blob: 2991edc096032ff55d225bf70eb996a63ad4b132 [file] [log] [blame]
"Robert P. J. Day"63fc1a92006-07-02 19:47:05 +00001/* vi: set sw=4 ts=4: */
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00002/* $Slackware: inetd.c 1.79s 2001/02/06 13:18:00 volkerdi Exp $ */
3/* $OpenBSD: inetd.c,v 1.79 2001/01/30 08:30:57 deraadt Exp $ */
4/* $NetBSD: inetd.c,v 1.11 1996/02/22 11:14:41 mycroft Exp $ */
5/* Busybox port by Vladimir Oleynik (C) 2001-2005 <dzo@simtreas.ru> */
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00006/* IPv6 support, many bug fixes by Denys Vlasenko (c) 2008 */
Glenn L McGrath06e95652003-02-09 06:51:14 +00007/*
8 * Copyright (c) 1983,1991 The Regents of the University of California.
9 * All rights reserved.
10 *
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +000011 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by the University of
22 * California, Berkeley and its contributors.
23 * 4. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
25 * without specific prior written permission.
Glenn L McGrath06e95652003-02-09 06:51:14 +000026 *
Denis Vlasenkof8138d12007-01-11 23:26:13 +000027 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS" AND
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +000028 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
Glenn L McGrath06e95652003-02-09 06:51:14 +000038 */
39
Denis Vlasenkof8138d12007-01-11 23:26:13 +000040/* Inetd - Internet super-server
Glenn L McGrath06e95652003-02-09 06:51:14 +000041 *
Denis Vlasenko4cf1d082008-03-12 23:13:50 +000042 * This program invokes configured services when a connection
43 * from a peer is established or a datagram arrives.
44 * Connection-oriented services are invoked each time a
Glenn L McGrath06e95652003-02-09 06:51:14 +000045 * connection is made, by creating a process. This process
46 * is passed the connection as file descriptor 0 and is
Denis Vlasenko4cf1d082008-03-12 23:13:50 +000047 * expected to do a getpeername to find out peer's host
Glenn L McGrath06e95652003-02-09 06:51:14 +000048 * and port.
Glenn L McGrath06e95652003-02-09 06:51:14 +000049 * Datagram oriented services are invoked when a datagram
50 * arrives; a process is created and passed a pending message
Denis Vlasenko4cf1d082008-03-12 23:13:50 +000051 * on file descriptor 0. peer's address can be obtained
52 * using recvfrom.
Glenn L McGrath06e95652003-02-09 06:51:14 +000053 *
54 * Inetd uses a configuration file which is read at startup
55 * and, possibly, at some later time in response to a hangup signal.
Denis Vlasenkof8138d12007-01-11 23:26:13 +000056 * The configuration file is "free format" with fields given in the
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +000057 * order shown below. Continuation lines for an entry must begin with
Glenn L McGrath06e95652003-02-09 06:51:14 +000058 * a space or tab. All fields must be present in each entry.
59 *
Denis Vlasenko4cf1d082008-03-12 23:13:50 +000060 * service_name must be in /etc/services
61 * socket_type stream/dgram/raw/rdm/seqpacket
Glenn L McGrath06e95652003-02-09 06:51:14 +000062 * protocol must be in /etc/protocols
Denis Vlasenko4e6d5112008-03-12 22:14:34 +000063 * (usually "tcp" or "udp")
Glenn L McGrath06e95652003-02-09 06:51:14 +000064 * wait/nowait[.max] single-threaded/multi-threaded, max #
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +000065 * user[.group] or user[:group] user/group to run daemon as
Denis Vlasenko4cf1d082008-03-12 23:13:50 +000066 * server_program full path name
67 * server_program_arguments maximum of MAXARGS (20)
Glenn L McGrath06e95652003-02-09 06:51:14 +000068 *
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +000069 * For RPC services
Denis Vlasenko4cf1d082008-03-12 23:13:50 +000070 * service_name/version must be in /etc/rpc
71 * socket_type stream/dgram/raw/rdm/seqpacket
Denis Vlasenko4e6d5112008-03-12 22:14:34 +000072 * rpc/protocol "rpc/tcp" etc
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +000073 * wait/nowait[.max] single-threaded/multi-threaded
74 * user[.group] or user[:group] user to run daemon as
Denis Vlasenko4cf1d082008-03-12 23:13:50 +000075 * server_program full path name
76 * server_program_arguments maximum of MAXARGS (20)
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +000077 *
78 * For non-RPC services, the "service name" can be of the form
79 * hostaddress:servicename, in which case the hostaddress is used
80 * as the host portion of the address to listen on. If hostaddress
Denis Vlasenko4cf1d082008-03-12 23:13:50 +000081 * consists of a single '*' character, INADDR_ANY is used.
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +000082 *
83 * A line can also consist of just
84 * hostaddress:
85 * where hostaddress is as in the preceding paragraph. Such a line must
86 * have no further fields; the specified hostaddress is remembered and
87 * used for all further lines that have no hostaddress specified,
88 * until the next such line (or EOF). (This is why * is provided to
89 * allow explicit specification of INADDR_ANY.) A line
90 * *:
91 * is implicitly in effect at the beginning of the file.
92 *
93 * The hostaddress specifier may (and often will) contain dots;
94 * the service name must not.
95 *
96 * For RPC services, host-address specifiers are accepted and will
97 * work to some extent; however, because of limitations in the
98 * portmapper interface, it will not work to try to give more than
99 * one line for any given RPC service, even if the host-address
100 * specifiers are different.
Glenn L McGrath06e95652003-02-09 06:51:14 +0000101 *
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000102 * Comment lines are indicated by a '#' in column 1.
Glenn L McGrath06e95652003-02-09 06:51:14 +0000103 */
104
Denis Vlasenkof8138d12007-01-11 23:26:13 +0000105/* inetd rules for passing file descriptors to children
106 * (http://www.freebsd.org/cgi/man.cgi?query=inetd):
107 *
108 * The wait/nowait entry specifies whether the server that is invoked by
109 * inetd will take over the socket associated with the service access point,
110 * and thus whether inetd should wait for the server to exit before listen-
111 * ing for new service requests. Datagram servers must use "wait", as
112 * they are always invoked with the original datagram socket bound to the
113 * specified service address. These servers must read at least one datagram
114 * from the socket before exiting. If a datagram server connects to its
115 * peer, freeing the socket so inetd can receive further messages on the
116 * socket, it is said to be a "multi-threaded" server; it should read one
117 * datagram from the socket and create a new socket connected to the peer.
118 * It should fork, and the parent should then exit to allow inetd to check
119 * for new service requests to spawn new servers. Datagram servers which
120 * process all incoming datagrams on a socket and eventually time out are
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000121 * said to be "single-threaded". The comsat(8), biff(1) and talkd(8)
Denis Vlasenkof8138d12007-01-11 23:26:13 +0000122 * utilities are both examples of the latter type of datagram server. The
123 * tftpd(8) utility is an example of a multi-threaded datagram server.
124 *
125 * Servers using stream sockets generally are multi-threaded and use the
126 * "nowait" entry. Connection requests for these services are accepted by
127 * inetd, and the server is given only the newly-accepted socket connected
128 * to a client of the service. Most stream-based services operate in this
129 * manner. Stream-based servers that use "wait" are started with the lis-
130 * tening service socket, and must accept at least one connection request
131 * before exiting. Such a server would normally accept and process incoming
132 * connection requests until a timeout.
Denis Vlasenkoaefed942008-03-17 08:35:44 +0000133 */
134
135/* Despite of above doc saying that dgram services must use "wait",
136 * "udp nowait" servers are implemented in busyboxed inetd.
137 * IPv6 addresses are also implemented. However, they may look ugly -
138 * ":::service..." means "address '::' (IPv6 wildcard addr)":"service"...
139 * You have to put "tcp6"/"udp6" in protocol field to select IPv6.
Denis Vlasenkof8138d12007-01-11 23:26:13 +0000140 */
141
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000142/* Here's the scoop concerning the user[:group] feature:
143 * 1) group is not specified:
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000144 * a) user = root: NO setuid() or setgid() is done
Denis Vlasenko92305822008-03-20 15:12:58 +0000145 * b) other: initgroups(name, primary group)
146 * setgid(primary group as found in passwd)
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000147 * setuid()
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000148 * 2) group is specified:
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000149 * a) user = root: setgid(specified group)
150 * NO initgroups()
151 * NO setuid()
Denis Vlasenko92305822008-03-20 15:12:58 +0000152 * b) other: initgroups(name, specified group)
153 * setgid(specified group)
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000154 * setuid()
Glenn L McGrath06e95652003-02-09 06:51:14 +0000155 */
Denys Vlasenko47367e12016-11-23 09:05:14 +0100156//config:config INETD
Denys Vlasenko4eed2c62017-07-18 22:01:24 +0200157//config: bool "inetd (18 kb)"
Denys Vlasenko47367e12016-11-23 09:05:14 +0100158//config: default y
159//config: select FEATURE_SYSLOG
160//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +0200161//config: Internet superserver daemon
Denys Vlasenko47367e12016-11-23 09:05:14 +0100162//config:
163//config:config FEATURE_INETD_SUPPORT_BUILTIN_ECHO
164//config: bool "Support echo service"
165//config: default y
166//config: depends on INETD
167//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +0200168//config: Echo received data internal inetd service
Denys Vlasenko47367e12016-11-23 09:05:14 +0100169//config:
170//config:config FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
171//config: bool "Support discard service"
172//config: default y
173//config: depends on INETD
174//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +0200175//config: Internet /dev/null internal inetd service
Denys Vlasenko47367e12016-11-23 09:05:14 +0100176//config:
177//config:config FEATURE_INETD_SUPPORT_BUILTIN_TIME
178//config: bool "Support time service"
179//config: default y
180//config: depends on INETD
181//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +0200182//config: Return 32 bit time since 1900 internal inetd service
Denys Vlasenko47367e12016-11-23 09:05:14 +0100183//config:
184//config:config FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
185//config: bool "Support daytime service"
186//config: default y
187//config: depends on INETD
188//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +0200189//config: Return human-readable time internal inetd service
Denys Vlasenko47367e12016-11-23 09:05:14 +0100190//config:
191//config:config FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
192//config: bool "Support chargen service"
193//config: default y
194//config: depends on INETD
195//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +0200196//config: Familiar character generator internal inetd service
Denys Vlasenko47367e12016-11-23 09:05:14 +0100197//config:
198//config:config FEATURE_INETD_RPC
199//config: bool "Support RPC services"
200//config: default n # very rarely used, and needs Sun RPC support in libc
201//config: depends on INETD
202//config: select FEATURE_HAVE_RPC
203//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +0200204//config: Support Sun-RPC based services
Denys Vlasenko47367e12016-11-23 09:05:14 +0100205
206//applet:IF_INETD(APPLET(inetd, BB_DIR_USR_SBIN, BB_SUID_DROP))
207
208//kbuild:lib-$(CONFIG_INETD) += inetd.o
Glenn L McGrath06e95652003-02-09 06:51:14 +0000209
Pere Orga5bc8c002011-04-11 03:29:49 +0200210//usage:#define inetd_trivial_usage
211//usage: "[-fe] [-q N] [-R N] [CONFFILE]"
212//usage:#define inetd_full_usage "\n\n"
213//usage: "Listen for network connections and launch programs\n"
Pere Orga5bc8c002011-04-11 03:29:49 +0200214//usage: "\n -f Run in foreground"
215//usage: "\n -e Log to stderr"
Denys Vlasenkof3d705f2017-01-21 03:46:35 +0100216//usage: "\n -q N Socket listen queue (default 128)"
Pere Orga5bc8c002011-04-11 03:29:49 +0200217//usage: "\n -R N Pause services after N connects/min"
Denys Vlasenkof3d705f2017-01-21 03:46:35 +0100218//usage: "\n (default 0 - disabled)"
Pere Orga5bc8c002011-04-11 03:29:49 +0200219
Rob Landleyd921b2e2006-08-03 15:41:12 +0000220#include <syslog.h>
Mike Frysingerc5fe9f72012-07-05 23:19:09 -0400221#include <sys/resource.h> /* setrlimit */
Tias Guns64f763b2012-06-10 14:19:01 +0200222#include <sys/socket.h> /* un.h may need this */
Rob Landley099ed502006-08-28 09:41:49 +0000223#include <sys/un.h>
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000224
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000225#include "libbb.h"
Denys Vlasenkoe6a2f4c2016-04-21 16:26:30 +0200226#include "common_bufsiz.h"
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000227
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +0000228#if ENABLE_FEATURE_INETD_RPC
Bernhard Reutner-Fischer901a53b2011-06-15 09:38:43 +0200229# if defined(__UCLIBC__) && ! defined(__UCLIBC_HAS_RPC__)
Denys Vlasenkoce552842017-07-10 14:43:22 +0200230# warning "You probably need to build uClibc with UCLIBC_HAS_RPC for NFS support"
231 /* not #error, since user may be using e.g. libtirpc instead */
Bernhard Reutner-Fischer901a53b2011-06-15 09:38:43 +0200232# endif
233# include <rpc/rpc.h>
234# include <rpc/pmap_clnt.h>
Glenn L McGrathff6ec8a2004-01-17 02:47:45 +0000235#endif
236
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000237#if !BB_MMU
238/* stream version of chargen is forking but not execing,
239 * can't do that (easily) on NOMMU */
240#undef ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
241#define ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN 0
242#endif
243
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000244#define CNT_INTERVAL 60 /* servers in CNT_INTERVAL sec. */
245#define RETRYTIME 60 /* retry after bind or server fail */
246
247// TODO: explain, or get rid of setrlimit games
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000248
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000249#ifndef RLIMIT_NOFILE
250#define RLIMIT_NOFILE RLIMIT_OFILE
251#endif
252
253#ifndef OPEN_MAX
254#define OPEN_MAX 64
255#endif
Glenn L McGrath06e95652003-02-09 06:51:14 +0000256
257/* Reserve some descriptors, 3 stdio + at least: 1 log, 1 conf. file */
Denis Vlasenkof8138d12007-01-11 23:26:13 +0000258#define FD_MARGIN 8
Glenn L McGrath06e95652003-02-09 06:51:14 +0000259
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000260#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD \
261 || ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO \
262 || ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN \
263 || ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME \
264 || ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
265# define INETD_BUILTINS_ENABLED
Glenn L McGrath06e95652003-02-09 06:51:14 +0000266#endif
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000267
Denis Vlasenko512a5452007-09-24 10:41:30 +0000268typedef struct servtab_t {
Denis Vlasenko39824072007-09-26 10:46:18 +0000269 /* The most frequently referenced one: */
270 int se_fd; /* open descriptor */
271 /* NB: 'biggest fields last' saves on code size (~250 bytes) */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000272 /* [addr:]service socktype proto wait user[:group] prog [args] */
273 char *se_local_hostname; /* addr to listen on */
274 char *se_service; /* "80" or "www" or "mount/2[-3]" */
275 /* socktype is in se_socktype */ /* "stream" "dgram" "raw" "rdm" "seqpacket" */
276 char *se_proto; /* "unix" or "[rpc/]tcp[6]" */
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +0000277#if ENABLE_FEATURE_INETD_RPC
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000278 int se_rpcprog; /* rpc program number */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000279 int se_rpcver_lo; /* rpc program lowest version */
280 int se_rpcver_hi; /* rpc program highest version */
281#define is_rpc_service(sep) ((sep)->se_rpcver_lo != 0)
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000282#else
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000283#define is_rpc_service(sep) 0
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000284#endif
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000285 pid_t se_wait; /* 0:"nowait", 1:"wait", >1:"wait" */
286 /* and waiting for this pid */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000287 socktype_t se_socktype; /* SOCK_STREAM/DGRAM/RDM/... */
288 family_t se_family; /* AF_UNIX/INET[6] */
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000289 /* se_proto_no is used by RPC code only... hmm */
290 smallint se_proto_no; /* IPPROTO_TCP/UDP, n/a for AF_UNIX */
Denis Vlasenko512a5452007-09-24 10:41:30 +0000291 smallint se_checked; /* looked at during merge */
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000292 unsigned se_max; /* allowed instances per minute */
293 unsigned se_count; /* number started since se_time */
Denis Vlasenko4cb576e2008-11-05 11:36:22 +0000294 unsigned se_time; /* when we started counting */
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000295 char *se_user; /* user name to run as */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000296 char *se_group; /* group name to run as, can be NULL */
297#ifdef INETD_BUILTINS_ENABLED
298 const struct builtin *se_builtin; /* if built-in, description */
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000299#endif
Denis Vlasenko39824072007-09-26 10:46:18 +0000300 struct servtab_t *se_next;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000301 len_and_sockaddr *se_lsa;
302 char *se_program; /* server program */
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000303#define MAXARGV 20
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000304 char *se_argv[MAXARGV + 1]; /* program arguments */
Glenn L McGrath03a06432004-02-18 13:19:58 +0000305} servtab_t;
306
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000307#ifdef INETD_BUILTINS_ENABLED
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000308/* Echo received data */
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +0000309#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +0200310static void FAST_FUNC echo_stream(int, servtab_t *);
311static void FAST_FUNC echo_dg(int, servtab_t *);
Glenn L McGrath06e95652003-02-09 06:51:14 +0000312#endif
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000313/* Internet /dev/null */
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +0000314#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +0200315static void FAST_FUNC discard_stream(int, servtab_t *);
316static void FAST_FUNC discard_dg(int, servtab_t *);
Glenn L McGrath06e95652003-02-09 06:51:14 +0000317#endif
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000318/* Return 32 bit time since 1900 */
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +0000319#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +0200320static void FAST_FUNC machtime_stream(int, servtab_t *);
321static void FAST_FUNC machtime_dg(int, servtab_t *);
Glenn L McGrath06e95652003-02-09 06:51:14 +0000322#endif
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000323/* Return human-readable time */
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +0000324#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +0200325static void FAST_FUNC daytime_stream(int, servtab_t *);
326static void FAST_FUNC daytime_dg(int, servtab_t *);
Glenn L McGrath06e95652003-02-09 06:51:14 +0000327#endif
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000328/* Familiar character generator */
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +0000329#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +0200330static void FAST_FUNC chargen_stream(int, servtab_t *);
331static void FAST_FUNC chargen_dg(int, servtab_t *);
Glenn L McGrath06e95652003-02-09 06:51:14 +0000332#endif
333
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000334struct builtin {
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000335 /* NB: not necessarily NUL terminated */
336 char bi_service7[7]; /* internally provided service name */
337 uint8_t bi_fork; /* 1 if stream fn should run in child */
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +0200338 void (*bi_stream_fn)(int, servtab_t *) FAST_FUNC;
339 void (*bi_dgram_fn)(int, servtab_t *) FAST_FUNC;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000340};
341
Bernhard Reutner-Fischera4acf662006-04-10 12:26:47 +0000342static const struct builtin builtins[] = {
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +0000343#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000344 { "echo", 1, echo_stream, echo_dg },
Glenn L McGrath06e95652003-02-09 06:51:14 +0000345#endif
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +0000346#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000347 { "discard", 1, discard_stream, discard_dg },
Glenn L McGrath06e95652003-02-09 06:51:14 +0000348#endif
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +0000349#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000350 { "chargen", 1, chargen_stream, chargen_dg },
Glenn L McGrath06e95652003-02-09 06:51:14 +0000351#endif
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000352#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000353 { "time", 0, machtime_stream, machtime_dg },
354#endif
355#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000356 { "daytime", 0, daytime_stream, daytime_dg },
357#endif
Glenn L McGrath06e95652003-02-09 06:51:14 +0000358};
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000359#endif /* INETD_BUILTINS_ENABLED */
Glenn L McGrath06e95652003-02-09 06:51:14 +0000360
Denis Vlasenko512a5452007-09-24 10:41:30 +0000361struct globals {
362 rlim_t rlim_ofile_cur;
363 struct rlimit rlim_ofile;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000364 servtab_t *serv_list;
Denis Vlasenko512a5452007-09-24 10:41:30 +0000365 int global_queuelen;
Denys Vlasenkofb132e42010-10-29 11:46:52 +0200366 int maxsock; /* max fd# in allsock, -1: unknown */
Denis Vlasenko4cb576e2008-11-05 11:36:22 +0000367 /* whenever maxsock grows, prev_maxsock is set to new maxsock,
368 * but if maxsock is set to -1, prev_maxsock is not changed */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000369 int prev_maxsock;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000370 unsigned max_concurrency;
371 smallint alarm_armed;
372 uid_t real_uid; /* user ID who ran us */
Denis Vlasenko512a5452007-09-24 10:41:30 +0000373 const char *config_filename;
Denis Vlasenkodf6b3ad2008-09-30 01:22:25 +0000374 parser_t *parser;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000375 char *default_local_hostname;
Denis Vlasenko512a5452007-09-24 10:41:30 +0000376#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000377 char *end_ring;
378 char *ring_pos;
Denis Vlasenko512a5452007-09-24 10:41:30 +0000379 char ring[128];
380#endif
381 fd_set allsock;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000382 /* Used in next_line(), and as scratch read buffer */
383 char line[256]; /* _at least_ 256, see LINE_SIZE */
Denys Vlasenko98a4c7c2010-02-04 15:00:15 +0100384} FIX_ALIASING;
Denys Vlasenkoe6a2f4c2016-04-21 16:26:30 +0200385#define G (*(struct globals*)bb_common_bufsiz1)
Denis Vlasenko512a5452007-09-24 10:41:30 +0000386enum { LINE_SIZE = COMMON_BUFSIZE - offsetof(struct globals, line) };
Denis Vlasenko512a5452007-09-24 10:41:30 +0000387#define rlim_ofile_cur (G.rlim_ofile_cur )
388#define rlim_ofile (G.rlim_ofile )
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000389#define serv_list (G.serv_list )
Denis Vlasenko512a5452007-09-24 10:41:30 +0000390#define global_queuelen (G.global_queuelen)
Denis Vlasenko512a5452007-09-24 10:41:30 +0000391#define maxsock (G.maxsock )
Denis Vlasenko4cb576e2008-11-05 11:36:22 +0000392#define prev_maxsock (G.prev_maxsock )
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000393#define max_concurrency (G.max_concurrency)
394#define alarm_armed (G.alarm_armed )
395#define real_uid (G.real_uid )
Denis Vlasenko512a5452007-09-24 10:41:30 +0000396#define config_filename (G.config_filename)
Denis Vlasenkodf6b3ad2008-09-30 01:22:25 +0000397#define parser (G.parser )
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000398#define default_local_hostname (G.default_local_hostname)
399#define first_ps_byte (G.first_ps_byte )
400#define last_ps_byte (G.last_ps_byte )
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000401#define end_ring (G.end_ring )
402#define ring_pos (G.ring_pos )
Denis Vlasenko512a5452007-09-24 10:41:30 +0000403#define ring (G.ring )
404#define allsock (G.allsock )
405#define line (G.line )
406#define INIT_G() do { \
Denys Vlasenko47cfbf32016-04-21 18:18:48 +0200407 setup_common_bufsiz(); \
Denys Vlasenko7b85ec32015-10-13 17:17:34 +0200408 BUILD_BUG_ON(sizeof(G) > COMMON_BUFSIZE); \
Denis Vlasenko512a5452007-09-24 10:41:30 +0000409 rlim_ofile_cur = OPEN_MAX; \
410 global_queuelen = 128; \
411 config_filename = "/etc/inetd.conf"; \
412} while (0)
Glenn L McGrath06e95652003-02-09 06:51:14 +0000413
Denys Vlasenko223b9412011-09-11 16:48:21 +0200414#if 1
415# define dbg(...) ((void)0)
416#else
417# define dbg(...) \
418do { \
419 int dbg_fd = open("inetd_debug.log", O_WRONLY | O_CREAT | O_APPEND, 0666); \
420 if (dbg_fd >= 0) { \
421 fdprintf(dbg_fd, "%d: ", getpid()); \
422 fdprintf(dbg_fd, __VA_ARGS__); \
423 close(dbg_fd); \
424 } \
425} while (0)
426#endif
427
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000428static void maybe_close(int fd)
Glenn L McGrath06e95652003-02-09 06:51:14 +0000429{
Denys Vlasenko223b9412011-09-11 16:48:21 +0200430 if (fd >= 0) {
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000431 close(fd);
Denys Vlasenko223b9412011-09-11 16:48:21 +0200432 dbg("closed fd:%d\n", fd);
433 }
Glenn L McGrath06e95652003-02-09 06:51:14 +0000434}
435
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000436// TODO: move to libbb?
437static len_and_sockaddr *xzalloc_lsa(int family)
Glenn L McGrathdf7d84c2004-02-22 11:25:13 +0000438{
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000439 len_and_sockaddr *lsa;
440 int sz;
441
442 sz = sizeof(struct sockaddr_in);
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000443 if (family == AF_UNIX)
444 sz = sizeof(struct sockaddr_un);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000445#if ENABLE_FEATURE_IPV6
446 if (family == AF_INET6)
447 sz = sizeof(struct sockaddr_in6);
448#endif
449 lsa = xzalloc(LSA_LEN_SIZE + sz);
450 lsa->len = sz;
451 lsa->u.sa.sa_family = family;
Denis Vlasenkoc6938402008-03-24 02:18:03 +0000452 return lsa;
Glenn L McGrathdf7d84c2004-02-22 11:25:13 +0000453}
454
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000455static void rearm_alarm(void)
Glenn L McGrath06e95652003-02-09 06:51:14 +0000456{
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000457 if (!alarm_armed) {
458 alarm_armed = 1;
459 alarm(RETRYTIME);
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000460 }
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000461}
462
463static void block_CHLD_HUP_ALRM(sigset_t *m)
464{
465 sigemptyset(m);
466 sigaddset(m, SIGCHLD);
467 sigaddset(m, SIGHUP);
468 sigaddset(m, SIGALRM);
Denis Vlasenko3f165fa2008-03-17 08:29:08 +0000469 sigprocmask(SIG_BLOCK, m, m); /* old sigmask is stored in m */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000470}
471
Denis Vlasenko3f165fa2008-03-17 08:29:08 +0000472static void restore_sigmask(sigset_t *m)
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000473{
Denis Vlasenko3f165fa2008-03-17 08:29:08 +0000474 sigprocmask(SIG_SETMASK, m, NULL);
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000475}
Glenn L McGrath53766c42004-01-18 08:58:06 +0000476
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +0000477#if ENABLE_FEATURE_INETD_RPC
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000478static void register_rpc(servtab_t *sep)
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000479{
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000480 int n;
481 struct sockaddr_in ir_sin;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000482 socklen_t size;
Glenn L McGrath06e95652003-02-09 06:51:14 +0000483
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000484 size = sizeof(ir_sin);
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000485 if (getsockname(sep->se_fd, (struct sockaddr *) &ir_sin, &size) < 0) {
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000486 bb_perror_msg("getsockname");
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000487 return;
488 }
Glenn L McGratheaf5bc02004-01-20 15:32:39 +0000489
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000490 for (n = sep->se_rpcver_lo; n <= sep->se_rpcver_hi; n++) {
491 pmap_unset(sep->se_rpcprog, n);
492 if (!pmap_set(sep->se_rpcprog, n, sep->se_proto_no, ntohs(ir_sin.sin_port)))
493 bb_perror_msg("%s %s: pmap_set(%u,%u,%u,%u)",
494 sep->se_service, sep->se_proto,
495 sep->se_rpcprog, n, sep->se_proto_no, ntohs(ir_sin.sin_port));
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000496 }
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000497}
Glenn L McGrath06e95652003-02-09 06:51:14 +0000498
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000499static void unregister_rpc(servtab_t *sep)
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000500{
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000501 int n;
Glenn L McGratheaf5bc02004-01-20 15:32:39 +0000502
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000503 for (n = sep->se_rpcver_lo; n <= sep->se_rpcver_hi; n++) {
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000504 if (!pmap_unset(sep->se_rpcprog, n))
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000505 bb_perror_msg("pmap_unset(%u,%u)", sep->se_rpcprog, n);
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000506 }
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000507}
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +0000508#endif /* FEATURE_INETD_RPC */
Glenn L McGratheaf5bc02004-01-20 15:32:39 +0000509
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000510static void bump_nofile(void)
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000511{
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000512 enum { FD_CHUNK = 32 };
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000513 struct rlimit rl;
Glenn L McGrath06e95652003-02-09 06:51:14 +0000514
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000515 /* Never fails under Linux (except if you pass it bad arguments) */
516 getrlimit(RLIMIT_NOFILE, &rl);
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000517 rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK);
518 rl.rlim_cur = MIN(FD_SETSIZE, rl.rlim_cur + FD_CHUNK);
519 if (rl.rlim_cur <= rlim_ofile_cur) {
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000520 bb_error_msg("can't extend file limit, max = %d",
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000521 (int) rl.rlim_cur);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000522 return;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000523 }
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000524
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000525 if (setrlimit(RLIMIT_NOFILE, &rl) < 0) {
526 bb_perror_msg("setrlimit");
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000527 return;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000528 }
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000529
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000530 rlim_ofile_cur = rl.rlim_cur;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000531}
532
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000533static void remove_fd_from_set(int fd)
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000534{
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000535 if (fd >= 0) {
536 FD_CLR(fd, &allsock);
Denys Vlasenko223b9412011-09-11 16:48:21 +0200537 dbg("stopped listening on fd:%d\n", fd);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000538 maxsock = -1;
Denys Vlasenko223b9412011-09-11 16:48:21 +0200539 dbg("maxsock:%d\n", maxsock);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000540 }
541}
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000542
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000543static void add_fd_to_set(int fd)
544{
545 if (fd >= 0) {
546 FD_SET(fd, &allsock);
Denys Vlasenko223b9412011-09-11 16:48:21 +0200547 dbg("started listening on fd:%d\n", fd);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000548 if (maxsock >= 0 && fd > maxsock) {
549 prev_maxsock = maxsock = fd;
Denys Vlasenko223b9412011-09-11 16:48:21 +0200550 dbg("maxsock:%d\n", maxsock);
Denis Vlasenko4cb576e2008-11-05 11:36:22 +0000551 if ((rlim_t)fd > rlim_ofile_cur - FD_MARGIN)
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000552 bump_nofile();
553 }
554 }
555}
556
557static void recalculate_maxsock(void)
558{
559 int fd = 0;
Denis Vlasenko4cb576e2008-11-05 11:36:22 +0000560
561 /* We may have no services, in this case maxsock should still be >= 0
562 * (code elsewhere is not happy with maxsock == -1) */
563 maxsock = 0;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000564 while (fd <= prev_maxsock) {
565 if (FD_ISSET(fd, &allsock))
566 maxsock = fd;
567 fd++;
568 }
Denys Vlasenko223b9412011-09-11 16:48:21 +0200569 dbg("recalculated maxsock:%d\n", maxsock);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000570 prev_maxsock = maxsock;
571 if ((rlim_t)maxsock > rlim_ofile_cur - FD_MARGIN)
572 bump_nofile();
573}
574
575static void prepare_socket_fd(servtab_t *sep)
576{
577 int r, fd;
578
579 fd = socket(sep->se_family, sep->se_socktype, 0);
580 if (fd < 0) {
581 bb_perror_msg("socket");
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000582 return;
583 }
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000584 setsockopt_reuseaddr(fd);
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000585
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +0000586#if ENABLE_FEATURE_INETD_RPC
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000587 if (is_rpc_service(sep)) {
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000588 struct passwd *pwd;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000589
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000590 /* zero out the port for all RPC services; let bind()
591 * find one. */
Denys Vlasenkoca183112011-04-07 17:52:20 +0200592 set_nport(&sep->se_lsa->u.sa, 0);
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000593
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000594 /* for RPC services, attempt to use a reserved port
595 * if they are going to be running as root. */
596 if (real_uid == 0 && sep->se_family == AF_INET
597 && (pwd = getpwnam(sep->se_user)) != NULL
598 && pwd->pw_uid == 0
599 ) {
600 r = bindresvport(fd, &sep->se_lsa->u.sin);
601 } else {
602 r = bind(fd, &sep->se_lsa->u.sa, sep->se_lsa->len);
603 }
604 if (r == 0) {
605 int saveerrno = errno;
606 /* update lsa with port# */
607 getsockname(fd, &sep->se_lsa->u.sa, &sep->se_lsa->len);
608 errno = saveerrno;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000609 }
610 } else
Glenn L McGrath53766c42004-01-18 08:58:06 +0000611#endif
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000612 {
613 if (sep->se_family == AF_UNIX) {
614 struct sockaddr_un *sun;
615 sun = (struct sockaddr_un*)&(sep->se_lsa->u.sa);
616 unlink(sun->sun_path);
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000617 }
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000618 r = bind(fd, &sep->se_lsa->u.sa, sep->se_lsa->len);
619 }
620 if (r < 0) {
621 bb_perror_msg("%s/%s: bind",
622 sep->se_service, sep->se_proto);
623 close(fd);
624 rearm_alarm();
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000625 return;
Glenn L McGrath53766c42004-01-18 08:58:06 +0000626 }
Denys Vlasenko223b9412011-09-11 16:48:21 +0200627
628 if (sep->se_socktype == SOCK_STREAM) {
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000629 listen(fd, global_queuelen);
Denys Vlasenko223b9412011-09-11 16:48:21 +0200630 dbg("new sep->se_fd:%d (stream)\n", fd);
631 } else {
632 dbg("new sep->se_fd:%d (!stream)\n", fd);
633 }
Glenn L McGrath53766c42004-01-18 08:58:06 +0000634
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000635 add_fd_to_set(fd);
636 sep->se_fd = fd;
637}
638
639static int reopen_config_file(void)
640{
641 free(default_local_hostname);
642 default_local_hostname = xstrdup("*");
Denis Vlasenkodf6b3ad2008-09-30 01:22:25 +0000643 if (parser != NULL)
644 config_close(parser);
645 parser = config_open(config_filename);
646 return (parser != NULL);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000647}
648
649static void close_config_file(void)
650{
Denis Vlasenkodf6b3ad2008-09-30 01:22:25 +0000651 if (parser) {
652 config_close(parser);
653 parser = NULL;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000654 }
Glenn L McGrath06e95652003-02-09 06:51:14 +0000655}
656
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000657static void free_servtab_strings(servtab_t *cp)
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000658{
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000659 int i;
660
661 free(cp->se_local_hostname);
662 free(cp->se_service);
663 free(cp->se_proto);
664 free(cp->se_user);
665 free(cp->se_group);
666 free(cp->se_lsa); /* not a string in fact */
667 free(cp->se_program);
668 for (i = 0; i < MAXARGV; i++)
669 free(cp->se_argv[i]);
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000670}
671
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000672static servtab_t *new_servtab(void)
673{
674 servtab_t *newtab = xzalloc(sizeof(servtab_t));
675 newtab->se_fd = -1; /* paranoia */
676 return newtab;
677}
678
679static servtab_t *dup_servtab(servtab_t *sep)
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000680{
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000681 servtab_t *newtab;
682 int argc;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000683
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000684 newtab = new_servtab();
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000685 *newtab = *sep; /* struct copy */
686 /* deep-copying strings */
687 newtab->se_service = xstrdup(newtab->se_service);
688 newtab->se_proto = xstrdup(newtab->se_proto);
689 newtab->se_user = xstrdup(newtab->se_user);
690 newtab->se_group = xstrdup(newtab->se_group);
691 newtab->se_program = xstrdup(newtab->se_program);
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000692 for (argc = 0; argc <= MAXARGV; argc++)
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000693 newtab->se_argv[argc] = xstrdup(newtab->se_argv[argc]);
694 /* NB: se_fd, se_hostaddr and se_next are always
695 * overwrittend by callers, so we don't bother resetting them
696 * to NULL/0/-1 etc */
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000697
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000698 return newtab;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000699}
700
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000701/* gcc generates much more code if this is inlined */
Denys Vlasenko2ec4f442015-03-03 13:10:30 +0100702static NOINLINE servtab_t *parse_one_line(void)
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000703{
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000704 int argc;
Denis Vlasenkodf6b3ad2008-09-30 01:22:25 +0000705 char *token[6+MAXARGV];
706 char *p, *arg;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000707 char *hostdelim;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000708 servtab_t *sep;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000709 servtab_t *nsep;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000710 new:
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000711 sep = new_servtab();
Denis Vlasenko13858992006-10-08 12:49:22 +0000712 more:
Denis Vlasenkodf6b3ad2008-09-30 01:22:25 +0000713 argc = config_read(parser, token, 6+MAXARGV, 1, "# \t", PARSE_NORMAL);
714 if (!argc) {
Denis Vlasenko6df9e3c2007-11-12 21:21:35 +0000715 free(sep);
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000716 return NULL;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000717 }
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000718
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000719 /* [host:]service socktype proto wait user[:group] prog [args] */
720 /* Check for "host:...." line */
Denis Vlasenkodf6b3ad2008-09-30 01:22:25 +0000721 arg = token[0];
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000722 hostdelim = strrchr(arg, ':');
723 if (hostdelim) {
724 *hostdelim = '\0';
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000725 sep->se_local_hostname = xstrdup(arg);
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000726 arg = hostdelim + 1;
Denis Vlasenkodf6b3ad2008-09-30 01:22:25 +0000727 if (*arg == '\0' && argc == 1) {
728 /* Line has just "host:", change the
729 * default host for the following lines. */
730 free(default_local_hostname);
731 default_local_hostname = sep->se_local_hostname;
Denys Vlasenko2ec4f442015-03-03 13:10:30 +0100732 /*sep->se_local_hostname = NULL; - redundant */
733 /* (we'll overwrite this field anyway) */
Denis Vlasenkodf6b3ad2008-09-30 01:22:25 +0000734 goto more;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000735 }
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000736 } else
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000737 sep->se_local_hostname = xstrdup(default_local_hostname);
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000738
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000739 /* service socktype proto wait user[:group] prog [args] */
740 sep->se_service = xstrdup(arg);
Denis Vlasenkodf6b3ad2008-09-30 01:22:25 +0000741
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000742 /* socktype proto wait user[:group] prog [args] */
Denis Vlasenkodf6b3ad2008-09-30 01:22:25 +0000743 if (argc < 6) {
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000744 parse_err:
745 bb_error_msg("parse error on line %u, line is ignored",
Denis Vlasenkodf6b3ad2008-09-30 01:22:25 +0000746 parser->lineno);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000747 /* Just "goto more" can make sep to carry over e.g.
748 * "rpc"-ness (by having se_rpcver_lo != 0).
749 * We will be more paranoid: */
Denys Vlasenko2ec4f442015-03-03 13:10:30 +0100750 free_servtab_strings(sep);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000751 free(sep);
752 goto new;
753 }
Denis Vlasenkodf6b3ad2008-09-30 01:22:25 +0000754
Denis Vlasenko9d1afdb2007-10-30 19:54:39 +0000755 {
Denis Vlasenkoeb4e5ec2009-04-22 23:25:48 +0000756 static const int8_t SOCK_xxx[] ALIGN1 = {
Denis Vlasenko9d1afdb2007-10-30 19:54:39 +0000757 -1,
758 SOCK_STREAM, SOCK_DGRAM, SOCK_RDM,
759 SOCK_SEQPACKET, SOCK_RAW
760 };
761 sep->se_socktype = SOCK_xxx[1 + index_in_strings(
762 "stream""\0" "dgram""\0" "rdm""\0"
763 "seqpacket""\0" "raw""\0"
Denis Vlasenkodf6b3ad2008-09-30 01:22:25 +0000764 , token[1])];
Denis Vlasenko9d1afdb2007-10-30 19:54:39 +0000765 }
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000766
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000767 /* {unix,[rpc/]{tcp,udp}[6]} wait user[:group] prog [args] */
Denis Vlasenkodf6b3ad2008-09-30 01:22:25 +0000768 sep->se_proto = arg = xstrdup(token[2]);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000769 if (strcmp(arg, "unix") == 0) {
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000770 sep->se_family = AF_UNIX;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000771 } else {
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000772 char *six;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000773 sep->se_family = AF_INET;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000774 six = last_char_is(arg, '6');
775 if (six) {
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +0000776#if ENABLE_FEATURE_IPV6
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000777 *six = '\0';
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000778 sep->se_family = AF_INET6;
779#else
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000780 bb_error_msg("%s: no support for IPv6", sep->se_proto);
781 goto parse_err;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000782#endif
783 }
Denys Vlasenko8dff01d2015-03-12 17:48:34 +0100784 if (is_prefixed_with(arg, "rpc/")) {
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000785#if ENABLE_FEATURE_INETD_RPC
786 unsigned n;
787 arg += 4;
788 p = strchr(sep->se_service, '/');
789 if (p == NULL) {
790 bb_error_msg("no rpc version: '%s'", sep->se_service);
791 goto parse_err;
792 }
793 *p++ = '\0';
794 n = bb_strtou(p, &p, 10);
795 if (n > INT_MAX) {
796 bad_ver_spec:
797 bb_error_msg("bad rpc version");
798 goto parse_err;
799 }
800 sep->se_rpcver_lo = sep->se_rpcver_hi = n;
801 if (*p == '-') {
802 p++;
803 n = bb_strtou(p, &p, 10);
Denis Vlasenko6b06cb82008-05-15 21:30:45 +0000804 if (n > INT_MAX || (int)n < sep->se_rpcver_lo)
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000805 goto bad_ver_spec;
806 sep->se_rpcver_hi = n;
807 }
808 if (*p != '\0')
809 goto bad_ver_spec;
810#else
811 bb_error_msg("no support for rpc services");
812 goto parse_err;
813#endif
814 }
815 /* we don't really need getprotobyname()! */
816 if (strcmp(arg, "tcp") == 0)
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000817 sep->se_proto_no = IPPROTO_TCP; /* = 6 */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000818 if (strcmp(arg, "udp") == 0)
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000819 sep->se_proto_no = IPPROTO_UDP; /* = 17 */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000820 if (six)
821 *six = '6';
822 if (!sep->se_proto_no) /* not tcp/udp?? */
823 goto parse_err;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000824 }
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000825
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000826 /* [no]wait[.max] user[:group] prog [args] */
Denis Vlasenkodf6b3ad2008-09-30 01:22:25 +0000827 arg = token[3];
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000828 sep->se_max = max_concurrency;
829 p = strchr(arg, '.');
830 if (p) {
831 *p++ = '\0';
832 sep->se_max = bb_strtou(p, NULL, 10);
833 if (errno)
834 goto parse_err;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000835 }
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000836 sep->se_wait = (arg[0] != 'n' || arg[1] != 'o');
837 if (!sep->se_wait) /* "no" seen */
838 arg += 2;
839 if (strcmp(arg, "wait") != 0)
840 goto parse_err;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000841
842 /* user[:group] prog [args] */
Denis Vlasenkodf6b3ad2008-09-30 01:22:25 +0000843 sep->se_user = xstrdup(token[4]);
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000844 arg = strchr(sep->se_user, '.');
845 if (arg == NULL)
846 arg = strchr(sep->se_user, ':');
847 if (arg) {
848 *arg++ = '\0';
849 sep->se_group = xstrdup(arg);
850 }
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000851
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000852 /* prog [args] */
Denis Vlasenkodf6b3ad2008-09-30 01:22:25 +0000853 sep->se_program = xstrdup(token[5]);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000854#ifdef INETD_BUILTINS_ENABLED
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000855 if (strcmp(sep->se_program, "internal") == 0
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000856 && strlen(sep->se_service) <= 7
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000857 && (sep->se_socktype == SOCK_STREAM
858 || sep->se_socktype == SOCK_DGRAM)
859 ) {
Denis Vlasenko6b06cb82008-05-15 21:30:45 +0000860 unsigned i;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000861 for (i = 0; i < ARRAY_SIZE(builtins); i++)
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000862 if (strncmp(builtins[i].bi_service7, sep->se_service, 7) == 0)
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000863 goto found_bi;
864 bb_error_msg("unknown internal service %s", sep->se_service);
865 goto parse_err;
866 found_bi:
867 sep->se_builtin = &builtins[i];
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000868 /* stream builtins must be "nowait", dgram must be "wait" */
869 if (sep->se_wait != (sep->se_socktype == SOCK_DGRAM))
870 goto parse_err;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000871 }
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000872#endif
873 argc = 0;
Denys Vlasenko2ec4f442015-03-03 13:10:30 +0100874 while (argc < MAXARGV && (arg = token[6+argc]) != NULL)
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000875 sep->se_argv[argc++] = xstrdup(arg);
Mike Frysingera945f612010-11-22 04:57:37 +0100876 /* Some inetd.conf files have no argv's, not even argv[0].
877 * Fix them up.
878 * (Technically, programs can be execed with argv[0] = NULL,
879 * but many programs do not like that at all) */
880 if (argc == 0)
881 sep->se_argv[0] = xstrdup(sep->se_program);
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000882
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000883 /* catch mixups. "<service> stream udp ..." == wtf */
884 if (sep->se_socktype == SOCK_STREAM) {
885 if (sep->se_proto_no == IPPROTO_UDP)
886 goto parse_err;
887 }
888 if (sep->se_socktype == SOCK_DGRAM) {
889 if (sep->se_proto_no == IPPROTO_TCP)
890 goto parse_err;
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000891 }
892
Denys Vlasenko066e76b2016-03-30 16:20:28 +0200893 //bb_error_msg(
894 // "ENTRY[%s][%s][%s][%d][%d][%d][%d][%d][%s][%s][%s]",
895 // sep->se_local_hostname, sep->se_service, sep->se_proto, sep->se_wait, sep->se_proto_no,
896 // sep->se_max, sep->se_count, sep->se_time, sep->se_user, sep->se_group, sep->se_program);
Denis Vlasenkodf6b3ad2008-09-30 01:22:25 +0000897
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000898 /* check if the hostname specifier is a comma separated list
899 * of hostnames. we'll make new entries for each address. */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000900 while ((hostdelim = strrchr(sep->se_local_hostname, ',')) != NULL) {
901 nsep = dup_servtab(sep);
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000902 /* NUL terminate the hostname field of the existing entry,
903 * and make a dup for the new entry. */
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000904 *hostdelim++ = '\0';
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000905 nsep->se_local_hostname = xstrdup(hostdelim);
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000906 nsep->se_next = sep->se_next;
907 sep->se_next = nsep;
908 }
909
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000910 /* was doing it here: */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000911 /* DNS resolution, create copies for each IP address */
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000912 /* IPv6-ization destroyed it :( */
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000913
914 return sep;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000915}
916
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000917static servtab_t *insert_in_servlist(servtab_t *cp)
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000918{
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000919 servtab_t *sep;
920 sigset_t omask;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000921
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000922 sep = new_servtab();
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000923 *sep = *cp; /* struct copy */
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000924 sep->se_fd = -1;
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +0000925#if ENABLE_FEATURE_INETD_RPC
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000926 sep->se_rpcprog = -1;
927#endif
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000928 block_CHLD_HUP_ALRM(&omask);
929 sep->se_next = serv_list;
930 serv_list = sep;
Denis Vlasenko3f165fa2008-03-17 08:29:08 +0000931 restore_sigmask(&omask);
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000932 return sep;
933}
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000934
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000935static int same_serv_addr_proto(servtab_t *old, servtab_t *new)
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000936{
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000937 if (strcmp(old->se_local_hostname, new->se_local_hostname) != 0)
938 return 0;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000939 if (strcmp(old->se_service, new->se_service) != 0)
940 return 0;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000941 if (strcmp(old->se_proto, new->se_proto) != 0)
942 return 0;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000943 return 1;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000944}
945
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +0000946static void reread_config_file(int sig UNUSED_PARAM)
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000947{
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000948 servtab_t *sep, *cp, **sepp;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000949 len_and_sockaddr *lsa;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000950 sigset_t omask;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000951 unsigned n;
952 uint16_t port;
Denis Vlasenkof54e62a2008-07-22 20:57:28 +0000953 int save_errno = errno;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000954
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000955 if (!reopen_config_file())
Denis Vlasenkof54e62a2008-07-22 20:57:28 +0000956 goto ret;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000957 for (sep = serv_list; sep; sep = sep->se_next)
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000958 sep->se_checked = 0;
Bernhard Reutner-Fischerd591a362006-08-20 17:35:13 +0000959
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000960 goto first_line;
961 while (1) {
962 if (cp == NULL) {
963 first_line:
964 cp = parse_one_line();
965 if (cp == NULL)
966 break;
967 }
968 for (sep = serv_list; sep; sep = sep->se_next)
969 if (same_serv_addr_proto(sep, cp))
970 goto equal_servtab;
971 /* not an "equal" servtab */
972 sep = insert_in_servlist(cp);
973 goto after_check;
974 equal_servtab:
975 {
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000976 int i;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000977
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000978 block_CHLD_HUP_ALRM(&omask);
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +0000979#if ENABLE_FEATURE_INETD_RPC
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000980 if (is_rpc_service(sep))
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000981 unregister_rpc(sep);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000982 sep->se_rpcver_lo = cp->se_rpcver_lo;
983 sep->se_rpcver_hi = cp->se_rpcver_hi;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000984#endif
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000985 if (cp->se_wait == 0) {
986 /* New config says "nowait". If old one
987 * was "wait", we currently may be waiting
988 * for a child (and not accepting connects).
989 * Stop waiting, start listening again.
990 * (if it's not true, this op is harmless) */
991 add_fd_to_set(sep->se_fd);
992 }
993 sep->se_wait = cp->se_wait;
994 sep->se_max = cp->se_max;
995 /* string fields need more love - we don't want to leak them */
996#define SWAP(type, a, b) do { type c = (type)a; a = (type)b; b = (type)c; } while (0)
997 SWAP(char*, sep->se_user, cp->se_user);
998 SWAP(char*, sep->se_group, cp->se_group);
999 SWAP(char*, sep->se_program, cp->se_program);
1000 for (i = 0; i < MAXARGV; i++)
1001 SWAP(char*, sep->se_argv[i], cp->se_argv[i]);
1002#undef SWAP
Denis Vlasenko3f165fa2008-03-17 08:29:08 +00001003 restore_sigmask(&omask);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001004 free_servtab_strings(cp);
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001005 }
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001006 after_check:
1007 /* cp->string_fields are consumed by insert_in_servlist()
1008 * or freed at this point, cp itself is not yet freed. */
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001009 sep->se_checked = 1;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001010
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001011 /* create new len_and_sockaddr */
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001012 switch (sep->se_family) {
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001013 struct sockaddr_un *sun;
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001014 case AF_UNIX:
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001015 lsa = xzalloc_lsa(AF_UNIX);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001016 sun = (struct sockaddr_un*)&lsa->u.sa;
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001017 safe_strncpy(sun->sun_path, sep->se_service, sizeof(sun->sun_path));
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001018 break;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001019
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001020 default: /* case AF_INET, case AF_INET6 */
1021 n = bb_strtou(sep->se_service, NULL, 10);
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +00001022#if ENABLE_FEATURE_INETD_RPC
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001023 if (is_rpc_service(sep)) {
1024 sep->se_rpcprog = n;
1025 if (errno) { /* se_service is not numeric */
1026 struct rpcent *rp = getrpcbyname(sep->se_service);
1027 if (rp == NULL) {
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001028 bb_error_msg("%s: unknown rpc service", sep->se_service);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001029 goto next_cp;
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001030 }
1031 sep->se_rpcprog = rp->r_number;
1032 }
1033 if (sep->se_fd == -1)
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001034 prepare_socket_fd(sep);
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001035 if (sep->se_fd != -1)
1036 register_rpc(sep);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001037 goto next_cp;
1038 }
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001039#endif
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001040 /* what port to listen on? */
1041 port = htons(n);
1042 if (errno || n > 0xffff) { /* se_service is not numeric */
1043 char protoname[4];
1044 struct servent *sp;
1045 /* can result only in "tcp" or "udp": */
1046 safe_strncpy(protoname, sep->se_proto, 4);
1047 sp = getservbyname(sep->se_service, protoname);
1048 if (sp == NULL) {
1049 bb_error_msg("%s/%s: unknown service",
1050 sep->se_service, sep->se_proto);
1051 goto next_cp;
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001052 }
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001053 port = sp->s_port;
1054 }
1055 if (LONE_CHAR(sep->se_local_hostname, '*')) {
1056 lsa = xzalloc_lsa(sep->se_family);
Denys Vlasenkoca183112011-04-07 17:52:20 +02001057 set_nport(&lsa->u.sa, port);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001058 } else {
1059 lsa = host_and_af2sockaddr(sep->se_local_hostname,
1060 ntohs(port), sep->se_family);
1061 if (!lsa) {
1062 bb_error_msg("%s/%s: unknown host '%s'",
1063 sep->se_service, sep->se_proto,
1064 sep->se_local_hostname);
1065 goto next_cp;
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001066 }
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001067 }
1068 break;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001069 } /* end of "switch (sep->se_family)" */
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001070
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001071 /* did lsa change? Then close/open */
1072 if (sep->se_lsa == NULL
1073 || lsa->len != sep->se_lsa->len
1074 || memcmp(&lsa->u.sa, &sep->se_lsa->u.sa, lsa->len) != 0
1075 ) {
1076 remove_fd_from_set(sep->se_fd);
1077 maybe_close(sep->se_fd);
1078 free(sep->se_lsa);
1079 sep->se_lsa = lsa;
1080 sep->se_fd = -1;
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001081 } else {
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001082 free(lsa);
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001083 }
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001084 if (sep->se_fd == -1)
1085 prepare_socket_fd(sep);
1086 next_cp:
1087 sep = cp->se_next;
1088 free(cp);
1089 cp = sep;
1090 } /* end of "while (1) parse lines" */
1091 close_config_file();
1092
1093 /* Purge anything not looked at above - these are stale entries,
1094 * new config file doesnt have them. */
1095 block_CHLD_HUP_ALRM(&omask);
1096 sepp = &serv_list;
Denys Vlasenko223b9412011-09-11 16:48:21 +02001097 while ((sep = *sepp) != NULL) {
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001098 if (sep->se_checked) {
1099 sepp = &sep->se_next;
1100 continue;
1101 }
1102 *sepp = sep->se_next;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001103 remove_fd_from_set(sep->se_fd);
1104 maybe_close(sep->se_fd);
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +00001105#if ENABLE_FEATURE_INETD_RPC
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001106 if (is_rpc_service(sep))
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001107 unregister_rpc(sep);
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001108#endif
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001109 if (sep->se_family == AF_UNIX)
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001110 unlink(sep->se_service);
1111 free_servtab_strings(sep);
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001112 free(sep);
1113 }
Denis Vlasenko3f165fa2008-03-17 08:29:08 +00001114 restore_sigmask(&omask);
Denis Vlasenkof54e62a2008-07-22 20:57:28 +00001115 ret:
1116 errno = save_errno;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001117}
1118
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +00001119static void reap_child(int sig UNUSED_PARAM)
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001120{
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001121 pid_t pid;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001122 int status;
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001123 servtab_t *sep;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001124 int save_errno = errno;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001125
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001126 for (;;) {
Denis Vlasenkofb0eba72008-01-02 19:55:04 +00001127 pid = wait_any_nohang(&status);
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001128 if (pid <= 0)
1129 break;
Denis Vlasenkof54e62a2008-07-22 20:57:28 +00001130 for (sep = serv_list; sep; sep = sep->se_next) {
1131 if (sep->se_wait != pid)
1132 continue;
1133 /* One of our "wait" services */
1134 if (WIFEXITED(status) && WEXITSTATUS(status))
Denys Vlasenkocfc21632009-09-04 02:19:46 +02001135 bb_error_msg("%s: exit status %u",
Denis Vlasenkof54e62a2008-07-22 20:57:28 +00001136 sep->se_program, WEXITSTATUS(status));
1137 else if (WIFSIGNALED(status))
Denys Vlasenkocfc21632009-09-04 02:19:46 +02001138 bb_error_msg("%s: exit signal %u",
Denis Vlasenkof54e62a2008-07-22 20:57:28 +00001139 sep->se_program, WTERMSIG(status));
1140 sep->se_wait = 1;
1141 add_fd_to_set(sep->se_fd);
1142 break;
1143 }
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001144 }
1145 errno = save_errno;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001146}
1147
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +00001148static void retry_network_setup(int sig UNUSED_PARAM)
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001149{
Denis Vlasenkof54e62a2008-07-22 20:57:28 +00001150 int save_errno = errno;
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001151 servtab_t *sep;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001152
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001153 alarm_armed = 0;
1154 for (sep = serv_list; sep; sep = sep->se_next) {
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001155 if (sep->se_fd == -1) {
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001156 prepare_socket_fd(sep);
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +00001157#if ENABLE_FEATURE_INETD_RPC
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001158 if (sep->se_fd != -1 && is_rpc_service(sep))
1159 register_rpc(sep);
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001160#endif
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001161 }
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001162 }
Denis Vlasenkof54e62a2008-07-22 20:57:28 +00001163 errno = save_errno;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001164}
1165
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +00001166static void clean_up_and_exit(int sig UNUSED_PARAM)
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001167{
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001168 servtab_t *sep;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001169
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001170 /* XXX signal race walking sep list */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001171 for (sep = serv_list; sep; sep = sep->se_next) {
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001172 if (sep->se_fd == -1)
1173 continue;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001174
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001175 switch (sep->se_family) {
1176 case AF_UNIX:
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001177 unlink(sep->se_service);
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001178 break;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001179 default: /* case AF_INET, AF_INET6 */
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +00001180#if ENABLE_FEATURE_INETD_RPC
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001181 if (sep->se_wait == 1 && is_rpc_service(sep))
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001182 unregister_rpc(sep); /* XXX signal race */
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001183#endif
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001184 break;
1185 }
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001186 if (ENABLE_FEATURE_CLEAN_UP)
1187 close(sep->se_fd);
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001188 }
Anthony G. Basile12677ac2012-12-10 14:49:39 -05001189 remove_pidfile(CONFIG_PID_FILE_PATH "/inetd.pid");
Bernhard Reutner-Fischer636a1f82008-05-19 09:29:47 +00001190 exit(EXIT_SUCCESS);
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001191}
1192
Denis Vlasenko9b49a5e2007-10-11 10:05:36 +00001193int inetd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +00001194int inetd_main(int argc UNUSED_PARAM, char **argv)
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001195{
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001196 struct sigaction sa, saved_pipe_handler;
1197 servtab_t *sep, *sep2;
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001198 struct passwd *pwd;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001199 struct group *grp = grp; /* for compiler */
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001200 int opt;
1201 pid_t pid;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001202 sigset_t omask;
Denis Vlasenko512a5452007-09-24 10:41:30 +00001203
1204 INIT_G();
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001205
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001206 real_uid = getuid();
1207 if (real_uid != 0) /* run by non-root user */
Denis Vlasenko55f30b02007-03-24 22:42:29 +00001208 config_filename = NULL;
Denis Vlasenko5a142022007-03-26 13:20:54 +00001209
Denys Vlasenko237bedd2016-07-06 21:58:02 +02001210 /* -q N, -R N */
1211 opt = getopt32(argv, "R:+feq:+", &max_concurrency, &global_queuelen);
Denis Vlasenko5a142022007-03-26 13:20:54 +00001212 argv += optind;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001213 //argc -= optind;
1214 if (argv[0])
Denis Vlasenko55f30b02007-03-24 22:42:29 +00001215 config_filename = argv[0];
1216 if (config_filename == NULL)
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001217 bb_error_msg_and_die("non-root must specify config file");
Denis Vlasenko5a142022007-03-26 13:20:54 +00001218 if (!(opt & 2))
1219 bb_daemonize_or_rexec(0, argv - optind);
1220 else
1221 bb_sanitize_stdio();
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001222 if (!(opt & 4)) {
Denys Vlasenkocfc21632009-09-04 02:19:46 +02001223 /* LOG_NDELAY: connect to syslog daemon NOW.
1224 * Otherwise, we may open syslog socket
1225 * in vforked child, making opened fds and syslog()
1226 * internal state inconsistent.
1227 * This was observed to leak file descriptors. */
1228 openlog(applet_name, LOG_PID | LOG_NDELAY, LOG_DAEMON);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001229 logmode = LOGMODE_SYSLOG;
1230 }
Eric Andersen35e643b2003-07-28 07:40:39 +00001231
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001232 if (real_uid == 0) {
1233 /* run by root, ensure groups vector gets trashed */
Denis Vlasenko7a431b32007-01-14 01:29:06 +00001234 gid_t gid = getgid();
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001235 setgroups(1, &gid);
1236 }
1237
Anthony G. Basile12677ac2012-12-10 14:49:39 -05001238 write_pidfile(CONFIG_PID_FILE_PATH "/inetd.pid");
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001239
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001240 /* never fails under Linux (except if you pass it bad arguments) */
1241 getrlimit(RLIMIT_NOFILE, &rlim_ofile);
1242 rlim_ofile_cur = rlim_ofile.rlim_cur;
1243 if (rlim_ofile_cur == RLIM_INFINITY) /* ! */
1244 rlim_ofile_cur = OPEN_MAX;
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001245
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001246 memset(&sa, 0, sizeof(sa));
Denis Vlasenko400d8bb2008-02-24 13:36:01 +00001247 /*sigemptyset(&sa.sa_mask); - memset did it */
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001248 sigaddset(&sa.sa_mask, SIGALRM);
1249 sigaddset(&sa.sa_mask, SIGCHLD);
1250 sigaddset(&sa.sa_mask, SIGHUP);
Denys Vlasenkob1ab2832011-05-12 23:05:27 +02001251//FIXME: explain why no SA_RESTART
1252//FIXME: retry_network_setup is unsafe to run in signal handler (many reasons)!
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001253 sa.sa_handler = retry_network_setup;
Denis Vlasenko8e2cfec2008-03-12 23:19:35 +00001254 sigaction_set(SIGALRM, &sa);
Denys Vlasenkob1ab2832011-05-12 23:05:27 +02001255//FIXME: reread_config_file is unsafe to run in signal handler(many reasons)!
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001256 sa.sa_handler = reread_config_file;
Denis Vlasenko8e2cfec2008-03-12 23:19:35 +00001257 sigaction_set(SIGHUP, &sa);
Denys Vlasenkob1ab2832011-05-12 23:05:27 +02001258//FIXME: reap_child is unsafe to run in signal handler (uses stdio)!
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001259 sa.sa_handler = reap_child;
Denis Vlasenko8e2cfec2008-03-12 23:19:35 +00001260 sigaction_set(SIGCHLD, &sa);
Denys Vlasenkob1ab2832011-05-12 23:05:27 +02001261//FIXME: clean_up_and_exit is unsafe to run in signal handler (uses stdio)!
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001262 sa.sa_handler = clean_up_and_exit;
Denis Vlasenko8e2cfec2008-03-12 23:19:35 +00001263 sigaction_set(SIGTERM, &sa);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001264 sa.sa_handler = clean_up_and_exit;
Denis Vlasenko8e2cfec2008-03-12 23:19:35 +00001265 sigaction_set(SIGINT, &sa);
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001266 sa.sa_handler = SIG_IGN;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001267 sigaction(SIGPIPE, &sa, &saved_pipe_handler);
Glenn L McGrath06e95652003-02-09 06:51:14 +00001268
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001269 reread_config_file(SIGHUP); /* load config from file */
Glenn L McGrath06e95652003-02-09 06:51:14 +00001270
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001271 for (;;) {
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001272 int ready_fd_cnt;
Denis Vlasenkoaefed942008-03-17 08:35:44 +00001273 int ctrl, accepted_fd, new_udp_fd;
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001274 fd_set readable;
1275
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001276 if (maxsock < 0)
1277 recalculate_maxsock();
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001278
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001279 readable = allsock; /* struct copy */
1280 /* if there are no fds to wait on, we will block
Denis Vlasenko4cb576e2008-11-05 11:36:22 +00001281 * until signal wakes us up (maxsock == 0, but readable
1282 * never contains fds 0 and 1...) */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001283 ready_fd_cnt = select(maxsock + 1, &readable, NULL, NULL, NULL);
1284 if (ready_fd_cnt < 0) {
1285 if (errno != EINTR) {
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001286 bb_perror_msg("select");
1287 sleep(1);
1288 }
Glenn L McGrath82d42db2004-02-18 13:12:53 +00001289 continue;
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001290 }
Denys Vlasenko223b9412011-09-11 16:48:21 +02001291 dbg("ready_fd_cnt:%d\n", ready_fd_cnt);
Denis Vlasenkoc1876d72006-09-23 15:58:01 +00001292
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001293 for (sep = serv_list; ready_fd_cnt && sep; sep = sep->se_next) {
Denis Vlasenkoc1876d72006-09-23 15:58:01 +00001294 if (sep->se_fd == -1 || !FD_ISSET(sep->se_fd, &readable))
1295 continue;
1296
Denys Vlasenko223b9412011-09-11 16:48:21 +02001297 dbg("ready fd:%d\n", sep->se_fd);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001298 ready_fd_cnt--;
1299 ctrl = sep->se_fd;
1300 accepted_fd = -1;
Denis Vlasenkoaefed942008-03-17 08:35:44 +00001301 new_udp_fd = -1;
1302 if (!sep->se_wait) {
1303 if (sep->se_socktype == SOCK_STREAM) {
1304 ctrl = accepted_fd = accept(sep->se_fd, NULL, NULL);
Denys Vlasenko223b9412011-09-11 16:48:21 +02001305 dbg("accepted_fd:%d\n", accepted_fd);
Denis Vlasenkoaefed942008-03-17 08:35:44 +00001306 if (ctrl < 0) {
1307 if (errno != EINTR)
1308 bb_perror_msg("accept (for %s)", sep->se_service);
1309 continue;
1310 }
1311 }
1312 /* "nowait" udp */
1313 if (sep->se_socktype == SOCK_DGRAM
1314 && sep->se_family != AF_UNIX
1315 ) {
1316/* How udp "nowait" works:
1317 * child peeks at (received and buffered by kernel) UDP packet,
1318 * performs connect() on the socket so that it is linked only
1319 * to this peer. But this also affects parent, because descriptors
1320 * are shared after fork() a-la dup(). When parent performs
1321 * select(), it will see this descriptor connected to the peer (!)
1322 * and still readable, will act on it and mess things up
1323 * (can create many copies of same child, etc).
1324 * Parent must create and use new socket instead. */
1325 new_udp_fd = socket(sep->se_family, SOCK_DGRAM, 0);
Denys Vlasenko223b9412011-09-11 16:48:21 +02001326 dbg("new_udp_fd:%d\n", new_udp_fd);
Denis Vlasenkoaefed942008-03-17 08:35:44 +00001327 if (new_udp_fd < 0) { /* error: eat packet, forget about it */
1328 udp_err:
1329 recv(sep->se_fd, line, LINE_SIZE, MSG_DONTWAIT);
1330 continue;
1331 }
1332 setsockopt_reuseaddr(new_udp_fd);
Denys Vlasenko223b9412011-09-11 16:48:21 +02001333 /* TODO: better do bind after fork in parent,
Denis Vlasenkoaefed942008-03-17 08:35:44 +00001334 * so that we don't have two wildcard bound sockets
1335 * even for a brief moment? */
1336 if (bind(new_udp_fd, &sep->se_lsa->u.sa, sep->se_lsa->len) < 0) {
Denys Vlasenko223b9412011-09-11 16:48:21 +02001337 dbg("bind(new_udp_fd) failed\n");
Denis Vlasenkoaefed942008-03-17 08:35:44 +00001338 close(new_udp_fd);
1339 goto udp_err;
1340 }
Denys Vlasenko223b9412011-09-11 16:48:21 +02001341 dbg("bind(new_udp_fd) succeeded\n");
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001342 }
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001343 }
Denis Vlasenkoc1876d72006-09-23 15:58:01 +00001344
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001345 block_CHLD_HUP_ALRM(&omask);
Denis Vlasenkoc1876d72006-09-23 15:58:01 +00001346 pid = 0;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001347#ifdef INETD_BUILTINS_ENABLED
1348 /* do we need to fork? */
1349 if (sep->se_builtin == NULL
1350 || (sep->se_socktype == SOCK_STREAM
1351 && sep->se_builtin->bi_fork))
Denis Vlasenkoc1876d72006-09-23 15:58:01 +00001352#endif
1353 {
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001354 if (sep->se_max != 0) {
1355 if (++sep->se_count == 1)
1356 sep->se_time = monotonic_sec();
1357 else if (sep->se_count >= sep->se_max) {
1358 unsigned now = monotonic_sec();
1359 /* did we accumulate se_max connects too quickly? */
1360 if (now - sep->se_time <= CNT_INTERVAL) {
1361 bb_error_msg("%s/%s: too many connections, pausing",
1362 sep->se_service, sep->se_proto);
1363 remove_fd_from_set(sep->se_fd);
1364 close(sep->se_fd);
1365 sep->se_fd = -1;
1366 sep->se_count = 0;
1367 rearm_alarm(); /* will revive it in RETRYTIME sec */
Denis Vlasenko3f165fa2008-03-17 08:29:08 +00001368 restore_sigmask(&omask);
Denys Vlasenko223b9412011-09-11 16:48:21 +02001369 maybe_close(new_udp_fd);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001370 maybe_close(accepted_fd);
1371 continue; /* -> check next fd in fd set */
Denis Vlasenkoc1876d72006-09-23 15:58:01 +00001372 }
Denis Vlasenkoc1876d72006-09-23 15:58:01 +00001373 sep->se_count = 0;
Denis Vlasenkoc1876d72006-09-23 15:58:01 +00001374 }
1375 }
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001376 /* on NOMMU, streamed chargen
1377 * builtin wouldn't work, but it is
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001378 * not allowed on NOMMU (ifdefed out) */
1379#ifdef INETD_BUILTINS_ENABLED
1380 if (BB_MMU && sep->se_builtin)
1381 pid = fork();
1382 else
Denis Vlasenkoc1876d72006-09-23 15:58:01 +00001383#endif
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001384 pid = vfork();
1385
1386 if (pid < 0) { /* fork error */
Pascal Bellard926031b2010-07-04 15:32:38 +02001387 bb_perror_msg("vfork"+1);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001388 sleep(1);
Denis Vlasenko3f165fa2008-03-17 08:29:08 +00001389 restore_sigmask(&omask);
Denys Vlasenko223b9412011-09-11 16:48:21 +02001390 maybe_close(new_udp_fd);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001391 maybe_close(accepted_fd);
1392 continue; /* -> check next fd in fd set */
Denis Vlasenkoc1876d72006-09-23 15:58:01 +00001393 }
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001394 if (pid == 0)
1395 pid--; /* -1: "we did fork and we are child" */
Denis Vlasenkoc1876d72006-09-23 15:58:01 +00001396 }
Denys Vlasenko223b9412011-09-11 16:48:21 +02001397 /* if pid == 0 here, we didn't fork */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001398
1399 if (pid > 0) { /* parent */
1400 if (sep->se_wait) {
Denys Vlasenko223b9412011-09-11 16:48:21 +02001401 /* wait: we passed socket to child,
Denis Vlasenkoaefed942008-03-17 08:35:44 +00001402 * will wait for child to terminate */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001403 sep->se_wait = pid;
1404 remove_fd_from_set(sep->se_fd);
Denis Vlasenkoaefed942008-03-17 08:35:44 +00001405 }
1406 if (new_udp_fd >= 0) {
1407 /* udp nowait: child connected the socket,
1408 * we created and will use new, unconnected one */
1409 xmove_fd(new_udp_fd, sep->se_fd);
Denys Vlasenko223b9412011-09-11 16:48:21 +02001410 dbg("moved new_udp_fd:%d to sep->se_fd:%d\n", new_udp_fd, sep->se_fd);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001411 }
Denis Vlasenko3f165fa2008-03-17 08:29:08 +00001412 restore_sigmask(&omask);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001413 maybe_close(accepted_fd);
1414 continue; /* -> check next fd in fd set */
1415 }
1416
Denys Vlasenko223b9412011-09-11 16:48:21 +02001417 /* we are either child or didn't fork at all */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001418#ifdef INETD_BUILTINS_ENABLED
1419 if (sep->se_builtin) {
Denys Vlasenko223b9412011-09-11 16:48:21 +02001420 if (pid) { /* "pid" is -1: we did fork */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001421 close(sep->se_fd); /* listening socket */
Denys Vlasenko223b9412011-09-11 16:48:21 +02001422 dbg("closed sep->se_fd:%d\n", sep->se_fd);
Denis Vlasenkoa19e6492009-03-11 14:40:00 +00001423 logmode = LOGMODE_NONE; /* make xwrite etc silent */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001424 }
Denis Vlasenko3f165fa2008-03-17 08:29:08 +00001425 restore_sigmask(&omask);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001426 if (sep->se_socktype == SOCK_STREAM)
1427 sep->se_builtin->bi_stream_fn(ctrl, sep);
1428 else
1429 sep->se_builtin->bi_dgram_fn(ctrl, sep);
Denys Vlasenko223b9412011-09-11 16:48:21 +02001430 if (pid) /* we did fork */
Bernhard Reutner-Fischer636a1f82008-05-19 09:29:47 +00001431 _exit(EXIT_FAILURE);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001432 maybe_close(accepted_fd);
1433 continue; /* -> check next fd in fd set */
1434 }
1435#endif
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001436 /* child */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001437 setsid();
Denis Vlasenkoaefed942008-03-17 08:35:44 +00001438 /* "nowait" udp */
1439 if (new_udp_fd >= 0) {
Denys Vlasenko223b9412011-09-11 16:48:21 +02001440 len_and_sockaddr *lsa;
1441 int r;
1442
1443 close(new_udp_fd);
1444 dbg("closed new_udp_fd:%d\n", new_udp_fd);
1445 lsa = xzalloc_lsa(sep->se_family);
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001446 /* peek at the packet and remember peer addr */
Denys Vlasenko223b9412011-09-11 16:48:21 +02001447 r = recvfrom(ctrl, NULL, 0, MSG_PEEK|MSG_DONTWAIT,
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001448 &lsa->u.sa, &lsa->len);
Denis Vlasenkoc6938402008-03-24 02:18:03 +00001449 if (r < 0)
Denis Vlasenkoaefed942008-03-17 08:35:44 +00001450 goto do_exit1;
1451 /* make this socket "connected" to peer addr:
1452 * only packets from this peer will be recv'ed,
1453 * and bare write()/send() will work on it */
1454 connect(ctrl, &lsa->u.sa, lsa->len);
Denys Vlasenko223b9412011-09-11 16:48:21 +02001455 dbg("connected ctrl:%d to remote peer\n", ctrl);
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001456 free(lsa);
1457 }
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001458 /* prepare env and exec program */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001459 pwd = getpwnam(sep->se_user);
1460 if (pwd == NULL) {
Bernhard Reutner-Fischer02a1c6a2008-07-17 15:13:31 +00001461 bb_error_msg("%s: no such %s", sep->se_user, "user");
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001462 goto do_exit1;
1463 }
1464 if (sep->se_group && (grp = getgrnam(sep->se_group)) == NULL) {
Bernhard Reutner-Fischer02a1c6a2008-07-17 15:13:31 +00001465 bb_error_msg("%s: no such %s", sep->se_group, "group");
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001466 goto do_exit1;
1467 }
1468 if (real_uid != 0 && real_uid != pwd->pw_uid) {
1469 /* a user running private inetd */
1470 bb_error_msg("non-root must run services as himself");
1471 goto do_exit1;
1472 }
Denys Vlasenko585541e2011-09-15 18:27:05 +02001473 if (pwd->pw_uid != 0) {
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001474 if (sep->se_group)
1475 pwd->pw_gid = grp->gr_gid;
Denis Vlasenko92305822008-03-20 15:12:58 +00001476 /* initgroups, setgid, setuid: */
1477 change_identity(pwd);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001478 } else if (sep->se_group) {
1479 xsetgid(grp->gr_gid);
1480 setgroups(1, &grp->gr_gid);
1481 }
1482 if (rlim_ofile.rlim_cur != rlim_ofile_cur)
1483 if (setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0)
1484 bb_perror_msg("setrlimit");
Denys Vlasenkocfc21632009-09-04 02:19:46 +02001485
Denys Vlasenko2cc70912009-09-04 03:48:40 +02001486 /* closelog(); - WRONG. we are after vfork,
1487 * this may confuse syslog() internal state.
1488 * Let's hope libc sets syslog fd to CLOEXEC...
Denys Vlasenkocfc21632009-09-04 02:19:46 +02001489 */
Denys Vlasenko0f952c22009-06-05 15:35:36 +02001490 xmove_fd(ctrl, STDIN_FILENO);
1491 xdup2(STDIN_FILENO, STDOUT_FILENO);
Denys Vlasenko223b9412011-09-11 16:48:21 +02001492 dbg("moved ctrl:%d to fd 0,1[,2]\n", ctrl);
Denys Vlasenko0f952c22009-06-05 15:35:36 +02001493 /* manpages of inetd I managed to find either say
1494 * that stderr is also redirected to the network,
1495 * or do not talk about redirection at all (!) */
Denys Vlasenkocfc21632009-09-04 02:19:46 +02001496 if (!sep->se_wait) /* only for usual "tcp nowait" */
1497 xdup2(STDIN_FILENO, STDERR_FILENO);
1498 /* NB: among others, this loop closes listening sockets
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001499 * for nowait stream children */
1500 for (sep2 = serv_list; sep2; sep2 = sep2->se_next)
Denys Vlasenkocfc21632009-09-04 02:19:46 +02001501 if (sep2->se_fd != ctrl)
1502 maybe_close(sep2->se_fd);
Denis Vlasenko8e2cfec2008-03-12 23:19:35 +00001503 sigaction_set(SIGPIPE, &saved_pipe_handler);
Denis Vlasenko3f165fa2008-03-17 08:29:08 +00001504 restore_sigmask(&omask);
Denys Vlasenko223b9412011-09-11 16:48:21 +02001505 dbg("execing:'%s'\n", sep->se_program);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001506 BB_EXECVP(sep->se_program, sep->se_argv);
Denys Vlasenko31c3dad2010-06-27 16:57:55 +02001507 bb_perror_msg("can't execute '%s'", sep->se_program);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001508 do_exit1:
1509 /* eat packet in udp case */
1510 if (sep->se_socktype != SOCK_STREAM)
1511 recv(0, line, LINE_SIZE, MSG_DONTWAIT);
Bernhard Reutner-Fischer636a1f82008-05-19 09:29:47 +00001512 _exit(EXIT_FAILURE);
Denis Vlasenkoc1876d72006-09-23 15:58:01 +00001513 } /* for (sep = servtab...) */
Denis Vlasenkobf0a2012006-12-26 10:42:51 +00001514 } /* for (;;) */
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001515}
Glenn L McGrath06e95652003-02-09 06:51:14 +00001516
Denys Vlasenkod4e4fdb2017-07-03 21:31:16 +02001517#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO \
1518 || ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
1519# if !BB_MMU
Denis Vlasenko02f12f52008-03-29 16:00:52 +00001520static const char *const cat_args[] = { "cat", NULL };
Denys Vlasenkod4e4fdb2017-07-03 21:31:16 +02001521# endif
Denis Vlasenko02f12f52008-03-29 16:00:52 +00001522#endif
1523
Glenn L McGrath06e95652003-02-09 06:51:14 +00001524/*
1525 * Internet services provided internally by inetd:
1526 */
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +00001527#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001528/* Echo service -- echo data back. */
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001529/* ARGSUSED */
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001530static void FAST_FUNC echo_stream(int s, servtab_t *sep UNUSED_PARAM)
Glenn L McGrath06e95652003-02-09 06:51:14 +00001531{
Denys Vlasenkod4e4fdb2017-07-03 21:31:16 +02001532# if BB_MMU
Denis Vlasenkoc1876d72006-09-23 15:58:01 +00001533 while (1) {
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001534 ssize_t sz = safe_read(s, line, LINE_SIZE);
1535 if (sz <= 0)
1536 break;
1537 xwrite(s, line, sz);
Denis Vlasenkoc1876d72006-09-23 15:58:01 +00001538 }
Denys Vlasenkod4e4fdb2017-07-03 21:31:16 +02001539# else
Denis Vlasenko85c24712008-03-17 09:04:04 +00001540 /* We are after vfork here! */
Denis Vlasenko02f12f52008-03-29 16:00:52 +00001541 /* move network socket to stdin/stdout */
Denis Vlasenko85c24712008-03-17 09:04:04 +00001542 xmove_fd(s, STDIN_FILENO);
1543 xdup2(STDIN_FILENO, STDOUT_FILENO);
1544 /* no error messages please... */
Denis Vlasenko02f12f52008-03-29 16:00:52 +00001545 close(STDERR_FILENO);
Bernhard Reutner-Fischer02a1c6a2008-07-17 15:13:31 +00001546 xopen(bb_dev_null, O_WRONLY);
Denis Vlasenko02f12f52008-03-29 16:00:52 +00001547 BB_EXECVP("cat", (char**)cat_args);
Bernhard Reutner-Fischer636a1f82008-05-19 09:29:47 +00001548 /* on failure we return to main, which does exit(EXIT_FAILURE) */
Denys Vlasenkod4e4fdb2017-07-03 21:31:16 +02001549# endif
Glenn L McGrath06e95652003-02-09 06:51:14 +00001550}
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001551static void FAST_FUNC echo_dg(int s, servtab_t *sep)
Glenn L McGrath06e95652003-02-09 06:51:14 +00001552{
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001553 enum { BUFSIZE = 12*1024 }; /* for jumbo sized packets! :) */
1554 char *buf = xmalloc(BUFSIZE); /* too big for stack */
1555 int sz;
1556 len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
Glenn L McGrath06e95652003-02-09 06:51:14 +00001557
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001558 lsa->len = sep->se_lsa->len;
1559 /* dgram builtins are non-forking - DONT BLOCK! */
1560 sz = recvfrom(s, buf, BUFSIZE, MSG_DONTWAIT, &lsa->u.sa, &lsa->len);
1561 if (sz > 0)
1562 sendto(s, buf, sz, 0, &lsa->u.sa, lsa->len);
1563 free(buf);
Glenn L McGrath06e95652003-02-09 06:51:14 +00001564}
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +00001565#endif /* FEATURE_INETD_SUPPORT_BUILTIN_ECHO */
Glenn L McGrath06e95652003-02-09 06:51:14 +00001566
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001567
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +00001568#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
Denis Vlasenko4cb576e2008-11-05 11:36:22 +00001569/* Discard service -- ignore data. */
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001570/* ARGSUSED */
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001571static void FAST_FUNC discard_stream(int s, servtab_t *sep UNUSED_PARAM)
Glenn L McGrath06e95652003-02-09 06:51:14 +00001572{
Denys Vlasenkod4e4fdb2017-07-03 21:31:16 +02001573# if BB_MMU
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001574 while (safe_read(s, line, LINE_SIZE) > 0)
1575 continue;
Denys Vlasenkod4e4fdb2017-07-03 21:31:16 +02001576# else
Denis Vlasenko85c24712008-03-17 09:04:04 +00001577 /* We are after vfork here! */
Denis Vlasenko85c24712008-03-17 09:04:04 +00001578 /* move network socket to stdin */
1579 xmove_fd(s, STDIN_FILENO);
Denis Vlasenko02f12f52008-03-29 16:00:52 +00001580 /* discard output */
1581 close(STDOUT_FILENO);
Bernhard Reutner-Fischer02a1c6a2008-07-17 15:13:31 +00001582 xopen(bb_dev_null, O_WRONLY);
Denis Vlasenko02f12f52008-03-29 16:00:52 +00001583 /* no error messages please... */
1584 xdup2(STDOUT_FILENO, STDERR_FILENO);
1585 BB_EXECVP("cat", (char**)cat_args);
Bernhard Reutner-Fischer636a1f82008-05-19 09:29:47 +00001586 /* on failure we return to main, which does exit(EXIT_FAILURE) */
Denys Vlasenkod4e4fdb2017-07-03 21:31:16 +02001587# endif
Glenn L McGrath06e95652003-02-09 06:51:14 +00001588}
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001589/* ARGSUSED */
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001590static void FAST_FUNC discard_dg(int s, servtab_t *sep UNUSED_PARAM)
Glenn L McGrath06e95652003-02-09 06:51:14 +00001591{
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001592 /* dgram builtins are non-forking - DONT BLOCK! */
1593 recv(s, line, LINE_SIZE, MSG_DONTWAIT);
Glenn L McGrath06e95652003-02-09 06:51:14 +00001594}
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +00001595#endif /* FEATURE_INETD_SUPPORT_BUILTIN_DISCARD */
Glenn L McGrath06e95652003-02-09 06:51:14 +00001596
1597
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +00001598#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
Glenn L McGrath06e95652003-02-09 06:51:14 +00001599#define LINESIZ 72
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001600static void init_ring(void)
Glenn L McGrath06e95652003-02-09 06:51:14 +00001601{
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001602 int i;
Glenn L McGrath06e95652003-02-09 06:51:14 +00001603
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001604 end_ring = ring;
Denys Vlasenko8684cbb2009-11-18 11:34:43 +01001605 for (i = ' '; i < 127; i++)
1606 *end_ring++ = i;
Glenn L McGrath06e95652003-02-09 06:51:14 +00001607}
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001608/* Character generator. MMU arches only. */
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001609/* ARGSUSED */
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001610static void FAST_FUNC chargen_stream(int s, servtab_t *sep UNUSED_PARAM)
Glenn L McGrath06e95652003-02-09 06:51:14 +00001611{
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001612 char *rs;
1613 int len;
1614 char text[LINESIZ + 2];
Glenn L McGrath06e95652003-02-09 06:51:14 +00001615
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001616 if (!end_ring) {
1617 init_ring();
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001618 rs = ring;
1619 }
Glenn L McGrath06e95652003-02-09 06:51:14 +00001620
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001621 text[LINESIZ] = '\r';
1622 text[LINESIZ + 1] = '\n';
Denis Vlasenkoc1876d72006-09-23 15:58:01 +00001623 rs = ring;
1624 for (;;) {
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001625 len = end_ring - rs;
Denis Vlasenkoc1876d72006-09-23 15:58:01 +00001626 if (len >= LINESIZ)
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001627 memmove(text, rs, LINESIZ);
1628 else {
1629 memmove(text, rs, len);
1630 memmove(text + len, ring, LINESIZ - len);
1631 }
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001632 if (++rs == end_ring)
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001633 rs = ring;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001634 xwrite(s, text, sizeof(text));
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001635 }
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001636}
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001637/* ARGSUSED */
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001638static void FAST_FUNC chargen_dg(int s, servtab_t *sep)
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001639{
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001640 int len;
1641 char text[LINESIZ + 2];
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001642 len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
1643
1644 /* Eat UDP packet which started it all */
1645 /* dgram builtins are non-forking - DONT BLOCK! */
1646 lsa->len = sep->se_lsa->len;
1647 if (recvfrom(s, text, sizeof(text), MSG_DONTWAIT, &lsa->u.sa, &lsa->len) < 0)
1648 return;
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001649
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001650 if (!end_ring) {
1651 init_ring();
1652 ring_pos = ring;
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001653 }
1654
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001655 len = end_ring - ring_pos;
Denis Vlasenko512a5452007-09-24 10:41:30 +00001656 if (len >= LINESIZ)
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001657 memmove(text, ring_pos, LINESIZ);
Glenn L McGrath06e95652003-02-09 06:51:14 +00001658 else {
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001659 memmove(text, ring_pos, len);
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001660 memmove(text + len, ring, LINESIZ - len);
Glenn L McGrath06e95652003-02-09 06:51:14 +00001661 }
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001662 if (++ring_pos == end_ring)
1663 ring_pos = ring;
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001664 text[LINESIZ] = '\r';
1665 text[LINESIZ + 1] = '\n';
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001666 sendto(s, text, sizeof(text), 0, &lsa->u.sa, lsa->len);
Glenn L McGrath06e95652003-02-09 06:51:14 +00001667}
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +00001668#endif /* FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN */
Glenn L McGrath06e95652003-02-09 06:51:14 +00001669
1670
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +00001671#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME
Glenn L McGrath06e95652003-02-09 06:51:14 +00001672/*
1673 * Return a machine readable date and time, in the form of the
1674 * number of seconds since midnight, Jan 1, 1900. Since gettimeofday
1675 * returns the number of seconds since midnight, Jan 1, 1970,
1676 * we must add 2208988800 seconds to this figure to make up for
1677 * some seventy years Bell Labs was asleep.
1678 */
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001679static uint32_t machtime(void)
Glenn L McGrath06e95652003-02-09 06:51:14 +00001680{
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001681 struct timeval tv;
Glenn L McGrath06e95652003-02-09 06:51:14 +00001682
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001683 gettimeofday(&tv, NULL);
Denys Vlasenko179e88b2017-01-20 16:03:48 +01001684 return htonl((uint32_t)(tv.tv_sec + 2208988800U));
Glenn L McGrath06e95652003-02-09 06:51:14 +00001685}
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001686/* ARGSUSED */
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001687static void FAST_FUNC machtime_stream(int s, servtab_t *sep UNUSED_PARAM)
Glenn L McGrath06e95652003-02-09 06:51:14 +00001688{
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001689 uint32_t result;
Glenn L McGrath06e95652003-02-09 06:51:14 +00001690
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001691 result = machtime();
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001692 full_write(s, &result, sizeof(result));
Glenn L McGrath06e95652003-02-09 06:51:14 +00001693}
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001694static void FAST_FUNC machtime_dg(int s, servtab_t *sep)
Glenn L McGrath06e95652003-02-09 06:51:14 +00001695{
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001696 uint32_t result;
1697 len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
Glenn L McGrath06e95652003-02-09 06:51:14 +00001698
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001699 lsa->len = sep->se_lsa->len;
1700 if (recvfrom(s, line, LINE_SIZE, MSG_DONTWAIT, &lsa->u.sa, &lsa->len) < 0)
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001701 return;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001702
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001703 result = machtime();
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001704 sendto(s, &result, sizeof(result), 0, &lsa->u.sa, lsa->len);
Glenn L McGrath06e95652003-02-09 06:51:14 +00001705}
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +00001706#endif /* FEATURE_INETD_SUPPORT_BUILTIN_TIME */
Glenn L McGrath06e95652003-02-09 06:51:14 +00001707
1708
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +00001709#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
Glenn L McGrath06e95652003-02-09 06:51:14 +00001710/* Return human-readable time of day */
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001711/* ARGSUSED */
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001712static void FAST_FUNC daytime_stream(int s, servtab_t *sep UNUSED_PARAM)
Glenn L McGrath06e95652003-02-09 06:51:14 +00001713{
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001714 time_t t;
Glenn L McGrath06e95652003-02-09 06:51:14 +00001715
Denys Vlasenko54e95852015-02-18 13:47:27 +01001716 time(&t);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001717 fdprintf(s, "%.24s\r\n", ctime(&t));
Glenn L McGrath06e95652003-02-09 06:51:14 +00001718}
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001719static void FAST_FUNC daytime_dg(int s, servtab_t *sep)
Glenn L McGrath06e95652003-02-09 06:51:14 +00001720{
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001721 time_t t;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001722 len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
1723
1724 lsa->len = sep->se_lsa->len;
1725 if (recvfrom(s, line, LINE_SIZE, MSG_DONTWAIT, &lsa->u.sa, &lsa->len) < 0)
1726 return;
Glenn L McGrath06e95652003-02-09 06:51:14 +00001727
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001728 t = time(NULL);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001729 sprintf(line, "%.24s\r\n", ctime(&t));
1730 sendto(s, line, strlen(line), 0, &lsa->u.sa, lsa->len);
Glenn L McGrath06e95652003-02-09 06:51:14 +00001731}
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +00001732#endif /* FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME */