/* -*- 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

//

//       n0    n1   n2   n3

//       |     |    |    |

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

//              LAN

//

// - Pcap traces are saved as tcp-nsc-zoo-$n-0.pcap, where $n represents the node number

// - TCP flows from n0 to n1, n2, n3, from n1 to n0, n2, n3, etc.

//  Usage (e.g.): ./waf --run 'tcp-nsc-zoo --nodes=5'

#include <iostream>

#include <string>

#include "ns3/core-module.h"

#include "ns3/helper-module.h"

#include "ns3/node-module.h"

#include "ns3/simulator-module.h"

using namespace ns3;

NS_LOG_COMPONENT_DEFINE ("TcpNscZoo");

// Simulates a diverse network with various stacks supported by NSC.

int main(int argc, char *argv[])

{

  CsmaHelper csma;

  unsigned int MaxNodes = 4;

  unsigned int runtime = 3;

  Config::SetDefault ("ns3::OnOffApplication::PacketSize", UintegerValue (2048));

  Config::SetDefault ("ns3::OnOffApplication::DataRate", StringValue ("8kbps"));

  CommandLine cmd;

  // this allows the user to raise the number of nodes using --nodes=X command-line argument.

  cmd.AddValue("nodes", "Number of nodes in the network (must be > 1)", MaxNodes);

  cmd.AddValue("runtime", "How long the applications should send data (default 3 seconds)", runtime);

  cmd.Parse (argc, argv);

  if (MaxNodes < 2)

    {

       std::cerr << "--nodes: must be >= 2" << std::endl;

       return 1;

    }

  csma.SetChannelAttribute ("DataRate", DataRateValue (DataRate(100 * 1000 * 1000)));

  csma.SetChannelAttribute ("Delay", TimeValue (MicroSeconds (200)));

  NodeContainer n;

  n.Create(MaxNodes);

  NetDeviceContainer ethInterfaces = csma.Install (n);

  InternetStackHelper internetStack;

  internetStack.SetTcp ("ns3::NscTcpL4Protocol","Library",StringValue("liblinux2.6.26.so"));

  // this switches nodes 0 and 1 to NSCs Linux 2.6.26 stack.

  internetStack.Install (n.Get(0));

  internetStack.Install (n.Get(1));

  // this disables TCP SACK, wscale and timestamps on node 1 (the attributes represent sysctl-values).

  Config::Set ("/NodeList/1/$ns3::Ns3NscStack<linux2.6.26>/net.ipv4.tcp_sack", StringValue ("0"));

  Config::Set ("/NodeList/1/$ns3::Ns3NscStack<linux2.6.26>/net.ipv4.tcp_timestamps", StringValue ("0"));

  Config::Set ("/NodeList/1/$ns3::Ns3NscStack<linux2.6.26>/net.ipv4.tcp_window_scaling", StringValue ("0"));

  if (MaxNodes > 2)

    {

      internetStack.Install (n.Get(2));

    }

  if (MaxNodes > 3)

    {

      // the next statement doesn't change anything for the nodes 0, 1, and 2; since they

      // already have a stack assigned.

      internetStack.SetTcp ("ns3::NscTcpL4Protocol","Library",StringValue("liblinux2.6.18.so"));

      // this switches node 3 to NSCs Linux 2.6.18 stack.

      internetStack.Install (n.Get(3));

      // and then agains disables sack/timestamps/wscale on node 3.

      Config::Set ("/NodeList/3/$ns3::Ns3NscStack<linux2.6.18>/net.ipv4.tcp_sack", StringValue ("0"));

      Config::Set ("/NodeList/3/$ns3::Ns3NscStack<linux2.6.18>/net.ipv4.tcp_timestamps", StringValue ("0"));

      Config::Set ("/NodeList/3/$ns3::Ns3NscStack<linux2.6.18>/net.ipv4.tcp_window_scaling", StringValue ("0"));

    }

  // the freebsd stack is not yet built by default, so its commented out for now.

  // internetStack.SetNscStack ("libfreebsd5.so");

  for (unsigned int i =4; i < MaxNodes; i++)

    {

      internetStack.Install (n.Get(i));

    }

  Ipv4AddressHelper ipv4;

  ipv4.SetBase ("10.0.0.0", "255.255.255.0");

  Ipv4InterfaceContainer ipv4Interfaces = ipv4.Assign (ethInterfaces);

  Ipv4GlobalRoutingHelper::PopulateRoutingTables ();

  uint16_t servPort = 8080;

  PacketSinkHelper sinkHelper ("ns3::TcpSocketFactory", InetSocketAddress (Ipv4Address::GetAny (), servPort));

  // start a sink client on all nodes

  ApplicationContainer sinkApp = sinkHelper.Install (n);

  sinkApp.Start (Seconds (0));

  sinkApp.Stop (Seconds (30.0));

  // This tells every node on the network to start a flow to all other nodes on the network ...

  for (unsigned int i = 0 ; i < MaxNodes;i++)

    {

      for (unsigned int j = 0 ; j < MaxNodes;j++)

        {

          if (i == j)

            {  // ...but we don't want a node to talk to itself.

               continue;

            }

          Address remoteAddress(InetSocketAddress(ipv4Interfaces.GetAddress (j), servPort));

          OnOffHelper clientHelper ("ns3::TcpSocketFactory", remoteAddress);

          clientHelper.SetAttribute 

            ("OnTime", RandomVariableValue (ConstantVariable (1)));

          clientHelper.SetAttribute 

            ("OffTime", RandomVariableValue (ConstantVariable (0)));

          ApplicationContainer clientApp = clientHelper.Install(n.Get(i));

          clientApp.Start (Seconds (j)); /* delay startup depending on node number */

          clientApp.Stop (Seconds (j + runtime));

	}

    }

  CsmaHelper::EnablePcapAll ("tcp-nsc-zoo", false);

  Simulator::Stop (Seconds(100));

  Simulator::Run ();

  Simulator::Destroy ();

  return 0;

}