inetd.c revision 1.93
1 /* $NetBSD: inetd.c,v 1.93 2003/08/07 11:25:21 agc 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 1.93 2003/08/07 11:25:21 agc Exp $"); 77 #endif 78 #endif /* not lint */ 79 80 /* 81 * Inetd - Internet super-server 82 * 83 * This program invokes all internet services as needed. Connection-oriented 84 * services are invoked each time a connection is made, by creating a process. 85 * This process is passed the connection as file descriptor 0 and is expected 86 * to do a getpeername to find out the source host and port. 87 * 88 * Datagram oriented services are invoked when a datagram 89 * arrives; a process is created and passed a pending message 90 * on file descriptor 0. Datagram servers may either connect 91 * to their peer, freeing up the original socket for inetd 92 * to receive further messages on, or ``take over the socket'', 93 * processing all arriving datagrams and, eventually, timing 94 * out. The first type of server is said to be ``multi-threaded''; 95 * the second type of server ``single-threaded''. 96 * 97 * Inetd uses a configuration file which is read at startup 98 * and, possibly, at some later time in response to a hangup signal. 99 * The configuration file is ``free format'' with fields given in the 100 * order shown below. Continuation lines for an entry must being with 101 * a space or tab. All fields must be present in each entry. 102 * 103 * service name must be in /etc/services or must 104 * name a tcpmux service 105 * socket type stream/dgram/raw/rdm/seqpacket 106 * protocol must be in /etc/protocols 107 * wait/nowait[:max] single-threaded/multi-threaded, max # 108 * user[:group] user/group to run daemon as 109 * server program full path name 110 * server program arguments maximum of MAXARGS (20) 111 * 112 * For RPC services 113 * service name/version must be in /etc/rpc 114 * socket type stream/dgram/raw/rdm/seqpacket 115 * protocol must be in /etc/protocols 116 * wait/nowait[:max] single-threaded/multi-threaded 117 * user[:group] user to run daemon as 118 * server program full path name 119 * server program arguments maximum of MAXARGS (20) 120 * 121 * For non-RPC services, the "service name" can be of the form 122 * hostaddress:servicename, in which case the hostaddress is used 123 * as the host portion of the address to listen on. If hostaddress 124 * consists of a single `*' character, INADDR_ANY is used. 125 * 126 * A line can also consist of just 127 * hostaddress: 128 * where hostaddress is as in the preceding paragraph. Such a line must 129 * have no further fields; the specified hostaddress is remembered and 130 * used for all further lines that have no hostaddress specified, 131 * until the next such line (or EOF). (This is why * is provided to 132 * allow explicit specification of INADDR_ANY.) A line 133 * *: 134 * is implicitly in effect at the beginning of the file. 135 * 136 * The hostaddress specifier may (and often will) contain dots; 137 * the service name must not. 138 * 139 * For RPC services, host-address specifiers are accepted and will 140 * work to some extent; however, because of limitations in the 141 * portmapper interface, it will not work to try to give more than 142 * one line for any given RPC service, even if the host-address 143 * specifiers are different. 144 * 145 * TCP services without official port numbers are handled with the 146 * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for 147 * requests. When a connection is made from a foreign host, the service 148 * requested is passed to tcpmux, which looks it up in the servtab list 149 * and returns the proper entry for the service. Tcpmux returns a 150 * negative reply if the service doesn't exist, otherwise the invoked 151 * server is expected to return the positive reply if the service type in 152 * inetd.conf file has the prefix "tcpmux/". If the service type has the 153 * prefix "tcpmux/+", tcpmux will return the positive reply for the 154 * process; this is for compatibility with older server code, and also 155 * allows you to invoke programs that use stdin/stdout without putting any 156 * special server code in them. Services that use tcpmux are "nowait" 157 * because they do not have a well-known port and hence cannot listen 158 * for new requests. 159 * 160 * Comment lines are indicated by a `#' in column 1. 161 * 162 * #ifdef IPSEC 163 * Comment lines that start with "#@" denote IPsec policy string, as described 164 * in ipsec_set_policy(3). This will affect all the following items in 165 * inetd.conf(8). To reset the policy, just use "#@" line. By default, 166 * there's no IPsec policy. 167 * #endif 168 */ 169 170 /* 171 * Here's the scoop concerning the user:group feature: 172 * 173 * 1) set-group-option off. 174 * 175 * a) user = root: NO setuid() or setgid() is done 176 * 177 * b) other: setuid() 178 * setgid(primary group as found in passwd) 179 * initgroups(name, primary group) 180 * 181 * 2) set-group-option on. 182 * 183 * a) user = root: NO setuid() 184 * setgid(specified group) 185 * NO initgroups() 186 * 187 * b) other: setuid() 188 * setgid(specified group) 189 * initgroups(name, specified group) 190 * 191 */ 192 193 #include <sys/param.h> 194 #include <sys/stat.h> 195 #include <sys/ioctl.h> 196 #include <sys/socket.h> 197 #include <sys/un.h> 198 #include <sys/wait.h> 199 #include <sys/time.h> 200 #include <sys/resource.h> 201 #include <sys/event.h> 202 203 #ifndef RLIMIT_NOFILE 204 #define RLIMIT_NOFILE RLIMIT_OFILE 205 #endif 206 207 #ifndef NO_RPC 208 #define RPC 209 #endif 210 211 #include <net/if.h> 212 213 #include <netinet/in.h> 214 #include <arpa/inet.h> 215 #ifdef RPC 216 #include <rpc/rpc.h> 217 #include <rpc/rpcb_clnt.h> 218 #include <netconfig.h> 219 #endif 220 221 #include <ctype.h> 222 #include <errno.h> 223 #include <fcntl.h> 224 #include <grp.h> 225 #include <netdb.h> 226 #include <pwd.h> 227 #include <signal.h> 228 #include <stdio.h> 229 #include <stdlib.h> 230 #include <string.h> 231 #include <syslog.h> 232 #include <unistd.h> 233 #include <util.h> 234 #include <ifaddrs.h> 235 236 #include "pathnames.h" 237 238 #ifdef IPSEC 239 #include <netinet6/ipsec.h> 240 #ifndef IPSEC_POLICY_IPSEC /* no ipsec support on old ipsec */ 241 #undef IPSEC 242 #endif 243 #include "ipsec.h" 244 #endif 245 246 #ifdef LIBWRAP 247 # include <tcpd.h> 248 #ifndef LIBWRAP_ALLOW_FACILITY 249 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH 250 #endif 251 #ifndef LIBWRAP_ALLOW_SEVERITY 252 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO 253 #endif 254 #ifndef LIBWRAP_DENY_FACILITY 255 # define LIBWRAP_DENY_FACILITY LOG_AUTH 256 #endif 257 #ifndef LIBWRAP_DENY_SEVERITY 258 # define LIBWRAP_DENY_SEVERITY LOG_WARNING 259 #endif 260 int allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY; 261 int deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY; 262 #endif 263 264 #define TOOMANY 40 /* don't start more than TOOMANY */ 265 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */ 266 #define RETRYTIME (60*10) /* retry after bind or server fail */ 267 268 #define A_CNT(a) (sizeof (a) / sizeof (a[0])) 269 270 int debug; 271 #ifdef LIBWRAP 272 int lflag; 273 #endif 274 int maxsock; 275 int kq; 276 int options; 277 int timingout; 278 struct servent *sp; 279 char *curdom; 280 const int niflags = NI_NUMERICHOST | NI_NUMERICSERV; 281 282 #ifndef OPEN_MAX 283 #define OPEN_MAX 64 284 #endif 285 286 /* Reserve some descriptors, 3 stdio + at least: 1 log, 1 conf. file */ 287 #define FD_MARGIN (8) 288 rlim_t rlim_ofile_cur = OPEN_MAX; 289 290 #ifdef RLIMIT_NOFILE 291 struct rlimit rlim_ofile; 292 #endif 293 294 struct kevent changebuf[64]; 295 size_t changes; 296 297 struct servtab { 298 char *se_hostaddr; /* host address to listen on */ 299 char *se_service; /* name of service */ 300 int se_socktype; /* type of socket to use */ 301 int se_family; /* address family */ 302 char *se_proto; /* protocol used */ 303 int se_sndbuf; /* sndbuf size */ 304 int se_rcvbuf; /* rcvbuf size */ 305 int se_rpcprog; /* rpc program number */ 306 int se_rpcversl; /* rpc program lowest version */ 307 int se_rpcversh; /* rpc program highest version */ 308 #define isrpcservice(sep) ((sep)->se_rpcversl != 0) 309 pid_t se_wait; /* single threaded server */ 310 short se_checked; /* looked at during merge */ 311 char *se_user; /* user name to run as */ 312 char *se_group; /* group name to run as */ 313 struct biltin *se_bi; /* if built-in, description */ 314 char *se_server; /* server program */ 315 #define MAXARGV 20 316 char *se_argv[MAXARGV+1]; /* program arguments */ 317 #ifdef IPSEC 318 char *se_policy; /* IPsec poilcy string */ 319 #endif 320 int se_fd; /* open descriptor */ 321 int se_type; /* type */ 322 union { 323 struct sockaddr se_un_ctrladdr; 324 struct sockaddr_in se_un_ctrladdr_in; 325 struct sockaddr_in6 se_un_ctrladdr_in6; 326 struct sockaddr_un se_un_ctrladdr_un; 327 } se_un; /* bound address */ 328 #define se_ctrladdr se_un.se_un_ctrladdr 329 #define se_ctrladdr_in se_un.se_un_ctrladdr_in 330 #define se_ctrladdr_un se_un.se_un_ctrladdr_un 331 int se_ctrladdr_size; 332 int se_max; /* max # of instances of this service */ 333 int se_count; /* number started since se_time */ 334 struct timeval se_time; /* start of se_count */ 335 #ifdef MULOG 336 int se_log; 337 #define MULOG_RFC931 0x40000000 338 #endif 339 struct servtab *se_next; 340 } *servtab; 341 342 #define NORM_TYPE 0 343 #define MUX_TYPE 1 344 #define MUXPLUS_TYPE 2 345 #define FAITH_TYPE 3 346 #define ISMUX(sep) (((sep)->se_type == MUX_TYPE) || \ 347 ((sep)->se_type == MUXPLUS_TYPE)) 348 #define ISMUXPLUS(sep) ((sep)->se_type == MUXPLUS_TYPE) 349 350 351 static void chargen_dg(int, struct servtab *); 352 static void chargen_stream(int, struct servtab *); 353 static void close_sep(struct servtab *); 354 static void config(void); 355 static void daytime_dg(int, struct servtab *); 356 static void daytime_stream(int, struct servtab *); 357 static void discard_dg(int, struct servtab *); 358 static void discard_stream(int, struct servtab *); 359 static void echo_dg(int, struct servtab *); 360 static void echo_stream(int, struct servtab *); 361 static void endconfig(void); 362 static struct servtab *enter(struct servtab *); 363 static void freeconfig(struct servtab *); 364 static struct servtab *getconfigent(void); 365 static void goaway(void); 366 static void machtime_dg(int, struct servtab *); 367 static void machtime_stream(int, struct servtab *); 368 static char *newstr(char *); 369 static char *nextline(FILE *); 370 static void print_service(char *, struct servtab *); 371 static void reapchild(void); 372 static void retry(void); 373 static void run_service(int, struct servtab *); 374 static int setconfig(void); 375 static void setup(struct servtab *); 376 static char *sskip(char **); 377 static char *skip(char **); 378 static void tcpmux(int, struct servtab *); 379 static void usage(void); 380 static void register_rpc(struct servtab *); 381 static void unregister_rpc(struct servtab *); 382 static void bump_nofile(void); 383 static void inetd_setproctitle(char *, int); 384 static void initring(void); 385 static uint32_t machtime(void); 386 static int port_good_dg(struct sockaddr *); 387 static int dg_broadcast(struct in_addr *); 388 static int my_kevent(const struct kevent *, size_t, struct kevent *, 389 size_t); 390 static struct kevent * allocchange(void); 391 static int getline(int, char *, int); 392 static void spawn(struct servtab *, int); 393 #ifdef MULOG 394 static void dolog(struct servtab *, int); 395 static void timeout(int); 396 static char *rfc931_name(struct sockaddr *, int); 397 #endif 398 399 struct biltin { 400 char *bi_service; /* internally provided service name */ 401 int bi_socktype; /* type of socket supported */ 402 short bi_fork; /* 1 if should fork before call */ 403 short bi_wait; /* 1 if should wait for child */ 404 void (*bi_fn)(int, struct servtab *); 405 /* function which performs it */ 406 } biltins[] = { 407 /* Echo received data */ 408 { "echo", SOCK_STREAM, 1, 0, echo_stream }, 409 { "echo", SOCK_DGRAM, 0, 0, echo_dg }, 410 411 /* Internet /dev/null */ 412 { "discard", SOCK_STREAM, 1, 0, discard_stream }, 413 { "discard", SOCK_DGRAM, 0, 0, discard_dg }, 414 415 /* Return 32 bit time since 1970 */ 416 { "time", SOCK_STREAM, 0, 0, machtime_stream }, 417 { "time", SOCK_DGRAM, 0, 0, machtime_dg }, 418 419 /* Return human-readable time */ 420 { "daytime", SOCK_STREAM, 0, 0, daytime_stream }, 421 { "daytime", SOCK_DGRAM, 0, 0, daytime_dg }, 422 423 /* Familiar character generator */ 424 { "chargen", SOCK_STREAM, 1, 0, chargen_stream }, 425 { "chargen", SOCK_DGRAM, 0, 0, chargen_dg }, 426 427 { "tcpmux", SOCK_STREAM, 1, 0, tcpmux }, 428 429 { NULL } 430 }; 431 432 /* list of "bad" ports. I.e. ports that are most obviously used for 433 * "cycling packets" denial of service attacks. See /etc/services. 434 * List must end with port number "0". 435 */ 436 437 u_int16_t bad_ports[] = { 7, 9, 13, 19, 37, 0 }; 438 439 440 #define NUMINT (sizeof(intab) / sizeof(struct inent)) 441 char *CONFIG = _PATH_INETDCONF; 442 443 static int my_signals[] = 444 { SIGALRM, SIGHUP, SIGCHLD, SIGTERM, SIGINT, SIGPIPE }; 445 446 int 447 main(int argc, char *argv[]) 448 { 449 int ch, n, reload = 1; 450 451 while ((ch = getopt(argc, argv, 452 #ifdef LIBWRAP 453 "dl" 454 #else 455 "d" 456 #endif 457 )) != -1) 458 switch(ch) { 459 case 'd': 460 debug = 1; 461 options |= SO_DEBUG; 462 break; 463 #ifdef LIBWRAP 464 case 'l': 465 lflag = 1; 466 break; 467 #endif 468 case '?': 469 default: 470 usage(); 471 } 472 argc -= optind; 473 argv += optind; 474 475 if (argc > 0) 476 CONFIG = argv[0]; 477 478 if (!debug) 479 daemon(0, 0); 480 openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON); 481 pidfile(NULL); 482 483 kq = kqueue(); 484 if (kq < 0) { 485 syslog(LOG_ERR, "kqueue: %m"); 486 return (EXIT_FAILURE); 487 } 488 489 #ifdef RLIMIT_NOFILE 490 if (getrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) { 491 syslog(LOG_ERR, "getrlimit: %m"); 492 } else { 493 rlim_ofile_cur = rlim_ofile.rlim_cur; 494 if (rlim_ofile_cur == RLIM_INFINITY) /* ! */ 495 rlim_ofile_cur = OPEN_MAX; 496 } 497 #endif 498 499 for (n = 0; n < A_CNT(my_signals); n++) { 500 int signum; 501 502 signum = my_signals[n]; 503 (void) signal(signum, SIG_IGN); 504 505 if (signum != SIGPIPE) { 506 struct kevent *ev; 507 508 ev = allocchange(); 509 EV_SET(ev, signum, EVFILT_SIGNAL, EV_ADD | EV_ENABLE, 510 0, 0, NULL); 511 } 512 } 513 514 for (;;) { 515 int ctrl; 516 struct kevent eventbuf[64], *ev; 517 struct servtab *sep; 518 519 if (reload) { 520 reload = 0; 521 config(); 522 } 523 524 n = my_kevent(changebuf, changes, eventbuf, A_CNT(eventbuf)); 525 changes = 0; 526 527 for (ev = eventbuf; n > 0; ev++, n--) { 528 if (ev->filter == EVFILT_SIGNAL) { 529 switch (ev->ident) { 530 case SIGALRM: 531 retry(); 532 break; 533 case SIGCHLD: 534 reapchild(); 535 break; 536 case SIGTERM: 537 case SIGINT: 538 goaway(); 539 break; 540 case SIGHUP: 541 reload = 1; 542 break; 543 } 544 continue; 545 } 546 if (ev->filter != EVFILT_READ) 547 continue; 548 sep = (struct servtab *)ev->udata; 549 /* Paranoia */ 550 if (ev->ident != sep->se_fd) 551 continue; 552 if (debug) 553 fprintf(stderr, "someone wants %s\n", sep->se_service); 554 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 555 /* XXX here do the libwrap check-before-accept */ 556 ctrl = accept(sep->se_fd, NULL, NULL); 557 if (debug) 558 fprintf(stderr, "accept, ctrl %d\n", 559 ctrl); 560 if (ctrl < 0) { 561 if (errno != EINTR) 562 syslog(LOG_WARNING, 563 "accept (for %s): %m", 564 sep->se_service); 565 continue; 566 } 567 } else 568 ctrl = sep->se_fd; 569 spawn(sep, ctrl); 570 } 571 } 572 } 573 574 static void 575 spawn(struct servtab *sep, int ctrl) 576 { 577 int dofork; 578 pid_t pid; 579 580 pid = 0; 581 #ifdef LIBWRAP_INTERNAL 582 dofork = 1; 583 #else 584 dofork = (sep->se_bi == 0 || sep->se_bi->bi_fork); 585 #endif 586 if (dofork) { 587 if (sep->se_count++ == 0) 588 (void)gettimeofday(&sep->se_time, NULL); 589 else if (sep->se_count >= sep->se_max) { 590 struct timeval now; 591 592 (void)gettimeofday(&now, NULL); 593 if (now.tv_sec - sep->se_time.tv_sec > CNT_INTVL) { 594 sep->se_time = now; 595 sep->se_count = 1; 596 } else { 597 syslog(LOG_ERR, 598 "%s/%s server failing (looping), service terminated\n", 599 sep->se_service, sep->se_proto); 600 if (!sep->se_wait && sep->se_socktype == 601 SOCK_STREAM) 602 close(ctrl); 603 close_sep(sep); 604 if (!timingout) { 605 timingout = 1; 606 alarm(RETRYTIME); 607 } 608 return; 609 } 610 } 611 pid = fork(); 612 if (pid < 0) { 613 syslog(LOG_ERR, "fork: %m"); 614 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 615 close(ctrl); 616 sleep(1); 617 return; 618 } 619 if (pid != 0 && sep->se_wait) { 620 struct kevent *ev; 621 622 sep->se_wait = pid; 623 ev = allocchange(); 624 EV_SET(ev, sep->se_fd, EVFILT_READ, 625 EV_DELETE, 0, 0, 0); 626 } 627 if (pid == 0) { 628 int n; 629 630 for (n = 0; n < A_CNT(my_signals); n++) 631 (void) signal(my_signals[n], SIG_DFL); 632 if (debug) 633 setsid(); 634 } 635 } 636 if (pid == 0) { 637 run_service(ctrl, sep); 638 if (dofork) 639 exit(0); 640 } 641 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 642 close(ctrl); 643 } 644 645 static void 646 run_service(int ctrl, struct servtab *sep) 647 { 648 struct passwd *pwd; 649 struct group *grp = NULL; /* XXX gcc */ 650 char buf[NI_MAXSERV]; 651 #ifdef LIBWRAP 652 struct request_info req; 653 int denied; 654 char *service = NULL; /* XXX gcc */ 655 #endif 656 657 #ifdef LIBWRAP 658 #ifndef LIBWRAP_INTERNAL 659 if (sep->se_bi == 0) 660 #endif 661 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 662 request_init(&req, RQ_DAEMON, sep->se_argv[0] ? 663 sep->se_argv[0] : sep->se_service, RQ_FILE, ctrl, NULL); 664 fromhost(&req); 665 denied = !hosts_access(&req); 666 if (denied || lflag) { 667 if (getnameinfo(&sep->se_ctrladdr, 668 sep->se_ctrladdr.sa_len, NULL, 0, 669 buf, sizeof(buf), 0) != 0) { 670 /* shouldn't happen */ 671 (void)snprintf(buf, sizeof buf, "%d", 672 ntohs(sep->se_ctrladdr_in.sin_port)); 673 } 674 service = buf; 675 } 676 if (denied) { 677 syslog(deny_severity, 678 "refused connection from %.500s, service %s (%s)", 679 eval_client(&req), service, sep->se_proto); 680 goto reject; 681 } 682 if (lflag) { 683 syslog(allow_severity, 684 "connection from %.500s, service %s (%s)", 685 eval_client(&req), service, sep->se_proto); 686 } 687 } 688 #endif /* LIBWRAP */ 689 690 if (sep->se_bi) { 691 (*sep->se_bi->bi_fn)(ctrl, sep); 692 } else { 693 if ((pwd = getpwnam(sep->se_user)) == NULL) { 694 syslog(LOG_ERR, "%s/%s: %s: No such user", 695 sep->se_service, sep->se_proto, sep->se_user); 696 goto reject; 697 } 698 if (sep->se_group && 699 (grp = getgrnam(sep->se_group)) == NULL) { 700 syslog(LOG_ERR, "%s/%s: %s: No such group", 701 sep->se_service, sep->se_proto, sep->se_group); 702 goto reject; 703 } 704 if (pwd->pw_uid) { 705 if (sep->se_group) 706 pwd->pw_gid = grp->gr_gid; 707 if (setgid(pwd->pw_gid) < 0) { 708 syslog(LOG_ERR, 709 "%s/%s: can't set gid %d: %m", sep->se_service, 710 sep->se_proto, pwd->pw_gid); 711 goto reject; 712 } 713 (void) initgroups(pwd->pw_name, 714 pwd->pw_gid); 715 if (setuid(pwd->pw_uid) < 0) { 716 syslog(LOG_ERR, 717 "%s/%s: can't set uid %d: %m", sep->se_service, 718 sep->se_proto, pwd->pw_uid); 719 goto reject; 720 } 721 } else if (sep->se_group) { 722 (void) setgid((gid_t)grp->gr_gid); 723 } 724 if (debug) 725 fprintf(stderr, "%d execl %s\n", 726 getpid(), sep->se_server); 727 #ifdef MULOG 728 if (sep->se_log) 729 dolog(sep, ctrl); 730 #endif 731 /* Set our control descriptor to not close-on-exec... */ 732 if (fcntl(ctrl, F_SETFD, 0) < 0) 733 syslog(LOG_ERR, "fcntl (F_SETFD, 0): %m"); 734 /* ...and dup it to stdin, stdout, and stderr. */ 735 if (ctrl != 0) { 736 dup2(ctrl, 0); 737 close(ctrl); 738 ctrl = 0; 739 } 740 dup2(0, 1); 741 dup2(0, 2); 742 #ifdef RLIMIT_NOFILE 743 if (rlim_ofile.rlim_cur != rlim_ofile_cur && 744 setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) 745 syslog(LOG_ERR, "setrlimit: %m"); 746 #endif 747 execv(sep->se_server, sep->se_argv); 748 syslog(LOG_ERR, "cannot execute %s: %m", sep->se_server); 749 reject: 750 if (sep->se_socktype != SOCK_STREAM) 751 recv(ctrl, buf, sizeof (buf), 0); 752 _exit(1); 753 } 754 } 755 756 static void 757 reapchild(void) 758 { 759 int status; 760 pid_t pid; 761 struct servtab *sep; 762 763 for (;;) { 764 pid = wait3(&status, WNOHANG, NULL); 765 if (pid <= 0) 766 break; 767 if (debug) 768 (void) fprintf(stderr, "%d reaped, status %#x\n", 769 pid, status); 770 for (sep = servtab; sep != NULL; sep = sep->se_next) 771 if (sep->se_wait == pid) { 772 struct kevent *ev; 773 774 if (WIFEXITED(status) && WEXITSTATUS(status)) 775 syslog(LOG_WARNING, 776 "%s: exit status 0x%x", 777 sep->se_server, WEXITSTATUS(status)); 778 else if (WIFSIGNALED(status)) 779 syslog(LOG_WARNING, 780 "%s: exit signal 0x%x", 781 sep->se_server, WTERMSIG(status)); 782 sep->se_wait = 1; 783 ev = allocchange(); 784 EV_SET(ev, sep->se_fd, EVFILT_READ, 785 EV_ADD | EV_ENABLE, 0, 0, (intptr_t)sep); 786 if (debug) 787 fprintf(stderr, "restored %s, fd %d\n", 788 sep->se_service, sep->se_fd); 789 } 790 } 791 } 792 793 static void 794 config(void) 795 { 796 struct servtab *sep, *cp, **sepp; 797 int n; 798 799 if (!setconfig()) { 800 syslog(LOG_ERR, "%s: %m", CONFIG); 801 return; 802 } 803 for (sep = servtab; sep != NULL; sep = sep->se_next) 804 sep->se_checked = 0; 805 while ((cp = getconfigent())) { 806 for (sep = servtab; sep != NULL; sep = sep->se_next) 807 if (strcmp(sep->se_service, cp->se_service) == 0 && 808 strcmp(sep->se_hostaddr, cp->se_hostaddr) == 0 && 809 strcmp(sep->se_proto, cp->se_proto) == 0 && 810 ISMUX(sep) == ISMUX(cp)) 811 break; 812 if (sep != NULL) { 813 int i; 814 815 #define SWAP(type, a, b) {type c=(type)a; (type)a=(type)b; (type)b=(type)c;} 816 817 /* 818 * sep->se_wait may be holding the pid of a daemon 819 * that we're waiting for. If so, don't overwrite 820 * it unless the config file explicitly says don't 821 * wait. 822 */ 823 if (cp->se_bi == 0 && 824 (sep->se_wait == 1 || cp->se_wait == 0)) 825 sep->se_wait = cp->se_wait; 826 SWAP(char *, sep->se_user, cp->se_user); 827 SWAP(char *, sep->se_group, cp->se_group); 828 SWAP(char *, sep->se_server, cp->se_server); 829 for (i = 0; i < MAXARGV; i++) 830 SWAP(char *, sep->se_argv[i], cp->se_argv[i]); 831 #ifdef IPSEC 832 SWAP(char *, sep->se_policy, cp->se_policy); 833 #endif 834 SWAP(int, cp->se_type, sep->se_type); 835 SWAP(int, cp->se_max, sep->se_max); 836 #undef SWAP 837 if (isrpcservice(sep)) 838 unregister_rpc(sep); 839 sep->se_rpcversl = cp->se_rpcversl; 840 sep->se_rpcversh = cp->se_rpcversh; 841 freeconfig(cp); 842 if (debug) 843 print_service("REDO", sep); 844 } else { 845 sep = enter(cp); 846 if (debug) 847 print_service("ADD ", sep); 848 } 849 sep->se_checked = 1; 850 851 switch (sep->se_family) { 852 case AF_LOCAL: 853 if (sep->se_fd != -1) 854 break; 855 n = strlen(sep->se_service); 856 if (n > sizeof(sep->se_ctrladdr_un.sun_path)) { 857 syslog(LOG_ERR, "%s: address too long", 858 sep->se_service); 859 sep->se_checked = 0; 860 continue; 861 } 862 (void)unlink(sep->se_service); 863 strncpy(sep->se_ctrladdr_un.sun_path, 864 sep->se_service, n); 865 sep->se_ctrladdr_un.sun_family = AF_LOCAL; 866 sep->se_ctrladdr_size = n + 867 sizeof(sep->se_ctrladdr_un) - 868 sizeof(sep->se_ctrladdr_un.sun_path); 869 if (!ISMUX(sep)) 870 setup(sep); 871 break; 872 case AF_INET: 873 #ifdef INET6 874 case AF_INET6: 875 #endif 876 { 877 struct addrinfo hints, *res; 878 char *host, *port; 879 int error; 880 int s; 881 882 /* check if the family is supported */ 883 s = socket(sep->se_family, SOCK_DGRAM, 0); 884 if (s < 0) { 885 syslog(LOG_WARNING, 886 "%s/%s: %s: the address family is not supported by the kernel", 887 sep->se_service, sep->se_proto, 888 sep->se_hostaddr); 889 sep->se_checked = 0; 890 continue; 891 } 892 close(s); 893 894 memset(&hints, 0, sizeof(hints)); 895 hints.ai_family = sep->se_family; 896 hints.ai_socktype = sep->se_socktype; 897 hints.ai_flags = AI_PASSIVE; 898 if (!strcmp(sep->se_hostaddr, "*")) 899 host = NULL; 900 else 901 host = sep->se_hostaddr; 902 if (isrpcservice(sep) || ISMUX(sep)) 903 port = "0"; 904 else 905 port = sep->se_service; 906 error = getaddrinfo(host, port, &hints, &res); 907 if (error) { 908 if (error == EAI_SERVICE) { 909 /* gai_strerror not friendly enough */ 910 syslog(LOG_WARNING, "%s/%s: " 911 "unknown service", 912 sep->se_service, sep->se_proto); 913 } else { 914 syslog(LOG_ERR, "%s/%s: %s: %s", 915 sep->se_service, sep->se_proto, 916 sep->se_hostaddr, 917 gai_strerror(error)); 918 } 919 sep->se_checked = 0; 920 continue; 921 } 922 if (res->ai_next) { 923 syslog(LOG_ERR, 924 "%s/%s: %s: resolved to multiple addr", 925 sep->se_service, sep->se_proto, 926 sep->se_hostaddr); 927 sep->se_checked = 0; 928 freeaddrinfo(res); 929 continue; 930 } 931 memcpy(&sep->se_ctrladdr, res->ai_addr, 932 res->ai_addrlen); 933 if (ISMUX(sep)) { 934 sep->se_fd = -1; 935 freeaddrinfo(res); 936 continue; 937 } 938 sep->se_ctrladdr_size = res->ai_addrlen; 939 freeaddrinfo(res); 940 #ifdef RPC 941 if (isrpcservice(sep)) { 942 struct rpcent *rp; 943 944 sep->se_rpcprog = atoi(sep->se_service); 945 if (sep->se_rpcprog == 0) { 946 rp = getrpcbyname(sep->se_service); 947 if (rp == 0) { 948 syslog(LOG_ERR, 949 "%s/%s: unknown service", 950 sep->se_service, 951 sep->se_proto); 952 sep->se_checked = 0; 953 continue; 954 } 955 sep->se_rpcprog = rp->r_number; 956 } 957 if (sep->se_fd == -1 && !ISMUX(sep)) 958 setup(sep); 959 if (sep->se_fd != -1) 960 register_rpc(sep); 961 } else 962 #endif 963 { 964 if (sep->se_fd >= 0) 965 close_sep(sep); 966 if (sep->se_fd == -1 && !ISMUX(sep)) 967 setup(sep); 968 } 969 } 970 } 971 } 972 endconfig(); 973 /* 974 * Purge anything not looked at above. 975 */ 976 sepp = &servtab; 977 while ((sep = *sepp)) { 978 if (sep->se_checked) { 979 sepp = &sep->se_next; 980 continue; 981 } 982 *sepp = sep->se_next; 983 if (sep->se_fd >= 0) 984 close_sep(sep); 985 if (isrpcservice(sep)) 986 unregister_rpc(sep); 987 if (sep->se_family == AF_LOCAL) 988 (void)unlink(sep->se_service); 989 if (debug) 990 print_service("FREE", sep); 991 freeconfig(sep); 992 free(sep); 993 } 994 } 995 996 static void 997 retry(void) 998 { 999 struct servtab *sep; 1000 1001 timingout = 0; 1002 for (sep = servtab; sep != NULL; sep = sep->se_next) { 1003 if (sep->se_fd == -1 && !ISMUX(sep)) { 1004 switch (sep->se_family) { 1005 case AF_LOCAL: 1006 case AF_INET: 1007 #ifdef INET6 1008 case AF_INET6: 1009 #endif 1010 setup(sep); 1011 if (sep->se_fd != -1 && isrpcservice(sep)) 1012 register_rpc(sep); 1013 break; 1014 } 1015 } 1016 } 1017 } 1018 1019 static void 1020 goaway(void) 1021 { 1022 struct servtab *sep; 1023 1024 for (sep = servtab; sep != NULL; sep = sep->se_next) { 1025 if (sep->se_fd == -1) 1026 continue; 1027 1028 switch (sep->se_family) { 1029 case AF_LOCAL: 1030 (void)unlink(sep->se_service); 1031 break; 1032 case AF_INET: 1033 #ifdef INET6 1034 case AF_INET6: 1035 #endif 1036 if (sep->se_wait == 1 && isrpcservice(sep)) 1037 unregister_rpc(sep); 1038 break; 1039 } 1040 (void)close(sep->se_fd); 1041 } 1042 exit(0); 1043 } 1044 1045 static void 1046 setup(struct servtab *sep) 1047 { 1048 int on = 1, off = 0; 1049 struct kevent *ev; 1050 1051 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) { 1052 if (debug) 1053 fprintf(stderr, "socket failed on %s/%s: %s\n", 1054 sep->se_service, sep->se_proto, strerror(errno)); 1055 syslog(LOG_ERR, "%s/%s: socket: %m", 1056 sep->se_service, sep->se_proto); 1057 return; 1058 } 1059 /* Set all listening sockets to close-on-exec. */ 1060 if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) { 1061 syslog(LOG_ERR, "%s/%s: fcntl(F_SETFD, FD_CLOEXEC): %m", 1062 sep->se_service, sep->se_proto); 1063 close(sep->se_fd); 1064 return; 1065 } 1066 1067 #define turnon(fd, opt) \ 1068 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 1069 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 1070 turnon(sep->se_fd, SO_DEBUG) < 0) 1071 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 1072 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 1073 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 1074 #undef turnon 1075 1076 /* Set the socket buffer sizes, if specified. */ 1077 if (sep->se_sndbuf != 0 && setsockopt(sep->se_fd, SOL_SOCKET, 1078 SO_SNDBUF, (char *)&sep->se_sndbuf, sizeof(sep->se_sndbuf)) < 0) 1079 syslog(LOG_ERR, "setsockopt (SO_SNDBUF %d): %m", 1080 sep->se_sndbuf); 1081 if (sep->se_rcvbuf != 0 && setsockopt(sep->se_fd, SOL_SOCKET, 1082 SO_RCVBUF, (char *)&sep->se_rcvbuf, sizeof(sep->se_rcvbuf)) < 0) 1083 syslog(LOG_ERR, "setsockopt (SO_RCVBUF %d): %m", 1084 sep->se_rcvbuf); 1085 #ifdef INET6 1086 if (sep->se_family == AF_INET6) { 1087 int *v; 1088 v = (sep->se_type == FAITH_TYPE) ? &on : &off; 1089 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_FAITH, 1090 (char *)v, sizeof(*v)) < 0) 1091 syslog(LOG_ERR, "setsockopt (IPV6_FAITH): %m"); 1092 } 1093 #endif 1094 #ifdef IPSEC 1095 if (ipsecsetup(sep->se_family, sep->se_fd, sep->se_policy) < 0 && 1096 sep->se_policy) { 1097 syslog(LOG_ERR, "%s/%s: ipsec setup failed", 1098 sep->se_service, sep->se_proto); 1099 (void)close(sep->se_fd); 1100 sep->se_fd = -1; 1101 return; 1102 } 1103 #endif 1104 1105 if (bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size) < 0) { 1106 if (debug) 1107 fprintf(stderr, "bind failed on %s/%s: %s\n", 1108 sep->se_service, sep->se_proto, strerror(errno)); 1109 syslog(LOG_ERR, "%s/%s: bind: %m", 1110 sep->se_service, sep->se_proto); 1111 (void) close(sep->se_fd); 1112 sep->se_fd = -1; 1113 if (!timingout) { 1114 timingout = 1; 1115 alarm(RETRYTIME); 1116 } 1117 return; 1118 } 1119 if (sep->se_socktype == SOCK_STREAM) 1120 listen(sep->se_fd, 10); 1121 1122 ev = allocchange(); 1123 EV_SET(ev, sep->se_fd, EVFILT_READ, EV_ADD | EV_ENABLE, 0, 0, 1124 (intptr_t)sep); 1125 if (sep->se_fd > maxsock) { 1126 maxsock = sep->se_fd; 1127 if (maxsock > rlim_ofile_cur - FD_MARGIN) 1128 bump_nofile(); 1129 } 1130 if (debug) 1131 fprintf(stderr, "registered %s on %d\n", 1132 sep->se_server, sep->se_fd); 1133 } 1134 1135 /* 1136 * Finish with a service and its socket. 1137 */ 1138 static void 1139 close_sep(struct servtab *sep) 1140 { 1141 if (sep->se_fd >= 0) { 1142 (void) close(sep->se_fd); 1143 sep->se_fd = -1; 1144 } 1145 sep->se_count = 0; 1146 } 1147 1148 static void 1149 register_rpc(struct servtab *sep) 1150 { 1151 #ifdef RPC 1152 int n; 1153 struct netbuf nbuf; 1154 struct sockaddr_storage ss; 1155 struct netconfig *nconf; 1156 1157 if ((nconf = getnetconfigent(sep->se_proto+4)) == NULL) { 1158 syslog(LOG_ERR, "%s: getnetconfigent failed", 1159 sep->se_proto); 1160 return; 1161 } 1162 n = sizeof ss; 1163 if (getsockname(sep->se_fd, (struct sockaddr *)&ss, &n) < 0) { 1164 syslog(LOG_ERR, "%s/%s: getsockname: %m", 1165 sep->se_service, sep->se_proto); 1166 return; 1167 } 1168 1169 nbuf.buf = &ss; 1170 nbuf.len = ss.ss_len; 1171 nbuf.maxlen = sizeof (struct sockaddr_storage); 1172 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1173 if (debug) 1174 fprintf(stderr, "rpcb_set: %u %d %s %s\n", 1175 sep->se_rpcprog, n, nconf->nc_netid, 1176 taddr2uaddr(nconf, &nbuf)); 1177 (void)rpcb_unset(sep->se_rpcprog, n, nconf); 1178 if (!rpcb_set(sep->se_rpcprog, n, nconf, &nbuf)) 1179 syslog(LOG_ERR, "rpcb_set: %u %d %s %s%s", 1180 sep->se_rpcprog, n, nconf->nc_netid, 1181 taddr2uaddr(nconf, &nbuf), clnt_spcreateerror("")); 1182 } 1183 #endif /* RPC */ 1184 } 1185 1186 static void 1187 unregister_rpc(struct servtab *sep) 1188 { 1189 #ifdef RPC 1190 int n; 1191 struct netconfig *nconf; 1192 1193 if ((nconf = getnetconfigent(sep->se_proto+4)) == NULL) { 1194 syslog(LOG_ERR, "%s: getnetconfigent failed", 1195 sep->se_proto); 1196 return; 1197 } 1198 1199 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1200 if (debug) 1201 fprintf(stderr, "rpcb_unset(%u, %d, %s)\n", 1202 sep->se_rpcprog, n, nconf->nc_netid); 1203 if (!rpcb_unset(sep->se_rpcprog, n, nconf)) 1204 syslog(LOG_ERR, "rpcb_unset(%u, %d, %s) failed\n", 1205 sep->se_rpcprog, n, nconf->nc_netid); 1206 } 1207 #endif /* RPC */ 1208 } 1209 1210 1211 static struct servtab * 1212 enter(struct servtab *cp) 1213 { 1214 struct servtab *sep; 1215 1216 sep = (struct servtab *)malloc(sizeof (*sep)); 1217 if (sep == NULL) { 1218 syslog(LOG_ERR, "Out of memory."); 1219 exit(1); 1220 } 1221 *sep = *cp; 1222 sep->se_fd = -1; 1223 sep->se_rpcprog = -1; 1224 sep->se_next = servtab; 1225 servtab = sep; 1226 return (sep); 1227 } 1228 1229 FILE *fconfig = NULL; 1230 struct servtab serv; 1231 char line[LINE_MAX]; 1232 char *defhost; 1233 #ifdef IPSEC 1234 static char *policy = NULL; 1235 #endif 1236 1237 static int 1238 setconfig(void) 1239 { 1240 if (defhost) 1241 free(defhost); 1242 defhost = newstr("*"); 1243 #ifdef IPSEC 1244 if (policy) 1245 free(policy); 1246 policy = NULL; 1247 #endif 1248 if (fconfig != NULL) { 1249 fseek(fconfig, 0L, SEEK_SET); 1250 return (1); 1251 } 1252 fconfig = fopen(CONFIG, "r"); 1253 return (fconfig != NULL); 1254 } 1255 1256 static void 1257 endconfig(void) 1258 { 1259 if (fconfig != NULL) { 1260 (void) fclose(fconfig); 1261 fconfig = NULL; 1262 } 1263 if (defhost != NULL) { 1264 free(defhost); 1265 defhost = NULL; 1266 } 1267 } 1268 1269 static struct servtab * 1270 getconfigent(void) 1271 { 1272 struct servtab *sep = &serv; 1273 int argc, val; 1274 char *cp, *cp0, *arg, *buf0, *buf1, *sz0, *sz1; 1275 static char TCPMUX_TOKEN[] = "tcpmux/"; 1276 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) 1277 char *hostdelim; 1278 1279 more: 1280 while ((cp = nextline(fconfig))) { 1281 #ifdef IPSEC 1282 /* lines starting with #@ is not a comment, but the policy */ 1283 if (cp[0] == '#' && cp[1] == '@') { 1284 char *p; 1285 for (p = cp + 2; p && *p && isspace(*p); p++) 1286 ; 1287 if (*p == '\0') { 1288 if (policy) 1289 free(policy); 1290 policy = NULL; 1291 } else { 1292 if (ipsecsetup_test(p) < 0) { 1293 syslog(LOG_ERR, 1294 "%s: invalid ipsec policy \"%s\"", 1295 CONFIG, p); 1296 exit(1); 1297 } else { 1298 if (policy) 1299 free(policy); 1300 policy = newstr(p); 1301 } 1302 } 1303 } 1304 #endif 1305 if (*cp == '#' || *cp == '\0') 1306 continue; 1307 #ifdef MULOG 1308 /* Avoid use of `skip' if there is a danger of it looking 1309 * at continuation lines. 1310 */ 1311 do { 1312 cp++; 1313 } while (*cp == ' ' || *cp == '\t'); 1314 if (*cp == '\0') 1315 continue; 1316 if ((arg = skip(&cp)) == NULL) 1317 continue; 1318 if (strcmp(arg, "DOMAIN")) 1319 continue; 1320 if (curdom) 1321 free(curdom); 1322 curdom = NULL; 1323 while (*cp == ' ' || *cp == '\t') 1324 cp++; 1325 if (*cp == '\0') 1326 continue; 1327 arg = cp; 1328 while (*cp && *cp != ' ' && *cp != '\t') 1329 cp++; 1330 if (*cp != '\0') 1331 *cp++ = '\0'; 1332 curdom = newstr(arg); 1333 #endif 1334 break; 1335 } 1336 if (cp == NULL) 1337 return (NULL); 1338 /* 1339 * clear the static buffer, since some fields (se_ctrladdr, 1340 * for example) don't get initialized here. 1341 */ 1342 memset((caddr_t)sep, 0, sizeof *sep); 1343 arg = skip(&cp); 1344 if (cp == NULL) { 1345 /* got an empty line containing just blanks/tabs. */ 1346 goto more; 1347 } 1348 /* Check for a host name. */ 1349 hostdelim = strrchr(arg, ':'); 1350 if (hostdelim) { 1351 *hostdelim = '\0'; 1352 if (arg[0] == '[' && hostdelim > arg && hostdelim[-1] == ']') { 1353 hostdelim[-1] = '\0'; 1354 sep->se_hostaddr = newstr(arg + 1); 1355 } else 1356 sep->se_hostaddr = newstr(arg); 1357 arg = hostdelim + 1; 1358 /* 1359 * If the line is of the form `host:', then just change the 1360 * default host for the following lines. 1361 */ 1362 if (*arg == '\0') { 1363 arg = skip(&cp); 1364 if (cp == NULL) { 1365 free(defhost); 1366 defhost = sep->se_hostaddr; 1367 goto more; 1368 } 1369 } 1370 } else 1371 sep->se_hostaddr = newstr(defhost); 1372 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1373 char *c = arg + MUX_LEN; 1374 if (*c == '+') { 1375 sep->se_type = MUXPLUS_TYPE; 1376 c++; 1377 } else 1378 sep->se_type = MUX_TYPE; 1379 sep->se_service = newstr(c); 1380 } else { 1381 sep->se_service = newstr(arg); 1382 sep->se_type = NORM_TYPE; 1383 } 1384 1385 arg = sskip(&cp); 1386 if (strcmp(arg, "stream") == 0) 1387 sep->se_socktype = SOCK_STREAM; 1388 else if (strcmp(arg, "dgram") == 0) 1389 sep->se_socktype = SOCK_DGRAM; 1390 else if (strcmp(arg, "rdm") == 0) 1391 sep->se_socktype = SOCK_RDM; 1392 else if (strcmp(arg, "seqpacket") == 0) 1393 sep->se_socktype = SOCK_SEQPACKET; 1394 else if (strcmp(arg, "raw") == 0) 1395 sep->se_socktype = SOCK_RAW; 1396 else 1397 sep->se_socktype = -1; 1398 1399 arg = sskip(&cp); 1400 if (sep->se_type == NORM_TYPE && 1401 strncmp(arg, "faith/", strlen("faith/")) == 0) { 1402 arg += strlen("faith/"); 1403 sep->se_type = FAITH_TYPE; 1404 } 1405 sep->se_proto = newstr(arg); 1406 1407 #define MALFORMED(arg) \ 1408 do { \ 1409 syslog(LOG_ERR, "%s: malformed buffer size option `%s'", \ 1410 sep->se_service, (arg)); \ 1411 goto more; \ 1412 } while (0) 1413 1414 #define GETVAL(arg) \ 1415 do { \ 1416 if (!isdigit(*(arg))) \ 1417 MALFORMED(arg); \ 1418 val = strtol((arg), &cp0, 10); \ 1419 if (cp0 != NULL) { \ 1420 if (cp0[1] != '\0') \ 1421 MALFORMED((arg)); \ 1422 if (cp0[0] == 'k') \ 1423 val *= 1024; \ 1424 if (cp0[0] == 'm') \ 1425 val *= 1024 * 1024; \ 1426 } \ 1427 if (val < 1) { \ 1428 syslog(LOG_ERR, "%s: invalid buffer size `%s'", \ 1429 sep->se_service, (arg)); \ 1430 goto more; \ 1431 } \ 1432 } while (0) 1433 1434 #define ASSIGN(arg) \ 1435 do { \ 1436 if (strcmp((arg), "sndbuf") == 0) \ 1437 sep->se_sndbuf = val; \ 1438 else if (strcmp((arg), "rcvbuf") == 0) \ 1439 sep->se_rcvbuf = val; \ 1440 else \ 1441 MALFORMED((arg)); \ 1442 } while (0) 1443 1444 /* 1445 * Extract the send and receive buffer sizes before parsing 1446 * the protocol. 1447 */ 1448 sep->se_sndbuf = sep->se_rcvbuf = 0; 1449 buf0 = buf1 = sz0 = sz1 = NULL; 1450 if ((buf0 = strchr(sep->se_proto, ',')) != NULL) { 1451 /* Not meaningful for Tcpmux services. */ 1452 if (ISMUX(sep)) { 1453 syslog(LOG_ERR, "%s: can't specify buffer sizes for " 1454 "tcpmux services", sep->se_service); 1455 goto more; 1456 } 1457 1458 /* Skip the , */ 1459 *buf0++ = '\0'; 1460 1461 /* Check to see if another socket buffer size was specified. */ 1462 if ((buf1 = strchr(buf0, ',')) != NULL) { 1463 /* Skip the , */ 1464 *buf1++ = '\0'; 1465 1466 /* Make sure a 3rd one wasn't specified. */ 1467 if (strchr(buf1, ',') != NULL) { 1468 syslog(LOG_ERR, "%s: too many buffer sizes", 1469 sep->se_service); 1470 goto more; 1471 } 1472 1473 /* Locate the size. */ 1474 if ((sz1 = strchr(buf1, '=')) == NULL) 1475 MALFORMED(buf1); 1476 1477 /* Skip the = */ 1478 *sz1++ = '\0'; 1479 } 1480 1481 /* Locate the size. */ 1482 if ((sz0 = strchr(buf0, '=')) == NULL) 1483 MALFORMED(buf0); 1484 1485 /* Skip the = */ 1486 *sz0++ = '\0'; 1487 1488 GETVAL(sz0); 1489 ASSIGN(buf0); 1490 1491 if (buf1 != NULL) { 1492 GETVAL(sz1); 1493 ASSIGN(buf1); 1494 } 1495 } 1496 1497 #undef ASSIGN 1498 #undef GETVAL 1499 #undef MALFORMED 1500 1501 if (strcmp(sep->se_proto, "unix") == 0) { 1502 sep->se_family = AF_LOCAL; 1503 } else { 1504 val = strlen(sep->se_proto); 1505 if (!val) { 1506 syslog(LOG_ERR, "%s: invalid protocol specified", 1507 sep->se_service); 1508 goto more; 1509 } 1510 val = sep->se_proto[val - 1]; 1511 switch (val) { 1512 case '4': /*tcp4 or udp4*/ 1513 sep->se_family = AF_INET; 1514 break; 1515 #ifdef INET6 1516 case '6': /*tcp6 or udp6*/ 1517 sep->se_family = AF_INET6; 1518 break; 1519 #endif 1520 default: 1521 sep->se_family = AF_INET; /*will become AF_INET6*/ 1522 break; 1523 } 1524 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1525 #ifdef RPC 1526 char *cp, *ccp; 1527 cp = strchr(sep->se_service, '/'); 1528 if (cp == 0) { 1529 syslog(LOG_ERR, "%s: no rpc version", 1530 sep->se_service); 1531 goto more; 1532 } 1533 *cp++ = '\0'; 1534 sep->se_rpcversl = sep->se_rpcversh = 1535 strtol(cp, &ccp, 0); 1536 if (ccp == cp) { 1537 badafterall: 1538 syslog(LOG_ERR, "%s/%s: bad rpc version", 1539 sep->se_service, cp); 1540 goto more; 1541 } 1542 if (*ccp == '-') { 1543 cp = ccp + 1; 1544 sep->se_rpcversh = strtol(cp, &ccp, 0); 1545 if (ccp == cp) 1546 goto badafterall; 1547 } 1548 #else 1549 syslog(LOG_ERR, "%s: rpc services not suported", 1550 sep->se_service); 1551 goto more; 1552 #endif /* RPC */ 1553 } 1554 } 1555 arg = sskip(&cp); 1556 { 1557 char *cp; 1558 if ((cp = strchr(arg, ':')) == NULL) 1559 cp = strchr(arg, '.'); 1560 if (cp != NULL) { 1561 *cp++ = '\0'; 1562 sep->se_max = atoi(cp); 1563 } else 1564 sep->se_max = TOOMANY; 1565 } 1566 sep->se_wait = strcmp(arg, "wait") == 0; 1567 if (ISMUX(sep)) { 1568 /* 1569 * Silently enforce "nowait" for TCPMUX services since 1570 * they don't have an assigned port to listen on. 1571 */ 1572 sep->se_wait = 0; 1573 1574 if (strncmp(sep->se_proto, "tcp", 3)) { 1575 syslog(LOG_ERR, 1576 "%s: bad protocol for tcpmux service %s", 1577 CONFIG, sep->se_service); 1578 goto more; 1579 } 1580 if (sep->se_socktype != SOCK_STREAM) { 1581 syslog(LOG_ERR, 1582 "%s: bad socket type for tcpmux service %s", 1583 CONFIG, sep->se_service); 1584 goto more; 1585 } 1586 } 1587 sep->se_user = newstr(sskip(&cp)); 1588 if ((sep->se_group = strchr(sep->se_user, ':')) != NULL) 1589 *sep->se_group++ = '\0'; 1590 else if ((sep->se_group = strchr(sep->se_user, '.')) != NULL) 1591 *sep->se_group++ = '\0'; 1592 1593 sep->se_server = newstr(sskip(&cp)); 1594 if (strcmp(sep->se_server, "internal") == 0) { 1595 struct biltin *bi; 1596 1597 for (bi = biltins; bi->bi_service; bi++) 1598 if (bi->bi_socktype == sep->se_socktype && 1599 strcmp(bi->bi_service, sep->se_service) == 0) 1600 break; 1601 if (bi->bi_service == 0) { 1602 syslog(LOG_ERR, "internal service %s unknown", 1603 sep->se_service); 1604 goto more; 1605 } 1606 sep->se_bi = bi; 1607 sep->se_wait = bi->bi_wait; 1608 } else 1609 sep->se_bi = NULL; 1610 argc = 0; 1611 for (arg = skip(&cp); cp; arg = skip(&cp)) { 1612 #if MULOG 1613 char *colon; 1614 1615 if (argc == 0 && (colon = strrchr(arg, ':'))) { 1616 while (arg < colon) { 1617 int x; 1618 char *ccp; 1619 1620 switch (*arg++) { 1621 case 'l': 1622 x = 1; 1623 if (isdigit(*arg)) { 1624 x = strtol(arg, &ccp, 0); 1625 if (ccp == arg) 1626 break; 1627 arg = ccp; 1628 } 1629 sep->se_log &= ~MULOG_RFC931; 1630 sep->se_log |= x; 1631 break; 1632 case 'a': 1633 sep->se_log |= MULOG_RFC931; 1634 break; 1635 default: 1636 break; 1637 } 1638 } 1639 arg = colon + 1; 1640 } 1641 #endif 1642 if (argc < MAXARGV) 1643 sep->se_argv[argc++] = newstr(arg); 1644 } 1645 while (argc <= MAXARGV) 1646 sep->se_argv[argc++] = NULL; 1647 #ifdef IPSEC 1648 sep->se_policy = policy ? newstr(policy) : NULL; 1649 #endif 1650 return (sep); 1651 } 1652 1653 static void 1654 freeconfig(struct servtab *cp) 1655 { 1656 int i; 1657 1658 if (cp->se_hostaddr) 1659 free(cp->se_hostaddr); 1660 if (cp->se_service) 1661 free(cp->se_service); 1662 if (cp->se_proto) 1663 free(cp->se_proto); 1664 if (cp->se_user) 1665 free(cp->se_user); 1666 /* Note: se_group is part of the newstr'ed se_user */ 1667 if (cp->se_server) 1668 free(cp->se_server); 1669 for (i = 0; i < MAXARGV; i++) 1670 if (cp->se_argv[i]) 1671 free(cp->se_argv[i]); 1672 #ifdef IPSEC 1673 if (cp->se_policy) 1674 free(cp->se_policy); 1675 #endif 1676 } 1677 1678 1679 /* 1680 * Safe skip - if skip returns null, log a syntax error in the 1681 * configuration file and exit. 1682 */ 1683 static char * 1684 sskip(char **cpp) 1685 { 1686 char *cp; 1687 1688 cp = skip(cpp); 1689 if (cp == NULL) { 1690 syslog(LOG_ERR, "%s: syntax error", CONFIG); 1691 exit(1); 1692 } 1693 return (cp); 1694 } 1695 1696 static char * 1697 skip(char **cpp) 1698 { 1699 char *cp = *cpp; 1700 char *start; 1701 1702 if (*cpp == NULL) 1703 return (NULL); 1704 1705 again: 1706 while (*cp == ' ' || *cp == '\t') 1707 cp++; 1708 if (*cp == '\0') { 1709 int c; 1710 1711 c = getc(fconfig); 1712 (void) ungetc(c, fconfig); 1713 if (c == ' ' || c == '\t') 1714 if ((cp = nextline(fconfig))) 1715 goto again; 1716 *cpp = NULL; 1717 return (NULL); 1718 } 1719 start = cp; 1720 while (*cp && *cp != ' ' && *cp != '\t') 1721 cp++; 1722 if (*cp != '\0') 1723 *cp++ = '\0'; 1724 *cpp = cp; 1725 return (start); 1726 } 1727 1728 static char * 1729 nextline(FILE *fd) 1730 { 1731 char *cp; 1732 1733 if (fgets(line, sizeof (line), fd) == NULL) 1734 return (NULL); 1735 cp = strchr(line, '\n'); 1736 if (cp) 1737 *cp = '\0'; 1738 return (line); 1739 } 1740 1741 static char * 1742 newstr(char *cp) 1743 { 1744 if ((cp = strdup((cp !=NULL )? cp : "")) != NULL) 1745 return (cp); 1746 syslog(LOG_ERR, "strdup: %m"); 1747 exit(1); 1748 } 1749 1750 static void 1751 inetd_setproctitle(char *a, int s) 1752 { 1753 socklen_t size; 1754 struct sockaddr_storage ss; 1755 char hbuf[NI_MAXHOST]; 1756 1757 size = sizeof(ss); 1758 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) { 1759 if (getnameinfo((struct sockaddr *)&ss, size, hbuf, 1760 sizeof(hbuf), NULL, 0, niflags) == 0) 1761 setproctitle("-%s [%s]", a, hbuf); 1762 else 1763 setproctitle("-%s [?]", a); 1764 } else 1765 setproctitle("-%s", a); 1766 } 1767 1768 static void 1769 bump_nofile(void) 1770 { 1771 #ifdef RLIMIT_NOFILE 1772 1773 #define FD_CHUNK 32 1774 1775 struct rlimit rl; 1776 1777 if (getrlimit(RLIMIT_NOFILE, &rl) < 0) { 1778 syslog(LOG_ERR, "getrlimit: %m"); 1779 return; 1780 } 1781 rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK); 1782 if (rl.rlim_cur <= rlim_ofile_cur) { 1783 syslog(LOG_ERR, 1784 "bump_nofile: cannot extend file limit, max = %d", 1785 (int)rl.rlim_cur); 1786 return; 1787 } 1788 1789 if (setrlimit(RLIMIT_NOFILE, &rl) < 0) { 1790 syslog(LOG_ERR, "setrlimit: %m"); 1791 return; 1792 } 1793 1794 rlim_ofile_cur = rl.rlim_cur; 1795 return; 1796 1797 #else 1798 syslog(LOG_ERR, "bump_nofile: cannot extend file limit"); 1799 return; 1800 #endif 1801 } 1802 1803 /* 1804 * Internet services provided internally by inetd: 1805 */ 1806 #define BUFSIZE 4096 1807 1808 /* ARGSUSED */ 1809 static void 1810 echo_stream(int s, struct servtab *sep) /* Echo service -- echo data back */ 1811 { 1812 char buffer[BUFSIZE]; 1813 int i; 1814 1815 inetd_setproctitle(sep->se_service, s); 1816 while ((i = read(s, buffer, sizeof(buffer))) > 0 && 1817 write(s, buffer, i) > 0) 1818 ; 1819 } 1820 1821 /* ARGSUSED */ 1822 static void 1823 echo_dg(int s, struct servtab *sep) /* Echo service -- echo data back */ 1824 { 1825 char buffer[BUFSIZE]; 1826 int i; 1827 socklen_t size; 1828 struct sockaddr_storage ss; 1829 struct sockaddr *sa; 1830 1831 sa = (struct sockaddr *)&ss; 1832 size = sizeof(ss); 1833 if ((i = recvfrom(s, buffer, sizeof(buffer), 0, sa, &size)) < 0) 1834 return; 1835 if (port_good_dg(sa)) 1836 (void) sendto(s, buffer, i, 0, sa, size); 1837 } 1838 1839 /* ARGSUSED */ 1840 static void 1841 discard_stream(int s, struct servtab *sep) /* Discard service -- ignore data */ 1842 { 1843 char buffer[BUFSIZE]; 1844 1845 inetd_setproctitle(sep->se_service, s); 1846 while ((errno = 0, read(s, buffer, sizeof(buffer)) > 0) || 1847 errno == EINTR) 1848 ; 1849 } 1850 1851 /* ARGSUSED */ 1852 static void 1853 discard_dg(int s, struct servtab *sep) /* Discard service -- ignore data */ 1854 1855 { 1856 char buffer[BUFSIZE]; 1857 1858 (void) read(s, buffer, sizeof(buffer)); 1859 } 1860 1861 #include <ctype.h> 1862 #define LINESIZ 72 1863 char ring[128]; 1864 char *endring; 1865 1866 static void 1867 initring(void) 1868 { 1869 int i; 1870 1871 endring = ring; 1872 1873 for (i = 0; i <= 128; ++i) 1874 if (isprint(i)) 1875 *endring++ = i; 1876 } 1877 1878 /* ARGSUSED */ 1879 static void 1880 chargen_stream(int s,struct servtab *sep) /* Character generator */ 1881 { 1882 int len; 1883 char *rs, text[LINESIZ+2]; 1884 1885 inetd_setproctitle(sep->se_service, s); 1886 1887 if (!endring) { 1888 initring(); 1889 rs = ring; 1890 } 1891 1892 text[LINESIZ] = '\r'; 1893 text[LINESIZ + 1] = '\n'; 1894 for (rs = ring;;) { 1895 if ((len = endring - rs) >= LINESIZ) 1896 memmove(text, rs, LINESIZ); 1897 else { 1898 memmove(text, rs, len); 1899 memmove(text + len, ring, LINESIZ - len); 1900 } 1901 if (++rs == endring) 1902 rs = ring; 1903 if (write(s, text, sizeof(text)) != sizeof(text)) 1904 break; 1905 } 1906 } 1907 1908 /* ARGSUSED */ 1909 static void 1910 chargen_dg(int s, struct servtab *sep) /* Character generator */ 1911 { 1912 struct sockaddr_storage ss; 1913 struct sockaddr *sa; 1914 static char *rs; 1915 int len; 1916 socklen_t size; 1917 char text[LINESIZ+2]; 1918 1919 if (endring == 0) { 1920 initring(); 1921 rs = ring; 1922 } 1923 1924 sa = (struct sockaddr *)&ss; 1925 size = sizeof(ss); 1926 if (recvfrom(s, text, sizeof(text), 0, sa, &size) < 0) 1927 return; 1928 1929 if (!port_good_dg(sa)) 1930 return; 1931 1932 if ((len = endring - rs) >= LINESIZ) 1933 memmove(text, rs, LINESIZ); 1934 else { 1935 memmove(text, rs, len); 1936 memmove(text + len, ring, LINESIZ - len); 1937 } 1938 if (++rs == endring) 1939 rs = ring; 1940 text[LINESIZ] = '\r'; 1941 text[LINESIZ + 1] = '\n'; 1942 (void) sendto(s, text, sizeof(text), 0, sa, size); 1943 } 1944 1945 /* 1946 * Return a machine readable date and time, in the form of the 1947 * number of seconds since midnight, Jan 1, 1900. Since gettimeofday 1948 * returns the number of seconds since midnight, Jan 1, 1970, 1949 * we must add 2208988800 seconds to this figure to make up for 1950 * some seventy years Bell Labs was asleep. 1951 */ 1952 1953 static uint32_t 1954 machtime(void) 1955 { 1956 struct timeval tv; 1957 1958 if (gettimeofday(&tv, NULL) < 0) { 1959 if (debug) 1960 fprintf(stderr, "Unable to get time of day\n"); 1961 return (0); 1962 } 1963 #define OFFSET ((uint32_t)25567 * 24*60*60) 1964 return (htonl((uint32_t)(tv.tv_sec + OFFSET))); 1965 #undef OFFSET 1966 } 1967 1968 /* ARGSUSED */ 1969 static void 1970 machtime_stream(int s, struct servtab *sep) 1971 { 1972 uint32_t result; 1973 1974 result = machtime(); 1975 (void) write(s, (char *) &result, sizeof(result)); 1976 } 1977 1978 /* ARGSUSED */ 1979 void 1980 machtime_dg(int s, struct servtab *sep) 1981 { 1982 uint32_t result; 1983 struct sockaddr_storage ss; 1984 struct sockaddr *sa; 1985 socklen_t size; 1986 1987 sa = (struct sockaddr *)&ss; 1988 size = sizeof(ss); 1989 if (recvfrom(s, (char *)&result, sizeof(result), 0, sa, &size) < 0) 1990 return; 1991 if (!port_good_dg(sa)) 1992 return; 1993 result = machtime(); 1994 (void) sendto(s, (char *) &result, sizeof(result), 0, sa, size); 1995 } 1996 1997 /* ARGSUSED */ 1998 static void 1999 daytime_stream(int s,struct servtab *sep) 2000 /* Return human-readable time of day */ 2001 { 2002 char buffer[256]; 2003 time_t clock; 2004 int len; 2005 2006 clock = time((time_t *) 0); 2007 2008 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 2009 (void) write(s, buffer, len); 2010 } 2011 2012 /* ARGSUSED */ 2013 void 2014 daytime_dg(int s, struct servtab *sep) 2015 /* Return human-readable time of day */ 2016 { 2017 char buffer[256]; 2018 time_t clock; 2019 struct sockaddr_storage ss; 2020 struct sockaddr *sa; 2021 socklen_t size; 2022 int len; 2023 2024 clock = time((time_t *) 0); 2025 2026 sa = (struct sockaddr *)&ss; 2027 size = sizeof(ss); 2028 if (recvfrom(s, buffer, sizeof(buffer), 0, sa, &size) < 0) 2029 return; 2030 if (!port_good_dg(sa)) 2031 return; 2032 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 2033 (void) sendto(s, buffer, len, 0, sa, size); 2034 } 2035 2036 /* 2037 * print_service: 2038 * Dump relevant information to stderr 2039 */ 2040 static void 2041 print_service(char *action, struct servtab *sep) 2042 { 2043 2044 if (isrpcservice(sep)) 2045 fprintf(stderr, 2046 "%s: %s rpcprog=%d, rpcvers = %d/%d, proto=%s, wait.max=%d.%d, user:group=%s:%s builtin=%lx server=%s" 2047 #ifdef IPSEC 2048 " policy=\"%s\"" 2049 #endif 2050 "\n", 2051 action, sep->se_service, 2052 sep->se_rpcprog, sep->se_rpcversh, sep->se_rpcversl, sep->se_proto, 2053 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 2054 (long)sep->se_bi, sep->se_server 2055 #ifdef IPSEC 2056 , (sep->se_policy ? sep->se_policy : "") 2057 #endif 2058 ); 2059 else 2060 fprintf(stderr, 2061 "%s: %s proto=%s%s, wait.max=%d.%d, user:group=%s:%s builtin=%lx server=%s" 2062 #ifdef IPSEC 2063 " policy=%s" 2064 #endif 2065 "\n", 2066 action, sep->se_service, 2067 sep->se_type == FAITH_TYPE ? "faith/" : "", 2068 sep->se_proto, 2069 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 2070 (long)sep->se_bi, sep->se_server 2071 #ifdef IPSEC 2072 , (sep->se_policy ? sep->se_policy : "") 2073 #endif 2074 ); 2075 } 2076 2077 static void 2078 usage(void) 2079 { 2080 #ifdef LIBWRAP 2081 (void)fprintf(stderr, "usage: %s [-dl] [conf]\n", getprogname()); 2082 #else 2083 (void)fprintf(stderr, "usage: %s [-d] [conf]\n", getprogname()); 2084 #endif 2085 exit(1); 2086 } 2087 2088 2089 /* 2090 * Based on TCPMUX.C by Mark K. Lottor November 1988 2091 * sri-nic::ps:<mkl>tcpmux.c 2092 */ 2093 2094 static int /* # of characters upto \r,\n or \0 */ 2095 getline(int fd, char *buf, int len) 2096 { 2097 int count = 0, n; 2098 2099 do { 2100 n = read(fd, buf, len-count); 2101 if (n == 0) 2102 return (count); 2103 if (n < 0) 2104 return (-1); 2105 while (--n >= 0) { 2106 if (*buf == '\r' || *buf == '\n' || *buf == '\0') 2107 return (count); 2108 count++; 2109 buf++; 2110 } 2111 } while (count < len); 2112 return (count); 2113 } 2114 2115 #define MAX_SERV_LEN (256+2) /* 2 bytes for \r\n */ 2116 2117 #define strwrite(fd, buf) (void) write(fd, buf, sizeof(buf)-1) 2118 2119 static void 2120 tcpmux(int ctrl, struct servtab *sep) 2121 { 2122 char service[MAX_SERV_LEN+1]; 2123 int len; 2124 2125 /* Get requested service name */ 2126 if ((len = getline(ctrl, service, MAX_SERV_LEN)) < 0) { 2127 strwrite(ctrl, "-Error reading service name\r\n"); 2128 goto reject; 2129 } 2130 service[len] = '\0'; 2131 2132 if (debug) 2133 fprintf(stderr, "tcpmux: someone wants %s\n", service); 2134 2135 /* 2136 * Help is a required command, and lists available services, 2137 * one per line. 2138 */ 2139 if (!strcasecmp(service, "help")) { 2140 strwrite(ctrl, "+Available services:\r\n"); 2141 strwrite(ctrl, "help\r\n"); 2142 for (sep = servtab; sep != NULL; sep = sep->se_next) { 2143 if (!ISMUX(sep)) 2144 continue; 2145 (void)write(ctrl, sep->se_service, 2146 strlen(sep->se_service)); 2147 strwrite(ctrl, "\r\n"); 2148 } 2149 goto reject; 2150 } 2151 2152 /* Try matching a service in inetd.conf with the request */ 2153 for (sep = servtab; sep != NULL; sep = sep->se_next) { 2154 if (!ISMUX(sep)) 2155 continue; 2156 if (!strcasecmp(service, sep->se_service)) { 2157 if (ISMUXPLUS(sep)) 2158 strwrite(ctrl, "+Go\r\n"); 2159 run_service(ctrl, sep); 2160 return; 2161 } 2162 } 2163 strwrite(ctrl, "-Service not available\r\n"); 2164 reject: 2165 _exit(1); 2166 } 2167 2168 #ifdef MULOG 2169 void 2170 dolog(struct servtab *sep, int ctrl) 2171 { 2172 struct sockaddr_storage ss; 2173 struct sockaddr *sa = (struct sockaddr *)&ss; 2174 socklen_t len = sizeof(ss); 2175 char *host, *dp, buf[BUFSIZ]; 2176 int connected = 1; 2177 2178 switch (sep->se_family) { 2179 case AF_INET: 2180 #ifdef INET6 2181 case AF_INET6: 2182 #endif 2183 break; 2184 default: 2185 return; 2186 } 2187 2188 if (getpeername(ctrl, sa, &len) < 0) { 2189 if (errno != ENOTCONN) { 2190 syslog(LOG_ERR, "getpeername: %m"); 2191 return; 2192 } 2193 if (recvfrom(ctrl, buf, sizeof(buf), MSG_PEEK, sa, &len) < 0) { 2194 syslog(LOG_ERR, "recvfrom: %m"); 2195 return; 2196 } 2197 connected = 0; 2198 } 2199 switch (sa->sa_family) { 2200 case AF_INET: 2201 #ifdef INET6 2202 case AF_INET6: 2203 #endif 2204 break; 2205 default: 2206 syslog(LOG_ERR, "unexpected address family %u", sa->sa_family); 2207 return; 2208 } 2209 2210 if (getnameinfo(sa, len, buf, sizeof(buf), NULL, 0, 0) != 0) 2211 strlcpy(buf, "?", sizeof(buf)); 2212 host = buf; 2213 2214 switch (sep->se_log & ~MULOG_RFC931) { 2215 case 0: 2216 return; 2217 case 1: 2218 if (curdom == NULL || *curdom == '\0') 2219 break; 2220 dp = host + strlen(host) - strlen(curdom); 2221 if (dp < host) 2222 break; 2223 if (debug) 2224 fprintf(stderr, "check \"%s\" against curdom \"%s\"\n", 2225 host, curdom); 2226 if (strcasecmp(dp, curdom) == 0) 2227 return; 2228 break; 2229 case 2: 2230 default: 2231 break; 2232 } 2233 2234 openlog("", LOG_NOWAIT, MULOG); 2235 2236 if (connected && (sep->se_log & MULOG_RFC931)) 2237 syslog(LOG_INFO, "%s@%s wants %s", 2238 rfc931_name(sa, ctrl), host, sep->se_service); 2239 else 2240 syslog(LOG_INFO, "%s wants %s", 2241 host, sep->se_service); 2242 } 2243 2244 /* 2245 * From tcp_log by 2246 * Wietse Venema, Eindhoven University of Technology, The Netherlands. 2247 */ 2248 #if 0 2249 static char sccsid[] = "@(#) rfc931.c 1.3 92/08/31 22:54:46"; 2250 #endif 2251 2252 #include <setjmp.h> 2253 2254 #define RFC931_PORT 113 /* Semi-well-known port */ 2255 #define TIMEOUT 4 2256 #define TIMEOUT2 10 2257 2258 static jmp_buf timebuf; 2259 2260 /* timeout - handle timeouts */ 2261 2262 static void 2263 timeout(int sig) 2264 { 2265 longjmp(timebuf, sig); 2266 } 2267 2268 /* rfc931_name - return remote user name */ 2269 2270 char * 2271 rfc931_name(struct sockaddr *there, /* remote link information */ 2272 int ctrl) 2273 { 2274 struct sockaddr_storage here; /* local link information */ 2275 struct sockaddr_storage sin; /* for talking to RFC931 daemon */ 2276 socklen_t length; 2277 int s; 2278 unsigned remote; 2279 unsigned local; 2280 static char user[256]; /* XXX */ 2281 char buf[256]; 2282 char *cp; 2283 char *result = "USER_UNKNOWN"; 2284 int len; 2285 u_int16_t myport, hisport; 2286 2287 /* Find out local port number of our stdin. */ 2288 2289 length = sizeof(here); 2290 if (getsockname(ctrl, (struct sockaddr *) &here, &length) == -1) { 2291 syslog(LOG_ERR, "getsockname: %m"); 2292 return (result); 2293 } 2294 switch (here.ss_family) { 2295 case AF_INET: 2296 myport = ((struct sockaddr_in *)&here)->sin_port; 2297 break; 2298 #ifdef INET6 2299 case AF_INET6: 2300 myport = ((struct sockaddr_in6 *)&here)->sin6_port; 2301 break; 2302 #endif 2303 } 2304 switch (there->sa_family) { 2305 case AF_INET: 2306 hisport = ((struct sockaddr_in *)&there)->sin_port; 2307 break; 2308 #ifdef INET6 2309 case AF_INET6: 2310 hisport = ((struct sockaddr_in6 *)&there)->sin6_port; 2311 break; 2312 #endif 2313 } 2314 /* Set up timer so we won't get stuck. */ 2315 2316 if ((s = socket(here.ss_family, SOCK_STREAM, 0)) == -1) { 2317 syslog(LOG_ERR, "socket: %m"); 2318 return (result); 2319 } 2320 2321 sin = here; 2322 switch (sin.ss_family) { 2323 case AF_INET: 2324 ((struct sockaddr_in *)&sin)->sin_port = htons(0); 2325 break; 2326 #ifdef INET6 2327 case AF_INET6: 2328 ((struct sockaddr_in6 *)&sin)->sin6_port = htons(0); 2329 break; 2330 #endif 2331 } 2332 if (bind(s, (struct sockaddr *) &sin, sin.ss_len) == -1) { 2333 syslog(LOG_ERR, "bind: %m"); 2334 return (result); 2335 } 2336 2337 signal(SIGALRM, timeout); 2338 if (setjmp(timebuf)) { 2339 close(s); /* not: fclose(fp) */ 2340 return (result); 2341 } 2342 alarm(TIMEOUT); 2343 2344 /* Connect to the RFC931 daemon. */ 2345 2346 memcpy(&sin, there, there->sa_len); 2347 switch (sin.ss_family) { 2348 case AF_INET: 2349 ((struct sockaddr_in *)&sin)->sin_port = htons(RFC931_PORT); 2350 break; 2351 #ifdef INET6 2352 case AF_INET6: 2353 ((struct sockaddr_in6 *)&sin)->sin6_port = htons(RFC931_PORT); 2354 break; 2355 #endif 2356 } 2357 if (connect(s, (struct sockaddr *) &sin, sin.ss_len) == -1) { 2358 close(s); 2359 alarm(0); 2360 return (result); 2361 } 2362 2363 /* Query the RFC 931 server. Would 13-byte writes ever be broken up? */ 2364 (void)snprintf(buf, sizeof buf, "%u,%u\r\n", ntohs(hisport), 2365 ntohs(myport)); 2366 2367 for (len = 0, cp = buf; len < strlen(buf); ) { 2368 int n; 2369 2370 if ((n = write(s, cp, strlen(buf) - len)) == -1) { 2371 close(s); 2372 alarm(0); 2373 return (result); 2374 } 2375 cp += n; 2376 len += n; 2377 } 2378 2379 /* Read response */ 2380 for (cp = buf; cp < buf + sizeof(buf) - 1; ) { 2381 char c; 2382 if (read(s, &c, 1) != 1) { 2383 close(s); 2384 alarm(0); 2385 return (result); 2386 } 2387 if (c == '\n') 2388 break; 2389 *cp++ = c; 2390 } 2391 *cp = '\0'; 2392 2393 if (sscanf(buf, "%u , %u : USERID :%*[^:]:%255s", &remote, &local, 2394 user) == 3 && ntohs(hisport) == remote && ntohs(myport) == local) { 2395 /* Strip trailing carriage return. */ 2396 if ((cp = strchr(user, '\r')) != NULL) 2397 *cp = 0; 2398 result = user; 2399 } 2400 2401 alarm(0); 2402 close(s); 2403 return (result); 2404 } 2405 #endif 2406 2407 /* 2408 * check if the address/port where send data to is one of the obvious ports 2409 * that are used for denial of service attacks like two echo ports 2410 * just echoing data between them 2411 */ 2412 static int 2413 port_good_dg(struct sockaddr *sa) 2414 { 2415 struct in_addr in; 2416 #ifdef INET6 2417 struct in6_addr *in6; 2418 #endif 2419 u_int16_t port; 2420 int i, bad; 2421 char hbuf[NI_MAXHOST]; 2422 2423 bad = 0; 2424 2425 switch (sa->sa_family) { 2426 case AF_INET: 2427 in.s_addr = ntohl(((struct sockaddr_in *)sa)->sin_addr.s_addr); 2428 port = ntohs(((struct sockaddr_in *)sa)->sin_port); 2429 v4chk: 2430 if (IN_MULTICAST(in.s_addr)) 2431 goto bad; 2432 switch ((in.s_addr & 0xff000000) >> 24) { 2433 case 0: case 127: case 255: 2434 goto bad; 2435 } 2436 if (dg_broadcast(&in)) 2437 goto bad; 2438 break; 2439 #ifdef INET6 2440 case AF_INET6: 2441 in6 = &((struct sockaddr_in6 *)sa)->sin6_addr; 2442 port = ntohs(((struct sockaddr_in6 *)sa)->sin6_port); 2443 if (IN6_IS_ADDR_MULTICAST(in6) || IN6_IS_ADDR_UNSPECIFIED(in6)) 2444 goto bad; 2445 if (IN6_IS_ADDR_V4MAPPED(in6) || IN6_IS_ADDR_V4COMPAT(in6)) { 2446 memcpy(&in, &in6->s6_addr[12], sizeof(in)); 2447 in.s_addr = ntohl(in.s_addr); 2448 goto v4chk; 2449 } 2450 break; 2451 #endif 2452 default: 2453 /* XXX unsupported af, is it safe to assume it to be safe? */ 2454 return (1); 2455 } 2456 2457 for (i = 0; bad_ports[i] != 0; i++) { 2458 if (port == bad_ports[i]) 2459 goto bad; 2460 } 2461 2462 return (1); 2463 2464 bad: 2465 if (getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), NULL, 0, 2466 niflags) != 0) 2467 strlcpy(hbuf, "?", sizeof(hbuf)); 2468 syslog(LOG_WARNING,"Possible DoS attack from %s, Port %d", 2469 hbuf, port); 2470 return (0); 2471 } 2472 2473 /* XXX need optimization */ 2474 static int 2475 dg_broadcast(struct in_addr *in) 2476 { 2477 struct ifaddrs *ifa, *ifap; 2478 struct sockaddr_in *sin; 2479 2480 if (getifaddrs(&ifap) < 0) 2481 return (0); 2482 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 2483 if (ifa->ifa_addr->sa_family != AF_INET || 2484 (ifa->ifa_flags & IFF_BROADCAST) == 0) 2485 continue; 2486 sin = (struct sockaddr_in *)ifa->ifa_broadaddr; 2487 if (sin->sin_addr.s_addr == in->s_addr) { 2488 freeifaddrs(ifap); 2489 return (1); 2490 } 2491 } 2492 freeifaddrs(ifap); 2493 return (0); 2494 } 2495 2496 static int 2497 my_kevent(const struct kevent *changelist, size_t nchanges, 2498 struct kevent *eventlist, size_t nevents) 2499 { 2500 int result; 2501 2502 while ((result = kevent(kq, changelist, nchanges, eventlist, nevents, 2503 NULL)) < 0) 2504 if (errno != EINTR) { 2505 syslog(LOG_ERR, "kevent: %m"); 2506 exit(EXIT_FAILURE); 2507 } 2508 2509 return (result); 2510 } 2511 2512 static struct kevent * 2513 allocchange(void) 2514 { 2515 if (changes == A_CNT(changebuf)) { 2516 (void) my_kevent(changebuf, A_CNT(changebuf), NULL, 0); 2517 changes = 0; 2518 } 2519 2520 return (&changebuf[changes++]); 2521 } 2522
Indexes created Thu Sep 25 16:09:42 GMT 2025