1 /* $OpenBSD: getaddrinfo_async.c,v 1.59 2022/12/27 17:10:06 jmc Exp $ */ 2 /* 3 * Copyright (c) 2012 Eric Faurot <eric@openbsd.org> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 #include <sys/types.h> 19 #include <sys/socket.h> 20 #include <sys/uio.h> 21 #include <netinet/in.h> 22 #include <arpa/nameser.h> 23 #include <net/if.h> 24 #include <netdb.h> 25 26 #include <asr.h> 27 #include <errno.h> 28 #include <ifaddrs.h> 29 #include <resolv.h> 30 #include <stdlib.h> 31 #include <string.h> 32 #include <unistd.h> 33 #include <limits.h> 34 35 #include "asr_private.h" 36 37 struct match { 38 int family; 39 int socktype; 40 int protocol; 41 }; 42 43 static int getaddrinfo_async_run(struct asr_query *, struct asr_result *); 44 static int get_port(const char *, const char *, int); 45 static int iter_family(struct asr_query *, int); 46 static int addrinfo_add(struct asr_query *, const struct sockaddr *, const char *); 47 static int addrinfo_from_file(struct asr_query *, int, FILE *); 48 static int addrinfo_from_pkt(struct asr_query *, char *, size_t); 49 static int addrconfig_setup(struct asr_query *); 50 51 static const struct match matches[] = { 52 { PF_INET, SOCK_DGRAM, IPPROTO_UDP }, 53 { PF_INET, SOCK_STREAM, IPPROTO_TCP }, 54 { PF_INET, SOCK_RAW, 0 }, 55 { PF_INET6, SOCK_DGRAM, IPPROTO_UDP }, 56 { PF_INET6, SOCK_STREAM, IPPROTO_TCP }, 57 { PF_INET6, SOCK_RAW, 0 }, 58 { -1, 0, 0, }, 59 }; 60 61 #define MATCH_FAMILY(a, b) ((a) == matches[(b)].family || (a) == PF_UNSPEC) 62 #define MATCH_PROTO(a, b) ((a) == matches[(b)].protocol || (a) == 0 || matches[(b)].protocol == 0) 63 /* Do not match SOCK_RAW unless explicitly specified */ 64 #define MATCH_SOCKTYPE(a, b) ((a) == matches[(b)].socktype || ((a) == 0 && \ 65 matches[(b)].socktype != SOCK_RAW)) 66 67 enum { 68 DOM_INIT, 69 DOM_DOMAIN, 70 DOM_DONE 71 }; 72 73 struct asr_query * 74 getaddrinfo_async(const char *hostname, const char *servname, 75 const struct addrinfo *hints, void *asr) 76 { 77 struct asr_ctx *ac; 78 struct asr_query *as; 79 80 if (hints == NULL || (hints->ai_flags & AI_NUMERICHOST) == 0) 81 ac = _asr_use_resolver(asr); 82 else 83 ac = _asr_no_resolver(); 84 if ((as = _asr_async_new(ac, ASR_GETADDRINFO)) == NULL) 85 goto abort; /* errno set */ 86 as->as_run = getaddrinfo_async_run; 87 88 if (hostname) { 89 if ((as->as.ai.hostname = strdup(hostname)) == NULL) 90 goto abort; /* errno set */ 91 } 92 if (servname && (as->as.ai.servname = strdup(servname)) == NULL) 93 goto abort; /* errno set */ 94 if (hints) 95 memmove(&as->as.ai.hints, hints, sizeof *hints); 96 else { 97 memset(&as->as.ai.hints, 0, sizeof as->as.ai.hints); 98 as->as.ai.hints.ai_family = PF_UNSPEC; 99 as->as.ai.hints.ai_flags = AI_ADDRCONFIG; 100 } 101 102 _asr_ctx_unref(ac); 103 return (as); 104 abort: 105 if (as) 106 _asr_async_free(as); 107 _asr_ctx_unref(ac); 108 return (NULL); 109 } 110 DEF_WEAK(getaddrinfo_async); 111 112 static int 113 getaddrinfo_async_run(struct asr_query *as, struct asr_result *ar) 114 { 115 char fqdn[MAXDNAME]; 116 const char *str; 117 struct addrinfo *ai; 118 int i, family, r; 119 FILE *f; 120 union { 121 struct sockaddr sa; 122 struct sockaddr_in sain; 123 struct sockaddr_in6 sain6; 124 } sa; 125 126 next: 127 switch (as->as_state) { 128 129 case ASR_STATE_INIT: 130 131 /* 132 * First, make sure the parameters are valid. 133 */ 134 135 as->as_count = 0; 136 137 if (as->as.ai.hostname == NULL && 138 as->as.ai.servname == NULL) { 139 ar->ar_gai_errno = EAI_NONAME; 140 async_set_state(as, ASR_STATE_HALT); 141 break; 142 } 143 144 if (as->as.ai.hostname && as->as.ai.hostname[0] == '\0') { 145 ar->ar_gai_errno = EAI_NODATA; 146 async_set_state(as, ASR_STATE_HALT); 147 break; 148 } 149 150 ai = &as->as.ai.hints; 151 152 if (ai->ai_addrlen || 153 ai->ai_canonname || 154 ai->ai_addr || 155 ai->ai_next) { 156 ar->ar_gai_errno = EAI_BADHINTS; 157 async_set_state(as, ASR_STATE_HALT); 158 break; 159 } 160 161 if (ai->ai_flags & ~AI_MASK || 162 (ai->ai_flags & AI_CANONNAME && ai->ai_flags & AI_FQDN)) { 163 ar->ar_gai_errno = EAI_BADFLAGS; 164 async_set_state(as, ASR_STATE_HALT); 165 break; 166 } 167 168 if (ai->ai_family != PF_UNSPEC && 169 ai->ai_family != PF_INET && 170 ai->ai_family != PF_INET6) { 171 ar->ar_gai_errno = EAI_FAMILY; 172 async_set_state(as, ASR_STATE_HALT); 173 break; 174 } 175 176 if (ai->ai_socktype && 177 ai->ai_socktype != SOCK_DGRAM && 178 ai->ai_socktype != SOCK_STREAM && 179 ai->ai_socktype != SOCK_RAW) { 180 ar->ar_gai_errno = EAI_SOCKTYPE; 181 async_set_state(as, ASR_STATE_HALT); 182 break; 183 } 184 185 if (ai->ai_socktype == SOCK_RAW && 186 get_port(as->as.ai.servname, NULL, 1) != 0) { 187 ar->ar_gai_errno = EAI_SERVICE; 188 async_set_state(as, ASR_STATE_HALT); 189 break; 190 } 191 192 /* Restrict result set to configured address families */ 193 if (ai->ai_flags & AI_ADDRCONFIG) { 194 if (addrconfig_setup(as) == -1) { 195 ar->ar_errno = errno; 196 ar->ar_gai_errno = EAI_SYSTEM; 197 async_set_state(as, ASR_STATE_HALT); 198 break; 199 } 200 } 201 202 /* Make sure there is at least a valid combination */ 203 for (i = 0; matches[i].family != -1; i++) 204 if (MATCH_FAMILY(ai->ai_family, i) && 205 MATCH_SOCKTYPE(ai->ai_socktype, i) && 206 MATCH_PROTO(ai->ai_protocol, i)) 207 break; 208 if (matches[i].family == -1) { 209 ar->ar_gai_errno = EAI_BADHINTS; 210 async_set_state(as, ASR_STATE_HALT); 211 break; 212 } 213 214 if (ai->ai_protocol == 0 || ai->ai_protocol == IPPROTO_UDP) 215 as->as.ai.port_udp = get_port(as->as.ai.servname, "udp", 216 as->as.ai.hints.ai_flags & AI_NUMERICSERV); 217 if (ai->ai_protocol == 0 || ai->ai_protocol == IPPROTO_TCP) 218 as->as.ai.port_tcp = get_port(as->as.ai.servname, "tcp", 219 as->as.ai.hints.ai_flags & AI_NUMERICSERV); 220 if (as->as.ai.port_tcp == -2 || as->as.ai.port_udp == -2 || 221 (as->as.ai.port_tcp == -1 && as->as.ai.port_udp == -1) || 222 (ai->ai_protocol && (as->as.ai.port_udp == -1 || 223 as->as.ai.port_tcp == -1))) { 224 ar->ar_gai_errno = EAI_SERVICE; 225 async_set_state(as, ASR_STATE_HALT); 226 break; 227 } 228 229 ar->ar_gai_errno = 0; 230 231 /* If hostname is NULL, use local address */ 232 if (as->as.ai.hostname == NULL) { 233 for (family = iter_family(as, 1); 234 family != -1; 235 family = iter_family(as, 0)) { 236 /* 237 * We could use statically built sockaddrs for 238 * those, rather than parsing over and over. 239 */ 240 if (family == PF_INET) 241 str = (ai->ai_flags & AI_PASSIVE) ? \ 242 "0.0.0.0" : "127.0.0.1"; 243 else /* PF_INET6 */ 244 str = (ai->ai_flags & AI_PASSIVE) ? \ 245 "::" : "::1"; 246 /* This can't fail */ 247 _asr_sockaddr_from_str(&sa.sa, family, str); 248 if ((r = addrinfo_add(as, &sa.sa, NULL))) { 249 ar->ar_gai_errno = r; 250 break; 251 } 252 } 253 if (ar->ar_gai_errno == 0 && as->as_count == 0) { 254 ar->ar_gai_errno = EAI_NODATA; 255 } 256 async_set_state(as, ASR_STATE_HALT); 257 break; 258 } 259 260 /* Try numeric addresses first */ 261 for (family = iter_family(as, 1); 262 family != -1; 263 family = iter_family(as, 0)) { 264 265 if (_asr_sockaddr_from_str(&sa.sa, family, 266 as->as.ai.hostname) == -1) 267 continue; 268 269 if ((r = addrinfo_add(as, &sa.sa, NULL))) 270 ar->ar_gai_errno = r; 271 break; 272 } 273 if (ar->ar_gai_errno || as->as_count) { 274 async_set_state(as, ASR_STATE_HALT); 275 break; 276 } 277 278 if (ai->ai_flags & AI_NUMERICHOST) { 279 ar->ar_gai_errno = EAI_NONAME; 280 async_set_state(as, ASR_STATE_HALT); 281 break; 282 } 283 284 /* make sure there are no funny characters in hostname */ 285 if (!hnok_lenient(as->as.ai.hostname)) { 286 ar->ar_gai_errno = EAI_FAIL; 287 async_set_state(as, ASR_STATE_HALT); 288 break; 289 } 290 291 async_set_state(as, ASR_STATE_NEXT_DB); 292 break; 293 294 case ASR_STATE_NEXT_DB: 295 if (_asr_iter_db(as) == -1) { 296 async_set_state(as, ASR_STATE_NOT_FOUND); 297 break; 298 } 299 as->as_family_idx = 0; 300 async_set_state(as, ASR_STATE_SAME_DB); 301 break; 302 303 case ASR_STATE_NEXT_FAMILY: 304 as->as_family_idx += 1; 305 if (as->as.ai.hints.ai_family != AF_UNSPEC || 306 AS_FAMILY(as) == -1) { 307 /* The family was specified, or we have tried all 308 * families with this DB. 309 */ 310 if (as->as_count) { 311 ar->ar_gai_errno = 0; 312 async_set_state(as, ASR_STATE_HALT); 313 } else 314 async_set_state(as, ASR_STATE_NEXT_DOMAIN); 315 break; 316 } 317 async_set_state(as, ASR_STATE_SAME_DB); 318 break; 319 320 case ASR_STATE_NEXT_DOMAIN: 321 /* domain search is only for dns */ 322 if (AS_DB(as) != ASR_DB_DNS) { 323 async_set_state(as, ASR_STATE_NEXT_DB); 324 break; 325 } 326 as->as_family_idx = 0; 327 328 free(as->as.ai.fqdn); 329 as->as.ai.fqdn = NULL; 330 r = _asr_iter_domain(as, as->as.ai.hostname, fqdn, sizeof(fqdn)); 331 if (r == -1) { 332 async_set_state(as, ASR_STATE_NEXT_DB); 333 break; 334 } 335 if (r == 0) { 336 ar->ar_gai_errno = EAI_FAIL; 337 async_set_state(as, ASR_STATE_HALT); 338 break; 339 } 340 as->as.ai.fqdn = strdup(fqdn); 341 if (as->as.ai.fqdn == NULL) { 342 ar->ar_gai_errno = EAI_MEMORY; 343 async_set_state(as, ASR_STATE_HALT); 344 break; 345 } 346 347 async_set_state(as, ASR_STATE_SAME_DB); 348 break; 349 350 case ASR_STATE_SAME_DB: 351 /* query the current DB again */ 352 switch (AS_DB(as)) { 353 case ASR_DB_DNS: 354 if (as->as.ai.fqdn == NULL) { 355 /* First try, initialize domain iteration */ 356 as->as_dom_flags = 0; 357 as->as_dom_step = DOM_INIT; 358 async_set_state(as, ASR_STATE_NEXT_DOMAIN); 359 break; 360 } 361 362 family = (as->as.ai.hints.ai_family == AF_UNSPEC) ? 363 AS_FAMILY(as) : as->as.ai.hints.ai_family; 364 365 if (family == AF_INET && 366 as->as_flags & ASYNC_NO_INET) { 367 async_set_state(as, ASR_STATE_NEXT_FAMILY); 368 break; 369 } else if (family == AF_INET6 && 370 as->as_flags & ASYNC_NO_INET6) { 371 async_set_state(as, ASR_STATE_NEXT_FAMILY); 372 break; 373 } 374 375 as->as_subq = _res_query_async_ctx(as->as.ai.fqdn, 376 C_IN, (family == AF_INET6) ? T_AAAA : T_A, 377 as->as_ctx); 378 379 if (as->as_subq == NULL) { 380 if (errno == ENOMEM) 381 ar->ar_gai_errno = EAI_MEMORY; 382 else 383 ar->ar_gai_errno = EAI_FAIL; 384 async_set_state(as, ASR_STATE_HALT); 385 break; 386 } 387 async_set_state(as, ASR_STATE_SUBQUERY); 388 break; 389 390 case ASR_DB_FILE: 391 f = fopen(_PATH_HOSTS, "re"); 392 if (f == NULL) { 393 async_set_state(as, ASR_STATE_NEXT_DB); 394 break; 395 } 396 family = (as->as.ai.hints.ai_family == AF_UNSPEC) ? 397 AS_FAMILY(as) : as->as.ai.hints.ai_family; 398 399 r = addrinfo_from_file(as, family, f); 400 if (r == -1) { 401 if (errno == ENOMEM) 402 ar->ar_gai_errno = EAI_MEMORY; 403 else 404 ar->ar_gai_errno = EAI_FAIL; 405 async_set_state(as, ASR_STATE_HALT); 406 } else 407 async_set_state(as, ASR_STATE_NEXT_FAMILY); 408 fclose(f); 409 break; 410 411 default: 412 async_set_state(as, ASR_STATE_NEXT_DB); 413 } 414 break; 415 416 case ASR_STATE_SUBQUERY: 417 if ((r = asr_run(as->as_subq, ar)) == ASYNC_COND) 418 return (ASYNC_COND); 419 420 as->as_subq = NULL; 421 422 if (ar->ar_datalen == -1) { 423 async_set_state(as, ASR_STATE_NEXT_FAMILY); 424 break; 425 } 426 427 r = addrinfo_from_pkt(as, ar->ar_data, ar->ar_datalen); 428 if (r == -1) { 429 if (errno == ENOMEM) 430 ar->ar_gai_errno = EAI_MEMORY; 431 else 432 ar->ar_gai_errno = EAI_FAIL; 433 async_set_state(as, ASR_STATE_HALT); 434 } else 435 async_set_state(as, ASR_STATE_NEXT_FAMILY); 436 free(ar->ar_data); 437 break; 438 439 case ASR_STATE_NOT_FOUND: 440 /* No result found. Maybe we can try again. */ 441 if (as->as_flags & ASYNC_AGAIN) 442 ar->ar_gai_errno = EAI_AGAIN; 443 else 444 ar->ar_gai_errno = EAI_NODATA; 445 async_set_state(as, ASR_STATE_HALT); 446 break; 447 448 case ASR_STATE_HALT: 449 if (ar->ar_gai_errno == 0) { 450 ar->ar_count = as->as_count; 451 ar->ar_addrinfo = as->as.ai.aifirst; 452 as->as.ai.aifirst = NULL; 453 } else { 454 ar->ar_count = 0; 455 ar->ar_addrinfo = NULL; 456 } 457 return (ASYNC_DONE); 458 459 default: 460 ar->ar_errno = EOPNOTSUPP; 461 ar->ar_gai_errno = EAI_SYSTEM; 462 async_set_state(as, ASR_STATE_HALT); 463 break; 464 } 465 goto next; 466 } 467 468 /* 469 * Retrieve the port number for the service name "servname" and 470 * the protocol "proto". 471 */ 472 static int 473 get_port(const char *servname, const char *proto, int numonly) 474 { 475 struct servent se; 476 struct servent_data sed; 477 int port; 478 const char *e; 479 480 if (servname == NULL) 481 return (0); 482 483 e = NULL; 484 port = strtonum(servname, 0, USHRT_MAX, &e); 485 if (e == NULL) 486 return (port); 487 if (errno == ERANGE) 488 return (-2); /* invalid */ 489 if (numonly) 490 return (-2); 491 492 port = -1; 493 memset(&sed, 0, sizeof(sed)); 494 if (getservbyname_r(servname, proto, &se, &sed) != -1) 495 port = ntohs(se.s_port); 496 endservent_r(&sed); 497 498 return (port); 499 } 500 501 /* 502 * Iterate over the address families that are to be queried. Use the 503 * list on the async context, unless a specific family was given in hints. 504 */ 505 static int 506 iter_family(struct asr_query *as, int first) 507 { 508 if (first) { 509 as->as_family_idx = 0; 510 if (as->as.ai.hints.ai_family != PF_UNSPEC) 511 return as->as.ai.hints.ai_family; 512 return AS_FAMILY(as); 513 } 514 515 if (as->as.ai.hints.ai_family != PF_UNSPEC) 516 return (-1); 517 518 as->as_family_idx++; 519 520 return AS_FAMILY(as); 521 } 522 523 /* 524 * Use the sockaddr at "sa" to extend the result list on the "as" context, 525 * with the specified canonical name "cname". This function adds one 526 * entry per protocol/socktype match. 527 */ 528 static int 529 addrinfo_add(struct asr_query *as, const struct sockaddr *sa, const char *cname) 530 { 531 struct addrinfo *ai; 532 int i, port, proto; 533 534 for (i = 0; matches[i].family != -1; i++) { 535 if (matches[i].family != sa->sa_family || 536 !MATCH_SOCKTYPE(as->as.ai.hints.ai_socktype, i) || 537 !MATCH_PROTO(as->as.ai.hints.ai_protocol, i)) 538 continue; 539 540 proto = as->as.ai.hints.ai_protocol; 541 if (!proto) 542 proto = matches[i].protocol; 543 544 if (proto == IPPROTO_TCP) 545 port = as->as.ai.port_tcp; 546 else if (proto == IPPROTO_UDP) 547 port = as->as.ai.port_udp; 548 else 549 port = 0; 550 551 /* servname specified, but not defined for this protocol */ 552 if (port == -1) 553 continue; 554 555 ai = calloc(1, sizeof(*ai) + sa->sa_len); 556 if (ai == NULL) 557 return (EAI_MEMORY); 558 ai->ai_family = sa->sa_family; 559 ai->ai_socktype = matches[i].socktype; 560 ai->ai_protocol = proto; 561 ai->ai_flags = as->as.ai.hints.ai_flags; 562 ai->ai_addrlen = sa->sa_len; 563 ai->ai_addr = (void *)(ai + 1); 564 if (cname && 565 as->as.ai.hints.ai_flags & (AI_CANONNAME | AI_FQDN)) { 566 if ((ai->ai_canonname = strdup(cname)) == NULL) { 567 free(ai); 568 return (EAI_MEMORY); 569 } 570 } 571 memmove(ai->ai_addr, sa, sa->sa_len); 572 if (sa->sa_family == PF_INET) 573 ((struct sockaddr_in *)ai->ai_addr)->sin_port = 574 htons(port); 575 else if (sa->sa_family == PF_INET6) 576 ((struct sockaddr_in6 *)ai->ai_addr)->sin6_port = 577 htons(port); 578 579 if (as->as.ai.aifirst == NULL) 580 as->as.ai.aifirst = ai; 581 if (as->as.ai.ailast) 582 as->as.ai.ailast->ai_next = ai; 583 as->as.ai.ailast = ai; 584 as->as_count += 1; 585 } 586 587 return (0); 588 } 589 590 static int 591 addrinfo_from_file(struct asr_query *as, int family, FILE *f) 592 { 593 char *tokens[MAXTOKEN], *c, buf[BUFSIZ + 1]; 594 int n, i; 595 union { 596 struct sockaddr sa; 597 struct sockaddr_in sain; 598 struct sockaddr_in6 sain6; 599 } u; 600 601 for (;;) { 602 n = _asr_parse_namedb_line(f, tokens, MAXTOKEN, buf, sizeof(buf)); 603 if (n == -1) 604 break; /* ignore errors reading the file */ 605 606 for (i = 1; i < n; i++) { 607 if (strcasecmp(as->as.ai.hostname, tokens[i])) 608 continue; 609 if (_asr_sockaddr_from_str(&u.sa, family, tokens[0]) == -1) 610 continue; 611 break; 612 } 613 if (i == n) 614 continue; 615 616 if (as->as.ai.hints.ai_flags & (AI_CANONNAME | AI_FQDN)) 617 c = tokens[1]; 618 else 619 c = NULL; 620 621 if (addrinfo_add(as, &u.sa, c)) 622 return (-1); /* errno set */ 623 } 624 return (0); 625 } 626 627 static int 628 addrinfo_from_pkt(struct asr_query *as, char *pkt, size_t pktlen) 629 { 630 struct asr_unpack p; 631 struct asr_dns_header h; 632 struct asr_dns_query q; 633 struct asr_dns_rr rr; 634 int i; 635 union { 636 struct sockaddr sa; 637 struct sockaddr_in sain; 638 struct sockaddr_in6 sain6; 639 } u; 640 char buf[MAXDNAME], *c; 641 642 _asr_unpack_init(&p, pkt, pktlen); 643 _asr_unpack_header(&p, &h); 644 for (; h.qdcount; h.qdcount--) 645 _asr_unpack_query(&p, &q); 646 647 for (i = 0; i < h.ancount; i++) { 648 _asr_unpack_rr(&p, &rr); 649 if (rr.rr_type != q.q_type || 650 rr.rr_class != q.q_class) 651 continue; 652 653 memset(&u, 0, sizeof u); 654 if (rr.rr_type == T_A) { 655 u.sain.sin_len = sizeof u.sain; 656 u.sain.sin_family = AF_INET; 657 u.sain.sin_addr = rr.rr.in_a.addr; 658 u.sain.sin_port = 0; 659 } else if (rr.rr_type == T_AAAA) { 660 u.sain6.sin6_len = sizeof u.sain6; 661 u.sain6.sin6_family = AF_INET6; 662 u.sain6.sin6_addr = rr.rr.in_aaaa.addr6; 663 u.sain6.sin6_port = 0; 664 } else 665 continue; 666 667 if (as->as.ai.hints.ai_flags & AI_CANONNAME) { 668 _asr_strdname(rr.rr_dname, buf, sizeof buf); 669 buf[strlen(buf) - 1] = '\0'; 670 c = res_hnok(buf) ? buf : NULL; 671 } else if (as->as.ai.hints.ai_flags & AI_FQDN) 672 c = as->as.ai.fqdn; 673 else 674 c = NULL; 675 676 if (addrinfo_add(as, &u.sa, c)) 677 return (-1); /* errno set */ 678 } 679 return (0); 680 } 681 682 static int 683 addrconfig_setup(struct asr_query *as) 684 { 685 struct ifaddrs *ifa, *ifa0; 686 struct if_data *ifa_data; 687 struct sockaddr_in *sinp; 688 struct sockaddr_in6 *sin6p; 689 int rtable, ifa_rtable = -1; 690 691 if (getifaddrs(&ifa0) == -1) 692 return (-1); 693 694 rtable = getrtable(); 695 696 as->as_flags |= ASYNC_NO_INET | ASYNC_NO_INET6; 697 698 for (ifa = ifa0; ifa != NULL; ifa = ifa->ifa_next) { 699 if (ifa->ifa_addr == NULL) 700 continue; 701 702 switch (ifa->ifa_addr->sa_family) { 703 case PF_LINK: 704 /* AF_LINK comes before inet / inet6 on an interface */ 705 ifa_data = (struct if_data *)ifa->ifa_data; 706 ifa_rtable = ifa_data->ifi_rdomain; 707 break; 708 case PF_INET: 709 if (ifa_rtable != rtable) 710 continue; 711 712 sinp = (struct sockaddr_in *)ifa->ifa_addr; 713 714 if (sinp->sin_addr.s_addr == htonl(INADDR_LOOPBACK)) 715 continue; 716 717 as->as_flags &= ~ASYNC_NO_INET; 718 break; 719 case PF_INET6: 720 if (ifa_rtable != rtable) 721 continue; 722 723 sin6p = (struct sockaddr_in6 *)ifa->ifa_addr; 724 725 if (IN6_IS_ADDR_LOOPBACK(&sin6p->sin6_addr)) 726 continue; 727 728 if (IN6_IS_ADDR_LINKLOCAL(&sin6p->sin6_addr)) 729 continue; 730 731 as->as_flags &= ~ASYNC_NO_INET6; 732 break; 733 } 734 } 735 736 freeifaddrs(ifa0); 737 738 return (0); 739 } 740