158 lines
5.4 KiB
C++
158 lines
5.4 KiB
C++
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation;
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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// Network topology
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//
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// Normally, the use case for emulated net devices is in collections of
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// small simulations that connect to the outside world through specific
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// interfaces. For example, one could construct a number of virtual
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// machines and connect them via a host-only network. To use the emulated
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// net device, you would need to set all of the host-only interfaces in
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// promiscuous mode and provide an appropriate device name (search for "eth1"
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// below). One could also use the emulated net device in a testbed situation
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// where the host on which the simulation is running has a specific interface
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// of interested. You would also need to set this specific interface into
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// promiscuous mode and provide an appropriate device name.
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//
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// This philosophy carries over to this simple example.
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//
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// We don't assume any special configuration and all of the ns-3 emulated net
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// devices will actually talk to the same underlying OS device. We rely on
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// the fact that the OS will deliver copies of our packets to the other ns-3
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// net devices since we operate in promiscuous mode.
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//
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// Packets will be sent out over the device, but we use MAC spoofing. The
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// MAC addresses will be generated using the Organizationally Unique Identifier
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// (OUI) 00:00:00 as a base. This vendor code is not assigned to any
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// organization and so should not conflict with any real hardware. We'll use
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// the first n of these addresses, where n is the number of nodes, in this
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// simualtion. It is up to you to determine that using these MAC addresses is
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// okay on your network and won't conflict with anything else (including another
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// simulation using emu devices) on your network. Once you have made this
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// determination, you need to put the interface you chose into promiscuous mode.
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// We don't do it for you since you need to think about it first.
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//
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// This simulation uses the real-time simulator and so will consume ten seconds
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// of real time.
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//
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// By default, we create the following topology
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//
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// n0 n1 n2 n3
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// | | | |
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// -----------------
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// "eth1"
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//
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// - UDP flows from n0 to n1 and back
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// - DropTail queues
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// - Tracing of queues and packet receptions to file "udp-echo.tr"
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// - pcap tracing on all devices
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//
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#include <fstream>
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#include "ns3/core-module.h"
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#include "ns3/simulator-module.h"
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#include "ns3/helper-module.h"
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#include "ns3/emu-helper.h"
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using namespace ns3;
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NS_LOG_COMPONENT_DEFINE ("EmulatedUdpEchoExample");
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int
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main (int argc, char *argv[])
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{
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std::string deviceName ("eth1");
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uint32_t nNodes = 4;
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//
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// Allow the user to override any of the defaults at run-time, via command-line
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// arguments
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//
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CommandLine cmd;
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cmd.AddValue("deviceName", "device name", deviceName);
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cmd.AddValue("nNodes", "number of nodes to create (>= 2)", nNodes);
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cmd.Parse (argc, argv);
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GlobalValue::Bind ("SimulatorImplementationType",
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StringValue ("ns3::RealtimeSimulatorImpl"));
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//
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// need at least two nodes
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//
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nNodes = nNodes < 2 ? 2 : nNodes;
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//
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// Explicitly create the nodes required by the topology (shown above).
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//
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NS_LOG_INFO ("Create nodes.");
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NodeContainer n;
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n.Create (nNodes);
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InternetStackHelper internet;
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internet.Install (n);
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//
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// Explicitly create the channels required by the topology (shown above).
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//
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NS_LOG_INFO ("Create channels.");
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EmuHelper emu;
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emu.SetAttribute ("DeviceName", StringValue (deviceName));
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NetDeviceContainer d = emu.Install (n);
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//
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// We've got the "hardware" in place. Now we need to add IP addresses.
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//
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Ipv4AddressHelper ipv4;
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NS_LOG_INFO ("Assign IP Addresses.");
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ipv4.SetBase ("10.1.1.0", "255.255.255.0");
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Ipv4InterfaceContainer i = ipv4.Assign (d);
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//
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// Create a UdpEchoServer application on node one.
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//
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NS_LOG_INFO ("Create Applications.");
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UdpEchoServerHelper server (9);
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ApplicationContainer apps = server.Install (n.Get(1));
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apps.Start (Seconds (1.0));
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apps.Stop (Seconds (10.0));
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//
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// Create a UdpEchoClient application to send UDP datagrams from node zero to node one.
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//
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uint32_t packetSize = 1024;
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uint32_t maxPacketCount = 1;
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Time interPacketInterval = Seconds (1.);
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UdpEchoClientHelper client (i.GetAddress (1), 9);
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client.SetAttribute ("MaxPackets", UintegerValue (maxPacketCount));
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client.SetAttribute ("Interval", TimeValue (interPacketInterval));
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client.SetAttribute ("PacketSize", UintegerValue (packetSize));
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apps = client.Install (n.Get (0));
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apps.Start (Seconds (2.0));
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apps.Stop (Seconds (10.0));
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std::ofstream ascii;
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ascii.open ("emu-udp-echo.tr");
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EmuHelper::EnablePcapAll ("emu-udp-echo");
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//
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// Now, do the actual simulation.
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//
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NS_LOG_INFO ("Run Simulation.");
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Simulator::Run ();
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Simulator::Destroy ();
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NS_LOG_INFO ("Done.");
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}
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