1 /* $OpenBSD: getaddrinfo_async.c,v 1.60 2023/11/20 12:15:16 florian 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, is_localhost; 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 is_localhost = _asr_is_localhost(as->as.ai.hostname); 232 /* 233 * If hostname is NULL, "localhost" or falls within the 234 * ".localhost." domain, use local address. 235 * RFC 6761, 6.3: 236 * 3. Name resolution APIs and libraries SHOULD recognize 237 * localhost names as special and SHOULD always return the IP 238 * loopback address for address queries and negative responses 239 * for all other query types. Name resolution APIs SHOULD NOT 240 * send queries for localhost names to their configured caching 241 * DNS server(s). 242 */ 243 if (as->as.ai.hostname == NULL || is_localhost) { 244 for (family = iter_family(as, 1); 245 family != -1; 246 family = iter_family(as, 0)) { 247 /* 248 * We could use statically built sockaddrs for 249 * those, rather than parsing over and over. 250 */ 251 if (family == PF_INET) 252 str = (ai->ai_flags & AI_PASSIVE && 253 !is_localhost) ? "0.0.0.0" : 254 "127.0.0.1"; 255 else /* PF_INET6 */ 256 str = (ai->ai_flags & AI_PASSIVE && 257 !is_localhost) ? "::" : "::1"; 258 /* This can't fail */ 259 _asr_sockaddr_from_str(&sa.sa, family, str); 260 if ((r = addrinfo_add(as, &sa.sa, NULL))) { 261 ar->ar_gai_errno = r; 262 break; 263 } 264 } 265 if (ar->ar_gai_errno == 0 && as->as_count == 0) { 266 ar->ar_gai_errno = EAI_NODATA; 267 } 268 async_set_state(as, ASR_STATE_HALT); 269 break; 270 } 271 272 /* Try numeric addresses first */ 273 for (family = iter_family(as, 1); 274 family != -1; 275 family = iter_family(as, 0)) { 276 277 if (_asr_sockaddr_from_str(&sa.sa, family, 278 as->as.ai.hostname) == -1) 279 continue; 280 281 if ((r = addrinfo_add(as, &sa.sa, NULL))) 282 ar->ar_gai_errno = r; 283 break; 284 } 285 if (ar->ar_gai_errno || as->as_count) { 286 async_set_state(as, ASR_STATE_HALT); 287 break; 288 } 289 290 if (ai->ai_flags & AI_NUMERICHOST) { 291 ar->ar_gai_errno = EAI_NONAME; 292 async_set_state(as, ASR_STATE_HALT); 293 break; 294 } 295 296 /* make sure there are no funny characters in hostname */ 297 if (!hnok_lenient(as->as.ai.hostname)) { 298 ar->ar_gai_errno = EAI_FAIL; 299 async_set_state(as, ASR_STATE_HALT); 300 break; 301 } 302 303 async_set_state(as, ASR_STATE_NEXT_DB); 304 break; 305 306 case ASR_STATE_NEXT_DB: 307 if (_asr_iter_db(as) == -1) { 308 async_set_state(as, ASR_STATE_NOT_FOUND); 309 break; 310 } 311 as->as_family_idx = 0; 312 async_set_state(as, ASR_STATE_SAME_DB); 313 break; 314 315 case ASR_STATE_NEXT_FAMILY: 316 as->as_family_idx += 1; 317 if (as->as.ai.hints.ai_family != AF_UNSPEC || 318 AS_FAMILY(as) == -1) { 319 /* The family was specified, or we have tried all 320 * families with this DB. 321 */ 322 if (as->as_count) { 323 ar->ar_gai_errno = 0; 324 async_set_state(as, ASR_STATE_HALT); 325 } else 326 async_set_state(as, ASR_STATE_NEXT_DOMAIN); 327 break; 328 } 329 async_set_state(as, ASR_STATE_SAME_DB); 330 break; 331 332 case ASR_STATE_NEXT_DOMAIN: 333 /* domain search is only for dns */ 334 if (AS_DB(as) != ASR_DB_DNS) { 335 async_set_state(as, ASR_STATE_NEXT_DB); 336 break; 337 } 338 as->as_family_idx = 0; 339 340 free(as->as.ai.fqdn); 341 as->as.ai.fqdn = NULL; 342 r = _asr_iter_domain(as, as->as.ai.hostname, fqdn, sizeof(fqdn)); 343 if (r == -1) { 344 async_set_state(as, ASR_STATE_NEXT_DB); 345 break; 346 } 347 if (r == 0) { 348 ar->ar_gai_errno = EAI_FAIL; 349 async_set_state(as, ASR_STATE_HALT); 350 break; 351 } 352 as->as.ai.fqdn = strdup(fqdn); 353 if (as->as.ai.fqdn == NULL) { 354 ar->ar_gai_errno = EAI_MEMORY; 355 async_set_state(as, ASR_STATE_HALT); 356 break; 357 } 358 359 async_set_state(as, ASR_STATE_SAME_DB); 360 break; 361 362 case ASR_STATE_SAME_DB: 363 /* query the current DB again */ 364 switch (AS_DB(as)) { 365 case ASR_DB_DNS: 366 if (as->as.ai.fqdn == NULL) { 367 /* First try, initialize domain iteration */ 368 as->as_dom_flags = 0; 369 as->as_dom_step = DOM_INIT; 370 async_set_state(as, ASR_STATE_NEXT_DOMAIN); 371 break; 372 } 373 374 family = (as->as.ai.hints.ai_family == AF_UNSPEC) ? 375 AS_FAMILY(as) : as->as.ai.hints.ai_family; 376 377 if (family == AF_INET && 378 as->as_flags & ASYNC_NO_INET) { 379 async_set_state(as, ASR_STATE_NEXT_FAMILY); 380 break; 381 } else if (family == AF_INET6 && 382 as->as_flags & ASYNC_NO_INET6) { 383 async_set_state(as, ASR_STATE_NEXT_FAMILY); 384 break; 385 } 386 387 as->as_subq = _res_query_async_ctx(as->as.ai.fqdn, 388 C_IN, (family == AF_INET6) ? T_AAAA : T_A, 389 as->as_ctx); 390 391 if (as->as_subq == NULL) { 392 if (errno == ENOMEM) 393 ar->ar_gai_errno = EAI_MEMORY; 394 else 395 ar->ar_gai_errno = EAI_FAIL; 396 async_set_state(as, ASR_STATE_HALT); 397 break; 398 } 399 async_set_state(as, ASR_STATE_SUBQUERY); 400 break; 401 402 case ASR_DB_FILE: 403 f = fopen(_PATH_HOSTS, "re"); 404 if (f == NULL) { 405 async_set_state(as, ASR_STATE_NEXT_DB); 406 break; 407 } 408 family = (as->as.ai.hints.ai_family == AF_UNSPEC) ? 409 AS_FAMILY(as) : as->as.ai.hints.ai_family; 410 411 r = addrinfo_from_file(as, family, f); 412 if (r == -1) { 413 if (errno == ENOMEM) 414 ar->ar_gai_errno = EAI_MEMORY; 415 else 416 ar->ar_gai_errno = EAI_FAIL; 417 async_set_state(as, ASR_STATE_HALT); 418 } else 419 async_set_state(as, ASR_STATE_NEXT_FAMILY); 420 fclose(f); 421 break; 422 423 default: 424 async_set_state(as, ASR_STATE_NEXT_DB); 425 } 426 break; 427 428 case ASR_STATE_SUBQUERY: 429 if ((r = asr_run(as->as_subq, ar)) == ASYNC_COND) 430 return (ASYNC_COND); 431 432 as->as_subq = NULL; 433 434 if (ar->ar_datalen == -1) { 435 async_set_state(as, ASR_STATE_NEXT_FAMILY); 436 break; 437 } 438 439 r = addrinfo_from_pkt(as, ar->ar_data, ar->ar_datalen); 440 if (r == -1) { 441 if (errno == ENOMEM) 442 ar->ar_gai_errno = EAI_MEMORY; 443 else 444 ar->ar_gai_errno = EAI_FAIL; 445 async_set_state(as, ASR_STATE_HALT); 446 } else 447 async_set_state(as, ASR_STATE_NEXT_FAMILY); 448 free(ar->ar_data); 449 break; 450 451 case ASR_STATE_NOT_FOUND: 452 /* No result found. Maybe we can try again. */ 453 if (as->as_flags & ASYNC_AGAIN) 454 ar->ar_gai_errno = EAI_AGAIN; 455 else 456 ar->ar_gai_errno = EAI_NODATA; 457 async_set_state(as, ASR_STATE_HALT); 458 break; 459 460 case ASR_STATE_HALT: 461 if (ar->ar_gai_errno == 0) { 462 ar->ar_count = as->as_count; 463 ar->ar_addrinfo = as->as.ai.aifirst; 464 as->as.ai.aifirst = NULL; 465 } else { 466 ar->ar_count = 0; 467 ar->ar_addrinfo = NULL; 468 } 469 return (ASYNC_DONE); 470 471 default: 472 ar->ar_errno = EOPNOTSUPP; 473 ar->ar_gai_errno = EAI_SYSTEM; 474 async_set_state(as, ASR_STATE_HALT); 475 break; 476 } 477 goto next; 478 } 479 480 /* 481 * Retrieve the port number for the service name "servname" and 482 * the protocol "proto". 483 */ 484 static int 485 get_port(const char *servname, const char *proto, int numonly) 486 { 487 struct servent se; 488 struct servent_data sed; 489 int port; 490 const char *e; 491 492 if (servname == NULL) 493 return (0); 494 495 e = NULL; 496 port = strtonum(servname, 0, USHRT_MAX, &e); 497 if (e == NULL) 498 return (port); 499 if (errno == ERANGE) 500 return (-2); /* invalid */ 501 if (numonly) 502 return (-2); 503 504 port = -1; 505 memset(&sed, 0, sizeof(sed)); 506 if (getservbyname_r(servname, proto, &se, &sed) != -1) 507 port = ntohs(se.s_port); 508 endservent_r(&sed); 509 510 return (port); 511 } 512 513 /* 514 * Iterate over the address families that are to be queried. Use the 515 * list on the async context, unless a specific family was given in hints. 516 */ 517 static int 518 iter_family(struct asr_query *as, int first) 519 { 520 if (first) { 521 as->as_family_idx = 0; 522 if (as->as.ai.hints.ai_family != PF_UNSPEC) 523 return as->as.ai.hints.ai_family; 524 return AS_FAMILY(as); 525 } 526 527 if (as->as.ai.hints.ai_family != PF_UNSPEC) 528 return (-1); 529 530 as->as_family_idx++; 531 532 return AS_FAMILY(as); 533 } 534 535 /* 536 * Use the sockaddr at "sa" to extend the result list on the "as" context, 537 * with the specified canonical name "cname". This function adds one 538 * entry per protocol/socktype match. 539 */ 540 static int 541 addrinfo_add(struct asr_query *as, const struct sockaddr *sa, const char *cname) 542 { 543 struct addrinfo *ai; 544 int i, port, proto; 545 546 for (i = 0; matches[i].family != -1; i++) { 547 if (matches[i].family != sa->sa_family || 548 !MATCH_SOCKTYPE(as->as.ai.hints.ai_socktype, i) || 549 !MATCH_PROTO(as->as.ai.hints.ai_protocol, i)) 550 continue; 551 552 proto = as->as.ai.hints.ai_protocol; 553 if (!proto) 554 proto = matches[i].protocol; 555 556 if (proto == IPPROTO_TCP) 557 port = as->as.ai.port_tcp; 558 else if (proto == IPPROTO_UDP) 559 port = as->as.ai.port_udp; 560 else 561 port = 0; 562 563 /* servname specified, but not defined for this protocol */ 564 if (port == -1) 565 continue; 566 567 ai = calloc(1, sizeof(*ai) + sa->sa_len); 568 if (ai == NULL) 569 return (EAI_MEMORY); 570 ai->ai_family = sa->sa_family; 571 ai->ai_socktype = matches[i].socktype; 572 ai->ai_protocol = proto; 573 ai->ai_flags = as->as.ai.hints.ai_flags; 574 ai->ai_addrlen = sa->sa_len; 575 ai->ai_addr = (void *)(ai + 1); 576 if (cname && 577 as->as.ai.hints.ai_flags & (AI_CANONNAME | AI_FQDN)) { 578 if ((ai->ai_canonname = strdup(cname)) == NULL) { 579 free(ai); 580 return (EAI_MEMORY); 581 } 582 } 583 memmove(ai->ai_addr, sa, sa->sa_len); 584 if (sa->sa_family == PF_INET) 585 ((struct sockaddr_in *)ai->ai_addr)->sin_port = 586 htons(port); 587 else if (sa->sa_family == PF_INET6) 588 ((struct sockaddr_in6 *)ai->ai_addr)->sin6_port = 589 htons(port); 590 591 if (as->as.ai.aifirst == NULL) 592 as->as.ai.aifirst = ai; 593 if (as->as.ai.ailast) 594 as->as.ai.ailast->ai_next = ai; 595 as->as.ai.ailast = ai; 596 as->as_count += 1; 597 } 598 599 return (0); 600 } 601 602 static int 603 addrinfo_from_file(struct asr_query *as, int family, FILE *f) 604 { 605 char *tokens[MAXTOKEN], *c, buf[BUFSIZ + 1]; 606 int n, i; 607 union { 608 struct sockaddr sa; 609 struct sockaddr_in sain; 610 struct sockaddr_in6 sain6; 611 } u; 612 613 for (;;) { 614 n = _asr_parse_namedb_line(f, tokens, MAXTOKEN, buf, sizeof(buf)); 615 if (n == -1) 616 break; /* ignore errors reading the file */ 617 618 for (i = 1; i < n; i++) { 619 if (strcasecmp(as->as.ai.hostname, tokens[i])) 620 continue; 621 if (_asr_sockaddr_from_str(&u.sa, family, tokens[0]) == -1) 622 continue; 623 break; 624 } 625 if (i == n) 626 continue; 627 628 if (as->as.ai.hints.ai_flags & (AI_CANONNAME | AI_FQDN)) 629 c = tokens[1]; 630 else 631 c = NULL; 632 633 if (addrinfo_add(as, &u.sa, c)) 634 return (-1); /* errno set */ 635 } 636 return (0); 637 } 638 639 static int 640 addrinfo_from_pkt(struct asr_query *as, char *pkt, size_t pktlen) 641 { 642 struct asr_unpack p; 643 struct asr_dns_header h; 644 struct asr_dns_query q; 645 struct asr_dns_rr rr; 646 int i; 647 union { 648 struct sockaddr sa; 649 struct sockaddr_in sain; 650 struct sockaddr_in6 sain6; 651 } u; 652 char buf[MAXDNAME], *c; 653 654 _asr_unpack_init(&p, pkt, pktlen); 655 _asr_unpack_header(&p, &h); 656 for (; h.qdcount; h.qdcount--) 657 _asr_unpack_query(&p, &q); 658 659 for (i = 0; i < h.ancount; i++) { 660 _asr_unpack_rr(&p, &rr); 661 if (rr.rr_type != q.q_type || 662 rr.rr_class != q.q_class) 663 continue; 664 665 memset(&u, 0, sizeof u); 666 if (rr.rr_type == T_A) { 667 u.sain.sin_len = sizeof u.sain; 668 u.sain.sin_family = AF_INET; 669 u.sain.sin_addr = rr.rr.in_a.addr; 670 u.sain.sin_port = 0; 671 } else if (rr.rr_type == T_AAAA) { 672 u.sain6.sin6_len = sizeof u.sain6; 673 u.sain6.sin6_family = AF_INET6; 674 u.sain6.sin6_addr = rr.rr.in_aaaa.addr6; 675 u.sain6.sin6_port = 0; 676 } else 677 continue; 678 679 if (as->as.ai.hints.ai_flags & AI_CANONNAME) { 680 _asr_strdname(rr.rr_dname, buf, sizeof buf); 681 buf[strlen(buf) - 1] = '\0'; 682 c = res_hnok(buf) ? buf : NULL; 683 } else if (as->as.ai.hints.ai_flags & AI_FQDN) 684 c = as->as.ai.fqdn; 685 else 686 c = NULL; 687 688 if (addrinfo_add(as, &u.sa, c)) 689 return (-1); /* errno set */ 690 } 691 return (0); 692 } 693 694 static int 695 addrconfig_setup(struct asr_query *as) 696 { 697 struct ifaddrs *ifa, *ifa0; 698 struct if_data *ifa_data; 699 struct sockaddr_in *sinp; 700 struct sockaddr_in6 *sin6p; 701 int rtable, ifa_rtable = -1; 702 703 if (getifaddrs(&ifa0) == -1) 704 return (-1); 705 706 rtable = getrtable(); 707 708 as->as_flags |= ASYNC_NO_INET | ASYNC_NO_INET6; 709 710 for (ifa = ifa0; ifa != NULL; ifa = ifa->ifa_next) { 711 if (ifa->ifa_addr == NULL) 712 continue; 713 714 switch (ifa->ifa_addr->sa_family) { 715 case PF_LINK: 716 /* AF_LINK comes before inet / inet6 on an interface */ 717 ifa_data = (struct if_data *)ifa->ifa_data; 718 ifa_rtable = ifa_data->ifi_rdomain; 719 break; 720 case PF_INET: 721 if (ifa_rtable != rtable) 722 continue; 723 724 sinp = (struct sockaddr_in *)ifa->ifa_addr; 725 726 if (sinp->sin_addr.s_addr == htonl(INADDR_LOOPBACK)) 727 continue; 728 729 as->as_flags &= ~ASYNC_NO_INET; 730 break; 731 case PF_INET6: 732 if (ifa_rtable != rtable) 733 continue; 734 735 sin6p = (struct sockaddr_in6 *)ifa->ifa_addr; 736 737 if (IN6_IS_ADDR_LOOPBACK(&sin6p->sin6_addr)) 738 continue; 739 740 if (IN6_IS_ADDR_LINKLOCAL(&sin6p->sin6_addr)) 741 continue; 742 743 as->as_flags &= ~ASYNC_NO_INET6; 744 break; 745 } 746 } 747 748 freeifaddrs(ifa0); 749 750 return (0); 751 } 752