inetd.c revision 1.38.2.2
1 /* $NetBSD: inetd.c,v 1.38.2.2 1998/05/05 08:12:06 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 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT("@(#) Copyright (c) 1983, 1991, 1993, 1994\n\ 39 The Regents of the University of California. All rights reserved.\n"); 40 #if 0 41 static char sccsid[] = "@(#)inetd.c 8.4 (Berkeley) 4/13/94"; 42 #else 43 __RCSID("$NetBSD: inetd.c,v 1.38.2.2 1998/05/05 08:12:06 mycroft Exp $"); 44 #endif 45 #endif /* not lint */ 46 47 /* 48 * Inetd - Internet super-server 49 * 50 * This program invokes all internet services as needed. Connection-oriented 51 * services are invoked each time a connection is made, by creating a process. 52 * This process is passed the connection as file descriptor 0 and is expected 53 * to do a getpeername to find out the source host and port. 54 * 55 * Datagram oriented services are invoked when a datagram 56 * arrives; a process is created and passed a pending message 57 * on file descriptor 0. Datagram servers may either connect 58 * to their peer, freeing up the original socket for inetd 59 * to receive further messages on, or ``take over the socket'', 60 * processing all arriving datagrams and, eventually, timing 61 * out. The first type of server is said to be ``multi-threaded''; 62 * the second type of server ``single-threaded''. 63 * 64 * Inetd uses a configuration file which is read at startup 65 * and, possibly, at some later time in response to a hangup signal. 66 * The configuration file is ``free format'' with fields given in the 67 * order shown below. Continuation lines for an entry must being with 68 * a space or tab. All fields must be present in each entry. 69 * 70 * service name must be in /etc/services or must 71 * name a tcpmux service 72 * socket type stream/dgram/raw/rdm/seqpacket 73 * protocol must be in /etc/protocols 74 * wait/nowait[.max] single-threaded/multi-threaded, max # 75 * user[.group] user/group to run daemon as 76 * server program full path name 77 * server program arguments maximum of MAXARGS (20) 78 * 79 * For RPC services 80 * service name/version must be in /etc/rpc 81 * socket type stream/dgram/raw/rdm/seqpacket 82 * protocol must be in /etc/protocols 83 * wait/nowait[.max] single-threaded/multi-threaded 84 * user[.group] user to run daemon as 85 * server program full path name 86 * server program arguments maximum of MAXARGS (20) 87 * 88 * For non-RPC services, the "service name" can be of the form 89 * hostaddress:servicename, in which case the hostaddress is used 90 * as the host portion of the address to listen on. If hostaddress 91 * consists of a single `*' character, INADDR_ANY is used. 92 * 93 * A line can also consist of just 94 * hostaddress: 95 * where hostaddress is as in the preceding paragraph. Such a line must 96 * have no further fields; the specified hostaddress is remembered and 97 * used for all further lines that have no hostaddress specified, 98 * until the next such line (or EOF). (This is why * is provided to 99 * allow explicit specification of INADDR_ANY.) A line 100 * *: 101 * is implicitly in effect at the beginning of the file. 102 * 103 * The hostaddress specifier may (and often will) contain dots; 104 * the service name must not. 105 * 106 * For RPC services, host-address specifiers are accepted and will 107 * work to some extent; however, because of limitations in the 108 * portmapper interface, it will not work to try to give more than 109 * one line for any given RPC service, even if the host-address 110 * specifiers are different. 111 * 112 * TCP services without official port numbers are handled with the 113 * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for 114 * requests. When a connection is made from a foreign host, the service 115 * requested is passed to tcpmux, which looks it up in the servtab list 116 * and returns the proper entry for the service. Tcpmux returns a 117 * negative reply if the service doesn't exist, otherwise the invoked 118 * server is expected to return the positive reply if the service type in 119 * inetd.conf file has the prefix "tcpmux/". If the service type has the 120 * prefix "tcpmux/+", tcpmux will return the positive reply for the 121 * process; this is for compatibility with older server code, and also 122 * allows you to invoke programs that use stdin/stdout without putting any 123 * special server code in them. Services that use tcpmux are "nowait" 124 * because they do not have a well-known port and hence cannot listen 125 * for new requests. 126 * 127 * Comment lines are indicated by a `#' in column 1. 128 */ 129 130 /* 131 * Here's the scoop concerning the user.group feature: 132 * 133 * 1) set-group-option off. 134 * 135 * a) user = root: NO setuid() or setgid() is done 136 * 137 * b) other: setuid() 138 * setgid(primary group as found in passwd) 139 * initgroups(name, primary group) 140 * 141 * 2) set-group-option on. 142 * 143 * a) user = root: NO setuid() 144 * setgid(specified group) 145 * NO initgroups() 146 * 147 * b) other: setuid() 148 * setgid(specified group) 149 * initgroups(name, specified group) 150 * 151 */ 152 153 #include <sys/param.h> 154 #include <sys/stat.h> 155 #include <sys/ioctl.h> 156 #include <sys/socket.h> 157 #include <sys/un.h> 158 #include <sys/wait.h> 159 #include <sys/time.h> 160 #include <sys/resource.h> 161 162 #ifndef RLIMIT_NOFILE 163 #define RLIMIT_NOFILE RLIMIT_OFILE 164 #endif 165 166 #define RPC 167 168 #include <netinet/in.h> 169 #include <arpa/inet.h> 170 #ifdef RPC 171 #include <rpc/rpc.h> 172 #include <rpc/pmap_clnt.h> 173 #endif 174 175 #include <errno.h> 176 #include <fcntl.h> 177 #include <grp.h> 178 #include <netdb.h> 179 #include <pwd.h> 180 #include <signal.h> 181 #include <stdio.h> 182 #include <stdlib.h> 183 #include <string.h> 184 #include <syslog.h> 185 #include <unistd.h> 186 187 #include "pathnames.h" 188 189 #ifdef LIBWRAP 190 # include <tcpd.h> 191 #ifndef LIBWRAP_ALLOW_FACILITY 192 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH 193 #endif 194 #ifndef LIBWRAP_ALLOW_SEVERITY 195 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO 196 #endif 197 #ifndef LIBWRAP_DENY_FACILITY 198 # define LIBWRAP_DENY_FACILITY LOG_AUTH 199 #endif 200 #ifndef LIBWRAP_DENY_SEVERITY 201 # define LIBWRAP_DENY_SEVERITY LOG_WARNING 202 #endif 203 int allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY; 204 int deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY; 205 #endif 206 207 #define TOOMANY 40 /* don't start more than TOOMANY */ 208 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */ 209 #define RETRYTIME (60*10) /* retry after bind or server fail */ 210 211 #define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM)) 212 213 int debug; 214 #ifdef LIBWRAP 215 int lflag; 216 #endif 217 int nsock, maxsock; 218 fd_set allsock; 219 int options; 220 int timingout; 221 struct servent *sp; 222 char *curdom; 223 224 #ifndef OPEN_MAX 225 #define OPEN_MAX 64 226 #endif 227 228 /* Reserve some descriptors, 3 stdio + at least: 1 log, 1 conf. file */ 229 #define FD_MARGIN (8) 230 typeof(((struct rlimit *)0)->rlim_cur) rlim_ofile_cur = OPEN_MAX; 231 232 #ifdef RLIMIT_NOFILE 233 struct rlimit rlim_ofile; 234 #endif 235 236 struct servtab { 237 char *se_hostaddr; /* host address to listen on */ 238 char *se_service; /* name of service */ 239 int se_socktype; /* type of socket to use */ 240 int se_family; /* address family */ 241 char *se_proto; /* protocol used */ 242 int se_rpcprog; /* rpc program number */ 243 int se_rpcversl; /* rpc program lowest version */ 244 int se_rpcversh; /* rpc program highest version */ 245 #define isrpcservice(sep) ((sep)->se_rpcversl != 0) 246 short se_wait; /* single threaded server */ 247 short se_checked; /* looked at during merge */ 248 char *se_user; /* user name to run as */ 249 char *se_group; /* group name to run as */ 250 struct biltin *se_bi; /* if built-in, description */ 251 char *se_server; /* server program */ 252 #define MAXARGV 20 253 char *se_argv[MAXARGV+1]; /* program arguments */ 254 int se_fd; /* open descriptor */ 255 int se_type; /* type */ 256 union { 257 struct sockaddr se_un_ctrladdr; 258 struct sockaddr_in se_un_ctrladdr_in; 259 struct sockaddr_un se_un_ctrladdr_un; 260 } se_un; /* bound address */ 261 #define se_ctrladdr se_un.se_un_ctrladdr 262 #define se_ctrladdr_in se_un.se_un_ctrladdr_in 263 #define se_ctrladdr_un se_un.se_un_ctrladdr_un 264 int se_ctrladdr_size; 265 int se_max; /* max # of instances of this service */ 266 int se_count; /* number started since se_time */ 267 struct timeval se_time; /* start of se_count */ 268 #ifdef MULOG 269 int se_log; 270 #define MULOG_RFC931 0x40000000 271 #endif 272 struct servtab *se_next; 273 } *servtab; 274 275 #define NORM_TYPE 0 276 #define MUX_TYPE 1 277 #define MUXPLUS_TYPE 2 278 #define ISMUX(sep) (((sep)->se_type == MUX_TYPE) || \ 279 ((sep)->se_type == MUXPLUS_TYPE)) 280 #define ISMUXPLUS(sep) ((sep)->se_type == MUXPLUS_TYPE) 281 282 283 void chargen_dg __P((int, struct servtab *)); 284 void chargen_stream __P((int, struct servtab *)); 285 void close_sep __P((struct servtab *)); 286 void config __P((int)); 287 void daytime_dg __P((int, struct servtab *)); 288 void daytime_stream __P((int, struct servtab *)); 289 void discard_dg __P((int, struct servtab *)); 290 void discard_stream __P((int, struct servtab *)); 291 void echo_dg __P((int, struct servtab *)); 292 void echo_stream __P((int, struct servtab *)); 293 void endconfig __P((void)); 294 struct servtab *enter __P((struct servtab *)); 295 void freeconfig __P((struct servtab *)); 296 struct servtab *getconfigent __P((void)); 297 void goaway __P((int)); 298 void machtime_dg __P((int, struct servtab *)); 299 void machtime_stream __P((int, struct servtab *)); 300 char *newstr __P((char *)); 301 char *nextline __P((FILE *)); 302 void print_service __P((char *, struct servtab *)); 303 void reapchild __P((int)); 304 void retry __P((int)); 305 void run_service __P((int, struct servtab *)); 306 int setconfig __P((void)); 307 void setup __P((struct servtab *)); 308 char *sskip __P((char **)); 309 char *skip __P((char **)); 310 void tcpmux __P((int, struct servtab *)); 311 void usage __P((void)); 312 void logpid __P((void)); 313 void register_rpc __P((struct servtab *sep)); 314 void unregister_rpc __P((struct servtab *sep)); 315 void bump_nofile __P((void)); 316 void inetd_setproctitle __P((char *, int)); 317 void initring __P((void)); 318 long machtime __P((void)); 319 static int getline __P((int, char *, int)); 320 int main __P((int, char *[], char *[])); 321 322 struct biltin { 323 char *bi_service; /* internally provided service name */ 324 int bi_socktype; /* type of socket supported */ 325 short bi_fork; /* 1 if should fork before call */ 326 short bi_wait; /* 1 if should wait for child */ 327 void (*bi_fn) __P((int, struct servtab *)); 328 /* function which performs it */ 329 } biltins[] = { 330 /* Echo received data */ 331 { "echo", SOCK_STREAM, 1, 0, echo_stream }, 332 { "echo", SOCK_DGRAM, 0, 0, echo_dg }, 333 334 /* Internet /dev/null */ 335 { "discard", SOCK_STREAM, 1, 0, discard_stream }, 336 { "discard", SOCK_DGRAM, 0, 0, discard_dg }, 337 338 /* Return 32 bit time since 1970 */ 339 { "time", SOCK_STREAM, 0, 0, machtime_stream }, 340 { "time", SOCK_DGRAM, 0, 0, machtime_dg }, 341 342 /* Return human-readable time */ 343 { "daytime", SOCK_STREAM, 0, 0, daytime_stream }, 344 { "daytime", SOCK_DGRAM, 0, 0, daytime_dg }, 345 346 /* Familiar character generator */ 347 { "chargen", SOCK_STREAM, 1, 0, chargen_stream }, 348 { "chargen", SOCK_DGRAM, 0, 0, chargen_dg }, 349 350 { "tcpmux", SOCK_STREAM, 1, 0, tcpmux }, 351 352 { NULL } 353 }; 354 355 #define NUMINT (sizeof(intab) / sizeof(struct inent)) 356 char *CONFIG = _PATH_INETDCONF; 357 char **Argv; 358 char *LastArg; 359 extern char *__progname; 360 361 #ifdef sun 362 /* 363 * Sun's RPC library caches the result of `dtablesize()' 364 * This is incompatible with our "bumping" of file descriptors "on demand" 365 */ 366 int 367 _rpc_dtablesize() 368 { 369 return rlim_ofile_cur; 370 } 371 #endif 372 373 int 374 main(argc, argv, envp) 375 int argc; 376 char *argv[], *envp[]; 377 { 378 struct servtab *sep, *nsep; 379 struct sigvec sv; 380 int ch, dofork; 381 pid_t pid; 382 383 Argv = argv; 384 if (envp == 0 || *envp == 0) 385 envp = argv; 386 while (*envp) 387 envp++; 388 LastArg = envp[-1] + strlen(envp[-1]); 389 390 while ((ch = getopt(argc, argv, 391 #ifdef LIBWRAP 392 "dl" 393 #else 394 "d" 395 #endif 396 )) != -1) 397 switch(ch) { 398 case 'd': 399 debug = 1; 400 options |= SO_DEBUG; 401 break; 402 #ifdef LIBWRAP 403 case 'l': 404 lflag = 1; 405 break; 406 #endif 407 case '?': 408 default: 409 usage(); 410 } 411 argc -= optind; 412 argv += optind; 413 414 if (argc > 0) 415 CONFIG = argv[0]; 416 417 if (debug == 0) 418 daemon(0, 0); 419 openlog(__progname, LOG_PID | LOG_NOWAIT, LOG_DAEMON); 420 logpid(); 421 422 #ifdef RLIMIT_NOFILE 423 if (getrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) { 424 syslog(LOG_ERR, "getrlimit: %m"); 425 } else { 426 rlim_ofile_cur = rlim_ofile.rlim_cur; 427 if (rlim_ofile_cur == RLIM_INFINITY) /* ! */ 428 rlim_ofile_cur = OPEN_MAX; 429 } 430 #endif 431 432 memset(&sv, 0, sizeof(sv)); 433 sv.sv_mask = SIGBLOCK; 434 sv.sv_handler = retry; 435 sigvec(SIGALRM, &sv, (struct sigvec *)0); 436 config(SIGHUP); 437 sv.sv_handler = config; 438 sigvec(SIGHUP, &sv, (struct sigvec *)0); 439 sv.sv_handler = reapchild; 440 sigvec(SIGCHLD, &sv, (struct sigvec *)0); 441 sv.sv_handler = goaway; 442 sigvec(SIGTERM, &sv, (struct sigvec *)0); 443 sv.sv_handler = goaway; 444 sigvec(SIGINT, &sv, (struct sigvec *)0); 445 sv.sv_mask = 0L; 446 sv.sv_handler = SIG_IGN; 447 sigvec(SIGPIPE, &sv, (struct sigvec *)0); 448 449 { 450 /* space for daemons to overwrite environment for ps */ 451 #define DUMMYSIZE 100 452 char dummy[DUMMYSIZE]; 453 454 (void)memset(dummy, 'x', DUMMYSIZE - 1); 455 dummy[DUMMYSIZE - 1] = '\0'; 456 457 (void)setenv("inetd_dummy", dummy, 1); 458 } 459 460 for (;;) { 461 int n, ctrl; 462 fd_set readable; 463 464 if (nsock == 0) { 465 (void) sigblock(SIGBLOCK); 466 while (nsock == 0) 467 sigpause(0L); 468 (void) sigsetmask(0L); 469 } 470 readable = allsock; 471 if ((n = select(maxsock + 1, &readable, (fd_set *)0, 472 (fd_set *)0, (struct timeval *)0)) <= 0) { 473 if (n == -1 && errno != EINTR) { 474 syslog(LOG_WARNING, "select: %m"); 475 sleep(1); 476 } 477 continue; 478 } 479 for (sep = servtab; n && sep; sep = nsep) { 480 nsep = sep->se_next; 481 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) { 482 n--; 483 if (debug) 484 fprintf(stderr, "someone wants %s\n", sep->se_service); 485 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 486 /* XXX here do the libwrap check-before-accept */ 487 ctrl = accept(sep->se_fd, (struct sockaddr *)0, 488 (int *)0); 489 if (debug) 490 fprintf(stderr, "accept, ctrl %d\n", ctrl); 491 if (ctrl < 0) { 492 if (errno != EINTR) 493 syslog(LOG_WARNING, 494 "accept (for %s): %m", 495 sep->se_service); 496 continue; 497 } 498 } else 499 ctrl = sep->se_fd; 500 (void) sigblock(SIGBLOCK); 501 pid = 0; 502 #ifdef LIBWRAP_INTERNAL 503 dofork = 1; 504 #else 505 dofork = (sep->se_bi == 0 || sep->se_bi->bi_fork); 506 #endif 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 if (pid < 0) { 534 syslog(LOG_ERR, "fork: %m"); 535 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 536 close(ctrl); 537 sigsetmask(0L); 538 sleep(1); 539 continue; 540 } 541 if (pid != 0 && sep->se_wait) { 542 sep->se_wait = pid; 543 FD_CLR(sep->se_fd, &allsock); 544 nsock--; 545 } 546 if (pid == 0) { 547 sv.sv_mask = 0L; 548 sv.sv_handler = SIG_DFL; 549 sigvec(SIGPIPE, &sv, (struct sigvec *)0); 550 if (debug) 551 setsid(); 552 } 553 } 554 sigsetmask(0L); 555 if (pid == 0) { 556 run_service(ctrl, sep); 557 if (dofork) 558 exit(0); 559 } 560 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 561 close(ctrl); 562 } 563 } 564 } 565 } 566 567 void 568 run_service(ctrl, sep) 569 int ctrl; 570 struct servtab *sep; 571 { 572 struct passwd *pwd; 573 struct group *grp = NULL; /* XXX gcc */ 574 #ifdef LIBWRAP 575 struct request_info req; 576 int denied; 577 char buf[7], *service = NULL; /* XXX gcc */ 578 #endif 579 580 #ifdef LIBWRAP 581 #ifndef LIBWRAP_INTERNAL 582 if (sep->se_bi == 0) 583 #endif 584 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 585 request_init(&req, RQ_DAEMON, sep->se_argv[0] ? 586 sep->se_argv[0] : sep->se_service, RQ_FILE, ctrl, NULL); 587 fromhost(&req); 588 denied = !hosts_access(&req); 589 if (denied || lflag) { 590 sp = getservbyport(sep->se_ctrladdr_in.sin_port, 591 sep->se_proto); 592 if (sp == NULL) { 593 (void)snprintf(buf, sizeof buf, "%d", 594 ntohs(sep->se_ctrladdr_in.sin_port)); 595 service = buf; 596 } else 597 service = sp->s_name; 598 } 599 if (denied) { 600 syslog(deny_severity, 601 "refused connection from %.500s, service %s (%s)", 602 eval_client(&req), service, sep->se_proto); 603 goto reject; 604 } 605 if (lflag) { 606 syslog(allow_severity, 607 "connection from %.500s, service %s (%s)", 608 eval_client(&req), service, sep->se_proto); 609 } 610 } 611 #endif /* LIBWRAP */ 612 613 if (sep->se_bi) { 614 (*sep->se_bi->bi_fn)(ctrl, sep); 615 } else { 616 if ((pwd = getpwnam(sep->se_user)) == NULL) { 617 syslog(LOG_ERR, "%s/%s: %s: No such user", 618 sep->se_service, sep->se_proto, sep->se_user); 619 goto reject; 620 } 621 if (sep->se_group && 622 (grp = getgrnam(sep->se_group)) == NULL) { 623 syslog(LOG_ERR, "%s/%s: %s: No such group", 624 sep->se_service, sep->se_proto, sep->se_group); 625 goto reject; 626 } 627 if (pwd->pw_uid) { 628 if (sep->se_group) 629 pwd->pw_gid = grp->gr_gid; 630 if (setgid(pwd->pw_gid) < 0) { 631 syslog(LOG_ERR, 632 "%s/%s: can't set gid %d: %m", sep->se_service, 633 sep->se_proto, pwd->pw_gid); 634 goto reject; 635 } 636 (void) initgroups(pwd->pw_name, 637 pwd->pw_gid); 638 if (setuid(pwd->pw_uid) < 0) { 639 syslog(LOG_ERR, 640 "%s/%s: can't set uid %d: %m", sep->se_service, 641 sep->se_proto, pwd->pw_uid); 642 goto reject; 643 } 644 } else if (sep->se_group) { 645 (void) setgid((gid_t)grp->gr_gid); 646 } 647 if (debug) 648 fprintf(stderr, "%d execl %s\n", 649 getpid(), sep->se_server); 650 #ifdef MULOG 651 if (sep->se_log) 652 dolog(sep, ctrl); 653 #endif 654 /* Set our control descriptor to not close-on-exec... */ 655 if (fcntl(ctrl, F_SETFD, 0) < 0) 656 syslog(LOG_ERR, "fcntl (F_SETFD, 0): %m"); 657 /* ...and dup it to stdin, stdout, and stderr. */ 658 if (ctrl != 0) { 659 dup2(ctrl, 0); 660 close(ctrl); 661 ctrl = 0; 662 } 663 dup2(0, 1); 664 dup2(0, 2); 665 #ifdef RLIMIT_NOFILE 666 if (rlim_ofile.rlim_cur != rlim_ofile_cur && 667 setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) 668 syslog(LOG_ERR, "setrlimit: %m"); 669 #endif 670 execv(sep->se_server, sep->se_argv); 671 syslog(LOG_ERR, "cannot execute %s: %m", sep->se_server); 672 reject: 673 if (sep->se_socktype != SOCK_STREAM) 674 recv(ctrl, buf, sizeof (buf), 0); 675 _exit(1); 676 } 677 } 678 679 void 680 reapchild(signo) 681 int signo; 682 { 683 int status; 684 pid_t pid; 685 struct servtab *sep; 686 687 for (;;) { 688 pid = wait3(&status, WNOHANG, (struct rusage *)0); 689 if (pid <= 0) 690 break; 691 if (debug) 692 fprintf(stderr, "%d reaped, status %#x\n", 693 pid, status); 694 for (sep = servtab; sep; sep = sep->se_next) 695 if (sep->se_wait == pid) { 696 if (WIFEXITED(status) && WEXITSTATUS(status)) 697 syslog(LOG_WARNING, 698 "%s: exit status 0x%x", 699 sep->se_server, WEXITSTATUS(status)); 700 else if (WIFSIGNALED(status)) 701 syslog(LOG_WARNING, 702 "%s: exit signal 0x%x", 703 sep->se_server, WTERMSIG(status)); 704 sep->se_wait = 1; 705 FD_SET(sep->se_fd, &allsock); 706 nsock++; 707 if (debug) 708 fprintf(stderr, "restored %s, fd %d\n", 709 sep->se_service, sep->se_fd); 710 } 711 } 712 } 713 714 void 715 config(signo) 716 int signo; 717 { 718 struct servtab *sep, *cp, **sepp; 719 long omask; 720 int n; 721 722 if (!setconfig()) { 723 syslog(LOG_ERR, "%s: %m", CONFIG); 724 return; 725 } 726 for (sep = servtab; sep; sep = sep->se_next) 727 sep->se_checked = 0; 728 while ((cp = getconfigent())) { 729 for (sep = servtab; sep; sep = sep->se_next) 730 if (strcmp(sep->se_service, cp->se_service) == 0 && 731 strcmp(sep->se_hostaddr, cp->se_hostaddr) == 0 && 732 strcmp(sep->se_proto, cp->se_proto) == 0 && 733 ISMUX(sep) == ISMUX(cp)) 734 break; 735 if (sep != 0) { 736 int i; 737 738 #define SWAP(type, a, b) {type c=(type)a; (type)a=(type)b; (type)b=(type)c;} 739 740 omask = sigblock(SIGBLOCK); 741 /* 742 * sep->se_wait may be holding the pid of a daemon 743 * that we're waiting for. If so, don't overwrite 744 * it unless the config file explicitly says don't 745 * wait. 746 */ 747 if (cp->se_bi == 0 && 748 (sep->se_wait == 1 || cp->se_wait == 0)) 749 sep->se_wait = cp->se_wait; 750 SWAP(char *, sep->se_user, cp->se_user); 751 SWAP(char *, sep->se_group, cp->se_group); 752 SWAP(char *, sep->se_server, cp->se_server); 753 for (i = 0; i < MAXARGV; i++) 754 SWAP(char *, sep->se_argv[i], cp->se_argv[i]); 755 SWAP(int, cp->se_type, sep->se_type); 756 SWAP(int, cp->se_max, sep->se_max); 757 #undef SWAP 758 if (isrpcservice(sep)) 759 unregister_rpc(sep); 760 sep->se_rpcversl = cp->se_rpcversl; 761 sep->se_rpcversh = cp->se_rpcversh; 762 sigsetmask(omask); 763 freeconfig(cp); 764 if (debug) 765 print_service("REDO", sep); 766 } else { 767 sep = enter(cp); 768 if (debug) 769 print_service("ADD ", sep); 770 } 771 sep->se_checked = 1; 772 773 switch (sep->se_family) { 774 case AF_UNIX: 775 if (sep->se_fd != -1) 776 break; 777 n = strlen(sep->se_service); 778 if (n > sizeof(sep->se_ctrladdr_un.sun_path)) { 779 syslog(LOG_ERR, "%s: address too long", 780 sep->se_service); 781 sep->se_checked = 0; 782 continue; 783 } 784 (void)unlink(sep->se_service); 785 strncpy(sep->se_ctrladdr_un.sun_path, 786 sep->se_service, n); 787 sep->se_ctrladdr_un.sun_family = AF_UNIX; 788 sep->se_ctrladdr_size = n + 789 sizeof(sep->se_ctrladdr_un) - 790 sizeof(sep->se_ctrladdr_un.sun_path); 791 if (!ISMUX(sep)) 792 setup(sep); 793 break; 794 case AF_INET: 795 sep->se_ctrladdr_in.sin_family = AF_INET; 796 if (!strcmp(sep->se_hostaddr,"*")) 797 sep->se_ctrladdr_in.sin_addr.s_addr = 798 INADDR_ANY; 799 else if (!inet_aton(sep->se_hostaddr, 800 &sep->se_ctrladdr_in.sin_addr)) { 801 /* Do we really want to support hostname lookups here? */ 802 struct hostent *hp; 803 hp = gethostbyname(sep->se_hostaddr); 804 if (hp == 0) { 805 syslog(LOG_ERR, "%s: unknown host", 806 sep->se_hostaddr); 807 sep->se_checked = 0; 808 continue; 809 } else if (hp->h_addrtype != AF_INET) { 810 syslog(LOG_ERR, 811 "%s: address isn't an Internet address", 812 sep->se_hostaddr); 813 sep->se_checked = 0; 814 continue; 815 } else if (hp->h_length != sizeof(struct in_addr)) { 816 syslog(LOG_ERR, 817 "%s: address size wrong (under DNS corruption attack?)", 818 sep->se_hostaddr); 819 sep->se_checked = 0; 820 continue; 821 } else { 822 memcpy(&sep->se_ctrladdr_in.sin_addr, 823 hp->h_addr_list[0], 824 sizeof(struct in_addr)); 825 } 826 } 827 if (ISMUX(sep)) { 828 sep->se_fd = -1; 829 continue; 830 } 831 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr_in); 832 if (isrpcservice(sep)) { 833 struct rpcent *rp; 834 835 sep->se_rpcprog = atoi(sep->se_service); 836 if (sep->se_rpcprog == 0) { 837 rp = getrpcbyname(sep->se_service); 838 if (rp == 0) { 839 syslog(LOG_ERR, 840 "%s/%s: unknown service", 841 sep->se_service, 842 sep->se_proto); 843 sep->se_checked = 0; 844 continue; 845 } 846 sep->se_rpcprog = rp->r_number; 847 } 848 if (sep->se_fd == -1 && !ISMUX(sep)) 849 setup(sep); 850 if (sep->se_fd != -1) 851 register_rpc(sep); 852 } else { 853 u_short port = htons(atoi(sep->se_service)); 854 855 if (!port) { 856 sp = getservbyname(sep->se_service, 857 sep->se_proto); 858 if (sp == 0) { 859 syslog(LOG_ERR, 860 "%s/%s: unknown service", 861 sep->se_service, 862 sep->se_proto); 863 sep->se_checked = 0; 864 continue; 865 } 866 port = sp->s_port; 867 } 868 if (port != sep->se_ctrladdr_in.sin_port) { 869 sep->se_ctrladdr_in.sin_port = port; 870 if (sep->se_fd >= 0) 871 close_sep(sep); 872 } 873 if (sep->se_fd == -1 && !ISMUX(sep)) 874 setup(sep); 875 } 876 } 877 } 878 endconfig(); 879 /* 880 * Purge anything not looked at above. 881 */ 882 omask = sigblock(SIGBLOCK); 883 sepp = &servtab; 884 while ((sep = *sepp)) { 885 if (sep->se_checked) { 886 sepp = &sep->se_next; 887 continue; 888 } 889 *sepp = sep->se_next; 890 if (sep->se_fd >= 0) 891 close_sep(sep); 892 if (isrpcservice(sep)) 893 unregister_rpc(sep); 894 if (sep->se_family == AF_UNIX) 895 (void)unlink(sep->se_service); 896 if (debug) 897 print_service("FREE", sep); 898 freeconfig(sep); 899 free((char *)sep); 900 } 901 (void) sigsetmask(omask); 902 } 903 904 void 905 retry(signo) 906 int signo; 907 { 908 struct servtab *sep; 909 910 timingout = 0; 911 for (sep = servtab; sep; sep = sep->se_next) { 912 if (sep->se_fd == -1 && !ISMUX(sep)) { 913 switch (sep->se_family) { 914 case AF_UNIX: 915 case AF_INET: 916 setup(sep); 917 if (sep->se_fd != -1 && isrpcservice(sep)) 918 register_rpc(sep); 919 break; 920 } 921 } 922 } 923 } 924 925 void 926 goaway(signo) 927 int signo; 928 { 929 struct servtab *sep; 930 931 for (sep = servtab; sep; sep = sep->se_next) { 932 if (sep->se_fd == -1) 933 continue; 934 935 switch (sep->se_family) { 936 case AF_UNIX: 937 (void)unlink(sep->se_service); 938 break; 939 case AF_INET: 940 if (sep->se_wait == 1 && isrpcservice(sep)) 941 unregister_rpc(sep); 942 break; 943 } 944 (void)close(sep->se_fd); 945 } 946 (void)unlink(_PATH_INETDPID); 947 exit(0); 948 } 949 950 void 951 setup(sep) 952 struct servtab *sep; 953 { 954 int on = 1; 955 956 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) { 957 if (debug) 958 fprintf(stderr, "socket failed on %s/%s: %s\n", 959 sep->se_service, sep->se_proto, strerror(errno)); 960 syslog(LOG_ERR, "%s/%s: socket: %m", 961 sep->se_service, sep->se_proto); 962 return; 963 } 964 /* Set all listening sockets to close-on-exec. */ 965 if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) 966 syslog(LOG_ERR, "fcntl (F_SETFD, FD_CLOEXEC): %m"); 967 #define turnon(fd, opt) \ 968 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 969 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 970 turnon(sep->se_fd, SO_DEBUG) < 0) 971 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 972 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 973 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 974 #undef turnon 975 if (bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size) < 0) { 976 if (debug) 977 fprintf(stderr, "bind failed on %s/%s: %s\n", 978 sep->se_service, sep->se_proto, strerror(errno)); 979 syslog(LOG_ERR, "%s/%s: bind: %m", 980 sep->se_service, sep->se_proto); 981 (void) close(sep->se_fd); 982 sep->se_fd = -1; 983 if (!timingout) { 984 timingout = 1; 985 alarm(RETRYTIME); 986 } 987 return; 988 } 989 if (sep->se_socktype == SOCK_STREAM) 990 listen(sep->se_fd, 10); 991 992 FD_SET(sep->se_fd, &allsock); 993 nsock++; 994 if (sep->se_fd > maxsock) { 995 maxsock = sep->se_fd; 996 if (maxsock > rlim_ofile_cur - FD_MARGIN) 997 bump_nofile(); 998 } 999 if (debug) 1000 fprintf(stderr, "registered %s on %d\n", 1001 sep->se_server, sep->se_fd); 1002 } 1003 1004 /* 1005 * Finish with a service and its socket. 1006 */ 1007 void 1008 close_sep(sep) 1009 struct servtab *sep; 1010 { 1011 if (sep->se_fd >= 0) { 1012 nsock--; 1013 FD_CLR(sep->se_fd, &allsock); 1014 (void) close(sep->se_fd); 1015 sep->se_fd = -1; 1016 } 1017 sep->se_count = 0; 1018 /* 1019 * Don't keep the pid of this running deamon: when reapchild() 1020 * reaps this pid, it would erroneously increment nsock. 1021 */ 1022 if (sep->se_wait > 1) 1023 sep->se_wait = 1; 1024 } 1025 1026 void 1027 register_rpc(sep) 1028 struct servtab *sep; 1029 { 1030 #ifdef RPC 1031 int n; 1032 struct sockaddr_in sin; 1033 struct protoent *pp; 1034 1035 if ((pp = getprotobyname(sep->se_proto+4)) == NULL) { 1036 syslog(LOG_ERR, "%s: getproto: %m", 1037 sep->se_proto); 1038 return; 1039 } 1040 n = sizeof sin; 1041 if (getsockname(sep->se_fd, (struct sockaddr *)&sin, &n) < 0) { 1042 syslog(LOG_ERR, "%s/%s: getsockname: %m", 1043 sep->se_service, sep->se_proto); 1044 return; 1045 } 1046 1047 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1048 if (debug) 1049 fprintf(stderr, "pmap_set: %u %u %u %u\n", 1050 sep->se_rpcprog, n, pp->p_proto, 1051 ntohs(sin.sin_port)); 1052 (void)pmap_unset(sep->se_rpcprog, n); 1053 if (!pmap_set(sep->se_rpcprog, n, pp->p_proto, ntohs(sin.sin_port))) 1054 syslog(LOG_ERR, "pmap_set: %u %u %u %u: %m", 1055 sep->se_rpcprog, n, pp->p_proto, 1056 ntohs(sin.sin_port)); 1057 } 1058 #endif /* RPC */ 1059 } 1060 1061 void 1062 unregister_rpc(sep) 1063 struct servtab *sep; 1064 { 1065 #ifdef RPC 1066 int n; 1067 1068 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1069 if (debug) 1070 fprintf(stderr, "pmap_unset(%u, %u)\n", 1071 sep->se_rpcprog, n); 1072 if (!pmap_unset(sep->se_rpcprog, n)) 1073 syslog(LOG_ERR, "pmap_unset(%u, %u)\n", 1074 sep->se_rpcprog, n); 1075 } 1076 #endif /* RPC */ 1077 } 1078 1079 1080 struct servtab * 1081 enter(cp) 1082 struct servtab *cp; 1083 { 1084 struct servtab *sep; 1085 long omask; 1086 1087 sep = (struct servtab *)malloc(sizeof (*sep)); 1088 if (sep == (struct servtab *)0) { 1089 syslog(LOG_ERR, "Out of memory."); 1090 exit(-1); 1091 } 1092 *sep = *cp; 1093 sep->se_fd = -1; 1094 sep->se_rpcprog = -1; 1095 omask = sigblock(SIGBLOCK); 1096 sep->se_next = servtab; 1097 servtab = sep; 1098 sigsetmask(omask); 1099 return (sep); 1100 } 1101 1102 FILE *fconfig = NULL; 1103 struct servtab serv; 1104 char line[LINE_MAX]; 1105 char *defhost; 1106 1107 int 1108 setconfig() 1109 { 1110 if (defhost) free(defhost); 1111 defhost = newstr("*"); 1112 if (fconfig != NULL) { 1113 fseek(fconfig, 0L, SEEK_SET); 1114 return (1); 1115 } 1116 fconfig = fopen(CONFIG, "r"); 1117 return (fconfig != NULL); 1118 } 1119 1120 void 1121 endconfig() 1122 { 1123 if (fconfig) { 1124 (void) fclose(fconfig); 1125 fconfig = NULL; 1126 } 1127 if (defhost) { 1128 free(defhost); 1129 defhost = 0; 1130 } 1131 } 1132 1133 struct servtab * 1134 getconfigent() 1135 { 1136 struct servtab *sep = &serv; 1137 int argc; 1138 char *cp, *arg; 1139 static char TCPMUX_TOKEN[] = "tcpmux/"; 1140 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) 1141 char *hostdelim; 1142 1143 more: 1144 #ifdef MULOG 1145 while ((cp = nextline(fconfig)) && (*cp == '#' || *cp == '\0')) { 1146 /* Avoid use of `skip' if there is a danger of it looking 1147 * at continuation lines. 1148 */ 1149 do { 1150 cp++; 1151 } while (*cp == ' ' || *cp == '\t'); 1152 if (*cp == '\0') 1153 continue; 1154 if ((arg = skip(&cp)) == NULL) 1155 continue; 1156 if (strcmp(arg, "DOMAIN")) 1157 continue; 1158 if (curdom) 1159 free(curdom); 1160 curdom = NULL; 1161 while (*cp == ' ' || *cp == '\t') 1162 cp++; 1163 if (*cp == '\0') 1164 continue; 1165 arg = cp; 1166 while (*cp && *cp != ' ' && *cp != '\t') 1167 cp++; 1168 if (*cp != '\0') 1169 *cp++ = '\0'; 1170 curdom = newstr(arg); 1171 } 1172 #else 1173 while ((cp = nextline(fconfig)) && (*cp == '#' || *cp == '\0')) 1174 ; 1175 #endif 1176 if (cp == NULL) 1177 return ((struct servtab *)0); 1178 /* 1179 * clear the static buffer, since some fields (se_ctrladdr, 1180 * for example) don't get initialized here. 1181 */ 1182 memset((caddr_t)sep, 0, sizeof *sep); 1183 arg = skip(&cp); 1184 if (cp == NULL) { 1185 /* got an empty line containing just blanks/tabs. */ 1186 goto more; 1187 } 1188 /* Check for a host name. */ 1189 hostdelim = strrchr(arg, ':'); 1190 if (hostdelim) { 1191 *hostdelim = '\0'; 1192 sep->se_hostaddr = newstr(arg); 1193 arg = hostdelim + 1; 1194 /* 1195 * If the line is of the form `host:', then just change the 1196 * default host for the following lines. 1197 */ 1198 if (*arg == '\0') { 1199 arg = skip(&cp); 1200 if (cp == NULL) { 1201 free(defhost); 1202 defhost = sep->se_hostaddr; 1203 goto more; 1204 } 1205 } 1206 } else 1207 sep->se_hostaddr = newstr(defhost); 1208 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1209 char *c = arg + MUX_LEN; 1210 if (*c == '+') { 1211 sep->se_type = MUXPLUS_TYPE; 1212 c++; 1213 } else 1214 sep->se_type = MUX_TYPE; 1215 sep->se_service = newstr(c); 1216 } else { 1217 sep->se_service = newstr(arg); 1218 sep->se_type = NORM_TYPE; 1219 } 1220 1221 arg = sskip(&cp); 1222 if (strcmp(arg, "stream") == 0) 1223 sep->se_socktype = SOCK_STREAM; 1224 else if (strcmp(arg, "dgram") == 0) 1225 sep->se_socktype = SOCK_DGRAM; 1226 else if (strcmp(arg, "rdm") == 0) 1227 sep->se_socktype = SOCK_RDM; 1228 else if (strcmp(arg, "seqpacket") == 0) 1229 sep->se_socktype = SOCK_SEQPACKET; 1230 else if (strcmp(arg, "raw") == 0) 1231 sep->se_socktype = SOCK_RAW; 1232 else 1233 sep->se_socktype = -1; 1234 1235 sep->se_proto = newstr(sskip(&cp)); 1236 if (strcmp(sep->se_proto, "unix") == 0) { 1237 sep->se_family = AF_UNIX; 1238 } else { 1239 sep->se_family = AF_INET; 1240 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1241 #ifdef RPC 1242 char *cp, *ccp; 1243 cp = strchr(sep->se_service, '/'); 1244 if (cp == 0) { 1245 syslog(LOG_ERR, "%s: no rpc version", 1246 sep->se_service); 1247 goto more; 1248 } 1249 *cp++ = '\0'; 1250 sep->se_rpcversl = sep->se_rpcversh = 1251 strtol(cp, &ccp, 0); 1252 if (ccp == cp) { 1253 badafterall: 1254 syslog(LOG_ERR, "%s/%s: bad rpc version", 1255 sep->se_service, cp); 1256 goto more; 1257 } 1258 if (*ccp == '-') { 1259 cp = ccp + 1; 1260 sep->se_rpcversh = strtol(cp, &ccp, 0); 1261 if (ccp == cp) 1262 goto badafterall; 1263 } 1264 #else 1265 syslog(LOG_ERR, "%s: rpc services not suported", 1266 sep->se_service); 1267 goto more; 1268 #endif /* RPC */ 1269 } 1270 } 1271 arg = sskip(&cp); 1272 { 1273 char *cp; 1274 cp = strchr(arg, '.'); 1275 if (cp) { 1276 *cp++ = '\0'; 1277 sep->se_max = atoi(cp); 1278 } else 1279 sep->se_max = TOOMANY; 1280 } 1281 sep->se_wait = strcmp(arg, "wait") == 0; 1282 if (ISMUX(sep)) { 1283 /* 1284 * Silently enforce "nowait" for TCPMUX services since 1285 * they don't have an assigned port to listen on. 1286 */ 1287 sep->se_wait = 0; 1288 1289 if (strcmp(sep->se_proto, "tcp")) { 1290 syslog(LOG_ERR, 1291 "%s: bad protocol for tcpmux service %s", 1292 CONFIG, sep->se_service); 1293 goto more; 1294 } 1295 if (sep->se_socktype != SOCK_STREAM) { 1296 syslog(LOG_ERR, 1297 "%s: bad socket type for tcpmux service %s", 1298 CONFIG, sep->se_service); 1299 goto more; 1300 } 1301 } 1302 sep->se_user = newstr(sskip(&cp)); 1303 if ((sep->se_group = strchr(sep->se_user, '.'))) 1304 *sep->se_group++ = '\0'; 1305 sep->se_server = newstr(sskip(&cp)); 1306 if (strcmp(sep->se_server, "internal") == 0) { 1307 struct biltin *bi; 1308 1309 for (bi = biltins; bi->bi_service; bi++) 1310 if (bi->bi_socktype == sep->se_socktype && 1311 strcmp(bi->bi_service, sep->se_service) == 0) 1312 break; 1313 if (bi->bi_service == 0) { 1314 syslog(LOG_ERR, "internal service %s unknown", 1315 sep->se_service); 1316 goto more; 1317 } 1318 sep->se_bi = bi; 1319 sep->se_wait = bi->bi_wait; 1320 } else 1321 sep->se_bi = NULL; 1322 argc = 0; 1323 for (arg = skip(&cp); cp; arg = skip(&cp)) { 1324 #if MULOG 1325 char *colon; 1326 1327 if (argc == 0 && (colon = strrchr(arg, ':'))) { 1328 while (arg < colon) { 1329 int x; 1330 char *ccp; 1331 1332 switch (*arg++) { 1333 case 'l': 1334 x = 1; 1335 if (isdigit(*arg)) { 1336 x = strtol(arg, &ccp, 0); 1337 if (ccp == arg) 1338 break; 1339 arg = ccp; 1340 } 1341 sep->se_log &= ~MULOG_RFC931; 1342 sep->se_log |= x; 1343 break; 1344 case 'a': 1345 sep->se_log |= MULOG_RFC931; 1346 break; 1347 default: 1348 break; 1349 } 1350 } 1351 arg = colon + 1; 1352 } 1353 #endif 1354 if (argc < MAXARGV) 1355 sep->se_argv[argc++] = newstr(arg); 1356 } 1357 while (argc <= MAXARGV) 1358 sep->se_argv[argc++] = NULL; 1359 return (sep); 1360 } 1361 1362 void 1363 freeconfig(cp) 1364 struct servtab *cp; 1365 { 1366 int i; 1367 1368 if (cp->se_hostaddr) 1369 free(cp->se_hostaddr); 1370 if (cp->se_service) 1371 free(cp->se_service); 1372 if (cp->se_proto) 1373 free(cp->se_proto); 1374 if (cp->se_user) 1375 free(cp->se_user); 1376 /* Note: se_group is part of the newstr'ed se_user */ 1377 if (cp->se_server) 1378 free(cp->se_server); 1379 for (i = 0; i < MAXARGV; i++) 1380 if (cp->se_argv[i]) 1381 free(cp->se_argv[i]); 1382 } 1383 1384 1385 /* 1386 * Safe skip - if skip returns null, log a syntax error in the 1387 * configuration file and exit. 1388 */ 1389 char * 1390 sskip(cpp) 1391 char **cpp; 1392 { 1393 char *cp; 1394 1395 cp = skip(cpp); 1396 if (cp == NULL) { 1397 syslog(LOG_ERR, "%s: syntax error", CONFIG); 1398 exit(-1); 1399 } 1400 return (cp); 1401 } 1402 1403 char * 1404 skip(cpp) 1405 char **cpp; 1406 { 1407 char *cp = *cpp; 1408 char *start; 1409 1410 if (*cpp == NULL) 1411 return ((char *)0); 1412 1413 again: 1414 while (*cp == ' ' || *cp == '\t') 1415 cp++; 1416 if (*cp == '\0') { 1417 int c; 1418 1419 c = getc(fconfig); 1420 (void) ungetc(c, fconfig); 1421 if (c == ' ' || c == '\t') 1422 if ((cp = nextline(fconfig))) 1423 goto again; 1424 *cpp = (char *)0; 1425 return ((char *)0); 1426 } 1427 start = cp; 1428 while (*cp && *cp != ' ' && *cp != '\t') 1429 cp++; 1430 if (*cp != '\0') 1431 *cp++ = '\0'; 1432 *cpp = cp; 1433 return (start); 1434 } 1435 1436 char * 1437 nextline(fd) 1438 FILE *fd; 1439 { 1440 char *cp; 1441 1442 if (fgets(line, sizeof (line), fd) == NULL) 1443 return ((char *)0); 1444 cp = strchr(line, '\n'); 1445 if (cp) 1446 *cp = '\0'; 1447 return (line); 1448 } 1449 1450 char * 1451 newstr(cp) 1452 char *cp; 1453 { 1454 if ((cp = strdup(cp ? cp : ""))) 1455 return (cp); 1456 syslog(LOG_ERR, "strdup: %m"); 1457 exit(-1); 1458 } 1459 1460 void 1461 inetd_setproctitle(a, s) 1462 char *a; 1463 int s; 1464 { 1465 int size; 1466 char *cp; 1467 struct sockaddr_in sin; 1468 char buf[80]; 1469 1470 cp = Argv[0]; 1471 size = sizeof(sin); 1472 if (getpeername(s, (struct sockaddr *)&sin, &size) == 0) 1473 (void)snprintf(buf, sizeof buf, "-%s [%s]", a, 1474 inet_ntoa(sin.sin_addr)); 1475 else 1476 (void)snprintf(buf, sizeof buf, "-%s", a); 1477 strncpy(cp, buf, LastArg - cp); 1478 cp += strlen(cp); 1479 while (cp < LastArg) 1480 *cp++ = ' '; 1481 } 1482 1483 void 1484 logpid() 1485 { 1486 FILE *fp; 1487 1488 if ((fp = fopen(_PATH_INETDPID, "w")) != NULL) { 1489 fprintf(fp, "%u\n", getpid()); 1490 (void)fclose(fp); 1491 } 1492 } 1493 1494 void 1495 bump_nofile() 1496 { 1497 #ifdef RLIMIT_NOFILE 1498 1499 #define FD_CHUNK 32 1500 1501 struct rlimit rl; 1502 1503 if (getrlimit(RLIMIT_NOFILE, &rl) < 0) { 1504 syslog(LOG_ERR, "getrlimit: %m"); 1505 return; 1506 } 1507 rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK); 1508 if (rl.rlim_cur <= rlim_ofile_cur) { 1509 syslog(LOG_ERR, 1510 "bump_nofile: cannot extend file limit, max = %d", 1511 (int)rl.rlim_cur); 1512 return; 1513 } 1514 1515 if (setrlimit(RLIMIT_NOFILE, &rl) < 0) { 1516 syslog(LOG_ERR, "setrlimit: %m"); 1517 return; 1518 } 1519 1520 rlim_ofile_cur = rl.rlim_cur; 1521 return; 1522 1523 #else 1524 syslog(LOG_ERR, "bump_nofile: cannot extend file limit"); 1525 return; 1526 #endif 1527 } 1528 1529 /* 1530 * Internet services provided internally by inetd: 1531 */ 1532 #define BUFSIZE 4096 1533 1534 /* ARGSUSED */ 1535 void 1536 echo_stream(s, sep) /* Echo service -- echo data back */ 1537 int s; 1538 struct servtab *sep; 1539 { 1540 char buffer[BUFSIZE]; 1541 int i; 1542 1543 inetd_setproctitle(sep->se_service, s); 1544 while ((i = read(s, buffer, sizeof(buffer))) > 0 && 1545 write(s, buffer, i) > 0) 1546 ; 1547 } 1548 1549 /* ARGSUSED */ 1550 void 1551 echo_dg(s, sep) /* Echo service -- echo data back */ 1552 int s; 1553 struct servtab *sep; 1554 { 1555 char buffer[BUFSIZE]; 1556 int i, size; 1557 struct sockaddr sa; 1558 1559 size = sizeof(sa); 1560 if ((i = recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size)) < 0) 1561 return; 1562 (void) sendto(s, buffer, i, 0, &sa, sizeof(sa)); 1563 } 1564 1565 /* ARGSUSED */ 1566 void 1567 discard_stream(s, sep) /* Discard service -- ignore data */ 1568 int s; 1569 struct servtab *sep; 1570 { 1571 char buffer[BUFSIZE]; 1572 1573 inetd_setproctitle(sep->se_service, s); 1574 while ((errno = 0, read(s, buffer, sizeof(buffer)) > 0) || 1575 errno == EINTR) 1576 ; 1577 } 1578 1579 /* ARGSUSED */ 1580 void 1581 discard_dg(s, sep) /* Discard service -- ignore data */ 1582 int s; 1583 struct servtab *sep; 1584 { 1585 char buffer[BUFSIZE]; 1586 1587 (void) read(s, buffer, sizeof(buffer)); 1588 } 1589 1590 #include <ctype.h> 1591 #define LINESIZ 72 1592 char ring[128]; 1593 char *endring; 1594 1595 void 1596 initring() 1597 { 1598 int i; 1599 1600 endring = ring; 1601 1602 for (i = 0; i <= 128; ++i) 1603 if (isprint(i)) 1604 *endring++ = i; 1605 } 1606 1607 /* ARGSUSED */ 1608 void 1609 chargen_stream(s, sep) /* Character generator */ 1610 int s; 1611 struct servtab *sep; 1612 { 1613 int len; 1614 char *rs, text[LINESIZ+2]; 1615 1616 inetd_setproctitle(sep->se_service, s); 1617 1618 if (!endring) { 1619 initring(); 1620 rs = ring; 1621 } 1622 1623 text[LINESIZ] = '\r'; 1624 text[LINESIZ + 1] = '\n'; 1625 for (rs = ring;;) { 1626 if ((len = endring - rs) >= LINESIZ) 1627 memmove(text, rs, LINESIZ); 1628 else { 1629 memmove(text, rs, len); 1630 memmove(text + len, ring, LINESIZ - len); 1631 } 1632 if (++rs == endring) 1633 rs = ring; 1634 if (write(s, text, sizeof(text)) != sizeof(text)) 1635 break; 1636 } 1637 } 1638 1639 /* ARGSUSED */ 1640 void 1641 chargen_dg(s, sep) /* Character generator */ 1642 int s; 1643 struct servtab *sep; 1644 { 1645 struct sockaddr sa; 1646 static char *rs; 1647 int len, size; 1648 char text[LINESIZ+2]; 1649 1650 if (endring == 0) { 1651 initring(); 1652 rs = ring; 1653 } 1654 1655 size = sizeof(sa); 1656 if (recvfrom(s, text, sizeof(text), 0, &sa, &size) < 0) 1657 return; 1658 1659 if ((len = endring - rs) >= LINESIZ) 1660 memmove(text, rs, LINESIZ); 1661 else { 1662 memmove(text, rs, len); 1663 memmove(text + len, ring, LINESIZ - len); 1664 } 1665 if (++rs == endring) 1666 rs = ring; 1667 text[LINESIZ] = '\r'; 1668 text[LINESIZ + 1] = '\n'; 1669 (void) sendto(s, text, sizeof(text), 0, &sa, sizeof(sa)); 1670 } 1671 1672 /* 1673 * Return a machine readable date and time, in the form of the 1674 * number of seconds since midnight, Jan 1, 1900. Since gettimeofday 1675 * returns the number of seconds since midnight, Jan 1, 1970, 1676 * we must add 2208988800 seconds to this figure to make up for 1677 * some seventy years Bell Labs was asleep. 1678 */ 1679 1680 long 1681 machtime() 1682 { 1683 struct timeval tv; 1684 1685 if (gettimeofday(&tv, (struct timezone *)0) < 0) { 1686 if (debug) 1687 fprintf(stderr, "Unable to get time of day\n"); 1688 return (0L); 1689 } 1690 #define OFFSET ((u_long)25567 * 24*60*60) 1691 return (htonl((long)(tv.tv_sec + OFFSET))); 1692 #undef OFFSET 1693 } 1694 1695 /* ARGSUSED */ 1696 void 1697 machtime_stream(s, sep) 1698 int s; 1699 struct servtab *sep; 1700 { 1701 long result; 1702 1703 result = machtime(); 1704 (void) write(s, (char *) &result, sizeof(result)); 1705 } 1706 1707 /* ARGSUSED */ 1708 void 1709 machtime_dg(s, sep) 1710 int s; 1711 struct servtab *sep; 1712 { 1713 long result; 1714 struct sockaddr sa; 1715 int size; 1716 1717 size = sizeof(sa); 1718 if (recvfrom(s, (char *)&result, sizeof(result), 0, &sa, &size) < 0) 1719 return; 1720 result = machtime(); 1721 (void) sendto(s, (char *) &result, sizeof(result), 0, &sa, sizeof(sa)); 1722 } 1723 1724 /* ARGSUSED */ 1725 void 1726 daytime_stream(s, sep) /* Return human-readable time of day */ 1727 int s; 1728 struct servtab *sep; 1729 { 1730 char buffer[256]; 1731 time_t clock; 1732 int len; 1733 1734 clock = time((time_t *) 0); 1735 1736 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 1737 (void) write(s, buffer, len); 1738 } 1739 1740 /* ARGSUSED */ 1741 void 1742 daytime_dg(s, sep) /* Return human-readable time of day */ 1743 int s; 1744 struct servtab *sep; 1745 { 1746 char buffer[256]; 1747 time_t clock; 1748 struct sockaddr sa; 1749 int size, len; 1750 1751 clock = time((time_t *) 0); 1752 1753 size = sizeof(sa); 1754 if (recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size) < 0) 1755 return; 1756 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 1757 (void) sendto(s, buffer, len, 0, &sa, sizeof(sa)); 1758 } 1759 1760 /* 1761 * print_service: 1762 * Dump relevant information to stderr 1763 */ 1764 void 1765 print_service(action, sep) 1766 char *action; 1767 struct servtab *sep; 1768 { 1769 if (isrpcservice(sep)) 1770 fprintf(stderr, 1771 "%s: %s rpcprog=%d, rpcvers = %d/%d, proto=%s, wait.max=%d.%d, user.group=%s.%s builtin=%lx server=%s\n", 1772 action, sep->se_service, 1773 sep->se_rpcprog, sep->se_rpcversh, sep->se_rpcversl, sep->se_proto, 1774 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 1775 (long)sep->se_bi, sep->se_server); 1776 else 1777 fprintf(stderr, 1778 "%s: %s proto=%s, wait.max=%d.%d, user.group=%s.%s builtin=%lx server=%s\n", 1779 action, sep->se_service, sep->se_proto, 1780 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 1781 (long)sep->se_bi, sep->se_server); 1782 } 1783 1784 void 1785 usage() 1786 { 1787 1788 #ifdef LIBWRAP 1789 (void)fprintf(stderr, "usage: %s [-dl] [conf]\n", __progname); 1790 #else 1791 (void)fprintf(stderr, "usage: %s [-d] [conf]\n", __progname); 1792 #endif 1793 exit(1); 1794 } 1795 1796 1797 /* 1798 * Based on TCPMUX.C by Mark K. Lottor November 1988 1799 * sri-nic::ps:<mkl>tcpmux.c 1800 */ 1801 1802 static int /* # of characters upto \r,\n or \0 */ 1803 getline(fd, buf, len) 1804 int fd; 1805 char *buf; 1806 int len; 1807 { 1808 int count = 0, n; 1809 1810 do { 1811 n = read(fd, buf, len-count); 1812 if (n == 0) 1813 return (count); 1814 if (n < 0) 1815 return (-1); 1816 while (--n >= 0) { 1817 if (*buf == '\r' || *buf == '\n' || *buf == '\0') 1818 return (count); 1819 count++; 1820 buf++; 1821 } 1822 } while (count < len); 1823 return (count); 1824 } 1825 1826 #define MAX_SERV_LEN (256+2) /* 2 bytes for \r\n */ 1827 1828 #define strwrite(fd, buf) (void) write(fd, buf, sizeof(buf)-1) 1829 1830 void 1831 tcpmux(ctrl, sep) 1832 int ctrl; 1833 struct servtab *sep; 1834 { 1835 char service[MAX_SERV_LEN+1]; 1836 int len; 1837 1838 /* Get requested service name */ 1839 if ((len = getline(ctrl, service, MAX_SERV_LEN)) < 0) { 1840 strwrite(ctrl, "-Error reading service name\r\n"); 1841 goto reject; 1842 } 1843 service[len] = '\0'; 1844 1845 if (debug) 1846 fprintf(stderr, "tcpmux: someone wants %s\n", service); 1847 1848 /* 1849 * Help is a required command, and lists available services, 1850 * one per line. 1851 */ 1852 if (!strcasecmp(service, "help")) { 1853 strwrite(ctrl, "+Available services:\r\n"); 1854 strwrite(ctrl, "help\r\n"); 1855 for (sep = servtab; sep; sep = sep->se_next) { 1856 if (!ISMUX(sep)) 1857 continue; 1858 (void)write(ctrl, sep->se_service, 1859 strlen(sep->se_service)); 1860 strwrite(ctrl, "\r\n"); 1861 } 1862 goto reject; 1863 } 1864 1865 /* Try matching a service in inetd.conf with the request */ 1866 for (sep = servtab; sep; sep = sep->se_next) { 1867 if (!ISMUX(sep)) 1868 continue; 1869 if (!strcasecmp(service, sep->se_service)) { 1870 if (ISMUXPLUS(sep)) 1871 strwrite(ctrl, "+Go\r\n"); 1872 run_service(ctrl, sep); 1873 return; 1874 } 1875 } 1876 strwrite(ctrl, "-Service not available\r\n"); 1877 reject: 1878 _exit(1); 1879 } 1880 1881 1882 #ifdef MULOG 1883 dolog(sep, ctrl) 1884 struct servtab *sep; 1885 int ctrl; 1886 { 1887 struct sockaddr sa; 1888 struct sockaddr_in *sin = (struct sockaddr_in *)&sa; 1889 int len = sizeof(sa); 1890 struct hostent *hp; 1891 char *host, *dp, buf[BUFSIZ], *rfc931_name(); 1892 int connected = 1; 1893 1894 if (sep->se_family != AF_INET) 1895 return; 1896 1897 if (getpeername(ctrl, &sa, &len) < 0) { 1898 if (errno != ENOTCONN) { 1899 syslog(LOG_ERR, "getpeername: %m"); 1900 return; 1901 } 1902 if (recvfrom(ctrl, buf, sizeof(buf), MSG_PEEK, &sa, &len) < 0) { 1903 syslog(LOG_ERR, "recvfrom: %m"); 1904 return; 1905 } 1906 connected = 0; 1907 } 1908 if (sa.sa_family != AF_INET) { 1909 syslog(LOG_ERR, "unexpected address family %u", sa.sa_family); 1910 return; 1911 } 1912 1913 hp = gethostbyaddr((char *) &sin->sin_addr.s_addr, 1914 sizeof (sin->sin_addr.s_addr), AF_INET); 1915 1916 host = hp?hp->h_name:inet_ntoa(sin->sin_addr); 1917 1918 switch (sep->se_log & ~MULOG_RFC931) { 1919 case 0: 1920 return; 1921 case 1: 1922 if (curdom == NULL || *curdom == '\0') 1923 break; 1924 dp = host + strlen(host) - strlen(curdom); 1925 if (dp < host) 1926 break; 1927 if (debug) 1928 fprintf(stderr, "check \"%s\" against curdom \"%s\"\n", 1929 host, curdom); 1930 if (strcasecmp(dp, curdom) == 0) 1931 return; 1932 break; 1933 case 2: 1934 default: 1935 break; 1936 } 1937 1938 openlog("", LOG_NOWAIT, MULOG); 1939 1940 if (connected && (sep->se_log & MULOG_RFC931)) 1941 syslog(LOG_INFO, "%s@%s wants %s", 1942 rfc931_name(sin, ctrl), host, sep->se_service); 1943 else 1944 syslog(LOG_INFO, "%s wants %s", 1945 host, sep->se_service); 1946 } 1947 1948 /* 1949 * From tcp_log by 1950 * Wietse Venema, Eindhoven University of Technology, The Netherlands. 1951 */ 1952 #if 0 1953 static char sccsid[] = "@(#) rfc931.c 1.3 92/08/31 22:54:46"; 1954 #endif 1955 1956 #include <setjmp.h> 1957 1958 #define RFC931_PORT 113 /* Semi-well-known port */ 1959 #define TIMEOUT 4 1960 #define TIMEOUT2 10 1961 1962 static jmp_buf timebuf; 1963 1964 /* timeout - handle timeouts */ 1965 1966 static void timeout(sig) 1967 int sig; 1968 { 1969 longjmp(timebuf, sig); 1970 } 1971 1972 /* rfc931_name - return remote user name */ 1973 1974 char * 1975 rfc931_name(there, ctrl) 1976 struct sockaddr_in *there; /* remote link information */ 1977 int ctrl; 1978 { 1979 struct sockaddr_in here; /* local link information */ 1980 struct sockaddr_in sin; /* for talking to RFC931 daemon */ 1981 int length; 1982 int s; 1983 unsigned remote; 1984 unsigned local; 1985 static char user[256]; /* XXX */ 1986 char buf[256]; 1987 char *cp; 1988 char *result = "USER_UNKNOWN"; 1989 int len; 1990 1991 /* Find out local port number of our stdin. */ 1992 1993 length = sizeof(here); 1994 if (getsockname(ctrl, (struct sockaddr *) &here, &length) == -1) { 1995 syslog(LOG_ERR, "getsockname: %m"); 1996 return (result); 1997 } 1998 /* Set up timer so we won't get stuck. */ 1999 2000 if ((s = socket(AF_INET, SOCK_STREAM, 0)) == -1) { 2001 syslog(LOG_ERR, "socket: %m"); 2002 return (result); 2003 } 2004 2005 sin = here; 2006 sin.sin_port = htons(0); 2007 if (bind(s, (struct sockaddr *) &sin, sizeof(sin)) == -1) { 2008 syslog(LOG_ERR, "bind: %m"); 2009 return (result); 2010 } 2011 2012 signal(SIGALRM, timeout); 2013 if (setjmp(timebuf)) { 2014 close(s); /* not: fclose(fp) */ 2015 return (result); 2016 } 2017 alarm(TIMEOUT); 2018 2019 /* Connect to the RFC931 daemon. */ 2020 2021 sin = *there; 2022 sin.sin_port = htons(RFC931_PORT); 2023 if (connect(s, (struct sockaddr *) &sin, sizeof(sin)) == -1) { 2024 close(s); 2025 alarm(0); 2026 return (result); 2027 } 2028 2029 /* Query the RFC 931 server. Would 13-byte writes ever be broken up? */ 2030 (void)snprintf(buf, sizeof buf, "%u,%u\r\n", ntohs(there->sin_port), 2031 ntohs(here.sin_port)); 2032 2033 2034 for (len = 0, cp = buf; len < strlen(buf); ) { 2035 int n; 2036 2037 if ((n = write(s, cp, strlen(buf) - len)) == -1) { 2038 close(s); 2039 alarm(0); 2040 return (result); 2041 } 2042 cp += n; 2043 len += n; 2044 } 2045 2046 /* Read response */ 2047 for (cp = buf; cp < buf + sizeof(buf) - 1; ) { 2048 char c; 2049 if (read(s, &c, 1) != 1) { 2050 close(s); 2051 alarm(0); 2052 return (result); 2053 } 2054 if (c == '\n') 2055 break; 2056 *cp++ = c; 2057 } 2058 *cp = '\0'; 2059 2060 if (sscanf(buf, "%u , %u : USERID :%*[^:]:%255s", &remote, &local, user) == 3 2061 && ntohs(there->sin_port) == remote 2062 && ntohs(here.sin_port) == local) { 2063 2064 /* Strip trailing carriage return. */ 2065 if (cp = strchr(user, '\r')) 2066 *cp = 0; 2067 result = user; 2068 } 2069 2070 alarm(0); 2071 close(s); 2072 return (result); 2073 } 2074 #endif 2075
Indexes created Sun Oct 19 21:10:07 GMT 2025