inetd.c revision 1.79
1 /* $NetBSD: inetd.c,v 1.79 2002/06/01 00:28:52 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 1.79 2002/06/01 00:28:52 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 rlim_t 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 uint32_t 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 *[])); 390 void spawn __P((struct servtab *, int)); 391 #ifdef MULOG 392 void dolog __P((struct servtab *, int)); 393 static void timeout __P((int)); 394 char *rfc931_name __P((struct sockaddr *, int)); 395 #endif 396 397 struct biltin { 398 char *bi_service; /* internally provided service name */ 399 int bi_socktype; /* type of socket supported */ 400 short bi_fork; /* 1 if should fork before call */ 401 short bi_wait; /* 1 if should wait for child */ 402 void (*bi_fn) __P((int, struct servtab *)); 403 /* function which performs it */ 404 } biltins[] = { 405 /* Echo received data */ 406 { "echo", SOCK_STREAM, 1, 0, echo_stream }, 407 { "echo", SOCK_DGRAM, 0, 0, echo_dg }, 408 409 /* Internet /dev/null */ 410 { "discard", SOCK_STREAM, 1, 0, discard_stream }, 411 { "discard", SOCK_DGRAM, 0, 0, discard_dg }, 412 413 /* Return 32 bit time since 1970 */ 414 { "time", SOCK_STREAM, 0, 0, machtime_stream }, 415 { "time", SOCK_DGRAM, 0, 0, machtime_dg }, 416 417 /* Return human-readable time */ 418 { "daytime", SOCK_STREAM, 0, 0, daytime_stream }, 419 { "daytime", SOCK_DGRAM, 0, 0, daytime_dg }, 420 421 /* Familiar character generator */ 422 { "chargen", SOCK_STREAM, 1, 0, chargen_stream }, 423 { "chargen", SOCK_DGRAM, 0, 0, chargen_dg }, 424 425 { "tcpmux", SOCK_STREAM, 1, 0, tcpmux }, 426 427 { NULL } 428 }; 429 430 /* list of "bad" ports. I.e. ports that are most obviously used for 431 * "cycling packets" denial of service attacks. See /etc/services. 432 * List must end with port number "0". 433 */ 434 435 u_int16_t bad_ports[] = { 7, 9, 13, 19, 37, 0 }; 436 437 438 #define NUMINT (sizeof(intab) / sizeof(struct inent)) 439 char *CONFIG = _PATH_INETDCONF; 440 441 int 442 main(argc, argv) 443 int argc; 444 char *argv[]; 445 { 446 struct servtab *sep, *nsep; 447 struct sigvec sv; 448 int ch; 449 450 while ((ch = getopt(argc, argv, 451 #ifdef LIBWRAP 452 "dl" 453 #else 454 "d" 455 #endif 456 )) != -1) 457 switch(ch) { 458 case 'd': 459 debug = 1; 460 options |= SO_DEBUG; 461 break; 462 #ifdef LIBWRAP 463 case 'l': 464 lflag = 1; 465 break; 466 #endif 467 case '?': 468 default: 469 usage(); 470 } 471 argc -= optind; 472 argv += optind; 473 474 if (argc > 0) 475 CONFIG = argv[0]; 476 477 if (debug == 0) 478 daemon(0, 0); 479 openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON); 480 pidfile(NULL); 481 482 #ifdef RLIMIT_NOFILE 483 if (getrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) { 484 syslog(LOG_ERR, "getrlimit: %m"); 485 } else { 486 rlim_ofile_cur = rlim_ofile.rlim_cur; 487 if (rlim_ofile_cur == RLIM_INFINITY) /* ! */ 488 rlim_ofile_cur = OPEN_MAX; 489 } 490 #endif 491 492 memset(&sv, 0, sizeof(sv)); 493 sv.sv_mask = SIGBLOCK; 494 sv.sv_handler = retry; 495 sigvec(SIGALRM, &sv, (struct sigvec *)0); 496 config(SIGHUP); 497 sv.sv_handler = config; 498 sigvec(SIGHUP, &sv, (struct sigvec *)0); 499 sv.sv_handler = reapchild; 500 sigvec(SIGCHLD, &sv, (struct sigvec *)0); 501 sv.sv_handler = goaway; 502 sigvec(SIGTERM, &sv, (struct sigvec *)0); 503 sv.sv_handler = goaway; 504 sigvec(SIGINT, &sv, (struct sigvec *)0); 505 sv.sv_mask = 0L; 506 sv.sv_handler = SIG_IGN; 507 sigvec(SIGPIPE, &sv, (struct sigvec *)0); 508 509 { 510 /* space for daemons to overwrite environment for ps */ 511 #define DUMMYSIZE 100 512 char dummy[DUMMYSIZE]; 513 514 (void)memset(dummy, 'x', DUMMYSIZE - 1); 515 dummy[DUMMYSIZE - 1] = '\0'; 516 517 (void)setenv("inetd_dummy", dummy, 1); 518 } 519 520 for (;;) { 521 int n, ctrl; 522 fd_set readable; 523 524 if (nsock == 0) { 525 (void) sigblock(SIGBLOCK); 526 while (nsock == 0) 527 sigpause(0L); 528 (void) sigsetmask(0L); 529 } 530 readable = allsock; 531 if ((n = select(maxsock + 1, &readable, (fd_set *)0, 532 (fd_set *)0, (struct timeval *)0)) <= 0) { 533 if (n == -1 && errno != EINTR) { 534 syslog(LOG_WARNING, "select: %m"); 535 sleep(1); 536 } 537 continue; 538 } 539 for (sep = servtab; n && sep; sep = nsep) { 540 nsep = sep->se_next; 541 if (sep->se_fd == -1 || 542 !FD_ISSET(sep->se_fd, &readable)) 543 continue; 544 545 n--; 546 if (debug) 547 fprintf(stderr, "someone wants %s\n", sep->se_service); 548 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 549 /* XXX here do the libwrap check-before-accept */ 550 ctrl = accept(sep->se_fd, (struct sockaddr *)0, 551 (int *)0); 552 if (debug) 553 fprintf(stderr, "accept, ctrl %d\n", 554 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 spawn(sep, ctrl); 566 } 567 } 568 } 569 570 void 571 spawn(sep, ctrl) 572 struct servtab *sep; 573 int ctrl; 574 { 575 int dofork; 576 pid_t pid; 577 struct sigvec sv; 578 579 pid = 0; 580 #ifdef LIBWRAP_INTERNAL 581 dofork = 1; 582 #else 583 dofork = (sep->se_bi == 0 || sep->se_bi->bi_fork); 584 #endif 585 if (dofork) { 586 if (sep->se_count++ == 0) 587 (void)gettimeofday(&sep->se_time, (struct timezone *)0); 588 else if (sep->se_count >= sep->se_max) { 589 struct timeval now; 590 591 (void)gettimeofday(&now, (struct timezone *)0); 592 if (now.tv_sec - sep->se_time.tv_sec > CNT_INTVL) { 593 sep->se_time = now; 594 sep->se_count = 1; 595 } else { 596 syslog(LOG_ERR, 597 "%s/%s server failing (looping), service terminated\n", 598 sep->se_service, sep->se_proto); 599 if (!sep->se_wait && sep->se_socktype == 600 SOCK_STREAM) 601 close(ctrl); 602 close_sep(sep); 603 sigsetmask(0L); 604 if (!timingout) { 605 timingout = 1; 606 alarm(RETRYTIME); 607 } 608 return; 609 } 610 } 611 pid = fork(); 612 if (pid < 0) { 613 syslog(LOG_ERR, "fork: %m"); 614 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 615 close(ctrl); 616 sigsetmask(0L); 617 sleep(1); 618 return; 619 } 620 if (pid != 0 && sep->se_wait) { 621 sep->se_wait = pid; 622 FD_CLR(sep->se_fd, &allsock); 623 nsock--; 624 } 625 if (pid == 0) { 626 memset(&sv, 0, sizeof(sv)); 627 sv.sv_mask = 0L; 628 sv.sv_handler = SIG_DFL; 629 sigvec(SIGPIPE, &sv, (struct sigvec *)0); 630 if (debug) 631 setsid(); 632 } 633 } 634 sigsetmask(0L); 635 if (pid == 0) { 636 run_service(ctrl, sep); 637 if (dofork) 638 exit(0); 639 } 640 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 641 close(ctrl); 642 } 643 644 void 645 run_service(ctrl, sep) 646 int ctrl; 647 struct servtab *sep; 648 { 649 struct passwd *pwd; 650 struct group *grp = NULL; /* XXX gcc */ 651 char buf[NI_MAXSERV]; 652 #ifdef LIBWRAP 653 struct request_info req; 654 int denied; 655 char *service = NULL; /* XXX gcc */ 656 #endif 657 658 #ifdef LIBWRAP 659 #ifndef LIBWRAP_INTERNAL 660 if (sep->se_bi == 0) 661 #endif 662 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 663 request_init(&req, RQ_DAEMON, sep->se_argv[0] ? 664 sep->se_argv[0] : sep->se_service, RQ_FILE, ctrl, NULL); 665 fromhost(&req); 666 denied = !hosts_access(&req); 667 if (denied || lflag) { 668 if (getnameinfo(&sep->se_ctrladdr, 669 sep->se_ctrladdr.sa_len, NULL, 0, 670 buf, sizeof(buf), 0) != 0) { 671 /* shouldn't happen */ 672 (void)snprintf(buf, sizeof buf, "%d", 673 ntohs(sep->se_ctrladdr_in.sin_port)); 674 } 675 service = buf; 676 } 677 if (denied) { 678 syslog(deny_severity, 679 "refused connection from %.500s, service %s (%s)", 680 eval_client(&req), service, sep->se_proto); 681 goto reject; 682 } 683 if (lflag) { 684 syslog(allow_severity, 685 "connection from %.500s, service %s (%s)", 686 eval_client(&req), service, sep->se_proto); 687 } 688 } 689 #endif /* LIBWRAP */ 690 691 if (sep->se_bi) { 692 (*sep->se_bi->bi_fn)(ctrl, sep); 693 } else { 694 if ((pwd = getpwnam(sep->se_user)) == NULL) { 695 syslog(LOG_ERR, "%s/%s: %s: No such user", 696 sep->se_service, sep->se_proto, sep->se_user); 697 goto reject; 698 } 699 if (sep->se_group && 700 (grp = getgrnam(sep->se_group)) == NULL) { 701 syslog(LOG_ERR, "%s/%s: %s: No such group", 702 sep->se_service, sep->se_proto, sep->se_group); 703 goto reject; 704 } 705 if (pwd->pw_uid) { 706 if (sep->se_group) 707 pwd->pw_gid = grp->gr_gid; 708 if (setgid(pwd->pw_gid) < 0) { 709 syslog(LOG_ERR, 710 "%s/%s: can't set gid %d: %m", sep->se_service, 711 sep->se_proto, pwd->pw_gid); 712 goto reject; 713 } 714 (void) initgroups(pwd->pw_name, 715 pwd->pw_gid); 716 if (setuid(pwd->pw_uid) < 0) { 717 syslog(LOG_ERR, 718 "%s/%s: can't set uid %d: %m", sep->se_service, 719 sep->se_proto, pwd->pw_uid); 720 goto reject; 721 } 722 } else if (sep->se_group) { 723 (void) setgid((gid_t)grp->gr_gid); 724 } 725 if (debug) 726 fprintf(stderr, "%d execl %s\n", 727 getpid(), sep->se_server); 728 #ifdef MULOG 729 if (sep->se_log) 730 dolog(sep, ctrl); 731 #endif 732 /* Set our control descriptor to not close-on-exec... */ 733 if (fcntl(ctrl, F_SETFD, 0) < 0) 734 syslog(LOG_ERR, "fcntl (F_SETFD, 0): %m"); 735 /* ...and dup it to stdin, stdout, and stderr. */ 736 if (ctrl != 0) { 737 dup2(ctrl, 0); 738 close(ctrl); 739 ctrl = 0; 740 } 741 dup2(0, 1); 742 dup2(0, 2); 743 #ifdef RLIMIT_NOFILE 744 if (rlim_ofile.rlim_cur != rlim_ofile_cur && 745 setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) 746 syslog(LOG_ERR, "setrlimit: %m"); 747 #endif 748 execv(sep->se_server, sep->se_argv); 749 syslog(LOG_ERR, "cannot execute %s: %m", sep->se_server); 750 reject: 751 if (sep->se_socktype != SOCK_STREAM) 752 recv(ctrl, buf, sizeof (buf), 0); 753 _exit(1); 754 } 755 } 756 757 void 758 reapchild(signo) 759 int signo; 760 { 761 int status; 762 pid_t pid; 763 struct servtab *sep; 764 765 for (;;) { 766 pid = wait3(&status, WNOHANG, (struct rusage *)0); 767 if (pid <= 0) 768 break; 769 if (debug) 770 fprintf(stderr, "%d reaped, status %#x\n", 771 pid, status); 772 for (sep = servtab; sep; sep = sep->se_next) 773 if (sep->se_wait == pid) { 774 if (WIFEXITED(status) && WEXITSTATUS(status)) 775 syslog(LOG_WARNING, 776 "%s: exit status 0x%x", 777 sep->se_server, WEXITSTATUS(status)); 778 else if (WIFSIGNALED(status)) 779 syslog(LOG_WARNING, 780 "%s: exit signal 0x%x", 781 sep->se_server, WTERMSIG(status)); 782 sep->se_wait = 1; 783 FD_SET(sep->se_fd, &allsock); 784 nsock++; 785 if (debug) 786 fprintf(stderr, "restored %s, fd %d\n", 787 sep->se_service, sep->se_fd); 788 } 789 } 790 } 791 792 void 793 config(signo) 794 int signo; 795 { 796 struct servtab *sep, *cp, **sepp; 797 long omask; 798 int n; 799 800 if (!setconfig()) { 801 syslog(LOG_ERR, "%s: %m", CONFIG); 802 return; 803 } 804 for (sep = servtab; sep; sep = sep->se_next) 805 sep->se_checked = 0; 806 while ((cp = getconfigent())) { 807 for (sep = servtab; sep; sep = sep->se_next) 808 if (strcmp(sep->se_service, cp->se_service) == 0 && 809 strcmp(sep->se_hostaddr, cp->se_hostaddr) == 0 && 810 strcmp(sep->se_proto, cp->se_proto) == 0 && 811 ISMUX(sep) == ISMUX(cp)) 812 break; 813 if (sep != 0) { 814 int i; 815 816 #define SWAP(type, a, b) {type c=(type)a; (type)a=(type)b; (type)b=(type)c;} 817 818 omask = sigblock(SIGBLOCK); 819 /* 820 * sep->se_wait may be holding the pid of a daemon 821 * that we're waiting for. If so, don't overwrite 822 * it unless the config file explicitly says don't 823 * wait. 824 */ 825 if (cp->se_bi == 0 && 826 (sep->se_wait == 1 || cp->se_wait == 0)) 827 sep->se_wait = cp->se_wait; 828 SWAP(char *, sep->se_user, cp->se_user); 829 SWAP(char *, sep->se_group, cp->se_group); 830 SWAP(char *, sep->se_server, cp->se_server); 831 for (i = 0; i < MAXARGV; i++) 832 SWAP(char *, sep->se_argv[i], cp->se_argv[i]); 833 #ifdef IPSEC 834 SWAP(char *, sep->se_policy, cp->se_policy); 835 #endif 836 SWAP(int, cp->se_type, sep->se_type); 837 SWAP(int, cp->se_max, sep->se_max); 838 #undef SWAP 839 if (isrpcservice(sep)) 840 unregister_rpc(sep); 841 sep->se_rpcversl = cp->se_rpcversl; 842 sep->se_rpcversh = cp->se_rpcversh; 843 sigsetmask(omask); 844 freeconfig(cp); 845 if (debug) 846 print_service("REDO", sep); 847 } else { 848 sep = enter(cp); 849 if (debug) 850 print_service("ADD ", sep); 851 } 852 sep->se_checked = 1; 853 854 switch (sep->se_family) { 855 case AF_LOCAL: 856 if (sep->se_fd != -1) 857 break; 858 n = strlen(sep->se_service); 859 if (n > sizeof(sep->se_ctrladdr_un.sun_path)) { 860 syslog(LOG_ERR, "%s: address too long", 861 sep->se_service); 862 sep->se_checked = 0; 863 continue; 864 } 865 (void)unlink(sep->se_service); 866 strncpy(sep->se_ctrladdr_un.sun_path, 867 sep->se_service, n); 868 sep->se_ctrladdr_un.sun_family = AF_LOCAL; 869 sep->se_ctrladdr_size = n + 870 sizeof(sep->se_ctrladdr_un) - 871 sizeof(sep->se_ctrladdr_un.sun_path); 872 if (!ISMUX(sep)) 873 setup(sep); 874 break; 875 case AF_INET: 876 #ifdef INET6 877 case AF_INET6: 878 #endif 879 { 880 struct addrinfo hints, *res; 881 char *host, *port; 882 int error; 883 int s; 884 885 /* check if the family is supported */ 886 s = socket(sep->se_family, SOCK_DGRAM, 0); 887 if (s < 0) { 888 syslog(LOG_WARNING, 889 "%s/%s: %s: the address family is not supported by the kernel", 890 sep->se_service, sep->se_proto, 891 sep->se_hostaddr); 892 sep->se_checked = 0; 893 continue; 894 } 895 close(s); 896 897 memset(&hints, 0, sizeof(hints)); 898 hints.ai_family = sep->se_family; 899 hints.ai_socktype = sep->se_socktype; 900 hints.ai_flags = AI_PASSIVE; 901 if (!strcmp(sep->se_hostaddr, "*")) 902 host = NULL; 903 else 904 host = sep->se_hostaddr; 905 if (isrpcservice(sep) || ISMUX(sep)) 906 port = "0"; 907 else 908 port = sep->se_service; 909 error = getaddrinfo(host, port, &hints, &res); 910 if (error) { 911 if (error == EAI_SERVICE) { 912 /* gai_strerror not friendly enough */ 913 syslog(LOG_WARNING, "%s/%s: " 914 "unknown service", 915 sep->se_service, sep->se_proto); 916 } else { 917 syslog(LOG_ERR, "%s/%s: %s: %s", 918 sep->se_service, sep->se_proto, 919 sep->se_hostaddr, 920 gai_strerror(error)); 921 } 922 sep->se_checked = 0; 923 continue; 924 } 925 if (res->ai_next) { 926 syslog(LOG_ERR, 927 "%s/%s: %s: resolved to multiple addr", 928 sep->se_service, sep->se_proto, 929 sep->se_hostaddr); 930 sep->se_checked = 0; 931 freeaddrinfo(res); 932 continue; 933 } 934 memcpy(&sep->se_ctrladdr, res->ai_addr, 935 res->ai_addrlen); 936 if (ISMUX(sep)) { 937 sep->se_fd = -1; 938 freeaddrinfo(res); 939 continue; 940 } 941 sep->se_ctrladdr_size = res->ai_addrlen; 942 freeaddrinfo(res); 943 #ifdef RPC 944 if (isrpcservice(sep)) { 945 struct rpcent *rp; 946 947 sep->se_rpcprog = atoi(sep->se_service); 948 if (sep->se_rpcprog == 0) { 949 rp = getrpcbyname(sep->se_service); 950 if (rp == 0) { 951 syslog(LOG_ERR, 952 "%s/%s: unknown service", 953 sep->se_service, 954 sep->se_proto); 955 sep->se_checked = 0; 956 continue; 957 } 958 sep->se_rpcprog = rp->r_number; 959 } 960 if (sep->se_fd == -1 && !ISMUX(sep)) 961 setup(sep); 962 if (sep->se_fd != -1) 963 register_rpc(sep); 964 } else 965 #endif 966 { 967 if (sep->se_fd >= 0) 968 close_sep(sep); 969 if (sep->se_fd == -1 && !ISMUX(sep)) 970 setup(sep); 971 } 972 } 973 } 974 } 975 endconfig(); 976 /* 977 * Purge anything not looked at above. 978 */ 979 omask = sigblock(SIGBLOCK); 980 sepp = &servtab; 981 while ((sep = *sepp)) { 982 if (sep->se_checked) { 983 sepp = &sep->se_next; 984 continue; 985 } 986 *sepp = sep->se_next; 987 if (sep->se_fd >= 0) 988 close_sep(sep); 989 if (isrpcservice(sep)) 990 unregister_rpc(sep); 991 if (sep->se_family == AF_LOCAL) 992 (void)unlink(sep->se_service); 993 if (debug) 994 print_service("FREE", sep); 995 freeconfig(sep); 996 free((char *)sep); 997 } 998 (void) sigsetmask(omask); 999 } 1000 1001 void 1002 retry(signo) 1003 int signo; 1004 { 1005 struct servtab *sep; 1006 1007 timingout = 0; 1008 for (sep = servtab; sep; sep = sep->se_next) { 1009 if (sep->se_fd == -1 && !ISMUX(sep)) { 1010 switch (sep->se_family) { 1011 case AF_LOCAL: 1012 case AF_INET: 1013 #ifdef INET6 1014 case AF_INET6: 1015 #endif 1016 setup(sep); 1017 if (sep->se_fd != -1 && isrpcservice(sep)) 1018 register_rpc(sep); 1019 break; 1020 } 1021 } 1022 } 1023 } 1024 1025 void 1026 goaway(signo) 1027 int signo; 1028 { 1029 struct servtab *sep; 1030 1031 for (sep = servtab; sep; sep = sep->se_next) { 1032 if (sep->se_fd == -1) 1033 continue; 1034 1035 switch (sep->se_family) { 1036 case AF_LOCAL: 1037 (void)unlink(sep->se_service); 1038 break; 1039 case AF_INET: 1040 #ifdef INET6 1041 case AF_INET6: 1042 #endif 1043 if (sep->se_wait == 1 && isrpcservice(sep)) 1044 unregister_rpc(sep); 1045 break; 1046 } 1047 (void)close(sep->se_fd); 1048 } 1049 exit(0); 1050 } 1051 1052 void 1053 setup(sep) 1054 struct servtab *sep; 1055 { 1056 int on = 1; 1057 1058 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) { 1059 if (debug) 1060 fprintf(stderr, "socket failed on %s/%s: %s\n", 1061 sep->se_service, sep->se_proto, strerror(errno)); 1062 syslog(LOG_ERR, "%s/%s: socket: %m", 1063 sep->se_service, sep->se_proto); 1064 return; 1065 } 1066 /* Set all listening sockets to close-on-exec. */ 1067 if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) 1068 syslog(LOG_ERR, "fcntl (F_SETFD, FD_CLOEXEC): %m"); 1069 1070 #define turnon(fd, opt) \ 1071 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 1072 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 1073 turnon(sep->se_fd, SO_DEBUG) < 0) 1074 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 1075 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 1076 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 1077 #undef turnon 1078 1079 /* Set the socket buffer sizes, if specified. */ 1080 if (sep->se_sndbuf != 0 && setsockopt(sep->se_fd, SOL_SOCKET, 1081 SO_SNDBUF, (char *)&sep->se_sndbuf, sizeof(sep->se_sndbuf)) < 0) 1082 syslog(LOG_ERR, "setsockopt (SO_SNDBUF %d): %m", 1083 sep->se_sndbuf); 1084 if (sep->se_rcvbuf != 0 && setsockopt(sep->se_fd, SOL_SOCKET, 1085 SO_RCVBUF, (char *)&sep->se_rcvbuf, sizeof(sep->se_rcvbuf)) < 0) 1086 syslog(LOG_ERR, "setsockopt (SO_RCVBUF %d): %m", 1087 sep->se_rcvbuf); 1088 if (sep->se_type == FAITH_TYPE && setsockopt(sep->se_fd, IPPROTO_IPV6, 1089 IPV6_FAITH, (char *)&on, sizeof(on)) < 0) 1090 syslog(LOG_ERR, "setsockopt (IPV6_FAITH): %m"); 1091 #ifdef IPSEC 1092 if (ipsecsetup(sep->se_family, sep->se_fd, sep->se_policy) < 0 && 1093 sep->se_policy) { 1094 syslog(LOG_ERR, "%s/%s: ipsec setup failed", 1095 sep->se_service, sep->se_proto); 1096 (void)close(sep->se_fd); 1097 sep->se_fd = -1; 1098 return; 1099 } 1100 #endif 1101 1102 if (bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size) < 0) { 1103 if (debug) 1104 fprintf(stderr, "bind failed on %s/%s: %s\n", 1105 sep->se_service, sep->se_proto, strerror(errno)); 1106 syslog(LOG_ERR, "%s/%s: bind: %m", 1107 sep->se_service, sep->se_proto); 1108 (void) close(sep->se_fd); 1109 sep->se_fd = -1; 1110 if (!timingout) { 1111 timingout = 1; 1112 alarm(RETRYTIME); 1113 } 1114 return; 1115 } 1116 if (sep->se_socktype == SOCK_STREAM) 1117 listen(sep->se_fd, 10); 1118 1119 FD_SET(sep->se_fd, &allsock); 1120 nsock++; 1121 if (sep->se_fd > maxsock) { 1122 maxsock = sep->se_fd; 1123 if (maxsock > rlim_ofile_cur - FD_MARGIN) 1124 bump_nofile(); 1125 } 1126 if (debug) 1127 fprintf(stderr, "registered %s on %d\n", 1128 sep->se_server, sep->se_fd); 1129 } 1130 1131 /* 1132 * Finish with a service and its socket. 1133 */ 1134 void 1135 close_sep(sep) 1136 struct servtab *sep; 1137 { 1138 if (sep->se_fd >= 0) { 1139 nsock--; 1140 FD_CLR(sep->se_fd, &allsock); 1141 (void) close(sep->se_fd); 1142 sep->se_fd = -1; 1143 } 1144 sep->se_count = 0; 1145 /* 1146 * Don't keep the pid of this running daemon: when reapchild() 1147 * reaps this pid, it would erroneously increment nsock. 1148 */ 1149 if (sep->se_wait > 1) 1150 sep->se_wait = 1; 1151 } 1152 1153 void 1154 register_rpc(sep) 1155 struct servtab *sep; 1156 { 1157 #ifdef RPC 1158 int n; 1159 struct netbuf nbuf; 1160 struct sockaddr_storage ss; 1161 struct netconfig *nconf; 1162 1163 if ((nconf = getnetconfigent(sep->se_proto+4)) == NULL) { 1164 syslog(LOG_ERR, "%s: getnetconfigent failed", 1165 sep->se_proto); 1166 return; 1167 } 1168 n = sizeof ss; 1169 if (getsockname(sep->se_fd, (struct sockaddr *)&ss, &n) < 0) { 1170 syslog(LOG_ERR, "%s/%s: getsockname: %m", 1171 sep->se_service, sep->se_proto); 1172 return; 1173 } 1174 1175 nbuf.buf = &ss; 1176 nbuf.len = ss.ss_len; 1177 nbuf.maxlen = sizeof (struct sockaddr_storage); 1178 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1179 if (debug) 1180 fprintf(stderr, "rpcb_set: %u %d %s %s\n", 1181 sep->se_rpcprog, n, nconf->nc_netid, 1182 taddr2uaddr(nconf, &nbuf)); 1183 (void)rpcb_unset(sep->se_rpcprog, n, nconf); 1184 if (!rpcb_set(sep->se_rpcprog, n, nconf, &nbuf)) 1185 syslog(LOG_ERR, "rpcb_set: %u %d %s %s%s", 1186 sep->se_rpcprog, n, nconf->nc_netid, 1187 taddr2uaddr(nconf, &nbuf), clnt_spcreateerror("")); 1188 } 1189 #endif /* RPC */ 1190 } 1191 1192 void 1193 unregister_rpc(sep) 1194 struct servtab *sep; 1195 { 1196 #ifdef RPC 1197 int n; 1198 struct netconfig *nconf; 1199 1200 if ((nconf = getnetconfigent(sep->se_proto+4)) == NULL) { 1201 syslog(LOG_ERR, "%s: getnetconfigent failed", 1202 sep->se_proto); 1203 return; 1204 } 1205 1206 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1207 if (debug) 1208 fprintf(stderr, "rpcb_unset(%u, %d, %s)\n", 1209 sep->se_rpcprog, n, nconf->nc_netid); 1210 if (!rpcb_unset(sep->se_rpcprog, n, nconf)) 1211 syslog(LOG_ERR, "rpcb_unset(%u, %d, %s) failed\n", 1212 sep->se_rpcprog, n, nconf->nc_netid); 1213 } 1214 #endif /* RPC */ 1215 } 1216 1217 1218 struct servtab * 1219 enter(cp) 1220 struct servtab *cp; 1221 { 1222 struct servtab *sep; 1223 long omask; 1224 1225 sep = (struct servtab *)malloc(sizeof (*sep)); 1226 if (sep == (struct servtab *)0) { 1227 syslog(LOG_ERR, "Out of memory."); 1228 exit(1); 1229 } 1230 *sep = *cp; 1231 sep->se_fd = -1; 1232 sep->se_rpcprog = -1; 1233 omask = sigblock(SIGBLOCK); 1234 sep->se_next = servtab; 1235 servtab = sep; 1236 sigsetmask(omask); 1237 return (sep); 1238 } 1239 1240 FILE *fconfig = NULL; 1241 struct servtab serv; 1242 char line[LINE_MAX]; 1243 char *defhost; 1244 #ifdef IPSEC 1245 static char *policy = NULL; 1246 #endif 1247 1248 int 1249 setconfig() 1250 { 1251 if (defhost) 1252 free(defhost); 1253 defhost = newstr("*"); 1254 #ifdef IPSEC 1255 if (policy) 1256 free(policy); 1257 policy = NULL; 1258 #endif 1259 if (fconfig != NULL) { 1260 fseek(fconfig, 0L, SEEK_SET); 1261 return (1); 1262 } 1263 fconfig = fopen(CONFIG, "r"); 1264 return (fconfig != NULL); 1265 } 1266 1267 void 1268 endconfig() 1269 { 1270 if (fconfig) { 1271 (void) fclose(fconfig); 1272 fconfig = NULL; 1273 } 1274 if (defhost) { 1275 free(defhost); 1276 defhost = 0; 1277 } 1278 } 1279 1280 struct servtab * 1281 getconfigent() 1282 { 1283 struct servtab *sep = &serv; 1284 int argc, val; 1285 char *cp, *cp0, *arg, *buf0, *buf1, *sz0, *sz1; 1286 static char TCPMUX_TOKEN[] = "tcpmux/"; 1287 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) 1288 char *hostdelim; 1289 1290 more: 1291 while ((cp = nextline(fconfig))) { 1292 #ifdef IPSEC 1293 /* lines starting with #@ is not a comment, but the policy */ 1294 if (cp[0] == '#' && cp[1] == '@') { 1295 char *p; 1296 for (p = cp + 2; p && *p && isspace(*p); p++) 1297 ; 1298 if (*p == '\0') { 1299 if (policy) 1300 free(policy); 1301 policy = NULL; 1302 } else { 1303 if (ipsecsetup_test(p) < 0) { 1304 syslog(LOG_ERR, 1305 "%s: invalid ipsec policy \"%s\"", 1306 CONFIG, p); 1307 exit(1); 1308 } else { 1309 if (policy) 1310 free(policy); 1311 policy = newstr(p); 1312 } 1313 } 1314 } 1315 #endif 1316 if (*cp == '#' || *cp == '\0') 1317 continue; 1318 #ifdef MULOG 1319 /* Avoid use of `skip' if there is a danger of it looking 1320 * at continuation lines. 1321 */ 1322 do { 1323 cp++; 1324 } while (*cp == ' ' || *cp == '\t'); 1325 if (*cp == '\0') 1326 continue; 1327 if ((arg = skip(&cp)) == NULL) 1328 continue; 1329 if (strcmp(arg, "DOMAIN")) 1330 continue; 1331 if (curdom) 1332 free(curdom); 1333 curdom = NULL; 1334 while (*cp == ' ' || *cp == '\t') 1335 cp++; 1336 if (*cp == '\0') 1337 continue; 1338 arg = cp; 1339 while (*cp && *cp != ' ' && *cp != '\t') 1340 cp++; 1341 if (*cp != '\0') 1342 *cp++ = '\0'; 1343 curdom = newstr(arg); 1344 #endif 1345 break; 1346 } 1347 if (cp == NULL) 1348 return ((struct servtab *)0); 1349 /* 1350 * clear the static buffer, since some fields (se_ctrladdr, 1351 * for example) don't get initialized here. 1352 */ 1353 memset((caddr_t)sep, 0, sizeof *sep); 1354 arg = skip(&cp); 1355 if (cp == NULL) { 1356 /* got an empty line containing just blanks/tabs. */ 1357 goto more; 1358 } 1359 /* Check for a host name. */ 1360 hostdelim = strrchr(arg, ':'); 1361 if (hostdelim) { 1362 *hostdelim = '\0'; 1363 if (arg[0] == '[' && hostdelim > arg && hostdelim[-1] == ']') { 1364 hostdelim[-1] = '\0'; 1365 sep->se_hostaddr = newstr(arg + 1); 1366 } else 1367 sep->se_hostaddr = newstr(arg); 1368 arg = hostdelim + 1; 1369 /* 1370 * If the line is of the form `host:', then just change the 1371 * default host for the following lines. 1372 */ 1373 if (*arg == '\0') { 1374 arg = skip(&cp); 1375 if (cp == NULL) { 1376 free(defhost); 1377 defhost = sep->se_hostaddr; 1378 goto more; 1379 } 1380 } 1381 } else 1382 sep->se_hostaddr = newstr(defhost); 1383 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1384 char *c = arg + MUX_LEN; 1385 if (*c == '+') { 1386 sep->se_type = MUXPLUS_TYPE; 1387 c++; 1388 } else 1389 sep->se_type = MUX_TYPE; 1390 sep->se_service = newstr(c); 1391 } else { 1392 sep->se_service = newstr(arg); 1393 sep->se_type = NORM_TYPE; 1394 } 1395 1396 arg = sskip(&cp); 1397 if (strcmp(arg, "stream") == 0) 1398 sep->se_socktype = SOCK_STREAM; 1399 else if (strcmp(arg, "dgram") == 0) 1400 sep->se_socktype = SOCK_DGRAM; 1401 else if (strcmp(arg, "rdm") == 0) 1402 sep->se_socktype = SOCK_RDM; 1403 else if (strcmp(arg, "seqpacket") == 0) 1404 sep->se_socktype = SOCK_SEQPACKET; 1405 else if (strcmp(arg, "raw") == 0) 1406 sep->se_socktype = SOCK_RAW; 1407 else 1408 sep->se_socktype = -1; 1409 1410 arg = sskip(&cp); 1411 if (sep->se_type == NORM_TYPE && 1412 strncmp(arg, "faith/", strlen("faith/")) == 0) { 1413 arg += strlen("faith/"); 1414 sep->se_type = FAITH_TYPE; 1415 } 1416 sep->se_proto = newstr(arg); 1417 1418 #define MALFORMED(arg) \ 1419 do { \ 1420 syslog(LOG_ERR, "%s: malformed buffer size option `%s'", \ 1421 sep->se_service, (arg)); \ 1422 goto more; \ 1423 } while (0) 1424 1425 #define GETVAL(arg) \ 1426 do { \ 1427 if (!isdigit(*(arg))) \ 1428 MALFORMED(arg); \ 1429 val = strtol((arg), &cp0, 10); \ 1430 if (cp0 != NULL) { \ 1431 if (cp0[1] != '\0') \ 1432 MALFORMED((arg)); \ 1433 if (cp0[0] == 'k') \ 1434 val *= 1024; \ 1435 if (cp0[0] == 'm') \ 1436 val *= 1024 * 1024; \ 1437 } \ 1438 if (val < 1) { \ 1439 syslog(LOG_ERR, "%s: invalid buffer size `%s'", \ 1440 sep->se_service, (arg)); \ 1441 goto more; \ 1442 } \ 1443 } while (0) 1444 1445 #define ASSIGN(arg) \ 1446 do { \ 1447 if (strcmp((arg), "sndbuf") == 0) \ 1448 sep->se_sndbuf = val; \ 1449 else if (strcmp((arg), "rcvbuf") == 0) \ 1450 sep->se_rcvbuf = val; \ 1451 else \ 1452 MALFORMED((arg)); \ 1453 } while (0) 1454 1455 /* 1456 * Extract the send and receive buffer sizes before parsing 1457 * the protocol. 1458 */ 1459 sep->se_sndbuf = sep->se_rcvbuf = 0; 1460 buf0 = buf1 = sz0 = sz1 = NULL; 1461 if ((buf0 = strchr(sep->se_proto, ',')) != NULL) { 1462 /* Not meaningful for Tcpmux services. */ 1463 if (ISMUX(sep)) { 1464 syslog(LOG_ERR, "%s: can't specify buffer sizes for " 1465 "tcpmux services", sep->se_service); 1466 goto more; 1467 } 1468 1469 /* Skip the , */ 1470 *buf0++ = '\0'; 1471 1472 /* Check to see if another socket buffer size was specified. */ 1473 if ((buf1 = strchr(buf0, ',')) != NULL) { 1474 /* Skip the , */ 1475 *buf1++ = '\0'; 1476 1477 /* Make sure a 3rd one wasn't specified. */ 1478 if (strchr(buf1, ',') != NULL) { 1479 syslog(LOG_ERR, "%s: too many buffer sizes", 1480 sep->se_service); 1481 goto more; 1482 } 1483 1484 /* Locate the size. */ 1485 if ((sz1 = strchr(buf1, '=')) == NULL) 1486 MALFORMED(buf1); 1487 1488 /* Skip the = */ 1489 *sz1++ = '\0'; 1490 } 1491 1492 /* Locate the size. */ 1493 if ((sz0 = strchr(buf0, '=')) == NULL) 1494 MALFORMED(buf0); 1495 1496 /* Skip the = */ 1497 *sz0++ = '\0'; 1498 1499 GETVAL(sz0); 1500 ASSIGN(buf0); 1501 1502 if (buf1 != NULL) { 1503 GETVAL(sz1); 1504 ASSIGN(buf1); 1505 } 1506 } 1507 1508 #undef ASSIGN 1509 #undef GETVAL 1510 #undef MALFORMED 1511 1512 if (strcmp(sep->se_proto, "unix") == 0) { 1513 sep->se_family = AF_LOCAL; 1514 } else { 1515 val = strlen(sep->se_proto); 1516 if (!val) { 1517 syslog(LOG_ERR, "%s: invalid protocol specified", 1518 sep->se_service); 1519 goto more; 1520 } 1521 val = sep->se_proto[val - 1]; 1522 switch (val) { 1523 case '4': /*tcp4 or udp4*/ 1524 sep->se_family = AF_INET; 1525 break; 1526 #ifdef INET6 1527 case '6': /*tcp6 or udp6*/ 1528 sep->se_family = AF_INET6; 1529 break; 1530 #endif 1531 default: 1532 sep->se_family = AF_INET; /*will become AF_INET6*/ 1533 break; 1534 } 1535 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1536 #ifdef RPC 1537 char *cp, *ccp; 1538 cp = strchr(sep->se_service, '/'); 1539 if (cp == 0) { 1540 syslog(LOG_ERR, "%s: no rpc version", 1541 sep->se_service); 1542 goto more; 1543 } 1544 *cp++ = '\0'; 1545 sep->se_rpcversl = sep->se_rpcversh = 1546 strtol(cp, &ccp, 0); 1547 if (ccp == cp) { 1548 badafterall: 1549 syslog(LOG_ERR, "%s/%s: bad rpc version", 1550 sep->se_service, cp); 1551 goto more; 1552 } 1553 if (*ccp == '-') { 1554 cp = ccp + 1; 1555 sep->se_rpcversh = strtol(cp, &ccp, 0); 1556 if (ccp == cp) 1557 goto badafterall; 1558 } 1559 #else 1560 syslog(LOG_ERR, "%s: rpc services not suported", 1561 sep->se_service); 1562 goto more; 1563 #endif /* RPC */ 1564 } 1565 } 1566 arg = sskip(&cp); 1567 { 1568 char *cp; 1569 if ((cp = strchr(arg, ':')) == NULL) 1570 cp = strchr(arg, '.'); 1571 if (cp != NULL) { 1572 *cp++ = '\0'; 1573 sep->se_max = atoi(cp); 1574 } else 1575 sep->se_max = TOOMANY; 1576 } 1577 sep->se_wait = strcmp(arg, "wait") == 0; 1578 if (ISMUX(sep)) { 1579 /* 1580 * Silently enforce "nowait" for TCPMUX services since 1581 * they don't have an assigned port to listen on. 1582 */ 1583 sep->se_wait = 0; 1584 1585 if (strncmp(sep->se_proto, "tcp", 3)) { 1586 syslog(LOG_ERR, 1587 "%s: bad protocol for tcpmux service %s", 1588 CONFIG, sep->se_service); 1589 goto more; 1590 } 1591 if (sep->se_socktype != SOCK_STREAM) { 1592 syslog(LOG_ERR, 1593 "%s: bad socket type for tcpmux service %s", 1594 CONFIG, sep->se_service); 1595 goto more; 1596 } 1597 } 1598 sep->se_user = newstr(sskip(&cp)); 1599 if ((sep->se_group = strchr(sep->se_user, ':')) != NULL) 1600 *sep->se_group++ = '\0'; 1601 else if ((sep->se_group = strchr(sep->se_user, '.')) != NULL) 1602 *sep->se_group++ = '\0'; 1603 1604 sep->se_server = newstr(sskip(&cp)); 1605 if (strcmp(sep->se_server, "internal") == 0) { 1606 struct biltin *bi; 1607 1608 for (bi = biltins; bi->bi_service; bi++) 1609 if (bi->bi_socktype == sep->se_socktype && 1610 strcmp(bi->bi_service, sep->se_service) == 0) 1611 break; 1612 if (bi->bi_service == 0) { 1613 syslog(LOG_ERR, "internal service %s unknown", 1614 sep->se_service); 1615 goto more; 1616 } 1617 sep->se_bi = bi; 1618 sep->se_wait = bi->bi_wait; 1619 } else 1620 sep->se_bi = NULL; 1621 argc = 0; 1622 for (arg = skip(&cp); cp; arg = skip(&cp)) { 1623 #if MULOG 1624 char *colon; 1625 1626 if (argc == 0 && (colon = strrchr(arg, ':'))) { 1627 while (arg < colon) { 1628 int x; 1629 char *ccp; 1630 1631 switch (*arg++) { 1632 case 'l': 1633 x = 1; 1634 if (isdigit(*arg)) { 1635 x = strtol(arg, &ccp, 0); 1636 if (ccp == arg) 1637 break; 1638 arg = ccp; 1639 } 1640 sep->se_log &= ~MULOG_RFC931; 1641 sep->se_log |= x; 1642 break; 1643 case 'a': 1644 sep->se_log |= MULOG_RFC931; 1645 break; 1646 default: 1647 break; 1648 } 1649 } 1650 arg = colon + 1; 1651 } 1652 #endif 1653 if (argc < MAXARGV) 1654 sep->se_argv[argc++] = newstr(arg); 1655 } 1656 while (argc <= MAXARGV) 1657 sep->se_argv[argc++] = NULL; 1658 #ifdef IPSEC 1659 sep->se_policy = policy ? newstr(policy) : NULL; 1660 #endif 1661 return (sep); 1662 } 1663 1664 void 1665 freeconfig(cp) 1666 struct servtab *cp; 1667 { 1668 int i; 1669 1670 if (cp->se_hostaddr) 1671 free(cp->se_hostaddr); 1672 if (cp->se_service) 1673 free(cp->se_service); 1674 if (cp->se_proto) 1675 free(cp->se_proto); 1676 if (cp->se_user) 1677 free(cp->se_user); 1678 /* Note: se_group is part of the newstr'ed se_user */ 1679 if (cp->se_server) 1680 free(cp->se_server); 1681 for (i = 0; i < MAXARGV; i++) 1682 if (cp->se_argv[i]) 1683 free(cp->se_argv[i]); 1684 #ifdef IPSEC 1685 if (cp->se_policy) 1686 free(cp->se_policy); 1687 #endif 1688 } 1689 1690 1691 /* 1692 * Safe skip - if skip returns null, log a syntax error in the 1693 * configuration file and exit. 1694 */ 1695 char * 1696 sskip(cpp) 1697 char **cpp; 1698 { 1699 char *cp; 1700 1701 cp = skip(cpp); 1702 if (cp == NULL) { 1703 syslog(LOG_ERR, "%s: syntax error", CONFIG); 1704 exit(1); 1705 } 1706 return (cp); 1707 } 1708 1709 char * 1710 skip(cpp) 1711 char **cpp; 1712 { 1713 char *cp = *cpp; 1714 char *start; 1715 1716 if (*cpp == NULL) 1717 return ((char *)0); 1718 1719 again: 1720 while (*cp == ' ' || *cp == '\t') 1721 cp++; 1722 if (*cp == '\0') { 1723 int c; 1724 1725 c = getc(fconfig); 1726 (void) ungetc(c, fconfig); 1727 if (c == ' ' || c == '\t') 1728 if ((cp = nextline(fconfig))) 1729 goto again; 1730 *cpp = (char *)0; 1731 return ((char *)0); 1732 } 1733 start = cp; 1734 while (*cp && *cp != ' ' && *cp != '\t') 1735 cp++; 1736 if (*cp != '\0') 1737 *cp++ = '\0'; 1738 *cpp = cp; 1739 return (start); 1740 } 1741 1742 char * 1743 nextline(fd) 1744 FILE *fd; 1745 { 1746 char *cp; 1747 1748 if (fgets(line, sizeof (line), fd) == NULL) 1749 return ((char *)0); 1750 cp = strchr(line, '\n'); 1751 if (cp) 1752 *cp = '\0'; 1753 return (line); 1754 } 1755 1756 char * 1757 newstr(cp) 1758 char *cp; 1759 { 1760 if ((cp = strdup(cp ? cp : ""))) 1761 return (cp); 1762 syslog(LOG_ERR, "strdup: %m"); 1763 exit(1); 1764 } 1765 1766 void 1767 inetd_setproctitle(a, s) 1768 char *a; 1769 int s; 1770 { 1771 socklen_t size; 1772 struct sockaddr_storage ss; 1773 char hbuf[NI_MAXHOST]; 1774 1775 size = sizeof(ss); 1776 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) { 1777 if (getnameinfo((struct sockaddr *)&ss, size, hbuf, 1778 sizeof(hbuf), NULL, 0, niflags) == 0) 1779 setproctitle("-%s [%s]", a, hbuf); 1780 else 1781 setproctitle("-%s [?]", a); 1782 } else 1783 setproctitle("-%s", a); 1784 } 1785 1786 void 1787 bump_nofile() 1788 { 1789 #ifdef RLIMIT_NOFILE 1790 1791 #define FD_CHUNK 32 1792 1793 struct rlimit rl; 1794 1795 if (getrlimit(RLIMIT_NOFILE, &rl) < 0) { 1796 syslog(LOG_ERR, "getrlimit: %m"); 1797 return; 1798 } 1799 rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK); 1800 if (rl.rlim_cur <= rlim_ofile_cur) { 1801 syslog(LOG_ERR, 1802 "bump_nofile: cannot extend file limit, max = %d", 1803 (int)rl.rlim_cur); 1804 return; 1805 } 1806 1807 if (setrlimit(RLIMIT_NOFILE, &rl) < 0) { 1808 syslog(LOG_ERR, "setrlimit: %m"); 1809 return; 1810 } 1811 1812 rlim_ofile_cur = rl.rlim_cur; 1813 return; 1814 1815 #else 1816 syslog(LOG_ERR, "bump_nofile: cannot extend file limit"); 1817 return; 1818 #endif 1819 } 1820 1821 /* 1822 * Internet services provided internally by inetd: 1823 */ 1824 #define BUFSIZE 4096 1825 1826 /* ARGSUSED */ 1827 void 1828 echo_stream(s, sep) /* Echo service -- echo data back */ 1829 int s; 1830 struct servtab *sep; 1831 { 1832 char buffer[BUFSIZE]; 1833 int i; 1834 1835 inetd_setproctitle(sep->se_service, s); 1836 while ((i = read(s, buffer, sizeof(buffer))) > 0 && 1837 write(s, buffer, i) > 0) 1838 ; 1839 } 1840 1841 /* ARGSUSED */ 1842 void 1843 echo_dg(s, sep) /* Echo service -- echo data back */ 1844 int s; 1845 struct servtab *sep; 1846 { 1847 char buffer[BUFSIZE]; 1848 int i; 1849 socklen_t size; 1850 struct sockaddr_storage ss; 1851 struct sockaddr *sa; 1852 1853 sa = (struct sockaddr *)&ss; 1854 size = sizeof(ss); 1855 if ((i = recvfrom(s, buffer, sizeof(buffer), 0, sa, &size)) < 0) 1856 return; 1857 if (port_good_dg(sa)) 1858 (void) sendto(s, buffer, i, 0, sa, size); 1859 } 1860 1861 /* ARGSUSED */ 1862 void 1863 discard_stream(s, sep) /* Discard service -- ignore data */ 1864 int s; 1865 struct servtab *sep; 1866 { 1867 char buffer[BUFSIZE]; 1868 1869 inetd_setproctitle(sep->se_service, s); 1870 while ((errno = 0, read(s, buffer, sizeof(buffer)) > 0) || 1871 errno == EINTR) 1872 ; 1873 } 1874 1875 /* ARGSUSED */ 1876 void 1877 discard_dg(s, sep) /* Discard service -- ignore data */ 1878 int s; 1879 struct servtab *sep; 1880 { 1881 char buffer[BUFSIZE]; 1882 1883 (void) read(s, buffer, sizeof(buffer)); 1884 } 1885 1886 #include <ctype.h> 1887 #define LINESIZ 72 1888 char ring[128]; 1889 char *endring; 1890 1891 void 1892 initring() 1893 { 1894 int i; 1895 1896 endring = ring; 1897 1898 for (i = 0; i <= 128; ++i) 1899 if (isprint(i)) 1900 *endring++ = i; 1901 } 1902 1903 /* ARGSUSED */ 1904 void 1905 chargen_stream(s, sep) /* Character generator */ 1906 int s; 1907 struct servtab *sep; 1908 { 1909 int len; 1910 char *rs, text[LINESIZ+2]; 1911 1912 inetd_setproctitle(sep->se_service, s); 1913 1914 if (!endring) { 1915 initring(); 1916 rs = ring; 1917 } 1918 1919 text[LINESIZ] = '\r'; 1920 text[LINESIZ + 1] = '\n'; 1921 for (rs = ring;;) { 1922 if ((len = endring - rs) >= LINESIZ) 1923 memmove(text, rs, LINESIZ); 1924 else { 1925 memmove(text, rs, len); 1926 memmove(text + len, ring, LINESIZ - len); 1927 } 1928 if (++rs == endring) 1929 rs = ring; 1930 if (write(s, text, sizeof(text)) != sizeof(text)) 1931 break; 1932 } 1933 } 1934 1935 /* ARGSUSED */ 1936 void 1937 chargen_dg(s, sep) /* Character generator */ 1938 int s; 1939 struct servtab *sep; 1940 { 1941 struct sockaddr_storage ss; 1942 struct sockaddr *sa; 1943 static char *rs; 1944 int len; 1945 socklen_t size; 1946 char text[LINESIZ+2]; 1947 1948 if (endring == 0) { 1949 initring(); 1950 rs = ring; 1951 } 1952 1953 sa = (struct sockaddr *)&ss; 1954 size = sizeof(ss); 1955 if (recvfrom(s, text, sizeof(text), 0, sa, &size) < 0) 1956 return; 1957 1958 if (!port_good_dg(sa)) 1959 return; 1960 1961 if ((len = endring - rs) >= LINESIZ) 1962 memmove(text, rs, LINESIZ); 1963 else { 1964 memmove(text, rs, len); 1965 memmove(text + len, ring, LINESIZ - len); 1966 } 1967 if (++rs == endring) 1968 rs = ring; 1969 text[LINESIZ] = '\r'; 1970 text[LINESIZ + 1] = '\n'; 1971 (void) sendto(s, text, sizeof(text), 0, sa, size); 1972 } 1973 1974 /* 1975 * Return a machine readable date and time, in the form of the 1976 * number of seconds since midnight, Jan 1, 1900. Since gettimeofday 1977 * returns the number of seconds since midnight, Jan 1, 1970, 1978 * we must add 2208988800 seconds to this figure to make up for 1979 * some seventy years Bell Labs was asleep. 1980 */ 1981 1982 uint32_t 1983 machtime() 1984 { 1985 struct timeval tv; 1986 1987 if (gettimeofday(&tv, (struct timezone *)0) < 0) { 1988 if (debug) 1989 fprintf(stderr, "Unable to get time of day\n"); 1990 return (0); 1991 } 1992 #define OFFSET ((uint32_t)25567 * 24*60*60) 1993 return (htonl((uint32_t)(tv.tv_sec + OFFSET))); 1994 #undef OFFSET 1995 } 1996 1997 /* ARGSUSED */ 1998 void 1999 machtime_stream(s, sep) 2000 int s; 2001 struct servtab *sep; 2002 { 2003 uint32_t result; 2004 2005 result = machtime(); 2006 (void) write(s, (char *) &result, sizeof(result)); 2007 } 2008 2009 /* ARGSUSED */ 2010 void 2011 machtime_dg(s, sep) 2012 int s; 2013 struct servtab *sep; 2014 { 2015 uint32_t result; 2016 struct sockaddr_storage ss; 2017 struct sockaddr *sa; 2018 socklen_t size; 2019 2020 sa = (struct sockaddr *)&ss; 2021 size = sizeof(ss); 2022 if (recvfrom(s, (char *)&result, sizeof(result), 0, sa, &size) < 0) 2023 return; 2024 if (!port_good_dg(sa)) 2025 return; 2026 result = machtime(); 2027 (void) sendto(s, (char *) &result, sizeof(result), 0, sa, size); 2028 } 2029 2030 /* ARGSUSED */ 2031 void 2032 daytime_stream(s, sep) /* Return human-readable time of day */ 2033 int s; 2034 struct servtab *sep; 2035 { 2036 char buffer[256]; 2037 time_t clock; 2038 int len; 2039 2040 clock = time((time_t *) 0); 2041 2042 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 2043 (void) write(s, buffer, len); 2044 } 2045 2046 /* ARGSUSED */ 2047 void 2048 daytime_dg(s, sep) /* Return human-readable time of day */ 2049 int s; 2050 struct servtab *sep; 2051 { 2052 char buffer[256]; 2053 time_t clock; 2054 struct sockaddr_storage ss; 2055 struct sockaddr *sa; 2056 socklen_t size; 2057 int len; 2058 2059 clock = time((time_t *) 0); 2060 2061 sa = (struct sockaddr *)&ss; 2062 size = sizeof(ss); 2063 if (recvfrom(s, buffer, sizeof(buffer), 0, sa, &size) < 0) 2064 return; 2065 if (!port_good_dg(sa)) 2066 return; 2067 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 2068 (void) sendto(s, buffer, len, 0, sa, size); 2069 } 2070 2071 /* 2072 * print_service: 2073 * Dump relevant information to stderr 2074 */ 2075 void 2076 print_service(action, sep) 2077 char *action; 2078 struct servtab *sep; 2079 { 2080 2081 if (isrpcservice(sep)) 2082 fprintf(stderr, 2083 "%s: %s rpcprog=%d, rpcvers = %d/%d, proto=%s, wait:max=%d.%d, user:group=%s.%s builtin=%lx server=%s" 2084 #ifdef IPSEC 2085 " policy=\"%s\"" 2086 #endif 2087 "\n", 2088 action, sep->se_service, 2089 sep->se_rpcprog, sep->se_rpcversh, sep->se_rpcversl, sep->se_proto, 2090 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 2091 (long)sep->se_bi, sep->se_server 2092 #ifdef IPSEC 2093 , (sep->se_policy ? sep->se_policy : "") 2094 #endif 2095 ); 2096 else 2097 fprintf(stderr, 2098 "%s: %s proto=%s%s, wait:max=%d.%d, user:group=%s.%s builtin=%lx server=%s" 2099 #ifdef IPSEC 2100 " policy=%s" 2101 #endif 2102 "\n", 2103 action, sep->se_service, 2104 sep->se_type == FAITH_TYPE ? "faith/" : "", 2105 sep->se_proto, 2106 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 2107 (long)sep->se_bi, sep->se_server 2108 #ifdef IPSEC 2109 , (sep->se_policy ? sep->se_policy : "") 2110 #endif 2111 ); 2112 } 2113 2114 void 2115 usage() 2116 { 2117 2118 #ifdef LIBWRAP 2119 (void)fprintf(stderr, "usage: %s [-dl] [conf]\n", getprogname()); 2120 #else 2121 (void)fprintf(stderr, "usage: %s [-d] [conf]\n", getprogname()); 2122 #endif 2123 exit(1); 2124 } 2125 2126 2127 /* 2128 * Based on TCPMUX.C by Mark K. Lottor November 1988 2129 * sri-nic::ps:<mkl>tcpmux.c 2130 */ 2131 2132 static int /* # of characters upto \r,\n or \0 */ 2133 getline(fd, buf, len) 2134 int fd; 2135 char *buf; 2136 int len; 2137 { 2138 int count = 0, n; 2139 2140 do { 2141 n = read(fd, buf, len-count); 2142 if (n == 0) 2143 return (count); 2144 if (n < 0) 2145 return (-1); 2146 while (--n >= 0) { 2147 if (*buf == '\r' || *buf == '\n' || *buf == '\0') 2148 return (count); 2149 count++; 2150 buf++; 2151 } 2152 } while (count < len); 2153 return (count); 2154 } 2155 2156 #define MAX_SERV_LEN (256+2) /* 2 bytes for \r\n */ 2157 2158 #define strwrite(fd, buf) (void) write(fd, buf, sizeof(buf)-1) 2159 2160 void 2161 tcpmux(ctrl, sep) 2162 int ctrl; 2163 struct servtab *sep; 2164 { 2165 char service[MAX_SERV_LEN+1]; 2166 int len; 2167 2168 /* Get requested service name */ 2169 if ((len = getline(ctrl, service, MAX_SERV_LEN)) < 0) { 2170 strwrite(ctrl, "-Error reading service name\r\n"); 2171 goto reject; 2172 } 2173 service[len] = '\0'; 2174 2175 if (debug) 2176 fprintf(stderr, "tcpmux: someone wants %s\n", service); 2177 2178 /* 2179 * Help is a required command, and lists available services, 2180 * one per line. 2181 */ 2182 if (!strcasecmp(service, "help")) { 2183 strwrite(ctrl, "+Available services:\r\n"); 2184 strwrite(ctrl, "help\r\n"); 2185 for (sep = servtab; sep; sep = sep->se_next) { 2186 if (!ISMUX(sep)) 2187 continue; 2188 (void)write(ctrl, sep->se_service, 2189 strlen(sep->se_service)); 2190 strwrite(ctrl, "\r\n"); 2191 } 2192 goto reject; 2193 } 2194 2195 /* Try matching a service in inetd.conf with the request */ 2196 for (sep = servtab; sep; sep = sep->se_next) { 2197 if (!ISMUX(sep)) 2198 continue; 2199 if (!strcasecmp(service, sep->se_service)) { 2200 if (ISMUXPLUS(sep)) 2201 strwrite(ctrl, "+Go\r\n"); 2202 run_service(ctrl, sep); 2203 return; 2204 } 2205 } 2206 strwrite(ctrl, "-Service not available\r\n"); 2207 reject: 2208 _exit(1); 2209 } 2210 2211 #ifdef MULOG 2212 void 2213 dolog(sep, ctrl) 2214 struct servtab *sep; 2215 int ctrl; 2216 { 2217 struct sockaddr_storage ss; 2218 struct sockaddr *sa = (struct sockaddr *)&ss; 2219 socklen_t len = sizeof(ss); 2220 char *host, *dp, buf[BUFSIZ]; 2221 int connected = 1; 2222 2223 switch (sep->se_family) { 2224 case AF_INET: 2225 #ifdef INET6 2226 case AF_INET6: 2227 #endif 2228 break; 2229 default: 2230 return; 2231 } 2232 2233 if (getpeername(ctrl, sa, &len) < 0) { 2234 if (errno != ENOTCONN) { 2235 syslog(LOG_ERR, "getpeername: %m"); 2236 return; 2237 } 2238 if (recvfrom(ctrl, buf, sizeof(buf), MSG_PEEK, sa, &len) < 0) { 2239 syslog(LOG_ERR, "recvfrom: %m"); 2240 return; 2241 } 2242 connected = 0; 2243 } 2244 switch (sa->sa_family) { 2245 case AF_INET: 2246 #ifdef INET6 2247 case AF_INET6: 2248 #endif 2249 break; 2250 default: 2251 syslog(LOG_ERR, "unexpected address family %u", sa->sa_family); 2252 return; 2253 } 2254 2255 if (getnameinfo(sa, len, buf, sizeof(buf), NULL, 0, 0) != 0) 2256 strcpy(buf, "?"); 2257 host = buf; 2258 2259 switch (sep->se_log & ~MULOG_RFC931) { 2260 case 0: 2261 return; 2262 case 1: 2263 if (curdom == NULL || *curdom == '\0') 2264 break; 2265 dp = host + strlen(host) - strlen(curdom); 2266 if (dp < host) 2267 break; 2268 if (debug) 2269 fprintf(stderr, "check \"%s\" against curdom \"%s\"\n", 2270 host, curdom); 2271 if (strcasecmp(dp, curdom) == 0) 2272 return; 2273 break; 2274 case 2: 2275 default: 2276 break; 2277 } 2278 2279 openlog("", LOG_NOWAIT, MULOG); 2280 2281 if (connected && (sep->se_log & MULOG_RFC931)) 2282 syslog(LOG_INFO, "%s@%s wants %s", 2283 rfc931_name(sa, ctrl), host, sep->se_service); 2284 else 2285 syslog(LOG_INFO, "%s wants %s", 2286 host, sep->se_service); 2287 } 2288 2289 /* 2290 * From tcp_log by 2291 * Wietse Venema, Eindhoven University of Technology, The Netherlands. 2292 */ 2293 #if 0 2294 static char sccsid[] = "@(#) rfc931.c 1.3 92/08/31 22:54:46"; 2295 #endif 2296 2297 #include <setjmp.h> 2298 2299 #define RFC931_PORT 113 /* Semi-well-known port */ 2300 #define TIMEOUT 4 2301 #define TIMEOUT2 10 2302 2303 static jmp_buf timebuf; 2304 2305 /* timeout - handle timeouts */ 2306 2307 static void 2308 timeout(sig) 2309 int sig; 2310 { 2311 longjmp(timebuf, sig); 2312 } 2313 2314 /* rfc931_name - return remote user name */ 2315 2316 char * 2317 rfc931_name(there, ctrl) 2318 struct sockaddr *there; /* remote link information */ 2319 int ctrl; 2320 { 2321 struct sockaddr_storage here; /* local link information */ 2322 struct sockaddr_storage sin; /* for talking to RFC931 daemon */ 2323 socklen_t length; 2324 int s; 2325 unsigned remote; 2326 unsigned local; 2327 static char user[256]; /* XXX */ 2328 char buf[256]; 2329 char *cp; 2330 char *result = "USER_UNKNOWN"; 2331 int len; 2332 u_int16_t myport, hisport; 2333 2334 /* Find out local port number of our stdin. */ 2335 2336 length = sizeof(here); 2337 if (getsockname(ctrl, (struct sockaddr *) &here, &length) == -1) { 2338 syslog(LOG_ERR, "getsockname: %m"); 2339 return (result); 2340 } 2341 switch (here.ss_family) { 2342 case AF_INET: 2343 myport = ((struct sockaddr_in *)&here)->sin_port; 2344 break; 2345 #ifdef INET6 2346 case AF_INET6: 2347 myport = ((struct sockaddr_in6 *)&here)->sin6_port; 2348 break; 2349 #endif 2350 } 2351 switch (there->sa_family) { 2352 case AF_INET: 2353 hisport = ((struct sockaddr_in *)&there)->sin_port; 2354 break; 2355 #ifdef INET6 2356 case AF_INET6: 2357 hisport = ((struct sockaddr_in6 *)&there)->sin6_port; 2358 break; 2359 #endif 2360 } 2361 /* Set up timer so we won't get stuck. */ 2362 2363 if ((s = socket(here.ss_family, SOCK_STREAM, 0)) == -1) { 2364 syslog(LOG_ERR, "socket: %m"); 2365 return (result); 2366 } 2367 2368 sin = here; 2369 switch (sin.ss_family) { 2370 case AF_INET: 2371 ((struct sockaddr_in *)&sin)->sin_port = htons(0); 2372 break; 2373 #ifdef INET6 2374 case AF_INET6: 2375 ((struct sockaddr_in6 *)&sin)->sin6_port = htons(0); 2376 break; 2377 #endif 2378 } 2379 if (bind(s, (struct sockaddr *) &sin, sin.ss_len) == -1) { 2380 syslog(LOG_ERR, "bind: %m"); 2381 return (result); 2382 } 2383 2384 signal(SIGALRM, timeout); 2385 if (setjmp(timebuf)) { 2386 close(s); /* not: fclose(fp) */ 2387 return (result); 2388 } 2389 alarm(TIMEOUT); 2390 2391 /* Connect to the RFC931 daemon. */ 2392 2393 memcpy(&sin, there, there->sa_len); 2394 switch (sin.ss_family) { 2395 case AF_INET: 2396 ((struct sockaddr_in *)&sin)->sin_port = htons(RFC931_PORT); 2397 break; 2398 #ifdef INET6 2399 case AF_INET6: 2400 ((struct sockaddr_in6 *)&sin)->sin6_port = htons(RFC931_PORT); 2401 break; 2402 #endif 2403 } 2404 if (connect(s, (struct sockaddr *) &sin, sin.ss_len) == -1) { 2405 close(s); 2406 alarm(0); 2407 return (result); 2408 } 2409 2410 /* Query the RFC 931 server. Would 13-byte writes ever be broken up? */ 2411 (void)snprintf(buf, sizeof buf, "%u,%u\r\n", ntohs(hisport), 2412 ntohs(myport)); 2413 2414 2415 for (len = 0, cp = buf; len < strlen(buf); ) { 2416 int n; 2417 2418 if ((n = write(s, cp, strlen(buf) - len)) == -1) { 2419 close(s); 2420 alarm(0); 2421 return (result); 2422 } 2423 cp += n; 2424 len += n; 2425 } 2426 2427 /* Read response */ 2428 for (cp = buf; cp < buf + sizeof(buf) - 1; ) { 2429 char c; 2430 if (read(s, &c, 1) != 1) { 2431 close(s); 2432 alarm(0); 2433 return (result); 2434 } 2435 if (c == '\n') 2436 break; 2437 *cp++ = c; 2438 } 2439 *cp = '\0'; 2440 2441 if (sscanf(buf, "%u , %u : USERID :%*[^:]:%255s", &remote, &local, user) == 3 2442 && ntohs(hisport) == remote 2443 && ntohs(myport) == local) { 2444 2445 /* Strip trailing carriage return. */ 2446 if ((cp = strchr(user, '\r')) != NULL) 2447 *cp = 0; 2448 result = user; 2449 } 2450 2451 alarm(0); 2452 close(s); 2453 return (result); 2454 } 2455 #endif 2456 2457 /* 2458 * check if the address/port where send data to is one of the obvious ports 2459 * that are used for denial of service attacks like two echo ports 2460 * just echoing data between them 2461 */ 2462 int 2463 port_good_dg(sa) 2464 struct sockaddr *sa; 2465 { 2466 struct in_addr in; 2467 #ifdef INET6 2468 struct in6_addr *in6; 2469 #endif 2470 u_int16_t port; 2471 int i, bad; 2472 char hbuf[NI_MAXHOST]; 2473 2474 bad = 0; 2475 2476 switch (sa->sa_family) { 2477 case AF_INET: 2478 in.s_addr = ntohl(((struct sockaddr_in *)sa)->sin_addr.s_addr); 2479 port = ntohs(((struct sockaddr_in *)sa)->sin_port); 2480 v4chk: 2481 if (IN_MULTICAST(in.s_addr)) 2482 goto bad; 2483 switch ((in.s_addr & 0xff000000) >> 24) { 2484 case 0: case 127: case 255: 2485 goto bad; 2486 } 2487 /* XXX check for subnet broadcast using getifaddrs(3) */ 2488 break; 2489 #ifdef INET6 2490 case AF_INET6: 2491 in6 = &((struct sockaddr_in6 *)sa)->sin6_addr; 2492 port = ntohs(((struct sockaddr_in6 *)sa)->sin6_port); 2493 if (IN6_IS_ADDR_MULTICAST(in6) || IN6_IS_ADDR_UNSPECIFIED(in6)) 2494 goto bad; 2495 if (IN6_IS_ADDR_V4MAPPED(in6) || IN6_IS_ADDR_V4COMPAT(in6)) { 2496 memcpy(&in, &in6->s6_addr[12], sizeof(in)); 2497 in.s_addr = ntohl(in.s_addr); 2498 goto v4chk; 2499 } 2500 break; 2501 #endif 2502 default: 2503 /* XXX unsupported af, is it safe to assume it to be safe? */ 2504 return 1; 2505 } 2506 2507 for (i = 0; bad_ports[i] != 0; i++) { 2508 if (port == bad_ports[i]) 2509 goto bad; 2510 } 2511 2512 return (1); 2513 2514 bad: 2515 if (getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), 2516 NULL, 0, niflags) != 0) 2517 strcpy(hbuf, "?"); 2518 syslog(LOG_WARNING,"Possible DoS attack from %s, Port %d", 2519 hbuf, port); 2520 return (0); 2521 } 2522
Indexes created Thu Sep 25 16:09:42 GMT 2025