inetd.c revision 1.37
1 /* $NetBSD: inetd.c,v 1.37 1997/10/08 07:15:59 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 1.37 1997/10/08 07:15:59 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 )) != EOF) 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); 445 446 { 447 /* space for daemons to overwrite environment for ps */ 448 #define DUMMYSIZE 100 449 char dummy[DUMMYSIZE]; 450 451 (void)memset(dummy, 'x', DUMMYSIZE - 1); 452 dummy[DUMMYSIZE - 1] = '\0'; 453 454 (void)setenv("inetd_dummy", dummy, 1); 455 } 456 457 for (;;) { 458 int n, ctrl; 459 fd_set readable; 460 461 if (nsock == 0) { 462 (void) sigblock(SIGBLOCK); 463 while (nsock == 0) 464 sigpause(0L); 465 (void) sigsetmask(0L); 466 } 467 readable = allsock; 468 if ((n = select(maxsock + 1, &readable, (fd_set *)0, 469 (fd_set *)0, (struct timeval *)0)) <= 0) { 470 if (n == -1 && errno != EINTR) { 471 syslog(LOG_WARNING, "select: %m"); 472 sleep(1); 473 } 474 continue; 475 } 476 for (sep = servtab; n && sep; sep = nsep) { 477 nsep = sep->se_next; 478 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) { 479 n--; 480 if (debug) 481 fprintf(stderr, "someone wants %s\n", sep->se_service); 482 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 483 /* XXX here do the libwrap check-before-accept */ 484 ctrl = accept(sep->se_fd, (struct sockaddr *)0, 485 (int *)0); 486 if (debug) 487 fprintf(stderr, "accept, ctrl %d\n", ctrl); 488 if (ctrl < 0) { 489 if (errno != EINTR) 490 syslog(LOG_WARNING, 491 "accept (for %s): %m", 492 sep->se_service); 493 continue; 494 } 495 } else 496 ctrl = sep->se_fd; 497 (void) sigblock(SIGBLOCK); 498 pid = 0; 499 #ifdef LIBWRAP_INTERNAL 500 dofork = 1; 501 #else 502 dofork = (sep->se_bi == 0 || sep->se_bi->bi_fork); 503 #endif 504 if (dofork) { 505 if (sep->se_count++ == 0) 506 (void)gettimeofday(&sep->se_time, 507 (struct timezone *)0); 508 else if (sep->se_count >= sep->se_max) { 509 struct timeval now; 510 511 (void)gettimeofday(&now, (struct timezone *)0); 512 if (now.tv_sec - sep->se_time.tv_sec > 513 CNT_INTVL) { 514 sep->se_time = now; 515 sep->se_count = 1; 516 } else { 517 syslog(LOG_ERR, 518 "%s/%s server failing (looping), service terminated\n", 519 sep->se_service, sep->se_proto); 520 close_sep(sep); 521 sigsetmask(0L); 522 if (!timingout) { 523 timingout = 1; 524 alarm(RETRYTIME); 525 } 526 continue; 527 } 528 } 529 pid = fork(); 530 if (pid < 0) { 531 syslog(LOG_ERR, "fork: %m"); 532 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 533 close(ctrl); 534 sigsetmask(0L); 535 sleep(1); 536 continue; 537 } 538 if (pid != 0 && sep->se_wait) { 539 sep->se_wait = pid; 540 FD_CLR(sep->se_fd, &allsock); 541 nsock--; 542 } 543 if (pid == 0 && debug) 544 setsid(); 545 } 546 sigsetmask(0L); 547 if (pid == 0) { 548 run_service(ctrl, sep); 549 if (dofork) 550 exit(0); 551 } 552 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 553 close(ctrl); 554 } 555 } 556 } 557 } 558 559 void 560 run_service(ctrl, sep) 561 int ctrl; 562 struct servtab *sep; 563 { 564 struct passwd *pwd; 565 struct group *grp = NULL; /* XXX gcc */ 566 #ifdef LIBWRAP 567 struct request_info req; 568 int denied; 569 char buf[7], *service = NULL; /* XXX gcc */ 570 #endif 571 572 #ifdef LIBWRAP 573 #ifndef LIBWRAP_INTERNAL 574 if (sep->se_bi == 0) 575 #endif 576 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 577 request_init(&req, RQ_DAEMON, sep->se_argv[0] ? 578 sep->se_argv[0] : sep->se_service, RQ_FILE, ctrl, NULL); 579 fromhost(&req); 580 denied = !hosts_access(&req); 581 if (denied || lflag) { 582 sp = getservbyport(sep->se_ctrladdr_in.sin_port, 583 sep->se_proto); 584 if (sp == NULL) { 585 (void)snprintf(buf, sizeof buf, "%d", 586 ntohs(sep->se_ctrladdr_in.sin_port)); 587 service = buf; 588 } else 589 service = sp->s_name; 590 } 591 if (denied) { 592 syslog(deny_severity, 593 "refused connection from %.500s, service %s (%s)", 594 eval_client(&req), service, sep->se_proto); 595 goto reject; 596 } 597 if (lflag) { 598 syslog(allow_severity, 599 "connection from %.500s, service %s (%s)", 600 eval_client(&req), service, sep->se_proto); 601 } 602 } 603 #endif /* LIBWRAP */ 604 605 if (sep->se_bi) { 606 (*sep->se_bi->bi_fn)(ctrl, sep); 607 } else { 608 if ((pwd = getpwnam(sep->se_user)) == NULL) { 609 syslog(LOG_ERR, "%s/%s: %s: No such user", 610 sep->se_service, sep->se_proto, sep->se_user); 611 goto reject; 612 } 613 if (sep->se_group && 614 (grp = getgrnam(sep->se_group)) == NULL) { 615 syslog(LOG_ERR, "%s/%s: %s: No such group", 616 sep->se_service, sep->se_proto, sep->se_group); 617 goto reject; 618 } 619 if (pwd->pw_uid) { 620 if (sep->se_group) 621 pwd->pw_gid = grp->gr_gid; 622 if (setgid(pwd->pw_gid) < 0) { 623 syslog(LOG_ERR, 624 "%s/%s: can't set gid %d: %m", sep->se_service, 625 sep->se_proto, pwd->pw_gid); 626 goto reject; 627 } 628 (void) initgroups(pwd->pw_name, 629 pwd->pw_gid); 630 if (setuid(pwd->pw_uid) < 0) { 631 syslog(LOG_ERR, 632 "%s/%s: can't set uid %d: %m", sep->se_service, 633 sep->se_proto, pwd->pw_uid); 634 goto reject; 635 } 636 } else if (sep->se_group) { 637 (void) setgid((gid_t)grp->gr_gid); 638 } 639 if (debug) 640 fprintf(stderr, "%d execl %s\n", 641 getpid(), sep->se_server); 642 #ifdef MULOG 643 if (sep->se_log) 644 dolog(sep, ctrl); 645 #endif 646 /* Set our control descriptor to not close-on-exec... */ 647 if (fcntl(ctrl, F_SETFD, 0) < 0) 648 syslog(LOG_ERR, "fcntl (F_SETFD, 0): %m"); 649 /* ...and dup it to stdin, stdout, and stderr. */ 650 if (ctrl != 0) { 651 dup2(ctrl, 0); 652 close(ctrl); 653 ctrl = 0; 654 } 655 dup2(0, 1); 656 dup2(0, 2); 657 #ifdef RLIMIT_NOFILE 658 if (rlim_ofile.rlim_cur != rlim_ofile_cur && 659 setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) 660 syslog(LOG_ERR, "setrlimit: %m"); 661 #endif 662 execv(sep->se_server, sep->se_argv); 663 syslog(LOG_ERR, "cannot execute %s: %m", sep->se_server); 664 reject: 665 if (sep->se_socktype != SOCK_STREAM) 666 recv(ctrl, buf, sizeof (buf), 0); 667 _exit(1); 668 } 669 } 670 671 void 672 reapchild(signo) 673 int signo; 674 { 675 int status; 676 pid_t pid; 677 struct servtab *sep; 678 679 for (;;) { 680 pid = wait3(&status, WNOHANG, (struct rusage *)0); 681 if (pid <= 0) 682 break; 683 if (debug) 684 fprintf(stderr, "%d reaped, status %#x\n", 685 pid, status); 686 for (sep = servtab; sep; sep = sep->se_next) 687 if (sep->se_wait == pid) { 688 if (WIFEXITED(status) && WEXITSTATUS(status)) 689 syslog(LOG_WARNING, 690 "%s: exit status 0x%x", 691 sep->se_server, WEXITSTATUS(status)); 692 else if (WIFSIGNALED(status)) 693 syslog(LOG_WARNING, 694 "%s: exit signal 0x%x", 695 sep->se_server, WTERMSIG(status)); 696 sep->se_wait = 1; 697 FD_SET(sep->se_fd, &allsock); 698 nsock++; 699 if (debug) 700 fprintf(stderr, "restored %s, fd %d\n", 701 sep->se_service, sep->se_fd); 702 } 703 } 704 } 705 706 void 707 config(signo) 708 int signo; 709 { 710 struct servtab *sep, *cp, **sepp; 711 long omask; 712 int n; 713 714 if (!setconfig()) { 715 syslog(LOG_ERR, "%s: %m", CONFIG); 716 return; 717 } 718 for (sep = servtab; sep; sep = sep->se_next) 719 sep->se_checked = 0; 720 while ((cp = getconfigent())) { 721 for (sep = servtab; sep; sep = sep->se_next) 722 if (strcmp(sep->se_service, cp->se_service) == 0 && 723 strcmp(sep->se_hostaddr, cp->se_hostaddr) == 0 && 724 strcmp(sep->se_proto, cp->se_proto) == 0 && 725 ISMUX(sep) == ISMUX(cp)) 726 break; 727 if (sep != 0) { 728 int i; 729 730 #define SWAP(type, a, b) {type c=(type)a; (type)a=(type)b; (type)b=(type)c;} 731 732 omask = sigblock(SIGBLOCK); 733 /* 734 * sep->se_wait may be holding the pid of a daemon 735 * that we're waiting for. If so, don't overwrite 736 * it unless the config file explicitly says don't 737 * wait. 738 */ 739 if (cp->se_bi == 0 && 740 (sep->se_wait == 1 || cp->se_wait == 0)) 741 sep->se_wait = cp->se_wait; 742 SWAP(char *, sep->se_user, cp->se_user); 743 SWAP(char *, sep->se_group, cp->se_group); 744 SWAP(char *, sep->se_server, cp->se_server); 745 for (i = 0; i < MAXARGV; i++) 746 SWAP(char *, sep->se_argv[i], cp->se_argv[i]); 747 SWAP(int, cp->se_type, sep->se_type); 748 SWAP(int, cp->se_max, sep->se_max); 749 #undef SWAP 750 if (isrpcservice(sep)) 751 unregister_rpc(sep); 752 sep->se_rpcversl = cp->se_rpcversl; 753 sep->se_rpcversh = cp->se_rpcversh; 754 sigsetmask(omask); 755 freeconfig(cp); 756 if (debug) 757 print_service("REDO", sep); 758 } else { 759 sep = enter(cp); 760 if (debug) 761 print_service("ADD ", sep); 762 } 763 sep->se_checked = 1; 764 765 switch (sep->se_family) { 766 case AF_UNIX: 767 if (sep->se_fd != -1) 768 break; 769 (void)unlink(sep->se_service); 770 n = strlen(sep->se_service); 771 if (n > sizeof(sep->se_ctrladdr_un.sun_path) - 1) 772 n = sizeof(sep->se_ctrladdr_un.sun_path) - 1; 773 strncpy(sep->se_ctrladdr_un.sun_path, 774 sep->se_service, n); 775 sep->se_ctrladdr_un.sun_family = AF_UNIX; 776 sep->se_ctrladdr_size = n + 777 sizeof(sep->se_ctrladdr_un) - 778 sizeof(sep->se_ctrladdr_un.sun_path); 779 if (!ISMUX(sep)) 780 setup(sep); 781 break; 782 case AF_INET: 783 sep->se_ctrladdr_in.sin_family = AF_INET; 784 if (!strcmp(sep->se_hostaddr,"*")) 785 sep->se_ctrladdr_in.sin_addr.s_addr = 786 INADDR_ANY; 787 else if (!inet_aton(sep->se_hostaddr, 788 &sep->se_ctrladdr_in.sin_addr)) { 789 /* Do we really want to support hostname lookups here? */ 790 struct hostent *hp; 791 hp = gethostbyname(sep->se_hostaddr); 792 if (hp == 0) { 793 syslog(LOG_ERR, "%s: unknown host", 794 sep->se_hostaddr); 795 sep->se_checked = 0; 796 continue; 797 } else if (hp->h_addrtype != AF_INET) { 798 syslog(LOG_ERR, 799 "%s: address isn't an Internet address", 800 sep->se_hostaddr); 801 sep->se_checked = 0; 802 continue; 803 } else if (hp->h_length != sizeof(struct in_addr)) { 804 syslog(LOG_ERR, 805 "%s: address size wrong (under DNS corruption attack?)", 806 sep->se_hostaddr); 807 sep->se_checked = 0; 808 continue; 809 } else { 810 memcpy(&sep->se_ctrladdr_in.sin_addr, 811 hp->h_addr_list[0], 812 sizeof(struct in_addr)); 813 } 814 } 815 if (ISMUX(sep)) { 816 sep->se_fd = -1; 817 continue; 818 } 819 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr_in); 820 if (isrpcservice(sep)) { 821 struct rpcent *rp; 822 823 sep->se_rpcprog = atoi(sep->se_service); 824 if (sep->se_rpcprog == 0) { 825 rp = getrpcbyname(sep->se_service); 826 if (rp == 0) { 827 syslog(LOG_ERR, 828 "%s/%s: unknown service", 829 sep->se_service, 830 sep->se_proto); 831 sep->se_checked = 0; 832 continue; 833 } 834 sep->se_rpcprog = rp->r_number; 835 } 836 if (sep->se_fd == -1 && !ISMUX(sep)) 837 setup(sep); 838 if (sep->se_fd != -1) 839 register_rpc(sep); 840 } else { 841 u_short port = htons(atoi(sep->se_service)); 842 843 if (!port) { 844 sp = getservbyname(sep->se_service, 845 sep->se_proto); 846 if (sp == 0) { 847 syslog(LOG_ERR, 848 "%s/%s: unknown service", 849 sep->se_service, 850 sep->se_proto); 851 sep->se_checked = 0; 852 continue; 853 } 854 port = sp->s_port; 855 } 856 if (port != sep->se_ctrladdr_in.sin_port) { 857 sep->se_ctrladdr_in.sin_port = port; 858 if (sep->se_fd >= 0) 859 close_sep(sep); 860 } 861 if (sep->se_fd == -1 && !ISMUX(sep)) 862 setup(sep); 863 } 864 } 865 } 866 endconfig(); 867 /* 868 * Purge anything not looked at above. 869 */ 870 omask = sigblock(SIGBLOCK); 871 sepp = &servtab; 872 while ((sep = *sepp)) { 873 if (sep->se_checked) { 874 sepp = &sep->se_next; 875 continue; 876 } 877 *sepp = sep->se_next; 878 if (sep->se_fd >= 0) 879 close_sep(sep); 880 if (isrpcservice(sep)) 881 unregister_rpc(sep); 882 if (sep->se_family == AF_UNIX) 883 (void)unlink(sep->se_service); 884 if (debug) 885 print_service("FREE", sep); 886 freeconfig(sep); 887 free((char *)sep); 888 } 889 (void) sigsetmask(omask); 890 } 891 892 void 893 retry(signo) 894 int signo; 895 { 896 struct servtab *sep; 897 898 timingout = 0; 899 for (sep = servtab; sep; sep = sep->se_next) { 900 if (sep->se_fd == -1 && !ISMUX(sep)) { 901 switch (sep->se_family) { 902 case AF_UNIX: 903 case AF_INET: 904 setup(sep); 905 if (sep->se_fd != -1 && isrpcservice(sep)) 906 register_rpc(sep); 907 break; 908 } 909 } 910 } 911 } 912 913 void 914 goaway(signo) 915 int signo; 916 { 917 struct servtab *sep; 918 919 for (sep = servtab; sep; sep = sep->se_next) { 920 if (sep->se_fd == -1) 921 continue; 922 923 switch (sep->se_family) { 924 case AF_UNIX: 925 (void)unlink(sep->se_service); 926 break; 927 case AF_INET: 928 if (sep->se_wait == 1 && isrpcservice(sep)) 929 unregister_rpc(sep); 930 break; 931 } 932 (void)close(sep->se_fd); 933 } 934 (void)unlink(_PATH_INETDPID); 935 exit(0); 936 } 937 938 void 939 setup(sep) 940 struct servtab *sep; 941 { 942 int on = 1; 943 944 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) { 945 if (debug) 946 fprintf(stderr, "socket failed on %s/%s: %s\n", 947 sep->se_service, sep->se_proto, strerror(errno)); 948 syslog(LOG_ERR, "%s/%s: socket: %m", 949 sep->se_service, sep->se_proto); 950 return; 951 } 952 /* Set all listening sockets to close-on-exec. */ 953 if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) 954 syslog(LOG_ERR, "fcntl (F_SETFD, FD_CLOEXEC): %m"); 955 #define turnon(fd, opt) \ 956 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 957 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 958 turnon(sep->se_fd, SO_DEBUG) < 0) 959 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 960 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 961 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 962 #undef turnon 963 if (bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size) < 0) { 964 if (debug) 965 fprintf(stderr, "bind failed on %s/%s: %s\n", 966 sep->se_service, sep->se_proto, strerror(errno)); 967 syslog(LOG_ERR, "%s/%s: bind: %m", 968 sep->se_service, sep->se_proto); 969 (void) close(sep->se_fd); 970 sep->se_fd = -1; 971 if (!timingout) { 972 timingout = 1; 973 alarm(RETRYTIME); 974 } 975 return; 976 } 977 if (sep->se_socktype == SOCK_STREAM) 978 listen(sep->se_fd, 10); 979 980 FD_SET(sep->se_fd, &allsock); 981 nsock++; 982 if (sep->se_fd > maxsock) { 983 maxsock = sep->se_fd; 984 if (maxsock > rlim_ofile_cur - FD_MARGIN) 985 bump_nofile(); 986 } 987 if (debug) 988 fprintf(stderr, "registered %s on %d\n", 989 sep->se_server, sep->se_fd); 990 } 991 992 /* 993 * Finish with a service and its socket. 994 */ 995 void 996 close_sep(sep) 997 struct servtab *sep; 998 { 999 if (sep->se_fd >= 0) { 1000 nsock--; 1001 FD_CLR(sep->se_fd, &allsock); 1002 (void) close(sep->se_fd); 1003 sep->se_fd = -1; 1004 } 1005 sep->se_count = 0; 1006 /* 1007 * Don't keep the pid of this running deamon: when reapchild() 1008 * reaps this pid, it would erroneously increment nsock. 1009 */ 1010 if (sep->se_wait > 1) 1011 sep->se_wait = 1; 1012 } 1013 1014 void 1015 register_rpc(sep) 1016 struct servtab *sep; 1017 { 1018 #ifdef RPC 1019 int n; 1020 struct sockaddr_in sin; 1021 struct protoent *pp; 1022 1023 if ((pp = getprotobyname(sep->se_proto+4)) == NULL) { 1024 syslog(LOG_ERR, "%s: getproto: %m", 1025 sep->se_proto); 1026 return; 1027 } 1028 n = sizeof sin; 1029 if (getsockname(sep->se_fd, (struct sockaddr *)&sin, &n) < 0) { 1030 syslog(LOG_ERR, "%s/%s: getsockname: %m", 1031 sep->se_service, sep->se_proto); 1032 return; 1033 } 1034 1035 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1036 if (debug) 1037 fprintf(stderr, "pmap_set: %u %u %u %u\n", 1038 sep->se_rpcprog, n, pp->p_proto, 1039 ntohs(sin.sin_port)); 1040 (void)pmap_unset(sep->se_rpcprog, n); 1041 if (!pmap_set(sep->se_rpcprog, n, pp->p_proto, ntohs(sin.sin_port))) 1042 syslog(LOG_ERR, "pmap_set: %u %u %u %u: %m", 1043 sep->se_rpcprog, n, pp->p_proto, 1044 ntohs(sin.sin_port)); 1045 } 1046 #endif /* RPC */ 1047 } 1048 1049 void 1050 unregister_rpc(sep) 1051 struct servtab *sep; 1052 { 1053 #ifdef RPC 1054 int n; 1055 1056 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1057 if (debug) 1058 fprintf(stderr, "pmap_unset(%u, %u)\n", 1059 sep->se_rpcprog, n); 1060 if (!pmap_unset(sep->se_rpcprog, n)) 1061 syslog(LOG_ERR, "pmap_unset(%u, %u)\n", 1062 sep->se_rpcprog, n); 1063 } 1064 #endif /* RPC */ 1065 } 1066 1067 1068 struct servtab * 1069 enter(cp) 1070 struct servtab *cp; 1071 { 1072 struct servtab *sep; 1073 long omask; 1074 1075 sep = (struct servtab *)malloc(sizeof (*sep)); 1076 if (sep == (struct servtab *)0) { 1077 syslog(LOG_ERR, "Out of memory."); 1078 exit(-1); 1079 } 1080 *sep = *cp; 1081 sep->se_fd = -1; 1082 sep->se_rpcprog = -1; 1083 omask = sigblock(SIGBLOCK); 1084 sep->se_next = servtab; 1085 servtab = sep; 1086 sigsetmask(omask); 1087 return (sep); 1088 } 1089 1090 FILE *fconfig = NULL; 1091 struct servtab serv; 1092 char line[LINE_MAX]; 1093 char *defhost; 1094 1095 int 1096 setconfig() 1097 { 1098 if (defhost) free(defhost); 1099 defhost = newstr("*"); 1100 if (fconfig != NULL) { 1101 fseek(fconfig, 0L, SEEK_SET); 1102 return (1); 1103 } 1104 fconfig = fopen(CONFIG, "r"); 1105 return (fconfig != NULL); 1106 } 1107 1108 void 1109 endconfig() 1110 { 1111 if (fconfig) { 1112 (void) fclose(fconfig); 1113 fconfig = NULL; 1114 } 1115 if (defhost) { 1116 free(defhost); 1117 defhost = 0; 1118 } 1119 } 1120 1121 struct servtab * 1122 getconfigent() 1123 { 1124 struct servtab *sep = &serv; 1125 int argc; 1126 char *cp, *arg; 1127 static char TCPMUX_TOKEN[] = "tcpmux/"; 1128 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) 1129 char *hostdelim; 1130 1131 more: 1132 #ifdef MULOG 1133 while ((cp = nextline(fconfig)) && (*cp == '#' || *cp == '\0')) { 1134 /* Avoid use of `skip' if there is a danger of it looking 1135 * at continuation lines. 1136 */ 1137 do { 1138 cp++; 1139 } while (*cp == ' ' || *cp == '\t'); 1140 if (*cp == '\0') 1141 continue; 1142 if ((arg = skip(&cp)) == NULL) 1143 continue; 1144 if (strcmp(arg, "DOMAIN")) 1145 continue; 1146 if (curdom) 1147 free(curdom); 1148 curdom = NULL; 1149 while (*cp == ' ' || *cp == '\t') 1150 cp++; 1151 if (*cp == '\0') 1152 continue; 1153 arg = cp; 1154 while (*cp && *cp != ' ' && *cp != '\t') 1155 cp++; 1156 if (*cp != '\0') 1157 *cp++ = '\0'; 1158 curdom = newstr(arg); 1159 } 1160 #else 1161 while ((cp = nextline(fconfig)) && (*cp == '#' || *cp == '\0')) 1162 ; 1163 #endif 1164 if (cp == NULL) 1165 return ((struct servtab *)0); 1166 /* 1167 * clear the static buffer, since some fields (se_ctrladdr, 1168 * for example) don't get initialized here. 1169 */ 1170 memset((caddr_t)sep, 0, sizeof *sep); 1171 arg = skip(&cp); 1172 if (cp == NULL) { 1173 /* got an empty line containing just blanks/tabs. */ 1174 goto more; 1175 } 1176 /* Check for a host name. */ 1177 hostdelim = strrchr(arg, ':'); 1178 if (hostdelim) { 1179 *hostdelim = '\0'; 1180 sep->se_hostaddr = newstr(arg); 1181 arg = hostdelim + 1; 1182 /* 1183 * If the line is of the form `host:', then just change the 1184 * default host for the following lines. 1185 */ 1186 if (*arg == '\0') { 1187 arg = skip(&cp); 1188 if (cp == NULL) { 1189 free(defhost); 1190 defhost = sep->se_hostaddr; 1191 goto more; 1192 } 1193 } 1194 } else 1195 sep->se_hostaddr = newstr(defhost); 1196 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1197 char *c = arg + MUX_LEN; 1198 if (*c == '+') { 1199 sep->se_type = MUXPLUS_TYPE; 1200 c++; 1201 } else 1202 sep->se_type = MUX_TYPE; 1203 sep->se_service = newstr(c); 1204 } else { 1205 sep->se_service = newstr(arg); 1206 sep->se_type = NORM_TYPE; 1207 } 1208 1209 arg = sskip(&cp); 1210 if (strcmp(arg, "stream") == 0) 1211 sep->se_socktype = SOCK_STREAM; 1212 else if (strcmp(arg, "dgram") == 0) 1213 sep->se_socktype = SOCK_DGRAM; 1214 else if (strcmp(arg, "rdm") == 0) 1215 sep->se_socktype = SOCK_RDM; 1216 else if (strcmp(arg, "seqpacket") == 0) 1217 sep->se_socktype = SOCK_SEQPACKET; 1218 else if (strcmp(arg, "raw") == 0) 1219 sep->se_socktype = SOCK_RAW; 1220 else 1221 sep->se_socktype = -1; 1222 1223 sep->se_proto = newstr(sskip(&cp)); 1224 if (strcmp(sep->se_proto, "unix") == 0) { 1225 sep->se_family = AF_UNIX; 1226 } else { 1227 sep->se_family = AF_INET; 1228 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1229 #ifdef RPC 1230 char *cp, *ccp; 1231 cp = strchr(sep->se_service, '/'); 1232 if (cp == 0) { 1233 syslog(LOG_ERR, "%s: no rpc version", 1234 sep->se_service); 1235 goto more; 1236 } 1237 *cp++ = '\0'; 1238 sep->se_rpcversl = sep->se_rpcversh = 1239 strtol(cp, &ccp, 0); 1240 if (ccp == cp) { 1241 badafterall: 1242 syslog(LOG_ERR, "%s/%s: bad rpc version", 1243 sep->se_service, cp); 1244 goto more; 1245 } 1246 if (*ccp == '-') { 1247 cp = ccp + 1; 1248 sep->se_rpcversh = strtol(cp, &ccp, 0); 1249 if (ccp == cp) 1250 goto badafterall; 1251 } 1252 #else 1253 syslog(LOG_ERR, "%s: rpc services not suported", 1254 sep->se_service); 1255 goto more; 1256 #endif /* RPC */ 1257 } 1258 } 1259 arg = sskip(&cp); 1260 { 1261 char *cp; 1262 cp = strchr(arg, '.'); 1263 if (cp) { 1264 *cp++ = '\0'; 1265 sep->se_max = atoi(cp); 1266 } else 1267 sep->se_max = TOOMANY; 1268 } 1269 sep->se_wait = strcmp(arg, "wait") == 0; 1270 if (ISMUX(sep)) { 1271 /* 1272 * Silently enforce "nowait" for TCPMUX services since 1273 * they don't have an assigned port to listen on. 1274 */ 1275 sep->se_wait = 0; 1276 1277 if (strcmp(sep->se_proto, "tcp")) { 1278 syslog(LOG_ERR, 1279 "%s: bad protocol for tcpmux service %s", 1280 CONFIG, sep->se_service); 1281 goto more; 1282 } 1283 if (sep->se_socktype != SOCK_STREAM) { 1284 syslog(LOG_ERR, 1285 "%s: bad socket type for tcpmux service %s", 1286 CONFIG, sep->se_service); 1287 goto more; 1288 } 1289 } 1290 sep->se_user = newstr(sskip(&cp)); 1291 if ((sep->se_group = strchr(sep->se_user, '.'))) 1292 *sep->se_group++ = '\0'; 1293 sep->se_server = newstr(sskip(&cp)); 1294 if (strcmp(sep->se_server, "internal") == 0) { 1295 struct biltin *bi; 1296 1297 for (bi = biltins; bi->bi_service; bi++) 1298 if (bi->bi_socktype == sep->se_socktype && 1299 strcmp(bi->bi_service, sep->se_service) == 0) 1300 break; 1301 if (bi->bi_service == 0) { 1302 syslog(LOG_ERR, "internal service %s unknown", 1303 sep->se_service); 1304 goto more; 1305 } 1306 sep->se_bi = bi; 1307 sep->se_wait = bi->bi_wait; 1308 } else 1309 sep->se_bi = NULL; 1310 argc = 0; 1311 for (arg = skip(&cp); cp; arg = skip(&cp)) { 1312 #if MULOG 1313 char *colon; 1314 1315 if (argc == 0 && (colon = strrchr(arg, ':'))) { 1316 while (arg < colon) { 1317 int x; 1318 char *ccp; 1319 1320 switch (*arg++) { 1321 case 'l': 1322 x = 1; 1323 if (isdigit(*arg)) { 1324 x = strtol(arg, &ccp, 0); 1325 if (ccp == arg) 1326 break; 1327 arg = ccp; 1328 } 1329 sep->se_log &= ~MULOG_RFC931; 1330 sep->se_log |= x; 1331 break; 1332 case 'a': 1333 sep->se_log |= MULOG_RFC931; 1334 break; 1335 default: 1336 break; 1337 } 1338 } 1339 arg = colon + 1; 1340 } 1341 #endif 1342 if (argc < MAXARGV) 1343 sep->se_argv[argc++] = newstr(arg); 1344 } 1345 while (argc <= MAXARGV) 1346 sep->se_argv[argc++] = NULL; 1347 return (sep); 1348 } 1349 1350 void 1351 freeconfig(cp) 1352 struct servtab *cp; 1353 { 1354 int i; 1355 1356 if (cp->se_hostaddr) 1357 free(cp->se_hostaddr); 1358 if (cp->se_service) 1359 free(cp->se_service); 1360 if (cp->se_proto) 1361 free(cp->se_proto); 1362 if (cp->se_user) 1363 free(cp->se_user); 1364 /* Note: se_group is part of the newstr'ed se_user */ 1365 if (cp->se_server) 1366 free(cp->se_server); 1367 for (i = 0; i < MAXARGV; i++) 1368 if (cp->se_argv[i]) 1369 free(cp->se_argv[i]); 1370 } 1371 1372 1373 /* 1374 * Safe skip - if skip returns null, log a syntax error in the 1375 * configuration file and exit. 1376 */ 1377 char * 1378 sskip(cpp) 1379 char **cpp; 1380 { 1381 char *cp; 1382 1383 cp = skip(cpp); 1384 if (cp == NULL) { 1385 syslog(LOG_ERR, "%s: syntax error", CONFIG); 1386 exit(-1); 1387 } 1388 return (cp); 1389 } 1390 1391 char * 1392 skip(cpp) 1393 char **cpp; 1394 { 1395 char *cp = *cpp; 1396 char *start; 1397 1398 if (*cpp == NULL) 1399 return ((char *)0); 1400 1401 again: 1402 while (*cp == ' ' || *cp == '\t') 1403 cp++; 1404 if (*cp == '\0') { 1405 int c; 1406 1407 c = getc(fconfig); 1408 (void) ungetc(c, fconfig); 1409 if (c == ' ' || c == '\t') 1410 if ((cp = nextline(fconfig))) 1411 goto again; 1412 *cpp = (char *)0; 1413 return ((char *)0); 1414 } 1415 start = cp; 1416 while (*cp && *cp != ' ' && *cp != '\t') 1417 cp++; 1418 if (*cp != '\0') 1419 *cp++ = '\0'; 1420 *cpp = cp; 1421 return (start); 1422 } 1423 1424 char * 1425 nextline(fd) 1426 FILE *fd; 1427 { 1428 char *cp; 1429 1430 if (fgets(line, sizeof (line), fd) == NULL) 1431 return ((char *)0); 1432 cp = strchr(line, '\n'); 1433 if (cp) 1434 *cp = '\0'; 1435 return (line); 1436 } 1437 1438 char * 1439 newstr(cp) 1440 char *cp; 1441 { 1442 if ((cp = strdup(cp ? cp : ""))) 1443 return (cp); 1444 syslog(LOG_ERR, "strdup: %m"); 1445 exit(-1); 1446 } 1447 1448 void 1449 inetd_setproctitle(a, s) 1450 char *a; 1451 int s; 1452 { 1453 int size; 1454 char *cp; 1455 struct sockaddr_in sin; 1456 char buf[80]; 1457 1458 cp = Argv[0]; 1459 size = sizeof(sin); 1460 if (getpeername(s, (struct sockaddr *)&sin, &size) == 0) 1461 (void)snprintf(buf, sizeof buf, "-%s [%s]", a, 1462 inet_ntoa(sin.sin_addr)); 1463 else 1464 (void)snprintf(buf, sizeof buf, "-%s", a); 1465 strncpy(cp, buf, LastArg - cp); 1466 cp += strlen(cp); 1467 while (cp < LastArg) 1468 *cp++ = ' '; 1469 } 1470 1471 void 1472 logpid() 1473 { 1474 FILE *fp; 1475 1476 if ((fp = fopen(_PATH_INETDPID, "w")) != NULL) { 1477 fprintf(fp, "%u\n", getpid()); 1478 (void)fclose(fp); 1479 } 1480 } 1481 1482 void 1483 bump_nofile() 1484 { 1485 #ifdef RLIMIT_NOFILE 1486 1487 #define FD_CHUNK 32 1488 1489 struct rlimit rl; 1490 1491 if (getrlimit(RLIMIT_NOFILE, &rl) < 0) { 1492 syslog(LOG_ERR, "getrlimit: %m"); 1493 return; 1494 } 1495 rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK); 1496 if (rl.rlim_cur <= rlim_ofile_cur) { 1497 syslog(LOG_ERR, 1498 "bump_nofile: cannot extend file limit, max = %d", 1499 (int)rl.rlim_cur); 1500 return; 1501 } 1502 1503 if (setrlimit(RLIMIT_NOFILE, &rl) < 0) { 1504 syslog(LOG_ERR, "setrlimit: %m"); 1505 return; 1506 } 1507 1508 rlim_ofile_cur = rl.rlim_cur; 1509 return; 1510 1511 #else 1512 syslog(LOG_ERR, "bump_nofile: cannot extend file limit"); 1513 return; 1514 #endif 1515 } 1516 1517 /* 1518 * Internet services provided internally by inetd: 1519 */ 1520 #define BUFSIZE 4096 1521 1522 /* ARGSUSED */ 1523 void 1524 echo_stream(s, sep) /* Echo service -- echo data back */ 1525 int s; 1526 struct servtab *sep; 1527 { 1528 char buffer[BUFSIZE]; 1529 int i; 1530 1531 inetd_setproctitle(sep->se_service, s); 1532 while ((i = read(s, buffer, sizeof(buffer))) > 0 && 1533 write(s, buffer, i) > 0) 1534 ; 1535 } 1536 1537 /* ARGSUSED */ 1538 void 1539 echo_dg(s, sep) /* Echo service -- echo data back */ 1540 int s; 1541 struct servtab *sep; 1542 { 1543 char buffer[BUFSIZE]; 1544 int i, size; 1545 struct sockaddr sa; 1546 1547 size = sizeof(sa); 1548 if ((i = recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size)) < 0) 1549 return; 1550 (void) sendto(s, buffer, i, 0, &sa, sizeof(sa)); 1551 } 1552 1553 /* ARGSUSED */ 1554 void 1555 discard_stream(s, sep) /* Discard service -- ignore data */ 1556 int s; 1557 struct servtab *sep; 1558 { 1559 char buffer[BUFSIZE]; 1560 1561 inetd_setproctitle(sep->se_service, s); 1562 while ((errno = 0, read(s, buffer, sizeof(buffer)) > 0) || 1563 errno == EINTR) 1564 ; 1565 } 1566 1567 /* ARGSUSED */ 1568 void 1569 discard_dg(s, sep) /* Discard service -- ignore data */ 1570 int s; 1571 struct servtab *sep; 1572 { 1573 char buffer[BUFSIZE]; 1574 1575 (void) read(s, buffer, sizeof(buffer)); 1576 } 1577 1578 #include <ctype.h> 1579 #define LINESIZ 72 1580 char ring[128]; 1581 char *endring; 1582 1583 void 1584 initring() 1585 { 1586 int i; 1587 1588 endring = ring; 1589 1590 for (i = 0; i <= 128; ++i) 1591 if (isprint(i)) 1592 *endring++ = i; 1593 } 1594 1595 /* ARGSUSED */ 1596 void 1597 chargen_stream(s, sep) /* Character generator */ 1598 int s; 1599 struct servtab *sep; 1600 { 1601 int len; 1602 char *rs, text[LINESIZ+2]; 1603 1604 inetd_setproctitle(sep->se_service, s); 1605 1606 if (!endring) { 1607 initring(); 1608 rs = ring; 1609 } 1610 1611 text[LINESIZ] = '\r'; 1612 text[LINESIZ + 1] = '\n'; 1613 for (rs = ring;;) { 1614 if ((len = endring - rs) >= LINESIZ) 1615 memmove(text, rs, LINESIZ); 1616 else { 1617 memmove(text, rs, len); 1618 memmove(text + len, ring, LINESIZ - len); 1619 } 1620 if (++rs == endring) 1621 rs = ring; 1622 if (write(s, text, sizeof(text)) != sizeof(text)) 1623 break; 1624 } 1625 } 1626 1627 /* ARGSUSED */ 1628 void 1629 chargen_dg(s, sep) /* Character generator */ 1630 int s; 1631 struct servtab *sep; 1632 { 1633 struct sockaddr sa; 1634 static char *rs; 1635 int len, size; 1636 char text[LINESIZ+2]; 1637 1638 if (endring == 0) { 1639 initring(); 1640 rs = ring; 1641 } 1642 1643 size = sizeof(sa); 1644 if (recvfrom(s, text, sizeof(text), 0, &sa, &size) < 0) 1645 return; 1646 1647 if ((len = endring - rs) >= LINESIZ) 1648 memmove(text, rs, LINESIZ); 1649 else { 1650 memmove(text, rs, len); 1651 memmove(text + len, ring, LINESIZ - len); 1652 } 1653 if (++rs == endring) 1654 rs = ring; 1655 text[LINESIZ] = '\r'; 1656 text[LINESIZ + 1] = '\n'; 1657 (void) sendto(s, text, sizeof(text), 0, &sa, sizeof(sa)); 1658 } 1659 1660 /* 1661 * Return a machine readable date and time, in the form of the 1662 * number of seconds since midnight, Jan 1, 1900. Since gettimeofday 1663 * returns the number of seconds since midnight, Jan 1, 1970, 1664 * we must add 2208988800 seconds to this figure to make up for 1665 * some seventy years Bell Labs was asleep. 1666 */ 1667 1668 long 1669 machtime() 1670 { 1671 struct timeval tv; 1672 1673 if (gettimeofday(&tv, (struct timezone *)0) < 0) { 1674 if (debug) 1675 fprintf(stderr, "Unable to get time of day\n"); 1676 return (0L); 1677 } 1678 #define OFFSET ((u_long)25567 * 24*60*60) 1679 return (htonl((long)(tv.tv_sec + OFFSET))); 1680 #undef OFFSET 1681 } 1682 1683 /* ARGSUSED */ 1684 void 1685 machtime_stream(s, sep) 1686 int s; 1687 struct servtab *sep; 1688 { 1689 long result; 1690 1691 result = machtime(); 1692 (void) write(s, (char *) &result, sizeof(result)); 1693 } 1694 1695 /* ARGSUSED */ 1696 void 1697 machtime_dg(s, sep) 1698 int s; 1699 struct servtab *sep; 1700 { 1701 long result; 1702 struct sockaddr sa; 1703 int size; 1704 1705 size = sizeof(sa); 1706 if (recvfrom(s, (char *)&result, sizeof(result), 0, &sa, &size) < 0) 1707 return; 1708 result = machtime(); 1709 (void) sendto(s, (char *) &result, sizeof(result), 0, &sa, sizeof(sa)); 1710 } 1711 1712 /* ARGSUSED */ 1713 void 1714 daytime_stream(s, sep) /* Return human-readable time of day */ 1715 int s; 1716 struct servtab *sep; 1717 { 1718 char buffer[256]; 1719 time_t clock; 1720 int len; 1721 1722 clock = time((time_t *) 0); 1723 1724 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 1725 (void) write(s, buffer, len); 1726 } 1727 1728 /* ARGSUSED */ 1729 void 1730 daytime_dg(s, sep) /* Return human-readable time of day */ 1731 int s; 1732 struct servtab *sep; 1733 { 1734 char buffer[256]; 1735 time_t clock; 1736 struct sockaddr sa; 1737 int size, len; 1738 1739 clock = time((time_t *) 0); 1740 1741 size = sizeof(sa); 1742 if (recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size) < 0) 1743 return; 1744 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 1745 (void) sendto(s, buffer, len, 0, &sa, sizeof(sa)); 1746 } 1747 1748 /* 1749 * print_service: 1750 * Dump relevant information to stderr 1751 */ 1752 void 1753 print_service(action, sep) 1754 char *action; 1755 struct servtab *sep; 1756 { 1757 if (isrpcservice(sep)) 1758 fprintf(stderr, 1759 "%s: %s rpcprog=%d, rpcvers = %d/%d, proto=%s, wait.max=%d.%d, user.group=%s.%s builtin=%lx server=%s\n", 1760 action, sep->se_service, 1761 sep->se_rpcprog, sep->se_rpcversh, sep->se_rpcversl, sep->se_proto, 1762 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 1763 (long)sep->se_bi, sep->se_server); 1764 else 1765 fprintf(stderr, 1766 "%s: %s proto=%s, wait.max=%d.%d, user.group=%s.%s builtin=%lx server=%s\n", 1767 action, sep->se_service, sep->se_proto, 1768 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 1769 (long)sep->se_bi, sep->se_server); 1770 } 1771 1772 void 1773 usage() 1774 { 1775 1776 #ifdef LIBWRAP 1777 (void)fprintf(stderr, "usage: %s [-dl] [conf]\n", __progname); 1778 #else 1779 (void)fprintf(stderr, "usage: %s [-d] [conf]\n", __progname); 1780 #endif 1781 exit(1); 1782 } 1783 1784 1785 /* 1786 * Based on TCPMUX.C by Mark K. Lottor November 1988 1787 * sri-nic::ps:<mkl>tcpmux.c 1788 */ 1789 1790 static int /* # of characters upto \r,\n or \0 */ 1791 getline(fd, buf, len) 1792 int fd; 1793 char *buf; 1794 int len; 1795 { 1796 int count = 0, n; 1797 1798 do { 1799 n = read(fd, buf, len-count); 1800 if (n == 0) 1801 return (count); 1802 if (n < 0) 1803 return (-1); 1804 while (--n >= 0) { 1805 if (*buf == '\r' || *buf == '\n' || *buf == '\0') 1806 return (count); 1807 count++; 1808 buf++; 1809 } 1810 } while (count < len); 1811 return (count); 1812 } 1813 1814 #define MAX_SERV_LEN (256+2) /* 2 bytes for \r\n */ 1815 1816 #define strwrite(fd, buf) (void) write(fd, buf, sizeof(buf)-1) 1817 1818 void 1819 tcpmux(ctrl, sep) 1820 int ctrl; 1821 struct servtab *sep; 1822 { 1823 char service[MAX_SERV_LEN+1]; 1824 int len; 1825 1826 /* Get requested service name */ 1827 if ((len = getline(ctrl, service, MAX_SERV_LEN)) < 0) { 1828 strwrite(ctrl, "-Error reading service name\r\n"); 1829 goto reject; 1830 } 1831 service[len] = '\0'; 1832 1833 if (debug) 1834 fprintf(stderr, "tcpmux: someone wants %s\n", service); 1835 1836 /* 1837 * Help is a required command, and lists available services, 1838 * one per line. 1839 */ 1840 if (!strcasecmp(service, "help")) { 1841 strwrite(ctrl, "+Available services:\r\n"); 1842 strwrite(ctrl, "help\r\n"); 1843 for (sep = servtab; sep; sep = sep->se_next) { 1844 if (!ISMUX(sep)) 1845 continue; 1846 (void)write(ctrl, sep->se_service, 1847 strlen(sep->se_service)); 1848 strwrite(ctrl, "\r\n"); 1849 } 1850 goto reject; 1851 } 1852 1853 /* Try matching a service in inetd.conf with the request */ 1854 for (sep = servtab; sep; sep = sep->se_next) { 1855 if (!ISMUX(sep)) 1856 continue; 1857 if (!strcasecmp(service, sep->se_service)) { 1858 if (ISMUXPLUS(sep)) 1859 strwrite(ctrl, "+Go\r\n"); 1860 run_service(ctrl, sep); 1861 return; 1862 } 1863 } 1864 strwrite(ctrl, "-Service not available\r\n"); 1865 reject: 1866 _exit(1); 1867 } 1868 1869 1870 #ifdef MULOG 1871 dolog(sep, ctrl) 1872 struct servtab *sep; 1873 int ctrl; 1874 { 1875 struct sockaddr sa; 1876 struct sockaddr_in *sin = (struct sockaddr_in *)&sa; 1877 int len = sizeof(sa); 1878 struct hostent *hp; 1879 char *host, *dp, buf[BUFSIZ], *rfc931_name(); 1880 int connected = 1; 1881 1882 if (sep->se_family != AF_INET) 1883 return; 1884 1885 if (getpeername(ctrl, &sa, &len) < 0) { 1886 if (errno != ENOTCONN) { 1887 syslog(LOG_ERR, "getpeername: %m"); 1888 return; 1889 } 1890 if (recvfrom(ctrl, buf, sizeof(buf), MSG_PEEK, &sa, &len) < 0) { 1891 syslog(LOG_ERR, "recvfrom: %m"); 1892 return; 1893 } 1894 connected = 0; 1895 } 1896 if (sa.sa_family != AF_INET) { 1897 syslog(LOG_ERR, "unexpected address family %u", sa.sa_family); 1898 return; 1899 } 1900 1901 hp = gethostbyaddr((char *) &sin->sin_addr.s_addr, 1902 sizeof (sin->sin_addr.s_addr), AF_INET); 1903 1904 host = hp?hp->h_name:inet_ntoa(sin->sin_addr); 1905 1906 switch (sep->se_log & ~MULOG_RFC931) { 1907 case 0: 1908 return; 1909 case 1: 1910 if (curdom == NULL || *curdom == '\0') 1911 break; 1912 dp = host + strlen(host) - strlen(curdom); 1913 if (dp < host) 1914 break; 1915 if (debug) 1916 fprintf(stderr, "check \"%s\" against curdom \"%s\"\n", 1917 host, curdom); 1918 if (strcasecmp(dp, curdom) == 0) 1919 return; 1920 break; 1921 case 2: 1922 default: 1923 break; 1924 } 1925 1926 openlog("", LOG_NOWAIT, MULOG); 1927 1928 if (connected && (sep->se_log & MULOG_RFC931)) 1929 syslog(LOG_INFO, "%s@%s wants %s", 1930 rfc931_name(sin, ctrl), host, sep->se_service); 1931 else 1932 syslog(LOG_INFO, "%s wants %s", 1933 host, sep->se_service); 1934 } 1935 1936 /* 1937 * From tcp_log by 1938 * Wietse Venema, Eindhoven University of Technology, The Netherlands. 1939 */ 1940 #if 0 1941 static char sccsid[] = "@(#) rfc931.c 1.3 92/08/31 22:54:46"; 1942 #endif 1943 1944 #include <setjmp.h> 1945 1946 #define RFC931_PORT 113 /* Semi-well-known port */ 1947 #define TIMEOUT 4 1948 #define TIMEOUT2 10 1949 1950 static jmp_buf timebuf; 1951 1952 /* timeout - handle timeouts */ 1953 1954 static void timeout(sig) 1955 int sig; 1956 { 1957 longjmp(timebuf, sig); 1958 } 1959 1960 /* rfc931_name - return remote user name */ 1961 1962 char * 1963 rfc931_name(there, ctrl) 1964 struct sockaddr_in *there; /* remote link information */ 1965 int ctrl; 1966 { 1967 struct sockaddr_in here; /* local link information */ 1968 struct sockaddr_in sin; /* for talking to RFC931 daemon */ 1969 int length; 1970 int s; 1971 unsigned remote; 1972 unsigned local; 1973 static char user[256]; /* XXX */ 1974 char buf[256]; 1975 char *cp; 1976 char *result = "USER_UNKNOWN"; 1977 int len; 1978 1979 /* Find out local port number of our stdin. */ 1980 1981 length = sizeof(here); 1982 if (getsockname(ctrl, (struct sockaddr *) &here, &length) == -1) { 1983 syslog(LOG_ERR, "getsockname: %m"); 1984 return (result); 1985 } 1986 /* Set up timer so we won't get stuck. */ 1987 1988 if ((s = socket(AF_INET, SOCK_STREAM, 0)) == -1) { 1989 syslog(LOG_ERR, "socket: %m"); 1990 return (result); 1991 } 1992 1993 sin = here; 1994 sin.sin_port = htons(0); 1995 if (bind(s, (struct sockaddr *) &sin, sizeof(sin)) == -1) { 1996 syslog(LOG_ERR, "bind: %m"); 1997 return (result); 1998 } 1999 2000 signal(SIGALRM, timeout); 2001 if (setjmp(timebuf)) { 2002 close(s); /* not: fclose(fp) */ 2003 return (result); 2004 } 2005 alarm(TIMEOUT); 2006 2007 /* Connect to the RFC931 daemon. */ 2008 2009 sin = *there; 2010 sin.sin_port = htons(RFC931_PORT); 2011 if (connect(s, (struct sockaddr *) &sin, sizeof(sin)) == -1) { 2012 close(s); 2013 alarm(0); 2014 return (result); 2015 } 2016 2017 /* Query the RFC 931 server. Would 13-byte writes ever be broken up? */ 2018 (void)snprintf(buf, sizeof buf, "%u,%u\r\n", ntohs(there->sin_port), 2019 ntohs(here.sin_port)); 2020 2021 2022 for (len = 0, cp = buf; len < strlen(buf); ) { 2023 int n; 2024 2025 if ((n = write(s, cp, strlen(buf) - len)) == -1) { 2026 close(s); 2027 alarm(0); 2028 return (result); 2029 } 2030 cp += n; 2031 len += n; 2032 } 2033 2034 /* Read response */ 2035 for (cp = buf; cp < buf + sizeof(buf) - 1; ) { 2036 char c; 2037 if (read(s, &c, 1) != 1) { 2038 close(s); 2039 alarm(0); 2040 return (result); 2041 } 2042 if (c == '\n') 2043 break; 2044 *cp++ = c; 2045 } 2046 *cp = '\0'; 2047 2048 if (sscanf(buf, "%u , %u : USERID :%*[^:]:%255s", &remote, &local, user) == 3 2049 && ntohs(there->sin_port) == remote 2050 && ntohs(here.sin_port) == local) { 2051 2052 /* Strip trailing carriage return. */ 2053 if (cp = strchr(user, '\r')) 2054 *cp = 0; 2055 result = user; 2056 } 2057 2058 alarm(0); 2059 close(s); 2060 return (result); 2061 } 2062 #endif 2063
Indexes created Fri Sep 26 20:09:58 GMT 2025