getipnodebyname.c revision 55682
155682Smarkm/* 255682Smarkm * Copyright (c) 1999 Kungliga Tekniska H�gskolan 355682Smarkm * (Royal Institute of Technology, Stockholm, Sweden). 455682Smarkm * All rights reserved. 555682Smarkm * 655682Smarkm * Redistribution and use in source and binary forms, with or without 755682Smarkm * modification, are permitted provided that the following conditions 855682Smarkm * are met: 955682Smarkm * 1055682Smarkm * 1. Redistributions of source code must retain the above copyright 1155682Smarkm * notice, this list of conditions and the following disclaimer. 1255682Smarkm * 1355682Smarkm * 2. Redistributions in binary form must reproduce the above copyright 1455682Smarkm * notice, this list of conditions and the following disclaimer in the 1555682Smarkm * documentation and/or other materials provided with the distribution. 1655682Smarkm * 1755682Smarkm * 3. Neither the name of the Institute nor the names of its contributors 1855682Smarkm * may be used to endorse or promote products derived from this software 1955682Smarkm * without specific prior written permission. 2055682Smarkm * 2155682Smarkm * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 2255682Smarkm * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2355682Smarkm * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2455682Smarkm * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 2555682Smarkm * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2655682Smarkm * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2755682Smarkm * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2855682Smarkm * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2955682Smarkm * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3055682Smarkm * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3155682Smarkm * SUCH DAMAGE. 3255682Smarkm */ 3355682Smarkm 3455682Smarkm#ifdef HAVE_CONFIG_H 3555682Smarkm#include <config.h> 3655682SmarkmRCSID("$Id: getipnodebyname.c,v 1.3 1999/12/02 16:58:46 joda Exp $"); 3755682Smarkm#endif 3855682Smarkm 3955682Smarkm#include "roken.h" 4055682Smarkm 4155682Smarkm#ifndef HAVE_H_ERRNO 4255682Smarkmstatic int h_errno = NO_RECOVERY; 4355682Smarkm#endif 4455682Smarkm 4555682Smarkm/* 4655682Smarkm * lookup `name' (address family `af') in DNS and return a pointer 4755682Smarkm * to a malloced struct hostent or NULL. 4855682Smarkm */ 4955682Smarkm 5055682Smarkmstruct hostent * 5155682Smarkmgetipnodebyname (const char *name, int af, int flags, int *error_num) 5255682Smarkm{ 5355682Smarkm struct hostent *tmp; 5455682Smarkm 5555682Smarkm#ifdef HAVE_GETHOSTBYNAME2 5655682Smarkm tmp = gethostbyname2 (name, af); 5755682Smarkm#else 5855682Smarkm if (af != AF_INET) { 5955682Smarkm *error_num = NO_ADDRESS; 6055682Smarkm return NULL; 6155682Smarkm } 6255682Smarkm tmp = gethostbyname (name); 6355682Smarkm#endif 6455682Smarkm if (tmp == NULL) { 6555682Smarkm switch (h_errno) { 6655682Smarkm case HOST_NOT_FOUND : 6755682Smarkm case TRY_AGAIN : 6855682Smarkm case NO_RECOVERY : 6955682Smarkm *error_num = h_errno; 7055682Smarkm break; 7155682Smarkm case NO_DATA : 7255682Smarkm *error_num = NO_ADDRESS; 7355682Smarkm break; 7455682Smarkm default : 7555682Smarkm *error_num = NO_RECOVERY; 7655682Smarkm break; 7755682Smarkm } 7855682Smarkm return NULL; 7955682Smarkm } 8055682Smarkm tmp = copyhostent (tmp); 8155682Smarkm if (tmp == NULL) { 8255682Smarkm *error_num = TRY_AGAIN; 8355682Smarkm return NULL; 8455682Smarkm } 8555682Smarkm return tmp; 8655682Smarkm} 87