faithd.c revision 1.20
1 /* $NetBSD: faithd.c,v 1.20 2001/09/05 01:22:24 itojun Exp $ */ 2 /* $KAME: faithd.c,v 1.40 2001/07/02 14:36:48 itojun Exp $ */ 3 4 /* 5 * Copyright (C) 1997 and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * User level translator from IPv6 to IPv4. 35 * 36 * Usage: faithd [<port> <progpath> <arg1(progname)> <arg2> ...] 37 * e.g. faithd telnet /usr/local/v6/sbin/telnetd telnetd 38 */ 39 #define HAVE_GETIFADDRS 40 41 #include <sys/param.h> 42 #include <sys/types.h> 43 #include <sys/sysctl.h> 44 #include <sys/socket.h> 45 #include <sys/wait.h> 46 #include <sys/stat.h> 47 #include <sys/time.h> 48 #include <sys/ioctl.h> 49 #ifdef __FreeBSD__ 50 #include <libutil.h> 51 #endif 52 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <stdarg.h> 56 #include <string.h> 57 #include <syslog.h> 58 #include <unistd.h> 59 #include <errno.h> 60 #include <signal.h> 61 #include <fcntl.h> 62 #include <termios.h> 63 64 #include <net/if_types.h> 65 #ifdef IFT_FAITH 66 # define USE_ROUTE 67 # include <net/if.h> 68 # include <net/route.h> 69 # include <net/if_dl.h> 70 #endif 71 72 #include <netinet/in.h> 73 #include <arpa/inet.h> 74 #include <netdb.h> 75 #ifdef HAVE_GETIFADDRS 76 #include <ifaddrs.h> 77 #endif 78 79 #ifdef FAITH4 80 #include <resolv.h> 81 #include <arpa/nameser.h> 82 #ifndef FAITH_NS 83 #define FAITH_NS "FAITH_NS" 84 #endif 85 #endif 86 87 #include "faithd.h" 88 #include "prefix.h" 89 90 char *serverpath = NULL; 91 char *serverarg[MAXARGV + 1]; 92 static char *faithdname = NULL; 93 char logname[BUFSIZ]; 94 char procname[BUFSIZ]; 95 struct myaddrs { 96 struct myaddrs *next; 97 struct sockaddr *addr; 98 }; 99 struct myaddrs *myaddrs = NULL; 100 static const char *service; 101 #ifdef USE_ROUTE 102 static int sockfd = 0; 103 #endif 104 int dflag = 0; 105 static int pflag = 0; 106 static int inetd = 0; 107 static char *configfile = NULL; 108 109 int main __P((int, char **)); 110 static int inetd_main __P((int, char **)); 111 static int daemon_main __P((int, char **)); 112 static void play_service __P((int)); 113 static void play_child __P((int, struct sockaddr *)); 114 static int faith_prefix __P((struct sockaddr *)); 115 static int map6to4 __P((struct sockaddr_in6 *, struct sockaddr_in *)); 116 #ifdef FAITH4 117 static int map4to6 __P((struct sockaddr_in *, struct sockaddr_in6 *)); 118 #endif 119 static void sig_child __P((int)); 120 static void sig_terminate __P((int)); 121 static void start_daemon __P((void)); 122 static void exit_stderr __P((const char *, ...)) 123 __attribute__((__format__(__printf__, 1, 2))); 124 #ifndef HAVE_GETIFADDRS 125 static unsigned int if_maxindex __P((void)); 126 #endif 127 static void grab_myaddrs __P((void)); 128 static void free_myaddrs __P((void)); 129 static void update_myaddrs __P((void)); 130 static void usage __P((void)); 131 132 int 133 main(int argc, char **argv) 134 { 135 136 /* 137 * Initializing stuff 138 */ 139 140 faithdname = strrchr(argv[0], '/'); 141 if (faithdname) 142 faithdname++; 143 else 144 faithdname = argv[0]; 145 146 if (strcmp(faithdname, "faithd") != 0) { 147 inetd = 1; 148 return inetd_main(argc, argv); 149 } else 150 return daemon_main(argc, argv); 151 } 152 153 static int 154 inetd_main(int argc, char **argv) 155 { 156 char path[MAXPATHLEN]; 157 struct sockaddr_storage me; 158 struct sockaddr_storage from; 159 int melen, fromlen; 160 int i; 161 int error; 162 const int on = 1; 163 char sbuf[NI_MAXSERV], snum[NI_MAXSERV]; 164 165 if (config_load(configfile) < 0 && configfile) { 166 exit_failure("could not load config file"); 167 /*NOTREACHED*/ 168 } 169 170 if (strrchr(argv[0], '/') == NULL) 171 snprintf(path, sizeof(path), "%s/%s", DEFAULT_DIR, argv[0]); 172 else 173 snprintf(path, sizeof(path), "%s", argv[0]); 174 175 #ifdef USE_ROUTE 176 grab_myaddrs(); 177 178 sockfd = socket(PF_ROUTE, SOCK_RAW, PF_UNSPEC); 179 if (sockfd < 0) { 180 exit_failure("socket(PF_ROUTE): %s", strerror(errno)); 181 /*NOTREACHED*/ 182 } 183 #endif 184 185 melen = sizeof(me); 186 if (getsockname(STDIN_FILENO, (struct sockaddr *)&me, &melen) < 0) { 187 exit_failure("getsockname: %s", strerror(errno)); 188 /*NOTREACHED*/ 189 } 190 fromlen = sizeof(from); 191 if (getpeername(STDIN_FILENO, (struct sockaddr *)&from, &fromlen) < 0) { 192 exit_failure("getpeername: %s", strerror(errno)); 193 /*NOTREACHED*/ 194 } 195 if (getnameinfo((struct sockaddr *)&me, melen, NULL, 0, 196 sbuf, sizeof(sbuf), NI_NUMERICHOST) == 0) 197 service = sbuf; 198 else 199 service = DEFAULT_PORT_NAME; 200 if (getnameinfo((struct sockaddr *)&me, melen, NULL, 0, 201 snum, sizeof(snum), NI_NUMERICHOST) != 0) 202 snprintf(snum, sizeof(snum), "?"); 203 204 snprintf(logname, sizeof(logname), "faithd %s", snum); 205 snprintf(procname, sizeof(procname), "accepting port %s", snum); 206 openlog(logname, LOG_PID | LOG_NOWAIT, LOG_DAEMON); 207 208 if (argc >= MAXARGV) { 209 exit_failure("too many arguments"); 210 /*NOTREACHED*/ 211 } 212 serverarg[0] = serverpath = path; 213 for (i = 1; i < argc; i++) 214 serverarg[i] = argv[i]; 215 serverarg[i] = NULL; 216 217 error = setsockopt(STDIN_FILENO, SOL_SOCKET, SO_OOBINLINE, &on, 218 sizeof(on)); 219 if (error < 0) { 220 exit_failure("setsockopt(SO_OOBINLINE): %s", strerror(errno)); 221 /*NOTREACHED*/ 222 } 223 224 play_child(STDIN_FILENO, (struct sockaddr *)&from); 225 exit_failure("should not reach here"); 226 return 0; /*dummy!*/ 227 } 228 229 static int 230 daemon_main(int argc, char **argv) 231 { 232 struct addrinfo hints, *res; 233 int s_wld, error, i, serverargc, on = 1; 234 int family = AF_INET6; 235 int c; 236 #ifdef FAITH_NS 237 char *ns; 238 #endif /* FAITH_NS */ 239 240 while ((c = getopt(argc, argv, "df:p46")) != -1) { 241 switch (c) { 242 case 'd': 243 dflag++; 244 break; 245 case 'f': 246 configfile = optarg; 247 break; 248 case 'p': 249 pflag++; 250 break; 251 #ifdef FAITH4 252 case '4': 253 family = AF_INET; 254 break; 255 case '6': 256 family = AF_INET6; 257 break; 258 #endif 259 default: 260 usage(); 261 /*NOTREACHED*/ 262 } 263 } 264 argc -= optind; 265 argv += optind; 266 267 if (config_load(configfile) < 0 && configfile) { 268 exit_failure("could not load config file"); 269 /*NOTREACHED*/ 270 } 271 272 #ifdef FAITH_NS 273 if ((ns = getenv(FAITH_NS)) != NULL) { 274 struct sockaddr_storage ss; 275 struct addrinfo hints, *res; 276 char serv[NI_MAXSERV]; 277 278 memset(&ss, 0, sizeof(ss)); 279 memset(&hints, 0, sizeof(hints)); 280 snprintf(serv, sizeof(serv), "%u", NAMESERVER_PORT); 281 hints.ai_flags = AI_NUMERICHOST; 282 if (getaddrinfo(ns, serv, &hints, &res) == 0) { 283 res_init(); 284 memcpy(&_res_ext.nsaddr, res->ai_addr, res->ai_addrlen); 285 _res.nscount = 1; 286 } 287 } 288 #endif /* FAITH_NS */ 289 290 #ifdef USE_ROUTE 291 grab_myaddrs(); 292 #endif 293 294 switch (argc) { 295 case 0: 296 usage(); 297 /*NOTREACHED*/ 298 default: 299 serverargc = argc - NUMARG; 300 if (serverargc >= MAXARGV) 301 exit_stderr("too many arguments"); 302 303 serverpath = malloc(strlen(argv[NUMPRG]) + 1); 304 strcpy(serverpath, argv[NUMPRG]); 305 for (i = 0; i < serverargc; i++) { 306 serverarg[i] = malloc(strlen(argv[i + NUMARG]) + 1); 307 strcpy(serverarg[i], argv[i + NUMARG]); 308 } 309 serverarg[i] = NULL; 310 /* fall throuth */ 311 case 1: /* no local service */ 312 service = argv[NUMPRT]; 313 break; 314 } 315 316 /* 317 * Opening wild card socket for this service. 318 */ 319 320 memset(&hints, 0, sizeof(hints)); 321 hints.ai_flags = AI_PASSIVE; 322 hints.ai_family = family; 323 hints.ai_socktype = SOCK_STREAM; 324 hints.ai_protocol = 0; 325 error = getaddrinfo(NULL, service, &hints, &res); 326 if (error) 327 exit_stderr("getaddrinfo: %s", gai_strerror(error)); 328 329 s_wld = socket(res->ai_family, res->ai_socktype, res->ai_protocol); 330 if (s_wld == -1) 331 exit_stderr("socket: %s", strerror(errno)); 332 333 #ifdef IPV6_FAITH 334 if (res->ai_family == AF_INET6) { 335 error = setsockopt(s_wld, IPPROTO_IPV6, IPV6_FAITH, &on, sizeof(on)); 336 if (error == -1) 337 exit_stderr("setsockopt(IPV6_FAITH): %s", 338 strerror(errno)); 339 } 340 #endif 341 #ifdef FAITH4 342 #ifdef IP_FAITH 343 if (res->ai_family == AF_INET) { 344 error = setsockopt(s_wld, IPPROTO_IP, IP_FAITH, &on, sizeof(on)); 345 if (error == -1) 346 exit_stderr("setsockopt(IP_FAITH): %s", 347 strerror(errno)); 348 } 349 #endif 350 #endif /* FAITH4 */ 351 352 error = setsockopt(s_wld, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); 353 if (error == -1) 354 exit_stderr("setsockopt(SO_REUSEADDR): %s", strerror(errno)); 355 356 error = setsockopt(s_wld, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)); 357 if (error == -1) 358 exit_stderr("setsockopt(SO_OOBINLINE): %s", strerror(errno)); 359 360 error = bind(s_wld, (struct sockaddr *)res->ai_addr, res->ai_addrlen); 361 if (error == -1) 362 exit_stderr("bind: %s", strerror(errno)); 363 364 error = listen(s_wld, 5); 365 if (error == -1) 366 exit_stderr("listen: %s", strerror(errno)); 367 368 #ifdef USE_ROUTE 369 sockfd = socket(PF_ROUTE, SOCK_RAW, PF_UNSPEC); 370 if (sockfd < 0) { 371 exit_stderr("socket(PF_ROUTE): %s", strerror(errno)); 372 /*NOTREACHED*/ 373 } 374 #endif 375 376 /* 377 * Everything is OK. 378 */ 379 380 start_daemon(); 381 382 snprintf(logname, sizeof(logname), "faithd %s", service); 383 snprintf(procname, sizeof(procname), "accepting port %s", service); 384 openlog(logname, LOG_PID | LOG_NOWAIT, LOG_DAEMON); 385 syslog(LOG_INFO, "Staring faith daemon for %s port", service); 386 387 play_service(s_wld); 388 /* NOTREACHED */ 389 exit(1); /*pacify gcc*/ 390 } 391 392 static void 393 play_service(int s_wld) 394 { 395 struct sockaddr_storage srcaddr; 396 int len; 397 int s_src; 398 pid_t child_pid; 399 fd_set rfds; 400 int error; 401 int maxfd; 402 403 /* 404 * Wait, accept, fork, faith.... 405 */ 406 again: 407 setproctitle("%s", procname); 408 409 FD_ZERO(&rfds); 410 FD_SET(s_wld, &rfds); 411 maxfd = s_wld; 412 #ifdef USE_ROUTE 413 if (sockfd) { 414 FD_SET(sockfd, &rfds); 415 maxfd = (maxfd < sockfd) ? sockfd : maxfd; 416 } 417 #endif 418 419 error = select(maxfd + 1, &rfds, NULL, NULL, NULL); 420 if (error < 0) { 421 if (errno == EINTR) 422 goto again; 423 exit_failure("select: %s", strerror(errno)); 424 /*NOTREACHED*/ 425 } 426 427 #ifdef USE_ROUTE 428 if (FD_ISSET(sockfd, &rfds)) { 429 update_myaddrs(); 430 } 431 #endif 432 if (FD_ISSET(s_wld, &rfds)) { 433 len = sizeof(srcaddr); 434 s_src = accept(s_wld, (struct sockaddr *)&srcaddr, 435 &len); 436 if (s_src == -1) { 437 exit_failure("socket: %s", strerror(errno)); 438 /*NOTREACHED*/ 439 } 440 441 child_pid = fork(); 442 443 if (child_pid == 0) { 444 /* child process */ 445 close(s_wld); 446 closelog(); 447 openlog(logname, LOG_PID | LOG_NOWAIT, LOG_DAEMON); 448 play_child(s_src, (struct sockaddr *)&srcaddr); 449 exit_failure("should never reach here"); 450 /*NOTREACHED*/ 451 } else { 452 /* parent process */ 453 close(s_src); 454 if (child_pid == -1) 455 syslog(LOG_ERR, "can't fork"); 456 } 457 } 458 goto again; 459 } 460 461 static void 462 play_child(int s_src, struct sockaddr *srcaddr) 463 { 464 struct sockaddr_storage dstaddr6; 465 struct sockaddr_storage dstaddr4; 466 char src[MAXHOSTNAMELEN]; 467 char dst6[MAXHOSTNAMELEN]; 468 char dst4[MAXHOSTNAMELEN]; 469 int len = sizeof(dstaddr6); 470 int s_dst, error, hport, nresvport, on = 1; 471 struct timeval tv; 472 struct sockaddr *sa4; 473 const struct config *conf; 474 475 tv.tv_sec = 1; 476 tv.tv_usec = 0; 477 478 getnameinfo(srcaddr, srcaddr->sa_len, 479 src, sizeof(src), NULL, 0, NI_NUMERICHOST); 480 syslog(LOG_INFO, "accepted a client from %s", src); 481 482 error = getsockname(s_src, (struct sockaddr *)&dstaddr6, &len); 483 if (error == -1) { 484 exit_failure("getsockname: %s", strerror(errno)); 485 /*NOTREACHED*/ 486 } 487 488 getnameinfo((struct sockaddr *)&dstaddr6, len, 489 dst6, sizeof(dst6), NULL, 0, NI_NUMERICHOST); 490 syslog(LOG_INFO, "the client is connecting to %s", dst6); 491 492 if (!faith_prefix((struct sockaddr *)&dstaddr6)) { 493 if (serverpath) { 494 /* 495 * Local service 496 */ 497 syslog(LOG_INFO, "executing local %s", serverpath); 498 if (!inetd) { 499 dup2(s_src, 0); 500 close(s_src); 501 dup2(0, 1); 502 dup2(0, 2); 503 } 504 execv(serverpath, serverarg); 505 syslog(LOG_ERR, "execv %s: %s", serverpath, 506 strerror(errno)); 507 _exit(EXIT_FAILURE); 508 } else { 509 close(s_src); 510 exit_success("no local service for %s", service); 511 } 512 } 513 514 /* 515 * Act as a translator 516 */ 517 518 switch (((struct sockaddr *)&dstaddr6)->sa_family) { 519 case AF_INET6: 520 if (!map6to4((struct sockaddr_in6 *)&dstaddr6, 521 (struct sockaddr_in *)&dstaddr4)) { 522 close(s_src); 523 exit_failure("map6to4 failed"); 524 /*NOTREACHED*/ 525 } 526 syslog(LOG_INFO, "translating from v6 to v4"); 527 break; 528 #ifdef FAITH4 529 case AF_INET: 530 if (!map4to6((struct sockaddr_in *)&dstaddr6, 531 (struct sockaddr_in6 *)&dstaddr4)) { 532 close(s_src); 533 exit_failure("map4to6 failed"); 534 /*NOTREACHED*/ 535 } 536 syslog(LOG_INFO, "translating from v4 to v6"); 537 break; 538 #endif 539 default: 540 close(s_src); 541 exit_failure("family not supported"); 542 /*NOTREACHED*/ 543 } 544 545 sa4 = (struct sockaddr *)&dstaddr4; 546 getnameinfo(sa4, sa4->sa_len, 547 dst4, sizeof(dst4), NULL, 0, NI_NUMERICHOST); 548 549 conf = config_match(srcaddr, sa4); 550 if (!conf || !conf->permit) { 551 close(s_src); 552 if (conf) { 553 exit_failure("translation to %s not permitted for %s", 554 dst4, prefix_string(&conf->match)); 555 /*NOTREACHED*/ 556 } else { 557 exit_failure("translation to %s not permitted", dst4); 558 /*NOTREACHED*/ 559 } 560 } 561 562 syslog(LOG_INFO, "the translator is connecting to %s", dst4); 563 564 setproctitle("port %s, %s -> %s", service, src, dst4); 565 566 if (sa4->sa_family == AF_INET6) 567 hport = ntohs(((struct sockaddr_in6 *)&dstaddr4)->sin6_port); 568 else /* AF_INET */ 569 hport = ntohs(((struct sockaddr_in *)&dstaddr4)->sin_port); 570 571 switch (hport) { 572 case RLOGIN_PORT: 573 case RSH_PORT: 574 s_dst = rresvport_af(&nresvport, sa4->sa_family); 575 break; 576 default: 577 if (pflag) 578 s_dst = rresvport_af(&nresvport, sa4->sa_family); 579 else 580 s_dst = socket(sa4->sa_family, SOCK_STREAM, 0); 581 break; 582 } 583 if (s_dst < 0) { 584 exit_failure("socket: %s", strerror(errno)); 585 /*NOTREACHED*/ 586 } 587 588 if (conf->src.a.ss_family) { 589 if (bind(s_dst, (const struct sockaddr *)&conf->src.a, 590 conf->src.a.ss_len) < 0) { 591 exit_failure("bind: %s", strerror(errno)); 592 /*NOTREACHED*/ 593 } 594 } 595 596 error = setsockopt(s_dst, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)); 597 if (error < 0) { 598 exit_failure("setsockopt(SO_OOBINLINE): %s", strerror(errno)); 599 /*NOTREACHED*/ 600 } 601 602 error = setsockopt(s_src, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv)); 603 if (error < 0) { 604 exit_failure("setsockopt(SO_SNDTIMEO): %s", strerror(errno)); 605 /*NOTREACHED*/ 606 } 607 error = setsockopt(s_dst, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv)); 608 if (error < 0) { 609 exit_failure("setsockopt(SO_SNDTIMEO): %s", strerror(errno)); 610 /*NOTREACHED*/ 611 } 612 613 error = connect(s_dst, sa4, sa4->sa_len); 614 if (error < 0) { 615 exit_failure("connect: %s", strerror(errno)); 616 /*NOTREACHED*/ 617 } 618 619 switch (hport) { 620 case FTP_PORT: 621 ftp_relay(s_src, s_dst); 622 break; 623 case RSH_PORT: 624 syslog(LOG_WARNING, 625 "WARINNG: it is insecure to relay rsh port"); 626 rsh_relay(s_src, s_dst); 627 break; 628 case RLOGIN_PORT: 629 syslog(LOG_WARNING, 630 "WARINNG: it is insecure to relay rlogin port"); 631 /*FALLTHROUGH*/ 632 default: 633 tcp_relay(s_src, s_dst, service); 634 break; 635 } 636 637 /* NOTREACHED */ 638 } 639 640 /* 0: non faith, 1: faith */ 641 static int 642 faith_prefix(struct sockaddr *dst) 643 { 644 #ifndef USE_ROUTE 645 int mib[4], size; 646 struct in6_addr faith_prefix; 647 struct sockaddr_in6 *dst6 = (struct sockaddr_in *)dst; 648 649 if (dst->sa_family != AF_INET6) 650 return 0; 651 652 mib[0] = CTL_NET; 653 mib[1] = PF_INET6; 654 mib[2] = IPPROTO_IPV6; 655 mib[3] = IPV6CTL_FAITH_PREFIX; 656 size = sizeof(struct in6_addr); 657 if (sysctl(mib, 4, &faith_prefix, &size, NULL, 0) < 0) { 658 exit_failure("sysctl: %s", strerror(errno)); 659 /*NOTREACHED*/ 660 } 661 662 if (memcmp(dst, &faith_prefix, 663 sizeof(struct in6_addr) - sizeof(struct in_addr) == 0) { 664 return 1; 665 } 666 return 0; 667 #else 668 struct myaddrs *p; 669 struct sockaddr_in6 *sin6; 670 struct sockaddr_in *sin4; 671 struct sockaddr_in6 *dst6; 672 struct sockaddr_in *dst4; 673 struct sockaddr_in dstmap; 674 675 dst6 = (struct sockaddr_in6 *)dst; 676 if (dst->sa_family == AF_INET6 677 && IN6_IS_ADDR_V4MAPPED(&dst6->sin6_addr)) { 678 /* ugly... */ 679 memset(&dstmap, 0, sizeof(dstmap)); 680 dstmap.sin_family = AF_INET; 681 dstmap.sin_len = sizeof(dstmap); 682 memcpy(&dstmap.sin_addr, &dst6->sin6_addr.s6_addr[12], 683 sizeof(dstmap.sin_addr)); 684 dst = (struct sockaddr *)&dstmap; 685 } 686 687 dst6 = (struct sockaddr_in6 *)dst; 688 dst4 = (struct sockaddr_in *)dst; 689 690 for (p = myaddrs; p; p = p->next) { 691 sin6 = (struct sockaddr_in6 *)p->addr; 692 sin4 = (struct sockaddr_in *)p->addr; 693 694 if (p->addr->sa_len != dst->sa_len 695 || p->addr->sa_family != dst->sa_family) 696 continue; 697 698 switch (dst->sa_family) { 699 case AF_INET6: 700 if (sin6->sin6_scope_id == dst6->sin6_scope_id 701 && IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &dst6->sin6_addr)) 702 return 0; 703 break; 704 case AF_INET: 705 if (sin4->sin_addr.s_addr == dst4->sin_addr.s_addr) 706 return 0; 707 break; 708 } 709 } 710 return 1; 711 #endif 712 } 713 714 /* 0: non faith, 1: faith */ 715 static int 716 map6to4(struct sockaddr_in6 *dst6, struct sockaddr_in *dst4) 717 { 718 memset(dst4, 0, sizeof(*dst4)); 719 dst4->sin_len = sizeof(*dst4); 720 dst4->sin_family = AF_INET; 721 dst4->sin_port = dst6->sin6_port; 722 memcpy(&dst4->sin_addr, &dst6->sin6_addr.s6_addr[12], 723 sizeof(dst4->sin_addr)); 724 725 if (dst4->sin_addr.s_addr == INADDR_ANY 726 || dst4->sin_addr.s_addr == INADDR_BROADCAST 727 || IN_MULTICAST(ntohl(dst4->sin_addr.s_addr))) 728 return 0; 729 730 return 1; 731 } 732 733 #ifdef FAITH4 734 /* 0: non faith, 1: faith */ 735 static int 736 map4to6(struct sockaddr_in *dst4, struct sockaddr_in6 *dst6) 737 { 738 char host[NI_MAXHOST]; 739 char serv[NI_MAXSERV]; 740 struct addrinfo hints, *res; 741 int ai_errno; 742 743 if (getnameinfo((struct sockaddr *)dst4, dst4->sin_len, host, sizeof(host), 744 serv, sizeof(serv), NI_NAMEREQD|NI_NUMERICSERV) != 0) 745 return 0; 746 747 memset(&hints, 0, sizeof(hints)); 748 hints.ai_flags = 0; 749 hints.ai_family = AF_INET6; 750 hints.ai_socktype = SOCK_STREAM; 751 hints.ai_protocol = 0; 752 753 if ((ai_errno = getaddrinfo(host, serv, &hints, &res)) != 0) { 754 syslog(LOG_INFO, "%s %s: %s", host, serv, 755 gai_strerror(ai_errno)); 756 return 0; 757 } 758 759 memcpy(dst6, res->ai_addr, res->ai_addrlen); 760 761 freeaddrinfo(res); 762 763 return 1; 764 } 765 #endif /* FAITH4 */ 766 767 static void 768 sig_child(int sig) 769 { 770 int status; 771 pid_t pid; 772 773 pid = wait3(&status, WNOHANG, (struct rusage *)0); 774 if (pid && WEXITSTATUS(status)) 775 syslog(LOG_WARNING, "child %d exit status 0x%x", pid, status); 776 } 777 778 void 779 sig_terminate(int sig) 780 { 781 syslog(LOG_INFO, "Terminating faith daemon"); 782 exit(EXIT_SUCCESS); 783 } 784 785 static void 786 start_daemon(void) 787 { 788 #ifdef SA_NOCLDWAIT 789 struct sigaction sa; 790 #endif 791 792 if (daemon(0, 0) == -1) 793 exit_stderr("daemon: %s", strerror(errno)); 794 795 #ifdef SA_NOCLDWAIT 796 memset(&sa, 0, sizeof(sa)); 797 sa.sa_handler = sig_child; 798 sa.sa_flags = SA_NOCLDWAIT; 799 sigemptyset(&sa.sa_mask); 800 sigaction(SIGCHLD, &sa, (struct sigaction *)0); 801 #else 802 if (signal(SIGCHLD, sig_child) == SIG_ERR) { 803 exit_failure("signal CHLD: %s", strerror(errno)); 804 /*NOTREACHED*/ 805 } 806 #endif 807 808 if (signal(SIGTERM, sig_terminate) == SIG_ERR) { 809 exit_failure("signal TERM: %s", strerror(errno)); 810 /*NOTREACHED*/ 811 } 812 } 813 814 static void 815 exit_stderr(const char *fmt, ...) 816 { 817 va_list ap; 818 char buf[BUFSIZ]; 819 820 va_start(ap, fmt); 821 vsnprintf(buf, sizeof(buf), fmt, ap); 822 va_end(ap); 823 fprintf(stderr, "%s\n", buf); 824 exit(EXIT_FAILURE); 825 } 826 827 void 828 exit_failure(const char *fmt, ...) 829 { 830 va_list ap; 831 char buf[BUFSIZ]; 832 833 va_start(ap, fmt); 834 vsnprintf(buf, sizeof(buf), fmt, ap); 835 va_end(ap); 836 syslog(LOG_ERR, "%s", buf); 837 exit(EXIT_FAILURE); 838 } 839 840 void 841 exit_success(const char *fmt, ...) 842 { 843 va_list ap; 844 char buf[BUFSIZ]; 845 846 va_start(ap, fmt); 847 vsnprintf(buf, sizeof(buf), fmt, ap); 848 va_end(ap); 849 syslog(LOG_INFO, "%s", buf); 850 exit(EXIT_SUCCESS); 851 } 852 853 #ifdef USE_ROUTE 854 #ifndef HAVE_GETIFADDRS 855 static unsigned int 856 if_maxindex() 857 { 858 struct if_nameindex *p, *p0; 859 unsigned int max = 0; 860 861 p0 = if_nameindex(); 862 for (p = p0; p && p->if_index && p->if_name; p++) { 863 if (max < p->if_index) 864 max = p->if_index; 865 } 866 if_freenameindex(p0); 867 return max; 868 } 869 #endif 870 871 static void 872 grab_myaddrs() 873 { 874 #ifdef HAVE_GETIFADDRS 875 struct ifaddrs *ifap, *ifa; 876 struct myaddrs *p; 877 struct sockaddr_in6 *sin6; 878 879 if (getifaddrs(&ifap) != 0) { 880 exit_failure("getifaddrs"); 881 /*NOTREACHED*/ 882 } 883 884 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 885 switch (ifa->ifa_addr->sa_family) { 886 case AF_INET: 887 case AF_INET6: 888 break; 889 default: 890 continue; 891 } 892 893 p = (struct myaddrs *)malloc(sizeof(struct myaddrs) + 894 ifa->ifa_addr->sa_len); 895 if (!p) { 896 exit_failure("not enough core"); 897 /*NOTREACHED*/ 898 } 899 memcpy(p + 1, ifa->ifa_addr, ifa->ifa_addr->sa_len); 900 p->next = myaddrs; 901 p->addr = (struct sockaddr *)(p + 1); 902 #ifdef __KAME__ 903 if (ifa->ifa_addr->sa_family == AF_INET6) { 904 sin6 = (struct sockaddr_in6 *)p->addr; 905 if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) 906 || IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) { 907 sin6->sin6_scope_id = 908 ntohs(*(u_int16_t *)&sin6->sin6_addr.s6_addr[2]); 909 sin6->sin6_addr.s6_addr[2] = 0; 910 sin6->sin6_addr.s6_addr[3] = 0; 911 } 912 } 913 #endif 914 myaddrs = p; 915 if (dflag) { 916 char hbuf[NI_MAXHOST]; 917 getnameinfo(p->addr, p->addr->sa_len, 918 hbuf, sizeof(hbuf), NULL, 0, 919 NI_NUMERICHOST); 920 syslog(LOG_INFO, "my interface: %s %s", hbuf, 921 ifa->ifa_name); 922 } 923 } 924 925 freeifaddrs(ifap); 926 #else 927 int s; 928 unsigned int maxif; 929 struct ifreq *iflist; 930 struct ifconf ifconf; 931 struct ifreq *ifr, *ifrp, *ifr_end; 932 struct myaddrs *p; 933 struct sockaddr_in6 *sin6; 934 size_t siz; 935 char ifrbuf[sizeof(struct ifreq) + 1024]; 936 937 maxif = if_maxindex() + 1; 938 iflist = (struct ifreq *)malloc(maxif * BUFSIZ); /* XXX */ 939 if (!iflist) { 940 exit_failure("not enough core"); 941 /*NOTREACHED*/ 942 } 943 944 if ((s = socket(PF_INET, SOCK_DGRAM, 0)) < 0) { 945 exit_failure("socket(SOCK_DGRAM)"); 946 /*NOTREACHED*/ 947 } 948 memset(&ifconf, 0, sizeof(ifconf)); 949 ifconf.ifc_req = iflist; 950 ifconf.ifc_len = maxif * BUFSIZ; /* XXX */ 951 if (ioctl(s, SIOCGIFCONF, &ifconf) < 0) { 952 exit_failure("ioctl(SIOCGIFCONF)"); 953 /*NOTREACHED*/ 954 } 955 close(s); 956 957 /* Look for this interface in the list */ 958 ifr_end = (struct ifreq *) (ifconf.ifc_buf + ifconf.ifc_len); 959 for (ifrp = ifconf.ifc_req; 960 ifrp < ifr_end; 961 ifrp = (struct ifreq *)((char *)ifrp + siz)) { 962 memcpy(ifrbuf, ifrp, sizeof(*ifrp)); 963 ifr = (struct ifreq *)ifrbuf; 964 siz = ifr->ifr_addr.sa_len; 965 if (siz < sizeof(ifr->ifr_addr)) 966 siz = sizeof(ifr->ifr_addr); 967 siz += (sizeof(*ifrp) - sizeof(ifr->ifr_addr)); 968 if (siz > sizeof(ifrbuf)) { 969 /* ifr too big */ 970 break; 971 } 972 memcpy(ifrbuf, ifrp, siz); 973 974 switch (ifr->ifr_addr.sa_family) { 975 case AF_INET: 976 case AF_INET6: 977 p = (struct myaddrs *)malloc(sizeof(struct myaddrs) 978 + ifr->ifr_addr.sa_len); 979 if (!p) { 980 exit_failure("not enough core"); 981 /*NOTREACHED*/ 982 } 983 memcpy(p + 1, &ifr->ifr_addr, ifr->ifr_addr.sa_len); 984 p->next = myaddrs; 985 p->addr = (struct sockaddr *)(p + 1); 986 #ifdef __KAME__ 987 if (ifr->ifr_addr.sa_family == AF_INET6) { 988 sin6 = (struct sockaddr_in6 *)p->addr; 989 if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) 990 || IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) { 991 sin6->sin6_scope_id = 992 ntohs(*(u_int16_t *)&sin6->sin6_addr.s6_addr[2]); 993 sin6->sin6_addr.s6_addr[2] = 0; 994 sin6->sin6_addr.s6_addr[3] = 0; 995 } 996 } 997 #endif 998 myaddrs = p; 999 if (dflag) { 1000 char hbuf[NI_MAXHOST]; 1001 getnameinfo(p->addr, p->addr->sa_len, 1002 hbuf, sizeof(hbuf), NULL, 0, 1003 NI_NUMERICHOST); 1004 syslog(LOG_INFO, "my interface: %s %s", hbuf, ifr->ifr_name); 1005 } 1006 break; 1007 default: 1008 break; 1009 } 1010 } 1011 1012 free(iflist); 1013 #endif 1014 } 1015 1016 static void 1017 free_myaddrs() 1018 { 1019 struct myaddrs *p, *q; 1020 1021 p = myaddrs; 1022 while (p) { 1023 q = p->next; 1024 free(p); 1025 p = q; 1026 } 1027 myaddrs = NULL; 1028 } 1029 1030 static void 1031 update_myaddrs() 1032 { 1033 char msg[BUFSIZ]; 1034 int len; 1035 struct rt_msghdr *rtm; 1036 1037 len = read(sockfd, msg, sizeof(msg)); 1038 if (len < 0) { 1039 syslog(LOG_ERR, "read(PF_ROUTE) failed"); 1040 return; 1041 } 1042 rtm = (struct rt_msghdr *)msg; 1043 if (len < 4 || len < rtm->rtm_msglen) { 1044 syslog(LOG_ERR, "read(PF_ROUTE) short read"); 1045 return; 1046 } 1047 if (rtm->rtm_version != RTM_VERSION) { 1048 syslog(LOG_ERR, "routing socket version mismatch"); 1049 close(sockfd); 1050 sockfd = 0; 1051 return; 1052 } 1053 switch (rtm->rtm_type) { 1054 case RTM_NEWADDR: 1055 case RTM_DELADDR: 1056 case RTM_IFINFO: 1057 break; 1058 default: 1059 return; 1060 } 1061 /* XXX more filters here? */ 1062 1063 syslog(LOG_INFO, "update interface address list"); 1064 free_myaddrs(); 1065 grab_myaddrs(); 1066 } 1067 #endif /*USE_ROUTE*/ 1068 1069 static void 1070 usage() 1071 { 1072 fprintf(stderr, "usage: %s [-dp] [-f conf] service [serverpath [serverargs]]\n", 1073 faithdname); 1074 exit(0); 1075 } 1076
Indexes created Wed Oct 01 07:09:59 GMT 2025