1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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/param.h> 55 #include <sys/socket.h> 56 #include <netinet/in.h> 57 #include <arpa/inet.h> 58 #include <arpa/nameser.h> 59 60 #include <stdio.h> 61 #include <stdlib.h> 62 #include <unistd.h> 63 #include <string.h> 64 #include <netdb.h> 65 #include <resolv.h> 66 #include <ctype.h> 67 #include <errno.h> 68 #include <syslog.h> 69 #include <stdarg.h> 70 #include <nsswitch.h> 71 72 #include "netdb_private.h" 73 #include "res_config.h" 74 75 #define SPRINTF(x) ((size_t)sprintf x) 76 77 #ifdef DEBUG 78 static const char AskedForGot[] = 79 "gethostby*.gethostanswer: asked for \"%s\", got \"%s\""; 80 #endif 81 82 #ifdef RESOLVSORT 83 static void addrsort(char **, int, res_state); 84 #endif 85 86 #ifdef DEBUG 87 static void dbg_printf(char *, int, res_state) __printflike(1, 0); 88 #endif 89 90 #define MAXPACKET (64*1024) 91 92 typedef union { 93 HEADER hdr; 94 u_char buf[MAXPACKET]; 95 } querybuf; 96 97 typedef union { 98 int32_t al; 99 char ac; 100 } align; 101 102 int _dns_ttl_; 103 104 #ifdef DEBUG 105 static void 106 dbg_printf(char *msg, int num, res_state res) 107 { 108 if (res->options & RES_DEBUG) { 109 int save = errno; 110 111 printf(msg, num); 112 errno = save; 113 } 114 } 115 #else 116 # define dbg_printf(msg, num, res) /*nada*/ 117 #endif 118 119 #define BOUNDED_INCR(x) \ 120 do { \ 121 cp += x; \ 122 if (cp > eom) { \ 123 RES_SET_H_ERRNO(statp, NO_RECOVERY); \ 124 return (-1); \ 125 } \ 126 } while (0) 127 128 #define BOUNDS_CHECK(ptr, count) \ 129 do { \ 130 if ((ptr) + (count) > eom) { \ 131 RES_SET_H_ERRNO(statp, NO_RECOVERY); \ 132 return (-1); \ 133 } \ 134 } while (0) 135 136 static int 137 gethostanswer(const querybuf *answer, int anslen, const char *qname, int qtype, 138 struct hostent *he, struct hostent_data *hed, res_state statp) 139 { 140 const HEADER *hp; 141 const u_char *cp; 142 int n; 143 const u_char *eom, *erdata; 144 char *bp, *ep, **ap, **hap; 145 int type, class, ancount, qdcount; 146 int haveanswer, had_error; 147 int toobig = 0; 148 char tbuf[MAXDNAME]; 149 const char *tname; 150 int (*name_ok)(const char *); 151 152 tname = qname; 153 he->h_name = NULL; 154 eom = answer->buf + anslen; 155 switch (qtype) { 156 case T_A: 157 case T_AAAA: 158 name_ok = res_hnok; 159 break; 160 case T_PTR: 161 name_ok = res_dnok; 162 break; 163 default: 164 RES_SET_H_ERRNO(statp, NO_RECOVERY); 165 return (-1); /* XXX should be abort(); */ 166 } 167 /* 168 * find first satisfactory answer 169 */ 170 hp = &answer->hdr; 171 ancount = ntohs(hp->ancount); 172 qdcount = ntohs(hp->qdcount); 173 bp = hed->hostbuf; 174 ep = hed->hostbuf + sizeof hed->hostbuf; 175 cp = answer->buf; 176 BOUNDED_INCR(HFIXEDSZ); 177 if (qdcount != 1) { 178 RES_SET_H_ERRNO(statp, NO_RECOVERY); 179 return (-1); 180 } 181 n = dn_expand(answer->buf, eom, cp, bp, ep - bp); 182 if ((n < 0) || !(*name_ok)(bp)) { 183 RES_SET_H_ERRNO(statp, NO_RECOVERY); 184 return (-1); 185 } 186 BOUNDED_INCR(n + QFIXEDSZ); 187 if (qtype == T_A || qtype == T_AAAA) { 188 /* res_send() has already verified that the query name is the 189 * same as the one we sent; this just gets the expanded name 190 * (i.e., with the succeeding search-domain tacked on). 191 */ 192 n = strlen(bp) + 1; /* for the \0 */ 193 if (n >= MAXHOSTNAMELEN) { 194 RES_SET_H_ERRNO(statp, NO_RECOVERY); 195 return (-1); 196 } 197 he->h_name = bp; 198 bp += n; 199 /* The qname can be abbreviated, but h_name is now absolute. */ 200 qname = he->h_name; 201 } 202 ap = hed->host_aliases; 203 *ap = NULL; 204 he->h_aliases = hed->host_aliases; 205 hap = hed->h_addr_ptrs; 206 *hap = NULL; 207 he->h_addr_list = hed->h_addr_ptrs; 208 haveanswer = 0; 209 had_error = 0; 210 _dns_ttl_ = -1; 211 while (ancount-- > 0 && cp < eom && !had_error) { 212 n = dn_expand(answer->buf, eom, cp, bp, ep - bp); 213 if ((n < 0) || !(*name_ok)(bp)) { 214 had_error++; 215 continue; 216 } 217 cp += n; /* name */ 218 BOUNDS_CHECK(cp, 3 * INT16SZ + INT32SZ); 219 type = _getshort(cp); 220 cp += INT16SZ; /* type */ 221 class = _getshort(cp); 222 cp += INT16SZ; /* class */ 223 if (qtype == T_A && type == T_A) 224 _dns_ttl_ = _getlong(cp); 225 cp += INT32SZ; /* TTL */ 226 n = _getshort(cp); 227 cp += INT16SZ; /* len */ 228 BOUNDS_CHECK(cp, n); 229 erdata = cp + n; 230 if (class != C_IN) { 231 /* XXX - debug? syslog? */ 232 cp += n; 233 continue; /* XXX - had_error++ ? */ 234 } 235 if ((qtype == T_A || qtype == T_AAAA) && type == T_CNAME) { 236 if (ap >= &hed->host_aliases[_MAXALIASES-1]) 237 continue; 238 n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf); 239 if ((n < 0) || !(*name_ok)(tbuf)) { 240 had_error++; 241 continue; 242 } 243 cp += n; 244 if (cp != erdata) { 245 RES_SET_H_ERRNO(statp, NO_RECOVERY); 246 return (-1); 247 } 248 /* Store alias. */ 249 *ap++ = bp; 250 n = strlen(bp) + 1; /* for the \0 */ 251 if (n >= MAXHOSTNAMELEN) { 252 had_error++; 253 continue; 254 } 255 bp += n; 256 /* Get canonical name. */ 257 n = strlen(tbuf) + 1; /* for the \0 */ 258 if (n > ep - bp || n >= MAXHOSTNAMELEN) { 259 had_error++; 260 continue; 261 } 262 strcpy(bp, tbuf); 263 he->h_name = bp; 264 bp += n; 265 continue; 266 } 267 if (qtype == T_PTR && type == T_CNAME) { 268 n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf); 269 if (n < 0 || !res_dnok(tbuf)) { 270 had_error++; 271 continue; 272 } 273 cp += n; 274 if (cp != erdata) { 275 RES_SET_H_ERRNO(statp, NO_RECOVERY); 276 return (-1); 277 } 278 /* Get canonical name. */ 279 n = strlen(tbuf) + 1; /* for the \0 */ 280 if (n > ep - bp || n >= MAXHOSTNAMELEN) { 281 had_error++; 282 continue; 283 } 284 strcpy(bp, tbuf); 285 tname = bp; 286 bp += n; 287 continue; 288 } 289 if (type != qtype) { 290 #ifdef DEBUG 291 if (type != T_KEY && type != T_SIG && 292 type != T_DNAME && type != T_RRSIG) 293 syslog(LOG_NOTICE|LOG_AUTH, 294 "gethostby*.gethostanswer: asked for \"%s %s %s\", got type \"%s\"", 295 qname, p_class(C_IN), p_type(qtype), 296 p_type(type)); 297 #endif 298 cp += n; 299 continue; /* XXX - had_error++ ? */ 300 } 301 switch (type) { 302 case T_PTR: 303 if (strcasecmp(tname, bp) != 0) { 304 #ifdef DEBUG 305 syslog(LOG_NOTICE|LOG_AUTH, 306 AskedForGot, qname, bp); 307 #endif 308 cp += n; 309 continue; /* XXX - had_error++ ? */ 310 } 311 n = dn_expand(answer->buf, eom, cp, bp, ep - bp); 312 if ((n < 0) || !res_hnok(bp)) { 313 had_error++; 314 break; 315 } 316 #if MULTI_PTRS_ARE_ALIASES 317 cp += n; 318 if (cp != erdata) { 319 RES_SET_H_ERRNO(statp, NO_RECOVERY); 320 return (-1); 321 } 322 if (!haveanswer) 323 he->h_name = bp; 324 else if (ap < &hed->host_aliases[_MAXALIASES-1]) 325 *ap++ = bp; 326 else 327 n = -1; 328 if (n != -1) { 329 n = strlen(bp) + 1; /* for the \0 */ 330 if (n >= MAXHOSTNAMELEN) { 331 had_error++; 332 break; 333 } 334 bp += n; 335 } 336 break; 337 #else 338 he->h_name = bp; 339 if (statp->options & RES_USE_INET6) { 340 n = strlen(bp) + 1; /* for the \0 */ 341 if (n >= MAXHOSTNAMELEN) { 342 had_error++; 343 break; 344 } 345 bp += n; 346 _map_v4v6_hostent(he, &bp, ep); 347 } 348 RES_SET_H_ERRNO(statp, NETDB_SUCCESS); 349 return (0); 350 #endif 351 case T_A: 352 case T_AAAA: 353 if (strcasecmp(he->h_name, bp) != 0) { 354 #ifdef DEBUG 355 syslog(LOG_NOTICE|LOG_AUTH, 356 AskedForGot, he->h_name, bp); 357 #endif 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 dbg_printf("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 dbg_printf("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 dbg_printf("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 */ 436 struct 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 } 466 467 int 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 dbg_printf("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 dbg_printf("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 } 556 557 int 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 dbg_printf("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 dbg_printf("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 717 static void 718 addrsort(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 758 759 void 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 } 770 771 void 772 _endhostdnsent(void) 773 { 774 res_state statp; 775 776 statp = __res_state(); 777 statp->options &= ~(RES_STAYOPEN | RES_USEVC); 778 res_nclose(statp); 779 } 780