1 /* $OpenBSD: getaddrinfo_async.c,v 1.61 2023/11/21 15:26:56 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 = 0; 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 (!(ai->ai_flags & AI_NUMERICHOST)) 232 is_localhost = _asr_is_localhost(as->as.ai.hostname); 233 /* 234 * If hostname is NULL, "localhost" or falls within the 235 * ".localhost." domain, use local address. 236 * RFC 6761, 6.3: 237 * 3. Name resolution APIs and libraries SHOULD recognize 238 * localhost names as special and SHOULD always return the IP 239 * loopback address for address queries and negative responses 240 * for all other query types. Name resolution APIs SHOULD NOT 241 * send queries for localhost names to their configured caching 242 * DNS server(s). 243 */ 244 if (as->as.ai.hostname == NULL || is_localhost) { 245 for (family = iter_family(as, 1); 246 family != -1; 247 family = iter_family(as, 0)) { 248 /* 249 * We could use statically built sockaddrs for 250 * those, rather than parsing over and over. 251 */ 252 if (family == PF_INET) 253 str = (ai->ai_flags & AI_PASSIVE && 254 !is_localhost) ? "0.0.0.0" : 255 "127.0.0.1"; 256 else /* PF_INET6 */ 257 str = (ai->ai_flags & AI_PASSIVE && 258 !is_localhost) ? "::" : "::1"; 259 /* This can't fail */ 260 _asr_sockaddr_from_str(&sa.sa, family, str); 261 if ((r = addrinfo_add(as, &sa.sa, NULL))) { 262 ar->ar_gai_errno = r; 263 break; 264 } 265 } 266 if (ar->ar_gai_errno == 0 && as->as_count == 0) { 267 ar->ar_gai_errno = EAI_NODATA; 268 } 269 async_set_state(as, ASR_STATE_HALT); 270 break; 271 } 272 273 /* Try numeric addresses first */ 274 for (family = iter_family(as, 1); 275 family != -1; 276 family = iter_family(as, 0)) { 277 278 if (_asr_sockaddr_from_str(&sa.sa, family, 279 as->as.ai.hostname) == -1) 280 continue; 281 282 if ((r = addrinfo_add(as, &sa.sa, NULL))) 283 ar->ar_gai_errno = r; 284 break; 285 } 286 if (ar->ar_gai_errno || as->as_count) { 287 async_set_state(as, ASR_STATE_HALT); 288 break; 289 } 290 291 if (ai->ai_flags & AI_NUMERICHOST) { 292 ar->ar_gai_errno = EAI_NONAME; 293 async_set_state(as, ASR_STATE_HALT); 294 break; 295 } 296 297 /* make sure there are no funny characters in hostname */ 298 if (!hnok_lenient(as->as.ai.hostname)) { 299 ar->ar_gai_errno = EAI_FAIL; 300 async_set_state(as, ASR_STATE_HALT); 301 break; 302 } 303 304 async_set_state(as, ASR_STATE_NEXT_DB); 305 break; 306 307 case ASR_STATE_NEXT_DB: 308 if (_asr_iter_db(as) == -1) { 309 async_set_state(as, ASR_STATE_NOT_FOUND); 310 break; 311 } 312 as->as_family_idx = 0; 313 async_set_state(as, ASR_STATE_SAME_DB); 314 break; 315 316 case ASR_STATE_NEXT_FAMILY: 317 as->as_family_idx += 1; 318 if (as->as.ai.hints.ai_family != AF_UNSPEC || 319 AS_FAMILY(as) == -1) { 320 /* The family was specified, or we have tried all 321 * families with this DB. 322 */ 323 if (as->as_count) { 324 ar->ar_gai_errno = 0; 325 async_set_state(as, ASR_STATE_HALT); 326 } else 327 async_set_state(as, ASR_STATE_NEXT_DOMAIN); 328 break; 329 } 330 async_set_state(as, ASR_STATE_SAME_DB); 331 break; 332 333 case ASR_STATE_NEXT_DOMAIN: 334 /* domain search is only for dns */ 335 if (AS_DB(as) != ASR_DB_DNS) { 336 async_set_state(as, ASR_STATE_NEXT_DB); 337 break; 338 } 339 as->as_family_idx = 0; 340 341 free(as->as.ai.fqdn); 342 as->as.ai.fqdn = NULL; 343 r = _asr_iter_domain(as, as->as.ai.hostname, fqdn, sizeof(fqdn)); 344 if (r == -1) { 345 async_set_state(as, ASR_STATE_NEXT_DB); 346 break; 347 } 348 if (r == 0) { 349 ar->ar_gai_errno = EAI_FAIL; 350 async_set_state(as, ASR_STATE_HALT); 351 break; 352 } 353 as->as.ai.fqdn = strdup(fqdn); 354 if (as->as.ai.fqdn == NULL) { 355 ar->ar_gai_errno = EAI_MEMORY; 356 async_set_state(as, ASR_STATE_HALT); 357 break; 358 } 359 360 async_set_state(as, ASR_STATE_SAME_DB); 361 break; 362 363 case ASR_STATE_SAME_DB: 364 /* query the current DB again */ 365 switch (AS_DB(as)) { 366 case ASR_DB_DNS: 367 if (as->as.ai.fqdn == NULL) { 368 /* First try, initialize domain iteration */ 369 as->as_dom_flags = 0; 370 as->as_dom_step = DOM_INIT; 371 async_set_state(as, ASR_STATE_NEXT_DOMAIN); 372 break; 373 } 374 375 family = (as->as.ai.hints.ai_family == AF_UNSPEC) ? 376 AS_FAMILY(as) : as->as.ai.hints.ai_family; 377 378 if (family == AF_INET && 379 as->as_flags & ASYNC_NO_INET) { 380 async_set_state(as, ASR_STATE_NEXT_FAMILY); 381 break; 382 } else if (family == AF_INET6 && 383 as->as_flags & ASYNC_NO_INET6) { 384 async_set_state(as, ASR_STATE_NEXT_FAMILY); 385 break; 386 } 387 388 as->as_subq = _res_query_async_ctx(as->as.ai.fqdn, 389 C_IN, (family == AF_INET6) ? T_AAAA : T_A, 390 as->as_ctx); 391 392 if (as->as_subq == NULL) { 393 if (errno == ENOMEM) 394 ar->ar_gai_errno = EAI_MEMORY; 395 else 396 ar->ar_gai_errno = EAI_FAIL; 397 async_set_state(as, ASR_STATE_HALT); 398 break; 399 } 400 async_set_state(as, ASR_STATE_SUBQUERY); 401 break; 402 403 case ASR_DB_FILE: 404 f = fopen(_PATH_HOSTS, "re"); 405 if (f == NULL) { 406 async_set_state(as, ASR_STATE_NEXT_DB); 407 break; 408 } 409 family = (as->as.ai.hints.ai_family == AF_UNSPEC) ? 410 AS_FAMILY(as) : as->as.ai.hints.ai_family; 411 412 r = addrinfo_from_file(as, family, f); 413 if (r == -1) { 414 if (errno == ENOMEM) 415 ar->ar_gai_errno = EAI_MEMORY; 416 else 417 ar->ar_gai_errno = EAI_FAIL; 418 async_set_state(as, ASR_STATE_HALT); 419 } else 420 async_set_state(as, ASR_STATE_NEXT_FAMILY); 421 fclose(f); 422 break; 423 424 default: 425 async_set_state(as, ASR_STATE_NEXT_DB); 426 } 427 break; 428 429 case ASR_STATE_SUBQUERY: 430 if ((r = asr_run(as->as_subq, ar)) == ASYNC_COND) 431 return (ASYNC_COND); 432 433 as->as_subq = NULL; 434 435 if (ar->ar_datalen == -1) { 436 async_set_state(as, ASR_STATE_NEXT_FAMILY); 437 break; 438 } 439 440 r = addrinfo_from_pkt(as, ar->ar_data, ar->ar_datalen); 441 if (r == -1) { 442 if (errno == ENOMEM) 443 ar->ar_gai_errno = EAI_MEMORY; 444 else 445 ar->ar_gai_errno = EAI_FAIL; 446 async_set_state(as, ASR_STATE_HALT); 447 } else 448 async_set_state(as, ASR_STATE_NEXT_FAMILY); 449 free(ar->ar_data); 450 break; 451 452 case ASR_STATE_NOT_FOUND: 453 /* No result found. Maybe we can try again. */ 454 if (as->as_flags & ASYNC_AGAIN) 455 ar->ar_gai_errno = EAI_AGAIN; 456 else 457 ar->ar_gai_errno = EAI_NODATA; 458 async_set_state(as, ASR_STATE_HALT); 459 break; 460 461 case ASR_STATE_HALT: 462 if (ar->ar_gai_errno == 0) { 463 ar->ar_count = as->as_count; 464 ar->ar_addrinfo = as->as.ai.aifirst; 465 as->as.ai.aifirst = NULL; 466 } else { 467 ar->ar_count = 0; 468 ar->ar_addrinfo = NULL; 469 } 470 return (ASYNC_DONE); 471 472 default: 473 ar->ar_errno = EOPNOTSUPP; 474 ar->ar_gai_errno = EAI_SYSTEM; 475 async_set_state(as, ASR_STATE_HALT); 476 break; 477 } 478 goto next; 479 } 480 481 /* 482 * Retrieve the port number for the service name "servname" and 483 * the protocol "proto". 484 */ 485 static int 486 get_port(const char *servname, const char *proto, int numonly) 487 { 488 struct servent se; 489 struct servent_data sed; 490 int port; 491 const char *e; 492 493 if (servname == NULL) 494 return (0); 495 496 e = NULL; 497 port = strtonum(servname, 0, USHRT_MAX, &e); 498 if (e == NULL) 499 return (port); 500 if (errno == ERANGE) 501 return (-2); /* invalid */ 502 if (numonly) 503 return (-2); 504 505 port = -1; 506 memset(&sed, 0, sizeof(sed)); 507 if (getservbyname_r(servname, proto, &se, &sed) != -1) 508 port = ntohs(se.s_port); 509 endservent_r(&sed); 510 511 return (port); 512 } 513 514 /* 515 * Iterate over the address families that are to be queried. Use the 516 * list on the async context, unless a specific family was given in hints. 517 */ 518 static int 519 iter_family(struct asr_query *as, int first) 520 { 521 if (first) { 522 as->as_family_idx = 0; 523 if (as->as.ai.hints.ai_family != PF_UNSPEC) 524 return as->as.ai.hints.ai_family; 525 return AS_FAMILY(as); 526 } 527 528 if (as->as.ai.hints.ai_family != PF_UNSPEC) 529 return (-1); 530 531 as->as_family_idx++; 532 533 return AS_FAMILY(as); 534 } 535 536 /* 537 * Use the sockaddr at "sa" to extend the result list on the "as" context, 538 * with the specified canonical name "cname". This function adds one 539 * entry per protocol/socktype match. 540 */ 541 static int 542 addrinfo_add(struct asr_query *as, const struct sockaddr *sa, const char *cname) 543 { 544 struct addrinfo *ai; 545 int i, port, proto; 546 547 for (i = 0; matches[i].family != -1; i++) { 548 if (matches[i].family != sa->sa_family || 549 !MATCH_SOCKTYPE(as->as.ai.hints.ai_socktype, i) || 550 !MATCH_PROTO(as->as.ai.hints.ai_protocol, i)) 551 continue; 552 553 proto = as->as.ai.hints.ai_protocol; 554 if (!proto) 555 proto = matches[i].protocol; 556 557 if (proto == IPPROTO_TCP) 558 port = as->as.ai.port_tcp; 559 else if (proto == IPPROTO_UDP) 560 port = as->as.ai.port_udp; 561 else 562 port = 0; 563 564 /* servname specified, but not defined for this protocol */ 565 if (port == -1) 566 continue; 567 568 ai = calloc(1, sizeof(*ai) + sa->sa_len); 569 if (ai == NULL) 570 return (EAI_MEMORY); 571 ai->ai_family = sa->sa_family; 572 ai->ai_socktype = matches[i].socktype; 573 ai->ai_protocol = proto; 574 ai->ai_flags = as->as.ai.hints.ai_flags; 575 ai->ai_addrlen = sa->sa_len; 576 ai->ai_addr = (void *)(ai + 1); 577 if (cname && 578 as->as.ai.hints.ai_flags & (AI_CANONNAME | AI_FQDN)) { 579 if ((ai->ai_canonname = strdup(cname)) == NULL) { 580 free(ai); 581 return (EAI_MEMORY); 582 } 583 } 584 memmove(ai->ai_addr, sa, sa->sa_len); 585 if (sa->sa_family == PF_INET) 586 ((struct sockaddr_in *)ai->ai_addr)->sin_port = 587 htons(port); 588 else if (sa->sa_family == PF_INET6) 589 ((struct sockaddr_in6 *)ai->ai_addr)->sin6_port = 590 htons(port); 591 592 if (as->as.ai.aifirst == NULL) 593 as->as.ai.aifirst = ai; 594 if (as->as.ai.ailast) 595 as->as.ai.ailast->ai_next = ai; 596 as->as.ai.ailast = ai; 597 as->as_count += 1; 598 } 599 600 return (0); 601 } 602 603 static int 604 addrinfo_from_file(struct asr_query *as, int family, FILE *f) 605 { 606 char *tokens[MAXTOKEN], *c, buf[BUFSIZ + 1]; 607 int n, i; 608 union { 609 struct sockaddr sa; 610 struct sockaddr_in sain; 611 struct sockaddr_in6 sain6; 612 } u; 613 614 for (;;) { 615 n = _asr_parse_namedb_line(f, tokens, MAXTOKEN, buf, sizeof(buf)); 616 if (n == -1) 617 break; /* ignore errors reading the file */ 618 619 for (i = 1; i < n; i++) { 620 if (strcasecmp(as->as.ai.hostname, tokens[i])) 621 continue; 622 if (_asr_sockaddr_from_str(&u.sa, family, tokens[0]) == -1) 623 continue; 624 break; 625 } 626 if (i == n) 627 continue; 628 629 if (as->as.ai.hints.ai_flags & (AI_CANONNAME | AI_FQDN)) 630 c = tokens[1]; 631 else 632 c = NULL; 633 634 if (addrinfo_add(as, &u.sa, c)) 635 return (-1); /* errno set */ 636 } 637 return (0); 638 } 639 640 static int 641 addrinfo_from_pkt(struct asr_query *as, char *pkt, size_t pktlen) 642 { 643 struct asr_unpack p; 644 struct asr_dns_header h; 645 struct asr_dns_query q; 646 struct asr_dns_rr rr; 647 int i; 648 union { 649 struct sockaddr sa; 650 struct sockaddr_in sain; 651 struct sockaddr_in6 sain6; 652 } u; 653 char buf[MAXDNAME], *c; 654 655 _asr_unpack_init(&p, pkt, pktlen); 656 _asr_unpack_header(&p, &h); 657 for (; h.qdcount; h.qdcount--) 658 _asr_unpack_query(&p, &q); 659 660 for (i = 0; i < h.ancount; i++) { 661 _asr_unpack_rr(&p, &rr); 662 if (rr.rr_type != q.q_type || 663 rr.rr_class != q.q_class) 664 continue; 665 666 memset(&u, 0, sizeof u); 667 if (rr.rr_type == T_A) { 668 u.sain.sin_len = sizeof u.sain; 669 u.sain.sin_family = AF_INET; 670 u.sain.sin_addr = rr.rr.in_a.addr; 671 u.sain.sin_port = 0; 672 } else if (rr.rr_type == T_AAAA) { 673 u.sain6.sin6_len = sizeof u.sain6; 674 u.sain6.sin6_family = AF_INET6; 675 u.sain6.sin6_addr = rr.rr.in_aaaa.addr6; 676 u.sain6.sin6_port = 0; 677 } else 678 continue; 679 680 if (as->as.ai.hints.ai_flags & AI_CANONNAME) { 681 _asr_strdname(rr.rr_dname, buf, sizeof buf); 682 buf[strlen(buf) - 1] = '\0'; 683 c = res_hnok(buf) ? buf : NULL; 684 } else if (as->as.ai.hints.ai_flags & AI_FQDN) 685 c = as->as.ai.fqdn; 686 else 687 c = NULL; 688 689 if (addrinfo_add(as, &u.sa, c)) 690 return (-1); /* errno set */ 691 } 692 return (0); 693 } 694 695 static int 696 addrconfig_setup(struct asr_query *as) 697 { 698 struct ifaddrs *ifa, *ifa0; 699 struct if_data *ifa_data; 700 struct sockaddr_in *sinp; 701 struct sockaddr_in6 *sin6p; 702 int rtable, ifa_rtable = -1; 703 704 if (getifaddrs(&ifa0) == -1) 705 return (-1); 706 707 rtable = getrtable(); 708 709 as->as_flags |= ASYNC_NO_INET | ASYNC_NO_INET6; 710 711 for (ifa = ifa0; ifa != NULL; ifa = ifa->ifa_next) { 712 if (ifa->ifa_addr == NULL) 713 continue; 714 715 switch (ifa->ifa_addr->sa_family) { 716 case PF_LINK: 717 /* AF_LINK comes before inet / inet6 on an interface */ 718 ifa_data = (struct if_data *)ifa->ifa_data; 719 ifa_rtable = ifa_data->ifi_rdomain; 720 break; 721 case PF_INET: 722 if (ifa_rtable != rtable) 723 continue; 724 725 sinp = (struct sockaddr_in *)ifa->ifa_addr; 726 727 if (sinp->sin_addr.s_addr == htonl(INADDR_LOOPBACK)) 728 continue; 729 730 as->as_flags &= ~ASYNC_NO_INET; 731 break; 732 case PF_INET6: 733 if (ifa_rtable != rtable) 734 continue; 735 736 sin6p = (struct sockaddr_in6 *)ifa->ifa_addr; 737 738 if (IN6_IS_ADDR_LOOPBACK(&sin6p->sin6_addr)) 739 continue; 740 741 if (IN6_IS_ADDR_LINKLOCAL(&sin6p->sin6_addr)) 742 continue; 743 744 as->as_flags &= ~ASYNC_NO_INET6; 745 break; 746 } 747 } 748 749 freeifaddrs(ifa0); 750 751 return (0); 752 } 753