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发表于 2009-4-7 09:05:45
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Server QueriesThe Source engine allows you to query information from a running game server using UDP/IP packets. This document describes the packet formats and protocol to access this data.
Basic Data Types
All server queries consist of 5 basic types of data packed together into a data stream. All types are little endian.
Name
Description
byte
8 bit character
short
16 bit signed integer
long
32 bit signed integer
float
32 bit float value
string
variable length byte field, terminated by 0x00
Query Types
The server responds to 4 queries:
•A2S_SERVERQUERY_GETCHALLENGE - Returns a challenge number for use in the player and rules query.
•A2S_INFO - Basic information about the server.
•A2S_PLAYER - Details about each player on the server.
•A2S_RULES - The rules the server is using.
Queries should be sent in UDP packets to the listen port of the server, which is typically port 27015.
A2S_SERVERQUERY_GETCHALLENGE
Request format
Challenge values are required for A2S_PLAYER and A2S_RULES requests, you can use this request to get one.
Note: You can also send A2S_PLAYER and A2S_RULES queries with a challenge value of -1 (0xFF FF FF FF FF FF FF FF) and they will respond with a challenge value to use (using the reply format below).
FF FF FF FF 57
Reply format
Data
Type
Comment
Type
byte
Should be equal to 'A' (0x41)
Challenge
long
The challenge number to use
Example reply:
FF FF FF FF FF 41 32 42 59 45 53 93 43 71
A2S_INFO
Request format
Server info can be requested by sending the following byte values in a UDP packet to the server.
FF FF FF FF 54 53 6F 75 72 63 65 20 45 6E 67 69 6E 65 20 51 75 65 72 79 00
Reply format (Source)
Data
Type
Comment
Type
byte
Should be equal to 'I' (0x49)
Version
byte
Network version
Hostname
string
The Servers name
Map
string
The current map being played
Game Directory
string
The Game type
Game Description
string
A friendly string name for the game type
AppID
short
Steam Application number (currently always set to 0)
Num players
byte
The number of players currently on the server
Max players
byte
Maximum allowed players for the server
Num of bots
byte
Number of bot players currently on the server
Dedicated
byte
Set to 1 for dedicated servers
OS
byte
'l' for Linux, 'w' for Windows
Password
byte
If set to 1 a password is required to join this server
Secure
byte
If set to 1 this server is running VAC
Game Version
string
The version of the game
Example reply:
FF FF FF FF 49 02 67 61 6D 65 32 78 73 2E 63 6F ....I.game2xs.co
6D 20 43 6F 75 6E 74 65 72 2D 53 74 72 69 6B 65 m.Counter-Strike
20 53 6F 75 72 63 65 20 23 31 00 64 65 5F 64 75 .Source.#1.de_du
73 74 00 63 73 74 72 69 6B 65 00 43 6F 75 6E 74 st.cstrike.Count
65 72 2D 53 74 72 69 6B 65 00 00 00 0B 28 00 64 er-Strike....(.d
6C 00 00 31 2e 31 2e 30 2e 31 36 00 l..1.1.0.16
Reply format (HL1)
Data
Type
Comment
Type
byte
Should be equal to 'm' (0x6D)
Game IP
string
Game Server IP address and port
Hostname
string
The Servers name
Map
string
The current map being played
Game Directory
string
The Game type
Game Description
string
A friendly string name for the game type
Num players
byte
The number of players currently on the server
Max players
byte
Maximum allowed players for the server
Version
byte
Network version
Dedicated
byte
Set to 'd' for dedicated servers, 'l' for listen
OS
byte
'l' for Linux, 'w' for Windows
Password
byte
If set to 1 a password is required to join this server
IsMod
byte
If set to 1 this packet has a mod details section, 0 otherwise
URLInfo
string
(MOD Detail Only) URL containing information about this mod
URLDL
string
(MOD Detail Only) URL to download this mod
Unused
string
(MOD Detail Only) Will always be an empty string
ModVersion
long
(MOD Detail Only) Version of the installed mod
ModSize
long
(MOD Detail Only) The download size of this mod
SvOnly
byte
(MOD Detail Only) If 1 this is a server side only mod
ClDLL
byte
(MOD Detail Only) If 1 this mod has a custom client dll
Secure
byte
If set to 1 this server is running VAC
Num of bots
byte
Number of bot players currently on the server
A2S_PLAYER
Request format
FF FF FF FF 55 <4 byte challenge number>
The challenge number can either be set to -1 (0xFF FF FF FF FF FF FF FF) to have the server reply with S2C_CHALLENGE, or use the value from a previous A2S_SERVERQUERY_GETCHALLENGE request.
Reply format
The players response has two sections, the initial header:
Data
Type
Comment
Type
byte
Should be equal to 'D' (0x44)
Num Players
byte
The number of players reported in this response
Then for each player the following fields are sent:
Data
Type
Comment
Index
byte
The index into [0.. Num Players] for this entry
Player Name
string
Player's name
Kills
long
Number of kills this player has
Time connected
float
The time in seconds this player has been connected
A2S_RULES
Request format
FF FF FF FF 56 <4 byte challenge number>
The challenge number can either be set to -1 (0xFF FF FF FF FF FF FF FF) to have the server reply with S2C_CHALLENGE, or use the value from a previous A2S_SERVERQUERY_GETCHALLENGE request.
Reply format
The rules response has two sections, the initial header:
Data
Type
Comment
Type
byte
Should be equal to 'E' (0x45)
Num Rules
short
The number of rules reported in this response
Then for each rule the following fields are sent:
Data
Type
Comment
Rule Name
string
The name of the rule
Rule Value
string
The rules value
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