1 /* vi: set sw=4 ts=4: */
2 /* $Slackware: inetd.c 1.79s 2001/02/06 13:18:00 volkerdi Exp $ */
3 /* $OpenBSD: inetd.c,v 1.79 2001/01/30 08:30:57 deraadt Exp $ */
4 /* $NetBSD: inetd.c,v 1.11 1996/02/22 11:14:41 mycroft Exp $ */
5 /* Busybox port by Vladimir Oleynik (C) 2001-2005 <dzo@simtreas.ru> */
6 /* IPv6 support, many bug fixes by Denys Vlasenko (c) 2008 */
8 * Copyright (c) 1983,1991 The Regents of the University of California.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by the University of
22 * California, Berkeley and its contributors.
23 * 4. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
25 * without specific prior written permission.
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS" AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 /* Inetd - Internet super-server
42 * This program invokes configured services when a connection
43 * from a peer is established or a datagram arrives.
44 * Connection-oriented services are invoked each time a
45 * connection is made, by creating a process. This process
46 * is passed the connection as file descriptor 0 and is
47 * expected to do a getpeername to find out peer's host
49 * Datagram oriented services are invoked when a datagram
50 * arrives; a process is created and passed a pending message
51 * on file descriptor 0. peer's address can be obtained
54 * Inetd uses a configuration file which is read at startup
55 * and, possibly, at some later time in response to a hangup signal.
56 * The configuration file is "free format" with fields given in the
57 * order shown below. Continuation lines for an entry must begin with
58 * a space or tab. All fields must be present in each entry.
60 * service_name must be in /etc/services
61 * socket_type stream/dgram/raw/rdm/seqpacket
62 * protocol must be in /etc/protocols
63 * (usually "tcp" or "udp")
64 * wait/nowait[.max] single-threaded/multi-threaded, max #
65 * user[.group] or user[:group] user/group to run daemon as
66 * server_program full path name
67 * server_program_arguments maximum of MAXARGS (20)
70 * service_name/version must be in /etc/rpc
71 * socket_type stream/dgram/raw/rdm/seqpacket
72 * rpc/protocol "rpc/tcp" etc
73 * wait/nowait[.max] single-threaded/multi-threaded
74 * user[.group] or user[:group] user to run daemon as
75 * server_program full path name
76 * server_program_arguments maximum of MAXARGS (20)
78 * For non-RPC services, the "service name" can be of the form
79 * hostaddress:servicename, in which case the hostaddress is used
80 * as the host portion of the address to listen on. If hostaddress
81 * consists of a single '*' character, INADDR_ANY is used.
83 * A line can also consist of just
85 * where hostaddress is as in the preceding paragraph. Such a line must
86 * have no further fields; the specified hostaddress is remembered and
87 * used for all further lines that have no hostaddress specified,
88 * until the next such line (or EOF). (This is why * is provided to
89 * allow explicit specification of INADDR_ANY.) A line
91 * is implicitly in effect at the beginning of the file.
93 * The hostaddress specifier may (and often will) contain dots;
94 * the service name must not.
96 * For RPC services, host-address specifiers are accepted and will
97 * work to some extent; however, because of limitations in the
98 * portmapper interface, it will not work to try to give more than
99 * one line for any given RPC service, even if the host-address
100 * specifiers are different.
102 * Comment lines are indicated by a '#' in column 1.
105 /* inetd rules for passing file descriptors to children
106 * (http://www.freebsd.org/cgi/man.cgi?query=inetd):
108 * The wait/nowait entry specifies whether the server that is invoked by
109 * inetd will take over the socket associated with the service access point,
110 * and thus whether inetd should wait for the server to exit before listen-
111 * ing for new service requests. Datagram servers must use "wait", as
112 * they are always invoked with the original datagram socket bound to the
113 * specified service address. These servers must read at least one datagram
114 * from the socket before exiting. If a datagram server connects to its
115 * peer, freeing the socket so inetd can receive further messages on the
116 * socket, it is said to be a "multi-threaded" server; it should read one
117 * datagram from the socket and create a new socket connected to the peer.
118 * It should fork, and the parent should then exit to allow inetd to check
119 * for new service requests to spawn new servers. Datagram servers which
120 * process all incoming datagrams on a socket and eventually time out are
121 * said to be "single-threaded". The comsat(8), biff(1) and talkd(8)
122 * utilities are both examples of the latter type of datagram server. The
123 * tftpd(8) utility is an example of a multi-threaded datagram server.
125 * Servers using stream sockets generally are multi-threaded and use the
126 * "nowait" entry. Connection requests for these services are accepted by
127 * inetd, and the server is given only the newly-accepted socket connected
128 * to a client of the service. Most stream-based services operate in this
129 * manner. Stream-based servers that use "wait" are started with the lis-
130 * tening service socket, and must accept at least one connection request
131 * before exiting. Such a server would normally accept and process incoming
132 * connection requests until a timeout.
135 /* Despite of above doc saying that dgram services must use "wait",
136 * "udp nowait" servers are implemented in busyboxed inetd.
137 * IPv6 addresses are also implemented. However, they may look ugly -
138 * ":::service..." means "address '::' (IPv6 wildcard addr)":"service"...
139 * You have to put "tcp6"/"udp6" in protocol field to select IPv6.
142 /* Here's the scoop concerning the user[:group] feature:
143 * 1) group is not specified:
144 * a) user = root: NO setuid() or setgid() is done
145 * b) other: initgroups(name, primary group)
146 * setgid(primary group as found in passwd)
148 * 2) group is specified:
149 * a) user = root: setgid(specified group)
152 * b) other: initgroups(name, specified group)
153 * setgid(specified group)
162 #if ENABLE_FEATURE_INETD_RPC
164 #include <rpc/pmap_clnt.h>
168 /* stream version of chargen is forking but not execing,
169 * can't do that (easily) on NOMMU */
170 #undef ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
171 #define ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN 0
174 #define _PATH_INETDPID "/var/run/inetd.pid"
176 #define CNT_INTERVAL 60 /* servers in CNT_INTERVAL sec. */
177 #define RETRYTIME 60 /* retry after bind or server fail */
179 // TODO: explain, or get rid of setrlimit games
181 #ifndef RLIMIT_NOFILE
182 #define RLIMIT_NOFILE RLIMIT_OFILE
189 /* Reserve some descriptors, 3 stdio + at least: 1 log, 1 conf. file */
192 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD \
193 || ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO \
194 || ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN \
195 || ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME \
196 || ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
197 # define INETD_BUILTINS_ENABLED
200 typedef struct servtab_t {
201 /* The most frequently referenced one: */
202 int se_fd; /* open descriptor */
203 /* NB: 'biggest fields last' saves on code size (~250 bytes) */
204 /* [addr:]service socktype proto wait user[:group] prog [args] */
205 char *se_local_hostname; /* addr to listen on */
206 char *se_service; /* "80" or "www" or "mount/2[-3]" */
207 /* socktype is in se_socktype */ /* "stream" "dgram" "raw" "rdm" "seqpacket" */
208 char *se_proto; /* "unix" or "[rpc/]tcp[6]" */
209 #if ENABLE_FEATURE_INETD_RPC
210 int se_rpcprog; /* rpc program number */
211 int se_rpcver_lo; /* rpc program lowest version */
212 int se_rpcver_hi; /* rpc program highest version */
213 #define is_rpc_service(sep) ((sep)->se_rpcver_lo != 0)
215 #define is_rpc_service(sep) 0
217 pid_t se_wait; /* 0:"nowait", 1:"wait", >1:"wait" */
218 /* and waiting for this pid */
219 socktype_t se_socktype; /* SOCK_STREAM/DGRAM/RDM/... */
220 family_t se_family; /* AF_UNIX/INET[6] */
221 /* se_proto_no is used by RPC code only... hmm */
222 smallint se_proto_no; /* IPPROTO_TCP/UDP, n/a for AF_UNIX */
223 smallint se_checked; /* looked at during merge */
224 unsigned se_max; /* allowed instances per minute */
225 unsigned se_count; /* number started since se_time */
226 unsigned se_time; /* whem we started counting */
227 char *se_user; /* user name to run as */
228 char *se_group; /* group name to run as, can be NULL */
229 #ifdef INETD_BUILTINS_ENABLED
230 const struct builtin *se_builtin; /* if built-in, description */
232 struct servtab_t *se_next;
233 len_and_sockaddr *se_lsa;
234 char *se_program; /* server program */
236 char *se_argv[MAXARGV + 1]; /* program arguments */
239 #ifdef INETD_BUILTINS_ENABLED
240 /* Echo received data */
241 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
242 static void echo_stream(int, servtab_t *);
243 static void echo_dg(int, servtab_t *);
245 /* Internet /dev/null */
246 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
247 static void discard_stream(int, servtab_t *);
248 static void discard_dg(int, servtab_t *);
250 /* Return 32 bit time since 1900 */
251 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME
252 static void machtime_stream(int, servtab_t *);
253 static void machtime_dg(int, servtab_t *);
255 /* Return human-readable time */
256 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
257 static void daytime_stream(int, servtab_t *);
258 static void daytime_dg(int, servtab_t *);
260 /* Familiar character generator */
261 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
262 static void chargen_stream(int, servtab_t *);
263 static void chargen_dg(int, servtab_t *);
267 /* NB: not necessarily NUL terminated */
268 char bi_service7[7]; /* internally provided service name */
269 uint8_t bi_fork; /* 1 if stream fn should run in child */
270 void (*bi_stream_fn)(int, servtab_t *);
271 void (*bi_dgram_fn)(int, servtab_t *);
274 static const struct builtin builtins[] = {
275 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
276 { "echo", 1, echo_stream, echo_dg },
278 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
279 { "discard", 1, discard_stream, discard_dg },
281 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
282 { "chargen", 1, chargen_stream, chargen_dg },
284 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME
285 { "time", 0, machtime_stream, machtime_dg },
287 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
288 { "daytime", 0, daytime_stream, daytime_dg },
291 #endif /* INETD_BUILTINS_ENABLED */
294 rlim_t rlim_ofile_cur;
295 struct rlimit rlim_ofile;
296 servtab_t *serv_list;
300 unsigned max_concurrency;
301 smallint alarm_armed;
302 uid_t real_uid; /* user ID who ran us */
303 unsigned config_lineno;
304 const char *config_filename;
306 char *default_local_hostname;
307 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
313 /* Used in next_line(), and as scratch read buffer */
314 char line[256]; /* _at least_ 256, see LINE_SIZE */
316 #define G (*(struct globals*)&bb_common_bufsiz1)
317 enum { LINE_SIZE = COMMON_BUFSIZE - offsetof(struct globals, line) };
318 struct BUG_G_too_big {
319 char BUG_G_too_big[sizeof(G) <= COMMON_BUFSIZE ? 1 : -1];
321 #define rlim_ofile_cur (G.rlim_ofile_cur )
322 #define rlim_ofile (G.rlim_ofile )
323 #define serv_list (G.serv_list )
324 #define global_queuelen (G.global_queuelen)
325 #define prev_maxsock (G.prev_maxsock )
326 #define maxsock (G.maxsock )
327 #define max_concurrency (G.max_concurrency)
328 #define alarm_armed (G.alarm_armed )
329 #define real_uid (G.real_uid )
330 #define config_lineno (G.config_lineno )
331 #define config_filename (G.config_filename)
332 #define fconfig (G.fconfig )
333 #define default_local_hostname (G.default_local_hostname)
334 #define first_ps_byte (G.first_ps_byte )
335 #define last_ps_byte (G.last_ps_byte )
336 #define end_ring (G.end_ring )
337 #define ring_pos (G.ring_pos )
338 #define ring (G.ring )
339 #define allsock (G.allsock )
340 #define line (G.line )
341 #define INIT_G() do { \
342 rlim_ofile_cur = OPEN_MAX; \
343 global_queuelen = 128; \
344 config_filename = "/etc/inetd.conf"; \
347 static void maybe_close(int fd)
353 // TODO: move to libbb?
354 static len_and_sockaddr *xzalloc_lsa(int family)
356 len_and_sockaddr *lsa;
359 sz = sizeof(struct sockaddr_in);
360 if (family == AF_UNIX)
361 sz = sizeof(struct sockaddr_un);
362 #if ENABLE_FEATURE_IPV6
363 if (family == AF_INET6)
364 sz = sizeof(struct sockaddr_in6);
366 lsa = xzalloc(LSA_LEN_SIZE + sz);
368 lsa->u.sa.sa_family = family;
372 static void rearm_alarm(void)
380 static void block_CHLD_HUP_ALRM(sigset_t *m)
383 sigaddset(m, SIGCHLD);
384 sigaddset(m, SIGHUP);
385 sigaddset(m, SIGALRM);
386 sigprocmask(SIG_BLOCK, m, m); /* old sigmask is stored in m */
389 static void restore_sigmask(sigset_t *m)
391 sigprocmask(SIG_SETMASK, m, NULL);
394 #if ENABLE_FEATURE_INETD_RPC
395 static void register_rpc(servtab_t *sep)
398 struct sockaddr_in ir_sin;
401 size = sizeof(ir_sin);
402 if (getsockname(sep->se_fd, (struct sockaddr *) &ir_sin, &size) < 0) {
403 bb_perror_msg("getsockname");
407 for (n = sep->se_rpcver_lo; n <= sep->se_rpcver_hi; n++) {
408 pmap_unset(sep->se_rpcprog, n);
409 if (!pmap_set(sep->se_rpcprog, n, sep->se_proto_no, ntohs(ir_sin.sin_port)))
410 bb_perror_msg("%s %s: pmap_set(%u,%u,%u,%u)",
411 sep->se_service, sep->se_proto,
412 sep->se_rpcprog, n, sep->se_proto_no, ntohs(ir_sin.sin_port));
416 static void unregister_rpc(servtab_t *sep)
420 for (n = sep->se_rpcver_lo; n <= sep->se_rpcver_hi; n++) {
421 if (!pmap_unset(sep->se_rpcprog, n))
422 bb_perror_msg("pmap_unset(%u,%u)", sep->se_rpcprog, n);
425 #endif /* FEATURE_INETD_RPC */
427 static void bump_nofile(void)
429 enum { FD_CHUNK = 32 };
432 /* Never fails under Linux (except if you pass it bad arguments) */
433 getrlimit(RLIMIT_NOFILE, &rl);
434 rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK);
435 rl.rlim_cur = MIN(FD_SETSIZE, rl.rlim_cur + FD_CHUNK);
436 if (rl.rlim_cur <= rlim_ofile_cur) {
437 bb_error_msg("can't extend file limit, max = %d",
442 if (setrlimit(RLIMIT_NOFILE, &rl) < 0) {
443 bb_perror_msg("setrlimit");
447 rlim_ofile_cur = rl.rlim_cur;
450 static void remove_fd_from_set(int fd)
453 FD_CLR(fd, &allsock);
458 static void add_fd_to_set(int fd)
461 FD_SET(fd, &allsock);
462 if (maxsock >= 0 && fd > maxsock) {
463 prev_maxsock = maxsock = fd;
464 if ((rlim_t)maxsock > rlim_ofile_cur - FD_MARGIN)
470 static void recalculate_maxsock(void)
473 while (fd <= prev_maxsock) {
474 if (FD_ISSET(fd, &allsock))
478 prev_maxsock = maxsock;
479 if ((rlim_t)maxsock > rlim_ofile_cur - FD_MARGIN)
483 static void prepare_socket_fd(servtab_t *sep)
487 fd = socket(sep->se_family, sep->se_socktype, 0);
489 bb_perror_msg("socket");
492 setsockopt_reuseaddr(fd);
494 #if ENABLE_FEATURE_INETD_RPC
495 if (is_rpc_service(sep)) {
498 /* zero out the port for all RPC services; let bind()
500 set_nport(sep->se_lsa, 0);
502 /* for RPC services, attempt to use a reserved port
503 * if they are going to be running as root. */
504 if (real_uid == 0 && sep->se_family == AF_INET
505 && (pwd = getpwnam(sep->se_user)) != NULL
508 r = bindresvport(fd, &sep->se_lsa->u.sin);
510 r = bind(fd, &sep->se_lsa->u.sa, sep->se_lsa->len);
513 int saveerrno = errno;
514 /* update lsa with port# */
515 getsockname(fd, &sep->se_lsa->u.sa, &sep->se_lsa->len);
521 if (sep->se_family == AF_UNIX) {
522 struct sockaddr_un *sun;
523 sun = (struct sockaddr_un*)&(sep->se_lsa->u.sa);
524 unlink(sun->sun_path);
526 r = bind(fd, &sep->se_lsa->u.sa, sep->se_lsa->len);
529 bb_perror_msg("%s/%s: bind",
530 sep->se_service, sep->se_proto);
535 if (sep->se_socktype == SOCK_STREAM)
536 listen(fd, global_queuelen);
542 static int reopen_config_file(void)
544 free(default_local_hostname);
545 default_local_hostname = xstrdup("*");
549 fconfig = fopen_or_warn(config_filename, "r");
550 return (fconfig != NULL);
553 static void close_config_file(void)
561 static char *next_line(void)
563 if (fgets(line, LINE_SIZE, fconfig) == NULL)
566 *strchrnul(line, '\n') = '\0';
570 static char *next_word(char **cpp)
578 while (*cp == ' ' || *cp == '\t')
581 int c = getc(fconfig);
583 if (c == ' ' || c == '\t') {
592 while (*cp && *cp != ' ' && *cp != '\t')
601 static void free_servtab_strings(servtab_t *cp)
605 free(cp->se_local_hostname);
606 free(cp->se_service);
610 free(cp->se_lsa); /* not a string in fact */
611 free(cp->se_program);
612 for (i = 0; i < MAXARGV; i++)
613 free(cp->se_argv[i]);
616 static servtab_t *new_servtab(void)
618 servtab_t *newtab = xzalloc(sizeof(servtab_t));
619 newtab->se_fd = -1; /* paranoia */
623 static servtab_t *dup_servtab(servtab_t *sep)
628 newtab = new_servtab();
629 *newtab = *sep; /* struct copy */
630 /* deep-copying strings */
631 newtab->se_service = xstrdup(newtab->se_service);
632 newtab->se_proto = xstrdup(newtab->se_proto);
633 newtab->se_user = xstrdup(newtab->se_user);
634 newtab->se_group = xstrdup(newtab->se_group);
635 newtab->se_program = xstrdup(newtab->se_program);
636 for (argc = 0; argc <= MAXARGV; argc++)
637 newtab->se_argv[argc] = xstrdup(newtab->se_argv[argc]);
638 /* NB: se_fd, se_hostaddr and se_next are always
639 * overwrittend by callers, so we don't bother resetting them
640 * to NULL/0/-1 etc */
645 /* gcc generates much more code if this is inlined */
646 static NOINLINE servtab_t *parse_one_line(void)
656 while ((cp = next_line()) && *cp == '#')
657 continue; /* skip comment lines */
663 arg = next_word(&cp);
664 if (arg == NULL) /* a blank line. */
667 /* [host:]service socktype proto wait user[:group] prog [args] */
668 /* Check for "host:...." line */
669 hostdelim = strrchr(arg, ':');
672 sep->se_local_hostname = xstrdup(arg);
675 arg = next_word(&cp);
677 /* Line has just "host:", change the
678 * default host for the following lines. */
679 free(default_local_hostname);
680 default_local_hostname = sep->se_local_hostname;
685 sep->se_local_hostname = xstrdup(default_local_hostname);
687 /* service socktype proto wait user[:group] prog [args] */
688 sep->se_service = xstrdup(arg);
689 /* socktype proto wait user[:group] prog [args] */
690 arg = next_word(&cp);
693 bb_error_msg("parse error on line %u, line is ignored",
695 free_servtab_strings(sep);
696 /* Just "goto more" can make sep to carry over e.g.
697 * "rpc"-ness (by having se_rpcver_lo != 0).
698 * We will be more paranoid: */
703 static int8_t SOCK_xxx[] ALIGN1 = {
705 SOCK_STREAM, SOCK_DGRAM, SOCK_RDM,
706 SOCK_SEQPACKET, SOCK_RAW
708 sep->se_socktype = SOCK_xxx[1 + index_in_strings(
709 "stream""\0" "dgram""\0" "rdm""\0"
710 "seqpacket""\0" "raw""\0"
714 /* {unix,[rpc/]{tcp,udp}[6]} wait user[:group] prog [args] */
715 sep->se_proto = arg = xstrdup(next_word(&cp));
718 if (strcmp(arg, "unix") == 0) {
719 sep->se_family = AF_UNIX;
722 sep->se_family = AF_INET;
723 six = last_char_is(arg, '6');
725 #if ENABLE_FEATURE_IPV6
727 sep->se_family = AF_INET6;
729 bb_error_msg("%s: no support for IPv6", sep->se_proto);
733 if (strncmp(arg, "rpc/", 4) == 0) {
734 #if ENABLE_FEATURE_INETD_RPC
737 p = strchr(sep->se_service, '/');
739 bb_error_msg("no rpc version: '%s'", sep->se_service);
743 n = bb_strtou(p, &p, 10);
746 bb_error_msg("bad rpc version");
749 sep->se_rpcver_lo = sep->se_rpcver_hi = n;
752 n = bb_strtou(p, &p, 10);
753 if (n > INT_MAX || (int)n < sep->se_rpcver_lo)
755 sep->se_rpcver_hi = n;
760 bb_error_msg("no support for rpc services");
764 /* we don't really need getprotobyname()! */
765 if (strcmp(arg, "tcp") == 0)
766 sep->se_proto_no = IPPROTO_TCP; /* = 6 */
767 if (strcmp(arg, "udp") == 0)
768 sep->se_proto_no = IPPROTO_UDP; /* = 17 */
771 if (!sep->se_proto_no) /* not tcp/udp?? */
775 /* [no]wait[.max] user[:group] prog [args] */
776 arg = next_word(&cp);
779 sep->se_max = max_concurrency;
780 p = strchr(arg, '.');
783 sep->se_max = bb_strtou(p, NULL, 10);
787 sep->se_wait = (arg[0] != 'n' || arg[1] != 'o');
788 if (!sep->se_wait) /* "no" seen */
790 if (strcmp(arg, "wait") != 0)
793 /* user[:group] prog [args] */
794 sep->se_user = xstrdup(next_word(&cp));
795 if (sep->se_user == NULL)
797 arg = strchr(sep->se_user, '.');
799 arg = strchr(sep->se_user, ':');
802 sep->se_group = xstrdup(arg);
806 sep->se_program = xstrdup(next_word(&cp));
807 if (sep->se_program == NULL)
809 #ifdef INETD_BUILTINS_ENABLED
810 if (strcmp(sep->se_program, "internal") == 0
811 && strlen(sep->se_service) <= 7
812 && (sep->se_socktype == SOCK_STREAM
813 || sep->se_socktype == SOCK_DGRAM)
816 for (i = 0; i < ARRAY_SIZE(builtins); i++)
817 if (strncmp(builtins[i].bi_service7, sep->se_service, 7) == 0)
819 bb_error_msg("unknown internal service %s", sep->se_service);
822 sep->se_builtin = &builtins[i];
823 /* stream builtins must be "nowait", dgram must be "wait" */
824 if (sep->se_wait != (sep->se_socktype == SOCK_DGRAM))
829 while ((arg = next_word(&cp)) != NULL && argc < MAXARGV)
830 sep->se_argv[argc++] = xstrdup(arg);
832 /* catch mixups. "<service> stream udp ..." == wtf */
833 if (sep->se_socktype == SOCK_STREAM) {
834 if (sep->se_proto_no == IPPROTO_UDP)
837 if (sep->se_socktype == SOCK_DGRAM) {
838 if (sep->se_proto_no == IPPROTO_TCP)
842 /* check if the hostname specifier is a comma separated list
843 * of hostnames. we'll make new entries for each address. */
844 while ((hostdelim = strrchr(sep->se_local_hostname, ',')) != NULL) {
845 nsep = dup_servtab(sep);
846 /* NUL terminate the hostname field of the existing entry,
847 * and make a dup for the new entry. */
849 nsep->se_local_hostname = xstrdup(hostdelim);
850 nsep->se_next = sep->se_next;
854 /* was doing it here: */
855 /* DNS resolution, create copies for each IP address */
856 /* IPv6-ization destroyed it :( */
861 static servtab_t *insert_in_servlist(servtab_t *cp)
867 *sep = *cp; /* struct copy */
869 #if ENABLE_FEATURE_INETD_RPC
870 sep->se_rpcprog = -1;
872 block_CHLD_HUP_ALRM(&omask);
873 sep->se_next = serv_list;
875 restore_sigmask(&omask);
879 static int same_serv_addr_proto(servtab_t *old, servtab_t *new)
881 if (strcmp(old->se_local_hostname, new->se_local_hostname) != 0)
883 if (strcmp(old->se_service, new->se_service) != 0)
885 if (strcmp(old->se_proto, new->se_proto) != 0)
890 static void reread_config_file(int sig UNUSED_PARAM)
892 servtab_t *sep, *cp, **sepp;
893 len_and_sockaddr *lsa;
897 int save_errno = errno;
899 if (!reopen_config_file())
901 for (sep = serv_list; sep; sep = sep->se_next)
908 cp = parse_one_line();
912 for (sep = serv_list; sep; sep = sep->se_next)
913 if (same_serv_addr_proto(sep, cp))
915 /* not an "equal" servtab */
916 sep = insert_in_servlist(cp);
922 block_CHLD_HUP_ALRM(&omask);
923 #if ENABLE_FEATURE_INETD_RPC
924 if (is_rpc_service(sep))
926 sep->se_rpcver_lo = cp->se_rpcver_lo;
927 sep->se_rpcver_hi = cp->se_rpcver_hi;
929 if (cp->se_wait == 0) {
930 /* New config says "nowait". If old one
931 * was "wait", we currently may be waiting
932 * for a child (and not accepting connects).
933 * Stop waiting, start listening again.
934 * (if it's not true, this op is harmless) */
935 add_fd_to_set(sep->se_fd);
937 sep->se_wait = cp->se_wait;
938 sep->se_max = cp->se_max;
939 /* string fields need more love - we don't want to leak them */
940 #define SWAP(type, a, b) do { type c = (type)a; a = (type)b; b = (type)c; } while (0)
941 SWAP(char*, sep->se_user, cp->se_user);
942 SWAP(char*, sep->se_group, cp->se_group);
943 SWAP(char*, sep->se_program, cp->se_program);
944 for (i = 0; i < MAXARGV; i++)
945 SWAP(char*, sep->se_argv[i], cp->se_argv[i]);
947 restore_sigmask(&omask);
948 free_servtab_strings(cp);
951 /* cp->string_fields are consumed by insert_in_servlist()
952 * or freed at this point, cp itself is not yet freed. */
955 /* create new len_and_sockaddr */
956 switch (sep->se_family) {
957 struct sockaddr_un *sun;
959 lsa = xzalloc_lsa(AF_UNIX);
960 sun = (struct sockaddr_un*)&lsa->u.sa;
961 safe_strncpy(sun->sun_path, sep->se_service, sizeof(sun->sun_path));
964 default: /* case AF_INET, case AF_INET6 */
965 n = bb_strtou(sep->se_service, NULL, 10);
966 #if ENABLE_FEATURE_INETD_RPC
967 if (is_rpc_service(sep)) {
969 if (errno) { /* se_service is not numeric */
970 struct rpcent *rp = getrpcbyname(sep->se_service);
972 bb_error_msg("%s: unknown rpc service", sep->se_service);
975 sep->se_rpcprog = rp->r_number;
977 if (sep->se_fd == -1)
978 prepare_socket_fd(sep);
979 if (sep->se_fd != -1)
984 /* what port to listen on? */
986 if (errno || n > 0xffff) { /* se_service is not numeric */
989 /* can result only in "tcp" or "udp": */
990 safe_strncpy(protoname, sep->se_proto, 4);
991 sp = getservbyname(sep->se_service, protoname);
993 bb_error_msg("%s/%s: unknown service",
994 sep->se_service, sep->se_proto);
999 if (LONE_CHAR(sep->se_local_hostname, '*')) {
1000 lsa = xzalloc_lsa(sep->se_family);
1001 set_nport(lsa, port);
1003 lsa = host_and_af2sockaddr(sep->se_local_hostname,
1004 ntohs(port), sep->se_family);
1006 bb_error_msg("%s/%s: unknown host '%s'",
1007 sep->se_service, sep->se_proto,
1008 sep->se_local_hostname);
1013 } /* end of "switch (sep->se_family)" */
1015 /* did lsa change? Then close/open */
1016 if (sep->se_lsa == NULL
1017 || lsa->len != sep->se_lsa->len
1018 || memcmp(&lsa->u.sa, &sep->se_lsa->u.sa, lsa->len) != 0
1020 remove_fd_from_set(sep->se_fd);
1021 maybe_close(sep->se_fd);
1028 if (sep->se_fd == -1)
1029 prepare_socket_fd(sep);
1034 } /* end of "while (1) parse lines" */
1035 close_config_file();
1037 /* Purge anything not looked at above - these are stale entries,
1038 * new config file doesnt have them. */
1039 block_CHLD_HUP_ALRM(&omask);
1041 while ((sep = *sepp)) {
1042 if (sep->se_checked) {
1043 sepp = &sep->se_next;
1046 *sepp = sep->se_next;
1047 remove_fd_from_set(sep->se_fd);
1048 maybe_close(sep->se_fd);
1049 #if ENABLE_FEATURE_INETD_RPC
1050 if (is_rpc_service(sep))
1051 unregister_rpc(sep);
1053 if (sep->se_family == AF_UNIX)
1054 unlink(sep->se_service);
1055 free_servtab_strings(sep);
1058 restore_sigmask(&omask);
1063 static void reap_child(int sig UNUSED_PARAM)
1068 int save_errno = errno;
1071 pid = wait_any_nohang(&status);
1074 for (sep = serv_list; sep; sep = sep->se_next) {
1075 if (sep->se_wait != pid)
1077 /* One of our "wait" services */
1078 if (WIFEXITED(status) && WEXITSTATUS(status))
1079 bb_error_msg("%s: exit status 0x%x",
1080 sep->se_program, WEXITSTATUS(status));
1081 else if (WIFSIGNALED(status))
1082 bb_error_msg("%s: exit signal 0x%x",
1083 sep->se_program, WTERMSIG(status));
1085 add_fd_to_set(sep->se_fd);
1092 static void retry_network_setup(int sig UNUSED_PARAM)
1094 int save_errno = errno;
1098 for (sep = serv_list; sep; sep = sep->se_next) {
1099 if (sep->se_fd == -1) {
1100 prepare_socket_fd(sep);
1101 #if ENABLE_FEATURE_INETD_RPC
1102 if (sep->se_fd != -1 && is_rpc_service(sep))
1110 static void clean_up_and_exit(int sig UNUSED_PARAM)
1114 /* XXX signal race walking sep list */
1115 for (sep = serv_list; sep; sep = sep->se_next) {
1116 if (sep->se_fd == -1)
1119 switch (sep->se_family) {
1121 unlink(sep->se_service);
1123 default: /* case AF_INET, AF_INET6 */
1124 #if ENABLE_FEATURE_INETD_RPC
1125 if (sep->se_wait == 1 && is_rpc_service(sep))
1126 unregister_rpc(sep); /* XXX signal race */
1130 if (ENABLE_FEATURE_CLEAN_UP)
1133 remove_pidfile(_PATH_INETDPID);
1137 int inetd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1138 int inetd_main(int argc UNUSED_PARAM, char **argv)
1140 struct sigaction sa, saved_pipe_handler;
1141 servtab_t *sep, *sep2;
1143 struct group *grp = grp; /* for compiler */
1150 real_uid = getuid();
1151 if (real_uid != 0) /* run by non-root user */
1152 config_filename = NULL;
1154 opt_complementary = "R+:q+"; /* -q N, -R N */
1155 opt = getopt32(argv, "R:feq:", &max_concurrency, &global_queuelen);
1159 config_filename = argv[0];
1160 if (config_filename == NULL)
1161 bb_error_msg_and_die("non-root must specify config file");
1163 bb_daemonize_or_rexec(0, argv - optind);
1165 bb_sanitize_stdio();
1167 openlog(applet_name, LOG_PID | LOG_NOWAIT, LOG_DAEMON);
1168 logmode = LOGMODE_SYSLOG;
1171 if (real_uid == 0) {
1172 /* run by root, ensure groups vector gets trashed */
1173 gid_t gid = getgid();
1177 write_pidfile(_PATH_INETDPID);
1179 /* never fails under Linux (except if you pass it bad arguments) */
1180 getrlimit(RLIMIT_NOFILE, &rlim_ofile);
1181 rlim_ofile_cur = rlim_ofile.rlim_cur;
1182 if (rlim_ofile_cur == RLIM_INFINITY) /* ! */
1183 rlim_ofile_cur = OPEN_MAX;
1185 memset(&sa, 0, sizeof(sa));
1186 /*sigemptyset(&sa.sa_mask); - memset did it */
1187 sigaddset(&sa.sa_mask, SIGALRM);
1188 sigaddset(&sa.sa_mask, SIGCHLD);
1189 sigaddset(&sa.sa_mask, SIGHUP);
1190 sa.sa_handler = retry_network_setup;
1191 sigaction_set(SIGALRM, &sa);
1192 sa.sa_handler = reread_config_file;
1193 sigaction_set(SIGHUP, &sa);
1194 sa.sa_handler = reap_child;
1195 sigaction_set(SIGCHLD, &sa);
1196 sa.sa_handler = clean_up_and_exit;
1197 sigaction_set(SIGTERM, &sa);
1198 sa.sa_handler = clean_up_and_exit;
1199 sigaction_set(SIGINT, &sa);
1200 sa.sa_handler = SIG_IGN;
1201 sigaction(SIGPIPE, &sa, &saved_pipe_handler);
1203 reread_config_file(SIGHUP); /* load config from file */
1207 int ctrl, accepted_fd, new_udp_fd;
1211 recalculate_maxsock();
1213 readable = allsock; /* struct copy */
1214 /* if there are no fds to wait on, we will block
1215 * until signal wakes us up */
1216 ready_fd_cnt = select(maxsock + 1, &readable, NULL, NULL, NULL);
1217 if (ready_fd_cnt < 0) {
1218 if (errno != EINTR) {
1219 bb_perror_msg("select");
1225 for (sep = serv_list; ready_fd_cnt && sep; sep = sep->se_next) {
1226 if (sep->se_fd == -1 || !FD_ISSET(sep->se_fd, &readable))
1233 if (!sep->se_wait) {
1234 if (sep->se_socktype == SOCK_STREAM) {
1235 ctrl = accepted_fd = accept(sep->se_fd, NULL, NULL);
1238 bb_perror_msg("accept (for %s)", sep->se_service);
1243 if (sep->se_socktype == SOCK_DGRAM
1244 && sep->se_family != AF_UNIX
1246 /* How udp "nowait" works:
1247 * child peeks at (received and buffered by kernel) UDP packet,
1248 * performs connect() on the socket so that it is linked only
1249 * to this peer. But this also affects parent, because descriptors
1250 * are shared after fork() a-la dup(). When parent performs
1251 * select(), it will see this descriptor connected to the peer (!)
1252 * and still readable, will act on it and mess things up
1253 * (can create many copies of same child, etc).
1254 * Parent must create and use new socket instead. */
1255 new_udp_fd = socket(sep->se_family, SOCK_DGRAM, 0);
1256 if (new_udp_fd < 0) { /* error: eat packet, forget about it */
1258 recv(sep->se_fd, line, LINE_SIZE, MSG_DONTWAIT);
1261 setsockopt_reuseaddr(new_udp_fd);
1262 /* TODO: better do bind after vfork in parent,
1263 * so that we don't have two wildcard bound sockets
1264 * even for a brief moment? */
1265 if (bind(new_udp_fd, &sep->se_lsa->u.sa, sep->se_lsa->len) < 0) {
1272 block_CHLD_HUP_ALRM(&omask);
1274 #ifdef INETD_BUILTINS_ENABLED
1275 /* do we need to fork? */
1276 if (sep->se_builtin == NULL
1277 || (sep->se_socktype == SOCK_STREAM
1278 && sep->se_builtin->bi_fork))
1281 if (sep->se_max != 0) {
1282 if (++sep->se_count == 1)
1283 sep->se_time = monotonic_sec();
1284 else if (sep->se_count >= sep->se_max) {
1285 unsigned now = monotonic_sec();
1286 /* did we accumulate se_max connects too quickly? */
1287 if (now - sep->se_time <= CNT_INTERVAL) {
1288 bb_error_msg("%s/%s: too many connections, pausing",
1289 sep->se_service, sep->se_proto);
1290 remove_fd_from_set(sep->se_fd);
1294 rearm_alarm(); /* will revive it in RETRYTIME sec */
1295 restore_sigmask(&omask);
1296 maybe_close(accepted_fd);
1297 continue; /* -> check next fd in fd set */
1302 /* on NOMMU, streamed chargen
1303 * builtin wouldn't work, but it is
1304 * not allowed on NOMMU (ifdefed out) */
1305 #ifdef INETD_BUILTINS_ENABLED
1306 if (BB_MMU && sep->se_builtin)
1312 if (pid < 0) { /* fork error */
1313 bb_perror_msg("fork");
1315 restore_sigmask(&omask);
1316 maybe_close(accepted_fd);
1317 continue; /* -> check next fd in fd set */
1320 pid--; /* -1: "we did fork and we are child" */
1322 /* if pid == 0 here, we never forked */
1324 if (pid > 0) { /* parent */
1326 /* tcp wait: we passed listening socket to child,
1327 * will wait for child to terminate */
1329 remove_fd_from_set(sep->se_fd);
1331 if (new_udp_fd >= 0) {
1332 /* udp nowait: child connected the socket,
1333 * we created and will use new, unconnected one */
1334 xmove_fd(new_udp_fd, sep->se_fd);
1336 restore_sigmask(&omask);
1337 maybe_close(accepted_fd);
1338 continue; /* -> check next fd in fd set */
1341 /* we are either child or didn't vfork at all */
1342 #ifdef INETD_BUILTINS_ENABLED
1343 if (sep->se_builtin) {
1344 if (pid) { /* "pid" is -1: we did vfork */
1345 close(sep->se_fd); /* listening socket */
1346 logmode = 0; /* make xwrite etc silent */
1348 restore_sigmask(&omask);
1349 if (sep->se_socktype == SOCK_STREAM)
1350 sep->se_builtin->bi_stream_fn(ctrl, sep);
1352 sep->se_builtin->bi_dgram_fn(ctrl, sep);
1353 if (pid) /* we did vfork */
1354 _exit(EXIT_FAILURE);
1355 maybe_close(accepted_fd);
1356 continue; /* -> check next fd in fd set */
1362 if (new_udp_fd >= 0) {
1363 len_and_sockaddr *lsa = xzalloc_lsa(sep->se_family);
1364 /* peek at the packet and remember peer addr */
1365 int r = recvfrom(ctrl, NULL, 0, MSG_PEEK|MSG_DONTWAIT,
1366 &lsa->u.sa, &lsa->len);
1369 /* make this socket "connected" to peer addr:
1370 * only packets from this peer will be recv'ed,
1371 * and bare write()/send() will work on it */
1372 connect(ctrl, &lsa->u.sa, lsa->len);
1375 /* prepare env and exec program */
1376 pwd = getpwnam(sep->se_user);
1378 bb_error_msg("%s: no such %s", sep->se_user, "user");
1381 if (sep->se_group && (grp = getgrnam(sep->se_group)) == NULL) {
1382 bb_error_msg("%s: no such %s", sep->se_group, "group");
1385 if (real_uid != 0 && real_uid != pwd->pw_uid) {
1386 /* a user running private inetd */
1387 bb_error_msg("non-root must run services as himself");
1392 pwd->pw_gid = grp->gr_gid;
1393 /* initgroups, setgid, setuid: */
1394 change_identity(pwd);
1395 } else if (sep->se_group) {
1396 xsetgid(grp->gr_gid);
1397 setgroups(1, &grp->gr_gid);
1399 if (rlim_ofile.rlim_cur != rlim_ofile_cur)
1400 if (setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0)
1401 bb_perror_msg("setrlimit");
1406 /* NB: among others, this loop closes listening socket
1407 * for nowait stream children */
1408 for (sep2 = serv_list; sep2; sep2 = sep2->se_next)
1409 maybe_close(sep2->se_fd);
1410 sigaction_set(SIGPIPE, &saved_pipe_handler);
1411 restore_sigmask(&omask);
1412 BB_EXECVP(sep->se_program, sep->se_argv);
1413 bb_perror_msg("exec %s", sep->se_program);
1415 /* eat packet in udp case */
1416 if (sep->se_socktype != SOCK_STREAM)
1417 recv(0, line, LINE_SIZE, MSG_DONTWAIT);
1418 _exit(EXIT_FAILURE);
1419 } /* for (sep = servtab...) */
1424 static const char *const cat_args[] = { "cat", NULL };
1428 * Internet services provided internally by inetd:
1430 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
1431 /* Echo service -- echo data back. */
1433 static void echo_stream(int s, servtab_t *sep UNUSED_PARAM)
1437 ssize_t sz = safe_read(s, line, LINE_SIZE);
1440 xwrite(s, line, sz);
1443 /* We are after vfork here! */
1444 /* move network socket to stdin/stdout */
1445 xmove_fd(s, STDIN_FILENO);
1446 xdup2(STDIN_FILENO, STDOUT_FILENO);
1447 /* no error messages please... */
1448 close(STDERR_FILENO);
1449 xopen(bb_dev_null, O_WRONLY);
1450 BB_EXECVP("cat", (char**)cat_args);
1451 /* on failure we return to main, which does exit(EXIT_FAILURE) */
1454 static void echo_dg(int s, servtab_t *sep)
1456 enum { BUFSIZE = 12*1024 }; /* for jumbo sized packets! :) */
1457 char *buf = xmalloc(BUFSIZE); /* too big for stack */
1459 len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
1461 lsa->len = sep->se_lsa->len;
1462 /* dgram builtins are non-forking - DONT BLOCK! */
1463 sz = recvfrom(s, buf, BUFSIZE, MSG_DONTWAIT, &lsa->u.sa, &lsa->len);
1465 sendto(s, buf, sz, 0, &lsa->u.sa, lsa->len);
1468 #endif /* FEATURE_INETD_SUPPORT_BUILTIN_ECHO */
1471 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
1472 /* Discard service -- ignore data. MMU arches only. */
1474 static void discard_stream(int s, servtab_t *sep UNUSED_PARAM)
1477 while (safe_read(s, line, LINE_SIZE) > 0)
1480 /* We are after vfork here! */
1481 /* move network socket to stdin */
1482 xmove_fd(s, STDIN_FILENO);
1483 /* discard output */
1484 close(STDOUT_FILENO);
1485 xopen(bb_dev_null, O_WRONLY);
1486 /* no error messages please... */
1487 xdup2(STDOUT_FILENO, STDERR_FILENO);
1488 BB_EXECVP("cat", (char**)cat_args);
1489 /* on failure we return to main, which does exit(EXIT_FAILURE) */
1493 static void discard_dg(int s, servtab_t *sep UNUSED_PARAM)
1495 /* dgram builtins are non-forking - DONT BLOCK! */
1496 recv(s, line, LINE_SIZE, MSG_DONTWAIT);
1498 #endif /* FEATURE_INETD_SUPPORT_BUILTIN_DISCARD */
1501 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
1503 static void init_ring(void)
1508 for (i = 0; i <= 128; ++i)
1512 /* Character generator. MMU arches only. */
1514 static void chargen_stream(int s, servtab_t *sep UNUSED_PARAM)
1518 char text[LINESIZ + 2];
1525 text[LINESIZ] = '\r';
1526 text[LINESIZ + 1] = '\n';
1529 len = end_ring - rs;
1531 memmove(text, rs, LINESIZ);
1533 memmove(text, rs, len);
1534 memmove(text + len, ring, LINESIZ - len);
1536 if (++rs == end_ring)
1538 xwrite(s, text, sizeof(text));
1542 static void chargen_dg(int s, servtab_t *sep)
1545 char text[LINESIZ + 2];
1546 len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
1548 /* Eat UDP packet which started it all */
1549 /* dgram builtins are non-forking - DONT BLOCK! */
1550 lsa->len = sep->se_lsa->len;
1551 if (recvfrom(s, text, sizeof(text), MSG_DONTWAIT, &lsa->u.sa, &lsa->len) < 0)
1559 len = end_ring - ring_pos;
1561 memmove(text, ring_pos, LINESIZ);
1563 memmove(text, ring_pos, len);
1564 memmove(text + len, ring, LINESIZ - len);
1566 if (++ring_pos == end_ring)
1568 text[LINESIZ] = '\r';
1569 text[LINESIZ + 1] = '\n';
1570 sendto(s, text, sizeof(text), 0, &lsa->u.sa, lsa->len);
1572 #endif /* FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN */
1575 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME
1577 * Return a machine readable date and time, in the form of the
1578 * number of seconds since midnight, Jan 1, 1900. Since gettimeofday
1579 * returns the number of seconds since midnight, Jan 1, 1970,
1580 * we must add 2208988800 seconds to this figure to make up for
1581 * some seventy years Bell Labs was asleep.
1583 static uint32_t machtime(void)
1587 gettimeofday(&tv, NULL);
1588 return htonl((uint32_t)(tv.tv_sec + 2208988800));
1591 static void machtime_stream(int s, servtab_t *sep UNUSED_PARAM)
1595 result = machtime();
1596 full_write(s, &result, sizeof(result));
1598 static void machtime_dg(int s, servtab_t *sep)
1601 len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
1603 lsa->len = sep->se_lsa->len;
1604 if (recvfrom(s, line, LINE_SIZE, MSG_DONTWAIT, &lsa->u.sa, &lsa->len) < 0)
1607 result = machtime();
1608 sendto(s, &result, sizeof(result), 0, &lsa->u.sa, lsa->len);
1610 #endif /* FEATURE_INETD_SUPPORT_BUILTIN_TIME */
1613 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
1614 /* Return human-readable time of day */
1616 static void daytime_stream(int s, servtab_t *sep UNUSED_PARAM)
1621 fdprintf(s, "%.24s\r\n", ctime(&t));
1623 static void daytime_dg(int s, servtab_t *sep)
1626 len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
1628 lsa->len = sep->se_lsa->len;
1629 if (recvfrom(s, line, LINE_SIZE, MSG_DONTWAIT, &lsa->u.sa, &lsa->len) < 0)
1633 sprintf(line, "%.24s\r\n", ctime(&t));
1634 sendto(s, line, strlen(line), 0, &lsa->u.sa, lsa->len);
1636 #endif /* FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME */