Network sockets (ITI8510)

The goal is to try sending and receiving data over the socket interface

You will use socket(), connect(), bind(), listen(), accept() and socket addresses for the task.

Task

There are two separate tasks.

Connection

Write a program which tries connecting to a specified machine on specified port so the following command:

connect www.lambda.ee 80

would connect to www.lambda.ee on port 80. Write "Hello, Networld!\n\n" to the socket and display any resulting data on screen. Terminate when connection is closed.

Listening

Write a server program which shows on screen whatever data is received from the network. The command line:

listen 3333

would listen on port 3333 and display any received connections.

When connection is made, display the address of the other connection, then display the data until connection is closed.

Tips

Use netcat for connecting and listening to your program:

nc www.lambda.ee 80
nc -l 8080

Note that you can only listen to ports starting from 1024.