summaryrefslogtreecommitdiffstats
path: root/Lib/test/test_telnetlib.py
blob: ee1c35705bb0210e4c6f107eda0820c45637e83d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
import socket
import selectors
import telnetlib
import time
import contextlib

from unittest import TestCase
from test import support
threading = support.import_module('threading')

HOST = support.HOST

def server(evt, serv):
    serv.listen(5)
    evt.set()
    try:
        conn, addr = serv.accept()
        conn.close()
    except socket.timeout:
        pass
    finally:
        serv.close()

class GeneralTests(TestCase):

    def setUp(self):
        self.evt = threading.Event()
        self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        self.sock.settimeout(60)  # Safety net. Look issue 11812
        self.port = support.bind_port(self.sock)
        self.thread = threading.Thread(target=server, args=(self.evt,self.sock))
        self.thread.setDaemon(True)
        self.thread.start()
        self.evt.wait()

    def tearDown(self):
        self.thread.join()
        del self.thread  # Clear out any dangling Thread objects.

    def testBasic(self):
        # connects
        telnet = telnetlib.Telnet(HOST, self.port)
        telnet.sock.close()

    def testTimeoutDefault(self):
        self.assertTrue(socket.getdefaulttimeout() is None)
        socket.setdefaulttimeout(30)
        try:
            telnet = telnetlib.Telnet(HOST, self.port)
        finally:
            socket.setdefaulttimeout(None)
        self.assertEqual(telnet.sock.gettimeout(), 30)
        telnet.sock.close()

    def testTimeoutNone(self):
        # None, having other default
        self.assertTrue(socket.getdefaulttimeout() is None)
        socket.setdefaulttimeout(30)
        try:
            telnet = telnetlib.Telnet(HOST, self.port, timeout=None)
        finally:
            socket.setdefaulttimeout(None)
        self.assertTrue(telnet.sock.gettimeout() is None)
        telnet.sock.close()

    def testTimeoutValue(self):
        telnet = telnetlib.Telnet(HOST, self.port, timeout=30)
        self.assertEqual(telnet.sock.gettimeout(), 30)
        telnet.sock.close()

    def testTimeoutOpen(self):
        telnet = telnetlib.Telnet()
        telnet.open(HOST, self.port, timeout=30)
        self.assertEqual(telnet.sock.gettimeout(), 30)
        telnet.sock.close()

    def testGetters(self):
        # Test telnet getter methods
        telnet = telnetlib.Telnet(HOST, self.port, timeout=30)
        t_sock = telnet.sock
        self.assertEqual(telnet.get_socket(), t_sock)
        self.assertEqual(telnet.fileno(), t_sock.fileno())
        telnet.sock.close()

class SocketStub(object):
    ''' a socket proxy that re-defines sendall() '''
    def __init__(self, reads=()):
        self.reads = list(reads)  # Intentionally make a copy.
        self.writes = []
        self.block = False
    def sendall(self, data):
        self.writes.append(data)
    def recv(self, size):
        out = b''
        while self.reads and len(out) < size:
            out += self.reads.pop(0)
        if len(out) > size:
            self.reads.insert(0, out[size:])
            out = out[:size]
        return out

class TelnetAlike(telnetlib.Telnet):
    def fileno(self):
        raise NotImplementedError()
    def close(self): pass
    def sock_avail(self):
        return (not self.sock.block)
    def msg(self, msg, *args):
        with support.captured_stdout() as out:
            telnetlib.Telnet.msg(self, msg, *args)
        self._messages += out.getvalue()
        return

class MockSelector(selectors.BaseSelector):

    def __init__(self):
        self.keys = {}

    @property
    def resolution(self):
        return 1e-3

    def register(self, fileobj, events, data=None):
        key = selectors.SelectorKey(fileobj, 0, events, data)
        self.keys[fileobj] = key
        return key

    def unregister(self, fileobj):
        return self.keys.pop(fileobj)

    def select(self, timeout=None):
        block = False
        for fileobj in self.keys:
            if isinstance(fileobj, TelnetAlike):
                block = fileobj.sock.block
                break
        if block:
            return []
        else:
            return [(key, key.events) for key in self.keys.values()]

    def get_map(self):
        return self.keys


@contextlib.contextmanager
def test_socket(reads):
    def new_conn(*ignored):
        return SocketStub(reads)
    try:
        old_conn = socket.create_connection
        socket.create_connection = new_conn
        yield None
    finally:
        socket.create_connection = old_conn
    return

def test_telnet(reads=(), cls=TelnetAlike):
    ''' return a telnetlib.Telnet object that uses a SocketStub with
        reads queued up to be read '''
    for x in reads:
        assert type(x) is bytes, x
    with test_socket(reads):
        telnet = cls('dummy', 0)
        telnet._messages = '' # debuglevel output
    return telnet

class ExpectAndReadTestCase(TestCase):
    def setUp(self):
        self.old_selector = telnetlib._TelnetSelector
        telnetlib._TelnetSelector = MockSelector
    def tearDown(self):
        telnetlib._TelnetSelector = self.old_selector

class ReadTests(ExpectAndReadTestCase):
    def test_read_until(self):
        """
        read_until(expected, timeout=None)
        test the blocking version of read_util
        """
        want = [b'xxxmatchyyy']
        telnet = test_telnet(want)
        data = telnet.read_until(b'match')
        self.assertEqual(data, b'xxxmatch', msg=(telnet.cookedq, telnet.rawq, telnet.sock.reads))

        reads = [b'x' * 50, b'match', b'y' * 50]
        expect = b''.join(reads[:-1])
        telnet = test_telnet(reads)
        data = telnet.read_until(b'match')
        self.assertEqual(data, expect)


    def test_read_all(self):
        """
        read_all()
          Read all data until EOF; may block.
        """
        reads = [b'x' * 500, b'y' * 500, b'z' * 500]
        expect = b''.join(reads)
        telnet = test_telnet(reads)
        data = telnet.read_all()
        self.assertEqual(data, expect)
        return

    def test_read_some(self):
        """
        read_some()
          Read at least one byte or EOF; may block.
        """
        # test 'at least one byte'
        telnet = test_telnet([b'x' * 500])
        data = telnet.read_some()
        self.assertTrue(len(data) >= 1)
        # test EOF
        telnet = test_telnet()
        data = telnet.read_some()
        self.assertEqual(b'', data)

    def _read_eager(self, func_name):
        """
        read_*_eager()
          Read all data available already queued or on the socket,
          without blocking.
        """
        want = b'x' * 100
        telnet = test_telnet([want])
        func = getattr(telnet, func_name)
        telnet.sock.block = True
        self.assertEqual(b'', func())
        telnet.sock.block = False
        data = b''
        while True:
            try:
                data += func()
            except EOFError:
                break
        self.assertEqual(data, want)

    def test_read_eager(self):
        # read_eager and read_very_eager make the same gaurantees
        # (they behave differently but we only test the gaurantees)
        self._read_eager('read_eager')
        self._read_eager('read_very_eager')
        # NB -- we need to test the IAC block which is mentioned in the
        # docstring but not in the module docs

    def read_very_lazy(self):
        want = b'x' * 100
        telnet = test_telnet([want])
        self.assertEqual(b'', telnet.read_very_lazy())
        while telnet.sock.reads:
            telnet.fill_rawq()
        data = telnet.read_very_lazy()
        self.assertEqual(want, data)
        self.assertRaises(EOFError, telnet.read_very_lazy)

    def test_read_lazy(self):
        want = b'x' * 100
        telnet = test_telnet([want])
        self.assertEqual(b'', telnet.read_lazy())
        data = b''
        while True:
            try:
                read_data = telnet.read_lazy()
                data += read_data
                if not read_data:
                    telnet.fill_rawq()
            except EOFError:
                break
            self.assertTrue(want.startswith(data))
        self.assertEqual(data, want)

class nego_collector(object):
    def __init__(self, sb_getter=None):
        self.seen = b''
        self.sb_getter = sb_getter
        self.sb_seen = b''

    def do_nego(self, sock, cmd, opt):
        self.seen += cmd + opt
        if cmd == tl.SE and self.sb_getter:
            sb_data = self.sb_getter()
            self.sb_seen += sb_data

tl = telnetlib

class WriteTests(TestCase):
    '''The only thing that write does is replace each tl.IAC for
    tl.IAC+tl.IAC'''

    def test_write(self):
        data_sample = [b'data sample without IAC',
                       b'data sample with' + tl.IAC + b' one IAC',
                       b'a few' + tl.IAC + tl.IAC + b' iacs' + tl.IAC,
                       tl.IAC,
                       b'']
        for data in data_sample:
            telnet = test_telnet()
            telnet.write(data)
            written = b''.join(telnet.sock.writes)
            self.assertEqual(data.replace(tl.IAC,tl.IAC+tl.IAC), written)

class OptionTests(TestCase):
    # RFC 854 commands
    cmds = [tl.AO, tl.AYT, tl.BRK, tl.EC, tl.EL, tl.GA, tl.IP, tl.NOP]

    def _test_command(self, data):
        """ helper for testing IAC + cmd """
        telnet = test_telnet(data)
        data_len = len(b''.join(data))
        nego = nego_collector()
        telnet.set_option_negotiation_callback(nego.do_nego)
        txt = telnet.read_all()
        cmd = nego.seen
        self.assertTrue(len(cmd) > 0) # we expect at least one command
        self.assertIn(cmd[:1], self.cmds)
        self.assertEqual(cmd[1:2], tl.NOOPT)
        self.assertEqual(data_len, len(txt + cmd))
        nego.sb_getter = None # break the nego => telnet cycle

    def test_IAC_commands(self):
        for cmd in self.cmds:
            self._test_command([tl.IAC, cmd])
            self._test_command([b'x' * 100, tl.IAC, cmd, b'y'*100])
            self._test_command([b'x' * 10, tl.IAC, cmd, b'y'*10])
        # all at once
        self._test_command([tl.IAC + cmd for (cmd) in self.cmds])

    def test_SB_commands(self):
        # RFC 855, subnegotiations portion
        send = [tl.IAC + tl.SB + tl.IAC + tl.SE,
                tl.IAC + tl.SB + tl.IAC + tl.IAC + tl.IAC + tl.SE,
                tl.IAC + tl.SB + tl.IAC + tl.IAC + b'aa' + tl.IAC + tl.SE,
                tl.IAC + tl.SB + b'bb' + tl.IAC + tl.IAC + tl.IAC + tl.SE,
                tl.IAC + tl.SB + b'cc' + tl.IAC + tl.IAC + b'dd' + tl.IAC + tl.SE,
               ]
        telnet = test_telnet(send)
        nego = nego_collector(telnet.read_sb_data)
        telnet.set_option_negotiation_callback(nego.do_nego)
        txt = telnet.read_all()
        self.assertEqual(txt, b'')
        want_sb_data = tl.IAC + tl.IAC + b'aabb' + tl.IAC + b'cc' + tl.IAC + b'dd'
        self.assertEqual(nego.sb_seen, want_sb_data)
        self.assertEqual(b'', telnet.read_sb_data())
        nego.sb_getter = None # break the nego => telnet cycle

    def test_debuglevel_reads(self):
        # test all the various places that self.msg(...) is called
        given_a_expect_b = [
            # Telnet.fill_rawq
            (b'a', ": recv b''\n"),
            # Telnet.process_rawq
            (tl.IAC + bytes([88]), ": IAC 88 not recognized\n"),
            (tl.IAC + tl.DO + bytes([1]), ": IAC DO 1\n"),
            (tl.IAC + tl.DONT + bytes([1]), ": IAC DONT 1\n"),
            (tl.IAC + tl.WILL + bytes([1]), ": IAC WILL 1\n"),
            (tl.IAC + tl.WONT + bytes([1]), ": IAC WONT 1\n"),
           ]
        for a, b in given_a_expect_b:
            telnet = test_telnet([a])
            telnet.set_debuglevel(1)
            txt = telnet.read_all()
            self.assertIn(b, telnet._messages)
        return

    def test_debuglevel_write(self):
        telnet = test_telnet()
        telnet.set_debuglevel(1)
        telnet.write(b'xxx')
        expected = "send b'xxx'\n"
        self.assertIn(expected, telnet._messages)

    def test_debug_accepts_str_port(self):
        # Issue 10695
        with test_socket([]):
            telnet = TelnetAlike('dummy', '0')
            telnet._messages = ''
        telnet.set_debuglevel(1)
        telnet.msg('test')
        self.assertRegex(telnet._messages, r'0.*test')


class ExpectTests(ExpectAndReadTestCase):
    def test_expect(self):
        """
        expect(expected, [timeout])
          Read until the expected string has been seen, or a timeout is
          hit (default is no timeout); may block.
        """
        want = [b'x' * 10, b'match', b'y' * 10]
        telnet = test_telnet(want)
        (_,_,data) = telnet.expect([b'match'])
        self.assertEqual(data, b''.join(want[:-1]))


def test_main(verbose=None):
    support.run_unittest(GeneralTests, ReadTests, WriteTests, OptionTests,
                         ExpectTests)

if __name__ == '__main__':
    test_main()