/* -*-  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

 *

 * Authors: Lalith Suresh <suresh.lalith@gmail.com>

 *

 */

// 

// This script, adapted from examples/wireless/wifi-simple-adhoc illustrates

// the use of OLSR HNA.

// 

// Network Topology:

//

//             |------ OLSR ------|   |---- non-OLSR ----|

//           A ))))            (((( B ------------------- C

//           10.1.1.1     10.1.1.2   172.16.1.2     172.16.1.1

//

// Node A needs to send a UDP packet to node C. This can be done only after

// A receives an HNA message from B, in which B announces 172.16.1.0/24

// as an associated network.

//

// If no HNA message is generated by B, a will not be able to form a route to C.

// This can be verified as follows:

//

// ./waf --run olsr-hna

//

// There are two ways to make a node to generate HNA messages.

//

// One way is to use olsr::RoutingProtocol::SetRoutingTableAssociation ()

// to use which you may run:

//

// ./waf --run "olsr-hna --assocMethod1=1"

//

// The other way is to use olsr::RoutingProtocol::AddHostNetworkAssociation ()

// to use which you may run:

//

// ./waf --run "olsr-hna --assocMethod2=1"

//

#include "ns3/core-module.h"

#include "ns3/network-module.h"

#include "ns3/mobility-module.h"

#include "ns3/config-store-module.h"

#include "ns3/wifi-module.h"

#include "ns3/csma-module.h"

#include "ns3/internet-module.h"

#include "ns3/olsr-routing-protocol.h"

#include "ns3/olsr-helper.h"

#include <iostream>

#include <fstream>

#include <vector>

#include <string>

NS_LOG_COMPONENT_DEFINE ("OlsrHna");

using namespace ns3;

void ReceivePacket (Ptr<Socket> socket)

{

  NS_LOG_UNCOND ("Received one packet!");

}

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

                             uint32_t pktCount, Time pktInterval )

{

  if (pktCount > 0)

    {

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

      Simulator::Schedule (pktInterval, &GenerateTraffic, 

    }

  else

    {

      socket->Close ();

    }

}

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

{

  std::string phyMode ("DsssRate1Mbps");

  double rss = -80;  // -dBm

  uint32_t packetSize = 1000; // bytes

  uint32_t numPackets = 1;

  double interval = 1.0; // seconds

  bool verbose = false;

  bool assocMethod1 = false;

  bool assocMethod2 = false;

  CommandLine cmd;

  cmd.AddValue ("phyMode", "Wifi Phy mode", phyMode);

  cmd.AddValue ("rss", "received signal strength", rss);

  cmd.AddValue ("packetSize", "size of application packet sent", packetSize);

  cmd.AddValue ("numPackets", "number of packets generated", numPackets);

  cmd.AddValue ("interval", "interval (seconds) between packets", interval);

  cmd.AddValue ("verbose", "turn on all WifiNetDevice log components", verbose);

  cmd.AddValue ("assocMethod1", "Use SetRoutingTableAssociation () method", assocMethod1);

  cmd.AddValue ("assocMethod2", "Use AddHostNetworkAssociation () method", assocMethod2);

  cmd.Parse (argc, argv);

  // Convert to time object

  Time interPacketInterval = Seconds (interval);

  // disable fragmentation for frames below 2200 bytes

  Config::SetDefault ("ns3::WifiRemoteStationManager::FragmentationThreshold", StringValue ("2200"));

  // turn off RTS/CTS for frames below 2200 bytes

  Config::SetDefault ("ns3::WifiRemoteStationManager::RtsCtsThreshold", StringValue ("2200"));

  // Fix non-unicast data rate to be the same as that of unicast

  Config::SetDefault ("ns3::WifiRemoteStationManager::NonUnicastMode", 

                      StringValue (phyMode));

  NodeContainer olsrNodes;

  olsrNodes.Create (2);

  NodeContainer csmaNodes;

  csmaNodes.Create (1);

  // The below set of helpers will help us to put together the wifi NICs we want

  WifiHelper wifi;

  if (verbose)

    {

      wifi.EnableLogComponents ();  // Turn on all Wifi logging

    }

  wifi.SetStandard (WIFI_PHY_STANDARD_80211b);

  YansWifiPhyHelper wifiPhy =  YansWifiPhyHelper::Default ();

  // This is one parameter that matters when using FixedRssLossModel

  // set it to zero; otherwise, gain will be added

  wifiPhy.Set ("RxGain", DoubleValue (0) ); 

  // ns-3 supports RadioTap and Prism tracing extensions for 802.11b

  wifiPhy.SetPcapDataLinkType (YansWifiPhyHelper::DLT_IEEE802_11_RADIO);

  YansWifiChannelHelper wifiChannel ;

  wifiChannel.SetPropagationDelay ("ns3::ConstantSpeedPropagationDelayModel");

  // The below FixedRssLossModel will cause the rss to be fixed regardless

  // of the distance between the two stations, and the transmit power

  wifiChannel.AddPropagationLoss ("ns3::FixedRssLossModel","Rss",DoubleValue(rss));

  wifiPhy.SetChannel (wifiChannel.Create ());

  // Add a non-QoS upper mac, and disable rate control

  NqosWifiMacHelper wifiMac = NqosWifiMacHelper::Default ();

  wifi.SetRemoteStationManager ("ns3::ConstantRateWifiManager",

                                "DataMode",StringValue(phyMode),

  // Set it to adhoc mode

  wifiMac.SetType ("ns3::AdhocWifiMac");

  NetDeviceContainer devices = wifi.Install (wifiPhy, wifiMac, olsrNodes);

  CsmaHelper csma;

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

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

  NetDeviceContainer csmaDevices = csma.Install (NodeContainer (csmaNodes.Get(0), olsrNodes.Get(1)));

  // Note that with FixedRssLossModel, the positions below are not 

  // used for received signal strength. 

  MobilityHelper mobility;

  Ptr<ListPositionAllocator> positionAlloc = CreateObject<ListPositionAllocator> ();

  positionAlloc->Add (Vector (0.0, 0.0, 0.0));

  positionAlloc->Add (Vector (5.0, 0.0, 0.0));

  mobility.SetPositionAllocator (positionAlloc);

  mobility.SetMobilityModel ("ns3::ConstantPositionMobilityModel");

  mobility.Install (olsrNodes);

  OlsrHelper olsr;

  // Specify Node B's csma device as a non-OLSR device.

  olsr.ExcludeInterface (olsrNodes.Get (1), 2);

  Ipv4StaticRoutingHelper staticRouting;

  Ipv4ListRoutingHelper list;

  list.Add (staticRouting, 0);

  list.Add (olsr, 10);

  InternetStackHelper internet_olsr;

  internet_olsr.SetRoutingHelper (list); // has effect on the next Install ()

  internet_olsr.Install (olsrNodes);

  InternetStackHelper internet_csma;

  internet_csma.Install (csmaNodes);

  Ipv4AddressHelper ipv4;

  NS_LOG_INFO ("Assign IP Addresses.");

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

  ipv4.Assign (devices);

  ipv4.SetBase ("172.16.1.0", "255.255.255.0");

  ipv4.Assign (csmaDevices);

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

  Ptr<Socket> recvSink = Socket::CreateSocket (csmaNodes.Get(0), tid);

  InetSocketAddress local = InetSocketAddress (Ipv4Address::GetAny (), 80);

  recvSink->Bind (local);

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

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

  InetSocketAddress remote = InetSocketAddress (Ipv4Address ("172.16.1.1"), 80);

  source->Connect (remote);

  // Obtain olsr::RoutingProtocol instance of gateway node

  // (namely, node B) and add the required association

  Ptr<Ipv4RoutingProtocol> rp_Gw = (stack->GetRoutingProtocol ());

  Ptr<Ipv4ListRouting> lrp_Gw = DynamicCast<Ipv4ListRouting> (rp_Gw);

  Ptr<olsr::RoutingProtocol> olsrrp_Gw;

  for (uint32_t i = 0; i < lrp_Gw->GetNRoutingProtocols ();  i++)

    {

      int16_t priority;

      Ptr<Ipv4RoutingProtocol> temp = lrp_Gw->GetRoutingProtocol (i, priority);

      if (DynamicCast<olsr::RoutingProtocol> (temp))

        {

          olsrrp_Gw = DynamicCast<olsr::RoutingProtocol> (temp);

        }

    }

  if (assocMethod1)

    {

      // Create a special Ipv4StaticRouting instance for RoutingTableAssociation

      // Even the Ipv4StaticRouting instance added to list may be used

      Ptr<Ipv4StaticRouting> hnaEntries = Create<Ipv4StaticRouting> ();

      // Add the required routes into the Ipv4StaticRouting Protocol instance

      // and have the node generate HNA messages for all these routes

      // which are associated with non-OLSR interfaces specified above.

      hnaEntries->AddNetworkRouteTo (Ipv4Address ("172.16.1.0"), Ipv4Mask ("255.255.255.0"), uint32_t(2), uint32_t(1));

      olsrrp_Gw->SetRoutingTableAssociation (hnaEntries);

    }

  if (assocMethod2)

    {

      // Specify the required associations directly.

      olsrrp_Gw->AddHostNetworkAssociation (Ipv4Address ("172.16.1.0"), Ipv4Mask ("255.255.255.0"));

    }

  // Tracing

  wifiPhy.EnablePcap ("olsr-hna", devices);

  csma.EnablePcap ("olsr-hna", csmaDevices, false);

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

                                  Seconds (15.0), &GenerateTraffic, 

                                  source, packetSize, numPackets, interPacketInterval);

  Simulator::Stop (Seconds (20.0));

  Simulator::Run ();

  Simulator::Destroy ();

  return 0;

}