Protocol

Message Formats

Binary UDP

• Message Layout -- Explanation of message format and the message template
• Packet Layout -- the layout of the UDP payload.
• Circuits -- Establishment and common operation of UDP circuits between two nodes
• Packet Accounting -- how the message system handles packet sequencing, reliability, suppression, throttling, etc.
• Common Messages -- messages that are handled by every Indra message system instance.
• Xfer Manager -- messages used by the LLXFerManager class.
• Transfer Manager -- messages used by the LLTransferManger class.
• All messages -- an alphabetical listing of all messages in the system

Capabilities

The Capabilities system allows viewers to request abilities and be temporarily granted those abilities through a unique URL. The transport format is LLSD XML, and clients can either post new events to CAPS URLs or wait for events to come from the server on the event queue connection the client holds open.

• Capabilities

LLSD

The Linden Lab Structured Data system is an abstract way of representing data with some strong types. Three serialization formats are supported including binary, XML, and notation which are described in LLSD.

XML-RPC

The initial exchange with the login server uses XML-RPC. This will likely change in the future as the login switches over to use web authentication, removing XML-RPC from the Second Life protocol entirely.

• Authentication Flow

Protocol Systems

Appearance

• Avatar Appearance

Channels and Versions

• Channel - definition of a channel
  • Channel and Version Requirements - Linden Lab policy on the use of channels.

Directory Searches

• Search Messages

Friends

• Relationship Messages
• Mute List

Groups

• Group Messages

Inventory

• Inventory Messages
• Task Inventory

Agent

• Agent Messages
• Money Messages
• Communication Messages
• Buying Land and Currency

Objects

• Object Messages

Parcels

• Parcel Messages

Simulators

• Region Messages

File Formats

Asset Files

Files Types known by the asset system

Reference	extension	id	mime type	LSL
Textures	texture	0	image/x-j2c	INVENTORY_TEXTURE
Sounds	sound	1	application/ogg	INVENTORY_SOUND
Calling_Card	callingcard	2	application/vnd.ll.callingcard
Landmarks	landmark	3	application/vnd.ll.landmark	INVENTORY_LANDMARK
Clothing	clothing	5	application/vnd.ll.clothing	INVENTORY_CLOTHING
Primitive	primitive	6	application/vnd.ll.primitive	INVENTORY_OBJECT
Notecards	notecard	7	application/vnd.ll.notecard	INVENTORY_NOTECARD
LSL Text	lsltext	10	application/vnd.ll.lsltext	INVENTORY_SCRIPT
LSL Bytecode	lslbyte	11	application/vnd.ll.lslbyte
Bodypart	bodypart	13	application/vnd.ll.bodypart	INVENTORY_BODYPART
Animations	animatn	20	application/vnd.ll.animation	INVENTORY_ANIMATION
Gestures	gesture	21	application/vnd.ll.gesture	INVENTORY_GESTURE
Asset Wrapper	asset	unassigned	application/vnd.ll.asset