inetd.c revision 1.83
1 /* $NetBSD: inetd.c,v 1.83 2002/07/04 12:35:19 itojun Exp $ */ 2 3 /*- 4 * Copyright (c) 1998 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. 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 1.83 2002/07/04 12:35:19 itojun 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> 205 206 #ifndef RLIMIT_NOFILE 207 #define RLIMIT_NOFILE RLIMIT_OFILE 208 #endif 209 210 #ifndef NO_RPC 211 #define RPC 212 #endif 213 214 #include <net/if.h> 215 216 #include <netinet/in.h> 217 #include <arpa/inet.h> 218 #ifdef RPC 219 #include <rpc/rpc.h> 220 #include <rpc/rpcb_clnt.h> 221 #include <netconfig.h> 222 #endif 223 224 #include <ctype.h> 225 #include <errno.h> 226 #include <fcntl.h> 227 #include <grp.h> 228 #include <netdb.h> 229 #include <pwd.h> 230 #include <signal.h> 231 #include <stdio.h> 232 #include <stdlib.h> 233 #include <string.h> 234 #include <syslog.h> 235 #include <unistd.h> 236 #include <util.h> 237 #include <ifaddrs.h> 238 239 #include "pathnames.h" 240 241 #ifdef IPSEC 242 #include <netinet6/ipsec.h> 243 #ifndef IPSEC_POLICY_IPSEC /* no ipsec support on old ipsec */ 244 #undef IPSEC 245 #endif 246 #include "ipsec.h" 247 #endif 248 249 #ifdef LIBWRAP 250 # include <tcpd.h> 251 #ifndef LIBWRAP_ALLOW_FACILITY 252 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH 253 #endif 254 #ifndef LIBWRAP_ALLOW_SEVERITY 255 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO 256 #endif 257 #ifndef LIBWRAP_DENY_FACILITY 258 # define LIBWRAP_DENY_FACILITY LOG_AUTH 259 #endif 260 #ifndef LIBWRAP_DENY_SEVERITY 261 # define LIBWRAP_DENY_SEVERITY LOG_WARNING 262 #endif 263 int allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY; 264 int deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY; 265 #endif 266 267 #define TOOMANY 40 /* don't start more than TOOMANY */ 268 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */ 269 #define RETRYTIME (60*10) /* retry after bind or server fail */ 270 271 #define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM)) 272 273 int debug; 274 #ifdef LIBWRAP 275 int lflag; 276 #endif 277 int nsock, maxsock; 278 fd_set allsock; 279 int options; 280 int timingout; 281 struct servent *sp; 282 char *curdom; 283 const int niflags = NI_NUMERICHOST | NI_NUMERICSERV; 284 285 #ifndef OPEN_MAX 286 #define OPEN_MAX 64 287 #endif 288 289 /* Reserve some descriptors, 3 stdio + at least: 1 log, 1 conf. file */ 290 #define FD_MARGIN (8) 291 rlim_t rlim_ofile_cur = OPEN_MAX; 292 293 #ifdef RLIMIT_NOFILE 294 struct rlimit rlim_ofile; 295 #endif 296 297 struct servtab { 298 char *se_hostaddr; /* host address to listen on */ 299 char *se_service; /* name of service */ 300 int se_socktype; /* type of socket to use */ 301 int se_family; /* address family */ 302 char *se_proto; /* protocol used */ 303 int se_sndbuf; /* sndbuf size */ 304 int se_rcvbuf; /* rcvbuf size */ 305 int se_rpcprog; /* rpc program number */ 306 int se_rpcversl; /* rpc program lowest version */ 307 int se_rpcversh; /* rpc program highest version */ 308 #define isrpcservice(sep) ((sep)->se_rpcversl != 0) 309 pid_t se_wait; /* single threaded server */ 310 short se_checked; /* looked at during merge */ 311 char *se_user; /* user name to run as */ 312 char *se_group; /* group name to run as */ 313 struct biltin *se_bi; /* if built-in, description */ 314 char *se_server; /* server program */ 315 #define MAXARGV 20 316 char *se_argv[MAXARGV+1]; /* program arguments */ 317 #ifdef IPSEC 318 char *se_policy; /* IPsec poilcy string */ 319 #endif 320 int se_fd; /* open descriptor */ 321 int se_type; /* type */ 322 union { 323 struct sockaddr se_un_ctrladdr; 324 struct sockaddr_in se_un_ctrladdr_in; 325 struct sockaddr_in6 se_un_ctrladdr_in6; 326 struct sockaddr_un se_un_ctrladdr_un; 327 } se_un; /* bound address */ 328 #define se_ctrladdr se_un.se_un_ctrladdr 329 #define se_ctrladdr_in se_un.se_un_ctrladdr_in 330 #define se_ctrladdr_un se_un.se_un_ctrladdr_un 331 int se_ctrladdr_size; 332 int se_max; /* max # of instances of this service */ 333 int se_count; /* number started since se_time */ 334 struct timeval se_time; /* start of se_count */ 335 #ifdef MULOG 336 int se_log; 337 #define MULOG_RFC931 0x40000000 338 #endif 339 struct servtab *se_next; 340 } *servtab; 341 342 #define NORM_TYPE 0 343 #define MUX_TYPE 1 344 #define MUXPLUS_TYPE 2 345 #define FAITH_TYPE 3 346 #define ISMUX(sep) (((sep)->se_type == MUX_TYPE) || \ 347 ((sep)->se_type == MUXPLUS_TYPE)) 348 #define ISMUXPLUS(sep) ((sep)->se_type == MUXPLUS_TYPE) 349 350 351 void chargen_dg __P((int, struct servtab *)); 352 void chargen_stream __P((int, struct servtab *)); 353 void close_sep __P((struct servtab *)); 354 void config __P((int)); 355 void daytime_dg __P((int, struct servtab *)); 356 void daytime_stream __P((int, struct servtab *)); 357 void discard_dg __P((int, struct servtab *)); 358 void discard_stream __P((int, struct servtab *)); 359 void echo_dg __P((int, struct servtab *)); 360 void echo_stream __P((int, struct servtab *)); 361 void endconfig __P((void)); 362 struct servtab *enter __P((struct servtab *)); 363 void freeconfig __P((struct servtab *)); 364 struct servtab *getconfigent __P((void)); 365 void goaway __P((int)); 366 void machtime_dg __P((int, struct servtab *)); 367 void machtime_stream __P((int, struct servtab *)); 368 char *newstr __P((char *)); 369 char *nextline __P((FILE *)); 370 void print_service __P((char *, struct servtab *)); 371 void reapchild __P((int)); 372 void retry __P((int)); 373 void run_service __P((int, struct servtab *)); 374 int setconfig __P((void)); 375 void setup __P((struct servtab *)); 376 char *sskip __P((char **)); 377 char *skip __P((char **)); 378 void tcpmux __P((int, struct servtab *)); 379 void usage __P((void)); 380 void register_rpc __P((struct servtab *)); 381 void unregister_rpc __P((struct servtab *)); 382 void bump_nofile __P((void)); 383 void inetd_setproctitle __P((char *, int)); 384 void initring __P((void)); 385 uint32_t machtime __P((void)); 386 int port_good_dg __P((struct sockaddr *)); 387 int dg_broadcast __P((struct in_addr *)); 388 static int getline __P((int, char *, int)); 389 int main __P((int, char *[])); 390 void spawn __P((struct servtab *, int)); 391 #ifdef MULOG 392 void dolog __P((struct servtab *, int)); 393 static void timeout __P((int)); 394 char *rfc931_name __P((struct sockaddr *, int)); 395 #endif 396 397 struct biltin { 398 char *bi_service; /* internally provided service name */ 399 int bi_socktype; /* type of socket supported */ 400 short bi_fork; /* 1 if should fork before call */ 401 short bi_wait; /* 1 if should wait for child */ 402 void (*bi_fn) __P((int, struct servtab *)); 403 /* function which performs it */ 404 } biltins[] = { 405 /* Echo received data */ 406 { "echo", SOCK_STREAM, 1, 0, echo_stream }, 407 { "echo", SOCK_DGRAM, 0, 0, echo_dg }, 408 409 /* Internet /dev/null */ 410 { "discard", SOCK_STREAM, 1, 0, discard_stream }, 411 { "discard", SOCK_DGRAM, 0, 0, discard_dg }, 412 413 /* Return 32 bit time since 1970 */ 414 { "time", SOCK_STREAM, 0, 0, machtime_stream }, 415 { "time", SOCK_DGRAM, 0, 0, machtime_dg }, 416 417 /* Return human-readable time */ 418 { "daytime", SOCK_STREAM, 0, 0, daytime_stream }, 419 { "daytime", SOCK_DGRAM, 0, 0, daytime_dg }, 420 421 /* Familiar character generator */ 422 { "chargen", SOCK_STREAM, 1, 0, chargen_stream }, 423 { "chargen", SOCK_DGRAM, 0, 0, chargen_dg }, 424 425 { "tcpmux", SOCK_STREAM, 1, 0, tcpmux }, 426 427 { NULL } 428 }; 429 430 /* list of "bad" ports. I.e. ports that are most obviously used for 431 * "cycling packets" denial of service attacks. See /etc/services. 432 * List must end with port number "0". 433 */ 434 435 u_int16_t bad_ports[] = { 7, 9, 13, 19, 37, 0 }; 436 437 438 #define NUMINT (sizeof(intab) / sizeof(struct inent)) 439 char *CONFIG = _PATH_INETDCONF; 440 441 int 442 main(argc, argv) 443 int argc; 444 char *argv[]; 445 { 446 struct servtab *sep, *nsep; 447 struct sigvec sv; 448 int ch; 449 450 while ((ch = getopt(argc, argv, 451 #ifdef LIBWRAP 452 "dl" 453 #else 454 "d" 455 #endif 456 )) != -1) 457 switch(ch) { 458 case 'd': 459 debug = 1; 460 options |= SO_DEBUG; 461 break; 462 #ifdef LIBWRAP 463 case 'l': 464 lflag = 1; 465 break; 466 #endif 467 case '?': 468 default: 469 usage(); 470 } 471 argc -= optind; 472 argv += optind; 473 474 if (argc > 0) 475 CONFIG = argv[0]; 476 477 if (debug == 0) 478 daemon(0, 0); 479 openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON); 480 pidfile(NULL); 481 482 #ifdef RLIMIT_NOFILE 483 if (getrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) { 484 syslog(LOG_ERR, "getrlimit: %m"); 485 } else { 486 rlim_ofile_cur = rlim_ofile.rlim_cur; 487 if (rlim_ofile_cur == RLIM_INFINITY) /* ! */ 488 rlim_ofile_cur = OPEN_MAX; 489 } 490 #endif 491 492 memset(&sv, 0, sizeof(sv)); 493 sv.sv_mask = SIGBLOCK; 494 sv.sv_handler = retry; 495 sigvec(SIGALRM, &sv, (struct sigvec *)0); 496 config(SIGHUP); 497 sv.sv_handler = config; 498 sigvec(SIGHUP, &sv, (struct sigvec *)0); 499 sv.sv_handler = reapchild; 500 sigvec(SIGCHLD, &sv, (struct sigvec *)0); 501 sv.sv_handler = goaway; 502 sigvec(SIGTERM, &sv, (struct sigvec *)0); 503 sv.sv_handler = goaway; 504 sigvec(SIGINT, &sv, (struct sigvec *)0); 505 sv.sv_mask = 0L; 506 sv.sv_handler = SIG_IGN; 507 sigvec(SIGPIPE, &sv, (struct sigvec *)0); 508 509 for (;;) { 510 int n, ctrl; 511 fd_set readable; 512 513 if (nsock == 0) { 514 (void) sigblock(SIGBLOCK); 515 while (nsock == 0) 516 sigpause(0L); 517 (void) sigsetmask(0L); 518 } 519 readable = allsock; 520 if ((n = select(maxsock + 1, &readable, (fd_set *)0, 521 (fd_set *)0, (struct timeval *)0)) <= 0) { 522 if (n == -1 && errno != EINTR) { 523 syslog(LOG_WARNING, "select: %m"); 524 sleep(1); 525 } 526 continue; 527 } 528 for (sep = servtab; n && sep; sep = nsep) { 529 nsep = sep->se_next; 530 if (sep->se_fd == -1 || 531 !FD_ISSET(sep->se_fd, &readable)) 532 continue; 533 534 n--; 535 if (debug) 536 fprintf(stderr, "someone wants %s\n", sep->se_service); 537 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 538 /* XXX here do the libwrap check-before-accept */ 539 ctrl = accept(sep->se_fd, (struct sockaddr *)0, 540 (int *)0); 541 if (debug) 542 fprintf(stderr, "accept, ctrl %d\n", 543 ctrl); 544 if (ctrl < 0) { 545 if (errno != EINTR) 546 syslog(LOG_WARNING, 547 "accept (for %s): %m", 548 sep->se_service); 549 continue; 550 } 551 } else 552 ctrl = sep->se_fd; 553 (void) sigblock(SIGBLOCK); 554 spawn(sep, ctrl); 555 } 556 } 557 } 558 559 void 560 spawn(sep, ctrl) 561 struct servtab *sep; 562 int ctrl; 563 { 564 int dofork; 565 pid_t pid; 566 struct sigvec sv; 567 568 pid = 0; 569 #ifdef LIBWRAP_INTERNAL 570 dofork = 1; 571 #else 572 dofork = (sep->se_bi == 0 || sep->se_bi->bi_fork); 573 #endif 574 if (dofork) { 575 if (sep->se_count++ == 0) 576 (void)gettimeofday(&sep->se_time, (struct timezone *)0); 577 else if (sep->se_count >= sep->se_max) { 578 struct timeval now; 579 580 (void)gettimeofday(&now, (struct timezone *)0); 581 if (now.tv_sec - sep->se_time.tv_sec > CNT_INTVL) { 582 sep->se_time = now; 583 sep->se_count = 1; 584 } else { 585 syslog(LOG_ERR, 586 "%s/%s server failing (looping), service terminated\n", 587 sep->se_service, sep->se_proto); 588 if (!sep->se_wait && sep->se_socktype == 589 SOCK_STREAM) 590 close(ctrl); 591 close_sep(sep); 592 sigsetmask(0L); 593 if (!timingout) { 594 timingout = 1; 595 alarm(RETRYTIME); 596 } 597 return; 598 } 599 } 600 pid = fork(); 601 if (pid < 0) { 602 syslog(LOG_ERR, "fork: %m"); 603 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 604 close(ctrl); 605 sigsetmask(0L); 606 sleep(1); 607 return; 608 } 609 if (pid != 0 && sep->se_wait) { 610 sep->se_wait = pid; 611 FD_CLR(sep->se_fd, &allsock); 612 nsock--; 613 } 614 if (pid == 0) { 615 memset(&sv, 0, sizeof(sv)); 616 sv.sv_mask = 0L; 617 sv.sv_handler = SIG_DFL; 618 sigvec(SIGPIPE, &sv, (struct sigvec *)0); 619 if (debug) 620 setsid(); 621 } 622 } 623 sigsetmask(0L); 624 if (pid == 0) { 625 run_service(ctrl, sep); 626 if (dofork) 627 exit(0); 628 } 629 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 630 close(ctrl); 631 } 632 633 void 634 run_service(ctrl, sep) 635 int ctrl; 636 struct servtab *sep; 637 { 638 struct passwd *pwd; 639 struct group *grp = NULL; /* XXX gcc */ 640 char buf[NI_MAXSERV]; 641 #ifdef LIBWRAP 642 struct request_info req; 643 int denied; 644 char *service = NULL; /* XXX gcc */ 645 #endif 646 647 #ifdef LIBWRAP 648 #ifndef LIBWRAP_INTERNAL 649 if (sep->se_bi == 0) 650 #endif 651 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 652 request_init(&req, RQ_DAEMON, sep->se_argv[0] ? 653 sep->se_argv[0] : sep->se_service, RQ_FILE, ctrl, NULL); 654 fromhost(&req); 655 denied = !hosts_access(&req); 656 if (denied || lflag) { 657 if (getnameinfo(&sep->se_ctrladdr, 658 sep->se_ctrladdr.sa_len, NULL, 0, 659 buf, sizeof(buf), 0) != 0) { 660 /* shouldn't happen */ 661 (void)snprintf(buf, sizeof buf, "%d", 662 ntohs(sep->se_ctrladdr_in.sin_port)); 663 } 664 service = buf; 665 } 666 if (denied) { 667 syslog(deny_severity, 668 "refused connection from %.500s, service %s (%s)", 669 eval_client(&req), service, sep->se_proto); 670 goto reject; 671 } 672 if (lflag) { 673 syslog(allow_severity, 674 "connection from %.500s, service %s (%s)", 675 eval_client(&req), service, sep->se_proto); 676 } 677 } 678 #endif /* LIBWRAP */ 679 680 if (sep->se_bi) { 681 (*sep->se_bi->bi_fn)(ctrl, sep); 682 } else { 683 if ((pwd = getpwnam(sep->se_user)) == NULL) { 684 syslog(LOG_ERR, "%s/%s: %s: No such user", 685 sep->se_service, sep->se_proto, sep->se_user); 686 goto reject; 687 } 688 if (sep->se_group && 689 (grp = getgrnam(sep->se_group)) == NULL) { 690 syslog(LOG_ERR, "%s/%s: %s: No such group", 691 sep->se_service, sep->se_proto, sep->se_group); 692 goto reject; 693 } 694 if (pwd->pw_uid) { 695 if (sep->se_group) 696 pwd->pw_gid = grp->gr_gid; 697 if (setgid(pwd->pw_gid) < 0) { 698 syslog(LOG_ERR, 699 "%s/%s: can't set gid %d: %m", sep->se_service, 700 sep->se_proto, pwd->pw_gid); 701 goto reject; 702 } 703 (void) initgroups(pwd->pw_name, 704 pwd->pw_gid); 705 if (setuid(pwd->pw_uid) < 0) { 706 syslog(LOG_ERR, 707 "%s/%s: can't set uid %d: %m", sep->se_service, 708 sep->se_proto, pwd->pw_uid); 709 goto reject; 710 } 711 } else if (sep->se_group) { 712 (void) setgid((gid_t)grp->gr_gid); 713 } 714 if (debug) 715 fprintf(stderr, "%d execl %s\n", 716 getpid(), sep->se_server); 717 #ifdef MULOG 718 if (sep->se_log) 719 dolog(sep, ctrl); 720 #endif 721 /* Set our control descriptor to not close-on-exec... */ 722 if (fcntl(ctrl, F_SETFD, 0) < 0) 723 syslog(LOG_ERR, "fcntl (F_SETFD, 0): %m"); 724 /* ...and dup it to stdin, stdout, and stderr. */ 725 if (ctrl != 0) { 726 dup2(ctrl, 0); 727 close(ctrl); 728 ctrl = 0; 729 } 730 dup2(0, 1); 731 dup2(0, 2); 732 #ifdef RLIMIT_NOFILE 733 if (rlim_ofile.rlim_cur != rlim_ofile_cur && 734 setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) 735 syslog(LOG_ERR, "setrlimit: %m"); 736 #endif 737 execv(sep->se_server, sep->se_argv); 738 syslog(LOG_ERR, "cannot execute %s: %m", sep->se_server); 739 reject: 740 if (sep->se_socktype != SOCK_STREAM) 741 recv(ctrl, buf, sizeof (buf), 0); 742 _exit(1); 743 } 744 } 745 746 void 747 reapchild(signo) 748 int signo; 749 { 750 int status; 751 pid_t pid; 752 struct servtab *sep; 753 754 for (;;) { 755 pid = wait3(&status, WNOHANG, (struct rusage *)0); 756 if (pid <= 0) 757 break; 758 if (debug) 759 fprintf(stderr, "%d reaped, status %#x\n", 760 pid, status); 761 for (sep = servtab; sep; sep = sep->se_next) 762 if (sep->se_wait == pid) { 763 if (WIFEXITED(status) && WEXITSTATUS(status)) 764 syslog(LOG_WARNING, 765 "%s: exit status 0x%x", 766 sep->se_server, WEXITSTATUS(status)); 767 else if (WIFSIGNALED(status)) 768 syslog(LOG_WARNING, 769 "%s: exit signal 0x%x", 770 sep->se_server, WTERMSIG(status)); 771 sep->se_wait = 1; 772 FD_SET(sep->se_fd, &allsock); 773 nsock++; 774 if (debug) 775 fprintf(stderr, "restored %s, fd %d\n", 776 sep->se_service, sep->se_fd); 777 } 778 } 779 } 780 781 void 782 config(signo) 783 int signo; 784 { 785 struct servtab *sep, *cp, **sepp; 786 long omask; 787 int n; 788 789 if (!setconfig()) { 790 syslog(LOG_ERR, "%s: %m", CONFIG); 791 return; 792 } 793 for (sep = servtab; sep; sep = sep->se_next) 794 sep->se_checked = 0; 795 while ((cp = getconfigent())) { 796 for (sep = servtab; sep; sep = sep->se_next) 797 if (strcmp(sep->se_service, cp->se_service) == 0 && 798 strcmp(sep->se_hostaddr, cp->se_hostaddr) == 0 && 799 strcmp(sep->se_proto, cp->se_proto) == 0 && 800 ISMUX(sep) == ISMUX(cp)) 801 break; 802 if (sep != 0) { 803 int i; 804 805 #define SWAP(type, a, b) {type c=(type)a; (type)a=(type)b; (type)b=(type)c;} 806 807 omask = sigblock(SIGBLOCK); 808 /* 809 * sep->se_wait may be holding the pid of a daemon 810 * that we're waiting for. If so, don't overwrite 811 * it unless the config file explicitly says don't 812 * wait. 813 */ 814 if (cp->se_bi == 0 && 815 (sep->se_wait == 1 || cp->se_wait == 0)) 816 sep->se_wait = cp->se_wait; 817 SWAP(char *, sep->se_user, cp->se_user); 818 SWAP(char *, sep->se_group, cp->se_group); 819 SWAP(char *, sep->se_server, cp->se_server); 820 for (i = 0; i < MAXARGV; i++) 821 SWAP(char *, sep->se_argv[i], cp->se_argv[i]); 822 #ifdef IPSEC 823 SWAP(char *, sep->se_policy, cp->se_policy); 824 #endif 825 SWAP(int, cp->se_type, sep->se_type); 826 SWAP(int, cp->se_max, sep->se_max); 827 #undef SWAP 828 if (isrpcservice(sep)) 829 unregister_rpc(sep); 830 sep->se_rpcversl = cp->se_rpcversl; 831 sep->se_rpcversh = cp->se_rpcversh; 832 sigsetmask(omask); 833 freeconfig(cp); 834 if (debug) 835 print_service("REDO", sep); 836 } else { 837 sep = enter(cp); 838 if (debug) 839 print_service("ADD ", sep); 840 } 841 sep->se_checked = 1; 842 843 switch (sep->se_family) { 844 case AF_LOCAL: 845 if (sep->se_fd != -1) 846 break; 847 n = strlen(sep->se_service); 848 if (n > sizeof(sep->se_ctrladdr_un.sun_path)) { 849 syslog(LOG_ERR, "%s: address too long", 850 sep->se_service); 851 sep->se_checked = 0; 852 continue; 853 } 854 (void)unlink(sep->se_service); 855 strncpy(sep->se_ctrladdr_un.sun_path, 856 sep->se_service, n); 857 sep->se_ctrladdr_un.sun_family = AF_LOCAL; 858 sep->se_ctrladdr_size = n + 859 sizeof(sep->se_ctrladdr_un) - 860 sizeof(sep->se_ctrladdr_un.sun_path); 861 if (!ISMUX(sep)) 862 setup(sep); 863 break; 864 case AF_INET: 865 #ifdef INET6 866 case AF_INET6: 867 #endif 868 { 869 struct addrinfo hints, *res; 870 char *host, *port; 871 int error; 872 int s; 873 874 /* check if the family is supported */ 875 s = socket(sep->se_family, SOCK_DGRAM, 0); 876 if (s < 0) { 877 syslog(LOG_WARNING, 878 "%s/%s: %s: the address family is not supported by the kernel", 879 sep->se_service, sep->se_proto, 880 sep->se_hostaddr); 881 sep->se_checked = 0; 882 continue; 883 } 884 close(s); 885 886 memset(&hints, 0, sizeof(hints)); 887 hints.ai_family = sep->se_family; 888 hints.ai_socktype = sep->se_socktype; 889 hints.ai_flags = AI_PASSIVE; 890 if (!strcmp(sep->se_hostaddr, "*")) 891 host = NULL; 892 else 893 host = sep->se_hostaddr; 894 if (isrpcservice(sep) || ISMUX(sep)) 895 port = "0"; 896 else 897 port = sep->se_service; 898 error = getaddrinfo(host, port, &hints, &res); 899 if (error) { 900 if (error == EAI_SERVICE) { 901 /* gai_strerror not friendly enough */ 902 syslog(LOG_WARNING, "%s/%s: " 903 "unknown service", 904 sep->se_service, sep->se_proto); 905 } else { 906 syslog(LOG_ERR, "%s/%s: %s: %s", 907 sep->se_service, sep->se_proto, 908 sep->se_hostaddr, 909 gai_strerror(error)); 910 } 911 sep->se_checked = 0; 912 continue; 913 } 914 if (res->ai_next) { 915 syslog(LOG_ERR, 916 "%s/%s: %s: resolved to multiple addr", 917 sep->se_service, sep->se_proto, 918 sep->se_hostaddr); 919 sep->se_checked = 0; 920 freeaddrinfo(res); 921 continue; 922 } 923 memcpy(&sep->se_ctrladdr, res->ai_addr, 924 res->ai_addrlen); 925 if (ISMUX(sep)) { 926 sep->se_fd = -1; 927 freeaddrinfo(res); 928 continue; 929 } 930 sep->se_ctrladdr_size = res->ai_addrlen; 931 freeaddrinfo(res); 932 #ifdef RPC 933 if (isrpcservice(sep)) { 934 struct rpcent *rp; 935 936 sep->se_rpcprog = atoi(sep->se_service); 937 if (sep->se_rpcprog == 0) { 938 rp = getrpcbyname(sep->se_service); 939 if (rp == 0) { 940 syslog(LOG_ERR, 941 "%s/%s: unknown service", 942 sep->se_service, 943 sep->se_proto); 944 sep->se_checked = 0; 945 continue; 946 } 947 sep->se_rpcprog = rp->r_number; 948 } 949 if (sep->se_fd == -1 && !ISMUX(sep)) 950 setup(sep); 951 if (sep->se_fd != -1) 952 register_rpc(sep); 953 } else 954 #endif 955 { 956 if (sep->se_fd >= 0) 957 close_sep(sep); 958 if (sep->se_fd == -1 && !ISMUX(sep)) 959 setup(sep); 960 } 961 } 962 } 963 } 964 endconfig(); 965 /* 966 * Purge anything not looked at above. 967 */ 968 omask = sigblock(SIGBLOCK); 969 sepp = &servtab; 970 while ((sep = *sepp)) { 971 if (sep->se_checked) { 972 sepp = &sep->se_next; 973 continue; 974 } 975 *sepp = sep->se_next; 976 if (sep->se_fd >= 0) 977 close_sep(sep); 978 if (isrpcservice(sep)) 979 unregister_rpc(sep); 980 if (sep->se_family == AF_LOCAL) 981 (void)unlink(sep->se_service); 982 if (debug) 983 print_service("FREE", sep); 984 freeconfig(sep); 985 free((char *)sep); 986 } 987 (void) sigsetmask(omask); 988 } 989 990 void 991 retry(signo) 992 int signo; 993 { 994 struct servtab *sep; 995 996 timingout = 0; 997 for (sep = servtab; sep; sep = sep->se_next) { 998 if (sep->se_fd == -1 && !ISMUX(sep)) { 999 switch (sep->se_family) { 1000 case AF_LOCAL: 1001 case AF_INET: 1002 #ifdef INET6 1003 case AF_INET6: 1004 #endif 1005 setup(sep); 1006 if (sep->se_fd != -1 && isrpcservice(sep)) 1007 register_rpc(sep); 1008 break; 1009 } 1010 } 1011 } 1012 } 1013 1014 void 1015 goaway(signo) 1016 int signo; 1017 { 1018 struct servtab *sep; 1019 1020 for (sep = servtab; sep; sep = sep->se_next) { 1021 if (sep->se_fd == -1) 1022 continue; 1023 1024 switch (sep->se_family) { 1025 case AF_LOCAL: 1026 (void)unlink(sep->se_service); 1027 break; 1028 case AF_INET: 1029 #ifdef INET6 1030 case AF_INET6: 1031 #endif 1032 if (sep->se_wait == 1 && isrpcservice(sep)) 1033 unregister_rpc(sep); 1034 break; 1035 } 1036 (void)close(sep->se_fd); 1037 } 1038 exit(0); 1039 } 1040 1041 void 1042 setup(sep) 1043 struct servtab *sep; 1044 { 1045 int on = 1; 1046 1047 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) { 1048 if (debug) 1049 fprintf(stderr, "socket failed on %s/%s: %s\n", 1050 sep->se_service, sep->se_proto, strerror(errno)); 1051 syslog(LOG_ERR, "%s/%s: socket: %m", 1052 sep->se_service, sep->se_proto); 1053 return; 1054 } 1055 /* Set all listening sockets to close-on-exec. */ 1056 if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) 1057 syslog(LOG_ERR, "fcntl (F_SETFD, FD_CLOEXEC): %m"); 1058 1059 #define turnon(fd, opt) \ 1060 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 1061 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 1062 turnon(sep->se_fd, SO_DEBUG) < 0) 1063 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 1064 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 1065 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 1066 #undef turnon 1067 1068 /* Set the socket buffer sizes, if specified. */ 1069 if (sep->se_sndbuf != 0 && setsockopt(sep->se_fd, SOL_SOCKET, 1070 SO_SNDBUF, (char *)&sep->se_sndbuf, sizeof(sep->se_sndbuf)) < 0) 1071 syslog(LOG_ERR, "setsockopt (SO_SNDBUF %d): %m", 1072 sep->se_sndbuf); 1073 if (sep->se_rcvbuf != 0 && setsockopt(sep->se_fd, SOL_SOCKET, 1074 SO_RCVBUF, (char *)&sep->se_rcvbuf, sizeof(sep->se_rcvbuf)) < 0) 1075 syslog(LOG_ERR, "setsockopt (SO_RCVBUF %d): %m", 1076 sep->se_rcvbuf); 1077 if (sep->se_type == FAITH_TYPE && setsockopt(sep->se_fd, IPPROTO_IPV6, 1078 IPV6_FAITH, (char *)&on, sizeof(on)) < 0) 1079 syslog(LOG_ERR, "setsockopt (IPV6_FAITH): %m"); 1080 #ifdef IPSEC 1081 if (ipsecsetup(sep->se_family, sep->se_fd, sep->se_policy) < 0 && 1082 sep->se_policy) { 1083 syslog(LOG_ERR, "%s/%s: ipsec setup failed", 1084 sep->se_service, sep->se_proto); 1085 (void)close(sep->se_fd); 1086 sep->se_fd = -1; 1087 return; 1088 } 1089 #endif 1090 1091 if (bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size) < 0) { 1092 if (debug) 1093 fprintf(stderr, "bind failed on %s/%s: %s\n", 1094 sep->se_service, sep->se_proto, strerror(errno)); 1095 syslog(LOG_ERR, "%s/%s: bind: %m", 1096 sep->se_service, sep->se_proto); 1097 (void) close(sep->se_fd); 1098 sep->se_fd = -1; 1099 if (!timingout) { 1100 timingout = 1; 1101 alarm(RETRYTIME); 1102 } 1103 return; 1104 } 1105 if (sep->se_socktype == SOCK_STREAM) 1106 listen(sep->se_fd, 10); 1107 1108 FD_SET(sep->se_fd, &allsock); 1109 nsock++; 1110 if (sep->se_fd > maxsock) { 1111 maxsock = sep->se_fd; 1112 if (maxsock > rlim_ofile_cur - FD_MARGIN) 1113 bump_nofile(); 1114 } 1115 if (debug) 1116 fprintf(stderr, "registered %s on %d\n", 1117 sep->se_server, sep->se_fd); 1118 } 1119 1120 /* 1121 * Finish with a service and its socket. 1122 */ 1123 void 1124 close_sep(sep) 1125 struct servtab *sep; 1126 { 1127 if (sep->se_fd >= 0) { 1128 nsock--; 1129 FD_CLR(sep->se_fd, &allsock); 1130 (void) close(sep->se_fd); 1131 sep->se_fd = -1; 1132 } 1133 sep->se_count = 0; 1134 /* 1135 * Don't keep the pid of this running daemon: when reapchild() 1136 * reaps this pid, it would erroneously increment nsock. 1137 */ 1138 if (sep->se_wait > 1) 1139 sep->se_wait = 1; 1140 } 1141 1142 void 1143 register_rpc(sep) 1144 struct servtab *sep; 1145 { 1146 #ifdef RPC 1147 int n; 1148 struct netbuf nbuf; 1149 struct sockaddr_storage ss; 1150 struct netconfig *nconf; 1151 1152 if ((nconf = getnetconfigent(sep->se_proto+4)) == NULL) { 1153 syslog(LOG_ERR, "%s: getnetconfigent failed", 1154 sep->se_proto); 1155 return; 1156 } 1157 n = sizeof ss; 1158 if (getsockname(sep->se_fd, (struct sockaddr *)&ss, &n) < 0) { 1159 syslog(LOG_ERR, "%s/%s: getsockname: %m", 1160 sep->se_service, sep->se_proto); 1161 return; 1162 } 1163 1164 nbuf.buf = &ss; 1165 nbuf.len = ss.ss_len; 1166 nbuf.maxlen = sizeof (struct sockaddr_storage); 1167 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1168 if (debug) 1169 fprintf(stderr, "rpcb_set: %u %d %s %s\n", 1170 sep->se_rpcprog, n, nconf->nc_netid, 1171 taddr2uaddr(nconf, &nbuf)); 1172 (void)rpcb_unset(sep->se_rpcprog, n, nconf); 1173 if (!rpcb_set(sep->se_rpcprog, n, nconf, &nbuf)) 1174 syslog(LOG_ERR, "rpcb_set: %u %d %s %s%s", 1175 sep->se_rpcprog, n, nconf->nc_netid, 1176 taddr2uaddr(nconf, &nbuf), clnt_spcreateerror("")); 1177 } 1178 #endif /* RPC */ 1179 } 1180 1181 void 1182 unregister_rpc(sep) 1183 struct servtab *sep; 1184 { 1185 #ifdef RPC 1186 int n; 1187 struct netconfig *nconf; 1188 1189 if ((nconf = getnetconfigent(sep->se_proto+4)) == NULL) { 1190 syslog(LOG_ERR, "%s: getnetconfigent failed", 1191 sep->se_proto); 1192 return; 1193 } 1194 1195 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1196 if (debug) 1197 fprintf(stderr, "rpcb_unset(%u, %d, %s)\n", 1198 sep->se_rpcprog, n, nconf->nc_netid); 1199 if (!rpcb_unset(sep->se_rpcprog, n, nconf)) 1200 syslog(LOG_ERR, "rpcb_unset(%u, %d, %s) failed\n", 1201 sep->se_rpcprog, n, nconf->nc_netid); 1202 } 1203 #endif /* RPC */ 1204 } 1205 1206 1207 struct servtab * 1208 enter(cp) 1209 struct servtab *cp; 1210 { 1211 struct servtab *sep; 1212 long omask; 1213 1214 sep = (struct servtab *)malloc(sizeof (*sep)); 1215 if (sep == (struct servtab *)0) { 1216 syslog(LOG_ERR, "Out of memory."); 1217 exit(1); 1218 } 1219 *sep = *cp; 1220 sep->se_fd = -1; 1221 sep->se_rpcprog = -1; 1222 omask = sigblock(SIGBLOCK); 1223 sep->se_next = servtab; 1224 servtab = sep; 1225 sigsetmask(omask); 1226 return (sep); 1227 } 1228 1229 FILE *fconfig = NULL; 1230 struct servtab serv; 1231 char line[LINE_MAX]; 1232 char *defhost; 1233 #ifdef IPSEC 1234 static char *policy = NULL; 1235 #endif 1236 1237 int 1238 setconfig() 1239 { 1240 if (defhost) 1241 free(defhost); 1242 defhost = newstr("*"); 1243 #ifdef IPSEC 1244 if (policy) 1245 free(policy); 1246 policy = NULL; 1247 #endif 1248 if (fconfig != NULL) { 1249 fseek(fconfig, 0L, SEEK_SET); 1250 return (1); 1251 } 1252 fconfig = fopen(CONFIG, "r"); 1253 return (fconfig != NULL); 1254 } 1255 1256 void 1257 endconfig() 1258 { 1259 if (fconfig) { 1260 (void) fclose(fconfig); 1261 fconfig = NULL; 1262 } 1263 if (defhost) { 1264 free(defhost); 1265 defhost = 0; 1266 } 1267 } 1268 1269 struct servtab * 1270 getconfigent() 1271 { 1272 struct servtab *sep = &serv; 1273 int argc, val; 1274 char *cp, *cp0, *arg, *buf0, *buf1, *sz0, *sz1; 1275 static char TCPMUX_TOKEN[] = "tcpmux/"; 1276 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) 1277 char *hostdelim; 1278 1279 more: 1280 while ((cp = nextline(fconfig))) { 1281 #ifdef IPSEC 1282 /* lines starting with #@ is not a comment, but the policy */ 1283 if (cp[0] == '#' && cp[1] == '@') { 1284 char *p; 1285 for (p = cp + 2; p && *p && isspace(*p); p++) 1286 ; 1287 if (*p == '\0') { 1288 if (policy) 1289 free(policy); 1290 policy = NULL; 1291 } else { 1292 if (ipsecsetup_test(p) < 0) { 1293 syslog(LOG_ERR, 1294 "%s: invalid ipsec policy \"%s\"", 1295 CONFIG, p); 1296 exit(1); 1297 } else { 1298 if (policy) 1299 free(policy); 1300 policy = newstr(p); 1301 } 1302 } 1303 } 1304 #endif 1305 if (*cp == '#' || *cp == '\0') 1306 continue; 1307 #ifdef MULOG 1308 /* Avoid use of `skip' if there is a danger of it looking 1309 * at continuation lines. 1310 */ 1311 do { 1312 cp++; 1313 } while (*cp == ' ' || *cp == '\t'); 1314 if (*cp == '\0') 1315 continue; 1316 if ((arg = skip(&cp)) == NULL) 1317 continue; 1318 if (strcmp(arg, "DOMAIN")) 1319 continue; 1320 if (curdom) 1321 free(curdom); 1322 curdom = NULL; 1323 while (*cp == ' ' || *cp == '\t') 1324 cp++; 1325 if (*cp == '\0') 1326 continue; 1327 arg = cp; 1328 while (*cp && *cp != ' ' && *cp != '\t') 1329 cp++; 1330 if (*cp != '\0') 1331 *cp++ = '\0'; 1332 curdom = newstr(arg); 1333 #endif 1334 break; 1335 } 1336 if (cp == NULL) 1337 return ((struct servtab *)0); 1338 /* 1339 * clear the static buffer, since some fields (se_ctrladdr, 1340 * for example) don't get initialized here. 1341 */ 1342 memset((caddr_t)sep, 0, sizeof *sep); 1343 arg = skip(&cp); 1344 if (cp == NULL) { 1345 /* got an empty line containing just blanks/tabs. */ 1346 goto more; 1347 } 1348 /* Check for a host name. */ 1349 hostdelim = strrchr(arg, ':'); 1350 if (hostdelim) { 1351 *hostdelim = '\0'; 1352 if (arg[0] == '[' && hostdelim > arg && hostdelim[-1] == ']') { 1353 hostdelim[-1] = '\0'; 1354 sep->se_hostaddr = newstr(arg + 1); 1355 } else 1356 sep->se_hostaddr = newstr(arg); 1357 arg = hostdelim + 1; 1358 /* 1359 * If the line is of the form `host:', then just change the 1360 * default host for the following lines. 1361 */ 1362 if (*arg == '\0') { 1363 arg = skip(&cp); 1364 if (cp == NULL) { 1365 free(defhost); 1366 defhost = sep->se_hostaddr; 1367 goto more; 1368 } 1369 } 1370 } else 1371 sep->se_hostaddr = newstr(defhost); 1372 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1373 char *c = arg + MUX_LEN; 1374 if (*c == '+') { 1375 sep->se_type = MUXPLUS_TYPE; 1376 c++; 1377 } else 1378 sep->se_type = MUX_TYPE; 1379 sep->se_service = newstr(c); 1380 } else { 1381 sep->se_service = newstr(arg); 1382 sep->se_type = NORM_TYPE; 1383 } 1384 1385 arg = sskip(&cp); 1386 if (strcmp(arg, "stream") == 0) 1387 sep->se_socktype = SOCK_STREAM; 1388 else if (strcmp(arg, "dgram") == 0) 1389 sep->se_socktype = SOCK_DGRAM; 1390 else if (strcmp(arg, "rdm") == 0) 1391 sep->se_socktype = SOCK_RDM; 1392 else if (strcmp(arg, "seqpacket") == 0) 1393 sep->se_socktype = SOCK_SEQPACKET; 1394 else if (strcmp(arg, "raw") == 0) 1395 sep->se_socktype = SOCK_RAW; 1396 else 1397 sep->se_socktype = -1; 1398 1399 arg = sskip(&cp); 1400 if (sep->se_type == NORM_TYPE && 1401 strncmp(arg, "faith/", strlen("faith/")) == 0) { 1402 arg += strlen("faith/"); 1403 sep->se_type = FAITH_TYPE; 1404 } 1405 sep->se_proto = newstr(arg); 1406 1407 #define MALFORMED(arg) \ 1408 do { \ 1409 syslog(LOG_ERR, "%s: malformed buffer size option `%s'", \ 1410 sep->se_service, (arg)); \ 1411 goto more; \ 1412 } while (0) 1413 1414 #define GETVAL(arg) \ 1415 do { \ 1416 if (!isdigit(*(arg))) \ 1417 MALFORMED(arg); \ 1418 val = strtol((arg), &cp0, 10); \ 1419 if (cp0 != NULL) { \ 1420 if (cp0[1] != '\0') \ 1421 MALFORMED((arg)); \ 1422 if (cp0[0] == 'k') \ 1423 val *= 1024; \ 1424 if (cp0[0] == 'm') \ 1425 val *= 1024 * 1024; \ 1426 } \ 1427 if (val < 1) { \ 1428 syslog(LOG_ERR, "%s: invalid buffer size `%s'", \ 1429 sep->se_service, (arg)); \ 1430 goto more; \ 1431 } \ 1432 } while (0) 1433 1434 #define ASSIGN(arg) \ 1435 do { \ 1436 if (strcmp((arg), "sndbuf") == 0) \ 1437 sep->se_sndbuf = val; \ 1438 else if (strcmp((arg), "rcvbuf") == 0) \ 1439 sep->se_rcvbuf = val; \ 1440 else \ 1441 MALFORMED((arg)); \ 1442 } while (0) 1443 1444 /* 1445 * Extract the send and receive buffer sizes before parsing 1446 * the protocol. 1447 */ 1448 sep->se_sndbuf = sep->se_rcvbuf = 0; 1449 buf0 = buf1 = sz0 = sz1 = NULL; 1450 if ((buf0 = strchr(sep->se_proto, ',')) != NULL) { 1451 /* Not meaningful for Tcpmux services. */ 1452 if (ISMUX(sep)) { 1453 syslog(LOG_ERR, "%s: can't specify buffer sizes for " 1454 "tcpmux services", sep->se_service); 1455 goto more; 1456 } 1457 1458 /* Skip the , */ 1459 *buf0++ = '\0'; 1460 1461 /* Check to see if another socket buffer size was specified. */ 1462 if ((buf1 = strchr(buf0, ',')) != NULL) { 1463 /* Skip the , */ 1464 *buf1++ = '\0'; 1465 1466 /* Make sure a 3rd one wasn't specified. */ 1467 if (strchr(buf1, ',') != NULL) { 1468 syslog(LOG_ERR, "%s: too many buffer sizes", 1469 sep->se_service); 1470 goto more; 1471 } 1472 1473 /* Locate the size. */ 1474 if ((sz1 = strchr(buf1, '=')) == NULL) 1475 MALFORMED(buf1); 1476 1477 /* Skip the = */ 1478 *sz1++ = '\0'; 1479 } 1480 1481 /* Locate the size. */ 1482 if ((sz0 = strchr(buf0, '=')) == NULL) 1483 MALFORMED(buf0); 1484 1485 /* Skip the = */ 1486 *sz0++ = '\0'; 1487 1488 GETVAL(sz0); 1489 ASSIGN(buf0); 1490 1491 if (buf1 != NULL) { 1492 GETVAL(sz1); 1493 ASSIGN(buf1); 1494 } 1495 } 1496 1497 #undef ASSIGN 1498 #undef GETVAL 1499 #undef MALFORMED 1500 1501 if (strcmp(sep->se_proto, "unix") == 0) { 1502 sep->se_family = AF_LOCAL; 1503 } else { 1504 val = strlen(sep->se_proto); 1505 if (!val) { 1506 syslog(LOG_ERR, "%s: invalid protocol specified", 1507 sep->se_service); 1508 goto more; 1509 } 1510 val = sep->se_proto[val - 1]; 1511 switch (val) { 1512 case '4': /*tcp4 or udp4*/ 1513 sep->se_family = AF_INET; 1514 break; 1515 #ifdef INET6 1516 case '6': /*tcp6 or udp6*/ 1517 sep->se_family = AF_INET6; 1518 break; 1519 #endif 1520 default: 1521 sep->se_family = AF_INET; /*will become AF_INET6*/ 1522 break; 1523 } 1524 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1525 #ifdef RPC 1526 char *cp, *ccp; 1527 cp = strchr(sep->se_service, '/'); 1528 if (cp == 0) { 1529 syslog(LOG_ERR, "%s: no rpc version", 1530 sep->se_service); 1531 goto more; 1532 } 1533 *cp++ = '\0'; 1534 sep->se_rpcversl = sep->se_rpcversh = 1535 strtol(cp, &ccp, 0); 1536 if (ccp == cp) { 1537 badafterall: 1538 syslog(LOG_ERR, "%s/%s: bad rpc version", 1539 sep->se_service, cp); 1540 goto more; 1541 } 1542 if (*ccp == '-') { 1543 cp = ccp + 1; 1544 sep->se_rpcversh = strtol(cp, &ccp, 0); 1545 if (ccp == cp) 1546 goto badafterall; 1547 } 1548 #else 1549 syslog(LOG_ERR, "%s: rpc services not suported", 1550 sep->se_service); 1551 goto more; 1552 #endif /* RPC */ 1553 } 1554 } 1555 arg = sskip(&cp); 1556 { 1557 char *cp; 1558 if ((cp = strchr(arg, ':')) == NULL) 1559 cp = strchr(arg, '.'); 1560 if (cp != NULL) { 1561 *cp++ = '\0'; 1562 sep->se_max = atoi(cp); 1563 } else 1564 sep->se_max = TOOMANY; 1565 } 1566 sep->se_wait = strcmp(arg, "wait") == 0; 1567 if (ISMUX(sep)) { 1568 /* 1569 * Silently enforce "nowait" for TCPMUX services since 1570 * they don't have an assigned port to listen on. 1571 */ 1572 sep->se_wait = 0; 1573 1574 if (strncmp(sep->se_proto, "tcp", 3)) { 1575 syslog(LOG_ERR, 1576 "%s: bad protocol for tcpmux service %s", 1577 CONFIG, sep->se_service); 1578 goto more; 1579 } 1580 if (sep->se_socktype != SOCK_STREAM) { 1581 syslog(LOG_ERR, 1582 "%s: bad socket type for tcpmux service %s", 1583 CONFIG, sep->se_service); 1584 goto more; 1585 } 1586 } 1587 sep->se_user = newstr(sskip(&cp)); 1588 if ((sep->se_group = strchr(sep->se_user, ':')) != NULL) 1589 *sep->se_group++ = '\0'; 1590 else if ((sep->se_group = strchr(sep->se_user, '.')) != NULL) 1591 *sep->se_group++ = '\0'; 1592 1593 sep->se_server = newstr(sskip(&cp)); 1594 if (strcmp(sep->se_server, "internal") == 0) { 1595 struct biltin *bi; 1596 1597 for (bi = biltins; bi->bi_service; bi++) 1598 if (bi->bi_socktype == sep->se_socktype && 1599 strcmp(bi->bi_service, sep->se_service) == 0) 1600 break; 1601 if (bi->bi_service == 0) { 1602 syslog(LOG_ERR, "internal service %s unknown", 1603 sep->se_service); 1604 goto more; 1605 } 1606 sep->se_bi = bi; 1607 sep->se_wait = bi->bi_wait; 1608 } else 1609 sep->se_bi = NULL; 1610 argc = 0; 1611 for (arg = skip(&cp); cp; arg = skip(&cp)) { 1612 #if MULOG 1613 char *colon; 1614 1615 if (argc == 0 && (colon = strrchr(arg, ':'))) { 1616 while (arg < colon) { 1617 int x; 1618 char *ccp; 1619 1620 switch (*arg++) { 1621 case 'l': 1622 x = 1; 1623 if (isdigit(*arg)) { 1624 x = strtol(arg, &ccp, 0); 1625 if (ccp == arg) 1626 break; 1627 arg = ccp; 1628 } 1629 sep->se_log &= ~MULOG_RFC931; 1630 sep->se_log |= x; 1631 break; 1632 case 'a': 1633 sep->se_log |= MULOG_RFC931; 1634 break; 1635 default: 1636 break; 1637 } 1638 } 1639 arg = colon + 1; 1640 } 1641 #endif 1642 if (argc < MAXARGV) 1643 sep->se_argv[argc++] = newstr(arg); 1644 } 1645 while (argc <= MAXARGV) 1646 sep->se_argv[argc++] = NULL; 1647 #ifdef IPSEC 1648 sep->se_policy = policy ? newstr(policy) : NULL; 1649 #endif 1650 return (sep); 1651 } 1652 1653 void 1654 freeconfig(cp) 1655 struct servtab *cp; 1656 { 1657 int i; 1658 1659 if (cp->se_hostaddr) 1660 free(cp->se_hostaddr); 1661 if (cp->se_service) 1662 free(cp->se_service); 1663 if (cp->se_proto) 1664 free(cp->se_proto); 1665 if (cp->se_user) 1666 free(cp->se_user); 1667 /* Note: se_group is part of the newstr'ed se_user */ 1668 if (cp->se_server) 1669 free(cp->se_server); 1670 for (i = 0; i < MAXARGV; i++) 1671 if (cp->se_argv[i]) 1672 free(cp->se_argv[i]); 1673 #ifdef IPSEC 1674 if (cp->se_policy) 1675 free(cp->se_policy); 1676 #endif 1677 } 1678 1679 1680 /* 1681 * Safe skip - if skip returns null, log a syntax error in the 1682 * configuration file and exit. 1683 */ 1684 char * 1685 sskip(cpp) 1686 char **cpp; 1687 { 1688 char *cp; 1689 1690 cp = skip(cpp); 1691 if (cp == NULL) { 1692 syslog(LOG_ERR, "%s: syntax error", CONFIG); 1693 exit(1); 1694 } 1695 return (cp); 1696 } 1697 1698 char * 1699 skip(cpp) 1700 char **cpp; 1701 { 1702 char *cp = *cpp; 1703 char *start; 1704 1705 if (*cpp == NULL) 1706 return ((char *)0); 1707 1708 again: 1709 while (*cp == ' ' || *cp == '\t') 1710 cp++; 1711 if (*cp == '\0') { 1712 int c; 1713 1714 c = getc(fconfig); 1715 (void) ungetc(c, fconfig); 1716 if (c == ' ' || c == '\t') 1717 if ((cp = nextline(fconfig))) 1718 goto again; 1719 *cpp = (char *)0; 1720 return ((char *)0); 1721 } 1722 start = cp; 1723 while (*cp && *cp != ' ' && *cp != '\t') 1724 cp++; 1725 if (*cp != '\0') 1726 *cp++ = '\0'; 1727 *cpp = cp; 1728 return (start); 1729 } 1730 1731 char * 1732 nextline(fd) 1733 FILE *fd; 1734 { 1735 char *cp; 1736 1737 if (fgets(line, sizeof (line), fd) == NULL) 1738 return ((char *)0); 1739 cp = strchr(line, '\n'); 1740 if (cp) 1741 *cp = '\0'; 1742 return (line); 1743 } 1744 1745 char * 1746 newstr(cp) 1747 char *cp; 1748 { 1749 if ((cp = strdup(cp ? cp : ""))) 1750 return (cp); 1751 syslog(LOG_ERR, "strdup: %m"); 1752 exit(1); 1753 } 1754 1755 void 1756 inetd_setproctitle(a, s) 1757 char *a; 1758 int s; 1759 { 1760 socklen_t size; 1761 struct sockaddr_storage ss; 1762 char hbuf[NI_MAXHOST]; 1763 1764 size = sizeof(ss); 1765 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) { 1766 if (getnameinfo((struct sockaddr *)&ss, size, hbuf, 1767 sizeof(hbuf), NULL, 0, niflags) == 0) 1768 setproctitle("-%s [%s]", a, hbuf); 1769 else 1770 setproctitle("-%s [?]", a); 1771 } else 1772 setproctitle("-%s", a); 1773 } 1774 1775 void 1776 bump_nofile() 1777 { 1778 #ifdef RLIMIT_NOFILE 1779 1780 #define FD_CHUNK 32 1781 1782 struct rlimit rl; 1783 1784 if (getrlimit(RLIMIT_NOFILE, &rl) < 0) { 1785 syslog(LOG_ERR, "getrlimit: %m"); 1786 return; 1787 } 1788 rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK); 1789 if (rl.rlim_cur <= rlim_ofile_cur) { 1790 syslog(LOG_ERR, 1791 "bump_nofile: cannot extend file limit, max = %d", 1792 (int)rl.rlim_cur); 1793 return; 1794 } 1795 1796 if (setrlimit(RLIMIT_NOFILE, &rl) < 0) { 1797 syslog(LOG_ERR, "setrlimit: %m"); 1798 return; 1799 } 1800 1801 rlim_ofile_cur = rl.rlim_cur; 1802 return; 1803 1804 #else 1805 syslog(LOG_ERR, "bump_nofile: cannot extend file limit"); 1806 return; 1807 #endif 1808 } 1809 1810 /* 1811 * Internet services provided internally by inetd: 1812 */ 1813 #define BUFSIZE 4096 1814 1815 /* ARGSUSED */ 1816 void 1817 echo_stream(s, sep) /* Echo service -- echo data back */ 1818 int s; 1819 struct servtab *sep; 1820 { 1821 char buffer[BUFSIZE]; 1822 int i; 1823 1824 inetd_setproctitle(sep->se_service, s); 1825 while ((i = read(s, buffer, sizeof(buffer))) > 0 && 1826 write(s, buffer, i) > 0) 1827 ; 1828 } 1829 1830 /* ARGSUSED */ 1831 void 1832 echo_dg(s, sep) /* Echo service -- echo data back */ 1833 int s; 1834 struct servtab *sep; 1835 { 1836 char buffer[BUFSIZE]; 1837 int i; 1838 socklen_t size; 1839 struct sockaddr_storage ss; 1840 struct sockaddr *sa; 1841 1842 sa = (struct sockaddr *)&ss; 1843 size = sizeof(ss); 1844 if ((i = recvfrom(s, buffer, sizeof(buffer), 0, sa, &size)) < 0) 1845 return; 1846 if (port_good_dg(sa)) 1847 (void) sendto(s, buffer, i, 0, sa, size); 1848 } 1849 1850 /* ARGSUSED */ 1851 void 1852 discard_stream(s, sep) /* Discard service -- ignore data */ 1853 int s; 1854 struct servtab *sep; 1855 { 1856 char buffer[BUFSIZE]; 1857 1858 inetd_setproctitle(sep->se_service, s); 1859 while ((errno = 0, read(s, buffer, sizeof(buffer)) > 0) || 1860 errno == EINTR) 1861 ; 1862 } 1863 1864 /* ARGSUSED */ 1865 void 1866 discard_dg(s, sep) /* Discard service -- ignore data */ 1867 int s; 1868 struct servtab *sep; 1869 { 1870 char buffer[BUFSIZE]; 1871 1872 (void) read(s, buffer, sizeof(buffer)); 1873 } 1874 1875 #include <ctype.h> 1876 #define LINESIZ 72 1877 char ring[128]; 1878 char *endring; 1879 1880 void 1881 initring() 1882 { 1883 int i; 1884 1885 endring = ring; 1886 1887 for (i = 0; i <= 128; ++i) 1888 if (isprint(i)) 1889 *endring++ = i; 1890 } 1891 1892 /* ARGSUSED */ 1893 void 1894 chargen_stream(s, sep) /* Character generator */ 1895 int s; 1896 struct servtab *sep; 1897 { 1898 int len; 1899 char *rs, text[LINESIZ+2]; 1900 1901 inetd_setproctitle(sep->se_service, s); 1902 1903 if (!endring) { 1904 initring(); 1905 rs = ring; 1906 } 1907 1908 text[LINESIZ] = '\r'; 1909 text[LINESIZ + 1] = '\n'; 1910 for (rs = ring;;) { 1911 if ((len = endring - rs) >= LINESIZ) 1912 memmove(text, rs, LINESIZ); 1913 else { 1914 memmove(text, rs, len); 1915 memmove(text + len, ring, LINESIZ - len); 1916 } 1917 if (++rs == endring) 1918 rs = ring; 1919 if (write(s, text, sizeof(text)) != sizeof(text)) 1920 break; 1921 } 1922 } 1923 1924 /* ARGSUSED */ 1925 void 1926 chargen_dg(s, sep) /* Character generator */ 1927 int s; 1928 struct servtab *sep; 1929 { 1930 struct sockaddr_storage ss; 1931 struct sockaddr *sa; 1932 static char *rs; 1933 int len; 1934 socklen_t size; 1935 char text[LINESIZ+2]; 1936 1937 if (endring == 0) { 1938 initring(); 1939 rs = ring; 1940 } 1941 1942 sa = (struct sockaddr *)&ss; 1943 size = sizeof(ss); 1944 if (recvfrom(s, text, sizeof(text), 0, sa, &size) < 0) 1945 return; 1946 1947 if (!port_good_dg(sa)) 1948 return; 1949 1950 if ((len = endring - rs) >= LINESIZ) 1951 memmove(text, rs, LINESIZ); 1952 else { 1953 memmove(text, rs, len); 1954 memmove(text + len, ring, LINESIZ - len); 1955 } 1956 if (++rs == endring) 1957 rs = ring; 1958 text[LINESIZ] = '\r'; 1959 text[LINESIZ + 1] = '\n'; 1960 (void) sendto(s, text, sizeof(text), 0, sa, size); 1961 } 1962 1963 /* 1964 * Return a machine readable date and time, in the form of the 1965 * number of seconds since midnight, Jan 1, 1900. Since gettimeofday 1966 * returns the number of seconds since midnight, Jan 1, 1970, 1967 * we must add 2208988800 seconds to this figure to make up for 1968 * some seventy years Bell Labs was asleep. 1969 */ 1970 1971 uint32_t 1972 machtime() 1973 { 1974 struct timeval tv; 1975 1976 if (gettimeofday(&tv, (struct timezone *)0) < 0) { 1977 if (debug) 1978 fprintf(stderr, "Unable to get time of day\n"); 1979 return (0); 1980 } 1981 #define OFFSET ((uint32_t)25567 * 24*60*60) 1982 return (htonl((uint32_t)(tv.tv_sec + OFFSET))); 1983 #undef OFFSET 1984 } 1985 1986 /* ARGSUSED */ 1987 void 1988 machtime_stream(s, sep) 1989 int s; 1990 struct servtab *sep; 1991 { 1992 uint32_t result; 1993 1994 result = machtime(); 1995 (void) write(s, (char *) &result, sizeof(result)); 1996 } 1997 1998 /* ARGSUSED */ 1999 void 2000 machtime_dg(s, sep) 2001 int s; 2002 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 void 2021 daytime_stream(s, sep) /* Return human-readable time of day */ 2022 int s; 2023 struct servtab *sep; 2024 { 2025 char buffer[256]; 2026 time_t clock; 2027 int len; 2028 2029 clock = time((time_t *) 0); 2030 2031 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 2032 (void) write(s, buffer, len); 2033 } 2034 2035 /* ARGSUSED */ 2036 void 2037 daytime_dg(s, sep) /* Return human-readable time of day */ 2038 int s; 2039 struct servtab *sep; 2040 { 2041 char buffer[256]; 2042 time_t clock; 2043 struct sockaddr_storage ss; 2044 struct sockaddr *sa; 2045 socklen_t size; 2046 int len; 2047 2048 clock = time((time_t *) 0); 2049 2050 sa = (struct sockaddr *)&ss; 2051 size = sizeof(ss); 2052 if (recvfrom(s, buffer, sizeof(buffer), 0, sa, &size) < 0) 2053 return; 2054 if (!port_good_dg(sa)) 2055 return; 2056 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 2057 (void) sendto(s, buffer, len, 0, sa, size); 2058 } 2059 2060 /* 2061 * print_service: 2062 * Dump relevant information to stderr 2063 */ 2064 void 2065 print_service(action, sep) 2066 char *action; 2067 struct servtab *sep; 2068 { 2069 2070 if (isrpcservice(sep)) 2071 fprintf(stderr, 2072 "%s: %s rpcprog=%d, rpcvers = %d/%d, proto=%s, wait:max=%d.%d, user:group=%s.%s builtin=%lx server=%s" 2073 #ifdef IPSEC 2074 " policy=\"%s\"" 2075 #endif 2076 "\n", 2077 action, sep->se_service, 2078 sep->se_rpcprog, sep->se_rpcversh, sep->se_rpcversl, sep->se_proto, 2079 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 2080 (long)sep->se_bi, sep->se_server 2081 #ifdef IPSEC 2082 , (sep->se_policy ? sep->se_policy : "") 2083 #endif 2084 ); 2085 else 2086 fprintf(stderr, 2087 "%s: %s proto=%s%s, wait:max=%d.%d, user:group=%s.%s builtin=%lx server=%s" 2088 #ifdef IPSEC 2089 " policy=%s" 2090 #endif 2091 "\n", 2092 action, sep->se_service, 2093 sep->se_type == FAITH_TYPE ? "faith/" : "", 2094 sep->se_proto, 2095 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 2096 (long)sep->se_bi, sep->se_server 2097 #ifdef IPSEC 2098 , (sep->se_policy ? sep->se_policy : "") 2099 #endif 2100 ); 2101 } 2102 2103 void 2104 usage() 2105 { 2106 2107 #ifdef LIBWRAP 2108 (void)fprintf(stderr, "usage: %s [-dl] [conf]\n", getprogname()); 2109 #else 2110 (void)fprintf(stderr, "usage: %s [-d] [conf]\n", getprogname()); 2111 #endif 2112 exit(1); 2113 } 2114 2115 2116 /* 2117 * Based on TCPMUX.C by Mark K. Lottor November 1988 2118 * sri-nic::ps:<mkl>tcpmux.c 2119 */ 2120 2121 static int /* # of characters upto \r,\n or \0 */ 2122 getline(fd, buf, len) 2123 int fd; 2124 char *buf; 2125 int len; 2126 { 2127 int count = 0, n; 2128 2129 do { 2130 n = read(fd, buf, len-count); 2131 if (n == 0) 2132 return (count); 2133 if (n < 0) 2134 return (-1); 2135 while (--n >= 0) { 2136 if (*buf == '\r' || *buf == '\n' || *buf == '\0') 2137 return (count); 2138 count++; 2139 buf++; 2140 } 2141 } while (count < len); 2142 return (count); 2143 } 2144 2145 #define MAX_SERV_LEN (256+2) /* 2 bytes for \r\n */ 2146 2147 #define strwrite(fd, buf) (void) write(fd, buf, sizeof(buf)-1) 2148 2149 void 2150 tcpmux(ctrl, sep) 2151 int ctrl; 2152 struct servtab *sep; 2153 { 2154 char service[MAX_SERV_LEN+1]; 2155 int len; 2156 2157 /* Get requested service name */ 2158 if ((len = getline(ctrl, service, MAX_SERV_LEN)) < 0) { 2159 strwrite(ctrl, "-Error reading service name\r\n"); 2160 goto reject; 2161 } 2162 service[len] = '\0'; 2163 2164 if (debug) 2165 fprintf(stderr, "tcpmux: someone wants %s\n", service); 2166 2167 /* 2168 * Help is a required command, and lists available services, 2169 * one per line. 2170 */ 2171 if (!strcasecmp(service, "help")) { 2172 strwrite(ctrl, "+Available services:\r\n"); 2173 strwrite(ctrl, "help\r\n"); 2174 for (sep = servtab; sep; sep = sep->se_next) { 2175 if (!ISMUX(sep)) 2176 continue; 2177 (void)write(ctrl, sep->se_service, 2178 strlen(sep->se_service)); 2179 strwrite(ctrl, "\r\n"); 2180 } 2181 goto reject; 2182 } 2183 2184 /* Try matching a service in inetd.conf with the request */ 2185 for (sep = servtab; sep; sep = sep->se_next) { 2186 if (!ISMUX(sep)) 2187 continue; 2188 if (!strcasecmp(service, sep->se_service)) { 2189 if (ISMUXPLUS(sep)) 2190 strwrite(ctrl, "+Go\r\n"); 2191 run_service(ctrl, sep); 2192 return; 2193 } 2194 } 2195 strwrite(ctrl, "-Service not available\r\n"); 2196 reject: 2197 _exit(1); 2198 } 2199 2200 #ifdef MULOG 2201 void 2202 dolog(sep, ctrl) 2203 struct servtab *sep; 2204 int ctrl; 2205 { 2206 struct sockaddr_storage ss; 2207 struct sockaddr *sa = (struct sockaddr *)&ss; 2208 socklen_t len = sizeof(ss); 2209 char *host, *dp, buf[BUFSIZ]; 2210 int connected = 1; 2211 2212 switch (sep->se_family) { 2213 case AF_INET: 2214 #ifdef INET6 2215 case AF_INET6: 2216 #endif 2217 break; 2218 default: 2219 return; 2220 } 2221 2222 if (getpeername(ctrl, sa, &len) < 0) { 2223 if (errno != ENOTCONN) { 2224 syslog(LOG_ERR, "getpeername: %m"); 2225 return; 2226 } 2227 if (recvfrom(ctrl, buf, sizeof(buf), MSG_PEEK, sa, &len) < 0) { 2228 syslog(LOG_ERR, "recvfrom: %m"); 2229 return; 2230 } 2231 connected = 0; 2232 } 2233 switch (sa->sa_family) { 2234 case AF_INET: 2235 #ifdef INET6 2236 case AF_INET6: 2237 #endif 2238 break; 2239 default: 2240 syslog(LOG_ERR, "unexpected address family %u", sa->sa_family); 2241 return; 2242 } 2243 2244 if (getnameinfo(sa, len, buf, sizeof(buf), NULL, 0, 0) != 0) 2245 strcpy(buf, "?"); 2246 host = buf; 2247 2248 switch (sep->se_log & ~MULOG_RFC931) { 2249 case 0: 2250 return; 2251 case 1: 2252 if (curdom == NULL || *curdom == '\0') 2253 break; 2254 dp = host + strlen(host) - strlen(curdom); 2255 if (dp < host) 2256 break; 2257 if (debug) 2258 fprintf(stderr, "check \"%s\" against curdom \"%s\"\n", 2259 host, curdom); 2260 if (strcasecmp(dp, curdom) == 0) 2261 return; 2262 break; 2263 case 2: 2264 default: 2265 break; 2266 } 2267 2268 openlog("", LOG_NOWAIT, MULOG); 2269 2270 if (connected && (sep->se_log & MULOG_RFC931)) 2271 syslog(LOG_INFO, "%s@%s wants %s", 2272 rfc931_name(sa, ctrl), host, sep->se_service); 2273 else 2274 syslog(LOG_INFO, "%s wants %s", 2275 host, sep->se_service); 2276 } 2277 2278 /* 2279 * From tcp_log by 2280 * Wietse Venema, Eindhoven University of Technology, The Netherlands. 2281 */ 2282 #if 0 2283 static char sccsid[] = "@(#) rfc931.c 1.3 92/08/31 22:54:46"; 2284 #endif 2285 2286 #include <setjmp.h> 2287 2288 #define RFC931_PORT 113 /* Semi-well-known port */ 2289 #define TIMEOUT 4 2290 #define TIMEOUT2 10 2291 2292 static jmp_buf timebuf; 2293 2294 /* timeout - handle timeouts */ 2295 2296 static void 2297 timeout(sig) 2298 int sig; 2299 { 2300 longjmp(timebuf, sig); 2301 } 2302 2303 /* rfc931_name - return remote user name */ 2304 2305 char * 2306 rfc931_name(there, ctrl) 2307 struct sockaddr *there; /* remote link information */ 2308 int ctrl; 2309 { 2310 struct sockaddr_storage here; /* local link information */ 2311 struct sockaddr_storage sin; /* for talking to RFC931 daemon */ 2312 socklen_t length; 2313 int s; 2314 unsigned remote; 2315 unsigned local; 2316 static char user[256]; /* XXX */ 2317 char buf[256]; 2318 char *cp; 2319 char *result = "USER_UNKNOWN"; 2320 int len; 2321 u_int16_t myport, hisport; 2322 2323 /* Find out local port number of our stdin. */ 2324 2325 length = sizeof(here); 2326 if (getsockname(ctrl, (struct sockaddr *) &here, &length) == -1) { 2327 syslog(LOG_ERR, "getsockname: %m"); 2328 return (result); 2329 } 2330 switch (here.ss_family) { 2331 case AF_INET: 2332 myport = ((struct sockaddr_in *)&here)->sin_port; 2333 break; 2334 #ifdef INET6 2335 case AF_INET6: 2336 myport = ((struct sockaddr_in6 *)&here)->sin6_port; 2337 break; 2338 #endif 2339 } 2340 switch (there->sa_family) { 2341 case AF_INET: 2342 hisport = ((struct sockaddr_in *)&there)->sin_port; 2343 break; 2344 #ifdef INET6 2345 case AF_INET6: 2346 hisport = ((struct sockaddr_in6 *)&there)->sin6_port; 2347 break; 2348 #endif 2349 } 2350 /* Set up timer so we won't get stuck. */ 2351 2352 if ((s = socket(here.ss_family, SOCK_STREAM, 0)) == -1) { 2353 syslog(LOG_ERR, "socket: %m"); 2354 return (result); 2355 } 2356 2357 sin = here; 2358 switch (sin.ss_family) { 2359 case AF_INET: 2360 ((struct sockaddr_in *)&sin)->sin_port = htons(0); 2361 break; 2362 #ifdef INET6 2363 case AF_INET6: 2364 ((struct sockaddr_in6 *)&sin)->sin6_port = htons(0); 2365 break; 2366 #endif 2367 } 2368 if (bind(s, (struct sockaddr *) &sin, sin.ss_len) == -1) { 2369 syslog(LOG_ERR, "bind: %m"); 2370 return (result); 2371 } 2372 2373 signal(SIGALRM, timeout); 2374 if (setjmp(timebuf)) { 2375 close(s); /* not: fclose(fp) */ 2376 return (result); 2377 } 2378 alarm(TIMEOUT); 2379 2380 /* Connect to the RFC931 daemon. */ 2381 2382 memcpy(&sin, there, there->sa_len); 2383 switch (sin.ss_family) { 2384 case AF_INET: 2385 ((struct sockaddr_in *)&sin)->sin_port = htons(RFC931_PORT); 2386 break; 2387 #ifdef INET6 2388 case AF_INET6: 2389 ((struct sockaddr_in6 *)&sin)->sin6_port = htons(RFC931_PORT); 2390 break; 2391 #endif 2392 } 2393 if (connect(s, (struct sockaddr *) &sin, sin.ss_len) == -1) { 2394 close(s); 2395 alarm(0); 2396 return (result); 2397 } 2398 2399 /* Query the RFC 931 server. Would 13-byte writes ever be broken up? */ 2400 (void)snprintf(buf, sizeof buf, "%u,%u\r\n", ntohs(hisport), 2401 ntohs(myport)); 2402 2403 for (len = 0, cp = buf; len < strlen(buf); ) { 2404 int n; 2405 2406 if ((n = write(s, cp, strlen(buf) - len)) == -1) { 2407 close(s); 2408 alarm(0); 2409 return (result); 2410 } 2411 cp += n; 2412 len += n; 2413 } 2414 2415 /* Read response */ 2416 for (cp = buf; cp < buf + sizeof(buf) - 1; ) { 2417 char c; 2418 if (read(s, &c, 1) != 1) { 2419 close(s); 2420 alarm(0); 2421 return (result); 2422 } 2423 if (c == '\n') 2424 break; 2425 *cp++ = c; 2426 } 2427 *cp = '\0'; 2428 2429 if (sscanf(buf, "%u , %u : USERID :%*[^:]:%255s", &remote, &local, 2430 user) == 3 && ntohs(hisport) == remote && ntohs(myport) == local) { 2431 /* Strip trailing carriage return. */ 2432 if ((cp = strchr(user, '\r')) != NULL) 2433 *cp = 0; 2434 result = user; 2435 } 2436 2437 alarm(0); 2438 close(s); 2439 return (result); 2440 } 2441 #endif 2442 2443 /* 2444 * check if the address/port where send data to is one of the obvious ports 2445 * that are used for denial of service attacks like two echo ports 2446 * just echoing data between them 2447 */ 2448 int 2449 port_good_dg(sa) 2450 struct sockaddr *sa; 2451 { 2452 struct in_addr in; 2453 #ifdef INET6 2454 struct in6_addr *in6; 2455 #endif 2456 u_int16_t port; 2457 int i, bad; 2458 char hbuf[NI_MAXHOST]; 2459 2460 bad = 0; 2461 2462 switch (sa->sa_family) { 2463 case AF_INET: 2464 in.s_addr = ntohl(((struct sockaddr_in *)sa)->sin_addr.s_addr); 2465 port = ntohs(((struct sockaddr_in *)sa)->sin_port); 2466 v4chk: 2467 if (IN_MULTICAST(in.s_addr)) 2468 goto bad; 2469 switch ((in.s_addr & 0xff000000) >> 24) { 2470 case 0: case 127: case 255: 2471 goto bad; 2472 } 2473 if (dg_broadcast(&in)) 2474 goto bad; 2475 break; 2476 #ifdef INET6 2477 case AF_INET6: 2478 in6 = &((struct sockaddr_in6 *)sa)->sin6_addr; 2479 port = ntohs(((struct sockaddr_in6 *)sa)->sin6_port); 2480 if (IN6_IS_ADDR_MULTICAST(in6) || IN6_IS_ADDR_UNSPECIFIED(in6)) 2481 goto bad; 2482 if (IN6_IS_ADDR_V4MAPPED(in6) || IN6_IS_ADDR_V4COMPAT(in6)) { 2483 memcpy(&in, &in6->s6_addr[12], sizeof(in)); 2484 in.s_addr = ntohl(in.s_addr); 2485 goto v4chk; 2486 } 2487 break; 2488 #endif 2489 default: 2490 /* XXX unsupported af, is it safe to assume it to be safe? */ 2491 return 1; 2492 } 2493 2494 for (i = 0; bad_ports[i] != 0; i++) { 2495 if (port == bad_ports[i]) 2496 goto bad; 2497 } 2498 2499 return (1); 2500 2501 bad: 2502 if (getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), NULL, 0, 2503 niflags) != 0) 2504 strcpy(hbuf, "?"); 2505 syslog(LOG_WARNING,"Possible DoS attack from %s, Port %d", 2506 hbuf, port); 2507 return (0); 2508 } 2509 2510 /* XXX need optimization */ 2511 int 2512 dg_broadcast(in) 2513 struct in_addr *in; 2514 { 2515 struct ifaddrs *ifa, *ifap; 2516 struct sockaddr_in *sin; 2517 2518 if (getifaddrs(&ifap) < 0) 2519 return (0); 2520 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 2521 if (ifa->ifa_addr->sa_family != AF_INET || 2522 (ifa->ifa_flags & IFF_BROADCAST) == 0) 2523 continue; 2524 sin = (struct sockaddr_in *)ifa->ifa_broadaddr; 2525 if (sin->sin_addr.s_addr == in->s_addr) { 2526 freeifaddrs(ifap); 2527 return (1); 2528 } 2529 } 2530 freeifaddrs(ifap); 2531 return (0); 2532 } 2533
Indexes created Fri Sep 26 08:10:20 GMT 2025