1 /* $NetBSD: inetd.c,v 1.69 2000/07/08 01:55:24 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 1.69 2000/07/08 01:55:24 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 FAITH_TYPE 3 347 #define ISMUX(sep) (((sep)->se_type == MUX_TYPE) || \ 348 ((sep)->se_type == MUXPLUS_TYPE)) 349 #define ISMUXPLUS(sep) ((sep)->se_type == MUXPLUS_TYPE) 350 351 352 void chargen_dg __P((int, struct servtab *)); 353 void chargen_stream __P((int, struct servtab *)); 354 void close_sep __P((struct servtab *)); 355 void config __P((int)); 356 void daytime_dg __P((int, struct servtab *)); 357 void daytime_stream __P((int, struct servtab *)); 358 void discard_dg __P((int, struct servtab *)); 359 void discard_stream __P((int, struct servtab *)); 360 void echo_dg __P((int, struct servtab *)); 361 void echo_stream __P((int, struct servtab *)); 362 void endconfig __P((void)); 363 struct servtab *enter __P((struct servtab *)); 364 void freeconfig __P((struct servtab *)); 365 struct servtab *getconfigent __P((void)); 366 void goaway __P((int)); 367 void machtime_dg __P((int, struct servtab *)); 368 void machtime_stream __P((int, struct servtab *)); 369 char *newstr __P((char *)); 370 char *nextline __P((FILE *)); 371 void print_service __P((char *, struct servtab *)); 372 void reapchild __P((int)); 373 void retry __P((int)); 374 void run_service __P((int, struct servtab *)); 375 int setconfig __P((void)); 376 void setup __P((struct servtab *)); 377 char *sskip __P((char **)); 378 char *skip __P((char **)); 379 void tcpmux __P((int, struct servtab *)); 380 void usage __P((void)); 381 void register_rpc __P((struct servtab *sep)); 382 void unregister_rpc __P((struct servtab *sep)); 383 void bump_nofile __P((void)); 384 void inetd_setproctitle __P((char *, int)); 385 void initring __P((void)); 386 long machtime __P((void)); 387 int port_good_dg __P((struct sockaddr *sa)); 388 static int getline __P((int, char *, int)); 389 int main __P((int, char *[], char *[])); 390 391 struct biltin { 392 char *bi_service; /* internally provided service name */ 393 int bi_socktype; /* type of socket supported */ 394 short bi_fork; /* 1 if should fork before call */ 395 short bi_wait; /* 1 if should wait for child */ 396 void (*bi_fn) __P((int, struct servtab *)); 397 /* function which performs it */ 398 } biltins[] = { 399 /* Echo received data */ 400 { "echo", SOCK_STREAM, 1, 0, echo_stream }, 401 { "echo", SOCK_DGRAM, 0, 0, echo_dg }, 402 403 /* Internet /dev/null */ 404 { "discard", SOCK_STREAM, 1, 0, discard_stream }, 405 { "discard", SOCK_DGRAM, 0, 0, discard_dg }, 406 407 /* Return 32 bit time since 1970 */ 408 { "time", SOCK_STREAM, 0, 0, machtime_stream }, 409 { "time", SOCK_DGRAM, 0, 0, machtime_dg }, 410 411 /* Return human-readable time */ 412 { "daytime", SOCK_STREAM, 0, 0, daytime_stream }, 413 { "daytime", SOCK_DGRAM, 0, 0, daytime_dg }, 414 415 /* Familiar character generator */ 416 { "chargen", SOCK_STREAM, 1, 0, chargen_stream }, 417 { "chargen", SOCK_DGRAM, 0, 0, chargen_dg }, 418 419 { "tcpmux", SOCK_STREAM, 1, 0, tcpmux }, 420 421 { NULL } 422 }; 423 424 /* list of "bad" ports. I.e. ports that are most obviously used for 425 * "cycling packets" denial of service attacks. See /etc/services. 426 * List must end with port number "0". 427 */ 428 429 u_int16_t bad_ports[] = { 7, 9, 13, 19, 37, 0}; 430 431 432 #define NUMINT (sizeof(intab) / sizeof(struct inent)) 433 char *CONFIG = _PATH_INETDCONF; 434 char **Argv; 435 char *LastArg; 436 extern char *__progname; 437 438 int 439 main(argc, argv, envp) 440 int argc; 441 char *argv[], *envp[]; 442 { 443 struct servtab *sep, *nsep; 444 struct sigvec sv; 445 int ch, dofork; 446 pid_t pid; 447 448 Argv = argv; 449 if (envp == 0 || *envp == 0) 450 envp = argv; 451 while (*envp) 452 envp++; 453 LastArg = envp[-1] + strlen(envp[-1]); 454 455 while ((ch = getopt(argc, argv, 456 #ifdef LIBWRAP 457 "dl" 458 #else 459 "d" 460 #endif 461 )) != -1) 462 switch(ch) { 463 case 'd': 464 debug = 1; 465 options |= SO_DEBUG; 466 break; 467 #ifdef LIBWRAP 468 case 'l': 469 lflag = 1; 470 break; 471 #endif 472 case '?': 473 default: 474 usage(); 475 } 476 argc -= optind; 477 argv += optind; 478 479 if (argc > 0) 480 CONFIG = argv[0]; 481 482 if (debug == 0) 483 daemon(0, 0); 484 openlog(__progname, LOG_PID | LOG_NOWAIT, LOG_DAEMON); 485 pidfile(NULL); 486 487 #ifdef RLIMIT_NOFILE 488 if (getrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) { 489 syslog(LOG_ERR, "getrlimit: %m"); 490 } else { 491 rlim_ofile_cur = rlim_ofile.rlim_cur; 492 if (rlim_ofile_cur == RLIM_INFINITY) /* ! */ 493 rlim_ofile_cur = OPEN_MAX; 494 } 495 #endif 496 497 memset(&sv, 0, sizeof(sv)); 498 sv.sv_mask = SIGBLOCK; 499 sv.sv_handler = retry; 500 sigvec(SIGALRM, &sv, (struct sigvec *)0); 501 config(SIGHUP); 502 sv.sv_handler = config; 503 sigvec(SIGHUP, &sv, (struct sigvec *)0); 504 sv.sv_handler = reapchild; 505 sigvec(SIGCHLD, &sv, (struct sigvec *)0); 506 sv.sv_handler = goaway; 507 sigvec(SIGTERM, &sv, (struct sigvec *)0); 508 sv.sv_handler = goaway; 509 sigvec(SIGINT, &sv, (struct sigvec *)0); 510 sv.sv_mask = 0L; 511 sv.sv_handler = SIG_IGN; 512 sigvec(SIGPIPE, &sv, (struct sigvec *)0); 513 514 { 515 /* space for daemons to overwrite environment for ps */ 516 #define DUMMYSIZE 100 517 char dummy[DUMMYSIZE]; 518 519 (void)memset(dummy, 'x', DUMMYSIZE - 1); 520 dummy[DUMMYSIZE - 1] = '\0'; 521 522 (void)setenv("inetd_dummy", dummy, 1); 523 } 524 525 for (;;) { 526 int n, ctrl; 527 fd_set readable; 528 529 if (nsock == 0) { 530 (void) sigblock(SIGBLOCK); 531 while (nsock == 0) 532 sigpause(0L); 533 (void) sigsetmask(0L); 534 } 535 readable = allsock; 536 if ((n = select(maxsock + 1, &readable, (fd_set *)0, 537 (fd_set *)0, (struct timeval *)0)) <= 0) { 538 if (n == -1 && errno != EINTR) { 539 syslog(LOG_WARNING, "select: %m"); 540 sleep(1); 541 } 542 continue; 543 } 544 for (sep = servtab; n && sep; sep = nsep) { 545 nsep = sep->se_next; 546 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) { 547 n--; 548 if (debug) 549 fprintf(stderr, "someone wants %s\n", sep->se_service); 550 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 551 /* XXX here do the libwrap check-before-accept */ 552 ctrl = accept(sep->se_fd, (struct sockaddr *)0, 553 (int *)0); 554 if (debug) 555 fprintf(stderr, "accept, ctrl %d\n", ctrl); 556 if (ctrl < 0) { 557 if (errno != EINTR) 558 syslog(LOG_WARNING, 559 "accept (for %s): %m", 560 sep->se_service); 561 continue; 562 } 563 } else 564 ctrl = sep->se_fd; 565 (void) sigblock(SIGBLOCK); 566 pid = 0; 567 #ifdef LIBWRAP_INTERNAL 568 dofork = 1; 569 #else 570 dofork = (sep->se_bi == 0 || sep->se_bi->bi_fork); 571 #endif 572 if (dofork) { 573 if (sep->se_count++ == 0) 574 (void)gettimeofday(&sep->se_time, 575 (struct timezone *)0); 576 else if (sep->se_count >= sep->se_max) { 577 struct timeval now; 578 579 (void)gettimeofday(&now, (struct timezone *)0); 580 if (now.tv_sec - sep->se_time.tv_sec > 581 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 == SOCK_STREAM) 589 close(ctrl); 590 close_sep(sep); 591 sigsetmask(0L); 592 if (!timingout) { 593 timingout = 1; 594 alarm(RETRYTIME); 595 } 596 continue; 597 } 598 } 599 pid = fork(); 600 if (pid < 0) { 601 syslog(LOG_ERR, "fork: %m"); 602 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 603 close(ctrl); 604 sigsetmask(0L); 605 sleep(1); 606 continue; 607 } 608 if (pid != 0 && sep->se_wait) { 609 sep->se_wait = pid; 610 FD_CLR(sep->se_fd, &allsock); 611 nsock--; 612 } 613 if (pid == 0) { 614 sv.sv_mask = 0L; 615 sv.sv_handler = SIG_DFL; 616 sigvec(SIGPIPE, &sv, (struct sigvec *)0); 617 if (debug) 618 setsid(); 619 } 620 } 621 sigsetmask(0L); 622 if (pid == 0) { 623 run_service(ctrl, sep); 624 if (dofork) 625 exit(0); 626 } 627 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 628 close(ctrl); 629 } 630 } 631 } 632 } 633 634 void 635 run_service(ctrl, sep) 636 int ctrl; 637 struct servtab *sep; 638 { 639 struct passwd *pwd; 640 struct group *grp = NULL; /* XXX gcc */ 641 char buf[NI_MAXSERV]; 642 #ifdef LIBWRAP 643 struct request_info req; 644 int denied; 645 char *service = NULL; /* XXX gcc */ 646 #endif 647 648 #ifdef LIBWRAP 649 #ifndef LIBWRAP_INTERNAL 650 if (sep->se_bi == 0) 651 #endif 652 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 653 request_init(&req, RQ_DAEMON, sep->se_argv[0] ? 654 sep->se_argv[0] : sep->se_service, RQ_FILE, ctrl, NULL); 655 fromhost(&req); 656 denied = !hosts_access(&req); 657 if (denied || lflag) { 658 if (getnameinfo(&sep->se_ctrladdr, 659 sep->se_ctrladdr.sa_len, NULL, 0, 660 buf, sizeof(buf), 0) != 0) { 661 /* shouldn't happen */ 662 (void)snprintf(buf, sizeof buf, "%d", 663 ntohs(sep->se_ctrladdr_in.sin_port)); 664 } 665 service = buf; 666 } 667 if (denied) { 668 syslog(deny_severity, 669 "refused connection from %.500s, service %s (%s)", 670 eval_client(&req), service, sep->se_proto); 671 goto reject; 672 } 673 if (lflag) { 674 syslog(allow_severity, 675 "connection from %.500s, service %s (%s)", 676 eval_client(&req), service, sep->se_proto); 677 } 678 } 679 #endif /* LIBWRAP */ 680 681 if (sep->se_bi) { 682 (*sep->se_bi->bi_fn)(ctrl, sep); 683 } else { 684 if ((pwd = getpwnam(sep->se_user)) == NULL) { 685 syslog(LOG_ERR, "%s/%s: %s: No such user", 686 sep->se_service, sep->se_proto, sep->se_user); 687 goto reject; 688 } 689 if (sep->se_group && 690 (grp = getgrnam(sep->se_group)) == NULL) { 691 syslog(LOG_ERR, "%s/%s: %s: No such group", 692 sep->se_service, sep->se_proto, sep->se_group); 693 goto reject; 694 } 695 if (pwd->pw_uid) { 696 if (sep->se_group) 697 pwd->pw_gid = grp->gr_gid; 698 if (setgid(pwd->pw_gid) < 0) { 699 syslog(LOG_ERR, 700 "%s/%s: can't set gid %d: %m", sep->se_service, 701 sep->se_proto, pwd->pw_gid); 702 goto reject; 703 } 704 (void) initgroups(pwd->pw_name, 705 pwd->pw_gid); 706 if (setuid(pwd->pw_uid) < 0) { 707 syslog(LOG_ERR, 708 "%s/%s: can't set uid %d: %m", sep->se_service, 709 sep->se_proto, pwd->pw_uid); 710 goto reject; 711 } 712 } else if (sep->se_group) { 713 (void) setgid((gid_t)grp->gr_gid); 714 } 715 if (debug) 716 fprintf(stderr, "%d execl %s\n", 717 getpid(), sep->se_server); 718 #ifdef MULOG 719 if (sep->se_log) 720 dolog(sep, ctrl); 721 #endif 722 /* Set our control descriptor to not close-on-exec... */ 723 if (fcntl(ctrl, F_SETFD, 0) < 0) 724 syslog(LOG_ERR, "fcntl (F_SETFD, 0): %m"); 725 /* ...and dup it to stdin, stdout, and stderr. */ 726 if (ctrl != 0) { 727 dup2(ctrl, 0); 728 close(ctrl); 729 ctrl = 0; 730 } 731 dup2(0, 1); 732 dup2(0, 2); 733 #ifdef RLIMIT_NOFILE 734 if (rlim_ofile.rlim_cur != rlim_ofile_cur && 735 setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) 736 syslog(LOG_ERR, "setrlimit: %m"); 737 #endif 738 execv(sep->se_server, sep->se_argv); 739 syslog(LOG_ERR, "cannot execute %s: %m", sep->se_server); 740 reject: 741 if (sep->se_socktype != SOCK_STREAM) 742 recv(ctrl, buf, sizeof (buf), 0); 743 _exit(1); 744 } 745 } 746 747 void 748 reapchild(signo) 749 int signo; 750 { 751 int status; 752 pid_t pid; 753 struct servtab *sep; 754 755 for (;;) { 756 pid = wait3(&status, WNOHANG, (struct rusage *)0); 757 if (pid <= 0) 758 break; 759 if (debug) 760 fprintf(stderr, "%d reaped, status %#x\n", 761 pid, status); 762 for (sep = servtab; sep; sep = sep->se_next) 763 if (sep->se_wait == pid) { 764 if (WIFEXITED(status) && WEXITSTATUS(status)) 765 syslog(LOG_WARNING, 766 "%s: exit status 0x%x", 767 sep->se_server, WEXITSTATUS(status)); 768 else if (WIFSIGNALED(status)) 769 syslog(LOG_WARNING, 770 "%s: exit signal 0x%x", 771 sep->se_server, WTERMSIG(status)); 772 sep->se_wait = 1; 773 FD_SET(sep->se_fd, &allsock); 774 nsock++; 775 if (debug) 776 fprintf(stderr, "restored %s, fd %d\n", 777 sep->se_service, sep->se_fd); 778 } 779 } 780 } 781 782 void 783 config(signo) 784 int signo; 785 { 786 struct servtab *sep, *cp, **sepp; 787 long omask; 788 int n; 789 790 if (!setconfig()) { 791 syslog(LOG_ERR, "%s: %m", CONFIG); 792 return; 793 } 794 for (sep = servtab; sep; sep = sep->se_next) 795 sep->se_checked = 0; 796 while ((cp = getconfigent())) { 797 for (sep = servtab; sep; sep = sep->se_next) 798 if (strcmp(sep->se_service, cp->se_service) == 0 && 799 strcmp(sep->se_hostaddr, cp->se_hostaddr) == 0 && 800 strcmp(sep->se_proto, cp->se_proto) == 0 && 801 ISMUX(sep) == ISMUX(cp)) 802 break; 803 if (sep != 0) { 804 int i; 805 806 #define SWAP(type, a, b) {type c=(type)a; (type)a=(type)b; (type)b=(type)c;} 807 808 omask = sigblock(SIGBLOCK); 809 /* 810 * sep->se_wait may be holding the pid of a daemon 811 * that we're waiting for. If so, don't overwrite 812 * it unless the config file explicitly says don't 813 * wait. 814 */ 815 if (cp->se_bi == 0 && 816 (sep->se_wait == 1 || cp->se_wait == 0)) 817 sep->se_wait = cp->se_wait; 818 SWAP(char *, sep->se_user, cp->se_user); 819 SWAP(char *, sep->se_group, cp->se_group); 820 SWAP(char *, sep->se_server, cp->se_server); 821 for (i = 0; i < MAXARGV; i++) 822 SWAP(char *, sep->se_argv[i], cp->se_argv[i]); 823 #ifdef IPSEC 824 SWAP(char *, sep->se_policy, cp->se_policy); 825 #endif 826 SWAP(int, cp->se_type, sep->se_type); 827 SWAP(int, cp->se_max, sep->se_max); 828 #undef SWAP 829 if (isrpcservice(sep)) 830 unregister_rpc(sep); 831 sep->se_rpcversl = cp->se_rpcversl; 832 sep->se_rpcversh = cp->se_rpcversh; 833 sigsetmask(omask); 834 freeconfig(cp); 835 if (debug) 836 print_service("REDO", sep); 837 } else { 838 sep = enter(cp); 839 if (debug) 840 print_service("ADD ", sep); 841 } 842 sep->se_checked = 1; 843 844 switch (sep->se_family) { 845 case AF_LOCAL: 846 if (sep->se_fd != -1) 847 break; 848 n = strlen(sep->se_service); 849 if (n > sizeof(sep->se_ctrladdr_un.sun_path)) { 850 syslog(LOG_ERR, "%s: address too long", 851 sep->se_service); 852 sep->se_checked = 0; 853 continue; 854 } 855 (void)unlink(sep->se_service); 856 strncpy(sep->se_ctrladdr_un.sun_path, 857 sep->se_service, n); 858 sep->se_ctrladdr_un.sun_family = AF_LOCAL; 859 sep->se_ctrladdr_size = n + 860 sizeof(sep->se_ctrladdr_un) - 861 sizeof(sep->se_ctrladdr_un.sun_path); 862 if (!ISMUX(sep)) 863 setup(sep); 864 break; 865 case AF_INET: 866 #ifdef INET6 867 case AF_INET6: 868 #endif 869 { 870 struct addrinfo hints, *res; 871 char *host, *port; 872 int error; 873 int s; 874 875 /* check if the family is supported */ 876 s = socket(sep->se_family, SOCK_DGRAM, 0); 877 if (s < 0) { 878 syslog(LOG_WARNING, 879 "%s/%s: %s: the address family is not supported by the kernel", 880 sep->se_service, sep->se_proto, 881 sep->se_hostaddr); 882 sep->se_checked = 0; 883 continue; 884 } 885 close(s); 886 887 memset(&hints, 0, sizeof(hints)); 888 hints.ai_family = sep->se_family; 889 hints.ai_socktype = sep->se_socktype; 890 hints.ai_flags = AI_PASSIVE; 891 if (!strcmp(sep->se_hostaddr, "*")) 892 host = NULL; 893 else 894 host = sep->se_hostaddr; 895 if (isrpcservice(sep) || ISMUX(sep)) 896 port = "0"; 897 else 898 port = sep->se_service; 899 error = getaddrinfo(host, port, &hints, &res); 900 if (error) { 901 if (error == EAI_SERVICE) { 902 /* gai_strerror not friendly enough */ 903 syslog(LOG_WARNING, "%s/%s: " 904 "unknown service", 905 sep->se_service, sep->se_proto); 906 } else { 907 syslog(LOG_ERR, "%s/%s: %s: %s", 908 sep->se_service, sep->se_proto, 909 sep->se_hostaddr, 910 gai_strerror(error)); 911 } 912 sep->se_checked = 0; 913 continue; 914 } 915 if (res->ai_next) { 916 syslog(LOG_ERR, 917 "%s/%s: %s: resolved to multiple addr", 918 sep->se_service, sep->se_proto, 919 sep->se_hostaddr); 920 sep->se_checked = 0; 921 freeaddrinfo(res); 922 continue; 923 } 924 memcpy(&sep->se_ctrladdr, res->ai_addr, 925 res->ai_addrlen); 926 if (ISMUX(sep)) { 927 sep->se_fd = -1; 928 freeaddrinfo(res); 929 continue; 930 } 931 sep->se_ctrladdr_size = res->ai_addrlen; 932 freeaddrinfo(res); 933 #ifdef RPC 934 if (isrpcservice(sep)) { 935 struct rpcent *rp; 936 937 sep->se_rpcprog = atoi(sep->se_service); 938 if (sep->se_rpcprog == 0) { 939 rp = getrpcbyname(sep->se_service); 940 if (rp == 0) { 941 syslog(LOG_ERR, 942 "%s/%s: unknown service", 943 sep->se_service, 944 sep->se_proto); 945 sep->se_checked = 0; 946 continue; 947 } 948 sep->se_rpcprog = rp->r_number; 949 } 950 if (sep->se_fd == -1 && !ISMUX(sep)) 951 setup(sep); 952 if (sep->se_fd != -1) 953 register_rpc(sep); 954 } else 955 #endif 956 { 957 if (sep->se_fd >= 0) 958 close_sep(sep); 959 if (sep->se_fd == -1 && !ISMUX(sep)) 960 setup(sep); 961 } 962 } 963 } 964 } 965 endconfig(); 966 /* 967 * Purge anything not looked at above. 968 */ 969 omask = sigblock(SIGBLOCK); 970 sepp = &servtab; 971 while ((sep = *sepp)) { 972 if (sep->se_checked) { 973 sepp = &sep->se_next; 974 continue; 975 } 976 *sepp = sep->se_next; 977 if (sep->se_fd >= 0) 978 close_sep(sep); 979 if (isrpcservice(sep)) 980 unregister_rpc(sep); 981 if (sep->se_family == AF_LOCAL) 982 (void)unlink(sep->se_service); 983 if (debug) 984 print_service("FREE", sep); 985 freeconfig(sep); 986 free((char *)sep); 987 } 988 (void) sigsetmask(omask); 989 } 990 991 void 992 retry(signo) 993 int signo; 994 { 995 struct servtab *sep; 996 997 timingout = 0; 998 for (sep = servtab; sep; sep = sep->se_next) { 999 if (sep->se_fd == -1 && !ISMUX(sep)) { 1000 switch (sep->se_family) { 1001 case AF_LOCAL: 1002 case AF_INET: 1003 #ifdef INET6 1004 case AF_INET6: 1005 #endif 1006 setup(sep); 1007 if (sep->se_fd != -1 && isrpcservice(sep)) 1008 register_rpc(sep); 1009 break; 1010 } 1011 } 1012 } 1013 } 1014 1015 void 1016 goaway(signo) 1017 int signo; 1018 { 1019 struct servtab *sep; 1020 1021 for (sep = servtab; sep; sep = sep->se_next) { 1022 if (sep->se_fd == -1) 1023 continue; 1024 1025 switch (sep->se_family) { 1026 case AF_LOCAL: 1027 (void)unlink(sep->se_service); 1028 break; 1029 case AF_INET: 1030 #ifdef INET6 1031 case AF_INET6: 1032 #endif 1033 if (sep->se_wait == 1 && isrpcservice(sep)) 1034 unregister_rpc(sep); 1035 break; 1036 } 1037 (void)close(sep->se_fd); 1038 } 1039 exit(0); 1040 } 1041 1042 void 1043 setup(sep) 1044 struct servtab *sep; 1045 { 1046 int on = 1; 1047 1048 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) { 1049 if (debug) 1050 fprintf(stderr, "socket failed on %s/%s: %s\n", 1051 sep->se_service, sep->se_proto, strerror(errno)); 1052 syslog(LOG_ERR, "%s/%s: socket: %m", 1053 sep->se_service, sep->se_proto); 1054 return; 1055 } 1056 /* Set all listening sockets to close-on-exec. */ 1057 if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) 1058 syslog(LOG_ERR, "fcntl (F_SETFD, FD_CLOEXEC): %m"); 1059 1060 #define turnon(fd, opt) \ 1061 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 1062 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 1063 turnon(sep->se_fd, SO_DEBUG) < 0) 1064 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 1065 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 1066 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 1067 #undef turnon 1068 1069 /* Set the socket buffer sizes, if specified. */ 1070 if (sep->se_sndbuf != 0 && setsockopt(sep->se_fd, SOL_SOCKET, 1071 SO_SNDBUF, (char *)&sep->se_sndbuf, sizeof(sep->se_sndbuf)) < 0) 1072 syslog(LOG_ERR, "setsockopt (SO_SNDBUF %d): %m", 1073 sep->se_sndbuf); 1074 if (sep->se_rcvbuf != 0 && setsockopt(sep->se_fd, SOL_SOCKET, 1075 SO_RCVBUF, (char *)&sep->se_rcvbuf, sizeof(sep->se_rcvbuf)) < 0) 1076 syslog(LOG_ERR, "setsockopt (SO_RCVBUF %d): %m", 1077 sep->se_rcvbuf); 1078 if (sep->se_type == FAITH_TYPE && setsockopt(sep->se_fd, IPPROTO_IPV6, 1079 IPV6_FAITH, (char *)&on, sizeof(on)) < 0) 1080 syslog(LOG_ERR, "setsockopt (IPV6_FAITH): %m"); 1081 #ifdef IPSEC 1082 if (ipsecsetup(sep->se_family, sep->se_fd, sep->se_policy) < 0 && 1083 sep->se_policy) { 1084 syslog(LOG_ERR, "%s/%s: ipsec setup failed", 1085 sep->se_service, sep->se_proto); 1086 (void)close(sep->se_fd); 1087 sep->se_fd = -1; 1088 return; 1089 } 1090 #endif 1091 1092 if (bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size) < 0) { 1093 if (debug) 1094 fprintf(stderr, "bind failed on %s/%s: %s\n", 1095 sep->se_service, sep->se_proto, strerror(errno)); 1096 syslog(LOG_ERR, "%s/%s: bind: %m", 1097 sep->se_service, sep->se_proto); 1098 (void) close(sep->se_fd); 1099 sep->se_fd = -1; 1100 if (!timingout) { 1101 timingout = 1; 1102 alarm(RETRYTIME); 1103 } 1104 return; 1105 } 1106 if (sep->se_socktype == SOCK_STREAM) 1107 listen(sep->se_fd, 10); 1108 1109 FD_SET(sep->se_fd, &allsock); 1110 nsock++; 1111 if (sep->se_fd > maxsock) { 1112 maxsock = sep->se_fd; 1113 if (maxsock > rlim_ofile_cur - FD_MARGIN) 1114 bump_nofile(); 1115 } 1116 if (debug) 1117 fprintf(stderr, "registered %s on %d\n", 1118 sep->se_server, sep->se_fd); 1119 } 1120 1121 /* 1122 * Finish with a service and its socket. 1123 */ 1124 void 1125 close_sep(sep) 1126 struct servtab *sep; 1127 { 1128 if (sep->se_fd >= 0) { 1129 nsock--; 1130 FD_CLR(sep->se_fd, &allsock); 1131 (void) close(sep->se_fd); 1132 sep->se_fd = -1; 1133 } 1134 sep->se_count = 0; 1135 /* 1136 * Don't keep the pid of this running deamon: when reapchild() 1137 * reaps this pid, it would erroneously increment nsock. 1138 */ 1139 if (sep->se_wait > 1) 1140 sep->se_wait = 1; 1141 } 1142 1143 void 1144 register_rpc(sep) 1145 struct servtab *sep; 1146 { 1147 #ifdef RPC 1148 int n; 1149 struct netbuf nbuf; 1150 struct sockaddr_storage ss; 1151 struct netconfig *nconf; 1152 1153 if ((nconf = getnetconfigent(sep->se_proto+4)) == NULL) { 1154 syslog(LOG_ERR, "%s: getnetconfigent failed", 1155 sep->se_proto); 1156 return; 1157 } 1158 n = sizeof ss; 1159 if (getsockname(sep->se_fd, (struct sockaddr *)&ss, &n) < 0) { 1160 syslog(LOG_ERR, "%s/%s: getsockname: %m", 1161 sep->se_service, sep->se_proto); 1162 return; 1163 } 1164 1165 nbuf.buf = &ss; 1166 nbuf.len = ss.ss_len; 1167 nbuf.maxlen = sizeof (struct sockaddr_storage); 1168 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1169 if (debug) 1170 fprintf(stderr, "rpcb_set: %u %d %s %s\n", 1171 sep->se_rpcprog, n, nconf->nc_netid, 1172 taddr2uaddr(nconf, &nbuf)); 1173 (void)rpcb_unset(sep->se_rpcprog, n, nconf); 1174 if (!rpcb_set(sep->se_rpcprog, n, nconf, &nbuf)) 1175 syslog(LOG_ERR, "rpcb_set: %u %d %s %s%s", 1176 sep->se_rpcprog, n, nconf->nc_netid, 1177 taddr2uaddr(nconf, &nbuf), clnt_spcreateerror("")); 1178 } 1179 #endif /* RPC */ 1180 } 1181 1182 void 1183 unregister_rpc(sep) 1184 struct servtab *sep; 1185 { 1186 #ifdef RPC 1187 int n; 1188 struct netconfig *nconf; 1189 1190 if ((nconf = getnetconfigent(sep->se_proto+4)) == NULL) { 1191 syslog(LOG_ERR, "%s: getnetconfigent failed", 1192 sep->se_proto); 1193 return; 1194 } 1195 1196 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1197 if (debug) 1198 fprintf(stderr, "rpcb_unset(%u, %d, %s)\n", 1199 sep->se_rpcprog, n, nconf->nc_netid); 1200 if (!rpcb_unset(sep->se_rpcprog, n, nconf)) 1201 syslog(LOG_ERR, "rpcb_unset(%u, %d, %s) failed\n", 1202 sep->se_rpcprog, n, nconf->nc_netid); 1203 } 1204 #endif /* RPC */ 1205 } 1206 1207 1208 struct servtab * 1209 enter(cp) 1210 struct servtab *cp; 1211 { 1212 struct servtab *sep; 1213 long omask; 1214 1215 sep = (struct servtab *)malloc(sizeof (*sep)); 1216 if (sep == (struct servtab *)0) { 1217 syslog(LOG_ERR, "Out of memory."); 1218 exit(-1); 1219 } 1220 *sep = *cp; 1221 sep->se_fd = -1; 1222 sep->se_rpcprog = -1; 1223 omask = sigblock(SIGBLOCK); 1224 sep->se_next = servtab; 1225 servtab = sep; 1226 sigsetmask(omask); 1227 return (sep); 1228 } 1229 1230 FILE *fconfig = NULL; 1231 struct servtab serv; 1232 char line[LINE_MAX]; 1233 char *defhost; 1234 #ifdef IPSEC 1235 static char *policy = NULL; 1236 #endif 1237 1238 int 1239 setconfig() 1240 { 1241 if (defhost) 1242 free(defhost); 1243 defhost = newstr("*"); 1244 #ifdef IPSEC 1245 if (policy) 1246 free(policy); 1247 policy = NULL; 1248 #endif 1249 if (fconfig != NULL) { 1250 fseek(fconfig, 0L, SEEK_SET); 1251 return (1); 1252 } 1253 fconfig = fopen(CONFIG, "r"); 1254 return (fconfig != NULL); 1255 } 1256 1257 void 1258 endconfig() 1259 { 1260 if (fconfig) { 1261 (void) fclose(fconfig); 1262 fconfig = NULL; 1263 } 1264 if (defhost) { 1265 free(defhost); 1266 defhost = 0; 1267 } 1268 } 1269 1270 struct servtab * 1271 getconfigent() 1272 { 1273 struct servtab *sep = &serv; 1274 int argc, val; 1275 char *cp, *cp0, *arg, *buf0, *buf1, *sz0, *sz1; 1276 static char TCPMUX_TOKEN[] = "tcpmux/"; 1277 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) 1278 char *hostdelim; 1279 1280 more: 1281 while ((cp = nextline(fconfig))) { 1282 #ifdef IPSEC 1283 /* lines starting with #@ is not a comment, but the policy */ 1284 if (cp[0] == '#' && cp[1] == '@') { 1285 char *p; 1286 for (p = cp + 2; p && *p && isspace(*p); p++) 1287 ; 1288 if (*p == '\0') { 1289 if (policy) 1290 free(policy); 1291 policy = NULL; 1292 } else { 1293 if (ipsecsetup_test(p) < 0) { 1294 syslog(LOG_ERR, 1295 "%s: invalid ipsec policy \"%s\"", 1296 CONFIG, p); 1297 exit(-1); 1298 } else { 1299 if (policy) 1300 free(policy); 1301 policy = newstr(p); 1302 } 1303 } 1304 } 1305 #endif 1306 if (*cp == '#' || *cp == '\0') 1307 continue; 1308 #ifdef MULOG 1309 /* Avoid use of `skip' if there is a danger of it looking 1310 * at continuation lines. 1311 */ 1312 do { 1313 cp++; 1314 } while (*cp == ' ' || *cp == '\t'); 1315 if (*cp == '\0') 1316 continue; 1317 if ((arg = skip(&cp)) == NULL) 1318 continue; 1319 if (strcmp(arg, "DOMAIN")) 1320 continue; 1321 if (curdom) 1322 free(curdom); 1323 curdom = NULL; 1324 while (*cp == ' ' || *cp == '\t') 1325 cp++; 1326 if (*cp == '\0') 1327 continue; 1328 arg = cp; 1329 while (*cp && *cp != ' ' && *cp != '\t') 1330 cp++; 1331 if (*cp != '\0') 1332 *cp++ = '\0'; 1333 curdom = newstr(arg); 1334 #endif 1335 break; 1336 } 1337 if (cp == NULL) 1338 return ((struct servtab *)0); 1339 /* 1340 * clear the static buffer, since some fields (se_ctrladdr, 1341 * for example) don't get initialized here. 1342 */ 1343 memset((caddr_t)sep, 0, sizeof *sep); 1344 arg = skip(&cp); 1345 if (cp == NULL) { 1346 /* got an empty line containing just blanks/tabs. */ 1347 goto more; 1348 } 1349 /* Check for a host name. */ 1350 hostdelim = strrchr(arg, ':'); 1351 if (hostdelim) { 1352 *hostdelim = '\0'; 1353 if (arg[0] == '[' && hostdelim > arg && hostdelim[-1] == ']') { 1354 hostdelim[-1] = '\0'; 1355 sep->se_hostaddr = newstr(arg + 1); 1356 } else 1357 sep->se_hostaddr = newstr(arg); 1358 arg = hostdelim + 1; 1359 /* 1360 * If the line is of the form `host:', then just change the 1361 * default host for the following lines. 1362 */ 1363 if (*arg == '\0') { 1364 arg = skip(&cp); 1365 if (cp == NULL) { 1366 free(defhost); 1367 defhost = sep->se_hostaddr; 1368 goto more; 1369 } 1370 } 1371 } else 1372 sep->se_hostaddr = newstr(defhost); 1373 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1374 char *c = arg + MUX_LEN; 1375 if (*c == '+') { 1376 sep->se_type = MUXPLUS_TYPE; 1377 c++; 1378 } else 1379 sep->se_type = MUX_TYPE; 1380 sep->se_service = newstr(c); 1381 } else { 1382 sep->se_service = newstr(arg); 1383 sep->se_type = NORM_TYPE; 1384 } 1385 1386 arg = sskip(&cp); 1387 if (strcmp(arg, "stream") == 0) 1388 sep->se_socktype = SOCK_STREAM; 1389 else if (strcmp(arg, "dgram") == 0) 1390 sep->se_socktype = SOCK_DGRAM; 1391 else if (strcmp(arg, "rdm") == 0) 1392 sep->se_socktype = SOCK_RDM; 1393 else if (strcmp(arg, "seqpacket") == 0) 1394 sep->se_socktype = SOCK_SEQPACKET; 1395 else if (strcmp(arg, "raw") == 0) 1396 sep->se_socktype = SOCK_RAW; 1397 else 1398 sep->se_socktype = -1; 1399 1400 arg = sskip(&cp); 1401 if (sep->se_type == NORM_TYPE && 1402 strncmp(arg, "faith/", strlen("faith/")) == 0) { 1403 arg += strlen("faith/"); 1404 sep->se_type = FAITH_TYPE; 1405 } 1406 sep->se_proto = newstr(arg); 1407 1408 #define MALFORMED(arg) \ 1409 do { \ 1410 syslog(LOG_ERR, "%s: malformed buffer size option `%s'", \ 1411 sep->se_service, (arg)); \ 1412 goto more; \ 1413 } while (0) 1414 1415 #define GETVAL(arg) \ 1416 do { \ 1417 if (!isdigit(*(arg))) \ 1418 MALFORMED(arg); \ 1419 val = strtol((arg), &cp0, 10); \ 1420 if (cp0 != NULL) { \ 1421 if (cp0[1] != '\0') \ 1422 MALFORMED((arg)); \ 1423 if (cp0[0] == 'k') \ 1424 val *= 1024; \ 1425 if (cp0[0] == 'm') \ 1426 val *= 1024 * 1024; \ 1427 } \ 1428 if (val < 1) { \ 1429 syslog(LOG_ERR, "%s: invalid buffer size `%s'", \ 1430 sep->se_service, (arg)); \ 1431 goto more; \ 1432 } \ 1433 } while (0) 1434 1435 #define ASSIGN(arg) \ 1436 do { \ 1437 if (strcmp((arg), "sndbuf") == 0) \ 1438 sep->se_sndbuf = val; \ 1439 else if (strcmp((arg), "rcvbuf") == 0) \ 1440 sep->se_rcvbuf = val; \ 1441 else \ 1442 MALFORMED((arg)); \ 1443 } while (0) 1444 1445 /* 1446 * Extract the send and receive buffer sizes before parsing 1447 * the protocol. 1448 */ 1449 sep->se_sndbuf = sep->se_rcvbuf = 0; 1450 buf0 = buf1 = sz0 = sz1 = NULL; 1451 if ((buf0 = strchr(sep->se_proto, ',')) != NULL) { 1452 /* Not meaningful for Tcpmux services. */ 1453 if (ISMUX(sep)) { 1454 syslog(LOG_ERR, "%s: can't specify buffer sizes for " 1455 "tcpmux services", sep->se_service); 1456 goto more; 1457 } 1458 1459 /* Skip the , */ 1460 *buf0++ = '\0'; 1461 1462 /* Check to see if another socket buffer size was specified. */ 1463 if ((buf1 = strchr(buf0, ',')) != NULL) { 1464 /* Skip the , */ 1465 *buf1++ = '\0'; 1466 1467 /* Make sure a 3rd one wasn't specified. */ 1468 if (strchr(buf1, ',') != NULL) { 1469 syslog(LOG_ERR, "%s: too many buffer sizes", 1470 sep->se_service); 1471 goto more; 1472 } 1473 1474 /* Locate the size. */ 1475 if ((sz1 = strchr(buf1, '=')) == NULL) 1476 MALFORMED(buf1); 1477 1478 /* Skip the = */ 1479 *sz1++ = '\0'; 1480 } 1481 1482 /* Locate the size. */ 1483 if ((sz0 = strchr(buf0, '=')) == NULL) 1484 MALFORMED(buf0); 1485 1486 /* Skip the = */ 1487 *sz0++ = '\0'; 1488 1489 GETVAL(sz0); 1490 ASSIGN(buf0); 1491 1492 if (buf1 != NULL) { 1493 GETVAL(sz1); 1494 ASSIGN(buf1); 1495 } 1496 } 1497 1498 #undef ASSIGN 1499 #undef GETVAL 1500 #undef MALFORMED 1501 1502 if (strcmp(sep->se_proto, "unix") == 0) { 1503 sep->se_family = AF_LOCAL; 1504 } else { 1505 val = strlen(sep->se_proto); 1506 if (!val) { 1507 syslog(LOG_ERR, "%s: invalid protocol specified", 1508 sep->se_service); 1509 goto more; 1510 } 1511 val = sep->se_proto[val - 1]; 1512 switch (val) { 1513 case '4': /*tcp4 or udp4*/ 1514 sep->se_family = AF_INET; 1515 break; 1516 #ifdef INET6 1517 case '6': /*tcp6 or udp6*/ 1518 sep->se_family = AF_INET6; 1519 break; 1520 #endif 1521 default: 1522 sep->se_family = AF_INET; /*will become AF_INET6*/ 1523 break; 1524 } 1525 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1526 #ifdef RPC 1527 char *cp, *ccp; 1528 cp = strchr(sep->se_service, '/'); 1529 if (cp == 0) { 1530 syslog(LOG_ERR, "%s: no rpc version", 1531 sep->se_service); 1532 goto more; 1533 } 1534 *cp++ = '\0'; 1535 sep->se_rpcversl = sep->se_rpcversh = 1536 strtol(cp, &ccp, 0); 1537 if (ccp == cp) { 1538 badafterall: 1539 syslog(LOG_ERR, "%s/%s: bad rpc version", 1540 sep->se_service, cp); 1541 goto more; 1542 } 1543 if (*ccp == '-') { 1544 cp = ccp + 1; 1545 sep->se_rpcversh = strtol(cp, &ccp, 0); 1546 if (ccp == cp) 1547 goto badafterall; 1548 } 1549 #else 1550 syslog(LOG_ERR, "%s: rpc services not suported", 1551 sep->se_service); 1552 goto more; 1553 #endif /* RPC */ 1554 } 1555 } 1556 arg = sskip(&cp); 1557 { 1558 char *cp; 1559 if ((cp = strchr(arg, ':')) == NULL) 1560 cp = strchr(arg, '.'); 1561 if (cp != NULL) { 1562 *cp++ = '\0'; 1563 sep->se_max = atoi(cp); 1564 } else 1565 sep->se_max = TOOMANY; 1566 } 1567 sep->se_wait = strcmp(arg, "wait") == 0; 1568 if (ISMUX(sep)) { 1569 /* 1570 * Silently enforce "nowait" for TCPMUX services since 1571 * they don't have an assigned port to listen on. 1572 */ 1573 sep->se_wait = 0; 1574 1575 if (strncmp(sep->se_proto, "tcp", 3)) { 1576 syslog(LOG_ERR, 1577 "%s: bad protocol for tcpmux service %s", 1578 CONFIG, sep->se_service); 1579 goto more; 1580 } 1581 if (sep->se_socktype != SOCK_STREAM) { 1582 syslog(LOG_ERR, 1583 "%s: bad socket type for tcpmux service %s", 1584 CONFIG, sep->se_service); 1585 goto more; 1586 } 1587 } 1588 sep->se_user = newstr(sskip(&cp)); 1589 if ((sep->se_group = strchr(sep->se_user, ':')) != NULL) 1590 *sep->se_group++ = '\0'; 1591 else if ((sep->se_group = strchr(sep->se_user, '.')) != NULL) 1592 *sep->se_group++ = '\0'; 1593 1594 sep->se_server = newstr(sskip(&cp)); 1595 if (strcmp(sep->se_server, "internal") == 0) { 1596 struct biltin *bi; 1597 1598 for (bi = biltins; bi->bi_service; bi++) 1599 if (bi->bi_socktype == sep->se_socktype && 1600 strcmp(bi->bi_service, sep->se_service) == 0) 1601 break; 1602 if (bi->bi_service == 0) { 1603 syslog(LOG_ERR, "internal service %s unknown", 1604 sep->se_service); 1605 goto more; 1606 } 1607 sep->se_bi = bi; 1608 sep->se_wait = bi->bi_wait; 1609 } else 1610 sep->se_bi = NULL; 1611 argc = 0; 1612 for (arg = skip(&cp); cp; arg = skip(&cp)) { 1613 #if MULOG 1614 char *colon; 1615 1616 if (argc == 0 && (colon = strrchr(arg, ':'))) { 1617 while (arg < colon) { 1618 int x; 1619 char *ccp; 1620 1621 switch (*arg++) { 1622 case 'l': 1623 x = 1; 1624 if (isdigit(*arg)) { 1625 x = strtol(arg, &ccp, 0); 1626 if (ccp == arg) 1627 break; 1628 arg = ccp; 1629 } 1630 sep->se_log &= ~MULOG_RFC931; 1631 sep->se_log |= x; 1632 break; 1633 case 'a': 1634 sep->se_log |= MULOG_RFC931; 1635 break; 1636 default: 1637 break; 1638 } 1639 } 1640 arg = colon + 1; 1641 } 1642 #endif 1643 if (argc < MAXARGV) 1644 sep->se_argv[argc++] = newstr(arg); 1645 } 1646 while (argc <= MAXARGV) 1647 sep->se_argv[argc++] = NULL; 1648 #ifdef IPSEC 1649 sep->se_policy = policy ? newstr(policy) : NULL; 1650 #endif 1651 return (sep); 1652 } 1653 1654 void 1655 freeconfig(cp) 1656 struct servtab *cp; 1657 { 1658 int i; 1659 1660 if (cp->se_hostaddr) 1661 free(cp->se_hostaddr); 1662 if (cp->se_service) 1663 free(cp->se_service); 1664 if (cp->se_proto) 1665 free(cp->se_proto); 1666 if (cp->se_user) 1667 free(cp->se_user); 1668 /* Note: se_group is part of the newstr'ed se_user */ 1669 if (cp->se_server) 1670 free(cp->se_server); 1671 for (i = 0; i < MAXARGV; i++) 1672 if (cp->se_argv[i]) 1673 free(cp->se_argv[i]); 1674 #ifdef IPSEC 1675 if (cp->se_policy) 1676 free(cp->se_policy); 1677 #endif 1678 } 1679 1680 1681 /* 1682 * Safe skip - if skip returns null, log a syntax error in the 1683 * configuration file and exit. 1684 */ 1685 char * 1686 sskip(cpp) 1687 char **cpp; 1688 { 1689 char *cp; 1690 1691 cp = skip(cpp); 1692 if (cp == NULL) { 1693 syslog(LOG_ERR, "%s: syntax error", CONFIG); 1694 exit(-1); 1695 } 1696 return (cp); 1697 } 1698 1699 char * 1700 skip(cpp) 1701 char **cpp; 1702 { 1703 char *cp = *cpp; 1704 char *start; 1705 1706 if (*cpp == NULL) 1707 return ((char *)0); 1708 1709 again: 1710 while (*cp == ' ' || *cp == '\t') 1711 cp++; 1712 if (*cp == '\0') { 1713 int c; 1714 1715 c = getc(fconfig); 1716 (void) ungetc(c, fconfig); 1717 if (c == ' ' || c == '\t') 1718 if ((cp = nextline(fconfig))) 1719 goto again; 1720 *cpp = (char *)0; 1721 return ((char *)0); 1722 } 1723 start = cp; 1724 while (*cp && *cp != ' ' && *cp != '\t') 1725 cp++; 1726 if (*cp != '\0') 1727 *cp++ = '\0'; 1728 *cpp = cp; 1729 return (start); 1730 } 1731 1732 char * 1733 nextline(fd) 1734 FILE *fd; 1735 { 1736 char *cp; 1737 1738 if (fgets(line, sizeof (line), fd) == NULL) 1739 return ((char *)0); 1740 cp = strchr(line, '\n'); 1741 if (cp) 1742 *cp = '\0'; 1743 return (line); 1744 } 1745 1746 char * 1747 newstr(cp) 1748 char *cp; 1749 { 1750 if ((cp = strdup(cp ? cp : ""))) 1751 return (cp); 1752 syslog(LOG_ERR, "strdup: %m"); 1753 exit(-1); 1754 } 1755 1756 void 1757 inetd_setproctitle(a, s) 1758 char *a; 1759 int s; 1760 { 1761 int size; 1762 char *cp; 1763 struct sockaddr_storage ss; 1764 char buf[80]; 1765 char hbuf[NI_MAXHOST]; 1766 1767 cp = Argv[0]; 1768 size = sizeof(ss); 1769 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) { 1770 if (getnameinfo((struct sockaddr *)&ss, ss.ss_len, 1771 hbuf, sizeof(hbuf), NULL, 0, niflags) != 0) 1772 strcpy(hbuf, "?"); 1773 (void)snprintf(buf, sizeof buf, "-%s [%s]", a, hbuf); 1774 } else 1775 (void)snprintf(buf, sizeof buf, "-%s", a); 1776 strncpy(cp, buf, LastArg - cp); 1777 cp += strlen(cp); 1778 while (cp < LastArg) 1779 *cp++ = ' '; 1780 } 1781 1782 void 1783 bump_nofile() 1784 { 1785 #ifdef RLIMIT_NOFILE 1786 1787 #define FD_CHUNK 32 1788 1789 struct rlimit rl; 1790 1791 if (getrlimit(RLIMIT_NOFILE, &rl) < 0) { 1792 syslog(LOG_ERR, "getrlimit: %m"); 1793 return; 1794 } 1795 rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK); 1796 if (rl.rlim_cur <= rlim_ofile_cur) { 1797 syslog(LOG_ERR, 1798 "bump_nofile: cannot extend file limit, max = %d", 1799 (int)rl.rlim_cur); 1800 return; 1801 } 1802 1803 if (setrlimit(RLIMIT_NOFILE, &rl) < 0) { 1804 syslog(LOG_ERR, "setrlimit: %m"); 1805 return; 1806 } 1807 1808 rlim_ofile_cur = rl.rlim_cur; 1809 return; 1810 1811 #else 1812 syslog(LOG_ERR, "bump_nofile: cannot extend file limit"); 1813 return; 1814 #endif 1815 } 1816 1817 /* 1818 * Internet services provided internally by inetd: 1819 */ 1820 #define BUFSIZE 4096 1821 1822 /* ARGSUSED */ 1823 void 1824 echo_stream(s, sep) /* Echo service -- echo data back */ 1825 int s; 1826 struct servtab *sep; 1827 { 1828 char buffer[BUFSIZE]; 1829 int i; 1830 1831 inetd_setproctitle(sep->se_service, s); 1832 while ((i = read(s, buffer, sizeof(buffer))) > 0 && 1833 write(s, buffer, i) > 0) 1834 ; 1835 } 1836 1837 /* ARGSUSED */ 1838 void 1839 echo_dg(s, sep) /* Echo service -- echo data back */ 1840 int s; 1841 struct servtab *sep; 1842 { 1843 char buffer[BUFSIZE]; 1844 int i, size; 1845 struct sockaddr_storage ss; 1846 struct sockaddr *sa; 1847 1848 sa = (struct sockaddr *)&ss; 1849 size = sizeof(ss); 1850 if ((i = recvfrom(s, buffer, sizeof(buffer), 0, sa, &size)) < 0) 1851 return; 1852 if (port_good_dg(sa)) 1853 (void) sendto(s, buffer, i, 0, sa, size); 1854 } 1855 1856 /* ARGSUSED */ 1857 void 1858 discard_stream(s, sep) /* Discard service -- ignore data */ 1859 int s; 1860 struct servtab *sep; 1861 { 1862 char buffer[BUFSIZE]; 1863 1864 inetd_setproctitle(sep->se_service, s); 1865 while ((errno = 0, read(s, buffer, sizeof(buffer)) > 0) || 1866 errno == EINTR) 1867 ; 1868 } 1869 1870 /* ARGSUSED */ 1871 void 1872 discard_dg(s, sep) /* Discard service -- ignore data */ 1873 int s; 1874 struct servtab *sep; 1875 { 1876 char buffer[BUFSIZE]; 1877 1878 (void) read(s, buffer, sizeof(buffer)); 1879 } 1880 1881 #include <ctype.h> 1882 #define LINESIZ 72 1883 char ring[128]; 1884 char *endring; 1885 1886 void 1887 initring() 1888 { 1889 int i; 1890 1891 endring = ring; 1892 1893 for (i = 0; i <= 128; ++i) 1894 if (isprint(i)) 1895 *endring++ = i; 1896 } 1897 1898 /* ARGSUSED */ 1899 void 1900 chargen_stream(s, sep) /* Character generator */ 1901 int s; 1902 struct servtab *sep; 1903 { 1904 int len; 1905 char *rs, text[LINESIZ+2]; 1906 1907 inetd_setproctitle(sep->se_service, s); 1908 1909 if (!endring) { 1910 initring(); 1911 rs = ring; 1912 } 1913 1914 text[LINESIZ] = '\r'; 1915 text[LINESIZ + 1] = '\n'; 1916 for (rs = ring;;) { 1917 if ((len = endring - rs) >= LINESIZ) 1918 memmove(text, rs, LINESIZ); 1919 else { 1920 memmove(text, rs, len); 1921 memmove(text + len, ring, LINESIZ - len); 1922 } 1923 if (++rs == endring) 1924 rs = ring; 1925 if (write(s, text, sizeof(text)) != sizeof(text)) 1926 break; 1927 } 1928 } 1929 1930 /* ARGSUSED */ 1931 void 1932 chargen_dg(s, sep) /* Character generator */ 1933 int s; 1934 struct servtab *sep; 1935 { 1936 struct sockaddr_storage ss; 1937 struct sockaddr *sa; 1938 static char *rs; 1939 int len, size; 1940 char text[LINESIZ+2]; 1941 1942 if (endring == 0) { 1943 initring(); 1944 rs = ring; 1945 } 1946 1947 sa = (struct sockaddr *)&ss; 1948 size = sizeof(ss); 1949 if (recvfrom(s, text, sizeof(text), 0, sa, &size) < 0) 1950 return; 1951 1952 if (!port_good_dg(sa)) 1953 return; 1954 1955 if ((len = endring - rs) >= LINESIZ) 1956 memmove(text, rs, LINESIZ); 1957 else { 1958 memmove(text, rs, len); 1959 memmove(text + len, ring, LINESIZ - len); 1960 } 1961 if (++rs == endring) 1962 rs = ring; 1963 text[LINESIZ] = '\r'; 1964 text[LINESIZ + 1] = '\n'; 1965 (void) sendto(s, text, sizeof(text), 0, sa, size); 1966 } 1967 1968 /* 1969 * Return a machine readable date and time, in the form of the 1970 * number of seconds since midnight, Jan 1, 1900. Since gettimeofday 1971 * returns the number of seconds since midnight, Jan 1, 1970, 1972 * we must add 2208988800 seconds to this figure to make up for 1973 * some seventy years Bell Labs was asleep. 1974 */ 1975 1976 long 1977 machtime() 1978 { 1979 struct timeval tv; 1980 1981 if (gettimeofday(&tv, (struct timezone *)0) < 0) { 1982 if (debug) 1983 fprintf(stderr, "Unable to get time of day\n"); 1984 return (0L); 1985 } 1986 #define OFFSET ((u_long)25567 * 24*60*60) 1987 return (htonl((long)(tv.tv_sec + OFFSET))); 1988 #undef OFFSET 1989 } 1990 1991 /* ARGSUSED */ 1992 void 1993 machtime_stream(s, sep) 1994 int s; 1995 struct servtab *sep; 1996 { 1997 long result; 1998 1999 result = machtime(); 2000 (void) write(s, (char *) &result, sizeof(result)); 2001 } 2002 2003 /* ARGSUSED */ 2004 void 2005 machtime_dg(s, sep) 2006 int s; 2007 struct servtab *sep; 2008 { 2009 long result; 2010 struct sockaddr_storage ss; 2011 struct sockaddr *sa; 2012 int size; 2013 2014 sa = (struct sockaddr *)&ss; 2015 size = sizeof(ss); 2016 if (recvfrom(s, (char *)&result, sizeof(result), 0, sa, &size) < 0) 2017 return; 2018 if (!port_good_dg(sa)) 2019 return; 2020 result = machtime(); 2021 (void) sendto(s, (char *) &result, sizeof(result), 0, sa, size); 2022 } 2023 2024 /* ARGSUSED */ 2025 void 2026 daytime_stream(s, sep) /* Return human-readable time of day */ 2027 int s; 2028 struct servtab *sep; 2029 { 2030 char buffer[256]; 2031 time_t clock; 2032 int len; 2033 2034 clock = time((time_t *) 0); 2035 2036 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 2037 (void) write(s, buffer, len); 2038 } 2039 2040 /* ARGSUSED */ 2041 void 2042 daytime_dg(s, sep) /* Return human-readable time of day */ 2043 int s; 2044 struct servtab *sep; 2045 { 2046 char buffer[256]; 2047 time_t clock; 2048 struct sockaddr_storage ss; 2049 struct sockaddr *sa; 2050 int size, len; 2051 2052 clock = time((time_t *) 0); 2053 2054 sa = (struct sockaddr *)&ss; 2055 size = sizeof(ss); 2056 if (recvfrom(s, buffer, sizeof(buffer), 0, sa, &size) < 0) 2057 return; 2058 if (!port_good_dg(sa)) 2059 return; 2060 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 2061 (void) sendto(s, buffer, len, 0, sa, size); 2062 } 2063 2064 /* 2065 * print_service: 2066 * Dump relevant information to stderr 2067 */ 2068 void 2069 print_service(action, sep) 2070 char *action; 2071 struct servtab *sep; 2072 { 2073 if (isrpcservice(sep)) 2074 fprintf(stderr, 2075 "%s: %s rpcprog=%d, rpcvers = %d/%d, proto=%s, wait:max=%d.%d, user:group=%s.%s builtin=%lx server=%s" 2076 #ifdef IPSEC 2077 " policy=\"%s\"" 2078 #endif 2079 "\n", 2080 action, sep->se_service, 2081 sep->se_rpcprog, sep->se_rpcversh, sep->se_rpcversl, sep->se_proto, 2082 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 2083 (long)sep->se_bi, sep->se_server 2084 #ifdef IPSEC 2085 , (sep->se_policy ? sep->se_policy : "") 2086 #endif 2087 ); 2088 else 2089 fprintf(stderr, 2090 "%s: %s proto=%s%s, wait:max=%d.%d, user:group=%s.%s builtin=%lx server=%s" 2091 #ifdef IPSEC 2092 " policy=%s" 2093 #endif 2094 "\n", 2095 action, sep->se_service, 2096 sep->se_type == FAITH_TYPE ? "faith/" : "", 2097 sep->se_proto, 2098 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 2099 (long)sep->se_bi, sep->se_server 2100 #ifdef IPSEC 2101 , (sep->se_policy ? sep->se_policy : "") 2102 #endif 2103 ); 2104 } 2105 2106 void 2107 usage() 2108 { 2109 2110 #ifdef LIBWRAP 2111 (void)fprintf(stderr, "usage: %s [-dl] [conf]\n", __progname); 2112 #else 2113 (void)fprintf(stderr, "usage: %s [-d] [conf]\n", __progname); 2114 #endif 2115 exit(1); 2116 } 2117 2118 2119 /* 2120 * Based on TCPMUX.C by Mark K. Lottor November 1988 2121 * sri-nic::ps:<mkl>tcpmux.c 2122 */ 2123 2124 static int /* # of characters upto \r,\n or \0 */ 2125 getline(fd, buf, len) 2126 int fd; 2127 char *buf; 2128 int len; 2129 { 2130 int count = 0, n; 2131 2132 do { 2133 n = read(fd, buf, len-count); 2134 if (n == 0) 2135 return (count); 2136 if (n < 0) 2137 return (-1); 2138 while (--n >= 0) { 2139 if (*buf == '\r' || *buf == '\n' || *buf == '\0') 2140 return (count); 2141 count++; 2142 buf++; 2143 } 2144 } while (count < len); 2145 return (count); 2146 } 2147 2148 #define MAX_SERV_LEN (256+2) /* 2 bytes for \r\n */ 2149 2150 #define strwrite(fd, buf) (void) write(fd, buf, sizeof(buf)-1) 2151 2152 void 2153 tcpmux(ctrl, sep) 2154 int ctrl; 2155 struct servtab *sep; 2156 { 2157 char service[MAX_SERV_LEN+1]; 2158 int len; 2159 2160 /* Get requested service name */ 2161 if ((len = getline(ctrl, service, MAX_SERV_LEN)) < 0) { 2162 strwrite(ctrl, "-Error reading service name\r\n"); 2163 goto reject; 2164 } 2165 service[len] = '\0'; 2166 2167 if (debug) 2168 fprintf(stderr, "tcpmux: someone wants %s\n", service); 2169 2170 /* 2171 * Help is a required command, and lists available services, 2172 * one per line. 2173 */ 2174 if (!strcasecmp(service, "help")) { 2175 strwrite(ctrl, "+Available services:\r\n"); 2176 strwrite(ctrl, "help\r\n"); 2177 for (sep = servtab; sep; sep = sep->se_next) { 2178 if (!ISMUX(sep)) 2179 continue; 2180 (void)write(ctrl, sep->se_service, 2181 strlen(sep->se_service)); 2182 strwrite(ctrl, "\r\n"); 2183 } 2184 goto reject; 2185 } 2186 2187 /* Try matching a service in inetd.conf with the request */ 2188 for (sep = servtab; sep; sep = sep->se_next) { 2189 if (!ISMUX(sep)) 2190 continue; 2191 if (!strcasecmp(service, sep->se_service)) { 2192 if (ISMUXPLUS(sep)) 2193 strwrite(ctrl, "+Go\r\n"); 2194 run_service(ctrl, sep); 2195 return; 2196 } 2197 } 2198 strwrite(ctrl, "-Service not available\r\n"); 2199 reject: 2200 _exit(1); 2201 } 2202 2203 2204 #ifdef MULOG 2205 dolog(sep, ctrl) 2206 struct servtab *sep; 2207 int ctrl; 2208 { 2209 struct sockaddr_storage ss; 2210 struct sockaddr *sa = (struct sockaddr *)&ss; 2211 struct sockaddr_in *sin = (struct sockaddr_in *)&ss; 2212 int len = sizeof(ss); 2213 struct hostent *hp; 2214 char *host, *dp, buf[BUFSIZ], *rfc931_name(); 2215 int connected = 1; 2216 2217 switch (sep->se_family) { 2218 case AF_INET: 2219 #ifdef INET6 2220 case AF_INET6: 2221 #endif 2222 break; 2223 default; 2224 return; 2225 } 2226 2227 if (getpeername(ctrl, sa, &len) < 0) { 2228 if (errno != ENOTCONN) { 2229 syslog(LOG_ERR, "getpeername: %m"); 2230 return; 2231 } 2232 if (recvfrom(ctrl, buf, sizeof(buf), MSG_PEEK, sa, &len) < 0) { 2233 syslog(LOG_ERR, "recvfrom: %m"); 2234 return; 2235 } 2236 connected = 0; 2237 } 2238 switch (sa->sa_family) { 2239 case AF_INET: 2240 #ifdef INET6 2241 case AF_INET6: 2242 #endif 2243 break; 2244 default; 2245 syslog(LOG_ERR, "unexpected address family %u", sa->sa_family); 2246 return; 2247 } 2248 2249 if (getnameinfo(sa, sa->sa_len, buf, sizeof(buf), NULL, 0, 0) != 0) 2250 strcpy(buf, "?"); 2251 host = buf; 2252 2253 switch (sep->se_log & ~MULOG_RFC931) { 2254 case 0: 2255 return; 2256 case 1: 2257 if (curdom == NULL || *curdom == '\0') 2258 break; 2259 dp = host + strlen(host) - strlen(curdom); 2260 if (dp < host) 2261 break; 2262 if (debug) 2263 fprintf(stderr, "check \"%s\" against curdom \"%s\"\n", 2264 host, curdom); 2265 if (strcasecmp(dp, curdom) == 0) 2266 return; 2267 break; 2268 case 2: 2269 default: 2270 break; 2271 } 2272 2273 openlog("", LOG_NOWAIT, MULOG); 2274 2275 if (connected && (sep->se_log & MULOG_RFC931)) 2276 syslog(LOG_INFO, "%s@%s wants %s", 2277 rfc931_name(sa, ctrl), host, sep->se_service); 2278 else 2279 syslog(LOG_INFO, "%s wants %s", 2280 host, sep->se_service); 2281 } 2282 2283 /* 2284 * From tcp_log by 2285 * Wietse Venema, Eindhoven University of Technology, The Netherlands. 2286 */ 2287 #if 0 2288 static char sccsid[] = "@(#) rfc931.c 1.3 92/08/31 22:54:46"; 2289 #endif 2290 2291 #include <setjmp.h> 2292 2293 #define RFC931_PORT 113 /* Semi-well-known port */ 2294 #define TIMEOUT 4 2295 #define TIMEOUT2 10 2296 2297 static jmp_buf timebuf; 2298 2299 /* timeout - handle timeouts */ 2300 2301 static void timeout(sig) 2302 int sig; 2303 { 2304 longjmp(timebuf, sig); 2305 } 2306 2307 /* rfc931_name - return remote user name */ 2308 2309 char * 2310 rfc931_name(there, ctrl) 2311 struct sockaddr *there; /* remote link information */ 2312 int ctrl; 2313 { 2314 struct sockaddr_storage here; /* local link information */ 2315 struct sockaddr_storage sin; /* for talking to RFC931 daemon */ 2316 int length; 2317 int s; 2318 unsigned remote; 2319 unsigned local; 2320 static char user[256]; /* XXX */ 2321 char buf[256]; 2322 char *cp; 2323 char *result = "USER_UNKNOWN"; 2324 int len; 2325 u_int16_t myport, hisport; 2326 2327 /* Find out local port number of our stdin. */ 2328 2329 length = sizeof(here); 2330 if (getsockname(ctrl, (struct sockaddr *) &here, &length) == -1) { 2331 syslog(LOG_ERR, "getsockname: %m"); 2332 return (result); 2333 } 2334 switch (here.ss_family) { 2335 case AF_INET: 2336 myport = ((struct sockaddr_in *)&here)->sin_port; 2337 break; 2338 #ifdef INET6 2339 case AF_INET6: 2340 myport = ((struct sockaddr_in6 *)&here)->sin6_port; 2341 break; 2342 #endif 2343 } 2344 switch (there->sa_family) { 2345 case AF_INET: 2346 hisport = ((struct sockaddr_in *)sa)->sin_port; 2347 break; 2348 #ifdef INET6 2349 case AF_INET6: 2350 hisport = ((struct sockaddr_in6 *)sa)->sin6_port; 2351 break; 2352 #endif 2353 } 2354 /* Set up timer so we won't get stuck. */ 2355 2356 if ((s = socket(here.ss_family, SOCK_STREAM, 0)) == -1) { 2357 syslog(LOG_ERR, "socket: %m"); 2358 return (result); 2359 } 2360 2361 sin = here; 2362 switch (sin.ss_family) { 2363 case AF_INET: 2364 ((struct sockaddr_in *)&sin)->sin_port = htons(0); 2365 break; 2366 #ifdef INET6 2367 case AF_INET6: 2368 ((struct sockaddr_in6 *)&sin)->sin6_port = htons(0); 2369 break; 2370 #endif 2371 } 2372 if (bind(s, (struct sockaddr *) &sin, sin.ss_len) == -1) { 2373 syslog(LOG_ERR, "bind: %m"); 2374 return (result); 2375 } 2376 2377 signal(SIGALRM, timeout); 2378 if (setjmp(timebuf)) { 2379 close(s); /* not: fclose(fp) */ 2380 return (result); 2381 } 2382 alarm(TIMEOUT); 2383 2384 /* Connect to the RFC931 daemon. */ 2385 2386 memcpy(&sin, there, there->sa_len); 2387 switch (sin.ss_family) { 2388 case AF_INET: 2389 ((struct sockaddr_in *)&sin)->sin_port = htons(RFC931_PORT); 2390 break; 2391 #ifdef INET6 2392 case AF_INET6: 2393 ((struct sockaddr_in6 *)&sin)->sin6_port = htons(RFC931_PORT); 2394 break; 2395 #endif 2396 } 2397 if (connect(s, (struct sockaddr *) &sin, sin.ss_len) == -1) { 2398 close(s); 2399 alarm(0); 2400 return (result); 2401 } 2402 2403 /* Query the RFC 931 server. Would 13-byte writes ever be broken up? */ 2404 (void)snprintf(buf, sizeof buf, "%u,%u\r\n", ntohs(hisport), 2405 ntohs(myport)); 2406 2407 2408 for (len = 0, cp = buf; len < strlen(buf); ) { 2409 int n; 2410 2411 if ((n = write(s, cp, strlen(buf) - len)) == -1) { 2412 close(s); 2413 alarm(0); 2414 return (result); 2415 } 2416 cp += n; 2417 len += n; 2418 } 2419 2420 /* Read response */ 2421 for (cp = buf; cp < buf + sizeof(buf) - 1; ) { 2422 char c; 2423 if (read(s, &c, 1) != 1) { 2424 close(s); 2425 alarm(0); 2426 return (result); 2427 } 2428 if (c == '\n') 2429 break; 2430 *cp++ = c; 2431 } 2432 *cp = '\0'; 2433 2434 if (sscanf(buf, "%u , %u : USERID :%*[^:]:%255s", &remote, &local, user) == 3 2435 && ntohs(hisport) == remote 2436 && ntohs(myport) == local) { 2437 2438 /* Strip trailing carriage return. */ 2439 if (cp = strchr(user, '\r')) 2440 *cp = 0; 2441 result = user; 2442 } 2443 2444 alarm(0); 2445 close(s); 2446 return (result); 2447 } 2448 #endif 2449 2450 /* 2451 * check if the port where send data to is one of the obvious ports 2452 * that are used for denial of service attacks like two echo ports 2453 * just echoing data between them 2454 */ 2455 int 2456 port_good_dg(sa) 2457 struct sockaddr *sa; 2458 { 2459 u_int16_t port; 2460 int i, bad; 2461 char hbuf[NI_MAXHOST]; 2462 2463 bad = 0; 2464 2465 switch (sa->sa_family) { 2466 case AF_INET: 2467 port = ntohs(((struct sockaddr_in *)sa)->sin_port); 2468 break; 2469 #ifdef INET6 2470 case AF_INET6: 2471 port = ntohs(((struct sockaddr_in6 *)sa)->sin6_port); 2472 break; 2473 #endif 2474 default: 2475 /* XXX unsupported af, is it safe to assume it to be safe? */ 2476 return 1; 2477 } 2478 2479 for (i = 0; bad_ports[i] != 0; i++) 2480 if (port == bad_ports[i]) { 2481 bad = 1; 2482 break; 2483 } 2484 2485 if (bad) { 2486 if (getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), 2487 NULL, 0, niflags) != 0) 2488 strcpy(hbuf, "?"); 2489 syslog(LOG_WARNING,"Possible DoS attack from %s, Port %d", 2490 hbuf, port); 2491 return (0); 2492 } else 2493 return (1); 2494 } 2495 2496