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) 53 static char sccsid[] = "@(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93"; 54 static 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 83 static const char AskedForGot[] = 84 "gethostby*.gethostanswer: asked for \"%s\", got \"%s\""; 85 86 #ifdef RESOLVSORT 87 static void addrsort(char **, int, res_state); 88 #endif 89 90 #ifdef DEBUG 91 static void dprintf(char *, int, res_state) __printflike(1, 0); 92 #endif 93 94 #define MAXPACKET (64*1024) 95 96 typedef union { 97 HEADER hdr; 98 u_char buf[MAXPACKET]; 99 } querybuf; 100 101 typedef union { 102 int32_t al; 103 char ac; 104 } align; 105 106 int _dns_ttl_; 107 108 #ifdef DEBUG 109 static void 110 dprintf(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) 142 143 static int 144 gethostanswer(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 */ 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 dprintf("res_nsearch failed (%d)\n", n, statp); 524 *h_errnop = statp->res_h_errno; 525 return (0); 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 (0); 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 return (NS_NOTFOUND); 537 } 538 if (__copy_hostent(&he, hptr, buffer, buflen) != 0) { 539 *h_errnop = statp->res_h_errno; 540 return (NS_NOTFOUND); 541 } 542 *((struct hostent **)rval) = hptr; 543 return (NS_SUCCESS); 544 } 545 546 int 547 _dns_gethostbyaddr(void *rval, void *cb_data, va_list ap) 548 { 549 const void *addr; 550 socklen_t len; 551 int af; 552 char *buffer; 553 size_t buflen; 554 int *errnop, *h_errnop; 555 const u_char *uaddr; 556 struct hostent *hptr, he; 557 struct hostent_data *hed; 558 int n; 559 querybuf *buf; 560 char qbuf[MAXDNAME+1], *qp; 561 res_state statp; 562 #ifdef SUNSECURITY 563 struct hostdata rhd; 564 struct hostent *rhe; 565 char **haddr; 566 u_long old_options; 567 char hname2[MAXDNAME+1], numaddr[46]; 568 int ret_h_error; 569 #endif /*SUNSECURITY*/ 570 571 addr = va_arg(ap, const void *); 572 len = va_arg(ap, socklen_t); 573 af = va_arg(ap, int); 574 hptr = va_arg(ap, struct hostent *); 575 buffer = va_arg(ap, char *); 576 buflen = va_arg(ap, size_t); 577 errnop = va_arg(ap, int *); 578 h_errnop = va_arg(ap, int *); 579 uaddr = (const u_char *)addr; 580 581 *((struct hostent **)rval) = NULL; 582 583 statp = __res_state(); 584 if ((hed = __hostent_data_init()) == NULL) { 585 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 586 *h_errnop = statp->res_h_errno; 587 return (NS_NOTFOUND); 588 } 589 590 switch (af) { 591 case AF_INET: 592 (void) sprintf(qbuf, "%u.%u.%u.%u.in-addr.arpa", 593 (uaddr[3] & 0xff), 594 (uaddr[2] & 0xff), 595 (uaddr[1] & 0xff), 596 (uaddr[0] & 0xff)); 597 break; 598 case AF_INET6: 599 qp = qbuf; 600 for (n = NS_IN6ADDRSZ - 1; n >= 0; n--) { 601 qp += SPRINTF((qp, "%x.%x.", 602 uaddr[n] & 0xf, 603 (uaddr[n] >> 4) & 0xf)); 604 } 605 strlcat(qbuf, "ip6.arpa", sizeof(qbuf)); 606 break; 607 default: 608 abort(); 609 } 610 if ((buf = malloc(sizeof(*buf))) == NULL) { 611 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 612 *h_errnop = statp->res_h_errno; 613 return NS_NOTFOUND; 614 } 615 n = res_nquery(statp, qbuf, C_IN, T_PTR, (u_char *)buf->buf, 616 sizeof buf->buf); 617 if (n < 0) { 618 free(buf); 619 dprintf("res_nquery failed (%d)\n", n, statp); 620 *h_errnop = statp->res_h_errno; 621 return (NS_UNAVAIL); 622 } 623 if (n > sizeof buf->buf) { 624 free(buf); 625 dprintf("static buffer is too small (%d)\n", n, statp); 626 *h_errnop = statp->res_h_errno; 627 return (NS_UNAVAIL); 628 } 629 if (gethostanswer(buf, n, qbuf, T_PTR, &he, hed, statp) != 0) { 630 free(buf); 631 *h_errnop = statp->res_h_errno; 632 return (NS_NOTFOUND); /* h_errno was set by gethostanswer() */ 633 } 634 free(buf); 635 #ifdef SUNSECURITY 636 if (af == AF_INET) { 637 /* 638 * turn off search as the name should be absolute, 639 * 'localhost' should be matched by defnames 640 */ 641 strncpy(hname2, he.h_name, MAXDNAME); 642 hname2[MAXDNAME] = '\0'; 643 old_options = statp->options; 644 statp->options &= ~RES_DNSRCH; 645 statp->options |= RES_DEFNAMES; 646 memset(&rhd, 0, sizeof rhd); 647 rhe = gethostbyname_r(hname2, &rhd.host, &rhd.data, 648 sizeof(rhd.data), &ret_h_error); 649 if (rhe == NULL) { 650 if (inet_ntop(af, addr, numaddr, sizeof(numaddr)) == NULL) 651 strlcpy(numaddr, "UNKNOWN", sizeof(numaddr)); 652 syslog(LOG_NOTICE|LOG_AUTH, 653 "gethostbyaddr: No A record for %s (verifying [%s])", 654 hname2, numaddr); 655 statp->options = old_options; 656 RES_SET_H_ERRNO(statp, HOST_NOT_FOUND); 657 *h_errnop = statp->res_h_errno; 658 return (NS_NOTFOUND); 659 } 660 statp->options = old_options; 661 for (haddr = rhe->h_addr_list; *haddr; haddr++) 662 if (!memcmp(*haddr, addr, NS_INADDRSZ)) 663 break; 664 if (!*haddr) { 665 if (inet_ntop(af, addr, numaddr, sizeof(numaddr)) == NULL) 666 strlcpy(numaddr, "UNKNOWN", sizeof(numaddr)); 667 syslog(LOG_NOTICE|LOG_AUTH, 668 "gethostbyaddr: A record of %s != PTR record [%s]", 669 hname2, numaddr); 670 RES_SET_H_ERRNO(statp, HOST_NOT_FOUND); 671 *h_errnop = statp->res_h_errno; 672 return (NS_NOTFOUND); 673 } 674 } 675 #endif /*SUNSECURITY*/ 676 he.h_addrtype = af; 677 he.h_length = len; 678 memcpy(hed->host_addr, uaddr, len); 679 hed->h_addr_ptrs[0] = (char *)hed->host_addr; 680 hed->h_addr_ptrs[1] = NULL; 681 if (af == AF_INET && (statp->options & RES_USE_INET6)) { 682 _map_v4v6_address((char*)hed->host_addr, (char*)hed->host_addr); 683 he.h_addrtype = AF_INET6; 684 he.h_length = NS_IN6ADDRSZ; 685 } 686 RES_SET_H_ERRNO(statp, NETDB_SUCCESS); 687 if (__copy_hostent(&he, hptr, buffer, buflen) != 0) { 688 *h_errnop = statp->res_h_errno; 689 return (NS_NOTFOUND); 690 } 691 *((struct hostent **)rval) = hptr; 692 return (NS_SUCCESS); 693 } 694 695 #ifdef RESOLVSORT 696 static void 697 addrsort(char **ap, int num, res_state res) 698 { 699 int i, j; 700 char **p; 701 short aval[_MAXADDRS]; 702 int needsort = 0; 703 704 p = ap; 705 for (i = 0; i < num; i++, p++) { 706 for (j = 0 ; (unsigned)j < res->nsort; j++) 707 if (res->sort_list[j].addr.s_addr == 708 (((struct in_addr *)(*p))->s_addr & res->sort_list[j].mask)) 709 break; 710 aval[i] = j; 711 if (needsort == 0 && i > 0 && j < aval[i-1]) 712 needsort = i; 713 } 714 if (!needsort) 715 return; 716 717 while (needsort < num) { 718 for (j = needsort - 1; j >= 0; j--) { 719 if (aval[j] > aval[j+1]) { 720 char *hp; 721 722 i = aval[j]; 723 aval[j] = aval[j+1]; 724 aval[j+1] = i; 725 726 hp = ap[j]; 727 ap[j] = ap[j+1]; 728 ap[j+1] = hp; 729 730 } else 731 break; 732 } 733 needsort++; 734 } 735 } 736 #endif 737 738 void 739 _sethostdnsent(int stayopen) 740 { 741 res_state statp; 742 743 statp = __res_state(); 744 if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1) 745 return; 746 if (stayopen) 747 statp->options |= RES_STAYOPEN | RES_USEVC; 748 } 749 750 void 751 _endhostdnsent() 752 { 753 res_state statp; 754 755 statp = __res_state(); 756 statp->options &= ~(RES_STAYOPEN | RES_USEVC); 757 res_nclose(statp); 758 } 759