/* -*- 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

 */

//

// Example of the sending of a datagram to a broadcast address

//

// Network topology

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

//       |          |

//       n0    n1   n2   

//       |     |       

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

//

//   n0 originates UDP broadcast to 255.255.255.255/discard port, which 

//   is replicated and received on both n1 and n2

#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 ("CsmaBroadcastExample");

int 

main (int argc, char *argv[])

{

  // Users may find it convenient to turn on explicit debugging

  // for selected modules; the below lines suggest how to do this

#if 0

  LogComponentEnable ("CsmaBroadcastExample", LOG_LEVEL_INFO);

#endif

  LogComponentEnable ("CsmaBroadcastExample", LOG_PREFIX_TIME);

  //

  // Make the random number generators generate reproducible results.

  //

  RandomVariable::UseGlobalSeed (1, 1, 2, 3, 5, 8);

  // Allow the user to override any of the defaults and the above

  // Bind()s at run-time, via command-line arguments

  CommandLine cmd;

  cmd.Parse (argc, argv);

  NS_LOG_INFO ("Create nodes.");

  NodeContainer c;

  c.Create (3);

  NodeContainer c0 = NodeContainer (c.Get (0), c.Get (1));

  NodeContainer c1 = NodeContainer (c.Get (0), c.Get (2));

  NS_LOG_INFO ("Build Topology.");

  CsmaHelper csma;

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

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

  NetDeviceContainer n0 = csma.Install (c0);

  NetDeviceContainer n1 = csma.Install (c1);

  InternetStackHelper internet;

  internet.Install (c);

  NS_LOG_INFO ("Assign IP Addresses.");

  Ipv4AddressHelper ipv4;

  ipv4.SetBase ("10.1.0.0", "255.255.255.0");

  ipv4.Assign (n0);

  ipv4.SetBase ("192.168.1.0", "255.255.255.0");

  ipv4.Assign (n1);

  // RFC 863 discard port ("9") indicates packet should be thrown away

  // by the system.  We allow this silent discard to be overridden

  // by the PacketSink application.

  uint16_t port = 9;

  // Create the OnOff application to send UDP datagrams of size

  // 512 bytes (default) at a rate of 500 Kb/s (default) from n0

  NS_LOG_INFO ("Create Applications.");

  OnOffHelper onoff ("ns3::UdpSocketFactory", 

    Address (InetSocketAddress (Ipv4Address ("255.255.255.255"), port)));

  onoff.SetAttribute ("OnTime", RandomVariableValue (ConstantVariable (1)));

  onoff.SetAttribute ("OffTime", RandomVariableValue (ConstantVariable (0)));

  ApplicationContainer app = onoff.Install (c0.Get (0));

  // Start the application

  app.Start (Seconds (1.0));

  app.Stop (Seconds (10.0));

  // Create an optional packet sink to receive these packets

  PacketSinkHelper sink ("ns3::UdpSocketFactory",

    Address (InetSocketAddress (Ipv4Address::GetAny (), port)));

  sink.Install (c0.Get (1));

  sink.Install (c1.Get (1));

  // Also configure some tcpdump traces; each interface will be traced

  // The output files will be named 

  // csma-broadcast.pcap-<nodeId>-<interfaceId>

  // and can be read by the "tcpdump -tt -r" command 

  CsmaHelper::EnablePcapAll ("csma-broadcast");

  std::ofstream ascii;

  ascii.open ("csma-broadcast.tr");

  CsmaHelper::EnableAsciiAll (ascii);

  NS_LOG_INFO ("Run Simulation.");

  Simulator::Run ();    

  Simulator::Destroy ();

  NS_LOG_INFO ("Done.");

}