Difference between revisions of "Pre-release protocol"

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(Updated to 1.21-pre2)
 
Line 1: Line 1:
−
This page documents the changes from the [[Protocol|last stable Minecraft release]] (currently 1.2.5) to the current pre-release (or weekly release).
+
This page documents the changes from the [[Protocol|last stable Minecraft release]] (currently [[Protocol version numbers|1.20.6, protocol 766]]) to the current pre-release (currently [[Protocol version numbers|1.21-pre2, protocol {{Snapshot PVN|1073742024}}]]). Note that this page contains bleeding-edge information that may not be completely or correctly documented.
  
−
== New packets ==
+
One who wishes to commandeer the merging of this into [[Protocol]] when an update is made must be sure to respect any changes that may have occurred to the respective packets there.
  
−
=== Tab-complete (0xCB) ===
+
== Contents ==
  
−
''Two-way''
+
<div style="float:right;">__TOC__</div>
  
−
Sent C->S when the user presses [tab] while writing text. The payload contains all text behind the cursor.
+
=== Data types ===
  
−
The server responds with an auto-completion of the last word sent to it. In the case of regular chat, this is a player username. Command names and parameters are also supported.
+
No changes documented so far.
  
−
In the event of more than one possible completion, the server responds with the options packed into the single string field, separated by a null character. Note that as strings are UTF-16, this is two bytes wide.
+
=== Packets ===
  
 
{| class="wikitable"
 
{| class="wikitable"
−
|- class="row0"
+
! ID
−
! class="col0" | Packet ID
+
! Packet name
−
! class="col1" | Field Name
+
!colspan="2"| Documentation
−
! class="col2" | Field Type
+
|-
−
! class="col3" | Example
+
!colspan="4"| Configuration clientbound
−
! class="col4" | Notes
+
{{PacketList|0x0F|Clientbound Report Details (configuration)|rel=added}}
−
|- class="row1"
+
{{PacketList|0x10|Clientbound Server Links (configuration)|rel=added}}
−
| class="col0 centeralign" | 0xCB
+
|-
−
| class="col1 centeralign" | Text
+
!colspan="4"| Play clientbound
−
| class="col2 centeralign" | string
+
{{PacketList|0x7A|Clientbound Report Details (play)|rel=added}}
−
| class="col3 centeralign" |  
+
{{PacketList|0x7B|Clientbound Server Links (play)|rel=added}}
−
| class="col4" |
+
|-
−
|- class="row3"
 
−
! class="col0" | Total Size:
 
−
| class="col1 rightalign" colspan="4" | 3 bytes + length of string
 
 
|}
 
|}
  
−
=== Locale and View Distance (0xCC) ===
+
== Handshake ==
  
−
''Client to server''
+
No changes so far.
  
−
Sent when the player connects, or when settings are changed.
+
== Status ==
  
−
{| class="wikitable"
+
No changes so far.
−
|- class="row0"
+
 
−
! class="col0" | Packet ID
+
== Login ==
−
! class="col1" | Field Name
+
 
−
! class="col2" | Field Type
+
No changes so far.
−
! class="col3" | Example
+
 
−
! class="col4" | Notes
+
== Configuration ==
−
|- class="row1"
 
−
| class="col0 centeralign" rowspan="3" | 0xCC
 
−
| class="col1 centeralign" | Locale
 
−
| class="col2 centeralign" | string
 
−
| class="col3 centeralign" | en_GB
 
−
|- class="row2"
 
−
| class="col1 centeralign" | View distance
 
−
| class="col2 centeralign" | int
 
−
| class="col3 centeralign" | 0
 
−
| class="col4" | 0-3 for 'far', 'normal', 'short', 'tiny'.
 
−
|- class="row3"
 
−
| class="col1 centeralign" | Chat info
 
−
| class="col2 centeralign" | byte
 
−
| class="col3 centeralign" | Bits: 0: chat enabled, 2: colors enabled
 
−
|- class="row4"
 
−
! class="col0" | Total Size:
 
−
| class="col1 rightalign" colspan="4" | 7 bytes + length of string
 
−
|}
 
  
−
=== Encryption Key Response (0xFC) ===
+
=== Clientbound ===
  
−
''Client to server''
+
==== Clientbound Report Details (configuration) ====
  
−
Sent after receiving 0xFD.
+
Contains a list of key-value text entries that are included in any crash or disconnection report generated during connection to the server.
  
−
{| class="wikitable"
+
{| class="wikitable" {{added}}
−
|- class="row0"
+
! Packet ID
−
! class="col0" | Packet ID
+
! State
−
! class="col1" | Field Name
+
! Bound To
−
! class="col2" | Field Type
+
! colspan="2"| Field Name
−
! class="col3" | Example
+
! colspan="2"| Field Type
−
! class="col4" | Notes
+
! Notes
−
|- class="row1"
+
|-
−
| class="col0 centeralign" rowspan="2" | 0xFC
+
| rowspan="3"| 0x0F
−
| class="col1 centeralign" | Shared key length
+
| rowspan="3"| Configuration
−
| class="col2 centeralign" | short
+
| rowspan="3"| Client
−
| class="col3 centeralign" |
+
| colspan="2"| Details Count
−
|- class="row2"
+
| colspan="2"| {{Type|VarInt}} (32)
−
| class="col1 centeralign" | Shared key
+
| The number of details in the following array.
−
| class="col2 centeralign" | byte array
+
|-
−
| class="col3 centeralign" |  
+
| rowspan="2"| Details
−
|- class="row3"
+
| Title
−
! class="col0" | Total Size:
+
| rowspan="2"| {{Type|Array}}
−
| class="col1 rightalign" colspan="4" | 3 bytes + length of key
+
| {{Type|String}} (128)
 +
|
 +
|-
 +
| Description
 +
| {{Type|String}} (4096)
 +
|
 
|}
 
|}
  
−
=== Encryption Key Request (0xFD) ===
+
==== Clientbound Server Links (configuration) ====
  
−
''Server to client''
+
This packet contains a list of links that the Notchian client will display in the menu available from the pause menu. Link labels can be built-in or custom (i.e., any text).
  
−
Sent after handshakes.
+
{| class="wikitable" {{added}}
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! colspan="2"| Field Name
 +
! colspan="2"| Field Type
 +
! Notes
 +
|-
 +
| rowspan="4"| 0x10
 +
| rowspan="4"| Configuration
 +
| rowspan="4"| Client
 +
| colspan="2"| Links Count
 +
| colspan="2"| {{Type|VarInt}}
 +
| The number of links in the following array.
 +
|-
 +
| rowspan="3"| Links
 +
| Is built-in
 +
| rowspan="3"| {{Type|Array}}
 +
| {{Type|Boolean}}
 +
| Determines if the following label is built-in (from enum) or custom (text component).
 +
|-
 +
| Label
 +
| {{Type|VarInt}} {{Type|Enum}} / {{Type|Text Component}}
 +
| See below.
 +
|-
 +
| URL
 +
| {{Type|String}}
 +
| Valid URL.
 +
|}
  
−
{| class="wikitable"
 
−
|- class="row0"
 
−
! class="col0" | Packet ID
 
−
! class="col1" | Field Name
 
−
! class="col2" | Field Type
 
−
! class="col3" | Example
 
−
! class="col4" | Notes
 
−
|- class="row1"
 
−
| class="col0 centeralign" rowspan="3" | 0xFD
 
−
| class="col1 centeralign" | Server id
 
−
| class="col2 centeralign" | string
 
−
|- class="row2"
 
−
| class="col1 centeralign" | Public key length
 
−
| class="col2 centeralign" | short
 
−
|- class="row3"
 
−
| class="col1 centeralign" | Public key
 
−
| class="col2 centeralign" | byte array
 
−
|- class="row4"
 
−
! class="col0" | Total Size:
 
−
| class="col1 rightalign" colspan="4" | 5 bytes + length of string + length of key
 
−
|}
 
  
−
== Changed packets ==
+
{| class="wikitable" {{added}}
 +
! ID
 +
! Name
 +
! Notes
 +
|-
 +
| 0
 +
| Bug Report
 +
| Displayed on connection error screen; included as a comment in the disconnection report.
 +
|-
 +
| 1
 +
| Community Guidelines
 +
|
 +
|-
 +
| 2
 +
| Support
 +
|
 +
|-
 +
| 3
 +
| Status
 +
|
 +
|-
 +
| 4
 +
| Feedback
 +
|
 +
|-
 +
| 5
 +
| Community
 +
|
 +
|-
 +
| 6
 +
| Website
 +
|
 +
|-
 +
| 7
 +
| Forums
 +
|
 +
|-
 +
| 8
 +
| News
 +
|
 +
|-
 +
| 9
 +
| Announcements
 +
|
 +
|-
 +
|}
  
−
=== Login Request (0x01) ===
+
=== Serverbound ===
  
−
''Two-Way''
+
No changes so far.
  
−
Just a guess: stripped unused string field.
+
== Play ==
  
−
'''Client to Server'''
+
=== Clientbound ===
  
−
{| class="wikitable"
+
==== Clientbound Report Details (play) ====
−
|- class="row0"
 
−
! class="col0" | Packet ID
 
−
! class="col1" | Field Name
 
−
! class="col2" | Field Type
 
−
! class="col3" | Example
 
−
! class="col4" | Notes
 
−
|- class="row1"
 
−
| class="col0 centeralign" rowspan="7" | 0x01
 
−
| class="col1 centeralign" | Protocol Version
 
−
| class="col2 centeralign" | int
 
−
| class="col3 centeralign" | <code>20</code>
 
−
| class="col4" | 1.2.5's protocol version is <code>29</code>
 
−
|- class="row2"
 
−
| class="col0 centeralign" | Username
 
−
| class="col1 centeralign" | string
 
−
| class="col2 centeralign" | <code>TkTech</code>
 
−
| class="col3" | The name of the user attempting to login, max length of 16
 
−
|- class="row3"
 
−
| class="col0 centeralign" | Not used
 
−
| class="col1 centeralign" | int
 
−
| class="col2 centeralign" | <code>0</code>
 
−
| class="col3" |
 
−
|- class="row4"
 
−
| class="col0 centeralign" | Not used
 
−
| class="col1 centeralign" | int
 
−
| class="col2 centeralign" | <code>0</code>
 
−
| class="col3" |
 
−
|- class="row5"
 
−
| class="col0 centeralign" | Not used
 
−
| class="col1 centeralign" | byte
 
−
| class="col2 centeralign" | <code>0</code>
 
−
| class="col3" |
 
−
|- class="row6"
 
−
| class="col0 centeralign" | Not used
 
−
| class="col1 centeralign" | unsigned byte
 
−
| class="col2 centeralign" | <code>0</code>
 
−
| class="col3" |
 
−
|- class="row7"
 
−
| class="col0 centeralign" | Not used
 
−
| class="col1 centeralign" | unsigned byte
 
−
| class="col2 centeralign" | <code>0</code>
 
−
| class="col3" |
 
−
|- class="row8"
 
−
! class="col0" | Total Size:
 
−
| class="col1 rightalign" colspan="4" | 20 bytes + length of strings
 
−
|}
 
  
−
'''Server to Client'''
+
Contains a list of key-value text entries that are included in any crash or disconnection report generated during connection to the server.
  
−
{| class="wikitable"
+
{| class="wikitable" {{added}}
−
|- class="row0"
+
! Packet ID
−
! class="col0" | Packet ID
+
! State
−
! class="col1" | Field Name
+
! Bound To
−
! class="col2" | Field Type
+
! colspan="2"| Field Name
−
! class="col3" | Example
+
! colspan="2"| Field Type
−
! class="col4" | Notes
+
! Notes
−
|- class="row1"
+
|-
−
| class="col0 centeralign" rowspan="7" | 0x01
+
| rowspan="3"| 0x7A
−
| class="col1 centeralign" | Entity ID
+
| rowspan="3"| Configuration
−
| class="col2 centeralign" | int
+
| rowspan="3"| Client
−
| class="col3 centeralign" | <code>1298</code>
+
| colspan="2"| Details Count
−
| class="col4" | The Players Entity ID
+
| colspan="2"| {{Type|VarInt}} (32)
−
|- class="row2"
+
| The number of details in the following array.
−
| class="col0 centeralign" | Level Type
+
|-
−
| class="col1 centeralign" | string
+
| rowspan="2"| Details
−
| class="col2 centeralign" | default
+
| Title
−
| class="col3" | default or SUPERFLAT; level-type in server.properties
+
| rowspan="2"| {{Type|Array}}
−
|- class="row3"
+
| {{Type|String}} (128)
−
| class="col0 centeralign" | Server mode
+
|
−
| class="col1 centeralign" | int
+
|-
−
| class="col2 centeralign" | <code>0</code>
+
| Description
−
| class="col3" | 0 for survival, 1 for creative
+
| {{Type|String}} (4096)
−
|- class="row4"
+
|
−
| class="col0 centeralign" | Dimension
 
−
| class="col1 centeralign" | int
 
−
| class="col2 centeralign" | <code>0</code>
 
−
| class="col3" | <code>-1</code>: The Nether, <code>0</code>: The Overworld, <code>1</code>: The End
 
−
|- class="row5"
 
−
| class="col0 centeralign" | Difficulty
 
−
| class="col1 centeralign" | byte
 
−
| class="col2 centeralign" | <code>1</code>
 
−
| class="col3" | <code>0</code> thru <code>3</code> for Peaceful, Easy, Normal, Hard
 
−
|- class="row6"
 
−
| class="col0 centeralign" | Not used
 
−
| class="col1 centeralign" | unsigned byte
 
−
| class="col2 centeralign" | <code>0</code>
 
−
| class="col3" | Only 0 observed from vanilla server, was previously world height
 
−
|- class="row7"
 
−
| class="col0 centeralign" | Max players
 
−
| class="col1 centeralign" | unsigned byte
 
−
| class="col2 centeralign" | <code>8</code>
 
−
| class="col3" | Used by the client to draw the player list
 
−
|- class="row8"
 
−
! class="col0" | Total Size:
 
−
| class="col1 rightalign" colspan="4" | 20 bytes + length of strings
 
 
|}
 
|}
  
−
=== Hanshake (0x02) ===
+
==== Clientbound Server Links (play) ====
  
−
''Client to server only''
+
This packet contains a list of links that the Notchian client will display in the menu available from the pause menu. Link labels can be built-in or custom (i.e., any text).
  
−
{| class="wikitable"
+
{| class="wikitable" {{added}}
−
|- class="row0"
+
! Packet ID
−
! class="col0" | Packet ID
+
! State
−
! class="col1" | Field Name
+
! Bound To
−
! class="col2" | Field Type
+
! colspan="2"| Field Name
−
! class="col3" | Example
+
! colspan="2"| Field Type
−
! class="col4" | Notes
+
! Notes
−
|- class="row1"
+
|-
−
| class="col0 centeralign" rowspan="2" | 0x02
+
| rowspan="4"| 0x7B
−
| class="col1 centeralign" | Protocol Version
+
| rowspan="4"| Configuration
−
| class="col2 centeralign" | byte
+
| rowspan="4"| Client
−
| class="col3 centeralign" | <code>31</code>
+
| colspan="2"| Links Count
−
| class="col4" |  
+
| colspan="2"| {{Type|VarInt}}
−
|- class="row2"
+
| The number of links in the following array.
−
| class="col1 centeralign" | Username <del>and Host</del>
+
|-
−
| class="col2 centeralign" | string
+
| rowspan="3"| Links
−
| class="col3 centeralign" | <code>TkTech</code>
+
| Is built-in
−
| class="col4" | The username of the player attempting to connect<del>, and the host he is connecting to, seperated by a semicolon.</del>
+
| rowspan="3"| {{Type|Array}}
−
|- class="row3"
+
| {{Type|Boolean}}
−
! class="col0" | Total Size:
+
| Determines if the following label is built-in (from enum) or custom (text component).
−
| class="col1 rightalign" colspan="4" | 4 bytes + length of string
+
|-
 +
| Label
 +
| {{Type|VarInt}} {{Type|Enum}} / {{Type|Text Component}}
 +
| See below.
 +
|-
 +
| URL
 +
| {{Type|String}}
 +
| Valid URL.
 
|}
 
|}
  
−
== Protocol History ==
+
{| class="wikitable" {{added}}
 +
! ID
 +
! Name
 +
! Notes
 +
|-
 +
| 0
 +
| Bug Report
 +
| Displayed on connection error screen; included as a comment in the disconnection report.
 +
|-
 +
| 1
 +
| Community Guidelines
 +
|
 +
|-
 +
| 2
 +
| Support
 +
|
 +
|-
 +
| 3
 +
| Status
 +
|
 +
|-
 +
| 4
 +
| Feedback
 +
|
 +
|-
 +
| 5
 +
| Community
 +
|
 +
|-
 +
| 6
 +
| Website
 +
|
 +
|-
 +
| 7
 +
| Forums
 +
|
 +
|-
 +
| 8
 +
| News
 +
|
 +
|-
 +
| 9
 +
| Announcements
 +
|
 +
|-
 +
|}
 +
 
 +
=== Serverbound ===
 +
 
 +
No changes so far.
  
−
=== 2012-04-26 ===
+
[[Category:Minecraft Modern]]
−
* 12w17a
 
−
* Protocol version is now 31
 
−
* After exchanging handshakes, RC4 based encryption is initiated. The server sends 0xFD, which is replied by the client using 0xFC.
 
−
* Changed packet: 0x01 Login Request
 
−
* Changed packet: 0x02 Handshake
 
−
* Changed packet: 0xCC Locale and View Distance
 
−
* New packet: 0xFC Encryption Key Response
 
−
* New packet: 0xFD Encryption Key Request
 
−
=== 2012-04-19 ===
 
−
* 12w16a
 
−
* Protocol version is now 30
 
−
* New packet: 0xCB Tab-complete
 
−
* New packet: 0xCC Locale and View Distance
 

Latest revision as of 10:40, 8 June 2024

This page documents the changes from the last stable Minecraft release (currently 1.20.6, protocol 766) to the current pre-release (currently 1.21-pre2, protocol Snapshot 200). Note that this page contains bleeding-edge information that may not be completely or correctly documented.

One who wishes to commandeer the merging of this into Protocol when an update is made must be sure to respect any changes that may have occurred to the respective packets there.

Contents

Data types

No changes documented so far.

Packets

ID Packet name Documentation
Configuration clientbound
0x0F Clientbound Report Details (configuration) Pre
0x10 Clientbound Server Links (configuration) Pre
Play clientbound
0x7A Clientbound Report Details (play) Pre
0x7B Clientbound Server Links (play) Pre

Handshake

No changes so far.

Status

No changes so far.

Login

No changes so far.

Configuration

Clientbound

Clientbound Report Details (configuration)

Contains a list of key-value text entries that are included in any crash or disconnection report generated during connection to the server.

Packet ID State Bound To Field Name Field Type Notes
0x0F Configuration Client Details Count VarInt (32) The number of details in the following array.
Details Title Array String (128)
Description String (4096)

Clientbound Server Links (configuration)

This packet contains a list of links that the Notchian client will display in the menu available from the pause menu. Link labels can be built-in or custom (i.e., any text).

Packet ID State Bound To Field Name Field Type Notes
0x10 Configuration Client Links Count VarInt The number of links in the following array.
Links Is built-in Array Boolean Determines if the following label is built-in (from enum) or custom (text component).
Label VarInt Enum / Text Component See below.
URL String Valid URL.


ID Name Notes
0 Bug Report Displayed on connection error screen; included as a comment in the disconnection report.
1 Community Guidelines
2 Support
3 Status
4 Feedback
5 Community
6 Website
7 Forums
8 News
9 Announcements

Serverbound

No changes so far.

Play

Clientbound

Clientbound Report Details (play)

Contains a list of key-value text entries that are included in any crash or disconnection report generated during connection to the server.

Packet ID State Bound To Field Name Field Type Notes
0x7A Configuration Client Details Count VarInt (32) The number of details in the following array.
Details Title Array String (128)
Description String (4096)

Clientbound Server Links (play)

This packet contains a list of links that the Notchian client will display in the menu available from the pause menu. Link labels can be built-in or custom (i.e., any text).

Packet ID State Bound To Field Name Field Type Notes
0x7B Configuration Client Links Count VarInt The number of links in the following array.
Links Is built-in Array Boolean Determines if the following label is built-in (from enum) or custom (text component).
Label VarInt Enum / Text Component See below.
URL String Valid URL.
ID Name Notes
0 Bug Report Displayed on connection error screen; included as a comment in the disconnection report.
1 Community Guidelines
2 Support
3 Status
4 Feedback
5 Community
6 Website
7 Forums
8 News
9 Announcements

Serverbound

No changes so far.

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