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
|
from netlib import tcp
from netlib import test
from netlib import websockets
import io
import os
from nose.tools import raises
class WebSocketsEchoHandler(tcp.BaseHandler):
def __init__(self, connection, address, server):
super(WebSocketsEchoHandler, self).__init__(
connection, address, server
)
self.handshake_done = False
def handle(self):
while True:
if not self.handshake_done:
self.handshake()
else:
self.read_next_message()
def read_next_message(self):
decoded = websockets.Frame.from_file(self.rfile).decoded_payload
self.on_message(decoded)
def send_message(self, message):
frame = websockets.Frame.default(message, from_client = False)
frame.to_file(self.wfile)
def handshake(self):
client_hs = websockets.read_handshake(self.rfile, 1)
key = websockets.process_handshake_from_client(client_hs)
response = websockets.create_server_handshake(key)
self.wfile.write(response)
self.wfile.flush()
self.handshake_done = True
def on_message(self, message):
if message is not None:
self.send_message(message)
class WebSocketsClient(tcp.TCPClient):
def __init__(self, address, source_address=None):
super(WebSocketsClient, self).__init__(address, source_address)
self.version = "13"
self.client_nounce = websockets.create_client_nounce()
self.resource = "/"
def connect(self):
super(WebSocketsClient, self).connect()
handshake = websockets.create_client_handshake(
self.address.host,
self.address.port,
self.client_nounce,
self.version,
self.resource
)
self.wfile.write(handshake)
self.wfile.flush()
server_handshake = websockets.read_handshake(self.rfile, 1)
server_nounce = websockets.process_handshake_from_server(server_handshake)
if not server_nounce == websockets.create_server_nounce(self.client_nounce):
self.close()
def read_next_message(self):
return websockets.Frame.from_file(self.rfile).payload
def send_message(self, message):
frame = websockets.Frame.default(message, from_client = True)
frame.to_file(self.wfile)
class TestWebSockets(test.ServerTestBase):
handler = WebSocketsEchoHandler
def random_bytes(self, n = 100):
return os.urandom(n)
def echo(self, msg):
client = WebSocketsClient(("127.0.0.1", self.port))
client.connect()
client.send_message(msg)
response = client.read_next_message()
assert response == msg
def test_simple_echo(self):
self.echo("hello I'm the client")
def test_frame_sizes(self):
# length can fit in the the 7 bit payload length
small_msg = self.random_bytes(100)
# 50kb, sligthly larger than can fit in a 7 bit int
medium_msg = self.random_bytes(50000)
# 150kb, slightly larger than can fit in a 16 bit int
large_msg = self.random_bytes(150000)
self.echo(small_msg)
self.echo(medium_msg)
self.echo(large_msg)
def test_default_builder(self):
"""
default builder should always generate valid frames
"""
msg = self.random_bytes()
client_frame = websockets.Frame.default(msg, from_client = True)
assert client_frame.is_valid()
server_frame = websockets.Frame.default(msg, from_client = False)
assert server_frame.is_valid()
def test_serialization_bijection(self):
"""
Ensure that various frame types can be serialized/deserialized back
and forth between to_bytes() and from_bytes()
"""
for is_client in [True, False]:
for num_bytes in [100, 50000, 150000]:
frame = websockets.Frame.default(
self.random_bytes(num_bytes), is_client
)
assert frame == websockets.Frame.from_bytes(frame.safe_to_bytes())
bytes = b'\x81\x03cba'
assert websockets.Frame.from_bytes(bytes).safe_to_bytes() == bytes
@raises(websockets.WebSocketFrameValidationException)
def test_safe_to_bytes(self):
frame = websockets.Frame.default(self.random_bytes(8))
frame.actual_payload_length = 1 # corrupt the frame
frame.safe_to_bytes()
def test_handshake(self):
bad_upgrade = "not_websockets"
bad_header_handshake = websockets.build_handshake([
('Host', '%s:%s' % ("a", "b")),
('Connection', "c"),
('Upgrade', bad_upgrade),
('Sec-WebSocket-Key', "d"),
('Sec-WebSocket-Version', "e")
], "f")
# check behavior when required header values are missing
assert None == websockets.process_handshake_from_server(bad_header_handshake)
assert None == websockets.process_handshake_from_client(bad_header_handshake)
key = "test_key"
client_handshake = websockets.create_client_handshake("a","b",key,"d","e")
assert key == websockets.process_handshake_from_client(client_handshake)
server_handshake = websockets.create_server_handshake(key)
assert websockets.create_server_nounce(key) == websockets.process_handshake_from_server(server_handshake)
handshake = websockets.create_client_handshake("a","b","c","d","e")
stream = io.BytesIO(handshake)
assert handshake == websockets.read_handshake(stream, 1)
# ensure readhandshake doesn't loop forever on empty stream
empty_stream = io.BytesIO("")
assert "" == websockets.read_handshake(empty_stream, 1)
class BadHandshakeHandler(WebSocketsEchoHandler):
def handshake(self):
client_hs = websockets.read_handshake(self.rfile, 1)
websockets.process_handshake_from_client(client_hs)
response = websockets.create_server_handshake("malformed_key")
self.wfile.write(response)
self.wfile.flush()
self.handshake_done = True
class TestBadHandshake(test.ServerTestBase):
"""
Ensure that the client disconnects if the server handshake is malformed
"""
handler = BadHandshakeHandler
@raises(tcp.NetLibDisconnect)
def test(self):
client = WebSocketsClient(("127.0.0.1", self.port))
client.connect()
client.send_message("hello")
|
