/* -*- 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

//       |               |

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

//              LAN

//

// - UDP flows from n0 to n1

#include <fstream>

#include "ns3/core-module.h"

#include "ns3/csma-module.h"

#include "ns3/applications-module.h"

#include "ns3/internet-module.h"

#include "ns3/network-module.h"

using namespace ns3;

NS_LOG_COMPONENT_DEFINE ("SocketOptionsIpv4");

void ReceivePacket (Ptr<Socket> socket)

{

  NS_LOG_INFO ("Received one packet!");

  Ptr<Packet> packet = socket->Recv ();

  SocketIpTosTag tosTag;

  if (packet->RemovePacketTag (tosTag))

    {

      NS_LOG_INFO (" TOS = " << (uint32_t)tosTag.GetTos ());

    }

  SocketIpTtlTag ttlTag;

  if (packet->RemovePacketTag (ttlTag))

    {

      NS_LOG_INFO (" TTL = " << (uint32_t)ttlTag.GetTtl ());

    }

}

static void SendPacket (Ptr<Socket> socket, uint32_t pktSize, 

                        uint32_t pktCount, Time pktInterval )

{

  if (pktCount > 0)

    {

      socket->Send (Create<Packet> (pktSize));

      Simulator::Schedule (pktInterval, &SendPacket, 

                           socket, pktSize,pktCount - 1, pktInterval);

    }

  else

    {

      socket->Close ();

    }

}

int 

main (int argc, char *argv[])

{

//

// Allow the user to override any of the defaults and the above Bind() at

// run-time, via command-line arguments

//

  uint32_t packetSize = 1024;

  uint32_t packetCount = 10;

  double packetInterval = 1.0;

  //Socket options for IPv4, currently TOS, TTL, RECVTOS, and RECVTTL

  uint32_t ipTos = 0;

  bool ipRecvTos = true;

  uint32_t ipTtl = 0;

  bool ipRecvTtl = true;

  CommandLine cmd;

  cmd.AddValue ("PacketSize", "Packet size in bytes", packetSize);

  cmd.AddValue ("PacketCount", "Number of packets to send", packetCount);

  cmd.AddValue ("Interval", "Interval between packets", packetInterval);

  cmd.AddValue ("IP_TOS", "IP_TOS", ipTos);

  cmd.AddValue ("IP_RECVTOS", "IP_RECVTOS", ipRecvTos);

  cmd.AddValue ("IP_TTL", "IP_TTL", ipTtl);

  cmd.AddValue ("IP_RECVTTL", "IP_RECVTTL", ipRecvTtl);

  cmd.Parse (argc, argv);

  NS_LOG_INFO ("Create nodes.");

  NodeContainer n;

  n.Create (2);

  InternetStackHelper internet;

  internet.Install (n);

  Address serverAddress;

  NS_LOG_INFO ("Create channels.");

  CsmaHelper csma;

  csma.SetChannelAttribute ("DataRate", DataRateValue (DataRate (5000000)));

  csma.SetChannelAttribute ("Delay", TimeValue (MilliSeconds (2)));

  csma.SetDeviceAttribute ("Mtu", UintegerValue (1400));

  NetDeviceContainer d = csma.Install (n);

  NS_LOG_INFO ("Assign IP Addresses.");

  Ipv4AddressHelper ipv4;

  ipv4.SetBase ("10.1.1.0", "255.255.255.0");

  Ipv4InterfaceContainer i = ipv4.Assign (d);

  serverAddress = Address(i.GetAddress (1));

  NS_LOG_INFO ("Create sockets.");

  //Receiver socket on n1

  TypeId tid = TypeId::LookupByName ("ns3::UdpSocketFactory");

  Ptr<Socket> recvSink = Socket::CreateSocket (n.Get (1), tid);

  InetSocketAddress local = InetSocketAddress (Ipv4Address::GetAny (), 4477);

  recvSink->SetIpRecvTos (ipRecvTos);

  recvSink->SetIpRecvTtl (ipRecvTtl);

  recvSink->Bind (local);

  recvSink->SetRecvCallback (MakeCallback (&ReceivePacket));

  //Sender socket on n0

  Ptr<Socket> source = Socket::CreateSocket (n.Get (0), tid);

  InetSocketAddress remote = InetSocketAddress (i.GetAddress (1), 4477);

  //Set socket options, it is also possible to set the options after the socket has been created/connected.

  if (ipTos > 0)

    {

      source->SetIpTos (ipTos);

    }

  if (ipTtl > 0)

    {

      source->SetIpTtl (ipTtl);

    }

  source->Connect (remote);

  AsciiTraceHelper ascii;

  csma.EnableAsciiAll (ascii.CreateFileStream ("socket-options-ipv4.tr"));

  csma.EnablePcapAll ("socket-options-ipv4", false);

  //Schedule SendPacket

  Time interPacketInterval = Seconds (packetInterval);

  Simulator::ScheduleWithContext (source->GetNode ()->GetId (),

                                  Seconds (1.0), &SendPacket, 

                                  source, packetSize, packetCount, interPacketInterval);

  NS_LOG_INFO ("Run Simulation.");

  Simulator::Run ();

  Simulator::Destroy ();

  NS_LOG_INFO ("Done.");

}