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 $"; 59 static char rcsid[] = "$Id: gethostbydns.c,v 1.22 1997/06/27 08:22:01 peter Exp $"; 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 syslog(LOG_NOTICE|LOG_AUTH, 314 "gethostby*.gethostanswer: asked for \"%s %s %s\", got type \"%s\"", 315 qname, p_class(C_IN), p_type(qtype), 316 p_type(type)); 317 cp += n; 318 continue; /* XXX - had_error++ ? */ 319 } 320 switch (type) { 321 case T_PTR: 322 if (strcasecmp(tname, bp) != 0) { 323 syslog(LOG_NOTICE|LOG_AUTH, 324 AskedForGot, qname, bp); 325 cp += n; 326 continue; /* XXX - had_error++ ? */ 327 } 328 n = dn_expand(answer->buf, eom, cp, bp, buflen); 329 if ((n < 0) || !res_hnok(bp)) { 330 had_error++; 331 break; 332 } 333 #if MULTI_PTRS_ARE_ALIASES 334 cp += n; 335 if (cp != erdata) { 336 h_errno = NO_RECOVERY; 337 return (NULL); 338 } 339 if (!haveanswer) 340 host.h_name = bp; 341 else if (ap < &host_aliases[MAXALIASES-1]) 342 *ap++ = bp; 343 else 344 n = -1; 345 if (n != -1) { 346 n = strlen(bp) + 1; /* for the \0 */ 347 if (n >= MAXHOSTNAMELEN) { 348 had_error++; 349 break; 350 } 351 bp += n; 352 buflen -= n; 353 } 354 break; 355 #else 356 host.h_name = bp; 357 if (_res.options & RES_USE_INET6) { 358 n = strlen(bp) + 1; /* for the \0 */ 359 if (n >= MAXHOSTNAMELEN) { 360 had_error++; 361 break; 362 } 363 bp += n; 364 buflen -= n; 365 _map_v4v6_hostent(&host, &bp, &buflen); 366 } 367 h_errno = NETDB_SUCCESS; 368 return (&host); 369 #endif 370 case T_A: 371 case T_AAAA: 372 if (strcasecmp(host.h_name, bp) != 0) { 373 syslog(LOG_NOTICE|LOG_AUTH, 374 AskedForGot, host.h_name, bp); 375 cp += n; 376 continue; /* XXX - had_error++ ? */ 377 } 378 if (n != host.h_length) { 379 cp += n; 380 continue; 381 } 382 if (!haveanswer) { 383 register int nn; 384 385 host.h_name = bp; 386 nn = strlen(bp) + 1; /* for the \0 */ 387 bp += nn; 388 buflen -= nn; 389 } 390 391 bp += sizeof(align) - ((u_long)bp % sizeof(align)); 392 393 if (bp + n >= &hostbuf[sizeof hostbuf]) { 394 dprintf("size (%d) too big\n", n); 395 had_error++; 396 continue; 397 } 398 if (hap >= &h_addr_ptrs[MAXADDRS-1]) { 399 if (!toobig++) 400 dprintf("Too many addresses (%d)\n", 401 MAXADDRS); 402 cp += n; 403 continue; 404 } 405 bcopy(cp, *hap++ = bp, n); 406 bp += n; 407 buflen -= 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 > buflen || n >= MAXHOSTNAMELEN) 438 goto no_recovery; 439 strcpy(bp, qname); 440 host.h_name = bp; 441 bp += n; 442 buflen -= n; 443 } 444 if (_res.options & RES_USE_INET6) 445 _map_v4v6_hostent(&host, &bp, &buflen); 446 h_errno = NETDB_SUCCESS; 447 return (&host); 448 } 449 no_recovery: 450 h_errno = NO_RECOVERY; 451 return (NULL); 452 } 453 454 struct hostent * 455 __dns_getanswer(answer, anslen, qname, qtype) 456 const char *answer; 457 int anslen; 458 const char *qname; 459 int qtype; 460 { 461 switch(qtype) { 462 case T_AAAA: 463 host.h_addrtype = AF_INET6; 464 host.h_length = IN6ADDRSZ; 465 break; 466 case T_A: 467 default: 468 host.h_addrtype = AF_INET; 469 host.h_length = INADDRSZ; 470 break; 471 } 472 473 return(gethostanswer((const querybuf *)answer, anslen, qname, qtype)); 474 } 475 476 struct hostent * 477 _gethostbydnsname(name, af) 478 const char *name; 479 int af; 480 { 481 querybuf buf; 482 register const char *cp; 483 char *bp; 484 int n, size, type, len; 485 486 if ((_res.options & RES_INIT) == 0 && res_init() == -1) { 487 h_errno = NETDB_INTERNAL; 488 return (NULL); 489 } 490 491 switch (af) { 492 case AF_INET: 493 size = INADDRSZ; 494 type = T_A; 495 break; 496 case AF_INET6: 497 size = IN6ADDRSZ; 498 type = T_AAAA; 499 break; 500 default: 501 h_errno = NETDB_INTERNAL; 502 errno = EAFNOSUPPORT; 503 return (NULL); 504 } 505 506 host.h_addrtype = af; 507 host.h_length = size; 508 509 /* 510 * if there aren't any dots, it could be a user-level alias. 511 * this is also done in res_query() since we are not the only 512 * function that looks up host names. 513 */ 514 if (!strchr(name, '.') && (cp = __hostalias(name))) 515 name = cp; 516 517 /* 518 * disallow names consisting only of digits/dots, unless 519 * they end in a dot. 520 */ 521 if (isdigit(name[0])) 522 for (cp = name;; ++cp) { 523 if (!*cp) { 524 if (*--cp == '.') 525 break; 526 /* 527 * All-numeric, no dot at the end. 528 * Fake up a hostent as if we'd actually 529 * done a lookup. 530 */ 531 if (inet_pton(af, name, host_addr) <= 0) { 532 h_errno = HOST_NOT_FOUND; 533 return (NULL); 534 } 535 strncpy(hostbuf, name, MAXDNAME); 536 hostbuf[MAXDNAME] = '\0'; 537 bp = hostbuf + MAXDNAME; 538 len = sizeof hostbuf - MAXDNAME; 539 host.h_name = hostbuf; 540 host.h_aliases = host_aliases; 541 host_aliases[0] = NULL; 542 h_addr_ptrs[0] = (char *)host_addr; 543 h_addr_ptrs[1] = NULL; 544 host.h_addr_list = h_addr_ptrs; 545 if (_res.options & RES_USE_INET6) 546 _map_v4v6_hostent(&host, &bp, &len); 547 h_errno = NETDB_SUCCESS; 548 return (&host); 549 } 550 if (!isdigit(*cp) && *cp != '.') 551 break; 552 } 553 if ((isxdigit(name[0]) && strchr(name, ':') != NULL) || 554 name[0] == ':') 555 for (cp = name;; ++cp) { 556 if (!*cp) { 557 if (*--cp == '.') 558 break; 559 /* 560 * All-IPv6-legal, no dot at the end. 561 * Fake up a hostent as if we'd actually 562 * done a lookup. 563 */ 564 if (inet_pton(af, name, host_addr) <= 0) { 565 h_errno = HOST_NOT_FOUND; 566 return (NULL); 567 } 568 strncpy(hostbuf, name, MAXDNAME); 569 hostbuf[MAXDNAME] = '\0'; 570 bp = hostbuf + MAXDNAME; 571 len = sizeof hostbuf - MAXDNAME; 572 host.h_name = hostbuf; 573 host.h_aliases = host_aliases; 574 host_aliases[0] = NULL; 575 h_addr_ptrs[0] = (char *)host_addr; 576 h_addr_ptrs[1] = NULL; 577 host.h_addr_list = h_addr_ptrs; 578 h_errno = NETDB_SUCCESS; 579 return (&host); 580 } 581 if (!isxdigit(*cp) && *cp != ':' && *cp != '.') 582 break; 583 } 584 585 if ((n = res_search(name, C_IN, type, buf.buf, sizeof(buf))) < 0) { 586 dprintf("res_search failed (%d)\n", n); 587 return (NULL); 588 } 589 return (gethostanswer(&buf, n, name, type)); 590 } 591 592 struct hostent * 593 _gethostbydnsaddr(addr, len, af) 594 const char *addr; /* XXX should have been def'd as u_char! */ 595 int len, af; 596 { 597 const u_char *uaddr = (const u_char *)addr; 598 static const u_char mapped[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0xff,0xff }; 599 static const u_char tunnelled[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0,0 }; 600 int n, size; 601 querybuf buf; 602 register struct hostent *hp; 603 char qbuf[MAXDNAME+1], *qp; 604 #ifdef SUNSECURITY 605 register struct hostent *rhp; 606 char **haddr; 607 u_long old_options; 608 char hname2[MAXDNAME+1]; 609 #endif /*SUNSECURITY*/ 610 611 if ((_res.options & RES_INIT) == 0 && res_init() == -1) { 612 h_errno = NETDB_INTERNAL; 613 return (NULL); 614 } 615 if (af == AF_INET6 && len == IN6ADDRSZ && 616 (!bcmp(uaddr, mapped, sizeof mapped) || 617 !bcmp(uaddr, tunnelled, sizeof tunnelled))) { 618 /* Unmap. */ 619 addr += sizeof mapped; 620 uaddr += sizeof mapped; 621 af = AF_INET; 622 len = INADDRSZ; 623 } 624 switch (af) { 625 case AF_INET: 626 size = INADDRSZ; 627 break; 628 case AF_INET6: 629 size = IN6ADDRSZ; 630 break; 631 default: 632 errno = EAFNOSUPPORT; 633 h_errno = NETDB_INTERNAL; 634 return (NULL); 635 } 636 if (size != len) { 637 errno = EINVAL; 638 h_errno = NETDB_INTERNAL; 639 return (NULL); 640 } 641 switch (af) { 642 case AF_INET: 643 (void) sprintf(qbuf, "%u.%u.%u.%u.in-addr.arpa", 644 (uaddr[3] & 0xff), 645 (uaddr[2] & 0xff), 646 (uaddr[1] & 0xff), 647 (uaddr[0] & 0xff)); 648 break; 649 case AF_INET6: 650 qp = qbuf; 651 for (n = IN6ADDRSZ - 1; n >= 0; n--) { 652 qp += SPRINTF((qp, "%x.%x.", 653 uaddr[n] & 0xf, 654 (uaddr[n] >> 4) & 0xf)); 655 } 656 strcpy(qp, "ip6.int"); 657 break; 658 default: 659 abort(); 660 } 661 n = res_query(qbuf, C_IN, T_PTR, (u_char *)buf.buf, sizeof buf.buf); 662 if (n < 0) { 663 dprintf("res_query failed (%d)\n", n); 664 return (NULL); 665 } 666 if (!(hp = gethostanswer(&buf, n, qbuf, T_PTR))) 667 return (NULL); /* h_errno was set by gethostanswer() */ 668 #ifdef SUNSECURITY 669 if (af == AF_INET) { 670 /* 671 * turn off search as the name should be absolute, 672 * 'localhost' should be matched by defnames 673 */ 674 strncpy(hname2, hp->h_name, MAXDNAME); 675 hname2[MAXDNAME] = '\0'; 676 old_options = _res.options; 677 _res.options &= ~RES_DNSRCH; 678 _res.options |= RES_DEFNAMES; 679 if (!(rhp = gethostbyname(hname2))) { 680 syslog(LOG_NOTICE|LOG_AUTH, 681 "gethostbyaddr: No A record for %s (verifying [%s])", 682 hname2, inet_ntoa(*((struct in_addr *)addr))); 683 _res.options = old_options; 684 h_errno = HOST_NOT_FOUND; 685 return (NULL); 686 } 687 _res.options = old_options; 688 for (haddr = rhp->h_addr_list; *haddr; haddr++) 689 if (!memcmp(*haddr, addr, INADDRSZ)) 690 break; 691 if (!*haddr) { 692 syslog(LOG_NOTICE|LOG_AUTH, 693 "gethostbyaddr: A record of %s != PTR record [%s]", 694 hname2, inet_ntoa(*((struct in_addr *)addr))); 695 h_errno = HOST_NOT_FOUND; 696 return (NULL); 697 } 698 } 699 #endif /*SUNSECURITY*/ 700 hp->h_addrtype = af; 701 hp->h_length = len; 702 bcopy(addr, host_addr, len); 703 h_addr_ptrs[0] = (char *)host_addr; 704 h_addr_ptrs[1] = NULL; 705 if (af == AF_INET && (_res.options & RES_USE_INET6)) { 706 _map_v4v6_address((char*)host_addr, (char*)host_addr); 707 hp->h_addrtype = AF_INET6; 708 hp->h_length = IN6ADDRSZ; 709 } 710 h_errno = NETDB_SUCCESS; 711 return (hp); 712 } 713 714 #ifdef RESOLVSORT 715 static void 716 addrsort(ap, num) 717 char **ap; 718 int num; 719 { 720 int i, j; 721 char **p; 722 short aval[MAXADDRS]; 723 int needsort = 0; 724 725 p = ap; 726 for (i = 0; i < num; i++, p++) { 727 for (j = 0 ; (unsigned)j < _res.nsort; j++) 728 if (_res.sort_list[j].addr.s_addr == 729 (((struct in_addr *)(*p))->s_addr & _res.sort_list[j].mask)) 730 break; 731 aval[i] = j; 732 if (needsort == 0 && i > 0 && j < aval[i-1]) 733 needsort = i; 734 } 735 if (!needsort) 736 return; 737 738 while (needsort < num) { 739 for (j = needsort - 1; j >= 0; j--) { 740 if (aval[j] > aval[j+1]) { 741 char *hp; 742 743 i = aval[j]; 744 aval[j] = aval[j+1]; 745 aval[j+1] = i; 746 747 hp = ap[j]; 748 ap[j] = ap[j+1]; 749 ap[j+1] = hp; 750 751 } else 752 break; 753 } 754 needsort++; 755 } 756 } 757 #endif 758 void 759 _sethostdnsent(stayopen) 760 int stayopen; 761 { 762 if ((_res.options & RES_INIT) == 0 && res_init() == -1) 763 return; 764 if (stayopen) 765 _res.options |= RES_STAYOPEN | RES_USEVC; 766 } 767 768 void 769 _endhostdnsent() 770 { 771 _res.options &= ~(RES_STAYOPEN | RES_USEVC); 772 res_close(); 773 } 774