make

For server, please run ./server. By default, server listens at port 10260.

For client, please run ./client. You will see a help message:

$ ./client
Usage:
        ./client <ip> <port> <filename>

Please run command ./client 127.0.0.1 10260 file-to-send.

• ✔ Socket connection (i.e., connect and bye commands)
• ✔ File correctness
• ✔ Help message
• ✔ Code comments & README file
• ✔ Bonus: Out‐of‐sequence scenario (both server and client drops packet)

For every packet, a TCP-like packet structure is constructed to provide 3-way handshaking, sequence/acknowledge number, flow control, congestion control.

The server starts listening at UDP port 10260 and waits for only 1 client at a time to complete the 3-way handshake, then starts to receive file.

After the file transmission is done, client sends FIN packet to inform server to shutdown the connection.

Once server received the file and shut down the connection, it starts to wait another client to send file.