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