inetd.c revision 1.80
1 /* $NetBSD: inetd.c,v 1.80 2002/06/01 00:32:41 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 1.80 2002/06/01 00:32:41 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 #ifndef NO_RPC 211 #define RPC 212 #endif 213 214 #include <netinet/in.h> 215 #include <arpa/inet.h> 216 #ifdef RPC 217 #include <rpc/rpc.h> 218 #include <rpc/rpcb_clnt.h> 219 #include <netconfig.h> 220 #endif 221 222 #include <ctype.h> 223 #include <errno.h> 224 #include <fcntl.h> 225 #include <grp.h> 226 #include <netdb.h> 227 #include <pwd.h> 228 #include <signal.h> 229 #include <stdio.h> 230 #include <stdlib.h> 231 #include <string.h> 232 #include <syslog.h> 233 #include <unistd.h> 234 #include <util.h> 235 236 #include "pathnames.h" 237 238 #ifdef IPSEC 239 #include <netinet6/ipsec.h> 240 #ifndef IPSEC_POLICY_IPSEC /* no ipsec support on old ipsec */ 241 #undef IPSEC 242 #endif 243 #include "ipsec.h" 244 #endif 245 246 #ifdef LIBWRAP 247 # include <tcpd.h> 248 #ifndef LIBWRAP_ALLOW_FACILITY 249 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH 250 #endif 251 #ifndef LIBWRAP_ALLOW_SEVERITY 252 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO 253 #endif 254 #ifndef LIBWRAP_DENY_FACILITY 255 # define LIBWRAP_DENY_FACILITY LOG_AUTH 256 #endif 257 #ifndef LIBWRAP_DENY_SEVERITY 258 # define LIBWRAP_DENY_SEVERITY LOG_WARNING 259 #endif 260 int allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY; 261 int deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY; 262 #endif 263 264 #define TOOMANY 40 /* don't start more than TOOMANY */ 265 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */ 266 #define RETRYTIME (60*10) /* retry after bind or server fail */ 267 268 #define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM)) 269 270 int debug; 271 #ifdef LIBWRAP 272 int lflag; 273 #endif 274 int nsock, maxsock; 275 fd_set allsock; 276 int options; 277 int timingout; 278 struct servent *sp; 279 char *curdom; 280 const int niflags = NI_NUMERICHOST | NI_NUMERICSERV; 281 282 #ifndef OPEN_MAX 283 #define OPEN_MAX 64 284 #endif 285 286 /* Reserve some descriptors, 3 stdio + at least: 1 log, 1 conf. file */ 287 #define FD_MARGIN (8) 288 rlim_t rlim_ofile_cur = OPEN_MAX; 289 290 #ifdef RLIMIT_NOFILE 291 struct rlimit rlim_ofile; 292 #endif 293 294 struct servtab { 295 char *se_hostaddr; /* host address to listen on */ 296 char *se_service; /* name of service */ 297 int se_socktype; /* type of socket to use */ 298 int se_family; /* address family */ 299 char *se_proto; /* protocol used */ 300 int se_sndbuf; /* sndbuf size */ 301 int se_rcvbuf; /* rcvbuf size */ 302 int se_rpcprog; /* rpc program number */ 303 int se_rpcversl; /* rpc program lowest version */ 304 int se_rpcversh; /* rpc program highest version */ 305 #define isrpcservice(sep) ((sep)->se_rpcversl != 0) 306 pid_t se_wait; /* single threaded server */ 307 short se_checked; /* looked at during merge */ 308 char *se_user; /* user name to run as */ 309 char *se_group; /* group name to run as */ 310 struct biltin *se_bi; /* if built-in, description */ 311 char *se_server; /* server program */ 312 #define MAXARGV 20 313 char *se_argv[MAXARGV+1]; /* program arguments */ 314 #ifdef IPSEC 315 char *se_policy; /* IPsec poilcy string */ 316 #endif 317 int se_fd; /* open descriptor */ 318 int se_type; /* type */ 319 union { 320 struct sockaddr se_un_ctrladdr; 321 struct sockaddr_in se_un_ctrladdr_in; 322 struct sockaddr_in6 se_un_ctrladdr_in6; 323 struct sockaddr_un se_un_ctrladdr_un; 324 } se_un; /* bound address */ 325 #define se_ctrladdr se_un.se_un_ctrladdr 326 #define se_ctrladdr_in se_un.se_un_ctrladdr_in 327 #define se_ctrladdr_un se_un.se_un_ctrladdr_un 328 int se_ctrladdr_size; 329 int se_max; /* max # of instances of this service */ 330 int se_count; /* number started since se_time */ 331 struct timeval se_time; /* start of se_count */ 332 #ifdef MULOG 333 int se_log; 334 #define MULOG_RFC931 0x40000000 335 #endif 336 struct servtab *se_next; 337 } *servtab; 338 339 #define NORM_TYPE 0 340 #define MUX_TYPE 1 341 #define MUXPLUS_TYPE 2 342 #define FAITH_TYPE 3 343 #define ISMUX(sep) (((sep)->se_type == MUX_TYPE) || \ 344 ((sep)->se_type == MUXPLUS_TYPE)) 345 #define ISMUXPLUS(sep) ((sep)->se_type == MUXPLUS_TYPE) 346 347 348 void chargen_dg __P((int, struct servtab *)); 349 void chargen_stream __P((int, struct servtab *)); 350 void close_sep __P((struct servtab *)); 351 void config __P((int)); 352 void daytime_dg __P((int, struct servtab *)); 353 void daytime_stream __P((int, struct servtab *)); 354 void discard_dg __P((int, struct servtab *)); 355 void discard_stream __P((int, struct servtab *)); 356 void echo_dg __P((int, struct servtab *)); 357 void echo_stream __P((int, struct servtab *)); 358 void endconfig __P((void)); 359 struct servtab *enter __P((struct servtab *)); 360 void freeconfig __P((struct servtab *)); 361 struct servtab *getconfigent __P((void)); 362 void goaway __P((int)); 363 void machtime_dg __P((int, struct servtab *)); 364 void machtime_stream __P((int, struct servtab *)); 365 char *newstr __P((char *)); 366 char *nextline __P((FILE *)); 367 void print_service __P((char *, struct servtab *)); 368 void reapchild __P((int)); 369 void retry __P((int)); 370 void run_service __P((int, struct servtab *)); 371 int setconfig __P((void)); 372 void setup __P((struct servtab *)); 373 char *sskip __P((char **)); 374 char *skip __P((char **)); 375 void tcpmux __P((int, struct servtab *)); 376 void usage __P((void)); 377 void register_rpc __P((struct servtab *sep)); 378 void unregister_rpc __P((struct servtab *sep)); 379 void bump_nofile __P((void)); 380 void inetd_setproctitle __P((char *, int)); 381 void initring __P((void)); 382 uint32_t machtime __P((void)); 383 int port_good_dg __P((struct sockaddr *sa)); 384 static int getline __P((int, char *, int)); 385 int main __P((int, char *[])); 386 void spawn __P((struct servtab *, int)); 387 #ifdef MULOG 388 void dolog __P((struct servtab *, int)); 389 static void timeout __P((int)); 390 char *rfc931_name __P((struct sockaddr *, int)); 391 #endif 392 393 struct biltin { 394 char *bi_service; /* internally provided service name */ 395 int bi_socktype; /* type of socket supported */ 396 short bi_fork; /* 1 if should fork before call */ 397 short bi_wait; /* 1 if should wait for child */ 398 void (*bi_fn) __P((int, struct servtab *)); 399 /* function which performs it */ 400 } biltins[] = { 401 /* Echo received data */ 402 { "echo", SOCK_STREAM, 1, 0, echo_stream }, 403 { "echo", SOCK_DGRAM, 0, 0, echo_dg }, 404 405 /* Internet /dev/null */ 406 { "discard", SOCK_STREAM, 1, 0, discard_stream }, 407 { "discard", SOCK_DGRAM, 0, 0, discard_dg }, 408 409 /* Return 32 bit time since 1970 */ 410 { "time", SOCK_STREAM, 0, 0, machtime_stream }, 411 { "time", SOCK_DGRAM, 0, 0, machtime_dg }, 412 413 /* Return human-readable time */ 414 { "daytime", SOCK_STREAM, 0, 0, daytime_stream }, 415 { "daytime", SOCK_DGRAM, 0, 0, daytime_dg }, 416 417 /* Familiar character generator */ 418 { "chargen", SOCK_STREAM, 1, 0, chargen_stream }, 419 { "chargen", SOCK_DGRAM, 0, 0, chargen_dg }, 420 421 { "tcpmux", SOCK_STREAM, 1, 0, tcpmux }, 422 423 { NULL } 424 }; 425 426 /* list of "bad" ports. I.e. ports that are most obviously used for 427 * "cycling packets" denial of service attacks. See /etc/services. 428 * List must end with port number "0". 429 */ 430 431 u_int16_t bad_ports[] = { 7, 9, 13, 19, 37, 0 }; 432 433 434 #define NUMINT (sizeof(intab) / sizeof(struct inent)) 435 char *CONFIG = _PATH_INETDCONF; 436 437 int 438 main(argc, argv) 439 int argc; 440 char *argv[]; 441 { 442 struct servtab *sep, *nsep; 443 struct sigvec sv; 444 int ch; 445 446 while ((ch = getopt(argc, argv, 447 #ifdef LIBWRAP 448 "dl" 449 #else 450 "d" 451 #endif 452 )) != -1) 453 switch(ch) { 454 case 'd': 455 debug = 1; 456 options |= SO_DEBUG; 457 break; 458 #ifdef LIBWRAP 459 case 'l': 460 lflag = 1; 461 break; 462 #endif 463 case '?': 464 default: 465 usage(); 466 } 467 argc -= optind; 468 argv += optind; 469 470 if (argc > 0) 471 CONFIG = argv[0]; 472 473 if (debug == 0) 474 daemon(0, 0); 475 openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON); 476 pidfile(NULL); 477 478 #ifdef RLIMIT_NOFILE 479 if (getrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) { 480 syslog(LOG_ERR, "getrlimit: %m"); 481 } else { 482 rlim_ofile_cur = rlim_ofile.rlim_cur; 483 if (rlim_ofile_cur == RLIM_INFINITY) /* ! */ 484 rlim_ofile_cur = OPEN_MAX; 485 } 486 #endif 487 488 memset(&sv, 0, sizeof(sv)); 489 sv.sv_mask = SIGBLOCK; 490 sv.sv_handler = retry; 491 sigvec(SIGALRM, &sv, (struct sigvec *)0); 492 config(SIGHUP); 493 sv.sv_handler = config; 494 sigvec(SIGHUP, &sv, (struct sigvec *)0); 495 sv.sv_handler = reapchild; 496 sigvec(SIGCHLD, &sv, (struct sigvec *)0); 497 sv.sv_handler = goaway; 498 sigvec(SIGTERM, &sv, (struct sigvec *)0); 499 sv.sv_handler = goaway; 500 sigvec(SIGINT, &sv, (struct sigvec *)0); 501 sv.sv_mask = 0L; 502 sv.sv_handler = SIG_IGN; 503 sigvec(SIGPIPE, &sv, (struct sigvec *)0); 504 505 { 506 /* space for daemons to overwrite environment for ps */ 507 #define DUMMYSIZE 100 508 char dummy[DUMMYSIZE]; 509 510 (void)memset(dummy, 'x', DUMMYSIZE - 1); 511 dummy[DUMMYSIZE - 1] = '\0'; 512 513 (void)setenv("inetd_dummy", dummy, 1); 514 } 515 516 for (;;) { 517 int n, ctrl; 518 fd_set readable; 519 520 if (nsock == 0) { 521 (void) sigblock(SIGBLOCK); 522 while (nsock == 0) 523 sigpause(0L); 524 (void) sigsetmask(0L); 525 } 526 readable = allsock; 527 if ((n = select(maxsock + 1, &readable, (fd_set *)0, 528 (fd_set *)0, (struct timeval *)0)) <= 0) { 529 if (n == -1 && errno != EINTR) { 530 syslog(LOG_WARNING, "select: %m"); 531 sleep(1); 532 } 533 continue; 534 } 535 for (sep = servtab; n && sep; sep = nsep) { 536 nsep = sep->se_next; 537 if (sep->se_fd == -1 || 538 !FD_ISSET(sep->se_fd, &readable)) 539 continue; 540 541 n--; 542 if (debug) 543 fprintf(stderr, "someone wants %s\n", sep->se_service); 544 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 545 /* XXX here do the libwrap check-before-accept */ 546 ctrl = accept(sep->se_fd, (struct sockaddr *)0, 547 (int *)0); 548 if (debug) 549 fprintf(stderr, "accept, ctrl %d\n", 550 ctrl); 551 if (ctrl < 0) { 552 if (errno != EINTR) 553 syslog(LOG_WARNING, 554 "accept (for %s): %m", 555 sep->se_service); 556 continue; 557 } 558 } else 559 ctrl = sep->se_fd; 560 (void) sigblock(SIGBLOCK); 561 spawn(sep, ctrl); 562 } 563 } 564 } 565 566 void 567 spawn(sep, ctrl) 568 struct servtab *sep; 569 int ctrl; 570 { 571 int dofork; 572 pid_t pid; 573 struct sigvec sv; 574 575 pid = 0; 576 #ifdef LIBWRAP_INTERNAL 577 dofork = 1; 578 #else 579 dofork = (sep->se_bi == 0 || sep->se_bi->bi_fork); 580 #endif 581 if (dofork) { 582 if (sep->se_count++ == 0) 583 (void)gettimeofday(&sep->se_time, (struct timezone *)0); 584 else if (sep->se_count >= sep->se_max) { 585 struct timeval now; 586 587 (void)gettimeofday(&now, (struct timezone *)0); 588 if (now.tv_sec - sep->se_time.tv_sec > CNT_INTVL) { 589 sep->se_time = now; 590 sep->se_count = 1; 591 } else { 592 syslog(LOG_ERR, 593 "%s/%s server failing (looping), service terminated\n", 594 sep->se_service, sep->se_proto); 595 if (!sep->se_wait && sep->se_socktype == 596 SOCK_STREAM) 597 close(ctrl); 598 close_sep(sep); 599 sigsetmask(0L); 600 if (!timingout) { 601 timingout = 1; 602 alarm(RETRYTIME); 603 } 604 return; 605 } 606 } 607 pid = fork(); 608 if (pid < 0) { 609 syslog(LOG_ERR, "fork: %m"); 610 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 611 close(ctrl); 612 sigsetmask(0L); 613 sleep(1); 614 return; 615 } 616 if (pid != 0 && sep->se_wait) { 617 sep->se_wait = pid; 618 FD_CLR(sep->se_fd, &allsock); 619 nsock--; 620 } 621 if (pid == 0) { 622 memset(&sv, 0, sizeof(sv)); 623 sv.sv_mask = 0L; 624 sv.sv_handler = SIG_DFL; 625 sigvec(SIGPIPE, &sv, (struct sigvec *)0); 626 if (debug) 627 setsid(); 628 } 629 } 630 sigsetmask(0L); 631 if (pid == 0) { 632 run_service(ctrl, sep); 633 if (dofork) 634 exit(0); 635 } 636 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 637 close(ctrl); 638 } 639 640 void 641 run_service(ctrl, sep) 642 int ctrl; 643 struct servtab *sep; 644 { 645 struct passwd *pwd; 646 struct group *grp = NULL; /* XXX gcc */ 647 char buf[NI_MAXSERV]; 648 #ifdef LIBWRAP 649 struct request_info req; 650 int denied; 651 char *service = NULL; /* XXX gcc */ 652 #endif 653 654 #ifdef LIBWRAP 655 #ifndef LIBWRAP_INTERNAL 656 if (sep->se_bi == 0) 657 #endif 658 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 659 request_init(&req, RQ_DAEMON, sep->se_argv[0] ? 660 sep->se_argv[0] : sep->se_service, RQ_FILE, ctrl, NULL); 661 fromhost(&req); 662 denied = !hosts_access(&req); 663 if (denied || lflag) { 664 if (getnameinfo(&sep->se_ctrladdr, 665 sep->se_ctrladdr.sa_len, NULL, 0, 666 buf, sizeof(buf), 0) != 0) { 667 /* shouldn't happen */ 668 (void)snprintf(buf, sizeof buf, "%d", 669 ntohs(sep->se_ctrladdr_in.sin_port)); 670 } 671 service = buf; 672 } 673 if (denied) { 674 syslog(deny_severity, 675 "refused connection from %.500s, service %s (%s)", 676 eval_client(&req), service, sep->se_proto); 677 goto reject; 678 } 679 if (lflag) { 680 syslog(allow_severity, 681 "connection from %.500s, service %s (%s)", 682 eval_client(&req), service, sep->se_proto); 683 } 684 } 685 #endif /* LIBWRAP */ 686 687 if (sep->se_bi) { 688 (*sep->se_bi->bi_fn)(ctrl, sep); 689 } else { 690 if ((pwd = getpwnam(sep->se_user)) == NULL) { 691 syslog(LOG_ERR, "%s/%s: %s: No such user", 692 sep->se_service, sep->se_proto, sep->se_user); 693 goto reject; 694 } 695 if (sep->se_group && 696 (grp = getgrnam(sep->se_group)) == NULL) { 697 syslog(LOG_ERR, "%s/%s: %s: No such group", 698 sep->se_service, sep->se_proto, sep->se_group); 699 goto reject; 700 } 701 if (pwd->pw_uid) { 702 if (sep->se_group) 703 pwd->pw_gid = grp->gr_gid; 704 if (setgid(pwd->pw_gid) < 0) { 705 syslog(LOG_ERR, 706 "%s/%s: can't set gid %d: %m", sep->se_service, 707 sep->se_proto, pwd->pw_gid); 708 goto reject; 709 } 710 (void) initgroups(pwd->pw_name, 711 pwd->pw_gid); 712 if (setuid(pwd->pw_uid) < 0) { 713 syslog(LOG_ERR, 714 "%s/%s: can't set uid %d: %m", sep->se_service, 715 sep->se_proto, pwd->pw_uid); 716 goto reject; 717 } 718 } else if (sep->se_group) { 719 (void) setgid((gid_t)grp->gr_gid); 720 } 721 if (debug) 722 fprintf(stderr, "%d execl %s\n", 723 getpid(), sep->se_server); 724 #ifdef MULOG 725 if (sep->se_log) 726 dolog(sep, ctrl); 727 #endif 728 /* Set our control descriptor to not close-on-exec... */ 729 if (fcntl(ctrl, F_SETFD, 0) < 0) 730 syslog(LOG_ERR, "fcntl (F_SETFD, 0): %m"); 731 /* ...and dup it to stdin, stdout, and stderr. */ 732 if (ctrl != 0) { 733 dup2(ctrl, 0); 734 close(ctrl); 735 ctrl = 0; 736 } 737 dup2(0, 1); 738 dup2(0, 2); 739 #ifdef RLIMIT_NOFILE 740 if (rlim_ofile.rlim_cur != rlim_ofile_cur && 741 setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) 742 syslog(LOG_ERR, "setrlimit: %m"); 743 #endif 744 execv(sep->se_server, sep->se_argv); 745 syslog(LOG_ERR, "cannot execute %s: %m", sep->se_server); 746 reject: 747 if (sep->se_socktype != SOCK_STREAM) 748 recv(ctrl, buf, sizeof (buf), 0); 749 _exit(1); 750 } 751 } 752 753 void 754 reapchild(signo) 755 int signo; 756 { 757 int status; 758 pid_t pid; 759 struct servtab *sep; 760 761 for (;;) { 762 pid = wait3(&status, WNOHANG, (struct rusage *)0); 763 if (pid <= 0) 764 break; 765 if (debug) 766 fprintf(stderr, "%d reaped, status %#x\n", 767 pid, status); 768 for (sep = servtab; sep; sep = sep->se_next) 769 if (sep->se_wait == pid) { 770 if (WIFEXITED(status) && WEXITSTATUS(status)) 771 syslog(LOG_WARNING, 772 "%s: exit status 0x%x", 773 sep->se_server, WEXITSTATUS(status)); 774 else if (WIFSIGNALED(status)) 775 syslog(LOG_WARNING, 776 "%s: exit signal 0x%x", 777 sep->se_server, WTERMSIG(status)); 778 sep->se_wait = 1; 779 FD_SET(sep->se_fd, &allsock); 780 nsock++; 781 if (debug) 782 fprintf(stderr, "restored %s, fd %d\n", 783 sep->se_service, sep->se_fd); 784 } 785 } 786 } 787 788 void 789 config(signo) 790 int signo; 791 { 792 struct servtab *sep, *cp, **sepp; 793 long omask; 794 int n; 795 796 if (!setconfig()) { 797 syslog(LOG_ERR, "%s: %m", CONFIG); 798 return; 799 } 800 for (sep = servtab; sep; sep = sep->se_next) 801 sep->se_checked = 0; 802 while ((cp = getconfigent())) { 803 for (sep = servtab; sep; sep = sep->se_next) 804 if (strcmp(sep->se_service, cp->se_service) == 0 && 805 strcmp(sep->se_hostaddr, cp->se_hostaddr) == 0 && 806 strcmp(sep->se_proto, cp->se_proto) == 0 && 807 ISMUX(sep) == ISMUX(cp)) 808 break; 809 if (sep != 0) { 810 int i; 811 812 #define SWAP(type, a, b) {type c=(type)a; (type)a=(type)b; (type)b=(type)c;} 813 814 omask = sigblock(SIGBLOCK); 815 /* 816 * sep->se_wait may be holding the pid of a daemon 817 * that we're waiting for. If so, don't overwrite 818 * it unless the config file explicitly says don't 819 * wait. 820 */ 821 if (cp->se_bi == 0 && 822 (sep->se_wait == 1 || cp->se_wait == 0)) 823 sep->se_wait = cp->se_wait; 824 SWAP(char *, sep->se_user, cp->se_user); 825 SWAP(char *, sep->se_group, cp->se_group); 826 SWAP(char *, sep->se_server, cp->se_server); 827 for (i = 0; i < MAXARGV; i++) 828 SWAP(char *, sep->se_argv[i], cp->se_argv[i]); 829 #ifdef IPSEC 830 SWAP(char *, sep->se_policy, cp->se_policy); 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 #ifdef INET6 873 case AF_INET6: 874 #endif 875 { 876 struct addrinfo hints, *res; 877 char *host, *port; 878 int error; 879 int s; 880 881 /* check if the family is supported */ 882 s = socket(sep->se_family, SOCK_DGRAM, 0); 883 if (s < 0) { 884 syslog(LOG_WARNING, 885 "%s/%s: %s: the address family is not supported by the kernel", 886 sep->se_service, sep->se_proto, 887 sep->se_hostaddr); 888 sep->se_checked = 0; 889 continue; 890 } 891 close(s); 892 893 memset(&hints, 0, sizeof(hints)); 894 hints.ai_family = sep->se_family; 895 hints.ai_socktype = sep->se_socktype; 896 hints.ai_flags = AI_PASSIVE; 897 if (!strcmp(sep->se_hostaddr, "*")) 898 host = NULL; 899 else 900 host = sep->se_hostaddr; 901 if (isrpcservice(sep) || ISMUX(sep)) 902 port = "0"; 903 else 904 port = sep->se_service; 905 error = getaddrinfo(host, port, &hints, &res); 906 if (error) { 907 if (error == EAI_SERVICE) { 908 /* gai_strerror not friendly enough */ 909 syslog(LOG_WARNING, "%s/%s: " 910 "unknown service", 911 sep->se_service, sep->se_proto); 912 } else { 913 syslog(LOG_ERR, "%s/%s: %s: %s", 914 sep->se_service, sep->se_proto, 915 sep->se_hostaddr, 916 gai_strerror(error)); 917 } 918 sep->se_checked = 0; 919 continue; 920 } 921 if (res->ai_next) { 922 syslog(LOG_ERR, 923 "%s/%s: %s: resolved to multiple addr", 924 sep->se_service, sep->se_proto, 925 sep->se_hostaddr); 926 sep->se_checked = 0; 927 freeaddrinfo(res); 928 continue; 929 } 930 memcpy(&sep->se_ctrladdr, res->ai_addr, 931 res->ai_addrlen); 932 if (ISMUX(sep)) { 933 sep->se_fd = -1; 934 freeaddrinfo(res); 935 continue; 936 } 937 sep->se_ctrladdr_size = res->ai_addrlen; 938 freeaddrinfo(res); 939 #ifdef RPC 940 if (isrpcservice(sep)) { 941 struct rpcent *rp; 942 943 sep->se_rpcprog = atoi(sep->se_service); 944 if (sep->se_rpcprog == 0) { 945 rp = getrpcbyname(sep->se_service); 946 if (rp == 0) { 947 syslog(LOG_ERR, 948 "%s/%s: unknown service", 949 sep->se_service, 950 sep->se_proto); 951 sep->se_checked = 0; 952 continue; 953 } 954 sep->se_rpcprog = rp->r_number; 955 } 956 if (sep->se_fd == -1 && !ISMUX(sep)) 957 setup(sep); 958 if (sep->se_fd != -1) 959 register_rpc(sep); 960 } else 961 #endif 962 { 963 if (sep->se_fd >= 0) 964 close_sep(sep); 965 if (sep->se_fd == -1 && !ISMUX(sep)) 966 setup(sep); 967 } 968 } 969 } 970 } 971 endconfig(); 972 /* 973 * Purge anything not looked at above. 974 */ 975 omask = sigblock(SIGBLOCK); 976 sepp = &servtab; 977 while ((sep = *sepp)) { 978 if (sep->se_checked) { 979 sepp = &sep->se_next; 980 continue; 981 } 982 *sepp = sep->se_next; 983 if (sep->se_fd >= 0) 984 close_sep(sep); 985 if (isrpcservice(sep)) 986 unregister_rpc(sep); 987 if (sep->se_family == AF_LOCAL) 988 (void)unlink(sep->se_service); 989 if (debug) 990 print_service("FREE", sep); 991 freeconfig(sep); 992 free((char *)sep); 993 } 994 (void) sigsetmask(omask); 995 } 996 997 void 998 retry(signo) 999 int signo; 1000 { 1001 struct servtab *sep; 1002 1003 timingout = 0; 1004 for (sep = servtab; sep; sep = sep->se_next) { 1005 if (sep->se_fd == -1 && !ISMUX(sep)) { 1006 switch (sep->se_family) { 1007 case AF_LOCAL: 1008 case AF_INET: 1009 #ifdef INET6 1010 case AF_INET6: 1011 #endif 1012 setup(sep); 1013 if (sep->se_fd != -1 && isrpcservice(sep)) 1014 register_rpc(sep); 1015 break; 1016 } 1017 } 1018 } 1019 } 1020 1021 void 1022 goaway(signo) 1023 int signo; 1024 { 1025 struct servtab *sep; 1026 1027 for (sep = servtab; sep; sep = sep->se_next) { 1028 if (sep->se_fd == -1) 1029 continue; 1030 1031 switch (sep->se_family) { 1032 case AF_LOCAL: 1033 (void)unlink(sep->se_service); 1034 break; 1035 case AF_INET: 1036 #ifdef INET6 1037 case AF_INET6: 1038 #endif 1039 if (sep->se_wait == 1 && isrpcservice(sep)) 1040 unregister_rpc(sep); 1041 break; 1042 } 1043 (void)close(sep->se_fd); 1044 } 1045 exit(0); 1046 } 1047 1048 void 1049 setup(sep) 1050 struct servtab *sep; 1051 { 1052 int on = 1; 1053 1054 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) { 1055 if (debug) 1056 fprintf(stderr, "socket failed on %s/%s: %s\n", 1057 sep->se_service, sep->se_proto, strerror(errno)); 1058 syslog(LOG_ERR, "%s/%s: socket: %m", 1059 sep->se_service, sep->se_proto); 1060 return; 1061 } 1062 /* Set all listening sockets to close-on-exec. */ 1063 if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) 1064 syslog(LOG_ERR, "fcntl (F_SETFD, FD_CLOEXEC): %m"); 1065 1066 #define turnon(fd, opt) \ 1067 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 1068 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 1069 turnon(sep->se_fd, SO_DEBUG) < 0) 1070 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 1071 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 1072 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 1073 #undef turnon 1074 1075 /* Set the socket buffer sizes, if specified. */ 1076 if (sep->se_sndbuf != 0 && setsockopt(sep->se_fd, SOL_SOCKET, 1077 SO_SNDBUF, (char *)&sep->se_sndbuf, sizeof(sep->se_sndbuf)) < 0) 1078 syslog(LOG_ERR, "setsockopt (SO_SNDBUF %d): %m", 1079 sep->se_sndbuf); 1080 if (sep->se_rcvbuf != 0 && setsockopt(sep->se_fd, SOL_SOCKET, 1081 SO_RCVBUF, (char *)&sep->se_rcvbuf, sizeof(sep->se_rcvbuf)) < 0) 1082 syslog(LOG_ERR, "setsockopt (SO_RCVBUF %d): %m", 1083 sep->se_rcvbuf); 1084 if (sep->se_type == FAITH_TYPE && setsockopt(sep->se_fd, IPPROTO_IPV6, 1085 IPV6_FAITH, (char *)&on, sizeof(on)) < 0) 1086 syslog(LOG_ERR, "setsockopt (IPV6_FAITH): %m"); 1087 #ifdef IPSEC 1088 if (ipsecsetup(sep->se_family, sep->se_fd, sep->se_policy) < 0 && 1089 sep->se_policy) { 1090 syslog(LOG_ERR, "%s/%s: ipsec setup failed", 1091 sep->se_service, sep->se_proto); 1092 (void)close(sep->se_fd); 1093 sep->se_fd = -1; 1094 return; 1095 } 1096 #endif 1097 1098 if (bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size) < 0) { 1099 if (debug) 1100 fprintf(stderr, "bind failed on %s/%s: %s\n", 1101 sep->se_service, sep->se_proto, strerror(errno)); 1102 syslog(LOG_ERR, "%s/%s: bind: %m", 1103 sep->se_service, sep->se_proto); 1104 (void) close(sep->se_fd); 1105 sep->se_fd = -1; 1106 if (!timingout) { 1107 timingout = 1; 1108 alarm(RETRYTIME); 1109 } 1110 return; 1111 } 1112 if (sep->se_socktype == SOCK_STREAM) 1113 listen(sep->se_fd, 10); 1114 1115 FD_SET(sep->se_fd, &allsock); 1116 nsock++; 1117 if (sep->se_fd > maxsock) { 1118 maxsock = sep->se_fd; 1119 if (maxsock > rlim_ofile_cur - FD_MARGIN) 1120 bump_nofile(); 1121 } 1122 if (debug) 1123 fprintf(stderr, "registered %s on %d\n", 1124 sep->se_server, sep->se_fd); 1125 } 1126 1127 /* 1128 * Finish with a service and its socket. 1129 */ 1130 void 1131 close_sep(sep) 1132 struct servtab *sep; 1133 { 1134 if (sep->se_fd >= 0) { 1135 nsock--; 1136 FD_CLR(sep->se_fd, &allsock); 1137 (void) close(sep->se_fd); 1138 sep->se_fd = -1; 1139 } 1140 sep->se_count = 0; 1141 /* 1142 * Don't keep the pid of this running daemon: when reapchild() 1143 * reaps this pid, it would erroneously increment nsock. 1144 */ 1145 if (sep->se_wait > 1) 1146 sep->se_wait = 1; 1147 } 1148 1149 void 1150 register_rpc(sep) 1151 struct servtab *sep; 1152 { 1153 #ifdef RPC 1154 int n; 1155 struct netbuf nbuf; 1156 struct sockaddr_storage ss; 1157 struct netconfig *nconf; 1158 1159 if ((nconf = getnetconfigent(sep->se_proto+4)) == NULL) { 1160 syslog(LOG_ERR, "%s: getnetconfigent failed", 1161 sep->se_proto); 1162 return; 1163 } 1164 n = sizeof ss; 1165 if (getsockname(sep->se_fd, (struct sockaddr *)&ss, &n) < 0) { 1166 syslog(LOG_ERR, "%s/%s: getsockname: %m", 1167 sep->se_service, sep->se_proto); 1168 return; 1169 } 1170 1171 nbuf.buf = &ss; 1172 nbuf.len = ss.ss_len; 1173 nbuf.maxlen = sizeof (struct sockaddr_storage); 1174 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1175 if (debug) 1176 fprintf(stderr, "rpcb_set: %u %d %s %s\n", 1177 sep->se_rpcprog, n, nconf->nc_netid, 1178 taddr2uaddr(nconf, &nbuf)); 1179 (void)rpcb_unset(sep->se_rpcprog, n, nconf); 1180 if (!rpcb_set(sep->se_rpcprog, n, nconf, &nbuf)) 1181 syslog(LOG_ERR, "rpcb_set: %u %d %s %s%s", 1182 sep->se_rpcprog, n, nconf->nc_netid, 1183 taddr2uaddr(nconf, &nbuf), clnt_spcreateerror("")); 1184 } 1185 #endif /* RPC */ 1186 } 1187 1188 void 1189 unregister_rpc(sep) 1190 struct servtab *sep; 1191 { 1192 #ifdef RPC 1193 int n; 1194 struct netconfig *nconf; 1195 1196 if ((nconf = getnetconfigent(sep->se_proto+4)) == NULL) { 1197 syslog(LOG_ERR, "%s: getnetconfigent failed", 1198 sep->se_proto); 1199 return; 1200 } 1201 1202 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1203 if (debug) 1204 fprintf(stderr, "rpcb_unset(%u, %d, %s)\n", 1205 sep->se_rpcprog, n, nconf->nc_netid); 1206 if (!rpcb_unset(sep->se_rpcprog, n, nconf)) 1207 syslog(LOG_ERR, "rpcb_unset(%u, %d, %s) failed\n", 1208 sep->se_rpcprog, n, nconf->nc_netid); 1209 } 1210 #endif /* RPC */ 1211 } 1212 1213 1214 struct servtab * 1215 enter(cp) 1216 struct servtab *cp; 1217 { 1218 struct servtab *sep; 1219 long omask; 1220 1221 sep = (struct servtab *)malloc(sizeof (*sep)); 1222 if (sep == (struct servtab *)0) { 1223 syslog(LOG_ERR, "Out of memory."); 1224 exit(1); 1225 } 1226 *sep = *cp; 1227 sep->se_fd = -1; 1228 sep->se_rpcprog = -1; 1229 omask = sigblock(SIGBLOCK); 1230 sep->se_next = servtab; 1231 servtab = sep; 1232 sigsetmask(omask); 1233 return (sep); 1234 } 1235 1236 FILE *fconfig = NULL; 1237 struct servtab serv; 1238 char line[LINE_MAX]; 1239 char *defhost; 1240 #ifdef IPSEC 1241 static char *policy = NULL; 1242 #endif 1243 1244 int 1245 setconfig() 1246 { 1247 if (defhost) 1248 free(defhost); 1249 defhost = newstr("*"); 1250 #ifdef IPSEC 1251 if (policy) 1252 free(policy); 1253 policy = NULL; 1254 #endif 1255 if (fconfig != NULL) { 1256 fseek(fconfig, 0L, SEEK_SET); 1257 return (1); 1258 } 1259 fconfig = fopen(CONFIG, "r"); 1260 return (fconfig != NULL); 1261 } 1262 1263 void 1264 endconfig() 1265 { 1266 if (fconfig) { 1267 (void) fclose(fconfig); 1268 fconfig = NULL; 1269 } 1270 if (defhost) { 1271 free(defhost); 1272 defhost = 0; 1273 } 1274 } 1275 1276 struct servtab * 1277 getconfigent() 1278 { 1279 struct servtab *sep = &serv; 1280 int argc, val; 1281 char *cp, *cp0, *arg, *buf0, *buf1, *sz0, *sz1; 1282 static char TCPMUX_TOKEN[] = "tcpmux/"; 1283 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) 1284 char *hostdelim; 1285 1286 more: 1287 while ((cp = nextline(fconfig))) { 1288 #ifdef IPSEC 1289 /* lines starting with #@ is not a comment, but the policy */ 1290 if (cp[0] == '#' && cp[1] == '@') { 1291 char *p; 1292 for (p = cp + 2; p && *p && isspace(*p); p++) 1293 ; 1294 if (*p == '\0') { 1295 if (policy) 1296 free(policy); 1297 policy = NULL; 1298 } else { 1299 if (ipsecsetup_test(p) < 0) { 1300 syslog(LOG_ERR, 1301 "%s: invalid ipsec policy \"%s\"", 1302 CONFIG, p); 1303 exit(1); 1304 } else { 1305 if (policy) 1306 free(policy); 1307 policy = newstr(p); 1308 } 1309 } 1310 } 1311 #endif 1312 if (*cp == '#' || *cp == '\0') 1313 continue; 1314 #ifdef MULOG 1315 /* Avoid use of `skip' if there is a danger of it looking 1316 * at continuation lines. 1317 */ 1318 do { 1319 cp++; 1320 } while (*cp == ' ' || *cp == '\t'); 1321 if (*cp == '\0') 1322 continue; 1323 if ((arg = skip(&cp)) == NULL) 1324 continue; 1325 if (strcmp(arg, "DOMAIN")) 1326 continue; 1327 if (curdom) 1328 free(curdom); 1329 curdom = NULL; 1330 while (*cp == ' ' || *cp == '\t') 1331 cp++; 1332 if (*cp == '\0') 1333 continue; 1334 arg = cp; 1335 while (*cp && *cp != ' ' && *cp != '\t') 1336 cp++; 1337 if (*cp != '\0') 1338 *cp++ = '\0'; 1339 curdom = newstr(arg); 1340 #endif 1341 break; 1342 } 1343 if (cp == NULL) 1344 return ((struct servtab *)0); 1345 /* 1346 * clear the static buffer, since some fields (se_ctrladdr, 1347 * for example) don't get initialized here. 1348 */ 1349 memset((caddr_t)sep, 0, sizeof *sep); 1350 arg = skip(&cp); 1351 if (cp == NULL) { 1352 /* got an empty line containing just blanks/tabs. */ 1353 goto more; 1354 } 1355 /* Check for a host name. */ 1356 hostdelim = strrchr(arg, ':'); 1357 if (hostdelim) { 1358 *hostdelim = '\0'; 1359 if (arg[0] == '[' && hostdelim > arg && hostdelim[-1] == ']') { 1360 hostdelim[-1] = '\0'; 1361 sep->se_hostaddr = newstr(arg + 1); 1362 } else 1363 sep->se_hostaddr = newstr(arg); 1364 arg = hostdelim + 1; 1365 /* 1366 * If the line is of the form `host:', then just change the 1367 * default host for the following lines. 1368 */ 1369 if (*arg == '\0') { 1370 arg = skip(&cp); 1371 if (cp == NULL) { 1372 free(defhost); 1373 defhost = sep->se_hostaddr; 1374 goto more; 1375 } 1376 } 1377 } else 1378 sep->se_hostaddr = newstr(defhost); 1379 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1380 char *c = arg + MUX_LEN; 1381 if (*c == '+') { 1382 sep->se_type = MUXPLUS_TYPE; 1383 c++; 1384 } else 1385 sep->se_type = MUX_TYPE; 1386 sep->se_service = newstr(c); 1387 } else { 1388 sep->se_service = newstr(arg); 1389 sep->se_type = NORM_TYPE; 1390 } 1391 1392 arg = sskip(&cp); 1393 if (strcmp(arg, "stream") == 0) 1394 sep->se_socktype = SOCK_STREAM; 1395 else if (strcmp(arg, "dgram") == 0) 1396 sep->se_socktype = SOCK_DGRAM; 1397 else if (strcmp(arg, "rdm") == 0) 1398 sep->se_socktype = SOCK_RDM; 1399 else if (strcmp(arg, "seqpacket") == 0) 1400 sep->se_socktype = SOCK_SEQPACKET; 1401 else if (strcmp(arg, "raw") == 0) 1402 sep->se_socktype = SOCK_RAW; 1403 else 1404 sep->se_socktype = -1; 1405 1406 arg = sskip(&cp); 1407 if (sep->se_type == NORM_TYPE && 1408 strncmp(arg, "faith/", strlen("faith/")) == 0) { 1409 arg += strlen("faith/"); 1410 sep->se_type = FAITH_TYPE; 1411 } 1412 sep->se_proto = newstr(arg); 1413 1414 #define MALFORMED(arg) \ 1415 do { \ 1416 syslog(LOG_ERR, "%s: malformed buffer size option `%s'", \ 1417 sep->se_service, (arg)); \ 1418 goto more; \ 1419 } while (0) 1420 1421 #define GETVAL(arg) \ 1422 do { \ 1423 if (!isdigit(*(arg))) \ 1424 MALFORMED(arg); \ 1425 val = strtol((arg), &cp0, 10); \ 1426 if (cp0 != NULL) { \ 1427 if (cp0[1] != '\0') \ 1428 MALFORMED((arg)); \ 1429 if (cp0[0] == 'k') \ 1430 val *= 1024; \ 1431 if (cp0[0] == 'm') \ 1432 val *= 1024 * 1024; \ 1433 } \ 1434 if (val < 1) { \ 1435 syslog(LOG_ERR, "%s: invalid buffer size `%s'", \ 1436 sep->se_service, (arg)); \ 1437 goto more; \ 1438 } \ 1439 } while (0) 1440 1441 #define ASSIGN(arg) \ 1442 do { \ 1443 if (strcmp((arg), "sndbuf") == 0) \ 1444 sep->se_sndbuf = val; \ 1445 else if (strcmp((arg), "rcvbuf") == 0) \ 1446 sep->se_rcvbuf = val; \ 1447 else \ 1448 MALFORMED((arg)); \ 1449 } while (0) 1450 1451 /* 1452 * Extract the send and receive buffer sizes before parsing 1453 * the protocol. 1454 */ 1455 sep->se_sndbuf = sep->se_rcvbuf = 0; 1456 buf0 = buf1 = sz0 = sz1 = NULL; 1457 if ((buf0 = strchr(sep->se_proto, ',')) != NULL) { 1458 /* Not meaningful for Tcpmux services. */ 1459 if (ISMUX(sep)) { 1460 syslog(LOG_ERR, "%s: can't specify buffer sizes for " 1461 "tcpmux services", sep->se_service); 1462 goto more; 1463 } 1464 1465 /* Skip the , */ 1466 *buf0++ = '\0'; 1467 1468 /* Check to see if another socket buffer size was specified. */ 1469 if ((buf1 = strchr(buf0, ',')) != NULL) { 1470 /* Skip the , */ 1471 *buf1++ = '\0'; 1472 1473 /* Make sure a 3rd one wasn't specified. */ 1474 if (strchr(buf1, ',') != NULL) { 1475 syslog(LOG_ERR, "%s: too many buffer sizes", 1476 sep->se_service); 1477 goto more; 1478 } 1479 1480 /* Locate the size. */ 1481 if ((sz1 = strchr(buf1, '=')) == NULL) 1482 MALFORMED(buf1); 1483 1484 /* Skip the = */ 1485 *sz1++ = '\0'; 1486 } 1487 1488 /* Locate the size. */ 1489 if ((sz0 = strchr(buf0, '=')) == NULL) 1490 MALFORMED(buf0); 1491 1492 /* Skip the = */ 1493 *sz0++ = '\0'; 1494 1495 GETVAL(sz0); 1496 ASSIGN(buf0); 1497 1498 if (buf1 != NULL) { 1499 GETVAL(sz1); 1500 ASSIGN(buf1); 1501 } 1502 } 1503 1504 #undef ASSIGN 1505 #undef GETVAL 1506 #undef MALFORMED 1507 1508 if (strcmp(sep->se_proto, "unix") == 0) { 1509 sep->se_family = AF_LOCAL; 1510 } else { 1511 val = strlen(sep->se_proto); 1512 if (!val) { 1513 syslog(LOG_ERR, "%s: invalid protocol specified", 1514 sep->se_service); 1515 goto more; 1516 } 1517 val = sep->se_proto[val - 1]; 1518 switch (val) { 1519 case '4': /*tcp4 or udp4*/ 1520 sep->se_family = AF_INET; 1521 break; 1522 #ifdef INET6 1523 case '6': /*tcp6 or udp6*/ 1524 sep->se_family = AF_INET6; 1525 break; 1526 #endif 1527 default: 1528 sep->se_family = AF_INET; /*will become AF_INET6*/ 1529 break; 1530 } 1531 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1532 #ifdef RPC 1533 char *cp, *ccp; 1534 cp = strchr(sep->se_service, '/'); 1535 if (cp == 0) { 1536 syslog(LOG_ERR, "%s: no rpc version", 1537 sep->se_service); 1538 goto more; 1539 } 1540 *cp++ = '\0'; 1541 sep->se_rpcversl = sep->se_rpcversh = 1542 strtol(cp, &ccp, 0); 1543 if (ccp == cp) { 1544 badafterall: 1545 syslog(LOG_ERR, "%s/%s: bad rpc version", 1546 sep->se_service, cp); 1547 goto more; 1548 } 1549 if (*ccp == '-') { 1550 cp = ccp + 1; 1551 sep->se_rpcversh = strtol(cp, &ccp, 0); 1552 if (ccp == cp) 1553 goto badafterall; 1554 } 1555 #else 1556 syslog(LOG_ERR, "%s: rpc services not suported", 1557 sep->se_service); 1558 goto more; 1559 #endif /* RPC */ 1560 } 1561 } 1562 arg = sskip(&cp); 1563 { 1564 char *cp; 1565 if ((cp = strchr(arg, ':')) == NULL) 1566 cp = strchr(arg, '.'); 1567 if (cp != NULL) { 1568 *cp++ = '\0'; 1569 sep->se_max = atoi(cp); 1570 } else 1571 sep->se_max = TOOMANY; 1572 } 1573 sep->se_wait = strcmp(arg, "wait") == 0; 1574 if (ISMUX(sep)) { 1575 /* 1576 * Silently enforce "nowait" for TCPMUX services since 1577 * they don't have an assigned port to listen on. 1578 */ 1579 sep->se_wait = 0; 1580 1581 if (strncmp(sep->se_proto, "tcp", 3)) { 1582 syslog(LOG_ERR, 1583 "%s: bad protocol for tcpmux service %s", 1584 CONFIG, sep->se_service); 1585 goto more; 1586 } 1587 if (sep->se_socktype != SOCK_STREAM) { 1588 syslog(LOG_ERR, 1589 "%s: bad socket type for tcpmux service %s", 1590 CONFIG, sep->se_service); 1591 goto more; 1592 } 1593 } 1594 sep->se_user = newstr(sskip(&cp)); 1595 if ((sep->se_group = strchr(sep->se_user, ':')) != NULL) 1596 *sep->se_group++ = '\0'; 1597 else if ((sep->se_group = strchr(sep->se_user, '.')) != NULL) 1598 *sep->se_group++ = '\0'; 1599 1600 sep->se_server = newstr(sskip(&cp)); 1601 if (strcmp(sep->se_server, "internal") == 0) { 1602 struct biltin *bi; 1603 1604 for (bi = biltins; bi->bi_service; bi++) 1605 if (bi->bi_socktype == sep->se_socktype && 1606 strcmp(bi->bi_service, sep->se_service) == 0) 1607 break; 1608 if (bi->bi_service == 0) { 1609 syslog(LOG_ERR, "internal service %s unknown", 1610 sep->se_service); 1611 goto more; 1612 } 1613 sep->se_bi = bi; 1614 sep->se_wait = bi->bi_wait; 1615 } else 1616 sep->se_bi = NULL; 1617 argc = 0; 1618 for (arg = skip(&cp); cp; arg = skip(&cp)) { 1619 #if MULOG 1620 char *colon; 1621 1622 if (argc == 0 && (colon = strrchr(arg, ':'))) { 1623 while (arg < colon) { 1624 int x; 1625 char *ccp; 1626 1627 switch (*arg++) { 1628 case 'l': 1629 x = 1; 1630 if (isdigit(*arg)) { 1631 x = strtol(arg, &ccp, 0); 1632 if (ccp == arg) 1633 break; 1634 arg = ccp; 1635 } 1636 sep->se_log &= ~MULOG_RFC931; 1637 sep->se_log |= x; 1638 break; 1639 case 'a': 1640 sep->se_log |= MULOG_RFC931; 1641 break; 1642 default: 1643 break; 1644 } 1645 } 1646 arg = colon + 1; 1647 } 1648 #endif 1649 if (argc < MAXARGV) 1650 sep->se_argv[argc++] = newstr(arg); 1651 } 1652 while (argc <= MAXARGV) 1653 sep->se_argv[argc++] = NULL; 1654 #ifdef IPSEC 1655 sep->se_policy = policy ? newstr(policy) : NULL; 1656 #endif 1657 return (sep); 1658 } 1659 1660 void 1661 freeconfig(cp) 1662 struct servtab *cp; 1663 { 1664 int i; 1665 1666 if (cp->se_hostaddr) 1667 free(cp->se_hostaddr); 1668 if (cp->se_service) 1669 free(cp->se_service); 1670 if (cp->se_proto) 1671 free(cp->se_proto); 1672 if (cp->se_user) 1673 free(cp->se_user); 1674 /* Note: se_group is part of the newstr'ed se_user */ 1675 if (cp->se_server) 1676 free(cp->se_server); 1677 for (i = 0; i < MAXARGV; i++) 1678 if (cp->se_argv[i]) 1679 free(cp->se_argv[i]); 1680 #ifdef IPSEC 1681 if (cp->se_policy) 1682 free(cp->se_policy); 1683 #endif 1684 } 1685 1686 1687 /* 1688 * Safe skip - if skip returns null, log a syntax error in the 1689 * configuration file and exit. 1690 */ 1691 char * 1692 sskip(cpp) 1693 char **cpp; 1694 { 1695 char *cp; 1696 1697 cp = skip(cpp); 1698 if (cp == NULL) { 1699 syslog(LOG_ERR, "%s: syntax error", CONFIG); 1700 exit(1); 1701 } 1702 return (cp); 1703 } 1704 1705 char * 1706 skip(cpp) 1707 char **cpp; 1708 { 1709 char *cp = *cpp; 1710 char *start; 1711 1712 if (*cpp == NULL) 1713 return ((char *)0); 1714 1715 again: 1716 while (*cp == ' ' || *cp == '\t') 1717 cp++; 1718 if (*cp == '\0') { 1719 int c; 1720 1721 c = getc(fconfig); 1722 (void) ungetc(c, fconfig); 1723 if (c == ' ' || c == '\t') 1724 if ((cp = nextline(fconfig))) 1725 goto again; 1726 *cpp = (char *)0; 1727 return ((char *)0); 1728 } 1729 start = cp; 1730 while (*cp && *cp != ' ' && *cp != '\t') 1731 cp++; 1732 if (*cp != '\0') 1733 *cp++ = '\0'; 1734 *cpp = cp; 1735 return (start); 1736 } 1737 1738 char * 1739 nextline(fd) 1740 FILE *fd; 1741 { 1742 char *cp; 1743 1744 if (fgets(line, sizeof (line), fd) == NULL) 1745 return ((char *)0); 1746 cp = strchr(line, '\n'); 1747 if (cp) 1748 *cp = '\0'; 1749 return (line); 1750 } 1751 1752 char * 1753 newstr(cp) 1754 char *cp; 1755 { 1756 if ((cp = strdup(cp ? cp : ""))) 1757 return (cp); 1758 syslog(LOG_ERR, "strdup: %m"); 1759 exit(1); 1760 } 1761 1762 void 1763 inetd_setproctitle(a, s) 1764 char *a; 1765 int s; 1766 { 1767 socklen_t size; 1768 struct sockaddr_storage ss; 1769 char hbuf[NI_MAXHOST]; 1770 1771 size = sizeof(ss); 1772 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) { 1773 if (getnameinfo((struct sockaddr *)&ss, size, hbuf, 1774 sizeof(hbuf), NULL, 0, niflags) == 0) 1775 setproctitle("-%s [%s]", a, hbuf); 1776 else 1777 setproctitle("-%s [?]", a); 1778 } else 1779 setproctitle("-%s", a); 1780 } 1781 1782 void 1783 bump_nofile() 1784 { 1785 #ifdef RLIMIT_NOFILE 1786 1787 #define FD_CHUNK 32 1788 1789 struct rlimit rl; 1790 1791 if (getrlimit(RLIMIT_NOFILE, &rl) < 0) { 1792 syslog(LOG_ERR, "getrlimit: %m"); 1793 return; 1794 } 1795 rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK); 1796 if (rl.rlim_cur <= rlim_ofile_cur) { 1797 syslog(LOG_ERR, 1798 "bump_nofile: cannot extend file limit, max = %d", 1799 (int)rl.rlim_cur); 1800 return; 1801 } 1802 1803 if (setrlimit(RLIMIT_NOFILE, &rl) < 0) { 1804 syslog(LOG_ERR, "setrlimit: %m"); 1805 return; 1806 } 1807 1808 rlim_ofile_cur = rl.rlim_cur; 1809 return; 1810 1811 #else 1812 syslog(LOG_ERR, "bump_nofile: cannot extend file limit"); 1813 return; 1814 #endif 1815 } 1816 1817 /* 1818 * Internet services provided internally by inetd: 1819 */ 1820 #define BUFSIZE 4096 1821 1822 /* ARGSUSED */ 1823 void 1824 echo_stream(s, sep) /* Echo service -- echo data back */ 1825 int s; 1826 struct servtab *sep; 1827 { 1828 char buffer[BUFSIZE]; 1829 int i; 1830 1831 inetd_setproctitle(sep->se_service, s); 1832 while ((i = read(s, buffer, sizeof(buffer))) > 0 && 1833 write(s, buffer, i) > 0) 1834 ; 1835 } 1836 1837 /* ARGSUSED */ 1838 void 1839 echo_dg(s, sep) /* Echo service -- echo data back */ 1840 int s; 1841 struct servtab *sep; 1842 { 1843 char buffer[BUFSIZE]; 1844 int i; 1845 socklen_t size; 1846 struct sockaddr_storage ss; 1847 struct sockaddr *sa; 1848 1849 sa = (struct sockaddr *)&ss; 1850 size = sizeof(ss); 1851 if ((i = recvfrom(s, buffer, sizeof(buffer), 0, sa, &size)) < 0) 1852 return; 1853 if (port_good_dg(sa)) 1854 (void) sendto(s, buffer, i, 0, sa, size); 1855 } 1856 1857 /* ARGSUSED */ 1858 void 1859 discard_stream(s, sep) /* Discard service -- ignore data */ 1860 int s; 1861 struct servtab *sep; 1862 { 1863 char buffer[BUFSIZE]; 1864 1865 inetd_setproctitle(sep->se_service, s); 1866 while ((errno = 0, read(s, buffer, sizeof(buffer)) > 0) || 1867 errno == EINTR) 1868 ; 1869 } 1870 1871 /* ARGSUSED */ 1872 void 1873 discard_dg(s, sep) /* Discard service -- ignore data */ 1874 int s; 1875 struct servtab *sep; 1876 { 1877 char buffer[BUFSIZE]; 1878 1879 (void) read(s, buffer, sizeof(buffer)); 1880 } 1881 1882 #include <ctype.h> 1883 #define LINESIZ 72 1884 char ring[128]; 1885 char *endring; 1886 1887 void 1888 initring() 1889 { 1890 int i; 1891 1892 endring = ring; 1893 1894 for (i = 0; i <= 128; ++i) 1895 if (isprint(i)) 1896 *endring++ = i; 1897 } 1898 1899 /* ARGSUSED */ 1900 void 1901 chargen_stream(s, sep) /* Character generator */ 1902 int s; 1903 struct servtab *sep; 1904 { 1905 int len; 1906 char *rs, text[LINESIZ+2]; 1907 1908 inetd_setproctitle(sep->se_service, s); 1909 1910 if (!endring) { 1911 initring(); 1912 rs = ring; 1913 } 1914 1915 text[LINESIZ] = '\r'; 1916 text[LINESIZ + 1] = '\n'; 1917 for (rs = ring;;) { 1918 if ((len = endring - rs) >= LINESIZ) 1919 memmove(text, rs, LINESIZ); 1920 else { 1921 memmove(text, rs, len); 1922 memmove(text + len, ring, LINESIZ - len); 1923 } 1924 if (++rs == endring) 1925 rs = ring; 1926 if (write(s, text, sizeof(text)) != sizeof(text)) 1927 break; 1928 } 1929 } 1930 1931 /* ARGSUSED */ 1932 void 1933 chargen_dg(s, sep) /* Character generator */ 1934 int s; 1935 struct servtab *sep; 1936 { 1937 struct sockaddr_storage ss; 1938 struct sockaddr *sa; 1939 static char *rs; 1940 int len; 1941 socklen_t size; 1942 char text[LINESIZ+2]; 1943 1944 if (endring == 0) { 1945 initring(); 1946 rs = ring; 1947 } 1948 1949 sa = (struct sockaddr *)&ss; 1950 size = sizeof(ss); 1951 if (recvfrom(s, text, sizeof(text), 0, sa, &size) < 0) 1952 return; 1953 1954 if (!port_good_dg(sa)) 1955 return; 1956 1957 if ((len = endring - rs) >= LINESIZ) 1958 memmove(text, rs, LINESIZ); 1959 else { 1960 memmove(text, rs, len); 1961 memmove(text + len, ring, LINESIZ - len); 1962 } 1963 if (++rs == endring) 1964 rs = ring; 1965 text[LINESIZ] = '\r'; 1966 text[LINESIZ + 1] = '\n'; 1967 (void) sendto(s, text, sizeof(text), 0, sa, size); 1968 } 1969 1970 /* 1971 * Return a machine readable date and time, in the form of the 1972 * number of seconds since midnight, Jan 1, 1900. Since gettimeofday 1973 * returns the number of seconds since midnight, Jan 1, 1970, 1974 * we must add 2208988800 seconds to this figure to make up for 1975 * some seventy years Bell Labs was asleep. 1976 */ 1977 1978 uint32_t 1979 machtime() 1980 { 1981 struct timeval tv; 1982 1983 if (gettimeofday(&tv, (struct timezone *)0) < 0) { 1984 if (debug) 1985 fprintf(stderr, "Unable to get time of day\n"); 1986 return (0); 1987 } 1988 #define OFFSET ((uint32_t)25567 * 24*60*60) 1989 return (htonl((uint32_t)(tv.tv_sec + OFFSET))); 1990 #undef OFFSET 1991 } 1992 1993 /* ARGSUSED */ 1994 void 1995 machtime_stream(s, sep) 1996 int s; 1997 struct servtab *sep; 1998 { 1999 uint32_t result; 2000 2001 result = machtime(); 2002 (void) write(s, (char *) &result, sizeof(result)); 2003 } 2004 2005 /* ARGSUSED */ 2006 void 2007 machtime_dg(s, sep) 2008 int s; 2009 struct servtab *sep; 2010 { 2011 uint32_t result; 2012 struct sockaddr_storage ss; 2013 struct sockaddr *sa; 2014 socklen_t size; 2015 2016 sa = (struct sockaddr *)&ss; 2017 size = sizeof(ss); 2018 if (recvfrom(s, (char *)&result, sizeof(result), 0, sa, &size) < 0) 2019 return; 2020 if (!port_good_dg(sa)) 2021 return; 2022 result = machtime(); 2023 (void) sendto(s, (char *) &result, sizeof(result), 0, sa, size); 2024 } 2025 2026 /* ARGSUSED */ 2027 void 2028 daytime_stream(s, sep) /* Return human-readable time of day */ 2029 int s; 2030 struct servtab *sep; 2031 { 2032 char buffer[256]; 2033 time_t clock; 2034 int len; 2035 2036 clock = time((time_t *) 0); 2037 2038 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 2039 (void) write(s, buffer, len); 2040 } 2041 2042 /* ARGSUSED */ 2043 void 2044 daytime_dg(s, sep) /* Return human-readable time of day */ 2045 int s; 2046 struct servtab *sep; 2047 { 2048 char buffer[256]; 2049 time_t clock; 2050 struct sockaddr_storage ss; 2051 struct sockaddr *sa; 2052 socklen_t size; 2053 int len; 2054 2055 clock = time((time_t *) 0); 2056 2057 sa = (struct sockaddr *)&ss; 2058 size = sizeof(ss); 2059 if (recvfrom(s, buffer, sizeof(buffer), 0, sa, &size) < 0) 2060 return; 2061 if (!port_good_dg(sa)) 2062 return; 2063 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 2064 (void) sendto(s, buffer, len, 0, sa, size); 2065 } 2066 2067 /* 2068 * print_service: 2069 * Dump relevant information to stderr 2070 */ 2071 void 2072 print_service(action, sep) 2073 char *action; 2074 struct servtab *sep; 2075 { 2076 2077 if (isrpcservice(sep)) 2078 fprintf(stderr, 2079 "%s: %s rpcprog=%d, rpcvers = %d/%d, proto=%s, wait:max=%d.%d, user:group=%s.%s builtin=%lx server=%s" 2080 #ifdef IPSEC 2081 " policy=\"%s\"" 2082 #endif 2083 "\n", 2084 action, sep->se_service, 2085 sep->se_rpcprog, sep->se_rpcversh, sep->se_rpcversl, sep->se_proto, 2086 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 2087 (long)sep->se_bi, sep->se_server 2088 #ifdef IPSEC 2089 , (sep->se_policy ? sep->se_policy : "") 2090 #endif 2091 ); 2092 else 2093 fprintf(stderr, 2094 "%s: %s proto=%s%s, wait:max=%d.%d, user:group=%s.%s builtin=%lx server=%s" 2095 #ifdef IPSEC 2096 " policy=%s" 2097 #endif 2098 "\n", 2099 action, sep->se_service, 2100 sep->se_type == FAITH_TYPE ? "faith/" : "", 2101 sep->se_proto, 2102 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 2103 (long)sep->se_bi, sep->se_server 2104 #ifdef IPSEC 2105 , (sep->se_policy ? sep->se_policy : "") 2106 #endif 2107 ); 2108 } 2109 2110 void 2111 usage() 2112 { 2113 2114 #ifdef LIBWRAP 2115 (void)fprintf(stderr, "usage: %s [-dl] [conf]\n", getprogname()); 2116 #else 2117 (void)fprintf(stderr, "usage: %s [-d] [conf]\n", getprogname()); 2118 #endif 2119 exit(1); 2120 } 2121 2122 2123 /* 2124 * Based on TCPMUX.C by Mark K. Lottor November 1988 2125 * sri-nic::ps:<mkl>tcpmux.c 2126 */ 2127 2128 static int /* # of characters upto \r,\n or \0 */ 2129 getline(fd, buf, len) 2130 int fd; 2131 char *buf; 2132 int len; 2133 { 2134 int count = 0, n; 2135 2136 do { 2137 n = read(fd, buf, len-count); 2138 if (n == 0) 2139 return (count); 2140 if (n < 0) 2141 return (-1); 2142 while (--n >= 0) { 2143 if (*buf == '\r' || *buf == '\n' || *buf == '\0') 2144 return (count); 2145 count++; 2146 buf++; 2147 } 2148 } while (count < len); 2149 return (count); 2150 } 2151 2152 #define MAX_SERV_LEN (256+2) /* 2 bytes for \r\n */ 2153 2154 #define strwrite(fd, buf) (void) write(fd, buf, sizeof(buf)-1) 2155 2156 void 2157 tcpmux(ctrl, sep) 2158 int ctrl; 2159 struct servtab *sep; 2160 { 2161 char service[MAX_SERV_LEN+1]; 2162 int len; 2163 2164 /* Get requested service name */ 2165 if ((len = getline(ctrl, service, MAX_SERV_LEN)) < 0) { 2166 strwrite(ctrl, "-Error reading service name\r\n"); 2167 goto reject; 2168 } 2169 service[len] = '\0'; 2170 2171 if (debug) 2172 fprintf(stderr, "tcpmux: someone wants %s\n", service); 2173 2174 /* 2175 * Help is a required command, and lists available services, 2176 * one per line. 2177 */ 2178 if (!strcasecmp(service, "help")) { 2179 strwrite(ctrl, "+Available services:\r\n"); 2180 strwrite(ctrl, "help\r\n"); 2181 for (sep = servtab; sep; sep = sep->se_next) { 2182 if (!ISMUX(sep)) 2183 continue; 2184 (void)write(ctrl, sep->se_service, 2185 strlen(sep->se_service)); 2186 strwrite(ctrl, "\r\n"); 2187 } 2188 goto reject; 2189 } 2190 2191 /* Try matching a service in inetd.conf with the request */ 2192 for (sep = servtab; sep; sep = sep->se_next) { 2193 if (!ISMUX(sep)) 2194 continue; 2195 if (!strcasecmp(service, sep->se_service)) { 2196 if (ISMUXPLUS(sep)) 2197 strwrite(ctrl, "+Go\r\n"); 2198 run_service(ctrl, sep); 2199 return; 2200 } 2201 } 2202 strwrite(ctrl, "-Service not available\r\n"); 2203 reject: 2204 _exit(1); 2205 } 2206 2207 #ifdef MULOG 2208 void 2209 dolog(sep, ctrl) 2210 struct servtab *sep; 2211 int ctrl; 2212 { 2213 struct sockaddr_storage ss; 2214 struct sockaddr *sa = (struct sockaddr *)&ss; 2215 socklen_t len = sizeof(ss); 2216 char *host, *dp, buf[BUFSIZ]; 2217 int connected = 1; 2218 2219 switch (sep->se_family) { 2220 case AF_INET: 2221 #ifdef INET6 2222 case AF_INET6: 2223 #endif 2224 break; 2225 default: 2226 return; 2227 } 2228 2229 if (getpeername(ctrl, sa, &len) < 0) { 2230 if (errno != ENOTCONN) { 2231 syslog(LOG_ERR, "getpeername: %m"); 2232 return; 2233 } 2234 if (recvfrom(ctrl, buf, sizeof(buf), MSG_PEEK, sa, &len) < 0) { 2235 syslog(LOG_ERR, "recvfrom: %m"); 2236 return; 2237 } 2238 connected = 0; 2239 } 2240 switch (sa->sa_family) { 2241 case AF_INET: 2242 #ifdef INET6 2243 case AF_INET6: 2244 #endif 2245 break; 2246 default: 2247 syslog(LOG_ERR, "unexpected address family %u", sa->sa_family); 2248 return; 2249 } 2250 2251 if (getnameinfo(sa, len, buf, sizeof(buf), NULL, 0, 0) != 0) 2252 strcpy(buf, "?"); 2253 host = buf; 2254 2255 switch (sep->se_log & ~MULOG_RFC931) { 2256 case 0: 2257 return; 2258 case 1: 2259 if (curdom == NULL || *curdom == '\0') 2260 break; 2261 dp = host + strlen(host) - strlen(curdom); 2262 if (dp < host) 2263 break; 2264 if (debug) 2265 fprintf(stderr, "check \"%s\" against curdom \"%s\"\n", 2266 host, curdom); 2267 if (strcasecmp(dp, curdom) == 0) 2268 return; 2269 break; 2270 case 2: 2271 default: 2272 break; 2273 } 2274 2275 openlog("", LOG_NOWAIT, MULOG); 2276 2277 if (connected && (sep->se_log & MULOG_RFC931)) 2278 syslog(LOG_INFO, "%s@%s wants %s", 2279 rfc931_name(sa, ctrl), host, sep->se_service); 2280 else 2281 syslog(LOG_INFO, "%s wants %s", 2282 host, sep->se_service); 2283 } 2284 2285 /* 2286 * From tcp_log by 2287 * Wietse Venema, Eindhoven University of Technology, The Netherlands. 2288 */ 2289 #if 0 2290 static char sccsid[] = "@(#) rfc931.c 1.3 92/08/31 22:54:46"; 2291 #endif 2292 2293 #include <setjmp.h> 2294 2295 #define RFC931_PORT 113 /* Semi-well-known port */ 2296 #define TIMEOUT 4 2297 #define TIMEOUT2 10 2298 2299 static jmp_buf timebuf; 2300 2301 /* timeout - handle timeouts */ 2302 2303 static void 2304 timeout(sig) 2305 int sig; 2306 { 2307 longjmp(timebuf, sig); 2308 } 2309 2310 /* rfc931_name - return remote user name */ 2311 2312 char * 2313 rfc931_name(there, ctrl) 2314 struct sockaddr *there; /* remote link information */ 2315 int ctrl; 2316 { 2317 struct sockaddr_storage here; /* local link information */ 2318 struct sockaddr_storage sin; /* for talking to RFC931 daemon */ 2319 socklen_t length; 2320 int s; 2321 unsigned remote; 2322 unsigned local; 2323 static char user[256]; /* XXX */ 2324 char buf[256]; 2325 char *cp; 2326 char *result = "USER_UNKNOWN"; 2327 int len; 2328 u_int16_t myport, hisport; 2329 2330 /* Find out local port number of our stdin. */ 2331 2332 length = sizeof(here); 2333 if (getsockname(ctrl, (struct sockaddr *) &here, &length) == -1) { 2334 syslog(LOG_ERR, "getsockname: %m"); 2335 return (result); 2336 } 2337 switch (here.ss_family) { 2338 case AF_INET: 2339 myport = ((struct sockaddr_in *)&here)->sin_port; 2340 break; 2341 #ifdef INET6 2342 case AF_INET6: 2343 myport = ((struct sockaddr_in6 *)&here)->sin6_port; 2344 break; 2345 #endif 2346 } 2347 switch (there->sa_family) { 2348 case AF_INET: 2349 hisport = ((struct sockaddr_in *)&there)->sin_port; 2350 break; 2351 #ifdef INET6 2352 case AF_INET6: 2353 hisport = ((struct sockaddr_in6 *)&there)->sin6_port; 2354 break; 2355 #endif 2356 } 2357 /* Set up timer so we won't get stuck. */ 2358 2359 if ((s = socket(here.ss_family, SOCK_STREAM, 0)) == -1) { 2360 syslog(LOG_ERR, "socket: %m"); 2361 return (result); 2362 } 2363 2364 sin = here; 2365 switch (sin.ss_family) { 2366 case AF_INET: 2367 ((struct sockaddr_in *)&sin)->sin_port = htons(0); 2368 break; 2369 #ifdef INET6 2370 case AF_INET6: 2371 ((struct sockaddr_in6 *)&sin)->sin6_port = htons(0); 2372 break; 2373 #endif 2374 } 2375 if (bind(s, (struct sockaddr *) &sin, sin.ss_len) == -1) { 2376 syslog(LOG_ERR, "bind: %m"); 2377 return (result); 2378 } 2379 2380 signal(SIGALRM, timeout); 2381 if (setjmp(timebuf)) { 2382 close(s); /* not: fclose(fp) */ 2383 return (result); 2384 } 2385 alarm(TIMEOUT); 2386 2387 /* Connect to the RFC931 daemon. */ 2388 2389 memcpy(&sin, there, there->sa_len); 2390 switch (sin.ss_family) { 2391 case AF_INET: 2392 ((struct sockaddr_in *)&sin)->sin_port = htons(RFC931_PORT); 2393 break; 2394 #ifdef INET6 2395 case AF_INET6: 2396 ((struct sockaddr_in6 *)&sin)->sin6_port = htons(RFC931_PORT); 2397 break; 2398 #endif 2399 } 2400 if (connect(s, (struct sockaddr *) &sin, sin.ss_len) == -1) { 2401 close(s); 2402 alarm(0); 2403 return (result); 2404 } 2405 2406 /* Query the RFC 931 server. Would 13-byte writes ever be broken up? */ 2407 (void)snprintf(buf, sizeof buf, "%u,%u\r\n", ntohs(hisport), 2408 ntohs(myport)); 2409 2410 for (len = 0, cp = buf; len < strlen(buf); ) { 2411 int n; 2412 2413 if ((n = write(s, cp, strlen(buf) - len)) == -1) { 2414 close(s); 2415 alarm(0); 2416 return (result); 2417 } 2418 cp += n; 2419 len += n; 2420 } 2421 2422 /* Read response */ 2423 for (cp = buf; cp < buf + sizeof(buf) - 1; ) { 2424 char c; 2425 if (read(s, &c, 1) != 1) { 2426 close(s); 2427 alarm(0); 2428 return (result); 2429 } 2430 if (c == '\n') 2431 break; 2432 *cp++ = c; 2433 } 2434 *cp = '\0'; 2435 2436 if (sscanf(buf, "%u , %u : USERID :%*[^:]:%255s", &remote, &local, 2437 user) == 3 && ntohs(hisport) == remote && ntohs(myport) == local) { 2438 /* Strip trailing carriage return. */ 2439 if ((cp = strchr(user, '\r')) != NULL) 2440 *cp = 0; 2441 result = user; 2442 } 2443 2444 alarm(0); 2445 close(s); 2446 return (result); 2447 } 2448 #endif 2449 2450 /* 2451 * check if the address/port where send data to is one of the obvious ports 2452 * that are used for denial of service attacks like two echo ports 2453 * just echoing data between them 2454 */ 2455 int 2456 port_good_dg(sa) 2457 struct sockaddr *sa; 2458 { 2459 struct in_addr in; 2460 #ifdef INET6 2461 struct in6_addr *in6; 2462 #endif 2463 u_int16_t port; 2464 int i, bad; 2465 char hbuf[NI_MAXHOST]; 2466 2467 bad = 0; 2468 2469 switch (sa->sa_family) { 2470 case AF_INET: 2471 in.s_addr = ntohl(((struct sockaddr_in *)sa)->sin_addr.s_addr); 2472 port = ntohs(((struct sockaddr_in *)sa)->sin_port); 2473 v4chk: 2474 if (IN_MULTICAST(in.s_addr)) 2475 goto bad; 2476 switch ((in.s_addr & 0xff000000) >> 24) { 2477 case 0: case 127: case 255: 2478 goto bad; 2479 } 2480 /* XXX check for subnet broadcast using getifaddrs(3) */ 2481 break; 2482 #ifdef INET6 2483 case AF_INET6: 2484 in6 = &((struct sockaddr_in6 *)sa)->sin6_addr; 2485 port = ntohs(((struct sockaddr_in6 *)sa)->sin6_port); 2486 if (IN6_IS_ADDR_MULTICAST(in6) || IN6_IS_ADDR_UNSPECIFIED(in6)) 2487 goto bad; 2488 if (IN6_IS_ADDR_V4MAPPED(in6) || IN6_IS_ADDR_V4COMPAT(in6)) { 2489 memcpy(&in, &in6->s6_addr[12], sizeof(in)); 2490 in.s_addr = ntohl(in.s_addr); 2491 goto v4chk; 2492 } 2493 break; 2494 #endif 2495 default: 2496 /* XXX unsupported af, is it safe to assume it to be safe? */ 2497 return 1; 2498 } 2499 2500 for (i = 0; bad_ports[i] != 0; i++) { 2501 if (port == bad_ports[i]) 2502 goto bad; 2503 } 2504 2505 return (1); 2506 2507 bad: 2508 if (getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), NULL, 0, 2509 niflags) != 0) 2510 strcpy(hbuf, "?"); 2511 syslog(LOG_WARNING,"Possible DoS attack from %s, Port %d", 2512 hbuf, port); 2513 return (0); 2514 } 2515
Indexes created Fri Sep 26 20:09:58 GMT 2025