Difference between revisions of "RCON"
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(Distinction between JavaScript and TypeScript is irrelevant; the latter compiles to JavaScript and they all run on the same runtime, Node.JS (for JavaScript). TypeScript is in no way its own language and does not fundamentally differ from JavaScript) |
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| − | '''RCON''' is a protocol that allows server administrators to remotely execute {{Minecraft Wiki|Commands|Minecraft commands}}. Introduced in Beta 1.9-pre4, it's basically an implementation of the [http://developer.valvesoftware.com/wiki/Source_RCON_Protocol Source RCON protocol] for Minecraft. | + | '''RCON''' is a TCP/IP-based protocol that allows server administrators to remotely execute {{Minecraft Wiki|Commands|Minecraft commands}}. Introduced in Beta 1.9-pre4, it's basically an implementation of the [http://developer.valvesoftware.com/wiki/Source_RCON_Protocol Source RCON protocol] for Minecraft. |
== Server Config == | == Server Config == | ||
| Line 23: | Line 23: | ||
|- | |- | ||
| Length | | Length | ||
| − | | | + | | int32 |
| Length of ''remainder'' of packet | | Length of ''remainder'' of packet | ||
|- | |- | ||
| Request ID | | Request ID | ||
| − | | | + | | int32 |
| Client-generated ID | | Client-generated ID | ||
|- | |- | ||
| Type | | Type | ||
| − | | | + | | int32 |
| <code>3</code> for login, <code>2</code> to run a command, <code>0</code> for a multi-packet response | | <code>3</code> for login, <code>2</code> to run a command, <code>0</code> for a multi-packet response | ||
|- | |- | ||
| Line 44: | Line 44: | ||
Note on ASCII text: | Note on ASCII text: | ||
| − | Some servers reply with color codes prefixed by a section sign in their replies | + | Some servers reply with color codes prefixed by a section sign in their replies (for example Craftbukkit for Minecraft 1.4.7). |
| − | ( | ||
| − | The section sign is sent by those servers as byte 0xA7 or 167. | + | The section sign is sent by those servers as byte 0xA7 or 167. This is not part of the US-ASCII charset and will cause errors for clients that strictly use the US-ASCII charset. |
| − | This is not part of the US-ASCII charset and will cause errors | ||
| − | for clients that strictly use the US-ASCII charset. | ||
| − | Using the ISO-LATIN-1/ISO-8859_1 charset instead of the US-ASCII charset | + | Using the ISO-LATIN-1/ISO-8859_1 charset instead of the US-ASCII charset yields much better results for those servers. |
| − | yields much better results for those servers. | ||
| − | Alternatively | + | Alternatively removing byte 167 and one subsequent byte from the payload will remove all color tokens making the text more human readable for clients that do not subsequently colorize those tokens. |
| − | |||
== Packets == | == Packets == | ||
| Line 81: | Line 76: | ||
Maximum S->C packet payload length: 4096 (total: 4110) | Maximum S->C packet payload length: 4096 (total: 4110) | ||
| − | The | + | The Minecraft server can fragment responses across multiple packets. There's no simple way to know when the last response packet has been received; approaches include: |
# Wait until we receive a packet with a payload length < 4096 (not 100% reliable!) | # Wait until we receive a packet with a payload length < 4096 (not 100% reliable!) | ||
| Line 95: | Line 90: | ||
* C# | * C# | ||
** https://github.com/willroberts/minecraft-client-csharp (synchronous, GPL 3.0 license) | ** https://github.com/willroberts/minecraft-client-csharp (synchronous, GPL 3.0 license) | ||
| + | * Dart | ||
| + | ** https://github.com/aidanlok/mc_rcon (client, asynchronous, BSD 3-Clause license) | ||
* Go | * Go | ||
** https://github.com/micvbang/pocketmine-rcon (synchronous, MIT license) | ** https://github.com/micvbang/pocketmine-rcon (synchronous, MIT license) | ||
| Line 102: | Line 99: | ||
** https://github.com/jobfeikens/rcon (synchronous, GPL 3.0 license) | ** https://github.com/jobfeikens/rcon (synchronous, GPL 3.0 license) | ||
** https://github.com/CatCoderr/JRcon (asynchronous, AGPL-3.0 license) | ** https://github.com/CatCoderr/JRcon (asynchronous, AGPL-3.0 license) | ||
| − | * | + | * JavaScript |
| − | |||
** https://github.com/tehbeard/node-rcon (Node.js, asynchronous, no license) | ** https://github.com/tehbeard/node-rcon (Node.js, asynchronous, no license) | ||
| − | ** https://github.com/janispritzkau/rcon-client (Node.js | + | ** https://github.com/MinecraftJS/rcon (Node.js, asynchronous, MIT license) |
| + | ** https://github.com/EnriqCG/rcon-srcds (Node.js, asynchronous, MIT license) | ||
| + | ** https://github.com/willroberts/minecraft-client-ts (Node.js, asynchronous, GPL 3.0 license) | ||
| + | ** https://github.com/janispritzkau/rcon-client (Node.js, asynchronous, no license) | ||
* Kotlin | * Kotlin | ||
** https://github.com/willroberts/minecraft-client-kotlin (synchronous, GPL 3.0 license) | ** https://github.com/willroberts/minecraft-client-kotlin (synchronous, GPL 3.0 license) | ||
| Line 120: | Line 119: | ||
** https://github.com/A2PLab/minelib (connection-per-request, no license) | ** https://github.com/A2PLab/minelib (connection-per-request, no license) | ||
** https://github.com/willroberts/minecraft-client-scala (synchronous, GPL 3.0 license) | ** https://github.com/willroberts/minecraft-client-scala (synchronous, GPL 3.0 license) | ||
| − | |||
| − | |||
| − | |||
[[Category:Minecraft Modern]] | [[Category:Minecraft Modern]] | ||
Latest revision as of 01:08, 8 April 2024
RCON is a TCP/IP-based protocol that allows server administrators to remotely execute Minecraft commands. Introduced in Beta 1.9-pre4, it's basically an implementation of the Source RCON protocol for Minecraft.
Contents
Server Config
enable-rcon=true rcon.password=<your password> rcon.port=<1-65535> broadcast-rcon-to-ops=false
The default port is 25575.
Packet Format
Integers are little-endian, in contrast with the Minecraft protocol.
Responses are sent back with the same Request ID that you send. In the event of an auth failure (i.e. your login is incorrect, or you're trying to send commands without first logging in), request ID will be set to -1.
| Field name | Field type | Notes |
|---|---|---|
| Length | int32 | Length of remainder of packet |
| Request ID | int32 | Client-generated ID |
| Type | int32 | 3 for login, 2 to run a command, 0 for a multi-packet response
|
| Payload | byte[] | NULL-terminated ASCII text |
| 1-byte pad | byte | NULL |
Note on ASCII text: Some servers reply with color codes prefixed by a section sign in their replies (for example Craftbukkit for Minecraft 1.4.7).
The section sign is sent by those servers as byte 0xA7 or 167. This is not part of the US-ASCII charset and will cause errors for clients that strictly use the US-ASCII charset.
Using the ISO-LATIN-1/ISO-8859_1 charset instead of the US-ASCII charset yields much better results for those servers.
Alternatively removing byte 167 and one subsequent byte from the payload will remove all color tokens making the text more human readable for clients that do not subsequently colorize those tokens.
Packets
3: Login
Outgoing payload: password.
If the server returns a packet with the same request ID, auth was successful (note: packet type is 2, not 3). If you get a request ID of -1, auth failed (wrong password).
2: Command
Outgoing payload should be the command to run, e.g. time set 0
0: Command response
Incoming payload is the output of the command, though many commands return nothing, and there's no way of detecting unknown commands.
The output of the command may be split over multiple packets, each containing 4096 bytes (less for the last packet). Each packet contains part of the payload (and the two-byte padding). The last packet sent is the end of the output.
Fragmentation
Maximum C->S packet payload length: 1446 (total: 1460) - outdated?
Maximum S->C packet payload length: 4096 (total: 4110)
The Minecraft server can fragment responses across multiple packets. There's no simple way to know when the last response packet has been received; approaches include:
- Wait until we receive a packet with a payload length < 4096 (not 100% reliable!)
- Wait for n seconds
- Send two command packets; the second command triggers a response from the server with the same Request ID, and from this we know that we've already received the full response to the first command.
- The second packet should use a command that will not produce fragmented output
- An alternative is for the second C->S packet to use an invalid type (say, 100); the server will respond with a 'Command response' packet with its payload set to 'Unknown request c8'. (100 in hexadecimal)
Example implementations
- C
- https://github.com/tiiffi/mcrcon (synchronous, Zlib license)
- C#
- https://github.com/willroberts/minecraft-client-csharp (synchronous, GPL 3.0 license)
- Dart
- https://github.com/aidanlok/mc_rcon (client, asynchronous, BSD 3-Clause license)
- Go
- https://github.com/micvbang/pocketmine-rcon (synchronous, MIT license)
- https://github.com/willroberts/minecraft-client (asynchronous, GPL 3.0 license)
- https://godoc.org/github.com/Tnze/go-mc/net#RCONConn (client and server, synchronous, MIT license)
- Java
- https://github.com/jobfeikens/rcon (synchronous, GPL 3.0 license)
- https://github.com/CatCoderr/JRcon (asynchronous, AGPL-3.0 license)
- JavaScript
- https://github.com/tehbeard/node-rcon (Node.js, asynchronous, no license)
- https://github.com/MinecraftJS/rcon (Node.js, asynchronous, MIT license)
- https://github.com/EnriqCG/rcon-srcds (Node.js, asynchronous, MIT license)
- https://github.com/willroberts/minecraft-client-ts (Node.js, asynchronous, GPL 3.0 license)
- https://github.com/janispritzkau/rcon-client (Node.js, asynchronous, no license)
- Kotlin
- https://github.com/willroberts/minecraft-client-kotlin (synchronous, GPL 3.0 license)
- PHP
- https://gist.github.com/1292348 (synchronous, no license)
- Python 3
- https://github.com/Iapetus-11/aio-mc-rcon (asynchronous, MIT license)
- https://github.com/MrReacher/async-mcrcon (asynchronous, MIT license)
- https://github.com/barneygale/MCRcon (synchronous, MIT license)
- https://github.com/coNQP/mcipc (synchronous, GPL 3.0 license)
- Rust
- https://github.com/willroberts/minecraft-client-rs (synchronous, GPL 3.0 license)
- Scala
- https://github.com/A2PLab/minelib (connection-per-request, no license)
- https://github.com/willroberts/minecraft-client-scala (synchronous, GPL 3.0 license)
