A Discrete-Event Network Simulator
API
sixth.cc
Go to the documentation of this file.
1/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
2/*
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License version 2 as
5 * published by the Free Software Foundation;
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
15 */
16
17#include <fstream>
18#include "ns3/core-module.h"
19#include "ns3/network-module.h"
20#include "ns3/internet-module.h"
21#include "ns3/applications-module.h"
22#include "ns3/point-to-point-module.h"
23#include "tutorial-app.h"
24
25using namespace ns3;
26
27NS_LOG_COMPONENT_DEFINE ("SixthScriptExample");
28
29// ===========================================================================
30//
31// node 0 node 1
32// +----------------+ +----------------+
33// | ns-3 TCP | | ns-3 TCP |
34// +----------------+ +----------------+
35// | 10.1.1.1 | | 10.1.1.2 |
36// +----------------+ +----------------+
37// | point-to-point | | point-to-point |
38// +----------------+ +----------------+
39// | |
40// +---------------------+
41// 5 Mbps, 2 ms
42//
43//
44// We want to look at changes in the ns-3 TCP congestion window. We need
45// to crank up a flow and hook the CongestionWindow attribute on the socket
46// of the sender. Normally one would use an on-off application to generate a
47// flow, but this has a couple of problems. First, the socket of the on-off
48// application is not created until Application Start time, so we wouldn't be
49// able to hook the socket (now) at configuration time. Second, even if we
50// could arrange a call after start time, the socket is not public so we
51// couldn't get at it.
52//
53// So, we can cook up a simple version of the on-off application that does what
54// we want. On the plus side we don't need all of the complexity of the on-off
55// application. On the minus side, we don't have a helper, so we have to get
56// a little more involved in the details, but this is trivial.
57//
58// So first, we create a socket and do the trace connect on it; then we pass
59// this socket into the constructor of our simple application which we then
60// install in the source node.
61// ===========================================================================
62//
63
64
65static void
67{
68 NS_LOG_UNCOND (Simulator::Now ().GetSeconds () << "\t" << newCwnd);
69 *stream->GetStream () << Simulator::Now ().GetSeconds () << "\t" << oldCwnd << "\t" << newCwnd << std::endl;
70}
71
72static void
74{
75 NS_LOG_UNCOND ("RxDrop at " << Simulator::Now ().GetSeconds ());
76 file->Write (Simulator::Now (), p);
77}
78
79int
80main (int argc, char *argv[])
81{
82 CommandLine cmd (__FILE__);
83 cmd.Parse (argc, argv);
84
86 nodes.Create (2);
87
89 pointToPoint.SetDeviceAttribute ("DataRate", StringValue ("5Mbps"));
90 pointToPoint.SetChannelAttribute ("Delay", StringValue ("2ms"));
91
93 devices = pointToPoint.Install (nodes);
94
95 Ptr<RateErrorModel> em = CreateObject<RateErrorModel> ();
96 em->SetAttribute ("ErrorRate", DoubleValue (0.00001));
97 devices.Get (1)->SetAttribute ("ReceiveErrorModel", PointerValue (em));
98
100 stack.Install (nodes);
101
103 address.SetBase ("10.1.1.0", "255.255.255.252");
105
106 uint16_t sinkPort = 8080;
107 Address sinkAddress (InetSocketAddress (interfaces.GetAddress (1), sinkPort));
108 PacketSinkHelper packetSinkHelper ("ns3::TcpSocketFactory", InetSocketAddress (Ipv4Address::GetAny (), sinkPort));
109 ApplicationContainer sinkApps = packetSinkHelper.Install (nodes.Get (1));
110 sinkApps.Start (Seconds (0.));
111 sinkApps.Stop (Seconds (20.));
112
113 Ptr<Socket> ns3TcpSocket = Socket::CreateSocket (nodes.Get (0), TcpSocketFactory::GetTypeId ());
114
115 Ptr<TutorialApp> app = CreateObject<TutorialApp> ();
116 app->Setup (ns3TcpSocket, sinkAddress, 1040, 1000, DataRate ("1Mbps"));
117 nodes.Get (0)->AddApplication (app);
118 app->SetStartTime (Seconds (1.));
119 app->SetStopTime (Seconds (20.));
120
121 AsciiTraceHelper asciiTraceHelper;
122 Ptr<OutputStreamWrapper> stream = asciiTraceHelper.CreateFileStream ("sixth.cwnd");
123 ns3TcpSocket->TraceConnectWithoutContext ("CongestionWindow", MakeBoundCallback (&CwndChange, stream));
124
125 PcapHelper pcapHelper;
126 Ptr<PcapFileWrapper> file = pcapHelper.CreateFile ("sixth.pcap", std::ios::out, PcapHelper::DLT_PPP);
127 devices.Get (1)->TraceConnectWithoutContext ("PhyRxDrop", MakeBoundCallback (&RxDrop, file));
128
129 Simulator::Stop (Seconds (20));
131 Simulator::Destroy ();
132
133 return 0;
134}
135
void Run(ObjectFactory &factory, uint32_t pop, uint32_t total, uint32_t runs, Ptr< RandomVariableStream > eventStream, bool calRev)
Perform the runs for a single scheduler type.
a polymophic address class
Definition: address.h:91
holds a vector of ns3::Application pointers.
void Start(Time start)
Arrange for all of the Applications in this container to Start() at the Time given as a parameter.
void Stop(Time stop)
Arrange for all of the Applications in this container to Stop() at the Time given as a parameter.
Manage ASCII trace files for device models.
Definition: trace-helper.h:163
Ptr< OutputStreamWrapper > CreateFileStream(std::string filename, std::ios::openmode filemode=std::ios::out)
Create and initialize an output stream object we'll use to write the traced bits.
Parse command-line arguments.
Definition: command-line.h:229
Class for representing data rates.
Definition: data-rate.h:89
This class can be used to hold variables of floating point type such as 'double' or 'float'.
Definition: double.h:41
an Inet address class
aggregate IP/TCP/UDP functionality to existing Nodes.
A helper class to make life easier while doing simple IPv4 address assignment in scripts.
holds a vector of std::pair of Ptr<Ipv4> and interface index.
holds a vector of ns3::NetDevice pointers
keep track of a set of node pointers.
bool TraceConnectWithoutContext(std::string name, const CallbackBase &cb)
Connect a TraceSource to a Callback without a context.
Definition: object-base.cc:364
void SetAttribute(std::string name, const AttributeValue &value)
Set a single attribute, raising fatal errors if unsuccessful.
Definition: object-base.cc:256
std::ostream * GetStream(void)
Return a pointer to an ostream previously set in the wrapper.
A helper to make it easier to instantiate an ns3::PacketSinkApplication on a set of nodes.
Manage pcap files for device models.
Definition: trace-helper.h:39
Ptr< PcapFileWrapper > CreateFile(std::string filename, std::ios::openmode filemode, DataLinkType dataLinkType, uint32_t snapLen=std::numeric_limits< uint32_t >::max(), int32_t tzCorrection=0)
Create and initialize a pcap file.
Definition: trace-helper.cc:49
Build a set of PointToPointNetDevice objects.
Hold objects of type Ptr<T>.
Definition: pointer.h:37
Hold variables of type string.
Definition: string.h:41
double GetSeconds(void) const
Get an approximation of the time stored in this instance in the indicated unit.
Definition: nstime.h:380
#define NS_LOG_UNCOND(msg)
Output the requested message unconditionally.
#define NS_LOG_COMPONENT_DEFINE(name)
Define a Log component with a specific name.
Definition: log.h:205
Callback< R > MakeBoundCallback(R(*fnPtr)(TX), ARG a1)
Make Callbacks with one bound argument.
Definition: callback.h:1709
Time Now(void)
create an ns3::Time instance which contains the current simulation time.
Definition: simulator.cc:287
Time Seconds(double value)
Construct a Time in the indicated unit.
Definition: nstime.h:1245
address
Definition: first.py:40
pointToPoint
Definition: first.py:31
devices
Definition: first.py:35
stack
Definition: first.py:37
nodes
Definition: first.py:28
interfaces
Definition: first.py:44
Every class exported by the ns3 library is enclosed in the ns3 namespace.
cmd
Definition: second.py:43
static void CwndChange(Ptr< OutputStreamWrapper > stream, uint32_t oldCwnd, uint32_t newCwnd)
Definition: sixth.cc:66
static void RxDrop(Ptr< PcapFileWrapper > file, Ptr< const Packet > p)
Definition: sixth.cc:73