inetd.c revision 1.42
1 /* $NetBSD: inetd.c,v 1.42 1998/05/01 01:57:26 thorpej 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 1.42 1998/05/01 01:57:26 thorpej 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 } else 539 ctrl = sep->se_fd; 540 (void) sigblock(SIGBLOCK); 541 pid = 0; 542 #ifdef LIBWRAP_INTERNAL 543 dofork = 1; 544 #else 545 dofork = (sep->se_bi == 0 || sep->se_bi->bi_fork); 546 #endif 547 if (dofork) { 548 if (sep->se_count++ == 0) 549 (void)gettimeofday(&sep->se_time, 550 (struct timezone *)0); 551 else if (sep->se_count >= sep->se_max) { 552 struct timeval now; 553 554 (void)gettimeofday(&now, (struct timezone *)0); 555 if (now.tv_sec - sep->se_time.tv_sec > 556 CNT_INTVL) { 557 sep->se_time = now; 558 sep->se_count = 1; 559 } else { 560 syslog(LOG_ERR, 561 "%s/%s server failing (looping), service terminated\n", 562 sep->se_service, sep->se_proto); 563 close_sep(sep); 564 sigsetmask(0L); 565 if (!timingout) { 566 timingout = 1; 567 alarm(RETRYTIME); 568 } 569 continue; 570 } 571 } 572 pid = fork(); 573 if (pid < 0) { 574 syslog(LOG_ERR, "fork: %m"); 575 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 576 close(ctrl); 577 sigsetmask(0L); 578 sleep(1); 579 continue; 580 } 581 if (pid != 0 && sep->se_wait) { 582 sep->se_wait = pid; 583 FD_CLR(sep->se_fd, &allsock); 584 nsock--; 585 } 586 if (pid == 0) { 587 sv.sv_mask = 0L; 588 sv.sv_handler = SIG_DFL; 589 sigvec(SIGPIPE, &sv, (struct sigvec *)0); 590 if (debug) 591 setsid(); 592 } 593 } 594 sigsetmask(0L); 595 if (pid == 0) { 596 run_service(ctrl, sep); 597 if (dofork) 598 exit(0); 599 } 600 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 601 close(ctrl); 602 } 603 } 604 } 605 } 606 607 void 608 run_service(ctrl, sep) 609 int ctrl; 610 struct servtab *sep; 611 { 612 struct passwd *pwd; 613 struct group *grp = NULL; /* XXX gcc */ 614 char buf[7]; 615 #ifdef LIBWRAP 616 struct request_info req; 617 int denied; 618 char *service = NULL; /* XXX gcc */ 619 #endif 620 621 #ifdef LIBWRAP 622 #ifndef LIBWRAP_INTERNAL 623 if (sep->se_bi == 0) 624 #endif 625 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 626 request_init(&req, RQ_DAEMON, sep->se_argv[0] ? 627 sep->se_argv[0] : sep->se_service, RQ_FILE, ctrl, NULL); 628 fromhost(&req); 629 denied = !hosts_access(&req); 630 if (denied || lflag) { 631 sp = getservbyport(sep->se_ctrladdr_in.sin_port, 632 sep->se_proto); 633 if (sp == NULL) { 634 (void)snprintf(buf, sizeof buf, "%d", 635 ntohs(sep->se_ctrladdr_in.sin_port)); 636 service = buf; 637 } else 638 service = sp->s_name; 639 } 640 if (denied) { 641 syslog(deny_severity, 642 "refused connection from %.500s, service %s (%s)", 643 eval_client(&req), service, sep->se_proto); 644 goto reject; 645 } 646 if (lflag) { 647 syslog(allow_severity, 648 "connection from %.500s, service %s (%s)", 649 eval_client(&req), service, sep->se_proto); 650 } 651 } 652 #endif /* LIBWRAP */ 653 654 if (sep->se_bi) { 655 (*sep->se_bi->bi_fn)(ctrl, sep); 656 } else { 657 if ((pwd = getpwnam(sep->se_user)) == NULL) { 658 syslog(LOG_ERR, "%s/%s: %s: No such user", 659 sep->se_service, sep->se_proto, sep->se_user); 660 goto reject; 661 } 662 if (sep->se_group && 663 (grp = getgrnam(sep->se_group)) == NULL) { 664 syslog(LOG_ERR, "%s/%s: %s: No such group", 665 sep->se_service, sep->se_proto, sep->se_group); 666 goto reject; 667 } 668 if (pwd->pw_uid) { 669 if (sep->se_group) 670 pwd->pw_gid = grp->gr_gid; 671 if (setgid(pwd->pw_gid) < 0) { 672 syslog(LOG_ERR, 673 "%s/%s: can't set gid %d: %m", sep->se_service, 674 sep->se_proto, pwd->pw_gid); 675 goto reject; 676 } 677 (void) initgroups(pwd->pw_name, 678 pwd->pw_gid); 679 if (setuid(pwd->pw_uid) < 0) { 680 syslog(LOG_ERR, 681 "%s/%s: can't set uid %d: %m", sep->se_service, 682 sep->se_proto, pwd->pw_uid); 683 goto reject; 684 } 685 } else if (sep->se_group) { 686 (void) setgid((gid_t)grp->gr_gid); 687 } 688 if (debug) 689 fprintf(stderr, "%d execl %s\n", 690 getpid(), sep->se_server); 691 #ifdef MULOG 692 if (sep->se_log) 693 dolog(sep, ctrl); 694 #endif 695 /* Set our control descriptor to not close-on-exec... */ 696 if (fcntl(ctrl, F_SETFD, 0) < 0) 697 syslog(LOG_ERR, "fcntl (F_SETFD, 0): %m"); 698 /* ...and dup it to stdin, stdout, and stderr. */ 699 if (ctrl != 0) { 700 dup2(ctrl, 0); 701 close(ctrl); 702 ctrl = 0; 703 } 704 dup2(0, 1); 705 dup2(0, 2); 706 #ifdef RLIMIT_NOFILE 707 if (rlim_ofile.rlim_cur != rlim_ofile_cur && 708 setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) 709 syslog(LOG_ERR, "setrlimit: %m"); 710 #endif 711 execv(sep->se_server, sep->se_argv); 712 syslog(LOG_ERR, "cannot execute %s: %m", sep->se_server); 713 reject: 714 if (sep->se_socktype != SOCK_STREAM) 715 recv(ctrl, buf, sizeof (buf), 0); 716 _exit(1); 717 } 718 } 719 720 void 721 reapchild(signo) 722 int signo; 723 { 724 int status; 725 pid_t pid; 726 struct servtab *sep; 727 728 for (;;) { 729 pid = wait3(&status, WNOHANG, (struct rusage *)0); 730 if (pid <= 0) 731 break; 732 if (debug) 733 fprintf(stderr, "%d reaped, status %#x\n", 734 pid, status); 735 for (sep = servtab; sep; sep = sep->se_next) 736 if (sep->se_wait == pid) { 737 if (WIFEXITED(status) && WEXITSTATUS(status)) 738 syslog(LOG_WARNING, 739 "%s: exit status 0x%x", 740 sep->se_server, WEXITSTATUS(status)); 741 else if (WIFSIGNALED(status)) 742 syslog(LOG_WARNING, 743 "%s: exit signal 0x%x", 744 sep->se_server, WTERMSIG(status)); 745 sep->se_wait = 1; 746 FD_SET(sep->se_fd, &allsock); 747 nsock++; 748 if (debug) 749 fprintf(stderr, "restored %s, fd %d\n", 750 sep->se_service, sep->se_fd); 751 } 752 } 753 } 754 755 void 756 config(signo) 757 int signo; 758 { 759 struct servtab *sep, *cp, **sepp; 760 long omask; 761 int n; 762 763 if (!setconfig()) { 764 syslog(LOG_ERR, "%s: %m", CONFIG); 765 return; 766 } 767 for (sep = servtab; sep; sep = sep->se_next) 768 sep->se_checked = 0; 769 while ((cp = getconfigent())) { 770 for (sep = servtab; sep; sep = sep->se_next) 771 if (strcmp(sep->se_service, cp->se_service) == 0 && 772 strcmp(sep->se_hostaddr, cp->se_hostaddr) == 0 && 773 strcmp(sep->se_proto, cp->se_proto) == 0 && 774 ISMUX(sep) == ISMUX(cp)) 775 break; 776 if (sep != 0) { 777 int i; 778 779 #define SWAP(type, a, b) {type c=(type)a; (type)a=(type)b; (type)b=(type)c;} 780 781 omask = sigblock(SIGBLOCK); 782 /* 783 * sep->se_wait may be holding the pid of a daemon 784 * that we're waiting for. If so, don't overwrite 785 * it unless the config file explicitly says don't 786 * wait. 787 */ 788 if (cp->se_bi == 0 && 789 (sep->se_wait == 1 || cp->se_wait == 0)) 790 sep->se_wait = cp->se_wait; 791 SWAP(char *, sep->se_user, cp->se_user); 792 SWAP(char *, sep->se_group, cp->se_group); 793 SWAP(char *, sep->se_server, cp->se_server); 794 for (i = 0; i < MAXARGV; i++) 795 SWAP(char *, sep->se_argv[i], cp->se_argv[i]); 796 SWAP(int, cp->se_type, sep->se_type); 797 SWAP(int, cp->se_max, sep->se_max); 798 #undef SWAP 799 if (isrpcservice(sep)) 800 unregister_rpc(sep); 801 sep->se_rpcversl = cp->se_rpcversl; 802 sep->se_rpcversh = cp->se_rpcversh; 803 sigsetmask(omask); 804 freeconfig(cp); 805 if (debug) 806 print_service("REDO", sep); 807 } else { 808 sep = enter(cp); 809 if (debug) 810 print_service("ADD ", sep); 811 } 812 sep->se_checked = 1; 813 814 switch (sep->se_family) { 815 case AF_UNIX: 816 if (sep->se_fd != -1) 817 break; 818 n = strlen(sep->se_service); 819 if (n > sizeof(sep->se_ctrladdr_un.sun_path)) { 820 syslog(LOG_ERR, "%s: address too long", 821 sep->se_service); 822 sep->se_checked = 0; 823 continue; 824 } 825 (void)unlink(sep->se_service); 826 strncpy(sep->se_ctrladdr_un.sun_path, 827 sep->se_service, n); 828 sep->se_ctrladdr_un.sun_family = AF_UNIX; 829 sep->se_ctrladdr_size = n + 830 sizeof(sep->se_ctrladdr_un) - 831 sizeof(sep->se_ctrladdr_un.sun_path); 832 if (!ISMUX(sep)) 833 setup(sep); 834 break; 835 case AF_INET: 836 sep->se_ctrladdr_in.sin_family = AF_INET; 837 if (!strcmp(sep->se_hostaddr,"*")) 838 sep->se_ctrladdr_in.sin_addr.s_addr = 839 INADDR_ANY; 840 else if (!inet_aton(sep->se_hostaddr, 841 &sep->se_ctrladdr_in.sin_addr)) { 842 /* Do we really want to support hostname lookups here? */ 843 struct hostent *hp; 844 hp = gethostbyname(sep->se_hostaddr); 845 if (hp == 0) { 846 syslog(LOG_ERR, "%s: unknown host", 847 sep->se_hostaddr); 848 sep->se_checked = 0; 849 continue; 850 } else if (hp->h_addrtype != AF_INET) { 851 syslog(LOG_ERR, 852 "%s: address isn't an Internet address", 853 sep->se_hostaddr); 854 sep->se_checked = 0; 855 continue; 856 } else if (hp->h_length != sizeof(struct in_addr)) { 857 syslog(LOG_ERR, 858 "%s: address size wrong (under DNS corruption attack?)", 859 sep->se_hostaddr); 860 sep->se_checked = 0; 861 continue; 862 } else { 863 memcpy(&sep->se_ctrladdr_in.sin_addr, 864 hp->h_addr_list[0], 865 sizeof(struct in_addr)); 866 } 867 } 868 if (ISMUX(sep)) { 869 sep->se_fd = -1; 870 continue; 871 } 872 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr_in); 873 if (isrpcservice(sep)) { 874 struct rpcent *rp; 875 876 sep->se_rpcprog = atoi(sep->se_service); 877 if (sep->se_rpcprog == 0) { 878 rp = getrpcbyname(sep->se_service); 879 if (rp == 0) { 880 syslog(LOG_ERR, 881 "%s/%s: unknown service", 882 sep->se_service, 883 sep->se_proto); 884 sep->se_checked = 0; 885 continue; 886 } 887 sep->se_rpcprog = rp->r_number; 888 } 889 if (sep->se_fd == -1 && !ISMUX(sep)) 890 setup(sep); 891 if (sep->se_fd != -1) 892 register_rpc(sep); 893 } else { 894 u_short port = htons(atoi(sep->se_service)); 895 896 if (!port) { 897 sp = getservbyname(sep->se_service, 898 sep->se_proto); 899 if (sp == 0) { 900 syslog(LOG_ERR, 901 "%s/%s: unknown service", 902 sep->se_service, 903 sep->se_proto); 904 sep->se_checked = 0; 905 continue; 906 } 907 port = sp->s_port; 908 } 909 if (port != sep->se_ctrladdr_in.sin_port) { 910 sep->se_ctrladdr_in.sin_port = port; 911 if (sep->se_fd >= 0) 912 close_sep(sep); 913 } 914 if (sep->se_fd == -1 && !ISMUX(sep)) 915 setup(sep); 916 } 917 } 918 } 919 endconfig(); 920 /* 921 * Purge anything not looked at above. 922 */ 923 omask = sigblock(SIGBLOCK); 924 sepp = &servtab; 925 while ((sep = *sepp)) { 926 if (sep->se_checked) { 927 sepp = &sep->se_next; 928 continue; 929 } 930 *sepp = sep->se_next; 931 if (sep->se_fd >= 0) 932 close_sep(sep); 933 if (isrpcservice(sep)) 934 unregister_rpc(sep); 935 if (sep->se_family == AF_UNIX) 936 (void)unlink(sep->se_service); 937 if (debug) 938 print_service("FREE", sep); 939 freeconfig(sep); 940 free((char *)sep); 941 } 942 (void) sigsetmask(omask); 943 } 944 945 void 946 retry(signo) 947 int signo; 948 { 949 struct servtab *sep; 950 951 timingout = 0; 952 for (sep = servtab; sep; sep = sep->se_next) { 953 if (sep->se_fd == -1 && !ISMUX(sep)) { 954 switch (sep->se_family) { 955 case AF_UNIX: 956 case AF_INET: 957 setup(sep); 958 if (sep->se_fd != -1 && isrpcservice(sep)) 959 register_rpc(sep); 960 break; 961 } 962 } 963 } 964 } 965 966 void 967 goaway(signo) 968 int signo; 969 { 970 struct servtab *sep; 971 972 for (sep = servtab; sep; sep = sep->se_next) { 973 if (sep->se_fd == -1) 974 continue; 975 976 switch (sep->se_family) { 977 case AF_UNIX: 978 (void)unlink(sep->se_service); 979 break; 980 case AF_INET: 981 if (sep->se_wait == 1 && isrpcservice(sep)) 982 unregister_rpc(sep); 983 break; 984 } 985 (void)close(sep->se_fd); 986 } 987 (void)unlink(_PATH_INETDPID); 988 exit(0); 989 } 990 991 void 992 setup(sep) 993 struct servtab *sep; 994 { 995 int on = 1; 996 997 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) { 998 if (debug) 999 fprintf(stderr, "socket failed on %s/%s: %s\n", 1000 sep->se_service, sep->se_proto, strerror(errno)); 1001 syslog(LOG_ERR, "%s/%s: socket: %m", 1002 sep->se_service, sep->se_proto); 1003 return; 1004 } 1005 /* Set all listening sockets to close-on-exec. */ 1006 if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) 1007 syslog(LOG_ERR, "fcntl (F_SETFD, FD_CLOEXEC): %m"); 1008 1009 #define turnon(fd, opt) \ 1010 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 1011 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 1012 turnon(sep->se_fd, SO_DEBUG) < 0) 1013 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 1014 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 1015 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 1016 #undef turnon 1017 1018 /* Set the socket buffer sizes, if specified. */ 1019 if (sep->se_sndbuf != 0 && setsockopt(sep->se_fd, SOL_SOCKET, 1020 SO_SNDBUF, (char *)&sep->se_sndbuf, sizeof(sep->se_sndbuf)) < 0) 1021 syslog(LOG_ERR, "setsockopt (SO_SNDBUF %d): %m", 1022 sep->se_sndbuf); 1023 if (sep->se_rcvbuf != 0 && setsockopt(sep->se_fd, SOL_SOCKET, 1024 SO_RCVBUF, (char *)&sep->se_rcvbuf, sizeof(sep->se_rcvbuf)) < 0) 1025 syslog(LOG_ERR, "setsockopt (SO_RCVBUF %d): %m", 1026 sep->se_rcvbuf); 1027 1028 if (bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size) < 0) { 1029 if (debug) 1030 fprintf(stderr, "bind failed on %s/%s: %s\n", 1031 sep->se_service, sep->se_proto, strerror(errno)); 1032 syslog(LOG_ERR, "%s/%s: bind: %m", 1033 sep->se_service, sep->se_proto); 1034 (void) close(sep->se_fd); 1035 sep->se_fd = -1; 1036 if (!timingout) { 1037 timingout = 1; 1038 alarm(RETRYTIME); 1039 } 1040 return; 1041 } 1042 if (sep->se_socktype == SOCK_STREAM) 1043 listen(sep->se_fd, 10); 1044 1045 FD_SET(sep->se_fd, &allsock); 1046 nsock++; 1047 if (sep->se_fd > maxsock) { 1048 maxsock = sep->se_fd; 1049 if (maxsock > rlim_ofile_cur - FD_MARGIN) 1050 bump_nofile(); 1051 } 1052 if (debug) 1053 fprintf(stderr, "registered %s on %d\n", 1054 sep->se_server, sep->se_fd); 1055 } 1056 1057 /* 1058 * Finish with a service and its socket. 1059 */ 1060 void 1061 close_sep(sep) 1062 struct servtab *sep; 1063 { 1064 if (sep->se_fd >= 0) { 1065 nsock--; 1066 FD_CLR(sep->se_fd, &allsock); 1067 (void) close(sep->se_fd); 1068 sep->se_fd = -1; 1069 } 1070 sep->se_count = 0; 1071 /* 1072 * Don't keep the pid of this running deamon: when reapchild() 1073 * reaps this pid, it would erroneously increment nsock. 1074 */ 1075 if (sep->se_wait > 1) 1076 sep->se_wait = 1; 1077 } 1078 1079 void 1080 register_rpc(sep) 1081 struct servtab *sep; 1082 { 1083 #ifdef RPC 1084 int n; 1085 struct sockaddr_in sin; 1086 struct protoent *pp; 1087 1088 if ((pp = getprotobyname(sep->se_proto+4)) == NULL) { 1089 syslog(LOG_ERR, "%s: getproto: %m", 1090 sep->se_proto); 1091 return; 1092 } 1093 n = sizeof sin; 1094 if (getsockname(sep->se_fd, (struct sockaddr *)&sin, &n) < 0) { 1095 syslog(LOG_ERR, "%s/%s: getsockname: %m", 1096 sep->se_service, sep->se_proto); 1097 return; 1098 } 1099 1100 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1101 if (debug) 1102 fprintf(stderr, "pmap_set: %u %u %u %u\n", 1103 sep->se_rpcprog, n, pp->p_proto, 1104 ntohs(sin.sin_port)); 1105 (void)pmap_unset(sep->se_rpcprog, n); 1106 if (!pmap_set(sep->se_rpcprog, n, pp->p_proto, ntohs(sin.sin_port))) 1107 syslog(LOG_ERR, "pmap_set: %u %u %u %u: %m", 1108 sep->se_rpcprog, n, pp->p_proto, 1109 ntohs(sin.sin_port)); 1110 } 1111 #endif /* RPC */ 1112 } 1113 1114 void 1115 unregister_rpc(sep) 1116 struct servtab *sep; 1117 { 1118 #ifdef RPC 1119 int n; 1120 1121 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1122 if (debug) 1123 fprintf(stderr, "pmap_unset(%u, %u)\n", 1124 sep->se_rpcprog, n); 1125 if (!pmap_unset(sep->se_rpcprog, n)) 1126 syslog(LOG_ERR, "pmap_unset(%u, %u)\n", 1127 sep->se_rpcprog, n); 1128 } 1129 #endif /* RPC */ 1130 } 1131 1132 1133 struct servtab * 1134 enter(cp) 1135 struct servtab *cp; 1136 { 1137 struct servtab *sep; 1138 long omask; 1139 1140 sep = (struct servtab *)malloc(sizeof (*sep)); 1141 if (sep == (struct servtab *)0) { 1142 syslog(LOG_ERR, "Out of memory."); 1143 exit(-1); 1144 } 1145 *sep = *cp; 1146 sep->se_fd = -1; 1147 sep->se_rpcprog = -1; 1148 omask = sigblock(SIGBLOCK); 1149 sep->se_next = servtab; 1150 servtab = sep; 1151 sigsetmask(omask); 1152 return (sep); 1153 } 1154 1155 FILE *fconfig = NULL; 1156 struct servtab serv; 1157 char line[LINE_MAX]; 1158 char *defhost; 1159 1160 int 1161 setconfig() 1162 { 1163 if (defhost) free(defhost); 1164 defhost = newstr("*"); 1165 if (fconfig != NULL) { 1166 fseek(fconfig, 0L, SEEK_SET); 1167 return (1); 1168 } 1169 fconfig = fopen(CONFIG, "r"); 1170 return (fconfig != NULL); 1171 } 1172 1173 void 1174 endconfig() 1175 { 1176 if (fconfig) { 1177 (void) fclose(fconfig); 1178 fconfig = NULL; 1179 } 1180 if (defhost) { 1181 free(defhost); 1182 defhost = 0; 1183 } 1184 } 1185 1186 struct servtab * 1187 getconfigent() 1188 { 1189 struct servtab *sep = &serv; 1190 int argc, val; 1191 char *cp, *cp0, *arg, *buf0, *buf1, *sz0, *sz1; 1192 static char TCPMUX_TOKEN[] = "tcpmux/"; 1193 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) 1194 char *hostdelim; 1195 1196 more: 1197 #ifdef MULOG 1198 while ((cp = nextline(fconfig)) && (*cp == '#' || *cp == '\0')) { 1199 /* Avoid use of `skip' if there is a danger of it looking 1200 * at continuation lines. 1201 */ 1202 do { 1203 cp++; 1204 } while (*cp == ' ' || *cp == '\t'); 1205 if (*cp == '\0') 1206 continue; 1207 if ((arg = skip(&cp)) == NULL) 1208 continue; 1209 if (strcmp(arg, "DOMAIN")) 1210 continue; 1211 if (curdom) 1212 free(curdom); 1213 curdom = NULL; 1214 while (*cp == ' ' || *cp == '\t') 1215 cp++; 1216 if (*cp == '\0') 1217 continue; 1218 arg = cp; 1219 while (*cp && *cp != ' ' && *cp != '\t') 1220 cp++; 1221 if (*cp != '\0') 1222 *cp++ = '\0'; 1223 curdom = newstr(arg); 1224 } 1225 #else 1226 while ((cp = nextline(fconfig)) && (*cp == '#' || *cp == '\0')) 1227 ; 1228 #endif 1229 if (cp == NULL) 1230 return ((struct servtab *)0); 1231 /* 1232 * clear the static buffer, since some fields (se_ctrladdr, 1233 * for example) don't get initialized here. 1234 */ 1235 memset((caddr_t)sep, 0, sizeof *sep); 1236 arg = skip(&cp); 1237 if (cp == NULL) { 1238 /* got an empty line containing just blanks/tabs. */ 1239 goto more; 1240 } 1241 /* Check for a host name. */ 1242 hostdelim = strrchr(arg, ':'); 1243 if (hostdelim) { 1244 *hostdelim = '\0'; 1245 sep->se_hostaddr = newstr(arg); 1246 arg = hostdelim + 1; 1247 /* 1248 * If the line is of the form `host:', then just change the 1249 * default host for the following lines. 1250 */ 1251 if (*arg == '\0') { 1252 arg = skip(&cp); 1253 if (cp == NULL) { 1254 free(defhost); 1255 defhost = sep->se_hostaddr; 1256 goto more; 1257 } 1258 } 1259 } else 1260 sep->se_hostaddr = newstr(defhost); 1261 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1262 char *c = arg + MUX_LEN; 1263 if (*c == '+') { 1264 sep->se_type = MUXPLUS_TYPE; 1265 c++; 1266 } else 1267 sep->se_type = MUX_TYPE; 1268 sep->se_service = newstr(c); 1269 } else { 1270 sep->se_service = newstr(arg); 1271 sep->se_type = NORM_TYPE; 1272 } 1273 1274 arg = sskip(&cp); 1275 if (strcmp(arg, "stream") == 0) 1276 sep->se_socktype = SOCK_STREAM; 1277 else if (strcmp(arg, "dgram") == 0) 1278 sep->se_socktype = SOCK_DGRAM; 1279 else if (strcmp(arg, "rdm") == 0) 1280 sep->se_socktype = SOCK_RDM; 1281 else if (strcmp(arg, "seqpacket") == 0) 1282 sep->se_socktype = SOCK_SEQPACKET; 1283 else if (strcmp(arg, "raw") == 0) 1284 sep->se_socktype = SOCK_RAW; 1285 else 1286 sep->se_socktype = -1; 1287 1288 sep->se_proto = newstr(sskip(&cp)); 1289 1290 #define MALFORMED(arg) \ 1291 do { \ 1292 syslog(LOG_ERR, "%s: malformed buffer size option `%s'", \ 1293 sep->se_service, (arg)); \ 1294 goto more; \ 1295 } while (0) 1296 1297 #define GETVAL(arg) \ 1298 do { \ 1299 if (!isdigit(*(arg))) \ 1300 MALFORMED(arg); \ 1301 val = strtol((arg), &cp0, 10); \ 1302 if (cp0 != NULL) { \ 1303 if (cp0[1] != '\0') \ 1304 MALFORMED((arg)); \ 1305 if (cp0[0] == 'k') \ 1306 val *= 1024; \ 1307 if (cp0[0] == 'm') \ 1308 val *= 1024 * 1024; \ 1309 } \ 1310 if (val < 1) { \ 1311 syslog(LOG_ERR, "%s: invalid buffer size `%s'", \ 1312 sep->se_service, (arg)); \ 1313 goto more; \ 1314 } \ 1315 } while (0) 1316 1317 #define ASSIGN(arg) \ 1318 do { \ 1319 if (strcmp((arg), "sndbuf") == 0) \ 1320 sep->se_sndbuf = val; \ 1321 else if (strcmp((arg), "rcvbuf") == 0) \ 1322 sep->se_rcvbuf = val; \ 1323 else \ 1324 MALFORMED((arg)); \ 1325 } while (0) 1326 1327 /* 1328 * Extract the send and receive buffer sizes before parsing 1329 * the protocol. 1330 */ 1331 sep->se_sndbuf = sep->se_rcvbuf = 0; 1332 buf0 = buf1 = sz0 = sz1 = NULL; 1333 if ((buf0 = strchr(sep->se_proto, ',')) != NULL) { 1334 /* Not meaningful for Tcpmux services. */ 1335 if (sep->se_type != NORM_TYPE) { 1336 syslog(LOG_ERR, "%s: can't specify buffer sizes for " 1337 "tcpmux services", sep->se_service); 1338 goto more; 1339 } 1340 1341 /* Skip the , */ 1342 *buf0++ = '\0'; 1343 1344 /* Check to see if another socket buffer size was specified. */ 1345 if ((buf1 = strchr(buf0, ',')) != NULL) { 1346 /* Skip the , */ 1347 *buf1++ = '\0'; 1348 1349 /* Make sure a 3rd one wasn't specified. */ 1350 if (strchr(buf1, ',') != NULL) { 1351 syslog(LOG_ERR, "%s: too many buffer sizes", 1352 sep->se_service); 1353 goto more; 1354 } 1355 1356 /* Locate the size. */ 1357 if ((sz1 = strchr(buf1, '=')) == NULL) 1358 MALFORMED(buf1); 1359 1360 /* Skip the = */ 1361 *sz1++ = '\0'; 1362 } 1363 1364 /* Locate the size. */ 1365 if ((sz0 = strchr(buf0, '=')) == NULL) 1366 MALFORMED(buf0); 1367 1368 /* Skip the = */ 1369 *sz0++ = '\0'; 1370 1371 GETVAL(sz0); 1372 ASSIGN(buf0); 1373 1374 if (buf1 != NULL) { 1375 GETVAL(sz1); 1376 ASSIGN(buf1); 1377 } 1378 } 1379 1380 #undef ASSIGN 1381 #undef GETVAL 1382 #undef MALFORMED 1383 1384 if (strcmp(sep->se_proto, "unix") == 0) { 1385 sep->se_family = AF_UNIX; 1386 } else { 1387 sep->se_family = AF_INET; 1388 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1389 #ifdef RPC 1390 char *cp, *ccp; 1391 cp = strchr(sep->se_service, '/'); 1392 if (cp == 0) { 1393 syslog(LOG_ERR, "%s: no rpc version", 1394 sep->se_service); 1395 goto more; 1396 } 1397 *cp++ = '\0'; 1398 sep->se_rpcversl = sep->se_rpcversh = 1399 strtol(cp, &ccp, 0); 1400 if (ccp == cp) { 1401 badafterall: 1402 syslog(LOG_ERR, "%s/%s: bad rpc version", 1403 sep->se_service, cp); 1404 goto more; 1405 } 1406 if (*ccp == '-') { 1407 cp = ccp + 1; 1408 sep->se_rpcversh = strtol(cp, &ccp, 0); 1409 if (ccp == cp) 1410 goto badafterall; 1411 } 1412 #else 1413 syslog(LOG_ERR, "%s: rpc services not suported", 1414 sep->se_service); 1415 goto more; 1416 #endif /* RPC */ 1417 } 1418 } 1419 arg = sskip(&cp); 1420 { 1421 char *cp; 1422 cp = strchr(arg, '.'); 1423 if (cp) { 1424 *cp++ = '\0'; 1425 sep->se_max = atoi(cp); 1426 } else 1427 sep->se_max = TOOMANY; 1428 } 1429 sep->se_wait = strcmp(arg, "wait") == 0; 1430 if (ISMUX(sep)) { 1431 /* 1432 * Silently enforce "nowait" for TCPMUX services since 1433 * they don't have an assigned port to listen on. 1434 */ 1435 sep->se_wait = 0; 1436 1437 if (strcmp(sep->se_proto, "tcp")) { 1438 syslog(LOG_ERR, 1439 "%s: bad protocol for tcpmux service %s", 1440 CONFIG, sep->se_service); 1441 goto more; 1442 } 1443 if (sep->se_socktype != SOCK_STREAM) { 1444 syslog(LOG_ERR, 1445 "%s: bad socket type for tcpmux service %s", 1446 CONFIG, sep->se_service); 1447 goto more; 1448 } 1449 } 1450 sep->se_user = newstr(sskip(&cp)); 1451 if ((sep->se_group = strchr(sep->se_user, '.'))) 1452 *sep->se_group++ = '\0'; 1453 sep->se_server = newstr(sskip(&cp)); 1454 if (strcmp(sep->se_server, "internal") == 0) { 1455 struct biltin *bi; 1456 1457 for (bi = biltins; bi->bi_service; bi++) 1458 if (bi->bi_socktype == sep->se_socktype && 1459 strcmp(bi->bi_service, sep->se_service) == 0) 1460 break; 1461 if (bi->bi_service == 0) { 1462 syslog(LOG_ERR, "internal service %s unknown", 1463 sep->se_service); 1464 goto more; 1465 } 1466 sep->se_bi = bi; 1467 sep->se_wait = bi->bi_wait; 1468 } else 1469 sep->se_bi = NULL; 1470 argc = 0; 1471 for (arg = skip(&cp); cp; arg = skip(&cp)) { 1472 #if MULOG 1473 char *colon; 1474 1475 if (argc == 0 && (colon = strrchr(arg, ':'))) { 1476 while (arg < colon) { 1477 int x; 1478 char *ccp; 1479 1480 switch (*arg++) { 1481 case 'l': 1482 x = 1; 1483 if (isdigit(*arg)) { 1484 x = strtol(arg, &ccp, 0); 1485 if (ccp == arg) 1486 break; 1487 arg = ccp; 1488 } 1489 sep->se_log &= ~MULOG_RFC931; 1490 sep->se_log |= x; 1491 break; 1492 case 'a': 1493 sep->se_log |= MULOG_RFC931; 1494 break; 1495 default: 1496 break; 1497 } 1498 } 1499 arg = colon + 1; 1500 } 1501 #endif 1502 if (argc < MAXARGV) 1503 sep->se_argv[argc++] = newstr(arg); 1504 } 1505 while (argc <= MAXARGV) 1506 sep->se_argv[argc++] = NULL; 1507 return (sep); 1508 } 1509 1510 void 1511 freeconfig(cp) 1512 struct servtab *cp; 1513 { 1514 int i; 1515 1516 if (cp->se_hostaddr) 1517 free(cp->se_hostaddr); 1518 if (cp->se_service) 1519 free(cp->se_service); 1520 if (cp->se_proto) 1521 free(cp->se_proto); 1522 if (cp->se_user) 1523 free(cp->se_user); 1524 /* Note: se_group is part of the newstr'ed se_user */ 1525 if (cp->se_server) 1526 free(cp->se_server); 1527 for (i = 0; i < MAXARGV; i++) 1528 if (cp->se_argv[i]) 1529 free(cp->se_argv[i]); 1530 } 1531 1532 1533 /* 1534 * Safe skip - if skip returns null, log a syntax error in the 1535 * configuration file and exit. 1536 */ 1537 char * 1538 sskip(cpp) 1539 char **cpp; 1540 { 1541 char *cp; 1542 1543 cp = skip(cpp); 1544 if (cp == NULL) { 1545 syslog(LOG_ERR, "%s: syntax error", CONFIG); 1546 exit(-1); 1547 } 1548 return (cp); 1549 } 1550 1551 char * 1552 skip(cpp) 1553 char **cpp; 1554 { 1555 char *cp = *cpp; 1556 char *start; 1557 1558 if (*cpp == NULL) 1559 return ((char *)0); 1560 1561 again: 1562 while (*cp == ' ' || *cp == '\t') 1563 cp++; 1564 if (*cp == '\0') { 1565 int c; 1566 1567 c = getc(fconfig); 1568 (void) ungetc(c, fconfig); 1569 if (c == ' ' || c == '\t') 1570 if ((cp = nextline(fconfig))) 1571 goto again; 1572 *cpp = (char *)0; 1573 return ((char *)0); 1574 } 1575 start = cp; 1576 while (*cp && *cp != ' ' && *cp != '\t') 1577 cp++; 1578 if (*cp != '\0') 1579 *cp++ = '\0'; 1580 *cpp = cp; 1581 return (start); 1582 } 1583 1584 char * 1585 nextline(fd) 1586 FILE *fd; 1587 { 1588 char *cp; 1589 1590 if (fgets(line, sizeof (line), fd) == NULL) 1591 return ((char *)0); 1592 cp = strchr(line, '\n'); 1593 if (cp) 1594 *cp = '\0'; 1595 return (line); 1596 } 1597 1598 char * 1599 newstr(cp) 1600 char *cp; 1601 { 1602 if ((cp = strdup(cp ? cp : ""))) 1603 return (cp); 1604 syslog(LOG_ERR, "strdup: %m"); 1605 exit(-1); 1606 } 1607 1608 void 1609 inetd_setproctitle(a, s) 1610 char *a; 1611 int s; 1612 { 1613 int size; 1614 char *cp; 1615 struct sockaddr_in sin; 1616 char buf[80]; 1617 1618 cp = Argv[0]; 1619 size = sizeof(sin); 1620 if (getpeername(s, (struct sockaddr *)&sin, &size) == 0) 1621 (void)snprintf(buf, sizeof buf, "-%s [%s]", a, 1622 inet_ntoa(sin.sin_addr)); 1623 else 1624 (void)snprintf(buf, sizeof buf, "-%s", a); 1625 strncpy(cp, buf, LastArg - cp); 1626 cp += strlen(cp); 1627 while (cp < LastArg) 1628 *cp++ = ' '; 1629 } 1630 1631 void 1632 logpid() 1633 { 1634 FILE *fp; 1635 1636 if ((fp = fopen(_PATH_INETDPID, "w")) != NULL) { 1637 fprintf(fp, "%u\n", getpid()); 1638 (void)fclose(fp); 1639 } 1640 } 1641 1642 void 1643 bump_nofile() 1644 { 1645 #ifdef RLIMIT_NOFILE 1646 1647 #define FD_CHUNK 32 1648 1649 struct rlimit rl; 1650 1651 if (getrlimit(RLIMIT_NOFILE, &rl) < 0) { 1652 syslog(LOG_ERR, "getrlimit: %m"); 1653 return; 1654 } 1655 rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK); 1656 if (rl.rlim_cur <= rlim_ofile_cur) { 1657 syslog(LOG_ERR, 1658 "bump_nofile: cannot extend file limit, max = %d", 1659 (int)rl.rlim_cur); 1660 return; 1661 } 1662 1663 if (setrlimit(RLIMIT_NOFILE, &rl) < 0) { 1664 syslog(LOG_ERR, "setrlimit: %m"); 1665 return; 1666 } 1667 1668 rlim_ofile_cur = rl.rlim_cur; 1669 return; 1670 1671 #else 1672 syslog(LOG_ERR, "bump_nofile: cannot extend file limit"); 1673 return; 1674 #endif 1675 } 1676 1677 /* 1678 * Internet services provided internally by inetd: 1679 */ 1680 #define BUFSIZE 4096 1681 1682 /* ARGSUSED */ 1683 void 1684 echo_stream(s, sep) /* Echo service -- echo data back */ 1685 int s; 1686 struct servtab *sep; 1687 { 1688 char buffer[BUFSIZE]; 1689 int i; 1690 1691 inetd_setproctitle(sep->se_service, s); 1692 while ((i = read(s, buffer, sizeof(buffer))) > 0 && 1693 write(s, buffer, i) > 0) 1694 ; 1695 } 1696 1697 /* ARGSUSED */ 1698 void 1699 echo_dg(s, sep) /* Echo service -- echo data back */ 1700 int s; 1701 struct servtab *sep; 1702 { 1703 char buffer[BUFSIZE]; 1704 int i, size; 1705 struct sockaddr sa; 1706 1707 size = sizeof(sa); 1708 if ((i = recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size)) < 0) 1709 return; 1710 (void) sendto(s, buffer, i, 0, &sa, sizeof(sa)); 1711 } 1712 1713 /* ARGSUSED */ 1714 void 1715 discard_stream(s, sep) /* Discard service -- ignore data */ 1716 int s; 1717 struct servtab *sep; 1718 { 1719 char buffer[BUFSIZE]; 1720 1721 inetd_setproctitle(sep->se_service, s); 1722 while ((errno = 0, read(s, buffer, sizeof(buffer)) > 0) || 1723 errno == EINTR) 1724 ; 1725 } 1726 1727 /* ARGSUSED */ 1728 void 1729 discard_dg(s, sep) /* Discard service -- ignore data */ 1730 int s; 1731 struct servtab *sep; 1732 { 1733 char buffer[BUFSIZE]; 1734 1735 (void) read(s, buffer, sizeof(buffer)); 1736 } 1737 1738 #include <ctype.h> 1739 #define LINESIZ 72 1740 char ring[128]; 1741 char *endring; 1742 1743 void 1744 initring() 1745 { 1746 int i; 1747 1748 endring = ring; 1749 1750 for (i = 0; i <= 128; ++i) 1751 if (isprint(i)) 1752 *endring++ = i; 1753 } 1754 1755 /* ARGSUSED */ 1756 void 1757 chargen_stream(s, sep) /* Character generator */ 1758 int s; 1759 struct servtab *sep; 1760 { 1761 int len; 1762 char *rs, text[LINESIZ+2]; 1763 1764 inetd_setproctitle(sep->se_service, s); 1765 1766 if (!endring) { 1767 initring(); 1768 rs = ring; 1769 } 1770 1771 text[LINESIZ] = '\r'; 1772 text[LINESIZ + 1] = '\n'; 1773 for (rs = ring;;) { 1774 if ((len = endring - rs) >= LINESIZ) 1775 memmove(text, rs, LINESIZ); 1776 else { 1777 memmove(text, rs, len); 1778 memmove(text + len, ring, LINESIZ - len); 1779 } 1780 if (++rs == endring) 1781 rs = ring; 1782 if (write(s, text, sizeof(text)) != sizeof(text)) 1783 break; 1784 } 1785 } 1786 1787 /* ARGSUSED */ 1788 void 1789 chargen_dg(s, sep) /* Character generator */ 1790 int s; 1791 struct servtab *sep; 1792 { 1793 struct sockaddr sa; 1794 static char *rs; 1795 int len, size; 1796 char text[LINESIZ+2]; 1797 1798 if (endring == 0) { 1799 initring(); 1800 rs = ring; 1801 } 1802 1803 size = sizeof(sa); 1804 if (recvfrom(s, text, sizeof(text), 0, &sa, &size) < 0) 1805 return; 1806 1807 if ((len = endring - rs) >= LINESIZ) 1808 memmove(text, rs, LINESIZ); 1809 else { 1810 memmove(text, rs, len); 1811 memmove(text + len, ring, LINESIZ - len); 1812 } 1813 if (++rs == endring) 1814 rs = ring; 1815 text[LINESIZ] = '\r'; 1816 text[LINESIZ + 1] = '\n'; 1817 (void) sendto(s, text, sizeof(text), 0, &sa, sizeof(sa)); 1818 } 1819 1820 /* 1821 * Return a machine readable date and time, in the form of the 1822 * number of seconds since midnight, Jan 1, 1900. Since gettimeofday 1823 * returns the number of seconds since midnight, Jan 1, 1970, 1824 * we must add 2208988800 seconds to this figure to make up for 1825 * some seventy years Bell Labs was asleep. 1826 */ 1827 1828 long 1829 machtime() 1830 { 1831 struct timeval tv; 1832 1833 if (gettimeofday(&tv, (struct timezone *)0) < 0) { 1834 if (debug) 1835 fprintf(stderr, "Unable to get time of day\n"); 1836 return (0L); 1837 } 1838 #define OFFSET ((u_long)25567 * 24*60*60) 1839 return (htonl((long)(tv.tv_sec + OFFSET))); 1840 #undef OFFSET 1841 } 1842 1843 /* ARGSUSED */ 1844 void 1845 machtime_stream(s, sep) 1846 int s; 1847 struct servtab *sep; 1848 { 1849 long result; 1850 1851 result = machtime(); 1852 (void) write(s, (char *) &result, sizeof(result)); 1853 } 1854 1855 /* ARGSUSED */ 1856 void 1857 machtime_dg(s, sep) 1858 int s; 1859 struct servtab *sep; 1860 { 1861 long result; 1862 struct sockaddr sa; 1863 int size; 1864 1865 size = sizeof(sa); 1866 if (recvfrom(s, (char *)&result, sizeof(result), 0, &sa, &size) < 0) 1867 return; 1868 result = machtime(); 1869 (void) sendto(s, (char *) &result, sizeof(result), 0, &sa, sizeof(sa)); 1870 } 1871 1872 /* ARGSUSED */ 1873 void 1874 daytime_stream(s, sep) /* Return human-readable time of day */ 1875 int s; 1876 struct servtab *sep; 1877 { 1878 char buffer[256]; 1879 time_t clock; 1880 int len; 1881 1882 clock = time((time_t *) 0); 1883 1884 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 1885 (void) write(s, buffer, len); 1886 } 1887 1888 /* ARGSUSED */ 1889 void 1890 daytime_dg(s, sep) /* Return human-readable time of day */ 1891 int s; 1892 struct servtab *sep; 1893 { 1894 char buffer[256]; 1895 time_t clock; 1896 struct sockaddr sa; 1897 int size, len; 1898 1899 clock = time((time_t *) 0); 1900 1901 size = sizeof(sa); 1902 if (recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size) < 0) 1903 return; 1904 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 1905 (void) sendto(s, buffer, len, 0, &sa, sizeof(sa)); 1906 } 1907 1908 /* 1909 * print_service: 1910 * Dump relevant information to stderr 1911 */ 1912 void 1913 print_service(action, sep) 1914 char *action; 1915 struct servtab *sep; 1916 { 1917 if (isrpcservice(sep)) 1918 fprintf(stderr, 1919 "%s: %s rpcprog=%d, rpcvers = %d/%d, proto=%s, wait.max=%d.%d, user.group=%s.%s builtin=%lx server=%s\n", 1920 action, sep->se_service, 1921 sep->se_rpcprog, sep->se_rpcversh, sep->se_rpcversl, sep->se_proto, 1922 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 1923 (long)sep->se_bi, sep->se_server); 1924 else 1925 fprintf(stderr, 1926 "%s: %s proto=%s, wait.max=%d.%d, user.group=%s.%s builtin=%lx server=%s\n", 1927 action, sep->se_service, sep->se_proto, 1928 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 1929 (long)sep->se_bi, sep->se_server); 1930 } 1931 1932 void 1933 usage() 1934 { 1935 1936 #ifdef LIBWRAP 1937 (void)fprintf(stderr, "usage: %s [-dl] [conf]\n", __progname); 1938 #else 1939 (void)fprintf(stderr, "usage: %s [-d] [conf]\n", __progname); 1940 #endif 1941 exit(1); 1942 } 1943 1944 1945 /* 1946 * Based on TCPMUX.C by Mark K. Lottor November 1988 1947 * sri-nic::ps:<mkl>tcpmux.c 1948 */ 1949 1950 static int /* # of characters upto \r,\n or \0 */ 1951 getline(fd, buf, len) 1952 int fd; 1953 char *buf; 1954 int len; 1955 { 1956 int count = 0, n; 1957 1958 do { 1959 n = read(fd, buf, len-count); 1960 if (n == 0) 1961 return (count); 1962 if (n < 0) 1963 return (-1); 1964 while (--n >= 0) { 1965 if (*buf == '\r' || *buf == '\n' || *buf == '\0') 1966 return (count); 1967 count++; 1968 buf++; 1969 } 1970 } while (count < len); 1971 return (count); 1972 } 1973 1974 #define MAX_SERV_LEN (256+2) /* 2 bytes for \r\n */ 1975 1976 #define strwrite(fd, buf) (void) write(fd, buf, sizeof(buf)-1) 1977 1978 void 1979 tcpmux(ctrl, sep) 1980 int ctrl; 1981 struct servtab *sep; 1982 { 1983 char service[MAX_SERV_LEN+1]; 1984 int len; 1985 1986 /* Get requested service name */ 1987 if ((len = getline(ctrl, service, MAX_SERV_LEN)) < 0) { 1988 strwrite(ctrl, "-Error reading service name\r\n"); 1989 goto reject; 1990 } 1991 service[len] = '\0'; 1992 1993 if (debug) 1994 fprintf(stderr, "tcpmux: someone wants %s\n", service); 1995 1996 /* 1997 * Help is a required command, and lists available services, 1998 * one per line. 1999 */ 2000 if (!strcasecmp(service, "help")) { 2001 strwrite(ctrl, "+Available services:\r\n"); 2002 strwrite(ctrl, "help\r\n"); 2003 for (sep = servtab; sep; sep = sep->se_next) { 2004 if (!ISMUX(sep)) 2005 continue; 2006 (void)write(ctrl, sep->se_service, 2007 strlen(sep->se_service)); 2008 strwrite(ctrl, "\r\n"); 2009 } 2010 goto reject; 2011 } 2012 2013 /* Try matching a service in inetd.conf with the request */ 2014 for (sep = servtab; sep; sep = sep->se_next) { 2015 if (!ISMUX(sep)) 2016 continue; 2017 if (!strcasecmp(service, sep->se_service)) { 2018 if (ISMUXPLUS(sep)) 2019 strwrite(ctrl, "+Go\r\n"); 2020 run_service(ctrl, sep); 2021 return; 2022 } 2023 } 2024 strwrite(ctrl, "-Service not available\r\n"); 2025 reject: 2026 _exit(1); 2027 } 2028 2029 2030 #ifdef MULOG 2031 dolog(sep, ctrl) 2032 struct servtab *sep; 2033 int ctrl; 2034 { 2035 struct sockaddr sa; 2036 struct sockaddr_in *sin = (struct sockaddr_in *)&sa; 2037 int len = sizeof(sa); 2038 struct hostent *hp; 2039 char *host, *dp, buf[BUFSIZ], *rfc931_name(); 2040 int connected = 1; 2041 2042 if (sep->se_family != AF_INET) 2043 return; 2044 2045 if (getpeername(ctrl, &sa, &len) < 0) { 2046 if (errno != ENOTCONN) { 2047 syslog(LOG_ERR, "getpeername: %m"); 2048 return; 2049 } 2050 if (recvfrom(ctrl, buf, sizeof(buf), MSG_PEEK, &sa, &len) < 0) { 2051 syslog(LOG_ERR, "recvfrom: %m"); 2052 return; 2053 } 2054 connected = 0; 2055 } 2056 if (sa.sa_family != AF_INET) { 2057 syslog(LOG_ERR, "unexpected address family %u", sa.sa_family); 2058 return; 2059 } 2060 2061 hp = gethostbyaddr((char *) &sin->sin_addr.s_addr, 2062 sizeof (sin->sin_addr.s_addr), AF_INET); 2063 2064 host = hp?hp->h_name:inet_ntoa(sin->sin_addr); 2065 2066 switch (sep->se_log & ~MULOG_RFC931) { 2067 case 0: 2068 return; 2069 case 1: 2070 if (curdom == NULL || *curdom == '\0') 2071 break; 2072 dp = host + strlen(host) - strlen(curdom); 2073 if (dp < host) 2074 break; 2075 if (debug) 2076 fprintf(stderr, "check \"%s\" against curdom \"%s\"\n", 2077 host, curdom); 2078 if (strcasecmp(dp, curdom) == 0) 2079 return; 2080 break; 2081 case 2: 2082 default: 2083 break; 2084 } 2085 2086 openlog("", LOG_NOWAIT, MULOG); 2087 2088 if (connected && (sep->se_log & MULOG_RFC931)) 2089 syslog(LOG_INFO, "%s@%s wants %s", 2090 rfc931_name(sin, ctrl), host, sep->se_service); 2091 else 2092 syslog(LOG_INFO, "%s wants %s", 2093 host, sep->se_service); 2094 } 2095 2096 /* 2097 * From tcp_log by 2098 * Wietse Venema, Eindhoven University of Technology, The Netherlands. 2099 */ 2100 #if 0 2101 static char sccsid[] = "@(#) rfc931.c 1.3 92/08/31 22:54:46"; 2102 #endif 2103 2104 #include <setjmp.h> 2105 2106 #define RFC931_PORT 113 /* Semi-well-known port */ 2107 #define TIMEOUT 4 2108 #define TIMEOUT2 10 2109 2110 static jmp_buf timebuf; 2111 2112 /* timeout - handle timeouts */ 2113 2114 static void timeout(sig) 2115 int sig; 2116 { 2117 longjmp(timebuf, sig); 2118 } 2119 2120 /* rfc931_name - return remote user name */ 2121 2122 char * 2123 rfc931_name(there, ctrl) 2124 struct sockaddr_in *there; /* remote link information */ 2125 int ctrl; 2126 { 2127 struct sockaddr_in here; /* local link information */ 2128 struct sockaddr_in sin; /* for talking to RFC931 daemon */ 2129 int length; 2130 int s; 2131 unsigned remote; 2132 unsigned local; 2133 static char user[256]; /* XXX */ 2134 char buf[256]; 2135 char *cp; 2136 char *result = "USER_UNKNOWN"; 2137 int len; 2138 2139 /* Find out local port number of our stdin. */ 2140 2141 length = sizeof(here); 2142 if (getsockname(ctrl, (struct sockaddr *) &here, &length) == -1) { 2143 syslog(LOG_ERR, "getsockname: %m"); 2144 return (result); 2145 } 2146 /* Set up timer so we won't get stuck. */ 2147 2148 if ((s = socket(AF_INET, SOCK_STREAM, 0)) == -1) { 2149 syslog(LOG_ERR, "socket: %m"); 2150 return (result); 2151 } 2152 2153 sin = here; 2154 sin.sin_port = htons(0); 2155 if (bind(s, (struct sockaddr *) &sin, sizeof(sin)) == -1) { 2156 syslog(LOG_ERR, "bind: %m"); 2157 return (result); 2158 } 2159 2160 signal(SIGALRM, timeout); 2161 if (setjmp(timebuf)) { 2162 close(s); /* not: fclose(fp) */ 2163 return (result); 2164 } 2165 alarm(TIMEOUT); 2166 2167 /* Connect to the RFC931 daemon. */ 2168 2169 sin = *there; 2170 sin.sin_port = htons(RFC931_PORT); 2171 if (connect(s, (struct sockaddr *) &sin, sizeof(sin)) == -1) { 2172 close(s); 2173 alarm(0); 2174 return (result); 2175 } 2176 2177 /* Query the RFC 931 server. Would 13-byte writes ever be broken up? */ 2178 (void)snprintf(buf, sizeof buf, "%u,%u\r\n", ntohs(there->sin_port), 2179 ntohs(here.sin_port)); 2180 2181 2182 for (len = 0, cp = buf; len < strlen(buf); ) { 2183 int n; 2184 2185 if ((n = write(s, cp, strlen(buf) - len)) == -1) { 2186 close(s); 2187 alarm(0); 2188 return (result); 2189 } 2190 cp += n; 2191 len += n; 2192 } 2193 2194 /* Read response */ 2195 for (cp = buf; cp < buf + sizeof(buf) - 1; ) { 2196 char c; 2197 if (read(s, &c, 1) != 1) { 2198 close(s); 2199 alarm(0); 2200 return (result); 2201 } 2202 if (c == '\n') 2203 break; 2204 *cp++ = c; 2205 } 2206 *cp = '\0'; 2207 2208 if (sscanf(buf, "%u , %u : USERID :%*[^:]:%255s", &remote, &local, user) == 3 2209 && ntohs(there->sin_port) == remote 2210 && ntohs(here.sin_port) == local) { 2211 2212 /* Strip trailing carriage return. */ 2213 if (cp = strchr(user, '\r')) 2214 *cp = 0; 2215 result = user; 2216 } 2217 2218 alarm(0); 2219 close(s); 2220 return (result); 2221 } 2222 #endif 2223
Indexes created Sat Sep 27 22:09:54 GMT 2025