Commit | Line | Data |
---|---|---|
528b0614 DF |
1 | /* |
2 | * Copyright (c) 1983 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 |
995785db | 15 | static char sccsid[] = "@(#)inetd.c 5.25 (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) | |
227 | if (FD_ISSET(sep->se_fd, &readable)) { | |
228 | n--; | |
21ed1185 MK |
229 | if (debug) |
230 | fprintf(stderr, "someone wants %s\n", sep->se_service); | |
83df167a | 231 | if (sep->se_socktype == SOCK_STREAM) { |
fc99bd8d MK |
232 | ctrl = accept(sep->se_fd, (struct sockaddr *)0, |
233 | (int *)0); | |
6a3125d9 RC |
234 | if (debug) |
235 | fprintf(stderr, "accept, ctrl %d\n", ctrl); | |
21ed1185 MK |
236 | if (ctrl < 0) { |
237 | if (errno == EINTR) | |
238 | continue; | |
83df167a KB |
239 | syslog(LOG_WARNING, "accept (for %s): %m", |
240 | sep->se_service); | |
21ed1185 MK |
241 | continue; |
242 | } | |
243 | } else | |
244 | ctrl = sep->se_fd; | |
fc99bd8d | 245 | (void) sigblock(SIGBLOCK); |
b1b30605 | 246 | pid = 0; |
fc99bd8d MK |
247 | dofork = (sep->se_bi == 0 || sep->se_bi->bi_fork); |
248 | if (dofork) { | |
249 | if (sep->se_count++ == 0) | |
250 | (void)gettimeofday(&sep->se_time, | |
251 | (struct timezone *)0); | |
252 | else if (sep->se_count >= TOOMANY) { | |
253 | struct timeval now; | |
254 | ||
255 | (void)gettimeofday(&now, (struct timezone *)0); | |
256 | if (now.tv_sec - sep->se_time.tv_sec > | |
257 | CNT_INTVL) { | |
258 | sep->se_time = now; | |
259 | sep->se_count = 1; | |
260 | } else { | |
261 | syslog(LOG_ERR, | |
262 | "%s/%s server failing (looping), service terminated\n", | |
263 | sep->se_service, sep->se_proto); | |
264 | FD_CLR(sep->se_fd, &allsock); | |
265 | (void) close(sep->se_fd); | |
266 | sep->se_fd = -1; | |
267 | sep->se_count = 0; | |
268 | nsock--; | |
92732149 | 269 | sigsetmask(0L); |
fc99bd8d MK |
270 | if (!timingout) { |
271 | timingout = 1; | |
272 | alarm(RETRYTIME); | |
273 | } | |
274 | continue; | |
275 | } | |
276 | } | |
b1b30605 | 277 | pid = fork(); |
fc99bd8d | 278 | } |
21ed1185 | 279 | if (pid < 0) { |
83df167a | 280 | if (sep->se_socktype == SOCK_STREAM) |
21ed1185 | 281 | close(ctrl); |
92732149 | 282 | sigsetmask(0L); |
21ed1185 MK |
283 | sleep(1); |
284 | continue; | |
285 | } | |
fc99bd8d | 286 | if (pid && sep->se_wait) { |
21ed1185 | 287 | sep->se_wait = pid; |
fc99bd8d | 288 | FD_CLR(sep->se_fd, &allsock); |
5859fc43 | 289 | nsock--; |
21ed1185 | 290 | } |
92732149 | 291 | sigsetmask(0L); |
21ed1185 | 292 | if (pid == 0) { |
995785db MK |
293 | if (debug && dofork) |
294 | setsid(); | |
fc99bd8d | 295 | if (dofork) |
567752b5 KB |
296 | for (tmpint = getdtablesize(); --tmpint > 2; ) |
297 | if (tmpint != ctrl) | |
298 | close(tmpint); | |
b1b30605 MK |
299 | if (sep->se_bi) |
300 | (*sep->se_bi->bi_fn)(ctrl, sep); | |
301 | else { | |
302 | dup2(ctrl, 0); | |
303 | close(ctrl); | |
304 | dup2(0, 1); | |
305 | dup2(0, 2); | |
306 | if ((pwd = getpwnam(sep->se_user)) == NULL) { | |
307 | syslog(LOG_ERR, | |
308 | "getpwnam: %s: No such user", | |
309 | sep->se_user); | |
fc99bd8d MK |
310 | if (sep->se_socktype != SOCK_STREAM) |
311 | recv(0, buf, sizeof (buf), 0); | |
b1b30605 MK |
312 | _exit(1); |
313 | } | |
314 | if (pwd->pw_uid) { | |
2a6b82aa | 315 | (void) setgid((gid_t)pwd->pw_gid); |
b1b30605 | 316 | initgroups(pwd->pw_name, pwd->pw_gid); |
2a6b82aa | 317 | (void) setuid((uid_t)pwd->pw_uid); |
b1b30605 MK |
318 | } |
319 | if (debug) | |
320 | fprintf(stderr, "%d execl %s\n", | |
321 | getpid(), sep->se_server); | |
322 | execv(sep->se_server, sep->se_argv); | |
323 | if (sep->se_socktype != SOCK_STREAM) | |
324 | recv(0, buf, sizeof (buf), 0); | |
325 | syslog(LOG_ERR, "execv %s: %m", sep->se_server); | |
326 | _exit(1); | |
7d5eb6c4 | 327 | } |
21ed1185 | 328 | } |
83df167a | 329 | if (sep->se_socktype == SOCK_STREAM) |
21ed1185 | 330 | close(ctrl); |
fc99bd8d | 331 | } |
21ed1185 MK |
332 | } |
333 | } | |
334 | ||
664e9651 | 335 | void |
21ed1185 MK |
336 | reapchild() |
337 | { | |
338 | union wait status; | |
339 | int pid; | |
340 | register struct servtab *sep; | |
341 | ||
342 | for (;;) { | |
2a6b82aa | 343 | pid = wait3(&status, WNOHANG, (struct rusage *)0); |
21ed1185 MK |
344 | if (pid <= 0) |
345 | break; | |
346 | if (debug) | |
347 | fprintf(stderr, "%d reaped\n", pid); | |
348 | for (sep = servtab; sep; sep = sep->se_next) | |
349 | if (sep->se_wait == pid) { | |
350 | if (status.w_status) | |
6a3125d9 RC |
351 | syslog(LOG_WARNING, |
352 | "%s: exit status 0x%x", | |
21ed1185 MK |
353 | sep->se_server, status); |
354 | if (debug) | |
355 | fprintf(stderr, "restored %s, fd %d\n", | |
356 | sep->se_service, sep->se_fd); | |
5859fc43 MK |
357 | FD_SET(sep->se_fd, &allsock); |
358 | nsock++; | |
21ed1185 MK |
359 | sep->se_wait = 1; |
360 | } | |
361 | } | |
362 | } | |
363 | ||
664e9651 | 364 | void |
21ed1185 MK |
365 | config() |
366 | { | |
367 | register struct servtab *sep, *cp, **sepp; | |
368 | struct servtab *getconfigent(), *enter(); | |
92732149 | 369 | long omask; |
21ed1185 MK |
370 | |
371 | if (!setconfig()) { | |
6a3125d9 | 372 | syslog(LOG_ERR, "%s: %m", CONFIG); |
21ed1185 MK |
373 | return; |
374 | } | |
375 | for (sep = servtab; sep; sep = sep->se_next) | |
376 | sep->se_checked = 0; | |
377 | while (cp = getconfigent()) { | |
378 | for (sep = servtab; sep; sep = sep->se_next) | |
379 | if (strcmp(sep->se_service, cp->se_service) == 0 && | |
380 | strcmp(sep->se_proto, cp->se_proto) == 0) | |
381 | break; | |
382 | if (sep != 0) { | |
383 | int i; | |
384 | ||
fc99bd8d | 385 | omask = sigblock(SIGBLOCK); |
90aae428 KB |
386 | /* |
387 | * sep->se_wait may be holding the pid of a daemon | |
388 | * that we're waiting for. If so, don't overwrite | |
389 | * it unless the config file explicitly says don't | |
390 | * wait. | |
391 | */ | |
392 | if (cp->se_bi == 0 && | |
393 | (sep->se_wait == 1 || cp->se_wait == 0)) | |
fc99bd8d | 394 | sep->se_wait = cp->se_wait; |
21ed1185 | 395 | #define SWAP(a, b) { char *c = a; a = b; b = c; } |
2a6b82aa JL |
396 | if (cp->se_user) |
397 | SWAP(sep->se_user, cp->se_user); | |
21ed1185 MK |
398 | if (cp->se_server) |
399 | SWAP(sep->se_server, cp->se_server); | |
400 | for (i = 0; i < MAXARGV; i++) | |
401 | SWAP(sep->se_argv[i], cp->se_argv[i]); | |
402 | sigsetmask(omask); | |
403 | freeconfig(cp); | |
9a0fbd5b MK |
404 | if (debug) |
405 | print_service("REDO", sep); | |
406 | } else { | |
21ed1185 | 407 | sep = enter(cp); |
9a0fbd5b MK |
408 | if (debug) |
409 | print_service("ADD ", sep); | |
410 | } | |
21ed1185 | 411 | sep->se_checked = 1; |
21ed1185 MK |
412 | sp = getservbyname(sep->se_service, sep->se_proto); |
413 | if (sp == 0) { | |
6a3125d9 | 414 | syslog(LOG_ERR, "%s/%s: unknown service", |
21ed1185 MK |
415 | sep->se_service, sep->se_proto); |
416 | continue; | |
417 | } | |
fc99bd8d MK |
418 | if (sp->s_port != sep->se_ctrladdr.sin_port) { |
419 | sep->se_ctrladdr.sin_port = sp->s_port; | |
420 | if (sep->se_fd != -1) | |
421 | (void) close(sep->se_fd); | |
422 | sep->se_fd = -1; | |
21ed1185 | 423 | } |
fc99bd8d MK |
424 | if (sep->se_fd == -1) |
425 | setup(sep); | |
21ed1185 MK |
426 | } |
427 | endconfig(); | |
428 | /* | |
429 | * Purge anything not looked at above. | |
430 | */ | |
fc99bd8d | 431 | omask = sigblock(SIGBLOCK); |
21ed1185 MK |
432 | sepp = &servtab; |
433 | while (sep = *sepp) { | |
434 | if (sep->se_checked) { | |
435 | sepp = &sep->se_next; | |
436 | continue; | |
437 | } | |
438 | *sepp = sep->se_next; | |
439 | if (sep->se_fd != -1) { | |
5859fc43 MK |
440 | FD_CLR(sep->se_fd, &allsock); |
441 | nsock--; | |
21ed1185 MK |
442 | (void) close(sep->se_fd); |
443 | } | |
9a0fbd5b MK |
444 | if (debug) |
445 | print_service("FREE", sep); | |
21ed1185 MK |
446 | freeconfig(sep); |
447 | free((char *)sep); | |
448 | } | |
449 | (void) sigsetmask(omask); | |
450 | } | |
451 | ||
664e9651 | 452 | void |
fc99bd8d MK |
453 | retry() |
454 | { | |
455 | register struct servtab *sep; | |
456 | ||
457 | timingout = 0; | |
458 | for (sep = servtab; sep; sep = sep->se_next) | |
459 | if (sep->se_fd == -1) | |
460 | setup(sep); | |
461 | } | |
462 | ||
463 | setup(sep) | |
464 | register struct servtab *sep; | |
465 | { | |
466 | int on = 1; | |
467 | ||
468 | if ((sep->se_fd = socket(AF_INET, sep->se_socktype, 0)) < 0) { | |
469 | syslog(LOG_ERR, "%s/%s: socket: %m", | |
470 | sep->se_service, sep->se_proto); | |
471 | return; | |
472 | } | |
473 | #define turnon(fd, opt) \ | |
474 | setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) | |
475 | if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && | |
476 | turnon(sep->se_fd, SO_DEBUG) < 0) | |
477 | syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); | |
478 | if (turnon(sep->se_fd, SO_REUSEADDR) < 0) | |
479 | syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); | |
480 | #undef turnon | |
481 | if (bind(sep->se_fd, &sep->se_ctrladdr, | |
482 | sizeof (sep->se_ctrladdr)) < 0) { | |
483 | syslog(LOG_ERR, "%s/%s: bind: %m", | |
484 | sep->se_service, sep->se_proto); | |
485 | (void) close(sep->se_fd); | |
486 | sep->se_fd = -1; | |
487 | if (!timingout) { | |
488 | timingout = 1; | |
489 | alarm(RETRYTIME); | |
490 | } | |
491 | return; | |
492 | } | |
493 | if (sep->se_socktype == SOCK_STREAM) | |
494 | listen(sep->se_fd, 10); | |
495 | FD_SET(sep->se_fd, &allsock); | |
496 | nsock++; | |
497 | if (sep->se_fd > maxsock) | |
498 | maxsock = sep->se_fd; | |
499 | } | |
500 | ||
21ed1185 MK |
501 | struct servtab * |
502 | enter(cp) | |
503 | struct servtab *cp; | |
504 | { | |
505 | register struct servtab *sep; | |
92732149 | 506 | long omask; |
21ed1185 MK |
507 | |
508 | sep = (struct servtab *)malloc(sizeof (*sep)); | |
509 | if (sep == (struct servtab *)0) { | |
6a3125d9 | 510 | syslog(LOG_ERR, "Out of memory."); |
21ed1185 MK |
511 | exit(-1); |
512 | } | |
513 | *sep = *cp; | |
514 | sep->se_fd = -1; | |
fc99bd8d | 515 | omask = sigblock(SIGBLOCK); |
21ed1185 MK |
516 | sep->se_next = servtab; |
517 | servtab = sep; | |
518 | sigsetmask(omask); | |
519 | return (sep); | |
520 | } | |
521 | ||
522 | FILE *fconfig = NULL; | |
523 | struct servtab serv; | |
524 | char line[256]; | |
525 | char *skip(), *nextline(); | |
526 | ||
527 | setconfig() | |
528 | { | |
529 | ||
530 | if (fconfig != NULL) { | |
2a6b82aa | 531 | fseek(fconfig, 0L, L_SET); |
21ed1185 MK |
532 | return (1); |
533 | } | |
534 | fconfig = fopen(CONFIG, "r"); | |
535 | return (fconfig != NULL); | |
536 | } | |
537 | ||
538 | endconfig() | |
539 | { | |
567752b5 KB |
540 | if (fconfig) { |
541 | (void) fclose(fconfig); | |
542 | fconfig = NULL; | |
543 | } | |
21ed1185 MK |
544 | } |
545 | ||
546 | struct servtab * | |
547 | getconfigent() | |
548 | { | |
549 | register struct servtab *sep = &serv; | |
21ed1185 | 550 | int argc; |
9166e6a5 | 551 | char *cp, *arg, *strdup(); |
21ed1185 | 552 | |
b1b30605 | 553 | more: |
21ed1185 MK |
554 | while ((cp = nextline(fconfig)) && *cp == '#') |
555 | ; | |
556 | if (cp == NULL) | |
557 | return ((struct servtab *)0); | |
558 | sep->se_service = strdup(skip(&cp)); | |
559 | arg = skip(&cp); | |
560 | if (strcmp(arg, "stream") == 0) | |
561 | sep->se_socktype = SOCK_STREAM; | |
562 | else if (strcmp(arg, "dgram") == 0) | |
563 | sep->se_socktype = SOCK_DGRAM; | |
564 | else if (strcmp(arg, "rdm") == 0) | |
565 | sep->se_socktype = SOCK_RDM; | |
566 | else if (strcmp(arg, "seqpacket") == 0) | |
567 | sep->se_socktype = SOCK_SEQPACKET; | |
568 | else if (strcmp(arg, "raw") == 0) | |
569 | sep->se_socktype = SOCK_RAW; | |
570 | else | |
571 | sep->se_socktype = -1; | |
572 | sep->se_proto = strdup(skip(&cp)); | |
573 | arg = skip(&cp); | |
574 | sep->se_wait = strcmp(arg, "wait") == 0; | |
7d5eb6c4 | 575 | sep->se_user = strdup(skip(&cp)); |
21ed1185 | 576 | sep->se_server = strdup(skip(&cp)); |
b1b30605 MK |
577 | if (strcmp(sep->se_server, "internal") == 0) { |
578 | register struct biltin *bi; | |
579 | ||
580 | for (bi = biltins; bi->bi_service; bi++) | |
581 | if (bi->bi_socktype == sep->se_socktype && | |
582 | strcmp(bi->bi_service, sep->se_service) == 0) | |
583 | break; | |
584 | if (bi->bi_service == 0) { | |
585 | syslog(LOG_ERR, "internal service %s unknown\n", | |
586 | sep->se_service); | |
587 | goto more; | |
588 | } | |
589 | sep->se_bi = bi; | |
590 | sep->se_wait = bi->bi_wait; | |
9a0fbd5b MK |
591 | } else |
592 | sep->se_bi = NULL; | |
21ed1185 MK |
593 | argc = 0; |
594 | for (arg = skip(&cp); cp; arg = skip(&cp)) | |
595 | if (argc < MAXARGV) | |
596 | sep->se_argv[argc++] = strdup(arg); | |
597 | while (argc <= MAXARGV) | |
598 | sep->se_argv[argc++] = NULL; | |
599 | return (sep); | |
600 | } | |
601 | ||
602 | freeconfig(cp) | |
603 | register struct servtab *cp; | |
604 | { | |
605 | int i; | |
606 | ||
607 | if (cp->se_service) | |
608 | free(cp->se_service); | |
609 | if (cp->se_proto) | |
610 | free(cp->se_proto); | |
2a6b82aa JL |
611 | if (cp->se_user) |
612 | free(cp->se_user); | |
21ed1185 MK |
613 | if (cp->se_server) |
614 | free(cp->se_server); | |
615 | for (i = 0; i < MAXARGV; i++) | |
616 | if (cp->se_argv[i]) | |
617 | free(cp->se_argv[i]); | |
618 | } | |
619 | ||
620 | char * | |
621 | skip(cpp) | |
622 | char **cpp; | |
623 | { | |
624 | register char *cp = *cpp; | |
625 | char *start; | |
626 | ||
627 | again: | |
628 | while (*cp == ' ' || *cp == '\t') | |
629 | cp++; | |
630 | if (*cp == '\0') { | |
4650c563 | 631 | int c; |
21ed1185 MK |
632 | |
633 | c = getc(fconfig); | |
567752b5 | 634 | (void) ungetc(c, fconfig); |
21ed1185 MK |
635 | if (c == ' ' || c == '\t') |
636 | if (cp = nextline(fconfig)) | |
637 | goto again; | |
638 | *cpp = (char *)0; | |
639 | return ((char *)0); | |
640 | } | |
641 | start = cp; | |
642 | while (*cp && *cp != ' ' && *cp != '\t') | |
643 | cp++; | |
644 | if (*cp != '\0') | |
645 | *cp++ = '\0'; | |
646 | *cpp = cp; | |
647 | return (start); | |
648 | } | |
649 | ||
650 | char * | |
651 | nextline(fd) | |
652 | FILE *fd; | |
653 | { | |
654 | char *cp; | |
655 | ||
2a6b82aa | 656 | if (fgets(line, sizeof (line), fd) == NULL) |
21ed1185 MK |
657 | return ((char *)0); |
658 | cp = index(line, '\n'); | |
659 | if (cp) | |
660 | *cp = '\0'; | |
661 | return (line); | |
662 | } | |
663 | ||
664 | char * | |
665 | strdup(cp) | |
666 | char *cp; | |
667 | { | |
668 | char *new; | |
669 | ||
670 | if (cp == NULL) | |
671 | cp = ""; | |
2a6b82aa | 672 | new = malloc((unsigned)(strlen(cp) + 1)); |
21ed1185 | 673 | if (new == (char *)0) { |
6a3125d9 | 674 | syslog(LOG_ERR, "Out of memory."); |
21ed1185 MK |
675 | exit(-1); |
676 | } | |
567752b5 | 677 | (void)strcpy(new, cp); |
21ed1185 MK |
678 | return (new); |
679 | } | |
b1b30605 MK |
680 | |
681 | setproctitle(a, s) | |
682 | char *a; | |
683 | int s; | |
684 | { | |
685 | int size; | |
686 | register char *cp; | |
687 | struct sockaddr_in sin; | |
688 | char buf[80]; | |
689 | ||
690 | cp = Argv[0]; | |
691 | size = sizeof(sin); | |
692 | if (getpeername(s, &sin, &size) == 0) | |
9bd38ba8 | 693 | (void) sprintf(buf, "-%s [%s]", a, inet_ntoa(sin.sin_addr)); |
b1b30605 | 694 | else |
9bd38ba8 | 695 | (void) sprintf(buf, "-%s", a); |
b1b30605 MK |
696 | strncpy(cp, buf, LastArg - cp); |
697 | cp += strlen(cp); | |
698 | while (cp < LastArg) | |
699 | *cp++ = ' '; | |
700 | } | |
701 | ||
702 | /* | |
703 | * Internet services provided internally by inetd: | |
704 | */ | |
b9c70736 | 705 | #define BUFSIZE 4096 |
b1b30605 MK |
706 | |
707 | /* ARGSUSED */ | |
708 | echo_stream(s, sep) /* Echo service -- echo data back */ | |
709 | int s; | |
710 | struct servtab *sep; | |
711 | { | |
b9c70736 | 712 | char buffer[BUFSIZE]; |
b1b30605 MK |
713 | int i; |
714 | ||
0ee95e67 | 715 | setproctitle(sep->se_service, s); |
b1b30605 MK |
716 | while ((i = read(s, buffer, sizeof(buffer))) > 0 && |
717 | write(s, buffer, i) > 0) | |
718 | ; | |
719 | exit(0); | |
720 | } | |
721 | ||
722 | /* ARGSUSED */ | |
723 | echo_dg(s, sep) /* Echo service -- echo data back */ | |
724 | int s; | |
725 | struct servtab *sep; | |
726 | { | |
b9c70736 | 727 | char buffer[BUFSIZE]; |
b1b30605 MK |
728 | int i, size; |
729 | struct sockaddr sa; | |
730 | ||
731 | size = sizeof(sa); | |
732 | if ((i = recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size)) < 0) | |
733 | return; | |
734 | (void) sendto(s, buffer, i, 0, &sa, sizeof(sa)); | |
735 | } | |
736 | ||
737 | /* ARGSUSED */ | |
738 | discard_stream(s, sep) /* Discard service -- ignore data */ | |
739 | int s; | |
740 | struct servtab *sep; | |
741 | { | |
b9c70736 | 742 | char buffer[BUFSIZE]; |
b1b30605 | 743 | |
0ee95e67 | 744 | setproctitle(sep->se_service, s); |
b1b30605 MK |
745 | while (1) { |
746 | while (read(s, buffer, sizeof(buffer)) > 0) | |
747 | ; | |
748 | if (errno != EINTR) | |
749 | break; | |
750 | } | |
751 | exit(0); | |
752 | } | |
753 | ||
754 | /* ARGSUSED */ | |
755 | discard_dg(s, sep) /* Discard service -- ignore data */ | |
756 | int s; | |
757 | struct servtab *sep; | |
758 | { | |
b9c70736 | 759 | char buffer[BUFSIZE]; |
b1b30605 MK |
760 | |
761 | (void) read(s, buffer, sizeof(buffer)); | |
762 | } | |
763 | ||
764 | #include <ctype.h> | |
765 | #define LINESIZ 72 | |
766 | char ring[128]; | |
767 | char *endring; | |
768 | ||
769 | initring() | |
770 | { | |
771 | register int i; | |
772 | ||
773 | endring = ring; | |
774 | ||
775 | for (i = 0; i <= 128; ++i) | |
776 | if (isprint(i)) | |
777 | *endring++ = i; | |
778 | } | |
779 | ||
780 | /* ARGSUSED */ | |
781 | chargen_stream(s, sep) /* Character generator */ | |
782 | int s; | |
783 | struct servtab *sep; | |
784 | { | |
92732149 KB |
785 | register char *rs; |
786 | int len; | |
b1b30605 | 787 | char text[LINESIZ+2]; |
b1b30605 | 788 | |
0ee95e67 | 789 | setproctitle(sep->se_service, s); |
92732149 KB |
790 | |
791 | if (!endring) { | |
b1b30605 | 792 | initring(); |
92732149 KB |
793 | rs = ring; |
794 | } | |
b1b30605 | 795 | |
92732149 KB |
796 | text[LINESIZ] = '\r'; |
797 | text[LINESIZ + 1] = '\n'; | |
798 | for (rs = ring;;) { | |
799 | if ((len = endring - rs) >= LINESIZ) | |
800 | bcopy(rs, text, LINESIZ); | |
801 | else { | |
802 | bcopy(rs, text, len); | |
803 | bcopy(ring, text + len, LINESIZ - len); | |
b1b30605 | 804 | } |
92732149 KB |
805 | if (++rs == endring) |
806 | rs = ring; | |
807 | if (write(s, text, sizeof(text)) != sizeof(text)) | |
b1b30605 MK |
808 | break; |
809 | } | |
810 | exit(0); | |
811 | } | |
812 | ||
813 | /* ARGSUSED */ | |
814 | chargen_dg(s, sep) /* Character generator */ | |
815 | int s; | |
816 | struct servtab *sep; | |
817 | { | |
b1b30605 | 818 | struct sockaddr sa; |
92732149 KB |
819 | static char *rs; |
820 | int len, size; | |
821 | char text[LINESIZ+2]; | |
b1b30605 | 822 | |
92732149 | 823 | if (endring == 0) { |
b1b30605 | 824 | initring(); |
92732149 KB |
825 | rs = ring; |
826 | } | |
b1b30605 MK |
827 | |
828 | size = sizeof(sa); | |
829 | if (recvfrom(s, text, sizeof(text), 0, &sa, &size) < 0) | |
830 | return; | |
b1b30605 | 831 | |
92732149 KB |
832 | if ((len = endring - rs) >= LINESIZ) |
833 | bcopy(rs, text, LINESIZ); | |
834 | else { | |
835 | bcopy(rs, text, len); | |
836 | bcopy(ring, text + len, LINESIZ - len); | |
837 | } | |
838 | if (++rs == endring) | |
839 | rs = ring; | |
840 | text[LINESIZ] = '\r'; | |
841 | text[LINESIZ + 1] = '\n'; | |
b1b30605 MK |
842 | (void) sendto(s, text, sizeof(text), 0, &sa, sizeof(sa)); |
843 | } | |
844 | ||
845 | /* | |
846 | * Return a machine readable date and time, in the form of the | |
847 | * number of seconds since midnight, Jan 1, 1900. Since gettimeofday | |
848 | * returns the number of seconds since midnight, Jan 1, 1970, | |
849 | * we must add 2208988800 seconds to this figure to make up for | |
850 | * some seventy years Bell Labs was asleep. | |
851 | */ | |
b1b30605 MK |
852 | |
853 | long | |
854 | machtime() | |
855 | { | |
856 | struct timeval tv; | |
857 | ||
2a6b82aa | 858 | if (gettimeofday(&tv, (struct timezone *)0) < 0) { |
b1b30605 | 859 | fprintf(stderr, "Unable to get time of day\n"); |
2a6b82aa | 860 | return (0L); |
b1b30605 MK |
861 | } |
862 | return (htonl((long)tv.tv_sec + 2208988800)); | |
863 | } | |
864 | ||
865 | /* ARGSUSED */ | |
866 | machtime_stream(s, sep) | |
867 | int s; | |
868 | struct servtab *sep; | |
869 | { | |
870 | long result; | |
871 | ||
872 | result = machtime(); | |
873 | (void) write(s, (char *) &result, sizeof(result)); | |
874 | } | |
875 | ||
876 | /* ARGSUSED */ | |
877 | machtime_dg(s, sep) | |
878 | int s; | |
879 | struct servtab *sep; | |
880 | { | |
881 | long result; | |
882 | struct sockaddr sa; | |
883 | int size; | |
884 | ||
885 | size = sizeof(sa); | |
2a6b82aa | 886 | if (recvfrom(s, (char *)&result, sizeof(result), 0, &sa, &size) < 0) |
b1b30605 MK |
887 | return; |
888 | result = machtime(); | |
889 | (void) sendto(s, (char *) &result, sizeof(result), 0, &sa, sizeof(sa)); | |
890 | } | |
891 | ||
892 | /* ARGSUSED */ | |
893 | daytime_stream(s, sep) /* Return human-readable time of day */ | |
894 | int s; | |
895 | struct servtab *sep; | |
896 | { | |
897 | char buffer[256]; | |
898 | time_t time(), clock; | |
899 | char *ctime(); | |
900 | ||
901 | clock = time((time_t *) 0); | |
902 | ||
9bd38ba8 | 903 | (void) sprintf(buffer, "%.24s\r\n", ctime(&clock)); |
2a6b82aa | 904 | (void) write(s, buffer, strlen(buffer)); |
b1b30605 MK |
905 | } |
906 | ||
907 | /* ARGSUSED */ | |
908 | daytime_dg(s, sep) /* Return human-readable time of day */ | |
909 | int s; | |
910 | struct servtab *sep; | |
911 | { | |
912 | char buffer[256]; | |
913 | time_t time(), clock; | |
914 | struct sockaddr sa; | |
915 | int size; | |
916 | char *ctime(); | |
917 | ||
918 | clock = time((time_t *) 0); | |
919 | ||
920 | size = sizeof(sa); | |
921 | if (recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size) < 0) | |
922 | return; | |
9bd38ba8 | 923 | (void) sprintf(buffer, "%.24s\r\n", ctime(&clock)); |
b1b30605 MK |
924 | (void) sendto(s, buffer, strlen(buffer), 0, &sa, sizeof(sa)); |
925 | } | |
9a0fbd5b MK |
926 | |
927 | /* | |
928 | * print_service: | |
929 | * Dump relevant information to stderr | |
930 | */ | |
931 | print_service(action, sep) | |
932 | char *action; | |
933 | struct servtab *sep; | |
934 | { | |
935 | fprintf(stderr, | |
936 | "%s: %s proto=%s, wait=%d, user=%s builtin=%x server=%s\n", | |
937 | action, sep->se_service, sep->se_proto, | |
567752b5 | 938 | sep->se_wait, sep->se_user, (int)sep->se_bi, sep->se_server); |
9a0fbd5b | 939 | } |