Commit | Line | Data |
---|---|---|
528b0614 | 1 | /* |
a1fe6118 | 2 | * Copyright (c) 1983,1991 The Regents of the University of California. |
9166e6a5 KB |
3 | * All rights reserved. |
4 | * | |
32ce521f | 5 | * %sccs.include.redist.c% |
528b0614 DF |
6 | */ |
7 | ||
8 | #ifndef lint | |
9 | char copyright[] = | |
10 | "@(#) Copyright (c) 1983 Regents of the University of California.\n\ | |
11 | All rights reserved.\n"; | |
9166e6a5 | 12 | #endif /* not lint */ |
528b0614 | 13 | |
21ed1185 | 14 | #ifndef lint |
a1fe6118 | 15 | static char sccsid[] = "@(#)inetd.c 5.30 (Berkeley) %G%"; |
9166e6a5 | 16 | #endif /* not lint */ |
21ed1185 MK |
17 | |
18 | /* | |
19 | * Inetd - Internet super-server | |
20 | * | |
21 | * This program invokes all internet services as needed. | |
22 | * connection-oriented services are invoked each time a | |
23 | * connection is made, by creating a process. This process | |
24 | * is passed the connection as file descriptor 0 and is | |
25 | * expected to do a getpeername to find out the source host | |
26 | * and port. | |
27 | * | |
28 | * Datagram oriented services are invoked when a datagram | |
29 | * arrives; a process is created and passed a pending message | |
30 | * on file descriptor 0. Datagram servers may either connect | |
31 | * to their peer, freeing up the original socket for inetd | |
32 | * to receive further messages on, or ``take over the socket'', | |
33 | * processing all arriving datagrams and, eventually, timing | |
34 | * out. The first type of server is said to be ``multi-threaded''; | |
35 | * the second type of server ``single-threaded''. | |
36 | * | |
37 | * Inetd uses a configuration file which is read at startup | |
38 | * and, possibly, at some later time in response to a hangup signal. | |
39 | * The configuration file is ``free format'' with fields given in the | |
40 | * order shown below. Continuation lines for an entry must being with | |
41 | * a space or tab. All fields must be present in each entry. | |
42 | * | |
43 | * service name must be in /etc/services | |
44 | * socket type stream/dgram/raw/rdm/seqpacket | |
45 | * protocol must be in /etc/protocols | |
46 | * wait/nowait single-threaded/multi-threaded | |
7d5eb6c4 | 47 | * user user to run daemon as |
21ed1185 | 48 | * server program full path name |
cc4df4a4 | 49 | * server program arguments maximum of MAXARGS (20) |
21ed1185 MK |
50 | * |
51 | * Comment lines are indicated by a `#' in column 1. | |
52 | */ | |
53 | #include <sys/param.h> | |
54 | #include <sys/stat.h> | |
55 | #include <sys/ioctl.h> | |
56 | #include <sys/socket.h> | |
57 | #include <sys/file.h> | |
58 | #include <sys/wait.h> | |
2a6b82aa JL |
59 | #include <sys/time.h> |
60 | #include <sys/resource.h> | |
21ed1185 MK |
61 | |
62 | #include <netinet/in.h> | |
63 | #include <arpa/inet.h> | |
64 | ||
65 | #include <errno.h> | |
21ed1185 MK |
66 | #include <signal.h> |
67 | #include <netdb.h> | |
6a3125d9 | 68 | #include <syslog.h> |
7d5eb6c4 | 69 | #include <pwd.h> |
567752b5 | 70 | #include <stdio.h> |
38dde0cd | 71 | #include <string.h> |
bd070810 | 72 | #include "pathnames.h" |
21ed1185 | 73 | |
fc99bd8d MK |
74 | #define TOOMANY 40 /* don't start more than TOOMANY */ |
75 | #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */ | |
76 | #define RETRYTIME (60*10) /* retry after bind or server fail */ | |
77 | ||
78 | #define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM)) | |
79 | ||
21ed1185 MK |
80 | extern int errno; |
81 | ||
664e9651 | 82 | void config(), reapchild(), retry(); |
21ed1185 MK |
83 | char *index(); |
84 | char *malloc(); | |
85 | ||
86 | int debug = 0; | |
5859fc43 MK |
87 | int nsock, maxsock; |
88 | fd_set allsock; | |
21ed1185 | 89 | int options; |
fc99bd8d | 90 | int timingout; |
21ed1185 MK |
91 | struct servent *sp; |
92 | ||
93 | struct servtab { | |
94 | char *se_service; /* name of service */ | |
95 | int se_socktype; /* type of socket to use */ | |
96 | char *se_proto; /* protocol used */ | |
97 | short se_wait; /* single threaded server */ | |
98 | short se_checked; /* looked at during merge */ | |
7d5eb6c4 | 99 | char *se_user; /* user name to run as */ |
b1b30605 | 100 | struct biltin *se_bi; /* if built-in, description */ |
21ed1185 | 101 | char *se_server; /* server program */ |
cc4df4a4 | 102 | #define MAXARGV 20 |
21ed1185 MK |
103 | char *se_argv[MAXARGV+1]; /* program arguments */ |
104 | int se_fd; /* open descriptor */ | |
105 | struct sockaddr_in se_ctrladdr;/* bound address */ | |
fc99bd8d MK |
106 | int se_count; /* number started since se_time */ |
107 | struct timeval se_time; /* start of se_count */ | |
21ed1185 MK |
108 | struct servtab *se_next; |
109 | } *servtab; | |
110 | ||
b1b30605 MK |
111 | int echo_stream(), discard_stream(), machtime_stream(); |
112 | int daytime_stream(), chargen_stream(); | |
113 | int echo_dg(), discard_dg(), machtime_dg(), daytime_dg(), chargen_dg(); | |
114 | ||
115 | struct biltin { | |
116 | char *bi_service; /* internally provided service name */ | |
117 | int bi_socktype; /* type of socket supported */ | |
118 | short bi_fork; /* 1 if should fork before call */ | |
119 | short bi_wait; /* 1 if should wait for child */ | |
120 | int (*bi_fn)(); /* function which performs it */ | |
121 | } biltins[] = { | |
122 | /* Echo received data */ | |
123 | "echo", SOCK_STREAM, 1, 0, echo_stream, | |
124 | "echo", SOCK_DGRAM, 0, 0, echo_dg, | |
125 | ||
126 | /* Internet /dev/null */ | |
127 | "discard", SOCK_STREAM, 1, 0, discard_stream, | |
128 | "discard", SOCK_DGRAM, 0, 0, discard_dg, | |
129 | ||
130 | /* Return 32 bit time since 1970 */ | |
131 | "time", SOCK_STREAM, 0, 0, machtime_stream, | |
132 | "time", SOCK_DGRAM, 0, 0, machtime_dg, | |
133 | ||
134 | /* Return human-readable time */ | |
135 | "daytime", SOCK_STREAM, 0, 0, daytime_stream, | |
136 | "daytime", SOCK_DGRAM, 0, 0, daytime_dg, | |
137 | ||
138 | /* Familiar character generator */ | |
139 | "chargen", SOCK_STREAM, 1, 0, chargen_stream, | |
140 | "chargen", SOCK_DGRAM, 0, 0, chargen_dg, | |
141 | 0 | |
142 | }; | |
143 | ||
144 | #define NUMINT (sizeof(intab) / sizeof(struct inent)) | |
bd070810 | 145 | char *CONFIG = _PATH_INETDCONF; |
b1b30605 MK |
146 | char **Argv; |
147 | char *LastArg; | |
21ed1185 | 148 | |
b1b30605 | 149 | main(argc, argv, envp) |
21ed1185 | 150 | int argc; |
b1b30605 | 151 | char *argv[], *envp[]; |
21ed1185 | 152 | { |
567752b5 KB |
153 | extern char *optarg; |
154 | extern int optind; | |
21ed1185 | 155 | register struct servtab *sep; |
7d5eb6c4 | 156 | register struct passwd *pwd; |
567752b5 | 157 | register int tmpint; |
fc99bd8d | 158 | struct sigvec sv; |
567752b5 KB |
159 | int ch, pid, dofork; |
160 | char buf[50]; | |
21ed1185 | 161 | |
b1b30605 MK |
162 | Argv = argv; |
163 | if (envp == 0 || *envp == 0) | |
164 | envp = argv; | |
165 | while (*envp) | |
166 | envp++; | |
167 | LastArg = envp[-1] + strlen(envp[-1]); | |
21ed1185 | 168 | |
567752b5 KB |
169 | while ((ch = getopt(argc, argv, "d")) != EOF) |
170 | switch(ch) { | |
21ed1185 MK |
171 | case 'd': |
172 | debug = 1; | |
173 | options |= SO_DEBUG; | |
174 | break; | |
567752b5 | 175 | case '?': |
21ed1185 | 176 | default: |
567752b5 KB |
177 | fprintf(stderr, "usage: inetd [-d]"); |
178 | exit(1); | |
21ed1185 | 179 | } |
567752b5 KB |
180 | argc -= optind; |
181 | argv += optind; | |
182 | ||
21ed1185 MK |
183 | if (argc > 0) |
184 | CONFIG = argv[0]; | |
995785db MK |
185 | if (debug == 0) |
186 | daemon(0, 0); | |
fc99bd8d MK |
187 | openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON); |
188 | bzero((char *)&sv, sizeof(sv)); | |
189 | sv.sv_mask = SIGBLOCK; | |
190 | sv.sv_handler = retry; | |
191 | sigvec(SIGALRM, &sv, (struct sigvec *)0); | |
21ed1185 | 192 | config(); |
fc99bd8d MK |
193 | sv.sv_handler = config; |
194 | sigvec(SIGHUP, &sv, (struct sigvec *)0); | |
195 | sv.sv_handler = reapchild; | |
196 | sigvec(SIGCHLD, &sv, (struct sigvec *)0); | |
197 | ||
567752b5 KB |
198 | { |
199 | /* space for daemons to overwrite environment for ps */ | |
200 | #define DUMMYSIZE 100 | |
201 | char dummy[DUMMYSIZE]; | |
202 | ||
203 | (void)memset(dummy, 'x', sizeof(DUMMYSIZE) - 1); | |
204 | dummy[DUMMYSIZE - 1] = '\0'; | |
205 | (void)setenv("inetd_dummy", dummy, 1); | |
206 | } | |
207 | ||
21ed1185 | 208 | for (;;) { |
567752b5 | 209 | int n, ctrl; |
fc99bd8d MK |
210 | fd_set readable; |
211 | ||
0ee95e67 MK |
212 | if (nsock == 0) { |
213 | (void) sigblock(SIGBLOCK); | |
214 | while (nsock == 0) | |
92732149 KB |
215 | sigpause(0L); |
216 | (void) sigsetmask(0L); | |
0ee95e67 | 217 | } |
fc99bd8d MK |
218 | readable = allsock; |
219 | if ((n = select(maxsock + 1, &readable, (fd_set *)0, | |
220 | (fd_set *)0, (struct timeval *)0)) <= 0) { | |
221 | if (n < 0 && errno != EINTR) | |
0ee95e67 | 222 | syslog(LOG_WARNING, "select: %m\n"); |
fc99bd8d MK |
223 | sleep(1); |
224 | continue; | |
225 | } | |
226 | for (sep = servtab; n && sep; sep = sep->se_next) | |
093d40e3 MK |
227 | if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) { |
228 | n--; | |
229 | if (debug) | |
230 | fprintf(stderr, "someone wants %s\n", | |
231 | sep->se_service); | |
232 | if (sep->se_socktype == SOCK_STREAM) { | |
233 | ctrl = accept(sep->se_fd, (struct sockaddr *)0, | |
234 | (int *)0); | |
235 | if (debug) | |
236 | fprintf(stderr, "accept, ctrl %d\n", ctrl); | |
237 | if (ctrl < 0) { | |
238 | if (errno == EINTR) | |
239 | continue; | |
240 | syslog(LOG_WARNING, "accept (for %s): %m", | |
241 | sep->se_service); | |
242 | continue; | |
243 | } | |
244 | } else | |
245 | ctrl = sep->se_fd; | |
246 | (void) sigblock(SIGBLOCK); | |
247 | pid = 0; | |
248 | dofork = (sep->se_bi == 0 || sep->se_bi->bi_fork); | |
249 | if (dofork) { | |
250 | if (sep->se_count++ == 0) | |
251 | (void)gettimeofday(&sep->se_time, | |
252 | (struct timezone *)0); | |
253 | else if (sep->se_count >= TOOMANY) { | |
fc99bd8d MK |
254 | struct timeval now; |
255 | ||
256 | (void)gettimeofday(&now, (struct timezone *)0); | |
257 | if (now.tv_sec - sep->se_time.tv_sec > | |
258 | CNT_INTVL) { | |
259 | sep->se_time = now; | |
260 | sep->se_count = 1; | |
261 | } else { | |
262 | syslog(LOG_ERR, | |
263 | "%s/%s server failing (looping), service terminated\n", | |
264 | sep->se_service, sep->se_proto); | |
265 | FD_CLR(sep->se_fd, &allsock); | |
266 | (void) close(sep->se_fd); | |
267 | sep->se_fd = -1; | |
268 | sep->se_count = 0; | |
269 | nsock--; | |
fc99bd8d MK |
270 | if (!timingout) { |
271 | timingout = 1; | |
272 | alarm(RETRYTIME); | |
273 | } | |
fc99bd8d | 274 | } |
093d40e3 MK |
275 | } |
276 | pid = fork(); | |
277 | } | |
278 | if (pid < 0) { | |
279 | syslog(LOG_ERR, "fork: %m"); | |
280 | if (sep->se_socktype == SOCK_STREAM) | |
281 | close(ctrl); | |
282 | sigsetmask(0L); | |
283 | sleep(1); | |
284 | continue; | |
285 | } | |
286 | if (pid && sep->se_wait) { | |
287 | sep->se_wait = pid; | |
514e253c KB |
288 | if (sep->se_fd >= 0) { |
289 | FD_CLR(sep->se_fd, &allsock); | |
290 | nsock--; | |
291 | } | |
093d40e3 MK |
292 | } |
293 | sigsetmask(0L); | |
294 | if (pid == 0) { | |
295 | if (debug && dofork) | |
995785db | 296 | setsid(); |
093d40e3 | 297 | if (dofork) |
585aea84 | 298 | for (tmpint = maxsock; --tmpint > 2; ) |
567752b5 KB |
299 | if (tmpint != ctrl) |
300 | close(tmpint); | |
093d40e3 | 301 | if (sep->se_bi) |
b1b30605 | 302 | (*sep->se_bi->bi_fn)(ctrl, sep); |
093d40e3 MK |
303 | else { |
304 | if (debug) | |
305 | fprintf(stderr, "%d execl %s\n", | |
306 | getpid(), sep->se_server); | |
b1b30605 MK |
307 | dup2(ctrl, 0); |
308 | close(ctrl); | |
309 | dup2(0, 1); | |
310 | dup2(0, 2); | |
311 | if ((pwd = getpwnam(sep->se_user)) == NULL) { | |
312 | syslog(LOG_ERR, | |
093d40e3 MK |
313 | "getpwnam: %s: No such user", |
314 | sep->se_user); | |
fc99bd8d MK |
315 | if (sep->se_socktype != SOCK_STREAM) |
316 | recv(0, buf, sizeof (buf), 0); | |
b1b30605 MK |
317 | _exit(1); |
318 | } | |
319 | if (pwd->pw_uid) { | |
2a6b82aa | 320 | (void) setgid((gid_t)pwd->pw_gid); |
b1b30605 | 321 | initgroups(pwd->pw_name, pwd->pw_gid); |
2a6b82aa | 322 | (void) setuid((uid_t)pwd->pw_uid); |
b1b30605 | 323 | } |
b1b30605 MK |
324 | execv(sep->se_server, sep->se_argv); |
325 | if (sep->se_socktype != SOCK_STREAM) | |
326 | recv(0, buf, sizeof (buf), 0); | |
327 | syslog(LOG_ERR, "execv %s: %m", sep->se_server); | |
328 | _exit(1); | |
093d40e3 MK |
329 | } |
330 | } | |
331 | if (sep->se_socktype == SOCK_STREAM) | |
332 | close(ctrl); | |
21ed1185 | 333 | } |
21ed1185 MK |
334 | } |
335 | } | |
336 | ||
664e9651 | 337 | void |
21ed1185 MK |
338 | reapchild() |
339 | { | |
093d40e3 | 340 | int status; |
21ed1185 MK |
341 | int pid; |
342 | register struct servtab *sep; | |
343 | ||
344 | for (;;) { | |
093d40e3 | 345 | pid = wait3(&status, WNOHANG, (struct rusage *)0); |
21ed1185 MK |
346 | if (pid <= 0) |
347 | break; | |
348 | if (debug) | |
349 | fprintf(stderr, "%d reaped\n", pid); | |
350 | for (sep = servtab; sep; sep = sep->se_next) | |
351 | if (sep->se_wait == pid) { | |
093d40e3 | 352 | if (status) |
6a3125d9 RC |
353 | syslog(LOG_WARNING, |
354 | "%s: exit status 0x%x", | |
21ed1185 MK |
355 | sep->se_server, status); |
356 | if (debug) | |
357 | fprintf(stderr, "restored %s, fd %d\n", | |
358 | sep->se_service, sep->se_fd); | |
5859fc43 MK |
359 | FD_SET(sep->se_fd, &allsock); |
360 | nsock++; | |
21ed1185 MK |
361 | sep->se_wait = 1; |
362 | } | |
363 | } | |
364 | } | |
365 | ||
664e9651 | 366 | void |
21ed1185 MK |
367 | config() |
368 | { | |
369 | register struct servtab *sep, *cp, **sepp; | |
370 | struct servtab *getconfigent(), *enter(); | |
92732149 | 371 | long omask; |
21ed1185 MK |
372 | |
373 | if (!setconfig()) { | |
6a3125d9 | 374 | syslog(LOG_ERR, "%s: %m", CONFIG); |
21ed1185 MK |
375 | return; |
376 | } | |
377 | for (sep = servtab; sep; sep = sep->se_next) | |
378 | sep->se_checked = 0; | |
379 | while (cp = getconfigent()) { | |
380 | for (sep = servtab; sep; sep = sep->se_next) | |
381 | if (strcmp(sep->se_service, cp->se_service) == 0 && | |
382 | strcmp(sep->se_proto, cp->se_proto) == 0) | |
383 | break; | |
384 | if (sep != 0) { | |
385 | int i; | |
386 | ||
fc99bd8d | 387 | omask = sigblock(SIGBLOCK); |
90aae428 KB |
388 | /* |
389 | * sep->se_wait may be holding the pid of a daemon | |
390 | * that we're waiting for. If so, don't overwrite | |
391 | * it unless the config file explicitly says don't | |
392 | * wait. | |
393 | */ | |
394 | if (cp->se_bi == 0 && | |
395 | (sep->se_wait == 1 || cp->se_wait == 0)) | |
fc99bd8d | 396 | sep->se_wait = cp->se_wait; |
21ed1185 | 397 | #define SWAP(a, b) { char *c = a; a = b; b = c; } |
2a6b82aa JL |
398 | if (cp->se_user) |
399 | SWAP(sep->se_user, cp->se_user); | |
21ed1185 MK |
400 | if (cp->se_server) |
401 | SWAP(sep->se_server, cp->se_server); | |
402 | for (i = 0; i < MAXARGV; i++) | |
403 | SWAP(sep->se_argv[i], cp->se_argv[i]); | |
404 | sigsetmask(omask); | |
405 | freeconfig(cp); | |
9a0fbd5b MK |
406 | if (debug) |
407 | print_service("REDO", sep); | |
408 | } else { | |
21ed1185 | 409 | sep = enter(cp); |
9a0fbd5b MK |
410 | if (debug) |
411 | print_service("ADD ", sep); | |
412 | } | |
21ed1185 | 413 | sep->se_checked = 1; |
21ed1185 MK |
414 | sp = getservbyname(sep->se_service, sep->se_proto); |
415 | if (sp == 0) { | |
6a3125d9 | 416 | syslog(LOG_ERR, "%s/%s: unknown service", |
21ed1185 | 417 | sep->se_service, sep->se_proto); |
093d40e3 MK |
418 | if (sep->se_fd != -1) |
419 | (void) close(sep->se_fd); | |
420 | sep->se_fd = -1; | |
21ed1185 MK |
421 | continue; |
422 | } | |
fc99bd8d MK |
423 | if (sp->s_port != sep->se_ctrladdr.sin_port) { |
424 | sep->se_ctrladdr.sin_port = sp->s_port; | |
425 | if (sep->se_fd != -1) | |
426 | (void) close(sep->se_fd); | |
427 | sep->se_fd = -1; | |
21ed1185 | 428 | } |
fc99bd8d MK |
429 | if (sep->se_fd == -1) |
430 | setup(sep); | |
21ed1185 MK |
431 | } |
432 | endconfig(); | |
433 | /* | |
434 | * Purge anything not looked at above. | |
435 | */ | |
fc99bd8d | 436 | omask = sigblock(SIGBLOCK); |
21ed1185 MK |
437 | sepp = &servtab; |
438 | while (sep = *sepp) { | |
439 | if (sep->se_checked) { | |
440 | sepp = &sep->se_next; | |
441 | continue; | |
442 | } | |
443 | *sepp = sep->se_next; | |
444 | if (sep->se_fd != -1) { | |
5859fc43 MK |
445 | FD_CLR(sep->se_fd, &allsock); |
446 | nsock--; | |
21ed1185 MK |
447 | (void) close(sep->se_fd); |
448 | } | |
9a0fbd5b MK |
449 | if (debug) |
450 | print_service("FREE", sep); | |
21ed1185 MK |
451 | freeconfig(sep); |
452 | free((char *)sep); | |
453 | } | |
454 | (void) sigsetmask(omask); | |
455 | } | |
456 | ||
664e9651 | 457 | void |
fc99bd8d MK |
458 | retry() |
459 | { | |
460 | register struct servtab *sep; | |
461 | ||
462 | timingout = 0; | |
463 | for (sep = servtab; sep; sep = sep->se_next) | |
464 | if (sep->se_fd == -1) | |
465 | setup(sep); | |
466 | } | |
467 | ||
468 | setup(sep) | |
469 | register struct servtab *sep; | |
470 | { | |
471 | int on = 1; | |
472 | ||
473 | if ((sep->se_fd = socket(AF_INET, sep->se_socktype, 0)) < 0) { | |
474 | syslog(LOG_ERR, "%s/%s: socket: %m", | |
475 | sep->se_service, sep->se_proto); | |
476 | return; | |
477 | } | |
478 | #define turnon(fd, opt) \ | |
479 | setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) | |
480 | if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && | |
481 | turnon(sep->se_fd, SO_DEBUG) < 0) | |
482 | syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); | |
483 | if (turnon(sep->se_fd, SO_REUSEADDR) < 0) | |
484 | syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); | |
485 | #undef turnon | |
95236f21 | 486 | if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr, |
fc99bd8d MK |
487 | sizeof (sep->se_ctrladdr)) < 0) { |
488 | syslog(LOG_ERR, "%s/%s: bind: %m", | |
489 | sep->se_service, sep->se_proto); | |
490 | (void) close(sep->se_fd); | |
491 | sep->se_fd = -1; | |
492 | if (!timingout) { | |
493 | timingout = 1; | |
494 | alarm(RETRYTIME); | |
495 | } | |
496 | return; | |
497 | } | |
498 | if (sep->se_socktype == SOCK_STREAM) | |
499 | listen(sep->se_fd, 10); | |
500 | FD_SET(sep->se_fd, &allsock); | |
501 | nsock++; | |
502 | if (sep->se_fd > maxsock) | |
503 | maxsock = sep->se_fd; | |
504 | } | |
505 | ||
21ed1185 MK |
506 | struct servtab * |
507 | enter(cp) | |
508 | struct servtab *cp; | |
509 | { | |
510 | register struct servtab *sep; | |
92732149 | 511 | long omask; |
21ed1185 MK |
512 | |
513 | sep = (struct servtab *)malloc(sizeof (*sep)); | |
514 | if (sep == (struct servtab *)0) { | |
6a3125d9 | 515 | syslog(LOG_ERR, "Out of memory."); |
21ed1185 MK |
516 | exit(-1); |
517 | } | |
518 | *sep = *cp; | |
519 | sep->se_fd = -1; | |
fc99bd8d | 520 | omask = sigblock(SIGBLOCK); |
21ed1185 MK |
521 | sep->se_next = servtab; |
522 | servtab = sep; | |
523 | sigsetmask(omask); | |
524 | return (sep); | |
525 | } | |
526 | ||
527 | FILE *fconfig = NULL; | |
528 | struct servtab serv; | |
529 | char line[256]; | |
530 | char *skip(), *nextline(); | |
531 | ||
532 | setconfig() | |
533 | { | |
534 | ||
535 | if (fconfig != NULL) { | |
2a6b82aa | 536 | fseek(fconfig, 0L, L_SET); |
21ed1185 MK |
537 | return (1); |
538 | } | |
539 | fconfig = fopen(CONFIG, "r"); | |
540 | return (fconfig != NULL); | |
541 | } | |
542 | ||
543 | endconfig() | |
544 | { | |
567752b5 KB |
545 | if (fconfig) { |
546 | (void) fclose(fconfig); | |
547 | fconfig = NULL; | |
548 | } | |
21ed1185 MK |
549 | } |
550 | ||
551 | struct servtab * | |
552 | getconfigent() | |
553 | { | |
554 | register struct servtab *sep = &serv; | |
21ed1185 | 555 | int argc; |
95236f21 | 556 | char *cp, *arg, *newstr(); |
21ed1185 | 557 | |
b1b30605 | 558 | more: |
21ed1185 MK |
559 | while ((cp = nextline(fconfig)) && *cp == '#') |
560 | ; | |
561 | if (cp == NULL) | |
562 | return ((struct servtab *)0); | |
95236f21 | 563 | sep->se_service = newstr(skip(&cp)); |
21ed1185 MK |
564 | arg = skip(&cp); |
565 | if (strcmp(arg, "stream") == 0) | |
566 | sep->se_socktype = SOCK_STREAM; | |
567 | else if (strcmp(arg, "dgram") == 0) | |
568 | sep->se_socktype = SOCK_DGRAM; | |
569 | else if (strcmp(arg, "rdm") == 0) | |
570 | sep->se_socktype = SOCK_RDM; | |
571 | else if (strcmp(arg, "seqpacket") == 0) | |
572 | sep->se_socktype = SOCK_SEQPACKET; | |
573 | else if (strcmp(arg, "raw") == 0) | |
574 | sep->se_socktype = SOCK_RAW; | |
575 | else | |
576 | sep->se_socktype = -1; | |
95236f21 | 577 | sep->se_proto = newstr(skip(&cp)); |
21ed1185 MK |
578 | arg = skip(&cp); |
579 | sep->se_wait = strcmp(arg, "wait") == 0; | |
95236f21 KB |
580 | sep->se_user = newstr(skip(&cp)); |
581 | sep->se_server = newstr(skip(&cp)); | |
b1b30605 MK |
582 | if (strcmp(sep->se_server, "internal") == 0) { |
583 | register struct biltin *bi; | |
584 | ||
585 | for (bi = biltins; bi->bi_service; bi++) | |
586 | if (bi->bi_socktype == sep->se_socktype && | |
587 | strcmp(bi->bi_service, sep->se_service) == 0) | |
588 | break; | |
589 | if (bi->bi_service == 0) { | |
590 | syslog(LOG_ERR, "internal service %s unknown\n", | |
591 | sep->se_service); | |
592 | goto more; | |
593 | } | |
594 | sep->se_bi = bi; | |
595 | sep->se_wait = bi->bi_wait; | |
9a0fbd5b MK |
596 | } else |
597 | sep->se_bi = NULL; | |
21ed1185 MK |
598 | argc = 0; |
599 | for (arg = skip(&cp); cp; arg = skip(&cp)) | |
600 | if (argc < MAXARGV) | |
95236f21 | 601 | sep->se_argv[argc++] = newstr(arg); |
21ed1185 MK |
602 | while (argc <= MAXARGV) |
603 | sep->se_argv[argc++] = NULL; | |
604 | return (sep); | |
605 | } | |
606 | ||
607 | freeconfig(cp) | |
608 | register struct servtab *cp; | |
609 | { | |
610 | int i; | |
611 | ||
612 | if (cp->se_service) | |
613 | free(cp->se_service); | |
614 | if (cp->se_proto) | |
615 | free(cp->se_proto); | |
2a6b82aa JL |
616 | if (cp->se_user) |
617 | free(cp->se_user); | |
21ed1185 MK |
618 | if (cp->se_server) |
619 | free(cp->se_server); | |
620 | for (i = 0; i < MAXARGV; i++) | |
621 | if (cp->se_argv[i]) | |
622 | free(cp->se_argv[i]); | |
623 | } | |
624 | ||
625 | char * | |
626 | skip(cpp) | |
627 | char **cpp; | |
628 | { | |
629 | register char *cp = *cpp; | |
630 | char *start; | |
631 | ||
632 | again: | |
633 | while (*cp == ' ' || *cp == '\t') | |
634 | cp++; | |
635 | if (*cp == '\0') { | |
4650c563 | 636 | int c; |
21ed1185 MK |
637 | |
638 | c = getc(fconfig); | |
567752b5 | 639 | (void) ungetc(c, fconfig); |
21ed1185 MK |
640 | if (c == ' ' || c == '\t') |
641 | if (cp = nextline(fconfig)) | |
642 | goto again; | |
643 | *cpp = (char *)0; | |
644 | return ((char *)0); | |
645 | } | |
646 | start = cp; | |
647 | while (*cp && *cp != ' ' && *cp != '\t') | |
648 | cp++; | |
649 | if (*cp != '\0') | |
650 | *cp++ = '\0'; | |
651 | *cpp = cp; | |
652 | return (start); | |
653 | } | |
654 | ||
655 | char * | |
656 | nextline(fd) | |
657 | FILE *fd; | |
658 | { | |
659 | char *cp; | |
660 | ||
2a6b82aa | 661 | if (fgets(line, sizeof (line), fd) == NULL) |
21ed1185 MK |
662 | return ((char *)0); |
663 | cp = index(line, '\n'); | |
664 | if (cp) | |
665 | *cp = '\0'; | |
666 | return (line); | |
667 | } | |
668 | ||
669 | char * | |
95236f21 | 670 | newstr(cp) |
21ed1185 MK |
671 | char *cp; |
672 | { | |
093d40e3 | 673 | if (cp = strdup(cp ? cp : "")) |
95236f21 | 674 | return(cp); |
093d40e3 | 675 | syslog(LOG_ERR, "strdup: %m"); |
95236f21 | 676 | exit(-1); |
21ed1185 | 677 | } |
b1b30605 MK |
678 | |
679 | setproctitle(a, s) | |
680 | char *a; | |
681 | int s; | |
682 | { | |
683 | int size; | |
684 | register char *cp; | |
685 | struct sockaddr_in sin; | |
686 | char buf[80]; | |
687 | ||
688 | cp = Argv[0]; | |
689 | size = sizeof(sin); | |
95236f21 | 690 | if (getpeername(s, (struct sockaddr *)&sin, &size) == 0) |
9bd38ba8 | 691 | (void) sprintf(buf, "-%s [%s]", a, inet_ntoa(sin.sin_addr)); |
b1b30605 | 692 | else |
9bd38ba8 | 693 | (void) sprintf(buf, "-%s", a); |
b1b30605 MK |
694 | strncpy(cp, buf, LastArg - cp); |
695 | cp += strlen(cp); | |
696 | while (cp < LastArg) | |
697 | *cp++ = ' '; | |
698 | } | |
699 | ||
700 | /* | |
701 | * Internet services provided internally by inetd: | |
702 | */ | |
a1fe6118 | 703 | #define BUFSIZE 8192 |
b1b30605 MK |
704 | |
705 | /* ARGSUSED */ | |
706 | echo_stream(s, sep) /* Echo service -- echo data back */ | |
707 | int s; | |
708 | struct servtab *sep; | |
709 | { | |
b9c70736 | 710 | char buffer[BUFSIZE]; |
b1b30605 MK |
711 | int i; |
712 | ||
0ee95e67 | 713 | setproctitle(sep->se_service, s); |
b1b30605 MK |
714 | while ((i = read(s, buffer, sizeof(buffer))) > 0 && |
715 | write(s, buffer, i) > 0) | |
716 | ; | |
717 | exit(0); | |
718 | } | |
719 | ||
720 | /* ARGSUSED */ | |
721 | echo_dg(s, sep) /* Echo service -- echo data back */ | |
722 | int s; | |
723 | struct servtab *sep; | |
724 | { | |
b9c70736 | 725 | char buffer[BUFSIZE]; |
b1b30605 MK |
726 | int i, size; |
727 | struct sockaddr sa; | |
728 | ||
729 | size = sizeof(sa); | |
730 | if ((i = recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size)) < 0) | |
731 | return; | |
732 | (void) sendto(s, buffer, i, 0, &sa, sizeof(sa)); | |
733 | } | |
734 | ||
735 | /* ARGSUSED */ | |
736 | discard_stream(s, sep) /* Discard service -- ignore data */ | |
737 | int s; | |
738 | struct servtab *sep; | |
739 | { | |
a1fe6118 | 740 | int ret; |
b9c70736 | 741 | char buffer[BUFSIZE]; |
b1b30605 | 742 | |
0ee95e67 | 743 | setproctitle(sep->se_service, s); |
b1b30605 | 744 | while (1) { |
a1fe6118 | 745 | while ((ret = read(s, buffer, sizeof(buffer))) > 0) |
b1b30605 | 746 | ; |
a1fe6118 | 747 | if (ret == 0 || errno != EINTR) |
b1b30605 MK |
748 | break; |
749 | } | |
750 | exit(0); | |
751 | } | |
752 | ||
753 | /* ARGSUSED */ | |
754 | discard_dg(s, sep) /* Discard service -- ignore data */ | |
755 | int s; | |
756 | struct servtab *sep; | |
757 | { | |
b9c70736 | 758 | char buffer[BUFSIZE]; |
b1b30605 MK |
759 | |
760 | (void) read(s, buffer, sizeof(buffer)); | |
761 | } | |
762 | ||
763 | #include <ctype.h> | |
764 | #define LINESIZ 72 | |
765 | char ring[128]; | |
766 | char *endring; | |
767 | ||
768 | initring() | |
769 | { | |
770 | register int i; | |
771 | ||
772 | endring = ring; | |
773 | ||
774 | for (i = 0; i <= 128; ++i) | |
775 | if (isprint(i)) | |
776 | *endring++ = i; | |
777 | } | |
778 | ||
779 | /* ARGSUSED */ | |
780 | chargen_stream(s, sep) /* Character generator */ | |
781 | int s; | |
782 | struct servtab *sep; | |
783 | { | |
92732149 KB |
784 | register char *rs; |
785 | int len; | |
b1b30605 | 786 | char text[LINESIZ+2]; |
b1b30605 | 787 | |
0ee95e67 | 788 | setproctitle(sep->se_service, s); |
92732149 KB |
789 | |
790 | if (!endring) { | |
b1b30605 | 791 | initring(); |
92732149 KB |
792 | rs = ring; |
793 | } | |
b1b30605 | 794 | |
92732149 KB |
795 | text[LINESIZ] = '\r'; |
796 | text[LINESIZ + 1] = '\n'; | |
797 | for (rs = ring;;) { | |
798 | if ((len = endring - rs) >= LINESIZ) | |
799 | bcopy(rs, text, LINESIZ); | |
800 | else { | |
801 | bcopy(rs, text, len); | |
802 | bcopy(ring, text + len, LINESIZ - len); | |
b1b30605 | 803 | } |
92732149 KB |
804 | if (++rs == endring) |
805 | rs = ring; | |
806 | if (write(s, text, sizeof(text)) != sizeof(text)) | |
b1b30605 MK |
807 | break; |
808 | } | |
809 | exit(0); | |
810 | } | |
811 | ||
812 | /* ARGSUSED */ | |
813 | chargen_dg(s, sep) /* Character generator */ | |
814 | int s; | |
815 | struct servtab *sep; | |
816 | { | |
b1b30605 | 817 | struct sockaddr sa; |
92732149 KB |
818 | static char *rs; |
819 | int len, size; | |
820 | char text[LINESIZ+2]; | |
b1b30605 | 821 | |
92732149 | 822 | if (endring == 0) { |
b1b30605 | 823 | initring(); |
92732149 KB |
824 | rs = ring; |
825 | } | |
b1b30605 MK |
826 | |
827 | size = sizeof(sa); | |
828 | if (recvfrom(s, text, sizeof(text), 0, &sa, &size) < 0) | |
829 | return; | |
b1b30605 | 830 | |
92732149 KB |
831 | if ((len = endring - rs) >= LINESIZ) |
832 | bcopy(rs, text, LINESIZ); | |
833 | else { | |
834 | bcopy(rs, text, len); | |
835 | bcopy(ring, text + len, LINESIZ - len); | |
836 | } | |
837 | if (++rs == endring) | |
838 | rs = ring; | |
839 | text[LINESIZ] = '\r'; | |
840 | text[LINESIZ + 1] = '\n'; | |
b1b30605 MK |
841 | (void) sendto(s, text, sizeof(text), 0, &sa, sizeof(sa)); |
842 | } | |
843 | ||
844 | /* | |
845 | * Return a machine readable date and time, in the form of the | |
846 | * number of seconds since midnight, Jan 1, 1900. Since gettimeofday | |
847 | * returns the number of seconds since midnight, Jan 1, 1970, | |
848 | * we must add 2208988800 seconds to this figure to make up for | |
849 | * some seventy years Bell Labs was asleep. | |
850 | */ | |
b1b30605 MK |
851 | |
852 | long | |
853 | machtime() | |
854 | { | |
855 | struct timeval tv; | |
856 | ||
2a6b82aa | 857 | if (gettimeofday(&tv, (struct timezone *)0) < 0) { |
b1b30605 | 858 | fprintf(stderr, "Unable to get time of day\n"); |
2a6b82aa | 859 | return (0L); |
b1b30605 MK |
860 | } |
861 | return (htonl((long)tv.tv_sec + 2208988800)); | |
862 | } | |
863 | ||
864 | /* ARGSUSED */ | |
865 | machtime_stream(s, sep) | |
866 | int s; | |
867 | struct servtab *sep; | |
868 | { | |
869 | long result; | |
870 | ||
871 | result = machtime(); | |
872 | (void) write(s, (char *) &result, sizeof(result)); | |
873 | } | |
874 | ||
875 | /* ARGSUSED */ | |
876 | machtime_dg(s, sep) | |
877 | int s; | |
878 | struct servtab *sep; | |
879 | { | |
880 | long result; | |
881 | struct sockaddr sa; | |
882 | int size; | |
883 | ||
884 | size = sizeof(sa); | |
2a6b82aa | 885 | if (recvfrom(s, (char *)&result, sizeof(result), 0, &sa, &size) < 0) |
b1b30605 MK |
886 | return; |
887 | result = machtime(); | |
888 | (void) sendto(s, (char *) &result, sizeof(result), 0, &sa, sizeof(sa)); | |
889 | } | |
890 | ||
891 | /* ARGSUSED */ | |
892 | daytime_stream(s, sep) /* Return human-readable time of day */ | |
893 | int s; | |
894 | struct servtab *sep; | |
895 | { | |
896 | char buffer[256]; | |
897 | time_t time(), clock; | |
898 | char *ctime(); | |
899 | ||
900 | clock = time((time_t *) 0); | |
901 | ||
9bd38ba8 | 902 | (void) sprintf(buffer, "%.24s\r\n", ctime(&clock)); |
2a6b82aa | 903 | (void) write(s, buffer, strlen(buffer)); |
b1b30605 MK |
904 | } |
905 | ||
906 | /* ARGSUSED */ | |
907 | daytime_dg(s, sep) /* Return human-readable time of day */ | |
908 | int s; | |
909 | struct servtab *sep; | |
910 | { | |
911 | char buffer[256]; | |
912 | time_t time(), clock; | |
913 | struct sockaddr sa; | |
914 | int size; | |
915 | char *ctime(); | |
916 | ||
917 | clock = time((time_t *) 0); | |
918 | ||
919 | size = sizeof(sa); | |
920 | if (recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size) < 0) | |
921 | return; | |
9bd38ba8 | 922 | (void) sprintf(buffer, "%.24s\r\n", ctime(&clock)); |
b1b30605 MK |
923 | (void) sendto(s, buffer, strlen(buffer), 0, &sa, sizeof(sa)); |
924 | } | |
9a0fbd5b MK |
925 | |
926 | /* | |
927 | * print_service: | |
928 | * Dump relevant information to stderr | |
929 | */ | |
930 | print_service(action, sep) | |
931 | char *action; | |
932 | struct servtab *sep; | |
933 | { | |
934 | fprintf(stderr, | |
935 | "%s: %s proto=%s, wait=%d, user=%s builtin=%x server=%s\n", | |
936 | action, sep->se_service, sep->se_proto, | |
567752b5 | 937 | sep->se_wait, sep->se_user, (int)sep->se_bi, sep->se_server); |
9a0fbd5b | 938 | } |