1 /* $NetBSD: getipnodebyaddr.c,v 1.2 2017/01/28 21:31:50 christos Exp $ */
2
3 /*
4 * Copyright (c) 1999 Kungliga Tekniska Högskolan
5 * (Royal Institute of Technology, Stockholm, Sweden).
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * 3. Neither the name of the Institute nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include <config.h>
37
38 #include <krb5/roken.h>
39
40 /*
41 * lookup `src, len' (address family `af') in DNS and return a pointer
42 * to a malloced struct hostent or NULL.
43 */
44
45 ROKEN_LIB_FUNCTION struct hostent * ROKEN_LIB_CALL
getipnodebyaddr(const void * src,size_t len,int af,int * error_num)46 getipnodebyaddr (const void *src, size_t len, int af, int *error_num)
47 {
48 struct hostent *tmp;
49
50 tmp = gethostbyaddr (src, len, af);
51 if (tmp == NULL) {
52 switch (h_errno) {
53 case HOST_NOT_FOUND :
54 case TRY_AGAIN :
55 case NO_RECOVERY :
56 *error_num = h_errno;
57 break;
58 case NO_DATA :
59 *error_num = NO_ADDRESS;
60 break;
61 default :
62 *error_num = NO_RECOVERY;
63 break;
64 }
65 return NULL;
66 }
67 tmp = copyhostent (tmp);
68 if (tmp == NULL) {
69 *error_num = TRY_AGAIN;
70 return NULL;
71 }
72 return tmp;
73 }
74