Python: Open a Listening Port Behind a Router (upnp?)

Question

I\'ve developed an application that is essentially just a little ftp server with the ability to specify which directory you wish to share on startup. I\'m using ftplib for t

Answer 1

Simple example for miniupnp. It creates a mapping on the discovered gateway from external port 43210 to the interface connected to port 43210 on the interface connected to the discovered gateway.

import miniupnpc

upnp = miniupnpc.UPnP()

upnp.discoverdelay = 10
upnp.discover()

upnp.selectigd()

port = 43210

# addportmapping(external-port, protocol, internal-host, internal-port, description, remote-host)
upnp.addportmapping(port, 'TCP', upnp.lanaddr, port, 'testing', '')

Answer 2

Looks like there are a few options, one being miniupnp. There are also python bindings for GNUPnP here. For windows minupnp will work, or you could go pure python with miranda-upnp.

There is a nice example of the python GNUPnP bindings being used to open ports on a router here. In that example the lease time is set to 0, which is unlimited. See here for the definition of add_port.

A simple example might be:

#! /usr/bin/python
import gupnp.igd
import glib
from sys import stderr

my_ip = YOUR_IP

igd = gupnp.igd.Simple()
igd.external_ip = None

main = glib.MainLoop()

def mep(igd, proto, eip, erip, port, localip, lport, msg):
    if port == 80:
        igd.external_ip = eip
        main.quit()

def emp(igd, err, proto, ep, lip, lp, msg):
    print >> stderr, "ERR"
    print >> stderr, err, proto, ep, lip, lp, msg
    main.quit()

igd.connect("mapped-external-port", mep)
igd.connect("error-mapping-port", emp)

#igd.add_port("PROTO", EXTERNAL_PORT, INTERNAL_IP, INTERNAL_PORT, LEASE_DURATION_IN_SECONDS, "NAME")
igd.add_port("TCP", 80, my_ip, 8080, 86400, "web")

main.run()

Answer 3

There is an article explaining how to use the Windows IGD COM object with win32com.

Answer 4

I looked for this for many days. I was unable to install miniupnpc using pip for python 3.

I solved this isue with an implementation found here which will work for python 2.

I forked it and make the changes to be used on python 3, you can find it Here

This implementation is by far the simplest I have seen and works well.

Answer 5

The protocol you want is called IGD (for Internet Gateway Device) and is based on UPNP. It allows a client program (yours) to discover the router on the network (using UPNP) and then ask it to forward a specific port.

This is supported by most home routers, and the technique is used by a lot of services like BitTorrent or multiPlayer games, bit it's a bit complicated to use or implement. There are several open source libraries that support IGD and one of the simplest one (which is also cross-platform) is "miniupnp": see http://miniupnp.free.fr/