# 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 import socket from struct import unpack, pack import threading import time from bmconfigparser import BMConfigParser from helper_threading import * import queues import shared import state import tr def createRequestXML(service, action, arguments=None): 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 if arguments is not None: 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 def __init__(self, ssdpResponse, address): import urllib2 from xml.dom.minidom import parseString from urlparse import urlparse from debug import logger 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") # 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: self.path = service.parentNode.getElementsByTagName('controlURL')[0].childNodes[0].data self.upnp_schema = service.childNodes[0].data.split(':')[-2] 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', ''), ('NewExternalPort', str(externalPort)), ('NewProtocol', protocol), ('NewInternalPort', str(internalPort)), ('NewInternalClient', internalClient), ('NewEnabled', str(enabled)), ('NewPortMappingDescription', str(description)), ('NewLeaseDuration', str(leaseDuration)) ]) self.extPort = externalPort logger.info("Successfully established UPnP mapping for %s:%i on external port %i", internalClient, internalPort, externalPort) return resp def DeletePortMapping(self, externalPort, protocol): from debug import logger resp = self.soapRequest(self.upnp_schema + ':1', 'DeletePortMapping', [ ('NewRemoteHost', ''), ('NewExternalPort', str(externalPort)), ('NewProtocol', protocol), ]) logger.info("Removed UPnP mapping on external port %i", externalPort) return resp def GetExternalIPAddress(self): from xml.dom.minidom import parseString resp = self.soapRequest(self.upnp_schema + ':1', 'GetExternalIPAddress') dom = parseString(resp) return dom.getElementsByTagName('NewExternalIPAddress')[0].childNodes[0].data def soapRequest(self, service, action, arguments=None): from xml.dom.minidom import parseString from debug import logger 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)) 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 = BMConfigParser().getint('bitmessagesettings', 'port') try: self.extPort = BMConfigParser().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 state.shutdown == 0 and BMConfigParser().safeGetBoolean('bitmessagesettings', 'upnp'): if time.time() - lastSent > self.sendSleep and len(self.routers) == 0: try: self.sendSearchRouter() except: pass lastSent = time.time() try: while state.shutdown == 0 and BMConfigParser().safeGetBoolean('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) queues.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) 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: queues.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" 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 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 self.extPort = extPort BMConfigParser().set('bitmessagesettings', 'extport', str(extPort)) break except UPnPError: logger.debug("UPnP error: ", exc_info=True) def deletePortMapping(self, router): router.DeletePortMapping(router.extPort, 'TCP')