/// <summary>
/// Asynchronously initialize the server side of this connection
/// </summary>
/// <param name="serverEndPoint"> Information of the new server this connection should connect to. </param>
/// <returns> A task which returns the LogOnPacket or DisconnectPacket of the established connection. </returns>
public async Task<Packet> InitializeServerAsync(RemoteServerInfo serverEndPoint)
{
ProxyEndPoint server = null;
try
{
UnregisterServer ();
_serverEndPoint = null;
if (!string.IsNullOrEmpty(serverEndPoint.KickMessage))
{
await KickUserAsync(serverEndPoint.KickMessage);
throw new OperationCanceledException("User got kicked.");
}
if (serverEndPoint.MinecraftVersion == 0)
_server.GetServerVersion(this, serverEndPoint);
if (serverEndPoint.MinecraftVersion == null)
{
var information =await MinecraftPinger.GetServerInformationAsync(serverEndPoint.EndPoint);
if((serverEndPoint.MinecraftVersion = information.ProtocolVersion) == null)
throw new InvalidOperationException("Could not auto detect server version");
}
var socket = new Socket(serverEndPoint.EndPoint.AddressFamily, SocketType.Stream, ProtocolType.Tcp)
{
ReceiveBufferSize = 1024*1024
};
await socket.ConnectTaskAsync(serverEndPoint.EndPoint);
server =
new ProxyEndPoint(
ServerRemoteInterface.Create(new NetworkStream(socket), (int)serverEndPoint.MinecraftVersion),
(int)serverEndPoint.MinecraftVersion);
server.RemoteEndPoint = (IPEndPoint) socket.RemoteEndPoint;
var handshakeRequest = new HandshakeRequest
{
UserName = Username,
Host = Host,
ProtocolVersion = (byte) serverEndPoint.MinecraftVersion
};
await server.SendPacketAsync(handshakeRequest);
Packet tp = await server.ReceivePacketAsync ();
if (tp is DisconnectPacket)
{
throw new OperationCanceledException((tp as DisconnectPacket).Reason);
}
var encryptionKeyRequest = tp as EncryptionKeyRequest;
server.ConnectionKey = ProtocolSecurity.GenerateAes128Key ();
byte[] key = ProtocolSecurity.RsaEncrypt(server.ConnectionKey, encryptionKeyRequest.PublicKey.ToArray (),
false);
byte[] verifyToken = ProtocolSecurity.RsaEncrypt(encryptionKeyRequest.VerifyToken.ToArray (),
encryptionKeyRequest.PublicKey.ToArray (), false);
var encryptionKeyResponse = new EncryptionKeyResponse
{
SharedKey = key,
VerifyToken = verifyToken
};
await server.SendPacketAsync(encryptionKeyResponse);
Packet p = await server.ReceivePacketAsync ();
server.EnableAes ();
await server.SendPacketAsync(new RespawnRequestPacket ());
return await server.ReceivePacketAsync ();
}
catch (Exception ex)
{
_quitMessagePosted = true;
_logger.Error("Could not connect to remote server", ex);
throw;
}
finally
{
_serverEndPoint = server;
}
}