private void RefreshThread()
{
using (TimedUdpClient client = new TimedUdpClient())
{
IPEndPoint ipEndPoint = new IPEndPoint(IPAddress.Any, 0);
try
{
DateTime connectTime = DateTime.Now;
Players.Clear();
//add default 27015 port if not present
if(address.IndexOf(':') == -1)
address += ":27015";
// attempt to connect
Int32 colonIndex = address.IndexOf(':');
// what's the timeout???
client.Connect(address.Remove(colonIndex), Convert.ToInt32(address.Substring(colonIndex + 1)));
if (abortRefresh)
{
Common.AbortThread(Thread);
}
// send A2S_INFO
// -1 (int), A2S_INFO, "Source Engine Query" (string)
DateTime sendTime = DateTime.Now;
client.Send(new Byte[] { 0xFF, 0xFF, 0xFF, 0xFF, A2S_INFO, 0x53, 0x6F, 0x75, 0x72, 0x63, 0x65, 0x20, 0x45, 0x6E, 0x67, 0x69, 0x6E, 0x65, 0x20, 0x51, 0x75, 0x65, 0x72, 0x79, 0x00 });
// receive A2S_INFO reply
Byte[] infoReply = client.Receive(ref ipEndPoint);
if (infoReply == null)
{
title = "Server not responding";
}
// calculate ping
TimeSpan ping = DateTime.Now - connectTime;
// parse A2S_INFO reply
ParseInfoQueryReply(infoReply);
if (client.Available > 0)
{
client.Receive(ref ipEndPoint);
}
//Int32 challengeNumber = ParseServerQueryGetChallengeReply(serverQueryGetChallengeReply);
Int32 challengeNumber = -1;
while (true)
{
if (abortRefresh)
{
Common.AbortThread(Thread);
}
// send A2S_PLAYER
BitWriter bitWriter = new BitWriter();
bitWriter.WriteInt32(-1);
bitWriter.WriteByte(A2S_PLAYER);
bitWriter.WriteInt32(challengeNumber);
client.Send(bitWriter.Data);
// receive and parse A2S_PLAYER reply
Byte[] playerReply = client.Receive(ref ipEndPoint);
if (playerReply == null)
{
if (challengeNumber != -1)
{
// oh, it's a sourcetv server
break;
}
title = "Player query failed";
}
// check for a challenge number (source servers)
BitBuffer bitBuffer = new BitBuffer(playerReply);
if (bitBuffer.ReadInt32() != -1)
{
title = "Bad A2S_PLAYER reply";
}
Byte type = bitBuffer.ReadByte();
if (type == S2C_CHALLENGE)
{
challengeNumber = bitBuffer.ReadInt32();
continue;
}
else if (type == S2C_PLAYER)
{
ParsePlayerQueryReply(bitBuffer);
}
else if (type == S2C_INFO_SOURCE)
{
ParsePlayerQueryReply(bitBuffer);
}
else
{
title = (String.Format("Bad A2S_PLAYER type: {0}", type));
}
break;
}
}
catch (ThreadAbortException)
{
throw;
}
finally
{
client.Close();
}
}
}
/// <summary>
/// Parses S2C_PLAYER.
/// </summary>
/// <param name="data"></param>
/// <param name="si"></param>
private void ParsePlayerQueryReply(BitBuffer bitBuffer)
{
Int32 nPlayers = bitBuffer.ReadByte();
for (Int32 i = 0; i < nPlayers; i++)
{
bitBuffer.SeekBytes(1); // skip index
Player player = new Player();
player.Name = bitBuffer.ReadString();
player.Score = bitBuffer.ReadInt32();
Single time = bitBuffer.ReadSingle();
player.Time = (time == -1 ? "BOT" : Common.DurationString(time));
players.Add(player);
}
}
/// <summary>
/// Parses S2C_CHALLENGE and returns the challenge number.
/// </summary>
/// <param name="data"></param>
/// <returns></returns>
private Int32 ParseServerQueryGetChallengeReply(Byte[] data)
{
BitBuffer bitBuffer = new BitBuffer(data);
if (bitBuffer.ReadInt32() != -1)
{
throw new ApplicationException("Bad A2S_SERVERQUERY_GETCHALLENGE reply");
}
Byte type = bitBuffer.ReadByte();
if (type != S2C_CHALLENGE)
{
throw new ApplicationException(String.Format("Bad A2S_SERVERQUERY_GETCHALLENGE type: {0}", type));
}
return bitBuffer.ReadInt32();
}
/// <summary>
/// Parses S2C_INFO.
/// </summary>
/// <param name="data"></param>
/// <param name="si"></param>
private void ParseInfoQueryReply(Byte[] data)
{
BitBuffer bitBuffer = new BitBuffer(data);
if (bitBuffer.ReadInt32() != -1)
{
throw new ApplicationException("Bad A2S_INFO reply");
}
// read reply type
Byte type = bitBuffer.ReadByte();
Boolean sourceEngine;
if (type == S2C_INFO_SOURCE)
{
sourceEngine = true;
}
else if (type == S2C_INFO_GOLDSRC)
{
sourceEngine = false;
}
else
{
throw new ApplicationException(String.Format("Bad A2S_INFO type: {0}", type));
}
// read the rest
if (!sourceEngine)
{
bitBuffer.ReadString();
//si.Address = bitBuffer.ReadString(); // resolved hostname
}
else
{
bitBuffer.SeekBytes(1); // network version
}
title = bitBuffer.ReadString();
map = bitBuffer.ReadString(); // map
if (sourceEngine)
{
bitBuffer.SeekBytes(2); // app id
}
bitBuffer.SeekBytes(1); // goldsrc: network version, source: num bots
bitBuffer.SeekBytes(1); // dedicated
bitBuffer.SeekBytes(1); // os
}
