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# Copyright (c) str4d <str4d@mail.i2p>
# See COPYING for details.
from __future__ import print_function
from builtins import object
from twisted.internet.defer import Deferred
from twisted.internet.endpoints import TCP4ClientEndpoint, TCP4ServerEndpoint
from twisted.internet.protocol import ClientFactory, Factory
from txi2p.address import I2PAddress
from txi2p.bob.protocol import (I2PClientTunnelCreatorBOBClient,
I2PServerTunnelCreatorBOBClient,
I2PTunnelRemoverBOBClient,
I2PClientTunnelProtocol,
I2PServerTunnelProtocol,
I2PListeningPort)
class BOBI2PClientFactory(ClientFactory):
protocol = I2PClientTunnelCreatorBOBClient
bobProto = None
canceled = False
removeTunnelWhenFinished = True
def _cancel(self, d):
self.bobProto.sender.transport.abortConnection()
self.canceled = True
def __init__(self, reactor, clientFactory, bobEndpoint, dest,
tunnelNick=None,
inhost='localhost',
inport=None,
options={}):
self._reactor = reactor
self._clientFactory = clientFactory
self._bobEndpoint = bobEndpoint
self.dest = dest
self.tunnelNick = tunnelNick
self.inhost = inhost
self.inport = inport
self.options = options
self.deferred = Deferred(self._cancel);
def buildProtocol(self, addr):
proto = self.protocol()
proto.factory = self
self.bobProto = proto
return proto
def bobConnectionFailed(self, reason):
if not self.canceled:
self.deferred.errback(reason)
# This method is not called if an endpoint deferred errbacks
def clientConnectionFailed(self, connector, reason):
self.bobConnectionFailed(reason)
def i2pTunnelCreated(self):
# BOB is now listening for a tunnel.
# BOB only listens on TCP4 (for now).
clientEndpoint = TCP4ClientEndpoint(self._reactor, self.inhost, self.inport)
# Wrap the client Factory.
wrappedFactory = BOBClientFactoryWrapper(self._clientFactory,
self._bobEndpoint,
I2PAddress(self.localDest),
self.tunnelNick,
self.removeTunnelWhenFinished)
wrappedFactory.setDest(self.dest)
d = clientEndpoint.connect(wrappedFactory)
def checkProto(proto):
if proto is None:
self.deferred.cancel()
return proto
d.addCallback(checkProto)
# When the Deferred returns an IProtocol, pass it on.
d.chainDeferred(self.deferred)
class BOBI2PServerFactory(Factory):
protocol = I2PServerTunnelCreatorBOBClient
bobProto = None
canceled = False
removeTunnelWhenFinished = True
def _cancel(self, d):
self.bobProto.sender.transport.abortConnection()
self.canceled = True
def __init__(self, reactor, serverFactory, bobEndpoint, keyfile,
tunnelNick=None,
outhost='localhost',
outport=None,
options={}):
self._reactor = reactor
self._serverFactory = serverFactory
self._bobEndpoint = bobEndpoint
self._keyfile = keyfile
self._writeKeypair = False
self.tunnelNick = tunnelNick
self.outhost = outhost
self.outport = outport
self.options = options
self.deferred = Deferred(self._cancel)
def startFactory(self):
try:
f = open(self._keyfile, 'r')
self.keypair = f.read()
f.close()
except IOError:
self.keypair = None
self._writeKeypair = True
def buildProtocol(self, addr):
proto = self.protocol()
proto.factory = self
self.bobProto = proto
return proto
def bobConnectionFailed(self, reason):
if not self.canceled:
self.deferred.errback(reason)
# This method is not called if an endpoint deferred errbacks
def clientConnectionFailed(self, connector, reason):
self.bobConnectionFailed(reason)
def i2pTunnelCreated(self):
if self._writeKeypair:
try:
f = open(self._keyfile, 'w')
f.write(self.keypair)
f.close()
except IOError:
print('Could not save keypair')
# BOB will now forward data to a listener.
# BOB only forwards to TCP4 (for now).
serverEndpoint = TCP4ServerEndpoint(self._reactor, self.outport)
# Wrap the server Factory.
wrappedFactory = BOBServerFactoryWrapper(self._serverFactory,
self._bobEndpoint,
I2PAddress(self.localDest),
self.tunnelNick,
self.removeTunnelWhenFinished)
d = serverEndpoint.listen(wrappedFactory)
def handlePort(port):
if port is None:
self.deferred.cancel()
serverAddr = I2PAddress(self.localDest)
p = I2PListeningPort(port, wrappedFactory, serverAddr)
return p
d.addCallback(handlePort)
# When the Deferred returns an IListeningPort, pass it on.
d.chainDeferred(self.deferred)
class BOBFactoryWrapperCommon(object):
def __init__(self, wrappedFactory,
bobEndpoint,
localAddr,
tunnelNick,
removeTunnelWhenFinished):
self.w = wrappedFactory
self.bobEndpoint = bobEndpoint
self.localAddr = localAddr
self.tunnelNick = tunnelNick
self.removeTunnelWhenFinished = removeTunnelWhenFinished
def __getattr__(self, attr):
return getattr(self.w, attr)
class BOBClientFactoryWrapper(BOBFactoryWrapperCommon):
protocol = I2PClientTunnelProtocol
def setDest(self, dest):
self.dest = dest
def buildProtocol(self, addr):
wrappedProto = self.w.buildProtocol(addr)
proto = self.protocol(wrappedProto, self.localAddr, self.dest)
proto.factory = self
return proto
def i2pConnectionLost(self, wrappedProto, reason):
if self.removeTunnelWhenFinished:
# Notify the underlying Protocol once the tunnel has
# been removed, in case they stop the reactor.
rmTunnelFac = BOBI2PClientTunnelRemoverFactory(self.tunnelNick,
wrappedProto,
reason)
self.bobEndpoint.connect(rmTunnelFac)
else:
# Notify the underlying Protocol now.
wrappedProto.connectionLost(reason)
class BOBServerFactoryWrapper(BOBFactoryWrapperCommon):
protocol = I2PServerTunnelProtocol
def buildProtocol(self, addr):
wrappedProto = self.w.buildProtocol(addr)
proto = self.protocol(wrappedProto, self.localAddr)
proto.factory = self
return proto
def stopListening(self, wrappedPort):
if self.removeTunnelWhenFinished:
# Notify the underlying ListeningPort once the tunnel
# has been removed, in case they stop the reactor.
rmTunnelFac = BOBI2PServerTunnelRemoverFactory(self.tunnelNick,
wrappedPort)
self.bobEndpoint.connect(rmTunnelFac)
else:
# Notify the underlying ListeningPort now.
wrappedPort.stopListening()
class BOBI2PClientTunnelRemoverFactory(ClientFactory):
protocol = I2PTunnelRemoverBOBClient
def __init__(self, tunnelNick, protoToNotify, reason):
self.tunnelNick = tunnelNick
self._protoToNotify = protoToNotify
self._reason = reason
def i2pTunnelRemoved(self):
# Now that the I2P tunnel has been removed,
# notify the underlying Protocol.
self._protoToNotify.connectionLost(self._reason)
class BOBI2PServerTunnelRemoverFactory(ClientFactory):
protocol = I2PTunnelRemoverBOBClient
def __init__(self, tunnelNick, portToNotify):
self.tunnelNick = tunnelNick
self._portToNotify = portToNotify
def i2pTunnelRemoved(self):
# Now that the I2P tunnel has been removed,
# notify the underlying ListeningPort.
self._portToNotify.stopListening()
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