public void Query(string[] metaservers = null)
{
l.Info("[META] Querying metaservers.");
if (metaservers == null)
{
metaservers = DefaultMetaservers;
}
foreach (var metaserver in DefaultMetaservers)
{
IPHostEntry host = Dns.GetHostEntry(metaserver);
if (host == null)
{
l.Error("Host DNS lookup failed for metaserver: " + metaserver);
continue;
}
Socket socket = null;
try
{
try
{
socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.IP);
socket.Connect(host.AddressList, NetConstants.MetaserverPort);
}
catch (Exception ex)
{
l.Warn("Failed to connect to: " + host.HostName + ". Exception: " + ex.ToString());
continue;
}
if (!socket.Connected)
{
socket.Dispose();
continue;
}
byte[] sendBytes = ASCIIEncoding.ASCII.GetBytes("?version=_");
try
{
socket.Send(sendBytes);
}
catch (Exception ex)
{
l.Warn("Error sending to metaserver '" + metaserver + "': " + ex.ToString());
continue;
}
int packetsReceived = 0;
receive:
if (packetsReceived > 1) l.Trace("packetsReceived > 1");
byte[] recvBuffer = new byte[8192];
int bytesRead = 0;
try
{
if (packetsReceived == 0 || socket.Poll(250, SelectMode.SelectRead))
{
socket.ReceiveTimeout = 5000; // HARDTIME TIMEOUT
bytesRead = socket.Receive(recvBuffer);
}
}
catch (Exception ex)
{
l.Warn("Error receiving from metaserver: " + ex.ToString());
continue;
}
if (bytesRead == 0)
{
if (packetsReceived == 0)
{
l.Warn("Received nothing from metaserver'" + metaserver + "'");
}
continue;
}
packetsReceived++;
string result = ASCIIEncoding.ASCII.GetString(recvBuffer);
string[] lines = result.Split(new char[] { '\n' }, StringSplitOptions.RemoveEmptyEntries);
int lineCount = 0;
string protocolType = null;
string protocolUnknown2;
foreach (var line in lines)
{
if (line.StartsWith(((char)0).ToString())) break;
string[] cells = line.Split(',');
if (lineCount++ == 0)
{
protocolType = cells[0];
if (protocolType.Equals("r"))
{
protocolUnknown2 = cells[1];
}
continue;
}
ServerListing listing = null;
if (protocolType.Equals("r"))
{
listing = new ServerListing(cells[0]);
listing.Source = protocolType;
listing.Port = Convert.ToInt32(cells[1]);
listing.Status = cells[2];
listing.Age = Convert.ToInt32(cells[3]);
listing.Players = Convert.ToInt32(cells[4]);
listing.Queue = Convert.ToInt32(cells[5]);
listing.Type = cells[6];
listing.Comment = String.Empty;
}
else if (protocolType.Equals("s"))
{
listing = new ServerListing(cells[0]);
listing.Source = protocolType;
listing.Type = cells[1];
listing.Comment = cells[2];
listing.Port = Convert.ToInt32(cells[4]);
listing.Players = Convert.ToInt32(cells[5]);
listing.Queue = Convert.ToInt32(cells[6].Trim());
listing.Status = "2"; // TODO REVIEW
if (listing.Type.Equals("unknown")) listing.Status = "3"; // TODO REVIEW
listing.Age = 0;
}
else
{
l.Warn("Unknown metaserver protocol: " + protocolType);
}
if (listing != null && listing.IsSupported)
{
l.Debug("[meta] " + listing.ToString());
if (ServerListings.Contains(listing))
{
ServerListings.Remove(listing);
}
ServerListings.Add(listing);
servers.Set(listing.Key, listing);
}
}
goto receive;
}
finally
{
try
{
if (socket != null)
{
socket.Dispose();
socket = null;
}
}
catch (Exception ex) { l.Trace(ex.ToString()); }
}
}
}
