Spying Socks Proxy

The application starts a SOCKS v4 Proxy, listening on port 8080 and supporting (exactly) 20 concurrent connections.
The program will start the proxy server, which will continue running until it is interrupted by SIGINT signal.
The program will look for passwords passed using HTTP Basic Authentication, only in connections where the destination is with port 80, and the HTTP method is GET.
(The CONNECT command of the SOCKS protocol is only implemented)