6937d41a02
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@23815 ec53bebd-3082-4978-b11e-865c3cabbd6b
93 lines
3.0 KiB
C
93 lines
3.0 KiB
C
/*
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* Copyright (c) 1999 - 2002 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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RCSID("$Id$");
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#endif
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#include "roken.h"
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/*
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* Try to obtain a verified name for the address in `sa, salen' (much
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* similar to getnameinfo).
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* Verified in this context means that forwards and backwards lookups
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* in DNS are consistent. If that fails, return an error if the
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* NI_NAMEREQD flag is set or return the numeric address as a string.
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*/
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int ROKEN_LIB_FUNCTION
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getnameinfo_verified(const struct sockaddr *sa, socklen_t salen,
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char *host, size_t hostlen,
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char *serv, size_t servlen,
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int flags)
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{
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int ret;
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struct addrinfo *ai, *a;
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char servbuf[NI_MAXSERV];
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struct addrinfo hints;
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if (host == NULL)
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return EAI_NONAME;
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if (serv == NULL) {
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serv = servbuf;
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servlen = sizeof(servbuf);
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}
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ret = getnameinfo (sa, salen, host, hostlen, serv, servlen,
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flags | NI_NUMERICSERV);
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if (ret)
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goto fail;
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memset (&hints, 0, sizeof(hints));
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hints.ai_socktype = SOCK_STREAM;
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ret = getaddrinfo (host, serv, &hints, &ai);
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if (ret)
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goto fail;
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for (a = ai; a != NULL; a = a->ai_next) {
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if (a->ai_addrlen == salen
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&& memcmp (a->ai_addr, sa, salen) == 0) {
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freeaddrinfo (ai);
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return 0;
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}
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}
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freeaddrinfo (ai);
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fail:
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if (flags & NI_NAMEREQD)
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return EAI_NONAME;
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ret = getnameinfo (sa, salen, host, hostlen, serv, servlen,
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flags | NI_NUMERICSERV | NI_NUMERICHOST);
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return ret;
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}
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