Python script to create a Connect-Connect tunnel. For those times ncat/socat can't be put on the box and python is available..

pyforw.py

#!/usr/bin/python
"""
   Python script to create a Connect-Connect tunnel. For those times ncat/socat can't be put on the box and python is available..
   Author: Etienne Stalmans <etienne@sensepost.com>
   Version: 1.0 (22_01_2015)
   Usage: python pyforw.py <targetIP> <targetPort> <jumpbox> <jumpboxPort>
          python pyforw.py 10.1.1.1 3389 179.0.0.100 8081
"""

from socket import *
import sys
import multiprocessing as mp
import time 

bufsize = 4096 # Modify to suit your needs
targetHost = sys.argv[1]
targetPort = int(sys.argv[2])
listenHost = sys.argv[3]
listenPort = int(sys.argv[4])

def listener(lsock,rsock):
    while True:
            try:
                data = lsock.recv(bufsize)
                if data:
                     forward(rsock,data)
            except:
                   continue

def forward(sock,data):
    sock.sendall(data)

def listen(host, port):
    listenSocket = socket(AF_INET, SOCK_STREAM)
    listenSocket.connect((host, port))
    otherSocket = socket(AF_INET, SOCK_STREAM)
    otherSocket.connect((targetHost, targetPort))
    workers = []
    workers.append(mp.Process(target=listener, args=(listenSocket,otherSocket)))
    workers.append(mp.Process(target=listener, args=(otherSocket,listenSocket)))

    for p in workers:
        p.daemon = True
        p.start()
    while True:
          try:
              time.sleep(10)
          except:
              break
 
listen(listenHost,listenPort)