Socket-Programming

In this repository are developed (in Python) some simple computer networking concepts, in particular:

• a Web Server that will
  1. create a connection socket when contacted by a client (browser),
  2. reveive the HTTP request from this connection,
  3. parse the request to determine what file is requested,
  4. get the requested file from the server's file system, send the response over the TCP connection to the requesting browser
• a UDP Pinger to estimate the delay (RTT) in a network
• a Mail Client that sends e-mails to any recipient by creating a TCP connection with a mail server, dialogue with it using the SMTP protocol and send an e-mail to a recipient.
• a Web Proxy that recieves an HTTP request for an object, generates a new HTTP request for the same object and sends it back to the origin server.

What's in here?

• A folder web_server with inside 4 files: the instructions instructions.pdf, a toy website hello.html and 2 python scripts to set up a web server to handle HTTP request over a TCP connection
• A folder mail_service with inside 3 python scripts to set up a mail client that dialogues with a mail server over a TCP connection using the SMTP protocol
• A folder pinger with inside 4 python scripts to build a pinger over a UDP connection, and an instructions' file
• A folder proxy_server with an instructions' file and a python script to create a web proxy that can recieve and respond to HTTP requests.

Disclamair

These programs where inspired by the classic "Computer Networking, A Top-Down Approach" by J. F. Kurose and K. W. Ross.