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e17285c7 WJ |
1 | /* |
2 | * Copyright (c) 1983,1991 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | */ | |
33 | ||
34 | #ifndef lint | |
35 | char copyright[] = | |
36 | "@(#) Copyright (c) 1983 Regents of the University of California.\n\ | |
37 | All rights reserved.\n"; | |
38 | #endif /* not lint */ | |
39 | ||
40 | #ifndef lint | |
41 | static char sccsid[] = "@(#)inetd.c 5.30 (Berkeley) 6/3/91"; | |
42 | #endif /* not lint */ | |
43 | ||
44 | /* | |
45 | * Inetd - Internet super-server | |
46 | * | |
47 | * This program invokes all internet services as needed. | |
48 | * connection-oriented services are invoked each time a | |
49 | * connection is made, by creating a process. This process | |
50 | * is passed the connection as file descriptor 0 and is | |
51 | * expected to do a getpeername to find out the source host | |
52 | * and port. | |
53 | * | |
54 | * Datagram oriented services are invoked when a datagram | |
55 | * arrives; a process is created and passed a pending message | |
56 | * on file descriptor 0. Datagram servers may either connect | |
57 | * to their peer, freeing up the original socket for inetd | |
58 | * to receive further messages on, or ``take over the socket'', | |
59 | * processing all arriving datagrams and, eventually, timing | |
60 | * out. The first type of server is said to be ``multi-threaded''; | |
61 | * the second type of server ``single-threaded''. | |
62 | * | |
63 | * Inetd uses a configuration file which is read at startup | |
64 | * and, possibly, at some later time in response to a hangup signal. | |
65 | * The configuration file is ``free format'' with fields given in the | |
66 | * order shown below. Continuation lines for an entry must being with | |
67 | * a space or tab. All fields must be present in each entry. | |
68 | * | |
69 | * service name must be in /etc/services | |
70 | * socket type stream/dgram/raw/rdm/seqpacket | |
71 | * protocol must be in /etc/protocols | |
72 | * wait/nowait single-threaded/multi-threaded | |
73 | * user user to run daemon as | |
74 | * server program full path name | |
75 | * server program arguments maximum of MAXARGS (20) | |
76 | * | |
77 | * Comment lines are indicated by a `#' in column 1. | |
78 | */ | |
79 | #include <sys/param.h> | |
80 | #include <sys/stat.h> | |
81 | #include <sys/ioctl.h> | |
82 | #include <sys/socket.h> | |
83 | #include <sys/file.h> | |
84 | #include <sys/wait.h> | |
85 | #include <sys/time.h> | |
86 | #include <sys/resource.h> | |
87 | ||
88 | #include <netinet/in.h> | |
89 | #include <arpa/inet.h> | |
90 | ||
91 | #include <errno.h> | |
92 | #include <signal.h> | |
93 | #include <netdb.h> | |
94 | #include <syslog.h> | |
95 | #include <pwd.h> | |
96 | #include <stdio.h> | |
97 | #include <string.h> | |
98 | #include "pathnames.h" | |
99 | ||
100 | #define TOOMANY 40 /* don't start more than TOOMANY */ | |
101 | #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */ | |
102 | #define RETRYTIME (60*10) /* retry after bind or server fail */ | |
103 | ||
104 | #define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM)) | |
105 | ||
106 | extern int errno; | |
107 | ||
108 | void config(), reapchild(), retry(); | |
109 | char *index(); | |
110 | char *malloc(); | |
111 | ||
112 | int debug = 0; | |
113 | int nsock, maxsock; | |
114 | fd_set allsock; | |
115 | int options; | |
116 | int timingout; | |
117 | struct servent *sp; | |
118 | ||
119 | struct servtab { | |
120 | char *se_service; /* name of service */ | |
121 | int se_socktype; /* type of socket to use */ | |
122 | char *se_proto; /* protocol used */ | |
123 | short se_wait; /* single threaded server */ | |
124 | short se_checked; /* looked at during merge */ | |
125 | char *se_user; /* user name to run as */ | |
126 | struct biltin *se_bi; /* if built-in, description */ | |
127 | char *se_server; /* server program */ | |
128 | #define MAXARGV 20 | |
129 | char *se_argv[MAXARGV+1]; /* program arguments */ | |
130 | int se_fd; /* open descriptor */ | |
131 | struct sockaddr_in se_ctrladdr;/* bound address */ | |
132 | int se_count; /* number started since se_time */ | |
133 | struct timeval se_time; /* start of se_count */ | |
134 | struct servtab *se_next; | |
135 | } *servtab; | |
136 | ||
137 | int echo_stream(), discard_stream(), machtime_stream(); | |
138 | int daytime_stream(), chargen_stream(); | |
139 | int echo_dg(), discard_dg(), machtime_dg(), daytime_dg(), chargen_dg(); | |
140 | ||
141 | struct biltin { | |
142 | char *bi_service; /* internally provided service name */ | |
143 | int bi_socktype; /* type of socket supported */ | |
144 | short bi_fork; /* 1 if should fork before call */ | |
145 | short bi_wait; /* 1 if should wait for child */ | |
146 | int (*bi_fn)(); /* function which performs it */ | |
147 | } biltins[] = { | |
148 | /* Echo received data */ | |
149 | "echo", SOCK_STREAM, 1, 0, echo_stream, | |
150 | "echo", SOCK_DGRAM, 0, 0, echo_dg, | |
151 | ||
152 | /* Internet /dev/null */ | |
153 | "discard", SOCK_STREAM, 1, 0, discard_stream, | |
154 | "discard", SOCK_DGRAM, 0, 0, discard_dg, | |
155 | ||
156 | /* Return 32 bit time since 1970 */ | |
157 | "time", SOCK_STREAM, 0, 0, machtime_stream, | |
158 | "time", SOCK_DGRAM, 0, 0, machtime_dg, | |
159 | ||
160 | /* Return human-readable time */ | |
161 | "daytime", SOCK_STREAM, 0, 0, daytime_stream, | |
162 | "daytime", SOCK_DGRAM, 0, 0, daytime_dg, | |
163 | ||
164 | /* Familiar character generator */ | |
165 | "chargen", SOCK_STREAM, 1, 0, chargen_stream, | |
166 | "chargen", SOCK_DGRAM, 0, 0, chargen_dg, | |
167 | 0 | |
168 | }; | |
169 | ||
170 | #define NUMINT (sizeof(intab) / sizeof(struct inent)) | |
171 | char *CONFIG = _PATH_INETDCONF; | |
172 | char **Argv; | |
173 | char *LastArg; | |
174 | ||
175 | main(argc, argv, envp) | |
176 | int argc; | |
177 | char *argv[], *envp[]; | |
178 | { | |
179 | extern char *optarg; | |
180 | extern int optind; | |
181 | register struct servtab *sep; | |
182 | register struct passwd *pwd; | |
183 | register int tmpint; | |
184 | struct sigvec sv; | |
185 | int ch, pid, dofork; | |
186 | char buf[50]; | |
187 | ||
188 | Argv = argv; | |
189 | if (envp == 0 || *envp == 0) | |
190 | envp = argv; | |
191 | while (*envp) | |
192 | envp++; | |
193 | LastArg = envp[-1] + strlen(envp[-1]); | |
194 | ||
195 | while ((ch = getopt(argc, argv, "d")) != EOF) | |
196 | switch(ch) { | |
197 | case 'd': | |
198 | debug = 1; | |
199 | options |= SO_DEBUG; | |
200 | break; | |
201 | case '?': | |
202 | default: | |
203 | fprintf(stderr, "usage: inetd [-d]"); | |
204 | exit(1); | |
205 | } | |
206 | argc -= optind; | |
207 | argv += optind; | |
208 | ||
209 | if (argc > 0) | |
210 | CONFIG = argv[0]; | |
211 | if (debug == 0) | |
212 | daemon(0, 0); | |
213 | openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON); | |
214 | bzero((char *)&sv, sizeof(sv)); | |
215 | sv.sv_mask = SIGBLOCK; | |
216 | sv.sv_handler = retry; | |
217 | sigvec(SIGALRM, &sv, (struct sigvec *)0); | |
218 | config(); | |
219 | sv.sv_handler = config; | |
220 | sigvec(SIGHUP, &sv, (struct sigvec *)0); | |
221 | sv.sv_handler = reapchild; | |
222 | sigvec(SIGCHLD, &sv, (struct sigvec *)0); | |
223 | ||
224 | { | |
225 | /* space for daemons to overwrite environment for ps */ | |
226 | #define DUMMYSIZE 100 | |
227 | char dummy[DUMMYSIZE]; | |
228 | ||
229 | (void)memset(dummy, 'x', sizeof(DUMMYSIZE) - 1); | |
230 | dummy[DUMMYSIZE - 1] = '\0'; | |
231 | (void)setenv("inetd_dummy", dummy, 1); | |
232 | } | |
233 | ||
234 | for (;;) { | |
235 | int n, ctrl; | |
236 | fd_set readable; | |
237 | ||
238 | if (nsock == 0) { | |
239 | (void) sigblock(SIGBLOCK); | |
240 | while (nsock == 0) | |
241 | sigpause(0L); | |
242 | (void) sigsetmask(0L); | |
243 | } | |
244 | readable = allsock; | |
245 | if ((n = select(maxsock + 1, &readable, (fd_set *)0, | |
246 | (fd_set *)0, (struct timeval *)0)) <= 0) { | |
247 | if (n < 0 && errno != EINTR) | |
248 | syslog(LOG_WARNING, "select: %m\n"); | |
249 | sleep(1); | |
250 | continue; | |
251 | } | |
252 | for (sep = servtab; n && sep; sep = sep->se_next) | |
253 | if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) { | |
254 | n--; | |
255 | if (debug) | |
256 | fprintf(stderr, "someone wants %s\n", | |
257 | sep->se_service); | |
258 | if (sep->se_socktype == SOCK_STREAM) { | |
259 | ctrl = accept(sep->se_fd, (struct sockaddr *)0, | |
260 | (int *)0); | |
261 | if (debug) | |
262 | fprintf(stderr, "accept, ctrl %d\n", ctrl); | |
263 | if (ctrl < 0) { | |
264 | if (errno == EINTR) | |
265 | continue; | |
266 | syslog(LOG_WARNING, "accept (for %s): %m", | |
267 | sep->se_service); | |
268 | continue; | |
269 | } | |
270 | } else | |
271 | ctrl = sep->se_fd; | |
272 | (void) sigblock(SIGBLOCK); | |
273 | pid = 0; | |
274 | dofork = (sep->se_bi == 0 || sep->se_bi->bi_fork); | |
275 | if (dofork) { | |
276 | if (sep->se_count++ == 0) | |
277 | (void)gettimeofday(&sep->se_time, | |
278 | (struct timezone *)0); | |
279 | else if (sep->se_count >= TOOMANY) { | |
280 | struct timeval now; | |
281 | ||
282 | (void)gettimeofday(&now, (struct timezone *)0); | |
283 | if (now.tv_sec - sep->se_time.tv_sec > | |
284 | CNT_INTVL) { | |
285 | sep->se_time = now; | |
286 | sep->se_count = 1; | |
287 | } else { | |
288 | syslog(LOG_ERR, | |
289 | "%s/%s server failing (looping), service terminated\n", | |
290 | sep->se_service, sep->se_proto); | |
291 | FD_CLR(sep->se_fd, &allsock); | |
292 | (void) close(sep->se_fd); | |
293 | sep->se_fd = -1; | |
294 | sep->se_count = 0; | |
295 | nsock--; | |
296 | if (!timingout) { | |
297 | timingout = 1; | |
298 | alarm(RETRYTIME); | |
299 | } | |
300 | } | |
301 | } | |
302 | pid = fork(); | |
303 | } | |
304 | if (pid < 0) { | |
305 | syslog(LOG_ERR, "fork: %m"); | |
306 | if (sep->se_socktype == SOCK_STREAM) | |
307 | close(ctrl); | |
308 | sigsetmask(0L); | |
309 | sleep(1); | |
310 | continue; | |
311 | } | |
312 | if (pid && sep->se_wait) { | |
313 | sep->se_wait = pid; | |
314 | if (sep->se_fd >= 0) { | |
315 | FD_CLR(sep->se_fd, &allsock); | |
316 | nsock--; | |
317 | } | |
318 | } | |
319 | sigsetmask(0L); | |
320 | if (pid == 0) { | |
321 | if (debug && dofork) | |
322 | setsid(); | |
323 | if (dofork) | |
324 | for (tmpint = maxsock; --tmpint > 2; ) | |
325 | if (tmpint != ctrl) | |
326 | close(tmpint); | |
327 | if (sep->se_bi) | |
328 | (*sep->se_bi->bi_fn)(ctrl, sep); | |
329 | else { | |
330 | if (debug) | |
331 | fprintf(stderr, "%d execl %s\n", | |
332 | getpid(), sep->se_server); | |
333 | dup2(ctrl, 0); | |
334 | close(ctrl); | |
335 | dup2(0, 1); | |
336 | dup2(0, 2); | |
337 | if ((pwd = getpwnam(sep->se_user)) == NULL) { | |
338 | syslog(LOG_ERR, | |
339 | "getpwnam: %s: No such user", | |
340 | sep->se_user); | |
341 | if (sep->se_socktype != SOCK_STREAM) | |
342 | recv(0, buf, sizeof (buf), 0); | |
343 | _exit(1); | |
344 | } | |
345 | if (pwd->pw_uid) { | |
346 | (void) setgid((gid_t)pwd->pw_gid); | |
347 | initgroups(pwd->pw_name, pwd->pw_gid); | |
348 | (void) setuid((uid_t)pwd->pw_uid); | |
349 | } | |
350 | execv(sep->se_server, sep->se_argv); | |
351 | if (sep->se_socktype != SOCK_STREAM) | |
352 | recv(0, buf, sizeof (buf), 0); | |
353 | syslog(LOG_ERR, "execv %s: %m", sep->se_server); | |
354 | _exit(1); | |
355 | } | |
356 | } | |
357 | if (sep->se_socktype == SOCK_STREAM) | |
358 | close(ctrl); | |
359 | } | |
360 | } | |
361 | } | |
362 | ||
363 | void | |
364 | reapchild() | |
365 | { | |
366 | int status; | |
367 | int pid; | |
368 | register struct servtab *sep; | |
369 | ||
370 | for (;;) { | |
371 | pid = wait3(&status, WNOHANG, (struct rusage *)0); | |
372 | if (pid <= 0) | |
373 | break; | |
374 | if (debug) | |
375 | fprintf(stderr, "%d reaped\n", pid); | |
376 | for (sep = servtab; sep; sep = sep->se_next) | |
377 | if (sep->se_wait == pid) { | |
378 | if (status) | |
379 | syslog(LOG_WARNING, | |
380 | "%s: exit status 0x%x", | |
381 | sep->se_server, status); | |
382 | if (debug) | |
383 | fprintf(stderr, "restored %s, fd %d\n", | |
384 | sep->se_service, sep->se_fd); | |
385 | FD_SET(sep->se_fd, &allsock); | |
386 | nsock++; | |
387 | sep->se_wait = 1; | |
388 | } | |
389 | } | |
390 | } | |
391 | ||
392 | void | |
393 | config() | |
394 | { | |
395 | register struct servtab *sep, *cp, **sepp; | |
396 | struct servtab *getconfigent(), *enter(); | |
397 | long omask; | |
398 | ||
399 | if (!setconfig()) { | |
400 | syslog(LOG_ERR, "%s: %m", CONFIG); | |
401 | return; | |
402 | } | |
403 | for (sep = servtab; sep; sep = sep->se_next) | |
404 | sep->se_checked = 0; | |
405 | while (cp = getconfigent()) { | |
406 | for (sep = servtab; sep; sep = sep->se_next) | |
407 | if (strcmp(sep->se_service, cp->se_service) == 0 && | |
408 | strcmp(sep->se_proto, cp->se_proto) == 0) | |
409 | break; | |
410 | if (sep != 0) { | |
411 | int i; | |
412 | ||
413 | omask = sigblock(SIGBLOCK); | |
414 | /* | |
415 | * sep->se_wait may be holding the pid of a daemon | |
416 | * that we're waiting for. If so, don't overwrite | |
417 | * it unless the config file explicitly says don't | |
418 | * wait. | |
419 | */ | |
420 | if (cp->se_bi == 0 && | |
421 | (sep->se_wait == 1 || cp->se_wait == 0)) | |
422 | sep->se_wait = cp->se_wait; | |
423 | #define SWAP(a, b) { char *c = a; a = b; b = c; } | |
424 | if (cp->se_user) | |
425 | SWAP(sep->se_user, cp->se_user); | |
426 | if (cp->se_server) | |
427 | SWAP(sep->se_server, cp->se_server); | |
428 | for (i = 0; i < MAXARGV; i++) | |
429 | SWAP(sep->se_argv[i], cp->se_argv[i]); | |
430 | sigsetmask(omask); | |
431 | freeconfig(cp); | |
432 | if (debug) | |
433 | print_service("REDO", sep); | |
434 | } else { | |
435 | sep = enter(cp); | |
436 | if (debug) | |
437 | print_service("ADD ", sep); | |
438 | } | |
439 | sep->se_checked = 1; | |
440 | sp = getservbyname(sep->se_service, sep->se_proto); | |
441 | if (sp == 0) { | |
442 | syslog(LOG_ERR, "%s/%s: unknown service", | |
443 | sep->se_service, sep->se_proto); | |
444 | if (sep->se_fd != -1) | |
445 | (void) close(sep->se_fd); | |
446 | sep->se_fd = -1; | |
447 | continue; | |
448 | } | |
449 | if (sp->s_port != sep->se_ctrladdr.sin_port) { | |
450 | sep->se_ctrladdr.sin_port = sp->s_port; | |
451 | if (sep->se_fd != -1) | |
452 | (void) close(sep->se_fd); | |
453 | sep->se_fd = -1; | |
454 | } | |
455 | if (sep->se_fd == -1) | |
456 | setup(sep); | |
457 | } | |
458 | endconfig(); | |
459 | /* | |
460 | * Purge anything not looked at above. | |
461 | */ | |
462 | omask = sigblock(SIGBLOCK); | |
463 | sepp = &servtab; | |
464 | while (sep = *sepp) { | |
465 | if (sep->se_checked) { | |
466 | sepp = &sep->se_next; | |
467 | continue; | |
468 | } | |
469 | *sepp = sep->se_next; | |
470 | if (sep->se_fd != -1) { | |
471 | FD_CLR(sep->se_fd, &allsock); | |
472 | nsock--; | |
473 | (void) close(sep->se_fd); | |
474 | } | |
475 | if (debug) | |
476 | print_service("FREE", sep); | |
477 | freeconfig(sep); | |
478 | free((char *)sep); | |
479 | } | |
480 | (void) sigsetmask(omask); | |
481 | } | |
482 | ||
483 | void | |
484 | retry() | |
485 | { | |
486 | register struct servtab *sep; | |
487 | ||
488 | timingout = 0; | |
489 | for (sep = servtab; sep; sep = sep->se_next) | |
490 | if (sep->se_fd == -1) | |
491 | setup(sep); | |
492 | } | |
493 | ||
494 | setup(sep) | |
495 | register struct servtab *sep; | |
496 | { | |
497 | int on = 1; | |
498 | ||
499 | if ((sep->se_fd = socket(AF_INET, sep->se_socktype, 0)) < 0) { | |
500 | syslog(LOG_ERR, "%s/%s: socket: %m", | |
501 | sep->se_service, sep->se_proto); | |
502 | return; | |
503 | } | |
504 | #define turnon(fd, opt) \ | |
505 | setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) | |
506 | if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && | |
507 | turnon(sep->se_fd, SO_DEBUG) < 0) | |
508 | syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); | |
509 | if (turnon(sep->se_fd, SO_REUSEADDR) < 0) | |
510 | syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); | |
511 | #undef turnon | |
512 | if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr, | |
513 | sizeof (sep->se_ctrladdr)) < 0) { | |
514 | syslog(LOG_ERR, "%s/%s: bind: %m", | |
515 | sep->se_service, sep->se_proto); | |
516 | (void) close(sep->se_fd); | |
517 | sep->se_fd = -1; | |
518 | if (!timingout) { | |
519 | timingout = 1; | |
520 | alarm(RETRYTIME); | |
521 | } | |
522 | return; | |
523 | } | |
524 | if (sep->se_socktype == SOCK_STREAM) | |
525 | listen(sep->se_fd, 10); | |
526 | FD_SET(sep->se_fd, &allsock); | |
527 | nsock++; | |
528 | if (sep->se_fd > maxsock) | |
529 | maxsock = sep->se_fd; | |
530 | } | |
531 | ||
532 | struct servtab * | |
533 | enter(cp) | |
534 | struct servtab *cp; | |
535 | { | |
536 | register struct servtab *sep; | |
537 | long omask; | |
538 | ||
539 | sep = (struct servtab *)malloc(sizeof (*sep)); | |
540 | if (sep == (struct servtab *)0) { | |
541 | syslog(LOG_ERR, "Out of memory."); | |
542 | exit(-1); | |
543 | } | |
544 | *sep = *cp; | |
545 | sep->se_fd = -1; | |
546 | omask = sigblock(SIGBLOCK); | |
547 | sep->se_next = servtab; | |
548 | servtab = sep; | |
549 | sigsetmask(omask); | |
550 | return (sep); | |
551 | } | |
552 | ||
553 | FILE *fconfig = NULL; | |
554 | struct servtab serv; | |
555 | char line[256]; | |
556 | char *skip(), *nextline(); | |
557 | ||
558 | setconfig() | |
559 | { | |
560 | ||
561 | if (fconfig != NULL) { | |
562 | fseek(fconfig, 0L, L_SET); | |
563 | return (1); | |
564 | } | |
565 | fconfig = fopen(CONFIG, "r"); | |
566 | return (fconfig != NULL); | |
567 | } | |
568 | ||
569 | endconfig() | |
570 | { | |
571 | if (fconfig) { | |
572 | (void) fclose(fconfig); | |
573 | fconfig = NULL; | |
574 | } | |
575 | } | |
576 | ||
577 | struct servtab * | |
578 | getconfigent() | |
579 | { | |
580 | register struct servtab *sep = &serv; | |
581 | int argc; | |
582 | char *cp, *arg, *newstr(); | |
583 | ||
584 | more: | |
585 | while ((cp = nextline(fconfig)) && *cp == '#') | |
586 | ; | |
587 | if (cp == NULL) | |
588 | return ((struct servtab *)0); | |
589 | sep->se_service = newstr(skip(&cp)); | |
590 | arg = skip(&cp); | |
591 | if (strcmp(arg, "stream") == 0) | |
592 | sep->se_socktype = SOCK_STREAM; | |
593 | else if (strcmp(arg, "dgram") == 0) | |
594 | sep->se_socktype = SOCK_DGRAM; | |
595 | else if (strcmp(arg, "rdm") == 0) | |
596 | sep->se_socktype = SOCK_RDM; | |
597 | else if (strcmp(arg, "seqpacket") == 0) | |
598 | sep->se_socktype = SOCK_SEQPACKET; | |
599 | else if (strcmp(arg, "raw") == 0) | |
600 | sep->se_socktype = SOCK_RAW; | |
601 | else | |
602 | sep->se_socktype = -1; | |
603 | sep->se_proto = newstr(skip(&cp)); | |
604 | arg = skip(&cp); | |
605 | sep->se_wait = strcmp(arg, "wait") == 0; | |
606 | sep->se_user = newstr(skip(&cp)); | |
607 | sep->se_server = newstr(skip(&cp)); | |
608 | if (strcmp(sep->se_server, "internal") == 0) { | |
609 | register struct biltin *bi; | |
610 | ||
611 | for (bi = biltins; bi->bi_service; bi++) | |
612 | if (bi->bi_socktype == sep->se_socktype && | |
613 | strcmp(bi->bi_service, sep->se_service) == 0) | |
614 | break; | |
615 | if (bi->bi_service == 0) { | |
616 | syslog(LOG_ERR, "internal service %s unknown\n", | |
617 | sep->se_service); | |
618 | goto more; | |
619 | } | |
620 | sep->se_bi = bi; | |
621 | sep->se_wait = bi->bi_wait; | |
622 | } else | |
623 | sep->se_bi = NULL; | |
624 | argc = 0; | |
625 | for (arg = skip(&cp); cp; arg = skip(&cp)) | |
626 | if (argc < MAXARGV) | |
627 | sep->se_argv[argc++] = newstr(arg); | |
628 | while (argc <= MAXARGV) | |
629 | sep->se_argv[argc++] = NULL; | |
630 | return (sep); | |
631 | } | |
632 | ||
633 | freeconfig(cp) | |
634 | register struct servtab *cp; | |
635 | { | |
636 | int i; | |
637 | ||
638 | if (cp->se_service) | |
639 | free(cp->se_service); | |
640 | if (cp->se_proto) | |
641 | free(cp->se_proto); | |
642 | if (cp->se_user) | |
643 | free(cp->se_user); | |
644 | if (cp->se_server) | |
645 | free(cp->se_server); | |
646 | for (i = 0; i < MAXARGV; i++) | |
647 | if (cp->se_argv[i]) | |
648 | free(cp->se_argv[i]); | |
649 | } | |
650 | ||
651 | char * | |
652 | skip(cpp) | |
653 | char **cpp; | |
654 | { | |
655 | register char *cp = *cpp; | |
656 | char *start; | |
657 | ||
658 | again: | |
659 | while (*cp == ' ' || *cp == '\t') | |
660 | cp++; | |
661 | if (*cp == '\0') { | |
662 | int c; | |
663 | ||
664 | c = getc(fconfig); | |
665 | (void) ungetc(c, fconfig); | |
666 | if (c == ' ' || c == '\t') | |
667 | if (cp = nextline(fconfig)) | |
668 | goto again; | |
669 | *cpp = (char *)0; | |
670 | return ((char *)0); | |
671 | } | |
672 | start = cp; | |
673 | while (*cp && *cp != ' ' && *cp != '\t') | |
674 | cp++; | |
675 | if (*cp != '\0') | |
676 | *cp++ = '\0'; | |
677 | *cpp = cp; | |
678 | return (start); | |
679 | } | |
680 | ||
681 | char * | |
682 | nextline(fd) | |
683 | FILE *fd; | |
684 | { | |
685 | char *cp; | |
686 | ||
687 | if (fgets(line, sizeof (line), fd) == NULL) | |
688 | return ((char *)0); | |
689 | cp = index(line, '\n'); | |
690 | if (cp) | |
691 | *cp = '\0'; | |
692 | return (line); | |
693 | } | |
694 | ||
695 | char * | |
696 | newstr(cp) | |
697 | char *cp; | |
698 | { | |
699 | if (cp = strdup(cp ? cp : "")) | |
700 | return(cp); | |
701 | syslog(LOG_ERR, "strdup: %m"); | |
702 | exit(-1); | |
703 | } | |
704 | ||
705 | setproctitle(a, s) | |
706 | char *a; | |
707 | int s; | |
708 | { | |
709 | int size; | |
710 | register char *cp; | |
711 | struct sockaddr_in sin; | |
712 | char buf[80]; | |
713 | ||
714 | cp = Argv[0]; | |
715 | size = sizeof(sin); | |
716 | if (getpeername(s, (struct sockaddr *)&sin, &size) == 0) | |
717 | (void) sprintf(buf, "-%s [%s]", a, inet_ntoa(sin.sin_addr)); | |
718 | else | |
719 | (void) sprintf(buf, "-%s", a); | |
720 | strncpy(cp, buf, LastArg - cp); | |
721 | cp += strlen(cp); | |
722 | while (cp < LastArg) | |
723 | *cp++ = ' '; | |
724 | } | |
725 | ||
726 | /* | |
727 | * Internet services provided internally by inetd: | |
728 | */ | |
729 | #define BUFSIZE 8192 | |
730 | ||
731 | /* ARGSUSED */ | |
732 | echo_stream(s, sep) /* Echo service -- echo data back */ | |
733 | int s; | |
734 | struct servtab *sep; | |
735 | { | |
736 | char buffer[BUFSIZE]; | |
737 | int i; | |
738 | ||
739 | setproctitle(sep->se_service, s); | |
740 | while ((i = read(s, buffer, sizeof(buffer))) > 0 && | |
741 | write(s, buffer, i) > 0) | |
742 | ; | |
743 | exit(0); | |
744 | } | |
745 | ||
746 | /* ARGSUSED */ | |
747 | echo_dg(s, sep) /* Echo service -- echo data back */ | |
748 | int s; | |
749 | struct servtab *sep; | |
750 | { | |
751 | char buffer[BUFSIZE]; | |
752 | int i, size; | |
753 | struct sockaddr sa; | |
754 | ||
755 | size = sizeof(sa); | |
756 | if ((i = recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size)) < 0) | |
757 | return; | |
758 | (void) sendto(s, buffer, i, 0, &sa, sizeof(sa)); | |
759 | } | |
760 | ||
761 | /* ARGSUSED */ | |
762 | discard_stream(s, sep) /* Discard service -- ignore data */ | |
763 | int s; | |
764 | struct servtab *sep; | |
765 | { | |
766 | int ret; | |
767 | char buffer[BUFSIZE]; | |
768 | ||
769 | setproctitle(sep->se_service, s); | |
770 | while (1) { | |
771 | while ((ret = read(s, buffer, sizeof(buffer))) > 0) | |
772 | ; | |
773 | if (ret == 0 || errno != EINTR) | |
774 | break; | |
775 | } | |
776 | exit(0); | |
777 | } | |
778 | ||
779 | /* ARGSUSED */ | |
780 | discard_dg(s, sep) /* Discard service -- ignore data */ | |
781 | int s; | |
782 | struct servtab *sep; | |
783 | { | |
784 | char buffer[BUFSIZE]; | |
785 | ||
786 | (void) read(s, buffer, sizeof(buffer)); | |
787 | } | |
788 | ||
789 | #include <ctype.h> | |
790 | #define LINESIZ 72 | |
791 | char ring[128]; | |
792 | char *endring; | |
793 | ||
794 | initring() | |
795 | { | |
796 | register int i; | |
797 | ||
798 | endring = ring; | |
799 | ||
800 | for (i = 0; i <= 128; ++i) | |
801 | if (isprint(i)) | |
802 | *endring++ = i; | |
803 | } | |
804 | ||
805 | /* ARGSUSED */ | |
806 | chargen_stream(s, sep) /* Character generator */ | |
807 | int s; | |
808 | struct servtab *sep; | |
809 | { | |
810 | register char *rs; | |
811 | int len; | |
812 | char text[LINESIZ+2]; | |
813 | ||
814 | setproctitle(sep->se_service, s); | |
815 | ||
816 | if (!endring) { | |
817 | initring(); | |
818 | rs = ring; | |
819 | } | |
820 | ||
821 | text[LINESIZ] = '\r'; | |
822 | text[LINESIZ + 1] = '\n'; | |
823 | for (rs = ring;;) { | |
824 | if ((len = endring - rs) >= LINESIZ) | |
825 | bcopy(rs, text, LINESIZ); | |
826 | else { | |
827 | bcopy(rs, text, len); | |
828 | bcopy(ring, text + len, LINESIZ - len); | |
829 | } | |
830 | if (++rs == endring) | |
831 | rs = ring; | |
832 | if (write(s, text, sizeof(text)) != sizeof(text)) | |
833 | break; | |
834 | } | |
835 | exit(0); | |
836 | } | |
837 | ||
838 | /* ARGSUSED */ | |
839 | chargen_dg(s, sep) /* Character generator */ | |
840 | int s; | |
841 | struct servtab *sep; | |
842 | { | |
843 | struct sockaddr sa; | |
844 | static char *rs; | |
845 | int len, size; | |
846 | char text[LINESIZ+2]; | |
847 | ||
848 | if (endring == 0) { | |
849 | initring(); | |
850 | rs = ring; | |
851 | } | |
852 | ||
853 | size = sizeof(sa); | |
854 | if (recvfrom(s, text, sizeof(text), 0, &sa, &size) < 0) | |
855 | return; | |
856 | ||
857 | if ((len = endring - rs) >= LINESIZ) | |
858 | bcopy(rs, text, LINESIZ); | |
859 | else { | |
860 | bcopy(rs, text, len); | |
861 | bcopy(ring, text + len, LINESIZ - len); | |
862 | } | |
863 | if (++rs == endring) | |
864 | rs = ring; | |
865 | text[LINESIZ] = '\r'; | |
866 | text[LINESIZ + 1] = '\n'; | |
867 | (void) sendto(s, text, sizeof(text), 0, &sa, sizeof(sa)); | |
868 | } | |
869 | ||
870 | /* | |
871 | * Return a machine readable date and time, in the form of the | |
872 | * number of seconds since midnight, Jan 1, 1900. Since gettimeofday | |
873 | * returns the number of seconds since midnight, Jan 1, 1970, | |
874 | * we must add 2208988800 seconds to this figure to make up for | |
875 | * some seventy years Bell Labs was asleep. | |
876 | */ | |
877 | ||
878 | long | |
879 | machtime() | |
880 | { | |
881 | struct timeval tv; | |
882 | ||
883 | if (gettimeofday(&tv, (struct timezone *)0) < 0) { | |
884 | fprintf(stderr, "Unable to get time of day\n"); | |
885 | return (0L); | |
886 | } | |
887 | return (htonl((long)tv.tv_sec + 2208988800)); | |
888 | } | |
889 | ||
890 | /* ARGSUSED */ | |
891 | machtime_stream(s, sep) | |
892 | int s; | |
893 | struct servtab *sep; | |
894 | { | |
895 | long result; | |
896 | ||
897 | result = machtime(); | |
898 | (void) write(s, (char *) &result, sizeof(result)); | |
899 | } | |
900 | ||
901 | /* ARGSUSED */ | |
902 | machtime_dg(s, sep) | |
903 | int s; | |
904 | struct servtab *sep; | |
905 | { | |
906 | long result; | |
907 | struct sockaddr sa; | |
908 | int size; | |
909 | ||
910 | size = sizeof(sa); | |
911 | if (recvfrom(s, (char *)&result, sizeof(result), 0, &sa, &size) < 0) | |
912 | return; | |
913 | result = machtime(); | |
914 | (void) sendto(s, (char *) &result, sizeof(result), 0, &sa, sizeof(sa)); | |
915 | } | |
916 | ||
917 | /* ARGSUSED */ | |
918 | daytime_stream(s, sep) /* Return human-readable time of day */ | |
919 | int s; | |
920 | struct servtab *sep; | |
921 | { | |
922 | char buffer[256]; | |
923 | time_t time(), clock; | |
924 | char *ctime(); | |
925 | ||
926 | clock = time((time_t *) 0); | |
927 | ||
928 | (void) sprintf(buffer, "%.24s\r\n", ctime(&clock)); | |
929 | (void) write(s, buffer, strlen(buffer)); | |
930 | } | |
931 | ||
932 | /* ARGSUSED */ | |
933 | daytime_dg(s, sep) /* Return human-readable time of day */ | |
934 | int s; | |
935 | struct servtab *sep; | |
936 | { | |
937 | char buffer[256]; | |
938 | time_t time(), clock; | |
939 | struct sockaddr sa; | |
940 | int size; | |
941 | char *ctime(); | |
942 | ||
943 | clock = time((time_t *) 0); | |
944 | ||
945 | size = sizeof(sa); | |
946 | if (recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size) < 0) | |
947 | return; | |
948 | (void) sprintf(buffer, "%.24s\r\n", ctime(&clock)); | |
949 | (void) sendto(s, buffer, strlen(buffer), 0, &sa, sizeof(sa)); | |
950 | } | |
951 | ||
952 | /* | |
953 | * print_service: | |
954 | * Dump relevant information to stderr | |
955 | */ | |
956 | print_service(action, sep) | |
957 | char *action; | |
958 | struct servtab *sep; | |
959 | { | |
960 | fprintf(stderr, | |
961 | "%s: %s proto=%s, wait=%d, user=%s builtin=%x server=%s\n", | |
962 | action, sep->se_service, sep->se_proto, | |
963 | sep->se_wait, sep->se_user, (int)sep->se_bi, sep->se_server); | |
964 | } |