1 /*
2  * Copyright (c) 1999 Kungliga Tekniska Högskolan
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 #include <config.h>
35 
36 #include "roken.h"
37 
38 /*
39  * lookup `src, len' (address family `af') in DNS and return a pointer
40  * to a malloced struct hostent or NULL.
41  */
42 
43 ROKEN_LIB_FUNCTION struct hostent * ROKEN_LIB_CALL
44 getipnodebyaddr (const void *src, size_t len, int af, int *error_num)
45 {
46     struct hostent *tmp;
47 
48     tmp = gethostbyaddr (src, len, af);
49     if (tmp == NULL) {
50 	switch (h_errno) {
51 	case HOST_NOT_FOUND :
52 	case TRY_AGAIN :
53 	case NO_RECOVERY :
54 	    *error_num = h_errno;
55 	    break;
56 	case NO_DATA :
57 	    *error_num = NO_ADDRESS;
58 	    break;
59 	default :
60 	    *error_num = NO_RECOVERY;
61 	    break;
62 	}
63 	return NULL;
64     }
65     tmp = copyhostent (tmp);
66     if (tmp == NULL) {
67 	*error_num = TRY_AGAIN;
68 	return NULL;
69     }
70     return tmp;
71 }
72