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# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Tests for L{twisted.conch.ssh.forwarding}.
"""
from __future__ import division, absolute_import
from twisted.python.reflect import requireModule
cryptography = requireModule("cryptography")
if cryptography:
from twisted.conch.ssh import forwarding
from twisted.internet.address import IPv6Address
from twisted.trial import unittest
from twisted.internet.test.test_endpoints import deterministicResolvingReactor
from twisted.test.proto_helpers import MemoryReactorClock, StringTransport
class TestSSHConnectForwardingChannel(unittest.TestCase):
"""
Unit and integration tests for L{SSHConnectForwardingChannel}.
"""
if not cryptography:
skip = "Cannot run without cryptography"
def makeTCPConnection(self, reactor):
"""
Fake that connection was established for first connectTCP request made
on C{reactor}.
@param reactor: Reactor on which to fake the connection.
@type reactor: A reactor.
"""
factory = reactor.tcpClients[0][2]
connector = reactor.connectors[0]
protocol = factory.buildProtocol(None)
transport = StringTransport(peerAddress=connector.getDestination())
protocol.makeConnection(transport)
def test_channelOpenHostnameRequests(self):
"""
When a hostname is sent as part of forwarding requests, it
is resolved using HostnameEndpoint's resolver.
"""
sut = forwarding.SSHConnectForwardingChannel(
hostport=('fwd.example.org', 1234))
# Patch channel and resolver to not touch the network.
memoryReactor = MemoryReactorClock()
sut._reactor = deterministicResolvingReactor(memoryReactor, ['::1'])
sut.channelOpen(None)
self.makeTCPConnection(memoryReactor)
self.successResultOf(sut._channelOpenDeferred)
# Channel is connected using a forwarding client to the resolved
# address of the requested host.
self.assertIsInstance(sut.client, forwarding.SSHForwardingClient)
self.assertEqual(
IPv6Address('TCP', '::1', 1234), sut.client.transport.getPeer())
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