1 /* $NetBSD: inetd.c,v 1.95 2004/01/25 10:00:17 cube 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 1.95 2004/01/25 10:00:17 cube Exp $"); 77 #endif 78 #endif /* not lint */ 79 80 /* 81 * Inetd - Internet super-server 82 * 83 * This program invokes all internet services as needed. Connection-oriented 84 * services are invoked each time a connection is made, by creating a process. 85 * This process is passed the connection as file descriptor 0 and is expected 86 * to do a getpeername to find out the source host and port. 87 * 88 * Datagram oriented services are invoked when a datagram 89 * arrives; a process is created and passed a pending message 90 * on file descriptor 0. Datagram servers may either connect 91 * to their peer, freeing up the original socket for inetd 92 * to receive further messages on, or ``take over the socket'', 93 * processing all arriving datagrams and, eventually, timing 94 * out. The first type of server is said to be ``multi-threaded''; 95 * the second type of server ``single-threaded''. 96 * 97 * Inetd uses a configuration file which is read at startup 98 * and, possibly, at some later time in response to a hangup signal. 99 * The configuration file is ``free format'' with fields given in the 100 * order shown below. Continuation lines for an entry must being with 101 * a space or tab. All fields must be present in each entry. 102 * 103 * service name must be in /etc/services or must 104 * name a tcpmux service 105 * socket type stream/dgram/raw/rdm/seqpacket 106 * protocol must be in /etc/protocols 107 * wait/nowait[:max] single-threaded/multi-threaded, max # 108 * user[:group] user/group to run daemon as 109 * server program full path name 110 * server program arguments maximum of MAXARGS (20) 111 * 112 * For RPC services 113 * service name/version must be in /etc/rpc 114 * socket type stream/dgram/raw/rdm/seqpacket 115 * protocol must be in /etc/protocols 116 * wait/nowait[:max] single-threaded/multi-threaded 117 * user[:group] user to run daemon as 118 * server program full path name 119 * server program arguments maximum of MAXARGS (20) 120 * 121 * For non-RPC services, the "service name" can be of the form 122 * hostaddress:servicename, in which case the hostaddress is used 123 * as the host portion of the address to listen on. If hostaddress 124 * consists of a single `*' character, INADDR_ANY is used. 125 * 126 * A line can also consist of just 127 * hostaddress: 128 * where hostaddress is as in the preceding paragraph. Such a line must 129 * have no further fields; the specified hostaddress is remembered and 130 * used for all further lines that have no hostaddress specified, 131 * until the next such line (or EOF). (This is why * is provided to 132 * allow explicit specification of INADDR_ANY.) A line 133 * *: 134 * is implicitly in effect at the beginning of the file. 135 * 136 * The hostaddress specifier may (and often will) contain dots; 137 * the service name must not. 138 * 139 * For RPC services, host-address specifiers are accepted and will 140 * work to some extent; however, because of limitations in the 141 * portmapper interface, it will not work to try to give more than 142 * one line for any given RPC service, even if the host-address 143 * specifiers are different. 144 * 145 * TCP services without official port numbers are handled with the 146 * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for 147 * requests. When a connection is made from a foreign host, the service 148 * requested is passed to tcpmux, which looks it up in the servtab list 149 * and returns the proper entry for the service. Tcpmux returns a 150 * negative reply if the service doesn't exist, otherwise the invoked 151 * server is expected to return the positive reply if the service type in 152 * inetd.conf file has the prefix "tcpmux/". If the service type has the 153 * prefix "tcpmux/+", tcpmux will return the positive reply for the 154 * process; this is for compatibility with older server code, and also 155 * allows you to invoke programs that use stdin/stdout without putting any 156 * special server code in them. Services that use tcpmux are "nowait" 157 * because they do not have a well-known port and hence cannot listen 158 * for new requests. 159 * 160 * Comment lines are indicated by a `#' in column 1. 161 * 162 * #ifdef IPSEC 163 * Comment lines that start with "#@" denote IPsec policy string, as described 164 * in ipsec_set_policy(3). This will affect all the following items in 165 * inetd.conf(8). To reset the policy, just use "#@" line. By default, 166 * there's no IPsec policy. 167 * #endif 168 */ 169 170 /* 171 * Here's the scoop concerning the user:group feature: 172 * 173 * 1) set-group-option off. 174 * 175 * a) user = root: NO setuid() or setgid() is done 176 * 177 * b) other: setuid() 178 * setgid(primary group as found in passwd) 179 * initgroups(name, primary group) 180 * 181 * 2) set-group-option on. 182 * 183 * a) user = root: NO setuid() 184 * setgid(specified group) 185 * NO initgroups() 186 * 187 * b) other: setuid() 188 * setgid(specified group) 189 * initgroups(name, specified group) 190 * 191 */ 192 193 #include <sys/param.h> 194 #include <sys/stat.h> 195 #include <sys/ioctl.h> 196 #include <sys/socket.h> 197 #include <sys/un.h> 198 #include <sys/wait.h> 199 #include <sys/time.h> 200 #include <sys/resource.h> 201 #include <sys/event.h> 202 203 #ifndef RLIMIT_NOFILE 204 #define RLIMIT_NOFILE RLIMIT_OFILE 205 #endif 206 207 #ifndef NO_RPC 208 #define RPC 209 #endif 210 211 #include <net/if.h> 212 213 #include <netinet/in.h> 214 #include <arpa/inet.h> 215 #ifdef RPC 216 #include <rpc/rpc.h> 217 #include <rpc/rpcb_clnt.h> 218 #include <netconfig.h> 219 #endif 220 221 #include <ctype.h> 222 #include <errno.h> 223 #include <fcntl.h> 224 #include <grp.h> 225 #include <netdb.h> 226 #include <pwd.h> 227 #include <signal.h> 228 #include <stdio.h> 229 #include <stdlib.h> 230 #include <string.h> 231 #include <syslog.h> 232 #include <unistd.h> 233 #include <util.h> 234 #include <ifaddrs.h> 235 236 #include "pathnames.h" 237 238 #ifdef IPSEC 239 #include <netinet6/ipsec.h> 240 #ifndef IPSEC_POLICY_IPSEC /* no ipsec support on old ipsec */ 241 #undef IPSEC 242 #endif 243 #include "ipsec.h" 244 #endif 245 246 #ifdef LIBWRAP 247 # include <tcpd.h> 248 #ifndef LIBWRAP_ALLOW_FACILITY 249 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH 250 #endif 251 #ifndef LIBWRAP_ALLOW_SEVERITY 252 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO 253 #endif 254 #ifndef LIBWRAP_DENY_FACILITY 255 # define LIBWRAP_DENY_FACILITY LOG_AUTH 256 #endif 257 #ifndef LIBWRAP_DENY_SEVERITY 258 # define LIBWRAP_DENY_SEVERITY LOG_WARNING 259 #endif 260 int allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY; 261 int deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY; 262 #endif 263 264 #define TOOMANY 40 /* don't start more than TOOMANY */ 265 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */ 266 #define RETRYTIME (60*10) /* retry after bind or server fail */ 267 268 #define A_CNT(a) (sizeof (a) / sizeof (a[0])) 269 270 int debug; 271 #ifdef LIBWRAP 272 int lflag; 273 #endif 274 int maxsock; 275 int kq; 276 int options; 277 int timingout; 278 struct servent *sp; 279 char *curdom; 280 const int niflags = NI_NUMERICHOST | NI_NUMERICSERV; 281 282 #ifndef OPEN_MAX 283 #define OPEN_MAX 64 284 #endif 285 286 /* Reserve some descriptors, 3 stdio + at least: 1 log, 1 conf. file */ 287 #define FD_MARGIN (8) 288 rlim_t rlim_ofile_cur = OPEN_MAX; 289 290 #ifdef RLIMIT_NOFILE 291 struct rlimit rlim_ofile; 292 #endif 293 294 struct kevent changebuf[64]; 295 size_t changes; 296 297 struct servtab { 298 char *se_hostaddr; /* host address to listen on */ 299 char *se_service; /* name of service */ 300 int se_socktype; /* type of socket to use */ 301 int se_family; /* address family */ 302 char *se_proto; /* protocol used */ 303 int se_sndbuf; /* sndbuf size */ 304 int se_rcvbuf; /* rcvbuf size */ 305 int se_rpcprog; /* rpc program number */ 306 int se_rpcversl; /* rpc program lowest version */ 307 int se_rpcversh; /* rpc program highest version */ 308 #define isrpcservice(sep) ((sep)->se_rpcversl != 0) 309 pid_t se_wait; /* single threaded server */ 310 short se_checked; /* looked at during merge */ 311 char *se_user; /* user name to run as */ 312 char *se_group; /* group name to run as */ 313 struct biltin *se_bi; /* if built-in, description */ 314 char *se_server; /* server program */ 315 #define MAXARGV 20 316 char *se_argv[MAXARGV+1]; /* program arguments */ 317 #ifdef IPSEC 318 char *se_policy; /* IPsec poilcy string */ 319 #endif 320 int se_fd; /* open descriptor */ 321 int se_type; /* type */ 322 union { 323 struct sockaddr se_un_ctrladdr; 324 struct sockaddr_in se_un_ctrladdr_in; 325 struct sockaddr_in6 se_un_ctrladdr_in6; 326 struct sockaddr_un se_un_ctrladdr_un; 327 } se_un; /* bound address */ 328 #define se_ctrladdr se_un.se_un_ctrladdr 329 #define se_ctrladdr_in se_un.se_un_ctrladdr_in 330 #define se_ctrladdr_un se_un.se_un_ctrladdr_un 331 int se_ctrladdr_size; 332 int se_max; /* max # of instances of this service */ 333 int se_count; /* number started since se_time */ 334 struct timeval se_time; /* start of se_count */ 335 #ifdef MULOG 336 int se_log; 337 #define MULOG_RFC931 0x40000000 338 #endif 339 struct servtab *se_next; 340 } *servtab; 341 342 #define NORM_TYPE 0 343 #define MUX_TYPE 1 344 #define MUXPLUS_TYPE 2 345 #define FAITH_TYPE 3 346 #define ISMUX(sep) (((sep)->se_type == MUX_TYPE) || \ 347 ((sep)->se_type == MUXPLUS_TYPE)) 348 #define ISMUXPLUS(sep) ((sep)->se_type == MUXPLUS_TYPE) 349 350 351 static void chargen_dg(int, struct servtab *); 352 static void chargen_stream(int, struct servtab *); 353 static void close_sep(struct servtab *); 354 static void config(void); 355 static void daytime_dg(int, struct servtab *); 356 static void daytime_stream(int, struct servtab *); 357 static void discard_dg(int, struct servtab *); 358 static void discard_stream(int, struct servtab *); 359 static void echo_dg(int, struct servtab *); 360 static void echo_stream(int, struct servtab *); 361 static void endconfig(void); 362 static struct servtab *enter(struct servtab *); 363 static void freeconfig(struct servtab *); 364 static struct servtab *getconfigent(void); 365 static void goaway(void); 366 static void machtime_dg(int, struct servtab *); 367 static void machtime_stream(int, struct servtab *); 368 static char *newstr(char *); 369 static char *nextline(FILE *); 370 static void print_service(char *, struct servtab *); 371 static void reapchild(void); 372 static void retry(void); 373 static void run_service(int, struct servtab *); 374 static int setconfig(void); 375 static void setup(struct servtab *); 376 static char *sskip(char **); 377 static char *skip(char **); 378 static void tcpmux(int, struct servtab *); 379 static void usage(void); 380 static void register_rpc(struct servtab *); 381 static void unregister_rpc(struct servtab *); 382 static void bump_nofile(void); 383 static void inetd_setproctitle(char *, int); 384 static void initring(void); 385 static uint32_t machtime(void); 386 static int port_good_dg(struct sockaddr *); 387 static int dg_broadcast(struct in_addr *); 388 static int my_kevent(const struct kevent *, size_t, struct kevent *, 389 size_t); 390 static struct kevent * allocchange(void); 391 static int getline(int, char *, int); 392 static void spawn(struct servtab *, int); 393 #ifdef MULOG 394 static void dolog(struct servtab *, int); 395 static void timeout(int); 396 static char *rfc931_name(struct sockaddr *, int); 397 #endif 398 399 struct biltin { 400 char *bi_service; /* internally provided service name */ 401 int bi_socktype; /* type of socket supported */ 402 short bi_fork; /* 1 if should fork before call */ 403 short bi_wait; /* 1 if should wait for child */ 404 void (*bi_fn)(int, struct servtab *); 405 /* function which performs it */ 406 } biltins[] = { 407 /* Echo received data */ 408 { "echo", SOCK_STREAM, 1, 0, echo_stream }, 409 { "echo", SOCK_DGRAM, 0, 0, echo_dg }, 410 411 /* Internet /dev/null */ 412 { "discard", SOCK_STREAM, 1, 0, discard_stream }, 413 { "discard", SOCK_DGRAM, 0, 0, discard_dg }, 414 415 /* Return 32 bit time since 1970 */ 416 { "time", SOCK_STREAM, 0, 0, machtime_stream }, 417 { "time", SOCK_DGRAM, 0, 0, machtime_dg }, 418 419 /* Return human-readable time */ 420 { "daytime", SOCK_STREAM, 0, 0, daytime_stream }, 421 { "daytime", SOCK_DGRAM, 0, 0, daytime_dg }, 422 423 /* Familiar character generator */ 424 { "chargen", SOCK_STREAM, 1, 0, chargen_stream }, 425 { "chargen", SOCK_DGRAM, 0, 0, chargen_dg }, 426 427 { "tcpmux", SOCK_STREAM, 1, 0, tcpmux }, 428 429 { NULL } 430 }; 431 432 /* list of "bad" ports. I.e. ports that are most obviously used for 433 * "cycling packets" denial of service attacks. See /etc/services. 434 * List must end with port number "0". 435 */ 436 437 u_int16_t bad_ports[] = { 7, 9, 13, 19, 37, 0 }; 438 439 440 #define NUMINT (sizeof(intab) / sizeof(struct inent)) 441 char *CONFIG = _PATH_INETDCONF; 442 443 static int my_signals[] = 444 { SIGALRM, SIGHUP, SIGCHLD, SIGTERM, SIGINT, SIGPIPE }; 445 446 int 447 main(int argc, char *argv[]) 448 { 449 int ch, n, reload = 1; 450 451 while ((ch = getopt(argc, argv, 452 #ifdef LIBWRAP 453 "dl" 454 #else 455 "d" 456 #endif 457 )) != -1) 458 switch(ch) { 459 case 'd': 460 debug = 1; 461 options |= SO_DEBUG; 462 break; 463 #ifdef LIBWRAP 464 case 'l': 465 lflag = 1; 466 break; 467 #endif 468 case '?': 469 default: 470 usage(); 471 } 472 argc -= optind; 473 argv += optind; 474 475 if (argc > 0) 476 CONFIG = argv[0]; 477 478 if (!debug) 479 daemon(0, 0); 480 openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON); 481 pidfile(NULL); 482 483 kq = kqueue(); 484 if (kq < 0) { 485 syslog(LOG_ERR, "kqueue: %m"); 486 return (EXIT_FAILURE); 487 } 488 489 #ifdef RLIMIT_NOFILE 490 if (getrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) { 491 syslog(LOG_ERR, "getrlimit: %m"); 492 } else { 493 rlim_ofile_cur = rlim_ofile.rlim_cur; 494 if (rlim_ofile_cur == RLIM_INFINITY) /* ! */ 495 rlim_ofile_cur = OPEN_MAX; 496 } 497 #endif 498 499 for (n = 0; n < A_CNT(my_signals); n++) { 500 int signum; 501 502 signum = my_signals[n]; 503 (void) signal(signum, SIG_IGN); 504 505 if (signum != SIGPIPE) { 506 struct kevent *ev; 507 508 ev = allocchange(); 509 EV_SET(ev, signum, EVFILT_SIGNAL, EV_ADD | EV_ENABLE, 510 0, 0, 0); 511 } 512 } 513 514 for (;;) { 515 int ctrl; 516 struct kevent eventbuf[64], *ev; 517 struct servtab *sep; 518 519 if (reload) { 520 reload = 0; 521 config(); 522 } 523 524 n = my_kevent(changebuf, changes, eventbuf, A_CNT(eventbuf)); 525 changes = 0; 526 527 for (ev = eventbuf; n > 0; ev++, n--) { 528 if (ev->filter == EVFILT_SIGNAL) { 529 switch (ev->ident) { 530 case SIGALRM: 531 retry(); 532 break; 533 case SIGCHLD: 534 reapchild(); 535 break; 536 case SIGTERM: 537 case SIGINT: 538 goaway(); 539 break; 540 case SIGHUP: 541 reload = 1; 542 break; 543 } 544 continue; 545 } 546 if (ev->filter != EVFILT_READ) 547 continue; 548 sep = (struct servtab *)ev->udata; 549 /* Paranoia */ 550 if (ev->ident != sep->se_fd) 551 continue; 552 if (debug) 553 fprintf(stderr, "someone wants %s\n", 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 char quote; 1702 1703 if (*cpp == NULL) 1704 return (NULL); 1705 1706 again: 1707 while (*cp == ' ' || *cp == '\t') 1708 cp++; 1709 if (*cp == '\0') { 1710 int c; 1711 1712 c = getc(fconfig); 1713 (void) ungetc(c, fconfig); 1714 if (c == ' ' || c == '\t') 1715 if ((cp = nextline(fconfig))) 1716 goto again; 1717 *cpp = NULL; 1718 return (NULL); 1719 } 1720 start = cp; 1721 quote = '\0'; 1722 while (*cp && (quote || (*cp != ' ' && *cp != '\t'))) { 1723 if (*cp == '\'' || *cp == '"') { 1724 if (quote && *cp != quote) 1725 cp++; 1726 else { 1727 if (quote) 1728 quote = '\0'; 1729 else 1730 quote = *cp; 1731 memmove(cp, cp+1, strlen(cp)); 1732 } 1733 } else 1734 cp++; 1735 } 1736 if (*cp != '\0') 1737 *cp++ = '\0'; 1738 *cpp = cp; 1739 return (start); 1740 } 1741 1742 static char * 1743 nextline(FILE *fd) 1744 { 1745 char *cp; 1746 1747 if (fgets(line, sizeof (line), fd) == NULL) 1748 return (NULL); 1749 cp = strchr(line, '\n'); 1750 if (cp) 1751 *cp = '\0'; 1752 return (line); 1753 } 1754 1755 static char * 1756 newstr(char *cp) 1757 { 1758 if ((cp = strdup((cp !=NULL )? cp : "")) != NULL) 1759 return (cp); 1760 syslog(LOG_ERR, "strdup: %m"); 1761 exit(1); 1762 } 1763 1764 static void 1765 inetd_setproctitle(char *a, int s) 1766 { 1767 socklen_t size; 1768 struct sockaddr_storage ss; 1769 char hbuf[NI_MAXHOST]; 1770 1771 size = sizeof(ss); 1772 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) { 1773 if (getnameinfo((struct sockaddr *)&ss, size, hbuf, 1774 sizeof(hbuf), NULL, 0, niflags) == 0) 1775 setproctitle("-%s [%s]", a, hbuf); 1776 else 1777 setproctitle("-%s [?]", a); 1778 } else 1779 setproctitle("-%s", a); 1780 } 1781 1782 static void 1783 bump_nofile(void) 1784 { 1785 #ifdef RLIMIT_NOFILE 1786 1787 #define FD_CHUNK 32 1788 1789 struct rlimit rl; 1790 1791 if (getrlimit(RLIMIT_NOFILE, &rl) < 0) { 1792 syslog(LOG_ERR, "getrlimit: %m"); 1793 return; 1794 } 1795 rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK); 1796 if (rl.rlim_cur <= rlim_ofile_cur) { 1797 syslog(LOG_ERR, 1798 "bump_nofile: cannot extend file limit, max = %d", 1799 (int)rl.rlim_cur); 1800 return; 1801 } 1802 1803 if (setrlimit(RLIMIT_NOFILE, &rl) < 0) { 1804 syslog(LOG_ERR, "setrlimit: %m"); 1805 return; 1806 } 1807 1808 rlim_ofile_cur = rl.rlim_cur; 1809 return; 1810 1811 #else 1812 syslog(LOG_ERR, "bump_nofile: cannot extend file limit"); 1813 return; 1814 #endif 1815 } 1816 1817 /* 1818 * Internet services provided internally by inetd: 1819 */ 1820 #define BUFSIZE 4096 1821 1822 /* ARGSUSED */ 1823 static void 1824 echo_stream(int s, struct servtab *sep) /* Echo service -- echo data back */ 1825 { 1826 char buffer[BUFSIZE]; 1827 int i; 1828 1829 inetd_setproctitle(sep->se_service, s); 1830 while ((i = read(s, buffer, sizeof(buffer))) > 0 && 1831 write(s, buffer, i) > 0) 1832 ; 1833 } 1834 1835 /* ARGSUSED */ 1836 static void 1837 echo_dg(int s, struct servtab *sep) /* Echo service -- echo data back */ 1838 { 1839 char buffer[BUFSIZE]; 1840 int i; 1841 socklen_t size; 1842 struct sockaddr_storage ss; 1843 struct sockaddr *sa; 1844 1845 sa = (struct sockaddr *)&ss; 1846 size = sizeof(ss); 1847 if ((i = recvfrom(s, buffer, sizeof(buffer), 0, sa, &size)) < 0) 1848 return; 1849 if (port_good_dg(sa)) 1850 (void) sendto(s, buffer, i, 0, sa, size); 1851 } 1852 1853 /* ARGSUSED */ 1854 static void 1855 discard_stream(int s, struct servtab *sep) /* Discard service -- ignore data */ 1856 { 1857 char buffer[BUFSIZE]; 1858 1859 inetd_setproctitle(sep->se_service, s); 1860 while ((errno = 0, read(s, buffer, sizeof(buffer)) > 0) || 1861 errno == EINTR) 1862 ; 1863 } 1864 1865 /* ARGSUSED */ 1866 static void 1867 discard_dg(int s, struct servtab *sep) /* Discard service -- ignore data */ 1868 1869 { 1870 char buffer[BUFSIZE]; 1871 1872 (void) read(s, buffer, sizeof(buffer)); 1873 } 1874 1875 #include <ctype.h> 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 v4chk: 2444 if (IN_MULTICAST(in.s_addr)) 2445 goto bad; 2446 switch ((in.s_addr & 0xff000000) >> 24) { 2447 case 0: case 127: case 255: 2448 goto bad; 2449 } 2450 if (dg_broadcast(&in)) 2451 goto bad; 2452 break; 2453 #ifdef INET6 2454 case AF_INET6: 2455 in6 = &((struct sockaddr_in6 *)sa)->sin6_addr; 2456 port = ntohs(((struct sockaddr_in6 *)sa)->sin6_port); 2457 if (IN6_IS_ADDR_MULTICAST(in6) || IN6_IS_ADDR_UNSPECIFIED(in6)) 2458 goto bad; 2459 if (IN6_IS_ADDR_V4MAPPED(in6) || IN6_IS_ADDR_V4COMPAT(in6)) { 2460 memcpy(&in, &in6->s6_addr[12], sizeof(in)); 2461 in.s_addr = ntohl(in.s_addr); 2462 goto v4chk; 2463 } 2464 break; 2465 #endif 2466 default: 2467 /* XXX unsupported af, is it safe to assume it to be safe? */ 2468 return (1); 2469 } 2470 2471 for (i = 0; bad_ports[i] != 0; i++) { 2472 if (port == bad_ports[i]) 2473 goto bad; 2474 } 2475 2476 return (1); 2477 2478 bad: 2479 if (getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), NULL, 0, 2480 niflags) != 0) 2481 strlcpy(hbuf, "?", sizeof(hbuf)); 2482 syslog(LOG_WARNING,"Possible DoS attack from %s, Port %d", 2483 hbuf, port); 2484 return (0); 2485 } 2486 2487 /* XXX need optimization */ 2488 static int 2489 dg_broadcast(struct in_addr *in) 2490 { 2491 struct ifaddrs *ifa, *ifap; 2492 struct sockaddr_in *sin; 2493 2494 if (getifaddrs(&ifap) < 0) 2495 return (0); 2496 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 2497 if (ifa->ifa_addr->sa_family != AF_INET || 2498 (ifa->ifa_flags & IFF_BROADCAST) == 0) 2499 continue; 2500 sin = (struct sockaddr_in *)ifa->ifa_broadaddr; 2501 if (sin->sin_addr.s_addr == in->s_addr) { 2502 freeifaddrs(ifap); 2503 return (1); 2504 } 2505 } 2506 freeifaddrs(ifap); 2507 return (0); 2508 } 2509 2510 static int 2511 my_kevent(const struct kevent *changelist, size_t nchanges, 2512 struct kevent *eventlist, size_t nevents) 2513 { 2514 int result; 2515 2516 while ((result = kevent(kq, changelist, nchanges, eventlist, nevents, 2517 NULL)) < 0) 2518 if (errno != EINTR) { 2519 syslog(LOG_ERR, "kevent: %m"); 2520 exit(EXIT_FAILURE); 2521 } 2522 2523 return (result); 2524 } 2525 2526 static struct kevent * 2527 allocchange(void) 2528 { 2529 if (changes == A_CNT(changebuf)) { 2530 (void) my_kevent(changebuf, A_CNT(changebuf), NULL, 0); 2531 changes = 0; 2532 } 2533 2534 return (&changebuf[changes++]); 2535 } 2536