inetd.c revision 1.102
1 /* $NetBSD: inetd.c,v 1.102 2007/01/02 16:00:46 rillig 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 1.102 2007/01/02 16:00:46 rillig 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 < (int)A_CNT(my_signals); n++) { 500 int signum; 501 502 signum = my_signals[n]; 503 if (signum != SIGCHLD) 504 (void) signal(signum, SIG_IGN); 505 506 if (signum != SIGPIPE) { 507 struct kevent *ev; 508 509 ev = allocchange(); 510 EV_SET(ev, signum, EVFILT_SIGNAL, EV_ADD | EV_ENABLE, 511 0, 0, 0); 512 } 513 } 514 515 for (;;) { 516 int ctrl; 517 struct kevent eventbuf[64], *ev; 518 struct servtab *sep; 519 520 if (reload) { 521 reload = 0; 522 config(); 523 } 524 525 n = my_kevent(changebuf, changes, eventbuf, A_CNT(eventbuf)); 526 changes = 0; 527 528 for (ev = eventbuf; n > 0; ev++, n--) { 529 if (ev->filter == EVFILT_SIGNAL) { 530 switch (ev->ident) { 531 case SIGALRM: 532 retry(); 533 break; 534 case SIGCHLD: 535 reapchild(); 536 break; 537 case SIGTERM: 538 case SIGINT: 539 goaway(); 540 break; 541 case SIGHUP: 542 reload = 1; 543 break; 544 } 545 continue; 546 } 547 if (ev->filter != EVFILT_READ) 548 continue; 549 sep = (struct servtab *)ev->udata; 550 /* Paranoia */ 551 if ((int)ev->ident != sep->se_fd) 552 continue; 553 if (debug) 554 fprintf(stderr, "someone wants %s\n", 555 sep->se_service); 556 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 557 /* XXX here do the libwrap check-before-accept*/ 558 ctrl = accept(sep->se_fd, NULL, NULL); 559 if (debug) 560 fprintf(stderr, "accept, ctrl %d\n", 561 ctrl); 562 if (ctrl < 0) { 563 if (errno != EINTR) 564 syslog(LOG_WARNING, 565 "accept (for %s): %m", 566 sep->se_service); 567 continue; 568 } 569 } else 570 ctrl = sep->se_fd; 571 spawn(sep, ctrl); 572 } 573 } 574 } 575 576 static void 577 spawn(struct servtab *sep, int ctrl) 578 { 579 int dofork; 580 pid_t pid; 581 582 pid = 0; 583 #ifdef LIBWRAP_INTERNAL 584 dofork = 1; 585 #else 586 dofork = (sep->se_bi == 0 || sep->se_bi->bi_fork); 587 #endif 588 if (dofork) { 589 if (sep->se_count++ == 0) 590 (void)gettimeofday(&sep->se_time, NULL); 591 else if (sep->se_count >= sep->se_max) { 592 struct timeval now; 593 594 (void)gettimeofday(&now, NULL); 595 if (now.tv_sec - sep->se_time.tv_sec > CNT_INTVL) { 596 sep->se_time = now; 597 sep->se_count = 1; 598 } else { 599 syslog(LOG_ERR, 600 "%s/%s max spawn rate (%d in %d seconds) " 601 "exceeded; service not started", 602 sep->se_service, sep->se_proto, 603 sep->se_max, CNT_INTVL); 604 if (!sep->se_wait && sep->se_socktype == 605 SOCK_STREAM) 606 close(ctrl); 607 close_sep(sep); 608 if (!timingout) { 609 timingout = 1; 610 alarm(RETRYTIME); 611 } 612 return; 613 } 614 } 615 pid = fork(); 616 if (pid < 0) { 617 syslog(LOG_ERR, "fork: %m"); 618 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 619 close(ctrl); 620 sleep(1); 621 return; 622 } 623 if (pid != 0 && sep->se_wait) { 624 struct kevent *ev; 625 626 sep->se_wait = pid; 627 ev = allocchange(); 628 EV_SET(ev, sep->se_fd, EVFILT_READ, 629 EV_DELETE, 0, 0, 0); 630 } 631 if (pid == 0) { 632 size_t n; 633 634 for (n = 0; n < A_CNT(my_signals); n++) 635 (void) signal(my_signals[n], SIG_DFL); 636 if (debug) 637 setsid(); 638 } 639 } 640 if (pid == 0) { 641 run_service(ctrl, sep); 642 if (dofork) 643 exit(0); 644 } 645 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 646 close(ctrl); 647 } 648 649 static void 650 run_service(int ctrl, struct servtab *sep) 651 { 652 struct passwd *pwd; 653 struct group *grp = NULL; /* XXX gcc */ 654 char buf[NI_MAXSERV]; 655 #ifdef LIBWRAP 656 struct request_info req; 657 int denied; 658 char *service = NULL; /* XXX gcc */ 659 #endif 660 661 #ifdef LIBWRAP 662 #ifndef LIBWRAP_INTERNAL 663 if (sep->se_bi == 0) 664 #endif 665 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 666 request_init(&req, RQ_DAEMON, sep->se_argv[0] ? 667 sep->se_argv[0] : sep->se_service, RQ_FILE, ctrl, NULL); 668 fromhost(&req); 669 denied = !hosts_access(&req); 670 if (denied || lflag) { 671 if (getnameinfo(&sep->se_ctrladdr, 672 sep->se_ctrladdr.sa_len, NULL, 0, 673 buf, sizeof(buf), 0) != 0) { 674 /* shouldn't happen */ 675 (void)snprintf(buf, sizeof buf, "%d", 676 ntohs(sep->se_ctrladdr_in.sin_port)); 677 } 678 service = buf; 679 } 680 if (denied) { 681 syslog(deny_severity, 682 "refused connection from %.500s, service %s (%s)", 683 eval_client(&req), service, sep->se_proto); 684 goto reject; 685 } 686 if (lflag) { 687 syslog(allow_severity, 688 "connection from %.500s, service %s (%s)", 689 eval_client(&req), service, sep->se_proto); 690 } 691 } 692 #endif /* LIBWRAP */ 693 694 if (sep->se_bi) { 695 (*sep->se_bi->bi_fn)(ctrl, sep); 696 } else { 697 if ((pwd = getpwnam(sep->se_user)) == NULL) { 698 syslog(LOG_ERR, "%s/%s: %s: No such user", 699 sep->se_service, sep->se_proto, sep->se_user); 700 goto reject; 701 } 702 if (sep->se_group && 703 (grp = getgrnam(sep->se_group)) == NULL) { 704 syslog(LOG_ERR, "%s/%s: %s: No such group", 705 sep->se_service, sep->se_proto, sep->se_group); 706 goto reject; 707 } 708 if (pwd->pw_uid) { 709 if (sep->se_group) 710 pwd->pw_gid = grp->gr_gid; 711 if (setgid(pwd->pw_gid) < 0) { 712 syslog(LOG_ERR, 713 "%s/%s: can't set gid %d: %m", sep->se_service, 714 sep->se_proto, pwd->pw_gid); 715 goto reject; 716 } 717 (void) initgroups(pwd->pw_name, 718 pwd->pw_gid); 719 if (setuid(pwd->pw_uid) < 0) { 720 syslog(LOG_ERR, 721 "%s/%s: can't set uid %d: %m", sep->se_service, 722 sep->se_proto, pwd->pw_uid); 723 goto reject; 724 } 725 } else if (sep->se_group) { 726 (void) setgid((gid_t)grp->gr_gid); 727 } 728 if (debug) 729 fprintf(stderr, "%d execl %s\n", 730 getpid(), sep->se_server); 731 #ifdef MULOG 732 if (sep->se_log) 733 dolog(sep, ctrl); 734 #endif 735 /* Set our control descriptor to not close-on-exec... */ 736 if (fcntl(ctrl, F_SETFD, 0) < 0) 737 syslog(LOG_ERR, "fcntl (F_SETFD, 0): %m"); 738 /* ...and dup it to stdin, stdout, and stderr. */ 739 if (ctrl != 0) { 740 dup2(ctrl, 0); 741 close(ctrl); 742 ctrl = 0; 743 } 744 dup2(0, 1); 745 dup2(0, 2); 746 #ifdef RLIMIT_NOFILE 747 if (rlim_ofile.rlim_cur != rlim_ofile_cur && 748 setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) 749 syslog(LOG_ERR, "setrlimit: %m"); 750 #endif 751 execv(sep->se_server, sep->se_argv); 752 syslog(LOG_ERR, "cannot execute %s: %m", sep->se_server); 753 reject: 754 if (sep->se_socktype != SOCK_STREAM) 755 recv(ctrl, buf, sizeof (buf), 0); 756 _exit(1); 757 } 758 } 759 760 static void 761 reapchild(void) 762 { 763 int status; 764 pid_t pid; 765 struct servtab *sep; 766 767 for (;;) { 768 pid = wait3(&status, WNOHANG, NULL); 769 if (pid <= 0) 770 break; 771 if (debug) 772 (void) fprintf(stderr, "%d reaped, status %#x\n", 773 pid, status); 774 for (sep = servtab; sep != NULL; sep = sep->se_next) 775 if (sep->se_wait == pid) { 776 struct kevent *ev; 777 778 if (WIFEXITED(status) && WEXITSTATUS(status)) 779 syslog(LOG_WARNING, 780 "%s: exit status 0x%x", 781 sep->se_server, WEXITSTATUS(status)); 782 else if (WIFSIGNALED(status)) 783 syslog(LOG_WARNING, 784 "%s: exit signal 0x%x", 785 sep->se_server, WTERMSIG(status)); 786 sep->se_wait = 1; 787 ev = allocchange(); 788 EV_SET(ev, sep->se_fd, EVFILT_READ, 789 EV_ADD | EV_ENABLE, 0, 0, (intptr_t)sep); 790 if (debug) 791 fprintf(stderr, "restored %s, fd %d\n", 792 sep->se_service, sep->se_fd); 793 } 794 } 795 } 796 797 static void 798 config(void) 799 { 800 struct servtab *sep, *cp, **sepp; 801 size_t n; 802 803 if (!setconfig()) { 804 syslog(LOG_ERR, "%s: %m", CONFIG); 805 return; 806 } 807 for (sep = servtab; sep != NULL; sep = sep->se_next) 808 sep->se_checked = 0; 809 while ((cp = getconfigent())) { 810 for (sep = servtab; sep != NULL; sep = sep->se_next) 811 if (strcmp(sep->se_service, cp->se_service) == 0 && 812 strcmp(sep->se_hostaddr, cp->se_hostaddr) == 0 && 813 strcmp(sep->se_proto, cp->se_proto) == 0 && 814 ISMUX(sep) == ISMUX(cp)) 815 break; 816 if (sep != NULL) { 817 int i; 818 819 #define SWAP(type, a, b) {type c = a; a = b; b = c;} 820 821 /* 822 * sep->se_wait may be holding the pid of a daemon 823 * that we're waiting for. If so, don't overwrite 824 * it unless the config file explicitly says don't 825 * wait. 826 */ 827 if (cp->se_bi == 0 && 828 (sep->se_wait == 1 || cp->se_wait == 0)) 829 sep->se_wait = cp->se_wait; 830 SWAP(char *, sep->se_user, cp->se_user); 831 SWAP(char *, sep->se_group, cp->se_group); 832 SWAP(char *, sep->se_server, cp->se_server); 833 for (i = 0; i < MAXARGV; i++) 834 SWAP(char *, sep->se_argv[i], cp->se_argv[i]); 835 #ifdef IPSEC 836 SWAP(char *, sep->se_policy, cp->se_policy); 837 #endif 838 SWAP(int, cp->se_type, sep->se_type); 839 SWAP(int, cp->se_max, sep->se_max); 840 #undef SWAP 841 if (isrpcservice(sep)) 842 unregister_rpc(sep); 843 sep->se_rpcversl = cp->se_rpcversl; 844 sep->se_rpcversh = cp->se_rpcversh; 845 freeconfig(cp); 846 if (debug) 847 print_service("REDO", sep); 848 } else { 849 sep = enter(cp); 850 if (debug) 851 print_service("ADD ", sep); 852 } 853 sep->se_checked = 1; 854 855 switch (sep->se_family) { 856 case AF_LOCAL: 857 if (sep->se_fd != -1) 858 break; 859 n = strlen(sep->se_service); 860 if (n > sizeof(sep->se_ctrladdr_un.sun_path)) { 861 syslog(LOG_ERR, "%s: address too long", 862 sep->se_service); 863 sep->se_checked = 0; 864 continue; 865 } 866 (void)unlink(sep->se_service); 867 strncpy(sep->se_ctrladdr_un.sun_path, 868 sep->se_service, n); 869 sep->se_ctrladdr_un.sun_family = AF_LOCAL; 870 sep->se_ctrladdr_size = n + 871 sizeof(sep->se_ctrladdr_un) - 872 sizeof(sep->se_ctrladdr_un.sun_path); 873 if (!ISMUX(sep)) 874 setup(sep); 875 break; 876 case AF_INET: 877 #ifdef INET6 878 case AF_INET6: 879 #endif 880 { 881 struct addrinfo hints, *res; 882 char *host, *port; 883 int error; 884 int s; 885 886 /* check if the family is supported */ 887 s = socket(sep->se_family, SOCK_DGRAM, 0); 888 if (s < 0) { 889 syslog(LOG_WARNING, 890 "%s/%s: %s: the address family is not " 891 "supported by the kernel", 892 sep->se_service, sep->se_proto, 893 sep->se_hostaddr); 894 sep->se_checked = 0; 895 continue; 896 } 897 close(s); 898 899 memset(&hints, 0, sizeof(hints)); 900 hints.ai_family = sep->se_family; 901 hints.ai_socktype = sep->se_socktype; 902 hints.ai_flags = AI_PASSIVE; 903 if (!strcmp(sep->se_hostaddr, "*")) 904 host = NULL; 905 else 906 host = sep->se_hostaddr; 907 if (isrpcservice(sep) || ISMUX(sep)) 908 port = "0"; 909 else 910 port = sep->se_service; 911 error = getaddrinfo(host, port, &hints, &res); 912 if (error) { 913 if (error == EAI_SERVICE) { 914 /* gai_strerror not friendly enough */ 915 syslog(LOG_WARNING, "%s/%s: " 916 "unknown service", 917 sep->se_service, sep->se_proto); 918 } else { 919 syslog(LOG_ERR, "%s/%s: %s: %s", 920 sep->se_service, sep->se_proto, 921 sep->se_hostaddr, 922 gai_strerror(error)); 923 } 924 sep->se_checked = 0; 925 continue; 926 } 927 if (res->ai_next) { 928 syslog(LOG_ERR, 929 "%s/%s: %s: resolved to multiple addr", 930 sep->se_service, sep->se_proto, 931 sep->se_hostaddr); 932 sep->se_checked = 0; 933 freeaddrinfo(res); 934 continue; 935 } 936 memcpy(&sep->se_ctrladdr, res->ai_addr, 937 res->ai_addrlen); 938 if (ISMUX(sep)) { 939 sep->se_fd = -1; 940 freeaddrinfo(res); 941 continue; 942 } 943 sep->se_ctrladdr_size = res->ai_addrlen; 944 freeaddrinfo(res); 945 #ifdef RPC 946 if (isrpcservice(sep)) { 947 struct rpcent *rp; 948 949 sep->se_rpcprog = atoi(sep->se_service); 950 if (sep->se_rpcprog == 0) { 951 rp = getrpcbyname(sep->se_service); 952 if (rp == 0) { 953 syslog(LOG_ERR, 954 "%s/%s: unknown service", 955 sep->se_service, 956 sep->se_proto); 957 sep->se_checked = 0; 958 continue; 959 } 960 sep->se_rpcprog = rp->r_number; 961 } 962 if (sep->se_fd == -1 && !ISMUX(sep)) 963 setup(sep); 964 if (sep->se_fd != -1) 965 register_rpc(sep); 966 } else 967 #endif 968 { 969 if (sep->se_fd >= 0) 970 close_sep(sep); 971 if (sep->se_fd == -1 && !ISMUX(sep)) 972 setup(sep); 973 } 974 } 975 } 976 } 977 endconfig(); 978 /* 979 * Purge anything not looked at above. 980 */ 981 sepp = &servtab; 982 while ((sep = *sepp)) { 983 if (sep->se_checked) { 984 sepp = &sep->se_next; 985 continue; 986 } 987 *sepp = sep->se_next; 988 if (sep->se_fd >= 0) 989 close_sep(sep); 990 if (isrpcservice(sep)) 991 unregister_rpc(sep); 992 if (sep->se_family == AF_LOCAL) 993 (void)unlink(sep->se_service); 994 if (debug) 995 print_service("FREE", sep); 996 freeconfig(sep); 997 free(sep); 998 } 999 } 1000 1001 static void 1002 retry(void) 1003 { 1004 struct servtab *sep; 1005 1006 timingout = 0; 1007 for (sep = servtab; sep != NULL; sep = sep->se_next) { 1008 if (sep->se_fd == -1 && !ISMUX(sep)) { 1009 switch (sep->se_family) { 1010 case AF_LOCAL: 1011 case AF_INET: 1012 #ifdef INET6 1013 case AF_INET6: 1014 #endif 1015 setup(sep); 1016 if (sep->se_fd != -1 && isrpcservice(sep)) 1017 register_rpc(sep); 1018 break; 1019 } 1020 } 1021 } 1022 } 1023 1024 static void 1025 goaway(void) 1026 { 1027 struct servtab *sep; 1028 1029 for (sep = servtab; sep != NULL; sep = sep->se_next) { 1030 if (sep->se_fd == -1) 1031 continue; 1032 1033 switch (sep->se_family) { 1034 case AF_LOCAL: 1035 (void)unlink(sep->se_service); 1036 break; 1037 case AF_INET: 1038 #ifdef INET6 1039 case AF_INET6: 1040 #endif 1041 if (sep->se_wait == 1 && isrpcservice(sep)) 1042 unregister_rpc(sep); 1043 break; 1044 } 1045 (void)close(sep->se_fd); 1046 } 1047 exit(0); 1048 } 1049 1050 static void 1051 setup(struct servtab *sep) 1052 { 1053 int on = 1; 1054 #ifdef INET6 1055 int off = 0; 1056 #endif 1057 struct kevent *ev; 1058 1059 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) { 1060 if (debug) 1061 fprintf(stderr, "socket failed on %s/%s: %s\n", 1062 sep->se_service, sep->se_proto, strerror(errno)); 1063 syslog(LOG_ERR, "%s/%s: socket: %m", 1064 sep->se_service, sep->se_proto); 1065 return; 1066 } 1067 /* Set all listening sockets to close-on-exec. */ 1068 if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) { 1069 syslog(LOG_ERR, "%s/%s: fcntl(F_SETFD, FD_CLOEXEC): %m", 1070 sep->se_service, sep->se_proto); 1071 close(sep->se_fd); 1072 return; 1073 } 1074 1075 #define turnon(fd, opt) \ 1076 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 1077 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 1078 turnon(sep->se_fd, SO_DEBUG) < 0) 1079 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 1080 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 1081 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 1082 #undef turnon 1083 1084 /* Set the socket buffer sizes, if specified. */ 1085 if (sep->se_sndbuf != 0 && setsockopt(sep->se_fd, SOL_SOCKET, 1086 SO_SNDBUF, (char *)&sep->se_sndbuf, sizeof(sep->se_sndbuf)) < 0) 1087 syslog(LOG_ERR, "setsockopt (SO_SNDBUF %d): %m", 1088 sep->se_sndbuf); 1089 if (sep->se_rcvbuf != 0 && setsockopt(sep->se_fd, SOL_SOCKET, 1090 SO_RCVBUF, (char *)&sep->se_rcvbuf, sizeof(sep->se_rcvbuf)) < 0) 1091 syslog(LOG_ERR, "setsockopt (SO_RCVBUF %d): %m", 1092 sep->se_rcvbuf); 1093 #ifdef INET6 1094 if (sep->se_family == AF_INET6) { 1095 int *v; 1096 v = (sep->se_type == FAITH_TYPE) ? &on : &off; 1097 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_FAITH, 1098 (char *)v, sizeof(*v)) < 0) 1099 syslog(LOG_ERR, "setsockopt (IPV6_FAITH): %m"); 1100 } 1101 #endif 1102 #ifdef IPSEC 1103 if (ipsecsetup(sep->se_family, sep->se_fd, sep->se_policy) < 0 && 1104 sep->se_policy) { 1105 syslog(LOG_ERR, "%s/%s: ipsec setup failed", 1106 sep->se_service, sep->se_proto); 1107 (void)close(sep->se_fd); 1108 sep->se_fd = -1; 1109 return; 1110 } 1111 #endif 1112 1113 if (bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size) < 0) { 1114 if (debug) 1115 fprintf(stderr, "bind failed on %s/%s: %s\n", 1116 sep->se_service, sep->se_proto, strerror(errno)); 1117 syslog(LOG_ERR, "%s/%s: bind: %m", 1118 sep->se_service, sep->se_proto); 1119 (void) close(sep->se_fd); 1120 sep->se_fd = -1; 1121 if (!timingout) { 1122 timingout = 1; 1123 alarm(RETRYTIME); 1124 } 1125 return; 1126 } 1127 if (sep->se_socktype == SOCK_STREAM) 1128 listen(sep->se_fd, 10); 1129 1130 ev = allocchange(); 1131 EV_SET(ev, sep->se_fd, EVFILT_READ, EV_ADD | EV_ENABLE, 0, 0, 1132 (intptr_t)sep); 1133 if (sep->se_fd > maxsock) { 1134 maxsock = sep->se_fd; 1135 if (maxsock > rlim_ofile_cur - FD_MARGIN) 1136 bump_nofile(); 1137 } 1138 if (debug) 1139 fprintf(stderr, "registered %s on %d\n", 1140 sep->se_server, sep->se_fd); 1141 } 1142 1143 /* 1144 * Finish with a service and its socket. 1145 */ 1146 static void 1147 close_sep(struct servtab *sep) 1148 { 1149 if (sep->se_fd >= 0) { 1150 (void) close(sep->se_fd); 1151 sep->se_fd = -1; 1152 } 1153 sep->se_count = 0; 1154 } 1155 1156 static void 1157 register_rpc(struct servtab *sep) 1158 { 1159 #ifdef RPC 1160 struct netbuf nbuf; 1161 struct sockaddr_storage ss; 1162 struct netconfig *nconf; 1163 socklen_t socklen; 1164 int n; 1165 1166 if ((nconf = getnetconfigent(sep->se_proto+4)) == NULL) { 1167 syslog(LOG_ERR, "%s: getnetconfigent failed", 1168 sep->se_proto); 1169 return; 1170 } 1171 socklen = sizeof ss; 1172 if (getsockname(sep->se_fd, (struct sockaddr *)&ss, &socklen) < 0) { 1173 syslog(LOG_ERR, "%s/%s: getsockname: %m", 1174 sep->se_service, sep->se_proto); 1175 return; 1176 } 1177 1178 nbuf.buf = &ss; 1179 nbuf.len = ss.ss_len; 1180 nbuf.maxlen = sizeof (struct sockaddr_storage); 1181 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1182 if (debug) 1183 fprintf(stderr, "rpcb_set: %u %d %s %s\n", 1184 sep->se_rpcprog, n, nconf->nc_netid, 1185 taddr2uaddr(nconf, &nbuf)); 1186 (void)rpcb_unset(sep->se_rpcprog, n, nconf); 1187 if (!rpcb_set(sep->se_rpcprog, n, nconf, &nbuf)) 1188 syslog(LOG_ERR, "rpcb_set: %u %d %s %s%s", 1189 sep->se_rpcprog, n, nconf->nc_netid, 1190 taddr2uaddr(nconf, &nbuf), clnt_spcreateerror("")); 1191 } 1192 #endif /* RPC */ 1193 } 1194 1195 static void 1196 unregister_rpc(struct servtab *sep) 1197 { 1198 #ifdef RPC 1199 int n; 1200 struct netconfig *nconf; 1201 1202 if ((nconf = getnetconfigent(sep->se_proto+4)) == NULL) { 1203 syslog(LOG_ERR, "%s: getnetconfigent failed", 1204 sep->se_proto); 1205 return; 1206 } 1207 1208 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1209 if (debug) 1210 fprintf(stderr, "rpcb_unset(%u, %d, %s)\n", 1211 sep->se_rpcprog, n, nconf->nc_netid); 1212 if (!rpcb_unset(sep->se_rpcprog, n, nconf)) 1213 syslog(LOG_ERR, "rpcb_unset(%u, %d, %s) failed\n", 1214 sep->se_rpcprog, n, nconf->nc_netid); 1215 } 1216 #endif /* RPC */ 1217 } 1218 1219 1220 static struct servtab * 1221 enter(struct servtab *cp) 1222 { 1223 struct servtab *sep; 1224 1225 sep = (struct servtab *)malloc(sizeof (*sep)); 1226 if (sep == NULL) { 1227 syslog(LOG_ERR, "Out of memory."); 1228 exit(1); 1229 } 1230 *sep = *cp; 1231 sep->se_fd = -1; 1232 sep->se_rpcprog = -1; 1233 sep->se_next = servtab; 1234 servtab = sep; 1235 return (sep); 1236 } 1237 1238 FILE *fconfig = NULL; 1239 struct servtab serv; 1240 char line[LINE_MAX]; 1241 char *defhost; 1242 #ifdef IPSEC 1243 static char *policy = NULL; 1244 #endif 1245 1246 static int 1247 setconfig(void) 1248 { 1249 if (defhost) 1250 free(defhost); 1251 defhost = newstr("*"); 1252 #ifdef IPSEC 1253 if (policy) 1254 free(policy); 1255 policy = NULL; 1256 #endif 1257 if (fconfig != NULL) { 1258 fseek(fconfig, 0L, SEEK_SET); 1259 return (1); 1260 } 1261 fconfig = fopen(CONFIG, "r"); 1262 return (fconfig != NULL); 1263 } 1264 1265 static void 1266 endconfig(void) 1267 { 1268 if (fconfig != NULL) { 1269 (void) fclose(fconfig); 1270 fconfig = NULL; 1271 } 1272 if (defhost != NULL) { 1273 free(defhost); 1274 defhost = NULL; 1275 } 1276 } 1277 1278 static struct servtab * 1279 getconfigent(void) 1280 { 1281 struct servtab *sep = &serv; 1282 int argc, val; 1283 char *cp, *cp0, *arg, *buf0, *buf1, *sz0, *sz1; 1284 static char TCPMUX_TOKEN[] = "tcpmux/"; 1285 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) 1286 char *hostdelim; 1287 1288 more: 1289 while ((cp = nextline(fconfig))) { 1290 #ifdef IPSEC 1291 /* lines starting with #@ is not a comment, but the policy */ 1292 if (cp[0] == '#' && cp[1] == '@') { 1293 char *p; 1294 for (p = cp + 2; p && *p && isspace((unsigned char)*p); p++) 1295 ; 1296 if (*p == '\0') { 1297 if (policy) 1298 free(policy); 1299 policy = NULL; 1300 } else { 1301 if (ipsecsetup_test(p) < 0) { 1302 syslog(LOG_ERR, 1303 "%s: invalid ipsec policy \"%s\"", 1304 CONFIG, p); 1305 exit(1); 1306 } else { 1307 if (policy) 1308 free(policy); 1309 policy = newstr(p); 1310 } 1311 } 1312 } 1313 #endif 1314 if (*cp == '#' || *cp == '\0') 1315 continue; 1316 #ifdef MULOG 1317 /* Avoid use of `skip' if there is a danger of it looking 1318 * at continuation lines. 1319 */ 1320 do { 1321 cp++; 1322 } while (*cp == ' ' || *cp == '\t'); 1323 if (*cp == '\0') 1324 continue; 1325 if ((arg = skip(&cp)) == NULL) 1326 continue; 1327 if (strcmp(arg, "DOMAIN")) 1328 continue; 1329 if (curdom) 1330 free(curdom); 1331 curdom = NULL; 1332 while (*cp == ' ' || *cp == '\t') 1333 cp++; 1334 if (*cp == '\0') 1335 continue; 1336 arg = cp; 1337 while (*cp && *cp != ' ' && *cp != '\t') 1338 cp++; 1339 if (*cp != '\0') 1340 *cp++ = '\0'; 1341 curdom = newstr(arg); 1342 #endif 1343 break; 1344 } 1345 if (cp == NULL) 1346 return (NULL); 1347 /* 1348 * clear the static buffer, since some fields (se_ctrladdr, 1349 * for example) don't get initialized here. 1350 */ 1351 memset((caddr_t)sep, 0, sizeof *sep); 1352 arg = skip(&cp); 1353 if (cp == NULL) { 1354 /* got an empty line containing just blanks/tabs. */ 1355 goto more; 1356 } 1357 /* Check for a host name. */ 1358 hostdelim = strrchr(arg, ':'); 1359 if (hostdelim) { 1360 *hostdelim = '\0'; 1361 if (arg[0] == '[' && hostdelim > arg && hostdelim[-1] == ']') { 1362 hostdelim[-1] = '\0'; 1363 sep->se_hostaddr = newstr(arg + 1); 1364 } else 1365 sep->se_hostaddr = newstr(arg); 1366 arg = hostdelim + 1; 1367 /* 1368 * If the line is of the form `host:', then just change the 1369 * default host for the following lines. 1370 */ 1371 if (*arg == '\0') { 1372 arg = skip(&cp); 1373 if (cp == NULL) { 1374 free(defhost); 1375 defhost = sep->se_hostaddr; 1376 goto more; 1377 } 1378 } 1379 } else 1380 sep->se_hostaddr = newstr(defhost); 1381 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1382 char *c = arg + MUX_LEN; 1383 if (*c == '+') { 1384 sep->se_type = MUXPLUS_TYPE; 1385 c++; 1386 } else 1387 sep->se_type = MUX_TYPE; 1388 sep->se_service = newstr(c); 1389 } else { 1390 sep->se_service = newstr(arg); 1391 sep->se_type = NORM_TYPE; 1392 } 1393 1394 arg = sskip(&cp); 1395 if (strcmp(arg, "stream") == 0) 1396 sep->se_socktype = SOCK_STREAM; 1397 else if (strcmp(arg, "dgram") == 0) 1398 sep->se_socktype = SOCK_DGRAM; 1399 else if (strcmp(arg, "rdm") == 0) 1400 sep->se_socktype = SOCK_RDM; 1401 else if (strcmp(arg, "seqpacket") == 0) 1402 sep->se_socktype = SOCK_SEQPACKET; 1403 else if (strcmp(arg, "raw") == 0) 1404 sep->se_socktype = SOCK_RAW; 1405 else 1406 sep->se_socktype = -1; 1407 1408 arg = sskip(&cp); 1409 if (sep->se_type == NORM_TYPE && 1410 strncmp(arg, "faith/", strlen("faith/")) == 0) { 1411 arg += strlen("faith/"); 1412 sep->se_type = FAITH_TYPE; 1413 } 1414 sep->se_proto = newstr(arg); 1415 1416 #define MALFORMED(arg) \ 1417 do { \ 1418 syslog(LOG_ERR, "%s: malformed buffer size option `%s'", \ 1419 sep->se_service, (arg)); \ 1420 goto more; \ 1421 } while (0) 1422 1423 #define GETVAL(arg) \ 1424 do { \ 1425 if (!isdigit((unsigned char)*(arg))) \ 1426 MALFORMED(arg); \ 1427 val = strtol((arg), &cp0, 10); \ 1428 if (cp0 != NULL) { \ 1429 if (cp0[1] != '\0') \ 1430 MALFORMED((arg)); \ 1431 if (cp0[0] == 'k') \ 1432 val *= 1024; \ 1433 if (cp0[0] == 'm') \ 1434 val *= 1024 * 1024; \ 1435 } \ 1436 if (val < 1) { \ 1437 syslog(LOG_ERR, "%s: invalid buffer size `%s'", \ 1438 sep->se_service, (arg)); \ 1439 goto more; \ 1440 } \ 1441 } while (0) 1442 1443 #define ASSIGN(arg) \ 1444 do { \ 1445 if (strcmp((arg), "sndbuf") == 0) \ 1446 sep->se_sndbuf = val; \ 1447 else if (strcmp((arg), "rcvbuf") == 0) \ 1448 sep->se_rcvbuf = val; \ 1449 else \ 1450 MALFORMED((arg)); \ 1451 } while (0) 1452 1453 /* 1454 * Extract the send and receive buffer sizes before parsing 1455 * the protocol. 1456 */ 1457 sep->se_sndbuf = sep->se_rcvbuf = 0; 1458 buf0 = buf1 = sz0 = sz1 = NULL; 1459 if ((buf0 = strchr(sep->se_proto, ',')) != NULL) { 1460 /* Not meaningful for Tcpmux services. */ 1461 if (ISMUX(sep)) { 1462 syslog(LOG_ERR, "%s: can't specify buffer sizes for " 1463 "tcpmux services", sep->se_service); 1464 goto more; 1465 } 1466 1467 /* Skip the , */ 1468 *buf0++ = '\0'; 1469 1470 /* Check to see if another socket buffer size was specified. */ 1471 if ((buf1 = strchr(buf0, ',')) != NULL) { 1472 /* Skip the , */ 1473 *buf1++ = '\0'; 1474 1475 /* Make sure a 3rd one wasn't specified. */ 1476 if (strchr(buf1, ',') != NULL) { 1477 syslog(LOG_ERR, "%s: too many buffer sizes", 1478 sep->se_service); 1479 goto more; 1480 } 1481 1482 /* Locate the size. */ 1483 if ((sz1 = strchr(buf1, '=')) == NULL) 1484 MALFORMED(buf1); 1485 1486 /* Skip the = */ 1487 *sz1++ = '\0'; 1488 } 1489 1490 /* Locate the size. */ 1491 if ((sz0 = strchr(buf0, '=')) == NULL) 1492 MALFORMED(buf0); 1493 1494 /* Skip the = */ 1495 *sz0++ = '\0'; 1496 1497 GETVAL(sz0); 1498 ASSIGN(buf0); 1499 1500 if (buf1 != NULL) { 1501 GETVAL(sz1); 1502 ASSIGN(buf1); 1503 } 1504 } 1505 1506 #undef ASSIGN 1507 #undef GETVAL 1508 #undef MALFORMED 1509 1510 if (strcmp(sep->se_proto, "unix") == 0) { 1511 sep->se_family = AF_LOCAL; 1512 } else { 1513 val = strlen(sep->se_proto); 1514 if (!val) { 1515 syslog(LOG_ERR, "%s: invalid protocol specified", 1516 sep->se_service); 1517 goto more; 1518 } 1519 val = sep->se_proto[val - 1]; 1520 switch (val) { 1521 case '4': /*tcp4 or udp4*/ 1522 sep->se_family = AF_INET; 1523 break; 1524 #ifdef INET6 1525 case '6': /*tcp6 or udp6*/ 1526 sep->se_family = AF_INET6; 1527 break; 1528 #endif 1529 default: 1530 sep->se_family = AF_INET; /*will become AF_INET6*/ 1531 break; 1532 } 1533 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1534 #ifdef RPC 1535 char *cp, *ccp; 1536 cp = strchr(sep->se_service, '/'); 1537 if (cp == 0) { 1538 syslog(LOG_ERR, "%s: no rpc version", 1539 sep->se_service); 1540 goto more; 1541 } 1542 *cp++ = '\0'; 1543 sep->se_rpcversl = sep->se_rpcversh = 1544 strtol(cp, &ccp, 0); 1545 if (ccp == cp) { 1546 badafterall: 1547 syslog(LOG_ERR, "%s/%s: bad rpc version", 1548 sep->se_service, cp); 1549 goto more; 1550 } 1551 if (*ccp == '-') { 1552 cp = ccp + 1; 1553 sep->se_rpcversh = strtol(cp, &ccp, 0); 1554 if (ccp == cp) 1555 goto badafterall; 1556 } 1557 #else 1558 syslog(LOG_ERR, "%s: rpc services not suported", 1559 sep->se_service); 1560 goto more; 1561 #endif /* RPC */ 1562 } 1563 } 1564 arg = sskip(&cp); 1565 { 1566 char *cp; 1567 if ((cp = strchr(arg, ':')) == NULL) 1568 cp = strchr(arg, '.'); 1569 if (cp != NULL) { 1570 *cp++ = '\0'; 1571 sep->se_max = atoi(cp); 1572 } else 1573 sep->se_max = TOOMANY; 1574 } 1575 sep->se_wait = strcmp(arg, "wait") == 0; 1576 if (ISMUX(sep)) { 1577 /* 1578 * Silently enforce "nowait" for TCPMUX services since 1579 * they don't have an assigned port to listen on. 1580 */ 1581 sep->se_wait = 0; 1582 1583 if (strncmp(sep->se_proto, "tcp", 3)) { 1584 syslog(LOG_ERR, 1585 "%s: bad protocol for tcpmux service %s", 1586 CONFIG, sep->se_service); 1587 goto more; 1588 } 1589 if (sep->se_socktype != SOCK_STREAM) { 1590 syslog(LOG_ERR, 1591 "%s: bad socket type for tcpmux service %s", 1592 CONFIG, sep->se_service); 1593 goto more; 1594 } 1595 } 1596 sep->se_user = newstr(sskip(&cp)); 1597 if ((sep->se_group = strchr(sep->se_user, ':')) != NULL) 1598 *sep->se_group++ = '\0'; 1599 else if ((sep->se_group = strchr(sep->se_user, '.')) != NULL) 1600 *sep->se_group++ = '\0'; 1601 1602 sep->se_server = newstr(sskip(&cp)); 1603 if (strcmp(sep->se_server, "internal") == 0) { 1604 struct biltin *bi; 1605 1606 for (bi = biltins; bi->bi_service; bi++) 1607 if (bi->bi_socktype == sep->se_socktype && 1608 strcmp(bi->bi_service, sep->se_service) == 0) 1609 break; 1610 if (bi->bi_service == 0) { 1611 syslog(LOG_ERR, "internal service %s unknown", 1612 sep->se_service); 1613 goto more; 1614 } 1615 sep->se_bi = bi; 1616 sep->se_wait = bi->bi_wait; 1617 } else 1618 sep->se_bi = NULL; 1619 argc = 0; 1620 for (arg = skip(&cp); cp; arg = skip(&cp)) { 1621 #if MULOG 1622 char *colon; 1623 1624 if (argc == 0 && (colon = strrchr(arg, ':'))) { 1625 while (arg < colon) { 1626 int x; 1627 char *ccp; 1628 1629 switch (*arg++) { 1630 case 'l': 1631 x = 1; 1632 if (isdigit(*arg)) { 1633 x = strtol(arg, &ccp, 0); 1634 if (ccp == arg) 1635 break; 1636 arg = ccp; 1637 } 1638 sep->se_log &= ~MULOG_RFC931; 1639 sep->se_log |= x; 1640 break; 1641 case 'a': 1642 sep->se_log |= MULOG_RFC931; 1643 break; 1644 default: 1645 break; 1646 } 1647 } 1648 arg = colon + 1; 1649 } 1650 #endif 1651 if (argc < MAXARGV) 1652 sep->se_argv[argc++] = newstr(arg); 1653 } 1654 while (argc <= MAXARGV) 1655 sep->se_argv[argc++] = NULL; 1656 #ifdef IPSEC 1657 sep->se_policy = policy ? newstr(policy) : NULL; 1658 #endif 1659 return (sep); 1660 } 1661 1662 static void 1663 freeconfig(struct servtab *cp) 1664 { 1665 int i; 1666 1667 if (cp->se_hostaddr) 1668 free(cp->se_hostaddr); 1669 if (cp->se_service) 1670 free(cp->se_service); 1671 if (cp->se_proto) 1672 free(cp->se_proto); 1673 if (cp->se_user) 1674 free(cp->se_user); 1675 /* Note: se_group is part of the newstr'ed se_user */ 1676 if (cp->se_server) 1677 free(cp->se_server); 1678 for (i = 0; i < MAXARGV; i++) 1679 if (cp->se_argv[i]) 1680 free(cp->se_argv[i]); 1681 #ifdef IPSEC 1682 if (cp->se_policy) 1683 free(cp->se_policy); 1684 #endif 1685 } 1686 1687 1688 /* 1689 * Safe skip - if skip returns null, log a syntax error in the 1690 * configuration file and exit. 1691 */ 1692 static char * 1693 sskip(char **cpp) 1694 { 1695 char *cp; 1696 1697 cp = skip(cpp); 1698 if (cp == NULL) { 1699 syslog(LOG_ERR, "%s: syntax error", CONFIG); 1700 exit(1); 1701 } 1702 return (cp); 1703 } 1704 1705 static char * 1706 skip(char **cpp) 1707 { 1708 char *cp = *cpp; 1709 char *start; 1710 char quote; 1711 1712 if (*cpp == NULL) 1713 return (NULL); 1714 1715 again: 1716 while (*cp == ' ' || *cp == '\t') 1717 cp++; 1718 if (*cp == '\0') { 1719 int c; 1720 1721 c = getc(fconfig); 1722 (void) ungetc(c, fconfig); 1723 if (c == ' ' || c == '\t') 1724 if ((cp = nextline(fconfig))) 1725 goto again; 1726 *cpp = NULL; 1727 return (NULL); 1728 } 1729 start = cp; 1730 quote = '\0'; 1731 while (*cp && (quote || (*cp != ' ' && *cp != '\t'))) { 1732 if (*cp == '\'' || *cp == '"') { 1733 if (quote && *cp != quote) 1734 cp++; 1735 else { 1736 if (quote) 1737 quote = '\0'; 1738 else 1739 quote = *cp; 1740 memmove(cp, cp+1, strlen(cp)); 1741 } 1742 } else 1743 cp++; 1744 } 1745 if (*cp != '\0') 1746 *cp++ = '\0'; 1747 *cpp = cp; 1748 return (start); 1749 } 1750 1751 static char * 1752 nextline(FILE *fd) 1753 { 1754 char *cp; 1755 1756 if (fgets(line, sizeof (line), fd) == NULL) 1757 return (NULL); 1758 cp = strchr(line, '\n'); 1759 if (cp) 1760 *cp = '\0'; 1761 return (line); 1762 } 1763 1764 static char * 1765 newstr(char *cp) 1766 { 1767 if ((cp = strdup((cp != NULL) ? cp : "")) != NULL) 1768 return (cp); 1769 syslog(LOG_ERR, "strdup: %m"); 1770 exit(1); 1771 } 1772 1773 static void 1774 inetd_setproctitle(char *a, int s) 1775 { 1776 socklen_t size; 1777 struct sockaddr_storage ss; 1778 char hbuf[NI_MAXHOST], *hp; 1779 1780 size = sizeof(ss); 1781 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) { 1782 if (getnameinfo((struct sockaddr *)&ss, size, hp = hbuf, 1783 sizeof(hbuf), NULL, 0, niflags) != 0) 1784 hp = "?"; 1785 setproctitle("-%s [%s]", a, hp); 1786 } else 1787 setproctitle("-%s", a); 1788 } 1789 1790 static void 1791 bump_nofile(void) 1792 { 1793 #ifdef RLIMIT_NOFILE 1794 1795 #define FD_CHUNK 32 1796 1797 struct rlimit rl; 1798 1799 if (getrlimit(RLIMIT_NOFILE, &rl) < 0) { 1800 syslog(LOG_ERR, "getrlimit: %m"); 1801 return; 1802 } 1803 rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK); 1804 if (rl.rlim_cur <= rlim_ofile_cur) { 1805 syslog(LOG_ERR, 1806 "bump_nofile: cannot extend file limit, max = %d", 1807 (int)rl.rlim_cur); 1808 return; 1809 } 1810 1811 if (setrlimit(RLIMIT_NOFILE, &rl) < 0) { 1812 syslog(LOG_ERR, "setrlimit: %m"); 1813 return; 1814 } 1815 1816 rlim_ofile_cur = rl.rlim_cur; 1817 return; 1818 1819 #else 1820 syslog(LOG_ERR, "bump_nofile: cannot extend file limit"); 1821 return; 1822 #endif 1823 } 1824 1825 /* 1826 * Internet services provided internally by inetd: 1827 */ 1828 #define BUFSIZE 4096 1829 1830 /* ARGSUSED */ 1831 static void 1832 echo_stream(int s, struct servtab *sep) /* Echo service -- echo data back */ 1833 { 1834 char buffer[BUFSIZE]; 1835 int i; 1836 1837 inetd_setproctitle(sep->se_service, s); 1838 while ((i = read(s, buffer, sizeof(buffer))) > 0 && 1839 write(s, buffer, i) > 0) 1840 ; 1841 } 1842 1843 /* ARGSUSED */ 1844 static void 1845 echo_dg(int s, struct servtab *sep) /* Echo service -- echo data back */ 1846 { 1847 char buffer[BUFSIZE]; 1848 int i; 1849 socklen_t size; 1850 struct sockaddr_storage ss; 1851 struct sockaddr *sa; 1852 1853 sa = (struct sockaddr *)&ss; 1854 size = sizeof(ss); 1855 if ((i = recvfrom(s, buffer, sizeof(buffer), 0, sa, &size)) < 0) 1856 return; 1857 if (port_good_dg(sa)) 1858 (void) sendto(s, buffer, i, 0, sa, size); 1859 } 1860 1861 /* ARGSUSED */ 1862 static void 1863 discard_stream(int s, struct servtab *sep) /* Discard service -- ignore data */ 1864 { 1865 char buffer[BUFSIZE]; 1866 1867 inetd_setproctitle(sep->se_service, s); 1868 while ((errno = 0, read(s, buffer, sizeof(buffer)) > 0) || 1869 errno == EINTR) 1870 ; 1871 } 1872 1873 /* ARGSUSED */ 1874 static void 1875 discard_dg(int s, struct servtab *sep) /* Discard service -- ignore data */ 1876 1877 { 1878 char buffer[BUFSIZE]; 1879 1880 (void) read(s, buffer, sizeof(buffer)); 1881 } 1882 1883 #include <ctype.h> 1884 #define LINESIZ 72 1885 char ring[128]; 1886 char *endring; 1887 1888 static void 1889 initring(void) 1890 { 1891 int i; 1892 1893 endring = ring; 1894 1895 for (i = 0; i <= 128; ++i) 1896 if (isprint(i)) 1897 *endring++ = i; 1898 } 1899 1900 /* ARGSUSED */ 1901 static void 1902 chargen_stream(int s,struct servtab *sep) /* Character generator */ 1903 { 1904 int len; 1905 char *rs, text[LINESIZ+2]; 1906 1907 inetd_setproctitle(sep->se_service, s); 1908 1909 if (!endring) { 1910 initring(); 1911 rs = ring; 1912 } 1913 1914 text[LINESIZ] = '\r'; 1915 text[LINESIZ + 1] = '\n'; 1916 for (rs = ring;;) { 1917 if ((len = endring - rs) >= LINESIZ) 1918 memmove(text, rs, LINESIZ); 1919 else { 1920 memmove(text, rs, len); 1921 memmove(text + len, ring, LINESIZ - len); 1922 } 1923 if (++rs == endring) 1924 rs = ring; 1925 if (write(s, text, sizeof(text)) != sizeof(text)) 1926 break; 1927 } 1928 } 1929 1930 /* ARGSUSED */ 1931 static void 1932 chargen_dg(int s, struct servtab *sep) /* Character generator */ 1933 { 1934 struct sockaddr_storage ss; 1935 struct sockaddr *sa; 1936 static char *rs; 1937 int len; 1938 socklen_t size; 1939 char text[LINESIZ+2]; 1940 1941 if (endring == 0) { 1942 initring(); 1943 rs = ring; 1944 } 1945 1946 sa = (struct sockaddr *)&ss; 1947 size = sizeof(ss); 1948 if (recvfrom(s, text, sizeof(text), 0, sa, &size) < 0) 1949 return; 1950 1951 if (!port_good_dg(sa)) 1952 return; 1953 1954 if ((len = endring - rs) >= LINESIZ) 1955 memmove(text, rs, LINESIZ); 1956 else { 1957 memmove(text, rs, len); 1958 memmove(text + len, ring, LINESIZ - len); 1959 } 1960 if (++rs == endring) 1961 rs = ring; 1962 text[LINESIZ] = '\r'; 1963 text[LINESIZ + 1] = '\n'; 1964 (void) sendto(s, text, sizeof(text), 0, sa, size); 1965 } 1966 1967 /* 1968 * Return a machine readable date and time, in the form of the 1969 * number of seconds since midnight, Jan 1, 1900. Since gettimeofday 1970 * returns the number of seconds since midnight, Jan 1, 1970, 1971 * we must add 2208988800 seconds to this figure to make up for 1972 * some seventy years Bell Labs was asleep. 1973 */ 1974 1975 static uint32_t 1976 machtime(void) 1977 { 1978 struct timeval tv; 1979 1980 if (gettimeofday(&tv, NULL) < 0) { 1981 if (debug) 1982 fprintf(stderr, "Unable to get time of day\n"); 1983 return (0); 1984 } 1985 #define OFFSET ((uint32_t)25567 * 24*60*60) 1986 return (htonl((uint32_t)(tv.tv_sec + OFFSET))); 1987 #undef OFFSET 1988 } 1989 1990 /* ARGSUSED */ 1991 static void 1992 machtime_stream(int s, struct servtab *sep) 1993 { 1994 uint32_t result; 1995 1996 result = machtime(); 1997 (void) write(s, (char *) &result, sizeof(result)); 1998 } 1999 2000 /* ARGSUSED */ 2001 void 2002 machtime_dg(int s, struct servtab *sep) 2003 { 2004 uint32_t result; 2005 struct sockaddr_storage ss; 2006 struct sockaddr *sa; 2007 socklen_t size; 2008 2009 sa = (struct sockaddr *)&ss; 2010 size = sizeof(ss); 2011 if (recvfrom(s, (char *)&result, sizeof(result), 0, sa, &size) < 0) 2012 return; 2013 if (!port_good_dg(sa)) 2014 return; 2015 result = machtime(); 2016 (void) sendto(s, (char *) &result, sizeof(result), 0, sa, size); 2017 } 2018 2019 /* ARGSUSED */ 2020 static void 2021 daytime_stream(int s,struct servtab *sep) 2022 /* Return human-readable time of day */ 2023 { 2024 char buffer[256]; 2025 time_t clock; 2026 int len; 2027 2028 clock = time((time_t *) 0); 2029 2030 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 2031 (void) write(s, buffer, len); 2032 } 2033 2034 /* ARGSUSED */ 2035 void 2036 daytime_dg(int s, struct servtab *sep) 2037 /* Return human-readable time of day */ 2038 { 2039 char buffer[256]; 2040 time_t clock; 2041 struct sockaddr_storage ss; 2042 struct sockaddr *sa; 2043 socklen_t size; 2044 int len; 2045 2046 clock = time((time_t *) 0); 2047 2048 sa = (struct sockaddr *)&ss; 2049 size = sizeof(ss); 2050 if (recvfrom(s, buffer, sizeof(buffer), 0, sa, &size) < 0) 2051 return; 2052 if (!port_good_dg(sa)) 2053 return; 2054 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 2055 (void) sendto(s, buffer, len, 0, sa, size); 2056 } 2057 2058 /* 2059 * print_service: 2060 * Dump relevant information to stderr 2061 */ 2062 static void 2063 print_service(char *action, struct servtab *sep) 2064 { 2065 2066 if (isrpcservice(sep)) 2067 fprintf(stderr, 2068 "%s: %s rpcprog=%d, rpcvers = %d/%d, proto=%s, wait.max=%d.%d, user:group=%s:%s builtin=%lx server=%s" 2069 #ifdef IPSEC 2070 " policy=\"%s\"" 2071 #endif 2072 "\n", 2073 action, sep->se_service, 2074 sep->se_rpcprog, sep->se_rpcversh, sep->se_rpcversl, sep->se_proto, 2075 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 2076 (long)sep->se_bi, sep->se_server 2077 #ifdef IPSEC 2078 , (sep->se_policy ? sep->se_policy : "") 2079 #endif 2080 ); 2081 else 2082 fprintf(stderr, 2083 "%s: %s proto=%s%s, wait.max=%d.%d, user:group=%s:%s builtin=%lx server=%s" 2084 #ifdef IPSEC 2085 " policy=%s" 2086 #endif 2087 "\n", 2088 action, sep->se_service, 2089 sep->se_type == FAITH_TYPE ? "faith/" : "", 2090 sep->se_proto, 2091 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 2092 (long)sep->se_bi, sep->se_server 2093 #ifdef IPSEC 2094 , (sep->se_policy ? sep->se_policy : "") 2095 #endif 2096 ); 2097 } 2098 2099 static void 2100 usage(void) 2101 { 2102 #ifdef LIBWRAP 2103 (void)fprintf(stderr, "usage: %s [-dl] [conf]\n", getprogname()); 2104 #else 2105 (void)fprintf(stderr, "usage: %s [-d] [conf]\n", getprogname()); 2106 #endif 2107 exit(1); 2108 } 2109 2110 2111 /* 2112 * Based on TCPMUX.C by Mark K. Lottor November 1988 2113 * sri-nic::ps:<mkl>tcpmux.c 2114 */ 2115 2116 static int /* # of characters upto \r,\n or \0 */ 2117 getline(int fd, char *buf, int len) 2118 { 2119 int count = 0, n; 2120 2121 do { 2122 n = read(fd, buf, len-count); 2123 if (n == 0) 2124 return (count); 2125 if (n < 0) 2126 return (-1); 2127 while (--n >= 0) { 2128 if (*buf == '\r' || *buf == '\n' || *buf == '\0') 2129 return (count); 2130 count++; 2131 buf++; 2132 } 2133 } while (count < len); 2134 return (count); 2135 } 2136 2137 #define MAX_SERV_LEN (256+2) /* 2 bytes for \r\n */ 2138 2139 #define strwrite(fd, buf) (void) write(fd, buf, sizeof(buf)-1) 2140 2141 static void 2142 tcpmux(int ctrl, struct servtab *sep) 2143 { 2144 char service[MAX_SERV_LEN+1]; 2145 int len; 2146 2147 /* Get requested service name */ 2148 if ((len = getline(ctrl, service, MAX_SERV_LEN)) < 0) { 2149 strwrite(ctrl, "-Error reading service name\r\n"); 2150 goto reject; 2151 } 2152 service[len] = '\0'; 2153 2154 if (debug) 2155 fprintf(stderr, "tcpmux: someone wants %s\n", service); 2156 2157 /* 2158 * Help is a required command, and lists available services, 2159 * one per line. 2160 */ 2161 if (!strcasecmp(service, "help")) { 2162 strwrite(ctrl, "+Available services:\r\n"); 2163 strwrite(ctrl, "help\r\n"); 2164 for (sep = servtab; sep != NULL; sep = sep->se_next) { 2165 if (!ISMUX(sep)) 2166 continue; 2167 (void)write(ctrl, sep->se_service, 2168 strlen(sep->se_service)); 2169 strwrite(ctrl, "\r\n"); 2170 } 2171 goto reject; 2172 } 2173 2174 /* Try matching a service in inetd.conf with the request */ 2175 for (sep = servtab; sep != NULL; sep = sep->se_next) { 2176 if (!ISMUX(sep)) 2177 continue; 2178 if (!strcasecmp(service, sep->se_service)) { 2179 if (ISMUXPLUS(sep)) 2180 strwrite(ctrl, "+Go\r\n"); 2181 run_service(ctrl, sep); 2182 return; 2183 } 2184 } 2185 strwrite(ctrl, "-Service not available\r\n"); 2186 reject: 2187 _exit(1); 2188 } 2189 2190 #ifdef MULOG 2191 void 2192 dolog(struct servtab *sep, int ctrl) 2193 { 2194 struct sockaddr_storage ss; 2195 struct sockaddr *sa = (struct sockaddr *)&ss; 2196 socklen_t len = sizeof(ss); 2197 char *host, *dp, buf[BUFSIZ]; 2198 int connected = 1; 2199 2200 switch (sep->se_family) { 2201 case AF_INET: 2202 #ifdef INET6 2203 case AF_INET6: 2204 #endif 2205 break; 2206 default: 2207 return; 2208 } 2209 2210 if (getpeername(ctrl, sa, &len) < 0) { 2211 if (errno != ENOTCONN) { 2212 syslog(LOG_ERR, "getpeername: %m"); 2213 return; 2214 } 2215 if (recvfrom(ctrl, buf, sizeof(buf), MSG_PEEK, sa, &len) < 0) { 2216 syslog(LOG_ERR, "recvfrom: %m"); 2217 return; 2218 } 2219 connected = 0; 2220 } 2221 switch (sa->sa_family) { 2222 case AF_INET: 2223 #ifdef INET6 2224 case AF_INET6: 2225 #endif 2226 break; 2227 default: 2228 syslog(LOG_ERR, "unexpected address family %u", sa->sa_family); 2229 return; 2230 } 2231 2232 if (getnameinfo(sa, len, buf, sizeof(buf), NULL, 0, 0) != 0) 2233 strlcpy(buf, "?", sizeof(buf)); 2234 host = buf; 2235 2236 switch (sep->se_log & ~MULOG_RFC931) { 2237 case 0: 2238 return; 2239 case 1: 2240 if (curdom == NULL || *curdom == '\0') 2241 break; 2242 dp = host + strlen(host) - strlen(curdom); 2243 if (dp < host) 2244 break; 2245 if (debug) 2246 fprintf(stderr, "check \"%s\" against curdom \"%s\"\n", 2247 host, curdom); 2248 if (strcasecmp(dp, curdom) == 0) 2249 return; 2250 break; 2251 case 2: 2252 default: 2253 break; 2254 } 2255 2256 openlog("", LOG_NOWAIT, MULOG); 2257 2258 if (connected && (sep->se_log & MULOG_RFC931)) 2259 syslog(LOG_INFO, "%s@%s wants %s", 2260 rfc931_name(sa, ctrl), host, sep->se_service); 2261 else 2262 syslog(LOG_INFO, "%s wants %s", 2263 host, sep->se_service); 2264 } 2265 2266 /* 2267 * From tcp_log by 2268 * Wietse Venema, Eindhoven University of Technology, The Netherlands. 2269 */ 2270 #if 0 2271 static char sccsid[] = "@(#) rfc931.c 1.3 92/08/31 22:54:46"; 2272 #endif 2273 2274 #include <setjmp.h> 2275 2276 #define RFC931_PORT 113 /* Semi-well-known port */ 2277 #define TIMEOUT 4 2278 #define TIMEOUT2 10 2279 2280 static jmp_buf timebuf; 2281 2282 /* timeout - handle timeouts */ 2283 2284 static void 2285 timeout(int sig) 2286 { 2287 longjmp(timebuf, sig); 2288 } 2289 2290 /* rfc931_name - return remote user name */ 2291 2292 char * 2293 rfc931_name(struct sockaddr *there, /* remote link information */ 2294 int ctrl) 2295 { 2296 struct sockaddr_storage here; /* local link information */ 2297 struct sockaddr_storage sin; /* for talking to RFC931 daemon */ 2298 socklen_t length; 2299 int s; 2300 unsigned remote; 2301 unsigned local; 2302 static char user[256]; /* XXX */ 2303 char buf[256]; 2304 char *cp; 2305 char *result = "USER_UNKNOWN"; 2306 int len; 2307 u_int16_t myport, hisport; 2308 2309 /* Find out local port number of our stdin. */ 2310 2311 length = sizeof(here); 2312 if (getsockname(ctrl, (struct sockaddr *) &here, &length) == -1) { 2313 syslog(LOG_ERR, "getsockname: %m"); 2314 return (result); 2315 } 2316 switch (here.ss_family) { 2317 case AF_INET: 2318 myport = ((struct sockaddr_in *)&here)->sin_port; 2319 break; 2320 #ifdef INET6 2321 case AF_INET6: 2322 myport = ((struct sockaddr_in6 *)&here)->sin6_port; 2323 break; 2324 #endif 2325 } 2326 switch (there->sa_family) { 2327 case AF_INET: 2328 hisport = ((struct sockaddr_in *)&there)->sin_port; 2329 break; 2330 #ifdef INET6 2331 case AF_INET6: 2332 hisport = ((struct sockaddr_in6 *)&there)->sin6_port; 2333 break; 2334 #endif 2335 } 2336 /* Set up timer so we won't get stuck. */ 2337 2338 if ((s = socket(here.ss_family, SOCK_STREAM, 0)) == -1) { 2339 syslog(LOG_ERR, "socket: %m"); 2340 return (result); 2341 } 2342 2343 sin = here; 2344 switch (sin.ss_family) { 2345 case AF_INET: 2346 ((struct sockaddr_in *)&sin)->sin_port = htons(0); 2347 break; 2348 #ifdef INET6 2349 case AF_INET6: 2350 ((struct sockaddr_in6 *)&sin)->sin6_port = htons(0); 2351 break; 2352 #endif 2353 } 2354 if (bind(s, (struct sockaddr *) &sin, sin.ss_len) == -1) { 2355 syslog(LOG_ERR, "bind: %m"); 2356 return (result); 2357 } 2358 2359 signal(SIGALRM, timeout); 2360 if (setjmp(timebuf)) { 2361 close(s); /* not: fclose(fp) */ 2362 return (result); 2363 } 2364 alarm(TIMEOUT); 2365 2366 /* Connect to the RFC931 daemon. */ 2367 2368 memcpy(&sin, there, there->sa_len); 2369 switch (sin.ss_family) { 2370 case AF_INET: 2371 ((struct sockaddr_in *)&sin)->sin_port = htons(RFC931_PORT); 2372 break; 2373 #ifdef INET6 2374 case AF_INET6: 2375 ((struct sockaddr_in6 *)&sin)->sin6_port = htons(RFC931_PORT); 2376 break; 2377 #endif 2378 } 2379 if (connect(s, (struct sockaddr *) &sin, sin.ss_len) == -1) { 2380 close(s); 2381 alarm(0); 2382 return (result); 2383 } 2384 2385 /* Query the RFC 931 server. Would 13-byte writes ever be broken up? */ 2386 (void)snprintf(buf, sizeof buf, "%u,%u\r\n", ntohs(hisport), 2387 ntohs(myport)); 2388 2389 for (len = 0, cp = buf; len < strlen(buf); ) { 2390 int n; 2391 2392 if ((n = write(s, cp, strlen(buf) - len)) == -1) { 2393 close(s); 2394 alarm(0); 2395 return (result); 2396 } 2397 cp += n; 2398 len += n; 2399 } 2400 2401 /* Read response */ 2402 for (cp = buf; cp < buf + sizeof(buf) - 1; ) { 2403 char c; 2404 if (read(s, &c, 1) != 1) { 2405 close(s); 2406 alarm(0); 2407 return (result); 2408 } 2409 if (c == '\n') 2410 break; 2411 *cp++ = c; 2412 } 2413 *cp = '\0'; 2414 2415 if (sscanf(buf, "%u , %u : USERID :%*[^:]:%255s", &remote, &local, 2416 user) == 3 && ntohs(hisport) == remote && ntohs(myport) == local) { 2417 /* Strip trailing carriage return. */ 2418 if ((cp = strchr(user, '\r')) != NULL) 2419 *cp = 0; 2420 result = user; 2421 } 2422 2423 alarm(0); 2424 close(s); 2425 return (result); 2426 } 2427 #endif 2428 2429 /* 2430 * check if the address/port where send data to is one of the obvious ports 2431 * that are used for denial of service attacks like two echo ports 2432 * just echoing data between them 2433 */ 2434 static int 2435 port_good_dg(struct sockaddr *sa) 2436 { 2437 struct in_addr in; 2438 #ifdef INET6 2439 struct in6_addr *in6; 2440 #endif 2441 u_int16_t port; 2442 int i, bad; 2443 char hbuf[NI_MAXHOST]; 2444 2445 bad = 0; 2446 2447 switch (sa->sa_family) { 2448 case AF_INET: 2449 in.s_addr = ntohl(((struct sockaddr_in *)sa)->sin_addr.s_addr); 2450 port = ntohs(((struct sockaddr_in *)sa)->sin_port); 2451 #ifdef INET6 2452 v4chk: 2453 #endif 2454 if (IN_MULTICAST(in.s_addr)) 2455 goto bad; 2456 switch ((in.s_addr & 0xff000000) >> 24) { 2457 case 0: case 127: case 255: 2458 goto bad; 2459 } 2460 if (dg_broadcast(&in)) 2461 goto bad; 2462 break; 2463 #ifdef INET6 2464 case AF_INET6: 2465 in6 = &((struct sockaddr_in6 *)sa)->sin6_addr; 2466 port = ntohs(((struct sockaddr_in6 *)sa)->sin6_port); 2467 if (IN6_IS_ADDR_MULTICAST(in6) || IN6_IS_ADDR_UNSPECIFIED(in6)) 2468 goto bad; 2469 if (IN6_IS_ADDR_V4MAPPED(in6) || IN6_IS_ADDR_V4COMPAT(in6)) { 2470 memcpy(&in, &in6->s6_addr[12], sizeof(in)); 2471 in.s_addr = ntohl(in.s_addr); 2472 goto v4chk; 2473 } 2474 break; 2475 #endif 2476 default: 2477 /* XXX unsupported af, is it safe to assume it to be safe? */ 2478 return (1); 2479 } 2480 2481 for (i = 0; bad_ports[i] != 0; i++) { 2482 if (port == bad_ports[i]) 2483 goto bad; 2484 } 2485 2486 return (1); 2487 2488 bad: 2489 if (getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), NULL, 0, 2490 niflags) != 0) 2491 strlcpy(hbuf, "?", sizeof(hbuf)); 2492 syslog(LOG_WARNING,"Possible DoS attack from %s, Port %d", 2493 hbuf, port); 2494 return (0); 2495 } 2496 2497 /* XXX need optimization */ 2498 static int 2499 dg_broadcast(struct in_addr *in) 2500 { 2501 struct ifaddrs *ifa, *ifap; 2502 struct sockaddr_in *sin; 2503 2504 if (getifaddrs(&ifap) < 0) 2505 return (0); 2506 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 2507 if (ifa->ifa_addr->sa_family != AF_INET || 2508 (ifa->ifa_flags & IFF_BROADCAST) == 0) 2509 continue; 2510 sin = (struct sockaddr_in *)ifa->ifa_broadaddr; 2511 if (sin->sin_addr.s_addr == in->s_addr) { 2512 freeifaddrs(ifap); 2513 return (1); 2514 } 2515 } 2516 freeifaddrs(ifap); 2517 return (0); 2518 } 2519 2520 static int 2521 my_kevent(const struct kevent *changelist, size_t nchanges, 2522 struct kevent *eventlist, size_t nevents) 2523 { 2524 int result; 2525 2526 while ((result = kevent(kq, changelist, nchanges, eventlist, nevents, 2527 NULL)) < 0) 2528 if (errno != EINTR) { 2529 syslog(LOG_ERR, "kevent: %m"); 2530 exit(EXIT_FAILURE); 2531 } 2532 2533 return (result); 2534 } 2535 2536 static struct kevent * 2537 allocchange(void) 2538 { 2539 if (changes == A_CNT(changebuf)) { 2540 (void) my_kevent(changebuf, A_CNT(changebuf), NULL, 0); 2541 changes = 0; 2542 } 2543 2544 return (&changebuf[changes++]); 2545 } 2546
Indexes created Fri Sep 26 08:10:20 GMT 2025