getipnodebyaddr.c revision 178826 
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>
36RCSID("$Id: getipnodebyaddr.c 14773 2005-04-12 11:29:18Z lha $");
37#endif
38
39#include "roken.h"
40
41/*
42 * lookup `src, len' (address family `af') in DNS and return a pointer
43 * to a malloced struct hostent or NULL.
44 */
45
46struct hostent * ROKEN_LIB_FUNCTION
47getipnodebyaddr (const void *src, size_t len, int af, int *error_num)
48{
49    struct hostent *tmp;
50
51    tmp = gethostbyaddr (src, len, af);
52    if (tmp == NULL) {
53	switch (h_errno) {
54	case HOST_NOT_FOUND :
55	case TRY_AGAIN :
56	case NO_RECOVERY :
57	    *error_num = h_errno;
58	    break;
59	case NO_DATA :
60	    *error_num = NO_ADDRESS;
61	    break;
62	default :
63	    *error_num = NO_RECOVERY;
64	    break;
65	}
66	return NULL;
67    }
68    tmp = copyhostent (tmp);
69    if (tmp == NULL) {
70	*error_num = TRY_AGAIN;
71	return NULL;
72    }
73    return tmp;
74}
75