inetd.c revision 1.88
1 /* $NetBSD: inetd.c,v 1.88 2003/02/16 17:57:34 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 1.88 2003/02/16 17:57:34 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 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[] = 450 { SIGALRM, SIGHUP, SIGCHLD, SIGTERM, SIGINT, SIGPIPE }; 451 452 int 453 main(int argc, char *argv[]) 454 { 455 int ch, n, reload = 1; 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 int signum; 507 508 signum = my_signals[n]; 509 (void) signal(signum, SIG_IGN); 510 511 if (signum != SIGPIPE) { 512 struct kevent *ev; 513 514 ev = allocchange(); 515 EV_SET(ev, signum, EVFILT_SIGNAL, EV_ADD | EV_ENABLE, 516 0, 0, NULL); 517 } 518 } 519 520 for (;;) { 521 int ctrl; 522 struct kevent eventbuf[64], *ev; 523 struct servtab *sep; 524 525 if (reload) { 526 reload = 0; 527 config(); 528 } 529 530 n = my_kevent(changebuf, changes, eventbuf, A_CNT(eventbuf)); 531 changes = 0; 532 533 for (ev = eventbuf; n > 0; ev++, n--) { 534 if (ev->filter == EVFILT_SIGNAL) { 535 switch (ev->ident) { 536 case SIGALRM: 537 retry(); 538 break; 539 case SIGCHLD: 540 reapchild(); 541 break; 542 case SIGTERM: 543 case SIGINT: 544 goaway(); 545 break; 546 case SIGHUP: 547 reload = 1; 548 break; 549 } 550 continue; 551 } 552 if (ev->filter != EVFILT_READ) 553 continue; 554 sep = (struct servtab *)ev->udata; 555 /* Paranoia */ 556 if (ev->ident != sep->se_fd) 557 continue; 558 if (debug) 559 fprintf(stderr, "someone wants %s\n", sep->se_service); 560 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 561 /* XXX here do the libwrap check-before-accept */ 562 ctrl = accept(sep->se_fd, NULL, NULL); 563 if (debug) 564 fprintf(stderr, "accept, ctrl %d\n", 565 ctrl); 566 if (ctrl < 0) { 567 if (errno != EINTR) 568 syslog(LOG_WARNING, 569 "accept (for %s): %m", 570 sep->se_service); 571 continue; 572 } 573 } else 574 ctrl = sep->se_fd; 575 (void) sigblock(SIGBLOCK); 576 spawn(sep, ctrl); 577 } 578 } 579 } 580 581 static void 582 spawn(struct servtab *sep, int ctrl) 583 { 584 int dofork; 585 pid_t pid; 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 } 636 if (pid == 0) { 637 int n; 638 639 for (n = 0; n < A_CNT(my_signals); n++) 640 (void) signal(my_signals[n], SIG_DFL); 641 if (debug) 642 setsid(); 643 } 644 } 645 sigsetmask(0L); 646 if (pid == 0) { 647 run_service(ctrl, sep); 648 if (dofork) 649 exit(0); 650 } 651 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 652 close(ctrl); 653 } 654 655 static void 656 run_service(int ctrl, struct servtab *sep) 657 { 658 struct passwd *pwd; 659 struct group *grp = NULL; /* XXX gcc */ 660 char buf[NI_MAXSERV]; 661 #ifdef LIBWRAP 662 struct request_info req; 663 int denied; 664 char *service = NULL; /* XXX gcc */ 665 #endif 666 667 #ifdef LIBWRAP 668 #ifndef LIBWRAP_INTERNAL 669 if (sep->se_bi == 0) 670 #endif 671 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 672 request_init(&req, RQ_DAEMON, sep->se_argv[0] ? 673 sep->se_argv[0] : sep->se_service, RQ_FILE, ctrl, NULL); 674 fromhost(&req); 675 denied = !hosts_access(&req); 676 if (denied || lflag) { 677 if (getnameinfo(&sep->se_ctrladdr, 678 sep->se_ctrladdr.sa_len, NULL, 0, 679 buf, sizeof(buf), 0) != 0) { 680 /* shouldn't happen */ 681 (void)snprintf(buf, sizeof buf, "%d", 682 ntohs(sep->se_ctrladdr_in.sin_port)); 683 } 684 service = buf; 685 } 686 if (denied) { 687 syslog(deny_severity, 688 "refused connection from %.500s, service %s (%s)", 689 eval_client(&req), service, sep->se_proto); 690 goto reject; 691 } 692 if (lflag) { 693 syslog(allow_severity, 694 "connection from %.500s, service %s (%s)", 695 eval_client(&req), service, sep->se_proto); 696 } 697 } 698 #endif /* LIBWRAP */ 699 700 if (sep->se_bi) { 701 (*sep->se_bi->bi_fn)(ctrl, sep); 702 } else { 703 if ((pwd = getpwnam(sep->se_user)) == NULL) { 704 syslog(LOG_ERR, "%s/%s: %s: No such user", 705 sep->se_service, sep->se_proto, sep->se_user); 706 goto reject; 707 } 708 if (sep->se_group && 709 (grp = getgrnam(sep->se_group)) == NULL) { 710 syslog(LOG_ERR, "%s/%s: %s: No such group", 711 sep->se_service, sep->se_proto, sep->se_group); 712 goto reject; 713 } 714 if (pwd->pw_uid) { 715 if (sep->se_group) 716 pwd->pw_gid = grp->gr_gid; 717 if (setgid(pwd->pw_gid) < 0) { 718 syslog(LOG_ERR, 719 "%s/%s: can't set gid %d: %m", sep->se_service, 720 sep->se_proto, pwd->pw_gid); 721 goto reject; 722 } 723 (void) initgroups(pwd->pw_name, 724 pwd->pw_gid); 725 if (setuid(pwd->pw_uid) < 0) { 726 syslog(LOG_ERR, 727 "%s/%s: can't set uid %d: %m", sep->se_service, 728 sep->se_proto, pwd->pw_uid); 729 goto reject; 730 } 731 } else if (sep->se_group) { 732 (void) setgid((gid_t)grp->gr_gid); 733 } 734 if (debug) 735 fprintf(stderr, "%d execl %s\n", 736 getpid(), sep->se_server); 737 #ifdef MULOG 738 if (sep->se_log) 739 dolog(sep, ctrl); 740 #endif 741 /* Set our control descriptor to not close-on-exec... */ 742 if (fcntl(ctrl, F_SETFD, 0) < 0) 743 syslog(LOG_ERR, "fcntl (F_SETFD, 0): %m"); 744 /* ...and dup it to stdin, stdout, and stderr. */ 745 if (ctrl != 0) { 746 dup2(ctrl, 0); 747 close(ctrl); 748 ctrl = 0; 749 } 750 dup2(0, 1); 751 dup2(0, 2); 752 #ifdef RLIMIT_NOFILE 753 if (rlim_ofile.rlim_cur != rlim_ofile_cur && 754 setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) 755 syslog(LOG_ERR, "setrlimit: %m"); 756 #endif 757 execv(sep->se_server, sep->se_argv); 758 syslog(LOG_ERR, "cannot execute %s: %m", sep->se_server); 759 reject: 760 if (sep->se_socktype != SOCK_STREAM) 761 recv(ctrl, buf, sizeof (buf), 0); 762 _exit(1); 763 } 764 } 765 766 static void 767 reapchild(void) 768 { 769 int status; 770 pid_t pid; 771 struct servtab *sep; 772 773 for (;;) { 774 pid = wait3(&status, WNOHANG, NULL); 775 if (pid <= 0) 776 break; 777 if (debug) 778 (void) fprintf(stderr, "%d reaped, status %#x\n", 779 pid, status); 780 for (sep = servtab; sep != NULL; sep = sep->se_next) 781 if (sep->se_wait == pid) { 782 struct kevent *ev; 783 784 if (WIFEXITED(status) && WEXITSTATUS(status)) 785 syslog(LOG_WARNING, 786 "%s: exit status 0x%x", 787 sep->se_server, WEXITSTATUS(status)); 788 else if (WIFSIGNALED(status)) 789 syslog(LOG_WARNING, 790 "%s: exit signal 0x%x", 791 sep->se_server, WTERMSIG(status)); 792 sep->se_wait = 1; 793 ev = allocchange(); 794 EV_SET(ev, sep->se_fd, EVFILT_READ, 795 EV_ADD | EV_ENABLE, 0, 0, (intptr_t)sep); 796 if (debug) 797 fprintf(stderr, "restored %s, fd %d\n", 798 sep->se_service, sep->se_fd); 799 } 800 } 801 } 802 803 static void 804 config(void) 805 { 806 struct servtab *sep, *cp, **sepp; 807 long omask; 808 int n; 809 810 if (!setconfig()) { 811 syslog(LOG_ERR, "%s: %m", CONFIG); 812 return; 813 } 814 for (sep = servtab; sep != NULL; sep = sep->se_next) 815 sep->se_checked = 0; 816 while ((cp = getconfigent())) { 817 for (sep = servtab; sep != NULL; sep = sep->se_next) 818 if (strcmp(sep->se_service, cp->se_service) == 0 && 819 strcmp(sep->se_hostaddr, cp->se_hostaddr) == 0 && 820 strcmp(sep->se_proto, cp->se_proto) == 0 && 821 ISMUX(sep) == ISMUX(cp)) 822 break; 823 if (sep != NULL) { 824 int i; 825 826 #define SWAP(type, a, b) {type c=(type)a; (type)a=(type)b; (type)b=(type)c;} 827 828 omask = sigblock(SIGBLOCK); 829 /* 830 * sep->se_wait may be holding the pid of a daemon 831 * that we're waiting for. If so, don't overwrite 832 * it unless the config file explicitly says don't 833 * wait. 834 */ 835 if (cp->se_bi == 0 && 836 (sep->se_wait == 1 || cp->se_wait == 0)) 837 sep->se_wait = cp->se_wait; 838 SWAP(char *, sep->se_user, cp->se_user); 839 SWAP(char *, sep->se_group, cp->se_group); 840 SWAP(char *, sep->se_server, cp->se_server); 841 for (i = 0; i < MAXARGV; i++) 842 SWAP(char *, sep->se_argv[i], cp->se_argv[i]); 843 #ifdef IPSEC 844 SWAP(char *, sep->se_policy, cp->se_policy); 845 #endif 846 SWAP(int, cp->se_type, sep->se_type); 847 SWAP(int, cp->se_max, sep->se_max); 848 #undef SWAP 849 if (isrpcservice(sep)) 850 unregister_rpc(sep); 851 sep->se_rpcversl = cp->se_rpcversl; 852 sep->se_rpcversh = cp->se_rpcversh; 853 sigsetmask(omask); 854 freeconfig(cp); 855 if (debug) 856 print_service("REDO", sep); 857 } else { 858 sep = enter(cp); 859 if (debug) 860 print_service("ADD ", sep); 861 } 862 sep->se_checked = 1; 863 864 switch (sep->se_family) { 865 case AF_LOCAL: 866 if (sep->se_fd != -1) 867 break; 868 n = strlen(sep->se_service); 869 if (n > sizeof(sep->se_ctrladdr_un.sun_path)) { 870 syslog(LOG_ERR, "%s: address too long", 871 sep->se_service); 872 sep->se_checked = 0; 873 continue; 874 } 875 (void)unlink(sep->se_service); 876 strncpy(sep->se_ctrladdr_un.sun_path, 877 sep->se_service, n); 878 sep->se_ctrladdr_un.sun_family = AF_LOCAL; 879 sep->se_ctrladdr_size = n + 880 sizeof(sep->se_ctrladdr_un) - 881 sizeof(sep->se_ctrladdr_un.sun_path); 882 if (!ISMUX(sep)) 883 setup(sep); 884 break; 885 case AF_INET: 886 #ifdef INET6 887 case AF_INET6: 888 #endif 889 { 890 struct addrinfo hints, *res; 891 char *host, *port; 892 int error; 893 int s; 894 895 /* check if the family is supported */ 896 s = socket(sep->se_family, SOCK_DGRAM, 0); 897 if (s < 0) { 898 syslog(LOG_WARNING, 899 "%s/%s: %s: the address family is not supported by the kernel", 900 sep->se_service, sep->se_proto, 901 sep->se_hostaddr); 902 sep->se_checked = 0; 903 continue; 904 } 905 close(s); 906 907 memset(&hints, 0, sizeof(hints)); 908 hints.ai_family = sep->se_family; 909 hints.ai_socktype = sep->se_socktype; 910 hints.ai_flags = AI_PASSIVE; 911 if (!strcmp(sep->se_hostaddr, "*")) 912 host = NULL; 913 else 914 host = sep->se_hostaddr; 915 if (isrpcservice(sep) || ISMUX(sep)) 916 port = "0"; 917 else 918 port = sep->se_service; 919 error = getaddrinfo(host, port, &hints, &res); 920 if (error) { 921 if (error == EAI_SERVICE) { 922 /* gai_strerror not friendly enough */ 923 syslog(LOG_WARNING, "%s/%s: " 924 "unknown service", 925 sep->se_service, sep->se_proto); 926 } else { 927 syslog(LOG_ERR, "%s/%s: %s: %s", 928 sep->se_service, sep->se_proto, 929 sep->se_hostaddr, 930 gai_strerror(error)); 931 } 932 sep->se_checked = 0; 933 continue; 934 } 935 if (res->ai_next) { 936 syslog(LOG_ERR, 937 "%s/%s: %s: resolved to multiple addr", 938 sep->se_service, sep->se_proto, 939 sep->se_hostaddr); 940 sep->se_checked = 0; 941 freeaddrinfo(res); 942 continue; 943 } 944 memcpy(&sep->se_ctrladdr, res->ai_addr, 945 res->ai_addrlen); 946 if (ISMUX(sep)) { 947 sep->se_fd = -1; 948 freeaddrinfo(res); 949 continue; 950 } 951 sep->se_ctrladdr_size = res->ai_addrlen; 952 freeaddrinfo(res); 953 #ifdef RPC 954 if (isrpcservice(sep)) { 955 struct rpcent *rp; 956 957 sep->se_rpcprog = atoi(sep->se_service); 958 if (sep->se_rpcprog == 0) { 959 rp = getrpcbyname(sep->se_service); 960 if (rp == 0) { 961 syslog(LOG_ERR, 962 "%s/%s: unknown service", 963 sep->se_service, 964 sep->se_proto); 965 sep->se_checked = 0; 966 continue; 967 } 968 sep->se_rpcprog = rp->r_number; 969 } 970 if (sep->se_fd == -1 && !ISMUX(sep)) 971 setup(sep); 972 if (sep->se_fd != -1) 973 register_rpc(sep); 974 } else 975 #endif 976 { 977 if (sep->se_fd >= 0) 978 close_sep(sep); 979 if (sep->se_fd == -1 && !ISMUX(sep)) 980 setup(sep); 981 } 982 } 983 } 984 } 985 endconfig(); 986 /* 987 * Purge anything not looked at above. 988 */ 989 omask = sigblock(SIGBLOCK); 990 sepp = &servtab; 991 while ((sep = *sepp)) { 992 if (sep->se_checked) { 993 sepp = &sep->se_next; 994 continue; 995 } 996 *sepp = sep->se_next; 997 if (sep->se_fd >= 0) 998 close_sep(sep); 999 if (isrpcservice(sep)) 1000 unregister_rpc(sep); 1001 if (sep->se_family == AF_LOCAL) 1002 (void)unlink(sep->se_service); 1003 if (debug) 1004 print_service("FREE", sep); 1005 freeconfig(sep); 1006 free(sep); 1007 } 1008 (void) sigsetmask(omask); 1009 } 1010 1011 static void 1012 retry(void) 1013 { 1014 struct servtab *sep; 1015 1016 timingout = 0; 1017 for (sep = servtab; sep != NULL; sep = sep->se_next) { 1018 if (sep->se_fd == -1 && !ISMUX(sep)) { 1019 switch (sep->se_family) { 1020 case AF_LOCAL: 1021 case AF_INET: 1022 #ifdef INET6 1023 case AF_INET6: 1024 #endif 1025 setup(sep); 1026 if (sep->se_fd != -1 && isrpcservice(sep)) 1027 register_rpc(sep); 1028 break; 1029 } 1030 } 1031 } 1032 } 1033 1034 static void 1035 goaway(void) 1036 { 1037 struct servtab *sep; 1038 1039 for (sep = servtab; sep != NULL; sep = sep->se_next) { 1040 if (sep->se_fd == -1) 1041 continue; 1042 1043 switch (sep->se_family) { 1044 case AF_LOCAL: 1045 (void)unlink(sep->se_service); 1046 break; 1047 case AF_INET: 1048 #ifdef INET6 1049 case AF_INET6: 1050 #endif 1051 if (sep->se_wait == 1 && isrpcservice(sep)) 1052 unregister_rpc(sep); 1053 break; 1054 } 1055 (void)close(sep->se_fd); 1056 } 1057 exit(0); 1058 } 1059 1060 static void 1061 setup(struct servtab *sep) 1062 { 1063 int on = 1; 1064 struct kevent *ev; 1065 1066 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) { 1067 if (debug) 1068 fprintf(stderr, "socket failed on %s/%s: %s\n", 1069 sep->se_service, sep->se_proto, strerror(errno)); 1070 syslog(LOG_ERR, "%s/%s: socket: %m", 1071 sep->se_service, sep->se_proto); 1072 return; 1073 } 1074 /* Set all listening sockets to close-on-exec. */ 1075 if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) { 1076 syslog(LOG_ERR, "%s/%s: fcntl(F_SETFD, FD_CLOEXEC): %m", 1077 sep->se_service, sep->se_proto); 1078 close(sep->se_fd); 1079 return; 1080 } 1081 1082 #define turnon(fd, opt) \ 1083 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 1084 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 1085 turnon(sep->se_fd, SO_DEBUG) < 0) 1086 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 1087 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 1088 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 1089 #undef turnon 1090 1091 /* Set the socket buffer sizes, if specified. */ 1092 if (sep->se_sndbuf != 0 && setsockopt(sep->se_fd, SOL_SOCKET, 1093 SO_SNDBUF, (char *)&sep->se_sndbuf, sizeof(sep->se_sndbuf)) < 0) 1094 syslog(LOG_ERR, "setsockopt (SO_SNDBUF %d): %m", 1095 sep->se_sndbuf); 1096 if (sep->se_rcvbuf != 0 && setsockopt(sep->se_fd, SOL_SOCKET, 1097 SO_RCVBUF, (char *)&sep->se_rcvbuf, sizeof(sep->se_rcvbuf)) < 0) 1098 syslog(LOG_ERR, "setsockopt (SO_RCVBUF %d): %m", 1099 sep->se_rcvbuf); 1100 if (sep->se_type == FAITH_TYPE && setsockopt(sep->se_fd, IPPROTO_IPV6, 1101 IPV6_FAITH, (char *)&on, sizeof(on)) < 0) 1102 syslog(LOG_ERR, "setsockopt (IPV6_FAITH): %m"); 1103 #ifdef IPSEC 1104 if (ipsecsetup(sep->se_family, sep->se_fd, sep->se_policy) < 0 && 1105 sep->se_policy) { 1106 syslog(LOG_ERR, "%s/%s: ipsec setup failed", 1107 sep->se_service, sep->se_proto); 1108 (void)close(sep->se_fd); 1109 sep->se_fd = -1; 1110 return; 1111 } 1112 #endif 1113 1114 if (bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size) < 0) { 1115 if (debug) 1116 fprintf(stderr, "bind failed on %s/%s: %s\n", 1117 sep->se_service, sep->se_proto, strerror(errno)); 1118 syslog(LOG_ERR, "%s/%s: bind: %m", 1119 sep->se_service, sep->se_proto); 1120 (void) close(sep->se_fd); 1121 sep->se_fd = -1; 1122 if (!timingout) { 1123 timingout = 1; 1124 alarm(RETRYTIME); 1125 } 1126 return; 1127 } 1128 if (sep->se_socktype == SOCK_STREAM) 1129 listen(sep->se_fd, 10); 1130 1131 ev = allocchange(); 1132 EV_SET(ev, sep->se_fd, EVFILT_READ, EV_ADD | EV_ENABLE, 0, 0, 1133 (intptr_t)sep); 1134 if (sep->se_fd > maxsock) { 1135 maxsock = sep->se_fd; 1136 if (maxsock > rlim_ofile_cur - FD_MARGIN) 1137 bump_nofile(); 1138 } 1139 if (debug) 1140 fprintf(stderr, "registered %s on %d\n", 1141 sep->se_server, sep->se_fd); 1142 } 1143 1144 /* 1145 * Finish with a service and its socket. 1146 */ 1147 static void 1148 close_sep(struct servtab *sep) 1149 { 1150 if (sep->se_fd >= 0) { 1151 (void) close(sep->se_fd); 1152 sep->se_fd = -1; 1153 } 1154 sep->se_count = 0; 1155 } 1156 1157 static void 1158 register_rpc(struct servtab *sep) 1159 { 1160 #ifdef RPC 1161 int n; 1162 struct netbuf nbuf; 1163 struct sockaddr_storage ss; 1164 struct netconfig *nconf; 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 n = sizeof ss; 1172 if (getsockname(sep->se_fd, (struct sockaddr *)&ss, &n) < 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 long omask; 1225 1226 sep = (struct servtab *)malloc(sizeof (*sep)); 1227 if (sep == NULL) { 1228 syslog(LOG_ERR, "Out of memory."); 1229 exit(1); 1230 } 1231 *sep = *cp; 1232 sep->se_fd = -1; 1233 sep->se_rpcprog = -1; 1234 omask = sigblock(SIGBLOCK); 1235 sep->se_next = servtab; 1236 servtab = sep; 1237 sigsetmask(omask); 1238 return (sep); 1239 } 1240 1241 FILE *fconfig = NULL; 1242 struct servtab serv; 1243 char line[LINE_MAX]; 1244 char *defhost; 1245 #ifdef IPSEC 1246 static char *policy = NULL; 1247 #endif 1248 1249 static int 1250 setconfig(void) 1251 { 1252 if (defhost) 1253 free(defhost); 1254 defhost = newstr("*"); 1255 #ifdef IPSEC 1256 if (policy) 1257 free(policy); 1258 policy = NULL; 1259 #endif 1260 if (fconfig != NULL) { 1261 fseek(fconfig, 0L, SEEK_SET); 1262 return (1); 1263 } 1264 fconfig = fopen(CONFIG, "r"); 1265 return (fconfig != NULL); 1266 } 1267 1268 static void 1269 endconfig(void) 1270 { 1271 if (fconfig != NULL) { 1272 (void) fclose(fconfig); 1273 fconfig = NULL; 1274 } 1275 if (defhost != NULL) { 1276 free(defhost); 1277 defhost = NULL; 1278 } 1279 } 1280 1281 static struct servtab * 1282 getconfigent(void) 1283 { 1284 struct servtab *sep = &serv; 1285 int argc, val; 1286 char *cp, *cp0, *arg, *buf0, *buf1, *sz0, *sz1; 1287 static char TCPMUX_TOKEN[] = "tcpmux/"; 1288 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) 1289 char *hostdelim; 1290 1291 more: 1292 while ((cp = nextline(fconfig))) { 1293 #ifdef IPSEC 1294 /* lines starting with #@ is not a comment, but the policy */ 1295 if (cp[0] == '#' && cp[1] == '@') { 1296 char *p; 1297 for (p = cp + 2; p && *p && isspace(*p); p++) 1298 ; 1299 if (*p == '\0') { 1300 if (policy) 1301 free(policy); 1302 policy = NULL; 1303 } else { 1304 if (ipsecsetup_test(p) < 0) { 1305 syslog(LOG_ERR, 1306 "%s: invalid ipsec policy \"%s\"", 1307 CONFIG, p); 1308 exit(1); 1309 } else { 1310 if (policy) 1311 free(policy); 1312 policy = newstr(p); 1313 } 1314 } 1315 } 1316 #endif 1317 if (*cp == '#' || *cp == '\0') 1318 continue; 1319 #ifdef MULOG 1320 /* Avoid use of `skip' if there is a danger of it looking 1321 * at continuation lines. 1322 */ 1323 do { 1324 cp++; 1325 } while (*cp == ' ' || *cp == '\t'); 1326 if (*cp == '\0') 1327 continue; 1328 if ((arg = skip(&cp)) == NULL) 1329 continue; 1330 if (strcmp(arg, "DOMAIN")) 1331 continue; 1332 if (curdom) 1333 free(curdom); 1334 curdom = NULL; 1335 while (*cp == ' ' || *cp == '\t') 1336 cp++; 1337 if (*cp == '\0') 1338 continue; 1339 arg = cp; 1340 while (*cp && *cp != ' ' && *cp != '\t') 1341 cp++; 1342 if (*cp != '\0') 1343 *cp++ = '\0'; 1344 curdom = newstr(arg); 1345 #endif 1346 break; 1347 } 1348 if (cp == NULL) 1349 return (NULL); 1350 /* 1351 * clear the static buffer, since some fields (se_ctrladdr, 1352 * for example) don't get initialized here. 1353 */ 1354 memset((caddr_t)sep, 0, sizeof *sep); 1355 arg = skip(&cp); 1356 if (cp == NULL) { 1357 /* got an empty line containing just blanks/tabs. */ 1358 goto more; 1359 } 1360 /* Check for a host name. */ 1361 hostdelim = strrchr(arg, ':'); 1362 if (hostdelim) { 1363 *hostdelim = '\0'; 1364 if (arg[0] == '[' && hostdelim > arg && hostdelim[-1] == ']') { 1365 hostdelim[-1] = '\0'; 1366 sep->se_hostaddr = newstr(arg + 1); 1367 } else 1368 sep->se_hostaddr = newstr(arg); 1369 arg = hostdelim + 1; 1370 /* 1371 * If the line is of the form `host:', then just change the 1372 * default host for the following lines. 1373 */ 1374 if (*arg == '\0') { 1375 arg = skip(&cp); 1376 if (cp == NULL) { 1377 free(defhost); 1378 defhost = sep->se_hostaddr; 1379 goto more; 1380 } 1381 } 1382 } else 1383 sep->se_hostaddr = newstr(defhost); 1384 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1385 char *c = arg + MUX_LEN; 1386 if (*c == '+') { 1387 sep->se_type = MUXPLUS_TYPE; 1388 c++; 1389 } else 1390 sep->se_type = MUX_TYPE; 1391 sep->se_service = newstr(c); 1392 } else { 1393 sep->se_service = newstr(arg); 1394 sep->se_type = NORM_TYPE; 1395 } 1396 1397 arg = sskip(&cp); 1398 if (strcmp(arg, "stream") == 0) 1399 sep->se_socktype = SOCK_STREAM; 1400 else if (strcmp(arg, "dgram") == 0) 1401 sep->se_socktype = SOCK_DGRAM; 1402 else if (strcmp(arg, "rdm") == 0) 1403 sep->se_socktype = SOCK_RDM; 1404 else if (strcmp(arg, "seqpacket") == 0) 1405 sep->se_socktype = SOCK_SEQPACKET; 1406 else if (strcmp(arg, "raw") == 0) 1407 sep->se_socktype = SOCK_RAW; 1408 else 1409 sep->se_socktype = -1; 1410 1411 arg = sskip(&cp); 1412 if (sep->se_type == NORM_TYPE && 1413 strncmp(arg, "faith/", strlen("faith/")) == 0) { 1414 arg += strlen("faith/"); 1415 sep->se_type = FAITH_TYPE; 1416 } 1417 sep->se_proto = newstr(arg); 1418 1419 #define MALFORMED(arg) \ 1420 do { \ 1421 syslog(LOG_ERR, "%s: malformed buffer size option `%s'", \ 1422 sep->se_service, (arg)); \ 1423 goto more; \ 1424 } while (0) 1425 1426 #define GETVAL(arg) \ 1427 do { \ 1428 if (!isdigit(*(arg))) \ 1429 MALFORMED(arg); \ 1430 val = strtol((arg), &cp0, 10); \ 1431 if (cp0 != NULL) { \ 1432 if (cp0[1] != '\0') \ 1433 MALFORMED((arg)); \ 1434 if (cp0[0] == 'k') \ 1435 val *= 1024; \ 1436 if (cp0[0] == 'm') \ 1437 val *= 1024 * 1024; \ 1438 } \ 1439 if (val < 1) { \ 1440 syslog(LOG_ERR, "%s: invalid buffer size `%s'", \ 1441 sep->se_service, (arg)); \ 1442 goto more; \ 1443 } \ 1444 } while (0) 1445 1446 #define ASSIGN(arg) \ 1447 do { \ 1448 if (strcmp((arg), "sndbuf") == 0) \ 1449 sep->se_sndbuf = val; \ 1450 else if (strcmp((arg), "rcvbuf") == 0) \ 1451 sep->se_rcvbuf = val; \ 1452 else \ 1453 MALFORMED((arg)); \ 1454 } while (0) 1455 1456 /* 1457 * Extract the send and receive buffer sizes before parsing 1458 * the protocol. 1459 */ 1460 sep->se_sndbuf = sep->se_rcvbuf = 0; 1461 buf0 = buf1 = sz0 = sz1 = NULL; 1462 if ((buf0 = strchr(sep->se_proto, ',')) != NULL) { 1463 /* Not meaningful for Tcpmux services. */ 1464 if (ISMUX(sep)) { 1465 syslog(LOG_ERR, "%s: can't specify buffer sizes for " 1466 "tcpmux services", sep->se_service); 1467 goto more; 1468 } 1469 1470 /* Skip the , */ 1471 *buf0++ = '\0'; 1472 1473 /* Check to see if another socket buffer size was specified. */ 1474 if ((buf1 = strchr(buf0, ',')) != NULL) { 1475 /* Skip the , */ 1476 *buf1++ = '\0'; 1477 1478 /* Make sure a 3rd one wasn't specified. */ 1479 if (strchr(buf1, ',') != NULL) { 1480 syslog(LOG_ERR, "%s: too many buffer sizes", 1481 sep->se_service); 1482 goto more; 1483 } 1484 1485 /* Locate the size. */ 1486 if ((sz1 = strchr(buf1, '=')) == NULL) 1487 MALFORMED(buf1); 1488 1489 /* Skip the = */ 1490 *sz1++ = '\0'; 1491 } 1492 1493 /* Locate the size. */ 1494 if ((sz0 = strchr(buf0, '=')) == NULL) 1495 MALFORMED(buf0); 1496 1497 /* Skip the = */ 1498 *sz0++ = '\0'; 1499 1500 GETVAL(sz0); 1501 ASSIGN(buf0); 1502 1503 if (buf1 != NULL) { 1504 GETVAL(sz1); 1505 ASSIGN(buf1); 1506 } 1507 } 1508 1509 #undef ASSIGN 1510 #undef GETVAL 1511 #undef MALFORMED 1512 1513 if (strcmp(sep->se_proto, "unix") == 0) { 1514 sep->se_family = AF_LOCAL; 1515 } else { 1516 val = strlen(sep->se_proto); 1517 if (!val) { 1518 syslog(LOG_ERR, "%s: invalid protocol specified", 1519 sep->se_service); 1520 goto more; 1521 } 1522 val = sep->se_proto[val - 1]; 1523 switch (val) { 1524 case '4': /*tcp4 or udp4*/ 1525 sep->se_family = AF_INET; 1526 break; 1527 #ifdef INET6 1528 case '6': /*tcp6 or udp6*/ 1529 sep->se_family = AF_INET6; 1530 break; 1531 #endif 1532 default: 1533 sep->se_family = AF_INET; /*will become AF_INET6*/ 1534 break; 1535 } 1536 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1537 #ifdef RPC 1538 char *cp, *ccp; 1539 cp = strchr(sep->se_service, '/'); 1540 if (cp == 0) { 1541 syslog(LOG_ERR, "%s: no rpc version", 1542 sep->se_service); 1543 goto more; 1544 } 1545 *cp++ = '\0'; 1546 sep->se_rpcversl = sep->se_rpcversh = 1547 strtol(cp, &ccp, 0); 1548 if (ccp == cp) { 1549 badafterall: 1550 syslog(LOG_ERR, "%s/%s: bad rpc version", 1551 sep->se_service, cp); 1552 goto more; 1553 } 1554 if (*ccp == '-') { 1555 cp = ccp + 1; 1556 sep->se_rpcversh = strtol(cp, &ccp, 0); 1557 if (ccp == cp) 1558 goto badafterall; 1559 } 1560 #else 1561 syslog(LOG_ERR, "%s: rpc services not suported", 1562 sep->se_service); 1563 goto more; 1564 #endif /* RPC */ 1565 } 1566 } 1567 arg = sskip(&cp); 1568 { 1569 char *cp; 1570 if ((cp = strchr(arg, ':')) == NULL) 1571 cp = strchr(arg, '.'); 1572 if (cp != NULL) { 1573 *cp++ = '\0'; 1574 sep->se_max = atoi(cp); 1575 } else 1576 sep->se_max = TOOMANY; 1577 } 1578 sep->se_wait = strcmp(arg, "wait") == 0; 1579 if (ISMUX(sep)) { 1580 /* 1581 * Silently enforce "nowait" for TCPMUX services since 1582 * they don't have an assigned port to listen on. 1583 */ 1584 sep->se_wait = 0; 1585 1586 if (strncmp(sep->se_proto, "tcp", 3)) { 1587 syslog(LOG_ERR, 1588 "%s: bad protocol for tcpmux service %s", 1589 CONFIG, sep->se_service); 1590 goto more; 1591 } 1592 if (sep->se_socktype != SOCK_STREAM) { 1593 syslog(LOG_ERR, 1594 "%s: bad socket type for tcpmux service %s", 1595 CONFIG, sep->se_service); 1596 goto more; 1597 } 1598 } 1599 sep->se_user = newstr(sskip(&cp)); 1600 if ((sep->se_group = strchr(sep->se_user, ':')) != NULL) 1601 *sep->se_group++ = '\0'; 1602 else if ((sep->se_group = strchr(sep->se_user, '.')) != NULL) 1603 *sep->se_group++ = '\0'; 1604 1605 sep->se_server = newstr(sskip(&cp)); 1606 if (strcmp(sep->se_server, "internal") == 0) { 1607 struct biltin *bi; 1608 1609 for (bi = biltins; bi->bi_service; bi++) 1610 if (bi->bi_socktype == sep->se_socktype && 1611 strcmp(bi->bi_service, sep->se_service) == 0) 1612 break; 1613 if (bi->bi_service == 0) { 1614 syslog(LOG_ERR, "internal service %s unknown", 1615 sep->se_service); 1616 goto more; 1617 } 1618 sep->se_bi = bi; 1619 sep->se_wait = bi->bi_wait; 1620 } else 1621 sep->se_bi = NULL; 1622 argc = 0; 1623 for (arg = skip(&cp); cp; arg = skip(&cp)) { 1624 #if MULOG 1625 char *colon; 1626 1627 if (argc == 0 && (colon = strrchr(arg, ':'))) { 1628 while (arg < colon) { 1629 int x; 1630 char *ccp; 1631 1632 switch (*arg++) { 1633 case 'l': 1634 x = 1; 1635 if (isdigit(*arg)) { 1636 x = strtol(arg, &ccp, 0); 1637 if (ccp == arg) 1638 break; 1639 arg = ccp; 1640 } 1641 sep->se_log &= ~MULOG_RFC931; 1642 sep->se_log |= x; 1643 break; 1644 case 'a': 1645 sep->se_log |= MULOG_RFC931; 1646 break; 1647 default: 1648 break; 1649 } 1650 } 1651 arg = colon + 1; 1652 } 1653 #endif 1654 if (argc < MAXARGV) 1655 sep->se_argv[argc++] = newstr(arg); 1656 } 1657 while (argc <= MAXARGV) 1658 sep->se_argv[argc++] = NULL; 1659 #ifdef IPSEC 1660 sep->se_policy = policy ? newstr(policy) : NULL; 1661 #endif 1662 return (sep); 1663 } 1664 1665 static void 1666 freeconfig(struct servtab *cp) 1667 { 1668 int i; 1669 1670 if (cp->se_hostaddr) 1671 free(cp->se_hostaddr); 1672 if (cp->se_service) 1673 free(cp->se_service); 1674 if (cp->se_proto) 1675 free(cp->se_proto); 1676 if (cp->se_user) 1677 free(cp->se_user); 1678 /* Note: se_group is part of the newstr'ed se_user */ 1679 if (cp->se_server) 1680 free(cp->se_server); 1681 for (i = 0; i < MAXARGV; i++) 1682 if (cp->se_argv[i]) 1683 free(cp->se_argv[i]); 1684 #ifdef IPSEC 1685 if (cp->se_policy) 1686 free(cp->se_policy); 1687 #endif 1688 } 1689 1690 1691 /* 1692 * Safe skip - if skip returns null, log a syntax error in the 1693 * configuration file and exit. 1694 */ 1695 static char * 1696 sskip(char **cpp) 1697 { 1698 char *cp; 1699 1700 cp = skip(cpp); 1701 if (cp == NULL) { 1702 syslog(LOG_ERR, "%s: syntax error", CONFIG); 1703 exit(1); 1704 } 1705 return (cp); 1706 } 1707 1708 static char * 1709 skip(char **cpp) 1710 { 1711 char *cp = *cpp; 1712 char *start; 1713 1714 if (*cpp == NULL) 1715 return (NULL); 1716 1717 again: 1718 while (*cp == ' ' || *cp == '\t') 1719 cp++; 1720 if (*cp == '\0') { 1721 int c; 1722 1723 c = getc(fconfig); 1724 (void) ungetc(c, fconfig); 1725 if (c == ' ' || c == '\t') 1726 if ((cp = nextline(fconfig))) 1727 goto again; 1728 *cpp = NULL; 1729 return (NULL); 1730 } 1731 start = cp; 1732 while (*cp && *cp != ' ' && *cp != '\t') 1733 cp++; 1734 if (*cp != '\0') 1735 *cp++ = '\0'; 1736 *cpp = cp; 1737 return (start); 1738 } 1739 1740 static char * 1741 nextline(FILE *fd) 1742 { 1743 char *cp; 1744 1745 if (fgets(line, sizeof (line), fd) == NULL) 1746 return (NULL); 1747 cp = strchr(line, '\n'); 1748 if (cp) 1749 *cp = '\0'; 1750 return (line); 1751 } 1752 1753 static char * 1754 newstr(char *cp) 1755 { 1756 if ((cp = strdup((cp !=NULL )? cp : "")) != NULL) 1757 return (cp); 1758 syslog(LOG_ERR, "strdup: %m"); 1759 exit(1); 1760 } 1761 1762 static void 1763 inetd_setproctitle(char *a, int s) 1764 { 1765 socklen_t size; 1766 struct sockaddr_storage ss; 1767 char hbuf[NI_MAXHOST]; 1768 1769 size = sizeof(ss); 1770 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) { 1771 if (getnameinfo((struct sockaddr *)&ss, size, hbuf, 1772 sizeof(hbuf), NULL, 0, niflags) == 0) 1773 setproctitle("-%s [%s]", a, hbuf); 1774 else 1775 setproctitle("-%s [?]", a); 1776 } else 1777 setproctitle("-%s", a); 1778 } 1779 1780 static void 1781 bump_nofile(void) 1782 { 1783 #ifdef RLIMIT_NOFILE 1784 1785 #define FD_CHUNK 32 1786 1787 struct rlimit rl; 1788 1789 if (getrlimit(RLIMIT_NOFILE, &rl) < 0) { 1790 syslog(LOG_ERR, "getrlimit: %m"); 1791 return; 1792 } 1793 rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK); 1794 if (rl.rlim_cur <= rlim_ofile_cur) { 1795 syslog(LOG_ERR, 1796 "bump_nofile: cannot extend file limit, max = %d", 1797 (int)rl.rlim_cur); 1798 return; 1799 } 1800 1801 if (setrlimit(RLIMIT_NOFILE, &rl) < 0) { 1802 syslog(LOG_ERR, "setrlimit: %m"); 1803 return; 1804 } 1805 1806 rlim_ofile_cur = rl.rlim_cur; 1807 return; 1808 1809 #else 1810 syslog(LOG_ERR, "bump_nofile: cannot extend file limit"); 1811 return; 1812 #endif 1813 } 1814 1815 /* 1816 * Internet services provided internally by inetd: 1817 */ 1818 #define BUFSIZE 4096 1819 1820 /* ARGSUSED */ 1821 static void 1822 echo_stream(int s, struct servtab *sep) /* Echo service -- echo data back */ 1823 { 1824 char buffer[BUFSIZE]; 1825 int i; 1826 1827 inetd_setproctitle(sep->se_service, s); 1828 while ((i = read(s, buffer, sizeof(buffer))) > 0 && 1829 write(s, buffer, i) > 0) 1830 ; 1831 } 1832 1833 /* ARGSUSED */ 1834 static void 1835 echo_dg(int s, struct servtab *sep) /* Echo service -- echo data back */ 1836 { 1837 char buffer[BUFSIZE]; 1838 int i; 1839 socklen_t size; 1840 struct sockaddr_storage ss; 1841 struct sockaddr *sa; 1842 1843 sa = (struct sockaddr *)&ss; 1844 size = sizeof(ss); 1845 if ((i = recvfrom(s, buffer, sizeof(buffer), 0, sa, &size)) < 0) 1846 return; 1847 if (port_good_dg(sa)) 1848 (void) sendto(s, buffer, i, 0, sa, size); 1849 } 1850 1851 /* ARGSUSED */ 1852 static void 1853 discard_stream(int s, struct servtab *sep) /* Discard service -- ignore data */ 1854 { 1855 char buffer[BUFSIZE]; 1856 1857 inetd_setproctitle(sep->se_service, s); 1858 while ((errno = 0, read(s, buffer, sizeof(buffer)) > 0) || 1859 errno == EINTR) 1860 ; 1861 } 1862 1863 /* ARGSUSED */ 1864 static void 1865 discard_dg(int s, struct servtab *sep) /* Discard service -- ignore data */ 1866 1867 { 1868 char buffer[BUFSIZE]; 1869 1870 (void) read(s, buffer, sizeof(buffer)); 1871 } 1872 1873 #include <ctype.h> 1874 #define LINESIZ 72 1875 char ring[128]; 1876 char *endring; 1877 1878 static void 1879 initring(void) 1880 { 1881 int i; 1882 1883 endring = ring; 1884 1885 for (i = 0; i <= 128; ++i) 1886 if (isprint(i)) 1887 *endring++ = i; 1888 } 1889 1890 /* ARGSUSED */ 1891 static void 1892 chargen_stream(int s,struct servtab *sep) /* Character generator */ 1893 { 1894 int len; 1895 char *rs, text[LINESIZ+2]; 1896 1897 inetd_setproctitle(sep->se_service, s); 1898 1899 if (!endring) { 1900 initring(); 1901 rs = ring; 1902 } 1903 1904 text[LINESIZ] = '\r'; 1905 text[LINESIZ + 1] = '\n'; 1906 for (rs = ring;;) { 1907 if ((len = endring - rs) >= LINESIZ) 1908 memmove(text, rs, LINESIZ); 1909 else { 1910 memmove(text, rs, len); 1911 memmove(text + len, ring, LINESIZ - len); 1912 } 1913 if (++rs == endring) 1914 rs = ring; 1915 if (write(s, text, sizeof(text)) != sizeof(text)) 1916 break; 1917 } 1918 } 1919 1920 /* ARGSUSED */ 1921 static void 1922 chargen_dg(int s, struct servtab *sep) /* Character generator */ 1923 { 1924 struct sockaddr_storage ss; 1925 struct sockaddr *sa; 1926 static char *rs; 1927 int len; 1928 socklen_t size; 1929 char text[LINESIZ+2]; 1930 1931 if (endring == 0) { 1932 initring(); 1933 rs = ring; 1934 } 1935 1936 sa = (struct sockaddr *)&ss; 1937 size = sizeof(ss); 1938 if (recvfrom(s, text, sizeof(text), 0, sa, &size) < 0) 1939 return; 1940 1941 if (!port_good_dg(sa)) 1942 return; 1943 1944 if ((len = endring - rs) >= LINESIZ) 1945 memmove(text, rs, LINESIZ); 1946 else { 1947 memmove(text, rs, len); 1948 memmove(text + len, ring, LINESIZ - len); 1949 } 1950 if (++rs == endring) 1951 rs = ring; 1952 text[LINESIZ] = '\r'; 1953 text[LINESIZ + 1] = '\n'; 1954 (void) sendto(s, text, sizeof(text), 0, sa, size); 1955 } 1956 1957 /* 1958 * Return a machine readable date and time, in the form of the 1959 * number of seconds since midnight, Jan 1, 1900. Since gettimeofday 1960 * returns the number of seconds since midnight, Jan 1, 1970, 1961 * we must add 2208988800 seconds to this figure to make up for 1962 * some seventy years Bell Labs was asleep. 1963 */ 1964 1965 static uint32_t 1966 machtime(void) 1967 { 1968 struct timeval tv; 1969 1970 if (gettimeofday(&tv, NULL) < 0) { 1971 if (debug) 1972 fprintf(stderr, "Unable to get time of day\n"); 1973 return (0); 1974 } 1975 #define OFFSET ((uint32_t)25567 * 24*60*60) 1976 return (htonl((uint32_t)(tv.tv_sec + OFFSET))); 1977 #undef OFFSET 1978 } 1979 1980 /* ARGSUSED */ 1981 static void 1982 machtime_stream(int s, struct servtab *sep) 1983 { 1984 uint32_t result; 1985 1986 result = machtime(); 1987 (void) write(s, (char *) &result, sizeof(result)); 1988 } 1989 1990 /* ARGSUSED */ 1991 void 1992 machtime_dg(int s, struct servtab *sep) 1993 { 1994 uint32_t result; 1995 struct sockaddr_storage ss; 1996 struct sockaddr *sa; 1997 socklen_t size; 1998 1999 sa = (struct sockaddr *)&ss; 2000 size = sizeof(ss); 2001 if (recvfrom(s, (char *)&result, sizeof(result), 0, sa, &size) < 0) 2002 return; 2003 if (!port_good_dg(sa)) 2004 return; 2005 result = machtime(); 2006 (void) sendto(s, (char *) &result, sizeof(result), 0, sa, size); 2007 } 2008 2009 /* ARGSUSED */ 2010 static void 2011 daytime_stream(int s,struct servtab *sep) 2012 /* Return human-readable time of day */ 2013 { 2014 char buffer[256]; 2015 time_t clock; 2016 int len; 2017 2018 clock = time((time_t *) 0); 2019 2020 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 2021 (void) write(s, buffer, len); 2022 } 2023 2024 /* ARGSUSED */ 2025 void 2026 daytime_dg(int s, struct servtab *sep) 2027 /* Return human-readable time of day */ 2028 { 2029 char buffer[256]; 2030 time_t clock; 2031 struct sockaddr_storage ss; 2032 struct sockaddr *sa; 2033 socklen_t size; 2034 int len; 2035 2036 clock = time((time_t *) 0); 2037 2038 sa = (struct sockaddr *)&ss; 2039 size = sizeof(ss); 2040 if (recvfrom(s, buffer, sizeof(buffer), 0, sa, &size) < 0) 2041 return; 2042 if (!port_good_dg(sa)) 2043 return; 2044 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 2045 (void) sendto(s, buffer, len, 0, sa, size); 2046 } 2047 2048 /* 2049 * print_service: 2050 * Dump relevant information to stderr 2051 */ 2052 static void 2053 print_service(char *action, struct servtab *sep) 2054 { 2055 2056 if (isrpcservice(sep)) 2057 fprintf(stderr, 2058 "%s: %s rpcprog=%d, rpcvers = %d/%d, proto=%s, wait:max=%d.%d, user:group=%s.%s builtin=%lx server=%s" 2059 #ifdef IPSEC 2060 " policy=\"%s\"" 2061 #endif 2062 "\n", 2063 action, sep->se_service, 2064 sep->se_rpcprog, sep->se_rpcversh, sep->se_rpcversl, sep->se_proto, 2065 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 2066 (long)sep->se_bi, sep->se_server 2067 #ifdef IPSEC 2068 , (sep->se_policy ? sep->se_policy : "") 2069 #endif 2070 ); 2071 else 2072 fprintf(stderr, 2073 "%s: %s proto=%s%s, wait:max=%d.%d, user:group=%s.%s builtin=%lx server=%s" 2074 #ifdef IPSEC 2075 " policy=%s" 2076 #endif 2077 "\n", 2078 action, sep->se_service, 2079 sep->se_type == FAITH_TYPE ? "faith/" : "", 2080 sep->se_proto, 2081 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 2082 (long)sep->se_bi, sep->se_server 2083 #ifdef IPSEC 2084 , (sep->se_policy ? sep->se_policy : "") 2085 #endif 2086 ); 2087 } 2088 2089 static void 2090 usage(void) 2091 { 2092 #ifdef LIBWRAP 2093 (void)fprintf(stderr, "usage: %s [-dl] [conf]\n", getprogname()); 2094 #else 2095 (void)fprintf(stderr, "usage: %s [-d] [conf]\n", getprogname()); 2096 #endif 2097 exit(1); 2098 } 2099 2100 2101 /* 2102 * Based on TCPMUX.C by Mark K. Lottor November 1988 2103 * sri-nic::ps:<mkl>tcpmux.c 2104 */ 2105 2106 static int /* # of characters upto \r,\n or \0 */ 2107 getline(int fd, char *buf, int len) 2108 { 2109 int count = 0, n; 2110 2111 do { 2112 n = read(fd, buf, len-count); 2113 if (n == 0) 2114 return (count); 2115 if (n < 0) 2116 return (-1); 2117 while (--n >= 0) { 2118 if (*buf == '\r' || *buf == '\n' || *buf == '\0') 2119 return (count); 2120 count++; 2121 buf++; 2122 } 2123 } while (count < len); 2124 return (count); 2125 } 2126 2127 #define MAX_SERV_LEN (256+2) /* 2 bytes for \r\n */ 2128 2129 #define strwrite(fd, buf) (void) write(fd, buf, sizeof(buf)-1) 2130 2131 static void 2132 tcpmux(int ctrl, struct servtab *sep) 2133 { 2134 char service[MAX_SERV_LEN+1]; 2135 int len; 2136 2137 /* Get requested service name */ 2138 if ((len = getline(ctrl, service, MAX_SERV_LEN)) < 0) { 2139 strwrite(ctrl, "-Error reading service name\r\n"); 2140 goto reject; 2141 } 2142 service[len] = '\0'; 2143 2144 if (debug) 2145 fprintf(stderr, "tcpmux: someone wants %s\n", service); 2146 2147 /* 2148 * Help is a required command, and lists available services, 2149 * one per line. 2150 */ 2151 if (!strcasecmp(service, "help")) { 2152 strwrite(ctrl, "+Available services:\r\n"); 2153 strwrite(ctrl, "help\r\n"); 2154 for (sep = servtab; sep != NULL; sep = sep->se_next) { 2155 if (!ISMUX(sep)) 2156 continue; 2157 (void)write(ctrl, sep->se_service, 2158 strlen(sep->se_service)); 2159 strwrite(ctrl, "\r\n"); 2160 } 2161 goto reject; 2162 } 2163 2164 /* Try matching a service in inetd.conf with the request */ 2165 for (sep = servtab; sep != NULL; sep = sep->se_next) { 2166 if (!ISMUX(sep)) 2167 continue; 2168 if (!strcasecmp(service, sep->se_service)) { 2169 if (ISMUXPLUS(sep)) 2170 strwrite(ctrl, "+Go\r\n"); 2171 run_service(ctrl, sep); 2172 return; 2173 } 2174 } 2175 strwrite(ctrl, "-Service not available\r\n"); 2176 reject: 2177 _exit(1); 2178 } 2179 2180 #ifdef MULOG 2181 void 2182 dolog(struct servtab *sep, int ctrl) 2183 { 2184 struct sockaddr_storage ss; 2185 struct sockaddr *sa = (struct sockaddr *)&ss; 2186 socklen_t len = sizeof(ss); 2187 char *host, *dp, buf[BUFSIZ]; 2188 int connected = 1; 2189 2190 switch (sep->se_family) { 2191 case AF_INET: 2192 #ifdef INET6 2193 case AF_INET6: 2194 #endif 2195 break; 2196 default: 2197 return; 2198 } 2199 2200 if (getpeername(ctrl, sa, &len) < 0) { 2201 if (errno != ENOTCONN) { 2202 syslog(LOG_ERR, "getpeername: %m"); 2203 return; 2204 } 2205 if (recvfrom(ctrl, buf, sizeof(buf), MSG_PEEK, sa, &len) < 0) { 2206 syslog(LOG_ERR, "recvfrom: %m"); 2207 return; 2208 } 2209 connected = 0; 2210 } 2211 switch (sa->sa_family) { 2212 case AF_INET: 2213 #ifdef INET6 2214 case AF_INET6: 2215 #endif 2216 break; 2217 default: 2218 syslog(LOG_ERR, "unexpected address family %u", sa->sa_family); 2219 return; 2220 } 2221 2222 if (getnameinfo(sa, len, buf, sizeof(buf), NULL, 0, 0) != 0) 2223 strcpy(buf, "?"); 2224 host = buf; 2225 2226 switch (sep->se_log & ~MULOG_RFC931) { 2227 case 0: 2228 return; 2229 case 1: 2230 if (curdom == NULL || *curdom == '\0') 2231 break; 2232 dp = host + strlen(host) - strlen(curdom); 2233 if (dp < host) 2234 break; 2235 if (debug) 2236 fprintf(stderr, "check \"%s\" against curdom \"%s\"\n", 2237 host, curdom); 2238 if (strcasecmp(dp, curdom) == 0) 2239 return; 2240 break; 2241 case 2: 2242 default: 2243 break; 2244 } 2245 2246 openlog("", LOG_NOWAIT, MULOG); 2247 2248 if (connected && (sep->se_log & MULOG_RFC931)) 2249 syslog(LOG_INFO, "%s@%s wants %s", 2250 rfc931_name(sa, ctrl), host, sep->se_service); 2251 else 2252 syslog(LOG_INFO, "%s wants %s", 2253 host, sep->se_service); 2254 } 2255 2256 /* 2257 * From tcp_log by 2258 * Wietse Venema, Eindhoven University of Technology, The Netherlands. 2259 */ 2260 #if 0 2261 static char sccsid[] = "@(#) rfc931.c 1.3 92/08/31 22:54:46"; 2262 #endif 2263 2264 #include <setjmp.h> 2265 2266 #define RFC931_PORT 113 /* Semi-well-known port */ 2267 #define TIMEOUT 4 2268 #define TIMEOUT2 10 2269 2270 static jmp_buf timebuf; 2271 2272 /* timeout - handle timeouts */ 2273 2274 static void 2275 timeout(int sig) 2276 { 2277 longjmp(timebuf, sig); 2278 } 2279 2280 /* rfc931_name - return remote user name */ 2281 2282 char * 2283 rfc931_name(struct sockaddr *there, /* remote link information */ 2284 int ctrl) 2285 { 2286 struct sockaddr_storage here; /* local link information */ 2287 struct sockaddr_storage sin; /* for talking to RFC931 daemon */ 2288 socklen_t length; 2289 int s; 2290 unsigned remote; 2291 unsigned local; 2292 static char user[256]; /* XXX */ 2293 char buf[256]; 2294 char *cp; 2295 char *result = "USER_UNKNOWN"; 2296 int len; 2297 u_int16_t myport, hisport; 2298 2299 /* Find out local port number of our stdin. */ 2300 2301 length = sizeof(here); 2302 if (getsockname(ctrl, (struct sockaddr *) &here, &length) == -1) { 2303 syslog(LOG_ERR, "getsockname: %m"); 2304 return (result); 2305 } 2306 switch (here.ss_family) { 2307 case AF_INET: 2308 myport = ((struct sockaddr_in *)&here)->sin_port; 2309 break; 2310 #ifdef INET6 2311 case AF_INET6: 2312 myport = ((struct sockaddr_in6 *)&here)->sin6_port; 2313 break; 2314 #endif 2315 } 2316 switch (there->sa_family) { 2317 case AF_INET: 2318 hisport = ((struct sockaddr_in *)&there)->sin_port; 2319 break; 2320 #ifdef INET6 2321 case AF_INET6: 2322 hisport = ((struct sockaddr_in6 *)&there)->sin6_port; 2323 break; 2324 #endif 2325 } 2326 /* Set up timer so we won't get stuck. */ 2327 2328 if ((s = socket(here.ss_family, SOCK_STREAM, 0)) == -1) { 2329 syslog(LOG_ERR, "socket: %m"); 2330 return (result); 2331 } 2332 2333 sin = here; 2334 switch (sin.ss_family) { 2335 case AF_INET: 2336 ((struct sockaddr_in *)&sin)->sin_port = htons(0); 2337 break; 2338 #ifdef INET6 2339 case AF_INET6: 2340 ((struct sockaddr_in6 *)&sin)->sin6_port = htons(0); 2341 break; 2342 #endif 2343 } 2344 if (bind(s, (struct sockaddr *) &sin, sin.ss_len) == -1) { 2345 syslog(LOG_ERR, "bind: %m"); 2346 return (result); 2347 } 2348 2349 signal(SIGALRM, timeout); 2350 if (setjmp(timebuf)) { 2351 close(s); /* not: fclose(fp) */ 2352 return (result); 2353 } 2354 alarm(TIMEOUT); 2355 2356 /* Connect to the RFC931 daemon. */ 2357 2358 memcpy(&sin, there, there->sa_len); 2359 switch (sin.ss_family) { 2360 case AF_INET: 2361 ((struct sockaddr_in *)&sin)->sin_port = htons(RFC931_PORT); 2362 break; 2363 #ifdef INET6 2364 case AF_INET6: 2365 ((struct sockaddr_in6 *)&sin)->sin6_port = htons(RFC931_PORT); 2366 break; 2367 #endif 2368 } 2369 if (connect(s, (struct sockaddr *) &sin, sin.ss_len) == -1) { 2370 close(s); 2371 alarm(0); 2372 return (result); 2373 } 2374 2375 /* Query the RFC 931 server. Would 13-byte writes ever be broken up? */ 2376 (void)snprintf(buf, sizeof buf, "%u,%u\r\n", ntohs(hisport), 2377 ntohs(myport)); 2378 2379 for (len = 0, cp = buf; len < strlen(buf); ) { 2380 int n; 2381 2382 if ((n = write(s, cp, strlen(buf) - len)) == -1) { 2383 close(s); 2384 alarm(0); 2385 return (result); 2386 } 2387 cp += n; 2388 len += n; 2389 } 2390 2391 /* Read response */ 2392 for (cp = buf; cp < buf + sizeof(buf) - 1; ) { 2393 char c; 2394 if (read(s, &c, 1) != 1) { 2395 close(s); 2396 alarm(0); 2397 return (result); 2398 } 2399 if (c == '\n') 2400 break; 2401 *cp++ = c; 2402 } 2403 *cp = '\0'; 2404 2405 if (sscanf(buf, "%u , %u : USERID :%*[^:]:%255s", &remote, &local, 2406 user) == 3 && ntohs(hisport) == remote && ntohs(myport) == local) { 2407 /* Strip trailing carriage return. */ 2408 if ((cp = strchr(user, '\r')) != NULL) 2409 *cp = 0; 2410 result = user; 2411 } 2412 2413 alarm(0); 2414 close(s); 2415 return (result); 2416 } 2417 #endif 2418 2419 /* 2420 * check if the address/port where send data to is one of the obvious ports 2421 * that are used for denial of service attacks like two echo ports 2422 * just echoing data between them 2423 */ 2424 static int 2425 port_good_dg(struct sockaddr *sa) 2426 { 2427 struct in_addr in; 2428 #ifdef INET6 2429 struct in6_addr *in6; 2430 #endif 2431 u_int16_t port; 2432 int i, bad; 2433 char hbuf[NI_MAXHOST]; 2434 2435 bad = 0; 2436 2437 switch (sa->sa_family) { 2438 case AF_INET: 2439 in.s_addr = ntohl(((struct sockaddr_in *)sa)->sin_addr.s_addr); 2440 port = ntohs(((struct sockaddr_in *)sa)->sin_port); 2441 v4chk: 2442 if (IN_MULTICAST(in.s_addr)) 2443 goto bad; 2444 switch ((in.s_addr & 0xff000000) >> 24) { 2445 case 0: case 127: case 255: 2446 goto bad; 2447 } 2448 if (dg_broadcast(&in)) 2449 goto bad; 2450 break; 2451 #ifdef INET6 2452 case AF_INET6: 2453 in6 = &((struct sockaddr_in6 *)sa)->sin6_addr; 2454 port = ntohs(((struct sockaddr_in6 *)sa)->sin6_port); 2455 if (IN6_IS_ADDR_MULTICAST(in6) || IN6_IS_ADDR_UNSPECIFIED(in6)) 2456 goto bad; 2457 if (IN6_IS_ADDR_V4MAPPED(in6) || IN6_IS_ADDR_V4COMPAT(in6)) { 2458 memcpy(&in, &in6->s6_addr[12], sizeof(in)); 2459 in.s_addr = ntohl(in.s_addr); 2460 goto v4chk; 2461 } 2462 break; 2463 #endif 2464 default: 2465 /* XXX unsupported af, is it safe to assume it to be safe? */ 2466 return (1); 2467 } 2468 2469 for (i = 0; bad_ports[i] != 0; i++) { 2470 if (port == bad_ports[i]) 2471 goto bad; 2472 } 2473 2474 return (1); 2475 2476 bad: 2477 if (getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), NULL, 0, 2478 niflags) != 0) 2479 strcpy(hbuf, "?"); 2480 syslog(LOG_WARNING,"Possible DoS attack from %s, Port %d", 2481 hbuf, port); 2482 return (0); 2483 } 2484 2485 /* XXX need optimization */ 2486 static int 2487 dg_broadcast(struct in_addr *in) 2488 { 2489 struct ifaddrs *ifa, *ifap; 2490 struct sockaddr_in *sin; 2491 2492 if (getifaddrs(&ifap) < 0) 2493 return (0); 2494 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 2495 if (ifa->ifa_addr->sa_family != AF_INET || 2496 (ifa->ifa_flags & IFF_BROADCAST) == 0) 2497 continue; 2498 sin = (struct sockaddr_in *)ifa->ifa_broadaddr; 2499 if (sin->sin_addr.s_addr == in->s_addr) { 2500 freeifaddrs(ifap); 2501 return (1); 2502 } 2503 } 2504 freeifaddrs(ifap); 2505 return (0); 2506 } 2507 2508 static int 2509 my_kevent(const struct kevent *changelist, size_t nchanges, 2510 struct kevent *eventlist, size_t nevents) 2511 { 2512 int result; 2513 2514 while ((result = kevent(kq, changelist, nchanges, eventlist, nevents, 2515 NULL)) < 0) 2516 if (errno != EINTR) { 2517 syslog(LOG_ERR, "kevent: %m"); 2518 exit(EXIT_FAILURE); 2519 } 2520 2521 return (result); 2522 } 2523 2524 static struct kevent * 2525 allocchange(void) 2526 { 2527 if (changes == A_CNT(changebuf)) { 2528 (void) my_kevent(changebuf, A_CNT(changebuf), NULL, 0); 2529 changes = 0; 2530 } 2531 2532 return (&changebuf[changes++]); 2533 } 2534
Indexes created Fri Sep 26 08:10:20 GMT 2025