */
2980 next = next_brace_sub(begin);
2981 if (next == NULL) {
2982 /* An illegal expression */
Denys Vlasenkof3e28182009-11-17 03:35:31 +01002983 goto simple_glob;
Denys Vlasenko5b2db972009-11-16 05:49:36 +01002984 }
Denys Vlasenkoda463fb2010-09-07 09:53:50 +02002985 if (*next == '}') {
Denys Vlasenko5b2db972009-11-16 05:49:36 +01002986 /* "{abc}" with no commas - illegal
2987 * brace expr, disregard and skip it */
2988 begin = next + 1;
2989 continue;
2990 }
2991 break;
2992 }
2993 if (*begin == '\\' && begin[1] != '\0')
2994 begin++;
2995 begin++;
2996 }
2997 debug_printf_glob("begin:%s\n", begin);
2998 debug_printf_glob("next:%s\n", next);
2999
3000 /* Now find the end of the whole brace expression */
3001 rest = next;
Denys Vlasenkoda463fb2010-09-07 09:53:50 +02003002 while (*rest != '}') {
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003003 rest = next_brace_sub(rest);
3004 if (rest == NULL) {
3005 /* An illegal expression */
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003006 goto simple_glob;
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003007 }
3008 debug_printf_glob("rest:%s\n", rest);
3009 }
3010 rest_len = strlen(++rest) + 1;
3011
3012 /* We are sure the brace expression is well-formed */
3013
3014 /* Allocate working buffer large enough for our work */
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003015 new_pattern_buf = xmalloc(strlen(pattern));
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003016
3017 /* We have a brace expression. BEGIN points to the opening {,
3018 * NEXT points past the terminator of the first element, and REST
3019 * points past the final }. We will accumulate result names from
3020 * recursive runs for each brace alternative in the buffer using
3021 * GLOB_APPEND. */
3022
3023 p = begin + 1;
3024 while (1) {
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003025 /* Construct the new glob expression */
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003026 memcpy(
3027 mempcpy(
3028 mempcpy(new_pattern_buf,
3029 /* We know the prefix for all sub-patterns */
3030 pattern, begin - pattern),
3031 p, next - p),
3032 rest, rest_len);
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003033
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003034 /* Note: glob_brace() may garble new_pattern_buf[].
3035 * That's why we re-copy prefix every time (1st memcpy above).
3036 */
3037 n = glob_brace(new_pattern_buf, o, n);
Denys Vlasenkoda463fb2010-09-07 09:53:50 +02003038 if (*next == '}') {
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003039 /* We saw the last entry */
3040 break;
3041 }
3042 p = next + 1;
3043 next = next_brace_sub(next);
3044 }
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003045 free(new_pattern_buf);
3046 return n;
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003047
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003048 simple_glob:
3049 {
3050 int gr;
3051 glob_t globdata;
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003052
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003053 memset(&globdata, 0, sizeof(globdata));
3054 gr = glob(pattern, 0, NULL, &globdata);
3055 debug_printf_glob("glob('%s'):%d\n", pattern, gr);
3056 if (gr != 0) {
3057 if (gr == GLOB_NOMATCH) {
3058 globfree(&globdata);
3059 /* NB: garbles parameter */
3060 unbackslash(pattern);
3061 o_addstr_with_NUL(o, pattern);
3062 debug_printf_glob("glob pattern '%s' is literal\n", pattern);
3063 return o_save_ptr_helper(o, n);
3064 }
3065 if (gr == GLOB_NOSPACE)
3066 bb_error_msg_and_die(bb_msg_memory_exhausted);
3067 /* GLOB_ABORTED? Only happens with GLOB_ERR flag,
3068 * but we didn't specify it. Paranoia again. */
3069 bb_error_msg_and_die("glob error %d on '%s'", gr, pattern);
3070 }
3071 if (globdata.gl_pathv && globdata.gl_pathv[0]) {
3072 char **argv = globdata.gl_pathv;
3073 while (1) {
3074 o_addstr_with_NUL(o, *argv);
3075 n = o_save_ptr_helper(o, n);
3076 argv++;
3077 if (!*argv)
3078 break;
3079 }
3080 }
3081 globfree(&globdata);
3082 }
3083 return n;
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003084}
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003085/* Performs globbing on last list[],
3086 * saving each result as a new list[].
3087 */
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02003088static int perform_glob(o_string *o, int n)
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003089{
3090 char *pattern, *copy;
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003091
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02003092 debug_printf_glob("start perform_glob: n:%d o->data:%p\n", n, o->data);
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003093 if (!o->data)
3094 return o_save_ptr_helper(o, n);
3095 pattern = o->data + o_get_last_ptr(o, n);
3096 debug_printf_glob("glob pattern '%s'\n", pattern);
3097 if (!glob_needed(pattern)) {
3098 /* unbackslash last string in o in place, fix length */
3099 o->length = unbackslash(pattern) - o->data;
3100 debug_printf_glob("glob pattern '%s' is literal\n", pattern);
3101 return o_save_ptr_helper(o, n);
3102 }
3103
3104 copy = xstrdup(pattern);
3105 /* "forget" pattern in o */
3106 o->length = pattern - o->data;
3107 n = glob_brace(copy, o, n);
3108 free(copy);
3109 if (DEBUG_GLOB)
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02003110 debug_print_list("perform_glob returning", o, n);
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003111 return n;
3112}
3113
Denys Vlasenko238081f2010-10-03 14:26:26 +02003114#else /* !HUSH_BRACE_EXPANSION */
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003115
3116/* Helper */
3117static int glob_needed(const char *s)
3118{
3119 while (*s) {
3120 if (*s == '\\') {
3121 if (!s[1])
3122 return 0;
3123 s += 2;
3124 continue;
3125 }
3126 if (*s == '*' || *s == '[' || *s == '?')
3127 return 1;
3128 s++;
3129 }
3130 return 0;
3131}
3132/* Performs globbing on last list[],
3133 * saving each result as a new list[].
3134 */
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02003135static int perform_glob(o_string *o, int n)
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00003136{
3137 glob_t globdata;
3138 int gr;
3139 char *pattern;
3140
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02003141 debug_printf_glob("start perform_glob: n:%d o->data:%p\n", n, o->data);
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00003142 if (!o->data)
3143 return o_save_ptr_helper(o, n);
3144 pattern = o->data + o_get_last_ptr(o, n);
Denis Vlasenko30c9cc52008-06-17 07:24:29 +00003145 debug_printf_glob("glob pattern '%s'\n", pattern);
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00003146 if (!glob_needed(pattern)) {
3147 literal:
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003148 /* unbackslash last string in o in place, fix length */
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00003149 o->length = unbackslash(pattern) - o->data;
Denis Vlasenko30c9cc52008-06-17 07:24:29 +00003150 debug_printf_glob("glob pattern '%s' is literal\n", pattern);
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00003151 return o_save_ptr_helper(o, n);
3152 }
3153
3154 memset(&globdata, 0, sizeof(globdata));
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003155 /* Can't use GLOB_NOCHECK: it does not unescape the string.
3156 * If we glob "*.\*" and don't find anything, we need
3157 * to fall back to using literal "*.*", but GLOB_NOCHECK
3158 * will return "*.\*"!
3159 */
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00003160 gr = glob(pattern, 0, NULL, &globdata);
3161 debug_printf_glob("glob('%s'):%d\n", pattern, gr);
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003162 if (gr != 0) {
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003163 if (gr == GLOB_NOMATCH) {
3164 globfree(&globdata);
3165 goto literal;
3166 }
3167 if (gr == GLOB_NOSPACE)
3168 bb_error_msg_and_die(bb_msg_memory_exhausted);
Denys Vlasenko5b2db972009-11-16 05:49:36 +01003169 /* GLOB_ABORTED? Only happens with GLOB_ERR flag,
3170 * but we didn't specify it. Paranoia again. */
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003171 bb_error_msg_and_die("glob error %d on '%s'", gr, pattern);
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00003172 }
3173 if (globdata.gl_pathv && globdata.gl_pathv[0]) {
3174 char **argv = globdata.gl_pathv;
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003175 /* "forget" pattern in o */
3176 o->length = pattern - o->data;
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00003177 while (1) {
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00003178 o_addstr_with_NUL(o, *argv);
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00003179 n = o_save_ptr_helper(o, n);
3180 argv++;
3181 if (!*argv)
3182 break;
3183 }
3184 }
3185 globfree(&globdata);
3186 if (DEBUG_GLOB)
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02003187 debug_print_list("perform_glob returning", o, n);
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00003188 return n;
3189}
3190
Denys Vlasenko238081f2010-10-03 14:26:26 +02003191#endif /* !HUSH_BRACE_EXPANSION */
Denys Vlasenkof3e28182009-11-17 03:35:31 +01003192
Denys Vlasenko5b686cb2010-09-08 13:44:34 +02003193/* If o->o_expflags & EXP_FLAG_GLOB, glob the string so far remembered.
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00003194 * Otherwise, just finish current list[] and start new */
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00003195static int o_save_ptr(o_string *o, int n)
3196{
Denys Vlasenko5b686cb2010-09-08 13:44:34 +02003197 if (o->o_expflags & EXP_FLAG_GLOB) {
Denis Vlasenkoa8b6dff2009-03-20 12:05:14 +00003198 /* If o->has_empty_slot, list[n] was already globbed
3199 * (if it was requested back then when it was filled)
3200 * so don't do that again! */
3201 if (!o->has_empty_slot)
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02003202 return perform_glob(o, n); /* o_save_ptr_helper is inside */
Denis Vlasenkoa8b6dff2009-03-20 12:05:14 +00003203 }
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00003204 return o_save_ptr_helper(o, n);
3205}
3206
3207/* "Please convert list[n] to real char* ptrs, and NULL terminate it." */
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00003208static char **o_finalize_list(o_string *o, int n)
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00003209{
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00003210 char **list;
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00003211 int string_start;
3212
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00003213 n = o_save_ptr(o, n); /* force growth for list[n] if necessary */
3214 if (DEBUG_EXPAND)
3215 debug_print_list("finalized", o, n);
Denis Vlasenko30c9cc52008-06-17 07:24:29 +00003216 debug_printf_expand("finalized n:%d\n", n);
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00003217 list = (char**)o->data;
3218 string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]);
3219 list[--n] = NULL;
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00003220 while (n) {
3221 n--;
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003222 list[n] = o->data + (int)(uintptr_t)list[n] + string_start;
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00003223 }
3224 return list;
3225}
3226
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003227static void free_pipe_list(struct pipe *pi);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003228
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003229/* Returns pi->next - next pipe in the list */
3230static struct pipe *free_pipe(struct pipe *pi)
Denis Vlasenkof886fd22008-10-13 12:36:05 +00003231{
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003232 struct pipe *next;
3233 int i;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003234
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003235 debug_printf_clean("free_pipe (pid %d)\n", getpid());
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003236 for (i = 0; i < pi->num_cmds; i++) {
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003237 struct command *command;
3238 struct redir_struct *r, *rnext;
3239
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003240 command = &pi->cmds[i];
Denis Vlasenko0701dca2009-04-11 10:38:47 +00003241 debug_printf_clean(" command %d:\n", i);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003242 if (command->argv) {
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003243 if (DEBUG_CLEAN) {
3244 int a;
3245 char **p;
3246 for (a = 0, p = command->argv; *p; a++, p++) {
3247 debug_printf_clean(" argv[%d] = %s\n", a, *p);
3248 }
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003249 }
3250 free_strings(command->argv);
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003251 //command->argv = NULL;
Denis Vlasenkob6e65562009-04-03 16:49:04 +00003252 }
3253 /* not "else if": on syntax error, we may have both! */
3254 if (command->group) {
Denys Vlasenko9d617c42009-06-09 18:40:52 +02003255 debug_printf_clean(" begin group (cmd_type:%d)\n",
3256 command->cmd_type);
Denis Vlasenko0701dca2009-04-11 10:38:47 +00003257 free_pipe_list(command->group);
3258 debug_printf_clean(" end group\n");
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003259 //command->group = NULL;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003260 }
Denis Vlasenkoed055212009-04-11 10:37:10 +00003261 /* else is crucial here.
3262 * If group != NULL, child_func is meaningless */
3263#if ENABLE_HUSH_FUNCTIONS
3264 else if (command->child_func) {
3265 debug_printf_exec("cmd %p releases child func at %p\n", command, command->child_func);
3266 command->child_func->parent_cmd = NULL;
3267 }
3268#endif
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00003269#if !BB_MMU
3270 free(command->group_as_string);
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003271 //command->group_as_string = NULL;
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00003272#endif
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003273 for (r = command->redirects; r; r = rnext) {
Denis Vlasenko0701dca2009-04-11 10:38:47 +00003274 debug_printf_clean(" redirect %d%s",
3275 r->rd_fd, redir_table[r->rd_type].descrip);
Denis Vlasenko02d6f1a2009-04-07 19:56:55 +00003276 /* guard against the case >$FOO, where foo is unset or blank */
3277 if (r->rd_filename) {
3278 debug_printf_clean(" fname:'%s'\n", r->rd_filename);
3279 free(r->rd_filename);
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003280 //r->rd_filename = NULL;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003281 }
Denis Vlasenko02d6f1a2009-04-07 19:56:55 +00003282 debug_printf_clean(" rd_dup:%d\n", r->rd_dup);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003283 rnext = r->next;
3284 free(r);
3285 }
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003286 //command->redirects = NULL;
Denis Vlasenkof886fd22008-10-13 12:36:05 +00003287 }
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003288 free(pi->cmds); /* children are an array, they get freed all at once */
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003289 //pi->cmds = NULL;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003290#if ENABLE_HUSH_JOB
3291 free(pi->cmdtext);
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003292 //pi->cmdtext = NULL;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003293#endif
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003294
3295 next = pi->next;
3296 free(pi);
3297 return next;
Denis Vlasenkof886fd22008-10-13 12:36:05 +00003298}
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00003299
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003300static void free_pipe_list(struct pipe *pi)
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003301{
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003302 while (pi) {
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003303#if HAS_KEYWORDS
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003304 debug_printf_clean("pipe reserved word %d\n", pi->res_word);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003305#endif
Denis Vlasenko0701dca2009-04-11 10:38:47 +00003306 debug_printf_clean("pipe followup code %d\n", pi->followup);
Denys Vlasenko27c56f12010-09-07 09:56:34 +02003307 pi = free_pipe(pi);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003308 }
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003309}
3310
3311
Denys Vlasenkob36abf22010-09-05 14:50:59 +02003312/*** Parsing routines ***/
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00003313
Denys Vlasenko7b4c0fd2010-11-22 17:58:14 +01003314#ifndef debug_print_tree
3315static void debug_print_tree(struct pipe *pi, int lvl)
3316{
3317 static const char *const PIPE[] = {
3318 [PIPE_SEQ] = "SEQ",
3319 [PIPE_AND] = "AND",
3320 [PIPE_OR ] = "OR" ,
3321 [PIPE_BG ] = "BG" ,
3322 };
3323 static const char *RES[] = {
3324 [RES_NONE ] = "NONE" ,
3325# if ENABLE_HUSH_IF
3326 [RES_IF ] = "IF" ,
3327 [RES_THEN ] = "THEN" ,
3328 [RES_ELIF ] = "ELIF" ,
3329 [RES_ELSE ] = "ELSE" ,
3330 [RES_FI ] = "FI" ,
3331# endif
3332# if ENABLE_HUSH_LOOPS
3333 [RES_FOR ] = "FOR" ,
3334 [RES_WHILE] = "WHILE",
3335 [RES_UNTIL] = "UNTIL",
3336 [RES_DO ] = "DO" ,
3337 [RES_DONE ] = "DONE" ,
3338# endif
3339# if ENABLE_HUSH_LOOPS || ENABLE_HUSH_CASE
3340 [RES_IN ] = "IN" ,
3341# endif
3342# if ENABLE_HUSH_CASE
3343 [RES_CASE ] = "CASE" ,
3344 [RES_CASE_IN ] = "CASE_IN" ,
3345 [RES_MATCH] = "MATCH",
3346 [RES_CASE_BODY] = "CASE_BODY",
3347 [RES_ESAC ] = "ESAC" ,
3348# endif
3349 [RES_XXXX ] = "XXXX" ,
3350 [RES_SNTX ] = "SNTX" ,
3351 };
3352 static const char *const CMDTYPE[] = {
3353 "{}",
3354 "()",
3355 "[noglob]",
3356# if ENABLE_HUSH_FUNCTIONS
3357 "func()",
3358# endif
3359 };
3360
3361 int pin, prn;
3362
3363 pin = 0;
3364 while (pi) {
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01003365 fdprintf(2, "%*spipe %d res_word=%s followup=%d %s\n", lvl*2, "",
Denys Vlasenko7b4c0fd2010-11-22 17:58:14 +01003366 pin, RES[pi->res_word], pi->followup, PIPE[pi->followup]);
3367 prn = 0;
3368 while (prn < pi->num_cmds) {
3369 struct command *command = &pi->cmds[prn];
3370 char **argv = command->argv;
3371
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01003372 fdprintf(2, "%*s cmd %d assignment_cnt:%d",
Denys Vlasenko7b4c0fd2010-11-22 17:58:14 +01003373 lvl*2, "", prn,
3374 command->assignment_cnt);
3375 if (command->group) {
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01003376 fdprintf(2, " group %s: (argv=%p)%s%s\n",
Denys Vlasenko7b4c0fd2010-11-22 17:58:14 +01003377 CMDTYPE[command->cmd_type],
3378 argv
3379# if !BB_MMU
3380 , " group_as_string:", command->group_as_string
3381# else
3382 , "", ""
3383# endif
3384 );
3385 debug_print_tree(command->group, lvl+1);
3386 prn++;
3387 continue;
3388 }
3389 if (argv) while (*argv) {
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01003390 fdprintf(2, " '%s'", *argv);
Denys Vlasenko7b4c0fd2010-11-22 17:58:14 +01003391 argv++;
3392 }
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01003393 fdprintf(2, "\n");
Denys Vlasenko7b4c0fd2010-11-22 17:58:14 +01003394 prn++;
3395 }
3396 pi = pi->next;
3397 pin++;
3398 }
3399}
3400#endif /* debug_print_tree */
3401
Denis Vlasenkoac678ec2007-04-16 22:32:04 +00003402static struct pipe *new_pipe(void)
3403{
Eric Andersen25f27032001-04-26 23:22:31 +00003404 struct pipe *pi;
Denis Vlasenko3ac0e002007-04-28 16:45:22 +00003405 pi = xzalloc(sizeof(struct pipe));
Denis Vlasenko5ec61322008-06-24 00:50:07 +00003406 /*pi->res_word = RES_NONE; - RES_NONE is 0 anyway */
Eric Andersen25f27032001-04-26 23:22:31 +00003407 return pi;
3408}
3409
Denis Vlasenkof8c1f022009-04-17 11:55:42 +00003410/* Command (member of a pipe) is complete, or we start a new pipe
3411 * if ctx->command is NULL.
3412 * No errors possible here.
3413 */
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003414static int done_command(struct parse_context *ctx)
3415{
3416 /* The command is really already in the pipe structure, so
3417 * advance the pipe counter and make a new, null command. */
3418 struct pipe *pi = ctx->pipe;
3419 struct command *command = ctx->command;
3420
Denys Vlasenkod6a37d82016-09-20 16:22:24 +02003421#if 0 /* Instead we emit error message at run time */
3422 if (ctx->pending_redirect) {
3423 /* For example, "cmd >" (no filename to redirect to) */
Denys Vlasenko39701202017-08-02 19:44:05 +02003424 syntax_error("invalid redirect");
Denys Vlasenkod6a37d82016-09-20 16:22:24 +02003425 ctx->pending_redirect = NULL;
3426 }
3427#endif
3428
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003429 if (command) {
Denis Vlasenkof8c1f022009-04-17 11:55:42 +00003430 if (IS_NULL_CMD(command)) {
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003431 debug_printf_parse("done_command: skipping null cmd, num_cmds=%d\n", pi->num_cmds);
Denis Vlasenkof8c1f022009-04-17 11:55:42 +00003432 goto clear_and_ret;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003433 }
3434 pi->num_cmds++;
3435 debug_printf_parse("done_command: ++num_cmds=%d\n", pi->num_cmds);
Denis Vlasenkocd418a22009-04-06 18:08:35 +00003436 //debug_print_tree(ctx->list_head, 20);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003437 } else {
3438 debug_printf_parse("done_command: initializing, num_cmds=%d\n", pi->num_cmds);
3439 }
3440
3441 /* Only real trickiness here is that the uncommitted
3442 * command structure is not counted in pi->num_cmds. */
3443 pi->cmds = xrealloc(pi->cmds, sizeof(*pi->cmds) * (pi->num_cmds+1));
Denis Vlasenkof8c1f022009-04-17 11:55:42 +00003444 ctx->command = command = &pi->cmds[pi->num_cmds];
3445 clear_and_ret:
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003446 memset(command, 0, sizeof(*command));
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003447 return pi->num_cmds; /* used only for 0/nonzero check */
3448}
3449
3450static void done_pipe(struct parse_context *ctx, pipe_style type)
3451{
3452 int not_null;
3453
3454 debug_printf_parse("done_pipe entered, followup %d\n", type);
3455 /* Close previous command */
3456 not_null = done_command(ctx);
Denis Vlasenkocd418a22009-04-06 18:08:35 +00003457#if HAS_KEYWORDS
3458 ctx->pipe->pi_inverted = ctx->ctx_inverted;
3459 ctx->ctx_inverted = 0;
3460 ctx->pipe->res_word = ctx->ctx_res_w;
3461#endif
Denys Vlasenkob24e55d2017-07-16 20:29:35 +02003462 if (type == PIPE_BG && ctx->list_head != ctx->pipe) {
3463 /* Necessary since && and || have precedence over &:
Denys Vlasenkoee553b92017-07-15 22:51:55 +02003464 * "cmd1 && cmd2 &" must spawn both cmds, not only cmd2,
3465 * in a backgrounded subshell.
3466 */
3467 struct pipe *pi;
3468 struct command *command;
3469
Denys Vlasenkob24e55d2017-07-16 20:29:35 +02003470 /* Is this actually this construct, all pipes end with && or ||? */
Denys Vlasenkoee553b92017-07-15 22:51:55 +02003471 pi = ctx->list_head;
3472 while (pi != ctx->pipe) {
3473 if (pi->followup != PIPE_AND && pi->followup != PIPE_OR)
3474 goto no_conv;
3475 pi = pi->next;
3476 }
3477
3478 debug_printf_parse("BG with more than one pipe, converting to { p1 &&...pN; } &\n");
3479 pi->followup = PIPE_SEQ; /* close pN _not_ with "&"! */
3480 pi = xzalloc(sizeof(*pi));
3481 pi->followup = PIPE_BG;
3482 pi->num_cmds = 1;
3483 pi->cmds = xzalloc(sizeof(pi->cmds[0]));
3484 command = &pi->cmds[0];
3485 if (CMD_NORMAL != 0) /* "if xzalloc didn't do that already" */
3486 command->cmd_type = CMD_NORMAL;
3487 command->group = ctx->list_head;
3488#if !BB_MMU
Denys Vlasenkob24e55d2017-07-16 20:29:35 +02003489 command->group_as_string = xstrndup(
3490 ctx->as_string.data,
3491 ctx->as_string.length - 1 /* do not copy last char, "&" */
3492 );
Denys Vlasenkoee553b92017-07-15 22:51:55 +02003493#endif
3494 /* Replace all pipes in ctx with one newly created */
3495 ctx->list_head = ctx->pipe = pi;
Denys Vlasenkob24e55d2017-07-16 20:29:35 +02003496 } else {
3497 no_conv:
3498 ctx->pipe->followup = type;
Denys Vlasenkoee553b92017-07-15 22:51:55 +02003499 }
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003500
3501 /* Without this check, even just <enter> on command line generates
3502 * tree of three NOPs (!). Which is harmless but annoying.
Denis Vlasenkof8c1f022009-04-17 11:55:42 +00003503 * IOW: it is safe to do it unconditionally. */
Denis Vlasenkocd418a22009-04-06 18:08:35 +00003504 if (not_null
Denis Vlasenko7f959372009-04-14 08:06:59 +00003505#if ENABLE_HUSH_IF
Denis Vlasenkocd418a22009-04-06 18:08:35 +00003506 || ctx->ctx_res_w == RES_FI
Denis Vlasenko7f959372009-04-14 08:06:59 +00003507#endif
3508#if ENABLE_HUSH_LOOPS
Denis Vlasenkocd418a22009-04-06 18:08:35 +00003509 || ctx->ctx_res_w == RES_DONE
3510 || ctx->ctx_res_w == RES_FOR
3511 || ctx->ctx_res_w == RES_IN
Denis Vlasenko7f959372009-04-14 08:06:59 +00003512#endif
3513#if ENABLE_HUSH_CASE
Denis Vlasenkocd418a22009-04-06 18:08:35 +00003514 || ctx->ctx_res_w == RES_ESAC
3515#endif
3516 ) {
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003517 struct pipe *new_p;
3518 debug_printf_parse("done_pipe: adding new pipe: "
3519 "not_null:%d ctx->ctx_res_w:%d\n",
3520 not_null, ctx->ctx_res_w);
3521 new_p = new_pipe();
3522 ctx->pipe->next = new_p;
3523 ctx->pipe = new_p;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003524 /* RES_THEN, RES_DO etc are "sticky" -
Denis Vlasenkof8c1f022009-04-17 11:55:42 +00003525 * they remain set for pipes inside if/while.
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003526 * This is used to control execution.
3527 * RES_FOR and RES_IN are NOT sticky (needed to support
3528 * cases where variable or value happens to match a keyword):
3529 */
3530#if ENABLE_HUSH_LOOPS
3531 if (ctx->ctx_res_w == RES_FOR
3532 || ctx->ctx_res_w == RES_IN)
3533 ctx->ctx_res_w = RES_NONE;
3534#endif
3535#if ENABLE_HUSH_CASE
3536 if (ctx->ctx_res_w == RES_MATCH)
Denys Vlasenkoe9bda902009-05-23 16:50:07 +02003537 ctx->ctx_res_w = RES_CASE_BODY;
3538 if (ctx->ctx_res_w == RES_CASE)
3539 ctx->ctx_res_w = RES_CASE_IN;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003540#endif
Denis Vlasenkob6e65562009-04-03 16:49:04 +00003541 ctx->command = NULL; /* trick done_command below */
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003542 /* Create the memory for command, roughly:
3543 * ctx->pipe->cmds = new struct command;
3544 * ctx->command = &ctx->pipe->cmds[0];
3545 */
3546 done_command(ctx);
Denis Vlasenkocd418a22009-04-06 18:08:35 +00003547 //debug_print_tree(ctx->list_head, 10);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003548 }
3549 debug_printf_parse("done_pipe return\n");
3550}
3551
Denis Vlasenko9af22c72008-10-09 12:54:58 +00003552static void initialize_context(struct parse_context *ctx)
Eric Andersen25f27032001-04-26 23:22:31 +00003553{
Denis Vlasenkoa8442002008-06-14 11:00:17 +00003554 memset(ctx, 0, sizeof(*ctx));
Denis Vlasenko1a735862007-05-23 00:32:25 +00003555 ctx->pipe = ctx->list_head = new_pipe();
Denis Vlasenko9af22c72008-10-09 12:54:58 +00003556 /* Create the memory for command, roughly:
3557 * ctx->pipe->cmds = new struct command;
3558 * ctx->command = &ctx->pipe->cmds[0];
Denis Vlasenkoa8442002008-06-14 11:00:17 +00003559 */
3560 done_command(ctx);
Eric Andersen25f27032001-04-26 23:22:31 +00003561}
3562
Denis Vlasenkoa8442002008-06-14 11:00:17 +00003563/* If a reserved word is found and processed, parse context is modified
3564 * and 1 is returned.
Eric Andersen25f27032001-04-26 23:22:31 +00003565 */
Denis Vlasenko5ec61322008-06-24 00:50:07 +00003566#if HAS_KEYWORDS
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003567struct reserved_combo {
3568 char literal[6];
3569 unsigned char res;
3570 unsigned char assignment_flag;
3571 int flag;
3572};
3573enum {
3574 FLAG_END = (1 << RES_NONE ),
Denys Vlasenkoc0836532009-10-19 13:13:06 +02003575# if ENABLE_HUSH_IF
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003576 FLAG_IF = (1 << RES_IF ),
3577 FLAG_THEN = (1 << RES_THEN ),
3578 FLAG_ELIF = (1 << RES_ELIF ),
3579 FLAG_ELSE = (1 << RES_ELSE ),
3580 FLAG_FI = (1 << RES_FI ),
Denys Vlasenkoc0836532009-10-19 13:13:06 +02003581# endif
3582# if ENABLE_HUSH_LOOPS
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003583 FLAG_FOR = (1 << RES_FOR ),
3584 FLAG_WHILE = (1 << RES_WHILE),
3585 FLAG_UNTIL = (1 << RES_UNTIL),
3586 FLAG_DO = (1 << RES_DO ),
3587 FLAG_DONE = (1 << RES_DONE ),
3588 FLAG_IN = (1 << RES_IN ),
Denys Vlasenkoc0836532009-10-19 13:13:06 +02003589# endif
3590# if ENABLE_HUSH_CASE
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003591 FLAG_MATCH = (1 << RES_MATCH),
3592 FLAG_ESAC = (1 << RES_ESAC ),
Denys Vlasenkoc0836532009-10-19 13:13:06 +02003593# endif
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003594 FLAG_START = (1 << RES_XXXX ),
3595};
3596
3597static const struct reserved_combo* match_reserved_word(o_string *word)
3598{
Eric Andersen25f27032001-04-26 23:22:31 +00003599 /* Mostly a list of accepted follow-up reserved words.
3600 * FLAG_END means we are done with the sequence, and are ready
3601 * to turn the compound list into a command.
3602 * FLAG_START means the word must start a new compound list.
3603 */
Denis Vlasenkoc72c1ed2007-01-30 22:31:26 +00003604 static const struct reserved_combo reserved_list[] = {
Denys Vlasenkoc0836532009-10-19 13:13:06 +02003605# if ENABLE_HUSH_IF
Denys Vlasenko29f9b722011-05-14 11:27:36 +02003606 { "!", RES_NONE, NOT_ASSIGNMENT , 0 },
3607 { "if", RES_IF, MAYBE_ASSIGNMENT, FLAG_THEN | FLAG_START },
3608 { "then", RES_THEN, MAYBE_ASSIGNMENT, FLAG_ELIF | FLAG_ELSE | FLAG_FI },
3609 { "elif", RES_ELIF, MAYBE_ASSIGNMENT, FLAG_THEN },
3610 { "else", RES_ELSE, MAYBE_ASSIGNMENT, FLAG_FI },
3611 { "fi", RES_FI, NOT_ASSIGNMENT , FLAG_END },
Denys Vlasenkoc0836532009-10-19 13:13:06 +02003612# endif
3613# if ENABLE_HUSH_LOOPS
Denys Vlasenko29f9b722011-05-14 11:27:36 +02003614 { "for", RES_FOR, NOT_ASSIGNMENT , FLAG_IN | FLAG_DO | FLAG_START },
3615 { "while", RES_WHILE, MAYBE_ASSIGNMENT, FLAG_DO | FLAG_START },
3616 { "until", RES_UNTIL, MAYBE_ASSIGNMENT, FLAG_DO | FLAG_START },
3617 { "in", RES_IN, NOT_ASSIGNMENT , FLAG_DO },
3618 { "do", RES_DO, MAYBE_ASSIGNMENT, FLAG_DONE },
3619 { "done", RES_DONE, NOT_ASSIGNMENT , FLAG_END },
Denys Vlasenkoc0836532009-10-19 13:13:06 +02003620# endif
3621# if ENABLE_HUSH_CASE
Denys Vlasenko29f9b722011-05-14 11:27:36 +02003622 { "case", RES_CASE, NOT_ASSIGNMENT , FLAG_MATCH | FLAG_START },
3623 { "esac", RES_ESAC, NOT_ASSIGNMENT , FLAG_END },
Denys Vlasenkoc0836532009-10-19 13:13:06 +02003624# endif
Eric Andersen25f27032001-04-26 23:22:31 +00003625 };
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003626 const struct reserved_combo *r;
3627
Denys Vlasenkoe4dcba12010-10-28 18:57:19 +02003628 for (r = reserved_list; r < reserved_list + ARRAY_SIZE(reserved_list); r++) {
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003629 if (strcmp(word->data, r->literal) == 0)
3630 return r;
3631 }
3632 return NULL;
3633}
Denis Vlasenkobb929512009-04-16 10:59:40 +00003634/* Return 0: not a keyword, 1: keyword
3635 */
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003636static int reserved_word(o_string *word, struct parse_context *ctx)
3637{
Denys Vlasenkoc0836532009-10-19 13:13:06 +02003638# if ENABLE_HUSH_CASE
Denis Vlasenko17f02e72008-07-14 04:32:29 +00003639 static const struct reserved_combo reserved_match = {
Denis Vlasenko2b576b82008-08-04 00:46:07 +00003640 "", RES_MATCH, NOT_ASSIGNMENT , FLAG_MATCH | FLAG_ESAC
Denis Vlasenko17f02e72008-07-14 04:32:29 +00003641 };
Denys Vlasenkoc0836532009-10-19 13:13:06 +02003642# endif
Denis Vlasenkoc72c1ed2007-01-30 22:31:26 +00003643 const struct reserved_combo *r;
Denis Vlasenkoc72c1ed2007-01-30 22:31:26 +00003644
Denys Vlasenko38292b62010-09-05 14:49:40 +02003645 if (word->has_quoted_part)
Denis Vlasenkobb929512009-04-16 10:59:40 +00003646 return 0;
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003647 r = match_reserved_word(word);
3648 if (!r)
3649 return 0;
3650
3651 debug_printf("found reserved word %s, res %d\n", r->literal, r->res);
Denys Vlasenkoc0836532009-10-19 13:13:06 +02003652# if ENABLE_HUSH_CASE
Denys Vlasenkoe9bda902009-05-23 16:50:07 +02003653 if (r->res == RES_IN && ctx->ctx_res_w == RES_CASE_IN) {
3654 /* "case word IN ..." - IN part starts first MATCH part */
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003655 r = &reserved_match;
Denys Vlasenkoe9bda902009-05-23 16:50:07 +02003656 } else
Denys Vlasenkoc0836532009-10-19 13:13:06 +02003657# endif
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003658 if (r->flag == 0) { /* '!' */
3659 if (ctx->ctx_inverted) { /* bash doesn't accept '! ! true' */
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00003660 syntax_error("! ! command");
Denis Vlasenkobb929512009-04-16 10:59:40 +00003661 ctx->ctx_res_w = RES_SNTX;
Eric Andersen25f27032001-04-26 23:22:31 +00003662 }
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003663 ctx->ctx_inverted = 1;
Denis Vlasenko1a735862007-05-23 00:32:25 +00003664 return 1;
Eric Andersen25f27032001-04-26 23:22:31 +00003665 }
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003666 if (r->flag & FLAG_START) {
Denis Vlasenkob6e65562009-04-03 16:49:04 +00003667 struct parse_context *old;
Denis Vlasenkobb929512009-04-16 10:59:40 +00003668
Denys Vlasenko9e55a152017-07-10 10:01:12 +02003669 old = xmemdup(ctx, sizeof(*ctx));
Denis Vlasenkob6e65562009-04-03 16:49:04 +00003670 debug_printf_parse("push stack %p\n", old);
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003671 initialize_context(ctx);
Denis Vlasenkob6e65562009-04-03 16:49:04 +00003672 ctx->stack = old;
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003673 } else if (/*ctx->ctx_res_w == RES_NONE ||*/ !(ctx->old_flag & (1 << r->res))) {
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00003674 syntax_error_at(word->data);
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003675 ctx->ctx_res_w = RES_SNTX;
3676 return 1;
Denis Vlasenkobb929512009-04-16 10:59:40 +00003677 } else {
3678 /* "{...} fi" is ok. "{...} if" is not
3679 * Example:
3680 * if { echo foo; } then { echo bar; } fi */
3681 if (ctx->command->group)
3682 done_pipe(ctx, PIPE_SEQ);
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003683 }
Denis Vlasenkobb929512009-04-16 10:59:40 +00003684
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003685 ctx->ctx_res_w = r->res;
3686 ctx->old_flag = r->flag;
Denis Vlasenkobb929512009-04-16 10:59:40 +00003687 word->o_assignment = r->assignment_flag;
Denys Vlasenko29f9b722011-05-14 11:27:36 +02003688 debug_printf_parse("word->o_assignment='%s'\n", assignment_flag[word->o_assignment]);
Denis Vlasenkobb929512009-04-16 10:59:40 +00003689
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003690 if (ctx->old_flag & FLAG_END) {
3691 struct parse_context *old;
Denis Vlasenkobb929512009-04-16 10:59:40 +00003692
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003693 done_pipe(ctx, PIPE_SEQ);
Denis Vlasenkob6e65562009-04-03 16:49:04 +00003694 debug_printf_parse("pop stack %p\n", ctx->stack);
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003695 old = ctx->stack;
3696 old->command->group = ctx->list_head;
Denys Vlasenko9d617c42009-06-09 18:40:52 +02003697 old->command->cmd_type = CMD_NORMAL;
Denys Vlasenkoc0836532009-10-19 13:13:06 +02003698# if !BB_MMU
Denys Vlasenkob5be13c2015-09-04 06:22:10 +02003699 /* At this point, the compound command's string is in
3700 * ctx->as_string... except for the leading keyword!
3701 * Consider this example: "echo a | if true; then echo a; fi"
3702 * ctx->as_string will contain "true; then echo a; fi",
3703 * with "if " remaining in old->as_string!
3704 */
3705 {
3706 char *str;
3707 int len = old->as_string.length;
3708 /* Concatenate halves */
3709 o_addstr(&old->as_string, ctx->as_string.data);
3710 o_free_unsafe(&ctx->as_string);
3711 /* Find where leading keyword starts in first half */
3712 str = old->as_string.data + len;
3713 if (str > old->as_string.data)
3714 str--; /* skip whitespace after keyword */
3715 while (str > old->as_string.data && isalpha(str[-1]))
3716 str--;
3717 /* Ugh, we're done with this horrid hack */
3718 old->command->group_as_string = xstrdup(str);
3719 debug_printf_parse("pop, remembering as:'%s'\n",
3720 old->command->group_as_string);
3721 }
Denys Vlasenkoc0836532009-10-19 13:13:06 +02003722# endif
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003723 *ctx = *old; /* physical copy */
3724 free(old);
3725 }
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003726 return 1;
Eric Andersen25f27032001-04-26 23:22:31 +00003727}
Denys Vlasenkoc0836532009-10-19 13:13:06 +02003728#endif /* HAS_KEYWORDS */
Eric Andersen25f27032001-04-26 23:22:31 +00003729
Denis Vlasenkoa8442002008-06-14 11:00:17 +00003730/* Word is complete, look at it and update parsing context.
Denis Vlasenkob6e65562009-04-03 16:49:04 +00003731 * Normal return is 0. Syntax errors return 1.
3732 * Note: on return, word is reset, but not o_free'd!
3733 */
Denis Vlasenko9af22c72008-10-09 12:54:58 +00003734static int done_word(o_string *word, struct parse_context *ctx)
Eric Andersen25f27032001-04-26 23:22:31 +00003735{
Denis Vlasenko9af22c72008-10-09 12:54:58 +00003736 struct command *command = ctx->command;
Eric Andersen25f27032001-04-26 23:22:31 +00003737
Denis Vlasenko9af22c72008-10-09 12:54:58 +00003738 debug_printf_parse("done_word entered: '%s' %p\n", word->data, command);
Denys Vlasenko38292b62010-09-05 14:49:40 +02003739 if (word->length == 0 && !word->has_quoted_part) {
Denis Vlasenkoab876cd2008-06-18 16:29:32 +00003740 debug_printf_parse("done_word return 0: true null, ignored\n");
3741 return 0;
Eric Andersen25f27032001-04-26 23:22:31 +00003742 }
Denis Vlasenko2b576b82008-08-04 00:46:07 +00003743
Eric Andersen25f27032001-04-26 23:22:31 +00003744 if (ctx->pending_redirect) {
Denis Vlasenkoab876cd2008-06-18 16:29:32 +00003745 /* We do not glob in e.g. >*.tmp case. bash seems to glob here
3746 * only if run as "bash", not "sh" */
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00003747 /* http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html
3748 * "2.7 Redirection
3749 * ...the word that follows the redirection operator
3750 * shall be subjected to tilde expansion, parameter expansion,
3751 * command substitution, arithmetic expansion, and quote
3752 * removal. Pathname expansion shall not be performed
3753 * on the word by a non-interactive shell; an interactive
3754 * shell may perform it, but shall do so only when
3755 * the expansion would result in one word."
3756 */
Denis Vlasenkoab876cd2008-06-18 16:29:32 +00003757 ctx->pending_redirect->rd_filename = xstrdup(word->data);
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00003758 /* Cater for >\file case:
3759 * >\a creates file a; >\\a, >"\a", >"\\a" create file \a
3760 * Same with heredocs:
3761 * for <<\H delim is H; <<\\H, <<"\H", <<"\\H" - \H
3762 */
Denys Vlasenkoe640cb42009-05-28 16:49:11 +02003763 if (ctx->pending_redirect->rd_type == REDIRECT_HEREDOC) {
3764 unbackslash(ctx->pending_redirect->rd_filename);
3765 /* Is it <<"HEREDOC"? */
Denys Vlasenko38292b62010-09-05 14:49:40 +02003766 if (word->has_quoted_part) {
Denys Vlasenkoe640cb42009-05-28 16:49:11 +02003767 ctx->pending_redirect->rd_dup |= HEREDOC_QUOTED;
3768 }
Denis Vlasenko02d6f1a2009-04-07 19:56:55 +00003769 }
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00003770 debug_printf_parse("word stored in rd_filename: '%s'\n", word->data);
Denis Vlasenko1fd1ea42009-04-10 12:03:20 +00003771 ctx->pending_redirect = NULL;
Eric Andersen25f27032001-04-26 23:22:31 +00003772 } else {
Denis Vlasenko5ec61322008-06-24 00:50:07 +00003773#if HAS_KEYWORDS
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00003774# if ENABLE_HUSH_CASE
Denis Vlasenko757361f2008-07-14 08:26:47 +00003775 if (ctx->ctx_dsemicolon
3776 && strcmp(word->data, "esac") != 0 /* not "... pattern) cmd;; esac" */
3777 ) {
Denis Vlasenko395ae452008-07-14 06:29:38 +00003778 /* already done when ctx_dsemicolon was set to 1: */
Denis Vlasenko17f02e72008-07-14 04:32:29 +00003779 /* ctx->ctx_res_w = RES_MATCH; */
3780 ctx->ctx_dsemicolon = 0;
3781 } else
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00003782# endif
Denis Vlasenko9af22c72008-10-09 12:54:58 +00003783 if (!command->argv /* if it's the first word... */
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00003784# if ENABLE_HUSH_LOOPS
Denis Vlasenko733e3fb2008-07-06 10:01:13 +00003785 && ctx->ctx_res_w != RES_FOR /* ...not after FOR or IN */
3786 && ctx->ctx_res_w != RES_IN
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00003787# endif
Denys Vlasenkoe9bda902009-05-23 16:50:07 +02003788# if ENABLE_HUSH_CASE
3789 && ctx->ctx_res_w != RES_CASE
3790# endif
Denis Vlasenko733e3fb2008-07-06 10:01:13 +00003791 ) {
Denys Vlasenko29f9b722011-05-14 11:27:36 +02003792 int reserved = reserved_word(word, ctx);
3793 debug_printf_parse("checking for reserved-ness: %d\n", reserved);
3794 if (reserved) {
Denis Vlasenko0b677d82009-04-10 13:49:10 +00003795 o_reset_to_empty_unquoted(word);
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00003796 debug_printf_parse("done_word return %d\n",
3797 (ctx->ctx_res_w == RES_SNTX));
Denis Vlasenko5ec61322008-06-24 00:50:07 +00003798 return (ctx->ctx_res_w == RES_SNTX);
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00003799 }
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01003800# if BASH_TEST2
Denys Vlasenko9d617c42009-06-09 18:40:52 +02003801 if (strcmp(word->data, "[[") == 0) {
3802 command->cmd_type = CMD_SINGLEWORD_NOGLOB;
3803 }
3804 /* fall through */
Denys Vlasenko9ca656b2009-06-10 13:39:35 +02003805# endif
Eric Andersen25f27032001-04-26 23:22:31 +00003806 }
Denis Vlasenko5ec61322008-06-24 00:50:07 +00003807#endif
Denis Vlasenkobb929512009-04-16 10:59:40 +00003808 if (command->group) {
3809 /* "{ echo foo; } echo bar" - bad */
3810 syntax_error_at(word->data);
3811 debug_printf_parse("done_word return 1: syntax error, "
3812 "groups and arglists don't mix\n");
3813 return 1;
3814 }
Denys Vlasenko29f9b722011-05-14 11:27:36 +02003815
3816 /* If this word wasn't an assignment, next ones definitely
3817 * can't be assignments. Even if they look like ones. */
3818 if (word->o_assignment != DEFINITELY_ASSIGNMENT
3819 && word->o_assignment != WORD_IS_KEYWORD
3820 ) {
3821 word->o_assignment = NOT_ASSIGNMENT;
3822 } else {
3823 if (word->o_assignment == DEFINITELY_ASSIGNMENT) {
3824 command->assignment_cnt++;
3825 debug_printf_parse("++assignment_cnt=%d\n", command->assignment_cnt);
3826 }
3827 debug_printf_parse("word->o_assignment was:'%s'\n", assignment_flag[word->o_assignment]);
3828 word->o_assignment = MAYBE_ASSIGNMENT;
3829 }
3830 debug_printf_parse("word->o_assignment='%s'\n", assignment_flag[word->o_assignment]);
3831
Denys Vlasenko38292b62010-09-05 14:49:40 +02003832 if (word->has_quoted_part
Denis Vlasenko55789c62008-06-18 16:30:42 +00003833 /* optimization: and if it's ("" or '') or ($v... or `cmd`...): */
3834 && (word->data[0] == '\0' || word->data[0] == SPECIAL_VAR_SYMBOL)
Denis Vlasenko733e3fb2008-07-06 10:01:13 +00003835 /* (otherwise it's known to be not empty and is already safe) */
Denis Vlasenkoab876cd2008-06-18 16:29:32 +00003836 ) {
Denis Vlasenko733e3fb2008-07-06 10:01:13 +00003837 /* exclude "$@" - it can expand to no word despite "" */
Denis Vlasenkoafdcd122008-07-05 17:40:04 +00003838 char *p = word->data;
3839 while (p[0] == SPECIAL_VAR_SYMBOL
3840 && (p[1] & 0x7f) == '@'
3841 && p[2] == SPECIAL_VAR_SYMBOL
3842 ) {
3843 p += 3;
3844 }
Denis Vlasenkoc1c63b62008-06-18 09:20:35 +00003845 }
Denis Vlasenko22d10a02008-10-13 08:53:43 +00003846 command->argv = add_string_to_strings(command->argv, xstrdup(word->data));
Denis Vlasenko9af22c72008-10-09 12:54:58 +00003847 debug_print_strings("word appended to argv", command->argv);
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00003848 }
Eric Andersen25f27032001-04-26 23:22:31 +00003849
Denis Vlasenko06810332007-05-21 23:30:54 +00003850#if ENABLE_HUSH_LOOPS
Denis Vlasenko733e3fb2008-07-06 10:01:13 +00003851 if (ctx->ctx_res_w == RES_FOR) {
Denys Vlasenko38292b62010-09-05 14:49:40 +02003852 if (word->has_quoted_part
Denis Vlasenko1fd1ea42009-04-10 12:03:20 +00003853 || !is_well_formed_var_name(command->argv[0], '\0')
3854 ) {
Denis Vlasenkob7d8c0d2009-04-10 19:05:43 +00003855 /* bash says just "not a valid identifier" */
Denis Vlasenko1fd1ea42009-04-10 12:03:20 +00003856 syntax_error("not a valid identifier in for");
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00003857 return 1;
3858 }
Denis Vlasenko1fd1ea42009-04-10 12:03:20 +00003859 /* Force FOR to have just one word (variable name) */
3860 /* NB: basically, this makes hush see "for v in ..."
3861 * syntax as if it is "for v; in ...". FOR and IN become
3862 * two pipe structs in parse tree. */
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00003863 done_pipe(ctx, PIPE_SEQ);
Denis Vlasenko733e3fb2008-07-06 10:01:13 +00003864 }
Denis Vlasenko06810332007-05-21 23:30:54 +00003865#endif
Denis Vlasenko17f02e72008-07-14 04:32:29 +00003866#if ENABLE_HUSH_CASE
3867 /* Force CASE to have just one word */
3868 if (ctx->ctx_res_w == RES_CASE) {
3869 done_pipe(ctx, PIPE_SEQ);
3870 }
3871#endif
Denis Vlasenko1fd1ea42009-04-10 12:03:20 +00003872
Denis Vlasenko0b677d82009-04-10 13:49:10 +00003873 o_reset_to_empty_unquoted(word);
Denis Vlasenko1fd1ea42009-04-10 12:03:20 +00003874
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00003875 debug_printf_parse("done_word return 0\n");
Eric Andersen25f27032001-04-26 23:22:31 +00003876 return 0;
3877}
3878
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00003879
3880/* Peek ahead in the input to find out if we have a "&n" construct,
3881 * as in "2>&1", that represents duplicating a file descriptor.
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00003882 * Return:
3883 * REDIRFD_CLOSE if >&- "close fd" construct is seen,
3884 * REDIRFD_SYNTAX_ERR if syntax error,
3885 * REDIRFD_TO_FILE if no & was seen,
3886 * or the number found.
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00003887 */
3888#if BB_MMU
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00003889#define parse_redir_right_fd(as_string, input) \
3890 parse_redir_right_fd(input)
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00003891#endif
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00003892static int parse_redir_right_fd(o_string *as_string, struct in_str *input)
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00003893{
3894 int ch, d, ok;
3895
3896 ch = i_peek(input);
3897 if (ch != '&')
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00003898 return REDIRFD_TO_FILE;
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00003899
3900 ch = i_getch(input); /* get the & */
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00003901 nommu_addchr(as_string, ch);
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00003902 ch = i_peek(input);
3903 if (ch == '-') {
3904 ch = i_getch(input);
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00003905 nommu_addchr(as_string, ch);
Denis Vlasenko02d6f1a2009-04-07 19:56:55 +00003906 return REDIRFD_CLOSE;
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00003907 }
3908 d = 0;
3909 ok = 0;
3910 while (ch != EOF && isdigit(ch)) {
3911 d = d*10 + (ch-'0');
3912 ok = 1;
3913 ch = i_getch(input);
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00003914 nommu_addchr(as_string, ch);
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00003915 ch = i_peek(input);
3916 }
3917 if (ok) return d;
3918
3919//TODO: this is the place to catch ">&file" bashism (redirect both fd 1 and 2)
3920
3921 bb_error_msg("ambiguous redirect");
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00003922 return REDIRFD_SYNTAX_ERR;
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00003923}
3924
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00003925/* Return code is 0 normal, 1 if a syntax error is detected
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00003926 */
3927static int parse_redirect(struct parse_context *ctx,
3928 int fd,
3929 redir_type style,
3930 struct in_str *input)
3931{
3932 struct command *command = ctx->command;
3933 struct redir_struct *redir;
3934 struct redir_struct **redirp;
3935 int dup_num;
3936
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00003937 dup_num = REDIRFD_TO_FILE;
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00003938 if (style != REDIRECT_HEREDOC) {
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00003939 /* Check for a '>&1' type redirect */
3940 dup_num = parse_redir_right_fd(&ctx->as_string, input);
3941 if (dup_num == REDIRFD_SYNTAX_ERR)
3942 return 1;
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00003943 } else {
3944 int ch = i_peek(input);
Denis Vlasenko02d6f1a2009-04-07 19:56:55 +00003945 dup_num = (ch == '-'); /* HEREDOC_SKIPTABS bit is 1 */
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00003946 if (dup_num) { /* <<-... */
3947 ch = i_getch(input);
3948 nommu_addchr(&ctx->as_string, ch);
3949 ch = i_peek(input);
3950 }
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00003951 }
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00003952
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00003953 if (style == REDIRECT_OVERWRITE && dup_num == REDIRFD_TO_FILE) {
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00003954 int ch = i_peek(input);
3955 if (ch == '|') {
3956 /* >|FILE redirect ("clobbering" >).
3957 * Since we do not support "set -o noclobber" yet,
3958 * >| and > are the same for now. Just eat |.
3959 */
3960 ch = i_getch(input);
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00003961 nommu_addchr(&ctx->as_string, ch);
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00003962 }
3963 }
3964
3965 /* Create a new redir_struct and append it to the linked list */
3966 redirp = &command->redirects;
3967 while ((redir = *redirp) != NULL) {
3968 redirp = &(redir->next);
3969 }
3970 *redirp = redir = xzalloc(sizeof(*redir));
3971 /* redir->next = NULL; */
3972 /* redir->rd_filename = NULL; */
3973 redir->rd_type = style;
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00003974 redir->rd_fd = (fd == -1) ? redir_table[style].default_fd : fd;
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00003975
Denis Vlasenko02d6f1a2009-04-07 19:56:55 +00003976 debug_printf_parse("redirect type %d %s\n", redir->rd_fd,
3977 redir_table[style].descrip);
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00003978
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00003979 redir->rd_dup = dup_num;
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00003980 if (style != REDIRECT_HEREDOC && dup_num != REDIRFD_TO_FILE) {
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00003981 /* Erik had a check here that the file descriptor in question
3982 * is legit; I postpone that to "run time"
3983 * A "-" representation of "close me" shows up as a -3 here */
Denis Vlasenko02d6f1a2009-04-07 19:56:55 +00003984 debug_printf_parse("duplicating redirect '%d>&%d'\n",
3985 redir->rd_fd, redir->rd_dup);
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00003986 } else {
Denys Vlasenkod6a37d82016-09-20 16:22:24 +02003987#if 0 /* Instead we emit error message at run time */
3988 if (ctx->pending_redirect) {
3989 /* For example, "cmd > <file" */
Denys Vlasenko39701202017-08-02 19:44:05 +02003990 syntax_error("invalid redirect");
Denys Vlasenkod6a37d82016-09-20 16:22:24 +02003991 }
3992#endif
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00003993 /* Set ctx->pending_redirect, so we know what to do at the
3994 * end of the next parsed word. */
3995 ctx->pending_redirect = redir;
3996 }
3997 return 0;
3998}
3999
Eric Andersen25f27032001-04-26 23:22:31 +00004000/* If a redirect is immediately preceded by a number, that number is
4001 * supposed to tell which file descriptor to redirect. This routine
4002 * looks for such preceding numbers. In an ideal world this routine
4003 * needs to handle all the following classes of redirects...
4004 * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo
4005 * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo
4006 * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo
4007 * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004008 *
4009 * http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html
4010 * "2.7 Redirection
4011 * ... If n is quoted, the number shall not be recognized as part of
4012 * the redirection expression. For example:
4013 * echo \2>a
4014 * writes the character 2 into file a"
Denys Vlasenko38292b62010-09-05 14:49:40 +02004015 * We are getting it right by setting ->has_quoted_part on any \<char>
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004016 *
4017 * A -1 return means no valid number was found,
4018 * the caller should use the appropriate default for this redirection.
Eric Andersen25f27032001-04-26 23:22:31 +00004019 */
4020static int redirect_opt_num(o_string *o)
4021{
4022 int num;
4023
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004024 if (o->data == NULL)
Denis Vlasenkobb81c582007-01-30 22:32:09 +00004025 return -1;
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004026 num = bb_strtou(o->data, NULL, 10);
4027 if (errno || num < 0)
4028 return -1;
Denis Vlasenko0b677d82009-04-10 13:49:10 +00004029 o_reset_to_empty_unquoted(o);
Eric Andersen25f27032001-04-26 23:22:31 +00004030 return num;
4031}
4032
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004033#if BB_MMU
4034#define fetch_till_str(as_string, input, word, skip_tabs) \
4035 fetch_till_str(input, word, skip_tabs)
4036#endif
4037static char *fetch_till_str(o_string *as_string,
4038 struct in_str *input,
4039 const char *word,
Denys Vlasenko77b32cc2010-09-06 11:27:32 +02004040 int heredoc_flags)
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004041{
4042 o_string heredoc = NULL_O_STRING;
Denys Vlasenko5b6210c2010-09-09 13:32:21 +02004043 unsigned past_EOL;
Denys Vlasenko77b32cc2010-09-06 11:27:32 +02004044 int prev = 0; /* not \ */
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004045 int ch;
4046
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004047 goto jump_in;
Denys Vlasenkob8709032011-05-08 21:20:01 +02004048
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004049 while (1) {
4050 ch = i_getch(input);
Denys Vlasenko5b6210c2010-09-09 13:32:21 +02004051 if (ch != EOF)
4052 nommu_addchr(as_string, ch);
Denys Vlasenko0f018b32017-07-29 20:43:26 +02004053 if (ch == '\n' || ch == EOF) {
4054 check_heredoc_end:
4055 if ((heredoc_flags & HEREDOC_QUOTED) || prev != '\\') {
4056 if (strcmp(heredoc.data + past_EOL, word) == 0) {
4057 heredoc.data[past_EOL] = '\0';
4058 debug_printf_parse("parsed heredoc '%s'\n", heredoc.data);
4059 return heredoc.data;
4060 }
4061 if (ch == '\n') {
4062 /* This is a new line.
4063 * Remember position and backslash-escaping status.
4064 */
4065 o_addchr(&heredoc, ch);
4066 prev = ch;
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004067 jump_in:
Denys Vlasenko0f018b32017-07-29 20:43:26 +02004068 past_EOL = heredoc.length;
4069 /* Get 1st char of next line, possibly skipping leading tabs */
4070 do {
4071 ch = i_getch(input);
4072 if (ch != EOF)
4073 nommu_addchr(as_string, ch);
4074 } while ((heredoc_flags & HEREDOC_SKIPTABS) && ch == '\t');
4075 /* If this immediately ended the line,
4076 * go back to end-of-line checks.
4077 */
4078 if (ch == '\n')
4079 goto check_heredoc_end;
4080 }
Denys Vlasenko5b6210c2010-09-09 13:32:21 +02004081 }
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004082 }
4083 if (ch == EOF) {
4084 o_free_unsafe(&heredoc);
4085 return NULL;
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004086 }
4087 o_addchr(&heredoc, ch);
Denys Vlasenko5b6210c2010-09-09 13:32:21 +02004088 nommu_addchr(as_string, ch);
Denys Vlasenkoc3adfac2010-09-06 11:46:03 +02004089 if (prev == '\\' && ch == '\\')
4090 /* Correctly handle foo\\<eol> (not a line cont.) */
4091 prev = 0; /* not \ */
4092 else
4093 prev = ch;
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004094 }
4095}
4096
Denis Vlasenko3dfb0352009-04-08 09:29:14 +00004097/* Look at entire parse tree for not-yet-loaded REDIRECT_HEREDOCs
4098 * and load them all. There should be exactly heredoc_cnt of them.
4099 */
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004100static int fetch_heredocs(int heredoc_cnt, struct parse_context *ctx, struct in_str *input)
4101{
4102 struct pipe *pi = ctx->list_head;
4103
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00004104 while (pi && heredoc_cnt) {
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004105 int i;
4106 struct command *cmd = pi->cmds;
4107
4108 debug_printf_parse("fetch_heredocs: num_cmds:%d cmd argv0:'%s'\n",
4109 pi->num_cmds,
4110 cmd->argv ? cmd->argv[0] : "NONE");
4111 for (i = 0; i < pi->num_cmds; i++) {
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004112 struct redir_struct *redir = cmd->redirects;
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004113
4114 debug_printf_parse("fetch_heredocs: %d cmd argv0:'%s'\n",
4115 i, cmd->argv ? cmd->argv[0] : "NONE");
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004116 while (redir) {
4117 if (redir->rd_type == REDIRECT_HEREDOC) {
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004118 char *p;
4119
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004120 redir->rd_type = REDIRECT_HEREDOC2;
Denys Vlasenko764b2f02009-06-07 16:05:04 +02004121 /* redir->rd_dup is (ab)used to indicate <<- */
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004122 p = fetch_till_str(&ctx->as_string, input,
Denys Vlasenko77b32cc2010-09-06 11:27:32 +02004123 redir->rd_filename, redir->rd_dup);
Denis Vlasenko3dfb0352009-04-08 09:29:14 +00004124 if (!p) {
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00004125 syntax_error("unexpected EOF in here document");
Denis Vlasenko3dfb0352009-04-08 09:29:14 +00004126 return 1;
4127 }
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004128 free(redir->rd_filename);
4129 redir->rd_filename = p;
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004130 heredoc_cnt--;
4131 }
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004132 redir = redir->next;
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004133 }
4134 cmd++;
4135 }
4136 pi = pi->next;
4137 }
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00004138#if 0
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004139 /* Should be 0. If it isn't, it's a parse error */
Denis Vlasenko3dfb0352009-04-08 09:29:14 +00004140 if (heredoc_cnt)
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00004141 bb_error_msg_and_die("heredoc BUG 2");
4142#endif
4143 return 0;
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004144}
4145
4146
Denys Vlasenkob36abf22010-09-05 14:50:59 +02004147static int run_list(struct pipe *pi);
4148#if BB_MMU
4149#define parse_stream(pstring, input, end_trigger) \
4150 parse_stream(input, end_trigger)
4151#endif
4152static struct pipe *parse_stream(char **pstring,
4153 struct in_str *input,
4154 int end_trigger);
Denis Vlasenkoba7cf262007-05-25 14:34:30 +00004155
Eric Andersen25f27032001-04-26 23:22:31 +00004156
Denys Vlasenkoc2704542009-11-20 19:14:19 +01004157#if !ENABLE_HUSH_FUNCTIONS
4158#define parse_group(dest, ctx, input, ch) \
4159 parse_group(ctx, input, ch)
4160#endif
Denis Vlasenko9af22c72008-10-09 12:54:58 +00004161static int parse_group(o_string *dest, struct parse_context *ctx,
Eric Andersen25f27032001-04-26 23:22:31 +00004162 struct in_str *input, int ch)
4163{
Denis Vlasenko371de4a2008-10-14 12:43:13 +00004164 /* dest contains characters seen prior to ( or {.
Denis Vlasenko027e3fd2009-04-02 22:50:40 +00004165 * Typically it's empty, but for function defs,
Denis Vlasenko371de4a2008-10-14 12:43:13 +00004166 * it contains function name (without '()'). */
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004167 struct pipe *pipe_list;
Denis Vlasenko240c2552009-04-03 03:45:05 +00004168 int endch;
Denis Vlasenko9af22c72008-10-09 12:54:58 +00004169 struct command *command = ctx->command;
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00004170
4171 debug_printf_parse("parse_group entered\n");
Denis Vlasenko371de4a2008-10-14 12:43:13 +00004172#if ENABLE_HUSH_FUNCTIONS
Denys Vlasenko38292b62010-09-05 14:49:40 +02004173 if (ch == '(' && !dest->has_quoted_part) {
Denis Vlasenkoc0ea3292009-04-10 21:22:02 +00004174 if (dest->length)
Denis Vlasenkobb929512009-04-16 10:59:40 +00004175 if (done_word(dest, ctx))
4176 return 1;
Denis Vlasenkoc0ea3292009-04-10 21:22:02 +00004177 if (!command->argv)
4178 goto skip; /* (... */
4179 if (command->argv[1]) { /* word word ... (... */
4180 syntax_error_unexpected_ch('(');
4181 return 1;
Denis Vlasenkob7d8c0d2009-04-10 19:05:43 +00004182 }
Denis Vlasenkoc0ea3292009-04-10 21:22:02 +00004183 /* it is "word(..." or "word (..." */
4184 do
4185 ch = i_getch(input);
4186 while (ch == ' ' || ch == '\t');
4187 if (ch != ')') {
4188 syntax_error_unexpected_ch(ch);
4189 return 1;
4190 }
4191 nommu_addchr(&ctx->as_string, ch);
4192 do
4193 ch = i_getch(input);
4194 while (ch == ' ' || ch == '\t' || ch == '\n');
4195 if (ch != '{') {
4196 syntax_error_unexpected_ch(ch);
4197 return 1;
4198 }
4199 nommu_addchr(&ctx->as_string, ch);
Denys Vlasenko9d617c42009-06-09 18:40:52 +02004200 command->cmd_type = CMD_FUNCDEF;
Denis Vlasenkoc0ea3292009-04-10 21:22:02 +00004201 goto skip;
Denis Vlasenko371de4a2008-10-14 12:43:13 +00004202 }
4203#endif
Denys Vlasenkod8389ad2009-11-16 03:18:46 +01004204
4205#if 0 /* Prevented by caller */
Denis Vlasenkob7d8c0d2009-04-10 19:05:43 +00004206 if (command->argv /* word [word]{... */
4207 || dest->length /* word{... */
Denys Vlasenko38292b62010-09-05 14:49:40 +02004208 || dest->has_quoted_part /* ""{... */
Denis Vlasenko9af22c72008-10-09 12:54:58 +00004209 ) {
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00004210 syntax_error(NULL);
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004211 debug_printf_parse("parse_group return 1: "
4212 "syntax error, groups and arglists don't mix\n");
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00004213 return 1;
Eric Andersen25f27032001-04-26 23:22:31 +00004214 }
Denys Vlasenkod8389ad2009-11-16 03:18:46 +01004215#endif
Denis Vlasenkob7d8c0d2009-04-10 19:05:43 +00004216
4217#if ENABLE_HUSH_FUNCTIONS
4218 skip:
4219#endif
Denis Vlasenko240c2552009-04-03 03:45:05 +00004220 endch = '}';
Denis Vlasenko90e485c2007-05-23 15:22:50 +00004221 if (ch == '(') {
Denis Vlasenko240c2552009-04-03 03:45:05 +00004222 endch = ')';
Denys Vlasenko9d617c42009-06-09 18:40:52 +02004223 command->cmd_type = CMD_SUBSHELL;
Denis Vlasenkof8c1f022009-04-17 11:55:42 +00004224 } else {
4225 /* bash does not allow "{echo...", requires whitespace */
Denys Vlasenko672a55e2016-11-04 18:46:14 +01004226 ch = i_peek(input);
4227 if (ch != ' ' && ch != '\t' && ch != '\n'
4228 && ch != '(' /* but "{(..." is allowed (without whitespace) */
4229 ) {
Denis Vlasenkof8c1f022009-04-17 11:55:42 +00004230 syntax_error_unexpected_ch(ch);
4231 return 1;
4232 }
Denys Vlasenko672a55e2016-11-04 18:46:14 +01004233 if (ch != '(') {
4234 ch = i_getch(input);
4235 nommu_addchr(&ctx->as_string, ch);
4236 }
Eric Andersen25f27032001-04-26 23:22:31 +00004237 }
Denis Vlasenkob7d8c0d2009-04-10 19:05:43 +00004238
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00004239 {
Denys Vlasenkoddc62f62010-05-22 00:53:32 +02004240#if BB_MMU
4241# define as_string NULL
4242#else
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00004243 char *as_string = NULL;
4244#endif
4245 pipe_list = parse_stream(&as_string, input, endch);
4246#if !BB_MMU
4247 if (as_string)
4248 o_addstr(&ctx->as_string, as_string);
4249#endif
4250 /* empty ()/{} or parse error? */
4251 if (!pipe_list || pipe_list == ERR_PTR) {
Denis Vlasenkobb929512009-04-16 10:59:40 +00004252 /* parse_stream already emitted error msg */
Denys Vlasenkoddc62f62010-05-22 00:53:32 +02004253 if (!BB_MMU)
4254 free(as_string);
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00004255 debug_printf_parse("parse_group return 1: "
4256 "parse_stream returned %p\n", pipe_list);
4257 return 1;
4258 }
4259 command->group = pipe_list;
4260#if !BB_MMU
4261 as_string[strlen(as_string) - 1] = '\0'; /* plink ')' or '}' */
4262 command->group_as_string = as_string;
4263 debug_printf_parse("end of group, remembering as:'%s'\n",
4264 command->group_as_string);
4265#endif
Denys Vlasenkoddc62f62010-05-22 00:53:32 +02004266#undef as_string
Denis Vlasenkof8d01d32008-06-14 17:13:20 +00004267 }
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004268 debug_printf_parse("parse_group return 0\n");
4269 return 0;
Denis Vlasenko9af22c72008-10-09 12:54:58 +00004270 /* command remains "open", available for possible redirects */
Eric Andersen25f27032001-04-26 23:22:31 +00004271}
4272
Denys Vlasenko46e64982016-09-29 19:50:55 +02004273static int i_getch_and_eat_bkslash_nl(struct in_str *input)
4274{
4275 for (;;) {
4276 int ch, ch2;
4277
4278 ch = i_getch(input);
4279 if (ch != '\\')
4280 return ch;
4281 ch2 = i_peek(input);
4282 if (ch2 != '\n')
4283 return ch;
4284 /* backslash+newline, skip it */
4285 i_getch(input);
4286 }
4287}
4288
Denys Vlasenko657086a2016-09-29 18:07:42 +02004289static int i_peek_and_eat_bkslash_nl(struct in_str *input)
4290{
4291 for (;;) {
4292 int ch, ch2;
4293
4294 ch = i_peek(input);
4295 if (ch != '\\')
4296 return ch;
4297 ch2 = i_peek2(input);
4298 if (ch2 != '\n')
4299 return ch;
4300 /* backslash+newline, skip it */
4301 i_getch(input);
4302 i_getch(input);
4303 }
4304}
4305
Denys Vlasenko0b883582016-12-23 16:49:07 +01004306#if ENABLE_HUSH_TICK || ENABLE_FEATURE_SH_MATH || ENABLE_HUSH_DOLLAR_OPS
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004307/* Subroutines for copying $(...) and `...` things */
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004308static int add_till_backquote(o_string *dest, struct in_str *input, int in_dquote);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004309/* '...' */
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004310static int add_till_single_quote(o_string *dest, struct in_str *input)
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004311{
4312 while (1) {
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00004313 int ch = i_getch(input);
Denis Vlasenko5c090a92009-04-08 21:51:33 +00004314 if (ch == EOF) {
Denis Vlasenkod68ae082009-04-09 20:41:34 +00004315 syntax_error_unterm_ch('\'');
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004316 return 0;
Denis Vlasenko5c090a92009-04-08 21:51:33 +00004317 }
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004318 if (ch == '\'')
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004319 return 1;
Denis Vlasenko82dfec32008-06-16 12:47:11 +00004320 o_addchr(dest, ch);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004321 }
4322}
4323/* "...\"...`..`...." - do we need to handle "...$(..)..." too? */
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004324static int add_till_double_quote(o_string *dest, struct in_str *input)
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004325{
4326 while (1) {
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00004327 int ch = i_getch(input);
Denis Vlasenko5c090a92009-04-08 21:51:33 +00004328 if (ch == EOF) {
Denis Vlasenkod68ae082009-04-09 20:41:34 +00004329 syntax_error_unterm_ch('"');
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004330 return 0;
Denis Vlasenko5c090a92009-04-08 21:51:33 +00004331 }
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004332 if (ch == '"')
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004333 return 1;
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004334 if (ch == '\\') { /* \x. Copy both chars. */
Denis Vlasenko82dfec32008-06-16 12:47:11 +00004335 o_addchr(dest, ch);
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00004336 ch = i_getch(input);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004337 }
Denis Vlasenko82dfec32008-06-16 12:47:11 +00004338 o_addchr(dest, ch);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004339 if (ch == '`') {
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004340 if (!add_till_backquote(dest, input, /*in_dquote:*/ 1))
4341 return 0;
Denis Vlasenko82dfec32008-06-16 12:47:11 +00004342 o_addchr(dest, ch);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004343 continue;
4344 }
Denis Vlasenko5703c222008-06-15 11:49:42 +00004345 //if (ch == '$') ...
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004346 }
4347}
4348/* Process `cmd` - copy contents until "`" is seen. Complicated by
4349 * \` quoting.
4350 * "Within the backquoted style of command substitution, backslash
4351 * shall retain its literal meaning, except when followed by: '$', '`', or '\'.
4352 * The search for the matching backquote shall be satisfied by the first
4353 * backquote found without a preceding backslash; during this search,
4354 * if a non-escaped backquote is encountered within a shell comment,
4355 * a here-document, an embedded command substitution of the $(command)
4356 * form, or a quoted string, undefined results occur. A single-quoted
4357 * or double-quoted string that begins, but does not end, within the
4358 * "`...`" sequence produces undefined results."
4359 * Example Output
4360 * echo `echo '\'TEST\`echo ZZ\`BEST` \TESTZZBEST
4361 */
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004362static int add_till_backquote(o_string *dest, struct in_str *input, int in_dquote)
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004363{
4364 while (1) {
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00004365 int ch = i_getch(input);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004366 if (ch == '`')
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004367 return 1;
Denis Vlasenko5c090a92009-04-08 21:51:33 +00004368 if (ch == '\\') {
Denys Vlasenkoacd5bc82010-09-12 15:05:39 +02004369 /* \x. Copy both unless it is \`, \$, \\ and maybe \" */
4370 ch = i_getch(input);
4371 if (ch != '`'
4372 && ch != '$'
4373 && ch != '\\'
4374 && (!in_dquote || ch != '"')
4375 ) {
4376 o_addchr(dest, '\\');
Denis Vlasenko5c090a92009-04-08 21:51:33 +00004377 }
Denys Vlasenkoacd5bc82010-09-12 15:05:39 +02004378 }
4379 if (ch == EOF) {
4380 syntax_error_unterm_ch('`');
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004381 return 0;
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004382 }
Denis Vlasenko82dfec32008-06-16 12:47:11 +00004383 o_addchr(dest, ch);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004384 }
4385}
4386/* Process $(cmd) - copy contents until ")" is seen. Complicated by
4387 * quoting and nested ()s.
4388 * "With the $(command) style of command substitution, all characters
4389 * following the open parenthesis to the matching closing parenthesis
4390 * constitute the command. Any valid shell script can be used for command,
4391 * except a script consisting solely of redirections which produces
4392 * unspecified results."
4393 * Example Output
4394 * echo $(echo '(TEST)' BEST) (TEST) BEST
4395 * echo $(echo 'TEST)' BEST) TEST) BEST
4396 * echo $(echo \(\(TEST\) BEST) ((TEST) BEST
Denys Vlasenko74369502010-05-21 19:52:01 +02004397 *
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004398 * Also adapted to eat ${var%...} and $((...)) constructs, since ... part
Denys Vlasenkoa6ad3972010-05-22 00:26:06 +02004399 * can contain arbitrary constructs, just like $(cmd).
Denys Vlasenko36f774a2010-09-05 14:45:38 +02004400 * In bash compat mode, it needs to also be able to stop on ':' or '/'
4401 * for ${var:N[:M]} and ${var/P[/R]} parsing.
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004402 */
Denys Vlasenko74369502010-05-21 19:52:01 +02004403#define DOUBLE_CLOSE_CHAR_FLAG 0x80
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004404static int add_till_closing_bracket(o_string *dest, struct in_str *input, unsigned end_ch)
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004405{
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004406 int ch;
Denys Vlasenko74369502010-05-21 19:52:01 +02004407 char dbl = end_ch & DOUBLE_CLOSE_CHAR_FLAG;
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01004408# if BASH_SUBSTR || BASH_PATTERN_SUBST
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004409 char end_char2 = end_ch >> 8;
Denys Vlasenko9297dbc2010-07-05 21:37:12 +02004410# endif
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004411 end_ch &= (DOUBLE_CLOSE_CHAR_FLAG - 1);
4412
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004413 while (1) {
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004414 ch = i_getch(input);
Denis Vlasenko5c090a92009-04-08 21:51:33 +00004415 if (ch == EOF) {
Denys Vlasenkoa6ad3972010-05-22 00:26:06 +02004416 syntax_error_unterm_ch(end_ch);
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004417 return 0;
Denis Vlasenko5c090a92009-04-08 21:51:33 +00004418 }
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01004419 if (ch == end_ch
4420# if BASH_SUBSTR || BASH_PATTERN_SUBST
4421 || ch == end_char2
4422# endif
4423 ) {
Denys Vlasenkoa6ad3972010-05-22 00:26:06 +02004424 if (!dbl)
4425 break;
4426 /* we look for closing )) of $((EXPR)) */
Denys Vlasenko657086a2016-09-29 18:07:42 +02004427 if (i_peek_and_eat_bkslash_nl(input) == end_ch) {
Denys Vlasenkoa6ad3972010-05-22 00:26:06 +02004428 i_getch(input); /* eat second ')' */
4429 break;
Mike Frysinger98c52642009-04-02 10:02:37 +00004430 }
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004431 }
Denis Vlasenko82dfec32008-06-16 12:47:11 +00004432 o_addchr(dest, ch);
Denys Vlasenkoa6ad3972010-05-22 00:26:06 +02004433 if (ch == '(' || ch == '{') {
4434 ch = (ch == '(' ? ')' : '}');
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004435 if (!add_till_closing_bracket(dest, input, ch))
4436 return 0;
Denys Vlasenkoa6ad3972010-05-22 00:26:06 +02004437 o_addchr(dest, ch);
4438 continue;
4439 }
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004440 if (ch == '\'') {
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004441 if (!add_till_single_quote(dest, input))
4442 return 0;
Denis Vlasenko82dfec32008-06-16 12:47:11 +00004443 o_addchr(dest, ch);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004444 continue;
4445 }
4446 if (ch == '"') {
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004447 if (!add_till_double_quote(dest, input))
4448 return 0;
Denis Vlasenko82dfec32008-06-16 12:47:11 +00004449 o_addchr(dest, ch);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004450 continue;
4451 }
Denys Vlasenkoa6ad3972010-05-22 00:26:06 +02004452 if (ch == '`') {
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004453 if (!add_till_backquote(dest, input, /*in_dquote:*/ 0))
4454 return 0;
Denys Vlasenkoa6ad3972010-05-22 00:26:06 +02004455 o_addchr(dest, ch);
4456 continue;
4457 }
Denis Vlasenko5c090a92009-04-08 21:51:33 +00004458 if (ch == '\\') {
4459 /* \x. Copy verbatim. Important for \(, \) */
Denis Vlasenko76db5ad2008-06-12 12:58:20 +00004460 ch = i_getch(input);
Denis Vlasenko5c090a92009-04-08 21:51:33 +00004461 if (ch == EOF) {
Denis Vlasenkod68ae082009-04-09 20:41:34 +00004462 syntax_error_unterm_ch(')');
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004463 return 0;
Denis Vlasenko5c090a92009-04-08 21:51:33 +00004464 }
Denys Vlasenko657086a2016-09-29 18:07:42 +02004465#if 0
4466 if (ch == '\n') {
4467 /* "backslash+newline", ignore both */
4468 o_delchr(dest); /* undo insertion of '\' */
4469 continue;
4470 }
4471#endif
Denis Vlasenko82dfec32008-06-16 12:47:11 +00004472 o_addchr(dest, ch);
Denis Vlasenko76db5ad2008-06-12 12:58:20 +00004473 continue;
4474 }
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004475 }
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004476 return ch;
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004477}
Denys Vlasenko0b883582016-12-23 16:49:07 +01004478#endif /* ENABLE_HUSH_TICK || ENABLE_FEATURE_SH_MATH || ENABLE_HUSH_DOLLAR_OPS */
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004479
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00004480/* Return code: 0 for OK, 1 for syntax error */
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004481#if BB_MMU
Denys Vlasenko101a4e32010-09-09 14:04:57 +02004482#define parse_dollar(as_string, dest, input, quote_mask) \
4483 parse_dollar(dest, input, quote_mask)
Denys Vlasenkoddc62f62010-05-22 00:53:32 +02004484#define as_string NULL
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004485#endif
Denys Vlasenko2e48d532010-05-22 17:30:39 +02004486static int parse_dollar(o_string *as_string,
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004487 o_string *dest,
Denys Vlasenko101a4e32010-09-09 14:04:57 +02004488 struct in_str *input, unsigned char quote_mask)
Eric Andersen25f27032001-04-26 23:22:31 +00004489{
Denys Vlasenko657086a2016-09-29 18:07:42 +02004490 int ch = i_peek_and_eat_bkslash_nl(input); /* first character after the $ */
Denis Vlasenkoe0a33672007-05-10 23:06:55 +00004491
Denys Vlasenko2e48d532010-05-22 17:30:39 +02004492 debug_printf_parse("parse_dollar entered: ch='%c'\n", ch);
Denis Vlasenko1f4cf512007-05-16 10:39:24 +00004493 if (isalpha(ch)) {
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004494 ch = i_getch(input);
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004495 nommu_addchr(as_string, ch);
Denis Vlasenkod4981312008-07-31 10:34:48 +00004496 make_var:
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00004497 o_addchr(dest, SPECIAL_VAR_SYMBOL);
Denis Vlasenkoe0a33672007-05-10 23:06:55 +00004498 while (1) {
Denis Vlasenkoe0a33672007-05-10 23:06:55 +00004499 debug_printf_parse(": '%c'\n", ch);
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00004500 o_addchr(dest, ch | quote_mask);
Denis Vlasenko1f4cf512007-05-16 10:39:24 +00004501 quote_mask = 0;
Denys Vlasenko657086a2016-09-29 18:07:42 +02004502 ch = i_peek_and_eat_bkslash_nl(input);
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02004503 if (!isalnum(ch) && ch != '_') {
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02004504 /* End of variable name reached */
Denis Vlasenko602d13c2007-05-13 18:34:53 +00004505 break;
Denys Vlasenkod17a91d2016-09-29 18:02:37 +02004506 }
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004507 ch = i_getch(input);
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004508 nommu_addchr(as_string, ch);
Eric Andersen25f27032001-04-26 23:22:31 +00004509 }
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00004510 o_addchr(dest, SPECIAL_VAR_SYMBOL);
Eric Andersen25f27032001-04-26 23:22:31 +00004511 } else if (isdigit(ch)) {
Denis Vlasenko602d13c2007-05-13 18:34:53 +00004512 make_one_char_var:
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004513 ch = i_getch(input);
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004514 nommu_addchr(as_string, ch);
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00004515 o_addchr(dest, SPECIAL_VAR_SYMBOL);
Denis Vlasenko602d13c2007-05-13 18:34:53 +00004516 debug_printf_parse(": '%c'\n", ch);
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00004517 o_addchr(dest, ch | quote_mask);
4518 o_addchr(dest, SPECIAL_VAR_SYMBOL);
Eric Andersen25f27032001-04-26 23:22:31 +00004519 } else switch (ch) {
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004520 case '$': /* pid */
4521 case '!': /* last bg pid */
4522 case '?': /* last exit code */
4523 case '#': /* number of args */
4524 case '*': /* args */
4525 case '@': /* args */
4526 goto make_one_char_var;
4527 case '{': {
Denys Vlasenko2093ad22017-07-26 00:07:27 +02004528 char len_single_ch;
4529
Mike Frysingeref3e7fd2009-06-01 14:13:39 -04004530 o_addchr(dest, SPECIAL_VAR_SYMBOL);
4531
Denys Vlasenko74369502010-05-21 19:52:01 +02004532 ch = i_getch(input); /* eat '{' */
4533 nommu_addchr(as_string, ch);
4534
Denys Vlasenko46e64982016-09-29 19:50:55 +02004535 ch = i_getch_and_eat_bkslash_nl(input); /* first char after '{' */
Denys Vlasenko74369502010-05-21 19:52:01 +02004536 /* It should be ${?}, or ${#var},
4537 * or even ${?+subst} - operator acting on a special variable,
4538 * or the beginning of variable name.
4539 */
Denys Vlasenko101a4e32010-09-09 14:04:57 +02004540 if (ch == EOF
4541 || (!strchr(_SPECIAL_VARS_STR, ch) && !isalnum(ch)) /* not one of those */
4542 ) {
Denys Vlasenko74369502010-05-21 19:52:01 +02004543 bad_dollar_syntax:
4544 syntax_error_unterm_str("${name}");
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004545 debug_printf_parse("parse_dollar return 0: unterminated ${name}\n");
4546 return 0;
Denys Vlasenko74369502010-05-21 19:52:01 +02004547 }
Denys Vlasenko101a4e32010-09-09 14:04:57 +02004548 nommu_addchr(as_string, ch);
Denys Vlasenko2093ad22017-07-26 00:07:27 +02004549 len_single_ch = ch;
Denys Vlasenko74369502010-05-21 19:52:01 +02004550 ch |= quote_mask;
4551
Denys Vlasenkoddc62f62010-05-22 00:53:32 +02004552 /* It's possible to just call add_till_closing_bracket() at this point.
Denys Vlasenko74369502010-05-21 19:52:01 +02004553 * However, this regresses some of our testsuite cases
4554 * which check invalid constructs like ${%}.
4555 * Oh well... let's check that the var name part is fine... */
4556
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004557 while (1) {
Denys Vlasenkoddc62f62010-05-22 00:53:32 +02004558 unsigned pos;
4559
Denys Vlasenko74369502010-05-21 19:52:01 +02004560 o_addchr(dest, ch);
4561 debug_printf_parse(": '%c'\n", ch);
4562
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004563 ch = i_getch(input);
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004564 nommu_addchr(as_string, ch);
Denys Vlasenko74369502010-05-21 19:52:01 +02004565 if (ch == '}')
Mike Frysinger98c52642009-04-02 10:02:37 +00004566 break;
Mike Frysinger98c52642009-04-02 10:02:37 +00004567
Denys Vlasenko74369502010-05-21 19:52:01 +02004568 if (!isalnum(ch) && ch != '_') {
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004569 unsigned end_ch;
4570 unsigned char last_ch;
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004571 /* handle parameter expansions
4572 * http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_06_02
4573 */
Denys Vlasenko2093ad22017-07-26 00:07:27 +02004574 if (!strchr(VAR_SUBST_OPS, ch)) { /* ${var<bad_char>... */
4575 if (len_single_ch != '#'
4576 /*|| !strchr(SPECIAL_VARS_STR, ch) - disallow errors like ${#+} ? */
4577 || i_peek(input) != '}'
4578 ) {
4579 goto bad_dollar_syntax;
4580 }
4581 /* else: it's "length of C" ${#C} op,
4582 * where C is a single char
4583 * special var name, e.g. ${#!}.
4584 */
4585 }
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004586 /* Eat everything until closing '}' (or ':') */
4587 end_ch = '}';
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01004588 if (BASH_SUBSTR
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004589 && ch == ':'
Denys Vlasenko36f774a2010-09-05 14:45:38 +02004590 && !strchr(MINUS_PLUS_EQUAL_QUESTION, i_peek(input))
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004591 ) {
4592 /* It's ${var:N[:M]} thing */
4593 end_ch = '}' * 0x100 + ':';
4594 }
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01004595 if (BASH_PATTERN_SUBST
Denys Vlasenko36f774a2010-09-05 14:45:38 +02004596 && ch == '/'
4597 ) {
4598 /* It's ${var/[/]pattern[/repl]} thing */
4599 if (i_peek(input) == '/') { /* ${var//pattern[/repl]}? */
4600 i_getch(input);
4601 nommu_addchr(as_string, '/');
4602 ch = '\\';
4603 }
4604 end_ch = '}' * 0x100 + '/';
4605 }
4606 o_addchr(dest, ch);
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004607 again:
Denys Vlasenkoddc62f62010-05-22 00:53:32 +02004608 if (!BB_MMU)
4609 pos = dest->length;
Denys Vlasenko9297dbc2010-07-05 21:37:12 +02004610#if ENABLE_HUSH_DOLLAR_OPS
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004611 last_ch = add_till_closing_bracket(dest, input, end_ch);
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004612 if (last_ch == 0) /* error? */
4613 return 0;
Denys Vlasenko9297dbc2010-07-05 21:37:12 +02004614#else
4615#error Simple code to only allow ${var} is not implemented
4616#endif
Denys Vlasenkoddc62f62010-05-22 00:53:32 +02004617 if (as_string) {
4618 o_addstr(as_string, dest->data + pos);
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004619 o_addchr(as_string, last_ch);
Denys Vlasenkoddc62f62010-05-22 00:53:32 +02004620 }
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004621
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01004622 if ((BASH_SUBSTR || BASH_PATTERN_SUBST)
4623 && (end_ch & 0xff00)
4624 ) {
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004625 /* close the first block: */
4626 o_addchr(dest, SPECIAL_VAR_SYMBOL);
Denys Vlasenko36f774a2010-09-05 14:45:38 +02004627 /* while parsing N from ${var:N[:M]}
4628 * or pattern from ${var/[/]pattern[/repl]} */
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004629 if ((end_ch & 0xff) == last_ch) {
Denys Vlasenko36f774a2010-09-05 14:45:38 +02004630 /* got ':' or '/'- parse the rest */
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004631 end_ch = '}';
4632 goto again;
4633 }
Denys Vlasenko36f774a2010-09-05 14:45:38 +02004634 /* got '}' */
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01004635 if (BASH_SUBSTR && end_ch == '}' * 0x100 + ':') {
Denys Vlasenko36f774a2010-09-05 14:45:38 +02004636 /* it's ${var:N} - emulate :999999999 */
4637 o_addstr(dest, "999999999");
4638 } /* else: it's ${var/[/]pattern} */
Denys Vlasenko1e811b12010-05-22 03:12:29 +02004639 }
Denys Vlasenko74369502010-05-21 19:52:01 +02004640 break;
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004641 }
Denys Vlasenko2093ad22017-07-26 00:07:27 +02004642 len_single_ch = 0; /* it can't be ${#C} op */
Denys Vlasenko74369502010-05-21 19:52:01 +02004643 }
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004644 o_addchr(dest, SPECIAL_VAR_SYMBOL);
4645 break;
4646 }
Denys Vlasenko0b883582016-12-23 16:49:07 +01004647#if ENABLE_FEATURE_SH_MATH || ENABLE_HUSH_TICK
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004648 case '(': {
Denys Vlasenkoddc62f62010-05-22 00:53:32 +02004649 unsigned pos;
4650
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004651 ch = i_getch(input);
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004652 nommu_addchr(as_string, ch);
Denys Vlasenko0b883582016-12-23 16:49:07 +01004653# if ENABLE_FEATURE_SH_MATH
Denys Vlasenko657086a2016-09-29 18:07:42 +02004654 if (i_peek_and_eat_bkslash_nl(input) == '(') {
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004655 ch = i_getch(input);
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004656 nommu_addchr(as_string, ch);
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004657 o_addchr(dest, SPECIAL_VAR_SYMBOL);
4658 o_addchr(dest, /*quote_mask |*/ '+');
Denys Vlasenkoddc62f62010-05-22 00:53:32 +02004659 if (!BB_MMU)
4660 pos = dest->length;
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004661 if (!add_till_closing_bracket(dest, input, ')' | DOUBLE_CLOSE_CHAR_FLAG))
4662 return 0; /* error */
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00004663 if (as_string) {
4664 o_addstr(as_string, dest->data + pos);
4665 o_addchr(as_string, ')');
4666 o_addchr(as_string, ')');
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00004667 }
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004668 o_addchr(dest, SPECIAL_VAR_SYMBOL);
Eric Andersen25f27032001-04-26 23:22:31 +00004669 break;
Denis Vlasenko76db5ad2008-06-12 12:58:20 +00004670 }
Denis Vlasenkod85a5df2009-04-05 08:43:57 +00004671# endif
4672# if ENABLE_HUSH_TICK
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004673 o_addchr(dest, SPECIAL_VAR_SYMBOL);
4674 o_addchr(dest, quote_mask | '`');
Denys Vlasenkoddc62f62010-05-22 00:53:32 +02004675 if (!BB_MMU)
4676 pos = dest->length;
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004677 if (!add_till_closing_bracket(dest, input, ')'))
4678 return 0; /* error */
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00004679 if (as_string) {
4680 o_addstr(as_string, dest->data + pos);
Denys Vlasenkob70cef72010-01-12 13:45:45 +01004681 o_addchr(as_string, ')');
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00004682 }
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004683 o_addchr(dest, SPECIAL_VAR_SYMBOL);
Denis Vlasenkod85a5df2009-04-05 08:43:57 +00004684# endif
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004685 break;
4686 }
Denis Vlasenkod85a5df2009-04-05 08:43:57 +00004687#endif
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004688 case '_':
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004689 ch = i_getch(input);
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004690 nommu_addchr(as_string, ch);
Denys Vlasenko657086a2016-09-29 18:07:42 +02004691 ch = i_peek_and_eat_bkslash_nl(input);
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004692 if (isalnum(ch)) { /* it's $_name or $_123 */
4693 ch = '_';
4694 goto make_var;
4695 }
4696 /* else: it's $_ */
Denys Vlasenko69b1cef2009-09-21 10:21:44 +02004697 /* TODO: $_ and $-: */
4698 /* $_ Shell or shell script name; or last argument of last command
4699 * (if last command wasn't a pipe; if it was, bash sets $_ to "");
4700 * but in command's env, set to full pathname used to invoke it */
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004701 /* $- Option flags set by set builtin or shell options (-i etc) */
4702 default:
4703 o_addQchr(dest, '$');
Eric Andersen25f27032001-04-26 23:22:31 +00004704 }
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004705 debug_printf_parse("parse_dollar return 1 (ok)\n");
4706 return 1;
Denys Vlasenkoddc62f62010-05-22 00:53:32 +02004707#undef as_string
Eric Andersen25f27032001-04-26 23:22:31 +00004708}
4709
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00004710#if BB_MMU
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01004711# if BASH_PATTERN_SUBST
Denys Vlasenkod98e5c62010-09-10 10:44:23 +02004712#define encode_string(as_string, dest, input, dquote_end, process_bkslash) \
4713 encode_string(dest, input, dquote_end, process_bkslash)
4714# else
4715/* only ${var/pattern/repl} (its pattern part) needs additional mode */
4716#define encode_string(as_string, dest, input, dquote_end, process_bkslash) \
4717 encode_string(dest, input, dquote_end)
4718# endif
Denys Vlasenkoddc62f62010-05-22 00:53:32 +02004719#define as_string NULL
Denys Vlasenkod98e5c62010-09-10 10:44:23 +02004720
4721#else /* !MMU */
4722
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01004723# if BASH_PATTERN_SUBST
Denys Vlasenkod98e5c62010-09-10 10:44:23 +02004724/* all parameters are needed, no macro tricks */
4725# else
4726#define encode_string(as_string, dest, input, dquote_end, process_bkslash) \
4727 encode_string(as_string, dest, input, dquote_end)
4728# endif
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00004729#endif
Denys Vlasenkod98e5c62010-09-10 10:44:23 +02004730static int encode_string(o_string *as_string,
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00004731 o_string *dest,
4732 struct in_str *input,
Denys Vlasenko14e289b2010-09-10 10:15:18 +02004733 int dquote_end,
Denys Vlasenkod98e5c62010-09-10 10:44:23 +02004734 int process_bkslash)
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004735{
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01004736#if !BASH_PATTERN_SUBST
Denys Vlasenkod98e5c62010-09-10 10:44:23 +02004737 const int process_bkslash = 1;
4738#endif
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00004739 int ch;
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004740 int next;
4741
4742 again:
4743 ch = i_getch(input);
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004744 if (ch != EOF)
4745 nommu_addchr(as_string, ch);
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004746 if (ch == dquote_end) { /* may be only '"' or EOF */
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004747 debug_printf_parse("encode_string return 1 (ok)\n");
4748 return 1;
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004749 }
Denis Vlasenko3dfb0352009-04-08 09:29:14 +00004750 /* note: can't move it above ch == dquote_end check! */
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004751 if (ch == EOF) {
Denis Vlasenkod68ae082009-04-09 20:41:34 +00004752 syntax_error_unterm_ch('"');
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004753 return 0; /* error */
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004754 }
4755 next = '\0';
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004756 if (ch != '\n') {
4757 next = i_peek(input);
4758 }
Denys Vlasenkof37eb392009-10-18 11:46:35 +02004759 debug_printf_parse("\" ch=%c (%d) escape=%d\n",
Denys Vlasenko5b686cb2010-09-08 13:44:34 +02004760 ch, ch, !!(dest->o_expflags & EXP_FLAG_ESC_GLOB_CHARS));
Denys Vlasenkod98e5c62010-09-10 10:44:23 +02004761 if (process_bkslash && ch == '\\') {
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004762 if (next == EOF) {
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00004763 syntax_error("\\<eof>");
Denis Vlasenko0b677d82009-04-10 13:49:10 +00004764 xfunc_die();
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004765 }
4766 /* bash:
4767 * "The backslash retains its special meaning [in "..."]
4768 * only when followed by one of the following characters:
4769 * $, `, ", \, or <newline>. A double quote may be quoted
Denys Vlasenkoe640cb42009-05-28 16:49:11 +02004770 * within double quotes by preceding it with a backslash."
Denys Vlasenkod98e5c62010-09-10 10:44:23 +02004771 * NB: in (unquoted) heredoc, above does not apply to ",
4772 * therefore we check for it by "next == dquote_end" cond.
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004773 */
Denys Vlasenkod98e5c62010-09-10 10:44:23 +02004774 if (next == dquote_end || strchr("$`\\\n", next)) {
Denys Vlasenko850b15b2010-09-09 12:58:19 +02004775 ch = i_getch(input); /* eat next */
4776 if (ch == '\n')
4777 goto again; /* skip \<newline> */
Denys Vlasenko4f870492010-09-10 11:06:01 +02004778 } /* else: ch remains == '\\', and we double it below: */
4779 o_addqchr(dest, ch); /* \c if c is a glob char, else just c */
Denys Vlasenko850b15b2010-09-09 12:58:19 +02004780 nommu_addchr(as_string, ch);
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004781 goto again;
4782 }
4783 if (ch == '$') {
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004784 if (!parse_dollar(as_string, dest, input, /*quote_mask:*/ 0x80)) {
4785 debug_printf_parse("encode_string return 0: "
4786 "parse_dollar returned 0 (error)\n");
4787 return 0;
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004788 }
4789 goto again;
4790 }
4791#if ENABLE_HUSH_TICK
4792 if (ch == '`') {
Denys Vlasenkoddc62f62010-05-22 00:53:32 +02004793 //unsigned pos = dest->length;
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004794 o_addchr(dest, SPECIAL_VAR_SYMBOL);
4795 o_addchr(dest, 0x80 | '`');
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004796 if (!add_till_backquote(dest, input, /*in_dquote:*/ dquote_end == '"'))
4797 return 0; /* error */
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004798 o_addchr(dest, SPECIAL_VAR_SYMBOL);
4799 //debug_printf_subst("SUBST RES3 '%s'\n", dest->data + pos);
Denis Vlasenkof328e002009-04-02 16:55:38 +00004800 goto again;
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004801 }
4802#endif
Denis Vlasenkof328e002009-04-02 16:55:38 +00004803 o_addQchr(dest, ch);
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004804 goto again;
Denys Vlasenkoddc62f62010-05-22 00:53:32 +02004805#undef as_string
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004806}
4807
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004808/*
4809 * Scan input until EOF or end_trigger char.
4810 * Return a list of pipes to execute, or NULL on EOF
4811 * or if end_trigger character is met.
Denys Vlasenkocecbc982011-03-30 18:54:52 +02004812 * On syntax error, exit if shell is not interactive,
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004813 * reset parsing machinery and start parsing anew,
4814 * or return ERR_PTR.
Denis Vlasenko027e3fd2009-04-02 22:50:40 +00004815 */
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00004816static struct pipe *parse_stream(char **pstring,
4817 struct in_str *input,
4818 int end_trigger)
Eric Andersen25f27032001-04-26 23:22:31 +00004819{
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004820 struct parse_context ctx;
4821 o_string dest = NULL_O_STRING;
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004822 int heredoc_cnt;
Eric Andersen25f27032001-04-26 23:22:31 +00004823
Denys Vlasenko77a7b552010-09-09 12:40:03 +02004824 /* Single-quote triggers a bypass of the main loop until its mate is
Denys Vlasenko5b686cb2010-09-08 13:44:34 +02004825 * found. When recursing, quote state is passed in via dest->o_expflags.
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004826 */
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004827 debug_printf_parse("parse_stream entered, end_trigger='%c'\n",
Denys Vlasenko90a99042009-09-06 02:36:23 +02004828 end_trigger ? end_trigger : 'X');
Denis Vlasenko0701dca2009-04-11 10:38:47 +00004829 debug_enter();
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00004830
Denys Vlasenkof37eb392009-10-18 11:46:35 +02004831 /* If very first arg is "" or '', dest.data may end up NULL.
4832 * Preventing this: */
4833 o_addchr(&dest, '\0');
4834 dest.length = 0;
4835
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02004836 /* We used to separate words on $IFS here. This was wrong.
4837 * $IFS is used only for word splitting when $var is expanded,
Denys Vlasenko77a7b552010-09-09 12:40:03 +02004838 * here we should use blank chars as separators, not $IFS
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02004839 */
Denys Vlasenko77a7b552010-09-09 12:40:03 +02004840
Denys Vlasenko77a7b552010-09-09 12:40:03 +02004841 if (MAYBE_ASSIGNMENT != 0)
4842 dest.o_assignment = MAYBE_ASSIGNMENT;
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004843 initialize_context(&ctx);
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004844 heredoc_cnt = 0;
Denis Vlasenko1a735862007-05-23 00:32:25 +00004845 while (1) {
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02004846 const char *is_blank;
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00004847 const char *is_special;
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00004848 int ch;
4849 int next;
4850 int redir_fd;
4851 redir_type redir_style;
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00004852
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00004853 ch = i_getch(input);
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00004854 debug_printf_parse(": ch=%c (%d) escape=%d\n",
Denys Vlasenko5b686cb2010-09-08 13:44:34 +02004855 ch, ch, !!(dest.o_expflags & EXP_FLAG_ESC_GLOB_CHARS));
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00004856 if (ch == EOF) {
4857 struct pipe *pi;
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004858
4859 if (heredoc_cnt) {
Denis Vlasenkod68ae082009-04-09 20:41:34 +00004860 syntax_error_unterm_str("here document");
Denys Vlasenkob1cfc452009-05-02 17:18:34 +02004861 goto parse_error;
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004862 }
Denys Vlasenkob1cfc452009-05-02 17:18:34 +02004863 if (end_trigger == ')') {
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01004864 syntax_error_unterm_ch('(');
4865 goto parse_error;
Denys Vlasenkob1cfc452009-05-02 17:18:34 +02004866 }
Denys Vlasenko42246472016-11-07 16:22:35 +01004867 if (end_trigger == '}') {
4868 syntax_error_unterm_ch('{');
4869 goto parse_error;
4870 }
Denys Vlasenkob1cfc452009-05-02 17:18:34 +02004871
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00004872 if (done_word(&dest, &ctx)) {
Denys Vlasenkob1cfc452009-05-02 17:18:34 +02004873 goto parse_error;
Denis Vlasenko55789c62008-06-18 16:30:42 +00004874 }
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00004875 o_free(&dest);
4876 done_pipe(&ctx, PIPE_SEQ);
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00004877 pi = ctx.list_head;
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00004878 /* If we got nothing... */
Denis Vlasenko0b677d82009-04-10 13:49:10 +00004879 /* (this makes bare "&" cmd a no-op.
4880 * bash says: "syntax error near unexpected token '&'") */
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00004881 if (pi->num_cmds == 0
Denys Vlasenko60cb48c2013-01-14 15:57:44 +01004882 IF_HAS_KEYWORDS(&& pi->res_word == RES_NONE)
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00004883 ) {
Denis Vlasenko0701dca2009-04-11 10:38:47 +00004884 free_pipe_list(pi);
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00004885 pi = NULL;
4886 }
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00004887#if !BB_MMU
Denys Vlasenkob5be13c2015-09-04 06:22:10 +02004888 debug_printf_parse("as_string1 '%s'\n", ctx.as_string.data);
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00004889 if (pstring)
4890 *pstring = ctx.as_string.data;
4891 else
4892 o_free_unsafe(&ctx.as_string);
4893#endif
Denis Vlasenko0701dca2009-04-11 10:38:47 +00004894 debug_leave();
4895 debug_printf_parse("parse_stream return %p\n", pi);
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00004896 return pi;
Denis Vlasenko1a735862007-05-23 00:32:25 +00004897 }
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00004898 nommu_addchr(&ctx.as_string, ch);
Denys Vlasenkod8389ad2009-11-16 03:18:46 +01004899
4900 next = '\0';
4901 if (ch != '\n')
4902 next = i_peek(input);
4903
4904 is_special = "{}<>;&|()#'" /* special outside of "str" */
4905 "\\$\"" IF_HUSH_TICK("`"); /* always special */
4906 /* Are { and } special here? */
Denys Vlasenko3227d3f2010-05-17 09:49:47 +02004907 if (ctx.command->argv /* word [word]{... - non-special */
4908 || dest.length /* word{... - non-special */
Denys Vlasenko38292b62010-09-05 14:49:40 +02004909 || dest.has_quoted_part /* ""{... - non-special */
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02004910 || (next != ';' /* }; - special */
4911 && next != ')' /* }) - special */
Denys Vlasenko672a55e2016-11-04 18:46:14 +01004912 && next != '(' /* {( - special */
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02004913 && next != '&' /* }& and }&& ... - special */
4914 && next != '|' /* }|| ... - special */
4915 && !strchr(defifs, next) /* {word - non-special */
Denys Vlasenko3227d3f2010-05-17 09:49:47 +02004916 )
Denys Vlasenkod8389ad2009-11-16 03:18:46 +01004917 ) {
4918 /* They are not special, skip "{}" */
4919 is_special += 2;
4920 }
4921 is_special = strchr(is_special, ch);
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02004922 is_blank = strchr(defifs, ch);
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00004923
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02004924 if (!is_special && !is_blank) { /* ordinary char */
Denis Vlasenkobf25fbc2009-04-19 13:57:51 +00004925 ordinary_char:
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004926 o_addQchr(&dest, ch);
4927 if ((dest.o_assignment == MAYBE_ASSIGNMENT
4928 || dest.o_assignment == WORD_IS_KEYWORD)
Denis Vlasenko55789c62008-06-18 16:30:42 +00004929 && ch == '='
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00004930 && is_well_formed_var_name(dest.data, '=')
Denis Vlasenko55789c62008-06-18 16:30:42 +00004931 ) {
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004932 dest.o_assignment = DEFINITELY_ASSIGNMENT;
Denys Vlasenko29f9b722011-05-14 11:27:36 +02004933 debug_printf_parse("dest.o_assignment='%s'\n", assignment_flag[dest.o_assignment]);
Denis Vlasenko55789c62008-06-18 16:30:42 +00004934 }
Denis Vlasenkobb81c582007-01-30 22:32:09 +00004935 continue;
4936 }
Denis Vlasenko240c2552009-04-03 03:45:05 +00004937
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02004938 if (is_blank) {
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004939 if (done_word(&dest, &ctx)) {
4940 goto parse_error;
Eric Andersenaac75e52001-04-30 18:18:45 +00004941 }
Denis Vlasenko37181682009-04-03 03:19:15 +00004942 if (ch == '\n') {
Denys Vlasenko7b4c0fd2010-11-22 17:58:14 +01004943 /* Is this a case when newline is simply ignored?
4944 * Some examples:
4945 * "cmd | <newline> cmd ..."
4946 * "case ... in <newline> word) ..."
4947 */
4948 if (IS_NULL_CMD(ctx.command)
4949 && dest.length == 0 && !dest.has_quoted_part
Denis Vlasenkof1736072008-07-31 10:09:26 +00004950 ) {
Denys Vlasenko642e71a2011-01-07 15:16:05 +01004951 /* This newline can be ignored. But...
Denys Vlasenko98c46d12011-01-18 17:30:07 +01004952 * Without check #1, interactive shell
4953 * ignores even bare <newline>,
4954 * and shows the continuation prompt:
Denys Vlasenko642e71a2011-01-07 15:16:05 +01004955 * ps1_prompt$ <enter>
Denys Vlasenko98c46d12011-01-18 17:30:07 +01004956 * ps2> _ <=== wrong, should be ps1
4957 * Without check #2, "cmd & <newline>"
4958 * is similarly mistreated.
4959 * (BTW, this makes "cmd & cmd"
4960 * and "cmd && cmd" non-orthogonal.
4961 * Really, ask yourself, why
4962 * "cmd && <newline>" doesn't start
4963 * cmd but waits for more input?
Denys Vlasenkob24e55d2017-07-16 20:29:35 +02004964 * The only reason is that it might be
4965 * a "cmd1 && <nl> cmd2 &" construct,
4966 * cmd1 may need to run in BG).
Denys Vlasenko642e71a2011-01-07 15:16:05 +01004967 */
4968 struct pipe *pi = ctx.list_head;
Denys Vlasenko98c46d12011-01-18 17:30:07 +01004969 if (pi->num_cmds != 0 /* check #1 */
4970 && pi->followup != PIPE_BG /* check #2 */
4971 ) {
Denys Vlasenko642e71a2011-01-07 15:16:05 +01004972 continue;
Denys Vlasenko98c46d12011-01-18 17:30:07 +01004973 }
Denis Vlasenkof1736072008-07-31 10:09:26 +00004974 }
Denis Vlasenko240c2552009-04-03 03:45:05 +00004975 /* Treat newline as a command separator. */
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004976 done_pipe(&ctx, PIPE_SEQ);
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004977 debug_printf_parse("heredoc_cnt:%d\n", heredoc_cnt);
4978 if (heredoc_cnt) {
Denis Vlasenko3dfb0352009-04-08 09:29:14 +00004979 if (fetch_heredocs(heredoc_cnt, &ctx, input)) {
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004980 goto parse_error;
Denis Vlasenko3dfb0352009-04-08 09:29:14 +00004981 }
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00004982 heredoc_cnt = 0;
4983 }
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004984 dest.o_assignment = MAYBE_ASSIGNMENT;
Denys Vlasenko29f9b722011-05-14 11:27:36 +02004985 debug_printf_parse("dest.o_assignment='%s'\n", assignment_flag[dest.o_assignment]);
Denis Vlasenko240c2552009-04-03 03:45:05 +00004986 ch = ';';
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02004987 /* note: if (is_blank) continue;
Denis Vlasenko240c2552009-04-03 03:45:05 +00004988 * will still trigger for us */
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00004989 }
Denis Vlasenkobb81c582007-01-30 22:32:09 +00004990 }
Denis Vlasenko9f8d9382009-04-19 14:03:11 +00004991
4992 /* "cmd}" or "cmd }..." without semicolon or &:
4993 * } is an ordinary char in this case, even inside { cmd; }
4994 * Pathological example: { ""}; } should exec "}" cmd
4995 */
Denis Vlasenkodcd78c42009-04-19 23:07:51 +00004996 if (ch == '}') {
Denys Vlasenko672a55e2016-11-04 18:46:14 +01004997 if (dest.length != 0 /* word} */
Denys Vlasenko38292b62010-09-05 14:49:40 +02004998 || dest.has_quoted_part /* ""} */
Denis Vlasenkodcd78c42009-04-19 23:07:51 +00004999 ) {
5000 goto ordinary_char;
5001 }
Denys Vlasenko672a55e2016-11-04 18:46:14 +01005002 if (!IS_NULL_CMD(ctx.command)) { /* cmd } */
5003 /* Generally, there should be semicolon: "cmd; }"
5004 * However, bash allows to omit it if "cmd" is
5005 * a group. Examples:
5006 * { { echo 1; } }
5007 * {(echo 1)}
5008 * { echo 0 >&2 | { echo 1; } }
5009 * { while false; do :; done }
5010 * { case a in b) ;; esac }
5011 */
5012 if (ctx.command->group)
5013 goto term_group;
5014 goto ordinary_char;
5015 }
Denis Vlasenkodcd78c42009-04-19 23:07:51 +00005016 if (!IS_NULL_PIPE(ctx.pipe)) /* cmd | } */
Denys Vlasenko672a55e2016-11-04 18:46:14 +01005017 /* Can't be an end of {cmd}, skip the check */
Denis Vlasenkodcd78c42009-04-19 23:07:51 +00005018 goto skip_end_trigger;
5019 /* else: } does terminate a group */
Denis Vlasenko9f8d9382009-04-19 14:03:11 +00005020 }
Denys Vlasenko672a55e2016-11-04 18:46:14 +01005021 term_group:
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00005022 if (end_trigger && end_trigger == ch
Denys Vlasenkoe9bda902009-05-23 16:50:07 +02005023 && (ch != ';' || heredoc_cnt == 0)
5024#if ENABLE_HUSH_CASE
5025 && (ch != ')'
5026 || ctx.ctx_res_w != RES_MATCH
Denys Vlasenko38292b62010-09-05 14:49:40 +02005027 || (!dest.has_quoted_part && strcmp(dest.data, "esac") == 0)
Denys Vlasenkoe9bda902009-05-23 16:50:07 +02005028 )
5029#endif
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00005030 ) {
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00005031 if (heredoc_cnt) {
5032 /* This is technically valid:
5033 * { cat <<HERE; }; echo Ok
5034 * heredoc
5035 * heredoc
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00005036 * HERE
5037 * but we don't support this.
5038 * We require heredoc to be in enclosing {}/(),
5039 * if any.
5040 */
Denis Vlasenkod68ae082009-04-09 20:41:34 +00005041 syntax_error_unterm_str("here document");
Denis Vlasenko6c9be7f2009-04-07 02:29:51 +00005042 goto parse_error;
5043 }
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005044 if (done_word(&dest, &ctx)) {
5045 goto parse_error;
5046 }
5047 done_pipe(&ctx, PIPE_SEQ);
5048 dest.o_assignment = MAYBE_ASSIGNMENT;
Denys Vlasenko29f9b722011-05-14 11:27:36 +02005049 debug_printf_parse("dest.o_assignment='%s'\n", assignment_flag[dest.o_assignment]);
Denis Vlasenko240c2552009-04-03 03:45:05 +00005050 /* Do we sit outside of any if's, loops or case's? */
Denis Vlasenko37181682009-04-03 03:19:15 +00005051 if (!HAS_KEYWORDS
Denys Vlasenko60cb48c2013-01-14 15:57:44 +01005052 IF_HAS_KEYWORDS(|| (ctx.ctx_res_w == RES_NONE && ctx.old_flag == 0))
Denis Vlasenko37181682009-04-03 03:19:15 +00005053 ) {
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005054 o_free(&dest);
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00005055#if !BB_MMU
Denys Vlasenkob5be13c2015-09-04 06:22:10 +02005056 debug_printf_parse("as_string2 '%s'\n", ctx.as_string.data);
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00005057 if (pstring)
5058 *pstring = ctx.as_string.data;
5059 else
5060 o_free_unsafe(&ctx.as_string);
5061#endif
Denys Vlasenko39701202017-08-02 19:44:05 +02005062 if (ch != ';' && IS_NULL_PIPE(ctx.list_head)) {
5063 /* Example: bare "{ }", "()" */
5064 G.last_exitcode = 2; /* bash compat */
5065 syntax_error_unexpected_ch(ch);
5066 goto parse_error2;
5067 }
Denis Vlasenko0701dca2009-04-11 10:38:47 +00005068 debug_printf_parse("parse_stream return %p: "
5069 "end_trigger char found\n",
5070 ctx.list_head);
Denys Vlasenko39701202017-08-02 19:44:05 +02005071 debug_leave();
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005072 return ctx.list_head;
Denis Vlasenkof8d01d32008-06-14 17:13:20 +00005073 }
Denis Vlasenkobb81c582007-01-30 22:32:09 +00005074 }
Denis Vlasenkodcd78c42009-04-19 23:07:51 +00005075 skip_end_trigger:
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02005076 if (is_blank)
Denis Vlasenkobb81c582007-01-30 22:32:09 +00005077 continue;
Denis Vlasenko55789c62008-06-18 16:30:42 +00005078
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00005079 /* Catch <, > before deciding whether this word is
5080 * an assignment. a=1 2>z b=2: b=2 is still assignment */
5081 switch (ch) {
5082 case '>':
5083 redir_fd = redirect_opt_num(&dest);
5084 if (done_word(&dest, &ctx)) {
5085 goto parse_error;
5086 }
5087 redir_style = REDIRECT_OVERWRITE;
5088 if (next == '>') {
5089 redir_style = REDIRECT_APPEND;
5090 ch = i_getch(input);
5091 nommu_addchr(&ctx.as_string, ch);
5092 }
5093#if 0
5094 else if (next == '(') {
5095 syntax_error(">(process) not supported");
5096 goto parse_error;
5097 }
5098#endif
5099 if (parse_redirect(&ctx, redir_fd, redir_style, input))
5100 goto parse_error;
5101 continue; /* back to top of while (1) */
5102 case '<':
5103 redir_fd = redirect_opt_num(&dest);
5104 if (done_word(&dest, &ctx)) {
5105 goto parse_error;
5106 }
5107 redir_style = REDIRECT_INPUT;
5108 if (next == '<') {
5109 redir_style = REDIRECT_HEREDOC;
5110 heredoc_cnt++;
5111 debug_printf_parse("++heredoc_cnt=%d\n", heredoc_cnt);
5112 ch = i_getch(input);
5113 nommu_addchr(&ctx.as_string, ch);
5114 } else if (next == '>') {
5115 redir_style = REDIRECT_IO;
5116 ch = i_getch(input);
5117 nommu_addchr(&ctx.as_string, ch);
5118 }
5119#if 0
5120 else if (next == '(') {
5121 syntax_error("<(process) not supported");
5122 goto parse_error;
5123 }
5124#endif
5125 if (parse_redirect(&ctx, redir_fd, redir_style, input))
5126 goto parse_error;
5127 continue; /* back to top of while (1) */
Denys Vlasenko7b4c0fd2010-11-22 17:58:14 +01005128 case '#':
5129 if (dest.length == 0 && !dest.has_quoted_part) {
5130 /* skip "#comment" */
5131 while (1) {
5132 ch = i_peek(input);
5133 if (ch == EOF || ch == '\n')
5134 break;
5135 i_getch(input);
5136 /* note: we do not add it to &ctx.as_string */
5137 }
5138 nommu_addchr(&ctx.as_string, '\n');
5139 continue; /* back to top of while (1) */
5140 }
5141 break;
5142 case '\\':
5143 if (next == '\n') {
5144 /* It's "\<newline>" */
5145#if !BB_MMU
5146 /* Remove trailing '\' from ctx.as_string */
5147 ctx.as_string.data[--ctx.as_string.length] = '\0';
5148#endif
5149 ch = i_getch(input); /* eat it */
5150 continue; /* back to top of while (1) */
5151 }
5152 break;
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00005153 }
5154
5155 if (dest.o_assignment == MAYBE_ASSIGNMENT
5156 /* check that we are not in word in "a=1 2>word b=1": */
5157 && !ctx.pending_redirect
5158 ) {
5159 /* ch is a special char and thus this word
5160 * cannot be an assignment */
5161 dest.o_assignment = NOT_ASSIGNMENT;
Denys Vlasenko29f9b722011-05-14 11:27:36 +02005162 debug_printf_parse("dest.o_assignment='%s'\n", assignment_flag[dest.o_assignment]);
Denis Vlasenkoc96865f2009-04-10 00:20:58 +00005163 }
5164
Denys Vlasenkocbfe6ad2009-08-12 19:47:44 +02005165 /* Note: nommu_addchr(&ctx.as_string, ch) is already done */
5166
Denis Vlasenkobb81c582007-01-30 22:32:09 +00005167 switch (ch) {
Denys Vlasenko7b4c0fd2010-11-22 17:58:14 +01005168 case '#': /* non-comment #: "echo a#b" etc */
5169 o_addQchr(&dest, ch);
Eric Andersen25f27032001-04-26 23:22:31 +00005170 break;
5171 case '\\':
5172 if (next == EOF) {
Denis Vlasenko05d3b7c2009-04-09 19:16:15 +00005173 syntax_error("\\<eof>");
Denis Vlasenko0b677d82009-04-10 13:49:10 +00005174 xfunc_die();
Eric Andersen25f27032001-04-26 23:22:31 +00005175 }
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00005176 ch = i_getch(input);
Denys Vlasenko7b4c0fd2010-11-22 17:58:14 +01005177 /* note: ch != '\n' (that case does not reach this place) */
5178 o_addchr(&dest, '\\');
5179 /*nommu_addchr(&ctx.as_string, '\\'); - already done */
5180 o_addchr(&dest, ch);
5181 nommu_addchr(&ctx.as_string, ch);
5182 /* Example: echo Hello \2>file
5183 * we need to know that word 2 is quoted */
5184 dest.has_quoted_part = 1;
Eric Andersen25f27032001-04-26 23:22:31 +00005185 break;
5186 case '$':
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01005187 if (!parse_dollar(&ctx.as_string, &dest, input, /*quote_mask:*/ 0)) {
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00005188 debug_printf_parse("parse_stream parse error: "
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01005189 "parse_dollar returned 0 (error)\n");
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005190 goto parse_error;
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00005191 }
Eric Andersen25f27032001-04-26 23:22:31 +00005192 break;
5193 case '\'':
Denys Vlasenko38292b62010-09-05 14:49:40 +02005194 dest.has_quoted_part = 1;
Denys Vlasenko6e42b892011-08-01 18:16:43 +02005195 if (next == '\'' && !ctx.pending_redirect) {
5196 insert_empty_quoted_str_marker:
5197 nommu_addchr(&ctx.as_string, next);
5198 i_getch(input); /* eat second ' */
5199 o_addchr(&dest, SPECIAL_VAR_SYMBOL);
5200 o_addchr(&dest, SPECIAL_VAR_SYMBOL);
5201 } else {
5202 while (1) {
5203 ch = i_getch(input);
5204 if (ch == EOF) {
5205 syntax_error_unterm_ch('\'');
5206 goto parse_error;
5207 }
5208 nommu_addchr(&ctx.as_string, ch);
5209 if (ch == '\'')
5210 break;
5211 o_addqchr(&dest, ch);
Denis Vlasenkof8d01d32008-06-14 17:13:20 +00005212 }
Eric Andersen25f27032001-04-26 23:22:31 +00005213 }
Eric Andersen25f27032001-04-26 23:22:31 +00005214 break;
5215 case '"':
Denys Vlasenko38292b62010-09-05 14:49:40 +02005216 dest.has_quoted_part = 1;
Denys Vlasenko6e42b892011-08-01 18:16:43 +02005217 if (next == '"' && !ctx.pending_redirect)
5218 goto insert_empty_quoted_str_marker;
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005219 if (dest.o_assignment == NOT_ASSIGNMENT)
Denys Vlasenko5b6210c2010-09-09 13:32:21 +02005220 dest.o_expflags |= EXP_FLAG_ESC_GLOB_CHARS;
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01005221 if (!encode_string(&ctx.as_string, &dest, input, '"', /*process_bkslash:*/ 1))
Denys Vlasenko77a7b552010-09-09 12:40:03 +02005222 goto parse_error;
Denys Vlasenko5b6210c2010-09-09 13:32:21 +02005223 dest.o_expflags &= ~EXP_FLAG_ESC_GLOB_CHARS;
Eric Andersen25f27032001-04-26 23:22:31 +00005224 break;
Denis Vlasenko14b5dd92007-05-20 21:51:38 +00005225#if ENABLE_HUSH_TICK
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00005226 case '`': {
Denys Vlasenko60a94142011-05-13 20:57:01 +02005227 USE_FOR_NOMMU(unsigned pos;)
Denys Vlasenko2e48d532010-05-22 17:30:39 +02005228
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005229 o_addchr(&dest, SPECIAL_VAR_SYMBOL);
5230 o_addchr(&dest, '`');
Denys Vlasenko60a94142011-05-13 20:57:01 +02005231 USE_FOR_NOMMU(pos = dest.length;)
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01005232 if (!add_till_backquote(&dest, input, /*in_dquote:*/ 0))
5233 goto parse_error;
Denys Vlasenko2e48d532010-05-22 17:30:39 +02005234# if !BB_MMU
Denis Vlasenko5c090a92009-04-08 21:51:33 +00005235 o_addstr(&ctx.as_string, dest.data + pos);
5236 o_addchr(&ctx.as_string, '`');
Denys Vlasenko2e48d532010-05-22 17:30:39 +02005237# endif
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005238 o_addchr(&dest, SPECIAL_VAR_SYMBOL);
5239 //debug_printf_subst("SUBST RES3 '%s'\n", dest.data + pos);
Eric Andersen25f27032001-04-26 23:22:31 +00005240 break;
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00005241 }
Denis Vlasenko14b5dd92007-05-20 21:51:38 +00005242#endif
Eric Andersen25f27032001-04-26 23:22:31 +00005243 case ';':
Denis Vlasenko17f02e72008-07-14 04:32:29 +00005244#if ENABLE_HUSH_CASE
5245 case_semi:
5246#endif
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005247 if (done_word(&dest, &ctx)) {
5248 goto parse_error;
5249 }
5250 done_pipe(&ctx, PIPE_SEQ);
Denis Vlasenko17f02e72008-07-14 04:32:29 +00005251#if ENABLE_HUSH_CASE
5252 /* Eat multiple semicolons, detect
5253 * whether it means something special */
5254 while (1) {
5255 ch = i_peek(input);
5256 if (ch != ';')
5257 break;
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00005258 ch = i_getch(input);
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00005259 nommu_addchr(&ctx.as_string, ch);
Denys Vlasenkoe9bda902009-05-23 16:50:07 +02005260 if (ctx.ctx_res_w == RES_CASE_BODY) {
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005261 ctx.ctx_dsemicolon = 1;
5262 ctx.ctx_res_w = RES_MATCH;
Denis Vlasenko17f02e72008-07-14 04:32:29 +00005263 break;
5264 }
5265 }
5266#endif
Denis Vlasenko2b576b82008-08-04 00:46:07 +00005267 new_cmd:
5268 /* We just finished a cmd. New one may start
5269 * with an assignment */
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005270 dest.o_assignment = MAYBE_ASSIGNMENT;
Denys Vlasenko29f9b722011-05-14 11:27:36 +02005271 debug_printf_parse("dest.o_assignment='%s'\n", assignment_flag[dest.o_assignment]);
Eric Andersen25f27032001-04-26 23:22:31 +00005272 break;
5273 case '&':
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005274 if (done_word(&dest, &ctx)) {
5275 goto parse_error;
5276 }
Denis Vlasenkobb81c582007-01-30 22:32:09 +00005277 if (next == '&') {
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00005278 ch = i_getch(input);
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00005279 nommu_addchr(&ctx.as_string, ch);
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005280 done_pipe(&ctx, PIPE_AND);
Eric Andersen25f27032001-04-26 23:22:31 +00005281 } else {
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005282 done_pipe(&ctx, PIPE_BG);
Eric Andersen25f27032001-04-26 23:22:31 +00005283 }
Denis Vlasenko2b576b82008-08-04 00:46:07 +00005284 goto new_cmd;
Eric Andersen25f27032001-04-26 23:22:31 +00005285 case '|':
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005286 if (done_word(&dest, &ctx)) {
5287 goto parse_error;
5288 }
Denis Vlasenkofbeeb322008-07-31 00:17:01 +00005289#if ENABLE_HUSH_CASE
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005290 if (ctx.ctx_res_w == RES_MATCH)
Denis Vlasenkof1736072008-07-31 10:09:26 +00005291 break; /* we are in case's "word | word)" */
Denis Vlasenkofbeeb322008-07-31 00:17:01 +00005292#endif
Denis Vlasenko2b576b82008-08-04 00:46:07 +00005293 if (next == '|') { /* || */
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00005294 ch = i_getch(input);
Denis Vlasenkoaf07b7c2009-04-07 13:26:18 +00005295 nommu_addchr(&ctx.as_string, ch);
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005296 done_pipe(&ctx, PIPE_OR);
Eric Andersen25f27032001-04-26 23:22:31 +00005297 } else {
5298 /* we could pick up a file descriptor choice here
5299 * with redirect_opt_num(), but bash doesn't do it.
5300 * "echo foo 2| cat" yields "foo 2". */
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005301 done_command(&ctx);
Eric Andersen25f27032001-04-26 23:22:31 +00005302 }
Denis Vlasenko2b576b82008-08-04 00:46:07 +00005303 goto new_cmd;
Eric Andersen25f27032001-04-26 23:22:31 +00005304 case '(':
Denis Vlasenko17f02e72008-07-14 04:32:29 +00005305#if ENABLE_HUSH_CASE
Denis Vlasenkof1736072008-07-31 10:09:26 +00005306 /* "case... in [(]word)..." - skip '(' */
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005307 if (ctx.ctx_res_w == RES_MATCH
5308 && ctx.command->argv == NULL /* not (word|(... */
5309 && dest.length == 0 /* not word(... */
Denys Vlasenko38292b62010-09-05 14:49:40 +02005310 && dest.has_quoted_part == 0 /* not ""(... */
Denis Vlasenko17f02e72008-07-14 04:32:29 +00005311 ) {
5312 continue;
5313 }
5314#endif
Eric Andersen25f27032001-04-26 23:22:31 +00005315 case '{':
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005316 if (parse_group(&dest, &ctx, input, ch) != 0) {
5317 goto parse_error;
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00005318 }
Denis Vlasenko2b576b82008-08-04 00:46:07 +00005319 goto new_cmd;
Eric Andersen25f27032001-04-26 23:22:31 +00005320 case ')':
Denis Vlasenko17f02e72008-07-14 04:32:29 +00005321#if ENABLE_HUSH_CASE
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005322 if (ctx.ctx_res_w == RES_MATCH)
Denis Vlasenko17f02e72008-07-14 04:32:29 +00005323 goto case_semi;
5324#endif
Eric Andersen25f27032001-04-26 23:22:31 +00005325 case '}':
Denis Vlasenkoc3735272008-10-09 12:58:26 +00005326 /* proper use of this character is caught by end_trigger:
5327 * if we see {, we call parse_group(..., end_trigger='}')
5328 * and it will match } earlier (not here). */
Denys Vlasenkob05bcaf2017-01-03 11:47:50 +01005329 G.last_exitcode = 2;
Denys Vlasenko39701202017-08-02 19:44:05 +02005330 syntax_error_unexpected_ch(ch);
Denys Vlasenko9fda6092017-07-14 13:36:48 +02005331 goto parse_error2;
Eric Andersen25f27032001-04-26 23:22:31 +00005332 default:
Denis Vlasenko5ec61322008-06-24 00:50:07 +00005333 if (HUSH_DEBUG)
Denis Vlasenko90e485c2007-05-23 15:22:50 +00005334 bb_error_msg_and_die("BUG: unexpected %c\n", ch);
Eric Andersen25f27032001-04-26 23:22:31 +00005335 }
Denis Vlasenkof8d01d32008-06-14 17:13:20 +00005336 } /* while (1) */
Denis Vlasenko027e3fd2009-04-02 22:50:40 +00005337
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005338 parse_error:
Denys Vlasenkob05bcaf2017-01-03 11:47:50 +01005339 G.last_exitcode = 1;
Denys Vlasenko9fda6092017-07-14 13:36:48 +02005340 parse_error2:
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005341 {
Denis Vlasenko60b392f2009-04-03 19:14:32 +00005342 struct parse_context *pctx;
5343 IF_HAS_KEYWORDS(struct parse_context *p2;)
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005344
5345 /* Clean up allocated tree.
Denys Vlasenko764b2f02009-06-07 16:05:04 +02005346 * Sample for finding leaks on syntax error recovery path.
5347 * Run it from interactive shell, watch pmap `pidof hush`.
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005348 * while if false; then false; fi; do break; fi
Denis Vlasenkocc4c6932009-04-05 07:38:48 +00005349 * Samples to catch leaks at execution:
Denys Vlasenko5d5a6112016-11-07 19:36:50 +01005350 * while if (true | { true;}); then echo ok; fi; do break; done
5351 * 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 +00005352 */
5353 pctx = &ctx;
5354 do {
5355 /* Update pipe/command counts,
5356 * otherwise freeing may miss some */
5357 done_pipe(pctx, PIPE_SEQ);
5358 debug_printf_clean("freeing list %p from ctx %p\n",
5359 pctx->list_head, pctx);
5360 debug_print_tree(pctx->list_head, 0);
Denis Vlasenko0701dca2009-04-11 10:38:47 +00005361 free_pipe_list(pctx->list_head);
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005362 debug_printf_clean("freed list %p\n", pctx->list_head);
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00005363#if !BB_MMU
5364 o_free_unsafe(&pctx->as_string);
5365#endif
Denis Vlasenko60b392f2009-04-03 19:14:32 +00005366 IF_HAS_KEYWORDS(p2 = pctx->stack;)
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005367 if (pctx != &ctx) {
5368 free(pctx);
5369 }
Denis Vlasenko60b392f2009-04-03 19:14:32 +00005370 IF_HAS_KEYWORDS(pctx = p2;)
5371 } while (HAS_KEYWORDS && pctx);
Denys Vlasenkocecbc982011-03-30 18:54:52 +02005372
Denys Vlasenkoa439fa92011-03-30 19:11:46 +02005373 o_free(&dest);
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00005374#if !BB_MMU
Denys Vlasenkocecbc982011-03-30 18:54:52 +02005375 if (pstring)
5376 *pstring = NULL;
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00005377#endif
Denys Vlasenkocecbc982011-03-30 18:54:52 +02005378 debug_leave();
5379 return ERR_PTR;
Denis Vlasenko027e3fd2009-04-02 22:50:40 +00005380 }
Eric Andersen25f27032001-04-26 23:22:31 +00005381}
5382
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005383
5384/*** Execution routines ***/
5385
5386/* Expansion can recurse, need forward decls: */
Denys Vlasenko637982f2017-07-06 01:52:23 +02005387#if !BASH_PATTERN_SUBST && !ENABLE_HUSH_CASE
Denys Vlasenkod98e5c62010-09-10 10:44:23 +02005388/* only ${var/pattern/repl} (its pattern part) needs additional mode */
5389#define expand_string_to_string(str, do_unbackslash) \
5390 expand_string_to_string(str)
5391#endif
Denys Vlasenkoebee4102010-09-10 10:17:53 +02005392static char *expand_string_to_string(const char *str, int do_unbackslash);
Denys Vlasenko26777aa2010-11-22 23:49:10 +01005393#if ENABLE_HUSH_TICK
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005394static int process_command_subs(o_string *dest, const char *s);
Denys Vlasenko26777aa2010-11-22 23:49:10 +01005395#endif
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005396
5397/* expand_strvec_to_strvec() takes a list of strings, expands
5398 * all variable references within and returns a pointer to
5399 * a list of expanded strings, possibly with larger number
5400 * of strings. (Think VAR="a b"; echo $VAR).
5401 * This new list is allocated as a single malloc block.
5402 * NULL-terminated list of char* pointers is at the beginning of it,
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02005403 * followed by strings themselves.
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005404 * Caller can deallocate entire list by single free(list). */
5405
Denys Vlasenko238081f2010-10-03 14:26:26 +02005406/* A horde of its helpers come first: */
5407
5408static void o_addblock_duplicate_backslash(o_string *o, const char *str, int len)
5409{
5410 while (--len >= 0) {
Denys Vlasenko9e800222010-10-03 14:28:04 +02005411 char c = *str++;
Denys Vlasenko957f79f2010-10-03 17:15:50 +02005412
Denys Vlasenko9e800222010-10-03 14:28:04 +02005413#if ENABLE_HUSH_BRACE_EXPANSION
5414 if (c == '{' || c == '}') {
5415 /* { -> \{, } -> \} */
5416 o_addchr(o, '\\');
Denys Vlasenko957f79f2010-10-03 17:15:50 +02005417 /* And now we want to add { or } and continue:
5418 * o_addchr(o, c);
5419 * continue;
Denys Vlasenko10ad6222017-04-17 16:13:32 +02005420 * luckily, just falling through achieves this.
Denys Vlasenko957f79f2010-10-03 17:15:50 +02005421 */
Denys Vlasenko9e800222010-10-03 14:28:04 +02005422 }
5423#endif
5424 o_addchr(o, c);
5425 if (c == '\\') {
Denys Vlasenko238081f2010-10-03 14:26:26 +02005426 /* \z -> \\\z; \<eol> -> \\<eol> */
5427 o_addchr(o, '\\');
5428 if (len) {
5429 len--;
5430 o_addchr(o, '\\');
5431 o_addchr(o, *str++);
5432 }
5433 }
5434 }
5435}
5436
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005437/* Store given string, finalizing the word and starting new one whenever
5438 * we encounter IFS char(s). This is used for expanding variable values.
Denys Vlasenko6e42b892011-08-01 18:16:43 +02005439 * End-of-string does NOT finalize word: think about 'echo -$VAR-'.
5440 * Return in *ended_with_ifs:
5441 * 1 - ended with IFS char, else 0 (this includes case of empty str).
5442 */
5443static int expand_on_ifs(int *ended_with_ifs, o_string *output, int n, const char *str)
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005444{
Denys Vlasenko6e42b892011-08-01 18:16:43 +02005445 int last_is_ifs = 0;
5446
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005447 while (1) {
Denys Vlasenko4fb53fb2011-08-01 14:06:20 +02005448 int word_len;
5449
5450 if (!*str) /* EOL - do not finalize word */
5451 break;
5452 word_len = strcspn(str, G.ifs);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005453 if (word_len) {
Denys Vlasenko4fb53fb2011-08-01 14:06:20 +02005454 /* We have WORD_LEN leading non-IFS chars */
Denys Vlasenko238081f2010-10-03 14:26:26 +02005455 if (!(output->o_expflags & EXP_FLAG_GLOB)) {
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02005456 o_addblock(output, str, word_len);
Denys Vlasenko238081f2010-10-03 14:26:26 +02005457 } else {
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02005458 /* Protect backslashes against globbing up :)
Denys Vlasenkoa769e022010-09-10 10:12:34 +02005459 * Example: "v='\*'; echo b$v" prints "b\*"
5460 * (and does not try to glob on "*")
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02005461 */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005462 o_addblock_duplicate_backslash(output, str, word_len);
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02005463 /*/ Why can't we do it easier? */
5464 /*o_addblock(output, str, word_len); - WRONG: "v='\*'; echo Z$v" prints "Z*" instead of "Z\*" */
5465 /*o_addqblock(output, str, word_len); - WRONG: "v='*'; echo Z$v" prints "Z*" instead of Z* files */
5466 }
Denys Vlasenko6e42b892011-08-01 18:16:43 +02005467 last_is_ifs = 0;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005468 str += word_len;
Denys Vlasenko4fb53fb2011-08-01 14:06:20 +02005469 if (!*str) /* EOL - do not finalize word */
5470 break;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005471 }
Denys Vlasenko6e42b892011-08-01 18:16:43 +02005472
5473 /* We know str here points to at least one IFS char */
5474 last_is_ifs = 1;
5475 str += strspn(str, G.ifs); /* skip IFS chars */
5476 if (!*str) /* EOL - do not finalize word */
5477 break;
5478
5479 /* Start new word... but not always! */
5480 /* Case "v=' a'; echo ''$v": we do need to finalize empty word: */
Denys Vlasenko4fb53fb2011-08-01 14:06:20 +02005481 if (output->has_quoted_part
5482 /* Case "v=' a'; echo $v":
5483 * here nothing precedes the space in $v expansion,
5484 * therefore we should not finish the word
Denys Vlasenko6e42b892011-08-01 18:16:43 +02005485 * (IOW: if there *is* word to finalize, only then do it):
Denys Vlasenko4fb53fb2011-08-01 14:06:20 +02005486 */
Denys Vlasenko6e42b892011-08-01 18:16:43 +02005487 || (n > 0 && output->data[output->length - 1])
Denys Vlasenko4fb53fb2011-08-01 14:06:20 +02005488 ) {
Denys Vlasenko4fb53fb2011-08-01 14:06:20 +02005489 o_addchr(output, '\0');
5490 debug_print_list("expand_on_ifs", output, n);
5491 n = o_save_ptr(output, n);
5492 }
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005493 }
Denys Vlasenko6e42b892011-08-01 18:16:43 +02005494
5495 if (ended_with_ifs)
5496 *ended_with_ifs = last_is_ifs;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005497 debug_print_list("expand_on_ifs[1]", output, n);
5498 return n;
5499}
5500
5501/* Helper to expand $((...)) and heredoc body. These act as if
5502 * they are in double quotes, with the exception that they are not :).
5503 * Just the rules are similar: "expand only $var and `cmd`"
5504 *
5505 * Returns malloced string.
5506 * As an optimization, we return NULL if expansion is not needed.
5507 */
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01005508#if !BASH_PATTERN_SUBST
Denys Vlasenkod98e5c62010-09-10 10:44:23 +02005509/* only ${var/pattern/repl} (its pattern part) needs additional mode */
5510#define encode_then_expand_string(str, process_bkslash, do_unbackslash) \
5511 encode_then_expand_string(str)
5512#endif
5513static char *encode_then_expand_string(const char *str, int process_bkslash, int do_unbackslash)
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005514{
Denys Vlasenko637982f2017-07-06 01:52:23 +02005515#if !BASH_PATTERN_SUBST
5516 const int do_unbackslash = 1;
5517#endif
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005518 char *exp_str;
5519 struct in_str input;
5520 o_string dest = NULL_O_STRING;
5521
5522 if (!strchr(str, '$')
Denys Vlasenko77b32cc2010-09-06 11:27:32 +02005523 && !strchr(str, '\\')
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005524#if ENABLE_HUSH_TICK
5525 && !strchr(str, '`')
5526#endif
5527 ) {
5528 return NULL;
5529 }
5530
5531 /* We need to expand. Example:
5532 * echo $(($a + `echo 1`)) $((1 + $((2)) ))
5533 */
5534 setup_string_in_str(&input, str);
Denys Vlasenkod98e5c62010-09-10 10:44:23 +02005535 encode_string(NULL, &dest, &input, EOF, process_bkslash);
Denys Vlasenko3eab24e2011-03-24 05:25:59 +01005536//TODO: error check (encode_string returns 0 on error)?
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005537 //bb_error_msg("'%s' -> '%s'", str, dest.data);
Denys Vlasenkoebee4102010-09-10 10:17:53 +02005538 exp_str = expand_string_to_string(dest.data, /*unbackslash:*/ do_unbackslash);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005539 //bb_error_msg("'%s' -> '%s'", dest.data, exp_str);
5540 o_free_unsafe(&dest);
5541 return exp_str;
5542}
5543
Denys Vlasenko0b883582016-12-23 16:49:07 +01005544#if ENABLE_FEATURE_SH_MATH
Denys Vlasenko063847d2010-09-15 13:33:02 +02005545static arith_t expand_and_evaluate_arith(const char *arg, const char **errmsg_p)
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005546{
Denys Vlasenko06d44d72010-09-13 12:49:03 +02005547 arith_state_t math_state;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005548 arith_t res;
5549 char *exp_str;
5550
Denys Vlasenko06d44d72010-09-13 12:49:03 +02005551 math_state.lookupvar = get_local_var_value;
5552 math_state.setvar = set_local_var_from_halves;
5553 //math_state.endofname = endofname;
Denys Vlasenkod98e5c62010-09-10 10:44:23 +02005554 exp_str = encode_then_expand_string(arg, /*process_bkslash:*/ 1, /*unbackslash:*/ 1);
Denys Vlasenko06d44d72010-09-13 12:49:03 +02005555 res = arith(&math_state, exp_str ? exp_str : arg);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005556 free(exp_str);
Denys Vlasenko063847d2010-09-15 13:33:02 +02005557 if (errmsg_p)
5558 *errmsg_p = math_state.errmsg;
5559 if (math_state.errmsg)
Denys Vlasenko39701202017-08-02 19:44:05 +02005560 msg_and_die_if_script(math_state.errmsg);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005561 return res;
5562}
5563#endif
5564
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01005565#if BASH_PATTERN_SUBST
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005566/* ${var/[/]pattern[/repl]} helpers */
5567static char *strstr_pattern(char *val, const char *pattern, int *size)
5568{
5569 while (1) {
5570 char *end = scan_and_match(val, pattern, SCAN_MOVE_FROM_RIGHT + SCAN_MATCH_LEFT_HALF);
5571 debug_printf_varexp("val:'%s' pattern:'%s' end:'%s'\n", val, pattern, end);
5572 if (end) {
5573 *size = end - val;
5574 return val;
5575 }
5576 if (*val == '\0')
5577 return NULL;
5578 /* Optimization: if "*pat" did not match the start of "string",
5579 * we know that "tring", "ring" etc will not match too:
5580 */
5581 if (pattern[0] == '*')
5582 return NULL;
5583 val++;
5584 }
5585}
5586static char *replace_pattern(char *val, const char *pattern, const char *repl, char exp_op)
5587{
5588 char *result = NULL;
5589 unsigned res_len = 0;
5590 unsigned repl_len = strlen(repl);
5591
5592 while (1) {
5593 int size;
5594 char *s = strstr_pattern(val, pattern, &size);
5595 if (!s)
5596 break;
5597
5598 result = xrealloc(result, res_len + (s - val) + repl_len + 1);
Denys Vlasenko0675b032017-07-24 02:17:05 +02005599 strcpy(mempcpy(result + res_len, val, s - val), repl);
5600 res_len += (s - val) + repl_len;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005601 debug_printf_varexp("val:'%s' s:'%s' result:'%s'\n", val, s, result);
5602
5603 val = s + size;
5604 if (exp_op == '/')
5605 break;
5606 }
Denys Vlasenko0675b032017-07-24 02:17:05 +02005607 if (*val && result) {
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005608 result = xrealloc(result, res_len + strlen(val) + 1);
5609 strcpy(result + res_len, val);
5610 debug_printf_varexp("val:'%s' result:'%s'\n", val, result);
5611 }
5612 debug_printf_varexp("result:'%s'\n", result);
5613 return result;
5614}
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01005615#endif /* BASH_PATTERN_SUBST */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005616
5617/* Helper:
5618 * Handles <SPECIAL_VAR_SYMBOL>varname...<SPECIAL_VAR_SYMBOL> construct.
5619 */
Denys Vlasenkobfc02a72010-09-09 14:38:46 +02005620static NOINLINE const char *expand_one_var(char **to_be_freed_pp, char *arg, char **pp)
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005621{
5622 const char *val = NULL;
5623 char *to_be_freed = NULL;
5624 char *p = *pp;
5625 char *var;
5626 char first_char;
5627 char exp_op;
5628 char exp_save = exp_save; /* for compiler */
5629 char *exp_saveptr; /* points to expansion operator */
5630 char *exp_word = exp_word; /* for compiler */
Denys Vlasenkobfc02a72010-09-09 14:38:46 +02005631 char arg0;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005632
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02005633 *p = '\0'; /* replace trailing SPECIAL_VAR_SYMBOL */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005634 var = arg;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005635 exp_saveptr = arg[1] ? strchr(VAR_ENCODED_SUBST_OPS, arg[1]) : NULL;
Denys Vlasenkobfc02a72010-09-09 14:38:46 +02005636 arg0 = arg[0];
5637 first_char = arg[0] = arg0 & 0x7f;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005638 exp_op = 0;
5639
Denys Vlasenko2093ad22017-07-26 00:07:27 +02005640 if (first_char == '#' && arg[1] /* ${#...} but not ${#} */
5641 && (!exp_saveptr /* and ( not(${#<op_char>...}) */
5642 || (arg[2] == '\0' && strchr(SPECIAL_VARS_STR, arg[1])) /* or ${#C} "len of $C" ) */
5643 ) /* NB: skipping ^^^specvar check mishandles ${#::2} */
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02005644 ) {
5645 /* It must be length operator: ${#var} */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005646 var++;
5647 exp_op = 'L';
5648 } else {
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02005649 /* Maybe handle parameter expansion */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005650 if (exp_saveptr /* if 2nd char is one of expansion operators */
5651 && strchr(NUMERIC_SPECVARS_STR, first_char) /* 1st char is special variable */
5652 ) {
5653 /* ${?:0}, ${#[:]%0} etc */
5654 exp_saveptr = var + 1;
5655 } else {
5656 /* ${?}, ${var}, ${var:0}, ${var[:]%0} etc */
5657 exp_saveptr = var+1 + strcspn(var+1, VAR_ENCODED_SUBST_OPS);
5658 }
5659 exp_op = exp_save = *exp_saveptr;
5660 if (exp_op) {
5661 exp_word = exp_saveptr + 1;
5662 if (exp_op == ':') {
5663 exp_op = *exp_word++;
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02005664//TODO: try ${var:} and ${var:bogus} in non-bash config
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01005665 if (BASH_SUBSTR
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02005666 && (!exp_op || !strchr(MINUS_PLUS_EQUAL_QUESTION, exp_op))
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005667 ) {
5668 /* oops... it's ${var:N[:M]}, not ${var:?xxx} or some such */
5669 exp_op = ':';
5670 exp_word--;
5671 }
5672 }
5673 *exp_saveptr = '\0';
5674 } /* else: it's not an expansion op, but bare ${var} */
5675 }
5676
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02005677 /* Look up the variable in question */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005678 if (isdigit(var[0])) {
Denys Vlasenko77a7b552010-09-09 12:40:03 +02005679 /* parse_dollar should have vetted var for us */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005680 int n = xatoi_positive(var);
5681 if (n < G.global_argc)
5682 val = G.global_argv[n];
5683 /* else val remains NULL: $N with too big N */
5684 } else {
5685 switch (var[0]) {
5686 case '$': /* pid */
5687 val = utoa(G.root_pid);
5688 break;
5689 case '!': /* bg pid */
5690 val = G.last_bg_pid ? utoa(G.last_bg_pid) : "";
5691 break;
5692 case '?': /* exitcode */
5693 val = utoa(G.last_exitcode);
5694 break;
5695 case '#': /* argc */
5696 val = utoa(G.global_argc ? G.global_argc-1 : 0);
5697 break;
5698 default:
5699 val = get_local_var_value(var);
5700 }
5701 }
5702
5703 /* Handle any expansions */
5704 if (exp_op == 'L') {
Denys Vlasenkoc538d5b2014-08-13 09:57:44 +02005705 reinit_unicode_for_hush();
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005706 debug_printf_expand("expand: length(%s)=", val);
Denys Vlasenkoc538d5b2014-08-13 09:57:44 +02005707 val = utoa(val ? unicode_strlen(val) : 0);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005708 debug_printf_expand("%s\n", val);
5709 } else if (exp_op) {
5710 if (exp_op == '%' || exp_op == '#') {
5711 /* Standard-mandated substring removal ops:
5712 * ${parameter%word} - remove smallest suffix pattern
5713 * ${parameter%%word} - remove largest suffix pattern
5714 * ${parameter#word} - remove smallest prefix pattern
5715 * ${parameter##word} - remove largest prefix pattern
5716 *
5717 * Word is expanded to produce a glob pattern.
5718 * Then var's value is matched to it and matching part removed.
5719 */
5720 if (val && val[0]) {
Denys Vlasenko4f870492010-09-10 11:06:01 +02005721 char *t;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005722 char *exp_exp_word;
5723 char *loc;
5724 unsigned scan_flags = pick_scan(exp_op, *exp_word);
Denys Vlasenkoe4dcba12010-10-28 18:57:19 +02005725 if (exp_op == *exp_word) /* ## or %% */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005726 exp_word++;
Denys Vlasenkod98e5c62010-09-10 10:44:23 +02005727 exp_exp_word = encode_then_expand_string(exp_word, /*process_bkslash:*/ 1, /*unbackslash:*/ 1);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005728 if (exp_exp_word)
5729 exp_word = exp_exp_word;
Denys Vlasenko4f870492010-09-10 11:06:01 +02005730 /* HACK ALERT. We depend here on the fact that
5731 * G.global_argv and results of utoa and get_local_var_value
5732 * are actually in writable memory:
5733 * scan_and_match momentarily stores NULs there. */
5734 t = (char*)val;
5735 loc = scan_and_match(t, exp_word, scan_flags);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005736 //bb_error_msg("op:%c str:'%s' pat:'%s' res:'%s'",
Denys Vlasenko4f870492010-09-10 11:06:01 +02005737 // exp_op, t, exp_word, loc);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005738 free(exp_exp_word);
5739 if (loc) { /* match was found */
5740 if (scan_flags & SCAN_MATCH_LEFT_HALF) /* #[#] */
Denys Vlasenko4f870492010-09-10 11:06:01 +02005741 val = loc; /* take right part */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005742 else /* %[%] */
Denys Vlasenko4f870492010-09-10 11:06:01 +02005743 val = to_be_freed = xstrndup(val, loc - val); /* left */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005744 }
5745 }
5746 }
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01005747#if BASH_PATTERN_SUBST
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005748 else if (exp_op == '/' || exp_op == '\\') {
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02005749 /* It's ${var/[/]pattern[/repl]} thing.
5750 * Note that in encoded form it has TWO parts:
5751 * var/pattern<SPECIAL_VAR_SYMBOL>repl<SPECIAL_VAR_SYMBOL>
Denys Vlasenko4f870492010-09-10 11:06:01 +02005752 * and if // is used, it is encoded as \:
5753 * var\pattern<SPECIAL_VAR_SYMBOL>repl<SPECIAL_VAR_SYMBOL>
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02005754 */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005755 /* Empty variable always gives nothing: */
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02005756 // "v=''; echo ${v/*/w}" prints "", not "w"
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005757 if (val && val[0]) {
Denys Vlasenko4f870492010-09-10 11:06:01 +02005758 /* pattern uses non-standard expansion.
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02005759 * repl should be unbackslashed and globbed
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02005760 * by the usual expansion rules:
5761 * >az; >bz;
5762 * v='a bz'; echo "${v/a*z/a*z}" prints "a*z"
5763 * v='a bz'; echo "${v/a*z/\z}" prints "\z"
5764 * v='a bz'; echo ${v/a*z/a*z} prints "az"
5765 * v='a bz'; echo ${v/a*z/\z} prints "z"
5766 * (note that a*z _pattern_ is never globbed!)
5767 */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005768 char *pattern, *repl, *t;
Denys Vlasenkod98e5c62010-09-10 10:44:23 +02005769 pattern = encode_then_expand_string(exp_word, /*process_bkslash:*/ 0, /*unbackslash:*/ 0);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005770 if (!pattern)
5771 pattern = xstrdup(exp_word);
5772 debug_printf_varexp("pattern:'%s'->'%s'\n", exp_word, pattern);
5773 *p++ = SPECIAL_VAR_SYMBOL;
5774 exp_word = p;
5775 p = strchr(p, SPECIAL_VAR_SYMBOL);
5776 *p = '\0';
Denys Vlasenkod98e5c62010-09-10 10:44:23 +02005777 repl = encode_then_expand_string(exp_word, /*process_bkslash:*/ arg0 & 0x80, /*unbackslash:*/ 1);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005778 debug_printf_varexp("repl:'%s'->'%s'\n", exp_word, repl);
5779 /* HACK ALERT. We depend here on the fact that
5780 * G.global_argv and results of utoa and get_local_var_value
5781 * are actually in writable memory:
5782 * replace_pattern momentarily stores NULs there. */
5783 t = (char*)val;
5784 to_be_freed = replace_pattern(t,
5785 pattern,
5786 (repl ? repl : exp_word),
5787 exp_op);
5788 if (to_be_freed) /* at least one replace happened */
5789 val = to_be_freed;
5790 free(pattern);
5791 free(repl);
5792 }
5793 }
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01005794#endif /* BASH_PATTERN_SUBST */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005795 else if (exp_op == ':') {
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01005796#if BASH_SUBSTR && ENABLE_FEATURE_SH_MATH
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005797 /* It's ${var:N[:M]} bashism.
5798 * Note that in encoded form it has TWO parts:
5799 * var:N<SPECIAL_VAR_SYMBOL>M<SPECIAL_VAR_SYMBOL>
5800 */
5801 arith_t beg, len;
Denys Vlasenko063847d2010-09-15 13:33:02 +02005802 const char *errmsg;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005803
Denys Vlasenko063847d2010-09-15 13:33:02 +02005804 beg = expand_and_evaluate_arith(exp_word, &errmsg);
5805 if (errmsg)
5806 goto arith_err;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005807 debug_printf_varexp("beg:'%s'=%lld\n", exp_word, (long long)beg);
5808 *p++ = SPECIAL_VAR_SYMBOL;
5809 exp_word = p;
5810 p = strchr(p, SPECIAL_VAR_SYMBOL);
5811 *p = '\0';
Denys Vlasenko063847d2010-09-15 13:33:02 +02005812 len = expand_and_evaluate_arith(exp_word, &errmsg);
5813 if (errmsg)
5814 goto arith_err;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005815 debug_printf_varexp("len:'%s'=%lld\n", exp_word, (long long)len);
Denys Vlasenkoe32b6502017-07-17 16:46:57 +02005816 if (beg < 0) {
5817 /* negative beg counts from the end */
5818 beg = (arith_t)strlen(val) + beg;
5819 if (beg < 0) /* ${v: -999999} is "" */
5820 beg = len = 0;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005821 }
Denys Vlasenkoe32b6502017-07-17 16:46:57 +02005822 debug_printf_varexp("from val:'%s'\n", val);
5823 if (len < 0) {
5824 /* in bash, len=-n means strlen()-n */
5825 len = (arith_t)strlen(val) - beg + len;
5826 if (len < 0) /* bash compat */
Denys Vlasenko39701202017-08-02 19:44:05 +02005827 msg_and_die_if_script("%s: substring expression < 0", var);
Denys Vlasenkoe32b6502017-07-17 16:46:57 +02005828 }
Denys Vlasenko0ba80e42017-07-17 16:50:20 +02005829 if (len <= 0 || !val || beg >= strlen(val)) {
Denys Vlasenkoe32b6502017-07-17 16:46:57 +02005830 arith_err:
5831 val = NULL;
5832 } else {
5833 /* Paranoia. What if user entered 9999999999999
5834 * which fits in arith_t but not int? */
5835 if (len >= INT_MAX)
5836 len = INT_MAX;
5837 val = to_be_freed = xstrndup(val + beg, len);
5838 }
5839 debug_printf_varexp("val:'%s'\n", val);
5840#else /* not (HUSH_SUBSTR_EXPANSION && FEATURE_SH_MATH) */
Denys Vlasenko39701202017-08-02 19:44:05 +02005841 msg_and_die_if_script("malformed ${%s:...}", var);
Denys Vlasenkoe32b6502017-07-17 16:46:57 +02005842 val = NULL;
5843#endif
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005844 } else { /* one of "-=+?" */
5845 /* Standard-mandated substitution ops:
5846 * ${var?word} - indicate error if unset
5847 * If var is unset, word (or a message indicating it is unset
5848 * if word is null) is written to standard error
5849 * and the shell exits with a non-zero exit status.
5850 * Otherwise, the value of var is substituted.
5851 * ${var-word} - use default value
5852 * If var is unset, word is substituted.
5853 * ${var=word} - assign and use default value
5854 * If var is unset, word is assigned to var.
5855 * In all cases, final value of var is substituted.
5856 * ${var+word} - use alternative value
5857 * If var is unset, null is substituted.
5858 * Otherwise, word is substituted.
5859 *
5860 * Word is subjected to tilde expansion, parameter expansion,
5861 * command substitution, and arithmetic expansion.
5862 * If word is not needed, it is not expanded.
5863 *
5864 * Colon forms (${var:-word}, ${var:=word} etc) do the same,
5865 * but also treat null var as if it is unset.
5866 */
5867 int use_word = (!val || ((exp_save == ':') && !val[0]));
5868 if (exp_op == '+')
5869 use_word = !use_word;
5870 debug_printf_expand("expand: op:%c (null:%s) test:%i\n", exp_op,
5871 (exp_save == ':') ? "true" : "false", use_word);
5872 if (use_word) {
Denys Vlasenkod98e5c62010-09-10 10:44:23 +02005873 to_be_freed = encode_then_expand_string(exp_word, /*process_bkslash:*/ 1, /*unbackslash:*/ 1);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005874 if (to_be_freed)
5875 exp_word = to_be_freed;
5876 if (exp_op == '?') {
5877 /* mimic bash message */
Denys Vlasenko39701202017-08-02 19:44:05 +02005878 msg_and_die_if_script("%s: %s",
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005879 var,
Denys Vlasenko645c6972017-07-25 15:18:57 +02005880 exp_word[0]
5881 ? exp_word
5882 : "parameter null or not set"
5883 /* ash has more specific messages, a-la: */
5884 /*: (exp_save == ':' ? "parameter null or not set" : "parameter not set")*/
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005885 );
5886//TODO: how interactive bash aborts expansion mid-command?
5887 } else {
5888 val = exp_word;
5889 }
5890
5891 if (exp_op == '=') {
5892 /* ${var=[word]} or ${var:=[word]} */
5893 if (isdigit(var[0]) || var[0] == '#') {
5894 /* mimic bash message */
Denys Vlasenko39701202017-08-02 19:44:05 +02005895 msg_and_die_if_script("$%s: cannot assign in this way", var);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005896 val = NULL;
5897 } else {
5898 char *new_var = xasprintf("%s=%s", var, val);
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02005899 set_local_var(new_var, /*flag:*/ 0);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005900 }
5901 }
5902 }
5903 } /* one of "-=+?" */
5904
5905 *exp_saveptr = exp_save;
5906 } /* if (exp_op) */
5907
Denys Vlasenkobfc02a72010-09-09 14:38:46 +02005908 arg[0] = arg0;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005909
5910 *pp = p;
5911 *to_be_freed_pp = to_be_freed;
5912 return val;
5913}
5914
5915/* Expand all variable references in given string, adding words to list[]
5916 * at n, n+1,... positions. Return updated n (so that list[n] is next one
5917 * to be filled). This routine is extremely tricky: has to deal with
5918 * variables/parameters with whitespace, $* and $@, and constructs like
5919 * 'echo -$*-'. If you play here, you must run testsuite afterwards! */
Denys Vlasenko95d48f22010-09-08 13:58:55 +02005920static NOINLINE int expand_vars_to_list(o_string *output, int n, char *arg)
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005921{
Denys Vlasenko95d48f22010-09-08 13:58:55 +02005922 /* output->o_expflags & EXP_FLAG_SINGLEWORD (0x80) if we are in
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005923 * expansion of right-hand side of assignment == 1-element expand.
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005924 */
Denys Vlasenkobfc02a72010-09-09 14:38:46 +02005925 char cant_be_null = 0; /* only bit 0x80 matters */
Denys Vlasenko6e42b892011-08-01 18:16:43 +02005926 int ended_in_ifs = 0; /* did last unquoted expansion end with IFS chars? */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005927 char *p;
5928
Denys Vlasenko95d48f22010-09-08 13:58:55 +02005929 debug_printf_expand("expand_vars_to_list: arg:'%s' singleword:%x\n", arg,
5930 !!(output->o_expflags & EXP_FLAG_SINGLEWORD));
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005931 debug_print_list("expand_vars_to_list", output, n);
5932 n = o_save_ptr(output, n);
5933 debug_print_list("expand_vars_to_list[0]", output, n);
5934
5935 while ((p = strchr(arg, SPECIAL_VAR_SYMBOL)) != NULL) {
5936 char first_ch;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005937 char *to_be_freed = NULL;
5938 const char *val = NULL;
5939#if ENABLE_HUSH_TICK
5940 o_string subst_result = NULL_O_STRING;
5941#endif
Denys Vlasenko0b883582016-12-23 16:49:07 +01005942#if ENABLE_FEATURE_SH_MATH
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005943 char arith_buf[sizeof(arith_t)*3 + 2];
5944#endif
Denys Vlasenko6e42b892011-08-01 18:16:43 +02005945
5946 if (ended_in_ifs) {
5947 o_addchr(output, '\0');
5948 n = o_save_ptr(output, n);
5949 ended_in_ifs = 0;
5950 }
5951
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005952 o_addblock(output, arg, p - arg);
5953 debug_print_list("expand_vars_to_list[1]", output, n);
5954 arg = ++p;
5955 p = strchr(p, SPECIAL_VAR_SYMBOL);
5956
Denys Vlasenkobfc02a72010-09-09 14:38:46 +02005957 /* Fetch special var name (if it is indeed one of them)
5958 * and quote bit, force the bit on if singleword expansion -
5959 * important for not getting v=$@ expand to many words. */
Denys Vlasenko95d48f22010-09-08 13:58:55 +02005960 first_ch = arg[0] | (output->o_expflags & EXP_FLAG_SINGLEWORD);
Denys Vlasenkobfc02a72010-09-09 14:38:46 +02005961
5962 /* Is this variable quoted and thus expansion can't be null?
5963 * "$@" is special. Even if quoted, it can still
5964 * expand to nothing (not even an empty string),
5965 * thus it is excluded. */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005966 if ((first_ch & 0x7f) != '@')
Denys Vlasenkobfc02a72010-09-09 14:38:46 +02005967 cant_be_null |= first_ch;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005968
5969 switch (first_ch & 0x7f) {
5970 /* Highest bit in first_ch indicates that var is double-quoted */
5971 case '*':
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02005972 case '@': {
5973 int i;
5974 if (!G.global_argv[1])
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005975 break;
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02005976 i = 1;
Denys Vlasenkobfc02a72010-09-09 14:38:46 +02005977 cant_be_null |= first_ch; /* do it for "$@" _now_, when we know it's not empty */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005978 if (!(first_ch & 0x80)) { /* unquoted $* or $@ */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005979 while (G.global_argv[i]) {
Denys Vlasenko6e42b892011-08-01 18:16:43 +02005980 n = expand_on_ifs(NULL, output, n, G.global_argv[i]);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005981 debug_printf_expand("expand_vars_to_list: argv %d (last %d)\n", i, G.global_argc - 1);
5982 if (G.global_argv[i++][0] && G.global_argv[i]) {
5983 /* this argv[] is not empty and not last:
5984 * put terminating NUL, start new word */
5985 o_addchr(output, '\0');
5986 debug_print_list("expand_vars_to_list[2]", output, n);
5987 n = o_save_ptr(output, n);
5988 debug_print_list("expand_vars_to_list[3]", output, n);
5989 }
5990 }
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005991 } else
Denys Vlasenko95d48f22010-09-08 13:58:55 +02005992 /* If EXP_FLAG_SINGLEWORD, we handle assignment 'a=....$@.....'
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005993 * and in this case should treat it like '$*' - see 'else...' below */
Denys Vlasenko95d48f22010-09-08 13:58:55 +02005994 if (first_ch == ('@'|0x80) /* quoted $@ */
Denys Vlasenkobfc02a72010-09-09 14:38:46 +02005995 && !(output->o_expflags & EXP_FLAG_SINGLEWORD) /* not v="$@" case */
Denys Vlasenko95d48f22010-09-08 13:58:55 +02005996 ) {
Denys Vlasenkob36abf22010-09-05 14:50:59 +02005997 while (1) {
5998 o_addQstr(output, G.global_argv[i]);
5999 if (++i >= G.global_argc)
6000 break;
6001 o_addchr(output, '\0');
6002 debug_print_list("expand_vars_to_list[4]", output, n);
6003 n = o_save_ptr(output, n);
6004 }
Denys Vlasenkobfc02a72010-09-09 14:38:46 +02006005 } else { /* quoted $* (or v="$@" case): add as one word */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006006 while (1) {
6007 o_addQstr(output, G.global_argv[i]);
6008 if (!G.global_argv[++i])
6009 break;
6010 if (G.ifs[0])
6011 o_addchr(output, G.ifs[0]);
6012 }
Denys Vlasenko4fb53fb2011-08-01 14:06:20 +02006013 output->has_quoted_part = 1;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006014 }
6015 break;
Denys Vlasenkoc49d2d92010-09-06 10:26:37 +02006016 }
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006017 case SPECIAL_VAR_SYMBOL: /* <SPECIAL_VAR_SYMBOL><SPECIAL_VAR_SYMBOL> */
6018 /* "Empty variable", used to make "" etc to not disappear */
Denys Vlasenko4fb53fb2011-08-01 14:06:20 +02006019 output->has_quoted_part = 1;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006020 arg++;
Denys Vlasenkobfc02a72010-09-09 14:38:46 +02006021 cant_be_null = 0x80;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006022 break;
6023#if ENABLE_HUSH_TICK
6024 case '`': /* <SPECIAL_VAR_SYMBOL>`cmd<SPECIAL_VAR_SYMBOL> */
Denys Vlasenkobfc02a72010-09-09 14:38:46 +02006025 *p = '\0'; /* replace trailing <SPECIAL_VAR_SYMBOL> */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006026 arg++;
6027 /* Can't just stuff it into output o_string,
6028 * expanded result may need to be globbed
Denys Vlasenko10ad6222017-04-17 16:13:32 +02006029 * and $IFS-split */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006030 debug_printf_subst("SUBST '%s' first_ch %x\n", arg, first_ch);
6031 G.last_exitcode = process_command_subs(&subst_result, arg);
6032 debug_printf_subst("SUBST RES:%d '%s'\n", G.last_exitcode, subst_result.data);
6033 val = subst_result.data;
6034 goto store_val;
6035#endif
Denys Vlasenko0b883582016-12-23 16:49:07 +01006036#if ENABLE_FEATURE_SH_MATH
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006037 case '+': { /* <SPECIAL_VAR_SYMBOL>+cmd<SPECIAL_VAR_SYMBOL> */
6038 arith_t res;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006039
6040 arg++; /* skip '+' */
6041 *p = '\0'; /* replace trailing <SPECIAL_VAR_SYMBOL> */
6042 debug_printf_subst("ARITH '%s' first_ch %x\n", arg, first_ch);
Denys Vlasenko063847d2010-09-15 13:33:02 +02006043 res = expand_and_evaluate_arith(arg, NULL);
Denys Vlasenkobed7c812010-09-16 11:50:46 +02006044 debug_printf_subst("ARITH RES '"ARITH_FMT"'\n", res);
6045 sprintf(arith_buf, ARITH_FMT, res);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006046 val = arith_buf;
6047 break;
6048 }
6049#endif
6050 default:
Denys Vlasenkobfc02a72010-09-09 14:38:46 +02006051 val = expand_one_var(&to_be_freed, arg, &p);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006052 IF_HUSH_TICK(store_val:)
6053 if (!(first_ch & 0x80)) { /* unquoted $VAR */
Denys Vlasenko5b686cb2010-09-08 13:44:34 +02006054 debug_printf_expand("unquoted '%s', output->o_escape:%d\n", val,
6055 !!(output->o_expflags & EXP_FLAG_ESC_GLOB_CHARS));
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006056 if (val && val[0]) {
Denys Vlasenko6e42b892011-08-01 18:16:43 +02006057 n = expand_on_ifs(&ended_in_ifs, output, n, val);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006058 val = NULL;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006059 }
6060 } else { /* quoted $VAR, val will be appended below */
Denys Vlasenko4fb53fb2011-08-01 14:06:20 +02006061 output->has_quoted_part = 1;
Denys Vlasenko5b686cb2010-09-08 13:44:34 +02006062 debug_printf_expand("quoted '%s', output->o_escape:%d\n", val,
6063 !!(output->o_expflags & EXP_FLAG_ESC_GLOB_CHARS));
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006064 }
6065 break;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006066 } /* switch (char after <SPECIAL_VAR_SYMBOL>) */
6067
6068 if (val && val[0]) {
6069 o_addQstr(output, val);
6070 }
6071 free(to_be_freed);
Denys Vlasenkobfc02a72010-09-09 14:38:46 +02006072
6073 /* Restore NULL'ed SPECIAL_VAR_SYMBOL.
6074 * Do the check to avoid writing to a const string. */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006075 if (*p != SPECIAL_VAR_SYMBOL)
6076 *p = SPECIAL_VAR_SYMBOL;
6077
6078#if ENABLE_HUSH_TICK
6079 o_free(&subst_result);
6080#endif
6081 arg = ++p;
6082 } /* end of "while (SPECIAL_VAR_SYMBOL is found) ..." */
6083
6084 if (arg[0]) {
Denys Vlasenko6e42b892011-08-01 18:16:43 +02006085 if (ended_in_ifs) {
6086 o_addchr(output, '\0');
6087 n = o_save_ptr(output, n);
6088 }
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006089 debug_print_list("expand_vars_to_list[a]", output, n);
6090 /* this part is literal, and it was already pre-quoted
6091 * if needed (much earlier), do not use o_addQstr here! */
6092 o_addstr_with_NUL(output, arg);
6093 debug_print_list("expand_vars_to_list[b]", output, n);
6094 } else if (output->length == o_get_last_ptr(output, n) /* expansion is empty */
Denys Vlasenkobfc02a72010-09-09 14:38:46 +02006095 && !(cant_be_null & 0x80) /* and all vars were not quoted. */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006096 ) {
6097 n--;
6098 /* allow to reuse list[n] later without re-growth */
6099 output->has_empty_slot = 1;
6100 } else {
6101 o_addchr(output, '\0');
6102 }
6103
6104 return n;
6105}
6106
Denys Vlasenko95d48f22010-09-08 13:58:55 +02006107static char **expand_variables(char **argv, unsigned expflags)
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006108{
6109 int n;
6110 char **list;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006111 o_string output = NULL_O_STRING;
6112
Denys Vlasenko95d48f22010-09-08 13:58:55 +02006113 output.o_expflags = expflags;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006114
6115 n = 0;
Denys Vlasenkoda463fb2010-09-07 09:53:50 +02006116 while (*argv) {
Denys Vlasenko95d48f22010-09-08 13:58:55 +02006117 n = expand_vars_to_list(&output, n, *argv);
Denys Vlasenkoda463fb2010-09-07 09:53:50 +02006118 argv++;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006119 }
6120 debug_print_list("expand_variables", &output, n);
6121
6122 /* output.data (malloced in one block) gets returned in "list" */
6123 list = o_finalize_list(&output, n);
6124 debug_print_strings("expand_variables[1]", list);
6125 return list;
6126}
6127
6128static char **expand_strvec_to_strvec(char **argv)
6129{
Denys Vlasenko5b686cb2010-09-08 13:44:34 +02006130 return expand_variables(argv, EXP_FLAG_GLOB | EXP_FLAG_ESC_GLOB_CHARS);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006131}
6132
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01006133#if BASH_TEST2
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006134static char **expand_strvec_to_strvec_singleword_noglob(char **argv)
6135{
Denys Vlasenko5b686cb2010-09-08 13:44:34 +02006136 return expand_variables(argv, EXP_FLAG_SINGLEWORD);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006137}
6138#endif
6139
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02006140/* Used for expansion of right hand of assignments,
6141 * $((...)), heredocs, variable espansion parts.
6142 *
6143 * NB: should NOT do globbing!
6144 * "export v=/bin/c*; env | grep ^v=" outputs "v=/bin/c*"
6145 */
Denys Vlasenkoebee4102010-09-10 10:17:53 +02006146static char *expand_string_to_string(const char *str, int do_unbackslash)
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006147{
Denys Vlasenko637982f2017-07-06 01:52:23 +02006148#if !BASH_PATTERN_SUBST && !ENABLE_HUSH_CASE
Denys Vlasenkod98e5c62010-09-10 10:44:23 +02006149 const int do_unbackslash = 1;
6150#endif
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006151 char *argv[2], **list;
6152
Denys Vlasenkoebee4102010-09-10 10:17:53 +02006153 debug_printf_expand("string_to_string<='%s'\n", str);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006154 /* This is generally an optimization, but it also
6155 * handles "", which otherwise trips over !list[0] check below.
6156 * (is this ever happens that we actually get str="" here?)
6157 */
6158 if (!strchr(str, SPECIAL_VAR_SYMBOL) && !strchr(str, '\\')) {
6159 //TODO: Can use on strings with \ too, just unbackslash() them?
Denys Vlasenkoebee4102010-09-10 10:17:53 +02006160 debug_printf_expand("string_to_string(fast)=>'%s'\n", str);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006161 return xstrdup(str);
6162 }
6163
6164 argv[0] = (char*)str;
6165 argv[1] = NULL;
Denys Vlasenkoebee4102010-09-10 10:17:53 +02006166 list = expand_variables(argv, do_unbackslash
6167 ? EXP_FLAG_ESC_GLOB_CHARS | EXP_FLAG_SINGLEWORD
6168 : EXP_FLAG_SINGLEWORD
6169 );
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006170 if (HUSH_DEBUG)
6171 if (!list[0] || list[1])
6172 bb_error_msg_and_die("BUG in varexp2");
6173 /* actually, just move string 2*sizeof(char*) bytes back */
6174 overlapping_strcpy((char*)list, list[0]);
Denys Vlasenkoebee4102010-09-10 10:17:53 +02006175 if (do_unbackslash)
6176 unbackslash((char*)list);
6177 debug_printf_expand("string_to_string=>'%s'\n", (char*)list);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006178 return (char*)list;
6179}
6180
Denys Vlasenkobd43c672017-07-05 23:12:15 +02006181/* Used for "eval" builtin and case string */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006182static char* expand_strvec_to_string(char **argv)
6183{
6184 char **list;
6185
Denys Vlasenko5b686cb2010-09-08 13:44:34 +02006186 list = expand_variables(argv, EXP_FLAG_SINGLEWORD);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006187 /* Convert all NULs to spaces */
6188 if (list[0]) {
6189 int n = 1;
6190 while (list[n]) {
6191 if (HUSH_DEBUG)
6192 if (list[n-1] + strlen(list[n-1]) + 1 != list[n])
6193 bb_error_msg_and_die("BUG in varexp3");
6194 /* bash uses ' ' regardless of $IFS contents */
6195 list[n][-1] = ' ';
6196 n++;
6197 }
6198 }
Denys Vlasenko78c9c732016-09-29 01:44:17 +02006199 overlapping_strcpy((char*)list, list[0] ? list[0] : "");
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006200 debug_printf_expand("strvec_to_string='%s'\n", (char*)list);
6201 return (char*)list;
6202}
6203
6204static char **expand_assignments(char **argv, int count)
6205{
6206 int i;
6207 char **p;
6208
6209 G.expanded_assignments = p = NULL;
6210 /* Expand assignments into one string each */
6211 for (i = 0; i < count; i++) {
Denys Vlasenkoebee4102010-09-10 10:17:53 +02006212 G.expanded_assignments = p = add_string_to_strings(p, expand_string_to_string(argv[i], /*unbackslash:*/ 1));
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006213 }
6214 G.expanded_assignments = NULL;
6215 return p;
6216}
6217
6218
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02006219static void switch_off_special_sigs(unsigned mask)
6220{
6221 unsigned sig = 0;
6222 while ((mask >>= 1) != 0) {
6223 sig++;
6224 if (!(mask & 1))
6225 continue;
Denys Vlasenko7a85c602017-01-08 17:40:18 +01006226#if ENABLE_HUSH_TRAP
6227 if (G_traps) {
6228 if (G_traps[sig] && !G_traps[sig][0])
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02006229 /* trap is '', has to remain SIG_IGN */
6230 continue;
Denys Vlasenko7a85c602017-01-08 17:40:18 +01006231 free(G_traps[sig]);
6232 G_traps[sig] = NULL;
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02006233 }
Denys Vlasenko7a85c602017-01-08 17:40:18 +01006234#endif
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02006235 /* We are here only if no trap or trap was not '' */
Denys Vlasenko0806e402011-05-12 23:06:20 +02006236 install_sighandler(sig, SIG_DFL);
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02006237 }
6238}
6239
Denys Vlasenkob347df92011-08-09 22:49:15 +02006240#if BB_MMU
6241/* never called */
6242void re_execute_shell(char ***to_free, const char *s,
6243 char *g_argv0, char **g_argv,
6244 char **builtin_argv) NORETURN;
6245
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006246static void reset_traps_to_defaults(void)
6247{
6248 /* This function is always called in a child shell
6249 * after fork (not vfork, NOMMU doesn't use this function).
6250 */
Denys Vlasenko7a85c602017-01-08 17:40:18 +01006251 IF_HUSH_TRAP(unsigned sig;)
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006252 unsigned mask;
6253
6254 /* Child shells are not interactive.
6255 * SIGTTIN/SIGTTOU/SIGTSTP should not have special handling.
6256 * Testcase: (while :; do :; done) + ^Z should background.
6257 * Same goes for SIGTERM, SIGHUP, SIGINT.
6258 */
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02006259 mask = (G.special_sig_mask & SPECIAL_INTERACTIVE_SIGS) | G_fatal_sig_mask;
Denys Vlasenko7a85c602017-01-08 17:40:18 +01006260 if (!G_traps && !mask)
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02006261 return; /* already no traps and no special sigs */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006262
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02006263 /* Switch off special sigs */
6264 switch_off_special_sigs(mask);
Denys Vlasenko7a85c602017-01-08 17:40:18 +01006265# if ENABLE_HUSH_JOB
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02006266 G_fatal_sig_mask = 0;
Denys Vlasenko7a85c602017-01-08 17:40:18 +01006267# endif
Denys Vlasenko10c01312011-05-11 11:49:21 +02006268 G.special_sig_mask &= ~SPECIAL_INTERACTIVE_SIGS;
Denys Vlasenkof58f7052011-05-12 02:10:33 +02006269 /* SIGQUIT,SIGCHLD and maybe SPECIAL_JOBSTOP_SIGS
6270 * remain set in G.special_sig_mask */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006271
Denys Vlasenko7a85c602017-01-08 17:40:18 +01006272# if ENABLE_HUSH_TRAP
6273 if (!G_traps)
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02006274 return;
6275
6276 /* Reset all sigs to default except ones with empty traps */
6277 for (sig = 0; sig < NSIG; sig++) {
Denys Vlasenko7a85c602017-01-08 17:40:18 +01006278 if (!G_traps[sig])
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02006279 continue; /* no trap: nothing to do */
Denys Vlasenko7a85c602017-01-08 17:40:18 +01006280 if (!G_traps[sig][0])
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02006281 continue; /* empty trap: has to remain SIG_IGN */
6282 /* sig has non-empty trap, reset it: */
Denys Vlasenko7a85c602017-01-08 17:40:18 +01006283 free(G_traps[sig]);
6284 G_traps[sig] = NULL;
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02006285 /* There is no signal for trap 0 (EXIT) */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006286 if (sig == 0)
6287 continue;
Denys Vlasenko0806e402011-05-12 23:06:20 +02006288 install_sighandler(sig, pick_sighandler(sig));
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006289 }
Denys Vlasenko7a85c602017-01-08 17:40:18 +01006290# endif
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006291}
6292
6293#else /* !BB_MMU */
6294
6295static void re_execute_shell(char ***to_free, const char *s,
6296 char *g_argv0, char **g_argv,
6297 char **builtin_argv) NORETURN;
6298static void re_execute_shell(char ***to_free, const char *s,
6299 char *g_argv0, char **g_argv,
6300 char **builtin_argv)
6301{
6302# define NOMMU_HACK_FMT ("-$%x:%x:%x:%x:%x:%llx" IF_HUSH_LOOPS(":%x"))
6303 /* delims + 2 * (number of bytes in printed hex numbers) */
6304 char param_buf[sizeof(NOMMU_HACK_FMT) + 2 * (sizeof(int)*6 + sizeof(long long)*1)];
6305 char *heredoc_argv[4];
6306 struct variable *cur;
6307# if ENABLE_HUSH_FUNCTIONS
6308 struct function *funcp;
6309# endif
6310 char **argv, **pp;
6311 unsigned cnt;
6312 unsigned long long empty_trap_mask;
6313
6314 if (!g_argv0) { /* heredoc */
6315 argv = heredoc_argv;
6316 argv[0] = (char *) G.argv0_for_re_execing;
6317 argv[1] = (char *) "-<";
6318 argv[2] = (char *) s;
6319 argv[3] = NULL;
6320 pp = &argv[3]; /* used as pointer to empty environment */
6321 goto do_exec;
6322 }
6323
6324 cnt = 0;
6325 pp = builtin_argv;
6326 if (pp) while (*pp++)
6327 cnt++;
6328
6329 empty_trap_mask = 0;
Denys Vlasenko7a85c602017-01-08 17:40:18 +01006330 if (G_traps) {
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006331 int sig;
6332 for (sig = 1; sig < NSIG; sig++) {
Denys Vlasenko7a85c602017-01-08 17:40:18 +01006333 if (G_traps[sig] && !G_traps[sig][0])
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006334 empty_trap_mask |= 1LL << sig;
6335 }
6336 }
6337
6338 sprintf(param_buf, NOMMU_HACK_FMT
6339 , (unsigned) G.root_pid
6340 , (unsigned) G.root_ppid
6341 , (unsigned) G.last_bg_pid
6342 , (unsigned) G.last_exitcode
6343 , cnt
6344 , empty_trap_mask
6345 IF_HUSH_LOOPS(, G.depth_of_loop)
6346 );
6347# undef NOMMU_HACK_FMT
6348 /* 1:hush 2:-$<pid>:<pid>:<exitcode>:<etc...> <vars...> <funcs...>
6349 * 3:-c 4:<cmd> 5:<arg0> <argN...> 6:NULL
6350 */
6351 cnt += 6;
6352 for (cur = G.top_var; cur; cur = cur->next) {
6353 if (!cur->flg_export || cur->flg_read_only)
6354 cnt += 2;
6355 }
6356# if ENABLE_HUSH_FUNCTIONS
6357 for (funcp = G.top_func; funcp; funcp = funcp->next)
6358 cnt += 3;
6359# endif
6360 pp = g_argv;
6361 while (*pp++)
6362 cnt++;
6363 *to_free = argv = pp = xzalloc(sizeof(argv[0]) * cnt);
6364 *pp++ = (char *) G.argv0_for_re_execing;
6365 *pp++ = param_buf;
6366 for (cur = G.top_var; cur; cur = cur->next) {
6367 if (strcmp(cur->varstr, hush_version_str) == 0)
6368 continue;
6369 if (cur->flg_read_only) {
6370 *pp++ = (char *) "-R";
6371 *pp++ = cur->varstr;
6372 } else if (!cur->flg_export) {
6373 *pp++ = (char *) "-V";
6374 *pp++ = cur->varstr;
6375 }
6376 }
6377# if ENABLE_HUSH_FUNCTIONS
6378 for (funcp = G.top_func; funcp; funcp = funcp->next) {
6379 *pp++ = (char *) "-F";
6380 *pp++ = funcp->name;
6381 *pp++ = funcp->body_as_string;
6382 }
6383# endif
6384 /* We can pass activated traps here. Say, -Tnn:trap_string
6385 *
6386 * However, POSIX says that subshells reset signals with traps
6387 * to SIG_DFL.
6388 * I tested bash-3.2 and it not only does that with true subshells
6389 * of the form ( list ), but with any forked children shells.
6390 * I set trap "echo W" WINCH; and then tried:
6391 *
6392 * { echo 1; sleep 20; echo 2; } &
6393 * while true; do echo 1; sleep 20; echo 2; break; done &
6394 * true | { echo 1; sleep 20; echo 2; } | cat
6395 *
6396 * In all these cases sending SIGWINCH to the child shell
6397 * did not run the trap. If I add trap "echo V" WINCH;
6398 * _inside_ group (just before echo 1), it works.
6399 *
6400 * I conclude it means we don't need to pass active traps here.
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006401 */
6402 *pp++ = (char *) "-c";
6403 *pp++ = (char *) s;
6404 if (builtin_argv) {
6405 while (*++builtin_argv)
6406 *pp++ = *builtin_argv;
6407 *pp++ = (char *) "";
6408 }
6409 *pp++ = g_argv0;
6410 while (*g_argv)
6411 *pp++ = *g_argv++;
6412 /* *pp = NULL; - is already there */
6413 pp = environ;
6414
6415 do_exec:
6416 debug_printf_exec("re_execute_shell pid:%d cmd:'%s'\n", getpid(), s);
Denys Vlasenko75e77de2011-05-12 13:12:47 +02006417 /* Don't propagate SIG_IGN to the child */
6418 if (SPECIAL_JOBSTOP_SIGS != 0)
6419 switch_off_special_sigs(G.special_sig_mask & SPECIAL_JOBSTOP_SIGS);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006420 execve(bb_busybox_exec_path, argv, pp);
6421 /* Fallback. Useful for init=/bin/hush usage etc */
6422 if (argv[0][0] == '/')
6423 execve(argv[0], argv, pp);
6424 xfunc_error_retval = 127;
6425 bb_error_msg_and_die("can't re-execute the shell");
6426}
6427#endif /* !BB_MMU */
6428
6429
6430static int run_and_free_list(struct pipe *pi);
6431
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00006432/* Executing from string: eval, sh -c '...'
Denis Vlasenkob6e65562009-04-03 16:49:04 +00006433 * or from file: /etc/profile, . file, sh <script>, sh (intereactive)
6434 * end_trigger controls how often we stop parsing
6435 * NUL: parse all, execute, return
6436 * ';': parse till ';' or newline, execute, repeat till EOF
6437 */
6438static void parse_and_run_stream(struct in_str *inp, int end_trigger)
Eric Andersen25f27032001-04-26 23:22:31 +00006439{
Denys Vlasenko00243b02009-11-16 02:00:03 +01006440 /* Why we need empty flag?
6441 * An obscure corner case "false; ``; echo $?":
6442 * empty command in `` should still set $? to 0.
6443 * But we can't just set $? to 0 at the start,
6444 * this breaks "false; echo `echo $?`" case.
6445 */
6446 bool empty = 1;
Denis Vlasenkob6e65562009-04-03 16:49:04 +00006447 while (1) {
6448 struct pipe *pipe_list;
Denis Vlasenkof8d01d32008-06-14 17:13:20 +00006449
Denys Vlasenkoa1463192011-01-18 17:55:04 +01006450#if ENABLE_HUSH_INTERACTIVE
6451 if (end_trigger == ';')
6452 inp->promptmode = 0; /* PS1 */
6453#endif
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00006454 pipe_list = parse_stream(NULL, inp, end_trigger);
Denys Vlasenkocecbc982011-03-30 18:54:52 +02006455 if (!pipe_list || pipe_list == ERR_PTR) { /* EOF/error */
6456 /* If we are in "big" script
6457 * (not in `cmd` or something similar)...
6458 */
6459 if (pipe_list == ERR_PTR && end_trigger == ';') {
6460 /* Discard cached input (rest of line) */
6461 int ch = inp->last_char;
6462 while (ch != EOF && ch != '\n') {
6463 //bb_error_msg("Discarded:'%c'", ch);
6464 ch = i_getch(inp);
6465 }
6466 /* Force prompt */
6467 inp->p = NULL;
6468 /* This stream isn't empty */
6469 empty = 0;
6470 continue;
6471 }
6472 if (!pipe_list && empty)
Denys Vlasenko00243b02009-11-16 02:00:03 +01006473 G.last_exitcode = 0;
Denis Vlasenkob6e65562009-04-03 16:49:04 +00006474 break;
Denys Vlasenko00243b02009-11-16 02:00:03 +01006475 }
Denis Vlasenkob6e65562009-04-03 16:49:04 +00006476 debug_print_tree(pipe_list, 0);
6477 debug_printf_exec("parse_and_run_stream: run_and_free_list\n");
6478 run_and_free_list(pipe_list);
Denys Vlasenko00243b02009-11-16 02:00:03 +01006479 empty = 0;
Denys Vlasenko04b46bc2016-10-01 22:28:03 +02006480 if (G_flag_return_in_progress == 1)
Denys Vlasenko68d5cb52011-03-24 02:50:03 +01006481 break;
Denis Vlasenkob6e65562009-04-03 16:49:04 +00006482 }
Eric Andersen25f27032001-04-26 23:22:31 +00006483}
6484
Denis Vlasenkob6e65562009-04-03 16:49:04 +00006485static void parse_and_run_string(const char *s)
Eric Andersen25f27032001-04-26 23:22:31 +00006486{
6487 struct in_str input;
6488 setup_string_in_str(&input, s);
Denis Vlasenkob6e65562009-04-03 16:49:04 +00006489 parse_and_run_stream(&input, '\0');
Eric Andersen25f27032001-04-26 23:22:31 +00006490}
6491
Denis Vlasenkob6e65562009-04-03 16:49:04 +00006492static void parse_and_run_file(FILE *f)
Eric Andersen25f27032001-04-26 23:22:31 +00006493{
Eric Andersen25f27032001-04-26 23:22:31 +00006494 struct in_str input;
6495 setup_file_in_str(&input, f);
Denis Vlasenkob6e65562009-04-03 16:49:04 +00006496 parse_and_run_stream(&input, ';');
Eric Andersen25f27032001-04-26 23:22:31 +00006497}
6498
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006499#if ENABLE_HUSH_TICK
6500static FILE *generate_stream_from_string(const char *s, pid_t *pid_p)
6501{
6502 pid_t pid;
6503 int channel[2];
6504# if !BB_MMU
6505 char **to_free = NULL;
6506# endif
6507
6508 xpipe(channel);
6509 pid = BB_MMU ? xfork() : xvfork();
6510 if (pid == 0) { /* child */
6511 disable_restore_tty_pgrp_on_exit();
6512 /* Process substitution is not considered to be usual
6513 * 'command execution'.
6514 * SUSv3 says ctrl-Z should be ignored, ctrl-C should not.
6515 */
6516 bb_signals(0
6517 + (1 << SIGTSTP)
6518 + (1 << SIGTTIN)
6519 + (1 << SIGTTOU)
6520 , SIG_IGN);
6521 CLEAR_RANDOM_T(&G.random_gen); /* or else $RANDOM repeats in child */
6522 close(channel[0]); /* NB: close _first_, then move fd! */
6523 xmove_fd(channel[1], 1);
6524 /* Prevent it from trying to handle ctrl-z etc */
6525 IF_HUSH_JOB(G.run_list_level = 1;)
Denys Vlasenko7a85c602017-01-08 17:40:18 +01006526# if ENABLE_HUSH_TRAP
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006527 /* Awful hack for `trap` or $(trap).
6528 *
6529 * http://www.opengroup.org/onlinepubs/009695399/utilities/trap.html
6530 * contains an example where "trap" is executed in a subshell:
6531 *
6532 * save_traps=$(trap)
6533 * ...
6534 * eval "$save_traps"
6535 *
6536 * Standard does not say that "trap" in subshell shall print
6537 * parent shell's traps. It only says that its output
6538 * must have suitable form, but then, in the above example
6539 * (which is not supposed to be normative), it implies that.
6540 *
6541 * bash (and probably other shell) does implement it
6542 * (traps are reset to defaults, but "trap" still shows them),
6543 * but as a result, "trap" logic is hopelessly messed up:
6544 *
6545 * # trap
6546 * trap -- 'echo Ho' SIGWINCH <--- we have a handler
6547 * # (trap) <--- trap is in subshell - no output (correct, traps are reset)
6548 * # true | trap <--- trap is in subshell - no output (ditto)
6549 * # echo `true | trap` <--- in subshell - output (but traps are reset!)
6550 * trap -- 'echo Ho' SIGWINCH
6551 * # echo `(trap)` <--- in subshell in subshell - output
6552 * trap -- 'echo Ho' SIGWINCH
6553 * # echo `true | (trap)` <--- in subshell in subshell in subshell - output!
6554 * trap -- 'echo Ho' SIGWINCH
6555 *
6556 * The rules when to forget and when to not forget traps
6557 * get really complex and nonsensical.
6558 *
6559 * Our solution: ONLY bare $(trap) or `trap` is special.
6560 */
6561 s = skip_whitespace(s);
Denys Vlasenko8dff01d2015-03-12 17:48:34 +01006562 if (is_prefixed_with(s, "trap")
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006563 && skip_whitespace(s + 4)[0] == '\0'
6564 ) {
6565 static const char *const argv[] = { NULL, NULL };
6566 builtin_trap((char**)argv);
Denys Vlasenkoe9abe752016-08-19 20:15:26 +02006567 fflush_all(); /* important */
6568 _exit(0);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006569 }
Denys Vlasenko7a85c602017-01-08 17:40:18 +01006570# endif
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006571# if BB_MMU
6572 reset_traps_to_defaults();
6573 parse_and_run_string(s);
6574 _exit(G.last_exitcode);
6575# else
6576 /* We re-execute after vfork on NOMMU. This makes this script safe:
6577 * yes "0123456789012345678901234567890" | dd bs=32 count=64k >BIG
6578 * huge=`cat BIG` # was blocking here forever
6579 * echo OK
6580 */
6581 re_execute_shell(&to_free,
6582 s,
6583 G.global_argv[0],
6584 G.global_argv + 1,
6585 NULL);
6586# endif
6587 }
6588
6589 /* parent */
6590 *pid_p = pid;
6591# if ENABLE_HUSH_FAST
6592 G.count_SIGCHLD++;
6593//bb_error_msg("[%d] fork in generate_stream_from_string:"
6594// " G.count_SIGCHLD:%d G.handled_SIGCHLD:%d",
6595// getpid(), G.count_SIGCHLD, G.handled_SIGCHLD);
6596# endif
6597 enable_restore_tty_pgrp_on_exit();
6598# if !BB_MMU
6599 free(to_free);
6600# endif
6601 close(channel[1]);
Denys Vlasenko7b25b1c2016-08-20 15:58:34 +02006602 return remember_FILE(xfdopen_for_read(channel[0]));
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006603}
6604
6605/* Return code is exit status of the process that is run. */
6606static int process_command_subs(o_string *dest, const char *s)
6607{
6608 FILE *fp;
6609 struct in_str pipe_str;
6610 pid_t pid;
6611 int status, ch, eol_cnt;
6612
6613 fp = generate_stream_from_string(s, &pid);
6614
6615 /* Now send results of command back into original context */
6616 setup_file_in_str(&pipe_str, fp);
6617 eol_cnt = 0;
6618 while ((ch = i_getch(&pipe_str)) != EOF) {
6619 if (ch == '\n') {
6620 eol_cnt++;
6621 continue;
6622 }
6623 while (eol_cnt) {
6624 o_addchr(dest, '\n');
6625 eol_cnt--;
6626 }
6627 o_addQchr(dest, ch);
6628 }
6629
6630 debug_printf("done reading from `cmd` pipe, closing it\n");
Denys Vlasenko7b25b1c2016-08-20 15:58:34 +02006631 fclose_and_forget(fp);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006632 /* We need to extract exitcode. Test case
6633 * "true; echo `sleep 1; false` $?"
6634 * should print 1 */
6635 safe_waitpid(pid, &status, 0);
6636 debug_printf("child exited. returning its exitcode:%d\n", WEXITSTATUS(status));
6637 return WEXITSTATUS(status);
6638}
6639#endif /* ENABLE_HUSH_TICK */
6640
6641
6642static void setup_heredoc(struct redir_struct *redir)
6643{
6644 struct fd_pair pair;
6645 pid_t pid;
6646 int len, written;
6647 /* the _body_ of heredoc (misleading field name) */
6648 const char *heredoc = redir->rd_filename;
6649 char *expanded;
6650#if !BB_MMU
6651 char **to_free;
6652#endif
6653
6654 expanded = NULL;
6655 if (!(redir->rd_dup & HEREDOC_QUOTED)) {
Denys Vlasenkod98e5c62010-09-10 10:44:23 +02006656 expanded = encode_then_expand_string(heredoc, /*process_bkslash:*/ 1, /*unbackslash:*/ 1);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006657 if (expanded)
6658 heredoc = expanded;
6659 }
6660 len = strlen(heredoc);
6661
6662 close(redir->rd_fd); /* often saves dup2+close in xmove_fd */
6663 xpiped_pair(pair);
6664 xmove_fd(pair.rd, redir->rd_fd);
6665
6666 /* Try writing without forking. Newer kernels have
6667 * dynamically growing pipes. Must use non-blocking write! */
6668 ndelay_on(pair.wr);
6669 while (1) {
6670 written = write(pair.wr, heredoc, len);
6671 if (written <= 0)
6672 break;
6673 len -= written;
6674 if (len == 0) {
6675 close(pair.wr);
6676 free(expanded);
6677 return;
6678 }
6679 heredoc += written;
6680 }
6681 ndelay_off(pair.wr);
6682
6683 /* Okay, pipe buffer was not big enough */
6684 /* Note: we must not create a stray child (bastard? :)
6685 * for the unsuspecting parent process. Child creates a grandchild
6686 * and exits before parent execs the process which consumes heredoc
6687 * (that exec happens after we return from this function) */
6688#if !BB_MMU
6689 to_free = NULL;
6690#endif
6691 pid = xvfork();
6692 if (pid == 0) {
6693 /* child */
6694 disable_restore_tty_pgrp_on_exit();
6695 pid = BB_MMU ? xfork() : xvfork();
6696 if (pid != 0)
6697 _exit(0);
6698 /* grandchild */
6699 close(redir->rd_fd); /* read side of the pipe */
6700#if BB_MMU
6701 full_write(pair.wr, heredoc, len); /* may loop or block */
6702 _exit(0);
6703#else
6704 /* Delegate blocking writes to another process */
6705 xmove_fd(pair.wr, STDOUT_FILENO);
6706 re_execute_shell(&to_free, heredoc, NULL, NULL, NULL);
6707#endif
6708 }
6709 /* parent */
6710#if ENABLE_HUSH_FAST
6711 G.count_SIGCHLD++;
6712//bb_error_msg("[%d] fork in setup_heredoc: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD);
6713#endif
6714 enable_restore_tty_pgrp_on_exit();
6715#if !BB_MMU
6716 free(to_free);
6717#endif
6718 close(pair.wr);
6719 free(expanded);
6720 wait(NULL); /* wait till child has died */
6721}
6722
Denys Vlasenko2db74612017-07-07 22:07:28 +02006723struct squirrel {
6724 int orig_fd;
6725 int moved_to;
6726 /* moved_to = n: fd was moved to n; restore back to orig_fd after redir */
6727 /* moved_to = -1: fd was opened by redirect; close orig_fd after redir */
6728};
6729
Denys Vlasenko621fc502017-07-24 12:42:17 +02006730static struct squirrel *append_squirrel(struct squirrel *sq, int i, int orig, int moved)
6731{
6732 sq = xrealloc(sq, (i + 2) * sizeof(sq[0]));
6733 sq[i].orig_fd = orig;
6734 sq[i].moved_to = moved;
6735 sq[i+1].orig_fd = -1; /* end marker */
6736 return sq;
6737}
6738
Denys Vlasenko2db74612017-07-07 22:07:28 +02006739static struct squirrel *add_squirrel(struct squirrel *sq, int fd, int avoid_fd)
6740{
Denys Vlasenko621fc502017-07-24 12:42:17 +02006741 int moved_to;
Denys Vlasenko32fdf2f2017-07-31 04:32:06 +02006742 int i;
Denys Vlasenko2db74612017-07-07 22:07:28 +02006743
Denys Vlasenkod16e6122017-08-11 15:41:39 +02006744 i = 0;
6745 if (sq) for (; sq[i].orig_fd >= 0; i++) {
Denys Vlasenko2db74612017-07-07 22:07:28 +02006746 /* If we collide with an already moved fd... */
6747 if (fd == sq[i].moved_to) {
6748 sq[i].moved_to = fcntl_F_DUPFD(sq[i].moved_to, avoid_fd);
6749 debug_printf_redir("redirect_fd %d: already busy, moving to %d\n", fd, sq[i].moved_to);
6750 if (sq[i].moved_to < 0) /* what? */
6751 xfunc_die();
6752 return sq;
6753 }
6754 if (fd == sq[i].orig_fd) {
6755 /* Example: echo Hello >/dev/null 1>&2 */
6756 debug_printf_redir("redirect_fd %d: already moved\n", fd);
6757 return sq;
6758 }
Denys Vlasenko2db74612017-07-07 22:07:28 +02006759 }
6760
Denys Vlasenko2db74612017-07-07 22:07:28 +02006761 /* If this fd is open, we move and remember it; if it's closed, moved_to = -1 */
Denys Vlasenko621fc502017-07-24 12:42:17 +02006762 moved_to = fcntl_F_DUPFD(fd, avoid_fd);
6763 debug_printf_redir("redirect_fd %d: previous fd is moved to %d (-1 if it was closed)\n", fd, moved_to);
6764 if (moved_to < 0 && errno != EBADF)
Denys Vlasenko2db74612017-07-07 22:07:28 +02006765 xfunc_die();
Denys Vlasenko621fc502017-07-24 12:42:17 +02006766 return append_squirrel(sq, i, fd, moved_to);
Denys Vlasenko2db74612017-07-07 22:07:28 +02006767}
6768
Denys Vlasenko657e9002017-07-30 23:34:04 +02006769static struct squirrel *add_squirrel_closed(struct squirrel *sq, int fd)
6770{
6771 int i;
6772
Denys Vlasenkod16e6122017-08-11 15:41:39 +02006773 i = 0;
6774 if (sq) for (; sq[i].orig_fd >= 0; i++) {
Denys Vlasenko657e9002017-07-30 23:34:04 +02006775 /* If we collide with an already moved fd... */
6776 if (fd == sq[i].orig_fd) {
6777 /* Examples:
6778 * "echo 3>FILE 3>&- 3>FILE"
6779 * "echo 3>&- 3>FILE"
6780 * No need for last redirect to insert
6781 * another "need to close 3" indicator.
6782 */
6783 debug_printf_redir("redirect_fd %d: already moved or closed\n", fd);
6784 return sq;
6785 }
Denys Vlasenko657e9002017-07-30 23:34:04 +02006786 }
6787
6788 debug_printf_redir("redirect_fd %d: previous fd was closed\n", fd);
6789 return append_squirrel(sq, i, fd, -1);
6790}
6791
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02006792/* fd: redirect wants this fd to be used (e.g. 3>file).
6793 * Move all conflicting internally used fds,
6794 * and remember them so that we can restore them later.
6795 */
Denys Vlasenko657e9002017-07-30 23:34:04 +02006796static int save_fd_on_redirect(int fd, int avoid_fd, struct squirrel **sqp)
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02006797{
Denys Vlasenko2db74612017-07-07 22:07:28 +02006798 if (avoid_fd < 9) /* the important case here is that it can be -1 */
6799 avoid_fd = 9;
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02006800
6801#if ENABLE_HUSH_INTERACTIVE
Denys Vlasenko32fdf2f2017-07-31 04:32:06 +02006802 if (fd == G.interactive_fd) {
6803 /* Testcase: "ls -l /proc/$$/fd 255>&-" should work */
Denys Vlasenko657e9002017-07-30 23:34:04 +02006804 G.interactive_fd = xdup_CLOEXEC_and_close(G.interactive_fd, avoid_fd);
Denys Vlasenko2db74612017-07-07 22:07:28 +02006805 debug_printf_redir("redirect_fd %d: matches interactive_fd, moving it to %d\n", fd, G.interactive_fd);
6806 return 1; /* "we closed fd" */
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02006807 }
6808#endif
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02006809 /* Are we called from setup_redirects(squirrel==NULL)? Two cases:
6810 * (1) Redirect in a forked child. No need to save FILEs' fds,
6811 * we aren't going to use them anymore, ok to trash.
Denys Vlasenko2db74612017-07-07 22:07:28 +02006812 * (2) "exec 3>FILE". Bummer. We can save script FILEs' fds,
6813 * but how are we doing to restore them?
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02006814 * "fileno(fd) = new_fd" can't be done.
6815 */
Denys Vlasenko2db74612017-07-07 22:07:28 +02006816 if (!sqp)
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02006817 return 0;
6818
Denys Vlasenko2db74612017-07-07 22:07:28 +02006819 /* If this one of script's fds? */
6820 if (save_FILEs_on_redirect(fd, avoid_fd))
6821 return 1; /* yes. "we closed fd" */
6822
6823 /* Check whether it collides with any open fds (e.g. stdio), save fds as needed */
6824 *sqp = add_squirrel(*sqp, fd, avoid_fd);
6825 return 0; /* "we did not close fd" */
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02006826}
6827
Denys Vlasenko2db74612017-07-07 22:07:28 +02006828static void restore_redirects(struct squirrel *sq)
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02006829{
Denys Vlasenko2db74612017-07-07 22:07:28 +02006830 if (sq) {
Denys Vlasenko32fdf2f2017-07-31 04:32:06 +02006831 int i;
6832 for (i = 0; sq[i].orig_fd >= 0; i++) {
Denys Vlasenko2db74612017-07-07 22:07:28 +02006833 if (sq[i].moved_to >= 0) {
6834 /* We simply die on error */
6835 debug_printf_redir("restoring redirected fd from %d to %d\n", sq[i].moved_to, sq[i].orig_fd);
6836 xmove_fd(sq[i].moved_to, sq[i].orig_fd);
6837 } else {
6838 /* cmd1 9>FILE; cmd2_should_see_fd9_closed */
6839 debug_printf_redir("restoring redirected fd %d: closing it\n", sq[i].orig_fd);
6840 close(sq[i].orig_fd);
6841 }
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02006842 }
Denys Vlasenko2db74612017-07-07 22:07:28 +02006843 free(sq);
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02006844 }
6845
Denys Vlasenko2db74612017-07-07 22:07:28 +02006846 /* If moved, G.interactive_fd stays on new fd, not restoring it */
Denys Vlasenkoaa3576a2016-08-22 19:54:12 +02006847
6848 restore_redirected_FILEs();
6849}
6850
Denys Vlasenkobf1c3442017-07-31 04:54:53 +02006851#if ENABLE_FEATURE_SH_STANDALONE && BB_MMU
Denys Vlasenko5b3d2eb2017-07-31 18:02:28 +02006852static void close_saved_fds_and_FILE_fds(void)
Denys Vlasenkobf1c3442017-07-31 04:54:53 +02006853{
6854 if (G_interactive_fd)
6855 close(G_interactive_fd);
6856 close_all_FILE_list();
6857}
6858#endif
6859
Denys Vlasenko32fdf2f2017-07-31 04:32:06 +02006860static int internally_opened_fd(int fd, struct squirrel *sq)
6861{
6862 int i;
6863
6864#if ENABLE_HUSH_INTERACTIVE
6865 if (fd == G.interactive_fd)
6866 return 1;
6867#endif
6868 /* If this one of script's fds? */
6869 if (fd_in_FILEs(fd))
6870 return 1;
6871
6872 if (sq) for (i = 0; sq[i].orig_fd >= 0; i++) {
6873 if (fd == sq[i].moved_to)
6874 return 1;
6875 }
6876 return 0;
6877}
6878
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006879/* squirrel != NULL means we squirrel away copies of stdin, stdout,
6880 * and stderr if they are redirected. */
Denys Vlasenko2db74612017-07-07 22:07:28 +02006881static int setup_redirects(struct command *prog, struct squirrel **sqp)
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006882{
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006883 struct redir_struct *redir;
6884
6885 for (redir = prog->redirects; redir; redir = redir->next) {
Denys Vlasenko657e9002017-07-30 23:34:04 +02006886 int newfd;
6887 int closed;
6888
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006889 if (redir->rd_type == REDIRECT_HEREDOC2) {
Denys Vlasenko869994c2016-08-20 15:16:00 +02006890 /* "rd_fd<<HERE" case */
Denys Vlasenko657e9002017-07-30 23:34:04 +02006891 save_fd_on_redirect(redir->rd_fd, /*avoid:*/ 0, sqp);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006892 /* for REDIRECT_HEREDOC2, rd_filename holds _contents_
6893 * of the heredoc */
6894 debug_printf_parse("set heredoc '%s'\n",
6895 redir->rd_filename);
6896 setup_heredoc(redir);
6897 continue;
6898 }
6899
6900 if (redir->rd_dup == REDIRFD_TO_FILE) {
Denys Vlasenko869994c2016-08-20 15:16:00 +02006901 /* "rd_fd<*>file" case (<*> is <,>,>>,<>) */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006902 char *p;
Denys Vlasenko657e9002017-07-30 23:34:04 +02006903 int mode;
6904
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006905 if (redir->rd_filename == NULL) {
Denys Vlasenkod6a37d82016-09-20 16:22:24 +02006906 /*
6907 * Examples:
6908 * "cmd >" (no filename)
6909 * "cmd > <file" (2nd redirect starts too early)
6910 */
Denys Vlasenko39701202017-08-02 19:44:05 +02006911 syntax_error("invalid redirect");
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006912 continue;
6913 }
6914 mode = redir_table[redir->rd_type].mode;
Denys Vlasenkoebee4102010-09-10 10:17:53 +02006915 p = expand_string_to_string(redir->rd_filename, /*unbackslash:*/ 1);
Denys Vlasenko657e9002017-07-30 23:34:04 +02006916 newfd = open_or_warn(p, mode);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006917 free(p);
Denys Vlasenko657e9002017-07-30 23:34:04 +02006918 if (newfd < 0) {
Denys Vlasenko869994c2016-08-20 15:16:00 +02006919 /* Error message from open_or_warn can be lost
6920 * if stderr has been redirected, but bash
6921 * and ash both lose it as well
6922 * (though zsh doesn't!)
6923 */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006924 return 1;
6925 }
Denys Vlasenko657e9002017-07-30 23:34:04 +02006926 if (newfd == redir->rd_fd && sqp) {
Denys Vlasenko621fc502017-07-24 12:42:17 +02006927 /* open() gave us precisely the fd we wanted.
6928 * This means that this fd was not busy
6929 * (not opened to anywhere).
6930 * Remember to close it on restore:
6931 */
Denys Vlasenko657e9002017-07-30 23:34:04 +02006932 *sqp = add_squirrel_closed(*sqp, newfd);
6933 debug_printf_redir("redir to previously closed fd %d\n", newfd);
Denys Vlasenko621fc502017-07-24 12:42:17 +02006934 }
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006935 } else {
Denys Vlasenko657e9002017-07-30 23:34:04 +02006936 /* "rd_fd>&rd_dup" or "rd_fd>&-" case */
6937 newfd = redir->rd_dup;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006938 }
6939
Denys Vlasenko657e9002017-07-30 23:34:04 +02006940 if (newfd == redir->rd_fd)
6941 continue;
6942
6943 /* if "N>FILE": move newfd to redir->rd_fd */
6944 /* if "N>&M": dup newfd to redir->rd_fd */
6945 /* if "N>&-": close redir->rd_fd (newfd is REDIRFD_CLOSE) */
6946
6947 closed = save_fd_on_redirect(redir->rd_fd, /*avoid:*/ newfd, sqp);
6948 if (newfd == REDIRFD_CLOSE) {
6949 /* "N>&-" means "close me" */
6950 if (!closed) {
6951 /* ^^^ optimization: saving may already
6952 * have closed it. If not... */
6953 close(redir->rd_fd);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006954 }
Denys Vlasenko657e9002017-07-30 23:34:04 +02006955 /* Sometimes we do another close on restore, getting EBADF.
6956 * Consider "echo 3>FILE 3>&-"
6957 * first redirect remembers "need to close 3",
6958 * and second redirect closes 3! Restore code then closes 3 again.
6959 */
6960 } else {
Denys Vlasenko32fdf2f2017-07-31 04:32:06 +02006961 /* if newfd is a script fd or saved fd, simulate EBADF */
6962 if (internally_opened_fd(newfd, sqp ? *sqp : NULL)) {
6963 //errno = EBADF;
6964 //bb_perror_msg_and_die("can't duplicate file descriptor");
6965 newfd = -1; /* same effect as code above */
6966 }
Denys Vlasenko657e9002017-07-30 23:34:04 +02006967 xdup2(newfd, redir->rd_fd);
6968 if (redir->rd_dup == REDIRFD_TO_FILE)
6969 /* "rd_fd > FILE" */
6970 close(newfd);
6971 /* else: "rd_fd > rd_dup" */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006972 }
6973 }
6974 return 0;
6975}
6976
Denys Vlasenkob36abf22010-09-05 14:50:59 +02006977static char *find_in_path(const char *arg)
6978{
6979 char *ret = NULL;
6980 const char *PATH = get_local_var_value("PATH");
6981
6982 if (!PATH)
6983 return NULL;
6984
6985 while (1) {
6986 const char *end = strchrnul(PATH, ':');
6987 int sz = end - PATH; /* must be int! */
6988
6989 free(ret);
6990 if (sz != 0) {
6991 ret = xasprintf("%.*s/%s", sz, PATH, arg);
6992 } else {
6993 /* We have xxx::yyyy in $PATH,
6994 * it means "use current dir" */
6995 ret = xstrdup(arg);
6996 }
6997 if (access(ret, F_OK) == 0)
6998 break;
6999
7000 if (*end == '\0') {
7001 free(ret);
7002 return NULL;
7003 }
7004 PATH = end + 1;
7005 }
7006
7007 return ret;
7008}
7009
Denys Vlasenkoda463fb2010-09-07 09:53:50 +02007010static const struct built_in_command *find_builtin_helper(const char *name,
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007011 const struct built_in_command *x,
7012 const struct built_in_command *end)
7013{
7014 while (x != end) {
7015 if (strcmp(name, x->b_cmd) != 0) {
7016 x++;
7017 continue;
7018 }
7019 debug_printf_exec("found builtin '%s'\n", name);
7020 return x;
7021 }
7022 return NULL;
7023}
Denys Vlasenkoda463fb2010-09-07 09:53:50 +02007024static const struct built_in_command *find_builtin1(const char *name)
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007025{
7026 return find_builtin_helper(name, bltins1, &bltins1[ARRAY_SIZE(bltins1)]);
7027}
Denys Vlasenkoda463fb2010-09-07 09:53:50 +02007028static const struct built_in_command *find_builtin(const char *name)
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007029{
7030 const struct built_in_command *x = find_builtin1(name);
7031 if (x)
7032 return x;
7033 return find_builtin_helper(name, bltins2, &bltins2[ARRAY_SIZE(bltins2)]);
7034}
7035
7036#if ENABLE_HUSH_FUNCTIONS
7037static struct function **find_function_slot(const char *name)
7038{
7039 struct function **funcpp = &G.top_func;
7040 while (*funcpp) {
7041 if (strcmp(name, (*funcpp)->name) == 0) {
7042 break;
7043 }
7044 funcpp = &(*funcpp)->next;
7045 }
7046 return funcpp;
7047}
7048
7049static const struct function *find_function(const char *name)
7050{
7051 const struct function *funcp = *find_function_slot(name);
7052 if (funcp)
7053 debug_printf_exec("found function '%s'\n", name);
7054 return funcp;
7055}
7056
7057/* Note: takes ownership on name ptr */
7058static struct function *new_function(char *name)
7059{
7060 struct function **funcpp = find_function_slot(name);
7061 struct function *funcp = *funcpp;
7062
7063 if (funcp != NULL) {
7064 struct command *cmd = funcp->parent_cmd;
7065 debug_printf_exec("func %p parent_cmd %p\n", funcp, cmd);
7066 if (!cmd) {
7067 debug_printf_exec("freeing & replacing function '%s'\n", funcp->name);
7068 free(funcp->name);
7069 /* Note: if !funcp->body, do not free body_as_string!
7070 * This is a special case of "-F name body" function:
7071 * body_as_string was not malloced! */
7072 if (funcp->body) {
7073 free_pipe_list(funcp->body);
7074# if !BB_MMU
7075 free(funcp->body_as_string);
7076# endif
7077 }
7078 } else {
7079 debug_printf_exec("reinserting in tree & replacing function '%s'\n", funcp->name);
7080 cmd->argv[0] = funcp->name;
7081 cmd->group = funcp->body;
7082# if !BB_MMU
7083 cmd->group_as_string = funcp->body_as_string;
7084# endif
7085 }
7086 } else {
7087 debug_printf_exec("remembering new function '%s'\n", name);
7088 funcp = *funcpp = xzalloc(sizeof(*funcp));
7089 /*funcp->next = NULL;*/
7090 }
7091
7092 funcp->name = name;
7093 return funcp;
7094}
7095
Denys Vlasenko10d5ece2017-01-08 18:28:43 +01007096# if ENABLE_HUSH_UNSET
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007097static void unset_func(const char *name)
7098{
7099 struct function **funcpp = find_function_slot(name);
7100 struct function *funcp = *funcpp;
7101
7102 if (funcp != NULL) {
7103 debug_printf_exec("freeing function '%s'\n", funcp->name);
7104 *funcpp = funcp->next;
7105 /* funcp is unlinked now, deleting it.
7106 * Note: if !funcp->body, the function was created by
7107 * "-F name body", do not free ->body_as_string
7108 * and ->name as they were not malloced. */
7109 if (funcp->body) {
7110 free_pipe_list(funcp->body);
7111 free(funcp->name);
Denys Vlasenko10d5ece2017-01-08 18:28:43 +01007112# if !BB_MMU
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007113 free(funcp->body_as_string);
Denys Vlasenko10d5ece2017-01-08 18:28:43 +01007114# endif
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007115 }
7116 free(funcp);
7117 }
7118}
Denys Vlasenko10d5ece2017-01-08 18:28:43 +01007119# endif
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007120
7121# if BB_MMU
7122#define exec_function(to_free, funcp, argv) \
7123 exec_function(funcp, argv)
7124# endif
7125static void exec_function(char ***to_free,
7126 const struct function *funcp,
7127 char **argv) NORETURN;
7128static void exec_function(char ***to_free,
7129 const struct function *funcp,
7130 char **argv)
7131{
7132# if BB_MMU
Denys Vlasenkod4e4fdb2017-07-03 21:31:16 +02007133 int n;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007134
7135 argv[0] = G.global_argv[0];
7136 G.global_argv = argv;
Denys Vlasenkod4e4fdb2017-07-03 21:31:16 +02007137 G.global_argc = n = 1 + string_array_len(argv + 1);
Denys Vlasenko5b3d2eb2017-07-31 18:02:28 +02007138
7139// Example when we are here: "cmd | func"
7140// func will run with saved-redirect fds open.
7141// $ f() { echo /proc/self/fd/*; }
7142// $ true | f
7143// /proc/self/fd/0 /proc/self/fd/1 /proc/self/fd/2 /proc/self/fd/255 /proc/self/fd/3
7144// stdio^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ G_interactive_fd^ DIR fd for glob
7145// Same in script:
7146// $ . ./SCRIPT
7147// /proc/self/fd/0 /proc/self/fd/1 /proc/self/fd/2 /proc/self/fd/255 /proc/self/fd/3 /proc/self/fd/4
7148// stdio^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ G_interactive_fd^ opened ./SCRIPT DIR fd for glob
7149// They are CLOEXEC so external programs won't see them, but
7150// for "more correctness" we might want to close those extra fds here:
7151//? close_saved_fds_and_FILE_fds();
7152
7153 /* "we are in function, ok to use return" */
7154 G_flag_return_in_progress = -1;
7155 IF_HUSH_LOCAL(G.func_nest_level++;)
7156
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007157 /* On MMU, funcp->body is always non-NULL */
7158 n = run_list(funcp->body);
7159 fflush_all();
7160 _exit(n);
7161# else
Denys Vlasenko5b3d2eb2017-07-31 18:02:28 +02007162//? close_saved_fds_and_FILE_fds();
7163
7164//TODO: check whether "true | func_with_return" works
7165
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007166 re_execute_shell(to_free,
7167 funcp->body_as_string,
7168 G.global_argv[0],
7169 argv + 1,
7170 NULL);
7171# endif
7172}
7173
7174static int run_function(const struct function *funcp, char **argv)
7175{
7176 int rc;
7177 save_arg_t sv;
7178 smallint sv_flg;
7179
7180 save_and_replace_G_args(&sv, argv);
7181
7182 /* "we are in function, ok to use return" */
Denys Vlasenko04b46bc2016-10-01 22:28:03 +02007183 sv_flg = G_flag_return_in_progress;
7184 G_flag_return_in_progress = -1;
Denys Vlasenko5b3d2eb2017-07-31 18:02:28 +02007185 IF_HUSH_LOCAL(G.func_nest_level++;)
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007186
7187 /* On MMU, funcp->body is always non-NULL */
7188# if !BB_MMU
7189 if (!funcp->body) {
7190 /* Function defined by -F */
7191 parse_and_run_string(funcp->body_as_string);
7192 rc = G.last_exitcode;
7193 } else
7194# endif
7195 {
7196 rc = run_list(funcp->body);
7197 }
7198
7199# if ENABLE_HUSH_LOCAL
7200 {
7201 struct variable *var;
7202 struct variable **var_pp;
7203
7204 var_pp = &G.top_var;
7205 while ((var = *var_pp) != NULL) {
7206 if (var->func_nest_level < G.func_nest_level) {
7207 var_pp = &var->next;
7208 continue;
7209 }
7210 /* Unexport */
7211 if (var->flg_export)
7212 bb_unsetenv(var->varstr);
7213 /* Remove from global list */
7214 *var_pp = var->next;
7215 /* Free */
7216 if (!var->max_len)
7217 free(var->varstr);
7218 free(var);
7219 }
7220 G.func_nest_level--;
7221 }
7222# endif
Denys Vlasenko04b46bc2016-10-01 22:28:03 +02007223 G_flag_return_in_progress = sv_flg;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007224
7225 restore_G_args(&sv, argv);
7226
7227 return rc;
7228}
7229#endif /* ENABLE_HUSH_FUNCTIONS */
7230
7231
7232#if BB_MMU
7233#define exec_builtin(to_free, x, argv) \
7234 exec_builtin(x, argv)
7235#else
7236#define exec_builtin(to_free, x, argv) \
7237 exec_builtin(to_free, argv)
7238#endif
7239static void exec_builtin(char ***to_free,
7240 const struct built_in_command *x,
7241 char **argv) NORETURN;
7242static void exec_builtin(char ***to_free,
7243 const struct built_in_command *x,
7244 char **argv)
7245{
7246#if BB_MMU
Denys Vlasenko8ee2ada2011-02-07 02:03:51 +01007247 int rcode;
7248 fflush_all();
Denys Vlasenko5b3d2eb2017-07-31 18:02:28 +02007249//? close_saved_fds_and_FILE_fds();
Denys Vlasenko8ee2ada2011-02-07 02:03:51 +01007250 rcode = x->b_function(argv);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007251 fflush_all();
7252 _exit(rcode);
7253#else
Denys Vlasenko8ee2ada2011-02-07 02:03:51 +01007254 fflush_all();
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007255 /* On NOMMU, we must never block!
7256 * Example: { sleep 99 | read line; } & echo Ok
7257 */
7258 re_execute_shell(to_free,
7259 argv[0],
7260 G.global_argv[0],
7261 G.global_argv + 1,
7262 argv);
7263#endif
7264}
7265
7266
7267static void execvp_or_die(char **argv) NORETURN;
7268static void execvp_or_die(char **argv)
7269{
Denys Vlasenko04465da2016-10-03 01:01:15 +02007270 int e;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007271 debug_printf_exec("execing '%s'\n", argv[0]);
Denys Vlasenko75e77de2011-05-12 13:12:47 +02007272 /* Don't propagate SIG_IGN to the child */
7273 if (SPECIAL_JOBSTOP_SIGS != 0)
7274 switch_off_special_sigs(G.special_sig_mask & SPECIAL_JOBSTOP_SIGS);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007275 execvp(argv[0], argv);
Denys Vlasenko04465da2016-10-03 01:01:15 +02007276 e = 2;
7277 if (errno == EACCES) e = 126;
7278 if (errno == ENOENT) e = 127;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007279 bb_perror_msg("can't execute '%s'", argv[0]);
Denys Vlasenko04465da2016-10-03 01:01:15 +02007280 _exit(e);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007281}
7282
7283#if ENABLE_HUSH_MODE_X
7284static void dump_cmd_in_x_mode(char **argv)
7285{
7286 if (G_x_mode && argv) {
7287 /* We want to output the line in one write op */
7288 char *buf, *p;
7289 int len;
7290 int n;
7291
7292 len = 3;
7293 n = 0;
7294 while (argv[n])
7295 len += strlen(argv[n++]) + 1;
7296 buf = xmalloc(len);
7297 buf[0] = '+';
7298 p = buf + 1;
7299 n = 0;
7300 while (argv[n])
7301 p += sprintf(p, " %s", argv[n++]);
7302 *p++ = '\n';
7303 *p = '\0';
7304 fputs(buf, stderr);
7305 free(buf);
7306 }
7307}
7308#else
7309# define dump_cmd_in_x_mode(argv) ((void)0)
7310#endif
7311
7312#if BB_MMU
7313#define pseudo_exec_argv(nommu_save, argv, assignment_cnt, argv_expanded) \
7314 pseudo_exec_argv(argv, assignment_cnt, argv_expanded)
7315#define pseudo_exec(nommu_save, command, argv_expanded) \
7316 pseudo_exec(command, argv_expanded)
7317#endif
7318
7319/* Called after [v]fork() in run_pipe, or from builtin_exec.
7320 * Never returns.
7321 * Don't exit() here. If you don't exec, use _exit instead.
7322 * The at_exit handlers apparently confuse the calling process,
Denys Vlasenko215b0ca2016-08-19 18:23:56 +02007323 * in particular stdin handling. Not sure why? -- because of vfork! (vda)
Denys Vlasenko215b0ca2016-08-19 18:23:56 +02007324 */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007325static void pseudo_exec_argv(nommu_save_t *nommu_save,
7326 char **argv, int assignment_cnt,
7327 char **argv_expanded) NORETURN;
7328static NOINLINE void pseudo_exec_argv(nommu_save_t *nommu_save,
7329 char **argv, int assignment_cnt,
7330 char **argv_expanded)
7331{
7332 char **new_env;
7333
7334 new_env = expand_assignments(argv, assignment_cnt);
7335 dump_cmd_in_x_mode(new_env);
7336
7337 if (!argv[assignment_cnt]) {
7338 /* Case when we are here: ... | var=val | ...
7339 * (note that we do not exit early, i.e., do not optimize out
7340 * expand_assignments(): think about ... | var=`sleep 1` | ...
7341 */
7342 free_strings(new_env);
7343 _exit(EXIT_SUCCESS);
7344 }
7345
7346#if BB_MMU
7347 set_vars_and_save_old(new_env);
7348 free(new_env); /* optional */
7349 /* we can also destroy set_vars_and_save_old's return value,
7350 * to save memory */
7351#else
7352 nommu_save->new_env = new_env;
7353 nommu_save->old_vars = set_vars_and_save_old(new_env);
7354#endif
7355
7356 if (argv_expanded) {
7357 argv = argv_expanded;
7358 } else {
7359 argv = expand_strvec_to_strvec(argv + assignment_cnt);
7360#if !BB_MMU
7361 nommu_save->argv = argv;
7362#endif
7363 }
7364 dump_cmd_in_x_mode(argv);
7365
7366#if ENABLE_FEATURE_SH_STANDALONE || BB_MMU
7367 if (strchr(argv[0], '/') != NULL)
7368 goto skip;
7369#endif
7370
Denys Vlasenko75481d32017-07-31 05:27:09 +02007371#if ENABLE_HUSH_FUNCTIONS
7372 /* Check if the command matches any functions (this goes before bltins) */
7373 {
7374 const struct function *funcp = find_function(argv[0]);
7375 if (funcp) {
7376 exec_function(&nommu_save->argv_from_re_execing, funcp, argv);
7377 }
7378 }
7379#endif
7380
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007381 /* Check if the command matches any of the builtins.
7382 * Depending on context, this might be redundant. But it's
7383 * easier to waste a few CPU cycles than it is to figure out
7384 * if this is one of those cases.
7385 */
7386 {
7387 /* On NOMMU, it is more expensive to re-execute shell
7388 * just in order to run echo or test builtin.
7389 * It's better to skip it here and run corresponding
7390 * non-builtin later. */
7391 const struct built_in_command *x;
7392 x = BB_MMU ? find_builtin(argv[0]) : find_builtin1(argv[0]);
7393 if (x) {
7394 exec_builtin(&nommu_save->argv_from_re_execing, x, argv);
7395 }
7396 }
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007397
7398#if ENABLE_FEATURE_SH_STANDALONE
7399 /* Check if the command matches any busybox applets */
7400 {
7401 int a = find_applet_by_name(argv[0]);
7402 if (a >= 0) {
7403# if BB_MMU /* see above why on NOMMU it is not allowed */
7404 if (APPLET_IS_NOEXEC(a)) {
Denys Vlasenkobf1c3442017-07-31 04:54:53 +02007405 /* Do not leak open fds from opened script files etc.
7406 * Testcase: interactive "ls -l /proc/self/fd"
7407 * should not show tty fd open.
7408 */
Denys Vlasenko5b3d2eb2017-07-31 18:02:28 +02007409 close_saved_fds_and_FILE_fds();
Denys Vlasenko75481d32017-07-31 05:27:09 +02007410//FIXME: should also close saved redir fds
Denys Vlasenko7c40ddd2017-08-02 16:37:39 +02007411 /* Without this, "rm -i FILE" can't be ^C'ed: */
7412 switch_off_special_sigs(G.special_sig_mask);
Denys Vlasenkoc9c1ccc2017-08-07 18:59:35 +02007413 debug_printf_exec("running applet '%s'\n", argv[0]);
Denys Vlasenko80e8e3c2017-08-07 19:24:57 +02007414 run_noexec_applet_and_exit(a, argv[0], argv);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007415 }
7416# endif
7417 /* Re-exec ourselves */
7418 debug_printf_exec("re-execing applet '%s'\n", argv[0]);
Denys Vlasenko75e77de2011-05-12 13:12:47 +02007419 /* Don't propagate SIG_IGN to the child */
7420 if (SPECIAL_JOBSTOP_SIGS != 0)
7421 switch_off_special_sigs(G.special_sig_mask & SPECIAL_JOBSTOP_SIGS);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007422 execv(bb_busybox_exec_path, argv);
7423 /* If they called chroot or otherwise made the binary no longer
7424 * executable, fall through */
7425 }
7426 }
7427#endif
7428
7429#if ENABLE_FEATURE_SH_STANDALONE || BB_MMU
7430 skip:
7431#endif
7432 execvp_or_die(argv);
7433}
7434
7435/* Called after [v]fork() in run_pipe
7436 */
7437static void pseudo_exec(nommu_save_t *nommu_save,
7438 struct command *command,
7439 char **argv_expanded) NORETURN;
7440static void pseudo_exec(nommu_save_t *nommu_save,
7441 struct command *command,
7442 char **argv_expanded)
7443{
7444 if (command->argv) {
7445 pseudo_exec_argv(nommu_save, command->argv,
7446 command->assignment_cnt, argv_expanded);
7447 }
7448
7449 if (command->group) {
7450 /* Cases when we are here:
7451 * ( list )
7452 * { list } &
7453 * ... | ( list ) | ...
7454 * ... | { list } | ...
7455 */
7456#if BB_MMU
7457 int rcode;
7458 debug_printf_exec("pseudo_exec: run_list\n");
7459 reset_traps_to_defaults();
7460 rcode = run_list(command->group);
7461 /* OK to leak memory by not calling free_pipe_list,
7462 * since this process is about to exit */
7463 _exit(rcode);
7464#else
7465 re_execute_shell(&nommu_save->argv_from_re_execing,
7466 command->group_as_string,
7467 G.global_argv[0],
7468 G.global_argv + 1,
7469 NULL);
7470#endif
7471 }
7472
7473 /* Case when we are here: ... | >file */
7474 debug_printf_exec("pseudo_exec'ed null command\n");
7475 _exit(EXIT_SUCCESS);
7476}
7477
7478#if ENABLE_HUSH_JOB
7479static const char *get_cmdtext(struct pipe *pi)
7480{
7481 char **argv;
7482 char *p;
7483 int len;
7484
7485 /* This is subtle. ->cmdtext is created only on first backgrounding.
7486 * (Think "cat, <ctrl-z>, fg, <ctrl-z>, fg, <ctrl-z>...." here...)
7487 * On subsequent bg argv is trashed, but we won't use it */
7488 if (pi->cmdtext)
7489 return pi->cmdtext;
Denys Vlasenko1eada9a2016-11-08 17:28:45 +01007490
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007491 argv = pi->cmds[0].argv;
Denys Vlasenko1eada9a2016-11-08 17:28:45 +01007492 if (!argv) {
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007493 pi->cmdtext = xzalloc(1);
7494 return pi->cmdtext;
7495 }
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007496 len = 0;
7497 do {
7498 len += strlen(*argv) + 1;
7499 } while (*++argv);
7500 p = xmalloc(len);
7501 pi->cmdtext = p;
7502 argv = pi->cmds[0].argv;
7503 do {
Denys Vlasenko1eada9a2016-11-08 17:28:45 +01007504 p = stpcpy(p, *argv);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007505 *p++ = ' ';
7506 } while (*++argv);
7507 p[-1] = '\0';
7508 return pi->cmdtext;
7509}
7510
Denys Vlasenko2ed74e22017-07-14 19:58:46 +02007511static void remove_job_from_table(struct pipe *pi)
7512{
7513 struct pipe *prev_pipe;
7514
7515 if (pi == G.job_list) {
7516 G.job_list = pi->next;
7517 } else {
7518 prev_pipe = G.job_list;
7519 while (prev_pipe->next != pi)
7520 prev_pipe = prev_pipe->next;
7521 prev_pipe->next = pi->next;
7522 }
7523 G.last_jobid = 0;
7524 if (G.job_list)
7525 G.last_jobid = G.job_list->jobid;
7526}
7527
7528static void delete_finished_job(struct pipe *pi)
7529{
7530 remove_job_from_table(pi);
7531 free_pipe(pi);
7532}
7533
7534static void clean_up_last_dead_job(void)
7535{
7536 if (G.job_list && !G.job_list->alive_cmds)
7537 delete_finished_job(G.job_list);
7538}
7539
Denys Vlasenko16096292017-07-10 10:00:28 +02007540static void insert_job_into_table(struct pipe *pi)
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007541{
7542 struct pipe *job, **jobp;
7543 int i;
7544
Denys Vlasenko2ed74e22017-07-14 19:58:46 +02007545 clean_up_last_dead_job();
7546
Denys Vlasenko9e55a152017-07-10 10:01:12 +02007547 /* Find the end of the list, and find next job ID to use */
7548 i = 0;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007549 jobp = &G.job_list;
Denys Vlasenko9e55a152017-07-10 10:01:12 +02007550 while ((job = *jobp) != NULL) {
7551 if (job->jobid > i)
7552 i = job->jobid;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007553 jobp = &job->next;
Denys Vlasenko9e55a152017-07-10 10:01:12 +02007554 }
7555 pi->jobid = i + 1;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007556
Denys Vlasenko9e55a152017-07-10 10:01:12 +02007557 /* Create a new job struct at the end */
7558 job = *jobp = xmemdup(pi, sizeof(*pi));
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007559 job->next = NULL;
7560 job->cmds = xzalloc(sizeof(pi->cmds[0]) * pi->num_cmds);
7561 /* Cannot copy entire pi->cmds[] vector! This causes double frees */
7562 for (i = 0; i < pi->num_cmds; i++) {
7563 job->cmds[i].pid = pi->cmds[i].pid;
7564 /* all other fields are not used and stay zero */
7565 }
7566 job->cmdtext = xstrdup(get_cmdtext(pi));
7567
7568 if (G_interactive_fd)
Denys Vlasenkod5b5c2f2017-01-08 15:46:04 +01007569 printf("[%u] %u %s\n", job->jobid, (unsigned)job->cmds[0].pid, job->cmdtext);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007570 G.last_jobid = job->jobid;
7571}
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007572#endif /* JOB */
7573
Denys Vlasenko62b717b2016-11-07 22:12:18 +01007574static int job_exited_or_stopped(struct pipe *pi)
7575{
7576 int rcode, i;
7577
7578 if (pi->alive_cmds != pi->stopped_cmds)
7579 return -1;
7580
7581 /* All processes in fg pipe have exited or stopped */
7582 rcode = 0;
7583 i = pi->num_cmds;
7584 while (--i >= 0) {
7585 rcode = pi->cmds[i].cmd_exitcode;
7586 /* usually last process gives overall exitstatus,
7587 * but with "set -o pipefail", last *failed* process does */
7588 if (G.o_opt[OPT_O_PIPEFAIL] == 0 || rcode != 0)
7589 break;
7590 }
7591 IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;)
7592 return rcode;
7593}
7594
Denys Vlasenko7e675362016-10-28 21:57:31 +02007595static int process_wait_result(struct pipe *fg_pipe, pid_t childpid, int status)
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007596{
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007597#if ENABLE_HUSH_JOB
7598 struct pipe *pi;
7599#endif
Denys Vlasenko7e675362016-10-28 21:57:31 +02007600 int i, dead;
7601
7602 dead = WIFEXITED(status) || WIFSIGNALED(status);
7603
7604#if DEBUG_JOBS
7605 if (WIFSTOPPED(status))
7606 debug_printf_jobs("pid %d stopped by sig %d (exitcode %d)\n",
7607 childpid, WSTOPSIG(status), WEXITSTATUS(status));
7608 if (WIFSIGNALED(status))
7609 debug_printf_jobs("pid %d killed by sig %d (exitcode %d)\n",
7610 childpid, WTERMSIG(status), WEXITSTATUS(status));
7611 if (WIFEXITED(status))
7612 debug_printf_jobs("pid %d exited, exitcode %d\n",
7613 childpid, WEXITSTATUS(status));
7614#endif
7615 /* Were we asked to wait for a fg pipe? */
7616 if (fg_pipe) {
7617 i = fg_pipe->num_cmds;
Denys Vlasenko62b717b2016-11-07 22:12:18 +01007618
Denys Vlasenko7e675362016-10-28 21:57:31 +02007619 while (--i >= 0) {
Denys Vlasenko62b717b2016-11-07 22:12:18 +01007620 int rcode;
7621
Denys Vlasenko7e675362016-10-28 21:57:31 +02007622 debug_printf_jobs("check pid %d\n", fg_pipe->cmds[i].pid);
7623 if (fg_pipe->cmds[i].pid != childpid)
7624 continue;
7625 if (dead) {
7626 int ex;
7627 fg_pipe->cmds[i].pid = 0;
7628 fg_pipe->alive_cmds--;
7629 ex = WEXITSTATUS(status);
7630 /* bash prints killer signal's name for *last*
7631 * process in pipe (prints just newline for SIGINT/SIGPIPE).
7632 * Mimic this. Example: "sleep 5" + (^\ or kill -QUIT)
7633 */
7634 if (WIFSIGNALED(status)) {
7635 int sig = WTERMSIG(status);
7636 if (i == fg_pipe->num_cmds-1)
7637 /* TODO: use strsignal() instead for bash compat? but that's bloat... */
7638 puts(sig == SIGINT || sig == SIGPIPE ? "" : get_signame(sig));
7639 /* TODO: if (WCOREDUMP(status)) + " (core dumped)"; */
7640 /* TODO: MIPS has 128 sigs (1..128), what if sig==128 here?
7641 * Maybe we need to use sig | 128? */
7642 ex = sig + 128;
7643 }
7644 fg_pipe->cmds[i].cmd_exitcode = ex;
7645 } else {
7646 fg_pipe->stopped_cmds++;
7647 }
7648 debug_printf_jobs("fg_pipe: alive_cmds %d stopped_cmds %d\n",
7649 fg_pipe->alive_cmds, fg_pipe->stopped_cmds);
Denys Vlasenko62b717b2016-11-07 22:12:18 +01007650 rcode = job_exited_or_stopped(fg_pipe);
7651 if (rcode >= 0) {
Denys Vlasenko7e675362016-10-28 21:57:31 +02007652/* Note: *non-interactive* bash does not continue if all processes in fg pipe
7653 * are stopped. Testcase: "cat | cat" in a script (not on command line!)
7654 * and "killall -STOP cat" */
7655 if (G_interactive_fd) {
7656#if ENABLE_HUSH_JOB
7657 if (fg_pipe->alive_cmds != 0)
Denys Vlasenko16096292017-07-10 10:00:28 +02007658 insert_job_into_table(fg_pipe);
Denys Vlasenko7e675362016-10-28 21:57:31 +02007659#endif
7660 return rcode;
7661 }
7662 if (fg_pipe->alive_cmds == 0)
7663 return rcode;
7664 }
7665 /* There are still running processes in the fg_pipe */
7666 return -1;
7667 }
Denys Vlasenko10ad6222017-04-17 16:13:32 +02007668 /* It wasn't in fg_pipe, look for process in bg pipes */
Denys Vlasenko7e675362016-10-28 21:57:31 +02007669 }
7670
7671#if ENABLE_HUSH_JOB
7672 /* We were asked to wait for bg or orphaned children */
7673 /* No need to remember exitcode in this case */
7674 for (pi = G.job_list; pi; pi = pi->next) {
7675 for (i = 0; i < pi->num_cmds; i++) {
7676 if (pi->cmds[i].pid == childpid)
7677 goto found_pi_and_prognum;
7678 }
7679 }
7680 /* Happens when shell is used as init process (init=/bin/sh) */
7681 debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
7682 return -1; /* this wasn't a process from fg_pipe */
7683
7684 found_pi_and_prognum:
7685 if (dead) {
7686 /* child exited */
Denys Vlasenko840a4352017-07-07 22:56:02 +02007687 int rcode = WEXITSTATUS(status);
Denys Vlasenko7e675362016-10-28 21:57:31 +02007688 if (WIFSIGNALED(status))
Denys Vlasenko840a4352017-07-07 22:56:02 +02007689 rcode = 128 + WTERMSIG(status);
7690 pi->cmds[i].cmd_exitcode = rcode;
7691 if (G.last_bg_pid == pi->cmds[i].pid)
7692 G.last_bg_pid_exitcode = rcode;
7693 pi->cmds[i].pid = 0;
Denys Vlasenko7e675362016-10-28 21:57:31 +02007694 pi->alive_cmds--;
7695 if (!pi->alive_cmds) {
Denys Vlasenko2ed74e22017-07-14 19:58:46 +02007696 if (G_interactive_fd) {
Denys Vlasenko7e675362016-10-28 21:57:31 +02007697 printf(JOB_STATUS_FORMAT, pi->jobid,
7698 "Done", pi->cmdtext);
Denys Vlasenko2ed74e22017-07-14 19:58:46 +02007699 delete_finished_job(pi);
7700 } else {
7701/*
7702 * bash deletes finished jobs from job table only in interactive mode,
7703 * after "jobs" cmd, or if pid of a new process matches one of the old ones
7704 * (see cleanup_dead_jobs(), delete_old_job(), J_NOTIFIED in bash source).
7705 * Testcase script: "(exit 3) & sleep 1; wait %1; echo $?" prints 3 in bash.
7706 * We only retain one "dead" job, if it's the single job on the list.
7707 * This covers most of real-world scenarios where this is useful.
7708 */
7709 if (pi != G.job_list)
7710 delete_finished_job(pi);
7711 }
Denys Vlasenko7e675362016-10-28 21:57:31 +02007712 }
7713 } else {
7714 /* child stopped */
7715 pi->stopped_cmds++;
7716 }
7717#endif
7718 return -1; /* this wasn't a process from fg_pipe */
7719}
7720
7721/* Check to see if any processes have exited -- if they have,
7722 * figure out why and see if a job has completed.
Denys Vlasenko62b717b2016-11-07 22:12:18 +01007723 *
7724 * If non-NULL fg_pipe: wait for its completion or stop.
7725 * Return its exitcode or zero if stopped.
7726 *
7727 * Alternatively (fg_pipe == NULL, waitfor_pid != 0):
7728 * waitpid(WNOHANG), if waitfor_pid exits or stops, return exitcode+1,
7729 * else return <0 if waitpid errors out (e.g. ECHILD: nothing to wait for)
7730 * or 0 if no children changed status.
7731 *
7732 * Alternatively (fg_pipe == NULL, waitfor_pid == 0),
7733 * return <0 if waitpid errors out (e.g. ECHILD: nothing to wait for)
7734 * or 0 if no children changed status.
Denys Vlasenko7e675362016-10-28 21:57:31 +02007735 */
7736static int checkjobs(struct pipe *fg_pipe, pid_t waitfor_pid)
7737{
7738 int attributes;
7739 int status;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007740 int rcode = 0;
7741
7742 debug_printf_jobs("checkjobs %p\n", fg_pipe);
7743
7744 attributes = WUNTRACED;
7745 if (fg_pipe == NULL)
7746 attributes |= WNOHANG;
7747
7748 errno = 0;
7749#if ENABLE_HUSH_FAST
7750 if (G.handled_SIGCHLD == G.count_SIGCHLD) {
7751//bb_error_msg("[%d] checkjobs: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d children?:%d fg_pipe:%p",
7752//getpid(), G.count_SIGCHLD, G.handled_SIGCHLD, G.we_have_children, fg_pipe);
7753 /* There was neither fork nor SIGCHLD since last waitpid */
7754 /* Avoid doing waitpid syscall if possible */
7755 if (!G.we_have_children) {
7756 errno = ECHILD;
7757 return -1;
7758 }
7759 if (fg_pipe == NULL) { /* is WNOHANG set? */
7760 /* We have children, but they did not exit
7761 * or stop yet (we saw no SIGCHLD) */
7762 return 0;
7763 }
7764 /* else: !WNOHANG, waitpid will block, can't short-circuit */
7765 }
7766#endif
7767
7768/* Do we do this right?
7769 * bash-3.00# sleep 20 | false
7770 * <ctrl-Z pressed>
7771 * [3]+ Stopped sleep 20 | false
7772 * bash-3.00# echo $?
7773 * 1 <========== bg pipe is not fully done, but exitcode is already known!
7774 * [hush 1.14.0: yes we do it right]
7775 */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007776 while (1) {
Denys Vlasenko7e675362016-10-28 21:57:31 +02007777 pid_t childpid;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007778#if ENABLE_HUSH_FAST
Denys Vlasenko7e675362016-10-28 21:57:31 +02007779 int i;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007780 i = G.count_SIGCHLD;
7781#endif
7782 childpid = waitpid(-1, &status, attributes);
7783 if (childpid <= 0) {
7784 if (childpid && errno != ECHILD)
7785 bb_perror_msg("waitpid");
7786#if ENABLE_HUSH_FAST
7787 else { /* Until next SIGCHLD, waitpid's are useless */
7788 G.we_have_children = (childpid == 0);
7789 G.handled_SIGCHLD = i;
7790//bb_error_msg("[%d] checkjobs: waitpid returned <= 0, G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD);
7791 }
7792#endif
Denys Vlasenko7e675362016-10-28 21:57:31 +02007793 /* ECHILD (no children), or 0 (no change in children status) */
7794 rcode = childpid;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007795 break;
7796 }
Denys Vlasenko7e675362016-10-28 21:57:31 +02007797 rcode = process_wait_result(fg_pipe, childpid, status);
7798 if (rcode >= 0) {
7799 /* fg_pipe exited or stopped */
7800 break;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007801 }
Denys Vlasenko7e675362016-10-28 21:57:31 +02007802 if (childpid == waitfor_pid) {
Denys Vlasenko62b717b2016-11-07 22:12:18 +01007803 debug_printf_exec("childpid==waitfor_pid:%d status:0x%08x\n", childpid, status);
Denys Vlasenko7e675362016-10-28 21:57:31 +02007804 rcode = WEXITSTATUS(status);
7805 if (WIFSIGNALED(status))
7806 rcode = 128 + WTERMSIG(status);
Denys Vlasenko62b717b2016-11-07 22:12:18 +01007807 if (WIFSTOPPED(status))
7808 /* bash: "cmd & wait $!" and cmd stops: $? = 128 + stopsig */
7809 rcode = 128 + WSTOPSIG(status);
Denys Vlasenko7e675362016-10-28 21:57:31 +02007810 rcode++;
7811 break; /* "wait PID" called us, give it exitcode+1 */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007812 }
Denys Vlasenko7e675362016-10-28 21:57:31 +02007813 /* This wasn't one of our processes, or */
7814 /* fg_pipe still has running processes, do waitpid again */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007815 } /* while (waitpid succeeds)... */
7816
7817 return rcode;
7818}
7819
7820#if ENABLE_HUSH_JOB
Denys Vlasenkoda463fb2010-09-07 09:53:50 +02007821static int checkjobs_and_fg_shell(struct pipe *fg_pipe)
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007822{
7823 pid_t p;
Denys Vlasenko7e675362016-10-28 21:57:31 +02007824 int rcode = checkjobs(fg_pipe, 0 /*(no pid to wait for)*/);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007825 if (G_saved_tty_pgrp) {
7826 /* Job finished, move the shell to the foreground */
7827 p = getpgrp(); /* our process group id */
7828 debug_printf_jobs("fg'ing ourself: getpgrp()=%d\n", (int)p);
7829 tcsetpgrp(G_interactive_fd, p);
7830 }
7831 return rcode;
7832}
7833#endif
7834
7835/* Start all the jobs, but don't wait for anything to finish.
7836 * See checkjobs().
7837 *
7838 * Return code is normally -1, when the caller has to wait for children
7839 * to finish to determine the exit status of the pipe. If the pipe
7840 * is a simple builtin command, however, the action is done by the
7841 * time run_pipe returns, and the exit code is provided as the
7842 * return value.
7843 *
7844 * Returns -1 only if started some children. IOW: we have to
7845 * mask out retvals of builtins etc with 0xff!
7846 *
7847 * The only case when we do not need to [v]fork is when the pipe
7848 * is single, non-backgrounded, non-subshell command. Examples:
7849 * cmd ; ... { list } ; ...
7850 * cmd && ... { list } && ...
7851 * cmd || ... { list } || ...
Denys Vlasenkob72baeb2011-02-02 18:38:57 +01007852 * If it is, then we can run cmd as a builtin, NOFORK,
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007853 * or (if SH_STANDALONE) an applet, and we can run the { list }
7854 * with run_list. If it isn't one of these, we fork and exec cmd.
7855 *
7856 * Cases when we must fork:
7857 * non-single: cmd | cmd
7858 * backgrounded: cmd & { list } &
7859 * subshell: ( list ) [&]
7860 */
7861#if !ENABLE_HUSH_MODE_X
Denys Vlasenko26777aa2010-11-22 23:49:10 +01007862#define redirect_and_varexp_helper(new_env_p, old_vars_p, command, squirrel, argv_expanded) \
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007863 redirect_and_varexp_helper(new_env_p, old_vars_p, command, squirrel)
7864#endif
7865static int redirect_and_varexp_helper(char ***new_env_p,
7866 struct variable **old_vars_p,
7867 struct command *command,
Denys Vlasenko2db74612017-07-07 22:07:28 +02007868 struct squirrel **sqp,
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007869 char **argv_expanded)
7870{
7871 /* setup_redirects acts on file descriptors, not FILEs.
7872 * This is perfect for work that comes after exec().
7873 * Is it really safe for inline use? Experimentally,
7874 * things seem to work. */
Denys Vlasenko2db74612017-07-07 22:07:28 +02007875 int rcode = setup_redirects(command, sqp);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007876 if (rcode == 0) {
7877 char **new_env = expand_assignments(command->argv, command->assignment_cnt);
7878 *new_env_p = new_env;
7879 dump_cmd_in_x_mode(new_env);
7880 dump_cmd_in_x_mode(argv_expanded);
7881 if (old_vars_p)
7882 *old_vars_p = set_vars_and_save_old(new_env);
7883 }
7884 return rcode;
7885}
7886static NOINLINE int run_pipe(struct pipe *pi)
7887{
7888 static const char *const null_ptr = NULL;
7889
7890 int cmd_no;
7891 int next_infd;
7892 struct command *command;
7893 char **argv_expanded;
7894 char **argv;
Denys Vlasenko2db74612017-07-07 22:07:28 +02007895 struct squirrel *squirrel = NULL;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007896 int rcode;
7897
7898 debug_printf_exec("run_pipe start: members:%d\n", pi->num_cmds);
7899 debug_enter();
7900
Denys Vlasenko1fd3d942010-09-08 13:31:53 +02007901 /* Testcase: set -- q w e; (IFS='' echo "$*"; IFS=''; echo "$*"); echo "$*"
7902 * Result should be 3 lines: q w e, qwe, q w e
7903 */
7904 G.ifs = get_local_var_value("IFS");
7905 if (!G.ifs)
7906 G.ifs = defifs;
7907
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007908 IF_HUSH_JOB(pi->pgrp = -1;)
7909 pi->stopped_cmds = 0;
7910 command = &pi->cmds[0];
7911 argv_expanded = NULL;
7912
7913 if (pi->num_cmds != 1
7914 || pi->followup == PIPE_BG
7915 || command->cmd_type == CMD_SUBSHELL
7916 ) {
7917 goto must_fork;
7918 }
7919
7920 pi->alive_cmds = 1;
7921
7922 debug_printf_exec(": group:%p argv:'%s'\n",
7923 command->group, command->argv ? command->argv[0] : "NONE");
7924
7925 if (command->group) {
7926#if ENABLE_HUSH_FUNCTIONS
7927 if (command->cmd_type == CMD_FUNCDEF) {
7928 /* "executing" func () { list } */
7929 struct function *funcp;
7930
7931 funcp = new_function(command->argv[0]);
7932 /* funcp->name is already set to argv[0] */
7933 funcp->body = command->group;
7934# if !BB_MMU
7935 funcp->body_as_string = command->group_as_string;
7936 command->group_as_string = NULL;
7937# endif
7938 command->group = NULL;
7939 command->argv[0] = NULL;
7940 debug_printf_exec("cmd %p has child func at %p\n", command, funcp);
7941 funcp->parent_cmd = command;
7942 command->child_func = funcp;
7943
7944 debug_printf_exec("run_pipe: return EXIT_SUCCESS\n");
7945 debug_leave();
7946 return EXIT_SUCCESS;
7947 }
7948#endif
7949 /* { list } */
7950 debug_printf("non-subshell group\n");
7951 rcode = 1; /* exitcode if redir failed */
Denys Vlasenko2db74612017-07-07 22:07:28 +02007952 if (setup_redirects(command, &squirrel) == 0) {
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007953 debug_printf_exec(": run_list\n");
7954 rcode = run_list(command->group) & 0xff;
7955 }
7956 restore_redirects(squirrel);
7957 IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;)
7958 debug_leave();
7959 debug_printf_exec("run_pipe: return %d\n", rcode);
7960 return rcode;
7961 }
7962
7963 argv = command->argv ? command->argv : (char **) &null_ptr;
7964 {
7965 const struct built_in_command *x;
7966#if ENABLE_HUSH_FUNCTIONS
7967 const struct function *funcp;
7968#else
7969 enum { funcp = 0 };
7970#endif
7971 char **new_env = NULL;
7972 struct variable *old_vars = NULL;
7973
7974 if (argv[command->assignment_cnt] == NULL) {
7975 /* Assignments, but no command */
7976 /* Ensure redirects take effect (that is, create files).
7977 * Try "a=t >file" */
7978#if 0 /* A few cases in testsuite fail with this code. FIXME */
Denys Vlasenko2db74612017-07-07 22:07:28 +02007979 rcode = redirect_and_varexp_helper(&new_env, /*old_vars:*/ NULL, command, &squirrel, /*argv_expanded:*/ NULL);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007980 /* Set shell variables */
7981 if (new_env) {
7982 argv = new_env;
7983 while (*argv) {
Denys Vlasenko38ef39a2017-07-18 01:40:01 +02007984 if (set_local_var(*argv, /*flag:*/ 0)) {
7985 /* assignment to readonly var / putenv error? */
7986 rcode = 1;
7987 }
Denys Vlasenkob36abf22010-09-05 14:50:59 +02007988 argv++;
7989 }
7990 }
7991 /* Redirect error sets $? to 1. Otherwise,
7992 * if evaluating assignment value set $?, retain it.
7993 * Try "false; q=`exit 2`; echo $?" - should print 2: */
7994 if (rcode == 0)
7995 rcode = G.last_exitcode;
7996 /* Exit, _skipping_ variable restoring code: */
7997 goto clean_up_and_ret0;
7998
7999#else /* Older, bigger, but more correct code */
8000
Denys Vlasenko2db74612017-07-07 22:07:28 +02008001 rcode = setup_redirects(command, &squirrel);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008002 restore_redirects(squirrel);
8003 /* Set shell variables */
8004 if (G_x_mode)
8005 bb_putchar_stderr('+');
8006 while (*argv) {
Denys Vlasenkoebee4102010-09-10 10:17:53 +02008007 char *p = expand_string_to_string(*argv, /*unbackslash:*/ 1);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008008 if (G_x_mode)
8009 fprintf(stderr, " %s", p);
8010 debug_printf_exec("set shell var:'%s'->'%s'\n",
8011 *argv, p);
Denys Vlasenko38ef39a2017-07-18 01:40:01 +02008012 if (set_local_var(p, /*flag:*/ 0)) {
8013 /* assignment to readonly var / putenv error? */
8014 rcode = 1;
8015 }
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008016 argv++;
8017 }
8018 if (G_x_mode)
8019 bb_putchar_stderr('\n');
8020 /* Redirect error sets $? to 1. Otherwise,
8021 * if evaluating assignment value set $?, retain it.
8022 * Try "false; q=`exit 2`; echo $?" - should print 2: */
8023 if (rcode == 0)
8024 rcode = G.last_exitcode;
8025 IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;)
8026 debug_leave();
8027 debug_printf_exec("run_pipe: return %d\n", rcode);
8028 return rcode;
8029#endif
8030 }
8031
8032 /* Expand the rest into (possibly) many strings each */
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01008033#if BASH_TEST2
Denys Vlasenkob72baeb2011-02-02 18:38:57 +01008034 if (command->cmd_type == CMD_SINGLEWORD_NOGLOB) {
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008035 argv_expanded = expand_strvec_to_strvec_singleword_noglob(argv + command->assignment_cnt);
Denys Vlasenkob72baeb2011-02-02 18:38:57 +01008036 } else
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008037#endif
Denys Vlasenkob72baeb2011-02-02 18:38:57 +01008038 {
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008039 argv_expanded = expand_strvec_to_strvec(argv + command->assignment_cnt);
8040 }
8041
8042 /* if someone gives us an empty string: `cmd with empty output` */
8043 if (!argv_expanded[0]) {
8044 free(argv_expanded);
8045 debug_leave();
8046 return G.last_exitcode;
8047 }
8048
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008049#if ENABLE_HUSH_FUNCTIONS
Denys Vlasenko75481d32017-07-31 05:27:09 +02008050 /* Check if argv[0] matches any functions (this goes before bltins) */
8051 funcp = find_function(argv_expanded[0]);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008052#endif
Denys Vlasenko75481d32017-07-31 05:27:09 +02008053 x = NULL;
8054 if (!funcp)
8055 x = find_builtin(argv_expanded[0]);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008056 if (x || funcp) {
8057 if (!funcp) {
8058 if (x->b_function == builtin_exec && argv_expanded[1] == NULL) {
8059 debug_printf("exec with redirects only\n");
8060 rcode = setup_redirects(command, NULL);
Denys Vlasenko869994c2016-08-20 15:16:00 +02008061 /* rcode=1 can be if redir file can't be opened */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008062 goto clean_up_and_ret1;
8063 }
8064 }
Denys Vlasenko2db74612017-07-07 22:07:28 +02008065 rcode = redirect_and_varexp_helper(&new_env, &old_vars, command, &squirrel, argv_expanded);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008066 if (rcode == 0) {
8067 if (!funcp) {
8068 debug_printf_exec(": builtin '%s' '%s'...\n",
8069 x->b_cmd, argv_expanded[1]);
Denys Vlasenko8ee2ada2011-02-07 02:03:51 +01008070 fflush_all();
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008071 rcode = x->b_function(argv_expanded) & 0xff;
8072 fflush_all();
8073 }
8074#if ENABLE_HUSH_FUNCTIONS
8075 else {
8076# if ENABLE_HUSH_LOCAL
8077 struct variable **sv;
8078 sv = G.shadowed_vars_pp;
8079 G.shadowed_vars_pp = &old_vars;
8080# endif
8081 debug_printf_exec(": function '%s' '%s'...\n",
8082 funcp->name, argv_expanded[1]);
8083 rcode = run_function(funcp, argv_expanded) & 0xff;
8084# if ENABLE_HUSH_LOCAL
8085 G.shadowed_vars_pp = sv;
8086# endif
8087 }
8088#endif
8089 }
8090 clean_up_and_ret:
8091 unset_vars(new_env);
8092 add_vars(old_vars);
8093/* clean_up_and_ret0: */
8094 restore_redirects(squirrel);
Denys Vlasenko7c40ddd2017-08-02 16:37:39 +02008095 /*
8096 * Try "usleep 99999999" + ^C + "echo $?"
8097 * with FEATURE_SH_NOFORK=y.
8098 */
8099 if (!funcp) {
8100 /* It was builtin or nofork.
8101 * if this would be a real fork/execed program,
8102 * it should have died if a fatal sig was received.
8103 * But OTOH, there was no separate process,
8104 * the sig was sent to _shell_, not to non-existing
8105 * child.
8106 * Let's just handle ^C only, this one is obvious:
8107 * we aren't ok with exitcode 0 when ^C was pressed
8108 * during builtin/nofork.
8109 */
8110 if (sigismember(&G.pending_set, SIGINT))
8111 rcode = 128 + SIGINT;
8112 }
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008113 clean_up_and_ret1:
8114 free(argv_expanded);
8115 IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;)
8116 debug_leave();
8117 debug_printf_exec("run_pipe return %d\n", rcode);
8118 return rcode;
8119 }
8120
Denys Vlasenkob72baeb2011-02-02 18:38:57 +01008121 if (ENABLE_FEATURE_SH_NOFORK) {
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008122 int n = find_applet_by_name(argv_expanded[0]);
8123 if (n >= 0 && APPLET_IS_NOFORK(n)) {
Denys Vlasenko2db74612017-07-07 22:07:28 +02008124 rcode = redirect_and_varexp_helper(&new_env, &old_vars, command, &squirrel, argv_expanded);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008125 if (rcode == 0) {
8126 debug_printf_exec(": run_nofork_applet '%s' '%s'...\n",
8127 argv_expanded[0], argv_expanded[1]);
Denys Vlasenko7c40ddd2017-08-02 16:37:39 +02008128 /*
8129 * Note: signals (^C) can't interrupt here.
8130 * We remember them and they will be acted upon
8131 * after applet returns.
8132 * This makes applets which can run for a long time
8133 * and/or wait for user input ineligible for NOFORK:
8134 * for example, "yes" or "rm" (rm -i waits for input).
8135 */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008136 rcode = run_nofork_applet(n, argv_expanded);
8137 }
8138 goto clean_up_and_ret;
8139 }
8140 }
8141 /* It is neither builtin nor applet. We must fork. */
8142 }
8143
8144 must_fork:
8145 /* NB: argv_expanded may already be created, and that
8146 * might include `cmd` runs! Do not rerun it! We *must*
8147 * use argv_expanded if it's non-NULL */
8148
8149 /* Going to fork a child per each pipe member */
8150 pi->alive_cmds = 0;
8151 next_infd = 0;
8152
8153 cmd_no = 0;
8154 while (cmd_no < pi->num_cmds) {
8155 struct fd_pair pipefds;
8156#if !BB_MMU
8157 volatile nommu_save_t nommu_save;
8158 nommu_save.new_env = NULL;
8159 nommu_save.old_vars = NULL;
8160 nommu_save.argv = NULL;
8161 nommu_save.argv_from_re_execing = NULL;
8162#endif
8163 command = &pi->cmds[cmd_no];
8164 cmd_no++;
8165 if (command->argv) {
8166 debug_printf_exec(": pipe member '%s' '%s'...\n",
8167 command->argv[0], command->argv[1]);
8168 } else {
8169 debug_printf_exec(": pipe member with no argv\n");
8170 }
8171
8172 /* pipes are inserted between pairs of commands */
8173 pipefds.rd = 0;
8174 pipefds.wr = 1;
8175 if (cmd_no < pi->num_cmds)
8176 xpiped_pair(pipefds);
8177
8178 command->pid = BB_MMU ? fork() : vfork();
8179 if (!command->pid) { /* child */
8180#if ENABLE_HUSH_JOB
8181 disable_restore_tty_pgrp_on_exit();
8182 CLEAR_RANDOM_T(&G.random_gen); /* or else $RANDOM repeats in child */
8183
8184 /* Every child adds itself to new process group
8185 * with pgid == pid_of_first_child_in_pipe */
8186 if (G.run_list_level == 1 && G_interactive_fd) {
8187 pid_t pgrp;
8188 pgrp = pi->pgrp;
8189 if (pgrp < 0) /* true for 1st process only */
8190 pgrp = getpid();
8191 if (setpgid(0, pgrp) == 0
8192 && pi->followup != PIPE_BG
8193 && G_saved_tty_pgrp /* we have ctty */
8194 ) {
8195 /* We do it in *every* child, not just first,
8196 * to avoid races */
8197 tcsetpgrp(G_interactive_fd, pgrp);
8198 }
8199 }
8200#endif
8201 if (pi->alive_cmds == 0 && pi->followup == PIPE_BG) {
8202 /* 1st cmd in backgrounded pipe
8203 * should have its stdin /dev/null'ed */
8204 close(0);
8205 if (open(bb_dev_null, O_RDONLY))
8206 xopen("/", O_RDONLY);
8207 } else {
8208 xmove_fd(next_infd, 0);
8209 }
8210 xmove_fd(pipefds.wr, 1);
8211 if (pipefds.rd > 1)
8212 close(pipefds.rd);
8213 /* Like bash, explicit redirects override pipes,
Denys Vlasenko869994c2016-08-20 15:16:00 +02008214 * and the pipe fd (fd#1) is available for dup'ing:
8215 * "cmd1 2>&1 | cmd2": fd#1 is duped to fd#2, thus stderr
8216 * of cmd1 goes into pipe.
8217 */
8218 if (setup_redirects(command, NULL)) {
8219 /* Happens when redir file can't be opened:
8220 * $ hush -c 'echo FOO >&2 | echo BAR 3>/qwe/rty; echo BAZ'
8221 * FOO
8222 * hush: can't open '/qwe/rty': No such file or directory
8223 * BAZ
8224 * (echo BAR is not executed, it hits _exit(1) below)
8225 */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008226 _exit(1);
Denys Vlasenko869994c2016-08-20 15:16:00 +02008227 }
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008228
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008229 /* Stores to nommu_save list of env vars putenv'ed
8230 * (NOMMU, on MMU we don't need that) */
8231 /* cast away volatility... */
8232 pseudo_exec((nommu_save_t*) &nommu_save, command, argv_expanded);
8233 /* pseudo_exec() does not return */
8234 }
8235
8236 /* parent or error */
8237#if ENABLE_HUSH_FAST
8238 G.count_SIGCHLD++;
8239//bb_error_msg("[%d] fork in run_pipe: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD);
8240#endif
8241 enable_restore_tty_pgrp_on_exit();
8242#if !BB_MMU
8243 /* Clean up after vforked child */
8244 free(nommu_save.argv);
8245 free(nommu_save.argv_from_re_execing);
8246 unset_vars(nommu_save.new_env);
8247 add_vars(nommu_save.old_vars);
8248#endif
8249 free(argv_expanded);
8250 argv_expanded = NULL;
8251 if (command->pid < 0) { /* [v]fork failed */
8252 /* Clearly indicate, was it fork or vfork */
8253 bb_perror_msg(BB_MMU ? "vfork"+1 : "vfork");
8254 } else {
8255 pi->alive_cmds++;
8256#if ENABLE_HUSH_JOB
8257 /* Second and next children need to know pid of first one */
8258 if (pi->pgrp < 0)
8259 pi->pgrp = command->pid;
8260#endif
8261 }
8262
8263 if (cmd_no > 1)
8264 close(next_infd);
8265 if (cmd_no < pi->num_cmds)
8266 close(pipefds.wr);
8267 /* Pass read (output) pipe end to next iteration */
8268 next_infd = pipefds.rd;
8269 }
8270
8271 if (!pi->alive_cmds) {
8272 debug_leave();
8273 debug_printf_exec("run_pipe return 1 (all forks failed, no children)\n");
8274 return 1;
8275 }
8276
8277 debug_leave();
8278 debug_printf_exec("run_pipe return -1 (%u children started)\n", pi->alive_cmds);
8279 return -1;
8280}
8281
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008282/* NB: called by pseudo_exec, and therefore must not modify any
8283 * global data until exec/_exit (we can be a child after vfork!) */
8284static int run_list(struct pipe *pi)
8285{
8286#if ENABLE_HUSH_CASE
8287 char *case_word = NULL;
8288#endif
8289#if ENABLE_HUSH_LOOPS
8290 struct pipe *loop_top = NULL;
8291 char **for_lcur = NULL;
8292 char **for_list = NULL;
8293#endif
8294 smallint last_followup;
8295 smalluint rcode;
8296#if ENABLE_HUSH_IF || ENABLE_HUSH_CASE
8297 smalluint cond_code = 0;
8298#else
8299 enum { cond_code = 0 };
8300#endif
8301#if HAS_KEYWORDS
Denys Vlasenko9b782552010-09-08 13:33:26 +02008302 smallint rword; /* RES_foo */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008303 smallint last_rword; /* ditto */
8304#endif
8305
8306 debug_printf_exec("run_list start lvl %d\n", G.run_list_level);
8307 debug_enter();
8308
8309#if ENABLE_HUSH_LOOPS
8310 /* Check syntax for "for" */
Denys Vlasenko0d6a4ec2010-12-18 01:34:49 +01008311 {
8312 struct pipe *cpipe;
8313 for (cpipe = pi; cpipe; cpipe = cpipe->next) {
8314 if (cpipe->res_word != RES_FOR && cpipe->res_word != RES_IN)
8315 continue;
8316 /* current word is FOR or IN (BOLD in comments below) */
8317 if (cpipe->next == NULL) {
8318 syntax_error("malformed for");
8319 debug_leave();
8320 debug_printf_exec("run_list lvl %d return 1\n", G.run_list_level);
8321 return 1;
8322 }
8323 /* "FOR v; do ..." and "for v IN a b; do..." are ok */
8324 if (cpipe->next->res_word == RES_DO)
8325 continue;
8326 /* next word is not "do". It must be "in" then ("FOR v in ...") */
8327 if (cpipe->res_word == RES_IN /* "for v IN a b; not_do..."? */
8328 || cpipe->next->res_word != RES_IN /* FOR v not_do_and_not_in..."? */
8329 ) {
8330 syntax_error("malformed for");
8331 debug_leave();
8332 debug_printf_exec("run_list lvl %d return 1\n", G.run_list_level);
8333 return 1;
8334 }
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008335 }
8336 }
8337#endif
8338
8339 /* Past this point, all code paths should jump to ret: label
8340 * in order to return, no direct "return" statements please.
8341 * This helps to ensure that no memory is leaked. */
8342
8343#if ENABLE_HUSH_JOB
8344 G.run_list_level++;
8345#endif
8346
8347#if HAS_KEYWORDS
8348 rword = RES_NONE;
8349 last_rword = RES_XXXX;
8350#endif
8351 last_followup = PIPE_SEQ;
8352 rcode = G.last_exitcode;
8353
8354 /* Go through list of pipes, (maybe) executing them. */
8355 for (; pi; pi = IF_HUSH_LOOPS(rword == RES_DONE ? loop_top : ) pi->next) {
Denys Vlasenko5cc9bf62016-11-08 17:34:44 +01008356 int r;
Denys Vlasenko9fda6092017-07-14 13:36:48 +02008357 int sv_errexit_depth;
Denys Vlasenko5cc9bf62016-11-08 17:34:44 +01008358
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008359 if (G.flag_SIGINT)
8360 break;
Denys Vlasenko04b46bc2016-10-01 22:28:03 +02008361 if (G_flag_return_in_progress == 1)
8362 break;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008363
8364 IF_HAS_KEYWORDS(rword = pi->res_word;)
8365 debug_printf_exec(": rword=%d cond_code=%d last_rword=%d\n",
8366 rword, cond_code, last_rword);
Denys Vlasenko9fda6092017-07-14 13:36:48 +02008367
8368 sv_errexit_depth = G.errexit_depth;
8369 if (IF_HAS_KEYWORDS(rword == RES_IF || rword == RES_ELIF ||)
8370 pi->followup != PIPE_SEQ
8371 ) {
8372 G.errexit_depth++;
8373 }
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008374#if ENABLE_HUSH_LOOPS
8375 if ((rword == RES_WHILE || rword == RES_UNTIL || rword == RES_FOR)
8376 && loop_top == NULL /* avoid bumping G.depth_of_loop twice */
8377 ) {
8378 /* start of a loop: remember where loop starts */
8379 loop_top = pi;
8380 G.depth_of_loop++;
8381 }
8382#endif
8383 /* Still in the same "if...", "then..." or "do..." branch? */
8384 if (IF_HAS_KEYWORDS(rword == last_rword &&) 1) {
8385 if ((rcode == 0 && last_followup == PIPE_OR)
8386 || (rcode != 0 && last_followup == PIPE_AND)
8387 ) {
8388 /* It is "<true> || CMD" or "<false> && CMD"
8389 * and we should not execute CMD */
8390 debug_printf_exec("skipped cmd because of || or &&\n");
8391 last_followup = pi->followup;
Denys Vlasenko3beab832013-04-07 18:16:58 +02008392 goto dont_check_jobs_but_continue;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008393 }
8394 }
8395 last_followup = pi->followup;
8396 IF_HAS_KEYWORDS(last_rword = rword;)
8397#if ENABLE_HUSH_IF
8398 if (cond_code) {
8399 if (rword == RES_THEN) {
8400 /* if false; then ... fi has exitcode 0! */
8401 G.last_exitcode = rcode = EXIT_SUCCESS;
8402 /* "if <false> THEN cmd": skip cmd */
8403 continue;
8404 }
8405 } else {
8406 if (rword == RES_ELSE || rword == RES_ELIF) {
8407 /* "if <true> then ... ELSE/ELIF cmd":
8408 * skip cmd and all following ones */
8409 break;
8410 }
8411 }
8412#endif
8413#if ENABLE_HUSH_LOOPS
8414 if (rword == RES_FOR) { /* && pi->num_cmds - always == 1 */
8415 if (!for_lcur) {
8416 /* first loop through for */
8417
8418 static const char encoded_dollar_at[] ALIGN1 = {
8419 SPECIAL_VAR_SYMBOL, '@' | 0x80, SPECIAL_VAR_SYMBOL, '\0'
8420 }; /* encoded representation of "$@" */
8421 static const char *const encoded_dollar_at_argv[] = {
8422 encoded_dollar_at, NULL
8423 }; /* argv list with one element: "$@" */
8424 char **vals;
8425
8426 vals = (char**)encoded_dollar_at_argv;
8427 if (pi->next->res_word == RES_IN) {
8428 /* if no variable values after "in" we skip "for" */
8429 if (!pi->next->cmds[0].argv) {
8430 G.last_exitcode = rcode = EXIT_SUCCESS;
8431 debug_printf_exec(": null FOR: exitcode EXIT_SUCCESS\n");
8432 break;
8433 }
8434 vals = pi->next->cmds[0].argv;
8435 } /* else: "for var; do..." -> assume "$@" list */
8436 /* create list of variable values */
8437 debug_print_strings("for_list made from", vals);
8438 for_list = expand_strvec_to_strvec(vals);
8439 for_lcur = for_list;
8440 debug_print_strings("for_list", for_list);
8441 }
8442 if (!*for_lcur) {
8443 /* "for" loop is over, clean up */
8444 free(for_list);
8445 for_list = NULL;
8446 for_lcur = NULL;
8447 break;
8448 }
8449 /* Insert next value from for_lcur */
8450 /* note: *for_lcur already has quotes removed, $var expanded, etc */
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02008451 set_local_var(xasprintf("%s=%s", pi->cmds[0].argv[0], *for_lcur++), /*flag:*/ 0);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008452 continue;
8453 }
8454 if (rword == RES_IN) {
8455 continue; /* "for v IN list;..." - "in" has no cmds anyway */
8456 }
8457 if (rword == RES_DONE) {
8458 continue; /* "done" has no cmds too */
8459 }
8460#endif
8461#if ENABLE_HUSH_CASE
8462 if (rword == RES_CASE) {
Denys Vlasenkoaeaee432016-11-04 20:14:04 +01008463 debug_printf_exec("CASE cond_code:%d\n", cond_code);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008464 case_word = expand_strvec_to_string(pi->cmds->argv);
Denys Vlasenkobd43c672017-07-05 23:12:15 +02008465 unbackslash(case_word);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008466 continue;
8467 }
8468 if (rword == RES_MATCH) {
8469 char **argv;
8470
Denys Vlasenkoaeaee432016-11-04 20:14:04 +01008471 debug_printf_exec("MATCH cond_code:%d\n", cond_code);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008472 if (!case_word) /* "case ... matched_word) ... WORD)": we executed selected branch, stop */
8473 break;
8474 /* all prev words didn't match, does this one match? */
8475 argv = pi->cmds->argv;
8476 while (*argv) {
Denys Vlasenkobd43c672017-07-05 23:12:15 +02008477 char *pattern = expand_string_to_string(*argv, /*unbackslash:*/ 0);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008478 /* TODO: which FNM_xxx flags to use? */
8479 cond_code = (fnmatch(pattern, case_word, /*flags:*/ 0) != 0);
Denys Vlasenkobd43c672017-07-05 23:12:15 +02008480 debug_printf_exec("fnmatch(pattern:'%s',str:'%s'):%d\n", pattern, case_word, cond_code);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008481 free(pattern);
8482 if (cond_code == 0) { /* match! we will execute this branch */
Denys Vlasenkoaeaee432016-11-04 20:14:04 +01008483 free(case_word);
8484 case_word = NULL; /* make future "word)" stop */
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008485 break;
8486 }
8487 argv++;
8488 }
8489 continue;
8490 }
8491 if (rword == RES_CASE_BODY) { /* inside of a case branch */
Denys Vlasenkoaeaee432016-11-04 20:14:04 +01008492 debug_printf_exec("CASE_BODY cond_code:%d\n", cond_code);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008493 if (cond_code != 0)
8494 continue; /* not matched yet, skip this pipe */
8495 }
Denys Vlasenkoaeaee432016-11-04 20:14:04 +01008496 if (rword == RES_ESAC) {
8497 debug_printf_exec("ESAC cond_code:%d\n", cond_code);
8498 if (case_word) {
8499 /* "case" did not match anything: still set $? (to 0) */
8500 G.last_exitcode = rcode = EXIT_SUCCESS;
8501 }
8502 }
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008503#endif
8504 /* Just pressing <enter> in shell should check for jobs.
8505 * OTOH, in non-interactive shell this is useless
8506 * and only leads to extra job checks */
8507 if (pi->num_cmds == 0) {
8508 if (G_interactive_fd)
8509 goto check_jobs_and_continue;
8510 continue;
8511 }
8512
8513 /* After analyzing all keywords and conditions, we decided
8514 * to execute this pipe. NB: have to do checkjobs(NULL)
8515 * after run_pipe to collect any background children,
8516 * even if list execution is to be stopped. */
8517 debug_printf_exec(": run_pipe with %d members\n", pi->num_cmds);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008518#if ENABLE_HUSH_LOOPS
Denys Vlasenko5cc9bf62016-11-08 17:34:44 +01008519 G.flag_break_continue = 0;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008520#endif
Denys Vlasenko5cc9bf62016-11-08 17:34:44 +01008521 rcode = r = run_pipe(pi); /* NB: rcode is a smalluint, r is int */
8522 if (r != -1) {
8523 /* We ran a builtin, function, or group.
8524 * rcode is already known
8525 * and we don't need to wait for anything. */
8526 debug_printf_exec(": builtin/func exitcode %d\n", rcode);
8527 G.last_exitcode = rcode;
8528 check_and_run_traps();
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008529#if ENABLE_HUSH_LOOPS
Denys Vlasenko5cc9bf62016-11-08 17:34:44 +01008530 /* Was it "break" or "continue"? */
8531 if (G.flag_break_continue) {
8532 smallint fbc = G.flag_break_continue;
8533 /* We might fall into outer *loop*,
8534 * don't want to break it too */
8535 if (loop_top) {
8536 G.depth_break_continue--;
8537 if (G.depth_break_continue == 0)
8538 G.flag_break_continue = 0;
8539 /* else: e.g. "continue 2" should *break* once, *then* continue */
8540 } /* else: "while... do... { we are here (innermost list is not a loop!) };...done" */
8541 if (G.depth_break_continue != 0 || fbc == BC_BREAK) {
Denys Vlasenko7e675362016-10-28 21:57:31 +02008542 checkjobs(NULL, 0 /*(no pid to wait for)*/);
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008543 break;
8544 }
Denys Vlasenko5cc9bf62016-11-08 17:34:44 +01008545 /* "continue": simulate end of loop */
8546 rword = RES_DONE;
8547 continue;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008548 }
Denys Vlasenko5cc9bf62016-11-08 17:34:44 +01008549#endif
8550 if (G_flag_return_in_progress == 1) {
8551 checkjobs(NULL, 0 /*(no pid to wait for)*/);
8552 break;
8553 }
8554 } else if (pi->followup == PIPE_BG) {
8555 /* What does bash do with attempts to background builtins? */
8556 /* even bash 3.2 doesn't do that well with nested bg:
8557 * try "{ { sleep 10; echo DEEP; } & echo HERE; } &".
8558 * I'm NOT treating inner &'s as jobs */
8559#if ENABLE_HUSH_JOB
8560 if (G.run_list_level == 1)
Denys Vlasenko16096292017-07-10 10:00:28 +02008561 insert_job_into_table(pi);
Denys Vlasenko5cc9bf62016-11-08 17:34:44 +01008562#endif
8563 /* Last command's pid goes to $! */
8564 G.last_bg_pid = pi->cmds[pi->num_cmds - 1].pid;
Denys Vlasenko840a4352017-07-07 22:56:02 +02008565 G.last_bg_pid_exitcode = 0;
Denys Vlasenko5cc9bf62016-11-08 17:34:44 +01008566 debug_printf_exec(": cmd&: exitcode EXIT_SUCCESS\n");
Denys Vlasenko7c40ddd2017-08-02 16:37:39 +02008567/* Check pi->pi_inverted? "! sleep 1 & echo $?": bash says 1. dash and ash say 0 */
Denys Vlasenko6c635d62016-11-08 20:26:11 +01008568 rcode = EXIT_SUCCESS;
8569 goto check_traps;
Denys Vlasenko5cc9bf62016-11-08 17:34:44 +01008570 } else {
8571#if ENABLE_HUSH_JOB
8572 if (G.run_list_level == 1 && G_interactive_fd) {
8573 /* Waits for completion, then fg's main shell */
8574 rcode = checkjobs_and_fg_shell(pi);
8575 debug_printf_exec(": checkjobs_and_fg_shell exitcode %d\n", rcode);
Denys Vlasenko6c635d62016-11-08 20:26:11 +01008576 goto check_traps;
Denys Vlasenko5cc9bf62016-11-08 17:34:44 +01008577 }
Denys Vlasenko6c635d62016-11-08 20:26:11 +01008578#endif
8579 /* This one just waits for completion */
8580 rcode = checkjobs(pi, 0 /*(no pid to wait for)*/);
8581 debug_printf_exec(": checkjobs exitcode %d\n", rcode);
8582 check_traps:
Denys Vlasenko5cc9bf62016-11-08 17:34:44 +01008583 G.last_exitcode = rcode;
8584 check_and_run_traps();
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008585 }
8586
Denys Vlasenko9fda6092017-07-14 13:36:48 +02008587 /* Handle "set -e" */
8588 if (rcode != 0 && G.o_opt[OPT_O_ERREXIT]) {
8589 debug_printf_exec("ERREXIT:1 errexit_depth:%d\n", G.errexit_depth);
8590 if (G.errexit_depth == 0)
8591 hush_exit(rcode);
8592 }
8593 G.errexit_depth = sv_errexit_depth;
8594
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008595 /* Analyze how result affects subsequent commands */
8596#if ENABLE_HUSH_IF
8597 if (rword == RES_IF || rword == RES_ELIF)
8598 cond_code = rcode;
8599#endif
Denys Vlasenko3beab832013-04-07 18:16:58 +02008600 check_jobs_and_continue:
Denys Vlasenko7e675362016-10-28 21:57:31 +02008601 checkjobs(NULL, 0 /*(no pid to wait for)*/);
Denys Vlasenko3beab832013-04-07 18:16:58 +02008602 dont_check_jobs_but_continue: ;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008603#if ENABLE_HUSH_LOOPS
8604 /* Beware of "while false; true; do ..."! */
Denys Vlasenko00ae9892011-05-31 17:35:45 +02008605 if (pi->next
8606 && (pi->next->res_word == RES_DO || pi->next->res_word == RES_DONE)
Denys Vlasenko56a3b822011-06-01 12:47:07 +02008607 /* check for RES_DONE is needed for "while ...; do \n done" case */
Denys Vlasenko00ae9892011-05-31 17:35:45 +02008608 ) {
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008609 if (rword == RES_WHILE) {
8610 if (rcode) {
8611 /* "while false; do...done" - exitcode 0 */
8612 G.last_exitcode = rcode = EXIT_SUCCESS;
8613 debug_printf_exec(": while expr is false: breaking (exitcode:EXIT_SUCCESS)\n");
Denys Vlasenko3beab832013-04-07 18:16:58 +02008614 break;
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008615 }
8616 }
8617 if (rword == RES_UNTIL) {
8618 if (!rcode) {
8619 debug_printf_exec(": until expr is true: breaking\n");
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008620 break;
8621 }
8622 }
8623 }
8624#endif
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008625 } /* for (pi) */
8626
8627#if ENABLE_HUSH_JOB
8628 G.run_list_level--;
8629#endif
8630#if ENABLE_HUSH_LOOPS
8631 if (loop_top)
8632 G.depth_of_loop--;
8633 free(for_list);
8634#endif
8635#if ENABLE_HUSH_CASE
8636 free(case_word);
8637#endif
8638 debug_leave();
8639 debug_printf_exec("run_list lvl %d return %d\n", G.run_list_level + 1, rcode);
8640 return rcode;
8641}
8642
8643/* Select which version we will use */
8644static int run_and_free_list(struct pipe *pi)
8645{
8646 int rcode = 0;
8647 debug_printf_exec("run_and_free_list entered\n");
Dan Fandrich85c62472010-11-20 13:05:17 -08008648 if (!G.o_opt[OPT_O_NOEXEC]) {
Denys Vlasenkob36abf22010-09-05 14:50:59 +02008649 debug_printf_exec(": run_list: 1st pipe with %d cmds\n", pi->num_cmds);
8650 rcode = run_list(pi);
8651 }
8652 /* free_pipe_list has the side effect of clearing memory.
8653 * In the long run that function can be merged with run_list,
8654 * but doing that now would hobble the debugging effort. */
8655 free_pipe_list(pi);
8656 debug_printf_exec("run_and_free_list return %d\n", rcode);
8657 return rcode;
8658}
8659
8660
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02008661static void install_sighandlers(unsigned mask)
Eric Andersen52a97ca2001-06-22 06:49:26 +00008662{
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02008663 sighandler_t old_handler;
8664 unsigned sig = 0;
8665 while ((mask >>= 1) != 0) {
8666 sig++;
8667 if (!(mask & 1))
8668 continue;
Denys Vlasenko0806e402011-05-12 23:06:20 +02008669 old_handler = install_sighandler(sig, pick_sighandler(sig));
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02008670 /* POSIX allows shell to re-enable SIGCHLD
8671 * even if it was SIG_IGN on entry.
8672 * Therefore we skip IGN check for it:
8673 */
8674 if (sig == SIGCHLD)
8675 continue;
Denys Vlasenko49e6bf22017-08-04 14:28:16 +02008676 /* bash re-enables SIGHUP which is SIG_IGNed on entry.
8677 * Try: "trap '' HUP; bash; echo RET" and type "kill -HUP $$"
8678 */
8679 //if (sig == SIGHUP) continue; - TODO?
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02008680 if (old_handler == SIG_IGN) {
8681 /* oops... restore back to IGN, and record this fact */
Denys Vlasenko0806e402011-05-12 23:06:20 +02008682 install_sighandler(sig, old_handler);
Denys Vlasenko7a85c602017-01-08 17:40:18 +01008683#if ENABLE_HUSH_TRAP
8684 if (!G_traps)
8685 G_traps = xzalloc(sizeof(G_traps[0]) * NSIG);
8686 free(G_traps[sig]);
8687 G_traps[sig] = xzalloc(1); /* == xstrdup(""); */
8688#endif
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02008689 }
8690 }
8691}
8692
8693/* Called a few times only (or even once if "sh -c") */
8694static void install_special_sighandlers(void)
8695{
Denis Vlasenkof9375282009-04-05 19:13:39 +00008696 unsigned mask;
Denys Vlasenkoe89a2412010-01-12 15:19:31 +01008697
Denys Vlasenko54e9e122011-05-09 00:52:15 +02008698 /* Which signals are shell-special? */
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02008699 mask = (1 << SIGQUIT) | (1 << SIGCHLD);
Denys Vlasenko54e9e122011-05-09 00:52:15 +02008700 if (G_interactive_fd) {
8701 mask |= SPECIAL_INTERACTIVE_SIGS;
8702 if (G_saved_tty_pgrp) /* we have ctty, job control sigs work */
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02008703 mask |= SPECIAL_JOBSTOP_SIGS;
Denys Vlasenko54e9e122011-05-09 00:52:15 +02008704 }
Denys Vlasenkof58f7052011-05-12 02:10:33 +02008705 /* Careful, do not re-install handlers we already installed */
8706 if (G.special_sig_mask != mask) {
8707 unsigned diff = mask & ~G.special_sig_mask;
8708 G.special_sig_mask = mask;
8709 install_sighandlers(diff);
8710 }
Denis Vlasenkof9375282009-04-05 19:13:39 +00008711}
8712
8713#if ENABLE_HUSH_JOB
8714/* helper */
Denys Vlasenko54e9e122011-05-09 00:52:15 +02008715/* Set handlers to restore tty pgrp and exit */
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02008716static void install_fatal_sighandlers(void)
Denis Vlasenkof9375282009-04-05 19:13:39 +00008717{
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02008718 unsigned mask;
Denys Vlasenko54e9e122011-05-09 00:52:15 +02008719
8720 /* We will restore tty pgrp on these signals */
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02008721 mask = 0
Denys Vlasenko830ea352016-11-08 04:59:11 +01008722 /*+ (1 << SIGILL ) * HUSH_DEBUG*/
8723 /*+ (1 << SIGFPE ) * HUSH_DEBUG*/
Denys Vlasenko54e9e122011-05-09 00:52:15 +02008724 + (1 << SIGBUS ) * HUSH_DEBUG
8725 + (1 << SIGSEGV) * HUSH_DEBUG
Denys Vlasenko830ea352016-11-08 04:59:11 +01008726 /*+ (1 << SIGTRAP) * HUSH_DEBUG*/
Denys Vlasenko54e9e122011-05-09 00:52:15 +02008727 + (1 << SIGABRT)
8728 /* bash 3.2 seems to handle these just like 'fatal' ones */
8729 + (1 << SIGPIPE)
8730 + (1 << SIGALRM)
Denys Vlasenkof58f7052011-05-12 02:10:33 +02008731 /* if we are interactive, SIGHUP, SIGTERM and SIGINT are special sigs.
Denys Vlasenko54e9e122011-05-09 00:52:15 +02008732 * if we aren't interactive... but in this case
Denys Vlasenkof58f7052011-05-12 02:10:33 +02008733 * we never want to restore pgrp on exit, and this fn is not called
8734 */
Denys Vlasenko54e9e122011-05-09 00:52:15 +02008735 /*+ (1 << SIGHUP )*/
8736 /*+ (1 << SIGTERM)*/
8737 /*+ (1 << SIGINT )*/
8738 ;
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02008739 G_fatal_sig_mask = mask;
Denys Vlasenko54e9e122011-05-09 00:52:15 +02008740
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02008741 install_sighandlers(mask);
Denis Vlasenkof9375282009-04-05 19:13:39 +00008742}
Denis Vlasenkob81b3df2007-04-28 16:48:04 +00008743#endif
Eric Andersenada18ff2001-05-21 16:18:22 +00008744
Denys Vlasenko6696eac2010-11-14 02:01:50 +01008745static int set_mode(int state, char mode, const char *o_opt)
Denis Vlasenkod5762932009-03-31 11:22:57 +00008746{
Denys Vlasenko6696eac2010-11-14 02:01:50 +01008747 int idx;
Denis Vlasenkod5762932009-03-31 11:22:57 +00008748 switch (mode) {
Denys Vlasenko6696eac2010-11-14 02:01:50 +01008749 case 'n':
Dan Fandrich85c62472010-11-20 13:05:17 -08008750 G.o_opt[OPT_O_NOEXEC] = state;
Denys Vlasenko6696eac2010-11-14 02:01:50 +01008751 break;
8752 case 'x':
8753 IF_HUSH_MODE_X(G_x_mode = state;)
8754 break;
8755 case 'o':
8756 if (!o_opt) {
8757 /* "set -+o" without parameter.
8758 * in bash, set -o produces this output:
8759 * pipefail off
8760 * and set +o:
8761 * set +o pipefail
8762 * We always use the second form.
8763 */
8764 const char *p = o_opt_strings;
8765 idx = 0;
8766 while (*p) {
8767 printf("set %co %s\n", (G.o_opt[idx] ? '-' : '+'), p);
8768 idx++;
8769 p += strlen(p) + 1;
8770 }
8771 break;
8772 }
8773 idx = index_in_strings(o_opt_strings, o_opt);
8774 if (idx >= 0) {
8775 G.o_opt[idx] = state;
8776 break;
8777 }
Denys Vlasenko9fda6092017-07-14 13:36:48 +02008778 case 'e':
8779 G.o_opt[OPT_O_ERREXIT] = state;
8780 break;
Denys Vlasenko6696eac2010-11-14 02:01:50 +01008781 default:
8782 return EXIT_FAILURE;
Denis Vlasenkod5762932009-03-31 11:22:57 +00008783 }
8784 return EXIT_SUCCESS;
8785}
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00008786
Denis Vlasenko9b49a5e2007-10-11 10:05:36 +00008787int hush_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
Matt Kraai2d91deb2001-08-01 17:21:35 +00008788int hush_main(int argc, char **argv)
Eric Andersen25f27032001-04-26 23:22:31 +00008789{
Denys Vlasenkof58f7052011-05-12 02:10:33 +02008790 enum {
8791 OPT_login = (1 << 0),
8792 };
8793 unsigned flags;
Eric Andersen25f27032001-04-26 23:22:31 +00008794 int opt;
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02008795 unsigned builtin_argc;
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00008796 char **e;
Denis Vlasenkod76c0492007-05-25 02:16:25 +00008797 struct variable *cur_var;
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01008798 struct variable *shell_ver;
Eric Andersenbc604a22001-05-16 05:24:03 +00008799
Denis Vlasenko574f2f42008-02-27 18:41:59 +00008800 INIT_G();
Denys Vlasenko10c01312011-05-11 11:49:21 +02008801 if (EXIT_SUCCESS != 0) /* if EXIT_SUCCESS == 0, it is already done */
Denis Vlasenkoab2b0642009-04-06 18:42:11 +00008802 G.last_exitcode = EXIT_SUCCESS;
Denys Vlasenkoe9abe752016-08-19 20:15:26 +02008803
Denys Vlasenko10c01312011-05-11 11:49:21 +02008804#if ENABLE_HUSH_FAST
8805 G.count_SIGCHLD++; /* ensure it is != G.handled_SIGCHLD */
8806#endif
Denis Vlasenko46f9b6d2009-04-05 10:39:03 +00008807#if !BB_MMU
8808 G.argv0_for_re_execing = argv[0];
8809#endif
Denis Vlasenko0a83fc32007-05-25 11:12:32 +00008810 /* Deal with HUSH_VERSION */
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01008811 shell_ver = xzalloc(sizeof(*shell_ver));
8812 shell_ver->flg_export = 1;
8813 shell_ver->flg_read_only = 1;
Denys Vlasenko4f870492010-09-10 11:06:01 +02008814 /* Code which handles ${var<op>...} needs writable values for all variables,
Denys Vlasenko36f774a2010-09-05 14:45:38 +02008815 * therefore we xstrdup: */
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01008816 shell_ver->varstr = xstrdup(hush_version_str);
Denys Vlasenko605067b2010-09-06 12:10:51 +02008817 /* Create shell local variables from the values
8818 * currently living in the environment */
Denis Vlasenkof886fd22008-10-13 12:36:05 +00008819 debug_printf_env("unsetenv '%s'\n", "HUSH_VERSION");
Denis Vlasenko0a83fc32007-05-25 11:12:32 +00008820 unsetenv("HUSH_VERSION"); /* in case it exists in initial env */
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01008821 G.top_var = shell_ver;
Denis Vlasenko87a86552008-07-29 19:43:10 +00008822 cur_var = G.top_var;
Denis Vlasenko0a83fc32007-05-25 11:12:32 +00008823 e = environ;
Denis Vlasenkod76c0492007-05-25 02:16:25 +00008824 if (e) while (*e) {
8825 char *value = strchr(*e, '=');
8826 if (value) { /* paranoia */
8827 cur_var->next = xzalloc(sizeof(*cur_var));
8828 cur_var = cur_var->next;
Denis Vlasenko28c0f0f2007-05-25 02:46:01 +00008829 cur_var->varstr = *e;
Denis Vlasenkod76c0492007-05-25 02:16:25 +00008830 cur_var->max_len = strlen(*e);
8831 cur_var->flg_export = 1;
8832 }
8833 e++;
8834 }
Denys Vlasenko605067b2010-09-06 12:10:51 +02008835 /* (Re)insert HUSH_VERSION into env (AFTER we scanned the env!) */
Denys Vlasenko75eb9d22010-12-21 21:18:12 +01008836 debug_printf_env("putenv '%s'\n", shell_ver->varstr);
8837 putenv(shell_ver->varstr);
Denys Vlasenko6db47842009-09-05 20:15:17 +02008838
8839 /* Export PWD */
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02008840 set_pwd_var(SETFLAG_EXPORT);
Denys Vlasenko3fa97af2014-04-15 11:43:29 +02008841
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01008842#if BASH_HOSTNAME_VAR
Denys Vlasenko3fa97af2014-04-15 11:43:29 +02008843 /* Set (but not export) HOSTNAME unless already set */
8844 if (!get_local_var_value("HOSTNAME")) {
8845 struct utsname uts;
8846 uname(&uts);
8847 set_local_var_from_halves("HOSTNAME", uts.nodename);
8848 }
Denys Vlasenko6db47842009-09-05 20:15:17 +02008849 /* bash also exports SHLVL and _,
8850 * and sets (but doesn't export) the following variables:
8851 * BASH=/bin/bash
8852 * BASH_VERSINFO=([0]="3" [1]="2" [2]="0" [3]="1" [4]="release" [5]="i386-pc-linux-gnu")
8853 * BASH_VERSION='3.2.0(1)-release'
8854 * HOSTTYPE=i386
8855 * MACHTYPE=i386-pc-linux-gnu
8856 * OSTYPE=linux-gnu
Denys Vlasenkodea47882009-10-09 15:40:49 +02008857 * PPID=<NNNNN> - we also do it elsewhere
Denys Vlasenko6db47842009-09-05 20:15:17 +02008858 * EUID=<NNNNN>
8859 * UID=<NNNNN>
8860 * GROUPS=()
8861 * LINES=<NNN>
8862 * COLUMNS=<NNN>
8863 * BASH_ARGC=()
8864 * BASH_ARGV=()
8865 * BASH_LINENO=()
8866 * BASH_SOURCE=()
8867 * DIRSTACK=()
8868 * PIPESTATUS=([0]="0")
8869 * HISTFILE=/<xxx>/.bash_history
8870 * HISTFILESIZE=500
8871 * HISTSIZE=500
8872 * MAILCHECK=60
8873 * PATH=/usr/gnu/bin:/usr/local/bin:/bin:/usr/bin:.
8874 * SHELL=/bin/bash
8875 * SHELLOPTS=braceexpand:emacs:hashall:histexpand:history:interactive-comments:monitor
8876 * TERM=dumb
8877 * OPTERR=1
8878 * OPTIND=1
8879 * IFS=$' \t\n'
8880 * PS1='\s-\v\$ '
8881 * PS2='> '
8882 * PS4='+ '
8883 */
Denys Vlasenko3fa97af2014-04-15 11:43:29 +02008884#endif
Denys Vlasenko6db47842009-09-05 20:15:17 +02008885
Denis Vlasenko38f63192007-01-22 09:03:07 +00008886#if ENABLE_FEATURE_EDITING
Denys Vlasenkoe45af7a2011-09-04 16:15:24 +02008887 G.line_input_state = new_line_input_t(FOR_SHELL);
Denis Vlasenko8e1c7152007-01-22 07:21:38 +00008888#endif
Denys Vlasenko99862cb2010-09-12 17:34:13 +02008889
Eric Andersen94ac2442001-05-22 19:05:18 +00008890 /* Initialize some more globals to non-zero values */
Mike Frysinger67c1c7b2009-04-24 06:26:18 +00008891 cmdedit_update_prompt();
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +00008892
Denys Vlasenkoe9abe752016-08-19 20:15:26 +02008893 die_func = restore_ttypgrp_and__exit;
Denis Vlasenkoed782372009-04-10 00:45:02 +00008894
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00008895 /* Shell is non-interactive at first. We need to call
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02008896 * install_special_sighandlers() if we are going to execute "sh <script>",
Denis Vlasenkod3f973e2009-04-06 10:21:42 +00008897 * "sh -c <cmds>" or login shell's /etc/profile and friends.
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02008898 * If we later decide that we are interactive, we run install_special_sighandlers()
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00008899 * in order to intercept (more) signals.
8900 */
8901
8902 /* Parse options */
Mike Frysinger19a7ea12009-03-28 13:02:11 +00008903 /* http://www.opengroup.org/onlinepubs/9699919799/utilities/sh.html */
Denys Vlasenkof58f7052011-05-12 02:10:33 +02008904 flags = (argv[0] && argv[0][0] == '-') ? OPT_login : 0;
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02008905 builtin_argc = 0;
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00008906 while (1) {
Denys Vlasenko9fda6092017-07-14 13:36:48 +02008907 opt = getopt(argc, argv, "+c:exinsl"
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00008908#if !BB_MMU
Denis Vlasenkobc569742009-04-12 20:35:19 +00008909 "<:$:R:V:"
8910# if ENABLE_HUSH_FUNCTIONS
8911 "F:"
8912# endif
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00008913#endif
8914 );
8915 if (opt <= 0)
8916 break;
Eric Andersen25f27032001-04-26 23:22:31 +00008917 switch (opt) {
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00008918 case 'c':
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02008919 /* Possibilities:
8920 * sh ... -c 'script'
8921 * sh ... -c 'script' ARG0 [ARG1...]
8922 * On NOMMU, if builtin_argc != 0,
Denys Vlasenko17323a62010-01-28 01:57:05 +01008923 * sh ... -c 'builtin' BARGV... "" ARG0 [ARG1...]
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02008924 * "" needs to be replaced with NULL
8925 * and BARGV vector fed to builtin function.
Denys Vlasenko17323a62010-01-28 01:57:05 +01008926 * Note: the form without ARG0 never happens:
8927 * sh ... -c 'builtin' BARGV... ""
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02008928 */
Denys Vlasenkodea47882009-10-09 15:40:49 +02008929 if (!G.root_pid) {
Denis Vlasenko46f9b6d2009-04-05 10:39:03 +00008930 G.root_pid = getpid();
Denys Vlasenkodea47882009-10-09 15:40:49 +02008931 G.root_ppid = getppid();
8932 }
Denis Vlasenko87a86552008-07-29 19:43:10 +00008933 G.global_argv = argv + optind;
8934 G.global_argc = argc - optind;
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02008935 if (builtin_argc) {
8936 /* -c 'builtin' [BARGV...] "" ARG0 [ARG1...] */
8937 const struct built_in_command *x;
8938
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02008939 install_special_sighandlers();
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02008940 x = find_builtin(optarg);
8941 if (x) { /* paranoia */
8942 G.global_argc -= builtin_argc; /* skip [BARGV...] "" */
8943 G.global_argv += builtin_argc;
8944 G.global_argv[-1] = NULL; /* replace "" */
Denys Vlasenko8ee2ada2011-02-07 02:03:51 +01008945 fflush_all();
Denys Vlasenko17323a62010-01-28 01:57:05 +01008946 G.last_exitcode = x->b_function(argv + optind - 1);
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02008947 }
8948 goto final_return;
8949 }
8950 if (!G.global_argv[0]) {
8951 /* -c 'script' (no params): prevent empty $0 */
8952 G.global_argv--; /* points to argv[i] of 'script' */
8953 G.global_argv[0] = argv[0];
Denys Vlasenko5ae8f1c2010-05-22 06:32:11 +02008954 G.global_argc++;
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02008955 } /* else -c 'script' ARG0 [ARG1...]: $0 is ARG0 */
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02008956 install_special_sighandlers();
Denis Vlasenkob6e65562009-04-03 16:49:04 +00008957 parse_and_run_string(optarg);
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00008958 goto final_return;
8959 case 'i':
Denis Vlasenkoc666f712007-05-16 22:18:54 +00008960 /* Well, we cannot just declare interactiveness,
8961 * we have to have some stuff (ctty, etc) */
Denis Vlasenko60b392f2009-04-03 19:14:32 +00008962 /* G_interactive_fd++; */
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00008963 break;
Mike Frysinger19a7ea12009-03-28 13:02:11 +00008964 case 's':
8965 /* "-s" means "read from stdin", but this is how we always
8966 * operate, so simply do nothing here. */
8967 break;
Denys Vlasenkof58f7052011-05-12 02:10:33 +02008968 case 'l':
8969 flags |= OPT_login;
8970 break;
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00008971#if !BB_MMU
Denis Vlasenko50f3aa42009-04-07 10:52:40 +00008972 case '<': /* "big heredoc" support */
Denys Vlasenko729ecb82010-06-07 14:14:26 +02008973 full_write1_str(optarg);
Denis Vlasenko50f3aa42009-04-07 10:52:40 +00008974 _exit(0);
Denys Vlasenkoe89a2412010-01-12 15:19:31 +01008975 case '$': {
8976 unsigned long long empty_trap_mask;
8977
Denis Vlasenko34e573d2009-04-06 12:56:28 +00008978 G.root_pid = bb_strtou(optarg, &optarg, 16);
8979 optarg++;
Denys Vlasenkodea47882009-10-09 15:40:49 +02008980 G.root_ppid = bb_strtou(optarg, &optarg, 16);
8981 optarg++;
Denis Vlasenko34e573d2009-04-06 12:56:28 +00008982 G.last_bg_pid = bb_strtou(optarg, &optarg, 16);
8983 optarg++;
Denis Vlasenkoab2b0642009-04-06 18:42:11 +00008984 G.last_exitcode = bb_strtou(optarg, &optarg, 16);
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02008985 optarg++;
8986 builtin_argc = bb_strtou(optarg, &optarg, 16);
Denys Vlasenkoe89a2412010-01-12 15:19:31 +01008987 optarg++;
8988 empty_trap_mask = bb_strtoull(optarg, &optarg, 16);
8989 if (empty_trap_mask != 0) {
Denys Vlasenko4ee824f2017-07-03 01:22:13 +02008990 IF_HUSH_TRAP(int sig;)
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02008991 install_special_sighandlers();
Denys Vlasenko4ee824f2017-07-03 01:22:13 +02008992# if ENABLE_HUSH_TRAP
Denys Vlasenko7a85c602017-01-08 17:40:18 +01008993 G_traps = xzalloc(sizeof(G_traps[0]) * NSIG);
Denys Vlasenkoe89a2412010-01-12 15:19:31 +01008994 for (sig = 1; sig < NSIG; sig++) {
8995 if (empty_trap_mask & (1LL << sig)) {
Denys Vlasenko7a85c602017-01-08 17:40:18 +01008996 G_traps[sig] = xzalloc(1); /* == xstrdup(""); */
Denys Vlasenko0806e402011-05-12 23:06:20 +02008997 install_sighandler(sig, SIG_IGN);
Denys Vlasenkoe89a2412010-01-12 15:19:31 +01008998 }
8999 }
Denys Vlasenko4ee824f2017-07-03 01:22:13 +02009000# endif
Denys Vlasenkoe89a2412010-01-12 15:19:31 +01009001 }
Denis Vlasenkod3f973e2009-04-06 10:21:42 +00009002# if ENABLE_HUSH_LOOPS
Denis Vlasenko34e573d2009-04-06 12:56:28 +00009003 optarg++;
9004 G.depth_of_loop = bb_strtou(optarg, &optarg, 16);
Denis Vlasenkod3f973e2009-04-06 10:21:42 +00009005# endif
Denis Vlasenko34e573d2009-04-06 12:56:28 +00009006 break;
Denys Vlasenkoe89a2412010-01-12 15:19:31 +01009007 }
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00009008 case 'R':
9009 case 'V':
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02009010 set_local_var(xstrdup(optarg), opt == 'R' ? SETFLAG_MAKE_RO : 0);
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00009011 break;
Denis Vlasenkobc569742009-04-12 20:35:19 +00009012# if ENABLE_HUSH_FUNCTIONS
9013 case 'F': {
9014 struct function *funcp = new_function(optarg);
9015 /* funcp->name is already set to optarg */
9016 /* funcp->body is set to NULL. It's a special case. */
9017 funcp->body_as_string = argv[optind];
9018 optind++;
9019 break;
9020 }
9021# endif
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00009022#endif
Mike Frysingerad88d5a2009-03-28 13:44:51 +00009023 case 'n':
9024 case 'x':
Denys Vlasenko9fda6092017-07-14 13:36:48 +02009025 case 'e':
Denys Vlasenko6696eac2010-11-14 02:01:50 +01009026 if (set_mode(1, opt, NULL) == 0) /* no error */
Mike Frysingerad88d5a2009-03-28 13:44:51 +00009027 break;
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00009028 default:
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00009029#ifndef BB_VER
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00009030 fprintf(stderr, "Usage: sh [FILE]...\n"
9031 " or: sh -c command [args]...\n\n");
9032 exit(EXIT_FAILURE);
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00009033#else
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00009034 bb_show_usage();
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00009035#endif
Eric Andersen25f27032001-04-26 23:22:31 +00009036 }
Denis Vlasenkof9375282009-04-05 19:13:39 +00009037 } /* option parsing loop */
Denis Vlasenko46f9b6d2009-04-05 10:39:03 +00009038
Denys Vlasenkof58f7052011-05-12 02:10:33 +02009039 /* Skip options. Try "hush -l": $1 should not be "-l"! */
9040 G.global_argc = argc - (optind - 1);
9041 G.global_argv = argv + (optind - 1);
9042 G.global_argv[0] = argv[0];
9043
Denys Vlasenkodea47882009-10-09 15:40:49 +02009044 if (!G.root_pid) {
Denis Vlasenko46f9b6d2009-04-05 10:39:03 +00009045 G.root_pid = getpid();
Denys Vlasenkodea47882009-10-09 15:40:49 +02009046 G.root_ppid = getppid();
9047 }
Denis Vlasenkof9375282009-04-05 19:13:39 +00009048
9049 /* If we are login shell... */
Denys Vlasenkof58f7052011-05-12 02:10:33 +02009050 if (flags & OPT_login) {
Denis Vlasenko46f9b6d2009-04-05 10:39:03 +00009051 FILE *input;
Denis Vlasenko46f9b6d2009-04-05 10:39:03 +00009052 debug_printf("sourcing /etc/profile\n");
9053 input = fopen_for_read("/etc/profile");
9054 if (input != NULL) {
Denys Vlasenko7b25b1c2016-08-20 15:58:34 +02009055 remember_FILE(input);
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02009056 install_special_sighandlers();
Denis Vlasenko46f9b6d2009-04-05 10:39:03 +00009057 parse_and_run_file(input);
Denys Vlasenko7b25b1c2016-08-20 15:58:34 +02009058 fclose_and_forget(input);
Denis Vlasenko46f9b6d2009-04-05 10:39:03 +00009059 }
Denis Vlasenkof9375282009-04-05 19:13:39 +00009060 /* bash: after sourcing /etc/profile,
9061 * tries to source (in the given order):
9062 * ~/.bash_profile, ~/.bash_login, ~/.profile,
Denys Vlasenko28a105d2009-06-01 11:26:30 +02009063 * stopping on first found. --noprofile turns this off.
Denis Vlasenkof9375282009-04-05 19:13:39 +00009064 * bash also sources ~/.bash_logout on exit.
9065 * If called as sh, skips .bash_XXX files.
9066 */
Denis Vlasenko46f9b6d2009-04-05 10:39:03 +00009067 }
9068
Denys Vlasenkof58f7052011-05-12 02:10:33 +02009069 if (G.global_argv[1]) {
Denis Vlasenkof9375282009-04-05 19:13:39 +00009070 FILE *input;
9071 /*
Denis Vlasenkod3f973e2009-04-06 10:21:42 +00009072 * "bash <script>" (which is never interactive (unless -i?))
9073 * sources $BASH_ENV here (without scanning $PATH).
Denis Vlasenkof9375282009-04-05 19:13:39 +00009074 * If called as sh, does the same but with $ENV.
Denys Vlasenko2eb0a7e2016-10-27 11:28:59 +02009075 * Also NB, per POSIX, $ENV should undergo parameter expansion.
Denis Vlasenkof9375282009-04-05 19:13:39 +00009076 */
Denys Vlasenkof58f7052011-05-12 02:10:33 +02009077 G.global_argc--;
9078 G.global_argv++;
9079 debug_printf("running script '%s'\n", G.global_argv[0]);
Denys Vlasenkob7adf7a2016-10-25 17:00:13 +02009080 xfunc_error_retval = 127; /* for "hush /does/not/exist" case */
Denys Vlasenkof58f7052011-05-12 02:10:33 +02009081 input = xfopen_for_read(G.global_argv[0]);
Denys Vlasenkob7adf7a2016-10-25 17:00:13 +02009082 xfunc_error_retval = 1;
Denys Vlasenko7b25b1c2016-08-20 15:58:34 +02009083 remember_FILE(input);
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02009084 install_special_sighandlers();
Denis Vlasenkof9375282009-04-05 19:13:39 +00009085 parse_and_run_file(input);
9086#if ENABLE_FEATURE_CLEAN_UP
Denys Vlasenko7b25b1c2016-08-20 15:58:34 +02009087 fclose_and_forget(input);
Denis Vlasenkof9375282009-04-05 19:13:39 +00009088#endif
9089 goto final_return;
9090 }
9091
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00009092 /* Up to here, shell was non-interactive. Now it may become one.
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02009093 * NB: don't forget to (re)run install_special_sighandlers() as needed.
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00009094 */
Denis Vlasenkof9375282009-04-05 19:13:39 +00009095
Denys Vlasenko28a105d2009-06-01 11:26:30 +02009096 /* A shell is interactive if the '-i' flag was given,
9097 * or if all of the following conditions are met:
Denis Vlasenko55b2de72007-04-18 17:21:28 +00009098 * no -c command
Eric Andersen25f27032001-04-26 23:22:31 +00009099 * no arguments remaining or the -s flag given
9100 * standard input is a terminal
9101 * standard output is a terminal
Denis Vlasenkof9375282009-04-05 19:13:39 +00009102 * Refer to Posix.2, the description of the 'sh' utility.
9103 */
9104#if ENABLE_HUSH_JOB
9105 if (isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)) {
Mike Frysinger38478a62009-05-20 04:48:06 -04009106 G_saved_tty_pgrp = tcgetpgrp(STDIN_FILENO);
9107 debug_printf("saved_tty_pgrp:%d\n", G_saved_tty_pgrp);
9108 if (G_saved_tty_pgrp < 0)
9109 G_saved_tty_pgrp = 0;
Denis Vlasenkoc8653f62009-04-27 23:29:14 +00009110
9111 /* try to dup stdin to high fd#, >= 255 */
Denys Vlasenko2db74612017-07-07 22:07:28 +02009112 G_interactive_fd = fcntl_F_DUPFD(STDIN_FILENO, 254);
Denis Vlasenkoc8653f62009-04-27 23:29:14 +00009113 if (G_interactive_fd < 0) {
9114 /* try to dup to any fd */
9115 G_interactive_fd = dup(STDIN_FILENO);
Denis Vlasenko60b392f2009-04-03 19:14:32 +00009116 if (G_interactive_fd < 0) {
Denis Vlasenkoc8653f62009-04-27 23:29:14 +00009117 /* give up */
9118 G_interactive_fd = 0;
Mike Frysinger38478a62009-05-20 04:48:06 -04009119 G_saved_tty_pgrp = 0;
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00009120 }
9121 }
Denis Vlasenkoc8653f62009-04-27 23:29:14 +00009122// TODO: track & disallow any attempts of user
9123// to (inadvertently) close/redirect G_interactive_fd
Eric Andersen25f27032001-04-26 23:22:31 +00009124 }
Denis Vlasenkof9375282009-04-05 19:13:39 +00009125 debug_printf("interactive_fd:%d\n", G_interactive_fd);
Denis Vlasenko60b392f2009-04-03 19:14:32 +00009126 if (G_interactive_fd) {
Denis Vlasenkof9375282009-04-05 19:13:39 +00009127 close_on_exec_on(G_interactive_fd);
Denis Vlasenkoc8653f62009-04-27 23:29:14 +00009128
Mike Frysinger38478a62009-05-20 04:48:06 -04009129 if (G_saved_tty_pgrp) {
Denis Vlasenkoc8653f62009-04-27 23:29:14 +00009130 /* If we were run as 'hush &', sleep until we are
9131 * in the foreground (tty pgrp == our pgrp).
9132 * If we get started under a job aware app (like bash),
9133 * make sure we are now in charge so we don't fight over
9134 * who gets the foreground */
9135 while (1) {
9136 pid_t shell_pgrp = getpgrp();
Mike Frysinger38478a62009-05-20 04:48:06 -04009137 G_saved_tty_pgrp = tcgetpgrp(G_interactive_fd);
9138 if (G_saved_tty_pgrp == shell_pgrp)
Denis Vlasenkoc8653f62009-04-27 23:29:14 +00009139 break;
9140 /* send TTIN to ourself (should stop us) */
9141 kill(- shell_pgrp, SIGTTIN);
9142 }
Denis Vlasenkof9375282009-04-05 19:13:39 +00009143 }
Denis Vlasenkoc8653f62009-04-27 23:29:14 +00009144
Denys Vlasenkof58f7052011-05-12 02:10:33 +02009145 /* Install more signal handlers */
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02009146 install_special_sighandlers();
Denis Vlasenkoc8653f62009-04-27 23:29:14 +00009147
Mike Frysinger38478a62009-05-20 04:48:06 -04009148 if (G_saved_tty_pgrp) {
Denis Vlasenkoc8653f62009-04-27 23:29:14 +00009149 /* Set other signals to restore saved_tty_pgrp */
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02009150 install_fatal_sighandlers();
Denis Vlasenkoc8653f62009-04-27 23:29:14 +00009151 /* Put ourselves in our own process group
9152 * (bash, too, does this only if ctty is available) */
9153 bb_setpgrp(); /* is the same as setpgid(our_pid, our_pid); */
9154 /* Grab control of the terminal */
9155 tcsetpgrp(G_interactive_fd, getpid());
9156 }
Denys Vlasenko550bf5b2015-10-09 16:42:57 +02009157 enable_restore_tty_pgrp_on_exit();
Denys Vlasenko4840ae82011-09-04 15:28:03 +02009158
9159# if ENABLE_HUSH_SAVEHISTORY && MAX_HISTORY > 0
9160 {
9161 const char *hp = get_local_var_value("HISTFILE");
9162 if (!hp) {
9163 hp = get_local_var_value("HOME");
9164 if (hp)
9165 hp = concat_path_file(hp, ".hush_history");
9166 } else {
9167 hp = xstrdup(hp);
9168 }
9169 if (hp) {
9170 G.line_input_state->hist_file = hp;
Denys Vlasenko4840ae82011-09-04 15:28:03 +02009171 //set_local_var(xasprintf("HISTFILE=%s", ...));
9172 }
9173# if ENABLE_FEATURE_SH_HISTFILESIZE
9174 hp = get_local_var_value("HISTFILESIZE");
9175 G.line_input_state->max_history = size_from_HISTFILESIZE(hp);
9176# endif
9177 }
9178# endif
Denys Vlasenkoe89a2412010-01-12 15:19:31 +01009179 } else {
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02009180 install_special_sighandlers();
Denys Vlasenkoe89a2412010-01-12 15:19:31 +01009181 }
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00009182#elif ENABLE_HUSH_INTERACTIVE
Denis Vlasenkof9375282009-04-05 19:13:39 +00009183 /* No job control compiled in, only prompt/line editing */
9184 if (isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)) {
Denys Vlasenko2db74612017-07-07 22:07:28 +02009185 G_interactive_fd = fcntl_F_DUPFD(STDIN_FILENO, 254);
Denis Vlasenko60b392f2009-04-03 19:14:32 +00009186 if (G_interactive_fd < 0) {
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00009187 /* try to dup to any fd */
Denis Vlasenko60b392f2009-04-03 19:14:32 +00009188 G_interactive_fd = dup(STDIN_FILENO);
9189 if (G_interactive_fd < 0)
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00009190 /* give up */
Denis Vlasenko60b392f2009-04-03 19:14:32 +00009191 G_interactive_fd = 0;
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00009192 }
9193 }
Denis Vlasenko60b392f2009-04-03 19:14:32 +00009194 if (G_interactive_fd) {
Denis Vlasenkof9375282009-04-05 19:13:39 +00009195 close_on_exec_on(G_interactive_fd);
Denis Vlasenkof9375282009-04-05 19:13:39 +00009196 }
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02009197 install_special_sighandlers();
Denis Vlasenkof9375282009-04-05 19:13:39 +00009198#else
9199 /* We have interactiveness code disabled */
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02009200 install_special_sighandlers();
Denis Vlasenkof9375282009-04-05 19:13:39 +00009201#endif
9202 /* bash:
9203 * if interactive but not a login shell, sources ~/.bashrc
9204 * (--norc turns this off, --rcfile <file> overrides)
9205 */
9206
9207 if (!ENABLE_FEATURE_SH_EXTRA_QUIET && G_interactive_fd) {
Denys Vlasenkoc34c0332009-09-29 12:25:30 +02009208 /* note: ash and hush share this string */
9209 printf("\n\n%s %s\n"
9210 IF_HUSH_HELP("Enter 'help' for a list of built-in commands.\n")
9211 "\n",
9212 bb_banner,
9213 "hush - the humble shell"
9214 );
Mike Frysingerb2705e12009-03-23 08:44:02 +00009215 }
9216
Denis Vlasenkof9375282009-04-05 19:13:39 +00009217 parse_and_run_file(stdin);
Eric Andersen25f27032001-04-26 23:22:31 +00009218
Denis Vlasenkod76c0492007-05-25 02:16:25 +00009219 final_return:
Denis Vlasenkoab2b0642009-04-06 18:42:11 +00009220 hush_exit(G.last_exitcode);
Eric Andersen25f27032001-04-26 23:22:31 +00009221}
Denis Vlasenko96702ca2007-11-23 23:28:55 +00009222
9223
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009224/*
9225 * Built-ins
9226 */
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02009227static int FAST_FUNC builtin_true(char **argv UNUSED_PARAM)
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009228{
9229 return 0;
9230}
9231
Denys Vlasenko265062d2017-01-10 15:13:30 +01009232#if ENABLE_HUSH_TEST || ENABLE_HUSH_ECHO || ENABLE_HUSH_PRINTF || ENABLE_HUSH_KILL
Denys Vlasenko8bc7f2c2009-10-19 13:20:52 +02009233static int run_applet_main(char **argv, int (*applet_main_func)(int argc, char **argv))
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009234{
Denys Vlasenkod4e4fdb2017-07-03 21:31:16 +02009235 int argc = string_array_len(argv);
9236 return applet_main_func(argc, argv);
Mike Frysingerccb19592009-10-15 03:31:15 -04009237}
Denys Vlasenko265062d2017-01-10 15:13:30 +01009238#endif
Kang-Che Sung027d3ab2017-01-11 14:18:15 +01009239#if ENABLE_HUSH_TEST || BASH_TEST2
Mike Frysingerccb19592009-10-15 03:31:15 -04009240static int FAST_FUNC builtin_test(char **argv)
9241{
Denys Vlasenkoc0836532009-10-19 13:13:06 +02009242 return run_applet_main(argv, test_main);
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009243}
Denys Vlasenko265062d2017-01-10 15:13:30 +01009244#endif
Denys Vlasenko1cc68042017-01-09 17:10:04 +01009245#if ENABLE_HUSH_ECHO
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02009246static int FAST_FUNC builtin_echo(char **argv)
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009247{
Denys Vlasenkoc0836532009-10-19 13:13:06 +02009248 return run_applet_main(argv, echo_main);
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009249}
Denys Vlasenko1cc68042017-01-09 17:10:04 +01009250#endif
Denys Vlasenko1125d7d2017-01-08 17:19:38 +01009251#if ENABLE_HUSH_PRINTF
Mike Frysinger4ebc76c2009-10-15 03:32:39 -04009252static int FAST_FUNC builtin_printf(char **argv)
9253{
Denys Vlasenkoc0836532009-10-19 13:13:06 +02009254 return run_applet_main(argv, printf_main);
Mike Frysinger4ebc76c2009-10-15 03:32:39 -04009255}
9256#endif
9257
Denys Vlasenkoa1184af2017-01-10 15:58:02 +01009258#if ENABLE_HUSH_HELP
9259static int FAST_FUNC builtin_help(char **argv UNUSED_PARAM)
9260{
9261 const struct built_in_command *x;
9262
9263 printf(
9264 "Built-in commands:\n"
9265 "------------------\n");
9266 for (x = bltins1; x != &bltins1[ARRAY_SIZE(bltins1)]; x++) {
9267 if (x->b_descr)
9268 printf("%-10s%s\n", x->b_cmd, x->b_descr);
9269 }
9270 return EXIT_SUCCESS;
9271}
9272#endif
9273
9274#if MAX_HISTORY && ENABLE_FEATURE_EDITING
9275static int FAST_FUNC builtin_history(char **argv UNUSED_PARAM)
9276{
9277 show_history(G.line_input_state);
9278 return EXIT_SUCCESS;
9279}
9280#endif
9281
Denys Vlasenkob131cce2010-05-20 03:39:43 +02009282static char **skip_dash_dash(char **argv)
9283{
9284 argv++;
9285 if (argv[0] && argv[0][0] == '-' && argv[0][1] == '-' && argv[0][2] == '\0')
9286 argv++;
9287 return argv;
9288}
9289
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02009290static int FAST_FUNC builtin_cd(char **argv)
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009291{
Denys Vlasenkob131cce2010-05-20 03:39:43 +02009292 const char *newdir;
9293
9294 argv = skip_dash_dash(argv);
9295 newdir = argv[0];
Denis Vlasenkobfbc9712009-04-06 12:04:42 +00009296 if (newdir == NULL) {
Denis Vlasenkob6e65562009-04-03 16:49:04 +00009297 /* bash does nothing (exitcode 0) if HOME is ""; if it's unset,
Denis Vlasenko0b677d82009-04-10 13:49:10 +00009298 * bash says "bash: cd: HOME not set" and does nothing
9299 * (exitcode 1)
Denis Vlasenkob6e65562009-04-03 16:49:04 +00009300 */
Denys Vlasenko90a99042009-09-06 02:36:23 +02009301 const char *home = get_local_var_value("HOME");
9302 newdir = home ? home : "/";
Denis Vlasenkob0a64782009-04-06 11:33:07 +00009303 }
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009304 if (chdir(newdir)) {
Denis Vlasenkobfbc9712009-04-06 12:04:42 +00009305 /* Mimic bash message exactly */
9306 bb_perror_msg("cd: %s", newdir);
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009307 return EXIT_FAILURE;
9308 }
Denys Vlasenko6db47842009-09-05 20:15:17 +02009309 /* Read current dir (get_cwd(1) is inside) and set PWD.
9310 * Note: do not enforce exporting. If PWD was unset or unexported,
9311 * set it again, but do not export. bash does the same.
9312 */
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02009313 set_pwd_var(/*flag:*/ 0);
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009314 return EXIT_SUCCESS;
9315}
9316
Denys Vlasenkoa1184af2017-01-10 15:58:02 +01009317static int FAST_FUNC builtin_pwd(char **argv UNUSED_PARAM)
9318{
9319 puts(get_cwd(0));
9320 return EXIT_SUCCESS;
9321}
9322
9323static int FAST_FUNC builtin_eval(char **argv)
9324{
9325 int rcode = EXIT_SUCCESS;
9326
9327 argv = skip_dash_dash(argv);
9328 if (*argv) {
9329 char *str = expand_strvec_to_string(argv);
9330 /* bash:
9331 * eval "echo Hi; done" ("done" is syntax error):
9332 * "echo Hi" will not execute too.
9333 */
9334 parse_and_run_string(str);
9335 free(str);
9336 rcode = G.last_exitcode;
9337 }
9338 return rcode;
9339}
9340
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02009341static int FAST_FUNC builtin_exec(char **argv)
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009342{
Denys Vlasenkob131cce2010-05-20 03:39:43 +02009343 argv = skip_dash_dash(argv);
9344 if (argv[0] == NULL)
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009345 return EXIT_SUCCESS; /* bash does this */
Denys Vlasenkof37eb392009-10-18 11:46:35 +02009346
Denys Vlasenkof37eb392009-10-18 11:46:35 +02009347 /* Careful: we can end up here after [v]fork. Do not restore
9348 * tty pgrp then, only top-level shell process does that */
9349 if (G_saved_tty_pgrp && getpid() == G.root_pid)
9350 tcsetpgrp(G_interactive_fd, G_saved_tty_pgrp);
9351
Denys Vlasenko5b3d2eb2017-07-31 18:02:28 +02009352 /* Saved-redirect fds, script fds and G_interactive_fd are still
9353 * open here. However, they are all CLOEXEC, and execv below
9354 * closes them. Try interactive "exec ls -l /proc/self/fd",
9355 * it should show no extra open fds in the "ls" process.
9356 * If we'd try to run builtins/NOEXECs, this would need improving.
9357 */
9358 //close_saved_fds_and_FILE_fds();
9359
Denys Vlasenko3ef4f772009-10-19 23:09:06 +02009360 /* TODO: if exec fails, bash does NOT exit! We do.
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +02009361 * We'll need to undo trap cleanup (it's inside execvp_or_die)
Denys Vlasenko3ef4f772009-10-19 23:09:06 +02009362 * and tcsetpgrp, and this is inherently racy.
9363 */
9364 execvp_or_die(argv);
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009365}
9366
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02009367static int FAST_FUNC builtin_exit(char **argv)
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009368{
Denis Vlasenkocd418a22009-04-06 18:08:35 +00009369 debug_printf_exec("%s()\n", __func__);
Denis Vlasenko40e84372009-04-18 11:23:38 +00009370
9371 /* interactive bash:
9372 * # trap "echo EEE" EXIT
9373 * # exit
9374 * exit
9375 * There are stopped jobs.
9376 * (if there are _stopped_ jobs, running ones don't count)
9377 * # exit
9378 * exit
Denys Vlasenko6830ade2013-01-15 13:58:01 +01009379 * EEE (then bash exits)
Denis Vlasenko40e84372009-04-18 11:23:38 +00009380 *
Denys Vlasenkoa110c902010-09-12 15:38:04 +02009381 * TODO: we can use G.exiting = -1 as indicator "last cmd was exit"
Denis Vlasenko40e84372009-04-18 11:23:38 +00009382 */
Denis Vlasenkoefea9d22009-04-09 13:43:11 +00009383
9384 /* note: EXIT trap is run by hush_exit */
Denys Vlasenkob131cce2010-05-20 03:39:43 +02009385 argv = skip_dash_dash(argv);
9386 if (argv[0] == NULL)
Denis Vlasenkoab2b0642009-04-06 18:42:11 +00009387 hush_exit(G.last_exitcode);
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009388 /* mimic bash: exit 123abc == exit 255 + error msg */
9389 xfunc_error_retval = 255;
9390 /* bash: exit -2 == exit 254, no error msg */
Denys Vlasenkob131cce2010-05-20 03:39:43 +02009391 hush_exit(xatoi(argv[0]) & 0xff);
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009392}
9393
Denys Vlasenkoa1184af2017-01-10 15:58:02 +01009394#if ENABLE_HUSH_TYPE
9395/* http://www.opengroup.org/onlinepubs/9699919799/utilities/type.html */
9396static int FAST_FUNC builtin_type(char **argv)
9397{
9398 int ret = EXIT_SUCCESS;
9399
9400 while (*++argv) {
9401 const char *type;
9402 char *path = NULL;
9403
9404 if (0) {} /* make conditional compile easier below */
9405 /*else if (find_alias(*argv))
9406 type = "an alias";*/
9407#if ENABLE_HUSH_FUNCTIONS
9408 else if (find_function(*argv))
9409 type = "a function";
9410#endif
9411 else if (find_builtin(*argv))
9412 type = "a shell builtin";
9413 else if ((path = find_in_path(*argv)) != NULL)
9414 type = path;
9415 else {
9416 bb_error_msg("type: %s: not found", *argv);
9417 ret = EXIT_FAILURE;
9418 continue;
9419 }
9420
9421 printf("%s is %s\n", *argv, type);
9422 free(path);
9423 }
9424
9425 return ret;
9426}
9427#endif
9428
9429#if ENABLE_HUSH_READ
9430/* Interruptibility of read builtin in bash
9431 * (tested on bash-4.2.8 by sending signals (not by ^C)):
9432 *
9433 * Empty trap makes read ignore corresponding signal, for any signal.
9434 *
9435 * SIGINT:
9436 * - terminates non-interactive shell;
9437 * - interrupts read in interactive shell;
9438 * if it has non-empty trap:
9439 * - executes trap and returns to command prompt in interactive shell;
9440 * - executes trap and returns to read in non-interactive shell;
9441 * SIGTERM:
9442 * - is ignored (does not interrupt) read in interactive shell;
9443 * - terminates non-interactive shell;
9444 * if it has non-empty trap:
9445 * - executes trap and returns to read;
9446 * SIGHUP:
9447 * - terminates shell (regardless of interactivity);
9448 * if it has non-empty trap:
9449 * - executes trap and returns to read;
Denys Vlasenkof5470412017-05-22 19:34:45 +02009450 * SIGCHLD from children:
9451 * - does not interrupt read regardless of interactivity:
9452 * try: sleep 1 & read x; echo $x
Denys Vlasenkoa1184af2017-01-10 15:58:02 +01009453 */
9454static int FAST_FUNC builtin_read(char **argv)
9455{
9456 const char *r;
9457 char *opt_n = NULL;
9458 char *opt_p = NULL;
9459 char *opt_t = NULL;
9460 char *opt_u = NULL;
Denys Vlasenko1f41c882017-08-09 13:52:36 +02009461 char *opt_d = NULL; /* optimized out if !BASH */
Denys Vlasenkoa1184af2017-01-10 15:58:02 +01009462 const char *ifs;
9463 int read_flags;
9464
9465 /* "!": do not abort on errors.
9466 * Option string must start with "sr" to match BUILTIN_READ_xxx
9467 */
Denys Vlasenko1f41c882017-08-09 13:52:36 +02009468 read_flags = getopt32(argv,
9469#if BASH_READ_D
9470 "!srn:p:t:u:d:", &opt_n, &opt_p, &opt_t, &opt_u, &opt_d
9471#else
9472 "!srn:p:t:u:", &opt_n, &opt_p, &opt_t, &opt_u
9473#endif
9474 );
Denys Vlasenkoa1184af2017-01-10 15:58:02 +01009475 if (read_flags == (uint32_t)-1)
9476 return EXIT_FAILURE;
9477 argv += optind;
9478 ifs = get_local_var_value("IFS"); /* can be NULL */
9479
9480 again:
9481 r = shell_builtin_read(set_local_var_from_halves,
9482 argv,
9483 ifs,
9484 read_flags,
9485 opt_n,
9486 opt_p,
9487 opt_t,
Denys Vlasenko1f41c882017-08-09 13:52:36 +02009488 opt_u,
9489 opt_d
Denys Vlasenkoa1184af2017-01-10 15:58:02 +01009490 );
9491
9492 if ((uintptr_t)r == 1 && errno == EINTR) {
9493 unsigned sig = check_and_run_traps();
Denys Vlasenkof5470412017-05-22 19:34:45 +02009494 if (sig != SIGINT)
Denys Vlasenkoa1184af2017-01-10 15:58:02 +01009495 goto again;
9496 }
9497
9498 if ((uintptr_t)r > 1) {
9499 bb_error_msg("%s", r);
9500 r = (char*)(uintptr_t)1;
9501 }
9502
9503 return (uintptr_t)r;
9504}
9505#endif
9506
9507#if ENABLE_HUSH_UMASK
9508static int FAST_FUNC builtin_umask(char **argv)
9509{
9510 int rc;
9511 mode_t mask;
9512
9513 rc = 1;
9514 mask = umask(0);
9515 argv = skip_dash_dash(argv);
9516 if (argv[0]) {
9517 mode_t old_mask = mask;
9518
9519 /* numeric umasks are taken as-is */
9520 /* symbolic umasks are inverted: "umask a=rx" calls umask(222) */
9521 if (!isdigit(argv[0][0]))
9522 mask ^= 0777;
9523 mask = bb_parse_mode(argv[0], mask);
9524 if (!isdigit(argv[0][0]))
9525 mask ^= 0777;
9526 if ((unsigned)mask > 0777) {
9527 mask = old_mask;
9528 /* bash messages:
9529 * bash: umask: 'q': invalid symbolic mode operator
9530 * bash: umask: 999: octal number out of range
9531 */
9532 bb_error_msg("%s: invalid mode '%s'", "umask", argv[0]);
9533 rc = 0;
9534 }
9535 } else {
9536 /* Mimic bash */
9537 printf("%04o\n", (unsigned) mask);
9538 /* fall through and restore mask which we set to 0 */
9539 }
9540 umask(mask);
9541
9542 return !rc; /* rc != 0 - success */
9543}
9544#endif
9545
Denys Vlasenko41ade052017-01-08 18:56:24 +01009546#if ENABLE_HUSH_EXPORT || ENABLE_HUSH_TRAP
Denis Vlasenko38e626d2009-04-18 12:58:19 +00009547static void print_escaped(const char *s)
9548{
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02009549 if (*s == '\'')
9550 goto squote;
Denis Vlasenko38e626d2009-04-18 12:58:19 +00009551 do {
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +02009552 const char *p = strchrnul(s, '\'');
9553 /* print 'xxxx', possibly just '' */
9554 printf("'%.*s'", (int)(p - s), s);
9555 if (*p == '\0')
9556 break;
9557 s = p;
9558 squote:
Denis Vlasenko38e626d2009-04-18 12:58:19 +00009559 /* s points to '; print "'''...'''" */
9560 putchar('"');
9561 do putchar('\''); while (*++s == '\'');
9562 putchar('"');
9563 } while (*s);
9564}
Denys Vlasenko41ade052017-01-08 18:56:24 +01009565#endif
Denis Vlasenko38e626d2009-04-18 12:58:19 +00009566
Denys Vlasenko1e660422017-07-17 21:10:50 +02009567#if ENABLE_HUSH_EXPORT || ENABLE_HUSH_LOCAL || ENABLE_HUSH_READONLY
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02009568static int helper_export_local(char **argv, unsigned flags)
Denys Vlasenko295fef82009-06-03 12:47:26 +02009569{
9570 do {
9571 char *name = *argv;
Denys Vlasenko27c56f12010-09-07 09:56:34 +02009572 char *name_end = strchrnul(name, '=');
Denys Vlasenko295fef82009-06-03 12:47:26 +02009573
9574 /* So far we do not check that name is valid (TODO?) */
9575
Denys Vlasenko27c56f12010-09-07 09:56:34 +02009576 if (*name_end == '\0') {
9577 struct variable *var, **vpp;
Denys Vlasenko295fef82009-06-03 12:47:26 +02009578
Denys Vlasenko27c56f12010-09-07 09:56:34 +02009579 vpp = get_ptr_to_local_var(name, name_end - name);
9580 var = vpp ? *vpp : NULL;
9581
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02009582 if (flags & SETFLAG_UNEXPORT) {
Denys Vlasenko295fef82009-06-03 12:47:26 +02009583 /* export -n NAME (without =VALUE) */
9584 if (var) {
9585 var->flg_export = 0;
9586 debug_printf_env("%s: unsetenv '%s'\n", __func__, name);
9587 unsetenv(name);
9588 } /* else: export -n NOT_EXISTING_VAR: no-op */
9589 continue;
9590 }
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02009591 if (flags & SETFLAG_EXPORT) {
Denys Vlasenko295fef82009-06-03 12:47:26 +02009592 /* export NAME (without =VALUE) */
9593 if (var) {
9594 var->flg_export = 1;
9595 debug_printf_env("%s: putenv '%s'\n", __func__, var->varstr);
9596 putenv(var->varstr);
9597 continue;
9598 }
9599 }
Denys Vlasenko38ef39a2017-07-18 01:40:01 +02009600 if (flags & SETFLAG_MAKE_RO) {
9601 /* readonly NAME (without =VALUE) */
9602 if (var) {
9603 var->flg_read_only = 1;
9604 continue;
9605 }
9606 }
Denys Vlasenko6ec76d82017-01-08 18:40:41 +01009607# if ENABLE_HUSH_LOCAL
Denys Vlasenkob95ee962017-07-17 21:19:53 +02009608 /* Is this "local" bltin? */
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02009609 if (!(flags & (SETFLAG_EXPORT|SETFLAG_UNEXPORT|SETFLAG_MAKE_RO))) {
9610 unsigned lvl = flags >> SETFLAG_LOCAL_SHIFT;
Denys Vlasenkob95ee962017-07-17 21:19:53 +02009611 if (var && var->func_nest_level == lvl) {
9612 /* "local x=abc; ...; local x" - ignore second local decl */
9613 continue;
9614 }
Denys Vlasenko61508d92016-10-02 21:12:02 +02009615 }
Denys Vlasenko6ec76d82017-01-08 18:40:41 +01009616# endif
Denys Vlasenko295fef82009-06-03 12:47:26 +02009617 /* Exporting non-existing variable.
9618 * bash does not put it in environment,
9619 * but remembers that it is exported,
9620 * and does put it in env when it is set later.
Denys Vlasenko1e660422017-07-17 21:10:50 +02009621 * We just set it to "" and export.
9622 */
Denys Vlasenko295fef82009-06-03 12:47:26 +02009623 /* Or, it's "local NAME" (without =VALUE).
Denys Vlasenko1e660422017-07-17 21:10:50 +02009624 * bash sets the value to "".
9625 */
9626 /* Or, it's "readonly NAME" (without =VALUE).
9627 * bash remembers NAME and disallows its creation
9628 * in the future.
9629 */
Denys Vlasenko295fef82009-06-03 12:47:26 +02009630 name = xasprintf("%s=", name);
9631 } else {
9632 /* (Un)exporting/making local NAME=VALUE */
9633 name = xstrdup(name);
9634 }
Denys Vlasenko38ef39a2017-07-18 01:40:01 +02009635 if (set_local_var(name, flags))
9636 return EXIT_FAILURE;
Denys Vlasenko295fef82009-06-03 12:47:26 +02009637 } while (*++argv);
Denys Vlasenko1e660422017-07-17 21:10:50 +02009638 return EXIT_SUCCESS;
Denys Vlasenko295fef82009-06-03 12:47:26 +02009639}
Denys Vlasenko6ec76d82017-01-08 18:40:41 +01009640#endif
Denys Vlasenko295fef82009-06-03 12:47:26 +02009641
Denys Vlasenko6ec76d82017-01-08 18:40:41 +01009642#if ENABLE_HUSH_EXPORT
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02009643static int FAST_FUNC builtin_export(char **argv)
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009644{
Denis Vlasenkoad4bd052009-04-20 22:04:21 +00009645 unsigned opt_unexport;
9646
Denys Vlasenkodf5131c2009-06-07 16:04:17 +02009647#if ENABLE_HUSH_EXPORT_N
9648 /* "!": do not abort on errors */
9649 opt_unexport = getopt32(argv, "!n");
9650 if (opt_unexport == (uint32_t)-1)
9651 return EXIT_FAILURE;
9652 argv += optind;
9653#else
9654 opt_unexport = 0;
9655 argv++;
9656#endif
9657
9658 if (argv[0] == NULL) {
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009659 char **e = environ;
Denis Vlasenko0b677d82009-04-10 13:49:10 +00009660 if (e) {
9661 while (*e) {
9662#if 0
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009663 puts(*e++);
Denis Vlasenko0b677d82009-04-10 13:49:10 +00009664#else
9665 /* ash emits: export VAR='VAL'
9666 * bash: declare -x VAR="VAL"
9667 * we follow ash example */
9668 const char *s = *e++;
9669 const char *p = strchr(s, '=');
9670
9671 if (!p) /* wtf? take next variable */
9672 continue;
9673 /* export var= */
9674 printf("export %.*s", (int)(p - s) + 1, s);
Denis Vlasenko38e626d2009-04-18 12:58:19 +00009675 print_escaped(p + 1);
Denis Vlasenko0b677d82009-04-10 13:49:10 +00009676 putchar('\n');
9677#endif
9678 }
Denys Vlasenko8131eea2009-11-02 14:19:51 +01009679 /*fflush_all(); - done after each builtin anyway */
Denis Vlasenko0b677d82009-04-10 13:49:10 +00009680 }
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009681 return EXIT_SUCCESS;
9682 }
9683
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02009684 return helper_export_local(argv, opt_unexport ? SETFLAG_UNEXPORT : SETFLAG_EXPORT);
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009685}
Denys Vlasenko6ec76d82017-01-08 18:40:41 +01009686#endif
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00009687
Denys Vlasenko295fef82009-06-03 12:47:26 +02009688#if ENABLE_HUSH_LOCAL
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02009689static int FAST_FUNC builtin_local(char **argv)
Denys Vlasenko295fef82009-06-03 12:47:26 +02009690{
9691 if (G.func_nest_level == 0) {
9692 bb_error_msg("%s: not in a function", argv[0]);
9693 return EXIT_FAILURE; /* bash compat */
9694 }
Denys Vlasenko1e660422017-07-17 21:10:50 +02009695 argv++;
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02009696 return helper_export_local(argv, G.func_nest_level << SETFLAG_LOCAL_SHIFT);
Denys Vlasenko295fef82009-06-03 12:47:26 +02009697}
9698#endif
9699
Denys Vlasenko1e660422017-07-17 21:10:50 +02009700#if ENABLE_HUSH_READONLY
9701static int FAST_FUNC builtin_readonly(char **argv)
9702{
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02009703 argv++;
9704 if (*argv == NULL) {
Denys Vlasenko1e660422017-07-17 21:10:50 +02009705 /* bash: readonly [-p]: list all readonly VARs
9706 * (-p has no effect in bash)
9707 */
9708 struct variable *e;
9709 for (e = G.top_var; e; e = e->next) {
9710 if (e->flg_read_only) {
9711//TODO: quote value: readonly VAR='VAL'
9712 printf("readonly %s\n", e->varstr);
9713 }
9714 }
9715 return EXIT_SUCCESS;
9716 }
Denys Vlasenko3bab36b2017-07-18 01:05:24 +02009717 return helper_export_local(argv, SETFLAG_MAKE_RO);
Denys Vlasenko1e660422017-07-17 21:10:50 +02009718}
9719#endif
9720
Denys Vlasenko10d5ece2017-01-08 18:28:43 +01009721#if ENABLE_HUSH_UNSET
Denys Vlasenko61508d92016-10-02 21:12:02 +02009722/* http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#unset */
9723static int FAST_FUNC builtin_unset(char **argv)
9724{
9725 int ret;
9726 unsigned opts;
9727
9728 /* "!": do not abort on errors */
9729 /* "+": stop at 1st non-option */
9730 opts = getopt32(argv, "!+vf");
9731 if (opts == (unsigned)-1)
9732 return EXIT_FAILURE;
9733 if (opts == 3) {
9734 bb_error_msg("unset: -v and -f are exclusive");
9735 return EXIT_FAILURE;
9736 }
9737 argv += optind;
9738
9739 ret = EXIT_SUCCESS;
9740 while (*argv) {
9741 if (!(opts & 2)) { /* not -f */
9742 if (unset_local_var(*argv)) {
9743 /* unset <nonexistent_var> doesn't fail.
9744 * Error is when one tries to unset RO var.
9745 * Message was printed by unset_local_var. */
9746 ret = EXIT_FAILURE;
9747 }
9748 }
Denys Vlasenko10d5ece2017-01-08 18:28:43 +01009749# if ENABLE_HUSH_FUNCTIONS
Denys Vlasenko61508d92016-10-02 21:12:02 +02009750 else {
9751 unset_func(*argv);
9752 }
Denys Vlasenko10d5ece2017-01-08 18:28:43 +01009753# endif
Denys Vlasenko61508d92016-10-02 21:12:02 +02009754 argv++;
9755 }
9756 return ret;
9757}
Denys Vlasenko10d5ece2017-01-08 18:28:43 +01009758#endif
Denys Vlasenko61508d92016-10-02 21:12:02 +02009759
Denys Vlasenko10d5ece2017-01-08 18:28:43 +01009760#if ENABLE_HUSH_SET
Denys Vlasenko61508d92016-10-02 21:12:02 +02009761/* http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#set
9762 * built-in 'set' handler
9763 * SUSv3 says:
9764 * set [-abCefhmnuvx] [-o option] [argument...]
9765 * set [+abCefhmnuvx] [+o option] [argument...]
9766 * set -- [argument...]
9767 * set -o
9768 * set +o
9769 * Implementations shall support the options in both their hyphen and
9770 * plus-sign forms. These options can also be specified as options to sh.
9771 * Examples:
9772 * Write out all variables and their values: set
9773 * Set $1, $2, and $3 and set "$#" to 3: set c a b
9774 * Turn on the -x and -v options: set -xv
9775 * Unset all positional parameters: set --
9776 * Set $1 to the value of x, even if it begins with '-' or '+': set -- "$x"
9777 * Set the positional parameters to the expansion of x, even if x expands
9778 * with a leading '-' or '+': set -- $x
9779 *
9780 * So far, we only support "set -- [argument...]" and some of the short names.
9781 */
9782static int FAST_FUNC builtin_set(char **argv)
9783{
9784 int n;
9785 char **pp, **g_argv;
9786 char *arg = *++argv;
9787
9788 if (arg == NULL) {
9789 struct variable *e;
9790 for (e = G.top_var; e; e = e->next)
9791 puts(e->varstr);
9792 return EXIT_SUCCESS;
9793 }
9794
9795 do {
9796 if (strcmp(arg, "--") == 0) {
9797 ++argv;
9798 goto set_argv;
9799 }
9800 if (arg[0] != '+' && arg[0] != '-')
9801 break;
9802 for (n = 1; arg[n]; ++n) {
9803 if (set_mode((arg[0] == '-'), arg[n], argv[1]))
9804 goto error;
9805 if (arg[n] == 'o' && argv[1])
9806 argv++;
9807 }
9808 } while ((arg = *++argv) != NULL);
9809 /* Now argv[0] is 1st argument */
9810
9811 if (arg == NULL)
9812 return EXIT_SUCCESS;
9813 set_argv:
9814
9815 /* NB: G.global_argv[0] ($0) is never freed/changed */
9816 g_argv = G.global_argv;
9817 if (G.global_args_malloced) {
9818 pp = g_argv;
9819 while (*++pp)
9820 free(*pp);
9821 g_argv[1] = NULL;
9822 } else {
9823 G.global_args_malloced = 1;
9824 pp = xzalloc(sizeof(pp[0]) * 2);
9825 pp[0] = g_argv[0]; /* retain $0 */
9826 g_argv = pp;
9827 }
9828 /* This realloc's G.global_argv */
9829 G.global_argv = pp = add_strings_to_strings(g_argv, argv, /*dup:*/ 1);
9830
Denys Vlasenkod4e4fdb2017-07-03 21:31:16 +02009831 G.global_argc = 1 + string_array_len(pp + 1);
Denys Vlasenko61508d92016-10-02 21:12:02 +02009832
9833 return EXIT_SUCCESS;
9834
9835 /* Nothing known, so abort */
9836 error:
9837 bb_error_msg("set: %s: invalid option", arg);
9838 return EXIT_FAILURE;
9839}
Denys Vlasenko10d5ece2017-01-08 18:28:43 +01009840#endif
Denys Vlasenko61508d92016-10-02 21:12:02 +02009841
9842static int FAST_FUNC builtin_shift(char **argv)
9843{
9844 int n = 1;
9845 argv = skip_dash_dash(argv);
9846 if (argv[0]) {
Denys Vlasenkoe59591a2017-07-06 20:12:44 +02009847 n = bb_strtou(argv[0], NULL, 10);
9848 if (errno || n < 0) {
9849 /* shared string with ash.c */
9850 bb_error_msg("Illegal number: %s", argv[0]);
9851 /*
9852 * ash aborts in this case.
9853 * bash prints error message and set $? to 1.
9854 * Interestingly, for "shift 99999" bash does not
9855 * print error message, but does set $? to 1
9856 * (and does no shifting at all).
9857 */
9858 }
Denys Vlasenko61508d92016-10-02 21:12:02 +02009859 }
9860 if (n >= 0 && n < G.global_argc) {
Denys Vlasenko4e4f88e2017-01-09 07:57:38 +01009861 if (G_global_args_malloced) {
Denys Vlasenko61508d92016-10-02 21:12:02 +02009862 int m = 1;
9863 while (m <= n)
9864 free(G.global_argv[m++]);
9865 }
9866 G.global_argc -= n;
9867 memmove(&G.global_argv[1], &G.global_argv[n+1],
9868 G.global_argc * sizeof(G.global_argv[0]));
9869 return EXIT_SUCCESS;
9870 }
9871 return EXIT_FAILURE;
9872}
9873
Denys Vlasenko74d40582017-08-11 01:32:46 +02009874#if ENABLE_HUSH_GETOPTS
9875static int FAST_FUNC builtin_getopts(char **argv)
9876{
Denys Vlasenko9a7d0a02017-08-11 02:37:48 +02009877/* http://pubs.opengroup.org/onlinepubs/9699919799/utilities/getopts.html
9878
Denys Vlasenko74d40582017-08-11 01:32:46 +02009879TODO:
Denys Vlasenko74d40582017-08-11 01:32:46 +02009880If a required argument is not found, and getopts is not silent,
9881a question mark (?) is placed in VAR, OPTARG is unset, and a
9882diagnostic message is printed. If getopts is silent, then a
9883colon (:) is placed in VAR and OPTARG is set to the option
9884character found.
9885
9886Test that VAR is a valid variable name?
Denys Vlasenko9a7d0a02017-08-11 02:37:48 +02009887
9888"Whenever the shell is invoked, OPTIND shall be initialized to 1"
Denys Vlasenko74d40582017-08-11 01:32:46 +02009889*/
9890 char cbuf[2];
9891 const char *cp, *optstring, *var;
9892 int c, exitcode;
9893
9894 optstring = *++argv;
9895 if (!optstring || !(var = *++argv)) {
9896 bb_error_msg("usage: getopts OPTSTRING VAR [ARGS]");
9897 return EXIT_FAILURE;
9898 }
9899
Denys Vlasenko419db032017-08-11 17:21:14 +02009900 if (optstring[0] == ':') {
9901 opterr = 0;
9902 } else {
9903 cp = get_local_var_value("OPTERR");
9904 opterr = cp ? atoi(cp) : 1;
9905 }
Denys Vlasenko74d40582017-08-11 01:32:46 +02009906 cp = get_local_var_value("OPTIND");
9907 optind = cp ? atoi(cp) : 0;
Denys Vlasenko81f962f2017-08-11 02:05:21 +02009908 optarg = NULL;
Denys Vlasenko419db032017-08-11 17:21:14 +02009909 cbuf[1] = '\0';
Denys Vlasenko74d40582017-08-11 01:32:46 +02009910
9911 /* getopts stops on first non-option. Add "+" to force that */
9912 /*if (optstring[0] != '+')*/ {
9913 char *s = alloca(strlen(optstring) + 2);
9914 sprintf(s, "+%s", optstring);
9915 optstring = s;
9916 }
9917
9918 if (argv[1])
9919 argv[0] = G.global_argv[0]; /* for error messages */
9920 else
9921 argv = G.global_argv;
9922 c = getopt(string_array_len(argv), argv, optstring);
Denys Vlasenko419db032017-08-11 17:21:14 +02009923
9924 /* Set OPTARG */
9925 /* Always set or unset, never left as-is, even on exit/error:
9926 * "If no option was found, or if the option that was found
9927 * does not have an option-argument, OPTARG shall be unset."
9928 */
9929 cp = optarg;
9930 if (c == '?') {
9931 /* If ":optstring" and unknown option is seen,
9932 * it is stored to OPTARG.
9933 */
9934 if (optstring[1] == ':') {
9935 cbuf[0] = optopt;
9936 cp = cbuf;
9937 }
9938 }
9939 if (cp)
9940 set_local_var_from_halves("OPTARG", cp);
9941 else
9942 unset_local_var("OPTARG");
9943
9944 /* Convert -1 to "?" */
Denys Vlasenko74d40582017-08-11 01:32:46 +02009945 exitcode = EXIT_SUCCESS;
9946 if (c < 0) { /* -1: end of options */
9947 exitcode = EXIT_FAILURE;
9948 c = '?';
9949 }
Denys Vlasenko419db032017-08-11 17:21:14 +02009950
9951 /* Set OPTIND */
Denys Vlasenko74d40582017-08-11 01:32:46 +02009952 cbuf[0] = c;
Denys Vlasenko74d40582017-08-11 01:32:46 +02009953 set_local_var_from_halves(var, cbuf);
9954 set_local_var_from_halves("OPTIND", utoa(optind));
Denys Vlasenko9a7d0a02017-08-11 02:37:48 +02009955
Denys Vlasenko74d40582017-08-11 01:32:46 +02009956 return exitcode;
9957}
9958#endif
9959
Denys Vlasenkoa1184af2017-01-10 15:58:02 +01009960static int FAST_FUNC builtin_source(char **argv)
Denys Vlasenko61508d92016-10-02 21:12:02 +02009961{
Denys Vlasenkoa1184af2017-01-10 15:58:02 +01009962 char *arg_path, *filename;
9963 FILE *input;
9964 save_arg_t sv;
9965 char *args_need_save;
9966#if ENABLE_HUSH_FUNCTIONS
9967 smallint sv_flg;
Denys Vlasenko7a85c602017-01-08 17:40:18 +01009968#endif
Denys Vlasenko61508d92016-10-02 21:12:02 +02009969
Denys Vlasenkoa1184af2017-01-10 15:58:02 +01009970 argv = skip_dash_dash(argv);
9971 filename = argv[0];
9972 if (!filename) {
9973 /* bash says: "bash: .: filename argument required" */
9974 return 2; /* bash compat */
9975 }
9976 arg_path = NULL;
9977 if (!strchr(filename, '/')) {
9978 arg_path = find_in_path(filename);
9979 if (arg_path)
9980 filename = arg_path;
9981 }
9982 input = remember_FILE(fopen_or_warn(filename, "r"));
9983 free(arg_path);
9984 if (!input) {
9985 /* bb_perror_msg("%s", *argv); - done by fopen_or_warn */
9986 /* POSIX: non-interactive shell should abort here,
9987 * not merely fail. So far no one complained :)
9988 */
9989 return EXIT_FAILURE;
9990 }
9991
9992#if ENABLE_HUSH_FUNCTIONS
9993 sv_flg = G_flag_return_in_progress;
9994 /* "we are inside sourced file, ok to use return" */
9995 G_flag_return_in_progress = -1;
9996#endif
9997 args_need_save = argv[1]; /* used as a boolean variable */
9998 if (args_need_save)
9999 save_and_replace_G_args(&sv, argv);
10000
10001 /* "false; . ./empty_line; echo Zero:$?" should print 0 */
10002 G.last_exitcode = 0;
10003 parse_and_run_file(input);
10004 fclose_and_forget(input);
10005
10006 if (args_need_save) /* can't use argv[1] instead: "shift" can mangle it */
10007 restore_G_args(&sv, argv);
10008#if ENABLE_HUSH_FUNCTIONS
10009 G_flag_return_in_progress = sv_flg;
10010#endif
10011
10012 return G.last_exitcode;
10013}
10014
Denys Vlasenko7a85c602017-01-08 17:40:18 +010010015#if ENABLE_HUSH_TRAP
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +020010016static int FAST_FUNC builtin_trap(char **argv)
Denis Vlasenko38e626d2009-04-18 12:58:19 +000010017{
Denis Vlasenko38e626d2009-04-18 12:58:19 +000010018 int sig;
10019 char *new_cmd;
10020
Denys Vlasenko7a85c602017-01-08 17:40:18 +010010021 if (!G_traps)
10022 G_traps = xzalloc(sizeof(G_traps[0]) * NSIG);
Denis Vlasenko38e626d2009-04-18 12:58:19 +000010023
10024 argv++;
10025 if (!*argv) {
Denis Vlasenko6008d8a2009-04-18 13:05:10 +000010026 int i;
Denis Vlasenko38e626d2009-04-18 12:58:19 +000010027 /* No args: print all trapped */
10028 for (i = 0; i < NSIG; ++i) {
Denys Vlasenko7a85c602017-01-08 17:40:18 +010010029 if (G_traps[i]) {
Denis Vlasenko38e626d2009-04-18 12:58:19 +000010030 printf("trap -- ");
Denys Vlasenko7a85c602017-01-08 17:40:18 +010010031 print_escaped(G_traps[i]);
Denys Vlasenkoe74aaf92009-09-27 02:05:45 +020010032 /* note: bash adds "SIG", but only if invoked
10033 * as "bash". If called as "sh", or if set -o posix,
10034 * then it prints short signal names.
10035 * We are printing short names: */
10036 printf(" %s\n", get_signame(i));
Denis Vlasenko38e626d2009-04-18 12:58:19 +000010037 }
10038 }
Denys Vlasenko8131eea2009-11-02 14:19:51 +010010039 /*fflush_all(); - done after each builtin anyway */
Denis Vlasenko38e626d2009-04-18 12:58:19 +000010040 return EXIT_SUCCESS;
10041 }
10042
10043 new_cmd = NULL;
Denis Vlasenko38e626d2009-04-18 12:58:19 +000010044 /* If first arg is a number: reset all specified signals */
10045 sig = bb_strtou(*argv, NULL, 10);
10046 if (errno == 0) {
10047 int ret;
10048 process_sig_list:
10049 ret = EXIT_SUCCESS;
10050 while (*argv) {
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +020010051 sighandler_t handler;
10052
Denis Vlasenko38e626d2009-04-18 12:58:19 +000010053 sig = get_signum(*argv++);
Denys Vlasenko86981e32017-07-25 20:06:17 +020010054 if (sig < 0) {
Denis Vlasenko38e626d2009-04-18 12:58:19 +000010055 ret = EXIT_FAILURE;
10056 /* Mimic bash message exactly */
Denys Vlasenko74562982017-07-06 18:40:45 +020010057 bb_error_msg("trap: %s: invalid signal specification", argv[-1]);
Denis Vlasenko38e626d2009-04-18 12:58:19 +000010058 continue;
10059 }
10060
Denys Vlasenko7a85c602017-01-08 17:40:18 +010010061 free(G_traps[sig]);
10062 G_traps[sig] = xstrdup(new_cmd);
Denis Vlasenko38e626d2009-04-18 12:58:19 +000010063
Denys Vlasenkoe89a2412010-01-12 15:19:31 +010010064 debug_printf("trap: setting SIG%s (%i) to '%s'\n",
Denys Vlasenko7a85c602017-01-08 17:40:18 +010010065 get_signame(sig), sig, G_traps[sig]);
Denis Vlasenko38e626d2009-04-18 12:58:19 +000010066
10067 /* There is no signal for 0 (EXIT) */
10068 if (sig == 0)
10069 continue;
10070
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +020010071 if (new_cmd)
10072 handler = (new_cmd[0] ? record_pending_signo : SIG_IGN);
10073 else
10074 /* We are removing trap handler */
10075 handler = pick_sighandler(sig);
Denys Vlasenko0806e402011-05-12 23:06:20 +020010076 install_sighandler(sig, handler);
Denis Vlasenko38e626d2009-04-18 12:58:19 +000010077 }
10078 return ret;
10079 }
10080
10081 if (!argv[1]) { /* no second arg */
10082 bb_error_msg("trap: invalid arguments");
10083 return EXIT_FAILURE;
10084 }
10085
10086 /* First arg is "-": reset all specified to default */
10087 /* First arg is "--": skip it, the rest is "handler SIGs..." */
10088 /* Everything else: set arg as signal handler
10089 * (includes "" case, which ignores signal) */
10090 if (argv[0][0] == '-') {
10091 if (argv[0][1] == '\0') { /* "-" */
10092 /* new_cmd remains NULL: "reset these sigs" */
10093 goto reset_traps;
10094 }
10095 if (argv[0][1] == '-' && argv[0][2] == '\0') { /* "--" */
10096 argv++;
10097 }
10098 /* else: "-something", no special meaning */
10099 }
10100 new_cmd = *argv;
10101 reset_traps:
10102 argv++;
10103 goto process_sig_list;
10104}
Denys Vlasenko7a85c602017-01-08 17:40:18 +010010105#endif
Denis Vlasenko38e626d2009-04-18 12:58:19 +000010106
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010107#if ENABLE_HUSH_JOB
Denys Vlasenko4e1c8b42016-11-07 20:06:40 +010010108static struct pipe *parse_jobspec(const char *str)
10109{
10110 struct pipe *pi;
Denys Vlasenkod5b5c2f2017-01-08 15:46:04 +010010111 unsigned jobnum;
Denys Vlasenko4e1c8b42016-11-07 20:06:40 +010010112
Denys Vlasenkod5b5c2f2017-01-08 15:46:04 +010010113 if (sscanf(str, "%%%u", &jobnum) != 1) {
10114 if (str[0] != '%'
10115 || (str[1] != '%' && str[1] != '+' && str[1] != '\0')
10116 ) {
10117 bb_error_msg("bad argument '%s'", str);
10118 return NULL;
10119 }
10120 /* It is "%%", "%+" or "%" - current job */
10121 jobnum = G.last_jobid;
10122 if (jobnum == 0) {
10123 bb_error_msg("no current job");
10124 return NULL;
10125 }
Denys Vlasenko4e1c8b42016-11-07 20:06:40 +010010126 }
10127 for (pi = G.job_list; pi; pi = pi->next) {
10128 if (pi->jobid == jobnum) {
10129 return pi;
10130 }
10131 }
Denys Vlasenkofd68f1e2017-01-09 05:47:57 +010010132 bb_error_msg("%u: no such job", jobnum);
Denys Vlasenko4e1c8b42016-11-07 20:06:40 +010010133 return NULL;
10134}
10135
Denys Vlasenkoa1184af2017-01-10 15:58:02 +010010136static int FAST_FUNC builtin_jobs(char **argv UNUSED_PARAM)
10137{
10138 struct pipe *job;
10139 const char *status_string;
10140
10141 checkjobs(NULL, 0 /*(no pid to wait for)*/);
10142 for (job = G.job_list; job; job = job->next) {
10143 if (job->alive_cmds == job->stopped_cmds)
10144 status_string = "Stopped";
10145 else
10146 status_string = "Running";
10147
10148 printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->cmdtext);
10149 }
Denys Vlasenko2ed74e22017-07-14 19:58:46 +020010150
10151 clean_up_last_dead_job();
10152
Denys Vlasenkoa1184af2017-01-10 15:58:02 +010010153 return EXIT_SUCCESS;
10154}
10155
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010156/* built-in 'fg' and 'bg' handler */
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +020010157static int FAST_FUNC builtin_fg_bg(char **argv)
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010158{
Denys Vlasenko4e1c8b42016-11-07 20:06:40 +010010159 int i;
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010160 struct pipe *pi;
10161
Denis Vlasenko60b392f2009-04-03 19:14:32 +000010162 if (!G_interactive_fd)
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010163 return EXIT_FAILURE;
Denis Vlasenkoc8653f62009-04-27 23:29:14 +000010164
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010165 /* If they gave us no args, assume they want the last backgrounded task */
10166 if (!argv[1]) {
Denis Vlasenko87a86552008-07-29 19:43:10 +000010167 for (pi = G.job_list; pi; pi = pi->next) {
10168 if (pi->jobid == G.last_jobid) {
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010169 goto found;
10170 }
10171 }
10172 bb_error_msg("%s: no current job", argv[0]);
10173 return EXIT_FAILURE;
10174 }
Denys Vlasenko4e1c8b42016-11-07 20:06:40 +010010175
10176 pi = parse_jobspec(argv[1]);
10177 if (!pi)
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010178 return EXIT_FAILURE;
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010179 found:
Denis Vlasenko6b9e0532009-04-18 01:23:21 +000010180 /* TODO: bash prints a string representation
10181 * of job being foregrounded (like "sleep 1 | cat") */
Mike Frysinger38478a62009-05-20 04:48:06 -040010182 if (argv[0][0] == 'f' && G_saved_tty_pgrp) {
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010183 /* Put the job into the foreground. */
Denis Vlasenko60b392f2009-04-03 19:14:32 +000010184 tcsetpgrp(G_interactive_fd, pi->pgrp);
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010185 }
10186
10187 /* Restart the processes in the job */
Denis Vlasenko9af22c72008-10-09 12:54:58 +000010188 debug_printf_jobs("reviving %d procs, pgrp %d\n", pi->num_cmds, pi->pgrp);
10189 for (i = 0; i < pi->num_cmds; i++) {
10190 debug_printf_jobs("reviving pid %d\n", pi->cmds[i].pid);
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010191 }
Denis Vlasenko9af22c72008-10-09 12:54:58 +000010192 pi->stopped_cmds = 0;
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010193
10194 i = kill(- pi->pgrp, SIGCONT);
10195 if (i < 0) {
10196 if (errno == ESRCH) {
Denys Vlasenko16096292017-07-10 10:00:28 +020010197 delete_finished_job(pi);
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010198 return EXIT_SUCCESS;
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010199 }
Denis Vlasenko34d4d892009-04-04 20:24:37 +000010200 bb_perror_msg("kill (SIGCONT)");
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010201 }
10202
Denis Vlasenko34d4d892009-04-04 20:24:37 +000010203 if (argv[0][0] == 'f') {
Denys Vlasenko16096292017-07-10 10:00:28 +020010204 remove_job_from_table(pi); /* FG job shouldn't be in job table */
Denis Vlasenkoc7985b72008-06-17 05:43:38 +000010205 return checkjobs_and_fg_shell(pi);
10206 }
10207 return EXIT_SUCCESS;
10208}
10209#endif
10210
Denys Vlasenko1125d7d2017-01-08 17:19:38 +010010211#if ENABLE_HUSH_KILL
10212static int FAST_FUNC builtin_kill(char **argv)
10213{
10214 int ret = 0;
10215
Denys Vlasenkofd68f1e2017-01-09 05:47:57 +010010216# if ENABLE_HUSH_JOB
10217 if (argv[1] && strcmp(argv[1], "-l") != 0) {
10218 int i = 1;
Denys Vlasenko1125d7d2017-01-08 17:19:38 +010010219
10220 do {
10221 struct pipe *pi;
10222 char *dst;
10223 int j, n;
10224
10225 if (argv[i][0] != '%')
10226 continue;
10227 /*
10228 * "kill %N" - job kill
10229 * Converting to pgrp / pid kill
10230 */
10231 pi = parse_jobspec(argv[i]);
10232 if (!pi) {
10233 /* Eat bad jobspec */
10234 j = i;
10235 do {
10236 j++;
10237 argv[j - 1] = argv[j];
10238 } while (argv[j]);
10239 ret = 1;
10240 i--;
10241 continue;
10242 }
10243 /*
10244 * In jobs started under job control, we signal
10245 * entire process group by kill -PGRP_ID.
10246 * This happens, f.e., in interactive shell.
10247 *
10248 * Otherwise, we signal each child via
10249 * kill PID1 PID2 PID3.
10250 * Testcases:
10251 * sh -c 'sleep 1|sleep 1 & kill %1'
10252 * sh -c 'true|sleep 2 & sleep 1; kill %1'
10253 * sh -c 'true|sleep 1 & sleep 2; kill %1'
10254 */
Denys Vlasenko5362cc42017-01-09 05:57:13 +010010255 n = G_interactive_fd ? 1 : pi->num_cmds;
Denys Vlasenko1125d7d2017-01-08 17:19:38 +010010256 dst = alloca(n * sizeof(int)*4);
10257 argv[i] = dst;
Denys Vlasenko1125d7d2017-01-08 17:19:38 +010010258 if (G_interactive_fd)
10259 dst += sprintf(dst, " -%u", (int)pi->pgrp);
Denys Vlasenkofd68f1e2017-01-09 05:47:57 +010010260 else for (j = 0; j < n; j++) {
Denys Vlasenko1125d7d2017-01-08 17:19:38 +010010261 struct command *cmd = &pi->cmds[j];
10262 /* Skip exited members of the job */
10263 if (cmd->pid == 0)
10264 continue;
10265 /*
10266 * kill_main has matching code to expect
10267 * leading space. Needed to not confuse
10268 * negative pids with "kill -SIGNAL_NO" syntax
10269 */
10270 dst += sprintf(dst, " %u", (int)cmd->pid);
10271 }
10272 *dst = '\0';
10273 } while (argv[++i]);
10274 }
Denys Vlasenkofd68f1e2017-01-09 05:47:57 +010010275# endif
Denys Vlasenko1125d7d2017-01-08 17:19:38 +010010276
Denys Vlasenkofd68f1e2017-01-09 05:47:57 +010010277 if (argv[1] || ret == 0) {
Denys Vlasenko1125d7d2017-01-08 17:19:38 +010010278 ret = run_applet_main(argv, kill_main);
10279 }
Denys Vlasenkofd68f1e2017-01-09 05:47:57 +010010280 /* else: ret = 1, "kill %bad_jobspec" case */
Denys Vlasenko1125d7d2017-01-08 17:19:38 +010010281 return ret;
10282}
10283#endif
10284
10285#if ENABLE_HUSH_WAIT
Mike Frysinger56bdea12009-03-28 20:01:58 +000010286/* http://www.opengroup.org/onlinepubs/9699919799/utilities/wait.html */
Denys Vlasenko62b717b2016-11-07 22:12:18 +010010287#if !ENABLE_HUSH_JOB
10288# define wait_for_child_or_signal(pipe,pid) wait_for_child_or_signal(pid)
10289#endif
10290static int wait_for_child_or_signal(struct pipe *waitfor_pipe, pid_t waitfor_pid)
Denys Vlasenko7e675362016-10-28 21:57:31 +020010291{
10292 int ret = 0;
10293 for (;;) {
10294 int sig;
Denys Vlasenko62b717b2016-11-07 22:12:18 +010010295 sigset_t oldset;
Denys Vlasenko7e675362016-10-28 21:57:31 +020010296
Denys Vlasenko830ea352016-11-08 04:59:11 +010010297 if (!sigisemptyset(&G.pending_set))
10298 goto check_sig;
10299
Denys Vlasenko7e675362016-10-28 21:57:31 +020010300 /* waitpid is not interruptible by SA_RESTARTed
10301 * signals which we use. Thus, this ugly dance:
10302 */
10303
10304 /* Make sure possible SIGCHLD is stored in kernel's
10305 * pending signal mask before we call waitpid.
10306 * Or else we may race with SIGCHLD, lose it,
Denys Vlasenko62b717b2016-11-07 22:12:18 +010010307 * and get stuck in sigsuspend...
Denys Vlasenko7e675362016-10-28 21:57:31 +020010308 */
Denys Vlasenko62b717b2016-11-07 22:12:18 +010010309 sigfillset(&oldset); /* block all signals, remember old set */
10310 sigprocmask(SIG_SETMASK, &oldset, &oldset);
Denys Vlasenko7e675362016-10-28 21:57:31 +020010311
10312 if (!sigisemptyset(&G.pending_set)) {
10313 /* Crap! we raced with some signal! */
Denys Vlasenko7e675362016-10-28 21:57:31 +020010314 goto restore;
10315 }
10316
10317 /*errno = 0; - checkjobs does this */
Denys Vlasenko62b717b2016-11-07 22:12:18 +010010318/* Can't pass waitfor_pipe into checkjobs(): it won't be interruptible */
Denys Vlasenko7e675362016-10-28 21:57:31 +020010319 ret = checkjobs(NULL, waitfor_pid); /* waitpid(WNOHANG) inside */
Denys Vlasenko62b717b2016-11-07 22:12:18 +010010320 debug_printf_exec("checkjobs:%d\n", ret);
10321#if ENABLE_HUSH_JOB
10322 if (waitfor_pipe) {
10323 int rcode = job_exited_or_stopped(waitfor_pipe);
10324 debug_printf_exec("job_exited_or_stopped:%d\n", rcode);
10325 if (rcode >= 0) {
10326 ret = rcode;
10327 sigprocmask(SIG_SETMASK, &oldset, NULL);
10328 break;
10329 }
10330 }
10331#endif
Denys Vlasenko7e675362016-10-28 21:57:31 +020010332 /* if ECHILD, there are no children (ret is -1 or 0) */
10333 /* if ret == 0, no children changed state */
10334 /* if ret != 0, it's exitcode+1 of exited waitfor_pid child */
Denys Vlasenko62b717b2016-11-07 22:12:18 +010010335 if (errno == ECHILD || ret) {
10336 ret--;
10337 if (ret < 0) /* if ECHILD, may need to fix "ret" */
Denys Vlasenko7e675362016-10-28 21:57:31 +020010338 ret = 0;
10339 sigprocmask(SIG_SETMASK, &oldset, NULL);
10340 break;
10341 }
Denys Vlasenko7e675362016-10-28 21:57:31 +020010342 /* Wait for SIGCHLD or any other signal */
Denys Vlasenko7e675362016-10-28 21:57:31 +020010343 /* It is vitally important for sigsuspend that SIGCHLD has non-DFL handler! */
10344 /* Note: sigsuspend invokes signal handler */
10345 sigsuspend(&oldset);
10346 restore:
10347 sigprocmask(SIG_SETMASK, &oldset, NULL);
Denys Vlasenko830ea352016-11-08 04:59:11 +010010348 check_sig:
Denys Vlasenko7e675362016-10-28 21:57:31 +020010349 /* So, did we get a signal? */
Denys Vlasenko7e675362016-10-28 21:57:31 +020010350 sig = check_and_run_traps();
10351 if (sig /*&& sig != SIGCHLD - always true */) {
Denys Vlasenko7c40ddd2017-08-02 16:37:39 +020010352 /* Do this for any (non-ignored) signal, not only for ^C */
Denys Vlasenko7e675362016-10-28 21:57:31 +020010353 ret = 128 + sig;
10354 break;
10355 }
10356 /* SIGCHLD, or no signal, or ignored one, such as SIGQUIT. Repeat */
10357 }
10358 return ret;
10359}
10360
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +020010361static int FAST_FUNC builtin_wait(char **argv)
Mike Frysinger56bdea12009-03-28 20:01:58 +000010362{
Denys Vlasenko7e675362016-10-28 21:57:31 +020010363 int ret;
Denys Vlasenko9d6cbaf2011-05-11 23:56:11 +020010364 int status;
Mike Frysinger56bdea12009-03-28 20:01:58 +000010365
Denys Vlasenkob131cce2010-05-20 03:39:43 +020010366 argv = skip_dash_dash(argv);
10367 if (argv[0] == NULL) {
Denis Vlasenko7566bae2009-03-31 17:24:49 +000010368 /* Don't care about wait results */
10369 /* Note 1: must wait until there are no more children */
10370 /* Note 2: must be interruptible */
10371 /* Examples:
10372 * $ sleep 3 & sleep 6 & wait
10373 * [1] 30934 sleep 3
10374 * [2] 30935 sleep 6
10375 * [1] Done sleep 3
10376 * [2] Done sleep 6
10377 * $ sleep 3 & sleep 6 & wait
10378 * [1] 30936 sleep 3
10379 * [2] 30937 sleep 6
10380 * [1] Done sleep 3
10381 * ^C <-- after ~4 sec from keyboard
10382 * $
10383 */
Denys Vlasenko62b717b2016-11-07 22:12:18 +010010384 return wait_for_child_or_signal(NULL, 0 /*(no job and no pid to wait for)*/);
Denis Vlasenko7566bae2009-03-31 17:24:49 +000010385 }
Mike Frysinger56bdea12009-03-28 20:01:58 +000010386
Denys Vlasenko7e675362016-10-28 21:57:31 +020010387 do {
Denis Vlasenkod5762932009-03-31 11:22:57 +000010388 pid_t pid = bb_strtou(*argv, NULL, 10);
Denys Vlasenko7e675362016-10-28 21:57:31 +020010389 if (errno || pid <= 0) {
Denys Vlasenko62b717b2016-11-07 22:12:18 +010010390#if ENABLE_HUSH_JOB
10391 if (argv[0][0] == '%') {
Denys Vlasenko02affb42016-11-08 00:59:29 +010010392 struct pipe *wait_pipe;
Denys Vlasenkod5b5c2f2017-01-08 15:46:04 +010010393 ret = 127; /* bash compat for bad jobspecs */
Denys Vlasenko62b717b2016-11-07 22:12:18 +010010394 wait_pipe = parse_jobspec(*argv);
10395 if (wait_pipe) {
Denys Vlasenko02affb42016-11-08 00:59:29 +010010396 ret = job_exited_or_stopped(wait_pipe);
Denys Vlasenko2ed74e22017-07-14 19:58:46 +020010397 if (ret < 0) {
Denys Vlasenko02affb42016-11-08 00:59:29 +010010398 ret = wait_for_child_or_signal(wait_pipe, 0);
Denys Vlasenko2ed74e22017-07-14 19:58:46 +020010399 } else {
10400 /* waiting on "last dead job" removes it */
10401 clean_up_last_dead_job();
Denys Vlasenko13102632017-07-08 00:24:32 +020010402 }
Denys Vlasenko62b717b2016-11-07 22:12:18 +010010403 }
Denys Vlasenkod5b5c2f2017-01-08 15:46:04 +010010404 /* else: parse_jobspec() already emitted error msg */
10405 continue;
Denys Vlasenko62b717b2016-11-07 22:12:18 +010010406 }
10407#endif
Denis Vlasenkod5762932009-03-31 11:22:57 +000010408 /* mimic bash message */
10409 bb_error_msg("wait: '%s': not a pid or valid job spec", *argv);
Denys Vlasenko9db74e42016-10-28 22:39:12 +020010410 ret = EXIT_FAILURE;
10411 continue; /* bash checks all argv[] */
Denis Vlasenkod5762932009-03-31 11:22:57 +000010412 }
Denys Vlasenko02affb42016-11-08 00:59:29 +010010413
Denys Vlasenko7e675362016-10-28 21:57:31 +020010414 /* Do we have such child? */
10415 ret = waitpid(pid, &status, WNOHANG);
10416 if (ret < 0) {
10417 /* No */
Denys Vlasenko840a4352017-07-07 22:56:02 +020010418 ret = 127;
Denys Vlasenko7e675362016-10-28 21:57:31 +020010419 if (errno == ECHILD) {
Denys Vlasenko0c5657e2017-07-14 19:27:03 +020010420 if (pid == G.last_bg_pid) {
Denys Vlasenko9db74e42016-10-28 22:39:12 +020010421 /* "wait $!" but last bg task has already exited. Try:
10422 * (sleep 1; exit 3) & sleep 2; echo $?; wait $!; echo $?
10423 * In bash it prints exitcode 0, then 3.
Denys Vlasenko26ad94b2016-11-07 23:07:21 +010010424 * In dash, it is 127.
Denys Vlasenko9db74e42016-10-28 22:39:12 +020010425 */
Denys Vlasenko840a4352017-07-07 22:56:02 +020010426 ret = G.last_bg_pid_exitcode;
Denys Vlasenko26ad94b2016-11-07 23:07:21 +010010427 } else {
10428 /* Example: "wait 1". mimic bash message */
10429 bb_error_msg("wait: pid %d is not a child of this shell", (int)pid);
Denys Vlasenko9db74e42016-10-28 22:39:12 +020010430 }
Denys Vlasenko7e675362016-10-28 21:57:31 +020010431 } else {
10432 /* ??? */
10433 bb_perror_msg("wait %s", *argv);
10434 }
Denys Vlasenko9db74e42016-10-28 22:39:12 +020010435 continue; /* bash checks all argv[] */
10436 }
10437 if (ret == 0) {
Denys Vlasenko7e675362016-10-28 21:57:31 +020010438 /* Yes, and it still runs */
Denys Vlasenko02affb42016-11-08 00:59:29 +010010439 ret = wait_for_child_or_signal(NULL, pid);
Denys Vlasenko7e675362016-10-28 21:57:31 +020010440 } else {
10441 /* Yes, and it just exited */
Denys Vlasenko02affb42016-11-08 00:59:29 +010010442 process_wait_result(NULL, pid, status);
Denys Vlasenko85378cd2015-10-11 21:47:11 +020010443 ret = WEXITSTATUS(status);
Mike Frysinger56bdea12009-03-28 20:01:58 +000010444 if (WIFSIGNALED(status))
10445 ret = 128 + WTERMSIG(status);
Mike Frysinger56bdea12009-03-28 20:01:58 +000010446 }
Denys Vlasenko9db74e42016-10-28 22:39:12 +020010447 } while (*++argv);
Mike Frysinger56bdea12009-03-28 20:01:58 +000010448
10449 return ret;
10450}
Denys Vlasenko1125d7d2017-01-08 17:19:38 +010010451#endif
Mike Frysinger56bdea12009-03-28 20:01:58 +000010452
Denis Vlasenko3d40d8e2009-04-17 23:44:18 +000010453#if ENABLE_HUSH_LOOPS || ENABLE_HUSH_FUNCTIONS
10454static unsigned parse_numeric_argv1(char **argv, unsigned def, unsigned def_min)
10455{
10456 if (argv[1]) {
10457 def = bb_strtou(argv[1], NULL, 10);
10458 if (errno || def < def_min || argv[2]) {
10459 bb_error_msg("%s: bad arguments", argv[0]);
10460 def = UINT_MAX;
10461 }
10462 }
10463 return def;
10464}
10465#endif
10466
Denis Vlasenkodadfb492008-07-29 10:16:05 +000010467#if ENABLE_HUSH_LOOPS
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +020010468static int FAST_FUNC builtin_break(char **argv)
Denis Vlasenkobcb25532008-07-28 23:04:34 +000010469{
Denis Vlasenko3d40d8e2009-04-17 23:44:18 +000010470 unsigned depth;
Denis Vlasenko87a86552008-07-29 19:43:10 +000010471 if (G.depth_of_loop == 0) {
Denis Vlasenko4f504a92008-07-29 19:48:30 +000010472 bb_error_msg("%s: only meaningful in a loop", argv[0]);
Denys Vlasenko49117b42016-07-21 14:40:08 +020010473 /* if we came from builtin_continue(), need to undo "= 1" */
10474 G.flag_break_continue = 0;
Denis Vlasenkofcf37c32008-07-29 11:37:15 +000010475 return EXIT_SUCCESS; /* bash compat */
10476 }
Denys Vlasenko49117b42016-07-21 14:40:08 +020010477 G.flag_break_continue++; /* BC_BREAK = 1, or BC_CONTINUE = 2 */
Denis Vlasenko3d40d8e2009-04-17 23:44:18 +000010478
10479 G.depth_break_continue = depth = parse_numeric_argv1(argv, 1, 1);
10480 if (depth == UINT_MAX)
10481 G.flag_break_continue = BC_BREAK;
10482 if (G.depth_of_loop < depth)
Denis Vlasenko87a86552008-07-29 19:43:10 +000010483 G.depth_break_continue = G.depth_of_loop;
Denis Vlasenko3d40d8e2009-04-17 23:44:18 +000010484
Denis Vlasenkobcb25532008-07-28 23:04:34 +000010485 return EXIT_SUCCESS;
10486}
10487
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +020010488static int FAST_FUNC builtin_continue(char **argv)
Denis Vlasenkobcb25532008-07-28 23:04:34 +000010489{
Denis Vlasenko4f504a92008-07-29 19:48:30 +000010490 G.flag_break_continue = 1; /* BC_CONTINUE = 2 = 1+1 */
10491 return builtin_break(argv);
Denis Vlasenkobcb25532008-07-28 23:04:34 +000010492}
Denis Vlasenkodadfb492008-07-29 10:16:05 +000010493#endif
Denis Vlasenko3d40d8e2009-04-17 23:44:18 +000010494
10495#if ENABLE_HUSH_FUNCTIONS
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +020010496static int FAST_FUNC builtin_return(char **argv)
Denis Vlasenko3d40d8e2009-04-17 23:44:18 +000010497{
10498 int rc;
10499
Denys Vlasenko04b46bc2016-10-01 22:28:03 +020010500 if (G_flag_return_in_progress != -1) {
Denis Vlasenko3d40d8e2009-04-17 23:44:18 +000010501 bb_error_msg("%s: not in a function or sourced script", argv[0]);
10502 return EXIT_FAILURE; /* bash compat */
10503 }
10504
Denys Vlasenko04b46bc2016-10-01 22:28:03 +020010505 G_flag_return_in_progress = 1;
Denis Vlasenko3d40d8e2009-04-17 23:44:18 +000010506
10507 /* bash:
10508 * out of range: wraps around at 256, does not error out
10509 * non-numeric param:
10510 * f() { false; return qwe; }; f; echo $?
10511 * bash: return: qwe: numeric argument required <== we do this
10512 * 255 <== we also do this
10513 */
10514 rc = parse_numeric_argv1(argv, G.last_exitcode, 0);
10515 return rc;
10516}
10517#endif
Denys Vlasenkoa1184af2017-01-10 15:58:02 +010010518
Denys Vlasenko11f2e992017-08-10 16:34:03 +020010519#if ENABLE_HUSH_TIMES
10520static int FAST_FUNC builtin_times(char **argv UNUSED_PARAM)
10521{
10522 static const uint8_t times_tbl[] ALIGN1 = {
10523 ' ', offsetof(struct tms, tms_utime),
10524 '\n', offsetof(struct tms, tms_stime),
10525 ' ', offsetof(struct tms, tms_cutime),
10526 '\n', offsetof(struct tms, tms_cstime),
10527 0
10528 };
10529 const uint8_t *p;
10530 unsigned clk_tck;
10531 struct tms buf;
10532
10533 clk_tck = bb_clk_tck();
10534
10535 times(&buf);
10536 p = times_tbl;
10537 do {
10538 unsigned sec, frac;
10539 unsigned long t;
10540 t = *(clock_t *)(((char *) &buf) + p[1]);
10541 sec = t / clk_tck;
10542 frac = t % clk_tck;
10543 printf("%um%u.%03us%c",
10544 sec / 60, sec % 60,
10545 (frac * 1000) / clk_tck,
10546 p[0]);
10547 p += 2;
10548 } while (*p);
10549
10550 return EXIT_SUCCESS;
10551}
10552#endif
10553
Denys Vlasenkoa1184af2017-01-10 15:58:02 +010010554#if ENABLE_HUSH_MEMLEAK
10555static int FAST_FUNC builtin_memleak(char **argv UNUSED_PARAM)
10556{
10557 void *p;
10558 unsigned long l;
10559
10560# ifdef M_TRIM_THRESHOLD
10561 /* Optional. Reduces probability of false positives */
10562 malloc_trim(0);
10563# endif
10564 /* Crude attempt to find where "free memory" starts,
10565 * sans fragmentation. */
10566 p = malloc(240);
10567 l = (unsigned long)p;
10568 free(p);
10569 p = malloc(3400);
10570 if (l < (unsigned long)p) l = (unsigned long)p;
10571 free(p);
10572
10573
10574# if 0 /* debug */
10575 {
10576 struct mallinfo mi = mallinfo();
10577 printf("top alloc:0x%lx malloced:%d+%d=%d\n", l,
10578 mi.arena, mi.hblkhd, mi.arena + mi.hblkhd);
10579 }
10580# endif
10581
10582 if (!G.memleak_value)
10583 G.memleak_value = l;
10584
10585 l -= G.memleak_value;
10586 if ((long)l < 0)
10587 l = 0;
10588 l /= 1024;
10589 if (l > 127)
10590 l = 127;
10591
10592 /* Exitcode is "how many kilobytes we leaked since 1st call" */
10593 return l;
10594}
10595#endif