File: FlowDtlsSocketContext.cxx

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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#ifdef USE_SSL
#include <asio.hpp>
#include <asio/ssl.hpp>
#include <boost/function.hpp>
#include <iostream>

#include <rutil/Log.hxx>
#include <rutil/Logger.hxx>
#include <rutil/Timer.hxx>

#include "FlowDtlsSocketContext.hxx"
#include "FlowManagerSubsystem.hxx"

using namespace flowmanager;
using namespace resip;
using namespace dtls;
using namespace std;

#define RESIPROCATE_SUBSYSTEM FlowManagerSubsystem::FLOWMANAGER

FlowDtlsSocketContext::FlowDtlsSocketContext(Flow& flow, const asio::ip::address& address, unsigned short port) 
   : mFlow(flow), mAddress(address), mPort(port), mSrtpInitialized(false)
{
}

FlowDtlsSocketContext::~FlowDtlsSocketContext() 
{
   if(mSrtpInitialized)
   {
      // Free the master key memory allocated in DtlsSocket::createSrtpSessionPolicies
      delete mSRTPPolicyIn.key;
      delete mSRTPPolicyOut.key;
   }
}

void 
FlowDtlsSocketContext::write(const unsigned char* data, unsigned int len)
{
   InfoLog(<< "Dtls write to " << mAddress.to_string() << ":" << mPort << " called.  ComponentId=" << mFlow.getComponentId());
   mFlow.rawSendTo(mAddress, mPort, (const char*)data, len);
}

void 
FlowDtlsSocketContext::handshakeCompleted()
{
   InfoLog(<< "Flow Dtls Handshake Completed!  ComponentId=" << mFlow.getComponentId());

   char fprint[100];
   SRTP_PROTECTION_PROFILE *srtp_profile;
   int r;

   if(mSocket->getRemoteFingerprint(fprint))
   {
      Data remoteSDPFingerprint = mFlow.getRemoteSDPFingerprint();
      if(!remoteSDPFingerprint.empty())
      {
         if(!mSocket->checkFingerprint(remoteSDPFingerprint.c_str(), remoteSDPFingerprint.size()))
         {
            InfoLog(<< "Remote fingerprint = " << fprint << " is not valid!  ComponentId=" << mFlow.getComponentId());
            return;
         }
         else
         {
            InfoLog(<< "Remote fingerprint = " << fprint << " is valid!  ComponentId=" << mFlow.getComponentId());
         }
      }
      else
      {
         InfoLog(<< "Remote fingerprint = " << fprint << "  ComponentId=" << mFlow.getComponentId());
      }
   } 
   else
   {
      InfoLog(<< "Remote fingerprint cannot be obtained from Dtls handshake.  ComponentId=" << mFlow.getComponentId());
      return; 
   }

   srtp_profile=mSocket->getSrtpProfile();

   if(srtp_profile)
   {
      InfoLog(<< "SRTP Extension negotiated profile=" << srtp_profile->name << "  ComponentId=" << mFlow.getComponentId());
   }

   // !slg! TODO - we should probably be basing the policy creation off of what is returned from getSrtpProfile
   mSocket->createSrtpSessionPolicies(mSRTPPolicyOut, mSRTPPolicyIn);

   r=srtp_create(&mSRTPSessionIn, &mSRTPPolicyIn);   
   assert(r==0);
   r=srtp_create(&mSRTPSessionOut, &mSRTPPolicyOut);
   assert(r==0);
   mSrtpInitialized = true;
}
 
void 
FlowDtlsSocketContext::handshakeFailed(const char *err)
{
   ErrLog(<< "Flow Dtls Handshake failed!  ComponentId=" << mFlow.getComponentId());
}

void FlowDtlsSocketContext::fingerprintMismatch()
{
   // Ensure Srtp is not initalized, so the will not process media packets from this endpoint
   if(mSrtpInitialized)
   {
      // Free the master key memory allocated in DtlsSocket::createSrtpSessionPolicies
      delete mSRTPPolicyIn.key;
      delete mSRTPPolicyOut.key;
   }
   mSrtpInitialized = false;
}

err_status_t 
FlowDtlsSocketContext::srtpProtect(void* data, int* size, bool rtcp)
{
   err_status_t status = err_status_no_ctx;
   if(mSrtpInitialized)
   {
      if(rtcp)
      {
         status = srtp_protect_rtcp(mSRTPSessionOut, data, size);  
      }
      else
      {
         status = srtp_protect(mSRTPSessionOut, data, size);  
      }
   }
   return status;
}

err_status_t 
FlowDtlsSocketContext::srtpUnprotect(void* data, int* size, bool rtcp)
{
   err_status_t status = err_status_no_ctx;
   if(mSrtpInitialized)
   {
      if(rtcp)
      {
         status = srtp_unprotect_rtcp(mSRTPSessionIn, data, size);  
      }
      else
      {
         status = srtp_unprotect(mSRTPSessionIn, data, size);  
      }
   }
   return status;
}

#endif 
/* ====================================================================

 Copyright (c) 2007-2008, Plantronics, Inc.
 All rights reserved.

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 modification, are permitted provided that the following conditions are 
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    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 Plantronics 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 COPYRIGHT HOLDERS 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 COPYRIGHT 
 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
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