1/*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 1994, Garrett Wollman 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28#include "namespace.h" 29#include "reentrant.h" 30#include <sys/param.h> 31#include <sys/socket.h> 32#include <netinet/in.h> 33#include <arpa/inet.h> 34#include <netdb.h> 35#include <stdio.h> 36#include <ctype.h> 37#include <errno.h> 38#include <stdlib.h> 39#include <string.h> 40#include <stdarg.h> 41#include <nsswitch.h> 42#include <arpa/nameser.h> /* XXX hack for _res */ 43#include <resolv.h> /* XXX hack for _res */ 44#include "un-namespace.h" 45#include "netdb_private.h" 46#ifdef NS_CACHING 47#include "nscache.h" 48#endif 49 50static int gethostbyname_internal(const char *, int, struct hostent *, char *, 51 size_t, struct hostent **, int *, res_state); 52 53/* Host lookup order if nsswitch.conf is broken or nonexistent */ 54static const ns_src default_src[] = { 55 { NSSRC_FILES, NS_SUCCESS }, 56 { NSSRC_DNS, NS_SUCCESS }, 57 { 0 } 58}; 59#ifdef NS_CACHING 60static int host_id_func(char *, size_t *, va_list, void *); 61static int host_marshal_func(char *, size_t *, void *, va_list, void *); 62static int host_unmarshal_func(char *, size_t, void *, va_list, void *); 63#endif 64 65NETDB_THREAD_ALLOC(hostent) 66NETDB_THREAD_ALLOC(hostent_data) 67NETDB_THREAD_ALLOC(hostdata) 68 69static void 70hostent_free(void *ptr) 71{ 72 free(ptr); 73} 74 75static void 76hostent_data_free(void *ptr) 77{ 78 struct hostent_data *hed = ptr; 79 80 if (hed == NULL) 81 return; 82 hed->stayopen = 0; 83 _endhosthtent(hed); 84 free(hed); 85} 86 87static void 88hostdata_free(void *ptr) 89{ 90 free(ptr); 91} 92 93int 94__copy_hostent(struct hostent *he, struct hostent *hptr, char *buf, 95 size_t buflen) 96{ 97 char *cp; 98 char **ptr; 99 int i, n; 100 int nptr, len; 101 102 /* Find out the amount of space required to store the answer. */ 103 nptr = 2; /* NULL ptrs */ 104 len = (char *)ALIGN(buf) - buf; 105 for (i = 0; he->h_addr_list[i]; i++, nptr++) { 106 len += he->h_length; 107 } 108 for (i = 0; he->h_aliases[i]; i++, nptr++) { 109 len += strlen(he->h_aliases[i]) + 1; 110 } 111 len += strlen(he->h_name) + 1; 112 len += nptr * sizeof(char*); 113 114 if (len > buflen) { 115 errno = ERANGE; 116 return (-1); 117 } 118 119 /* copy address size and type */ 120 hptr->h_addrtype = he->h_addrtype; 121 n = hptr->h_length = he->h_length; 122 123 ptr = (char **)ALIGN(buf); 124 cp = (char *)ALIGN(buf) + nptr * sizeof(char *); 125 126 /* copy address list */ 127 hptr->h_addr_list = ptr; 128 for (i = 0; he->h_addr_list[i]; i++ , ptr++) { 129 memcpy(cp, he->h_addr_list[i], n); 130 hptr->h_addr_list[i] = cp; 131 cp += n; 132 } 133 hptr->h_addr_list[i] = NULL; 134 ptr++; 135 136 /* copy official name */ 137 n = strlen(he->h_name) + 1; 138 strcpy(cp, he->h_name); 139 hptr->h_name = cp; 140 cp += n; 141 142 /* copy aliases */ 143 hptr->h_aliases = ptr; 144 for (i = 0 ; he->h_aliases[i]; i++) { 145 n = strlen(he->h_aliases[i]) + 1; 146 strcpy(cp, he->h_aliases[i]); 147 hptr->h_aliases[i] = cp; 148 cp += n; 149 } 150 hptr->h_aliases[i] = NULL; 151 152 return (0); 153} 154 155#ifdef NS_CACHING 156static int 157host_id_func(char *buffer, size_t *buffer_size, va_list ap, void *cache_mdata) 158{ 159 res_state statp; 160 u_long res_options; 161 162 const int op_id = 1; 163 char *str; 164 void *addr; 165 socklen_t len; 166 int type; 167 168 size_t desired_size, size; 169 enum nss_lookup_type lookup_type; 170 char *p; 171 int res = NS_UNAVAIL; 172 173 statp = __res_state(); 174 res_options = statp->options & (RES_RECURSE | RES_DEFNAMES | 175 RES_DNSRCH | RES_NOALIASES | RES_USE_INET6); 176 177 lookup_type = (enum nss_lookup_type)(uintptr_t)cache_mdata; 178 switch (lookup_type) { 179 case nss_lt_name: 180 str = va_arg(ap, char *); 181 type = va_arg(ap, int); 182 183 size = strlen(str); 184 desired_size = sizeof(res_options) + sizeof(int) + 185 sizeof(enum nss_lookup_type) + sizeof(int) + size + 1; 186 187 if (desired_size > *buffer_size) { 188 res = NS_RETURN; 189 goto fin; 190 } 191 192 p = buffer; 193 194 memcpy(p, &res_options, sizeof(res_options)); 195 p += sizeof(res_options); 196 197 memcpy(p, &op_id, sizeof(int)); 198 p += sizeof(int); 199 200 memcpy(p, &lookup_type, sizeof(enum nss_lookup_type)); 201 p += sizeof(int); 202 203 memcpy(p, &type, sizeof(int)); 204 p += sizeof(int); 205 206 memcpy(p, str, size + 1); 207 208 res = NS_SUCCESS; 209 break; 210 case nss_lt_id: 211 addr = va_arg(ap, void *); 212 len = va_arg(ap, socklen_t); 213 type = va_arg(ap, int); 214 215 desired_size = sizeof(res_options) + sizeof(int) + 216 sizeof(enum nss_lookup_type) + sizeof(int) + 217 sizeof(socklen_t) + len; 218 219 if (desired_size > *buffer_size) { 220 res = NS_RETURN; 221 goto fin; 222 } 223 224 p = buffer; 225 memcpy(p, &res_options, sizeof(res_options)); 226 p += sizeof(res_options); 227 228 memcpy(p, &op_id, sizeof(int)); 229 p += sizeof(int); 230 231 memcpy(p, &lookup_type, sizeof(enum nss_lookup_type)); 232 p += sizeof(int); 233 234 memcpy(p, &type, sizeof(int)); 235 p += sizeof(int); 236 237 memcpy(p, &len, sizeof(socklen_t)); 238 p += sizeof(socklen_t); 239 240 memcpy(p, addr, len); 241 242 res = NS_SUCCESS; 243 break; 244 default: 245 /* should be unreachable */ 246 return (NS_UNAVAIL); 247 } 248 249fin: 250 *buffer_size = desired_size; 251 return (res); 252} 253 254static int 255host_marshal_func(char *buffer, size_t *buffer_size, void *retval, va_list ap, 256 void *cache_mdata) 257{ 258 char *str __unused; 259 void *addr __unused; 260 socklen_t len __unused; 261 int type __unused; 262 struct hostent *ht; 263 264 struct hostent new_ht; 265 size_t desired_size, aliases_size, addr_size, size; 266 char *p, **iter; 267 268 switch ((enum nss_lookup_type)(uintptr_t)cache_mdata) { 269 case nss_lt_name: 270 str = va_arg(ap, char *); 271 type = va_arg(ap, int); 272 break; 273 case nss_lt_id: 274 addr = va_arg(ap, void *); 275 len = va_arg(ap, socklen_t); 276 type = va_arg(ap, int); 277 break; 278 default: 279 /* should be unreachable */ 280 return (NS_UNAVAIL); 281 } 282 ht = va_arg(ap, struct hostent *); 283 284 desired_size = _ALIGNBYTES + sizeof(struct hostent) + sizeof(char *); 285 if (ht->h_name != NULL) 286 desired_size += strlen(ht->h_name) + 1; 287 288 if (ht->h_aliases != NULL) { 289 aliases_size = 0; 290 for (iter = ht->h_aliases; *iter; ++iter) { 291 desired_size += strlen(*iter) + 1; 292 ++aliases_size; 293 } 294 295 desired_size += _ALIGNBYTES + 296 (aliases_size + 1) * sizeof(char *); 297 } 298 299 if (ht->h_addr_list != NULL) { 300 addr_size = 0; 301 for (iter = ht->h_addr_list; *iter; ++iter) 302 ++addr_size; 303 304 desired_size += addr_size * _ALIGN(ht->h_length); 305 desired_size += _ALIGNBYTES + (addr_size + 1) * sizeof(char *); 306 } 307 308 if (desired_size > *buffer_size) { 309 /* this assignment is here for future use */ 310 *buffer_size = desired_size; 311 return (NS_RETURN); 312 } 313 314 memcpy(&new_ht, ht, sizeof(struct hostent)); 315 memset(buffer, 0, desired_size); 316 317 *buffer_size = desired_size; 318 p = buffer + sizeof(struct hostent) + sizeof(char *); 319 memcpy(buffer + sizeof(struct hostent), &p, sizeof(char *)); 320 p = (char *)_ALIGN(p); 321 322 if (new_ht.h_name != NULL) { 323 size = strlen(new_ht.h_name); 324 memcpy(p, new_ht.h_name, size); 325 new_ht.h_name = p; 326 p += size + 1; 327 } 328 329 if (new_ht.h_aliases != NULL) { 330 p = (char *)_ALIGN(p); 331 memcpy(p, new_ht.h_aliases, sizeof(char *) * aliases_size); 332 new_ht.h_aliases = (char **)p; 333 p += sizeof(char *) * (aliases_size + 1); 334 335 for (iter = new_ht.h_aliases; *iter; ++iter) { 336 size = strlen(*iter); 337 memcpy(p, *iter, size); 338 *iter = p; 339 p += size + 1; 340 } 341 } 342 343 if (new_ht.h_addr_list != NULL) { 344 p = (char *)_ALIGN(p); 345 memcpy(p, new_ht.h_addr_list, sizeof(char *) * addr_size); 346 new_ht.h_addr_list = (char **)p; 347 p += sizeof(char *) * (addr_size + 1); 348 349 size = _ALIGN(new_ht.h_length); 350 for (iter = new_ht.h_addr_list; *iter; ++iter) { 351 memcpy(p, *iter, size); 352 *iter = p; 353 p += size + 1; 354 } 355 } 356 memcpy(buffer, &new_ht, sizeof(struct hostent)); 357 return (NS_SUCCESS); 358} 359 360static int 361host_unmarshal_func(char *buffer, size_t buffer_size, void *retval, va_list ap, 362 void *cache_mdata) 363{ 364 char *str __unused; 365 void *addr __unused; 366 socklen_t len __unused; 367 int type __unused; 368 struct hostent *ht; 369 370 char *p; 371 char **iter; 372 char *orig_buf; 373 size_t orig_buf_size; 374 375 switch ((enum nss_lookup_type)(uintptr_t)cache_mdata) { 376 case nss_lt_name: 377 str = va_arg(ap, char *); 378 type = va_arg(ap, int); 379 break; 380 case nss_lt_id: 381 addr = va_arg(ap, void *); 382 len = va_arg(ap, socklen_t); 383 type = va_arg(ap, int); 384 break; 385 default: 386 /* should be unreachable */ 387 return (NS_UNAVAIL); 388 } 389 390 ht = va_arg(ap, struct hostent *); 391 orig_buf = va_arg(ap, char *); 392 orig_buf_size = va_arg(ap, size_t); 393 394 if (orig_buf_size < 395 buffer_size - sizeof(struct hostent) - sizeof(char *)) { 396 errno = ERANGE; 397 return (NS_RETURN); 398 } 399 400 memcpy(ht, buffer, sizeof(struct hostent)); 401 memcpy(&p, buffer + sizeof(struct hostent), sizeof(char *)); 402 403 orig_buf = (char *)_ALIGN(orig_buf); 404 memcpy(orig_buf, buffer + sizeof(struct hostent) + sizeof(char *) + 405 _ALIGN(p) - (size_t)p, 406 buffer_size - sizeof(struct hostent) - sizeof(char *) - 407 _ALIGN(p) + (size_t)p); 408 p = (char *)_ALIGN(p); 409 410 NS_APPLY_OFFSET(ht->h_name, orig_buf, p, char *); 411 if (ht->h_aliases != NULL) { 412 NS_APPLY_OFFSET(ht->h_aliases, orig_buf, p, char **); 413 414 for (iter = ht->h_aliases; *iter; ++iter) 415 NS_APPLY_OFFSET(*iter, orig_buf, p, char *); 416 } 417 418 if (ht->h_addr_list != NULL) { 419 NS_APPLY_OFFSET(ht->h_addr_list, orig_buf, p, char **); 420 421 for (iter = ht->h_addr_list; *iter; ++iter) 422 NS_APPLY_OFFSET(*iter, orig_buf, p, char *); 423 } 424 425 *((struct hostent **)retval) = ht; 426 return (NS_SUCCESS); 427} 428#endif /* NS_CACHING */ 429 430static int 431fakeaddr(const char *name, int af, struct hostent *hp, char *buf, 432 size_t buflen, res_state statp) 433{ 434 struct hostent_data *hed; 435 struct hostent he; 436 437 if ((hed = __hostent_data_init()) == NULL) { 438 errno = ENOMEM; 439 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 440 return (-1); 441 } 442 443 if ((af != AF_INET || 444 inet_aton(name, (struct in_addr *)hed->host_addr) != 1) && 445 inet_pton(af, name, hed->host_addr) != 1) { 446 RES_SET_H_ERRNO(statp, HOST_NOT_FOUND); 447 return (-1); 448 } 449 strncpy(hed->hostbuf, name, MAXDNAME); 450 hed->hostbuf[MAXDNAME] = '\0'; 451 if (af == AF_INET && (statp->options & RES_USE_INET6) != 0U) { 452 _map_v4v6_address((char *)hed->host_addr, 453 (char *)hed->host_addr); 454 af = AF_INET6; 455 } 456 he.h_addrtype = af; 457 switch(af) { 458 case AF_INET: 459 he.h_length = NS_INADDRSZ; 460 break; 461 case AF_INET6: 462 he.h_length = NS_IN6ADDRSZ; 463 break; 464 default: 465 errno = EAFNOSUPPORT; 466 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 467 return (-1); 468 } 469 he.h_name = hed->hostbuf; 470 he.h_aliases = hed->host_aliases; 471 hed->host_aliases[0] = NULL; 472 hed->h_addr_ptrs[0] = (char *)hed->host_addr; 473 hed->h_addr_ptrs[1] = NULL; 474 he.h_addr_list = hed->h_addr_ptrs; 475 if (__copy_hostent(&he, hp, buf, buflen) != 0) { 476 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 477 return (-1); 478 } 479 RES_SET_H_ERRNO(statp, NETDB_SUCCESS); 480 return (0); 481} 482 483int 484gethostbyname_r(const char *name, struct hostent *he, char *buffer, 485 size_t buflen, struct hostent **result, int *h_errnop) 486{ 487 res_state statp; 488 489 statp = __res_state(); 490 if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1) { 491 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 492 return (-1); 493 } 494 if (statp->options & RES_USE_INET6) { 495 if (fakeaddr(name, AF_INET, he, buffer, buflen, statp) == 0) { 496 *result = he; 497 return (0); 498 } 499 if (gethostbyname_internal(name, AF_INET6, he, buffer, buflen, 500 result, h_errnop, statp) == 0) 501 return (0); 502 } 503 return (gethostbyname_internal(name, AF_INET, he, buffer, buflen, 504 result, h_errnop, statp)); 505} 506 507int 508gethostbyname2_r(const char *name, int af, struct hostent *he, char *buffer, 509 size_t buflen, struct hostent **result, int *h_errnop) 510{ 511 res_state statp; 512 513 statp = __res_state(); 514 if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1) { 515 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 516 return (-1); 517 } 518 return (gethostbyname_internal(name, af, he, buffer, buflen, result, 519 h_errnop, statp)); 520} 521 522int 523gethostbyname_internal(const char *name, int af, struct hostent *hp, char *buf, 524 size_t buflen, struct hostent **result, int *h_errnop, res_state statp) 525{ 526 const char *cp; 527 int rval, ret_errno = 0; 528 char abuf[MAXDNAME]; 529 530#ifdef NS_CACHING 531 static const nss_cache_info cache_info = 532 NS_COMMON_CACHE_INFO_INITIALIZER( 533 hosts, (void *)nss_lt_name, 534 host_id_func, host_marshal_func, host_unmarshal_func); 535#endif 536 static const ns_dtab dtab[] = { 537 NS_FILES_CB(_ht_gethostbyname, NULL) 538 { NSSRC_DNS, _dns_gethostbyname, NULL }, 539 NS_NIS_CB(_nis_gethostbyname, NULL) /* force -DHESIOD */ 540#ifdef NS_CACHING 541 NS_CACHE_CB(&cache_info) 542#endif 543 { 0 } 544 }; 545 546 switch (af) { 547 case AF_INET: 548 case AF_INET6: 549 break; 550 default: 551 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 552 *h_errnop = statp->res_h_errno; 553 errno = EAFNOSUPPORT; 554 return (-1); 555 } 556 557 /* 558 * if there aren't any dots, it could be a user-level alias. 559 * this is also done in res_query() since we are not the only 560 * function that looks up host names. 561 */ 562 if (!strchr(name, '.') && 563 (cp = res_hostalias(statp, name, abuf, sizeof abuf))) 564 name = cp; 565 566 if (fakeaddr(name, af, hp, buf, buflen, statp) == 0) { 567 *result = hp; 568 return (0); 569 } 570 571 rval = _nsdispatch((void *)result, dtab, NSDB_HOSTS, 572 "gethostbyname2_r", default_src, name, af, hp, buf, buflen, 573 &ret_errno, h_errnop); 574 575 if (rval != NS_SUCCESS) { 576 errno = ret_errno; 577 return ((ret_errno != 0) ? ret_errno : -1); 578 } 579 return (0); 580} 581 582int 583gethostbyaddr_r(const void *addr, socklen_t len, int af, struct hostent *hp, 584 char *buf, size_t buflen, struct hostent **result, int *h_errnop) 585{ 586 const u_char *uaddr = (const u_char *)addr; 587 const struct in6_addr *addr6; 588 socklen_t size; 589 int rval, ret_errno = 0; 590 res_state statp; 591 592#ifdef NS_CACHING 593 static const nss_cache_info cache_info = 594 NS_COMMON_CACHE_INFO_INITIALIZER( 595 hosts, (void *)nss_lt_id, 596 host_id_func, host_marshal_func, host_unmarshal_func); 597#endif 598 static const ns_dtab dtab[] = { 599 NS_FILES_CB(_ht_gethostbyaddr, NULL) 600 { NSSRC_DNS, _dns_gethostbyaddr, NULL }, 601 NS_NIS_CB(_nis_gethostbyaddr, NULL) /* force -DHESIOD */ 602#ifdef NS_CACHING 603 NS_CACHE_CB(&cache_info) 604#endif 605 { 0 } 606 }; 607 608 statp = __res_state(); 609 if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1) { 610 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 611 *h_errnop = statp->res_h_errno; 612 return (-1); 613 } 614 615 if (af == AF_INET6 && len == NS_IN6ADDRSZ) { 616 addr6 = (const struct in6_addr *)addr; 617 if (IN6_IS_ADDR_LINKLOCAL(addr6)) { 618 RES_SET_H_ERRNO(statp, HOST_NOT_FOUND); 619 *h_errnop = statp->res_h_errno; 620 return (-1); 621 } 622 if (IN6_IS_ADDR_V4MAPPED(addr6) || 623 IN6_IS_ADDR_V4COMPAT(addr6)) { 624 /* Unmap. */ 625 uaddr += NS_IN6ADDRSZ - NS_INADDRSZ; 626 af = AF_INET; 627 len = NS_INADDRSZ; 628 } 629 } 630 switch (af) { 631 case AF_INET: 632 size = NS_INADDRSZ; 633 break; 634 case AF_INET6: 635 size = NS_IN6ADDRSZ; 636 break; 637 default: 638 errno = EAFNOSUPPORT; 639 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 640 *h_errnop = statp->res_h_errno; 641 return (-1); 642 } 643 if (size != len) { 644 errno = EINVAL; 645 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 646 *h_errnop = statp->res_h_errno; 647 return (-1); 648 } 649 650 rval = _nsdispatch((void *)result, dtab, NSDB_HOSTS, 651 "gethostbyaddr_r", default_src, uaddr, len, af, hp, buf, buflen, 652 &ret_errno, h_errnop); 653 654 if (rval != NS_SUCCESS) { 655 errno = ret_errno; 656 return ((ret_errno != 0) ? ret_errno : -1); 657 } 658 return (0); 659} 660 661struct hostent * 662gethostbyname(const char *name) 663{ 664 struct hostdata *hd; 665 struct hostent *rval; 666 int ret_h_errno; 667 668 if ((hd = __hostdata_init()) == NULL) 669 return (NULL); 670 if (gethostbyname_r(name, &hd->host, hd->data, sizeof(hd->data), &rval, 671 &ret_h_errno) != 0) 672 return (NULL); 673 return (rval); 674} 675 676struct hostent * 677gethostbyname2(const char *name, int af) 678{ 679 struct hostdata *hd; 680 struct hostent *rval; 681 int ret_h_errno; 682 683 if ((hd = __hostdata_init()) == NULL) 684 return (NULL); 685 if (gethostbyname2_r(name, af, &hd->host, hd->data, sizeof(hd->data), 686 &rval, &ret_h_errno) != 0) 687 return (NULL); 688 return (rval); 689} 690 691struct hostent * 692gethostbyaddr(const void *addr, socklen_t len, int af) 693{ 694 struct hostdata *hd; 695 struct hostent *rval; 696 int ret_h_errno; 697 698 if ((hd = __hostdata_init()) == NULL) 699 return (NULL); 700 if (gethostbyaddr_r(addr, len, af, &hd->host, hd->data, 701 sizeof(hd->data), &rval, &ret_h_errno) != 0) 702 return (NULL); 703 return (rval); 704} 705 706void 707sethostent(int stayopen) 708{ 709 struct hostent_data *hed; 710 711 if ((hed = __hostent_data_init()) == NULL) 712 return; 713 _sethosthtent(stayopen, hed); 714 _sethostdnsent(stayopen); 715} 716 717void 718endhostent(void) 719{ 720 struct hostent_data *hed; 721 722 if ((hed = __hostent_data_init()) == NULL) 723 return; 724 _endhosthtent(hed); 725 _endhostdnsent(); 726} 727