/* -*- 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

//

// - UDP flows from n0 to n1 and back

// - DropTail queues 

// - Tracing of queues and packet receptions to file "udp-echo.tr"

#include "ns3/command-line.h"

#include "ns3/default-value.h"

#include "ns3/ptr.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/ipv4-address.h"

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

#include "ns3/ipv4.h"

#include "ns3/socket.h"

#include "ns3/ipv4-route.h"

#include "ns3/udp-echo-client.h"

#include "ns3/udp-echo-server.h"

using namespace ns3;

NS_DEBUG_COMPONENT_DEFINE ("UdpEcho");

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("UdpEcho");

  DebugComponentEnable("Object");

  DebugComponentEnable("Queue");

  DebugComponentEnable("DropTailQueue");

  DebugComponentEnable("Channel");

  DebugComponentEnable("CsmaChannel");

  DebugComponentEnable("CsmaNetDevice");

  DebugComponentEnable("Ipv4L3Protocol");

  DebugComponentEnable("NetDevice");

  DebugComponentEnable("PacketSocket");

  DebugComponentEnable("OnOffApplication");

  DebugComponentEnable("Socket");

  DebugComponentEnable("UdpSocket");

  DebugComponentEnable("UdpL4Protocol");

  DebugComponentEnable("Ipv4L3Protocol");

  DebugComponentEnable("Ipv4StaticRouting");

  DebugComponentEnable("Ipv4Interface");

  DebugComponentEnable("ArpIpv4Interface");

  DebugComponentEnable("Ipv4LoopbackInterface");

  DebugComponentEnable("UdpEchoClient");

  DebugComponentEnable("UdpEchoServer");

#endif

  DebugComponentEnable("UdpEcho");

  DebugComponentEnable("UdpEchoClient");

  DebugComponentEnable("UdpEchoServer");

//

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

// technique to tell the system what subclass of Queue to use.  The Bind

// command 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() at

// run-time, via command-line arguments

//

  CommandLine::Parse (argc, argv);

//

// Explicitly create the nodes required by the topology (shown above).

//

  NS_DEBUG("Create nodes.");

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

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

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

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

  NS_DEBUG("Create channels.");

//

// Explicitly create the channels required by the topology (shown above).

//

  Ptr<CsmaChannel> lan = CsmaTopology::CreateCsmaChannel(

    DataRate(5000000), MilliSeconds(2));

  NS_DEBUG("Build Topology.");

//

// Now fill out the topology by creating the net devices required to connect

// the nodes to the channels and hooking them up.  AddIpv4CsmaNetDevice will

// create a net device, add a MAC address (in memory of the pink flamingo) and

// connect the net device to a nodes and also to a channel. the 

// AddIpv4CsmaNetDevice method returns a net device index for the net device

// created on the node.  Interpret nd0 as the net device we created for node

// zero.

//

  uint32_t nd0 = CsmaIpv4Topology::AddIpv4CsmaNetDevice (n0, lan, 

  uint32_t nd1 = CsmaIpv4Topology::AddIpv4CsmaNetDevice (n1, lan, 

  uint32_t nd2 = CsmaIpv4Topology::AddIpv4CsmaNetDevice (n2, lan, 

  uint32_t nd3 = CsmaIpv4Topology::AddIpv4CsmaNetDevice (n3, lan, 

//

// We've got the "hardware" in place.  Now we need to add IP addresses.

//

  NS_DEBUG("Assign IP Addresses.");

//

// XXX BUGBUG

// Need a better way to get the interface index.  The point-to-point topology

// as implemented can't return the index since it creates interfaces on both

// sides (i.e., it does AddIpv4Addresses, not AddIpv4Address).  We need a

// method on Ipv4 to find the interface index corresponding to a given ipv4 

// address.

//

// Assign IP addresses to the net devices and associated interfaces

// on the lan.  The AddIpv4Address method returns an Ipv4 interface index

// which we do not need here.

//

  CsmaIpv4Topology::AddIpv4Address (n0, nd0, Ipv4Address("10.1.1.1"), 

    Ipv4Mask("255.255.255.0"));

  CsmaIpv4Topology::AddIpv4Address (n1, nd1, Ipv4Address("10.1.1.2"), 

    Ipv4Mask("255.255.255.0"));

  CsmaIpv4Topology::AddIpv4Address (n2, nd2, Ipv4Address("10.1.1.3"), 

    Ipv4Mask("255.255.255.0"));

  CsmaIpv4Topology::AddIpv4Address (n3, nd3, Ipv4Address("10.1.1.4"), 

    Ipv4Mask("255.255.255.0"));

  NS_DEBUG("Create Applications.");

//

// Create a UdpEchoServer application on node one.

//

  uint16_t port = 80;

  Ptr<UdpEchoServer> server = Create<UdpEchoServer> (n1, port);

//

// Create a UdpEchoClient application to send UDP datagrams from node zero to

// node one.

//

  uint32_t packetSize = 1024;

  uint32_t maxPacketCount = 1;

  Time interPacketInterval = Seconds (1.);

  Ptr<UdpEchoClient> client = Create<UdpEchoClient> (n0, "10.1.1.2", port, 

    maxPacketCount, interPacketInterval, packetSize);

//

// Tell the applications when to start and stop.

//

  server->Start(Seconds(1.));

  client->Start(Seconds(2.));

  server->Stop (Seconds(10.));

  client->Stop (Seconds(10.));

//

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

// Trace output will be sent to the file "udp-echo.tr"

//

  NS_DEBUG("Configure Tracing.");

  AsciiTrace asciitrace ("udp-echo.tr");

  asciitrace.TraceAllNetDeviceRx ();

  asciitrace.TraceAllQueues ();

//

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

// The output files will be named:

//     udp-echo.pcap-<nodeId>-<interfaceId>

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

// display timestamps correctly)

//

  PcapTrace pcaptrace ("udp-echo.pcap");

  pcaptrace.TraceAllIp ();

//

// Now, do the actual simulation.

//

  NS_DEBUG("Run Simulation.");

  Simulator::Run ();

  Simulator::Destroy ();

  NS_DEBUG("Done.");

}