/* -*- 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

 *

 */

// Test program for this 3-router scenario, using global routing

//

// (a.a.a.a/32)A<--x.x.x.0/30-->B<--y.y.y.0/30-->C(c.c.c.c/32)

#include <iostream>

#include <fstream>

#include <string>

#include <cassert>

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

#include "ns3/core-module.h"

#include "ns3/simulator-module.h"

#include "ns3/node-module.h"

#include "ns3/helper-module.h"

#include "ns3/ipv4-static-routing.h"

#include "ns3/ipv4-global-routing.h"

#include "ns3/ipv4-list-routing.h"

#include "ns3/ipv4-routing-table-entry.h"

#include "ns3/global-router-interface.h"

using namespace ns3;

using std::cout;

NS_LOG_COMPONENT_DEFINE ("GlobalRouterInjectionTest");

int 

main (int argc, char *argv[])

{

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

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

  CommandLine cmd;

  cmd.Parse (argc, argv);

  Ptr<Node> nA = CreateObject<Node> ();

  Ptr<Node> nB = CreateObject<Node> ();

  Ptr<Node> nC = CreateObject<Node> ();

  NodeContainer c = NodeContainer (nA, nB, nC);

  InternetStackHelper internet;

  // Point-to-point links

  NodeContainer nAnB = NodeContainer (nA, nB);

  NodeContainer nBnC = NodeContainer (nB, nC);

  internet.Install (nAnB);

  Ipv4ListRoutingHelper staticonly;

  Ipv4ListRoutingHelper staticRouting;

  staticonly.Add(staticRouting, 0);

  internet.SetRoutingHelper(staticonly);

  internet.Install(NodeContainer(nC));

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

  PointToPointHelper p2p;

  p2p.SetDeviceAttribute ("DataRate", StringValue ("5Mbps"));

  p2p.SetChannelAttribute ("Delay", StringValue ("2ms"));

  NetDeviceContainer dAdB = p2p.Install (nAnB);

  NetDeviceContainer dBdC = p2p.Install (nBnC);;

  Ptr<CsmaNetDevice> deviceA = CreateObject<CsmaNetDevice> ();

  deviceA->SetAddress (Mac48Address::Allocate ());

  nA->AddDevice (deviceA);

  Ptr<CsmaNetDevice> deviceC = CreateObject<CsmaNetDevice> ();

  deviceC->SetAddress (Mac48Address::Allocate ());

  nC->AddDevice (deviceC);

  // Later, we add IP addresses.  

  Ipv4AddressHelper ipv4;

  ipv4.SetBase ("10.1.1.0", "255.255.255.252");

  Ipv4InterfaceContainer iAiB = ipv4.Assign (dAdB);

  ipv4.SetBase ("10.1.1.4", "255.255.255.252");

  Ipv4InterfaceContainer iBiC = ipv4.Assign (dBdC);

  Ptr<Ipv4> ipv4A = nA->GetObject<Ipv4> ();

  Ptr<Ipv4> ipv4B = nB->GetObject<Ipv4> ();

  Ptr<Ipv4> ipv4C = nC->GetObject<Ipv4> ();

  int32_t ifIndexA = ipv4A->AddInterface (deviceA);

  int32_t ifIndexC = ipv4C->AddInterface (deviceC);

  Ipv4InterfaceAddress ifInAddrA = Ipv4InterfaceAddress (Ipv4Address ("172.16.1.1"), Ipv4Mask ("255.255.255.255"));

  ipv4A->AddAddress (ifIndexA, ifInAddrA);

  ipv4A->SetMetric (ifIndexA, 1);

  ipv4A->SetUp (ifIndexA);

  Ipv4InterfaceAddress ifInAddrC = Ipv4InterfaceAddress (Ipv4Address ("192.168.1.1"), Ipv4Mask ("255.255.255.255"));

  ipv4C->AddAddress (ifIndexC, ifInAddrC);

  ipv4C->SetMetric (ifIndexC, 1);

  ipv4C->SetUp (ifIndexC);

  // Create router nodes, initialize routing database and set up the routing

  // tables in the nodes.

  // Populate routing tables for nodes nA and nB

  Ipv4GlobalRoutingHelper::PopulateRoutingTables ();

  // Inject global routes from Node B, including transit network...

  Ptr<GlobalRouter> globalRouterB = nB->GetObject<GlobalRouter> ();

  globalRouterB->InjectRoute ("10.1.1.4", "255.255.255.252");

  // ...and the host in network "C"

  globalRouterB->InjectRoute ("192.168.1.1", "255.255.255.255");

  Ipv4GlobalRoutingHelper::RecomputeRoutingTables();

  // In addition, nB needs a static route to nC so it knows what to do with stuff

  // going to 192.168.1.1

  Ipv4StaticRoutingHelper ipv4RoutingHelper;

  Ptr<Ipv4StaticRouting> staticRoutingB = ipv4RoutingHelper.GetStaticRouting(ipv4B);

  staticRoutingB->AddHostRouteTo (Ipv4Address ("192.168.1.1"), Ipv4Address ("10.1.1.6"),2);

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

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

  uint16_t port = 9;   // Discard port (RFC 863)

  OnOffHelper onoff ("ns3::UdpSocketFactory", 

    Address (InetSocketAddress (ifInAddrC.GetLocal(), port)));

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

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

  onoff.SetAttribute ("DataRate", DataRateValue (DataRate (6000)));

  ApplicationContainer apps = onoff.Install (nA);

  apps.Start (Seconds (1.0));

  apps.Stop (Seconds (10.0));

  // Create a packet sink to receive these packets

  PacketSinkHelper sink ("ns3::UdpSocketFactory",

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

  apps = sink.Install (nC);

  apps.Start (Seconds (1.0));

  apps.Stop (Seconds (10.0));

  std::ofstream ascii;

  ascii.open ("global-routing-injection32.tr", std::ios_base::binary | std::ios_base::out);

  PointToPointHelper::EnableAsciiAll (ascii);

  Simulator::Run ();

  Simulator::Destroy ();

  return 0;

}