Question

The instructions for my assignment are below; however I came across this code but when I try to run it, I get nothing but either bugging issues or error in the python shell.

1. Write a simple port scanner program using the built-in Socket module. Test your port scanner by targeting your own computer or you can reference https://www.hackthissite.org
2. Test your code and document testing by taking screenshots.

Answer 1

SOURCE CODE:

import socket

def port_scanner():
    # inclusive range 1 to 1024
    for port in range(1, 1024 + 1):
        socket_obj = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        result = socket_obj.connect_ex(("localhost", port))
        # checking for open port
        if result is None:
            print("Port ", port, "open")

        socket_obj.close()

port_scanner()

OUTPUT:

EXPLANATION:

The socket.connect_ex() returns None if a port is already in use, i.e., in the open state.
Hence we check whether it is None or not If None we print it.