getnameinfo_verified.c revision 55682 
1/*
2 * Copyright (c) 1999 Kungliga Tekniska H�gskolan
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#ifdef HAVE_CONFIG_H
35#include <config.h>
36RCSID("$Id: getnameinfo_verified.c,v 1.2 1999/12/05 10:52:09 assar Exp $");
37#endif
38
39#include "roken.h"
40
41int
42getnameinfo_verified(const struct sockaddr *sa, socklen_t salen,
43		     char *host, size_t hostlen,
44		     char *serv, size_t servlen,
45		     int flags)
46{
47    int ret;
48    struct addrinfo *ai, *a;
49
50    if (host == NULL)
51	return EAI_NONAME;
52
53    ret = getnameinfo (sa, salen, host, hostlen, serv, servlen, flags);
54    if (ret)
55	return ret;
56    ret = getaddrinfo (host, serv, NULL, &ai);
57    if (ret)
58	return ret;
59    for (a = ai; a != NULL; a = a->ai_next) {
60	if (a->ai_addrlen == salen
61	    && memcmp (a->ai_addr, sa, salen) == 0)
62	    return 0;
63    }
64    if (flags & NI_NAMEREQD)
65	return EAI_NONAME;
66    ret = getnameinfo (sa, salen, host, hostlen, serv, servlen,
67		       flags | NI_NUMERICSERV | NI_NUMERICHOST);
68    return ret;
69}
70