| 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 | } |