connect-back.py

# An example of bootstrapping remote echo client via SSH connection
import socket
import subprocess
import sys

host = '192.168.1.20'

SSH_CLIENT = sys.platform=='win32' and 'plink' or 'ssh'

REMOTE_CODE = '''"import os, socket, sys
host = os.environ['SSH_CONNECTION'].split()[0]
port = int(sys.stdin.read())
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((host, port))
while 1:
  s.send(s.recv(1024))
s.close()
"'''

p = subprocess.Popen([SSH_CLIENT, host, 'python', '-c', REMOTE_CODE],
                 stdin=subprocess.PIPE, stdout=subprocess.PIPE)

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

s.bind(('', 0))
s.listen(1)

port = s.getsockname()[1]
p.stdin.write(str(port))
p.stdin.close()

conn, addr = s.accept()
print 'Connected by', addr

while 1:
  conn.send(raw_input('local: '))
  data = conn.recv(1024)
  if not data: break
  print 'remote:', data
conn.close()