inetd.c revision 1.49
1 /* $NetBSD: inetd.c,v 1.49 1999/07/02 04:48:19 itojun 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 1.49 1999/07/02 04:48:19 itojun 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 * #ifdef IPSEC 167 * Comment lines that start with "#@" denote IPsec policy string, as described 168 * in ipsec_set_policy(3). This will affect all the following items in 169 * inetd.conf(8). To reset the policy, just use "#@" line. By default, 170 * there's no IPsec policy. 171 * #endif 172 */ 173 174 /* 175 * Here's the scoop concerning the user.group feature: 176 * 177 * 1) set-group-option off. 178 * 179 * a) user = root: NO setuid() or setgid() is done 180 * 181 * b) other: setuid() 182 * setgid(primary group as found in passwd) 183 * initgroups(name, primary group) 184 * 185 * 2) set-group-option on. 186 * 187 * a) user = root: NO setuid() 188 * setgid(specified group) 189 * NO initgroups() 190 * 191 * b) other: setuid() 192 * setgid(specified group) 193 * initgroups(name, specified group) 194 * 195 */ 196 197 #include <sys/param.h> 198 #include <sys/stat.h> 199 #include <sys/ioctl.h> 200 #include <sys/socket.h> 201 #include <sys/un.h> 202 #include <sys/wait.h> 203 #include <sys/time.h> 204 #include <sys/resource.h> 205 206 #ifndef RLIMIT_NOFILE 207 #define RLIMIT_NOFILE RLIMIT_OFILE 208 #endif 209 210 #define RPC 211 212 #include <netinet/in.h> 213 #include <arpa/inet.h> 214 #ifdef RPC 215 #include <rpc/rpc.h> 216 #include <rpc/pmap_clnt.h> 217 #endif 218 219 #include <ctype.h> 220 #include <errno.h> 221 #include <fcntl.h> 222 #include <grp.h> 223 #include <netdb.h> 224 #include <pwd.h> 225 #include <signal.h> 226 #include <stdio.h> 227 #include <stdlib.h> 228 #include <string.h> 229 #include <syslog.h> 230 #include <unistd.h> 231 #include <util.h> 232 233 #include "pathnames.h" 234 235 #ifdef IPSEC 236 #include <netinet6/ipsec.h> 237 #ifndef IPSEC_POLICY_IPSEC /* no ipsec support on old ipsec */ 238 #undef IPSEC 239 #endif 240 #endif 241 242 #ifdef LIBWRAP 243 # include <tcpd.h> 244 #ifndef LIBWRAP_ALLOW_FACILITY 245 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH 246 #endif 247 #ifndef LIBWRAP_ALLOW_SEVERITY 248 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO 249 #endif 250 #ifndef LIBWRAP_DENY_FACILITY 251 # define LIBWRAP_DENY_FACILITY LOG_AUTH 252 #endif 253 #ifndef LIBWRAP_DENY_SEVERITY 254 # define LIBWRAP_DENY_SEVERITY LOG_WARNING 255 #endif 256 int allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY; 257 int deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY; 258 #endif 259 260 #define TOOMANY 40 /* don't start more than TOOMANY */ 261 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */ 262 #define RETRYTIME (60*10) /* retry after bind or server fail */ 263 264 #define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM)) 265 266 int debug; 267 #ifdef LIBWRAP 268 int lflag; 269 #endif 270 int nsock, maxsock; 271 fd_set allsock; 272 int options; 273 int timingout; 274 struct servent *sp; 275 char *curdom; 276 277 #ifndef OPEN_MAX 278 #define OPEN_MAX 64 279 #endif 280 281 /* Reserve some descriptors, 3 stdio + at least: 1 log, 1 conf. file */ 282 #define FD_MARGIN (8) 283 typeof(((struct rlimit *)0)->rlim_cur) rlim_ofile_cur = OPEN_MAX; 284 285 #ifdef RLIMIT_NOFILE 286 struct rlimit rlim_ofile; 287 #endif 288 289 struct servtab { 290 char *se_hostaddr; /* host address to listen on */ 291 char *se_service; /* name of service */ 292 int se_socktype; /* type of socket to use */ 293 int se_family; /* address family */ 294 char *se_proto; /* protocol used */ 295 int se_sndbuf; /* sndbuf size */ 296 int se_rcvbuf; /* rcvbuf size */ 297 int se_rpcprog; /* rpc program number */ 298 int se_rpcversl; /* rpc program lowest version */ 299 int se_rpcversh; /* rpc program highest version */ 300 #define isrpcservice(sep) ((sep)->se_rpcversl != 0) 301 short se_wait; /* single threaded server */ 302 short se_checked; /* looked at during merge */ 303 char *se_user; /* user name to run as */ 304 char *se_group; /* group name to run as */ 305 struct biltin *se_bi; /* if built-in, description */ 306 char *se_server; /* server program */ 307 #define MAXARGV 20 308 char *se_argv[MAXARGV+1]; /* program arguments */ 309 #ifdef IPSEC 310 char *se_policy; /* IPsec poilcy string */ 311 #endif 312 int se_fd; /* open descriptor */ 313 int se_type; /* type */ 314 union { 315 struct sockaddr se_un_ctrladdr; 316 struct sockaddr_in se_un_ctrladdr_in; 317 struct sockaddr_in6 se_un_ctrladdr_in6; 318 struct sockaddr_un se_un_ctrladdr_un; 319 } se_un; /* bound address */ 320 #define se_ctrladdr se_un.se_un_ctrladdr 321 #define se_ctrladdr_in se_un.se_un_ctrladdr_in 322 #define se_ctrladdr_un se_un.se_un_ctrladdr_un 323 int se_ctrladdr_size; 324 int se_max; /* max # of instances of this service */ 325 int se_count; /* number started since se_time */ 326 struct timeval se_time; /* start of se_count */ 327 #ifdef MULOG 328 int se_log; 329 #define MULOG_RFC931 0x40000000 330 #endif 331 struct servtab *se_next; 332 } *servtab; 333 334 #define NORM_TYPE 0 335 #define MUX_TYPE 1 336 #define MUXPLUS_TYPE 2 337 #define ISMUX(sep) (((sep)->se_type == MUX_TYPE) || \ 338 ((sep)->se_type == MUXPLUS_TYPE)) 339 #define ISMUXPLUS(sep) ((sep)->se_type == MUXPLUS_TYPE) 340 341 342 void chargen_dg __P((int, struct servtab *)); 343 void chargen_stream __P((int, struct servtab *)); 344 void close_sep __P((struct servtab *)); 345 void config __P((int)); 346 void daytime_dg __P((int, struct servtab *)); 347 void daytime_stream __P((int, struct servtab *)); 348 void discard_dg __P((int, struct servtab *)); 349 void discard_stream __P((int, struct servtab *)); 350 void echo_dg __P((int, struct servtab *)); 351 void echo_stream __P((int, struct servtab *)); 352 void endconfig __P((void)); 353 struct servtab *enter __P((struct servtab *)); 354 void freeconfig __P((struct servtab *)); 355 struct servtab *getconfigent __P((void)); 356 void goaway __P((int)); 357 void machtime_dg __P((int, struct servtab *)); 358 void machtime_stream __P((int, struct servtab *)); 359 char *newstr __P((char *)); 360 char *nextline __P((FILE *)); 361 void print_service __P((char *, struct servtab *)); 362 void reapchild __P((int)); 363 void retry __P((int)); 364 void run_service __P((int, struct servtab *)); 365 int setconfig __P((void)); 366 void setup __P((struct servtab *)); 367 #ifdef IPSEC 368 void ipsecsetup __P((struct servtab *)); 369 #endif 370 char *sskip __P((char **)); 371 char *skip __P((char **)); 372 void tcpmux __P((int, struct servtab *)); 373 void usage __P((void)); 374 void register_rpc __P((struct servtab *sep)); 375 void unregister_rpc __P((struct servtab *sep)); 376 void bump_nofile __P((void)); 377 void inetd_setproctitle __P((char *, int)); 378 void initring __P((void)); 379 long machtime __P((void)); 380 int port_good_dg __P((struct sockaddr *sa)); 381 static int getline __P((int, char *, int)); 382 int main __P((int, char *[], char *[])); 383 384 struct biltin { 385 char *bi_service; /* internally provided service name */ 386 int bi_socktype; /* type of socket supported */ 387 short bi_fork; /* 1 if should fork before call */ 388 short bi_wait; /* 1 if should wait for child */ 389 void (*bi_fn) __P((int, struct servtab *)); 390 /* function which performs it */ 391 } biltins[] = { 392 /* Echo received data */ 393 { "echo", SOCK_STREAM, 1, 0, echo_stream }, 394 { "echo", SOCK_DGRAM, 0, 0, echo_dg }, 395 396 /* Internet /dev/null */ 397 { "discard", SOCK_STREAM, 1, 0, discard_stream }, 398 { "discard", SOCK_DGRAM, 0, 0, discard_dg }, 399 400 /* Return 32 bit time since 1970 */ 401 { "time", SOCK_STREAM, 0, 0, machtime_stream }, 402 { "time", SOCK_DGRAM, 0, 0, machtime_dg }, 403 404 /* Return human-readable time */ 405 { "daytime", SOCK_STREAM, 0, 0, daytime_stream }, 406 { "daytime", SOCK_DGRAM, 0, 0, daytime_dg }, 407 408 /* Familiar character generator */ 409 { "chargen", SOCK_STREAM, 1, 0, chargen_stream }, 410 { "chargen", SOCK_DGRAM, 0, 0, chargen_dg }, 411 412 { "tcpmux", SOCK_STREAM, 1, 0, tcpmux }, 413 414 { NULL } 415 }; 416 417 /* list of "bad" ports. I.e. ports that are most obviously used for 418 * "cycling packets" denial of service attacks. See /etc/services. 419 * List must end with port number "0". 420 */ 421 422 u_int16_t bad_ports[] = { 7, 9, 13, 19, 37, 0}; 423 424 425 #define NUMINT (sizeof(intab) / sizeof(struct inent)) 426 char *CONFIG = _PATH_INETDCONF; 427 char **Argv; 428 char *LastArg; 429 extern char *__progname; 430 431 #ifdef sun 432 /* 433 * Sun's RPC library caches the result of `dtablesize()' 434 * This is incompatible with our "bumping" of file descriptors "on demand" 435 */ 436 int 437 _rpc_dtablesize() 438 { 439 return rlim_ofile_cur; 440 } 441 #endif 442 443 int 444 main(argc, argv, envp) 445 int argc; 446 char *argv[], *envp[]; 447 { 448 struct servtab *sep, *nsep; 449 struct sigvec sv; 450 int ch, dofork; 451 pid_t pid; 452 453 Argv = argv; 454 if (envp == 0 || *envp == 0) 455 envp = argv; 456 while (*envp) 457 envp++; 458 LastArg = envp[-1] + strlen(envp[-1]); 459 460 while ((ch = getopt(argc, argv, 461 #ifdef LIBWRAP 462 "dl" 463 #else 464 "d" 465 #endif 466 )) != -1) 467 switch(ch) { 468 case 'd': 469 debug = 1; 470 options |= SO_DEBUG; 471 break; 472 #ifdef LIBWRAP 473 case 'l': 474 lflag = 1; 475 break; 476 #endif 477 case '?': 478 default: 479 usage(); 480 } 481 argc -= optind; 482 argv += optind; 483 484 if (argc > 0) 485 CONFIG = argv[0]; 486 487 if (debug == 0) 488 daemon(0, 0); 489 openlog(__progname, LOG_PID | LOG_NOWAIT, LOG_DAEMON); 490 pidfile(NULL); 491 492 #ifdef RLIMIT_NOFILE 493 if (getrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) { 494 syslog(LOG_ERR, "getrlimit: %m"); 495 } else { 496 rlim_ofile_cur = rlim_ofile.rlim_cur; 497 if (rlim_ofile_cur == RLIM_INFINITY) /* ! */ 498 rlim_ofile_cur = OPEN_MAX; 499 } 500 #endif 501 502 memset(&sv, 0, sizeof(sv)); 503 sv.sv_mask = SIGBLOCK; 504 sv.sv_handler = retry; 505 sigvec(SIGALRM, &sv, (struct sigvec *)0); 506 config(SIGHUP); 507 sv.sv_handler = config; 508 sigvec(SIGHUP, &sv, (struct sigvec *)0); 509 sv.sv_handler = reapchild; 510 sigvec(SIGCHLD, &sv, (struct sigvec *)0); 511 sv.sv_handler = goaway; 512 sigvec(SIGTERM, &sv, (struct sigvec *)0); 513 sv.sv_handler = goaway; 514 sigvec(SIGINT, &sv, (struct sigvec *)0); 515 sv.sv_mask = 0L; 516 sv.sv_handler = SIG_IGN; 517 sigvec(SIGPIPE, &sv, (struct sigvec *)0); 518 519 { 520 /* space for daemons to overwrite environment for ps */ 521 #define DUMMYSIZE 100 522 char dummy[DUMMYSIZE]; 523 524 (void)memset(dummy, 'x', DUMMYSIZE - 1); 525 dummy[DUMMYSIZE - 1] = '\0'; 526 527 (void)setenv("inetd_dummy", dummy, 1); 528 } 529 530 for (;;) { 531 int n, ctrl; 532 fd_set readable; 533 534 if (nsock == 0) { 535 (void) sigblock(SIGBLOCK); 536 while (nsock == 0) 537 sigpause(0L); 538 (void) sigsetmask(0L); 539 } 540 readable = allsock; 541 if ((n = select(maxsock + 1, &readable, (fd_set *)0, 542 (fd_set *)0, (struct timeval *)0)) <= 0) { 543 if (n == -1 && errno != EINTR) { 544 syslog(LOG_WARNING, "select: %m"); 545 sleep(1); 546 } 547 continue; 548 } 549 for (sep = servtab; n && sep; sep = nsep) { 550 nsep = sep->se_next; 551 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) { 552 n--; 553 if (debug) 554 fprintf(stderr, "someone wants %s\n", sep->se_service); 555 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 556 /* XXX here do the libwrap check-before-accept */ 557 ctrl = accept(sep->se_fd, (struct sockaddr *)0, 558 (int *)0); 559 if (debug) 560 fprintf(stderr, "accept, ctrl %d\n", ctrl); 561 if (ctrl < 0) { 562 if (errno != EINTR) 563 syslog(LOG_WARNING, 564 "accept (for %s): %m", 565 sep->se_service); 566 continue; 567 } 568 } else 569 ctrl = sep->se_fd; 570 (void) sigblock(SIGBLOCK); 571 pid = 0; 572 #ifdef LIBWRAP_INTERNAL 573 dofork = 1; 574 #else 575 dofork = (sep->se_bi == 0 || sep->se_bi->bi_fork); 576 #endif 577 if (dofork) { 578 if (sep->se_count++ == 0) 579 (void)gettimeofday(&sep->se_time, 580 (struct timezone *)0); 581 else if (sep->se_count >= sep->se_max) { 582 struct timeval now; 583 584 (void)gettimeofday(&now, (struct timezone *)0); 585 if (now.tv_sec - sep->se_time.tv_sec > 586 CNT_INTVL) { 587 sep->se_time = now; 588 sep->se_count = 1; 589 } else { 590 syslog(LOG_ERR, 591 "%s/%s server failing (looping), service terminated\n", 592 sep->se_service, sep->se_proto); 593 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 594 close(ctrl); 595 close_sep(sep); 596 sigsetmask(0L); 597 if (!timingout) { 598 timingout = 1; 599 alarm(RETRYTIME); 600 } 601 continue; 602 } 603 } 604 pid = fork(); 605 if (pid < 0) { 606 syslog(LOG_ERR, "fork: %m"); 607 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 608 close(ctrl); 609 sigsetmask(0L); 610 sleep(1); 611 continue; 612 } 613 if (pid != 0 && sep->se_wait) { 614 sep->se_wait = pid; 615 FD_CLR(sep->se_fd, &allsock); 616 nsock--; 617 } 618 if (pid == 0) { 619 sv.sv_mask = 0L; 620 sv.sv_handler = SIG_DFL; 621 sigvec(SIGPIPE, &sv, (struct sigvec *)0); 622 if (debug) 623 setsid(); 624 } 625 } 626 sigsetmask(0L); 627 if (pid == 0) { 628 run_service(ctrl, sep); 629 if (dofork) 630 exit(0); 631 } 632 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 633 close(ctrl); 634 } 635 } 636 } 637 } 638 639 void 640 run_service(ctrl, sep) 641 int ctrl; 642 struct servtab *sep; 643 { 644 struct passwd *pwd; 645 struct group *grp = NULL; /* XXX gcc */ 646 char buf[7]; 647 #ifdef LIBWRAP 648 struct request_info req; 649 int denied; 650 char *service = NULL; /* XXX gcc */ 651 #endif 652 653 #ifdef LIBWRAP 654 #ifndef LIBWRAP_INTERNAL 655 if (sep->se_bi == 0) 656 #endif 657 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 658 request_init(&req, RQ_DAEMON, sep->se_argv[0] ? 659 sep->se_argv[0] : sep->se_service, RQ_FILE, ctrl, NULL); 660 fromhost(&req); 661 denied = !hosts_access(&req); 662 if (denied || lflag) { 663 sp = getservbyport(sep->se_ctrladdr_in.sin_port, 664 sep->se_proto); 665 if (sp == NULL) { 666 (void)snprintf(buf, sizeof buf, "%d", 667 ntohs(sep->se_ctrladdr_in.sin_port)); 668 service = buf; 669 } else 670 service = sp->s_name; 671 } 672 if (denied) { 673 syslog(deny_severity, 674 "refused connection from %.500s, service %s (%s)", 675 eval_client(&req), service, sep->se_proto); 676 goto reject; 677 } 678 if (lflag) { 679 syslog(allow_severity, 680 "connection from %.500s, service %s (%s)", 681 eval_client(&req), service, sep->se_proto); 682 } 683 } 684 #endif /* LIBWRAP */ 685 686 if (sep->se_bi) { 687 (*sep->se_bi->bi_fn)(ctrl, sep); 688 } else { 689 if ((pwd = getpwnam(sep->se_user)) == NULL) { 690 syslog(LOG_ERR, "%s/%s: %s: No such user", 691 sep->se_service, sep->se_proto, sep->se_user); 692 goto reject; 693 } 694 if (sep->se_group && 695 (grp = getgrnam(sep->se_group)) == NULL) { 696 syslog(LOG_ERR, "%s/%s: %s: No such group", 697 sep->se_service, sep->se_proto, sep->se_group); 698 goto reject; 699 } 700 if (pwd->pw_uid) { 701 if (sep->se_group) 702 pwd->pw_gid = grp->gr_gid; 703 if (setgid(pwd->pw_gid) < 0) { 704 syslog(LOG_ERR, 705 "%s/%s: can't set gid %d: %m", sep->se_service, 706 sep->se_proto, pwd->pw_gid); 707 goto reject; 708 } 709 (void) initgroups(pwd->pw_name, 710 pwd->pw_gid); 711 if (setuid(pwd->pw_uid) < 0) { 712 syslog(LOG_ERR, 713 "%s/%s: can't set uid %d: %m", sep->se_service, 714 sep->se_proto, pwd->pw_uid); 715 goto reject; 716 } 717 } else if (sep->se_group) { 718 (void) setgid((gid_t)grp->gr_gid); 719 } 720 if (debug) 721 fprintf(stderr, "%d execl %s\n", 722 getpid(), sep->se_server); 723 #ifdef MULOG 724 if (sep->se_log) 725 dolog(sep, ctrl); 726 #endif 727 /* Set our control descriptor to not close-on-exec... */ 728 if (fcntl(ctrl, F_SETFD, 0) < 0) 729 syslog(LOG_ERR, "fcntl (F_SETFD, 0): %m"); 730 /* ...and dup it to stdin, stdout, and stderr. */ 731 if (ctrl != 0) { 732 dup2(ctrl, 0); 733 close(ctrl); 734 ctrl = 0; 735 } 736 dup2(0, 1); 737 dup2(0, 2); 738 #ifdef RLIMIT_NOFILE 739 if (rlim_ofile.rlim_cur != rlim_ofile_cur && 740 setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) 741 syslog(LOG_ERR, "setrlimit: %m"); 742 #endif 743 execv(sep->se_server, sep->se_argv); 744 syslog(LOG_ERR, "cannot execute %s: %m", sep->se_server); 745 reject: 746 if (sep->se_socktype != SOCK_STREAM) 747 recv(ctrl, buf, sizeof (buf), 0); 748 _exit(1); 749 } 750 } 751 752 void 753 reapchild(signo) 754 int signo; 755 { 756 int status; 757 pid_t pid; 758 struct servtab *sep; 759 760 for (;;) { 761 pid = wait3(&status, WNOHANG, (struct rusage *)0); 762 if (pid <= 0) 763 break; 764 if (debug) 765 fprintf(stderr, "%d reaped, status %#x\n", 766 pid, status); 767 for (sep = servtab; sep; sep = sep->se_next) 768 if (sep->se_wait == pid) { 769 if (WIFEXITED(status) && WEXITSTATUS(status)) 770 syslog(LOG_WARNING, 771 "%s: exit status 0x%x", 772 sep->se_server, WEXITSTATUS(status)); 773 else if (WIFSIGNALED(status)) 774 syslog(LOG_WARNING, 775 "%s: exit signal 0x%x", 776 sep->se_server, WTERMSIG(status)); 777 sep->se_wait = 1; 778 FD_SET(sep->se_fd, &allsock); 779 nsock++; 780 if (debug) 781 fprintf(stderr, "restored %s, fd %d\n", 782 sep->se_service, sep->se_fd); 783 } 784 } 785 } 786 787 void 788 config(signo) 789 int signo; 790 { 791 struct servtab *sep, *cp, **sepp; 792 long omask; 793 int n; 794 795 if (!setconfig()) { 796 syslog(LOG_ERR, "%s: %m", CONFIG); 797 return; 798 } 799 for (sep = servtab; sep; sep = sep->se_next) 800 sep->se_checked = 0; 801 while ((cp = getconfigent())) { 802 for (sep = servtab; sep; sep = sep->se_next) 803 if (strcmp(sep->se_service, cp->se_service) == 0 && 804 strcmp(sep->se_hostaddr, cp->se_hostaddr) == 0 && 805 strcmp(sep->se_proto, cp->se_proto) == 0 && 806 ISMUX(sep) == ISMUX(cp)) 807 break; 808 if (sep != 0) { 809 int i; 810 811 #define SWAP(type, a, b) {type c=(type)a; (type)a=(type)b; (type)b=(type)c;} 812 813 omask = sigblock(SIGBLOCK); 814 /* 815 * sep->se_wait may be holding the pid of a daemon 816 * that we're waiting for. If so, don't overwrite 817 * it unless the config file explicitly says don't 818 * wait. 819 */ 820 if (cp->se_bi == 0 && 821 (sep->se_wait == 1 || cp->se_wait == 0)) 822 sep->se_wait = cp->se_wait; 823 SWAP(char *, sep->se_user, cp->se_user); 824 SWAP(char *, sep->se_group, cp->se_group); 825 SWAP(char *, sep->se_server, cp->se_server); 826 for (i = 0; i < MAXARGV; i++) 827 SWAP(char *, sep->se_argv[i], cp->se_argv[i]); 828 #ifdef IPSEC 829 SWAP(char *, sep->se_policy, cp->se_policy); 830 ipsecsetup(sep); 831 #endif 832 SWAP(int, cp->se_type, sep->se_type); 833 SWAP(int, cp->se_max, sep->se_max); 834 #undef SWAP 835 if (isrpcservice(sep)) 836 unregister_rpc(sep); 837 sep->se_rpcversl = cp->se_rpcversl; 838 sep->se_rpcversh = cp->se_rpcversh; 839 sigsetmask(omask); 840 freeconfig(cp); 841 if (debug) 842 print_service("REDO", sep); 843 } else { 844 sep = enter(cp); 845 if (debug) 846 print_service("ADD ", sep); 847 } 848 sep->se_checked = 1; 849 850 switch (sep->se_family) { 851 case AF_LOCAL: 852 if (sep->se_fd != -1) 853 break; 854 n = strlen(sep->se_service); 855 if (n > sizeof(sep->se_ctrladdr_un.sun_path)) { 856 syslog(LOG_ERR, "%s: address too long", 857 sep->se_service); 858 sep->se_checked = 0; 859 continue; 860 } 861 (void)unlink(sep->se_service); 862 strncpy(sep->se_ctrladdr_un.sun_path, 863 sep->se_service, n); 864 sep->se_ctrladdr_un.sun_family = AF_LOCAL; 865 sep->se_ctrladdr_size = n + 866 sizeof(sep->se_ctrladdr_un) - 867 sizeof(sep->se_ctrladdr_un.sun_path); 868 if (!ISMUX(sep)) 869 setup(sep); 870 break; 871 case AF_INET: 872 case AF_INET6: 873 { 874 struct addrinfo hints, *res; 875 char *host, *port; 876 int error; 877 878 memset(&hints, 0, sizeof(hints)); 879 hints.ai_family = sep->se_family; 880 hints.ai_socktype = sep->se_socktype; 881 if (!strcmp(sep->se_hostaddr, "*")) { 882 hints.ai_flags = AI_PASSIVE; 883 host = NULL; 884 } else 885 host = sep->se_hostaddr; 886 if (isrpcservice(sep) || ISMUX(sep)) 887 port = "0"; 888 else 889 port = sep->se_service; 890 error = getaddrinfo(host, port, &hints, &res); 891 if (error) { 892 syslog(LOG_ERR, "%s: %s", 893 sep->se_hostaddr, gai_strerror(error)); 894 sep->se_checked = 0; 895 continue; 896 } 897 if (res->ai_next) { 898 syslog(LOG_ERR, "%s: resolved to multiple addr", 899 sep->se_hostaddr); 900 sep->se_checked = 0; 901 freeaddrinfo(res); 902 continue; 903 } 904 memcpy(&sep->se_ctrladdr, res->ai_addr, 905 res->ai_addrlen); 906 if (ISMUX(sep)) { 907 sep->se_fd = -1; 908 freeaddrinfo(res); 909 continue; 910 } 911 sep->se_ctrladdr_size = res->ai_addrlen; 912 freeaddrinfo(res); 913 if (isrpcservice(sep)) { 914 struct rpcent *rp; 915 916 sep->se_rpcprog = atoi(sep->se_service); 917 if (sep->se_rpcprog == 0) { 918 rp = getrpcbyname(sep->se_service); 919 if (rp == 0) { 920 syslog(LOG_ERR, 921 "%s/%s: unknown service", 922 sep->se_service, 923 sep->se_proto); 924 sep->se_checked = 0; 925 continue; 926 } 927 sep->se_rpcprog = rp->r_number; 928 } 929 if (sep->se_fd == -1 && !ISMUX(sep)) 930 setup(sep); 931 if (sep->se_fd != -1) 932 register_rpc(sep); 933 } else { 934 if (sep->se_fd >= 0) 935 close_sep(sep); 936 if (sep->se_fd == -1 && !ISMUX(sep)) 937 setup(sep); 938 } 939 } 940 } 941 } 942 endconfig(); 943 /* 944 * Purge anything not looked at above. 945 */ 946 omask = sigblock(SIGBLOCK); 947 sepp = &servtab; 948 while ((sep = *sepp)) { 949 if (sep->se_checked) { 950 sepp = &sep->se_next; 951 continue; 952 } 953 *sepp = sep->se_next; 954 if (sep->se_fd >= 0) 955 close_sep(sep); 956 if (isrpcservice(sep)) 957 unregister_rpc(sep); 958 if (sep->se_family == AF_LOCAL) 959 (void)unlink(sep->se_service); 960 if (debug) 961 print_service("FREE", sep); 962 freeconfig(sep); 963 free((char *)sep); 964 } 965 (void) sigsetmask(omask); 966 } 967 968 void 969 retry(signo) 970 int signo; 971 { 972 struct servtab *sep; 973 974 timingout = 0; 975 for (sep = servtab; sep; sep = sep->se_next) { 976 if (sep->se_fd == -1 && !ISMUX(sep)) { 977 switch (sep->se_family) { 978 case AF_LOCAL: 979 case AF_INET: 980 case AF_INET6: 981 setup(sep); 982 if (sep->se_fd != -1 && isrpcservice(sep)) 983 register_rpc(sep); 984 break; 985 } 986 } 987 } 988 } 989 990 void 991 goaway(signo) 992 int signo; 993 { 994 struct servtab *sep; 995 996 for (sep = servtab; sep; sep = sep->se_next) { 997 if (sep->se_fd == -1) 998 continue; 999 1000 switch (sep->se_family) { 1001 case AF_LOCAL: 1002 (void)unlink(sep->se_service); 1003 break; 1004 case AF_INET: 1005 case AF_INET6: 1006 if (sep->se_wait == 1 && isrpcservice(sep)) 1007 unregister_rpc(sep); 1008 break; 1009 } 1010 (void)close(sep->se_fd); 1011 } 1012 exit(0); 1013 } 1014 1015 void 1016 setup(sep) 1017 struct servtab *sep; 1018 { 1019 int on = 1; 1020 1021 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) { 1022 if (debug) 1023 fprintf(stderr, "socket failed on %s/%s: %s\n", 1024 sep->se_service, sep->se_proto, strerror(errno)); 1025 syslog(LOG_ERR, "%s/%s: socket: %m", 1026 sep->se_service, sep->se_proto); 1027 return; 1028 } 1029 /* Set all listening sockets to close-on-exec. */ 1030 if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) 1031 syslog(LOG_ERR, "fcntl (F_SETFD, FD_CLOEXEC): %m"); 1032 1033 #define turnon(fd, opt) \ 1034 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 1035 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 1036 turnon(sep->se_fd, SO_DEBUG) < 0) 1037 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 1038 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 1039 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 1040 #undef turnon 1041 1042 /* Set the socket buffer sizes, if specified. */ 1043 if (sep->se_sndbuf != 0 && setsockopt(sep->se_fd, SOL_SOCKET, 1044 SO_SNDBUF, (char *)&sep->se_sndbuf, sizeof(sep->se_sndbuf)) < 0) 1045 syslog(LOG_ERR, "setsockopt (SO_SNDBUF %d): %m", 1046 sep->se_sndbuf); 1047 if (sep->se_rcvbuf != 0 && setsockopt(sep->se_fd, SOL_SOCKET, 1048 SO_RCVBUF, (char *)&sep->se_rcvbuf, sizeof(sep->se_rcvbuf)) < 0) 1049 syslog(LOG_ERR, "setsockopt (SO_RCVBUF %d): %m", 1050 sep->se_rcvbuf); 1051 #ifdef IPSEC 1052 ipsecsetup(sep); 1053 #endif 1054 1055 if (bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size) < 0) { 1056 if (debug) 1057 fprintf(stderr, "bind failed on %s/%s: %s\n", 1058 sep->se_service, sep->se_proto, strerror(errno)); 1059 syslog(LOG_ERR, "%s/%s: bind: %m", 1060 sep->se_service, sep->se_proto); 1061 (void) close(sep->se_fd); 1062 sep->se_fd = -1; 1063 if (!timingout) { 1064 timingout = 1; 1065 alarm(RETRYTIME); 1066 } 1067 return; 1068 } 1069 if (sep->se_socktype == SOCK_STREAM) 1070 listen(sep->se_fd, 10); 1071 1072 FD_SET(sep->se_fd, &allsock); 1073 nsock++; 1074 if (sep->se_fd > maxsock) { 1075 maxsock = sep->se_fd; 1076 if (maxsock > rlim_ofile_cur - FD_MARGIN) 1077 bump_nofile(); 1078 } 1079 if (debug) 1080 fprintf(stderr, "registered %s on %d\n", 1081 sep->se_server, sep->se_fd); 1082 } 1083 1084 #ifdef IPSEC 1085 void 1086 ipsecsetup(sep) 1087 struct servtab *sep; 1088 { 1089 int len; 1090 char *buf; 1091 char *policy; 1092 int level, opt; 1093 1094 switch (sep->se_family) { 1095 case AF_INET: 1096 level = IPPROTO_IP; 1097 opt = IP_IPSEC_POLICY; 1098 break; 1099 case AF_INET6: 1100 level = IPPROTO_IPV6; 1101 opt = IPV6_IPSEC_POLICY; 1102 break; 1103 default: 1104 return; 1105 } 1106 1107 if (!sep->se_policy || sep->se_policy[0] == '\0') 1108 policy = "entrust"; 1109 else 1110 policy = sep->se_policy; 1111 1112 len = ipsec_get_policylen(policy); 1113 if (len >= 0 && (buf = (char *)malloc(len)) != NULL) { 1114 ipsec_set_policy(buf, len, policy); 1115 if (setsockopt(sep->se_fd, level, opt, buf, len) < 0) { 1116 syslog(LOG_ERR, "setsockopt (IP_IPSEC_POLICY, %s): %m", 1117 policy); 1118 } 1119 free(buf); 1120 } else 1121 syslog(LOG_ERR, "invalid security policy \"%s\"", policy); 1122 } 1123 #endif 1124 1125 /* 1126 * Finish with a service and its socket. 1127 */ 1128 void 1129 close_sep(sep) 1130 struct servtab *sep; 1131 { 1132 if (sep->se_fd >= 0) { 1133 nsock--; 1134 FD_CLR(sep->se_fd, &allsock); 1135 (void) close(sep->se_fd); 1136 sep->se_fd = -1; 1137 } 1138 sep->se_count = 0; 1139 /* 1140 * Don't keep the pid of this running deamon: when reapchild() 1141 * reaps this pid, it would erroneously increment nsock. 1142 */ 1143 if (sep->se_wait > 1) 1144 sep->se_wait = 1; 1145 } 1146 1147 void 1148 register_rpc(sep) 1149 struct servtab *sep; 1150 { 1151 #ifdef RPC 1152 int n; 1153 struct sockaddr_storage ss; 1154 struct sockaddr_in *sin = (struct sockaddr_in *)&ss; 1155 struct protoent *pp; 1156 1157 if ((pp = getprotobyname(sep->se_proto+4)) == NULL) { 1158 syslog(LOG_ERR, "%s: getproto: %m", 1159 sep->se_proto); 1160 return; 1161 } 1162 n = sizeof ss; 1163 if (getsockname(sep->se_fd, (struct sockaddr *)&ss, &n) < 0) { 1164 syslog(LOG_ERR, "%s/%s: getsockname: %m", 1165 sep->se_service, sep->se_proto); 1166 return; 1167 } 1168 if (ss.ss_family != AF_INET) { /*XXX*/ 1169 syslog(LOG_ERR, "%s/%s: rpc not supported", 1170 sep->se_service, sep->se_proto); 1171 return; 1172 } 1173 1174 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1175 if (debug) 1176 fprintf(stderr, "pmap_set: %u %u %u %u\n", 1177 sep->se_rpcprog, n, pp->p_proto, 1178 ntohs(sin->sin_port)); 1179 (void)pmap_unset(sep->se_rpcprog, n); 1180 if (!pmap_set(sep->se_rpcprog, n, pp->p_proto, ntohs(sin->sin_port))) 1181 syslog(LOG_ERR, "pmap_set: %u %u %u %u: %m", 1182 sep->se_rpcprog, n, pp->p_proto, 1183 ntohs(sin->sin_port)); 1184 } 1185 #endif /* RPC */ 1186 } 1187 1188 void 1189 unregister_rpc(sep) 1190 struct servtab *sep; 1191 { 1192 #ifdef RPC 1193 int n; 1194 1195 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1196 if (debug) 1197 fprintf(stderr, "pmap_unset(%u, %u)\n", 1198 sep->se_rpcprog, n); 1199 if (!pmap_unset(sep->se_rpcprog, n)) 1200 syslog(LOG_ERR, "pmap_unset(%u, %u)\n", 1201 sep->se_rpcprog, n); 1202 } 1203 #endif /* RPC */ 1204 } 1205 1206 1207 struct servtab * 1208 enter(cp) 1209 struct servtab *cp; 1210 { 1211 struct servtab *sep; 1212 long omask; 1213 1214 sep = (struct servtab *)malloc(sizeof (*sep)); 1215 if (sep == (struct servtab *)0) { 1216 syslog(LOG_ERR, "Out of memory."); 1217 exit(-1); 1218 } 1219 *sep = *cp; 1220 sep->se_fd = -1; 1221 sep->se_rpcprog = -1; 1222 omask = sigblock(SIGBLOCK); 1223 sep->se_next = servtab; 1224 servtab = sep; 1225 sigsetmask(omask); 1226 return (sep); 1227 } 1228 1229 FILE *fconfig = NULL; 1230 struct servtab serv; 1231 char line[LINE_MAX]; 1232 char *defhost; 1233 1234 int 1235 setconfig() 1236 { 1237 if (defhost) free(defhost); 1238 defhost = newstr("*"); 1239 if (fconfig != NULL) { 1240 fseek(fconfig, 0L, SEEK_SET); 1241 return (1); 1242 } 1243 fconfig = fopen(CONFIG, "r"); 1244 return (fconfig != NULL); 1245 } 1246 1247 void 1248 endconfig() 1249 { 1250 if (fconfig) { 1251 (void) fclose(fconfig); 1252 fconfig = NULL; 1253 } 1254 if (defhost) { 1255 free(defhost); 1256 defhost = 0; 1257 } 1258 } 1259 1260 struct servtab * 1261 getconfigent() 1262 { 1263 struct servtab *sep = &serv; 1264 int argc, val; 1265 char *cp, *cp0, *arg, *buf0, *buf1, *sz0, *sz1; 1266 static char TCPMUX_TOKEN[] = "tcpmux/"; 1267 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) 1268 char *hostdelim; 1269 #ifdef IPSEC 1270 char *policy = NULL; 1271 #endif 1272 1273 more: 1274 while ((cp = nextline(fconfig))) { 1275 #ifdef IPSEC 1276 /* lines starting with #@ is not a comment, but the policy */ 1277 if (cp[0] == '#' && cp[1] == '@') { 1278 char *p; 1279 for (p = cp + 2; p && *p && isspace(*p); p++) 1280 ; 1281 if (*p == '\0') { 1282 if (policy) 1283 free(policy); 1284 policy = NULL; 1285 } else if (ipsec_get_policylen(p) >= 0) { 1286 if (policy) 1287 free(policy); 1288 policy = newstr(p); 1289 } else { 1290 syslog(LOG_ERR, 1291 "%s: invalid ipsec policy \"%s\"", 1292 CONFIG, p); 1293 exit(-1); 1294 } 1295 } 1296 #endif 1297 if (*cp == '#' || *cp == '\0') 1298 continue; 1299 #ifdef MULOG 1300 /* Avoid use of `skip' if there is a danger of it looking 1301 * at continuation lines. 1302 */ 1303 do { 1304 cp++; 1305 } while (*cp == ' ' || *cp == '\t'); 1306 if (*cp == '\0') 1307 continue; 1308 if ((arg = skip(&cp)) == NULL) 1309 continue; 1310 if (strcmp(arg, "DOMAIN")) 1311 continue; 1312 if (curdom) 1313 free(curdom); 1314 curdom = NULL; 1315 while (*cp == ' ' || *cp == '\t') 1316 cp++; 1317 if (*cp == '\0') 1318 continue; 1319 arg = cp; 1320 while (*cp && *cp != ' ' && *cp != '\t') 1321 cp++; 1322 if (*cp != '\0') 1323 *cp++ = '\0'; 1324 curdom = newstr(arg); 1325 #endif 1326 break; 1327 } 1328 if (cp == NULL) 1329 return ((struct servtab *)0); 1330 /* 1331 * clear the static buffer, since some fields (se_ctrladdr, 1332 * for example) don't get initialized here. 1333 */ 1334 memset((caddr_t)sep, 0, sizeof *sep); 1335 arg = skip(&cp); 1336 if (cp == NULL) { 1337 /* got an empty line containing just blanks/tabs. */ 1338 goto more; 1339 } 1340 /* Check for a host name. */ 1341 hostdelim = strrchr(arg, ':'); 1342 if (hostdelim) { 1343 *hostdelim = '\0'; 1344 sep->se_hostaddr = newstr(arg); 1345 arg = hostdelim + 1; 1346 /* 1347 * If the line is of the form `host:', then just change the 1348 * default host for the following lines. 1349 */ 1350 if (*arg == '\0') { 1351 arg = skip(&cp); 1352 if (cp == NULL) { 1353 free(defhost); 1354 defhost = sep->se_hostaddr; 1355 goto more; 1356 } 1357 } 1358 } else 1359 sep->se_hostaddr = newstr(defhost); 1360 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1361 char *c = arg + MUX_LEN; 1362 if (*c == '+') { 1363 sep->se_type = MUXPLUS_TYPE; 1364 c++; 1365 } else 1366 sep->se_type = MUX_TYPE; 1367 sep->se_service = newstr(c); 1368 } else { 1369 sep->se_service = newstr(arg); 1370 sep->se_type = NORM_TYPE; 1371 } 1372 1373 arg = sskip(&cp); 1374 if (strcmp(arg, "stream") == 0) 1375 sep->se_socktype = SOCK_STREAM; 1376 else if (strcmp(arg, "dgram") == 0) 1377 sep->se_socktype = SOCK_DGRAM; 1378 else if (strcmp(arg, "rdm") == 0) 1379 sep->se_socktype = SOCK_RDM; 1380 else if (strcmp(arg, "seqpacket") == 0) 1381 sep->se_socktype = SOCK_SEQPACKET; 1382 else if (strcmp(arg, "raw") == 0) 1383 sep->se_socktype = SOCK_RAW; 1384 else 1385 sep->se_socktype = -1; 1386 1387 sep->se_proto = newstr(sskip(&cp)); 1388 1389 #define MALFORMED(arg) \ 1390 do { \ 1391 syslog(LOG_ERR, "%s: malformed buffer size option `%s'", \ 1392 sep->se_service, (arg)); \ 1393 goto more; \ 1394 } while (0) 1395 1396 #define GETVAL(arg) \ 1397 do { \ 1398 if (!isdigit(*(arg))) \ 1399 MALFORMED(arg); \ 1400 val = strtol((arg), &cp0, 10); \ 1401 if (cp0 != NULL) { \ 1402 if (cp0[1] != '\0') \ 1403 MALFORMED((arg)); \ 1404 if (cp0[0] == 'k') \ 1405 val *= 1024; \ 1406 if (cp0[0] == 'm') \ 1407 val *= 1024 * 1024; \ 1408 } \ 1409 if (val < 1) { \ 1410 syslog(LOG_ERR, "%s: invalid buffer size `%s'", \ 1411 sep->se_service, (arg)); \ 1412 goto more; \ 1413 } \ 1414 } while (0) 1415 1416 #define ASSIGN(arg) \ 1417 do { \ 1418 if (strcmp((arg), "sndbuf") == 0) \ 1419 sep->se_sndbuf = val; \ 1420 else if (strcmp((arg), "rcvbuf") == 0) \ 1421 sep->se_rcvbuf = val; \ 1422 else \ 1423 MALFORMED((arg)); \ 1424 } while (0) 1425 1426 /* 1427 * Extract the send and receive buffer sizes before parsing 1428 * the protocol. 1429 */ 1430 sep->se_sndbuf = sep->se_rcvbuf = 0; 1431 buf0 = buf1 = sz0 = sz1 = NULL; 1432 if ((buf0 = strchr(sep->se_proto, ',')) != NULL) { 1433 /* Not meaningful for Tcpmux services. */ 1434 if (sep->se_type != NORM_TYPE) { 1435 syslog(LOG_ERR, "%s: can't specify buffer sizes for " 1436 "tcpmux services", sep->se_service); 1437 goto more; 1438 } 1439 1440 /* Skip the , */ 1441 *buf0++ = '\0'; 1442 1443 /* Check to see if another socket buffer size was specified. */ 1444 if ((buf1 = strchr(buf0, ',')) != NULL) { 1445 /* Skip the , */ 1446 *buf1++ = '\0'; 1447 1448 /* Make sure a 3rd one wasn't specified. */ 1449 if (strchr(buf1, ',') != NULL) { 1450 syslog(LOG_ERR, "%s: too many buffer sizes", 1451 sep->se_service); 1452 goto more; 1453 } 1454 1455 /* Locate the size. */ 1456 if ((sz1 = strchr(buf1, '=')) == NULL) 1457 MALFORMED(buf1); 1458 1459 /* Skip the = */ 1460 *sz1++ = '\0'; 1461 } 1462 1463 /* Locate the size. */ 1464 if ((sz0 = strchr(buf0, '=')) == NULL) 1465 MALFORMED(buf0); 1466 1467 /* Skip the = */ 1468 *sz0++ = '\0'; 1469 1470 GETVAL(sz0); 1471 ASSIGN(buf0); 1472 1473 if (buf1 != NULL) { 1474 GETVAL(sz1); 1475 ASSIGN(buf1); 1476 } 1477 } 1478 1479 #undef ASSIGN 1480 #undef GETVAL 1481 #undef MALFORMED 1482 1483 if (strcmp(sep->se_proto, "unix") == 0) { 1484 sep->se_family = AF_LOCAL; 1485 } else { 1486 val = strlen(sep->se_proto); 1487 if (!val) { 1488 syslog(LOG_ERR, "%s: invalid protocol specified", 1489 sep->se_service); 1490 goto more; 1491 } 1492 val = sep->se_proto[val - 1]; 1493 switch (val) { 1494 case '4': /*tcp4 or udp4*/ 1495 sep->se_family = AF_INET; 1496 break; 1497 case '6': /*tcp6 or udp6*/ 1498 sep->se_family = AF_INET6; 1499 break; 1500 default: 1501 sep->se_family = AF_INET; /*will become AF_INET6*/ 1502 break; 1503 } 1504 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1505 #ifdef RPC 1506 char *cp, *ccp; 1507 cp = strchr(sep->se_service, '/'); 1508 if (cp == 0) { 1509 syslog(LOG_ERR, "%s: no rpc version", 1510 sep->se_service); 1511 goto more; 1512 } 1513 *cp++ = '\0'; 1514 sep->se_rpcversl = sep->se_rpcversh = 1515 strtol(cp, &ccp, 0); 1516 if (ccp == cp) { 1517 badafterall: 1518 syslog(LOG_ERR, "%s/%s: bad rpc version", 1519 sep->se_service, cp); 1520 goto more; 1521 } 1522 if (*ccp == '-') { 1523 cp = ccp + 1; 1524 sep->se_rpcversh = strtol(cp, &ccp, 0); 1525 if (ccp == cp) 1526 goto badafterall; 1527 } 1528 #else 1529 syslog(LOG_ERR, "%s: rpc services not suported", 1530 sep->se_service); 1531 goto more; 1532 #endif /* RPC */ 1533 } 1534 } 1535 arg = sskip(&cp); 1536 { 1537 char *cp; 1538 cp = strchr(arg, '.'); 1539 if (cp) { 1540 *cp++ = '\0'; 1541 sep->se_max = atoi(cp); 1542 } else 1543 sep->se_max = TOOMANY; 1544 } 1545 sep->se_wait = strcmp(arg, "wait") == 0; 1546 if (ISMUX(sep)) { 1547 /* 1548 * Silently enforce "nowait" for TCPMUX services since 1549 * they don't have an assigned port to listen on. 1550 */ 1551 sep->se_wait = 0; 1552 1553 if (strncmp(sep->se_proto, "tcp", 3)) { 1554 syslog(LOG_ERR, 1555 "%s: bad protocol for tcpmux service %s", 1556 CONFIG, sep->se_service); 1557 goto more; 1558 } 1559 if (sep->se_socktype != SOCK_STREAM) { 1560 syslog(LOG_ERR, 1561 "%s: bad socket type for tcpmux service %s", 1562 CONFIG, sep->se_service); 1563 goto more; 1564 } 1565 } 1566 sep->se_user = newstr(sskip(&cp)); 1567 if ((sep->se_group = strchr(sep->se_user, '.'))) 1568 *sep->se_group++ = '\0'; 1569 sep->se_server = newstr(sskip(&cp)); 1570 if (strcmp(sep->se_server, "internal") == 0) { 1571 struct biltin *bi; 1572 1573 for (bi = biltins; bi->bi_service; bi++) 1574 if (bi->bi_socktype == sep->se_socktype && 1575 strcmp(bi->bi_service, sep->se_service) == 0) 1576 break; 1577 if (bi->bi_service == 0) { 1578 syslog(LOG_ERR, "internal service %s unknown", 1579 sep->se_service); 1580 goto more; 1581 } 1582 sep->se_bi = bi; 1583 sep->se_wait = bi->bi_wait; 1584 } else 1585 sep->se_bi = NULL; 1586 argc = 0; 1587 for (arg = skip(&cp); cp; arg = skip(&cp)) { 1588 #if MULOG 1589 char *colon; 1590 1591 if (argc == 0 && (colon = strrchr(arg, ':'))) { 1592 while (arg < colon) { 1593 int x; 1594 char *ccp; 1595 1596 switch (*arg++) { 1597 case 'l': 1598 x = 1; 1599 if (isdigit(*arg)) { 1600 x = strtol(arg, &ccp, 0); 1601 if (ccp == arg) 1602 break; 1603 arg = ccp; 1604 } 1605 sep->se_log &= ~MULOG_RFC931; 1606 sep->se_log |= x; 1607 break; 1608 case 'a': 1609 sep->se_log |= MULOG_RFC931; 1610 break; 1611 default: 1612 break; 1613 } 1614 } 1615 arg = colon + 1; 1616 } 1617 #endif 1618 if (argc < MAXARGV) 1619 sep->se_argv[argc++] = newstr(arg); 1620 } 1621 while (argc <= MAXARGV) 1622 sep->se_argv[argc++] = NULL; 1623 #ifdef IPSEC 1624 sep->se_policy = policy ? newstr(policy) : NULL; 1625 #endif 1626 return (sep); 1627 } 1628 1629 void 1630 freeconfig(cp) 1631 struct servtab *cp; 1632 { 1633 int i; 1634 1635 if (cp->se_hostaddr) 1636 free(cp->se_hostaddr); 1637 if (cp->se_service) 1638 free(cp->se_service); 1639 if (cp->se_proto) 1640 free(cp->se_proto); 1641 if (cp->se_user) 1642 free(cp->se_user); 1643 /* Note: se_group is part of the newstr'ed se_user */ 1644 if (cp->se_server) 1645 free(cp->se_server); 1646 for (i = 0; i < MAXARGV; i++) 1647 if (cp->se_argv[i]) 1648 free(cp->se_argv[i]); 1649 #ifdef IPSEC 1650 if (cp->se_policy) 1651 free(cp->se_policy); 1652 #endif 1653 } 1654 1655 1656 /* 1657 * Safe skip - if skip returns null, log a syntax error in the 1658 * configuration file and exit. 1659 */ 1660 char * 1661 sskip(cpp) 1662 char **cpp; 1663 { 1664 char *cp; 1665 1666 cp = skip(cpp); 1667 if (cp == NULL) { 1668 syslog(LOG_ERR, "%s: syntax error", CONFIG); 1669 exit(-1); 1670 } 1671 return (cp); 1672 } 1673 1674 char * 1675 skip(cpp) 1676 char **cpp; 1677 { 1678 char *cp = *cpp; 1679 char *start; 1680 1681 if (*cpp == NULL) 1682 return ((char *)0); 1683 1684 again: 1685 while (*cp == ' ' || *cp == '\t') 1686 cp++; 1687 if (*cp == '\0') { 1688 int c; 1689 1690 c = getc(fconfig); 1691 (void) ungetc(c, fconfig); 1692 if (c == ' ' || c == '\t') 1693 if ((cp = nextline(fconfig))) 1694 goto again; 1695 *cpp = (char *)0; 1696 return ((char *)0); 1697 } 1698 start = cp; 1699 while (*cp && *cp != ' ' && *cp != '\t') 1700 cp++; 1701 if (*cp != '\0') 1702 *cp++ = '\0'; 1703 *cpp = cp; 1704 return (start); 1705 } 1706 1707 char * 1708 nextline(fd) 1709 FILE *fd; 1710 { 1711 char *cp; 1712 1713 if (fgets(line, sizeof (line), fd) == NULL) 1714 return ((char *)0); 1715 cp = strchr(line, '\n'); 1716 if (cp) 1717 *cp = '\0'; 1718 return (line); 1719 } 1720 1721 char * 1722 newstr(cp) 1723 char *cp; 1724 { 1725 if ((cp = strdup(cp ? cp : ""))) 1726 return (cp); 1727 syslog(LOG_ERR, "strdup: %m"); 1728 exit(-1); 1729 } 1730 1731 void 1732 inetd_setproctitle(a, s) 1733 char *a; 1734 int s; 1735 { 1736 int size; 1737 char *cp; 1738 struct sockaddr_storage ss; 1739 char buf[80]; 1740 char hbuf[80]; 1741 1742 cp = Argv[0]; 1743 size = sizeof(ss); 1744 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) { 1745 getnameinfo((struct sockaddr *)&ss, ss.ss_len, 1746 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST); 1747 (void)snprintf(buf, sizeof buf, "-%s [%s]", a, hbuf); 1748 } else 1749 (void)snprintf(buf, sizeof buf, "-%s", a); 1750 strncpy(cp, buf, LastArg - cp); 1751 cp += strlen(cp); 1752 while (cp < LastArg) 1753 *cp++ = ' '; 1754 } 1755 1756 void 1757 bump_nofile() 1758 { 1759 #ifdef RLIMIT_NOFILE 1760 1761 #define FD_CHUNK 32 1762 1763 struct rlimit rl; 1764 1765 if (getrlimit(RLIMIT_NOFILE, &rl) < 0) { 1766 syslog(LOG_ERR, "getrlimit: %m"); 1767 return; 1768 } 1769 rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK); 1770 if (rl.rlim_cur <= rlim_ofile_cur) { 1771 syslog(LOG_ERR, 1772 "bump_nofile: cannot extend file limit, max = %d", 1773 (int)rl.rlim_cur); 1774 return; 1775 } 1776 1777 if (setrlimit(RLIMIT_NOFILE, &rl) < 0) { 1778 syslog(LOG_ERR, "setrlimit: %m"); 1779 return; 1780 } 1781 1782 rlim_ofile_cur = rl.rlim_cur; 1783 return; 1784 1785 #else 1786 syslog(LOG_ERR, "bump_nofile: cannot extend file limit"); 1787 return; 1788 #endif 1789 } 1790 1791 /* 1792 * Internet services provided internally by inetd: 1793 */ 1794 #define BUFSIZE 4096 1795 1796 /* ARGSUSED */ 1797 void 1798 echo_stream(s, sep) /* Echo service -- echo data back */ 1799 int s; 1800 struct servtab *sep; 1801 { 1802 char buffer[BUFSIZE]; 1803 int i; 1804 1805 inetd_setproctitle(sep->se_service, s); 1806 while ((i = read(s, buffer, sizeof(buffer))) > 0 && 1807 write(s, buffer, i) > 0) 1808 ; 1809 } 1810 1811 /* ARGSUSED */ 1812 void 1813 echo_dg(s, sep) /* Echo service -- echo data back */ 1814 int s; 1815 struct servtab *sep; 1816 { 1817 char buffer[BUFSIZE]; 1818 int i, size; 1819 struct sockaddr sa; 1820 1821 size = sizeof(sa); 1822 if ((i = recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size)) < 0) 1823 return; 1824 if (port_good_dg(&sa)) 1825 (void) sendto(s, buffer, i, 0, &sa, sizeof(sa)); 1826 } 1827 1828 /* ARGSUSED */ 1829 void 1830 discard_stream(s, sep) /* Discard service -- ignore data */ 1831 int s; 1832 struct servtab *sep; 1833 { 1834 char buffer[BUFSIZE]; 1835 1836 inetd_setproctitle(sep->se_service, s); 1837 while ((errno = 0, read(s, buffer, sizeof(buffer)) > 0) || 1838 errno == EINTR) 1839 ; 1840 } 1841 1842 /* ARGSUSED */ 1843 void 1844 discard_dg(s, sep) /* Discard service -- ignore data */ 1845 int s; 1846 struct servtab *sep; 1847 { 1848 char buffer[BUFSIZE]; 1849 1850 (void) read(s, buffer, sizeof(buffer)); 1851 } 1852 1853 #include <ctype.h> 1854 #define LINESIZ 72 1855 char ring[128]; 1856 char *endring; 1857 1858 void 1859 initring() 1860 { 1861 int i; 1862 1863 endring = ring; 1864 1865 for (i = 0; i <= 128; ++i) 1866 if (isprint(i)) 1867 *endring++ = i; 1868 } 1869 1870 /* ARGSUSED */ 1871 void 1872 chargen_stream(s, sep) /* Character generator */ 1873 int s; 1874 struct servtab *sep; 1875 { 1876 int len; 1877 char *rs, text[LINESIZ+2]; 1878 1879 inetd_setproctitle(sep->se_service, s); 1880 1881 if (!endring) { 1882 initring(); 1883 rs = ring; 1884 } 1885 1886 text[LINESIZ] = '\r'; 1887 text[LINESIZ + 1] = '\n'; 1888 for (rs = ring;;) { 1889 if ((len = endring - rs) >= LINESIZ) 1890 memmove(text, rs, LINESIZ); 1891 else { 1892 memmove(text, rs, len); 1893 memmove(text + len, ring, LINESIZ - len); 1894 } 1895 if (++rs == endring) 1896 rs = ring; 1897 if (write(s, text, sizeof(text)) != sizeof(text)) 1898 break; 1899 } 1900 } 1901 1902 /* ARGSUSED */ 1903 void 1904 chargen_dg(s, sep) /* Character generator */ 1905 int s; 1906 struct servtab *sep; 1907 { 1908 struct sockaddr sa; 1909 static char *rs; 1910 int len, size; 1911 char text[LINESIZ+2]; 1912 1913 if (endring == 0) { 1914 initring(); 1915 rs = ring; 1916 } 1917 1918 size = sizeof(sa); 1919 if (recvfrom(s, text, sizeof(text), 0, &sa, &size) < 0) 1920 return; 1921 1922 if (!port_good_dg(&sa)) 1923 return; 1924 1925 if ((len = endring - rs) >= LINESIZ) 1926 memmove(text, rs, LINESIZ); 1927 else { 1928 memmove(text, rs, len); 1929 memmove(text + len, ring, LINESIZ - len); 1930 } 1931 if (++rs == endring) 1932 rs = ring; 1933 text[LINESIZ] = '\r'; 1934 text[LINESIZ + 1] = '\n'; 1935 (void) sendto(s, text, sizeof(text), 0, &sa, sizeof(sa)); 1936 } 1937 1938 /* 1939 * Return a machine readable date and time, in the form of the 1940 * number of seconds since midnight, Jan 1, 1900. Since gettimeofday 1941 * returns the number of seconds since midnight, Jan 1, 1970, 1942 * we must add 2208988800 seconds to this figure to make up for 1943 * some seventy years Bell Labs was asleep. 1944 */ 1945 1946 long 1947 machtime() 1948 { 1949 struct timeval tv; 1950 1951 if (gettimeofday(&tv, (struct timezone *)0) < 0) { 1952 if (debug) 1953 fprintf(stderr, "Unable to get time of day\n"); 1954 return (0L); 1955 } 1956 #define OFFSET ((u_long)25567 * 24*60*60) 1957 return (htonl((long)(tv.tv_sec + OFFSET))); 1958 #undef OFFSET 1959 } 1960 1961 /* ARGSUSED */ 1962 void 1963 machtime_stream(s, sep) 1964 int s; 1965 struct servtab *sep; 1966 { 1967 long result; 1968 1969 result = machtime(); 1970 (void) write(s, (char *) &result, sizeof(result)); 1971 } 1972 1973 /* ARGSUSED */ 1974 void 1975 machtime_dg(s, sep) 1976 int s; 1977 struct servtab *sep; 1978 { 1979 long result; 1980 struct sockaddr sa; 1981 int size; 1982 1983 size = sizeof(sa); 1984 if (recvfrom(s, (char *)&result, sizeof(result), 0, &sa, &size) < 0) 1985 return; 1986 if (!port_good_dg(&sa)) 1987 return; 1988 result = machtime(); 1989 (void) sendto(s, (char *) &result, sizeof(result), 0, &sa, sizeof(sa)); 1990 } 1991 1992 /* ARGSUSED */ 1993 void 1994 daytime_stream(s, sep) /* Return human-readable time of day */ 1995 int s; 1996 struct servtab *sep; 1997 { 1998 char buffer[256]; 1999 time_t clock; 2000 int len; 2001 2002 clock = time((time_t *) 0); 2003 2004 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 2005 (void) write(s, buffer, len); 2006 } 2007 2008 /* ARGSUSED */ 2009 void 2010 daytime_dg(s, sep) /* Return human-readable time of day */ 2011 int s; 2012 struct servtab *sep; 2013 { 2014 char buffer[256]; 2015 time_t clock; 2016 struct sockaddr sa; 2017 int size, len; 2018 2019 clock = time((time_t *) 0); 2020 2021 size = sizeof(sa); 2022 if (recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size) < 0) 2023 return; 2024 if (!port_good_dg(&sa)) 2025 return; 2026 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 2027 (void) sendto(s, buffer, len, 0, &sa, sizeof(sa)); 2028 } 2029 2030 /* 2031 * print_service: 2032 * Dump relevant information to stderr 2033 */ 2034 void 2035 print_service(action, sep) 2036 char *action; 2037 struct servtab *sep; 2038 { 2039 if (isrpcservice(sep)) 2040 fprintf(stderr, 2041 "%s: %s rpcprog=%d, rpcvers = %d/%d, proto=%s, wait.max=%d.%d, user.group=%s.%s builtin=%lx server=%s" 2042 #ifdef IPSEC 2043 " policy=\"%s\"" 2044 #endif 2045 "\n", 2046 action, sep->se_service, 2047 sep->se_rpcprog, sep->se_rpcversh, sep->se_rpcversl, sep->se_proto, 2048 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 2049 (long)sep->se_bi, sep->se_server 2050 #ifdef IPSEC 2051 , (sep->se_policy ? sep->se_policy : "") 2052 #endif 2053 ); 2054 else 2055 fprintf(stderr, 2056 "%s: %s proto=%s, wait.max=%d.%d, user.group=%s.%s builtin=%lx server=%s" 2057 #ifdef IPSEC 2058 " policy=%s" 2059 #endif 2060 "\n", 2061 action, sep->se_service, sep->se_proto, 2062 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 2063 (long)sep->se_bi, sep->se_server 2064 #ifdef IPSEC 2065 , (sep->se_policy ? sep->se_policy : "") 2066 #endif 2067 ); 2068 } 2069 2070 void 2071 usage() 2072 { 2073 2074 #ifdef LIBWRAP 2075 (void)fprintf(stderr, "usage: %s [-dl] [conf]\n", __progname); 2076 #else 2077 (void)fprintf(stderr, "usage: %s [-d] [conf]\n", __progname); 2078 #endif 2079 exit(1); 2080 } 2081 2082 2083 /* 2084 * Based on TCPMUX.C by Mark K. Lottor November 1988 2085 * sri-nic::ps:<mkl>tcpmux.c 2086 */ 2087 2088 static int /* # of characters upto \r,\n or \0 */ 2089 getline(fd, buf, len) 2090 int fd; 2091 char *buf; 2092 int len; 2093 { 2094 int count = 0, n; 2095 2096 do { 2097 n = read(fd, buf, len-count); 2098 if (n == 0) 2099 return (count); 2100 if (n < 0) 2101 return (-1); 2102 while (--n >= 0) { 2103 if (*buf == '\r' || *buf == '\n' || *buf == '\0') 2104 return (count); 2105 count++; 2106 buf++; 2107 } 2108 } while (count < len); 2109 return (count); 2110 } 2111 2112 #define MAX_SERV_LEN (256+2) /* 2 bytes for \r\n */ 2113 2114 #define strwrite(fd, buf) (void) write(fd, buf, sizeof(buf)-1) 2115 2116 void 2117 tcpmux(ctrl, sep) 2118 int ctrl; 2119 struct servtab *sep; 2120 { 2121 char service[MAX_SERV_LEN+1]; 2122 int len; 2123 2124 /* Get requested service name */ 2125 if ((len = getline(ctrl, service, MAX_SERV_LEN)) < 0) { 2126 strwrite(ctrl, "-Error reading service name\r\n"); 2127 goto reject; 2128 } 2129 service[len] = '\0'; 2130 2131 if (debug) 2132 fprintf(stderr, "tcpmux: someone wants %s\n", service); 2133 2134 /* 2135 * Help is a required command, and lists available services, 2136 * one per line. 2137 */ 2138 if (!strcasecmp(service, "help")) { 2139 strwrite(ctrl, "+Available services:\r\n"); 2140 strwrite(ctrl, "help\r\n"); 2141 for (sep = servtab; sep; sep = sep->se_next) { 2142 if (!ISMUX(sep)) 2143 continue; 2144 (void)write(ctrl, sep->se_service, 2145 strlen(sep->se_service)); 2146 strwrite(ctrl, "\r\n"); 2147 } 2148 goto reject; 2149 } 2150 2151 /* Try matching a service in inetd.conf with the request */ 2152 for (sep = servtab; sep; sep = sep->se_next) { 2153 if (!ISMUX(sep)) 2154 continue; 2155 if (!strcasecmp(service, sep->se_service)) { 2156 if (ISMUXPLUS(sep)) 2157 strwrite(ctrl, "+Go\r\n"); 2158 run_service(ctrl, sep); 2159 return; 2160 } 2161 } 2162 strwrite(ctrl, "-Service not available\r\n"); 2163 reject: 2164 _exit(1); 2165 } 2166 2167 2168 #ifdef MULOG 2169 dolog(sep, ctrl) 2170 struct servtab *sep; 2171 int ctrl; 2172 { 2173 struct sockaddr_storage ss; 2174 struct sockaddr *sa = (struct sockaddr *)ss; 2175 struct sockaddr_in *sin = (struct sockaddr_in *)&ss; 2176 int len = sizeof(ss); 2177 struct hostent *hp; 2178 char *host, *dp, buf[BUFSIZ], *rfc931_name(); 2179 int connected = 1; 2180 2181 switch (sep->se_family) { 2182 case AF_INET: 2183 case AF_INET6: 2184 break; 2185 default; 2186 return; 2187 } 2188 2189 if (getpeername(ctrl, sa, &len) < 0) { 2190 if (errno != ENOTCONN) { 2191 syslog(LOG_ERR, "getpeername: %m"); 2192 return; 2193 } 2194 if (recvfrom(ctrl, buf, sizeof(buf), MSG_PEEK, sa, &len) < 0) { 2195 syslog(LOG_ERR, "recvfrom: %m"); 2196 return; 2197 } 2198 connected = 0; 2199 } 2200 switch (sa->sa_family) { 2201 case AF_INET: 2202 case AF_INET6: 2203 break; 2204 default; 2205 syslog(LOG_ERR, "unexpected address family %u", sa->sa_family); 2206 return; 2207 } 2208 2209 getnameinfo(sa, sa->sa_len, buf, sizeof(buf), NULL, 0, 0); 2210 host = buf; 2211 2212 switch (sep->se_log & ~MULOG_RFC931) { 2213 case 0: 2214 return; 2215 case 1: 2216 if (curdom == NULL || *curdom == '\0') 2217 break; 2218 dp = host + strlen(host) - strlen(curdom); 2219 if (dp < host) 2220 break; 2221 if (debug) 2222 fprintf(stderr, "check \"%s\" against curdom \"%s\"\n", 2223 host, curdom); 2224 if (strcasecmp(dp, curdom) == 0) 2225 return; 2226 break; 2227 case 2: 2228 default: 2229 break; 2230 } 2231 2232 openlog("", LOG_NOWAIT, MULOG); 2233 2234 if (connected && (sep->se_log & MULOG_RFC931)) 2235 syslog(LOG_INFO, "%s@%s wants %s", 2236 rfc931_name(sa, ctrl), host, sep->se_service); 2237 else 2238 syslog(LOG_INFO, "%s wants %s", 2239 host, sep->se_service); 2240 } 2241 2242 /* 2243 * From tcp_log by 2244 * Wietse Venema, Eindhoven University of Technology, The Netherlands. 2245 */ 2246 #if 0 2247 static char sccsid[] = "@(#) rfc931.c 1.3 92/08/31 22:54:46"; 2248 #endif 2249 2250 #include <setjmp.h> 2251 2252 #define RFC931_PORT 113 /* Semi-well-known port */ 2253 #define TIMEOUT 4 2254 #define TIMEOUT2 10 2255 2256 static jmp_buf timebuf; 2257 2258 /* timeout - handle timeouts */ 2259 2260 static void timeout(sig) 2261 int sig; 2262 { 2263 longjmp(timebuf, sig); 2264 } 2265 2266 /* rfc931_name - return remote user name */ 2267 2268 char * 2269 rfc931_name(there, ctrl) 2270 struct sockaddr *there; /* remote link information */ 2271 int ctrl; 2272 { 2273 struct sockaddr_storage here; /* local link information */ 2274 struct sockaddr_storage sin; /* for talking to RFC931 daemon */ 2275 int length; 2276 int s; 2277 unsigned remote; 2278 unsigned local; 2279 static char user[256]; /* XXX */ 2280 char buf[256]; 2281 char *cp; 2282 char *result = "USER_UNKNOWN"; 2283 int len; 2284 u_int16_t myport, hisport; 2285 2286 /* Find out local port number of our stdin. */ 2287 2288 length = sizeof(here); 2289 if (getsockname(ctrl, (struct sockaddr *) &here, &length) == -1) { 2290 syslog(LOG_ERR, "getsockname: %m"); 2291 return (result); 2292 } 2293 switch (here.ss_family) { 2294 case AF_INET: 2295 myport = ((struct sockaddr_in *)&here)->sin_port; 2296 break; 2297 case AF_INET6: 2298 myport = ((struct sockaddr_in6 *)&here)->sin6_port; 2299 break; 2300 } 2301 switch (there->sa_family) { 2302 case AF_INET: 2303 hisport = ((struct sockaddr_in *)sa)->sin_port; 2304 break; 2305 case AF_INET6: 2306 hisport = ((struct sockaddr_in6 *)sa)->sin6_port; 2307 break; 2308 } 2309 /* Set up timer so we won't get stuck. */ 2310 2311 if ((s = socket(here.ss_family, SOCK_STREAM, 0)) == -1) { 2312 syslog(LOG_ERR, "socket: %m"); 2313 return (result); 2314 } 2315 2316 sin = here; 2317 switch (sin.ss_family) { 2318 case AF_INET: 2319 ((struct sockaddr_in *)&sin)->sin_port = htons(0); 2320 break; 2321 case AF_INET6: 2322 ((struct sockaddr_in6 *)&sin)->sin6_port = htons(0); 2323 break; 2324 } 2325 if (bind(s, (struct sockaddr *) &sin, sin.ss_len) == -1) { 2326 syslog(LOG_ERR, "bind: %m"); 2327 return (result); 2328 } 2329 2330 signal(SIGALRM, timeout); 2331 if (setjmp(timebuf)) { 2332 close(s); /* not: fclose(fp) */ 2333 return (result); 2334 } 2335 alarm(TIMEOUT); 2336 2337 /* Connect to the RFC931 daemon. */ 2338 2339 memcpy(&sin, there, there->sa_len); 2340 switch (sin.ss_family) { 2341 case AF_INET: 2342 ((struct sockaddr_in *)&sin)->sin_port = htons(RFC931_PORT); 2343 break; 2344 case AF_INET6: 2345 ((struct sockaddr_in6 *)&sin)->sin6_port = htons(RFC931_PORT); 2346 break; 2347 } 2348 if (connect(s, (struct sockaddr *) &sin, sin.ss_len) == -1) { 2349 close(s); 2350 alarm(0); 2351 return (result); 2352 } 2353 2354 /* Query the RFC 931 server. Would 13-byte writes ever be broken up? */ 2355 (void)snprintf(buf, sizeof buf, "%u,%u\r\n", ntohs(hisport), 2356 ntohs(myport)); 2357 2358 2359 for (len = 0, cp = buf; len < strlen(buf); ) { 2360 int n; 2361 2362 if ((n = write(s, cp, strlen(buf) - len)) == -1) { 2363 close(s); 2364 alarm(0); 2365 return (result); 2366 } 2367 cp += n; 2368 len += n; 2369 } 2370 2371 /* Read response */ 2372 for (cp = buf; cp < buf + sizeof(buf) - 1; ) { 2373 char c; 2374 if (read(s, &c, 1) != 1) { 2375 close(s); 2376 alarm(0); 2377 return (result); 2378 } 2379 if (c == '\n') 2380 break; 2381 *cp++ = c; 2382 } 2383 *cp = '\0'; 2384 2385 if (sscanf(buf, "%u , %u : USERID :%*[^:]:%255s", &remote, &local, user) == 3 2386 && ntohs(hisport) == remote 2387 && ntohs(myport) == local) { 2388 2389 /* Strip trailing carriage return. */ 2390 if (cp = strchr(user, '\r')) 2391 *cp = 0; 2392 result = user; 2393 } 2394 2395 alarm(0); 2396 close(s); 2397 return (result); 2398 } 2399 #endif 2400 2401 /* 2402 * check if the port where send data to is one of the obvious ports 2403 * that are used for denial of service attacks like two echo ports 2404 * just echoing data between them 2405 */ 2406 int port_good_dg(struct sockaddr *sa) 2407 { 2408 struct sockaddr_in *sin; 2409 u_int16_t port; 2410 int i,bad; 2411 2412 bad=0; 2413 2414 sin=(struct sockaddr_in *)sa; 2415 port=ntohs(sin->sin_port); 2416 2417 for(i=0;bad_ports[i]!=0;i++) 2418 if (port==bad_ports[i]) { 2419 bad=1; 2420 break; 2421 } 2422 2423 if (bad) { 2424 syslog(LOG_WARNING,"Possible DoS attack from %s, Port %d", 2425 inet_ntoa(sin->sin_addr),port); 2426 return (0); 2427 } else 2428 return (1); 2429 } 2430 2431
Indexes created Thu Sep 25 16:09:42 GMT 2025