gethostbydns.c revision 331722
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) 53static char sccsid[] = "@(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93"; 54static 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: stable/11/lib/libc/net/gethostbydns.c 331722 2018-03-29 02:50:57Z eadler $"); 58 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 82static const char AskedForGot[] = 83 "gethostby*.gethostanswer: asked for \"%s\", got \"%s\""; 84 85#ifdef RESOLVSORT 86static void addrsort(char **, int, res_state); 87#endif 88 89#ifdef DEBUG 90static void dbg_printf(char *, int, res_state) __printflike(1, 0); 91#endif 92 93#define MAXPACKET (64*1024) 94 95typedef union { 96 HEADER hdr; 97 u_char buf[MAXPACKET]; 98} querybuf; 99 100typedef union { 101 int32_t al; 102 char ac; 103} align; 104 105int _dns_ttl_; 106 107#ifdef DEBUG 108static void 109dbg_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 139static int 140gethostanswer(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 if (type != T_SIG && type != ns_t_dname) 294 syslog(LOG_NOTICE|LOG_AUTH, 295 "gethostby*.gethostanswer: asked for \"%s %s %s\", got type \"%s\"", 296 qname, p_class(C_IN), p_type(qtype), 297 p_type(type)); 298 cp += n; 299 continue; /* XXX - had_error++ ? */ 300 } 301 switch (type) { 302 case T_PTR: 303 if (strcasecmp(tname, bp) != 0) { 304 syslog(LOG_NOTICE|LOG_AUTH, 305 AskedForGot, qname, bp); 306 cp += n; 307 continue; /* XXX - had_error++ ? */ 308 } 309 n = dn_expand(answer->buf, eom, cp, bp, ep - bp); 310 if ((n < 0) || !res_hnok(bp)) { 311 had_error++; 312 break; 313 } 314#if MULTI_PTRS_ARE_ALIASES 315 cp += n; 316 if (cp != erdata) { 317 RES_SET_H_ERRNO(statp, NO_RECOVERY); 318 return (-1); 319 } 320 if (!haveanswer) 321 he->h_name = bp; 322 else if (ap < &hed->host_aliases[_MAXALIASES-1]) 323 *ap++ = bp; 324 else 325 n = -1; 326 if (n != -1) { 327 n = strlen(bp) + 1; /* for the \0 */ 328 if (n >= MAXHOSTNAMELEN) { 329 had_error++; 330 break; 331 } 332 bp += n; 333 } 334 break; 335#else 336 he->h_name = bp; 337 if (statp->options & RES_USE_INET6) { 338 n = strlen(bp) + 1; /* for the \0 */ 339 if (n >= MAXHOSTNAMELEN) { 340 had_error++; 341 break; 342 } 343 bp += n; 344 _map_v4v6_hostent(he, &bp, ep); 345 } 346 RES_SET_H_ERRNO(statp, NETDB_SUCCESS); 347 return (0); 348#endif 349 case T_A: 350 case T_AAAA: 351 if (strcasecmp(he->h_name, bp) != 0) { 352 syslog(LOG_NOTICE|LOG_AUTH, 353 AskedForGot, he->h_name, bp); 354 cp += n; 355 continue; /* XXX - had_error++ ? */ 356 } 357 if (n != he->h_length) { 358 cp += n; 359 continue; 360 } 361 if (!haveanswer) { 362 int nn; 363 364 he->h_name = bp; 365 nn = strlen(bp) + 1; /* for the \0 */ 366 bp += nn; 367 } 368 369 bp += sizeof(align) - ((u_long)bp % sizeof(align)); 370 371 if (bp + n >= ep) { 372 dbg_printf("size (%d) too big\n", n, statp); 373 had_error++; 374 continue; 375 } 376 if (hap >= &hed->h_addr_ptrs[_MAXADDRS-1]) { 377 if (!toobig++) 378 dbg_printf("Too many addresses (%d)\n", 379 _MAXADDRS, statp); 380 cp += n; 381 continue; 382 } 383 memcpy(*hap++ = bp, cp, n); 384 bp += n; 385 cp += n; 386 if (cp != erdata) { 387 RES_SET_H_ERRNO(statp, NO_RECOVERY); 388 return (-1); 389 } 390 break; 391 default: 392 dbg_printf("Impossible condition (type=%d)\n", type, 393 statp); 394 RES_SET_H_ERRNO(statp, NO_RECOVERY); 395 return (-1); 396 /* BIND has abort() here, too risky on bad data */ 397 } 398 if (!had_error) 399 haveanswer++; 400 } 401 if (haveanswer) { 402 *ap = NULL; 403 *hap = NULL; 404# if defined(RESOLVSORT) 405 /* 406 * Note: we sort even if host can take only one address 407 * in its return structures - should give it the "best" 408 * address in that case, not some random one 409 */ 410 if (statp->nsort && haveanswer > 1 && qtype == T_A) 411 addrsort(hed->h_addr_ptrs, haveanswer, statp); 412# endif /*RESOLVSORT*/ 413 if (!he->h_name) { 414 n = strlen(qname) + 1; /* for the \0 */ 415 if (n > ep - bp || n >= MAXHOSTNAMELEN) 416 goto no_recovery; 417 strcpy(bp, qname); 418 he->h_name = bp; 419 bp += n; 420 } 421 if (statp->options & RES_USE_INET6) 422 _map_v4v6_hostent(he, &bp, ep); 423 RES_SET_H_ERRNO(statp, NETDB_SUCCESS); 424 return (0); 425 } 426 no_recovery: 427 RES_SET_H_ERRNO(statp, NO_RECOVERY); 428 return (-1); 429} 430 431/* XXX: for async DNS resolver in ypserv */ 432struct hostent * 433__dns_getanswer(const char *answer, int anslen, const char *qname, int qtype) 434{ 435 struct hostent *he; 436 struct hostent_data *hed; 437 int error; 438 res_state statp; 439 440 statp = __res_state(); 441 if ((he = __hostent_init()) == NULL || 442 (hed = __hostent_data_init()) == NULL) { 443 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 444 return (NULL); 445 } 446 switch (qtype) { 447 case T_AAAA: 448 he->h_addrtype = AF_INET6; 449 he->h_length = NS_IN6ADDRSZ; 450 break; 451 case T_A: 452 default: 453 he->h_addrtype = AF_INET; 454 he->h_length = NS_INADDRSZ; 455 break; 456 } 457 458 error = gethostanswer((const querybuf *)answer, anslen, qname, qtype, 459 he, hed, statp); 460 return (error == 0) ? he : NULL; 461} 462 463int 464_dns_gethostbyname(void *rval, void *cb_data, va_list ap) 465{ 466 const char *name; 467 int af; 468 char *buffer; 469 size_t buflen; 470 int *errnop, *h_errnop; 471 struct hostent *hptr, he; 472 struct hostent_data *hed; 473 querybuf *buf; 474 int n, type, error; 475 res_state statp; 476 477 name = va_arg(ap, const char *); 478 af = va_arg(ap, int); 479 hptr = va_arg(ap, struct hostent *); 480 buffer = va_arg(ap, char *); 481 buflen = va_arg(ap, size_t); 482 errnop = va_arg(ap, int *); 483 h_errnop = va_arg(ap, int *); 484 485 *((struct hostent **)rval) = NULL; 486 487 statp = __res_state(); 488 if ((hed = __hostent_data_init()) == NULL) { 489 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 490 *h_errnop = statp->res_h_errno; 491 return (NS_NOTFOUND); 492 } 493 494 he.h_addrtype = af; 495 switch (af) { 496 case AF_INET: 497 he.h_length = NS_INADDRSZ; 498 type = T_A; 499 break; 500 case AF_INET6: 501 he.h_length = NS_IN6ADDRSZ; 502 type = T_AAAA; 503 break; 504 default: 505 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 506 *h_errnop = statp->res_h_errno; 507 errno = EAFNOSUPPORT; 508 return (NS_UNAVAIL); 509 } 510 511 if ((buf = malloc(sizeof(*buf))) == NULL) { 512 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 513 *h_errnop = statp->res_h_errno; 514 return (NS_NOTFOUND); 515 } 516 n = res_nsearch(statp, name, C_IN, type, buf->buf, sizeof(buf->buf)); 517 if (n < 0) { 518 free(buf); 519 dbg_printf("res_nsearch failed (%d)\n", n, statp); 520 *h_errnop = statp->res_h_errno; 521 return (NS_NOTFOUND); 522 } else if (n > sizeof(buf->buf)) { 523 free(buf); 524 dbg_printf("static buffer is too small (%d)\n", n, statp); 525 *h_errnop = statp->res_h_errno; 526 return (NS_UNAVAIL); 527 } 528 error = gethostanswer(buf, n, name, type, &he, hed, statp); 529 free(buf); 530 if (error != 0) { 531 *h_errnop = statp->res_h_errno; 532 switch (statp->res_h_errno) { 533 case HOST_NOT_FOUND: 534 return (NS_NOTFOUND); 535 case TRY_AGAIN: 536 return (NS_TRYAGAIN); 537 default: 538 return (NS_UNAVAIL); 539 } 540 /*NOTREACHED*/ 541 } 542 if (__copy_hostent(&he, hptr, buffer, buflen) != 0) { 543 *errnop = errno; 544 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 545 *h_errnop = statp->res_h_errno; 546 return (NS_RETURN); 547 } 548 RES_SET_H_ERRNO(statp, NETDB_SUCCESS); 549 *((struct hostent **)rval) = hptr; 550 return (NS_SUCCESS); 551} 552 553int 554_dns_gethostbyaddr(void *rval, void *cb_data, va_list ap) 555{ 556 const void *addr; 557 socklen_t len; 558 int af; 559 char *buffer; 560 size_t buflen; 561 int *errnop, *h_errnop; 562 const u_char *uaddr; 563 struct hostent *hptr, he; 564 struct hostent_data *hed; 565 int n; 566 querybuf *buf; 567 char qbuf[MAXDNAME+1], *qp; 568 res_state statp; 569#ifdef SUNSECURITY 570 struct hostdata rhd; 571 struct hostent *rhe; 572 char **haddr; 573 u_long old_options; 574 char hname2[MAXDNAME+1], numaddr[46]; 575 int ret_h_error; 576#endif /*SUNSECURITY*/ 577 578 addr = va_arg(ap, const void *); 579 len = va_arg(ap, socklen_t); 580 af = va_arg(ap, int); 581 hptr = va_arg(ap, struct hostent *); 582 buffer = va_arg(ap, char *); 583 buflen = va_arg(ap, size_t); 584 errnop = va_arg(ap, int *); 585 h_errnop = va_arg(ap, int *); 586 uaddr = (const u_char *)addr; 587 588 *((struct hostent **)rval) = NULL; 589 590 statp = __res_state(); 591 if ((hed = __hostent_data_init()) == NULL) { 592 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 593 *h_errnop = statp->res_h_errno; 594 return (NS_NOTFOUND); 595 } 596 597 switch (af) { 598 case AF_INET: 599 (void) sprintf(qbuf, "%u.%u.%u.%u.in-addr.arpa", 600 (uaddr[3] & 0xff), 601 (uaddr[2] & 0xff), 602 (uaddr[1] & 0xff), 603 (uaddr[0] & 0xff)); 604 break; 605 case AF_INET6: 606 qp = qbuf; 607 for (n = NS_IN6ADDRSZ - 1; n >= 0; n--) { 608 qp += SPRINTF((qp, "%x.%x.", 609 uaddr[n] & 0xf, 610 (uaddr[n] >> 4) & 0xf)); 611 } 612 strlcat(qbuf, "ip6.arpa", sizeof(qbuf)); 613 break; 614 default: 615 abort(); 616 } 617 if ((buf = malloc(sizeof(*buf))) == NULL) { 618 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 619 *h_errnop = statp->res_h_errno; 620 return NS_NOTFOUND; 621 } 622 n = res_nquery(statp, qbuf, C_IN, T_PTR, (u_char *)buf->buf, 623 sizeof buf->buf); 624 if (n < 0) { 625 free(buf); 626 dbg_printf("res_nquery failed (%d)\n", n, statp); 627 *h_errnop = statp->res_h_errno; 628 return (NS_UNAVAIL); 629 } 630 if (n > sizeof buf->buf) { 631 free(buf); 632 dbg_printf("static buffer is too small (%d)\n", n, statp); 633 *h_errnop = statp->res_h_errno; 634 return (NS_UNAVAIL); 635 } 636 if (gethostanswer(buf, n, qbuf, T_PTR, &he, hed, statp) != 0) { 637 free(buf); 638 *h_errnop = statp->res_h_errno; 639 switch (statp->res_h_errno) { 640 case HOST_NOT_FOUND: 641 return (NS_NOTFOUND); 642 case TRY_AGAIN: 643 return (NS_TRYAGAIN); 644 default: 645 return (NS_UNAVAIL); 646 } 647 /*NOTREACHED*/ 648 } 649 free(buf); 650#ifdef SUNSECURITY 651 if (af == AF_INET) { 652 /* 653 * turn off search as the name should be absolute, 654 * 'localhost' should be matched by defnames 655 */ 656 strncpy(hname2, he.h_name, MAXDNAME); 657 hname2[MAXDNAME] = '\0'; 658 old_options = statp->options; 659 statp->options &= ~RES_DNSRCH; 660 statp->options |= RES_DEFNAMES; 661 memset(&rhd, 0, sizeof rhd); 662 rhe = gethostbyname_r(hname2, &rhd.host, &rhd.data, 663 sizeof(rhd.data), &ret_h_error); 664 if (rhe == NULL) { 665 if (inet_ntop(af, addr, numaddr, sizeof(numaddr)) == NULL) 666 strlcpy(numaddr, "UNKNOWN", sizeof(numaddr)); 667 syslog(LOG_NOTICE|LOG_AUTH, 668 "gethostbyaddr: No A record for %s (verifying [%s])", 669 hname2, numaddr); 670 statp->options = old_options; 671 RES_SET_H_ERRNO(statp, HOST_NOT_FOUND); 672 *h_errnop = statp->res_h_errno; 673 return (NS_NOTFOUND); 674 } 675 statp->options = old_options; 676 for (haddr = rhe->h_addr_list; *haddr; haddr++) 677 if (!memcmp(*haddr, addr, NS_INADDRSZ)) 678 break; 679 if (!*haddr) { 680 if (inet_ntop(af, addr, numaddr, sizeof(numaddr)) == NULL) 681 strlcpy(numaddr, "UNKNOWN", sizeof(numaddr)); 682 syslog(LOG_NOTICE|LOG_AUTH, 683 "gethostbyaddr: A record of %s != PTR record [%s]", 684 hname2, numaddr); 685 RES_SET_H_ERRNO(statp, HOST_NOT_FOUND); 686 *h_errnop = statp->res_h_errno; 687 return (NS_NOTFOUND); 688 } 689 } 690#endif /*SUNSECURITY*/ 691 he.h_addrtype = af; 692 he.h_length = len; 693 memcpy(hed->host_addr, uaddr, len); 694 hed->h_addr_ptrs[0] = (char *)hed->host_addr; 695 hed->h_addr_ptrs[1] = NULL; 696 if (af == AF_INET && (statp->options & RES_USE_INET6)) { 697 _map_v4v6_address((char*)hed->host_addr, (char*)hed->host_addr); 698 he.h_addrtype = AF_INET6; 699 he.h_length = NS_IN6ADDRSZ; 700 } 701 if (__copy_hostent(&he, hptr, buffer, buflen) != 0) { 702 *errnop = errno; 703 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 704 *h_errnop = statp->res_h_errno; 705 return (NS_RETURN); 706 } 707 RES_SET_H_ERRNO(statp, NETDB_SUCCESS); 708 *((struct hostent **)rval) = hptr; 709 return (NS_SUCCESS); 710} 711 712#ifdef RESOLVSORT 713static void 714addrsort(char **ap, int num, res_state res) 715{ 716 int i, j; 717 char **p; 718 short aval[_MAXADDRS]; 719 int needsort = 0; 720 721 p = ap; 722 for (i = 0; i < num; i++, p++) { 723 for (j = 0 ; (unsigned)j < res->nsort; j++) 724 if (res->sort_list[j].addr.s_addr == 725 (((struct in_addr *)(*p))->s_addr & res->sort_list[j].mask)) 726 break; 727 aval[i] = j; 728 if (needsort == 0 && i > 0 && j < aval[i-1]) 729 needsort = i; 730 } 731 if (!needsort) 732 return; 733 734 while (needsort < num) { 735 for (j = needsort - 1; j >= 0; j--) { 736 if (aval[j] > aval[j+1]) { 737 char *hp; 738 739 i = aval[j]; 740 aval[j] = aval[j+1]; 741 aval[j+1] = i; 742 743 hp = ap[j]; 744 ap[j] = ap[j+1]; 745 ap[j+1] = hp; 746 747 } else 748 break; 749 } 750 needsort++; 751 } 752} 753#endif 754 755void 756_sethostdnsent(int stayopen) 757{ 758 res_state statp; 759 760 statp = __res_state(); 761 if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1) 762 return; 763 if (stayopen) 764 statp->options |= RES_STAYOPEN | RES_USEVC; 765} 766 767void 768_endhostdnsent(void) 769{ 770 res_state statp; 771 772 statp = __res_state(); 773 statp->options &= ~(RES_STAYOPEN | RES_USEVC); 774 res_nclose(statp); 775} 776