2020-04-04 16:04:40 +02:00
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# General packet
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## Client to server spesific
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* Encode (encrypt) data
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* use first byte as checksum
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* every byte ^ 0xAA added together
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* xor
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* Server port ^ 0xCCCC
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* Every other byte
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* Lookup table (use byte as indexing value)
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## Shared
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* Can be internal packet
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2020-04-04 23:12:24 +02:00
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* If packet is smaller then 3 bytes; forward to plugin handlers (*)before handling them (len(data) <= 2)
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## Order of operations
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1. Check if banned (if true, cancel rest and handle) [^1]
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2. If first byte in data is (0x19, 0x1d, 0x1f, 0x24 or 0x18) custom code flow required [^2]
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3. HandleSocketReceiveFromConnectedPlayer (cancel rest if handled)
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4. Check if cheat (modified) packet (unexpected at this time, there are some packets we can expect) [^3]
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[^1]: this could be changed in custom implementation (dont allow inital connection instead)
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[^2]: if (0x18 and length == 2) or (0x19 and length <= 2):
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handle packet and return
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elif (0x1d or 0x1f or 0x24) and length <= 2:
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handle packet, but continue
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[^3]: if ((0x18 or 0x1a) and length <= 3) or ((0x19 or 0x1d) and length <= 2) or
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((0x08 or 0x07 or 0x27) and length >= 5) or (0x37 and length < 400):
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We expect this packet, everything is ok?
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else:
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This is a cheat (modified / injected) packet that should not arrive at this time
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Send a packet to client that you received a modified packet (0x26)
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2020-04-04 16:04:40 +02:00
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# Internal packet
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|condition|name|bit length|type|notes|
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|---|---|---|---|---|
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||messageNumber|0x10|ushort||
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||reliability|0x04|uchar|Has to be over 5 (value > 5)|
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|reliability in (7, 10, 9)|orderingChannel|0x05|||
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|reliability in (7, 10, 9)|orderingIndex|0x10|ushort||
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||isSplitPacket|0x01|bool|Drop packet as we no longer support split packet?|
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|isSplitPacket == 0|dataBitLength|0x10|ushort||
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|isSplitPacket == 0|data|dataBitLength|uchar*||
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