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> */
7 * Copyright (c) 1983,1991 The Regents of the University of California.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 * Inetd - Internet super-server
42 * This program invokes all internet services as needed.
43 * connection-oriented services are invoked each time a
44 * connection is made, by creating a process. This process
45 * is passed the connection as file descriptor 0 and is
46 * expected to do a getpeername to find out the source 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. Datagram servers may either connect
52 * to their peer, freeing up the original socket for inetd
53 * to receive further messages on, or ``take over the socket'',
54 * processing all arriving datagrams and, eventually, timing
55 * out. The first type of server is said to be ``multi-threaded'';
56 * the second type of server ``single-threaded''.
58 * Inetd uses a configuration file which is read at startup
59 * and, possibly, at some later time in response to a hangup signal.
60 * The configuration file is ``free format'' with fields given in the
61 * order shown below. Continuation lines for an entry must begin with
62 * a space or tab. All fields must be present in each entry.
64 * service name must be in /etc/services
65 * socket type stream/dgram/raw/rdm/seqpacket
66 * protocol must be in /etc/protocols
67 * wait/nowait[.max] single-threaded/multi-threaded, max #
68 * user[.group] or user[:group] user/group to run daemon as
69 * server program full path name
70 * server program arguments maximum of MAXARGS (20)
73 * service name/version must be in /etc/rpc
74 * socket type stream/dgram/raw/rdm/seqpacket
75 * protocol must be in /etc/protocols
76 * wait/nowait[.max] single-threaded/multi-threaded
77 * user[.group] or user[:group] user to run daemon as
78 * server program full path name
79 * server program arguments maximum of MAXARGS (20)
81 * For non-RPC services, the "service name" can be of the form
82 * hostaddress:servicename, in which case the hostaddress is used
83 * as the host portion of the address to listen on. If hostaddress
84 * consists of a single `*' character, INADDR_ANY is used.
86 * A line can also consist of just
88 * where hostaddress is as in the preceding paragraph. Such a line must
89 * have no further fields; the specified hostaddress is remembered and
90 * used for all further lines that have no hostaddress specified,
91 * until the next such line (or EOF). (This is why * is provided to
92 * allow explicit specification of INADDR_ANY.) A line
94 * is implicitly in effect at the beginning of the file.
96 * The hostaddress specifier may (and often will) contain dots;
97 * the service name must not.
99 * For RPC services, host-address specifiers are accepted and will
100 * work to some extent; however, because of limitations in the
101 * portmapper interface, it will not work to try to give more than
102 * one line for any given RPC service, even if the host-address
103 * specifiers are different.
105 * Comment lines are indicated by a `#' in column 1.
109 * Here's the scoop concerning the user[.:]group feature:
111 * 1) set-group-option off.
113 * a) user = root: NO setuid() or setgid() is done
115 * b) other: setgid(primary group as found in passwd)
116 * initgroups(name, primary group)
119 * 2) set-group-option on.
121 * a) user = root: setgid(specified group)
125 * b) other: setgid(specified group)
126 * initgroups(name, specified group)
135 //#define CONFIG_FEATURE_INETD_RPC
136 //#define CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
137 //#define CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
138 //#define CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_TIME
139 //#define CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
140 //#define CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
141 //#define CONFIG_FEATURE_IPV6
143 #ifdef CONFIG_FEATURE_INETD_RPC
145 #include <rpc/pmap_clnt.h>
148 #define _PATH_INETDCONF "/etc/inetd.conf"
149 #define _PATH_INETDPID "/var/run/inetd.pid"
152 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */
153 #define RETRYTIME (60*10) /* retry after bind or server fail */
155 #ifndef RLIMIT_NOFILE
156 #define RLIMIT_NOFILE RLIMIT_OFILE
163 /* Reserve some descriptors, 3 stdio + at least: 1 log, 1 conf. file */
164 #define FD_MARGIN (8)
165 static rlim_t rlim_ofile_cur = OPEN_MAX;
166 static struct rlimit rlim_ofile;
169 /* Check unsupporting builtin */
170 #if defined CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_ECHO || \
171 defined CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD || \
172 defined CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_TIME || \
173 defined CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME || \
174 defined CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
175 # define INETD_FEATURE_ENABLED
178 #if defined CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_ECHO || \
179 defined CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD || \
180 defined CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
181 # define INETD_SETPROCTITLE
184 typedef struct servtab {
185 char *se_hostaddr; /* host address to listen on */
186 char *se_service; /* name of service */
187 int se_socktype; /* type of socket to use */
188 int se_family; /* address family */
189 char *se_proto; /* protocol used */
190 #ifdef CONFIG_FEATURE_INETD_RPC
191 int se_rpcprog; /* rpc program number */
192 int se_rpcversl; /* rpc program lowest version */
193 int se_rpcversh; /* rpc program highest version */
194 #define isrpcservice(sep) ((sep)->se_rpcversl != 0)
196 #define isrpcservice(sep) 0
198 pid_t se_wait; /* single threaded server */
199 short se_checked; /* looked at during merge */
200 char *se_user; /* user name to run as */
201 char *se_group; /* group name to run as */
202 #ifdef INETD_FEATURE_ENABLED
203 const struct builtin *se_bi; /* if built-in, description */
205 char *se_server; /* server program */
207 char *se_argv[MAXARGV + 1]; /* program arguments */
208 int se_fd; /* open descriptor */
210 struct sockaddr se_un_ctrladdr;
211 struct sockaddr_in se_un_ctrladdr_in;
212 #ifdef CONFIG_FEATURE_IPV6
213 struct sockaddr_in6 se_un_ctrladdr_in6;
215 struct sockaddr_un se_un_ctrladdr_un;
216 } se_un; /* bound address */
217 #define se_ctrladdr se_un.se_un_ctrladdr
218 #define se_ctrladdr_in se_un.se_un_ctrladdr_in
219 #define se_ctrladdr_in6 se_un.se_un_ctrladdr_in6
220 #define se_ctrladdr_un se_un.se_un_ctrladdr_un
221 int se_ctrladdr_size;
222 int se_max; /* max # of instances of this service */
223 int se_count; /* number started since se_time */
224 struct timeval se_time; /* start of se_count */
225 struct servtab *se_next;
228 static servtab_t *servtab;
230 #ifdef INETD_FEATURE_ENABLED
232 const char *bi_service; /* internally provided service name */
233 int bi_socktype; /* type of socket supported */
234 short bi_fork; /* 1 if should fork before call */
235 short bi_wait; /* 1 if should wait for child */
236 void (*bi_fn) (int, servtab_t *);
239 /* Echo received data */
240 #ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
241 static void echo_stream(int, servtab_t *);
242 static void echo_dg(int, servtab_t *);
244 /* Internet /dev/null */
245 #ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
246 static void discard_stream(int, servtab_t *);
247 static void discard_dg(int, servtab_t *);
249 /* Return 32 bit time since 1900 */
250 #ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_TIME
251 static void machtime_stream(int, servtab_t *);
252 static void machtime_dg(int, servtab_t *);
254 /* Return human-readable time */
255 #ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
256 static void daytime_stream(int, servtab_t *);
257 static void daytime_dg(int, servtab_t *);
259 /* Familiar character generator */
260 #ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
261 static void chargen_stream(int, servtab_t *);
262 static void chargen_dg(int, servtab_t *);
265 static const struct builtin builtins[] = {
266 #ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
267 /* Echo received data */
268 {"echo", SOCK_STREAM, 1, 0, echo_stream,},
269 {"echo", SOCK_DGRAM, 0, 0, echo_dg,},
271 #ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
272 /* Internet /dev/null */
273 {"discard", SOCK_STREAM, 1, 0, discard_stream,},
274 {"discard", SOCK_DGRAM, 0, 0, discard_dg,},
276 #ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_TIME
277 /* Return 32 bit time since 1900 */
278 {"time", SOCK_STREAM, 0, 0, machtime_stream,},
279 {"time", SOCK_DGRAM, 0, 0, machtime_dg,},
281 #ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
282 /* Return human-readable time */
283 {"daytime", SOCK_STREAM, 0, 0, daytime_stream,},
284 {"daytime", SOCK_DGRAM, 0, 0, daytime_dg,},
286 #ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
287 /* Familiar character generator */
288 {"chargen", SOCK_STREAM, 1, 0, chargen_stream,},
289 {"chargen", SOCK_DGRAM, 0, 0, chargen_dg,},
291 {NULL, 0, 0, 0, NULL}
293 #endif /* INETD_FEATURE_ENABLED */
295 static int global_queuelen = 128;
296 static int nsock, maxsock;
297 static fd_set allsock;
299 static int timingout;
300 static struct servent *sp;
303 static char *CONFIG = _PATH_INETDCONF;
305 static FILE *fconfig;
306 static char line[1024];
307 static char *defhost;
309 /* xstrdup(NULL) returns NULL, but this one
310 * will return newly-allocated "" if called with NULL arg
311 * TODO: audit whether this makes any real difference
313 static char *xxstrdup(char *cp)
315 return xstrdup(cp ? cp : "");
318 static int setconfig(void)
321 defhost = xstrdup("*");
322 if (fconfig != NULL) {
323 fseek(fconfig, 0L, SEEK_SET);
326 fconfig = fopen(CONFIG, "r");
327 return (fconfig != NULL);
330 static void endconfig(void)
333 (void) fclose(fconfig);
340 #ifdef CONFIG_FEATURE_INETD_RPC
341 static void register_rpc(servtab_t *sep)
344 struct sockaddr_in ir_sin;
348 if ((pp = getprotobyname(sep->se_proto + 4)) == NULL) {
349 bb_perror_msg("%s: getproto", sep->se_proto);
352 size = sizeof ir_sin;
353 if (getsockname(sep->se_fd, (struct sockaddr *) &ir_sin, &size) < 0) {
354 bb_perror_msg("%s/%s: getsockname",
355 sep->se_service, sep->se_proto);
359 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) {
360 (void) pmap_unset(sep->se_rpcprog, n);
361 if (!pmap_set(sep->se_rpcprog, n, pp->p_proto, ntohs(ir_sin.sin_port)))
362 bb_perror_msg("%s %s: pmap_set: %u %u %u %u",
363 sep->se_service, sep->se_proto,
364 sep->se_rpcprog, n, pp->p_proto, ntohs(ir_sin.sin_port));
368 static void unregister_rpc(servtab_t *sep)
372 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) {
373 if (!pmap_unset(sep->se_rpcprog, n))
374 bb_error_msg("pmap_unset(%u, %u)", sep->se_rpcprog, n);
377 #endif /* CONFIG_FEATURE_INETD_RPC */
379 static void freeconfig(servtab_t *cp)
383 free(cp->se_hostaddr);
384 free(cp->se_service);
389 for (i = 0; i < MAXARGV; i++)
390 free(cp->se_argv[i]);
393 static int bump_nofile (void)
399 if (getrlimit (RLIMIT_NOFILE, &rl) < 0) {
400 bb_perror_msg("getrlimit");
403 rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK);
404 rl.rlim_cur = MIN(FD_SETSIZE, rl.rlim_cur + FD_CHUNK);
405 if (rl.rlim_cur <= rlim_ofile_cur) {
406 bb_error_msg("bump_nofile: cannot extend file limit, max = %d",
411 if (setrlimit(RLIMIT_NOFILE, &rl) < 0) {
412 bb_perror_msg("setrlimit");
416 rlim_ofile_cur = rl.rlim_cur;
420 static void setup(servtab_t *sep)
425 sep->se_fd = socket(sep->se_family, sep->se_socktype, 0);
426 if (sep->se_fd < 0) {
427 bb_perror_msg("%s/%s: socket", sep->se_service, sep->se_proto);
430 #define turnon(fd, opt) \
431 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof(on))
432 if (turnon(sep->se_fd, SO_REUSEADDR) < 0)
433 bb_perror_msg("setsockopt(SO_REUSEADDR)");
436 #ifdef CONFIG_FEATURE_INETD_RPC
437 if (isrpcservice(sep)) {
441 * for RPC services, attempt to use a reserved port
442 * if they are going to be running as root.
444 * Also, zero out the port for all RPC services; let bind()
447 sep->se_ctrladdr_in.sin_port = 0;
448 if (sep->se_user && (pwd = getpwnam(sep->se_user)) &&
449 pwd->pw_uid == 0 && uid == 0)
450 r = bindresvport(sep->se_fd, &sep->se_ctrladdr_in);
452 r = bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size);
454 socklen_t len = sep->se_ctrladdr_size;
455 int saveerrno = errno;
457 /* update se_ctrladdr_in.sin_port */
458 r = getsockname(sep->se_fd, &sep->se_ctrladdr, &len);
465 r = bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size);
467 bb_perror_msg("%s/%s (%d): bind",
468 sep->se_service, sep->se_proto, sep->se_ctrladdr.sa_family);
477 if (sep->se_socktype == SOCK_STREAM)
478 listen(sep->se_fd, global_queuelen);
480 FD_SET(sep->se_fd, &allsock);
482 if (sep->se_fd > maxsock) {
483 maxsock = sep->se_fd;
484 if ((rlim_t)maxsock > rlim_ofile_cur - FD_MARGIN)
489 static char *nextline(void)
494 if (fgets(line, sizeof(line), fd) == NULL)
496 cp = strchr(line, '\n');
502 static char *skip(char **cpp) /* int report; */
510 /* bb_error_msg("syntax error in inetd config file"); */
515 while (*cp == ' ' || *cp == '\t')
521 (void) ungetc(c, fconfig);
522 if (c == ' ' || c == '\t')
523 if ((cp = nextline()))
530 while (*cp && *cp != ' ' && *cp != '\t')
534 /* if ((*cpp = cp) == NULL) */
541 static servtab_t *new_servtab(void)
543 return xmalloc(sizeof(servtab_t));
546 static servtab_t *dupconfig(servtab_t *sep)
551 newtab = new_servtab();
552 memset(newtab, 0, sizeof(servtab_t));
553 newtab->se_service = xstrdup(sep->se_service);
554 newtab->se_socktype = sep->se_socktype;
555 newtab->se_family = sep->se_family;
556 newtab->se_proto = xstrdup(sep->se_proto);
557 #ifdef CONFIG_FEATURE_INETD_RPC
558 newtab->se_rpcprog = sep->se_rpcprog;
559 newtab->se_rpcversl = sep->se_rpcversl;
560 newtab->se_rpcversh = sep->se_rpcversh;
562 newtab->se_wait = sep->se_wait;
563 newtab->se_user = xstrdup(sep->se_user);
564 newtab->se_group = xstrdup(sep->se_group);
565 #ifdef INETD_FEATURE_ENABLED
566 newtab->se_bi = sep->se_bi;
568 newtab->se_server = xstrdup(sep->se_server);
570 for (argc = 0; argc <= MAXARGV; argc++)
571 newtab->se_argv[argc] = xstrdup(sep->se_argv[argc]);
572 newtab->se_max = sep->se_max;
577 static servtab_t *getconfigent(void)
588 /* memset(sep, 0, sizeof *sep); */
590 /* freeconfig(sep); */
592 while ((cp = nextline()) && *cp == '#') /* skip comment line */;
598 memset((char *) sep, 0, sizeof *sep);
605 /* Check for a host name. */
606 hostdelim = strrchr(arg, ':');
609 sep->se_hostaddr = xstrdup(arg);
612 * If the line is of the form `host:', then just change the
613 * default host for the following lines.
619 defhost = sep->se_hostaddr;
624 sep->se_hostaddr = xxstrdup(defhost);
626 sep->se_service = xxstrdup(arg);
629 if (strcmp(arg, "stream") == 0)
630 sep->se_socktype = SOCK_STREAM;
631 else if (strcmp(arg, "dgram") == 0)
632 sep->se_socktype = SOCK_DGRAM;
633 else if (strcmp(arg, "rdm") == 0)
634 sep->se_socktype = SOCK_RDM;
635 else if (strcmp(arg, "seqpacket") == 0)
636 sep->se_socktype = SOCK_SEQPACKET;
637 else if (strcmp(arg, "raw") == 0)
638 sep->se_socktype = SOCK_RAW;
640 sep->se_socktype = -1;
642 sep->se_proto = xxstrdup(skip(&cp));
644 if (strcmp(sep->se_proto, "unix") == 0) {
645 sep->se_family = AF_UNIX;
647 sep->se_family = AF_INET;
648 if (sep->se_proto[strlen(sep->se_proto) - 1] == '6')
649 #ifdef CONFIG_FEATURE_IPV6
650 sep->se_family = AF_INET6;
652 bb_error_msg("%s: IPV6 not supported", sep->se_proto);
654 if (strncmp(sep->se_proto, "rpc/", 4) == 0) {
655 #ifdef CONFIG_FEATURE_INETD_RPC
659 p = strchr(sep->se_service, '/');
661 bb_error_msg("%s: no rpc version", sep->se_service);
665 l = strtol(p, &ccp, 0);
666 if (ccp == p || l < 0 || l > INT_MAX) {
668 bb_error_msg("%s/%s: bad rpc version", sep->se_service, p);
671 sep->se_rpcversl = sep->se_rpcversh = l;
674 l = strtol(p, &ccp, 0);
675 if (ccp == p || l < 0 || l > INT_MAX || l < sep->se_rpcversl || *ccp)
677 sep->se_rpcversh = l;
678 } else if (*ccp != '\0')
681 bb_error_msg("%s: rpc services not supported", sep->se_service);
690 char *s = strchr(arg, '.');
693 sep->se_max = xatoi(s);
695 sep->se_max = toomany;
697 sep->se_wait = strcmp(arg, "wait") == 0;
698 /* if ((arg = skip(&cp, 1)) == NULL) */
700 sep->se_user = xxstrdup(skip(&cp));
701 arg = strchr(sep->se_user, '.');
703 arg = strchr(sep->se_user, ':');
706 sep->se_group = xstrdup(arg);
708 /* if ((arg = skip(&cp, 1)) == NULL) */
711 sep->se_server = xxstrdup(skip(&cp));
712 if (strcmp(sep->se_server, "internal") == 0) {
713 #ifdef INETD_FEATURE_ENABLED
714 const struct builtin *bi;
716 for (bi = builtins; bi->bi_service; bi++)
717 if (bi->bi_socktype == sep->se_socktype &&
718 strcmp(bi->bi_service, sep->se_service) == 0)
720 if (bi->bi_service == 0) {
721 bb_error_msg("internal service %s unknown", sep->se_service);
725 sep->se_wait = bi->bi_wait;
727 bb_perror_msg("internal service %s unknown", sep->se_service);
731 #ifdef INETD_FEATURE_ENABLED
736 for (arg = skip(&cp); cp; arg = skip(&cp)) {
738 sep->se_argv[argc++] = xxstrdup(arg);
740 while (argc <= MAXARGV)
741 sep->se_argv[argc++] = NULL;
744 * Now that we've processed the entire line, check if the hostname
745 * specifier was a comma separated list of hostnames. If so
746 * we'll make new entries for each address.
748 while ((hostdelim = strrchr(sep->se_hostaddr, ',')) != NULL) {
749 nsep = dupconfig(sep);
752 * NULL terminate the hostname field of the existing entry,
753 * and make a dup for the new entry.
756 nsep->se_hostaddr = xstrdup(hostdelim);
758 nsep->se_next = sep->se_next;
763 while (nsep != NULL) {
764 nsep->se_checked = 1;
765 if (nsep->se_family == AF_INET) {
766 if (!strcmp(nsep->se_hostaddr, "*"))
767 nsep->se_ctrladdr_in.sin_addr.s_addr = INADDR_ANY;
768 else if (!inet_aton(nsep->se_hostaddr, &nsep->se_ctrladdr_in.sin_addr)) {
771 hp = gethostbyname(nsep->se_hostaddr);
773 bb_error_msg("%s: unknown host", nsep->se_hostaddr);
774 nsep->se_checked = 0;
776 } else if (hp->h_addrtype != AF_INET) {
777 bb_error_msg("%s: address isn't an Internet "
778 "address", nsep->se_hostaddr);
779 nsep->se_checked = 0;
784 memmove(&nsep->se_ctrladdr_in.sin_addr,
785 hp->h_addr_list[0], sizeof(struct in_addr));
786 while (hp->h_addr_list[i] != NULL) {
787 psep = dupconfig(nsep);
788 psep->se_hostaddr = xxstrdup(nsep->se_hostaddr);
789 psep->se_checked = 1;
790 memmove(&psep->se_ctrladdr_in.sin_addr,
791 hp->h_addr_list[i], sizeof(struct in_addr));
792 psep->se_ctrladdr_size = sizeof(psep->se_ctrladdr_in);
794 /* Prepend to list, don't want to look up */
795 /* its hostname again. */
802 /* XXX BUG?: is this skip: label supposed to remain? */
804 nsep = nsep->se_next;
808 * Finally, free any entries which failed the gethostbyname
813 while (nsep != NULL) {
816 if (nsep->se_checked == 0) {
822 nsep = nsep->se_next;
823 psep->se_next = nsep;
827 nsep->se_checked = 0;
829 nsep = nsep->se_next;
836 #define Block_Using_Signals(m) do { \
838 sigaddset(&m, SIGCHLD); \
839 sigaddset(&m, SIGHUP); \
840 sigaddset(&m, SIGALRM); \
841 sigprocmask(SIG_BLOCK, &m, NULL); \
844 static servtab_t *enter(servtab_t *cp)
852 #ifdef CONFIG_FEATURE_INETD_RPC
853 sep->se_rpcprog = -1;
855 Block_Using_Signals(omask);
856 sep->se_next = servtab;
858 sigprocmask(SIG_UNBLOCK, &omask, NULL);
862 static int matchconf(servtab_t *old, servtab_t *new)
864 if (strcmp(old->se_service, new->se_service) != 0)
867 if (strcmp(old->se_hostaddr, new->se_hostaddr) != 0)
870 if (strcmp(old->se_proto, new->se_proto) != 0)
874 * If the new servtab is bound to a specific address, check that the
875 * old servtab is bound to the same entry. If the new service is not
876 * bound to a specific address then the check of se_hostaddr above
880 if (old->se_family == AF_INET && new->se_family == AF_INET &&
881 memcmp(&old->se_ctrladdr_in.sin_addr,
882 &new->se_ctrladdr_in.sin_addr,
883 sizeof(new->se_ctrladdr_in.sin_addr)) != 0)
886 #ifdef CONFIG_FEATURE_IPV6
887 if (old->se_family == AF_INET6 && new->se_family == AF_INET6 &&
888 memcmp(&old->se_ctrladdr_in6.sin6_addr,
889 &new->se_ctrladdr_in6.sin6_addr,
890 sizeof(new->se_ctrladdr_in6.sin6_addr)) != 0)
896 static void config(int sig ATTRIBUTE_UNUSED)
898 servtab_t *sep, *cp, **sepp;
904 bb_perror_msg("%s", CONFIG);
907 for (sep = servtab; sep; sep = sep->se_next)
911 for (sep = servtab; sep; sep = sep->se_next)
912 if (matchconf(sep, cp))
918 #define SWAP(type, a, b) do {type c=(type)a; a=(type)b; b=(type)c;} while (0)
920 Block_Using_Signals(omask);
922 * sep->se_wait may be holding the pid of a daemon
923 * that we're waiting for. If so, don't overwrite
924 * it unless the config file explicitly says don't
928 #ifdef INETD_FEATURE_ENABLED
931 (sep->se_wait == 1 || cp->se_wait == 0))
932 sep->se_wait = cp->se_wait;
933 SWAP(int, cp->se_max, sep->se_max);
934 SWAP(char *, sep->se_user, cp->se_user);
935 SWAP(char *, sep->se_group, cp->se_group);
936 SWAP(char *, sep->se_server, cp->se_server);
937 for (i = 0; i < MAXARGV; i++)
938 SWAP(char *, sep->se_argv[i], cp->se_argv[i]);
941 #ifdef CONFIG_FEATURE_INETD_RPC
942 if (isrpcservice(sep))
944 sep->se_rpcversl = cp->se_rpcversl;
945 sep->se_rpcversh = cp->se_rpcversh;
947 sigprocmask(SIG_UNBLOCK, &omask, NULL);
954 switch (sep->se_family) {
956 if (sep->se_fd != -1)
958 (void) unlink(sep->se_service);
959 n = strlen(sep->se_service);
960 if (n > sizeof sep->se_ctrladdr_un.sun_path - 1)
961 n = sizeof sep->se_ctrladdr_un.sun_path - 1;
962 safe_strncpy(sep->se_ctrladdr_un.sun_path, sep->se_service, n + 1);
963 sep->se_ctrladdr_un.sun_family = AF_UNIX;
964 sep->se_ctrladdr_size = n + sizeof sep->se_ctrladdr_un.sun_family;
968 sep->se_ctrladdr_in.sin_family = AF_INET;
969 /* se_ctrladdr_in was set in getconfigent */
970 sep->se_ctrladdr_size = sizeof sep->se_ctrladdr_in;
972 #ifdef CONFIG_FEATURE_INETD_RPC
973 if (isrpcservice(sep)) {
975 // FIXME: atoi_or_else(str, 0) would be handy here
976 sep->se_rpcprog = atoi(sep->se_service);
977 if (sep->se_rpcprog == 0) {
978 rp = getrpcbyname(sep->se_service);
980 bb_error_msg("%s: unknown rpc service", sep->se_service);
983 sep->se_rpcprog = rp->r_number;
985 if (sep->se_fd == -1)
987 if (sep->se_fd != -1)
992 u_short port = htons(atoi(sep->se_service));
993 // FIXME: atoi_or_else(str, 0) would be handy here
995 /*XXX*/ strncpy(protoname, sep->se_proto, sizeof(protoname));
996 if (isdigit(protoname[strlen(protoname) - 1]))
997 protoname[strlen(protoname) - 1] = '\0';
998 sp = getservbyname(sep->se_service, protoname);
1000 bb_error_msg("%s/%s: unknown service",
1001 sep->se_service, sep->se_proto);
1006 if (port != sep->se_ctrladdr_in.sin_port) {
1007 sep->se_ctrladdr_in.sin_port = port;
1008 if (sep->se_fd != -1) {
1009 FD_CLR(sep->se_fd, &allsock);
1011 (void) close(sep->se_fd);
1015 if (sep->se_fd == -1)
1019 #ifdef CONFIG_FEATURE_IPV6
1021 sep->se_ctrladdr_in6.sin6_family = AF_INET6;
1022 /* se_ctrladdr_in was set in getconfigent */
1023 sep->se_ctrladdr_size = sizeof sep->se_ctrladdr_in6;
1025 #ifdef CONFIG_FEATURE_INETD_RPC
1026 if (isrpcservice(sep)) {
1029 sep->se_rpcprog = atoi(sep->se_service);
1030 if (sep->se_rpcprog == 0) {
1031 rp = getrpcbyname(sep->se_service);
1033 bb_error_msg("%s: unknown rpc service", sep->se_service);
1036 sep->se_rpcprog = rp->r_number;
1038 if (sep->se_fd == -1)
1040 if (sep->se_fd != -1)
1045 u_short port = htons(atoi(sep->se_service));
1048 /*XXX*/ strncpy(protoname, sep->se_proto, sizeof(protoname));
1049 if (isdigit(protoname[strlen(protoname) - 1]))
1050 protoname[strlen(protoname) - 1] = '\0';
1051 sp = getservbyname(sep->se_service, protoname);
1053 bb_error_msg("%s/%s: unknown service",
1054 sep->se_service, sep->se_proto);
1059 if (port != sep->se_ctrladdr_in6.sin6_port) {
1060 sep->se_ctrladdr_in6.sin6_port = port;
1061 if (sep->se_fd != -1) {
1062 FD_CLR(sep->se_fd, &allsock);
1064 (void) close(sep->se_fd);
1068 if (sep->se_fd == -1)
1072 #endif /* CONFIG_FEATURE_IPV6 */
1075 if (cp->se_next != NULL) {
1076 servtab_t *tmp = cp;
1082 cp = getconfigent();
1087 * Purge anything not looked at above.
1089 Block_Using_Signals(omask);
1091 while ((sep = *sepp)) {
1092 if (sep->se_checked) {
1093 sepp = &sep->se_next;
1096 *sepp = sep->se_next;
1097 if (sep->se_fd != -1) {
1098 FD_CLR(sep->se_fd, &allsock);
1100 (void) close(sep->se_fd);
1102 #ifdef CONFIG_FEATURE_INETD_RPC
1103 if (isrpcservice(sep))
1104 unregister_rpc(sep);
1106 if (sep->se_family == AF_UNIX)
1107 (void) unlink(sep->se_service);
1111 sigprocmask(SIG_UNBLOCK, &omask, NULL);
1115 static void reapchild(int sig ATTRIBUTE_UNUSED)
1118 int save_errno = errno, status;
1122 pid = wait3(&status, WNOHANG, NULL);
1125 for (sep = servtab; sep; sep = sep->se_next)
1126 if (sep->se_wait == pid) {
1127 if (WIFEXITED(status) && WEXITSTATUS(status))
1128 bb_error_msg("%s: exit status 0x%x",
1129 sep->se_server, WEXITSTATUS(status));
1130 else if (WIFSIGNALED(status))
1131 bb_error_msg("%s: exit signal 0x%x",
1132 sep->se_server, WTERMSIG(status));
1134 FD_SET(sep->se_fd, &allsock);
1141 static void retry(int sig ATTRIBUTE_UNUSED)
1146 for (sep = servtab; sep; sep = sep->se_next) {
1147 if (sep->se_fd == -1) {
1148 switch (sep->se_family) {
1151 #ifdef CONFIG_FEATURE_IPV6
1155 #ifdef CONFIG_FEATURE_INETD_RPC
1156 if (sep->se_fd != -1 && isrpcservice(sep))
1165 static void goaway(int sig ATTRIBUTE_UNUSED)
1169 /* XXX signal race walking sep list */
1170 for (sep = servtab; sep; sep = sep->se_next) {
1171 if (sep->se_fd == -1)
1174 switch (sep->se_family) {
1176 (void) unlink(sep->se_service);
1179 #ifdef CONFIG_FEATURE_IPV6
1182 #ifdef CONFIG_FEATURE_INETD_RPC
1183 if (sep->se_wait == 1 && isrpcservice(sep))
1184 unregister_rpc(sep); /* XXX signal race */
1188 (void) close(sep->se_fd);
1190 (void) unlink(_PATH_INETDPID);
1195 #ifdef INETD_SETPROCTITLE
1197 static char *LastArg;
1200 inetd_setproctitle(char *a, int s)
1204 struct sockaddr_in prt_sin;
1208 size = sizeof(prt_sin);
1209 (void) snprintf(buf, sizeof buf, "-%s", a);
1210 if (getpeername(s, (struct sockaddr *) &prt_sin, &size) == 0) {
1211 char *sa = inet_ntoa(prt_sin.sin_addr);
1213 buf[sizeof(buf) - 1 - strlen(sa) - 3] = '\0';
1218 strncpy(cp, buf, LastArg - cp);
1220 while (cp < LastArg)
1227 inetd_main(int argc, char *argv[])
1231 struct group *grp = NULL;
1233 struct sigaction sa, sapipe;
1238 sigset_t omask, wait_mask;
1240 #ifdef INETD_SETPROCTITLE
1241 extern char **environ;
1242 char **envp = environ;
1245 if (envp == 0 || *envp == 0)
1249 LastArg = envp[-1] + strlen(envp[-1]);
1252 openlog(applet_name, LOG_PID | LOG_NOWAIT, LOG_DAEMON);
1254 opt = getopt32(argc, argv, "R:f", &stoomany);
1256 toomany = xatoi_u(stoomany);
1267 bb_error_msg_and_die("non-root must specify a config file");
1271 /* reexec for vfork() do continue parent */
1272 vfork_daemon_rexec(0, 0, argc, argv, "-f");
1279 logmode = LOGMODE_SYSLOG;
1282 gid_t gid = getgid();
1284 /* If run by hand, ensure groups vector gets trashed */
1289 FILE *fp = fopen(_PATH_INETDPID, "w");
1292 fprintf(fp, "%u\n", getpid());
1297 if (getrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) {
1298 bb_perror_msg("getrlimit");
1300 rlim_ofile_cur = rlim_ofile.rlim_cur;
1301 if (rlim_ofile_cur == RLIM_INFINITY) /* ! */
1302 rlim_ofile_cur = OPEN_MAX;
1305 memset((char *) &sa, 0, sizeof(sa));
1306 sigemptyset(&sa.sa_mask);
1307 sigaddset(&sa.sa_mask, SIGALRM);
1308 sigaddset(&sa.sa_mask, SIGCHLD);
1309 sigaddset(&sa.sa_mask, SIGHUP);
1310 sa.sa_handler = retry;
1311 sigaction(SIGALRM, &sa, NULL);
1313 sa.sa_handler = config;
1314 sigaction(SIGHUP, &sa, NULL);
1315 sa.sa_handler = reapchild;
1316 sigaction(SIGCHLD, &sa, NULL);
1317 sa.sa_handler = goaway;
1318 sigaction(SIGTERM, &sa, NULL);
1319 sa.sa_handler = goaway;
1320 sigaction(SIGINT, &sa, NULL);
1321 sa.sa_handler = SIG_IGN;
1322 sigaction(SIGPIPE, &sa, &sapipe);
1323 memset(&wait_mask, 0, sizeof(wait_mask));
1325 /* space for daemons to overwrite environment for ps */
1326 #define DUMMYSIZE 100
1327 char dummy[DUMMYSIZE];
1329 (void) memset(dummy, 'x', DUMMYSIZE - 1);
1330 dummy[DUMMYSIZE - 1] = '\0';
1332 (void) setenv("inetd_dummy", dummy, 1);
1340 Block_Using_Signals(omask);
1342 sigsuspend(&wait_mask);
1343 sigprocmask(SIG_UNBLOCK, &omask, NULL);
1347 n = select(maxsock + 1, &readable, NULL, NULL, NULL);
1349 if (n < 0 && errno != EINTR) {
1350 bb_perror_msg("select");
1356 for (sep = servtab; n && sep; sep = sep->se_next) {
1357 if (sep->se_fd == -1 || !FD_ISSET(sep->se_fd, &readable))
1361 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) {
1362 ctrl = accept(sep->se_fd, NULL, NULL);
1366 bb_perror_msg("accept (for %s)", sep->se_service);
1369 if (sep->se_family == AF_INET && sep->se_socktype == SOCK_STREAM) {
1370 struct sockaddr_in peer;
1371 socklen_t plen = sizeof(peer);
1373 if (getpeername(ctrl, (struct sockaddr *) &peer, &plen) < 0) {
1374 bb_error_msg("cannot getpeername");
1378 if (ntohs(peer.sin_port) == 20) {
1379 /* XXX ftp bounce */
1387 Block_Using_Signals(omask);
1389 #ifdef INETD_FEATURE_ENABLED
1390 if (sep->se_bi == 0 || sep->se_bi->bi_fork)
1393 if (sep->se_count++ == 0)
1394 (void) gettimeofday(&sep->se_time, NULL);
1395 else if (toomany > 0 && sep->se_count >= sep->se_max) {
1398 (void) gettimeofday(&now, NULL);
1399 if (now.tv_sec - sep->se_time.tv_sec > CNT_INTVL) {
1403 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
1405 if (sep->se_family == AF_INET &&
1406 ntohs(sep->se_ctrladdr_in.sin_port) >= IPPORT_RESERVED) {
1408 * Cannot close it -- there are
1409 * thieves on the system.
1410 * Simply ignore the connection.
1415 bb_error_msg("%s/%s server failing (looping), service terminated",
1416 sep->se_service, sep->se_proto);
1417 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
1419 FD_CLR(sep->se_fd, &allsock);
1420 (void) close(sep->se_fd);
1424 sigprocmask(SIG_UNBLOCK, &omask, NULL);
1435 bb_perror_msg("fork");
1436 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
1438 sigprocmask(SIG_UNBLOCK, &omask, NULL);
1442 if (pid && sep->se_wait) {
1444 FD_CLR(sep->se_fd, &allsock);
1447 sigprocmask(SIG_UNBLOCK, &omask, NULL);
1449 #ifdef INETD_FEATURE_ENABLED
1451 (*sep->se_bi->bi_fn)(ctrl, sep);
1455 pwd = getpwnam(sep->se_user);
1457 bb_error_msg("getpwnam: %s: no such user", sep->se_user);
1461 bb_perror_msg("%s: setsid", sep->se_service);
1462 if (sep->se_group && (grp = getgrnam(sep->se_group)) == NULL) {
1463 bb_error_msg("getgrnam: %s: no such group", sep->se_group);
1467 /* a user running private inetd */
1468 if (uid != pwd->pw_uid)
1470 } else if (pwd->pw_uid) {
1472 pwd->pw_gid = grp->gr_gid;
1473 xsetgid((gid_t) pwd->pw_gid);
1474 initgroups(pwd->pw_name, pwd->pw_gid);
1475 xsetuid((uid_t) pwd->pw_uid);
1476 } else if (sep->se_group) {
1477 xsetgid(grp->gr_gid);
1478 setgroups(1, &grp->gr_gid);
1481 if (ctrl) close(ctrl);
1484 if (rlim_ofile.rlim_cur != rlim_ofile_cur)
1485 if (setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0)
1486 bb_perror_msg("setrlimit");
1488 for (tmpint = rlim_ofile_cur - 1; --tmpint > 2;)
1489 (void) close(tmpint);
1490 sigaction(SIGPIPE, &sapipe, NULL);
1491 execv(sep->se_server, sep->se_argv);
1492 bb_perror_msg("execv %s", sep->se_server);
1494 if (sep->se_socktype != SOCK_STREAM)
1495 recv(0, buf, sizeof(buf), 0);
1499 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
1501 } /* for (sep = servtab...) */
1506 * Internet services provided internally by inetd:
1508 #define BUFSIZE 4096
1510 #if defined(CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_ECHO) || \
1511 defined(CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN) || \
1512 defined(CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME)
1513 static int dg_badinput(struct sockaddr_in *dg_sin)
1515 if (ntohs(dg_sin->sin_port) < IPPORT_RESERVED)
1517 if (dg_sin->sin_addr.s_addr == htonl(INADDR_BROADCAST))
1519 /* XXX compare against broadcast addresses in SIOCGIFCONF list? */
1524 #ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
1525 /* Echo service -- echo data back */
1528 echo_stream(int s, servtab_t *sep)
1530 char buffer[BUFSIZE];
1533 inetd_setproctitle(sep->se_service, s);
1535 i = read(s, buffer, sizeof(buffer));
1537 /* FIXME: this isnt correct - safe_write()? */
1538 if (write(s, buffer, i) <= 0) break;
1543 /* Echo service -- echo data back */
1546 echo_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
1548 char buffer[BUFSIZE];
1551 /* struct sockaddr_storage ss; */
1555 i = recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size);
1558 if (dg_badinput((struct sockaddr_in *) &sa))
1560 (void) sendto(s, buffer, i, 0, &sa, sizeof(sa));
1562 #endif /* CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_ECHO */
1564 #ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
1565 /* Discard service -- ignore data */
1568 discard_stream(int s, servtab_t *sep)
1570 char buffer[BUFSIZE];
1572 inetd_setproctitle(sep->se_service, s);
1575 if (read(s, buffer, sizeof(buffer)) <= 0 && errno != EINTR)
1580 /* Discard service -- ignore data */
1583 discard_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
1585 char buffer[BUFSIZE];
1587 (void) read(s, buffer, sizeof(buffer));
1589 #endif /* CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD */
1592 #ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
1594 static char ring[128];
1595 static char *endring;
1604 for (i = 0; i <= 128; ++i)
1609 /* Character generator */
1612 chargen_stream(int s, servtab_t *sep)
1616 char text[LINESIZ + 2];
1618 inetd_setproctitle(sep->se_service, s);
1625 text[LINESIZ] = '\r';
1626 text[LINESIZ + 1] = '\n';
1631 memmove(text, rs, LINESIZ);
1633 memmove(text, rs, len);
1634 memmove(text + len, ring, LINESIZ - len);
1636 if (++rs == endring)
1638 if (write(s, text, sizeof(text)) != sizeof(text))
1644 /* Character generator */
1647 chargen_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
1649 /* struct sockaddr_storage ss; */
1653 char text[LINESIZ + 2];
1662 if (recvfrom(s, text, sizeof(text), 0, &sa, &size) < 0)
1664 if (dg_badinput((struct sockaddr_in *) &sa))
1667 if ((len = endring - rs) >= LINESIZ)
1668 memmove(text, rs, LINESIZ);
1670 memmove(text, rs, len);
1671 memmove(text + len, ring, LINESIZ - len);
1673 if (++rs == endring)
1675 text[LINESIZ] = '\r';
1676 text[LINESIZ + 1] = '\n';
1677 (void) sendto(s, text, sizeof(text), 0, &sa, sizeof(sa));
1679 #endif /* CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN */
1682 #ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_TIME
1684 * Return a machine readable date and time, in the form of the
1685 * number of seconds since midnight, Jan 1, 1900. Since gettimeofday
1686 * returns the number of seconds since midnight, Jan 1, 1970,
1687 * we must add 2208988800 seconds to this figure to make up for
1688 * some seventy years Bell Labs was asleep.
1691 static u_int machtime(void)
1695 if (gettimeofday(&tv, NULL) < 0) {
1696 fprintf(stderr, "Unable to get time of day\n");
1699 return htonl((u_int) tv.tv_sec + 2208988800UL);
1704 machtime_stream(int s, servtab_t *sep ATTRIBUTE_UNUSED)
1708 result = machtime();
1709 (void) write(s, (char *) &result, sizeof(result));
1714 machtime_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
1717 /* struct sockaddr_storage ss; */
1719 struct sockaddr_in *dg_sin;
1723 if (recvfrom(s, (char *) &result, sizeof(result), 0, &sa, &size) < 0)
1725 /* if (dg_badinput((struct sockaddr *)&ss)) */
1726 dg_sin = (struct sockaddr_in *) &sa;
1727 if (dg_sin->sin_addr.s_addr == htonl(INADDR_BROADCAST) ||
1728 ntohs(dg_sin->sin_port) < IPPORT_RESERVED / 2)
1730 result = machtime();
1731 (void) sendto(s, (char *) &result, sizeof(result), 0, &sa, sizeof(sa));
1733 #endif /* CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_TIME */
1736 #ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
1737 /* Return human-readable time of day */
1739 static void daytime_stream(int s, servtab_t *sep ATTRIBUTE_UNUSED)
1746 (void) sprintf(buffer, "%.24s\r\n", ctime(&t));
1747 (void) write(s, buffer, strlen(buffer));
1750 /* Return human-readable time of day */
1753 daytime_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
1757 /* struct sockaddr_storage ss; */
1764 if (recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size) < 0)
1766 if (dg_badinput((struct sockaddr_in *) &sa))
1768 (void) sprintf(buffer, "%.24s\r\n", ctime(&t));
1769 (void) sendto(s, buffer, strlen(buffer), 0, &sa, sizeof(sa));
1771 #endif /* CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME */