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 static const char AskedForGot[] = 78 "gethostby*.gethostanswer: asked for \"%s\", got \"%s\""; 79 80 #ifdef RESOLVSORT 81 static void addrsort(char **, int, res_state); 82 #endif 83 84 #ifdef DEBUG 85 static void dbg_printf(char *, int, res_state) __printflike(1, 0); 86 #endif 87 88 #define MAXPACKET (64*1024) 89 90 typedef union { 91 HEADER hdr; 92 u_char buf[MAXPACKET]; 93 } querybuf; 94 95 typedef union { 96 int32_t al; 97 char ac; 98 } align; 99 100 int _dns_ttl_; 101 102 #ifdef DEBUG 103 static void 104 dbg_printf(char *msg, int num, res_state res) 105 { 106 if (res->options & RES_DEBUG) { 107 int save = errno; 108 109 printf(msg, num); 110 errno = save; 111 } 112 } 113 #else 114 # define dbg_printf(msg, num, res) /*nada*/ 115 #endif 116 117 #define BOUNDED_INCR(x) \ 118 do { \ 119 cp += x; \ 120 if (cp > eom) { \ 121 RES_SET_H_ERRNO(statp, NO_RECOVERY); \ 122 return (-1); \ 123 } \ 124 } while (0) 125 126 #define BOUNDS_CHECK(ptr, count) \ 127 do { \ 128 if ((ptr) + (count) > eom) { \ 129 RES_SET_H_ERRNO(statp, NO_RECOVERY); \ 130 return (-1); \ 131 } \ 132 } while (0) 133 134 static int 135 gethostanswer(const querybuf *answer, int anslen, const char *qname, int qtype, 136 struct hostent *he, struct hostent_data *hed, res_state statp) 137 { 138 const HEADER *hp; 139 const u_char *cp; 140 int n; 141 const u_char *eom, *erdata; 142 char *bp, *ep, **ap, **hap; 143 int type, class, ancount, qdcount; 144 int haveanswer, had_error; 145 int toobig = 0; 146 char tbuf[MAXDNAME]; 147 const char *tname; 148 int (*name_ok)(const char *); 149 150 tname = qname; 151 he->h_name = NULL; 152 eom = answer->buf + anslen; 153 switch (qtype) { 154 case T_A: 155 case T_AAAA: 156 name_ok = res_hnok; 157 break; 158 case T_PTR: 159 name_ok = res_dnok; 160 break; 161 default: 162 RES_SET_H_ERRNO(statp, NO_RECOVERY); 163 return (-1); /* XXX should be abort(); */ 164 } 165 /* 166 * find first satisfactory answer 167 */ 168 hp = &answer->hdr; 169 ancount = ntohs(hp->ancount); 170 qdcount = ntohs(hp->qdcount); 171 bp = hed->hostbuf; 172 ep = hed->hostbuf + sizeof hed->hostbuf; 173 cp = answer->buf; 174 BOUNDED_INCR(HFIXEDSZ); 175 if (qdcount != 1) { 176 RES_SET_H_ERRNO(statp, NO_RECOVERY); 177 return (-1); 178 } 179 n = dn_expand(answer->buf, eom, cp, bp, ep - bp); 180 if ((n < 0) || !(*name_ok)(bp)) { 181 RES_SET_H_ERRNO(statp, NO_RECOVERY); 182 return (-1); 183 } 184 BOUNDED_INCR(n + QFIXEDSZ); 185 if (qtype == T_A || qtype == T_AAAA) { 186 /* res_send() has already verified that the query name is the 187 * same as the one we sent; this just gets the expanded name 188 * (i.e., with the succeeding search-domain tacked on). 189 */ 190 n = strlen(bp) + 1; /* for the \0 */ 191 if (n >= MAXHOSTNAMELEN) { 192 RES_SET_H_ERRNO(statp, NO_RECOVERY); 193 return (-1); 194 } 195 he->h_name = bp; 196 bp += n; 197 /* The qname can be abbreviated, but h_name is now absolute. */ 198 qname = he->h_name; 199 } 200 ap = hed->host_aliases; 201 *ap = NULL; 202 he->h_aliases = hed->host_aliases; 203 hap = hed->h_addr_ptrs; 204 *hap = NULL; 205 he->h_addr_list = hed->h_addr_ptrs; 206 haveanswer = 0; 207 had_error = 0; 208 _dns_ttl_ = -1; 209 while (ancount-- > 0 && cp < eom && !had_error) { 210 n = dn_expand(answer->buf, eom, cp, bp, ep - bp); 211 if ((n < 0) || !(*name_ok)(bp)) { 212 had_error++; 213 continue; 214 } 215 cp += n; /* name */ 216 BOUNDS_CHECK(cp, 3 * INT16SZ + INT32SZ); 217 type = _getshort(cp); 218 cp += INT16SZ; /* type */ 219 class = _getshort(cp); 220 cp += INT16SZ; /* class */ 221 if (qtype == T_A && type == T_A) 222 _dns_ttl_ = _getlong(cp); 223 cp += INT32SZ; /* TTL */ 224 n = _getshort(cp); 225 cp += INT16SZ; /* len */ 226 BOUNDS_CHECK(cp, n); 227 erdata = cp + n; 228 if (class != C_IN) { 229 /* XXX - debug? syslog? */ 230 cp += n; 231 continue; /* XXX - had_error++ ? */ 232 } 233 if ((qtype == T_A || qtype == T_AAAA) && type == T_CNAME) { 234 if (ap >= &hed->host_aliases[_MAXALIASES-1]) 235 continue; 236 n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf); 237 if ((n < 0) || !(*name_ok)(tbuf)) { 238 had_error++; 239 continue; 240 } 241 cp += n; 242 if (cp != erdata) { 243 RES_SET_H_ERRNO(statp, NO_RECOVERY); 244 return (-1); 245 } 246 /* Store alias. */ 247 *ap++ = bp; 248 n = strlen(bp) + 1; /* for the \0 */ 249 if (n >= MAXHOSTNAMELEN) { 250 had_error++; 251 continue; 252 } 253 bp += n; 254 /* Get canonical name. */ 255 n = strlen(tbuf) + 1; /* for the \0 */ 256 if (n > ep - bp || n >= MAXHOSTNAMELEN) { 257 had_error++; 258 continue; 259 } 260 strcpy(bp, tbuf); 261 he->h_name = bp; 262 bp += n; 263 continue; 264 } 265 if (qtype == T_PTR && type == T_CNAME) { 266 n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf); 267 if (n < 0 || !res_dnok(tbuf)) { 268 had_error++; 269 continue; 270 } 271 cp += n; 272 if (cp != erdata) { 273 RES_SET_H_ERRNO(statp, NO_RECOVERY); 274 return (-1); 275 } 276 /* Get canonical name. */ 277 n = strlen(tbuf) + 1; /* for the \0 */ 278 if (n > ep - bp || n >= MAXHOSTNAMELEN) { 279 had_error++; 280 continue; 281 } 282 strcpy(bp, tbuf); 283 tname = bp; 284 bp += n; 285 continue; 286 } 287 if (type != qtype) { 288 #ifdef DEBUG 289 if (type != T_KEY && type != T_SIG && 290 type != T_DNAME && type != T_RRSIG) 291 syslog(LOG_NOTICE|LOG_AUTH, 292 "gethostby*.gethostanswer: asked for \"%s %s %s\", got type \"%s\"", 293 qname, p_class(C_IN), p_type(qtype), 294 p_type(type)); 295 #endif 296 cp += n; 297 continue; /* XXX - had_error++ ? */ 298 } 299 switch (type) { 300 case T_PTR: 301 if (strcasecmp(tname, bp) != 0) { 302 syslog(LOG_NOTICE|LOG_AUTH, 303 AskedForGot, qname, bp); 304 cp += n; 305 continue; /* XXX - had_error++ ? */ 306 } 307 n = dn_expand(answer->buf, eom, cp, bp, ep - bp); 308 if ((n < 0) || !res_hnok(bp)) { 309 had_error++; 310 break; 311 } 312 #if MULTI_PTRS_ARE_ALIASES 313 cp += n; 314 if (cp != erdata) { 315 RES_SET_H_ERRNO(statp, NO_RECOVERY); 316 return (-1); 317 } 318 if (!haveanswer) 319 he->h_name = bp; 320 else if (ap < &hed->host_aliases[_MAXALIASES-1]) 321 *ap++ = bp; 322 else 323 n = -1; 324 if (n != -1) { 325 n = strlen(bp) + 1; /* for the \0 */ 326 if (n >= MAXHOSTNAMELEN) { 327 had_error++; 328 break; 329 } 330 bp += n; 331 } 332 break; 333 #else 334 he->h_name = bp; 335 if (statp->options & RES_USE_INET6) { 336 n = strlen(bp) + 1; /* for the \0 */ 337 if (n >= MAXHOSTNAMELEN) { 338 had_error++; 339 break; 340 } 341 bp += n; 342 _map_v4v6_hostent(he, &bp, ep); 343 } 344 RES_SET_H_ERRNO(statp, NETDB_SUCCESS); 345 return (0); 346 #endif 347 case T_A: 348 case T_AAAA: 349 if (strcasecmp(he->h_name, bp) != 0) { 350 syslog(LOG_NOTICE|LOG_AUTH, 351 AskedForGot, he->h_name, bp); 352 cp += n; 353 continue; /* XXX - had_error++ ? */ 354 } 355 if (n != he->h_length) { 356 cp += n; 357 continue; 358 } 359 if (!haveanswer) { 360 int nn; 361 362 he->h_name = bp; 363 nn = strlen(bp) + 1; /* for the \0 */ 364 bp += nn; 365 } 366 367 bp += sizeof(align) - ((u_long)bp % sizeof(align)); 368 369 if (bp + n >= ep) { 370 dbg_printf("size (%d) too big\n", n, statp); 371 had_error++; 372 continue; 373 } 374 if (hap >= &hed->h_addr_ptrs[_MAXADDRS-1]) { 375 if (!toobig++) 376 dbg_printf("Too many addresses (%d)\n", 377 _MAXADDRS, statp); 378 cp += n; 379 continue; 380 } 381 memcpy(*hap++ = bp, cp, n); 382 bp += n; 383 cp += n; 384 if (cp != erdata) { 385 RES_SET_H_ERRNO(statp, NO_RECOVERY); 386 return (-1); 387 } 388 break; 389 default: 390 dbg_printf("Impossible condition (type=%d)\n", type, 391 statp); 392 RES_SET_H_ERRNO(statp, NO_RECOVERY); 393 return (-1); 394 /* BIND has abort() here, too risky on bad data */ 395 } 396 if (!had_error) 397 haveanswer++; 398 } 399 if (haveanswer) { 400 *ap = NULL; 401 *hap = NULL; 402 # if defined(RESOLVSORT) 403 /* 404 * Note: we sort even if host can take only one address 405 * in its return structures - should give it the "best" 406 * address in that case, not some random one 407 */ 408 if (statp->nsort && haveanswer > 1 && qtype == T_A) 409 addrsort(hed->h_addr_ptrs, haveanswer, statp); 410 # endif /*RESOLVSORT*/ 411 if (!he->h_name) { 412 n = strlen(qname) + 1; /* for the \0 */ 413 if (n > ep - bp || n >= MAXHOSTNAMELEN) 414 goto no_recovery; 415 strcpy(bp, qname); 416 he->h_name = bp; 417 bp += n; 418 } 419 if (statp->options & RES_USE_INET6) 420 _map_v4v6_hostent(he, &bp, ep); 421 RES_SET_H_ERRNO(statp, NETDB_SUCCESS); 422 return (0); 423 } 424 no_recovery: 425 RES_SET_H_ERRNO(statp, NO_RECOVERY); 426 return (-1); 427 } 428 429 /* XXX: for async DNS resolver in ypserv */ 430 struct hostent * 431 __dns_getanswer(const char *answer, int anslen, const char *qname, int qtype) 432 { 433 struct hostent *he; 434 struct hostent_data *hed; 435 int error; 436 res_state statp; 437 438 statp = __res_state(); 439 if ((he = __hostent_init()) == NULL || 440 (hed = __hostent_data_init()) == NULL) { 441 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 442 return (NULL); 443 } 444 switch (qtype) { 445 case T_AAAA: 446 he->h_addrtype = AF_INET6; 447 he->h_length = NS_IN6ADDRSZ; 448 break; 449 case T_A: 450 default: 451 he->h_addrtype = AF_INET; 452 he->h_length = NS_INADDRSZ; 453 break; 454 } 455 456 error = gethostanswer((const querybuf *)answer, anslen, qname, qtype, 457 he, hed, statp); 458 return (error == 0) ? he : NULL; 459 } 460 461 int 462 _dns_gethostbyname(void *rval, void *cb_data, va_list ap) 463 { 464 const char *name; 465 int af; 466 char *buffer; 467 size_t buflen; 468 int *errnop, *h_errnop; 469 struct hostent *hptr, he; 470 struct hostent_data *hed; 471 querybuf *buf; 472 int n, type, error; 473 res_state statp; 474 475 name = va_arg(ap, const char *); 476 af = va_arg(ap, int); 477 hptr = va_arg(ap, struct hostent *); 478 buffer = va_arg(ap, char *); 479 buflen = va_arg(ap, size_t); 480 errnop = va_arg(ap, int *); 481 h_errnop = va_arg(ap, int *); 482 483 *((struct hostent **)rval) = NULL; 484 485 statp = __res_state(); 486 if ((hed = __hostent_data_init()) == NULL) { 487 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 488 *h_errnop = statp->res_h_errno; 489 return (NS_NOTFOUND); 490 } 491 492 he.h_addrtype = af; 493 switch (af) { 494 case AF_INET: 495 he.h_length = NS_INADDRSZ; 496 type = T_A; 497 break; 498 case AF_INET6: 499 he.h_length = NS_IN6ADDRSZ; 500 type = T_AAAA; 501 break; 502 default: 503 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 504 *h_errnop = statp->res_h_errno; 505 errno = EAFNOSUPPORT; 506 return (NS_UNAVAIL); 507 } 508 509 if ((buf = malloc(sizeof(*buf))) == NULL) { 510 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 511 *h_errnop = statp->res_h_errno; 512 return (NS_NOTFOUND); 513 } 514 n = res_nsearch(statp, name, C_IN, type, buf->buf, sizeof(buf->buf)); 515 if (n < 0) { 516 free(buf); 517 dbg_printf("res_nsearch failed (%d)\n", n, statp); 518 *h_errnop = statp->res_h_errno; 519 return (NS_NOTFOUND); 520 } else if (n > sizeof(buf->buf)) { 521 free(buf); 522 dbg_printf("static buffer is too small (%d)\n", n, statp); 523 *h_errnop = statp->res_h_errno; 524 return (NS_UNAVAIL); 525 } 526 error = gethostanswer(buf, n, name, type, &he, hed, statp); 527 free(buf); 528 if (error != 0) { 529 *h_errnop = statp->res_h_errno; 530 switch (statp->res_h_errno) { 531 case HOST_NOT_FOUND: 532 return (NS_NOTFOUND); 533 case TRY_AGAIN: 534 return (NS_TRYAGAIN); 535 default: 536 return (NS_UNAVAIL); 537 } 538 /*NOTREACHED*/ 539 } 540 if (__copy_hostent(&he, hptr, buffer, buflen) != 0) { 541 *errnop = errno; 542 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 543 *h_errnop = statp->res_h_errno; 544 return (NS_RETURN); 545 } 546 RES_SET_H_ERRNO(statp, NETDB_SUCCESS); 547 *((struct hostent **)rval) = hptr; 548 return (NS_SUCCESS); 549 } 550 551 int 552 _dns_gethostbyaddr(void *rval, void *cb_data, va_list ap) 553 { 554 const void *addr; 555 socklen_t len; 556 int af; 557 char *buffer; 558 size_t buflen; 559 int *errnop, *h_errnop; 560 const u_char *uaddr; 561 struct hostent *hptr, he; 562 struct hostent_data *hed; 563 int n; 564 querybuf *buf; 565 char qbuf[MAXDNAME+1], *qp; 566 res_state statp; 567 #ifdef SUNSECURITY 568 struct hostdata rhd; 569 struct hostent *rhe; 570 char **haddr; 571 u_long old_options; 572 char hname2[MAXDNAME+1], numaddr[46]; 573 int ret_h_error; 574 #endif /*SUNSECURITY*/ 575 576 addr = va_arg(ap, const void *); 577 len = va_arg(ap, socklen_t); 578 af = va_arg(ap, int); 579 hptr = va_arg(ap, struct hostent *); 580 buffer = va_arg(ap, char *); 581 buflen = va_arg(ap, size_t); 582 errnop = va_arg(ap, int *); 583 h_errnop = va_arg(ap, int *); 584 uaddr = (const u_char *)addr; 585 586 *((struct hostent **)rval) = NULL; 587 588 statp = __res_state(); 589 if ((hed = __hostent_data_init()) == NULL) { 590 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 591 *h_errnop = statp->res_h_errno; 592 return (NS_NOTFOUND); 593 } 594 595 switch (af) { 596 case AF_INET: 597 (void) sprintf(qbuf, "%u.%u.%u.%u.in-addr.arpa", 598 (uaddr[3] & 0xff), 599 (uaddr[2] & 0xff), 600 (uaddr[1] & 0xff), 601 (uaddr[0] & 0xff)); 602 break; 603 case AF_INET6: 604 qp = qbuf; 605 for (n = NS_IN6ADDRSZ - 1; n >= 0; n--) { 606 qp += SPRINTF((qp, "%x.%x.", 607 uaddr[n] & 0xf, 608 (uaddr[n] >> 4) & 0xf)); 609 } 610 strlcat(qbuf, "ip6.arpa", sizeof(qbuf)); 611 break; 612 default: 613 abort(); 614 } 615 if ((buf = malloc(sizeof(*buf))) == NULL) { 616 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 617 *h_errnop = statp->res_h_errno; 618 return NS_NOTFOUND; 619 } 620 n = res_nquery(statp, qbuf, C_IN, T_PTR, (u_char *)buf->buf, 621 sizeof buf->buf); 622 if (n < 0) { 623 free(buf); 624 dbg_printf("res_nquery failed (%d)\n", n, statp); 625 *h_errnop = statp->res_h_errno; 626 return (NS_UNAVAIL); 627 } 628 if (n > sizeof buf->buf) { 629 free(buf); 630 dbg_printf("static buffer is too small (%d)\n", n, statp); 631 *h_errnop = statp->res_h_errno; 632 return (NS_UNAVAIL); 633 } 634 if (gethostanswer(buf, n, qbuf, T_PTR, &he, hed, statp) != 0) { 635 free(buf); 636 *h_errnop = statp->res_h_errno; 637 switch (statp->res_h_errno) { 638 case HOST_NOT_FOUND: 639 return (NS_NOTFOUND); 640 case TRY_AGAIN: 641 return (NS_TRYAGAIN); 642 default: 643 return (NS_UNAVAIL); 644 } 645 /*NOTREACHED*/ 646 } 647 free(buf); 648 #ifdef SUNSECURITY 649 if (af == AF_INET) { 650 /* 651 * turn off search as the name should be absolute, 652 * 'localhost' should be matched by defnames 653 */ 654 strncpy(hname2, he.h_name, MAXDNAME); 655 hname2[MAXDNAME] = '\0'; 656 old_options = statp->options; 657 statp->options &= ~RES_DNSRCH; 658 statp->options |= RES_DEFNAMES; 659 memset(&rhd, 0, sizeof rhd); 660 rhe = gethostbyname_r(hname2, &rhd.host, &rhd.data, 661 sizeof(rhd.data), &ret_h_error); 662 if (rhe == NULL) { 663 if (inet_ntop(af, addr, numaddr, sizeof(numaddr)) == NULL) 664 strlcpy(numaddr, "UNKNOWN", sizeof(numaddr)); 665 syslog(LOG_NOTICE|LOG_AUTH, 666 "gethostbyaddr: No A record for %s (verifying [%s])", 667 hname2, numaddr); 668 statp->options = old_options; 669 RES_SET_H_ERRNO(statp, HOST_NOT_FOUND); 670 *h_errnop = statp->res_h_errno; 671 return (NS_NOTFOUND); 672 } 673 statp->options = old_options; 674 for (haddr = rhe->h_addr_list; *haddr; haddr++) 675 if (!memcmp(*haddr, addr, NS_INADDRSZ)) 676 break; 677 if (!*haddr) { 678 if (inet_ntop(af, addr, numaddr, sizeof(numaddr)) == NULL) 679 strlcpy(numaddr, "UNKNOWN", sizeof(numaddr)); 680 syslog(LOG_NOTICE|LOG_AUTH, 681 "gethostbyaddr: A record of %s != PTR record [%s]", 682 hname2, numaddr); 683 RES_SET_H_ERRNO(statp, HOST_NOT_FOUND); 684 *h_errnop = statp->res_h_errno; 685 return (NS_NOTFOUND); 686 } 687 } 688 #endif /*SUNSECURITY*/ 689 he.h_addrtype = af; 690 he.h_length = len; 691 memcpy(hed->host_addr, uaddr, len); 692 hed->h_addr_ptrs[0] = (char *)hed->host_addr; 693 hed->h_addr_ptrs[1] = NULL; 694 if (af == AF_INET && (statp->options & RES_USE_INET6)) { 695 _map_v4v6_address((char*)hed->host_addr, (char*)hed->host_addr); 696 he.h_addrtype = AF_INET6; 697 he.h_length = NS_IN6ADDRSZ; 698 } 699 if (__copy_hostent(&he, hptr, buffer, buflen) != 0) { 700 *errnop = errno; 701 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 702 *h_errnop = statp->res_h_errno; 703 return (NS_RETURN); 704 } 705 RES_SET_H_ERRNO(statp, NETDB_SUCCESS); 706 *((struct hostent **)rval) = hptr; 707 return (NS_SUCCESS); 708 } 709 710 #ifdef RESOLVSORT 711 static void 712 addrsort(char **ap, int num, res_state res) 713 { 714 int i, j; 715 char **p; 716 short aval[_MAXADDRS]; 717 int needsort = 0; 718 719 p = ap; 720 for (i = 0; i < num; i++, p++) { 721 for (j = 0 ; (unsigned)j < res->nsort; j++) 722 if (res->sort_list[j].addr.s_addr == 723 (((struct in_addr *)(*p))->s_addr & res->sort_list[j].mask)) 724 break; 725 aval[i] = j; 726 if (needsort == 0 && i > 0 && j < aval[i-1]) 727 needsort = i; 728 } 729 if (!needsort) 730 return; 731 732 while (needsort < num) { 733 for (j = needsort - 1; j >= 0; j--) { 734 if (aval[j] > aval[j+1]) { 735 char *hp; 736 737 i = aval[j]; 738 aval[j] = aval[j+1]; 739 aval[j+1] = i; 740 741 hp = ap[j]; 742 ap[j] = ap[j+1]; 743 ap[j+1] = hp; 744 745 } else 746 break; 747 } 748 needsort++; 749 } 750 } 751 #endif 752 753 void 754 _sethostdnsent(int stayopen) 755 { 756 res_state statp; 757 758 statp = __res_state(); 759 if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1) 760 return; 761 if (stayopen) 762 statp->options |= RES_STAYOPEN | RES_USEVC; 763 } 764 765 void 766 _endhostdnsent(void) 767 { 768 res_state statp; 769 770 statp = __res_state(); 771 statp->options &= ~(RES_STAYOPEN | RES_USEVC); 772 res_nclose(statp); 773 } 774