blob: 0ddfa6b456e54c352d5f1080538c7dc4d9183c61 [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
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000145 * b) other: setgid(primary group as found in passwd)
Glenn L McGrath06e95652003-02-09 06:51:14 +0000146 * initgroups(name, primary group)
"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()
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000152 * b) other: setgid(specified group)
Glenn L McGrath06e95652003-02-09 06:51:14 +0000153 * initgroups(name, specified group)
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000154 * setuid()
Glenn L McGrath06e95652003-02-09 06:51:14 +0000155 */
156
Rob Landleyd921b2e2006-08-03 15:41:12 +0000157#include <syslog.h>
Rob Landley099ed502006-08-28 09:41:49 +0000158#include <sys/un.h>
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000159
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000160#include "libbb.h"
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000161
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +0000162#if ENABLE_FEATURE_INETD_RPC
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000163#include <rpc/rpc.h>
164#include <rpc/pmap_clnt.h>
Glenn L McGrathff6ec8a2004-01-17 02:47:45 +0000165#endif
166
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000167#if !BB_MMU
168/* stream version of chargen is forking but not execing,
169 * can't do that (easily) on NOMMU */
170#undef ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
171#define ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN 0
172#endif
173
Denis Vlasenko5b340832007-05-17 23:02:14 +0000174#define _PATH_INETDPID "/var/run/inetd.pid"
175
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000176#define CNT_INTERVAL 60 /* servers in CNT_INTERVAL sec. */
177#define RETRYTIME 60 /* retry after bind or server fail */
178
179// TODO: explain, or get rid of setrlimit games
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000180
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000181#ifndef RLIMIT_NOFILE
182#define RLIMIT_NOFILE RLIMIT_OFILE
183#endif
184
185#ifndef OPEN_MAX
186#define OPEN_MAX 64
187#endif
Glenn L McGrath06e95652003-02-09 06:51:14 +0000188
189/* Reserve some descriptors, 3 stdio + at least: 1 log, 1 conf. file */
Denis Vlasenkof8138d12007-01-11 23:26:13 +0000190#define FD_MARGIN 8
Glenn L McGrath06e95652003-02-09 06:51:14 +0000191
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000192#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD \
193 || ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO \
194 || ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN \
195 || ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME \
196 || ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
197# define INETD_BUILTINS_ENABLED
Glenn L McGrath06e95652003-02-09 06:51:14 +0000198#endif
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000199
Denis Vlasenko512a5452007-09-24 10:41:30 +0000200typedef struct servtab_t {
Denis Vlasenko39824072007-09-26 10:46:18 +0000201 /* The most frequently referenced one: */
202 int se_fd; /* open descriptor */
203 /* NB: 'biggest fields last' saves on code size (~250 bytes) */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000204 /* [addr:]service socktype proto wait user[:group] prog [args] */
205 char *se_local_hostname; /* addr to listen on */
206 char *se_service; /* "80" or "www" or "mount/2[-3]" */
207 /* socktype is in se_socktype */ /* "stream" "dgram" "raw" "rdm" "seqpacket" */
208 char *se_proto; /* "unix" or "[rpc/]tcp[6]" */
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +0000209#if ENABLE_FEATURE_INETD_RPC
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000210 int se_rpcprog; /* rpc program number */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000211 int se_rpcver_lo; /* rpc program lowest version */
212 int se_rpcver_hi; /* rpc program highest version */
213#define is_rpc_service(sep) ((sep)->se_rpcver_lo != 0)
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000214#else
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000215#define is_rpc_service(sep) 0
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000216#endif
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000217 pid_t se_wait; /* 0:"nowait", 1:"wait", >1:"wait" */
218 /* and waiting for this pid */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000219 socktype_t se_socktype; /* SOCK_STREAM/DGRAM/RDM/... */
220 family_t se_family; /* AF_UNIX/INET[6] */
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000221 /* se_proto_no is used by RPC code only... hmm */
222 smallint se_proto_no; /* IPPROTO_TCP/UDP, n/a for AF_UNIX */
Denis Vlasenko512a5452007-09-24 10:41:30 +0000223 smallint se_checked; /* looked at during merge */
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000224 unsigned se_max; /* allowed instances per minute */
225 unsigned se_count; /* number started since se_time */
226 unsigned se_time; /* whem we started counting */
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000227 char *se_user; /* user name to run as */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000228 char *se_group; /* group name to run as, can be NULL */
229#ifdef INETD_BUILTINS_ENABLED
230 const struct builtin *se_builtin; /* if built-in, description */
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000231#endif
Denis Vlasenko39824072007-09-26 10:46:18 +0000232 struct servtab_t *se_next;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000233 len_and_sockaddr *se_lsa;
234 char *se_program; /* server program */
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000235#define MAXARGV 20
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000236 char *se_argv[MAXARGV + 1]; /* program arguments */
Glenn L McGrath03a06432004-02-18 13:19:58 +0000237} servtab_t;
238
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000239#ifdef INETD_BUILTINS_ENABLED
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000240/* Echo received data */
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +0000241#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000242static void echo_stream(int, servtab_t *);
243static void echo_dg(int, servtab_t *);
Glenn L McGrath06e95652003-02-09 06:51:14 +0000244#endif
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000245/* Internet /dev/null */
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +0000246#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000247static void discard_stream(int, servtab_t *);
248static void discard_dg(int, servtab_t *);
Glenn L McGrath06e95652003-02-09 06:51:14 +0000249#endif
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000250/* Return 32 bit time since 1900 */
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +0000251#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000252static void machtime_stream(int, servtab_t *);
253static void machtime_dg(int, servtab_t *);
Glenn L McGrath06e95652003-02-09 06:51:14 +0000254#endif
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000255/* Return human-readable time */
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +0000256#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000257static void daytime_stream(int, servtab_t *);
258static void daytime_dg(int, servtab_t *);
Glenn L McGrath06e95652003-02-09 06:51:14 +0000259#endif
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000260/* Familiar character generator */
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +0000261#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000262static void chargen_stream(int, servtab_t *);
263static void chargen_dg(int, servtab_t *);
Glenn L McGrath06e95652003-02-09 06:51:14 +0000264#endif
265
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000266struct builtin {
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000267 /* NB: not necessarily NUL terminated */
268 char bi_service7[7]; /* internally provided service name */
269 uint8_t bi_fork; /* 1 if stream fn should run in child */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000270 void (*bi_stream_fn)(int, servtab_t *);
271 void (*bi_dgram_fn)(int, servtab_t *);
272};
273
Bernhard Reutner-Fischera4acf662006-04-10 12:26:47 +0000274static const struct builtin builtins[] = {
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +0000275#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000276 { "echo", 1, echo_stream, echo_dg },
Glenn L McGrath06e95652003-02-09 06:51:14 +0000277#endif
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +0000278#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000279 { "discard", 1, discard_stream, discard_dg },
Glenn L McGrath06e95652003-02-09 06:51:14 +0000280#endif
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +0000281#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000282 { "chargen", 1, chargen_stream, chargen_dg },
Glenn L McGrath06e95652003-02-09 06:51:14 +0000283#endif
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000284#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000285 { "time", 0, machtime_stream, machtime_dg },
286#endif
287#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000288 { "daytime", 0, daytime_stream, daytime_dg },
289#endif
Glenn L McGrath06e95652003-02-09 06:51:14 +0000290};
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000291#endif /* INETD_BUILTINS_ENABLED */
Glenn L McGrath06e95652003-02-09 06:51:14 +0000292
Denis Vlasenko512a5452007-09-24 10:41:30 +0000293struct globals {
294 rlim_t rlim_ofile_cur;
295 struct rlimit rlim_ofile;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000296 servtab_t *serv_list;
Denis Vlasenko512a5452007-09-24 10:41:30 +0000297 int global_queuelen;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000298 int prev_maxsock;
Denis Vlasenko512a5452007-09-24 10:41:30 +0000299 int maxsock;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000300 unsigned max_concurrency;
301 smallint alarm_armed;
302 uid_t real_uid; /* user ID who ran us */
303 unsigned config_lineno;
Denis Vlasenko512a5452007-09-24 10:41:30 +0000304 const char *config_filename;
305 FILE *fconfig;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000306 char *default_local_hostname;
Denis Vlasenko512a5452007-09-24 10:41:30 +0000307#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000308 char *end_ring;
309 char *ring_pos;
Denis Vlasenko512a5452007-09-24 10:41:30 +0000310 char ring[128];
311#endif
312 fd_set allsock;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000313 /* Used in next_line(), and as scratch read buffer */
314 char line[256]; /* _at least_ 256, see LINE_SIZE */
Denis Vlasenko512a5452007-09-24 10:41:30 +0000315};
316#define G (*(struct globals*)&bb_common_bufsiz1)
317enum { LINE_SIZE = COMMON_BUFSIZE - offsetof(struct globals, line) };
318struct BUG_G_too_big {
319 char BUG_G_too_big[sizeof(G) <= COMMON_BUFSIZE ? 1 : -1];
320};
321#define rlim_ofile_cur (G.rlim_ofile_cur )
322#define rlim_ofile (G.rlim_ofile )
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000323#define serv_list (G.serv_list )
Denis Vlasenko512a5452007-09-24 10:41:30 +0000324#define global_queuelen (G.global_queuelen)
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000325#define prev_maxsock (G.prev_maxsock )
Denis Vlasenko512a5452007-09-24 10:41:30 +0000326#define maxsock (G.maxsock )
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000327#define max_concurrency (G.max_concurrency)
328#define alarm_armed (G.alarm_armed )
329#define real_uid (G.real_uid )
330#define config_lineno (G.config_lineno )
Denis Vlasenko512a5452007-09-24 10:41:30 +0000331#define config_filename (G.config_filename)
332#define fconfig (G.fconfig )
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000333#define default_local_hostname (G.default_local_hostname)
334#define first_ps_byte (G.first_ps_byte )
335#define last_ps_byte (G.last_ps_byte )
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000336#define end_ring (G.end_ring )
337#define ring_pos (G.ring_pos )
Denis Vlasenko512a5452007-09-24 10:41:30 +0000338#define ring (G.ring )
339#define allsock (G.allsock )
340#define line (G.line )
341#define INIT_G() do { \
342 rlim_ofile_cur = OPEN_MAX; \
343 global_queuelen = 128; \
344 config_filename = "/etc/inetd.conf"; \
345} while (0)
Glenn L McGrath06e95652003-02-09 06:51:14 +0000346
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000347static void maybe_close(int fd)
Glenn L McGrath06e95652003-02-09 06:51:14 +0000348{
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000349 if (fd >= 0)
350 close(fd);
Glenn L McGrath06e95652003-02-09 06:51:14 +0000351}
352
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000353// TODO: move to libbb?
354static len_and_sockaddr *xzalloc_lsa(int family)
Glenn L McGrathdf7d84c2004-02-22 11:25:13 +0000355{
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000356 len_and_sockaddr *lsa;
357 int sz;
358
359 sz = sizeof(struct sockaddr_in);
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000360 if (family == AF_UNIX)
361 sz = sizeof(struct sockaddr_un);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000362#if ENABLE_FEATURE_IPV6
363 if (family == AF_INET6)
364 sz = sizeof(struct sockaddr_in6);
365#endif
366 lsa = xzalloc(LSA_LEN_SIZE + sz);
367 lsa->len = sz;
368 lsa->u.sa.sa_family = family;
369 return lsa;
Glenn L McGrathdf7d84c2004-02-22 11:25:13 +0000370}
371
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000372static void rearm_alarm(void)
Glenn L McGrath06e95652003-02-09 06:51:14 +0000373{
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000374 if (!alarm_armed) {
375 alarm_armed = 1;
376 alarm(RETRYTIME);
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000377 }
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000378}
379
380static void block_CHLD_HUP_ALRM(sigset_t *m)
381{
382 sigemptyset(m);
383 sigaddset(m, SIGCHLD);
384 sigaddset(m, SIGHUP);
385 sigaddset(m, SIGALRM);
Denis Vlasenko3f165fa2008-03-17 08:29:08 +0000386 sigprocmask(SIG_BLOCK, m, m); /* old sigmask is stored in m */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000387}
388
Denis Vlasenko3f165fa2008-03-17 08:29:08 +0000389static void restore_sigmask(sigset_t *m)
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000390{
Denis Vlasenko3f165fa2008-03-17 08:29:08 +0000391 sigprocmask(SIG_SETMASK, m, NULL);
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000392}
Glenn L McGrath53766c42004-01-18 08:58:06 +0000393
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +0000394#if ENABLE_FEATURE_INETD_RPC
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000395static void register_rpc(servtab_t *sep)
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000396{
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000397 int n;
398 struct sockaddr_in ir_sin;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000399 socklen_t size;
Glenn L McGrath06e95652003-02-09 06:51:14 +0000400
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000401 size = sizeof(ir_sin);
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000402 if (getsockname(sep->se_fd, (struct sockaddr *) &ir_sin, &size) < 0) {
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000403 bb_perror_msg("getsockname");
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000404 return;
405 }
Glenn L McGratheaf5bc02004-01-20 15:32:39 +0000406
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000407 for (n = sep->se_rpcver_lo; n <= sep->se_rpcver_hi; n++) {
408 pmap_unset(sep->se_rpcprog, n);
409 if (!pmap_set(sep->se_rpcprog, n, sep->se_proto_no, ntohs(ir_sin.sin_port)))
410 bb_perror_msg("%s %s: pmap_set(%u,%u,%u,%u)",
411 sep->se_service, sep->se_proto,
412 sep->se_rpcprog, n, sep->se_proto_no, ntohs(ir_sin.sin_port));
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000413 }
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000414}
Glenn L McGrath06e95652003-02-09 06:51:14 +0000415
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000416static void unregister_rpc(servtab_t *sep)
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000417{
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000418 int n;
Glenn L McGratheaf5bc02004-01-20 15:32:39 +0000419
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000420 for (n = sep->se_rpcver_lo; n <= sep->se_rpcver_hi; n++) {
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000421 if (!pmap_unset(sep->se_rpcprog, n))
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000422 bb_perror_msg("pmap_unset(%u,%u)", sep->se_rpcprog, n);
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000423 }
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000424}
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +0000425#endif /* FEATURE_INETD_RPC */
Glenn L McGratheaf5bc02004-01-20 15:32:39 +0000426
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000427static void bump_nofile(void)
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000428{
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000429 enum { FD_CHUNK = 32 };
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000430 struct rlimit rl;
Glenn L McGrath06e95652003-02-09 06:51:14 +0000431
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000432 /* Never fails under Linux (except if you pass it bad arguments) */
433 getrlimit(RLIMIT_NOFILE, &rl);
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000434 rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK);
435 rl.rlim_cur = MIN(FD_SETSIZE, rl.rlim_cur + FD_CHUNK);
436 if (rl.rlim_cur <= rlim_ofile_cur) {
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000437 bb_error_msg("can't extend file limit, max = %d",
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000438 (int) rl.rlim_cur);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000439 return;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000440 }
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000441
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000442 if (setrlimit(RLIMIT_NOFILE, &rl) < 0) {
443 bb_perror_msg("setrlimit");
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000444 return;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000445 }
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000446
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000447 rlim_ofile_cur = rl.rlim_cur;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000448}
449
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000450static void remove_fd_from_set(int fd)
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000451{
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000452 if (fd >= 0) {
453 FD_CLR(fd, &allsock);
454 maxsock = -1;
455 }
456}
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000457
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000458static void add_fd_to_set(int fd)
459{
460 if (fd >= 0) {
461 FD_SET(fd, &allsock);
462 if (maxsock >= 0 && fd > maxsock) {
463 prev_maxsock = maxsock = fd;
464 if ((rlim_t)maxsock > rlim_ofile_cur - FD_MARGIN)
465 bump_nofile();
466 }
467 }
468}
469
470static void recalculate_maxsock(void)
471{
472 int fd = 0;
473 while (fd <= prev_maxsock) {
474 if (FD_ISSET(fd, &allsock))
475 maxsock = fd;
476 fd++;
477 }
478 prev_maxsock = maxsock;
479 if ((rlim_t)maxsock > rlim_ofile_cur - FD_MARGIN)
480 bump_nofile();
481}
482
483static void prepare_socket_fd(servtab_t *sep)
484{
485 int r, fd;
486
487 fd = socket(sep->se_family, sep->se_socktype, 0);
488 if (fd < 0) {
489 bb_perror_msg("socket");
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000490 return;
491 }
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000492 setsockopt_reuseaddr(fd);
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000493
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +0000494#if ENABLE_FEATURE_INETD_RPC
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000495 if (is_rpc_service(sep)) {
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000496 struct passwd *pwd;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000497
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000498 /* zero out the port for all RPC services; let bind()
499 * find one. */
500 set_nport(sep->se_lsa, 0);
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000501
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000502 /* for RPC services, attempt to use a reserved port
503 * if they are going to be running as root. */
504 if (real_uid == 0 && sep->se_family == AF_INET
505 && (pwd = getpwnam(sep->se_user)) != NULL
506 && pwd->pw_uid == 0
507 ) {
508 r = bindresvport(fd, &sep->se_lsa->u.sin);
509 } else {
510 r = bind(fd, &sep->se_lsa->u.sa, sep->se_lsa->len);
511 }
512 if (r == 0) {
513 int saveerrno = errno;
514 /* update lsa with port# */
515 getsockname(fd, &sep->se_lsa->u.sa, &sep->se_lsa->len);
516 errno = saveerrno;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000517 }
518 } else
Glenn L McGrath53766c42004-01-18 08:58:06 +0000519#endif
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000520 {
521 if (sep->se_family == AF_UNIX) {
522 struct sockaddr_un *sun;
523 sun = (struct sockaddr_un*)&(sep->se_lsa->u.sa);
524 unlink(sun->sun_path);
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000525 }
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000526 r = bind(fd, &sep->se_lsa->u.sa, sep->se_lsa->len);
527 }
528 if (r < 0) {
529 bb_perror_msg("%s/%s: bind",
530 sep->se_service, sep->se_proto);
531 close(fd);
532 rearm_alarm();
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000533 return;
Glenn L McGrath53766c42004-01-18 08:58:06 +0000534 }
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000535 if (sep->se_socktype == SOCK_STREAM)
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000536 listen(fd, global_queuelen);
Glenn L McGrath53766c42004-01-18 08:58:06 +0000537
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000538 add_fd_to_set(fd);
539 sep->se_fd = fd;
540}
541
542static int reopen_config_file(void)
543{
544 free(default_local_hostname);
545 default_local_hostname = xstrdup("*");
546 if (fconfig != NULL)
547 fclose(fconfig);
548 config_lineno = 0;
549 fconfig = fopen_or_warn(config_filename, "r");
550 return (fconfig != NULL);
551}
552
553static void close_config_file(void)
554{
555 if (fconfig) {
556 fclose(fconfig);
557 fconfig = NULL;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000558 }
Glenn L McGrath06e95652003-02-09 06:51:14 +0000559}
560
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000561static char *next_line(void)
Glenn L McGrath06e95652003-02-09 06:51:14 +0000562{
Denis Vlasenko6df9e3c2007-11-12 21:21:35 +0000563 if (fgets(line, LINE_SIZE, fconfig) == NULL)
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000564 return NULL;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000565 config_lineno++;
Denis Vlasenkoc03e8722007-12-26 20:56:55 +0000566 *strchrnul(line, '\n') = '\0';
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000567 return line;
Glenn L McGrath06e95652003-02-09 06:51:14 +0000568}
569
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000570static char *next_word(char **cpp)
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000571{
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000572 char *start;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000573 char *cp = *cpp;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000574
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000575 if (cp == NULL)
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000576 return NULL;
Denis Vlasenkoce074df2007-03-24 12:07:31 +0000577 again:
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000578 while (*cp == ' ' || *cp == '\t')
579 cp++;
580 if (*cp == '\0') {
Denis Vlasenko6df9e3c2007-11-12 21:21:35 +0000581 int c = getc(fconfig);
Denis Vlasenko55f30b02007-03-24 22:42:29 +0000582 ungetc(c, fconfig);
583 if (c == ' ' || c == '\t') {
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000584 cp = next_line();
Denis Vlasenko55f30b02007-03-24 22:42:29 +0000585 if (cp)
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000586 goto again;
Denis Vlasenko55f30b02007-03-24 22:42:29 +0000587 }
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000588 *cpp = NULL;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000589 return NULL;
590 }
591 start = cp;
592 while (*cp && *cp != ' ' && *cp != '\t')
593 cp++;
594 if (*cp != '\0')
595 *cp++ = '\0';
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000596
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000597 *cpp = cp;
598 return start;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000599}
600
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000601static void free_servtab_strings(servtab_t *cp)
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000602{
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000603 int i;
604
605 free(cp->se_local_hostname);
606 free(cp->se_service);
607 free(cp->se_proto);
608 free(cp->se_user);
609 free(cp->se_group);
610 free(cp->se_lsa); /* not a string in fact */
611 free(cp->se_program);
612 for (i = 0; i < MAXARGV; i++)
613 free(cp->se_argv[i]);
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000614}
615
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000616static servtab_t *new_servtab(void)
617{
618 servtab_t *newtab = xzalloc(sizeof(servtab_t));
619 newtab->se_fd = -1; /* paranoia */
620 return newtab;
621}
622
623static servtab_t *dup_servtab(servtab_t *sep)
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000624{
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000625 servtab_t *newtab;
626 int argc;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000627
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000628 newtab = new_servtab();
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000629 *newtab = *sep; /* struct copy */
630 /* deep-copying strings */
631 newtab->se_service = xstrdup(newtab->se_service);
632 newtab->se_proto = xstrdup(newtab->se_proto);
633 newtab->se_user = xstrdup(newtab->se_user);
634 newtab->se_group = xstrdup(newtab->se_group);
635 newtab->se_program = xstrdup(newtab->se_program);
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000636 for (argc = 0; argc <= MAXARGV; argc++)
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000637 newtab->se_argv[argc] = xstrdup(newtab->se_argv[argc]);
638 /* NB: se_fd, se_hostaddr and se_next are always
639 * overwrittend by callers, so we don't bother resetting them
640 * to NULL/0/-1 etc */
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000641
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000642 return newtab;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000643}
644
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000645/* gcc generates much more code if this is inlined */
646static NOINLINE servtab_t *parse_one_line(void)
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000647{
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000648 int argc;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000649 char *p, *cp, *arg;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000650 char *hostdelim;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000651 servtab_t *sep;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000652 servtab_t *nsep;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000653 new:
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000654 sep = new_servtab();
Denis Vlasenko13858992006-10-08 12:49:22 +0000655 more:
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000656 while ((cp = next_line()) && *cp == '#')
Denis Vlasenko6df9e3c2007-11-12 21:21:35 +0000657 continue; /* skip comment lines */
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000658 if (cp == NULL) {
Denis Vlasenko6df9e3c2007-11-12 21:21:35 +0000659 free(sep);
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000660 return NULL;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000661 }
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000662
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000663 arg = next_word(&cp);
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000664 if (arg == NULL) /* a blank line. */
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000665 goto more;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000666
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000667 /* [host:]service socktype proto wait user[:group] prog [args] */
668 /* Check for "host:...." line */
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000669 hostdelim = strrchr(arg, ':');
670 if (hostdelim) {
671 *hostdelim = '\0';
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000672 sep->se_local_hostname = xstrdup(arg);
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000673 arg = hostdelim + 1;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000674 if (*arg == '\0') {
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000675 arg = next_word(&cp);
676 if (arg == NULL) {
677 /* Line has just "host:", change the
678 * default host for the following lines. */
679 free(default_local_hostname);
680 default_local_hostname = sep->se_local_hostname;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000681 goto more;
682 }
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000683 }
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000684 } else
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000685 sep->se_local_hostname = xstrdup(default_local_hostname);
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000686
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000687 /* service socktype proto wait user[:group] prog [args] */
688 sep->se_service = xstrdup(arg);
689 /* socktype proto wait user[:group] prog [args] */
690 arg = next_word(&cp);
691 if (arg == NULL) {
692 parse_err:
693 bb_error_msg("parse error on line %u, line is ignored",
694 config_lineno);
695 free_servtab_strings(sep);
696 /* Just "goto more" can make sep to carry over e.g.
697 * "rpc"-ness (by having se_rpcver_lo != 0).
698 * We will be more paranoid: */
699 free(sep);
700 goto new;
701 }
Denis Vlasenko9d1afdb2007-10-30 19:54:39 +0000702 {
703 static int8_t SOCK_xxx[] ALIGN1 = {
704 -1,
705 SOCK_STREAM, SOCK_DGRAM, SOCK_RDM,
706 SOCK_SEQPACKET, SOCK_RAW
707 };
708 sep->se_socktype = SOCK_xxx[1 + index_in_strings(
709 "stream""\0" "dgram""\0" "rdm""\0"
710 "seqpacket""\0" "raw""\0"
711 , arg)];
712 }
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000713
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000714 /* {unix,[rpc/]{tcp,udp}[6]} wait user[:group] prog [args] */
715 sep->se_proto = arg = xstrdup(next_word(&cp));
716 if (arg == NULL)
717 goto parse_err;
718 if (strcmp(arg, "unix") == 0) {
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000719 sep->se_family = AF_UNIX;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000720 } else {
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000721 char *six;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000722 sep->se_family = AF_INET;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000723 six = last_char_is(arg, '6');
724 if (six) {
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +0000725#if ENABLE_FEATURE_IPV6
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000726 *six = '\0';
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000727 sep->se_family = AF_INET6;
728#else
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000729 bb_error_msg("%s: no support for IPv6", sep->se_proto);
730 goto parse_err;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000731#endif
732 }
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000733 if (strncmp(arg, "rpc/", 4) == 0) {
734#if ENABLE_FEATURE_INETD_RPC
735 unsigned n;
736 arg += 4;
737 p = strchr(sep->se_service, '/');
738 if (p == NULL) {
739 bb_error_msg("no rpc version: '%s'", sep->se_service);
740 goto parse_err;
741 }
742 *p++ = '\0';
743 n = bb_strtou(p, &p, 10);
744 if (n > INT_MAX) {
745 bad_ver_spec:
746 bb_error_msg("bad rpc version");
747 goto parse_err;
748 }
749 sep->se_rpcver_lo = sep->se_rpcver_hi = n;
750 if (*p == '-') {
751 p++;
752 n = bb_strtou(p, &p, 10);
753 if (n > INT_MAX || n < sep->se_rpcver_lo)
754 goto bad_ver_spec;
755 sep->se_rpcver_hi = n;
756 }
757 if (*p != '\0')
758 goto bad_ver_spec;
759#else
760 bb_error_msg("no support for rpc services");
761 goto parse_err;
762#endif
763 }
764 /* we don't really need getprotobyname()! */
765 if (strcmp(arg, "tcp") == 0)
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000766 sep->se_proto_no = IPPROTO_TCP; /* = 6 */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000767 if (strcmp(arg, "udp") == 0)
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000768 sep->se_proto_no = IPPROTO_UDP; /* = 17 */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000769 if (six)
770 *six = '6';
771 if (!sep->se_proto_no) /* not tcp/udp?? */
772 goto parse_err;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000773 }
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000774
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000775 /* [no]wait[.max] user[:group] prog [args] */
776 arg = next_word(&cp);
777 if (arg == NULL)
778 goto parse_err;
779 sep->se_max = max_concurrency;
780 p = strchr(arg, '.');
781 if (p) {
782 *p++ = '\0';
783 sep->se_max = bb_strtou(p, NULL, 10);
784 if (errno)
785 goto parse_err;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000786 }
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000787 sep->se_wait = (arg[0] != 'n' || arg[1] != 'o');
788 if (!sep->se_wait) /* "no" seen */
789 arg += 2;
790 if (strcmp(arg, "wait") != 0)
791 goto parse_err;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000792
793 /* user[:group] prog [args] */
794 sep->se_user = xstrdup(next_word(&cp));
795 if (sep->se_user == NULL)
796 goto parse_err;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000797 arg = strchr(sep->se_user, '.');
798 if (arg == NULL)
799 arg = strchr(sep->se_user, ':');
800 if (arg) {
801 *arg++ = '\0';
802 sep->se_group = xstrdup(arg);
803 }
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000804
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000805 /* prog [args] */
806 sep->se_program = xstrdup(next_word(&cp));
807 if (sep->se_program == NULL)
808 goto parse_err;
809#ifdef INETD_BUILTINS_ENABLED
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000810 if (strcmp(sep->se_program, "internal") == 0
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000811 && strlen(sep->se_service) <= 7
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000812 && (sep->se_socktype == SOCK_STREAM
813 || sep->se_socktype == SOCK_DGRAM)
814 ) {
815 int i;
816 for (i = 0; i < ARRAY_SIZE(builtins); i++)
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000817 if (strncmp(builtins[i].bi_service7, sep->se_service, 7) == 0)
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000818 goto found_bi;
819 bb_error_msg("unknown internal service %s", sep->se_service);
820 goto parse_err;
821 found_bi:
822 sep->se_builtin = &builtins[i];
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000823 /* stream builtins must be "nowait", dgram must be "wait" */
824 if (sep->se_wait != (sep->se_socktype == SOCK_DGRAM))
825 goto parse_err;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000826 }
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000827#endif
828 argc = 0;
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000829 while ((arg = next_word(&cp)) != NULL && argc < MAXARGV)
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000830 sep->se_argv[argc++] = xstrdup(arg);
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000831
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000832 /* catch mixups. "<service> stream udp ..." == wtf */
833 if (sep->se_socktype == SOCK_STREAM) {
834 if (sep->se_proto_no == IPPROTO_UDP)
835 goto parse_err;
836 }
837 if (sep->se_socktype == SOCK_DGRAM) {
838 if (sep->se_proto_no == IPPROTO_TCP)
839 goto parse_err;
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000840 }
841
842 /* check if the hostname specifier is a comma separated list
843 * of hostnames. we'll make new entries for each address. */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000844 while ((hostdelim = strrchr(sep->se_local_hostname, ',')) != NULL) {
845 nsep = dup_servtab(sep);
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000846 /* NUL terminate the hostname field of the existing entry,
847 * and make a dup for the new entry. */
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000848 *hostdelim++ = '\0';
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000849 nsep->se_local_hostname = xstrdup(hostdelim);
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000850 nsep->se_next = sep->se_next;
851 sep->se_next = nsep;
852 }
853
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000854 /* was doing it here: */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000855 /* DNS resolution, create copies for each IP address */
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000856 /* IPv6-ization destroyed it :( */
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000857
858 return sep;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000859}
860
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000861static servtab_t *insert_in_servlist(servtab_t *cp)
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000862{
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000863 servtab_t *sep;
864 sigset_t omask;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000865
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000866 sep = new_servtab();
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000867 *sep = *cp; /* struct copy */
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000868 sep->se_fd = -1;
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +0000869#if ENABLE_FEATURE_INETD_RPC
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000870 sep->se_rpcprog = -1;
871#endif
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000872 block_CHLD_HUP_ALRM(&omask);
873 sep->se_next = serv_list;
874 serv_list = sep;
Denis Vlasenko3f165fa2008-03-17 08:29:08 +0000875 restore_sigmask(&omask);
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000876 return sep;
877}
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000878
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000879static int same_serv_addr_proto(servtab_t *old, servtab_t *new)
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000880{
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000881 if (strcmp(old->se_local_hostname, new->se_local_hostname) != 0)
882 return 0;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000883 if (strcmp(old->se_service, new->se_service) != 0)
884 return 0;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000885 if (strcmp(old->se_proto, new->se_proto) != 0)
886 return 0;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000887 return 1;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000888}
889
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000890static void reread_config_file(int sig ATTRIBUTE_UNUSED)
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000891{
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000892 servtab_t *sep, *cp, **sepp;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000893 len_and_sockaddr *lsa;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000894 sigset_t omask;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000895 unsigned n;
896 uint16_t port;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000897
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000898 if (!reopen_config_file())
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000899 return;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000900 for (sep = serv_list; sep; sep = sep->se_next)
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000901 sep->se_checked = 0;
Bernhard Reutner-Fischerd591a362006-08-20 17:35:13 +0000902
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000903 goto first_line;
904 while (1) {
905 if (cp == NULL) {
906 first_line:
907 cp = parse_one_line();
908 if (cp == NULL)
909 break;
910 }
911 for (sep = serv_list; sep; sep = sep->se_next)
912 if (same_serv_addr_proto(sep, cp))
913 goto equal_servtab;
914 /* not an "equal" servtab */
915 sep = insert_in_servlist(cp);
916 goto after_check;
917 equal_servtab:
918 {
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000919 int i;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000920
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000921 block_CHLD_HUP_ALRM(&omask);
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +0000922#if ENABLE_FEATURE_INETD_RPC
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000923 if (is_rpc_service(sep))
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000924 unregister_rpc(sep);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000925 sep->se_rpcver_lo = cp->se_rpcver_lo;
926 sep->se_rpcver_hi = cp->se_rpcver_hi;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000927#endif
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000928 if (cp->se_wait == 0) {
929 /* New config says "nowait". If old one
930 * was "wait", we currently may be waiting
931 * for a child (and not accepting connects).
932 * Stop waiting, start listening again.
933 * (if it's not true, this op is harmless) */
934 add_fd_to_set(sep->se_fd);
935 }
936 sep->se_wait = cp->se_wait;
937 sep->se_max = cp->se_max;
938 /* string fields need more love - we don't want to leak them */
939#define SWAP(type, a, b) do { type c = (type)a; a = (type)b; b = (type)c; } while (0)
940 SWAP(char*, sep->se_user, cp->se_user);
941 SWAP(char*, sep->se_group, cp->se_group);
942 SWAP(char*, sep->se_program, cp->se_program);
943 for (i = 0; i < MAXARGV; i++)
944 SWAP(char*, sep->se_argv[i], cp->se_argv[i]);
945#undef SWAP
Denis Vlasenko3f165fa2008-03-17 08:29:08 +0000946 restore_sigmask(&omask);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000947 free_servtab_strings(cp);
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000948 }
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000949 after_check:
950 /* cp->string_fields are consumed by insert_in_servlist()
951 * or freed at this point, cp itself is not yet freed. */
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000952 sep->se_checked = 1;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000953
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000954 /* create new len_and_sockaddr */
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000955 switch (sep->se_family) {
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000956 struct sockaddr_un *sun;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000957 case AF_UNIX:
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000958 lsa = xzalloc_lsa(AF_UNIX);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000959 sun = (struct sockaddr_un*)&lsa->u.sa;
Denis Vlasenko4cf1d082008-03-12 23:13:50 +0000960 safe_strncpy(sun->sun_path, sep->se_service, sizeof(sun->sun_path));
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000961 break;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000962
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000963 default: /* case AF_INET, case AF_INET6 */
964 n = bb_strtou(sep->se_service, NULL, 10);
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +0000965#if ENABLE_FEATURE_INETD_RPC
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000966 if (is_rpc_service(sep)) {
967 sep->se_rpcprog = n;
968 if (errno) { /* se_service is not numeric */
969 struct rpcent *rp = getrpcbyname(sep->se_service);
970 if (rp == NULL) {
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000971 bb_error_msg("%s: unknown rpc service", sep->se_service);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000972 goto next_cp;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000973 }
974 sep->se_rpcprog = rp->r_number;
975 }
976 if (sep->se_fd == -1)
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000977 prepare_socket_fd(sep);
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000978 if (sep->se_fd != -1)
979 register_rpc(sep);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000980 goto next_cp;
981 }
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +0000982#endif
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000983 /* what port to listen on? */
984 port = htons(n);
985 if (errno || n > 0xffff) { /* se_service is not numeric */
986 char protoname[4];
987 struct servent *sp;
988 /* can result only in "tcp" or "udp": */
989 safe_strncpy(protoname, sep->se_proto, 4);
990 sp = getservbyname(sep->se_service, protoname);
991 if (sp == NULL) {
992 bb_error_msg("%s/%s: unknown service",
993 sep->se_service, sep->se_proto);
994 goto next_cp;
Denis Vlasenkoec17d432006-09-23 15:18:38 +0000995 }
Denis Vlasenko4e6d5112008-03-12 22:14:34 +0000996 port = sp->s_port;
997 }
998 if (LONE_CHAR(sep->se_local_hostname, '*')) {
999 lsa = xzalloc_lsa(sep->se_family);
1000 set_nport(lsa, port);
1001 } else {
1002 lsa = host_and_af2sockaddr(sep->se_local_hostname,
1003 ntohs(port), sep->se_family);
1004 if (!lsa) {
1005 bb_error_msg("%s/%s: unknown host '%s'",
1006 sep->se_service, sep->se_proto,
1007 sep->se_local_hostname);
1008 goto next_cp;
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001009 }
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001010 }
1011 break;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001012 } /* end of "switch (sep->se_family)" */
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001013
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001014 /* did lsa change? Then close/open */
1015 if (sep->se_lsa == NULL
1016 || lsa->len != sep->se_lsa->len
1017 || memcmp(&lsa->u.sa, &sep->se_lsa->u.sa, lsa->len) != 0
1018 ) {
1019 remove_fd_from_set(sep->se_fd);
1020 maybe_close(sep->se_fd);
1021 free(sep->se_lsa);
1022 sep->se_lsa = lsa;
1023 sep->se_fd = -1;
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001024 } else {
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001025 free(lsa);
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001026 }
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001027 if (sep->se_fd == -1)
1028 prepare_socket_fd(sep);
1029 next_cp:
1030 sep = cp->se_next;
1031 free(cp);
1032 cp = sep;
1033 } /* end of "while (1) parse lines" */
1034 close_config_file();
1035
1036 /* Purge anything not looked at above - these are stale entries,
1037 * new config file doesnt have them. */
1038 block_CHLD_HUP_ALRM(&omask);
1039 sepp = &serv_list;
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001040 while ((sep = *sepp)) {
1041 if (sep->se_checked) {
1042 sepp = &sep->se_next;
1043 continue;
1044 }
1045 *sepp = sep->se_next;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001046 remove_fd_from_set(sep->se_fd);
1047 maybe_close(sep->se_fd);
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +00001048#if ENABLE_FEATURE_INETD_RPC
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001049 if (is_rpc_service(sep))
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001050 unregister_rpc(sep);
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001051#endif
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001052 if (sep->se_family == AF_UNIX)
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001053 unlink(sep->se_service);
1054 free_servtab_strings(sep);
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001055 free(sep);
1056 }
Denis Vlasenko3f165fa2008-03-17 08:29:08 +00001057 restore_sigmask(&omask);
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001058}
1059
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001060static void reap_child(int sig ATTRIBUTE_UNUSED)
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001061{
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001062 pid_t pid;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001063 int status;
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001064 servtab_t *sep;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001065 int save_errno = errno;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001066
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001067 for (;;) {
Denis Vlasenkofb0eba72008-01-02 19:55:04 +00001068 pid = wait_any_nohang(&status);
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001069 if (pid <= 0)
1070 break;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001071 for (sep = serv_list; sep; sep = sep->se_next)
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001072 if (sep->se_wait == pid) {
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001073 /* One of our "wait" services */
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001074 if (WIFEXITED(status) && WEXITSTATUS(status))
1075 bb_error_msg("%s: exit status 0x%x",
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001076 sep->se_program, WEXITSTATUS(status));
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001077 else if (WIFSIGNALED(status))
1078 bb_error_msg("%s: exit signal 0x%x",
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001079 sep->se_program, WTERMSIG(status));
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001080 sep->se_wait = 1;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001081 add_fd_to_set(sep->se_fd);
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001082 }
1083 }
1084 errno = save_errno;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001085}
1086
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001087static void retry_network_setup(int sig ATTRIBUTE_UNUSED)
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001088{
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001089 servtab_t *sep;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001090
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001091 alarm_armed = 0;
1092 for (sep = serv_list; sep; sep = sep->se_next) {
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001093 if (sep->se_fd == -1) {
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001094 prepare_socket_fd(sep);
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +00001095#if ENABLE_FEATURE_INETD_RPC
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001096 if (sep->se_fd != -1 && is_rpc_service(sep))
1097 register_rpc(sep);
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001098#endif
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001099 }
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001100 }
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001101}
1102
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001103static void clean_up_and_exit(int sig ATTRIBUTE_UNUSED)
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001104{
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001105 servtab_t *sep;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001106
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001107 /* XXX signal race walking sep list */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001108 for (sep = serv_list; sep; sep = sep->se_next) {
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001109 if (sep->se_fd == -1)
1110 continue;
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001111
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001112 switch (sep->se_family) {
1113 case AF_UNIX:
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001114 unlink(sep->se_service);
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001115 break;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001116 default: /* case AF_INET, AF_INET6 */
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +00001117#if ENABLE_FEATURE_INETD_RPC
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001118 if (sep->se_wait == 1 && is_rpc_service(sep))
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001119 unregister_rpc(sep); /* XXX signal race */
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001120#endif
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001121 break;
1122 }
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001123 if (ENABLE_FEATURE_CLEAN_UP)
1124 close(sep->se_fd);
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001125 }
Denis Vlasenko10457b92007-03-27 22:01:31 +00001126 remove_pidfile(_PATH_INETDPID);
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001127 exit(0);
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001128}
1129
Denis Vlasenko9b49a5e2007-10-11 10:05:36 +00001130int inetd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
Denis Vlasenko68404f12008-03-17 09:00:54 +00001131int inetd_main(int argc ATTRIBUTE_UNUSED, char **argv)
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001132{
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001133 struct sigaction sa, saved_pipe_handler;
1134 servtab_t *sep, *sep2;
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001135 struct passwd *pwd;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001136 struct group *grp = grp; /* for compiler */
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001137 int opt;
1138 pid_t pid;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001139 sigset_t omask;
Denis Vlasenko512a5452007-09-24 10:41:30 +00001140
1141 INIT_G();
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001142
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001143 real_uid = getuid();
1144 if (real_uid != 0) /* run by non-root user */
Denis Vlasenko55f30b02007-03-24 22:42:29 +00001145 config_filename = NULL;
Denis Vlasenko5a142022007-03-26 13:20:54 +00001146
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001147 opt_complementary = "R+:q+"; /* -q N, -R N */
1148 opt = getopt32(argv, "R:feq:", &max_concurrency, &global_queuelen);
Denis Vlasenko5a142022007-03-26 13:20:54 +00001149 argv += optind;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001150 //argc -= optind;
1151 if (argv[0])
Denis Vlasenko55f30b02007-03-24 22:42:29 +00001152 config_filename = argv[0];
1153 if (config_filename == NULL)
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001154 bb_error_msg_and_die("non-root must specify config file");
Denis Vlasenko5a142022007-03-26 13:20:54 +00001155 if (!(opt & 2))
1156 bb_daemonize_or_rexec(0, argv - optind);
1157 else
1158 bb_sanitize_stdio();
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001159 if (!(opt & 4)) {
1160 openlog(applet_name, LOG_PID | LOG_NOWAIT, LOG_DAEMON);
1161 logmode = LOGMODE_SYSLOG;
1162 }
Eric Andersen35e643b2003-07-28 07:40:39 +00001163
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001164 if (real_uid == 0) {
1165 /* run by root, ensure groups vector gets trashed */
Denis Vlasenko7a431b32007-01-14 01:29:06 +00001166 gid_t gid = getgid();
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001167 setgroups(1, &gid);
1168 }
1169
Denis Vlasenko10457b92007-03-27 22:01:31 +00001170 write_pidfile(_PATH_INETDPID);
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001171
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001172 /* never fails under Linux (except if you pass it bad arguments) */
1173 getrlimit(RLIMIT_NOFILE, &rlim_ofile);
1174 rlim_ofile_cur = rlim_ofile.rlim_cur;
1175 if (rlim_ofile_cur == RLIM_INFINITY) /* ! */
1176 rlim_ofile_cur = OPEN_MAX;
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001177
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001178 memset(&sa, 0, sizeof(sa));
Denis Vlasenko400d8bb2008-02-24 13:36:01 +00001179 /*sigemptyset(&sa.sa_mask); - memset did it */
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001180 sigaddset(&sa.sa_mask, SIGALRM);
1181 sigaddset(&sa.sa_mask, SIGCHLD);
1182 sigaddset(&sa.sa_mask, SIGHUP);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001183 sa.sa_handler = retry_network_setup;
Denis Vlasenko8e2cfec2008-03-12 23:19:35 +00001184 sigaction_set(SIGALRM, &sa);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001185 sa.sa_handler = reread_config_file;
Denis Vlasenko8e2cfec2008-03-12 23:19:35 +00001186 sigaction_set(SIGHUP, &sa);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001187 sa.sa_handler = reap_child;
Denis Vlasenko8e2cfec2008-03-12 23:19:35 +00001188 sigaction_set(SIGCHLD, &sa);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001189 sa.sa_handler = clean_up_and_exit;
Denis Vlasenko8e2cfec2008-03-12 23:19:35 +00001190 sigaction_set(SIGTERM, &sa);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001191 sa.sa_handler = clean_up_and_exit;
Denis Vlasenko8e2cfec2008-03-12 23:19:35 +00001192 sigaction_set(SIGINT, &sa);
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001193 sa.sa_handler = SIG_IGN;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001194 sigaction(SIGPIPE, &sa, &saved_pipe_handler);
Glenn L McGrath06e95652003-02-09 06:51:14 +00001195
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001196 reread_config_file(SIGHUP); /* load config from file */
Glenn L McGrath06e95652003-02-09 06:51:14 +00001197
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001198 for (;;) {
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001199 int ready_fd_cnt;
Denis Vlasenkoaefed942008-03-17 08:35:44 +00001200 int ctrl, accepted_fd, new_udp_fd;
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001201 fd_set readable;
1202
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001203 if (maxsock < 0)
1204 recalculate_maxsock();
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001205
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001206 readable = allsock; /* struct copy */
1207 /* if there are no fds to wait on, we will block
1208 * until signal wakes us up */
1209 ready_fd_cnt = select(maxsock + 1, &readable, NULL, NULL, NULL);
1210 if (ready_fd_cnt < 0) {
1211 if (errno != EINTR) {
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001212 bb_perror_msg("select");
1213 sleep(1);
1214 }
Glenn L McGrath82d42db2004-02-18 13:12:53 +00001215 continue;
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001216 }
Denis Vlasenkoc1876d72006-09-23 15:58:01 +00001217
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001218 for (sep = serv_list; ready_fd_cnt && sep; sep = sep->se_next) {
Denis Vlasenkoc1876d72006-09-23 15:58:01 +00001219 if (sep->se_fd == -1 || !FD_ISSET(sep->se_fd, &readable))
1220 continue;
1221
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001222 ready_fd_cnt--;
1223 ctrl = sep->se_fd;
1224 accepted_fd = -1;
Denis Vlasenkoaefed942008-03-17 08:35:44 +00001225 new_udp_fd = -1;
1226 if (!sep->se_wait) {
1227 if (sep->se_socktype == SOCK_STREAM) {
1228 ctrl = accepted_fd = accept(sep->se_fd, NULL, NULL);
1229 if (ctrl < 0) {
1230 if (errno != EINTR)
1231 bb_perror_msg("accept (for %s)", sep->se_service);
1232 continue;
1233 }
1234 }
1235 /* "nowait" udp */
1236 if (sep->se_socktype == SOCK_DGRAM
1237 && sep->se_family != AF_UNIX
1238 ) {
1239/* How udp "nowait" works:
1240 * child peeks at (received and buffered by kernel) UDP packet,
1241 * performs connect() on the socket so that it is linked only
1242 * to this peer. But this also affects parent, because descriptors
1243 * are shared after fork() a-la dup(). When parent performs
1244 * select(), it will see this descriptor connected to the peer (!)
1245 * and still readable, will act on it and mess things up
1246 * (can create many copies of same child, etc).
1247 * Parent must create and use new socket instead. */
1248 new_udp_fd = socket(sep->se_family, SOCK_DGRAM, 0);
1249 if (new_udp_fd < 0) { /* error: eat packet, forget about it */
1250 udp_err:
1251 recv(sep->se_fd, line, LINE_SIZE, MSG_DONTWAIT);
1252 continue;
1253 }
1254 setsockopt_reuseaddr(new_udp_fd);
1255 /* TODO: better do bind after vfork in parent,
1256 * so that we don't have two wildcard bound sockets
1257 * even for a brief moment? */
1258 if (bind(new_udp_fd, &sep->se_lsa->u.sa, sep->se_lsa->len) < 0) {
1259 close(new_udp_fd);
1260 goto udp_err;
1261 }
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001262 }
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001263 }
Denis Vlasenkoc1876d72006-09-23 15:58:01 +00001264
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001265 block_CHLD_HUP_ALRM(&omask);
Denis Vlasenkoc1876d72006-09-23 15:58:01 +00001266 pid = 0;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001267#ifdef INETD_BUILTINS_ENABLED
1268 /* do we need to fork? */
1269 if (sep->se_builtin == NULL
1270 || (sep->se_socktype == SOCK_STREAM
1271 && sep->se_builtin->bi_fork))
Denis Vlasenkoc1876d72006-09-23 15:58:01 +00001272#endif
1273 {
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001274 if (sep->se_max != 0) {
1275 if (++sep->se_count == 1)
1276 sep->se_time = monotonic_sec();
1277 else if (sep->se_count >= sep->se_max) {
1278 unsigned now = monotonic_sec();
1279 /* did we accumulate se_max connects too quickly? */
1280 if (now - sep->se_time <= CNT_INTERVAL) {
1281 bb_error_msg("%s/%s: too many connections, pausing",
1282 sep->se_service, sep->se_proto);
1283 remove_fd_from_set(sep->se_fd);
1284 close(sep->se_fd);
1285 sep->se_fd = -1;
1286 sep->se_count = 0;
1287 rearm_alarm(); /* will revive it in RETRYTIME sec */
Denis Vlasenko3f165fa2008-03-17 08:29:08 +00001288 restore_sigmask(&omask);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001289 maybe_close(accepted_fd);
1290 continue; /* -> check next fd in fd set */
Denis Vlasenkoc1876d72006-09-23 15:58:01 +00001291 }
Denis Vlasenkoc1876d72006-09-23 15:58:01 +00001292 sep->se_count = 0;
Denis Vlasenkoc1876d72006-09-23 15:58:01 +00001293 }
1294 }
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001295 /* on NOMMU, streamed chargen
1296 * builtin wouldn't work, but it is
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001297 * not allowed on NOMMU (ifdefed out) */
1298#ifdef INETD_BUILTINS_ENABLED
1299 if (BB_MMU && sep->se_builtin)
1300 pid = fork();
1301 else
Denis Vlasenkoc1876d72006-09-23 15:58:01 +00001302#endif
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001303 pid = vfork();
1304
1305 if (pid < 0) { /* fork error */
1306 bb_perror_msg("fork");
1307 sleep(1);
Denis Vlasenko3f165fa2008-03-17 08:29:08 +00001308 restore_sigmask(&omask);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001309 maybe_close(accepted_fd);
1310 continue; /* -> check next fd in fd set */
Denis Vlasenkoc1876d72006-09-23 15:58:01 +00001311 }
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001312 if (pid == 0)
1313 pid--; /* -1: "we did fork and we are child" */
Denis Vlasenkoc1876d72006-09-23 15:58:01 +00001314 }
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001315 /* if pid == 0 here, we never forked */
1316
1317 if (pid > 0) { /* parent */
1318 if (sep->se_wait) {
Denis Vlasenkoaefed942008-03-17 08:35:44 +00001319 /* tcp wait: we passed listening socket to child,
1320 * will wait for child to terminate */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001321 sep->se_wait = pid;
1322 remove_fd_from_set(sep->se_fd);
Denis Vlasenkoaefed942008-03-17 08:35:44 +00001323 }
1324 if (new_udp_fd >= 0) {
1325 /* udp nowait: child connected the socket,
1326 * we created and will use new, unconnected one */
1327 xmove_fd(new_udp_fd, sep->se_fd);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001328 }
Denis Vlasenko3f165fa2008-03-17 08:29:08 +00001329 restore_sigmask(&omask);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001330 maybe_close(accepted_fd);
1331 continue; /* -> check next fd in fd set */
1332 }
1333
1334 /* we are either child or didn't fork at all */
1335#ifdef INETD_BUILTINS_ENABLED
1336 if (sep->se_builtin) {
1337 if (pid) { /* "pid" is -1: we did fork */
1338 close(sep->se_fd); /* listening socket */
1339 logmode = 0; /* make xwrite etc silent */
1340 }
Denis Vlasenko3f165fa2008-03-17 08:29:08 +00001341 restore_sigmask(&omask);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001342 if (sep->se_socktype == SOCK_STREAM)
1343 sep->se_builtin->bi_stream_fn(ctrl, sep);
1344 else
1345 sep->se_builtin->bi_dgram_fn(ctrl, sep);
1346 if (pid) /* we did fork */
1347 _exit(0);
1348 maybe_close(accepted_fd);
1349 continue; /* -> check next fd in fd set */
1350 }
1351#endif
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001352 /* child */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001353 setsid();
Denis Vlasenkoaefed942008-03-17 08:35:44 +00001354 /* "nowait" udp */
1355 if (new_udp_fd >= 0) {
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001356 len_and_sockaddr *lsa = xzalloc_lsa(sep->se_family);
1357 /* peek at the packet and remember peer addr */
1358 int r = recvfrom(ctrl, NULL, 0, MSG_PEEK|MSG_DONTWAIT,
1359 &lsa->u.sa, &lsa->len);
Denis Vlasenkoaefed942008-03-17 08:35:44 +00001360 if (r < 0)
1361 goto do_exit1;
1362 /* make this socket "connected" to peer addr:
1363 * only packets from this peer will be recv'ed,
1364 * and bare write()/send() will work on it */
1365 connect(ctrl, &lsa->u.sa, lsa->len);
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001366 free(lsa);
1367 }
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001368 /* prepare env and exec program */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001369 pwd = getpwnam(sep->se_user);
1370 if (pwd == NULL) {
1371 bb_error_msg("%s: no such user", sep->se_user);
1372 goto do_exit1;
1373 }
1374 if (sep->se_group && (grp = getgrnam(sep->se_group)) == NULL) {
1375 bb_error_msg("%s: no such group", sep->se_group);
1376 goto do_exit1;
1377 }
1378 if (real_uid != 0 && real_uid != pwd->pw_uid) {
1379 /* a user running private inetd */
1380 bb_error_msg("non-root must run services as himself");
1381 goto do_exit1;
1382 }
1383 if (pwd->pw_uid) {
1384 if (sep->se_group)
1385 pwd->pw_gid = grp->gr_gid;
1386 xsetgid(pwd->pw_gid);
1387 initgroups(pwd->pw_name, pwd->pw_gid);
1388 xsetuid(pwd->pw_uid);
1389 } else if (sep->se_group) {
1390 xsetgid(grp->gr_gid);
1391 setgroups(1, &grp->gr_gid);
1392 }
1393 if (rlim_ofile.rlim_cur != rlim_ofile_cur)
1394 if (setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0)
1395 bb_perror_msg("setrlimit");
1396 closelog();
1397 xmove_fd(ctrl, 0);
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001398 xdup2(0, 1);
1399 xdup2(0, 2);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001400 /* NB: among others, this loop closes listening socket
1401 * for nowait stream children */
1402 for (sep2 = serv_list; sep2; sep2 = sep2->se_next)
1403 maybe_close(sep2->se_fd);
Denis Vlasenko8e2cfec2008-03-12 23:19:35 +00001404 sigaction_set(SIGPIPE, &saved_pipe_handler);
Denis Vlasenko3f165fa2008-03-17 08:29:08 +00001405 restore_sigmask(&omask);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001406 BB_EXECVP(sep->se_program, sep->se_argv);
1407 bb_perror_msg("exec %s", sep->se_program);
1408 do_exit1:
1409 /* eat packet in udp case */
1410 if (sep->se_socktype != SOCK_STREAM)
1411 recv(0, line, LINE_SIZE, MSG_DONTWAIT);
1412 _exit(1);
Denis Vlasenkoc1876d72006-09-23 15:58:01 +00001413 } /* for (sep = servtab...) */
Denis Vlasenkobf0a2012006-12-26 10:42:51 +00001414 } /* for (;;) */
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001415}
Glenn L McGrath06e95652003-02-09 06:51:14 +00001416
1417/*
1418 * Internet services provided internally by inetd:
1419 */
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +00001420#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001421/* Echo service -- echo data back. */
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001422/* ARGSUSED */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001423static void echo_stream(int s, servtab_t *sep ATTRIBUTE_UNUSED)
Glenn L McGrath06e95652003-02-09 06:51:14 +00001424{
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001425#if BB_MMU
Denis Vlasenkoc1876d72006-09-23 15:58:01 +00001426 while (1) {
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001427 ssize_t sz = safe_read(s, line, LINE_SIZE);
1428 if (sz <= 0)
1429 break;
1430 xwrite(s, line, sz);
Denis Vlasenkoc1876d72006-09-23 15:58:01 +00001431 }
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001432#else
1433 static const char *const args[] = { "cat", NULL };
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001434 /* no error messages */
1435 xmove_fd(xopen("/dev/null", O_WRONLY), STDERR_FILENO);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001436 BB_EXECVP("cat", (char**)args);
1437 _exit(1);
1438#endif
Glenn L McGrath06e95652003-02-09 06:51:14 +00001439}
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001440static void echo_dg(int s, servtab_t *sep)
Glenn L McGrath06e95652003-02-09 06:51:14 +00001441{
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001442 enum { BUFSIZE = 12*1024 }; /* for jumbo sized packets! :) */
1443 char *buf = xmalloc(BUFSIZE); /* too big for stack */
1444 int sz;
1445 len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
Glenn L McGrath06e95652003-02-09 06:51:14 +00001446
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001447 lsa->len = sep->se_lsa->len;
1448 /* dgram builtins are non-forking - DONT BLOCK! */
1449 sz = recvfrom(s, buf, BUFSIZE, MSG_DONTWAIT, &lsa->u.sa, &lsa->len);
1450 if (sz > 0)
1451 sendto(s, buf, sz, 0, &lsa->u.sa, lsa->len);
1452 free(buf);
Glenn L McGrath06e95652003-02-09 06:51:14 +00001453}
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +00001454#endif /* FEATURE_INETD_SUPPORT_BUILTIN_ECHO */
Glenn L McGrath06e95652003-02-09 06:51:14 +00001455
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001456
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +00001457#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001458/* Discard service -- ignore data. MMU arches only. */
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001459/* ARGSUSED */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001460static void discard_stream(int s, servtab_t *sep ATTRIBUTE_UNUSED)
Glenn L McGrath06e95652003-02-09 06:51:14 +00001461{
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001462#if BB_MMU
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001463 while (safe_read(s, line, LINE_SIZE) > 0)
1464 continue;
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001465#else
1466 static const char *const args[] = { "dd", "of=/dev/null", NULL };
1467 /* no error messages */
1468 xmove_fd(xopen("/dev/null", O_WRONLY), STDERR_FILENO);
1469 BB_EXECVP("dd", (char**)args);
1470 _exit(1);
1471#endif
Glenn L McGrath06e95652003-02-09 06:51:14 +00001472}
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001473/* ARGSUSED */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001474static void discard_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
Glenn L McGrath06e95652003-02-09 06:51:14 +00001475{
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001476 /* dgram builtins are non-forking - DONT BLOCK! */
1477 recv(s, line, LINE_SIZE, MSG_DONTWAIT);
Glenn L McGrath06e95652003-02-09 06:51:14 +00001478}
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +00001479#endif /* FEATURE_INETD_SUPPORT_BUILTIN_DISCARD */
Glenn L McGrath06e95652003-02-09 06:51:14 +00001480
1481
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +00001482#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
Glenn L McGrath06e95652003-02-09 06:51:14 +00001483#define LINESIZ 72
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001484static void init_ring(void)
Glenn L McGrath06e95652003-02-09 06:51:14 +00001485{
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001486 int i;
Glenn L McGrath06e95652003-02-09 06:51:14 +00001487
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001488 end_ring = ring;
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001489 for (i = 0; i <= 128; ++i)
1490 if (isprint(i))
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001491 *end_ring++ = i;
Glenn L McGrath06e95652003-02-09 06:51:14 +00001492}
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001493/* Character generator. MMU arches only. */
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001494/* ARGSUSED */
Denis Vlasenko68404f12008-03-17 09:00:54 +00001495static void chargen_stream(int s, servtab_t *sep ATTRIBUTE_UNUSED)
Glenn L McGrath06e95652003-02-09 06:51:14 +00001496{
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001497 char *rs;
1498 int len;
1499 char text[LINESIZ + 2];
Glenn L McGrath06e95652003-02-09 06:51:14 +00001500
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001501 if (!end_ring) {
1502 init_ring();
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001503 rs = ring;
1504 }
Glenn L McGrath06e95652003-02-09 06:51:14 +00001505
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001506 text[LINESIZ] = '\r';
1507 text[LINESIZ + 1] = '\n';
Denis Vlasenkoc1876d72006-09-23 15:58:01 +00001508 rs = ring;
1509 for (;;) {
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001510 len = end_ring - rs;
Denis Vlasenkoc1876d72006-09-23 15:58:01 +00001511 if (len >= LINESIZ)
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001512 memmove(text, rs, LINESIZ);
1513 else {
1514 memmove(text, rs, len);
1515 memmove(text + len, ring, LINESIZ - len);
1516 }
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001517 if (++rs == end_ring)
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001518 rs = ring;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001519 xwrite(s, text, sizeof(text));
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001520 }
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001521}
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001522/* ARGSUSED */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001523static void chargen_dg(int s, servtab_t *sep)
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001524{
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001525 int len;
1526 char text[LINESIZ + 2];
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001527 len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
1528
1529 /* Eat UDP packet which started it all */
1530 /* dgram builtins are non-forking - DONT BLOCK! */
1531 lsa->len = sep->se_lsa->len;
1532 if (recvfrom(s, text, sizeof(text), MSG_DONTWAIT, &lsa->u.sa, &lsa->len) < 0)
1533 return;
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001534
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001535 if (!end_ring) {
1536 init_ring();
1537 ring_pos = ring;
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001538 }
1539
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001540 len = end_ring - ring_pos;
Denis Vlasenko512a5452007-09-24 10:41:30 +00001541 if (len >= LINESIZ)
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001542 memmove(text, ring_pos, LINESIZ);
Glenn L McGrath06e95652003-02-09 06:51:14 +00001543 else {
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001544 memmove(text, ring_pos, len);
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001545 memmove(text + len, ring, LINESIZ - len);
Glenn L McGrath06e95652003-02-09 06:51:14 +00001546 }
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001547 if (++ring_pos == end_ring)
1548 ring_pos = ring;
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001549 text[LINESIZ] = '\r';
1550 text[LINESIZ + 1] = '\n';
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001551 sendto(s, text, sizeof(text), 0, &lsa->u.sa, lsa->len);
Glenn L McGrath06e95652003-02-09 06:51:14 +00001552}
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +00001553#endif /* FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN */
Glenn L McGrath06e95652003-02-09 06:51:14 +00001554
1555
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +00001556#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME
Glenn L McGrath06e95652003-02-09 06:51:14 +00001557/*
1558 * Return a machine readable date and time, in the form of the
1559 * number of seconds since midnight, Jan 1, 1900. Since gettimeofday
1560 * returns the number of seconds since midnight, Jan 1, 1970,
1561 * we must add 2208988800 seconds to this figure to make up for
1562 * some seventy years Bell Labs was asleep.
1563 */
Denis Vlasenko4cf1d082008-03-12 23:13:50 +00001564static uint32_t machtime(void)
Glenn L McGrath06e95652003-02-09 06:51:14 +00001565{
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001566 struct timeval tv;
Glenn L McGrath06e95652003-02-09 06:51:14 +00001567
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001568 gettimeofday(&tv, NULL);
1569 return htonl((uint32_t)(tv.tv_sec + 2208988800));
Glenn L McGrath06e95652003-02-09 06:51:14 +00001570}
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001571/* ARGSUSED */
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001572static void machtime_stream(int s, servtab_t *sep ATTRIBUTE_UNUSED)
Glenn L McGrath06e95652003-02-09 06:51:14 +00001573{
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001574 uint32_t result;
Glenn L McGrath06e95652003-02-09 06:51:14 +00001575
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001576 result = machtime();
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001577 full_write(s, &result, sizeof(result));
Glenn L McGrath06e95652003-02-09 06:51:14 +00001578}
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001579static void machtime_dg(int s, servtab_t *sep)
Glenn L McGrath06e95652003-02-09 06:51:14 +00001580{
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001581 uint32_t result;
1582 len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
Glenn L McGrath06e95652003-02-09 06:51:14 +00001583
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001584 lsa->len = sep->se_lsa->len;
1585 if (recvfrom(s, line, LINE_SIZE, MSG_DONTWAIT, &lsa->u.sa, &lsa->len) < 0)
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001586 return;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001587
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001588 result = machtime();
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001589 sendto(s, &result, sizeof(result), 0, &lsa->u.sa, lsa->len);
Glenn L McGrath06e95652003-02-09 06:51:14 +00001590}
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +00001591#endif /* FEATURE_INETD_SUPPORT_BUILTIN_TIME */
Glenn L McGrath06e95652003-02-09 06:51:14 +00001592
1593
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +00001594#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
Glenn L McGrath06e95652003-02-09 06:51:14 +00001595/* Return human-readable time of day */
"Vladimir N. Oleynik"1a2f4d92005-10-03 08:08:58 +00001596/* ARGSUSED */
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001597static void daytime_stream(int s, servtab_t *sep ATTRIBUTE_UNUSED)
Glenn L McGrath06e95652003-02-09 06:51:14 +00001598{
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001599 time_t t;
Glenn L McGrath06e95652003-02-09 06:51:14 +00001600
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001601 t = time(NULL);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001602 fdprintf(s, "%.24s\r\n", ctime(&t));
Glenn L McGrath06e95652003-02-09 06:51:14 +00001603}
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001604static void daytime_dg(int s, servtab_t *sep)
Glenn L McGrath06e95652003-02-09 06:51:14 +00001605{
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001606 time_t t;
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001607 len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
1608
1609 lsa->len = sep->se_lsa->len;
1610 if (recvfrom(s, line, LINE_SIZE, MSG_DONTWAIT, &lsa->u.sa, &lsa->len) < 0)
1611 return;
Glenn L McGrath06e95652003-02-09 06:51:14 +00001612
Denis Vlasenkoec17d432006-09-23 15:18:38 +00001613 t = time(NULL);
Denis Vlasenko4e6d5112008-03-12 22:14:34 +00001614 sprintf(line, "%.24s\r\n", ctime(&t));
1615 sendto(s, line, strlen(line), 0, &lsa->u.sa, lsa->len);
Glenn L McGrath06e95652003-02-09 06:51:14 +00001616}
Denis Vlasenkod1a6e8d2007-01-14 14:46:18 +00001617#endif /* FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME */