tcpforwardpy2.py

#!/usr/bin/python
from socket import *
import sys
bufsize = 1024 # Modify to suit your needs

try:
    listenHost = sys.argv[1].split(":")[0]
    listenPort = int(sys.argv[1].split(":")[1])

    connectHost = sys.argv[2].split(":")[0]
    connectPort = int(sys.argv[2].split(":")[1])

except:
    print "USAGE: %s [listenHost]:[listenPort] [connectHost]:[connectPort]" % sys.argv[0]
    sys.exit()

def forward(data, port):
    print "Forwarding: '%s' from port %s" % (data, port)
    sock = socket(AF_INET, SOCK_DGRAM)
    sock.bind(("localhost", port)) # Bind to the port data came in on
    sock.sendto(data, (connectHost, connectPort))

def listen(host, port):
    listenSocket = socket(AF_INET, SOCK_DGRAM)
    listenSocket.bind((host, port))
    while True:
        data, addr = listenSocket.recvfrom(bufsize)
        forward(data, addr[1]) # data and port

listen(listenHost, listenPort)