RROverlay.cxx

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#if defined(HAVE_CONFIG_H)
#include "config.h"
#endif

#include "AresCompat.hxx"

#ifndef __CYGWIN__
#ifndef RRFIXEDSZ
#define RRFIXEDSZ 10
#endif
#ifndef NS_RRFIXEDSZ
#define NS_RRFIXEDSZ 10
#endif
#endif

#include <cstdlib>
#include <vector>
#include "rutil/Data.hxx"
#include "rutil/BaseException.hxx"
#include "RROverlay.hxx"

using namespace resip;
using namespace std;

#define RESIPROCATE_SUBSYSTEM Subsystem::DNS

// aptr - points to the begining of the resource record.
// abuf - points to the begining of the message.
// alen - length of abuf.
RROverlay::RROverlay(const unsigned char *aptr,
                     const unsigned char *abuf,
                     int alen) : 
   mData(0),
   mMsg(0),
   mMsgLen(0),
   mDataLen(0),
   mNameLen(0),
   mTTL(0),
   mType(-1)
{
   char *name;
   long len = 0;

   // Parse the RR name. 
   int status = ares_expand_name(aptr, abuf, alen, &name, &len);
   if (status != ARES_SUCCESS)
   {
      throw OverlayException("Failed parse of RR", __FILE__, __LINE__);
   }
   mDomain = name;
   aptr += len;
   mNameLen = len;
   free(name);
      
   // Make sure there is enough data after the RR name for the fixed
   // part of the RR.
   if (aptr + RRFIXEDSZ > abuf + alen)
   {
      throw OverlayException("Failed parse of RR", __FILE__, __LINE__);
   }
   
   // Parse the fixed part of the RR, and advance to the RR data field. 
   //
   mType = DNS_RR_TYPE(aptr);
   mDataLen = DNS_RR_LEN(aptr);
   mTTL = DNS_RR_TTL(aptr);
   
   aptr += RRFIXEDSZ;
   if (aptr + mDataLen > abuf + alen)
   {
      throw OverlayException("Failed parse of RR", __FILE__, __LINE__);
   }

   mData = aptr;
   mMsgLen = alen;
   mMsg = abuf;
   aptr += mDataLen;
}

/* ====================================================================
 * The Vovida Software License, Version 1.0 
 * 
 * Copyright (c) 2000-2005 Vovida Networks, Inc.  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. The names "VOCAL", "Vovida Open Communication Application Library",
 *    and "Vovida Open Communication Application Library (VOCAL)" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact vocal@vovida.org.
 *
 * 4. Products derived from this software may not be called "VOCAL", nor
 *    may "VOCAL" appear in their name, without prior written
 *    permission of Vovida Networks, Inc.
 * 
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE AND
 * NON-INFRINGEMENT ARE DISCLAIMED.  IN NO EVENT SHALL VOVIDA
 * NETWORKS, INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT DAMAGES
 * IN EXCESS OF $1,000, NOR FOR ANY 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.
 * 
 * ====================================================================
 * 
 * This software consists of voluntary contributions made by Vovida
 * Networks, Inc. and many individuals on behalf of Vovida Networks,
 * Inc.  For more information on Vovida Networks, Inc., please see
 * <http://www.vovida.org/>.
 *
 */