A Discrete-Event Network Simulator
API
sixth.cc
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1 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
2 /*
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4  * it under the terms of the GNU General Public License version 2 as
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10  * GNU General Public License for more details.
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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/point-to-point-module.h"
22 #include "ns3/applications-module.h"
23 
24 using namespace ns3;
25 
26 NS_LOG_COMPONENT_DEFINE ("SixthScriptExample");
27 
28 // ===========================================================================
29 //
30 // node 0 node 1
31 // +----------------+ +----------------+
32 // | ns-3 TCP | | ns-3 TCP |
33 // +----------------+ +----------------+
34 // | 10.1.1.1 | | 10.1.1.2 |
35 // +----------------+ +----------------+
36 // | point-to-point | | point-to-point |
37 // +----------------+ +----------------+
38 // | |
39 // +---------------------+
40 // 5 Mbps, 2 ms
41 //
42 //
43 // We want to look at changes in the ns-3 TCP congestion window. We need
44 // to crank up a flow and hook the CongestionWindow attribute on the socket
45 // of the sender. Normally one would use an on-off application to generate a
46 // flow, but this has a couple of problems. First, the socket of the on-off
47 // application is not created until Application Start time, so we wouldn't be
48 // able to hook the socket (now) at configuration time. Second, even if we
49 // could arrange a call after start time, the socket is not public so we
50 // couldn't get at it.
51 //
52 // So, we can cook up a simple version of the on-off application that does what
53 // we want. On the plus side we don't need all of the complexity of the on-off
54 // application. On the minus side, we don't have a helper, so we have to get
55 // a little more involved in the details, but this is trivial.
56 //
57 // So first, we create a socket and do the trace connect on it; then we pass
58 // this socket into the constructor of our simple application which we then
59 // install in the source node.
60 // ===========================================================================
61 //
62 class MyApp : public Application
63 {
64 public:
65  MyApp ();
66  virtual ~MyApp ();
67 
72  static TypeId GetTypeId (void);
73  void Setup (Ptr<Socket> socket, Address address, uint32_t packetSize, uint32_t nPackets, DataRate dataRate);
74 
75 private:
76  virtual void StartApplication (void);
77  virtual void StopApplication (void);
78 
79  void ScheduleTx (void);
80  void SendPacket (void);
81 
82  Ptr<Socket> m_socket;
83  Address m_peer;
84  uint32_t m_packetSize;
85  uint32_t m_nPackets;
86  DataRate m_dataRate;
87  EventId m_sendEvent;
88  bool m_running;
89  uint32_t m_packetsSent;
90 };
91 
92 MyApp::MyApp ()
93  : m_socket (0),
94  m_peer (),
95  m_packetSize (0),
96  m_nPackets (0),
97  m_dataRate (0),
98  m_sendEvent (),
99  m_running (false),
100  m_packetsSent (0)
101 {
102 }
103 
104 MyApp::~MyApp ()
105 {
106  m_socket = 0;
107 }
108 
109 /* static */
111 {
112  static TypeId tid = TypeId ("MyApp")
114  .SetGroupName ("Tutorial")
115  .AddConstructor<MyApp> ()
116  ;
117  return tid;
118 }
119 
120 void
121 MyApp::Setup (Ptr<Socket> socket, Address address, uint32_t packetSize, uint32_t nPackets, DataRate dataRate)
122 {
123  m_socket = socket;
124  m_peer = address;
126  m_nPackets = nPackets;
127  m_dataRate = dataRate;
128 }
129 
130 void
132 {
133  m_running = true;
134  m_packetsSent = 0;
135  m_socket->Bind ();
137  SendPacket ();
138 }
139 
140 void
142 {
143  m_running = false;
144 
145  if (m_sendEvent.IsRunning ())
146  {
147  Simulator::Cancel (m_sendEvent);
148  }
149 
150  if (m_socket)
151  {
152  m_socket->Close ();
153  }
154 }
155 
156 void
157 MyApp::SendPacket (void)
158 {
159  Ptr<Packet> packet = Create<Packet> (m_packetSize);
160  m_socket->Send (packet);
161 
162  if (++m_packetsSent < m_nPackets)
163  {
164  ScheduleTx ();
165  }
166 }
167 
168 void
169 MyApp::ScheduleTx (void)
170 {
171  if (m_running)
172  {
173  Time tNext (Seconds (m_packetSize * 8 / static_cast<double> (m_dataRate.GetBitRate ())));
174  m_sendEvent = Simulator::Schedule (tNext, &MyApp::SendPacket, this);
175  }
176 }
177 
178 static void
179 CwndChange (Ptr<OutputStreamWrapper> stream, uint32_t oldCwnd, uint32_t newCwnd)
180 {
181  NS_LOG_UNCOND (Simulator::Now ().GetSeconds () << "\t" << newCwnd);
182  *stream->GetStream () << Simulator::Now ().GetSeconds () << "\t" << oldCwnd << "\t" << newCwnd << std::endl;
183 }
184 
185 static void
187 {
188  NS_LOG_UNCOND ("RxDrop at " << Simulator::Now ().GetSeconds ());
189  file->Write (Simulator::Now (), p);
190 }
191 
192 int
193 main (int argc, char *argv[])
194 {
195  CommandLine cmd (__FILE__);
196  cmd.Parse (argc, argv);
197 
199  nodes.Create (2);
200 
202  pointToPoint.SetDeviceAttribute ("DataRate", StringValue ("5Mbps"));
203  pointToPoint.SetChannelAttribute ("Delay", StringValue ("2ms"));
204 
206  devices = pointToPoint.Install (nodes);
207 
208  Ptr<RateErrorModel> em = CreateObject<RateErrorModel> ();
209  em->SetAttribute ("ErrorRate", DoubleValue (0.00001));
210  devices.Get (1)->SetAttribute ("ReceiveErrorModel", PointerValue (em));
211 
213  stack.Install (nodes);
214 
216  address.SetBase ("10.1.1.0", "255.255.255.252");
218 
219  uint16_t sinkPort = 8080;
220  Address sinkAddress (InetSocketAddress (interfaces.GetAddress (1), sinkPort));
221  PacketSinkHelper packetSinkHelper ("ns3::TcpSocketFactory", InetSocketAddress (Ipv4Address::GetAny (), sinkPort));
222  ApplicationContainer sinkApps = packetSinkHelper.Install (nodes.Get (1));
223  sinkApps.Start (Seconds (0.));
224  sinkApps.Stop (Seconds (20.));
225 
226  Ptr<Socket> ns3TcpSocket = Socket::CreateSocket (nodes.Get (0), TcpSocketFactory::GetTypeId ());
227 
228  Ptr<MyApp> app = CreateObject<MyApp> ();
229  app->Setup (ns3TcpSocket, sinkAddress, 1040, 1000, DataRate ("1Mbps"));
230  nodes.Get (0)->AddApplication (app);
231  app->SetStartTime (Seconds (1.));
232  app->SetStopTime (Seconds (20.));
233 
234  AsciiTraceHelper asciiTraceHelper;
235  Ptr<OutputStreamWrapper> stream = asciiTraceHelper.CreateFileStream ("sixth.cwnd");
236  ns3TcpSocket->TraceConnectWithoutContext ("CongestionWindow", MakeBoundCallback (&CwndChange, stream));
237 
238  PcapHelper pcapHelper;
239  Ptr<PcapFileWrapper> file = pcapHelper.CreateFile ("sixth.pcap", std::ios::out, PcapHelper::DLT_PPP);
240  devices.Get (1)->TraceConnectWithoutContext ("PhyRxDrop", MakeBoundCallback (&RxDrop, file));
241 
242  Simulator::Stop (Seconds (20));
243  Simulator::Run ();
244  Simulator::Destroy ();
245 
246  return 0;
247 }
248 
Definition: fifth.cc:63
EventId m_sendEvent
Definition: fifth.cc:83
DataRate m_dataRate
Definition: fifth.cc:82
Address m_peer
Definition: fifth.cc:79
void Setup(Ptr< Socket > socket, Address address, uint32_t packetSize, uint32_t nPackets, DataRate dataRate)
static TypeId GetTypeId(void)
Register this type.
Definition: seventh.cc:114
bool m_running
Definition: fifth.cc:84
void ScheduleTx(void)
virtual void StopApplication(void)
Application specific shutdown code.
Ptr< Socket > m_socket
Definition: fifth.cc:78
virtual void StopApplication(void)
Application specific shutdown code.
Definition: fifth.cc:126
uint32_t m_packetSize
Definition: fifth.cc:80
virtual void StartApplication(void)
Application specific startup code.
Definition: fifth.cc:116
virtual ~MyApp()
static TypeId GetTypeId(void)
Register this type.
uint32_t m_nPackets
Definition: fifth.cc:81
virtual ~MyApp()
Definition: fifth.cc:100
virtual void StartApplication(void)
Application specific startup code.
uint32_t m_packetsSent
Definition: fifth.cc:85
void SendPacket(void)
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.
The base class for all ns3 applications.
Definition: application.h:61
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
uint64_t GetBitRate() const
Get the underlying bitrate.
Definition: data-rate.cc:287
This class can be used to hold variables of floating point type such as 'double' or 'float'.
Definition: double.h:41
An identifier for simulation events.
Definition: event-id.h:54
bool IsRunning(void) const
This method is syntactic sugar for !IsExpired().
Definition: event-id.cc:71
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
virtual int Send(Ptr< Packet > p, uint32_t flags)=0
Send data (or dummy data) to the remote host.
virtual int Connect(const Address &address)=0
Initiate a connection to a remote host.
virtual int Close(void)=0
Close a socket.
virtual int Bind(const Address &address)=0
Allocate a local endpoint for this socket.
Hold variables of type string.
Definition: string.h:41
Simulation virtual time values and global simulation resolution.
Definition: nstime.h:103
double GetSeconds(void) const
Get an approximation of the time stored in this instance in the indicated unit.
Definition: nstime.h:379
a unique identifier for an interface.
Definition: type-id.h:59
TypeId SetParent(TypeId tid)
Set the parent TypeId.
Definition: type-id.cc:922
#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:1244
address
Definition: first.py:44
pointToPoint
Definition: first.py:35
devices
Definition: first.py:39
stack
Definition: first.py:41
nodes
Definition: first.py:32
interfaces
Definition: first.py:48
Every class exported by the ns3 library is enclosed in the ns3 namespace.
cmd
Definition: second.py:35
static void CwndChange(Ptr< OutputStreamWrapper > stream, uint32_t oldCwnd, uint32_t newCwnd)
Definition: sixth.cc:179
static void RxDrop(Ptr< PcapFileWrapper > file, Ptr< const Packet > p)
Definition: sixth.cc:186
static const uint32_t packetSize