def test_mask(self):
# Sample input e6,97,a5 is U+65e5 in UTF-8
masker = util.RepeatedXorMasker(b'\xff\xff\xff\xff')
result = masker.mask(b'\xe6\x97\xa5')
self.assertEqual(b'\x19\x68\x5a', result)
masker = util.RepeatedXorMasker(b'\x00\x00\x00\x00')
result = masker.mask(b'\xe6\x97\xa5')
self.assertEqual(b'\xe6\x97\xa5', result)
masker = util.RepeatedXorMasker(b'\xe6\x97\xa5\x20')
result = masker.mask(b'\xe6\x97\xa5')
self.assertEqual(b'\x00\x00\x00', result)
def _build_frame(header, body, mask):
if not mask:
return header + body
masking_nonce = os.urandom(4)
masker = util.RepeatedXorMasker(masking_nonce)
return header + masking_nonce + masker.mask(body)
def test_mask_twice(self):
masker = util.RepeatedXorMasker(b'\x00\x7f\xff\x20')
# mask[0], mask[1], ... will be used.
result = masker.mask(b'\x00\x00\x00\x00\x00')
self.assertEqual(b'\x00\x7f\xff\x20\x00', result)
# mask[2], mask[0], ... will be used for the next call.
result = masker.mask(b'\x00\x00\x00\x00\x00')
self.assertEqual(b'\x7f\xff\x20\x00\x7f', result)
def test_mask_large_data(self):
masker = util.RepeatedXorMasker('mASk')
original = ''.join([chr(i % 256) for i in xrange(1000)])
result = masker.mask(original)
expected = ''.join(
[chr((i % 256) ^ ord('mASk'[i % 4])) for i in xrange(1000)])
self.assertEqual(expected, result)
masker = util.RepeatedXorMasker('MaSk')
first_part = 'The WebSocket Protocol enables two-way communication.'
result = masker.mask(first_part)
self.assertEqual(
'\x19\t6K\x1a\x0418"\x028\x0e9A\x03\x19"\x15<\x08"\rs\x0e#'
'\x001\x07(\x12s\x1f:\x0e~\x1c,\x18s\x08"\x0c>\x1e#\x080\n9'
'\x08<\x05c', result)
second_part = 'It has two parts: a handshake and the data transfer.'
result = masker.mask(second_part)
self.assertEqual(
"('K%\x00 K9\x16<K=\x00!\x1f>[s\nm\t2\x05)\x12;\n&\x04s\n#"
"\x05s\x1f%\x04s\x0f,\x152K9\x132\x05>\x076\x19c", result)
def _receive_frame(self):
"""Receives a frame and return data in the frame as a tuple containing
each header field and payload separately.
Raises:
ConnectionTerminatedException: when read returns empty
string.
InvalidFrameException: when the frame contains invalid data.
"""
received = self.receive_bytes(2)
first_byte = ord(received[0])
fin = (first_byte >> 7) & 1
rsv1 = (first_byte >> 6) & 1
rsv2 = (first_byte >> 5) & 1
rsv3 = (first_byte >> 4) & 1
opcode = first_byte & 0xf
second_byte = ord(received[1])
mask = (second_byte >> 7) & 1
payload_length = second_byte & 0x7f
if (mask == 1) != self._options.unmask_receive:
raise InvalidFrameException(
'Mask bit on the received frame did\'nt match masking '
'configuration for received frames')
# The spec doesn't disallow putting a value in 0x0-0xFFFF into the
# 8-octet extended payload length field (or 0x0-0xFD in 2-octet field).
# So, we don't check the range of extended_payload_length.
if payload_length == 127:
extended_payload_length = self.receive_bytes(8)
payload_length = struct.unpack('!Q', extended_payload_length)[0]
if payload_length > 0x7FFFFFFFFFFFFFFF:
raise InvalidFrameException('Extended payload length >= 2^63')
elif payload_length == 126:
extended_payload_length = self.receive_bytes(2)
payload_length = struct.unpack('!H', extended_payload_length)[0]
if mask == 1:
masking_nonce = self.receive_bytes(4)
masker = util.RepeatedXorMasker(masking_nonce)
else:
masker = _NOOP_MASKER
bytes = masker.mask(self.receive_bytes(payload_length))
return opcode, bytes, fin, rsv1, rsv2, rsv3
def _build_frame(header, body, mask):
if not mask:
return header + body
# TODO: adapt original library code
# original code uses os.urandom which is not available on digi gateways
# get 4 bytes out of the int range 33..126 (readable ascii codes)
import random
random_int_list = random.sample(range(33, 127), 4)
masking_nonce = ''.join(chr(i) for i in random_int_list)
# was
# masking_nonce = os.urandom(4)
masker = util.RepeatedXorMasker(masking_nonce)
return header + masking_nonce + masker.mask(body)
def parse_frame(receive_bytes,
logger=None,
ws_version=common.VERSION_HYBI_LATEST,
unmask_receive=True):
"""Parses a frame. Returns a tuple containing each header field and
payload.
Args:
receive_bytes: a function that reads frame data from a stream or
something similar. The function takes length of the bytes to be
read. The function must raise ConnectionTerminatedException if
there is not enough data to be read.
logger: a logging object.
ws_version: the version of WebSocket protocol.
unmask_receive: unmask received frames. When received unmasked
frame, raises InvalidFrameException.
Raises:
ConnectionTerminatedException: when receive_bytes raises it.
InvalidFrameException: when the frame contains invalid data.
"""
if not logger:
logger = logging.getLogger()
logger.log(common.LOGLEVEL_FINE, 'Receive the first 2 octets of a frame')
first_byte = ord(receive_bytes(1))
fin = (first_byte >> 7) & 1
rsv1 = (first_byte >> 6) & 1
rsv2 = (first_byte >> 5) & 1
rsv3 = (first_byte >> 4) & 1
opcode = first_byte & 0xf
second_byte = ord(receive_bytes(1))
mask = (second_byte >> 7) & 1
payload_length = second_byte & 0x7f
logger.log(
common.LOGLEVEL_FINE, 'FIN=%s, RSV1=%s, RSV2=%s, RSV3=%s, opcode=%s, '
'Mask=%s, Payload_length=%s', fin, rsv1, rsv2, rsv3, opcode, mask,
payload_length)
if (mask == 1) != unmask_receive:
raise InvalidFrameException(
'Mask bit on the received frame did\'nt match masking '
'configuration for received frames')
# The HyBi and later specs disallow putting a value in 0x0-0xFFFF
# into the 8-octet extended payload length field (or 0x0-0xFD in
# 2-octet field).
valid_length_encoding = True
length_encoding_bytes = 1
if payload_length == 127:
logger.log(common.LOGLEVEL_FINE,
'Receive 8-octet extended payload length')
extended_payload_length = receive_bytes(8)
payload_length = struct.unpack('!Q', extended_payload_length)[0]
if payload_length > 0x7FFFFFFFFFFFFFFF:
raise InvalidFrameException('Extended payload length >= 2^63')
if ws_version >= 13 and payload_length < 0x10000:
valid_length_encoding = False
length_encoding_bytes = 8
logger.log(common.LOGLEVEL_FINE, 'Decoded_payload_length=%s',
payload_length)
elif payload_length == 126:
logger.log(common.LOGLEVEL_FINE,
'Receive 2-octet extended payload length')
extended_payload_length = receive_bytes(2)
payload_length = struct.unpack('!H', extended_payload_length)[0]
if ws_version >= 13 and payload_length < 126:
valid_length_encoding = False
length_encoding_bytes = 2
logger.log(common.LOGLEVEL_FINE, 'Decoded_payload_length=%s',
payload_length)
if not valid_length_encoding:
logger.warning(
'Payload length is not encoded using the minimal number of '
'bytes (%d is encoded using %d bytes)', payload_length,
length_encoding_bytes)
if mask == 1:
logger.log(common.LOGLEVEL_FINE, 'Receive mask')
masking_nonce = receive_bytes(4)
masker = util.RepeatedXorMasker(masking_nonce)
logger.log(common.LOGLEVEL_FINE, 'Mask=%r', masking_nonce)
else:
masker = _NOOP_MASKER
logger.log(common.LOGLEVEL_FINE, 'Receive payload data')
if logger.isEnabledFor(common.LOGLEVEL_FINE):
receive_start = time.time()
raw_payload_bytes = receive_bytes(payload_length)
if logger.isEnabledFor(common.LOGLEVEL_FINE):
logger.log(
common.LOGLEVEL_FINE, 'Done receiving payload data at %s MB/s',
payload_length / (time.time() - receive_start) / 1000 / 1000)
logger.log(common.LOGLEVEL_FINE, 'Unmask payload data')
if logger.isEnabledFor(common.LOGLEVEL_FINE):
unmask_start = time.time()
unmasked_bytes = masker.mask(raw_payload_bytes)
if logger.isEnabledFor(common.LOGLEVEL_FINE):
logger.log(common.LOGLEVEL_FINE,
'Done unmasking payload data at %s MB/s',
payload_length / (time.time() - unmask_start) / 1000 / 1000)
return opcode, unmasked_bytes, fin, rsv1, rsv2, rsv3
def _receive_frame(self):
"""Receives a frame and return data in the frame as a tuple containing
each header field and payload separately.
Raises:
ConnectionTerminatedException: when read returns empty
string.
InvalidFrameException: when the frame contains invalid data.
"""
received = self.receive_bytes(2)
first_byte = ord(received[0])
fin = (first_byte >> 7) & 1
rsv1 = (first_byte >> 6) & 1
rsv2 = (first_byte >> 5) & 1
rsv3 = (first_byte >> 4) & 1
opcode = first_byte & 0xf
second_byte = ord(received[1])
mask = (second_byte >> 7) & 1
payload_length = second_byte & 0x7f
if (mask == 1) != self._options.unmask_receive:
raise InvalidFrameException(
'Mask bit on the received frame did\'nt match masking '
'configuration for received frames')
# The Hybi-13 and later specs disallow putting a value in 0x0-0xFFFF
# into the 8-octet extended payload length field (or 0x0-0xFD in
# 2-octet field).
valid_length_encoding = True
length_encoding_bytes = 1
if payload_length == 127:
extended_payload_length = self.receive_bytes(8)
payload_length = struct.unpack('!Q', extended_payload_length)[0]
if payload_length > 0x7FFFFFFFFFFFFFFF:
raise InvalidFrameException('Extended payload length >= 2^63')
if self._request.ws_version >= 13 and payload_length < 0x10000:
valid_length_encoding = False
length_encoding_bytes = 8
elif payload_length == 126:
extended_payload_length = self.receive_bytes(2)
payload_length = struct.unpack('!H', extended_payload_length)[0]
if self._request.ws_version >= 13 and payload_length < 126:
valid_length_encoding = False
length_encoding_bytes = 2
if not valid_length_encoding:
self._logger.warning(
'Payload length is not encoded using the minimal number of '
'bytes (%d is encoded using %d bytes)', payload_length,
length_encoding_bytes)
if mask == 1:
masking_nonce = self.receive_bytes(4)
masker = util.RepeatedXorMasker(masking_nonce)
else:
masker = _NOOP_MASKER
bytes = masker.mask(self.receive_bytes(payload_length))
return opcode, bytes, fin, rsv1, rsv2, rsv3
def _receive_frame(self):
"""Receives a frame and return data in the frame as a tuple containing
each header field and payload separately.
Raises:
ConnectionTerminatedException: when read returns empty
string.
InvalidFrameException: when the frame contains invalid data.
"""
self._logger.log(common.LOGLEVEL_FINE,
'Receive the first 2 octets of a frame')
received = self.receive_bytes(2)
first_byte = ord(received[0])
fin = (first_byte >> 7) & 1
rsv1 = (first_byte >> 6) & 1
rsv2 = (first_byte >> 5) & 1
rsv3 = (first_byte >> 4) & 1
opcode = first_byte & 0xf
second_byte = ord(received[1])
mask = (second_byte >> 7) & 1
payload_length = second_byte & 0x7f
self._logger.log(
common.LOGLEVEL_FINE,
'FIN=%s, RSV1=%s, RSV2=%s, RSV3=%s, opcode=%s, '
'Mask=%s, Payload_length=%s', fin, rsv1, rsv2, rsv3, opcode, mask,
payload_length)
if (mask == 1) != self._options.unmask_receive:
raise InvalidFrameException(
'Mask bit on the received frame did\'nt match masking '
'configuration for received frames')
# The Hybi-13 and later specs disallow putting a value in 0x0-0xFFFF
# into the 8-octet extended payload length field (or 0x0-0xFD in
# 2-octet field).
valid_length_encoding = True
length_encoding_bytes = 1
if payload_length == 127:
self._logger.log(common.LOGLEVEL_FINE,
'Receive 8-octet extended payload length')
extended_payload_length = self.receive_bytes(8)
payload_length = struct.unpack('!Q', extended_payload_length)[0]
if payload_length > 0x7FFFFFFFFFFFFFFF:
raise InvalidFrameException('Extended payload length >= 2^63')
if self._request.ws_version >= 13 and payload_length < 0x10000:
valid_length_encoding = False
length_encoding_bytes = 8
self._logger.log(common.LOGLEVEL_FINE, 'Decoded_payload_length=%s',
payload_length)
elif payload_length == 126:
self._logger.log(common.LOGLEVEL_FINE,
'Receive 2-octet extended payload length')
extended_payload_length = self.receive_bytes(2)
payload_length = struct.unpack('!H', extended_payload_length)[0]
if self._request.ws_version >= 13 and payload_length < 126:
valid_length_encoding = False
length_encoding_bytes = 2
self._logger.log(common.LOGLEVEL_FINE, 'Decoded_payload_length=%s',
payload_length)
if not valid_length_encoding:
self._logger.warning(
'Payload length is not encoded using the minimal number of '
'bytes (%d is encoded using %d bytes)', payload_length,
length_encoding_bytes)
if mask == 1:
self._logger.log(common.LOGLEVEL_FINE, 'Receive mask')
masking_nonce = self.receive_bytes(4)
masker = util.RepeatedXorMasker(masking_nonce)
self._logger.log(common.LOGLEVEL_FINE, 'Mask=%r', masking_nonce)
else:
masker = _NOOP_MASKER
self._logger.log(common.LOGLEVEL_FINE, 'Receive payload data')
if self._logger.isEnabledFor(common.LOGLEVEL_FINE):
receive_start = time.time()
raw_payload_bytes = self.receive_bytes(payload_length)
if self._logger.isEnabledFor(common.LOGLEVEL_FINE):
self._logger.log(
common.LOGLEVEL_FINE, 'Done receiving payload data at %s MB/s',
payload_length / (time.time() - receive_start) / 1000 / 1000)
self._logger.log(common.LOGLEVEL_FINE, 'Unmask payload data')
if self._logger.isEnabledFor(common.LOGLEVEL_FINE):
unmask_start = time.time()
bytes = masker.mask(raw_payload_bytes)
if self._logger.isEnabledFor(common.LOGLEVEL_FINE):
self._logger.log(
common.LOGLEVEL_FINE, 'Done unmasking payload data at %s MB/s',
payload_length / (time.time() - unmask_start) / 1000 / 1000)
return opcode, bytes, fin, rsv1, rsv2, rsv3
