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/*
* Copyright (c) 1999 - 2002 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
RCSID("$Id: getnameinfo_verified.c,v 1.6 2002/09/05 01:36:27 assar Exp $");
#endif
#include "roken.h"
/*
* Try to obtain a verified name for the address in `sa, salen' (much
* similar to getnameinfo).
* Verified in this context means that forwards and backwards lookups
* in DNS are consistent. If that fails, return an error if the
* NI_NAMEREQD flag is set or return the numeric address as a string.
*/
int
getnameinfo_verified(const struct sockaddr *sa, socklen_t salen,
char *host, size_t hostlen,
char *serv, size_t servlen,
int flags)
{
int ret;
struct addrinfo *ai, *a;
char servbuf[NI_MAXSERV];
struct addrinfo hints;
if (host == NULL)
return EAI_NONAME;
if (serv == NULL) {
serv = servbuf;
servlen = sizeof(servbuf);
}
ret = getnameinfo (sa, salen, host, hostlen, serv, servlen,
flags | NI_NUMERICSERV);
if (ret)
goto fail;
memset (&hints, 0, sizeof(hints));
hints.ai_socktype = SOCK_STREAM;
ret = getaddrinfo (host, serv, &hints, &ai);
if (ret)
goto fail;
for (a = ai; a != NULL; a = a->ai_next) {
if (a->ai_addrlen == salen
&& memcmp (a->ai_addr, sa, salen) == 0) {
freeaddrinfo (ai);
return 0;
}
}
freeaddrinfo (ai);
fail:
if (flags & NI_NAMEREQD)
return EAI_NONAME;
ret = getnameinfo (sa, salen, host, hostlen, serv, servlen,
flags | NI_NUMERICSERV | NI_NUMERICHOST);
return ret;
}
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