Commit | Line | Data |
---|---|---|
528b0614 | 1 | /* |
f4b24d5f KB |
2 | * Copyright (c) 1983, 1991, 1993 |
3 | * The Regents of the University of California. All rights reserved. | |
9166e6a5 | 4 | * |
32ce521f | 5 | * %sccs.include.redist.c% |
528b0614 DF |
6 | */ |
7 | ||
8 | #ifndef lint | |
f4b24d5f KB |
9 | static char copyright[] = |
10 | "@(#) Copyright (c) 1983, 1991, 1993\n\ | |
11 | The Regents of the University of California. All rights reserved.\n"; | |
9166e6a5 | 12 | #endif /* not lint */ |
528b0614 | 13 | |
21ed1185 | 14 | #ifndef lint |
f4b24d5f | 15 | static char sccsid[] = "@(#)inetd.c 8.1 (Berkeley) %G%"; |
9166e6a5 | 16 | #endif /* not lint */ |
21ed1185 MK |
17 | |
18 | /* | |
19 | * Inetd - Internet super-server | |
20 | * | |
6e9dfe5b AC |
21 | * This program invokes all internet services as needed. Connection-oriented |
22 | * services are invoked each time a connection is made, by creating a process. | |
23 | * This process is passed the connection as file descriptor 0 and is expected | |
24 | * to do a getpeername to find out the source host and port. | |
21ed1185 MK |
25 | * |
26 | * Datagram oriented services are invoked when a datagram | |
27 | * arrives; a process is created and passed a pending message | |
28 | * on file descriptor 0. Datagram servers may either connect | |
29 | * to their peer, freeing up the original socket for inetd | |
30 | * to receive further messages on, or ``take over the socket'', | |
31 | * processing all arriving datagrams and, eventually, timing | |
32 | * out. The first type of server is said to be ``multi-threaded''; | |
33 | * the second type of server ``single-threaded''. | |
34 | * | |
35 | * Inetd uses a configuration file which is read at startup | |
36 | * and, possibly, at some later time in response to a hangup signal. | |
37 | * The configuration file is ``free format'' with fields given in the | |
38 | * order shown below. Continuation lines for an entry must being with | |
39 | * a space or tab. All fields must be present in each entry. | |
40 | * | |
6e9dfe5b AC |
41 | * service name must be in /etc/services or must |
42 | * name a tcpmux service | |
21ed1185 MK |
43 | * socket type stream/dgram/raw/rdm/seqpacket |
44 | * protocol must be in /etc/protocols | |
45 | * wait/nowait single-threaded/multi-threaded | |
7d5eb6c4 | 46 | * user user to run daemon as |
21ed1185 | 47 | * server program full path name |
cc4df4a4 | 48 | * server program arguments maximum of MAXARGS (20) |
21ed1185 | 49 | * |
6e9dfe5b AC |
50 | * TCP services without official port numbers are handled with the |
51 | * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for | |
52 | * requests. When a connection is made from a foreign host, the service | |
53 | * requested is passed to tcpmux, which looks it up in the servtab list | |
54 | * and returns the proper entry for the service. Tcpmux returns a | |
55 | * negative reply if the service doesn't exist, otherwise the invoked | |
56 | * server is expected to return the positive reply if the service type in | |
57 | * inetd.conf file has the prefix "tcpmux/". If the service type has the | |
58 | * prefix "tcpmux/+", tcpmux will return the positive reply for the | |
59 | * process; this is for compatibility with older server code, and also | |
60 | * allows you to invoke programs that use stdin/stdout without putting any | |
61 | * special server code in them. Services that use tcpmux are "nowait" | |
62 | * because they do not have a well-known port and hence cannot listen | |
63 | * for new requests. | |
64 | * | |
21ed1185 MK |
65 | * Comment lines are indicated by a `#' in column 1. |
66 | */ | |
67 | #include <sys/param.h> | |
68 | #include <sys/stat.h> | |
69 | #include <sys/ioctl.h> | |
70 | #include <sys/socket.h> | |
21ed1185 | 71 | #include <sys/wait.h> |
2a6b82aa JL |
72 | #include <sys/time.h> |
73 | #include <sys/resource.h> | |
21ed1185 MK |
74 | |
75 | #include <netinet/in.h> | |
76 | #include <arpa/inet.h> | |
77 | ||
78 | #include <errno.h> | |
6e9dfe5b | 79 | #include <fcntl.h> |
21ed1185 | 80 | #include <netdb.h> |
7d5eb6c4 | 81 | #include <pwd.h> |
6e9dfe5b | 82 | #include <signal.h> |
567752b5 | 83 | #include <stdio.h> |
6e9dfe5b | 84 | #include <stdlib.h> |
38dde0cd | 85 | #include <string.h> |
6e9dfe5b AC |
86 | #include <syslog.h> |
87 | #include <unistd.h> | |
88 | ||
bd070810 | 89 | #include "pathnames.h" |
21ed1185 | 90 | |
fc99bd8d MK |
91 | #define TOOMANY 40 /* don't start more than TOOMANY */ |
92 | #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */ | |
93 | #define RETRYTIME (60*10) /* retry after bind or server fail */ | |
94 | ||
95 | #define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM)) | |
96 | ||
21ed1185 | 97 | |
664e9651 | 98 | void config(), reapchild(), retry(); |
21ed1185 MK |
99 | |
100 | int debug = 0; | |
5859fc43 MK |
101 | int nsock, maxsock; |
102 | fd_set allsock; | |
21ed1185 | 103 | int options; |
fc99bd8d | 104 | int timingout; |
6e9dfe5b | 105 | int toomany = TOOMANY; |
21ed1185 MK |
106 | struct servent *sp; |
107 | ||
108 | struct servtab { | |
109 | char *se_service; /* name of service */ | |
110 | int se_socktype; /* type of socket to use */ | |
111 | char *se_proto; /* protocol used */ | |
112 | short se_wait; /* single threaded server */ | |
113 | short se_checked; /* looked at during merge */ | |
7d5eb6c4 | 114 | char *se_user; /* user name to run as */ |
b1b30605 | 115 | struct biltin *se_bi; /* if built-in, description */ |
21ed1185 | 116 | char *se_server; /* server program */ |
cc4df4a4 | 117 | #define MAXARGV 20 |
21ed1185 MK |
118 | char *se_argv[MAXARGV+1]; /* program arguments */ |
119 | int se_fd; /* open descriptor */ | |
6e9dfe5b | 120 | int se_type; /* type */ |
21ed1185 | 121 | struct sockaddr_in se_ctrladdr;/* bound address */ |
fc99bd8d MK |
122 | int se_count; /* number started since se_time */ |
123 | struct timeval se_time; /* start of se_count */ | |
21ed1185 MK |
124 | struct servtab *se_next; |
125 | } *servtab; | |
126 | ||
6e9dfe5b AC |
127 | #define NORM_TYPE 0 |
128 | #define MUX_TYPE 1 | |
129 | #define MUXPLUS_TYPE 2 | |
130 | #define ISMUX(sep) (((sep)->se_type == MUX_TYPE) || \ | |
131 | ((sep)->se_type == MUXPLUS_TYPE)) | |
132 | #define ISMUXPLUS(sep) ((sep)->se_type == MUXPLUS_TYPE) | |
133 | ||
b1b30605 MK |
134 | int echo_stream(), discard_stream(), machtime_stream(); |
135 | int daytime_stream(), chargen_stream(); | |
136 | int echo_dg(), discard_dg(), machtime_dg(), daytime_dg(), chargen_dg(); | |
6e9dfe5b | 137 | struct servtab *tcpmux(); |
b1b30605 MK |
138 | |
139 | struct biltin { | |
140 | char *bi_service; /* internally provided service name */ | |
141 | int bi_socktype; /* type of socket supported */ | |
142 | short bi_fork; /* 1 if should fork before call */ | |
143 | short bi_wait; /* 1 if should wait for child */ | |
144 | int (*bi_fn)(); /* function which performs it */ | |
145 | } biltins[] = { | |
146 | /* Echo received data */ | |
147 | "echo", SOCK_STREAM, 1, 0, echo_stream, | |
148 | "echo", SOCK_DGRAM, 0, 0, echo_dg, | |
149 | ||
150 | /* Internet /dev/null */ | |
151 | "discard", SOCK_STREAM, 1, 0, discard_stream, | |
152 | "discard", SOCK_DGRAM, 0, 0, discard_dg, | |
153 | ||
154 | /* Return 32 bit time since 1970 */ | |
155 | "time", SOCK_STREAM, 0, 0, machtime_stream, | |
156 | "time", SOCK_DGRAM, 0, 0, machtime_dg, | |
157 | ||
158 | /* Return human-readable time */ | |
159 | "daytime", SOCK_STREAM, 0, 0, daytime_stream, | |
160 | "daytime", SOCK_DGRAM, 0, 0, daytime_dg, | |
161 | ||
162 | /* Familiar character generator */ | |
163 | "chargen", SOCK_STREAM, 1, 0, chargen_stream, | |
164 | "chargen", SOCK_DGRAM, 0, 0, chargen_dg, | |
6e9dfe5b AC |
165 | |
166 | "tcpmux", SOCK_STREAM, 1, 0, (int (*)())tcpmux, | |
167 | ||
168 | NULL | |
b1b30605 MK |
169 | }; |
170 | ||
171 | #define NUMINT (sizeof(intab) / sizeof(struct inent)) | |
bd070810 | 172 | char *CONFIG = _PATH_INETDCONF; |
b1b30605 MK |
173 | char **Argv; |
174 | char *LastArg; | |
21ed1185 | 175 | |
b1b30605 | 176 | main(argc, argv, envp) |
21ed1185 | 177 | int argc; |
b1b30605 | 178 | char *argv[], *envp[]; |
21ed1185 | 179 | { |
21ed1185 | 180 | register struct servtab *sep; |
7d5eb6c4 | 181 | register struct passwd *pwd; |
567752b5 | 182 | register int tmpint; |
fc99bd8d | 183 | struct sigvec sv; |
567752b5 KB |
184 | int ch, pid, dofork; |
185 | char buf[50]; | |
21ed1185 | 186 | |
b1b30605 MK |
187 | Argv = argv; |
188 | if (envp == 0 || *envp == 0) | |
189 | envp = argv; | |
190 | while (*envp) | |
191 | envp++; | |
192 | LastArg = envp[-1] + strlen(envp[-1]); | |
21ed1185 | 193 | |
6e9dfe5b AC |
194 | openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON); |
195 | ||
196 | while ((ch = getopt(argc, argv, "dR:")) != EOF) | |
567752b5 | 197 | switch(ch) { |
21ed1185 MK |
198 | case 'd': |
199 | debug = 1; | |
200 | options |= SO_DEBUG; | |
201 | break; | |
6e9dfe5b AC |
202 | case 'R': { /* invocation rate */ |
203 | char *p; | |
204 | ||
205 | tmpint = strtol(optarg, &p, 0); | |
206 | if (tmpint < 1 || *p) | |
207 | syslog(LOG_ERR, | |
208 | "-R %s: bad value for service invocation rate", | |
209 | optarg); | |
210 | else | |
211 | toomany = tmpint; | |
212 | break; | |
213 | } | |
567752b5 | 214 | case '?': |
21ed1185 | 215 | default: |
6e9dfe5b AC |
216 | syslog(LOG_ERR, |
217 | "usage: inetd [-d] [-R rate] [conf-file]"); | |
567752b5 | 218 | exit(1); |
21ed1185 | 219 | } |
567752b5 KB |
220 | argc -= optind; |
221 | argv += optind; | |
222 | ||
21ed1185 MK |
223 | if (argc > 0) |
224 | CONFIG = argv[0]; | |
6e9dfe5b | 225 | if (debug == 0) { |
995785db | 226 | daemon(0, 0); |
6e9dfe5b AC |
227 | } |
228 | bzero(&sv, sizeof(sv)); | |
fc99bd8d MK |
229 | sv.sv_mask = SIGBLOCK; |
230 | sv.sv_handler = retry; | |
231 | sigvec(SIGALRM, &sv, (struct sigvec *)0); | |
21ed1185 | 232 | config(); |
fc99bd8d MK |
233 | sv.sv_handler = config; |
234 | sigvec(SIGHUP, &sv, (struct sigvec *)0); | |
235 | sv.sv_handler = reapchild; | |
236 | sigvec(SIGCHLD, &sv, (struct sigvec *)0); | |
237 | ||
567752b5 KB |
238 | { |
239 | /* space for daemons to overwrite environment for ps */ | |
240 | #define DUMMYSIZE 100 | |
241 | char dummy[DUMMYSIZE]; | |
242 | ||
243 | (void)memset(dummy, 'x', sizeof(DUMMYSIZE) - 1); | |
244 | dummy[DUMMYSIZE - 1] = '\0'; | |
245 | (void)setenv("inetd_dummy", dummy, 1); | |
246 | } | |
247 | ||
21ed1185 | 248 | for (;;) { |
567752b5 | 249 | int n, ctrl; |
fc99bd8d MK |
250 | fd_set readable; |
251 | ||
0ee95e67 MK |
252 | if (nsock == 0) { |
253 | (void) sigblock(SIGBLOCK); | |
254 | while (nsock == 0) | |
92732149 KB |
255 | sigpause(0L); |
256 | (void) sigsetmask(0L); | |
0ee95e67 | 257 | } |
fc99bd8d MK |
258 | readable = allsock; |
259 | if ((n = select(maxsock + 1, &readable, (fd_set *)0, | |
260 | (fd_set *)0, (struct timeval *)0)) <= 0) { | |
261 | if (n < 0 && errno != EINTR) | |
6e9dfe5b | 262 | syslog(LOG_WARNING, "select: %m"); |
fc99bd8d MK |
263 | sleep(1); |
264 | continue; | |
265 | } | |
266 | for (sep = servtab; n && sep; sep = sep->se_next) | |
093d40e3 MK |
267 | if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) { |
268 | n--; | |
269 | if (debug) | |
270 | fprintf(stderr, "someone wants %s\n", | |
271 | sep->se_service); | |
272 | if (sep->se_socktype == SOCK_STREAM) { | |
273 | ctrl = accept(sep->se_fd, (struct sockaddr *)0, | |
274 | (int *)0); | |
275 | if (debug) | |
276 | fprintf(stderr, "accept, ctrl %d\n", ctrl); | |
277 | if (ctrl < 0) { | |
6e9dfe5b AC |
278 | if (errno != EINTR) |
279 | syslog(LOG_WARNING, | |
280 | "accept (for %s): %m", | |
281 | sep->se_service); | |
093d40e3 MK |
282 | continue; |
283 | } | |
6e9dfe5b AC |
284 | /* |
285 | * Call tcpmux to find the real service to exec. | |
286 | */ | |
287 | if (sep->se_bi && | |
288 | sep->se_bi->bi_fn == (int (*)()) tcpmux) { | |
289 | sep = tcpmux(ctrl); | |
290 | if (sep == NULL) { | |
291 | close(ctrl); | |
292 | continue; | |
293 | } | |
294 | } | |
093d40e3 MK |
295 | } else |
296 | ctrl = sep->se_fd; | |
297 | (void) sigblock(SIGBLOCK); | |
298 | pid = 0; | |
299 | dofork = (sep->se_bi == 0 || sep->se_bi->bi_fork); | |
300 | if (dofork) { | |
301 | if (sep->se_count++ == 0) | |
302 | (void)gettimeofday(&sep->se_time, | |
303 | (struct timezone *)0); | |
6e9dfe5b | 304 | else if (sep->se_count >= toomany) { |
fc99bd8d MK |
305 | struct timeval now; |
306 | ||
307 | (void)gettimeofday(&now, (struct timezone *)0); | |
308 | if (now.tv_sec - sep->se_time.tv_sec > | |
309 | CNT_INTVL) { | |
310 | sep->se_time = now; | |
311 | sep->se_count = 1; | |
312 | } else { | |
313 | syslog(LOG_ERR, | |
6e9dfe5b | 314 | "%s/%s server failing (looping), service terminated", |
fc99bd8d | 315 | sep->se_service, sep->se_proto); |
6e9dfe5b AC |
316 | close_sep(sep); |
317 | sigsetmask(0L); | |
fc99bd8d MK |
318 | if (!timingout) { |
319 | timingout = 1; | |
320 | alarm(RETRYTIME); | |
321 | } | |
6e9dfe5b | 322 | continue; |
fc99bd8d | 323 | } |
093d40e3 MK |
324 | } |
325 | pid = fork(); | |
326 | } | |
327 | if (pid < 0) { | |
328 | syslog(LOG_ERR, "fork: %m"); | |
329 | if (sep->se_socktype == SOCK_STREAM) | |
330 | close(ctrl); | |
331 | sigsetmask(0L); | |
332 | sleep(1); | |
333 | continue; | |
334 | } | |
335 | if (pid && sep->se_wait) { | |
336 | sep->se_wait = pid; | |
514e253c KB |
337 | if (sep->se_fd >= 0) { |
338 | FD_CLR(sep->se_fd, &allsock); | |
339 | nsock--; | |
340 | } | |
093d40e3 MK |
341 | } |
342 | sigsetmask(0L); | |
343 | if (pid == 0) { | |
344 | if (debug && dofork) | |
995785db | 345 | setsid(); |
6e9dfe5b AC |
346 | if (dofork) { |
347 | if (debug) | |
348 | fprintf(stderr, "+ Closing from %d\n", | |
349 | maxsock); | |
350 | for (tmpint = maxsock; tmpint > 2; tmpint--) | |
567752b5 KB |
351 | if (tmpint != ctrl) |
352 | close(tmpint); | |
6e9dfe5b | 353 | } |
093d40e3 | 354 | if (sep->se_bi) |
b1b30605 | 355 | (*sep->se_bi->bi_fn)(ctrl, sep); |
093d40e3 MK |
356 | else { |
357 | if (debug) | |
358 | fprintf(stderr, "%d execl %s\n", | |
359 | getpid(), sep->se_server); | |
b1b30605 MK |
360 | dup2(ctrl, 0); |
361 | close(ctrl); | |
362 | dup2(0, 1); | |
363 | dup2(0, 2); | |
364 | if ((pwd = getpwnam(sep->se_user)) == NULL) { | |
365 | syslog(LOG_ERR, | |
6e9dfe5b AC |
366 | "%s/%s: %s: No such user", |
367 | sep->se_service, sep->se_proto, | |
368 | sep->se_user); | |
fc99bd8d MK |
369 | if (sep->se_socktype != SOCK_STREAM) |
370 | recv(0, buf, sizeof (buf), 0); | |
b1b30605 MK |
371 | _exit(1); |
372 | } | |
373 | if (pwd->pw_uid) { | |
6e9dfe5b AC |
374 | if (setgid(pwd->pw_gid) < 0) { |
375 | syslog(LOG_ERR, | |
376 | "%s: can't set gid %d: %m", | |
377 | sep->se_service, pwd->pw_gid); | |
378 | _exit(1); | |
379 | } | |
380 | (void) initgroups(pwd->pw_name, | |
381 | pwd->pw_gid); | |
382 | if (setuid(pwd->pw_uid) < 0) { | |
383 | syslog(LOG_ERR, | |
384 | "%s: can't set uid %d: %m", | |
385 | sep->se_service, pwd->pw_uid); | |
386 | _exit(1); | |
387 | } | |
b1b30605 | 388 | } |
b1b30605 MK |
389 | execv(sep->se_server, sep->se_argv); |
390 | if (sep->se_socktype != SOCK_STREAM) | |
391 | recv(0, buf, sizeof (buf), 0); | |
6e9dfe5b AC |
392 | syslog(LOG_ERR, |
393 | "cannot execute %s: %m", sep->se_server); | |
b1b30605 | 394 | _exit(1); |
093d40e3 MK |
395 | } |
396 | } | |
397 | if (sep->se_socktype == SOCK_STREAM) | |
398 | close(ctrl); | |
21ed1185 | 399 | } |
21ed1185 MK |
400 | } |
401 | } | |
402 | ||
664e9651 | 403 | void |
21ed1185 MK |
404 | reapchild() |
405 | { | |
093d40e3 | 406 | int status; |
21ed1185 MK |
407 | int pid; |
408 | register struct servtab *sep; | |
409 | ||
410 | for (;;) { | |
093d40e3 | 411 | pid = wait3(&status, WNOHANG, (struct rusage *)0); |
21ed1185 MK |
412 | if (pid <= 0) |
413 | break; | |
414 | if (debug) | |
6e9dfe5b AC |
415 | fprintf(stderr, "%d reaped, status %#x\n", |
416 | pid, status); | |
21ed1185 MK |
417 | for (sep = servtab; sep; sep = sep->se_next) |
418 | if (sep->se_wait == pid) { | |
093d40e3 | 419 | if (status) |
6a3125d9 RC |
420 | syslog(LOG_WARNING, |
421 | "%s: exit status 0x%x", | |
21ed1185 MK |
422 | sep->se_server, status); |
423 | if (debug) | |
424 | fprintf(stderr, "restored %s, fd %d\n", | |
425 | sep->se_service, sep->se_fd); | |
5859fc43 MK |
426 | FD_SET(sep->se_fd, &allsock); |
427 | nsock++; | |
21ed1185 MK |
428 | sep->se_wait = 1; |
429 | } | |
430 | } | |
431 | } | |
432 | ||
664e9651 | 433 | void |
21ed1185 MK |
434 | config() |
435 | { | |
436 | register struct servtab *sep, *cp, **sepp; | |
437 | struct servtab *getconfigent(), *enter(); | |
6e9dfe5b | 438 | struct passwd *pwd; |
92732149 | 439 | long omask; |
21ed1185 MK |
440 | |
441 | if (!setconfig()) { | |
6a3125d9 | 442 | syslog(LOG_ERR, "%s: %m", CONFIG); |
21ed1185 MK |
443 | return; |
444 | } | |
445 | for (sep = servtab; sep; sep = sep->se_next) | |
446 | sep->se_checked = 0; | |
447 | while (cp = getconfigent()) { | |
6e9dfe5b AC |
448 | if ((pwd = getpwnam(cp->se_user)) == NULL) { |
449 | syslog(LOG_ERR, | |
450 | "%s/%s: No such user '%s', service ignored", | |
451 | cp->se_service, cp->se_proto, cp->se_user); | |
452 | continue; | |
453 | } | |
21ed1185 MK |
454 | for (sep = servtab; sep; sep = sep->se_next) |
455 | if (strcmp(sep->se_service, cp->se_service) == 0 && | |
456 | strcmp(sep->se_proto, cp->se_proto) == 0) | |
457 | break; | |
458 | if (sep != 0) { | |
459 | int i; | |
460 | ||
fc99bd8d | 461 | omask = sigblock(SIGBLOCK); |
90aae428 KB |
462 | /* |
463 | * sep->se_wait may be holding the pid of a daemon | |
464 | * that we're waiting for. If so, don't overwrite | |
465 | * it unless the config file explicitly says don't | |
466 | * wait. | |
467 | */ | |
468 | if (cp->se_bi == 0 && | |
469 | (sep->se_wait == 1 || cp->se_wait == 0)) | |
fc99bd8d | 470 | sep->se_wait = cp->se_wait; |
21ed1185 | 471 | #define SWAP(a, b) { char *c = a; a = b; b = c; } |
2a6b82aa JL |
472 | if (cp->se_user) |
473 | SWAP(sep->se_user, cp->se_user); | |
21ed1185 MK |
474 | if (cp->se_server) |
475 | SWAP(sep->se_server, cp->se_server); | |
476 | for (i = 0; i < MAXARGV; i++) | |
477 | SWAP(sep->se_argv[i], cp->se_argv[i]); | |
478 | sigsetmask(omask); | |
479 | freeconfig(cp); | |
9a0fbd5b MK |
480 | if (debug) |
481 | print_service("REDO", sep); | |
482 | } else { | |
21ed1185 | 483 | sep = enter(cp); |
9a0fbd5b MK |
484 | if (debug) |
485 | print_service("ADD ", sep); | |
486 | } | |
21ed1185 | 487 | sep->se_checked = 1; |
6e9dfe5b AC |
488 | if (ISMUX(sep)) { |
489 | sep->se_fd = -1; | |
490 | continue; | |
491 | } | |
21ed1185 MK |
492 | sp = getservbyname(sep->se_service, sep->se_proto); |
493 | if (sp == 0) { | |
6a3125d9 | 494 | syslog(LOG_ERR, "%s/%s: unknown service", |
21ed1185 | 495 | sep->se_service, sep->se_proto); |
6e9dfe5b | 496 | sep->se_checked = 0; |
21ed1185 MK |
497 | continue; |
498 | } | |
fc99bd8d | 499 | if (sp->s_port != sep->se_ctrladdr.sin_port) { |
5003ab23 | 500 | sep->se_ctrladdr.sin_family = AF_INET; |
fc99bd8d | 501 | sep->se_ctrladdr.sin_port = sp->s_port; |
6e9dfe5b AC |
502 | if (sep->se_fd >= 0) |
503 | close_sep(sep); | |
21ed1185 | 504 | } |
fc99bd8d MK |
505 | if (sep->se_fd == -1) |
506 | setup(sep); | |
21ed1185 MK |
507 | } |
508 | endconfig(); | |
509 | /* | |
510 | * Purge anything not looked at above. | |
511 | */ | |
fc99bd8d | 512 | omask = sigblock(SIGBLOCK); |
21ed1185 MK |
513 | sepp = &servtab; |
514 | while (sep = *sepp) { | |
515 | if (sep->se_checked) { | |
516 | sepp = &sep->se_next; | |
517 | continue; | |
518 | } | |
519 | *sepp = sep->se_next; | |
6e9dfe5b AC |
520 | if (sep->se_fd >= 0) |
521 | close_sep(sep); | |
9a0fbd5b MK |
522 | if (debug) |
523 | print_service("FREE", sep); | |
21ed1185 MK |
524 | freeconfig(sep); |
525 | free((char *)sep); | |
526 | } | |
527 | (void) sigsetmask(omask); | |
528 | } | |
529 | ||
664e9651 | 530 | void |
fc99bd8d MK |
531 | retry() |
532 | { | |
533 | register struct servtab *sep; | |
534 | ||
535 | timingout = 0; | |
536 | for (sep = servtab; sep; sep = sep->se_next) | |
537 | if (sep->se_fd == -1) | |
538 | setup(sep); | |
539 | } | |
540 | ||
541 | setup(sep) | |
542 | register struct servtab *sep; | |
543 | { | |
544 | int on = 1; | |
545 | ||
546 | if ((sep->se_fd = socket(AF_INET, sep->se_socktype, 0)) < 0) { | |
6e9dfe5b AC |
547 | if (debug) |
548 | fprintf(stderr, "socket failed on %s/%s: %s\n", | |
549 | sep->se_service, sep->se_proto, | |
550 | strerror(errno)); | |
fc99bd8d MK |
551 | syslog(LOG_ERR, "%s/%s: socket: %m", |
552 | sep->se_service, sep->se_proto); | |
553 | return; | |
554 | } | |
555 | #define turnon(fd, opt) \ | |
556 | setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) | |
557 | if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && | |
558 | turnon(sep->se_fd, SO_DEBUG) < 0) | |
559 | syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); | |
560 | if (turnon(sep->se_fd, SO_REUSEADDR) < 0) | |
561 | syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); | |
562 | #undef turnon | |
95236f21 | 563 | if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr, |
fc99bd8d | 564 | sizeof (sep->se_ctrladdr)) < 0) { |
6e9dfe5b AC |
565 | if (debug) |
566 | fprintf(stderr, "bind failed on %s/%s: %s\n", | |
567 | sep->se_service, sep->se_proto, | |
568 | strerror(errno)); | |
fc99bd8d MK |
569 | syslog(LOG_ERR, "%s/%s: bind: %m", |
570 | sep->se_service, sep->se_proto); | |
571 | (void) close(sep->se_fd); | |
572 | sep->se_fd = -1; | |
573 | if (!timingout) { | |
574 | timingout = 1; | |
575 | alarm(RETRYTIME); | |
576 | } | |
577 | return; | |
578 | } | |
579 | if (sep->se_socktype == SOCK_STREAM) | |
580 | listen(sep->se_fd, 10); | |
581 | FD_SET(sep->se_fd, &allsock); | |
582 | nsock++; | |
583 | if (sep->se_fd > maxsock) | |
584 | maxsock = sep->se_fd; | |
6e9dfe5b AC |
585 | if (debug) { |
586 | fprintf(stderr, "registered %s on %d\n", | |
587 | sep->se_server, sep->se_fd); | |
588 | } | |
589 | } | |
590 | ||
591 | /* | |
592 | * Finish with a service and its socket. | |
593 | */ | |
594 | close_sep(sep) | |
595 | register struct servtab *sep; | |
596 | { | |
597 | if (sep->se_fd >= 0) { | |
598 | nsock--; | |
599 | FD_CLR(sep->se_fd, &allsock); | |
600 | (void) close(sep->se_fd); | |
601 | sep->se_fd = -1; | |
602 | } | |
603 | sep->se_count = 0; | |
604 | /* | |
605 | * Don't keep the pid of this running deamon: when reapchild() | |
606 | * reaps this pid, it would erroneously increment nsock. | |
607 | */ | |
608 | if (sep->se_wait > 1) | |
609 | sep->se_wait = 1; | |
fc99bd8d MK |
610 | } |
611 | ||
21ed1185 MK |
612 | struct servtab * |
613 | enter(cp) | |
614 | struct servtab *cp; | |
615 | { | |
616 | register struct servtab *sep; | |
92732149 | 617 | long omask; |
21ed1185 MK |
618 | |
619 | sep = (struct servtab *)malloc(sizeof (*sep)); | |
620 | if (sep == (struct servtab *)0) { | |
6a3125d9 | 621 | syslog(LOG_ERR, "Out of memory."); |
21ed1185 MK |
622 | exit(-1); |
623 | } | |
624 | *sep = *cp; | |
625 | sep->se_fd = -1; | |
fc99bd8d | 626 | omask = sigblock(SIGBLOCK); |
21ed1185 MK |
627 | sep->se_next = servtab; |
628 | servtab = sep; | |
629 | sigsetmask(omask); | |
630 | return (sep); | |
631 | } | |
632 | ||
633 | FILE *fconfig = NULL; | |
634 | struct servtab serv; | |
635 | char line[256]; | |
6e9dfe5b | 636 | char *sskip(), *skip(), *nextline(); |
21ed1185 MK |
637 | |
638 | setconfig() | |
639 | { | |
640 | ||
641 | if (fconfig != NULL) { | |
6e9dfe5b | 642 | fseek(fconfig, 0L, SEEK_SET); |
21ed1185 MK |
643 | return (1); |
644 | } | |
645 | fconfig = fopen(CONFIG, "r"); | |
646 | return (fconfig != NULL); | |
647 | } | |
648 | ||
649 | endconfig() | |
650 | { | |
567752b5 KB |
651 | if (fconfig) { |
652 | (void) fclose(fconfig); | |
653 | fconfig = NULL; | |
654 | } | |
21ed1185 MK |
655 | } |
656 | ||
657 | struct servtab * | |
658 | getconfigent() | |
659 | { | |
660 | register struct servtab *sep = &serv; | |
21ed1185 | 661 | int argc; |
95236f21 | 662 | char *cp, *arg, *newstr(); |
6e9dfe5b AC |
663 | static char TCPMUX_TOKEN[] = "tcpmux/"; |
664 | #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) | |
21ed1185 | 665 | |
b1b30605 | 666 | more: |
6e9dfe5b | 667 | while ((cp = nextline(fconfig)) && (*cp == '#' || *cp == '\0')) |
21ed1185 MK |
668 | ; |
669 | if (cp == NULL) | |
670 | return ((struct servtab *)0); | |
6e9dfe5b AC |
671 | /* |
672 | * clear the static buffer, since some fields (se_ctrladdr, | |
673 | * for example) don't get initialized here. | |
674 | */ | |
675 | bzero((caddr_t)sep, sizeof *sep); | |
21ed1185 | 676 | arg = skip(&cp); |
6e9dfe5b AC |
677 | if (cp == NULL) { |
678 | /* got an empty line containing just blanks/tabs. */ | |
679 | goto more; | |
680 | } | |
681 | if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { | |
682 | char *c = arg + MUX_LEN; | |
683 | if (*c == '+') { | |
684 | sep->se_type = MUXPLUS_TYPE; | |
685 | c++; | |
686 | } else | |
687 | sep->se_type = MUX_TYPE; | |
688 | sep->se_service = newstr(c); | |
689 | } else { | |
690 | sep->se_service = newstr(arg); | |
691 | sep->se_type = NORM_TYPE; | |
692 | } | |
693 | arg = sskip(&cp); | |
21ed1185 MK |
694 | if (strcmp(arg, "stream") == 0) |
695 | sep->se_socktype = SOCK_STREAM; | |
696 | else if (strcmp(arg, "dgram") == 0) | |
697 | sep->se_socktype = SOCK_DGRAM; | |
698 | else if (strcmp(arg, "rdm") == 0) | |
699 | sep->se_socktype = SOCK_RDM; | |
700 | else if (strcmp(arg, "seqpacket") == 0) | |
701 | sep->se_socktype = SOCK_SEQPACKET; | |
702 | else if (strcmp(arg, "raw") == 0) | |
703 | sep->se_socktype = SOCK_RAW; | |
704 | else | |
705 | sep->se_socktype = -1; | |
6e9dfe5b AC |
706 | sep->se_proto = newstr(sskip(&cp)); |
707 | arg = sskip(&cp); | |
21ed1185 | 708 | sep->se_wait = strcmp(arg, "wait") == 0; |
6e9dfe5b AC |
709 | if (ISMUX(sep)) { |
710 | /* | |
711 | * Silently enforce "nowait" for TCPMUX services since | |
712 | * they don't have an assigned port to listen on. | |
713 | */ | |
714 | sep->se_wait = 0; | |
715 | ||
716 | if (strcmp(sep->se_proto, "tcp")) { | |
717 | syslog(LOG_ERR, | |
718 | "%s: bad protocol for tcpmux service %s", | |
719 | CONFIG, sep->se_service); | |
720 | goto more; | |
721 | } | |
722 | if (sep->se_socktype != SOCK_STREAM) { | |
723 | syslog(LOG_ERR, | |
724 | "%s: bad socket type for tcpmux service %s", | |
725 | CONFIG, sep->se_service); | |
726 | goto more; | |
727 | } | |
728 | } | |
729 | sep->se_user = newstr(sskip(&cp)); | |
730 | sep->se_server = newstr(sskip(&cp)); | |
b1b30605 MK |
731 | if (strcmp(sep->se_server, "internal") == 0) { |
732 | register struct biltin *bi; | |
733 | ||
734 | for (bi = biltins; bi->bi_service; bi++) | |
735 | if (bi->bi_socktype == sep->se_socktype && | |
736 | strcmp(bi->bi_service, sep->se_service) == 0) | |
737 | break; | |
738 | if (bi->bi_service == 0) { | |
6e9dfe5b | 739 | syslog(LOG_ERR, "internal service %s unknown", |
b1b30605 MK |
740 | sep->se_service); |
741 | goto more; | |
742 | } | |
743 | sep->se_bi = bi; | |
744 | sep->se_wait = bi->bi_wait; | |
9a0fbd5b MK |
745 | } else |
746 | sep->se_bi = NULL; | |
21ed1185 MK |
747 | argc = 0; |
748 | for (arg = skip(&cp); cp; arg = skip(&cp)) | |
749 | if (argc < MAXARGV) | |
95236f21 | 750 | sep->se_argv[argc++] = newstr(arg); |
21ed1185 MK |
751 | while (argc <= MAXARGV) |
752 | sep->se_argv[argc++] = NULL; | |
753 | return (sep); | |
754 | } | |
755 | ||
756 | freeconfig(cp) | |
757 | register struct servtab *cp; | |
758 | { | |
759 | int i; | |
760 | ||
761 | if (cp->se_service) | |
762 | free(cp->se_service); | |
763 | if (cp->se_proto) | |
764 | free(cp->se_proto); | |
2a6b82aa JL |
765 | if (cp->se_user) |
766 | free(cp->se_user); | |
21ed1185 MK |
767 | if (cp->se_server) |
768 | free(cp->se_server); | |
769 | for (i = 0; i < MAXARGV; i++) | |
770 | if (cp->se_argv[i]) | |
771 | free(cp->se_argv[i]); | |
772 | } | |
773 | ||
6e9dfe5b AC |
774 | |
775 | /* | |
776 | * Safe skip - if skip returns null, log a syntax error in the | |
777 | * configuration file and exit. | |
778 | */ | |
779 | char * | |
780 | sskip(cpp) | |
781 | char **cpp; | |
782 | { | |
783 | register char *cp; | |
784 | ||
785 | cp = skip(cpp); | |
786 | if (cp == NULL) { | |
787 | syslog(LOG_ERR, "%s: syntax error", CONFIG); | |
788 | exit(-1); | |
789 | } | |
790 | return (cp); | |
791 | } | |
792 | ||
21ed1185 MK |
793 | char * |
794 | skip(cpp) | |
795 | char **cpp; | |
796 | { | |
797 | register char *cp = *cpp; | |
798 | char *start; | |
799 | ||
800 | again: | |
801 | while (*cp == ' ' || *cp == '\t') | |
802 | cp++; | |
803 | if (*cp == '\0') { | |
4650c563 | 804 | int c; |
21ed1185 MK |
805 | |
806 | c = getc(fconfig); | |
567752b5 | 807 | (void) ungetc(c, fconfig); |
21ed1185 MK |
808 | if (c == ' ' || c == '\t') |
809 | if (cp = nextline(fconfig)) | |
810 | goto again; | |
811 | *cpp = (char *)0; | |
812 | return ((char *)0); | |
813 | } | |
814 | start = cp; | |
815 | while (*cp && *cp != ' ' && *cp != '\t') | |
816 | cp++; | |
817 | if (*cp != '\0') | |
818 | *cp++ = '\0'; | |
819 | *cpp = cp; | |
820 | return (start); | |
821 | } | |
822 | ||
823 | char * | |
824 | nextline(fd) | |
825 | FILE *fd; | |
826 | { | |
827 | char *cp; | |
828 | ||
2a6b82aa | 829 | if (fgets(line, sizeof (line), fd) == NULL) |
21ed1185 MK |
830 | return ((char *)0); |
831 | cp = index(line, '\n'); | |
832 | if (cp) | |
833 | *cp = '\0'; | |
834 | return (line); | |
835 | } | |
836 | ||
837 | char * | |
95236f21 | 838 | newstr(cp) |
21ed1185 MK |
839 | char *cp; |
840 | { | |
093d40e3 | 841 | if (cp = strdup(cp ? cp : "")) |
95236f21 | 842 | return(cp); |
093d40e3 | 843 | syslog(LOG_ERR, "strdup: %m"); |
95236f21 | 844 | exit(-1); |
21ed1185 | 845 | } |
b1b30605 MK |
846 | |
847 | setproctitle(a, s) | |
848 | char *a; | |
849 | int s; | |
850 | { | |
851 | int size; | |
852 | register char *cp; | |
853 | struct sockaddr_in sin; | |
854 | char buf[80]; | |
855 | ||
856 | cp = Argv[0]; | |
857 | size = sizeof(sin); | |
95236f21 | 858 | if (getpeername(s, (struct sockaddr *)&sin, &size) == 0) |
9bd38ba8 | 859 | (void) sprintf(buf, "-%s [%s]", a, inet_ntoa(sin.sin_addr)); |
b1b30605 | 860 | else |
9bd38ba8 | 861 | (void) sprintf(buf, "-%s", a); |
b1b30605 MK |
862 | strncpy(cp, buf, LastArg - cp); |
863 | cp += strlen(cp); | |
864 | while (cp < LastArg) | |
865 | *cp++ = ' '; | |
866 | } | |
867 | ||
868 | /* | |
869 | * Internet services provided internally by inetd: | |
870 | */ | |
a1fe6118 | 871 | #define BUFSIZE 8192 |
b1b30605 MK |
872 | |
873 | /* ARGSUSED */ | |
874 | echo_stream(s, sep) /* Echo service -- echo data back */ | |
875 | int s; | |
876 | struct servtab *sep; | |
877 | { | |
b9c70736 | 878 | char buffer[BUFSIZE]; |
b1b30605 MK |
879 | int i; |
880 | ||
0ee95e67 | 881 | setproctitle(sep->se_service, s); |
b1b30605 MK |
882 | while ((i = read(s, buffer, sizeof(buffer))) > 0 && |
883 | write(s, buffer, i) > 0) | |
884 | ; | |
885 | exit(0); | |
886 | } | |
887 | ||
888 | /* ARGSUSED */ | |
889 | echo_dg(s, sep) /* Echo service -- echo data back */ | |
890 | int s; | |
891 | struct servtab *sep; | |
892 | { | |
b9c70736 | 893 | char buffer[BUFSIZE]; |
b1b30605 MK |
894 | int i, size; |
895 | struct sockaddr sa; | |
896 | ||
897 | size = sizeof(sa); | |
898 | if ((i = recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size)) < 0) | |
899 | return; | |
900 | (void) sendto(s, buffer, i, 0, &sa, sizeof(sa)); | |
901 | } | |
902 | ||
903 | /* ARGSUSED */ | |
904 | discard_stream(s, sep) /* Discard service -- ignore data */ | |
905 | int s; | |
906 | struct servtab *sep; | |
907 | { | |
a1fe6118 | 908 | int ret; |
b9c70736 | 909 | char buffer[BUFSIZE]; |
b1b30605 | 910 | |
0ee95e67 | 911 | setproctitle(sep->se_service, s); |
b1b30605 | 912 | while (1) { |
a1fe6118 | 913 | while ((ret = read(s, buffer, sizeof(buffer))) > 0) |
b1b30605 | 914 | ; |
a1fe6118 | 915 | if (ret == 0 || errno != EINTR) |
b1b30605 MK |
916 | break; |
917 | } | |
918 | exit(0); | |
919 | } | |
920 | ||
921 | /* ARGSUSED */ | |
922 | discard_dg(s, sep) /* Discard service -- ignore data */ | |
923 | int s; | |
924 | struct servtab *sep; | |
925 | { | |
b9c70736 | 926 | char buffer[BUFSIZE]; |
b1b30605 MK |
927 | |
928 | (void) read(s, buffer, sizeof(buffer)); | |
929 | } | |
930 | ||
931 | #include <ctype.h> | |
932 | #define LINESIZ 72 | |
933 | char ring[128]; | |
934 | char *endring; | |
935 | ||
936 | initring() | |
937 | { | |
938 | register int i; | |
939 | ||
940 | endring = ring; | |
941 | ||
942 | for (i = 0; i <= 128; ++i) | |
943 | if (isprint(i)) | |
944 | *endring++ = i; | |
945 | } | |
946 | ||
947 | /* ARGSUSED */ | |
948 | chargen_stream(s, sep) /* Character generator */ | |
949 | int s; | |
950 | struct servtab *sep; | |
951 | { | |
92732149 KB |
952 | register char *rs; |
953 | int len; | |
b1b30605 | 954 | char text[LINESIZ+2]; |
b1b30605 | 955 | |
0ee95e67 | 956 | setproctitle(sep->se_service, s); |
92732149 KB |
957 | |
958 | if (!endring) { | |
b1b30605 | 959 | initring(); |
92732149 KB |
960 | rs = ring; |
961 | } | |
b1b30605 | 962 | |
92732149 KB |
963 | text[LINESIZ] = '\r'; |
964 | text[LINESIZ + 1] = '\n'; | |
965 | for (rs = ring;;) { | |
966 | if ((len = endring - rs) >= LINESIZ) | |
967 | bcopy(rs, text, LINESIZ); | |
968 | else { | |
969 | bcopy(rs, text, len); | |
970 | bcopy(ring, text + len, LINESIZ - len); | |
b1b30605 | 971 | } |
92732149 KB |
972 | if (++rs == endring) |
973 | rs = ring; | |
974 | if (write(s, text, sizeof(text)) != sizeof(text)) | |
b1b30605 MK |
975 | break; |
976 | } | |
977 | exit(0); | |
978 | } | |
979 | ||
980 | /* ARGSUSED */ | |
981 | chargen_dg(s, sep) /* Character generator */ | |
982 | int s; | |
983 | struct servtab *sep; | |
984 | { | |
b1b30605 | 985 | struct sockaddr sa; |
92732149 KB |
986 | static char *rs; |
987 | int len, size; | |
988 | char text[LINESIZ+2]; | |
b1b30605 | 989 | |
92732149 | 990 | if (endring == 0) { |
b1b30605 | 991 | initring(); |
92732149 KB |
992 | rs = ring; |
993 | } | |
b1b30605 MK |
994 | |
995 | size = sizeof(sa); | |
996 | if (recvfrom(s, text, sizeof(text), 0, &sa, &size) < 0) | |
997 | return; | |
b1b30605 | 998 | |
92732149 KB |
999 | if ((len = endring - rs) >= LINESIZ) |
1000 | bcopy(rs, text, LINESIZ); | |
1001 | else { | |
1002 | bcopy(rs, text, len); | |
1003 | bcopy(ring, text + len, LINESIZ - len); | |
1004 | } | |
1005 | if (++rs == endring) | |
1006 | rs = ring; | |
1007 | text[LINESIZ] = '\r'; | |
1008 | text[LINESIZ + 1] = '\n'; | |
b1b30605 MK |
1009 | (void) sendto(s, text, sizeof(text), 0, &sa, sizeof(sa)); |
1010 | } | |
1011 | ||
1012 | /* | |
1013 | * Return a machine readable date and time, in the form of the | |
1014 | * number of seconds since midnight, Jan 1, 1900. Since gettimeofday | |
1015 | * returns the number of seconds since midnight, Jan 1, 1970, | |
1016 | * we must add 2208988800 seconds to this figure to make up for | |
1017 | * some seventy years Bell Labs was asleep. | |
1018 | */ | |
b1b30605 MK |
1019 | |
1020 | long | |
1021 | machtime() | |
1022 | { | |
1023 | struct timeval tv; | |
1024 | ||
2a6b82aa | 1025 | if (gettimeofday(&tv, (struct timezone *)0) < 0) { |
6e9dfe5b AC |
1026 | if (debug) |
1027 | fprintf(stderr, "Unable to get time of day\n"); | |
2a6b82aa | 1028 | return (0L); |
b1b30605 | 1029 | } |
9a61decd CT |
1030 | #define OFFSET ((u_long)25567 * 24*60*60) |
1031 | return (htonl((long)(tv.tv_sec + OFFSET))); | |
1032 | #undef OFFSET | |
b1b30605 MK |
1033 | } |
1034 | ||
1035 | /* ARGSUSED */ | |
1036 | machtime_stream(s, sep) | |
1037 | int s; | |
1038 | struct servtab *sep; | |
1039 | { | |
1040 | long result; | |
1041 | ||
1042 | result = machtime(); | |
1043 | (void) write(s, (char *) &result, sizeof(result)); | |
1044 | } | |
1045 | ||
1046 | /* ARGSUSED */ | |
1047 | machtime_dg(s, sep) | |
1048 | int s; | |
1049 | struct servtab *sep; | |
1050 | { | |
1051 | long result; | |
1052 | struct sockaddr sa; | |
1053 | int size; | |
1054 | ||
1055 | size = sizeof(sa); | |
2a6b82aa | 1056 | if (recvfrom(s, (char *)&result, sizeof(result), 0, &sa, &size) < 0) |
b1b30605 MK |
1057 | return; |
1058 | result = machtime(); | |
1059 | (void) sendto(s, (char *) &result, sizeof(result), 0, &sa, sizeof(sa)); | |
1060 | } | |
1061 | ||
1062 | /* ARGSUSED */ | |
1063 | daytime_stream(s, sep) /* Return human-readable time of day */ | |
1064 | int s; | |
1065 | struct servtab *sep; | |
1066 | { | |
1067 | char buffer[256]; | |
6e9dfe5b | 1068 | time_t clock; |
b1b30605 MK |
1069 | |
1070 | clock = time((time_t *) 0); | |
1071 | ||
9bd38ba8 | 1072 | (void) sprintf(buffer, "%.24s\r\n", ctime(&clock)); |
2a6b82aa | 1073 | (void) write(s, buffer, strlen(buffer)); |
b1b30605 MK |
1074 | } |
1075 | ||
1076 | /* ARGSUSED */ | |
1077 | daytime_dg(s, sep) /* Return human-readable time of day */ | |
1078 | int s; | |
1079 | struct servtab *sep; | |
1080 | { | |
1081 | char buffer[256]; | |
6e9dfe5b | 1082 | time_t clock; |
b1b30605 MK |
1083 | struct sockaddr sa; |
1084 | int size; | |
b1b30605 MK |
1085 | |
1086 | clock = time((time_t *) 0); | |
1087 | ||
1088 | size = sizeof(sa); | |
1089 | if (recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size) < 0) | |
1090 | return; | |
9bd38ba8 | 1091 | (void) sprintf(buffer, "%.24s\r\n", ctime(&clock)); |
b1b30605 MK |
1092 | (void) sendto(s, buffer, strlen(buffer), 0, &sa, sizeof(sa)); |
1093 | } | |
9a0fbd5b MK |
1094 | |
1095 | /* | |
1096 | * print_service: | |
1097 | * Dump relevant information to stderr | |
1098 | */ | |
1099 | print_service(action, sep) | |
1100 | char *action; | |
1101 | struct servtab *sep; | |
1102 | { | |
1103 | fprintf(stderr, | |
1104 | "%s: %s proto=%s, wait=%d, user=%s builtin=%x server=%s\n", | |
1105 | action, sep->se_service, sep->se_proto, | |
567752b5 | 1106 | sep->se_wait, sep->se_user, (int)sep->se_bi, sep->se_server); |
9a0fbd5b | 1107 | } |
6e9dfe5b AC |
1108 | |
1109 | /* | |
1110 | * Based on TCPMUX.C by Mark K. Lottor November 1988 | |
1111 | * sri-nic::ps:<mkl>tcpmux.c | |
1112 | */ | |
1113 | ||
1114 | ||
1115 | static int /* # of characters upto \r,\n or \0 */ | |
1116 | getline(fd, buf, len) | |
1117 | int fd; | |
1118 | char *buf; | |
1119 | int len; | |
1120 | { | |
1121 | int count = 0, n; | |
1122 | ||
1123 | do { | |
1124 | n = read(fd, buf, len-count); | |
1125 | if (n == 0) | |
1126 | return count; | |
1127 | if (n < 0) | |
1128 | return (-1); | |
1129 | while (--n >= 0) { | |
1130 | if (*buf == '\r' || *buf == '\n' || *buf == '\0') | |
1131 | return count; | |
1132 | count++; | |
1133 | buf++; | |
1134 | } | |
1135 | } while (count < len); | |
1136 | return (count); | |
1137 | } | |
1138 | ||
1139 | #define MAX_SERV_LEN (256+2) /* 2 bytes for \r\n */ | |
1140 | ||
1141 | #define strwrite(fd, buf) (void) write(fd, buf, sizeof(buf)-1) | |
1142 | ||
1143 | struct servtab * | |
1144 | tcpmux(s) | |
1145 | int s; | |
1146 | { | |
1147 | register struct servtab *sep; | |
1148 | char service[MAX_SERV_LEN+1]; | |
1149 | int len; | |
1150 | ||
1151 | /* Get requested service name */ | |
1152 | if ((len = getline(s, service, MAX_SERV_LEN)) < 0) { | |
1153 | strwrite(s, "-Error reading service name\r\n"); | |
1154 | return(NULL); | |
1155 | } | |
1156 | service[len] = '\0'; | |
1157 | ||
1158 | if (debug) | |
1159 | fprintf(stderr, "tcpmux: someone wants %s\n", service); | |
1160 | ||
1161 | /* | |
1162 | * Help is a required command, and lists available services, | |
1163 | * one per line. | |
1164 | */ | |
1165 | if (!strcasecmp(service,"help")) { | |
1166 | for (sep = servtab; sep; sep = sep->se_next) { | |
1167 | if (!ISMUX(sep)) | |
1168 | continue; | |
1169 | (void) write(s, sep->se_service, strlen(sep->se_service)); | |
1170 | strwrite(s, "\r\n"); | |
1171 | } | |
1172 | return(NULL); | |
1173 | } | |
1174 | ||
1175 | /* Try matching a service in inetd.conf with the request */ | |
1176 | for (sep = servtab; sep; sep = sep->se_next) { | |
1177 | if (!ISMUX(sep)) | |
1178 | continue; | |
1179 | if (!strcasecmp(service,sep->se_service)) { | |
1180 | if (ISMUXPLUS(sep)) { | |
1181 | strwrite(s, "+Go\r\n"); | |
1182 | } | |
1183 | return(sep); | |
1184 | } | |
1185 | } | |
1186 | strwrite(s, "-Service not available\r\n"); | |
1187 | return(NULL); | |
1188 | } |