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402 lines
13 KiB
Python
402 lines
13 KiB
Python
import socket
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import selectors
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import telnetlib
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import threading
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import contextlib
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from test import support
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import unittest
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HOST = support.HOST
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def server(evt, serv):
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serv.listen()
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evt.set()
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try:
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conn, addr = serv.accept()
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conn.close()
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except socket.timeout:
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pass
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finally:
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serv.close()
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class GeneralTests(unittest.TestCase):
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def setUp(self):
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self.evt = threading.Event()
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self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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self.sock.settimeout(60) # Safety net. Look issue 11812
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self.port = support.bind_port(self.sock)
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self.thread = threading.Thread(target=server, args=(self.evt,self.sock))
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self.thread.setDaemon(True)
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self.thread.start()
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self.evt.wait()
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def tearDown(self):
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self.thread.join()
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del self.thread # Clear out any dangling Thread objects.
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def testBasic(self):
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# connects
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telnet = telnetlib.Telnet(HOST, self.port)
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telnet.sock.close()
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def testContextManager(self):
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with telnetlib.Telnet(HOST, self.port) as tn:
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self.assertIsNotNone(tn.get_socket())
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self.assertIsNone(tn.get_socket())
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def testTimeoutDefault(self):
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self.assertTrue(socket.getdefaulttimeout() is None)
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socket.setdefaulttimeout(30)
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try:
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telnet = telnetlib.Telnet(HOST, self.port)
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finally:
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socket.setdefaulttimeout(None)
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self.assertEqual(telnet.sock.gettimeout(), 30)
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telnet.sock.close()
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def testTimeoutNone(self):
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# None, having other default
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self.assertTrue(socket.getdefaulttimeout() is None)
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socket.setdefaulttimeout(30)
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try:
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telnet = telnetlib.Telnet(HOST, self.port, timeout=None)
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finally:
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socket.setdefaulttimeout(None)
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self.assertTrue(telnet.sock.gettimeout() is None)
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telnet.sock.close()
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def testTimeoutValue(self):
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telnet = telnetlib.Telnet(HOST, self.port, timeout=30)
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self.assertEqual(telnet.sock.gettimeout(), 30)
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telnet.sock.close()
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def testTimeoutOpen(self):
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telnet = telnetlib.Telnet()
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telnet.open(HOST, self.port, timeout=30)
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self.assertEqual(telnet.sock.gettimeout(), 30)
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telnet.sock.close()
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def testGetters(self):
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# Test telnet getter methods
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telnet = telnetlib.Telnet(HOST, self.port, timeout=30)
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t_sock = telnet.sock
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self.assertEqual(telnet.get_socket(), t_sock)
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self.assertEqual(telnet.fileno(), t_sock.fileno())
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telnet.sock.close()
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class SocketStub(object):
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''' a socket proxy that re-defines sendall() '''
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def __init__(self, reads=()):
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self.reads = list(reads) # Intentionally make a copy.
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self.writes = []
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self.block = False
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def sendall(self, data):
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self.writes.append(data)
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def recv(self, size):
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out = b''
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while self.reads and len(out) < size:
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out += self.reads.pop(0)
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if len(out) > size:
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self.reads.insert(0, out[size:])
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out = out[:size]
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return out
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class TelnetAlike(telnetlib.Telnet):
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def fileno(self):
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raise NotImplementedError()
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def close(self): pass
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def sock_avail(self):
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return (not self.sock.block)
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def msg(self, msg, *args):
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with support.captured_stdout() as out:
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telnetlib.Telnet.msg(self, msg, *args)
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self._messages += out.getvalue()
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return
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class MockSelector(selectors.BaseSelector):
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def __init__(self):
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self.keys = {}
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@property
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def resolution(self):
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return 1e-3
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def register(self, fileobj, events, data=None):
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key = selectors.SelectorKey(fileobj, 0, events, data)
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self.keys[fileobj] = key
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return key
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def unregister(self, fileobj):
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return self.keys.pop(fileobj)
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def select(self, timeout=None):
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block = False
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for fileobj in self.keys:
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if isinstance(fileobj, TelnetAlike):
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block = fileobj.sock.block
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break
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if block:
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return []
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else:
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return [(key, key.events) for key in self.keys.values()]
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def get_map(self):
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return self.keys
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@contextlib.contextmanager
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def test_socket(reads):
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def new_conn(*ignored):
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return SocketStub(reads)
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try:
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old_conn = socket.create_connection
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socket.create_connection = new_conn
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yield None
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finally:
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socket.create_connection = old_conn
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return
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def test_telnet(reads=(), cls=TelnetAlike):
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''' return a telnetlib.Telnet object that uses a SocketStub with
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reads queued up to be read '''
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for x in reads:
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assert type(x) is bytes, x
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with test_socket(reads):
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telnet = cls('dummy', 0)
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telnet._messages = '' # debuglevel output
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return telnet
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class ExpectAndReadTestCase(unittest.TestCase):
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def setUp(self):
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self.old_selector = telnetlib._TelnetSelector
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telnetlib._TelnetSelector = MockSelector
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def tearDown(self):
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telnetlib._TelnetSelector = self.old_selector
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class ReadTests(ExpectAndReadTestCase):
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def test_read_until(self):
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"""
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read_until(expected, timeout=None)
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test the blocking version of read_util
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"""
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want = [b'xxxmatchyyy']
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telnet = test_telnet(want)
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data = telnet.read_until(b'match')
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self.assertEqual(data, b'xxxmatch', msg=(telnet.cookedq, telnet.rawq, telnet.sock.reads))
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reads = [b'x' * 50, b'match', b'y' * 50]
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expect = b''.join(reads[:-1])
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telnet = test_telnet(reads)
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data = telnet.read_until(b'match')
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self.assertEqual(data, expect)
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def test_read_all(self):
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"""
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read_all()
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Read all data until EOF; may block.
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"""
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reads = [b'x' * 500, b'y' * 500, b'z' * 500]
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expect = b''.join(reads)
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telnet = test_telnet(reads)
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data = telnet.read_all()
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self.assertEqual(data, expect)
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return
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def test_read_some(self):
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"""
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read_some()
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Read at least one byte or EOF; may block.
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"""
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# test 'at least one byte'
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telnet = test_telnet([b'x' * 500])
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data = telnet.read_some()
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self.assertTrue(len(data) >= 1)
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# test EOF
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telnet = test_telnet()
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data = telnet.read_some()
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self.assertEqual(b'', data)
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def _read_eager(self, func_name):
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"""
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read_*_eager()
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Read all data available already queued or on the socket,
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without blocking.
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"""
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want = b'x' * 100
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telnet = test_telnet([want])
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func = getattr(telnet, func_name)
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telnet.sock.block = True
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self.assertEqual(b'', func())
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telnet.sock.block = False
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data = b''
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while True:
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try:
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data += func()
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except EOFError:
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break
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self.assertEqual(data, want)
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def test_read_eager(self):
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# read_eager and read_very_eager make the same guarantees
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# (they behave differently but we only test the guarantees)
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self._read_eager('read_eager')
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self._read_eager('read_very_eager')
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# NB -- we need to test the IAC block which is mentioned in the
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# docstring but not in the module docs
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def read_very_lazy(self):
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want = b'x' * 100
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telnet = test_telnet([want])
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self.assertEqual(b'', telnet.read_very_lazy())
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while telnet.sock.reads:
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telnet.fill_rawq()
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data = telnet.read_very_lazy()
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self.assertEqual(want, data)
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self.assertRaises(EOFError, telnet.read_very_lazy)
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def test_read_lazy(self):
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want = b'x' * 100
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telnet = test_telnet([want])
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self.assertEqual(b'', telnet.read_lazy())
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data = b''
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while True:
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try:
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read_data = telnet.read_lazy()
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data += read_data
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if not read_data:
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telnet.fill_rawq()
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except EOFError:
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break
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self.assertTrue(want.startswith(data))
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self.assertEqual(data, want)
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class nego_collector(object):
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def __init__(self, sb_getter=None):
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self.seen = b''
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self.sb_getter = sb_getter
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self.sb_seen = b''
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def do_nego(self, sock, cmd, opt):
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self.seen += cmd + opt
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if cmd == tl.SE and self.sb_getter:
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sb_data = self.sb_getter()
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self.sb_seen += sb_data
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tl = telnetlib
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class WriteTests(unittest.TestCase):
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'''The only thing that write does is replace each tl.IAC for
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tl.IAC+tl.IAC'''
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def test_write(self):
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data_sample = [b'data sample without IAC',
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b'data sample with' + tl.IAC + b' one IAC',
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b'a few' + tl.IAC + tl.IAC + b' iacs' + tl.IAC,
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tl.IAC,
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b'']
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for data in data_sample:
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telnet = test_telnet()
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telnet.write(data)
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written = b''.join(telnet.sock.writes)
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self.assertEqual(data.replace(tl.IAC,tl.IAC+tl.IAC), written)
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class OptionTests(unittest.TestCase):
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# RFC 854 commands
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cmds = [tl.AO, tl.AYT, tl.BRK, tl.EC, tl.EL, tl.GA, tl.IP, tl.NOP]
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def _test_command(self, data):
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""" helper for testing IAC + cmd """
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telnet = test_telnet(data)
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data_len = len(b''.join(data))
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nego = nego_collector()
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telnet.set_option_negotiation_callback(nego.do_nego)
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txt = telnet.read_all()
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cmd = nego.seen
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self.assertTrue(len(cmd) > 0) # we expect at least one command
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self.assertIn(cmd[:1], self.cmds)
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self.assertEqual(cmd[1:2], tl.NOOPT)
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self.assertEqual(data_len, len(txt + cmd))
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nego.sb_getter = None # break the nego => telnet cycle
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def test_IAC_commands(self):
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for cmd in self.cmds:
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self._test_command([tl.IAC, cmd])
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self._test_command([b'x' * 100, tl.IAC, cmd, b'y'*100])
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self._test_command([b'x' * 10, tl.IAC, cmd, b'y'*10])
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# all at once
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self._test_command([tl.IAC + cmd for (cmd) in self.cmds])
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def test_SB_commands(self):
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# RFC 855, subnegotiations portion
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send = [tl.IAC + tl.SB + tl.IAC + tl.SE,
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tl.IAC + tl.SB + tl.IAC + tl.IAC + tl.IAC + tl.SE,
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tl.IAC + tl.SB + tl.IAC + tl.IAC + b'aa' + tl.IAC + tl.SE,
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tl.IAC + tl.SB + b'bb' + tl.IAC + tl.IAC + tl.IAC + tl.SE,
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tl.IAC + tl.SB + b'cc' + tl.IAC + tl.IAC + b'dd' + tl.IAC + tl.SE,
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]
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telnet = test_telnet(send)
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nego = nego_collector(telnet.read_sb_data)
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telnet.set_option_negotiation_callback(nego.do_nego)
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txt = telnet.read_all()
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self.assertEqual(txt, b'')
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want_sb_data = tl.IAC + tl.IAC + b'aabb' + tl.IAC + b'cc' + tl.IAC + b'dd'
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self.assertEqual(nego.sb_seen, want_sb_data)
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self.assertEqual(b'', telnet.read_sb_data())
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nego.sb_getter = None # break the nego => telnet cycle
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def test_debuglevel_reads(self):
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# test all the various places that self.msg(...) is called
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given_a_expect_b = [
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# Telnet.fill_rawq
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(b'a', ": recv b''\n"),
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# Telnet.process_rawq
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(tl.IAC + bytes([88]), ": IAC 88 not recognized\n"),
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(tl.IAC + tl.DO + bytes([1]), ": IAC DO 1\n"),
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(tl.IAC + tl.DONT + bytes([1]), ": IAC DONT 1\n"),
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(tl.IAC + tl.WILL + bytes([1]), ": IAC WILL 1\n"),
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(tl.IAC + tl.WONT + bytes([1]), ": IAC WONT 1\n"),
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]
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for a, b in given_a_expect_b:
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telnet = test_telnet([a])
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telnet.set_debuglevel(1)
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txt = telnet.read_all()
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self.assertIn(b, telnet._messages)
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return
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def test_debuglevel_write(self):
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telnet = test_telnet()
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telnet.set_debuglevel(1)
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telnet.write(b'xxx')
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expected = "send b'xxx'\n"
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self.assertIn(expected, telnet._messages)
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def test_debug_accepts_str_port(self):
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# Issue 10695
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with test_socket([]):
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telnet = TelnetAlike('dummy', '0')
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telnet._messages = ''
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telnet.set_debuglevel(1)
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telnet.msg('test')
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self.assertRegex(telnet._messages, r'0.*test')
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class ExpectTests(ExpectAndReadTestCase):
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def test_expect(self):
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"""
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expect(expected, [timeout])
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Read until the expected string has been seen, or a timeout is
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hit (default is no timeout); may block.
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"""
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want = [b'x' * 10, b'match', b'y' * 10]
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telnet = test_telnet(want)
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(_,_,data) = telnet.expect([b'match'])
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self.assertEqual(data, b''.join(want[:-1]))
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if __name__ == '__main__':
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unittest.main()
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