mitm.py

import socket
import select

LOCAL_IP = '127.0.0.1'
LOCAL_PORT = 80

SERVER_IP = '192.168.0.30'
SERVER_PORT = 80

# Make a listener
listener = socket.socket()
listener.bind((LOCAL_IP, LOCAL_PORT))
listener.listen(5)
con, addr = listener.accept()
listener.close()

# Make a sender
server = socket.socket()
server.connect((SERVER_IP, SERVER_PORT))

while True:
    rlist = select.select([con, server], [], [])[0]
    if con in rlist:
        buf = con.recv(4096).decode('utf-8')
        buf = buf.replace(LOCAL_IP, SERVER_IP)
        print(buf)
        server.send(buf.encode('utf-8'))
    if server in rlist:
        buf = server.recv(4096).decode('utf-8')
        print(buf)
        con.send(buf.encode('utf-8'))