Public
Snippet $182 authored by Jérome Perrin

Script to proxy TCP connection from public IPv6:port to -> localhost:same port

python
#!/usr/bin/python
# This is a simple port-forward / proxy, written using only the default python
# library. If you want to make a suggestion or fix something you can contact-me
# at voorloop_at_gmail.com
# Distributed over IDC(I Don't Care) license
import socket
import select
import time
import sys

# Changing the buffer_size and delay, you can improve the speed and bandwidth.
# But when buffer get to high or delay go too down, you can broke things
buffer_size = 4096
delay = 0.0001

target_host = 'localhost'
try:
  port = int(sys.argv[1])
except:
  target_host, port = sys.argv[1].split(':')
  port = int(port)

# XXX this works when gethostbyname is not correctly set for ipv6
import subprocess
listen_host = subprocess.check_output('ip -6 addr show eth0 | grep inet | grep -v fe80 | cut -d\  -f 6 | cut -d / -f 1', shell=True).strip()

listen = (listen_host, port)
forward_to = (target_host, port)

class Forward:
    def __init__(self):
        self.forward = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

    def start(self, host, port):
        try:
            self.forward.connect((host, port))
            return self.forward
        except Exception, e:
            print "error forwarding to", (host, port), e
            return False

class TheServer:
    input_list = []
    channel = {}

    def __init__(self, port):
        self.server = socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
        self.server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        addr = (listen[0], listen[1], 0, 0)
        print "listening on http://[%s]:%s" % (addr[0], addr[1])
        self.server.bind(addr)
        self.server.listen(200)

    def main_loop(self):
        self.input_list.append(self.server)
        while 1:
            time.sleep(delay)
            ss = select.select
            inputready, outputready, exceptready = ss(self.input_list, [], [])
            for self.s in inputready:
                if self.s == self.server:
                    self.on_accept()
                    break

                self.data = self.s.recv(buffer_size)
                if len(self.data) == 0:
                    self.on_close()
                    break
                else:
                    self.on_recv()

    def on_accept(self):
        forward = Forward().start(forward_to[0], forward_to[1])
        clientsock, clientaddr = self.server.accept()
        if forward:
            print clientaddr, "has connected"
            self.input_list.append(clientsock)
            self.input_list.append(forward)
            self.channel[clientsock] = forward
            self.channel[forward] = clientsock
        else:
            print "Can't establish connection with remote server.",
            print "Closing connection with client side", clientaddr
            clientsock.close()

    def on_close(self):
        print self.s.getpeername(), "has disconnected"
        #remove objects from input_list
        self.input_list.remove(self.s)
        self.input_list.remove(self.channel[self.s])
        out = self.channel[self.s]
        # close the connection with client
        self.channel[out].close()  # equivalent to do self.s.close()
        # close the connection with remote server
        self.channel[self.s].close()
        # delete both objects from channel dict
        del self.channel[out]
        del self.channel[self.s]

    def on_recv(self):
        data = self.data
        # here we can parse and/or modify the data before send forward
        self.channel[self.s].send(data)

if __name__ == '__main__':
        server = TheServer(10000)
        try:
            server.main_loop()
        except KeyboardInterrupt:
            print "Ctrl C - Stopping server"
            sys.exit(1)