/* -*- 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

 *

 * ns-2 simple.tcl script (ported from ns-2)

 * Originally authored by Steve McCanne, 12/19/1996

 */

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

//

// Network topology

//

//  n0

//     \ 5 Mb/s, 2ms

//      \          1.5Mb/s, 10ms

//       n2 -------------------------n3

//      /

//     / 5 Mb/s, 2ms

//   n1

//

// - all links are p2p links with indicated one-way BW/delay

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

// - FTP/TCP flow from n0 to n3, starting at time 1.2 to time 1.35 sec.

// - 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 "simple-p2p.tr"

#include <iostream>

#include <fstream>

#include <string>

#include <cassert>

#include "ns3/debug.h"

#include "ns3/command-line.h"

#include "ns3/default-value.h"

#include "ns3/ptr.h"

#include "ns3/simulator.h"

#include "ns3/nstime.h"

#include "ns3/data-rate.h"

#include "ns3/ascii-trace.h"

#include "ns3/pcap-trace.h"

#include "ns3/internet-node.h"

#include "ns3/p2p-channel.h"

#include "ns3/p2p-net-device.h"

#include "ns3/mac-address.h"

#include "ns3/ipv4-address.h"

#include "ns3/i-ipv4.h"

#include "ns3/socket.h"

#include "ns3/ipv4-route.h"

#include "ns3/drop-tail.h"

#include "ns3/node-list.h"

#include "ns3/trace-root.h"

#include "ns3/p2p-topology.h"

#include "ns3/onoff-application.h"

#include "ns3/random-variable.h"

using namespace ns3;

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 

  DebugComponentEnable("Object");

  DebugComponentEnable("Queue");

  DebugComponentEnable("DropTailQueue");

  DebugComponentEnable("Channel");

  DebugComponentEnable("PointToPointChannel");

  DebugComponentEnable("PointToPointNetDevice");

#endif

  // Set up some default values for the simulation.  Use the Bind()

  // technique to tell the system what subclass of Queue to use,

  // and what the queue limit is

  // The below Bind command tells the queue factory which class to

  // instantiate, when the queue factory is invoked in the topology code

  //Bind ("DropTailQueue::m_maxPackets", 30);   

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

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

  CommandLine::Parse (argc, argv);

  // Here, we will explicitly create four nodes.  In more sophisticated

  // topologies, we could configure a node factory.

  Ptr<INode> n0 = MakeInternetNode ();

  Ptr<INode> n1 = MakeInternetNode (); 

  Ptr<INode> n2 = MakeInternetNode (); 

  Ptr<INode> n3 = MakeInternetNode ();

  // We create the channels first without any IP addressing information

  Ptr<PointToPointChannel> channel0 = 

    PointToPointTopology::AddPointToPointLink (

      n0, n2, DataRate(5000000), MilliSeconds(2));

  Ptr<PointToPointChannel> channel1 = 

    PointToPointTopology::AddPointToPointLink (

      n1, n2, DataRate(5000000), MilliSeconds(2));

  Ptr<PointToPointChannel> channel2 = 

    PointToPointTopology::AddPointToPointLink (

      n2, n3, DataRate(1500000), MilliSeconds(10));

  // Later, we add IP addresses.  

  PointToPointTopology::AddIpv4Addresses (

      channel0, n0, Ipv4Address("10.1.1.1"),

      n2, Ipv4Address("10.1.1.2"));

  PointToPointTopology::AddIpv4Addresses (

      channel1, n1, Ipv4Address("10.1.2.1"),

      n2, Ipv4Address("10.1.2.2"));

  PointToPointTopology::AddIpv4Addresses (

      channel2, n2, Ipv4Address("10.1.3.1"),

      n3, Ipv4Address("10.1.3.2"));

  // Finally, we add static routes.  These three steps (Channel and

  // NetDevice creation, IP Address assignment, and routing) are 

  // separated because there may be a need to postpone IP Address

  // assignment (emulation) or modify to use dynamic routing

  PointToPointTopology::AddIpv4Routes(n0, n2, channel0);

  PointToPointTopology::AddIpv4Routes(n1, n2, channel1);

  PointToPointTopology::AddIpv4Routes(n2, n3, channel2);

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

  // 210 bytes at a rate of 448 Kb/s

  Ptr<OnOffApplication> ooff = MakeNewObject<OnOffApplication> (

    n0, 

    Ipv4Address("10.1.3.2"), 

    80, 

    ConstantVariable(1), 

  // Start the application

  ooff->Start(Seconds(1.0));

  ooff->Stop (Seconds(10.0));

  // Create a similar flow from n3 to n1, starting at time 1.1 seconds

  ooff = MakeNewObject<OnOffApplication> (

    n3, 

    Ipv4Address("10.1.2.1"), 

    80, 

    ConstantVariable(1), 

  // Start the application

  ooff->Start(Seconds(1.1));

  ooff->Stop (Seconds(10.0));

  // Here, finish off packet routing configuration

  // This will likely set by some global StaticRouting object in the future

  Ptr<IIpv4> ipv4;

  ipv4 = n0->QueryInterface<IIpv4> (IIpv4::iid);

  ipv4->SetDefaultRoute (Ipv4Address ("10.1.1.2"), 1);

  ipv4 = n3->QueryInterface<IIpv4> (IIpv4::iid);

  ipv4->SetDefaultRoute (Ipv4Address ("10.1.3.1"), 1);

  // Configure tracing of all enqueue, dequeue, and NetDevice receive events

  // Trace output will be sent to the simple-p2p.tr file

  AsciiTrace asciitrace ("simple-p2p.tr");

  asciitrace.TraceAllQueues ();

  asciitrace.TraceAllNetDeviceRx ();

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

  // The output files will be named simple-p2p.pcap-<nodeId>-<interfaceId>

  // and can be read by the "tcpdump -r" command (use "-tt" option to

  // display timestamps correctly)

  PcapTrace pcaptrace ("simple-p2p.pcap");

  pcaptrace.TraceAllIp ();

  Simulator::Run ();

  Simulator::Destroy ();

}