dhcp-example.cc

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2011 UPB
 * Copyright (c) 2017 NITK Surathkal
 *
 * 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
 *
 * Author: Radu Lupu <rlupu@elcom.pub.ro>
 *         Ankit Deepak <adadeepak8@gmail.com>
 *         Deepti Rajagopal <deeptir96@gmail.com>
 *
 */
 
/*
 * Network layout:
 *
 * R0 is a DHCP server. The DHCP server announced R1 as the default router.
 * Nodes N1 will send UDP Echo packets to node A.
 *
 *
 *                ┌-------------------------------------------------┐
 *                | DHCP Clients                                    |
 *                |                                   172.30.0.14   |
 *                |                                   DHCP static   |
 *                |   ┌──────┐       ┌──────┐        ┌──────┐       |
 *                |   │  N0  │       │  N1  │        │  N2  │       |            ┌──────┐
 *                |   └──────┘       └──────┘        └──────┘       |       ┌────│  A   │
 *                |       │              │               │          |       │    └──────┘
 *                └-------│--------------│---------------│----------┘       │  172.30.1.2
 *  DHCP Server           │              │               │                  │
 *        ┌──────┐        │              │               │      ┌──────┐    │
 *        │  R0  │────────┴──────────────┴───────────────┴──────│  R1  │────┘
 *        └──────┘                                              └──────┘172.30.1.1
 *          172.30.0.12                                  172.30.0.17
 *
 * Things to notice:
 * 1) The routes in A are manually set to have R1 as the default router,
 *    just because using a dynamic outing in this example is an overkill.
 * 2) R1's address is set statically though the DHCP server helper interface.
 *    This is useful to prevent address conflicts with the dynamic pool.
 *    Not necessary if the DHCP pool is not conflicting with static addresses.
 * 3) N2 has a dynamically-assigned, static address (i.e., a fixed address assigned via DHCP).
 *
 */
 
#include "ns3/core-module.h"
#include "ns3/internet-apps-module.h"
#include "ns3/csma-module.h"
#include "ns3/internet-module.h"
#include "ns3/point-to-point-module.h"
#include "ns3/applications-module.h"
 
using namespace ns3;
 
NS_LOG_COMPONENT_DEFINE ("DhcpExample");
 
int
main (int argc, char *argv[])
{
  CommandLine cmd (__FILE__);
 
  bool verbose = false;
  bool tracing = false;
  cmd.AddValue ("verbose", "turn on the logs", verbose);
  cmd.AddValue ("tracing", "turn on the tracing", tracing);
 
  cmd.Parse (argc, argv);
 
  // GlobalValue::Bind ("ChecksumEnabled", BooleanValue (true));
 
  if (verbose)
    {
      LogComponentEnable ("DhcpServer", LOG_LEVEL_ALL);
      LogComponentEnable ("DhcpClient", LOG_LEVEL_ALL);
      LogComponentEnable ("UdpEchoServerApplication", LOG_LEVEL_INFO);
      LogComponentEnable ("UdpEchoClientApplication", LOG_LEVEL_INFO);
    }
 
  Time stopTime = Seconds (20);
 
  NS_LOG_INFO ("Create nodes.");
  NodeContainer nodes;
  NodeContainer router;
  nodes.Create (3);
  router.Create (2);
 
  NodeContainer net (nodes, router);
 
  NS_LOG_INFO ("Create channels.");
  CsmaHelper csma;
  csma.SetChannelAttribute ("DataRate", StringValue ("5Mbps"));
  csma.SetChannelAttribute ("Delay", StringValue ("2ms"));
  csma.SetDeviceAttribute ("Mtu", UintegerValue (1500));
  NetDeviceContainer devNet = csma.Install (net);
 
  NodeContainer p2pNodes;
  p2pNodes.Add (net.Get (4));
  p2pNodes.Create (1);
 
  PointToPointHelper pointToPoint;
  pointToPoint.SetDeviceAttribute ("DataRate", StringValue ("5Mbps"));
  pointToPoint.SetChannelAttribute ("Delay", StringValue ("2ms"));
 
  NetDeviceContainer p2pDevices;
  p2pDevices = pointToPoint.Install (p2pNodes);
 
  InternetStackHelper tcpip;
  tcpip.Install (nodes);
  tcpip.Install (router);
  tcpip.Install (p2pNodes.Get (1));
 
  Ipv4AddressHelper address;
  address.SetBase ("172.30.1.0", "255.255.255.0");
  Ipv4InterfaceContainer p2pInterfaces;
  p2pInterfaces = address.Assign (p2pDevices);
 
  // manually add a routing entry because we don't want to add a dynamic routing
  Ipv4StaticRoutingHelper ipv4RoutingHelper;
  Ptr<Ipv4> ipv4Ptr = p2pNodes.Get (1)->GetObject<Ipv4> ();
  Ptr<Ipv4StaticRouting> staticRoutingA = ipv4RoutingHelper.GetStaticRouting (ipv4Ptr);
  staticRoutingA->AddNetworkRouteTo (Ipv4Address ("172.30.0.0"), Ipv4Mask ("/24"),
                                     Ipv4Address ("172.30.1.1"), 1);
 
  NS_LOG_INFO ("Setup the IP addresses and create DHCP applications.");
  DhcpHelper dhcpHelper;
 
  // The router must have a fixed IP.
  Ipv4InterfaceContainer fixedNodes = dhcpHelper.InstallFixedAddress (devNet.Get (4), Ipv4Address ("172.30.0.17"), Ipv4Mask ("/24"));
  // Not really necessary, IP forwarding is enabled by default in IPv4.
  fixedNodes.Get (0).first->SetAttribute ("IpForward", BooleanValue (true));
 
  // DHCP server
  ApplicationContainer dhcpServerApp = dhcpHelper.InstallDhcpServer (devNet.Get (3), Ipv4Address ("172.30.0.12"),
                                                                     Ipv4Address ("172.30.0.0"), Ipv4Mask ("/24"),
                                                                     Ipv4Address ("172.30.0.10"), Ipv4Address ("172.30.0.15"),
                                                                     Ipv4Address ("172.30.0.17"));
 
  // This is just to show how it can be done.
  DynamicCast<DhcpServer> (dhcpServerApp.Get (0))->AddStaticDhcpEntry (devNet.Get (2)->GetAddress (), Ipv4Address ("172.30.0.14"));
 
  dhcpServerApp.Start (Seconds (0.0));
  dhcpServerApp.Stop (stopTime);
 
  // DHCP clients
  NetDeviceContainer dhcpClientNetDevs;
  dhcpClientNetDevs.Add (devNet.Get (0));
  dhcpClientNetDevs.Add (devNet.Get (1));
  dhcpClientNetDevs.Add (devNet.Get (2));
 
  ApplicationContainer dhcpClients = dhcpHelper.InstallDhcpClient (dhcpClientNetDevs);
  dhcpClients.Start (Seconds (1.0));
  dhcpClients.Stop (stopTime);
 
  UdpEchoServerHelper echoServer (9);
 
  ApplicationContainer serverApps = echoServer.Install (p2pNodes.Get (1));
  serverApps.Start (Seconds (0.0));
  serverApps.Stop (stopTime);
 
  UdpEchoClientHelper echoClient (p2pInterfaces.GetAddress (1), 9);
  echoClient.SetAttribute ("MaxPackets", UintegerValue (100));
  echoClient.SetAttribute ("Interval", TimeValue (Seconds (1.0)));
  echoClient.SetAttribute ("PacketSize", UintegerValue (1024));
 
  ApplicationContainer clientApps = echoClient.Install (nodes.Get (1));
  clientApps.Start (Seconds (10.0));
  clientApps.Stop (stopTime);
 
  Simulator::Stop (stopTime + Seconds (10.0));
 
  if (tracing)
    {
      csma.EnablePcapAll ("dhcp-csma");
      pointToPoint.EnablePcapAll ("dhcp-p2p");
    }
 
  NS_LOG_INFO ("Run Simulation.");
  Simulator::Run ();
  Simulator::Destroy ();
  NS_LOG_INFO ("Done.");
}