def send_packet(self, ident, data=""):
""" Sends a packet """
if self.closed:
return
self.log_packet("# send", ident)
# Prepend ident
data = Buffer.pack_varint(ident) + data
if self.compression_enabled:
# Compress data and prepend uncompressed data length
if len(data) >= self.compression_threshold:
data = Buffer.pack_varint(len(data)) + zlib.compress(data)
else:
data = Buffer.pack_varint(0) + data
# Prepend packet length
data = self.buff_type.pack_varint(len(data)) + data
# Encrypt
data = self.cipher.encrypt(data)
# Send
self.transport.write(data)
def send_packet(self, ident, data=""):
""" Sends a packet """
if self.closed:
return
self.log_packet("# send", ident)
# Prepend ident
data = Buffer.pack_varint(ident) + data
if self.compression_enabled:
# Compress data and prepend uncompressed data length
if len(data) >= self.compression_threshold:
data = Buffer.pack_varint(len(data)) + zlib.compress(data)
else:
data = Buffer.pack_varint(0) + data
# Prepend packet length
data = self.buff_type.pack_varint(len(data)) + data
# Encrypt
data = self.cipher.encrypt(data)
# Send
self.transport.write(data)
def data_received(self, data):
# Decrypt data
data = self.cipher.decrypt(data)
# Add it to our buffer
self.recv_buff.add(data)
# Read some packets
while not self.closed:
# Save the buffer, in case we read an incomplete packet
self.recv_buff.save()
# Try to read a packet
try:
packet_length = self.recv_buff.unpack_varint()
packet_body = self.recv_buff.unpack_raw(packet_length)
# Incomplete packet read, restore the buffer.
except BufferUnderrun:
self.recv_buff.restore()
break
# Load the packet body into a buffer
packet_buff = self.buff_type()
packet_buff.add(packet_body)
try: # Catch protocol errors
try: # Catch buffer overrun/underrun
if self.compression_enabled:
uncompressed_length = packet_buff.unpack_varint()
if uncompressed_length > 0:
data = zlib.decompress(packet_buff.unpack_all())
packet_buff = Buffer()
packet_buff.add(data)
ident = packet_buff.unpack_varint()
self.packet_received(packet_buff, ident)
except BufferUnderrun:
raise ProtocolError("Packet is too short!")
if packet_buff.length() > 0:
raise ProtocolError("Packet is too long!")
except ProtocolError as e:
self.protocol_error(e)
break
# We've read a complete packet, so reset the inactivity timeout
self.connection_timer.restart()
def data_received(self, data):
# Decrypt data
data = self.cipher.decrypt(data)
# Add it to our buffer
self.recv_buff.add(data)
# Read some packets
while not self.closed:
# Save the buffer, in case we read an incomplete packet
self.recv_buff.save()
# Try to read a packet
try:
packet_length = self.recv_buff.unpack_varint()
packet_body = self.recv_buff.unpack_raw(packet_length)
# Incomplete packet read, restore the buffer.
except BufferUnderrun:
self.recv_buff.restore()
break
# Load the packet body into a buffer
packet_buff = self.buff_type()
packet_buff.add(packet_body)
try: # Catch protocol errors
try: # Catch buffer overrun/underrun
if self.compression_enabled:
uncompressed_length = packet_buff.unpack_varint()
if uncompressed_length > 0:
data = zlib.decompress(packet_buff.unpack_all())
packet_buff = Buffer()
packet_buff.add(data)
ident = packet_buff.unpack_varint()
self.packet_received(packet_buff, ident)
except BufferUnderrun:
raise ProtocolError("Packet is too short!")
if packet_buff.length() > 0:
raise ProtocolError("Packet is too long!")
except ProtocolError as e:
self.protocol_error(e)
break
# We've read a complete packet, so reset the inactivity timeout
self.connection_timer.restart()
