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Java Programming

In this assignment, you will implement a peer-to-peer chat program and see the program in action using Wireshark

INSTRUCTIONS TO CANDIDATES
ANSWER ALL QUESTIONS

 Lab Assignment 3 Peer-to-Peer Chat and Wireshark

  Points possible: 150.

In this assignment, you will implement a peer-to-peer chat program and see the program in action using Wireshark. The chat client should be able to enter a chat server and “connect” to an available client. Once connected, the chat server will only receive a message from one client and forward the message to another client to give them a “feel” of peer-to-peer connection.

Chat Server

The chat server should act as a message forwarder, and it should only forward messages from one client to another. The jobs of the chat server are as follows: accept a socket connection from a new client; maintain a list of existing clients’ name, their state (busy or available), and their socket; show the existing clients’ name and their state to the new client; maintain a connection table with the list of peer connections; and forward message from one client to another as per the connection table.

Note that the server should be able to accept new connection at any state, without waiting for input from the existing clients. So, the server should be able to maintain the connection to all existing sockets, receive packets from and send packets to the sockets, and poll for a new socket connection from a new client. You can assume the server can support a maximum of 100 clients. You should implement the main class for the chat server in a file called chat server.java.

Chat Client

When a new client enters the chat program, it should choose an available client from a list of clients to get connected to and start the chat. A client can get out of the program at any time they want. This should   not affect the existing clients; but the server needs to remove the client’s name, state and update the peer connection table. You should implement the main class for the chat client in a file called chat client.java.

 

See below for a sample output of the chat program. The clients are connected to the chat server sequentially

— Client 1; then, Client 2; and then, Client 3. The outputs are color-coded to distinguish the relationship between peer connections (via server). Of course, you do not have to color-code your program output.

Wireshark

We will now use the Wireshark tool to debug the chat server and client. First, open Wireshark GUI in a VM where you will run the chat server; set the Wireshark to capture packets from enp0s8. (Recall from the lab assignment 2, the VM uses enp0s3 to talk to the Internet and enp0s8 to talk to the host machine and other VMs; thus, we will only capture packets from enp0s8.) Second, set the Wireshark filter to tcp to only show the TCP packets. Finally, run the chat server and connect your clients one after another.

 

Now, looking at your Wireshark output, answer the following questions. You should write your answers in a file called chat wireshark ans.txt.

 

Your server should run as:

$ java chat server #port Waiting for a client ... Client accepted

List of clients and states

Client 1:

$ java chat client #IP #port Enter client name:

albert

Welcome to the 416 chat server

Client 2:

$ java chat client #IP #port Enter client name:

alan

Welcome to the 416 chat server

Client 3:

$ java chat client #IP #port Enter client name:

claude

Welcome to the 416 chat server

albert

free

List of clients & states

 

List of clients & states

 

List of clients & states

 

Waiting for a client ...

 

albert

free

albert

free

albert

busy

Client accepted

 

List of clients & states

 

alan

free

alan

busy

List of clients and states

albert                     free

alan                       free

Waiting for a client ... Client accepted

List of clients and states albert          busy

alan                      busy

claude                    free

.

albert                            free

alan                              free

Connect to which client? Received request from alan Connect? y

You are connected to alan albert: hi, alan!

alan: yo albert. hru? albert: gd. wbu?

alan disconnected

List of clients and states

albert                            free

claude                           free

Connect to which client? claude

.

Connect to which client? albert

You are connected to albert alan:

albert: hi, alan! alan: yo albert. hru? albert: gd. wbu?

// alan disconnects

claude                           free

List of clients and states

albert                            free

claude                           free

Connect to which client? Received request from albert Connect? y

You are connected to albert claude: heyyy ...

albert: hi

.

Questions:

  • How many TCP control packets are exchanged over the network when a new client connects to the chat server? Briefly explain the packet

  • When a client connects to server, what is RTT for SYN-ACK packet? How did you find it in the Wireshark?

  • How many TCP packets are exchanged when one client sends a chat message to the other client? How many TCP control packets are exchanged when a client leaves the chat program?

  • How many TCP control packets are exchanged when a client wants to join the chat server, but no server is running? Briefly explain the packet

Now, connect 4 clients to the chat server sequentially. You should take a .jpg snapshot of your Wireshark output when all the 4 clients are connected, and name the snapshot as chat wireshark.jpg. Note that your Wireshark output should show all TCP control packets for all 4 clients.

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