World Packet
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World Packets are the majority of communication between the client and the world server.
World packets consist of a packet size, an Opcode and a body.
For server messages (SMSG) the headers look like:
| Offset | Size / Endianness | Type | Name | Description |
|---|---|---|---|---|
| 0x0 | 2 / Big | uint16 | size | Size of the packet including the opcode field. |
| 0x2 | 2 / Little | uint16 | opcode | Opcode for the packet. Determines the structure of the body. |
For client messages (CMSG) the headers look like:
| Offset | Size / Endianness | Type | Name | Description |
|---|---|---|---|---|
| 0x0 | 2 / Big | uint16 | size | Size of the packet including the opcode field. |
| 0x2 | 4 / Little | uint32 | opcode | Opcode for the packet. Determines the structure of the body. |
All world packet headers are encrypted using the session key negotiated during login, except for SMSG_AUTH_CHALLENGE and CMSG_AUTH_SESSION.