Valhalla Legends Archive

I have no idea how to handle an in-game packet when the resend field is something else than 0.

The seq1 and seq2 of the resend packet determine which one to resend and thats all i know.
Sometime the packet to resend doesnt even exist. And the resend field happen to be more than 1, with 1 byte in the datas .. wtf ??

and another question. that resend thing only happen in lag/packet doesnt reach right ??

Heres some juicy info

Quote from: bLueStar
########################################################
## JOIN GAME SEQUENCE - DATA SENT THROUGH UDP TO HOST ##
########################################################

HEADER :
(DWORD) Null Padding          
(WORD) Data Checksum            
(WORD) Data Length            
(WORD) Seq. 1                    
(WORD) Seq. 2                  
(BYTE) CLS                    
(BYTE) Command              
(BYTE) Player ID            
(BYTE) Resend                
(VOID) Data



************************************************************************************************************************************************
*   NOTES:   
*
*   The type (STRING) always end with 0x00 even when the string is empty.
*                                                   
*   CLS can be either 0, 1 or 2.                                             
*   Theres a Seq1 and a Seq2 for the 3 kind of CLS.                                       
*          
*   Seq1 start at 0 and Seq2 start at 1 for CLS 0
*                                                     
*   When you send a packet : Send the datas and then increase the Seq1 of the aimed CLS by one.                                            
*   When you receive a packet : The Seq2 of the aimed CLS become the Seq1 received + 1                                                    
*   When you receive the SERVER GAME INFO packet, the Seq1 of the CLS 2 become "CurrentClass2Sequence" found in SERVER GAME INFO structure.
*   This sequence number (Seq1 and Seq2) are used to synchronize each players/packets. The host give you what Seq2 was when you joined.    
*   The host will be the first to send you a CLS 2 packet so the Seq2 of CLS 2 will become his Seq1 + 1.                                  
************************************************************************************************************************************************



DETAILED JOIN SEQUENCE :

1) Send : CLIENT GAME JOIN REQUEST (SEND 3 TIME THE EXACT SAME PACKET AND INCREASE THE SEQUENCE ONLY ONCE)
2) Receive : SERVER GAME JOIN REPLY
3) Send : CLIENT UNKNOWN (RESPONSE TO "SERVER GAME JOIN REPLY" ?)
4) Send : CLIENT PLAYER INFO
5) Receive : SERVER GAME INFO
   For each playerCount in SERVER GAME INFO {
6)      Receive : SERVER PLAYERS INFO
   }
7) Receive : SERVER END OF PLAYER INFO ??
8) Receive : SERVER GAME SETTING INFO
9) Send : Reply to SERVER GAME SETTING INFO with an empty CLS 0, CMD 4 packet
10) Receive : CLS 0, CMD 4 packet
11) Send : Reply to last packet with an empty CLS 0, CMD 5 packet

Begin of CLS 2 Synchronization






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Title: CLIENT GAME JOIN REQUEST
Direction: C>S
Class: 00
Command: 01
Player ID: FF <---- you still dont know your player ID
Resend: 00
Data:
(DWORD) Unknown - Always 0x00000001



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Title: SERVER GAME JOIN REPLY
Direction: C<S
Class: 00
Command: 02
Player ID: 00
Resend: 00
Data:
(DWORD) Result - Always 0x00000001 (maybe to confirm that this is a listening starcraft game)



------------------------------------------------------------------------------------------------------------------



Title: CLIENT UNKNOWN (RESPONSE TO "SERVER GAME JOIN REPLY" ?)
Direction: C>S
Class: 00
Command: 03
Player ID: FF <---- you still dont know your player ID
Resend: 00
Data:
(DWORD) Unknown - Always 0x00000001



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Title: CLIENT PLAYER INFO
Direction: C>S
Class: 00
Command: 07
Player ID: FF <---- you still dont know your player ID
Resend: 00
Data:
(STRING) Username
(STRING) StatsFromProduct
(STRING) Unknown - Always empty



------------------------------------------------------------------------------------------------------------------



Title: SERVER GAME INFO
Direction: C<S
Class: 00
Command: 08
Player ID: 00
Resend: 00
Data:
(DWORD) PlayersCount (Computer doesn't count)
(DWORD) UsableSlotsCount
(DWORD) CurrentClass2Sequence
(DWORD) Unknown - Always 0x00000004
(DWORD) GameTimeElapsed (in seconds)
(STRING) GameName
(STRING) GameStats
(STRING) Unknown - Always empty



------------------------------------------------------------------------------------------------------------------



Title: SERVER PLAYERS INFO
Direction: C<S
Class: 00
Command: 06
Player ID: 00
Resend: 00
Data:
(DWORD) DataSize
(DWORD) playerID
(DWORD) isHost
(DWORD) Unknown - Always 0x00000000
(DWORD) CurrentClass2Sequence
(WORD) Unknown - 0x0002 when not host
(WORD) PlayerPort - 0x0000 if host
(DWORD) PlayerIP - 0x00000000 if host
(DWORD) Unknown - Always 0x00000000
(DWORD) Unknown - Always 0x00000000
(STRING) Username
(STRING) StatsString - Empty if host



------------------------------------------------------------------------------------------------------------------



Title: SERVER END OF PLAYER INFO ??
Direction: C<S
Class: 00
Command: 0F
Player ID: 00
Resend: 00
Data:
(DWORD) Unknown - Always 0x00000000



------------------------------------------------------------------------------------------------------------------



Title: SERVER GAME SETTING INFO
Direction: C<S
Class: 00
Command: 09
Player ID: 00
Resend: 00
Data:
(WORD) GameType - (0x02 = Melee, 0x03 = FFA, 0x04 = 1v1, 0x05 = CTF, 0x06 = Greed, 0x07 = Slaughter, 0x08 = Sudden Death, 0x0A = UMS, 0x0B = Team Melee, 0x0C = Team FFA, 0x0D = Team CTF, 0x0F = TvB)

If GameType = Greed
   (WORD) Unknown - Always 0x0001
   (WORD) Ressource
If GameType = Slaughter
   (WORD) Unknown - Always 0x0001
   (WORD) Minutes
If GameType = Team Melee OR GameType = Team FFA OR GameType = Team CTF
   (WORD) Unknown - NumberOfTeams - 1 ??
   (WORD) NumberOfTeams
If GameType = TvB
   (WORD) MatchUp - determine the amount of players in Home Team
   (WORD) MatchUp - same...wtf?
Else
   (WORD) Unknown - Always 0x0001
   (WORD) Unknown - Always 0x0000


(WORD) Unknown - Always 0x0000
(BYTE) Unknown - (Logged : 0x01)
(BYTE) Unknown - (Logged : 0x01)
(BYTE) Unknown - (Logged : 0x01)
(BYTE) Unknown - (Logged : 0x02)
(BYTE) Unknown - (Logged : 0x02)
(BYTE) Unknown - (Logged : 0x00)
(BYTE) Unknown - (Logged : 0x01)
(BYTE) Unknown - (Logged : 0x01)
(BYTE) Unknown - (Logged : 0x00)
(BYTE) Unknown - (Logged : 0x01)
(BYTE) Unknown - (Logged : 0x00)
(BYTE) Unknown - (Logged : 0x00) <---- same value as "Minutes" when GameType = Slaughter
(DWORD) Unknown - (Logged : 0x00000032)
(DWORD) Unknown - (Logged : 0x00000000)
(DWORD) Unknown - (Logged : 0x00000000)



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Anyone can help with SERVER GAME SETTING INFO??? Unknown datas has nothing to do with slots states/races/players in the game, could it be the default slot race ??