inetd.c revision 1.23
1 /* $NetBSD: inetd.c,v 1.23 1997/03/13 17:22:23 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 1.23 1997/03/13 17:22:23 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 dofork = (sep->se_bi == 0 || sep->se_bi->bi_fork); 507 if (dofork) { 508 if (sep->se_count++ == 0) 509 (void)gettimeofday(&sep->se_time, 510 (struct timezone *)0); 511 else if (sep->se_count >= sep->se_max) { 512 struct timeval now; 513 514 (void)gettimeofday(&now, (struct timezone *)0); 515 if (now.tv_sec - sep->se_time.tv_sec > 516 CNT_INTVL) { 517 sep->se_time = now; 518 sep->se_count = 1; 519 } else { 520 syslog(LOG_ERR, 521 "%s/%s server failing (looping), service terminated\n", 522 sep->se_service, sep->se_proto); 523 close_sep(sep); 524 sigsetmask(0L); 525 if (!timingout) { 526 timingout = 1; 527 alarm(RETRYTIME); 528 } 529 continue; 530 } 531 } 532 pid = fork(); 533 } 534 if (pid < 0) { 535 syslog(LOG_ERR, "fork: %m"); 536 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 537 close(ctrl); 538 sigsetmask(0L); 539 sleep(1); 540 continue; 541 } 542 if (pid && sep->se_wait) { 543 sep->se_wait = pid; 544 FD_CLR(sep->se_fd, &allsock); 545 nsock--; 546 } 547 sigsetmask(0L); 548 if (pid == 0) { 549 if (debug && dofork) 550 setsid(); 551 #ifdef LIBWRAP 552 request_init(&req, RQ_DAEMON, sep->se_argv[0] ? 553 sep->se_argv[0] : sep->se_service, RQ_FILE, ctrl, 554 NULL); 555 fromhost(&req); 556 denied = !hosts_access(&req); 557 if (denied || lflag) { 558 sp = getservbyport(sep->se_ctrladdr_in.sin_port, 559 sep->se_proto); 560 if (sp == NULL) { 561 (void)snprintf(buf, sizeof buf, "%d", 562 ntohs(sep->se_ctrladdr_in.sin_port)); 563 service = buf; 564 } else 565 service = sp->s_name; 566 } 567 if (denied) { 568 syslog(deny_severity, "refused " 569 "connection from %.500s, service %s (%s)", 570 eval_client(&req), service, sep->se_proto); 571 goto reject; 572 } 573 if (lflag) { 574 syslog(allow_severity, 575 "connection from %.500s, service %s (%s)", 576 eval_client(&req), service, sep->se_proto); 577 } 578 #endif /* LIBWRAP */ 579 if (sep->se_bi) 580 (*sep->se_bi->bi_fn)(ctrl, sep); 581 else { 582 if ((pwd = getpwnam(sep->se_user)) == NULL) { 583 syslog(LOG_ERR, 584 "%s/%s: %s: No such user", 585 sep->se_service, sep->se_proto, 586 sep->se_user); 587 goto reject; 588 } 589 if (sep->se_group && 590 (grp = getgrnam(sep->se_group)) == NULL) { 591 syslog(LOG_ERR, 592 "%s/%s: %s: No such group", 593 sep->se_service, sep->se_proto, 594 sep->se_group); 595 goto reject; 596 } 597 if (pwd->pw_uid) { 598 if (sep->se_group) 599 pwd->pw_gid = grp->gr_gid; 600 if (setgid(pwd->pw_gid) < 0) { 601 syslog(LOG_ERR, 602 "%s/%s: can't set gid %d: %m", 603 sep->se_service, 604 sep->se_proto, pwd->pw_gid); 605 goto reject; 606 } 607 (void) initgroups(pwd->pw_name, 608 pwd->pw_gid); 609 if (setuid(pwd->pw_uid) < 0) { 610 syslog(LOG_ERR, 611 "%s/%s: can't set uid %d: %m", 612 sep->se_service, 613 sep->se_proto, pwd->pw_uid); 614 goto reject; 615 } 616 } else if (sep->se_group) { 617 (void) setgid((gid_t)grp->gr_gid); 618 } 619 if (debug) 620 fprintf(stderr, "%d execl %s\n", 621 getpid(), sep->se_server); 622 #ifdef MULOG 623 if (sep->se_log) 624 dolog(sep, ctrl); 625 #endif 626 if (ctrl != 0) { 627 dup2(ctrl, 0); 628 close(ctrl); 629 ctrl = 0; 630 } 631 dup2(0, 1); 632 dup2(0, 2); 633 #ifdef RLIMIT_NOFILE 634 if (rlim_ofile.rlim_cur != rlim_ofile_cur) { 635 if (setrlimit(RLIMIT_NOFILE, 636 &rlim_ofile) < 0) 637 syslog(LOG_ERR, 638 "setrlimit: %m"); 639 } 640 #endif 641 for (tmpint = rlim_ofile_cur-1; --tmpint > 2; ) 642 (void)close(tmpint); 643 execv(sep->se_server, sep->se_argv); 644 syslog(LOG_ERR, 645 "cannot execute %s: %m", sep->se_server); 646 reject: 647 if (sep->se_socktype != SOCK_STREAM) 648 recv(ctrl, buf, sizeof (buf), 0); 649 _exit(1); 650 } 651 } 652 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 653 close(ctrl); 654 } 655 } 656 } 657 } 658 659 void 660 reapchild(signo) 661 int signo; 662 { 663 int status; 664 pid_t pid; 665 struct servtab *sep; 666 667 for (;;) { 668 pid = wait3(&status, WNOHANG, (struct rusage *)0); 669 if (pid <= 0) 670 break; 671 if (debug) 672 fprintf(stderr, "%d reaped, status %#x\n", 673 pid, status); 674 for (sep = servtab; sep; sep = sep->se_next) 675 if (sep->se_wait == pid) { 676 if (WIFEXITED(status) && WEXITSTATUS(status)) 677 syslog(LOG_WARNING, 678 "%s: exit status 0x%x", 679 sep->se_server, WEXITSTATUS(status)); 680 else if (WIFSIGNALED(status)) 681 syslog(LOG_WARNING, 682 "%s: exit signal 0x%x", 683 sep->se_server, WTERMSIG(status)); 684 sep->se_wait = 1; 685 FD_SET(sep->se_fd, &allsock); 686 nsock++; 687 if (debug) 688 fprintf(stderr, "restored %s, fd %d\n", 689 sep->se_service, sep->se_fd); 690 } 691 } 692 } 693 694 void 695 config(signo) 696 int signo; 697 { 698 struct servtab *sep, *cp, **sepp; 699 struct passwd *pwd; 700 long omask; 701 int n; 702 703 if (!setconfig()) { 704 syslog(LOG_ERR, "%s: %m", CONFIG); 705 return; 706 } 707 for (sep = servtab; sep; sep = sep->se_next) 708 sep->se_checked = 0; 709 while (cp = getconfigent()) { 710 for (sep = servtab; sep; sep = sep->se_next) 711 if (strcmp(sep->se_service, cp->se_service) == 0 && 712 strcmp(sep->se_hostaddr, cp->se_hostaddr) == 0 && 713 strcmp(sep->se_proto, cp->se_proto) == 0 && 714 ISMUX(sep) == ISMUX(cp)) 715 break; 716 if (sep != 0) { 717 int i; 718 719 #define SWAP(type, a, b) {type c=(type)a; (type)a=(type)b; (type)b=(type)c;} 720 721 omask = sigblock(SIGBLOCK); 722 /* 723 * sep->se_wait may be holding the pid of a daemon 724 * that we're waiting for. If so, don't overwrite 725 * it unless the config file explicitly says don't 726 * wait. 727 */ 728 if (cp->se_bi == 0 && 729 (sep->se_wait == 1 || cp->se_wait == 0)) 730 sep->se_wait = cp->se_wait; 731 SWAP(int, cp->se_max, sep->se_max); 732 SWAP(char *, sep->se_user, cp->se_user); 733 SWAP(char *, sep->se_group, cp->se_group); 734 SWAP(char *, sep->se_server, cp->se_server); 735 for (i = 0; i < MAXARGV; i++) 736 SWAP(char *, sep->se_argv[i], cp->se_argv[i]); 737 #undef SWAP 738 if (isrpcservice(sep)) 739 unregister_rpc(sep); 740 sep->se_rpcversl = cp->se_rpcversl; 741 sep->se_rpcversh = cp->se_rpcversh; 742 sigsetmask(omask); 743 freeconfig(cp); 744 if (debug) 745 print_service("REDO", sep); 746 } else { 747 sep = enter(cp); 748 if (debug) 749 print_service("ADD ", sep); 750 } 751 sep->se_checked = 1; 752 753 switch (sep->se_family) { 754 case AF_UNIX: 755 if (sep->se_fd != -1) 756 break; 757 (void)unlink(sep->se_service); 758 n = strlen(sep->se_service); 759 if (n > sizeof(sep->se_ctrladdr_un.sun_path) - 1) 760 n = sizeof(sep->se_ctrladdr_un.sun_path) - 1; 761 strncpy(sep->se_ctrladdr_un.sun_path, 762 sep->se_service, n); 763 sep->se_ctrladdr_un.sun_family = AF_UNIX; 764 sep->se_ctrladdr_size = n + 765 sizeof(sep->se_ctrladdr_un) - 766 sizeof(sep->se_ctrladdr_un.sun_path); 767 if (!ISMUX(sep)) 768 setup(sep); 769 break; 770 case AF_INET: 771 sep->se_ctrladdr_in.sin_family = AF_INET; 772 if (!strcmp(sep->se_hostaddr,"*")) 773 sep->se_ctrladdr_in.sin_addr.s_addr = 774 INADDR_ANY; 775 else if (!inet_aton(sep->se_hostaddr, 776 &sep->se_ctrladdr_in.sin_addr)) { 777 /* Do we really want to support hostname lookups here? */ 778 struct hostent *hp; 779 hp = gethostbyname(sep->se_hostaddr); 780 if (hp == 0) { 781 syslog(LOG_ERR, "%s: unknown host", 782 sep->se_hostaddr); 783 sep->se_checked = 0; 784 continue; 785 } else if (hp->h_addrtype != AF_INET) { 786 syslog(LOG_ERR, 787 "%s: address isn't an Internet address", 788 sep->se_hostaddr); 789 sep->se_checked = 0; 790 continue; 791 } else if (hp->h_length != sizeof(struct in_addr)) { 792 syslog(LOG_ERR, 793 "%s: address size wrong (under DNS corruption attack?)", 794 sep->se_hostaddr); 795 sep->se_checked = 0; 796 continue; 797 } else { 798 memcpy(&sep->se_ctrladdr_in.sin_addr, 799 hp->h_addr_list[0], 800 sizeof(struct in_addr)); 801 } 802 } 803 if (ISMUX(sep)) { 804 sep->se_fd = -1; 805 continue; 806 } 807 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr_in); 808 if (isrpcservice(sep)) { 809 struct rpcent *rp; 810 811 sep->se_rpcprog = atoi(sep->se_service); 812 if (sep->se_rpcprog == 0) { 813 rp = getrpcbyname(sep->se_service); 814 if (rp == 0) { 815 syslog(LOG_ERR, 816 "%s/%s: unknown service", 817 sep->se_service, 818 sep->se_proto); 819 sep->se_checked = 0; 820 continue; 821 } 822 sep->se_rpcprog = rp->r_number; 823 } 824 if (sep->se_fd == -1 && !ISMUX(sep)) 825 setup(sep); 826 if (sep->se_fd != -1) 827 register_rpc(sep); 828 } else { 829 u_short port = htons(atoi(sep->se_service)); 830 831 if (!port) { 832 sp = getservbyname(sep->se_service, 833 sep->se_proto); 834 if (sp == 0) { 835 syslog(LOG_ERR, 836 "%s/%s: unknown service", 837 sep->se_service, 838 sep->se_proto); 839 sep->se_checked = 0; 840 continue; 841 } 842 port = sp->s_port; 843 } 844 if (port != sep->se_ctrladdr_in.sin_port) { 845 sep->se_ctrladdr_in.sin_port = port; 846 if (sep->se_fd >= 0) 847 close_sep(sep); 848 } 849 if (sep->se_fd == -1 && !ISMUX(sep)) 850 setup(sep); 851 } 852 } 853 } 854 endconfig(); 855 /* 856 * Purge anything not looked at above. 857 */ 858 omask = sigblock(SIGBLOCK); 859 sepp = &servtab; 860 while (sep = *sepp) { 861 if (sep->se_checked) { 862 sepp = &sep->se_next; 863 continue; 864 } 865 *sepp = sep->se_next; 866 if (sep->se_fd >= 0) 867 close_sep(sep); 868 if (isrpcservice(sep)) 869 unregister_rpc(sep); 870 if (sep->se_family == AF_UNIX) 871 (void)unlink(sep->se_service); 872 if (debug) 873 print_service("FREE", sep); 874 freeconfig(sep); 875 free((char *)sep); 876 } 877 (void) sigsetmask(omask); 878 } 879 880 void 881 retry(signo) 882 int signo; 883 { 884 struct servtab *sep; 885 886 timingout = 0; 887 for (sep = servtab; sep; sep = sep->se_next) { 888 if (sep->se_fd == -1 && !ISMUX(sep)) { 889 switch (sep->se_family) { 890 case AF_UNIX: 891 case AF_INET: 892 setup(sep); 893 if (sep->se_fd != -1 && isrpcservice(sep)) 894 register_rpc(sep); 895 break; 896 } 897 } 898 } 899 } 900 901 void 902 goaway(signo) 903 int signo; 904 { 905 register struct servtab *sep; 906 907 for (sep = servtab; sep; sep = sep->se_next) { 908 if (sep->se_fd == -1) 909 continue; 910 911 switch (sep->se_family) { 912 case AF_UNIX: 913 (void)unlink(sep->se_service); 914 break; 915 case AF_INET: 916 if (sep->se_wait == 1 && isrpcservice(sep)) 917 unregister_rpc(sep); 918 break; 919 } 920 (void)close(sep->se_fd); 921 } 922 (void)unlink(_PATH_INETDPID); 923 exit(0); 924 } 925 926 void 927 setup(sep) 928 struct servtab *sep; 929 { 930 int on = 1; 931 932 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) { 933 if (debug) 934 fprintf(stderr, "socket failed on %s/%s: %s\n", 935 sep->se_service, sep->se_proto, strerror(errno)); 936 syslog(LOG_ERR, "%s/%s: socket: %m", 937 sep->se_service, sep->se_proto); 938 return; 939 } 940 #define turnon(fd, opt) \ 941 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 942 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 943 turnon(sep->se_fd, SO_DEBUG) < 0) 944 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 945 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 946 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 947 #undef turnon 948 if (bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size) < 0) { 949 if (debug) 950 fprintf(stderr, "bind failed on %s/%s: %s\n", 951 sep->se_service, sep->se_proto, strerror(errno)); 952 syslog(LOG_ERR, "%s/%s: bind: %m", 953 sep->se_service, sep->se_proto); 954 (void) close(sep->se_fd); 955 sep->se_fd = -1; 956 if (!timingout) { 957 timingout = 1; 958 alarm(RETRYTIME); 959 } 960 return; 961 } 962 if (sep->se_socktype == SOCK_STREAM) 963 listen(sep->se_fd, 10); 964 965 FD_SET(sep->se_fd, &allsock); 966 nsock++; 967 if (sep->se_fd > maxsock) { 968 maxsock = sep->se_fd; 969 if (maxsock > rlim_ofile_cur - FD_MARGIN) 970 bump_nofile(); 971 } 972 if (debug) 973 fprintf(stderr, "registered %s on %d\n", 974 sep->se_server, sep->se_fd); 975 } 976 977 /* 978 * Finish with a service and its socket. 979 */ 980 void 981 close_sep(sep) 982 struct servtab *sep; 983 { 984 if (sep->se_fd >= 0) { 985 nsock--; 986 FD_CLR(sep->se_fd, &allsock); 987 (void) close(sep->se_fd); 988 sep->se_fd = -1; 989 } 990 sep->se_count = 0; 991 /* 992 * Don't keep the pid of this running deamon: when reapchild() 993 * reaps this pid, it would erroneously increment nsock. 994 */ 995 if (sep->se_wait > 1) 996 sep->se_wait = 1; 997 } 998 999 register_rpc(sep) 1000 register struct servtab *sep; 1001 { 1002 #ifdef RPC 1003 int n; 1004 struct sockaddr_in sin; 1005 struct protoent *pp; 1006 1007 if ((pp = getprotobyname(sep->se_proto+4)) == NULL) { 1008 syslog(LOG_ERR, "%s: getproto: %m", 1009 sep->se_proto); 1010 return; 1011 } 1012 n = sizeof sin; 1013 if (getsockname(sep->se_fd, (struct sockaddr *)&sin, &n) < 0) { 1014 syslog(LOG_ERR, "%s/%s: getsockname: %m", 1015 sep->se_service, sep->se_proto); 1016 return; 1017 } 1018 1019 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1020 if (debug) 1021 fprintf(stderr, "pmap_set: %u %u %u %u\n", 1022 sep->se_rpcprog, n, pp->p_proto, 1023 ntohs(sin.sin_port)); 1024 (void)pmap_unset(sep->se_rpcprog, n); 1025 if (!pmap_set(sep->se_rpcprog, n, pp->p_proto, ntohs(sin.sin_port))) 1026 syslog(LOG_ERR, "pmap_set: %u %u %u %u: %m", 1027 sep->se_rpcprog, n, pp->p_proto, 1028 ntohs(sin.sin_port)); 1029 } 1030 #endif /* RPC */ 1031 } 1032 1033 unregister_rpc(sep) 1034 register struct servtab *sep; 1035 { 1036 #ifdef RPC 1037 int n; 1038 1039 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1040 if (debug) 1041 fprintf(stderr, "pmap_unset(%u, %u)\n", 1042 sep->se_rpcprog, n); 1043 if (!pmap_unset(sep->se_rpcprog, n)) 1044 syslog(LOG_ERR, "pmap_unset(%u, %u)\n", 1045 sep->se_rpcprog, n); 1046 } 1047 #endif /* RPC */ 1048 } 1049 1050 1051 struct servtab * 1052 enter(cp) 1053 struct servtab *cp; 1054 { 1055 struct servtab *sep; 1056 long omask; 1057 1058 sep = (struct servtab *)malloc(sizeof (*sep)); 1059 if (sep == (struct servtab *)0) { 1060 syslog(LOG_ERR, "Out of memory."); 1061 exit(-1); 1062 } 1063 *sep = *cp; 1064 sep->se_fd = -1; 1065 sep->se_rpcprog = -1; 1066 omask = sigblock(SIGBLOCK); 1067 sep->se_next = servtab; 1068 servtab = sep; 1069 sigsetmask(omask); 1070 return (sep); 1071 } 1072 1073 FILE *fconfig = NULL; 1074 struct servtab serv; 1075 char line[LINE_MAX]; 1076 char *defhost; 1077 1078 int 1079 setconfig() 1080 { 1081 if (defhost) free(defhost); 1082 defhost = newstr("*"); 1083 if (fconfig != NULL) { 1084 fseek(fconfig, 0L, SEEK_SET); 1085 return (1); 1086 } 1087 fconfig = fopen(CONFIG, "r"); 1088 return (fconfig != NULL); 1089 } 1090 1091 void 1092 endconfig() 1093 { 1094 if (fconfig) { 1095 (void) fclose(fconfig); 1096 fconfig = NULL; 1097 } 1098 if (defhost) { 1099 free(defhost); 1100 defhost = 0; 1101 } 1102 } 1103 1104 struct servtab * 1105 getconfigent() 1106 { 1107 struct servtab *sep = &serv; 1108 int argc; 1109 char *cp, *arg; 1110 static char TCPMUX_TOKEN[] = "tcpmux/"; 1111 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) 1112 char *hostdelim; 1113 1114 more: 1115 #ifdef MULOG 1116 while ((cp = nextline(fconfig)) && (*cp == '#' || *cp == '\0')) { 1117 /* Avoid use of `skip' if there is a danger of it looking 1118 * at continuation lines. 1119 */ 1120 do { 1121 cp++; 1122 } while (*cp == ' ' || *cp == '\t'); 1123 if (*cp == '\0') 1124 continue; 1125 if ((arg = skip(&cp)) == NULL) 1126 continue; 1127 if (strcmp(arg, "DOMAIN")) 1128 continue; 1129 if (curdom) 1130 free(curdom); 1131 curdom = NULL; 1132 while (*cp == ' ' || *cp == '\t') 1133 cp++; 1134 if (*cp == '\0') 1135 continue; 1136 arg = cp; 1137 while (*cp && *cp != ' ' && *cp != '\t') 1138 cp++; 1139 if (*cp != '\0') 1140 *cp++ = '\0'; 1141 curdom = newstr(arg); 1142 } 1143 #else 1144 while ((cp = nextline(fconfig)) && (*cp == '#' || *cp == '\0')) 1145 ; 1146 #endif 1147 if (cp == NULL) 1148 return ((struct servtab *)0); 1149 /* 1150 * clear the static buffer, since some fields (se_ctrladdr, 1151 * for example) don't get initialized here. 1152 */ 1153 memset((caddr_t)sep, 0, sizeof *sep); 1154 arg = skip(&cp); 1155 if (cp == NULL) { 1156 /* got an empty line containing just blanks/tabs. */ 1157 goto more; 1158 } 1159 /* Check for a host name. */ 1160 hostdelim = strrchr(arg, ':'); 1161 if (hostdelim) { 1162 *hostdelim = '\0'; 1163 sep->se_hostaddr = newstr(arg); 1164 arg = hostdelim + 1; 1165 /* 1166 * If the line is of the form `host:', then just change the 1167 * default host for the following lines. 1168 */ 1169 if (*arg == '\0') { 1170 arg = skip(&cp); 1171 if (cp == NULL) { 1172 free(defhost); 1173 defhost = sep->se_hostaddr; 1174 goto more; 1175 } 1176 } 1177 } else 1178 sep->se_hostaddr = newstr(defhost); 1179 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1180 char *c = arg + MUX_LEN; 1181 if (*c == '+') { 1182 sep->se_type = MUXPLUS_TYPE; 1183 c++; 1184 } else 1185 sep->se_type = MUX_TYPE; 1186 sep->se_service = newstr(c); 1187 } else { 1188 sep->se_service = newstr(arg); 1189 sep->se_type = NORM_TYPE; 1190 } 1191 1192 arg = sskip(&cp); 1193 if (strcmp(arg, "stream") == 0) 1194 sep->se_socktype = SOCK_STREAM; 1195 else if (strcmp(arg, "dgram") == 0) 1196 sep->se_socktype = SOCK_DGRAM; 1197 else if (strcmp(arg, "rdm") == 0) 1198 sep->se_socktype = SOCK_RDM; 1199 else if (strcmp(arg, "seqpacket") == 0) 1200 sep->se_socktype = SOCK_SEQPACKET; 1201 else if (strcmp(arg, "raw") == 0) 1202 sep->se_socktype = SOCK_RAW; 1203 else 1204 sep->se_socktype = -1; 1205 1206 sep->se_proto = newstr(sskip(&cp)); 1207 if (strcmp(sep->se_proto, "unix") == 0) { 1208 sep->se_family = AF_UNIX; 1209 } else { 1210 sep->se_family = AF_INET; 1211 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1212 #ifdef RPC 1213 char *cp, *ccp; 1214 cp = strchr(sep->se_service, '/'); 1215 if (cp == 0) { 1216 syslog(LOG_ERR, "%s: no rpc version", 1217 sep->se_service); 1218 goto more; 1219 } 1220 *cp++ = '\0'; 1221 sep->se_rpcversl = sep->se_rpcversh = 1222 strtol(cp, &ccp, 0); 1223 if (ccp == cp) { 1224 badafterall: 1225 syslog(LOG_ERR, "%s/%s: bad rpc version", 1226 sep->se_service, cp); 1227 goto more; 1228 } 1229 if (*ccp == '-') { 1230 cp = ccp + 1; 1231 sep->se_rpcversh = strtol(cp, &ccp, 0); 1232 if (ccp == cp) 1233 goto badafterall; 1234 } 1235 #else 1236 syslog(LOG_ERR, "%s: rpc services not suported", 1237 sep->se_service); 1238 goto more; 1239 #endif /* RPC */ 1240 } 1241 } 1242 arg = sskip(&cp); 1243 { 1244 char *cp; 1245 cp = strchr(arg, '.'); 1246 if (cp) { 1247 *cp++ = '\0'; 1248 sep->se_max = atoi(cp); 1249 } else 1250 sep->se_max = TOOMANY; 1251 } 1252 sep->se_wait = strcmp(arg, "wait") == 0; 1253 if (ISMUX(sep)) { 1254 /* 1255 * Silently enforce "nowait" for TCPMUX services since 1256 * they don't have an assigned port to listen on. 1257 */ 1258 sep->se_wait = 0; 1259 1260 if (strcmp(sep->se_proto, "tcp")) { 1261 syslog(LOG_ERR, 1262 "%s: bad protocol for tcpmux service %s", 1263 CONFIG, sep->se_service); 1264 goto more; 1265 } 1266 if (sep->se_socktype != SOCK_STREAM) { 1267 syslog(LOG_ERR, 1268 "%s: bad socket type for tcpmux service %s", 1269 CONFIG, sep->se_service); 1270 goto more; 1271 } 1272 } 1273 sep->se_user = newstr(sskip(&cp)); 1274 if (sep->se_group = strchr(sep->se_user, '.')) 1275 *sep->se_group++ = '\0'; 1276 sep->se_server = newstr(sskip(&cp)); 1277 if (strcmp(sep->se_server, "internal") == 0) { 1278 struct biltin *bi; 1279 1280 for (bi = biltins; bi->bi_service; bi++) 1281 if (bi->bi_socktype == sep->se_socktype && 1282 strcmp(bi->bi_service, sep->se_service) == 0) 1283 break; 1284 if (bi->bi_service == 0) { 1285 syslog(LOG_ERR, "internal service %s unknown", 1286 sep->se_service); 1287 goto more; 1288 } 1289 sep->se_bi = bi; 1290 sep->se_wait = bi->bi_wait; 1291 } else 1292 sep->se_bi = NULL; 1293 argc = 0; 1294 for (arg = skip(&cp); cp; arg = skip(&cp)) { 1295 #if MULOG 1296 char *colon; 1297 1298 if (argc == 0 && (colon = strrchr(arg, ':'))) { 1299 while (arg < colon) { 1300 int x; 1301 char *ccp; 1302 1303 switch (*arg++) { 1304 case 'l': 1305 x = 1; 1306 if (isdigit(*arg)) { 1307 x = strtol(arg, &ccp, 0); 1308 if (ccp == arg) 1309 break; 1310 arg = ccp; 1311 } 1312 sep->se_log &= ~MULOG_RFC931; 1313 sep->se_log |= x; 1314 break; 1315 case 'a': 1316 sep->se_log |= MULOG_RFC931; 1317 break; 1318 default: 1319 break; 1320 } 1321 } 1322 arg = colon + 1; 1323 } 1324 #endif 1325 if (argc < MAXARGV) 1326 sep->se_argv[argc++] = newstr(arg); 1327 } 1328 while (argc <= MAXARGV) 1329 sep->se_argv[argc++] = NULL; 1330 return (sep); 1331 } 1332 1333 void 1334 freeconfig(cp) 1335 struct servtab *cp; 1336 { 1337 int i; 1338 1339 if (cp->se_hostaddr) 1340 free(cp->se_hostaddr); 1341 if (cp->se_service) 1342 free(cp->se_service); 1343 if (cp->se_proto) 1344 free(cp->se_proto); 1345 if (cp->se_user) 1346 free(cp->se_user); 1347 /* Note: se_group is part of the newstr'ed se_user */ 1348 if (cp->se_server) 1349 free(cp->se_server); 1350 for (i = 0; i < MAXARGV; i++) 1351 if (cp->se_argv[i]) 1352 free(cp->se_argv[i]); 1353 } 1354 1355 1356 /* 1357 * Safe skip - if skip returns null, log a syntax error in the 1358 * configuration file and exit. 1359 */ 1360 char * 1361 sskip(cpp) 1362 char **cpp; 1363 { 1364 char *cp; 1365 1366 cp = skip(cpp); 1367 if (cp == NULL) { 1368 syslog(LOG_ERR, "%s: syntax error", CONFIG); 1369 exit(-1); 1370 } 1371 return (cp); 1372 } 1373 1374 char * 1375 skip(cpp) 1376 char **cpp; 1377 { 1378 char *cp = *cpp; 1379 char *start; 1380 1381 if (*cpp == NULL) 1382 return ((char *)0); 1383 1384 again: 1385 while (*cp == ' ' || *cp == '\t') 1386 cp++; 1387 if (*cp == '\0') { 1388 int c; 1389 1390 c = getc(fconfig); 1391 (void) ungetc(c, fconfig); 1392 if (c == ' ' || c == '\t') 1393 if (cp = nextline(fconfig)) 1394 goto again; 1395 *cpp = (char *)0; 1396 return ((char *)0); 1397 } 1398 start = cp; 1399 while (*cp && *cp != ' ' && *cp != '\t') 1400 cp++; 1401 if (*cp != '\0') 1402 *cp++ = '\0'; 1403 *cpp = cp; 1404 return (start); 1405 } 1406 1407 char * 1408 nextline(fd) 1409 FILE *fd; 1410 { 1411 char *cp; 1412 1413 if (fgets(line, sizeof (line), fd) == NULL) 1414 return ((char *)0); 1415 cp = strchr(line, '\n'); 1416 if (cp) 1417 *cp = '\0'; 1418 return (line); 1419 } 1420 1421 char * 1422 newstr(cp) 1423 char *cp; 1424 { 1425 if (cp = strdup(cp ? cp : "")) 1426 return (cp); 1427 syslog(LOG_ERR, "strdup: %m"); 1428 exit(-1); 1429 } 1430 1431 void 1432 inetd_setproctitle(a, s) 1433 char *a; 1434 int s; 1435 { 1436 int size; 1437 char *cp; 1438 struct sockaddr_in sin; 1439 char buf[80]; 1440 1441 cp = Argv[0]; 1442 size = sizeof(sin); 1443 if (getpeername(s, (struct sockaddr *)&sin, &size) == 0) 1444 (void)snprintf(buf, sizeof buf, "-%s [%s]", a, 1445 inet_ntoa(sin.sin_addr)); 1446 else 1447 (void)snprintf(buf, sizeof buf, "-%s", a); 1448 strncpy(cp, buf, LastArg - cp); 1449 cp += strlen(cp); 1450 while (cp < LastArg) 1451 *cp++ = ' '; 1452 } 1453 1454 logpid() 1455 { 1456 FILE *fp; 1457 1458 if ((fp = fopen(_PATH_INETDPID, "w")) != NULL) { 1459 fprintf(fp, "%u\n", getpid()); 1460 (void)fclose(fp); 1461 } 1462 } 1463 1464 bump_nofile() 1465 { 1466 #ifdef RLIMIT_NOFILE 1467 1468 #define FD_CHUNK 32 1469 1470 struct rlimit rl; 1471 1472 if (getrlimit(RLIMIT_NOFILE, &rl) < 0) { 1473 syslog(LOG_ERR, "getrlimit: %m"); 1474 return -1; 1475 } 1476 rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK); 1477 if (rl.rlim_cur <= rlim_ofile_cur) { 1478 syslog(LOG_ERR, 1479 "bump_nofile: cannot extend file limit, max = %d", 1480 rl.rlim_cur); 1481 return -1; 1482 } 1483 1484 if (setrlimit(RLIMIT_NOFILE, &rl) < 0) { 1485 syslog(LOG_ERR, "setrlimit: %m"); 1486 return -1; 1487 } 1488 1489 rlim_ofile_cur = rl.rlim_cur; 1490 return 0; 1491 1492 #else 1493 syslog(LOG_ERR, "bump_nofile: cannot extend file limit"); 1494 return -1; 1495 #endif 1496 } 1497 1498 /* 1499 * Internet services provided internally by inetd: 1500 */ 1501 #define BUFSIZE 4096 1502 1503 /* ARGSUSED */ 1504 void 1505 echo_stream(s, sep) /* Echo service -- echo data back */ 1506 int s; 1507 struct servtab *sep; 1508 { 1509 char buffer[BUFSIZE]; 1510 int i; 1511 1512 inetd_setproctitle(sep->se_service, s); 1513 while ((i = read(s, buffer, sizeof(buffer))) > 0 && 1514 write(s, buffer, i) > 0) 1515 ; 1516 exit(0); 1517 } 1518 1519 /* ARGSUSED */ 1520 void 1521 echo_dg(s, sep) /* Echo service -- echo data back */ 1522 int s; 1523 struct servtab *sep; 1524 { 1525 char buffer[BUFSIZE]; 1526 int i, size; 1527 struct sockaddr sa; 1528 1529 size = sizeof(sa); 1530 if ((i = recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size)) < 0) 1531 return; 1532 (void) sendto(s, buffer, i, 0, &sa, sizeof(sa)); 1533 } 1534 1535 /* ARGSUSED */ 1536 void 1537 discard_stream(s, sep) /* Discard service -- ignore data */ 1538 int s; 1539 struct servtab *sep; 1540 { 1541 char buffer[BUFSIZE]; 1542 1543 inetd_setproctitle(sep->se_service, s); 1544 while ((errno = 0, read(s, buffer, sizeof(buffer)) > 0) || 1545 errno == EINTR) 1546 ; 1547 exit(0); 1548 } 1549 1550 /* ARGSUSED */ 1551 void 1552 discard_dg(s, sep) /* Discard service -- ignore data */ 1553 int s; 1554 struct servtab *sep; 1555 { 1556 char buffer[BUFSIZE]; 1557 1558 (void) read(s, buffer, sizeof(buffer)); 1559 } 1560 1561 #include <ctype.h> 1562 #define LINESIZ 72 1563 char ring[128]; 1564 char *endring; 1565 1566 void 1567 initring() 1568 { 1569 int i; 1570 1571 endring = ring; 1572 1573 for (i = 0; i <= 128; ++i) 1574 if (isprint(i)) 1575 *endring++ = i; 1576 } 1577 1578 /* ARGSUSED */ 1579 void 1580 chargen_stream(s, sep) /* Character generator */ 1581 int s; 1582 struct servtab *sep; 1583 { 1584 int len; 1585 char *rs, text[LINESIZ+2]; 1586 1587 inetd_setproctitle(sep->se_service, s); 1588 1589 if (!endring) { 1590 initring(); 1591 rs = ring; 1592 } 1593 1594 text[LINESIZ] = '\r'; 1595 text[LINESIZ + 1] = '\n'; 1596 for (rs = ring;;) { 1597 if ((len = endring - rs) >= LINESIZ) 1598 memmove(text, rs, LINESIZ); 1599 else { 1600 memmove(text, rs, len); 1601 memmove(text + len, ring, LINESIZ - len); 1602 } 1603 if (++rs == endring) 1604 rs = ring; 1605 if (write(s, text, sizeof(text)) != sizeof(text)) 1606 break; 1607 } 1608 exit(0); 1609 } 1610 1611 /* ARGSUSED */ 1612 void 1613 chargen_dg(s, sep) /* Character generator */ 1614 int s; 1615 struct servtab *sep; 1616 { 1617 struct sockaddr sa; 1618 static char *rs; 1619 int len, size; 1620 char text[LINESIZ+2]; 1621 1622 if (endring == 0) { 1623 initring(); 1624 rs = ring; 1625 } 1626 1627 size = sizeof(sa); 1628 if (recvfrom(s, text, sizeof(text), 0, &sa, &size) < 0) 1629 return; 1630 1631 if ((len = endring - rs) >= LINESIZ) 1632 memmove(text, rs, LINESIZ); 1633 else { 1634 memmove(text, rs, len); 1635 memmove(text + len, ring, LINESIZ - len); 1636 } 1637 if (++rs == endring) 1638 rs = ring; 1639 text[LINESIZ] = '\r'; 1640 text[LINESIZ + 1] = '\n'; 1641 (void) sendto(s, text, sizeof(text), 0, &sa, sizeof(sa)); 1642 } 1643 1644 /* 1645 * Return a machine readable date and time, in the form of the 1646 * number of seconds since midnight, Jan 1, 1900. Since gettimeofday 1647 * returns the number of seconds since midnight, Jan 1, 1970, 1648 * we must add 2208988800 seconds to this figure to make up for 1649 * some seventy years Bell Labs was asleep. 1650 */ 1651 1652 long 1653 machtime() 1654 { 1655 struct timeval tv; 1656 1657 if (gettimeofday(&tv, (struct timezone *)0) < 0) { 1658 if (debug) 1659 fprintf(stderr, "Unable to get time of day\n"); 1660 return (0L); 1661 } 1662 #define OFFSET ((u_long)25567 * 24*60*60) 1663 return (htonl((long)(tv.tv_sec + OFFSET))); 1664 #undef OFFSET 1665 } 1666 1667 /* ARGSUSED */ 1668 void 1669 machtime_stream(s, sep) 1670 int s; 1671 struct servtab *sep; 1672 { 1673 long result; 1674 1675 result = machtime(); 1676 (void) write(s, (char *) &result, sizeof(result)); 1677 } 1678 1679 /* ARGSUSED */ 1680 void 1681 machtime_dg(s, sep) 1682 int s; 1683 struct servtab *sep; 1684 { 1685 long result; 1686 struct sockaddr sa; 1687 int size; 1688 1689 size = sizeof(sa); 1690 if (recvfrom(s, (char *)&result, sizeof(result), 0, &sa, &size) < 0) 1691 return; 1692 result = machtime(); 1693 (void) sendto(s, (char *) &result, sizeof(result), 0, &sa, sizeof(sa)); 1694 } 1695 1696 /* ARGSUSED */ 1697 void 1698 daytime_stream(s, sep) /* Return human-readable time of day */ 1699 int s; 1700 struct servtab *sep; 1701 { 1702 char buffer[256]; 1703 time_t clock; 1704 int len; 1705 1706 clock = time((time_t *) 0); 1707 1708 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 1709 (void) write(s, buffer, len); 1710 } 1711 1712 /* ARGSUSED */ 1713 void 1714 daytime_dg(s, sep) /* Return human-readable time of day */ 1715 int s; 1716 struct servtab *sep; 1717 { 1718 char buffer[256]; 1719 time_t clock; 1720 struct sockaddr sa; 1721 int size, len; 1722 1723 clock = time((time_t *) 0); 1724 1725 size = sizeof(sa); 1726 if (recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size) < 0) 1727 return; 1728 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 1729 (void) sendto(s, buffer, len, 0, &sa, sizeof(sa)); 1730 } 1731 1732 /* 1733 * print_service: 1734 * Dump relevant information to stderr 1735 */ 1736 void 1737 print_service(action, sep) 1738 char *action; 1739 struct servtab *sep; 1740 { 1741 if (isrpcservice(sep)) 1742 fprintf(stderr, 1743 "%s: %s rpcprog=%d, rpcvers = %d/%d, proto=%s, wait.max=%d.%d, user.group=%s.%s builtin=%lx server=%s\n", 1744 action, sep->se_service, 1745 sep->se_rpcprog, sep->se_rpcversh, sep->se_rpcversl, sep->se_proto, 1746 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 1747 (long)sep->se_bi, sep->se_server); 1748 else 1749 fprintf(stderr, 1750 "%s: %s proto=%s, wait.max=%d.%d, user.group=%s.%s builtin=%lx server=%s\n", 1751 action, sep->se_service, sep->se_proto, 1752 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 1753 (long)sep->se_bi, sep->se_server); 1754 } 1755 1756 void 1757 usage() 1758 { 1759 1760 #ifdef LIBWRAP 1761 (void)fprintf(stderr, "usage: %s [-dl] [conf]\n", __progname); 1762 #else 1763 (void)fprintf(stderr, "usage: %s [-d] [conf]\n", __progname); 1764 #endif 1765 exit(1); 1766 } 1767 1768 1769 /* 1770 * Based on TCPMUX.C by Mark K. Lottor November 1988 1771 * sri-nic::ps:<mkl>tcpmux.c 1772 */ 1773 1774 static int /* # of characters upto \r,\n or \0 */ 1775 getline(fd, buf, len) 1776 int fd; 1777 char *buf; 1778 int len; 1779 { 1780 int count = 0, n; 1781 1782 do { 1783 n = read(fd, buf, len-count); 1784 if (n == 0) 1785 return (count); 1786 if (n < 0) 1787 return (-1); 1788 while (--n >= 0) { 1789 if (*buf == '\r' || *buf == '\n' || *buf == '\0') 1790 return (count); 1791 count++; 1792 buf++; 1793 } 1794 } while (count < len); 1795 return (count); 1796 } 1797 1798 #define MAX_SERV_LEN (256+2) /* 2 bytes for \r\n */ 1799 1800 #define strwrite(fd, buf) (void) write(fd, buf, sizeof(buf)-1) 1801 1802 struct servtab * 1803 tcpmux(s) 1804 int s; 1805 { 1806 struct servtab *sep; 1807 char service[MAX_SERV_LEN+1]; 1808 int len; 1809 1810 /* Get requested service name */ 1811 if ((len = getline(s, service, MAX_SERV_LEN)) < 0) { 1812 strwrite(s, "-Error reading service name\r\n"); 1813 return (NULL); 1814 } 1815 service[len] = '\0'; 1816 1817 if (debug) 1818 fprintf(stderr, "tcpmux: someone wants %s\n", service); 1819 1820 /* 1821 * Help is a required command, and lists available services, 1822 * one per line. 1823 */ 1824 if (!strcasecmp(service, "help")) { 1825 for (sep = servtab; sep; sep = sep->se_next) { 1826 if (!ISMUX(sep)) 1827 continue; 1828 (void)write(s,sep->se_service,strlen(sep->se_service)); 1829 strwrite(s, "\r\n"); 1830 } 1831 return (NULL); 1832 } 1833 1834 /* Try matching a service in inetd.conf with the request */ 1835 for (sep = servtab; sep; sep = sep->se_next) { 1836 if (!ISMUX(sep)) 1837 continue; 1838 if (!strcasecmp(service, sep->se_service)) { 1839 if (ISMUXPLUS(sep)) { 1840 strwrite(s, "+Go\r\n"); 1841 } 1842 return (sep); 1843 } 1844 } 1845 strwrite(s, "-Service not available\r\n"); 1846 return (NULL); 1847 } 1848 1849 1850 #ifdef MULOG 1851 dolog(sep, ctrl) 1852 struct servtab *sep; 1853 int ctrl; 1854 { 1855 struct sockaddr sa; 1856 struct sockaddr_in *sin = (struct sockaddr_in *)&sa; 1857 int len = sizeof(sa); 1858 struct hostent *hp; 1859 char *host, *dp, buf[BUFSIZ], *rfc931_name(); 1860 int connected = 1; 1861 1862 if (sep->se_family != AF_INET) 1863 return; 1864 1865 if (getpeername(ctrl, &sa, &len) < 0) { 1866 if (errno != ENOTCONN) { 1867 syslog(LOG_ERR, "getpeername: %m"); 1868 return; 1869 } 1870 if (recvfrom(ctrl, buf, sizeof(buf), MSG_PEEK, &sa, &len) < 0) { 1871 syslog(LOG_ERR, "recvfrom: %m"); 1872 return; 1873 } 1874 connected = 0; 1875 } 1876 if (sa.sa_family != AF_INET) { 1877 syslog(LOG_ERR, "unexpected address family %u", sa.sa_family); 1878 return; 1879 } 1880 1881 hp = gethostbyaddr((char *) &sin->sin_addr.s_addr, 1882 sizeof (sin->sin_addr.s_addr), AF_INET); 1883 1884 host = hp?hp->h_name:inet_ntoa(sin->sin_addr); 1885 1886 switch (sep->se_log & ~MULOG_RFC931) { 1887 case 0: 1888 return; 1889 case 1: 1890 if (curdom == NULL || *curdom == '\0') 1891 break; 1892 dp = host + strlen(host) - strlen(curdom); 1893 if (dp < host) 1894 break; 1895 if (debug) 1896 fprintf(stderr, "check \"%s\" against curdom \"%s\"\n", 1897 host, curdom); 1898 if (strcasecmp(dp, curdom) == 0) 1899 return; 1900 break; 1901 case 2: 1902 default: 1903 break; 1904 } 1905 1906 openlog("", LOG_NOWAIT, MULOG); 1907 1908 if (connected && (sep->se_log & MULOG_RFC931)) 1909 syslog(LOG_INFO, "%s@%s wants %s", 1910 rfc931_name(sin, ctrl), host, sep->se_service); 1911 else 1912 syslog(LOG_INFO, "%s wants %s", 1913 host, sep->se_service); 1914 } 1915 1916 /* 1917 * From tcp_log by 1918 * Wietse Venema, Eindhoven University of Technology, The Netherlands. 1919 */ 1920 #if 0 1921 static char sccsid[] = "@(#) rfc931.c 1.3 92/08/31 22:54:46"; 1922 #endif 1923 1924 #include <setjmp.h> 1925 1926 #define RFC931_PORT 113 /* Semi-well-known port */ 1927 #define TIMEOUT 4 1928 #define TIMEOUT2 10 1929 1930 static jmp_buf timebuf; 1931 1932 /* timeout - handle timeouts */ 1933 1934 static void timeout(sig) 1935 int sig; 1936 { 1937 longjmp(timebuf, sig); 1938 } 1939 1940 /* rfc931_name - return remote user name */ 1941 1942 char * 1943 rfc931_name(there, ctrl) 1944 struct sockaddr_in *there; /* remote link information */ 1945 int ctrl; 1946 { 1947 struct sockaddr_in here; /* local link information */ 1948 struct sockaddr_in sin; /* for talking to RFC931 daemon */ 1949 int length; 1950 int s; 1951 unsigned remote; 1952 unsigned local; 1953 static char user[256]; /* XXX */ 1954 char buf[256]; 1955 char *cp; 1956 char *result = "USER_UNKNOWN"; 1957 int len; 1958 1959 /* Find out local port number of our stdin. */ 1960 1961 length = sizeof(here); 1962 if (getsockname(ctrl, (struct sockaddr *) &here, &length) == -1) { 1963 syslog(LOG_ERR, "getsockname: %m"); 1964 return (result); 1965 } 1966 /* Set up timer so we won't get stuck. */ 1967 1968 if ((s = socket(AF_INET, SOCK_STREAM, 0)) == -1) { 1969 syslog(LOG_ERR, "socket: %m"); 1970 return (result); 1971 } 1972 1973 sin = here; 1974 sin.sin_port = htons(0); 1975 if (bind(s, (struct sockaddr *) &sin, sizeof(sin)) == -1) { 1976 syslog(LOG_ERR, "bind: %m"); 1977 return (result); 1978 } 1979 1980 signal(SIGALRM, timeout); 1981 if (setjmp(timebuf)) { 1982 close(s); /* not: fclose(fp) */ 1983 return (result); 1984 } 1985 alarm(TIMEOUT); 1986 1987 /* Connect to the RFC931 daemon. */ 1988 1989 sin = *there; 1990 sin.sin_port = htons(RFC931_PORT); 1991 if (connect(s, (struct sockaddr *) &sin, sizeof(sin)) == -1) { 1992 close(s); 1993 alarm(0); 1994 return (result); 1995 } 1996 1997 /* Query the RFC 931 server. Would 13-byte writes ever be broken up? */ 1998 (void)snprintf(buf, sizeof buf, "%u,%u\r\n", ntohs(there->sin_port), 1999 ntohs(here.sin_port)); 2000 2001 2002 for (len = 0, cp = buf; len < strlen(buf); ) { 2003 int n; 2004 2005 if ((n = write(s, cp, strlen(buf) - len)) == -1) { 2006 close(s); 2007 alarm(0); 2008 return (result); 2009 } 2010 cp += n; 2011 len += n; 2012 } 2013 2014 /* Read response */ 2015 for (cp = buf; cp < buf + sizeof(buf) - 1; ) { 2016 char c; 2017 if (read(s, &c, 1) != 1) { 2018 close(s); 2019 alarm(0); 2020 return (result); 2021 } 2022 if (c == '\n') 2023 break; 2024 *cp++ = c; 2025 } 2026 *cp = '\0'; 2027 2028 if (sscanf(buf, "%u , %u : USERID :%*[^:]:%255s", &remote, &local, user) == 3 2029 && ntohs(there->sin_port) == remote 2030 && ntohs(here.sin_port) == local) { 2031 2032 /* Strip trailing carriage return. */ 2033 if (cp = strchr(user, '\r')) 2034 *cp = 0; 2035 result = user; 2036 } 2037 2038 alarm(0); 2039 close(s); 2040 return (result); 2041 } 2042 #endif 2043
Indexes created Fri Sep 26 20:09:58 GMT 2025