Python Port Listener (Like NC)

Question

So I would like to make a Python port listener that resembles Netcat (nc -l -v -p 2121). I have looked around and haven't been able to find what I am looking for. I just want to be able to give a port via a CLI argument and listen on that port (python listen.py 2121). If anyone could point me in the right direction it would be much appreciated.

Answer 1

The place to start from will be the socket module (which is a builtin).

To set up a listening socket s , you would do something like:

port = 1234

s = socket.socket()
s.bind(("", port))
s.listen(1)

Once the socket is listening, you can accept a connection on it using socket.accept() , which will return a tuple containing the connected socket and the address it connected from.

Answer 2

查看SocketServer模块，那里有很多例子。