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 * 3. 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 * @(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93 52 * From: Id: gethnamaddr.c,v 8.23 1998/04/07 04:59:46 vixie Exp $ 53 * $FreeBSD: src/lib/libc/net/gethostbydns.c,v 1.58 2007/01/09 00:28:02 imp Exp $ 54 */ 55 56 #include <sys/types.h> 57 #include <sys/param.h> 58 #include <sys/socket.h> 59 #include <netinet/in.h> 60 #include <arpa/inet.h> 61 #include <arpa/nameser.h> 62 63 #include <stdio.h> 64 #include <stdlib.h> 65 #include <unistd.h> 66 #include <string.h> 67 #include <netdb.h> 68 #include <resolv.h> 69 #include <ctype.h> 70 #include <errno.h> 71 #include <syslog.h> 72 #include <stdarg.h> 73 #include <nsswitch.h> 74 75 #include "netdb_private.h" 76 #include "res_config.h" 77 78 #define SPRINTF(x) ((size_t)sprintf x) 79 80 static const char AskedForGot[] = 81 "gethostby*.gethostanswer: asked for \"%s\", got \"%s\""; 82 83 #ifdef RESOLVSORT 84 static void addrsort(char **, int, res_state); 85 #endif 86 87 #ifdef DEBUG 88 static void dbg_printf(char *, int, res_state) __printflike(1, 0); 89 #endif 90 91 #define MAXPACKET (64*1024) 92 93 typedef union { 94 HEADER hdr; 95 u_char buf[MAXPACKET]; 96 } querybuf; 97 98 typedef union { 99 int32_t al; 100 char ac; 101 } align; 102 103 int _dns_ttl_; 104 105 #ifdef DEBUG 106 static void 107 dbg_printf(char *msg, int num, res_state res) 108 { 109 if (res->options & RES_DEBUG) { 110 int save = errno; 111 112 printf(msg, num); 113 errno = save; 114 } 115 } 116 #else 117 # define dbg_printf(msg, num, res) /*nada*/ 118 #endif 119 120 #define BOUNDED_INCR(x) \ 121 do { \ 122 cp += x; \ 123 if (cp > eom) { \ 124 RES_SET_H_ERRNO(statp, NO_RECOVERY); \ 125 return (-1); \ 126 } \ 127 } while (0) 128 129 #define BOUNDS_CHECK(ptr, count) \ 130 do { \ 131 if ((ptr) + (count) > eom) { \ 132 RES_SET_H_ERRNO(statp, NO_RECOVERY); \ 133 return (-1); \ 134 } \ 135 } while (0) 136 137 static int 138 gethostanswer(const querybuf *answer, int anslen, const char *qname, int qtype, 139 struct hostent *he, struct hostent_data *hed, res_state statp) 140 { 141 const HEADER *hp; 142 const u_char *cp; 143 int n; 144 const u_char *eom, *erdata; 145 char *bp, *ep, **ap, **hap; 146 int type, class, ancount, qdcount; 147 int haveanswer, had_error; 148 int toobig = 0; 149 char tbuf[MAXDNAME]; 150 const char *tname; 151 int (*name_ok)(const char *); 152 153 tname = qname; 154 he->h_name = NULL; 155 eom = answer->buf + anslen; 156 switch (qtype) { 157 case T_A: 158 case T_AAAA: 159 name_ok = res_hnok; 160 break; 161 case T_PTR: 162 name_ok = res_dnok; 163 break; 164 default: 165 RES_SET_H_ERRNO(statp, NO_RECOVERY); 166 return (-1); /* XXX should be abort(); */ 167 } 168 /* 169 * find first satisfactory answer 170 */ 171 hp = &answer->hdr; 172 ancount = ntohs(hp->ancount); 173 qdcount = ntohs(hp->qdcount); 174 bp = hed->hostbuf; 175 ep = hed->hostbuf + sizeof hed->hostbuf; 176 cp = answer->buf; 177 BOUNDED_INCR(HFIXEDSZ); 178 if (qdcount != 1) { 179 RES_SET_H_ERRNO(statp, NO_RECOVERY); 180 return (-1); 181 } 182 n = dn_expand(answer->buf, eom, cp, bp, ep - bp); 183 if ((n < 0) || !(*name_ok)(bp)) { 184 RES_SET_H_ERRNO(statp, NO_RECOVERY); 185 return (-1); 186 } 187 BOUNDED_INCR(n + QFIXEDSZ); 188 if (qtype == T_A || qtype == T_AAAA) { 189 /* res_send() has already verified that the query name is the 190 * same as the one we sent; this just gets the expanded name 191 * (i.e., with the succeeding search-domain tacked on). 192 */ 193 n = strlen(bp) + 1; /* for the \0 */ 194 if (n >= MAXHOSTNAMELEN) { 195 RES_SET_H_ERRNO(statp, NO_RECOVERY); 196 return (-1); 197 } 198 he->h_name = bp; 199 bp += n; 200 /* The qname can be abbreviated, but h_name is now absolute. */ 201 qname = he->h_name; 202 } 203 ap = hed->host_aliases; 204 *ap = NULL; 205 he->h_aliases = hed->host_aliases; 206 hap = hed->h_addr_ptrs; 207 *hap = NULL; 208 he->h_addr_list = hed->h_addr_ptrs; 209 haveanswer = 0; 210 had_error = 0; 211 _dns_ttl_ = -1; 212 while (ancount-- > 0 && cp < eom && !had_error) { 213 n = dn_expand(answer->buf, eom, cp, bp, ep - bp); 214 if ((n < 0) || !(*name_ok)(bp)) { 215 had_error++; 216 continue; 217 } 218 cp += n; /* name */ 219 BOUNDS_CHECK(cp, 3 * INT16SZ + INT32SZ); 220 type = _getshort(cp); 221 cp += INT16SZ; /* type */ 222 class = _getshort(cp); 223 cp += INT16SZ; /* class */ 224 if (qtype == T_A && type == T_A) 225 _dns_ttl_ = _getlong(cp); 226 cp += INT32SZ; /* TTL */ 227 n = _getshort(cp); 228 cp += INT16SZ; /* len */ 229 BOUNDS_CHECK(cp, n); 230 erdata = cp + n; 231 if (class != C_IN) { 232 /* XXX - debug? syslog? */ 233 cp += n; 234 continue; /* XXX - had_error++ ? */ 235 } 236 if ((qtype == T_A || qtype == T_AAAA) && type == T_CNAME) { 237 if (ap >= &hed->host_aliases[_MAXALIASES-1]) 238 continue; 239 n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf); 240 if ((n < 0) || !(*name_ok)(tbuf)) { 241 had_error++; 242 continue; 243 } 244 cp += n; 245 if (cp != erdata) { 246 RES_SET_H_ERRNO(statp, NO_RECOVERY); 247 return (-1); 248 } 249 /* Store alias. */ 250 *ap++ = bp; 251 n = strlen(bp) + 1; /* for the \0 */ 252 if (n >= MAXHOSTNAMELEN) { 253 had_error++; 254 continue; 255 } 256 bp += n; 257 /* Get canonical name. */ 258 n = strlen(tbuf) + 1; /* for the \0 */ 259 if (n > ep - bp || n >= MAXHOSTNAMELEN) { 260 had_error++; 261 continue; 262 } 263 strcpy(bp, tbuf); 264 he->h_name = bp; 265 bp += n; 266 continue; 267 } 268 if (qtype == T_PTR && type == T_CNAME) { 269 n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf); 270 if (n < 0 || !res_dnok(tbuf)) { 271 had_error++; 272 continue; 273 } 274 cp += n; 275 if (cp != erdata) { 276 RES_SET_H_ERRNO(statp, NO_RECOVERY); 277 return (-1); 278 } 279 /* Get canonical name. */ 280 n = strlen(tbuf) + 1; /* for the \0 */ 281 if (n > ep - bp || n >= MAXHOSTNAMELEN) { 282 had_error++; 283 continue; 284 } 285 strcpy(bp, tbuf); 286 tname = bp; 287 bp += n; 288 continue; 289 } 290 if (type != qtype) { 291 if (type != T_SIG) 292 syslog(LOG_NOTICE|LOG_AUTH, 293 "gethostby*.gethostanswer: asked for \"%s %s %s\", got type \"%s\"", 294 qname, p_class(C_IN), p_type(qtype), 295 p_type(type)); 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 __unused, va_list ap) 463 { 464 const char *name; 465 int af; 466 char *buffer; 467 size_t buflen; 468 int *errnop __unused; 469 int *h_errnop; 470 struct hostent *hptr, he; 471 struct hostent_data *hed; 472 querybuf *buf; 473 int n, type, error; 474 res_state statp; 475 476 name = va_arg(ap, const char *); 477 af = va_arg(ap, int); 478 hptr = va_arg(ap, struct hostent *); 479 buffer = va_arg(ap, char *); 480 buflen = va_arg(ap, size_t); 481 errnop = va_arg(ap, int *); 482 h_errnop = va_arg(ap, int *); 483 484 *((struct hostent **)rval) = NULL; 485 486 statp = __res_state(); 487 if ((hed = __hostent_data_init()) == NULL) { 488 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 489 *h_errnop = statp->res_h_errno; 490 return (NS_NOTFOUND); 491 } 492 493 he.h_addrtype = af; 494 switch (af) { 495 case AF_INET: 496 he.h_length = NS_INADDRSZ; 497 type = T_A; 498 break; 499 case AF_INET6: 500 he.h_length = NS_IN6ADDRSZ; 501 type = T_AAAA; 502 break; 503 default: 504 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 505 *h_errnop = statp->res_h_errno; 506 errno = EAFNOSUPPORT; 507 return (NS_UNAVAIL); 508 } 509 510 if ((buf = malloc(sizeof(*buf))) == NULL) { 511 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 512 *h_errnop = statp->res_h_errno; 513 return (NS_NOTFOUND); 514 } 515 n = res_nsearch(statp, name, C_IN, type, buf->buf, sizeof(buf->buf)); 516 if (n < 0) { 517 free(buf); 518 dbg_printf("res_nsearch failed (%d)\n", n, statp); 519 *h_errnop = statp->res_h_errno; 520 return (0); 521 } else if (n > sizeof(buf->buf)) { 522 free(buf); 523 dbg_printf("static buffer is too small (%d)\n", n, statp); 524 *h_errnop = statp->res_h_errno; 525 return (0); 526 } 527 error = gethostanswer(buf, n, name, type, &he, hed, statp); 528 free(buf); 529 if (error != 0) { 530 *h_errnop = statp->res_h_errno; 531 return (NS_NOTFOUND); 532 } 533 if (__copy_hostent(&he, hptr, buffer, buflen) != 0) { 534 *h_errnop = statp->res_h_errno; 535 return (NS_NOTFOUND); 536 } 537 *((struct hostent **)rval) = hptr; 538 return (NS_SUCCESS); 539 } 540 541 int 542 _dns_gethostbyaddr(void *rval, void *cb_data __unused, va_list ap) 543 { 544 const void *addr; 545 socklen_t len; 546 int af; 547 char *buffer; 548 size_t buflen; 549 int *errnop __unused; 550 int *h_errnop; 551 const u_char *uaddr; 552 struct hostent *hptr, he; 553 struct hostent_data *hed; 554 int n; 555 querybuf *buf; 556 char qbuf[MAXDNAME+1], *qp; 557 res_state statp; 558 #ifdef SUNSECURITY 559 struct hostdata rhd; 560 struct hostent *rhe; 561 char **haddr; 562 u_long old_options; 563 char hname2[MAXDNAME+1], numaddr[46]; 564 int ret_h_error; 565 #endif /*SUNSECURITY*/ 566 567 addr = va_arg(ap, const void *); 568 len = va_arg(ap, socklen_t); 569 af = va_arg(ap, int); 570 hptr = va_arg(ap, struct hostent *); 571 buffer = va_arg(ap, char *); 572 buflen = va_arg(ap, size_t); 573 errnop = va_arg(ap, int *); 574 h_errnop = va_arg(ap, int *); 575 uaddr = (const u_char *)addr; 576 577 *((struct hostent **)rval) = NULL; 578 579 statp = __res_state(); 580 if ((hed = __hostent_data_init()) == NULL) { 581 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 582 *h_errnop = statp->res_h_errno; 583 return (NS_NOTFOUND); 584 } 585 586 switch (af) { 587 case AF_INET: 588 sprintf(qbuf, "%u.%u.%u.%u.in-addr.arpa", 589 (uaddr[3] & 0xff), 590 (uaddr[2] & 0xff), 591 (uaddr[1] & 0xff), 592 (uaddr[0] & 0xff)); 593 break; 594 case AF_INET6: 595 qp = qbuf; 596 for (n = NS_IN6ADDRSZ - 1; n >= 0; n--) { 597 qp += SPRINTF((qp, "%x.%x.", 598 uaddr[n] & 0xf, 599 (uaddr[n] >> 4) & 0xf)); 600 } 601 strlcat(qbuf, "ip6.arpa", sizeof(qbuf)); 602 break; 603 default: 604 abort(); 605 } 606 if ((buf = malloc(sizeof(*buf))) == NULL) { 607 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 608 *h_errnop = statp->res_h_errno; 609 return NS_NOTFOUND; 610 } 611 n = res_nquery(statp, qbuf, C_IN, T_PTR, (u_char *)buf->buf, 612 sizeof buf->buf); 613 if (n < 0) { 614 free(buf); 615 dbg_printf("res_nquery failed (%d)\n", n, statp); 616 *h_errnop = statp->res_h_errno; 617 return (NS_UNAVAIL); 618 } 619 if (n > sizeof buf->buf) { 620 free(buf); 621 dbg_printf("static buffer is too small (%d)\n", n, statp); 622 *h_errnop = statp->res_h_errno; 623 return (NS_UNAVAIL); 624 } 625 if (gethostanswer(buf, n, qbuf, T_PTR, &he, hed, statp) != 0) { 626 free(buf); 627 *h_errnop = statp->res_h_errno; 628 return (NS_NOTFOUND); /* h_errno was set by gethostanswer() */ 629 } 630 free(buf); 631 #ifdef SUNSECURITY 632 if (af == AF_INET) { 633 /* 634 * turn off search as the name should be absolute, 635 * 'localhost' should be matched by defnames 636 */ 637 strncpy(hname2, he.h_name, MAXDNAME); 638 hname2[MAXDNAME] = '\0'; 639 old_options = statp->options; 640 statp->options &= ~RES_DNSRCH; 641 statp->options |= RES_DEFNAMES; 642 memset(&rhd, 0, sizeof rhd); 643 rhe = gethostbyname_r(hname2, &rhd.host, &rhd.data, 644 sizeof(rhd.data), &ret_h_error); 645 if (rhe == NULL) { 646 if (inet_ntop(af, addr, numaddr, sizeof(numaddr)) == NULL) 647 strlcpy(numaddr, "UNKNOWN", sizeof(numaddr)); 648 syslog(LOG_NOTICE|LOG_AUTH, 649 "gethostbyaddr: No A record for %s (verifying [%s])", 650 hname2, numaddr); 651 statp->options = old_options; 652 RES_SET_H_ERRNO(statp, HOST_NOT_FOUND); 653 *h_errnop = statp->res_h_errno; 654 return (NS_NOTFOUND); 655 } 656 statp->options = old_options; 657 for (haddr = rhe->h_addr_list; *haddr; haddr++) 658 if (!memcmp(*haddr, addr, NS_INADDRSZ)) 659 break; 660 if (!*haddr) { 661 if (inet_ntop(af, addr, numaddr, sizeof(numaddr)) == NULL) 662 strlcpy(numaddr, "UNKNOWN", sizeof(numaddr)); 663 syslog(LOG_NOTICE|LOG_AUTH, 664 "gethostbyaddr: A record of %s != PTR record [%s]", 665 hname2, numaddr); 666 RES_SET_H_ERRNO(statp, HOST_NOT_FOUND); 667 *h_errnop = statp->res_h_errno; 668 return (NS_NOTFOUND); 669 } 670 } 671 #endif /*SUNSECURITY*/ 672 he.h_addrtype = af; 673 he.h_length = len; 674 memcpy(hed->host_addr, uaddr, len); 675 hed->h_addr_ptrs[0] = (char *)hed->host_addr; 676 hed->h_addr_ptrs[1] = NULL; 677 if (af == AF_INET && (statp->options & RES_USE_INET6)) { 678 _map_v4v6_address((char*)hed->host_addr, (char*)hed->host_addr); 679 he.h_addrtype = AF_INET6; 680 he.h_length = NS_IN6ADDRSZ; 681 } 682 RES_SET_H_ERRNO(statp, NETDB_SUCCESS); 683 if (__copy_hostent(&he, hptr, buffer, buflen) != 0) { 684 *h_errnop = statp->res_h_errno; 685 return (NS_NOTFOUND); 686 } 687 *((struct hostent **)rval) = hptr; 688 return (NS_SUCCESS); 689 } 690 691 #ifdef RESOLVSORT 692 static void 693 addrsort(char **ap, int num, res_state res) 694 { 695 int i, j; 696 char **p; 697 short aval[_MAXADDRS]; 698 int needsort = 0; 699 700 p = ap; 701 for (i = 0; i < num; i++, p++) { 702 for (j = 0 ; (unsigned)j < res->nsort; j++) 703 if (res->sort_list[j].addr.s_addr == 704 (((struct in_addr *)(*p))->s_addr & res->sort_list[j].mask)) 705 break; 706 aval[i] = j; 707 if (needsort == 0 && i > 0 && j < aval[i-1]) 708 needsort = i; 709 } 710 if (!needsort) 711 return; 712 713 while (needsort < num) { 714 for (j = needsort - 1; j >= 0; j--) { 715 if (aval[j] > aval[j+1]) { 716 char *hp; 717 718 i = aval[j]; 719 aval[j] = aval[j+1]; 720 aval[j+1] = i; 721 722 hp = ap[j]; 723 ap[j] = ap[j+1]; 724 ap[j+1] = hp; 725 726 } else 727 break; 728 } 729 needsort++; 730 } 731 } 732 #endif 733 734 void 735 _sethostdnsent(int stayopen) 736 { 737 res_state statp; 738 739 statp = __res_state(); 740 if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1) 741 return; 742 if (stayopen) 743 statp->options |= RES_STAYOPEN | RES_USEVC; 744 } 745 746 void 747 _endhostdnsent(void) 748 { 749 res_state statp; 750 751 statp = __res_state(); 752 statp->options &= ~(RES_STAYOPEN | RES_USEVC); 753 res_nclose(statp); 754 } 755