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 ATTRIBUTE_UNUSED)
892 servtab_t *sep, *cp, **sepp;
893 len_and_sockaddr *lsa;
898 if (!reopen_config_file())
900 for (sep = serv_list; sep; sep = sep->se_next)
907 cp = parse_one_line();
911 for (sep = serv_list; sep; sep = sep->se_next)
912 if (same_serv_addr_proto(sep, cp))
914 /* not an "equal" servtab */
915 sep = insert_in_servlist(cp);
921 block_CHLD_HUP_ALRM(&omask);
922 #if ENABLE_FEATURE_INETD_RPC
923 if (is_rpc_service(sep))
925 sep->se_rpcver_lo = cp->se_rpcver_lo;
926 sep->se_rpcver_hi = cp->se_rpcver_hi;
928 if (cp->se_wait == 0) {
929 /* New config says "nowait". If old one
930 * was "wait", we currently may be waiting
931 * for a child (and not accepting connects).
932 * Stop waiting, start listening again.
933 * (if it's not true, this op is harmless) */
934 add_fd_to_set(sep->se_fd);
936 sep->se_wait = cp->se_wait;
937 sep->se_max = cp->se_max;
938 /* string fields need more love - we don't want to leak them */
939 #define SWAP(type, a, b) do { type c = (type)a; a = (type)b; b = (type)c; } while (0)
940 SWAP(char*, sep->se_user, cp->se_user);
941 SWAP(char*, sep->se_group, cp->se_group);
942 SWAP(char*, sep->se_program, cp->se_program);
943 for (i = 0; i < MAXARGV; i++)
944 SWAP(char*, sep->se_argv[i], cp->se_argv[i]);
946 restore_sigmask(&omask);
947 free_servtab_strings(cp);
950 /* cp->string_fields are consumed by insert_in_servlist()
951 * or freed at this point, cp itself is not yet freed. */
954 /* create new len_and_sockaddr */
955 switch (sep->se_family) {
956 struct sockaddr_un *sun;
958 lsa = xzalloc_lsa(AF_UNIX);
959 sun = (struct sockaddr_un*)&lsa->u.sa;
960 safe_strncpy(sun->sun_path, sep->se_service, sizeof(sun->sun_path));
963 default: /* case AF_INET, case AF_INET6 */
964 n = bb_strtou(sep->se_service, NULL, 10);
965 #if ENABLE_FEATURE_INETD_RPC
966 if (is_rpc_service(sep)) {
968 if (errno) { /* se_service is not numeric */
969 struct rpcent *rp = getrpcbyname(sep->se_service);
971 bb_error_msg("%s: unknown rpc service", sep->se_service);
974 sep->se_rpcprog = rp->r_number;
976 if (sep->se_fd == -1)
977 prepare_socket_fd(sep);
978 if (sep->se_fd != -1)
983 /* what port to listen on? */
985 if (errno || n > 0xffff) { /* se_service is not numeric */
988 /* can result only in "tcp" or "udp": */
989 safe_strncpy(protoname, sep->se_proto, 4);
990 sp = getservbyname(sep->se_service, protoname);
992 bb_error_msg("%s/%s: unknown service",
993 sep->se_service, sep->se_proto);
998 if (LONE_CHAR(sep->se_local_hostname, '*')) {
999 lsa = xzalloc_lsa(sep->se_family);
1000 set_nport(lsa, port);
1002 lsa = host_and_af2sockaddr(sep->se_local_hostname,
1003 ntohs(port), sep->se_family);
1005 bb_error_msg("%s/%s: unknown host '%s'",
1006 sep->se_service, sep->se_proto,
1007 sep->se_local_hostname);
1012 } /* end of "switch (sep->se_family)" */
1014 /* did lsa change? Then close/open */
1015 if (sep->se_lsa == NULL
1016 || lsa->len != sep->se_lsa->len
1017 || memcmp(&lsa->u.sa, &sep->se_lsa->u.sa, lsa->len) != 0
1019 remove_fd_from_set(sep->se_fd);
1020 maybe_close(sep->se_fd);
1027 if (sep->se_fd == -1)
1028 prepare_socket_fd(sep);
1033 } /* end of "while (1) parse lines" */
1034 close_config_file();
1036 /* Purge anything not looked at above - these are stale entries,
1037 * new config file doesnt have them. */
1038 block_CHLD_HUP_ALRM(&omask);
1040 while ((sep = *sepp)) {
1041 if (sep->se_checked) {
1042 sepp = &sep->se_next;
1045 *sepp = sep->se_next;
1046 remove_fd_from_set(sep->se_fd);
1047 maybe_close(sep->se_fd);
1048 #if ENABLE_FEATURE_INETD_RPC
1049 if (is_rpc_service(sep))
1050 unregister_rpc(sep);
1052 if (sep->se_family == AF_UNIX)
1053 unlink(sep->se_service);
1054 free_servtab_strings(sep);
1057 restore_sigmask(&omask);
1060 static void reap_child(int sig ATTRIBUTE_UNUSED)
1065 int save_errno = errno;
1068 pid = wait_any_nohang(&status);
1071 for (sep = serv_list; sep; sep = sep->se_next)
1072 if (sep->se_wait == pid) {
1073 /* One of our "wait" services */
1074 if (WIFEXITED(status) && WEXITSTATUS(status))
1075 bb_error_msg("%s: exit status 0x%x",
1076 sep->se_program, WEXITSTATUS(status));
1077 else if (WIFSIGNALED(status))
1078 bb_error_msg("%s: exit signal 0x%x",
1079 sep->se_program, WTERMSIG(status));
1081 add_fd_to_set(sep->se_fd);
1087 static void retry_network_setup(int sig ATTRIBUTE_UNUSED)
1092 for (sep = serv_list; sep; sep = sep->se_next) {
1093 if (sep->se_fd == -1) {
1094 prepare_socket_fd(sep);
1095 #if ENABLE_FEATURE_INETD_RPC
1096 if (sep->se_fd != -1 && is_rpc_service(sep))
1103 static void clean_up_and_exit(int sig ATTRIBUTE_UNUSED)
1107 /* XXX signal race walking sep list */
1108 for (sep = serv_list; sep; sep = sep->se_next) {
1109 if (sep->se_fd == -1)
1112 switch (sep->se_family) {
1114 unlink(sep->se_service);
1116 default: /* case AF_INET, AF_INET6 */
1117 #if ENABLE_FEATURE_INETD_RPC
1118 if (sep->se_wait == 1 && is_rpc_service(sep))
1119 unregister_rpc(sep); /* XXX signal race */
1123 if (ENABLE_FEATURE_CLEAN_UP)
1126 remove_pidfile(_PATH_INETDPID);
1130 int inetd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1131 int inetd_main(int argc ATTRIBUTE_UNUSED, char **argv)
1133 struct sigaction sa, saved_pipe_handler;
1134 servtab_t *sep, *sep2;
1136 struct group *grp = grp; /* for compiler */
1143 real_uid = getuid();
1144 if (real_uid != 0) /* run by non-root user */
1145 config_filename = NULL;
1147 opt_complementary = "R+:q+"; /* -q N, -R N */
1148 opt = getopt32(argv, "R:feq:", &max_concurrency, &global_queuelen);
1152 config_filename = argv[0];
1153 if (config_filename == NULL)
1154 bb_error_msg_and_die("non-root must specify config file");
1156 bb_daemonize_or_rexec(0, argv - optind);
1158 bb_sanitize_stdio();
1160 openlog(applet_name, LOG_PID | LOG_NOWAIT, LOG_DAEMON);
1161 logmode = LOGMODE_SYSLOG;
1164 if (real_uid == 0) {
1165 /* run by root, ensure groups vector gets trashed */
1166 gid_t gid = getgid();
1170 write_pidfile(_PATH_INETDPID);
1172 /* never fails under Linux (except if you pass it bad arguments) */
1173 getrlimit(RLIMIT_NOFILE, &rlim_ofile);
1174 rlim_ofile_cur = rlim_ofile.rlim_cur;
1175 if (rlim_ofile_cur == RLIM_INFINITY) /* ! */
1176 rlim_ofile_cur = OPEN_MAX;
1178 memset(&sa, 0, sizeof(sa));
1179 /*sigemptyset(&sa.sa_mask); - memset did it */
1180 sigaddset(&sa.sa_mask, SIGALRM);
1181 sigaddset(&sa.sa_mask, SIGCHLD);
1182 sigaddset(&sa.sa_mask, SIGHUP);
1183 sa.sa_handler = retry_network_setup;
1184 sigaction_set(SIGALRM, &sa);
1185 sa.sa_handler = reread_config_file;
1186 sigaction_set(SIGHUP, &sa);
1187 sa.sa_handler = reap_child;
1188 sigaction_set(SIGCHLD, &sa);
1189 sa.sa_handler = clean_up_and_exit;
1190 sigaction_set(SIGTERM, &sa);
1191 sa.sa_handler = clean_up_and_exit;
1192 sigaction_set(SIGINT, &sa);
1193 sa.sa_handler = SIG_IGN;
1194 sigaction(SIGPIPE, &sa, &saved_pipe_handler);
1196 reread_config_file(SIGHUP); /* load config from file */
1200 int ctrl, accepted_fd, new_udp_fd;
1204 recalculate_maxsock();
1206 readable = allsock; /* struct copy */
1207 /* if there are no fds to wait on, we will block
1208 * until signal wakes us up */
1209 ready_fd_cnt = select(maxsock + 1, &readable, NULL, NULL, NULL);
1210 if (ready_fd_cnt < 0) {
1211 if (errno != EINTR) {
1212 bb_perror_msg("select");
1218 for (sep = serv_list; ready_fd_cnt && sep; sep = sep->se_next) {
1219 if (sep->se_fd == -1 || !FD_ISSET(sep->se_fd, &readable))
1226 if (!sep->se_wait) {
1227 if (sep->se_socktype == SOCK_STREAM) {
1228 ctrl = accepted_fd = accept(sep->se_fd, NULL, NULL);
1231 bb_perror_msg("accept (for %s)", sep->se_service);
1236 if (sep->se_socktype == SOCK_DGRAM
1237 && sep->se_family != AF_UNIX
1239 /* How udp "nowait" works:
1240 * child peeks at (received and buffered by kernel) UDP packet,
1241 * performs connect() on the socket so that it is linked only
1242 * to this peer. But this also affects parent, because descriptors
1243 * are shared after fork() a-la dup(). When parent performs
1244 * select(), it will see this descriptor connected to the peer (!)
1245 * and still readable, will act on it and mess things up
1246 * (can create many copies of same child, etc).
1247 * Parent must create and use new socket instead. */
1248 new_udp_fd = socket(sep->se_family, SOCK_DGRAM, 0);
1249 if (new_udp_fd < 0) { /* error: eat packet, forget about it */
1251 recv(sep->se_fd, line, LINE_SIZE, MSG_DONTWAIT);
1254 setsockopt_reuseaddr(new_udp_fd);
1255 /* TODO: better do bind after vfork in parent,
1256 * so that we don't have two wildcard bound sockets
1257 * even for a brief moment? */
1258 if (bind(new_udp_fd, &sep->se_lsa->u.sa, sep->se_lsa->len) < 0) {
1265 block_CHLD_HUP_ALRM(&omask);
1267 #ifdef INETD_BUILTINS_ENABLED
1268 /* do we need to fork? */
1269 if (sep->se_builtin == NULL
1270 || (sep->se_socktype == SOCK_STREAM
1271 && sep->se_builtin->bi_fork))
1274 if (sep->se_max != 0) {
1275 if (++sep->se_count == 1)
1276 sep->se_time = monotonic_sec();
1277 else if (sep->se_count >= sep->se_max) {
1278 unsigned now = monotonic_sec();
1279 /* did we accumulate se_max connects too quickly? */
1280 if (now - sep->se_time <= CNT_INTERVAL) {
1281 bb_error_msg("%s/%s: too many connections, pausing",
1282 sep->se_service, sep->se_proto);
1283 remove_fd_from_set(sep->se_fd);
1287 rearm_alarm(); /* will revive it in RETRYTIME sec */
1288 restore_sigmask(&omask);
1289 maybe_close(accepted_fd);
1290 continue; /* -> check next fd in fd set */
1295 /* on NOMMU, streamed chargen
1296 * builtin wouldn't work, but it is
1297 * not allowed on NOMMU (ifdefed out) */
1298 #ifdef INETD_BUILTINS_ENABLED
1299 if (BB_MMU && sep->se_builtin)
1305 if (pid < 0) { /* fork error */
1306 bb_perror_msg("fork");
1308 restore_sigmask(&omask);
1309 maybe_close(accepted_fd);
1310 continue; /* -> check next fd in fd set */
1313 pid--; /* -1: "we did fork and we are child" */
1315 /* if pid == 0 here, we never forked */
1317 if (pid > 0) { /* parent */
1319 /* tcp wait: we passed listening socket to child,
1320 * will wait for child to terminate */
1322 remove_fd_from_set(sep->se_fd);
1324 if (new_udp_fd >= 0) {
1325 /* udp nowait: child connected the socket,
1326 * we created and will use new, unconnected one */
1327 xmove_fd(new_udp_fd, sep->se_fd);
1329 restore_sigmask(&omask);
1330 maybe_close(accepted_fd);
1331 continue; /* -> check next fd in fd set */
1334 /* we are either child or didn't vfork at all */
1335 #ifdef INETD_BUILTINS_ENABLED
1336 if (sep->se_builtin) {
1337 if (pid) { /* "pid" is -1: we did vfork */
1338 close(sep->se_fd); /* listening socket */
1339 logmode = 0; /* make xwrite etc silent */
1341 restore_sigmask(&omask);
1342 if (sep->se_socktype == SOCK_STREAM)
1343 sep->se_builtin->bi_stream_fn(ctrl, sep);
1345 sep->se_builtin->bi_dgram_fn(ctrl, sep);
1346 if (pid) /* we did vfork */
1347 _exit(EXIT_FAILURE);
1348 maybe_close(accepted_fd);
1349 continue; /* -> check next fd in fd set */
1355 if (new_udp_fd >= 0) {
1356 len_and_sockaddr *lsa = xzalloc_lsa(sep->se_family);
1357 /* peek at the packet and remember peer addr */
1358 int r = recvfrom(ctrl, NULL, 0, MSG_PEEK|MSG_DONTWAIT,
1359 &lsa->u.sa, &lsa->len);
1362 /* make this socket "connected" to peer addr:
1363 * only packets from this peer will be recv'ed,
1364 * and bare write()/send() will work on it */
1365 connect(ctrl, &lsa->u.sa, lsa->len);
1368 /* prepare env and exec program */
1369 pwd = getpwnam(sep->se_user);
1371 bb_error_msg("%s: no such user", sep->se_user);
1374 if (sep->se_group && (grp = getgrnam(sep->se_group)) == NULL) {
1375 bb_error_msg("%s: no such group", sep->se_group);
1378 if (real_uid != 0 && real_uid != pwd->pw_uid) {
1379 /* a user running private inetd */
1380 bb_error_msg("non-root must run services as himself");
1385 pwd->pw_gid = grp->gr_gid;
1386 /* initgroups, setgid, setuid: */
1387 change_identity(pwd);
1388 } else if (sep->se_group) {
1389 xsetgid(grp->gr_gid);
1390 setgroups(1, &grp->gr_gid);
1392 if (rlim_ofile.rlim_cur != rlim_ofile_cur)
1393 if (setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0)
1394 bb_perror_msg("setrlimit");
1399 /* NB: among others, this loop closes listening socket
1400 * for nowait stream children */
1401 for (sep2 = serv_list; sep2; sep2 = sep2->se_next)
1402 maybe_close(sep2->se_fd);
1403 sigaction_set(SIGPIPE, &saved_pipe_handler);
1404 restore_sigmask(&omask);
1405 BB_EXECVP(sep->se_program, sep->se_argv);
1406 bb_perror_msg("exec %s", sep->se_program);
1408 /* eat packet in udp case */
1409 if (sep->se_socktype != SOCK_STREAM)
1410 recv(0, line, LINE_SIZE, MSG_DONTWAIT);
1411 _exit(EXIT_FAILURE);
1412 } /* for (sep = servtab...) */
1417 static const char *const cat_args[] = { "cat", NULL };
1421 * Internet services provided internally by inetd:
1423 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
1424 /* Echo service -- echo data back. */
1426 static void echo_stream(int s, servtab_t *sep ATTRIBUTE_UNUSED)
1430 ssize_t sz = safe_read(s, line, LINE_SIZE);
1433 xwrite(s, line, sz);
1436 /* We are after vfork here! */
1437 /* move network socket to stdin/stdout */
1438 xmove_fd(s, STDIN_FILENO);
1439 xdup2(STDIN_FILENO, STDOUT_FILENO);
1440 /* no error messages please... */
1441 close(STDERR_FILENO);
1442 xopen("/dev/null", O_WRONLY);
1443 BB_EXECVP("cat", (char**)cat_args);
1444 /* on failure we return to main, which does exit(EXIT_FAILURE) */
1447 static void echo_dg(int s, servtab_t *sep)
1449 enum { BUFSIZE = 12*1024 }; /* for jumbo sized packets! :) */
1450 char *buf = xmalloc(BUFSIZE); /* too big for stack */
1452 len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
1454 lsa->len = sep->se_lsa->len;
1455 /* dgram builtins are non-forking - DONT BLOCK! */
1456 sz = recvfrom(s, buf, BUFSIZE, MSG_DONTWAIT, &lsa->u.sa, &lsa->len);
1458 sendto(s, buf, sz, 0, &lsa->u.sa, lsa->len);
1461 #endif /* FEATURE_INETD_SUPPORT_BUILTIN_ECHO */
1464 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
1465 /* Discard service -- ignore data. MMU arches only. */
1467 static void discard_stream(int s, servtab_t *sep ATTRIBUTE_UNUSED)
1470 while (safe_read(s, line, LINE_SIZE) > 0)
1473 /* We are after vfork here! */
1474 /* move network socket to stdin */
1475 xmove_fd(s, STDIN_FILENO);
1476 /* discard output */
1477 close(STDOUT_FILENO);
1478 xopen("/dev/null", O_WRONLY);
1479 /* no error messages please... */
1480 xdup2(STDOUT_FILENO, STDERR_FILENO);
1481 BB_EXECVP("cat", (char**)cat_args);
1482 /* on failure we return to main, which does exit(EXIT_FAILURE) */
1486 static void discard_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
1488 /* dgram builtins are non-forking - DONT BLOCK! */
1489 recv(s, line, LINE_SIZE, MSG_DONTWAIT);
1491 #endif /* FEATURE_INETD_SUPPORT_BUILTIN_DISCARD */
1494 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
1496 static void init_ring(void)
1501 for (i = 0; i <= 128; ++i)
1505 /* Character generator. MMU arches only. */
1507 static void chargen_stream(int s, servtab_t *sep ATTRIBUTE_UNUSED)
1511 char text[LINESIZ + 2];
1518 text[LINESIZ] = '\r';
1519 text[LINESIZ + 1] = '\n';
1522 len = end_ring - rs;
1524 memmove(text, rs, LINESIZ);
1526 memmove(text, rs, len);
1527 memmove(text + len, ring, LINESIZ - len);
1529 if (++rs == end_ring)
1531 xwrite(s, text, sizeof(text));
1535 static void chargen_dg(int s, servtab_t *sep)
1538 char text[LINESIZ + 2];
1539 len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
1541 /* Eat UDP packet which started it all */
1542 /* dgram builtins are non-forking - DONT BLOCK! */
1543 lsa->len = sep->se_lsa->len;
1544 if (recvfrom(s, text, sizeof(text), MSG_DONTWAIT, &lsa->u.sa, &lsa->len) < 0)
1552 len = end_ring - ring_pos;
1554 memmove(text, ring_pos, LINESIZ);
1556 memmove(text, ring_pos, len);
1557 memmove(text + len, ring, LINESIZ - len);
1559 if (++ring_pos == end_ring)
1561 text[LINESIZ] = '\r';
1562 text[LINESIZ + 1] = '\n';
1563 sendto(s, text, sizeof(text), 0, &lsa->u.sa, lsa->len);
1565 #endif /* FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN */
1568 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME
1570 * Return a machine readable date and time, in the form of the
1571 * number of seconds since midnight, Jan 1, 1900. Since gettimeofday
1572 * returns the number of seconds since midnight, Jan 1, 1970,
1573 * we must add 2208988800 seconds to this figure to make up for
1574 * some seventy years Bell Labs was asleep.
1576 static uint32_t machtime(void)
1580 gettimeofday(&tv, NULL);
1581 return htonl((uint32_t)(tv.tv_sec + 2208988800));
1584 static void machtime_stream(int s, servtab_t *sep ATTRIBUTE_UNUSED)
1588 result = machtime();
1589 full_write(s, &result, sizeof(result));
1591 static void machtime_dg(int s, servtab_t *sep)
1594 len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
1596 lsa->len = sep->se_lsa->len;
1597 if (recvfrom(s, line, LINE_SIZE, MSG_DONTWAIT, &lsa->u.sa, &lsa->len) < 0)
1600 result = machtime();
1601 sendto(s, &result, sizeof(result), 0, &lsa->u.sa, lsa->len);
1603 #endif /* FEATURE_INETD_SUPPORT_BUILTIN_TIME */
1606 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
1607 /* Return human-readable time of day */
1609 static void daytime_stream(int s, servtab_t *sep ATTRIBUTE_UNUSED)
1614 fdprintf(s, "%.24s\r\n", ctime(&t));
1616 static void daytime_dg(int s, servtab_t *sep)
1619 len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
1621 lsa->len = sep->se_lsa->len;
1622 if (recvfrom(s, line, LINE_SIZE, MSG_DONTWAIT, &lsa->u.sa, &lsa->len) < 0)
1626 sprintf(line, "%.24s\r\n", ctime(&t));
1627 sendto(s, line, strlen(line), 0, &lsa->u.sa, lsa->len);
1629 #endif /* FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME */