inetd.c revision 1.38.2.4
1 /* $NetBSD: inetd.c,v 1.38.2.4 1999/01/20 07:33:24 cgd 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 1.38.2.4 1999/01/20 07:33:24 cgd 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 /* Set the socket to blocking mode. */ 499 if (fcntl(ctrl, F_SETFL, 0) < 0) 500 syslog(LOG_ERR, "fcntl (F_SETFL, 0): %m"); 501 } else 502 ctrl = sep->se_fd; 503 (void) sigblock(SIGBLOCK); 504 pid = 0; 505 #ifdef LIBWRAP_INTERNAL 506 dofork = 1; 507 #else 508 dofork = (sep->se_bi == 0 || sep->se_bi->bi_fork); 509 #endif 510 if (dofork) { 511 if (sep->se_count++ == 0) 512 (void)gettimeofday(&sep->se_time, 513 (struct timezone *)0); 514 else if (sep->se_count >= sep->se_max) { 515 struct timeval now; 516 517 (void)gettimeofday(&now, (struct timezone *)0); 518 if (now.tv_sec - sep->se_time.tv_sec > 519 CNT_INTVL) { 520 sep->se_time = now; 521 sep->se_count = 1; 522 } else { 523 syslog(LOG_ERR, 524 "%s/%s server failing (looping), service terminated\n", 525 sep->se_service, sep->se_proto); 526 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 527 close(ctrl); 528 close_sep(sep); 529 sigsetmask(0L); 530 if (!timingout) { 531 timingout = 1; 532 alarm(RETRYTIME); 533 } 534 continue; 535 } 536 } 537 pid = fork(); 538 if (pid < 0) { 539 syslog(LOG_ERR, "fork: %m"); 540 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 541 close(ctrl); 542 sigsetmask(0L); 543 sleep(1); 544 continue; 545 } 546 if (pid != 0 && sep->se_wait) { 547 sep->se_wait = pid; 548 FD_CLR(sep->se_fd, &allsock); 549 nsock--; 550 } 551 if (pid == 0) { 552 sv.sv_mask = 0L; 553 sv.sv_handler = SIG_DFL; 554 sigvec(SIGPIPE, &sv, (struct sigvec *)0); 555 if (debug) 556 setsid(); 557 } 558 } 559 sigsetmask(0L); 560 if (pid == 0) { 561 run_service(ctrl, sep); 562 if (dofork) 563 exit(0); 564 } 565 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 566 close(ctrl); 567 } 568 } 569 } 570 } 571 572 void 573 run_service(ctrl, sep) 574 int ctrl; 575 struct servtab *sep; 576 { 577 struct passwd *pwd; 578 struct group *grp = NULL; /* XXX gcc */ 579 #ifdef LIBWRAP 580 struct request_info req; 581 int denied; 582 char buf[7], *service = NULL; /* XXX gcc */ 583 #endif 584 585 #ifdef LIBWRAP 586 #ifndef LIBWRAP_INTERNAL 587 if (sep->se_bi == 0) 588 #endif 589 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 590 request_init(&req, RQ_DAEMON, sep->se_argv[0] ? 591 sep->se_argv[0] : sep->se_service, RQ_FILE, ctrl, NULL); 592 fromhost(&req); 593 denied = !hosts_access(&req); 594 if (denied || lflag) { 595 sp = getservbyport(sep->se_ctrladdr_in.sin_port, 596 sep->se_proto); 597 if (sp == NULL) { 598 (void)snprintf(buf, sizeof buf, "%d", 599 ntohs(sep->se_ctrladdr_in.sin_port)); 600 service = buf; 601 } else 602 service = sp->s_name; 603 } 604 if (denied) { 605 syslog(deny_severity, 606 "refused connection from %.500s, service %s (%s)", 607 eval_client(&req), service, sep->se_proto); 608 goto reject; 609 } 610 if (lflag) { 611 syslog(allow_severity, 612 "connection from %.500s, service %s (%s)", 613 eval_client(&req), service, sep->se_proto); 614 } 615 } 616 #endif /* LIBWRAP */ 617 618 if (sep->se_bi) { 619 (*sep->se_bi->bi_fn)(ctrl, sep); 620 } else { 621 if ((pwd = getpwnam(sep->se_user)) == NULL) { 622 syslog(LOG_ERR, "%s/%s: %s: No such user", 623 sep->se_service, sep->se_proto, sep->se_user); 624 goto reject; 625 } 626 if (sep->se_group && 627 (grp = getgrnam(sep->se_group)) == NULL) { 628 syslog(LOG_ERR, "%s/%s: %s: No such group", 629 sep->se_service, sep->se_proto, sep->se_group); 630 goto reject; 631 } 632 if (pwd->pw_uid) { 633 if (sep->se_group) 634 pwd->pw_gid = grp->gr_gid; 635 if (setgid(pwd->pw_gid) < 0) { 636 syslog(LOG_ERR, 637 "%s/%s: can't set gid %d: %m", sep->se_service, 638 sep->se_proto, pwd->pw_gid); 639 goto reject; 640 } 641 (void) initgroups(pwd->pw_name, 642 pwd->pw_gid); 643 if (setuid(pwd->pw_uid) < 0) { 644 syslog(LOG_ERR, 645 "%s/%s: can't set uid %d: %m", sep->se_service, 646 sep->se_proto, pwd->pw_uid); 647 goto reject; 648 } 649 } else if (sep->se_group) { 650 (void) setgid((gid_t)grp->gr_gid); 651 } 652 if (debug) 653 fprintf(stderr, "%d execl %s\n", 654 getpid(), sep->se_server); 655 #ifdef MULOG 656 if (sep->se_log) 657 dolog(sep, ctrl); 658 #endif 659 /* Set our control descriptor to not close-on-exec... */ 660 if (fcntl(ctrl, F_SETFD, 0) < 0) 661 syslog(LOG_ERR, "fcntl (F_SETFD, 0): %m"); 662 /* ...and dup it to stdin, stdout, and stderr. */ 663 if (ctrl != 0) { 664 dup2(ctrl, 0); 665 close(ctrl); 666 ctrl = 0; 667 } 668 dup2(0, 1); 669 dup2(0, 2); 670 #ifdef RLIMIT_NOFILE 671 if (rlim_ofile.rlim_cur != rlim_ofile_cur && 672 setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) 673 syslog(LOG_ERR, "setrlimit: %m"); 674 #endif 675 execv(sep->se_server, sep->se_argv); 676 syslog(LOG_ERR, "cannot execute %s: %m", sep->se_server); 677 reject: 678 if (sep->se_socktype != SOCK_STREAM) 679 recv(ctrl, buf, sizeof (buf), 0); 680 _exit(1); 681 } 682 } 683 684 void 685 reapchild(signo) 686 int signo; 687 { 688 int status; 689 pid_t pid; 690 struct servtab *sep; 691 692 for (;;) { 693 pid = wait3(&status, WNOHANG, (struct rusage *)0); 694 if (pid <= 0) 695 break; 696 if (debug) 697 fprintf(stderr, "%d reaped, status %#x\n", 698 pid, status); 699 for (sep = servtab; sep; sep = sep->se_next) 700 if (sep->se_wait == pid) { 701 if (WIFEXITED(status) && WEXITSTATUS(status)) 702 syslog(LOG_WARNING, 703 "%s: exit status 0x%x", 704 sep->se_server, WEXITSTATUS(status)); 705 else if (WIFSIGNALED(status)) 706 syslog(LOG_WARNING, 707 "%s: exit signal 0x%x", 708 sep->se_server, WTERMSIG(status)); 709 sep->se_wait = 1; 710 FD_SET(sep->se_fd, &allsock); 711 nsock++; 712 if (debug) 713 fprintf(stderr, "restored %s, fd %d\n", 714 sep->se_service, sep->se_fd); 715 } 716 } 717 } 718 719 void 720 config(signo) 721 int signo; 722 { 723 struct servtab *sep, *cp, **sepp; 724 long omask; 725 int n; 726 727 if (!setconfig()) { 728 syslog(LOG_ERR, "%s: %m", CONFIG); 729 return; 730 } 731 for (sep = servtab; sep; sep = sep->se_next) 732 sep->se_checked = 0; 733 while ((cp = getconfigent())) { 734 for (sep = servtab; sep; sep = sep->se_next) 735 if (strcmp(sep->se_service, cp->se_service) == 0 && 736 strcmp(sep->se_hostaddr, cp->se_hostaddr) == 0 && 737 strcmp(sep->se_proto, cp->se_proto) == 0 && 738 ISMUX(sep) == ISMUX(cp)) 739 break; 740 if (sep != 0) { 741 int i; 742 743 #define SWAP(type, a, b) {type c=(type)a; (type)a=(type)b; (type)b=(type)c;} 744 745 omask = sigblock(SIGBLOCK); 746 /* 747 * sep->se_wait may be holding the pid of a daemon 748 * that we're waiting for. If so, don't overwrite 749 * it unless the config file explicitly says don't 750 * wait. 751 */ 752 if (cp->se_bi == 0 && 753 (sep->se_wait == 1 || cp->se_wait == 0)) 754 sep->se_wait = cp->se_wait; 755 SWAP(char *, sep->se_user, cp->se_user); 756 SWAP(char *, sep->se_group, cp->se_group); 757 SWAP(char *, sep->se_server, cp->se_server); 758 for (i = 0; i < MAXARGV; i++) 759 SWAP(char *, sep->se_argv[i], cp->se_argv[i]); 760 SWAP(int, cp->se_type, sep->se_type); 761 SWAP(int, cp->se_max, sep->se_max); 762 #undef SWAP 763 if (isrpcservice(sep)) 764 unregister_rpc(sep); 765 sep->se_rpcversl = cp->se_rpcversl; 766 sep->se_rpcversh = cp->se_rpcversh; 767 sigsetmask(omask); 768 freeconfig(cp); 769 if (debug) 770 print_service("REDO", sep); 771 } else { 772 sep = enter(cp); 773 if (debug) 774 print_service("ADD ", sep); 775 } 776 sep->se_checked = 1; 777 778 switch (sep->se_family) { 779 case AF_UNIX: 780 if (sep->se_fd != -1) 781 break; 782 n = strlen(sep->se_service); 783 if (n > sizeof(sep->se_ctrladdr_un.sun_path)) { 784 syslog(LOG_ERR, "%s: address too long", 785 sep->se_service); 786 sep->se_checked = 0; 787 continue; 788 } 789 (void)unlink(sep->se_service); 790 strncpy(sep->se_ctrladdr_un.sun_path, 791 sep->se_service, n); 792 sep->se_ctrladdr_un.sun_family = AF_UNIX; 793 sep->se_ctrladdr_size = n + 794 sizeof(sep->se_ctrladdr_un) - 795 sizeof(sep->se_ctrladdr_un.sun_path); 796 if (!ISMUX(sep)) 797 setup(sep); 798 break; 799 case AF_INET: 800 sep->se_ctrladdr_in.sin_family = AF_INET; 801 if (!strcmp(sep->se_hostaddr,"*")) 802 sep->se_ctrladdr_in.sin_addr.s_addr = 803 INADDR_ANY; 804 else if (!inet_aton(sep->se_hostaddr, 805 &sep->se_ctrladdr_in.sin_addr)) { 806 /* Do we really want to support hostname lookups here? */ 807 struct hostent *hp; 808 hp = gethostbyname(sep->se_hostaddr); 809 if (hp == 0) { 810 syslog(LOG_ERR, "%s: unknown host", 811 sep->se_hostaddr); 812 sep->se_checked = 0; 813 continue; 814 } else if (hp->h_addrtype != AF_INET) { 815 syslog(LOG_ERR, 816 "%s: address isn't an Internet address", 817 sep->se_hostaddr); 818 sep->se_checked = 0; 819 continue; 820 } else if (hp->h_length != sizeof(struct in_addr)) { 821 syslog(LOG_ERR, 822 "%s: address size wrong (under DNS corruption attack?)", 823 sep->se_hostaddr); 824 sep->se_checked = 0; 825 continue; 826 } else { 827 memcpy(&sep->se_ctrladdr_in.sin_addr, 828 hp->h_addr_list[0], 829 sizeof(struct in_addr)); 830 } 831 } 832 if (ISMUX(sep)) { 833 sep->se_fd = -1; 834 continue; 835 } 836 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr_in); 837 if (isrpcservice(sep)) { 838 struct rpcent *rp; 839 840 sep->se_rpcprog = atoi(sep->se_service); 841 if (sep->se_rpcprog == 0) { 842 rp = getrpcbyname(sep->se_service); 843 if (rp == 0) { 844 syslog(LOG_ERR, 845 "%s/%s: unknown service", 846 sep->se_service, 847 sep->se_proto); 848 sep->se_checked = 0; 849 continue; 850 } 851 sep->se_rpcprog = rp->r_number; 852 } 853 if (sep->se_fd == -1 && !ISMUX(sep)) 854 setup(sep); 855 if (sep->se_fd != -1) 856 register_rpc(sep); 857 } else { 858 u_short port = htons(atoi(sep->se_service)); 859 860 if (!port) { 861 sp = getservbyname(sep->se_service, 862 sep->se_proto); 863 if (sp == 0) { 864 syslog(LOG_ERR, 865 "%s/%s: unknown service", 866 sep->se_service, 867 sep->se_proto); 868 sep->se_checked = 0; 869 continue; 870 } 871 port = sp->s_port; 872 } 873 if (port != sep->se_ctrladdr_in.sin_port) { 874 sep->se_ctrladdr_in.sin_port = port; 875 if (sep->se_fd >= 0) 876 close_sep(sep); 877 } 878 if (sep->se_fd == -1 && !ISMUX(sep)) 879 setup(sep); 880 } 881 } 882 } 883 endconfig(); 884 /* 885 * Purge anything not looked at above. 886 */ 887 omask = sigblock(SIGBLOCK); 888 sepp = &servtab; 889 while ((sep = *sepp)) { 890 if (sep->se_checked) { 891 sepp = &sep->se_next; 892 continue; 893 } 894 *sepp = sep->se_next; 895 if (sep->se_fd >= 0) 896 close_sep(sep); 897 if (isrpcservice(sep)) 898 unregister_rpc(sep); 899 if (sep->se_family == AF_UNIX) 900 (void)unlink(sep->se_service); 901 if (debug) 902 print_service("FREE", sep); 903 freeconfig(sep); 904 free((char *)sep); 905 } 906 (void) sigsetmask(omask); 907 } 908 909 void 910 retry(signo) 911 int signo; 912 { 913 struct servtab *sep; 914 915 timingout = 0; 916 for (sep = servtab; sep; sep = sep->se_next) { 917 if (sep->se_fd == -1 && !ISMUX(sep)) { 918 switch (sep->se_family) { 919 case AF_UNIX: 920 case AF_INET: 921 setup(sep); 922 if (sep->se_fd != -1 && isrpcservice(sep)) 923 register_rpc(sep); 924 break; 925 } 926 } 927 } 928 } 929 930 void 931 goaway(signo) 932 int signo; 933 { 934 struct servtab *sep; 935 936 for (sep = servtab; sep; sep = sep->se_next) { 937 if (sep->se_fd == -1) 938 continue; 939 940 switch (sep->se_family) { 941 case AF_UNIX: 942 (void)unlink(sep->se_service); 943 break; 944 case AF_INET: 945 if (sep->se_wait == 1 && isrpcservice(sep)) 946 unregister_rpc(sep); 947 break; 948 } 949 (void)close(sep->se_fd); 950 } 951 (void)unlink(_PATH_INETDPID); 952 exit(0); 953 } 954 955 void 956 setup(sep) 957 struct servtab *sep; 958 { 959 int on = 1; 960 961 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) { 962 if (debug) 963 fprintf(stderr, "socket failed on %s/%s: %s\n", 964 sep->se_service, sep->se_proto, strerror(errno)); 965 syslog(LOG_ERR, "%s/%s: socket: %m", 966 sep->se_service, sep->se_proto); 967 return; 968 } 969 /* Set all listening sockets to non-blocking and close-on-exec. */ 970 if (fcntl(sep->se_fd, F_SETFL, O_NONBLOCK) < 0) 971 syslog(LOG_ERR, "fcntl (F_SETFL, O_NONBLOCK): %m"); 972 if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) 973 syslog(LOG_ERR, "fcntl (F_SETFD, FD_CLOEXEC): %m"); 974 #define turnon(fd, opt) \ 975 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 976 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 977 turnon(sep->se_fd, SO_DEBUG) < 0) 978 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 979 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 980 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 981 #undef turnon 982 if (bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size) < 0) { 983 if (debug) 984 fprintf(stderr, "bind failed on %s/%s: %s\n", 985 sep->se_service, sep->se_proto, strerror(errno)); 986 syslog(LOG_ERR, "%s/%s: bind: %m", 987 sep->se_service, sep->se_proto); 988 (void) close(sep->se_fd); 989 sep->se_fd = -1; 990 if (!timingout) { 991 timingout = 1; 992 alarm(RETRYTIME); 993 } 994 return; 995 } 996 if (sep->se_socktype == SOCK_STREAM) 997 listen(sep->se_fd, 10); 998 999 FD_SET(sep->se_fd, &allsock); 1000 nsock++; 1001 if (sep->se_fd > maxsock) { 1002 maxsock = sep->se_fd; 1003 if (maxsock > rlim_ofile_cur - FD_MARGIN) 1004 bump_nofile(); 1005 } 1006 if (debug) 1007 fprintf(stderr, "registered %s on %d\n", 1008 sep->se_server, sep->se_fd); 1009 } 1010 1011 /* 1012 * Finish with a service and its socket. 1013 */ 1014 void 1015 close_sep(sep) 1016 struct servtab *sep; 1017 { 1018 if (sep->se_fd >= 0) { 1019 nsock--; 1020 FD_CLR(sep->se_fd, &allsock); 1021 (void) close(sep->se_fd); 1022 sep->se_fd = -1; 1023 } 1024 sep->se_count = 0; 1025 /* 1026 * Don't keep the pid of this running deamon: when reapchild() 1027 * reaps this pid, it would erroneously increment nsock. 1028 */ 1029 if (sep->se_wait > 1) 1030 sep->se_wait = 1; 1031 } 1032 1033 void 1034 register_rpc(sep) 1035 struct servtab *sep; 1036 { 1037 #ifdef RPC 1038 int n; 1039 struct sockaddr_in sin; 1040 struct protoent *pp; 1041 1042 if ((pp = getprotobyname(sep->se_proto+4)) == NULL) { 1043 syslog(LOG_ERR, "%s: getproto: %m", 1044 sep->se_proto); 1045 return; 1046 } 1047 n = sizeof sin; 1048 if (getsockname(sep->se_fd, (struct sockaddr *)&sin, &n) < 0) { 1049 syslog(LOG_ERR, "%s/%s: getsockname: %m", 1050 sep->se_service, sep->se_proto); 1051 return; 1052 } 1053 1054 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1055 if (debug) 1056 fprintf(stderr, "pmap_set: %u %u %u %u\n", 1057 sep->se_rpcprog, n, pp->p_proto, 1058 ntohs(sin.sin_port)); 1059 (void)pmap_unset(sep->se_rpcprog, n); 1060 if (!pmap_set(sep->se_rpcprog, n, pp->p_proto, ntohs(sin.sin_port))) 1061 syslog(LOG_ERR, "pmap_set: %u %u %u %u: %m", 1062 sep->se_rpcprog, n, pp->p_proto, 1063 ntohs(sin.sin_port)); 1064 } 1065 #endif /* RPC */ 1066 } 1067 1068 void 1069 unregister_rpc(sep) 1070 struct servtab *sep; 1071 { 1072 #ifdef RPC 1073 int n; 1074 1075 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1076 if (debug) 1077 fprintf(stderr, "pmap_unset(%u, %u)\n", 1078 sep->se_rpcprog, n); 1079 if (!pmap_unset(sep->se_rpcprog, n)) 1080 syslog(LOG_ERR, "pmap_unset(%u, %u)\n", 1081 sep->se_rpcprog, n); 1082 } 1083 #endif /* RPC */ 1084 } 1085 1086 1087 struct servtab * 1088 enter(cp) 1089 struct servtab *cp; 1090 { 1091 struct servtab *sep; 1092 long omask; 1093 1094 sep = (struct servtab *)malloc(sizeof (*sep)); 1095 if (sep == (struct servtab *)0) { 1096 syslog(LOG_ERR, "Out of memory."); 1097 exit(-1); 1098 } 1099 *sep = *cp; 1100 sep->se_fd = -1; 1101 sep->se_rpcprog = -1; 1102 omask = sigblock(SIGBLOCK); 1103 sep->se_next = servtab; 1104 servtab = sep; 1105 sigsetmask(omask); 1106 return (sep); 1107 } 1108 1109 FILE *fconfig = NULL; 1110 struct servtab serv; 1111 char line[LINE_MAX]; 1112 char *defhost; 1113 1114 int 1115 setconfig() 1116 { 1117 if (defhost) free(defhost); 1118 defhost = newstr("*"); 1119 if (fconfig != NULL) { 1120 fseek(fconfig, 0L, SEEK_SET); 1121 return (1); 1122 } 1123 fconfig = fopen(CONFIG, "r"); 1124 return (fconfig != NULL); 1125 } 1126 1127 void 1128 endconfig() 1129 { 1130 if (fconfig) { 1131 (void) fclose(fconfig); 1132 fconfig = NULL; 1133 } 1134 if (defhost) { 1135 free(defhost); 1136 defhost = 0; 1137 } 1138 } 1139 1140 struct servtab * 1141 getconfigent() 1142 { 1143 struct servtab *sep = &serv; 1144 int argc; 1145 char *cp, *arg; 1146 static char TCPMUX_TOKEN[] = "tcpmux/"; 1147 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) 1148 char *hostdelim; 1149 1150 more: 1151 #ifdef MULOG 1152 while ((cp = nextline(fconfig)) && (*cp == '#' || *cp == '\0')) { 1153 /* Avoid use of `skip' if there is a danger of it looking 1154 * at continuation lines. 1155 */ 1156 do { 1157 cp++; 1158 } while (*cp == ' ' || *cp == '\t'); 1159 if (*cp == '\0') 1160 continue; 1161 if ((arg = skip(&cp)) == NULL) 1162 continue; 1163 if (strcmp(arg, "DOMAIN")) 1164 continue; 1165 if (curdom) 1166 free(curdom); 1167 curdom = NULL; 1168 while (*cp == ' ' || *cp == '\t') 1169 cp++; 1170 if (*cp == '\0') 1171 continue; 1172 arg = cp; 1173 while (*cp && *cp != ' ' && *cp != '\t') 1174 cp++; 1175 if (*cp != '\0') 1176 *cp++ = '\0'; 1177 curdom = newstr(arg); 1178 } 1179 #else 1180 while ((cp = nextline(fconfig)) && (*cp == '#' || *cp == '\0')) 1181 ; 1182 #endif 1183 if (cp == NULL) 1184 return ((struct servtab *)0); 1185 /* 1186 * clear the static buffer, since some fields (se_ctrladdr, 1187 * for example) don't get initialized here. 1188 */ 1189 memset((caddr_t)sep, 0, sizeof *sep); 1190 arg = skip(&cp); 1191 if (cp == NULL) { 1192 /* got an empty line containing just blanks/tabs. */ 1193 goto more; 1194 } 1195 /* Check for a host name. */ 1196 hostdelim = strrchr(arg, ':'); 1197 if (hostdelim) { 1198 *hostdelim = '\0'; 1199 sep->se_hostaddr = newstr(arg); 1200 arg = hostdelim + 1; 1201 /* 1202 * If the line is of the form `host:', then just change the 1203 * default host for the following lines. 1204 */ 1205 if (*arg == '\0') { 1206 arg = skip(&cp); 1207 if (cp == NULL) { 1208 free(defhost); 1209 defhost = sep->se_hostaddr; 1210 goto more; 1211 } 1212 } 1213 } else 1214 sep->se_hostaddr = newstr(defhost); 1215 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1216 char *c = arg + MUX_LEN; 1217 if (*c == '+') { 1218 sep->se_type = MUXPLUS_TYPE; 1219 c++; 1220 } else 1221 sep->se_type = MUX_TYPE; 1222 sep->se_service = newstr(c); 1223 } else { 1224 sep->se_service = newstr(arg); 1225 sep->se_type = NORM_TYPE; 1226 } 1227 1228 arg = sskip(&cp); 1229 if (strcmp(arg, "stream") == 0) 1230 sep->se_socktype = SOCK_STREAM; 1231 else if (strcmp(arg, "dgram") == 0) 1232 sep->se_socktype = SOCK_DGRAM; 1233 else if (strcmp(arg, "rdm") == 0) 1234 sep->se_socktype = SOCK_RDM; 1235 else if (strcmp(arg, "seqpacket") == 0) 1236 sep->se_socktype = SOCK_SEQPACKET; 1237 else if (strcmp(arg, "raw") == 0) 1238 sep->se_socktype = SOCK_RAW; 1239 else 1240 sep->se_socktype = -1; 1241 1242 sep->se_proto = newstr(sskip(&cp)); 1243 if (strcmp(sep->se_proto, "unix") == 0) { 1244 sep->se_family = AF_UNIX; 1245 } else { 1246 sep->se_family = AF_INET; 1247 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1248 #ifdef RPC 1249 char *cp, *ccp; 1250 cp = strchr(sep->se_service, '/'); 1251 if (cp == 0) { 1252 syslog(LOG_ERR, "%s: no rpc version", 1253 sep->se_service); 1254 goto more; 1255 } 1256 *cp++ = '\0'; 1257 sep->se_rpcversl = sep->se_rpcversh = 1258 strtol(cp, &ccp, 0); 1259 if (ccp == cp) { 1260 badafterall: 1261 syslog(LOG_ERR, "%s/%s: bad rpc version", 1262 sep->se_service, cp); 1263 goto more; 1264 } 1265 if (*ccp == '-') { 1266 cp = ccp + 1; 1267 sep->se_rpcversh = strtol(cp, &ccp, 0); 1268 if (ccp == cp) 1269 goto badafterall; 1270 } 1271 #else 1272 syslog(LOG_ERR, "%s: rpc services not suported", 1273 sep->se_service); 1274 goto more; 1275 #endif /* RPC */ 1276 } 1277 } 1278 arg = sskip(&cp); 1279 { 1280 char *cp; 1281 cp = strchr(arg, '.'); 1282 if (cp) { 1283 *cp++ = '\0'; 1284 sep->se_max = atoi(cp); 1285 } else 1286 sep->se_max = TOOMANY; 1287 } 1288 sep->se_wait = strcmp(arg, "wait") == 0; 1289 if (ISMUX(sep)) { 1290 /* 1291 * Silently enforce "nowait" for TCPMUX services since 1292 * they don't have an assigned port to listen on. 1293 */ 1294 sep->se_wait = 0; 1295 1296 if (strcmp(sep->se_proto, "tcp")) { 1297 syslog(LOG_ERR, 1298 "%s: bad protocol for tcpmux service %s", 1299 CONFIG, sep->se_service); 1300 goto more; 1301 } 1302 if (sep->se_socktype != SOCK_STREAM) { 1303 syslog(LOG_ERR, 1304 "%s: bad socket type for tcpmux service %s", 1305 CONFIG, sep->se_service); 1306 goto more; 1307 } 1308 } 1309 sep->se_user = newstr(sskip(&cp)); 1310 if ((sep->se_group = strchr(sep->se_user, '.'))) 1311 *sep->se_group++ = '\0'; 1312 sep->se_server = newstr(sskip(&cp)); 1313 if (strcmp(sep->se_server, "internal") == 0) { 1314 struct biltin *bi; 1315 1316 for (bi = biltins; bi->bi_service; bi++) 1317 if (bi->bi_socktype == sep->se_socktype && 1318 strcmp(bi->bi_service, sep->se_service) == 0) 1319 break; 1320 if (bi->bi_service == 0) { 1321 syslog(LOG_ERR, "internal service %s unknown", 1322 sep->se_service); 1323 goto more; 1324 } 1325 sep->se_bi = bi; 1326 sep->se_wait = bi->bi_wait; 1327 } else 1328 sep->se_bi = NULL; 1329 argc = 0; 1330 for (arg = skip(&cp); cp; arg = skip(&cp)) { 1331 #if MULOG 1332 char *colon; 1333 1334 if (argc == 0 && (colon = strrchr(arg, ':'))) { 1335 while (arg < colon) { 1336 int x; 1337 char *ccp; 1338 1339 switch (*arg++) { 1340 case 'l': 1341 x = 1; 1342 if (isdigit(*arg)) { 1343 x = strtol(arg, &ccp, 0); 1344 if (ccp == arg) 1345 break; 1346 arg = ccp; 1347 } 1348 sep->se_log &= ~MULOG_RFC931; 1349 sep->se_log |= x; 1350 break; 1351 case 'a': 1352 sep->se_log |= MULOG_RFC931; 1353 break; 1354 default: 1355 break; 1356 } 1357 } 1358 arg = colon + 1; 1359 } 1360 #endif 1361 if (argc < MAXARGV) 1362 sep->se_argv[argc++] = newstr(arg); 1363 } 1364 while (argc <= MAXARGV) 1365 sep->se_argv[argc++] = NULL; 1366 return (sep); 1367 } 1368 1369 void 1370 freeconfig(cp) 1371 struct servtab *cp; 1372 { 1373 int i; 1374 1375 if (cp->se_hostaddr) 1376 free(cp->se_hostaddr); 1377 if (cp->se_service) 1378 free(cp->se_service); 1379 if (cp->se_proto) 1380 free(cp->se_proto); 1381 if (cp->se_user) 1382 free(cp->se_user); 1383 /* Note: se_group is part of the newstr'ed se_user */ 1384 if (cp->se_server) 1385 free(cp->se_server); 1386 for (i = 0; i < MAXARGV; i++) 1387 if (cp->se_argv[i]) 1388 free(cp->se_argv[i]); 1389 } 1390 1391 1392 /* 1393 * Safe skip - if skip returns null, log a syntax error in the 1394 * configuration file and exit. 1395 */ 1396 char * 1397 sskip(cpp) 1398 char **cpp; 1399 { 1400 char *cp; 1401 1402 cp = skip(cpp); 1403 if (cp == NULL) { 1404 syslog(LOG_ERR, "%s: syntax error", CONFIG); 1405 exit(-1); 1406 } 1407 return (cp); 1408 } 1409 1410 char * 1411 skip(cpp) 1412 char **cpp; 1413 { 1414 char *cp = *cpp; 1415 char *start; 1416 1417 if (*cpp == NULL) 1418 return ((char *)0); 1419 1420 again: 1421 while (*cp == ' ' || *cp == '\t') 1422 cp++; 1423 if (*cp == '\0') { 1424 int c; 1425 1426 c = getc(fconfig); 1427 (void) ungetc(c, fconfig); 1428 if (c == ' ' || c == '\t') 1429 if ((cp = nextline(fconfig))) 1430 goto again; 1431 *cpp = (char *)0; 1432 return ((char *)0); 1433 } 1434 start = cp; 1435 while (*cp && *cp != ' ' && *cp != '\t') 1436 cp++; 1437 if (*cp != '\0') 1438 *cp++ = '\0'; 1439 *cpp = cp; 1440 return (start); 1441 } 1442 1443 char * 1444 nextline(fd) 1445 FILE *fd; 1446 { 1447 char *cp; 1448 1449 if (fgets(line, sizeof (line), fd) == NULL) 1450 return ((char *)0); 1451 cp = strchr(line, '\n'); 1452 if (cp) 1453 *cp = '\0'; 1454 return (line); 1455 } 1456 1457 char * 1458 newstr(cp) 1459 char *cp; 1460 { 1461 if ((cp = strdup(cp ? cp : ""))) 1462 return (cp); 1463 syslog(LOG_ERR, "strdup: %m"); 1464 exit(-1); 1465 } 1466 1467 void 1468 inetd_setproctitle(a, s) 1469 char *a; 1470 int s; 1471 { 1472 int size; 1473 char *cp; 1474 struct sockaddr_in sin; 1475 char buf[80]; 1476 1477 cp = Argv[0]; 1478 size = sizeof(sin); 1479 if (getpeername(s, (struct sockaddr *)&sin, &size) == 0) 1480 (void)snprintf(buf, sizeof buf, "-%s [%s]", a, 1481 inet_ntoa(sin.sin_addr)); 1482 else 1483 (void)snprintf(buf, sizeof buf, "-%s", a); 1484 strncpy(cp, buf, LastArg - cp); 1485 cp += strlen(cp); 1486 while (cp < LastArg) 1487 *cp++ = ' '; 1488 } 1489 1490 void 1491 logpid() 1492 { 1493 FILE *fp; 1494 1495 if ((fp = fopen(_PATH_INETDPID, "w")) != NULL) { 1496 fprintf(fp, "%u\n", getpid()); 1497 (void)fclose(fp); 1498 } 1499 } 1500 1501 void 1502 bump_nofile() 1503 { 1504 #ifdef RLIMIT_NOFILE 1505 1506 #define FD_CHUNK 32 1507 1508 struct rlimit rl; 1509 1510 if (getrlimit(RLIMIT_NOFILE, &rl) < 0) { 1511 syslog(LOG_ERR, "getrlimit: %m"); 1512 return; 1513 } 1514 rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK); 1515 if (rl.rlim_cur <= rlim_ofile_cur) { 1516 syslog(LOG_ERR, 1517 "bump_nofile: cannot extend file limit, max = %d", 1518 (int)rl.rlim_cur); 1519 return; 1520 } 1521 1522 if (setrlimit(RLIMIT_NOFILE, &rl) < 0) { 1523 syslog(LOG_ERR, "setrlimit: %m"); 1524 return; 1525 } 1526 1527 rlim_ofile_cur = rl.rlim_cur; 1528 return; 1529 1530 #else 1531 syslog(LOG_ERR, "bump_nofile: cannot extend file limit"); 1532 return; 1533 #endif 1534 } 1535 1536 /* 1537 * Internet services provided internally by inetd: 1538 */ 1539 #define BUFSIZE 4096 1540 1541 /* ARGSUSED */ 1542 void 1543 echo_stream(s, sep) /* Echo service -- echo data back */ 1544 int s; 1545 struct servtab *sep; 1546 { 1547 char buffer[BUFSIZE]; 1548 int i; 1549 1550 inetd_setproctitle(sep->se_service, s); 1551 while ((i = read(s, buffer, sizeof(buffer))) > 0 && 1552 write(s, buffer, i) > 0) 1553 ; 1554 } 1555 1556 /* ARGSUSED */ 1557 void 1558 echo_dg(s, sep) /* Echo service -- echo data back */ 1559 int s; 1560 struct servtab *sep; 1561 { 1562 char buffer[BUFSIZE]; 1563 int i, size; 1564 struct sockaddr sa; 1565 1566 size = sizeof(sa); 1567 if ((i = recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size)) < 0) 1568 return; 1569 (void) sendto(s, buffer, i, 0, &sa, sizeof(sa)); 1570 } 1571 1572 /* ARGSUSED */ 1573 void 1574 discard_stream(s, sep) /* Discard service -- ignore data */ 1575 int s; 1576 struct servtab *sep; 1577 { 1578 char buffer[BUFSIZE]; 1579 1580 inetd_setproctitle(sep->se_service, s); 1581 while ((errno = 0, read(s, buffer, sizeof(buffer)) > 0) || 1582 errno == EINTR) 1583 ; 1584 } 1585 1586 /* ARGSUSED */ 1587 void 1588 discard_dg(s, sep) /* Discard service -- ignore data */ 1589 int s; 1590 struct servtab *sep; 1591 { 1592 char buffer[BUFSIZE]; 1593 1594 (void) read(s, buffer, sizeof(buffer)); 1595 } 1596 1597 #include <ctype.h> 1598 #define LINESIZ 72 1599 char ring[128]; 1600 char *endring; 1601 1602 void 1603 initring() 1604 { 1605 int i; 1606 1607 endring = ring; 1608 1609 for (i = 0; i <= 128; ++i) 1610 if (isprint(i)) 1611 *endring++ = i; 1612 } 1613 1614 /* ARGSUSED */ 1615 void 1616 chargen_stream(s, sep) /* Character generator */ 1617 int s; 1618 struct servtab *sep; 1619 { 1620 int len; 1621 char *rs, text[LINESIZ+2]; 1622 1623 inetd_setproctitle(sep->se_service, s); 1624 1625 if (!endring) { 1626 initring(); 1627 rs = ring; 1628 } 1629 1630 text[LINESIZ] = '\r'; 1631 text[LINESIZ + 1] = '\n'; 1632 for (rs = ring;;) { 1633 if ((len = endring - rs) >= LINESIZ) 1634 memmove(text, rs, LINESIZ); 1635 else { 1636 memmove(text, rs, len); 1637 memmove(text + len, ring, LINESIZ - len); 1638 } 1639 if (++rs == endring) 1640 rs = ring; 1641 if (write(s, text, sizeof(text)) != sizeof(text)) 1642 break; 1643 } 1644 } 1645 1646 /* ARGSUSED */ 1647 void 1648 chargen_dg(s, sep) /* Character generator */ 1649 int s; 1650 struct servtab *sep; 1651 { 1652 struct sockaddr sa; 1653 static char *rs; 1654 int len, size; 1655 char text[LINESIZ+2]; 1656 1657 if (endring == 0) { 1658 initring(); 1659 rs = ring; 1660 } 1661 1662 size = sizeof(sa); 1663 if (recvfrom(s, text, sizeof(text), 0, &sa, &size) < 0) 1664 return; 1665 1666 if ((len = endring - rs) >= LINESIZ) 1667 memmove(text, rs, LINESIZ); 1668 else { 1669 memmove(text, rs, len); 1670 memmove(text + len, ring, LINESIZ - len); 1671 } 1672 if (++rs == endring) 1673 rs = ring; 1674 text[LINESIZ] = '\r'; 1675 text[LINESIZ + 1] = '\n'; 1676 (void) sendto(s, text, sizeof(text), 0, &sa, sizeof(sa)); 1677 } 1678 1679 /* 1680 * Return a machine readable date and time, in the form of the 1681 * number of seconds since midnight, Jan 1, 1900. Since gettimeofday 1682 * returns the number of seconds since midnight, Jan 1, 1970, 1683 * we must add 2208988800 seconds to this figure to make up for 1684 * some seventy years Bell Labs was asleep. 1685 */ 1686 1687 long 1688 machtime() 1689 { 1690 struct timeval tv; 1691 1692 if (gettimeofday(&tv, (struct timezone *)0) < 0) { 1693 if (debug) 1694 fprintf(stderr, "Unable to get time of day\n"); 1695 return (0L); 1696 } 1697 #define OFFSET ((u_long)25567 * 24*60*60) 1698 return (htonl((long)(tv.tv_sec + OFFSET))); 1699 #undef OFFSET 1700 } 1701 1702 /* ARGSUSED */ 1703 void 1704 machtime_stream(s, sep) 1705 int s; 1706 struct servtab *sep; 1707 { 1708 long result; 1709 1710 result = machtime(); 1711 (void) write(s, (char *) &result, sizeof(result)); 1712 } 1713 1714 /* ARGSUSED */ 1715 void 1716 machtime_dg(s, sep) 1717 int s; 1718 struct servtab *sep; 1719 { 1720 long result; 1721 struct sockaddr sa; 1722 int size; 1723 1724 size = sizeof(sa); 1725 if (recvfrom(s, (char *)&result, sizeof(result), 0, &sa, &size) < 0) 1726 return; 1727 result = machtime(); 1728 (void) sendto(s, (char *) &result, sizeof(result), 0, &sa, sizeof(sa)); 1729 } 1730 1731 /* ARGSUSED */ 1732 void 1733 daytime_stream(s, sep) /* Return human-readable time of day */ 1734 int s; 1735 struct servtab *sep; 1736 { 1737 char buffer[256]; 1738 time_t clock; 1739 int len; 1740 1741 clock = time((time_t *) 0); 1742 1743 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 1744 (void) write(s, buffer, len); 1745 } 1746 1747 /* ARGSUSED */ 1748 void 1749 daytime_dg(s, sep) /* Return human-readable time of day */ 1750 int s; 1751 struct servtab *sep; 1752 { 1753 char buffer[256]; 1754 time_t clock; 1755 struct sockaddr sa; 1756 int size, len; 1757 1758 clock = time((time_t *) 0); 1759 1760 size = sizeof(sa); 1761 if (recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size) < 0) 1762 return; 1763 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 1764 (void) sendto(s, buffer, len, 0, &sa, sizeof(sa)); 1765 } 1766 1767 /* 1768 * print_service: 1769 * Dump relevant information to stderr 1770 */ 1771 void 1772 print_service(action, sep) 1773 char *action; 1774 struct servtab *sep; 1775 { 1776 if (isrpcservice(sep)) 1777 fprintf(stderr, 1778 "%s: %s rpcprog=%d, rpcvers = %d/%d, proto=%s, wait.max=%d.%d, user.group=%s.%s builtin=%lx server=%s\n", 1779 action, sep->se_service, 1780 sep->se_rpcprog, sep->se_rpcversh, sep->se_rpcversl, sep->se_proto, 1781 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 1782 (long)sep->se_bi, sep->se_server); 1783 else 1784 fprintf(stderr, 1785 "%s: %s proto=%s, wait.max=%d.%d, user.group=%s.%s builtin=%lx server=%s\n", 1786 action, sep->se_service, sep->se_proto, 1787 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 1788 (long)sep->se_bi, sep->se_server); 1789 } 1790 1791 void 1792 usage() 1793 { 1794 1795 #ifdef LIBWRAP 1796 (void)fprintf(stderr, "usage: %s [-dl] [conf]\n", __progname); 1797 #else 1798 (void)fprintf(stderr, "usage: %s [-d] [conf]\n", __progname); 1799 #endif 1800 exit(1); 1801 } 1802 1803 1804 /* 1805 * Based on TCPMUX.C by Mark K. Lottor November 1988 1806 * sri-nic::ps:<mkl>tcpmux.c 1807 */ 1808 1809 static int /* # of characters upto \r,\n or \0 */ 1810 getline(fd, buf, len) 1811 int fd; 1812 char *buf; 1813 int len; 1814 { 1815 int count = 0, n; 1816 1817 do { 1818 n = read(fd, buf, len-count); 1819 if (n == 0) 1820 return (count); 1821 if (n < 0) 1822 return (-1); 1823 while (--n >= 0) { 1824 if (*buf == '\r' || *buf == '\n' || *buf == '\0') 1825 return (count); 1826 count++; 1827 buf++; 1828 } 1829 } while (count < len); 1830 return (count); 1831 } 1832 1833 #define MAX_SERV_LEN (256+2) /* 2 bytes for \r\n */ 1834 1835 #define strwrite(fd, buf) (void) write(fd, buf, sizeof(buf)-1) 1836 1837 void 1838 tcpmux(ctrl, sep) 1839 int ctrl; 1840 struct servtab *sep; 1841 { 1842 char service[MAX_SERV_LEN+1]; 1843 int len; 1844 1845 /* Get requested service name */ 1846 if ((len = getline(ctrl, service, MAX_SERV_LEN)) < 0) { 1847 strwrite(ctrl, "-Error reading service name\r\n"); 1848 goto reject; 1849 } 1850 service[len] = '\0'; 1851 1852 if (debug) 1853 fprintf(stderr, "tcpmux: someone wants %s\n", service); 1854 1855 /* 1856 * Help is a required command, and lists available services, 1857 * one per line. 1858 */ 1859 if (!strcasecmp(service, "help")) { 1860 strwrite(ctrl, "+Available services:\r\n"); 1861 strwrite(ctrl, "help\r\n"); 1862 for (sep = servtab; sep; sep = sep->se_next) { 1863 if (!ISMUX(sep)) 1864 continue; 1865 (void)write(ctrl, sep->se_service, 1866 strlen(sep->se_service)); 1867 strwrite(ctrl, "\r\n"); 1868 } 1869 goto reject; 1870 } 1871 1872 /* Try matching a service in inetd.conf with the request */ 1873 for (sep = servtab; sep; sep = sep->se_next) { 1874 if (!ISMUX(sep)) 1875 continue; 1876 if (!strcasecmp(service, sep->se_service)) { 1877 if (ISMUXPLUS(sep)) 1878 strwrite(ctrl, "+Go\r\n"); 1879 run_service(ctrl, sep); 1880 return; 1881 } 1882 } 1883 strwrite(ctrl, "-Service not available\r\n"); 1884 reject: 1885 _exit(1); 1886 } 1887 1888 1889 #ifdef MULOG 1890 dolog(sep, ctrl) 1891 struct servtab *sep; 1892 int ctrl; 1893 { 1894 struct sockaddr sa; 1895 struct sockaddr_in *sin = (struct sockaddr_in *)&sa; 1896 int len = sizeof(sa); 1897 struct hostent *hp; 1898 char *host, *dp, buf[BUFSIZ], *rfc931_name(); 1899 int connected = 1; 1900 1901 if (sep->se_family != AF_INET) 1902 return; 1903 1904 if (getpeername(ctrl, &sa, &len) < 0) { 1905 if (errno != ENOTCONN) { 1906 syslog(LOG_ERR, "getpeername: %m"); 1907 return; 1908 } 1909 if (recvfrom(ctrl, buf, sizeof(buf), MSG_PEEK, &sa, &len) < 0) { 1910 syslog(LOG_ERR, "recvfrom: %m"); 1911 return; 1912 } 1913 connected = 0; 1914 } 1915 if (sa.sa_family != AF_INET) { 1916 syslog(LOG_ERR, "unexpected address family %u", sa.sa_family); 1917 return; 1918 } 1919 1920 hp = gethostbyaddr((char *) &sin->sin_addr.s_addr, 1921 sizeof (sin->sin_addr.s_addr), AF_INET); 1922 1923 host = hp?hp->h_name:inet_ntoa(sin->sin_addr); 1924 1925 switch (sep->se_log & ~MULOG_RFC931) { 1926 case 0: 1927 return; 1928 case 1: 1929 if (curdom == NULL || *curdom == '\0') 1930 break; 1931 dp = host + strlen(host) - strlen(curdom); 1932 if (dp < host) 1933 break; 1934 if (debug) 1935 fprintf(stderr, "check \"%s\" against curdom \"%s\"\n", 1936 host, curdom); 1937 if (strcasecmp(dp, curdom) == 0) 1938 return; 1939 break; 1940 case 2: 1941 default: 1942 break; 1943 } 1944 1945 openlog("", LOG_NOWAIT, MULOG); 1946 1947 if (connected && (sep->se_log & MULOG_RFC931)) 1948 syslog(LOG_INFO, "%s@%s wants %s", 1949 rfc931_name(sin, ctrl), host, sep->se_service); 1950 else 1951 syslog(LOG_INFO, "%s wants %s", 1952 host, sep->se_service); 1953 } 1954 1955 /* 1956 * From tcp_log by 1957 * Wietse Venema, Eindhoven University of Technology, The Netherlands. 1958 */ 1959 #if 0 1960 static char sccsid[] = "@(#) rfc931.c 1.3 92/08/31 22:54:46"; 1961 #endif 1962 1963 #include <setjmp.h> 1964 1965 #define RFC931_PORT 113 /* Semi-well-known port */ 1966 #define TIMEOUT 4 1967 #define TIMEOUT2 10 1968 1969 static jmp_buf timebuf; 1970 1971 /* timeout - handle timeouts */ 1972 1973 static void timeout(sig) 1974 int sig; 1975 { 1976 longjmp(timebuf, sig); 1977 } 1978 1979 /* rfc931_name - return remote user name */ 1980 1981 char * 1982 rfc931_name(there, ctrl) 1983 struct sockaddr_in *there; /* remote link information */ 1984 int ctrl; 1985 { 1986 struct sockaddr_in here; /* local link information */ 1987 struct sockaddr_in sin; /* for talking to RFC931 daemon */ 1988 int length; 1989 int s; 1990 unsigned remote; 1991 unsigned local; 1992 static char user[256]; /* XXX */ 1993 char buf[256]; 1994 char *cp; 1995 char *result = "USER_UNKNOWN"; 1996 int len; 1997 1998 /* Find out local port number of our stdin. */ 1999 2000 length = sizeof(here); 2001 if (getsockname(ctrl, (struct sockaddr *) &here, &length) == -1) { 2002 syslog(LOG_ERR, "getsockname: %m"); 2003 return (result); 2004 } 2005 /* Set up timer so we won't get stuck. */ 2006 2007 if ((s = socket(AF_INET, SOCK_STREAM, 0)) == -1) { 2008 syslog(LOG_ERR, "socket: %m"); 2009 return (result); 2010 } 2011 2012 sin = here; 2013 sin.sin_port = htons(0); 2014 if (bind(s, (struct sockaddr *) &sin, sizeof(sin)) == -1) { 2015 syslog(LOG_ERR, "bind: %m"); 2016 return (result); 2017 } 2018 2019 signal(SIGALRM, timeout); 2020 if (setjmp(timebuf)) { 2021 close(s); /* not: fclose(fp) */ 2022 return (result); 2023 } 2024 alarm(TIMEOUT); 2025 2026 /* Connect to the RFC931 daemon. */ 2027 2028 sin = *there; 2029 sin.sin_port = htons(RFC931_PORT); 2030 if (connect(s, (struct sockaddr *) &sin, sizeof(sin)) == -1) { 2031 close(s); 2032 alarm(0); 2033 return (result); 2034 } 2035 2036 /* Query the RFC 931 server. Would 13-byte writes ever be broken up? */ 2037 (void)snprintf(buf, sizeof buf, "%u,%u\r\n", ntohs(there->sin_port), 2038 ntohs(here.sin_port)); 2039 2040 2041 for (len = 0, cp = buf; len < strlen(buf); ) { 2042 int n; 2043 2044 if ((n = write(s, cp, strlen(buf) - len)) == -1) { 2045 close(s); 2046 alarm(0); 2047 return (result); 2048 } 2049 cp += n; 2050 len += n; 2051 } 2052 2053 /* Read response */ 2054 for (cp = buf; cp < buf + sizeof(buf) - 1; ) { 2055 char c; 2056 if (read(s, &c, 1) != 1) { 2057 close(s); 2058 alarm(0); 2059 return (result); 2060 } 2061 if (c == '\n') 2062 break; 2063 *cp++ = c; 2064 } 2065 *cp = '\0'; 2066 2067 if (sscanf(buf, "%u , %u : USERID :%*[^:]:%255s", &remote, &local, user) == 3 2068 && ntohs(there->sin_port) == remote 2069 && ntohs(here.sin_port) == local) { 2070 2071 /* Strip trailing carriage return. */ 2072 if (cp = strchr(user, '\r')) 2073 *cp = 0; 2074 result = user; 2075 } 2076 2077 alarm(0); 2078 close(s); 2079 return (result); 2080 } 2081 #endif 2082
Indexes created Sun Oct 19 02:09:48 GMT 2025