Protocols/OSCAR/SNAC/ICBM CHANNEL MSG TO HOST

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)

ID	Origin	Name	Foodgroup	Service	Status	Version
0x0004, 0x0006	Client	ICBM__CHANNEL_MSG_TOHOST	Unspecified	BOS	Active	1.25

This is the basic inter-client message after which the group was named (Inter-Client Basic Messages).

SNAC Header

Foodgroup	uint16 (word)	00 04
Subgroup	uint16 (word)	00 06
Flags	uint16 (word)	00 00
Request ID	uint32 (dword)	00 00 00 00

SNAC Data

Length	Description
8 bytes	Random message cookie
2 bytes	Channel ID. Can be one of the following: 0x0001 - Basic instant messages 0x0002 - Rendevous (chat inviation, file transfer negotation, send icon, etc.)
1 byte	Length L of the following
L bytes	The destination AIM screen name or ICQ number (in ASCII) of this ICBM
X bytes	TLVs

Once at the server, the SNAC is reformatted into a ICBM__CHANNEL_MSG_TOCLIENT before it is sent to the destination user.

Name	Type	Notes
cookie	ICBM Cookie	Opaque data generated by conversation initiator and used to link up the conversation and errors
channel	uint16 (word)	[Class: ICBM__CHANNELS] Channel the message is on
dest username	string08	Destination username, who should receive the message
icbmTlvs	Rest of SNAC array of TLV	[Class: ICBM__TAGS] Message data and parameters; it must contain either the IM or DATA tag

From Aleksandr Shutko: SNAC(04,06) ICBM__CHANNEL_MSG_TOHOST

Client use this snac to send message thru server. Within the ICBM (Inter-Client Basic Message) types (family 4), a channel is defined. Each channel represents a different kind of message. Channel 1 is used for what would commonly be called an "instant message" (plain text messages). Channel 2 is used for complex messages (rtf, utf8) and negotiating "rendezvous". These transactions end in something more complex happening, such as a chat invitation, or a file transfer. Channel 3 is used for chat messages (not in the same family as these channels). Channel 4 is used for various ICQ messages. Examples are normal messages, URLs, and old-style authorization. This snac contain one fixed part (target uin, channel, msg-id cookie) and channel-dependend tlv-chain. First dword in msg-id cookies is actually the computer uptime in milliseconds (ie GetTickCount(), at least this is what the ICQ Lite and the other official clients I have tested uses).  00 04   word   SNAC family  00 06   word   SNAC subtype  00 00   word   SNAC flags  xx xx xx xx   dword   SNAC request-id    xx xx xx xx  xx xx xx xx   qword   msg-id cookie    xx xx   word   message channel (see table below)    xx   byte   screenname string length    xx ..   string   screenname string  xx xx   word   TLV.Type(0xXX) - icbm info  xx xx   word   TLV.Length  ....   ....   ....   ....  .... ....  xx xx   word   TLV.Type(0xXX) - icbm info  xx xx   word   TLV.Length  ....   ....   ....

Channel 1    Channel 1 message format (plain-text messages)  Channel 2    Channel 2 message format (rtf messages, rendezvous)  Channel 4    Channel 4 message format (typed old-style messages)

Examples

From Aleksandr Shutko: SNAC(04,06)/CH1 ICBM__CHANNEL_MSG_TOHOST/CH1

Client use this snac to send message thru server on channel 1. All clients use this snac to send plain-text messages to an old clients and to clients that doesn't support channel 2 messages. TLV(0x03) and TLV(0x06) is optional.  00 04   word   SNAC family  00 06   word   SNAC subtype  00 00   word   SNAC flags  xx xx xx xx   dword   SNAC request-id  xx xx xx xx  xx xx xx xx qword   msg-id cookie  00 01 word   message channel  xx byte   screenname string length  xx .. string   screenname string  00 02   word   TLV.Type(0x02) - message data  xx xx   word   TLV.Length  05   byte   fragment identifier (array of required capabilities)  01   byte   fragment version  xx xx   word   Length of rest data  xx ...   array   byte array of required capabilities (1 - text)  01   byte   fragment identifier (text message)  01   byte   fragment version  xx xx   word   Length of rest data  00 00   word   Message charset number  ff ff   word   Message language number  xx ..   string (ascii)   Message text string  00 03   word   TLV.Type(0x03) - request an ack from server  00 00   word   TLV.Length  empty  00 06   word   TLV.Type(0x06) - store message if recipient offline  00 00   word   TLV.Length  empty

Example SNAC dumps with flap header:

2a 02 23 6c 00 47 00 04 00 06 00 00 00 01 00 06 *.#l.G.......... 67 c3 15 01 3d 3a 00 00 00 01 07 31 30 30 30 30 g...=:.....10000 30 30 00 02 00 23 05 01 00 01 01 01 01 00 1a 00 00...#.......... 00 ff ff 74 65 73 74 20 63 68 61 6e 6e 65 6c 20 ...test channel 31 20 6d 65 73 73 61 67 65 00 06 00 00 1 message....

From Aleksandr Shutko: SNAC(04,06)/CH2 ICBM__CHANNEL_MSG_TOHOST/CH2

Client use this snac to send message thru server on channel 2.  00 04   word   SNAC family  00 06   word   SNAC subtype  00 00   word   SNAC flags  xx xx xx xx   dword   SNAC request-id  xx xx xx xx  xx xx xx xx qword   msg-id cookie  00 02 word   message channel  xx byte   screenname string length  xx .. string   screenname string  00 05   word   TLV.Type(0x05) - rendezvous message data  xx xx   word   TLV.Length  xx xx   word   message type (0 - request, 1 - cancel, 2 - accept)  xx xx xx xx  xx xx xx xx   qword   msg-id cookie (same as above)  xx .. xx   guid   capability (determines format of message data in "extention data" below)  00 03   word   TLV.Type(0x03) - internal ip  xx xx   word   TLV.Length  xx xx xx xx   dword   internal ip  00 05   word   TLV.Type(0x05) - listening port  xx xx   word   TLV.Length  xx xx   word   listening port  00 0A   word   TLV.Type(0x0A) - unknown  xx xx   word   TLV.Length  xx xx   word   unknown (usually 1)  00 0B   word   TLV.Type(0x0B) - unknown  xx xx   word   TLV.Length  xx xx   word   unknown  00 0F   word   TLV.Type(0x0F) - unknown  00 00   word   TLV.Length  empty  11 27   word   TLV.Type(0x2711) - extention data  xx xx   word   TLV.Length  Following contents is capability-specific.   Data format description for capability {09461349-4C7F-11D1-8222-444553540000}  xx xx   word (LE)   length of following data  xx xx   word (LE)   protocol version  xx .. xx   guid (LE)   plugin or zero bytes  xx xx   word   unknown  xx xx xx xx   dword (LE)   client capabilities flags  xx   byte   unknown  xx xx   word (LE)   seems to be a downcounter  xx xx   word (LE)   length of following data  xx xx   word (LE)   seems to be a downcounter as in first chunk above  xx ..     unknown, usually zeros if plugin field in first chunk above is zero, here is message, overwise here is plugin-specific data.  00 03   word   TLV.Type(0x03) - request an ack from server  00 00   word   TLV.Length  empty

Example SNAC dumps with flap header:

2A 02 36 87 00 99 00 04 00 06 00 00 00 0F 00 06 *.6???.???.......... CC EB 54 00 F7 07 00 00 00 02 09 31 32 33 34 35  ??????T.???......12345 36 37 38 39 00 05 00 73 00 00 CC EB 54 00 F7 07 6789...s..??????T.???. 00 00 09 46 13 49 4C 7F 11 D1 82 22 44 45 53 54 ...F.IL?.T???"DEST 00 00 00 0A 00 02 00 01 00 0F 00 00 27 11 00 4B ............'..K 1B 00 08 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 03 00 00 00 00 FB FF 0E 00 FB ...........v???..v FF 00 00 00 00 00 00 00 00 00 00 00 00 01 00 00  ???............... 00 21 00 0E 00 54 65 73 74 20 6D 65 73 73 61 67 .!...Test messag 65 2E 00 00 00 00 00 FF FF FF 00 00 03 00 00 e......?????????.....

From Aleksandr Shutko: SNAC(04,06)/CH4 ICBM__CHANNEL_MSG_TOHOST/CH4

ICQ clients use this snac to send messages to an old/offline/invisible clients if message type != 1 or message flags != 0 (for example plain-text multi-recipient message to an offline client) but this doesn't mean that you can't send usual plain-text message on channel 4. TLV(0x03) and TLV(0x06) is optional.  00 04   word   SNAC family  00 06   word   SNAC subtype  00 00   word   SNAC flags  xx xx xx xx   dword   SNAC request-id  xx xx xx xx  xx xx xx xx   qword   msg-id cookie  00 04   word   message channel  xx   byte   screenname string length  xx ..   string   screenname string  00 05   word   TLV.Type(0x05) - message data  xx xx   word   TLV.Length  xx xx xx xx   dword (LE)   Sender uin  xx   byte   Message type  xx   byte   Message flags  xx xx   word (LE)   Message string length  xx .. 00   string (asciiz)   Message string  00 03   word   TLV.Type(0x03) - request an ack from server  00 00   word   TLV.Length  empty  00 06   word   TLV.Type(0x06) - store message if recipient offline  00 00   word   TLV.Length  empty

Example SNAC dumps with flap header:

2a 02 56 1e 00 6f 00 04-00 06 00 00 00 0b 00 06 *.V..o.......... 4e b5 6c 01 33 28 00 00-00 04 07 31 30 30 30 30 N.l.3(.....10000 30 30 00 05 00 4b 8f e4-5e 00 04 00 43 00 54 68 00...K..^...C.Th 69 73 20 69 73 20 74 68-65 20 74 65 73 74 20 75 is is the test u 72 6c 20 6d 65 73 73 61-67 65 20 74 6f 20 61 6e rl message to an 20 6f 6c 64 20 63 6c 69-65 6e 74 fe 68 74 74 70 old client.http 3a 2f 2f 68 74 74 70 2e-74 65 73 74 2e 75 72 6c  ://http.test.url 00 00 06 00 00 .....

ICBM SNACs

SNAC List Expand

Subgroup Origin Name 0x0001 Any ICBM__ERR This is the error SNAC for the ICBM foodgroup. 0x0002 Client ICBM__ADD_PARAMETERS This SNAC is typically sent prior to sending the OSERVICE__CLIENT_ONLINE so that the host is properly initialized with the clients' preferences. 0x0003 Client ICBM__DEL_PARAMETERS These are the delete all parameters for a given channel. 0x0004 Client ICBM__PARAMETER_QUERY This SNAC requests ICBM parameters from the host. 0x0005 Host ICBM__PARAMETER_REPLY This SNAC is sent by the host in response to a ICBM__PARAMETER_QUERY. 0x0006 Client ICBM__CHANNEL_MSG_TOHOST This is the basic inter-client message after which the group was named (Inter-Client Basic Messages). 0x0007 Host ICBM__CHANNEL_MSG_TOCLIENT This is the ICBM__CHANNEL_MSG_TOHOST after it has been reformatted by the host and sent to the destination client. 0x0008 Client ICBM__EVIL_REQUEST This requests that the specified user is sent an EVIL notification. 0x0009 Host ICBM__EVIL_REPLY The reply tells the requester, the sender of an ICBM__EVIL_REQUEST SNAC, how much EVIL, if any, was applied to the recipient. 0x000A Host ICBM__MISSED_CALLS When the host is unable to send one or more messages to the client, the host sends this SNAC to the client to let it know that it missed some messages ("calls"). 0x000B Any ICBM__CLIENT_ERR This error notice is one of the few SNACs that can be sent to the host and received by a client. 0x000C Host ICBM__HOST_ACK This SNAC is sent by the host upon receipt of any ICBM__CHANNEL_MSG_TOHOST which includes the optional ICBM__TLV_TAGS_REQUEST_HOST_ACK TLV. 0x000D NCD ICBM__SIN_STORED This is not currently documented. Want to contribute? 0x000E NCD ICBM__SIN_LIST_QUERY This is not currently documented. Want to contribute? 0x000F NCD ICBM__SIN_LIST_REPLY This is not currently documented. Want to contribute? 0x0010 Client ICBM__SIN_RETRIEVE This requests ICBM__CHANNEL_MSG_TOCLIENT messages be generated for each of the stored ICBMs. Any message retrieved is deleted. 0x0011 NCD ICBM__SIN_DELETE This is not currently documented. Want to contribute? 0x0012 NCD ICBM__NOTIFY_REQUEST This is not currently documented. Want to contribute? 0x0013 NCD ICBM__NOTIFY_REPLY This is not currently documented. Want to contribute? 0x0014 Any ICBM__CLIENT_EVENT This SNAC is sent as a control message, sent by a client to inform the recipient of an event, or by the host informing of an event. 0x0017 Host ICBM__SIN_REPLY The host successfully processed the request to retrieve all the offline messages.