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""" 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), '') self.assertEqual( str(channel.SSHChannel(localWindow=1)), '') 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'') self.assertEqual( channel.SSHChannel(localWindow=1).__bytes__(), b'') 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())