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)
157 //usage:#define inetd_trivial_usage
158 //usage: "[-fe] [-q N] [-R N] [CONFFILE]"
159 //usage:#define inetd_full_usage "\n\n"
160 //usage: "Listen for network connections and launch programs\n"
161 //usage: "\nOptions:"
162 //usage: "\n -f Run in foreground"
163 //usage: "\n -e Log to stderr"
164 //usage: "\n -q N Socket listen queue (default: 128)"
165 //usage: "\n -R N Pause services after N connects/min"
166 //usage: "\n (default: 0 - disabled)"
173 #if ENABLE_FEATURE_INETD_RPC
175 #include <rpc/pmap_clnt.h>
179 /* stream version of chargen is forking but not execing,
180 * can't do that (easily) on NOMMU */
181 #undef ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
182 #define ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN 0
185 #define _PATH_INETDPID "/var/run/inetd.pid"
187 #define CNT_INTERVAL 60 /* servers in CNT_INTERVAL sec. */
188 #define RETRYTIME 60 /* retry after bind or server fail */
190 // TODO: explain, or get rid of setrlimit games
192 #ifndef RLIMIT_NOFILE
193 #define RLIMIT_NOFILE RLIMIT_OFILE
200 /* Reserve some descriptors, 3 stdio + at least: 1 log, 1 conf. file */
203 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD \
204 || ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO \
205 || ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN \
206 || ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME \
207 || ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
208 # define INETD_BUILTINS_ENABLED
211 typedef struct servtab_t {
212 /* The most frequently referenced one: */
213 int se_fd; /* open descriptor */
214 /* NB: 'biggest fields last' saves on code size (~250 bytes) */
215 /* [addr:]service socktype proto wait user[:group] prog [args] */
216 char *se_local_hostname; /* addr to listen on */
217 char *se_service; /* "80" or "www" or "mount/2[-3]" */
218 /* socktype is in se_socktype */ /* "stream" "dgram" "raw" "rdm" "seqpacket" */
219 char *se_proto; /* "unix" or "[rpc/]tcp[6]" */
220 #if ENABLE_FEATURE_INETD_RPC
221 int se_rpcprog; /* rpc program number */
222 int se_rpcver_lo; /* rpc program lowest version */
223 int se_rpcver_hi; /* rpc program highest version */
224 #define is_rpc_service(sep) ((sep)->se_rpcver_lo != 0)
226 #define is_rpc_service(sep) 0
228 pid_t se_wait; /* 0:"nowait", 1:"wait", >1:"wait" */
229 /* and waiting for this pid */
230 socktype_t se_socktype; /* SOCK_STREAM/DGRAM/RDM/... */
231 family_t se_family; /* AF_UNIX/INET[6] */
232 /* se_proto_no is used by RPC code only... hmm */
233 smallint se_proto_no; /* IPPROTO_TCP/UDP, n/a for AF_UNIX */
234 smallint se_checked; /* looked at during merge */
235 unsigned se_max; /* allowed instances per minute */
236 unsigned se_count; /* number started since se_time */
237 unsigned se_time; /* when we started counting */
238 char *se_user; /* user name to run as */
239 char *se_group; /* group name to run as, can be NULL */
240 #ifdef INETD_BUILTINS_ENABLED
241 const struct builtin *se_builtin; /* if built-in, description */
243 struct servtab_t *se_next;
244 len_and_sockaddr *se_lsa;
245 char *se_program; /* server program */
247 char *se_argv[MAXARGV + 1]; /* program arguments */
250 #ifdef INETD_BUILTINS_ENABLED
251 /* Echo received data */
252 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
253 static void FAST_FUNC echo_stream(int, servtab_t *);
254 static void FAST_FUNC echo_dg(int, servtab_t *);
256 /* Internet /dev/null */
257 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
258 static void FAST_FUNC discard_stream(int, servtab_t *);
259 static void FAST_FUNC discard_dg(int, servtab_t *);
261 /* Return 32 bit time since 1900 */
262 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME
263 static void FAST_FUNC machtime_stream(int, servtab_t *);
264 static void FAST_FUNC machtime_dg(int, servtab_t *);
266 /* Return human-readable time */
267 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
268 static void FAST_FUNC daytime_stream(int, servtab_t *);
269 static void FAST_FUNC daytime_dg(int, servtab_t *);
271 /* Familiar character generator */
272 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
273 static void FAST_FUNC chargen_stream(int, servtab_t *);
274 static void FAST_FUNC chargen_dg(int, servtab_t *);
278 /* NB: not necessarily NUL terminated */
279 char bi_service7[7]; /* internally provided service name */
280 uint8_t bi_fork; /* 1 if stream fn should run in child */
281 void (*bi_stream_fn)(int, servtab_t *) FAST_FUNC;
282 void (*bi_dgram_fn)(int, servtab_t *) FAST_FUNC;
285 static const struct builtin builtins[] = {
286 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
287 { "echo", 1, echo_stream, echo_dg },
289 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
290 { "discard", 1, discard_stream, discard_dg },
292 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
293 { "chargen", 1, chargen_stream, chargen_dg },
295 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME
296 { "time", 0, machtime_stream, machtime_dg },
298 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
299 { "daytime", 0, daytime_stream, daytime_dg },
302 #endif /* INETD_BUILTINS_ENABLED */
305 rlim_t rlim_ofile_cur;
306 struct rlimit rlim_ofile;
307 servtab_t *serv_list;
309 int maxsock; /* max fd# in allsock, -1: unknown */
310 /* whenever maxsock grows, prev_maxsock is set to new maxsock,
311 * but if maxsock is set to -1, prev_maxsock is not changed */
313 unsigned max_concurrency;
314 smallint alarm_armed;
315 uid_t real_uid; /* user ID who ran us */
316 const char *config_filename;
318 char *default_local_hostname;
319 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
325 /* Used in next_line(), and as scratch read buffer */
326 char line[256]; /* _at least_ 256, see LINE_SIZE */
328 #define G (*(struct globals*)&bb_common_bufsiz1)
329 enum { LINE_SIZE = COMMON_BUFSIZE - offsetof(struct globals, line) };
330 struct BUG_G_too_big {
331 char BUG_G_too_big[sizeof(G) <= COMMON_BUFSIZE ? 1 : -1];
333 #define rlim_ofile_cur (G.rlim_ofile_cur )
334 #define rlim_ofile (G.rlim_ofile )
335 #define serv_list (G.serv_list )
336 #define global_queuelen (G.global_queuelen)
337 #define maxsock (G.maxsock )
338 #define prev_maxsock (G.prev_maxsock )
339 #define max_concurrency (G.max_concurrency)
340 #define alarm_armed (G.alarm_armed )
341 #define real_uid (G.real_uid )
342 #define config_filename (G.config_filename)
343 #define parser (G.parser )
344 #define default_local_hostname (G.default_local_hostname)
345 #define first_ps_byte (G.first_ps_byte )
346 #define last_ps_byte (G.last_ps_byte )
347 #define end_ring (G.end_ring )
348 #define ring_pos (G.ring_pos )
349 #define ring (G.ring )
350 #define allsock (G.allsock )
351 #define line (G.line )
352 #define INIT_G() do { \
353 rlim_ofile_cur = OPEN_MAX; \
354 global_queuelen = 128; \
355 config_filename = "/etc/inetd.conf"; \
358 static void maybe_close(int fd)
364 // TODO: move to libbb?
365 static len_and_sockaddr *xzalloc_lsa(int family)
367 len_and_sockaddr *lsa;
370 sz = sizeof(struct sockaddr_in);
371 if (family == AF_UNIX)
372 sz = sizeof(struct sockaddr_un);
373 #if ENABLE_FEATURE_IPV6
374 if (family == AF_INET6)
375 sz = sizeof(struct sockaddr_in6);
377 lsa = xzalloc(LSA_LEN_SIZE + sz);
379 lsa->u.sa.sa_family = family;
383 static void rearm_alarm(void)
391 static void block_CHLD_HUP_ALRM(sigset_t *m)
394 sigaddset(m, SIGCHLD);
395 sigaddset(m, SIGHUP);
396 sigaddset(m, SIGALRM);
397 sigprocmask(SIG_BLOCK, m, m); /* old sigmask is stored in m */
400 static void restore_sigmask(sigset_t *m)
402 sigprocmask(SIG_SETMASK, m, NULL);
405 #if ENABLE_FEATURE_INETD_RPC
406 static void register_rpc(servtab_t *sep)
409 struct sockaddr_in ir_sin;
412 size = sizeof(ir_sin);
413 if (getsockname(sep->se_fd, (struct sockaddr *) &ir_sin, &size) < 0) {
414 bb_perror_msg("getsockname");
418 for (n = sep->se_rpcver_lo; n <= sep->se_rpcver_hi; n++) {
419 pmap_unset(sep->se_rpcprog, n);
420 if (!pmap_set(sep->se_rpcprog, n, sep->se_proto_no, ntohs(ir_sin.sin_port)))
421 bb_perror_msg("%s %s: pmap_set(%u,%u,%u,%u)",
422 sep->se_service, sep->se_proto,
423 sep->se_rpcprog, n, sep->se_proto_no, ntohs(ir_sin.sin_port));
427 static void unregister_rpc(servtab_t *sep)
431 for (n = sep->se_rpcver_lo; n <= sep->se_rpcver_hi; n++) {
432 if (!pmap_unset(sep->se_rpcprog, n))
433 bb_perror_msg("pmap_unset(%u,%u)", sep->se_rpcprog, n);
436 #endif /* FEATURE_INETD_RPC */
438 static void bump_nofile(void)
440 enum { FD_CHUNK = 32 };
443 /* Never fails under Linux (except if you pass it bad arguments) */
444 getrlimit(RLIMIT_NOFILE, &rl);
445 rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK);
446 rl.rlim_cur = MIN(FD_SETSIZE, rl.rlim_cur + FD_CHUNK);
447 if (rl.rlim_cur <= rlim_ofile_cur) {
448 bb_error_msg("can't extend file limit, max = %d",
453 if (setrlimit(RLIMIT_NOFILE, &rl) < 0) {
454 bb_perror_msg("setrlimit");
458 rlim_ofile_cur = rl.rlim_cur;
461 static void remove_fd_from_set(int fd)
464 FD_CLR(fd, &allsock);
469 static void add_fd_to_set(int fd)
472 FD_SET(fd, &allsock);
473 if (maxsock >= 0 && fd > maxsock) {
474 prev_maxsock = maxsock = fd;
475 if ((rlim_t)fd > rlim_ofile_cur - FD_MARGIN)
481 static void recalculate_maxsock(void)
485 /* We may have no services, in this case maxsock should still be >= 0
486 * (code elsewhere is not happy with maxsock == -1) */
488 while (fd <= prev_maxsock) {
489 if (FD_ISSET(fd, &allsock))
493 prev_maxsock = maxsock;
494 if ((rlim_t)maxsock > rlim_ofile_cur - FD_MARGIN)
498 static void prepare_socket_fd(servtab_t *sep)
502 fd = socket(sep->se_family, sep->se_socktype, 0);
504 bb_perror_msg("socket");
507 setsockopt_reuseaddr(fd);
509 #if ENABLE_FEATURE_INETD_RPC
510 if (is_rpc_service(sep)) {
513 /* zero out the port for all RPC services; let bind()
515 set_nport(&sep->se_lsa->u.sa, 0);
517 /* for RPC services, attempt to use a reserved port
518 * if they are going to be running as root. */
519 if (real_uid == 0 && sep->se_family == AF_INET
520 && (pwd = getpwnam(sep->se_user)) != NULL
523 r = bindresvport(fd, &sep->se_lsa->u.sin);
525 r = bind(fd, &sep->se_lsa->u.sa, sep->se_lsa->len);
528 int saveerrno = errno;
529 /* update lsa with port# */
530 getsockname(fd, &sep->se_lsa->u.sa, &sep->se_lsa->len);
536 if (sep->se_family == AF_UNIX) {
537 struct sockaddr_un *sun;
538 sun = (struct sockaddr_un*)&(sep->se_lsa->u.sa);
539 unlink(sun->sun_path);
541 r = bind(fd, &sep->se_lsa->u.sa, sep->se_lsa->len);
544 bb_perror_msg("%s/%s: bind",
545 sep->se_service, sep->se_proto);
550 if (sep->se_socktype == SOCK_STREAM)
551 listen(fd, global_queuelen);
557 static int reopen_config_file(void)
559 free(default_local_hostname);
560 default_local_hostname = xstrdup("*");
562 config_close(parser);
563 parser = config_open(config_filename);
564 return (parser != NULL);
567 static void close_config_file(void)
570 config_close(parser);
575 static void free_servtab_strings(servtab_t *cp)
579 free(cp->se_local_hostname);
580 free(cp->se_service);
584 free(cp->se_lsa); /* not a string in fact */
585 free(cp->se_program);
586 for (i = 0; i < MAXARGV; i++)
587 free(cp->se_argv[i]);
590 static servtab_t *new_servtab(void)
592 servtab_t *newtab = xzalloc(sizeof(servtab_t));
593 newtab->se_fd = -1; /* paranoia */
597 static servtab_t *dup_servtab(servtab_t *sep)
602 newtab = new_servtab();
603 *newtab = *sep; /* struct copy */
604 /* deep-copying strings */
605 newtab->se_service = xstrdup(newtab->se_service);
606 newtab->se_proto = xstrdup(newtab->se_proto);
607 newtab->se_user = xstrdup(newtab->se_user);
608 newtab->se_group = xstrdup(newtab->se_group);
609 newtab->se_program = xstrdup(newtab->se_program);
610 for (argc = 0; argc <= MAXARGV; argc++)
611 newtab->se_argv[argc] = xstrdup(newtab->se_argv[argc]);
612 /* NB: se_fd, se_hostaddr and se_next are always
613 * overwrittend by callers, so we don't bother resetting them
614 * to NULL/0/-1 etc */
619 /* gcc generates much more code if this is inlined */
620 static servtab_t *parse_one_line(void)
623 char *token[6+MAXARGV];
631 argc = config_read(parser, token, 6+MAXARGV, 1, "# \t", PARSE_NORMAL);
637 /* [host:]service socktype proto wait user[:group] prog [args] */
638 /* Check for "host:...." line */
640 hostdelim = strrchr(arg, ':');
643 sep->se_local_hostname = xstrdup(arg);
645 if (*arg == '\0' && argc == 1) {
646 /* Line has just "host:", change the
647 * default host for the following lines. */
648 free(default_local_hostname);
649 default_local_hostname = sep->se_local_hostname;
653 sep->se_local_hostname = xstrdup(default_local_hostname);
655 /* service socktype proto wait user[:group] prog [args] */
656 sep->se_service = xstrdup(arg);
658 /* socktype proto wait user[:group] prog [args] */
661 bb_error_msg("parse error on line %u, line is ignored",
663 free_servtab_strings(sep);
664 /* Just "goto more" can make sep to carry over e.g.
665 * "rpc"-ness (by having se_rpcver_lo != 0).
666 * We will be more paranoid: */
672 static const int8_t SOCK_xxx[] ALIGN1 = {
674 SOCK_STREAM, SOCK_DGRAM, SOCK_RDM,
675 SOCK_SEQPACKET, SOCK_RAW
677 sep->se_socktype = SOCK_xxx[1 + index_in_strings(
678 "stream""\0" "dgram""\0" "rdm""\0"
679 "seqpacket""\0" "raw""\0"
683 /* {unix,[rpc/]{tcp,udp}[6]} wait user[:group] prog [args] */
684 sep->se_proto = arg = xstrdup(token[2]);
685 if (strcmp(arg, "unix") == 0) {
686 sep->se_family = AF_UNIX;
689 sep->se_family = AF_INET;
690 six = last_char_is(arg, '6');
692 #if ENABLE_FEATURE_IPV6
694 sep->se_family = AF_INET6;
696 bb_error_msg("%s: no support for IPv6", sep->se_proto);
700 if (strncmp(arg, "rpc/", 4) == 0) {
701 #if ENABLE_FEATURE_INETD_RPC
704 p = strchr(sep->se_service, '/');
706 bb_error_msg("no rpc version: '%s'", sep->se_service);
710 n = bb_strtou(p, &p, 10);
713 bb_error_msg("bad rpc version");
716 sep->se_rpcver_lo = sep->se_rpcver_hi = n;
719 n = bb_strtou(p, &p, 10);
720 if (n > INT_MAX || (int)n < sep->se_rpcver_lo)
722 sep->se_rpcver_hi = n;
727 bb_error_msg("no support for rpc services");
731 /* we don't really need getprotobyname()! */
732 if (strcmp(arg, "tcp") == 0)
733 sep->se_proto_no = IPPROTO_TCP; /* = 6 */
734 if (strcmp(arg, "udp") == 0)
735 sep->se_proto_no = IPPROTO_UDP; /* = 17 */
738 if (!sep->se_proto_no) /* not tcp/udp?? */
742 /* [no]wait[.max] user[:group] prog [args] */
744 sep->se_max = max_concurrency;
745 p = strchr(arg, '.');
748 sep->se_max = bb_strtou(p, NULL, 10);
752 sep->se_wait = (arg[0] != 'n' || arg[1] != 'o');
753 if (!sep->se_wait) /* "no" seen */
755 if (strcmp(arg, "wait") != 0)
758 /* user[:group] prog [args] */
759 sep->se_user = xstrdup(token[4]);
760 arg = strchr(sep->se_user, '.');
762 arg = strchr(sep->se_user, ':');
765 sep->se_group = xstrdup(arg);
769 sep->se_program = xstrdup(token[5]);
770 #ifdef INETD_BUILTINS_ENABLED
771 if (strcmp(sep->se_program, "internal") == 0
772 && strlen(sep->se_service) <= 7
773 && (sep->se_socktype == SOCK_STREAM
774 || sep->se_socktype == SOCK_DGRAM)
777 for (i = 0; i < ARRAY_SIZE(builtins); i++)
778 if (strncmp(builtins[i].bi_service7, sep->se_service, 7) == 0)
780 bb_error_msg("unknown internal service %s", sep->se_service);
783 sep->se_builtin = &builtins[i];
784 /* stream builtins must be "nowait", dgram must be "wait" */
785 if (sep->se_wait != (sep->se_socktype == SOCK_DGRAM))
790 while ((arg = token[6+argc]) != NULL && argc < MAXARGV)
791 sep->se_argv[argc++] = xstrdup(arg);
792 /* Some inetd.conf files have no argv's, not even argv[0].
794 * (Technically, programs can be execed with argv[0] = NULL,
795 * but many programs do not like that at all) */
797 sep->se_argv[0] = xstrdup(sep->se_program);
799 /* catch mixups. "<service> stream udp ..." == wtf */
800 if (sep->se_socktype == SOCK_STREAM) {
801 if (sep->se_proto_no == IPPROTO_UDP)
804 if (sep->se_socktype == SOCK_DGRAM) {
805 if (sep->se_proto_no == IPPROTO_TCP)
810 // "ENTRY[%s][%s][%s][%d][%d][%d][%d][%d][%s][%s][%s]",
811 // sep->se_local_hostname, sep->se_service, sep->se_proto, sep->se_wait, sep->se_proto_no,
812 // sep->se_max, sep->se_count, sep->se_time, sep->se_user, sep->se_group, sep->se_program);
814 /* check if the hostname specifier is a comma separated list
815 * of hostnames. we'll make new entries for each address. */
816 while ((hostdelim = strrchr(sep->se_local_hostname, ',')) != NULL) {
817 nsep = dup_servtab(sep);
818 /* NUL terminate the hostname field of the existing entry,
819 * and make a dup for the new entry. */
821 nsep->se_local_hostname = xstrdup(hostdelim);
822 nsep->se_next = sep->se_next;
826 /* was doing it here: */
827 /* DNS resolution, create copies for each IP address */
828 /* IPv6-ization destroyed it :( */
833 static servtab_t *insert_in_servlist(servtab_t *cp)
839 *sep = *cp; /* struct copy */
841 #if ENABLE_FEATURE_INETD_RPC
842 sep->se_rpcprog = -1;
844 block_CHLD_HUP_ALRM(&omask);
845 sep->se_next = serv_list;
847 restore_sigmask(&omask);
851 static int same_serv_addr_proto(servtab_t *old, servtab_t *new)
853 if (strcmp(old->se_local_hostname, new->se_local_hostname) != 0)
855 if (strcmp(old->se_service, new->se_service) != 0)
857 if (strcmp(old->se_proto, new->se_proto) != 0)
862 static void reread_config_file(int sig UNUSED_PARAM)
864 servtab_t *sep, *cp, **sepp;
865 len_and_sockaddr *lsa;
869 int save_errno = errno;
871 if (!reopen_config_file())
873 for (sep = serv_list; sep; sep = sep->se_next)
880 cp = parse_one_line();
884 for (sep = serv_list; sep; sep = sep->se_next)
885 if (same_serv_addr_proto(sep, cp))
887 /* not an "equal" servtab */
888 sep = insert_in_servlist(cp);
894 block_CHLD_HUP_ALRM(&omask);
895 #if ENABLE_FEATURE_INETD_RPC
896 if (is_rpc_service(sep))
898 sep->se_rpcver_lo = cp->se_rpcver_lo;
899 sep->se_rpcver_hi = cp->se_rpcver_hi;
901 if (cp->se_wait == 0) {
902 /* New config says "nowait". If old one
903 * was "wait", we currently may be waiting
904 * for a child (and not accepting connects).
905 * Stop waiting, start listening again.
906 * (if it's not true, this op is harmless) */
907 add_fd_to_set(sep->se_fd);
909 sep->se_wait = cp->se_wait;
910 sep->se_max = cp->se_max;
911 /* string fields need more love - we don't want to leak them */
912 #define SWAP(type, a, b) do { type c = (type)a; a = (type)b; b = (type)c; } while (0)
913 SWAP(char*, sep->se_user, cp->se_user);
914 SWAP(char*, sep->se_group, cp->se_group);
915 SWAP(char*, sep->se_program, cp->se_program);
916 for (i = 0; i < MAXARGV; i++)
917 SWAP(char*, sep->se_argv[i], cp->se_argv[i]);
919 restore_sigmask(&omask);
920 free_servtab_strings(cp);
923 /* cp->string_fields are consumed by insert_in_servlist()
924 * or freed at this point, cp itself is not yet freed. */
927 /* create new len_and_sockaddr */
928 switch (sep->se_family) {
929 struct sockaddr_un *sun;
931 lsa = xzalloc_lsa(AF_UNIX);
932 sun = (struct sockaddr_un*)&lsa->u.sa;
933 safe_strncpy(sun->sun_path, sep->se_service, sizeof(sun->sun_path));
936 default: /* case AF_INET, case AF_INET6 */
937 n = bb_strtou(sep->se_service, NULL, 10);
938 #if ENABLE_FEATURE_INETD_RPC
939 if (is_rpc_service(sep)) {
941 if (errno) { /* se_service is not numeric */
942 struct rpcent *rp = getrpcbyname(sep->se_service);
944 bb_error_msg("%s: unknown rpc service", sep->se_service);
947 sep->se_rpcprog = rp->r_number;
949 if (sep->se_fd == -1)
950 prepare_socket_fd(sep);
951 if (sep->se_fd != -1)
956 /* what port to listen on? */
958 if (errno || n > 0xffff) { /* se_service is not numeric */
961 /* can result only in "tcp" or "udp": */
962 safe_strncpy(protoname, sep->se_proto, 4);
963 sp = getservbyname(sep->se_service, protoname);
965 bb_error_msg("%s/%s: unknown service",
966 sep->se_service, sep->se_proto);
971 if (LONE_CHAR(sep->se_local_hostname, '*')) {
972 lsa = xzalloc_lsa(sep->se_family);
973 set_nport(&lsa->u.sa, port);
975 lsa = host_and_af2sockaddr(sep->se_local_hostname,
976 ntohs(port), sep->se_family);
978 bb_error_msg("%s/%s: unknown host '%s'",
979 sep->se_service, sep->se_proto,
980 sep->se_local_hostname);
985 } /* end of "switch (sep->se_family)" */
987 /* did lsa change? Then close/open */
988 if (sep->se_lsa == NULL
989 || lsa->len != sep->se_lsa->len
990 || memcmp(&lsa->u.sa, &sep->se_lsa->u.sa, lsa->len) != 0
992 remove_fd_from_set(sep->se_fd);
993 maybe_close(sep->se_fd);
1000 if (sep->se_fd == -1)
1001 prepare_socket_fd(sep);
1006 } /* end of "while (1) parse lines" */
1007 close_config_file();
1009 /* Purge anything not looked at above - these are stale entries,
1010 * new config file doesnt have them. */
1011 block_CHLD_HUP_ALRM(&omask);
1013 while ((sep = *sepp)) {
1014 if (sep->se_checked) {
1015 sepp = &sep->se_next;
1018 *sepp = sep->se_next;
1019 remove_fd_from_set(sep->se_fd);
1020 maybe_close(sep->se_fd);
1021 #if ENABLE_FEATURE_INETD_RPC
1022 if (is_rpc_service(sep))
1023 unregister_rpc(sep);
1025 if (sep->se_family == AF_UNIX)
1026 unlink(sep->se_service);
1027 free_servtab_strings(sep);
1030 restore_sigmask(&omask);
1035 static void reap_child(int sig UNUSED_PARAM)
1040 int save_errno = errno;
1043 pid = wait_any_nohang(&status);
1046 for (sep = serv_list; sep; sep = sep->se_next) {
1047 if (sep->se_wait != pid)
1049 /* One of our "wait" services */
1050 if (WIFEXITED(status) && WEXITSTATUS(status))
1051 bb_error_msg("%s: exit status %u",
1052 sep->se_program, WEXITSTATUS(status));
1053 else if (WIFSIGNALED(status))
1054 bb_error_msg("%s: exit signal %u",
1055 sep->se_program, WTERMSIG(status));
1057 add_fd_to_set(sep->se_fd);
1064 static void retry_network_setup(int sig UNUSED_PARAM)
1066 int save_errno = errno;
1070 for (sep = serv_list; sep; sep = sep->se_next) {
1071 if (sep->se_fd == -1) {
1072 prepare_socket_fd(sep);
1073 #if ENABLE_FEATURE_INETD_RPC
1074 if (sep->se_fd != -1 && is_rpc_service(sep))
1082 static void clean_up_and_exit(int sig UNUSED_PARAM)
1086 /* XXX signal race walking sep list */
1087 for (sep = serv_list; sep; sep = sep->se_next) {
1088 if (sep->se_fd == -1)
1091 switch (sep->se_family) {
1093 unlink(sep->se_service);
1095 default: /* case AF_INET, AF_INET6 */
1096 #if ENABLE_FEATURE_INETD_RPC
1097 if (sep->se_wait == 1 && is_rpc_service(sep))
1098 unregister_rpc(sep); /* XXX signal race */
1102 if (ENABLE_FEATURE_CLEAN_UP)
1105 remove_pidfile(_PATH_INETDPID);
1109 int inetd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1110 int inetd_main(int argc UNUSED_PARAM, char **argv)
1112 struct sigaction sa, saved_pipe_handler;
1113 servtab_t *sep, *sep2;
1115 struct group *grp = grp; /* for compiler */
1122 real_uid = getuid();
1123 if (real_uid != 0) /* run by non-root user */
1124 config_filename = NULL;
1126 opt_complementary = "R+:q+"; /* -q N, -R N */
1127 opt = getopt32(argv, "R:feq:", &max_concurrency, &global_queuelen);
1131 config_filename = argv[0];
1132 if (config_filename == NULL)
1133 bb_error_msg_and_die("non-root must specify config file");
1135 bb_daemonize_or_rexec(0, argv - optind);
1137 bb_sanitize_stdio();
1139 /* LOG_NDELAY: connect to syslog daemon NOW.
1140 * Otherwise, we may open syslog socket
1141 * in vforked child, making opened fds and syslog()
1142 * internal state inconsistent.
1143 * This was observed to leak file descriptors. */
1144 openlog(applet_name, LOG_PID | LOG_NDELAY, LOG_DAEMON);
1145 logmode = LOGMODE_SYSLOG;
1148 if (real_uid == 0) {
1149 /* run by root, ensure groups vector gets trashed */
1150 gid_t gid = getgid();
1154 write_pidfile(_PATH_INETDPID);
1156 /* never fails under Linux (except if you pass it bad arguments) */
1157 getrlimit(RLIMIT_NOFILE, &rlim_ofile);
1158 rlim_ofile_cur = rlim_ofile.rlim_cur;
1159 if (rlim_ofile_cur == RLIM_INFINITY) /* ! */
1160 rlim_ofile_cur = OPEN_MAX;
1162 memset(&sa, 0, sizeof(sa));
1163 /*sigemptyset(&sa.sa_mask); - memset did it */
1164 sigaddset(&sa.sa_mask, SIGALRM);
1165 sigaddset(&sa.sa_mask, SIGCHLD);
1166 sigaddset(&sa.sa_mask, SIGHUP);
1167 //FIXME: explain why no SA_RESTART
1168 //FIXME: retry_network_setup is unsafe to run in signal handler (many reasons)!
1169 sa.sa_handler = retry_network_setup;
1170 sigaction_set(SIGALRM, &sa);
1171 //FIXME: reread_config_file is unsafe to run in signal handler(many reasons)!
1172 sa.sa_handler = reread_config_file;
1173 sigaction_set(SIGHUP, &sa);
1174 //FIXME: reap_child is unsafe to run in signal handler (uses stdio)!
1175 sa.sa_handler = reap_child;
1176 sigaction_set(SIGCHLD, &sa);
1177 //FIXME: clean_up_and_exit is unsafe to run in signal handler (uses stdio)!
1178 sa.sa_handler = clean_up_and_exit;
1179 sigaction_set(SIGTERM, &sa);
1180 sa.sa_handler = clean_up_and_exit;
1181 sigaction_set(SIGINT, &sa);
1182 sa.sa_handler = SIG_IGN;
1183 sigaction(SIGPIPE, &sa, &saved_pipe_handler);
1185 reread_config_file(SIGHUP); /* load config from file */
1189 int ctrl, accepted_fd, new_udp_fd;
1193 recalculate_maxsock();
1195 readable = allsock; /* struct copy */
1196 /* if there are no fds to wait on, we will block
1197 * until signal wakes us up (maxsock == 0, but readable
1198 * never contains fds 0 and 1...) */
1199 ready_fd_cnt = select(maxsock + 1, &readable, NULL, NULL, NULL);
1200 if (ready_fd_cnt < 0) {
1201 if (errno != EINTR) {
1202 bb_perror_msg("select");
1208 for (sep = serv_list; ready_fd_cnt && sep; sep = sep->se_next) {
1209 if (sep->se_fd == -1 || !FD_ISSET(sep->se_fd, &readable))
1216 if (!sep->se_wait) {
1217 if (sep->se_socktype == SOCK_STREAM) {
1218 ctrl = accepted_fd = accept(sep->se_fd, NULL, NULL);
1221 bb_perror_msg("accept (for %s)", sep->se_service);
1226 if (sep->se_socktype == SOCK_DGRAM
1227 && sep->se_family != AF_UNIX
1229 /* How udp "nowait" works:
1230 * child peeks at (received and buffered by kernel) UDP packet,
1231 * performs connect() on the socket so that it is linked only
1232 * to this peer. But this also affects parent, because descriptors
1233 * are shared after fork() a-la dup(). When parent performs
1234 * select(), it will see this descriptor connected to the peer (!)
1235 * and still readable, will act on it and mess things up
1236 * (can create many copies of same child, etc).
1237 * Parent must create and use new socket instead. */
1238 new_udp_fd = socket(sep->se_family, SOCK_DGRAM, 0);
1239 if (new_udp_fd < 0) { /* error: eat packet, forget about it */
1241 recv(sep->se_fd, line, LINE_SIZE, MSG_DONTWAIT);
1244 setsockopt_reuseaddr(new_udp_fd);
1245 /* TODO: better do bind after vfork in parent,
1246 * so that we don't have two wildcard bound sockets
1247 * even for a brief moment? */
1248 if (bind(new_udp_fd, &sep->se_lsa->u.sa, sep->se_lsa->len) < 0) {
1255 block_CHLD_HUP_ALRM(&omask);
1257 #ifdef INETD_BUILTINS_ENABLED
1258 /* do we need to fork? */
1259 if (sep->se_builtin == NULL
1260 || (sep->se_socktype == SOCK_STREAM
1261 && sep->se_builtin->bi_fork))
1264 if (sep->se_max != 0) {
1265 if (++sep->se_count == 1)
1266 sep->se_time = monotonic_sec();
1267 else if (sep->se_count >= sep->se_max) {
1268 unsigned now = monotonic_sec();
1269 /* did we accumulate se_max connects too quickly? */
1270 if (now - sep->se_time <= CNT_INTERVAL) {
1271 bb_error_msg("%s/%s: too many connections, pausing",
1272 sep->se_service, sep->se_proto);
1273 remove_fd_from_set(sep->se_fd);
1277 rearm_alarm(); /* will revive it in RETRYTIME sec */
1278 restore_sigmask(&omask);
1279 maybe_close(accepted_fd);
1280 continue; /* -> check next fd in fd set */
1285 /* on NOMMU, streamed chargen
1286 * builtin wouldn't work, but it is
1287 * not allowed on NOMMU (ifdefed out) */
1288 #ifdef INETD_BUILTINS_ENABLED
1289 if (BB_MMU && sep->se_builtin)
1295 if (pid < 0) { /* fork error */
1296 bb_perror_msg("vfork"+1);
1298 restore_sigmask(&omask);
1299 maybe_close(accepted_fd);
1300 continue; /* -> check next fd in fd set */
1303 pid--; /* -1: "we did fork and we are child" */
1305 /* if pid == 0 here, we never forked */
1307 if (pid > 0) { /* parent */
1309 /* tcp wait: we passed listening socket to child,
1310 * will wait for child to terminate */
1312 remove_fd_from_set(sep->se_fd);
1314 if (new_udp_fd >= 0) {
1315 /* udp nowait: child connected the socket,
1316 * we created and will use new, unconnected one */
1317 xmove_fd(new_udp_fd, sep->se_fd);
1319 restore_sigmask(&omask);
1320 maybe_close(accepted_fd);
1321 continue; /* -> check next fd in fd set */
1324 /* we are either child or didn't vfork at all */
1325 #ifdef INETD_BUILTINS_ENABLED
1326 if (sep->se_builtin) {
1327 if (pid) { /* "pid" is -1: we did vfork */
1328 close(sep->se_fd); /* listening socket */
1329 logmode = LOGMODE_NONE; /* make xwrite etc silent */
1331 restore_sigmask(&omask);
1332 if (sep->se_socktype == SOCK_STREAM)
1333 sep->se_builtin->bi_stream_fn(ctrl, sep);
1335 sep->se_builtin->bi_dgram_fn(ctrl, sep);
1336 if (pid) /* we did vfork */
1337 _exit(EXIT_FAILURE);
1338 maybe_close(accepted_fd);
1339 continue; /* -> check next fd in fd set */
1345 if (new_udp_fd >= 0) {
1346 len_and_sockaddr *lsa = xzalloc_lsa(sep->se_family);
1347 /* peek at the packet and remember peer addr */
1348 int r = recvfrom(ctrl, NULL, 0, MSG_PEEK|MSG_DONTWAIT,
1349 &lsa->u.sa, &lsa->len);
1352 /* make this socket "connected" to peer addr:
1353 * only packets from this peer will be recv'ed,
1354 * and bare write()/send() will work on it */
1355 connect(ctrl, &lsa->u.sa, lsa->len);
1358 /* prepare env and exec program */
1359 pwd = getpwnam(sep->se_user);
1361 bb_error_msg("%s: no such %s", sep->se_user, "user");
1364 if (sep->se_group && (grp = getgrnam(sep->se_group)) == NULL) {
1365 bb_error_msg("%s: no such %s", sep->se_group, "group");
1368 if (real_uid != 0 && real_uid != pwd->pw_uid) {
1369 /* a user running private inetd */
1370 bb_error_msg("non-root must run services as himself");
1375 pwd->pw_gid = grp->gr_gid;
1376 /* initgroups, setgid, setuid: */
1377 change_identity(pwd);
1378 } else if (sep->se_group) {
1379 xsetgid(grp->gr_gid);
1380 setgroups(1, &grp->gr_gid);
1382 if (rlim_ofile.rlim_cur != rlim_ofile_cur)
1383 if (setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0)
1384 bb_perror_msg("setrlimit");
1386 /* closelog(); - WRONG. we are after vfork,
1387 * this may confuse syslog() internal state.
1388 * Let's hope libc sets syslog fd to CLOEXEC...
1390 xmove_fd(ctrl, STDIN_FILENO);
1391 xdup2(STDIN_FILENO, STDOUT_FILENO);
1392 /* manpages of inetd I managed to find either say
1393 * that stderr is also redirected to the network,
1394 * or do not talk about redirection at all (!) */
1395 if (!sep->se_wait) /* only for usual "tcp nowait" */
1396 xdup2(STDIN_FILENO, STDERR_FILENO);
1397 /* NB: among others, this loop closes listening sockets
1398 * for nowait stream children */
1399 for (sep2 = serv_list; sep2; sep2 = sep2->se_next)
1400 if (sep2->se_fd != ctrl)
1401 maybe_close(sep2->se_fd);
1402 sigaction_set(SIGPIPE, &saved_pipe_handler);
1403 restore_sigmask(&omask);
1404 BB_EXECVP(sep->se_program, sep->se_argv);
1405 bb_perror_msg("can't execute '%s'", sep->se_program);
1407 /* eat packet in udp case */
1408 if (sep->se_socktype != SOCK_STREAM)
1409 recv(0, line, LINE_SIZE, MSG_DONTWAIT);
1410 _exit(EXIT_FAILURE);
1411 } /* for (sep = servtab...) */
1416 static const char *const cat_args[] = { "cat", NULL };
1420 * Internet services provided internally by inetd:
1422 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
1423 /* Echo service -- echo data back. */
1425 static void FAST_FUNC echo_stream(int s, servtab_t *sep UNUSED_PARAM)
1429 ssize_t sz = safe_read(s, line, LINE_SIZE);
1432 xwrite(s, line, sz);
1435 /* We are after vfork here! */
1436 /* move network socket to stdin/stdout */
1437 xmove_fd(s, STDIN_FILENO);
1438 xdup2(STDIN_FILENO, STDOUT_FILENO);
1439 /* no error messages please... */
1440 close(STDERR_FILENO);
1441 xopen(bb_dev_null, O_WRONLY);
1442 BB_EXECVP("cat", (char**)cat_args);
1443 /* on failure we return to main, which does exit(EXIT_FAILURE) */
1446 static void FAST_FUNC echo_dg(int s, servtab_t *sep)
1448 enum { BUFSIZE = 12*1024 }; /* for jumbo sized packets! :) */
1449 char *buf = xmalloc(BUFSIZE); /* too big for stack */
1451 len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
1453 lsa->len = sep->se_lsa->len;
1454 /* dgram builtins are non-forking - DONT BLOCK! */
1455 sz = recvfrom(s, buf, BUFSIZE, MSG_DONTWAIT, &lsa->u.sa, &lsa->len);
1457 sendto(s, buf, sz, 0, &lsa->u.sa, lsa->len);
1460 #endif /* FEATURE_INETD_SUPPORT_BUILTIN_ECHO */
1463 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
1464 /* Discard service -- ignore data. */
1466 static void FAST_FUNC discard_stream(int s, servtab_t *sep UNUSED_PARAM)
1469 while (safe_read(s, line, LINE_SIZE) > 0)
1472 /* We are after vfork here! */
1473 /* move network socket to stdin */
1474 xmove_fd(s, STDIN_FILENO);
1475 /* discard output */
1476 close(STDOUT_FILENO);
1477 xopen(bb_dev_null, O_WRONLY);
1478 /* no error messages please... */
1479 xdup2(STDOUT_FILENO, STDERR_FILENO);
1480 BB_EXECVP("cat", (char**)cat_args);
1481 /* on failure we return to main, which does exit(EXIT_FAILURE) */
1485 static void FAST_FUNC discard_dg(int s, servtab_t *sep UNUSED_PARAM)
1487 /* dgram builtins are non-forking - DONT BLOCK! */
1488 recv(s, line, LINE_SIZE, MSG_DONTWAIT);
1490 #endif /* FEATURE_INETD_SUPPORT_BUILTIN_DISCARD */
1493 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
1495 static void init_ring(void)
1500 for (i = ' '; i < 127; i++)
1503 /* Character generator. MMU arches only. */
1505 static void FAST_FUNC chargen_stream(int s, servtab_t *sep UNUSED_PARAM)
1509 char text[LINESIZ + 2];
1516 text[LINESIZ] = '\r';
1517 text[LINESIZ + 1] = '\n';
1520 len = end_ring - rs;
1522 memmove(text, rs, LINESIZ);
1524 memmove(text, rs, len);
1525 memmove(text + len, ring, LINESIZ - len);
1527 if (++rs == end_ring)
1529 xwrite(s, text, sizeof(text));
1533 static void FAST_FUNC chargen_dg(int s, servtab_t *sep)
1536 char text[LINESIZ + 2];
1537 len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
1539 /* Eat UDP packet which started it all */
1540 /* dgram builtins are non-forking - DONT BLOCK! */
1541 lsa->len = sep->se_lsa->len;
1542 if (recvfrom(s, text, sizeof(text), MSG_DONTWAIT, &lsa->u.sa, &lsa->len) < 0)
1550 len = end_ring - ring_pos;
1552 memmove(text, ring_pos, LINESIZ);
1554 memmove(text, ring_pos, len);
1555 memmove(text + len, ring, LINESIZ - len);
1557 if (++ring_pos == end_ring)
1559 text[LINESIZ] = '\r';
1560 text[LINESIZ + 1] = '\n';
1561 sendto(s, text, sizeof(text), 0, &lsa->u.sa, lsa->len);
1563 #endif /* FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN */
1566 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME
1568 * Return a machine readable date and time, in the form of the
1569 * number of seconds since midnight, Jan 1, 1900. Since gettimeofday
1570 * returns the number of seconds since midnight, Jan 1, 1970,
1571 * we must add 2208988800 seconds to this figure to make up for
1572 * some seventy years Bell Labs was asleep.
1574 static uint32_t machtime(void)
1578 gettimeofday(&tv, NULL);
1579 return htonl((uint32_t)(tv.tv_sec + 2208988800));
1582 static void FAST_FUNC machtime_stream(int s, servtab_t *sep UNUSED_PARAM)
1586 result = machtime();
1587 full_write(s, &result, sizeof(result));
1589 static void FAST_FUNC machtime_dg(int s, servtab_t *sep)
1592 len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
1594 lsa->len = sep->se_lsa->len;
1595 if (recvfrom(s, line, LINE_SIZE, MSG_DONTWAIT, &lsa->u.sa, &lsa->len) < 0)
1598 result = machtime();
1599 sendto(s, &result, sizeof(result), 0, &lsa->u.sa, lsa->len);
1601 #endif /* FEATURE_INETD_SUPPORT_BUILTIN_TIME */
1604 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
1605 /* Return human-readable time of day */
1607 static void FAST_FUNC daytime_stream(int s, servtab_t *sep UNUSED_PARAM)
1612 fdprintf(s, "%.24s\r\n", ctime(&t));
1614 static void FAST_FUNC daytime_dg(int s, servtab_t *sep)
1617 len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
1619 lsa->len = sep->se_lsa->len;
1620 if (recvfrom(s, line, LINE_SIZE, MSG_DONTWAIT, &lsa->u.sa, &lsa->len) < 0)
1624 sprintf(line, "%.24s\r\n", ctime(&t));
1625 sendto(s, line, strlen(line), 0, &lsa->u.sa, lsa->len);
1627 #endif /* FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME */