[1765] | 1 | /* vi: set sw=4 ts=4: */
|
---|
[821] | 2 | /* $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> */
|
---|
[2725] | 6 | /* IPv6 support, many bug fixes by Denys Vlasenko (c) 2008 */
|
---|
[821] | 7 | /*
|
---|
| 8 | * Copyright (c) 1983,1991 The Regents of the University of California.
|
---|
| 9 | * All rights reserved.
|
---|
| 10 | *
|
---|
| 11 | * 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.
|
---|
| 26 | *
|
---|
[1765] | 27 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS" AND
|
---|
[821] | 28 | * 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.
|
---|
| 38 | */
|
---|
| 39 |
|
---|
[1765] | 40 | /* Inetd - Internet super-server
|
---|
[821] | 41 | *
|
---|
[2725] | 42 | * 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
|
---|
[821] | 45 | * connection is made, by creating a process. This process
|
---|
| 46 | * is passed the connection as file descriptor 0 and is
|
---|
[2725] | 47 | * expected to do a getpeername to find out peer's host
|
---|
[821] | 48 | * and port.
|
---|
| 49 | * Datagram oriented services are invoked when a datagram
|
---|
| 50 | * arrives; a process is created and passed a pending message
|
---|
[2725] | 51 | * on file descriptor 0. peer's address can be obtained
|
---|
| 52 | * using recvfrom.
|
---|
[821] | 53 | *
|
---|
| 54 | * Inetd uses a configuration file which is read at startup
|
---|
| 55 | * and, possibly, at some later time in response to a hangup signal.
|
---|
[1765] | 56 | * The configuration file is "free format" with fields given in the
|
---|
[821] | 57 | * order shown below. Continuation lines for an entry must begin with
|
---|
| 58 | * a space or tab. All fields must be present in each entry.
|
---|
| 59 | *
|
---|
[2725] | 60 | * service_name must be in /etc/services
|
---|
| 61 | * socket_type stream/dgram/raw/rdm/seqpacket
|
---|
[821] | 62 | * protocol must be in /etc/protocols
|
---|
[2725] | 63 | * (usually "tcp" or "udp")
|
---|
[821] | 64 | * wait/nowait[.max] single-threaded/multi-threaded, max #
|
---|
| 65 | * user[.group] or user[:group] user/group to run daemon as
|
---|
[2725] | 66 | * server_program full path name
|
---|
| 67 | * server_program_arguments maximum of MAXARGS (20)
|
---|
[821] | 68 | *
|
---|
| 69 | * For RPC services
|
---|
[2725] | 70 | * service_name/version must be in /etc/rpc
|
---|
| 71 | * socket_type stream/dgram/raw/rdm/seqpacket
|
---|
| 72 | * rpc/protocol "rpc/tcp" etc
|
---|
[821] | 73 | * wait/nowait[.max] single-threaded/multi-threaded
|
---|
| 74 | * user[.group] or user[:group] user to run daemon as
|
---|
[2725] | 75 | * server_program full path name
|
---|
| 76 | * server_program_arguments maximum of MAXARGS (20)
|
---|
[821] | 77 | *
|
---|
| 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
|
---|
[2725] | 81 | * consists of a single '*' character, INADDR_ANY is used.
|
---|
[821] | 82 | *
|
---|
| 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.
|
---|
| 101 | *
|
---|
[2725] | 102 | * Comment lines are indicated by a '#' in column 1.
|
---|
[821] | 103 | */
|
---|
| 104 |
|
---|
[1765] | 105 | /* inetd rules for passing file descriptors to children
|
---|
| 106 | * (http://www.freebsd.org/cgi/man.cgi?query=inetd):
|
---|
[821] | 107 | *
|
---|
[1765] | 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
|
---|
[2725] | 121 | * said to be "single-threaded". The comsat(8), biff(1) and talkd(8)
|
---|
[1765] | 122 | * 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.
|
---|
| 133 | */
|
---|
| 134 |
|
---|
[2725] | 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.
|
---|
| 140 | */
|
---|
| 141 |
|
---|
| 142 | /* Here's the scoop concerning the user[:group] feature:
|
---|
| 143 | * 1) group is not specified:
|
---|
[821] | 144 | * a) user = root: NO setuid() or setgid() is done
|
---|
[2725] | 145 | * b) other: initgroups(name, primary group)
|
---|
| 146 | * setgid(primary group as found in passwd)
|
---|
[821] | 147 | * setuid()
|
---|
[2725] | 148 | * 2) group is specified:
|
---|
[821] | 149 | * a) user = root: setgid(specified group)
|
---|
| 150 | * NO initgroups()
|
---|
| 151 | * NO setuid()
|
---|
[2725] | 152 | * b) other: initgroups(name, specified group)
|
---|
| 153 | * setgid(specified group)
|
---|
[821] | 154 | * setuid()
|
---|
| 155 | */
|
---|
| 156 |
|
---|
[3232] | 157 | //usage:#define inetd_trivial_usage
|
---|
| 158 | //usage: "[-fe] [-q N] [-R N] [CONFFILE]"
|
---|
| 159 | //usage:#define inetd_full_usage "\n\n"
|
---|
| 160 | //usage: "Listen for network connections and launch programs\n"
|
---|
| 161 | //usage: "\n -f Run in foreground"
|
---|
| 162 | //usage: "\n -e Log to stderr"
|
---|
| 163 | //usage: "\n -q N Socket listen queue (default: 128)"
|
---|
| 164 | //usage: "\n -R N Pause services after N connects/min"
|
---|
| 165 | //usage: "\n (default: 0 - disabled)"
|
---|
| 166 |
|
---|
[1765] | 167 | #include <syslog.h>
|
---|
[3232] | 168 | #include <sys/resource.h> /* setrlimit */
|
---|
| 169 | #include <sys/socket.h> /* un.h may need this */
|
---|
[821] | 170 | #include <sys/un.h>
|
---|
| 171 |
|
---|
[2725] | 172 | #include "libbb.h"
|
---|
[821] | 173 |
|
---|
[1765] | 174 | #if ENABLE_FEATURE_INETD_RPC
|
---|
[3232] | 175 | # if defined(__UCLIBC__) && ! defined(__UCLIBC_HAS_RPC__)
|
---|
| 176 | # error "You need to build uClibc with UCLIBC_HAS_RPC for NFS support"
|
---|
| 177 | # endif
|
---|
| 178 | # include <rpc/rpc.h>
|
---|
| 179 | # include <rpc/pmap_clnt.h>
|
---|
[821] | 180 | #endif
|
---|
| 181 |
|
---|
[2725] | 182 | #if !BB_MMU
|
---|
| 183 | /* stream version of chargen is forking but not execing,
|
---|
| 184 | * can't do that (easily) on NOMMU */
|
---|
| 185 | #undef ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
|
---|
| 186 | #define ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN 0
|
---|
| 187 | #endif
|
---|
[821] | 188 |
|
---|
[2725] | 189 | #define CNT_INTERVAL 60 /* servers in CNT_INTERVAL sec. */
|
---|
| 190 | #define RETRYTIME 60 /* retry after bind or server fail */
|
---|
[821] | 191 |
|
---|
[2725] | 192 | // TODO: explain, or get rid of setrlimit games
|
---|
| 193 |
|
---|
[821] | 194 | #ifndef RLIMIT_NOFILE
|
---|
| 195 | #define RLIMIT_NOFILE RLIMIT_OFILE
|
---|
| 196 | #endif
|
---|
| 197 |
|
---|
| 198 | #ifndef OPEN_MAX
|
---|
| 199 | #define OPEN_MAX 64
|
---|
| 200 | #endif
|
---|
| 201 |
|
---|
| 202 | /* Reserve some descriptors, 3 stdio + at least: 1 log, 1 conf. file */
|
---|
[1765] | 203 | #define FD_MARGIN 8
|
---|
[821] | 204 |
|
---|
[2725] | 205 | #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD \
|
---|
| 206 | || ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO \
|
---|
| 207 | || ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN \
|
---|
| 208 | || ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME \
|
---|
| 209 | || ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
|
---|
| 210 | # define INETD_BUILTINS_ENABLED
|
---|
[821] | 211 | #endif
|
---|
| 212 |
|
---|
[2725] | 213 | typedef struct servtab_t {
|
---|
| 214 | /* The most frequently referenced one: */
|
---|
| 215 | int se_fd; /* open descriptor */
|
---|
| 216 | /* NB: 'biggest fields last' saves on code size (~250 bytes) */
|
---|
| 217 | /* [addr:]service socktype proto wait user[:group] prog [args] */
|
---|
| 218 | char *se_local_hostname; /* addr to listen on */
|
---|
| 219 | char *se_service; /* "80" or "www" or "mount/2[-3]" */
|
---|
| 220 | /* socktype is in se_socktype */ /* "stream" "dgram" "raw" "rdm" "seqpacket" */
|
---|
| 221 | char *se_proto; /* "unix" or "[rpc/]tcp[6]" */
|
---|
[1765] | 222 | #if ENABLE_FEATURE_INETD_RPC
|
---|
| 223 | int se_rpcprog; /* rpc program number */
|
---|
[2725] | 224 | int se_rpcver_lo; /* rpc program lowest version */
|
---|
| 225 | int se_rpcver_hi; /* rpc program highest version */
|
---|
| 226 | #define is_rpc_service(sep) ((sep)->se_rpcver_lo != 0)
|
---|
[821] | 227 | #else
|
---|
[2725] | 228 | #define is_rpc_service(sep) 0
|
---|
[821] | 229 | #endif
|
---|
[2725] | 230 | pid_t se_wait; /* 0:"nowait", 1:"wait", >1:"wait" */
|
---|
| 231 | /* and waiting for this pid */
|
---|
| 232 | socktype_t se_socktype; /* SOCK_STREAM/DGRAM/RDM/... */
|
---|
| 233 | family_t se_family; /* AF_UNIX/INET[6] */
|
---|
| 234 | /* se_proto_no is used by RPC code only... hmm */
|
---|
| 235 | smallint se_proto_no; /* IPPROTO_TCP/UDP, n/a for AF_UNIX */
|
---|
| 236 | smallint se_checked; /* looked at during merge */
|
---|
| 237 | unsigned se_max; /* allowed instances per minute */
|
---|
| 238 | unsigned se_count; /* number started since se_time */
|
---|
| 239 | unsigned se_time; /* when we started counting */
|
---|
[1765] | 240 | char *se_user; /* user name to run as */
|
---|
[2725] | 241 | char *se_group; /* group name to run as, can be NULL */
|
---|
| 242 | #ifdef INETD_BUILTINS_ENABLED
|
---|
| 243 | const struct builtin *se_builtin; /* if built-in, description */
|
---|
[821] | 244 | #endif
|
---|
[2725] | 245 | struct servtab_t *se_next;
|
---|
| 246 | len_and_sockaddr *se_lsa;
|
---|
| 247 | char *se_program; /* server program */
|
---|
[821] | 248 | #define MAXARGV 20
|
---|
[1765] | 249 | char *se_argv[MAXARGV + 1]; /* program arguments */
|
---|
[821] | 250 | } servtab_t;
|
---|
| 251 |
|
---|
[2725] | 252 | #ifdef INETD_BUILTINS_ENABLED
|
---|
| 253 | /* Echo received data */
|
---|
[1765] | 254 | #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
|
---|
[2725] | 255 | static void FAST_FUNC echo_stream(int, servtab_t *);
|
---|
| 256 | static void FAST_FUNC echo_dg(int, servtab_t *);
|
---|
[821] | 257 | #endif
|
---|
[2725] | 258 | /* Internet /dev/null */
|
---|
[1765] | 259 | #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
|
---|
[2725] | 260 | static void FAST_FUNC discard_stream(int, servtab_t *);
|
---|
| 261 | static void FAST_FUNC discard_dg(int, servtab_t *);
|
---|
[821] | 262 | #endif
|
---|
[2725] | 263 | /* Return 32 bit time since 1900 */
|
---|
[1765] | 264 | #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME
|
---|
[2725] | 265 | static void FAST_FUNC machtime_stream(int, servtab_t *);
|
---|
| 266 | static void FAST_FUNC machtime_dg(int, servtab_t *);
|
---|
[821] | 267 | #endif
|
---|
[2725] | 268 | /* Return human-readable time */
|
---|
[1765] | 269 | #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
|
---|
[2725] | 270 | static void FAST_FUNC daytime_stream(int, servtab_t *);
|
---|
| 271 | static void FAST_FUNC daytime_dg(int, servtab_t *);
|
---|
[821] | 272 | #endif
|
---|
[2725] | 273 | /* Familiar character generator */
|
---|
[1765] | 274 | #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
|
---|
[2725] | 275 | static void FAST_FUNC chargen_stream(int, servtab_t *);
|
---|
| 276 | static void FAST_FUNC chargen_dg(int, servtab_t *);
|
---|
[821] | 277 | #endif
|
---|
| 278 |
|
---|
[2725] | 279 | struct builtin {
|
---|
| 280 | /* NB: not necessarily NUL terminated */
|
---|
| 281 | char bi_service7[7]; /* internally provided service name */
|
---|
| 282 | uint8_t bi_fork; /* 1 if stream fn should run in child */
|
---|
| 283 | void (*bi_stream_fn)(int, servtab_t *) FAST_FUNC;
|
---|
| 284 | void (*bi_dgram_fn)(int, servtab_t *) FAST_FUNC;
|
---|
| 285 | };
|
---|
| 286 |
|
---|
[821] | 287 | static const struct builtin builtins[] = {
|
---|
[1765] | 288 | #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
|
---|
[2725] | 289 | { "echo", 1, echo_stream, echo_dg },
|
---|
[821] | 290 | #endif
|
---|
[1765] | 291 | #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
|
---|
[2725] | 292 | { "discard", 1, discard_stream, discard_dg },
|
---|
[821] | 293 | #endif
|
---|
[2725] | 294 | #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
|
---|
| 295 | { "chargen", 1, chargen_stream, chargen_dg },
|
---|
| 296 | #endif
|
---|
[1765] | 297 | #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME
|
---|
[2725] | 298 | { "time", 0, machtime_stream, machtime_dg },
|
---|
[821] | 299 | #endif
|
---|
[1765] | 300 | #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
|
---|
[2725] | 301 | { "daytime", 0, daytime_stream, daytime_dg },
|
---|
[821] | 302 | #endif
|
---|
[2725] | 303 | };
|
---|
| 304 | #endif /* INETD_BUILTINS_ENABLED */
|
---|
| 305 |
|
---|
| 306 | struct globals {
|
---|
| 307 | rlim_t rlim_ofile_cur;
|
---|
| 308 | struct rlimit rlim_ofile;
|
---|
| 309 | servtab_t *serv_list;
|
---|
| 310 | int global_queuelen;
|
---|
| 311 | int maxsock; /* max fd# in allsock, -1: unknown */
|
---|
| 312 | /* whenever maxsock grows, prev_maxsock is set to new maxsock,
|
---|
| 313 | * but if maxsock is set to -1, prev_maxsock is not changed */
|
---|
| 314 | int prev_maxsock;
|
---|
| 315 | unsigned max_concurrency;
|
---|
| 316 | smallint alarm_armed;
|
---|
| 317 | uid_t real_uid; /* user ID who ran us */
|
---|
| 318 | const char *config_filename;
|
---|
| 319 | parser_t *parser;
|
---|
| 320 | char *default_local_hostname;
|
---|
[1765] | 321 | #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
|
---|
[2725] | 322 | char *end_ring;
|
---|
| 323 | char *ring_pos;
|
---|
| 324 | char ring[128];
|
---|
[821] | 325 | #endif
|
---|
[2725] | 326 | fd_set allsock;
|
---|
| 327 | /* Used in next_line(), and as scratch read buffer */
|
---|
| 328 | char line[256]; /* _at least_ 256, see LINE_SIZE */
|
---|
| 329 | } FIX_ALIASING;
|
---|
| 330 | #define G (*(struct globals*)&bb_common_bufsiz1)
|
---|
| 331 | enum { LINE_SIZE = COMMON_BUFSIZE - offsetof(struct globals, line) };
|
---|
| 332 | struct BUG_G_too_big {
|
---|
| 333 | char BUG_G_too_big[sizeof(G) <= COMMON_BUFSIZE ? 1 : -1];
|
---|
[821] | 334 | };
|
---|
[2725] | 335 | #define rlim_ofile_cur (G.rlim_ofile_cur )
|
---|
| 336 | #define rlim_ofile (G.rlim_ofile )
|
---|
| 337 | #define serv_list (G.serv_list )
|
---|
| 338 | #define global_queuelen (G.global_queuelen)
|
---|
| 339 | #define maxsock (G.maxsock )
|
---|
| 340 | #define prev_maxsock (G.prev_maxsock )
|
---|
| 341 | #define max_concurrency (G.max_concurrency)
|
---|
| 342 | #define alarm_armed (G.alarm_armed )
|
---|
| 343 | #define real_uid (G.real_uid )
|
---|
| 344 | #define config_filename (G.config_filename)
|
---|
| 345 | #define parser (G.parser )
|
---|
| 346 | #define default_local_hostname (G.default_local_hostname)
|
---|
| 347 | #define first_ps_byte (G.first_ps_byte )
|
---|
| 348 | #define last_ps_byte (G.last_ps_byte )
|
---|
| 349 | #define end_ring (G.end_ring )
|
---|
| 350 | #define ring_pos (G.ring_pos )
|
---|
| 351 | #define ring (G.ring )
|
---|
| 352 | #define allsock (G.allsock )
|
---|
| 353 | #define line (G.line )
|
---|
| 354 | #define INIT_G() do { \
|
---|
| 355 | rlim_ofile_cur = OPEN_MAX; \
|
---|
| 356 | global_queuelen = 128; \
|
---|
| 357 | config_filename = "/etc/inetd.conf"; \
|
---|
| 358 | } while (0)
|
---|
[821] | 359 |
|
---|
[3232] | 360 | #if 1
|
---|
| 361 | # define dbg(...) ((void)0)
|
---|
| 362 | #else
|
---|
| 363 | # define dbg(...) \
|
---|
| 364 | do { \
|
---|
| 365 | int dbg_fd = open("inetd_debug.log", O_WRONLY | O_CREAT | O_APPEND, 0666); \
|
---|
| 366 | if (dbg_fd >= 0) { \
|
---|
| 367 | fdprintf(dbg_fd, "%d: ", getpid()); \
|
---|
| 368 | fdprintf(dbg_fd, __VA_ARGS__); \
|
---|
| 369 | close(dbg_fd); \
|
---|
| 370 | } \
|
---|
| 371 | } while (0)
|
---|
| 372 | #endif
|
---|
| 373 |
|
---|
[2725] | 374 | static void maybe_close(int fd)
|
---|
| 375 | {
|
---|
[3232] | 376 | if (fd >= 0) {
|
---|
[2725] | 377 | close(fd);
|
---|
[3232] | 378 | dbg("closed fd:%d\n", fd);
|
---|
| 379 | }
|
---|
[2725] | 380 | }
|
---|
[821] | 381 |
|
---|
[2725] | 382 | // TODO: move to libbb?
|
---|
| 383 | static len_and_sockaddr *xzalloc_lsa(int family)
|
---|
| 384 | {
|
---|
| 385 | len_and_sockaddr *lsa;
|
---|
| 386 | int sz;
|
---|
[821] | 387 |
|
---|
[2725] | 388 | sz = sizeof(struct sockaddr_in);
|
---|
| 389 | if (family == AF_UNIX)
|
---|
| 390 | sz = sizeof(struct sockaddr_un);
|
---|
| 391 | #if ENABLE_FEATURE_IPV6
|
---|
| 392 | if (family == AF_INET6)
|
---|
| 393 | sz = sizeof(struct sockaddr_in6);
|
---|
| 394 | #endif
|
---|
| 395 | lsa = xzalloc(LSA_LEN_SIZE + sz);
|
---|
| 396 | lsa->len = sz;
|
---|
| 397 | lsa->u.sa.sa_family = family;
|
---|
| 398 | return lsa;
|
---|
| 399 | }
|
---|
[821] | 400 |
|
---|
[2725] | 401 | static void rearm_alarm(void)
|
---|
[821] | 402 | {
|
---|
[2725] | 403 | if (!alarm_armed) {
|
---|
| 404 | alarm_armed = 1;
|
---|
| 405 | alarm(RETRYTIME);
|
---|
| 406 | }
|
---|
[821] | 407 | }
|
---|
| 408 |
|
---|
[2725] | 409 | static void block_CHLD_HUP_ALRM(sigset_t *m)
|
---|
[821] | 410 | {
|
---|
[2725] | 411 | sigemptyset(m);
|
---|
| 412 | sigaddset(m, SIGCHLD);
|
---|
| 413 | sigaddset(m, SIGHUP);
|
---|
| 414 | sigaddset(m, SIGALRM);
|
---|
| 415 | sigprocmask(SIG_BLOCK, m, m); /* old sigmask is stored in m */
|
---|
[821] | 416 | }
|
---|
| 417 |
|
---|
[2725] | 418 | static void restore_sigmask(sigset_t *m)
|
---|
[821] | 419 | {
|
---|
[2725] | 420 | sigprocmask(SIG_SETMASK, m, NULL);
|
---|
[821] | 421 | }
|
---|
| 422 |
|
---|
[1765] | 423 | #if ENABLE_FEATURE_INETD_RPC
|
---|
| 424 | static void register_rpc(servtab_t *sep)
|
---|
[821] | 425 | {
|
---|
[1765] | 426 | int n;
|
---|
| 427 | struct sockaddr_in ir_sin;
|
---|
| 428 | socklen_t size;
|
---|
[821] | 429 |
|
---|
[2725] | 430 | size = sizeof(ir_sin);
|
---|
[1765] | 431 | if (getsockname(sep->se_fd, (struct sockaddr *) &ir_sin, &size) < 0) {
|
---|
[2725] | 432 | bb_perror_msg("getsockname");
|
---|
[1765] | 433 | return;
|
---|
| 434 | }
|
---|
[821] | 435 |
|
---|
[2725] | 436 | for (n = sep->se_rpcver_lo; n <= sep->se_rpcver_hi; n++) {
|
---|
| 437 | pmap_unset(sep->se_rpcprog, n);
|
---|
| 438 | if (!pmap_set(sep->se_rpcprog, n, sep->se_proto_no, ntohs(ir_sin.sin_port)))
|
---|
| 439 | bb_perror_msg("%s %s: pmap_set(%u,%u,%u,%u)",
|
---|
| 440 | sep->se_service, sep->se_proto,
|
---|
| 441 | sep->se_rpcprog, n, sep->se_proto_no, ntohs(ir_sin.sin_port));
|
---|
[1765] | 442 | }
|
---|
[821] | 443 | }
|
---|
| 444 |
|
---|
[1765] | 445 | static void unregister_rpc(servtab_t *sep)
|
---|
[821] | 446 | {
|
---|
[1765] | 447 | int n;
|
---|
[821] | 448 |
|
---|
[2725] | 449 | for (n = sep->se_rpcver_lo; n <= sep->se_rpcver_hi; n++) {
|
---|
[1765] | 450 | if (!pmap_unset(sep->se_rpcprog, n))
|
---|
[2725] | 451 | bb_perror_msg("pmap_unset(%u,%u)", sep->se_rpcprog, n);
|
---|
[1765] | 452 | }
|
---|
[821] | 453 | }
|
---|
[1765] | 454 | #endif /* FEATURE_INETD_RPC */
|
---|
[821] | 455 |
|
---|
[2725] | 456 | static void bump_nofile(void)
|
---|
[821] | 457 | {
|
---|
[2725] | 458 | enum { FD_CHUNK = 32 };
|
---|
[1765] | 459 | struct rlimit rl;
|
---|
[821] | 460 |
|
---|
[2725] | 461 | /* Never fails under Linux (except if you pass it bad arguments) */
|
---|
| 462 | getrlimit(RLIMIT_NOFILE, &rl);
|
---|
[1765] | 463 | rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK);
|
---|
| 464 | rl.rlim_cur = MIN(FD_SETSIZE, rl.rlim_cur + FD_CHUNK);
|
---|
| 465 | if (rl.rlim_cur <= rlim_ofile_cur) {
|
---|
[2725] | 466 | bb_error_msg("can't extend file limit, max = %d",
|
---|
[1765] | 467 | (int) rl.rlim_cur);
|
---|
[2725] | 468 | return;
|
---|
[1765] | 469 | }
|
---|
[821] | 470 |
|
---|
[1765] | 471 | if (setrlimit(RLIMIT_NOFILE, &rl) < 0) {
|
---|
| 472 | bb_perror_msg("setrlimit");
|
---|
[2725] | 473 | return;
|
---|
[1765] | 474 | }
|
---|
[821] | 475 |
|
---|
[1765] | 476 | rlim_ofile_cur = rl.rlim_cur;
|
---|
[821] | 477 | }
|
---|
| 478 |
|
---|
[2725] | 479 | static void remove_fd_from_set(int fd)
|
---|
[821] | 480 | {
|
---|
[2725] | 481 | if (fd >= 0) {
|
---|
| 482 | FD_CLR(fd, &allsock);
|
---|
[3232] | 483 | dbg("stopped listening on fd:%d\n", fd);
|
---|
[2725] | 484 | maxsock = -1;
|
---|
[3232] | 485 | dbg("maxsock:%d\n", maxsock);
|
---|
[2725] | 486 | }
|
---|
| 487 | }
|
---|
[821] | 488 |
|
---|
[2725] | 489 | static void add_fd_to_set(int fd)
|
---|
| 490 | {
|
---|
| 491 | if (fd >= 0) {
|
---|
| 492 | FD_SET(fd, &allsock);
|
---|
[3232] | 493 | dbg("started listening on fd:%d\n", fd);
|
---|
[2725] | 494 | if (maxsock >= 0 && fd > maxsock) {
|
---|
| 495 | prev_maxsock = maxsock = fd;
|
---|
[3232] | 496 | dbg("maxsock:%d\n", maxsock);
|
---|
[2725] | 497 | if ((rlim_t)fd > rlim_ofile_cur - FD_MARGIN)
|
---|
| 498 | bump_nofile();
|
---|
| 499 | }
|
---|
| 500 | }
|
---|
| 501 | }
|
---|
| 502 |
|
---|
| 503 | static void recalculate_maxsock(void)
|
---|
| 504 | {
|
---|
| 505 | int fd = 0;
|
---|
| 506 |
|
---|
| 507 | /* We may have no services, in this case maxsock should still be >= 0
|
---|
| 508 | * (code elsewhere is not happy with maxsock == -1) */
|
---|
| 509 | maxsock = 0;
|
---|
| 510 | while (fd <= prev_maxsock) {
|
---|
| 511 | if (FD_ISSET(fd, &allsock))
|
---|
| 512 | maxsock = fd;
|
---|
| 513 | fd++;
|
---|
| 514 | }
|
---|
[3232] | 515 | dbg("recalculated maxsock:%d\n", maxsock);
|
---|
[2725] | 516 | prev_maxsock = maxsock;
|
---|
| 517 | if ((rlim_t)maxsock > rlim_ofile_cur - FD_MARGIN)
|
---|
| 518 | bump_nofile();
|
---|
| 519 | }
|
---|
| 520 |
|
---|
| 521 | static void prepare_socket_fd(servtab_t *sep)
|
---|
| 522 | {
|
---|
| 523 | int r, fd;
|
---|
| 524 |
|
---|
| 525 | fd = socket(sep->se_family, sep->se_socktype, 0);
|
---|
| 526 | if (fd < 0) {
|
---|
| 527 | bb_perror_msg("socket");
|
---|
[1765] | 528 | return;
|
---|
| 529 | }
|
---|
[2725] | 530 | setsockopt_reuseaddr(fd);
|
---|
[821] | 531 |
|
---|
[1765] | 532 | #if ENABLE_FEATURE_INETD_RPC
|
---|
[2725] | 533 | if (is_rpc_service(sep)) {
|
---|
[1765] | 534 | struct passwd *pwd;
|
---|
[821] | 535 |
|
---|
[2725] | 536 | /* zero out the port for all RPC services; let bind()
|
---|
| 537 | * find one. */
|
---|
[3232] | 538 | set_nport(&sep->se_lsa->u.sa, 0);
|
---|
[821] | 539 |
|
---|
[2725] | 540 | /* for RPC services, attempt to use a reserved port
|
---|
| 541 | * if they are going to be running as root. */
|
---|
| 542 | if (real_uid == 0 && sep->se_family == AF_INET
|
---|
| 543 | && (pwd = getpwnam(sep->se_user)) != NULL
|
---|
| 544 | && pwd->pw_uid == 0
|
---|
| 545 | ) {
|
---|
| 546 | r = bindresvport(fd, &sep->se_lsa->u.sin);
|
---|
| 547 | } else {
|
---|
| 548 | r = bind(fd, &sep->se_lsa->u.sa, sep->se_lsa->len);
|
---|
[1765] | 549 | }
|
---|
[2725] | 550 | if (r == 0) {
|
---|
| 551 | int saveerrno = errno;
|
---|
| 552 | /* update lsa with port# */
|
---|
| 553 | getsockname(fd, &sep->se_lsa->u.sa, &sep->se_lsa->len);
|
---|
| 554 | errno = saveerrno;
|
---|
| 555 | }
|
---|
[1765] | 556 | } else
|
---|
[821] | 557 | #endif
|
---|
[2725] | 558 | {
|
---|
| 559 | if (sep->se_family == AF_UNIX) {
|
---|
| 560 | struct sockaddr_un *sun;
|
---|
| 561 | sun = (struct sockaddr_un*)&(sep->se_lsa->u.sa);
|
---|
| 562 | unlink(sun->sun_path);
|
---|
| 563 | }
|
---|
| 564 | r = bind(fd, &sep->se_lsa->u.sa, sep->se_lsa->len);
|
---|
| 565 | }
|
---|
[1765] | 566 | if (r < 0) {
|
---|
[2725] | 567 | bb_perror_msg("%s/%s: bind",
|
---|
| 568 | sep->se_service, sep->se_proto);
|
---|
| 569 | close(fd);
|
---|
| 570 | rearm_alarm();
|
---|
[1765] | 571 | return;
|
---|
[821] | 572 | }
|
---|
[3232] | 573 |
|
---|
| 574 | if (sep->se_socktype == SOCK_STREAM) {
|
---|
[2725] | 575 | listen(fd, global_queuelen);
|
---|
[3232] | 576 | dbg("new sep->se_fd:%d (stream)\n", fd);
|
---|
| 577 | } else {
|
---|
| 578 | dbg("new sep->se_fd:%d (!stream)\n", fd);
|
---|
| 579 | }
|
---|
[821] | 580 |
|
---|
[2725] | 581 | add_fd_to_set(fd);
|
---|
| 582 | sep->se_fd = fd;
|
---|
[821] | 583 | }
|
---|
| 584 |
|
---|
[2725] | 585 | static int reopen_config_file(void)
|
---|
[821] | 586 | {
|
---|
[2725] | 587 | free(default_local_hostname);
|
---|
| 588 | default_local_hostname = xstrdup("*");
|
---|
| 589 | if (parser != NULL)
|
---|
| 590 | config_close(parser);
|
---|
| 591 | parser = config_open(config_filename);
|
---|
| 592 | return (parser != NULL);
|
---|
[821] | 593 | }
|
---|
| 594 |
|
---|
[2725] | 595 | static void close_config_file(void)
|
---|
[821] | 596 | {
|
---|
[2725] | 597 | if (parser) {
|
---|
| 598 | config_close(parser);
|
---|
| 599 | parser = NULL;
|
---|
[1765] | 600 | }
|
---|
[2725] | 601 | }
|
---|
[821] | 602 |
|
---|
[2725] | 603 | static void free_servtab_strings(servtab_t *cp)
|
---|
| 604 | {
|
---|
| 605 | int i;
|
---|
[821] | 606 |
|
---|
[2725] | 607 | free(cp->se_local_hostname);
|
---|
| 608 | free(cp->se_service);
|
---|
| 609 | free(cp->se_proto);
|
---|
| 610 | free(cp->se_user);
|
---|
| 611 | free(cp->se_group);
|
---|
| 612 | free(cp->se_lsa); /* not a string in fact */
|
---|
| 613 | free(cp->se_program);
|
---|
| 614 | for (i = 0; i < MAXARGV; i++)
|
---|
| 615 | free(cp->se_argv[i]);
|
---|
[821] | 616 | }
|
---|
| 617 |
|
---|
| 618 | static servtab_t *new_servtab(void)
|
---|
| 619 | {
|
---|
[2725] | 620 | servtab_t *newtab = xzalloc(sizeof(servtab_t));
|
---|
| 621 | newtab->se_fd = -1; /* paranoia */
|
---|
| 622 | return newtab;
|
---|
[821] | 623 | }
|
---|
| 624 |
|
---|
[2725] | 625 | static servtab_t *dup_servtab(servtab_t *sep)
|
---|
[821] | 626 | {
|
---|
[1765] | 627 | servtab_t *newtab;
|
---|
| 628 | int argc;
|
---|
[821] | 629 |
|
---|
[1765] | 630 | newtab = new_servtab();
|
---|
[2725] | 631 | *newtab = *sep; /* struct copy */
|
---|
| 632 | /* deep-copying strings */
|
---|
| 633 | newtab->se_service = xstrdup(newtab->se_service);
|
---|
| 634 | newtab->se_proto = xstrdup(newtab->se_proto);
|
---|
| 635 | newtab->se_user = xstrdup(newtab->se_user);
|
---|
| 636 | newtab->se_group = xstrdup(newtab->se_group);
|
---|
| 637 | newtab->se_program = xstrdup(newtab->se_program);
|
---|
[1765] | 638 | for (argc = 0; argc <= MAXARGV; argc++)
|
---|
[2725] | 639 | newtab->se_argv[argc] = xstrdup(newtab->se_argv[argc]);
|
---|
| 640 | /* NB: se_fd, se_hostaddr and se_next are always
|
---|
| 641 | * overwrittend by callers, so we don't bother resetting them
|
---|
| 642 | * to NULL/0/-1 etc */
|
---|
[821] | 643 |
|
---|
[1765] | 644 | return newtab;
|
---|
[821] | 645 | }
|
---|
| 646 |
|
---|
[2725] | 647 | /* gcc generates much more code if this is inlined */
|
---|
| 648 | static servtab_t *parse_one_line(void)
|
---|
[821] | 649 | {
|
---|
[1765] | 650 | int argc;
|
---|
[2725] | 651 | char *token[6+MAXARGV];
|
---|
| 652 | char *p, *arg;
|
---|
[1765] | 653 | char *hostdelim;
|
---|
[2725] | 654 | servtab_t *sep;
|
---|
[1765] | 655 | servtab_t *nsep;
|
---|
[2725] | 656 | new:
|
---|
[1765] | 657 | sep = new_servtab();
|
---|
| 658 | more:
|
---|
[2725] | 659 | argc = config_read(parser, token, 6+MAXARGV, 1, "# \t", PARSE_NORMAL);
|
---|
| 660 | if (!argc) {
|
---|
| 661 | free(sep);
|
---|
[1765] | 662 | return NULL;
|
---|
| 663 | }
|
---|
[821] | 664 |
|
---|
[2725] | 665 | /* [host:]service socktype proto wait user[:group] prog [args] */
|
---|
| 666 | /* Check for "host:...." line */
|
---|
| 667 | arg = token[0];
|
---|
[1765] | 668 | hostdelim = strrchr(arg, ':');
|
---|
| 669 | if (hostdelim) {
|
---|
| 670 | *hostdelim = '\0';
|
---|
[2725] | 671 | sep->se_local_hostname = xstrdup(arg);
|
---|
[1765] | 672 | arg = hostdelim + 1;
|
---|
[2725] | 673 | if (*arg == '\0' && argc == 1) {
|
---|
| 674 | /* Line has just "host:", change the
|
---|
| 675 | * default host for the following lines. */
|
---|
| 676 | free(default_local_hostname);
|
---|
| 677 | default_local_hostname = sep->se_local_hostname;
|
---|
| 678 | goto more;
|
---|
[1765] | 679 | }
|
---|
| 680 | } else
|
---|
[2725] | 681 | sep->se_local_hostname = xstrdup(default_local_hostname);
|
---|
[821] | 682 |
|
---|
[2725] | 683 | /* service socktype proto wait user[:group] prog [args] */
|
---|
| 684 | sep->se_service = xstrdup(arg);
|
---|
[821] | 685 |
|
---|
[2725] | 686 | /* socktype proto wait user[:group] prog [args] */
|
---|
| 687 | if (argc < 6) {
|
---|
| 688 | parse_err:
|
---|
| 689 | bb_error_msg("parse error on line %u, line is ignored",
|
---|
| 690 | parser->lineno);
|
---|
| 691 | free_servtab_strings(sep);
|
---|
| 692 | /* Just "goto more" can make sep to carry over e.g.
|
---|
| 693 | * "rpc"-ness (by having se_rpcver_lo != 0).
|
---|
| 694 | * We will be more paranoid: */
|
---|
| 695 | free(sep);
|
---|
| 696 | goto new;
|
---|
| 697 | }
|
---|
[821] | 698 |
|
---|
[2725] | 699 | {
|
---|
| 700 | static const int8_t SOCK_xxx[] ALIGN1 = {
|
---|
| 701 | -1,
|
---|
| 702 | SOCK_STREAM, SOCK_DGRAM, SOCK_RDM,
|
---|
| 703 | SOCK_SEQPACKET, SOCK_RAW
|
---|
| 704 | };
|
---|
| 705 | sep->se_socktype = SOCK_xxx[1 + index_in_strings(
|
---|
| 706 | "stream""\0" "dgram""\0" "rdm""\0"
|
---|
| 707 | "seqpacket""\0" "raw""\0"
|
---|
| 708 | , token[1])];
|
---|
| 709 | }
|
---|
[1765] | 710 |
|
---|
[2725] | 711 | /* {unix,[rpc/]{tcp,udp}[6]} wait user[:group] prog [args] */
|
---|
| 712 | sep->se_proto = arg = xstrdup(token[2]);
|
---|
| 713 | if (strcmp(arg, "unix") == 0) {
|
---|
[1765] | 714 | sep->se_family = AF_UNIX;
|
---|
| 715 | } else {
|
---|
[2725] | 716 | char *six;
|
---|
[1765] | 717 | sep->se_family = AF_INET;
|
---|
[2725] | 718 | six = last_char_is(arg, '6');
|
---|
| 719 | if (six) {
|
---|
[1765] | 720 | #if ENABLE_FEATURE_IPV6
|
---|
[2725] | 721 | *six = '\0';
|
---|
[1765] | 722 | sep->se_family = AF_INET6;
|
---|
[821] | 723 | #else
|
---|
[2725] | 724 | bb_error_msg("%s: no support for IPv6", sep->se_proto);
|
---|
| 725 | goto parse_err;
|
---|
[821] | 726 | #endif
|
---|
[2725] | 727 | }
|
---|
| 728 | if (strncmp(arg, "rpc/", 4) == 0) {
|
---|
[1765] | 729 | #if ENABLE_FEATURE_INETD_RPC
|
---|
[2725] | 730 | unsigned n;
|
---|
| 731 | arg += 4;
|
---|
[1765] | 732 | p = strchr(sep->se_service, '/');
|
---|
[2725] | 733 | if (p == NULL) {
|
---|
| 734 | bb_error_msg("no rpc version: '%s'", sep->se_service);
|
---|
| 735 | goto parse_err;
|
---|
[1765] | 736 | }
|
---|
| 737 | *p++ = '\0';
|
---|
[2725] | 738 | n = bb_strtou(p, &p, 10);
|
---|
| 739 | if (n > INT_MAX) {
|
---|
| 740 | bad_ver_spec:
|
---|
| 741 | bb_error_msg("bad rpc version");
|
---|
| 742 | goto parse_err;
|
---|
[1765] | 743 | }
|
---|
[2725] | 744 | sep->se_rpcver_lo = sep->se_rpcver_hi = n;
|
---|
| 745 | if (*p == '-') {
|
---|
| 746 | p++;
|
---|
| 747 | n = bb_strtou(p, &p, 10);
|
---|
| 748 | if (n > INT_MAX || (int)n < sep->se_rpcver_lo)
|
---|
| 749 | goto bad_ver_spec;
|
---|
| 750 | sep->se_rpcver_hi = n;
|
---|
| 751 | }
|
---|
| 752 | if (*p != '\0')
|
---|
| 753 | goto bad_ver_spec;
|
---|
[821] | 754 | #else
|
---|
[2725] | 755 | bb_error_msg("no support for rpc services");
|
---|
| 756 | goto parse_err;
|
---|
[821] | 757 | #endif
|
---|
[1765] | 758 | }
|
---|
[2725] | 759 | /* we don't really need getprotobyname()! */
|
---|
| 760 | if (strcmp(arg, "tcp") == 0)
|
---|
| 761 | sep->se_proto_no = IPPROTO_TCP; /* = 6 */
|
---|
| 762 | if (strcmp(arg, "udp") == 0)
|
---|
| 763 | sep->se_proto_no = IPPROTO_UDP; /* = 17 */
|
---|
| 764 | if (six)
|
---|
| 765 | *six = '6';
|
---|
| 766 | if (!sep->se_proto_no) /* not tcp/udp?? */
|
---|
| 767 | goto parse_err;
|
---|
[821] | 768 | }
|
---|
| 769 |
|
---|
[2725] | 770 | /* [no]wait[.max] user[:group] prog [args] */
|
---|
| 771 | arg = token[3];
|
---|
| 772 | sep->se_max = max_concurrency;
|
---|
| 773 | p = strchr(arg, '.');
|
---|
| 774 | if (p) {
|
---|
| 775 | *p++ = '\0';
|
---|
| 776 | sep->se_max = bb_strtou(p, NULL, 10);
|
---|
| 777 | if (errno)
|
---|
| 778 | goto parse_err;
|
---|
[1765] | 779 | }
|
---|
[2725] | 780 | sep->se_wait = (arg[0] != 'n' || arg[1] != 'o');
|
---|
| 781 | if (!sep->se_wait) /* "no" seen */
|
---|
| 782 | arg += 2;
|
---|
| 783 | if (strcmp(arg, "wait") != 0)
|
---|
| 784 | goto parse_err;
|
---|
| 785 |
|
---|
| 786 | /* user[:group] prog [args] */
|
---|
| 787 | sep->se_user = xstrdup(token[4]);
|
---|
[1765] | 788 | arg = strchr(sep->se_user, '.');
|
---|
| 789 | if (arg == NULL)
|
---|
| 790 | arg = strchr(sep->se_user, ':');
|
---|
| 791 | if (arg) {
|
---|
| 792 | *arg++ = '\0';
|
---|
| 793 | sep->se_group = xstrdup(arg);
|
---|
| 794 | }
|
---|
[821] | 795 |
|
---|
[2725] | 796 | /* prog [args] */
|
---|
| 797 | sep->se_program = xstrdup(token[5]);
|
---|
| 798 | #ifdef INETD_BUILTINS_ENABLED
|
---|
| 799 | if (strcmp(sep->se_program, "internal") == 0
|
---|
| 800 | && strlen(sep->se_service) <= 7
|
---|
| 801 | && (sep->se_socktype == SOCK_STREAM
|
---|
| 802 | || sep->se_socktype == SOCK_DGRAM)
|
---|
| 803 | ) {
|
---|
| 804 | unsigned i;
|
---|
| 805 | for (i = 0; i < ARRAY_SIZE(builtins); i++)
|
---|
| 806 | if (strncmp(builtins[i].bi_service7, sep->se_service, 7) == 0)
|
---|
| 807 | goto found_bi;
|
---|
| 808 | bb_error_msg("unknown internal service %s", sep->se_service);
|
---|
| 809 | goto parse_err;
|
---|
| 810 | found_bi:
|
---|
| 811 | sep->se_builtin = &builtins[i];
|
---|
| 812 | /* stream builtins must be "nowait", dgram must be "wait" */
|
---|
| 813 | if (sep->se_wait != (sep->se_socktype == SOCK_DGRAM))
|
---|
| 814 | goto parse_err;
|
---|
[1765] | 815 | }
|
---|
[821] | 816 | #endif
|
---|
[1765] | 817 | argc = 0;
|
---|
[2725] | 818 | while ((arg = token[6+argc]) != NULL && argc < MAXARGV)
|
---|
| 819 | sep->se_argv[argc++] = xstrdup(arg);
|
---|
| 820 | /* Some inetd.conf files have no argv's, not even argv[0].
|
---|
| 821 | * Fix them up.
|
---|
| 822 | * (Technically, programs can be execed with argv[0] = NULL,
|
---|
| 823 | * but many programs do not like that at all) */
|
---|
| 824 | if (argc == 0)
|
---|
| 825 | sep->se_argv[0] = xstrdup(sep->se_program);
|
---|
| 826 |
|
---|
| 827 | /* catch mixups. "<service> stream udp ..." == wtf */
|
---|
| 828 | if (sep->se_socktype == SOCK_STREAM) {
|
---|
| 829 | if (sep->se_proto_no == IPPROTO_UDP)
|
---|
| 830 | goto parse_err;
|
---|
[1765] | 831 | }
|
---|
[2725] | 832 | if (sep->se_socktype == SOCK_DGRAM) {
|
---|
| 833 | if (sep->se_proto_no == IPPROTO_TCP)
|
---|
| 834 | goto parse_err;
|
---|
| 835 | }
|
---|
[821] | 836 |
|
---|
[2725] | 837 | // bb_info_msg(
|
---|
| 838 | // "ENTRY[%s][%s][%s][%d][%d][%d][%d][%d][%s][%s][%s]",
|
---|
| 839 | // sep->se_local_hostname, sep->se_service, sep->se_proto, sep->se_wait, sep->se_proto_no,
|
---|
| 840 | // sep->se_max, sep->se_count, sep->se_time, sep->se_user, sep->se_group, sep->se_program);
|
---|
[821] | 841 |
|
---|
[2725] | 842 | /* check if the hostname specifier is a comma separated list
|
---|
| 843 | * of hostnames. we'll make new entries for each address. */
|
---|
| 844 | while ((hostdelim = strrchr(sep->se_local_hostname, ',')) != NULL) {
|
---|
| 845 | nsep = dup_servtab(sep);
|
---|
| 846 | /* NUL terminate the hostname field of the existing entry,
|
---|
| 847 | * and make a dup for the new entry. */
|
---|
[1765] | 848 | *hostdelim++ = '\0';
|
---|
[2725] | 849 | nsep->se_local_hostname = xstrdup(hostdelim);
|
---|
[1765] | 850 | nsep->se_next = sep->se_next;
|
---|
| 851 | sep->se_next = nsep;
|
---|
| 852 | }
|
---|
[821] | 853 |
|
---|
[2725] | 854 | /* was doing it here: */
|
---|
| 855 | /* DNS resolution, create copies for each IP address */
|
---|
| 856 | /* IPv6-ization destroyed it :( */
|
---|
[821] | 857 |
|
---|
[1765] | 858 | return sep;
|
---|
[821] | 859 | }
|
---|
| 860 |
|
---|
[2725] | 861 | static servtab_t *insert_in_servlist(servtab_t *cp)
|
---|
[821] | 862 | {
|
---|
[1765] | 863 | servtab_t *sep;
|
---|
| 864 | sigset_t omask;
|
---|
[821] | 865 |
|
---|
[1765] | 866 | sep = new_servtab();
|
---|
[2725] | 867 | *sep = *cp; /* struct copy */
|
---|
[1765] | 868 | sep->se_fd = -1;
|
---|
| 869 | #if ENABLE_FEATURE_INETD_RPC
|
---|
| 870 | sep->se_rpcprog = -1;
|
---|
[821] | 871 | #endif
|
---|
[2725] | 872 | block_CHLD_HUP_ALRM(&omask);
|
---|
| 873 | sep->se_next = serv_list;
|
---|
| 874 | serv_list = sep;
|
---|
| 875 | restore_sigmask(&omask);
|
---|
[1765] | 876 | return sep;
|
---|
[821] | 877 | }
|
---|
| 878 |
|
---|
[2725] | 879 | static int same_serv_addr_proto(servtab_t *old, servtab_t *new)
|
---|
[821] | 880 | {
|
---|
[2725] | 881 | if (strcmp(old->se_local_hostname, new->se_local_hostname) != 0)
|
---|
| 882 | return 0;
|
---|
[1765] | 883 | if (strcmp(old->se_service, new->se_service) != 0)
|
---|
| 884 | return 0;
|
---|
| 885 | if (strcmp(old->se_proto, new->se_proto) != 0)
|
---|
| 886 | return 0;
|
---|
| 887 | return 1;
|
---|
[821] | 888 | }
|
---|
| 889 |
|
---|
[2725] | 890 | static void reread_config_file(int sig UNUSED_PARAM)
|
---|
[821] | 891 | {
|
---|
[1765] | 892 | servtab_t *sep, *cp, **sepp;
|
---|
[2725] | 893 | len_and_sockaddr *lsa;
|
---|
[1765] | 894 | sigset_t omask;
|
---|
[2725] | 895 | unsigned n;
|
---|
| 896 | uint16_t port;
|
---|
| 897 | int save_errno = errno;
|
---|
[821] | 898 |
|
---|
[2725] | 899 | if (!reopen_config_file())
|
---|
| 900 | goto ret;
|
---|
| 901 | for (sep = serv_list; sep; sep = sep->se_next)
|
---|
[1765] | 902 | sep->se_checked = 0;
|
---|
[2725] | 903 |
|
---|
| 904 | goto first_line;
|
---|
| 905 | while (1) {
|
---|
| 906 | if (cp == NULL) {
|
---|
| 907 | first_line:
|
---|
| 908 | cp = parse_one_line();
|
---|
| 909 | if (cp == NULL)
|
---|
[1765] | 910 | break;
|
---|
[2725] | 911 | }
|
---|
| 912 | for (sep = serv_list; sep; sep = sep->se_next)
|
---|
| 913 | if (same_serv_addr_proto(sep, cp))
|
---|
| 914 | goto equal_servtab;
|
---|
| 915 | /* not an "equal" servtab */
|
---|
| 916 | sep = insert_in_servlist(cp);
|
---|
| 917 | goto after_check;
|
---|
| 918 | equal_servtab:
|
---|
| 919 | {
|
---|
[1765] | 920 | int i;
|
---|
| 921 |
|
---|
[2725] | 922 | block_CHLD_HUP_ALRM(&omask);
|
---|
| 923 | #if ENABLE_FEATURE_INETD_RPC
|
---|
| 924 | if (is_rpc_service(sep))
|
---|
| 925 | unregister_rpc(sep);
|
---|
| 926 | sep->se_rpcver_lo = cp->se_rpcver_lo;
|
---|
| 927 | sep->se_rpcver_hi = cp->se_rpcver_hi;
|
---|
[821] | 928 | #endif
|
---|
[2725] | 929 | if (cp->se_wait == 0) {
|
---|
| 930 | /* New config says "nowait". If old one
|
---|
| 931 | * was "wait", we currently may be waiting
|
---|
| 932 | * for a child (and not accepting connects).
|
---|
| 933 | * Stop waiting, start listening again.
|
---|
| 934 | * (if it's not true, this op is harmless) */
|
---|
| 935 | add_fd_to_set(sep->se_fd);
|
---|
| 936 | }
|
---|
| 937 | sep->se_wait = cp->se_wait;
|
---|
| 938 | sep->se_max = cp->se_max;
|
---|
| 939 | /* string fields need more love - we don't want to leak them */
|
---|
| 940 | #define SWAP(type, a, b) do { type c = (type)a; a = (type)b; b = (type)c; } while (0)
|
---|
| 941 | SWAP(char*, sep->se_user, cp->se_user);
|
---|
| 942 | SWAP(char*, sep->se_group, cp->se_group);
|
---|
| 943 | SWAP(char*, sep->se_program, cp->se_program);
|
---|
[1765] | 944 | for (i = 0; i < MAXARGV; i++)
|
---|
[2725] | 945 | SWAP(char*, sep->se_argv[i], cp->se_argv[i]);
|
---|
[821] | 946 | #undef SWAP
|
---|
[2725] | 947 | restore_sigmask(&omask);
|
---|
| 948 | free_servtab_strings(cp);
|
---|
[1765] | 949 | }
|
---|
[2725] | 950 | after_check:
|
---|
| 951 | /* cp->string_fields are consumed by insert_in_servlist()
|
---|
| 952 | * or freed at this point, cp itself is not yet freed. */
|
---|
[1765] | 953 | sep->se_checked = 1;
|
---|
[821] | 954 |
|
---|
[2725] | 955 | /* create new len_and_sockaddr */
|
---|
[1765] | 956 | switch (sep->se_family) {
|
---|
[2725] | 957 | struct sockaddr_un *sun;
|
---|
[1765] | 958 | case AF_UNIX:
|
---|
[2725] | 959 | lsa = xzalloc_lsa(AF_UNIX);
|
---|
| 960 | sun = (struct sockaddr_un*)&lsa->u.sa;
|
---|
| 961 | safe_strncpy(sun->sun_path, sep->se_service, sizeof(sun->sun_path));
|
---|
[1765] | 962 | break;
|
---|
[821] | 963 |
|
---|
[2725] | 964 | default: /* case AF_INET, case AF_INET6 */
|
---|
| 965 | n = bb_strtou(sep->se_service, NULL, 10);
|
---|
[1765] | 966 | #if ENABLE_FEATURE_INETD_RPC
|
---|
[2725] | 967 | if (is_rpc_service(sep)) {
|
---|
| 968 | sep->se_rpcprog = n;
|
---|
| 969 | if (errno) { /* se_service is not numeric */
|
---|
| 970 | struct rpcent *rp = getrpcbyname(sep->se_service);
|
---|
| 971 | if (rp == NULL) {
|
---|
[1765] | 972 | bb_error_msg("%s: unknown rpc service", sep->se_service);
|
---|
[2725] | 973 | goto next_cp;
|
---|
[1765] | 974 | }
|
---|
| 975 | sep->se_rpcprog = rp->r_number;
|
---|
| 976 | }
|
---|
| 977 | if (sep->se_fd == -1)
|
---|
[2725] | 978 | prepare_socket_fd(sep);
|
---|
[1765] | 979 | if (sep->se_fd != -1)
|
---|
| 980 | register_rpc(sep);
|
---|
[2725] | 981 | goto next_cp;
|
---|
| 982 | }
|
---|
[821] | 983 | #endif
|
---|
[2725] | 984 | /* what port to listen on? */
|
---|
| 985 | port = htons(n);
|
---|
| 986 | if (errno || n > 0xffff) { /* se_service is not numeric */
|
---|
| 987 | char protoname[4];
|
---|
| 988 | struct servent *sp;
|
---|
| 989 | /* can result only in "tcp" or "udp": */
|
---|
| 990 | safe_strncpy(protoname, sep->se_proto, 4);
|
---|
| 991 | sp = getservbyname(sep->se_service, protoname);
|
---|
| 992 | if (sp == NULL) {
|
---|
| 993 | bb_error_msg("%s/%s: unknown service",
|
---|
| 994 | sep->se_service, sep->se_proto);
|
---|
| 995 | goto next_cp;
|
---|
[1765] | 996 | }
|
---|
[2725] | 997 | port = sp->s_port;
|
---|
[1765] | 998 | }
|
---|
[2725] | 999 | if (LONE_CHAR(sep->se_local_hostname, '*')) {
|
---|
| 1000 | lsa = xzalloc_lsa(sep->se_family);
|
---|
[3232] | 1001 | set_nport(&lsa->u.sa, port);
|
---|
[2725] | 1002 | } else {
|
---|
| 1003 | lsa = host_and_af2sockaddr(sep->se_local_hostname,
|
---|
| 1004 | ntohs(port), sep->se_family);
|
---|
| 1005 | if (!lsa) {
|
---|
| 1006 | bb_error_msg("%s/%s: unknown host '%s'",
|
---|
| 1007 | sep->se_service, sep->se_proto,
|
---|
| 1008 | sep->se_local_hostname);
|
---|
| 1009 | goto next_cp;
|
---|
[1765] | 1010 | }
|
---|
| 1011 | }
|
---|
| 1012 | break;
|
---|
[2725] | 1013 | } /* end of "switch (sep->se_family)" */
|
---|
[821] | 1014 |
|
---|
[2725] | 1015 | /* did lsa change? Then close/open */
|
---|
| 1016 | if (sep->se_lsa == NULL
|
---|
| 1017 | || lsa->len != sep->se_lsa->len
|
---|
| 1018 | || memcmp(&lsa->u.sa, &sep->se_lsa->u.sa, lsa->len) != 0
|
---|
| 1019 | ) {
|
---|
| 1020 | remove_fd_from_set(sep->se_fd);
|
---|
| 1021 | maybe_close(sep->se_fd);
|
---|
| 1022 | free(sep->se_lsa);
|
---|
| 1023 | sep->se_lsa = lsa;
|
---|
| 1024 | sep->se_fd = -1;
|
---|
[1765] | 1025 | } else {
|
---|
[2725] | 1026 | free(lsa);
|
---|
[821] | 1027 | }
|
---|
[2725] | 1028 | if (sep->se_fd == -1)
|
---|
| 1029 | prepare_socket_fd(sep);
|
---|
| 1030 | next_cp:
|
---|
| 1031 | sep = cp->se_next;
|
---|
| 1032 | free(cp);
|
---|
| 1033 | cp = sep;
|
---|
| 1034 | } /* end of "while (1) parse lines" */
|
---|
| 1035 | close_config_file();
|
---|
| 1036 |
|
---|
| 1037 | /* Purge anything not looked at above - these are stale entries,
|
---|
| 1038 | * new config file doesnt have them. */
|
---|
| 1039 | block_CHLD_HUP_ALRM(&omask);
|
---|
| 1040 | sepp = &serv_list;
|
---|
[3232] | 1041 | while ((sep = *sepp) != NULL) {
|
---|
[1765] | 1042 | if (sep->se_checked) {
|
---|
| 1043 | sepp = &sep->se_next;
|
---|
| 1044 | continue;
|
---|
| 1045 | }
|
---|
| 1046 | *sepp = sep->se_next;
|
---|
[2725] | 1047 | remove_fd_from_set(sep->se_fd);
|
---|
| 1048 | maybe_close(sep->se_fd);
|
---|
[1765] | 1049 | #if ENABLE_FEATURE_INETD_RPC
|
---|
[2725] | 1050 | if (is_rpc_service(sep))
|
---|
[1765] | 1051 | unregister_rpc(sep);
|
---|
| 1052 | #endif
|
---|
| 1053 | if (sep->se_family == AF_UNIX)
|
---|
[2725] | 1054 | unlink(sep->se_service);
|
---|
| 1055 | free_servtab_strings(sep);
|
---|
[1765] | 1056 | free(sep);
|
---|
[821] | 1057 | }
|
---|
[2725] | 1058 | restore_sigmask(&omask);
|
---|
| 1059 | ret:
|
---|
| 1060 | errno = save_errno;
|
---|
[821] | 1061 | }
|
---|
| 1062 |
|
---|
[2725] | 1063 | static void reap_child(int sig UNUSED_PARAM)
|
---|
[821] | 1064 | {
|
---|
[1765] | 1065 | pid_t pid;
|
---|
[2725] | 1066 | int status;
|
---|
[1765] | 1067 | servtab_t *sep;
|
---|
[2725] | 1068 | int save_errno = errno;
|
---|
[821] | 1069 |
|
---|
[1765] | 1070 | for (;;) {
|
---|
[2725] | 1071 | pid = wait_any_nohang(&status);
|
---|
[1765] | 1072 | if (pid <= 0)
|
---|
| 1073 | break;
|
---|
[2725] | 1074 | for (sep = serv_list; sep; sep = sep->se_next) {
|
---|
| 1075 | if (sep->se_wait != pid)
|
---|
| 1076 | continue;
|
---|
| 1077 | /* One of our "wait" services */
|
---|
| 1078 | if (WIFEXITED(status) && WEXITSTATUS(status))
|
---|
| 1079 | bb_error_msg("%s: exit status %u",
|
---|
| 1080 | sep->se_program, WEXITSTATUS(status));
|
---|
| 1081 | else if (WIFSIGNALED(status))
|
---|
| 1082 | bb_error_msg("%s: exit signal %u",
|
---|
| 1083 | sep->se_program, WTERMSIG(status));
|
---|
| 1084 | sep->se_wait = 1;
|
---|
| 1085 | add_fd_to_set(sep->se_fd);
|
---|
| 1086 | break;
|
---|
| 1087 | }
|
---|
[1765] | 1088 | }
|
---|
| 1089 | errno = save_errno;
|
---|
[821] | 1090 | }
|
---|
| 1091 |
|
---|
[2725] | 1092 | static void retry_network_setup(int sig UNUSED_PARAM)
|
---|
[821] | 1093 | {
|
---|
[2725] | 1094 | int save_errno = errno;
|
---|
[1765] | 1095 | servtab_t *sep;
|
---|
[821] | 1096 |
|
---|
[2725] | 1097 | alarm_armed = 0;
|
---|
| 1098 | for (sep = serv_list; sep; sep = sep->se_next) {
|
---|
[1765] | 1099 | if (sep->se_fd == -1) {
|
---|
[2725] | 1100 | prepare_socket_fd(sep);
|
---|
[1765] | 1101 | #if ENABLE_FEATURE_INETD_RPC
|
---|
[2725] | 1102 | if (sep->se_fd != -1 && is_rpc_service(sep))
|
---|
| 1103 | register_rpc(sep);
|
---|
[821] | 1104 | #endif
|
---|
[1765] | 1105 | }
|
---|
[821] | 1106 | }
|
---|
[2725] | 1107 | errno = save_errno;
|
---|
[821] | 1108 | }
|
---|
| 1109 |
|
---|
[2725] | 1110 | static void clean_up_and_exit(int sig UNUSED_PARAM)
|
---|
[821] | 1111 | {
|
---|
[1765] | 1112 | servtab_t *sep;
|
---|
[821] | 1113 |
|
---|
[1765] | 1114 | /* XXX signal race walking sep list */
|
---|
[2725] | 1115 | for (sep = serv_list; sep; sep = sep->se_next) {
|
---|
[1765] | 1116 | if (sep->se_fd == -1)
|
---|
| 1117 | continue;
|
---|
[821] | 1118 |
|
---|
[1765] | 1119 | switch (sep->se_family) {
|
---|
| 1120 | case AF_UNIX:
|
---|
[2725] | 1121 | unlink(sep->se_service);
|
---|
[1765] | 1122 | break;
|
---|
[2725] | 1123 | default: /* case AF_INET, AF_INET6 */
|
---|
[1765] | 1124 | #if ENABLE_FEATURE_INETD_RPC
|
---|
[2725] | 1125 | if (sep->se_wait == 1 && is_rpc_service(sep))
|
---|
[1765] | 1126 | unregister_rpc(sep); /* XXX signal race */
|
---|
[821] | 1127 | #endif
|
---|
[1765] | 1128 | break;
|
---|
| 1129 | }
|
---|
[2725] | 1130 | if (ENABLE_FEATURE_CLEAN_UP)
|
---|
| 1131 | close(sep->se_fd);
|
---|
[821] | 1132 | }
|
---|
[3232] | 1133 | remove_pidfile(CONFIG_PID_FILE_PATH "/inetd.pid");
|
---|
[2725] | 1134 | exit(EXIT_SUCCESS);
|
---|
[821] | 1135 | }
|
---|
| 1136 |
|
---|
[2725] | 1137 | int inetd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
| 1138 | int inetd_main(int argc UNUSED_PARAM, char **argv)
|
---|
[821] | 1139 | {
|
---|
[2725] | 1140 | struct sigaction sa, saved_pipe_handler;
|
---|
| 1141 | servtab_t *sep, *sep2;
|
---|
[1765] | 1142 | struct passwd *pwd;
|
---|
[2725] | 1143 | struct group *grp = grp; /* for compiler */
|
---|
[1765] | 1144 | int opt;
|
---|
| 1145 | pid_t pid;
|
---|
[2725] | 1146 | sigset_t omask;
|
---|
[821] | 1147 |
|
---|
[2725] | 1148 | INIT_G();
|
---|
[821] | 1149 |
|
---|
[2725] | 1150 | real_uid = getuid();
|
---|
| 1151 | if (real_uid != 0) /* run by non-root user */
|
---|
[1765] | 1152 | config_filename = NULL;
|
---|
[821] | 1153 |
|
---|
[2725] | 1154 | opt_complementary = "R+:q+"; /* -q N, -R N */
|
---|
| 1155 | opt = getopt32(argv, "R:feq:", &max_concurrency, &global_queuelen);
|
---|
[1765] | 1156 | argv += optind;
|
---|
[2725] | 1157 | //argc -= optind;
|
---|
| 1158 | if (argv[0])
|
---|
[1765] | 1159 | config_filename = argv[0];
|
---|
| 1160 | if (config_filename == NULL)
|
---|
[2725] | 1161 | bb_error_msg_and_die("non-root must specify config file");
|
---|
[1765] | 1162 | if (!(opt & 2))
|
---|
| 1163 | bb_daemonize_or_rexec(0, argv - optind);
|
---|
| 1164 | else
|
---|
| 1165 | bb_sanitize_stdio();
|
---|
[2725] | 1166 | if (!(opt & 4)) {
|
---|
| 1167 | /* LOG_NDELAY: connect to syslog daemon NOW.
|
---|
| 1168 | * Otherwise, we may open syslog socket
|
---|
| 1169 | * in vforked child, making opened fds and syslog()
|
---|
| 1170 | * internal state inconsistent.
|
---|
| 1171 | * This was observed to leak file descriptors. */
|
---|
| 1172 | openlog(applet_name, LOG_PID | LOG_NDELAY, LOG_DAEMON);
|
---|
| 1173 | logmode = LOGMODE_SYSLOG;
|
---|
| 1174 | }
|
---|
[1765] | 1175 |
|
---|
[2725] | 1176 | if (real_uid == 0) {
|
---|
| 1177 | /* run by root, ensure groups vector gets trashed */
|
---|
[1765] | 1178 | gid_t gid = getgid();
|
---|
| 1179 | setgroups(1, &gid);
|
---|
[821] | 1180 | }
|
---|
| 1181 |
|
---|
[3232] | 1182 | write_pidfile(CONFIG_PID_FILE_PATH "/inetd.pid");
|
---|
[821] | 1183 |
|
---|
[2725] | 1184 | /* never fails under Linux (except if you pass it bad arguments) */
|
---|
| 1185 | getrlimit(RLIMIT_NOFILE, &rlim_ofile);
|
---|
| 1186 | rlim_ofile_cur = rlim_ofile.rlim_cur;
|
---|
| 1187 | if (rlim_ofile_cur == RLIM_INFINITY) /* ! */
|
---|
| 1188 | rlim_ofile_cur = OPEN_MAX;
|
---|
[821] | 1189 |
|
---|
[2725] | 1190 | memset(&sa, 0, sizeof(sa));
|
---|
| 1191 | /*sigemptyset(&sa.sa_mask); - memset did it */
|
---|
[1765] | 1192 | sigaddset(&sa.sa_mask, SIGALRM);
|
---|
| 1193 | sigaddset(&sa.sa_mask, SIGCHLD);
|
---|
| 1194 | sigaddset(&sa.sa_mask, SIGHUP);
|
---|
[3232] | 1195 | //FIXME: explain why no SA_RESTART
|
---|
| 1196 | //FIXME: retry_network_setup is unsafe to run in signal handler (many reasons)!
|
---|
[2725] | 1197 | sa.sa_handler = retry_network_setup;
|
---|
| 1198 | sigaction_set(SIGALRM, &sa);
|
---|
[3232] | 1199 | //FIXME: reread_config_file is unsafe to run in signal handler(many reasons)!
|
---|
[2725] | 1200 | sa.sa_handler = reread_config_file;
|
---|
| 1201 | sigaction_set(SIGHUP, &sa);
|
---|
[3232] | 1202 | //FIXME: reap_child is unsafe to run in signal handler (uses stdio)!
|
---|
[2725] | 1203 | sa.sa_handler = reap_child;
|
---|
| 1204 | sigaction_set(SIGCHLD, &sa);
|
---|
[3232] | 1205 | //FIXME: clean_up_and_exit is unsafe to run in signal handler (uses stdio)!
|
---|
[2725] | 1206 | sa.sa_handler = clean_up_and_exit;
|
---|
| 1207 | sigaction_set(SIGTERM, &sa);
|
---|
| 1208 | sa.sa_handler = clean_up_and_exit;
|
---|
| 1209 | sigaction_set(SIGINT, &sa);
|
---|
[1765] | 1210 | sa.sa_handler = SIG_IGN;
|
---|
[2725] | 1211 | sigaction(SIGPIPE, &sa, &saved_pipe_handler);
|
---|
[821] | 1212 |
|
---|
[2725] | 1213 | reread_config_file(SIGHUP); /* load config from file */
|
---|
[821] | 1214 |
|
---|
[1765] | 1215 | for (;;) {
|
---|
[2725] | 1216 | int ready_fd_cnt;
|
---|
| 1217 | int ctrl, accepted_fd, new_udp_fd;
|
---|
[1765] | 1218 | fd_set readable;
|
---|
[821] | 1219 |
|
---|
[2725] | 1220 | if (maxsock < 0)
|
---|
| 1221 | recalculate_maxsock();
|
---|
[821] | 1222 |
|
---|
[2725] | 1223 | readable = allsock; /* struct copy */
|
---|
| 1224 | /* if there are no fds to wait on, we will block
|
---|
| 1225 | * until signal wakes us up (maxsock == 0, but readable
|
---|
| 1226 | * never contains fds 0 and 1...) */
|
---|
| 1227 | ready_fd_cnt = select(maxsock + 1, &readable, NULL, NULL, NULL);
|
---|
| 1228 | if (ready_fd_cnt < 0) {
|
---|
| 1229 | if (errno != EINTR) {
|
---|
[1765] | 1230 | bb_perror_msg("select");
|
---|
| 1231 | sleep(1);
|
---|
| 1232 | }
|
---|
| 1233 | continue;
|
---|
| 1234 | }
|
---|
[3232] | 1235 | dbg("ready_fd_cnt:%d\n", ready_fd_cnt);
|
---|
[821] | 1236 |
|
---|
[2725] | 1237 | for (sep = serv_list; ready_fd_cnt && sep; sep = sep->se_next) {
|
---|
[1765] | 1238 | if (sep->se_fd == -1 || !FD_ISSET(sep->se_fd, &readable))
|
---|
| 1239 | continue;
|
---|
[821] | 1240 |
|
---|
[3232] | 1241 | dbg("ready fd:%d\n", sep->se_fd);
|
---|
[2725] | 1242 | ready_fd_cnt--;
|
---|
| 1243 | ctrl = sep->se_fd;
|
---|
| 1244 | accepted_fd = -1;
|
---|
| 1245 | new_udp_fd = -1;
|
---|
| 1246 | if (!sep->se_wait) {
|
---|
| 1247 | if (sep->se_socktype == SOCK_STREAM) {
|
---|
| 1248 | ctrl = accepted_fd = accept(sep->se_fd, NULL, NULL);
|
---|
[3232] | 1249 | dbg("accepted_fd:%d\n", accepted_fd);
|
---|
[2725] | 1250 | if (ctrl < 0) {
|
---|
| 1251 | if (errno != EINTR)
|
---|
| 1252 | bb_perror_msg("accept (for %s)", sep->se_service);
|
---|
[1765] | 1253 | continue;
|
---|
[2725] | 1254 | }
|
---|
[1765] | 1255 | }
|
---|
[2725] | 1256 | /* "nowait" udp */
|
---|
| 1257 | if (sep->se_socktype == SOCK_DGRAM
|
---|
| 1258 | && sep->se_family != AF_UNIX
|
---|
| 1259 | ) {
|
---|
| 1260 | /* How udp "nowait" works:
|
---|
| 1261 | * child peeks at (received and buffered by kernel) UDP packet,
|
---|
| 1262 | * performs connect() on the socket so that it is linked only
|
---|
| 1263 | * to this peer. But this also affects parent, because descriptors
|
---|
| 1264 | * are shared after fork() a-la dup(). When parent performs
|
---|
| 1265 | * select(), it will see this descriptor connected to the peer (!)
|
---|
| 1266 | * and still readable, will act on it and mess things up
|
---|
| 1267 | * (can create many copies of same child, etc).
|
---|
| 1268 | * Parent must create and use new socket instead. */
|
---|
| 1269 | new_udp_fd = socket(sep->se_family, SOCK_DGRAM, 0);
|
---|
[3232] | 1270 | dbg("new_udp_fd:%d\n", new_udp_fd);
|
---|
[2725] | 1271 | if (new_udp_fd < 0) { /* error: eat packet, forget about it */
|
---|
| 1272 | udp_err:
|
---|
| 1273 | recv(sep->se_fd, line, LINE_SIZE, MSG_DONTWAIT);
|
---|
[1765] | 1274 | continue;
|
---|
| 1275 | }
|
---|
[2725] | 1276 | setsockopt_reuseaddr(new_udp_fd);
|
---|
[3232] | 1277 | /* TODO: better do bind after fork in parent,
|
---|
[2725] | 1278 | * so that we don't have two wildcard bound sockets
|
---|
| 1279 | * even for a brief moment? */
|
---|
| 1280 | if (bind(new_udp_fd, &sep->se_lsa->u.sa, sep->se_lsa->len) < 0) {
|
---|
[3232] | 1281 | dbg("bind(new_udp_fd) failed\n");
|
---|
[2725] | 1282 | close(new_udp_fd);
|
---|
| 1283 | goto udp_err;
|
---|
[1765] | 1284 | }
|
---|
[3232] | 1285 | dbg("bind(new_udp_fd) succeeded\n");
|
---|
[1765] | 1286 | }
|
---|
[2725] | 1287 | }
|
---|
[821] | 1288 |
|
---|
[2725] | 1289 | block_CHLD_HUP_ALRM(&omask);
|
---|
[1765] | 1290 | pid = 0;
|
---|
[2725] | 1291 | #ifdef INETD_BUILTINS_ENABLED
|
---|
| 1292 | /* do we need to fork? */
|
---|
| 1293 | if (sep->se_builtin == NULL
|
---|
| 1294 | || (sep->se_socktype == SOCK_STREAM
|
---|
| 1295 | && sep->se_builtin->bi_fork))
|
---|
[821] | 1296 | #endif
|
---|
[1765] | 1297 | {
|
---|
[2725] | 1298 | if (sep->se_max != 0) {
|
---|
| 1299 | if (++sep->se_count == 1)
|
---|
| 1300 | sep->se_time = monotonic_sec();
|
---|
| 1301 | else if (sep->se_count >= sep->se_max) {
|
---|
| 1302 | unsigned now = monotonic_sec();
|
---|
| 1303 | /* did we accumulate se_max connects too quickly? */
|
---|
| 1304 | if (now - sep->se_time <= CNT_INTERVAL) {
|
---|
| 1305 | bb_error_msg("%s/%s: too many connections, pausing",
|
---|
| 1306 | sep->se_service, sep->se_proto);
|
---|
| 1307 | remove_fd_from_set(sep->se_fd);
|
---|
| 1308 | close(sep->se_fd);
|
---|
| 1309 | sep->se_fd = -1;
|
---|
| 1310 | sep->se_count = 0;
|
---|
| 1311 | rearm_alarm(); /* will revive it in RETRYTIME sec */
|
---|
| 1312 | restore_sigmask(&omask);
|
---|
[3232] | 1313 | maybe_close(new_udp_fd);
|
---|
[2725] | 1314 | maybe_close(accepted_fd);
|
---|
| 1315 | continue; /* -> check next fd in fd set */
|
---|
[1765] | 1316 | }
|
---|
| 1317 | sep->se_count = 0;
|
---|
| 1318 | }
|
---|
| 1319 | }
|
---|
[2725] | 1320 | /* on NOMMU, streamed chargen
|
---|
| 1321 | * builtin wouldn't work, but it is
|
---|
| 1322 | * not allowed on NOMMU (ifdefed out) */
|
---|
| 1323 | #ifdef INETD_BUILTINS_ENABLED
|
---|
| 1324 | if (BB_MMU && sep->se_builtin)
|
---|
| 1325 | pid = fork();
|
---|
| 1326 | else
|
---|
| 1327 | #endif
|
---|
| 1328 | pid = vfork();
|
---|
| 1329 |
|
---|
| 1330 | if (pid < 0) { /* fork error */
|
---|
| 1331 | bb_perror_msg("vfork"+1);
|
---|
| 1332 | sleep(1);
|
---|
| 1333 | restore_sigmask(&omask);
|
---|
[3232] | 1334 | maybe_close(new_udp_fd);
|
---|
[2725] | 1335 | maybe_close(accepted_fd);
|
---|
| 1336 | continue; /* -> check next fd in fd set */
|
---|
| 1337 | }
|
---|
| 1338 | if (pid == 0)
|
---|
| 1339 | pid--; /* -1: "we did fork and we are child" */
|
---|
[1765] | 1340 | }
|
---|
[3232] | 1341 | /* if pid == 0 here, we didn't fork */
|
---|
[2725] | 1342 |
|
---|
| 1343 | if (pid > 0) { /* parent */
|
---|
| 1344 | if (sep->se_wait) {
|
---|
[3232] | 1345 | /* wait: we passed socket to child,
|
---|
[2725] | 1346 | * will wait for child to terminate */
|
---|
| 1347 | sep->se_wait = pid;
|
---|
| 1348 | remove_fd_from_set(sep->se_fd);
|
---|
| 1349 | }
|
---|
| 1350 | if (new_udp_fd >= 0) {
|
---|
| 1351 | /* udp nowait: child connected the socket,
|
---|
| 1352 | * we created and will use new, unconnected one */
|
---|
| 1353 | xmove_fd(new_udp_fd, sep->se_fd);
|
---|
[3232] | 1354 | dbg("moved new_udp_fd:%d to sep->se_fd:%d\n", new_udp_fd, sep->se_fd);
|
---|
[2725] | 1355 | }
|
---|
| 1356 | restore_sigmask(&omask);
|
---|
| 1357 | maybe_close(accepted_fd);
|
---|
| 1358 | continue; /* -> check next fd in fd set */
|
---|
[821] | 1359 | }
|
---|
[2725] | 1360 |
|
---|
[3232] | 1361 | /* we are either child or didn't fork at all */
|
---|
[2725] | 1362 | #ifdef INETD_BUILTINS_ENABLED
|
---|
| 1363 | if (sep->se_builtin) {
|
---|
[3232] | 1364 | if (pid) { /* "pid" is -1: we did fork */
|
---|
[2725] | 1365 | close(sep->se_fd); /* listening socket */
|
---|
[3232] | 1366 | dbg("closed sep->se_fd:%d\n", sep->se_fd);
|
---|
[2725] | 1367 | logmode = LOGMODE_NONE; /* make xwrite etc silent */
|
---|
| 1368 | }
|
---|
| 1369 | restore_sigmask(&omask);
|
---|
| 1370 | if (sep->se_socktype == SOCK_STREAM)
|
---|
| 1371 | sep->se_builtin->bi_stream_fn(ctrl, sep);
|
---|
| 1372 | else
|
---|
| 1373 | sep->se_builtin->bi_dgram_fn(ctrl, sep);
|
---|
[3232] | 1374 | if (pid) /* we did fork */
|
---|
[2725] | 1375 | _exit(EXIT_FAILURE);
|
---|
| 1376 | maybe_close(accepted_fd);
|
---|
| 1377 | continue; /* -> check next fd in fd set */
|
---|
[1765] | 1378 | }
|
---|
[821] | 1379 | #endif
|
---|
[2725] | 1380 | /* child */
|
---|
| 1381 | setsid();
|
---|
| 1382 | /* "nowait" udp */
|
---|
| 1383 | if (new_udp_fd >= 0) {
|
---|
[3232] | 1384 | len_and_sockaddr *lsa;
|
---|
| 1385 | int r;
|
---|
| 1386 |
|
---|
| 1387 | close(new_udp_fd);
|
---|
| 1388 | dbg("closed new_udp_fd:%d\n", new_udp_fd);
|
---|
| 1389 | lsa = xzalloc_lsa(sep->se_family);
|
---|
[2725] | 1390 | /* peek at the packet and remember peer addr */
|
---|
[3232] | 1391 | r = recvfrom(ctrl, NULL, 0, MSG_PEEK|MSG_DONTWAIT,
|
---|
[2725] | 1392 | &lsa->u.sa, &lsa->len);
|
---|
| 1393 | if (r < 0)
|
---|
| 1394 | goto do_exit1;
|
---|
| 1395 | /* make this socket "connected" to peer addr:
|
---|
| 1396 | * only packets from this peer will be recv'ed,
|
---|
| 1397 | * and bare write()/send() will work on it */
|
---|
| 1398 | connect(ctrl, &lsa->u.sa, lsa->len);
|
---|
[3232] | 1399 | dbg("connected ctrl:%d to remote peer\n", ctrl);
|
---|
[2725] | 1400 | free(lsa);
|
---|
| 1401 | }
|
---|
| 1402 | /* prepare env and exec program */
|
---|
| 1403 | pwd = getpwnam(sep->se_user);
|
---|
| 1404 | if (pwd == NULL) {
|
---|
| 1405 | bb_error_msg("%s: no such %s", sep->se_user, "user");
|
---|
| 1406 | goto do_exit1;
|
---|
| 1407 | }
|
---|
| 1408 | if (sep->se_group && (grp = getgrnam(sep->se_group)) == NULL) {
|
---|
| 1409 | bb_error_msg("%s: no such %s", sep->se_group, "group");
|
---|
| 1410 | goto do_exit1;
|
---|
| 1411 | }
|
---|
| 1412 | if (real_uid != 0 && real_uid != pwd->pw_uid) {
|
---|
| 1413 | /* a user running private inetd */
|
---|
| 1414 | bb_error_msg("non-root must run services as himself");
|
---|
| 1415 | goto do_exit1;
|
---|
| 1416 | }
|
---|
[3232] | 1417 | if (pwd->pw_uid != 0) {
|
---|
[2725] | 1418 | if (sep->se_group)
|
---|
| 1419 | pwd->pw_gid = grp->gr_gid;
|
---|
| 1420 | /* initgroups, setgid, setuid: */
|
---|
| 1421 | change_identity(pwd);
|
---|
| 1422 | } else if (sep->se_group) {
|
---|
| 1423 | xsetgid(grp->gr_gid);
|
---|
| 1424 | setgroups(1, &grp->gr_gid);
|
---|
| 1425 | }
|
---|
| 1426 | if (rlim_ofile.rlim_cur != rlim_ofile_cur)
|
---|
| 1427 | if (setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0)
|
---|
| 1428 | bb_perror_msg("setrlimit");
|
---|
| 1429 |
|
---|
| 1430 | /* closelog(); - WRONG. we are after vfork,
|
---|
| 1431 | * this may confuse syslog() internal state.
|
---|
| 1432 | * Let's hope libc sets syslog fd to CLOEXEC...
|
---|
| 1433 | */
|
---|
| 1434 | xmove_fd(ctrl, STDIN_FILENO);
|
---|
| 1435 | xdup2(STDIN_FILENO, STDOUT_FILENO);
|
---|
[3232] | 1436 | dbg("moved ctrl:%d to fd 0,1[,2]\n", ctrl);
|
---|
[2725] | 1437 | /* manpages of inetd I managed to find either say
|
---|
| 1438 | * that stderr is also redirected to the network,
|
---|
| 1439 | * or do not talk about redirection at all (!) */
|
---|
| 1440 | if (!sep->se_wait) /* only for usual "tcp nowait" */
|
---|
| 1441 | xdup2(STDIN_FILENO, STDERR_FILENO);
|
---|
| 1442 | /* NB: among others, this loop closes listening sockets
|
---|
| 1443 | * for nowait stream children */
|
---|
| 1444 | for (sep2 = serv_list; sep2; sep2 = sep2->se_next)
|
---|
| 1445 | if (sep2->se_fd != ctrl)
|
---|
| 1446 | maybe_close(sep2->se_fd);
|
---|
| 1447 | sigaction_set(SIGPIPE, &saved_pipe_handler);
|
---|
| 1448 | restore_sigmask(&omask);
|
---|
[3232] | 1449 | dbg("execing:'%s'\n", sep->se_program);
|
---|
[2725] | 1450 | BB_EXECVP(sep->se_program, sep->se_argv);
|
---|
| 1451 | bb_perror_msg("can't execute '%s'", sep->se_program);
|
---|
[1765] | 1452 | do_exit1:
|
---|
[2725] | 1453 | /* eat packet in udp case */
|
---|
| 1454 | if (sep->se_socktype != SOCK_STREAM)
|
---|
| 1455 | recv(0, line, LINE_SIZE, MSG_DONTWAIT);
|
---|
| 1456 | _exit(EXIT_FAILURE);
|
---|
[1765] | 1457 | } /* for (sep = servtab...) */
|
---|
| 1458 | } /* for (;;) */
|
---|
[821] | 1459 | }
|
---|
| 1460 |
|
---|
[2725] | 1461 | #if !BB_MMU
|
---|
| 1462 | static const char *const cat_args[] = { "cat", NULL };
|
---|
| 1463 | #endif
|
---|
| 1464 |
|
---|
[821] | 1465 | /*
|
---|
| 1466 | * Internet services provided internally by inetd:
|
---|
| 1467 | */
|
---|
[1765] | 1468 | #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
|
---|
[2725] | 1469 | /* Echo service -- echo data back. */
|
---|
[821] | 1470 | /* ARGSUSED */
|
---|
[2725] | 1471 | static void FAST_FUNC echo_stream(int s, servtab_t *sep UNUSED_PARAM)
|
---|
[821] | 1472 | {
|
---|
[2725] | 1473 | #if BB_MMU
|
---|
[1765] | 1474 | while (1) {
|
---|
[2725] | 1475 | ssize_t sz = safe_read(s, line, LINE_SIZE);
|
---|
| 1476 | if (sz <= 0)
|
---|
| 1477 | break;
|
---|
| 1478 | xwrite(s, line, sz);
|
---|
[1765] | 1479 | }
|
---|
[2725] | 1480 | #else
|
---|
| 1481 | /* We are after vfork here! */
|
---|
| 1482 | /* move network socket to stdin/stdout */
|
---|
| 1483 | xmove_fd(s, STDIN_FILENO);
|
---|
| 1484 | xdup2(STDIN_FILENO, STDOUT_FILENO);
|
---|
| 1485 | /* no error messages please... */
|
---|
| 1486 | close(STDERR_FILENO);
|
---|
| 1487 | xopen(bb_dev_null, O_WRONLY);
|
---|
| 1488 | BB_EXECVP("cat", (char**)cat_args);
|
---|
| 1489 | /* on failure we return to main, which does exit(EXIT_FAILURE) */
|
---|
| 1490 | #endif
|
---|
[821] | 1491 | }
|
---|
[2725] | 1492 | static void FAST_FUNC echo_dg(int s, servtab_t *sep)
|
---|
[821] | 1493 | {
|
---|
[2725] | 1494 | enum { BUFSIZE = 12*1024 }; /* for jumbo sized packets! :) */
|
---|
| 1495 | char *buf = xmalloc(BUFSIZE); /* too big for stack */
|
---|
| 1496 | int sz;
|
---|
| 1497 | len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
|
---|
[821] | 1498 |
|
---|
[2725] | 1499 | lsa->len = sep->se_lsa->len;
|
---|
| 1500 | /* dgram builtins are non-forking - DONT BLOCK! */
|
---|
| 1501 | sz = recvfrom(s, buf, BUFSIZE, MSG_DONTWAIT, &lsa->u.sa, &lsa->len);
|
---|
| 1502 | if (sz > 0)
|
---|
| 1503 | sendto(s, buf, sz, 0, &lsa->u.sa, lsa->len);
|
---|
| 1504 | free(buf);
|
---|
[821] | 1505 | }
|
---|
[1765] | 1506 | #endif /* FEATURE_INETD_SUPPORT_BUILTIN_ECHO */
|
---|
[821] | 1507 |
|
---|
[2725] | 1508 |
|
---|
[1765] | 1509 | #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
|
---|
[2725] | 1510 | /* Discard service -- ignore data. */
|
---|
[821] | 1511 | /* ARGSUSED */
|
---|
[2725] | 1512 | static void FAST_FUNC discard_stream(int s, servtab_t *sep UNUSED_PARAM)
|
---|
[821] | 1513 | {
|
---|
[2725] | 1514 | #if BB_MMU
|
---|
| 1515 | while (safe_read(s, line, LINE_SIZE) > 0)
|
---|
| 1516 | continue;
|
---|
| 1517 | #else
|
---|
| 1518 | /* We are after vfork here! */
|
---|
| 1519 | /* move network socket to stdin */
|
---|
| 1520 | xmove_fd(s, STDIN_FILENO);
|
---|
| 1521 | /* discard output */
|
---|
| 1522 | close(STDOUT_FILENO);
|
---|
| 1523 | xopen(bb_dev_null, O_WRONLY);
|
---|
| 1524 | /* no error messages please... */
|
---|
| 1525 | xdup2(STDOUT_FILENO, STDERR_FILENO);
|
---|
| 1526 | BB_EXECVP("cat", (char**)cat_args);
|
---|
| 1527 | /* on failure we return to main, which does exit(EXIT_FAILURE) */
|
---|
| 1528 | #endif
|
---|
[821] | 1529 | }
|
---|
| 1530 | /* ARGSUSED */
|
---|
[2725] | 1531 | static void FAST_FUNC discard_dg(int s, servtab_t *sep UNUSED_PARAM)
|
---|
[821] | 1532 | {
|
---|
[2725] | 1533 | /* dgram builtins are non-forking - DONT BLOCK! */
|
---|
| 1534 | recv(s, line, LINE_SIZE, MSG_DONTWAIT);
|
---|
[821] | 1535 | }
|
---|
[1765] | 1536 | #endif /* FEATURE_INETD_SUPPORT_BUILTIN_DISCARD */
|
---|
[821] | 1537 |
|
---|
| 1538 |
|
---|
[1765] | 1539 | #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
|
---|
[821] | 1540 | #define LINESIZ 72
|
---|
[2725] | 1541 | static void init_ring(void)
|
---|
[821] | 1542 | {
|
---|
[1765] | 1543 | int i;
|
---|
[821] | 1544 |
|
---|
[2725] | 1545 | end_ring = ring;
|
---|
| 1546 | for (i = ' '; i < 127; i++)
|
---|
| 1547 | *end_ring++ = i;
|
---|
[821] | 1548 | }
|
---|
[2725] | 1549 | /* Character generator. MMU arches only. */
|
---|
[821] | 1550 | /* ARGSUSED */
|
---|
[2725] | 1551 | static void FAST_FUNC chargen_stream(int s, servtab_t *sep UNUSED_PARAM)
|
---|
[821] | 1552 | {
|
---|
[1765] | 1553 | char *rs;
|
---|
| 1554 | int len;
|
---|
| 1555 | char text[LINESIZ + 2];
|
---|
[821] | 1556 |
|
---|
[2725] | 1557 | if (!end_ring) {
|
---|
| 1558 | init_ring();
|
---|
[1765] | 1559 | rs = ring;
|
---|
| 1560 | }
|
---|
| 1561 |
|
---|
| 1562 | text[LINESIZ] = '\r';
|
---|
| 1563 | text[LINESIZ + 1] = '\n';
|
---|
[821] | 1564 | rs = ring;
|
---|
[1765] | 1565 | for (;;) {
|
---|
[2725] | 1566 | len = end_ring - rs;
|
---|
[1765] | 1567 | if (len >= LINESIZ)
|
---|
| 1568 | memmove(text, rs, LINESIZ);
|
---|
| 1569 | else {
|
---|
| 1570 | memmove(text, rs, len);
|
---|
| 1571 | memmove(text + len, ring, LINESIZ - len);
|
---|
| 1572 | }
|
---|
[2725] | 1573 | if (++rs == end_ring)
|
---|
[1765] | 1574 | rs = ring;
|
---|
[2725] | 1575 | xwrite(s, text, sizeof(text));
|
---|
[821] | 1576 | }
|
---|
| 1577 | }
|
---|
| 1578 | /* ARGSUSED */
|
---|
[2725] | 1579 | static void FAST_FUNC chargen_dg(int s, servtab_t *sep)
|
---|
[821] | 1580 | {
|
---|
[1765] | 1581 | int len;
|
---|
| 1582 | char text[LINESIZ + 2];
|
---|
[2725] | 1583 | len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
|
---|
[821] | 1584 |
|
---|
[2725] | 1585 | /* Eat UDP packet which started it all */
|
---|
| 1586 | /* dgram builtins are non-forking - DONT BLOCK! */
|
---|
| 1587 | lsa->len = sep->se_lsa->len;
|
---|
| 1588 | if (recvfrom(s, text, sizeof(text), MSG_DONTWAIT, &lsa->u.sa, &lsa->len) < 0)
|
---|
| 1589 | return;
|
---|
| 1590 |
|
---|
| 1591 | if (!end_ring) {
|
---|
| 1592 | init_ring();
|
---|
| 1593 | ring_pos = ring;
|
---|
[1765] | 1594 | }
|
---|
[821] | 1595 |
|
---|
[2725] | 1596 | len = end_ring - ring_pos;
|
---|
| 1597 | if (len >= LINESIZ)
|
---|
| 1598 | memmove(text, ring_pos, LINESIZ);
|
---|
[1765] | 1599 | else {
|
---|
[2725] | 1600 | memmove(text, ring_pos, len);
|
---|
[1765] | 1601 | memmove(text + len, ring, LINESIZ - len);
|
---|
| 1602 | }
|
---|
[2725] | 1603 | if (++ring_pos == end_ring)
|
---|
| 1604 | ring_pos = ring;
|
---|
[1765] | 1605 | text[LINESIZ] = '\r';
|
---|
| 1606 | text[LINESIZ + 1] = '\n';
|
---|
[2725] | 1607 | sendto(s, text, sizeof(text), 0, &lsa->u.sa, lsa->len);
|
---|
[821] | 1608 | }
|
---|
[1765] | 1609 | #endif /* FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN */
|
---|
[821] | 1610 |
|
---|
| 1611 |
|
---|
[1765] | 1612 | #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME
|
---|
[821] | 1613 | /*
|
---|
| 1614 | * Return a machine readable date and time, in the form of the
|
---|
| 1615 | * number of seconds since midnight, Jan 1, 1900. Since gettimeofday
|
---|
| 1616 | * returns the number of seconds since midnight, Jan 1, 1970,
|
---|
| 1617 | * we must add 2208988800 seconds to this figure to make up for
|
---|
| 1618 | * some seventy years Bell Labs was asleep.
|
---|
| 1619 | */
|
---|
[2725] | 1620 | static uint32_t machtime(void)
|
---|
[821] | 1621 | {
|
---|
[1765] | 1622 | struct timeval tv;
|
---|
[821] | 1623 |
|
---|
[2725] | 1624 | gettimeofday(&tv, NULL);
|
---|
| 1625 | return htonl((uint32_t)(tv.tv_sec + 2208988800));
|
---|
[821] | 1626 | }
|
---|
| 1627 | /* ARGSUSED */
|
---|
[2725] | 1628 | static void FAST_FUNC machtime_stream(int s, servtab_t *sep UNUSED_PARAM)
|
---|
[821] | 1629 | {
|
---|
[2725] | 1630 | uint32_t result;
|
---|
[821] | 1631 |
|
---|
[1765] | 1632 | result = machtime();
|
---|
[2725] | 1633 | full_write(s, &result, sizeof(result));
|
---|
[821] | 1634 | }
|
---|
[2725] | 1635 | static void FAST_FUNC machtime_dg(int s, servtab_t *sep)
|
---|
[821] | 1636 | {
|
---|
[2725] | 1637 | uint32_t result;
|
---|
| 1638 | len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
|
---|
[821] | 1639 |
|
---|
[2725] | 1640 | lsa->len = sep->se_lsa->len;
|
---|
| 1641 | if (recvfrom(s, line, LINE_SIZE, MSG_DONTWAIT, &lsa->u.sa, &lsa->len) < 0)
|
---|
[1765] | 1642 | return;
|
---|
[2725] | 1643 |
|
---|
[1765] | 1644 | result = machtime();
|
---|
[2725] | 1645 | sendto(s, &result, sizeof(result), 0, &lsa->u.sa, lsa->len);
|
---|
[821] | 1646 | }
|
---|
[1765] | 1647 | #endif /* FEATURE_INETD_SUPPORT_BUILTIN_TIME */
|
---|
[821] | 1648 |
|
---|
| 1649 |
|
---|
[1765] | 1650 | #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
|
---|
[821] | 1651 | /* Return human-readable time of day */
|
---|
| 1652 | /* ARGSUSED */
|
---|
[2725] | 1653 | static void FAST_FUNC daytime_stream(int s, servtab_t *sep UNUSED_PARAM)
|
---|
[821] | 1654 | {
|
---|
[1765] | 1655 | time_t t;
|
---|
[821] | 1656 |
|
---|
[1765] | 1657 | t = time(NULL);
|
---|
[2725] | 1658 | fdprintf(s, "%.24s\r\n", ctime(&t));
|
---|
[821] | 1659 | }
|
---|
[2725] | 1660 | static void FAST_FUNC daytime_dg(int s, servtab_t *sep)
|
---|
[821] | 1661 | {
|
---|
[1765] | 1662 | time_t t;
|
---|
[2725] | 1663 | len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
|
---|
[821] | 1664 |
|
---|
[2725] | 1665 | lsa->len = sep->se_lsa->len;
|
---|
| 1666 | if (recvfrom(s, line, LINE_SIZE, MSG_DONTWAIT, &lsa->u.sa, &lsa->len) < 0)
|
---|
| 1667 | return;
|
---|
| 1668 |
|
---|
[1765] | 1669 | t = time(NULL);
|
---|
[2725] | 1670 | sprintf(line, "%.24s\r\n", ctime(&t));
|
---|
| 1671 | sendto(s, line, strlen(line), 0, &lsa->u.sa, lsa->len);
|
---|
[821] | 1672 | }
|
---|
[1765] | 1673 | #endif /* FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME */
|
---|