1 /* vi: set sw=4 ts=4: */
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> */
6 /* IPv6 support, many bug fixes by Denys Vlasenko (c) 2008 */
8 * Copyright (c) 1983,1991 The Regents of the University of California.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
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.
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS" AND
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
40 /* Inetd - Internet super-server
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
45 * connection is made, by creating a process. This process
46 * is passed the connection as file descriptor 0 and is
47 * expected to do a getpeername to find out peer's host
49 * Datagram oriented services are invoked when a datagram
50 * arrives; a process is created and passed a pending message
51 * on file descriptor 0. peer's address can be obtained
54 * Inetd uses a configuration file which is read at startup
55 * and, possibly, at some later time in response to a hangup signal.
56 * The configuration file is "free format" with fields given in the
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.
60 * service_name must be in /etc/services
61 * socket_type stream/dgram/raw/rdm/seqpacket
62 * protocol must be in /etc/protocols
63 * (usually "tcp" or "udp")
64 * wait/nowait[.max] single-threaded/multi-threaded, max #
65 * user[.group] or user[:group] user/group to run daemon as
66 * server_program full path name
67 * server_program_arguments maximum of MAXARGS (20)
70 * service_name/version must be in /etc/rpc
71 * socket_type stream/dgram/raw/rdm/seqpacket
72 * rpc/protocol "rpc/tcp" etc
73 * wait/nowait[.max] single-threaded/multi-threaded
74 * user[.group] or user[:group] user to run daemon as
75 * server_program full path name
76 * server_program_arguments maximum of MAXARGS (20)
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
81 * consists of a single '*' character, INADDR_ANY is used.
83 * A line can also consist of just
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
91 * is implicitly in effect at the beginning of the file.
93 * The hostaddress specifier may (and often will) contain dots;
94 * the service name must not.
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.
102 * Comment lines are indicated by a '#' in column 1.
105 /* inetd rules for passing file descriptors to children
106 * (http://www.freebsd.org/cgi/man.cgi?query=inetd):
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
121 * said to be "single-threaded". The comsat(8), biff(1) and talkd(8)
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.
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.
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.
142 /* Here's the scoop concerning the user[:group] feature:
143 * 1) group is not specified:
144 * a) user = root: NO setuid() or setgid() is done
145 * b) other: initgroups(name, primary group)
146 * setgid(primary group as found in passwd)
148 * 2) group is specified:
149 * a) user = root: setgid(specified group)
152 * b) other: initgroups(name, specified group)
153 * setgid(specified group)
162 #if ENABLE_FEATURE_INETD_RPC
164 #include <rpc/pmap_clnt.h>
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
174 #define _PATH_INETDPID "/var/run/inetd.pid"
176 #define CNT_INTERVAL 60 /* servers in CNT_INTERVAL sec. */
177 #define RETRYTIME 60 /* retry after bind or server fail */
179 // TODO: explain, or get rid of setrlimit games
181 #ifndef RLIMIT_NOFILE
182 #define RLIMIT_NOFILE RLIMIT_OFILE
189 /* Reserve some descriptors, 3 stdio + at least: 1 log, 1 conf. file */
192 #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
200 typedef struct servtab_t {
201 /* The most frequently referenced one: */
202 int se_fd; /* open descriptor */
203 /* NB: 'biggest fields last' saves on code size (~250 bytes) */
204 /* [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]" */
209 #if ENABLE_FEATURE_INETD_RPC
210 int se_rpcprog; /* rpc program number */
211 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)
215 #define is_rpc_service(sep) 0
217 pid_t se_wait; /* 0:"nowait", 1:"wait", >1:"wait" */
218 /* and waiting for this pid */
219 socktype_t se_socktype; /* SOCK_STREAM/DGRAM/RDM/... */
220 family_t se_family; /* AF_UNIX/INET[6] */
221 /* se_proto_no is used by RPC code only... hmm */
222 smallint se_proto_no; /* IPPROTO_TCP/UDP, n/a for AF_UNIX */
223 smallint se_checked; /* looked at during merge */
224 unsigned se_max; /* allowed instances per minute */
225 unsigned se_count; /* number started since se_time */
226 unsigned se_time; /* when we started counting */
227 char *se_user; /* user name to run as */
228 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 */
232 struct servtab_t *se_next;
233 len_and_sockaddr *se_lsa;
234 char *se_program; /* server program */
236 char *se_argv[MAXARGV + 1]; /* program arguments */
239 #ifdef INETD_BUILTINS_ENABLED
240 /* Echo received data */
241 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
242 static void FAST_FUNC echo_stream(int, servtab_t *);
243 static void FAST_FUNC echo_dg(int, servtab_t *);
245 /* Internet /dev/null */
246 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
247 static void FAST_FUNC discard_stream(int, servtab_t *);
248 static void FAST_FUNC discard_dg(int, servtab_t *);
250 /* Return 32 bit time since 1900 */
251 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME
252 static void FAST_FUNC machtime_stream(int, servtab_t *);
253 static void FAST_FUNC machtime_dg(int, servtab_t *);
255 /* Return human-readable time */
256 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
257 static void FAST_FUNC daytime_stream(int, servtab_t *);
258 static void FAST_FUNC daytime_dg(int, servtab_t *);
260 /* Familiar character generator */
261 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
262 static void FAST_FUNC chargen_stream(int, servtab_t *);
263 static void FAST_FUNC chargen_dg(int, servtab_t *);
267 /* 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 */
270 void (*bi_stream_fn)(int, servtab_t *) FAST_FUNC;
271 void (*bi_dgram_fn)(int, servtab_t *) FAST_FUNC;
274 static const struct builtin builtins[] = {
275 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
276 { "echo", 1, echo_stream, echo_dg },
278 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
279 { "discard", 1, discard_stream, discard_dg },
281 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
282 { "chargen", 1, chargen_stream, chargen_dg },
284 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME
285 { "time", 0, machtime_stream, machtime_dg },
287 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
288 { "daytime", 0, daytime_stream, daytime_dg },
291 #endif /* INETD_BUILTINS_ENABLED */
294 rlim_t rlim_ofile_cur;
295 struct rlimit rlim_ofile;
296 servtab_t *serv_list;
298 int maxsock; /* max fd# in allsock, -1: unknown */
299 /* whenever maxsock grows, prev_maxsock is set to new maxsock,
300 * but if maxsock is set to -1, prev_maxsock is not changed */
302 unsigned max_concurrency;
303 smallint alarm_armed;
304 uid_t real_uid; /* user ID who ran us */
305 const char *config_filename;
307 char *default_local_hostname;
308 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
314 /* Used in next_line(), and as scratch read buffer */
315 char line[256]; /* _at least_ 256, see LINE_SIZE */
317 #define G (*(struct globals*)&bb_common_bufsiz1)
318 enum { LINE_SIZE = COMMON_BUFSIZE - offsetof(struct globals, line) };
319 struct BUG_G_too_big {
320 char BUG_G_too_big[sizeof(G) <= COMMON_BUFSIZE ? 1 : -1];
322 #define rlim_ofile_cur (G.rlim_ofile_cur )
323 #define rlim_ofile (G.rlim_ofile )
324 #define serv_list (G.serv_list )
325 #define global_queuelen (G.global_queuelen)
326 #define maxsock (G.maxsock )
327 #define prev_maxsock (G.prev_maxsock )
328 #define max_concurrency (G.max_concurrency)
329 #define alarm_armed (G.alarm_armed )
330 #define real_uid (G.real_uid )
331 #define config_filename (G.config_filename)
332 #define parser (G.parser )
333 #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 )
336 #define end_ring (G.end_ring )
337 #define ring_pos (G.ring_pos )
338 #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"; \
347 static void maybe_close(int fd)
353 // TODO: move to libbb?
354 static len_and_sockaddr *xzalloc_lsa(int family)
356 len_and_sockaddr *lsa;
359 sz = sizeof(struct sockaddr_in);
360 if (family == AF_UNIX)
361 sz = sizeof(struct sockaddr_un);
362 #if ENABLE_FEATURE_IPV6
363 if (family == AF_INET6)
364 sz = sizeof(struct sockaddr_in6);
366 lsa = xzalloc(LSA_LEN_SIZE + sz);
368 lsa->u.sa.sa_family = family;
372 static void rearm_alarm(void)
380 static void block_CHLD_HUP_ALRM(sigset_t *m)
383 sigaddset(m, SIGCHLD);
384 sigaddset(m, SIGHUP);
385 sigaddset(m, SIGALRM);
386 sigprocmask(SIG_BLOCK, m, m); /* old sigmask is stored in m */
389 static void restore_sigmask(sigset_t *m)
391 sigprocmask(SIG_SETMASK, m, NULL);
394 #if ENABLE_FEATURE_INETD_RPC
395 static void register_rpc(servtab_t *sep)
398 struct sockaddr_in ir_sin;
401 size = sizeof(ir_sin);
402 if (getsockname(sep->se_fd, (struct sockaddr *) &ir_sin, &size) < 0) {
403 bb_perror_msg("getsockname");
407 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));
416 static void unregister_rpc(servtab_t *sep)
420 for (n = sep->se_rpcver_lo; n <= sep->se_rpcver_hi; n++) {
421 if (!pmap_unset(sep->se_rpcprog, n))
422 bb_perror_msg("pmap_unset(%u,%u)", sep->se_rpcprog, n);
425 #endif /* FEATURE_INETD_RPC */
427 static void bump_nofile(void)
429 enum { FD_CHUNK = 32 };
432 /* Never fails under Linux (except if you pass it bad arguments) */
433 getrlimit(RLIMIT_NOFILE, &rl);
434 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) {
437 bb_error_msg("can't extend file limit, max = %d",
442 if (setrlimit(RLIMIT_NOFILE, &rl) < 0) {
443 bb_perror_msg("setrlimit");
447 rlim_ofile_cur = rl.rlim_cur;
450 static void remove_fd_from_set(int fd)
453 FD_CLR(fd, &allsock);
458 static void add_fd_to_set(int fd)
461 FD_SET(fd, &allsock);
462 if (maxsock >= 0 && fd > maxsock) {
463 prev_maxsock = maxsock = fd;
464 if ((rlim_t)fd > rlim_ofile_cur - FD_MARGIN)
470 static void recalculate_maxsock(void)
474 /* We may have no services, in this case maxsock should still be >= 0
475 * (code elsewhere is not happy with maxsock == -1) */
477 while (fd <= prev_maxsock) {
478 if (FD_ISSET(fd, &allsock))
482 prev_maxsock = maxsock;
483 if ((rlim_t)maxsock > rlim_ofile_cur - FD_MARGIN)
487 static void prepare_socket_fd(servtab_t *sep)
491 fd = socket(sep->se_family, sep->se_socktype, 0);
493 bb_perror_msg("socket");
496 setsockopt_reuseaddr(fd);
498 #if ENABLE_FEATURE_INETD_RPC
499 if (is_rpc_service(sep)) {
502 /* zero out the port for all RPC services; let bind()
504 set_nport(sep->se_lsa, 0);
506 /* for RPC services, attempt to use a reserved port
507 * if they are going to be running as root. */
508 if (real_uid == 0 && sep->se_family == AF_INET
509 && (pwd = getpwnam(sep->se_user)) != NULL
512 r = bindresvport(fd, &sep->se_lsa->u.sin);
514 r = bind(fd, &sep->se_lsa->u.sa, sep->se_lsa->len);
517 int saveerrno = errno;
518 /* update lsa with port# */
519 getsockname(fd, &sep->se_lsa->u.sa, &sep->se_lsa->len);
525 if (sep->se_family == AF_UNIX) {
526 struct sockaddr_un *sun;
527 sun = (struct sockaddr_un*)&(sep->se_lsa->u.sa);
528 unlink(sun->sun_path);
530 r = bind(fd, &sep->se_lsa->u.sa, sep->se_lsa->len);
533 bb_perror_msg("%s/%s: bind",
534 sep->se_service, sep->se_proto);
539 if (sep->se_socktype == SOCK_STREAM)
540 listen(fd, global_queuelen);
546 static int reopen_config_file(void)
548 free(default_local_hostname);
549 default_local_hostname = xstrdup("*");
551 config_close(parser);
552 parser = config_open(config_filename);
553 return (parser != NULL);
556 static void close_config_file(void)
559 config_close(parser);
564 static void free_servtab_strings(servtab_t *cp)
568 free(cp->se_local_hostname);
569 free(cp->se_service);
573 free(cp->se_lsa); /* not a string in fact */
574 free(cp->se_program);
575 for (i = 0; i < MAXARGV; i++)
576 free(cp->se_argv[i]);
579 static servtab_t *new_servtab(void)
581 servtab_t *newtab = xzalloc(sizeof(servtab_t));
582 newtab->se_fd = -1; /* paranoia */
586 static servtab_t *dup_servtab(servtab_t *sep)
591 newtab = new_servtab();
592 *newtab = *sep; /* struct copy */
593 /* deep-copying strings */
594 newtab->se_service = xstrdup(newtab->se_service);
595 newtab->se_proto = xstrdup(newtab->se_proto);
596 newtab->se_user = xstrdup(newtab->se_user);
597 newtab->se_group = xstrdup(newtab->se_group);
598 newtab->se_program = xstrdup(newtab->se_program);
599 for (argc = 0; argc <= MAXARGV; argc++)
600 newtab->se_argv[argc] = xstrdup(newtab->se_argv[argc]);
601 /* NB: se_fd, se_hostaddr and se_next are always
602 * overwrittend by callers, so we don't bother resetting them
603 * to NULL/0/-1 etc */
608 /* gcc generates much more code if this is inlined */
609 static servtab_t *parse_one_line(void)
612 char *token[6+MAXARGV];
620 argc = config_read(parser, token, 6+MAXARGV, 1, "# \t", PARSE_NORMAL);
626 /* [host:]service socktype proto wait user[:group] prog [args] */
627 /* Check for "host:...." line */
629 hostdelim = strrchr(arg, ':');
632 sep->se_local_hostname = xstrdup(arg);
634 if (*arg == '\0' && argc == 1) {
635 /* Line has just "host:", change the
636 * default host for the following lines. */
637 free(default_local_hostname);
638 default_local_hostname = sep->se_local_hostname;
642 sep->se_local_hostname = xstrdup(default_local_hostname);
644 /* service socktype proto wait user[:group] prog [args] */
645 sep->se_service = xstrdup(arg);
647 /* socktype proto wait user[:group] prog [args] */
650 bb_error_msg("parse error on line %u, line is ignored",
652 free_servtab_strings(sep);
653 /* Just "goto more" can make sep to carry over e.g.
654 * "rpc"-ness (by having se_rpcver_lo != 0).
655 * We will be more paranoid: */
661 static const int8_t SOCK_xxx[] ALIGN1 = {
663 SOCK_STREAM, SOCK_DGRAM, SOCK_RDM,
664 SOCK_SEQPACKET, SOCK_RAW
666 sep->se_socktype = SOCK_xxx[1 + index_in_strings(
667 "stream""\0" "dgram""\0" "rdm""\0"
668 "seqpacket""\0" "raw""\0"
672 /* {unix,[rpc/]{tcp,udp}[6]} wait user[:group] prog [args] */
673 sep->se_proto = arg = xstrdup(token[2]);
674 if (strcmp(arg, "unix") == 0) {
675 sep->se_family = AF_UNIX;
678 sep->se_family = AF_INET;
679 six = last_char_is(arg, '6');
681 #if ENABLE_FEATURE_IPV6
683 sep->se_family = AF_INET6;
685 bb_error_msg("%s: no support for IPv6", sep->se_proto);
689 if (strncmp(arg, "rpc/", 4) == 0) {
690 #if ENABLE_FEATURE_INETD_RPC
693 p = strchr(sep->se_service, '/');
695 bb_error_msg("no rpc version: '%s'", sep->se_service);
699 n = bb_strtou(p, &p, 10);
702 bb_error_msg("bad rpc version");
705 sep->se_rpcver_lo = sep->se_rpcver_hi = n;
708 n = bb_strtou(p, &p, 10);
709 if (n > INT_MAX || (int)n < sep->se_rpcver_lo)
711 sep->se_rpcver_hi = n;
716 bb_error_msg("no support for rpc services");
720 /* we don't really need getprotobyname()! */
721 if (strcmp(arg, "tcp") == 0)
722 sep->se_proto_no = IPPROTO_TCP; /* = 6 */
723 if (strcmp(arg, "udp") == 0)
724 sep->se_proto_no = IPPROTO_UDP; /* = 17 */
727 if (!sep->se_proto_no) /* not tcp/udp?? */
731 /* [no]wait[.max] user[:group] prog [args] */
733 sep->se_max = max_concurrency;
734 p = strchr(arg, '.');
737 sep->se_max = bb_strtou(p, NULL, 10);
741 sep->se_wait = (arg[0] != 'n' || arg[1] != 'o');
742 if (!sep->se_wait) /* "no" seen */
744 if (strcmp(arg, "wait") != 0)
747 /* user[:group] prog [args] */
748 sep->se_user = xstrdup(token[4]);
749 arg = strchr(sep->se_user, '.');
751 arg = strchr(sep->se_user, ':');
754 sep->se_group = xstrdup(arg);
758 sep->se_program = xstrdup(token[5]);
759 #ifdef INETD_BUILTINS_ENABLED
760 if (strcmp(sep->se_program, "internal") == 0
761 && strlen(sep->se_service) <= 7
762 && (sep->se_socktype == SOCK_STREAM
763 || sep->se_socktype == SOCK_DGRAM)
766 for (i = 0; i < ARRAY_SIZE(builtins); i++)
767 if (strncmp(builtins[i].bi_service7, sep->se_service, 7) == 0)
769 bb_error_msg("unknown internal service %s", sep->se_service);
772 sep->se_builtin = &builtins[i];
773 /* stream builtins must be "nowait", dgram must be "wait" */
774 if (sep->se_wait != (sep->se_socktype == SOCK_DGRAM))
779 while ((arg = token[6+argc]) != NULL && argc < MAXARGV)
780 sep->se_argv[argc++] = xstrdup(arg);
781 /* Some inetd.conf files have no argv's, not even argv[0].
783 * (Technically, programs can be execed with argv[0] = NULL,
784 * but many programs do not like that at all) */
786 sep->se_argv[0] = xstrdup(sep->se_program);
788 /* catch mixups. "<service> stream udp ..." == wtf */
789 if (sep->se_socktype == SOCK_STREAM) {
790 if (sep->se_proto_no == IPPROTO_UDP)
793 if (sep->se_socktype == SOCK_DGRAM) {
794 if (sep->se_proto_no == IPPROTO_TCP)
799 // "ENTRY[%s][%s][%s][%d][%d][%d][%d][%d][%s][%s][%s]",
800 // sep->se_local_hostname, sep->se_service, sep->se_proto, sep->se_wait, sep->se_proto_no,
801 // sep->se_max, sep->se_count, sep->se_time, sep->se_user, sep->se_group, sep->se_program);
803 /* check if the hostname specifier is a comma separated list
804 * of hostnames. we'll make new entries for each address. */
805 while ((hostdelim = strrchr(sep->se_local_hostname, ',')) != NULL) {
806 nsep = dup_servtab(sep);
807 /* NUL terminate the hostname field of the existing entry,
808 * and make a dup for the new entry. */
810 nsep->se_local_hostname = xstrdup(hostdelim);
811 nsep->se_next = sep->se_next;
815 /* was doing it here: */
816 /* DNS resolution, create copies for each IP address */
817 /* IPv6-ization destroyed it :( */
822 static servtab_t *insert_in_servlist(servtab_t *cp)
828 *sep = *cp; /* struct copy */
830 #if ENABLE_FEATURE_INETD_RPC
831 sep->se_rpcprog = -1;
833 block_CHLD_HUP_ALRM(&omask);
834 sep->se_next = serv_list;
836 restore_sigmask(&omask);
840 static int same_serv_addr_proto(servtab_t *old, servtab_t *new)
842 if (strcmp(old->se_local_hostname, new->se_local_hostname) != 0)
844 if (strcmp(old->se_service, new->se_service) != 0)
846 if (strcmp(old->se_proto, new->se_proto) != 0)
851 static void reread_config_file(int sig UNUSED_PARAM)
853 servtab_t *sep, *cp, **sepp;
854 len_and_sockaddr *lsa;
858 int save_errno = errno;
860 if (!reopen_config_file())
862 for (sep = serv_list; sep; sep = sep->se_next)
869 cp = parse_one_line();
873 for (sep = serv_list; sep; sep = sep->se_next)
874 if (same_serv_addr_proto(sep, cp))
876 /* not an "equal" servtab */
877 sep = insert_in_servlist(cp);
883 block_CHLD_HUP_ALRM(&omask);
884 #if ENABLE_FEATURE_INETD_RPC
885 if (is_rpc_service(sep))
887 sep->se_rpcver_lo = cp->se_rpcver_lo;
888 sep->se_rpcver_hi = cp->se_rpcver_hi;
890 if (cp->se_wait == 0) {
891 /* New config says "nowait". If old one
892 * was "wait", we currently may be waiting
893 * for a child (and not accepting connects).
894 * Stop waiting, start listening again.
895 * (if it's not true, this op is harmless) */
896 add_fd_to_set(sep->se_fd);
898 sep->se_wait = cp->se_wait;
899 sep->se_max = cp->se_max;
900 /* string fields need more love - we don't want to leak them */
901 #define SWAP(type, a, b) do { type c = (type)a; a = (type)b; b = (type)c; } while (0)
902 SWAP(char*, sep->se_user, cp->se_user);
903 SWAP(char*, sep->se_group, cp->se_group);
904 SWAP(char*, sep->se_program, cp->se_program);
905 for (i = 0; i < MAXARGV; i++)
906 SWAP(char*, sep->se_argv[i], cp->se_argv[i]);
908 restore_sigmask(&omask);
909 free_servtab_strings(cp);
912 /* cp->string_fields are consumed by insert_in_servlist()
913 * or freed at this point, cp itself is not yet freed. */
916 /* create new len_and_sockaddr */
917 switch (sep->se_family) {
918 struct sockaddr_un *sun;
920 lsa = xzalloc_lsa(AF_UNIX);
921 sun = (struct sockaddr_un*)&lsa->u.sa;
922 safe_strncpy(sun->sun_path, sep->se_service, sizeof(sun->sun_path));
925 default: /* case AF_INET, case AF_INET6 */
926 n = bb_strtou(sep->se_service, NULL, 10);
927 #if ENABLE_FEATURE_INETD_RPC
928 if (is_rpc_service(sep)) {
930 if (errno) { /* se_service is not numeric */
931 struct rpcent *rp = getrpcbyname(sep->se_service);
933 bb_error_msg("%s: unknown rpc service", sep->se_service);
936 sep->se_rpcprog = rp->r_number;
938 if (sep->se_fd == -1)
939 prepare_socket_fd(sep);
940 if (sep->se_fd != -1)
945 /* what port to listen on? */
947 if (errno || n > 0xffff) { /* se_service is not numeric */
950 /* can result only in "tcp" or "udp": */
951 safe_strncpy(protoname, sep->se_proto, 4);
952 sp = getservbyname(sep->se_service, protoname);
954 bb_error_msg("%s/%s: unknown service",
955 sep->se_service, sep->se_proto);
960 if (LONE_CHAR(sep->se_local_hostname, '*')) {
961 lsa = xzalloc_lsa(sep->se_family);
962 set_nport(lsa, port);
964 lsa = host_and_af2sockaddr(sep->se_local_hostname,
965 ntohs(port), sep->se_family);
967 bb_error_msg("%s/%s: unknown host '%s'",
968 sep->se_service, sep->se_proto,
969 sep->se_local_hostname);
974 } /* end of "switch (sep->se_family)" */
976 /* did lsa change? Then close/open */
977 if (sep->se_lsa == NULL
978 || lsa->len != sep->se_lsa->len
979 || memcmp(&lsa->u.sa, &sep->se_lsa->u.sa, lsa->len) != 0
981 remove_fd_from_set(sep->se_fd);
982 maybe_close(sep->se_fd);
989 if (sep->se_fd == -1)
990 prepare_socket_fd(sep);
995 } /* end of "while (1) parse lines" */
998 /* Purge anything not looked at above - these are stale entries,
999 * new config file doesnt have them. */
1000 block_CHLD_HUP_ALRM(&omask);
1002 while ((sep = *sepp)) {
1003 if (sep->se_checked) {
1004 sepp = &sep->se_next;
1007 *sepp = sep->se_next;
1008 remove_fd_from_set(sep->se_fd);
1009 maybe_close(sep->se_fd);
1010 #if ENABLE_FEATURE_INETD_RPC
1011 if (is_rpc_service(sep))
1012 unregister_rpc(sep);
1014 if (sep->se_family == AF_UNIX)
1015 unlink(sep->se_service);
1016 free_servtab_strings(sep);
1019 restore_sigmask(&omask);
1024 static void reap_child(int sig UNUSED_PARAM)
1029 int save_errno = errno;
1032 pid = wait_any_nohang(&status);
1035 for (sep = serv_list; sep; sep = sep->se_next) {
1036 if (sep->se_wait != pid)
1038 /* One of our "wait" services */
1039 if (WIFEXITED(status) && WEXITSTATUS(status))
1040 bb_error_msg("%s: exit status %u",
1041 sep->se_program, WEXITSTATUS(status));
1042 else if (WIFSIGNALED(status))
1043 bb_error_msg("%s: exit signal %u",
1044 sep->se_program, WTERMSIG(status));
1046 add_fd_to_set(sep->se_fd);
1053 static void retry_network_setup(int sig UNUSED_PARAM)
1055 int save_errno = errno;
1059 for (sep = serv_list; sep; sep = sep->se_next) {
1060 if (sep->se_fd == -1) {
1061 prepare_socket_fd(sep);
1062 #if ENABLE_FEATURE_INETD_RPC
1063 if (sep->se_fd != -1 && is_rpc_service(sep))
1071 static void clean_up_and_exit(int sig UNUSED_PARAM)
1075 /* XXX signal race walking sep list */
1076 for (sep = serv_list; sep; sep = sep->se_next) {
1077 if (sep->se_fd == -1)
1080 switch (sep->se_family) {
1082 unlink(sep->se_service);
1084 default: /* case AF_INET, AF_INET6 */
1085 #if ENABLE_FEATURE_INETD_RPC
1086 if (sep->se_wait == 1 && is_rpc_service(sep))
1087 unregister_rpc(sep); /* XXX signal race */
1091 if (ENABLE_FEATURE_CLEAN_UP)
1094 remove_pidfile(_PATH_INETDPID);
1098 int inetd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1099 int inetd_main(int argc UNUSED_PARAM, char **argv)
1101 struct sigaction sa, saved_pipe_handler;
1102 servtab_t *sep, *sep2;
1104 struct group *grp = grp; /* for compiler */
1111 real_uid = getuid();
1112 if (real_uid != 0) /* run by non-root user */
1113 config_filename = NULL;
1115 opt_complementary = "R+:q+"; /* -q N, -R N */
1116 opt = getopt32(argv, "R:feq:", &max_concurrency, &global_queuelen);
1120 config_filename = argv[0];
1121 if (config_filename == NULL)
1122 bb_error_msg_and_die("non-root must specify config file");
1124 bb_daemonize_or_rexec(0, argv - optind);
1126 bb_sanitize_stdio();
1128 /* LOG_NDELAY: connect to syslog daemon NOW.
1129 * Otherwise, we may open syslog socket
1130 * in vforked child, making opened fds and syslog()
1131 * internal state inconsistent.
1132 * This was observed to leak file descriptors. */
1133 openlog(applet_name, LOG_PID | LOG_NDELAY, LOG_DAEMON);
1134 logmode = LOGMODE_SYSLOG;
1137 if (real_uid == 0) {
1138 /* run by root, ensure groups vector gets trashed */
1139 gid_t gid = getgid();
1143 write_pidfile(_PATH_INETDPID);
1145 /* never fails under Linux (except if you pass it bad arguments) */
1146 getrlimit(RLIMIT_NOFILE, &rlim_ofile);
1147 rlim_ofile_cur = rlim_ofile.rlim_cur;
1148 if (rlim_ofile_cur == RLIM_INFINITY) /* ! */
1149 rlim_ofile_cur = OPEN_MAX;
1151 memset(&sa, 0, sizeof(sa));
1152 /*sigemptyset(&sa.sa_mask); - memset did it */
1153 sigaddset(&sa.sa_mask, SIGALRM);
1154 sigaddset(&sa.sa_mask, SIGCHLD);
1155 sigaddset(&sa.sa_mask, SIGHUP);
1156 sa.sa_handler = retry_network_setup;
1157 sigaction_set(SIGALRM, &sa);
1158 sa.sa_handler = reread_config_file;
1159 sigaction_set(SIGHUP, &sa);
1160 sa.sa_handler = reap_child;
1161 sigaction_set(SIGCHLD, &sa);
1162 sa.sa_handler = clean_up_and_exit;
1163 sigaction_set(SIGTERM, &sa);
1164 sa.sa_handler = clean_up_and_exit;
1165 sigaction_set(SIGINT, &sa);
1166 sa.sa_handler = SIG_IGN;
1167 sigaction(SIGPIPE, &sa, &saved_pipe_handler);
1169 reread_config_file(SIGHUP); /* load config from file */
1173 int ctrl, accepted_fd, new_udp_fd;
1177 recalculate_maxsock();
1179 readable = allsock; /* struct copy */
1180 /* if there are no fds to wait on, we will block
1181 * until signal wakes us up (maxsock == 0, but readable
1182 * never contains fds 0 and 1...) */
1183 ready_fd_cnt = select(maxsock + 1, &readable, NULL, NULL, NULL);
1184 if (ready_fd_cnt < 0) {
1185 if (errno != EINTR) {
1186 bb_perror_msg("select");
1192 for (sep = serv_list; ready_fd_cnt && sep; sep = sep->se_next) {
1193 if (sep->se_fd == -1 || !FD_ISSET(sep->se_fd, &readable))
1200 if (!sep->se_wait) {
1201 if (sep->se_socktype == SOCK_STREAM) {
1202 ctrl = accepted_fd = accept(sep->se_fd, NULL, NULL);
1205 bb_perror_msg("accept (for %s)", sep->se_service);
1210 if (sep->se_socktype == SOCK_DGRAM
1211 && sep->se_family != AF_UNIX
1213 /* How udp "nowait" works:
1214 * child peeks at (received and buffered by kernel) UDP packet,
1215 * performs connect() on the socket so that it is linked only
1216 * to this peer. But this also affects parent, because descriptors
1217 * are shared after fork() a-la dup(). When parent performs
1218 * select(), it will see this descriptor connected to the peer (!)
1219 * and still readable, will act on it and mess things up
1220 * (can create many copies of same child, etc).
1221 * Parent must create and use new socket instead. */
1222 new_udp_fd = socket(sep->se_family, SOCK_DGRAM, 0);
1223 if (new_udp_fd < 0) { /* error: eat packet, forget about it */
1225 recv(sep->se_fd, line, LINE_SIZE, MSG_DONTWAIT);
1228 setsockopt_reuseaddr(new_udp_fd);
1229 /* TODO: better do bind after vfork in parent,
1230 * so that we don't have two wildcard bound sockets
1231 * even for a brief moment? */
1232 if (bind(new_udp_fd, &sep->se_lsa->u.sa, sep->se_lsa->len) < 0) {
1239 block_CHLD_HUP_ALRM(&omask);
1241 #ifdef INETD_BUILTINS_ENABLED
1242 /* do we need to fork? */
1243 if (sep->se_builtin == NULL
1244 || (sep->se_socktype == SOCK_STREAM
1245 && sep->se_builtin->bi_fork))
1248 if (sep->se_max != 0) {
1249 if (++sep->se_count == 1)
1250 sep->se_time = monotonic_sec();
1251 else if (sep->se_count >= sep->se_max) {
1252 unsigned now = monotonic_sec();
1253 /* did we accumulate se_max connects too quickly? */
1254 if (now - sep->se_time <= CNT_INTERVAL) {
1255 bb_error_msg("%s/%s: too many connections, pausing",
1256 sep->se_service, sep->se_proto);
1257 remove_fd_from_set(sep->se_fd);
1261 rearm_alarm(); /* will revive it in RETRYTIME sec */
1262 restore_sigmask(&omask);
1263 maybe_close(accepted_fd);
1264 continue; /* -> check next fd in fd set */
1269 /* on NOMMU, streamed chargen
1270 * builtin wouldn't work, but it is
1271 * not allowed on NOMMU (ifdefed out) */
1272 #ifdef INETD_BUILTINS_ENABLED
1273 if (BB_MMU && sep->se_builtin)
1279 if (pid < 0) { /* fork error */
1280 bb_perror_msg("vfork"+1);
1282 restore_sigmask(&omask);
1283 maybe_close(accepted_fd);
1284 continue; /* -> check next fd in fd set */
1287 pid--; /* -1: "we did fork and we are child" */
1289 /* if pid == 0 here, we never forked */
1291 if (pid > 0) { /* parent */
1293 /* tcp wait: we passed listening socket to child,
1294 * will wait for child to terminate */
1296 remove_fd_from_set(sep->se_fd);
1298 if (new_udp_fd >= 0) {
1299 /* udp nowait: child connected the socket,
1300 * we created and will use new, unconnected one */
1301 xmove_fd(new_udp_fd, sep->se_fd);
1303 restore_sigmask(&omask);
1304 maybe_close(accepted_fd);
1305 continue; /* -> check next fd in fd set */
1308 /* we are either child or didn't vfork at all */
1309 #ifdef INETD_BUILTINS_ENABLED
1310 if (sep->se_builtin) {
1311 if (pid) { /* "pid" is -1: we did vfork */
1312 close(sep->se_fd); /* listening socket */
1313 logmode = LOGMODE_NONE; /* make xwrite etc silent */
1315 restore_sigmask(&omask);
1316 if (sep->se_socktype == SOCK_STREAM)
1317 sep->se_builtin->bi_stream_fn(ctrl, sep);
1319 sep->se_builtin->bi_dgram_fn(ctrl, sep);
1320 if (pid) /* we did vfork */
1321 _exit(EXIT_FAILURE);
1322 maybe_close(accepted_fd);
1323 continue; /* -> check next fd in fd set */
1329 if (new_udp_fd >= 0) {
1330 len_and_sockaddr *lsa = xzalloc_lsa(sep->se_family);
1331 /* peek at the packet and remember peer addr */
1332 int r = recvfrom(ctrl, NULL, 0, MSG_PEEK|MSG_DONTWAIT,
1333 &lsa->u.sa, &lsa->len);
1336 /* make this socket "connected" to peer addr:
1337 * only packets from this peer will be recv'ed,
1338 * and bare write()/send() will work on it */
1339 connect(ctrl, &lsa->u.sa, lsa->len);
1342 /* prepare env and exec program */
1343 pwd = getpwnam(sep->se_user);
1345 bb_error_msg("%s: no such %s", sep->se_user, "user");
1348 if (sep->se_group && (grp = getgrnam(sep->se_group)) == NULL) {
1349 bb_error_msg("%s: no such %s", sep->se_group, "group");
1352 if (real_uid != 0 && real_uid != pwd->pw_uid) {
1353 /* a user running private inetd */
1354 bb_error_msg("non-root must run services as himself");
1359 pwd->pw_gid = grp->gr_gid;
1360 /* initgroups, setgid, setuid: */
1361 change_identity(pwd);
1362 } else if (sep->se_group) {
1363 xsetgid(grp->gr_gid);
1364 setgroups(1, &grp->gr_gid);
1366 if (rlim_ofile.rlim_cur != rlim_ofile_cur)
1367 if (setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0)
1368 bb_perror_msg("setrlimit");
1370 /* closelog(); - WRONG. we are after vfork,
1371 * this may confuse syslog() internal state.
1372 * Let's hope libc sets syslog fd to CLOEXEC...
1374 xmove_fd(ctrl, STDIN_FILENO);
1375 xdup2(STDIN_FILENO, STDOUT_FILENO);
1376 /* manpages of inetd I managed to find either say
1377 * that stderr is also redirected to the network,
1378 * or do not talk about redirection at all (!) */
1379 if (!sep->se_wait) /* only for usual "tcp nowait" */
1380 xdup2(STDIN_FILENO, STDERR_FILENO);
1381 /* NB: among others, this loop closes listening sockets
1382 * for nowait stream children */
1383 for (sep2 = serv_list; sep2; sep2 = sep2->se_next)
1384 if (sep2->se_fd != ctrl)
1385 maybe_close(sep2->se_fd);
1386 sigaction_set(SIGPIPE, &saved_pipe_handler);
1387 restore_sigmask(&omask);
1388 BB_EXECVP(sep->se_program, sep->se_argv);
1389 bb_perror_msg("can't execute '%s'", sep->se_program);
1391 /* eat packet in udp case */
1392 if (sep->se_socktype != SOCK_STREAM)
1393 recv(0, line, LINE_SIZE, MSG_DONTWAIT);
1394 _exit(EXIT_FAILURE);
1395 } /* for (sep = servtab...) */
1400 static const char *const cat_args[] = { "cat", NULL };
1404 * Internet services provided internally by inetd:
1406 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
1407 /* Echo service -- echo data back. */
1409 static void FAST_FUNC echo_stream(int s, servtab_t *sep UNUSED_PARAM)
1413 ssize_t sz = safe_read(s, line, LINE_SIZE);
1416 xwrite(s, line, sz);
1419 /* We are after vfork here! */
1420 /* move network socket to stdin/stdout */
1421 xmove_fd(s, STDIN_FILENO);
1422 xdup2(STDIN_FILENO, STDOUT_FILENO);
1423 /* no error messages please... */
1424 close(STDERR_FILENO);
1425 xopen(bb_dev_null, O_WRONLY);
1426 BB_EXECVP("cat", (char**)cat_args);
1427 /* on failure we return to main, which does exit(EXIT_FAILURE) */
1430 static void FAST_FUNC echo_dg(int s, servtab_t *sep)
1432 enum { BUFSIZE = 12*1024 }; /* for jumbo sized packets! :) */
1433 char *buf = xmalloc(BUFSIZE); /* too big for stack */
1435 len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
1437 lsa->len = sep->se_lsa->len;
1438 /* dgram builtins are non-forking - DONT BLOCK! */
1439 sz = recvfrom(s, buf, BUFSIZE, MSG_DONTWAIT, &lsa->u.sa, &lsa->len);
1441 sendto(s, buf, sz, 0, &lsa->u.sa, lsa->len);
1444 #endif /* FEATURE_INETD_SUPPORT_BUILTIN_ECHO */
1447 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
1448 /* Discard service -- ignore data. */
1450 static void FAST_FUNC discard_stream(int s, servtab_t *sep UNUSED_PARAM)
1453 while (safe_read(s, line, LINE_SIZE) > 0)
1456 /* We are after vfork here! */
1457 /* move network socket to stdin */
1458 xmove_fd(s, STDIN_FILENO);
1459 /* discard output */
1460 close(STDOUT_FILENO);
1461 xopen(bb_dev_null, O_WRONLY);
1462 /* no error messages please... */
1463 xdup2(STDOUT_FILENO, STDERR_FILENO);
1464 BB_EXECVP("cat", (char**)cat_args);
1465 /* on failure we return to main, which does exit(EXIT_FAILURE) */
1469 static void FAST_FUNC discard_dg(int s, servtab_t *sep UNUSED_PARAM)
1471 /* dgram builtins are non-forking - DONT BLOCK! */
1472 recv(s, line, LINE_SIZE, MSG_DONTWAIT);
1474 #endif /* FEATURE_INETD_SUPPORT_BUILTIN_DISCARD */
1477 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
1479 static void init_ring(void)
1484 for (i = ' '; i < 127; i++)
1487 /* Character generator. MMU arches only. */
1489 static void FAST_FUNC chargen_stream(int s, servtab_t *sep UNUSED_PARAM)
1493 char text[LINESIZ + 2];
1500 text[LINESIZ] = '\r';
1501 text[LINESIZ + 1] = '\n';
1504 len = end_ring - rs;
1506 memmove(text, rs, LINESIZ);
1508 memmove(text, rs, len);
1509 memmove(text + len, ring, LINESIZ - len);
1511 if (++rs == end_ring)
1513 xwrite(s, text, sizeof(text));
1517 static void FAST_FUNC chargen_dg(int s, servtab_t *sep)
1520 char text[LINESIZ + 2];
1521 len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
1523 /* Eat UDP packet which started it all */
1524 /* dgram builtins are non-forking - DONT BLOCK! */
1525 lsa->len = sep->se_lsa->len;
1526 if (recvfrom(s, text, sizeof(text), MSG_DONTWAIT, &lsa->u.sa, &lsa->len) < 0)
1534 len = end_ring - ring_pos;
1536 memmove(text, ring_pos, LINESIZ);
1538 memmove(text, ring_pos, len);
1539 memmove(text + len, ring, LINESIZ - len);
1541 if (++ring_pos == end_ring)
1543 text[LINESIZ] = '\r';
1544 text[LINESIZ + 1] = '\n';
1545 sendto(s, text, sizeof(text), 0, &lsa->u.sa, lsa->len);
1547 #endif /* FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN */
1550 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME
1552 * Return a machine readable date and time, in the form of the
1553 * number of seconds since midnight, Jan 1, 1900. Since gettimeofday
1554 * returns the number of seconds since midnight, Jan 1, 1970,
1555 * we must add 2208988800 seconds to this figure to make up for
1556 * some seventy years Bell Labs was asleep.
1558 static uint32_t machtime(void)
1562 gettimeofday(&tv, NULL);
1563 return htonl((uint32_t)(tv.tv_sec + 2208988800));
1566 static void FAST_FUNC machtime_stream(int s, servtab_t *sep UNUSED_PARAM)
1570 result = machtime();
1571 full_write(s, &result, sizeof(result));
1573 static void FAST_FUNC machtime_dg(int s, servtab_t *sep)
1576 len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
1578 lsa->len = sep->se_lsa->len;
1579 if (recvfrom(s, line, LINE_SIZE, MSG_DONTWAIT, &lsa->u.sa, &lsa->len) < 0)
1582 result = machtime();
1583 sendto(s, &result, sizeof(result), 0, &lsa->u.sa, lsa->len);
1585 #endif /* FEATURE_INETD_SUPPORT_BUILTIN_TIME */
1588 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
1589 /* Return human-readable time of day */
1591 static void FAST_FUNC daytime_stream(int s, servtab_t *sep UNUSED_PARAM)
1596 fdprintf(s, "%.24s\r\n", ctime(&t));
1598 static void FAST_FUNC daytime_dg(int s, servtab_t *sep)
1601 len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
1603 lsa->len = sep->se_lsa->len;
1604 if (recvfrom(s, line, LINE_SIZE, MSG_DONTWAIT, &lsa->u.sa, &lsa->len) < 0)
1608 sprintf(line, "%.24s\r\n", ctime(&t));
1609 sendto(s, line, strlen(line), 0, &lsa->u.sa, lsa->len);
1611 #endif /* FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME */