Python socket listen on all ports

Question

Basically, I want to listen to all ports using the socket module. How do I make it so that port is = to all the open ports on the server? Any guides and or resources are highly appreciated Here is my current code.

import socket

def Main():
    host = '127.0.0.1'
    port = 5000

    s = socket.socket()
    s.bind((host, port))

    s.listen(1)
    c, addr = s.accept()
    print('Connection from: ' + str(addr))
    while True:
        data = c.recv(1024)
        if not data:
            break
        print('from connected user: ' + str(data))
        data = str(data).upper()
        print('sending: ' + str(data))
        c.send(data)
    c.close()


if __name__ == '__main__':
    Main()

Answer 1

You may try all possible ports and store them in a list. Remember ports below 1024 are reserved and some of the ports may be in use. So, you will get some errors and you need to handle those if you cannot bind to that port. Also, you need a socket for each port since a socket can only listen at one port. Create a function create_socket which returns socket, then store them is a list. If you get error while trying to connect, just pass those errors. This may not be a good approach but it will work for you.

def create_socket(port_number):
    server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    server_socket.bind(('127.0.0.1', port_number))
    server_socket.listen(1)

    return server_socket

socket_list = []

for port_number in range(1025,65536):
    try:
        socket_list.append(create_socket(port_number))
    except Exception: 
        pass