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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * - 35 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 36 * 37 * Permission to use, copy, modify, and distribute this software for any 38 * purpose with or without fee is hereby granted, provided that the above 39 * copyright notice and this permission notice appear in all copies, and that 40 * the name of Digital Equipment Corporation not be used in advertising or 41 * publicity pertaining to distribution of the document or software without 42 * specific, written prior permission. 43 * 44 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 45 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 46 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 47 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 48 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 49 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 50 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 51 * SOFTWARE. 52 * - 53 * --Copyright-- 54 */ 55 56 #if defined(LIBC_SCCS) && !defined(lint) 57 static char sccsid[] = "@(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93"; 58 static char fromrcsid[] = "From: Id: gethnamaddr.c,v 8.23 1998/04/07 04:59:46 vixie Exp $"; 59 #endif /* LIBC_SCCS and not lint */ 60 #include <sys/cdefs.h> 61 __FBSDID("$FreeBSD$"); 62 63 #include <sys/types.h> 64 #include <sys/param.h> 65 #include <sys/socket.h> 66 #include <netinet/in.h> 67 #include <arpa/inet.h> 68 #include <arpa/nameser.h> 69 70 #include <stdio.h> 71 #include <unistd.h> 72 #include <string.h> 73 #include <netdb.h> 74 #include <resolv.h> 75 #include <ctype.h> 76 #include <errno.h> 77 #include <syslog.h> 78 #include <stdarg.h> 79 #include <nsswitch.h> 80 81 #include "res_config.h" 82 83 #define SPRINTF(x) ((size_t)sprintf x) 84 85 #define MAXALIASES 35 86 #define MAXADDRS 35 87 88 static const char AskedForGot[] = 89 "gethostby*.gethostanswer: asked for \"%s\", got \"%s\""; 90 91 static char *h_addr_ptrs[MAXADDRS + 1]; 92 93 static struct hostent host; 94 static char *host_aliases[MAXALIASES]; 95 static char hostbuf[8*1024]; 96 static u_char host_addr[16]; /* IPv4 or IPv6 */ 97 98 #ifdef RESOLVSORT 99 static void addrsort(char **, int); 100 #endif 101 102 #ifdef DEBUG 103 static void dprintf(char *, int) __printflike(1, 0); 104 #endif 105 106 #if PACKETSZ > 1024 107 #define MAXPACKET PACKETSZ 108 #else 109 #define MAXPACKET 1024 110 #endif 111 112 typedef union { 113 HEADER hdr; 114 u_char buf[MAXPACKET]; 115 } querybuf; 116 117 typedef union { 118 int32_t al; 119 char ac; 120 } align; 121 122 extern int h_errno; 123 int _dns_ttl_; 124 125 #ifdef DEBUG 126 static void 127 dprintf(msg, num) 128 char *msg; 129 int num; 130 { 131 if (_res.options & RES_DEBUG) { 132 int save = errno; 133 134 printf(msg, num); 135 errno = save; 136 } 137 } 138 #else 139 # define dprintf(msg, num) /*nada*/ 140 #endif 141 142 #define BOUNDED_INCR(x) \ 143 do { \ 144 cp += x; \ 145 if (cp > eom) { \ 146 h_errno = NO_RECOVERY; \ 147 return (NULL); \ 148 } \ 149 } while (0) 150 151 #define BOUNDS_CHECK(ptr, count) \ 152 do { \ 153 if ((ptr) + (count) > eom) { \ 154 h_errno = NO_RECOVERY; \ 155 return (NULL); \ 156 } \ 157 } while (0) 158 159 static struct hostent * 160 gethostanswer(answer, anslen, qname, qtype) 161 const querybuf *answer; 162 int anslen; 163 const char *qname; 164 int qtype; 165 { 166 const HEADER *hp; 167 const u_char *cp; 168 int n; 169 const u_char *eom, *erdata; 170 char *bp, *ep, **ap, **hap; 171 int type, class, ancount, qdcount; 172 int haveanswer, had_error; 173 int toobig = 0; 174 char tbuf[MAXDNAME]; 175 const char *tname; 176 int (*name_ok)(const char *); 177 178 tname = qname; 179 host.h_name = NULL; 180 eom = answer->buf + anslen; 181 switch (qtype) { 182 case T_A: 183 case T_AAAA: 184 name_ok = res_hnok; 185 break; 186 case T_PTR: 187 name_ok = res_dnok; 188 break; 189 default: 190 h_errno = NO_RECOVERY; 191 return (NULL); /* XXX should be abort(); */ 192 } 193 /* 194 * find first satisfactory answer 195 */ 196 hp = &answer->hdr; 197 ancount = ntohs(hp->ancount); 198 qdcount = ntohs(hp->qdcount); 199 bp = hostbuf; 200 ep = hostbuf + sizeof hostbuf; 201 cp = answer->buf; 202 BOUNDED_INCR(HFIXEDSZ); 203 if (qdcount != 1) { 204 h_errno = NO_RECOVERY; 205 return (NULL); 206 } 207 n = dn_expand(answer->buf, eom, cp, bp, ep - bp); 208 if ((n < 0) || !(*name_ok)(bp)) { 209 h_errno = NO_RECOVERY; 210 return (NULL); 211 } 212 BOUNDED_INCR(n + QFIXEDSZ); 213 if (qtype == T_A || qtype == T_AAAA) { 214 /* res_send() has already verified that the query name is the 215 * same as the one we sent; this just gets the expanded name 216 * (i.e., with the succeeding search-domain tacked on). 217 */ 218 n = strlen(bp) + 1; /* for the \0 */ 219 if (n >= MAXHOSTNAMELEN) { 220 h_errno = NO_RECOVERY; 221 return (NULL); 222 } 223 host.h_name = bp; 224 bp += n; 225 /* The qname can be abbreviated, but h_name is now absolute. */ 226 qname = host.h_name; 227 } 228 ap = host_aliases; 229 *ap = NULL; 230 host.h_aliases = host_aliases; 231 hap = h_addr_ptrs; 232 *hap = NULL; 233 host.h_addr_list = h_addr_ptrs; 234 haveanswer = 0; 235 had_error = 0; 236 _dns_ttl_ = -1; 237 while (ancount-- > 0 && cp < eom && !had_error) { 238 n = dn_expand(answer->buf, eom, cp, bp, ep - bp); 239 if ((n < 0) || !(*name_ok)(bp)) { 240 had_error++; 241 continue; 242 } 243 cp += n; /* name */ 244 BOUNDS_CHECK(cp, 3 * INT16SZ + INT32SZ); 245 type = _getshort(cp); 246 cp += INT16SZ; /* type */ 247 class = _getshort(cp); 248 cp += INT16SZ; /* class */ 249 if (qtype == T_A && type == T_A) 250 _dns_ttl_ = _getlong(cp); 251 cp += INT32SZ; /* TTL */ 252 n = _getshort(cp); 253 cp += INT16SZ; /* len */ 254 BOUNDS_CHECK(cp, n); 255 erdata = cp + n; 256 if (class != C_IN) { 257 /* XXX - debug? syslog? */ 258 cp += n; 259 continue; /* XXX - had_error++ ? */ 260 } 261 if ((qtype == T_A || qtype == T_AAAA) && type == T_CNAME) { 262 if (ap >= &host_aliases[MAXALIASES-1]) 263 continue; 264 n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf); 265 if ((n < 0) || !(*name_ok)(tbuf)) { 266 had_error++; 267 continue; 268 } 269 cp += n; 270 if (cp != erdata) { 271 h_errno = NO_RECOVERY; 272 return (NULL); 273 } 274 /* Store alias. */ 275 *ap++ = bp; 276 n = strlen(bp) + 1; /* for the \0 */ 277 if (n >= MAXHOSTNAMELEN) { 278 had_error++; 279 continue; 280 } 281 bp += n; 282 /* Get canonical name. */ 283 n = strlen(tbuf) + 1; /* for the \0 */ 284 if (n > ep - bp || n >= MAXHOSTNAMELEN) { 285 had_error++; 286 continue; 287 } 288 strcpy(bp, tbuf); 289 host.h_name = bp; 290 bp += n; 291 continue; 292 } 293 if (qtype == T_PTR && type == T_CNAME) { 294 n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf); 295 if (n < 0 || !res_dnok(tbuf)) { 296 had_error++; 297 continue; 298 } 299 cp += n; 300 if (cp != erdata) { 301 h_errno = NO_RECOVERY; 302 return (NULL); 303 } 304 /* Get canonical name. */ 305 n = strlen(tbuf) + 1; /* for the \0 */ 306 if (n > ep - bp || n >= MAXHOSTNAMELEN) { 307 had_error++; 308 continue; 309 } 310 strcpy(bp, tbuf); 311 tname = bp; 312 bp += n; 313 continue; 314 } 315 if (type != qtype) { 316 if (type != T_SIG) 317 syslog(LOG_NOTICE|LOG_AUTH, 318 "gethostby*.gethostanswer: asked for \"%s %s %s\", got type \"%s\"", 319 qname, p_class(C_IN), p_type(qtype), 320 p_type(type)); 321 cp += n; 322 continue; /* XXX - had_error++ ? */ 323 } 324 switch (type) { 325 case T_PTR: 326 if (strcasecmp(tname, bp) != 0) { 327 syslog(LOG_NOTICE|LOG_AUTH, 328 AskedForGot, qname, bp); 329 cp += n; 330 continue; /* XXX - had_error++ ? */ 331 } 332 n = dn_expand(answer->buf, eom, cp, bp, ep - bp); 333 if ((n < 0) || !res_hnok(bp)) { 334 had_error++; 335 break; 336 } 337 #if MULTI_PTRS_ARE_ALIASES 338 cp += n; 339 if (cp != erdata) { 340 h_errno = NO_RECOVERY; 341 return (NULL); 342 } 343 if (!haveanswer) 344 host.h_name = bp; 345 else if (ap < &host_aliases[MAXALIASES-1]) 346 *ap++ = bp; 347 else 348 n = -1; 349 if (n != -1) { 350 n = strlen(bp) + 1; /* for the \0 */ 351 if (n >= MAXHOSTNAMELEN) { 352 had_error++; 353 break; 354 } 355 bp += n; 356 } 357 break; 358 #else 359 host.h_name = bp; 360 if (_res.options & RES_USE_INET6) { 361 n = strlen(bp) + 1; /* for the \0 */ 362 if (n >= MAXHOSTNAMELEN) { 363 had_error++; 364 break; 365 } 366 bp += n; 367 _map_v4v6_hostent(&host, &bp, &ep); 368 } 369 h_errno = NETDB_SUCCESS; 370 return (&host); 371 #endif 372 case T_A: 373 case T_AAAA: 374 if (strcasecmp(host.h_name, bp) != 0) { 375 syslog(LOG_NOTICE|LOG_AUTH, 376 AskedForGot, host.h_name, bp); 377 cp += n; 378 continue; /* XXX - had_error++ ? */ 379 } 380 if (n != host.h_length) { 381 cp += n; 382 continue; 383 } 384 if (!haveanswer) { 385 int nn; 386 387 host.h_name = bp; 388 nn = strlen(bp) + 1; /* for the \0 */ 389 bp += nn; 390 } 391 392 bp += sizeof(align) - ((u_long)bp % sizeof(align)); 393 394 if (bp + n >= ep) { 395 dprintf("size (%d) too big\n", n); 396 had_error++; 397 continue; 398 } 399 if (hap >= &h_addr_ptrs[MAXADDRS-1]) { 400 if (!toobig++) 401 dprintf("Too many addresses (%d)\n", 402 MAXADDRS); 403 cp += n; 404 continue; 405 } 406 bcopy(cp, *hap++ = bp, n); 407 bp += n; 408 cp += n; 409 if (cp != erdata) { 410 h_errno = NO_RECOVERY; 411 return (NULL); 412 } 413 break; 414 default: 415 dprintf("Impossible condition (type=%d)\n", type); 416 h_errno = NO_RECOVERY; 417 return (NULL); 418 /* BIND has abort() here, too risky on bad data */ 419 } 420 if (!had_error) 421 haveanswer++; 422 } 423 if (haveanswer) { 424 *ap = NULL; 425 *hap = NULL; 426 # if defined(RESOLVSORT) 427 /* 428 * Note: we sort even if host can take only one address 429 * in its return structures - should give it the "best" 430 * address in that case, not some random one 431 */ 432 if (_res.nsort && haveanswer > 1 && qtype == T_A) 433 addrsort(h_addr_ptrs, haveanswer); 434 # endif /*RESOLVSORT*/ 435 if (!host.h_name) { 436 n = strlen(qname) + 1; /* for the \0 */ 437 if (n > ep - bp || n >= MAXHOSTNAMELEN) 438 goto no_recovery; 439 strcpy(bp, qname); 440 host.h_name = bp; 441 bp += n; 442 } 443 if (_res.options & RES_USE_INET6) 444 _map_v4v6_hostent(&host, &bp, &ep); 445 h_errno = NETDB_SUCCESS; 446 return (&host); 447 } 448 no_recovery: 449 h_errno = NO_RECOVERY; 450 return (NULL); 451 } 452 453 struct hostent * 454 __dns_getanswer(answer, anslen, qname, qtype) 455 const char *answer; 456 int anslen; 457 const char *qname; 458 int qtype; 459 { 460 switch(qtype) { 461 case T_AAAA: 462 host.h_addrtype = AF_INET6; 463 host.h_length = IN6ADDRSZ; 464 break; 465 case T_A: 466 default: 467 host.h_addrtype = AF_INET; 468 host.h_length = INADDRSZ; 469 break; 470 } 471 472 return(gethostanswer((const querybuf *)answer, anslen, qname, qtype)); 473 } 474 475 int 476 _dns_gethostbyname(void *rval, void *cb_data, va_list ap) 477 { 478 const char *name; 479 int af; 480 querybuf buf; 481 const char *cp; 482 char *bp, *ep; 483 int n, size, type, len; 484 485 name = va_arg(ap, const char *); 486 af = va_arg(ap, int); 487 *(struct hostent **)rval = NULL; 488 489 if ((_res.options & RES_INIT) == 0 && res_init() == -1) { 490 h_errno = NETDB_INTERNAL; 491 return NS_UNAVAIL; 492 } 493 494 switch (af) { 495 case AF_INET: 496 size = INADDRSZ; 497 type = T_A; 498 break; 499 case AF_INET6: 500 size = IN6ADDRSZ; 501 type = T_AAAA; 502 break; 503 default: 504 h_errno = NETDB_INTERNAL; 505 errno = EAFNOSUPPORT; 506 return NS_UNAVAIL; 507 } 508 509 host.h_addrtype = af; 510 host.h_length = size; 511 512 /* 513 * if there aren't any dots, it could be a user-level alias. 514 * this is also done in res_query() since we are not the only 515 * function that looks up host names. 516 */ 517 if (!strchr(name, '.') && (cp = __hostalias(name))) 518 name = cp; 519 520 /* 521 * disallow names consisting only of digits/dots, unless 522 * they end in a dot. 523 */ 524 if (isdigit((unsigned char)name[0])) 525 for (cp = name;; ++cp) { 526 if (!*cp) { 527 if (*--cp == '.') 528 break; 529 /* 530 * All-numeric, no dot at the end. 531 * Fake up a hostent as if we'd actually 532 * done a lookup. 533 */ 534 if (inet_pton(af, name, host_addr) <= 0) { 535 h_errno = HOST_NOT_FOUND; 536 return NS_NOTFOUND; 537 } 538 strncpy(hostbuf, name, MAXDNAME); 539 hostbuf[MAXDNAME] = '\0'; 540 bp = hostbuf + MAXDNAME; 541 ep = hostbuf + sizeof hostbuf; 542 host.h_name = hostbuf; 543 host.h_aliases = host_aliases; 544 host_aliases[0] = NULL; 545 h_addr_ptrs[0] = (char *)host_addr; 546 h_addr_ptrs[1] = NULL; 547 host.h_addr_list = h_addr_ptrs; 548 if (_res.options & RES_USE_INET6) 549 _map_v4v6_hostent(&host, &bp, &ep); 550 h_errno = NETDB_SUCCESS; 551 *(struct hostent **)rval = &host; 552 return NS_SUCCESS; 553 } 554 if (!isdigit((unsigned char)*cp) && *cp != '.') 555 break; 556 } 557 if ((isxdigit((unsigned char)name[0]) && strchr(name, ':') != NULL) || 558 name[0] == ':') 559 for (cp = name;; ++cp) { 560 if (!*cp) { 561 if (*--cp == '.') 562 break; 563 /* 564 * All-IPv6-legal, no dot at the end. 565 * Fake up a hostent as if we'd actually 566 * done a lookup. 567 */ 568 if (inet_pton(af, name, host_addr) <= 0) { 569 h_errno = HOST_NOT_FOUND; 570 return NS_NOTFOUND; 571 } 572 strncpy(hostbuf, name, MAXDNAME); 573 hostbuf[MAXDNAME] = '\0'; 574 bp = hostbuf + MAXDNAME; 575 len = sizeof hostbuf - MAXDNAME; 576 host.h_name = hostbuf; 577 host.h_aliases = host_aliases; 578 host_aliases[0] = NULL; 579 h_addr_ptrs[0] = (char *)host_addr; 580 h_addr_ptrs[1] = NULL; 581 host.h_addr_list = h_addr_ptrs; 582 h_errno = NETDB_SUCCESS; 583 *(struct hostent **)rval = &host; 584 return NS_SUCCESS; 585 } 586 if (!isxdigit((unsigned char)*cp) && *cp != ':' && *cp != '.') 587 break; 588 } 589 590 if ((n = res_search(name, C_IN, type, buf.buf, sizeof(buf))) < 0) { 591 dprintf("res_search failed (%d)\n", n); 592 return NS_UNAVAIL; 593 } 594 *(struct hostent **)rval = gethostanswer(&buf, n, name, type); 595 return (*(struct hostent **)rval != NULL) ? NS_SUCCESS : NS_NOTFOUND; 596 } 597 598 int 599 _dns_gethostbyaddr(void *rval, void *cb_data, va_list ap) 600 { 601 const char *addr; /* XXX should have been def'd as u_char! */ 602 int len, af; 603 const u_char *uaddr; 604 static const u_char mapped[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0xff,0xff }; 605 static const u_char tunnelled[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0,0 }; 606 int n, size; 607 querybuf buf; 608 struct hostent *hp; 609 char qbuf[MAXDNAME+1], *qp; 610 #ifdef SUNSECURITY 611 struct hostent *rhp; 612 char **haddr; 613 u_long old_options; 614 char hname2[MAXDNAME+1]; 615 #endif /*SUNSECURITY*/ 616 617 addr = va_arg(ap, const char *); 618 uaddr = (const u_char *)addr; 619 len = va_arg(ap, int); 620 af = va_arg(ap, int); 621 622 *(struct hostent **)rval = NULL; 623 624 if ((_res.options & RES_INIT) == 0 && res_init() == -1) { 625 h_errno = NETDB_INTERNAL; 626 return NS_UNAVAIL; 627 } 628 if (af == AF_INET6 && len == IN6ADDRSZ && 629 (!bcmp(uaddr, mapped, sizeof mapped) || 630 !bcmp(uaddr, tunnelled, sizeof tunnelled))) { 631 /* Unmap. */ 632 addr += sizeof mapped; 633 uaddr += sizeof mapped; 634 af = AF_INET; 635 len = INADDRSZ; 636 } 637 switch (af) { 638 case AF_INET: 639 size = INADDRSZ; 640 break; 641 case AF_INET6: 642 size = IN6ADDRSZ; 643 break; 644 default: 645 errno = EAFNOSUPPORT; 646 h_errno = NETDB_INTERNAL; 647 return NS_UNAVAIL; 648 } 649 if (size != len) { 650 errno = EINVAL; 651 h_errno = NETDB_INTERNAL; 652 return NS_UNAVAIL; 653 } 654 switch (af) { 655 case AF_INET: 656 (void) sprintf(qbuf, "%u.%u.%u.%u.in-addr.arpa", 657 (uaddr[3] & 0xff), 658 (uaddr[2] & 0xff), 659 (uaddr[1] & 0xff), 660 (uaddr[0] & 0xff)); 661 break; 662 case AF_INET6: 663 qp = qbuf; 664 for (n = IN6ADDRSZ - 1; n >= 0; n--) { 665 qp += SPRINTF((qp, "%x.%x.", 666 uaddr[n] & 0xf, 667 (uaddr[n] >> 4) & 0xf)); 668 } 669 strcpy(qp, "ip6.int"); 670 break; 671 default: 672 abort(); 673 } 674 n = res_query(qbuf, C_IN, T_PTR, (u_char *)buf.buf, sizeof buf.buf); 675 if (n < 0) { 676 dprintf("res_query failed (%d)\n", n); 677 return NS_UNAVAIL; 678 } 679 if (n > sizeof buf.buf) { 680 dprintf("static buffer is too small (%d)\n", n); 681 return NS_UNAVAIL; 682 } 683 if (!(hp = gethostanswer(&buf, n, qbuf, T_PTR))) 684 return NS_NOTFOUND; /* h_errno was set by gethostanswer() */ 685 #ifdef SUNSECURITY 686 if (af == AF_INET) { 687 /* 688 * turn off search as the name should be absolute, 689 * 'localhost' should be matched by defnames 690 */ 691 strncpy(hname2, hp->h_name, MAXDNAME); 692 hname2[MAXDNAME] = '\0'; 693 old_options = _res.options; 694 _res.options &= ~RES_DNSRCH; 695 _res.options |= RES_DEFNAMES; 696 if (!(rhp = gethostbyname(hname2))) { 697 syslog(LOG_NOTICE|LOG_AUTH, 698 "gethostbyaddr: No A record for %s (verifying [%s])", 699 hname2, inet_ntoa(*((struct in_addr *)addr))); 700 _res.options = old_options; 701 h_errno = HOST_NOT_FOUND; 702 return NS_NOTFOUND; 703 } 704 _res.options = old_options; 705 for (haddr = rhp->h_addr_list; *haddr; haddr++) 706 if (!memcmp(*haddr, addr, INADDRSZ)) 707 break; 708 if (!*haddr) { 709 syslog(LOG_NOTICE|LOG_AUTH, 710 "gethostbyaddr: A record of %s != PTR record [%s]", 711 hname2, inet_ntoa(*((struct in_addr *)addr))); 712 h_errno = HOST_NOT_FOUND; 713 return NS_NOTFOUND; 714 } 715 } 716 #endif /*SUNSECURITY*/ 717 hp->h_addrtype = af; 718 hp->h_length = len; 719 bcopy(addr, host_addr, len); 720 h_addr_ptrs[0] = (char *)host_addr; 721 h_addr_ptrs[1] = NULL; 722 if (af == AF_INET && (_res.options & RES_USE_INET6)) { 723 _map_v4v6_address((char*)host_addr, (char*)host_addr); 724 hp->h_addrtype = AF_INET6; 725 hp->h_length = IN6ADDRSZ; 726 } 727 h_errno = NETDB_SUCCESS; 728 *(struct hostent **)rval = hp; 729 return (hp != NULL) ? NS_SUCCESS : NS_NOTFOUND; 730 } 731 732 #ifdef RESOLVSORT 733 static void 734 addrsort(ap, num) 735 char **ap; 736 int num; 737 { 738 int i, j; 739 char **p; 740 short aval[MAXADDRS]; 741 int needsort = 0; 742 743 p = ap; 744 for (i = 0; i < num; i++, p++) { 745 for (j = 0 ; (unsigned)j < _res.nsort; j++) 746 if (_res.sort_list[j].addr.s_addr == 747 (((struct in_addr *)(*p))->s_addr & _res.sort_list[j].mask)) 748 break; 749 aval[i] = j; 750 if (needsort == 0 && i > 0 && j < aval[i-1]) 751 needsort = i; 752 } 753 if (!needsort) 754 return; 755 756 while (needsort < num) { 757 for (j = needsort - 1; j >= 0; j--) { 758 if (aval[j] > aval[j+1]) { 759 char *hp; 760 761 i = aval[j]; 762 aval[j] = aval[j+1]; 763 aval[j+1] = i; 764 765 hp = ap[j]; 766 ap[j] = ap[j+1]; 767 ap[j+1] = hp; 768 769 } else 770 break; 771 } 772 needsort++; 773 } 774 } 775 #endif 776 void 777 _sethostdnsent(stayopen) 778 int stayopen; 779 { 780 if ((_res.options & RES_INIT) == 0 && res_init() == -1) 781 return; 782 if (stayopen) 783 _res.options |= RES_STAYOPEN | RES_USEVC; 784 } 785 786 void 787 _endhostdnsent() 788 { 789 _res.options &= ~(RES_STAYOPEN | RES_USEVC); 790 res_close(); 791 } 792