inetd.c revision 1.101
1 /* $NetBSD: inetd.c,v 1.101 2006/05/11 06:59:40 mrg 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 1.101 2006/05/11 06:59:40 mrg 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 if (signum != SIGCHLD) 504 (void) signal(signum, SIG_IGN); 505 506 if (signum != SIGPIPE) { 507 struct kevent *ev; 508 509 ev = allocchange(); 510 EV_SET(ev, signum, EVFILT_SIGNAL, EV_ADD | EV_ENABLE, 511 0, 0, 0); 512 } 513 } 514 515 for (;;) { 516 int ctrl; 517 struct kevent eventbuf[64], *ev; 518 struct servtab *sep; 519 520 if (reload) { 521 reload = 0; 522 config(); 523 } 524 525 n = my_kevent(changebuf, changes, eventbuf, A_CNT(eventbuf)); 526 changes = 0; 527 528 for (ev = eventbuf; n > 0; ev++, n--) { 529 if (ev->filter == EVFILT_SIGNAL) { 530 switch (ev->ident) { 531 case SIGALRM: 532 retry(); 533 break; 534 case SIGCHLD: 535 reapchild(); 536 break; 537 case SIGTERM: 538 case SIGINT: 539 goaway(); 540 break; 541 case SIGHUP: 542 reload = 1; 543 break; 544 } 545 continue; 546 } 547 if (ev->filter != EVFILT_READ) 548 continue; 549 sep = (struct servtab *)ev->udata; 550 /* Paranoia */ 551 if (ev->ident != sep->se_fd) 552 continue; 553 if (debug) 554 fprintf(stderr, "someone wants %s\n", 555 sep->se_service); 556 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 557 /* XXX here do the libwrap check-before-accept*/ 558 ctrl = accept(sep->se_fd, NULL, NULL); 559 if (debug) 560 fprintf(stderr, "accept, ctrl %d\n", 561 ctrl); 562 if (ctrl < 0) { 563 if (errno != EINTR) 564 syslog(LOG_WARNING, 565 "accept (for %s): %m", 566 sep->se_service); 567 continue; 568 } 569 } else 570 ctrl = sep->se_fd; 571 spawn(sep, ctrl); 572 } 573 } 574 } 575 576 static void 577 spawn(struct servtab *sep, int ctrl) 578 { 579 int dofork; 580 pid_t pid; 581 582 pid = 0; 583 #ifdef LIBWRAP_INTERNAL 584 dofork = 1; 585 #else 586 dofork = (sep->se_bi == 0 || sep->se_bi->bi_fork); 587 #endif 588 if (dofork) { 589 if (sep->se_count++ == 0) 590 (void)gettimeofday(&sep->se_time, NULL); 591 else if (sep->se_count >= sep->se_max) { 592 struct timeval now; 593 594 (void)gettimeofday(&now, NULL); 595 if (now.tv_sec - sep->se_time.tv_sec > CNT_INTVL) { 596 sep->se_time = now; 597 sep->se_count = 1; 598 } else { 599 syslog(LOG_ERR, 600 "%s/%s max spawn rate (%d in %d seconds) " 601 "exceeded; service not started", 602 sep->se_service, sep->se_proto, 603 sep->se_max, CNT_INTVL); 604 if (!sep->se_wait && sep->se_socktype == 605 SOCK_STREAM) 606 close(ctrl); 607 close_sep(sep); 608 if (!timingout) { 609 timingout = 1; 610 alarm(RETRYTIME); 611 } 612 return; 613 } 614 } 615 pid = fork(); 616 if (pid < 0) { 617 syslog(LOG_ERR, "fork: %m"); 618 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 619 close(ctrl); 620 sleep(1); 621 return; 622 } 623 if (pid != 0 && sep->se_wait) { 624 struct kevent *ev; 625 626 sep->se_wait = pid; 627 ev = allocchange(); 628 EV_SET(ev, sep->se_fd, EVFILT_READ, 629 EV_DELETE, 0, 0, 0); 630 } 631 if (pid == 0) { 632 int n; 633 634 for (n = 0; n < A_CNT(my_signals); n++) 635 (void) signal(my_signals[n], SIG_DFL); 636 if (debug) 637 setsid(); 638 } 639 } 640 if (pid == 0) { 641 run_service(ctrl, sep); 642 if (dofork) 643 exit(0); 644 } 645 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 646 close(ctrl); 647 } 648 649 static void 650 run_service(int ctrl, struct servtab *sep) 651 { 652 struct passwd *pwd; 653 struct group *grp = NULL; /* XXX gcc */ 654 char buf[NI_MAXSERV]; 655 #ifdef LIBWRAP 656 struct request_info req; 657 int denied; 658 char *service = NULL; /* XXX gcc */ 659 #endif 660 661 #ifdef LIBWRAP 662 #ifndef LIBWRAP_INTERNAL 663 if (sep->se_bi == 0) 664 #endif 665 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 666 request_init(&req, RQ_DAEMON, sep->se_argv[0] ? 667 sep->se_argv[0] : sep->se_service, RQ_FILE, ctrl, NULL); 668 fromhost(&req); 669 denied = !hosts_access(&req); 670 if (denied || lflag) { 671 if (getnameinfo(&sep->se_ctrladdr, 672 sep->se_ctrladdr.sa_len, NULL, 0, 673 buf, sizeof(buf), 0) != 0) { 674 /* shouldn't happen */ 675 (void)snprintf(buf, sizeof buf, "%d", 676 ntohs(sep->se_ctrladdr_in.sin_port)); 677 } 678 service = buf; 679 } 680 if (denied) { 681 syslog(deny_severity, 682 "refused connection from %.500s, service %s (%s)", 683 eval_client(&req), service, sep->se_proto); 684 goto reject; 685 } 686 if (lflag) { 687 syslog(allow_severity, 688 "connection from %.500s, service %s (%s)", 689 eval_client(&req), service, sep->se_proto); 690 } 691 } 692 #endif /* LIBWRAP */ 693 694 if (sep->se_bi) { 695 (*sep->se_bi->bi_fn)(ctrl, sep); 696 } else { 697 if ((pwd = getpwnam(sep->se_user)) == NULL) { 698 syslog(LOG_ERR, "%s/%s: %s: No such user", 699 sep->se_service, sep->se_proto, sep->se_user); 700 goto reject; 701 } 702 if (sep->se_group && 703 (grp = getgrnam(sep->se_group)) == NULL) { 704 syslog(LOG_ERR, "%s/%s: %s: No such group", 705 sep->se_service, sep->se_proto, sep->se_group); 706 goto reject; 707 } 708 if (pwd->pw_uid) { 709 if (sep->se_group) 710 pwd->pw_gid = grp->gr_gid; 711 if (setgid(pwd->pw_gid) < 0) { 712 syslog(LOG_ERR, 713 "%s/%s: can't set gid %d: %m", sep->se_service, 714 sep->se_proto, pwd->pw_gid); 715 goto reject; 716 } 717 (void) initgroups(pwd->pw_name, 718 pwd->pw_gid); 719 if (setuid(pwd->pw_uid) < 0) { 720 syslog(LOG_ERR, 721 "%s/%s: can't set uid %d: %m", sep->se_service, 722 sep->se_proto, pwd->pw_uid); 723 goto reject; 724 } 725 } else if (sep->se_group) { 726 (void) setgid((gid_t)grp->gr_gid); 727 } 728 if (debug) 729 fprintf(stderr, "%d execl %s\n", 730 getpid(), sep->se_server); 731 #ifdef MULOG 732 if (sep->se_log) 733 dolog(sep, ctrl); 734 #endif 735 /* Set our control descriptor to not close-on-exec... */ 736 if (fcntl(ctrl, F_SETFD, 0) < 0) 737 syslog(LOG_ERR, "fcntl (F_SETFD, 0): %m"); 738 /* ...and dup it to stdin, stdout, and stderr. */ 739 if (ctrl != 0) { 740 dup2(ctrl, 0); 741 close(ctrl); 742 ctrl = 0; 743 } 744 dup2(0, 1); 745 dup2(0, 2); 746 #ifdef RLIMIT_NOFILE 747 if (rlim_ofile.rlim_cur != rlim_ofile_cur && 748 setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) 749 syslog(LOG_ERR, "setrlimit: %m"); 750 #endif 751 execv(sep->se_server, sep->se_argv); 752 syslog(LOG_ERR, "cannot execute %s: %m", sep->se_server); 753 reject: 754 if (sep->se_socktype != SOCK_STREAM) 755 recv(ctrl, buf, sizeof (buf), 0); 756 _exit(1); 757 } 758 } 759 760 static void 761 reapchild(void) 762 { 763 int status; 764 pid_t pid; 765 struct servtab *sep; 766 767 for (;;) { 768 pid = wait3(&status, WNOHANG, NULL); 769 if (pid <= 0) 770 break; 771 if (debug) 772 (void) fprintf(stderr, "%d reaped, status %#x\n", 773 pid, status); 774 for (sep = servtab; sep != NULL; sep = sep->se_next) 775 if (sep->se_wait == pid) { 776 struct kevent *ev; 777 778 if (WIFEXITED(status) && WEXITSTATUS(status)) 779 syslog(LOG_WARNING, 780 "%s: exit status 0x%x", 781 sep->se_server, WEXITSTATUS(status)); 782 else if (WIFSIGNALED(status)) 783 syslog(LOG_WARNING, 784 "%s: exit signal 0x%x", 785 sep->se_server, WTERMSIG(status)); 786 sep->se_wait = 1; 787 ev = allocchange(); 788 EV_SET(ev, sep->se_fd, EVFILT_READ, 789 EV_ADD | EV_ENABLE, 0, 0, (intptr_t)sep); 790 if (debug) 791 fprintf(stderr, "restored %s, fd %d\n", 792 sep->se_service, sep->se_fd); 793 } 794 } 795 } 796 797 static void 798 config(void) 799 { 800 struct servtab *sep, *cp, **sepp; 801 int n; 802 803 if (!setconfig()) { 804 syslog(LOG_ERR, "%s: %m", CONFIG); 805 return; 806 } 807 for (sep = servtab; sep != NULL; sep = sep->se_next) 808 sep->se_checked = 0; 809 while ((cp = getconfigent())) { 810 for (sep = servtab; sep != NULL; sep = sep->se_next) 811 if (strcmp(sep->se_service, cp->se_service) == 0 && 812 strcmp(sep->se_hostaddr, cp->se_hostaddr) == 0 && 813 strcmp(sep->se_proto, cp->se_proto) == 0 && 814 ISMUX(sep) == ISMUX(cp)) 815 break; 816 if (sep != NULL) { 817 int i; 818 819 #define SWAP(type, a, b) {type c = a; a = b; b = c;} 820 821 /* 822 * sep->se_wait may be holding the pid of a daemon 823 * that we're waiting for. If so, don't overwrite 824 * it unless the config file explicitly says don't 825 * wait. 826 */ 827 if (cp->se_bi == 0 && 828 (sep->se_wait == 1 || cp->se_wait == 0)) 829 sep->se_wait = cp->se_wait; 830 SWAP(char *, sep->se_user, cp->se_user); 831 SWAP(char *, sep->se_group, cp->se_group); 832 SWAP(char *, sep->se_server, cp->se_server); 833 for (i = 0; i < MAXARGV; i++) 834 SWAP(char *, sep->se_argv[i], cp->se_argv[i]); 835 #ifdef IPSEC 836 SWAP(char *, sep->se_policy, cp->se_policy); 837 #endif 838 SWAP(int, cp->se_type, sep->se_type); 839 SWAP(int, cp->se_max, sep->se_max); 840 #undef SWAP 841 if (isrpcservice(sep)) 842 unregister_rpc(sep); 843 sep->se_rpcversl = cp->se_rpcversl; 844 sep->se_rpcversh = cp->se_rpcversh; 845 freeconfig(cp); 846 if (debug) 847 print_service("REDO", sep); 848 } else { 849 sep = enter(cp); 850 if (debug) 851 print_service("ADD ", sep); 852 } 853 sep->se_checked = 1; 854 855 switch (sep->se_family) { 856 case AF_LOCAL: 857 if (sep->se_fd != -1) 858 break; 859 n = strlen(sep->se_service); 860 if (n > sizeof(sep->se_ctrladdr_un.sun_path)) { 861 syslog(LOG_ERR, "%s: address too long", 862 sep->se_service); 863 sep->se_checked = 0; 864 continue; 865 } 866 (void)unlink(sep->se_service); 867 strncpy(sep->se_ctrladdr_un.sun_path, 868 sep->se_service, n); 869 sep->se_ctrladdr_un.sun_family = AF_LOCAL; 870 sep->se_ctrladdr_size = n + 871 sizeof(sep->se_ctrladdr_un) - 872 sizeof(sep->se_ctrladdr_un.sun_path); 873 if (!ISMUX(sep)) 874 setup(sep); 875 break; 876 case AF_INET: 877 #ifdef INET6 878 case AF_INET6: 879 #endif 880 { 881 struct addrinfo hints, *res; 882 char *host, *port; 883 int error; 884 int s; 885 886 /* check if the family is supported */ 887 s = socket(sep->se_family, SOCK_DGRAM, 0); 888 if (s < 0) { 889 syslog(LOG_WARNING, 890 "%s/%s: %s: the address family is not " 891 "supported by the kernel", 892 sep->se_service, sep->se_proto, 893 sep->se_hostaddr); 894 sep->se_checked = 0; 895 continue; 896 } 897 close(s); 898 899 memset(&hints, 0, sizeof(hints)); 900 hints.ai_family = sep->se_family; 901 hints.ai_socktype = sep->se_socktype; 902 hints.ai_flags = AI_PASSIVE; 903 if (!strcmp(sep->se_hostaddr, "*")) 904 host = NULL; 905 else 906 host = sep->se_hostaddr; 907 if (isrpcservice(sep) || ISMUX(sep)) 908 port = "0"; 909 else 910 port = sep->se_service; 911 error = getaddrinfo(host, port, &hints, &res); 912 if (error) { 913 if (error == EAI_SERVICE) { 914 /* gai_strerror not friendly enough */ 915 syslog(LOG_WARNING, "%s/%s: " 916 "unknown service", 917 sep->se_service, sep->se_proto); 918 } else { 919 syslog(LOG_ERR, "%s/%s: %s: %s", 920 sep->se_service, sep->se_proto, 921 sep->se_hostaddr, 922 gai_strerror(error)); 923 } 924 sep->se_checked = 0; 925 continue; 926 } 927 if (res->ai_next) { 928 syslog(LOG_ERR, 929 "%s/%s: %s: resolved to multiple addr", 930 sep->se_service, sep->se_proto, 931 sep->se_hostaddr); 932 sep->se_checked = 0; 933 freeaddrinfo(res); 934 continue; 935 } 936 memcpy(&sep->se_ctrladdr, res->ai_addr, 937 res->ai_addrlen); 938 if (ISMUX(sep)) { 939 sep->se_fd = -1; 940 freeaddrinfo(res); 941 continue; 942 } 943 sep->se_ctrladdr_size = res->ai_addrlen; 944 freeaddrinfo(res); 945 #ifdef RPC 946 if (isrpcservice(sep)) { 947 struct rpcent *rp; 948 949 sep->se_rpcprog = atoi(sep->se_service); 950 if (sep->se_rpcprog == 0) { 951 rp = getrpcbyname(sep->se_service); 952 if (rp == 0) { 953 syslog(LOG_ERR, 954 "%s/%s: unknown service", 955 sep->se_service, 956 sep->se_proto); 957 sep->se_checked = 0; 958 continue; 959 } 960 sep->se_rpcprog = rp->r_number; 961 } 962 if (sep->se_fd == -1 && !ISMUX(sep)) 963 setup(sep); 964 if (sep->se_fd != -1) 965 register_rpc(sep); 966 } else 967 #endif 968 { 969 if (sep->se_fd >= 0) 970 close_sep(sep); 971 if (sep->se_fd == -1 && !ISMUX(sep)) 972 setup(sep); 973 } 974 } 975 } 976 } 977 endconfig(); 978 /* 979 * Purge anything not looked at above. 980 */ 981 sepp = &servtab; 982 while ((sep = *sepp)) { 983 if (sep->se_checked) { 984 sepp = &sep->se_next; 985 continue; 986 } 987 *sepp = sep->se_next; 988 if (sep->se_fd >= 0) 989 close_sep(sep); 990 if (isrpcservice(sep)) 991 unregister_rpc(sep); 992 if (sep->se_family == AF_LOCAL) 993 (void)unlink(sep->se_service); 994 if (debug) 995 print_service("FREE", sep); 996 freeconfig(sep); 997 free(sep); 998 } 999 } 1000 1001 static void 1002 retry(void) 1003 { 1004 struct servtab *sep; 1005 1006 timingout = 0; 1007 for (sep = servtab; sep != NULL; sep = sep->se_next) { 1008 if (sep->se_fd == -1 && !ISMUX(sep)) { 1009 switch (sep->se_family) { 1010 case AF_LOCAL: 1011 case AF_INET: 1012 #ifdef INET6 1013 case AF_INET6: 1014 #endif 1015 setup(sep); 1016 if (sep->se_fd != -1 && isrpcservice(sep)) 1017 register_rpc(sep); 1018 break; 1019 } 1020 } 1021 } 1022 } 1023 1024 static void 1025 goaway(void) 1026 { 1027 struct servtab *sep; 1028 1029 for (sep = servtab; sep != NULL; sep = sep->se_next) { 1030 if (sep->se_fd == -1) 1031 continue; 1032 1033 switch (sep->se_family) { 1034 case AF_LOCAL: 1035 (void)unlink(sep->se_service); 1036 break; 1037 case AF_INET: 1038 #ifdef INET6 1039 case AF_INET6: 1040 #endif 1041 if (sep->se_wait == 1 && isrpcservice(sep)) 1042 unregister_rpc(sep); 1043 break; 1044 } 1045 (void)close(sep->se_fd); 1046 } 1047 exit(0); 1048 } 1049 1050 static void 1051 setup(struct servtab *sep) 1052 { 1053 int on = 1; 1054 #ifdef INET6 1055 int off = 0; 1056 #endif 1057 struct kevent *ev; 1058 1059 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) { 1060 if (debug) 1061 fprintf(stderr, "socket failed on %s/%s: %s\n", 1062 sep->se_service, sep->se_proto, strerror(errno)); 1063 syslog(LOG_ERR, "%s/%s: socket: %m", 1064 sep->se_service, sep->se_proto); 1065 return; 1066 } 1067 /* Set all listening sockets to close-on-exec. */ 1068 if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) { 1069 syslog(LOG_ERR, "%s/%s: fcntl(F_SETFD, FD_CLOEXEC): %m", 1070 sep->se_service, sep->se_proto); 1071 close(sep->se_fd); 1072 return; 1073 } 1074 1075 #define turnon(fd, opt) \ 1076 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 1077 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 1078 turnon(sep->se_fd, SO_DEBUG) < 0) 1079 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 1080 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 1081 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 1082 #undef turnon 1083 1084 /* Set the socket buffer sizes, if specified. */ 1085 if (sep->se_sndbuf != 0 && setsockopt(sep->se_fd, SOL_SOCKET, 1086 SO_SNDBUF, (char *)&sep->se_sndbuf, sizeof(sep->se_sndbuf)) < 0) 1087 syslog(LOG_ERR, "setsockopt (SO_SNDBUF %d): %m", 1088 sep->se_sndbuf); 1089 if (sep->se_rcvbuf != 0 && setsockopt(sep->se_fd, SOL_SOCKET, 1090 SO_RCVBUF, (char *)&sep->se_rcvbuf, sizeof(sep->se_rcvbuf)) < 0) 1091 syslog(LOG_ERR, "setsockopt (SO_RCVBUF %d): %m", 1092 sep->se_rcvbuf); 1093 #ifdef INET6 1094 if (sep->se_family == AF_INET6) { 1095 int *v; 1096 v = (sep->se_type == FAITH_TYPE) ? &on : &off; 1097 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_FAITH, 1098 (char *)v, sizeof(*v)) < 0) 1099 syslog(LOG_ERR, "setsockopt (IPV6_FAITH): %m"); 1100 } 1101 #endif 1102 #ifdef IPSEC 1103 if (ipsecsetup(sep->se_family, sep->se_fd, sep->se_policy) < 0 && 1104 sep->se_policy) { 1105 syslog(LOG_ERR, "%s/%s: ipsec setup failed", 1106 sep->se_service, sep->se_proto); 1107 (void)close(sep->se_fd); 1108 sep->se_fd = -1; 1109 return; 1110 } 1111 #endif 1112 1113 if (bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size) < 0) { 1114 if (debug) 1115 fprintf(stderr, "bind failed on %s/%s: %s\n", 1116 sep->se_service, sep->se_proto, strerror(errno)); 1117 syslog(LOG_ERR, "%s/%s: bind: %m", 1118 sep->se_service, sep->se_proto); 1119 (void) close(sep->se_fd); 1120 sep->se_fd = -1; 1121 if (!timingout) { 1122 timingout = 1; 1123 alarm(RETRYTIME); 1124 } 1125 return; 1126 } 1127 if (sep->se_socktype == SOCK_STREAM) 1128 listen(sep->se_fd, 10); 1129 1130 ev = allocchange(); 1131 EV_SET(ev, sep->se_fd, EVFILT_READ, EV_ADD | EV_ENABLE, 0, 0, 1132 (intptr_t)sep); 1133 if (sep->se_fd > maxsock) { 1134 maxsock = sep->se_fd; 1135 if (maxsock > rlim_ofile_cur - FD_MARGIN) 1136 bump_nofile(); 1137 } 1138 if (debug) 1139 fprintf(stderr, "registered %s on %d\n", 1140 sep->se_server, sep->se_fd); 1141 } 1142 1143 /* 1144 * Finish with a service and its socket. 1145 */ 1146 static void 1147 close_sep(struct servtab *sep) 1148 { 1149 if (sep->se_fd >= 0) { 1150 (void) close(sep->se_fd); 1151 sep->se_fd = -1; 1152 } 1153 sep->se_count = 0; 1154 } 1155 1156 static void 1157 register_rpc(struct servtab *sep) 1158 { 1159 #ifdef RPC 1160 socklen_t n; 1161 struct netbuf nbuf; 1162 struct sockaddr_storage ss; 1163 struct netconfig *nconf; 1164 1165 if ((nconf = getnetconfigent(sep->se_proto+4)) == NULL) { 1166 syslog(LOG_ERR, "%s: getnetconfigent failed", 1167 sep->se_proto); 1168 return; 1169 } 1170 n = sizeof ss; 1171 if (getsockname(sep->se_fd, (struct sockaddr *)&ss, &n) < 0) { 1172 syslog(LOG_ERR, "%s/%s: getsockname: %m", 1173 sep->se_service, sep->se_proto); 1174 return; 1175 } 1176 1177 nbuf.buf = &ss; 1178 nbuf.len = ss.ss_len; 1179 nbuf.maxlen = sizeof (struct sockaddr_storage); 1180 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1181 if (debug) 1182 fprintf(stderr, "rpcb_set: %u %d %s %s\n", 1183 sep->se_rpcprog, n, nconf->nc_netid, 1184 taddr2uaddr(nconf, &nbuf)); 1185 (void)rpcb_unset(sep->se_rpcprog, n, nconf); 1186 if (!rpcb_set(sep->se_rpcprog, n, nconf, &nbuf)) 1187 syslog(LOG_ERR, "rpcb_set: %u %d %s %s%s", 1188 sep->se_rpcprog, n, nconf->nc_netid, 1189 taddr2uaddr(nconf, &nbuf), clnt_spcreateerror("")); 1190 } 1191 #endif /* RPC */ 1192 } 1193 1194 static void 1195 unregister_rpc(struct servtab *sep) 1196 { 1197 #ifdef RPC 1198 int n; 1199 struct netconfig *nconf; 1200 1201 if ((nconf = getnetconfigent(sep->se_proto+4)) == NULL) { 1202 syslog(LOG_ERR, "%s: getnetconfigent failed", 1203 sep->se_proto); 1204 return; 1205 } 1206 1207 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1208 if (debug) 1209 fprintf(stderr, "rpcb_unset(%u, %d, %s)\n", 1210 sep->se_rpcprog, n, nconf->nc_netid); 1211 if (!rpcb_unset(sep->se_rpcprog, n, nconf)) 1212 syslog(LOG_ERR, "rpcb_unset(%u, %d, %s) failed\n", 1213 sep->se_rpcprog, n, nconf->nc_netid); 1214 } 1215 #endif /* RPC */ 1216 } 1217 1218 1219 static struct servtab * 1220 enter(struct servtab *cp) 1221 { 1222 struct servtab *sep; 1223 1224 sep = (struct servtab *)malloc(sizeof (*sep)); 1225 if (sep == NULL) { 1226 syslog(LOG_ERR, "Out of memory."); 1227 exit(1); 1228 } 1229 *sep = *cp; 1230 sep->se_fd = -1; 1231 sep->se_rpcprog = -1; 1232 sep->se_next = servtab; 1233 servtab = sep; 1234 return (sep); 1235 } 1236 1237 FILE *fconfig = NULL; 1238 struct servtab serv; 1239 char line[LINE_MAX]; 1240 char *defhost; 1241 #ifdef IPSEC 1242 static char *policy = NULL; 1243 #endif 1244 1245 static int 1246 setconfig(void) 1247 { 1248 if (defhost) 1249 free(defhost); 1250 defhost = newstr("*"); 1251 #ifdef IPSEC 1252 if (policy) 1253 free(policy); 1254 policy = NULL; 1255 #endif 1256 if (fconfig != NULL) { 1257 fseek(fconfig, 0L, SEEK_SET); 1258 return (1); 1259 } 1260 fconfig = fopen(CONFIG, "r"); 1261 return (fconfig != NULL); 1262 } 1263 1264 static void 1265 endconfig(void) 1266 { 1267 if (fconfig != NULL) { 1268 (void) fclose(fconfig); 1269 fconfig = NULL; 1270 } 1271 if (defhost != NULL) { 1272 free(defhost); 1273 defhost = NULL; 1274 } 1275 } 1276 1277 static struct servtab * 1278 getconfigent(void) 1279 { 1280 struct servtab *sep = &serv; 1281 int argc, val; 1282 char *cp, *cp0, *arg, *buf0, *buf1, *sz0, *sz1; 1283 static char TCPMUX_TOKEN[] = "tcpmux/"; 1284 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) 1285 char *hostdelim; 1286 1287 more: 1288 while ((cp = nextline(fconfig))) { 1289 #ifdef IPSEC 1290 /* lines starting with #@ is not a comment, but the policy */ 1291 if (cp[0] == '#' && cp[1] == '@') { 1292 char *p; 1293 for (p = cp + 2; p && *p && isspace((unsigned char)*p); p++) 1294 ; 1295 if (*p == '\0') { 1296 if (policy) 1297 free(policy); 1298 policy = NULL; 1299 } else { 1300 if (ipsecsetup_test(p) < 0) { 1301 syslog(LOG_ERR, 1302 "%s: invalid ipsec policy \"%s\"", 1303 CONFIG, p); 1304 exit(1); 1305 } else { 1306 if (policy) 1307 free(policy); 1308 policy = newstr(p); 1309 } 1310 } 1311 } 1312 #endif 1313 if (*cp == '#' || *cp == '\0') 1314 continue; 1315 #ifdef MULOG 1316 /* Avoid use of `skip' if there is a danger of it looking 1317 * at continuation lines. 1318 */ 1319 do { 1320 cp++; 1321 } while (*cp == ' ' || *cp == '\t'); 1322 if (*cp == '\0') 1323 continue; 1324 if ((arg = skip(&cp)) == NULL) 1325 continue; 1326 if (strcmp(arg, "DOMAIN")) 1327 continue; 1328 if (curdom) 1329 free(curdom); 1330 curdom = NULL; 1331 while (*cp == ' ' || *cp == '\t') 1332 cp++; 1333 if (*cp == '\0') 1334 continue; 1335 arg = cp; 1336 while (*cp && *cp != ' ' && *cp != '\t') 1337 cp++; 1338 if (*cp != '\0') 1339 *cp++ = '\0'; 1340 curdom = newstr(arg); 1341 #endif 1342 break; 1343 } 1344 if (cp == NULL) 1345 return (NULL); 1346 /* 1347 * clear the static buffer, since some fields (se_ctrladdr, 1348 * for example) don't get initialized here. 1349 */ 1350 memset((caddr_t)sep, 0, sizeof *sep); 1351 arg = skip(&cp); 1352 if (cp == NULL) { 1353 /* got an empty line containing just blanks/tabs. */ 1354 goto more; 1355 } 1356 /* Check for a host name. */ 1357 hostdelim = strrchr(arg, ':'); 1358 if (hostdelim) { 1359 *hostdelim = '\0'; 1360 if (arg[0] == '[' && hostdelim > arg && hostdelim[-1] == ']') { 1361 hostdelim[-1] = '\0'; 1362 sep->se_hostaddr = newstr(arg + 1); 1363 } else 1364 sep->se_hostaddr = newstr(arg); 1365 arg = hostdelim + 1; 1366 /* 1367 * If the line is of the form `host:', then just change the 1368 * default host for the following lines. 1369 */ 1370 if (*arg == '\0') { 1371 arg = skip(&cp); 1372 if (cp == NULL) { 1373 free(defhost); 1374 defhost = sep->se_hostaddr; 1375 goto more; 1376 } 1377 } 1378 } else 1379 sep->se_hostaddr = newstr(defhost); 1380 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1381 char *c = arg + MUX_LEN; 1382 if (*c == '+') { 1383 sep->se_type = MUXPLUS_TYPE; 1384 c++; 1385 } else 1386 sep->se_type = MUX_TYPE; 1387 sep->se_service = newstr(c); 1388 } else { 1389 sep->se_service = newstr(arg); 1390 sep->se_type = NORM_TYPE; 1391 } 1392 1393 arg = sskip(&cp); 1394 if (strcmp(arg, "stream") == 0) 1395 sep->se_socktype = SOCK_STREAM; 1396 else if (strcmp(arg, "dgram") == 0) 1397 sep->se_socktype = SOCK_DGRAM; 1398 else if (strcmp(arg, "rdm") == 0) 1399 sep->se_socktype = SOCK_RDM; 1400 else if (strcmp(arg, "seqpacket") == 0) 1401 sep->se_socktype = SOCK_SEQPACKET; 1402 else if (strcmp(arg, "raw") == 0) 1403 sep->se_socktype = SOCK_RAW; 1404 else 1405 sep->se_socktype = -1; 1406 1407 arg = sskip(&cp); 1408 if (sep->se_type == NORM_TYPE && 1409 strncmp(arg, "faith/", strlen("faith/")) == 0) { 1410 arg += strlen("faith/"); 1411 sep->se_type = FAITH_TYPE; 1412 } 1413 sep->se_proto = newstr(arg); 1414 1415 #define MALFORMED(arg) \ 1416 do { \ 1417 syslog(LOG_ERR, "%s: malformed buffer size option `%s'", \ 1418 sep->se_service, (arg)); \ 1419 goto more; \ 1420 } while (0) 1421 1422 #define GETVAL(arg) \ 1423 do { \ 1424 if (!isdigit((unsigned char)*(arg))) \ 1425 MALFORMED(arg); \ 1426 val = strtol((arg), &cp0, 10); \ 1427 if (cp0 != NULL) { \ 1428 if (cp0[1] != '\0') \ 1429 MALFORMED((arg)); \ 1430 if (cp0[0] == 'k') \ 1431 val *= 1024; \ 1432 if (cp0[0] == 'm') \ 1433 val *= 1024 * 1024; \ 1434 } \ 1435 if (val < 1) { \ 1436 syslog(LOG_ERR, "%s: invalid buffer size `%s'", \ 1437 sep->se_service, (arg)); \ 1438 goto more; \ 1439 } \ 1440 } while (0) 1441 1442 #define ASSIGN(arg) \ 1443 do { \ 1444 if (strcmp((arg), "sndbuf") == 0) \ 1445 sep->se_sndbuf = val; \ 1446 else if (strcmp((arg), "rcvbuf") == 0) \ 1447 sep->se_rcvbuf = val; \ 1448 else \ 1449 MALFORMED((arg)); \ 1450 } while (0) 1451 1452 /* 1453 * Extract the send and receive buffer sizes before parsing 1454 * the protocol. 1455 */ 1456 sep->se_sndbuf = sep->se_rcvbuf = 0; 1457 buf0 = buf1 = sz0 = sz1 = NULL; 1458 if ((buf0 = strchr(sep->se_proto, ',')) != NULL) { 1459 /* Not meaningful for Tcpmux services. */ 1460 if (ISMUX(sep)) { 1461 syslog(LOG_ERR, "%s: can't specify buffer sizes for " 1462 "tcpmux services", sep->se_service); 1463 goto more; 1464 } 1465 1466 /* Skip the , */ 1467 *buf0++ = '\0'; 1468 1469 /* Check to see if another socket buffer size was specified. */ 1470 if ((buf1 = strchr(buf0, ',')) != NULL) { 1471 /* Skip the , */ 1472 *buf1++ = '\0'; 1473 1474 /* Make sure a 3rd one wasn't specified. */ 1475 if (strchr(buf1, ',') != NULL) { 1476 syslog(LOG_ERR, "%s: too many buffer sizes", 1477 sep->se_service); 1478 goto more; 1479 } 1480 1481 /* Locate the size. */ 1482 if ((sz1 = strchr(buf1, '=')) == NULL) 1483 MALFORMED(buf1); 1484 1485 /* Skip the = */ 1486 *sz1++ = '\0'; 1487 } 1488 1489 /* Locate the size. */ 1490 if ((sz0 = strchr(buf0, '=')) == NULL) 1491 MALFORMED(buf0); 1492 1493 /* Skip the = */ 1494 *sz0++ = '\0'; 1495 1496 GETVAL(sz0); 1497 ASSIGN(buf0); 1498 1499 if (buf1 != NULL) { 1500 GETVAL(sz1); 1501 ASSIGN(buf1); 1502 } 1503 } 1504 1505 #undef ASSIGN 1506 #undef GETVAL 1507 #undef MALFORMED 1508 1509 if (strcmp(sep->se_proto, "unix") == 0) { 1510 sep->se_family = AF_LOCAL; 1511 } else { 1512 val = strlen(sep->se_proto); 1513 if (!val) { 1514 syslog(LOG_ERR, "%s: invalid protocol specified", 1515 sep->se_service); 1516 goto more; 1517 } 1518 val = sep->se_proto[val - 1]; 1519 switch (val) { 1520 case '4': /*tcp4 or udp4*/ 1521 sep->se_family = AF_INET; 1522 break; 1523 #ifdef INET6 1524 case '6': /*tcp6 or udp6*/ 1525 sep->se_family = AF_INET6; 1526 break; 1527 #endif 1528 default: 1529 sep->se_family = AF_INET; /*will become AF_INET6*/ 1530 break; 1531 } 1532 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1533 #ifdef RPC 1534 char *cp, *ccp; 1535 cp = strchr(sep->se_service, '/'); 1536 if (cp == 0) { 1537 syslog(LOG_ERR, "%s: no rpc version", 1538 sep->se_service); 1539 goto more; 1540 } 1541 *cp++ = '\0'; 1542 sep->se_rpcversl = sep->se_rpcversh = 1543 strtol(cp, &ccp, 0); 1544 if (ccp == cp) { 1545 badafterall: 1546 syslog(LOG_ERR, "%s/%s: bad rpc version", 1547 sep->se_service, cp); 1548 goto more; 1549 } 1550 if (*ccp == '-') { 1551 cp = ccp + 1; 1552 sep->se_rpcversh = strtol(cp, &ccp, 0); 1553 if (ccp == cp) 1554 goto badafterall; 1555 } 1556 #else 1557 syslog(LOG_ERR, "%s: rpc services not suported", 1558 sep->se_service); 1559 goto more; 1560 #endif /* RPC */ 1561 } 1562 } 1563 arg = sskip(&cp); 1564 { 1565 char *cp; 1566 if ((cp = strchr(arg, ':')) == NULL) 1567 cp = strchr(arg, '.'); 1568 if (cp != NULL) { 1569 *cp++ = '\0'; 1570 sep->se_max = atoi(cp); 1571 } else 1572 sep->se_max = TOOMANY; 1573 } 1574 sep->se_wait = strcmp(arg, "wait") == 0; 1575 if (ISMUX(sep)) { 1576 /* 1577 * Silently enforce "nowait" for TCPMUX services since 1578 * they don't have an assigned port to listen on. 1579 */ 1580 sep->se_wait = 0; 1581 1582 if (strncmp(sep->se_proto, "tcp", 3)) { 1583 syslog(LOG_ERR, 1584 "%s: bad protocol for tcpmux service %s", 1585 CONFIG, sep->se_service); 1586 goto more; 1587 } 1588 if (sep->se_socktype != SOCK_STREAM) { 1589 syslog(LOG_ERR, 1590 "%s: bad socket type for tcpmux service %s", 1591 CONFIG, sep->se_service); 1592 goto more; 1593 } 1594 } 1595 sep->se_user = newstr(sskip(&cp)); 1596 if ((sep->se_group = strchr(sep->se_user, ':')) != NULL) 1597 *sep->se_group++ = '\0'; 1598 else if ((sep->se_group = strchr(sep->se_user, '.')) != NULL) 1599 *sep->se_group++ = '\0'; 1600 1601 sep->se_server = newstr(sskip(&cp)); 1602 if (strcmp(sep->se_server, "internal") == 0) { 1603 struct biltin *bi; 1604 1605 for (bi = biltins; bi->bi_service; bi++) 1606 if (bi->bi_socktype == sep->se_socktype && 1607 strcmp(bi->bi_service, sep->se_service) == 0) 1608 break; 1609 if (bi->bi_service == 0) { 1610 syslog(LOG_ERR, "internal service %s unknown", 1611 sep->se_service); 1612 goto more; 1613 } 1614 sep->se_bi = bi; 1615 sep->se_wait = bi->bi_wait; 1616 } else 1617 sep->se_bi = NULL; 1618 argc = 0; 1619 for (arg = skip(&cp); cp; arg = skip(&cp)) { 1620 #if MULOG 1621 char *colon; 1622 1623 if (argc == 0 && (colon = strrchr(arg, ':'))) { 1624 while (arg < colon) { 1625 int x; 1626 char *ccp; 1627 1628 switch (*arg++) { 1629 case 'l': 1630 x = 1; 1631 if (isdigit(*arg)) { 1632 x = strtol(arg, &ccp, 0); 1633 if (ccp == arg) 1634 break; 1635 arg = ccp; 1636 } 1637 sep->se_log &= ~MULOG_RFC931; 1638 sep->se_log |= x; 1639 break; 1640 case 'a': 1641 sep->se_log |= MULOG_RFC931; 1642 break; 1643 default: 1644 break; 1645 } 1646 } 1647 arg = colon + 1; 1648 } 1649 #endif 1650 if (argc < MAXARGV) 1651 sep->se_argv[argc++] = newstr(arg); 1652 } 1653 while (argc <= MAXARGV) 1654 sep->se_argv[argc++] = NULL; 1655 #ifdef IPSEC 1656 sep->se_policy = policy ? newstr(policy) : NULL; 1657 #endif 1658 return (sep); 1659 } 1660 1661 static void 1662 freeconfig(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 static char * 1692 sskip(char **cpp) 1693 { 1694 char *cp; 1695 1696 cp = skip(cpp); 1697 if (cp == NULL) { 1698 syslog(LOG_ERR, "%s: syntax error", CONFIG); 1699 exit(1); 1700 } 1701 return (cp); 1702 } 1703 1704 static char * 1705 skip(char **cpp) 1706 { 1707 char *cp = *cpp; 1708 char *start; 1709 char quote; 1710 1711 if (*cpp == NULL) 1712 return (NULL); 1713 1714 again: 1715 while (*cp == ' ' || *cp == '\t') 1716 cp++; 1717 if (*cp == '\0') { 1718 int c; 1719 1720 c = getc(fconfig); 1721 (void) ungetc(c, fconfig); 1722 if (c == ' ' || c == '\t') 1723 if ((cp = nextline(fconfig))) 1724 goto again; 1725 *cpp = NULL; 1726 return (NULL); 1727 } 1728 start = cp; 1729 quote = '\0'; 1730 while (*cp && (quote || (*cp != ' ' && *cp != '\t'))) { 1731 if (*cp == '\'' || *cp == '"') { 1732 if (quote && *cp != quote) 1733 cp++; 1734 else { 1735 if (quote) 1736 quote = '\0'; 1737 else 1738 quote = *cp; 1739 memmove(cp, cp+1, strlen(cp)); 1740 } 1741 } else 1742 cp++; 1743 } 1744 if (*cp != '\0') 1745 *cp++ = '\0'; 1746 *cpp = cp; 1747 return (start); 1748 } 1749 1750 static char * 1751 nextline(FILE *fd) 1752 { 1753 char *cp; 1754 1755 if (fgets(line, sizeof (line), fd) == NULL) 1756 return (NULL); 1757 cp = strchr(line, '\n'); 1758 if (cp) 1759 *cp = '\0'; 1760 return (line); 1761 } 1762 1763 static char * 1764 newstr(char *cp) 1765 { 1766 if ((cp = strdup((cp != NULL) ? cp : "")) != NULL) 1767 return (cp); 1768 syslog(LOG_ERR, "strdup: %m"); 1769 exit(1); 1770 } 1771 1772 static void 1773 inetd_setproctitle(char *a, int s) 1774 { 1775 socklen_t size; 1776 struct sockaddr_storage ss; 1777 char hbuf[NI_MAXHOST], *hp; 1778 1779 size = sizeof(ss); 1780 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) { 1781 if (getnameinfo((struct sockaddr *)&ss, size, hp = hbuf, 1782 sizeof(hbuf), NULL, 0, niflags) != 0) 1783 hp = "?"; 1784 setproctitle("-%s [%s]", a, hp); 1785 } else 1786 setproctitle("-%s", a); 1787 } 1788 1789 static void 1790 bump_nofile(void) 1791 { 1792 #ifdef RLIMIT_NOFILE 1793 1794 #define FD_CHUNK 32 1795 1796 struct rlimit rl; 1797 1798 if (getrlimit(RLIMIT_NOFILE, &rl) < 0) { 1799 syslog(LOG_ERR, "getrlimit: %m"); 1800 return; 1801 } 1802 rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK); 1803 if (rl.rlim_cur <= rlim_ofile_cur) { 1804 syslog(LOG_ERR, 1805 "bump_nofile: cannot extend file limit, max = %d", 1806 (int)rl.rlim_cur); 1807 return; 1808 } 1809 1810 if (setrlimit(RLIMIT_NOFILE, &rl) < 0) { 1811 syslog(LOG_ERR, "setrlimit: %m"); 1812 return; 1813 } 1814 1815 rlim_ofile_cur = rl.rlim_cur; 1816 return; 1817 1818 #else 1819 syslog(LOG_ERR, "bump_nofile: cannot extend file limit"); 1820 return; 1821 #endif 1822 } 1823 1824 /* 1825 * Internet services provided internally by inetd: 1826 */ 1827 #define BUFSIZE 4096 1828 1829 /* ARGSUSED */ 1830 static void 1831 echo_stream(int s, struct servtab *sep) /* Echo service -- echo data back */ 1832 { 1833 char buffer[BUFSIZE]; 1834 int i; 1835 1836 inetd_setproctitle(sep->se_service, s); 1837 while ((i = read(s, buffer, sizeof(buffer))) > 0 && 1838 write(s, buffer, i) > 0) 1839 ; 1840 } 1841 1842 /* ARGSUSED */ 1843 static void 1844 echo_dg(int s, struct servtab *sep) /* Echo service -- echo data back */ 1845 { 1846 char buffer[BUFSIZE]; 1847 int i; 1848 socklen_t size; 1849 struct sockaddr_storage ss; 1850 struct sockaddr *sa; 1851 1852 sa = (struct sockaddr *)&ss; 1853 size = sizeof(ss); 1854 if ((i = recvfrom(s, buffer, sizeof(buffer), 0, sa, &size)) < 0) 1855 return; 1856 if (port_good_dg(sa)) 1857 (void) sendto(s, buffer, i, 0, sa, size); 1858 } 1859 1860 /* ARGSUSED */ 1861 static void 1862 discard_stream(int s, struct servtab *sep) /* Discard service -- ignore data */ 1863 { 1864 char buffer[BUFSIZE]; 1865 1866 inetd_setproctitle(sep->se_service, s); 1867 while ((errno = 0, read(s, buffer, sizeof(buffer)) > 0) || 1868 errno == EINTR) 1869 ; 1870 } 1871 1872 /* ARGSUSED */ 1873 static void 1874 discard_dg(int s, struct servtab *sep) /* Discard service -- ignore data */ 1875 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 static void 1888 initring(void) 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 static void 1901 chargen_stream(int s,struct servtab *sep) /* Character generator */ 1902 { 1903 int len; 1904 char *rs, text[LINESIZ+2]; 1905 1906 inetd_setproctitle(sep->se_service, s); 1907 1908 if (!endring) { 1909 initring(); 1910 rs = ring; 1911 } 1912 1913 text[LINESIZ] = '\r'; 1914 text[LINESIZ + 1] = '\n'; 1915 for (rs = ring;;) { 1916 if ((len = endring - rs) >= LINESIZ) 1917 memmove(text, rs, LINESIZ); 1918 else { 1919 memmove(text, rs, len); 1920 memmove(text + len, ring, LINESIZ - len); 1921 } 1922 if (++rs == endring) 1923 rs = ring; 1924 if (write(s, text, sizeof(text)) != sizeof(text)) 1925 break; 1926 } 1927 } 1928 1929 /* ARGSUSED */ 1930 static void 1931 chargen_dg(int s, struct servtab *sep) /* Character generator */ 1932 { 1933 struct sockaddr_storage ss; 1934 struct sockaddr *sa; 1935 static char *rs; 1936 int len; 1937 socklen_t size; 1938 char text[LINESIZ+2]; 1939 1940 if (endring == 0) { 1941 initring(); 1942 rs = ring; 1943 } 1944 1945 sa = (struct sockaddr *)&ss; 1946 size = sizeof(ss); 1947 if (recvfrom(s, text, sizeof(text), 0, sa, &size) < 0) 1948 return; 1949 1950 if (!port_good_dg(sa)) 1951 return; 1952 1953 if ((len = endring - rs) >= LINESIZ) 1954 memmove(text, rs, LINESIZ); 1955 else { 1956 memmove(text, rs, len); 1957 memmove(text + len, ring, LINESIZ - len); 1958 } 1959 if (++rs == endring) 1960 rs = ring; 1961 text[LINESIZ] = '\r'; 1962 text[LINESIZ + 1] = '\n'; 1963 (void) sendto(s, text, sizeof(text), 0, sa, size); 1964 } 1965 1966 /* 1967 * Return a machine readable date and time, in the form of the 1968 * number of seconds since midnight, Jan 1, 1900. Since gettimeofday 1969 * returns the number of seconds since midnight, Jan 1, 1970, 1970 * we must add 2208988800 seconds to this figure to make up for 1971 * some seventy years Bell Labs was asleep. 1972 */ 1973 1974 static uint32_t 1975 machtime(void) 1976 { 1977 struct timeval tv; 1978 1979 if (gettimeofday(&tv, NULL) < 0) { 1980 if (debug) 1981 fprintf(stderr, "Unable to get time of day\n"); 1982 return (0); 1983 } 1984 #define OFFSET ((uint32_t)25567 * 24*60*60) 1985 return (htonl((uint32_t)(tv.tv_sec + OFFSET))); 1986 #undef OFFSET 1987 } 1988 1989 /* ARGSUSED */ 1990 static void 1991 machtime_stream(int s, struct servtab *sep) 1992 { 1993 uint32_t result; 1994 1995 result = machtime(); 1996 (void) write(s, (char *) &result, sizeof(result)); 1997 } 1998 1999 /* ARGSUSED */ 2000 void 2001 machtime_dg(int s, struct servtab *sep) 2002 { 2003 uint32_t result; 2004 struct sockaddr_storage ss; 2005 struct sockaddr *sa; 2006 socklen_t size; 2007 2008 sa = (struct sockaddr *)&ss; 2009 size = sizeof(ss); 2010 if (recvfrom(s, (char *)&result, sizeof(result), 0, sa, &size) < 0) 2011 return; 2012 if (!port_good_dg(sa)) 2013 return; 2014 result = machtime(); 2015 (void) sendto(s, (char *) &result, sizeof(result), 0, sa, size); 2016 } 2017 2018 /* ARGSUSED */ 2019 static void 2020 daytime_stream(int s,struct servtab *sep) 2021 /* Return human-readable time of day */ 2022 { 2023 char buffer[256]; 2024 time_t clock; 2025 int len; 2026 2027 clock = time((time_t *) 0); 2028 2029 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 2030 (void) write(s, buffer, len); 2031 } 2032 2033 /* ARGSUSED */ 2034 void 2035 daytime_dg(int s, struct servtab *sep) 2036 /* Return human-readable time of day */ 2037 { 2038 char buffer[256]; 2039 time_t clock; 2040 struct sockaddr_storage ss; 2041 struct sockaddr *sa; 2042 socklen_t size; 2043 int len; 2044 2045 clock = time((time_t *) 0); 2046 2047 sa = (struct sockaddr *)&ss; 2048 size = sizeof(ss); 2049 if (recvfrom(s, buffer, sizeof(buffer), 0, sa, &size) < 0) 2050 return; 2051 if (!port_good_dg(sa)) 2052 return; 2053 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 2054 (void) sendto(s, buffer, len, 0, sa, size); 2055 } 2056 2057 /* 2058 * print_service: 2059 * Dump relevant information to stderr 2060 */ 2061 static void 2062 print_service(char *action, struct servtab *sep) 2063 { 2064 2065 if (isrpcservice(sep)) 2066 fprintf(stderr, 2067 "%s: %s rpcprog=%d, rpcvers = %d/%d, proto=%s, wait.max=%d.%d, user:group=%s:%s builtin=%lx server=%s" 2068 #ifdef IPSEC 2069 " policy=\"%s\"" 2070 #endif 2071 "\n", 2072 action, sep->se_service, 2073 sep->se_rpcprog, sep->se_rpcversh, sep->se_rpcversl, sep->se_proto, 2074 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 2075 (long)sep->se_bi, sep->se_server 2076 #ifdef IPSEC 2077 , (sep->se_policy ? sep->se_policy : "") 2078 #endif 2079 ); 2080 else 2081 fprintf(stderr, 2082 "%s: %s proto=%s%s, wait.max=%d.%d, user:group=%s:%s builtin=%lx server=%s" 2083 #ifdef IPSEC 2084 " policy=%s" 2085 #endif 2086 "\n", 2087 action, sep->se_service, 2088 sep->se_type == FAITH_TYPE ? "faith/" : "", 2089 sep->se_proto, 2090 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 2091 (long)sep->se_bi, sep->se_server 2092 #ifdef IPSEC 2093 , (sep->se_policy ? sep->se_policy : "") 2094 #endif 2095 ); 2096 } 2097 2098 static void 2099 usage(void) 2100 { 2101 #ifdef LIBWRAP 2102 (void)fprintf(stderr, "usage: %s [-dl] [conf]\n", getprogname()); 2103 #else 2104 (void)fprintf(stderr, "usage: %s [-d] [conf]\n", getprogname()); 2105 #endif 2106 exit(1); 2107 } 2108 2109 2110 /* 2111 * Based on TCPMUX.C by Mark K. Lottor November 1988 2112 * sri-nic::ps:<mkl>tcpmux.c 2113 */ 2114 2115 static int /* # of characters upto \r,\n or \0 */ 2116 getline(int fd, char *buf, int len) 2117 { 2118 int count = 0, n; 2119 2120 do { 2121 n = read(fd, buf, len-count); 2122 if (n == 0) 2123 return (count); 2124 if (n < 0) 2125 return (-1); 2126 while (--n >= 0) { 2127 if (*buf == '\r' || *buf == '\n' || *buf == '\0') 2128 return (count); 2129 count++; 2130 buf++; 2131 } 2132 } while (count < len); 2133 return (count); 2134 } 2135 2136 #define MAX_SERV_LEN (256+2) /* 2 bytes for \r\n */ 2137 2138 #define strwrite(fd, buf) (void) write(fd, buf, sizeof(buf)-1) 2139 2140 static void 2141 tcpmux(int ctrl, struct servtab *sep) 2142 { 2143 char service[MAX_SERV_LEN+1]; 2144 int len; 2145 2146 /* Get requested service name */ 2147 if ((len = getline(ctrl, service, MAX_SERV_LEN)) < 0) { 2148 strwrite(ctrl, "-Error reading service name\r\n"); 2149 goto reject; 2150 } 2151 service[len] = '\0'; 2152 2153 if (debug) 2154 fprintf(stderr, "tcpmux: someone wants %s\n", service); 2155 2156 /* 2157 * Help is a required command, and lists available services, 2158 * one per line. 2159 */ 2160 if (!strcasecmp(service, "help")) { 2161 strwrite(ctrl, "+Available services:\r\n"); 2162 strwrite(ctrl, "help\r\n"); 2163 for (sep = servtab; sep != NULL; sep = sep->se_next) { 2164 if (!ISMUX(sep)) 2165 continue; 2166 (void)write(ctrl, sep->se_service, 2167 strlen(sep->se_service)); 2168 strwrite(ctrl, "\r\n"); 2169 } 2170 goto reject; 2171 } 2172 2173 /* Try matching a service in inetd.conf with the request */ 2174 for (sep = servtab; sep != NULL; sep = sep->se_next) { 2175 if (!ISMUX(sep)) 2176 continue; 2177 if (!strcasecmp(service, sep->se_service)) { 2178 if (ISMUXPLUS(sep)) 2179 strwrite(ctrl, "+Go\r\n"); 2180 run_service(ctrl, sep); 2181 return; 2182 } 2183 } 2184 strwrite(ctrl, "-Service not available\r\n"); 2185 reject: 2186 _exit(1); 2187 } 2188 2189 #ifdef MULOG 2190 void 2191 dolog(struct servtab *sep, int ctrl) 2192 { 2193 struct sockaddr_storage ss; 2194 struct sockaddr *sa = (struct sockaddr *)&ss; 2195 socklen_t len = sizeof(ss); 2196 char *host, *dp, buf[BUFSIZ]; 2197 int connected = 1; 2198 2199 switch (sep->se_family) { 2200 case AF_INET: 2201 #ifdef INET6 2202 case AF_INET6: 2203 #endif 2204 break; 2205 default: 2206 return; 2207 } 2208 2209 if (getpeername(ctrl, sa, &len) < 0) { 2210 if (errno != ENOTCONN) { 2211 syslog(LOG_ERR, "getpeername: %m"); 2212 return; 2213 } 2214 if (recvfrom(ctrl, buf, sizeof(buf), MSG_PEEK, sa, &len) < 0) { 2215 syslog(LOG_ERR, "recvfrom: %m"); 2216 return; 2217 } 2218 connected = 0; 2219 } 2220 switch (sa->sa_family) { 2221 case AF_INET: 2222 #ifdef INET6 2223 case AF_INET6: 2224 #endif 2225 break; 2226 default: 2227 syslog(LOG_ERR, "unexpected address family %u", sa->sa_family); 2228 return; 2229 } 2230 2231 if (getnameinfo(sa, len, buf, sizeof(buf), NULL, 0, 0) != 0) 2232 strlcpy(buf, "?", sizeof(buf)); 2233 host = buf; 2234 2235 switch (sep->se_log & ~MULOG_RFC931) { 2236 case 0: 2237 return; 2238 case 1: 2239 if (curdom == NULL || *curdom == '\0') 2240 break; 2241 dp = host + strlen(host) - strlen(curdom); 2242 if (dp < host) 2243 break; 2244 if (debug) 2245 fprintf(stderr, "check \"%s\" against curdom \"%s\"\n", 2246 host, curdom); 2247 if (strcasecmp(dp, curdom) == 0) 2248 return; 2249 break; 2250 case 2: 2251 default: 2252 break; 2253 } 2254 2255 openlog("", LOG_NOWAIT, MULOG); 2256 2257 if (connected && (sep->se_log & MULOG_RFC931)) 2258 syslog(LOG_INFO, "%s@%s wants %s", 2259 rfc931_name(sa, ctrl), host, sep->se_service); 2260 else 2261 syslog(LOG_INFO, "%s wants %s", 2262 host, sep->se_service); 2263 } 2264 2265 /* 2266 * From tcp_log by 2267 * Wietse Venema, Eindhoven University of Technology, The Netherlands. 2268 */ 2269 #if 0 2270 static char sccsid[] = "@(#) rfc931.c 1.3 92/08/31 22:54:46"; 2271 #endif 2272 2273 #include <setjmp.h> 2274 2275 #define RFC931_PORT 113 /* Semi-well-known port */ 2276 #define TIMEOUT 4 2277 #define TIMEOUT2 10 2278 2279 static jmp_buf timebuf; 2280 2281 /* timeout - handle timeouts */ 2282 2283 static void 2284 timeout(int sig) 2285 { 2286 longjmp(timebuf, sig); 2287 } 2288 2289 /* rfc931_name - return remote user name */ 2290 2291 char * 2292 rfc931_name(struct sockaddr *there, /* remote link information */ 2293 int ctrl) 2294 { 2295 struct sockaddr_storage here; /* local link information */ 2296 struct sockaddr_storage sin; /* for talking to RFC931 daemon */ 2297 socklen_t length; 2298 int s; 2299 unsigned remote; 2300 unsigned local; 2301 static char user[256]; /* XXX */ 2302 char buf[256]; 2303 char *cp; 2304 char *result = "USER_UNKNOWN"; 2305 int len; 2306 u_int16_t myport, hisport; 2307 2308 /* Find out local port number of our stdin. */ 2309 2310 length = sizeof(here); 2311 if (getsockname(ctrl, (struct sockaddr *) &here, &length) == -1) { 2312 syslog(LOG_ERR, "getsockname: %m"); 2313 return (result); 2314 } 2315 switch (here.ss_family) { 2316 case AF_INET: 2317 myport = ((struct sockaddr_in *)&here)->sin_port; 2318 break; 2319 #ifdef INET6 2320 case AF_INET6: 2321 myport = ((struct sockaddr_in6 *)&here)->sin6_port; 2322 break; 2323 #endif 2324 } 2325 switch (there->sa_family) { 2326 case AF_INET: 2327 hisport = ((struct sockaddr_in *)&there)->sin_port; 2328 break; 2329 #ifdef INET6 2330 case AF_INET6: 2331 hisport = ((struct sockaddr_in6 *)&there)->sin6_port; 2332 break; 2333 #endif 2334 } 2335 /* Set up timer so we won't get stuck. */ 2336 2337 if ((s = socket(here.ss_family, SOCK_STREAM, 0)) == -1) { 2338 syslog(LOG_ERR, "socket: %m"); 2339 return (result); 2340 } 2341 2342 sin = here; 2343 switch (sin.ss_family) { 2344 case AF_INET: 2345 ((struct sockaddr_in *)&sin)->sin_port = htons(0); 2346 break; 2347 #ifdef INET6 2348 case AF_INET6: 2349 ((struct sockaddr_in6 *)&sin)->sin6_port = htons(0); 2350 break; 2351 #endif 2352 } 2353 if (bind(s, (struct sockaddr *) &sin, sin.ss_len) == -1) { 2354 syslog(LOG_ERR, "bind: %m"); 2355 return (result); 2356 } 2357 2358 signal(SIGALRM, timeout); 2359 if (setjmp(timebuf)) { 2360 close(s); /* not: fclose(fp) */ 2361 return (result); 2362 } 2363 alarm(TIMEOUT); 2364 2365 /* Connect to the RFC931 daemon. */ 2366 2367 memcpy(&sin, there, there->sa_len); 2368 switch (sin.ss_family) { 2369 case AF_INET: 2370 ((struct sockaddr_in *)&sin)->sin_port = htons(RFC931_PORT); 2371 break; 2372 #ifdef INET6 2373 case AF_INET6: 2374 ((struct sockaddr_in6 *)&sin)->sin6_port = htons(RFC931_PORT); 2375 break; 2376 #endif 2377 } 2378 if (connect(s, (struct sockaddr *) &sin, sin.ss_len) == -1) { 2379 close(s); 2380 alarm(0); 2381 return (result); 2382 } 2383 2384 /* Query the RFC 931 server. Would 13-byte writes ever be broken up? */ 2385 (void)snprintf(buf, sizeof buf, "%u,%u\r\n", ntohs(hisport), 2386 ntohs(myport)); 2387 2388 for (len = 0, cp = buf; len < strlen(buf); ) { 2389 int n; 2390 2391 if ((n = write(s, cp, strlen(buf) - len)) == -1) { 2392 close(s); 2393 alarm(0); 2394 return (result); 2395 } 2396 cp += n; 2397 len += n; 2398 } 2399 2400 /* Read response */ 2401 for (cp = buf; cp < buf + sizeof(buf) - 1; ) { 2402 char c; 2403 if (read(s, &c, 1) != 1) { 2404 close(s); 2405 alarm(0); 2406 return (result); 2407 } 2408 if (c == '\n') 2409 break; 2410 *cp++ = c; 2411 } 2412 *cp = '\0'; 2413 2414 if (sscanf(buf, "%u , %u : USERID :%*[^:]:%255s", &remote, &local, 2415 user) == 3 && ntohs(hisport) == remote && ntohs(myport) == local) { 2416 /* Strip trailing carriage return. */ 2417 if ((cp = strchr(user, '\r')) != NULL) 2418 *cp = 0; 2419 result = user; 2420 } 2421 2422 alarm(0); 2423 close(s); 2424 return (result); 2425 } 2426 #endif 2427 2428 /* 2429 * check if the address/port where send data to is one of the obvious ports 2430 * that are used for denial of service attacks like two echo ports 2431 * just echoing data between them 2432 */ 2433 static int 2434 port_good_dg(struct sockaddr *sa) 2435 { 2436 struct in_addr in; 2437 #ifdef INET6 2438 struct in6_addr *in6; 2439 #endif 2440 u_int16_t port; 2441 int i, bad; 2442 char hbuf[NI_MAXHOST]; 2443 2444 bad = 0; 2445 2446 switch (sa->sa_family) { 2447 case AF_INET: 2448 in.s_addr = ntohl(((struct sockaddr_in *)sa)->sin_addr.s_addr); 2449 port = ntohs(((struct sockaddr_in *)sa)->sin_port); 2450 #ifdef INET6 2451 v4chk: 2452 #endif 2453 if (IN_MULTICAST(in.s_addr)) 2454 goto bad; 2455 switch ((in.s_addr & 0xff000000) >> 24) { 2456 case 0: case 127: case 255: 2457 goto bad; 2458 } 2459 if (dg_broadcast(&in)) 2460 goto bad; 2461 break; 2462 #ifdef INET6 2463 case AF_INET6: 2464 in6 = &((struct sockaddr_in6 *)sa)->sin6_addr; 2465 port = ntohs(((struct sockaddr_in6 *)sa)->sin6_port); 2466 if (IN6_IS_ADDR_MULTICAST(in6) || IN6_IS_ADDR_UNSPECIFIED(in6)) 2467 goto bad; 2468 if (IN6_IS_ADDR_V4MAPPED(in6) || IN6_IS_ADDR_V4COMPAT(in6)) { 2469 memcpy(&in, &in6->s6_addr[12], sizeof(in)); 2470 in.s_addr = ntohl(in.s_addr); 2471 goto v4chk; 2472 } 2473 break; 2474 #endif 2475 default: 2476 /* XXX unsupported af, is it safe to assume it to be safe? */ 2477 return (1); 2478 } 2479 2480 for (i = 0; bad_ports[i] != 0; i++) { 2481 if (port == bad_ports[i]) 2482 goto bad; 2483 } 2484 2485 return (1); 2486 2487 bad: 2488 if (getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), NULL, 0, 2489 niflags) != 0) 2490 strlcpy(hbuf, "?", sizeof(hbuf)); 2491 syslog(LOG_WARNING,"Possible DoS attack from %s, Port %d", 2492 hbuf, port); 2493 return (0); 2494 } 2495 2496 /* XXX need optimization */ 2497 static int 2498 dg_broadcast(struct in_addr *in) 2499 { 2500 struct ifaddrs *ifa, *ifap; 2501 struct sockaddr_in *sin; 2502 2503 if (getifaddrs(&ifap) < 0) 2504 return (0); 2505 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 2506 if (ifa->ifa_addr->sa_family != AF_INET || 2507 (ifa->ifa_flags & IFF_BROADCAST) == 0) 2508 continue; 2509 sin = (struct sockaddr_in *)ifa->ifa_broadaddr; 2510 if (sin->sin_addr.s_addr == in->s_addr) { 2511 freeifaddrs(ifap); 2512 return (1); 2513 } 2514 } 2515 freeifaddrs(ifap); 2516 return (0); 2517 } 2518 2519 static int 2520 my_kevent(const struct kevent *changelist, size_t nchanges, 2521 struct kevent *eventlist, size_t nevents) 2522 { 2523 int result; 2524 2525 while ((result = kevent(kq, changelist, nchanges, eventlist, nevents, 2526 NULL)) < 0) 2527 if (errno != EINTR) { 2528 syslog(LOG_ERR, "kevent: %m"); 2529 exit(EXIT_FAILURE); 2530 } 2531 2532 return (result); 2533 } 2534 2535 static struct kevent * 2536 allocchange(void) 2537 { 2538 if (changes == A_CNT(changebuf)) { 2539 (void) my_kevent(changebuf, A_CNT(changebuf), NULL, 0); 2540 changes = 0; 2541 } 2542 2543 return (&changebuf[changes++]); 2544 } 2545
Indexes created Thu Sep 25 16:09:42 GMT 2025