wedtm · February 25, 2012 04:35 · Feb 25, 2012
diff --git a/gistfile1.rb b/gistfile1.rb
@@ -0,0 +1,78 @@
+#
+# Tested on 1.9.2-p290, Written by Miles Smith (WedTM)
+#
+
+require 'socket'
+
+class MCQuery
+  MAGIC_PREFIX = "\xFE\xFD"
+  PACKET_TYPE_CHALLENGE = "\x09"
+  PACKET_TYPE_QUERY = "\x00"
+  ID = "\x00\x00\x00\x00"
+  DEFAULTS = {
+    host: "localhost",
+    port: 25565,
+  }
+
+  def initialize(opts = {})
+    @opts = DEFAULTS.merge! opts
+    @socket = UDPSocket.new
+    @socket.connect(@opts[:host], @opts[:port])
+  end
+
+  def start
+    @socket.send(MAGIC_PREFIX + PACKET_TYPE_CHALLENGE + ID, 0)
+    t = @socket.recvfrom(1460)[0]
+    key = t[5...-1].to_i
+    @key = Array(key).pack('N')
+  end
+
+  def simple
+    start
+    query = @socket.send(MAGIC_PREFIX + PACKET_TYPE_QUERY + ID + @key, 0)
+    data = @socket.recvfrom(1460)[0]
+    buffer = data[5...-1]
+    val = {}
+    val[:motd], val[:gametype], val[:map], val[:numplayers], val[:maxplayers], buf = buffer.split("\x00", 6)
+    val
+  end
+
+  def full
+    start
+    query = @socket.send(MAGIC_PREFIX + PACKET_TYPE_QUERY + ID + @key + ID, 0)
+    data = @socket.recvfrom(1460)[0]
+    buffer = data[11...-1]
+    items, players = buffer.split("\x00\x00\x01player_\x00\x00")
+    if items[0...8] == 'hostname'
+      items = 'motd' + items[8...-1]
+    end
+    vals = {}
+    items = items.split("\x00")
+    items.each_with_index do |key, idx|
+      next unless idx % 2 == 0
+      vals[key] = items[idx + 1]
+    end
+
+    vals["motd"] = vals["hostname"]
+    vals.delete("hostname")
+    vals.delete("um") if vals["um"]
+
+    players = players[0..-2]
+
+    if players
+      vals[:players] = players.split("\x00")
+    end
+    puts vals
+    vals["raw_plugins"] = vals["plugins"]
+    parts = vals["raw_plugins"].split(":")
+    server = parts[0].strip()
+    plugins = []
+    if parts.size == 2
+      plugins = parts[1].split(";").map {|value| value.strip() }
+    end
+    vals["plugins"] = plugins
+    vals["server"] = server
+
+    vals
+  end
+end