1 /*	$NetBSD: getipnodebyname.c,v 1.1.1.1 2011/04/13 18:15:41 elric 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 #ifndef HAVE_H_ERRNO
41 static int h_errno = NO_RECOVERY;
42 #endif
43 
44 /*
45  * lookup `name' (address family `af') in DNS and return a pointer
46  * to a malloced struct hostent or NULL.
47  */
48 
49 ROKEN_LIB_FUNCTION struct hostent * ROKEN_LIB_CALL
50 getipnodebyname (const char *name, int af, int flags, int *error_num)
51 {
52     struct hostent *tmp;
53 
54 #ifdef HAVE_GETHOSTBYNAME2
55     tmp = gethostbyname2 (name, af);
56 #else
57     if (af != AF_INET) {
58 	*error_num = NO_ADDRESS;
59 	return NULL;
60     }
61     tmp = gethostbyname (name);
62 #endif
63     if (tmp == NULL) {
64 	switch (h_errno) {
65 	case HOST_NOT_FOUND :
66 	case TRY_AGAIN :
67 	case NO_RECOVERY :
68 	    *error_num = h_errno;
69 	    break;
70 	case NO_DATA :
71 	    *error_num = NO_ADDRESS;
72 	    break;
73 	default :
74 	    *error_num = NO_RECOVERY;
75 	    break;
76 	}
77 	return NULL;
78     }
79     tmp = copyhostent (tmp);
80     if (tmp == NULL) {
81 	*error_num = TRY_AGAIN;
82 	return NULL;
83     }
84     return tmp;
85 }
86