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47 lines
1.3 KiB
Python
47 lines
1.3 KiB
Python
import struct
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import random
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import os
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from .connection import Connection, PacketCodec
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class IntermediatePacketCodec(PacketCodec):
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tag = b'\xee\xee\xee\xee'
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obfuscate_tag = tag
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def encode_packet(self, data):
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return struct.pack('<i', len(data)) + data
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async def read_packet(self, reader):
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length = struct.unpack('<i', await reader.readexactly(4))[0]
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return await reader.readexactly(length)
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class RandomizedIntermediatePacketCodec(IntermediatePacketCodec):
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"""
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Data packets are aligned to 4bytes. This codec adds random bytes of size
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from 0 to 3 bytes, which are ignored by decoder.
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"""
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tag = None
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obfuscate_tag = b'\xdd\xdd\xdd\xdd'
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def encode_packet(self, data):
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pad_size = random.randint(0, 3)
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padding = os.urandom(pad_size)
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return super().encode_packet(data + padding)
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async def read_packet(self, reader):
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packet_with_padding = await super().read_packet(reader)
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pad_size = len(packet_with_padding) % 4
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if pad_size > 0:
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return packet_with_padding[:-pad_size]
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return packet_with_padding
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class ConnectionTcpIntermediate(Connection):
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"""
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Intermediate mode between `ConnectionTcpFull` and `ConnectionTcpAbridged`.
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Always sends 4 extra bytes for the packet length.
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"""
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packet_codec = IntermediatePacketCodec
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