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