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# Copyright Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Test ssh/channel.py.
"""
from __future__ import division, absolute_import
from zope.interface.verify import verifyObject
try:
from twisted.conch.ssh import channel
from twisted.conch.ssh.address import SSHTransportAddress
from twisted.conch.ssh.transport import SSHServerTransport
from twisted.conch.ssh.service import SSHService
from twisted.internet import interfaces
from twisted.internet.address import IPv4Address
from twisted.test.proto_helpers import StringTransport
skipTest = None
except ImportError:
skipTest = 'Conch SSH not supported.'
SSHService = object
from twisted.trial import unittest
from twisted.python.compat import intToBytes
class MockConnection(SSHService):
"""
A mock for twisted.conch.ssh.connection.SSHConnection. Record the data
that channels send, and when they try to close the connection.
@ivar data: a L{dict} mapping channel id #s to lists of data sent by that
channel.
@ivar extData: a L{dict} mapping channel id #s to lists of 2-tuples
(extended data type, data) sent by that channel.
@ivar closes: a L{dict} mapping channel id #s to True if that channel sent
a close message.
"""
def __init__(self):
self.data = {}
self.extData = {}
self.closes = {}
def logPrefix(self):
"""
Return our logging prefix.
"""
return "MockConnection"
def sendData(self, channel, data):
"""
Record the sent data.
"""
self.data.setdefault(channel, []).append(data)
def sendExtendedData(self, channel, type, data):
"""
Record the sent extended data.
"""
self.extData.setdefault(channel, []).append((type, data))
def sendClose(self, channel):
"""
Record that the channel sent a close message.
"""
self.closes[channel] = True
def connectSSHTransport(service, hostAddress=None, peerAddress=None):
"""
Connect a SSHTransport which is already connected to a remote peer to
the channel under test.
@param service: Service used over the connected transport.
@type service: L{SSHService}
@param hostAddress: Local address of the connected transport.
@type hostAddress: L{interfaces.IAddress}
@param peerAddress: Remote address of the connected transport.
@type peerAddress: L{interfaces.IAddress}
"""
transport = SSHServerTransport()
transport.makeConnection(StringTransport(
hostAddress=hostAddress, peerAddress=peerAddress))
transport.setService(service)
class ChannelTests(unittest.TestCase):
"""
Tests for L{SSHChannel}.
"""
skip = skipTest
def setUp(self):
"""
Initialize the channel. remoteMaxPacket is 10 so that data is able
to be sent (the default of 0 means no data is sent because no packets
are made).
"""
self.conn = MockConnection()
self.channel = channel.SSHChannel(conn=self.conn,
remoteMaxPacket=10)
self.channel.name = b'channel'
def test_interface(self):
"""
L{SSHChannel} instances provide L{interfaces.ITransport}.
"""
self.assertTrue(verifyObject(interfaces.ITransport, self.channel))
def test_init(self):
"""
Test that SSHChannel initializes correctly. localWindowSize defaults
to 131072 (2**17) and localMaxPacket to 32768 (2**15) as reasonable
defaults (what OpenSSH uses for those variables).
The values in the second set of assertions are meaningless; they serve
only to verify that the instance variables are assigned in the correct
order.
"""
c = channel.SSHChannel(conn=self.conn)
self.assertEqual(c.localWindowSize, 131072)
self.assertEqual(c.localWindowLeft, 131072)
self.assertEqual(c.localMaxPacket, 32768)
self.assertEqual(c.remoteWindowLeft, 0)
self.assertEqual(c.remoteMaxPacket, 0)
self.assertEqual(c.conn, self.conn)
self.assertIsNone(c.data)
self.assertIsNone(c.avatar)
c2 = channel.SSHChannel(1, 2, 3, 4, 5, 6, 7)
self.assertEqual(c2.localWindowSize, 1)
self.assertEqual(c2.localWindowLeft, 1)
self.assertEqual(c2.localMaxPacket, 2)
self.assertEqual(c2.remoteWindowLeft, 3)
self.assertEqual(c2.remoteMaxPacket, 4)
self.assertEqual(c2.conn, 5)
self.assertEqual(c2.data, 6)
self.assertEqual(c2.avatar, 7)
def test_str(self):
"""
Test that str(SSHChannel) works gives the channel name and local and
remote windows at a glance..
"""
self.assertEqual(
str(self.channel), '<SSHChannel channel (lw 131072 rw 0)>')
self.assertEqual(
str(channel.SSHChannel(localWindow=1)),
'<SSHChannel None (lw 1 rw 0)>')
def test_bytes(self):
"""
Test that bytes(SSHChannel) works, gives the channel name and
local and remote windows at a glance..
"""
self.assertEqual(
self.channel.__bytes__(),
b'<SSHChannel channel (lw 131072 rw 0)>')
self.assertEqual(
channel.SSHChannel(localWindow=1).__bytes__(),
b'<SSHChannel None (lw 1 rw 0)>')
def test_logPrefix(self):
"""
Test that SSHChannel.logPrefix gives the name of the channel, the
local channel ID and the underlying connection.
"""
self.assertEqual(self.channel.logPrefix(), 'SSHChannel channel '
'(unknown) on MockConnection')
def test_addWindowBytes(self):
"""
Test that addWindowBytes adds bytes to the window and resumes writing
if it was paused.
"""
cb = [False]
def stubStartWriting():
cb[0] = True
self.channel.startWriting = stubStartWriting
self.channel.write(b'test')
self.channel.writeExtended(1, b'test')
self.channel.addWindowBytes(50)
self.assertEqual(self.channel.remoteWindowLeft, 50 - 4 - 4)
self.assertTrue(self.channel.areWriting)
self.assertTrue(cb[0])
self.assertEqual(self.channel.buf, b'')
self.assertEqual(self.conn.data[self.channel], [b'test'])
self.assertEqual(self.channel.extBuf, [])
self.assertEqual(self.conn.extData[self.channel], [(1, b'test')])
cb[0] = False
self.channel.addWindowBytes(20)
self.assertFalse(cb[0])
self.channel.write(b'a'*80)
self.channel.loseConnection()
self.channel.addWindowBytes(20)
self.assertFalse(cb[0])
def test_requestReceived(self):
"""
Test that requestReceived handles requests by dispatching them to
request_* methods.
"""
self.channel.request_test_method = lambda data: data == b''
self.assertTrue(self.channel.requestReceived(b'test-method', b''))
self.assertFalse(self.channel.requestReceived(b'test-method', b'a'))
self.assertFalse(self.channel.requestReceived(b'bad-method', b''))
def test_closeReceieved(self):
"""
Test that the default closeReceieved closes the connection.
"""
self.assertFalse(self.channel.closing)
self.channel.closeReceived()
self.assertTrue(self.channel.closing)
def test_write(self):
"""
Test that write handles data correctly. Send data up to the size
of the remote window, splitting the data into packets of length
remoteMaxPacket.
"""
cb = [False]
def stubStopWriting():
cb[0] = True
# no window to start with
self.channel.stopWriting = stubStopWriting
self.channel.write(b'd')
self.channel.write(b'a')
self.assertFalse(self.channel.areWriting)
self.assertTrue(cb[0])
# regular write
self.channel.addWindowBytes(20)
self.channel.write(b'ta')
data = self.conn.data[self.channel]
self.assertEqual(data, [b'da', b'ta'])
self.assertEqual(self.channel.remoteWindowLeft, 16)
# larger than max packet
self.channel.write(b'12345678901')
self.assertEqual(data, [b'da', b'ta', b'1234567890', b'1'])
self.assertEqual(self.channel.remoteWindowLeft, 5)
# running out of window
cb[0] = False
self.channel.write(b'123456')
self.assertFalse(self.channel.areWriting)
self.assertTrue(cb[0])
self.assertEqual(data, [b'da', b'ta', b'1234567890', b'1', b'12345'])
self.assertEqual(self.channel.buf, b'6')
self.assertEqual(self.channel.remoteWindowLeft, 0)
def test_writeExtended(self):
"""
Test that writeExtended handles data correctly. Send extended data
up to the size of the window, splitting the extended data into packets
of length remoteMaxPacket.
"""
cb = [False]
def stubStopWriting():
cb[0] = True
# no window to start with
self.channel.stopWriting = stubStopWriting
self.channel.writeExtended(1, b'd')
self.channel.writeExtended(1, b'a')
self.channel.writeExtended(2, b't')
self.assertFalse(self.channel.areWriting)
self.assertTrue(cb[0])
# regular write
self.channel.addWindowBytes(20)
self.channel.writeExtended(2, b'a')
data = self.conn.extData[self.channel]
self.assertEqual(data, [(1, b'da'), (2, b't'), (2, b'a')])
self.assertEqual(self.channel.remoteWindowLeft, 16)
# larger than max packet
self.channel.writeExtended(3, b'12345678901')
self.assertEqual(data, [(1, b'da'), (2, b't'), (2, b'a'),
(3, b'1234567890'), (3, b'1')])
self.assertEqual(self.channel.remoteWindowLeft, 5)
# running out of window
cb[0] = False
self.channel.writeExtended(4, b'123456')
self.assertFalse(self.channel.areWriting)
self.assertTrue(cb[0])
self.assertEqual(data, [(1, b'da'), (2, b't'), (2, b'a'),
(3, b'1234567890'), (3, b'1'), (4, b'12345')])
self.assertEqual(self.channel.extBuf, [[4, b'6']])
self.assertEqual(self.channel.remoteWindowLeft, 0)
def test_writeSequence(self):
"""
Test that writeSequence is equivalent to write(''.join(sequece)).
"""
self.channel.addWindowBytes(20)
self.channel.writeSequence(map(intToBytes, range(10)))
self.assertEqual(self.conn.data[self.channel], [b'0123456789'])
def test_loseConnection(self):
"""
Tesyt that loseConnection() doesn't close the channel until all
the data is sent.
"""
self.channel.write(b'data')
self.channel.writeExtended(1, b'datadata')
self.channel.loseConnection()
self.assertIsNone(self.conn.closes.get(self.channel))
self.channel.addWindowBytes(4) # send regular data
self.assertIsNone(self.conn.closes.get(self.channel))
self.channel.addWindowBytes(8) # send extended data
self.assertTrue(self.conn.closes.get(self.channel))
def test_getPeer(self):
"""
L{SSHChannel.getPeer} returns the same object as the underlying
transport's C{getPeer} method returns.
"""
peer = IPv4Address('TCP', '192.168.0.1', 54321)
connectSSHTransport(service=self.channel.conn, peerAddress=peer)
self.assertEqual(SSHTransportAddress(peer), self.channel.getPeer())
def test_getHost(self):
"""
L{SSHChannel.getHost} returns the same object as the underlying
transport's C{getHost} method returns.
"""
host = IPv4Address('TCP', '127.0.0.1', 12345)
connectSSHTransport(service=self.channel.conn, hostAddress=host)
self.assertEqual(SSHTransportAddress(host), self.channel.getHost())