inetd.c revision 1.103.10.1
1 /* $NetBSD: inetd.c,v 1.103.10.1 2008/05/18 12:36:18 yamt 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 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1983, 1991, 1993, 1994 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 */ 61 62 #include <sys/cdefs.h> 63 #ifndef lint 64 __COPYRIGHT("@(#) Copyright (c) 1983, 1991, 1993, 1994\n\ 65 The Regents of the University of California. All rights reserved.\n"); 66 #if 0 67 static char sccsid[] = "@(#)inetd.c 8.4 (Berkeley) 4/13/94"; 68 #else 69 __RCSID("$NetBSD: inetd.c,v 1.103.10.1 2008/05/18 12:36:18 yamt Exp $"); 70 #endif 71 #endif /* not lint */ 72 73 /* 74 * Inetd - Internet super-server 75 * 76 * This program invokes all internet services as needed. Connection-oriented 77 * services are invoked each time a connection is made, by creating a process. 78 * This process is passed the connection as file descriptor 0 and is expected 79 * to do a getpeername to find out the source host and port. 80 * 81 * Datagram oriented services are invoked when a datagram 82 * arrives; a process is created and passed a pending message 83 * on file descriptor 0. Datagram servers may either connect 84 * to their peer, freeing up the original socket for inetd 85 * to receive further messages on, or ``take over the socket'', 86 * processing all arriving datagrams and, eventually, timing 87 * out. The first type of server is said to be ``multi-threaded''; 88 * the second type of server ``single-threaded''. 89 * 90 * Inetd uses a configuration file which is read at startup 91 * and, possibly, at some later time in response to a hangup signal. 92 * The configuration file is ``free format'' with fields given in the 93 * order shown below. Continuation lines for an entry must being with 94 * a space or tab. All fields must be present in each entry. 95 * 96 * service name must be in /etc/services or must 97 * name a tcpmux service 98 * socket type stream/dgram/raw/rdm/seqpacket 99 * protocol must be in /etc/protocols 100 * wait/nowait[:max] single-threaded/multi-threaded, max # 101 * user[:group] user/group to run daemon as 102 * server program full path name 103 * server program arguments maximum of MAXARGS (20) 104 * 105 * For RPC services 106 * service name/version must be in /etc/rpc 107 * socket type stream/dgram/raw/rdm/seqpacket 108 * protocol must be in /etc/protocols 109 * wait/nowait[:max] single-threaded/multi-threaded 110 * user[:group] user to run daemon as 111 * server program full path name 112 * server program arguments maximum of MAXARGS (20) 113 * 114 * For non-RPC services, the "service name" can be of the form 115 * hostaddress:servicename, in which case the hostaddress is used 116 * as the host portion of the address to listen on. If hostaddress 117 * consists of a single `*' character, INADDR_ANY is used. 118 * 119 * A line can also consist of just 120 * hostaddress: 121 * where hostaddress is as in the preceding paragraph. Such a line must 122 * have no further fields; the specified hostaddress is remembered and 123 * used for all further lines that have no hostaddress specified, 124 * until the next such line (or EOF). (This is why * is provided to 125 * allow explicit specification of INADDR_ANY.) A line 126 * *: 127 * is implicitly in effect at the beginning of the file. 128 * 129 * The hostaddress specifier may (and often will) contain dots; 130 * the service name must not. 131 * 132 * For RPC services, host-address specifiers are accepted and will 133 * work to some extent; however, because of limitations in the 134 * portmapper interface, it will not work to try to give more than 135 * one line for any given RPC service, even if the host-address 136 * specifiers are different. 137 * 138 * TCP services without official port numbers are handled with the 139 * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for 140 * requests. When a connection is made from a foreign host, the service 141 * requested is passed to tcpmux, which looks it up in the servtab list 142 * and returns the proper entry for the service. Tcpmux returns a 143 * negative reply if the service doesn't exist, otherwise the invoked 144 * server is expected to return the positive reply if the service type in 145 * inetd.conf file has the prefix "tcpmux/". If the service type has the 146 * prefix "tcpmux/+", tcpmux will return the positive reply for the 147 * process; this is for compatibility with older server code, and also 148 * allows you to invoke programs that use stdin/stdout without putting any 149 * special server code in them. Services that use tcpmux are "nowait" 150 * because they do not have a well-known port and hence cannot listen 151 * for new requests. 152 * 153 * Comment lines are indicated by a `#' in column 1. 154 * 155 * #ifdef IPSEC 156 * Comment lines that start with "#@" denote IPsec policy string, as described 157 * in ipsec_set_policy(3). This will affect all the following items in 158 * inetd.conf(8). To reset the policy, just use "#@" line. By default, 159 * there's no IPsec policy. 160 * #endif 161 */ 162 163 /* 164 * Here's the scoop concerning the user:group feature: 165 * 166 * 1) set-group-option off. 167 * 168 * a) user = root: NO setuid() or setgid() is done 169 * 170 * b) other: setuid() 171 * setgid(primary group as found in passwd) 172 * initgroups(name, primary group) 173 * 174 * 2) set-group-option on. 175 * 176 * a) user = root: NO setuid() 177 * setgid(specified group) 178 * NO initgroups() 179 * 180 * b) other: setuid() 181 * setgid(specified group) 182 * initgroups(name, specified group) 183 * 184 */ 185 186 #include <sys/param.h> 187 #include <sys/stat.h> 188 #include <sys/ioctl.h> 189 #include <sys/socket.h> 190 #include <sys/un.h> 191 #include <sys/wait.h> 192 #include <sys/time.h> 193 #include <sys/resource.h> 194 #include <sys/event.h> 195 196 #ifndef RLIMIT_NOFILE 197 #define RLIMIT_NOFILE RLIMIT_OFILE 198 #endif 199 200 #ifndef NO_RPC 201 #define RPC 202 #endif 203 204 #include <net/if.h> 205 206 #include <netinet/in.h> 207 #include <arpa/inet.h> 208 #ifdef RPC 209 #include <rpc/rpc.h> 210 #include <rpc/rpcb_clnt.h> 211 #include <netconfig.h> 212 #endif 213 214 #include <ctype.h> 215 #include <errno.h> 216 #include <fcntl.h> 217 #include <grp.h> 218 #include <netdb.h> 219 #include <pwd.h> 220 #include <signal.h> 221 #include <stdio.h> 222 #include <stdlib.h> 223 #include <string.h> 224 #include <syslog.h> 225 #include <unistd.h> 226 #include <util.h> 227 #include <ifaddrs.h> 228 229 #include "pathnames.h" 230 231 #ifdef IPSEC 232 #include <netinet6/ipsec.h> 233 #ifndef IPSEC_POLICY_IPSEC /* no ipsec support on old ipsec */ 234 #undef IPSEC 235 #endif 236 #include "ipsec.h" 237 #endif 238 239 #ifdef LIBWRAP 240 # include <tcpd.h> 241 #ifndef LIBWRAP_ALLOW_FACILITY 242 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH 243 #endif 244 #ifndef LIBWRAP_ALLOW_SEVERITY 245 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO 246 #endif 247 #ifndef LIBWRAP_DENY_FACILITY 248 # define LIBWRAP_DENY_FACILITY LOG_AUTH 249 #endif 250 #ifndef LIBWRAP_DENY_SEVERITY 251 # define LIBWRAP_DENY_SEVERITY LOG_WARNING 252 #endif 253 int allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY; 254 int deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY; 255 #endif 256 257 #define TOOMANY 40 /* don't start more than TOOMANY */ 258 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */ 259 #define RETRYTIME (60*10) /* retry after bind or server fail */ 260 261 #define A_CNT(a) (sizeof (a) / sizeof (a[0])) 262 263 int debug; 264 #ifdef LIBWRAP 265 int lflag; 266 #endif 267 int maxsock; 268 int kq; 269 int options; 270 int timingout; 271 struct servent *sp; 272 char *curdom; 273 const int niflags = NI_NUMERICHOST | NI_NUMERICSERV; 274 275 #ifndef OPEN_MAX 276 #define OPEN_MAX 64 277 #endif 278 279 /* Reserve some descriptors, 3 stdio + at least: 1 log, 1 conf. file */ 280 #define FD_MARGIN (8) 281 rlim_t rlim_ofile_cur = OPEN_MAX; 282 283 #ifdef RLIMIT_NOFILE 284 struct rlimit rlim_ofile; 285 #endif 286 287 struct kevent changebuf[64]; 288 size_t changes; 289 290 struct servtab { 291 char *se_hostaddr; /* host address to listen on */ 292 char *se_service; /* name of service */ 293 int se_socktype; /* type of socket to use */ 294 int se_family; /* address family */ 295 char *se_proto; /* protocol used */ 296 int se_sndbuf; /* sndbuf size */ 297 int se_rcvbuf; /* rcvbuf size */ 298 int se_rpcprog; /* rpc program number */ 299 int se_rpcversl; /* rpc program lowest version */ 300 int se_rpcversh; /* rpc program highest version */ 301 #define isrpcservice(sep) ((sep)->se_rpcversl != 0) 302 pid_t se_wait; /* single threaded server */ 303 short se_checked; /* looked at during merge */ 304 char *se_user; /* user name to run as */ 305 char *se_group; /* group name to run as */ 306 struct biltin *se_bi; /* if built-in, description */ 307 char *se_server; /* server program */ 308 #define MAXARGV 20 309 char *se_argv[MAXARGV+1]; /* program arguments */ 310 #ifdef IPSEC 311 char *se_policy; /* IPsec poilcy string */ 312 #endif 313 int se_fd; /* open descriptor */ 314 int se_type; /* type */ 315 union { 316 struct sockaddr se_un_ctrladdr; 317 struct sockaddr_in se_un_ctrladdr_in; 318 struct sockaddr_in6 se_un_ctrladdr_in6; 319 struct sockaddr_un se_un_ctrladdr_un; 320 } se_un; /* bound address */ 321 #define se_ctrladdr se_un.se_un_ctrladdr 322 #define se_ctrladdr_in se_un.se_un_ctrladdr_in 323 #define se_ctrladdr_un se_un.se_un_ctrladdr_un 324 int se_ctrladdr_size; 325 int se_max; /* max # of instances of this service */ 326 int se_count; /* number started since se_time */ 327 struct timeval se_time; /* start of se_count */ 328 #ifdef MULOG 329 int se_log; 330 #define MULOG_RFC931 0x40000000 331 #endif 332 struct servtab *se_next; 333 } *servtab; 334 335 #define NORM_TYPE 0 336 #define MUX_TYPE 1 337 #define MUXPLUS_TYPE 2 338 #define FAITH_TYPE 3 339 #define ISMUX(sep) (((sep)->se_type == MUX_TYPE) || \ 340 ((sep)->se_type == MUXPLUS_TYPE)) 341 #define ISMUXPLUS(sep) ((sep)->se_type == MUXPLUS_TYPE) 342 343 344 static void chargen_dg(int, struct servtab *); 345 static void chargen_stream(int, struct servtab *); 346 static void close_sep(struct servtab *); 347 static void config(void); 348 static void daytime_dg(int, struct servtab *); 349 static void daytime_stream(int, struct servtab *); 350 static void discard_dg(int, struct servtab *); 351 static void discard_stream(int, struct servtab *); 352 static void echo_dg(int, struct servtab *); 353 static void echo_stream(int, struct servtab *); 354 static void endconfig(void); 355 static struct servtab *enter(struct servtab *); 356 static void freeconfig(struct servtab *); 357 static struct servtab *getconfigent(void); 358 static void goaway(void); 359 static void machtime_dg(int, struct servtab *); 360 static void machtime_stream(int, struct servtab *); 361 static char *newstr(char *); 362 static char *nextline(FILE *); 363 static void print_service(char *, struct servtab *); 364 static void reapchild(void); 365 static void retry(void); 366 static void run_service(int, struct servtab *); 367 static int setconfig(void); 368 static void setup(struct servtab *); 369 static char *sskip(char **); 370 static char *skip(char **); 371 static void tcpmux(int, struct servtab *); 372 static void usage(void); 373 static void register_rpc(struct servtab *); 374 static void unregister_rpc(struct servtab *); 375 static void bump_nofile(void); 376 static void inetd_setproctitle(char *, int); 377 static void initring(void); 378 static uint32_t machtime(void); 379 static int port_good_dg(struct sockaddr *); 380 static int dg_broadcast(struct in_addr *); 381 static int my_kevent(const struct kevent *, size_t, struct kevent *, 382 size_t); 383 static struct kevent * allocchange(void); 384 static int getline(int, char *, int); 385 static void spawn(struct servtab *, int); 386 #ifdef MULOG 387 static void dolog(struct servtab *, int); 388 static void timeout(int); 389 static char *rfc931_name(struct sockaddr *, int); 390 #endif 391 392 struct biltin { 393 char *bi_service; /* internally provided service name */ 394 int bi_socktype; /* type of socket supported */ 395 short bi_fork; /* 1 if should fork before call */ 396 short bi_wait; /* 1 if should wait for child */ 397 void (*bi_fn)(int, struct servtab *); 398 /* function which performs it */ 399 } biltins[] = { 400 /* Echo received data */ 401 { "echo", SOCK_STREAM, 1, 0, echo_stream }, 402 { "echo", SOCK_DGRAM, 0, 0, echo_dg }, 403 404 /* Internet /dev/null */ 405 { "discard", SOCK_STREAM, 1, 0, discard_stream }, 406 { "discard", SOCK_DGRAM, 0, 0, discard_dg }, 407 408 /* Return 32 bit time since 1970 */ 409 { "time", SOCK_STREAM, 0, 0, machtime_stream }, 410 { "time", SOCK_DGRAM, 0, 0, machtime_dg }, 411 412 /* Return human-readable time */ 413 { "daytime", SOCK_STREAM, 0, 0, daytime_stream }, 414 { "daytime", SOCK_DGRAM, 0, 0, daytime_dg }, 415 416 /* Familiar character generator */ 417 { "chargen", SOCK_STREAM, 1, 0, chargen_stream }, 418 { "chargen", SOCK_DGRAM, 0, 0, chargen_dg }, 419 420 { "tcpmux", SOCK_STREAM, 1, 0, tcpmux }, 421 422 { NULL } 423 }; 424 425 /* list of "bad" ports. I.e. ports that are most obviously used for 426 * "cycling packets" denial of service attacks. See /etc/services. 427 * List must end with port number "0". 428 */ 429 430 u_int16_t bad_ports[] = { 7, 9, 13, 19, 37, 0 }; 431 432 433 #define NUMINT (sizeof(intab) / sizeof(struct inent)) 434 char *CONFIG = _PATH_INETDCONF; 435 436 static int my_signals[] = 437 { SIGALRM, SIGHUP, SIGCHLD, SIGTERM, SIGINT, SIGPIPE }; 438 439 int 440 main(int argc, char *argv[]) 441 { 442 int ch, n, reload = 1; 443 444 while ((ch = getopt(argc, argv, 445 #ifdef LIBWRAP 446 "dl" 447 #else 448 "d" 449 #endif 450 )) != -1) 451 switch(ch) { 452 case 'd': 453 debug = 1; 454 options |= SO_DEBUG; 455 break; 456 #ifdef LIBWRAP 457 case 'l': 458 lflag = 1; 459 break; 460 #endif 461 case '?': 462 default: 463 usage(); 464 } 465 argc -= optind; 466 argv += optind; 467 468 if (argc > 0) 469 CONFIG = argv[0]; 470 471 if (!debug) 472 daemon(0, 0); 473 openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON); 474 pidfile(NULL); 475 476 kq = kqueue(); 477 if (kq < 0) { 478 syslog(LOG_ERR, "kqueue: %m"); 479 return (EXIT_FAILURE); 480 } 481 482 #ifdef RLIMIT_NOFILE 483 if (getrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) { 484 syslog(LOG_ERR, "getrlimit: %m"); 485 } else { 486 rlim_ofile_cur = rlim_ofile.rlim_cur; 487 if (rlim_ofile_cur == RLIM_INFINITY) /* ! */ 488 rlim_ofile_cur = OPEN_MAX; 489 } 490 #endif 491 492 for (n = 0; n < (int)A_CNT(my_signals); n++) { 493 int signum; 494 495 signum = my_signals[n]; 496 if (signum != SIGCHLD) 497 (void) signal(signum, SIG_IGN); 498 499 if (signum != SIGPIPE) { 500 struct kevent *ev; 501 502 ev = allocchange(); 503 EV_SET(ev, signum, EVFILT_SIGNAL, EV_ADD | EV_ENABLE, 504 0, 0, 0); 505 } 506 } 507 508 for (;;) { 509 int ctrl; 510 struct kevent eventbuf[64], *ev; 511 struct servtab *sep; 512 513 if (reload) { 514 reload = 0; 515 config(); 516 } 517 518 n = my_kevent(changebuf, changes, eventbuf, A_CNT(eventbuf)); 519 changes = 0; 520 521 for (ev = eventbuf; n > 0; ev++, n--) { 522 if (ev->filter == EVFILT_SIGNAL) { 523 switch (ev->ident) { 524 case SIGALRM: 525 retry(); 526 break; 527 case SIGCHLD: 528 reapchild(); 529 break; 530 case SIGTERM: 531 case SIGINT: 532 goaway(); 533 break; 534 case SIGHUP: 535 reload = 1; 536 break; 537 } 538 continue; 539 } 540 if (ev->filter != EVFILT_READ) 541 continue; 542 sep = (struct servtab *)ev->udata; 543 /* Paranoia */ 544 if ((int)ev->ident != sep->se_fd) 545 continue; 546 if (debug) 547 fprintf(stderr, "someone wants %s\n", 548 sep->se_service); 549 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 550 /* XXX here do the libwrap check-before-accept*/ 551 ctrl = accept(sep->se_fd, NULL, NULL); 552 if (debug) 553 fprintf(stderr, "accept, ctrl %d\n", 554 ctrl); 555 if (ctrl < 0) { 556 if (errno != EINTR) 557 syslog(LOG_WARNING, 558 "accept (for %s): %m", 559 sep->se_service); 560 continue; 561 } 562 } else 563 ctrl = sep->se_fd; 564 spawn(sep, ctrl); 565 } 566 } 567 } 568 569 static void 570 spawn(struct servtab *sep, int ctrl) 571 { 572 int dofork; 573 pid_t pid; 574 575 pid = 0; 576 #ifdef LIBWRAP_INTERNAL 577 dofork = 1; 578 #else 579 dofork = (sep->se_bi == 0 || sep->se_bi->bi_fork); 580 #endif 581 if (dofork) { 582 if (sep->se_count++ == 0) 583 (void)gettimeofday(&sep->se_time, NULL); 584 else if (sep->se_count >= sep->se_max) { 585 struct timeval now; 586 587 (void)gettimeofday(&now, NULL); 588 if (now.tv_sec - sep->se_time.tv_sec > CNT_INTVL) { 589 sep->se_time = now; 590 sep->se_count = 1; 591 } else { 592 syslog(LOG_ERR, 593 "%s/%s max spawn rate (%d in %d seconds) " 594 "exceeded; service not started", 595 sep->se_service, sep->se_proto, 596 sep->se_max, CNT_INTVL); 597 if (!sep->se_wait && sep->se_socktype == 598 SOCK_STREAM) 599 close(ctrl); 600 close_sep(sep); 601 if (!timingout) { 602 timingout = 1; 603 alarm(RETRYTIME); 604 } 605 return; 606 } 607 } 608 pid = fork(); 609 if (pid < 0) { 610 syslog(LOG_ERR, "fork: %m"); 611 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 612 close(ctrl); 613 sleep(1); 614 return; 615 } 616 if (pid != 0 && sep->se_wait) { 617 struct kevent *ev; 618 619 sep->se_wait = pid; 620 ev = allocchange(); 621 EV_SET(ev, sep->se_fd, EVFILT_READ, 622 EV_DELETE, 0, 0, 0); 623 } 624 if (pid == 0) { 625 size_t n; 626 627 for (n = 0; n < A_CNT(my_signals); n++) 628 (void) signal(my_signals[n], SIG_DFL); 629 if (debug) 630 setsid(); 631 } 632 } 633 if (pid == 0) { 634 run_service(ctrl, sep); 635 if (dofork) 636 exit(0); 637 } 638 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 639 close(ctrl); 640 } 641 642 static void 643 run_service(int ctrl, struct servtab *sep) 644 { 645 struct passwd *pwd; 646 struct group *grp = NULL; /* XXX gcc */ 647 char buf[NI_MAXSERV]; 648 #ifdef LIBWRAP 649 struct request_info req; 650 int denied; 651 char *service = NULL; /* XXX gcc */ 652 #endif 653 654 #ifdef LIBWRAP 655 #ifndef LIBWRAP_INTERNAL 656 if (sep->se_bi == 0) 657 #endif 658 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 659 request_init(&req, RQ_DAEMON, sep->se_argv[0] ? 660 sep->se_argv[0] : sep->se_service, RQ_FILE, ctrl, NULL); 661 fromhost(&req); 662 denied = !hosts_access(&req); 663 if (denied || lflag) { 664 if (getnameinfo(&sep->se_ctrladdr, 665 sep->se_ctrladdr.sa_len, NULL, 0, 666 buf, sizeof(buf), 0) != 0) { 667 /* shouldn't happen */ 668 (void)snprintf(buf, sizeof buf, "%d", 669 ntohs(sep->se_ctrladdr_in.sin_port)); 670 } 671 service = buf; 672 } 673 if (denied) { 674 syslog(deny_severity, 675 "refused connection from %.500s, service %s (%s)", 676 eval_client(&req), service, sep->se_proto); 677 goto reject; 678 } 679 if (lflag) { 680 syslog(allow_severity, 681 "connection from %.500s, service %s (%s)", 682 eval_client(&req), service, sep->se_proto); 683 } 684 } 685 #endif /* LIBWRAP */ 686 687 if (sep->se_bi) { 688 (*sep->se_bi->bi_fn)(ctrl, sep); 689 } else { 690 if ((pwd = getpwnam(sep->se_user)) == NULL) { 691 syslog(LOG_ERR, "%s/%s: %s: No such user", 692 sep->se_service, sep->se_proto, sep->se_user); 693 goto reject; 694 } 695 if (sep->se_group && 696 (grp = getgrnam(sep->se_group)) == NULL) { 697 syslog(LOG_ERR, "%s/%s: %s: No such group", 698 sep->se_service, sep->se_proto, sep->se_group); 699 goto reject; 700 } 701 if (pwd->pw_uid) { 702 if (sep->se_group) 703 pwd->pw_gid = grp->gr_gid; 704 if (setgid(pwd->pw_gid) < 0) { 705 syslog(LOG_ERR, 706 "%s/%s: can't set gid %d: %m", sep->se_service, 707 sep->se_proto, pwd->pw_gid); 708 goto reject; 709 } 710 (void) initgroups(pwd->pw_name, 711 pwd->pw_gid); 712 if (setuid(pwd->pw_uid) < 0) { 713 syslog(LOG_ERR, 714 "%s/%s: can't set uid %d: %m", sep->se_service, 715 sep->se_proto, pwd->pw_uid); 716 goto reject; 717 } 718 } else if (sep->se_group) { 719 (void) setgid((gid_t)grp->gr_gid); 720 } 721 if (debug) 722 fprintf(stderr, "%d execl %s\n", 723 getpid(), sep->se_server); 724 #ifdef MULOG 725 if (sep->se_log) 726 dolog(sep, ctrl); 727 #endif 728 /* Set our control descriptor to not close-on-exec... */ 729 if (fcntl(ctrl, F_SETFD, 0) < 0) 730 syslog(LOG_ERR, "fcntl (F_SETFD, 0): %m"); 731 /* ...and dup it to stdin, stdout, and stderr. */ 732 if (ctrl != 0) { 733 dup2(ctrl, 0); 734 close(ctrl); 735 ctrl = 0; 736 } 737 dup2(0, 1); 738 dup2(0, 2); 739 #ifdef RLIMIT_NOFILE 740 if (rlim_ofile.rlim_cur != rlim_ofile_cur && 741 setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) 742 syslog(LOG_ERR, "setrlimit: %m"); 743 #endif 744 execv(sep->se_server, sep->se_argv); 745 syslog(LOG_ERR, "cannot execute %s: %m", sep->se_server); 746 reject: 747 if (sep->se_socktype != SOCK_STREAM) 748 recv(ctrl, buf, sizeof (buf), 0); 749 _exit(1); 750 } 751 } 752 753 static void 754 reapchild(void) 755 { 756 int status; 757 pid_t pid; 758 struct servtab *sep; 759 760 for (;;) { 761 pid = wait3(&status, WNOHANG, NULL); 762 if (pid <= 0) 763 break; 764 if (debug) 765 (void) fprintf(stderr, "%d reaped, status %#x\n", 766 pid, status); 767 for (sep = servtab; sep != NULL; sep = sep->se_next) 768 if (sep->se_wait == pid) { 769 struct kevent *ev; 770 771 if (WIFEXITED(status) && WEXITSTATUS(status)) 772 syslog(LOG_WARNING, 773 "%s: exit status 0x%x", 774 sep->se_server, WEXITSTATUS(status)); 775 else if (WIFSIGNALED(status)) 776 syslog(LOG_WARNING, 777 "%s: exit signal 0x%x", 778 sep->se_server, WTERMSIG(status)); 779 sep->se_wait = 1; 780 ev = allocchange(); 781 EV_SET(ev, sep->se_fd, EVFILT_READ, 782 EV_ADD | EV_ENABLE, 0, 0, (intptr_t)sep); 783 if (debug) 784 fprintf(stderr, "restored %s, fd %d\n", 785 sep->se_service, sep->se_fd); 786 } 787 } 788 } 789 790 static void 791 config(void) 792 { 793 struct servtab *sep, *cp, **sepp; 794 size_t n; 795 796 if (!setconfig()) { 797 syslog(LOG_ERR, "%s: %m", CONFIG); 798 return; 799 } 800 for (sep = servtab; sep != NULL; sep = sep->se_next) 801 sep->se_checked = 0; 802 while ((cp = getconfigent())) { 803 for (sep = servtab; sep != NULL; sep = sep->se_next) 804 if (strcmp(sep->se_service, cp->se_service) == 0 && 805 strcmp(sep->se_hostaddr, cp->se_hostaddr) == 0 && 806 strcmp(sep->se_proto, cp->se_proto) == 0 && 807 ISMUX(sep) == ISMUX(cp)) 808 break; 809 if (sep != NULL) { 810 int i; 811 812 #define SWAP(type, a, b) {type c = a; a = b; b = c;} 813 814 /* 815 * sep->se_wait may be holding the pid of a daemon 816 * that we're waiting for. If so, don't overwrite 817 * it unless the config file explicitly says don't 818 * wait. 819 */ 820 if (cp->se_bi == 0 && 821 (sep->se_wait == 1 || cp->se_wait == 0)) 822 sep->se_wait = cp->se_wait; 823 SWAP(char *, sep->se_user, cp->se_user); 824 SWAP(char *, sep->se_group, cp->se_group); 825 SWAP(char *, sep->se_server, cp->se_server); 826 for (i = 0; i < MAXARGV; i++) 827 SWAP(char *, sep->se_argv[i], cp->se_argv[i]); 828 #ifdef IPSEC 829 SWAP(char *, sep->se_policy, cp->se_policy); 830 #endif 831 SWAP(int, cp->se_type, sep->se_type); 832 SWAP(int, cp->se_max, sep->se_max); 833 #undef SWAP 834 if (isrpcservice(sep)) 835 unregister_rpc(sep); 836 sep->se_rpcversl = cp->se_rpcversl; 837 sep->se_rpcversh = cp->se_rpcversh; 838 freeconfig(cp); 839 if (debug) 840 print_service("REDO", sep); 841 } else { 842 sep = enter(cp); 843 if (debug) 844 print_service("ADD ", sep); 845 } 846 sep->se_checked = 1; 847 848 switch (sep->se_family) { 849 case AF_LOCAL: 850 if (sep->se_fd != -1) 851 break; 852 n = strlen(sep->se_service); 853 if (n > sizeof(sep->se_ctrladdr_un.sun_path)) { 854 syslog(LOG_ERR, "%s: address too long", 855 sep->se_service); 856 sep->se_checked = 0; 857 continue; 858 } 859 (void)unlink(sep->se_service); 860 strncpy(sep->se_ctrladdr_un.sun_path, 861 sep->se_service, n); 862 sep->se_ctrladdr_un.sun_family = AF_LOCAL; 863 sep->se_ctrladdr_size = n + 864 sizeof(sep->se_ctrladdr_un) - 865 sizeof(sep->se_ctrladdr_un.sun_path); 866 if (!ISMUX(sep)) 867 setup(sep); 868 break; 869 case AF_INET: 870 #ifdef INET6 871 case AF_INET6: 872 #endif 873 { 874 struct addrinfo hints, *res; 875 char *host, *port; 876 int error; 877 int s; 878 879 /* check if the family is supported */ 880 s = socket(sep->se_family, SOCK_DGRAM, 0); 881 if (s < 0) { 882 syslog(LOG_WARNING, 883 "%s/%s: %s: the address family is not " 884 "supported by the kernel", 885 sep->se_service, sep->se_proto, 886 sep->se_hostaddr); 887 sep->se_checked = 0; 888 continue; 889 } 890 close(s); 891 892 memset(&hints, 0, sizeof(hints)); 893 hints.ai_family = sep->se_family; 894 hints.ai_socktype = sep->se_socktype; 895 hints.ai_flags = AI_PASSIVE; 896 if (!strcmp(sep->se_hostaddr, "*")) 897 host = NULL; 898 else 899 host = sep->se_hostaddr; 900 if (isrpcservice(sep) || ISMUX(sep)) 901 port = "0"; 902 else 903 port = sep->se_service; 904 error = getaddrinfo(host, port, &hints, &res); 905 if (error) { 906 if (error == EAI_SERVICE) { 907 /* gai_strerror not friendly enough */ 908 syslog(LOG_WARNING, "%s/%s: " 909 "unknown service", 910 sep->se_service, sep->se_proto); 911 } else { 912 syslog(LOG_ERR, "%s/%s: %s: %s", 913 sep->se_service, sep->se_proto, 914 sep->se_hostaddr, 915 gai_strerror(error)); 916 } 917 sep->se_checked = 0; 918 continue; 919 } 920 if (res->ai_next) { 921 syslog(LOG_ERR, 922 "%s/%s: %s: resolved to multiple addr", 923 sep->se_service, sep->se_proto, 924 sep->se_hostaddr); 925 sep->se_checked = 0; 926 freeaddrinfo(res); 927 continue; 928 } 929 memcpy(&sep->se_ctrladdr, res->ai_addr, 930 res->ai_addrlen); 931 if (ISMUX(sep)) { 932 sep->se_fd = -1; 933 freeaddrinfo(res); 934 continue; 935 } 936 sep->se_ctrladdr_size = res->ai_addrlen; 937 freeaddrinfo(res); 938 #ifdef RPC 939 if (isrpcservice(sep)) { 940 struct rpcent *rp; 941 942 sep->se_rpcprog = atoi(sep->se_service); 943 if (sep->se_rpcprog == 0) { 944 rp = getrpcbyname(sep->se_service); 945 if (rp == 0) { 946 syslog(LOG_ERR, 947 "%s/%s: unknown service", 948 sep->se_service, 949 sep->se_proto); 950 sep->se_checked = 0; 951 continue; 952 } 953 sep->se_rpcprog = rp->r_number; 954 } 955 if (sep->se_fd == -1 && !ISMUX(sep)) 956 setup(sep); 957 if (sep->se_fd != -1) 958 register_rpc(sep); 959 } else 960 #endif 961 { 962 if (sep->se_fd >= 0) 963 close_sep(sep); 964 if (sep->se_fd == -1 && !ISMUX(sep)) 965 setup(sep); 966 } 967 } 968 } 969 } 970 endconfig(); 971 /* 972 * Purge anything not looked at above. 973 */ 974 sepp = &servtab; 975 while ((sep = *sepp)) { 976 if (sep->se_checked) { 977 sepp = &sep->se_next; 978 continue; 979 } 980 *sepp = sep->se_next; 981 if (sep->se_fd >= 0) 982 close_sep(sep); 983 if (isrpcservice(sep)) 984 unregister_rpc(sep); 985 if (sep->se_family == AF_LOCAL) 986 (void)unlink(sep->se_service); 987 if (debug) 988 print_service("FREE", sep); 989 freeconfig(sep); 990 free(sep); 991 } 992 } 993 994 static void 995 retry(void) 996 { 997 struct servtab *sep; 998 999 timingout = 0; 1000 for (sep = servtab; sep != NULL; sep = sep->se_next) { 1001 if (sep->se_fd == -1 && !ISMUX(sep)) { 1002 switch (sep->se_family) { 1003 case AF_LOCAL: 1004 case AF_INET: 1005 #ifdef INET6 1006 case AF_INET6: 1007 #endif 1008 setup(sep); 1009 if (sep->se_fd != -1 && isrpcservice(sep)) 1010 register_rpc(sep); 1011 break; 1012 } 1013 } 1014 } 1015 } 1016 1017 static void 1018 goaway(void) 1019 { 1020 struct servtab *sep; 1021 1022 for (sep = servtab; sep != NULL; sep = sep->se_next) { 1023 if (sep->se_fd == -1) 1024 continue; 1025 1026 switch (sep->se_family) { 1027 case AF_LOCAL: 1028 (void)unlink(sep->se_service); 1029 break; 1030 case AF_INET: 1031 #ifdef INET6 1032 case AF_INET6: 1033 #endif 1034 if (sep->se_wait == 1 && isrpcservice(sep)) 1035 unregister_rpc(sep); 1036 break; 1037 } 1038 (void)close(sep->se_fd); 1039 } 1040 exit(0); 1041 } 1042 1043 static void 1044 setup(struct servtab *sep) 1045 { 1046 int on = 1; 1047 #ifdef INET6 1048 int off = 0; 1049 #endif 1050 struct kevent *ev; 1051 1052 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) { 1053 if (debug) 1054 fprintf(stderr, "socket failed on %s/%s: %s\n", 1055 sep->se_service, sep->se_proto, strerror(errno)); 1056 syslog(LOG_ERR, "%s/%s: socket: %m", 1057 sep->se_service, sep->se_proto); 1058 return; 1059 } 1060 /* Set all listening sockets to close-on-exec. */ 1061 if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) { 1062 syslog(LOG_ERR, "%s/%s: fcntl(F_SETFD, FD_CLOEXEC): %m", 1063 sep->se_service, sep->se_proto); 1064 close(sep->se_fd); 1065 return; 1066 } 1067 1068 #define turnon(fd, opt) \ 1069 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 1070 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 1071 turnon(sep->se_fd, SO_DEBUG) < 0) 1072 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 1073 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 1074 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 1075 #undef turnon 1076 1077 /* Set the socket buffer sizes, if specified. */ 1078 if (sep->se_sndbuf != 0 && setsockopt(sep->se_fd, SOL_SOCKET, 1079 SO_SNDBUF, (char *)&sep->se_sndbuf, sizeof(sep->se_sndbuf)) < 0) 1080 syslog(LOG_ERR, "setsockopt (SO_SNDBUF %d): %m", 1081 sep->se_sndbuf); 1082 if (sep->se_rcvbuf != 0 && setsockopt(sep->se_fd, SOL_SOCKET, 1083 SO_RCVBUF, (char *)&sep->se_rcvbuf, sizeof(sep->se_rcvbuf)) < 0) 1084 syslog(LOG_ERR, "setsockopt (SO_RCVBUF %d): %m", 1085 sep->se_rcvbuf); 1086 #ifdef INET6 1087 if (sep->se_family == AF_INET6) { 1088 int *v; 1089 v = (sep->se_type == FAITH_TYPE) ? &on : &off; 1090 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_FAITH, 1091 (char *)v, sizeof(*v)) < 0) 1092 syslog(LOG_ERR, "setsockopt (IPV6_FAITH): %m"); 1093 } 1094 #endif 1095 #ifdef IPSEC 1096 if (ipsecsetup(sep->se_family, sep->se_fd, sep->se_policy) < 0 && 1097 sep->se_policy) { 1098 syslog(LOG_ERR, "%s/%s: ipsec setup failed", 1099 sep->se_service, sep->se_proto); 1100 (void)close(sep->se_fd); 1101 sep->se_fd = -1; 1102 return; 1103 } 1104 #endif 1105 1106 if (bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size) < 0) { 1107 if (debug) 1108 fprintf(stderr, "bind failed on %s/%s: %s\n", 1109 sep->se_service, sep->se_proto, strerror(errno)); 1110 syslog(LOG_ERR, "%s/%s: bind: %m", 1111 sep->se_service, sep->se_proto); 1112 (void) close(sep->se_fd); 1113 sep->se_fd = -1; 1114 if (!timingout) { 1115 timingout = 1; 1116 alarm(RETRYTIME); 1117 } 1118 return; 1119 } 1120 if (sep->se_socktype == SOCK_STREAM) 1121 listen(sep->se_fd, 10); 1122 1123 ev = allocchange(); 1124 EV_SET(ev, sep->se_fd, EVFILT_READ, EV_ADD | EV_ENABLE, 0, 0, 1125 (intptr_t)sep); 1126 if (sep->se_fd > maxsock) { 1127 maxsock = sep->se_fd; 1128 if (maxsock > rlim_ofile_cur - FD_MARGIN) 1129 bump_nofile(); 1130 } 1131 if (debug) 1132 fprintf(stderr, "registered %s on %d\n", 1133 sep->se_server, sep->se_fd); 1134 } 1135 1136 /* 1137 * Finish with a service and its socket. 1138 */ 1139 static void 1140 close_sep(struct servtab *sep) 1141 { 1142 if (sep->se_fd >= 0) { 1143 (void) close(sep->se_fd); 1144 sep->se_fd = -1; 1145 } 1146 sep->se_count = 0; 1147 } 1148 1149 static void 1150 register_rpc(struct servtab *sep) 1151 { 1152 #ifdef RPC 1153 struct netbuf nbuf; 1154 struct sockaddr_storage ss; 1155 struct netconfig *nconf; 1156 socklen_t socklen; 1157 int n; 1158 1159 if ((nconf = getnetconfigent(sep->se_proto+4)) == NULL) { 1160 syslog(LOG_ERR, "%s: getnetconfigent failed", 1161 sep->se_proto); 1162 return; 1163 } 1164 socklen = sizeof ss; 1165 if (getsockname(sep->se_fd, (struct sockaddr *)&ss, &socklen) < 0) { 1166 syslog(LOG_ERR, "%s/%s: getsockname: %m", 1167 sep->se_service, sep->se_proto); 1168 return; 1169 } 1170 1171 nbuf.buf = &ss; 1172 nbuf.len = ss.ss_len; 1173 nbuf.maxlen = sizeof (struct sockaddr_storage); 1174 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1175 if (debug) 1176 fprintf(stderr, "rpcb_set: %u %d %s %s\n", 1177 sep->se_rpcprog, n, nconf->nc_netid, 1178 taddr2uaddr(nconf, &nbuf)); 1179 (void)rpcb_unset(sep->se_rpcprog, n, nconf); 1180 if (!rpcb_set(sep->se_rpcprog, n, nconf, &nbuf)) 1181 syslog(LOG_ERR, "rpcb_set: %u %d %s %s%s", 1182 sep->se_rpcprog, n, nconf->nc_netid, 1183 taddr2uaddr(nconf, &nbuf), clnt_spcreateerror("")); 1184 } 1185 #endif /* RPC */ 1186 } 1187 1188 static void 1189 unregister_rpc(struct servtab *sep) 1190 { 1191 #ifdef RPC 1192 int n; 1193 struct netconfig *nconf; 1194 1195 if ((nconf = getnetconfigent(sep->se_proto+4)) == NULL) { 1196 syslog(LOG_ERR, "%s: getnetconfigent failed", 1197 sep->se_proto); 1198 return; 1199 } 1200 1201 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1202 if (debug) 1203 fprintf(stderr, "rpcb_unset(%u, %d, %s)\n", 1204 sep->se_rpcprog, n, nconf->nc_netid); 1205 if (!rpcb_unset(sep->se_rpcprog, n, nconf)) 1206 syslog(LOG_ERR, "rpcb_unset(%u, %d, %s) failed\n", 1207 sep->se_rpcprog, n, nconf->nc_netid); 1208 } 1209 #endif /* RPC */ 1210 } 1211 1212 1213 static struct servtab * 1214 enter(struct servtab *cp) 1215 { 1216 struct servtab *sep; 1217 1218 sep = (struct servtab *)malloc(sizeof (*sep)); 1219 if (sep == NULL) { 1220 syslog(LOG_ERR, "Out of memory."); 1221 exit(1); 1222 } 1223 *sep = *cp; 1224 sep->se_fd = -1; 1225 sep->se_rpcprog = -1; 1226 sep->se_next = servtab; 1227 servtab = sep; 1228 return (sep); 1229 } 1230 1231 FILE *fconfig = NULL; 1232 struct servtab serv; 1233 char line[LINE_MAX]; 1234 char *defhost; 1235 #ifdef IPSEC 1236 static char *policy = NULL; 1237 #endif 1238 1239 static int 1240 setconfig(void) 1241 { 1242 if (defhost) 1243 free(defhost); 1244 defhost = newstr("*"); 1245 #ifdef IPSEC 1246 if (policy) 1247 free(policy); 1248 policy = NULL; 1249 #endif 1250 if (fconfig != NULL) { 1251 fseek(fconfig, 0L, SEEK_SET); 1252 return (1); 1253 } 1254 fconfig = fopen(CONFIG, "r"); 1255 return (fconfig != NULL); 1256 } 1257 1258 static void 1259 endconfig(void) 1260 { 1261 if (fconfig != NULL) { 1262 (void) fclose(fconfig); 1263 fconfig = NULL; 1264 } 1265 if (defhost != NULL) { 1266 free(defhost); 1267 defhost = NULL; 1268 } 1269 } 1270 1271 static struct servtab * 1272 getconfigent(void) 1273 { 1274 struct servtab *sep = &serv; 1275 int argc, val; 1276 char *cp, *cp0, *arg, *buf0, *buf1, *sz0, *sz1; 1277 static char TCPMUX_TOKEN[] = "tcpmux/"; 1278 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) 1279 char *hostdelim; 1280 1281 more: 1282 while ((cp = nextline(fconfig))) { 1283 #ifdef IPSEC 1284 /* lines starting with #@ is not a comment, but the policy */ 1285 if (cp[0] == '#' && cp[1] == '@') { 1286 char *p; 1287 for (p = cp + 2; p && *p && isspace((unsigned char)*p); p++) 1288 ; 1289 if (*p == '\0') { 1290 if (policy) 1291 free(policy); 1292 policy = NULL; 1293 } else { 1294 if (ipsecsetup_test(p) < 0) { 1295 syslog(LOG_ERR, 1296 "%s: invalid ipsec policy \"%s\"", 1297 CONFIG, p); 1298 exit(1); 1299 } else { 1300 if (policy) 1301 free(policy); 1302 policy = newstr(p); 1303 } 1304 } 1305 } 1306 #endif 1307 if (*cp == '#' || *cp == '\0') 1308 continue; 1309 #ifdef MULOG 1310 /* Avoid use of `skip' if there is a danger of it looking 1311 * at continuation lines. 1312 */ 1313 do { 1314 cp++; 1315 } while (*cp == ' ' || *cp == '\t'); 1316 if (*cp == '\0') 1317 continue; 1318 if ((arg = skip(&cp)) == NULL) 1319 continue; 1320 if (strcmp(arg, "DOMAIN")) 1321 continue; 1322 if (curdom) 1323 free(curdom); 1324 curdom = NULL; 1325 while (*cp == ' ' || *cp == '\t') 1326 cp++; 1327 if (*cp == '\0') 1328 continue; 1329 arg = cp; 1330 while (*cp && *cp != ' ' && *cp != '\t') 1331 cp++; 1332 if (*cp != '\0') 1333 *cp++ = '\0'; 1334 curdom = newstr(arg); 1335 #endif 1336 break; 1337 } 1338 if (cp == NULL) 1339 return (NULL); 1340 /* 1341 * clear the static buffer, since some fields (se_ctrladdr, 1342 * for example) don't get initialized here. 1343 */ 1344 memset((caddr_t)sep, 0, sizeof *sep); 1345 arg = skip(&cp); 1346 if (cp == NULL) { 1347 /* got an empty line containing just blanks/tabs. */ 1348 goto more; 1349 } 1350 /* Check for a host name. */ 1351 hostdelim = strrchr(arg, ':'); 1352 if (hostdelim) { 1353 *hostdelim = '\0'; 1354 if (arg[0] == '[' && hostdelim > arg && hostdelim[-1] == ']') { 1355 hostdelim[-1] = '\0'; 1356 sep->se_hostaddr = newstr(arg + 1); 1357 } else 1358 sep->se_hostaddr = newstr(arg); 1359 arg = hostdelim + 1; 1360 /* 1361 * If the line is of the form `host:', then just change the 1362 * default host for the following lines. 1363 */ 1364 if (*arg == '\0') { 1365 arg = skip(&cp); 1366 if (cp == NULL) { 1367 free(defhost); 1368 defhost = sep->se_hostaddr; 1369 goto more; 1370 } 1371 } 1372 } else 1373 sep->se_hostaddr = newstr(defhost); 1374 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1375 char *c = arg + MUX_LEN; 1376 if (*c == '+') { 1377 sep->se_type = MUXPLUS_TYPE; 1378 c++; 1379 } else 1380 sep->se_type = MUX_TYPE; 1381 sep->se_service = newstr(c); 1382 } else { 1383 sep->se_service = newstr(arg); 1384 sep->se_type = NORM_TYPE; 1385 } 1386 1387 arg = sskip(&cp); 1388 if (strcmp(arg, "stream") == 0) 1389 sep->se_socktype = SOCK_STREAM; 1390 else if (strcmp(arg, "dgram") == 0) 1391 sep->se_socktype = SOCK_DGRAM; 1392 else if (strcmp(arg, "rdm") == 0) 1393 sep->se_socktype = SOCK_RDM; 1394 else if (strcmp(arg, "seqpacket") == 0) 1395 sep->se_socktype = SOCK_SEQPACKET; 1396 else if (strcmp(arg, "raw") == 0) 1397 sep->se_socktype = SOCK_RAW; 1398 else 1399 sep->se_socktype = -1; 1400 1401 arg = sskip(&cp); 1402 if (sep->se_type == NORM_TYPE && 1403 strncmp(arg, "faith/", strlen("faith/")) == 0) { 1404 arg += strlen("faith/"); 1405 sep->se_type = FAITH_TYPE; 1406 } 1407 sep->se_proto = newstr(arg); 1408 1409 #define MALFORMED(arg) \ 1410 do { \ 1411 syslog(LOG_ERR, "%s: malformed buffer size option `%s'", \ 1412 sep->se_service, (arg)); \ 1413 goto more; \ 1414 } while (0) 1415 1416 #define GETVAL(arg) \ 1417 do { \ 1418 if (!isdigit((unsigned char)*(arg))) \ 1419 MALFORMED(arg); \ 1420 val = strtol((arg), &cp0, 10); \ 1421 if (cp0 != NULL) { \ 1422 if (cp0[1] != '\0') \ 1423 MALFORMED((arg)); \ 1424 if (cp0[0] == 'k') \ 1425 val *= 1024; \ 1426 if (cp0[0] == 'm') \ 1427 val *= 1024 * 1024; \ 1428 } \ 1429 if (val < 1) { \ 1430 syslog(LOG_ERR, "%s: invalid buffer size `%s'", \ 1431 sep->se_service, (arg)); \ 1432 goto more; \ 1433 } \ 1434 } while (0) 1435 1436 #define ASSIGN(arg) \ 1437 do { \ 1438 if (strcmp((arg), "sndbuf") == 0) \ 1439 sep->se_sndbuf = val; \ 1440 else if (strcmp((arg), "rcvbuf") == 0) \ 1441 sep->se_rcvbuf = val; \ 1442 else \ 1443 MALFORMED((arg)); \ 1444 } while (0) 1445 1446 /* 1447 * Extract the send and receive buffer sizes before parsing 1448 * the protocol. 1449 */ 1450 sep->se_sndbuf = sep->se_rcvbuf = 0; 1451 buf0 = buf1 = sz0 = sz1 = NULL; 1452 if ((buf0 = strchr(sep->se_proto, ',')) != NULL) { 1453 /* Not meaningful for Tcpmux services. */ 1454 if (ISMUX(sep)) { 1455 syslog(LOG_ERR, "%s: can't specify buffer sizes for " 1456 "tcpmux services", sep->se_service); 1457 goto more; 1458 } 1459 1460 /* Skip the , */ 1461 *buf0++ = '\0'; 1462 1463 /* Check to see if another socket buffer size was specified. */ 1464 if ((buf1 = strchr(buf0, ',')) != NULL) { 1465 /* Skip the , */ 1466 *buf1++ = '\0'; 1467 1468 /* Make sure a 3rd one wasn't specified. */ 1469 if (strchr(buf1, ',') != NULL) { 1470 syslog(LOG_ERR, "%s: too many buffer sizes", 1471 sep->se_service); 1472 goto more; 1473 } 1474 1475 /* Locate the size. */ 1476 if ((sz1 = strchr(buf1, '=')) == NULL) 1477 MALFORMED(buf1); 1478 1479 /* Skip the = */ 1480 *sz1++ = '\0'; 1481 } 1482 1483 /* Locate the size. */ 1484 if ((sz0 = strchr(buf0, '=')) == NULL) 1485 MALFORMED(buf0); 1486 1487 /* Skip the = */ 1488 *sz0++ = '\0'; 1489 1490 GETVAL(sz0); 1491 ASSIGN(buf0); 1492 1493 if (buf1 != NULL) { 1494 GETVAL(sz1); 1495 ASSIGN(buf1); 1496 } 1497 } 1498 1499 #undef ASSIGN 1500 #undef GETVAL 1501 #undef MALFORMED 1502 1503 if (strcmp(sep->se_proto, "unix") == 0) { 1504 sep->se_family = AF_LOCAL; 1505 } else { 1506 val = strlen(sep->se_proto); 1507 if (!val) { 1508 syslog(LOG_ERR, "%s: invalid protocol specified", 1509 sep->se_service); 1510 goto more; 1511 } 1512 val = sep->se_proto[val - 1]; 1513 switch (val) { 1514 case '4': /*tcp4 or udp4*/ 1515 sep->se_family = AF_INET; 1516 break; 1517 #ifdef INET6 1518 case '6': /*tcp6 or udp6*/ 1519 sep->se_family = AF_INET6; 1520 break; 1521 #endif 1522 default: 1523 sep->se_family = AF_INET; /*will become AF_INET6*/ 1524 break; 1525 } 1526 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1527 #ifdef RPC 1528 char *cp, *ccp; 1529 cp = strchr(sep->se_service, '/'); 1530 if (cp == 0) { 1531 syslog(LOG_ERR, "%s: no rpc version", 1532 sep->se_service); 1533 goto more; 1534 } 1535 *cp++ = '\0'; 1536 sep->se_rpcversl = sep->se_rpcversh = 1537 strtol(cp, &ccp, 0); 1538 if (ccp == cp) { 1539 badafterall: 1540 syslog(LOG_ERR, "%s/%s: bad rpc version", 1541 sep->se_service, cp); 1542 goto more; 1543 } 1544 if (*ccp == '-') { 1545 cp = ccp + 1; 1546 sep->se_rpcversh = strtol(cp, &ccp, 0); 1547 if (ccp == cp) 1548 goto badafterall; 1549 } 1550 #else 1551 syslog(LOG_ERR, "%s: rpc services not suported", 1552 sep->se_service); 1553 goto more; 1554 #endif /* RPC */ 1555 } 1556 } 1557 arg = sskip(&cp); 1558 { 1559 char *cp; 1560 if ((cp = strchr(arg, ':')) == NULL) 1561 cp = strchr(arg, '.'); 1562 if (cp != NULL) { 1563 *cp++ = '\0'; 1564 sep->se_max = atoi(cp); 1565 } else 1566 sep->se_max = TOOMANY; 1567 } 1568 sep->se_wait = strcmp(arg, "wait") == 0; 1569 if (ISMUX(sep)) { 1570 /* 1571 * Silently enforce "nowait" for TCPMUX services since 1572 * they don't have an assigned port to listen on. 1573 */ 1574 sep->se_wait = 0; 1575 1576 if (strncmp(sep->se_proto, "tcp", 3)) { 1577 syslog(LOG_ERR, 1578 "%s: bad protocol for tcpmux service %s", 1579 CONFIG, sep->se_service); 1580 goto more; 1581 } 1582 if (sep->se_socktype != SOCK_STREAM) { 1583 syslog(LOG_ERR, 1584 "%s: bad socket type for tcpmux service %s", 1585 CONFIG, sep->se_service); 1586 goto more; 1587 } 1588 } 1589 sep->se_user = newstr(sskip(&cp)); 1590 if ((sep->se_group = strchr(sep->se_user, ':')) != NULL) 1591 *sep->se_group++ = '\0'; 1592 else if ((sep->se_group = strchr(sep->se_user, '.')) != NULL) 1593 *sep->se_group++ = '\0'; 1594 1595 sep->se_server = newstr(sskip(&cp)); 1596 if (strcmp(sep->se_server, "internal") == 0) { 1597 struct biltin *bi; 1598 1599 for (bi = biltins; bi->bi_service; bi++) 1600 if (bi->bi_socktype == sep->se_socktype && 1601 strcmp(bi->bi_service, sep->se_service) == 0) 1602 break; 1603 if (bi->bi_service == 0) { 1604 syslog(LOG_ERR, "internal service %s unknown", 1605 sep->se_service); 1606 goto more; 1607 } 1608 sep->se_bi = bi; 1609 sep->se_wait = bi->bi_wait; 1610 } else 1611 sep->se_bi = NULL; 1612 argc = 0; 1613 for (arg = skip(&cp); cp; arg = skip(&cp)) { 1614 #if MULOG 1615 char *colon; 1616 1617 if (argc == 0 && (colon = strrchr(arg, ':'))) { 1618 while (arg < colon) { 1619 int x; 1620 char *ccp; 1621 1622 switch (*arg++) { 1623 case 'l': 1624 x = 1; 1625 if (isdigit(*arg)) { 1626 x = strtol(arg, &ccp, 0); 1627 if (ccp == arg) 1628 break; 1629 arg = ccp; 1630 } 1631 sep->se_log &= ~MULOG_RFC931; 1632 sep->se_log |= x; 1633 break; 1634 case 'a': 1635 sep->se_log |= MULOG_RFC931; 1636 break; 1637 default: 1638 break; 1639 } 1640 } 1641 arg = colon + 1; 1642 } 1643 #endif 1644 if (argc < MAXARGV) 1645 sep->se_argv[argc++] = newstr(arg); 1646 } 1647 while (argc <= MAXARGV) 1648 sep->se_argv[argc++] = NULL; 1649 #ifdef IPSEC 1650 sep->se_policy = policy ? newstr(policy) : NULL; 1651 #endif 1652 return (sep); 1653 } 1654 1655 static void 1656 freeconfig(struct servtab *cp) 1657 { 1658 int i; 1659 1660 if (cp->se_hostaddr) 1661 free(cp->se_hostaddr); 1662 if (cp->se_service) 1663 free(cp->se_service); 1664 if (cp->se_proto) 1665 free(cp->se_proto); 1666 if (cp->se_user) 1667 free(cp->se_user); 1668 /* Note: se_group is part of the newstr'ed se_user */ 1669 if (cp->se_server) 1670 free(cp->se_server); 1671 for (i = 0; i < MAXARGV; i++) 1672 if (cp->se_argv[i]) 1673 free(cp->se_argv[i]); 1674 #ifdef IPSEC 1675 if (cp->se_policy) 1676 free(cp->se_policy); 1677 #endif 1678 } 1679 1680 1681 /* 1682 * Safe skip - if skip returns null, log a syntax error in the 1683 * configuration file and exit. 1684 */ 1685 static char * 1686 sskip(char **cpp) 1687 { 1688 char *cp; 1689 1690 cp = skip(cpp); 1691 if (cp == NULL) { 1692 syslog(LOG_ERR, "%s: syntax error", CONFIG); 1693 exit(1); 1694 } 1695 return (cp); 1696 } 1697 1698 static char * 1699 skip(char **cpp) 1700 { 1701 char *cp = *cpp; 1702 char *start; 1703 char quote; 1704 1705 if (*cpp == NULL) 1706 return (NULL); 1707 1708 again: 1709 while (*cp == ' ' || *cp == '\t') 1710 cp++; 1711 if (*cp == '\0') { 1712 int c; 1713 1714 c = getc(fconfig); 1715 (void) ungetc(c, fconfig); 1716 if (c == ' ' || c == '\t') 1717 if ((cp = nextline(fconfig))) 1718 goto again; 1719 *cpp = NULL; 1720 return (NULL); 1721 } 1722 start = cp; 1723 quote = '\0'; 1724 while (*cp && (quote || (*cp != ' ' && *cp != '\t'))) { 1725 if (*cp == '\'' || *cp == '"') { 1726 if (quote && *cp != quote) 1727 cp++; 1728 else { 1729 if (quote) 1730 quote = '\0'; 1731 else 1732 quote = *cp; 1733 memmove(cp, cp+1, strlen(cp)); 1734 } 1735 } else 1736 cp++; 1737 } 1738 if (*cp != '\0') 1739 *cp++ = '\0'; 1740 *cpp = cp; 1741 return (start); 1742 } 1743 1744 static char * 1745 nextline(FILE *fd) 1746 { 1747 char *cp; 1748 1749 if (fgets(line, sizeof (line), fd) == NULL) 1750 return (NULL); 1751 cp = strchr(line, '\n'); 1752 if (cp) 1753 *cp = '\0'; 1754 return (line); 1755 } 1756 1757 static char * 1758 newstr(char *cp) 1759 { 1760 if ((cp = strdup((cp != NULL) ? cp : "")) != NULL) 1761 return (cp); 1762 syslog(LOG_ERR, "strdup: %m"); 1763 exit(1); 1764 } 1765 1766 static void 1767 inetd_setproctitle(char *a, int s) 1768 { 1769 socklen_t size; 1770 struct sockaddr_storage ss; 1771 char hbuf[NI_MAXHOST], *hp; 1772 1773 size = sizeof(ss); 1774 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) { 1775 if (getnameinfo((struct sockaddr *)&ss, size, hp = hbuf, 1776 sizeof(hbuf), NULL, 0, niflags) != 0) 1777 hp = "?"; 1778 setproctitle("-%s [%s]", a, hp); 1779 } else 1780 setproctitle("-%s", a); 1781 } 1782 1783 static void 1784 bump_nofile(void) 1785 { 1786 #ifdef RLIMIT_NOFILE 1787 1788 #define FD_CHUNK 32 1789 1790 struct rlimit rl; 1791 1792 if (getrlimit(RLIMIT_NOFILE, &rl) < 0) { 1793 syslog(LOG_ERR, "getrlimit: %m"); 1794 return; 1795 } 1796 rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK); 1797 if (rl.rlim_cur <= rlim_ofile_cur) { 1798 syslog(LOG_ERR, 1799 "bump_nofile: cannot extend file limit, max = %d", 1800 (int)rl.rlim_cur); 1801 return; 1802 } 1803 1804 if (setrlimit(RLIMIT_NOFILE, &rl) < 0) { 1805 syslog(LOG_ERR, "setrlimit: %m"); 1806 return; 1807 } 1808 1809 rlim_ofile_cur = rl.rlim_cur; 1810 return; 1811 1812 #else 1813 syslog(LOG_ERR, "bump_nofile: cannot extend file limit"); 1814 return; 1815 #endif 1816 } 1817 1818 /* 1819 * Internet services provided internally by inetd: 1820 */ 1821 #define BUFSIZE 4096 1822 1823 /* ARGSUSED */ 1824 static void 1825 echo_stream(int s, struct servtab *sep) /* Echo service -- echo data back */ 1826 { 1827 char buffer[BUFSIZE]; 1828 int i; 1829 1830 inetd_setproctitle(sep->se_service, s); 1831 while ((i = read(s, buffer, sizeof(buffer))) > 0 && 1832 write(s, buffer, i) > 0) 1833 ; 1834 } 1835 1836 /* ARGSUSED */ 1837 static void 1838 echo_dg(int s, struct servtab *sep) /* Echo service -- echo data back */ 1839 { 1840 char buffer[BUFSIZE]; 1841 int i; 1842 socklen_t size; 1843 struct sockaddr_storage ss; 1844 struct sockaddr *sa; 1845 1846 sa = (struct sockaddr *)&ss; 1847 size = sizeof(ss); 1848 if ((i = recvfrom(s, buffer, sizeof(buffer), 0, sa, &size)) < 0) 1849 return; 1850 if (port_good_dg(sa)) 1851 (void) sendto(s, buffer, i, 0, sa, size); 1852 } 1853 1854 /* ARGSUSED */ 1855 static void 1856 discard_stream(int s, struct servtab *sep) /* Discard service -- ignore data */ 1857 { 1858 char buffer[BUFSIZE]; 1859 1860 inetd_setproctitle(sep->se_service, s); 1861 while ((errno = 0, read(s, buffer, sizeof(buffer)) > 0) || 1862 errno == EINTR) 1863 ; 1864 } 1865 1866 /* ARGSUSED */ 1867 static void 1868 discard_dg(int s, struct servtab *sep) /* Discard service -- ignore data */ 1869 1870 { 1871 char buffer[BUFSIZE]; 1872 1873 (void) read(s, buffer, sizeof(buffer)); 1874 } 1875 1876 #define LINESIZ 72 1877 char ring[128]; 1878 char *endring; 1879 1880 static void 1881 initring(void) 1882 { 1883 int i; 1884 1885 endring = ring; 1886 1887 for (i = 0; i <= 128; ++i) 1888 if (isprint(i)) 1889 *endring++ = i; 1890 } 1891 1892 /* ARGSUSED */ 1893 static void 1894 chargen_stream(int s,struct servtab *sep) /* Character generator */ 1895 { 1896 int len; 1897 char *rs, text[LINESIZ+2]; 1898 1899 inetd_setproctitle(sep->se_service, s); 1900 1901 if (!endring) { 1902 initring(); 1903 rs = ring; 1904 } 1905 1906 text[LINESIZ] = '\r'; 1907 text[LINESIZ + 1] = '\n'; 1908 for (rs = ring;;) { 1909 if ((len = endring - rs) >= LINESIZ) 1910 memmove(text, rs, LINESIZ); 1911 else { 1912 memmove(text, rs, len); 1913 memmove(text + len, ring, LINESIZ - len); 1914 } 1915 if (++rs == endring) 1916 rs = ring; 1917 if (write(s, text, sizeof(text)) != sizeof(text)) 1918 break; 1919 } 1920 } 1921 1922 /* ARGSUSED */ 1923 static void 1924 chargen_dg(int s, struct servtab *sep) /* Character generator */ 1925 { 1926 struct sockaddr_storage ss; 1927 struct sockaddr *sa; 1928 static char *rs; 1929 int len; 1930 socklen_t size; 1931 char text[LINESIZ+2]; 1932 1933 if (endring == 0) { 1934 initring(); 1935 rs = ring; 1936 } 1937 1938 sa = (struct sockaddr *)&ss; 1939 size = sizeof(ss); 1940 if (recvfrom(s, text, sizeof(text), 0, sa, &size) < 0) 1941 return; 1942 1943 if (!port_good_dg(sa)) 1944 return; 1945 1946 if ((len = endring - rs) >= LINESIZ) 1947 memmove(text, rs, LINESIZ); 1948 else { 1949 memmove(text, rs, len); 1950 memmove(text + len, ring, LINESIZ - len); 1951 } 1952 if (++rs == endring) 1953 rs = ring; 1954 text[LINESIZ] = '\r'; 1955 text[LINESIZ + 1] = '\n'; 1956 (void) sendto(s, text, sizeof(text), 0, sa, size); 1957 } 1958 1959 /* 1960 * Return a machine readable date and time, in the form of the 1961 * number of seconds since midnight, Jan 1, 1900. Since gettimeofday 1962 * returns the number of seconds since midnight, Jan 1, 1970, 1963 * we must add 2208988800 seconds to this figure to make up for 1964 * some seventy years Bell Labs was asleep. 1965 */ 1966 1967 static uint32_t 1968 machtime(void) 1969 { 1970 struct timeval tv; 1971 1972 if (gettimeofday(&tv, NULL) < 0) { 1973 if (debug) 1974 fprintf(stderr, "Unable to get time of day\n"); 1975 return (0); 1976 } 1977 #define OFFSET ((uint32_t)25567 * 24*60*60) 1978 return (htonl((uint32_t)(tv.tv_sec + OFFSET))); 1979 #undef OFFSET 1980 } 1981 1982 /* ARGSUSED */ 1983 static void 1984 machtime_stream(int s, struct servtab *sep) 1985 { 1986 uint32_t result; 1987 1988 result = machtime(); 1989 (void) write(s, (char *) &result, sizeof(result)); 1990 } 1991 1992 /* ARGSUSED */ 1993 void 1994 machtime_dg(int s, struct servtab *sep) 1995 { 1996 uint32_t result; 1997 struct sockaddr_storage ss; 1998 struct sockaddr *sa; 1999 socklen_t size; 2000 2001 sa = (struct sockaddr *)&ss; 2002 size = sizeof(ss); 2003 if (recvfrom(s, (char *)&result, sizeof(result), 0, sa, &size) < 0) 2004 return; 2005 if (!port_good_dg(sa)) 2006 return; 2007 result = machtime(); 2008 (void) sendto(s, (char *) &result, sizeof(result), 0, sa, size); 2009 } 2010 2011 /* ARGSUSED */ 2012 static void 2013 daytime_stream(int s,struct servtab *sep) 2014 /* Return human-readable time of day */ 2015 { 2016 char buffer[256]; 2017 time_t clock; 2018 int len; 2019 2020 clock = time((time_t *) 0); 2021 2022 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 2023 (void) write(s, buffer, len); 2024 } 2025 2026 /* ARGSUSED */ 2027 void 2028 daytime_dg(int s, struct servtab *sep) 2029 /* Return human-readable time of day */ 2030 { 2031 char buffer[256]; 2032 time_t clock; 2033 struct sockaddr_storage ss; 2034 struct sockaddr *sa; 2035 socklen_t size; 2036 int len; 2037 2038 clock = time((time_t *) 0); 2039 2040 sa = (struct sockaddr *)&ss; 2041 size = sizeof(ss); 2042 if (recvfrom(s, buffer, sizeof(buffer), 0, sa, &size) < 0) 2043 return; 2044 if (!port_good_dg(sa)) 2045 return; 2046 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 2047 (void) sendto(s, buffer, len, 0, sa, size); 2048 } 2049 2050 /* 2051 * print_service: 2052 * Dump relevant information to stderr 2053 */ 2054 static void 2055 print_service(char *action, struct servtab *sep) 2056 { 2057 2058 if (isrpcservice(sep)) 2059 fprintf(stderr, 2060 "%s: %s rpcprog=%d, rpcvers = %d/%d, proto=%s, wait.max=%d.%d, user:group=%s:%s builtin=%lx server=%s" 2061 #ifdef IPSEC 2062 " policy=\"%s\"" 2063 #endif 2064 "\n", 2065 action, sep->se_service, 2066 sep->se_rpcprog, sep->se_rpcversh, sep->se_rpcversl, sep->se_proto, 2067 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 2068 (long)sep->se_bi, sep->se_server 2069 #ifdef IPSEC 2070 , (sep->se_policy ? sep->se_policy : "") 2071 #endif 2072 ); 2073 else 2074 fprintf(stderr, 2075 "%s: %s proto=%s%s, wait.max=%d.%d, user:group=%s:%s builtin=%lx server=%s" 2076 #ifdef IPSEC 2077 " policy=%s" 2078 #endif 2079 "\n", 2080 action, sep->se_service, 2081 sep->se_type == FAITH_TYPE ? "faith/" : "", 2082 sep->se_proto, 2083 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 2084 (long)sep->se_bi, sep->se_server 2085 #ifdef IPSEC 2086 , (sep->se_policy ? sep->se_policy : "") 2087 #endif 2088 ); 2089 } 2090 2091 static void 2092 usage(void) 2093 { 2094 #ifdef LIBWRAP 2095 (void)fprintf(stderr, "usage: %s [-dl] [conf]\n", getprogname()); 2096 #else 2097 (void)fprintf(stderr, "usage: %s [-d] [conf]\n", getprogname()); 2098 #endif 2099 exit(1); 2100 } 2101 2102 2103 /* 2104 * Based on TCPMUX.C by Mark K. Lottor November 1988 2105 * sri-nic::ps:<mkl>tcpmux.c 2106 */ 2107 2108 static int /* # of characters upto \r,\n or \0 */ 2109 getline(int fd, char *buf, int len) 2110 { 2111 int count = 0, n; 2112 2113 do { 2114 n = read(fd, buf, len-count); 2115 if (n == 0) 2116 return (count); 2117 if (n < 0) 2118 return (-1); 2119 while (--n >= 0) { 2120 if (*buf == '\r' || *buf == '\n' || *buf == '\0') 2121 return (count); 2122 count++; 2123 buf++; 2124 } 2125 } while (count < len); 2126 return (count); 2127 } 2128 2129 #define MAX_SERV_LEN (256+2) /* 2 bytes for \r\n */ 2130 2131 #define strwrite(fd, buf) (void) write(fd, buf, sizeof(buf)-1) 2132 2133 static void 2134 tcpmux(int ctrl, struct servtab *sep) 2135 { 2136 char service[MAX_SERV_LEN+1]; 2137 int len; 2138 2139 /* Get requested service name */ 2140 if ((len = getline(ctrl, service, MAX_SERV_LEN)) < 0) { 2141 strwrite(ctrl, "-Error reading service name\r\n"); 2142 goto reject; 2143 } 2144 service[len] = '\0'; 2145 2146 if (debug) 2147 fprintf(stderr, "tcpmux: someone wants %s\n", service); 2148 2149 /* 2150 * Help is a required command, and lists available services, 2151 * one per line. 2152 */ 2153 if (!strcasecmp(service, "help")) { 2154 strwrite(ctrl, "+Available services:\r\n"); 2155 strwrite(ctrl, "help\r\n"); 2156 for (sep = servtab; sep != NULL; sep = sep->se_next) { 2157 if (!ISMUX(sep)) 2158 continue; 2159 (void)write(ctrl, sep->se_service, 2160 strlen(sep->se_service)); 2161 strwrite(ctrl, "\r\n"); 2162 } 2163 goto reject; 2164 } 2165 2166 /* Try matching a service in inetd.conf with the request */ 2167 for (sep = servtab; sep != NULL; sep = sep->se_next) { 2168 if (!ISMUX(sep)) 2169 continue; 2170 if (!strcasecmp(service, sep->se_service)) { 2171 if (ISMUXPLUS(sep)) 2172 strwrite(ctrl, "+Go\r\n"); 2173 run_service(ctrl, sep); 2174 return; 2175 } 2176 } 2177 strwrite(ctrl, "-Service not available\r\n"); 2178 reject: 2179 _exit(1); 2180 } 2181 2182 #ifdef MULOG 2183 void 2184 dolog(struct servtab *sep, int ctrl) 2185 { 2186 struct sockaddr_storage ss; 2187 struct sockaddr *sa = (struct sockaddr *)&ss; 2188 socklen_t len = sizeof(ss); 2189 char *host, *dp, buf[BUFSIZ]; 2190 int connected = 1; 2191 2192 switch (sep->se_family) { 2193 case AF_INET: 2194 #ifdef INET6 2195 case AF_INET6: 2196 #endif 2197 break; 2198 default: 2199 return; 2200 } 2201 2202 if (getpeername(ctrl, sa, &len) < 0) { 2203 if (errno != ENOTCONN) { 2204 syslog(LOG_ERR, "getpeername: %m"); 2205 return; 2206 } 2207 if (recvfrom(ctrl, buf, sizeof(buf), MSG_PEEK, sa, &len) < 0) { 2208 syslog(LOG_ERR, "recvfrom: %m"); 2209 return; 2210 } 2211 connected = 0; 2212 } 2213 switch (sa->sa_family) { 2214 case AF_INET: 2215 #ifdef INET6 2216 case AF_INET6: 2217 #endif 2218 break; 2219 default: 2220 syslog(LOG_ERR, "unexpected address family %u", sa->sa_family); 2221 return; 2222 } 2223 2224 if (getnameinfo(sa, len, buf, sizeof(buf), NULL, 0, 0) != 0) 2225 strlcpy(buf, "?", sizeof(buf)); 2226 host = buf; 2227 2228 switch (sep->se_log & ~MULOG_RFC931) { 2229 case 0: 2230 return; 2231 case 1: 2232 if (curdom == NULL || *curdom == '\0') 2233 break; 2234 dp = host + strlen(host) - strlen(curdom); 2235 if (dp < host) 2236 break; 2237 if (debug) 2238 fprintf(stderr, "check \"%s\" against curdom \"%s\"\n", 2239 host, curdom); 2240 if (strcasecmp(dp, curdom) == 0) 2241 return; 2242 break; 2243 case 2: 2244 default: 2245 break; 2246 } 2247 2248 openlog("", LOG_NOWAIT, MULOG); 2249 2250 if (connected && (sep->se_log & MULOG_RFC931)) 2251 syslog(LOG_INFO, "%s@%s wants %s", 2252 rfc931_name(sa, ctrl), host, sep->se_service); 2253 else 2254 syslog(LOG_INFO, "%s wants %s", 2255 host, sep->se_service); 2256 } 2257 2258 /* 2259 * From tcp_log by 2260 * Wietse Venema, Eindhoven University of Technology, The Netherlands. 2261 */ 2262 #if 0 2263 static char sccsid[] = "@(#) rfc931.c 1.3 92/08/31 22:54:46"; 2264 #endif 2265 2266 #include <setjmp.h> 2267 2268 #define RFC931_PORT 113 /* Semi-well-known port */ 2269 #define TIMEOUT 4 2270 #define TIMEOUT2 10 2271 2272 static jmp_buf timebuf; 2273 2274 /* timeout - handle timeouts */ 2275 2276 static void 2277 timeout(int sig) 2278 { 2279 longjmp(timebuf, sig); 2280 } 2281 2282 /* rfc931_name - return remote user name */ 2283 2284 char * 2285 rfc931_name(struct sockaddr *there, /* remote link information */ 2286 int ctrl) 2287 { 2288 struct sockaddr_storage here; /* local link information */ 2289 struct sockaddr_storage sin; /* for talking to RFC931 daemon */ 2290 socklen_t length; 2291 int s; 2292 unsigned remote; 2293 unsigned local; 2294 static char user[256]; /* XXX */ 2295 char buf[256]; 2296 char *cp; 2297 char *result = "USER_UNKNOWN"; 2298 int len; 2299 u_int16_t myport, hisport; 2300 2301 /* Find out local port number of our stdin. */ 2302 2303 length = sizeof(here); 2304 if (getsockname(ctrl, (struct sockaddr *) &here, &length) == -1) { 2305 syslog(LOG_ERR, "getsockname: %m"); 2306 return (result); 2307 } 2308 switch (here.ss_family) { 2309 case AF_INET: 2310 myport = ((struct sockaddr_in *)&here)->sin_port; 2311 break; 2312 #ifdef INET6 2313 case AF_INET6: 2314 myport = ((struct sockaddr_in6 *)&here)->sin6_port; 2315 break; 2316 #endif 2317 } 2318 switch (there->sa_family) { 2319 case AF_INET: 2320 hisport = ((struct sockaddr_in *)&there)->sin_port; 2321 break; 2322 #ifdef INET6 2323 case AF_INET6: 2324 hisport = ((struct sockaddr_in6 *)&there)->sin6_port; 2325 break; 2326 #endif 2327 } 2328 /* Set up timer so we won't get stuck. */ 2329 2330 if ((s = socket(here.ss_family, SOCK_STREAM, 0)) == -1) { 2331 syslog(LOG_ERR, "socket: %m"); 2332 return (result); 2333 } 2334 2335 sin = here; 2336 switch (sin.ss_family) { 2337 case AF_INET: 2338 ((struct sockaddr_in *)&sin)->sin_port = htons(0); 2339 break; 2340 #ifdef INET6 2341 case AF_INET6: 2342 ((struct sockaddr_in6 *)&sin)->sin6_port = htons(0); 2343 break; 2344 #endif 2345 } 2346 if (bind(s, (struct sockaddr *) &sin, sin.ss_len) == -1) { 2347 syslog(LOG_ERR, "bind: %m"); 2348 return (result); 2349 } 2350 2351 signal(SIGALRM, timeout); 2352 if (setjmp(timebuf)) { 2353 close(s); /* not: fclose(fp) */ 2354 return (result); 2355 } 2356 alarm(TIMEOUT); 2357 2358 /* Connect to the RFC931 daemon. */ 2359 2360 memcpy(&sin, there, there->sa_len); 2361 switch (sin.ss_family) { 2362 case AF_INET: 2363 ((struct sockaddr_in *)&sin)->sin_port = htons(RFC931_PORT); 2364 break; 2365 #ifdef INET6 2366 case AF_INET6: 2367 ((struct sockaddr_in6 *)&sin)->sin6_port = htons(RFC931_PORT); 2368 break; 2369 #endif 2370 } 2371 if (connect(s, (struct sockaddr *) &sin, sin.ss_len) == -1) { 2372 close(s); 2373 alarm(0); 2374 return (result); 2375 } 2376 2377 /* Query the RFC 931 server. Would 13-byte writes ever be broken up? */ 2378 (void)snprintf(buf, sizeof buf, "%u,%u\r\n", ntohs(hisport), 2379 ntohs(myport)); 2380 2381 for (len = 0, cp = buf; len < strlen(buf); ) { 2382 int n; 2383 2384 if ((n = write(s, cp, strlen(buf) - len)) == -1) { 2385 close(s); 2386 alarm(0); 2387 return (result); 2388 } 2389 cp += n; 2390 len += n; 2391 } 2392 2393 /* Read response */ 2394 for (cp = buf; cp < buf + sizeof(buf) - 1; ) { 2395 char c; 2396 if (read(s, &c, 1) != 1) { 2397 close(s); 2398 alarm(0); 2399 return (result); 2400 } 2401 if (c == '\n') 2402 break; 2403 *cp++ = c; 2404 } 2405 *cp = '\0'; 2406 2407 if (sscanf(buf, "%u , %u : USERID :%*[^:]:%255s", &remote, &local, 2408 user) == 3 && ntohs(hisport) == remote && ntohs(myport) == local) { 2409 /* Strip trailing carriage return. */ 2410 if ((cp = strchr(user, '\r')) != NULL) 2411 *cp = 0; 2412 result = user; 2413 } 2414 2415 alarm(0); 2416 close(s); 2417 return (result); 2418 } 2419 #endif 2420 2421 /* 2422 * check if the address/port where send data to is one of the obvious ports 2423 * that are used for denial of service attacks like two echo ports 2424 * just echoing data between them 2425 */ 2426 static int 2427 port_good_dg(struct sockaddr *sa) 2428 { 2429 struct in_addr in; 2430 #ifdef INET6 2431 struct in6_addr *in6; 2432 #endif 2433 u_int16_t port; 2434 int i, bad; 2435 char hbuf[NI_MAXHOST]; 2436 2437 bad = 0; 2438 2439 switch (sa->sa_family) { 2440 case AF_INET: 2441 in.s_addr = ntohl(((struct sockaddr_in *)sa)->sin_addr.s_addr); 2442 port = ntohs(((struct sockaddr_in *)sa)->sin_port); 2443 #ifdef INET6 2444 v4chk: 2445 #endif 2446 if (IN_MULTICAST(in.s_addr)) 2447 goto bad; 2448 switch ((in.s_addr & 0xff000000) >> 24) { 2449 case 0: case 127: case 255: 2450 goto bad; 2451 } 2452 if (dg_broadcast(&in)) 2453 goto bad; 2454 break; 2455 #ifdef INET6 2456 case AF_INET6: 2457 in6 = &((struct sockaddr_in6 *)sa)->sin6_addr; 2458 port = ntohs(((struct sockaddr_in6 *)sa)->sin6_port); 2459 if (IN6_IS_ADDR_MULTICAST(in6) || IN6_IS_ADDR_UNSPECIFIED(in6)) 2460 goto bad; 2461 if (IN6_IS_ADDR_V4MAPPED(in6) || IN6_IS_ADDR_V4COMPAT(in6)) { 2462 memcpy(&in, &in6->s6_addr[12], sizeof(in)); 2463 in.s_addr = ntohl(in.s_addr); 2464 goto v4chk; 2465 } 2466 break; 2467 #endif 2468 default: 2469 /* XXX unsupported af, is it safe to assume it to be safe? */ 2470 return (1); 2471 } 2472 2473 for (i = 0; bad_ports[i] != 0; i++) { 2474 if (port == bad_ports[i]) 2475 goto bad; 2476 } 2477 2478 return (1); 2479 2480 bad: 2481 if (getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), NULL, 0, 2482 niflags) != 0) 2483 strlcpy(hbuf, "?", sizeof(hbuf)); 2484 syslog(LOG_WARNING,"Possible DoS attack from %s, Port %d", 2485 hbuf, port); 2486 return (0); 2487 } 2488 2489 /* XXX need optimization */ 2490 static int 2491 dg_broadcast(struct in_addr *in) 2492 { 2493 struct ifaddrs *ifa, *ifap; 2494 struct sockaddr_in *sin; 2495 2496 if (getifaddrs(&ifap) < 0) 2497 return (0); 2498 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 2499 if (ifa->ifa_addr->sa_family != AF_INET || 2500 (ifa->ifa_flags & IFF_BROADCAST) == 0) 2501 continue; 2502 sin = (struct sockaddr_in *)ifa->ifa_broadaddr; 2503 if (sin->sin_addr.s_addr == in->s_addr) { 2504 freeifaddrs(ifap); 2505 return (1); 2506 } 2507 } 2508 freeifaddrs(ifap); 2509 return (0); 2510 } 2511 2512 static int 2513 my_kevent(const struct kevent *changelist, size_t nchanges, 2514 struct kevent *eventlist, size_t nevents) 2515 { 2516 int result; 2517 2518 while ((result = kevent(kq, changelist, nchanges, eventlist, nevents, 2519 NULL)) < 0) 2520 if (errno != EINTR) { 2521 syslog(LOG_ERR, "kevent: %m"); 2522 exit(EXIT_FAILURE); 2523 } 2524 2525 return (result); 2526 } 2527 2528 static struct kevent * 2529 allocchange(void) 2530 { 2531 if (changes == A_CNT(changebuf)) { 2532 (void) my_kevent(changebuf, A_CNT(changebuf), NULL, 0); 2533 changes = 0; 2534 } 2535 2536 return (&changebuf[changes++]); 2537 } 2538
Indexes created Sat Oct 18 08:10:09 GMT 2025