1 /* Copyright (C) 1996-2022 Free Software Foundation, Inc. 2 This file is part of the GNU C Library. 3 4 The GNU C Library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU Lesser General Public 6 License as published by the Free Software Foundation; either 7 version 2.1 of the License, or (at your option) any later version. 8 9 The GNU C Library is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public 15 License along with the GNU C Library; if not, see 16 <https://www.gnu.org/licenses/>. */ 17 18 #include <netdb.h> 19 #include <string.h> 20 #include <resolv/res_hconf.h> 21 22 #define LOOKUP_TYPE struct hostent 23 #define FUNCTION_NAME gethostbyaddr 24 #define DATABASE_NAME hosts 25 #define ADD_PARAMS const void *addr, socklen_t len, int type 26 #define ADD_VARIABLES addr, len, type 27 #define NEED_H_ERRNO 1 28 #define NEED__RES 1 29 /* If the addr parameter is the IPv6 unspecified address no query must 30 be performed. */ 31 #define PREPROCESS \ 32 if (len == sizeof (struct in6_addr) \ 33 && __builtin_expect (memcmp (&__in6addr_any, addr, \ 34 sizeof (struct in6_addr)), 1) == 0) \ 35 { \ 36 *h_errnop = HOST_NOT_FOUND; \ 37 *result = NULL; \ 38 return ENOENT; \ 39 } 40 #define POSTPROCESS \ 41 if (status == NSS_STATUS_SUCCESS) \ 42 { \ 43 _res_hconf_reorder_addrs (resbuf); \ 44 _res_hconf_trim_domains (resbuf); \ 45 } 46 47 /* Special name for the lookup function. */ 48 #define DB_LOOKUP_FCT __nss_hosts_lookup2 49 50 #include "../nss/getXXbyYY_r.c" 51