/* -*- 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

 */

// Port of ns-2/tcl/ex/simple.tcl to ns-3

//

// Network topology

//

//       n0    n1   n2   n3

//       |     |    |    |

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

//

// - CBR/UDP flows from n0 to n1, and from n3 to n0

// - UDP packet size of 210 bytes, with per-packet interval 0.00375 sec.

//   (i.e., DataRate of 448,000 bps)

// - DropTail queues 

// - Tracing of queues and packet receptions to file "csma-one-subnet.tr"

#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 ("CsmaPingExample");

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

{

  //std::cout << *p << std::endl;

}

static void PingRtt (std::string context, Time rtt)

{

  //std::cout << context << " " << rtt << std::endl;

}

int

main (int argc, char *argv[])

{

  CommandLine cmd;

  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);

  // setup global router

  Ipv4GlobalRoutingHelper::PopulateRoutingTables ();

  NS_LOG_INFO ("Create Source");

  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 (15000)));

  onoff.SetAttribute ("PacketSize", UintegerValue (1200));

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

  apps.Start (Seconds (1.0));

  apps.Stop (Seconds (10.0));

  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 (11.0));

  NS_LOG_INFO ("Create pinger");

  V4PingHelper ping = V4PingHelper (addresses.GetAddress (2));

  NodeContainer pingers;

  pingers.Add (c.Get (0));

  pingers.Add (c.Get (1));

  pingers.Add (c.Get (3));

  apps = ping.Install (pingers);

  apps.Start (Seconds (2.0));

  apps.Stop (Seconds (5.0));

  NS_LOG_INFO ("Configure Tracing.");

  // first, pcap tracing in non-promiscuous mode

  csma.EnablePcapAll ("csma-ping", false);

  // then, print what the packet sink receives.

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

                                 MakeCallback (&SinkRx));

  // finally, print the ping rtts.

  Config::Connect ("/NodeList/*/ApplicationList/*/$ns3::V4Ping/Rtt",

                   MakeCallback (&PingRtt));

  Packet::EnablePrinting ();

  NS_LOG_INFO ("Run Simulation.");

  Simulator::Run ();

  Simulator::Destroy ();

  NS_LOG_INFO ("Done.");

}