dos.py

import socket
import threading

#this program sits in the middle between a client and a server
# it should listen to data from the client
#detect dos
#and send it to server


#               todo!
#TODO: prevent from server to crash
#TODO: let server detect diffrent clients


host="localhost"
out_port = 35000 #port of server
in_port = 33440 #port of client
size = 1024

def listen():
    in_socket.listen(5)


in_socket= socket.socket(socket.AF_INET, socket.SOCK_STREAM) #this socket only recive data from client
out_socket=socket.socket(socket.AF_INET, socket.SOCK_STREAM) #this socket only send data to server
in_socket.bind((host,in_port))#wait for client
threading.Thread(target=listen()).start()# don't worry, it just let the in_socket to listen the client and don't disturb the sending to the server
out_socket.connect((host,out_port))
while 1:
    client, address = in_socket.accept()
    data = client.recv(size)
    if data:
        print 'Got connection from', address
        #here our super_duper_double_cool function will block suspicious clients
        out_socket.send(data)
        print("sent")