87 lines
2.6 KiB
C
87 lines
2.6 KiB
C
/*
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* Copyright (c) 1999 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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RCSID("$Id: getipnodebyname.c,v 1.3 1999/12/02 16:58:46 joda Exp $");
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#endif
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#include "roken.h"
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#ifndef HAVE_H_ERRNO
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static int h_errno = NO_RECOVERY;
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#endif
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/*
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* lookup `name' (address family `af') in DNS and return a pointer
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* to a malloced struct hostent or NULL.
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*/
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struct hostent *
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getipnodebyname (const char *name, int af, int flags, int *error_num)
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{
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struct hostent *tmp;
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#ifdef HAVE_GETHOSTBYNAME2
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tmp = gethostbyname2 (name, af);
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#else
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if (af != AF_INET) {
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*error_num = NO_ADDRESS;
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return NULL;
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}
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tmp = gethostbyname (name);
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#endif
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if (tmp == NULL) {
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switch (h_errno) {
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case HOST_NOT_FOUND :
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case TRY_AGAIN :
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case NO_RECOVERY :
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*error_num = h_errno;
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break;
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case NO_DATA :
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*error_num = NO_ADDRESS;
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break;
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default :
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*error_num = NO_RECOVERY;
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break;
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}
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return NULL;
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}
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tmp = copyhostent (tmp);
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if (tmp == NULL) {
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*error_num = TRY_AGAIN;
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return NULL;
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}
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return tmp;
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}
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