inetd.c revision 1.96
1 /* $NetBSD: inetd.c,v 1.96 2004/09/14 17:42:31 rumble Exp $ */ 2 3 /*- 4 * Copyright (c) 1998, 2003 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 and by Matthias Scheler. 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. Neither the name of the University nor the names of its contributors 53 * may be used to endorse or promote products derived from this software 54 * without specific prior written permission. 55 * 56 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 57 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 58 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 59 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 60 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 61 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 62 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 63 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 64 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 65 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 66 * SUCH DAMAGE. 67 */ 68 69 #include <sys/cdefs.h> 70 #ifndef lint 71 __COPYRIGHT("@(#) Copyright (c) 1983, 1991, 1993, 1994\n\ 72 The Regents of the University of California. All rights reserved.\n"); 73 #if 0 74 static char sccsid[] = "@(#)inetd.c 8.4 (Berkeley) 4/13/94"; 75 #else 76 __RCSID("$NetBSD: inetd.c,v 1.96 2004/09/14 17:42:31 rumble Exp $"); 77 #endif 78 #endif /* not lint */ 79 80 /* 81 * Inetd - Internet super-server 82 * 83 * This program invokes all internet services as needed. Connection-oriented 84 * services are invoked each time a connection is made, by creating a process. 85 * This process is passed the connection as file descriptor 0 and is expected 86 * to do a getpeername to find out the source host and port. 87 * 88 * Datagram oriented services are invoked when a datagram 89 * arrives; a process is created and passed a pending message 90 * on file descriptor 0. Datagram servers may either connect 91 * to their peer, freeing up the original socket for inetd 92 * to receive further messages on, or ``take over the socket'', 93 * processing all arriving datagrams and, eventually, timing 94 * out. The first type of server is said to be ``multi-threaded''; 95 * the second type of server ``single-threaded''. 96 * 97 * Inetd uses a configuration file which is read at startup 98 * and, possibly, at some later time in response to a hangup signal. 99 * The configuration file is ``free format'' with fields given in the 100 * order shown below. Continuation lines for an entry must being with 101 * a space or tab. All fields must be present in each entry. 102 * 103 * service name must be in /etc/services or must 104 * name a tcpmux service 105 * socket type stream/dgram/raw/rdm/seqpacket 106 * protocol must be in /etc/protocols 107 * wait/nowait[:max] single-threaded/multi-threaded, max # 108 * user[:group] user/group to run daemon as 109 * server program full path name 110 * server program arguments maximum of MAXARGS (20) 111 * 112 * For RPC services 113 * service name/version must be in /etc/rpc 114 * socket type stream/dgram/raw/rdm/seqpacket 115 * protocol must be in /etc/protocols 116 * wait/nowait[:max] single-threaded/multi-threaded 117 * user[:group] user to run daemon as 118 * server program full path name 119 * server program arguments maximum of MAXARGS (20) 120 * 121 * For non-RPC services, the "service name" can be of the form 122 * hostaddress:servicename, in which case the hostaddress is used 123 * as the host portion of the address to listen on. If hostaddress 124 * consists of a single `*' character, INADDR_ANY is used. 125 * 126 * A line can also consist of just 127 * hostaddress: 128 * where hostaddress is as in the preceding paragraph. Such a line must 129 * have no further fields; the specified hostaddress is remembered and 130 * used for all further lines that have no hostaddress specified, 131 * until the next such line (or EOF). (This is why * is provided to 132 * allow explicit specification of INADDR_ANY.) A line 133 * *: 134 * is implicitly in effect at the beginning of the file. 135 * 136 * The hostaddress specifier may (and often will) contain dots; 137 * the service name must not. 138 * 139 * For RPC services, host-address specifiers are accepted and will 140 * work to some extent; however, because of limitations in the 141 * portmapper interface, it will not work to try to give more than 142 * one line for any given RPC service, even if the host-address 143 * specifiers are different. 144 * 145 * TCP services without official port numbers are handled with the 146 * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for 147 * requests. When a connection is made from a foreign host, the service 148 * requested is passed to tcpmux, which looks it up in the servtab list 149 * and returns the proper entry for the service. Tcpmux returns a 150 * negative reply if the service doesn't exist, otherwise the invoked 151 * server is expected to return the positive reply if the service type in 152 * inetd.conf file has the prefix "tcpmux/". If the service type has the 153 * prefix "tcpmux/+", tcpmux will return the positive reply for the 154 * process; this is for compatibility with older server code, and also 155 * allows you to invoke programs that use stdin/stdout without putting any 156 * special server code in them. Services that use tcpmux are "nowait" 157 * because they do not have a well-known port and hence cannot listen 158 * for new requests. 159 * 160 * Comment lines are indicated by a `#' in column 1. 161 * 162 * #ifdef IPSEC 163 * Comment lines that start with "#@" denote IPsec policy string, as described 164 * in ipsec_set_policy(3). This will affect all the following items in 165 * inetd.conf(8). To reset the policy, just use "#@" line. By default, 166 * there's no IPsec policy. 167 * #endif 168 */ 169 170 /* 171 * Here's the scoop concerning the user:group feature: 172 * 173 * 1) set-group-option off. 174 * 175 * a) user = root: NO setuid() or setgid() is done 176 * 177 * b) other: setuid() 178 * setgid(primary group as found in passwd) 179 * initgroups(name, primary group) 180 * 181 * 2) set-group-option on. 182 * 183 * a) user = root: NO setuid() 184 * setgid(specified group) 185 * NO initgroups() 186 * 187 * b) other: setuid() 188 * setgid(specified group) 189 * initgroups(name, specified group) 190 * 191 */ 192 193 #include <sys/param.h> 194 #include <sys/stat.h> 195 #include <sys/ioctl.h> 196 #include <sys/socket.h> 197 #include <sys/un.h> 198 #include <sys/wait.h> 199 #include <sys/time.h> 200 #include <sys/resource.h> 201 #include <sys/event.h> 202 203 #ifndef RLIMIT_NOFILE 204 #define RLIMIT_NOFILE RLIMIT_OFILE 205 #endif 206 207 #ifndef NO_RPC 208 #define RPC 209 #endif 210 211 #include <net/if.h> 212 213 #include <netinet/in.h> 214 #include <arpa/inet.h> 215 #ifdef RPC 216 #include <rpc/rpc.h> 217 #include <rpc/rpcb_clnt.h> 218 #include <netconfig.h> 219 #endif 220 221 #include <ctype.h> 222 #include <errno.h> 223 #include <fcntl.h> 224 #include <grp.h> 225 #include <netdb.h> 226 #include <pwd.h> 227 #include <signal.h> 228 #include <stdio.h> 229 #include <stdlib.h> 230 #include <string.h> 231 #include <syslog.h> 232 #include <unistd.h> 233 #include <util.h> 234 #include <ifaddrs.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 A_CNT(a) (sizeof (a) / sizeof (a[0])) 269 270 int debug; 271 #ifdef LIBWRAP 272 int lflag; 273 #endif 274 int maxsock; 275 int kq; 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 kevent changebuf[64]; 295 size_t changes; 296 297 struct servtab { 298 char *se_hostaddr; /* host address to listen on */ 299 char *se_service; /* name of service */ 300 int se_socktype; /* type of socket to use */ 301 int se_family; /* address family */ 302 char *se_proto; /* protocol used */ 303 int se_sndbuf; /* sndbuf size */ 304 int se_rcvbuf; /* rcvbuf size */ 305 int se_rpcprog; /* rpc program number */ 306 int se_rpcversl; /* rpc program lowest version */ 307 int se_rpcversh; /* rpc program highest version */ 308 #define isrpcservice(sep) ((sep)->se_rpcversl != 0) 309 pid_t se_wait; /* single threaded server */ 310 short se_checked; /* looked at during merge */ 311 char *se_user; /* user name to run as */ 312 char *se_group; /* group name to run as */ 313 struct biltin *se_bi; /* if built-in, description */ 314 char *se_server; /* server program */ 315 #define MAXARGV 20 316 char *se_argv[MAXARGV+1]; /* program arguments */ 317 #ifdef IPSEC 318 char *se_policy; /* IPsec poilcy string */ 319 #endif 320 int se_fd; /* open descriptor */ 321 int se_type; /* type */ 322 union { 323 struct sockaddr se_un_ctrladdr; 324 struct sockaddr_in se_un_ctrladdr_in; 325 struct sockaddr_in6 se_un_ctrladdr_in6; 326 struct sockaddr_un se_un_ctrladdr_un; 327 } se_un; /* bound address */ 328 #define se_ctrladdr se_un.se_un_ctrladdr 329 #define se_ctrladdr_in se_un.se_un_ctrladdr_in 330 #define se_ctrladdr_un se_un.se_un_ctrladdr_un 331 int se_ctrladdr_size; 332 int se_max; /* max # of instances of this service */ 333 int se_count; /* number started since se_time */ 334 struct timeval se_time; /* start of se_count */ 335 #ifdef MULOG 336 int se_log; 337 #define MULOG_RFC931 0x40000000 338 #endif 339 struct servtab *se_next; 340 } *servtab; 341 342 #define NORM_TYPE 0 343 #define MUX_TYPE 1 344 #define MUXPLUS_TYPE 2 345 #define FAITH_TYPE 3 346 #define ISMUX(sep) (((sep)->se_type == MUX_TYPE) || \ 347 ((sep)->se_type == MUXPLUS_TYPE)) 348 #define ISMUXPLUS(sep) ((sep)->se_type == MUXPLUS_TYPE) 349 350 351 static void chargen_dg(int, struct servtab *); 352 static void chargen_stream(int, struct servtab *); 353 static void close_sep(struct servtab *); 354 static void config(void); 355 static void daytime_dg(int, struct servtab *); 356 static void daytime_stream(int, struct servtab *); 357 static void discard_dg(int, struct servtab *); 358 static void discard_stream(int, struct servtab *); 359 static void echo_dg(int, struct servtab *); 360 static void echo_stream(int, struct servtab *); 361 static void endconfig(void); 362 static struct servtab *enter(struct servtab *); 363 static void freeconfig(struct servtab *); 364 static struct servtab *getconfigent(void); 365 static void goaway(void); 366 static void machtime_dg(int, struct servtab *); 367 static void machtime_stream(int, struct servtab *); 368 static char *newstr(char *); 369 static char *nextline(FILE *); 370 static void print_service(char *, struct servtab *); 371 static void reapchild(void); 372 static void retry(void); 373 static void run_service(int, struct servtab *); 374 static int setconfig(void); 375 static void setup(struct servtab *); 376 static char *sskip(char **); 377 static char *skip(char **); 378 static void tcpmux(int, struct servtab *); 379 static void usage(void); 380 static void register_rpc(struct servtab *); 381 static void unregister_rpc(struct servtab *); 382 static void bump_nofile(void); 383 static void inetd_setproctitle(char *, int); 384 static void initring(void); 385 static uint32_t machtime(void); 386 static int port_good_dg(struct sockaddr *); 387 static int dg_broadcast(struct in_addr *); 388 static int my_kevent(const struct kevent *, size_t, struct kevent *, 389 size_t); 390 static struct kevent * allocchange(void); 391 static int getline(int, char *, int); 392 static void spawn(struct servtab *, int); 393 #ifdef MULOG 394 static void dolog(struct servtab *, int); 395 static void timeout(int); 396 static char *rfc931_name(struct sockaddr *, int); 397 #endif 398 399 struct biltin { 400 char *bi_service; /* internally provided service name */ 401 int bi_socktype; /* type of socket supported */ 402 short bi_fork; /* 1 if should fork before call */ 403 short bi_wait; /* 1 if should wait for child */ 404 void (*bi_fn)(int, struct servtab *); 405 /* function which performs it */ 406 } biltins[] = { 407 /* Echo received data */ 408 { "echo", SOCK_STREAM, 1, 0, echo_stream }, 409 { "echo", SOCK_DGRAM, 0, 0, echo_dg }, 410 411 /* Internet /dev/null */ 412 { "discard", SOCK_STREAM, 1, 0, discard_stream }, 413 { "discard", SOCK_DGRAM, 0, 0, discard_dg }, 414 415 /* Return 32 bit time since 1970 */ 416 { "time", SOCK_STREAM, 0, 0, machtime_stream }, 417 { "time", SOCK_DGRAM, 0, 0, machtime_dg }, 418 419 /* Return human-readable time */ 420 { "daytime", SOCK_STREAM, 0, 0, daytime_stream }, 421 { "daytime", SOCK_DGRAM, 0, 0, daytime_dg }, 422 423 /* Familiar character generator */ 424 { "chargen", SOCK_STREAM, 1, 0, chargen_stream }, 425 { "chargen", SOCK_DGRAM, 0, 0, chargen_dg }, 426 427 { "tcpmux", SOCK_STREAM, 1, 0, tcpmux }, 428 429 { NULL } 430 }; 431 432 /* list of "bad" ports. I.e. ports that are most obviously used for 433 * "cycling packets" denial of service attacks. See /etc/services. 434 * List must end with port number "0". 435 */ 436 437 u_int16_t bad_ports[] = { 7, 9, 13, 19, 37, 0 }; 438 439 440 #define NUMINT (sizeof(intab) / sizeof(struct inent)) 441 char *CONFIG = _PATH_INETDCONF; 442 443 static int my_signals[] = 444 { SIGALRM, SIGHUP, SIGCHLD, SIGTERM, SIGINT, SIGPIPE }; 445 446 int 447 main(int argc, char *argv[]) 448 { 449 int ch, n, reload = 1; 450 451 while ((ch = getopt(argc, argv, 452 #ifdef LIBWRAP 453 "dl" 454 #else 455 "d" 456 #endif 457 )) != -1) 458 switch(ch) { 459 case 'd': 460 debug = 1; 461 options |= SO_DEBUG; 462 break; 463 #ifdef LIBWRAP 464 case 'l': 465 lflag = 1; 466 break; 467 #endif 468 case '?': 469 default: 470 usage(); 471 } 472 argc -= optind; 473 argv += optind; 474 475 if (argc > 0) 476 CONFIG = argv[0]; 477 478 if (!debug) 479 daemon(0, 0); 480 openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON); 481 pidfile(NULL); 482 483 kq = kqueue(); 484 if (kq < 0) { 485 syslog(LOG_ERR, "kqueue: %m"); 486 return (EXIT_FAILURE); 487 } 488 489 #ifdef RLIMIT_NOFILE 490 if (getrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) { 491 syslog(LOG_ERR, "getrlimit: %m"); 492 } else { 493 rlim_ofile_cur = rlim_ofile.rlim_cur; 494 if (rlim_ofile_cur == RLIM_INFINITY) /* ! */ 495 rlim_ofile_cur = OPEN_MAX; 496 } 497 #endif 498 499 for (n = 0; n < A_CNT(my_signals); n++) { 500 int signum; 501 502 signum = my_signals[n]; 503 (void) signal(signum, SIG_IGN); 504 505 if (signum != SIGPIPE) { 506 struct kevent *ev; 507 508 ev = allocchange(); 509 EV_SET(ev, signum, EVFILT_SIGNAL, EV_ADD | EV_ENABLE, 510 0, 0, 0); 511 } 512 } 513 514 for (;;) { 515 int ctrl; 516 struct kevent eventbuf[64], *ev; 517 struct servtab *sep; 518 519 if (reload) { 520 reload = 0; 521 config(); 522 } 523 524 n = my_kevent(changebuf, changes, eventbuf, A_CNT(eventbuf)); 525 changes = 0; 526 527 for (ev = eventbuf; n > 0; ev++, n--) { 528 if (ev->filter == EVFILT_SIGNAL) { 529 switch (ev->ident) { 530 case SIGALRM: 531 retry(); 532 break; 533 case SIGCHLD: 534 reapchild(); 535 break; 536 case SIGTERM: 537 case SIGINT: 538 goaway(); 539 break; 540 case SIGHUP: 541 reload = 1; 542 break; 543 } 544 continue; 545 } 546 if (ev->filter != EVFILT_READ) 547 continue; 548 sep = (struct servtab *)ev->udata; 549 /* Paranoia */ 550 if (ev->ident != sep->se_fd) 551 continue; 552 if (debug) 553 fprintf(stderr, "someone wants %s\n", 554 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, NULL, NULL); 558 if (debug) 559 fprintf(stderr, "accept, ctrl %d\n", 560 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 spawn(sep, ctrl); 571 } 572 } 573 } 574 575 static void 576 spawn(struct servtab *sep, int ctrl) 577 { 578 int dofork; 579 pid_t pid; 580 581 pid = 0; 582 #ifdef LIBWRAP_INTERNAL 583 dofork = 1; 584 #else 585 dofork = (sep->se_bi == 0 || sep->se_bi->bi_fork); 586 #endif 587 if (dofork) { 588 if (sep->se_count++ == 0) 589 (void)gettimeofday(&sep->se_time, NULL); 590 else if (sep->se_count >= sep->se_max) { 591 struct timeval now; 592 593 (void)gettimeofday(&now, NULL); 594 if (now.tv_sec - sep->se_time.tv_sec > CNT_INTVL) { 595 sep->se_time = now; 596 sep->se_count = 1; 597 } else { 598 syslog(LOG_ERR, 599 "%s/%s max spawn rate (%d in %d seconds) " 600 "exceeded; service not started", 601 sep->se_service, sep->se_proto, 602 sep->se_max, CNT_INTVL); 603 if (!sep->se_wait && sep->se_socktype == 604 SOCK_STREAM) 605 close(ctrl); 606 close_sep(sep); 607 if (!timingout) { 608 timingout = 1; 609 alarm(RETRYTIME); 610 } 611 return; 612 } 613 } 614 pid = fork(); 615 if (pid < 0) { 616 syslog(LOG_ERR, "fork: %m"); 617 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 618 close(ctrl); 619 sleep(1); 620 return; 621 } 622 if (pid != 0 && sep->se_wait) { 623 struct kevent *ev; 624 625 sep->se_wait = pid; 626 ev = allocchange(); 627 EV_SET(ev, sep->se_fd, EVFILT_READ, 628 EV_DELETE, 0, 0, 0); 629 } 630 if (pid == 0) { 631 int n; 632 633 for (n = 0; n < A_CNT(my_signals); n++) 634 (void) signal(my_signals[n], SIG_DFL); 635 if (debug) 636 setsid(); 637 } 638 } 639 if (pid == 0) { 640 run_service(ctrl, sep); 641 if (dofork) 642 exit(0); 643 } 644 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 645 close(ctrl); 646 } 647 648 static void 649 run_service(int ctrl, struct servtab *sep) 650 { 651 struct passwd *pwd; 652 struct group *grp = NULL; /* XXX gcc */ 653 char buf[NI_MAXSERV]; 654 #ifdef LIBWRAP 655 struct request_info req; 656 int denied; 657 char *service = NULL; /* XXX gcc */ 658 #endif 659 660 #ifdef LIBWRAP 661 #ifndef LIBWRAP_INTERNAL 662 if (sep->se_bi == 0) 663 #endif 664 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 665 request_init(&req, RQ_DAEMON, sep->se_argv[0] ? 666 sep->se_argv[0] : sep->se_service, RQ_FILE, ctrl, NULL); 667 fromhost(&req); 668 denied = !hosts_access(&req); 669 if (denied || lflag) { 670 if (getnameinfo(&sep->se_ctrladdr, 671 sep->se_ctrladdr.sa_len, NULL, 0, 672 buf, sizeof(buf), 0) != 0) { 673 /* shouldn't happen */ 674 (void)snprintf(buf, sizeof buf, "%d", 675 ntohs(sep->se_ctrladdr_in.sin_port)); 676 } 677 service = buf; 678 } 679 if (denied) { 680 syslog(deny_severity, 681 "refused connection from %.500s, service %s (%s)", 682 eval_client(&req), service, sep->se_proto); 683 goto reject; 684 } 685 if (lflag) { 686 syslog(allow_severity, 687 "connection from %.500s, service %s (%s)", 688 eval_client(&req), service, sep->se_proto); 689 } 690 } 691 #endif /* LIBWRAP */ 692 693 if (sep->se_bi) { 694 (*sep->se_bi->bi_fn)(ctrl, sep); 695 } else { 696 if ((pwd = getpwnam(sep->se_user)) == NULL) { 697 syslog(LOG_ERR, "%s/%s: %s: No such user", 698 sep->se_service, sep->se_proto, sep->se_user); 699 goto reject; 700 } 701 if (sep->se_group && 702 (grp = getgrnam(sep->se_group)) == NULL) { 703 syslog(LOG_ERR, "%s/%s: %s: No such group", 704 sep->se_service, sep->se_proto, sep->se_group); 705 goto reject; 706 } 707 if (pwd->pw_uid) { 708 if (sep->se_group) 709 pwd->pw_gid = grp->gr_gid; 710 if (setgid(pwd->pw_gid) < 0) { 711 syslog(LOG_ERR, 712 "%s/%s: can't set gid %d: %m", sep->se_service, 713 sep->se_proto, pwd->pw_gid); 714 goto reject; 715 } 716 (void) initgroups(pwd->pw_name, 717 pwd->pw_gid); 718 if (setuid(pwd->pw_uid) < 0) { 719 syslog(LOG_ERR, 720 "%s/%s: can't set uid %d: %m", sep->se_service, 721 sep->se_proto, pwd->pw_uid); 722 goto reject; 723 } 724 } else if (sep->se_group) { 725 (void) setgid((gid_t)grp->gr_gid); 726 } 727 if (debug) 728 fprintf(stderr, "%d execl %s\n", 729 getpid(), sep->se_server); 730 #ifdef MULOG 731 if (sep->se_log) 732 dolog(sep, ctrl); 733 #endif 734 /* Set our control descriptor to not close-on-exec... */ 735 if (fcntl(ctrl, F_SETFD, 0) < 0) 736 syslog(LOG_ERR, "fcntl (F_SETFD, 0): %m"); 737 /* ...and dup it to stdin, stdout, and stderr. */ 738 if (ctrl != 0) { 739 dup2(ctrl, 0); 740 close(ctrl); 741 ctrl = 0; 742 } 743 dup2(0, 1); 744 dup2(0, 2); 745 #ifdef RLIMIT_NOFILE 746 if (rlim_ofile.rlim_cur != rlim_ofile_cur && 747 setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) 748 syslog(LOG_ERR, "setrlimit: %m"); 749 #endif 750 execv(sep->se_server, sep->se_argv); 751 syslog(LOG_ERR, "cannot execute %s: %m", sep->se_server); 752 reject: 753 if (sep->se_socktype != SOCK_STREAM) 754 recv(ctrl, buf, sizeof (buf), 0); 755 _exit(1); 756 } 757 } 758 759 static void 760 reapchild(void) 761 { 762 int status; 763 pid_t pid; 764 struct servtab *sep; 765 766 for (;;) { 767 pid = wait3(&status, WNOHANG, NULL); 768 if (pid <= 0) 769 break; 770 if (debug) 771 (void) fprintf(stderr, "%d reaped, status %#x\n", 772 pid, status); 773 for (sep = servtab; sep != NULL; sep = sep->se_next) 774 if (sep->se_wait == pid) { 775 struct kevent *ev; 776 777 if (WIFEXITED(status) && WEXITSTATUS(status)) 778 syslog(LOG_WARNING, 779 "%s: exit status 0x%x", 780 sep->se_server, WEXITSTATUS(status)); 781 else if (WIFSIGNALED(status)) 782 syslog(LOG_WARNING, 783 "%s: exit signal 0x%x", 784 sep->se_server, WTERMSIG(status)); 785 sep->se_wait = 1; 786 ev = allocchange(); 787 EV_SET(ev, sep->se_fd, EVFILT_READ, 788 EV_ADD | EV_ENABLE, 0, 0, (intptr_t)sep); 789 if (debug) 790 fprintf(stderr, "restored %s, fd %d\n", 791 sep->se_service, sep->se_fd); 792 } 793 } 794 } 795 796 static void 797 config(void) 798 { 799 struct servtab *sep, *cp, **sepp; 800 int n; 801 802 if (!setconfig()) { 803 syslog(LOG_ERR, "%s: %m", CONFIG); 804 return; 805 } 806 for (sep = servtab; sep != NULL; sep = sep->se_next) 807 sep->se_checked = 0; 808 while ((cp = getconfigent())) { 809 for (sep = servtab; sep != NULL; sep = sep->se_next) 810 if (strcmp(sep->se_service, cp->se_service) == 0 && 811 strcmp(sep->se_hostaddr, cp->se_hostaddr) == 0 && 812 strcmp(sep->se_proto, cp->se_proto) == 0 && 813 ISMUX(sep) == ISMUX(cp)) 814 break; 815 if (sep != NULL) { 816 int i; 817 818 #define SWAP(type, a, b) {type c=(type)a; (type)a=(type)b; (type)b=(type)c;} 819 820 /* 821 * sep->se_wait may be holding the pid of a daemon 822 * that we're waiting for. If so, don't overwrite 823 * it unless the config file explicitly says don't 824 * wait. 825 */ 826 if (cp->se_bi == 0 && 827 (sep->se_wait == 1 || cp->se_wait == 0)) 828 sep->se_wait = cp->se_wait; 829 SWAP(char *, sep->se_user, cp->se_user); 830 SWAP(char *, sep->se_group, cp->se_group); 831 SWAP(char *, sep->se_server, cp->se_server); 832 for (i = 0; i < MAXARGV; i++) 833 SWAP(char *, sep->se_argv[i], cp->se_argv[i]); 834 #ifdef IPSEC 835 SWAP(char *, sep->se_policy, cp->se_policy); 836 #endif 837 SWAP(int, cp->se_type, sep->se_type); 838 SWAP(int, cp->se_max, sep->se_max); 839 #undef SWAP 840 if (isrpcservice(sep)) 841 unregister_rpc(sep); 842 sep->se_rpcversl = cp->se_rpcversl; 843 sep->se_rpcversh = cp->se_rpcversh; 844 freeconfig(cp); 845 if (debug) 846 print_service("REDO", sep); 847 } else { 848 sep = enter(cp); 849 if (debug) 850 print_service("ADD ", sep); 851 } 852 sep->se_checked = 1; 853 854 switch (sep->se_family) { 855 case AF_LOCAL: 856 if (sep->se_fd != -1) 857 break; 858 n = strlen(sep->se_service); 859 if (n > sizeof(sep->se_ctrladdr_un.sun_path)) { 860 syslog(LOG_ERR, "%s: address too long", 861 sep->se_service); 862 sep->se_checked = 0; 863 continue; 864 } 865 (void)unlink(sep->se_service); 866 strncpy(sep->se_ctrladdr_un.sun_path, 867 sep->se_service, n); 868 sep->se_ctrladdr_un.sun_family = AF_LOCAL; 869 sep->se_ctrladdr_size = n + 870 sizeof(sep->se_ctrladdr_un) - 871 sizeof(sep->se_ctrladdr_un.sun_path); 872 if (!ISMUX(sep)) 873 setup(sep); 874 break; 875 case AF_INET: 876 #ifdef INET6 877 case AF_INET6: 878 #endif 879 { 880 struct addrinfo hints, *res; 881 char *host, *port; 882 int error; 883 int s; 884 885 /* check if the family is supported */ 886 s = socket(sep->se_family, SOCK_DGRAM, 0); 887 if (s < 0) { 888 syslog(LOG_WARNING, 889 "%s/%s: %s: the address family is not " 890 "supported by the kernel", 891 sep->se_service, sep->se_proto, 892 sep->se_hostaddr); 893 sep->se_checked = 0; 894 continue; 895 } 896 close(s); 897 898 memset(&hints, 0, sizeof(hints)); 899 hints.ai_family = sep->se_family; 900 hints.ai_socktype = sep->se_socktype; 901 hints.ai_flags = AI_PASSIVE; 902 if (!strcmp(sep->se_hostaddr, "*")) 903 host = NULL; 904 else 905 host = sep->se_hostaddr; 906 if (isrpcservice(sep) || ISMUX(sep)) 907 port = "0"; 908 else 909 port = sep->se_service; 910 error = getaddrinfo(host, port, &hints, &res); 911 if (error) { 912 if (error == EAI_SERVICE) { 913 /* gai_strerror not friendly enough */ 914 syslog(LOG_WARNING, "%s/%s: " 915 "unknown service", 916 sep->se_service, sep->se_proto); 917 } else { 918 syslog(LOG_ERR, "%s/%s: %s: %s", 919 sep->se_service, sep->se_proto, 920 sep->se_hostaddr, 921 gai_strerror(error)); 922 } 923 sep->se_checked = 0; 924 continue; 925 } 926 if (res->ai_next) { 927 syslog(LOG_ERR, 928 "%s/%s: %s: resolved to multiple addr", 929 sep->se_service, sep->se_proto, 930 sep->se_hostaddr); 931 sep->se_checked = 0; 932 freeaddrinfo(res); 933 continue; 934 } 935 memcpy(&sep->se_ctrladdr, res->ai_addr, 936 res->ai_addrlen); 937 if (ISMUX(sep)) { 938 sep->se_fd = -1; 939 freeaddrinfo(res); 940 continue; 941 } 942 sep->se_ctrladdr_size = res->ai_addrlen; 943 freeaddrinfo(res); 944 #ifdef RPC 945 if (isrpcservice(sep)) { 946 struct rpcent *rp; 947 948 sep->se_rpcprog = atoi(sep->se_service); 949 if (sep->se_rpcprog == 0) { 950 rp = getrpcbyname(sep->se_service); 951 if (rp == 0) { 952 syslog(LOG_ERR, 953 "%s/%s: unknown service", 954 sep->se_service, 955 sep->se_proto); 956 sep->se_checked = 0; 957 continue; 958 } 959 sep->se_rpcprog = rp->r_number; 960 } 961 if (sep->se_fd == -1 && !ISMUX(sep)) 962 setup(sep); 963 if (sep->se_fd != -1) 964 register_rpc(sep); 965 } else 966 #endif 967 { 968 if (sep->se_fd >= 0) 969 close_sep(sep); 970 if (sep->se_fd == -1 && !ISMUX(sep)) 971 setup(sep); 972 } 973 } 974 } 975 } 976 endconfig(); 977 /* 978 * Purge anything not looked at above. 979 */ 980 sepp = &servtab; 981 while ((sep = *sepp)) { 982 if (sep->se_checked) { 983 sepp = &sep->se_next; 984 continue; 985 } 986 *sepp = sep->se_next; 987 if (sep->se_fd >= 0) 988 close_sep(sep); 989 if (isrpcservice(sep)) 990 unregister_rpc(sep); 991 if (sep->se_family == AF_LOCAL) 992 (void)unlink(sep->se_service); 993 if (debug) 994 print_service("FREE", sep); 995 freeconfig(sep); 996 free(sep); 997 } 998 } 999 1000 static void 1001 retry(void) 1002 { 1003 struct servtab *sep; 1004 1005 timingout = 0; 1006 for (sep = servtab; sep != NULL; sep = sep->se_next) { 1007 if (sep->se_fd == -1 && !ISMUX(sep)) { 1008 switch (sep->se_family) { 1009 case AF_LOCAL: 1010 case AF_INET: 1011 #ifdef INET6 1012 case AF_INET6: 1013 #endif 1014 setup(sep); 1015 if (sep->se_fd != -1 && isrpcservice(sep)) 1016 register_rpc(sep); 1017 break; 1018 } 1019 } 1020 } 1021 } 1022 1023 static void 1024 goaway(void) 1025 { 1026 struct servtab *sep; 1027 1028 for (sep = servtab; sep != NULL; sep = sep->se_next) { 1029 if (sep->se_fd == -1) 1030 continue; 1031 1032 switch (sep->se_family) { 1033 case AF_LOCAL: 1034 (void)unlink(sep->se_service); 1035 break; 1036 case AF_INET: 1037 #ifdef INET6 1038 case AF_INET6: 1039 #endif 1040 if (sep->se_wait == 1 && isrpcservice(sep)) 1041 unregister_rpc(sep); 1042 break; 1043 } 1044 (void)close(sep->se_fd); 1045 } 1046 exit(0); 1047 } 1048 1049 static void 1050 setup(struct servtab *sep) 1051 { 1052 int on = 1, off = 0; 1053 struct kevent *ev; 1054 1055 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) { 1056 if (debug) 1057 fprintf(stderr, "socket failed on %s/%s: %s\n", 1058 sep->se_service, sep->se_proto, strerror(errno)); 1059 syslog(LOG_ERR, "%s/%s: socket: %m", 1060 sep->se_service, sep->se_proto); 1061 return; 1062 } 1063 /* Set all listening sockets to close-on-exec. */ 1064 if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) { 1065 syslog(LOG_ERR, "%s/%s: fcntl(F_SETFD, FD_CLOEXEC): %m", 1066 sep->se_service, sep->se_proto); 1067 close(sep->se_fd); 1068 return; 1069 } 1070 1071 #define turnon(fd, opt) \ 1072 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 1073 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 1074 turnon(sep->se_fd, SO_DEBUG) < 0) 1075 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 1076 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 1077 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 1078 #undef turnon 1079 1080 /* Set the socket buffer sizes, if specified. */ 1081 if (sep->se_sndbuf != 0 && setsockopt(sep->se_fd, SOL_SOCKET, 1082 SO_SNDBUF, (char *)&sep->se_sndbuf, sizeof(sep->se_sndbuf)) < 0) 1083 syslog(LOG_ERR, "setsockopt (SO_SNDBUF %d): %m", 1084 sep->se_sndbuf); 1085 if (sep->se_rcvbuf != 0 && setsockopt(sep->se_fd, SOL_SOCKET, 1086 SO_RCVBUF, (char *)&sep->se_rcvbuf, sizeof(sep->se_rcvbuf)) < 0) 1087 syslog(LOG_ERR, "setsockopt (SO_RCVBUF %d): %m", 1088 sep->se_rcvbuf); 1089 #ifdef INET6 1090 if (sep->se_family == AF_INET6) { 1091 int *v; 1092 v = (sep->se_type == FAITH_TYPE) ? &on : &off; 1093 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_FAITH, 1094 (char *)v, sizeof(*v)) < 0) 1095 syslog(LOG_ERR, "setsockopt (IPV6_FAITH): %m"); 1096 } 1097 #endif 1098 #ifdef IPSEC 1099 if (ipsecsetup(sep->se_family, sep->se_fd, sep->se_policy) < 0 && 1100 sep->se_policy) { 1101 syslog(LOG_ERR, "%s/%s: ipsec setup failed", 1102 sep->se_service, sep->se_proto); 1103 (void)close(sep->se_fd); 1104 sep->se_fd = -1; 1105 return; 1106 } 1107 #endif 1108 1109 if (bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size) < 0) { 1110 if (debug) 1111 fprintf(stderr, "bind failed on %s/%s: %s\n", 1112 sep->se_service, sep->se_proto, strerror(errno)); 1113 syslog(LOG_ERR, "%s/%s: bind: %m", 1114 sep->se_service, sep->se_proto); 1115 (void) close(sep->se_fd); 1116 sep->se_fd = -1; 1117 if (!timingout) { 1118 timingout = 1; 1119 alarm(RETRYTIME); 1120 } 1121 return; 1122 } 1123 if (sep->se_socktype == SOCK_STREAM) 1124 listen(sep->se_fd, 10); 1125 1126 ev = allocchange(); 1127 EV_SET(ev, sep->se_fd, EVFILT_READ, EV_ADD | EV_ENABLE, 0, 0, 1128 (intptr_t)sep); 1129 if (sep->se_fd > maxsock) { 1130 maxsock = sep->se_fd; 1131 if (maxsock > rlim_ofile_cur - FD_MARGIN) 1132 bump_nofile(); 1133 } 1134 if (debug) 1135 fprintf(stderr, "registered %s on %d\n", 1136 sep->se_server, sep->se_fd); 1137 } 1138 1139 /* 1140 * Finish with a service and its socket. 1141 */ 1142 static void 1143 close_sep(struct servtab *sep) 1144 { 1145 if (sep->se_fd >= 0) { 1146 (void) close(sep->se_fd); 1147 sep->se_fd = -1; 1148 } 1149 sep->se_count = 0; 1150 } 1151 1152 static void 1153 register_rpc(struct servtab *sep) 1154 { 1155 #ifdef RPC 1156 int n; 1157 struct netbuf nbuf; 1158 struct sockaddr_storage ss; 1159 struct netconfig *nconf; 1160 1161 if ((nconf = getnetconfigent(sep->se_proto+4)) == NULL) { 1162 syslog(LOG_ERR, "%s: getnetconfigent failed", 1163 sep->se_proto); 1164 return; 1165 } 1166 n = sizeof ss; 1167 if (getsockname(sep->se_fd, (struct sockaddr *)&ss, &n) < 0) { 1168 syslog(LOG_ERR, "%s/%s: getsockname: %m", 1169 sep->se_service, sep->se_proto); 1170 return; 1171 } 1172 1173 nbuf.buf = &ss; 1174 nbuf.len = ss.ss_len; 1175 nbuf.maxlen = sizeof (struct sockaddr_storage); 1176 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1177 if (debug) 1178 fprintf(stderr, "rpcb_set: %u %d %s %s\n", 1179 sep->se_rpcprog, n, nconf->nc_netid, 1180 taddr2uaddr(nconf, &nbuf)); 1181 (void)rpcb_unset(sep->se_rpcprog, n, nconf); 1182 if (!rpcb_set(sep->se_rpcprog, n, nconf, &nbuf)) 1183 syslog(LOG_ERR, "rpcb_set: %u %d %s %s%s", 1184 sep->se_rpcprog, n, nconf->nc_netid, 1185 taddr2uaddr(nconf, &nbuf), clnt_spcreateerror("")); 1186 } 1187 #endif /* RPC */ 1188 } 1189 1190 static void 1191 unregister_rpc(struct servtab *sep) 1192 { 1193 #ifdef RPC 1194 int n; 1195 struct netconfig *nconf; 1196 1197 if ((nconf = getnetconfigent(sep->se_proto+4)) == NULL) { 1198 syslog(LOG_ERR, "%s: getnetconfigent failed", 1199 sep->se_proto); 1200 return; 1201 } 1202 1203 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1204 if (debug) 1205 fprintf(stderr, "rpcb_unset(%u, %d, %s)\n", 1206 sep->se_rpcprog, n, nconf->nc_netid); 1207 if (!rpcb_unset(sep->se_rpcprog, n, nconf)) 1208 syslog(LOG_ERR, "rpcb_unset(%u, %d, %s) failed\n", 1209 sep->se_rpcprog, n, nconf->nc_netid); 1210 } 1211 #endif /* RPC */ 1212 } 1213 1214 1215 static struct servtab * 1216 enter(struct servtab *cp) 1217 { 1218 struct servtab *sep; 1219 1220 sep = (struct servtab *)malloc(sizeof (*sep)); 1221 if (sep == NULL) { 1222 syslog(LOG_ERR, "Out of memory."); 1223 exit(1); 1224 } 1225 *sep = *cp; 1226 sep->se_fd = -1; 1227 sep->se_rpcprog = -1; 1228 sep->se_next = servtab; 1229 servtab = sep; 1230 return (sep); 1231 } 1232 1233 FILE *fconfig = NULL; 1234 struct servtab serv; 1235 char line[LINE_MAX]; 1236 char *defhost; 1237 #ifdef IPSEC 1238 static char *policy = NULL; 1239 #endif 1240 1241 static int 1242 setconfig(void) 1243 { 1244 if (defhost) 1245 free(defhost); 1246 defhost = newstr("*"); 1247 #ifdef IPSEC 1248 if (policy) 1249 free(policy); 1250 policy = NULL; 1251 #endif 1252 if (fconfig != NULL) { 1253 fseek(fconfig, 0L, SEEK_SET); 1254 return (1); 1255 } 1256 fconfig = fopen(CONFIG, "r"); 1257 return (fconfig != NULL); 1258 } 1259 1260 static void 1261 endconfig(void) 1262 { 1263 if (fconfig != NULL) { 1264 (void) fclose(fconfig); 1265 fconfig = NULL; 1266 } 1267 if (defhost != NULL) { 1268 free(defhost); 1269 defhost = NULL; 1270 } 1271 } 1272 1273 static struct servtab * 1274 getconfigent(void) 1275 { 1276 struct servtab *sep = &serv; 1277 int argc, val; 1278 char *cp, *cp0, *arg, *buf0, *buf1, *sz0, *sz1; 1279 static char TCPMUX_TOKEN[] = "tcpmux/"; 1280 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) 1281 char *hostdelim; 1282 1283 more: 1284 while ((cp = nextline(fconfig))) { 1285 #ifdef IPSEC 1286 /* lines starting with #@ is not a comment, but the policy */ 1287 if (cp[0] == '#' && cp[1] == '@') { 1288 char *p; 1289 for (p = cp + 2; p && *p && isspace(*p); p++) 1290 ; 1291 if (*p == '\0') { 1292 if (policy) 1293 free(policy); 1294 policy = NULL; 1295 } else { 1296 if (ipsecsetup_test(p) < 0) { 1297 syslog(LOG_ERR, 1298 "%s: invalid ipsec policy \"%s\"", 1299 CONFIG, p); 1300 exit(1); 1301 } else { 1302 if (policy) 1303 free(policy); 1304 policy = newstr(p); 1305 } 1306 } 1307 } 1308 #endif 1309 if (*cp == '#' || *cp == '\0') 1310 continue; 1311 #ifdef MULOG 1312 /* Avoid use of `skip' if there is a danger of it looking 1313 * at continuation lines. 1314 */ 1315 do { 1316 cp++; 1317 } while (*cp == ' ' || *cp == '\t'); 1318 if (*cp == '\0') 1319 continue; 1320 if ((arg = skip(&cp)) == NULL) 1321 continue; 1322 if (strcmp(arg, "DOMAIN")) 1323 continue; 1324 if (curdom) 1325 free(curdom); 1326 curdom = NULL; 1327 while (*cp == ' ' || *cp == '\t') 1328 cp++; 1329 if (*cp == '\0') 1330 continue; 1331 arg = cp; 1332 while (*cp && *cp != ' ' && *cp != '\t') 1333 cp++; 1334 if (*cp != '\0') 1335 *cp++ = '\0'; 1336 curdom = newstr(arg); 1337 #endif 1338 break; 1339 } 1340 if (cp == NULL) 1341 return (NULL); 1342 /* 1343 * clear the static buffer, since some fields (se_ctrladdr, 1344 * for example) don't get initialized here. 1345 */ 1346 memset((caddr_t)sep, 0, sizeof *sep); 1347 arg = skip(&cp); 1348 if (cp == NULL) { 1349 /* got an empty line containing just blanks/tabs. */ 1350 goto more; 1351 } 1352 /* Check for a host name. */ 1353 hostdelim = strrchr(arg, ':'); 1354 if (hostdelim) { 1355 *hostdelim = '\0'; 1356 if (arg[0] == '[' && hostdelim > arg && hostdelim[-1] == ']') { 1357 hostdelim[-1] = '\0'; 1358 sep->se_hostaddr = newstr(arg + 1); 1359 } else 1360 sep->se_hostaddr = newstr(arg); 1361 arg = hostdelim + 1; 1362 /* 1363 * If the line is of the form `host:', then just change the 1364 * default host for the following lines. 1365 */ 1366 if (*arg == '\0') { 1367 arg = skip(&cp); 1368 if (cp == NULL) { 1369 free(defhost); 1370 defhost = sep->se_hostaddr; 1371 goto more; 1372 } 1373 } 1374 } else 1375 sep->se_hostaddr = newstr(defhost); 1376 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1377 char *c = arg + MUX_LEN; 1378 if (*c == '+') { 1379 sep->se_type = MUXPLUS_TYPE; 1380 c++; 1381 } else 1382 sep->se_type = MUX_TYPE; 1383 sep->se_service = newstr(c); 1384 } else { 1385 sep->se_service = newstr(arg); 1386 sep->se_type = NORM_TYPE; 1387 } 1388 1389 arg = sskip(&cp); 1390 if (strcmp(arg, "stream") == 0) 1391 sep->se_socktype = SOCK_STREAM; 1392 else if (strcmp(arg, "dgram") == 0) 1393 sep->se_socktype = SOCK_DGRAM; 1394 else if (strcmp(arg, "rdm") == 0) 1395 sep->se_socktype = SOCK_RDM; 1396 else if (strcmp(arg, "seqpacket") == 0) 1397 sep->se_socktype = SOCK_SEQPACKET; 1398 else if (strcmp(arg, "raw") == 0) 1399 sep->se_socktype = SOCK_RAW; 1400 else 1401 sep->se_socktype = -1; 1402 1403 arg = sskip(&cp); 1404 if (sep->se_type == NORM_TYPE && 1405 strncmp(arg, "faith/", strlen("faith/")) == 0) { 1406 arg += strlen("faith/"); 1407 sep->se_type = FAITH_TYPE; 1408 } 1409 sep->se_proto = newstr(arg); 1410 1411 #define MALFORMED(arg) \ 1412 do { \ 1413 syslog(LOG_ERR, "%s: malformed buffer size option `%s'", \ 1414 sep->se_service, (arg)); \ 1415 goto more; \ 1416 } while (0) 1417 1418 #define GETVAL(arg) \ 1419 do { \ 1420 if (!isdigit(*(arg))) \ 1421 MALFORMED(arg); \ 1422 val = strtol((arg), &cp0, 10); \ 1423 if (cp0 != NULL) { \ 1424 if (cp0[1] != '\0') \ 1425 MALFORMED((arg)); \ 1426 if (cp0[0] == 'k') \ 1427 val *= 1024; \ 1428 if (cp0[0] == 'm') \ 1429 val *= 1024 * 1024; \ 1430 } \ 1431 if (val < 1) { \ 1432 syslog(LOG_ERR, "%s: invalid buffer size `%s'", \ 1433 sep->se_service, (arg)); \ 1434 goto more; \ 1435 } \ 1436 } while (0) 1437 1438 #define ASSIGN(arg) \ 1439 do { \ 1440 if (strcmp((arg), "sndbuf") == 0) \ 1441 sep->se_sndbuf = val; \ 1442 else if (strcmp((arg), "rcvbuf") == 0) \ 1443 sep->se_rcvbuf = val; \ 1444 else \ 1445 MALFORMED((arg)); \ 1446 } while (0) 1447 1448 /* 1449 * Extract the send and receive buffer sizes before parsing 1450 * the protocol. 1451 */ 1452 sep->se_sndbuf = sep->se_rcvbuf = 0; 1453 buf0 = buf1 = sz0 = sz1 = NULL; 1454 if ((buf0 = strchr(sep->se_proto, ',')) != NULL) { 1455 /* Not meaningful for Tcpmux services. */ 1456 if (ISMUX(sep)) { 1457 syslog(LOG_ERR, "%s: can't specify buffer sizes for " 1458 "tcpmux services", sep->se_service); 1459 goto more; 1460 } 1461 1462 /* Skip the , */ 1463 *buf0++ = '\0'; 1464 1465 /* Check to see if another socket buffer size was specified. */ 1466 if ((buf1 = strchr(buf0, ',')) != NULL) { 1467 /* Skip the , */ 1468 *buf1++ = '\0'; 1469 1470 /* Make sure a 3rd one wasn't specified. */ 1471 if (strchr(buf1, ',') != NULL) { 1472 syslog(LOG_ERR, "%s: too many buffer sizes", 1473 sep->se_service); 1474 goto more; 1475 } 1476 1477 /* Locate the size. */ 1478 if ((sz1 = strchr(buf1, '=')) == NULL) 1479 MALFORMED(buf1); 1480 1481 /* Skip the = */ 1482 *sz1++ = '\0'; 1483 } 1484 1485 /* Locate the size. */ 1486 if ((sz0 = strchr(buf0, '=')) == NULL) 1487 MALFORMED(buf0); 1488 1489 /* Skip the = */ 1490 *sz0++ = '\0'; 1491 1492 GETVAL(sz0); 1493 ASSIGN(buf0); 1494 1495 if (buf1 != NULL) { 1496 GETVAL(sz1); 1497 ASSIGN(buf1); 1498 } 1499 } 1500 1501 #undef ASSIGN 1502 #undef GETVAL 1503 #undef MALFORMED 1504 1505 if (strcmp(sep->se_proto, "unix") == 0) { 1506 sep->se_family = AF_LOCAL; 1507 } else { 1508 val = strlen(sep->se_proto); 1509 if (!val) { 1510 syslog(LOG_ERR, "%s: invalid protocol specified", 1511 sep->se_service); 1512 goto more; 1513 } 1514 val = sep->se_proto[val - 1]; 1515 switch (val) { 1516 case '4': /*tcp4 or udp4*/ 1517 sep->se_family = AF_INET; 1518 break; 1519 #ifdef INET6 1520 case '6': /*tcp6 or udp6*/ 1521 sep->se_family = AF_INET6; 1522 break; 1523 #endif 1524 default: 1525 sep->se_family = AF_INET; /*will become AF_INET6*/ 1526 break; 1527 } 1528 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1529 #ifdef RPC 1530 char *cp, *ccp; 1531 cp = strchr(sep->se_service, '/'); 1532 if (cp == 0) { 1533 syslog(LOG_ERR, "%s: no rpc version", 1534 sep->se_service); 1535 goto more; 1536 } 1537 *cp++ = '\0'; 1538 sep->se_rpcversl = sep->se_rpcversh = 1539 strtol(cp, &ccp, 0); 1540 if (ccp == cp) { 1541 badafterall: 1542 syslog(LOG_ERR, "%s/%s: bad rpc version", 1543 sep->se_service, cp); 1544 goto more; 1545 } 1546 if (*ccp == '-') { 1547 cp = ccp + 1; 1548 sep->se_rpcversh = strtol(cp, &ccp, 0); 1549 if (ccp == cp) 1550 goto badafterall; 1551 } 1552 #else 1553 syslog(LOG_ERR, "%s: rpc services not suported", 1554 sep->se_service); 1555 goto more; 1556 #endif /* RPC */ 1557 } 1558 } 1559 arg = sskip(&cp); 1560 { 1561 char *cp; 1562 if ((cp = strchr(arg, ':')) == NULL) 1563 cp = strchr(arg, '.'); 1564 if (cp != NULL) { 1565 *cp++ = '\0'; 1566 sep->se_max = atoi(cp); 1567 } else 1568 sep->se_max = TOOMANY; 1569 } 1570 sep->se_wait = strcmp(arg, "wait") == 0; 1571 if (ISMUX(sep)) { 1572 /* 1573 * Silently enforce "nowait" for TCPMUX services since 1574 * they don't have an assigned port to listen on. 1575 */ 1576 sep->se_wait = 0; 1577 1578 if (strncmp(sep->se_proto, "tcp", 3)) { 1579 syslog(LOG_ERR, 1580 "%s: bad protocol for tcpmux service %s", 1581 CONFIG, sep->se_service); 1582 goto more; 1583 } 1584 if (sep->se_socktype != SOCK_STREAM) { 1585 syslog(LOG_ERR, 1586 "%s: bad socket type for tcpmux service %s", 1587 CONFIG, sep->se_service); 1588 goto more; 1589 } 1590 } 1591 sep->se_user = newstr(sskip(&cp)); 1592 if ((sep->se_group = strchr(sep->se_user, ':')) != NULL) 1593 *sep->se_group++ = '\0'; 1594 else if ((sep->se_group = strchr(sep->se_user, '.')) != NULL) 1595 *sep->se_group++ = '\0'; 1596 1597 sep->se_server = newstr(sskip(&cp)); 1598 if (strcmp(sep->se_server, "internal") == 0) { 1599 struct biltin *bi; 1600 1601 for (bi = biltins; bi->bi_service; bi++) 1602 if (bi->bi_socktype == sep->se_socktype && 1603 strcmp(bi->bi_service, sep->se_service) == 0) 1604 break; 1605 if (bi->bi_service == 0) { 1606 syslog(LOG_ERR, "internal service %s unknown", 1607 sep->se_service); 1608 goto more; 1609 } 1610 sep->se_bi = bi; 1611 sep->se_wait = bi->bi_wait; 1612 } else 1613 sep->se_bi = NULL; 1614 argc = 0; 1615 for (arg = skip(&cp); cp; arg = skip(&cp)) { 1616 #if MULOG 1617 char *colon; 1618 1619 if (argc == 0 && (colon = strrchr(arg, ':'))) { 1620 while (arg < colon) { 1621 int x; 1622 char *ccp; 1623 1624 switch (*arg++) { 1625 case 'l': 1626 x = 1; 1627 if (isdigit(*arg)) { 1628 x = strtol(arg, &ccp, 0); 1629 if (ccp == arg) 1630 break; 1631 arg = ccp; 1632 } 1633 sep->se_log &= ~MULOG_RFC931; 1634 sep->se_log |= x; 1635 break; 1636 case 'a': 1637 sep->se_log |= MULOG_RFC931; 1638 break; 1639 default: 1640 break; 1641 } 1642 } 1643 arg = colon + 1; 1644 } 1645 #endif 1646 if (argc < MAXARGV) 1647 sep->se_argv[argc++] = newstr(arg); 1648 } 1649 while (argc <= MAXARGV) 1650 sep->se_argv[argc++] = NULL; 1651 #ifdef IPSEC 1652 sep->se_policy = policy ? newstr(policy) : NULL; 1653 #endif 1654 return (sep); 1655 } 1656 1657 static void 1658 freeconfig(struct servtab *cp) 1659 { 1660 int i; 1661 1662 if (cp->se_hostaddr) 1663 free(cp->se_hostaddr); 1664 if (cp->se_service) 1665 free(cp->se_service); 1666 if (cp->se_proto) 1667 free(cp->se_proto); 1668 if (cp->se_user) 1669 free(cp->se_user); 1670 /* Note: se_group is part of the newstr'ed se_user */ 1671 if (cp->se_server) 1672 free(cp->se_server); 1673 for (i = 0; i < MAXARGV; i++) 1674 if (cp->se_argv[i]) 1675 free(cp->se_argv[i]); 1676 #ifdef IPSEC 1677 if (cp->se_policy) 1678 free(cp->se_policy); 1679 #endif 1680 } 1681 1682 1683 /* 1684 * Safe skip - if skip returns null, log a syntax error in the 1685 * configuration file and exit. 1686 */ 1687 static char * 1688 sskip(char **cpp) 1689 { 1690 char *cp; 1691 1692 cp = skip(cpp); 1693 if (cp == NULL) { 1694 syslog(LOG_ERR, "%s: syntax error", CONFIG); 1695 exit(1); 1696 } 1697 return (cp); 1698 } 1699 1700 static char * 1701 skip(char **cpp) 1702 { 1703 char *cp = *cpp; 1704 char *start; 1705 char quote; 1706 1707 if (*cpp == NULL) 1708 return (NULL); 1709 1710 again: 1711 while (*cp == ' ' || *cp == '\t') 1712 cp++; 1713 if (*cp == '\0') { 1714 int c; 1715 1716 c = getc(fconfig); 1717 (void) ungetc(c, fconfig); 1718 if (c == ' ' || c == '\t') 1719 if ((cp = nextline(fconfig))) 1720 goto again; 1721 *cpp = NULL; 1722 return (NULL); 1723 } 1724 start = cp; 1725 quote = '\0'; 1726 while (*cp && (quote || (*cp != ' ' && *cp != '\t'))) { 1727 if (*cp == '\'' || *cp == '"') { 1728 if (quote && *cp != quote) 1729 cp++; 1730 else { 1731 if (quote) 1732 quote = '\0'; 1733 else 1734 quote = *cp; 1735 memmove(cp, cp+1, strlen(cp)); 1736 } 1737 } else 1738 cp++; 1739 } 1740 if (*cp != '\0') 1741 *cp++ = '\0'; 1742 *cpp = cp; 1743 return (start); 1744 } 1745 1746 static char * 1747 nextline(FILE *fd) 1748 { 1749 char *cp; 1750 1751 if (fgets(line, sizeof (line), fd) == NULL) 1752 return (NULL); 1753 cp = strchr(line, '\n'); 1754 if (cp) 1755 *cp = '\0'; 1756 return (line); 1757 } 1758 1759 static char * 1760 newstr(char *cp) 1761 { 1762 if ((cp = strdup((cp !=NULL )? cp : "")) != NULL) 1763 return (cp); 1764 syslog(LOG_ERR, "strdup: %m"); 1765 exit(1); 1766 } 1767 1768 static void 1769 inetd_setproctitle(char *a, int s) 1770 { 1771 socklen_t size; 1772 struct sockaddr_storage ss; 1773 char hbuf[NI_MAXHOST]; 1774 1775 size = sizeof(ss); 1776 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) { 1777 if (getnameinfo((struct sockaddr *)&ss, size, hbuf, 1778 sizeof(hbuf), NULL, 0, niflags) == 0) 1779 setproctitle("-%s [%s]", a, hbuf); 1780 else 1781 setproctitle("-%s [?]", a); 1782 } else 1783 setproctitle("-%s", a); 1784 } 1785 1786 static void 1787 bump_nofile(void) 1788 { 1789 #ifdef RLIMIT_NOFILE 1790 1791 #define FD_CHUNK 32 1792 1793 struct rlimit rl; 1794 1795 if (getrlimit(RLIMIT_NOFILE, &rl) < 0) { 1796 syslog(LOG_ERR, "getrlimit: %m"); 1797 return; 1798 } 1799 rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK); 1800 if (rl.rlim_cur <= rlim_ofile_cur) { 1801 syslog(LOG_ERR, 1802 "bump_nofile: cannot extend file limit, max = %d", 1803 (int)rl.rlim_cur); 1804 return; 1805 } 1806 1807 if (setrlimit(RLIMIT_NOFILE, &rl) < 0) { 1808 syslog(LOG_ERR, "setrlimit: %m"); 1809 return; 1810 } 1811 1812 rlim_ofile_cur = rl.rlim_cur; 1813 return; 1814 1815 #else 1816 syslog(LOG_ERR, "bump_nofile: cannot extend file limit"); 1817 return; 1818 #endif 1819 } 1820 1821 /* 1822 * Internet services provided internally by inetd: 1823 */ 1824 #define BUFSIZE 4096 1825 1826 /* ARGSUSED */ 1827 static void 1828 echo_stream(int s, struct servtab *sep) /* Echo service -- echo data back */ 1829 { 1830 char buffer[BUFSIZE]; 1831 int i; 1832 1833 inetd_setproctitle(sep->se_service, s); 1834 while ((i = read(s, buffer, sizeof(buffer))) > 0 && 1835 write(s, buffer, i) > 0) 1836 ; 1837 } 1838 1839 /* ARGSUSED */ 1840 static void 1841 echo_dg(int s, struct servtab *sep) /* Echo service -- echo data back */ 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 static void 1859 discard_stream(int s, struct servtab *sep) /* Discard service -- ignore data */ 1860 { 1861 char buffer[BUFSIZE]; 1862 1863 inetd_setproctitle(sep->se_service, s); 1864 while ((errno = 0, read(s, buffer, sizeof(buffer)) > 0) || 1865 errno == EINTR) 1866 ; 1867 } 1868 1869 /* ARGSUSED */ 1870 static void 1871 discard_dg(int s, struct servtab *sep) /* Discard service -- ignore data */ 1872 1873 { 1874 char buffer[BUFSIZE]; 1875 1876 (void) read(s, buffer, sizeof(buffer)); 1877 } 1878 1879 #include <ctype.h> 1880 #define LINESIZ 72 1881 char ring[128]; 1882 char *endring; 1883 1884 static void 1885 initring(void) 1886 { 1887 int i; 1888 1889 endring = ring; 1890 1891 for (i = 0; i <= 128; ++i) 1892 if (isprint(i)) 1893 *endring++ = i; 1894 } 1895 1896 /* ARGSUSED */ 1897 static void 1898 chargen_stream(int s,struct servtab *sep) /* Character generator */ 1899 { 1900 int len; 1901 char *rs, text[LINESIZ+2]; 1902 1903 inetd_setproctitle(sep->se_service, s); 1904 1905 if (!endring) { 1906 initring(); 1907 rs = ring; 1908 } 1909 1910 text[LINESIZ] = '\r'; 1911 text[LINESIZ + 1] = '\n'; 1912 for (rs = ring;;) { 1913 if ((len = endring - rs) >= LINESIZ) 1914 memmove(text, rs, LINESIZ); 1915 else { 1916 memmove(text, rs, len); 1917 memmove(text + len, ring, LINESIZ - len); 1918 } 1919 if (++rs == endring) 1920 rs = ring; 1921 if (write(s, text, sizeof(text)) != sizeof(text)) 1922 break; 1923 } 1924 } 1925 1926 /* ARGSUSED */ 1927 static void 1928 chargen_dg(int s, struct servtab *sep) /* Character generator */ 1929 { 1930 struct sockaddr_storage ss; 1931 struct sockaddr *sa; 1932 static char *rs; 1933 int len; 1934 socklen_t size; 1935 char text[LINESIZ+2]; 1936 1937 if (endring == 0) { 1938 initring(); 1939 rs = ring; 1940 } 1941 1942 sa = (struct sockaddr *)&ss; 1943 size = sizeof(ss); 1944 if (recvfrom(s, text, sizeof(text), 0, sa, &size) < 0) 1945 return; 1946 1947 if (!port_good_dg(sa)) 1948 return; 1949 1950 if ((len = endring - rs) >= LINESIZ) 1951 memmove(text, rs, LINESIZ); 1952 else { 1953 memmove(text, rs, len); 1954 memmove(text + len, ring, LINESIZ - len); 1955 } 1956 if (++rs == endring) 1957 rs = ring; 1958 text[LINESIZ] = '\r'; 1959 text[LINESIZ + 1] = '\n'; 1960 (void) sendto(s, text, sizeof(text), 0, sa, size); 1961 } 1962 1963 /* 1964 * Return a machine readable date and time, in the form of the 1965 * number of seconds since midnight, Jan 1, 1900. Since gettimeofday 1966 * returns the number of seconds since midnight, Jan 1, 1970, 1967 * we must add 2208988800 seconds to this figure to make up for 1968 * some seventy years Bell Labs was asleep. 1969 */ 1970 1971 static uint32_t 1972 machtime(void) 1973 { 1974 struct timeval tv; 1975 1976 if (gettimeofday(&tv, NULL) < 0) { 1977 if (debug) 1978 fprintf(stderr, "Unable to get time of day\n"); 1979 return (0); 1980 } 1981 #define OFFSET ((uint32_t)25567 * 24*60*60) 1982 return (htonl((uint32_t)(tv.tv_sec + OFFSET))); 1983 #undef OFFSET 1984 } 1985 1986 /* ARGSUSED */ 1987 static void 1988 machtime_stream(int s, struct servtab *sep) 1989 { 1990 uint32_t result; 1991 1992 result = machtime(); 1993 (void) write(s, (char *) &result, sizeof(result)); 1994 } 1995 1996 /* ARGSUSED */ 1997 void 1998 machtime_dg(int s, struct servtab *sep) 1999 { 2000 uint32_t result; 2001 struct sockaddr_storage ss; 2002 struct sockaddr *sa; 2003 socklen_t size; 2004 2005 sa = (struct sockaddr *)&ss; 2006 size = sizeof(ss); 2007 if (recvfrom(s, (char *)&result, sizeof(result), 0, sa, &size) < 0) 2008 return; 2009 if (!port_good_dg(sa)) 2010 return; 2011 result = machtime(); 2012 (void) sendto(s, (char *) &result, sizeof(result), 0, sa, size); 2013 } 2014 2015 /* ARGSUSED */ 2016 static void 2017 daytime_stream(int s,struct servtab *sep) 2018 /* Return human-readable time of day */ 2019 { 2020 char buffer[256]; 2021 time_t clock; 2022 int len; 2023 2024 clock = time((time_t *) 0); 2025 2026 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 2027 (void) write(s, buffer, len); 2028 } 2029 2030 /* ARGSUSED */ 2031 void 2032 daytime_dg(int s, struct servtab *sep) 2033 /* Return human-readable time of day */ 2034 { 2035 char buffer[256]; 2036 time_t clock; 2037 struct sockaddr_storage ss; 2038 struct sockaddr *sa; 2039 socklen_t size; 2040 int len; 2041 2042 clock = time((time_t *) 0); 2043 2044 sa = (struct sockaddr *)&ss; 2045 size = sizeof(ss); 2046 if (recvfrom(s, buffer, sizeof(buffer), 0, sa, &size) < 0) 2047 return; 2048 if (!port_good_dg(sa)) 2049 return; 2050 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 2051 (void) sendto(s, buffer, len, 0, sa, size); 2052 } 2053 2054 /* 2055 * print_service: 2056 * Dump relevant information to stderr 2057 */ 2058 static void 2059 print_service(char *action, struct servtab *sep) 2060 { 2061 2062 if (isrpcservice(sep)) 2063 fprintf(stderr, 2064 "%s: %s rpcprog=%d, rpcvers = %d/%d, proto=%s, wait.max=%d.%d, user:group=%s:%s builtin=%lx server=%s" 2065 #ifdef IPSEC 2066 " policy=\"%s\"" 2067 #endif 2068 "\n", 2069 action, sep->se_service, 2070 sep->se_rpcprog, sep->se_rpcversh, sep->se_rpcversl, sep->se_proto, 2071 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 2072 (long)sep->se_bi, sep->se_server 2073 #ifdef IPSEC 2074 , (sep->se_policy ? sep->se_policy : "") 2075 #endif 2076 ); 2077 else 2078 fprintf(stderr, 2079 "%s: %s proto=%s%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_type == FAITH_TYPE ? "faith/" : "", 2086 sep->se_proto, 2087 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 2088 (long)sep->se_bi, sep->se_server 2089 #ifdef IPSEC 2090 , (sep->se_policy ? sep->se_policy : "") 2091 #endif 2092 ); 2093 } 2094 2095 static void 2096 usage(void) 2097 { 2098 #ifdef LIBWRAP 2099 (void)fprintf(stderr, "usage: %s [-dl] [conf]\n", getprogname()); 2100 #else 2101 (void)fprintf(stderr, "usage: %s [-d] [conf]\n", getprogname()); 2102 #endif 2103 exit(1); 2104 } 2105 2106 2107 /* 2108 * Based on TCPMUX.C by Mark K. Lottor November 1988 2109 * sri-nic::ps:<mkl>tcpmux.c 2110 */ 2111 2112 static int /* # of characters upto \r,\n or \0 */ 2113 getline(int fd, char *buf, int len) 2114 { 2115 int count = 0, n; 2116 2117 do { 2118 n = read(fd, buf, len-count); 2119 if (n == 0) 2120 return (count); 2121 if (n < 0) 2122 return (-1); 2123 while (--n >= 0) { 2124 if (*buf == '\r' || *buf == '\n' || *buf == '\0') 2125 return (count); 2126 count++; 2127 buf++; 2128 } 2129 } while (count < len); 2130 return (count); 2131 } 2132 2133 #define MAX_SERV_LEN (256+2) /* 2 bytes for \r\n */ 2134 2135 #define strwrite(fd, buf) (void) write(fd, buf, sizeof(buf)-1) 2136 2137 static void 2138 tcpmux(int ctrl, struct servtab *sep) 2139 { 2140 char service[MAX_SERV_LEN+1]; 2141 int len; 2142 2143 /* Get requested service name */ 2144 if ((len = getline(ctrl, service, MAX_SERV_LEN)) < 0) { 2145 strwrite(ctrl, "-Error reading service name\r\n"); 2146 goto reject; 2147 } 2148 service[len] = '\0'; 2149 2150 if (debug) 2151 fprintf(stderr, "tcpmux: someone wants %s\n", service); 2152 2153 /* 2154 * Help is a required command, and lists available services, 2155 * one per line. 2156 */ 2157 if (!strcasecmp(service, "help")) { 2158 strwrite(ctrl, "+Available services:\r\n"); 2159 strwrite(ctrl, "help\r\n"); 2160 for (sep = servtab; sep != NULL; sep = sep->se_next) { 2161 if (!ISMUX(sep)) 2162 continue; 2163 (void)write(ctrl, sep->se_service, 2164 strlen(sep->se_service)); 2165 strwrite(ctrl, "\r\n"); 2166 } 2167 goto reject; 2168 } 2169 2170 /* Try matching a service in inetd.conf with the request */ 2171 for (sep = servtab; sep != NULL; sep = sep->se_next) { 2172 if (!ISMUX(sep)) 2173 continue; 2174 if (!strcasecmp(service, sep->se_service)) { 2175 if (ISMUXPLUS(sep)) 2176 strwrite(ctrl, "+Go\r\n"); 2177 run_service(ctrl, sep); 2178 return; 2179 } 2180 } 2181 strwrite(ctrl, "-Service not available\r\n"); 2182 reject: 2183 _exit(1); 2184 } 2185 2186 #ifdef MULOG 2187 void 2188 dolog(struct servtab *sep, int ctrl) 2189 { 2190 struct sockaddr_storage ss; 2191 struct sockaddr *sa = (struct sockaddr *)&ss; 2192 socklen_t len = sizeof(ss); 2193 char *host, *dp, buf[BUFSIZ]; 2194 int connected = 1; 2195 2196 switch (sep->se_family) { 2197 case AF_INET: 2198 #ifdef INET6 2199 case AF_INET6: 2200 #endif 2201 break; 2202 default: 2203 return; 2204 } 2205 2206 if (getpeername(ctrl, sa, &len) < 0) { 2207 if (errno != ENOTCONN) { 2208 syslog(LOG_ERR, "getpeername: %m"); 2209 return; 2210 } 2211 if (recvfrom(ctrl, buf, sizeof(buf), MSG_PEEK, sa, &len) < 0) { 2212 syslog(LOG_ERR, "recvfrom: %m"); 2213 return; 2214 } 2215 connected = 0; 2216 } 2217 switch (sa->sa_family) { 2218 case AF_INET: 2219 #ifdef INET6 2220 case AF_INET6: 2221 #endif 2222 break; 2223 default: 2224 syslog(LOG_ERR, "unexpected address family %u", sa->sa_family); 2225 return; 2226 } 2227 2228 if (getnameinfo(sa, len, buf, sizeof(buf), NULL, 0, 0) != 0) 2229 strlcpy(buf, "?", sizeof(buf)); 2230 host = buf; 2231 2232 switch (sep->se_log & ~MULOG_RFC931) { 2233 case 0: 2234 return; 2235 case 1: 2236 if (curdom == NULL || *curdom == '\0') 2237 break; 2238 dp = host + strlen(host) - strlen(curdom); 2239 if (dp < host) 2240 break; 2241 if (debug) 2242 fprintf(stderr, "check \"%s\" against curdom \"%s\"\n", 2243 host, curdom); 2244 if (strcasecmp(dp, curdom) == 0) 2245 return; 2246 break; 2247 case 2: 2248 default: 2249 break; 2250 } 2251 2252 openlog("", LOG_NOWAIT, MULOG); 2253 2254 if (connected && (sep->se_log & MULOG_RFC931)) 2255 syslog(LOG_INFO, "%s@%s wants %s", 2256 rfc931_name(sa, ctrl), host, sep->se_service); 2257 else 2258 syslog(LOG_INFO, "%s wants %s", 2259 host, sep->se_service); 2260 } 2261 2262 /* 2263 * From tcp_log by 2264 * Wietse Venema, Eindhoven University of Technology, The Netherlands. 2265 */ 2266 #if 0 2267 static char sccsid[] = "@(#) rfc931.c 1.3 92/08/31 22:54:46"; 2268 #endif 2269 2270 #include <setjmp.h> 2271 2272 #define RFC931_PORT 113 /* Semi-well-known port */ 2273 #define TIMEOUT 4 2274 #define TIMEOUT2 10 2275 2276 static jmp_buf timebuf; 2277 2278 /* timeout - handle timeouts */ 2279 2280 static void 2281 timeout(int sig) 2282 { 2283 longjmp(timebuf, sig); 2284 } 2285 2286 /* rfc931_name - return remote user name */ 2287 2288 char * 2289 rfc931_name(struct sockaddr *there, /* remote link information */ 2290 int ctrl) 2291 { 2292 struct sockaddr_storage here; /* local link information */ 2293 struct sockaddr_storage sin; /* for talking to RFC931 daemon */ 2294 socklen_t length; 2295 int s; 2296 unsigned remote; 2297 unsigned local; 2298 static char user[256]; /* XXX */ 2299 char buf[256]; 2300 char *cp; 2301 char *result = "USER_UNKNOWN"; 2302 int len; 2303 u_int16_t myport, hisport; 2304 2305 /* Find out local port number of our stdin. */ 2306 2307 length = sizeof(here); 2308 if (getsockname(ctrl, (struct sockaddr *) &here, &length) == -1) { 2309 syslog(LOG_ERR, "getsockname: %m"); 2310 return (result); 2311 } 2312 switch (here.ss_family) { 2313 case AF_INET: 2314 myport = ((struct sockaddr_in *)&here)->sin_port; 2315 break; 2316 #ifdef INET6 2317 case AF_INET6: 2318 myport = ((struct sockaddr_in6 *)&here)->sin6_port; 2319 break; 2320 #endif 2321 } 2322 switch (there->sa_family) { 2323 case AF_INET: 2324 hisport = ((struct sockaddr_in *)&there)->sin_port; 2325 break; 2326 #ifdef INET6 2327 case AF_INET6: 2328 hisport = ((struct sockaddr_in6 *)&there)->sin6_port; 2329 break; 2330 #endif 2331 } 2332 /* Set up timer so we won't get stuck. */ 2333 2334 if ((s = socket(here.ss_family, SOCK_STREAM, 0)) == -1) { 2335 syslog(LOG_ERR, "socket: %m"); 2336 return (result); 2337 } 2338 2339 sin = here; 2340 switch (sin.ss_family) { 2341 case AF_INET: 2342 ((struct sockaddr_in *)&sin)->sin_port = htons(0); 2343 break; 2344 #ifdef INET6 2345 case AF_INET6: 2346 ((struct sockaddr_in6 *)&sin)->sin6_port = htons(0); 2347 break; 2348 #endif 2349 } 2350 if (bind(s, (struct sockaddr *) &sin, sin.ss_len) == -1) { 2351 syslog(LOG_ERR, "bind: %m"); 2352 return (result); 2353 } 2354 2355 signal(SIGALRM, timeout); 2356 if (setjmp(timebuf)) { 2357 close(s); /* not: fclose(fp) */ 2358 return (result); 2359 } 2360 alarm(TIMEOUT); 2361 2362 /* Connect to the RFC931 daemon. */ 2363 2364 memcpy(&sin, there, there->sa_len); 2365 switch (sin.ss_family) { 2366 case AF_INET: 2367 ((struct sockaddr_in *)&sin)->sin_port = htons(RFC931_PORT); 2368 break; 2369 #ifdef INET6 2370 case AF_INET6: 2371 ((struct sockaddr_in6 *)&sin)->sin6_port = htons(RFC931_PORT); 2372 break; 2373 #endif 2374 } 2375 if (connect(s, (struct sockaddr *) &sin, sin.ss_len) == -1) { 2376 close(s); 2377 alarm(0); 2378 return (result); 2379 } 2380 2381 /* Query the RFC 931 server. Would 13-byte writes ever be broken up? */ 2382 (void)snprintf(buf, sizeof buf, "%u,%u\r\n", ntohs(hisport), 2383 ntohs(myport)); 2384 2385 for (len = 0, cp = buf; len < strlen(buf); ) { 2386 int n; 2387 2388 if ((n = write(s, cp, strlen(buf) - len)) == -1) { 2389 close(s); 2390 alarm(0); 2391 return (result); 2392 } 2393 cp += n; 2394 len += n; 2395 } 2396 2397 /* Read response */ 2398 for (cp = buf; cp < buf + sizeof(buf) - 1; ) { 2399 char c; 2400 if (read(s, &c, 1) != 1) { 2401 close(s); 2402 alarm(0); 2403 return (result); 2404 } 2405 if (c == '\n') 2406 break; 2407 *cp++ = c; 2408 } 2409 *cp = '\0'; 2410 2411 if (sscanf(buf, "%u , %u : USERID :%*[^:]:%255s", &remote, &local, 2412 user) == 3 && ntohs(hisport) == remote && ntohs(myport) == local) { 2413 /* Strip trailing carriage return. */ 2414 if ((cp = strchr(user, '\r')) != NULL) 2415 *cp = 0; 2416 result = user; 2417 } 2418 2419 alarm(0); 2420 close(s); 2421 return (result); 2422 } 2423 #endif 2424 2425 /* 2426 * check if the address/port where send data to is one of the obvious ports 2427 * that are used for denial of service attacks like two echo ports 2428 * just echoing data between them 2429 */ 2430 static int 2431 port_good_dg(struct sockaddr *sa) 2432 { 2433 struct in_addr in; 2434 #ifdef INET6 2435 struct in6_addr *in6; 2436 #endif 2437 u_int16_t port; 2438 int i, bad; 2439 char hbuf[NI_MAXHOST]; 2440 2441 bad = 0; 2442 2443 switch (sa->sa_family) { 2444 case AF_INET: 2445 in.s_addr = ntohl(((struct sockaddr_in *)sa)->sin_addr.s_addr); 2446 port = ntohs(((struct sockaddr_in *)sa)->sin_port); 2447 v4chk: 2448 if (IN_MULTICAST(in.s_addr)) 2449 goto bad; 2450 switch ((in.s_addr & 0xff000000) >> 24) { 2451 case 0: case 127: case 255: 2452 goto bad; 2453 } 2454 if (dg_broadcast(&in)) 2455 goto bad; 2456 break; 2457 #ifdef INET6 2458 case AF_INET6: 2459 in6 = &((struct sockaddr_in6 *)sa)->sin6_addr; 2460 port = ntohs(((struct sockaddr_in6 *)sa)->sin6_port); 2461 if (IN6_IS_ADDR_MULTICAST(in6) || IN6_IS_ADDR_UNSPECIFIED(in6)) 2462 goto bad; 2463 if (IN6_IS_ADDR_V4MAPPED(in6) || IN6_IS_ADDR_V4COMPAT(in6)) { 2464 memcpy(&in, &in6->s6_addr[12], sizeof(in)); 2465 in.s_addr = ntohl(in.s_addr); 2466 goto v4chk; 2467 } 2468 break; 2469 #endif 2470 default: 2471 /* XXX unsupported af, is it safe to assume it to be safe? */ 2472 return (1); 2473 } 2474 2475 for (i = 0; bad_ports[i] != 0; i++) { 2476 if (port == bad_ports[i]) 2477 goto bad; 2478 } 2479 2480 return (1); 2481 2482 bad: 2483 if (getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), NULL, 0, 2484 niflags) != 0) 2485 strlcpy(hbuf, "?", sizeof(hbuf)); 2486 syslog(LOG_WARNING,"Possible DoS attack from %s, Port %d", 2487 hbuf, port); 2488 return (0); 2489 } 2490 2491 /* XXX need optimization */ 2492 static int 2493 dg_broadcast(struct in_addr *in) 2494 { 2495 struct ifaddrs *ifa, *ifap; 2496 struct sockaddr_in *sin; 2497 2498 if (getifaddrs(&ifap) < 0) 2499 return (0); 2500 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 2501 if (ifa->ifa_addr->sa_family != AF_INET || 2502 (ifa->ifa_flags & IFF_BROADCAST) == 0) 2503 continue; 2504 sin = (struct sockaddr_in *)ifa->ifa_broadaddr; 2505 if (sin->sin_addr.s_addr == in->s_addr) { 2506 freeifaddrs(ifap); 2507 return (1); 2508 } 2509 } 2510 freeifaddrs(ifap); 2511 return (0); 2512 } 2513 2514 static int 2515 my_kevent(const struct kevent *changelist, size_t nchanges, 2516 struct kevent *eventlist, size_t nevents) 2517 { 2518 int result; 2519 2520 while ((result = kevent(kq, changelist, nchanges, eventlist, nevents, 2521 NULL)) < 0) 2522 if (errno != EINTR) { 2523 syslog(LOG_ERR, "kevent: %m"); 2524 exit(EXIT_FAILURE); 2525 } 2526 2527 return (result); 2528 } 2529 2530 static struct kevent * 2531 allocchange(void) 2532 { 2533 if (changes == A_CNT(changebuf)) { 2534 (void) my_kevent(changebuf, A_CNT(changebuf), NULL, 0); 2535 changes = 0; 2536 } 2537 2538 return (&changebuf[changes++]); 2539 } 2540
Indexes created Fri Oct 17 09:09:57 GMT 2025