inetd.c revision 1.26
1 /* $NetBSD: inetd.c,v 1.26 1997/03/13 18:08:19 mycroft Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1991, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #ifndef lint 37 static char copyright[] = 38 "@(#) Copyright (c) 1983, 1991, 1993, 1994\n\ 39 The Regents of the University of California. All rights reserved.\n"; 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)inetd.c 8.4 (Berkeley) 4/13/94"; 45 #else 46 static char rcsid[] = "$NetBSD: inetd.c,v 1.26 1997/03/13 18:08:19 mycroft Exp $"; 47 #endif 48 #endif /* not lint */ 49 50 /* 51 * Inetd - Internet super-server 52 * 53 * This program invokes all internet services as needed. Connection-oriented 54 * services are invoked each time a connection is made, by creating a process. 55 * This process is passed the connection as file descriptor 0 and is expected 56 * to do a getpeername to find out the source host and port. 57 * 58 * Datagram oriented services are invoked when a datagram 59 * arrives; a process is created and passed a pending message 60 * on file descriptor 0. Datagram servers may either connect 61 * to their peer, freeing up the original socket for inetd 62 * to receive further messages on, or ``take over the socket'', 63 * processing all arriving datagrams and, eventually, timing 64 * out. The first type of server is said to be ``multi-threaded''; 65 * the second type of server ``single-threaded''. 66 * 67 * Inetd uses a configuration file which is read at startup 68 * and, possibly, at some later time in response to a hangup signal. 69 * The configuration file is ``free format'' with fields given in the 70 * order shown below. Continuation lines for an entry must being with 71 * a space or tab. All fields must be present in each entry. 72 * 73 * service name must be in /etc/services or must 74 * name a tcpmux service 75 * socket type stream/dgram/raw/rdm/seqpacket 76 * protocol must be in /etc/protocols 77 * wait/nowait[.max] single-threaded/multi-threaded, max # 78 * user[.group] user/group to run daemon as 79 * server program full path name 80 * server program arguments maximum of MAXARGS (20) 81 * 82 * For RPC services 83 * service name/version must be in /etc/rpc 84 * socket type stream/dgram/raw/rdm/seqpacket 85 * protocol must be in /etc/protocols 86 * wait/nowait[.max] single-threaded/multi-threaded 87 * user[.group] user to run daemon as 88 * server program full path name 89 * server program arguments maximum of MAXARGS (20) 90 * 91 * For non-RPC services, the "service name" can be of the form 92 * hostaddress:servicename, in which case the hostaddress is used 93 * as the host portion of the address to listen on. If hostaddress 94 * consists of a single `*' character, INADDR_ANY is used. 95 * 96 * A line can also consist of just 97 * hostaddress: 98 * where hostaddress is as in the preceding paragraph. Such a line must 99 * have no further fields; the specified hostaddress is remembered and 100 * used for all further lines that have no hostaddress specified, 101 * until the next such line (or EOF). (This is why * is provided to 102 * allow explicit specification of INADDR_ANY.) A line 103 * *: 104 * is implicitly in effect at the beginning of the file. 105 * 106 * The hostaddress specifier may (and often will) contain dots; 107 * the service name must not. 108 * 109 * For RPC services, host-address specifiers are accepted and will 110 * work to some extent; however, because of limitations in the 111 * portmapper interface, it will not work to try to give more than 112 * one line for any given RPC service, even if the host-address 113 * specifiers are different. 114 * 115 * TCP services without official port numbers are handled with the 116 * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for 117 * requests. When a connection is made from a foreign host, the service 118 * requested is passed to tcpmux, which looks it up in the servtab list 119 * and returns the proper entry for the service. Tcpmux returns a 120 * negative reply if the service doesn't exist, otherwise the invoked 121 * server is expected to return the positive reply if the service type in 122 * inetd.conf file has the prefix "tcpmux/". If the service type has the 123 * prefix "tcpmux/+", tcpmux will return the positive reply for the 124 * process; this is for compatibility with older server code, and also 125 * allows you to invoke programs that use stdin/stdout without putting any 126 * special server code in them. Services that use tcpmux are "nowait" 127 * because they do not have a well-known port and hence cannot listen 128 * for new requests. 129 * 130 * Comment lines are indicated by a `#' in column 1. 131 */ 132 133 /* 134 * Here's the scoop concerning the user.group feature: 135 * 136 * 1) set-group-option off. 137 * 138 * a) user = root: NO setuid() or setgid() is done 139 * 140 * b) other: setuid() 141 * setgid(primary group as found in passwd) 142 * initgroups(name, primary group) 143 * 144 * 2) set-group-option on. 145 * 146 * a) user = root: NO setuid() 147 * setgid(specified group) 148 * NO initgroups() 149 * 150 * b) other: setuid() 151 * setgid(specified group) 152 * initgroups(name, specified group) 153 * 154 */ 155 156 #include <sys/param.h> 157 #include <sys/stat.h> 158 #include <sys/ioctl.h> 159 #include <sys/socket.h> 160 #include <sys/un.h> 161 #include <sys/wait.h> 162 #include <sys/time.h> 163 #include <sys/resource.h> 164 165 #ifndef RLIMIT_NOFILE 166 #define RLIMIT_NOFILE RLIMIT_OFILE 167 #endif 168 169 #define RPC 170 171 #include <netinet/in.h> 172 #include <arpa/inet.h> 173 #ifdef RPC 174 #include <rpc/rpc.h> 175 #endif 176 177 #include <errno.h> 178 #include <grp.h> 179 #include <netdb.h> 180 #include <pwd.h> 181 #include <signal.h> 182 #include <stdio.h> 183 #include <stdlib.h> 184 #include <string.h> 185 #include <syslog.h> 186 #include <unistd.h> 187 188 #include "pathnames.h" 189 190 #ifdef LIBWRAP 191 # include <tcpd.h> 192 #ifndef LIBWRAP_ALLOW_FACILITY 193 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH 194 #endif 195 #ifndef LIBWRAP_ALLOW_SEVERITY 196 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO 197 #endif 198 #ifndef LIBWRAP_DENY_FACILITY 199 # define LIBWRAP_DENY_FACILITY LOG_AUTH 200 #endif 201 #ifndef LIBWRAP_DENY_SEVERITY 202 # define LIBWRAP_DENY_SEVERITY LOG_WARNING 203 #endif 204 int allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY; 205 int deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY; 206 #endif 207 208 #define TOOMANY 40 /* don't start more than TOOMANY */ 209 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */ 210 #define RETRYTIME (60*10) /* retry after bind or server fail */ 211 212 #define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM)) 213 214 int debug; 215 #ifdef LIBWRAP 216 int lflag; 217 #endif 218 int nsock, maxsock; 219 fd_set allsock; 220 int options; 221 int timingout; 222 struct servent *sp; 223 char *curdom; 224 225 #ifndef OPEN_MAX 226 #define OPEN_MAX 64 227 #endif 228 229 /* Reserve some descriptors, 3 stdio + at least: 1 log, 1 conf. file */ 230 #define FD_MARGIN (8) 231 typeof(((struct rlimit *)0)->rlim_cur) rlim_ofile_cur = OPEN_MAX; 232 233 #ifdef RLIMIT_NOFILE 234 struct rlimit rlim_ofile; 235 #endif 236 237 struct servtab { 238 char *se_hostaddr; /* host address to listen on */ 239 char *se_service; /* name of service */ 240 int se_socktype; /* type of socket to use */ 241 int se_family; /* address family */ 242 char *se_proto; /* protocol used */ 243 int se_rpcprog; /* rpc program number */ 244 int se_rpcversl; /* rpc program lowest version */ 245 int se_rpcversh; /* rpc program highest version */ 246 #define isrpcservice(sep) ((sep)->se_rpcversl != 0) 247 short se_wait; /* single threaded server */ 248 short se_checked; /* looked at during merge */ 249 char *se_user; /* user name to run as */ 250 char *se_group; /* group name to run as */ 251 struct biltin *se_bi; /* if built-in, description */ 252 char *se_server; /* server program */ 253 #define MAXARGV 20 254 char *se_argv[MAXARGV+1]; /* program arguments */ 255 int se_fd; /* open descriptor */ 256 int se_type; /* type */ 257 union { 258 struct sockaddr se_un_ctrladdr; 259 struct sockaddr_in se_un_ctrladdr_in; 260 struct sockaddr_un se_un_ctrladdr_un; 261 } se_un; /* bound address */ 262 #define se_ctrladdr se_un.se_un_ctrladdr 263 #define se_ctrladdr_in se_un.se_un_ctrladdr_in 264 #define se_ctrladdr_un se_un.se_un_ctrladdr_un 265 int se_ctrladdr_size; 266 int se_max; /* max # of instances of this service */ 267 int se_count; /* number started since se_time */ 268 struct timeval se_time; /* start of se_count */ 269 #ifdef MULOG 270 int se_log; 271 #define MULOG_RFC931 0x40000000 272 #endif 273 struct servtab *se_next; 274 } *servtab; 275 276 #define NORM_TYPE 0 277 #define MUX_TYPE 1 278 #define MUXPLUS_TYPE 2 279 #define ISMUX(sep) (((sep)->se_type == MUX_TYPE) || \ 280 ((sep)->se_type == MUXPLUS_TYPE)) 281 #define ISMUXPLUS(sep) ((sep)->se_type == MUXPLUS_TYPE) 282 283 284 void chargen_dg __P((int, struct servtab *)); 285 void chargen_stream __P((int, struct servtab *)); 286 void close_sep __P((struct servtab *)); 287 void config __P((int)); 288 void daytime_dg __P((int, struct servtab *)); 289 void daytime_stream __P((int, struct servtab *)); 290 void discard_dg __P((int, struct servtab *)); 291 void discard_stream __P((int, struct servtab *)); 292 void echo_dg __P((int, struct servtab *)); 293 void echo_stream __P((int, struct servtab *)); 294 void endconfig __P((void)); 295 struct servtab *enter __P((struct servtab *)); 296 void freeconfig __P((struct servtab *)); 297 struct servtab *getconfigent __P((void)); 298 void goaway __P((int)); 299 void machtime_dg __P((int, struct servtab *)); 300 void machtime_stream __P((int, struct servtab *)); 301 char *newstr __P((char *)); 302 char *nextline __P((FILE *)); 303 void print_service __P((char *, struct servtab *)); 304 void reapchild __P((int)); 305 void retry __P((int)); 306 int setconfig __P((void)); 307 void setup __P((struct servtab *)); 308 char *sskip __P((char **)); 309 char *skip __P((char **)); 310 struct servtab *tcpmux __P((int)); 311 void usage __P((void)); 312 313 struct biltin { 314 char *bi_service; /* internally provided service name */ 315 int bi_socktype; /* type of socket supported */ 316 short bi_fork; /* 1 if should fork before call */ 317 short bi_wait; /* 1 if should wait for child */ 318 void (*bi_fn)(); /* function which performs it */ 319 } biltins[] = { 320 /* Echo received data */ 321 { "echo", SOCK_STREAM, 1, 0, echo_stream }, 322 { "echo", SOCK_DGRAM, 0, 0, echo_dg }, 323 324 /* Internet /dev/null */ 325 { "discard", SOCK_STREAM, 1, 0, discard_stream }, 326 { "discard", SOCK_DGRAM, 0, 0, discard_dg }, 327 328 /* Return 32 bit time since 1900 */ 329 { "time", SOCK_STREAM, 0, 0, machtime_stream }, 330 { "time", SOCK_DGRAM, 0, 0, machtime_dg }, 331 332 /* Return human-readable time */ 333 { "daytime", SOCK_STREAM, 0, 0, daytime_stream }, 334 { "daytime", SOCK_DGRAM, 0, 0, daytime_dg }, 335 336 /* Familiar character generator */ 337 { "chargen", SOCK_STREAM, 1, 0, chargen_stream }, 338 { "chargen", SOCK_DGRAM, 0, 0, chargen_dg }, 339 340 { "tcpmux", SOCK_STREAM, 1, 0, (void (*)())tcpmux }, 341 342 { NULL } 343 }; 344 345 #define NUMINT (sizeof(intab) / sizeof(struct inent)) 346 char *CONFIG = _PATH_INETDCONF; 347 char **Argv; 348 char *LastArg; 349 extern char *__progname; 350 351 #ifdef sun 352 /* 353 * Sun's RPC library caches the result of `dtablesize()' 354 * This is incompatible with our "bumping" of file descriptors "on demand" 355 */ 356 int 357 _rpc_dtablesize() 358 { 359 return rlim_ofile_cur; 360 } 361 #endif 362 363 main(argc, argv, envp) 364 int argc; 365 char *argv[], *envp[]; 366 { 367 struct servtab *sep, *nsep; 368 struct passwd *pwd; 369 struct group *grp; 370 struct sigvec sv; 371 int tmpint, ch, dofork; 372 pid_t pid; 373 char buf[50]; 374 #ifdef LIBWRAP 375 struct request_info req; 376 int denied; 377 char *service; 378 #endif 379 380 Argv = argv; 381 if (envp == 0 || *envp == 0) 382 envp = argv; 383 while (*envp) 384 envp++; 385 LastArg = envp[-1] + strlen(envp[-1]); 386 387 while ((ch = getopt(argc, argv, 388 #ifdef LIBWRAP 389 "dl" 390 #else 391 "d" 392 #endif 393 )) != EOF) 394 switch(ch) { 395 case 'd': 396 debug = 1; 397 options |= SO_DEBUG; 398 break; 399 #ifdef LIBWRAP 400 case 'l': 401 lflag = 1; 402 break; 403 #endif 404 case '?': 405 default: 406 usage(); 407 } 408 argc -= optind; 409 argv += optind; 410 411 if (argc > 0) 412 CONFIG = argv[0]; 413 414 if (debug == 0) 415 daemon(0, 0); 416 openlog(__progname, LOG_PID | LOG_NOWAIT, LOG_DAEMON); 417 logpid(); 418 419 #ifdef RLIMIT_NOFILE 420 if (getrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) { 421 syslog(LOG_ERR, "getrlimit: %m"); 422 } else { 423 rlim_ofile_cur = rlim_ofile.rlim_cur; 424 if (rlim_ofile_cur == RLIM_INFINITY) /* ! */ 425 rlim_ofile_cur = OPEN_MAX; 426 } 427 #endif 428 429 memset(&sv, 0, sizeof(sv)); 430 sv.sv_mask = SIGBLOCK; 431 sv.sv_handler = retry; 432 sigvec(SIGALRM, &sv, (struct sigvec *)0); 433 config(SIGHUP); 434 sv.sv_handler = config; 435 sigvec(SIGHUP, &sv, (struct sigvec *)0); 436 sv.sv_handler = reapchild; 437 sigvec(SIGCHLD, &sv, (struct sigvec *)0); 438 sv.sv_handler = goaway; 439 sigvec(SIGTERM, &sv, (struct sigvec *)0); 440 sv.sv_handler = goaway; 441 sigvec(SIGINT, &sv, (struct sigvec *)0); 442 443 { 444 /* space for daemons to overwrite environment for ps */ 445 #define DUMMYSIZE 100 446 char dummy[DUMMYSIZE]; 447 448 (void)memset(dummy, 'x', DUMMYSIZE - 1); 449 dummy[DUMMYSIZE - 1] = '\0'; 450 451 (void)setenv("inetd_dummy", dummy, 1); 452 } 453 454 for (;;) { 455 int n, ctrl; 456 fd_set readable; 457 458 if (nsock == 0) { 459 (void) sigblock(SIGBLOCK); 460 while (nsock == 0) 461 sigpause(0L); 462 (void) sigsetmask(0L); 463 } 464 readable = allsock; 465 if ((n = select(maxsock + 1, &readable, (fd_set *)0, 466 (fd_set *)0, (struct timeval *)0)) <= 0) { 467 if (n < 0 && errno != EINTR) 468 syslog(LOG_WARNING, "select: %m"); 469 sleep(1); 470 continue; 471 } 472 for (sep = servtab; n && sep; sep = nsep) { 473 nsep = sep->se_next; 474 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) { 475 n--; 476 if (debug) 477 fprintf(stderr, "someone wants %s\n", sep->se_service); 478 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 479 /* XXX here do the libwrap check-before-accept */ 480 ctrl = accept(sep->se_fd, (struct sockaddr *)0, 481 (int *)0); 482 if (debug) 483 fprintf(stderr, "accept, ctrl %d\n", ctrl); 484 if (ctrl < 0) { 485 if (errno != EINTR) 486 syslog(LOG_WARNING, 487 "accept (for %s): %m", 488 sep->se_service); 489 continue; 490 } 491 /* 492 * Call tcpmux to find the real service to exec. 493 */ 494 if (sep->se_bi && 495 sep->se_bi->bi_fn == (void (*)()) tcpmux) { 496 sep = tcpmux(ctrl); 497 if (sep == NULL) { 498 close(ctrl); 499 continue; 500 } 501 } 502 } else 503 ctrl = sep->se_fd; 504 (void) sigblock(SIGBLOCK); 505 pid = 0; 506 #ifdef LIBWRAP 507 dofork = 1; 508 #else 509 dofork = (sep->se_bi == 0 || sep->se_bi->bi_fork); 510 #endif 511 if (dofork) { 512 if (sep->se_count++ == 0) 513 (void)gettimeofday(&sep->se_time, 514 (struct timezone *)0); 515 else if (sep->se_count >= sep->se_max) { 516 struct timeval now; 517 518 (void)gettimeofday(&now, (struct timezone *)0); 519 if (now.tv_sec - sep->se_time.tv_sec > 520 CNT_INTVL) { 521 sep->se_time = now; 522 sep->se_count = 1; 523 } else { 524 syslog(LOG_ERR, 525 "%s/%s server failing (looping), service terminated\n", 526 sep->se_service, sep->se_proto); 527 close_sep(sep); 528 sigsetmask(0L); 529 if (!timingout) { 530 timingout = 1; 531 alarm(RETRYTIME); 532 } 533 continue; 534 } 535 } 536 pid = fork(); 537 if (pid < 0) { 538 syslog(LOG_ERR, "fork: %m"); 539 if (sep->se_socktype == SOCK_STREAM) 540 close(ctrl); 541 sigsetmask(0L); 542 sleep(1); 543 continue; 544 } 545 if (pid != 0 && sep->se_wait) { 546 sep->se_wait = pid; 547 FD_CLR(sep->se_fd, &allsock); 548 nsock--; 549 } 550 if (pid == 0 && debug) 551 setsid(); 552 } 553 sigsetmask(0L); 554 if (pid == 0) { 555 #ifdef LIBWRAP 556 request_init(&req, RQ_DAEMON, sep->se_argv[0] ? 557 sep->se_argv[0] : sep->se_service, RQ_FILE, ctrl, 558 NULL); 559 fromhost(&req); 560 denied = !hosts_access(&req); 561 if (denied || lflag) { 562 sp = getservbyport(sep->se_ctrladdr_in.sin_port, 563 sep->se_proto); 564 if (sp == NULL) { 565 (void)snprintf(buf, sizeof buf, "%d", 566 ntohs(sep->se_ctrladdr_in.sin_port)); 567 service = buf; 568 } else 569 service = sp->s_name; 570 } 571 if (denied) { 572 syslog(deny_severity, "refused " 573 "connection from %.500s, service %s (%s)", 574 eval_client(&req), service, sep->se_proto); 575 goto reject; 576 } 577 if (lflag) { 578 syslog(allow_severity, 579 "connection from %.500s, service %s (%s)", 580 eval_client(&req), service, sep->se_proto); 581 } 582 #endif /* LIBWRAP */ 583 if (sep->se_bi) 584 (*sep->se_bi->bi_fn)(ctrl, sep); 585 else { 586 if ((pwd = getpwnam(sep->se_user)) == NULL) { 587 syslog(LOG_ERR, 588 "%s/%s: %s: No such user", 589 sep->se_service, sep->se_proto, 590 sep->se_user); 591 goto reject; 592 } 593 if (sep->se_group && 594 (grp = getgrnam(sep->se_group)) == NULL) { 595 syslog(LOG_ERR, 596 "%s/%s: %s: No such group", 597 sep->se_service, sep->se_proto, 598 sep->se_group); 599 goto reject; 600 } 601 if (pwd->pw_uid) { 602 if (sep->se_group) 603 pwd->pw_gid = grp->gr_gid; 604 if (setgid(pwd->pw_gid) < 0) { 605 syslog(LOG_ERR, 606 "%s/%s: can't set gid %d: %m", 607 sep->se_service, 608 sep->se_proto, pwd->pw_gid); 609 goto reject; 610 } 611 (void) initgroups(pwd->pw_name, 612 pwd->pw_gid); 613 if (setuid(pwd->pw_uid) < 0) { 614 syslog(LOG_ERR, 615 "%s/%s: can't set uid %d: %m", 616 sep->se_service, 617 sep->se_proto, pwd->pw_uid); 618 goto reject; 619 } 620 } else if (sep->se_group) { 621 (void) setgid((gid_t)grp->gr_gid); 622 } 623 if (debug) 624 fprintf(stderr, "%d execl %s\n", 625 getpid(), sep->se_server); 626 #ifdef MULOG 627 if (sep->se_log) 628 dolog(sep, ctrl); 629 #endif 630 if (ctrl != 0) { 631 dup2(ctrl, 0); 632 close(ctrl); 633 ctrl = 0; 634 } 635 dup2(0, 1); 636 dup2(0, 2); 637 #ifdef RLIMIT_NOFILE 638 if (rlim_ofile.rlim_cur != rlim_ofile_cur) { 639 if (setrlimit(RLIMIT_NOFILE, 640 &rlim_ofile) < 0) 641 syslog(LOG_ERR, 642 "setrlimit: %m"); 643 } 644 #endif 645 for (tmpint = rlim_ofile_cur-1; --tmpint > 2; ) 646 (void)close(tmpint); 647 execv(sep->se_server, sep->se_argv); 648 syslog(LOG_ERR, 649 "cannot execute %s: %m", sep->se_server); 650 reject: 651 if (sep->se_socktype != SOCK_STREAM) 652 recv(ctrl, buf, sizeof (buf), 0); 653 _exit(1); 654 } 655 } 656 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 657 close(ctrl); 658 } 659 } 660 } 661 } 662 663 void 664 reapchild(signo) 665 int signo; 666 { 667 int status; 668 pid_t pid; 669 struct servtab *sep; 670 671 for (;;) { 672 pid = wait3(&status, WNOHANG, (struct rusage *)0); 673 if (pid <= 0) 674 break; 675 if (debug) 676 fprintf(stderr, "%d reaped, status %#x\n", 677 pid, status); 678 for (sep = servtab; sep; sep = sep->se_next) 679 if (sep->se_wait == pid) { 680 if (WIFEXITED(status) && WEXITSTATUS(status)) 681 syslog(LOG_WARNING, 682 "%s: exit status 0x%x", 683 sep->se_server, WEXITSTATUS(status)); 684 else if (WIFSIGNALED(status)) 685 syslog(LOG_WARNING, 686 "%s: exit signal 0x%x", 687 sep->se_server, WTERMSIG(status)); 688 sep->se_wait = 1; 689 FD_SET(sep->se_fd, &allsock); 690 nsock++; 691 if (debug) 692 fprintf(stderr, "restored %s, fd %d\n", 693 sep->se_service, sep->se_fd); 694 } 695 } 696 } 697 698 void 699 config(signo) 700 int signo; 701 { 702 struct servtab *sep, *cp, **sepp; 703 struct passwd *pwd; 704 long omask; 705 int n; 706 707 if (!setconfig()) { 708 syslog(LOG_ERR, "%s: %m", CONFIG); 709 return; 710 } 711 for (sep = servtab; sep; sep = sep->se_next) 712 sep->se_checked = 0; 713 while (cp = getconfigent()) { 714 for (sep = servtab; sep; sep = sep->se_next) 715 if (strcmp(sep->se_service, cp->se_service) == 0 && 716 strcmp(sep->se_hostaddr, cp->se_hostaddr) == 0 && 717 strcmp(sep->se_proto, cp->se_proto) == 0 && 718 ISMUX(sep) == ISMUX(cp)) 719 break; 720 if (sep != 0) { 721 int i; 722 723 #define SWAP(type, a, b) {type c=(type)a; (type)a=(type)b; (type)b=(type)c;} 724 725 omask = sigblock(SIGBLOCK); 726 /* 727 * sep->se_wait may be holding the pid of a daemon 728 * that we're waiting for. If so, don't overwrite 729 * it unless the config file explicitly says don't 730 * wait. 731 */ 732 if (cp->se_bi == 0 && 733 (sep->se_wait == 1 || cp->se_wait == 0)) 734 sep->se_wait = cp->se_wait; 735 SWAP(char *, sep->se_user, cp->se_user); 736 SWAP(char *, sep->se_group, cp->se_group); 737 SWAP(char *, sep->se_server, cp->se_server); 738 for (i = 0; i < MAXARGV; i++) 739 SWAP(char *, sep->se_argv[i], cp->se_argv[i]); 740 SWAP(int, cp->se_type, sep->se_type); 741 SWAP(int, cp->se_max, sep->se_max); 742 #undef SWAP 743 if (isrpcservice(sep)) 744 unregister_rpc(sep); 745 sep->se_rpcversl = cp->se_rpcversl; 746 sep->se_rpcversh = cp->se_rpcversh; 747 sigsetmask(omask); 748 freeconfig(cp); 749 if (debug) 750 print_service("REDO", sep); 751 } else { 752 sep = enter(cp); 753 if (debug) 754 print_service("ADD ", sep); 755 } 756 sep->se_checked = 1; 757 758 switch (sep->se_family) { 759 case AF_UNIX: 760 if (sep->se_fd != -1) 761 break; 762 (void)unlink(sep->se_service); 763 n = strlen(sep->se_service); 764 if (n > sizeof(sep->se_ctrladdr_un.sun_path) - 1) 765 n = sizeof(sep->se_ctrladdr_un.sun_path) - 1; 766 strncpy(sep->se_ctrladdr_un.sun_path, 767 sep->se_service, n); 768 sep->se_ctrladdr_un.sun_family = AF_UNIX; 769 sep->se_ctrladdr_size = n + 770 sizeof(sep->se_ctrladdr_un) - 771 sizeof(sep->se_ctrladdr_un.sun_path); 772 if (!ISMUX(sep)) 773 setup(sep); 774 break; 775 case AF_INET: 776 sep->se_ctrladdr_in.sin_family = AF_INET; 777 if (!strcmp(sep->se_hostaddr,"*")) 778 sep->se_ctrladdr_in.sin_addr.s_addr = 779 INADDR_ANY; 780 else if (!inet_aton(sep->se_hostaddr, 781 &sep->se_ctrladdr_in.sin_addr)) { 782 /* Do we really want to support hostname lookups here? */ 783 struct hostent *hp; 784 hp = gethostbyname(sep->se_hostaddr); 785 if (hp == 0) { 786 syslog(LOG_ERR, "%s: unknown host", 787 sep->se_hostaddr); 788 sep->se_checked = 0; 789 continue; 790 } else if (hp->h_addrtype != AF_INET) { 791 syslog(LOG_ERR, 792 "%s: address isn't an Internet address", 793 sep->se_hostaddr); 794 sep->se_checked = 0; 795 continue; 796 } else if (hp->h_length != sizeof(struct in_addr)) { 797 syslog(LOG_ERR, 798 "%s: address size wrong (under DNS corruption attack?)", 799 sep->se_hostaddr); 800 sep->se_checked = 0; 801 continue; 802 } else { 803 memcpy(&sep->se_ctrladdr_in.sin_addr, 804 hp->h_addr_list[0], 805 sizeof(struct in_addr)); 806 } 807 } 808 if (ISMUX(sep)) { 809 sep->se_fd = -1; 810 continue; 811 } 812 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr_in); 813 if (isrpcservice(sep)) { 814 struct rpcent *rp; 815 816 sep->se_rpcprog = atoi(sep->se_service); 817 if (sep->se_rpcprog == 0) { 818 rp = getrpcbyname(sep->se_service); 819 if (rp == 0) { 820 syslog(LOG_ERR, 821 "%s/%s: unknown service", 822 sep->se_service, 823 sep->se_proto); 824 sep->se_checked = 0; 825 continue; 826 } 827 sep->se_rpcprog = rp->r_number; 828 } 829 if (sep->se_fd == -1 && !ISMUX(sep)) 830 setup(sep); 831 if (sep->se_fd != -1) 832 register_rpc(sep); 833 } else { 834 u_short port = htons(atoi(sep->se_service)); 835 836 if (!port) { 837 sp = getservbyname(sep->se_service, 838 sep->se_proto); 839 if (sp == 0) { 840 syslog(LOG_ERR, 841 "%s/%s: unknown service", 842 sep->se_service, 843 sep->se_proto); 844 sep->se_checked = 0; 845 continue; 846 } 847 port = sp->s_port; 848 } 849 if (port != sep->se_ctrladdr_in.sin_port) { 850 sep->se_ctrladdr_in.sin_port = port; 851 if (sep->se_fd >= 0) 852 close_sep(sep); 853 } 854 if (sep->se_fd == -1 && !ISMUX(sep)) 855 setup(sep); 856 } 857 } 858 } 859 endconfig(); 860 /* 861 * Purge anything not looked at above. 862 */ 863 omask = sigblock(SIGBLOCK); 864 sepp = &servtab; 865 while (sep = *sepp) { 866 if (sep->se_checked) { 867 sepp = &sep->se_next; 868 continue; 869 } 870 *sepp = sep->se_next; 871 if (sep->se_fd >= 0) 872 close_sep(sep); 873 if (isrpcservice(sep)) 874 unregister_rpc(sep); 875 if (sep->se_family == AF_UNIX) 876 (void)unlink(sep->se_service); 877 if (debug) 878 print_service("FREE", sep); 879 freeconfig(sep); 880 free((char *)sep); 881 } 882 (void) sigsetmask(omask); 883 } 884 885 void 886 retry(signo) 887 int signo; 888 { 889 struct servtab *sep; 890 891 timingout = 0; 892 for (sep = servtab; sep; sep = sep->se_next) { 893 if (sep->se_fd == -1 && !ISMUX(sep)) { 894 switch (sep->se_family) { 895 case AF_UNIX: 896 case AF_INET: 897 setup(sep); 898 if (sep->se_fd != -1 && isrpcservice(sep)) 899 register_rpc(sep); 900 break; 901 } 902 } 903 } 904 } 905 906 void 907 goaway(signo) 908 int signo; 909 { 910 register struct servtab *sep; 911 912 for (sep = servtab; sep; sep = sep->se_next) { 913 if (sep->se_fd == -1) 914 continue; 915 916 switch (sep->se_family) { 917 case AF_UNIX: 918 (void)unlink(sep->se_service); 919 break; 920 case AF_INET: 921 if (sep->se_wait == 1 && isrpcservice(sep)) 922 unregister_rpc(sep); 923 break; 924 } 925 (void)close(sep->se_fd); 926 } 927 (void)unlink(_PATH_INETDPID); 928 exit(0); 929 } 930 931 void 932 setup(sep) 933 struct servtab *sep; 934 { 935 int on = 1; 936 937 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) { 938 if (debug) 939 fprintf(stderr, "socket failed on %s/%s: %s\n", 940 sep->se_service, sep->se_proto, strerror(errno)); 941 syslog(LOG_ERR, "%s/%s: socket: %m", 942 sep->se_service, sep->se_proto); 943 return; 944 } 945 #define turnon(fd, opt) \ 946 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 947 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 948 turnon(sep->se_fd, SO_DEBUG) < 0) 949 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 950 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 951 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 952 #undef turnon 953 if (bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size) < 0) { 954 if (debug) 955 fprintf(stderr, "bind failed on %s/%s: %s\n", 956 sep->se_service, sep->se_proto, strerror(errno)); 957 syslog(LOG_ERR, "%s/%s: bind: %m", 958 sep->se_service, sep->se_proto); 959 (void) close(sep->se_fd); 960 sep->se_fd = -1; 961 if (!timingout) { 962 timingout = 1; 963 alarm(RETRYTIME); 964 } 965 return; 966 } 967 if (sep->se_socktype == SOCK_STREAM) 968 listen(sep->se_fd, 10); 969 970 FD_SET(sep->se_fd, &allsock); 971 nsock++; 972 if (sep->se_fd > maxsock) { 973 maxsock = sep->se_fd; 974 if (maxsock > rlim_ofile_cur - FD_MARGIN) 975 bump_nofile(); 976 } 977 if (debug) 978 fprintf(stderr, "registered %s on %d\n", 979 sep->se_server, sep->se_fd); 980 } 981 982 /* 983 * Finish with a service and its socket. 984 */ 985 void 986 close_sep(sep) 987 struct servtab *sep; 988 { 989 if (sep->se_fd >= 0) { 990 nsock--; 991 FD_CLR(sep->se_fd, &allsock); 992 (void) close(sep->se_fd); 993 sep->se_fd = -1; 994 } 995 sep->se_count = 0; 996 /* 997 * Don't keep the pid of this running deamon: when reapchild() 998 * reaps this pid, it would erroneously increment nsock. 999 */ 1000 if (sep->se_wait > 1) 1001 sep->se_wait = 1; 1002 } 1003 1004 register_rpc(sep) 1005 register struct servtab *sep; 1006 { 1007 #ifdef RPC 1008 int n; 1009 struct sockaddr_in sin; 1010 struct protoent *pp; 1011 1012 if ((pp = getprotobyname(sep->se_proto+4)) == NULL) { 1013 syslog(LOG_ERR, "%s: getproto: %m", 1014 sep->se_proto); 1015 return; 1016 } 1017 n = sizeof sin; 1018 if (getsockname(sep->se_fd, (struct sockaddr *)&sin, &n) < 0) { 1019 syslog(LOG_ERR, "%s/%s: getsockname: %m", 1020 sep->se_service, sep->se_proto); 1021 return; 1022 } 1023 1024 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1025 if (debug) 1026 fprintf(stderr, "pmap_set: %u %u %u %u\n", 1027 sep->se_rpcprog, n, pp->p_proto, 1028 ntohs(sin.sin_port)); 1029 (void)pmap_unset(sep->se_rpcprog, n); 1030 if (!pmap_set(sep->se_rpcprog, n, pp->p_proto, ntohs(sin.sin_port))) 1031 syslog(LOG_ERR, "pmap_set: %u %u %u %u: %m", 1032 sep->se_rpcprog, n, pp->p_proto, 1033 ntohs(sin.sin_port)); 1034 } 1035 #endif /* RPC */ 1036 } 1037 1038 unregister_rpc(sep) 1039 register struct servtab *sep; 1040 { 1041 #ifdef RPC 1042 int n; 1043 1044 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1045 if (debug) 1046 fprintf(stderr, "pmap_unset(%u, %u)\n", 1047 sep->se_rpcprog, n); 1048 if (!pmap_unset(sep->se_rpcprog, n)) 1049 syslog(LOG_ERR, "pmap_unset(%u, %u)\n", 1050 sep->se_rpcprog, n); 1051 } 1052 #endif /* RPC */ 1053 } 1054 1055 1056 struct servtab * 1057 enter(cp) 1058 struct servtab *cp; 1059 { 1060 struct servtab *sep; 1061 long omask; 1062 1063 sep = (struct servtab *)malloc(sizeof (*sep)); 1064 if (sep == (struct servtab *)0) { 1065 syslog(LOG_ERR, "Out of memory."); 1066 exit(-1); 1067 } 1068 *sep = *cp; 1069 sep->se_fd = -1; 1070 sep->se_rpcprog = -1; 1071 omask = sigblock(SIGBLOCK); 1072 sep->se_next = servtab; 1073 servtab = sep; 1074 sigsetmask(omask); 1075 return (sep); 1076 } 1077 1078 FILE *fconfig = NULL; 1079 struct servtab serv; 1080 char line[LINE_MAX]; 1081 char *defhost; 1082 1083 int 1084 setconfig() 1085 { 1086 if (defhost) free(defhost); 1087 defhost = newstr("*"); 1088 if (fconfig != NULL) { 1089 fseek(fconfig, 0L, SEEK_SET); 1090 return (1); 1091 } 1092 fconfig = fopen(CONFIG, "r"); 1093 return (fconfig != NULL); 1094 } 1095 1096 void 1097 endconfig() 1098 { 1099 if (fconfig) { 1100 (void) fclose(fconfig); 1101 fconfig = NULL; 1102 } 1103 if (defhost) { 1104 free(defhost); 1105 defhost = 0; 1106 } 1107 } 1108 1109 struct servtab * 1110 getconfigent() 1111 { 1112 struct servtab *sep = &serv; 1113 int argc; 1114 char *cp, *arg; 1115 static char TCPMUX_TOKEN[] = "tcpmux/"; 1116 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) 1117 char *hostdelim; 1118 1119 more: 1120 #ifdef MULOG 1121 while ((cp = nextline(fconfig)) && (*cp == '#' || *cp == '\0')) { 1122 /* Avoid use of `skip' if there is a danger of it looking 1123 * at continuation lines. 1124 */ 1125 do { 1126 cp++; 1127 } while (*cp == ' ' || *cp == '\t'); 1128 if (*cp == '\0') 1129 continue; 1130 if ((arg = skip(&cp)) == NULL) 1131 continue; 1132 if (strcmp(arg, "DOMAIN")) 1133 continue; 1134 if (curdom) 1135 free(curdom); 1136 curdom = NULL; 1137 while (*cp == ' ' || *cp == '\t') 1138 cp++; 1139 if (*cp == '\0') 1140 continue; 1141 arg = cp; 1142 while (*cp && *cp != ' ' && *cp != '\t') 1143 cp++; 1144 if (*cp != '\0') 1145 *cp++ = '\0'; 1146 curdom = newstr(arg); 1147 } 1148 #else 1149 while ((cp = nextline(fconfig)) && (*cp == '#' || *cp == '\0')) 1150 ; 1151 #endif 1152 if (cp == NULL) 1153 return ((struct servtab *)0); 1154 /* 1155 * clear the static buffer, since some fields (se_ctrladdr, 1156 * for example) don't get initialized here. 1157 */ 1158 memset((caddr_t)sep, 0, sizeof *sep); 1159 arg = skip(&cp); 1160 if (cp == NULL) { 1161 /* got an empty line containing just blanks/tabs. */ 1162 goto more; 1163 } 1164 /* Check for a host name. */ 1165 hostdelim = strrchr(arg, ':'); 1166 if (hostdelim) { 1167 *hostdelim = '\0'; 1168 sep->se_hostaddr = newstr(arg); 1169 arg = hostdelim + 1; 1170 /* 1171 * If the line is of the form `host:', then just change the 1172 * default host for the following lines. 1173 */ 1174 if (*arg == '\0') { 1175 arg = skip(&cp); 1176 if (cp == NULL) { 1177 free(defhost); 1178 defhost = sep->se_hostaddr; 1179 goto more; 1180 } 1181 } 1182 } else 1183 sep->se_hostaddr = newstr(defhost); 1184 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1185 char *c = arg + MUX_LEN; 1186 if (*c == '+') { 1187 sep->se_type = MUXPLUS_TYPE; 1188 c++; 1189 } else 1190 sep->se_type = MUX_TYPE; 1191 sep->se_service = newstr(c); 1192 } else { 1193 sep->se_service = newstr(arg); 1194 sep->se_type = NORM_TYPE; 1195 } 1196 1197 arg = sskip(&cp); 1198 if (strcmp(arg, "stream") == 0) 1199 sep->se_socktype = SOCK_STREAM; 1200 else if (strcmp(arg, "dgram") == 0) 1201 sep->se_socktype = SOCK_DGRAM; 1202 else if (strcmp(arg, "rdm") == 0) 1203 sep->se_socktype = SOCK_RDM; 1204 else if (strcmp(arg, "seqpacket") == 0) 1205 sep->se_socktype = SOCK_SEQPACKET; 1206 else if (strcmp(arg, "raw") == 0) 1207 sep->se_socktype = SOCK_RAW; 1208 else 1209 sep->se_socktype = -1; 1210 1211 sep->se_proto = newstr(sskip(&cp)); 1212 if (strcmp(sep->se_proto, "unix") == 0) { 1213 sep->se_family = AF_UNIX; 1214 } else { 1215 sep->se_family = AF_INET; 1216 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1217 #ifdef RPC 1218 char *cp, *ccp; 1219 cp = strchr(sep->se_service, '/'); 1220 if (cp == 0) { 1221 syslog(LOG_ERR, "%s: no rpc version", 1222 sep->se_service); 1223 goto more; 1224 } 1225 *cp++ = '\0'; 1226 sep->se_rpcversl = sep->se_rpcversh = 1227 strtol(cp, &ccp, 0); 1228 if (ccp == cp) { 1229 badafterall: 1230 syslog(LOG_ERR, "%s/%s: bad rpc version", 1231 sep->se_service, cp); 1232 goto more; 1233 } 1234 if (*ccp == '-') { 1235 cp = ccp + 1; 1236 sep->se_rpcversh = strtol(cp, &ccp, 0); 1237 if (ccp == cp) 1238 goto badafterall; 1239 } 1240 #else 1241 syslog(LOG_ERR, "%s: rpc services not suported", 1242 sep->se_service); 1243 goto more; 1244 #endif /* RPC */ 1245 } 1246 } 1247 arg = sskip(&cp); 1248 { 1249 char *cp; 1250 cp = strchr(arg, '.'); 1251 if (cp) { 1252 *cp++ = '\0'; 1253 sep->se_max = atoi(cp); 1254 } else 1255 sep->se_max = TOOMANY; 1256 } 1257 sep->se_wait = strcmp(arg, "wait") == 0; 1258 if (ISMUX(sep)) { 1259 /* 1260 * Silently enforce "nowait" for TCPMUX services since 1261 * they don't have an assigned port to listen on. 1262 */ 1263 sep->se_wait = 0; 1264 1265 if (strcmp(sep->se_proto, "tcp")) { 1266 syslog(LOG_ERR, 1267 "%s: bad protocol for tcpmux service %s", 1268 CONFIG, sep->se_service); 1269 goto more; 1270 } 1271 if (sep->se_socktype != SOCK_STREAM) { 1272 syslog(LOG_ERR, 1273 "%s: bad socket type for tcpmux service %s", 1274 CONFIG, sep->se_service); 1275 goto more; 1276 } 1277 } 1278 sep->se_user = newstr(sskip(&cp)); 1279 if (sep->se_group = strchr(sep->se_user, '.')) 1280 *sep->se_group++ = '\0'; 1281 sep->se_server = newstr(sskip(&cp)); 1282 if (strcmp(sep->se_server, "internal") == 0) { 1283 struct biltin *bi; 1284 1285 for (bi = biltins; bi->bi_service; bi++) 1286 if (bi->bi_socktype == sep->se_socktype && 1287 strcmp(bi->bi_service, sep->se_service) == 0) 1288 break; 1289 if (bi->bi_service == 0) { 1290 syslog(LOG_ERR, "internal service %s unknown", 1291 sep->se_service); 1292 goto more; 1293 } 1294 sep->se_bi = bi; 1295 sep->se_wait = bi->bi_wait; 1296 } else 1297 sep->se_bi = NULL; 1298 argc = 0; 1299 for (arg = skip(&cp); cp; arg = skip(&cp)) { 1300 #if MULOG 1301 char *colon; 1302 1303 if (argc == 0 && (colon = strrchr(arg, ':'))) { 1304 while (arg < colon) { 1305 int x; 1306 char *ccp; 1307 1308 switch (*arg++) { 1309 case 'l': 1310 x = 1; 1311 if (isdigit(*arg)) { 1312 x = strtol(arg, &ccp, 0); 1313 if (ccp == arg) 1314 break; 1315 arg = ccp; 1316 } 1317 sep->se_log &= ~MULOG_RFC931; 1318 sep->se_log |= x; 1319 break; 1320 case 'a': 1321 sep->se_log |= MULOG_RFC931; 1322 break; 1323 default: 1324 break; 1325 } 1326 } 1327 arg = colon + 1; 1328 } 1329 #endif 1330 if (argc < MAXARGV) 1331 sep->se_argv[argc++] = newstr(arg); 1332 } 1333 while (argc <= MAXARGV) 1334 sep->se_argv[argc++] = NULL; 1335 return (sep); 1336 } 1337 1338 void 1339 freeconfig(cp) 1340 struct servtab *cp; 1341 { 1342 int i; 1343 1344 if (cp->se_hostaddr) 1345 free(cp->se_hostaddr); 1346 if (cp->se_service) 1347 free(cp->se_service); 1348 if (cp->se_proto) 1349 free(cp->se_proto); 1350 if (cp->se_user) 1351 free(cp->se_user); 1352 /* Note: se_group is part of the newstr'ed se_user */ 1353 if (cp->se_server) 1354 free(cp->se_server); 1355 for (i = 0; i < MAXARGV; i++) 1356 if (cp->se_argv[i]) 1357 free(cp->se_argv[i]); 1358 } 1359 1360 1361 /* 1362 * Safe skip - if skip returns null, log a syntax error in the 1363 * configuration file and exit. 1364 */ 1365 char * 1366 sskip(cpp) 1367 char **cpp; 1368 { 1369 char *cp; 1370 1371 cp = skip(cpp); 1372 if (cp == NULL) { 1373 syslog(LOG_ERR, "%s: syntax error", CONFIG); 1374 exit(-1); 1375 } 1376 return (cp); 1377 } 1378 1379 char * 1380 skip(cpp) 1381 char **cpp; 1382 { 1383 char *cp = *cpp; 1384 char *start; 1385 1386 if (*cpp == NULL) 1387 return ((char *)0); 1388 1389 again: 1390 while (*cp == ' ' || *cp == '\t') 1391 cp++; 1392 if (*cp == '\0') { 1393 int c; 1394 1395 c = getc(fconfig); 1396 (void) ungetc(c, fconfig); 1397 if (c == ' ' || c == '\t') 1398 if (cp = nextline(fconfig)) 1399 goto again; 1400 *cpp = (char *)0; 1401 return ((char *)0); 1402 } 1403 start = cp; 1404 while (*cp && *cp != ' ' && *cp != '\t') 1405 cp++; 1406 if (*cp != '\0') 1407 *cp++ = '\0'; 1408 *cpp = cp; 1409 return (start); 1410 } 1411 1412 char * 1413 nextline(fd) 1414 FILE *fd; 1415 { 1416 char *cp; 1417 1418 if (fgets(line, sizeof (line), fd) == NULL) 1419 return ((char *)0); 1420 cp = strchr(line, '\n'); 1421 if (cp) 1422 *cp = '\0'; 1423 return (line); 1424 } 1425 1426 char * 1427 newstr(cp) 1428 char *cp; 1429 { 1430 if (cp = strdup(cp ? cp : "")) 1431 return (cp); 1432 syslog(LOG_ERR, "strdup: %m"); 1433 exit(-1); 1434 } 1435 1436 void 1437 inetd_setproctitle(a, s) 1438 char *a; 1439 int s; 1440 { 1441 int size; 1442 char *cp; 1443 struct sockaddr_in sin; 1444 char buf[80]; 1445 1446 cp = Argv[0]; 1447 size = sizeof(sin); 1448 if (getpeername(s, (struct sockaddr *)&sin, &size) == 0) 1449 (void)snprintf(buf, sizeof buf, "-%s [%s]", a, 1450 inet_ntoa(sin.sin_addr)); 1451 else 1452 (void)snprintf(buf, sizeof buf, "-%s", a); 1453 strncpy(cp, buf, LastArg - cp); 1454 cp += strlen(cp); 1455 while (cp < LastArg) 1456 *cp++ = ' '; 1457 } 1458 1459 logpid() 1460 { 1461 FILE *fp; 1462 1463 if ((fp = fopen(_PATH_INETDPID, "w")) != NULL) { 1464 fprintf(fp, "%u\n", getpid()); 1465 (void)fclose(fp); 1466 } 1467 } 1468 1469 bump_nofile() 1470 { 1471 #ifdef RLIMIT_NOFILE 1472 1473 #define FD_CHUNK 32 1474 1475 struct rlimit rl; 1476 1477 if (getrlimit(RLIMIT_NOFILE, &rl) < 0) { 1478 syslog(LOG_ERR, "getrlimit: %m"); 1479 return -1; 1480 } 1481 rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK); 1482 if (rl.rlim_cur <= rlim_ofile_cur) { 1483 syslog(LOG_ERR, 1484 "bump_nofile: cannot extend file limit, max = %d", 1485 rl.rlim_cur); 1486 return -1; 1487 } 1488 1489 if (setrlimit(RLIMIT_NOFILE, &rl) < 0) { 1490 syslog(LOG_ERR, "setrlimit: %m"); 1491 return -1; 1492 } 1493 1494 rlim_ofile_cur = rl.rlim_cur; 1495 return 0; 1496 1497 #else 1498 syslog(LOG_ERR, "bump_nofile: cannot extend file limit"); 1499 return -1; 1500 #endif 1501 } 1502 1503 /* 1504 * Internet services provided internally by inetd: 1505 */ 1506 #define BUFSIZE 4096 1507 1508 /* ARGSUSED */ 1509 void 1510 echo_stream(s, sep) /* Echo service -- echo data back */ 1511 int s; 1512 struct servtab *sep; 1513 { 1514 char buffer[BUFSIZE]; 1515 int i; 1516 1517 inetd_setproctitle(sep->se_service, s); 1518 while ((i = read(s, buffer, sizeof(buffer))) > 0 && 1519 write(s, buffer, i) > 0) 1520 ; 1521 exit(0); 1522 } 1523 1524 /* ARGSUSED */ 1525 void 1526 echo_dg(s, sep) /* Echo service -- echo data back */ 1527 int s; 1528 struct servtab *sep; 1529 { 1530 char buffer[BUFSIZE]; 1531 int i, size; 1532 struct sockaddr sa; 1533 1534 size = sizeof(sa); 1535 if ((i = recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size)) < 0) 1536 return; 1537 (void) sendto(s, buffer, i, 0, &sa, sizeof(sa)); 1538 } 1539 1540 /* ARGSUSED */ 1541 void 1542 discard_stream(s, sep) /* Discard service -- ignore data */ 1543 int s; 1544 struct servtab *sep; 1545 { 1546 char buffer[BUFSIZE]; 1547 1548 inetd_setproctitle(sep->se_service, s); 1549 while ((errno = 0, read(s, buffer, sizeof(buffer)) > 0) || 1550 errno == EINTR) 1551 ; 1552 exit(0); 1553 } 1554 1555 /* ARGSUSED */ 1556 void 1557 discard_dg(s, sep) /* Discard service -- ignore data */ 1558 int s; 1559 struct servtab *sep; 1560 { 1561 char buffer[BUFSIZE]; 1562 1563 (void) read(s, buffer, sizeof(buffer)); 1564 } 1565 1566 #include <ctype.h> 1567 #define LINESIZ 72 1568 char ring[128]; 1569 char *endring; 1570 1571 void 1572 initring() 1573 { 1574 int i; 1575 1576 endring = ring; 1577 1578 for (i = 0; i <= 128; ++i) 1579 if (isprint(i)) 1580 *endring++ = i; 1581 } 1582 1583 /* ARGSUSED */ 1584 void 1585 chargen_stream(s, sep) /* Character generator */ 1586 int s; 1587 struct servtab *sep; 1588 { 1589 int len; 1590 char *rs, text[LINESIZ+2]; 1591 1592 inetd_setproctitle(sep->se_service, s); 1593 1594 if (!endring) { 1595 initring(); 1596 rs = ring; 1597 } 1598 1599 text[LINESIZ] = '\r'; 1600 text[LINESIZ + 1] = '\n'; 1601 for (rs = ring;;) { 1602 if ((len = endring - rs) >= LINESIZ) 1603 memmove(text, rs, LINESIZ); 1604 else { 1605 memmove(text, rs, len); 1606 memmove(text + len, ring, LINESIZ - len); 1607 } 1608 if (++rs == endring) 1609 rs = ring; 1610 if (write(s, text, sizeof(text)) != sizeof(text)) 1611 break; 1612 } 1613 exit(0); 1614 } 1615 1616 /* ARGSUSED */ 1617 void 1618 chargen_dg(s, sep) /* Character generator */ 1619 int s; 1620 struct servtab *sep; 1621 { 1622 struct sockaddr sa; 1623 static char *rs; 1624 int len, size; 1625 char text[LINESIZ+2]; 1626 1627 if (endring == 0) { 1628 initring(); 1629 rs = ring; 1630 } 1631 1632 size = sizeof(sa); 1633 if (recvfrom(s, text, sizeof(text), 0, &sa, &size) < 0) 1634 return; 1635 1636 if ((len = endring - rs) >= LINESIZ) 1637 memmove(text, rs, LINESIZ); 1638 else { 1639 memmove(text, rs, len); 1640 memmove(text + len, ring, LINESIZ - len); 1641 } 1642 if (++rs == endring) 1643 rs = ring; 1644 text[LINESIZ] = '\r'; 1645 text[LINESIZ + 1] = '\n'; 1646 (void) sendto(s, text, sizeof(text), 0, &sa, sizeof(sa)); 1647 } 1648 1649 /* 1650 * Return a machine readable date and time, in the form of the 1651 * number of seconds since midnight, Jan 1, 1900. Since gettimeofday 1652 * returns the number of seconds since midnight, Jan 1, 1970, 1653 * we must add 2208988800 seconds to this figure to make up for 1654 * some seventy years Bell Labs was asleep. 1655 */ 1656 1657 long 1658 machtime() 1659 { 1660 struct timeval tv; 1661 1662 if (gettimeofday(&tv, (struct timezone *)0) < 0) { 1663 if (debug) 1664 fprintf(stderr, "Unable to get time of day\n"); 1665 return (0L); 1666 } 1667 #define OFFSET ((u_long)25567 * 24*60*60) 1668 return (htonl((long)(tv.tv_sec + OFFSET))); 1669 #undef OFFSET 1670 } 1671 1672 /* ARGSUSED */ 1673 void 1674 machtime_stream(s, sep) 1675 int s; 1676 struct servtab *sep; 1677 { 1678 long result; 1679 1680 result = machtime(); 1681 (void) write(s, (char *) &result, sizeof(result)); 1682 } 1683 1684 /* ARGSUSED */ 1685 void 1686 machtime_dg(s, sep) 1687 int s; 1688 struct servtab *sep; 1689 { 1690 long result; 1691 struct sockaddr sa; 1692 int size; 1693 1694 size = sizeof(sa); 1695 if (recvfrom(s, (char *)&result, sizeof(result), 0, &sa, &size) < 0) 1696 return; 1697 result = machtime(); 1698 (void) sendto(s, (char *) &result, sizeof(result), 0, &sa, sizeof(sa)); 1699 } 1700 1701 /* ARGSUSED */ 1702 void 1703 daytime_stream(s, sep) /* Return human-readable time of day */ 1704 int s; 1705 struct servtab *sep; 1706 { 1707 char buffer[256]; 1708 time_t clock; 1709 int len; 1710 1711 clock = time((time_t *) 0); 1712 1713 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 1714 (void) write(s, buffer, len); 1715 } 1716 1717 /* ARGSUSED */ 1718 void 1719 daytime_dg(s, sep) /* Return human-readable time of day */ 1720 int s; 1721 struct servtab *sep; 1722 { 1723 char buffer[256]; 1724 time_t clock; 1725 struct sockaddr sa; 1726 int size, len; 1727 1728 clock = time((time_t *) 0); 1729 1730 size = sizeof(sa); 1731 if (recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size) < 0) 1732 return; 1733 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 1734 (void) sendto(s, buffer, len, 0, &sa, sizeof(sa)); 1735 } 1736 1737 /* 1738 * print_service: 1739 * Dump relevant information to stderr 1740 */ 1741 void 1742 print_service(action, sep) 1743 char *action; 1744 struct servtab *sep; 1745 { 1746 if (isrpcservice(sep)) 1747 fprintf(stderr, 1748 "%s: %s rpcprog=%d, rpcvers = %d/%d, proto=%s, wait.max=%d.%d, user.group=%s.%s builtin=%lx server=%s\n", 1749 action, sep->se_service, 1750 sep->se_rpcprog, sep->se_rpcversh, sep->se_rpcversl, sep->se_proto, 1751 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 1752 (long)sep->se_bi, sep->se_server); 1753 else 1754 fprintf(stderr, 1755 "%s: %s proto=%s, wait.max=%d.%d, user.group=%s.%s builtin=%lx server=%s\n", 1756 action, sep->se_service, sep->se_proto, 1757 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 1758 (long)sep->se_bi, sep->se_server); 1759 } 1760 1761 void 1762 usage() 1763 { 1764 1765 #ifdef LIBWRAP 1766 (void)fprintf(stderr, "usage: %s [-dl] [conf]\n", __progname); 1767 #else 1768 (void)fprintf(stderr, "usage: %s [-d] [conf]\n", __progname); 1769 #endif 1770 exit(1); 1771 } 1772 1773 1774 /* 1775 * Based on TCPMUX.C by Mark K. Lottor November 1988 1776 * sri-nic::ps:<mkl>tcpmux.c 1777 */ 1778 1779 static int /* # of characters upto \r,\n or \0 */ 1780 getline(fd, buf, len) 1781 int fd; 1782 char *buf; 1783 int len; 1784 { 1785 int count = 0, n; 1786 1787 do { 1788 n = read(fd, buf, len-count); 1789 if (n == 0) 1790 return (count); 1791 if (n < 0) 1792 return (-1); 1793 while (--n >= 0) { 1794 if (*buf == '\r' || *buf == '\n' || *buf == '\0') 1795 return (count); 1796 count++; 1797 buf++; 1798 } 1799 } while (count < len); 1800 return (count); 1801 } 1802 1803 #define MAX_SERV_LEN (256+2) /* 2 bytes for \r\n */ 1804 1805 #define strwrite(fd, buf) (void) write(fd, buf, sizeof(buf)-1) 1806 1807 struct servtab * 1808 tcpmux(s) 1809 int s; 1810 { 1811 struct servtab *sep; 1812 char service[MAX_SERV_LEN+1]; 1813 int len; 1814 1815 /* Get requested service name */ 1816 if ((len = getline(s, service, MAX_SERV_LEN)) < 0) { 1817 strwrite(s, "-Error reading service name\r\n"); 1818 return (NULL); 1819 } 1820 service[len] = '\0'; 1821 1822 if (debug) 1823 fprintf(stderr, "tcpmux: someone wants %s\n", service); 1824 1825 /* 1826 * Help is a required command, and lists available services, 1827 * one per line. 1828 */ 1829 if (!strcasecmp(service, "help")) { 1830 for (sep = servtab; sep; sep = sep->se_next) { 1831 if (!ISMUX(sep)) 1832 continue; 1833 (void)write(s,sep->se_service,strlen(sep->se_service)); 1834 strwrite(s, "\r\n"); 1835 } 1836 return (NULL); 1837 } 1838 1839 /* Try matching a service in inetd.conf with the request */ 1840 for (sep = servtab; sep; sep = sep->se_next) { 1841 if (!ISMUX(sep)) 1842 continue; 1843 if (!strcasecmp(service, sep->se_service)) { 1844 if (ISMUXPLUS(sep)) { 1845 strwrite(s, "+Go\r\n"); 1846 } 1847 return (sep); 1848 } 1849 } 1850 strwrite(s, "-Service not available\r\n"); 1851 return (NULL); 1852 } 1853 1854 1855 #ifdef MULOG 1856 dolog(sep, ctrl) 1857 struct servtab *sep; 1858 int ctrl; 1859 { 1860 struct sockaddr sa; 1861 struct sockaddr_in *sin = (struct sockaddr_in *)&sa; 1862 int len = sizeof(sa); 1863 struct hostent *hp; 1864 char *host, *dp, buf[BUFSIZ], *rfc931_name(); 1865 int connected = 1; 1866 1867 if (sep->se_family != AF_INET) 1868 return; 1869 1870 if (getpeername(ctrl, &sa, &len) < 0) { 1871 if (errno != ENOTCONN) { 1872 syslog(LOG_ERR, "getpeername: %m"); 1873 return; 1874 } 1875 if (recvfrom(ctrl, buf, sizeof(buf), MSG_PEEK, &sa, &len) < 0) { 1876 syslog(LOG_ERR, "recvfrom: %m"); 1877 return; 1878 } 1879 connected = 0; 1880 } 1881 if (sa.sa_family != AF_INET) { 1882 syslog(LOG_ERR, "unexpected address family %u", sa.sa_family); 1883 return; 1884 } 1885 1886 hp = gethostbyaddr((char *) &sin->sin_addr.s_addr, 1887 sizeof (sin->sin_addr.s_addr), AF_INET); 1888 1889 host = hp?hp->h_name:inet_ntoa(sin->sin_addr); 1890 1891 switch (sep->se_log & ~MULOG_RFC931) { 1892 case 0: 1893 return; 1894 case 1: 1895 if (curdom == NULL || *curdom == '\0') 1896 break; 1897 dp = host + strlen(host) - strlen(curdom); 1898 if (dp < host) 1899 break; 1900 if (debug) 1901 fprintf(stderr, "check \"%s\" against curdom \"%s\"\n", 1902 host, curdom); 1903 if (strcasecmp(dp, curdom) == 0) 1904 return; 1905 break; 1906 case 2: 1907 default: 1908 break; 1909 } 1910 1911 openlog("", LOG_NOWAIT, MULOG); 1912 1913 if (connected && (sep->se_log & MULOG_RFC931)) 1914 syslog(LOG_INFO, "%s@%s wants %s", 1915 rfc931_name(sin, ctrl), host, sep->se_service); 1916 else 1917 syslog(LOG_INFO, "%s wants %s", 1918 host, sep->se_service); 1919 } 1920 1921 /* 1922 * From tcp_log by 1923 * Wietse Venema, Eindhoven University of Technology, The Netherlands. 1924 */ 1925 #if 0 1926 static char sccsid[] = "@(#) rfc931.c 1.3 92/08/31 22:54:46"; 1927 #endif 1928 1929 #include <setjmp.h> 1930 1931 #define RFC931_PORT 113 /* Semi-well-known port */ 1932 #define TIMEOUT 4 1933 #define TIMEOUT2 10 1934 1935 static jmp_buf timebuf; 1936 1937 /* timeout - handle timeouts */ 1938 1939 static void timeout(sig) 1940 int sig; 1941 { 1942 longjmp(timebuf, sig); 1943 } 1944 1945 /* rfc931_name - return remote user name */ 1946 1947 char * 1948 rfc931_name(there, ctrl) 1949 struct sockaddr_in *there; /* remote link information */ 1950 int ctrl; 1951 { 1952 struct sockaddr_in here; /* local link information */ 1953 struct sockaddr_in sin; /* for talking to RFC931 daemon */ 1954 int length; 1955 int s; 1956 unsigned remote; 1957 unsigned local; 1958 static char user[256]; /* XXX */ 1959 char buf[256]; 1960 char *cp; 1961 char *result = "USER_UNKNOWN"; 1962 int len; 1963 1964 /* Find out local port number of our stdin. */ 1965 1966 length = sizeof(here); 1967 if (getsockname(ctrl, (struct sockaddr *) &here, &length) == -1) { 1968 syslog(LOG_ERR, "getsockname: %m"); 1969 return (result); 1970 } 1971 /* Set up timer so we won't get stuck. */ 1972 1973 if ((s = socket(AF_INET, SOCK_STREAM, 0)) == -1) { 1974 syslog(LOG_ERR, "socket: %m"); 1975 return (result); 1976 } 1977 1978 sin = here; 1979 sin.sin_port = htons(0); 1980 if (bind(s, (struct sockaddr *) &sin, sizeof(sin)) == -1) { 1981 syslog(LOG_ERR, "bind: %m"); 1982 return (result); 1983 } 1984 1985 signal(SIGALRM, timeout); 1986 if (setjmp(timebuf)) { 1987 close(s); /* not: fclose(fp) */ 1988 return (result); 1989 } 1990 alarm(TIMEOUT); 1991 1992 /* Connect to the RFC931 daemon. */ 1993 1994 sin = *there; 1995 sin.sin_port = htons(RFC931_PORT); 1996 if (connect(s, (struct sockaddr *) &sin, sizeof(sin)) == -1) { 1997 close(s); 1998 alarm(0); 1999 return (result); 2000 } 2001 2002 /* Query the RFC 931 server. Would 13-byte writes ever be broken up? */ 2003 (void)snprintf(buf, sizeof buf, "%u,%u\r\n", ntohs(there->sin_port), 2004 ntohs(here.sin_port)); 2005 2006 2007 for (len = 0, cp = buf; len < strlen(buf); ) { 2008 int n; 2009 2010 if ((n = write(s, cp, strlen(buf) - len)) == -1) { 2011 close(s); 2012 alarm(0); 2013 return (result); 2014 } 2015 cp += n; 2016 len += n; 2017 } 2018 2019 /* Read response */ 2020 for (cp = buf; cp < buf + sizeof(buf) - 1; ) { 2021 char c; 2022 if (read(s, &c, 1) != 1) { 2023 close(s); 2024 alarm(0); 2025 return (result); 2026 } 2027 if (c == '\n') 2028 break; 2029 *cp++ = c; 2030 } 2031 *cp = '\0'; 2032 2033 if (sscanf(buf, "%u , %u : USERID :%*[^:]:%255s", &remote, &local, user) == 3 2034 && ntohs(there->sin_port) == remote 2035 && ntohs(here.sin_port) == local) { 2036 2037 /* Strip trailing carriage return. */ 2038 if (cp = strchr(user, '\r')) 2039 *cp = 0; 2040 result = user; 2041 } 2042 2043 alarm(0); 2044 close(s); 2045 return (result); 2046 } 2047 #endif 2048
Indexes created Fri Sep 26 08:10:20 GMT 2025