/crypto/heimdal/lib/roken/getipnodebyname.c

 1/*
 2 * Copyright (c) 1999 Kungliga Tekniska Hรถgskolan
 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
39static 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
47ROKEN_LIB_FUNCTION struct hostent * ROKEN_LIB_CALL
48getipnodebyname (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}