inetd.c revision 1.64
1 /* $NetBSD: inetd.c,v 1.64 2000/07/03 23:40:59 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 1.64 2000/07/03 23:40:59 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 <netinet/in.h> 215 #include <arpa/inet.h> 216 #ifdef RPC 217 #include <rpc/rpc.h> 218 #include <rpc/rpcb_clnt.h> 219 #include <netconfig.h> 220 #endif 221 222 #include <ctype.h> 223 #include <errno.h> 224 #include <fcntl.h> 225 #include <grp.h> 226 #include <netdb.h> 227 #include <pwd.h> 228 #include <signal.h> 229 #include <stdio.h> 230 #include <stdlib.h> 231 #include <string.h> 232 #include <syslog.h> 233 #include <unistd.h> 234 #include <util.h> 235 236 #include "pathnames.h" 237 238 #ifdef IPSEC 239 #include <netinet6/ipsec.h> 240 #ifndef IPSEC_POLICY_IPSEC /* no ipsec support on old ipsec */ 241 #undef IPSEC 242 #endif 243 #include "ipsec.h" 244 #endif 245 246 #ifdef LIBWRAP 247 # include <tcpd.h> 248 #ifndef LIBWRAP_ALLOW_FACILITY 249 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH 250 #endif 251 #ifndef LIBWRAP_ALLOW_SEVERITY 252 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO 253 #endif 254 #ifndef LIBWRAP_DENY_FACILITY 255 # define LIBWRAP_DENY_FACILITY LOG_AUTH 256 #endif 257 #ifndef LIBWRAP_DENY_SEVERITY 258 # define LIBWRAP_DENY_SEVERITY LOG_WARNING 259 #endif 260 int allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY; 261 int deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY; 262 #endif 263 264 #define TOOMANY 40 /* don't start more than TOOMANY */ 265 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */ 266 #define RETRYTIME (60*10) /* retry after bind or server fail */ 267 268 #define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM)) 269 270 int debug; 271 #ifdef LIBWRAP 272 int lflag; 273 #endif 274 int nsock, maxsock; 275 fd_set allsock; 276 int options; 277 int timingout; 278 struct servent *sp; 279 char *curdom; 280 #ifdef NI_WITHSCOPEID 281 const int niflags = NI_NUMERICHOST | NI_NUMERICSERV | NI_WITHSCOPEID; 282 #else 283 const int niflags = NI_NUMERICHOST | NI_NUMERICSERV; 284 #endif 285 286 #ifndef OPEN_MAX 287 #define OPEN_MAX 64 288 #endif 289 290 /* Reserve some descriptors, 3 stdio + at least: 1 log, 1 conf. file */ 291 #define FD_MARGIN (8) 292 typeof(((struct rlimit *)0)->rlim_cur) rlim_ofile_cur = OPEN_MAX; 293 294 #ifdef RLIMIT_NOFILE 295 struct rlimit rlim_ofile; 296 #endif 297 298 struct servtab { 299 char *se_hostaddr; /* host address to listen on */ 300 char *se_service; /* name of service */ 301 int se_socktype; /* type of socket to use */ 302 int se_family; /* address family */ 303 char *se_proto; /* protocol used */ 304 int se_sndbuf; /* sndbuf size */ 305 int se_rcvbuf; /* rcvbuf size */ 306 int se_rpcprog; /* rpc program number */ 307 int se_rpcversl; /* rpc program lowest version */ 308 int se_rpcversh; /* rpc program highest version */ 309 #define isrpcservice(sep) ((sep)->se_rpcversl != 0) 310 pid_t se_wait; /* single threaded server */ 311 short se_checked; /* looked at during merge */ 312 char *se_user; /* user name to run as */ 313 char *se_group; /* group name to run as */ 314 struct biltin *se_bi; /* if built-in, description */ 315 char *se_server; /* server program */ 316 #define MAXARGV 20 317 char *se_argv[MAXARGV+1]; /* program arguments */ 318 #ifdef IPSEC 319 char *se_policy; /* IPsec poilcy string */ 320 #endif 321 int se_fd; /* open descriptor */ 322 int se_type; /* type */ 323 union { 324 struct sockaddr se_un_ctrladdr; 325 struct sockaddr_in se_un_ctrladdr_in; 326 struct sockaddr_in6 se_un_ctrladdr_in6; 327 struct sockaddr_un se_un_ctrladdr_un; 328 } se_un; /* bound address */ 329 #define se_ctrladdr se_un.se_un_ctrladdr 330 #define se_ctrladdr_in se_un.se_un_ctrladdr_in 331 #define se_ctrladdr_un se_un.se_un_ctrladdr_un 332 int se_ctrladdr_size; 333 int se_max; /* max # of instances of this service */ 334 int se_count; /* number started since se_time */ 335 struct timeval se_time; /* start of se_count */ 336 #ifdef MULOG 337 int se_log; 338 #define MULOG_RFC931 0x40000000 339 #endif 340 struct servtab *se_next; 341 } *servtab; 342 343 #define NORM_TYPE 0 344 #define MUX_TYPE 1 345 #define MUXPLUS_TYPE 2 346 #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 *sep)); 381 void unregister_rpc __P((struct servtab *sep)); 382 void bump_nofile __P((void)); 383 void inetd_setproctitle __P((char *, int)); 384 void initring __P((void)); 385 long machtime __P((void)); 386 int port_good_dg __P((struct sockaddr *sa)); 387 static int getline __P((int, char *, int)); 388 int main __P((int, char *[], char *[])); 389 390 struct biltin { 391 char *bi_service; /* internally provided service name */ 392 int bi_socktype; /* type of socket supported */ 393 short bi_fork; /* 1 if should fork before call */ 394 short bi_wait; /* 1 if should wait for child */ 395 void (*bi_fn) __P((int, struct servtab *)); 396 /* function which performs it */ 397 } biltins[] = { 398 /* Echo received data */ 399 { "echo", SOCK_STREAM, 1, 0, echo_stream }, 400 { "echo", SOCK_DGRAM, 0, 0, echo_dg }, 401 402 /* Internet /dev/null */ 403 { "discard", SOCK_STREAM, 1, 0, discard_stream }, 404 { "discard", SOCK_DGRAM, 0, 0, discard_dg }, 405 406 /* Return 32 bit time since 1970 */ 407 { "time", SOCK_STREAM, 0, 0, machtime_stream }, 408 { "time", SOCK_DGRAM, 0, 0, machtime_dg }, 409 410 /* Return human-readable time */ 411 { "daytime", SOCK_STREAM, 0, 0, daytime_stream }, 412 { "daytime", SOCK_DGRAM, 0, 0, daytime_dg }, 413 414 /* Familiar character generator */ 415 { "chargen", SOCK_STREAM, 1, 0, chargen_stream }, 416 { "chargen", SOCK_DGRAM, 0, 0, chargen_dg }, 417 418 { "tcpmux", SOCK_STREAM, 1, 0, tcpmux }, 419 420 { NULL } 421 }; 422 423 /* list of "bad" ports. I.e. ports that are most obviously used for 424 * "cycling packets" denial of service attacks. See /etc/services. 425 * List must end with port number "0". 426 */ 427 428 u_int16_t bad_ports[] = { 7, 9, 13, 19, 37, 0}; 429 430 431 #define NUMINT (sizeof(intab) / sizeof(struct inent)) 432 char *CONFIG = _PATH_INETDCONF; 433 char **Argv; 434 char *LastArg; 435 extern char *__progname; 436 437 int 438 main(argc, argv, envp) 439 int argc; 440 char *argv[], *envp[]; 441 { 442 struct servtab *sep, *nsep; 443 struct sigvec sv; 444 int ch, dofork; 445 pid_t pid; 446 447 Argv = argv; 448 if (envp == 0 || *envp == 0) 449 envp = argv; 450 while (*envp) 451 envp++; 452 LastArg = envp[-1] + strlen(envp[-1]); 453 454 while ((ch = getopt(argc, argv, 455 #ifdef LIBWRAP 456 "dl" 457 #else 458 "d" 459 #endif 460 )) != -1) 461 switch(ch) { 462 case 'd': 463 debug = 1; 464 options |= SO_DEBUG; 465 break; 466 #ifdef LIBWRAP 467 case 'l': 468 lflag = 1; 469 break; 470 #endif 471 case '?': 472 default: 473 usage(); 474 } 475 argc -= optind; 476 argv += optind; 477 478 if (argc > 0) 479 CONFIG = argv[0]; 480 481 if (debug == 0) 482 daemon(0, 0); 483 openlog(__progname, LOG_PID | LOG_NOWAIT, LOG_DAEMON); 484 pidfile(NULL); 485 486 #ifdef RLIMIT_NOFILE 487 if (getrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) { 488 syslog(LOG_ERR, "getrlimit: %m"); 489 } else { 490 rlim_ofile_cur = rlim_ofile.rlim_cur; 491 if (rlim_ofile_cur == RLIM_INFINITY) /* ! */ 492 rlim_ofile_cur = OPEN_MAX; 493 } 494 #endif 495 496 memset(&sv, 0, sizeof(sv)); 497 sv.sv_mask = SIGBLOCK; 498 sv.sv_handler = retry; 499 sigvec(SIGALRM, &sv, (struct sigvec *)0); 500 config(SIGHUP); 501 sv.sv_handler = config; 502 sigvec(SIGHUP, &sv, (struct sigvec *)0); 503 sv.sv_handler = reapchild; 504 sigvec(SIGCHLD, &sv, (struct sigvec *)0); 505 sv.sv_handler = goaway; 506 sigvec(SIGTERM, &sv, (struct sigvec *)0); 507 sv.sv_handler = goaway; 508 sigvec(SIGINT, &sv, (struct sigvec *)0); 509 sv.sv_mask = 0L; 510 sv.sv_handler = SIG_IGN; 511 sigvec(SIGPIPE, &sv, (struct sigvec *)0); 512 513 { 514 /* space for daemons to overwrite environment for ps */ 515 #define DUMMYSIZE 100 516 char dummy[DUMMYSIZE]; 517 518 (void)memset(dummy, 'x', DUMMYSIZE - 1); 519 dummy[DUMMYSIZE - 1] = '\0'; 520 521 (void)setenv("inetd_dummy", dummy, 1); 522 } 523 524 for (;;) { 525 int n, ctrl; 526 fd_set readable; 527 528 if (nsock == 0) { 529 (void) sigblock(SIGBLOCK); 530 while (nsock == 0) 531 sigpause(0L); 532 (void) sigsetmask(0L); 533 } 534 readable = allsock; 535 if ((n = select(maxsock + 1, &readable, (fd_set *)0, 536 (fd_set *)0, (struct timeval *)0)) <= 0) { 537 if (n == -1 && errno != EINTR) { 538 syslog(LOG_WARNING, "select: %m"); 539 sleep(1); 540 } 541 continue; 542 } 543 for (sep = servtab; n && sep; sep = nsep) { 544 nsep = sep->se_next; 545 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) { 546 n--; 547 if (debug) 548 fprintf(stderr, "someone wants %s\n", sep->se_service); 549 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 550 /* XXX here do the libwrap check-before-accept */ 551 ctrl = accept(sep->se_fd, (struct sockaddr *)0, 552 (int *)0); 553 if (debug) 554 fprintf(stderr, "accept, ctrl %d\n", ctrl); 555 if (ctrl < 0) { 556 if (errno != EINTR) 557 syslog(LOG_WARNING, 558 "accept (for %s): %m", 559 sep->se_service); 560 continue; 561 } 562 } else 563 ctrl = sep->se_fd; 564 (void) sigblock(SIGBLOCK); 565 pid = 0; 566 #ifdef LIBWRAP_INTERNAL 567 dofork = 1; 568 #else 569 dofork = (sep->se_bi == 0 || sep->se_bi->bi_fork); 570 #endif 571 if (dofork) { 572 if (sep->se_count++ == 0) 573 (void)gettimeofday(&sep->se_time, 574 (struct timezone *)0); 575 else if (sep->se_count >= sep->se_max) { 576 struct timeval now; 577 578 (void)gettimeofday(&now, (struct timezone *)0); 579 if (now.tv_sec - sep->se_time.tv_sec > 580 CNT_INTVL) { 581 sep->se_time = now; 582 sep->se_count = 1; 583 } else { 584 syslog(LOG_ERR, 585 "%s/%s server failing (looping), service terminated\n", 586 sep->se_service, sep->se_proto); 587 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 588 close(ctrl); 589 close_sep(sep); 590 sigsetmask(0L); 591 if (!timingout) { 592 timingout = 1; 593 alarm(RETRYTIME); 594 } 595 continue; 596 } 597 } 598 pid = fork(); 599 if (pid < 0) { 600 syslog(LOG_ERR, "fork: %m"); 601 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 602 close(ctrl); 603 sigsetmask(0L); 604 sleep(1); 605 continue; 606 } 607 if (pid != 0 && sep->se_wait) { 608 sep->se_wait = pid; 609 FD_CLR(sep->se_fd, &allsock); 610 nsock--; 611 } 612 if (pid == 0) { 613 sv.sv_mask = 0L; 614 sv.sv_handler = SIG_DFL; 615 sigvec(SIGPIPE, &sv, (struct sigvec *)0); 616 if (debug) 617 setsid(); 618 } 619 } 620 sigsetmask(0L); 621 if (pid == 0) { 622 run_service(ctrl, sep); 623 if (dofork) 624 exit(0); 625 } 626 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 627 close(ctrl); 628 } 629 } 630 } 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; 872 873 memset(&hints, 0, sizeof(hints)); 874 hints.ai_family = sep->se_family; 875 hints.ai_socktype = sep->se_socktype; 876 if (!strcmp(sep->se_hostaddr, "*")) { 877 hints.ai_flags = AI_PASSIVE; 878 host = NULL; 879 } else 880 host = sep->se_hostaddr; 881 if (isrpcservice(sep) || ISMUX(sep)) 882 port = "0"; 883 else 884 port = sep->se_service; 885 error = getaddrinfo(host, port, &hints, &res); 886 if (error) { 887 if (host == NULL) { 888 syslog(LOG_WARNING, "%s/%s: %s: " 889 "the address family is not " 890 "supported by the kernel", 891 sep->se_service, sep->se_proto, 892 sep->se_hostaddr); 893 } else { 894 syslog(LOG_ERR, "%s/%s: %s: %s", 895 sep->se_service, sep->se_proto, 896 sep->se_hostaddr, 897 gai_strerror(error)); 898 } 899 sep->se_checked = 0; 900 continue; 901 } 902 if (res->ai_next) { 903 syslog(LOG_ERR, 904 "%s/%s: %s: resolved to multiple addr", 905 sep->se_service, sep->se_proto, 906 sep->se_hostaddr); 907 sep->se_checked = 0; 908 freeaddrinfo(res); 909 continue; 910 } 911 memcpy(&sep->se_ctrladdr, res->ai_addr, 912 res->ai_addrlen); 913 if (ISMUX(sep)) { 914 sep->se_fd = -1; 915 freeaddrinfo(res); 916 continue; 917 } 918 sep->se_ctrladdr_size = res->ai_addrlen; 919 freeaddrinfo(res); 920 #ifdef RPC 921 if (isrpcservice(sep)) { 922 struct rpcent *rp; 923 924 sep->se_rpcprog = atoi(sep->se_service); 925 if (sep->se_rpcprog == 0) { 926 rp = getrpcbyname(sep->se_service); 927 if (rp == 0) { 928 syslog(LOG_ERR, 929 "%s/%s: unknown service", 930 sep->se_service, 931 sep->se_proto); 932 sep->se_checked = 0; 933 continue; 934 } 935 sep->se_rpcprog = rp->r_number; 936 } 937 if (sep->se_fd == -1 && !ISMUX(sep)) 938 setup(sep); 939 if (sep->se_fd != -1) 940 register_rpc(sep); 941 } else 942 #endif 943 { 944 if (sep->se_fd >= 0) 945 close_sep(sep); 946 if (sep->se_fd == -1 && !ISMUX(sep)) 947 setup(sep); 948 } 949 } 950 } 951 } 952 endconfig(); 953 /* 954 * Purge anything not looked at above. 955 */ 956 omask = sigblock(SIGBLOCK); 957 sepp = &servtab; 958 while ((sep = *sepp)) { 959 if (sep->se_checked) { 960 sepp = &sep->se_next; 961 continue; 962 } 963 *sepp = sep->se_next; 964 if (sep->se_fd >= 0) 965 close_sep(sep); 966 if (isrpcservice(sep)) 967 unregister_rpc(sep); 968 if (sep->se_family == AF_LOCAL) 969 (void)unlink(sep->se_service); 970 if (debug) 971 print_service("FREE", sep); 972 freeconfig(sep); 973 free((char *)sep); 974 } 975 (void) sigsetmask(omask); 976 } 977 978 void 979 retry(signo) 980 int signo; 981 { 982 struct servtab *sep; 983 984 timingout = 0; 985 for (sep = servtab; sep; sep = sep->se_next) { 986 if (sep->se_fd == -1 && !ISMUX(sep)) { 987 switch (sep->se_family) { 988 case AF_LOCAL: 989 case AF_INET: 990 #ifdef INET6 991 case AF_INET6: 992 #endif 993 setup(sep); 994 if (sep->se_fd != -1 && isrpcservice(sep)) 995 register_rpc(sep); 996 break; 997 } 998 } 999 } 1000 } 1001 1002 void 1003 goaway(signo) 1004 int signo; 1005 { 1006 struct servtab *sep; 1007 1008 for (sep = servtab; sep; sep = sep->se_next) { 1009 if (sep->se_fd == -1) 1010 continue; 1011 1012 switch (sep->se_family) { 1013 case AF_LOCAL: 1014 (void)unlink(sep->se_service); 1015 break; 1016 case AF_INET: 1017 #ifdef INET6 1018 case AF_INET6: 1019 #endif 1020 if (sep->se_wait == 1 && isrpcservice(sep)) 1021 unregister_rpc(sep); 1022 break; 1023 } 1024 (void)close(sep->se_fd); 1025 } 1026 exit(0); 1027 } 1028 1029 void 1030 setup(sep) 1031 struct servtab *sep; 1032 { 1033 int on = 1; 1034 1035 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) { 1036 if (debug) 1037 fprintf(stderr, "socket failed on %s/%s: %s\n", 1038 sep->se_service, sep->se_proto, strerror(errno)); 1039 syslog(LOG_ERR, "%s/%s: socket: %m", 1040 sep->se_service, sep->se_proto); 1041 return; 1042 } 1043 /* Set all listening sockets to close-on-exec. */ 1044 if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) 1045 syslog(LOG_ERR, "fcntl (F_SETFD, FD_CLOEXEC): %m"); 1046 1047 #define turnon(fd, opt) \ 1048 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 1049 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 1050 turnon(sep->se_fd, SO_DEBUG) < 0) 1051 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 1052 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 1053 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 1054 #undef turnon 1055 1056 /* Set the socket buffer sizes, if specified. */ 1057 if (sep->se_sndbuf != 0 && setsockopt(sep->se_fd, SOL_SOCKET, 1058 SO_SNDBUF, (char *)&sep->se_sndbuf, sizeof(sep->se_sndbuf)) < 0) 1059 syslog(LOG_ERR, "setsockopt (SO_SNDBUF %d): %m", 1060 sep->se_sndbuf); 1061 if (sep->se_rcvbuf != 0 && setsockopt(sep->se_fd, SOL_SOCKET, 1062 SO_RCVBUF, (char *)&sep->se_rcvbuf, sizeof(sep->se_rcvbuf)) < 0) 1063 syslog(LOG_ERR, "setsockopt (SO_RCVBUF %d): %m", 1064 sep->se_rcvbuf); 1065 #ifdef IPSEC 1066 if (ipsecsetup(sep->se_family, sep->se_fd, sep->se_policy) < 0 1067 && sep->se_policy) { 1068 syslog(LOG_ERR, "%s/%s: ipsec setup failed", 1069 sep->se_service, sep->se_proto); 1070 (void)close(sep->se_fd); 1071 sep->se_fd = -1; 1072 return; 1073 } 1074 #endif 1075 1076 if (bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size) < 0) { 1077 if (debug) 1078 fprintf(stderr, "bind failed on %s/%s: %s\n", 1079 sep->se_service, sep->se_proto, strerror(errno)); 1080 syslog(LOG_ERR, "%s/%s: bind: %m", 1081 sep->se_service, sep->se_proto); 1082 (void) close(sep->se_fd); 1083 sep->se_fd = -1; 1084 if (!timingout) { 1085 timingout = 1; 1086 alarm(RETRYTIME); 1087 } 1088 return; 1089 } 1090 if (sep->se_socktype == SOCK_STREAM) 1091 listen(sep->se_fd, 10); 1092 1093 FD_SET(sep->se_fd, &allsock); 1094 nsock++; 1095 if (sep->se_fd > maxsock) { 1096 maxsock = sep->se_fd; 1097 if (maxsock > rlim_ofile_cur - FD_MARGIN) 1098 bump_nofile(); 1099 } 1100 if (debug) 1101 fprintf(stderr, "registered %s on %d\n", 1102 sep->se_server, sep->se_fd); 1103 } 1104 1105 /* 1106 * Finish with a service and its socket. 1107 */ 1108 void 1109 close_sep(sep) 1110 struct servtab *sep; 1111 { 1112 if (sep->se_fd >= 0) { 1113 nsock--; 1114 FD_CLR(sep->se_fd, &allsock); 1115 (void) close(sep->se_fd); 1116 sep->se_fd = -1; 1117 } 1118 sep->se_count = 0; 1119 /* 1120 * Don't keep the pid of this running deamon: when reapchild() 1121 * reaps this pid, it would erroneously increment nsock. 1122 */ 1123 if (sep->se_wait > 1) 1124 sep->se_wait = 1; 1125 } 1126 1127 void 1128 register_rpc(sep) 1129 struct servtab *sep; 1130 { 1131 #ifdef RPC 1132 int n; 1133 struct netbuf nbuf; 1134 struct sockaddr_storage ss; 1135 struct netconfig *nconf; 1136 1137 if ((nconf = getnetconfigent(sep->se_proto+4)) == NULL) { 1138 syslog(LOG_ERR, "%s: getnetconfigent failed", 1139 sep->se_proto); 1140 return; 1141 } 1142 n = sizeof ss; 1143 if (getsockname(sep->se_fd, (struct sockaddr *)&ss, &n) < 0) { 1144 syslog(LOG_ERR, "%s/%s: getsockname: %m", 1145 sep->se_service, sep->se_proto); 1146 return; 1147 } 1148 1149 nbuf.buf = &ss; 1150 nbuf.len = ss.ss_len; 1151 nbuf.maxlen = sizeof (struct sockaddr_storage); 1152 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1153 if (debug) 1154 fprintf(stderr, "rpcb_set: %u %d %s %s\n", 1155 sep->se_rpcprog, n, nconf->nc_netid, 1156 taddr2uaddr(nconf, &nbuf)); 1157 (void)rpcb_unset(sep->se_rpcprog, n, nconf); 1158 if (!rpcb_set(sep->se_rpcprog, n, nconf, &nbuf)) 1159 syslog(LOG_ERR, "rpcb_set: %u %d %s %s%s", 1160 sep->se_rpcprog, n, nconf->nc_netid, 1161 taddr2uaddr(nconf, &nbuf), clnt_spcreateerror("")); 1162 } 1163 #endif /* RPC */ 1164 } 1165 1166 void 1167 unregister_rpc(sep) 1168 struct servtab *sep; 1169 { 1170 #ifdef RPC 1171 int n; 1172 struct netconfig *nconf; 1173 1174 if ((nconf = getnetconfigent(sep->se_proto+4)) == NULL) { 1175 syslog(LOG_ERR, "%s: getnetconfigent failed", 1176 sep->se_proto); 1177 return; 1178 } 1179 1180 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1181 if (debug) 1182 fprintf(stderr, "rpcb_unset(%u, %d, %s)\n", 1183 sep->se_rpcprog, n, nconf->nc_netid); 1184 if (!rpcb_unset(sep->se_rpcprog, n, nconf)) 1185 syslog(LOG_ERR, "rpcb_unset(%u, %d, %s) failed\n", 1186 sep->se_rpcprog, n, nconf->nc_netid); 1187 } 1188 #endif /* RPC */ 1189 } 1190 1191 1192 struct servtab * 1193 enter(cp) 1194 struct servtab *cp; 1195 { 1196 struct servtab *sep; 1197 long omask; 1198 1199 sep = (struct servtab *)malloc(sizeof (*sep)); 1200 if (sep == (struct servtab *)0) { 1201 syslog(LOG_ERR, "Out of memory."); 1202 exit(-1); 1203 } 1204 *sep = *cp; 1205 sep->se_fd = -1; 1206 sep->se_rpcprog = -1; 1207 omask = sigblock(SIGBLOCK); 1208 sep->se_next = servtab; 1209 servtab = sep; 1210 sigsetmask(omask); 1211 return (sep); 1212 } 1213 1214 FILE *fconfig = NULL; 1215 struct servtab serv; 1216 char line[LINE_MAX]; 1217 char *defhost; 1218 #ifdef IPSEC 1219 static char *policy = NULL; 1220 #endif 1221 1222 int 1223 setconfig() 1224 { 1225 if (defhost) 1226 free(defhost); 1227 defhost = newstr("*"); 1228 #ifdef IPSEC 1229 if (policy) 1230 free(policy); 1231 policy = NULL; 1232 #endif 1233 if (fconfig != NULL) { 1234 fseek(fconfig, 0L, SEEK_SET); 1235 return (1); 1236 } 1237 fconfig = fopen(CONFIG, "r"); 1238 return (fconfig != NULL); 1239 } 1240 1241 void 1242 endconfig() 1243 { 1244 if (fconfig) { 1245 (void) fclose(fconfig); 1246 fconfig = NULL; 1247 } 1248 if (defhost) { 1249 free(defhost); 1250 defhost = 0; 1251 } 1252 } 1253 1254 struct servtab * 1255 getconfigent() 1256 { 1257 struct servtab *sep = &serv; 1258 int argc, val; 1259 char *cp, *cp0, *arg, *buf0, *buf1, *sz0, *sz1; 1260 static char TCPMUX_TOKEN[] = "tcpmux/"; 1261 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) 1262 char *hostdelim; 1263 1264 more: 1265 while ((cp = nextline(fconfig))) { 1266 #ifdef IPSEC 1267 /* lines starting with #@ is not a comment, but the policy */ 1268 if (cp[0] == '#' && cp[1] == '@') { 1269 char *p; 1270 for (p = cp + 2; p && *p && isspace(*p); p++) 1271 ; 1272 if (*p == '\0') { 1273 if (policy) 1274 free(policy); 1275 policy = NULL; 1276 } else { 1277 if (ipsecsetup_test(p) < 0) { 1278 syslog(LOG_ERR, 1279 "%s: invalid ipsec policy \"%s\"", 1280 CONFIG, p); 1281 exit(-1); 1282 } else { 1283 if (policy) 1284 free(policy); 1285 policy = newstr(p); 1286 } 1287 } 1288 } 1289 #endif 1290 if (*cp == '#' || *cp == '\0') 1291 continue; 1292 #ifdef MULOG 1293 /* Avoid use of `skip' if there is a danger of it looking 1294 * at continuation lines. 1295 */ 1296 do { 1297 cp++; 1298 } while (*cp == ' ' || *cp == '\t'); 1299 if (*cp == '\0') 1300 continue; 1301 if ((arg = skip(&cp)) == NULL) 1302 continue; 1303 if (strcmp(arg, "DOMAIN")) 1304 continue; 1305 if (curdom) 1306 free(curdom); 1307 curdom = NULL; 1308 while (*cp == ' ' || *cp == '\t') 1309 cp++; 1310 if (*cp == '\0') 1311 continue; 1312 arg = cp; 1313 while (*cp && *cp != ' ' && *cp != '\t') 1314 cp++; 1315 if (*cp != '\0') 1316 *cp++ = '\0'; 1317 curdom = newstr(arg); 1318 #endif 1319 break; 1320 } 1321 if (cp == NULL) 1322 return ((struct servtab *)0); 1323 /* 1324 * clear the static buffer, since some fields (se_ctrladdr, 1325 * for example) don't get initialized here. 1326 */ 1327 memset((caddr_t)sep, 0, sizeof *sep); 1328 arg = skip(&cp); 1329 if (cp == NULL) { 1330 /* got an empty line containing just blanks/tabs. */ 1331 goto more; 1332 } 1333 /* Check for a host name. */ 1334 hostdelim = strrchr(arg, ':'); 1335 if (hostdelim) { 1336 *hostdelim = '\0'; 1337 sep->se_hostaddr = newstr(arg); 1338 arg = hostdelim + 1; 1339 /* 1340 * If the line is of the form `host:', then just change the 1341 * default host for the following lines. 1342 */ 1343 if (*arg == '\0') { 1344 arg = skip(&cp); 1345 if (cp == NULL) { 1346 free(defhost); 1347 defhost = sep->se_hostaddr; 1348 goto more; 1349 } 1350 } 1351 } else 1352 sep->se_hostaddr = newstr(defhost); 1353 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1354 char *c = arg + MUX_LEN; 1355 if (*c == '+') { 1356 sep->se_type = MUXPLUS_TYPE; 1357 c++; 1358 } else 1359 sep->se_type = MUX_TYPE; 1360 sep->se_service = newstr(c); 1361 } else { 1362 sep->se_service = newstr(arg); 1363 sep->se_type = NORM_TYPE; 1364 } 1365 1366 arg = sskip(&cp); 1367 if (strcmp(arg, "stream") == 0) 1368 sep->se_socktype = SOCK_STREAM; 1369 else if (strcmp(arg, "dgram") == 0) 1370 sep->se_socktype = SOCK_DGRAM; 1371 else if (strcmp(arg, "rdm") == 0) 1372 sep->se_socktype = SOCK_RDM; 1373 else if (strcmp(arg, "seqpacket") == 0) 1374 sep->se_socktype = SOCK_SEQPACKET; 1375 else if (strcmp(arg, "raw") == 0) 1376 sep->se_socktype = SOCK_RAW; 1377 else 1378 sep->se_socktype = -1; 1379 1380 sep->se_proto = newstr(sskip(&cp)); 1381 1382 #define MALFORMED(arg) \ 1383 do { \ 1384 syslog(LOG_ERR, "%s: malformed buffer size option `%s'", \ 1385 sep->se_service, (arg)); \ 1386 goto more; \ 1387 } while (0) 1388 1389 #define GETVAL(arg) \ 1390 do { \ 1391 if (!isdigit(*(arg))) \ 1392 MALFORMED(arg); \ 1393 val = strtol((arg), &cp0, 10); \ 1394 if (cp0 != NULL) { \ 1395 if (cp0[1] != '\0') \ 1396 MALFORMED((arg)); \ 1397 if (cp0[0] == 'k') \ 1398 val *= 1024; \ 1399 if (cp0[0] == 'm') \ 1400 val *= 1024 * 1024; \ 1401 } \ 1402 if (val < 1) { \ 1403 syslog(LOG_ERR, "%s: invalid buffer size `%s'", \ 1404 sep->se_service, (arg)); \ 1405 goto more; \ 1406 } \ 1407 } while (0) 1408 1409 #define ASSIGN(arg) \ 1410 do { \ 1411 if (strcmp((arg), "sndbuf") == 0) \ 1412 sep->se_sndbuf = val; \ 1413 else if (strcmp((arg), "rcvbuf") == 0) \ 1414 sep->se_rcvbuf = val; \ 1415 else \ 1416 MALFORMED((arg)); \ 1417 } while (0) 1418 1419 /* 1420 * Extract the send and receive buffer sizes before parsing 1421 * the protocol. 1422 */ 1423 sep->se_sndbuf = sep->se_rcvbuf = 0; 1424 buf0 = buf1 = sz0 = sz1 = NULL; 1425 if ((buf0 = strchr(sep->se_proto, ',')) != NULL) { 1426 /* Not meaningful for Tcpmux services. */ 1427 if (ISMUX(sep)) { 1428 syslog(LOG_ERR, "%s: can't specify buffer sizes for " 1429 "tcpmux services", sep->se_service); 1430 goto more; 1431 } 1432 1433 /* Skip the , */ 1434 *buf0++ = '\0'; 1435 1436 /* Check to see if another socket buffer size was specified. */ 1437 if ((buf1 = strchr(buf0, ',')) != NULL) { 1438 /* Skip the , */ 1439 *buf1++ = '\0'; 1440 1441 /* Make sure a 3rd one wasn't specified. */ 1442 if (strchr(buf1, ',') != NULL) { 1443 syslog(LOG_ERR, "%s: too many buffer sizes", 1444 sep->se_service); 1445 goto more; 1446 } 1447 1448 /* Locate the size. */ 1449 if ((sz1 = strchr(buf1, '=')) == NULL) 1450 MALFORMED(buf1); 1451 1452 /* Skip the = */ 1453 *sz1++ = '\0'; 1454 } 1455 1456 /* Locate the size. */ 1457 if ((sz0 = strchr(buf0, '=')) == NULL) 1458 MALFORMED(buf0); 1459 1460 /* Skip the = */ 1461 *sz0++ = '\0'; 1462 1463 GETVAL(sz0); 1464 ASSIGN(buf0); 1465 1466 if (buf1 != NULL) { 1467 GETVAL(sz1); 1468 ASSIGN(buf1); 1469 } 1470 } 1471 1472 #undef ASSIGN 1473 #undef GETVAL 1474 #undef MALFORMED 1475 1476 if (strcmp(sep->se_proto, "unix") == 0) { 1477 sep->se_family = AF_LOCAL; 1478 } else { 1479 val = strlen(sep->se_proto); 1480 if (!val) { 1481 syslog(LOG_ERR, "%s: invalid protocol specified", 1482 sep->se_service); 1483 goto more; 1484 } 1485 val = sep->se_proto[val - 1]; 1486 switch (val) { 1487 case '4': /*tcp4 or udp4*/ 1488 sep->se_family = AF_INET; 1489 break; 1490 #ifdef INET6 1491 case '6': /*tcp6 or udp6*/ 1492 sep->se_family = AF_INET6; 1493 break; 1494 #endif 1495 default: 1496 sep->se_family = AF_INET; /*will become AF_INET6*/ 1497 break; 1498 } 1499 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1500 #ifdef RPC 1501 char *cp, *ccp; 1502 cp = strchr(sep->se_service, '/'); 1503 if (cp == 0) { 1504 syslog(LOG_ERR, "%s: no rpc version", 1505 sep->se_service); 1506 goto more; 1507 } 1508 *cp++ = '\0'; 1509 sep->se_rpcversl = sep->se_rpcversh = 1510 strtol(cp, &ccp, 0); 1511 if (ccp == cp) { 1512 badafterall: 1513 syslog(LOG_ERR, "%s/%s: bad rpc version", 1514 sep->se_service, cp); 1515 goto more; 1516 } 1517 if (*ccp == '-') { 1518 cp = ccp + 1; 1519 sep->se_rpcversh = strtol(cp, &ccp, 0); 1520 if (ccp == cp) 1521 goto badafterall; 1522 } 1523 #else 1524 syslog(LOG_ERR, "%s: rpc services not suported", 1525 sep->se_service); 1526 goto more; 1527 #endif /* RPC */ 1528 } 1529 } 1530 arg = sskip(&cp); 1531 { 1532 char *cp; 1533 if ((cp = strchr(arg, ':')) == NULL) 1534 cp = strchr(arg, '.'); 1535 if (cp != NULL) { 1536 *cp++ = '\0'; 1537 sep->se_max = atoi(cp); 1538 } else 1539 sep->se_max = TOOMANY; 1540 } 1541 sep->se_wait = strcmp(arg, "wait") == 0; 1542 if (ISMUX(sep)) { 1543 /* 1544 * Silently enforce "nowait" for TCPMUX services since 1545 * they don't have an assigned port to listen on. 1546 */ 1547 sep->se_wait = 0; 1548 1549 if (strncmp(sep->se_proto, "tcp", 3)) { 1550 syslog(LOG_ERR, 1551 "%s: bad protocol for tcpmux service %s", 1552 CONFIG, sep->se_service); 1553 goto more; 1554 } 1555 if (sep->se_socktype != SOCK_STREAM) { 1556 syslog(LOG_ERR, 1557 "%s: bad socket type for tcpmux service %s", 1558 CONFIG, sep->se_service); 1559 goto more; 1560 } 1561 } 1562 sep->se_user = newstr(sskip(&cp)); 1563 if ((sep->se_group = strchr(sep->se_user, ':')) != NULL) 1564 *sep->se_group++ = '\0'; 1565 else if ((sep->se_group = strchr(sep->se_user, '.')) != NULL) 1566 *sep->se_group++ = '\0'; 1567 1568 sep->se_server = newstr(sskip(&cp)); 1569 if (strcmp(sep->se_server, "internal") == 0) { 1570 struct biltin *bi; 1571 1572 for (bi = biltins; bi->bi_service; bi++) 1573 if (bi->bi_socktype == sep->se_socktype && 1574 strcmp(bi->bi_service, sep->se_service) == 0) 1575 break; 1576 if (bi->bi_service == 0) { 1577 syslog(LOG_ERR, "internal service %s unknown", 1578 sep->se_service); 1579 goto more; 1580 } 1581 sep->se_bi = bi; 1582 sep->se_wait = bi->bi_wait; 1583 } else 1584 sep->se_bi = NULL; 1585 argc = 0; 1586 for (arg = skip(&cp); cp; arg = skip(&cp)) { 1587 #if MULOG 1588 char *colon; 1589 1590 if (argc == 0 && (colon = strrchr(arg, ':'))) { 1591 while (arg < colon) { 1592 int x; 1593 char *ccp; 1594 1595 switch (*arg++) { 1596 case 'l': 1597 x = 1; 1598 if (isdigit(*arg)) { 1599 x = strtol(arg, &ccp, 0); 1600 if (ccp == arg) 1601 break; 1602 arg = ccp; 1603 } 1604 sep->se_log &= ~MULOG_RFC931; 1605 sep->se_log |= x; 1606 break; 1607 case 'a': 1608 sep->se_log |= MULOG_RFC931; 1609 break; 1610 default: 1611 break; 1612 } 1613 } 1614 arg = colon + 1; 1615 } 1616 #endif 1617 if (argc < MAXARGV) 1618 sep->se_argv[argc++] = newstr(arg); 1619 } 1620 while (argc <= MAXARGV) 1621 sep->se_argv[argc++] = NULL; 1622 #ifdef IPSEC 1623 sep->se_policy = policy ? newstr(policy) : NULL; 1624 #endif 1625 return (sep); 1626 } 1627 1628 void 1629 freeconfig(cp) 1630 struct servtab *cp; 1631 { 1632 int i; 1633 1634 if (cp->se_hostaddr) 1635 free(cp->se_hostaddr); 1636 if (cp->se_service) 1637 free(cp->se_service); 1638 if (cp->se_proto) 1639 free(cp->se_proto); 1640 if (cp->se_user) 1641 free(cp->se_user); 1642 /* Note: se_group is part of the newstr'ed se_user */ 1643 if (cp->se_server) 1644 free(cp->se_server); 1645 for (i = 0; i < MAXARGV; i++) 1646 if (cp->se_argv[i]) 1647 free(cp->se_argv[i]); 1648 #ifdef IPSEC 1649 if (cp->se_policy) 1650 free(cp->se_policy); 1651 #endif 1652 } 1653 1654 1655 /* 1656 * Safe skip - if skip returns null, log a syntax error in the 1657 * configuration file and exit. 1658 */ 1659 char * 1660 sskip(cpp) 1661 char **cpp; 1662 { 1663 char *cp; 1664 1665 cp = skip(cpp); 1666 if (cp == NULL) { 1667 syslog(LOG_ERR, "%s: syntax error", CONFIG); 1668 exit(-1); 1669 } 1670 return (cp); 1671 } 1672 1673 char * 1674 skip(cpp) 1675 char **cpp; 1676 { 1677 char *cp = *cpp; 1678 char *start; 1679 1680 if (*cpp == NULL) 1681 return ((char *)0); 1682 1683 again: 1684 while (*cp == ' ' || *cp == '\t') 1685 cp++; 1686 if (*cp == '\0') { 1687 int c; 1688 1689 c = getc(fconfig); 1690 (void) ungetc(c, fconfig); 1691 if (c == ' ' || c == '\t') 1692 if ((cp = nextline(fconfig))) 1693 goto again; 1694 *cpp = (char *)0; 1695 return ((char *)0); 1696 } 1697 start = cp; 1698 while (*cp && *cp != ' ' && *cp != '\t') 1699 cp++; 1700 if (*cp != '\0') 1701 *cp++ = '\0'; 1702 *cpp = cp; 1703 return (start); 1704 } 1705 1706 char * 1707 nextline(fd) 1708 FILE *fd; 1709 { 1710 char *cp; 1711 1712 if (fgets(line, sizeof (line), fd) == NULL) 1713 return ((char *)0); 1714 cp = strchr(line, '\n'); 1715 if (cp) 1716 *cp = '\0'; 1717 return (line); 1718 } 1719 1720 char * 1721 newstr(cp) 1722 char *cp; 1723 { 1724 if ((cp = strdup(cp ? cp : ""))) 1725 return (cp); 1726 syslog(LOG_ERR, "strdup: %m"); 1727 exit(-1); 1728 } 1729 1730 void 1731 inetd_setproctitle(a, s) 1732 char *a; 1733 int s; 1734 { 1735 int size; 1736 char *cp; 1737 struct sockaddr_storage ss; 1738 char buf[80]; 1739 char hbuf[NI_MAXHOST]; 1740 1741 cp = Argv[0]; 1742 size = sizeof(ss); 1743 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) { 1744 if (getnameinfo((struct sockaddr *)&ss, ss.ss_len, 1745 hbuf, sizeof(hbuf), NULL, 0, niflags) != 0) 1746 strcpy(hbuf, "?"); 1747 (void)snprintf(buf, sizeof buf, "-%s [%s]", a, hbuf); 1748 } else 1749 (void)snprintf(buf, sizeof buf, "-%s", a); 1750 strncpy(cp, buf, LastArg - cp); 1751 cp += strlen(cp); 1752 while (cp < LastArg) 1753 *cp++ = ' '; 1754 } 1755 1756 void 1757 bump_nofile() 1758 { 1759 #ifdef RLIMIT_NOFILE 1760 1761 #define FD_CHUNK 32 1762 1763 struct rlimit rl; 1764 1765 if (getrlimit(RLIMIT_NOFILE, &rl) < 0) { 1766 syslog(LOG_ERR, "getrlimit: %m"); 1767 return; 1768 } 1769 rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK); 1770 if (rl.rlim_cur <= rlim_ofile_cur) { 1771 syslog(LOG_ERR, 1772 "bump_nofile: cannot extend file limit, max = %d", 1773 (int)rl.rlim_cur); 1774 return; 1775 } 1776 1777 if (setrlimit(RLIMIT_NOFILE, &rl) < 0) { 1778 syslog(LOG_ERR, "setrlimit: %m"); 1779 return; 1780 } 1781 1782 rlim_ofile_cur = rl.rlim_cur; 1783 return; 1784 1785 #else 1786 syslog(LOG_ERR, "bump_nofile: cannot extend file limit"); 1787 return; 1788 #endif 1789 } 1790 1791 /* 1792 * Internet services provided internally by inetd: 1793 */ 1794 #define BUFSIZE 4096 1795 1796 /* ARGSUSED */ 1797 void 1798 echo_stream(s, sep) /* Echo service -- echo data back */ 1799 int s; 1800 struct servtab *sep; 1801 { 1802 char buffer[BUFSIZE]; 1803 int i; 1804 1805 inetd_setproctitle(sep->se_service, s); 1806 while ((i = read(s, buffer, sizeof(buffer))) > 0 && 1807 write(s, buffer, i) > 0) 1808 ; 1809 } 1810 1811 /* ARGSUSED */ 1812 void 1813 echo_dg(s, sep) /* Echo service -- echo data back */ 1814 int s; 1815 struct servtab *sep; 1816 { 1817 char buffer[BUFSIZE]; 1818 int i, size; 1819 struct sockaddr_storage ss; 1820 struct sockaddr *sa; 1821 1822 sa = (struct sockaddr *)&ss; 1823 size = sizeof(ss); 1824 if ((i = recvfrom(s, buffer, sizeof(buffer), 0, sa, &size)) < 0) 1825 return; 1826 if (port_good_dg(sa)) 1827 (void) sendto(s, buffer, i, 0, sa, size); 1828 } 1829 1830 /* ARGSUSED */ 1831 void 1832 discard_stream(s, sep) /* Discard service -- ignore data */ 1833 int s; 1834 struct servtab *sep; 1835 { 1836 char buffer[BUFSIZE]; 1837 1838 inetd_setproctitle(sep->se_service, s); 1839 while ((errno = 0, read(s, buffer, sizeof(buffer)) > 0) || 1840 errno == EINTR) 1841 ; 1842 } 1843 1844 /* ARGSUSED */ 1845 void 1846 discard_dg(s, sep) /* Discard service -- ignore data */ 1847 int s; 1848 struct servtab *sep; 1849 { 1850 char buffer[BUFSIZE]; 1851 1852 (void) read(s, buffer, sizeof(buffer)); 1853 } 1854 1855 #include <ctype.h> 1856 #define LINESIZ 72 1857 char ring[128]; 1858 char *endring; 1859 1860 void 1861 initring() 1862 { 1863 int i; 1864 1865 endring = ring; 1866 1867 for (i = 0; i <= 128; ++i) 1868 if (isprint(i)) 1869 *endring++ = i; 1870 } 1871 1872 /* ARGSUSED */ 1873 void 1874 chargen_stream(s, sep) /* Character generator */ 1875 int s; 1876 struct servtab *sep; 1877 { 1878 int len; 1879 char *rs, text[LINESIZ+2]; 1880 1881 inetd_setproctitle(sep->se_service, s); 1882 1883 if (!endring) { 1884 initring(); 1885 rs = ring; 1886 } 1887 1888 text[LINESIZ] = '\r'; 1889 text[LINESIZ + 1] = '\n'; 1890 for (rs = ring;;) { 1891 if ((len = endring - rs) >= LINESIZ) 1892 memmove(text, rs, LINESIZ); 1893 else { 1894 memmove(text, rs, len); 1895 memmove(text + len, ring, LINESIZ - len); 1896 } 1897 if (++rs == endring) 1898 rs = ring; 1899 if (write(s, text, sizeof(text)) != sizeof(text)) 1900 break; 1901 } 1902 } 1903 1904 /* ARGSUSED */ 1905 void 1906 chargen_dg(s, sep) /* Character generator */ 1907 int s; 1908 struct servtab *sep; 1909 { 1910 struct sockaddr_storage ss; 1911 struct sockaddr *sa; 1912 static char *rs; 1913 int len, size; 1914 char text[LINESIZ+2]; 1915 1916 if (endring == 0) { 1917 initring(); 1918 rs = ring; 1919 } 1920 1921 sa = (struct sockaddr *)&ss; 1922 size = sizeof(ss); 1923 if (recvfrom(s, text, sizeof(text), 0, sa, &size) < 0) 1924 return; 1925 1926 if (!port_good_dg(sa)) 1927 return; 1928 1929 if ((len = endring - rs) >= LINESIZ) 1930 memmove(text, rs, LINESIZ); 1931 else { 1932 memmove(text, rs, len); 1933 memmove(text + len, ring, LINESIZ - len); 1934 } 1935 if (++rs == endring) 1936 rs = ring; 1937 text[LINESIZ] = '\r'; 1938 text[LINESIZ + 1] = '\n'; 1939 (void) sendto(s, text, sizeof(text), 0, sa, size); 1940 } 1941 1942 /* 1943 * Return a machine readable date and time, in the form of the 1944 * number of seconds since midnight, Jan 1, 1900. Since gettimeofday 1945 * returns the number of seconds since midnight, Jan 1, 1970, 1946 * we must add 2208988800 seconds to this figure to make up for 1947 * some seventy years Bell Labs was asleep. 1948 */ 1949 1950 long 1951 machtime() 1952 { 1953 struct timeval tv; 1954 1955 if (gettimeofday(&tv, (struct timezone *)0) < 0) { 1956 if (debug) 1957 fprintf(stderr, "Unable to get time of day\n"); 1958 return (0L); 1959 } 1960 #define OFFSET ((u_long)25567 * 24*60*60) 1961 return (htonl((long)(tv.tv_sec + OFFSET))); 1962 #undef OFFSET 1963 } 1964 1965 /* ARGSUSED */ 1966 void 1967 machtime_stream(s, sep) 1968 int s; 1969 struct servtab *sep; 1970 { 1971 long result; 1972 1973 result = machtime(); 1974 (void) write(s, (char *) &result, sizeof(result)); 1975 } 1976 1977 /* ARGSUSED */ 1978 void 1979 machtime_dg(s, sep) 1980 int s; 1981 struct servtab *sep; 1982 { 1983 long result; 1984 struct sockaddr_storage ss; 1985 struct sockaddr *sa; 1986 int size; 1987 1988 sa = (struct sockaddr *)&ss; 1989 size = sizeof(ss); 1990 if (recvfrom(s, (char *)&result, sizeof(result), 0, sa, &size) < 0) 1991 return; 1992 if (!port_good_dg(sa)) 1993 return; 1994 result = machtime(); 1995 (void) sendto(s, (char *) &result, sizeof(result), 0, sa, size); 1996 } 1997 1998 /* ARGSUSED */ 1999 void 2000 daytime_stream(s, sep) /* Return human-readable time of day */ 2001 int s; 2002 struct servtab *sep; 2003 { 2004 char buffer[256]; 2005 time_t clock; 2006 int len; 2007 2008 clock = time((time_t *) 0); 2009 2010 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 2011 (void) write(s, buffer, len); 2012 } 2013 2014 /* ARGSUSED */ 2015 void 2016 daytime_dg(s, sep) /* Return human-readable time of day */ 2017 int s; 2018 struct servtab *sep; 2019 { 2020 char buffer[256]; 2021 time_t clock; 2022 struct sockaddr_storage ss; 2023 struct sockaddr *sa; 2024 int size, len; 2025 2026 clock = time((time_t *) 0); 2027 2028 sa = (struct sockaddr *)&ss; 2029 size = sizeof(ss); 2030 if (recvfrom(s, buffer, sizeof(buffer), 0, sa, &size) < 0) 2031 return; 2032 if (!port_good_dg(sa)) 2033 return; 2034 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 2035 (void) sendto(s, buffer, len, 0, sa, size); 2036 } 2037 2038 /* 2039 * print_service: 2040 * Dump relevant information to stderr 2041 */ 2042 void 2043 print_service(action, sep) 2044 char *action; 2045 struct servtab *sep; 2046 { 2047 if (isrpcservice(sep)) 2048 fprintf(stderr, 2049 "%s: %s rpcprog=%d, rpcvers = %d/%d, proto=%s, wait:max=%d.%d, user:group=%s.%s builtin=%lx server=%s" 2050 #ifdef IPSEC 2051 " policy=\"%s\"" 2052 #endif 2053 "\n", 2054 action, sep->se_service, 2055 sep->se_rpcprog, sep->se_rpcversh, sep->se_rpcversl, sep->se_proto, 2056 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 2057 (long)sep->se_bi, sep->se_server 2058 #ifdef IPSEC 2059 , (sep->se_policy ? sep->se_policy : "") 2060 #endif 2061 ); 2062 else 2063 fprintf(stderr, 2064 "%s: %s proto=%s, wait:max=%d.%d, user:group=%s.%s builtin=%lx server=%s" 2065 #ifdef IPSEC 2066 " policy=%s" 2067 #endif 2068 "\n", 2069 action, sep->se_service, sep->se_proto, 2070 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 2071 (long)sep->se_bi, sep->se_server 2072 #ifdef IPSEC 2073 , (sep->se_policy ? sep->se_policy : "") 2074 #endif 2075 ); 2076 } 2077 2078 void 2079 usage() 2080 { 2081 2082 #ifdef LIBWRAP 2083 (void)fprintf(stderr, "usage: %s [-dl] [conf]\n", __progname); 2084 #else 2085 (void)fprintf(stderr, "usage: %s [-d] [conf]\n", __progname); 2086 #endif 2087 exit(1); 2088 } 2089 2090 2091 /* 2092 * Based on TCPMUX.C by Mark K. Lottor November 1988 2093 * sri-nic::ps:<mkl>tcpmux.c 2094 */ 2095 2096 static int /* # of characters upto \r,\n or \0 */ 2097 getline(fd, buf, len) 2098 int fd; 2099 char *buf; 2100 int len; 2101 { 2102 int count = 0, n; 2103 2104 do { 2105 n = read(fd, buf, len-count); 2106 if (n == 0) 2107 return (count); 2108 if (n < 0) 2109 return (-1); 2110 while (--n >= 0) { 2111 if (*buf == '\r' || *buf == '\n' || *buf == '\0') 2112 return (count); 2113 count++; 2114 buf++; 2115 } 2116 } while (count < len); 2117 return (count); 2118 } 2119 2120 #define MAX_SERV_LEN (256+2) /* 2 bytes for \r\n */ 2121 2122 #define strwrite(fd, buf) (void) write(fd, buf, sizeof(buf)-1) 2123 2124 void 2125 tcpmux(ctrl, sep) 2126 int ctrl; 2127 struct servtab *sep; 2128 { 2129 char service[MAX_SERV_LEN+1]; 2130 int len; 2131 2132 /* Get requested service name */ 2133 if ((len = getline(ctrl, service, MAX_SERV_LEN)) < 0) { 2134 strwrite(ctrl, "-Error reading service name\r\n"); 2135 goto reject; 2136 } 2137 service[len] = '\0'; 2138 2139 if (debug) 2140 fprintf(stderr, "tcpmux: someone wants %s\n", service); 2141 2142 /* 2143 * Help is a required command, and lists available services, 2144 * one per line. 2145 */ 2146 if (!strcasecmp(service, "help")) { 2147 strwrite(ctrl, "+Available services:\r\n"); 2148 strwrite(ctrl, "help\r\n"); 2149 for (sep = servtab; sep; sep = sep->se_next) { 2150 if (!ISMUX(sep)) 2151 continue; 2152 (void)write(ctrl, sep->se_service, 2153 strlen(sep->se_service)); 2154 strwrite(ctrl, "\r\n"); 2155 } 2156 goto reject; 2157 } 2158 2159 /* Try matching a service in inetd.conf with the request */ 2160 for (sep = servtab; sep; sep = sep->se_next) { 2161 if (!ISMUX(sep)) 2162 continue; 2163 if (!strcasecmp(service, sep->se_service)) { 2164 if (ISMUXPLUS(sep)) 2165 strwrite(ctrl, "+Go\r\n"); 2166 run_service(ctrl, sep); 2167 return; 2168 } 2169 } 2170 strwrite(ctrl, "-Service not available\r\n"); 2171 reject: 2172 _exit(1); 2173 } 2174 2175 2176 #ifdef MULOG 2177 dolog(sep, ctrl) 2178 struct servtab *sep; 2179 int ctrl; 2180 { 2181 struct sockaddr_storage ss; 2182 struct sockaddr *sa = (struct sockaddr *)&ss; 2183 struct sockaddr_in *sin = (struct sockaddr_in *)&ss; 2184 int len = sizeof(ss); 2185 struct hostent *hp; 2186 char *host, *dp, buf[BUFSIZ], *rfc931_name(); 2187 int connected = 1; 2188 2189 switch (sep->se_family) { 2190 case AF_INET: 2191 #ifdef INET6 2192 case AF_INET6: 2193 #endif 2194 break; 2195 default; 2196 return; 2197 } 2198 2199 if (getpeername(ctrl, sa, &len) < 0) { 2200 if (errno != ENOTCONN) { 2201 syslog(LOG_ERR, "getpeername: %m"); 2202 return; 2203 } 2204 if (recvfrom(ctrl, buf, sizeof(buf), MSG_PEEK, sa, &len) < 0) { 2205 syslog(LOG_ERR, "recvfrom: %m"); 2206 return; 2207 } 2208 connected = 0; 2209 } 2210 switch (sa->sa_family) { 2211 case AF_INET: 2212 #ifdef INET6 2213 case AF_INET6: 2214 #endif 2215 break; 2216 default; 2217 syslog(LOG_ERR, "unexpected address family %u", sa->sa_family); 2218 return; 2219 } 2220 2221 if (getnameinfo(sa, sa->sa_len, buf, sizeof(buf), NULL, 0, 0) != 0) 2222 strcpy(buf, "?"); 2223 host = buf; 2224 2225 switch (sep->se_log & ~MULOG_RFC931) { 2226 case 0: 2227 return; 2228 case 1: 2229 if (curdom == NULL || *curdom == '\0') 2230 break; 2231 dp = host + strlen(host) - strlen(curdom); 2232 if (dp < host) 2233 break; 2234 if (debug) 2235 fprintf(stderr, "check \"%s\" against curdom \"%s\"\n", 2236 host, curdom); 2237 if (strcasecmp(dp, curdom) == 0) 2238 return; 2239 break; 2240 case 2: 2241 default: 2242 break; 2243 } 2244 2245 openlog("", LOG_NOWAIT, MULOG); 2246 2247 if (connected && (sep->se_log & MULOG_RFC931)) 2248 syslog(LOG_INFO, "%s@%s wants %s", 2249 rfc931_name(sa, ctrl), host, sep->se_service); 2250 else 2251 syslog(LOG_INFO, "%s wants %s", 2252 host, sep->se_service); 2253 } 2254 2255 /* 2256 * From tcp_log by 2257 * Wietse Venema, Eindhoven University of Technology, The Netherlands. 2258 */ 2259 #if 0 2260 static char sccsid[] = "@(#) rfc931.c 1.3 92/08/31 22:54:46"; 2261 #endif 2262 2263 #include <setjmp.h> 2264 2265 #define RFC931_PORT 113 /* Semi-well-known port */ 2266 #define TIMEOUT 4 2267 #define TIMEOUT2 10 2268 2269 static jmp_buf timebuf; 2270 2271 /* timeout - handle timeouts */ 2272 2273 static void timeout(sig) 2274 int sig; 2275 { 2276 longjmp(timebuf, sig); 2277 } 2278 2279 /* rfc931_name - return remote user name */ 2280 2281 char * 2282 rfc931_name(there, ctrl) 2283 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 int 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 *)sa)->sin_port; 2319 break; 2320 #ifdef INET6 2321 case AF_INET6: 2322 hisport = ((struct sockaddr_in6 *)sa)->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 2380 for (len = 0, cp = buf; len < strlen(buf); ) { 2381 int n; 2382 2383 if ((n = write(s, cp, strlen(buf) - len)) == -1) { 2384 close(s); 2385 alarm(0); 2386 return (result); 2387 } 2388 cp += n; 2389 len += n; 2390 } 2391 2392 /* Read response */ 2393 for (cp = buf; cp < buf + sizeof(buf) - 1; ) { 2394 char c; 2395 if (read(s, &c, 1) != 1) { 2396 close(s); 2397 alarm(0); 2398 return (result); 2399 } 2400 if (c == '\n') 2401 break; 2402 *cp++ = c; 2403 } 2404 *cp = '\0'; 2405 2406 if (sscanf(buf, "%u , %u : USERID :%*[^:]:%255s", &remote, &local, user) == 3 2407 && ntohs(hisport) == remote 2408 && ntohs(myport) == local) { 2409 2410 /* Strip trailing carriage return. */ 2411 if (cp = strchr(user, '\r')) 2412 *cp = 0; 2413 result = user; 2414 } 2415 2416 alarm(0); 2417 close(s); 2418 return (result); 2419 } 2420 #endif 2421 2422 /* 2423 * check if the port where send data to is one of the obvious ports 2424 * that are used for denial of service attacks like two echo ports 2425 * just echoing data between them 2426 */ 2427 int 2428 port_good_dg(sa) 2429 struct sockaddr *sa; 2430 { 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 port = ntohs(((struct sockaddr_in *)sa)->sin_port); 2440 break; 2441 #ifdef INET6 2442 case AF_INET6: 2443 port = ntohs(((struct sockaddr_in6 *)sa)->sin6_port); 2444 break; 2445 #endif 2446 default: 2447 /* XXX unsupported af, is it safe to assume it to be safe? */ 2448 return 1; 2449 } 2450 2451 for (i = 0; bad_ports[i] != 0; i++) 2452 if (port == bad_ports[i]) { 2453 bad = 1; 2454 break; 2455 } 2456 2457 if (bad) { 2458 if (getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), 2459 NULL, 0, niflags) != 0) 2460 strcpy(hbuf, "?"); 2461 syslog(LOG_WARNING,"Possible DoS attack from %s, Port %d", 2462 hbuf, port); 2463 return (0); 2464 } else 2465 return (1); 2466 } 2467 2468
Indexes created Fri Sep 26 20:09:58 GMT 2025