PyBitmessage/src/upnp.py

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# A simple upnp module to forward port for BitMessage
# Reference: http://mattscodecave.com/posts/using-python-and-upnp-to-forward-a-port
import httplib
from random import randint
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import socket
from struct import unpack, pack
import threading
import time
from helper_threading import *
import shared
import tr
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def createRequestXML(service, action, arguments=[]):
from xml.dom.minidom import Document
doc = Document()
# create the envelope element and set its attributes
envelope = doc.createElementNS('', 's:Envelope')
envelope.setAttribute('xmlns:s', 'http://schemas.xmlsoap.org/soap/envelope/')
envelope.setAttribute('s:encodingStyle', 'http://schemas.xmlsoap.org/soap/encoding/')
# create the body element
body = doc.createElementNS('', 's:Body')
# create the function element and set its attribute
fn = doc.createElementNS('', 'u:%s' % action)
fn.setAttribute('xmlns:u', 'urn:schemas-upnp-org:service:%s' % service)
# setup the argument element names and values
# using a list of tuples to preserve order
# container for created nodes
argument_list = []
# iterate over arguments, create nodes, create text nodes,
# append text nodes to nodes, and finally add the ready product
# to argument_list
for k, v in arguments:
tmp_node = doc.createElement(k)
tmp_text_node = doc.createTextNode(v)
tmp_node.appendChild(tmp_text_node)
argument_list.append(tmp_node)
# append the prepared argument nodes to the function element
for arg in argument_list:
fn.appendChild(arg)
# append function element to the body element
body.appendChild(fn)
# append body element to envelope element
envelope.appendChild(body)
# append envelope element to document, making it the root element
doc.appendChild(envelope)
# our tree is ready, conver it to a string
return doc.toxml()
class UPnPError(Exception):
def __init__(self, message):
self.message
class Router:
name = ""
path = ""
address = None
routerPath = None
extPort = None
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def __init__(self, ssdpResponse, address):
import urllib2
from xml.dom.minidom import parseString
from urlparse import urlparse
from debug import logger
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self.address = address
row = ssdpResponse.split('\r\n')
header = {}
for i in range(1, len(row)):
part = row[i].split(': ')
if len(part) == 2:
header[part[0].lower()] = part[1]
try:
self.routerPath = urlparse(header['location'])
if not self.routerPath or not hasattr(self.routerPath, "hostname"):
logger.error ("UPnP: no hostname: %s", header['location'])
except KeyError:
logger.error ("UPnP: missing location header")
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# get the profile xml file and read it into a variable
directory = urllib2.urlopen(header['location']).read()
# create a DOM object that represents the `directory` document
dom = parseString(directory)
self.name = dom.getElementsByTagName('friendlyName')[0].childNodes[0].data
# find all 'serviceType' elements
service_types = dom.getElementsByTagName('serviceType')
for service in service_types:
if service.childNodes[0].data.find('WANIPConnection') > 0 or \
service.childNodes[0].data.find('WANPPPConnection') > 0:
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self.path = service.parentNode.getElementsByTagName('controlURL')[0].childNodes[0].data
self.upnp_schema = service.childNodes[0].data.split(':')[-2]
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def AddPortMapping(self, externalPort, internalPort, internalClient, protocol, description, leaseDuration = 0, enabled = 1):
from debug import logger
resp = self.soapRequest(self.upnp_schema + ':1', 'AddPortMapping', [
('NewRemoteHost', ''),
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('NewExternalPort', str(externalPort)),
('NewProtocol', protocol),
('NewInternalPort', str(internalPort)),
('NewInternalClient', internalClient),
('NewEnabled', str(enabled)),
('NewPortMappingDescription', str(description)),
('NewLeaseDuration', str(leaseDuration))
])
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self.extPort = externalPort
logger.info("Successfully established UPnP mapping for %s:%i on external port %i", internalClient, internalPort, externalPort)
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return resp
def DeletePortMapping(self, externalPort, protocol):
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from debug import logger
resp = self.soapRequest(self.upnp_schema + ':1', 'DeletePortMapping', [
('NewRemoteHost', ''),
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('NewExternalPort', str(externalPort)),
('NewProtocol', protocol),
])
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logger.info("Removed UPnP mapping on external port %i", externalPort)
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return resp
def GetExternalIPAddress(self):
from xml.dom.minidom import parseString
resp = self.soapRequest(self.upnp_schema + ':1', 'GetExternalIPAddress')
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dom = parseString(resp)
return dom.getElementsByTagName('NewExternalIPAddress')[0].childNodes[0].data
def soapRequest(self, service, action, arguments=[]):
from xml.dom.minidom import parseString
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from debug import logger
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conn = httplib.HTTPConnection(self.routerPath.hostname, self.routerPath.port)
conn.request(
'POST',
self.path,
createRequestXML(service, action, arguments),
{
'SOAPAction': '"urn:schemas-upnp-org:service:%s#%s"' % (service, action),
'Content-Type': 'text/xml'
}
)
resp = conn.getresponse()
conn.close()
if resp.status == 500:
respData = resp.read()
try:
dom = parseString(respData)
errinfo = dom.getElementsByTagName('errorDescription')
if len(errinfo) > 0:
logger.error("UPnP error: %s", respData)
raise UPnPError(errinfo[0].childNodes[0].data)
except:
raise UPnPError("Unable to parse SOAP error: %s" %(respData))
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return resp
class uPnPThread(threading.Thread, StoppableThread):
SSDP_ADDR = "239.255.255.250"
GOOGLE_DNS = "8.8.8.8"
SSDP_PORT = 1900
SSDP_MX = 2
SSDP_ST = "urn:schemas-upnp-org:device:InternetGatewayDevice:1"
def __init__ (self):
threading.Thread.__init__(self, name="uPnPThread")
self.localPort = shared.config.getint('bitmessagesettings', 'port')
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try:
self.extPort = shared.config.getint('bitmessagesettings', 'extport')
except:
self.extPort = None
self.localIP = self.getLocalIP()
self.routers = []
self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
self.sock.bind((self.localIP, 10000))
self.sock.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, 2)
self.sock.settimeout(5)
self.sendSleep = 60
self.initStop()
def run(self):
from debug import logger
logger.debug("Starting UPnP thread")
logger.debug("Local IP: %s", self.localIP)
lastSent = 0
while shared.shutdown == 0 and shared.safeConfigGetBoolean('bitmessagesettings', 'upnp'):
if time.time() - lastSent > self.sendSleep and len(self.routers) == 0:
try:
self.sendSearchRouter()
except:
pass
lastSent = time.time()
try:
while shared.shutdown == 0 and shared.safeConfigGetBoolean('bitmessagesettings', 'upnp'):
resp,(ip,port) = self.sock.recvfrom(1000)
if resp is None:
continue
newRouter = Router(resp, ip)
for router in self.routers:
if router.location == newRouter.location:
break
else:
logger.debug("Found UPnP router at %s", ip)
self.routers.append(newRouter)
self.createPortMapping(newRouter)
shared.UISignalQueue.put(('updateStatusBar', tr._translate("MainWindow",'UPnP port mapping established on port %1').arg(str(self.extPort))))
break
except socket.timeout as e:
pass
except:
logger.error("Failure running UPnP router search.", exc_info=True)
for router in self.routers:
if router.extPort is None:
self.createPortMapping(router)
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try:
self.sock.shutdown(socket.SHUT_RDWR)
except:
pass
try:
self.sock.close()
except:
pass
deleted = False
for router in self.routers:
if router.extPort is not None:
deleted = True
self.deletePortMapping(router)
shared.extPort = None
if deleted:
shared.UISignalQueue.put(('updateStatusBar', tr._translate("MainWindow",'UPnP port mapping removed')))
logger.debug("UPnP thread done")
def getLocalIP(self):
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
s.connect((uPnPThread.GOOGLE_DNS, 1))
return s.getsockname()[0]
def sendSearchRouter(self):
from debug import logger
ssdpRequest = "M-SEARCH * HTTP/1.1\r\n" + \
"HOST: %s:%d\r\n" % (uPnPThread.SSDP_ADDR, uPnPThread.SSDP_PORT) + \
"MAN: \"ssdp:discover\"\r\n" + \
"MX: %d\r\n" % (uPnPThread.SSDP_MX, ) + \
"ST: %s\r\n" % (uPnPThread.SSDP_ST, ) + "\r\n"
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try:
logger.debug("Sending UPnP query")
self.sock.sendto(ssdpRequest, (uPnPThread.SSDP_ADDR, uPnPThread.SSDP_PORT))
except:
logger.exception("UPnP send query failed")
def createPortMapping(self, router):
from debug import logger
for i in range(50):
try:
routerIP, = unpack('>I', socket.inet_aton(router.address))
localIP = self.localIP
if i == 0:
extPort = self.localPort # try same port first
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elif i == 1 and self.extPort:
extPort = self.extPort # try external port from last time next
else:
extPort = randint(32767, 65535)
logger.debug("Attempt %i, requesting UPnP mapping for %s:%i on external port %i", i, localIP, self.localPort, extPort)
router.AddPortMapping(extPort, self.localPort, localIP, 'TCP', 'BitMessage')
shared.extPort = extPort
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self.extPort = extPort
shared.config.set('bitmessagesettings', 'extport', str(extPort))
break
except UPnPError:
logger.debug("UPnP error: ", exc_info=True)
def deletePortMapping(self, router):
router.DeletePortMapping(router.extPort, 'TCP')