inetd.c revision 1.87
1 /* $NetBSD: inetd.c,v 1.87 2003/02/13 11:47:27 tron 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. All advertising materials mentioning features or use of this software 53 * must display the following acknowledgement: 54 * This product includes software developed by the University of 55 * California, Berkeley and its contributors. 56 * 4. Neither the name of the University nor the names of its contributors 57 * may be used to endorse or promote products derived from this software 58 * without specific prior written permission. 59 * 60 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 61 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 62 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 63 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 64 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 65 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 66 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 67 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 68 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 69 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 70 * SUCH DAMAGE. 71 */ 72 73 #include <sys/cdefs.h> 74 #ifndef lint 75 __COPYRIGHT("@(#) Copyright (c) 1983, 1991, 1993, 1994\n\ 76 The Regents of the University of California. All rights reserved.\n"); 77 #if 0 78 static char sccsid[] = "@(#)inetd.c 8.4 (Berkeley) 4/13/94"; 79 #else 80 __RCSID("$NetBSD: inetd.c,v 1.87 2003/02/13 11:47:27 tron Exp $"); 81 #endif 82 #endif /* not lint */ 83 84 /* 85 * Inetd - Internet super-server 86 * 87 * This program invokes all internet services as needed. Connection-oriented 88 * services are invoked each time a connection is made, by creating a process. 89 * This process is passed the connection as file descriptor 0 and is expected 90 * to do a getpeername to find out the source host and port. 91 * 92 * Datagram oriented services are invoked when a datagram 93 * arrives; a process is created and passed a pending message 94 * on file descriptor 0. Datagram servers may either connect 95 * to their peer, freeing up the original socket for inetd 96 * to receive further messages on, or ``take over the socket'', 97 * processing all arriving datagrams and, eventually, timing 98 * out. The first type of server is said to be ``multi-threaded''; 99 * the second type of server ``single-threaded''. 100 * 101 * Inetd uses a configuration file which is read at startup 102 * and, possibly, at some later time in response to a hangup signal. 103 * The configuration file is ``free format'' with fields given in the 104 * order shown below. Continuation lines for an entry must being with 105 * a space or tab. All fields must be present in each entry. 106 * 107 * service name must be in /etc/services or must 108 * name a tcpmux service 109 * socket type stream/dgram/raw/rdm/seqpacket 110 * protocol must be in /etc/protocols 111 * wait/nowait[:max] single-threaded/multi-threaded, max # 112 * user[:group] user/group to run daemon as 113 * server program full path name 114 * server program arguments maximum of MAXARGS (20) 115 * 116 * For RPC services 117 * service name/version must be in /etc/rpc 118 * socket type stream/dgram/raw/rdm/seqpacket 119 * protocol must be in /etc/protocols 120 * wait/nowait[:max] single-threaded/multi-threaded 121 * user[:group] user to run daemon as 122 * server program full path name 123 * server program arguments maximum of MAXARGS (20) 124 * 125 * For non-RPC services, the "service name" can be of the form 126 * hostaddress:servicename, in which case the hostaddress is used 127 * as the host portion of the address to listen on. If hostaddress 128 * consists of a single `*' character, INADDR_ANY is used. 129 * 130 * A line can also consist of just 131 * hostaddress: 132 * where hostaddress is as in the preceding paragraph. Such a line must 133 * have no further fields; the specified hostaddress is remembered and 134 * used for all further lines that have no hostaddress specified, 135 * until the next such line (or EOF). (This is why * is provided to 136 * allow explicit specification of INADDR_ANY.) A line 137 * *: 138 * is implicitly in effect at the beginning of the file. 139 * 140 * The hostaddress specifier may (and often will) contain dots; 141 * the service name must not. 142 * 143 * For RPC services, host-address specifiers are accepted and will 144 * work to some extent; however, because of limitations in the 145 * portmapper interface, it will not work to try to give more than 146 * one line for any given RPC service, even if the host-address 147 * specifiers are different. 148 * 149 * TCP services without official port numbers are handled with the 150 * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for 151 * requests. When a connection is made from a foreign host, the service 152 * requested is passed to tcpmux, which looks it up in the servtab list 153 * and returns the proper entry for the service. Tcpmux returns a 154 * negative reply if the service doesn't exist, otherwise the invoked 155 * server is expected to return the positive reply if the service type in 156 * inetd.conf file has the prefix "tcpmux/". If the service type has the 157 * prefix "tcpmux/+", tcpmux will return the positive reply for the 158 * process; this is for compatibility with older server code, and also 159 * allows you to invoke programs that use stdin/stdout without putting any 160 * special server code in them. Services that use tcpmux are "nowait" 161 * because they do not have a well-known port and hence cannot listen 162 * for new requests. 163 * 164 * Comment lines are indicated by a `#' in column 1. 165 * 166 * #ifdef IPSEC 167 * Comment lines that start with "#@" denote IPsec policy string, as described 168 * in ipsec_set_policy(3). This will affect all the following items in 169 * inetd.conf(8). To reset the policy, just use "#@" line. By default, 170 * there's no IPsec policy. 171 * #endif 172 */ 173 174 /* 175 * Here's the scoop concerning the user:group feature: 176 * 177 * 1) set-group-option off. 178 * 179 * a) user = root: NO setuid() or setgid() is done 180 * 181 * b) other: setuid() 182 * setgid(primary group as found in passwd) 183 * initgroups(name, primary group) 184 * 185 * 2) set-group-option on. 186 * 187 * a) user = root: NO setuid() 188 * setgid(specified group) 189 * NO initgroups() 190 * 191 * b) other: setuid() 192 * setgid(specified group) 193 * initgroups(name, specified group) 194 * 195 */ 196 197 #include <sys/param.h> 198 #include <sys/stat.h> 199 #include <sys/ioctl.h> 200 #include <sys/socket.h> 201 #include <sys/un.h> 202 #include <sys/wait.h> 203 #include <sys/time.h> 204 #include <sys/resource.h> 205 #include <sys/event.h> 206 207 #ifndef RLIMIT_NOFILE 208 #define RLIMIT_NOFILE RLIMIT_OFILE 209 #endif 210 211 #ifndef NO_RPC 212 #define RPC 213 #endif 214 215 #include <net/if.h> 216 217 #include <netinet/in.h> 218 #include <arpa/inet.h> 219 #ifdef RPC 220 #include <rpc/rpc.h> 221 #include <rpc/rpcb_clnt.h> 222 #include <netconfig.h> 223 #endif 224 225 #include <ctype.h> 226 #include <errno.h> 227 #include <fcntl.h> 228 #include <grp.h> 229 #include <netdb.h> 230 #include <pwd.h> 231 #include <signal.h> 232 #include <stdio.h> 233 #include <stdlib.h> 234 #include <string.h> 235 #include <syslog.h> 236 #include <unistd.h> 237 #include <util.h> 238 #include <ifaddrs.h> 239 240 #include "pathnames.h" 241 242 #ifdef IPSEC 243 #include <netinet6/ipsec.h> 244 #ifndef IPSEC_POLICY_IPSEC /* no ipsec support on old ipsec */ 245 #undef IPSEC 246 #endif 247 #include "ipsec.h" 248 #endif 249 250 #ifdef LIBWRAP 251 # include <tcpd.h> 252 #ifndef LIBWRAP_ALLOW_FACILITY 253 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH 254 #endif 255 #ifndef LIBWRAP_ALLOW_SEVERITY 256 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO 257 #endif 258 #ifndef LIBWRAP_DENY_FACILITY 259 # define LIBWRAP_DENY_FACILITY LOG_AUTH 260 #endif 261 #ifndef LIBWRAP_DENY_SEVERITY 262 # define LIBWRAP_DENY_SEVERITY LOG_WARNING 263 #endif 264 int allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY; 265 int deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY; 266 #endif 267 268 #define TOOMANY 40 /* don't start more than TOOMANY */ 269 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */ 270 #define RETRYTIME (60*10) /* retry after bind or server fail */ 271 272 #define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM)) 273 274 #define A_CNT(a) (sizeof (a) / sizeof (a[0])) 275 276 int debug; 277 #ifdef LIBWRAP 278 int lflag; 279 #endif 280 int nsock, maxsock; 281 int kq; 282 int options; 283 int timingout; 284 struct servent *sp; 285 char *curdom; 286 const int niflags = NI_NUMERICHOST | NI_NUMERICSERV; 287 288 #ifndef OPEN_MAX 289 #define OPEN_MAX 64 290 #endif 291 292 /* Reserve some descriptors, 3 stdio + at least: 1 log, 1 conf. file */ 293 #define FD_MARGIN (8) 294 rlim_t rlim_ofile_cur = OPEN_MAX; 295 296 #ifdef RLIMIT_NOFILE 297 struct rlimit rlim_ofile; 298 #endif 299 300 struct kevent changebuf[64]; 301 size_t changes; 302 303 struct servtab { 304 char *se_hostaddr; /* host address to listen on */ 305 char *se_service; /* name of service */ 306 int se_socktype; /* type of socket to use */ 307 int se_family; /* address family */ 308 char *se_proto; /* protocol used */ 309 int se_sndbuf; /* sndbuf size */ 310 int se_rcvbuf; /* rcvbuf size */ 311 int se_rpcprog; /* rpc program number */ 312 int se_rpcversl; /* rpc program lowest version */ 313 int se_rpcversh; /* rpc program highest version */ 314 #define isrpcservice(sep) ((sep)->se_rpcversl != 0) 315 pid_t se_wait; /* single threaded server */ 316 short se_checked; /* looked at during merge */ 317 char *se_user; /* user name to run as */ 318 char *se_group; /* group name to run as */ 319 struct biltin *se_bi; /* if built-in, description */ 320 char *se_server; /* server program */ 321 #define MAXARGV 20 322 char *se_argv[MAXARGV+1]; /* program arguments */ 323 #ifdef IPSEC 324 char *se_policy; /* IPsec poilcy string */ 325 #endif 326 int se_fd; /* open descriptor */ 327 int se_type; /* type */ 328 union { 329 struct sockaddr se_un_ctrladdr; 330 struct sockaddr_in se_un_ctrladdr_in; 331 struct sockaddr_in6 se_un_ctrladdr_in6; 332 struct sockaddr_un se_un_ctrladdr_un; 333 } se_un; /* bound address */ 334 #define se_ctrladdr se_un.se_un_ctrladdr 335 #define se_ctrladdr_in se_un.se_un_ctrladdr_in 336 #define se_ctrladdr_un se_un.se_un_ctrladdr_un 337 int se_ctrladdr_size; 338 int se_max; /* max # of instances of this service */ 339 int se_count; /* number started since se_time */ 340 struct timeval se_time; /* start of se_count */ 341 #ifdef MULOG 342 int se_log; 343 #define MULOG_RFC931 0x40000000 344 #endif 345 struct servtab *se_next; 346 } *servtab; 347 348 #define NORM_TYPE 0 349 #define MUX_TYPE 1 350 #define MUXPLUS_TYPE 2 351 #define FAITH_TYPE 3 352 #define ISMUX(sep) (((sep)->se_type == MUX_TYPE) || \ 353 ((sep)->se_type == MUXPLUS_TYPE)) 354 #define ISMUXPLUS(sep) ((sep)->se_type == MUXPLUS_TYPE) 355 356 357 static void chargen_dg(int, struct servtab *); 358 static void chargen_stream(int, struct servtab *); 359 static void close_sep(struct servtab *); 360 static void config(void); 361 static void daytime_dg(int, struct servtab *); 362 static void daytime_stream(int, struct servtab *); 363 static void discard_dg(int, struct servtab *); 364 static void discard_stream(int, struct servtab *); 365 static void echo_dg(int, struct servtab *); 366 static void echo_stream(int, struct servtab *); 367 static void endconfig(void); 368 static struct servtab *enter(struct servtab *); 369 static void freeconfig(struct servtab *); 370 static struct servtab *getconfigent(void); 371 static void goaway(void); 372 static void machtime_dg(int, struct servtab *); 373 static void machtime_stream(int, struct servtab *); 374 static char *newstr(char *); 375 static char *nextline(FILE *); 376 static void print_service(char *, struct servtab *); 377 static void reapchild(void); 378 static void retry(void); 379 static void run_service(int, struct servtab *); 380 static int setconfig(void); 381 static void setup(struct servtab *); 382 static char *sskip(char **); 383 static char *skip(char **); 384 static void tcpmux(int, struct servtab *); 385 static void usage(void); 386 static void register_rpc(struct servtab *); 387 static void unregister_rpc(struct servtab *); 388 static void bump_nofile(void); 389 static void inetd_setproctitle(char *, int); 390 static void initring(void); 391 static uint32_t machtime(void); 392 static int port_good_dg(struct sockaddr *); 393 static int dg_broadcast(struct in_addr *); 394 static int my_kevent(const struct kevent *, size_t, struct kevent *, 395 size_t); 396 static struct kevent * allocchange(void); 397 static int getline(int, char *, int); 398 static void spawn(struct servtab *, int); 399 #ifdef MULOG 400 static void dolog(struct servtab *, int); 401 static void timeout(int); 402 static char *rfc931_name(struct sockaddr *, int); 403 #endif 404 405 struct biltin { 406 char *bi_service; /* internally provided service name */ 407 int bi_socktype; /* type of socket supported */ 408 short bi_fork; /* 1 if should fork before call */ 409 short bi_wait; /* 1 if should wait for child */ 410 void (*bi_fn)(int, struct servtab *); 411 /* function which performs it */ 412 } biltins[] = { 413 /* Echo received data */ 414 { "echo", SOCK_STREAM, 1, 0, echo_stream }, 415 { "echo", SOCK_DGRAM, 0, 0, echo_dg }, 416 417 /* Internet /dev/null */ 418 { "discard", SOCK_STREAM, 1, 0, discard_stream }, 419 { "discard", SOCK_DGRAM, 0, 0, discard_dg }, 420 421 /* Return 32 bit time since 1970 */ 422 { "time", SOCK_STREAM, 0, 0, machtime_stream }, 423 { "time", SOCK_DGRAM, 0, 0, machtime_dg }, 424 425 /* Return human-readable time */ 426 { "daytime", SOCK_STREAM, 0, 0, daytime_stream }, 427 { "daytime", SOCK_DGRAM, 0, 0, daytime_dg }, 428 429 /* Familiar character generator */ 430 { "chargen", SOCK_STREAM, 1, 0, chargen_stream }, 431 { "chargen", SOCK_DGRAM, 0, 0, chargen_dg }, 432 433 { "tcpmux", SOCK_STREAM, 1, 0, tcpmux }, 434 435 { NULL } 436 }; 437 438 /* list of "bad" ports. I.e. ports that are most obviously used for 439 * "cycling packets" denial of service attacks. See /etc/services. 440 * List must end with port number "0". 441 */ 442 443 u_int16_t bad_ports[] = { 7, 9, 13, 19, 37, 0 }; 444 445 446 #define NUMINT (sizeof(intab) / sizeof(struct inent)) 447 char *CONFIG = _PATH_INETDCONF; 448 449 static int my_signals[] = { SIGALRM, SIGHUP, SIGCHLD, SIGTERM, SIGINT }; 450 451 int 452 main(int argc, char *argv[]) 453 { 454 int ch, n, reload = 1; 455 struct kevent *ev; 456 457 while ((ch = getopt(argc, argv, 458 #ifdef LIBWRAP 459 "dl" 460 #else 461 "d" 462 #endif 463 )) != -1) 464 switch(ch) { 465 case 'd': 466 debug = 1; 467 options |= SO_DEBUG; 468 break; 469 #ifdef LIBWRAP 470 case 'l': 471 lflag = 1; 472 break; 473 #endif 474 case '?': 475 default: 476 usage(); 477 } 478 argc -= optind; 479 argv += optind; 480 481 if (argc > 0) 482 CONFIG = argv[0]; 483 484 if (!debug) 485 daemon(0, 0); 486 openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON); 487 pidfile(NULL); 488 489 kq = kqueue(); 490 if (kq < 0) { 491 syslog(LOG_ERR, "kqueue: %m"); 492 return (EXIT_FAILURE); 493 } 494 495 #ifdef RLIMIT_NOFILE 496 if (getrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) { 497 syslog(LOG_ERR, "getrlimit: %m"); 498 } else { 499 rlim_ofile_cur = rlim_ofile.rlim_cur; 500 if (rlim_ofile_cur == RLIM_INFINITY) /* ! */ 501 rlim_ofile_cur = OPEN_MAX; 502 } 503 #endif 504 505 for (n = 0; n < A_CNT(my_signals); n++) { 506 (void) signal(my_signals[n], SIG_IGN); 507 ev = allocchange(); 508 EV_SET(ev, my_signals[n], EVFILT_SIGNAL, EV_ADD | EV_ENABLE, 509 0, 0, NULL); 510 } 511 (void) signal(SIGPIPE, SIG_IGN); 512 513 for (;;) { 514 int ctrl; 515 struct kevent eventbuf[64]; 516 struct servtab *sep; 517 518 if (reload) { 519 reload = 0; 520 config(); 521 } 522 523 if (nsock == 0) { 524 (void) sigblock(SIGBLOCK); 525 while (nsock == 0) 526 sigpause(0L); 527 (void) sigsetmask(0L); 528 } 529 n = my_kevent(changebuf, changes, eventbuf, A_CNT(eventbuf)); 530 changes = 0; 531 532 for (ev = eventbuf; n > 0; ev++, n--) { 533 if (ev->filter == EVFILT_SIGNAL) { 534 switch (ev->ident) { 535 case SIGALRM: 536 retry(); 537 break; 538 case SIGCHLD: 539 reapchild(); 540 break; 541 case SIGTERM: 542 case SIGINT: 543 goaway(); 544 break; 545 case SIGHUP: 546 reload = 1; 547 break; 548 } 549 continue; 550 } 551 if (ev->filter != EVFILT_READ) 552 continue; 553 sep = (struct servtab *)ev->udata; 554 /* Paranoia */ 555 if (ev->ident != sep->se_fd) 556 continue; 557 if (debug) 558 fprintf(stderr, "someone wants %s\n", sep->se_service); 559 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 560 /* XXX here do the libwrap check-before-accept */ 561 ctrl = accept(sep->se_fd, NULL, NULL); 562 if (debug) 563 fprintf(stderr, "accept, ctrl %d\n", 564 ctrl); 565 if (ctrl < 0) { 566 if (errno != EINTR) 567 syslog(LOG_WARNING, 568 "accept (for %s): %m", 569 sep->se_service); 570 continue; 571 } 572 } else 573 ctrl = sep->se_fd; 574 (void) sigblock(SIGBLOCK); 575 spawn(sep, ctrl); 576 } 577 } 578 } 579 580 static void 581 spawn(struct servtab *sep, int ctrl) 582 { 583 int dofork; 584 pid_t pid; 585 struct sigvec sv; 586 587 pid = 0; 588 #ifdef LIBWRAP_INTERNAL 589 dofork = 1; 590 #else 591 dofork = (sep->se_bi == 0 || sep->se_bi->bi_fork); 592 #endif 593 if (dofork) { 594 if (sep->se_count++ == 0) 595 (void)gettimeofday(&sep->se_time, NULL); 596 else if (sep->se_count >= sep->se_max) { 597 struct timeval now; 598 599 (void)gettimeofday(&now, NULL); 600 if (now.tv_sec - sep->se_time.tv_sec > CNT_INTVL) { 601 sep->se_time = now; 602 sep->se_count = 1; 603 } else { 604 syslog(LOG_ERR, 605 "%s/%s server failing (looping), service terminated\n", 606 sep->se_service, sep->se_proto); 607 if (!sep->se_wait && sep->se_socktype == 608 SOCK_STREAM) 609 close(ctrl); 610 close_sep(sep); 611 sigsetmask(0L); 612 if (!timingout) { 613 timingout = 1; 614 alarm(RETRYTIME); 615 } 616 return; 617 } 618 } 619 pid = fork(); 620 if (pid < 0) { 621 syslog(LOG_ERR, "fork: %m"); 622 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 623 close(ctrl); 624 sigsetmask(0L); 625 sleep(1); 626 return; 627 } 628 if (pid != 0 && sep->se_wait) { 629 struct kevent *ev; 630 631 sep->se_wait = pid; 632 ev = allocchange(); 633 EV_SET(ev, sep->se_fd, EVFILT_READ, 634 EV_DELETE, 0, 0, 0); 635 nsock--; 636 } 637 if (pid == 0) { 638 memset(&sv, 0, sizeof(sv)); 639 sv.sv_mask = 0L; 640 sv.sv_handler = SIG_DFL; 641 sigvec(SIGPIPE, &sv, NULL); 642 if (debug) 643 setsid(); 644 } 645 } 646 sigsetmask(0L); 647 if (pid == 0) { 648 run_service(ctrl, sep); 649 if (dofork) 650 exit(0); 651 } 652 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 653 close(ctrl); 654 } 655 656 static void 657 run_service(int ctrl, struct servtab *sep) 658 { 659 struct passwd *pwd; 660 struct group *grp = NULL; /* XXX gcc */ 661 char buf[NI_MAXSERV]; 662 #ifdef LIBWRAP 663 struct request_info req; 664 int denied; 665 char *service = NULL; /* XXX gcc */ 666 #endif 667 668 #ifdef LIBWRAP 669 #ifndef LIBWRAP_INTERNAL 670 if (sep->se_bi == 0) 671 #endif 672 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 673 request_init(&req, RQ_DAEMON, sep->se_argv[0] ? 674 sep->se_argv[0] : sep->se_service, RQ_FILE, ctrl, NULL); 675 fromhost(&req); 676 denied = !hosts_access(&req); 677 if (denied || lflag) { 678 if (getnameinfo(&sep->se_ctrladdr, 679 sep->se_ctrladdr.sa_len, NULL, 0, 680 buf, sizeof(buf), 0) != 0) { 681 /* shouldn't happen */ 682 (void)snprintf(buf, sizeof buf, "%d", 683 ntohs(sep->se_ctrladdr_in.sin_port)); 684 } 685 service = buf; 686 } 687 if (denied) { 688 syslog(deny_severity, 689 "refused connection from %.500s, service %s (%s)", 690 eval_client(&req), service, sep->se_proto); 691 goto reject; 692 } 693 if (lflag) { 694 syslog(allow_severity, 695 "connection from %.500s, service %s (%s)", 696 eval_client(&req), service, sep->se_proto); 697 } 698 } 699 #endif /* LIBWRAP */ 700 701 if (sep->se_bi) { 702 (*sep->se_bi->bi_fn)(ctrl, sep); 703 } else { 704 if ((pwd = getpwnam(sep->se_user)) == NULL) { 705 syslog(LOG_ERR, "%s/%s: %s: No such user", 706 sep->se_service, sep->se_proto, sep->se_user); 707 goto reject; 708 } 709 if (sep->se_group && 710 (grp = getgrnam(sep->se_group)) == NULL) { 711 syslog(LOG_ERR, "%s/%s: %s: No such group", 712 sep->se_service, sep->se_proto, sep->se_group); 713 goto reject; 714 } 715 if (pwd->pw_uid) { 716 if (sep->se_group) 717 pwd->pw_gid = grp->gr_gid; 718 if (setgid(pwd->pw_gid) < 0) { 719 syslog(LOG_ERR, 720 "%s/%s: can't set gid %d: %m", sep->se_service, 721 sep->se_proto, pwd->pw_gid); 722 goto reject; 723 } 724 (void) initgroups(pwd->pw_name, 725 pwd->pw_gid); 726 if (setuid(pwd->pw_uid) < 0) { 727 syslog(LOG_ERR, 728 "%s/%s: can't set uid %d: %m", sep->se_service, 729 sep->se_proto, pwd->pw_uid); 730 goto reject; 731 } 732 } else if (sep->se_group) { 733 (void) setgid((gid_t)grp->gr_gid); 734 } 735 if (debug) 736 fprintf(stderr, "%d execl %s\n", 737 getpid(), sep->se_server); 738 #ifdef MULOG 739 if (sep->se_log) 740 dolog(sep, ctrl); 741 #endif 742 /* Set our control descriptor to not close-on-exec... */ 743 if (fcntl(ctrl, F_SETFD, 0) < 0) 744 syslog(LOG_ERR, "fcntl (F_SETFD, 0): %m"); 745 /* ...and dup it to stdin, stdout, and stderr. */ 746 if (ctrl != 0) { 747 dup2(ctrl, 0); 748 close(ctrl); 749 ctrl = 0; 750 } 751 dup2(0, 1); 752 dup2(0, 2); 753 #ifdef RLIMIT_NOFILE 754 if (rlim_ofile.rlim_cur != rlim_ofile_cur && 755 setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) 756 syslog(LOG_ERR, "setrlimit: %m"); 757 #endif 758 execv(sep->se_server, sep->se_argv); 759 syslog(LOG_ERR, "cannot execute %s: %m", sep->se_server); 760 reject: 761 if (sep->se_socktype != SOCK_STREAM) 762 recv(ctrl, buf, sizeof (buf), 0); 763 _exit(1); 764 } 765 } 766 767 static void 768 reapchild(void) 769 { 770 int status; 771 pid_t pid; 772 struct servtab *sep; 773 774 for (;;) { 775 pid = wait3(&status, WNOHANG, NULL); 776 if (pid <= 0) 777 break; 778 if (debug) 779 (void) fprintf(stderr, "%d reaped, status %#x\n", 780 pid, status); 781 for (sep = servtab; sep != NULL; sep = sep->se_next) 782 if (sep->se_wait == pid) { 783 struct kevent *ev; 784 785 if (WIFEXITED(status) && WEXITSTATUS(status)) 786 syslog(LOG_WARNING, 787 "%s: exit status 0x%x", 788 sep->se_server, WEXITSTATUS(status)); 789 else if (WIFSIGNALED(status)) 790 syslog(LOG_WARNING, 791 "%s: exit signal 0x%x", 792 sep->se_server, WTERMSIG(status)); 793 sep->se_wait = 1; 794 ev = allocchange(); 795 EV_SET(ev, sep->se_fd, EVFILT_READ, 796 EV_ADD | EV_ENABLE, 0, 0, (intptr_t)sep); 797 nsock++; 798 if (debug) 799 fprintf(stderr, "restored %s, fd %d\n", 800 sep->se_service, sep->se_fd); 801 } 802 } 803 } 804 805 static void 806 config(void) 807 { 808 struct servtab *sep, *cp, **sepp; 809 long omask; 810 int n; 811 812 if (!setconfig()) { 813 syslog(LOG_ERR, "%s: %m", CONFIG); 814 return; 815 } 816 for (sep = servtab; sep != NULL; sep = sep->se_next) 817 sep->se_checked = 0; 818 while ((cp = getconfigent())) { 819 for (sep = servtab; sep != NULL; sep = sep->se_next) 820 if (strcmp(sep->se_service, cp->se_service) == 0 && 821 strcmp(sep->se_hostaddr, cp->se_hostaddr) == 0 && 822 strcmp(sep->se_proto, cp->se_proto) == 0 && 823 ISMUX(sep) == ISMUX(cp)) 824 break; 825 if (sep != NULL) { 826 int i; 827 828 #define SWAP(type, a, b) {type c=(type)a; (type)a=(type)b; (type)b=(type)c;} 829 830 omask = sigblock(SIGBLOCK); 831 /* 832 * sep->se_wait may be holding the pid of a daemon 833 * that we're waiting for. If so, don't overwrite 834 * it unless the config file explicitly says don't 835 * wait. 836 */ 837 if (cp->se_bi == 0 && 838 (sep->se_wait == 1 || cp->se_wait == 0)) 839 sep->se_wait = cp->se_wait; 840 SWAP(char *, sep->se_user, cp->se_user); 841 SWAP(char *, sep->se_group, cp->se_group); 842 SWAP(char *, sep->se_server, cp->se_server); 843 for (i = 0; i < MAXARGV; i++) 844 SWAP(char *, sep->se_argv[i], cp->se_argv[i]); 845 #ifdef IPSEC 846 SWAP(char *, sep->se_policy, cp->se_policy); 847 #endif 848 SWAP(int, cp->se_type, sep->se_type); 849 SWAP(int, cp->se_max, sep->se_max); 850 #undef SWAP 851 if (isrpcservice(sep)) 852 unregister_rpc(sep); 853 sep->se_rpcversl = cp->se_rpcversl; 854 sep->se_rpcversh = cp->se_rpcversh; 855 sigsetmask(omask); 856 freeconfig(cp); 857 if (debug) 858 print_service("REDO", sep); 859 } else { 860 sep = enter(cp); 861 if (debug) 862 print_service("ADD ", sep); 863 } 864 sep->se_checked = 1; 865 866 switch (sep->se_family) { 867 case AF_LOCAL: 868 if (sep->se_fd != -1) 869 break; 870 n = strlen(sep->se_service); 871 if (n > sizeof(sep->se_ctrladdr_un.sun_path)) { 872 syslog(LOG_ERR, "%s: address too long", 873 sep->se_service); 874 sep->se_checked = 0; 875 continue; 876 } 877 (void)unlink(sep->se_service); 878 strncpy(sep->se_ctrladdr_un.sun_path, 879 sep->se_service, n); 880 sep->se_ctrladdr_un.sun_family = AF_LOCAL; 881 sep->se_ctrladdr_size = n + 882 sizeof(sep->se_ctrladdr_un) - 883 sizeof(sep->se_ctrladdr_un.sun_path); 884 if (!ISMUX(sep)) 885 setup(sep); 886 break; 887 case AF_INET: 888 #ifdef INET6 889 case AF_INET6: 890 #endif 891 { 892 struct addrinfo hints, *res; 893 char *host, *port; 894 int error; 895 int s; 896 897 /* check if the family is supported */ 898 s = socket(sep->se_family, SOCK_DGRAM, 0); 899 if (s < 0) { 900 syslog(LOG_WARNING, 901 "%s/%s: %s: the address family is not supported by the kernel", 902 sep->se_service, sep->se_proto, 903 sep->se_hostaddr); 904 sep->se_checked = 0; 905 continue; 906 } 907 close(s); 908 909 memset(&hints, 0, sizeof(hints)); 910 hints.ai_family = sep->se_family; 911 hints.ai_socktype = sep->se_socktype; 912 hints.ai_flags = AI_PASSIVE; 913 if (!strcmp(sep->se_hostaddr, "*")) 914 host = NULL; 915 else 916 host = sep->se_hostaddr; 917 if (isrpcservice(sep) || ISMUX(sep)) 918 port = "0"; 919 else 920 port = sep->se_service; 921 error = getaddrinfo(host, port, &hints, &res); 922 if (error) { 923 if (error == EAI_SERVICE) { 924 /* gai_strerror not friendly enough */ 925 syslog(LOG_WARNING, "%s/%s: " 926 "unknown service", 927 sep->se_service, sep->se_proto); 928 } else { 929 syslog(LOG_ERR, "%s/%s: %s: %s", 930 sep->se_service, sep->se_proto, 931 sep->se_hostaddr, 932 gai_strerror(error)); 933 } 934 sep->se_checked = 0; 935 continue; 936 } 937 if (res->ai_next) { 938 syslog(LOG_ERR, 939 "%s/%s: %s: resolved to multiple addr", 940 sep->se_service, sep->se_proto, 941 sep->se_hostaddr); 942 sep->se_checked = 0; 943 freeaddrinfo(res); 944 continue; 945 } 946 memcpy(&sep->se_ctrladdr, res->ai_addr, 947 res->ai_addrlen); 948 if (ISMUX(sep)) { 949 sep->se_fd = -1; 950 freeaddrinfo(res); 951 continue; 952 } 953 sep->se_ctrladdr_size = res->ai_addrlen; 954 freeaddrinfo(res); 955 #ifdef RPC 956 if (isrpcservice(sep)) { 957 struct rpcent *rp; 958 959 sep->se_rpcprog = atoi(sep->se_service); 960 if (sep->se_rpcprog == 0) { 961 rp = getrpcbyname(sep->se_service); 962 if (rp == 0) { 963 syslog(LOG_ERR, 964 "%s/%s: unknown service", 965 sep->se_service, 966 sep->se_proto); 967 sep->se_checked = 0; 968 continue; 969 } 970 sep->se_rpcprog = rp->r_number; 971 } 972 if (sep->se_fd == -1 && !ISMUX(sep)) 973 setup(sep); 974 if (sep->se_fd != -1) 975 register_rpc(sep); 976 } else 977 #endif 978 { 979 if (sep->se_fd >= 0) 980 close_sep(sep); 981 if (sep->se_fd == -1 && !ISMUX(sep)) 982 setup(sep); 983 } 984 } 985 } 986 } 987 endconfig(); 988 /* 989 * Purge anything not looked at above. 990 */ 991 omask = sigblock(SIGBLOCK); 992 sepp = &servtab; 993 while ((sep = *sepp)) { 994 if (sep->se_checked) { 995 sepp = &sep->se_next; 996 continue; 997 } 998 *sepp = sep->se_next; 999 if (sep->se_fd >= 0) 1000 close_sep(sep); 1001 if (isrpcservice(sep)) 1002 unregister_rpc(sep); 1003 if (sep->se_family == AF_LOCAL) 1004 (void)unlink(sep->se_service); 1005 if (debug) 1006 print_service("FREE", sep); 1007 freeconfig(sep); 1008 free(sep); 1009 } 1010 (void) sigsetmask(omask); 1011 } 1012 1013 static void 1014 retry(void) 1015 { 1016 struct servtab *sep; 1017 1018 timingout = 0; 1019 for (sep = servtab; sep != NULL; sep = sep->se_next) { 1020 if (sep->se_fd == -1 && !ISMUX(sep)) { 1021 switch (sep->se_family) { 1022 case AF_LOCAL: 1023 case AF_INET: 1024 #ifdef INET6 1025 case AF_INET6: 1026 #endif 1027 setup(sep); 1028 if (sep->se_fd != -1 && isrpcservice(sep)) 1029 register_rpc(sep); 1030 break; 1031 } 1032 } 1033 } 1034 } 1035 1036 static void 1037 goaway(void) 1038 { 1039 struct servtab *sep; 1040 1041 for (sep = servtab; sep != NULL; sep = sep->se_next) { 1042 if (sep->se_fd == -1) 1043 continue; 1044 1045 switch (sep->se_family) { 1046 case AF_LOCAL: 1047 (void)unlink(sep->se_service); 1048 break; 1049 case AF_INET: 1050 #ifdef INET6 1051 case AF_INET6: 1052 #endif 1053 if (sep->se_wait == 1 && isrpcservice(sep)) 1054 unregister_rpc(sep); 1055 break; 1056 } 1057 (void)close(sep->se_fd); 1058 } 1059 exit(0); 1060 } 1061 1062 static void 1063 setup(struct servtab *sep) 1064 { 1065 int on = 1; 1066 struct kevent *ev; 1067 1068 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) { 1069 if (debug) 1070 fprintf(stderr, "socket failed on %s/%s: %s\n", 1071 sep->se_service, sep->se_proto, strerror(errno)); 1072 syslog(LOG_ERR, "%s/%s: socket: %m", 1073 sep->se_service, sep->se_proto); 1074 return; 1075 } 1076 /* Set all listening sockets to close-on-exec. */ 1077 if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) { 1078 syslog(LOG_ERR, "%s/%s: fcntl(F_SETFD, FD_CLOEXEC): %m", 1079 sep->se_service, sep->se_proto); 1080 close(sep->se_fd); 1081 return; 1082 } 1083 1084 #define turnon(fd, opt) \ 1085 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 1086 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 1087 turnon(sep->se_fd, SO_DEBUG) < 0) 1088 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 1089 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 1090 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 1091 #undef turnon 1092 1093 /* Set the socket buffer sizes, if specified. */ 1094 if (sep->se_sndbuf != 0 && setsockopt(sep->se_fd, SOL_SOCKET, 1095 SO_SNDBUF, (char *)&sep->se_sndbuf, sizeof(sep->se_sndbuf)) < 0) 1096 syslog(LOG_ERR, "setsockopt (SO_SNDBUF %d): %m", 1097 sep->se_sndbuf); 1098 if (sep->se_rcvbuf != 0 && setsockopt(sep->se_fd, SOL_SOCKET, 1099 SO_RCVBUF, (char *)&sep->se_rcvbuf, sizeof(sep->se_rcvbuf)) < 0) 1100 syslog(LOG_ERR, "setsockopt (SO_RCVBUF %d): %m", 1101 sep->se_rcvbuf); 1102 if (sep->se_type == FAITH_TYPE && setsockopt(sep->se_fd, IPPROTO_IPV6, 1103 IPV6_FAITH, (char *)&on, sizeof(on)) < 0) 1104 syslog(LOG_ERR, "setsockopt (IPV6_FAITH): %m"); 1105 #ifdef IPSEC 1106 if (ipsecsetup(sep->se_family, sep->se_fd, sep->se_policy) < 0 && 1107 sep->se_policy) { 1108 syslog(LOG_ERR, "%s/%s: ipsec setup failed", 1109 sep->se_service, sep->se_proto); 1110 (void)close(sep->se_fd); 1111 sep->se_fd = -1; 1112 return; 1113 } 1114 #endif 1115 1116 if (bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size) < 0) { 1117 if (debug) 1118 fprintf(stderr, "bind failed on %s/%s: %s\n", 1119 sep->se_service, sep->se_proto, strerror(errno)); 1120 syslog(LOG_ERR, "%s/%s: bind: %m", 1121 sep->se_service, sep->se_proto); 1122 (void) close(sep->se_fd); 1123 sep->se_fd = -1; 1124 if (!timingout) { 1125 timingout = 1; 1126 alarm(RETRYTIME); 1127 } 1128 return; 1129 } 1130 if (sep->se_socktype == SOCK_STREAM) 1131 listen(sep->se_fd, 10); 1132 1133 ev = allocchange(); 1134 EV_SET(ev, sep->se_fd, EVFILT_READ, EV_ADD | EV_ENABLE, 0, 0, 1135 (intptr_t)sep); 1136 nsock++; 1137 if (sep->se_fd > maxsock) { 1138 maxsock = sep->se_fd; 1139 if (maxsock > rlim_ofile_cur - FD_MARGIN) 1140 bump_nofile(); 1141 } 1142 if (debug) 1143 fprintf(stderr, "registered %s on %d\n", 1144 sep->se_server, sep->se_fd); 1145 } 1146 1147 /* 1148 * Finish with a service and its socket. 1149 */ 1150 static void 1151 close_sep(struct servtab *sep) 1152 { 1153 if (sep->se_fd >= 0) { 1154 nsock--; 1155 (void) close(sep->se_fd); 1156 sep->se_fd = -1; 1157 } 1158 sep->se_count = 0; 1159 /* 1160 * Don't keep the pid of this running daemon: when reapchild() 1161 * reaps this pid, it would erroneously increment nsock. 1162 */ 1163 if (sep->se_wait > 1) 1164 sep->se_wait = 1; 1165 } 1166 1167 static void 1168 register_rpc(struct servtab *sep) 1169 { 1170 #ifdef RPC 1171 int n; 1172 struct netbuf nbuf; 1173 struct sockaddr_storage ss; 1174 struct netconfig *nconf; 1175 1176 if ((nconf = getnetconfigent(sep->se_proto+4)) == NULL) { 1177 syslog(LOG_ERR, "%s: getnetconfigent failed", 1178 sep->se_proto); 1179 return; 1180 } 1181 n = sizeof ss; 1182 if (getsockname(sep->se_fd, (struct sockaddr *)&ss, &n) < 0) { 1183 syslog(LOG_ERR, "%s/%s: getsockname: %m", 1184 sep->se_service, sep->se_proto); 1185 return; 1186 } 1187 1188 nbuf.buf = &ss; 1189 nbuf.len = ss.ss_len; 1190 nbuf.maxlen = sizeof (struct sockaddr_storage); 1191 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1192 if (debug) 1193 fprintf(stderr, "rpcb_set: %u %d %s %s\n", 1194 sep->se_rpcprog, n, nconf->nc_netid, 1195 taddr2uaddr(nconf, &nbuf)); 1196 (void)rpcb_unset(sep->se_rpcprog, n, nconf); 1197 if (!rpcb_set(sep->se_rpcprog, n, nconf, &nbuf)) 1198 syslog(LOG_ERR, "rpcb_set: %u %d %s %s%s", 1199 sep->se_rpcprog, n, nconf->nc_netid, 1200 taddr2uaddr(nconf, &nbuf), clnt_spcreateerror("")); 1201 } 1202 #endif /* RPC */ 1203 } 1204 1205 static void 1206 unregister_rpc(struct servtab *sep) 1207 { 1208 #ifdef RPC 1209 int n; 1210 struct netconfig *nconf; 1211 1212 if ((nconf = getnetconfigent(sep->se_proto+4)) == NULL) { 1213 syslog(LOG_ERR, "%s: getnetconfigent failed", 1214 sep->se_proto); 1215 return; 1216 } 1217 1218 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1219 if (debug) 1220 fprintf(stderr, "rpcb_unset(%u, %d, %s)\n", 1221 sep->se_rpcprog, n, nconf->nc_netid); 1222 if (!rpcb_unset(sep->se_rpcprog, n, nconf)) 1223 syslog(LOG_ERR, "rpcb_unset(%u, %d, %s) failed\n", 1224 sep->se_rpcprog, n, nconf->nc_netid); 1225 } 1226 #endif /* RPC */ 1227 } 1228 1229 1230 static struct servtab * 1231 enter(struct servtab *cp) 1232 { 1233 struct servtab *sep; 1234 long omask; 1235 1236 sep = (struct servtab *)malloc(sizeof (*sep)); 1237 if (sep == NULL) { 1238 syslog(LOG_ERR, "Out of memory."); 1239 exit(1); 1240 } 1241 *sep = *cp; 1242 sep->se_fd = -1; 1243 sep->se_rpcprog = -1; 1244 omask = sigblock(SIGBLOCK); 1245 sep->se_next = servtab; 1246 servtab = sep; 1247 sigsetmask(omask); 1248 return (sep); 1249 } 1250 1251 FILE *fconfig = NULL; 1252 struct servtab serv; 1253 char line[LINE_MAX]; 1254 char *defhost; 1255 #ifdef IPSEC 1256 static char *policy = NULL; 1257 #endif 1258 1259 static int 1260 setconfig(void) 1261 { 1262 if (defhost) 1263 free(defhost); 1264 defhost = newstr("*"); 1265 #ifdef IPSEC 1266 if (policy) 1267 free(policy); 1268 policy = NULL; 1269 #endif 1270 if (fconfig != NULL) { 1271 fseek(fconfig, 0L, SEEK_SET); 1272 return (1); 1273 } 1274 fconfig = fopen(CONFIG, "r"); 1275 return (fconfig != NULL); 1276 } 1277 1278 static void 1279 endconfig(void) 1280 { 1281 if (fconfig != NULL) { 1282 (void) fclose(fconfig); 1283 fconfig = NULL; 1284 } 1285 if (defhost != NULL) { 1286 free(defhost); 1287 defhost = NULL; 1288 } 1289 } 1290 1291 static struct servtab * 1292 getconfigent(void) 1293 { 1294 struct servtab *sep = &serv; 1295 int argc, val; 1296 char *cp, *cp0, *arg, *buf0, *buf1, *sz0, *sz1; 1297 static char TCPMUX_TOKEN[] = "tcpmux/"; 1298 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) 1299 char *hostdelim; 1300 1301 more: 1302 while ((cp = nextline(fconfig))) { 1303 #ifdef IPSEC 1304 /* lines starting with #@ is not a comment, but the policy */ 1305 if (cp[0] == '#' && cp[1] == '@') { 1306 char *p; 1307 for (p = cp + 2; p && *p && isspace(*p); p++) 1308 ; 1309 if (*p == '\0') { 1310 if (policy) 1311 free(policy); 1312 policy = NULL; 1313 } else { 1314 if (ipsecsetup_test(p) < 0) { 1315 syslog(LOG_ERR, 1316 "%s: invalid ipsec policy \"%s\"", 1317 CONFIG, p); 1318 exit(1); 1319 } else { 1320 if (policy) 1321 free(policy); 1322 policy = newstr(p); 1323 } 1324 } 1325 } 1326 #endif 1327 if (*cp == '#' || *cp == '\0') 1328 continue; 1329 #ifdef MULOG 1330 /* Avoid use of `skip' if there is a danger of it looking 1331 * at continuation lines. 1332 */ 1333 do { 1334 cp++; 1335 } while (*cp == ' ' || *cp == '\t'); 1336 if (*cp == '\0') 1337 continue; 1338 if ((arg = skip(&cp)) == NULL) 1339 continue; 1340 if (strcmp(arg, "DOMAIN")) 1341 continue; 1342 if (curdom) 1343 free(curdom); 1344 curdom = NULL; 1345 while (*cp == ' ' || *cp == '\t') 1346 cp++; 1347 if (*cp == '\0') 1348 continue; 1349 arg = cp; 1350 while (*cp && *cp != ' ' && *cp != '\t') 1351 cp++; 1352 if (*cp != '\0') 1353 *cp++ = '\0'; 1354 curdom = newstr(arg); 1355 #endif 1356 break; 1357 } 1358 if (cp == NULL) 1359 return (NULL); 1360 /* 1361 * clear the static buffer, since some fields (se_ctrladdr, 1362 * for example) don't get initialized here. 1363 */ 1364 memset((caddr_t)sep, 0, sizeof *sep); 1365 arg = skip(&cp); 1366 if (cp == NULL) { 1367 /* got an empty line containing just blanks/tabs. */ 1368 goto more; 1369 } 1370 /* Check for a host name. */ 1371 hostdelim = strrchr(arg, ':'); 1372 if (hostdelim) { 1373 *hostdelim = '\0'; 1374 if (arg[0] == '[' && hostdelim > arg && hostdelim[-1] == ']') { 1375 hostdelim[-1] = '\0'; 1376 sep->se_hostaddr = newstr(arg + 1); 1377 } else 1378 sep->se_hostaddr = newstr(arg); 1379 arg = hostdelim + 1; 1380 /* 1381 * If the line is of the form `host:', then just change the 1382 * default host for the following lines. 1383 */ 1384 if (*arg == '\0') { 1385 arg = skip(&cp); 1386 if (cp == NULL) { 1387 free(defhost); 1388 defhost = sep->se_hostaddr; 1389 goto more; 1390 } 1391 } 1392 } else 1393 sep->se_hostaddr = newstr(defhost); 1394 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1395 char *c = arg + MUX_LEN; 1396 if (*c == '+') { 1397 sep->se_type = MUXPLUS_TYPE; 1398 c++; 1399 } else 1400 sep->se_type = MUX_TYPE; 1401 sep->se_service = newstr(c); 1402 } else { 1403 sep->se_service = newstr(arg); 1404 sep->se_type = NORM_TYPE; 1405 } 1406 1407 arg = sskip(&cp); 1408 if (strcmp(arg, "stream") == 0) 1409 sep->se_socktype = SOCK_STREAM; 1410 else if (strcmp(arg, "dgram") == 0) 1411 sep->se_socktype = SOCK_DGRAM; 1412 else if (strcmp(arg, "rdm") == 0) 1413 sep->se_socktype = SOCK_RDM; 1414 else if (strcmp(arg, "seqpacket") == 0) 1415 sep->se_socktype = SOCK_SEQPACKET; 1416 else if (strcmp(arg, "raw") == 0) 1417 sep->se_socktype = SOCK_RAW; 1418 else 1419 sep->se_socktype = -1; 1420 1421 arg = sskip(&cp); 1422 if (sep->se_type == NORM_TYPE && 1423 strncmp(arg, "faith/", strlen("faith/")) == 0) { 1424 arg += strlen("faith/"); 1425 sep->se_type = FAITH_TYPE; 1426 } 1427 sep->se_proto = newstr(arg); 1428 1429 #define MALFORMED(arg) \ 1430 do { \ 1431 syslog(LOG_ERR, "%s: malformed buffer size option `%s'", \ 1432 sep->se_service, (arg)); \ 1433 goto more; \ 1434 } while (0) 1435 1436 #define GETVAL(arg) \ 1437 do { \ 1438 if (!isdigit(*(arg))) \ 1439 MALFORMED(arg); \ 1440 val = strtol((arg), &cp0, 10); \ 1441 if (cp0 != NULL) { \ 1442 if (cp0[1] != '\0') \ 1443 MALFORMED((arg)); \ 1444 if (cp0[0] == 'k') \ 1445 val *= 1024; \ 1446 if (cp0[0] == 'm') \ 1447 val *= 1024 * 1024; \ 1448 } \ 1449 if (val < 1) { \ 1450 syslog(LOG_ERR, "%s: invalid buffer size `%s'", \ 1451 sep->se_service, (arg)); \ 1452 goto more; \ 1453 } \ 1454 } while (0) 1455 1456 #define ASSIGN(arg) \ 1457 do { \ 1458 if (strcmp((arg), "sndbuf") == 0) \ 1459 sep->se_sndbuf = val; \ 1460 else if (strcmp((arg), "rcvbuf") == 0) \ 1461 sep->se_rcvbuf = val; \ 1462 else \ 1463 MALFORMED((arg)); \ 1464 } while (0) 1465 1466 /* 1467 * Extract the send and receive buffer sizes before parsing 1468 * the protocol. 1469 */ 1470 sep->se_sndbuf = sep->se_rcvbuf = 0; 1471 buf0 = buf1 = sz0 = sz1 = NULL; 1472 if ((buf0 = strchr(sep->se_proto, ',')) != NULL) { 1473 /* Not meaningful for Tcpmux services. */ 1474 if (ISMUX(sep)) { 1475 syslog(LOG_ERR, "%s: can't specify buffer sizes for " 1476 "tcpmux services", sep->se_service); 1477 goto more; 1478 } 1479 1480 /* Skip the , */ 1481 *buf0++ = '\0'; 1482 1483 /* Check to see if another socket buffer size was specified. */ 1484 if ((buf1 = strchr(buf0, ',')) != NULL) { 1485 /* Skip the , */ 1486 *buf1++ = '\0'; 1487 1488 /* Make sure a 3rd one wasn't specified. */ 1489 if (strchr(buf1, ',') != NULL) { 1490 syslog(LOG_ERR, "%s: too many buffer sizes", 1491 sep->se_service); 1492 goto more; 1493 } 1494 1495 /* Locate the size. */ 1496 if ((sz1 = strchr(buf1, '=')) == NULL) 1497 MALFORMED(buf1); 1498 1499 /* Skip the = */ 1500 *sz1++ = '\0'; 1501 } 1502 1503 /* Locate the size. */ 1504 if ((sz0 = strchr(buf0, '=')) == NULL) 1505 MALFORMED(buf0); 1506 1507 /* Skip the = */ 1508 *sz0++ = '\0'; 1509 1510 GETVAL(sz0); 1511 ASSIGN(buf0); 1512 1513 if (buf1 != NULL) { 1514 GETVAL(sz1); 1515 ASSIGN(buf1); 1516 } 1517 } 1518 1519 #undef ASSIGN 1520 #undef GETVAL 1521 #undef MALFORMED 1522 1523 if (strcmp(sep->se_proto, "unix") == 0) { 1524 sep->se_family = AF_LOCAL; 1525 } else { 1526 val = strlen(sep->se_proto); 1527 if (!val) { 1528 syslog(LOG_ERR, "%s: invalid protocol specified", 1529 sep->se_service); 1530 goto more; 1531 } 1532 val = sep->se_proto[val - 1]; 1533 switch (val) { 1534 case '4': /*tcp4 or udp4*/ 1535 sep->se_family = AF_INET; 1536 break; 1537 #ifdef INET6 1538 case '6': /*tcp6 or udp6*/ 1539 sep->se_family = AF_INET6; 1540 break; 1541 #endif 1542 default: 1543 sep->se_family = AF_INET; /*will become AF_INET6*/ 1544 break; 1545 } 1546 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1547 #ifdef RPC 1548 char *cp, *ccp; 1549 cp = strchr(sep->se_service, '/'); 1550 if (cp == 0) { 1551 syslog(LOG_ERR, "%s: no rpc version", 1552 sep->se_service); 1553 goto more; 1554 } 1555 *cp++ = '\0'; 1556 sep->se_rpcversl = sep->se_rpcversh = 1557 strtol(cp, &ccp, 0); 1558 if (ccp == cp) { 1559 badafterall: 1560 syslog(LOG_ERR, "%s/%s: bad rpc version", 1561 sep->se_service, cp); 1562 goto more; 1563 } 1564 if (*ccp == '-') { 1565 cp = ccp + 1; 1566 sep->se_rpcversh = strtol(cp, &ccp, 0); 1567 if (ccp == cp) 1568 goto badafterall; 1569 } 1570 #else 1571 syslog(LOG_ERR, "%s: rpc services not suported", 1572 sep->se_service); 1573 goto more; 1574 #endif /* RPC */ 1575 } 1576 } 1577 arg = sskip(&cp); 1578 { 1579 char *cp; 1580 if ((cp = strchr(arg, ':')) == NULL) 1581 cp = strchr(arg, '.'); 1582 if (cp != NULL) { 1583 *cp++ = '\0'; 1584 sep->se_max = atoi(cp); 1585 } else 1586 sep->se_max = TOOMANY; 1587 } 1588 sep->se_wait = strcmp(arg, "wait") == 0; 1589 if (ISMUX(sep)) { 1590 /* 1591 * Silently enforce "nowait" for TCPMUX services since 1592 * they don't have an assigned port to listen on. 1593 */ 1594 sep->se_wait = 0; 1595 1596 if (strncmp(sep->se_proto, "tcp", 3)) { 1597 syslog(LOG_ERR, 1598 "%s: bad protocol for tcpmux service %s", 1599 CONFIG, sep->se_service); 1600 goto more; 1601 } 1602 if (sep->se_socktype != SOCK_STREAM) { 1603 syslog(LOG_ERR, 1604 "%s: bad socket type for tcpmux service %s", 1605 CONFIG, sep->se_service); 1606 goto more; 1607 } 1608 } 1609 sep->se_user = newstr(sskip(&cp)); 1610 if ((sep->se_group = strchr(sep->se_user, ':')) != NULL) 1611 *sep->se_group++ = '\0'; 1612 else if ((sep->se_group = strchr(sep->se_user, '.')) != NULL) 1613 *sep->se_group++ = '\0'; 1614 1615 sep->se_server = newstr(sskip(&cp)); 1616 if (strcmp(sep->se_server, "internal") == 0) { 1617 struct biltin *bi; 1618 1619 for (bi = biltins; bi->bi_service; bi++) 1620 if (bi->bi_socktype == sep->se_socktype && 1621 strcmp(bi->bi_service, sep->se_service) == 0) 1622 break; 1623 if (bi->bi_service == 0) { 1624 syslog(LOG_ERR, "internal service %s unknown", 1625 sep->se_service); 1626 goto more; 1627 } 1628 sep->se_bi = bi; 1629 sep->se_wait = bi->bi_wait; 1630 } else 1631 sep->se_bi = NULL; 1632 argc = 0; 1633 for (arg = skip(&cp); cp; arg = skip(&cp)) { 1634 #if MULOG 1635 char *colon; 1636 1637 if (argc == 0 && (colon = strrchr(arg, ':'))) { 1638 while (arg < colon) { 1639 int x; 1640 char *ccp; 1641 1642 switch (*arg++) { 1643 case 'l': 1644 x = 1; 1645 if (isdigit(*arg)) { 1646 x = strtol(arg, &ccp, 0); 1647 if (ccp == arg) 1648 break; 1649 arg = ccp; 1650 } 1651 sep->se_log &= ~MULOG_RFC931; 1652 sep->se_log |= x; 1653 break; 1654 case 'a': 1655 sep->se_log |= MULOG_RFC931; 1656 break; 1657 default: 1658 break; 1659 } 1660 } 1661 arg = colon + 1; 1662 } 1663 #endif 1664 if (argc < MAXARGV) 1665 sep->se_argv[argc++] = newstr(arg); 1666 } 1667 while (argc <= MAXARGV) 1668 sep->se_argv[argc++] = NULL; 1669 #ifdef IPSEC 1670 sep->se_policy = policy ? newstr(policy) : NULL; 1671 #endif 1672 return (sep); 1673 } 1674 1675 static void 1676 freeconfig(struct servtab *cp) 1677 { 1678 int i; 1679 1680 if (cp->se_hostaddr) 1681 free(cp->se_hostaddr); 1682 if (cp->se_service) 1683 free(cp->se_service); 1684 if (cp->se_proto) 1685 free(cp->se_proto); 1686 if (cp->se_user) 1687 free(cp->se_user); 1688 /* Note: se_group is part of the newstr'ed se_user */ 1689 if (cp->se_server) 1690 free(cp->se_server); 1691 for (i = 0; i < MAXARGV; i++) 1692 if (cp->se_argv[i]) 1693 free(cp->se_argv[i]); 1694 #ifdef IPSEC 1695 if (cp->se_policy) 1696 free(cp->se_policy); 1697 #endif 1698 } 1699 1700 1701 /* 1702 * Safe skip - if skip returns null, log a syntax error in the 1703 * configuration file and exit. 1704 */ 1705 static char * 1706 sskip(char **cpp) 1707 { 1708 char *cp; 1709 1710 cp = skip(cpp); 1711 if (cp == NULL) { 1712 syslog(LOG_ERR, "%s: syntax error", CONFIG); 1713 exit(1); 1714 } 1715 return (cp); 1716 } 1717 1718 static char * 1719 skip(char **cpp) 1720 { 1721 char *cp = *cpp; 1722 char *start; 1723 1724 if (*cpp == NULL) 1725 return (NULL); 1726 1727 again: 1728 while (*cp == ' ' || *cp == '\t') 1729 cp++; 1730 if (*cp == '\0') { 1731 int c; 1732 1733 c = getc(fconfig); 1734 (void) ungetc(c, fconfig); 1735 if (c == ' ' || c == '\t') 1736 if ((cp = nextline(fconfig))) 1737 goto again; 1738 *cpp = NULL; 1739 return (NULL); 1740 } 1741 start = cp; 1742 while (*cp && *cp != ' ' && *cp != '\t') 1743 cp++; 1744 if (*cp != '\0') 1745 *cp++ = '\0'; 1746 *cpp = cp; 1747 return (start); 1748 } 1749 1750 static char * 1751 nextline(FILE *fd) 1752 { 1753 char *cp; 1754 1755 if (fgets(line, sizeof (line), fd) == NULL) 1756 return (NULL); 1757 cp = strchr(line, '\n'); 1758 if (cp) 1759 *cp = '\0'; 1760 return (line); 1761 } 1762 1763 static char * 1764 newstr(char *cp) 1765 { 1766 if ((cp = strdup((cp !=NULL )? cp : "")) != NULL) 1767 return (cp); 1768 syslog(LOG_ERR, "strdup: %m"); 1769 exit(1); 1770 } 1771 1772 static void 1773 inetd_setproctitle(char *a, int s) 1774 { 1775 socklen_t size; 1776 struct sockaddr_storage ss; 1777 char hbuf[NI_MAXHOST]; 1778 1779 size = sizeof(ss); 1780 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) { 1781 if (getnameinfo((struct sockaddr *)&ss, size, hbuf, 1782 sizeof(hbuf), NULL, 0, niflags) == 0) 1783 setproctitle("-%s [%s]", a, hbuf); 1784 else 1785 setproctitle("-%s [?]", a); 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 strcpy(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 v4chk: 2452 if (IN_MULTICAST(in.s_addr)) 2453 goto bad; 2454 switch ((in.s_addr & 0xff000000) >> 24) { 2455 case 0: case 127: case 255: 2456 goto bad; 2457 } 2458 if (dg_broadcast(&in)) 2459 goto bad; 2460 break; 2461 #ifdef INET6 2462 case AF_INET6: 2463 in6 = &((struct sockaddr_in6 *)sa)->sin6_addr; 2464 port = ntohs(((struct sockaddr_in6 *)sa)->sin6_port); 2465 if (IN6_IS_ADDR_MULTICAST(in6) || IN6_IS_ADDR_UNSPECIFIED(in6)) 2466 goto bad; 2467 if (IN6_IS_ADDR_V4MAPPED(in6) || IN6_IS_ADDR_V4COMPAT(in6)) { 2468 memcpy(&in, &in6->s6_addr[12], sizeof(in)); 2469 in.s_addr = ntohl(in.s_addr); 2470 goto v4chk; 2471 } 2472 break; 2473 #endif 2474 default: 2475 /* XXX unsupported af, is it safe to assume it to be safe? */ 2476 return (1); 2477 } 2478 2479 for (i = 0; bad_ports[i] != 0; i++) { 2480 if (port == bad_ports[i]) 2481 goto bad; 2482 } 2483 2484 return (1); 2485 2486 bad: 2487 if (getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), NULL, 0, 2488 niflags) != 0) 2489 strcpy(hbuf, "?"); 2490 syslog(LOG_WARNING,"Possible DoS attack from %s, Port %d", 2491 hbuf, port); 2492 return (0); 2493 } 2494 2495 /* XXX need optimization */ 2496 static int 2497 dg_broadcast(struct in_addr *in) 2498 { 2499 struct ifaddrs *ifa, *ifap; 2500 struct sockaddr_in *sin; 2501 2502 if (getifaddrs(&ifap) < 0) 2503 return (0); 2504 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 2505 if (ifa->ifa_addr->sa_family != AF_INET || 2506 (ifa->ifa_flags & IFF_BROADCAST) == 0) 2507 continue; 2508 sin = (struct sockaddr_in *)ifa->ifa_broadaddr; 2509 if (sin->sin_addr.s_addr == in->s_addr) { 2510 freeifaddrs(ifap); 2511 return (1); 2512 } 2513 } 2514 freeifaddrs(ifap); 2515 return (0); 2516 } 2517 2518 static int 2519 my_kevent(const struct kevent *changelist, size_t nchanges, 2520 struct kevent *eventlist, size_t nevents) 2521 { 2522 int result; 2523 2524 while ((result = kevent(kq, changelist, nchanges, eventlist, nevents, 2525 NULL)) < 0) 2526 if (errno != EINTR) { 2527 syslog(LOG_ERR, "kevent: %m"); 2528 exit(EXIT_FAILURE); 2529 } 2530 2531 return (result); 2532 } 2533 2534 static struct kevent * 2535 allocchange(void) 2536 { 2537 if (changes == A_CNT(changebuf)) { 2538 (void) my_kevent(changebuf, A_CNT(changebuf), NULL, 0); 2539 changes = 0; 2540 } 2541 2542 return (&changebuf[changes++]); 2543 } 2544
Indexes created Fri Sep 26 08:10:20 GMT 2025