Protocols/OSCAR/SNAC
| OSCAR Protocol |
| Introduction • Terms • Clients |
| Basic |
| Datatypes • FLAP • SNAC • TLV |
| UUIDs • Errors • Tool IDs |
| Host Interaction |
| Rate Limits • Migration • Messages |
| Other Services |
| ADMIN • ADVERT • ALERT |
| BART • BOS • BUCP • CHAT |
| CHAT_NAV |
| Tutorials |
| Sign On • BART • Rendezvous |
| ICBM • Locate • Buddies |
| Foodgroups |
| OSERVICE (0x0001) |
| LOCATE (0x0002) |
| BUDDY (0x0003) |
| ICBM (0x0004) |
| ADVERT (0x0005) |
| INVITE (0x0006) |
| ADMIN (0x0007) |
| POPUP (0x0008) |
| PD (0x0009) |
| USER_LOOKUP (0x000A) |
| STATS (0x000B) |
| TRANSLATE (0x000C) |
| CHAT_NAV (0x000D) |
| CHAT (0x000E) |
| ODIR (0x000F) |
| BART (0x0010) |
| FEEDBAG (0x0013) |
| ICQ (0x0015) |
| BUCP (0x0017) |
| ALERT (0x0018) |
| PLUGIN (0x0022) |
| UNNAMED_FG_24 (0x0024) |
| MDIR (0x0025) |
| ARS (0x044A) |
SNAC notes from another
SNACs (Simple Network Atomic Communication) are used to represent the protocol messages that are sent between the client and backend. The messages are separated into different categories, called foodgroups. Within each foodgroup there are different kinds of messages related to the category.
Datatype: SNAC__Header
The FLAP Header will be immediately followed by the SNAC Header that describes what type of message it is for SNAC messages sent over FLAP. The SNAC Header is a simple 10 byte header that contains the foodgroup, type, any high level flags, and the requestId. The requestId is used to link up requests and replies and can also be used to determine the direction of traffic.
A client should never set the high bit of a requestId or use 0. The server will always set the high bit for its requestId unless it is a reply to a client query, in which case it will use the same requestId as the request. The flags field tells the client if for the same request there will be multiple replies and if there are any SNAC Header TLVs.
| Name | Type | Notes |
|---|---|---|
| id | SNAC__ID | Foodgroup and message type |
| flags | uint16 (word) | [Class: SNAC__HEADER_FLAGS] Flags |
| requestId | uint32 (dword) | Used to link requests and replies |
Datatype: SNAC__ID
Describes the foodgroup and type this SNAC represents
| Name | Type | Notes |
|---|---|---|
| foodgroup | uint16 (word) | Numeric value that represents the foodgroup the SNAC is in |
| type | uint16 (word) | Numeric value that represent the SNAC type |
Class: SNAC__HEADER_FLAGS
These are the flags that let the client know details about the SNAC being received.
| Name | Value | Notes |
|---|---|---|
| SNAC_HEADER_FLAGS_MORE_REPLIES_FOLLOW | 0x0001 | More replies follow this message using the same requestId; the last reply is easily detectable because it will not have this flag set |
| SNAC_HEADER_FLAGS_CLIENT_SNAC | 0x0002 | NOT CURRENTLY DOCUMENTED |
| SNAC_HEADER_FLAGS_OPT_TLV_PRESENT | 0x8000 | A tlvLBlock immediately follows the SNAC header before the rest of the fields |
