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

/*

 * 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

 */

//

// Network topology

//    (sender)         (receiver)

//       n0    n1   n2   n3

//       |     |    |    |

//     =====================

//

// Node n0 sends data to node n3 over a raw IP socket.  The protocol

// number used is 2.

// The default traffic rate is to send 1250 bytes/second for 10 kb/s 

// The data rate can be toggled by command line argument

#include <iostream>

#include <fstream>

#include <string>

#include <cassert>

#include "ns3/core-module.h"

#include "ns3/simulator-module.h"

#include "ns3/node-module.h"

#include "ns3/helper-module.h"

using namespace ns3;

NS_LOG_COMPONENT_DEFINE ("CsmaPacketSocketExample");

static void SinkRx (Ptr<const Packet> p, const Address &ad)

{

  // Enable the below line to see the packet contents printed out at the

  // receive sink

  //std::cout << Simulator::Now().GetSeconds () << " " << *p << std::endl;

}

int

main (int argc, char *argv[])

{

#if 0 

  LogComponentEnable ("CsmaPacketSocketExample", LOG_LEVEL_INFO);

#endif

  uint32_t dataRate = 10;

  CommandLine cmd;

  cmd.AddValue ("dataRate", "application dataRate (Kb/s)", dataRate);

  cmd.Parse (argc, argv);

  // Here, we will explicitly create four nodes.

  NS_LOG_INFO ("Create nodes.");

  NodeContainer c;

  c.Create (4);

  // connect all our nodes to a shared channel.

  NS_LOG_INFO ("Build Topology.");

  CsmaHelper csma;

  csma.SetChannelAttribute ("DataRate", DataRateValue (DataRate (5000000)));

  csma.SetChannelAttribute ("Delay", TimeValue (MilliSeconds (2)));

  csma.SetDeviceAttribute ("EncapsulationMode", StringValue ("Llc"));

  NetDeviceContainer devs = csma.Install (c);

  // add an ip stack to all nodes.

  NS_LOG_INFO ("Add ip stack.");

  InternetStackHelper ipStack;

  ipStack.Install (c);

  // assign ip addresses

  NS_LOG_INFO ("Assign ip addresses.");

  Ipv4AddressHelper ip;

  ip.SetBase ("192.168.1.0", "255.255.255.0");

  Ipv4InterfaceContainer addresses = ip.Assign (devs);

  NS_LOG_INFO ("Create Source");

  // IP protocol configuration

  Config::SetDefault ("ns3::Ipv4RawSocketImpl::Protocol", StringValue ("2"));

  InetSocketAddress dst = InetSocketAddress (addresses.GetAddress (3));

  OnOffHelper onoff = OnOffHelper ("ns3::Ipv4RawSocketFactory", dst);

  onoff.SetAttribute ("OnTime", RandomVariableValue (ConstantVariable (1.0)));

  onoff.SetAttribute ("OffTime", RandomVariableValue (ConstantVariable (0.0)));

  onoff.SetAttribute ("DataRate", DataRateValue (DataRate (dataRate*1000)));

  onoff.SetAttribute ("PacketSize", UintegerValue (1250));

  ApplicationContainer apps = onoff.Install (c.Get (0));

  apps.Start (Seconds (0.5));

  apps.Stop (Seconds (11));

  NS_LOG_INFO ("Create Sink.");

  PacketSinkHelper sink = PacketSinkHelper ("ns3::Ipv4RawSocketFactory", dst);

  apps = sink.Install (c.Get (3));

  apps.Start (Seconds (0.0));

  apps.Stop (Seconds (12.0));

  NS_LOG_INFO ("Configure Tracing.");

  // first, pcap tracing in non-promiscuous mode

  csma.EnablePcapAll ("csma-raw-ip-socket", false);

  // then, print what the packet sink receives.

  Config::ConnectWithoutContext ("/NodeList/3/ApplicationList/0/$ns3::PacketSink/Rx", 

                                 MakeCallback (&SinkRx));

  Packet::EnablePrinting ();

  NS_LOG_INFO ("Run Simulation.");

  Simulator::Run ();

  Simulator::Destroy ();

  NS_LOG_INFO ("Done.");

}