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Gamespy in Republic Commando
Gamespy protocol analysis in Star Wars Republic Commando
Author: -ffs-PLASMA aka. HW_KILLER_PR
Note: This documentation may be incomplete and some information/aspects may be interpreted/understood wrong!
For a gamespy alternative for various games, visit: https://333networks.com/
Gamespy Gamename: swrcommando
Gamespy Gamekey: y2s8Fh
Gamespy Version: 0~3 (Hybrid) Plaintext and partial encrypted communication
The communication between Master Server and Game Server is completly in plaintext, however communication between Master Server and Game Client is partially encrypted. The data send from Game Client to Master Server is plaintext, however Game Client expectst the answer to be encrypted in EnctypeX algorithm!
Master Server <-> Game Server
The communication between Master Server and Game Server is in plaintext and only uses UDP protocol. Master Server listens on port 27900:
When a Game Server boots up for first time, it sends out 2 UDP packets to let Master Server know a new remote host is coming up. Master Server doesn't have to respond:
0x09 <packet ID>
0x00 <no use>
0x00 <no use>
0x00 <no use>
0x00 <no use>
0x73 s <gamespy gamename>
0x77 w
0x72 r
0x63 c
0x6f o
0x6d m
0x6d m
0x61 a
0x6e n
0x64 d
0x6f o
0x00 <null terminator>
Once Game Server is booted up and ready to accept connections, it sends all relevant game info to Master Server, essentially a \\status\\ packet every 30 seconds or so:
0x03 <packet ID>
0xd6 -- <Next 4 bytes are random ID generated by game server>
0x0c --
0x82 --
0xe0 --
0x6c l <localip0>
0x6f o
0x63 c
0x61 a
0x6c l
0x69 i
0x70 p
0x30 0
0x00 <null seperator>
0x31 1 <First local IP>
0x39 9
0x32 2
0x2e .
0x31 1
0x36 6
0x38 8
0x2e .
0x31 1
0x38 8
0x38 8
0x2e .
0x33 3
0x00 <null seperator>
0x6c l <localip1>
0x6f o
0x63 c
0x61 a
0x6c l
0x69 i
0x70 p
0x31 1
0x00 <null seperator>
0x31 1 <Second local IP>
0x39 9
0x32 2
0x2e .
0x31 1
0x36 6
0x38 8
0x2e .
0x32 2
0x30 0
0x33 3
0x2e .
0x31 1
0x00 <null seperator>
0x6c l <localip2>
0x6f o
0x63 c
0x61 a
0x6c l
0x69 i
0x70 p
0x32 2
0x00 <null seperator>
0x31 1 <Third local IP>
0x39 9
0x32 2
0x2e .
0x31 1
0x36 6
0x38 8
0x2e .
0x31 1
0x37 7
0x34 4
0x2e .
0x31 1
0x00 <null seperator>
0x6c l <localport>
0x6f o
0x63 c
0x61 a
0x6c l
0x70 p
0x6f o
0x72 r
0x74 t
0x00 <null seperator>
0x31 1 <query port of the game server, default 11138, every server instance increases number by 1 up to 11187 (x49)>
0x31 1
0x31 1
0x33 3
0x38 8
0x00 <null seperator>
0x6e n <NAT Negotiation>
0x61 a
0x74 t
0x6e n
0x65 e
0x67 g
0x00 <null seperator>
0x30 0 <0 = disabled>
0x00 <null seperator>
0x73 s <statechanged indicates when game server performs mapchange or shuts down, etc>
0x74 t
0x61 a
0x74 t
0x65 e
0x63 c
0x68 h
0x61 a
0x6e n
0x67 g
0x65 e
0x64 d
0x00 <null seperator>
0x33 3 <3 = ready to accept connections>
0x00 <null seperator>
0x67 g <gamespy gamename>
0x61 a
0x6d m
0x65 e
0x6e n
0x61 a
0x6d m
0x65 e
0x00 <null seperator>
0x73 s <swrcommando>
0x77 r
0x72 r
0x63 c
0x6f o
0x6d m
0x6d m
0x61 a
0x6e n
0x64 d
0x6f o
0x00 <null seperator>
0x68 h <server name displayed in browser>
0x6f o
0x73 s
0x74 t
0x6e n
0x61 a
0x6d m
0x65 e
0x00 <null seperator>
0x74 t <server name: test test>
0x65 e
0x73 s
0x74 t
0x20 (space)
0x74 t
0x65 e
0x73 s
0x74 t
0x00 <null seperator>
0x67 g <game version, republic commando only uses 2226>
0x61 a
0x6d m
0x65 e
0x76 v
0x65 e
0x72 r
0x00 <null seperator>
0x32 2
0x32 2
0x32 2
0x36 6
0x00 <null seperator>
0x68 h <hostport (connect port) of the game server, default: 7777>
0x6f o
0x73 s
0x74 t
0x70 p
0x6f o
0x72 r
0x74 t
0x00 <null seperator>
0x37 7 <default: 7777>
0x37 7
0x37 7
0x37 7
0x00 <null seperator>
0x6d m <mapname of server>
0x61 a
0x70 p
0x6e n
0x61 a
0x6d m
0x65 e
0x00 <null seperator>
0x4b K <english name: canyon>
0x41 A
0x4d M
0x50 P
0x46 F
0x53 S
0x43 C
0x48 H
0x49 I
0x46 F
0x46 F
0x00 <null seperator>
0x67 g <gametype of server>
0x61 a
0x6d m
0x65 e
0x74 t
0x79 y
0x70 p
0x65 e
0x00 <null seperator>
0x44 D <DM - deathmatch>
0x4d M
0x00 <null seperator>
0x6e n <amount of players on the server currently>
0x75 u
0x6d m
0x70 p
0x6c l
0x61 a
0x79 y
0x65 e
0x72 r
0x73 s
0x00 <null seperator>
0x30 0 <player ammount>
0x00 <null seperator>
0x6d m <max players capacity>
0x61 a
0x78 x
0x70 p
0x6c l
0x61 a
0x79 y
0x65 e
0x72 r
0x73 s
0x00 <null seperator>
0x38 8 <set to 8 maxplayers>
0x00 <null seperator>
0x67 g <state of current gamemode>
0x61 a
0x6d m
0x65 e
0x6d m
0x6f o
0x64 d
0x65 e
0x00 <null seperator>
0x6f o <set to openplaying, unknown if game actually uses this>
0x70 p
0x65 e
0x6e n
0x70 p
0x6c l
0x61 a
0x79 y
0x69 i
0x6e n
0x67 g
0x00 <null seperator>
0x6e n <number of teams>
0x75 u
0x6d m
0x74 t
0x65 e
0x61 a
0x6d m
0x73 s
0x00 <null seperator>
0x30 0 <set to 0 for deathmatch, may be set to 2 for teamdeathmatch/ctf/assault>
0x00 <null seperator>
0x66 f <goalscore>
0x72 r
0x61 a
0x67 g
0x6c l
0x69 i
0x6d m
0x69 i
0x74 t
0x00 <null seperator>
0x31 1 <set to 10>
0x30 0
0x00 <null seperator>
0x74 t <timelimit in minutes>
0x69 i
0x6d m
0x65 e
0x6c l
0x69 i
0x6d m
0x69 i
0x74 t
0x00 <null seperator>
0x36 6 <60 minutes>
0x30 0
0x00 <null seperator>
0x64 d <set whether server is in dedicated mode or not>
0x65 e
0x64 d
0x69 i
0x63 c
0x61 a
0x74 t
0x65 e
0x64 d
0x73 s
0x65 e
0x72 r
0x76 v
0x65 e
0x72 r
0x00 <null seperator>
0x31 1 <0 = off | 1 = on>
0x00 <null seperator>
0x66 f <friendlyfire %>
0x72 r
0x69 i
0x65 e
0x6e n
0x64 d
0x6c l
0x79 y
0x66 f
0x69 i
0x72 r
0x65 e
0x00 <null seperator>
0x30 0 <value between 0 and 100>
0x00 <null seperator>
0x00 <null seperator>
0x00 <null seperator>
0x00 <null seperator>
0x70 p <player_ : array for player names/ids>
0x6c l
0x61 a
0x79 y
0x65 e
0x72 r
0x5f _
0x00 <null seperator>
0x73 s <score_ : array for player scores>
0x63 c
0x6f o
0x72 r
0x65 e
0x5f _
0x00 <null seperator>
0x64 d <deaths_ : array for player deaths>
0x65 e
0x61 a
0x74 t
0x68 h
0x73 s
0x5f _
0x00 <null seperator>
0x70 p <ping_ : array for player pings>
0x69 i
0x6e n
0x67 g
0x5f _
0x00 <null seperator>
0x74 t <team_ : array for player pings>
0x65 e
0x61 a
0x6d m
0x5f _
0x00 <null seperator>
0x00 <null seperator>
0x00 <null seperator>
0x00 <null seperator>
0x74 t <team_t : array for player team (trandoshan team), unknown if it gets used>
0x65 e
0x61 a
0x6d m
0x5f _
0x74 t
0x00 <null seperator>
0x73 s <score_t : array for player score (trandoshan team), unknown if it gets used>
0x63 c
0x6f o
0x72 r
0x65 e
0x5f _
0x74 t
0x00 <null seperator>
0x00 <end of packet indicator>
Master Server acknowledges the information and sends ack response back to Game Server:
0xfe <?? gamespy internal stuff>
0xfd <?? gamespy internal stuff>
0x03 <packet ID>
0xd6 -- <Next 4 bytes are random ID generated by game server>
0x0c --
0x82 --
0xe0 --
0x00 <end of packet indicator>
Finally, Game Server sends a heartbeat to Master Server every 10 seconds or so:
0x08 <packet ID>
0xd6 -- <Next 4 bytes are random ID generated by game server>
0x0c --
0x82 --
0xe0 --
Master Server sends heartbeat back to Game Server:
0xfe <?? gamespy internal stuff>
0xfd <?? gamespy internal stuff>
0x08 <packet ID>
0xd6 -- <Next 4 bytes are random ID generated by game server>
0x0c --
0x82 --
0xe0 --
0x00 <end of packet indicator>Master Server <-> Client
The communication between Client and Master Server starts with UDP but then gets shifted to TCP with encryption/algorithm.
Master Server is listening on port 27900 with UDP and Client sends request:
0x09 <message type : 9 = client starting query>
0x00 -- <Next 4 bytes are random ID generated by client, but it doesnt get used for now, so its left blank>
0x00 --
0x00 --
0x00 --
0x73 s <gamespy gamename>
0x77 w
0x72 r
0x63 c
0x6f o
0x6d m
0x6d m
0x61 a
0x6e n
0x64 d
0x6f o
0x00 <end of packet indicator>
From there, Master Server knows Client will start a TCP connection now to query server list. Master Server needs to listen on port 28910 now:
0x00 <?? unknown>
0xa2 <?? unknown>
0x00 <?? unknown>
0x01 <?? unknown>
0x03 <?? unknown>
0x00 -- <Next 4 bytes are random ID generated by client, but it doesnt get used for now, so its left blank>
0x00 --
0x00 --
0x00 --
0x73 s <gamespy gamename>
0x77 w
0x72 r
0x63 c
0x6f o
0x6d m
0x6d m
0x61 a
0x6e n
0x64 d
0x6f o
0x00 <null seperator>
0x73 s <gamespy gamename>
0x77 w
0x72 r
0x63 c
0x6f o
0x6d m
0x6d m
0x61 a
0x6e n
0x64 d
0x6f o
0x00 <null seperator>
0x70 -- <Next 8 bytes are the validation key created by client. It gets used to encrypt the message from Master Server>
0x57 --
0x63 --
0x38 --
0x5b --
0x56 --
0x7b --
0x5d --
0x00 <null seperator>
0x5c \ <backslash as seperator>
0x68 h <hostname>
0x6f o
0x73 s
0x74 t
0x6e n
0x61 a
0x6d m
0x65 e
0x5c \ <backslash as seperator>
0x68 h <hostport>
0x6f o
0x73 s
0x74 t
0x70 p
0x6f o
0x72 r
0x74 t
0x5c \ <backslash as seperator>
0x6e n <numplayers>
0x75 u
0x6d m
0x70 p
0x6c l
0x61 a
0x79 y
0x65 e
0x72 r
0x73 s
0x5c \ <backslash as seperator>
0x6d m <maxplayers>
0x61 a
0x78 x
0x70 p
0x6c l
0x61 a
0x79 y
0x65 e
0x72 r
0x73 s
0x5c \ <backslash as seperator>
0x6d m <mapname>
0x61 a
0x70 p
0x6e n
0x61 a
0x6d m
0x65 e
0x5c \ <backslash as seperator>
0x67 g <gametype>
0x61 a
0x6d m
0x65 e
0x74 t
0x79 y
0x70 p
0x65 e
0x5c \ <backslash as seperator>
0x66 f <fraglimit>
0x72 r
0x61 a
0x67 g
0x6c l
0x69 i
0x6d m
0x69 i
0x74 t
0x5c \ <backslash as seperator>
0x74 t <timelimit>
0x69 i
0x6d m
0x65 e
0x6c l
0x69 i
0x6d m
0x69 i
0x74 t
0x5c \ <backslash as seperator>
0x6e n <numteams>
0x75 u
0x6d m
0x74 t
0x65 e
0x61 a
0x6d m
0x73 s
0x5c \ <backslash as seperator>
0x64 d <dedicatedserver>
0x65 e
0x64 d
0x69 i
0x63 c
0x61 a
0x74 t
0x65 e
0x64 d
0x73 s
0x65 e
0x72 r
0x76 v
0x65 e
0x72 r
0x5c \ <backslash as seperator>
0x66 f <friendlyfire>
0x72 r
0x69 i
0x65 e
0x6e n
0x64 d
0x6c l
0x79 y
0x66 f
0x69 i
0x72 r
0x65 e
Now Master Server needs to fetch the necessary data and send it back to the client. This is the first time the message gets encrypted by the gamespy EnctypeX algorithm.
This is the plain text message before encryption!!!
0xe6 <message type>
0x00 <null seperator>
0x00 <null seperator>
0x4c <?? unknown>
0xd4 <?? unknown>
0xaa <?? unknown>
0x4e <?? unknown>
0x05 <?? unknown>
0x90 <?? unknown>
0x19 <?? unknown>
0x2f <?? unknown>
0xf3 <?? unknown>
0x39 <?? unknown>
0xad <?? unknown>
0x12 <?? unknown>
0xff <?? unknown>
0x41 <?? unknown>
0xad <?? unknown>
0x57 <?? unknown>
0xf1 <?? unknown>
0xf2 <?? unknown>
0x63 <?? unknown>
0x20 <?? unknown>
0xa0 <?? unknown>
0x20 <?? unknown>
0x13 <?? unknown>
0xcb <?? unknown>
0x86 <?? unknown>
0xb5 <?? unknown>
0xf5 <?? unknown>
0x04 <?? unknown>
0xac <?? unknown>
0x05 <?? unknown>
0xf2 <?? unknown>
0x8a <?? unknown>
0x5e <?? unknown>
0xec <?? unknown>
0xff <Client IP Address : For example: (255.255.255.255)>
0xff
0xff
0xff
0x6c <Client destination port : 27900>
0xfc
0x00 <?? unknown>
0x00 <?? unknown>
0x7e <?? unknown>
0xa4 <Game Server IP (164.132.196.125)>
0x84
0xc4
0x7d
0x2b <query port of Game Server : 11138>
0x82
0xa4 <Game Server IP (164.132.196.125)>
0x84
0xc4
0x7d
0x2b <query port of Game Server : 11138>
0x82
0xa4 <Game Server IP (164.132.196.125)>
0x84
0xc4
0x7d
0x00 <end of packet indicator>
0xff
0xff
0xff
0xff
Once the Client got the server list from Master Server, it will query additional information for the servers like players, map, etc:
0x00 <5x null, one of them is the server ID to fetch data, the rest IDK>
0x00
0x00
0x00
0x00
0x00 -- <Next 4 bytes are random ID generated by client, but it doesnt get used for now, so its left blank>
0x00 --
0x00 --
0x00 --
0x73 s <gamespy gamename>
0x77 w
0x72 r
0x63 c
0x6f o
0x6d m
0x6d m
0x61 a
0x6e n
0x64 d
0x6f o
0x00 <null seperator>
0x73 s <gamespy gamename>
0x77 w
0x72 r
0x63 c
0x6f o
0x6d m
0x6d m
0x61 a
0x6e n
0x64 d
0x6f o
0x00 <null seperator>
0x5c \ <backslash as seperator>
0x68 h <hostname>
0x6f o
0x73 s
0x74 t
0x6e n
0x61 a
0x6d m
0x65 e
0x5c \ <backslash as seperator>
0x68 h <hostport>
0x6f o
0x73 s
0x74 t
0x70 p
0x6f o
0x72 r
0x74 t
0x5c \ <backslash as seperator>
0x6e n <numplayers>
0x75 u
0x6d m
0x70 p
0x6c l
0x61 a
0x79 y
0x65 e
0x72 r
0x73 s
0x5c \ <backslash as seperator>
0x6d m <maxplayers>
0x61 a
0x78 x
0x70 p
0x6c l
0x61 a
0x79 y
0x65 e
0x72 r
0x73 s
0x5c \ <backslash as seperator>
0x6d m <mapname>
0x61 a
0x70 p
0x6e n
0x61 a
0x6d m
0x65 e
0x5c \ <backslash as seperator>
0x67 g <gametype>
0x61 a
0x6d m
0x65 e
0x74 t
0x79 y
0x70 p
0x65 e
0x5c \ <backslash as seperator>
0x66 f <fraglimit>
0x72 r
0x61 a
0x67 g
0x6c l
0x69 i
0x6d m
0x69 i
0x74 t
0x5c \ <backslash as seperator>
0x74 t <timelimit>
0x69 i
0x6d m
0x65 e
0x6c l
0x69 i
0x6d m
0x69 i
0x74 t
0x5c \ <backslash as seperator>
0x6e n <numteams>
0x75 u
0x6d m
0x74 t
0x65 e
0x61 a
0x6d m
0x73 s
0x5c \ <backslash as seperator>
0x64 d <dedicatedserver>
0x65 e
0x64 d
0x69 i
0x63 c
0x61 a
0x74 t
0x65 e
0x64 d
0x73 s
0x65 e
0x72 r
0x76 v
0x65 e
0x72 r
0x5c \ <backslash as seperator>
0x66 f <friendlyfire>
0x72 r
0x69 i
0x65 e
0x6e n
0x64 d
0x6c l
0x79 y
0x66 f
0x69 i
0x72 r
0x65 e
Master Server needs to fetch data for this server ID and send it back with EnctypeX encryption.
Response in plain text before encrypting:
0x5d <?? unknown>
0xcd <?? unknown>
0xf1 <?? unknown>
0x81 <?? unknown>
0x6c <?? unknown>
0xfc <?? unknown>
0x0b <?? unknown>
0x00 <null seperator>
0x68 h <hostname>
0x6f o
0x73 s
0x74 t
0x6e n
0x61 a
0x6d m
0x65 e
0x00 <null seperator>
0x00 <null seperator>
0x68 h <hostport>
0x6f o
0x73 s
0x74 t
0x70 p
0x6f o
0x72 r
0x74 t
0x00 <null seperator>
0x00 <null seperator>
0x6e n <numplayers>
0x75 u
0x6d m
0x70 p
0x6c l
0x61 a
0x79 y
0x65 e
0x72 r
0x73 s
0x00 <null seperator>
0x00 <null seperator>
0x6d m <maxplayers>
0x61 a
0x78 x
0x70 p
0x6c l
0x61 a
0x79 y
0x65 e
0x72 r
0x73 s
0x00 <null seperator>
0x00 <null seperator>
0x6d m <mapname>
0x61 a
0x70 p
0x6e n
0x61 a
0x6d m
0x65 e
0x00 <null seperator>
0x00 <null seperator>
0x67 g <gametype>
0x61 a
0x6d m
0x65 e
0x74 t
0x79 y
0x70 p
0x65 e
0x00 <null seperator>
0x00 <null seperator>
0x66 f <fraglimit>
0x72 r
0x61 a
0x67 g
0x6c l
0x69 i
0x6d m
0x69 i
0x74 t
0x00 <null seperator>
0x00 <null seperator>
0x74 t <timelimit>
0x69 i
0x6d m
0x65 e
0x6c l
0x69 i
0x6d m
0x69 i
0x74 t
0x00 <null seperator>
0x00 <null seperator>
0x6e n <numteams>
0x75 u
0x6d m
0x74 t
0x65 e
0x61 a
0x6d m
0x73 s
0x00 <null seperator>
0x00 <null seperator>
0x64 d <dedicatedserver>
0x65 e
0x64 d
0x69 i
0x63 c
0x61 a
0x74 t
0x65 e
0x64 d
0x73 s
0x65 e
0x72 r
0x76 v
0x65 e
0x72 r
0x00 <null seperator>
0x00 <null seperator>
0x66 f <friendlyfire>
0x72 r
0x69 i
0x65 e
0x6e n
0x64 d
0x6c l
0x79 y
0x66 f
0x69 i
0x72 r
0x65 e
0x00 <null seperator>
0x00 <null seperator>
0x7e <?? unknwon>
0xa4 164 <IP of Gameserver : 164.132.196.125>
0x84 132 ---^
0xc4 196 --^
0x7d 125 -^
0x2b 11138 <Query port of game server (2 bytes) : 11138>
0x82 -^
0xa4 164 <IP of Gameserver : 164.132.196.125>
0x84 132 ---^
0xc4 196 --^
0x7d 125 -^
0x2b 11138 <Query port of game server (2 bytes) : 11138>
0x82 -^
0xa4 164 <IP of Gameserver : 164.132.196.125>
0x84 132 ---^
0xc4 196 --^
0x7d 125 -^
0xff <value seperator>
0x44 D <hostname : DM - swrc-modding.net>
0x4d M
0x20 <space>
0x2d -
0x20 <space>
0x73 s
0x77 w
0x72 r
0x63 c
0x2d -
0x6d m
0x6f o
0x64 d
0x64 d
0x69 i
0x6e n
0x67 g
0x2e .
0x6e n
0x65 e
0x74 t
0x00 <value seperator>
0xff <value seperator>
0x37 7 <hostport : 7777>
0x37 7
0x37 7
0x37 7
0x00 <value seperator>
0xff <value seperator>
0x30 0 <numplayers : 0>
0x00 <value seperator>
0xff <value seperator>
0x33 3 <maxplayers: 32>
0x32 2
0x00 <value seperator>
0xff <value seperator>
0x47 G <mapname : GARTEN : DM_HangingGarden>
0x41 A
0x52 R
0x54 T
0x45 E
0x4e N
0x00 <value seperator>
0xff <value seperator>
0x44 D <gametype : DM>
0x4d M
0x00 <value seperator>
0xff <value seperator>
0x32 2 <fraglimit : 25>
0x35 5
0x00 <value seperator>
0xff <value seperator>
0x33 3 <timelimit : 30>
0x30 0
0x00 <value seperator>
0xff <value seperator>
0x30 0 <numteams : 0>
0x00 <value seperator>
0xff <value seperator>
0x31 1 <dedicatedserver : 1 = on>
0x00 <value seperator>
0xff <value seperator>
0x30 0 <friendlyfire : 0>
0x00 <end of data indicator>
0x00 <end of data indicator>
0xff <end of data indicator>
0xff <end of data indicator>
0xff <end of data indicator>
0xff <end of data indicator>
0x64 <?? unknown>
0xba <?? unknown>
0x67 <?? unknown>
0x71 <?? unknown>
0x74 <?? unknown>
0x5a <?? unknown>
0x7e <?? unknown>
0xea <?? unknown>
0x94 <?? unknown>
0xc8 <?? unknown>
0xe6 <?? unknown>
0xa5 <?? unknown>
0xa9 <?? unknown>
0xe8 <?? unknown>
0x9d <?? unknown>
0x44 <?? unknown>
0xf4 <?? unknown>
0x03 <?? unknown>
0x78 <?? unknown>
0x54 <?? unknown>
0x9b <?? unknown>
0x86 <?? unknown>
0xf4 <?? unknown>
0x5e <?? unknown>
0x52 <?? unknown>
0xb5 <?? unknown>
0x2a <?? unknown>
0x91 <?? unknown>
0xc3 <?? unknown>
0x7a <?? unknown>
0x7e <?? unknown>
0xfe <?? unknown>
0xb0 <?? unknown>
0x3e <?? unknown>
0x88 <?? unknown>
0xd6 <?? unknown>
0xca <?? unknown>
The actual player data of the gameservers is missing and needs to be reversed, but for now server list shows the gameservers.