/* -*- 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/command-line.h"

#include "ns3/default-value.h"

#include "ns3/ptr.h"

#include "ns3/random-variable.h"

#include "ns3/debug.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/csma-channel.h"

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

#include "ns3/csma-topology.h"

#include "ns3/csma-ipv4-topology.h"

#include "ns3/eui48-address.h"

#include "ns3/ipv4-address.h"

#include "ns3/inet-socket-address.h"

#include "ns3/ipv4.h"

#include "ns3/socket.h"

#include "ns3/ipv4-route.h"

#include "ns3/onoff-application.h"

using namespace ns3;

{

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

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

#if 0 

  DebugComponentEnable("CsmaNetDevice");

  DebugComponentEnable("Ipv4L3Protocol");

  DebugComponentEnable("NetDevice");

  DebugComponentEnable("CsmaChannel");

  // 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

  DefaultValue::Bind ("Queue", "DropTailQueue");

  // 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<Node> n0 = Create<InternetNode> ();

  Ptr<Node> n1 = Create<InternetNode> (); 

  Ptr<Node> n2 = Create<InternetNode> (); 

  Ptr<Node> n3 = Create<InternetNode> ();

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

  Ptr<CsmaChannel> channel0 = 

    CsmaTopology::CreateCsmaChannel(

      DataRate(5000000), MilliSeconds(2));

  uint32_t n0ifIndex = CsmaIpv4Topology::AddIpv4CsmaNode (n0, channel0, 

                                         Eui48Address("10:54:23:54:23:50"));

  uint32_t n1ifIndex = CsmaIpv4Topology::AddIpv4CsmaNode (n1, channel0,

                                         Eui48Address("10:54:23:54:23:51"));

  uint32_t n2ifIndex = CsmaIpv4Topology::AddIpv4CsmaNode (n2, channel0,

                                         Eui48Address("10:54:23:54:23:52"));

  uint32_t n3ifIndex = CsmaIpv4Topology::AddIpv4CsmaNode (n3, channel0,

                                         Eui48Address("10:54:23:54:23:53"));

  // Later, we add IP addresses.  

  CsmaIpv4Topology::AddIpv4Address (

      n0, n0ifIndex, Ipv4Address("10.1.1.1"), Ipv4Mask("255.255.255.0"));

  CsmaIpv4Topology::AddIpv4Address (

      n1, n1ifIndex, Ipv4Address("10.1.1.2"), Ipv4Mask("255.255.255.0"));

  CsmaIpv4Topology::AddIpv4Address (

      n2, n2ifIndex, Ipv4Address("10.1.1.3"), Ipv4Mask("255.255.255.0"));

  CsmaIpv4Topology::AddIpv4Address (

      n3, n3ifIndex, Ipv4Address("10.1.1.4"), Ipv4Mask("255.255.255.0"));

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

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

  // from n0 to n1

  Ptr<OnOffApplication> ooff = Create<OnOffApplication> (

    n0, 

    InetSocketAddress ("10.1.1.2", 80), 

    "Udp",

    ConstantVariable(1), 

    ConstantVariable(0));

  // Start the application

  ooff->Start(Seconds(1.0));

  ooff->Stop (Seconds(10.0));

  // Create a similar flow from n3 to n0, starting at time 1.1 seconds

  ooff = Create<OnOffApplication> (

    n3, 

    InetSocketAddress ("10.1.1.1", 80), 

    "Udp",

    ConstantVariable(1), 

    ConstantVariable(0));

  // Start the application

  ooff->Start(Seconds(1.1));

  ooff->Stop (Seconds(10.0));

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

  // Trace output will be sent to the csma-one-subnet.tr file

  AsciiTrace asciitrace ("csma-one-subnet.tr");

  asciitrace.TraceAllNetDeviceRx ();

  asciitrace.TraceAllQueues ();

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

  // The output files will be named 

  // simple-point-to-point.pcap-<nodeId>-<interfaceId>

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

  // display timestamps correctly)

  PcapTrace pcaptrace ("csma-one-subnet.pcap");

  pcaptrace.TraceAllIp ();

  Simulator::Run ();

  Simulator::Destroy ();

}