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
39 /* Inetd - Internet super-server
41 * This program invokes all internet services as needed.
42 * connection-oriented services are invoked each time a
43 * connection is made, by creating a process. This process
44 * is passed the connection as file descriptor 0 and is
45 * expected to do a getpeername to find out the source host
48 * Datagram oriented services are invoked when a datagram
49 * arrives; a process is created and passed a pending message
50 * on file descriptor 0. Datagram servers may either connect
51 * to their peer, freeing up the original socket for inetd
52 * to receive further messages on, or "take over the socket",
53 * processing all arriving datagrams and, eventually, timing
54 * out. The first type of server is said to be "multi-threaded";
55 * the second type of server "single-threaded".
57 * Inetd uses a configuration file which is read at startup
58 * and, possibly, at some later time in response to a hangup signal.
59 * The configuration file is "free format" with fields given in the
60 * order shown below. Continuation lines for an entry must begin with
61 * a space or tab. All fields must be present in each entry.
63 * service name must be in /etc/services
64 * socket type stream/dgram/raw/rdm/seqpacket
65 * protocol must be in /etc/protocols
66 * wait/nowait[.max] single-threaded/multi-threaded, max #
67 * user[.group] or user[:group] user/group to run daemon as
68 * server program full path name
69 * server program arguments maximum of MAXARGS (20)
72 * service name/version must be in /etc/rpc
73 * socket type stream/dgram/raw/rdm/seqpacket
74 * protocol must be in /etc/protocols
75 * wait/nowait[.max] single-threaded/multi-threaded
76 * user[.group] or user[:group] user to run daemon as
77 * server program full path name
78 * server program arguments maximum of MAXARGS (20)
80 * For non-RPC services, the "service name" can be of the form
81 * hostaddress:servicename, in which case the hostaddress is used
82 * as the host portion of the address to listen on. If hostaddress
83 * consists of a single `*' character, INADDR_ANY is used.
85 * A line can also consist of just
87 * where hostaddress is as in the preceding paragraph. Such a line must
88 * have no further fields; the specified hostaddress is remembered and
89 * used for all further lines that have no hostaddress specified,
90 * until the next such line (or EOF). (This is why * is provided to
91 * allow explicit specification of INADDR_ANY.) A line
93 * is implicitly in effect at the beginning of the file.
95 * The hostaddress specifier may (and often will) contain dots;
96 * the service name must not.
98 * For RPC services, host-address specifiers are accepted and will
99 * work to some extent; however, because of limitations in the
100 * portmapper interface, it will not work to try to give more than
101 * one line for any given RPC service, even if the host-address
102 * specifiers are different.
104 * Comment lines are indicated by a `#' in column 1.
107 /* inetd rules for passing file descriptors to children
108 * (http://www.freebsd.org/cgi/man.cgi?query=inetd):
110 * The wait/nowait entry specifies whether the server that is invoked by
111 * inetd will take over the socket associated with the service access point,
112 * and thus whether inetd should wait for the server to exit before listen-
113 * ing for new service requests. Datagram servers must use "wait", as
114 * they are always invoked with the original datagram socket bound to the
115 * specified service address. These servers must read at least one datagram
116 * from the socket before exiting. If a datagram server connects to its
117 * peer, freeing the socket so inetd can receive further messages on the
118 * socket, it is said to be a "multi-threaded" server; it should read one
119 * datagram from the socket and create a new socket connected to the peer.
120 * It should fork, and the parent should then exit to allow inetd to check
121 * for new service requests to spawn new servers. Datagram servers which
122 * process all incoming datagrams on a socket and eventually time out are
123 * said to be "single-threaded". The comsat(8), (biff(1)) and talkd(8)
124 * utilities are both examples of the latter type of datagram server. The
125 * tftpd(8) utility is an example of a multi-threaded datagram server.
127 * Servers using stream sockets generally are multi-threaded and use the
128 * "nowait" entry. Connection requests for these services are accepted by
129 * inetd, and the server is given only the newly-accepted socket connected
130 * to a client of the service. Most stream-based services operate in this
131 * manner. Stream-based servers that use "wait" are started with the lis-
132 * tening service socket, and must accept at least one connection request
133 * before exiting. Such a server would normally accept and process incoming
134 * connection requests until a timeout.
137 /* Here's the scoop concerning the user[.:]group feature:
139 * 1) set-group-option off.
141 * a) user = root: NO setuid() or setgid() is done
143 * b) other: setgid(primary group as found in passwd)
144 * initgroups(name, primary group)
147 * 2) set-group-option on.
149 * a) user = root: setgid(specified group)
153 * b) other: setgid(specified group)
154 * initgroups(name, specified group)
162 //#define ENABLE_FEATURE_INETD_RPC 1
163 //#define ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO 1
164 //#define ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD 1
165 //#define ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME 1
166 //#define ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME 1
167 //#define ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN 1
168 //#define ENABLE_FEATURE_IPV6 1
170 #if ENABLE_FEATURE_INETD_RPC
172 #include <rpc/pmap_clnt.h>
175 extern char **environ;
178 #define _PATH_INETDPID "/var/run/inetd.pid"
180 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */
181 #define RETRYTIME (60*10) /* retry after bind or server fail */
183 #ifndef RLIMIT_NOFILE
184 #define RLIMIT_NOFILE RLIMIT_OFILE
191 /* Reserve some descriptors, 3 stdio + at least: 1 log, 1 conf. file */
194 /* Check unsupporting builtin */
195 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO || \
196 ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD || \
197 ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME || \
198 ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME || \
199 ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
200 # define INETD_FEATURE_ENABLED
203 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO || \
204 ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD || \
205 ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
206 # define INETD_SETPROCTITLE
209 typedef int8_t socktype_t;
210 typedef int8_t family_t;
211 struct BUG_too_small {
212 char BUG_socktype_t_too_small[(0
217 | SOCK_RAW) <= 127 ? 1 : -1];
218 char BUG_family_t_too_small[(0
221 | AF_UNIX) <= 127 ? 1 : -1];
224 typedef struct servtab_t {
225 /* The most frequently referenced one: */
226 int se_fd; /* open descriptor */
227 /* NB: 'biggest fields last' saves on code size (~250 bytes) */
228 char *se_hostaddr; /* host address to listen on */
229 char *se_service; /* name of service */
230 char *se_proto; /* protocol used */
231 #if ENABLE_FEATURE_INETD_RPC
232 int se_rpcprog; /* rpc program number */
233 int se_rpcversl; /* rpc program lowest version */
234 int se_rpcversh; /* rpc program highest version */
235 #define isrpcservice(sep) ((sep)->se_rpcversl != 0)
237 #define isrpcservice(sep) 0
239 pid_t se_wait; /* single threaded server */
240 socktype_t se_socktype; /* type of socket to use */
241 family_t se_family; /* address family */
242 smallint se_checked; /* looked at during merge */
243 char *se_user; /* user name to run as */
244 char *se_group; /* group name to run as */
245 #ifdef INETD_FEATURE_ENABLED
246 const struct builtin *se_bi; /* if built-in, description */
248 int se_ctrladdr_size;
249 int se_max; /* max # of instances of this service */
250 int se_count; /* number started since se_time */
251 struct servtab_t *se_next;
252 struct timeval se_time; /* start of se_count */
253 char *se_server; /* server program */
255 char *se_argv[MAXARGV + 1]; /* program arguments */
257 struct sockaddr se_un_ctrladdr;
258 struct sockaddr_in se_un_ctrladdr_in;
259 #if ENABLE_FEATURE_IPV6
260 struct sockaddr_in6 se_un_ctrladdr_in6;
262 struct sockaddr_un se_un_ctrladdr_un;
263 } se_un; /* bound address */
264 #define se_ctrladdr se_un.se_un_ctrladdr
265 #define se_ctrladdr_in se_un.se_un_ctrladdr_in
266 #define se_ctrladdr_in6 se_un.se_un_ctrladdr_in6
267 #define se_ctrladdr_un se_un.se_un_ctrladdr_un
270 #ifdef INETD_FEATURE_ENABLED
272 const char *bi_service; /* internally provided service name */
273 socktype_t bi_socktype; /* type of socket supported */
274 uint8_t bi_fork; /* 1 if should fork before call */
275 // Commented since it is always 0
276 // uint8_t bi_wait; /* 1 if should wait for child */
277 void (*bi_fn) (int, servtab_t *);
280 /* Echo received data */
281 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
282 static void echo_stream(int, servtab_t *);
283 static void echo_dg(int, servtab_t *);
285 /* Internet /dev/null */
286 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
287 static void discard_stream(int, servtab_t *);
288 static void discard_dg(int, servtab_t *);
290 /* Return 32 bit time since 1900 */
291 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME
292 static void machtime_stream(int, servtab_t *);
293 static void machtime_dg(int, servtab_t *);
295 /* Return human-readable time */
296 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
297 static void daytime_stream(int, servtab_t *);
298 static void daytime_dg(int, servtab_t *);
300 /* Familiar character generator */
301 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
302 static void chargen_stream(int, servtab_t *);
303 static void chargen_dg(int, servtab_t *);
306 static const struct builtin builtins[] = {
307 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
308 /* Echo received data */
309 {"echo", SOCK_STREAM, 1, echo_stream,},
310 {"echo", SOCK_DGRAM, 0, echo_dg,},
312 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
313 /* Internet /dev/null */
314 {"discard", SOCK_STREAM, 1, discard_stream,},
315 {"discard", SOCK_DGRAM, 0, discard_dg,},
317 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME
318 /* Return 32 bit time since 1900 */
319 {"time", SOCK_STREAM, 0, machtime_stream,},
320 {"time", SOCK_DGRAM, 0, machtime_dg,},
322 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
323 /* Return human-readable time */
324 {"daytime", SOCK_STREAM, 0, daytime_stream,},
325 {"daytime", SOCK_DGRAM, 0, daytime_dg,},
327 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
328 /* Familiar character generator */
329 {"chargen", SOCK_STREAM, 1, chargen_stream,},
330 {"chargen", SOCK_DGRAM, 0, chargen_dg,},
332 { /* zero filled */ }
334 #endif /* INETD_FEATURE_ENABLED */
337 rlim_t rlim_ofile_cur;
338 struct rlimit rlim_ofile;
347 const char *config_filename;
350 #ifdef INETD_SETPROCTITLE
354 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
360 /* Used only in nextline() */
361 char line[80]; /* at least 80, see LINE_SIZE */
363 #define G (*(struct globals*)&bb_common_bufsiz1)
364 enum { LINE_SIZE = COMMON_BUFSIZE - offsetof(struct globals, line) };
365 struct BUG_G_too_big {
366 char BUG_G_too_big[sizeof(G) <= COMMON_BUFSIZE ? 1 : -1];
368 #define rlim_ofile_cur (G.rlim_ofile_cur )
369 #define rlim_ofile (G.rlim_ofile )
370 #define servtab (G.servtab )
371 #define global_queuelen (G.global_queuelen)
372 #define nsock (G.nsock )
373 #define maxsock (G.maxsock )
374 #define toomany (G.toomany )
375 #define timingout (G.timingout )
378 #define config_filename (G.config_filename)
379 #define fconfig (G.fconfig )
380 #define defhost (G.defhost )
381 #define Argv (G.Argv )
382 #define LastArg (G.LastArg )
383 #define endring (G.endring )
384 #define ringpos (G.ringpos )
385 #define ring (G.ring )
386 #define allsock (G.allsock )
387 #define line (G.line )
388 #define INIT_G() do { \
389 rlim_ofile_cur = OPEN_MAX; \
390 global_queuelen = 128; \
391 config_filename = "/etc/inetd.conf"; \
394 /* xstrdup(NULL) returns NULL, but this one
395 * will return newly-allocated "" if called with NULL arg
396 * TODO: audit whether this makes any real difference
398 static char *xxstrdup(char *cp)
400 return xstrdup(cp ? cp : "");
403 static int setconfig(void)
406 defhost = xstrdup("*");
407 if (fconfig != NULL) {
408 fseek(fconfig, 0L, SEEK_SET);
411 fconfig = fopen(config_filename, "r");
412 return (fconfig != NULL);
415 static void endconfig(void)
418 (void) fclose(fconfig);
425 #if ENABLE_FEATURE_INETD_RPC
426 static void register_rpc(servtab_t *sep)
429 struct sockaddr_in ir_sin;
433 if ((pp = getprotobyname(sep->se_proto + 4)) == NULL) {
434 bb_perror_msg("%s: getproto", sep->se_proto);
437 size = sizeof ir_sin;
438 if (getsockname(sep->se_fd, (struct sockaddr *) &ir_sin, &size) < 0) {
439 bb_perror_msg("%s/%s: getsockname",
440 sep->se_service, sep->se_proto);
444 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) {
445 (void) pmap_unset(sep->se_rpcprog, n);
446 if (!pmap_set(sep->se_rpcprog, n, pp->p_proto, ntohs(ir_sin.sin_port)))
447 bb_perror_msg("%s %s: pmap_set: %u %u %u %u",
448 sep->se_service, sep->se_proto,
449 sep->se_rpcprog, n, pp->p_proto, ntohs(ir_sin.sin_port));
453 static void unregister_rpc(servtab_t *sep)
457 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) {
458 if (!pmap_unset(sep->se_rpcprog, n))
459 bb_error_msg("pmap_unset(%u, %u)", sep->se_rpcprog, n);
462 #endif /* FEATURE_INETD_RPC */
464 static void freeconfig(servtab_t *cp)
468 free(cp->se_hostaddr);
469 free(cp->se_service);
474 for (i = 0; i < MAXARGV; i++)
475 free(cp->se_argv[i]);
478 static int bump_nofile(void)
484 if (getrlimit(RLIMIT_NOFILE, &rl) < 0) {
485 bb_perror_msg("getrlimit");
488 rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK);
489 rl.rlim_cur = MIN(FD_SETSIZE, rl.rlim_cur + FD_CHUNK);
490 if (rl.rlim_cur <= rlim_ofile_cur) {
491 bb_error_msg("bump_nofile: cannot extend file limit, max = %d",
496 if (setrlimit(RLIMIT_NOFILE, &rl) < 0) {
497 bb_perror_msg("setrlimit");
501 rlim_ofile_cur = rl.rlim_cur;
505 static void setup(servtab_t *sep)
509 sep->se_fd = socket(sep->se_family, sep->se_socktype, 0);
510 if (sep->se_fd < 0) {
511 bb_perror_msg("%s/%s: socket", sep->se_service, sep->se_proto);
514 setsockopt_reuseaddr(sep->se_fd);
516 #if ENABLE_FEATURE_INETD_RPC
517 if (isrpcservice(sep)) {
521 * for RPC services, attempt to use a reserved port
522 * if they are going to be running as root.
524 * Also, zero out the port for all RPC services; let bind()
527 sep->se_ctrladdr_in.sin_port = 0;
528 if (sep->se_user && (pwd = getpwnam(sep->se_user)) &&
529 pwd->pw_uid == 0 && uid == 0)
530 r = bindresvport(sep->se_fd, &sep->se_ctrladdr_in);
532 r = bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size);
534 socklen_t len = sep->se_ctrladdr_size;
535 int saveerrno = errno;
537 /* update se_ctrladdr_in.sin_port */
538 r = getsockname(sep->se_fd, &sep->se_ctrladdr, &len);
545 r = bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size);
547 bb_perror_msg("%s/%s (%d): bind",
548 sep->se_service, sep->se_proto, sep->se_ctrladdr.sa_family);
557 if (sep->se_socktype == SOCK_STREAM)
558 listen(sep->se_fd, global_queuelen);
560 FD_SET(sep->se_fd, &allsock);
562 if (sep->se_fd > maxsock) {
563 maxsock = sep->se_fd;
564 if ((rlim_t)maxsock > rlim_ofile_cur - FD_MARGIN)
569 static char *nextline(void)
574 if (fgets(line, LINE_SIZE, fd) == NULL)
576 cp = strchr(line, '\n');
582 static char *skip(char **cpp) /* int report; */
590 /* bb_error_msg("syntax error in inetd config file"); */
595 while (*cp == ' ' || *cp == '\t')
602 if (c == ' ' || c == '\t') {
612 while (*cp && *cp != ' ' && *cp != '\t')
616 /* if ((*cpp = cp) == NULL) */
623 static servtab_t *new_servtab(void)
625 return xmalloc(sizeof(servtab_t));
628 static servtab_t *dupconfig(servtab_t *sep)
633 newtab = new_servtab();
634 memset(newtab, 0, sizeof(servtab_t));
635 newtab->se_service = xstrdup(sep->se_service);
636 newtab->se_socktype = sep->se_socktype;
637 newtab->se_family = sep->se_family;
638 newtab->se_proto = xstrdup(sep->se_proto);
639 #if ENABLE_FEATURE_INETD_RPC
640 newtab->se_rpcprog = sep->se_rpcprog;
641 newtab->se_rpcversl = sep->se_rpcversl;
642 newtab->se_rpcversh = sep->se_rpcversh;
644 newtab->se_wait = sep->se_wait;
645 newtab->se_user = xstrdup(sep->se_user);
646 newtab->se_group = xstrdup(sep->se_group);
647 #ifdef INETD_FEATURE_ENABLED
648 newtab->se_bi = sep->se_bi;
650 newtab->se_server = xstrdup(sep->se_server);
652 for (argc = 0; argc <= MAXARGV; argc++)
653 newtab->se_argv[argc] = xstrdup(sep->se_argv[argc]);
654 newtab->se_max = sep->se_max;
659 static servtab_t *getconfigent(void)
670 /* memset(sep, 0, sizeof *sep); */
672 /* freeconfig(sep); */
674 while ((cp = nextline()) && *cp == '#') /* skip comment line */;
680 memset((char *) sep, 0, sizeof *sep);
687 /* Check for a host name. */
688 hostdelim = strrchr(arg, ':');
691 sep->se_hostaddr = xstrdup(arg);
694 * If the line is of the form `host:', then just change the
695 * default host for the following lines.
701 defhost = sep->se_hostaddr;
706 sep->se_hostaddr = xxstrdup(defhost);
708 sep->se_service = xxstrdup(arg);
711 if (strcmp(arg, "stream") == 0)
712 sep->se_socktype = SOCK_STREAM;
713 else if (strcmp(arg, "dgram") == 0)
714 sep->se_socktype = SOCK_DGRAM;
715 else if (strcmp(arg, "rdm") == 0)
716 sep->se_socktype = SOCK_RDM;
717 else if (strcmp(arg, "seqpacket") == 0)
718 sep->se_socktype = SOCK_SEQPACKET;
719 else if (strcmp(arg, "raw") == 0)
720 sep->se_socktype = SOCK_RAW;
722 sep->se_socktype = -1;
724 sep->se_proto = xxstrdup(skip(&cp));
726 if (strcmp(sep->se_proto, "unix") == 0) {
727 sep->se_family = AF_UNIX;
729 sep->se_family = AF_INET;
730 if (sep->se_proto[strlen(sep->se_proto) - 1] == '6')
731 #if ENABLE_FEATURE_IPV6
732 sep->se_family = AF_INET6;
734 bb_error_msg("%s: IPV6 not supported", sep->se_proto);
736 if (strncmp(sep->se_proto, "rpc/", 4) == 0) {
737 #if ENABLE_FEATURE_INETD_RPC
741 p = strchr(sep->se_service, '/');
743 bb_error_msg("%s: no rpc version", sep->se_service);
747 l = strtol(p, &ccp, 0);
748 if (ccp == p || l < 0 || l > INT_MAX) {
750 bb_error_msg("%s/%s: bad rpc version", sep->se_service, p);
753 sep->se_rpcversl = sep->se_rpcversh = l;
756 l = strtol(p, &ccp, 0);
757 if (ccp == p || l < 0 || l > INT_MAX || l < sep->se_rpcversl || *ccp)
759 sep->se_rpcversh = l;
760 } else if (*ccp != '\0')
763 bb_error_msg("%s: rpc services not supported", sep->se_service);
772 char *s = strchr(arg, '.');
775 sep->se_max = xatoi(s);
777 sep->se_max = toomany;
779 sep->se_wait = strcmp(arg, "wait") == 0;
780 /* if ((arg = skip(&cp, 1)) == NULL) */
782 sep->se_user = xxstrdup(skip(&cp));
783 arg = strchr(sep->se_user, '.');
785 arg = strchr(sep->se_user, ':');
788 sep->se_group = xstrdup(arg);
790 /* if ((arg = skip(&cp, 1)) == NULL) */
793 sep->se_server = xxstrdup(skip(&cp));
794 if (strcmp(sep->se_server, "internal") == 0) {
795 #ifdef INETD_FEATURE_ENABLED
796 const struct builtin *bi;
798 for (bi = builtins; bi->bi_service; bi++)
799 if (bi->bi_socktype == sep->se_socktype
800 && strcmp(bi->bi_service, sep->se_service) == 0)
802 if (bi->bi_service == 0) {
803 bb_error_msg("internal service %s unknown", sep->se_service);
807 sep->se_wait = 0; /* = bi->bi_wait; - always 0 */
809 bb_perror_msg("internal service %s unknown", sep->se_service);
813 #ifdef INETD_FEATURE_ENABLED
818 for (arg = skip(&cp); cp; arg = skip(&cp)) {
820 sep->se_argv[argc++] = xxstrdup(arg);
822 while (argc <= MAXARGV)
823 sep->se_argv[argc++] = NULL;
826 * Now that we've processed the entire line, check if the hostname
827 * specifier was a comma separated list of hostnames. If so
828 * we'll make new entries for each address.
830 while ((hostdelim = strrchr(sep->se_hostaddr, ',')) != NULL) {
831 nsep = dupconfig(sep);
834 * NULL terminate the hostname field of the existing entry,
835 * and make a dup for the new entry.
838 nsep->se_hostaddr = xstrdup(hostdelim);
840 nsep->se_next = sep->se_next;
845 while (nsep != NULL) {
846 nsep->se_checked = 1;
847 if (nsep->se_family == AF_INET) {
848 if (LONE_CHAR(nsep->se_hostaddr, '*'))
849 nsep->se_ctrladdr_in.sin_addr.s_addr = INADDR_ANY;
850 else if (!inet_aton(nsep->se_hostaddr, &nsep->se_ctrladdr_in.sin_addr)) {
854 hp = gethostbyname(nsep->se_hostaddr);
856 bb_error_msg("%s: unknown host", nsep->se_hostaddr);
857 nsep->se_checked = 0;
860 if (hp->h_addrtype != AF_INET) {
861 bb_error_msg("%s: address isn't an Internet "
862 "address", nsep->se_hostaddr);
863 nsep->se_checked = 0;
867 memmove(&nsep->se_ctrladdr_in.sin_addr,
868 hp->h_addr_list[0], sizeof(struct in_addr));
869 while (hp->h_addr_list[i] != NULL) {
870 psep = dupconfig(nsep);
871 psep->se_hostaddr = xxstrdup(nsep->se_hostaddr);
872 psep->se_checked = 1;
873 memmove(&psep->se_ctrladdr_in.sin_addr,
874 hp->h_addr_list[i], sizeof(struct in_addr));
875 psep->se_ctrladdr_size = sizeof(psep->se_ctrladdr_in);
877 /* Prepend to list, don't want to look up */
878 /* its hostname again. */
884 /* XXX BUG?: is this skip: label supposed to remain? */
886 nsep = nsep->se_next;
890 * Finally, free any entries which failed the gethostbyname
895 while (nsep != NULL) {
898 if (nsep->se_checked == 0) {
904 nsep = nsep->se_next;
905 psep->se_next = nsep;
909 nsep->se_checked = 0;
911 nsep = nsep->se_next;
918 #define Block_Using_Signals(m) do { \
920 sigaddset(&m, SIGCHLD); \
921 sigaddset(&m, SIGHUP); \
922 sigaddset(&m, SIGALRM); \
923 sigprocmask(SIG_BLOCK, &m, NULL); \
926 static servtab_t *enter(servtab_t *cp)
934 #if ENABLE_FEATURE_INETD_RPC
935 sep->se_rpcprog = -1;
937 Block_Using_Signals(omask);
938 sep->se_next = servtab;
940 sigprocmask(SIG_UNBLOCK, &omask, NULL);
944 static int matchconf(servtab_t *old, servtab_t *new)
946 if (strcmp(old->se_service, new->se_service) != 0)
949 if (strcmp(old->se_hostaddr, new->se_hostaddr) != 0)
952 if (strcmp(old->se_proto, new->se_proto) != 0)
956 * If the new servtab is bound to a specific address, check that the
957 * old servtab is bound to the same entry. If the new service is not
958 * bound to a specific address then the check of se_hostaddr above
962 if (old->se_family == AF_INET && new->se_family == AF_INET &&
963 memcmp(&old->se_ctrladdr_in.sin_addr,
964 &new->se_ctrladdr_in.sin_addr,
965 sizeof(new->se_ctrladdr_in.sin_addr)) != 0)
968 #if ENABLE_FEATURE_IPV6
969 if (old->se_family == AF_INET6 && new->se_family == AF_INET6 &&
970 memcmp(&old->se_ctrladdr_in6.sin6_addr,
971 &new->se_ctrladdr_in6.sin6_addr,
972 sizeof(new->se_ctrladdr_in6.sin6_addr)) != 0)
978 static void config(int sig ATTRIBUTE_UNUSED)
980 servtab_t *sep, *cp, **sepp;
986 bb_perror_msg("%s", config_filename);
989 for (sep = servtab; sep; sep = sep->se_next)
993 for (sep = servtab; sep; sep = sep->se_next)
994 if (matchconf(sep, cp))
1000 #define SWAP(type, a, b) do {type c=(type)a; a=(type)b; b=(type)c;} while (0)
1002 Block_Using_Signals(omask);
1004 * sep->se_wait may be holding the pid of a daemon
1005 * that we're waiting for. If so, don't overwrite
1006 * it unless the config file explicitly says don't
1010 #ifdef INETD_FEATURE_ENABLED
1013 (sep->se_wait == 1 || cp->se_wait == 0))
1014 sep->se_wait = cp->se_wait;
1015 SWAP(int, cp->se_max, sep->se_max);
1016 SWAP(char *, sep->se_user, cp->se_user);
1017 SWAP(char *, sep->se_group, cp->se_group);
1018 SWAP(char *, sep->se_server, cp->se_server);
1019 for (i = 0; i < MAXARGV; i++)
1020 SWAP(char *, sep->se_argv[i], cp->se_argv[i]);
1023 #if ENABLE_FEATURE_INETD_RPC
1024 if (isrpcservice(sep))
1025 unregister_rpc(sep);
1026 sep->se_rpcversl = cp->se_rpcversl;
1027 sep->se_rpcversh = cp->se_rpcversh;
1029 sigprocmask(SIG_UNBLOCK, &omask, NULL);
1034 sep->se_checked = 1;
1036 switch (sep->se_family) {
1038 if (sep->se_fd != -1)
1040 (void) unlink(sep->se_service);
1041 n = strlen(sep->se_service);
1042 if (n > sizeof sep->se_ctrladdr_un.sun_path - 1)
1043 n = sizeof sep->se_ctrladdr_un.sun_path - 1;
1044 safe_strncpy(sep->se_ctrladdr_un.sun_path, sep->se_service, n + 1);
1045 sep->se_ctrladdr_un.sun_family = AF_UNIX;
1046 sep->se_ctrladdr_size = n + sizeof sep->se_ctrladdr_un.sun_family;
1050 sep->se_ctrladdr_in.sin_family = AF_INET;
1051 /* se_ctrladdr_in was set in getconfigent */
1052 sep->se_ctrladdr_size = sizeof sep->se_ctrladdr_in;
1054 #if ENABLE_FEATURE_INETD_RPC
1055 if (isrpcservice(sep)) {
1057 // FIXME: atoi_or_else(str, 0) would be handy here
1058 sep->se_rpcprog = atoi(sep->se_service);
1059 if (sep->se_rpcprog == 0) {
1060 rp = getrpcbyname(sep->se_service);
1062 bb_error_msg("%s: unknown rpc service", sep->se_service);
1065 sep->se_rpcprog = rp->r_number;
1067 if (sep->se_fd == -1)
1069 if (sep->se_fd != -1)
1074 uint16_t port = htons(atoi(sep->se_service));
1075 // FIXME: atoi_or_else(str, 0) would be handy here
1077 /*XXX*/ strncpy(protoname, sep->se_proto, sizeof(protoname));
1078 if (isdigit(protoname[strlen(protoname) - 1]))
1079 protoname[strlen(protoname) - 1] = '\0';
1080 sp = getservbyname(sep->se_service, protoname);
1082 bb_error_msg("%s/%s: unknown service",
1083 sep->se_service, sep->se_proto);
1088 if (port != sep->se_ctrladdr_in.sin_port) {
1089 sep->se_ctrladdr_in.sin_port = port;
1090 if (sep->se_fd != -1) {
1091 FD_CLR(sep->se_fd, &allsock);
1093 (void) close(sep->se_fd);
1097 if (sep->se_fd == -1)
1101 #if ENABLE_FEATURE_IPV6
1103 sep->se_ctrladdr_in6.sin6_family = AF_INET6;
1104 /* se_ctrladdr_in was set in getconfigent */
1105 sep->se_ctrladdr_size = sizeof sep->se_ctrladdr_in6;
1107 #if ENABLE_FEATURE_INETD_RPC
1108 if (isrpcservice(sep)) {
1111 sep->se_rpcprog = atoi(sep->se_service);
1112 if (sep->se_rpcprog == 0) {
1113 rp = getrpcbyname(sep->se_service);
1115 bb_error_msg("%s: unknown rpc service", sep->se_service);
1118 sep->se_rpcprog = rp->r_number;
1120 if (sep->se_fd == -1)
1122 if (sep->se_fd != -1)
1127 uint16_t port = htons(atoi(sep->se_service));
1130 /*XXX*/ strncpy(protoname, sep->se_proto, sizeof(protoname));
1131 if (isdigit(protoname[strlen(protoname) - 1]))
1132 protoname[strlen(protoname) - 1] = '\0';
1133 sp = getservbyname(sep->se_service, protoname);
1135 bb_error_msg("%s/%s: unknown service",
1136 sep->se_service, sep->se_proto);
1141 if (port != sep->se_ctrladdr_in6.sin6_port) {
1142 sep->se_ctrladdr_in6.sin6_port = port;
1143 if (sep->se_fd != -1) {
1144 FD_CLR(sep->se_fd, &allsock);
1146 (void) close(sep->se_fd);
1150 if (sep->se_fd == -1)
1154 #endif /* FEATURE_IPV6 */
1157 if (cp->se_next != NULL) {
1158 servtab_t *tmp = cp;
1164 cp = getconfigent();
1169 * Purge anything not looked at above.
1171 Block_Using_Signals(omask);
1173 while ((sep = *sepp)) {
1174 if (sep->se_checked) {
1175 sepp = &sep->se_next;
1178 *sepp = sep->se_next;
1179 if (sep->se_fd != -1) {
1180 FD_CLR(sep->se_fd, &allsock);
1182 (void) close(sep->se_fd);
1184 #if ENABLE_FEATURE_INETD_RPC
1185 if (isrpcservice(sep))
1186 unregister_rpc(sep);
1188 if (sep->se_family == AF_UNIX)
1189 (void) unlink(sep->se_service);
1193 sigprocmask(SIG_UNBLOCK, &omask, NULL);
1197 static void reapchild(int sig ATTRIBUTE_UNUSED)
1200 int save_errno = errno, status;
1204 pid = wait3(&status, WNOHANG, NULL);
1207 for (sep = servtab; sep; sep = sep->se_next)
1208 if (sep->se_wait == pid) {
1209 if (WIFEXITED(status) && WEXITSTATUS(status))
1210 bb_error_msg("%s: exit status 0x%x",
1211 sep->se_server, WEXITSTATUS(status));
1212 else if (WIFSIGNALED(status))
1213 bb_error_msg("%s: exit signal 0x%x",
1214 sep->se_server, WTERMSIG(status));
1216 FD_SET(sep->se_fd, &allsock);
1223 static void retry(int sig ATTRIBUTE_UNUSED)
1228 for (sep = servtab; sep; sep = sep->se_next) {
1229 if (sep->se_fd == -1) {
1230 switch (sep->se_family) {
1233 #if ENABLE_FEATURE_IPV6
1237 #if ENABLE_FEATURE_INETD_RPC
1238 if (sep->se_fd != -1 && isrpcservice(sep))
1247 static void goaway(int sig ATTRIBUTE_UNUSED)
1251 /* XXX signal race walking sep list */
1252 for (sep = servtab; sep; sep = sep->se_next) {
1253 if (sep->se_fd == -1)
1256 switch (sep->se_family) {
1258 (void) unlink(sep->se_service);
1261 #if ENABLE_FEATURE_IPV6
1264 #if ENABLE_FEATURE_INETD_RPC
1265 if (sep->se_wait == 1 && isrpcservice(sep))
1266 unregister_rpc(sep); /* XXX signal race */
1270 (void) close(sep->se_fd);
1272 remove_pidfile(_PATH_INETDPID);
1277 #ifdef INETD_SETPROCTITLE
1280 inetd_setproctitle(char *a, int s)
1284 struct sockaddr_in prt_sin;
1288 size = sizeof(prt_sin);
1289 (void) snprintf(buf, sizeof buf, "-%s", a);
1290 if (getpeername(s, (struct sockaddr *) &prt_sin, &size) == 0) {
1291 char *sa = inet_ntoa(prt_sin.sin_addr);
1293 buf[sizeof(buf) - 1 - strlen(sa) - 3] = '\0';
1298 strncpy(cp, buf, LastArg - cp);
1300 while (cp < LastArg)
1306 int inetd_main(int argc, char **argv);
1307 int inetd_main(int argc, char **argv)
1311 struct group *grp = NULL;
1313 struct sigaction sa, sapipe;
1318 sigset_t omask, wait_mask;
1319 #ifdef INETD_SETPROCTITLE
1325 #ifdef INETD_SETPROCTITLE
1328 if (envp == 0 || *envp == 0)
1332 LastArg = envp[-1] + strlen(envp[-1]);
1337 config_filename = NULL;
1339 opt = getopt32(argv, "R:f", &stoomany);
1341 toomany = xatoi_u(stoomany);
1345 config_filename = argv[0];
1346 if (config_filename == NULL)
1347 bb_error_msg_and_die("non-root must specify a config file");
1350 bb_daemonize_or_rexec(0, argv - optind);
1352 bb_sanitize_stdio();
1353 openlog(applet_name, LOG_PID | LOG_NOWAIT, LOG_DAEMON);
1354 logmode = LOGMODE_SYSLOG;
1357 /* If run by hand, ensure groups vector gets trashed */
1358 gid_t gid = getgid();
1362 write_pidfile(_PATH_INETDPID);
1364 if (getrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) {
1365 bb_perror_msg("getrlimit");
1367 rlim_ofile_cur = rlim_ofile.rlim_cur;
1368 if (rlim_ofile_cur == RLIM_INFINITY) /* ! */
1369 rlim_ofile_cur = OPEN_MAX;
1372 memset((char *) &sa, 0, sizeof(sa));
1373 sigemptyset(&sa.sa_mask);
1374 sigaddset(&sa.sa_mask, SIGALRM);
1375 sigaddset(&sa.sa_mask, SIGCHLD);
1376 sigaddset(&sa.sa_mask, SIGHUP);
1377 sa.sa_handler = retry;
1378 sigaction(SIGALRM, &sa, NULL);
1380 sa.sa_handler = config;
1381 sigaction(SIGHUP, &sa, NULL);
1382 sa.sa_handler = reapchild;
1383 sigaction(SIGCHLD, &sa, NULL);
1384 sa.sa_handler = goaway;
1385 sigaction(SIGTERM, &sa, NULL);
1386 sa.sa_handler = goaway;
1387 sigaction(SIGINT, &sa, NULL);
1388 sa.sa_handler = SIG_IGN;
1389 sigaction(SIGPIPE, &sa, &sapipe);
1390 memset(&wait_mask, 0, sizeof(wait_mask));
1392 /* space for daemons to overwrite environment for ps */
1393 #define DUMMYSIZE 100
1394 char dummy[DUMMYSIZE];
1396 (void) memset(dummy, 'x', DUMMYSIZE - 1);
1397 dummy[DUMMYSIZE - 1] = '\0';
1399 (void) setenv("inetd_dummy", dummy, 1);
1407 Block_Using_Signals(omask);
1409 sigsuspend(&wait_mask);
1410 sigprocmask(SIG_UNBLOCK, &omask, NULL);
1414 n = select(maxsock + 1, &readable, NULL, NULL, NULL);
1416 if (n < 0 && errno != EINTR) {
1417 bb_perror_msg("select");
1423 for (sep = servtab; n && sep; sep = sep->se_next) {
1424 if (sep->se_fd == -1 || !FD_ISSET(sep->se_fd, &readable))
1428 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) {
1429 ctrl = accept(sep->se_fd, NULL, NULL);
1433 bb_perror_msg("accept (for %s)", sep->se_service);
1436 if (sep->se_family == AF_INET && sep->se_socktype == SOCK_STREAM) {
1437 struct sockaddr_in peer;
1438 socklen_t plen = sizeof(peer);
1440 if (getpeername(ctrl, (struct sockaddr *) &peer, &plen) < 0) {
1441 bb_error_msg("cannot getpeername");
1445 if (ntohs(peer.sin_port) == 20) {
1446 /* XXX ftp bounce */
1454 Block_Using_Signals(omask);
1456 #ifdef INETD_FEATURE_ENABLED
1457 if (sep->se_bi == 0 || sep->se_bi->bi_fork)
1460 if (sep->se_count++ == 0)
1461 (void) gettimeofday(&sep->se_time, NULL);
1462 else if (toomany > 0 && sep->se_count >= sep->se_max) {
1465 (void) gettimeofday(&now, NULL);
1466 if (now.tv_sec - sep->se_time.tv_sec > CNT_INTVL) {
1470 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
1472 if (sep->se_family == AF_INET &&
1473 ntohs(sep->se_ctrladdr_in.sin_port) >= IPPORT_RESERVED) {
1475 * Cannot close it -- there are
1476 * thieves on the system.
1477 * Simply ignore the connection.
1482 bb_error_msg("%s/%s server failing (looping), service terminated",
1483 sep->se_service, sep->se_proto);
1484 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
1486 FD_CLR(sep->se_fd, &allsock);
1487 (void) close(sep->se_fd);
1491 sigprocmask(SIG_UNBLOCK, &omask, NULL);
1502 bb_perror_msg("fork");
1503 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
1505 sigprocmask(SIG_UNBLOCK, &omask, NULL);
1509 if (pid && sep->se_wait) {
1511 FD_CLR(sep->se_fd, &allsock);
1514 sigprocmask(SIG_UNBLOCK, &omask, NULL);
1516 #ifdef INETD_FEATURE_ENABLED
1518 (*sep->se_bi->bi_fn)(ctrl, sep);
1522 pwd = getpwnam(sep->se_user);
1524 bb_error_msg("getpwnam: %s: no such user", sep->se_user);
1528 bb_perror_msg("%s: setsid", sep->se_service);
1529 if (sep->se_group && (grp = getgrnam(sep->se_group)) == NULL) {
1530 bb_error_msg("getgrnam: %s: no such group", sep->se_group);
1534 /* a user running private inetd */
1535 if (uid != pwd->pw_uid)
1537 } else if (pwd->pw_uid) {
1539 pwd->pw_gid = grp->gr_gid;
1540 xsetgid((gid_t) pwd->pw_gid);
1541 initgroups(pwd->pw_name, pwd->pw_gid);
1542 xsetuid((uid_t) pwd->pw_uid);
1543 } else if (sep->se_group) {
1544 xsetgid(grp->gr_gid);
1545 setgroups(1, &grp->gr_gid);
1548 if (ctrl) close(ctrl);
1551 if (rlim_ofile.rlim_cur != rlim_ofile_cur)
1552 if (setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0)
1553 bb_perror_msg("setrlimit");
1555 for (tmpint = rlim_ofile_cur - 1; --tmpint > 2;)
1556 (void) close(tmpint);
1557 sigaction(SIGPIPE, &sapipe, NULL);
1558 execv(sep->se_server, sep->se_argv);
1559 bb_perror_msg("execv %s", sep->se_server);
1561 if (sep->se_socktype != SOCK_STREAM)
1562 recv(0, buf, sizeof(buf), 0);
1566 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
1568 } /* for (sep = servtab...) */
1573 * Internet services provided internally by inetd:
1575 #define BUFSIZE 4096
1577 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO || \
1578 ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN || \
1579 ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
1580 static int dg_badinput(struct sockaddr_in *dg_sin)
1582 if (ntohs(dg_sin->sin_port) < IPPORT_RESERVED)
1584 if (dg_sin->sin_addr.s_addr == htonl(INADDR_BROADCAST))
1586 /* XXX compare against broadcast addresses in SIOCGIFCONF list? */
1591 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
1592 /* Echo service -- echo data back */
1595 echo_stream(int s, servtab_t *sep)
1597 char buffer[BUFSIZE];
1600 inetd_setproctitle(sep->se_service, s);
1602 i = read(s, buffer, sizeof(buffer));
1604 /* FIXME: this isnt correct - safe_write()? */
1605 if (write(s, buffer, i) <= 0) break;
1610 /* Echo service -- echo data back */
1613 echo_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
1615 char buffer[BUFSIZE];
1618 /* struct sockaddr_storage ss; */
1622 i = recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size);
1625 if (dg_badinput((struct sockaddr_in *) &sa))
1627 (void) sendto(s, buffer, i, 0, &sa, sizeof(sa));
1629 #endif /* FEATURE_INETD_SUPPORT_BUILTIN_ECHO */
1631 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
1632 /* Discard service -- ignore data */
1635 discard_stream(int s, servtab_t *sep)
1637 char buffer[BUFSIZE];
1639 inetd_setproctitle(sep->se_service, s);
1642 if (read(s, buffer, sizeof(buffer)) <= 0 && errno != EINTR)
1647 /* Discard service -- ignore data */
1650 discard_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
1652 char buffer[BUFSIZE];
1654 (void) read(s, buffer, sizeof(buffer));
1656 #endif /* FEATURE_INETD_SUPPORT_BUILTIN_DISCARD */
1659 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
1668 for (i = 0; i <= 128; ++i)
1673 /* Character generator */
1676 chargen_stream(int s, servtab_t *sep)
1680 char text[LINESIZ + 2];
1682 inetd_setproctitle(sep->se_service, s);
1689 text[LINESIZ] = '\r';
1690 text[LINESIZ + 1] = '\n';
1695 memmove(text, rs, LINESIZ);
1697 memmove(text, rs, len);
1698 memmove(text + len, ring, LINESIZ - len);
1700 if (++rs == endring)
1702 if (write(s, text, sizeof(text)) != sizeof(text))
1708 /* Character generator */
1711 chargen_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
1713 /* struct sockaddr_storage ss; */
1716 char text[LINESIZ + 2];
1725 if (recvfrom(s, text, sizeof(text), 0, &sa, &size) < 0)
1727 if (dg_badinput((struct sockaddr_in *) &sa))
1730 len = endring - ringpos;
1732 memmove(text, ringpos, LINESIZ);
1734 memmove(text, ringpos, len);
1735 memmove(text + len, ring, LINESIZ - len);
1737 if (++ringpos == endring)
1739 text[LINESIZ] = '\r';
1740 text[LINESIZ + 1] = '\n';
1741 (void) sendto(s, text, sizeof(text), 0, &sa, sizeof(sa));
1743 #endif /* FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN */
1746 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME
1748 * Return a machine readable date and time, in the form of the
1749 * number of seconds since midnight, Jan 1, 1900. Since gettimeofday
1750 * returns the number of seconds since midnight, Jan 1, 1970,
1751 * we must add 2208988800 seconds to this figure to make up for
1752 * some seventy years Bell Labs was asleep.
1755 static unsigned machtime(void)
1759 if (gettimeofday(&tv, NULL) < 0) {
1760 fprintf(stderr, "Unable to get time of day\n");
1763 return htonl((unsigned) tv.tv_sec + 2208988800UL);
1768 machtime_stream(int s, servtab_t *sep ATTRIBUTE_UNUSED)
1772 result = machtime();
1773 (void) write(s, (char *) &result, sizeof(result));
1778 machtime_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
1781 /* struct sockaddr_storage ss; */
1783 struct sockaddr_in *dg_sin;
1787 if (recvfrom(s, (char *) &result, sizeof(result), 0, &sa, &size) < 0)
1789 /* if (dg_badinput((struct sockaddr *)&ss)) */
1790 dg_sin = (struct sockaddr_in *) &sa;
1791 if (dg_sin->sin_addr.s_addr == htonl(INADDR_BROADCAST) ||
1792 ntohs(dg_sin->sin_port) < IPPORT_RESERVED / 2)
1794 result = machtime();
1795 (void) sendto(s, (char *) &result, sizeof(result), 0, &sa, sizeof(sa));
1797 #endif /* FEATURE_INETD_SUPPORT_BUILTIN_TIME */
1800 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
1801 /* Return human-readable time of day */
1803 static void daytime_stream(int s, servtab_t *sep ATTRIBUTE_UNUSED)
1810 // fdprintf instead?
1811 (void) sprintf(buffer, "%.24s\r\n", ctime(&t));
1812 (void) write(s, buffer, strlen(buffer));
1815 /* Return human-readable time of day */
1818 daytime_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
1822 /* struct sockaddr_storage ss; */
1829 if (recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size) < 0)
1831 if (dg_badinput((struct sockaddr_in *) &sa))
1833 (void) sprintf(buffer, "%.24s\r\n", ctime(&t));
1834 (void) sendto(s, buffer, strlen(buffer), 0, &sa, sizeof(sa));
1836 #endif /* FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME */