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