1 /* 2 * Copyright (c) 1999 Kungliga Tekniska H�gskolan 3 * (Royal Institute of Technology, Stockholm, Sweden). 4 * All rights reserved. 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 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * 3. Neither the name of the Institute nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifdef HAVE_CONFIG_H 35 #include <config.h> 36 RCSID("$Id: getipnodebyname.c 14773 2005-04-12 11:29:18Z lha $"); 37 #endif 38 39 #include "roken.h" 40 41 #ifndef HAVE_H_ERRNO 42 static int h_errno = NO_RECOVERY; 43 #endif 44 45 /* 46 * lookup `name' (address family `af') in DNS and return a pointer 47 * to a malloced struct hostent or NULL. 48 */ 49 50 struct hostent * ROKEN_LIB_FUNCTION 51 getipnodebyname (const char *name, int af, int flags, int *error_num) 52 { 53 struct hostent *tmp; 54 55 #ifdef HAVE_GETHOSTBYNAME2 56 tmp = gethostbyname2 (name, af); 57 #else 58 if (af != AF_INET) { 59 *error_num = NO_ADDRESS; 60 return NULL; 61 } 62 tmp = gethostbyname (name); 63 #endif 64 if (tmp == NULL) { 65 switch (h_errno) { 66 case HOST_NOT_FOUND : 67 case TRY_AGAIN : 68 case NO_RECOVERY : 69 *error_num = h_errno; 70 break; 71 case NO_DATA : 72 *error_num = NO_ADDRESS; 73 break; 74 default : 75 *error_num = NO_RECOVERY; 76 break; 77 } 78 return NULL; 79 } 80 tmp = copyhostent (tmp); 81 if (tmp == NULL) { 82 *error_num = TRY_AGAIN; 83 return NULL; 84 } 85 return tmp; 86 } 87