1/* 2 * ++Copyright++ 1985, 1988, 1993 3 * - 4 * Copyright (c) 1985, 1988, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 4. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * - 31 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 32 * 33 * Permission to use, copy, modify, and distribute this software for any 34 * purpose with or without fee is hereby granted, provided that the above 35 * copyright notice and this permission notice appear in all copies, and that 36 * the name of Digital Equipment Corporation not be used in advertising or 37 * publicity pertaining to distribution of the document or software without 38 * specific, written prior permission. 39 * 40 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 41 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 42 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 43 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 44 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 45 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 46 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 47 * SOFTWARE. 48 * - 49 * --Copyright-- 50 */ 51 52#if defined(LIBC_SCCS) && !defined(lint) 53static char sccsid[] = "@(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93"; 54static char fromrcsid[] = "From: Id: gethnamaddr.c,v 8.23 1998/04/07 04:59:46 vixie Exp $"; 55#endif /* LIBC_SCCS and not lint */ 56#include <sys/cdefs.h> 57__FBSDID("$FreeBSD$"); 58 59#include <sys/types.h> 60#include <sys/param.h> 61#include <sys/socket.h> 62#include <netinet/in.h> 63#include <arpa/inet.h> 64#include <arpa/nameser.h> 65 66#include <stdio.h> 67#include <stdlib.h> 68#include <unistd.h> 69#include <string.h> 70#include <netdb.h> 71#include <resolv.h> 72#include <ctype.h> 73#include <errno.h> 74#include <syslog.h> 75#include <stdarg.h> 76#include <nsswitch.h> 77 78#include "netdb_private.h" 79#include "res_config.h" 80 81#define SPRINTF(x) ((size_t)sprintf x) 82 83static const char AskedForGot[] = 84 "gethostby*.gethostanswer: asked for \"%s\", got \"%s\""; 85 86#ifdef RESOLVSORT 87static void addrsort(char **, int, res_state); 88#endif 89 90#ifdef DEBUG 91static void dprintf(char *, int, res_state) __printflike(1, 0); 92#endif 93 94#define MAXPACKET (64*1024) 95 96typedef union { 97 HEADER hdr; 98 u_char buf[MAXPACKET]; 99} querybuf; 100 101typedef union { 102 int32_t al; 103 char ac; 104} align; 105 106int _dns_ttl_; 107 108#ifdef DEBUG 109static void 110dprintf(msg, num, res) 111 char *msg; 112 int num; 113 res_state res; 114{ 115 if (res->options & RES_DEBUG) { 116 int save = errno; 117 118 printf(msg, num); 119 errno = save; 120 } 121} 122#else 123# define dprintf(msg, num, res) /*nada*/ 124#endif 125 126#define BOUNDED_INCR(x) \ 127 do { \ 128 cp += x; \ 129 if (cp > eom) { \ 130 RES_SET_H_ERRNO(statp, NO_RECOVERY); \ 131 return (-1); \ 132 } \ 133 } while (0) 134 135#define BOUNDS_CHECK(ptr, count) \ 136 do { \ 137 if ((ptr) + (count) > eom) { \ 138 RES_SET_H_ERRNO(statp, NO_RECOVERY); \ 139 return (-1); \ 140 } \ 141 } while (0) 142 143static int 144gethostanswer(const querybuf *answer, int anslen, const char *qname, int qtype, 145 struct hostent *he, struct hostent_data *hed, res_state statp) 146{ 147 const HEADER *hp; 148 const u_char *cp; 149 int n; 150 const u_char *eom, *erdata; 151 char *bp, *ep, **ap, **hap; 152 int type, class, ancount, qdcount; 153 int haveanswer, had_error; 154 int toobig = 0; 155 char tbuf[MAXDNAME]; 156 const char *tname; 157 int (*name_ok)(const char *); 158 159 tname = qname; 160 he->h_name = NULL; 161 eom = answer->buf + anslen; 162 switch (qtype) { 163 case T_A: 164 case T_AAAA: 165 name_ok = res_hnok; 166 break; 167 case T_PTR: 168 name_ok = res_dnok; 169 break; 170 default: 171 RES_SET_H_ERRNO(statp, NO_RECOVERY); 172 return (-1); /* XXX should be abort(); */ 173 } 174 /* 175 * find first satisfactory answer 176 */ 177 hp = &answer->hdr; 178 ancount = ntohs(hp->ancount); 179 qdcount = ntohs(hp->qdcount); 180 bp = hed->hostbuf; 181 ep = hed->hostbuf + sizeof hed->hostbuf; 182 cp = answer->buf; 183 BOUNDED_INCR(HFIXEDSZ); 184 if (qdcount != 1) { 185 RES_SET_H_ERRNO(statp, NO_RECOVERY); 186 return (-1); 187 } 188 n = dn_expand(answer->buf, eom, cp, bp, ep - bp); 189 if ((n < 0) || !(*name_ok)(bp)) { 190 RES_SET_H_ERRNO(statp, NO_RECOVERY); 191 return (-1); 192 } 193 BOUNDED_INCR(n + QFIXEDSZ); 194 if (qtype == T_A || qtype == T_AAAA) { 195 /* res_send() has already verified that the query name is the 196 * same as the one we sent; this just gets the expanded name 197 * (i.e., with the succeeding search-domain tacked on). 198 */ 199 n = strlen(bp) + 1; /* for the \0 */ 200 if (n >= MAXHOSTNAMELEN) { 201 RES_SET_H_ERRNO(statp, NO_RECOVERY); 202 return (-1); 203 } 204 he->h_name = bp; 205 bp += n; 206 /* The qname can be abbreviated, but h_name is now absolute. */ 207 qname = he->h_name; 208 } 209 ap = hed->host_aliases; 210 *ap = NULL; 211 he->h_aliases = hed->host_aliases; 212 hap = hed->h_addr_ptrs; 213 *hap = NULL; 214 he->h_addr_list = hed->h_addr_ptrs; 215 haveanswer = 0; 216 had_error = 0; 217 _dns_ttl_ = -1; 218 while (ancount-- > 0 && cp < eom && !had_error) { 219 n = dn_expand(answer->buf, eom, cp, bp, ep - bp); 220 if ((n < 0) || !(*name_ok)(bp)) { 221 had_error++; 222 continue; 223 } 224 cp += n; /* name */ 225 BOUNDS_CHECK(cp, 3 * INT16SZ + INT32SZ); 226 type = _getshort(cp); 227 cp += INT16SZ; /* type */ 228 class = _getshort(cp); 229 cp += INT16SZ; /* class */ 230 if (qtype == T_A && type == T_A) 231 _dns_ttl_ = _getlong(cp); 232 cp += INT32SZ; /* TTL */ 233 n = _getshort(cp); 234 cp += INT16SZ; /* len */ 235 BOUNDS_CHECK(cp, n); 236 erdata = cp + n; 237 if (class != C_IN) { 238 /* XXX - debug? syslog? */ 239 cp += n; 240 continue; /* XXX - had_error++ ? */ 241 } 242 if ((qtype == T_A || qtype == T_AAAA) && type == T_CNAME) { 243 if (ap >= &hed->host_aliases[_MAXALIASES-1]) 244 continue; 245 n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf); 246 if ((n < 0) || !(*name_ok)(tbuf)) { 247 had_error++; 248 continue; 249 } 250 cp += n; 251 if (cp != erdata) { 252 RES_SET_H_ERRNO(statp, NO_RECOVERY); 253 return (-1); 254 } 255 /* Store alias. */ 256 *ap++ = bp; 257 n = strlen(bp) + 1; /* for the \0 */ 258 if (n >= MAXHOSTNAMELEN) { 259 had_error++; 260 continue; 261 } 262 bp += n; 263 /* Get canonical name. */ 264 n = strlen(tbuf) + 1; /* for the \0 */ 265 if (n > ep - bp || n >= MAXHOSTNAMELEN) { 266 had_error++; 267 continue; 268 } 269 strcpy(bp, tbuf); 270 he->h_name = bp; 271 bp += n; 272 continue; 273 } 274 if (qtype == T_PTR && type == T_CNAME) { 275 n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf); 276 if (n < 0 || !res_dnok(tbuf)) { 277 had_error++; 278 continue; 279 } 280 cp += n; 281 if (cp != erdata) { 282 RES_SET_H_ERRNO(statp, NO_RECOVERY); 283 return (-1); 284 } 285 /* Get canonical name. */ 286 n = strlen(tbuf) + 1; /* for the \0 */ 287 if (n > ep - bp || n >= MAXHOSTNAMELEN) { 288 had_error++; 289 continue; 290 } 291 strcpy(bp, tbuf); 292 tname = bp; 293 bp += n; 294 continue; 295 } 296 if (type != qtype) { 297 if (type != T_SIG && type != ns_t_dname) 298 syslog(LOG_NOTICE|LOG_AUTH, 299 "gethostby*.gethostanswer: asked for \"%s %s %s\", got type \"%s\"", 300 qname, p_class(C_IN), p_type(qtype), 301 p_type(type)); 302 cp += n; 303 continue; /* XXX - had_error++ ? */ 304 } 305 switch (type) { 306 case T_PTR: 307 if (strcasecmp(tname, bp) != 0) { 308 syslog(LOG_NOTICE|LOG_AUTH, 309 AskedForGot, qname, bp); 310 cp += n; 311 continue; /* XXX - had_error++ ? */ 312 } 313 n = dn_expand(answer->buf, eom, cp, bp, ep - bp); 314 if ((n < 0) || !res_hnok(bp)) { 315 had_error++; 316 break; 317 } 318#if MULTI_PTRS_ARE_ALIASES 319 cp += n; 320 if (cp != erdata) { 321 RES_SET_H_ERRNO(statp, NO_RECOVERY); 322 return (-1); 323 } 324 if (!haveanswer) 325 he->h_name = bp; 326 else if (ap < &hed->host_aliases[_MAXALIASES-1]) 327 *ap++ = bp; 328 else 329 n = -1; 330 if (n != -1) { 331 n = strlen(bp) + 1; /* for the \0 */ 332 if (n >= MAXHOSTNAMELEN) { 333 had_error++; 334 break; 335 } 336 bp += n; 337 } 338 break; 339#else 340 he->h_name = bp; 341 if (statp->options & RES_USE_INET6) { 342 n = strlen(bp) + 1; /* for the \0 */ 343 if (n >= MAXHOSTNAMELEN) { 344 had_error++; 345 break; 346 } 347 bp += n; 348 _map_v4v6_hostent(he, &bp, ep); 349 } 350 RES_SET_H_ERRNO(statp, NETDB_SUCCESS); 351 return (0); 352#endif 353 case T_A: 354 case T_AAAA: 355 if (strcasecmp(he->h_name, bp) != 0) { 356 syslog(LOG_NOTICE|LOG_AUTH, 357 AskedForGot, he->h_name, bp); 358 cp += n; 359 continue; /* XXX - had_error++ ? */ 360 } 361 if (n != he->h_length) { 362 cp += n; 363 continue; 364 } 365 if (!haveanswer) { 366 int nn; 367 368 he->h_name = bp; 369 nn = strlen(bp) + 1; /* for the \0 */ 370 bp += nn; 371 } 372 373 bp += sizeof(align) - ((u_long)bp % sizeof(align)); 374 375 if (bp + n >= ep) { 376 dprintf("size (%d) too big\n", n, statp); 377 had_error++; 378 continue; 379 } 380 if (hap >= &hed->h_addr_ptrs[_MAXADDRS-1]) { 381 if (!toobig++) 382 dprintf("Too many addresses (%d)\n", 383 _MAXADDRS, statp); 384 cp += n; 385 continue; 386 } 387 memcpy(*hap++ = bp, cp, n); 388 bp += n; 389 cp += n; 390 if (cp != erdata) { 391 RES_SET_H_ERRNO(statp, NO_RECOVERY); 392 return (-1); 393 } 394 break; 395 default: 396 dprintf("Impossible condition (type=%d)\n", type, 397 statp); 398 RES_SET_H_ERRNO(statp, NO_RECOVERY); 399 return (-1); 400 /* BIND has abort() here, too risky on bad data */ 401 } 402 if (!had_error) 403 haveanswer++; 404 } 405 if (haveanswer) { 406 *ap = NULL; 407 *hap = NULL; 408# if defined(RESOLVSORT) 409 /* 410 * Note: we sort even if host can take only one address 411 * in its return structures - should give it the "best" 412 * address in that case, not some random one 413 */ 414 if (statp->nsort && haveanswer > 1 && qtype == T_A) 415 addrsort(hed->h_addr_ptrs, haveanswer, statp); 416# endif /*RESOLVSORT*/ 417 if (!he->h_name) { 418 n = strlen(qname) + 1; /* for the \0 */ 419 if (n > ep - bp || n >= MAXHOSTNAMELEN) 420 goto no_recovery; 421 strcpy(bp, qname); 422 he->h_name = bp; 423 bp += n; 424 } 425 if (statp->options & RES_USE_INET6) 426 _map_v4v6_hostent(he, &bp, ep); 427 RES_SET_H_ERRNO(statp, NETDB_SUCCESS); 428 return (0); 429 } 430 no_recovery: 431 RES_SET_H_ERRNO(statp, NO_RECOVERY); 432 return (-1); 433} 434 435/* XXX: for async DNS resolver in ypserv */ 436struct hostent * 437__dns_getanswer(const char *answer, int anslen, const char *qname, int qtype) 438{ 439 struct hostent *he; 440 struct hostent_data *hed; 441 int error; 442 res_state statp; 443 444 statp = __res_state(); 445 if ((he = __hostent_init()) == NULL || 446 (hed = __hostent_data_init()) == NULL) { 447 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 448 return (NULL); 449 } 450 switch (qtype) { 451 case T_AAAA: 452 he->h_addrtype = AF_INET6; 453 he->h_length = NS_IN6ADDRSZ; 454 break; 455 case T_A: 456 default: 457 he->h_addrtype = AF_INET; 458 he->h_length = NS_INADDRSZ; 459 break; 460 } 461 462 error = gethostanswer((const querybuf *)answer, anslen, qname, qtype, 463 he, hed, statp); 464 return (error == 0) ? he : NULL; 465} 466 467int 468_dns_gethostbyname(void *rval, void *cb_data, va_list ap) 469{ 470 const char *name; 471 int af; 472 char *buffer; 473 size_t buflen; 474 int *errnop, *h_errnop; 475 struct hostent *hptr, he; 476 struct hostent_data *hed; 477 querybuf *buf; 478 int n, type, error; 479 res_state statp; 480 481 name = va_arg(ap, const char *); 482 af = va_arg(ap, int); 483 hptr = va_arg(ap, struct hostent *); 484 buffer = va_arg(ap, char *); 485 buflen = va_arg(ap, size_t); 486 errnop = va_arg(ap, int *); 487 h_errnop = va_arg(ap, int *); 488 489 *((struct hostent **)rval) = NULL; 490 491 statp = __res_state(); 492 if ((hed = __hostent_data_init()) == NULL) { 493 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 494 *h_errnop = statp->res_h_errno; 495 return (NS_NOTFOUND); 496 } 497 498 he.h_addrtype = af; 499 switch (af) { 500 case AF_INET: 501 he.h_length = NS_INADDRSZ; 502 type = T_A; 503 break; 504 case AF_INET6: 505 he.h_length = NS_IN6ADDRSZ; 506 type = T_AAAA; 507 break; 508 default: 509 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 510 *h_errnop = statp->res_h_errno; 511 errno = EAFNOSUPPORT; 512 return (NS_UNAVAIL); 513 } 514 515 if ((buf = malloc(sizeof(*buf))) == NULL) { 516 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 517 *h_errnop = statp->res_h_errno; 518 return (NS_NOTFOUND); 519 } 520 n = res_nsearch(statp, name, C_IN, type, buf->buf, sizeof(buf->buf)); 521 if (n < 0) { 522 free(buf); 523 dprintf("res_nsearch failed (%d)\n", n, statp); 524 *h_errnop = statp->res_h_errno; 525 return (NS_NOTFOUND); 526 } else if (n > sizeof(buf->buf)) { 527 free(buf); 528 dprintf("static buffer is too small (%d)\n", n, statp); 529 *h_errnop = statp->res_h_errno; 530 return (NS_UNAVAIL); 531 } 532 error = gethostanswer(buf, n, name, type, &he, hed, statp); 533 free(buf); 534 if (error != 0) { 535 *h_errnop = statp->res_h_errno; 536 switch (statp->res_h_errno) { 537 case HOST_NOT_FOUND: 538 return (NS_NOTFOUND); 539 case TRY_AGAIN: 540 return (NS_TRYAGAIN); 541 default: 542 return (NS_UNAVAIL); 543 } 544 /*NOTREACHED*/ 545 } 546 if (__copy_hostent(&he, hptr, buffer, buflen) != 0) { 547 *errnop = errno; 548 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 549 *h_errnop = statp->res_h_errno; 550 return (NS_RETURN); 551 } 552 RES_SET_H_ERRNO(statp, NETDB_SUCCESS); 553 *((struct hostent **)rval) = hptr; 554 return (NS_SUCCESS); 555} 556 557int 558_dns_gethostbyaddr(void *rval, void *cb_data, va_list ap) 559{ 560 const void *addr; 561 socklen_t len; 562 int af; 563 char *buffer; 564 size_t buflen; 565 int *errnop, *h_errnop; 566 const u_char *uaddr; 567 struct hostent *hptr, he; 568 struct hostent_data *hed; 569 int n; 570 querybuf *buf; 571 char qbuf[MAXDNAME+1], *qp; 572 res_state statp; 573#ifdef SUNSECURITY 574 struct hostdata rhd; 575 struct hostent *rhe; 576 char **haddr; 577 u_long old_options; 578 char hname2[MAXDNAME+1], numaddr[46]; 579 int ret_h_error; 580#endif /*SUNSECURITY*/ 581 582 addr = va_arg(ap, const void *); 583 len = va_arg(ap, socklen_t); 584 af = va_arg(ap, int); 585 hptr = va_arg(ap, struct hostent *); 586 buffer = va_arg(ap, char *); 587 buflen = va_arg(ap, size_t); 588 errnop = va_arg(ap, int *); 589 h_errnop = va_arg(ap, int *); 590 uaddr = (const u_char *)addr; 591 592 *((struct hostent **)rval) = NULL; 593 594 statp = __res_state(); 595 if ((hed = __hostent_data_init()) == NULL) { 596 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 597 *h_errnop = statp->res_h_errno; 598 return (NS_NOTFOUND); 599 } 600 601 switch (af) { 602 case AF_INET: 603 (void) sprintf(qbuf, "%u.%u.%u.%u.in-addr.arpa", 604 (uaddr[3] & 0xff), 605 (uaddr[2] & 0xff), 606 (uaddr[1] & 0xff), 607 (uaddr[0] & 0xff)); 608 break; 609 case AF_INET6: 610 qp = qbuf; 611 for (n = NS_IN6ADDRSZ - 1; n >= 0; n--) { 612 qp += SPRINTF((qp, "%x.%x.", 613 uaddr[n] & 0xf, 614 (uaddr[n] >> 4) & 0xf)); 615 } 616 strlcat(qbuf, "ip6.arpa", sizeof(qbuf)); 617 break; 618 default: 619 abort(); 620 } 621 if ((buf = malloc(sizeof(*buf))) == NULL) { 622 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 623 *h_errnop = statp->res_h_errno; 624 return NS_NOTFOUND; 625 } 626 n = res_nquery(statp, qbuf, C_IN, T_PTR, (u_char *)buf->buf, 627 sizeof buf->buf); 628 if (n < 0) { 629 free(buf); 630 dprintf("res_nquery failed (%d)\n", n, statp); 631 *h_errnop = statp->res_h_errno; 632 return (NS_UNAVAIL); 633 } 634 if (n > sizeof buf->buf) { 635 free(buf); 636 dprintf("static buffer is too small (%d)\n", n, statp); 637 *h_errnop = statp->res_h_errno; 638 return (NS_UNAVAIL); 639 } 640 if (gethostanswer(buf, n, qbuf, T_PTR, &he, hed, statp) != 0) { 641 free(buf); 642 *h_errnop = statp->res_h_errno; 643 switch (statp->res_h_errno) { 644 case HOST_NOT_FOUND: 645 return (NS_NOTFOUND); 646 case TRY_AGAIN: 647 return (NS_TRYAGAIN); 648 default: 649 return (NS_UNAVAIL); 650 } 651 /*NOTREACHED*/ 652 } 653 free(buf); 654#ifdef SUNSECURITY 655 if (af == AF_INET) { 656 /* 657 * turn off search as the name should be absolute, 658 * 'localhost' should be matched by defnames 659 */ 660 strncpy(hname2, he.h_name, MAXDNAME); 661 hname2[MAXDNAME] = '\0'; 662 old_options = statp->options; 663 statp->options &= ~RES_DNSRCH; 664 statp->options |= RES_DEFNAMES; 665 memset(&rhd, 0, sizeof rhd); 666 rhe = gethostbyname_r(hname2, &rhd.host, &rhd.data, 667 sizeof(rhd.data), &ret_h_error); 668 if (rhe == NULL) { 669 if (inet_ntop(af, addr, numaddr, sizeof(numaddr)) == NULL) 670 strlcpy(numaddr, "UNKNOWN", sizeof(numaddr)); 671 syslog(LOG_NOTICE|LOG_AUTH, 672 "gethostbyaddr: No A record for %s (verifying [%s])", 673 hname2, numaddr); 674 statp->options = old_options; 675 RES_SET_H_ERRNO(statp, HOST_NOT_FOUND); 676 *h_errnop = statp->res_h_errno; 677 return (NS_NOTFOUND); 678 } 679 statp->options = old_options; 680 for (haddr = rhe->h_addr_list; *haddr; haddr++) 681 if (!memcmp(*haddr, addr, NS_INADDRSZ)) 682 break; 683 if (!*haddr) { 684 if (inet_ntop(af, addr, numaddr, sizeof(numaddr)) == NULL) 685 strlcpy(numaddr, "UNKNOWN", sizeof(numaddr)); 686 syslog(LOG_NOTICE|LOG_AUTH, 687 "gethostbyaddr: A record of %s != PTR record [%s]", 688 hname2, numaddr); 689 RES_SET_H_ERRNO(statp, HOST_NOT_FOUND); 690 *h_errnop = statp->res_h_errno; 691 return (NS_NOTFOUND); 692 } 693 } 694#endif /*SUNSECURITY*/ 695 he.h_addrtype = af; 696 he.h_length = len; 697 memcpy(hed->host_addr, uaddr, len); 698 hed->h_addr_ptrs[0] = (char *)hed->host_addr; 699 hed->h_addr_ptrs[1] = NULL; 700 if (af == AF_INET && (statp->options & RES_USE_INET6)) { 701 _map_v4v6_address((char*)hed->host_addr, (char*)hed->host_addr); 702 he.h_addrtype = AF_INET6; 703 he.h_length = NS_IN6ADDRSZ; 704 } 705 if (__copy_hostent(&he, hptr, buffer, buflen) != 0) { 706 *errnop = errno; 707 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 708 *h_errnop = statp->res_h_errno; 709 return (NS_RETURN); 710 } 711 RES_SET_H_ERRNO(statp, NETDB_SUCCESS); 712 *((struct hostent **)rval) = hptr; 713 return (NS_SUCCESS); 714} 715 716#ifdef RESOLVSORT 717static void 718addrsort(char **ap, int num, res_state res) 719{ 720 int i, j; 721 char **p; 722 short aval[_MAXADDRS]; 723 int needsort = 0; 724 725 p = ap; 726 for (i = 0; i < num; i++, p++) { 727 for (j = 0 ; (unsigned)j < res->nsort; j++) 728 if (res->sort_list[j].addr.s_addr == 729 (((struct in_addr *)(*p))->s_addr & res->sort_list[j].mask)) 730 break; 731 aval[i] = j; 732 if (needsort == 0 && i > 0 && j < aval[i-1]) 733 needsort = i; 734 } 735 if (!needsort) 736 return; 737 738 while (needsort < num) { 739 for (j = needsort - 1; j >= 0; j--) { 740 if (aval[j] > aval[j+1]) { 741 char *hp; 742 743 i = aval[j]; 744 aval[j] = aval[j+1]; 745 aval[j+1] = i; 746 747 hp = ap[j]; 748 ap[j] = ap[j+1]; 749 ap[j+1] = hp; 750 751 } else 752 break; 753 } 754 needsort++; 755 } 756} 757#endif 758 759void 760_sethostdnsent(int stayopen) 761{ 762 res_state statp; 763 764 statp = __res_state(); 765 if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1) 766 return; 767 if (stayopen) 768 statp->options |= RES_STAYOPEN | RES_USEVC; 769} 770 771void 772_endhostdnsent() 773{ 774 res_state statp; 775 776 statp = __res_state(); 777 statp->options &= ~(RES_STAYOPEN | RES_USEVC); 778 res_nclose(statp); 779} 780