inetd.c revision 1.19
1 /* $NetBSD: inetd.c,v 1.19 1997/03/04 06:12:44 mikel 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[] = "$NetBSD: inetd.c,v 1.19 1997/03/04 06:12:44 mikel 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 * For non-RPC services, the "service name" can be of the form 89 * hostaddress:servicename, in which case the hostaddress is used 90 * as the host portion of the address to listen on. If hostaddress 91 * consists of a single `*' character, INADDR_ANY is used. 92 * 93 * A line can also consist of just 94 * hostaddress: 95 * where hostaddress is as in the preceding paragraph. Such a line must 96 * have no further fields; the specified hostaddress is remembered and 97 * used for all further lines that have no hostaddress specified, 98 * until the next such line (or EOF). (This is why * is provided to 99 * allow explicit specification of INADDR_ANY.) A line 100 * *: 101 * is implicitly in effect at the beginning of the file. 102 * 103 * The hostaddress specifier may (and often will) contain dots; 104 * the service name must not. 105 * 106 * For RPC services, host-address specifiers are accepted and will 107 * work to some extent; however, because of limitations in the 108 * portmapper interface, it will not work to try to give more than 109 * one line for any given RPC service, even if the host-address 110 * specifiers are different. 111 * 112 * Comment lines are indicated by a `#' in column 1. 113 */ 114 115 /* 116 * Here's the scoop concerning the user.group feature: 117 * 118 * 1) set-group-option off. 119 * 120 * a) user = root: NO setuid() or setgid() is done 121 * 122 * b) other: setuid() 123 * setgid(primary group as found in passwd) 124 * initgroups(name, primary group) 125 * 126 * 2) set-group-option on. 127 * 128 * a) user = root: NO setuid() 129 * setgid(specified group) 130 * NO initgroups() 131 * 132 * b) other: setuid() 133 * setgid(specified group) 134 * initgroups(name, specified group) 135 * 136 */ 137 138 #include <sys/param.h> 139 #include <sys/stat.h> 140 #include <sys/ioctl.h> 141 #include <sys/socket.h> 142 #include <sys/un.h> 143 #include <sys/file.h> 144 #include <sys/wait.h> 145 #include <sys/time.h> 146 #include <sys/resource.h> 147 148 #ifndef RLIMIT_NOFILE 149 #define RLIMIT_NOFILE RLIMIT_OFILE 150 #endif 151 152 #define RPC 153 154 #include <netinet/in.h> 155 #include <arpa/inet.h> 156 157 #include <errno.h> 158 #include <signal.h> 159 #include <netdb.h> 160 #include <syslog.h> 161 #include <pwd.h> 162 #include <grp.h> 163 #include <stdio.h> 164 #include <stdlib.h> 165 #include <string.h> 166 #ifdef RPC 167 #include <rpc/rpc.h> 168 #endif 169 #include "pathnames.h" 170 171 #ifdef LIBWRAP 172 # include <tcpd.h> 173 #ifndef LIBWRAP_ALLOW_FACILITY 174 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH 175 #endif 176 #ifndef LIBWRAP_ALLOW_SEVERITY 177 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO 178 #endif 179 #ifndef LIBWRAP_DENY_FACILITY 180 # define LIBWRAP_DENY_FACILITY LOG_AUTH 181 #endif 182 #ifndef LIBWRAP_DENY_SEVERITY 183 # define LIBWRAP_DENY_SEVERITY LOG_WARNING 184 #endif 185 int allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY; 186 int deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY; 187 #endif 188 189 #define TOOMANY 40 /* don't start more than TOOMANY */ 190 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */ 191 #define RETRYTIME (60*10) /* retry after bind or server fail */ 192 193 #define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM)) 194 195 extern int errno; 196 197 /* Why aren't these static? */ 198 void config(), reapchild(), retry(), goaway(); 199 char *newstr(); 200 201 /* Why isn't this done with <strings.h>? */ 202 char *index(); 203 204 int debug; 205 #ifdef LIBWRAP 206 int lflag; 207 #endif 208 int nsock, maxsock; 209 fd_set allsock; 210 int options; 211 int timingout; 212 struct servent *sp; 213 char *curdom; 214 215 #ifndef OPEN_MAX 216 #define OPEN_MAX 64 217 #endif 218 219 /* Reserve some descriptors, 3 stdio + at least: 1 log, 1 conf. file */ 220 #define FD_MARGIN (8) 221 typeof(((struct rlimit *)0)->rlim_cur) rlim_ofile_cur = OPEN_MAX; 222 223 #ifdef RLIMIT_NOFILE 224 struct rlimit rlim_ofile; 225 #endif 226 227 struct servtab { 228 char *se_hostaddr; /* host address to listen on */ 229 char *se_service; /* name of service */ 230 int se_socktype; /* type of socket to use */ 231 int se_family; /* address family */ 232 char *se_proto; /* protocol used */ 233 int se_rpcprog; /* rpc program number */ 234 int se_rpcversl; /* rpc program lowest version */ 235 int se_rpcversh; /* rpc program highest version */ 236 #define isrpcservice(sep) ((sep)->se_rpcversl != 0) 237 short se_wait; /* single threaded server */ 238 short se_checked; /* looked at during merge */ 239 char *se_user; /* user name to run as */ 240 char *se_group; /* group name to run as */ 241 struct biltin *se_bi; /* if built-in, description */ 242 char *se_server; /* server program */ 243 #define MAXARGV 20 244 char *se_argv[MAXARGV+1]; /* program arguments */ 245 int se_fd; /* open descriptor */ 246 union { 247 struct sockaddr se_un_ctrladdr; 248 struct sockaddr_in se_un_ctrladdr_in; 249 struct sockaddr_un se_un_ctrladdr_un; 250 } se_un; /* bound address */ 251 #define se_ctrladdr se_un.se_un_ctrladdr 252 #define se_ctrladdr_in se_un.se_un_ctrladdr_in 253 #define se_ctrladdr_un se_un.se_un_ctrladdr_un 254 int se_ctrladdr_size; 255 int se_max; /* max # of instances of this service */ 256 int se_count; /* number started since se_time */ 257 struct timeval se_time; /* start of se_count */ 258 #ifdef MULOG 259 int se_log; 260 #define MULOG_RFC931 0x40000000 261 #endif 262 struct servtab *se_next; 263 } *servtab; 264 265 int echo_stream(), discard_stream(), machtime_stream(); 266 int daytime_stream(), chargen_stream(); 267 int echo_dg(), discard_dg(), machtime_dg(), daytime_dg(), chargen_dg(); 268 269 struct biltin { 270 char *bi_service; /* internally provided service name */ 271 int bi_socktype; /* type of socket supported */ 272 short bi_fork; /* 1 if should fork before call */ 273 short bi_wait; /* 1 if should wait for child */ 274 int (*bi_fn)(); /* function which performs it */ 275 } biltins[] = { 276 /* Echo received data */ 277 "echo", SOCK_STREAM, 1, 0, echo_stream, 278 "echo", SOCK_DGRAM, 0, 0, echo_dg, 279 280 /* Internet /dev/null */ 281 "discard", SOCK_STREAM, 1, 0, discard_stream, 282 "discard", SOCK_DGRAM, 0, 0, discard_dg, 283 284 /* Return 32 bit time since 1900 */ 285 "time", SOCK_STREAM, 0, 0, machtime_stream, 286 "time", SOCK_DGRAM, 0, 0, machtime_dg, 287 288 /* Return human-readable time */ 289 "daytime", SOCK_STREAM, 0, 0, daytime_stream, 290 "daytime", SOCK_DGRAM, 0, 0, daytime_dg, 291 292 /* Familiar character generator */ 293 "chargen", SOCK_STREAM, 1, 0, chargen_stream, 294 "chargen", SOCK_DGRAM, 0, 0, chargen_dg, 295 0 296 }; 297 298 #define NUMINT (sizeof(intab) / sizeof(struct inent)) 299 char *CONFIG = _PATH_INETDCONF; 300 char **Argv; 301 char *LastArg; 302 char *progname; 303 304 #ifdef sun 305 /* 306 * Sun's RPC library caches the result of `dtablesize()' 307 * This is incompatible with our "bumping" of file descriptors "on demand" 308 */ 309 int 310 _rpc_dtablesize() 311 { 312 return rlim_ofile_cur; 313 } 314 #endif 315 316 main(argc, argv, envp) 317 int argc; 318 char *argv[], *envp[]; 319 { 320 extern char *optarg; 321 extern int optind; 322 register struct servtab *sep; 323 register struct passwd *pwd; 324 register struct group *grp; 325 register int tmpint; 326 struct sigvec sv; 327 int ch, pid, dofork; 328 char buf[50]; 329 #ifdef LIBWRAP 330 struct request_info req; 331 char *service; 332 #endif 333 334 Argv = argv; 335 if (envp == 0 || *envp == 0) 336 envp = argv; 337 while (*envp) 338 envp++; 339 LastArg = envp[-1] + strlen(envp[-1]); 340 341 progname = strrchr(argv[0], '/'); 342 progname = progname ? progname + 1 : argv[0]; 343 344 while ((ch = getopt(argc, argv, 345 #ifdef LIBWRAP 346 "dl" 347 #else 348 "d" 349 #endif 350 )) != EOF) 351 switch(ch) { 352 case 'd': 353 debug = 1; 354 options |= SO_DEBUG; 355 break; 356 #ifdef LIBWRAP 357 case 'l': 358 lflag = 1; 359 break; 360 #endif 361 case '?': 362 default: 363 #ifdef LIBWRAP 364 fprintf(stderr, "usage: %s [-dl] [conf]\n", progname); 365 #else 366 fprintf(stderr, "usage: %s [-d] [conf]\n", progname); 367 #endif 368 exit(1); 369 } 370 argc -= optind; 371 argv += optind; 372 373 if (argc > 0) 374 CONFIG = argv[0]; 375 376 if (debug == 0) 377 daemon(0, 0); 378 openlog(progname, LOG_PID | LOG_NOWAIT, LOG_DAEMON); 379 logpid(); 380 381 #ifdef RLIMIT_NOFILE 382 if (getrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) { 383 syslog(LOG_ERR, "getrlimit: %m"); 384 } else { 385 rlim_ofile_cur = rlim_ofile.rlim_cur; 386 if (rlim_ofile_cur == RLIM_INFINITY) /* ! */ 387 rlim_ofile_cur = OPEN_MAX; 388 } 389 #endif 390 391 bzero((char *)&sv, sizeof(sv)); 392 sv.sv_mask = SIGBLOCK; 393 sv.sv_handler = retry; 394 sigvec(SIGALRM, &sv, (struct sigvec *)0); 395 config(); 396 sv.sv_handler = config; 397 sigvec(SIGHUP, &sv, (struct sigvec *)0); 398 sv.sv_handler = reapchild; 399 sigvec(SIGCHLD, &sv, (struct sigvec *)0); 400 sv.sv_handler = goaway; 401 sigvec(SIGTERM, &sv, (struct sigvec *)0); 402 sv.sv_handler = goaway; 403 sigvec(SIGINT, &sv, (struct sigvec *)0); 404 405 { 406 /* space for daemons to overwrite environment for ps */ 407 #define DUMMYSIZE 100 408 char dummy[DUMMYSIZE]; 409 410 (void)memset(dummy, 'x', DUMMYSIZE - 1); 411 dummy[DUMMYSIZE - 1] = '\0'; 412 413 (void)setenv("inetd_dummy", dummy, 1); 414 } 415 416 for (;;) { 417 int n, ctrl; 418 fd_set readable; 419 420 if (nsock == 0) { 421 (void) sigblock(SIGBLOCK); 422 while (nsock == 0) 423 sigpause(0L); 424 (void) sigsetmask(0L); 425 } 426 readable = allsock; 427 if ((n = select(maxsock + 1, &readable, (fd_set *)0, 428 (fd_set *)0, (struct timeval *)0)) <= 0) { 429 if (n < 0 && errno != EINTR) 430 syslog(LOG_WARNING, "select: %m\n"); 431 sleep(1); 432 continue; 433 } 434 for (sep = servtab; n && sep; sep = sep->se_next) 435 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) { 436 n--; 437 if (debug) 438 fprintf(stderr, "someone wants %s\n", sep->se_service); 439 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 440 /* XXX here do the libwrap check-before-accept */ 441 ctrl = accept(sep->se_fd, (struct sockaddr *)0, 442 (int *)0); 443 if (debug) 444 fprintf(stderr, "accept, ctrl %d\n", ctrl); 445 if (ctrl < 0) { 446 if (errno == EINTR) 447 continue; 448 syslog(LOG_WARNING, "accept (for %s): %m", 449 sep->se_service); 450 continue; 451 } 452 #ifdef LIBWRAP 453 request_init(&req, RQ_DAEMON, sep->se_argv[0] ? sep->se_argv[0] : 454 sep->se_service, RQ_FILE, ctrl, NULL); 455 fromhost(&req); 456 if (!hosts_access(&req)) { 457 sp = getservbyport(sep->se_ctrladdr_in.sin_port, sep->se_proto); 458 if (sp == NULL) { 459 (void)snprintf(buf, sizeof buf, "%d", 460 ntohs(sep->se_ctrladdr_in.sin_port)); 461 service = buf; 462 } else 463 service = sp->s_name; 464 syslog(deny_severity, 465 "refused connection from %.500s, service %s (%s)", 466 eval_client(&req), service, sep->se_proto); 467 shutdown(ctrl, 2); 468 close(ctrl); 469 continue; 470 } 471 if (lflag) { 472 sp = getservbyport(sep->se_ctrladdr_in.sin_port, sep->se_proto); 473 if (sp == NULL) { 474 (void)snprintf(buf, sizeof buf, "%d", 475 ntohs(sep->se_ctrladdr_in.sin_port)); 476 service = buf; 477 } else 478 service = sp->s_name; 479 syslog(allow_severity,"connection from %.500s, service %s (%s)", 480 eval_client(&req), service, sep->se_proto); 481 } 482 #endif /* LIBWRAP */ 483 } else 484 ctrl = sep->se_fd; 485 (void) sigblock(SIGBLOCK); 486 pid = 0; 487 dofork = (sep->se_bi == 0 || sep->se_bi->bi_fork); 488 if (dofork) { 489 if (sep->se_count++ == 0) 490 (void)gettimeofday(&sep->se_time, 491 (struct timezone *)0); 492 else if (sep->se_count >= sep->se_max) { 493 struct timeval now; 494 495 (void)gettimeofday(&now, (struct timezone *)0); 496 if (now.tv_sec - sep->se_time.tv_sec > 497 CNT_INTVL) { 498 sep->se_time = now; 499 sep->se_count = 1; 500 } else { 501 syslog(LOG_ERR, 502 "%s/%s server failing (looping), service terminated\n", 503 sep->se_service, sep->se_proto); 504 FD_CLR(sep->se_fd, &allsock); 505 (void) close(sep->se_fd); 506 sep->se_fd = -1; 507 sep->se_count = 0; 508 nsock--; 509 sigsetmask(0L); 510 if (!timingout) { 511 timingout = 1; 512 alarm(RETRYTIME); 513 } 514 continue; 515 } 516 } 517 pid = fork(); 518 } 519 if (pid < 0) { 520 syslog(LOG_ERR, "fork: %m"); 521 if (sep->se_socktype == SOCK_STREAM) 522 close(ctrl); 523 sigsetmask(0L); 524 sleep(1); 525 continue; 526 } 527 if (pid && sep->se_wait) { 528 sep->se_wait = pid; 529 FD_CLR(sep->se_fd, &allsock); 530 nsock--; 531 } 532 sigsetmask(0L); 533 if (pid == 0) { 534 if (debug && dofork) 535 setsid(); 536 if (sep->se_bi) 537 (*sep->se_bi->bi_fn)(ctrl, sep); 538 else { 539 if ((pwd = getpwnam(sep->se_user)) == NULL) { 540 syslog(LOG_ERR, 541 "getpwnam: %s: No such user", 542 sep->se_user); 543 if (sep->se_socktype != SOCK_STREAM) 544 recv(0, buf, sizeof (buf), 0); 545 _exit(1); 546 } 547 if (sep->se_group && 548 (grp = getgrnam(sep->se_group)) == NULL) { 549 syslog(LOG_ERR, 550 "getgrnam: %s: No such group", 551 sep->se_group); 552 if (sep->se_socktype != SOCK_STREAM) 553 recv(0, buf, sizeof (buf), 0); 554 _exit(1); 555 } 556 if (pwd->pw_uid) { 557 if (sep->se_group) 558 pwd->pw_gid = grp->gr_gid; 559 (void) setgid((gid_t)pwd->pw_gid); 560 initgroups(pwd->pw_name, pwd->pw_gid); 561 (void) setuid((uid_t)pwd->pw_uid); 562 } else if (sep->se_group) { 563 (void) setgid((gid_t)grp->gr_gid); 564 } 565 if (debug) 566 fprintf(stderr, "%d execl %s\n", 567 getpid(), sep->se_server); 568 #ifdef MULOG 569 if (sep->se_log) 570 dolog(sep, ctrl); 571 #endif 572 dup2(ctrl, 0); 573 close(ctrl); 574 dup2(0, 1); 575 dup2(0, 2); 576 #ifdef RLIMIT_NOFILE 577 if (rlim_ofile.rlim_cur != rlim_ofile_cur) { 578 if (setrlimit(RLIMIT_NOFILE, 579 &rlim_ofile) < 0) 580 syslog(LOG_ERR,"setrlimit: %m"); 581 } 582 #endif 583 for (tmpint = rlim_ofile_cur-1; --tmpint > 2; ) 584 (void)close(tmpint); 585 execv(sep->se_server, sep->se_argv); 586 if (sep->se_socktype != SOCK_STREAM) 587 recv(0, buf, sizeof (buf), 0); 588 syslog(LOG_ERR, "execv %s: %m", sep->se_server); 589 _exit(1); 590 } 591 } 592 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 593 close(ctrl); 594 } 595 } 596 } 597 598 void 599 reapchild() 600 { 601 int status; 602 int pid; 603 register struct servtab *sep; 604 605 for (;;) { 606 pid = wait3(&status, WNOHANG, (struct rusage *)0); 607 if (pid <= 0) 608 break; 609 if (debug) 610 fprintf(stderr, "%d reaped\n", pid); 611 for (sep = servtab; sep; sep = sep->se_next) 612 if (sep->se_wait == pid) { 613 if (WIFEXITED(status) && WEXITSTATUS(status)) 614 syslog(LOG_WARNING, 615 "%s: exit status 0x%x", 616 sep->se_server, WEXITSTATUS(status)); 617 else if (WIFSIGNALED(status)) 618 syslog(LOG_WARNING, 619 "%s: exit signal 0x%x", 620 sep->se_server, WTERMSIG(status)); 621 sep->se_wait = 1; 622 FD_SET(sep->se_fd, &allsock); 623 nsock++; 624 if (debug) 625 fprintf(stderr, "restored %s, fd %d\n", 626 sep->se_service, sep->se_fd); 627 } 628 } 629 } 630 631 void 632 config() 633 { 634 register struct servtab *sep, *cp, **sepp; 635 struct servtab *getconfigent(), *enter(); 636 long omask; 637 int n; 638 639 if (!setconfig()) { 640 syslog(LOG_ERR, "%s: %m", CONFIG); 641 return; 642 } 643 for (sep = servtab; sep; sep = sep->se_next) 644 sep->se_checked = 0; 645 while (cp = getconfigent()) { 646 for (sep = servtab; sep; sep = sep->se_next) 647 if (strcmp(sep->se_service, cp->se_service) == 0 && 648 strcmp(sep->se_hostaddr, cp->se_hostaddr) == 0 && 649 strcmp(sep->se_proto, cp->se_proto) == 0) 650 break; 651 if (sep != 0) { 652 int i; 653 654 #define SWAP(type, a, b) {type c=(type)a; (type)a=(type)b; (type)b=(type)c;} 655 656 omask = sigblock(SIGBLOCK); 657 /* 658 * sep->se_wait may be holding the pid of a daemon 659 * that we're waiting for. If so, don't overwrite 660 * it unless the config file explicitly says don't 661 * wait. 662 */ 663 if (cp->se_bi == 0 && 664 (sep->se_wait == 1 || cp->se_wait == 0)) 665 sep->se_wait = cp->se_wait; 666 SWAP(int, cp->se_max, sep->se_max); 667 SWAP(char *, sep->se_user, cp->se_user); 668 SWAP(char *, sep->se_group, cp->se_group); 669 SWAP(char *, sep->se_server, cp->se_server); 670 for (i = 0; i < MAXARGV; i++) 671 SWAP(char *, sep->se_argv[i], cp->se_argv[i]); 672 #undef SWAP 673 if (isrpcservice(sep)) 674 unregister_rpc(sep); 675 sep->se_rpcversl = cp->se_rpcversl; 676 sep->se_rpcversh = cp->se_rpcversh; 677 sigsetmask(omask); 678 freeconfig(cp); 679 if (debug) 680 print_service("REDO", sep); 681 } else { 682 sep = enter(cp); 683 if (debug) 684 print_service("ADD ", sep); 685 } 686 sep->se_checked = 1; 687 688 switch (sep->se_family) { 689 case AF_UNIX: 690 if (sep->se_fd != -1) 691 break; 692 (void)unlink(sep->se_service); 693 n = strlen(sep->se_service); 694 if (n > sizeof sep->se_ctrladdr_un.sun_path - 1) 695 n = sizeof sep->se_ctrladdr_un.sun_path - 1; 696 strncpy(sep->se_ctrladdr_un.sun_path, 697 sep->se_service, n); 698 sep->se_ctrladdr_un.sun_family = AF_UNIX; 699 sep->se_ctrladdr_size = n + 700 sizeof sep->se_ctrladdr_un - 701 sizeof sep->se_ctrladdr_un.sun_path; 702 setup(sep); 703 break; 704 case AF_INET: 705 sep->se_ctrladdr_in.sin_family = AF_INET; 706 if (!strcmp(sep->se_hostaddr,"*")) 707 sep->se_ctrladdr_in.sin_addr.s_addr = INADDR_ANY; 708 else if (!inet_aton(sep->se_hostaddr,&sep->se_ctrladdr_in.sin_addr)) { 709 /* Do we really want to support hostname lookups here? */ 710 struct hostent *hp; 711 hp = gethostbyname(sep->se_hostaddr); 712 if (hp == 0) { 713 syslog(LOG_ERR,"%s: unknown host",sep->se_hostaddr); 714 continue; 715 } else if (hp->h_addrtype != AF_INET) { 716 syslog(LOG_ERR,"%s: address isn't an Internet address",sep->se_hostaddr); 717 continue; 718 } else if (hp->h_length != sizeof(struct in_addr)) { 719 syslog(LOG_ERR,"%s: address size wrong (under DNS corruption attack?)",sep->se_hostaddr); 720 continue; 721 } else { 722 bcopy(hp->h_addr_list[0],&sep->se_ctrladdr_in.sin_addr,sizeof(struct in_addr)); 723 } 724 } 725 sep->se_ctrladdr_size = sizeof sep->se_ctrladdr_in; 726 if (isrpcservice(sep)) { 727 struct rpcent *rp; 728 729 sep->se_rpcprog = atoi(sep->se_service); 730 if (sep->se_rpcprog == 0) { 731 rp = getrpcbyname(sep->se_service); 732 if (rp == 0) { 733 syslog(LOG_ERR, 734 "%s: unknown service", 735 sep->se_service); 736 continue; 737 } 738 sep->se_rpcprog = rp->r_number; 739 } 740 if (sep->se_fd == -1) 741 setup(sep); 742 if (sep->se_fd != -1) 743 register_rpc(sep); 744 } else { 745 u_short port = htons(atoi(sep->se_service)); 746 747 if (!port) { 748 sp = getservbyname(sep->se_service, 749 sep->se_proto); 750 if (sp == 0) { 751 syslog(LOG_ERR, 752 "%s/%s: unknown service", 753 sep->se_service, sep->se_proto); 754 continue; 755 } 756 port = sp->s_port; 757 } 758 if (port != sep->se_ctrladdr_in.sin_port) { 759 sep->se_ctrladdr_in.sin_port = port; 760 if (sep->se_fd != -1) { 761 FD_CLR(sep->se_fd, &allsock); 762 nsock--; 763 (void) close(sep->se_fd); 764 } 765 sep->se_fd = -1; 766 } 767 if (sep->se_fd == -1) 768 setup(sep); 769 } 770 } 771 } 772 endconfig(); 773 /* 774 * Purge anything not looked at above. 775 */ 776 omask = sigblock(SIGBLOCK); 777 sepp = &servtab; 778 while (sep = *sepp) { 779 if (sep->se_checked) { 780 sepp = &sep->se_next; 781 continue; 782 } 783 *sepp = sep->se_next; 784 if (sep->se_fd != -1) { 785 FD_CLR(sep->se_fd, &allsock); 786 nsock--; 787 (void) close(sep->se_fd); 788 } 789 if (isrpcservice(sep)) 790 unregister_rpc(sep); 791 if (sep->se_family == AF_UNIX) 792 (void)unlink(sep->se_service); 793 if (debug) 794 print_service("FREE", sep); 795 freeconfig(sep); 796 free((char *)sep); 797 } 798 (void) sigsetmask(omask); 799 } 800 801 void 802 retry() 803 { 804 register struct servtab *sep; 805 806 timingout = 0; 807 for (sep = servtab; sep; sep = sep->se_next) { 808 if (sep->se_fd == -1) { 809 switch (sep->se_family) { 810 case AF_UNIX: 811 case AF_INET: 812 setup(sep); 813 if (sep->se_fd != -1 && isrpcservice(sep)) 814 register_rpc(sep); 815 break; 816 } 817 } 818 } 819 } 820 821 void 822 goaway() 823 { 824 register struct servtab *sep; 825 826 for (sep = servtab; sep; sep = sep->se_next) { 827 if (sep->se_fd == -1) 828 continue; 829 830 switch (sep->se_family) { 831 case AF_UNIX: 832 (void)unlink(sep->se_service); 833 break; 834 case AF_INET: 835 if (sep->se_wait == 1 && isrpcservice(sep)) 836 unregister_rpc(sep); 837 break; 838 } 839 (void)close(sep->se_fd); 840 } 841 (void)unlink(_PATH_INETDPID); 842 exit(0); 843 } 844 845 846 setup(sep) 847 register struct servtab *sep; 848 { 849 int on = 1; 850 851 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) { 852 syslog(LOG_ERR, "%s/%s: socket: %m", 853 sep->se_service, sep->se_proto); 854 return; 855 } 856 #define turnon(fd, opt) \ 857 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 858 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 859 turnon(sep->se_fd, SO_DEBUG) < 0) 860 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 861 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 862 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 863 #undef turnon 864 if (bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size) < 0) { 865 syslog(LOG_ERR, "%s/%s: bind: %m", 866 sep->se_service, sep->se_proto); 867 (void) close(sep->se_fd); 868 sep->se_fd = -1; 869 if (!timingout) { 870 timingout = 1; 871 alarm(RETRYTIME); 872 } 873 return; 874 } 875 if (sep->se_socktype == SOCK_STREAM) 876 listen(sep->se_fd, 10); 877 878 FD_SET(sep->se_fd, &allsock); 879 nsock++; 880 if (sep->se_fd > maxsock) { 881 maxsock = sep->se_fd; 882 if (maxsock > rlim_ofile_cur - FD_MARGIN) 883 bump_nofile(); 884 } 885 } 886 887 register_rpc(sep) 888 register struct servtab *sep; 889 { 890 #ifdef RPC 891 int n; 892 struct sockaddr_in sin; 893 struct protoent *pp; 894 895 if ((pp = getprotobyname(sep->se_proto+4)) == NULL) { 896 syslog(LOG_ERR, "%s: getproto: %m", 897 sep->se_proto); 898 return; 899 } 900 n = sizeof sin; 901 if (getsockname(sep->se_fd, (struct sockaddr *)&sin, &n) < 0) { 902 syslog(LOG_ERR, "%s/%s: getsockname: %m", 903 sep->se_service, sep->se_proto); 904 return; 905 } 906 907 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 908 if (debug) 909 fprintf(stderr, "pmap_set: %u %u %u %u\n", 910 sep->se_rpcprog, n, pp->p_proto, ntohs(sin.sin_port)); 911 (void)pmap_unset(sep->se_rpcprog, n); 912 if (!pmap_set(sep->se_rpcprog, n, pp->p_proto, ntohs(sin.sin_port))) 913 syslog(LOG_ERR, "pmap_set: %u %u %u %u: %m", 914 sep->se_rpcprog, n, pp->p_proto, ntohs(sin.sin_port)); 915 } 916 #endif /* RPC */ 917 } 918 919 unregister_rpc(sep) 920 register struct servtab *sep; 921 { 922 #ifdef RPC 923 int n; 924 925 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 926 if (debug) 927 fprintf(stderr, "pmap_unset(%u, %u)\n", 928 sep->se_rpcprog, n); 929 if (!pmap_unset(sep->se_rpcprog, n)) 930 syslog(LOG_ERR, "pmap_unset(%u, %u)\n", 931 sep->se_rpcprog, n); 932 } 933 #endif /* RPC */ 934 } 935 936 937 struct servtab * 938 enter(cp) 939 struct servtab *cp; 940 { 941 register struct servtab *sep; 942 long omask; 943 944 sep = (struct servtab *)malloc(sizeof (*sep)); 945 if (sep == (struct servtab *)0) { 946 syslog(LOG_ERR, "Out of memory."); 947 exit(-1); 948 } 949 *sep = *cp; 950 sep->se_fd = -1; 951 sep->se_rpcprog = -1; 952 omask = sigblock(SIGBLOCK); 953 sep->se_next = servtab; 954 servtab = sep; 955 sigsetmask(omask); 956 return (sep); 957 } 958 959 FILE *fconfig = NULL; 960 struct servtab serv; 961 char line[256]; 962 char *skip(), *nextline(); 963 char *defhost; 964 965 setconfig() 966 { 967 if (defhost) free(defhost); 968 defhost = newstr("*"); 969 if (fconfig != NULL) { 970 fseek(fconfig, 0L, SEEK_SET); 971 return (1); 972 } 973 fconfig = fopen(CONFIG, "r"); 974 return (fconfig != NULL); 975 } 976 977 endconfig() 978 { 979 if (fconfig) { 980 (void) fclose(fconfig); 981 fconfig = NULL; 982 } 983 if (defhost) { 984 free(defhost); 985 defhost = 0; 986 } 987 } 988 989 struct servtab * 990 getconfigent() 991 { 992 register struct servtab *sep = &serv; 993 int argc; 994 char *cp, *arg; 995 char *hostdelim; 996 997 more: 998 #ifdef MULOG 999 while ((cp = nextline(fconfig)) && *cp == '#') { 1000 /* Avoid use of `skip' if there is a danger of it looking 1001 * at continuation lines. 1002 */ 1003 do { 1004 cp++; 1005 } while (*cp == ' ' || *cp == '\t'); 1006 if (*cp == '\0') 1007 continue; 1008 if ((arg = skip(&cp)) == NULL) 1009 continue; 1010 if (strcmp(arg, "DOMAIN")) 1011 continue; 1012 if (curdom) 1013 free(curdom); 1014 curdom = NULL; 1015 while (*cp == ' ' || *cp == '\t') 1016 cp++; 1017 if (*cp == '\0') 1018 continue; 1019 arg = cp; 1020 while (*cp && *cp != ' ' && *cp != '\t') 1021 cp++; 1022 if (*cp != '\0') 1023 *cp++ = '\0'; 1024 curdom = newstr(arg); 1025 } 1026 #else 1027 while ((cp = nextline(fconfig)) && *cp == '#') 1028 ; 1029 #endif 1030 if (cp == NULL) 1031 return ((struct servtab *)0); 1032 bzero((char *)sep, sizeof *sep); 1033 sep->se_service = newstr(skip(&cp)); 1034 hostdelim = rindex(sep->se_service,':'); 1035 if (hostdelim) { 1036 *hostdelim = '\0'; 1037 sep->se_hostaddr = sep->se_service; 1038 sep->se_service = newstr(hostdelim+1); 1039 } else { 1040 sep->se_hostaddr = newstr(defhost); 1041 } 1042 arg = skip(&cp); 1043 if (arg == NULL) { 1044 if (!strcmp(sep->se_service,"")) { 1045 /* if we didn't have a colon, still OK */ 1046 free(defhost); 1047 defhost = sep->se_hostaddr; 1048 } else 1049 free(sep->se_hostaddr); 1050 free(sep->se_service); 1051 goto more; 1052 } 1053 1054 if (strcmp(arg, "stream") == 0) 1055 sep->se_socktype = SOCK_STREAM; 1056 else if (strcmp(arg, "dgram") == 0) 1057 sep->se_socktype = SOCK_DGRAM; 1058 else if (strcmp(arg, "rdm") == 0) 1059 sep->se_socktype = SOCK_RDM; 1060 else if (strcmp(arg, "seqpacket") == 0) 1061 sep->se_socktype = SOCK_SEQPACKET; 1062 else if (strcmp(arg, "raw") == 0) 1063 sep->se_socktype = SOCK_RAW; 1064 else 1065 sep->se_socktype = -1; 1066 1067 sep->se_proto = newstr(skip(&cp)); 1068 if (strcmp(sep->se_proto, "unix") == 0) { 1069 sep->se_family = AF_UNIX; 1070 } else { 1071 sep->se_family = AF_INET; 1072 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1073 #ifdef RPC 1074 char *cp, *ccp; 1075 cp = index(sep->se_service, '/'); 1076 if (cp == 0) { 1077 syslog(LOG_ERR, "%s: no rpc version", 1078 sep->se_service); 1079 goto more; 1080 } 1081 *cp++ = '\0'; 1082 sep->se_rpcversl = 1083 sep->se_rpcversh = strtol(cp, &ccp, 0); 1084 if (ccp == cp) { 1085 badafterall: 1086 syslog(LOG_ERR, "%s/%s: bad rpc version", 1087 sep->se_service, cp); 1088 goto more; 1089 } 1090 if (*ccp == '-') { 1091 cp = ccp + 1; 1092 sep->se_rpcversh = strtol(cp, &ccp, 0); 1093 if (ccp == cp) 1094 goto badafterall; 1095 } 1096 #else 1097 syslog(LOG_ERR, "%s: rpc services not suported", 1098 sep->se_service); 1099 goto more; 1100 #endif /* RPC */ 1101 } 1102 } 1103 arg = skip(&cp); 1104 if (arg == NULL) 1105 goto more; 1106 { 1107 char *s = index(arg, '.'); 1108 if (s) { 1109 *s++ = '\0'; 1110 sep->se_max = atoi(s); 1111 } else 1112 sep->se_max = TOOMANY; 1113 } 1114 sep->se_wait = strcmp(arg, "wait") == 0; 1115 sep->se_user = newstr(skip(&cp)); 1116 if (sep->se_group = index(sep->se_user, '.')) { 1117 *sep->se_group++ = '\0'; 1118 } 1119 sep->se_server = newstr(skip(&cp)); 1120 if (strcmp(sep->se_server, "internal") == 0) { 1121 register struct biltin *bi; 1122 1123 for (bi = biltins; bi->bi_service; bi++) 1124 if (bi->bi_socktype == sep->se_socktype && 1125 strcmp(bi->bi_service, sep->se_service) == 0) 1126 break; 1127 if (bi->bi_service == 0) { 1128 syslog(LOG_ERR, "internal service %s unknown\n", 1129 sep->se_service); 1130 goto more; 1131 } 1132 sep->se_bi = bi; 1133 sep->se_wait = bi->bi_wait; 1134 } else 1135 sep->se_bi = NULL; 1136 argc = 0; 1137 for (arg = skip(&cp); cp; arg = skip(&cp)) { 1138 #if MULOG 1139 char *colon, *rindex(); 1140 1141 if (argc == 0 && (colon = rindex(arg, ':'))) { 1142 while (arg < colon) { 1143 int x; 1144 char *ccp; 1145 1146 switch (*arg++) { 1147 case 'l': 1148 x = 1; 1149 if (isdigit(*arg)) { 1150 x = strtol(arg, &ccp, 0); 1151 if (ccp == arg) 1152 break; 1153 arg = ccp; 1154 } 1155 sep->se_log &= ~MULOG_RFC931; 1156 sep->se_log |= x; 1157 break; 1158 case 'a': 1159 sep->se_log |= MULOG_RFC931; 1160 break; 1161 default: 1162 break; 1163 } 1164 } 1165 arg = colon + 1; 1166 } 1167 #endif 1168 if (argc < MAXARGV) 1169 sep->se_argv[argc++] = newstr(arg); 1170 } 1171 while (argc <= MAXARGV) 1172 sep->se_argv[argc++] = NULL; 1173 return (sep); 1174 } 1175 1176 freeconfig(cp) 1177 register struct servtab *cp; 1178 { 1179 int i; 1180 1181 if (cp->se_hostaddr) 1182 free(cp->se_hostaddr); 1183 if (cp->se_service) 1184 free(cp->se_service); 1185 if (cp->se_proto) 1186 free(cp->se_proto); 1187 if (cp->se_user) 1188 free(cp->se_user); 1189 /* Note: se_group is part of the newstr'ed se_user */ 1190 if (cp->se_server) 1191 free(cp->se_server); 1192 for (i = 0; i < MAXARGV; i++) 1193 if (cp->se_argv[i]) 1194 free(cp->se_argv[i]); 1195 } 1196 1197 char * 1198 skip(cpp) 1199 char **cpp; 1200 { 1201 register char *cp = *cpp; 1202 char *start; 1203 1204 if (*cpp == NULL) 1205 return ((char *)0); 1206 1207 again: 1208 while (*cp == ' ' || *cp == '\t') 1209 cp++; 1210 if (*cp == '\0') { 1211 int c; 1212 1213 c = getc(fconfig); 1214 (void) ungetc(c, fconfig); 1215 if (c == ' ' || c == '\t') 1216 if (cp = nextline(fconfig)) 1217 goto again; 1218 *cpp = (char *)0; 1219 return ((char *)0); 1220 } 1221 start = cp; 1222 while (*cp && *cp != ' ' && *cp != '\t') 1223 cp++; 1224 if (*cp != '\0') 1225 *cp++ = '\0'; 1226 *cpp = cp; 1227 return (start); 1228 } 1229 1230 char * 1231 nextline(fd) 1232 FILE *fd; 1233 { 1234 char *cp; 1235 1236 if (fgets(line, sizeof (line), fd) == NULL) 1237 return ((char *)0); 1238 cp = index(line, '\n'); 1239 if (cp) 1240 *cp = '\0'; 1241 return (line); 1242 } 1243 1244 char * 1245 newstr(cp) 1246 char *cp; 1247 { 1248 if (cp = strdup(cp ? cp : "")) 1249 return(cp); 1250 syslog(LOG_ERR, "strdup: %m"); 1251 exit(-1); 1252 } 1253 1254 inetd_setproctitle(a, s) 1255 char *a; 1256 int s; 1257 { 1258 int size; 1259 register char *cp; 1260 struct sockaddr_in sin; 1261 char buf[80]; 1262 1263 cp = Argv[0]; 1264 size = sizeof(sin); 1265 if (getpeername(s, (struct sockaddr *)&sin, &size) == 0) 1266 (void)snprintf(buf, sizeof buf, "-%s [%s]", a, 1267 inet_ntoa(sin.sin_addr)); 1268 else 1269 (void)snprintf(buf, sizeof buf, "-%s", a); 1270 strncpy(cp, buf, LastArg - cp); 1271 cp += strlen(cp); 1272 while (cp < LastArg) 1273 *cp++ = ' '; 1274 } 1275 1276 logpid() 1277 { 1278 FILE *fp; 1279 1280 if ((fp = fopen(_PATH_INETDPID, "w")) != NULL) { 1281 fprintf(fp, "%u\n", getpid()); 1282 (void)fclose(fp); 1283 } 1284 } 1285 1286 bump_nofile() 1287 { 1288 #ifdef RLIMIT_NOFILE 1289 1290 #define FD_CHUNK 32 1291 1292 struct rlimit rl; 1293 1294 if (getrlimit(RLIMIT_NOFILE, &rl) < 0) { 1295 syslog(LOG_ERR, "getrlimit: %m"); 1296 return -1; 1297 } 1298 rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK); 1299 if (rl.rlim_cur <= rlim_ofile_cur) { 1300 syslog(LOG_ERR, 1301 "bump_nofile: cannot extend file limit, max = %d", 1302 rl.rlim_cur); 1303 return -1; 1304 } 1305 1306 if (setrlimit(RLIMIT_NOFILE, &rl) < 0) { 1307 syslog(LOG_ERR, "setrlimit: %m"); 1308 return -1; 1309 } 1310 1311 rlim_ofile_cur = rl.rlim_cur; 1312 return 0; 1313 1314 #else 1315 syslog(LOG_ERR, "bump_nofile: cannot extend file limit"); 1316 return -1; 1317 #endif 1318 } 1319 1320 /* 1321 * Internet services provided internally by inetd: 1322 */ 1323 #define BUFSIZE 4096 1324 1325 /* ARGSUSED */ 1326 echo_stream(s, sep) /* Echo service -- echo data back */ 1327 int s; 1328 struct servtab *sep; 1329 { 1330 char buffer[BUFSIZE]; 1331 int i; 1332 1333 inetd_setproctitle(sep->se_service, s); 1334 while ((i = read(s, buffer, sizeof(buffer))) > 0 && 1335 write(s, buffer, i) > 0) 1336 ; 1337 exit(0); 1338 } 1339 1340 /* ARGSUSED */ 1341 echo_dg(s, sep) /* Echo service -- echo data back */ 1342 int s; 1343 struct servtab *sep; 1344 { 1345 char buffer[BUFSIZE]; 1346 int i, size; 1347 struct sockaddr sa; 1348 1349 size = sizeof(sa); 1350 if ((i = recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size)) < 0) 1351 return; 1352 (void) sendto(s, buffer, i, 0, &sa, sizeof(sa)); 1353 } 1354 1355 /* ARGSUSED */ 1356 discard_stream(s, sep) /* Discard service -- ignore data */ 1357 int s; 1358 struct servtab *sep; 1359 { 1360 char buffer[BUFSIZE]; 1361 1362 inetd_setproctitle(sep->se_service, s); 1363 while ((errno = 0, read(s, buffer, sizeof(buffer)) > 0) || 1364 errno == EINTR) 1365 ; 1366 exit(0); 1367 } 1368 1369 /* ARGSUSED */ 1370 discard_dg(s, sep) /* Discard service -- ignore data */ 1371 int s; 1372 struct servtab *sep; 1373 { 1374 char buffer[BUFSIZE]; 1375 1376 (void) read(s, buffer, sizeof(buffer)); 1377 } 1378 1379 #include <ctype.h> 1380 #define LINESIZ 72 1381 char ring[128]; 1382 char *endring; 1383 1384 initring() 1385 { 1386 register int i; 1387 1388 endring = ring; 1389 1390 for (i = 0; i <= 128; ++i) 1391 if (isprint(i)) 1392 *endring++ = i; 1393 } 1394 1395 /* ARGSUSED */ 1396 chargen_stream(s, sep) /* Character generator */ 1397 int s; 1398 struct servtab *sep; 1399 { 1400 register char *rs; 1401 int len; 1402 char text[LINESIZ+2]; 1403 1404 inetd_setproctitle(sep->se_service, s); 1405 1406 if (!endring) { 1407 initring(); 1408 rs = ring; 1409 } 1410 1411 text[LINESIZ] = '\r'; 1412 text[LINESIZ + 1] = '\n'; 1413 for (rs = ring;;) { 1414 if ((len = endring - rs) >= LINESIZ) 1415 bcopy(rs, text, LINESIZ); 1416 else { 1417 bcopy(rs, text, len); 1418 bcopy(ring, text + len, LINESIZ - len); 1419 } 1420 if (++rs == endring) 1421 rs = ring; 1422 if (write(s, text, sizeof(text)) != sizeof(text)) 1423 break; 1424 } 1425 exit(0); 1426 } 1427 1428 /* ARGSUSED */ 1429 chargen_dg(s, sep) /* Character generator */ 1430 int s; 1431 struct servtab *sep; 1432 { 1433 struct sockaddr sa; 1434 static char *rs; 1435 int len, size; 1436 char text[LINESIZ+2]; 1437 1438 if (endring == 0) { 1439 initring(); 1440 rs = ring; 1441 } 1442 1443 size = sizeof(sa); 1444 if (recvfrom(s, text, sizeof(text), 0, &sa, &size) < 0) 1445 return; 1446 1447 if ((len = endring - rs) >= LINESIZ) 1448 bcopy(rs, text, LINESIZ); 1449 else { 1450 bcopy(rs, text, len); 1451 bcopy(ring, text + len, LINESIZ - len); 1452 } 1453 if (++rs == endring) 1454 rs = ring; 1455 text[LINESIZ] = '\r'; 1456 text[LINESIZ + 1] = '\n'; 1457 (void) sendto(s, text, sizeof(text), 0, &sa, sizeof(sa)); 1458 } 1459 1460 /* 1461 * Return a machine readable date and time, in the form of the 1462 * number of seconds since midnight, Jan 1, 1900. Since gettimeofday 1463 * returns the number of seconds since midnight, Jan 1, 1970, 1464 * we must add 2208988800 seconds to this figure to make up for 1465 * some seventy years Bell Labs was asleep. 1466 */ 1467 1468 long 1469 machtime() 1470 { 1471 struct timeval tv; 1472 1473 if (gettimeofday(&tv, (struct timezone *)0) < 0) { 1474 fprintf(stderr, "Unable to get time of day\n"); 1475 return (0L); 1476 } 1477 return (htonl((long)tv.tv_sec + 2208988800UL)); 1478 } 1479 1480 /* ARGSUSED */ 1481 machtime_stream(s, sep) 1482 int s; 1483 struct servtab *sep; 1484 { 1485 long result; 1486 1487 result = machtime(); 1488 (void) write(s, (char *) &result, sizeof(result)); 1489 } 1490 1491 /* ARGSUSED */ 1492 machtime_dg(s, sep) 1493 int s; 1494 struct servtab *sep; 1495 { 1496 long result; 1497 struct sockaddr sa; 1498 int size; 1499 1500 size = sizeof(sa); 1501 if (recvfrom(s, (char *)&result, sizeof(result), 0, &sa, &size) < 0) 1502 return; 1503 result = machtime(); 1504 (void) sendto(s, (char *) &result, sizeof(result), 0, &sa, sizeof(sa)); 1505 } 1506 1507 /* ARGSUSED */ 1508 daytime_stream(s, sep) /* Return human-readable time of day */ 1509 int s; 1510 struct servtab *sep; 1511 { 1512 char buffer[256]; 1513 time_t time(), clock; 1514 int len; 1515 1516 clock = time((time_t *) 0); 1517 1518 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 1519 (void) write(s, buffer, len); 1520 } 1521 1522 /* ARGSUSED */ 1523 daytime_dg(s, sep) /* Return human-readable time of day */ 1524 int s; 1525 struct servtab *sep; 1526 { 1527 char buffer[256]; 1528 time_t time(), clock; 1529 struct sockaddr sa; 1530 int size; 1531 1532 clock = time((time_t *) 0); 1533 1534 size = sizeof(sa); 1535 if (recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size) < 0) 1536 return; 1537 size = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 1538 (void) sendto(s, buffer, size, 0, &sa, sizeof(sa)); 1539 } 1540 1541 /* 1542 * print_service: 1543 * Dump relevant information to stderr 1544 */ 1545 print_service(action, sep) 1546 char *action; 1547 struct servtab *sep; 1548 { 1549 if (isrpcservice(sep)) 1550 fprintf(stderr, 1551 "%s: %s rpcprog=%d, rpcvers = %d/%d, proto=%s, wait.max=%d.%d, user.group=%s.%s builtin=%lx server=%s\n", 1552 action, sep->se_service, 1553 sep->se_rpcprog, sep->se_rpcversh, sep->se_rpcversl, sep->se_proto, 1554 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 1555 (long)sep->se_bi, sep->se_server); 1556 else 1557 fprintf(stderr, 1558 "%s: %s proto=%s, wait.max=%d.%d, user.group=%s.%s builtin=%lx server=%s\n", 1559 action, sep->se_service, sep->se_proto, 1560 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 1561 (long)sep->se_bi, sep->se_server); 1562 } 1563 1564 #ifdef MULOG 1565 dolog(sep, ctrl) 1566 struct servtab *sep; 1567 int ctrl; 1568 { 1569 struct sockaddr sa; 1570 struct sockaddr_in *sin = (struct sockaddr_in *)&sa; 1571 int len = sizeof(sa); 1572 struct hostent *hp; 1573 char *host, *dp, buf[BUFSIZ], *rfc931_name(); 1574 int connected = 1; 1575 1576 if (sep->se_family != AF_INET) 1577 return; 1578 1579 if (getpeername(ctrl, &sa, &len) < 0) { 1580 if (errno != ENOTCONN) { 1581 syslog(LOG_ERR, "getpeername: %m"); 1582 return; 1583 } 1584 if (recvfrom(ctrl, buf, sizeof(buf), MSG_PEEK, &sa, &len) < 0) { 1585 syslog(LOG_ERR, "recvfrom: %m"); 1586 return; 1587 } 1588 connected = 0; 1589 } 1590 if (sa.sa_family != AF_INET) { 1591 syslog(LOG_ERR, "unexpected address family %u", sa.sa_family); 1592 return; 1593 } 1594 1595 hp = gethostbyaddr((char *) &sin->sin_addr.s_addr, 1596 sizeof (sin->sin_addr.s_addr), AF_INET); 1597 1598 host = hp?hp->h_name:inet_ntoa(sin->sin_addr); 1599 1600 switch (sep->se_log & ~MULOG_RFC931) { 1601 case 0: 1602 return; 1603 case 1: 1604 if (curdom == NULL || *curdom == '\0') 1605 break; 1606 dp = host + strlen(host) - strlen(curdom); 1607 if (dp < host) 1608 break; 1609 if (debug) 1610 fprintf(stderr, "check \"%s\" against curdom \"%s\"\n", 1611 host, curdom); 1612 if (strcasecmp(dp, curdom) == 0) 1613 return; 1614 break; 1615 case 2: 1616 default: 1617 break; 1618 } 1619 1620 openlog("", LOG_NOWAIT, MULOG); 1621 1622 if (connected && (sep->se_log & MULOG_RFC931)) 1623 syslog(LOG_INFO, "%s@%s wants %s", 1624 rfc931_name(sin, ctrl), host, sep->se_service); 1625 else 1626 syslog(LOG_INFO, "%s wants %s", 1627 host, sep->se_service); 1628 } 1629 /* 1630 * From tcp_log by 1631 * Wietse Venema, Eindhoven University of Technology, The Netherlands. 1632 */ 1633 #if 0 1634 static char sccsid[] = "@(#) rfc931.c 1.3 92/08/31 22:54:46"; 1635 #endif 1636 1637 #include <setjmp.h> 1638 1639 #define RFC931_PORT 113 /* Semi-well-known port */ 1640 #define TIMEOUT 4 1641 #define TIMEOUT2 10 1642 1643 static jmp_buf timebuf; 1644 1645 /* timeout - handle timeouts */ 1646 1647 static void timeout(sig) 1648 int sig; 1649 { 1650 longjmp(timebuf, sig); 1651 } 1652 1653 /* rfc931_name - return remote user name */ 1654 1655 char * 1656 rfc931_name(there, ctrl) 1657 struct sockaddr_in *there; /* remote link information */ 1658 int ctrl; 1659 { 1660 struct sockaddr_in here; /* local link information */ 1661 struct sockaddr_in sin; /* for talking to RFC931 daemon */ 1662 int length; 1663 int s; 1664 unsigned remote; 1665 unsigned local; 1666 static char user[256]; /* XXX */ 1667 char buf[256]; 1668 char *cp; 1669 char *result = "USER_UNKNOWN"; 1670 int len; 1671 1672 /* Find out local port number of our stdin. */ 1673 1674 length = sizeof(here); 1675 if (getsockname(ctrl, (struct sockaddr *) &here, &length) == -1) { 1676 syslog(LOG_ERR, "getsockname: %m"); 1677 return (result); 1678 } 1679 /* Set up timer so we won't get stuck. */ 1680 1681 if ((s = socket(AF_INET, SOCK_STREAM, 0)) == -1) { 1682 syslog(LOG_ERR, "socket: %m"); 1683 return (result); 1684 } 1685 1686 sin = here; 1687 sin.sin_port = htons(0); 1688 if (bind(s, (struct sockaddr *) &sin, sizeof(sin)) == -1) { 1689 syslog(LOG_ERR, "bind: %m"); 1690 return (result); 1691 } 1692 1693 signal(SIGALRM, timeout); 1694 if (setjmp(timebuf)) { 1695 close(s); /* not: fclose(fp) */ 1696 return (result); 1697 } 1698 alarm(TIMEOUT); 1699 1700 /* Connect to the RFC931 daemon. */ 1701 1702 sin = *there; 1703 sin.sin_port = htons(RFC931_PORT); 1704 if (connect(s, (struct sockaddr *) &sin, sizeof(sin)) == -1) { 1705 close(s); 1706 alarm(0); 1707 return (result); 1708 } 1709 1710 /* Query the RFC 931 server. Would 13-byte writes ever be broken up? */ 1711 (void)snprintf(buf, sizeof buf, "%u,%u\r\n", ntohs(there->sin_port), 1712 ntohs(here.sin_port)); 1713 1714 1715 for (len = 0, cp = buf; len < strlen(buf); ) { 1716 int n; 1717 1718 if ((n = write(s, cp, strlen(buf) - len)) == -1) { 1719 close(s); 1720 alarm(0); 1721 return (result); 1722 } 1723 cp += n; 1724 len += n; 1725 } 1726 1727 /* Read response */ 1728 for (cp = buf; cp < buf + sizeof(buf) - 1; ) { 1729 char c; 1730 if (read(s, &c, 1) != 1) { 1731 close(s); 1732 alarm(0); 1733 return (result); 1734 } 1735 if (c == '\n') 1736 break; 1737 *cp++ = c; 1738 } 1739 *cp = '\0'; 1740 1741 if (sscanf(buf, "%u , %u : USERID :%*[^:]:%255s", &remote, &local, user) == 3 1742 && ntohs(there->sin_port) == remote 1743 && ntohs(here.sin_port) == local) { 1744 1745 /* Strip trailing carriage return. */ 1746 if (cp = strchr(user, '\r')) 1747 *cp = 0; 1748 result = user; 1749 } 1750 1751 alarm(0); 1752 close(s); 1753 return (result); 1754 } 1755 #endif 1756
Indexes created Thu Sep 25 16:09:42 GMT 2025