private void Client_MessageReceived(RconClient sender, RconPacket packet)
{
switch (packet.Type)
{
case PacketType.SERVERDATA_AUTH:
Authenticate(sender, packet);
break;
case PacketType.SERVERDATA_EXECCOMMAND:
if (sender.IsAuthed)
{
HandleCommand(sender, packet);
}
else
{
sender.SendPacket(new RconPacket(packet.Id, PacketType.SERVERDATA_RESPONSE_VALUE, "Not authenticated"));
}
break;
default:
Log.Error($"Recieved an unsupported packet type {packet.Type}. Id: {packet.Id}");
sender.SendPacket(new RconPacket(packet.Id, PacketType.SERVERDATA_RESPONSE_VALUE, "Invalid packet type"));
break;
}
}
private void HandleCommand(RconClient sender, RconPacket packet)
{
var message = CommandHandler?.Invoke(packet.Body) ?? "No command handler defined on host.";
var response = new RconPacket
{
Id = packet.Id,
Type = PacketType.SERVERDATA_RESPONSE_VALUE,
Body = message
};
sender.SendPacket(response);
}
private void Authenticate(RconClient sender, RconPacket packet)
{
var hash = Md5Util.HashString(packet.Body);
if (_pwHash != null && hash.SequenceEqual(_pwHash))
{
Log.Info($"{sender.RemoteEndPoint}: Authorized");
sender.SendPacket(new RconPacket(packet.Id, PacketType.SERVERDATA_AUTHRESPONSE, string.Empty));
sender.IsAuthed = true;
}
else
{
Log.Warn($"{sender.RemoteEndPoint}: Incorrect password attempt");
sender.SendPacket(new RconPacket(-1, PacketType.SERVERDATA_AUTHRESPONSE, string.Empty));
sender.IsAuthed = false;
}
}
private void DoEndAccept(IAsyncResult ar)
{
try
{
var listener = (Socket)ar.AsyncState;
var remoteSocket = listener.EndAccept(ar);
var client = new RconClient(remoteSocket);
Log.Info($"Accepted client {remoteSocket.RemoteEndPoint}");
_clients.Add(client);
client.MessageReceived += Client_MessageReceived;
client.ConnectionClosed += x => _clients.Remove(x);
client.StartListening();
listener.BeginAccept(DoEndAccept, listener);
}
catch
{
// Dies when the socket is disposed, but we don't care.
}
}
private void Authenticate(RconClient sender, RconPacket packet)
{
var hash = Md5Util.HashString(packet.Body);
if (_pwHash != null && hash.SequenceEqual(_pwHash))
{
Log.Info($"{sender.RemoteEndPoint}: Authorized");
// Necessary to send an empty RESPONSE_VALUE before sending the AUTHRESPONSE, otherwise most RCON clients don´t realize AUTH has been successfully.
// See https://developer.valvesoftware.com/wiki/Source_RCON_Protocol#SERVERDATA_AUTH_RESPONSE
// >> When the server receives an auth request, it will respond with an empty SERVERDATA_RESPONSE_VALUE, followed immediately by a SERVERDATA_AUTH_RESPONSE indicating whether authentication succeeded or failed.
sender.SendPacket(new RconPacket(packet.Id, PacketType.SERVERDATA_RESPONSE_VALUE, string.Empty));
sender.SendPacket(new RconPacket(packet.Id, PacketType.SERVERDATA_AUTHRESPONSE, string.Empty));
sender.IsAuthed = true;
}
else
{
Log.Warn($"{sender.RemoteEndPoint}: Incorrect password attempt");
sender.SendPacket(new RconPacket(packet.Id, PacketType.SERVERDATA_RESPONSE_VALUE, string.Empty)); // same here by definition although most clients realized the wrong AUTH info
sender.SendPacket(new RconPacket(-1, PacketType.SERVERDATA_AUTHRESPONSE, string.Empty));
sender.IsAuthed = false;
}
}