gethnamaddr.c revision 1.51
1 /* $NetBSD: gethnamaddr.c,v 1.51 2002/08/22 16:32:14 itojun Exp $ */ 2 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. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * - 37 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 38 * 39 * Permission to use, copy, modify, and distribute this software for any 40 * purpose with or without fee is hereby granted, provided that the above 41 * copyright notice and this permission notice appear in all copies, and that 42 * the name of Digital Equipment Corporation not be used in advertising or 43 * publicity pertaining to distribution of the document or software without 44 * specific, written prior permission. 45 * 46 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 47 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 48 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 49 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 50 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 51 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 52 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 53 * SOFTWARE. 54 * - 55 * --Copyright-- 56 */ 57 58 #include <sys/cdefs.h> 59 #if defined(LIBC_SCCS) && !defined(lint) 60 #if 0 61 static char sccsid[] = "@(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93"; 62 static char rcsid[] = "Id: gethnamaddr.c,v 8.21 1997/06/01 20:34:37 vixie Exp "; 63 #else 64 __RCSID("$NetBSD: gethnamaddr.c,v 1.51 2002/08/22 16:32:14 itojun Exp $"); 65 #endif 66 #endif /* LIBC_SCCS and not lint */ 67 68 #if defined(_LIBC) 69 #include "namespace.h" 70 #endif 71 #include <sys/param.h> 72 #include <sys/socket.h> 73 #include <netinet/in.h> 74 #include <arpa/inet.h> 75 #include <arpa/nameser.h> 76 77 #include <assert.h> 78 #include <ctype.h> 79 #include <errno.h> 80 #include <netdb.h> 81 #include <resolv.h> 82 #include <stdarg.h> 83 #include <stdio.h> 84 #include <syslog.h> 85 86 #ifndef LOG_AUTH 87 # define LOG_AUTH 0 88 #endif 89 90 #define MULTI_PTRS_ARE_ALIASES 1 /* XXX - experimental */ 91 92 #include <nsswitch.h> 93 #include <stdlib.h> 94 #include <string.h> 95 96 #ifdef YP 97 #include <rpc/rpc.h> 98 #include <rpcsvc/yp_prot.h> 99 #include <rpcsvc/ypclnt.h> 100 #endif 101 102 #if defined(_LIBC) && defined(__weak_alias) 103 __weak_alias(gethostbyaddr,_gethostbyaddr) 104 __weak_alias(gethostbyname,_gethostbyname) 105 #endif 106 107 #define MAXALIASES 35 108 #define MAXADDRS 35 109 110 static const char AskedForGot[] = 111 "gethostby*.getanswer: asked for \"%s\", got \"%s\""; 112 113 static char *h_addr_ptrs[MAXADDRS + 1]; 114 115 #ifdef YP 116 static char *__ypdomain; 117 #endif 118 119 static struct hostent host; 120 static char *host_aliases[MAXALIASES]; 121 static char hostbuf[8*1024]; 122 static u_int32_t host_addr[16 / sizeof(u_int32_t)]; /* IPv4 or IPv6 */ 123 static FILE *hostf = NULL; 124 static int stayopen = 0; 125 126 127 #if PACKETSZ > 1024 128 #define MAXPACKET PACKETSZ 129 #else 130 #define MAXPACKET 1024 131 #endif 132 133 typedef union { 134 HEADER hdr; 135 u_char buf[MAXPACKET]; 136 } querybuf; 137 138 typedef union { 139 int32_t al; 140 char ac; 141 } align; 142 143 #ifdef DEBUG 144 static void dprintf __P((char *, ...)) 145 __attribute__((__format__(__printf__, 1, 2))); 146 #endif 147 static struct hostent *getanswer __P((const querybuf *, int, 148 const char *, int)); 149 static void map_v4v6_address __P((const char *, char *)); 150 static void map_v4v6_hostent __P((struct hostent *, char **, char *)); 151 #ifdef RESOLVSORT 152 static void addrsort __P((char **, int)); 153 #endif 154 155 void _sethtent __P((int)); 156 void _endhtent __P((void)); 157 struct hostent *_gethtent __P((void)); 158 struct hostent *_gethtbyname2 __P((const char *, int)); 159 void ht_sethostent __P((int)); 160 void ht_endhostent __P((void)); 161 struct hostent *ht_gethostbyname __P((char *)); 162 struct hostent *ht_gethostbyaddr __P((const char *, int, int )); 163 void dns_service __P((void)); 164 #undef dn_skipname 165 int dn_skipname __P((const u_char *, const u_char *)); 166 int _gethtbyaddr __P((void *, void *, va_list)); 167 int _gethtbyname __P((void *, void *, va_list)); 168 int _dns_gethtbyaddr __P((void *, void *, va_list)); 169 int _dns_gethtbyname __P((void *, void *, va_list)); 170 #ifdef YP 171 struct hostent *_yphostent __P((char *, int)); 172 int _yp_gethtbyaddr __P((void *, void *, va_list)); 173 int _yp_gethtbyname __P((void *, void *, va_list)); 174 #endif 175 176 static const ns_src default_dns_files[] = { 177 { NSSRC_FILES, NS_SUCCESS }, 178 { NSSRC_DNS, NS_SUCCESS }, 179 { 0 } 180 }; 181 182 183 #ifdef DEBUG 184 static void 185 dprintf(char *msg, ...) 186 { 187 _DIAGASSERT(msg != NULL); 188 189 if (_res.options & RES_DEBUG) { 190 int save = errno; 191 va_list ap; 192 193 va_start (ap, msg); 194 vprintf(msg, ap); 195 va_end (ap); 196 197 errno = save; 198 } 199 } 200 #else 201 # define dprintf(msg, num) /*nada*/ 202 #endif 203 204 #define BOUNDED_INCR(x) \ 205 do { \ 206 cp += x; \ 207 if (cp > eom) { \ 208 h_errno = NO_RECOVERY; \ 209 return (NULL); \ 210 } \ 211 } while (/*CONSTCOND*/0) 212 213 #define BOUNDS_CHECK(ptr, count) \ 214 do { \ 215 if ((ptr) + (count) > eom) { \ 216 h_errno = NO_RECOVERY; \ 217 return (NULL); \ 218 } \ 219 } while (/*CONSTCOND*/0) 220 221 static struct hostent * 222 getanswer(answer, anslen, qname, qtype) 223 const querybuf *answer; 224 int anslen; 225 const char *qname; 226 int qtype; 227 { 228 const HEADER *hp; 229 const u_char *cp; 230 int n; 231 const u_char *eom, *erdata; 232 char *bp, **ap, **hap, *ep; 233 int type, class, ancount, qdcount; 234 int haveanswer, had_error; 235 int toobig = 0; 236 char tbuf[MAXDNAME]; 237 const char *tname; 238 int (*name_ok) __P((const char *)); 239 240 _DIAGASSERT(answer != NULL); 241 _DIAGASSERT(qname != NULL); 242 243 tname = qname; 244 host.h_name = NULL; 245 eom = answer->buf + anslen; 246 switch (qtype) { 247 case T_A: 248 case T_AAAA: 249 name_ok = res_hnok; 250 break; 251 case T_PTR: 252 name_ok = res_dnok; 253 break; 254 default: 255 return (NULL); /* XXX should be abort(); */ 256 } 257 /* 258 * find first satisfactory answer 259 */ 260 hp = &answer->hdr; 261 ancount = ntohs(hp->ancount); 262 qdcount = ntohs(hp->qdcount); 263 bp = hostbuf; 264 ep = hostbuf + sizeof hostbuf; 265 cp = answer->buf; 266 BOUNDED_INCR(HFIXEDSZ); 267 if (qdcount != 1) { 268 h_errno = NO_RECOVERY; 269 return (NULL); 270 } 271 n = dn_expand(answer->buf, eom, cp, bp, ep - bp); 272 if ((n < 0) || !(*name_ok)(bp)) { 273 h_errno = NO_RECOVERY; 274 return (NULL); 275 } 276 BOUNDED_INCR(n + QFIXEDSZ); 277 if (qtype == T_A || qtype == T_AAAA) { 278 /* res_send() has already verified that the query name is the 279 * same as the one we sent; this just gets the expanded name 280 * (i.e., with the succeeding search-domain tacked on). 281 */ 282 n = strlen(bp) + 1; /* for the \0 */ 283 if (n >= MAXHOSTNAMELEN) { 284 h_errno = NO_RECOVERY; 285 return (NULL); 286 } 287 host.h_name = bp; 288 bp += n; 289 /* The qname can be abbreviated, but h_name is now absolute. */ 290 qname = host.h_name; 291 } 292 ap = host_aliases; 293 *ap = NULL; 294 host.h_aliases = host_aliases; 295 hap = h_addr_ptrs; 296 *hap = NULL; 297 host.h_addr_list = h_addr_ptrs; 298 haveanswer = 0; 299 had_error = 0; 300 while (ancount-- > 0 && cp < eom && !had_error) { 301 n = dn_expand(answer->buf, eom, cp, bp, ep - bp); 302 if ((n < 0) || !(*name_ok)(bp)) { 303 had_error++; 304 continue; 305 } 306 cp += n; /* name */ 307 BOUNDS_CHECK(cp, 3 * INT16SZ + INT32SZ); 308 type = _getshort(cp); 309 cp += INT16SZ; /* type */ 310 class = _getshort(cp); 311 cp += INT16SZ + INT32SZ; /* class, TTL */ 312 n = _getshort(cp); 313 cp += INT16SZ; /* len */ 314 BOUNDS_CHECK(cp, n); 315 erdata = cp + n; 316 if (class != C_IN) { 317 /* XXX - debug? syslog? */ 318 cp += n; 319 continue; /* XXX - had_error++ ? */ 320 } 321 if ((qtype == T_A || qtype == T_AAAA) && type == T_CNAME) { 322 if (ap >= &host_aliases[MAXALIASES-1]) 323 continue; 324 n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf); 325 if ((n < 0) || !(*name_ok)(tbuf)) { 326 had_error++; 327 continue; 328 } 329 cp += n; 330 if (cp != erdata) { 331 h_errno = NO_RECOVERY; 332 return (NULL); 333 } 334 /* Store alias. */ 335 *ap++ = bp; 336 n = strlen(bp) + 1; /* for the \0 */ 337 if (n >= MAXHOSTNAMELEN) { 338 had_error++; 339 continue; 340 } 341 bp += n; 342 /* Get canonical name. */ 343 n = strlen(tbuf) + 1; /* for the \0 */ 344 if (n > ep - bp || n >= MAXHOSTNAMELEN) { 345 had_error++; 346 continue; 347 } 348 strcpy(bp, tbuf); 349 host.h_name = bp; 350 bp += n; 351 continue; 352 } 353 if (qtype == T_PTR && type == T_CNAME) { 354 n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf); 355 if (n < 0 || !res_dnok(tbuf)) { 356 had_error++; 357 continue; 358 } 359 cp += n; 360 if (cp != erdata) { 361 h_errno = NO_RECOVERY; 362 return (NULL); 363 } 364 /* Get canonical name. */ 365 n = strlen(tbuf) + 1; /* for the \0 */ 366 if (n > ep - bp || n >= MAXHOSTNAMELEN) { 367 had_error++; 368 continue; 369 } 370 strcpy(bp, tbuf); 371 tname = bp; 372 bp += n; 373 continue; 374 } 375 if (type != qtype) { 376 if (type != T_KEY && type != T_SIG) 377 syslog(LOG_NOTICE|LOG_AUTH, 378 "gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"", 379 qname, p_class(C_IN), p_type(qtype), 380 p_type(type)); 381 cp += n; 382 continue; /* XXX - had_error++ ? */ 383 } 384 switch (type) { 385 case T_PTR: 386 if (strcasecmp(tname, bp) != 0) { 387 syslog(LOG_NOTICE|LOG_AUTH, 388 AskedForGot, qname, bp); 389 cp += n; 390 continue; /* XXX - had_error++ ? */ 391 } 392 n = dn_expand(answer->buf, eom, cp, bp, ep - bp); 393 if ((n < 0) || !res_hnok(bp)) { 394 had_error++; 395 break; 396 } 397 #if MULTI_PTRS_ARE_ALIASES 398 cp += n; 399 if (cp != erdata) { 400 h_errno = NO_RECOVERY; 401 return (NULL); 402 } 403 if (!haveanswer) 404 host.h_name = bp; 405 else if (ap < &host_aliases[MAXALIASES-1]) 406 *ap++ = bp; 407 else 408 n = -1; 409 if (n != -1) { 410 n = strlen(bp) + 1; /* for the \0 */ 411 if (n >= MAXHOSTNAMELEN) { 412 had_error++; 413 break; 414 } 415 bp += n; 416 } 417 break; 418 #else 419 host.h_name = bp; 420 if (_res.options & RES_USE_INET6) { 421 n = strlen(bp) + 1; /* for the \0 */ 422 if (n >= MAXHOSTNAMELEN) { 423 had_error++; 424 break; 425 } 426 bp += n; 427 map_v4v6_hostent(&host, &bp, ep); 428 } 429 h_errno = NETDB_SUCCESS; 430 return (&host); 431 #endif 432 case T_A: 433 case T_AAAA: 434 if (strcasecmp(host.h_name, bp) != 0) { 435 syslog(LOG_NOTICE|LOG_AUTH, 436 AskedForGot, host.h_name, bp); 437 cp += n; 438 continue; /* XXX - had_error++ ? */ 439 } 440 if (n != host.h_length) { 441 cp += n; 442 continue; 443 } 444 if (type == T_AAAA) { 445 struct in6_addr in6; 446 memcpy(&in6, cp, IN6ADDRSZ); 447 if (IN6_IS_ADDR_V4MAPPED(&in6)) { 448 cp += n; 449 continue; 450 } 451 } 452 if (!haveanswer) { 453 int nn; 454 455 host.h_name = bp; 456 nn = strlen(bp) + 1; /* for the \0 */ 457 bp += nn; 458 } 459 460 bp += sizeof(align) - 461 (size_t)((u_long)bp % sizeof(align)); 462 463 if (bp + n >= &hostbuf[sizeof hostbuf]) { 464 dprintf("size (%d) too big\n", n); 465 had_error++; 466 continue; 467 } 468 if (hap >= &h_addr_ptrs[MAXADDRS-1]) { 469 if (!toobig++) 470 dprintf("Too many addresses (%d)\n", 471 MAXADDRS); 472 cp += n; 473 continue; 474 } 475 (void)memcpy(*hap++ = bp, cp, (size_t)n); 476 bp += n; 477 cp += n; 478 if (cp != erdata) { 479 h_errno = NO_RECOVERY; 480 return (NULL); 481 } 482 break; 483 default: 484 abort(); 485 } 486 if (!had_error) 487 haveanswer++; 488 } 489 if (haveanswer) { 490 *ap = NULL; 491 *hap = NULL; 492 # if defined(RESOLVSORT) 493 /* 494 * Note: we sort even if host can take only one address 495 * in its return structures - should give it the "best" 496 * address in that case, not some random one 497 */ 498 if (_res.nsort && haveanswer > 1 && qtype == T_A) 499 addrsort(h_addr_ptrs, haveanswer); 500 # endif /*RESOLVSORT*/ 501 if (!host.h_name) { 502 n = strlen(qname) + 1; /* for the \0 */ 503 if (n > ep - bp || n >= MAXHOSTNAMELEN) 504 goto no_recovery; 505 strcpy(bp, qname); 506 host.h_name = bp; 507 bp += n; 508 } 509 if (_res.options & RES_USE_INET6) 510 map_v4v6_hostent(&host, &bp, ep); 511 h_errno = NETDB_SUCCESS; 512 return (&host); 513 } 514 no_recovery: 515 h_errno = NO_RECOVERY; 516 return (NULL); 517 } 518 519 struct hostent * 520 gethostbyname(name) 521 const char *name; 522 { 523 struct hostent *hp; 524 525 _DIAGASSERT(name != NULL); 526 527 if ((_res.options & RES_INIT) == 0 && res_init() == -1) { 528 h_errno = NETDB_INTERNAL; 529 return (NULL); 530 } 531 if (_res.options & RES_USE_INET6) { 532 hp = gethostbyname2(name, AF_INET6); 533 if (hp) 534 return (hp); 535 } 536 return (gethostbyname2(name, AF_INET)); 537 } 538 539 struct hostent * 540 gethostbyname2(name, af) 541 const char *name; 542 int af; 543 { 544 const char *cp; 545 char *bp, *ep; 546 int size; 547 struct hostent *hp; 548 static const ns_dtab dtab[] = { 549 NS_FILES_CB(_gethtbyname, NULL) 550 { NSSRC_DNS, _dns_gethtbyname, NULL }, /* force -DHESIOD */ 551 NS_NIS_CB(_yp_gethtbyname, NULL) 552 { 0 } 553 }; 554 555 _DIAGASSERT(name != NULL); 556 557 switch (af) { 558 case AF_INET: 559 size = INADDRSZ; 560 break; 561 case AF_INET6: 562 size = IN6ADDRSZ; 563 break; 564 default: 565 h_errno = NETDB_INTERNAL; 566 errno = EAFNOSUPPORT; 567 return (NULL); 568 } 569 570 host.h_addrtype = af; 571 host.h_length = size; 572 573 /* 574 * if there aren't any dots, it could be a user-level alias. 575 * this is also done in res_query() since we are not the only 576 * function that looks up host names. 577 */ 578 if (!strchr(name, '.') && (cp = __hostalias(name))) 579 name = cp; 580 581 /* 582 * disallow names consisting only of digits/dots, unless 583 * they end in a dot. 584 */ 585 if (isdigit((u_char) name[0])) 586 for (cp = name;; ++cp) { 587 if (!*cp) { 588 if (*--cp == '.') 589 break; 590 /* 591 * All-numeric, no dot at the end. 592 * Fake up a hostent as if we'd actually 593 * done a lookup. 594 */ 595 if (inet_pton(af, name, 596 (char *)(void *)host_addr) <= 0) { 597 h_errno = HOST_NOT_FOUND; 598 return (NULL); 599 } 600 strncpy(hostbuf, name, MAXDNAME); 601 hostbuf[MAXDNAME] = '\0'; 602 bp = hostbuf + MAXDNAME; 603 ep = hostbuf + sizeof hostbuf; 604 host.h_name = hostbuf; 605 host.h_aliases = host_aliases; 606 host_aliases[0] = NULL; 607 h_addr_ptrs[0] = (char *)(void *)host_addr; 608 h_addr_ptrs[1] = NULL; 609 host.h_addr_list = h_addr_ptrs; 610 if (_res.options & RES_USE_INET6) 611 map_v4v6_hostent(&host, &bp, ep); 612 h_errno = NETDB_SUCCESS; 613 return (&host); 614 } 615 if (!isdigit((u_char) *cp) && *cp != '.') 616 break; 617 } 618 if ((isxdigit((u_char) name[0]) && strchr(name, ':') != NULL) || 619 name[0] == ':') 620 for (cp = name;; ++cp) { 621 if (!*cp) { 622 if (*--cp == '.') 623 break; 624 /* 625 * All-IPv6-legal, no dot at the end. 626 * Fake up a hostent as if we'd actually 627 * done a lookup. 628 */ 629 if (inet_pton(af, name, 630 (char *)(void *)host_addr) <= 0) { 631 h_errno = HOST_NOT_FOUND; 632 return (NULL); 633 } 634 strncpy(hostbuf, name, MAXDNAME); 635 hostbuf[MAXDNAME] = '\0'; 636 bp = hostbuf + MAXDNAME; 637 ep = hostbuf + sizeof hostbuf; 638 host.h_name = hostbuf; 639 host.h_aliases = host_aliases; 640 host_aliases[0] = NULL; 641 h_addr_ptrs[0] = (char *)(void *)host_addr; 642 h_addr_ptrs[1] = NULL; 643 host.h_addr_list = h_addr_ptrs; 644 h_errno = NETDB_SUCCESS; 645 return (&host); 646 } 647 if (!isxdigit((u_char) *cp) && *cp != ':' && *cp != '.') 648 break; 649 } 650 651 hp = (struct hostent *)NULL; 652 h_errno = NETDB_INTERNAL; 653 if (nsdispatch(&hp, dtab, NSDB_HOSTS, "gethostbyname", 654 default_dns_files, name, strlen(name), af) != NS_SUCCESS) 655 return (struct hostent *)NULL; 656 h_errno = NETDB_SUCCESS; 657 return (hp); 658 } 659 660 struct hostent * 661 gethostbyaddr(addr, len, af) 662 const char *addr; /* XXX should have been def'd as u_char! */ 663 socklen_t len; 664 int af; 665 { 666 const u_char *uaddr = (const u_char *)addr; 667 int size; 668 struct hostent *hp; 669 static const ns_dtab dtab[] = { 670 NS_FILES_CB(_gethtbyaddr, NULL) 671 { NSSRC_DNS, _dns_gethtbyaddr, NULL }, /* force -DHESIOD */ 672 NS_NIS_CB(_yp_gethtbyaddr, NULL) 673 { 0 } 674 }; 675 676 _DIAGASSERT(addr != NULL); 677 678 if (af == AF_INET6 && len == IN6ADDRSZ && 679 (IN6_IS_ADDR_LINKLOCAL((const struct in6_addr *)(const void *)uaddr) || 680 IN6_IS_ADDR_SITELOCAL((const struct in6_addr *)(const void *)uaddr))) { 681 h_errno = HOST_NOT_FOUND; 682 return (NULL); 683 } 684 if (af == AF_INET6 && len == IN6ADDRSZ && 685 (IN6_IS_ADDR_V4MAPPED((const struct in6_addr *)(const void *)uaddr) || 686 IN6_IS_ADDR_V4COMPAT((const struct in6_addr *)(const void *)uaddr))) { 687 /* Unmap. */ 688 addr += IN6ADDRSZ - INADDRSZ; 689 uaddr += IN6ADDRSZ - INADDRSZ; 690 af = AF_INET; 691 len = INADDRSZ; 692 } 693 switch (af) { 694 case AF_INET: 695 size = INADDRSZ; 696 break; 697 case AF_INET6: 698 size = IN6ADDRSZ; 699 break; 700 default: 701 errno = EAFNOSUPPORT; 702 h_errno = NETDB_INTERNAL; 703 return (NULL); 704 } 705 if (size != len) { 706 errno = EINVAL; 707 h_errno = NETDB_INTERNAL; 708 return (NULL); 709 } 710 hp = (struct hostent *)NULL; 711 h_errno = NETDB_INTERNAL; 712 if (nsdispatch(&hp, dtab, NSDB_HOSTS, "gethostbyaddr", 713 default_dns_files, uaddr, len, af) != NS_SUCCESS) 714 return (struct hostent *)NULL; 715 h_errno = NETDB_SUCCESS; 716 return (hp); 717 } 718 719 void 720 _sethtent(f) 721 int f; 722 { 723 if (!hostf) 724 hostf = fopen(_PATH_HOSTS, "r" ); 725 else 726 rewind(hostf); 727 stayopen = f; 728 } 729 730 void 731 _endhtent() 732 { 733 if (hostf && !stayopen) { 734 (void) fclose(hostf); 735 hostf = NULL; 736 } 737 } 738 739 struct hostent * 740 _gethtent() 741 { 742 char *p; 743 char *cp, **q; 744 int af, len; 745 746 if (!hostf && !(hostf = fopen(_PATH_HOSTS, "r" ))) { 747 h_errno = NETDB_INTERNAL; 748 return (NULL); 749 } 750 again: 751 if (!(p = fgets(hostbuf, sizeof hostbuf, hostf))) { 752 h_errno = HOST_NOT_FOUND; 753 return (NULL); 754 } 755 if (*p == '#') 756 goto again; 757 if (!(cp = strpbrk(p, "#\n"))) 758 goto again; 759 *cp = '\0'; 760 if (!(cp = strpbrk(p, " \t"))) 761 goto again; 762 *cp++ = '\0'; 763 if (inet_pton(AF_INET6, p, (char *)(void *)host_addr) > 0) { 764 af = AF_INET6; 765 len = IN6ADDRSZ; 766 } else if (inet_pton(AF_INET, p, (char *)(void *)host_addr) > 0) { 767 if (_res.options & RES_USE_INET6) { 768 map_v4v6_address((char *)(void *)host_addr, 769 (char *)(void *)host_addr); 770 af = AF_INET6; 771 len = IN6ADDRSZ; 772 } else { 773 af = AF_INET; 774 len = INADDRSZ; 775 } 776 } else { 777 goto again; 778 } 779 /* if this is not something we're looking for, skip it. */ 780 if (host.h_addrtype != af) 781 goto again; 782 if (host.h_length != len) 783 goto again; 784 h_addr_ptrs[0] = (char *)(void *)host_addr; 785 h_addr_ptrs[1] = NULL; 786 host.h_addr_list = h_addr_ptrs; 787 host.h_length = len; 788 host.h_addrtype = af; 789 while (*cp == ' ' || *cp == '\t') 790 cp++; 791 host.h_name = cp; 792 q = host.h_aliases = host_aliases; 793 if ((cp = strpbrk(cp, " \t")) != NULL) 794 *cp++ = '\0'; 795 while (cp && *cp) { 796 if (*cp == ' ' || *cp == '\t') { 797 cp++; 798 continue; 799 } 800 if (q < &host_aliases[MAXALIASES - 1]) 801 *q++ = cp; 802 if ((cp = strpbrk(cp, " \t")) != NULL) 803 *cp++ = '\0'; 804 } 805 *q = NULL; 806 h_errno = NETDB_SUCCESS; 807 return (&host); 808 } 809 810 /*ARGSUSED*/ 811 int 812 _gethtbyname(rv, cb_data, ap) 813 void *rv; 814 void *cb_data; 815 va_list ap; 816 { 817 struct hostent *hp; 818 const char *name; 819 int af; 820 821 _DIAGASSERT(rv != NULL); 822 823 name = va_arg(ap, char *); 824 /* NOSTRICT skip len */(void)va_arg(ap, int); 825 af = va_arg(ap, int); 826 827 hp = NULL; 828 #if 0 829 if (_res.options & RES_USE_INET6) 830 hp = _gethtbyname2(name, AF_INET6); 831 if (hp==NULL) 832 hp = _gethtbyname2(name, AF_INET); 833 #else 834 hp = _gethtbyname2(name, af); 835 #endif 836 *((struct hostent **)rv) = hp; 837 if (hp == NULL) { 838 h_errno = HOST_NOT_FOUND; 839 return NS_NOTFOUND; 840 } 841 return NS_SUCCESS; 842 } 843 844 struct hostent * 845 _gethtbyname2(name, af) 846 const char *name; 847 int af; 848 { 849 struct hostent *p; 850 char *tmpbuf, *ptr, **cp; 851 int num; 852 size_t len; 853 854 _DIAGASSERT(name != NULL); 855 856 _sethtent(0); 857 ptr = tmpbuf = NULL; 858 num = 0; 859 while ((p = _gethtent()) != NULL && num < MAXADDRS) { 860 if (p->h_addrtype != af) 861 continue; 862 if (strcasecmp(p->h_name, name) != 0) { 863 for (cp = p->h_aliases; *cp != NULL; cp++) 864 if (strcasecmp(*cp, name) == 0) 865 break; 866 if (*cp == NULL) continue; 867 } 868 869 if (num == 0) { 870 size_t bufsize; 871 char *src; 872 873 bufsize = strlen(p->h_name) + 2 + 874 MAXADDRS * p->h_length + 875 ALIGNBYTES; 876 for (cp = p->h_aliases; *cp != NULL; cp++) 877 bufsize += strlen(*cp) + 1; 878 879 if ((tmpbuf = malloc(bufsize)) == NULL) { 880 h_errno = NETDB_INTERNAL; 881 return NULL; 882 } 883 884 ptr = tmpbuf; 885 src = p->h_name; 886 while ((*ptr++ = *src++) != '\0'); 887 for (cp = p->h_aliases; *cp != NULL; cp++) { 888 src = *cp; 889 while ((*ptr++ = *src++) != '\0'); 890 } 891 *ptr++ = '\0'; 892 893 ptr = (char *)(void *)ALIGN(ptr); 894 } 895 896 (void)memcpy(ptr, p->h_addr_list[0], (size_t)p->h_length); 897 ptr += p->h_length; 898 num++; 899 } 900 _endhtent(); 901 if (num == 0) return NULL; 902 903 len = ptr - tmpbuf; 904 if (len > (sizeof(hostbuf) - ALIGNBYTES)) { 905 free(tmpbuf); 906 errno = ENOSPC; 907 h_errno = NETDB_INTERNAL; 908 return NULL; 909 } 910 ptr = memcpy((void *)ALIGN(hostbuf), tmpbuf, len); 911 free(tmpbuf); 912 913 host.h_name = ptr; 914 while (*ptr++); 915 916 cp = host_aliases; 917 while (*ptr) { 918 *cp++ = ptr; 919 while (*ptr++); 920 } 921 ptr++; 922 *cp = NULL; 923 924 ptr = (char *)(void *)ALIGN(ptr); 925 cp = h_addr_ptrs; 926 while (num--) { 927 *cp++ = ptr; 928 ptr += host.h_length; 929 } 930 *cp = NULL; 931 932 return (&host); 933 } 934 935 /*ARGSUSED*/ 936 int 937 _gethtbyaddr(rv, cb_data, ap) 938 void *rv; 939 void *cb_data; 940 va_list ap; 941 { 942 struct hostent *p; 943 const unsigned char *addr; 944 int len, af; 945 946 _DIAGASSERT(rv != NULL); 947 948 addr = va_arg(ap, unsigned char *); 949 len = va_arg(ap, int); 950 af = va_arg(ap, int); 951 952 host.h_length = len; 953 host.h_addrtype = af; 954 955 _sethtent(0); 956 while ((p = _gethtent()) != NULL) 957 if (p->h_addrtype == af && !memcmp(p->h_addr, addr, 958 (size_t)len)) 959 break; 960 _endhtent(); 961 *((struct hostent **)rv) = p; 962 if (p==NULL) { 963 h_errno = HOST_NOT_FOUND; 964 return NS_NOTFOUND; 965 } 966 return NS_SUCCESS; 967 } 968 969 static void 970 map_v4v6_address(src, dst) 971 const char *src; 972 char *dst; 973 { 974 u_char *p = (u_char *)dst; 975 char tmp[INADDRSZ]; 976 int i; 977 978 _DIAGASSERT(src != NULL); 979 _DIAGASSERT(dst != NULL); 980 981 /* Stash a temporary copy so our caller can update in place. */ 982 (void)memcpy(tmp, src, INADDRSZ); 983 /* Mark this ipv6 addr as a mapped ipv4. */ 984 for (i = 0; i < 10; i++) 985 *p++ = 0x00; 986 *p++ = 0xff; 987 *p++ = 0xff; 988 /* Retrieve the saved copy and we're done. */ 989 (void)memcpy((void *)p, tmp, INADDRSZ); 990 } 991 992 static void 993 map_v4v6_hostent(hp, bpp, ep) 994 struct hostent *hp; 995 char **bpp; 996 char *ep; 997 { 998 char **ap; 999 1000 _DIAGASSERT(hp != NULL); 1001 _DIAGASSERT(bpp != NULL); 1002 _DIAGASSERT(ep != NULL); 1003 1004 if (hp->h_addrtype != AF_INET || hp->h_length != INADDRSZ) 1005 return; 1006 hp->h_addrtype = AF_INET6; 1007 hp->h_length = IN6ADDRSZ; 1008 for (ap = hp->h_addr_list; *ap; ap++) { 1009 int i = sizeof(align) - (size_t)((u_long)*bpp % sizeof(align)); 1010 1011 if (ep - *bpp < (i + IN6ADDRSZ)) { 1012 /* Out of memory. Truncate address list here. XXX */ 1013 *ap = NULL; 1014 return; 1015 } 1016 *bpp += i; 1017 map_v4v6_address(*ap, *bpp); 1018 *ap = *bpp; 1019 *bpp += IN6ADDRSZ; 1020 } 1021 } 1022 1023 #ifdef RESOLVSORT 1024 static void 1025 addrsort(ap, num) 1026 char **ap; 1027 int num; 1028 { 1029 int i, j; 1030 char **p; 1031 short aval[MAXADDRS]; 1032 int needsort = 0; 1033 1034 _DIAGASSERT(ap != NULL); 1035 1036 p = ap; 1037 for (i = 0; i < num; i++, p++) { 1038 for (j = 0 ; (unsigned)j < _res.nsort; j++) 1039 if (_res.sort_list[j].addr.s_addr == 1040 (((struct in_addr *)(void *)(*p))->s_addr & 1041 _res.sort_list[j].mask)) 1042 break; 1043 aval[i] = j; 1044 if (needsort == 0 && i > 0 && j < aval[i-1]) 1045 needsort = i; 1046 } 1047 if (!needsort) 1048 return; 1049 1050 while (needsort < num) { 1051 for (j = needsort - 1; j >= 0; j--) { 1052 if (aval[j] > aval[j+1]) { 1053 char *hp; 1054 1055 i = aval[j]; 1056 aval[j] = aval[j+1]; 1057 aval[j+1] = i; 1058 1059 hp = ap[j]; 1060 ap[j] = ap[j+1]; 1061 ap[j+1] = hp; 1062 } else 1063 break; 1064 } 1065 needsort++; 1066 } 1067 } 1068 #endif 1069 1070 #if defined(BSD43_BSD43_NFS) || defined(sun) 1071 /* XXX: should we remove this cruft? - lukem */ 1072 /* some libc's out there are bound internally to these names (UMIPS) */ 1073 void 1074 ht_sethostent(stayopen) 1075 int stayopen; 1076 { 1077 _sethtent(stayopen); 1078 } 1079 1080 void 1081 ht_endhostent() 1082 { 1083 _endhtent(); 1084 } 1085 1086 struct hostent * 1087 ht_gethostbyname(name) 1088 char *name; 1089 { 1090 return (_gethtbyname(name)); 1091 } 1092 1093 struct hostent * 1094 ht_gethostbyaddr(addr, len, af) 1095 const char *addr; 1096 int len, af; 1097 { 1098 return (_gethtbyaddr(addr, len, af)); 1099 } 1100 1101 struct hostent * 1102 gethostent() 1103 { 1104 return (_gethtent()); 1105 } 1106 1107 void 1108 dns_service() 1109 { 1110 return; 1111 } 1112 1113 int 1114 dn_skipname(comp_dn, eom) 1115 const u_char *comp_dn, *eom; 1116 { 1117 return (__dn_skipname(comp_dn, eom)); 1118 } 1119 #endif /*old-style libc with yp junk in it*/ 1120 1121 /*ARGSUSED*/ 1122 int 1123 _dns_gethtbyname(rv, cb_data, ap) 1124 void *rv; 1125 void *cb_data; 1126 va_list ap; 1127 { 1128 querybuf buf; 1129 int n, type; 1130 struct hostent *hp; 1131 const char *name; 1132 int af; 1133 1134 _DIAGASSERT(rv != NULL); 1135 1136 name = va_arg(ap, char *); 1137 /* NOSTRICT skip len */(void)va_arg(ap, int); 1138 af = va_arg(ap, int); 1139 1140 switch (af) { 1141 case AF_INET: 1142 type = T_A; 1143 break; 1144 case AF_INET6: 1145 type = T_AAAA; 1146 break; 1147 default: 1148 return NS_UNAVAIL; 1149 } 1150 if ((n = res_search(name, C_IN, type, buf.buf, sizeof(buf))) < 0) { 1151 dprintf("res_search failed (%d)\n", n); 1152 return NS_NOTFOUND; 1153 } 1154 hp = getanswer(&buf, n, name, type); 1155 if (hp == NULL) 1156 switch (h_errno) { 1157 case HOST_NOT_FOUND: 1158 return NS_NOTFOUND; 1159 case TRY_AGAIN: 1160 return NS_TRYAGAIN; 1161 default: 1162 return NS_UNAVAIL; 1163 } 1164 *((struct hostent **)rv) = hp; 1165 return NS_SUCCESS; 1166 } 1167 1168 /*ARGSUSED*/ 1169 int 1170 _dns_gethtbyaddr(rv, cb_data, ap) 1171 void *rv; 1172 void *cb_data; 1173 va_list ap; 1174 { 1175 char qbuf[MAXDNAME + 1], *qp, *ep; 1176 int n; 1177 querybuf buf; 1178 struct hostent *hp; 1179 const unsigned char *uaddr; 1180 int len, af, advance; 1181 1182 _DIAGASSERT(rv != NULL); 1183 1184 uaddr = va_arg(ap, unsigned char *); 1185 len = va_arg(ap, int); 1186 af = va_arg(ap, int); 1187 1188 switch (af) { 1189 case AF_INET: 1190 (void)snprintf(qbuf, sizeof(qbuf), "%u.%u.%u.%u.in-addr.arpa", 1191 (uaddr[3] & 0xff), (uaddr[2] & 0xff), 1192 (uaddr[1] & 0xff), (uaddr[0] & 0xff)); 1193 break; 1194 1195 case AF_INET6: 1196 qp = qbuf; 1197 ep = qbuf + sizeof(qbuf) - 1; 1198 for (n = IN6ADDRSZ - 1; n >= 0; n--) { 1199 advance = snprintf(qp, (size_t)(ep - qp), "%x.%x.", 1200 uaddr[n] & 0xf, 1201 ((unsigned int)uaddr[n] >> 4) & 0xf); 1202 if (advance > 0 && qp + advance < ep) 1203 qp += advance; 1204 else { 1205 h_errno = NETDB_INTERNAL; 1206 return NS_NOTFOUND; 1207 } 1208 } 1209 if (strlcat(qbuf, "ip6.arpa", sizeof(qbuf)) >= sizeof(qbuf)) { 1210 h_errno = NETDB_INTERNAL; 1211 return NS_NOTFOUND; 1212 } 1213 break; 1214 default: 1215 abort(); 1216 } 1217 1218 n = res_query(qbuf, C_IN, T_PTR, (u_char *)(void *)&buf, sizeof(buf)); 1219 if (n < 0 && af == AF_INET6) { 1220 *qp = '\0'; 1221 if (strlcat(qbuf, "ip6.int", sizeof(qbuf)) >= sizeof(qbuf)) { 1222 h_errno = NETDB_INTERNAL; 1223 return NS_NOTFOUND; 1224 } 1225 n = res_query(qbuf, C_IN, T_PTR, (u_char *)(void *)&buf, 1226 sizeof(buf)); 1227 } 1228 if (n < 0) { 1229 dprintf("res_query failed (%d)\n", n); 1230 return NS_NOTFOUND; 1231 } 1232 hp = getanswer(&buf, n, qbuf, T_PTR); 1233 if (hp == NULL) 1234 switch (h_errno) { 1235 case HOST_NOT_FOUND: 1236 return NS_NOTFOUND; 1237 case TRY_AGAIN: 1238 return NS_TRYAGAIN; 1239 default: 1240 return NS_UNAVAIL; 1241 } 1242 hp->h_addrtype = af; 1243 hp->h_length = len; 1244 (void)memcpy(host_addr, uaddr, (size_t)len); 1245 h_addr_ptrs[0] = (char *)(void *)host_addr; 1246 h_addr_ptrs[1] = NULL; 1247 if (af == AF_INET && (_res.options & RES_USE_INET6)) { 1248 map_v4v6_address((char *)(void *)host_addr, 1249 (char *)(void *)host_addr); 1250 hp->h_addrtype = AF_INET6; 1251 hp->h_length = IN6ADDRSZ; 1252 } 1253 1254 *((struct hostent **)rv) = hp; 1255 h_errno = NETDB_SUCCESS; 1256 return NS_SUCCESS; 1257 } 1258 1259 #ifdef YP 1260 /*ARGSUSED*/ 1261 struct hostent * 1262 _yphostent(line, af) 1263 char *line; 1264 int af; 1265 { 1266 static struct in_addr host_addrs[MAXADDRS]; 1267 static struct in6_addr host6_addrs[MAXADDRS]; 1268 char *p = line; 1269 char *cp, **q; 1270 char **hap; 1271 int addrok; 1272 int more; 1273 int naddrs; 1274 1275 _DIAGASSERT(line != NULL); 1276 1277 host.h_name = NULL; 1278 host.h_addr_list = h_addr_ptrs; 1279 host.h_addrtype = af; 1280 switch (af) { 1281 case AF_INET: 1282 host.h_length = INADDRSZ; 1283 break; 1284 case AF_INET6: 1285 host.h_length = IN6ADDRSZ; 1286 break; 1287 default: 1288 return (NULL); 1289 } 1290 hap = h_addr_ptrs; 1291 q = host.h_aliases = host_aliases; 1292 naddrs = 0; 1293 1294 nextline: 1295 /* check for host_addrs overflow */ 1296 if (naddrs >= sizeof(host_addrs) / sizeof(host_addrs[0])) 1297 goto done; 1298 if (naddrs >= sizeof(host6_addrs) / sizeof(host6_addrs[0])) 1299 goto done; 1300 1301 more = 0; 1302 cp = strpbrk(p, " \t"); 1303 if (cp == NULL) 1304 goto done; 1305 *cp++ = '\0'; 1306 1307 /* p has should have an address */ 1308 switch (af) { 1309 case AF_INET: 1310 addrok = inet_aton(p, &host_addrs[naddrs]); 1311 break; 1312 case AF_INET6: 1313 addrok = inet_pton(af, p, &host6_addrs[naddrs]); 1314 break; 1315 } 1316 if (addrok != 1) { 1317 /* skip to the next line */ 1318 while (cp && *cp) { 1319 if (*cp == '\n') { 1320 cp++; 1321 goto nextline; 1322 } 1323 cp++; 1324 } 1325 1326 goto done; 1327 } 1328 1329 switch (af) { 1330 case AF_INET: 1331 *hap++ = (char *)(void *)&host_addrs[naddrs++]; 1332 break; 1333 case AF_INET6: 1334 *hap++ = (char *)(void *)&host6_addrs[naddrs++]; 1335 break; 1336 } 1337 1338 while (*cp == ' ' || *cp == '\t') 1339 cp++; 1340 p = cp; 1341 cp = strpbrk(p, " \t\n"); 1342 if (cp != NULL) { 1343 if (*cp == '\n') 1344 more = 1; 1345 *cp++ = '\0'; 1346 } 1347 if (!host.h_name) 1348 host.h_name = p; 1349 else if (strcmp(host.h_name, p)==0) 1350 ; 1351 else if (q < &host_aliases[MAXALIASES - 1]) 1352 *q++ = p; 1353 p = cp; 1354 if (more) 1355 goto nextline; 1356 1357 while (cp && *cp) { 1358 if (*cp == ' ' || *cp == '\t') { 1359 cp++; 1360 continue; 1361 } 1362 if (*cp == '\n') { 1363 cp++; 1364 goto nextline; 1365 } 1366 if (q < &host_aliases[MAXALIASES - 1]) 1367 *q++ = cp; 1368 cp = strpbrk(cp, " \t"); 1369 if (cp != NULL) 1370 *cp++ = '\0'; 1371 } 1372 1373 done: 1374 if (host.h_name == NULL) 1375 return (NULL); 1376 *q = NULL; 1377 *hap = NULL; 1378 return (&host); 1379 } 1380 1381 /*ARGSUSED*/ 1382 int 1383 _yp_gethtbyaddr(rv, cb_data, ap) 1384 void *rv; 1385 void *cb_data; 1386 va_list ap; 1387 { 1388 struct hostent *hp = (struct hostent *)NULL; 1389 static char *__ypcurrent; 1390 int __ypcurrentlen, r; 1391 char name[INET6_ADDRSTRLEN]; /* XXX enough? */ 1392 const unsigned char *uaddr; 1393 int af; 1394 const char *map; 1395 1396 _DIAGASSERT(rv != NULL); 1397 1398 uaddr = va_arg(ap, unsigned char *); 1399 /* NOSTRICT skip len */(void)va_arg(ap, int); 1400 af = va_arg(ap, int); 1401 1402 if (!__ypdomain) { 1403 if (_yp_check(&__ypdomain) == 0) 1404 return NS_UNAVAIL; 1405 } 1406 /* 1407 * XXX unfortunately, we cannot support IPv6 extended scoped address 1408 * notation here. gethostbyaddr() is not scope-aware. too bad. 1409 */ 1410 if (inet_ntop(af, uaddr, name, sizeof(name)) == NULL) 1411 return NS_UNAVAIL; 1412 if (__ypcurrent) 1413 free(__ypcurrent); 1414 __ypcurrent = NULL; 1415 switch (af) { 1416 case AF_INET: 1417 map = "hosts.byaddr"; 1418 break; 1419 default: 1420 map = "ipnodes.byaddr"; 1421 break; 1422 } 1423 r = yp_match(__ypdomain, map, name, 1424 (int)strlen(name), &__ypcurrent, &__ypcurrentlen); 1425 if (r==0) 1426 hp = _yphostent(__ypcurrent, af); 1427 if (hp==NULL) { 1428 h_errno = HOST_NOT_FOUND; 1429 return NS_NOTFOUND; 1430 } 1431 *((struct hostent **)rv) = hp; 1432 return NS_SUCCESS; 1433 } 1434 1435 /*ARGSUSED*/ 1436 int 1437 _yp_gethtbyname(rv, cb_data, ap) 1438 void *rv; 1439 void *cb_data; 1440 va_list ap; 1441 { 1442 struct hostent *hp = (struct hostent *)NULL; 1443 static char *__ypcurrent; 1444 int __ypcurrentlen, r; 1445 const char *name; 1446 int af; 1447 const char *map; 1448 1449 _DIAGASSERT(rv != NULL); 1450 1451 name = va_arg(ap, char *); 1452 /* NOSTRICT skip len */(void)va_arg(ap, int); 1453 af = va_arg(ap, int); 1454 1455 if (!__ypdomain) { 1456 if (_yp_check(&__ypdomain) == 0) 1457 return NS_UNAVAIL; 1458 } 1459 if (__ypcurrent) 1460 free(__ypcurrent); 1461 __ypcurrent = NULL; 1462 switch (af) { 1463 case AF_INET: 1464 map = "hosts.byname"; 1465 break; 1466 default: 1467 map = "ipnodes.byname"; 1468 break; 1469 } 1470 r = yp_match(__ypdomain, map, name, 1471 (int)strlen(name), &__ypcurrent, &__ypcurrentlen); 1472 if (r==0) 1473 hp = _yphostent(__ypcurrent, af); 1474 if (hp==NULL) { 1475 h_errno = HOST_NOT_FOUND; 1476 return NS_NOTFOUND; 1477 } 1478 *((struct hostent **)rv) = hp; 1479 return NS_SUCCESS; 1480 } 1481 #endif 1482
Indexes created Thu Sep 25 16:09:42 GMT 2025