1 /* $NetBSD: inetd.c,v 1.11 1996/02/22 11:14:41 mycroft Exp $ */ 2 /* 3 * Copyright (c) 1983,1991 The Regents of the University of California. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by the University of 17 * California, Berkeley and its contributors. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #ifndef lint 36 char copyright[] = 37 "@(#) Copyright (c) 1983 Regents of the University of California.\n\ 38 All rights reserved.\n"; 39 #endif /* not lint */ 40 41 #ifndef lint 42 /*static char sccsid[] = "from: @(#)inetd.c 5.30 (Berkeley) 6/3/91";*/ 43 static char rcsid[] = "$Id: inetd.c,v 1.11 1996/02/22 11:14:41 mycroft Exp $"; 44 #endif /* not lint */ 45 46 /* 47 * Inetd - Internet super-server 48 * 49 * This program invokes all internet services as needed. 50 * connection-oriented services are invoked each time a 51 * connection is made, by creating a process. This process 52 * is passed the connection as file descriptor 0 and is 53 * expected to do a getpeername to find out the source host 54 * and port. 55 * 56 * Datagram oriented services are invoked when a datagram 57 * arrives; a process is created and passed a pending message 58 * on file descriptor 0. Datagram servers may either connect 59 * to their peer, freeing up the original socket for inetd 60 * to receive further messages on, or ``take over the socket'', 61 * processing all arriving datagrams and, eventually, timing 62 * out. The first type of server is said to be ``multi-threaded''; 63 * the second type of server ``single-threaded''. 64 * 65 * Inetd uses a configuration file which is read at startup 66 * and, possibly, at some later time in response to a hangup signal. 67 * The configuration file is ``free format'' with fields given in the 68 * order shown below. Continuation lines for an entry must being with 69 * a space or tab. All fields must be present in each entry. 70 * 71 * service name must be in /etc/services 72 * socket type stream/dgram/raw/rdm/seqpacket 73 * protocol must be in /etc/protocols 74 * wait/nowait[.max] single-threaded/multi-threaded, max # 75 * user[.group] user/group to run daemon as 76 * server program full path name 77 * server program arguments maximum of MAXARGS (20) 78 * 79 * For RPC services 80 * service name/version must be in /etc/rpc 81 * socket type stream/dgram/raw/rdm/seqpacket 82 * protocol must be in /etc/protocols 83 * wait/nowait[.max] single-threaded/multi-threaded 84 * user[.group] user to run daemon as 85 * server program full path name 86 * server program arguments maximum of MAXARGS (20) 87 * 88 * Comment lines are indicated by a `#' in column 1. 89 */ 90 91 /* 92 * Here's the scoop concerning the user.group feature: 93 * 94 * 1) set-group-option off. 95 * 96 * a) user = root: NO setuid() or setgid() is done 97 * 98 * b) other: setuid() 99 * setgid(primary group as found in passwd) 100 * initgroups(name, primary group) 101 * 102 * 2) set-group-option on. 103 * 104 * a) user = root: NO setuid() 105 * setgid(specified group) 106 * NO initgroups() 107 * 108 * b) other: setuid() 109 * setgid(specified group) 110 * initgroups(name, specified group) 111 * 112 */ 113 114 #include <sys/param.h> 115 #include <sys/stat.h> 116 #include <sys/ioctl.h> 117 #include <sys/socket.h> 118 #include <sys/un.h> 119 #include <sys/file.h> 120 #include <sys/wait.h> 121 #include <sys/time.h> 122 #include <sys/resource.h> 123 124 #ifndef RLIMIT_NOFILE 125 #define RLIMIT_NOFILE RLIMIT_OFILE 126 #endif 127 128 #define RPC 129 130 #include <netinet/in.h> 131 #include <arpa/inet.h> 132 133 #include <errno.h> 134 #include <signal.h> 135 #include <netdb.h> 136 #include <syslog.h> 137 #include <pwd.h> 138 #include <grp.h> 139 #include <stdio.h> 140 #include <stdlib.h> 141 #include <string.h> 142 #ifdef RPC 143 #include <rpc/rpc.h> 144 #endif 145 #include "pathnames.h" 146 147 #define TOOMANY 40 /* don't start more than TOOMANY */ 148 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */ 149 #define RETRYTIME (60*10) /* retry after bind or server fail */ 150 151 #define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM)) 152 153 extern int errno; 154 155 void config(), reapchild(), retry(), goaway(); 156 char *index(); 157 158 int debug = 0; 159 int nsock, maxsock; 160 fd_set allsock; 161 int options; 162 int timingout; 163 struct servent *sp; 164 char *curdom; 165 166 #ifndef OPEN_MAX 167 #define OPEN_MAX 64 168 #endif 169 170 /* Reserve some descriptors, 3 stdio + at least: 1 log, 1 conf. file */ 171 #define FD_MARGIN (8) 172 typeof(((struct rlimit *)0)->rlim_cur) rlim_ofile_cur = OPEN_MAX; 173 174 #ifdef RLIMIT_NOFILE 175 struct rlimit rlim_ofile; 176 #endif 177 178 struct servtab { 179 char *se_service; /* name of service */ 180 int se_socktype; /* type of socket to use */ 181 int se_family; /* address family */ 182 char *se_proto; /* protocol used */ 183 int se_rpcprog; /* rpc program number */ 184 int se_rpcversl; /* rpc program lowest version */ 185 int se_rpcversh; /* rpc program highest version */ 186 #define isrpcservice(sep) ((sep)->se_rpcversl != 0) 187 short se_wait; /* single threaded server */ 188 short se_checked; /* looked at during merge */ 189 char *se_user; /* user name to run as */ 190 char *se_group; /* group name to run as */ 191 struct biltin *se_bi; /* if built-in, description */ 192 char *se_server; /* server program */ 193 #define MAXARGV 20 194 char *se_argv[MAXARGV+1]; /* program arguments */ 195 int se_fd; /* open descriptor */ 196 union { 197 struct sockaddr se_un_ctrladdr; 198 struct sockaddr_in se_un_ctrladdr_in; 199 struct sockaddr_un se_un_ctrladdr_un; 200 } se_un; /* bound address */ 201 #define se_ctrladdr se_un.se_un_ctrladdr 202 #define se_ctrladdr_in se_un.se_un_ctrladdr_in 203 #define se_ctrladdr_un se_un.se_un_ctrladdr_un 204 int se_ctrladdr_size; 205 int se_max; /* max # of instances of this service */ 206 int se_count; /* number started since se_time */ 207 struct timeval se_time; /* start of se_count */ 208 #ifdef MULOG 209 int se_log; 210 #define MULOG_RFC931 0x40000000 211 #endif 212 struct servtab *se_next; 213 } *servtab; 214 215 int echo_stream(), discard_stream(), machtime_stream(); 216 int daytime_stream(), chargen_stream(); 217 int echo_dg(), discard_dg(), machtime_dg(), daytime_dg(), chargen_dg(); 218 219 struct biltin { 220 char *bi_service; /* internally provided service name */ 221 int bi_socktype; /* type of socket supported */ 222 short bi_fork; /* 1 if should fork before call */ 223 short bi_wait; /* 1 if should wait for child */ 224 int (*bi_fn)(); /* function which performs it */ 225 } biltins[] = { 226 /* Echo received data */ 227 "echo", SOCK_STREAM, 1, 0, echo_stream, 228 "echo", SOCK_DGRAM, 0, 0, echo_dg, 229 230 /* Internet /dev/null */ 231 "discard", SOCK_STREAM, 1, 0, discard_stream, 232 "discard", SOCK_DGRAM, 0, 0, discard_dg, 233 234 /* Return 32 bit time since 1900 */ 235 "time", SOCK_STREAM, 0, 0, machtime_stream, 236 "time", SOCK_DGRAM, 0, 0, machtime_dg, 237 238 /* Return human-readable time */ 239 "daytime", SOCK_STREAM, 0, 0, daytime_stream, 240 "daytime", SOCK_DGRAM, 0, 0, daytime_dg, 241 242 /* Familiar character generator */ 243 "chargen", SOCK_STREAM, 1, 0, chargen_stream, 244 "chargen", SOCK_DGRAM, 0, 0, chargen_dg, 245 0 246 }; 247 248 #define NUMINT (sizeof(intab) / sizeof(struct inent)) 249 char *CONFIG = _PATH_INETDCONF; 250 char **Argv; 251 char *LastArg; 252 char *progname; 253 254 #ifdef sun 255 /* 256 * Sun's RPC library caches the result of `dtablesize()' 257 * This is incompatible with our "bumping" of file descriptors "on demand" 258 */ 259 int 260 _rpc_dtablesize() 261 { 262 return rlim_ofile_cur; 263 } 264 #endif 265 266 main(argc, argv, envp) 267 int argc; 268 char *argv[], *envp[]; 269 { 270 extern char *optarg; 271 extern int optind; 272 register struct servtab *sep; 273 register struct passwd *pwd; 274 register struct group *grp; 275 register int tmpint; 276 struct sigvec sv; 277 int ch, pid, dofork; 278 char buf[50]; 279 280 Argv = argv; 281 if (envp == 0 || *envp == 0) 282 envp = argv; 283 while (*envp) 284 envp++; 285 LastArg = envp[-1] + strlen(envp[-1]); 286 287 progname = strrchr(argv[0], '/'); 288 progname = progname ? progname + 1 : argv[0]; 289 290 while ((ch = getopt(argc, argv, "d")) != EOF) 291 switch(ch) { 292 case 'd': 293 debug = 1; 294 options |= SO_DEBUG; 295 break; 296 case '?': 297 default: 298 fprintf(stderr, "usage: %s [-d] [conf]", progname); 299 exit(1); 300 } 301 argc -= optind; 302 argv += optind; 303 304 if (argc > 0) 305 CONFIG = argv[0]; 306 307 if (debug == 0) 308 daemon(0, 0); 309 openlog(progname, LOG_PID | LOG_NOWAIT, LOG_DAEMON); 310 logpid(); 311 312 #ifdef RLIMIT_NOFILE 313 if (getrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) { 314 syslog(LOG_ERR, "getrlimit: %m"); 315 } else { 316 rlim_ofile_cur = rlim_ofile.rlim_cur; 317 if (rlim_ofile_cur == RLIM_INFINITY) /* ! */ 318 rlim_ofile_cur = OPEN_MAX; 319 } 320 #endif 321 322 bzero((char *)&sv, sizeof(sv)); 323 sv.sv_mask = SIGBLOCK; 324 sv.sv_handler = retry; 325 sigvec(SIGALRM, &sv, (struct sigvec *)0); 326 config(); 327 sv.sv_handler = config; 328 sigvec(SIGHUP, &sv, (struct sigvec *)0); 329 sv.sv_handler = reapchild; 330 sigvec(SIGCHLD, &sv, (struct sigvec *)0); 331 sv.sv_handler = goaway; 332 sigvec(SIGTERM, &sv, (struct sigvec *)0); 333 sv.sv_handler = goaway; 334 sigvec(SIGINT, &sv, (struct sigvec *)0); 335 336 { 337 /* space for daemons to overwrite environment for ps */ 338 #define DUMMYSIZE 100 339 char dummy[DUMMYSIZE]; 340 341 (void)memset(dummy, 'x', DUMMYSIZE - 1); 342 dummy[DUMMYSIZE - 1] = '\0'; 343 344 (void)setenv("inetd_dummy", dummy, 1); 345 } 346 347 for (;;) { 348 int n, ctrl; 349 fd_set readable; 350 351 if (nsock == 0) { 352 (void) sigblock(SIGBLOCK); 353 while (nsock == 0) 354 sigpause(0L); 355 (void) sigsetmask(0L); 356 } 357 readable = allsock; 358 if ((n = select(maxsock + 1, &readable, (fd_set *)0, 359 (fd_set *)0, (struct timeval *)0)) <= 0) { 360 if (n < 0 && errno != EINTR) 361 syslog(LOG_WARNING, "select: %m\n"); 362 sleep(1); 363 continue; 364 } 365 for (sep = servtab; n && sep; sep = sep->se_next) 366 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) { 367 n--; 368 if (debug) 369 fprintf(stderr, "someone wants %s\n", sep->se_service); 370 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 371 ctrl = accept(sep->se_fd, (struct sockaddr *)0, 372 (int *)0); 373 if (debug) 374 fprintf(stderr, "accept, ctrl %d\n", ctrl); 375 if (ctrl < 0) { 376 if (errno == EINTR) 377 continue; 378 syslog(LOG_WARNING, "accept (for %s): %m", 379 sep->se_service); 380 continue; 381 } 382 } else 383 ctrl = sep->se_fd; 384 (void) sigblock(SIGBLOCK); 385 pid = 0; 386 dofork = (sep->se_bi == 0 || sep->se_bi->bi_fork); 387 if (dofork) { 388 if (sep->se_count++ == 0) 389 (void)gettimeofday(&sep->se_time, 390 (struct timezone *)0); 391 else if (sep->se_count >= sep->se_max) { 392 struct timeval now; 393 394 (void)gettimeofday(&now, (struct timezone *)0); 395 if (now.tv_sec - sep->se_time.tv_sec > 396 CNT_INTVL) { 397 sep->se_time = now; 398 sep->se_count = 1; 399 } else { 400 syslog(LOG_ERR, 401 "%s/%s server failing (looping), service terminated\n", 402 sep->se_service, sep->se_proto); 403 FD_CLR(sep->se_fd, &allsock); 404 (void) close(sep->se_fd); 405 sep->se_fd = -1; 406 sep->se_count = 0; 407 nsock--; 408 sigsetmask(0L); 409 if (!timingout) { 410 timingout = 1; 411 alarm(RETRYTIME); 412 } 413 continue; 414 } 415 } 416 pid = fork(); 417 } 418 if (pid < 0) { 419 syslog(LOG_ERR, "fork: %m"); 420 if (sep->se_socktype == SOCK_STREAM) 421 close(ctrl); 422 sigsetmask(0L); 423 sleep(1); 424 continue; 425 } 426 if (pid && sep->se_wait) { 427 sep->se_wait = pid; 428 FD_CLR(sep->se_fd, &allsock); 429 nsock--; 430 } 431 sigsetmask(0L); 432 if (pid == 0) { 433 if (debug && dofork) 434 setsid(); 435 if (sep->se_bi) 436 (*sep->se_bi->bi_fn)(ctrl, sep); 437 else { 438 if ((pwd = getpwnam(sep->se_user)) == NULL) { 439 syslog(LOG_ERR, 440 "getpwnam: %s: No such user", 441 sep->se_user); 442 if (sep->se_socktype != SOCK_STREAM) 443 recv(0, buf, sizeof (buf), 0); 444 _exit(1); 445 } 446 if (sep->se_group && 447 (grp = getgrnam(sep->se_group)) == NULL) { 448 syslog(LOG_ERR, 449 "getgrnam: %s: No such group", 450 sep->se_group); 451 if (sep->se_socktype != SOCK_STREAM) 452 recv(0, buf, sizeof (buf), 0); 453 _exit(1); 454 } 455 if (pwd->pw_uid) { 456 if (sep->se_group) 457 pwd->pw_gid = grp->gr_gid; 458 (void) setgid((gid_t)pwd->pw_gid); 459 initgroups(pwd->pw_name, pwd->pw_gid); 460 (void) setuid((uid_t)pwd->pw_uid); 461 } else if (sep->se_group) { 462 (void) setgid((gid_t)grp->gr_gid); 463 } 464 if (debug) 465 fprintf(stderr, "%d execl %s\n", 466 getpid(), sep->se_server); 467 #ifdef MULOG 468 if (sep->se_log) 469 dolog(sep, ctrl); 470 #endif 471 dup2(ctrl, 0); 472 close(ctrl); 473 dup2(0, 1); 474 dup2(0, 2); 475 #ifdef RLIMIT_NOFILE 476 if (rlim_ofile.rlim_cur != rlim_ofile_cur) { 477 if (setrlimit(RLIMIT_NOFILE, 478 &rlim_ofile) < 0) 479 syslog(LOG_ERR,"setrlimit: %m"); 480 } 481 #endif 482 for (tmpint = rlim_ofile_cur-1; --tmpint > 2; ) 483 (void)close(tmpint); 484 execv(sep->se_server, sep->se_argv); 485 if (sep->se_socktype != SOCK_STREAM) 486 recv(0, buf, sizeof (buf), 0); 487 syslog(LOG_ERR, "execv %s: %m", sep->se_server); 488 _exit(1); 489 } 490 } 491 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 492 close(ctrl); 493 } 494 } 495 } 496 497 void 498 reapchild() 499 { 500 int status; 501 int pid; 502 register struct servtab *sep; 503 504 for (;;) { 505 pid = wait3(&status, WNOHANG, (struct rusage *)0); 506 if (pid <= 0) 507 break; 508 if (debug) 509 fprintf(stderr, "%d reaped\n", pid); 510 for (sep = servtab; sep; sep = sep->se_next) 511 if (sep->se_wait == pid) { 512 if (WIFEXITED(status) && WEXITSTATUS(status)) 513 syslog(LOG_WARNING, 514 "%s: exit status 0x%x", 515 sep->se_server, WEXITSTATUS(status)); 516 else if (WIFSIGNALED(status)) 517 syslog(LOG_WARNING, 518 "%s: exit signal 0x%x", 519 sep->se_server, WTERMSIG(status)); 520 sep->se_wait = 1; 521 FD_SET(sep->se_fd, &allsock); 522 nsock++; 523 if (debug) 524 fprintf(stderr, "restored %s, fd %d\n", 525 sep->se_service, sep->se_fd); 526 } 527 } 528 } 529 530 void 531 config() 532 { 533 register struct servtab *sep, *cp, **sepp; 534 struct servtab *getconfigent(), *enter(); 535 long omask; 536 int n; 537 538 if (!setconfig()) { 539 syslog(LOG_ERR, "%s: %m", CONFIG); 540 return; 541 } 542 for (sep = servtab; sep; sep = sep->se_next) 543 sep->se_checked = 0; 544 while (cp = getconfigent()) { 545 for (sep = servtab; sep; sep = sep->se_next) 546 if (strcmp(sep->se_service, cp->se_service) == 0 && 547 strcmp(sep->se_proto, cp->se_proto) == 0) 548 break; 549 if (sep != 0) { 550 int i; 551 552 #define SWAP(type, a, b) {type c=(type)a; (type)a=(type)b; (type)b=(type)c;} 553 554 omask = sigblock(SIGBLOCK); 555 /* 556 * sep->se_wait may be holding the pid of a daemon 557 * that we're waiting for. If so, don't overwrite 558 * it unless the config file explicitly says don't 559 * wait. 560 */ 561 if (cp->se_bi == 0 && 562 (sep->se_wait == 1 || cp->se_wait == 0)) 563 sep->se_wait = cp->se_wait; 564 SWAP(int, cp->se_max, sep->se_max); 565 SWAP(char *, sep->se_user, cp->se_user); 566 SWAP(char *, sep->se_group, cp->se_group); 567 SWAP(char *, sep->se_server, cp->se_server); 568 for (i = 0; i < MAXARGV; i++) 569 SWAP(char *, sep->se_argv[i], cp->se_argv[i]); 570 #undef SWAP 571 if (isrpcservice(sep)) 572 unregister_rpc(sep); 573 sep->se_rpcversl = cp->se_rpcversl; 574 sep->se_rpcversh = cp->se_rpcversh; 575 sigsetmask(omask); 576 freeconfig(cp); 577 if (debug) 578 print_service("REDO", sep); 579 } else { 580 sep = enter(cp); 581 if (debug) 582 print_service("ADD ", sep); 583 } 584 sep->se_checked = 1; 585 586 switch (sep->se_family) { 587 case AF_UNIX: 588 if (sep->se_fd != -1) 589 break; 590 (void)unlink(sep->se_service); 591 n = strlen(sep->se_service); 592 if (n > sizeof sep->se_ctrladdr_un.sun_path - 1) 593 n = sizeof sep->se_ctrladdr_un.sun_path - 1; 594 strncpy(sep->se_ctrladdr_un.sun_path, sep->se_service, n); 595 sep->se_ctrladdr_un.sun_family = AF_UNIX; 596 sep->se_ctrladdr_size = n + 597 sizeof sep->se_ctrladdr_un.sun_family; 598 setup(sep); 599 break; 600 case AF_INET: 601 sep->se_ctrladdr_in.sin_family = AF_INET; 602 sep->se_ctrladdr_size = sizeof sep->se_ctrladdr_in; 603 if (isrpcservice(sep)) { 604 struct rpcent *rp; 605 606 sep->se_rpcprog = atoi(sep->se_service); 607 if (sep->se_rpcprog == 0) { 608 rp = getrpcbyname(sep->se_service); 609 if (rp == 0) { 610 syslog(LOG_ERR, 611 "%s: unknown service", 612 sep->se_service); 613 continue; 614 } 615 sep->se_rpcprog = rp->r_number; 616 } 617 if (sep->se_fd == -1) 618 setup(sep); 619 if (sep->se_fd != -1) 620 register_rpc(sep); 621 } else { 622 u_short port = htons(atoi(sep->se_service)); 623 624 if (!port) { 625 sp = getservbyname(sep->se_service, 626 sep->se_proto); 627 if (sp == 0) { 628 syslog(LOG_ERR, 629 "%s/%s: unknown service", 630 sep->se_service, sep->se_proto); 631 continue; 632 } 633 port = sp->s_port; 634 } 635 if (port != sep->se_ctrladdr_in.sin_port) { 636 sep->se_ctrladdr_in.sin_port = port; 637 if (sep->se_fd != -1) { 638 FD_CLR(sep->se_fd, &allsock); 639 nsock--; 640 (void) close(sep->se_fd); 641 } 642 sep->se_fd = -1; 643 } 644 if (sep->se_fd == -1) 645 setup(sep); 646 } 647 } 648 } 649 endconfig(); 650 /* 651 * Purge anything not looked at above. 652 */ 653 omask = sigblock(SIGBLOCK); 654 sepp = &servtab; 655 while (sep = *sepp) { 656 if (sep->se_checked) { 657 sepp = &sep->se_next; 658 continue; 659 } 660 *sepp = sep->se_next; 661 if (sep->se_fd != -1) { 662 FD_CLR(sep->se_fd, &allsock); 663 nsock--; 664 (void) close(sep->se_fd); 665 } 666 if (isrpcservice(sep)) 667 unregister_rpc(sep); 668 if (sep->se_family == AF_UNIX) 669 (void)unlink(sep->se_service); 670 if (debug) 671 print_service("FREE", sep); 672 freeconfig(sep); 673 free((char *)sep); 674 } 675 (void) sigsetmask(omask); 676 } 677 678 void 679 retry() 680 { 681 register struct servtab *sep; 682 683 timingout = 0; 684 for (sep = servtab; sep; sep = sep->se_next) { 685 if (sep->se_fd == -1) { 686 switch (sep->se_family) { 687 case AF_UNIX: 688 case AF_INET: 689 setup(sep); 690 if (sep->se_fd != -1 && isrpcservice(sep)) 691 register_rpc(sep); 692 break; 693 } 694 } 695 } 696 } 697 698 void 699 goaway() 700 { 701 register struct servtab *sep; 702 703 for (sep = servtab; sep; sep = sep->se_next) { 704 if (sep->se_fd == -1) 705 continue; 706 707 switch (sep->se_family) { 708 case AF_UNIX: 709 (void)unlink(sep->se_service); 710 break; 711 case AF_INET: 712 if (sep->se_wait == 1 && isrpcservice(sep)) 713 unregister_rpc(sep); 714 break; 715 } 716 (void)close(sep->se_fd); 717 } 718 (void)unlink(_PATH_INETDPID); 719 exit(0); 720 } 721 722 723 setup(sep) 724 register struct servtab *sep; 725 { 726 int on = 1; 727 728 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) { 729 syslog(LOG_ERR, "%s/%s: socket: %m", 730 sep->se_service, sep->se_proto); 731 return; 732 } 733 #define turnon(fd, opt) \ 734 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 735 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 736 turnon(sep->se_fd, SO_DEBUG) < 0) 737 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 738 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 739 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 740 #undef turnon 741 if (bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size) < 0) { 742 syslog(LOG_ERR, "%s/%s: bind: %m", 743 sep->se_service, sep->se_proto); 744 (void) close(sep->se_fd); 745 sep->se_fd = -1; 746 if (!timingout) { 747 timingout = 1; 748 alarm(RETRYTIME); 749 } 750 return; 751 } 752 if (sep->se_socktype == SOCK_STREAM) 753 listen(sep->se_fd, 10); 754 755 FD_SET(sep->se_fd, &allsock); 756 nsock++; 757 if (sep->se_fd > maxsock) { 758 maxsock = sep->se_fd; 759 if (maxsock > rlim_ofile_cur - FD_MARGIN) 760 bump_nofile(); 761 } 762 } 763 764 register_rpc(sep) 765 register struct servtab *sep; 766 { 767 #ifdef RPC 768 int n; 769 struct sockaddr_in sin; 770 struct protoent *pp; 771 772 if ((pp = getprotobyname(sep->se_proto+4)) == NULL) { 773 syslog(LOG_ERR, "%s: getproto: %m", 774 sep->se_proto); 775 return; 776 } 777 n = sizeof sin; 778 if (getsockname(sep->se_fd, (struct sockaddr *)&sin, &n) < 0) { 779 syslog(LOG_ERR, "%s/%s: getsockname: %m", 780 sep->se_service, sep->se_proto); 781 return; 782 } 783 784 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 785 if (debug) 786 fprintf(stderr, "pmap_set: %u %u %u %u\n", 787 sep->se_rpcprog, n, pp->p_proto, ntohs(sin.sin_port)); 788 (void)pmap_unset(sep->se_rpcprog, n); 789 if (!pmap_set(sep->se_rpcprog, n, pp->p_proto, ntohs(sin.sin_port))) 790 syslog(LOG_ERR, "pmap_set: %u %u %u %u: %m", 791 sep->se_rpcprog, n, pp->p_proto, ntohs(sin.sin_port)); 792 } 793 #endif /* RPC */ 794 } 795 796 unregister_rpc(sep) 797 register struct servtab *sep; 798 { 799 #ifdef RPC 800 int n; 801 802 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 803 if (debug) 804 fprintf(stderr, "pmap_unset(%u, %u)\n", 805 sep->se_rpcprog, n); 806 if (!pmap_unset(sep->se_rpcprog, n)) 807 syslog(LOG_ERR, "pmap_unset(%u, %u)\n", 808 sep->se_rpcprog, n); 809 } 810 #endif /* RPC */ 811 } 812 813 814 struct servtab * 815 enter(cp) 816 struct servtab *cp; 817 { 818 register struct servtab *sep; 819 long omask; 820 821 sep = (struct servtab *)malloc(sizeof (*sep)); 822 if (sep == (struct servtab *)0) { 823 syslog(LOG_ERR, "Out of memory."); 824 exit(-1); 825 } 826 *sep = *cp; 827 sep->se_fd = -1; 828 sep->se_rpcprog = -1; 829 omask = sigblock(SIGBLOCK); 830 sep->se_next = servtab; 831 servtab = sep; 832 sigsetmask(omask); 833 return (sep); 834 } 835 836 FILE *fconfig = NULL; 837 struct servtab serv; 838 char line[256]; 839 char *skip(), *nextline(); 840 841 setconfig() 842 { 843 844 if (fconfig != NULL) { 845 fseek(fconfig, 0L, L_SET); 846 return (1); 847 } 848 fconfig = fopen(CONFIG, "r"); 849 return (fconfig != NULL); 850 } 851 852 endconfig() 853 { 854 if (fconfig) { 855 (void) fclose(fconfig); 856 fconfig = NULL; 857 } 858 } 859 860 struct servtab * 861 getconfigent() 862 { 863 register struct servtab *sep = &serv; 864 int argc; 865 char *cp, *arg, *newstr(); 866 867 more: 868 #ifdef MULOG 869 while ((cp = nextline(fconfig)) && *cp == '#') { 870 /* Avoid use of `skip' if there is a danger of it looking 871 * at continuation lines. 872 */ 873 do { 874 cp++; 875 } while (*cp == ' ' || *cp == '\t'); 876 if (*cp == '\0') 877 continue; 878 if ((arg = skip(&cp)) == NULL) 879 continue; 880 if (strcmp(arg, "DOMAIN")) 881 continue; 882 if (curdom) 883 free(curdom); 884 curdom = NULL; 885 while (*cp == ' ' || *cp == '\t') 886 cp++; 887 if (*cp == '\0') 888 continue; 889 arg = cp; 890 while (*cp && *cp != ' ' && *cp != '\t') 891 cp++; 892 if (*cp != '\0') 893 *cp++ = '\0'; 894 curdom = newstr(arg); 895 } 896 #else 897 while ((cp = nextline(fconfig)) && *cp == '#') 898 ; 899 #endif 900 if (cp == NULL) 901 return ((struct servtab *)0); 902 bzero((char *)sep, sizeof *sep); 903 sep->se_service = newstr(skip(&cp)); 904 arg = skip(&cp); 905 if (arg == NULL) 906 goto more; 907 908 if (strcmp(arg, "stream") == 0) 909 sep->se_socktype = SOCK_STREAM; 910 else if (strcmp(arg, "dgram") == 0) 911 sep->se_socktype = SOCK_DGRAM; 912 else if (strcmp(arg, "rdm") == 0) 913 sep->se_socktype = SOCK_RDM; 914 else if (strcmp(arg, "seqpacket") == 0) 915 sep->se_socktype = SOCK_SEQPACKET; 916 else if (strcmp(arg, "raw") == 0) 917 sep->se_socktype = SOCK_RAW; 918 else 919 sep->se_socktype = -1; 920 921 sep->se_proto = newstr(skip(&cp)); 922 if (strcmp(sep->se_proto, "unix") == 0) { 923 sep->se_family = AF_UNIX; 924 } else { 925 sep->se_family = AF_INET; 926 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 927 #ifdef RPC 928 char *cp, *ccp; 929 cp = index(sep->se_service, '/'); 930 if (cp == 0) { 931 syslog(LOG_ERR, "%s: no rpc version", 932 sep->se_service); 933 goto more; 934 } 935 *cp++ = '\0'; 936 sep->se_rpcversl = 937 sep->se_rpcversh = strtol(cp, &ccp, 0); 938 if (ccp == cp) { 939 badafterall: 940 syslog(LOG_ERR, "%s/%s: bad rpc version", 941 sep->se_service, cp); 942 goto more; 943 } 944 if (*ccp == '-') { 945 cp = ccp + 1; 946 sep->se_rpcversh = strtol(cp, &ccp, 0); 947 if (ccp == cp) 948 goto badafterall; 949 } 950 #else 951 syslog(LOG_ERR, "%s: rpc services not suported", 952 sep->se_service); 953 goto more; 954 #endif /* RPC */ 955 } 956 } 957 arg = skip(&cp); 958 if (arg == NULL) 959 goto more; 960 { 961 char *s = index(arg, '.'); 962 if (s) { 963 *s++ = '\0'; 964 sep->se_max = atoi(s); 965 } else 966 sep->se_max = TOOMANY; 967 } 968 sep->se_wait = strcmp(arg, "wait") == 0; 969 sep->se_user = newstr(skip(&cp)); 970 if (sep->se_group = index(sep->se_user, '.')) { 971 *sep->se_group++ = '\0'; 972 } 973 sep->se_server = newstr(skip(&cp)); 974 if (strcmp(sep->se_server, "internal") == 0) { 975 register struct biltin *bi; 976 977 for (bi = biltins; bi->bi_service; bi++) 978 if (bi->bi_socktype == sep->se_socktype && 979 strcmp(bi->bi_service, sep->se_service) == 0) 980 break; 981 if (bi->bi_service == 0) { 982 syslog(LOG_ERR, "internal service %s unknown\n", 983 sep->se_service); 984 goto more; 985 } 986 sep->se_bi = bi; 987 sep->se_wait = bi->bi_wait; 988 } else 989 sep->se_bi = NULL; 990 argc = 0; 991 for (arg = skip(&cp); cp; arg = skip(&cp)) { 992 #if MULOG 993 char *colon, *rindex(); 994 995 if (argc == 0 && (colon = rindex(arg, ':'))) { 996 while (arg < colon) { 997 int x; 998 char *ccp; 999 1000 switch (*arg++) { 1001 case 'l': 1002 x = 1; 1003 if (isdigit(*arg)) { 1004 x = strtol(arg, &ccp, 0); 1005 if (ccp == arg) 1006 break; 1007 arg = ccp; 1008 } 1009 sep->se_log &= ~MULOG_RFC931; 1010 sep->se_log |= x; 1011 break; 1012 case 'a': 1013 sep->se_log |= MULOG_RFC931; 1014 break; 1015 default: 1016 break; 1017 } 1018 } 1019 arg = colon + 1; 1020 } 1021 #endif 1022 if (argc < MAXARGV) 1023 sep->se_argv[argc++] = newstr(arg); 1024 } 1025 while (argc <= MAXARGV) 1026 sep->se_argv[argc++] = NULL; 1027 return (sep); 1028 } 1029 1030 freeconfig(cp) 1031 register struct servtab *cp; 1032 { 1033 int i; 1034 1035 if (cp->se_service) 1036 free(cp->se_service); 1037 if (cp->se_proto) 1038 free(cp->se_proto); 1039 if (cp->se_user) 1040 free(cp->se_user); 1041 /* Note: se_group is part of the newstr'ed se_user */ 1042 if (cp->se_server) 1043 free(cp->se_server); 1044 for (i = 0; i < MAXARGV; i++) 1045 if (cp->se_argv[i]) 1046 free(cp->se_argv[i]); 1047 } 1048 1049 char * 1050 skip(cpp) 1051 char **cpp; 1052 { 1053 register char *cp = *cpp; 1054 char *start; 1055 1056 if (*cpp == NULL) 1057 return ((char *)0); 1058 1059 again: 1060 while (*cp == ' ' || *cp == '\t') 1061 cp++; 1062 if (*cp == '\0') { 1063 int c; 1064 1065 c = getc(fconfig); 1066 (void) ungetc(c, fconfig); 1067 if (c == ' ' || c == '\t') 1068 if (cp = nextline(fconfig)) 1069 goto again; 1070 *cpp = (char *)0; 1071 return ((char *)0); 1072 } 1073 start = cp; 1074 while (*cp && *cp != ' ' && *cp != '\t') 1075 cp++; 1076 if (*cp != '\0') 1077 *cp++ = '\0'; 1078 *cpp = cp; 1079 return (start); 1080 } 1081 1082 char * 1083 nextline(fd) 1084 FILE *fd; 1085 { 1086 char *cp; 1087 1088 if (fgets(line, sizeof (line), fd) == NULL) 1089 return ((char *)0); 1090 cp = index(line, '\n'); 1091 if (cp) 1092 *cp = '\0'; 1093 return (line); 1094 } 1095 1096 char * 1097 newstr(cp) 1098 char *cp; 1099 { 1100 if (cp = strdup(cp ? cp : "")) 1101 return(cp); 1102 syslog(LOG_ERR, "strdup: %m"); 1103 exit(-1); 1104 } 1105 1106 inetd_setproctitle(a, s) 1107 char *a; 1108 int s; 1109 { 1110 int size; 1111 register char *cp; 1112 struct sockaddr_in sin; 1113 char buf[80]; 1114 1115 cp = Argv[0]; 1116 size = sizeof(sin); 1117 if (getpeername(s, (struct sockaddr *)&sin, &size) == 0) 1118 (void) sprintf(buf, "-%s [%s]", a, inet_ntoa(sin.sin_addr)); 1119 else 1120 (void) sprintf(buf, "-%s", a); 1121 strncpy(cp, buf, LastArg - cp); 1122 cp += strlen(cp); 1123 while (cp < LastArg) 1124 *cp++ = ' '; 1125 } 1126 1127 logpid() 1128 { 1129 FILE *fp; 1130 1131 if ((fp = fopen(_PATH_INETDPID, "w")) != NULL) { 1132 fprintf(fp, "%u\n", getpid()); 1133 (void)fclose(fp); 1134 } 1135 } 1136 1137 bump_nofile() 1138 { 1139 #ifdef RLIMIT_NOFILE 1140 1141 #define FD_CHUNK 32 1142 1143 struct rlimit rl; 1144 1145 if (getrlimit(RLIMIT_NOFILE, &rl) < 0) { 1146 syslog(LOG_ERR, "getrlimit: %m"); 1147 return -1; 1148 } 1149 rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK); 1150 if (rl.rlim_cur <= rlim_ofile_cur) { 1151 syslog(LOG_ERR, 1152 "bump_nofile: cannot extend file limit, max = %d", 1153 rl.rlim_cur); 1154 return -1; 1155 } 1156 1157 if (setrlimit(RLIMIT_NOFILE, &rl) < 0) { 1158 syslog(LOG_ERR, "setrlimit: %m"); 1159 return -1; 1160 } 1161 1162 rlim_ofile_cur = rl.rlim_cur; 1163 return 0; 1164 1165 #else 1166 syslog(LOG_ERR, "bump_nofile: cannot extend file limit"); 1167 return -1; 1168 #endif 1169 } 1170 1171 /* 1172 * Internet services provided internally by inetd: 1173 */ 1174 #define BUFSIZE 4096 1175 1176 /* ARGSUSED */ 1177 echo_stream(s, sep) /* Echo service -- echo data back */ 1178 int s; 1179 struct servtab *sep; 1180 { 1181 char buffer[BUFSIZE]; 1182 int i; 1183 1184 inetd_setproctitle(sep->se_service, s); 1185 while ((i = read(s, buffer, sizeof(buffer))) > 0 && 1186 write(s, buffer, i) > 0) 1187 ; 1188 exit(0); 1189 } 1190 1191 /* ARGSUSED */ 1192 echo_dg(s, sep) /* Echo service -- echo data back */ 1193 int s; 1194 struct servtab *sep; 1195 { 1196 char buffer[BUFSIZE]; 1197 int i, size; 1198 struct sockaddr sa; 1199 1200 size = sizeof(sa); 1201 if ((i = recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size)) < 0) 1202 return; 1203 (void) sendto(s, buffer, i, 0, &sa, sizeof(sa)); 1204 } 1205 1206 /* ARGSUSED */ 1207 discard_stream(s, sep) /* Discard service -- ignore data */ 1208 int s; 1209 struct servtab *sep; 1210 { 1211 char buffer[BUFSIZE]; 1212 1213 inetd_setproctitle(sep->se_service, s); 1214 while ((errno = 0, read(s, buffer, sizeof(buffer)) > 0) || 1215 errno == EINTR) 1216 ; 1217 exit(0); 1218 } 1219 1220 /* ARGSUSED */ 1221 discard_dg(s, sep) /* Discard service -- ignore data */ 1222 int s; 1223 struct servtab *sep; 1224 { 1225 char buffer[BUFSIZE]; 1226 1227 (void) read(s, buffer, sizeof(buffer)); 1228 } 1229 1230 #include <ctype.h> 1231 #define LINESIZ 72 1232 char ring[128]; 1233 char *endring; 1234 1235 initring() 1236 { 1237 register int i; 1238 1239 endring = ring; 1240 1241 for (i = 0; i <= 128; ++i) 1242 if (isprint(i)) 1243 *endring++ = i; 1244 } 1245 1246 /* ARGSUSED */ 1247 chargen_stream(s, sep) /* Character generator */ 1248 int s; 1249 struct servtab *sep; 1250 { 1251 register char *rs; 1252 int len; 1253 char text[LINESIZ+2]; 1254 1255 inetd_setproctitle(sep->se_service, s); 1256 1257 if (!endring) { 1258 initring(); 1259 rs = ring; 1260 } 1261 1262 text[LINESIZ] = '\r'; 1263 text[LINESIZ + 1] = '\n'; 1264 for (rs = ring;;) { 1265 if ((len = endring - rs) >= LINESIZ) 1266 bcopy(rs, text, LINESIZ); 1267 else { 1268 bcopy(rs, text, len); 1269 bcopy(ring, text + len, LINESIZ - len); 1270 } 1271 if (++rs == endring) 1272 rs = ring; 1273 if (write(s, text, sizeof(text)) != sizeof(text)) 1274 break; 1275 } 1276 exit(0); 1277 } 1278 1279 /* ARGSUSED */ 1280 chargen_dg(s, sep) /* Character generator */ 1281 int s; 1282 struct servtab *sep; 1283 { 1284 struct sockaddr sa; 1285 static char *rs; 1286 int len, size; 1287 char text[LINESIZ+2]; 1288 1289 if (endring == 0) { 1290 initring(); 1291 rs = ring; 1292 } 1293 1294 size = sizeof(sa); 1295 if (recvfrom(s, text, sizeof(text), 0, &sa, &size) < 0) 1296 return; 1297 1298 if ((len = endring - rs) >= LINESIZ) 1299 bcopy(rs, text, LINESIZ); 1300 else { 1301 bcopy(rs, text, len); 1302 bcopy(ring, text + len, LINESIZ - len); 1303 } 1304 if (++rs == endring) 1305 rs = ring; 1306 text[LINESIZ] = '\r'; 1307 text[LINESIZ + 1] = '\n'; 1308 (void) sendto(s, text, sizeof(text), 0, &sa, sizeof(sa)); 1309 } 1310 1311 /* 1312 * Return a machine readable date and time, in the form of the 1313 * number of seconds since midnight, Jan 1, 1900. Since gettimeofday 1314 * returns the number of seconds since midnight, Jan 1, 1970, 1315 * we must add 2208988800 seconds to this figure to make up for 1316 * some seventy years Bell Labs was asleep. 1317 */ 1318 1319 long 1320 machtime() 1321 { 1322 struct timeval tv; 1323 1324 if (gettimeofday(&tv, (struct timezone *)0) < 0) { 1325 fprintf(stderr, "Unable to get time of day\n"); 1326 return (0L); 1327 } 1328 return (htonl((long)tv.tv_sec + 2208988800UL)); 1329 } 1330 1331 /* ARGSUSED */ 1332 machtime_stream(s, sep) 1333 int s; 1334 struct servtab *sep; 1335 { 1336 long result; 1337 1338 result = machtime(); 1339 (void) write(s, (char *) &result, sizeof(result)); 1340 } 1341 1342 /* ARGSUSED */ 1343 machtime_dg(s, sep) 1344 int s; 1345 struct servtab *sep; 1346 { 1347 long result; 1348 struct sockaddr sa; 1349 int size; 1350 1351 size = sizeof(sa); 1352 if (recvfrom(s, (char *)&result, sizeof(result), 0, &sa, &size) < 0) 1353 return; 1354 result = machtime(); 1355 (void) sendto(s, (char *) &result, sizeof(result), 0, &sa, sizeof(sa)); 1356 } 1357 1358 /* ARGSUSED */ 1359 daytime_stream(s, sep) /* Return human-readable time of day */ 1360 int s; 1361 struct servtab *sep; 1362 { 1363 char buffer[256]; 1364 time_t time(), clock; 1365 1366 clock = time((time_t *) 0); 1367 1368 (void) sprintf(buffer, "%.24s\r\n", ctime(&clock)); 1369 (void) write(s, buffer, strlen(buffer)); 1370 } 1371 1372 /* ARGSUSED */ 1373 daytime_dg(s, sep) /* Return human-readable time of day */ 1374 int s; 1375 struct servtab *sep; 1376 { 1377 char buffer[256]; 1378 time_t time(), clock; 1379 struct sockaddr sa; 1380 int size; 1381 1382 clock = time((time_t *) 0); 1383 1384 size = sizeof(sa); 1385 if (recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size) < 0) 1386 return; 1387 (void) sprintf(buffer, "%.24s\r\n", ctime(&clock)); 1388 (void) sendto(s, buffer, strlen(buffer), 0, &sa, sizeof(sa)); 1389 } 1390 1391 /* 1392 * print_service: 1393 * Dump relevant information to stderr 1394 */ 1395 print_service(action, sep) 1396 char *action; 1397 struct servtab *sep; 1398 { 1399 if (isrpcservice(sep)) 1400 fprintf(stderr, 1401 "%s: %s rpcprog=%d, rpcvers = %d/%d, proto=%s, wait.max=%d.%d, user.group=%s.%s builtin=%lx server=%s\n", 1402 action, sep->se_service, 1403 sep->se_rpcprog, sep->se_rpcversh, sep->se_rpcversl, sep->se_proto, 1404 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 1405 (long)sep->se_bi, sep->se_server); 1406 else 1407 fprintf(stderr, 1408 "%s: %s proto=%s, wait.max=%d.%d, user.group=%s.%s builtin=%lx server=%s\n", 1409 action, sep->se_service, sep->se_proto, 1410 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 1411 (long)sep->se_bi, sep->se_server); 1412 } 1413 1414 #ifdef MULOG 1415 dolog(sep, ctrl) 1416 struct servtab *sep; 1417 int ctrl; 1418 { 1419 struct sockaddr sa; 1420 struct sockaddr_in *sin = (struct sockaddr_in *)&sa; 1421 int len = sizeof(sa); 1422 struct hostent *hp; 1423 char *host, *dp, buf[BUFSIZ], *rfc931_name(); 1424 int connected = 1; 1425 1426 if (sep->se_family != AF_INET) 1427 return; 1428 1429 if (getpeername(ctrl, &sa, &len) < 0) { 1430 if (errno != ENOTCONN) { 1431 syslog(LOG_ERR, "getpeername: %m"); 1432 return; 1433 } 1434 if (recvfrom(ctrl, buf, sizeof(buf), MSG_PEEK, &sa, &len) < 0) { 1435 syslog(LOG_ERR, "recvfrom: %m"); 1436 return; 1437 } 1438 connected = 0; 1439 } 1440 if (sa.sa_family != AF_INET) { 1441 syslog(LOG_ERR, "unexpected address family %u", sa.sa_family); 1442 return; 1443 } 1444 1445 hp = gethostbyaddr((char *) &sin->sin_addr.s_addr, 1446 sizeof (sin->sin_addr.s_addr), AF_INET); 1447 1448 host = hp?hp->h_name:inet_ntoa(sin->sin_addr); 1449 1450 switch (sep->se_log & ~MULOG_RFC931) { 1451 case 0: 1452 return; 1453 case 1: 1454 if (curdom == NULL || *curdom == '\0') 1455 break; 1456 dp = host + strlen(host) - strlen(curdom); 1457 if (dp < host) 1458 break; 1459 if (debug) 1460 fprintf(stderr, "check \"%s\" against curdom \"%s\"\n", 1461 host, curdom); 1462 if (strcasecmp(dp, curdom) == 0) 1463 return; 1464 break; 1465 case 2: 1466 default: 1467 break; 1468 } 1469 1470 openlog("", LOG_NOWAIT, MULOG); 1471 1472 if (connected && (sep->se_log & MULOG_RFC931)) 1473 syslog(LOG_INFO, "%s@%s wants %s", 1474 rfc931_name(sin, ctrl), host, sep->se_service); 1475 else 1476 syslog(LOG_INFO, "%s wants %s", 1477 host, sep->se_service); 1478 } 1479 /* 1480 * From tcp_log by 1481 * Wietse Venema, Eindhoven University of Technology, The Netherlands. 1482 */ 1483 #if 0 1484 static char sccsid[] = "@(#) rfc931.c 1.3 92/08/31 22:54:46"; 1485 #endif 1486 1487 #include <setjmp.h> 1488 1489 #define RFC931_PORT 113 /* Semi-well-known port */ 1490 #define TIMEOUT 4 1491 #define TIMEOUT2 10 1492 1493 static jmp_buf timebuf; 1494 1495 /* timeout - handle timeouts */ 1496 1497 static void timeout(sig) 1498 int sig; 1499 { 1500 longjmp(timebuf, sig); 1501 } 1502 1503 /* rfc931_name - return remote user name */ 1504 1505 char * 1506 rfc931_name(there, ctrl) 1507 struct sockaddr_in *there; /* remote link information */ 1508 int ctrl; 1509 { 1510 struct sockaddr_in here; /* local link information */ 1511 struct sockaddr_in sin; /* for talking to RFC931 daemon */ 1512 int length; 1513 int s; 1514 unsigned remote; 1515 unsigned local; 1516 static char user[256]; /* XXX */ 1517 char buf[256]; 1518 char *cp; 1519 char *result = "USER_UNKNOWN"; 1520 int len; 1521 1522 /* Find out local port number of our stdin. */ 1523 1524 length = sizeof(here); 1525 if (getsockname(ctrl, (struct sockaddr *) &here, &length) == -1) { 1526 syslog(LOG_ERR, "getsockname: %m"); 1527 return (result); 1528 } 1529 /* Set up timer so we won't get stuck. */ 1530 1531 if ((s = socket(AF_INET, SOCK_STREAM, 0)) == -1) { 1532 syslog(LOG_ERR, "socket: %m"); 1533 return (result); 1534 } 1535 1536 sin = here; 1537 sin.sin_port = htons(0); 1538 if (bind(s, (struct sockaddr *) &sin, sizeof(sin)) == -1) { 1539 syslog(LOG_ERR, "bind: %m"); 1540 return (result); 1541 } 1542 1543 signal(SIGALRM, timeout); 1544 if (setjmp(timebuf)) { 1545 close(s); /* not: fclose(fp) */ 1546 return (result); 1547 } 1548 alarm(TIMEOUT); 1549 1550 /* Connect to the RFC931 daemon. */ 1551 1552 sin = *there; 1553 sin.sin_port = htons(RFC931_PORT); 1554 if (connect(s, (struct sockaddr *) &sin, sizeof(sin)) == -1) { 1555 close(s); 1556 alarm(0); 1557 return (result); 1558 } 1559 1560 /* Query the RFC 931 server. Would 13-byte writes ever be broken up? */ 1561 sprintf(buf, "%u,%u\r\n", ntohs(there->sin_port), ntohs(here.sin_port)); 1562 1563 1564 for (len = 0, cp = buf; len < strlen(buf); ) { 1565 int n; 1566 if ((n = write(s, cp, strlen(buf) - len)) == -1) { 1567 close(s); 1568 alarm(0); 1569 return (result); 1570 } 1571 cp += n; 1572 len += n; 1573 } 1574 1575 /* Read response */ 1576 for (cp = buf; cp < buf + sizeof(buf) - 1; ) { 1577 char c; 1578 if (read(s, &c, 1) != 1) { 1579 close(s); 1580 alarm(0); 1581 return (result); 1582 } 1583 if (c == '\n') 1584 break; 1585 *cp++ = c; 1586 } 1587 *cp = '\0'; 1588 1589 if (sscanf(buf, "%u , %u : USERID :%*[^:]:%255s", &remote, &local, user) == 3 1590 && ntohs(there->sin_port) == remote 1591 && ntohs(here.sin_port) == local) { 1592 1593 /* Strip trailing carriage return. */ 1594 if (cp = strchr(user, '\r')) 1595 *cp = 0; 1596 result = user; 1597 } 1598 1599 alarm(0); 1600 close(s); 1601 return (result); 1602 } 1603 #endif 1604