Manual for using the code files

Simple ARP Simulator

Features

• Language used: C++14
• Libraries used:
  • netinet/in.h - For using the IPv4 macros
  • sys/socket.h - For using socket functions
  • sys/types.h
  • unistd.h - for sleep and other functions
• The server mimics the role of a router
• Clients can dynamically register or leave the router
• The clients are monitored using the select() method
• The clients can communicate in the following ways:
  • To get the list of active clients in the network
    • LL
  • To send ARP request to the server
    • AQ { IP of destination client device }
  • To send a normal message to a client through the server
    • NN { destination client ID } { the message }
• Uses PORT 8080 for communication
• Uses pthreads for concurrent read operations by clients and server

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Prerequisites

• Linux Ubuntu Operating System
• G++ Compiler
• PORT 8080 open in the system
• pthread library for Multithreading

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File Description

• MainServer.cpp
  • This is the main file that is to be run to get the server started
• Client.cpp
  • This is the client side code to be run to connect to the server
• demo.mp4
  • This is a sample output video of the code running

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Running the code

• Run the MainServer.cpp in Terminal 1 as:

  • $ g++ MainServer.cpp -o s
  • $ ./s
  • This will start the server on PORT 7070

• Run the Client.cpp in Terminal 2 as:

  • $ g++ Client.cpp -o c -lpthread
  • $ ./c 127.0.0.1
  • This will connect the client to the server
  • Multiple Terminals can be opened and hence multiple clients can parallely communicate with each other

• Once the client is connected to the server:

  • Enter a pseudo IP address (for simultion purpose only) in client terminal
  • Parallely, a unique MAC will be generated

• The same process can be followed for other client

• Now, the clients can send messages in the above format and the server will handle the queries

• The main query, that is an ARP request is processed as

  • First, the client sends the ARP request for the desired IP address (assuming that the client had called a LL earlier)
  • Now, the server will receive this message
  • The server will then broadcast this message to all the connected clients
  • If the IP matches with any of the clients, then that client will respond back to the server with its MAC address
  • Then, the server will send this MAC address to the requested client

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Sample Output

Here is a sample video of the same