Difference between revisions of "Pre-release protocol"

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(Updated to 1.21-pre2)
 
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−
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
 
−
! class="col1" | Field Name
 
−
! class="col2" | Field Type
 
−
! class="col3" | Example
 
−
! class="col4" | Notes
 
−
|- class="row1"
 
−
| class="col0 centeralign" rowspan="4" | 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="col1 centeralign" | Unknown
 
−
| class="col2 centeralign" | byte
 
−
| class="col3 centeralign" | 0
 
−
| class="col4 centeralign" | First three bits(bitmask 0x7) are used as int, bit four(bitmask 0x8) is used as bool
 
−
|- class="row5"
 
−
! class="col0" | Total Size:
 
−
| class="col1 rightalign" colspan="4" | 8 bytes + length of string
 
−
|}
 
  
−
=== Encryption Key Response (0xFC) ===
+
== Login ==
  
−
''Two-Way''
+
No changes so far.
  
−
Sent by the client after receiving 0xFD. The server responds with 0xFC, too (but with an empty Shared key).
+
== Configuration ==
  
−
The shared key is a client-generated, 16 bytes long key for RC4 encryption. The key is encrypted with RSA with the public key from the Encryption Key Request packet.
+
=== Clientbound ===
  
−
{| class="wikitable"
+
==== Clientbound Report Details (configuration) ====
−
|- 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="2" | 0xFC
 
−
| class="col1 centeralign" | Shared key length
 
−
| class="col2 centeralign" | short
 
−
| class="col3 centeralign" |
 
−
|- class="row2"
 
−
| class="col1 centeralign" | Shared key
 
−
| class="col2 centeralign" | byte array
 
−
| class="col3 centeralign" |
 
−
|- class="row3"
 
−
! class="col0" | Total Size:
 
−
| class="col1 rightalign" colspan="4" | 3 bytes + length of key
 
−
|}
 
  
−
=== Encryption Key Request (0xFD) ===
+
Contains a list of key-value text entries that are included in any crash or disconnection report generated during connection to the server.
  
−
''Server to client''
+
{| class="wikitable" {{added}}
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! colspan="2"| Field Name
 +
! colspan="2"| Field Type
 +
! Notes
 +
|-
 +
| rowspan="3"| 0x0F
 +
| rowspan="3"| Configuration
 +
| rowspan="3"| Client
 +
| colspan="2"| Details Count
 +
| colspan="2"| {{Type|VarInt}} (32)
 +
| The number of details in the following array.
 +
|-
 +
| rowspan="2"| Details
 +
| Title
 +
| rowspan="2"| {{Type|Array}}
 +
| {{Type|String}} (128)
 +
|
 +
|-
 +
| Description
 +
| {{Type|String}} (4096)
 +
|
 +
|}
  
−
Sent after handshakes.
+
==== Clientbound Server Links (configuration) ====
  
−
Public key encryption: RSA.
+
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="3" | 0xFD
+
| rowspan="4"| 0x10
−
| class="col1 centeralign" | Server id
+
| rowspan="4"| Configuration
−
| class="col2 centeralign" | string
+
| rowspan="4"| Client
−
|- class="row2"
+
| colspan="2"| Links Count
−
| class="col1 centeralign" | Public key length
+
| colspan="2"| {{Type|VarInt}}
−
| class="col2 centeralign" | short
+
| The number of links in the following array.
−
|- class="row3"
+
|-
−
| class="col1 centeralign" | Public key
+
| rowspan="3"| Links
−
| class="col2 centeralign" | byte array
+
| Is built-in
−
|- class="row4"
+
| rowspan="3"| {{Type|Array}}
−
! class="col0" | Total Size:
+
| {{Type|Boolean}}
−
| class="col1 rightalign" colspan="4" | 5 bytes + length of string + length of key
+
| 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.
 
|}
 
|}
  
−
=== Named Sound Effect (0x3E) ===
 
  
−
''Server to client''
+
{| 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
 +
|
 +
|-
 +
|}
  
−
Used to play a sound effect on the client.
+
=== Serverbound ===
  
−
{| class="wikitable"
+
No changes so far.
−
|- 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="6" | 0x3E
 
−
| class="col1 centeralign" | Sound name
 
−
| class="col2 centeralign" | string
 
−
| class="col3 centeralign" | step.grass
 
−
| class="col4 centeralign" | 250
 
−
|- class="row2"
 
−
| class="col1 centeralign" | Effect position X
 
−
| class="col2 centeralign" | int
 
−
| class="col3 centeralign" | 250
 
−
| class="col4 centeralign" | effect X multiplied by 8
 
−
|- class="row3"
 
−
| class="col1 centeralign" | Effect position Y
 
−
| class="col2 centeralign" | int
 
−
| class="col3 centeralign" | 250
 
−
| class="col4 centeralign" | effect Y multiplied with 8
 
−
|- class="row4"
 
−
| class="col1 centeralign" | Effect position Z
 
−
| class="col2 centeralign" | int
 
−
| class="col3 centeralign" | 250
 
−
| class="col4 centeralign" | effect Z multiplied with 8
 
−
|- class="row5"
 
−
| class="col1 centeralign" | Unknown
 
−
| class="col2 centeralign" | byte
 
−
| class="col3 centeralign" | 9
 
−
| class="col4 centeralign" |
 
−
|- class="row6"
 
−
| class="col1 centeralign" | Unknown
 
−
| class="col2 centeralign" | byte
 
−
| class="col3 centeralign" | 63
 
−
| class="col4 centeralign" |
 
−
|- class="row7"
 
−
! class="col0" | Total Size:
 
−
| class="col1 rightalign" colspan="4" | 17 bytes + length of string
 
−
|}
 
  
−
== Changed packets ==
+
== Play ==
  
−
=== Login Request (0x01) ===
+
=== Clientbound ===
  
−
''Two-Way''
+
==== Clientbound Report Details (play) ====
  
−
Just a guess: stripped unused string field.
+
Contains a list of key-value text entries that are included in any crash or disconnection report generated during connection to the server.
  
−
'''Client to Server'''
+
{| class="wikitable" {{added}}
−
 
+
! Packet ID
−
{| class="wikitable"
+
! State
−
|- class="row0"
+
! Bound To
−
! class="col0" | Packet ID
+
! colspan="2"| Field Name
−
! class="col1" | Field Name
+
! colspan="2"| Field Type
−
! class="col2" | Field Type
+
! Notes
−
! class="col3" | Example
+
|-
−
! class="col4" | Notes
+
| rowspan="3"| 0x7A
−
|- class="row1"
+
| rowspan="3"| Configuration
−
| class="col0 centeralign" rowspan="1" | 0x01
+
| rowspan="3"| Client
−
| class="col1 centeralign" |  
+
| colspan="2"| Details Count
−
| class="col2 centeralign" |  
+
| colspan="2"| {{Type|VarInt}} (32)
−
| class="col3 centeralign" |  
+
| The number of details in the following array.
−
| class="col4" | This packet is sent by the client and empty
+
|-
−
|- class="row8"
+
| rowspan="2"| Details
−
! class="col0" | Total Size:
+
| Title
−
| class="col1 rightalign" colspan="4" | 1 byte
+
| rowspan="2"| {{Type|Array}}
 +
| {{Type|String}} (128)
 +
|
 +
|-
 +
| Description
 +
| {{Type|String}} (4096)
 +
|
 
|}
 
|}
  
−
'''Server to Client'''
+
==== Clientbound Server Links (play) ====
  
−
{| class="wikitable"
+
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="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" | Entity ID
 
−
| class="col2 centeralign" | int
 
−
| class="col3 centeralign" | <code>1298</code>
 
−
| class="col4" | The Players Entity ID
 
−
|- class="row2"
 
−
| class="col0 centeralign" | Level Type
 
−
| class="col1 centeralign" | string
 
−
| class="col2 centeralign" | default
 
−
| class="col3" | default or SUPERFLAT; level-type in server.properties
 
−
|- class="row3"
 
−
| class="col0 centeralign" | Server mode
 
−
| class="col1 centeralign" | byte
 
−
| class="col2 centeralign" | <code>0</code>
 
−
| class="col3" | 0 for survival, 1 for creative
 
−
|- class="row4"
 
−
| class="col0 centeralign" | Dimension
 
−
| class="col1 centeralign" | byte
 
−
| 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" | 12 bytes + length of strings
 
−
|}
 
  
−
=== Hanshake (0x02) ===
+
{| class="wikitable" {{added}}
−
 
+
! Packet ID
−
''Client to server only'' - before encryption, not sure what happens thereafter, may still be a server reply --[[User:Ceiru|Ceiru]] 23:12, 27 April 2012 (MST)
+
! State
−
 
+
! Bound To
−
{| class="wikitable"
+
! colspan="2"| Field Name
−
|- class="row0"
+
! colspan="2"| Field Type
−
! class="col0" | Packet ID
+
! Notes
−
! class="col1" | Field Name
+
|-
−
! class="col2" | Field Type
+
| rowspan="4"| 0x7B
−
! class="col3" | Example
+
| rowspan="4"| Configuration
−
! class="col4" | Notes
+
| rowspan="4"| Client
−
|- class="row1"
+
| colspan="2"| Links Count
−
| class="col0 centeralign" rowspan="4" | 0x02
+
| colspan="2"| {{Type|VarInt}}
−
| class="col1 centeralign" | Protocol Version
+
| The number of links in the following array.
−
| class="col2 centeralign" | byte
+
|-
−
| class="col3 centeralign" | <code>31</code>
+
| rowspan="3"| Links
−
| class="col4" |  
+
| Is built-in
−
|- class="row2"
+
| rowspan="3"| {{Type|Array}}
−
| class="col1 centeralign" | Username <del>and Host</del>
+
| {{Type|Boolean}}
−
| class="col2 centeralign" | string
+
| Determines if the following label is built-in (from enum) or custom (text component).
−
| class="col3 centeralign" | <code>TkTech</code>
+
|-
−
| class="col4" | The username of the player attempting to connect<del>, and the host he is connecting to, seperated by a semicolon.</del>
+
| Label
−
|- class="row3"
+
| {{Type|VarInt}} {{Type|Enum}} / {{Type|Text Component}}
−
| class="col1 centeralign" | Server Host
+
| See below.
−
| class="col2 centeralign" | string
+
|-
−
| class="col3 centeralign" | <code>localhost</code>
+
| URL
−
| class="col4" |  
+
| {{Type|String}}
−
|- class="row4"
+
| Valid URL.
−
| class="col1 centeralign" | Server Port
 
−
| class="col2 centeralign" | int
 
−
| class="col3 centeralign" | <code>25565</code>
 
−
| class="col4" |
 
−
|- class="row5"
 
−
! class="col0" | Total Size:
 
−
| class="col1 rightalign" colspan="4" | 10 bytes + length of strings
 
 
|}
 
|}
  
−
== 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
 +
|
 +
|-
 +
|}
  
−
=== 2012-05-03 ===
+
=== Serverbound ===
−
* 12w18a
 
−
* New packet: 0x3D Name Sound Effect
 
−
* Changed packet: 0x01 Login Request
 
−
* Changed packet: 0x02 Handhshake
 
−
* Changed packet: 0xCA Player Abilities
 
−
* Changed packet: 0xCC Player Settings
 
−
* Changed packet: 0x09 Respawn
 
−
* Removed packet: 0x32 Map Column Allocation
 
−
* This items are not enchantable in this version: 0x103, 0x105, 0x15A, 0x167, 0x10C, 0x10D, 0x10E, 0x10F, 0x122, 0x110, 0x111, 0x112, 0x113, 0x123, 0x10B, 0x100, 0x101, 0x102, 0x124, 0x114, 0x115, 0x116, 0x117, 0x125, 0x11B, 0x11C, 0x11D, 0x11E, 0x126
 
  
−
=== 2012-04-26 ===
+
No changes so far.
−
* 12w17a
 
−
* Protocol version is now 31
 
−
* RC4 based encryption, described in [[Protocol_Encryption]]
 
−
* 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
 
−
* New Item: Book & Quills (0x182) is enchantable
 
−
* New Item: Written Book (0x183) is enchantable
 
  
−
=== 2012-04-19 ===
+
[[Category:Minecraft Modern]]
−
* 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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