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 TOOMANY 0 /* don't start more than TOOMANY */
154 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */
155 #define RETRYTIME (60*10) /* retry after bind or server fail */
157 #ifndef RLIMIT_NOFILE
158 #define RLIMIT_NOFILE RLIMIT_OFILE
165 /* Reserve some descriptors, 3 stdio + at least: 1 log, 1 conf. file */
166 #define FD_MARGIN (8)
167 static rlim_t rlim_ofile_cur = OPEN_MAX;
168 static struct rlimit rlim_ofile;
171 /* Check unsupporting builtin */
172 #if defined CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_ECHO || \
173 defined CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD || \
174 defined CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_TIME || \
175 defined CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME || \
176 defined CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
177 # define INETD_FEATURE_ENABLED
180 #if defined CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_ECHO || \
181 defined CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD || \
182 defined CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
183 # define INETD_SETPROCTITLE
186 typedef struct servtab {
187 char *se_hostaddr; /* host address to listen on */
188 char *se_service; /* name of service */
189 int se_socktype; /* type of socket to use */
190 int se_family; /* address family */
191 char *se_proto; /* protocol used */
192 #ifdef CONFIG_FEATURE_INETD_RPC
193 int se_rpcprog; /* rpc program number */
194 int se_rpcversl; /* rpc program lowest version */
195 int se_rpcversh; /* rpc program highest version */
196 #define isrpcservice(sep) ((sep)->se_rpcversl != 0)
198 #define isrpcservice(sep) 0
200 pid_t se_wait; /* single threaded server */
201 short se_checked; /* looked at during merge */
202 char *se_user; /* user name to run as */
203 char *se_group; /* group name to run as */
204 #ifdef INETD_FEATURE_ENABLED
205 const struct builtin *se_bi; /* if built-in, description */
207 char *se_server; /* server program */
209 char *se_argv[MAXARGV + 1]; /* program arguments */
210 int se_fd; /* open descriptor */
212 struct sockaddr se_un_ctrladdr;
213 struct sockaddr_in se_un_ctrladdr_in;
214 #ifdef CONFIG_FEATURE_IPV6
215 struct sockaddr_in6 se_un_ctrladdr_in6;
217 struct sockaddr_un se_un_ctrladdr_un;
218 } se_un; /* bound address */
219 #define se_ctrladdr se_un.se_un_ctrladdr
220 #define se_ctrladdr_in se_un.se_un_ctrladdr_in
221 #define se_ctrladdr_in6 se_un.se_un_ctrladdr_in6
222 #define se_ctrladdr_un se_un.se_un_ctrladdr_un
223 int se_ctrladdr_size;
224 int se_max; /* max # of instances of this service */
225 int se_count; /* number started since se_time */
226 struct timeval se_time; /* start of se_count */
227 struct servtab *se_next;
230 static servtab_t *servtab;
232 #ifdef INETD_FEATURE_ENABLED
234 const char *bi_service; /* internally provided service name */
235 int bi_socktype; /* type of socket supported */
236 short bi_fork; /* 1 if should fork before call */
237 short bi_wait; /* 1 if should wait for child */
238 void (*bi_fn) (int, servtab_t *);
241 /* Echo received data */
242 #ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
243 static void echo_stream(int, servtab_t *);
244 static void echo_dg(int, servtab_t *);
246 /* Internet /dev/null */
247 #ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
248 static void discard_stream(int, servtab_t *);
249 static void discard_dg(int, servtab_t *);
251 /* Return 32 bit time since 1900 */
252 #ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_TIME
253 static void machtime_stream(int, servtab_t *);
254 static void machtime_dg(int, servtab_t *);
256 /* Return human-readable time */
257 #ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
258 static void daytime_stream(int, servtab_t *);
259 static void daytime_dg(int, servtab_t *);
261 /* Familiar character generator */
262 #ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
263 static void chargen_stream(int, servtab_t *);
264 static void chargen_dg(int, servtab_t *);
267 static const struct builtin builtins[] = {
268 #ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
269 /* Echo received data */
270 {"echo", SOCK_STREAM, 1, 0, echo_stream,},
271 {"echo", SOCK_DGRAM, 0, 0, echo_dg,},
273 #ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
274 /* Internet /dev/null */
275 {"discard", SOCK_STREAM, 1, 0, discard_stream,},
276 {"discard", SOCK_DGRAM, 0, 0, discard_dg,},
278 #ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_TIME
279 /* Return 32 bit time since 1900 */
280 {"time", SOCK_STREAM, 0, 0, machtime_stream,},
281 {"time", SOCK_DGRAM, 0, 0, machtime_dg,},
283 #ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
284 /* Return human-readable time */
285 {"daytime", SOCK_STREAM, 0, 0, daytime_stream,},
286 {"daytime", SOCK_DGRAM, 0, 0, daytime_dg,},
288 #ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
289 /* Familiar character generator */
290 {"chargen", SOCK_STREAM, 1, 0, chargen_stream,},
291 {"chargen", SOCK_DGRAM, 0, 0, chargen_dg,},
293 {NULL, 0, 0, 0, NULL}
295 #endif /* INETD_FEATURE_ENABLED */
297 static int global_queuelen = 128;
298 static int nsock, maxsock;
299 static fd_set allsock;
300 static int toomany = TOOMANY;
301 static int timingout;
302 static struct servent *sp;
305 static char *CONFIG = _PATH_INETDCONF;
307 static FILE *fconfig;
308 static char line[1024];
309 static char *defhost;
311 /* xstrdup(NULL) returns NULL, but this one
312 * will return newly-allocated "" if called with NULL arg
313 * TODO: audit whether this makes any real difference
315 static char *xxstrdup(char *cp)
317 return xstrdup(cp ? cp : "");
320 static int setconfig(void)
323 defhost = xstrdup("*");
324 if (fconfig != NULL) {
325 fseek(fconfig, 0L, SEEK_SET);
328 fconfig = fopen(CONFIG, "r");
329 return (fconfig != NULL);
332 static void endconfig(void)
335 (void) fclose(fconfig);
342 #ifdef CONFIG_FEATURE_INETD_RPC
343 static void register_rpc(servtab_t *sep)
346 struct sockaddr_in ir_sin;
350 if ((pp = getprotobyname(sep->se_proto + 4)) == NULL) {
351 bb_perror_msg("%s: getproto", sep->se_proto);
354 size = sizeof ir_sin;
355 if (getsockname(sep->se_fd, (struct sockaddr *) &ir_sin, &size) < 0) {
356 bb_perror_msg("%s/%s: getsockname",
357 sep->se_service, sep->se_proto);
361 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) {
362 (void) pmap_unset(sep->se_rpcprog, n);
363 if (!pmap_set(sep->se_rpcprog, n, pp->p_proto, ntohs(ir_sin.sin_port)))
364 bb_perror_msg("%s %s: pmap_set: %u %u %u %u",
365 sep->se_service, sep->se_proto,
366 sep->se_rpcprog, n, pp->p_proto, ntohs(ir_sin.sin_port));
370 static void unregister_rpc(servtab_t *sep)
374 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) {
375 if (!pmap_unset(sep->se_rpcprog, n))
376 bb_error_msg("pmap_unset(%u, %u)", sep->se_rpcprog, n);
379 #endif /* CONFIG_FEATURE_INETD_RPC */
381 static void freeconfig(servtab_t *cp)
385 free(cp->se_hostaddr);
386 free(cp->se_service);
391 for (i = 0; i < MAXARGV; i++)
392 free(cp->se_argv[i]);
395 static int bump_nofile (void)
401 if (getrlimit (RLIMIT_NOFILE, &rl) < 0) {
402 bb_perror_msg("getrlimit");
405 rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK);
406 rl.rlim_cur = MIN(FD_SETSIZE, rl.rlim_cur + FD_CHUNK);
407 if (rl.rlim_cur <= rlim_ofile_cur) {
408 bb_error_msg("bump_nofile: cannot extend file limit, max = %d",
413 if (setrlimit(RLIMIT_NOFILE, &rl) < 0) {
414 bb_perror_msg("setrlimit");
418 rlim_ofile_cur = rl.rlim_cur;
422 static void setup(servtab_t *sep)
427 sep->se_fd = socket(sep->se_family, sep->se_socktype, 0);
428 if (sep->se_fd < 0) {
429 bb_perror_msg("%s/%s: socket", sep->se_service, sep->se_proto);
432 #define turnon(fd, opt) \
433 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof(on))
434 if (turnon(sep->se_fd, SO_REUSEADDR) < 0)
435 bb_perror_msg("setsockopt(SO_REUSEADDR)");
438 #ifdef CONFIG_FEATURE_INETD_RPC
439 if (isrpcservice(sep)) {
443 * for RPC services, attempt to use a reserved port
444 * if they are going to be running as root.
446 * Also, zero out the port for all RPC services; let bind()
449 sep->se_ctrladdr_in.sin_port = 0;
450 if (sep->se_user && (pwd = getpwnam(sep->se_user)) &&
451 pwd->pw_uid == 0 && uid == 0)
452 r = bindresvport(sep->se_fd, &sep->se_ctrladdr_in);
454 r = bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size);
456 socklen_t len = sep->se_ctrladdr_size;
457 int saveerrno = errno;
459 /* update se_ctrladdr_in.sin_port */
460 r = getsockname(sep->se_fd, &sep->se_ctrladdr, &len);
467 r = bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size);
469 bb_perror_msg("%s/%s (%d): bind",
470 sep->se_service, sep->se_proto, sep->se_ctrladdr.sa_family);
479 if (sep->se_socktype == SOCK_STREAM)
480 listen(sep->se_fd, global_queuelen);
482 FD_SET(sep->se_fd, &allsock);
484 if (sep->se_fd > maxsock) {
485 maxsock = sep->se_fd;
486 if ((rlim_t)maxsock > rlim_ofile_cur - FD_MARGIN)
491 static char *nextline(void)
496 if (fgets(line, sizeof(line), fd) == NULL)
498 cp = strchr(line, '\n');
504 static char *skip(char **cpp) /* int report; */
512 /* bb_error_msg("syntax error in inetd config file"); */
517 while (*cp == ' ' || *cp == '\t')
523 (void) ungetc(c, fconfig);
524 if (c == ' ' || c == '\t')
525 if ((cp = nextline()))
532 while (*cp && *cp != ' ' && *cp != '\t')
536 /* if ((*cpp = cp) == NULL) */
543 static servtab_t *new_servtab(void)
545 return xmalloc(sizeof(servtab_t));
548 static servtab_t *dupconfig(servtab_t *sep)
553 newtab = new_servtab();
554 memset(newtab, 0, sizeof(servtab_t));
555 newtab->se_service = xstrdup(sep->se_service);
556 newtab->se_socktype = sep->se_socktype;
557 newtab->se_family = sep->se_family;
558 newtab->se_proto = xstrdup(sep->se_proto);
559 #ifdef CONFIG_FEATURE_INETD_RPC
560 newtab->se_rpcprog = sep->se_rpcprog;
561 newtab->se_rpcversl = sep->se_rpcversl;
562 newtab->se_rpcversh = sep->se_rpcversh;
564 newtab->se_wait = sep->se_wait;
565 newtab->se_user = xstrdup(sep->se_user);
566 newtab->se_group = xstrdup(sep->se_group);
567 #ifdef INETD_FEATURE_ENABLED
568 newtab->se_bi = sep->se_bi;
570 newtab->se_server = xstrdup(sep->se_server);
572 for (argc = 0; argc <= MAXARGV; argc++)
573 newtab->se_argv[argc] = xstrdup(sep->se_argv[argc]);
574 newtab->se_max = sep->se_max;
579 static servtab_t *getconfigent(void)
590 /* memset(sep, 0, sizeof *sep); */
592 /* freeconfig(sep); */
594 while ((cp = nextline()) && *cp == '#');
600 memset((char *) sep, 0, sizeof *sep);
607 /* Check for a host name. */
608 hostdelim = strrchr(arg, ':');
611 sep->se_hostaddr = xstrdup(arg);
614 * If the line is of the form `host:', then just change the
615 * default host for the following lines.
621 defhost = sep->se_hostaddr;
626 sep->se_hostaddr = xxstrdup(defhost);
628 sep->se_service = xxstrdup(arg);
631 if (strcmp(arg, "stream") == 0)
632 sep->se_socktype = SOCK_STREAM;
633 else if (strcmp(arg, "dgram") == 0)
634 sep->se_socktype = SOCK_DGRAM;
635 else if (strcmp(arg, "rdm") == 0)
636 sep->se_socktype = SOCK_RDM;
637 else if (strcmp(arg, "seqpacket") == 0)
638 sep->se_socktype = SOCK_SEQPACKET;
639 else if (strcmp(arg, "raw") == 0)
640 sep->se_socktype = SOCK_RAW;
642 sep->se_socktype = -1;
644 sep->se_proto = xxstrdup(skip(&cp));
646 if (strcmp(sep->se_proto, "unix") == 0) {
647 sep->se_family = AF_UNIX;
649 sep->se_family = AF_INET;
650 if (sep->se_proto[strlen(sep->se_proto) - 1] == '6')
651 #ifdef CONFIG_FEATURE_IPV6
652 sep->se_family = AF_INET6;
654 bb_error_msg("%s: IPV6 not supported", sep->se_proto);
656 if (strncmp(sep->se_proto, "rpc/", 4) == 0) {
657 #ifdef CONFIG_FEATURE_INETD_RPC
661 p = strchr(sep->se_service, '/');
663 bb_error_msg("%s: no rpc version", sep->se_service);
667 l = strtol(p, &ccp, 0);
668 if (ccp == p || l < 0 || l > INT_MAX) {
670 bb_error_msg("%s/%s: bad rpc version", sep->se_service, p);
673 sep->se_rpcversl = sep->se_rpcversh = l;
676 l = strtol(p, &ccp, 0);
677 if (ccp == p || l < 0 || l > INT_MAX || l < sep->se_rpcversl || *ccp)
679 sep->se_rpcversh = l;
680 } else if (*ccp != '\0')
683 bb_error_msg("%s: rpc services not supported", sep->se_service);
692 char *s = strchr(arg, '.');
695 sep->se_max = atoi(s);
697 sep->se_max = toomany;
699 sep->se_wait = strcmp(arg, "wait") == 0;
700 /* if ((arg = skip(&cp, 1)) == NULL) */
702 sep->se_user = xxstrdup(skip(&cp));
703 arg = strchr(sep->se_user, '.');
705 arg = strchr(sep->se_user, ':');
708 sep->se_group = xstrdup(arg);
710 /* if ((arg = skip(&cp, 1)) == NULL) */
713 sep->se_server = xxstrdup(skip(&cp));
714 if (strcmp(sep->se_server, "internal") == 0) {
715 #ifdef INETD_FEATURE_ENABLED
716 const struct builtin *bi;
718 for (bi = builtins; bi->bi_service; bi++)
719 if (bi->bi_socktype == sep->se_socktype &&
720 strcmp(bi->bi_service, sep->se_service) == 0)
722 if (bi->bi_service == 0) {
723 bb_error_msg("internal service %s unknown", sep->se_service);
727 sep->se_wait = bi->bi_wait;
729 bb_perror_msg("internal service %s unknown", sep->se_service);
733 #ifdef INETD_FEATURE_ENABLED
738 for (arg = skip(&cp); cp; arg = skip(&cp)) {
740 sep->se_argv[argc++] = xxstrdup(arg);
742 while (argc <= MAXARGV)
743 sep->se_argv[argc++] = NULL;
746 * Now that we've processed the entire line, check if the hostname
747 * specifier was a comma separated list of hostnames. If so
748 * we'll make new entries for each address.
750 while ((hostdelim = strrchr(sep->se_hostaddr, ',')) != NULL) {
751 nsep = dupconfig(sep);
754 * NULL terminate the hostname field of the existing entry,
755 * and make a dup for the new entry.
758 nsep->se_hostaddr = xstrdup(hostdelim);
760 nsep->se_next = sep->se_next;
765 while (nsep != NULL) {
766 nsep->se_checked = 1;
767 if (nsep->se_family == AF_INET) {
768 if (!strcmp(nsep->se_hostaddr, "*"))
769 nsep->se_ctrladdr_in.sin_addr.s_addr = INADDR_ANY;
770 else if (!inet_aton(nsep->se_hostaddr, &nsep->se_ctrladdr_in.sin_addr)) {
773 hp = gethostbyname(nsep->se_hostaddr);
775 bb_error_msg("%s: unknown host", nsep->se_hostaddr);
776 nsep->se_checked = 0;
778 } else if (hp->h_addrtype != AF_INET) {
779 bb_error_msg("%s: address isn't an Internet "
780 "address", nsep->se_hostaddr);
781 nsep->se_checked = 0;
786 memmove(&nsep->se_ctrladdr_in.sin_addr,
787 hp->h_addr_list[0], sizeof(struct in_addr));
788 while (hp->h_addr_list[i] != NULL) {
789 psep = dupconfig(nsep);
790 psep->se_hostaddr = xxstrdup(nsep->se_hostaddr);
791 psep->se_checked = 1;
792 memmove(&psep->se_ctrladdr_in.sin_addr,
793 hp->h_addr_list[i], sizeof(struct in_addr));
794 psep->se_ctrladdr_size = sizeof(psep->se_ctrladdr_in);
796 /* Prepend to list, don't want to look up */
797 /* its hostname again. */
804 /* XXX BUG?: is this skip: label supposed to remain? */
806 nsep = nsep->se_next;
810 * Finally, free any entries which failed the gethostbyname
815 while (nsep != NULL) {
818 if (nsep->se_checked == 0) {
824 nsep = nsep->se_next;
825 psep->se_next = nsep;
829 nsep->se_checked = 0;
831 nsep = nsep->se_next;
838 #define Block_Using_Signals(m) do { \
840 sigaddset(&m, SIGCHLD); \
841 sigaddset(&m, SIGHUP); \
842 sigaddset(&m, SIGALRM); \
843 sigprocmask(SIG_BLOCK, &m, NULL); \
846 static servtab_t *enter(servtab_t *cp)
854 #ifdef CONFIG_FEATURE_INETD_RPC
855 sep->se_rpcprog = -1;
857 Block_Using_Signals(omask);
858 sep->se_next = servtab;
860 sigprocmask(SIG_UNBLOCK, &omask, NULL);
864 static int matchconf(servtab_t *old, servtab_t *new)
866 if (strcmp(old->se_service, new->se_service) != 0)
869 if (strcmp(old->se_hostaddr, new->se_hostaddr) != 0)
872 if (strcmp(old->se_proto, new->se_proto) != 0)
876 * If the new servtab is bound to a specific address, check that the
877 * old servtab is bound to the same entry. If the new service is not
878 * bound to a specific address then the check of se_hostaddr above
882 if (old->se_family == AF_INET && new->se_family == AF_INET &&
883 memcmp(&old->se_ctrladdr_in.sin_addr,
884 &new->se_ctrladdr_in.sin_addr,
885 sizeof(new->se_ctrladdr_in.sin_addr)) != 0)
888 #ifdef CONFIG_FEATURE_IPV6
889 if (old->se_family == AF_INET6 && new->se_family == AF_INET6 &&
890 memcmp(&old->se_ctrladdr_in6.sin6_addr,
891 &new->se_ctrladdr_in6.sin6_addr,
892 sizeof(new->se_ctrladdr_in6.sin6_addr)) != 0)
898 static void config(int sig ATTRIBUTE_UNUSED)
900 servtab_t *sep, *cp, **sepp;
906 bb_perror_msg("%s", CONFIG);
909 for (sep = servtab; sep; sep = sep->se_next)
913 for (sep = servtab; sep; sep = sep->se_next)
914 if (matchconf(sep, cp))
920 #define SWAP(type, a, b) do {type c=(type)a; a=(type)b; b=(type)c;} while (0)
922 Block_Using_Signals(omask);
924 * sep->se_wait may be holding the pid of a daemon
925 * that we're waiting for. If so, don't overwrite
926 * it unless the config file explicitly says don't
930 #ifdef INETD_FEATURE_ENABLED
933 (sep->se_wait == 1 || cp->se_wait == 0))
934 sep->se_wait = cp->se_wait;
935 SWAP(int, cp->se_max, sep->se_max);
936 SWAP(char *, sep->se_user, cp->se_user);
937 SWAP(char *, sep->se_group, cp->se_group);
938 SWAP(char *, sep->se_server, cp->se_server);
939 for (i = 0; i < MAXARGV; i++)
940 SWAP(char *, sep->se_argv[i], cp->se_argv[i]);
943 #ifdef CONFIG_FEATURE_INETD_RPC
944 if (isrpcservice(sep))
946 sep->se_rpcversl = cp->se_rpcversl;
947 sep->se_rpcversh = cp->se_rpcversh;
949 sigprocmask(SIG_UNBLOCK, &omask, NULL);
956 switch (sep->se_family) {
958 if (sep->se_fd != -1)
960 (void) unlink(sep->se_service);
961 n = strlen(sep->se_service);
962 if (n > sizeof sep->se_ctrladdr_un.sun_path - 1)
963 n = sizeof sep->se_ctrladdr_un.sun_path - 1;
964 safe_strncpy(sep->se_ctrladdr_un.sun_path, sep->se_service, n + 1);
965 sep->se_ctrladdr_un.sun_family = AF_UNIX;
966 sep->se_ctrladdr_size = n + sizeof sep->se_ctrladdr_un.sun_family;
970 sep->se_ctrladdr_in.sin_family = AF_INET;
971 /* se_ctrladdr_in was set in getconfigent */
972 sep->se_ctrladdr_size = sizeof sep->se_ctrladdr_in;
974 #ifdef CONFIG_FEATURE_INETD_RPC
975 if (isrpcservice(sep)) {
978 sep->se_rpcprog = atoi(sep->se_service);
979 if (sep->se_rpcprog == 0) {
980 rp = getrpcbyname(sep->se_service);
982 bb_error_msg("%s: unknown rpc service", sep->se_service);
985 sep->se_rpcprog = rp->r_number;
987 if (sep->se_fd == -1)
989 if (sep->se_fd != -1)
994 u_short port = htons(atoi(sep->se_service));
997 /*XXX*/ strncpy(protoname, sep->se_proto, sizeof(protoname));
998 if (isdigit(protoname[strlen(protoname) - 1]))
999 protoname[strlen(protoname) - 1] = '\0';
1000 sp = getservbyname(sep->se_service, protoname);
1002 bb_error_msg("%s/%s: unknown service",
1003 sep->se_service, sep->se_proto);
1008 if (port != sep->se_ctrladdr_in.sin_port) {
1009 sep->se_ctrladdr_in.sin_port = port;
1010 if (sep->se_fd != -1) {
1011 FD_CLR(sep->se_fd, &allsock);
1013 (void) close(sep->se_fd);
1017 if (sep->se_fd == -1)
1021 #ifdef CONFIG_FEATURE_IPV6
1023 sep->se_ctrladdr_in6.sin6_family = AF_INET6;
1024 /* se_ctrladdr_in was set in getconfigent */
1025 sep->se_ctrladdr_size = sizeof sep->se_ctrladdr_in6;
1027 #ifdef CONFIG_FEATURE_INETD_RPC
1028 if (isrpcservice(sep)) {
1031 sep->se_rpcprog = atoi(sep->se_service);
1032 if (sep->se_rpcprog == 0) {
1033 rp = getrpcbyname(sep->se_service);
1035 bb_error_msg("%s: unknown rpc service", sep->se_service);
1038 sep->se_rpcprog = rp->r_number;
1040 if (sep->se_fd == -1)
1042 if (sep->se_fd != -1)
1047 u_short port = htons(atoi(sep->se_service));
1050 /*XXX*/ strncpy(protoname, sep->se_proto, sizeof(protoname));
1051 if (isdigit(protoname[strlen(protoname) - 1]))
1052 protoname[strlen(protoname) - 1] = '\0';
1053 sp = getservbyname(sep->se_service, protoname);
1055 bb_error_msg("%s/%s: unknown service",
1056 sep->se_service, sep->se_proto);
1061 if (port != sep->se_ctrladdr_in6.sin6_port) {
1062 sep->se_ctrladdr_in6.sin6_port = port;
1063 if (sep->se_fd != -1) {
1064 FD_CLR(sep->se_fd, &allsock);
1066 (void) close(sep->se_fd);
1070 if (sep->se_fd == -1)
1074 #endif /* CONFIG_FEATURE_IPV6 */
1077 if (cp->se_next != NULL) {
1078 servtab_t *tmp = cp;
1084 cp = getconfigent();
1089 * Purge anything not looked at above.
1091 Block_Using_Signals(omask);
1093 while ((sep = *sepp)) {
1094 if (sep->se_checked) {
1095 sepp = &sep->se_next;
1098 *sepp = sep->se_next;
1099 if (sep->se_fd != -1) {
1100 FD_CLR(sep->se_fd, &allsock);
1102 (void) close(sep->se_fd);
1104 #ifdef CONFIG_FEATURE_INETD_RPC
1105 if (isrpcservice(sep))
1106 unregister_rpc(sep);
1108 if (sep->se_family == AF_UNIX)
1109 (void) unlink(sep->se_service);
1113 sigprocmask(SIG_UNBLOCK, &omask, NULL);
1117 static void reapchild(int sig ATTRIBUTE_UNUSED)
1120 int save_errno = errno, status;
1124 pid = wait3(&status, WNOHANG, NULL);
1127 for (sep = servtab; sep; sep = sep->se_next)
1128 if (sep->se_wait == pid) {
1129 if (WIFEXITED(status) && WEXITSTATUS(status))
1130 bb_error_msg("%s: exit status 0x%x",
1131 sep->se_server, WEXITSTATUS(status));
1132 else if (WIFSIGNALED(status))
1133 bb_error_msg("%s: exit signal 0x%x",
1134 sep->se_server, WTERMSIG(status));
1136 FD_SET(sep->se_fd, &allsock);
1143 static void retry(int sig ATTRIBUTE_UNUSED)
1148 for (sep = servtab; sep; sep = sep->se_next) {
1149 if (sep->se_fd == -1) {
1150 switch (sep->se_family) {
1153 #ifdef CONFIG_FEATURE_IPV6
1157 #ifdef CONFIG_FEATURE_INETD_RPC
1158 if (sep->se_fd != -1 && isrpcservice(sep))
1167 static void goaway(int sig ATTRIBUTE_UNUSED)
1171 /* XXX signal race walking sep list */
1172 for (sep = servtab; sep; sep = sep->se_next) {
1173 if (sep->se_fd == -1)
1176 switch (sep->se_family) {
1178 (void) unlink(sep->se_service);
1181 #ifdef CONFIG_FEATURE_IPV6
1184 #ifdef CONFIG_FEATURE_INETD_RPC
1185 if (sep->se_wait == 1 && isrpcservice(sep))
1186 unregister_rpc(sep); /* XXX signal race */
1190 (void) close(sep->se_fd);
1192 (void) unlink(_PATH_INETDPID);
1197 #ifdef INETD_SETPROCTITLE
1199 static char *LastArg;
1202 inetd_setproctitle(char *a, int s)
1206 struct sockaddr_in prt_sin;
1210 size = sizeof(prt_sin);
1211 (void) snprintf(buf, sizeof buf, "-%s", a);
1212 if (getpeername(s, (struct sockaddr *) &prt_sin, &size) == 0) {
1213 char *sa = inet_ntoa(prt_sin.sin_addr);
1215 buf[sizeof(buf) - 1 - strlen(sa) - 3] = '\0';
1220 strncpy(cp, buf, LastArg - cp);
1222 while (cp < LastArg)
1229 inetd_main(int argc, char *argv[])
1233 struct group *grp = NULL;
1235 struct sigaction sa, sapipe;
1240 sigset_t omask, wait_mask;
1242 #ifdef INETD_SETPROCTITLE
1243 extern char **environ;
1244 char **envp = environ;
1247 if (envp == 0 || *envp == 0)
1251 LastArg = envp[-1] + strlen(envp[-1]);
1254 openlog(bb_applet_name, LOG_PID | LOG_NOWAIT, LOG_DAEMON);
1256 opt = bb_getopt_ulflags(argc, argv, "R:f", &stoomany);
1260 toomany = strtoul(stoomany, &e, 0);
1261 if (!(toomany >= 0 && *e == '\0')) {
1263 bb_perror_msg("-R %s: bad value for service invocation rate", stoomany);
1275 bb_error_msg_and_die("non-root must specify a config file");
1279 /* reexec for vfork() do continue parent */
1280 vfork_daemon_rexec(0, 0, argc, argv, "-f");
1287 logmode = LOGMODE_SYSLOG;
1290 gid_t gid = getgid();
1292 /* If run by hand, ensure groups vector gets trashed */
1297 FILE *fp = fopen(_PATH_INETDPID, "w");
1300 fprintf(fp, "%u\n", getpid());
1305 if (getrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) {
1306 bb_perror_msg("getrlimit");
1308 rlim_ofile_cur = rlim_ofile.rlim_cur;
1309 if (rlim_ofile_cur == RLIM_INFINITY) /* ! */
1310 rlim_ofile_cur = OPEN_MAX;
1313 memset((char *) &sa, 0, sizeof(sa));
1314 sigemptyset(&sa.sa_mask);
1315 sigaddset(&sa.sa_mask, SIGALRM);
1316 sigaddset(&sa.sa_mask, SIGCHLD);
1317 sigaddset(&sa.sa_mask, SIGHUP);
1318 sa.sa_handler = retry;
1319 sigaction(SIGALRM, &sa, NULL);
1322 sa.sa_handler = config;
1323 sigaction(SIGHUP, &sa, NULL);
1324 sa.sa_handler = reapchild;
1325 sigaction(SIGCHLD, &sa, NULL);
1326 sa.sa_handler = goaway;
1327 sigaction(SIGTERM, &sa, NULL);
1328 sa.sa_handler = goaway;
1329 sigaction(SIGINT, &sa, NULL);
1330 sa.sa_handler = SIG_IGN;
1331 sigaction(SIGPIPE, &sa, &sapipe);
1332 memset(&wait_mask, 0, sizeof(wait_mask));
1334 /* space for daemons to overwrite environment for ps */
1335 #define DUMMYSIZE 100
1336 char dummy[DUMMYSIZE];
1338 (void) memset(dummy, 'x', DUMMYSIZE - 1);
1339 dummy[DUMMYSIZE - 1] = '\0';
1341 (void) setenv("inetd_dummy", dummy, 1);
1349 Block_Using_Signals(omask);
1351 sigsuspend(&wait_mask);
1352 sigprocmask(SIG_UNBLOCK, &omask, NULL);
1356 n = select(maxsock + 1, &readable, NULL, NULL, NULL);
1358 if (n < 0 && errno != EINTR) {
1359 bb_perror_msg("select");
1365 for (sep = servtab; n && sep; sep = sep->se_next) {
1366 if (sep->se_fd == -1 || !FD_ISSET(sep->se_fd, &readable))
1370 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) {
1371 ctrl = accept(sep->se_fd, NULL, NULL);
1375 bb_perror_msg("accept (for %s)", sep->se_service);
1378 if (sep->se_family == AF_INET && sep->se_socktype == SOCK_STREAM) {
1379 struct sockaddr_in peer;
1380 socklen_t plen = sizeof(peer);
1382 if (getpeername(ctrl, (struct sockaddr *) &peer, &plen) < 0) {
1383 bb_error_msg("could not getpeername");
1387 if (ntohs(peer.sin_port) == 20) {
1388 /* XXX ftp bounce */
1396 Block_Using_Signals(omask);
1398 #ifdef INETD_FEATURE_ENABLED
1399 if (sep->se_bi == 0 || sep->se_bi->bi_fork)
1402 if (sep->se_count++ == 0)
1403 (void) gettimeofday(&sep->se_time, NULL);
1404 else if (toomany > 0 && sep->se_count >= sep->se_max) {
1407 (void) gettimeofday(&now, NULL);
1408 if (now.tv_sec - sep->se_time.tv_sec > CNT_INTVL) {
1412 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
1414 if (sep->se_family == AF_INET &&
1415 ntohs(sep->se_ctrladdr_in.sin_port) >= IPPORT_RESERVED) {
1417 * Cannot close it -- there are
1418 * thieves on the system.
1419 * Simply ignore the connection.
1424 bb_error_msg("%s/%s server failing (looping), service terminated",
1425 sep->se_service, sep->se_proto);
1426 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
1428 FD_CLR(sep->se_fd, &allsock);
1429 (void) close(sep->se_fd);
1433 sigprocmask(SIG_UNBLOCK, &omask, NULL);
1444 bb_perror_msg("fork");
1445 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
1447 sigprocmask(SIG_UNBLOCK, &omask, NULL);
1451 if (pid && sep->se_wait) {
1453 FD_CLR(sep->se_fd, &allsock);
1456 sigprocmask(SIG_UNBLOCK, &omask, NULL);
1458 #ifdef INETD_FEATURE_ENABLED
1460 (*sep->se_bi->bi_fn)(ctrl, sep);
1464 pwd = getpwnam(sep->se_user);
1466 bb_error_msg("getpwnam: %s: no such user", sep->se_user);
1470 bb_perror_msg("%s: setsid", sep->se_service);
1471 if (sep->se_group && (grp = getgrnam(sep->se_group)) == NULL) {
1472 bb_error_msg("getgrnam: %s: no such group", sep->se_group);
1476 /* a user running private inetd */
1477 if (uid != pwd->pw_uid)
1479 } else if (pwd->pw_uid) {
1481 pwd->pw_gid = grp->gr_gid;
1482 xsetgid((gid_t) pwd->pw_gid);
1483 initgroups(pwd->pw_name, pwd->pw_gid);
1484 xsetuid((uid_t) pwd->pw_uid);
1485 } else if (sep->se_group) {
1486 xsetgid(grp->gr_gid);
1487 setgroups(1, &grp->gr_gid);
1490 if (ctrl) close(ctrl);
1493 if (rlim_ofile.rlim_cur != rlim_ofile_cur)
1494 if (setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0)
1495 bb_perror_msg("setrlimit");
1497 for (tmpint = rlim_ofile_cur - 1; --tmpint > 2;)
1498 (void) close(tmpint);
1499 sigaction(SIGPIPE, &sapipe, NULL);
1500 execv(sep->se_server, sep->se_argv);
1501 bb_perror_msg("execv %s", sep->se_server);
1503 if (sep->se_socktype != SOCK_STREAM)
1504 recv(0, buf, sizeof(buf), 0);
1508 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
1510 } /* for (sep = servtab...) */
1515 * Internet services provided internally by inetd:
1517 #define BUFSIZE 4096
1519 #if defined(CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_ECHO) || \
1520 defined(CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN) || \
1521 defined(CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME)
1522 static int dg_badinput(struct sockaddr_in *dg_sin)
1524 if (ntohs(dg_sin->sin_port) < IPPORT_RESERVED)
1526 if (dg_sin->sin_addr.s_addr == htonl(INADDR_BROADCAST))
1528 /* XXX compare against broadcast addresses in SIOCGIFCONF list? */
1533 #ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
1534 /* Echo service -- echo data back */
1537 echo_stream(int s, servtab_t *sep)
1539 char buffer[BUFSIZE];
1542 inetd_setproctitle(sep->se_service, s);
1544 i = read(s, buffer, sizeof(buffer));
1546 /* FIXME: this isnt correct - safe_write()? */
1547 if (write(s, buffer, i) <= 0) break;
1552 /* Echo service -- echo data back */
1555 echo_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
1557 char buffer[BUFSIZE];
1560 /* struct sockaddr_storage ss; */
1564 i = recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size);
1567 if (dg_badinput((struct sockaddr_in *) &sa))
1569 (void) sendto(s, buffer, i, 0, &sa, sizeof(sa));
1571 #endif /* CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_ECHO */
1573 #ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
1574 /* Discard service -- ignore data */
1577 discard_stream(int s, servtab_t *sep)
1579 char buffer[BUFSIZE];
1581 inetd_setproctitle(sep->se_service, s);
1584 if (read(s, buffer, sizeof(buffer)) <= 0 && errno != EINTR)
1589 /* Discard service -- ignore data */
1592 discard_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
1594 char buffer[BUFSIZE];
1596 (void) read(s, buffer, sizeof(buffer));
1598 #endif /* CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD */
1601 #ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
1603 static char ring[128];
1604 static char *endring;
1613 for (i = 0; i <= 128; ++i)
1618 /* Character generator */
1621 chargen_stream(int s, servtab_t *sep)
1625 char text[LINESIZ + 2];
1627 inetd_setproctitle(sep->se_service, s);
1634 text[LINESIZ] = '\r';
1635 text[LINESIZ + 1] = '\n';
1640 memmove(text, rs, LINESIZ);
1642 memmove(text, rs, len);
1643 memmove(text + len, ring, LINESIZ - len);
1645 if (++rs == endring)
1647 if (write(s, text, sizeof(text)) != sizeof(text))
1653 /* Character generator */
1656 chargen_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
1658 /* struct sockaddr_storage ss; */
1662 char text[LINESIZ + 2];
1671 if (recvfrom(s, text, sizeof(text), 0, &sa, &size) < 0)
1673 if (dg_badinput((struct sockaddr_in *) &sa))
1676 if ((len = endring - rs) >= LINESIZ)
1677 memmove(text, rs, LINESIZ);
1679 memmove(text, rs, len);
1680 memmove(text + len, ring, LINESIZ - len);
1682 if (++rs == endring)
1684 text[LINESIZ] = '\r';
1685 text[LINESIZ + 1] = '\n';
1686 (void) sendto(s, text, sizeof(text), 0, &sa, sizeof(sa));
1688 #endif /* CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN */
1691 #ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_TIME
1693 * Return a machine readable date and time, in the form of the
1694 * number of seconds since midnight, Jan 1, 1900. Since gettimeofday
1695 * returns the number of seconds since midnight, Jan 1, 1970,
1696 * we must add 2208988800 seconds to this figure to make up for
1697 * some seventy years Bell Labs was asleep.
1700 static u_int machtime(void)
1704 if (gettimeofday(&tv, NULL) < 0) {
1705 fprintf(stderr, "Unable to get time of day\n");
1708 return htonl((u_int) tv.tv_sec + 2208988800UL);
1713 machtime_stream(int s, servtab_t *sep ATTRIBUTE_UNUSED)
1717 result = machtime();
1718 (void) write(s, (char *) &result, sizeof(result));
1723 machtime_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
1726 /* struct sockaddr_storage ss; */
1728 struct sockaddr_in *dg_sin;
1732 if (recvfrom(s, (char *) &result, sizeof(result), 0, &sa, &size) < 0)
1734 /* if (dg_badinput((struct sockaddr *)&ss)) */
1735 dg_sin = (struct sockaddr_in *) &sa;
1736 if (dg_sin->sin_addr.s_addr == htonl(INADDR_BROADCAST) ||
1737 ntohs(dg_sin->sin_port) < IPPORT_RESERVED / 2)
1739 result = machtime();
1740 (void) sendto(s, (char *) &result, sizeof(result), 0, &sa, sizeof(sa));
1742 #endif /* CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_TIME */
1745 #ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
1746 /* Return human-readable time of day */
1748 static void daytime_stream(int s, servtab_t *sep ATTRIBUTE_UNUSED)
1755 (void) sprintf(buffer, "%.24s\r\n", ctime(&t));
1756 (void) write(s, buffer, strlen(buffer));
1759 /* Return human-readable time of day */
1762 daytime_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
1766 /* struct sockaddr_storage ss; */
1773 if (recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size) < 0)
1775 if (dg_badinput((struct sockaddr_in *) &sa))
1777 (void) sprintf(buffer, "%.24s\r\n", ctime(&t));
1778 (void) sendto(s, buffer, strlen(buffer), 0, &sa, sizeof(sa));
1780 #endif /* CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME */