Animadoria at 19:14, 11 May 2022

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	{{Protocols/MSNP~~/MSNC_Navigation~~}}		{{Protocols/MSNP
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	=P2Pv2 Binary Headers (from MSNP16)=		=P2Pv2 Binary Headers (from MSNP16)=

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AD at 11:23, 8 December 2010

2010-12-08T11:23:01Z

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{{Protocols/MSNP/MSNC_Navigation}}

=P2Pv2 Binary Headers (from MSNP16)=

When the client Alice logs in using MSNP18, and starts a session to another WLM 2009 client Bob
(I believe Alice knows the client type of Bob by the GUID that is attached to the email in Bob's JOI command)
then the file transfer binary header is substantially changed.

All data is Big Endian.
The binary header size is dynamic - It can be between 8(0x08) and 252(0xfc).
The new P2P protocol always has header and message part is optional. Ex: Ack packets haven't message part.

0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|L|O|Len|Base ID|if L>8 then TLVs = read(L - 8) else skip ....
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| if Len > 0 then Payload = (DH and D) else skip ....
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

For all of them - (DWORD is a 32-bit, 4 byte, unsigned integer and QWORD is 64 bits, 8 bytes.)
{|
| '''1''' || BYTE || '''HL''' || '''L'''ength of header.
|-
| '''2''' || BYTE || '''OP''' || '''O'''peration code. 0: None, 2: Ack, 3: Init session.
|-
| '''3''' || WORD || '''ML''' || Message '''len'''gth without header length. (but included the header's message length)
|-
| '''4''' || DWORD || '''BaseID''' || Initially random (?) To get the next one add the payload length.
|-
| '''TLVs''' || BYTE[HL-8] || '''TLV Data''' || TLV list consists of TLV-encoded pairs (type, length, value). A whole TLV list is padded with zeros to fit 4-byte boundary. TLVs: T=0x1(1) L=0xc(12): IPv6 address of sender/receiver. T=0x2(2) L=0x4(4): ACK identifier.
|-
| '''DH''' || DHL || '''Data Header''' ||

BYTE DHL: Data header length
BYTE TFCombination: 0x1=First, 0x4=Msn object (display picture, emoticon etc), 0x6=File transfer
WORD PackageNumber: Package number
DWORD SessionID: Session Identifier
BYTE[DHL-8] Data packets TLVs: if (DHL>8) then read bytes(DHL - 8). T=0x1(1) L=0x8(8): Data remaining.
|-
| '''D''' || ML-DHL || '''Data Packet''' || SLP messsage or data packet
|-
| '''F''' || DWORD || '''Footer''' || The footer.
|}

== Examples ==

==='''First P2P message'''===

'''H''': 18 03 05 4e 13 63 d5 a0 01 0c 00 02 00 00 00 0e 76 2d 0f 01 00 00 00 00 '''DH''': 08 01 00 00 00 00 00 00 '''D''': SLPMessage

All type of header has the follow fields:
{|
| '''1''' || 0x18 || '''Length of header''' || 24
|-
| '''2''' || 0x03 || '''Operation code''' || Initialize session.
|-
| '''3''' || 0x05 0x4e || '''Size of message''' || 1358 = 1350+8(0x08)
|-
| '''4''' || 0x13 0x63 0xd5 0xa0 || '''Base ID''' || The next Base ID += Size of message
|-
| '''TLVs''' || 01 0c 00020000 000e762d 0f010000 (00 00) || '''TLV data''' || TLV = 24 - 8 = 16 bytes. T=01,L=12,V=00020000 000e762d 0f010000. (00 00 = Padded with zeros to fit 4-byte boundary.)
|-
| '''DH''' || 08 01 00 00 00 00 00 00 || '''Data Header''' ||
08=DataHeaderLength
01=TFCombination
00 00=PackageNumber
00 00 00 00 = Session ID
'''No TLV''' because DataHeaderLength - 8 = 0.
|-
| '''D''' || SLP || '''SLP''' || SLP Message
|}

==='''An acknowledgement'''===

'''H''': 08 02 00 00 93 e7 20 56 '''DH''': (no data) '''D''': (no data) '''F''': 00 00 00 00

{|
| '''1''' || 0x08 || '''Length of header''' || 8
|-
| '''2''' || 0x02 || '''Operation code''' || Acknowledgement
|-
| '''3''' || 0x00 0x00 || '''Size of message''' || 0
|-
| '''4''' || 0x93 0xe7 0x20 0x56 || '''Base ID''' || AckIdentifier = Base ID + Size of Message
|-
| '''TLVs''' || (No tlv data) || '''TLVs''' || Length of header <= 8, so no TLVs in this sample package.
|-
| '''DH''' ||(no data) || '''Data Header''' || Size of message is 0.
|-
| '''D''' || (no data) || '''Data''' || Size of message is 0.
|-
| '''F''' || 0x00 0x00 0x00 0x00 || '''Footer''' || Footer is 0 (always).
|}

==='''File Transfer'''===

'''H''': 08 00 05 70 13 63 da ee '''DH''': 14 07 00 00 d1 c5 26 da 01 08 00 00 00 00 00 02 04 1c 00 00 '''D''': ...

{|
| '''1''' || 0x08 || '''Length of header''' || 8
|-
| '''2''' || 0x00 || '''Operation code''' || None
|-
| '''3''' || 0x05 0x70 || '''Size of message''' || 1392 = 1372+20(0x14)
|-
| '''4''' || 0x13 0x63 0xda 0xee || '''Base ID''' || The next Base ID += Size of message
|-
| '''TLVs''' || (No tlv data) || '''TLVs''' || Length of header <= 8, so no TLVs in this sample package.
|-
| '''DH''' || 14 07 0000 d1c526da 01 08 00000000 0002041c 0000 || '''Data Header''' ||
0x14(20)=DataHeaderLength
0x07=TFCombination(The first file transfer message. 0x06 is all other file transfer message)
0x00 0x00=PackageNumber
0xd1 0xc5 0x26 0xda = Session ID from SLP
TLVs = 20-8=12 bytes. T(01) L(08) V(00 00 00 00 00 02 04 1c - data remaining) Padding(00 00)
|-
| '''D''' || Data || '''Data''' || File data
|}

==='''Display Picture'''===

'''H''': 08 00 05 70 03 a3 da ee '''DH''': 14 05 00 00 d1 c5 26 dc 01 08 00 00 00 00 00 00 34 f5 00 00 '''D''': ...

{|
| '''1''' || 0x08 || '''Length of header''' || 8
|-
| '''2''' || 0x00 || '''Operation code''' || None
|-
| '''3''' || 0x05 0x70 || '''Size of message''' || 1392 = 1372+20(0x14)
|-
| '''4''' || 0x03 0xa3 0xda 0xee || '''Base ID''' || The next Base ID += Size of message
|-
| '''TLVs''' || (No tlv data) || '''TLVs''' || Length of header <= 8, so no TLVs in this sample package.
|-
| '''DH''' || 14 05 0000 d1c526da 01 08 00000000 000034f5 0000 || '''Data Header''' ||
0x14(20)=DataHeaderLength
0x5=TFCombination(The first display picture message. 0x04 is all other display picture message)
0x0 0x0=PackageNumber
0xd1 0xc5 0x26 0xda = Session ID from SLP
TLVs = 20-8=12 bytes. T(01) L(08) V(00 00 00 00 00 00 34 f5 - data remaining) Padding(00 00)
|-
| '''D''' || Data || '''Data''' || Picture data
|}

= For more information =

[http://code.google.com/p/msnp-sharp/source/browse/branches/MSNPSHARP_31_STABLE/MSNPSharp/DataTransfer/P2PHeader.cs P2Pv1 and P2Pv2 Header Definitions]

[http://code.google.com/p/msnp-sharp/wiki/KB_MSNC12_BinaryHeader Binary header research on MSNC10 (The new P2P protocol used in WLM 2009 and MSNP18)]

[[Category:MSN]]
[[Category:Protocols/MSNP]]
[[Category:Work_In_Progress]]

Protocols/MSNP/MSNC/P2Pv2 Headers - Revision history

Animadoria at 19:14, 11 May 2022

AD: 1 revision imported

AD at 11:23, 8 December 2010