inetd.c revision 1.45
1 /* $NetBSD: inetd.c,v 1.45 1999/01/20 04:42:17 mycroft Exp $ */ 2 3 /*- 4 * Copyright (c) 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 9 * NASA Ames Research Center. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 /* 41 * Copyright (c) 1983, 1991, 1993, 1994 42 * The Regents of the University of California. All rights reserved. 43 * 44 * Redistribution and use in source and binary forms, with or without 45 * modification, are permitted provided that the following conditions 46 * are met: 47 * 1. Redistributions of source code must retain the above copyright 48 * notice, this list of conditions and the following disclaimer. 49 * 2. Redistributions in binary form must reproduce the above copyright 50 * notice, this list of conditions and the following disclaimer in the 51 * documentation and/or other materials provided with the distribution. 52 * 3. All advertising materials mentioning features or use of this software 53 * must display the following acknowledgement: 54 * This product includes software developed by the University of 55 * California, Berkeley and its contributors. 56 * 4. Neither the name of the University nor the names of its contributors 57 * may be used to endorse or promote products derived from this software 58 * without specific prior written permission. 59 * 60 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 61 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 62 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 63 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 64 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 65 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 66 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 67 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 68 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 69 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 70 * SUCH DAMAGE. 71 */ 72 73 #include <sys/cdefs.h> 74 #ifndef lint 75 __COPYRIGHT("@(#) Copyright (c) 1983, 1991, 1993, 1994\n\ 76 The Regents of the University of California. All rights reserved.\n"); 77 #if 0 78 static char sccsid[] = "@(#)inetd.c 8.4 (Berkeley) 4/13/94"; 79 #else 80 __RCSID("$NetBSD: inetd.c,v 1.45 1999/01/20 04:42:17 mycroft Exp $"); 81 #endif 82 #endif /* not lint */ 83 84 /* 85 * Inetd - Internet super-server 86 * 87 * This program invokes all internet services as needed. Connection-oriented 88 * services are invoked each time a connection is made, by creating a process. 89 * This process is passed the connection as file descriptor 0 and is expected 90 * to do a getpeername to find out the source host and port. 91 * 92 * Datagram oriented services are invoked when a datagram 93 * arrives; a process is created and passed a pending message 94 * on file descriptor 0. Datagram servers may either connect 95 * to their peer, freeing up the original socket for inetd 96 * to receive further messages on, or ``take over the socket'', 97 * processing all arriving datagrams and, eventually, timing 98 * out. The first type of server is said to be ``multi-threaded''; 99 * the second type of server ``single-threaded''. 100 * 101 * Inetd uses a configuration file which is read at startup 102 * and, possibly, at some later time in response to a hangup signal. 103 * The configuration file is ``free format'' with fields given in the 104 * order shown below. Continuation lines for an entry must being with 105 * a space or tab. All fields must be present in each entry. 106 * 107 * service name must be in /etc/services or must 108 * name a tcpmux service 109 * socket type stream/dgram/raw/rdm/seqpacket 110 * protocol must be in /etc/protocols 111 * wait/nowait[.max] single-threaded/multi-threaded, max # 112 * user[.group] user/group to run daemon as 113 * server program full path name 114 * server program arguments maximum of MAXARGS (20) 115 * 116 * For RPC services 117 * service name/version must be in /etc/rpc 118 * socket type stream/dgram/raw/rdm/seqpacket 119 * protocol must be in /etc/protocols 120 * wait/nowait[.max] single-threaded/multi-threaded 121 * user[.group] user to run daemon as 122 * server program full path name 123 * server program arguments maximum of MAXARGS (20) 124 * 125 * For non-RPC services, the "service name" can be of the form 126 * hostaddress:servicename, in which case the hostaddress is used 127 * as the host portion of the address to listen on. If hostaddress 128 * consists of a single `*' character, INADDR_ANY is used. 129 * 130 * A line can also consist of just 131 * hostaddress: 132 * where hostaddress is as in the preceding paragraph. Such a line must 133 * have no further fields; the specified hostaddress is remembered and 134 * used for all further lines that have no hostaddress specified, 135 * until the next such line (or EOF). (This is why * is provided to 136 * allow explicit specification of INADDR_ANY.) A line 137 * *: 138 * is implicitly in effect at the beginning of the file. 139 * 140 * The hostaddress specifier may (and often will) contain dots; 141 * the service name must not. 142 * 143 * For RPC services, host-address specifiers are accepted and will 144 * work to some extent; however, because of limitations in the 145 * portmapper interface, it will not work to try to give more than 146 * one line for any given RPC service, even if the host-address 147 * specifiers are different. 148 * 149 * TCP services without official port numbers are handled with the 150 * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for 151 * requests. When a connection is made from a foreign host, the service 152 * requested is passed to tcpmux, which looks it up in the servtab list 153 * and returns the proper entry for the service. Tcpmux returns a 154 * negative reply if the service doesn't exist, otherwise the invoked 155 * server is expected to return the positive reply if the service type in 156 * inetd.conf file has the prefix "tcpmux/". If the service type has the 157 * prefix "tcpmux/+", tcpmux will return the positive reply for the 158 * process; this is for compatibility with older server code, and also 159 * allows you to invoke programs that use stdin/stdout without putting any 160 * special server code in them. Services that use tcpmux are "nowait" 161 * because they do not have a well-known port and hence cannot listen 162 * for new requests. 163 * 164 * Comment lines are indicated by a `#' in column 1. 165 */ 166 167 /* 168 * Here's the scoop concerning the user.group feature: 169 * 170 * 1) set-group-option off. 171 * 172 * a) user = root: NO setuid() or setgid() is done 173 * 174 * b) other: setuid() 175 * setgid(primary group as found in passwd) 176 * initgroups(name, primary group) 177 * 178 * 2) set-group-option on. 179 * 180 * a) user = root: NO setuid() 181 * setgid(specified group) 182 * NO initgroups() 183 * 184 * b) other: setuid() 185 * setgid(specified group) 186 * initgroups(name, specified group) 187 * 188 */ 189 190 #include <sys/param.h> 191 #include <sys/stat.h> 192 #include <sys/ioctl.h> 193 #include <sys/socket.h> 194 #include <sys/un.h> 195 #include <sys/wait.h> 196 #include <sys/time.h> 197 #include <sys/resource.h> 198 199 #ifndef RLIMIT_NOFILE 200 #define RLIMIT_NOFILE RLIMIT_OFILE 201 #endif 202 203 #define RPC 204 205 #include <netinet/in.h> 206 #include <arpa/inet.h> 207 #ifdef RPC 208 #include <rpc/rpc.h> 209 #include <rpc/pmap_clnt.h> 210 #endif 211 212 #include <ctype.h> 213 #include <errno.h> 214 #include <fcntl.h> 215 #include <grp.h> 216 #include <netdb.h> 217 #include <pwd.h> 218 #include <signal.h> 219 #include <stdio.h> 220 #include <stdlib.h> 221 #include <string.h> 222 #include <syslog.h> 223 #include <unistd.h> 224 225 #include "pathnames.h" 226 227 #ifdef LIBWRAP 228 # include <tcpd.h> 229 #ifndef LIBWRAP_ALLOW_FACILITY 230 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH 231 #endif 232 #ifndef LIBWRAP_ALLOW_SEVERITY 233 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO 234 #endif 235 #ifndef LIBWRAP_DENY_FACILITY 236 # define LIBWRAP_DENY_FACILITY LOG_AUTH 237 #endif 238 #ifndef LIBWRAP_DENY_SEVERITY 239 # define LIBWRAP_DENY_SEVERITY LOG_WARNING 240 #endif 241 int allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY; 242 int deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY; 243 #endif 244 245 #define TOOMANY 40 /* don't start more than TOOMANY */ 246 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */ 247 #define RETRYTIME (60*10) /* retry after bind or server fail */ 248 249 #define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM)) 250 251 int debug; 252 #ifdef LIBWRAP 253 int lflag; 254 #endif 255 int nsock, maxsock; 256 fd_set allsock; 257 int options; 258 int timingout; 259 struct servent *sp; 260 char *curdom; 261 262 #ifndef OPEN_MAX 263 #define OPEN_MAX 64 264 #endif 265 266 /* Reserve some descriptors, 3 stdio + at least: 1 log, 1 conf. file */ 267 #define FD_MARGIN (8) 268 typeof(((struct rlimit *)0)->rlim_cur) rlim_ofile_cur = OPEN_MAX; 269 270 #ifdef RLIMIT_NOFILE 271 struct rlimit rlim_ofile; 272 #endif 273 274 struct servtab { 275 char *se_hostaddr; /* host address to listen on */ 276 char *se_service; /* name of service */ 277 int se_socktype; /* type of socket to use */ 278 int se_family; /* address family */ 279 char *se_proto; /* protocol used */ 280 int se_sndbuf; /* sndbuf size */ 281 int se_rcvbuf; /* rcvbuf size */ 282 int se_rpcprog; /* rpc program number */ 283 int se_rpcversl; /* rpc program lowest version */ 284 int se_rpcversh; /* rpc program highest version */ 285 #define isrpcservice(sep) ((sep)->se_rpcversl != 0) 286 short se_wait; /* single threaded server */ 287 short se_checked; /* looked at during merge */ 288 char *se_user; /* user name to run as */ 289 char *se_group; /* group name to run as */ 290 struct biltin *se_bi; /* if built-in, description */ 291 char *se_server; /* server program */ 292 #define MAXARGV 20 293 char *se_argv[MAXARGV+1]; /* program arguments */ 294 int se_fd; /* open descriptor */ 295 int se_type; /* type */ 296 union { 297 struct sockaddr se_un_ctrladdr; 298 struct sockaddr_in se_un_ctrladdr_in; 299 struct sockaddr_un se_un_ctrladdr_un; 300 } se_un; /* bound address */ 301 #define se_ctrladdr se_un.se_un_ctrladdr 302 #define se_ctrladdr_in se_un.se_un_ctrladdr_in 303 #define se_ctrladdr_un se_un.se_un_ctrladdr_un 304 int se_ctrladdr_size; 305 int se_max; /* max # of instances of this service */ 306 int se_count; /* number started since se_time */ 307 struct timeval se_time; /* start of se_count */ 308 #ifdef MULOG 309 int se_log; 310 #define MULOG_RFC931 0x40000000 311 #endif 312 struct servtab *se_next; 313 } *servtab; 314 315 #define NORM_TYPE 0 316 #define MUX_TYPE 1 317 #define MUXPLUS_TYPE 2 318 #define ISMUX(sep) (((sep)->se_type == MUX_TYPE) || \ 319 ((sep)->se_type == MUXPLUS_TYPE)) 320 #define ISMUXPLUS(sep) ((sep)->se_type == MUXPLUS_TYPE) 321 322 323 void chargen_dg __P((int, struct servtab *)); 324 void chargen_stream __P((int, struct servtab *)); 325 void close_sep __P((struct servtab *)); 326 void config __P((int)); 327 void daytime_dg __P((int, struct servtab *)); 328 void daytime_stream __P((int, struct servtab *)); 329 void discard_dg __P((int, struct servtab *)); 330 void discard_stream __P((int, struct servtab *)); 331 void echo_dg __P((int, struct servtab *)); 332 void echo_stream __P((int, struct servtab *)); 333 void endconfig __P((void)); 334 struct servtab *enter __P((struct servtab *)); 335 void freeconfig __P((struct servtab *)); 336 struct servtab *getconfigent __P((void)); 337 void goaway __P((int)); 338 void machtime_dg __P((int, struct servtab *)); 339 void machtime_stream __P((int, struct servtab *)); 340 char *newstr __P((char *)); 341 char *nextline __P((FILE *)); 342 void print_service __P((char *, struct servtab *)); 343 void reapchild __P((int)); 344 void retry __P((int)); 345 void run_service __P((int, struct servtab *)); 346 int setconfig __P((void)); 347 void setup __P((struct servtab *)); 348 char *sskip __P((char **)); 349 char *skip __P((char **)); 350 void tcpmux __P((int, struct servtab *)); 351 void usage __P((void)); 352 void logpid __P((void)); 353 void register_rpc __P((struct servtab *sep)); 354 void unregister_rpc __P((struct servtab *sep)); 355 void bump_nofile __P((void)); 356 void inetd_setproctitle __P((char *, int)); 357 void initring __P((void)); 358 long machtime __P((void)); 359 static int getline __P((int, char *, int)); 360 int main __P((int, char *[], char *[])); 361 362 struct biltin { 363 char *bi_service; /* internally provided service name */ 364 int bi_socktype; /* type of socket supported */ 365 short bi_fork; /* 1 if should fork before call */ 366 short bi_wait; /* 1 if should wait for child */ 367 void (*bi_fn) __P((int, struct servtab *)); 368 /* function which performs it */ 369 } biltins[] = { 370 /* Echo received data */ 371 { "echo", SOCK_STREAM, 1, 0, echo_stream }, 372 { "echo", SOCK_DGRAM, 0, 0, echo_dg }, 373 374 /* Internet /dev/null */ 375 { "discard", SOCK_STREAM, 1, 0, discard_stream }, 376 { "discard", SOCK_DGRAM, 0, 0, discard_dg }, 377 378 /* Return 32 bit time since 1970 */ 379 { "time", SOCK_STREAM, 0, 0, machtime_stream }, 380 { "time", SOCK_DGRAM, 0, 0, machtime_dg }, 381 382 /* Return human-readable time */ 383 { "daytime", SOCK_STREAM, 0, 0, daytime_stream }, 384 { "daytime", SOCK_DGRAM, 0, 0, daytime_dg }, 385 386 /* Familiar character generator */ 387 { "chargen", SOCK_STREAM, 1, 0, chargen_stream }, 388 { "chargen", SOCK_DGRAM, 0, 0, chargen_dg }, 389 390 { "tcpmux", SOCK_STREAM, 1, 0, tcpmux }, 391 392 { NULL } 393 }; 394 395 #define NUMINT (sizeof(intab) / sizeof(struct inent)) 396 char *CONFIG = _PATH_INETDCONF; 397 char **Argv; 398 char *LastArg; 399 extern char *__progname; 400 401 #ifdef sun 402 /* 403 * Sun's RPC library caches the result of `dtablesize()' 404 * This is incompatible with our "bumping" of file descriptors "on demand" 405 */ 406 int 407 _rpc_dtablesize() 408 { 409 return rlim_ofile_cur; 410 } 411 #endif 412 413 int 414 main(argc, argv, envp) 415 int argc; 416 char *argv[], *envp[]; 417 { 418 struct servtab *sep, *nsep; 419 struct sigvec sv; 420 int ch, dofork; 421 pid_t pid; 422 423 Argv = argv; 424 if (envp == 0 || *envp == 0) 425 envp = argv; 426 while (*envp) 427 envp++; 428 LastArg = envp[-1] + strlen(envp[-1]); 429 430 while ((ch = getopt(argc, argv, 431 #ifdef LIBWRAP 432 "dl" 433 #else 434 "d" 435 #endif 436 )) != -1) 437 switch(ch) { 438 case 'd': 439 debug = 1; 440 options |= SO_DEBUG; 441 break; 442 #ifdef LIBWRAP 443 case 'l': 444 lflag = 1; 445 break; 446 #endif 447 case '?': 448 default: 449 usage(); 450 } 451 argc -= optind; 452 argv += optind; 453 454 if (argc > 0) 455 CONFIG = argv[0]; 456 457 if (debug == 0) 458 daemon(0, 0); 459 openlog(__progname, LOG_PID | LOG_NOWAIT, LOG_DAEMON); 460 logpid(); 461 462 #ifdef RLIMIT_NOFILE 463 if (getrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) { 464 syslog(LOG_ERR, "getrlimit: %m"); 465 } else { 466 rlim_ofile_cur = rlim_ofile.rlim_cur; 467 if (rlim_ofile_cur == RLIM_INFINITY) /* ! */ 468 rlim_ofile_cur = OPEN_MAX; 469 } 470 #endif 471 472 memset(&sv, 0, sizeof(sv)); 473 sv.sv_mask = SIGBLOCK; 474 sv.sv_handler = retry; 475 sigvec(SIGALRM, &sv, (struct sigvec *)0); 476 config(SIGHUP); 477 sv.sv_handler = config; 478 sigvec(SIGHUP, &sv, (struct sigvec *)0); 479 sv.sv_handler = reapchild; 480 sigvec(SIGCHLD, &sv, (struct sigvec *)0); 481 sv.sv_handler = goaway; 482 sigvec(SIGTERM, &sv, (struct sigvec *)0); 483 sv.sv_handler = goaway; 484 sigvec(SIGINT, &sv, (struct sigvec *)0); 485 sv.sv_mask = 0L; 486 sv.sv_handler = SIG_IGN; 487 sigvec(SIGPIPE, &sv, (struct sigvec *)0); 488 489 { 490 /* space for daemons to overwrite environment for ps */ 491 #define DUMMYSIZE 100 492 char dummy[DUMMYSIZE]; 493 494 (void)memset(dummy, 'x', DUMMYSIZE - 1); 495 dummy[DUMMYSIZE - 1] = '\0'; 496 497 (void)setenv("inetd_dummy", dummy, 1); 498 } 499 500 for (;;) { 501 int n, ctrl; 502 fd_set readable; 503 504 if (nsock == 0) { 505 (void) sigblock(SIGBLOCK); 506 while (nsock == 0) 507 sigpause(0L); 508 (void) sigsetmask(0L); 509 } 510 readable = allsock; 511 if ((n = select(maxsock + 1, &readable, (fd_set *)0, 512 (fd_set *)0, (struct timeval *)0)) <= 0) { 513 if (n == -1 && errno != EINTR) { 514 syslog(LOG_WARNING, "select: %m"); 515 sleep(1); 516 } 517 continue; 518 } 519 for (sep = servtab; n && sep; sep = nsep) { 520 nsep = sep->se_next; 521 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) { 522 n--; 523 if (debug) 524 fprintf(stderr, "someone wants %s\n", sep->se_service); 525 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 526 /* XXX here do the libwrap check-before-accept */ 527 ctrl = accept(sep->se_fd, (struct sockaddr *)0, 528 (int *)0); 529 if (debug) 530 fprintf(stderr, "accept, ctrl %d\n", ctrl); 531 if (ctrl < 0) { 532 if (errno != EINTR) 533 syslog(LOG_WARNING, 534 "accept (for %s): %m", 535 sep->se_service); 536 continue; 537 } 538 /* Set the socket to blocking mode. */ 539 if (fcntl(ctrl, F_SETFL, 0) < 0) 540 syslog(LOG_ERR, "fcntl (F_SETFL, 0): %m"); 541 } else 542 ctrl = sep->se_fd; 543 (void) sigblock(SIGBLOCK); 544 pid = 0; 545 #ifdef LIBWRAP_INTERNAL 546 dofork = 1; 547 #else 548 dofork = (sep->se_bi == 0 || sep->se_bi->bi_fork); 549 #endif 550 if (dofork) { 551 if (sep->se_count++ == 0) 552 (void)gettimeofday(&sep->se_time, 553 (struct timezone *)0); 554 else if (sep->se_count >= sep->se_max) { 555 struct timeval now; 556 557 (void)gettimeofday(&now, (struct timezone *)0); 558 if (now.tv_sec - sep->se_time.tv_sec > 559 CNT_INTVL) { 560 sep->se_time = now; 561 sep->se_count = 1; 562 } else { 563 syslog(LOG_ERR, 564 "%s/%s server failing (looping), service terminated\n", 565 sep->se_service, sep->se_proto); 566 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 567 close(ctrl); 568 close_sep(sep); 569 sigsetmask(0L); 570 if (!timingout) { 571 timingout = 1; 572 alarm(RETRYTIME); 573 } 574 continue; 575 } 576 } 577 pid = fork(); 578 if (pid < 0) { 579 syslog(LOG_ERR, "fork: %m"); 580 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 581 close(ctrl); 582 sigsetmask(0L); 583 sleep(1); 584 continue; 585 } 586 if (pid != 0 && sep->se_wait) { 587 sep->se_wait = pid; 588 FD_CLR(sep->se_fd, &allsock); 589 nsock--; 590 } 591 if (pid == 0) { 592 sv.sv_mask = 0L; 593 sv.sv_handler = SIG_DFL; 594 sigvec(SIGPIPE, &sv, (struct sigvec *)0); 595 if (debug) 596 setsid(); 597 } 598 } 599 sigsetmask(0L); 600 if (pid == 0) { 601 run_service(ctrl, sep); 602 if (dofork) 603 exit(0); 604 } 605 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 606 close(ctrl); 607 } 608 } 609 } 610 } 611 612 void 613 run_service(ctrl, sep) 614 int ctrl; 615 struct servtab *sep; 616 { 617 struct passwd *pwd; 618 struct group *grp = NULL; /* XXX gcc */ 619 char buf[7]; 620 #ifdef LIBWRAP 621 struct request_info req; 622 int denied; 623 char *service = NULL; /* XXX gcc */ 624 #endif 625 626 #ifdef LIBWRAP 627 #ifndef LIBWRAP_INTERNAL 628 if (sep->se_bi == 0) 629 #endif 630 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 631 request_init(&req, RQ_DAEMON, sep->se_argv[0] ? 632 sep->se_argv[0] : sep->se_service, RQ_FILE, ctrl, NULL); 633 fromhost(&req); 634 denied = !hosts_access(&req); 635 if (denied || lflag) { 636 sp = getservbyport(sep->se_ctrladdr_in.sin_port, 637 sep->se_proto); 638 if (sp == NULL) { 639 (void)snprintf(buf, sizeof buf, "%d", 640 ntohs(sep->se_ctrladdr_in.sin_port)); 641 service = buf; 642 } else 643 service = sp->s_name; 644 } 645 if (denied) { 646 syslog(deny_severity, 647 "refused connection from %.500s, service %s (%s)", 648 eval_client(&req), service, sep->se_proto); 649 goto reject; 650 } 651 if (lflag) { 652 syslog(allow_severity, 653 "connection from %.500s, service %s (%s)", 654 eval_client(&req), service, sep->se_proto); 655 } 656 } 657 #endif /* LIBWRAP */ 658 659 if (sep->se_bi) { 660 (*sep->se_bi->bi_fn)(ctrl, sep); 661 } else { 662 if ((pwd = getpwnam(sep->se_user)) == NULL) { 663 syslog(LOG_ERR, "%s/%s: %s: No such user", 664 sep->se_service, sep->se_proto, sep->se_user); 665 goto reject; 666 } 667 if (sep->se_group && 668 (grp = getgrnam(sep->se_group)) == NULL) { 669 syslog(LOG_ERR, "%s/%s: %s: No such group", 670 sep->se_service, sep->se_proto, sep->se_group); 671 goto reject; 672 } 673 if (pwd->pw_uid) { 674 if (sep->se_group) 675 pwd->pw_gid = grp->gr_gid; 676 if (setgid(pwd->pw_gid) < 0) { 677 syslog(LOG_ERR, 678 "%s/%s: can't set gid %d: %m", sep->se_service, 679 sep->se_proto, pwd->pw_gid); 680 goto reject; 681 } 682 (void) initgroups(pwd->pw_name, 683 pwd->pw_gid); 684 if (setuid(pwd->pw_uid) < 0) { 685 syslog(LOG_ERR, 686 "%s/%s: can't set uid %d: %m", sep->se_service, 687 sep->se_proto, pwd->pw_uid); 688 goto reject; 689 } 690 } else if (sep->se_group) { 691 (void) setgid((gid_t)grp->gr_gid); 692 } 693 if (debug) 694 fprintf(stderr, "%d execl %s\n", 695 getpid(), sep->se_server); 696 #ifdef MULOG 697 if (sep->se_log) 698 dolog(sep, ctrl); 699 #endif 700 /* Set our control descriptor to not close-on-exec... */ 701 if (fcntl(ctrl, F_SETFD, 0) < 0) 702 syslog(LOG_ERR, "fcntl (F_SETFD, 0): %m"); 703 /* ...and dup it to stdin, stdout, and stderr. */ 704 if (ctrl != 0) { 705 dup2(ctrl, 0); 706 close(ctrl); 707 ctrl = 0; 708 } 709 dup2(0, 1); 710 dup2(0, 2); 711 #ifdef RLIMIT_NOFILE 712 if (rlim_ofile.rlim_cur != rlim_ofile_cur && 713 setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) 714 syslog(LOG_ERR, "setrlimit: %m"); 715 #endif 716 execv(sep->se_server, sep->se_argv); 717 syslog(LOG_ERR, "cannot execute %s: %m", sep->se_server); 718 reject: 719 if (sep->se_socktype != SOCK_STREAM) 720 recv(ctrl, buf, sizeof (buf), 0); 721 _exit(1); 722 } 723 } 724 725 void 726 reapchild(signo) 727 int signo; 728 { 729 int status; 730 pid_t pid; 731 struct servtab *sep; 732 733 for (;;) { 734 pid = wait3(&status, WNOHANG, (struct rusage *)0); 735 if (pid <= 0) 736 break; 737 if (debug) 738 fprintf(stderr, "%d reaped, status %#x\n", 739 pid, status); 740 for (sep = servtab; sep; sep = sep->se_next) 741 if (sep->se_wait == pid) { 742 if (WIFEXITED(status) && WEXITSTATUS(status)) 743 syslog(LOG_WARNING, 744 "%s: exit status 0x%x", 745 sep->se_server, WEXITSTATUS(status)); 746 else if (WIFSIGNALED(status)) 747 syslog(LOG_WARNING, 748 "%s: exit signal 0x%x", 749 sep->se_server, WTERMSIG(status)); 750 sep->se_wait = 1; 751 FD_SET(sep->se_fd, &allsock); 752 nsock++; 753 if (debug) 754 fprintf(stderr, "restored %s, fd %d\n", 755 sep->se_service, sep->se_fd); 756 } 757 } 758 } 759 760 void 761 config(signo) 762 int signo; 763 { 764 struct servtab *sep, *cp, **sepp; 765 long omask; 766 int n; 767 768 if (!setconfig()) { 769 syslog(LOG_ERR, "%s: %m", CONFIG); 770 return; 771 } 772 for (sep = servtab; sep; sep = sep->se_next) 773 sep->se_checked = 0; 774 while ((cp = getconfigent())) { 775 for (sep = servtab; sep; sep = sep->se_next) 776 if (strcmp(sep->se_service, cp->se_service) == 0 && 777 strcmp(sep->se_hostaddr, cp->se_hostaddr) == 0 && 778 strcmp(sep->se_proto, cp->se_proto) == 0 && 779 ISMUX(sep) == ISMUX(cp)) 780 break; 781 if (sep != 0) { 782 int i; 783 784 #define SWAP(type, a, b) {type c=(type)a; (type)a=(type)b; (type)b=(type)c;} 785 786 omask = sigblock(SIGBLOCK); 787 /* 788 * sep->se_wait may be holding the pid of a daemon 789 * that we're waiting for. If so, don't overwrite 790 * it unless the config file explicitly says don't 791 * wait. 792 */ 793 if (cp->se_bi == 0 && 794 (sep->se_wait == 1 || cp->se_wait == 0)) 795 sep->se_wait = cp->se_wait; 796 SWAP(char *, sep->se_user, cp->se_user); 797 SWAP(char *, sep->se_group, cp->se_group); 798 SWAP(char *, sep->se_server, cp->se_server); 799 for (i = 0; i < MAXARGV; i++) 800 SWAP(char *, sep->se_argv[i], cp->se_argv[i]); 801 SWAP(int, cp->se_type, sep->se_type); 802 SWAP(int, cp->se_max, sep->se_max); 803 #undef SWAP 804 if (isrpcservice(sep)) 805 unregister_rpc(sep); 806 sep->se_rpcversl = cp->se_rpcversl; 807 sep->se_rpcversh = cp->se_rpcversh; 808 sigsetmask(omask); 809 freeconfig(cp); 810 if (debug) 811 print_service("REDO", sep); 812 } else { 813 sep = enter(cp); 814 if (debug) 815 print_service("ADD ", sep); 816 } 817 sep->se_checked = 1; 818 819 switch (sep->se_family) { 820 case AF_LOCAL: 821 if (sep->se_fd != -1) 822 break; 823 n = strlen(sep->se_service); 824 if (n > sizeof(sep->se_ctrladdr_un.sun_path)) { 825 syslog(LOG_ERR, "%s: address too long", 826 sep->se_service); 827 sep->se_checked = 0; 828 continue; 829 } 830 (void)unlink(sep->se_service); 831 strncpy(sep->se_ctrladdr_un.sun_path, 832 sep->se_service, n); 833 sep->se_ctrladdr_un.sun_family = AF_LOCAL; 834 sep->se_ctrladdr_size = n + 835 sizeof(sep->se_ctrladdr_un) - 836 sizeof(sep->se_ctrladdr_un.sun_path); 837 if (!ISMUX(sep)) 838 setup(sep); 839 break; 840 case AF_INET: 841 sep->se_ctrladdr_in.sin_family = AF_INET; 842 if (!strcmp(sep->se_hostaddr,"*")) 843 sep->se_ctrladdr_in.sin_addr.s_addr = 844 INADDR_ANY; 845 else if (!inet_aton(sep->se_hostaddr, 846 &sep->se_ctrladdr_in.sin_addr)) { 847 /* Do we really want to support hostname lookups here? */ 848 struct hostent *hp; 849 hp = gethostbyname(sep->se_hostaddr); 850 if (hp == 0) { 851 syslog(LOG_ERR, "%s: unknown host", 852 sep->se_hostaddr); 853 sep->se_checked = 0; 854 continue; 855 } else if (hp->h_addrtype != AF_INET) { 856 syslog(LOG_ERR, 857 "%s: address isn't an Internet address", 858 sep->se_hostaddr); 859 sep->se_checked = 0; 860 continue; 861 } else if (hp->h_length != sizeof(struct in_addr)) { 862 syslog(LOG_ERR, 863 "%s: address size wrong (under DNS corruption attack?)", 864 sep->se_hostaddr); 865 sep->se_checked = 0; 866 continue; 867 } else { 868 memcpy(&sep->se_ctrladdr_in.sin_addr, 869 hp->h_addr_list[0], 870 sizeof(struct in_addr)); 871 } 872 } 873 if (ISMUX(sep)) { 874 sep->se_fd = -1; 875 continue; 876 } 877 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr_in); 878 if (isrpcservice(sep)) { 879 struct rpcent *rp; 880 881 sep->se_rpcprog = atoi(sep->se_service); 882 if (sep->se_rpcprog == 0) { 883 rp = getrpcbyname(sep->se_service); 884 if (rp == 0) { 885 syslog(LOG_ERR, 886 "%s/%s: unknown service", 887 sep->se_service, 888 sep->se_proto); 889 sep->se_checked = 0; 890 continue; 891 } 892 sep->se_rpcprog = rp->r_number; 893 } 894 if (sep->se_fd == -1 && !ISMUX(sep)) 895 setup(sep); 896 if (sep->se_fd != -1) 897 register_rpc(sep); 898 } else { 899 u_short port = htons(atoi(sep->se_service)); 900 901 if (!port) { 902 sp = getservbyname(sep->se_service, 903 sep->se_proto); 904 if (sp == 0) { 905 syslog(LOG_ERR, 906 "%s/%s: unknown service", 907 sep->se_service, 908 sep->se_proto); 909 sep->se_checked = 0; 910 continue; 911 } 912 port = sp->s_port; 913 } 914 if (port != sep->se_ctrladdr_in.sin_port) { 915 sep->se_ctrladdr_in.sin_port = port; 916 if (sep->se_fd >= 0) 917 close_sep(sep); 918 } 919 if (sep->se_fd == -1 && !ISMUX(sep)) 920 setup(sep); 921 } 922 } 923 } 924 endconfig(); 925 /* 926 * Purge anything not looked at above. 927 */ 928 omask = sigblock(SIGBLOCK); 929 sepp = &servtab; 930 while ((sep = *sepp)) { 931 if (sep->se_checked) { 932 sepp = &sep->se_next; 933 continue; 934 } 935 *sepp = sep->se_next; 936 if (sep->se_fd >= 0) 937 close_sep(sep); 938 if (isrpcservice(sep)) 939 unregister_rpc(sep); 940 if (sep->se_family == AF_LOCAL) 941 (void)unlink(sep->se_service); 942 if (debug) 943 print_service("FREE", sep); 944 freeconfig(sep); 945 free((char *)sep); 946 } 947 (void) sigsetmask(omask); 948 } 949 950 void 951 retry(signo) 952 int signo; 953 { 954 struct servtab *sep; 955 956 timingout = 0; 957 for (sep = servtab; sep; sep = sep->se_next) { 958 if (sep->se_fd == -1 && !ISMUX(sep)) { 959 switch (sep->se_family) { 960 case AF_LOCAL: 961 case AF_INET: 962 setup(sep); 963 if (sep->se_fd != -1 && isrpcservice(sep)) 964 register_rpc(sep); 965 break; 966 } 967 } 968 } 969 } 970 971 void 972 goaway(signo) 973 int signo; 974 { 975 struct servtab *sep; 976 977 for (sep = servtab; sep; sep = sep->se_next) { 978 if (sep->se_fd == -1) 979 continue; 980 981 switch (sep->se_family) { 982 case AF_LOCAL: 983 (void)unlink(sep->se_service); 984 break; 985 case AF_INET: 986 if (sep->se_wait == 1 && isrpcservice(sep)) 987 unregister_rpc(sep); 988 break; 989 } 990 (void)close(sep->se_fd); 991 } 992 (void)unlink(_PATH_INETDPID); 993 exit(0); 994 } 995 996 void 997 setup(sep) 998 struct servtab *sep; 999 { 1000 int on = 1; 1001 1002 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) { 1003 if (debug) 1004 fprintf(stderr, "socket failed on %s/%s: %s\n", 1005 sep->se_service, sep->se_proto, strerror(errno)); 1006 syslog(LOG_ERR, "%s/%s: socket: %m", 1007 sep->se_service, sep->se_proto); 1008 return; 1009 } 1010 /* Set all listening sockets to non-blocking and close-on-exec. */ 1011 if (fcntl(sep->se_fd, F_SETFL, O_NONBLOCK) < 0) 1012 syslog(LOG_ERR, "fcntl (F_SETFL, O_NONBLOCK): %m"); 1013 if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) 1014 syslog(LOG_ERR, "fcntl (F_SETFD, FD_CLOEXEC): %m"); 1015 1016 #define turnon(fd, opt) \ 1017 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 1018 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 1019 turnon(sep->se_fd, SO_DEBUG) < 0) 1020 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 1021 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 1022 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 1023 #undef turnon 1024 1025 /* Set the socket buffer sizes, if specified. */ 1026 if (sep->se_sndbuf != 0 && setsockopt(sep->se_fd, SOL_SOCKET, 1027 SO_SNDBUF, (char *)&sep->se_sndbuf, sizeof(sep->se_sndbuf)) < 0) 1028 syslog(LOG_ERR, "setsockopt (SO_SNDBUF %d): %m", 1029 sep->se_sndbuf); 1030 if (sep->se_rcvbuf != 0 && setsockopt(sep->se_fd, SOL_SOCKET, 1031 SO_RCVBUF, (char *)&sep->se_rcvbuf, sizeof(sep->se_rcvbuf)) < 0) 1032 syslog(LOG_ERR, "setsockopt (SO_RCVBUF %d): %m", 1033 sep->se_rcvbuf); 1034 1035 if (bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size) < 0) { 1036 if (debug) 1037 fprintf(stderr, "bind failed on %s/%s: %s\n", 1038 sep->se_service, sep->se_proto, strerror(errno)); 1039 syslog(LOG_ERR, "%s/%s: bind: %m", 1040 sep->se_service, sep->se_proto); 1041 (void) close(sep->se_fd); 1042 sep->se_fd = -1; 1043 if (!timingout) { 1044 timingout = 1; 1045 alarm(RETRYTIME); 1046 } 1047 return; 1048 } 1049 if (sep->se_socktype == SOCK_STREAM) 1050 listen(sep->se_fd, 10); 1051 1052 FD_SET(sep->se_fd, &allsock); 1053 nsock++; 1054 if (sep->se_fd > maxsock) { 1055 maxsock = sep->se_fd; 1056 if (maxsock > rlim_ofile_cur - FD_MARGIN) 1057 bump_nofile(); 1058 } 1059 if (debug) 1060 fprintf(stderr, "registered %s on %d\n", 1061 sep->se_server, sep->se_fd); 1062 } 1063 1064 /* 1065 * Finish with a service and its socket. 1066 */ 1067 void 1068 close_sep(sep) 1069 struct servtab *sep; 1070 { 1071 if (sep->se_fd >= 0) { 1072 nsock--; 1073 FD_CLR(sep->se_fd, &allsock); 1074 (void) close(sep->se_fd); 1075 sep->se_fd = -1; 1076 } 1077 sep->se_count = 0; 1078 /* 1079 * Don't keep the pid of this running deamon: when reapchild() 1080 * reaps this pid, it would erroneously increment nsock. 1081 */ 1082 if (sep->se_wait > 1) 1083 sep->se_wait = 1; 1084 } 1085 1086 void 1087 register_rpc(sep) 1088 struct servtab *sep; 1089 { 1090 #ifdef RPC 1091 int n; 1092 struct sockaddr_in sin; 1093 struct protoent *pp; 1094 1095 if ((pp = getprotobyname(sep->se_proto+4)) == NULL) { 1096 syslog(LOG_ERR, "%s: getproto: %m", 1097 sep->se_proto); 1098 return; 1099 } 1100 n = sizeof sin; 1101 if (getsockname(sep->se_fd, (struct sockaddr *)&sin, &n) < 0) { 1102 syslog(LOG_ERR, "%s/%s: getsockname: %m", 1103 sep->se_service, sep->se_proto); 1104 return; 1105 } 1106 1107 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1108 if (debug) 1109 fprintf(stderr, "pmap_set: %u %u %u %u\n", 1110 sep->se_rpcprog, n, pp->p_proto, 1111 ntohs(sin.sin_port)); 1112 (void)pmap_unset(sep->se_rpcprog, n); 1113 if (!pmap_set(sep->se_rpcprog, n, pp->p_proto, ntohs(sin.sin_port))) 1114 syslog(LOG_ERR, "pmap_set: %u %u %u %u: %m", 1115 sep->se_rpcprog, n, pp->p_proto, 1116 ntohs(sin.sin_port)); 1117 } 1118 #endif /* RPC */ 1119 } 1120 1121 void 1122 unregister_rpc(sep) 1123 struct servtab *sep; 1124 { 1125 #ifdef RPC 1126 int n; 1127 1128 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1129 if (debug) 1130 fprintf(stderr, "pmap_unset(%u, %u)\n", 1131 sep->se_rpcprog, n); 1132 if (!pmap_unset(sep->se_rpcprog, n)) 1133 syslog(LOG_ERR, "pmap_unset(%u, %u)\n", 1134 sep->se_rpcprog, n); 1135 } 1136 #endif /* RPC */ 1137 } 1138 1139 1140 struct servtab * 1141 enter(cp) 1142 struct servtab *cp; 1143 { 1144 struct servtab *sep; 1145 long omask; 1146 1147 sep = (struct servtab *)malloc(sizeof (*sep)); 1148 if (sep == (struct servtab *)0) { 1149 syslog(LOG_ERR, "Out of memory."); 1150 exit(-1); 1151 } 1152 *sep = *cp; 1153 sep->se_fd = -1; 1154 sep->se_rpcprog = -1; 1155 omask = sigblock(SIGBLOCK); 1156 sep->se_next = servtab; 1157 servtab = sep; 1158 sigsetmask(omask); 1159 return (sep); 1160 } 1161 1162 FILE *fconfig = NULL; 1163 struct servtab serv; 1164 char line[LINE_MAX]; 1165 char *defhost; 1166 1167 int 1168 setconfig() 1169 { 1170 if (defhost) free(defhost); 1171 defhost = newstr("*"); 1172 if (fconfig != NULL) { 1173 fseek(fconfig, 0L, SEEK_SET); 1174 return (1); 1175 } 1176 fconfig = fopen(CONFIG, "r"); 1177 return (fconfig != NULL); 1178 } 1179 1180 void 1181 endconfig() 1182 { 1183 if (fconfig) { 1184 (void) fclose(fconfig); 1185 fconfig = NULL; 1186 } 1187 if (defhost) { 1188 free(defhost); 1189 defhost = 0; 1190 } 1191 } 1192 1193 struct servtab * 1194 getconfigent() 1195 { 1196 struct servtab *sep = &serv; 1197 int argc, val; 1198 char *cp, *cp0, *arg, *buf0, *buf1, *sz0, *sz1; 1199 static char TCPMUX_TOKEN[] = "tcpmux/"; 1200 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) 1201 char *hostdelim; 1202 1203 more: 1204 #ifdef MULOG 1205 while ((cp = nextline(fconfig)) && (*cp == '#' || *cp == '\0')) { 1206 /* Avoid use of `skip' if there is a danger of it looking 1207 * at continuation lines. 1208 */ 1209 do { 1210 cp++; 1211 } while (*cp == ' ' || *cp == '\t'); 1212 if (*cp == '\0') 1213 continue; 1214 if ((arg = skip(&cp)) == NULL) 1215 continue; 1216 if (strcmp(arg, "DOMAIN")) 1217 continue; 1218 if (curdom) 1219 free(curdom); 1220 curdom = NULL; 1221 while (*cp == ' ' || *cp == '\t') 1222 cp++; 1223 if (*cp == '\0') 1224 continue; 1225 arg = cp; 1226 while (*cp && *cp != ' ' && *cp != '\t') 1227 cp++; 1228 if (*cp != '\0') 1229 *cp++ = '\0'; 1230 curdom = newstr(arg); 1231 } 1232 #else 1233 while ((cp = nextline(fconfig)) && (*cp == '#' || *cp == '\0')) 1234 ; 1235 #endif 1236 if (cp == NULL) 1237 return ((struct servtab *)0); 1238 /* 1239 * clear the static buffer, since some fields (se_ctrladdr, 1240 * for example) don't get initialized here. 1241 */ 1242 memset((caddr_t)sep, 0, sizeof *sep); 1243 arg = skip(&cp); 1244 if (cp == NULL) { 1245 /* got an empty line containing just blanks/tabs. */ 1246 goto more; 1247 } 1248 /* Check for a host name. */ 1249 hostdelim = strrchr(arg, ':'); 1250 if (hostdelim) { 1251 *hostdelim = '\0'; 1252 sep->se_hostaddr = newstr(arg); 1253 arg = hostdelim + 1; 1254 /* 1255 * If the line is of the form `host:', then just change the 1256 * default host for the following lines. 1257 */ 1258 if (*arg == '\0') { 1259 arg = skip(&cp); 1260 if (cp == NULL) { 1261 free(defhost); 1262 defhost = sep->se_hostaddr; 1263 goto more; 1264 } 1265 } 1266 } else 1267 sep->se_hostaddr = newstr(defhost); 1268 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1269 char *c = arg + MUX_LEN; 1270 if (*c == '+') { 1271 sep->se_type = MUXPLUS_TYPE; 1272 c++; 1273 } else 1274 sep->se_type = MUX_TYPE; 1275 sep->se_service = newstr(c); 1276 } else { 1277 sep->se_service = newstr(arg); 1278 sep->se_type = NORM_TYPE; 1279 } 1280 1281 arg = sskip(&cp); 1282 if (strcmp(arg, "stream") == 0) 1283 sep->se_socktype = SOCK_STREAM; 1284 else if (strcmp(arg, "dgram") == 0) 1285 sep->se_socktype = SOCK_DGRAM; 1286 else if (strcmp(arg, "rdm") == 0) 1287 sep->se_socktype = SOCK_RDM; 1288 else if (strcmp(arg, "seqpacket") == 0) 1289 sep->se_socktype = SOCK_SEQPACKET; 1290 else if (strcmp(arg, "raw") == 0) 1291 sep->se_socktype = SOCK_RAW; 1292 else 1293 sep->se_socktype = -1; 1294 1295 sep->se_proto = newstr(sskip(&cp)); 1296 1297 #define MALFORMED(arg) \ 1298 do { \ 1299 syslog(LOG_ERR, "%s: malformed buffer size option `%s'", \ 1300 sep->se_service, (arg)); \ 1301 goto more; \ 1302 } while (0) 1303 1304 #define GETVAL(arg) \ 1305 do { \ 1306 if (!isdigit(*(arg))) \ 1307 MALFORMED(arg); \ 1308 val = strtol((arg), &cp0, 10); \ 1309 if (cp0 != NULL) { \ 1310 if (cp0[1] != '\0') \ 1311 MALFORMED((arg)); \ 1312 if (cp0[0] == 'k') \ 1313 val *= 1024; \ 1314 if (cp0[0] == 'm') \ 1315 val *= 1024 * 1024; \ 1316 } \ 1317 if (val < 1) { \ 1318 syslog(LOG_ERR, "%s: invalid buffer size `%s'", \ 1319 sep->se_service, (arg)); \ 1320 goto more; \ 1321 } \ 1322 } while (0) 1323 1324 #define ASSIGN(arg) \ 1325 do { \ 1326 if (strcmp((arg), "sndbuf") == 0) \ 1327 sep->se_sndbuf = val; \ 1328 else if (strcmp((arg), "rcvbuf") == 0) \ 1329 sep->se_rcvbuf = val; \ 1330 else \ 1331 MALFORMED((arg)); \ 1332 } while (0) 1333 1334 /* 1335 * Extract the send and receive buffer sizes before parsing 1336 * the protocol. 1337 */ 1338 sep->se_sndbuf = sep->se_rcvbuf = 0; 1339 buf0 = buf1 = sz0 = sz1 = NULL; 1340 if ((buf0 = strchr(sep->se_proto, ',')) != NULL) { 1341 /* Not meaningful for Tcpmux services. */ 1342 if (sep->se_type != NORM_TYPE) { 1343 syslog(LOG_ERR, "%s: can't specify buffer sizes for " 1344 "tcpmux services", sep->se_service); 1345 goto more; 1346 } 1347 1348 /* Skip the , */ 1349 *buf0++ = '\0'; 1350 1351 /* Check to see if another socket buffer size was specified. */ 1352 if ((buf1 = strchr(buf0, ',')) != NULL) { 1353 /* Skip the , */ 1354 *buf1++ = '\0'; 1355 1356 /* Make sure a 3rd one wasn't specified. */ 1357 if (strchr(buf1, ',') != NULL) { 1358 syslog(LOG_ERR, "%s: too many buffer sizes", 1359 sep->se_service); 1360 goto more; 1361 } 1362 1363 /* Locate the size. */ 1364 if ((sz1 = strchr(buf1, '=')) == NULL) 1365 MALFORMED(buf1); 1366 1367 /* Skip the = */ 1368 *sz1++ = '\0'; 1369 } 1370 1371 /* Locate the size. */ 1372 if ((sz0 = strchr(buf0, '=')) == NULL) 1373 MALFORMED(buf0); 1374 1375 /* Skip the = */ 1376 *sz0++ = '\0'; 1377 1378 GETVAL(sz0); 1379 ASSIGN(buf0); 1380 1381 if (buf1 != NULL) { 1382 GETVAL(sz1); 1383 ASSIGN(buf1); 1384 } 1385 } 1386 1387 #undef ASSIGN 1388 #undef GETVAL 1389 #undef MALFORMED 1390 1391 if (strcmp(sep->se_proto, "unix") == 0) { 1392 sep->se_family = AF_LOCAL; 1393 } else { 1394 sep->se_family = AF_INET; 1395 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1396 #ifdef RPC 1397 char *cp, *ccp; 1398 cp = strchr(sep->se_service, '/'); 1399 if (cp == 0) { 1400 syslog(LOG_ERR, "%s: no rpc version", 1401 sep->se_service); 1402 goto more; 1403 } 1404 *cp++ = '\0'; 1405 sep->se_rpcversl = sep->se_rpcversh = 1406 strtol(cp, &ccp, 0); 1407 if (ccp == cp) { 1408 badafterall: 1409 syslog(LOG_ERR, "%s/%s: bad rpc version", 1410 sep->se_service, cp); 1411 goto more; 1412 } 1413 if (*ccp == '-') { 1414 cp = ccp + 1; 1415 sep->se_rpcversh = strtol(cp, &ccp, 0); 1416 if (ccp == cp) 1417 goto badafterall; 1418 } 1419 #else 1420 syslog(LOG_ERR, "%s: rpc services not suported", 1421 sep->se_service); 1422 goto more; 1423 #endif /* RPC */ 1424 } 1425 } 1426 arg = sskip(&cp); 1427 { 1428 char *cp; 1429 cp = strchr(arg, '.'); 1430 if (cp) { 1431 *cp++ = '\0'; 1432 sep->se_max = atoi(cp); 1433 } else 1434 sep->se_max = TOOMANY; 1435 } 1436 sep->se_wait = strcmp(arg, "wait") == 0; 1437 if (ISMUX(sep)) { 1438 /* 1439 * Silently enforce "nowait" for TCPMUX services since 1440 * they don't have an assigned port to listen on. 1441 */ 1442 sep->se_wait = 0; 1443 1444 if (strcmp(sep->se_proto, "tcp")) { 1445 syslog(LOG_ERR, 1446 "%s: bad protocol for tcpmux service %s", 1447 CONFIG, sep->se_service); 1448 goto more; 1449 } 1450 if (sep->se_socktype != SOCK_STREAM) { 1451 syslog(LOG_ERR, 1452 "%s: bad socket type for tcpmux service %s", 1453 CONFIG, sep->se_service); 1454 goto more; 1455 } 1456 } 1457 sep->se_user = newstr(sskip(&cp)); 1458 if ((sep->se_group = strchr(sep->se_user, '.'))) 1459 *sep->se_group++ = '\0'; 1460 sep->se_server = newstr(sskip(&cp)); 1461 if (strcmp(sep->se_server, "internal") == 0) { 1462 struct biltin *bi; 1463 1464 for (bi = biltins; bi->bi_service; bi++) 1465 if (bi->bi_socktype == sep->se_socktype && 1466 strcmp(bi->bi_service, sep->se_service) == 0) 1467 break; 1468 if (bi->bi_service == 0) { 1469 syslog(LOG_ERR, "internal service %s unknown", 1470 sep->se_service); 1471 goto more; 1472 } 1473 sep->se_bi = bi; 1474 sep->se_wait = bi->bi_wait; 1475 } else 1476 sep->se_bi = NULL; 1477 argc = 0; 1478 for (arg = skip(&cp); cp; arg = skip(&cp)) { 1479 #if MULOG 1480 char *colon; 1481 1482 if (argc == 0 && (colon = strrchr(arg, ':'))) { 1483 while (arg < colon) { 1484 int x; 1485 char *ccp; 1486 1487 switch (*arg++) { 1488 case 'l': 1489 x = 1; 1490 if (isdigit(*arg)) { 1491 x = strtol(arg, &ccp, 0); 1492 if (ccp == arg) 1493 break; 1494 arg = ccp; 1495 } 1496 sep->se_log &= ~MULOG_RFC931; 1497 sep->se_log |= x; 1498 break; 1499 case 'a': 1500 sep->se_log |= MULOG_RFC931; 1501 break; 1502 default: 1503 break; 1504 } 1505 } 1506 arg = colon + 1; 1507 } 1508 #endif 1509 if (argc < MAXARGV) 1510 sep->se_argv[argc++] = newstr(arg); 1511 } 1512 while (argc <= MAXARGV) 1513 sep->se_argv[argc++] = NULL; 1514 return (sep); 1515 } 1516 1517 void 1518 freeconfig(cp) 1519 struct servtab *cp; 1520 { 1521 int i; 1522 1523 if (cp->se_hostaddr) 1524 free(cp->se_hostaddr); 1525 if (cp->se_service) 1526 free(cp->se_service); 1527 if (cp->se_proto) 1528 free(cp->se_proto); 1529 if (cp->se_user) 1530 free(cp->se_user); 1531 /* Note: se_group is part of the newstr'ed se_user */ 1532 if (cp->se_server) 1533 free(cp->se_server); 1534 for (i = 0; i < MAXARGV; i++) 1535 if (cp->se_argv[i]) 1536 free(cp->se_argv[i]); 1537 } 1538 1539 1540 /* 1541 * Safe skip - if skip returns null, log a syntax error in the 1542 * configuration file and exit. 1543 */ 1544 char * 1545 sskip(cpp) 1546 char **cpp; 1547 { 1548 char *cp; 1549 1550 cp = skip(cpp); 1551 if (cp == NULL) { 1552 syslog(LOG_ERR, "%s: syntax error", CONFIG); 1553 exit(-1); 1554 } 1555 return (cp); 1556 } 1557 1558 char * 1559 skip(cpp) 1560 char **cpp; 1561 { 1562 char *cp = *cpp; 1563 char *start; 1564 1565 if (*cpp == NULL) 1566 return ((char *)0); 1567 1568 again: 1569 while (*cp == ' ' || *cp == '\t') 1570 cp++; 1571 if (*cp == '\0') { 1572 int c; 1573 1574 c = getc(fconfig); 1575 (void) ungetc(c, fconfig); 1576 if (c == ' ' || c == '\t') 1577 if ((cp = nextline(fconfig))) 1578 goto again; 1579 *cpp = (char *)0; 1580 return ((char *)0); 1581 } 1582 start = cp; 1583 while (*cp && *cp != ' ' && *cp != '\t') 1584 cp++; 1585 if (*cp != '\0') 1586 *cp++ = '\0'; 1587 *cpp = cp; 1588 return (start); 1589 } 1590 1591 char * 1592 nextline(fd) 1593 FILE *fd; 1594 { 1595 char *cp; 1596 1597 if (fgets(line, sizeof (line), fd) == NULL) 1598 return ((char *)0); 1599 cp = strchr(line, '\n'); 1600 if (cp) 1601 *cp = '\0'; 1602 return (line); 1603 } 1604 1605 char * 1606 newstr(cp) 1607 char *cp; 1608 { 1609 if ((cp = strdup(cp ? cp : ""))) 1610 return (cp); 1611 syslog(LOG_ERR, "strdup: %m"); 1612 exit(-1); 1613 } 1614 1615 void 1616 inetd_setproctitle(a, s) 1617 char *a; 1618 int s; 1619 { 1620 int size; 1621 char *cp; 1622 struct sockaddr_in sin; 1623 char buf[80]; 1624 1625 cp = Argv[0]; 1626 size = sizeof(sin); 1627 if (getpeername(s, (struct sockaddr *)&sin, &size) == 0) 1628 (void)snprintf(buf, sizeof buf, "-%s [%s]", a, 1629 inet_ntoa(sin.sin_addr)); 1630 else 1631 (void)snprintf(buf, sizeof buf, "-%s", a); 1632 strncpy(cp, buf, LastArg - cp); 1633 cp += strlen(cp); 1634 while (cp < LastArg) 1635 *cp++ = ' '; 1636 } 1637 1638 void 1639 logpid() 1640 { 1641 FILE *fp; 1642 1643 if ((fp = fopen(_PATH_INETDPID, "w")) != NULL) { 1644 fprintf(fp, "%u\n", getpid()); 1645 (void)fclose(fp); 1646 } 1647 } 1648 1649 void 1650 bump_nofile() 1651 { 1652 #ifdef RLIMIT_NOFILE 1653 1654 #define FD_CHUNK 32 1655 1656 struct rlimit rl; 1657 1658 if (getrlimit(RLIMIT_NOFILE, &rl) < 0) { 1659 syslog(LOG_ERR, "getrlimit: %m"); 1660 return; 1661 } 1662 rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK); 1663 if (rl.rlim_cur <= rlim_ofile_cur) { 1664 syslog(LOG_ERR, 1665 "bump_nofile: cannot extend file limit, max = %d", 1666 (int)rl.rlim_cur); 1667 return; 1668 } 1669 1670 if (setrlimit(RLIMIT_NOFILE, &rl) < 0) { 1671 syslog(LOG_ERR, "setrlimit: %m"); 1672 return; 1673 } 1674 1675 rlim_ofile_cur = rl.rlim_cur; 1676 return; 1677 1678 #else 1679 syslog(LOG_ERR, "bump_nofile: cannot extend file limit"); 1680 return; 1681 #endif 1682 } 1683 1684 /* 1685 * Internet services provided internally by inetd: 1686 */ 1687 #define BUFSIZE 4096 1688 1689 /* ARGSUSED */ 1690 void 1691 echo_stream(s, sep) /* Echo service -- echo data back */ 1692 int s; 1693 struct servtab *sep; 1694 { 1695 char buffer[BUFSIZE]; 1696 int i; 1697 1698 inetd_setproctitle(sep->se_service, s); 1699 while ((i = read(s, buffer, sizeof(buffer))) > 0 && 1700 write(s, buffer, i) > 0) 1701 ; 1702 } 1703 1704 /* ARGSUSED */ 1705 void 1706 echo_dg(s, sep) /* Echo service -- echo data back */ 1707 int s; 1708 struct servtab *sep; 1709 { 1710 char buffer[BUFSIZE]; 1711 int i, size; 1712 struct sockaddr sa; 1713 1714 size = sizeof(sa); 1715 if ((i = recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size)) < 0) 1716 return; 1717 (void) sendto(s, buffer, i, 0, &sa, sizeof(sa)); 1718 } 1719 1720 /* ARGSUSED */ 1721 void 1722 discard_stream(s, sep) /* Discard service -- ignore data */ 1723 int s; 1724 struct servtab *sep; 1725 { 1726 char buffer[BUFSIZE]; 1727 1728 inetd_setproctitle(sep->se_service, s); 1729 while ((errno = 0, read(s, buffer, sizeof(buffer)) > 0) || 1730 errno == EINTR) 1731 ; 1732 } 1733 1734 /* ARGSUSED */ 1735 void 1736 discard_dg(s, sep) /* Discard service -- ignore data */ 1737 int s; 1738 struct servtab *sep; 1739 { 1740 char buffer[BUFSIZE]; 1741 1742 (void) read(s, buffer, sizeof(buffer)); 1743 } 1744 1745 #include <ctype.h> 1746 #define LINESIZ 72 1747 char ring[128]; 1748 char *endring; 1749 1750 void 1751 initring() 1752 { 1753 int i; 1754 1755 endring = ring; 1756 1757 for (i = 0; i <= 128; ++i) 1758 if (isprint(i)) 1759 *endring++ = i; 1760 } 1761 1762 /* ARGSUSED */ 1763 void 1764 chargen_stream(s, sep) /* Character generator */ 1765 int s; 1766 struct servtab *sep; 1767 { 1768 int len; 1769 char *rs, text[LINESIZ+2]; 1770 1771 inetd_setproctitle(sep->se_service, s); 1772 1773 if (!endring) { 1774 initring(); 1775 rs = ring; 1776 } 1777 1778 text[LINESIZ] = '\r'; 1779 text[LINESIZ + 1] = '\n'; 1780 for (rs = ring;;) { 1781 if ((len = endring - rs) >= LINESIZ) 1782 memmove(text, rs, LINESIZ); 1783 else { 1784 memmove(text, rs, len); 1785 memmove(text + len, ring, LINESIZ - len); 1786 } 1787 if (++rs == endring) 1788 rs = ring; 1789 if (write(s, text, sizeof(text)) != sizeof(text)) 1790 break; 1791 } 1792 } 1793 1794 /* ARGSUSED */ 1795 void 1796 chargen_dg(s, sep) /* Character generator */ 1797 int s; 1798 struct servtab *sep; 1799 { 1800 struct sockaddr sa; 1801 static char *rs; 1802 int len, size; 1803 char text[LINESIZ+2]; 1804 1805 if (endring == 0) { 1806 initring(); 1807 rs = ring; 1808 } 1809 1810 size = sizeof(sa); 1811 if (recvfrom(s, text, sizeof(text), 0, &sa, &size) < 0) 1812 return; 1813 1814 if ((len = endring - rs) >= LINESIZ) 1815 memmove(text, rs, LINESIZ); 1816 else { 1817 memmove(text, rs, len); 1818 memmove(text + len, ring, LINESIZ - len); 1819 } 1820 if (++rs == endring) 1821 rs = ring; 1822 text[LINESIZ] = '\r'; 1823 text[LINESIZ + 1] = '\n'; 1824 (void) sendto(s, text, sizeof(text), 0, &sa, sizeof(sa)); 1825 } 1826 1827 /* 1828 * Return a machine readable date and time, in the form of the 1829 * number of seconds since midnight, Jan 1, 1900. Since gettimeofday 1830 * returns the number of seconds since midnight, Jan 1, 1970, 1831 * we must add 2208988800 seconds to this figure to make up for 1832 * some seventy years Bell Labs was asleep. 1833 */ 1834 1835 long 1836 machtime() 1837 { 1838 struct timeval tv; 1839 1840 if (gettimeofday(&tv, (struct timezone *)0) < 0) { 1841 if (debug) 1842 fprintf(stderr, "Unable to get time of day\n"); 1843 return (0L); 1844 } 1845 #define OFFSET ((u_long)25567 * 24*60*60) 1846 return (htonl((long)(tv.tv_sec + OFFSET))); 1847 #undef OFFSET 1848 } 1849 1850 /* ARGSUSED */ 1851 void 1852 machtime_stream(s, sep) 1853 int s; 1854 struct servtab *sep; 1855 { 1856 long result; 1857 1858 result = machtime(); 1859 (void) write(s, (char *) &result, sizeof(result)); 1860 } 1861 1862 /* ARGSUSED */ 1863 void 1864 machtime_dg(s, sep) 1865 int s; 1866 struct servtab *sep; 1867 { 1868 long result; 1869 struct sockaddr sa; 1870 int size; 1871 1872 size = sizeof(sa); 1873 if (recvfrom(s, (char *)&result, sizeof(result), 0, &sa, &size) < 0) 1874 return; 1875 result = machtime(); 1876 (void) sendto(s, (char *) &result, sizeof(result), 0, &sa, sizeof(sa)); 1877 } 1878 1879 /* ARGSUSED */ 1880 void 1881 daytime_stream(s, sep) /* Return human-readable time of day */ 1882 int s; 1883 struct servtab *sep; 1884 { 1885 char buffer[256]; 1886 time_t clock; 1887 int len; 1888 1889 clock = time((time_t *) 0); 1890 1891 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 1892 (void) write(s, buffer, len); 1893 } 1894 1895 /* ARGSUSED */ 1896 void 1897 daytime_dg(s, sep) /* Return human-readable time of day */ 1898 int s; 1899 struct servtab *sep; 1900 { 1901 char buffer[256]; 1902 time_t clock; 1903 struct sockaddr sa; 1904 int size, len; 1905 1906 clock = time((time_t *) 0); 1907 1908 size = sizeof(sa); 1909 if (recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size) < 0) 1910 return; 1911 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 1912 (void) sendto(s, buffer, len, 0, &sa, sizeof(sa)); 1913 } 1914 1915 /* 1916 * print_service: 1917 * Dump relevant information to stderr 1918 */ 1919 void 1920 print_service(action, sep) 1921 char *action; 1922 struct servtab *sep; 1923 { 1924 if (isrpcservice(sep)) 1925 fprintf(stderr, 1926 "%s: %s rpcprog=%d, rpcvers = %d/%d, proto=%s, wait.max=%d.%d, user.group=%s.%s builtin=%lx server=%s\n", 1927 action, sep->se_service, 1928 sep->se_rpcprog, sep->se_rpcversh, sep->se_rpcversl, sep->se_proto, 1929 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 1930 (long)sep->se_bi, sep->se_server); 1931 else 1932 fprintf(stderr, 1933 "%s: %s proto=%s, wait.max=%d.%d, user.group=%s.%s builtin=%lx server=%s\n", 1934 action, sep->se_service, sep->se_proto, 1935 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 1936 (long)sep->se_bi, sep->se_server); 1937 } 1938 1939 void 1940 usage() 1941 { 1942 1943 #ifdef LIBWRAP 1944 (void)fprintf(stderr, "usage: %s [-dl] [conf]\n", __progname); 1945 #else 1946 (void)fprintf(stderr, "usage: %s [-d] [conf]\n", __progname); 1947 #endif 1948 exit(1); 1949 } 1950 1951 1952 /* 1953 * Based on TCPMUX.C by Mark K. Lottor November 1988 1954 * sri-nic::ps:<mkl>tcpmux.c 1955 */ 1956 1957 static int /* # of characters upto \r,\n or \0 */ 1958 getline(fd, buf, len) 1959 int fd; 1960 char *buf; 1961 int len; 1962 { 1963 int count = 0, n; 1964 1965 do { 1966 n = read(fd, buf, len-count); 1967 if (n == 0) 1968 return (count); 1969 if (n < 0) 1970 return (-1); 1971 while (--n >= 0) { 1972 if (*buf == '\r' || *buf == '\n' || *buf == '\0') 1973 return (count); 1974 count++; 1975 buf++; 1976 } 1977 } while (count < len); 1978 return (count); 1979 } 1980 1981 #define MAX_SERV_LEN (256+2) /* 2 bytes for \r\n */ 1982 1983 #define strwrite(fd, buf) (void) write(fd, buf, sizeof(buf)-1) 1984 1985 void 1986 tcpmux(ctrl, sep) 1987 int ctrl; 1988 struct servtab *sep; 1989 { 1990 char service[MAX_SERV_LEN+1]; 1991 int len; 1992 1993 /* Get requested service name */ 1994 if ((len = getline(ctrl, service, MAX_SERV_LEN)) < 0) { 1995 strwrite(ctrl, "-Error reading service name\r\n"); 1996 goto reject; 1997 } 1998 service[len] = '\0'; 1999 2000 if (debug) 2001 fprintf(stderr, "tcpmux: someone wants %s\n", service); 2002 2003 /* 2004 * Help is a required command, and lists available services, 2005 * one per line. 2006 */ 2007 if (!strcasecmp(service, "help")) { 2008 strwrite(ctrl, "+Available services:\r\n"); 2009 strwrite(ctrl, "help\r\n"); 2010 for (sep = servtab; sep; sep = sep->se_next) { 2011 if (!ISMUX(sep)) 2012 continue; 2013 (void)write(ctrl, sep->se_service, 2014 strlen(sep->se_service)); 2015 strwrite(ctrl, "\r\n"); 2016 } 2017 goto reject; 2018 } 2019 2020 /* Try matching a service in inetd.conf with the request */ 2021 for (sep = servtab; sep; sep = sep->se_next) { 2022 if (!ISMUX(sep)) 2023 continue; 2024 if (!strcasecmp(service, sep->se_service)) { 2025 if (ISMUXPLUS(sep)) 2026 strwrite(ctrl, "+Go\r\n"); 2027 run_service(ctrl, sep); 2028 return; 2029 } 2030 } 2031 strwrite(ctrl, "-Service not available\r\n"); 2032 reject: 2033 _exit(1); 2034 } 2035 2036 2037 #ifdef MULOG 2038 dolog(sep, ctrl) 2039 struct servtab *sep; 2040 int ctrl; 2041 { 2042 struct sockaddr sa; 2043 struct sockaddr_in *sin = (struct sockaddr_in *)&sa; 2044 int len = sizeof(sa); 2045 struct hostent *hp; 2046 char *host, *dp, buf[BUFSIZ], *rfc931_name(); 2047 int connected = 1; 2048 2049 if (sep->se_family != AF_INET) 2050 return; 2051 2052 if (getpeername(ctrl, &sa, &len) < 0) { 2053 if (errno != ENOTCONN) { 2054 syslog(LOG_ERR, "getpeername: %m"); 2055 return; 2056 } 2057 if (recvfrom(ctrl, buf, sizeof(buf), MSG_PEEK, &sa, &len) < 0) { 2058 syslog(LOG_ERR, "recvfrom: %m"); 2059 return; 2060 } 2061 connected = 0; 2062 } 2063 if (sa.sa_family != AF_INET) { 2064 syslog(LOG_ERR, "unexpected address family %u", sa.sa_family); 2065 return; 2066 } 2067 2068 hp = gethostbyaddr((char *) &sin->sin_addr.s_addr, 2069 sizeof (sin->sin_addr.s_addr), AF_INET); 2070 2071 host = hp?hp->h_name:inet_ntoa(sin->sin_addr); 2072 2073 switch (sep->se_log & ~MULOG_RFC931) { 2074 case 0: 2075 return; 2076 case 1: 2077 if (curdom == NULL || *curdom == '\0') 2078 break; 2079 dp = host + strlen(host) - strlen(curdom); 2080 if (dp < host) 2081 break; 2082 if (debug) 2083 fprintf(stderr, "check \"%s\" against curdom \"%s\"\n", 2084 host, curdom); 2085 if (strcasecmp(dp, curdom) == 0) 2086 return; 2087 break; 2088 case 2: 2089 default: 2090 break; 2091 } 2092 2093 openlog("", LOG_NOWAIT, MULOG); 2094 2095 if (connected && (sep->se_log & MULOG_RFC931)) 2096 syslog(LOG_INFO, "%s@%s wants %s", 2097 rfc931_name(sin, ctrl), host, sep->se_service); 2098 else 2099 syslog(LOG_INFO, "%s wants %s", 2100 host, sep->se_service); 2101 } 2102 2103 /* 2104 * From tcp_log by 2105 * Wietse Venema, Eindhoven University of Technology, The Netherlands. 2106 */ 2107 #if 0 2108 static char sccsid[] = "@(#) rfc931.c 1.3 92/08/31 22:54:46"; 2109 #endif 2110 2111 #include <setjmp.h> 2112 2113 #define RFC931_PORT 113 /* Semi-well-known port */ 2114 #define TIMEOUT 4 2115 #define TIMEOUT2 10 2116 2117 static jmp_buf timebuf; 2118 2119 /* timeout - handle timeouts */ 2120 2121 static void timeout(sig) 2122 int sig; 2123 { 2124 longjmp(timebuf, sig); 2125 } 2126 2127 /* rfc931_name - return remote user name */ 2128 2129 char * 2130 rfc931_name(there, ctrl) 2131 struct sockaddr_in *there; /* remote link information */ 2132 int ctrl; 2133 { 2134 struct sockaddr_in here; /* local link information */ 2135 struct sockaddr_in sin; /* for talking to RFC931 daemon */ 2136 int length; 2137 int s; 2138 unsigned remote; 2139 unsigned local; 2140 static char user[256]; /* XXX */ 2141 char buf[256]; 2142 char *cp; 2143 char *result = "USER_UNKNOWN"; 2144 int len; 2145 2146 /* Find out local port number of our stdin. */ 2147 2148 length = sizeof(here); 2149 if (getsockname(ctrl, (struct sockaddr *) &here, &length) == -1) { 2150 syslog(LOG_ERR, "getsockname: %m"); 2151 return (result); 2152 } 2153 /* Set up timer so we won't get stuck. */ 2154 2155 if ((s = socket(AF_INET, SOCK_STREAM, 0)) == -1) { 2156 syslog(LOG_ERR, "socket: %m"); 2157 return (result); 2158 } 2159 2160 sin = here; 2161 sin.sin_port = htons(0); 2162 if (bind(s, (struct sockaddr *) &sin, sizeof(sin)) == -1) { 2163 syslog(LOG_ERR, "bind: %m"); 2164 return (result); 2165 } 2166 2167 signal(SIGALRM, timeout); 2168 if (setjmp(timebuf)) { 2169 close(s); /* not: fclose(fp) */ 2170 return (result); 2171 } 2172 alarm(TIMEOUT); 2173 2174 /* Connect to the RFC931 daemon. */ 2175 2176 sin = *there; 2177 sin.sin_port = htons(RFC931_PORT); 2178 if (connect(s, (struct sockaddr *) &sin, sizeof(sin)) == -1) { 2179 close(s); 2180 alarm(0); 2181 return (result); 2182 } 2183 2184 /* Query the RFC 931 server. Would 13-byte writes ever be broken up? */ 2185 (void)snprintf(buf, sizeof buf, "%u,%u\r\n", ntohs(there->sin_port), 2186 ntohs(here.sin_port)); 2187 2188 2189 for (len = 0, cp = buf; len < strlen(buf); ) { 2190 int n; 2191 2192 if ((n = write(s, cp, strlen(buf) - len)) == -1) { 2193 close(s); 2194 alarm(0); 2195 return (result); 2196 } 2197 cp += n; 2198 len += n; 2199 } 2200 2201 /* Read response */ 2202 for (cp = buf; cp < buf + sizeof(buf) - 1; ) { 2203 char c; 2204 if (read(s, &c, 1) != 1) { 2205 close(s); 2206 alarm(0); 2207 return (result); 2208 } 2209 if (c == '\n') 2210 break; 2211 *cp++ = c; 2212 } 2213 *cp = '\0'; 2214 2215 if (sscanf(buf, "%u , %u : USERID :%*[^:]:%255s", &remote, &local, user) == 3 2216 && ntohs(there->sin_port) == remote 2217 && ntohs(here.sin_port) == local) { 2218 2219 /* Strip trailing carriage return. */ 2220 if (cp = strchr(user, '\r')) 2221 *cp = 0; 2222 result = user; 2223 } 2224 2225 alarm(0); 2226 close(s); 2227 return (result); 2228 } 2229 #endif 2230
Indexes created Fri Sep 26 08:10:20 GMT 2025