Query
Query is a UDP protocol introduced in 1.9pre4 for the purpose of querying server properties. It looks a lot like the UT3 (or GameSpot) Query Protocol [1]
All data types are little-endian, with the exception of short
Contents
Server Config
enable-query=true #query.port=25565
Client to Server Packet Format
| Field name | Field Type | Notes |
|---|---|---|
| Magic | byte, byte | Always 0xFE 0xFD
|
| Type | byte | 9 to handshake, 0 to stat
|
| Session ID | int32 | |
| Payload | Varies | See below |
Server to Client Packet Format
| Field name | Field Type | Notes |
|---|---|---|
| Type | byte | 9 for handshake, 0 for stat
|
| Session ID | int32 | |
| Payload | Varies | See below |
Operations
Handshake
First, generate a session ID. It can be whatever you want.
Request
Send a request with an empty payload.
FE FD 09 00 00 00 01
Response
The response payload will be a session token (note: different to a session id) encoded as a null-terminated string. You should convert it to an int32 and store it.
09 00 00 00 01 39 35 31 33 33 30 37 00
9 5 1 3 3 0 7
Basic stat
Request
Your payload should be your session token, packed as an int32.
FE FD 00 00 00 00 01 00 3A 0D 5F
Response
Five null-terminated strings make up the beginning of the payload. They correspond to (motd, gametype, map, numplayers, maxplayers)
After these strings, a 2-byte, big-endian short, giving the hostport
At the end is a final null-terminated string, giving the hostname
00 00 00 00 01 41 20 4D 69 6E 65 63 72 61 66 74 | .....A Minecraft
20 53 65 72 76 65 72 00 53 4D 50 00 77 6F 72 6C | Server.SMP.worl
64 00 32 00 32 30 00 DD 63 31 32 37 2E 30 2E 30 | d.2.20.##127.0.0
2E 31 00 | .1.
Full stat
Request
The request is the same as in a basic stat, except the payload must be padded to 8 bytes. Sending 0x00 0x00 0x00 0x00 at the end works.
FE FD 00 00 00 00 01 00 3A 0D 5F 00 00 00 00
Response
The response is in two parts. You should split the response around the token \x00\x01player_\x00\x00.
The first part is a list of null-terminated strings, representing (key1, value1, key2, value2 ...)
The second part is another list of null-terminated strings, each representing a player.
At the very end there's a single null byte.
00 00 00 00 01 73 70 6C 69 74 6E 75 6D 00 80 00 | .....splitnum...
68 6F 73 74 6E 61 6D 65 00 41 20 4D 69 6E 65 63 | hostname.A minec
72 61 66 74 20 53 65 72 76 65 72 00 67 61 6D 65 | raft Server.game
74 79 70 65 00 53 4D 50 00 67 61 6D 65 5F 69 64 | type.SMP.game_id
00 4D 49 4E 45 43 52 41 46 54 00 76 65 72 73 69 | .MINECRAFT.versi
6F 6E 00 42 65 74 61 20 31 2E 39 20 50 72 65 72 | on.Beta 1.9 Prer
65 6C 65 61 73 65 20 34 00 70 6C 75 67 69 6E 73 | elease 4.plugins
00 00 6D 61 70 00 77 6F 72 6C 64 00 6E 75 6D 70 | ..map.world.nump
6C 61 79 65 72 73 00 32 00 6D 61 78 70 6C 61 79 | layers.2.maxplay
65 72 73 00 32 30 00 68 6F 73 74 70 6F 72 74 00 | ers.20.hostport.
32 35 35 36 35 00 68 6F 73 74 6E 61 6D 65 00 31 | 25565.hostname.1
32 37 2E 30 2E 30 2E 31 00 00 01 70 6C 61 79 65 | 27.0.0.1...playe
72 5F 00 00 62 61 72 6E 65 79 67 61 6C 65 00 56 | r_..barneygale.V
69 76 61 6C 61 68 65 6C 76 69 67 00 00 | ivalahelvig..
