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