public async Task StartConnectionAsync()
{
while (!Cancellation.IsCancellationRequested && this.tcp.Connected)
{
Packet packet = await this.GetNextPacketAsync();
if (this.State == ClientState.Play && packet.data.Length < 1)
{
this.Disconnect();
}
switch (this.State)
{
case ClientState.Status: // Server ping/list
switch (packet.id)
{
case 0x00:
var status = new ServerStatus(Server);
await this.SendPacketAsync(new RequestResponse(status));
break;
case 0x01:
await this.SendPacketAsync(new PingPong(packet.data));
this.Disconnect();
break;
}
break;
case ClientState.Handshaking:
if (packet.id == 0x00)
{
if (packet == null)
{
throw new InvalidOperationException();
}
var handshake = await PacketSerializer.FastDeserializeAsync <Handshake>(packet.data);
var nextState = handshake.NextState;
if (nextState != ClientState.Status && nextState != ClientState.Login)
{
this.Logger.LogDebug($"Client sent unexpected state ({(int)nextState}), forcing it to disconnect");
await this.DisconnectAsync(ChatMessage.Simple("you seem suspicious"));
}
this.State = nextState;
this.Logger.LogInformation($"Handshaking with client (protocol: {handshake.Version}, server: {handshake.ServerAddress}:{handshake.ServerPort})");
}
else
{
// Handle legacy ping
}
break;
case ClientState.Login:
switch (packet.id)
{
default:
this.Logger.LogError("Client in state Login tried to send an unimplemented packet. Forcing it to disconnect.");
await this.DisconnectAsync("Unknown Packet Id.");
break;
case 0x00:
var loginStart = await PacketSerializer.FastDeserializeAsync <LoginStart>(packet.data);
string username = config.MulitplayerDebugMode ? $"Player{Globals.Random.Next(1, 999)}" : loginStart.Username;
this.Logger.LogDebug($"Received login request from user {loginStart.Username}");
await this.Server.DisconnectIfConnectedAsync(username);
if (this.config.OnlineMode)
{
var user = await MinecraftAPI.GetUserAsync(loginStart.Username);
this.Player = new Player(Guid.Parse(user.Id), loginStart.Username, this)
{
World = this.Server.World
};
this.packetCryptography.GenerateKeyPair();
var values = this.packetCryptography.GeneratePublicKeyAndToken();
this.randomToken = values.randomToken;
await this.SendPacketAsync(new EncryptionRequest(values.publicKey, this.randomToken));
break;
}
this.Player = new Player(UUIDFactory.CreateUUID(3, 1, $"OfflinePlayer:{username}"), username, this)
{
World = this.Server.World
};
//await this.SetCompression();
await this.ConnectAsync();
break;
case 0x01:
var encryptionResponse = PacketSerializer.FastDeserialize <EncryptionResponse>(packet.data);
this.sharedKey = this.packetCryptography.Decrypt(encryptionResponse.SharedSecret);
var decryptedToken = this.packetCryptography.Decrypt(encryptionResponse.VerifyToken);
if (!decryptedToken.SequenceEqual(this.randomToken))
{
await this.DisconnectAsync("Invalid token..");
break;
}
var serverId = sharedKey.Concat(this.packetCryptography.PublicKey).ToArray().MinecraftShaDigest();
JoinedResponse response = await MinecraftAPI.HasJoined(this.Player.Username, serverId);
if (response is null)
{
this.Logger.LogWarning($"Failed to auth {this.Player.Username}");
await this.DisconnectAsync("Unable to authenticate..");
break;
}
this.encryptionEnabled = true;
this.minecraftStream = new AesStream(this.debugStream ?? (Stream)this.tcp.GetStream(), this.sharedKey);
//await this.SetCompression();
await ConnectAsync();
break;
case 0x02:
// Login Plugin Response
break;
}
break;
case ClientState.Play:
//await this.Logger.LogDebugAsync($"Received Play packet with Packet ID 0x{packet.id.ToString("X")}");
await PacketHandler.HandlePlayPackets(packet, this);
break;
}
//await Task.Delay(50);
}
Logger.LogInformation($"Disconnected client");
if (this.State == ClientState.Play)
{
await this.Server.Events.InvokePlayerLeaveAsync(new PlayerLeaveEventArgs(this.Player));
}
if (tcp.Connected)
{
this.tcp.Close();
if (this.Player != null)
{
this.Server.OnlinePlayers.TryRemove(this.Player.Uuid, out var _);
}
}
}
public async Task StartConnectionAsync()
{
while (!Cancellation.IsCancellationRequested && this.Tcp.Connected)
{
Packet packet = this.Compressed ? await this.GetNextCompressedPacketAsync() : await this.GetNextPacketAsync();
Packet returnPacket;
if (this.State == ClientState.Play && packet.PacketData.Length < 1)
{
this.Disconnect();
}
switch (this.State)
{
case ClientState.Status: //server ping/list
switch (packet.PacketId)
{
case 0x00:
var status = new ServerStatus(OriginServer);
await PacketHandler.CreateAsync(new RequestResponse(status), this.MinecraftStream);
break;
case 0x01:
await PacketHandler.CreateAsync(new PingPong(packet.PacketData), this.MinecraftStream);
this.Disconnect();
break;
}
break;
case ClientState.Handshaking:
if (packet.PacketId == 0x00)
{
if (packet == null)
{
throw new InvalidOperationException();
}
var handshake = await PacketHandler.CreateAsync(new Handshake(packet.PacketData));
var nextState = handshake.NextState;
if (nextState != ClientState.Status && nextState != ClientState.Login)
{
this.Logger.LogDebug($"Client sent unexpected state ({(int)nextState}), forcing it to disconnect");
await this.DisconnectAsync(Chat.ChatMessage.Simple("you seem suspicious"));
}
this.State = nextState;
this.Logger.LogMessage($"Handshaking with client (protocol: {handshake.Version}, server: {handshake.ServerAddress}:{handshake.ServerPort})");
}
else
{
//Handle legacy ping stuff
}
break;
case ClientState.Login:
switch (packet.PacketId)
{
default:
this.Logger.LogError("Client in state Login tried to send an unimplemented packet. Forcing it to disconnect.");
await this.DisconnectAsync(ChatMessage.Simple("Unknown Packet Id."));
break;
case 0x00:
var loginStart = await PacketHandler.CreateAsync(new LoginStart(packet.PacketData));
string username = loginStart.Username;
if (Config.MulitplayerDebugMode)
{
username = $"Player{new Random().Next(1, 999)}";
this.Logger.LogDebug($"Overriding username from {loginStart.Username} to {username}");
}
this.Logger.LogDebug($"Received login request from user {loginStart.Username}");
if (this.OriginServer.CheckPlayerOnline(username))
{
await this.OriginServer.Clients.FirstOrDefault(c => c.Player.Username == username).DisconnectAsync(Chat.ChatMessage.Simple("Logged in from another location"));
}
if (this.Config.OnlineMode)
{
var users = await MinecraftAPI.GetUsersAsync(new string[] { loginStart.Username });
var uid = users.FirstOrDefault();
var uuid = Guid.Parse(uid.Id);
this.Player = new Player(uuid, loginStart.Username, this);
PacketCryptography.GenerateKeyPair();
var pubKey = PacketCryptography.PublicKeyToAsn();
this.Token = PacketCryptography.GetRandomToken();
returnPacket = await PacketHandler.CreateAsync(new EncryptionRequest(pubKey, this.Token), this.MinecraftStream);
break;
}
this.Player = new Player(Guid.NewGuid(), username, this);
await ConnectAsync(this.Player.Uuid);
break;
case 0x01:
var encryptionResponse = await PacketHandler.CreateAsync(new EncryptionResponse(packet.PacketData));
JoinedResponse response;
this.SharedKey = PacketCryptography.Decrypt(encryptionResponse.SharedSecret);
var dec2 = PacketCryptography.Decrypt(encryptionResponse.VerifyToken);
var dec2Base64 = Convert.ToBase64String(dec2);
var tokenBase64 = Convert.ToBase64String(this.Token);
if (!dec2Base64.Equals(tokenBase64))
{
await this.DisconnectAsync(Chat.ChatMessage.Simple("Invalid token.."));
break;
}
var encodedKey = PacketCryptography.PublicKeyToAsn();
var serverId = PacketCryptography.MinecraftShaDigest(SharedKey.Concat(encodedKey).ToArray());
response = await MinecraftAPI.HasJoined(this.Player.Username, serverId);
if (response is null)
{
this.Logger.LogWarning($"Failed to auth {this.Player.Username}");
await this.DisconnectAsync(Chat.ChatMessage.Simple("Unable to authenticate.."));
break;
}
this.EncryptionEnabled = true;
this.MinecraftStream = new AesStream(this.Tcp.GetStream(), this.SharedKey);
await ConnectAsync(new Guid(response.Id));
break;
case 0x02:
// Login Plugin Response
break;
}
break;
case ClientState.Play:
///this.Logger.LogDebugAsync($"Received Play packet with Packet ID 0x{packet.PacketId.ToString("X")}");
await PacketHandler.HandlePlayPackets(packet, this);
break;
}
}
Logger.LogMessage($"Disconnected client");
if (this.IsPlaying)
{
await this.OriginServer.Events.InvokePlayerLeave(new PlayerLeaveEventArgs(this));
}
this.OriginServer.Broadcast(string.Format(this.Config.LeaveMessage, this.Player.Username));
this.Player = null;
if (Tcp.Connected)
{
this.Tcp.Close();
}
}