How to Implement Network Telnet in OMNeT++
To implement the Network Telnet in OMNeT++, we have to simulate the simple actions of the Telnet protocol that is used for remote command-line access through the network. While SSH Telnet does not offer encryption, we can focus on the simulation of unencrypted communication amongst a client and a server across the network.
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In this setup, we offered the implementation process of Network Telnet in OMNeT++:
Step-by-Step Implementation:
- Set Up OMNeT++ and INET Framework
- Make sure that OMNeT++ and the INET framework are installed and correctly configured.
- Generate a new project in OMNeT++ and add the INET framework, which delivers the essential network models.
- Design the Network Topology
- State the network topology using an .ned file. It should contain a client and a server node, and capably a router or switch if you want to simulate a more difficult network.
Example .ned file:
network TelnetNetwork {
submodules:
client: StandardHost {
@display(“p=100,200”);
}
server: StandardHost {
@display(“p=300,200”);
}
router: Router {
@display(“p=200,100”);
}
connections:
client.ethg++ <–> Ethernet100M <–> router.pppg++;
router.pppg++ <–> Ethernet100M <–> server.ethg++;
}
This network has a client, a server, and a router linking them.
- Implement Telnet Client and Server
- Deploy basic Telnet client and server modules that can transmit plain text commands and responses.
Example of a basic Telnet client:
class TelnetClient : public cSimpleModule
{
protected:
virtual void initialize() override;
virtual void handleMessage(cMessage *msg) override;
void initiateTelnet();
void sendCommand();
};
void TelnetClient::initialize()
{
scheduleAt(simTime() + 1, new cMessage(“startTelnet”));
}
void TelnetClient::handleMessage(cMessage *msg)
{
if (strcmp(msg->getName(), “startTelnet”) == 0) {
initiateTelnet();
} else if (strcmp(msg->getName(), “commandResponse”) == 0) {
EV << “Received Response: ” << msg->getName() << endl;
delete msg;
}
}
void TelnetClient::initiateTelnet()
{
EV << “Initiating Telnet Connection” << endl;
sendCommand();
}
void TelnetClient::sendCommand()
{
cMessage *cmd = new cMessage(“command”);
cmd->addPar(“command”) = “show version”;
EV << “Sending Command: ” << cmd->par(“command”).stringValue() << endl;
send(cmd, “out”);
}
This Telnet client sends a command to the server over the network.
Example of a basic Telnet server:
class TelnetServer : public cSimpleModule
{
protected:
virtual void handleMessage(cMessage *msg) override;
void executeCommand(cMessage *msg);
};
void TelnetServer::handleMessage(cMessage *msg)
{
if (strcmp(msg->getName(), “command”) == 0) {
executeCommand(msg);
}
}
void TelnetServer::executeCommand(cMessage *msg)
{
EV << “Executing Command: ” << msg->par(“command”).stringValue() << endl;
cMessage *response = new cMessage(“commandResponse”);
response->setName(“Response: Telnet Server v1.0”);
send(response, “out”);
delete msg;
}
This Telnet server receives the command, processes it, and sends back a reply.
- Simulate Unencrypted Communication
- Since Telnet does not encrypt data, mimic the plain text transmission of commands and replies amongst the client and server.
You can log the communication in the simulation to authenticate that data is being exchanged as plain text.
- Configure the Simulation
- Configure the simulation parameters in the .ini file to run the Telnet protocol simulation.
Example .ini file configuration:
[Config TelnetSimulation]
network = TelnetNetwork
sim-time-limit = 100s
*.client.numApps = 1
*.client.app[0].typename = “TelnetClient”
*.server.numApps = 1
*.server.app[0].typename = “TelnetServer”
*.router.pppg[*].queue.typename = “DropTailQueue” # Optional, for simulating network conditions
This set up runs the Telnet simulation with a client and server, and an optional router to imitate network conditions.
- Run the Simulation
- Implement the simulation in OMNeT++ to monitor how the Telnet protocol simulation operates. Observe the logs to validate that commands are sent from the client to the server and that the server is reacting appropriately.
- Visualize the communication amongst the client and the server by using OMNeT++’s built-in tools.
- Analyze the Results
- After running the simulation, evaluate the interaction amongst the client and server. Assess how the simulated Telnet protocol permits for remote command execution over the network.
- Check the record and output files to make certain that data is transmitted properly and that the server deploys the commands as expected.
- Optimize and Extend
- Based on the analysis, enhance the Telnet simulation. It includes refining the command execution process, mimicking different network conditions, or extending the protocol to help more difficult commands.
- Consider extending the simulation to encompass features like session management, managing many clients, or simulating network latency and packet loss to see how they impact Telnet communication.
Overall, we covered the valuable insights through the step-by-step guide to simulate the basic elements of the Telnet protocol in OMNeT++ using INET framework which provides network models for network topology. If needed, we will also offer the additional details through another manual.