gethnamaddr.c revision 1.59
1 /* $NetBSD: gethnamaddr.c,v 1.59 2004/05/21 02:30:03 christos Exp $ */ 2 3 /* 4 * ++Copyright++ 1985, 1988, 1993 5 * - 6 * Copyright (c) 1985, 1988, 1993 7 * The Regents of the University of California. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * - 33 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 34 * 35 * Permission to use, copy, modify, and distribute this software for any 36 * purpose with or without fee is hereby granted, provided that the above 37 * copyright notice and this permission notice appear in all copies, and that 38 * the name of Digital Equipment Corporation not be used in advertising or 39 * publicity pertaining to distribution of the document or software without 40 * specific, written prior permission. 41 * 42 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 43 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 44 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 45 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 46 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 47 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 48 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 49 * SOFTWARE. 50 * - 51 * --Copyright-- 52 */ 53 54 #include <sys/cdefs.h> 55 #if defined(LIBC_SCCS) && !defined(lint) 56 #if 0 57 static char sccsid[] = "@(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93"; 58 static char rcsid[] = "Id: gethnamaddr.c,v 8.21 1997/06/01 20:34:37 vixie Exp "; 59 #else 60 __RCSID("$NetBSD: gethnamaddr.c,v 1.59 2004/05/21 02:30:03 christos Exp $"); 61 #endif 62 #endif /* LIBC_SCCS and not lint */ 63 64 #if defined(_LIBC) 65 #include "namespace.h" 66 #endif 67 #include <sys/param.h> 68 #include <sys/socket.h> 69 #include <netinet/in.h> 70 #include <arpa/inet.h> 71 #include <arpa/nameser.h> 72 73 #include <assert.h> 74 #include <ctype.h> 75 #include <errno.h> 76 #include <netdb.h> 77 #include <resolv.h> 78 #include <stdarg.h> 79 #include <stdio.h> 80 #include <syslog.h> 81 82 #ifndef LOG_AUTH 83 # define LOG_AUTH 0 84 #endif 85 86 #define MULTI_PTRS_ARE_ALIASES 1 /* XXX - experimental */ 87 88 #include <nsswitch.h> 89 #include <stdlib.h> 90 #include <string.h> 91 92 #ifdef YP 93 #include <rpc/rpc.h> 94 #include <rpcsvc/yp_prot.h> 95 #include <rpcsvc/ypclnt.h> 96 #endif 97 98 #if defined(_LIBC) && defined(__weak_alias) 99 __weak_alias(gethostbyaddr,_gethostbyaddr) 100 __weak_alias(gethostbyname,_gethostbyname) 101 #endif 102 103 #define MAXALIASES 35 104 #define MAXADDRS 35 105 106 static const char AskedForGot[] = 107 "gethostby*.getanswer: asked for \"%s\", got \"%s\""; 108 109 static char *h_addr_ptrs[MAXADDRS + 1]; 110 111 #ifdef YP 112 static char *__ypdomain; 113 #endif 114 115 static struct hostent host; 116 static char *host_aliases[MAXALIASES]; 117 static char hostbuf[8*1024]; 118 static u_int32_t host_addr[16 / sizeof(u_int32_t)]; /* IPv4 or IPv6 */ 119 static FILE *hostf = NULL; 120 static int stayopen = 0; 121 122 #define MAXPACKET (64*1024) 123 124 typedef union { 125 HEADER hdr; 126 u_char buf[MAXPACKET]; 127 } querybuf; 128 129 typedef union { 130 int32_t al; 131 char ac; 132 } align; 133 134 #ifdef DEBUG 135 static void dprintf(char *, res_state *, ...) 136 __attribute__((__format__(__printf__, 1, 3))); 137 #endif 138 static struct hostent *getanswer(const querybuf *, int, const char *, int, 139 res_state); 140 static void map_v4v6_address(const char *, char *); 141 static void map_v4v6_hostent(struct hostent *, char **, char *); 142 #ifdef RESOLVSORT 143 static void addrsort(char **, int, res_state *); 144 #endif 145 146 void _sethtent(int); 147 void _endhtent(void); 148 struct hostent *_gethtent(void); 149 void ht_sethostent(int); 150 void ht_endhostent(void); 151 struct hostent *ht_gethostbyname(char *); 152 struct hostent *ht_gethostbyaddr(const char *, int, int); 153 void dns_service(void); 154 #undef dn_skipname 155 int dn_skipname(const u_char *, const u_char *); 156 int _gethtbyaddr(void *, void *, va_list); 157 int _gethtbyname(void *, void *, va_list); 158 struct hostent *_gethtbyname2(const char *, int); 159 int _dns_gethtbyaddr(void *, void *, va_list); 160 int _dns_gethtbyname(void *, void *, va_list); 161 #ifdef YP 162 struct hostent *_yphostent(char *, int); 163 int _yp_gethtbyaddr(void *, void *, va_list); 164 int _yp_gethtbyname(void *, void *, va_list); 165 #endif 166 167 static struct hostent *gethostbyname_internal(const char *, int, res_state); 168 169 static const ns_src default_dns_files[] = { 170 { NSSRC_FILES, NS_SUCCESS }, 171 { NSSRC_DNS, NS_SUCCESS }, 172 { 0 } 173 }; 174 175 176 #ifdef DEBUG 177 static void 178 dprintf(char *msg, res_state res, ...) 179 { 180 _DIAGASSERT(msg != NULL); 181 182 if (res->options & RES_DEBUG) { 183 int save = errno; 184 va_list ap; 185 186 va_start (ap, msg); 187 vprintf(msg, ap); 188 va_end (ap); 189 190 errno = save; 191 } 192 } 193 #else 194 # define dprintf(msg, res, num) /*nada*/ 195 #endif 196 197 #define BOUNDED_INCR(x) \ 198 do { \ 199 cp += (x); \ 200 if (cp > eom) { \ 201 h_errno = NO_RECOVERY; \ 202 return NULL; \ 203 } \ 204 } while (/*CONSTCOND*/0) 205 206 #define BOUNDS_CHECK(ptr, count) \ 207 do { \ 208 if ((ptr) + (count) > eom) { \ 209 h_errno = NO_RECOVERY; \ 210 return NULL; \ 211 } \ 212 } while (/*CONSTCOND*/0) 213 214 static struct hostent * 215 getanswer(const querybuf *answer, int anslen, const char *qname, int qtype, 216 res_state res) 217 { 218 const HEADER *hp; 219 const u_char *cp; 220 int n; 221 const u_char *eom, *erdata; 222 char *bp, **ap, **hap, *ep; 223 int type, class, ancount, qdcount; 224 int haveanswer, had_error; 225 int toobig = 0; 226 char tbuf[MAXDNAME]; 227 const char *tname; 228 int (*name_ok)(const char *); 229 230 _DIAGASSERT(answer != NULL); 231 _DIAGASSERT(qname != NULL); 232 233 tname = qname; 234 host.h_name = NULL; 235 eom = answer->buf + anslen; 236 switch (qtype) { 237 case T_A: 238 case T_AAAA: 239 name_ok = res_hnok; 240 break; 241 case T_PTR: 242 name_ok = res_dnok; 243 break; 244 default: 245 return NULL; /* XXX should be abort(); */ 246 } 247 /* 248 * find first satisfactory answer 249 */ 250 hp = &answer->hdr; 251 ancount = ntohs(hp->ancount); 252 qdcount = ntohs(hp->qdcount); 253 bp = hostbuf; 254 ep = hostbuf + sizeof hostbuf; 255 cp = answer->buf; 256 BOUNDED_INCR(HFIXEDSZ); 257 if (qdcount != 1) { 258 h_errno = NO_RECOVERY; 259 return NULL; 260 } 261 n = dn_expand(answer->buf, eom, cp, bp, ep - bp); 262 if ((n < 0) || !(*name_ok)(bp)) { 263 h_errno = NO_RECOVERY; 264 return NULL; 265 } 266 BOUNDED_INCR(n + QFIXEDSZ); 267 if (qtype == T_A || qtype == T_AAAA) { 268 /* res_send() has already verified that the query name is the 269 * same as the one we sent; this just gets the expanded name 270 * (i.e., with the succeeding search-domain tacked on). 271 */ 272 n = strlen(bp) + 1; /* for the \0 */ 273 if (n >= MAXHOSTNAMELEN) { 274 h_errno = NO_RECOVERY; 275 return NULL; 276 } 277 host.h_name = bp; 278 bp += n; 279 /* The qname can be abbreviated, but h_name is now absolute. */ 280 qname = host.h_name; 281 } 282 ap = host_aliases; 283 *ap = NULL; 284 host.h_aliases = host_aliases; 285 hap = h_addr_ptrs; 286 *hap = NULL; 287 host.h_addr_list = h_addr_ptrs; 288 haveanswer = 0; 289 had_error = 0; 290 while (ancount-- > 0 && cp < eom && !had_error) { 291 n = dn_expand(answer->buf, eom, cp, bp, ep - bp); 292 if ((n < 0) || !(*name_ok)(bp)) { 293 had_error++; 294 continue; 295 } 296 cp += n; /* name */ 297 BOUNDS_CHECK(cp, 3 * INT16SZ + INT32SZ); 298 type = _getshort(cp); 299 cp += INT16SZ; /* type */ 300 class = _getshort(cp); 301 cp += INT16SZ + INT32SZ; /* class, TTL */ 302 n = _getshort(cp); 303 cp += INT16SZ; /* len */ 304 BOUNDS_CHECK(cp, n); 305 erdata = cp + n; 306 if (class != C_IN) { 307 /* XXX - debug? syslog? */ 308 cp += n; 309 continue; /* XXX - had_error++ ? */ 310 } 311 if ((qtype == T_A || qtype == T_AAAA) && type == T_CNAME) { 312 if (ap >= &host_aliases[MAXALIASES-1]) 313 continue; 314 n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf); 315 if ((n < 0) || !(*name_ok)(tbuf)) { 316 had_error++; 317 continue; 318 } 319 cp += n; 320 if (cp != erdata) { 321 h_errno = NO_RECOVERY; 322 return NULL; 323 } 324 /* Store alias. */ 325 *ap++ = bp; 326 n = strlen(bp) + 1; /* for the \0 */ 327 if (n >= MAXHOSTNAMELEN) { 328 had_error++; 329 continue; 330 } 331 bp += n; 332 /* Get canonical name. */ 333 n = strlen(tbuf) + 1; /* for the \0 */ 334 if (n > ep - bp || n >= MAXHOSTNAMELEN) { 335 had_error++; 336 continue; 337 } 338 strlcpy(bp, tbuf, (size_t)(ep - bp)); 339 host.h_name = bp; 340 bp += n; 341 continue; 342 } 343 if (qtype == T_PTR && type == T_CNAME) { 344 n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf); 345 if (n < 0 || !res_dnok(tbuf)) { 346 had_error++; 347 continue; 348 } 349 cp += n; 350 if (cp != erdata) { 351 h_errno = NO_RECOVERY; 352 return NULL; 353 } 354 /* Get canonical name. */ 355 n = strlen(tbuf) + 1; /* for the \0 */ 356 if (n > ep - bp || n >= MAXHOSTNAMELEN) { 357 had_error++; 358 continue; 359 } 360 strlcpy(bp, tbuf, (size_t)(ep - bp)); 361 tname = bp; 362 bp += n; 363 continue; 364 } 365 if (type != qtype) { 366 if (type != T_KEY && type != T_SIG) 367 syslog(LOG_NOTICE|LOG_AUTH, 368 "gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"", 369 qname, p_class(C_IN), p_type(qtype), 370 p_type(type)); 371 cp += n; 372 continue; /* XXX - had_error++ ? */ 373 } 374 switch (type) { 375 case T_PTR: 376 if (strcasecmp(tname, bp) != 0) { 377 syslog(LOG_NOTICE|LOG_AUTH, 378 AskedForGot, qname, bp); 379 cp += n; 380 continue; /* XXX - had_error++ ? */ 381 } 382 n = dn_expand(answer->buf, eom, cp, bp, ep - bp); 383 if ((n < 0) || !res_hnok(bp)) { 384 had_error++; 385 break; 386 } 387 #if MULTI_PTRS_ARE_ALIASES 388 cp += n; 389 if (cp != erdata) { 390 h_errno = NO_RECOVERY; 391 return NULL; 392 } 393 if (!haveanswer) 394 host.h_name = bp; 395 else if (ap < &host_aliases[MAXALIASES-1]) 396 *ap++ = bp; 397 else 398 n = -1; 399 if (n != -1) { 400 n = strlen(bp) + 1; /* for the \0 */ 401 if (n >= MAXHOSTNAMELEN) { 402 had_error++; 403 break; 404 } 405 bp += n; 406 } 407 break; 408 #else 409 host.h_name = bp; 410 if (res->options & RES_USE_INET6) { 411 n = strlen(bp) + 1; /* for the \0 */ 412 if (n >= MAXHOSTNAMELEN) { 413 had_error++; 414 break; 415 } 416 bp += n; 417 map_v4v6_hostent(&host, &bp, ep); 418 } 419 h_errno = NETDB_SUCCESS; 420 return &host; 421 #endif 422 case T_A: 423 case T_AAAA: 424 if (strcasecmp(host.h_name, bp) != 0) { 425 syslog(LOG_NOTICE|LOG_AUTH, 426 AskedForGot, host.h_name, bp); 427 cp += n; 428 continue; /* XXX - had_error++ ? */ 429 } 430 if (n != host.h_length) { 431 cp += n; 432 continue; 433 } 434 if (type == T_AAAA) { 435 struct in6_addr in6; 436 memcpy(&in6, cp, IN6ADDRSZ); 437 if (IN6_IS_ADDR_V4MAPPED(&in6)) { 438 cp += n; 439 continue; 440 } 441 } 442 if (!haveanswer) { 443 int nn; 444 445 host.h_name = bp; 446 nn = strlen(bp) + 1; /* for the \0 */ 447 bp += nn; 448 } 449 450 bp += sizeof(align) - 451 (size_t)((u_long)bp % sizeof(align)); 452 453 if (bp + n >= &hostbuf[sizeof hostbuf]) { 454 dprintf("size (%d) too big\n", res, n); 455 had_error++; 456 continue; 457 } 458 if (hap >= &h_addr_ptrs[MAXADDRS-1]) { 459 if (!toobig++) 460 dprintf("Too many addresses (%d)\n", 461 res, MAXADDRS); 462 cp += n; 463 continue; 464 } 465 (void)memcpy(*hap++ = bp, cp, (size_t)n); 466 bp += n; 467 cp += n; 468 if (cp != erdata) { 469 h_errno = NO_RECOVERY; 470 return NULL; 471 } 472 break; 473 default: 474 abort(); 475 } 476 if (!had_error) 477 haveanswer++; 478 } 479 if (haveanswer) { 480 *ap = NULL; 481 *hap = NULL; 482 # if defined(RESOLVSORT) 483 /* 484 * Note: we sort even if host can take only one address 485 * in its return structures - should give it the "best" 486 * address in that case, not some random one 487 */ 488 if (res->nsort && haveanswer > 1 && qtype == T_A) 489 addrsort(h_addr_ptrs, haveanswer, res); 490 # endif /*RESOLVSORT*/ 491 if (!host.h_name) { 492 n = strlen(qname) + 1; /* for the \0 */ 493 if (n > ep - bp || n >= MAXHOSTNAMELEN) 494 goto no_recovery; 495 strlcpy(bp, qname, (size_t)(ep - bp)); 496 host.h_name = bp; 497 bp += n; 498 } 499 if (res->options & RES_USE_INET6) 500 map_v4v6_hostent(&host, &bp, ep); 501 h_errno = NETDB_SUCCESS; 502 return &host; 503 } 504 no_recovery: 505 h_errno = NO_RECOVERY; 506 return NULL; 507 } 508 509 struct hostent * 510 gethostbyname(const char *name) 511 { 512 struct hostent *hp; 513 res_state res = __res_get_state(); 514 515 _DIAGASSERT(name != NULL); 516 517 if ((res->options & RES_INIT) == 0 && res_ninit(res) == -1) { 518 h_errno = NETDB_INTERNAL; 519 __res_put_state(res); 520 return NULL; 521 } 522 if (res->options & RES_USE_INET6) { 523 hp = gethostbyname_internal(name, AF_INET6, res); 524 if (hp) { 525 __res_put_state(res); 526 return hp; 527 } 528 } 529 hp = gethostbyname_internal(name, AF_INET, res); 530 __res_put_state(res); 531 return hp; 532 } 533 534 struct hostent * 535 gethostbyname2(const char *name, int af) 536 { 537 struct hostent *hp; 538 res_state res = __res_get_state(); 539 hp = gethostbyname_internal(name, af, res); 540 __res_put_state(res); 541 return hp; 542 } 543 544 static struct hostent * 545 gethostbyname_internal(const char *name, int af, res_state res) 546 { 547 const char *cp; 548 char *bp, *ep; 549 int size; 550 struct hostent *hp; 551 static const ns_dtab dtab[] = { 552 NS_FILES_CB(_gethtbyname, NULL) 553 { NSSRC_DNS, _dns_gethtbyname, NULL }, /* force -DHESIOD */ 554 NS_NIS_CB(_yp_gethtbyname, NULL) 555 { 0 } 556 }; 557 558 _DIAGASSERT(name != NULL); 559 560 switch (af) { 561 case AF_INET: 562 size = INADDRSZ; 563 break; 564 case AF_INET6: 565 size = IN6ADDRSZ; 566 break; 567 default: 568 h_errno = NETDB_INTERNAL; 569 errno = EAFNOSUPPORT; 570 return NULL; 571 } 572 573 host.h_addrtype = af; 574 host.h_length = size; 575 576 /* 577 * if there aren't any dots, it could be a user-level alias. 578 * this is also done in res_nquery() since we are not the only 579 * function that looks up host names. 580 */ 581 if (!strchr(name, '.') && (cp = __hostalias(name))) 582 name = cp; 583 584 /* 585 * disallow names consisting only of digits/dots, unless 586 * they end in a dot. 587 */ 588 if (isdigit((u_char) name[0])) 589 for (cp = name;; ++cp) { 590 if (!*cp) { 591 if (*--cp == '.') 592 break; 593 /* 594 * All-numeric, no dot at the end. 595 * Fake up a hostent as if we'd actually 596 * done a lookup. 597 */ 598 if (inet_pton(af, name, 599 (char *)(void *)host_addr) <= 0) { 600 h_errno = HOST_NOT_FOUND; 601 return NULL; 602 } 603 strncpy(hostbuf, name, MAXDNAME); 604 hostbuf[MAXDNAME] = '\0'; 605 bp = hostbuf + MAXDNAME; 606 ep = hostbuf + sizeof hostbuf; 607 host.h_name = hostbuf; 608 host.h_aliases = host_aliases; 609 host_aliases[0] = NULL; 610 h_addr_ptrs[0] = (char *)(void *)host_addr; 611 h_addr_ptrs[1] = NULL; 612 host.h_addr_list = h_addr_ptrs; 613 if (res->options & RES_USE_INET6) 614 map_v4v6_hostent(&host, &bp, ep); 615 h_errno = NETDB_SUCCESS; 616 return &host; 617 } 618 if (!isdigit((u_char) *cp) && *cp != '.') 619 break; 620 } 621 if ((isxdigit((u_char) name[0]) && strchr(name, ':') != NULL) || 622 name[0] == ':') 623 for (cp = name;; ++cp) { 624 if (!*cp) { 625 if (*--cp == '.') 626 break; 627 /* 628 * All-IPv6-legal, no dot at the end. 629 * Fake up a hostent as if we'd actually 630 * done a lookup. 631 */ 632 if (inet_pton(af, name, 633 (char *)(void *)host_addr) <= 0) { 634 h_errno = HOST_NOT_FOUND; 635 return NULL; 636 } 637 strncpy(hostbuf, name, MAXDNAME); 638 hostbuf[MAXDNAME] = '\0'; 639 bp = hostbuf + MAXDNAME; 640 ep = hostbuf + sizeof hostbuf; 641 host.h_name = hostbuf; 642 host.h_aliases = host_aliases; 643 host_aliases[0] = NULL; 644 h_addr_ptrs[0] = (char *)(void *)host_addr; 645 h_addr_ptrs[1] = NULL; 646 host.h_addr_list = h_addr_ptrs; 647 h_errno = NETDB_SUCCESS; 648 return &host; 649 } 650 if (!isxdigit((u_char) *cp) && *cp != ':' && *cp != '.') 651 break; 652 } 653 654 hp = NULL; 655 h_errno = NETDB_INTERNAL; 656 if (nsdispatch(&hp, dtab, NSDB_HOSTS, "gethostbyname", 657 default_dns_files, name, strlen(name), af) != NS_SUCCESS) 658 return NULL; 659 h_errno = NETDB_SUCCESS; 660 return hp; 661 } 662 663 struct hostent * 664 gethostbyaddr(const char *addr, /* XXX should have been def'd as u_char! */ 665 socklen_t len, int af) 666 { 667 const u_char *uaddr = (const u_char *)addr; 668 socklen_t size; 669 struct hostent *hp; 670 static const ns_dtab dtab[] = { 671 NS_FILES_CB(_gethtbyaddr, NULL) 672 { NSSRC_DNS, _dns_gethtbyaddr, NULL }, /* force -DHESIOD */ 673 NS_NIS_CB(_yp_gethtbyaddr, NULL) 674 { 0 } 675 }; 676 677 _DIAGASSERT(addr != NULL); 678 679 if (af == AF_INET6 && len == IN6ADDRSZ && 680 (IN6_IS_ADDR_LINKLOCAL((const struct in6_addr *)(const void *)uaddr) || 681 IN6_IS_ADDR_SITELOCAL((const struct in6_addr *)(const void *)uaddr))) { 682 h_errno = HOST_NOT_FOUND; 683 return NULL; 684 } 685 if (af == AF_INET6 && len == IN6ADDRSZ && 686 (IN6_IS_ADDR_V4MAPPED((const struct in6_addr *)(const void *)uaddr) || 687 IN6_IS_ADDR_V4COMPAT((const struct in6_addr *)(const void *)uaddr))) { 688 /* Unmap. */ 689 addr += IN6ADDRSZ - INADDRSZ; 690 uaddr += IN6ADDRSZ - INADDRSZ; 691 af = AF_INET; 692 len = INADDRSZ; 693 } 694 switch (af) { 695 case AF_INET: 696 size = INADDRSZ; 697 break; 698 case AF_INET6: 699 size = IN6ADDRSZ; 700 break; 701 default: 702 errno = EAFNOSUPPORT; 703 h_errno = NETDB_INTERNAL; 704 return NULL; 705 } 706 if (size != len) { 707 errno = EINVAL; 708 h_errno = NETDB_INTERNAL; 709 return NULL; 710 } 711 hp = NULL; 712 h_errno = NETDB_INTERNAL; 713 if (nsdispatch(&hp, dtab, NSDB_HOSTS, "gethostbyaddr", 714 default_dns_files, uaddr, len, af) != NS_SUCCESS) 715 return NULL; 716 h_errno = NETDB_SUCCESS; 717 return hp; 718 } 719 720 void 721 _sethtent(int f) 722 { 723 if (!hostf) 724 hostf = fopen(_PATH_HOSTS, "r" ); 725 else 726 rewind(hostf); 727 stayopen = f; 728 } 729 730 void 731 _endhtent(void) 732 { 733 if (hostf && !stayopen) { 734 (void) fclose(hostf); 735 hostf = NULL; 736 } 737 } 738 739 struct hostent * 740 _gethtent(void) 741 { 742 char *p; 743 char *cp, **q; 744 int af, len; 745 746 if (!hostf && !(hostf = fopen(_PATH_HOSTS, "r" ))) { 747 h_errno = NETDB_INTERNAL; 748 return NULL; 749 } 750 again: 751 if (!(p = fgets(hostbuf, sizeof hostbuf, hostf))) { 752 h_errno = HOST_NOT_FOUND; 753 return NULL; 754 } 755 if (*p == '#') 756 goto again; 757 if (!(cp = strpbrk(p, "#\n"))) 758 goto again; 759 *cp = '\0'; 760 if (!(cp = strpbrk(p, " \t"))) 761 goto again; 762 *cp++ = '\0'; 763 if (inet_pton(AF_INET6, p, (char *)(void *)host_addr) > 0) { 764 af = AF_INET6; 765 len = IN6ADDRSZ; 766 } else if (inet_pton(AF_INET, p, (char *)(void *)host_addr) > 0) { 767 res_state res = __res_get_state(); 768 if (res->options & RES_USE_INET6) { 769 map_v4v6_address((char *)(void *)host_addr, 770 (char *)(void *)host_addr); 771 af = AF_INET6; 772 len = IN6ADDRSZ; 773 } else { 774 af = AF_INET; 775 len = INADDRSZ; 776 } 777 __res_put_state(res); 778 } else { 779 goto again; 780 } 781 /* if this is not something we're looking for, skip it. */ 782 if (host.h_addrtype != af) 783 goto again; 784 if (host.h_length != len) 785 goto again; 786 h_addr_ptrs[0] = (char *)(void *)host_addr; 787 h_addr_ptrs[1] = NULL; 788 host.h_addr_list = h_addr_ptrs; 789 host.h_length = len; 790 host.h_addrtype = af; 791 while (*cp == ' ' || *cp == '\t') 792 cp++; 793 host.h_name = cp; 794 q = host.h_aliases = host_aliases; 795 if ((cp = strpbrk(cp, " \t")) != NULL) 796 *cp++ = '\0'; 797 while (cp && *cp) { 798 if (*cp == ' ' || *cp == '\t') { 799 cp++; 800 continue; 801 } 802 if (q < &host_aliases[MAXALIASES - 1]) 803 *q++ = cp; 804 if ((cp = strpbrk(cp, " \t")) != NULL) 805 *cp++ = '\0'; 806 } 807 *q = NULL; 808 h_errno = NETDB_SUCCESS; 809 return &host; 810 } 811 812 /*ARGSUSED*/ 813 int 814 _gethtbyname(void *rv, void *cb_data, va_list ap) 815 { 816 struct hostent *hp; 817 const char *name; 818 int af; 819 820 _DIAGASSERT(rv != NULL); 821 822 name = va_arg(ap, char *); 823 /* NOSTRICT skip len */(void)va_arg(ap, int); 824 af = va_arg(ap, int); 825 826 hp = NULL; 827 #if 0 828 { 829 res_state res = __res_get_state(); 830 if (res->options & RES_USE_INET6) 831 hp = _gethtbyname2(name, AF_INET6); 832 if (hp==NULL) 833 hp = _gethtbyname2(name, AF_INET); 834 __res_put_state(res); 835 } 836 #else 837 hp = _gethtbyname2(name, af); 838 #endif 839 *((struct hostent **)rv) = hp; 840 if (hp == NULL) { 841 h_errno = HOST_NOT_FOUND; 842 return NS_NOTFOUND; 843 } 844 return NS_SUCCESS; 845 } 846 847 struct hostent * 848 _gethtbyname2(const char *name, int af) 849 { 850 struct hostent *p; 851 char *tmpbuf, *ptr, **cp; 852 int num; 853 size_t len; 854 855 _DIAGASSERT(name != NULL); 856 857 _sethtent(0); 858 ptr = tmpbuf = NULL; 859 num = 0; 860 while ((p = _gethtent()) != NULL && num < MAXADDRS) { 861 if (p->h_addrtype != af) 862 continue; 863 if (strcasecmp(p->h_name, name) != 0) { 864 for (cp = p->h_aliases; *cp != NULL; cp++) 865 if (strcasecmp(*cp, name) == 0) 866 break; 867 if (*cp == NULL) continue; 868 } 869 870 if (num == 0) { 871 size_t bufsize; 872 char *src; 873 874 bufsize = strlen(p->h_name) + 2 + 875 MAXADDRS * p->h_length + 876 ALIGNBYTES; 877 for (cp = p->h_aliases; *cp != NULL; cp++) 878 bufsize += strlen(*cp) + 1; 879 880 if ((tmpbuf = malloc(bufsize)) == NULL) { 881 h_errno = NETDB_INTERNAL; 882 return NULL; 883 } 884 885 ptr = tmpbuf; 886 src = p->h_name; 887 while ((*ptr++ = *src++) != '\0'); 888 for (cp = p->h_aliases; *cp != NULL; cp++) { 889 src = *cp; 890 while ((*ptr++ = *src++) != '\0'); 891 } 892 *ptr++ = '\0'; 893 894 ptr = (char *)(void *)ALIGN(ptr); 895 } 896 897 (void)memcpy(ptr, p->h_addr_list[0], (size_t)p->h_length); 898 ptr += p->h_length; 899 num++; 900 } 901 _endhtent(); 902 if (num == 0) return NULL; 903 904 len = ptr - tmpbuf; 905 if (len > (sizeof(hostbuf) - ALIGNBYTES)) { 906 free(tmpbuf); 907 errno = ENOSPC; 908 h_errno = NETDB_INTERNAL; 909 return NULL; 910 } 911 ptr = memcpy((void *)ALIGN(hostbuf), tmpbuf, len); 912 free(tmpbuf); 913 914 host.h_name = ptr; 915 while (*ptr++); 916 917 cp = host_aliases; 918 while (*ptr) { 919 *cp++ = ptr; 920 while (*ptr++); 921 } 922 ptr++; 923 *cp = NULL; 924 925 ptr = (char *)(void *)ALIGN(ptr); 926 cp = h_addr_ptrs; 927 while (num--) { 928 *cp++ = ptr; 929 ptr += host.h_length; 930 } 931 *cp = NULL; 932 933 return &host; 934 } 935 936 /*ARGSUSED*/ 937 int 938 _gethtbyaddr(void *rv, void *cb_data, va_list ap) 939 { 940 struct hostent *p; 941 const unsigned char *addr; 942 int len, af; 943 944 _DIAGASSERT(rv != NULL); 945 946 addr = va_arg(ap, unsigned char *); 947 len = va_arg(ap, int); 948 af = va_arg(ap, int); 949 950 host.h_length = len; 951 host.h_addrtype = af; 952 953 _sethtent(0); 954 while ((p = _gethtent()) != NULL) 955 if (p->h_addrtype == af && !memcmp(p->h_addr, addr, 956 (size_t)len)) 957 break; 958 _endhtent(); 959 *((struct hostent **)rv) = p; 960 if (p==NULL) { 961 h_errno = HOST_NOT_FOUND; 962 return NS_NOTFOUND; 963 } 964 return NS_SUCCESS; 965 } 966 967 static void 968 map_v4v6_address(const char *src, char *dst) 969 { 970 u_char *p = (u_char *)dst; 971 char tmp[INADDRSZ]; 972 int i; 973 974 _DIAGASSERT(src != NULL); 975 _DIAGASSERT(dst != NULL); 976 977 /* Stash a temporary copy so our caller can update in place. */ 978 (void)memcpy(tmp, src, INADDRSZ); 979 /* Mark this ipv6 addr as a mapped ipv4. */ 980 for (i = 0; i < 10; i++) 981 *p++ = 0x00; 982 *p++ = 0xff; 983 *p++ = 0xff; 984 /* Retrieve the saved copy and we're done. */ 985 (void)memcpy((void *)p, tmp, INADDRSZ); 986 } 987 988 static void 989 map_v4v6_hostent(struct hostent *hp, char **bpp, char *ep) 990 { 991 char **ap; 992 993 _DIAGASSERT(hp != NULL); 994 _DIAGASSERT(bpp != NULL); 995 _DIAGASSERT(ep != NULL); 996 997 if (hp->h_addrtype != AF_INET || hp->h_length != INADDRSZ) 998 return; 999 hp->h_addrtype = AF_INET6; 1000 hp->h_length = IN6ADDRSZ; 1001 for (ap = hp->h_addr_list; *ap; ap++) { 1002 int i = sizeof(align) - (size_t)((u_long)*bpp % sizeof(align)); 1003 1004 if (ep - *bpp < (i + IN6ADDRSZ)) { 1005 /* Out of memory. Truncate address list here. XXX */ 1006 *ap = NULL; 1007 return; 1008 } 1009 *bpp += i; 1010 map_v4v6_address(*ap, *bpp); 1011 *ap = *bpp; 1012 *bpp += IN6ADDRSZ; 1013 } 1014 } 1015 1016 #ifdef RESOLVSORT 1017 static void 1018 addrsort(char **ap, int num, res_state res) 1019 { 1020 int i, j; 1021 char **p; 1022 short aval[MAXADDRS]; 1023 int needsort = 0; 1024 1025 _DIAGASSERT(ap != NULL); 1026 1027 p = ap; 1028 for (i = 0; i < num; i++, p++) { 1029 for (j = 0 ; (unsigned)j < res->nsort; j++) 1030 if (res->sort_list[j].addr.s_addr == 1031 (((struct in_addr *)(void *)(*p))->s_addr & 1032 res->sort_list[j].mask)) 1033 break; 1034 aval[i] = j; 1035 if (needsort == 0 && i > 0 && j < aval[i-1]) 1036 needsort = i; 1037 } 1038 if (!needsort) 1039 return; 1040 1041 while (needsort < num) { 1042 for (j = needsort - 1; j >= 0; j--) { 1043 if (aval[j] > aval[j+1]) { 1044 char *hp; 1045 1046 i = aval[j]; 1047 aval[j] = aval[j+1]; 1048 aval[j+1] = i; 1049 1050 hp = ap[j]; 1051 ap[j] = ap[j+1]; 1052 ap[j+1] = hp; 1053 } else 1054 break; 1055 } 1056 needsort++; 1057 } 1058 } 1059 #endif 1060 1061 #if defined(BSD43_BSD43_NFS) || defined(sun) 1062 /* XXX: should we remove this cruft? - lukem */ 1063 /* some libc's out there are bound internally to these names (UMIPS) */ 1064 void 1065 ht_sethostent(int stayopen) 1066 { 1067 _sethtent(stayopen); 1068 } 1069 1070 void 1071 ht_endhostent(void) 1072 { 1073 _endhtent(); 1074 } 1075 1076 struct hostent * 1077 ht_gethostbyname(char *name) 1078 { 1079 return _gethtbyname(name); 1080 } 1081 1082 struct hostent * 1083 ht_gethostbyaddr(const char *addr, int len, int af) 1084 { 1085 return _gethtbyaddr(addr, len, af); 1086 } 1087 1088 struct hostent * 1089 gethostent(void) 1090 { 1091 return _gethtent(); 1092 } 1093 1094 void 1095 dns_service(void) 1096 { 1097 return; 1098 } 1099 1100 int 1101 dn_skipname(const u_char *comp_dn, const u_char *eom) 1102 { 1103 return __dn_skipname(comp_dn, eom); 1104 } 1105 #endif /*old-style libc with yp junk in it*/ 1106 1107 /*ARGSUSED*/ 1108 int 1109 _dns_gethtbyname(rv, cb_data, ap) 1110 void *rv; 1111 void *cb_data; 1112 va_list ap; 1113 { 1114 querybuf *buf; 1115 int n, type; 1116 struct hostent *hp; 1117 const char *name; 1118 int af; 1119 res_state res; 1120 1121 _DIAGASSERT(rv != NULL); 1122 1123 name = va_arg(ap, char *); 1124 /* NOSTRICT skip len */(void)va_arg(ap, int); 1125 af = va_arg(ap, int); 1126 1127 switch (af) { 1128 case AF_INET: 1129 type = T_A; 1130 break; 1131 case AF_INET6: 1132 type = T_AAAA; 1133 break; 1134 default: 1135 return NS_UNAVAIL; 1136 } 1137 buf = malloc(sizeof(*buf)); 1138 if (buf == NULL) { 1139 h_errno = NETDB_INTERNAL; 1140 return NS_NOTFOUND; 1141 } 1142 res = __res_get_state(); 1143 n = res_nsearch(res, name, C_IN, type, buf->buf, sizeof(buf->buf)); 1144 if (n < 0) { 1145 free(buf); 1146 dprintf("res_nsearch failed (%d)\n", res, n); 1147 __res_put_state(res); 1148 return NS_NOTFOUND; 1149 } 1150 hp = getanswer(buf, n, name, type, res); 1151 free(buf); 1152 __res_put_state(res); 1153 if (hp == NULL) 1154 switch (h_errno) { 1155 case HOST_NOT_FOUND: 1156 return NS_NOTFOUND; 1157 case TRY_AGAIN: 1158 return NS_TRYAGAIN; 1159 default: 1160 return NS_UNAVAIL; 1161 } 1162 *((struct hostent **)rv) = hp; 1163 return NS_SUCCESS; 1164 } 1165 1166 /*ARGSUSED*/ 1167 int 1168 _dns_gethtbyaddr(void *rv, void *cb_data, va_list ap) 1169 { 1170 char qbuf[MAXDNAME + 1], *qp, *ep; 1171 int n; 1172 querybuf *buf; 1173 struct hostent *hp; 1174 const unsigned char *uaddr; 1175 int len, af, advance; 1176 res_state res; 1177 1178 _DIAGASSERT(rv != NULL); 1179 1180 uaddr = va_arg(ap, unsigned char *); 1181 len = va_arg(ap, int); 1182 af = va_arg(ap, int); 1183 1184 switch (af) { 1185 case AF_INET: 1186 (void)snprintf(qbuf, sizeof(qbuf), "%u.%u.%u.%u.in-addr.arpa", 1187 (uaddr[3] & 0xff), (uaddr[2] & 0xff), 1188 (uaddr[1] & 0xff), (uaddr[0] & 0xff)); 1189 break; 1190 1191 case AF_INET6: 1192 qp = qbuf; 1193 ep = qbuf + sizeof(qbuf) - 1; 1194 for (n = IN6ADDRSZ - 1; n >= 0; n--) { 1195 advance = snprintf(qp, (size_t)(ep - qp), "%x.%x.", 1196 uaddr[n] & 0xf, 1197 ((unsigned int)uaddr[n] >> 4) & 0xf); 1198 if (advance > 0 && qp + advance < ep) 1199 qp += advance; 1200 else { 1201 h_errno = NETDB_INTERNAL; 1202 return NS_NOTFOUND; 1203 } 1204 } 1205 if (strlcat(qbuf, "ip6.arpa", sizeof(qbuf)) >= sizeof(qbuf)) { 1206 h_errno = NETDB_INTERNAL; 1207 return NS_NOTFOUND; 1208 } 1209 break; 1210 default: 1211 abort(); 1212 } 1213 1214 buf = malloc(sizeof(*buf)); 1215 if (buf == NULL) { 1216 h_errno = NETDB_INTERNAL; 1217 return NS_NOTFOUND; 1218 } 1219 res = __res_get_state(); 1220 n = res_nquery(res, qbuf, C_IN, T_PTR, buf->buf, sizeof(buf->buf)); 1221 if (n < 0 && af == AF_INET6) { 1222 *qp = '\0'; 1223 if (strlcat(qbuf, "ip6.int", sizeof(qbuf)) >= sizeof(qbuf)) { 1224 free(buf); 1225 h_errno = NETDB_INTERNAL; 1226 __res_put_state(res); 1227 return NS_NOTFOUND; 1228 } 1229 n = res_nquery(res, qbuf, C_IN, T_PTR, buf->buf, sizeof(buf->buf)); 1230 } 1231 if (n < 0) { 1232 free(buf); 1233 dprintf("res_nquery failed (%d)\n", res, n); 1234 __res_put_state(res); 1235 return NS_NOTFOUND; 1236 } 1237 hp = getanswer(buf, n, qbuf, T_PTR, res); 1238 free(buf); 1239 if (hp == NULL) { 1240 __res_put_state(res); 1241 switch (h_errno) { 1242 case HOST_NOT_FOUND: 1243 return NS_NOTFOUND; 1244 case TRY_AGAIN: 1245 return NS_TRYAGAIN; 1246 default: 1247 return NS_UNAVAIL; 1248 } 1249 } 1250 hp->h_addrtype = af; 1251 hp->h_length = len; 1252 (void)memcpy(host_addr, uaddr, (size_t)len); 1253 h_addr_ptrs[0] = (char *)(void *)host_addr; 1254 h_addr_ptrs[1] = NULL; 1255 if (af == AF_INET && (res->options & RES_USE_INET6)) { 1256 map_v4v6_address((char *)(void *)host_addr, 1257 (char *)(void *)host_addr); 1258 hp->h_addrtype = AF_INET6; 1259 hp->h_length = IN6ADDRSZ; 1260 } 1261 1262 __res_put_state(res); 1263 *((struct hostent **)rv) = hp; 1264 h_errno = NETDB_SUCCESS; 1265 return NS_SUCCESS; 1266 } 1267 1268 #ifdef YP 1269 /*ARGSUSED*/ 1270 struct hostent * 1271 _yphostent(char *line, int af) 1272 { 1273 static struct in_addr host_addrs[MAXADDRS]; 1274 static struct in6_addr host6_addrs[MAXADDRS]; 1275 char *p = line; 1276 char *cp, **q; 1277 char **hap; 1278 int addrok; 1279 int more; 1280 size_t naddrs; 1281 1282 _DIAGASSERT(line != NULL); 1283 1284 host.h_name = NULL; 1285 host.h_addr_list = h_addr_ptrs; 1286 host.h_addrtype = af; 1287 switch (af) { 1288 case AF_INET: 1289 host.h_length = INADDRSZ; 1290 break; 1291 case AF_INET6: 1292 host.h_length = IN6ADDRSZ; 1293 break; 1294 default: 1295 return NULL; 1296 } 1297 hap = h_addr_ptrs; 1298 q = host.h_aliases = host_aliases; 1299 naddrs = 0; 1300 1301 nextline: 1302 /* check for host_addrs overflow */ 1303 if (naddrs >= sizeof(host_addrs) / sizeof(host_addrs[0])) 1304 goto done; 1305 if (naddrs >= sizeof(host6_addrs) / sizeof(host6_addrs[0])) 1306 goto done; 1307 1308 more = 0; 1309 cp = strpbrk(p, " \t"); 1310 if (cp == NULL) 1311 goto done; 1312 *cp++ = '\0'; 1313 1314 /* p has should have an address */ 1315 switch (af) { 1316 case AF_INET: 1317 addrok = inet_aton(p, &host_addrs[naddrs]); 1318 break; 1319 case AF_INET6: 1320 addrok = inet_pton(af, p, &host6_addrs[naddrs]); 1321 break; 1322 } 1323 if (addrok != 1) { 1324 /* skip to the next line */ 1325 while (cp && *cp) { 1326 if (*cp == '\n') { 1327 cp++; 1328 goto nextline; 1329 } 1330 cp++; 1331 } 1332 1333 goto done; 1334 } 1335 1336 switch (af) { 1337 case AF_INET: 1338 *hap++ = (char *)(void *)&host_addrs[naddrs++]; 1339 break; 1340 case AF_INET6: 1341 *hap++ = (char *)(void *)&host6_addrs[naddrs++]; 1342 break; 1343 } 1344 1345 while (*cp == ' ' || *cp == '\t') 1346 cp++; 1347 p = cp; 1348 cp = strpbrk(p, " \t\n"); 1349 if (cp != NULL) { 1350 if (*cp == '\n') 1351 more = 1; 1352 *cp++ = '\0'; 1353 } 1354 if (!host.h_name) 1355 host.h_name = p; 1356 else if (strcmp(host.h_name, p)==0) 1357 ; 1358 else if (q < &host_aliases[MAXALIASES - 1]) 1359 *q++ = p; 1360 p = cp; 1361 if (more) 1362 goto nextline; 1363 1364 while (cp && *cp) { 1365 if (*cp == ' ' || *cp == '\t') { 1366 cp++; 1367 continue; 1368 } 1369 if (*cp == '\n') { 1370 cp++; 1371 goto nextline; 1372 } 1373 if (q < &host_aliases[MAXALIASES - 1]) 1374 *q++ = cp; 1375 cp = strpbrk(cp, " \t"); 1376 if (cp != NULL) 1377 *cp++ = '\0'; 1378 } 1379 1380 done: 1381 if (host.h_name == NULL) 1382 return NULL; 1383 *q = NULL; 1384 *hap = NULL; 1385 return &host; 1386 } 1387 1388 /*ARGSUSED*/ 1389 int 1390 _yp_gethtbyaddr(void *rv, void *cb_data, va_list ap) 1391 { 1392 struct hostent *hp = NULL; 1393 static char *__ypcurrent; 1394 int __ypcurrentlen, r; 1395 char name[INET6_ADDRSTRLEN]; /* XXX enough? */ 1396 const unsigned char *uaddr; 1397 int af; 1398 const char *map; 1399 1400 _DIAGASSERT(rv != NULL); 1401 1402 uaddr = va_arg(ap, unsigned char *); 1403 /* NOSTRICT skip len */(void)va_arg(ap, int); 1404 af = va_arg(ap, int); 1405 1406 if (!__ypdomain) { 1407 if (_yp_check(&__ypdomain) == 0) 1408 return NS_UNAVAIL; 1409 } 1410 /* 1411 * XXX unfortunately, we cannot support IPv6 extended scoped address 1412 * notation here. gethostbyaddr() is not scope-aware. too bad. 1413 */ 1414 if (inet_ntop(af, uaddr, name, sizeof(name)) == NULL) 1415 return NS_UNAVAIL; 1416 if (__ypcurrent) 1417 free(__ypcurrent); 1418 __ypcurrent = NULL; 1419 switch (af) { 1420 case AF_INET: 1421 map = "hosts.byaddr"; 1422 break; 1423 default: 1424 map = "ipnodes.byaddr"; 1425 break; 1426 } 1427 r = yp_match(__ypdomain, map, name, 1428 (int)strlen(name), &__ypcurrent, &__ypcurrentlen); 1429 if (r == 0) 1430 hp = _yphostent(__ypcurrent, af); 1431 if (hp == NULL) { 1432 h_errno = HOST_NOT_FOUND; 1433 return NS_NOTFOUND; 1434 } 1435 *((struct hostent **)rv) = hp; 1436 return NS_SUCCESS; 1437 } 1438 1439 /*ARGSUSED*/ 1440 int 1441 _yp_gethtbyname(void *rv, void *cb_data, va_list ap) 1442 { 1443 struct hostent *hp = NULL; 1444 static char *__ypcurrent; 1445 int __ypcurrentlen, r; 1446 const char *name; 1447 int af; 1448 const char *map; 1449 1450 _DIAGASSERT(rv != NULL); 1451 1452 name = va_arg(ap, char *); 1453 /* NOSTRICT skip len */(void)va_arg(ap, int); 1454 af = va_arg(ap, int); 1455 1456 if (!__ypdomain) { 1457 if (_yp_check(&__ypdomain) == 0) 1458 return NS_UNAVAIL; 1459 } 1460 if (__ypcurrent) 1461 free(__ypcurrent); 1462 __ypcurrent = NULL; 1463 switch (af) { 1464 case AF_INET: 1465 map = "hosts.byname"; 1466 break; 1467 default: 1468 map = "ipnodes.byname"; 1469 break; 1470 } 1471 r = yp_match(__ypdomain, map, name, 1472 (int)strlen(name), &__ypcurrent, &__ypcurrentlen); 1473 if (r == 0) 1474 hp = _yphostent(__ypcurrent, af); 1475 if (hp == NULL) { 1476 h_errno = HOST_NOT_FOUND; 1477 return NS_NOTFOUND; 1478 } 1479 *((struct hostent **)rv) = hp; 1480 return NS_SUCCESS; 1481 } 1482 #endif 1483
Indexes created Sat Sep 27 22:09:54 GMT 2025