Difference between revisions of "Raknet Protocol"
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[http://www.jenkinssoftware.com/ RakNet] is a networking library used by Minecraft Bedrock Edition. You might want to also look at the documentation for the [[Bedrock Protocol]]. | [http://www.jenkinssoftware.com/ RakNet] is a networking library used by Minecraft Bedrock Edition. You might want to also look at the documentation for the [[Bedrock Protocol]]. | ||
− | |||
This is based on the old [https://wiki.vg/Pocket_Edition_Protocol_Documentation#RakNet_protocol Pocket Edition Protocol Documentation] and may be incomplete or outdated. | This is based on the old [https://wiki.vg/Pocket_Edition_Protocol_Documentation#RakNet_protocol Pocket Edition Protocol Documentation] and may be incomplete or outdated. | ||
+ | The source code for the RakNet Library can be found [https://github.com/OculusVR/RakNet/ here]. | ||
+ | RakNet uses [https://en.wikipedia.org/wiki/User_Datagram_Protocol UDP] as its networking protocol. The key differences from TCP are that not all packets are guaranteed to reach the destination at all or in order (it isn't reliable) and it uses messages with a specified length instead of streams of data. RakNet compensates for the out-of-order delivery and makes it reliable. | ||
− | |||
+ | '''NOTE:''' | ||
You may want to use an existing library if one exists for your language of choice. | You may want to use an existing library if one exists for your language of choice. | ||
− | Here is an incomplete list. Not all of these are maintained or complete. If these are outdated you may need to change the protocol version to | + | Here is an incomplete list. Not all of these are maintained or complete. If these are outdated you may need to change the protocol version to 11 before it can work. The protocol doesn't seem to have had any significant changes since the official implementation was discontinued in 2014, so as long as you bump the protocol version older libraries are likely to still work. |
− | {| class="wikitable sortable" style="width: auto; text-align: center;" | + | {| class="wikitable sortable" style="width: auto; text-align: center;"[[Category:Bedrock Minecraft]] |
|-style="background:#eee" | |-style="background:#eee" | ||
! Name | ! Name | ||
Line 18: | Line 16: | ||
! License | ! License | ||
! Active development | ! Active development | ||
+ | |- | ||
+ | ! [https://github.com/sandertv/go-raknet go-raknet] | ||
+ | | Network System used for [https://github.com/df-mc/dragonfly Dragonfly] written in Go | ||
+ | | Golang | ||
+ | | GPL-3 | ||
+ | | Yes | ||
+ | |- | ||
+ | ! [https://github.com/netrexmc/raknet RakNet] | ||
+ | | RakNet implementation written in Rust | ||
+ | | Rust | ||
+ | | GPL-3 | ||
+ | | Yes | ||
+ | |- | ||
+ | ! [https://github.com/PieMC-Dev/PieRakNet PieRakNet] | ||
+ | | Network System used for [https://github.com/PieMC-Dev/PieMC PieMC] written in Python | ||
+ | | Python | ||
+ | | GPL-3 | ||
+ | | Yes | ||
|- | |- | ||
! [https://github.com/NukkitX/Network NukkitX Network] | ! [https://github.com/NukkitX/Network NukkitX Network] | ||
− | | Network components used within NukkitX | + | | Network components used within NukkitX, but with great support for general use as well |
| Java | | Java | ||
| Apache License | | Apache License | ||
+ | | Yes | ||
+ | |- | ||
+ | ! [https://github.com/Podrum/rak_net rak-net] | ||
+ | | rak-net is the first updated and fully working RakNet implementation written in Python to run a Minecraft Bedrock Edition server. This library was mainly created for Podrum, although it can be used in other projects too and can be installed via pip. | ||
+ | | Python | ||
+ | | MIT | ||
| Yes | | Yes | ||
|- | |- | ||
Line 28: | Line 50: | ||
| JRakNet is a networking library for Java which implements the UDP based protocol RakNet | | JRakNet is a networking library for Java which implements the UDP based protocol RakNet | ||
| Java | | Java | ||
+ | | MIT | ||
+ | | Yes | ||
+ | |- | ||
+ | ! [https://github.com/yesdog/netty-raknet netty-raknet] | ||
+ | | High performance implementation of RakNet for netty, following strict netty patterns. | ||
+ | | Java | ||
+ | | MIT | ||
+ | | Yes | ||
+ | |- | ||
+ | ! [https://github.com/HerryYT/JSRakNet JSRakNet] | ||
+ | | JSRakNet is the first up to date and fully working raknet implementation written in Javascript to run a Minecraft PE server, designed mainly for JSPrismarine, but the implementation offers a general use | ||
+ | | Javascript | ||
| MIT | | MIT | ||
| Yes | | Yes | ||
Line 36: | Line 70: | ||
| LGPL | | LGPL | ||
| No | | No | ||
+ | |- | ||
+ | ! [https://github.com/pmmp/RakLib RakLib] | ||
+ | | RakNet server implementation written in PHP. This library is very lightweight on actual implementation - it provides the bare minimum to get a Minecraft Pocket Edition server functional. It only currently provides server functionality, and does not support most RakNet features. | ||
+ | | PHP | ||
+ | | GPL | ||
+ | | Yes | ||
|- | |- | ||
! [https://www.npmjs.com/package/raknet/ raknet] | ! [https://www.npmjs.com/package/raknet/ raknet] | ||
| UDP network library that follows the RakNet protocol for Node.js | | UDP network library that follows the RakNet protocol for Node.js | ||
− | | | + | | Javascript |
| MIT | | MIT | ||
| No | | No | ||
|- | |- | ||
! [https://pypi.org/project/PyRakLib/ PyRakLib] | ! [https://pypi.org/project/PyRakLib/ PyRakLib] | ||
− | | PyRakLib is a networking library that follows the RakNet protocol for MCPE. It is ported from the PHP library | + | | PyRakLib is a networking library that follows the RakNet protocol for MCPE. It is ported from the PHP library RakLib. |
| Python | | Python | ||
| GPL | | GPL | ||
| No | | No | ||
+ | |- | ||
+ | ! [https://github.com/b23r0/rust-raknet rust-raknet] | ||
+ | | RakNet Protocol implementation by Rust. | ||
+ | | Rust | ||
+ | | MIT | ||
+ | | Yes | ||
+ | |- | ||
+ | |- | ||
+ | ! [https://github.com/JoseLuisHD/RakNet RakNet] | ||
+ | | Simplified RakNet Implementation in C# for game networking | ||
+ | | C# | ||
+ | | MIT | ||
+ | | Yes | ||
|- | |- | ||
! [https://github.com/facebookarchive/RakNet Raknet] (official) | ! [https://github.com/facebookarchive/RakNet Raknet] (official) | ||
Line 65: | Line 118: | ||
! Notes | ! Notes | ||
|- | |- | ||
− | ! | + | ! byte |
| 1 | | 1 | ||
| 0 to 255 | | 0 to 255 | ||
Line 94: | Line 147: | ||
| N/A | | N/A | ||
| class="col3" | Prefixed by a short containing the length of the string in characters. It appears that only the following ASCII characters can be displayed: !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~ | | class="col3" | Prefixed by a short containing the length of the string in characters. It appears that only the following ASCII characters can be displayed: !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~ | ||
+ | |- | ||
+ | ! boolean | ||
+ | | 1 | ||
+ | | 0 to 1 | ||
+ | | True is encoded as <code>0x01</code>, false as <code>0x00</code>. | ||
+ | |- | ||
+ | ! address | ||
+ | | 7 or 29 | ||
+ | | | ||
+ | | 1 byte for the IP version (4 or 6), followed by (for IPv4) 4 bytes for the IP and an unsigned short for the port number or (for IPv6) an unsigned short for the address family, an unsigned short for the port, 4 bytes for the flow info, 16 bytes for address and 4 bytes for scope id | ||
+ | |- | ||
+ | ! uint24le | ||
+ | | 3 | ||
+ | | | ||
+ | | 3-byte little-endian unsigned integer | ||
+ | |- | ||
+ | ! Int | ||
+ | | 4 | ||
+ | | -2147483648 to 2147483647 | ||
+ | | Signed little-endian 32-bit Integer | ||
|} | |} | ||
+ | |||
+ | == Handshake sequence == | ||
+ | |||
+ | # C→S: [[#Open Connection Request 1|Open Connection Request 1]] | ||
+ | # S→C: [[#Open Connection Reply 1|Open Connection Reply 1]] | ||
+ | # C→S: [[#Open Connection Request 2|Open Connection Request 2]] | ||
+ | # S→C: [[#Open Connection Reply 2|Open Connection Reply 2]] | ||
+ | |||
+ | From here on, the RakNet connection is established and all RakNet messages are contained in a [[#Frame Set Packet|Frame Set Packet]]. | ||
+ | |||
+ | # C→S: [[#Connection Request|Connection Request]] | ||
+ | # S→C: [[#Connection Request Accepted|Connection Request Accepted]] | ||
+ | # C→S: [[#New Incoming Connection|New Incoming Connection]] | ||
+ | |||
+ | Next packets should be [[#Game Packet|Game Packet]] | ||
== Packets == | == Packets == | ||
Line 119: | Line 207: | ||
|} | |} | ||
+ | This is the first RakNet message sent by the client to a RakNet server. <code>0x01</code> is sent almost every second if the client is on the server list menu and every 4-5 seconds if the client is in-game. | ||
<code>0x02</code> is only replied to if there are open connections to the server. '''Note:''' as of 0.15.6 it seems that the game refreshes it's LAN world list every 4-5 seconds, however it seems the game will still ping in 1 second intervals.<br> | <code>0x02</code> is only replied to if there are open connections to the server. '''Note:''' as of 0.15.6 it seems that the game refreshes it's LAN world list every 4-5 seconds, however it seems the game will still ping in 1 second intervals.<br> | ||
This packet should be responded to with unconnected Pong. | This packet should be responded to with unconnected Pong. | ||
Line 146: | Line 235: | ||
| Used for the MOTD. See below for details. | | Used for the MOTD. See below for details. | ||
|} | |} | ||
+ | |||
+ | Unconnected Pong message is sent by the server to the client in response to the Unconnected Ping message. It contains various data that is sent to the client such as MOTD, number of players, max player count, etc. The format is given below: | ||
'''Server ID string format''' | '''Server ID string format''' | ||
For Minecraft Bedrock this is separated by semicolons and uses the following format:<br> | For Minecraft Bedrock this is separated by semicolons and uses the following format:<br> | ||
− | <code>Edition (MCPE or MCEE for Education Edition);MOTD line 1;Protocol Version;Version Name;Player Count;Max Player Count;Server Unique ID;MOTD line 2; | + | <code>Edition (MCPE or MCEE for Education Edition);MOTD line 1;Protocol Version;Version Name;Player Count;Max Player Count;Server Unique ID;MOTD line 2;Game mode;Game mode (numeric);Port (IPv4);Port (IPv6);</code><br> |
Example:<br> | Example:<br> | ||
<code>MCPE;Dedicated Server;390;1.14.60;0;10;13253860892328930865;Bedrock level;Survival;1;19132;19133;</code><br> | <code>MCPE;Dedicated Server;390;1.14.60;0;10;13253860892328930865;Bedrock level;Survival;1;19132;19133;</code><br> | ||
Result:<br> | Result:<br> | ||
− | [[File:Server_ID_String_Example.png]] | + | [[File:Server_ID_String_Example.png]]<br> |
+ | The Game mode and Game mode (numeric) values seem to not be used by the client. | ||
=== Connected Ping === | === Connected Ping === | ||
Line 169: | Line 261: | ||
| | | | ||
|} | |} | ||
+ | |||
+ | This is the first packet sent in the Encapsulated Frame Set Packet by the client to the server. It is sent with the reliability type Unreliable so it can be handled immediately by the server. | ||
+ | It is used for calculating the average ping between the client and the server. | ||
=== Connected Pong === | === Connected Pong === | ||
Line 187: | Line 282: | ||
|} | |} | ||
− | === | + | Connected Pong message is sent in response to the Connected Ping message with reliability type set to Unreliable so it can be handled immediately by the client. |
+ | |||
+ | === Open Connection Request 1 === | ||
{| class="wikitable" | {| class="wikitable" | ||
! Packet ID | ! Packet ID | ||
Line 201: | Line 298: | ||
| Protocol version | | Protocol version | ||
| byte | | byte | ||
− | | Currently | + | | Currently 11 |
|- | |- | ||
| MTU | | MTU | ||
− | | | + | | Zero padding |
− | | The MTU sent in the response appears to be somewhere around the size of this padding + 46 (28 udp overhead, 1 packet id, 16 magic, 1 protocol version) | + | | The MTU sent in the response appears to be somewhere around the size of this padding + 46 (28 udp overhead, 1 packet id, 16 magic, 1 protocol version). This padding seems to be used to discover the maximum packet size the network can handle. |
|} | |} | ||
− | The client sends these to the target server with ever decreasing MTU until the server responds. This is used to discover the MTU size for the connection. If the RakNet protocol does not match your own, respond with the Incompatible protocol packet | + | The client sends these to the target server with ever decreasing MTU until the server responds. This is used to discover the MTU size for the connection. According to the official docs, "The MTU size is the maximum size of a packet RakNet will generate", and "if you set the MTU size larger than your or any router along the network path takes, then the network will split the packet at best, or drop it at worst", so this process of sending decreasingly padded packets (compensating for the size of the packet itself and UDP overhead, which together make 46 bytes) seem to be used to discover the maximum packet size the network can handle. See the [http://www.jenkinssoftware.com/raknet/manual/programmingtips.html official documentation page] for more info about the MTU size. If the RakNet protocol does not match your own, respond with the Incompatible protocol packet.<br><br> |
+ | You should always respond to the first of these packets that you receive with Open Connection Reply 1, containing an MTU size of the amount of padding you received in bytes plus 46. | ||
− | === | + | === Open Connection Reply 1 === |
{| class="wikitable" | {| class="wikitable" | ||
! Packet ID | ! Packet ID | ||
Line 217: | Line 315: | ||
! Notes | ! Notes | ||
|- | |- | ||
− | |rowspan=" | + | |rowspan="5"| 0x06 |
| Magic | | Magic | ||
| MAGIC | | MAGIC | ||
Line 226: | Line 324: | ||
| | | | ||
|- | |- | ||
− | | Use security | + | | Use security? |
| boolean | | boolean | ||
− | | | + | | If true, a cookie can be specified after to prevent source IP spoofing |
− | | | + | |- |
+ | | Cookie | ||
+ | | Int | ||
+ | | Only if use security; a cookie to be sent back by the client in Open Connection Request 2 | ||
|- | |- | ||
| MTU | | MTU | ||
| short | | short | ||
− | | see | + | | see Open Connection Request 1 |
|} | |} | ||
− | === | + | === Open Connection Request 2 === |
{| class="wikitable" | {| class="wikitable" | ||
! Packet ID | ! Packet ID | ||
Line 243: | Line 344: | ||
! Notes | ! Notes | ||
|- | |- | ||
− | |rowspan=" | + | |rowspan="6"| 0x07 |
| Magic | | Magic | ||
| MAGIC | | MAGIC | ||
Line 251: | Line 352: | ||
| address | | address | ||
| | | | ||
+ | |- | ||
+ | | Cookie | ||
+ | | Int | ||
+ | | Only present if a cookie was provided by the server in Open Connection Reply 1 | ||
+ | |- | ||
+ | | Client supports security | ||
+ | | boolean | ||
+ | | Only present if a cookie was provided by the server in Open Connection Reply 1 and always false for the vanilla client | ||
|- | |- | ||
| MTU | | MTU | ||
Line 261: | Line 370: | ||
|} | |} | ||
− | === | + | === Open Connection Reply 2 === |
{| class="wikitable" | {| class="wikitable" | ||
! Packet ID | ! Packet ID | ||
Line 286: | Line 395: | ||
|- | |- | ||
| Encryption enabled? | | Encryption enabled? | ||
− | | | + | | boolean |
− | | | + | | |
|} | |} | ||
− | === | + | === Connection Request === |
{| class="wikitable" | {| class="wikitable" | ||
! Packet ID | ! Packet ID | ||
Line 297: | Line 406: | ||
! Notes | ! Notes | ||
|- | |- | ||
− | |rowspan=" | + | |rowspan="3"| 0x09 |
| GUID | | GUID | ||
| Long | | Long | ||
Line 304: | Line 413: | ||
| Time | | Time | ||
| Long | | Long | ||
+ | | | ||
+ | |- | ||
+ | | Use security? | ||
+ | | boolean | ||
| | | | ||
|} | |} | ||
− | === | + | === Connection Request Accepted === |
{| class="wikitable" | {| class="wikitable" | ||
! Packet ID | ! Packet ID | ||
Line 336: | Line 449: | ||
|} | |} | ||
− | === Incompatible | + | === New Incoming Connection === |
+ | {| class="wikitable" | ||
+ | ! Packet ID | ||
+ | ! Field Name | ||
+ | ! Field Type | ||
+ | ! Notes | ||
+ | |- | ||
+ | |rowspan="4"| 0x13 | ||
+ | | Server address | ||
+ | | address | ||
+ | | | ||
+ | |- | ||
+ | | Internal address | ||
+ | | 20x address | ||
+ | | Unknown what this is used for. | ||
+ | |- | ||
+ | |- | ||
+ | | Incoming Timestamp | ||
+ | | Long | ||
+ | | | ||
+ | |- | ||
+ | |- | ||
+ | | Server Timestamp | ||
+ | | Long | ||
+ | | | ||
+ | |- | ||
+ | |} | ||
+ | |||
+ | === Disconnect === | ||
+ | {| class="wikitable" | ||
+ | ! Packet ID | ||
+ | |- | ||
+ | |0x15 | ||
+ | |- | ||
+ | |} | ||
+ | |||
+ | === Incompatible Protocol === | ||
{| class="wikitable" | {| class="wikitable" | ||
! Packet ID | ! Packet ID | ||
Line 343: | Line 492: | ||
! Notes | ! Notes | ||
|- | |- | ||
− | |rowspan=" | + | |rowspan="3"| 0x19 |
| Protocol | | Protocol | ||
| byte | | byte | ||
Line 383: | Line 532: | ||
|- | |- | ||
|rowspan="11"| 0x80..0x8d | |rowspan="11"| 0x80..0x8d | ||
− | |colspan="3"| | + | |colspan="3"| Sequence number |
| uint24le | | uint24le | ||
| | | | ||
Line 393: | Line 542: | ||
|- | |- | ||
|colspan="2"| Length IN BITS | |colspan="2"| Length IN BITS | ||
− | | short | + | | unsigned short |
| Length of the body in bits. | | Length of the body in bits. | ||
|- | |- | ||
Line 494: | Line 643: | ||
! Notes | ! Notes | ||
|- | |- | ||
− | | | + | | 0xfe |
| Body | | Body | ||
| bytes | | bytes | ||
− | | Single packet of the GAME protocol. | + | | Single packet of the GAME protocol. The packet is usually compressed. |
|} | |} | ||
Line 507: | Line 656: | ||
! style="font-weight: bold;" | Notes | ! style="font-weight: bold;" | Notes | ||
|- | |- | ||
− | | 0xa0 | + | | rowspan="5" | 0xa0 |
| colspan="3" | Record count | | colspan="3" | Record count | ||
| short | | short | ||
| | | | ||
|- | |- | ||
− | |||
| rowspan="4" | Record | | rowspan="4" | Record | ||
− | | colspan="2" | | + | | colspan="2" | Single Sequence number? |
− | | | + | | boolean |
− | | | + | | False for range, True for no range |
|- | |- | ||
− | |||
| No Range | | No Range | ||
− | | | + | | Sequence number |
| uint24le | | uint24le | ||
− | | | + | | rowspan="3" | Number of sequence to not acknowledge |
|- | |- | ||
− | |||
| rowspan="2" | Range | | rowspan="2" | Range | ||
− | | Start | + | | Start Sequence number |
| uint24le | | uint24le | ||
− | |||
|- | |- | ||
− | + | | End Sequence number | |
− | | End | ||
| uint24le | | uint24le | ||
− | |||
|} | |} | ||
Line 543: | Line 686: | ||
! style="font-weight: bold;" | Notes | ! style="font-weight: bold;" | Notes | ||
|- | |- | ||
− | | 0xc0 | + | | rowspan="5" | 0xc0 |
| colspan="3" | Record count | | colspan="3" | Record count | ||
| short | | short | ||
| | | | ||
|- | |- | ||
− | |||
| rowspan="4" | Record | | rowspan="4" | Record | ||
− | | colspan="2" | | + | | colspan="2" | Single Sequence number? |
− | | | + | | boolean |
− | | | + | | False for range, True for no range |
|- | |- | ||
− | |||
| No Range | | No Range | ||
− | | | + | | Sequence number |
| uint24le | | uint24le | ||
− | | | + | | rowspan="3" | Number of sequence to acknowledge |
|- | |- | ||
− | |||
| rowspan="2" | Range | | rowspan="2" | Range | ||
− | | Start | + | | Start Sequence number |
| uint24le | | uint24le | ||
− | |||
|- | |- | ||
− | + | | End Sequence number | |
− | | End | ||
| uint24le | | uint24le | ||
− | |||
|} | |} | ||
+ | |||
+ | [[Category:Bedrock Minecraft]] |
Latest revision as of 07:59, 27 October 2024
RakNet is a networking library used by Minecraft Bedrock Edition. You might want to also look at the documentation for the Bedrock Protocol. This is based on the old Pocket Edition Protocol Documentation and may be incomplete or outdated. The source code for the RakNet Library can be found here. RakNet uses UDP as its networking protocol. The key differences from TCP are that not all packets are guaranteed to reach the destination at all or in order (it isn't reliable) and it uses messages with a specified length instead of streams of data. RakNet compensates for the out-of-order delivery and makes it reliable.
NOTE:
You may want to use an existing library if one exists for your language of choice.
Here is an incomplete list. Not all of these are maintained or complete. If these are outdated you may need to change the protocol version to 11 before it can work. The protocol doesn't seem to have had any significant changes since the official implementation was discontinued in 2014, so as long as you bump the protocol version older libraries are likely to still work.
Name | Description | Language | License | Active development |
---|---|---|---|---|
go-raknet | Network System used for Dragonfly written in Go | Golang | GPL-3 | Yes |
RakNet | RakNet implementation written in Rust | Rust | GPL-3 | Yes |
PieRakNet | Network System used for PieMC written in Python | Python | GPL-3 | Yes |
NukkitX Network | Network components used within NukkitX, but with great support for general use as well | Java | Apache License | Yes |
rak-net | rak-net is the first updated and fully working RakNet implementation written in Python to run a Minecraft Bedrock Edition server. This library was mainly created for Podrum, although it can be used in other projects too and can be installed via pip. | Python | MIT | Yes |
JRakNet | JRakNet is a networking library for Java which implements the UDP based protocol RakNet | Java | MIT | Yes |
netty-raknet | High performance implementation of RakNet for netty, following strict netty patterns. | Java | MIT | Yes |
JSRakNet | JSRakNet is the first up to date and fully working raknet implementation written in Javascript to run a Minecraft PE server, designed mainly for JSPrismarine, but the implementation offers a general use | Javascript | MIT | Yes |
JRakLibPlus | A library for easy creation of RakNet servers, based on RakLib and JRakLib. | Java | LGPL | No |
RakLib | RakNet server implementation written in PHP. This library is very lightweight on actual implementation - it provides the bare minimum to get a Minecraft Pocket Edition server functional. It only currently provides server functionality, and does not support most RakNet features. | PHP | GPL | Yes |
raknet | UDP network library that follows the RakNet protocol for Node.js | Javascript | MIT | No |
PyRakLib | PyRakLib is a networking library that follows the RakNet protocol for MCPE. It is ported from the PHP library RakLib. | Python | GPL | No |
rust-raknet | RakNet Protocol implementation by Rust. | Rust | MIT | Yes |
RakNet | Simplified RakNet Implementation in C# for game networking | C# | MIT | Yes |
Raknet (official) | The official implementation. Outdated and mostly for reference purposes. May not work with the latest Bedrock. | C++ | BSD | No |
Contents
- 1 Data types
- 2 Handshake sequence
- 3 Packets
- 3.1 Unconnected Ping
- 3.2 Unconnected Pong
- 3.3 Connected Ping
- 3.4 Connected Pong
- 3.5 Open Connection Request 1
- 3.6 Open Connection Reply 1
- 3.7 Open Connection Request 2
- 3.8 Open Connection Reply 2
- 3.9 Connection Request
- 3.10 Connection Request Accepted
- 3.11 New Incoming Connection
- 3.12 Disconnect
- 3.13 Incompatible Protocol
- 3.14 Unconnected Ping
- 3.15 Frame Set Packet
- 3.16 Game Packet
- 3.17 NACK
- 3.18 ACK
Data types
Size (Bytes) | Range | Notes | |
---|---|---|---|
byte | 1 | 0 to 255 | |
Long | 8 | -2^63 to 2^63-1 | Signed 64-bit Integer |
Magic | 16 | 00ffff00fefefefefdfdfdfd12345678
|
Always those hex bytes, corresponding to RakNet's default OFFLINE_MESSAGE_DATA_ID |
short | 2 | -32768 to 32767 | |
unsigned short | 2 | 0 to 65535 | |
string | unsigned short + string | N/A | Prefixed by a short containing the length of the string in characters. It appears that only the following ASCII characters can be displayed: !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~ |
boolean | 1 | 0 to 1 | True is encoded as 0x01 , false as 0x00 .
|
address | 7 or 29 | 1 byte for the IP version (4 or 6), followed by (for IPv4) 4 bytes for the IP and an unsigned short for the port number or (for IPv6) an unsigned short for the address family, an unsigned short for the port, 4 bytes for the flow info, 16 bytes for address and 4 bytes for scope id | |
uint24le | 3 | 3-byte little-endian unsigned integer | |
Int | 4 | -2147483648 to 2147483647 | Signed little-endian 32-bit Integer |
Handshake sequence
- C→S: Open Connection Request 1
- S→C: Open Connection Reply 1
- C→S: Open Connection Request 2
- S→C: Open Connection Reply 2
From here on, the RakNet connection is established and all RakNet messages are contained in a Frame Set Packet.
- C→S: Connection Request
- S→C: Connection Request Accepted
- C→S: New Incoming Connection
Next packets should be Game Packet
Packets
Unconnected Ping
Packet ID | Field Name | Field Type | Notes |
---|---|---|---|
0x01, 0x02 | Time | Long | |
MAGIC | magic | ||
Client GUID | Long |
This is the first RakNet message sent by the client to a RakNet server. 0x01
is sent almost every second if the client is on the server list menu and every 4-5 seconds if the client is in-game.
0x02
is only replied to if there are open connections to the server. Note: as of 0.15.6 it seems that the game refreshes it's LAN world list every 4-5 seconds, however it seems the game will still ping in 1 second intervals.
This packet should be responded to with unconnected Pong.
Unconnected Pong
Packet ID | Field Name | Field Type | Notes |
---|---|---|---|
0x1c | Time | Long | |
Server GUID | Long | ||
MAGIC | magic | ||
Server ID string | string | Used for the MOTD. See below for details. |
Unconnected Pong message is sent by the server to the client in response to the Unconnected Ping message. It contains various data that is sent to the client such as MOTD, number of players, max player count, etc. The format is given below:
Server ID string format
For Minecraft Bedrock this is separated by semicolons and uses the following format:
Edition (MCPE or MCEE for Education Edition);MOTD line 1;Protocol Version;Version Name;Player Count;Max Player Count;Server Unique ID;MOTD line 2;Game mode;Game mode (numeric);Port (IPv4);Port (IPv6);
Example:
MCPE;Dedicated Server;390;1.14.60;0;10;13253860892328930865;Bedrock level;Survival;1;19132;19133;
Result:
The Game mode and Game mode (numeric) values seem to not be used by the client.
Connected Ping
Packet ID | Field Name | Field Type | Notes |
---|---|---|---|
0x00 | Time | Long |
This is the first packet sent in the Encapsulated Frame Set Packet by the client to the server. It is sent with the reliability type Unreliable so it can be handled immediately by the server. It is used for calculating the average ping between the client and the server.
Connected Pong
Packet ID | Field Name | Field Type | Notes |
---|---|---|---|
0x03 | Ping Time | Long | |
Pong Time | Long |
Connected Pong message is sent in response to the Connected Ping message with reliability type set to Unreliable so it can be handled immediately by the client.
Open Connection Request 1
Packet ID | Field Name | Field Type | Notes |
---|---|---|---|
0x05 | Magic | MAGIC | |
Protocol version | byte | Currently 11 | |
MTU | Zero padding | The MTU sent in the response appears to be somewhere around the size of this padding + 46 (28 udp overhead, 1 packet id, 16 magic, 1 protocol version). This padding seems to be used to discover the maximum packet size the network can handle. |
The client sends these to the target server with ever decreasing MTU until the server responds. This is used to discover the MTU size for the connection. According to the official docs, "The MTU size is the maximum size of a packet RakNet will generate", and "if you set the MTU size larger than your or any router along the network path takes, then the network will split the packet at best, or drop it at worst", so this process of sending decreasingly padded packets (compensating for the size of the packet itself and UDP overhead, which together make 46 bytes) seem to be used to discover the maximum packet size the network can handle. See the official documentation page for more info about the MTU size. If the RakNet protocol does not match your own, respond with the Incompatible protocol packet.
You should always respond to the first of these packets that you receive with Open Connection Reply 1, containing an MTU size of the amount of padding you received in bytes plus 46.
Open Connection Reply 1
Packet ID | Field Name | Field Type | Notes |
---|---|---|---|
0x06 | Magic | MAGIC | |
Server GUID | Long | ||
Use security? | boolean | If true, a cookie can be specified after to prevent source IP spoofing | |
Cookie | Int | Only if use security; a cookie to be sent back by the client in Open Connection Request 2 | |
MTU | short | see Open Connection Request 1 |
Open Connection Request 2
Packet ID | Field Name | Field Type | Notes |
---|---|---|---|
0x07 | Magic | MAGIC | |
Server Address | address | ||
Cookie | Int | Only present if a cookie was provided by the server in Open Connection Reply 1 | |
Client supports security | boolean | Only present if a cookie was provided by the server in Open Connection Reply 1 and always false for the vanilla client | |
MTU | short | ||
Client GUID | Long |
Open Connection Reply 2
Packet ID | Field Name | Field Type | Notes |
---|---|---|---|
0x08 | Magic | MAGIC | |
Server GUID | Long | ||
Client Address | address | ||
MTU | short | ||
Encryption enabled? | boolean |
Connection Request
Packet ID | Field Name | Field Type | Notes |
---|---|---|---|
0x09 | GUID | Long | |
Time | Long | ||
Use security? | boolean |
Connection Request Accepted
Packet ID | Field Name | Field Type | Notes |
---|---|---|---|
0x10 | Client address | address | |
System index | short | Unknown what this does. 0 works as a value. | |
Internal IDs | 10x address | Unknown what these do. 255.255.255.255:19132 for all of them seems to work, any other address will probably work as well. | |
Request time | Long | ||
Time | Long |
New Incoming Connection
Packet ID | Field Name | Field Type | Notes |
---|---|---|---|
0x13 | Server address | address | |
Internal address | 20x address | Unknown what this is used for. | |
Incoming Timestamp | Long | ||
Server Timestamp | Long |
Disconnect
Packet ID |
---|
0x15 |
Incompatible Protocol
Packet ID | Field Name | Field Type | Notes |
---|---|---|---|
0x19 | Protocol | byte | |
Magic | MAGIC | ||
Server GUID | Long |
Unconnected Ping
Packet ID | Field Name | Field Type | Notes |
---|---|---|---|
0x01, 0x02 | Time | Long | |
GUID | Long |
Frame Set Packet
Packet ID | Field Name | Field Type | Notes | ||
---|---|---|---|---|---|
0x80..0x8d | Sequence number | uint24le | |||
Frames | Flags | byte | Top 3 bits are reliability type, fourth bit is 1 when the frame is fragmented and part of a compound. | ||
Length IN BITS | unsigned short | Length of the body in bits. | |||
Reliable frame index | uint24le | only if reliable | |||
Sequenced frame index | uint24le | only if sequenced | |||
Order | Ordered frame index | uint24le | only if ordered | ||
Order channel | byte | ||||
Fragment | Compound size | int | only if fragmented | ||
Compound ID | short | ||||
Index | int | ||||
Body | ceil(length/8) bytes |
The reliability types are as follows:
ID | Name | Reliable | Ordered | Sequenced |
---|---|---|---|---|
0 | unreliable | |||
1 | unreliable sequenced | x | x | |
2 | reliable | x | ||
3 | reliable ordered | x | x | |
4 | reliable sequenced | x | x | x |
5 | unreliable (+ ACK receipt) | |||
6 | reliable (+ ACK receipt) | x | ||
7 | reliable ordered (+ ACK receipt) | x | x |
Sequenced implies ordered.
Game Packet
Packet ID | Field Name | Field Type | Notes |
---|---|---|---|
0xfe | Body | bytes | Single packet of the GAME protocol. The packet is usually compressed. |
NACK
Packet ID | Field Name | Field Type | Notes | ||
---|---|---|---|---|---|
0xa0 | Record count | short | |||
Record | Single Sequence number? | boolean | False for range, True for no range | ||
No Range | Sequence number | uint24le | Number of sequence to not acknowledge | ||
Range | Start Sequence number | uint24le | |||
End Sequence number | uint24le |
ACK
Packet ID | Field Name | Field Type | Notes | ||
---|---|---|---|---|---|
0xc0 | Record count | short | |||
Record | Single Sequence number? | boolean | False for range, True for no range | ||
No Range | Sequence number | uint24le | Number of sequence to acknowledge | ||
Range | Start Sequence number | uint24le | |||
End Sequence number | uint24le |