/* -*-	Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */

/*

 * Copyright (c) 2007 INRIA

 * All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation;

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 *

 * Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>

 */

#include "pcap-trace.h"

#include <sstream>

#include "ns3/config.h"

#include "ns3/callback.h"

#include "ns3/pcap-writer.h"

#include "ns3/node-list.h"

#include "ns3/node.h"

#include "ns3/packet.h"

#include "ns3/log.h"

#include "ipv4-l3-protocol.h"

NS_LOG_COMPONENT_DEFINE ("PcapTrace");

namespace ns3 {

PcapTrace::PcapTrace (std::string filename)

  : m_filename (filename)

{}

PcapTrace::~PcapTrace ()

{

  for (std::vector<Trace>::iterator i = m_traces.begin ();

       i != m_traces.end (); i++)

    {

      delete i->writer;

    }

}

void 

PcapTrace::TraceAllIp (void)

{

  Config::ConnectWithContext ("/NodeList/*/$Ipv4L3Protocol/Tx",

                              MakeCallback (&PcapTrace::LogTxIp, this));

  Config::ConnectWithContext ("/NodeList/*/$Ipv4L3Protocol/Rx",

                              MakeCallback (&PcapTrace::LogRxIp, this));

}

PcapWriter *

PcapTrace::GetStream (uint32_t nodeId, uint32_t interfaceId)

{

  for (std::vector<Trace>::iterator i = m_traces.begin ();

       i != m_traces.end (); i++)

    {

      if (i->nodeId == nodeId &&

	  i->interfaceId == interfaceId)

	{

	  return i->writer;

	}

    }

  PcapTrace::Trace trace;

  trace.nodeId = nodeId;

  trace.interfaceId = interfaceId;

  trace.writer = new PcapWriter ();

  std::ostringstream oss;

  oss << m_filename << "-" << nodeId << "-" << interfaceId;

  std::string filename = oss.str ();

  trace.writer->Open (filename);

  trace.writer->WriteIpHeader ();

  m_traces.push_back (trace);

  return trace.writer;

}

uint32_t

PcapTrace::GetNodeIndex (std::string context) const

{

  NS_ASSERT (pos == 0);

  std::string::size_type afterNodeIndex = context.find ("/", 11);

  NS_ASSERT (afterNodeIndex != std::string::npos);

  std::string index = context.substr (10, afterNodeIndex - 10);

  NS_LOG_DEBUG ("index="<<index);

  std::istringstream iss;

  iss.str (index);

  uint32_t nodeIndex;

  iss >> nodeIndex;

  return nodeIndex;

}  

void 

PcapTrace::LogTxIp (std::string context, Ptr<const Packet> p, uint32_t interfaceIndex)

{

  PcapWriter *writer = GetStream (GetNodeIndex (context), interfaceIndex);

  writer->WritePacket (p);

}

void 

PcapTrace::LogRxIp (std::string context, Ptr<const Packet> p, uint32_t interfaceIndex)

{

  PcapWriter *writer = GetStream (GetNodeIndex (context), interfaceIndex);

  writer->WritePacket (p);

}

}//namespace ns3