messenger.py - import import import import sys socket...

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import sys import socket import getopt import os def usage(script_name): #include the port number and server address if not localhost print('Usage: py '+ script_name +' [-l]'+ ' <port number>' + ' [<server address>]') def clientConnection(server,port): sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) #socket address families constants if server: sock.connect((server,int(port))) #connect to given server address and the port number else: #client sock.connect(('localhost',int(port))) #connect to localhost and given port number return sock def connectionListener(port): serversocket = socket.socket(socket.AF_INET,socket.SOCK_STREAM) #socket adress and type serversocket.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR,1) #socket flags serversocket.bind(('',int(port))) #bind the socket to available interface serversocket.listen(5) #listen for connection and accepts 5 backlog sock,addr = serversocket.accept() #accept a connection with a new sock and address return sock def receive(sock): msg_bytes = sock.recv(1024) #receive message w/ max amount of data of 1024
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