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

/*

 * Copyright 2007 University of Washington

 * 

 * 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:  Tom Henderson (tomhend@u.washington.edu)

 */

#include "ns3/address.h"

#include "ns3/log.h"

#include "ns3/inet-socket-address.h"

#include "ns3/node.h"

#include "ns3/socket.h"

#include "ns3/simulator.h"

#include "ns3/socket-factory.h"

#include "ns3/packet.h"

#include "ns3/trace-source-accessor.h"

#include "packet-sink.h"

using namespace std;

namespace ns3 {

NS_LOG_COMPONENT_DEFINE ("PacketSinkApplication");

NS_OBJECT_ENSURE_REGISTERED (PacketSink);

TypeId 

PacketSink::GetTypeId (void)

{

  static TypeId tid = TypeId ("ns3::PacketSink")

    .SetParent<Application> ()

    .AddConstructor<PacketSink> ()

    .AddAttribute ("Local", "The Address on which to Bind the rx socket.",

                   AddressValue (),

                   MakeAddressAccessor (&PacketSink::m_local),

                   MakeAddressChecker ())

    .AddAttribute ("Protocol", "The type id of the protocol to use for the rx socket.",

                   MakeTypeIdAccessor (&PacketSink::m_tid),

                   MakeTypeIdChecker ())

    .AddTraceSource ("Rx", "A packet has been received",

                     MakeTraceSourceAccessor (&PacketSink::m_rxTrace))

    ;

  return tid;

}

PacketSink::PacketSink ()

{

  m_socket = 0;

}

PacketSink::~PacketSink()

{}

void

PacketSink::DoDispose (void)

{

  m_socket = 0;

  // chain up

  Application::DoDispose ();

}

// Application Methods

void PacketSink::StartApplication()    // Called at time specified by Start

{

  // Create the socket if not already

  if (!m_socket)

    {

      m_socket = Socket::CreateSocket (GetNode(), m_tid);

      m_socket->Bind (m_local);

      m_socket->Listen (0);

    }

  m_socket->SetRecvCallback (MakeCallback(&PacketSink::HandleRead, this));

  m_socket->SetAcceptCallback (

            MakeNullCallback<bool, Ptr<Socket>, const Address &> (),

            MakeNullCallback<void, Ptr<Socket>, const Address&> (),

            MakeCallback(&PacketSink::CloseConnection, this) );

}

void PacketSink::StopApplication()     // Called at time specified by Stop

{

  if (m_socket) 

    {

      m_socket->SetRecvCallback (MakeNullCallback<void, Ptr<Socket> > ());

    }

}

void PacketSink::HandleRead (Ptr<Socket> socket)

{

  Ptr<Packet> packet;

  while (packet = socket->Recv ())

    {

      SocketRxAddressTag tag;

      bool found = packet->PeekTag (tag);

      NS_ASSERT (found);

      Address from = tag.GetAddress ();

      packet->RemoveTag (tag);

      if (InetSocketAddress::IsMatchingType (from))

        {

          InetSocketAddress address = InetSocketAddress::ConvertFrom (from);

          NS_LOG_INFO ("Received " << packet->GetSize() << " bytes from " << 

            address.GetIpv4() << " [" << address << "]---'" << 

            packet->PeekData() << "'");

        }    

      m_rxTrace (packet, from);

    }

}

void PacketSink::CloseConnection (Ptr<Socket> socket)

{

  socket->Close ();

}

} // Namespace ns3