A2S

Powerful command-line utility and Go packages for querying Steam A2S server information. Built with specific support for Arma 3 and DayZ, this tool provides a seamless way to retrieve essential server data.

Description

A2S supports querying Steam servers using the following methods:

• A2S_INFO: Retrieve basic information about the server, such as name, map, and player count. (CLI and package)
• A2S_PLAYER: Get details about each player currently on the server. (CLI and package)
• A2S_RULES: Fetch server-specific rules and settings. (CLI and package)
• A2S_SERVERQUERY_GETCHALLENGE: Request a challenge number for use in player and rules queries. (only package)
• A2A_PING: Measure the ping time to the server for latency insights. (only package)

Additionally, this tool features an extension for the Arma 3 Server Browser Protocol (A3SBP). This extension overrides the standard GetRules() method, enabling compatibility with the unique protocol used by Arma 3's server browser.

CLI Installation

You can download the latest version of the programme by following the links:

	MacOS	Linux	Windows
AMD64	a2s-darwin-amd64	a2s-linux-amd64	a2s-windows-amd64
ARM64	a2s-darwin-arm64	a2s-linux-arm64	a2s-windows-arm64

You can also use the command (for Linux amd64, adjust for your platform):

curl -#SfLo /usr/bin/a2s \
  https://github.com/WoozyMasta/a2s/releases/latest/download/a2s-linux-amd64
chmod +x /usr/bin/a2s
a2s -h && a2s -v

A2S CLI

Command-line utility for querying Steam A2S server information with support for Arma 3 and DayZ servers.

The utility supports the following commands:

• info - Retrieve server information A2S_INFO
• rules - Retrieve server rules A2S_RULES
• players - Retrieve player list A2S_PLAYERS
• all - Retrieve all available server information
• ping - Ping the server with A2S_INFO

For detailed information about available options and flags, run a2s --help.

Package

A2S

Example of use:

client, err := a2s.New("127.0.0.1", 27016)
if err != nil {
  panic(err)
}
defer client.Close()

client.SetBufferSize(2048)
client.SetDeadlineTimeout(3)

info, err := client.GetInfo()
if err != nil {
  panic(err)
}

rules, err := client.GetRules()
if err != nil {
  panic(err)
}

• github.com/woozymasta/a2s.GetInfo() -> A2S_INFO
• github.com/woozymasta/a2s.GetPlayers() -> A2S_PLAYER
• github.com/woozymasta/a2s.GetRules() -> A2S_RULES
• github.com/woozymasta/a2s.GetChallenge() -> A2S_SERVERQUERY_GETCHALLENGE
• github.com/woozymasta/a2s.GetPing() -> A2A_PING

A3SB

Example of use:

client, err := a2s.New("127.0.0.1", 27016)
if err != nil {
  panic(err)
}
defer client.Close()

// Wrap client
a3Client := &a3sb.Client{Client: client}

// Game id must be passed as the second argument to properly read the Arma 3 or Dayz rules
rules, err := a3Client.GetRules(221100)
if err != nil {
  panic(err)
}

// Can also perform standard a2s methods
info, err := a3Client.GetInfo()
if err != nil {
  panic(err)
}

Protocol Documentation

For a deeper understanding of the protocols used, refer to the official documentation:

• Steam Server Queries
• Arma 3 Server Browser Protocol v3
• A3SB Protocol v3 Specification 🇬🇧
• A3SB Protocol v3 Specification 🇷🇺

Tested Games

During development, the functionality of a2s was thoroughly tested across a diverse range of popular games that utilize the Steam server query protocols. This ensures compatibility and reliable performance.

The following games were used for testing:

• Counter-Strike 1.6
• Counter-Strike: Source
• Team Fortress 2
• Project Zomboid
• Valheim
• Rust
• Garry's Mod
• Insurgency
• Arma 3
• DayZ
• 7 Days to Die
• ARK: Survival Evolved
• Conan Exiles
• Unturned

These games represent a wide array of server types and implementations, highlighting the versatility of the tools in querying servers effectively across various scenarios.

Feel free to contribute or report issues if you find any compatibility problems with additional games!

Note

Implementation of bzip2 compression for multi-packet response is not implemented, as I did not find any servers that would respond in this format. If you know of one, please write me in issue.

👉 Support Me

Your support is greatly appreciated!