/// <summary>
/// Disconnects the specified client.
/// </summary>
/// <param name="ipPort">IP:port of the client.</param>
public void DisconnectClient(string ipPort)
{
if (String.IsNullOrEmpty(ipPort))
{
throw new ArgumentNullException(nameof(ipPort));
}
ClientMetadata client = null;
if (!_Clients.TryGetValue(ipPort, out client))
{
Logger?.Invoke(_Header + "unable to find client: " + ipPort);
}
else
{
if (!_ClientsTimedout.ContainsKey(ipPort))
{
Logger?.Invoke(_Header + "kicking: " + ipPort);
_ClientsKicked.TryAdd(ipPort, DateTime.Now);
}
}
if (client != null)
{
if (!client.TokenSource.IsCancellationRequested)
{
client.TokenSource.Cancel();
Logger?.Invoke(_Header + "requesting disposal of: " + ipPort);
}
client.Dispose();
}
}
private async Task SendInternalAsync(string ipPort, long contentLength, Stream stream)
{
ClientMetadata client = null;
if (!_Clients.TryGetValue(ipPort, out client))
{
return;
}
if (client == null)
{
return;
}
long bytesRemaining = contentLength;
int bytesRead = 0;
byte[] buffer = new byte[_StreamBufferSize];
try
{
await client.SendLock.WaitAsync();
while (bytesRemaining > 0)
{
bytesRead = await stream.ReadAsync(buffer, 0, buffer.Length);
if (bytesRead > 0)
{
if (!_Ssl)
{
await client.NetworkStream.WriteAsync(buffer, 0, bytesRead);
}
else
{
await client.SslStream.WriteAsync(buffer, 0, bytesRead);
}
bytesRemaining -= bytesRead;
_Stats.SentBytes += bytesRead;
}
}
if (!_Ssl)
{
await client.NetworkStream.FlushAsync();
}
else
{
await client.SslStream.FlushAsync();
}
}
finally
{
if (client != null)
{
client.SendLock.Release();
}
}
}
/// <summary>
/// Determines if a client is connected by its IP:port.
/// </summary>
/// <param name="ipPort">The client IP:port string.</param>
/// <returns>True if connected.</returns>
public bool IsConnected(string ipPort)
{
if (String.IsNullOrEmpty(ipPort))
{
throw new ArgumentNullException(nameof(ipPort));
}
ClientMetadata client = null;
return(_Clients.TryGetValue(ipPort, out client));
}
private async Task <byte[]> DataReadAsync(ClientMetadata client, CancellationToken token)
{
byte[] buffer = new byte[_Settings.StreamBufferSize];
int read = 0;
if (!_Ssl)
{
using (MemoryStream ms = new MemoryStream())
{
while (true)
{
read = await client.NetworkStream.ReadAsync(buffer, 0, buffer.Length, token).ConfigureAwait(false);
if (read > 0)
{
await ms.WriteAsync(buffer, 0, read, token).ConfigureAwait(false);
return(ms.ToArray());
}
else
{
throw new SocketException();
}
}
}
}
else
{
using (MemoryStream ms = new MemoryStream())
{
while (true)
{
read = await client.SslStream.ReadAsync(buffer, 0, buffer.Length, token).ConfigureAwait(false);
if (read > 0)
{
await ms.WriteAsync(buffer, 0, read, token).ConfigureAwait(false);
return(ms.ToArray());
}
else
{
throw new SocketException();
}
}
}
}
}
private async Task <bool> StartTls(ClientMetadata client)
{
try
{
await client.SslStream.AuthenticateAsServerAsync(
_SslCertificate,
MutuallyAuthenticate,
SslProtocols.Tls12,
!AcceptInvalidCertificates);
if (!client.SslStream.IsEncrypted)
{
Logger?.Invoke("[SimpleTcp.Server] Client " + client.IpPort + " not encrypted, disconnecting");
client.Dispose();
return(false);
}
if (!client.SslStream.IsAuthenticated)
{
Logger?.Invoke("[SimpleTcp.Server] Client " + client.IpPort + " not SSL/TLS authenticated, disconnecting");
client.Dispose();
return(false);
}
if (MutuallyAuthenticate && !client.SslStream.IsMutuallyAuthenticated)
{
Logger?.Invoke("[SimpleTcp.Server] Client " + client.IpPort + " failed mutual authentication, disconnecting");
client.Dispose();
return(false);
}
}
catch (Exception e)
{
Logger?.Invoke("[SimpleTcp.Server] Client " + client.IpPort + " SSL/TLS exception: " + Environment.NewLine + e.ToString());
client.Dispose();
return(false);
}
return(true);
}
private async Task <bool> StartTls(ClientMetadata client)
{
try
{
await client.SslStream.AuthenticateAsServerAsync(
_SslCertificate,
MutuallyAuthenticate,
SslProtocols.Tls12,
!AcceptInvalidCertificates);
if (!client.SslStream.IsEncrypted)
{
Log("[" + client.IpPort + "] not encrypted");
client.Dispose();
return(false);
}
if (!client.SslStream.IsAuthenticated)
{
Log("[" + client.IpPort + "] stream not authenticated");
client.Dispose();
return(false);
}
if (MutuallyAuthenticate && !client.SslStream.IsMutuallyAuthenticated)
{
Log("[" + client.IpPort + "] failed mutual authentication");
client.Dispose();
return(false);
}
}
catch (Exception e)
{
Log("[" + client.IpPort + "] TLS exception" + Environment.NewLine + e.ToString());
client.Dispose();
return(false);
}
return(true);
}
/// <summary>
/// Send data to the specified client by IP:port.
/// </summary>
/// <param name="ipPort">The client IP:port string.</param>
/// <param name="data">Byte array containing data to send.</param>
public void Send(string ipPort, byte[] data)
{
if (String.IsNullOrEmpty(ipPort))
{
throw new ArgumentNullException(nameof(ipPort));
}
if (data == null || data.Length < 1)
{
throw new ArgumentNullException(nameof(data));
}
ClientMetadata client = null;
if (!_Clients.TryGetValue(ipPort, out client))
{
return;
}
if (client == null)
{
return;
}
lock (client.SendLock)
{
if (!_Ssl)
{
client.NetworkStream.Write(data, 0, data.Length);
client.NetworkStream.Flush();
}
else
{
client.SslStream.Write(data, 0, data.Length);
client.SslStream.Flush();
}
}
_Stats.SentBytes += data.Length;
}
private async Task <byte[]> DataReadAsync(ClientMetadata client)
{
if (client.Token.IsCancellationRequested)
{
throw new OperationCanceledException();
}
if (!client.NetworkStream.CanRead)
{
return(null);
}
if (!client.NetworkStream.DataAvailable)
{
return(null);
}
if (_Ssl && !client.SslStream.CanRead)
{
return(null);
}
byte[] buffer = new byte[_StreamBufferSize];
int read = 0;
if (!_Ssl)
{
using (MemoryStream ms = new MemoryStream())
{
while (true)
{
read = await client.NetworkStream.ReadAsync(buffer, 0, buffer.Length);
if (read > 0)
{
ms.Write(buffer, 0, read);
return(ms.ToArray());
}
else
{
throw new SocketException();
}
}
}
}
else
{
using (MemoryStream ms = new MemoryStream())
{
while (true)
{
read = await client.SslStream.ReadAsync(buffer, 0, buffer.Length);
if (read > 0)
{
ms.Write(buffer, 0, read);
return(ms.ToArray());
}
else
{
throw new SocketException();
}
}
}
}
}
private async Task DataReceiver(ClientMetadata client)
{
Logger?.Invoke("[SimpleTcp.Server] Data receiver started for client " + client.IpPort);
while (true)
{
try
{
if (client.Token.IsCancellationRequested ||
!IsClientConnected(client.Client))
{
Logger?.Invoke("[SimpleTcp.Server] Client " + client.IpPort + " disconnected");
break;
}
if (client.Token.IsCancellationRequested)
{
Logger?.Invoke("[SimpleTcp.Server] Cancellation requested (data receiver for client " + client.IpPort + ")");
break;
}
byte[] data = await DataReadAsync(client);
if (data == null)
{
await Task.Delay(30);
continue;
}
DataReceived?.Invoke(this, new DataReceivedFromClientEventArgs(client.IpPort, data));
_Stats.ReceivedBytes += data.Length;
UpdateClientLastSeen(client.IpPort);
}
catch (SocketException)
{
Logger?.Invoke("[SimpleTcp.Server] Data receiver socket exception (disconnection) for " + client.IpPort);
}
catch (Exception e)
{
Logger?.Invoke("[SimpleTcp.Server] Data receiver exception for client " + client.IpPort + ":" +
Environment.NewLine +
e.ToString() +
Environment.NewLine);
break;
}
}
Logger?.Invoke("[SimpleTcp.Server] Data receiver terminated for client " + client.IpPort);
if (_ClientsKicked.ContainsKey(client.IpPort))
{
ClientDisconnected?.Invoke(this, new ClientDisconnectedEventArgs(client.IpPort, DisconnectReason.Kicked));
}
else if (_ClientsTimedout.ContainsKey(client.IpPort))
{
ClientDisconnected?.Invoke(this, new ClientDisconnectedEventArgs(client.IpPort, DisconnectReason.Timeout));
}
else
{
ClientDisconnected?.Invoke(this, new ClientDisconnectedEventArgs(client.IpPort, DisconnectReason.Normal));
}
DateTime removedTs;
_Clients.TryRemove(client.IpPort, out ClientMetadata destroyed);
_ClientsLastSeen.TryRemove(client.IpPort, out removedTs);
_ClientsKicked.TryRemove(client.IpPort, out removedTs);
_ClientsTimedout.TryRemove(client.IpPort, out removedTs);
client.Dispose();
}
private async void AcceptConnections()
{
while (!_Token.IsCancellationRequested)
{
ClientMetadata client = null;
try
{
System.Net.Sockets.TcpClient tcpClient = await _Listener.AcceptTcpClientAsync();
string clientIp = tcpClient.Client.RemoteEndPoint.ToString();
client = new ClientMetadata(tcpClient);
if (_Ssl)
{
if (AcceptInvalidCertificates)
{
client.SslStream = new SslStream(client.NetworkStream, false, new RemoteCertificateValidationCallback(AcceptCertificate));
}
else
{
client.SslStream = new SslStream(client.NetworkStream, false);
}
bool success = await StartTls(client);
if (!success)
{
client.Dispose();
continue;
}
}
_Clients.TryAdd(clientIp, client);
_ClientsLastSeen.TryAdd(clientIp, DateTime.Now);
Logger?.Invoke("[SimpleTcp.Server] Starting data receiver for: " + clientIp);
ClientConnected?.Invoke(this, new ClientConnectedEventArgs(clientIp));
Task unawaited = Task.Run(() => DataReceiver(client), _Token);
}
catch (OperationCanceledException)
{
return;
}
catch (ObjectDisposedException)
{
if (client != null)
{
client.Dispose();
}
continue;
}
catch (Exception e)
{
if (client != null)
{
client.Dispose();
}
Logger?.Invoke("[SimpleTcp.Server] Exception while awaiting connections: " + e.ToString());
continue;
}
}
}
private async Task DataReceiver(ClientMetadata client)
{
Logger?.Invoke(_Header + "data receiver started for client " + client.IpPort, TCPLogType.Debug);
while (true)
{
try
{
if (client.Token.IsCancellationRequested ||
!IsClientConnected(client.Client))
{
Logger?.Invoke(_Header + "client " + client.IpPort + " disconnected", TCPLogType.Debug);
break;
}
if (client.Token.IsCancellationRequested)
{
Logger?.Invoke(_Header + "cancellation requested (data receiver for client " + client.IpPort + ")", TCPLogType.Debug);
break;
}
byte[] m_Buffer = await DataReadAsync(client);
if (m_Buffer == null)
{
await Task.Delay(30);
continue;
}
int BufferStart = 0;
int nBytesRec = m_Buffer.Length;
// We support the PROXY protocol (currently v1)
// PROXY TCP4 192.168.0.37 192.168.0.121 57307 16248\r\n
// PROXY TCP6 ffff:f...f:ffff ffff:f...f:ffff 65535 65535\r\n
// \x0D \x0A \x0D \x0A \x00 \x0D \x0A \x51 \x55 \x49 \x54 \x0A
// Min 32 bytes, max 108 bytes
if (nBytesRec > 32 && m_Buffer[0] == 'P' && m_Buffer[1] == 'R' && m_Buffer[2] == 'O' && m_Buffer[3] == 'X' && m_Buffer[4] == 'Y' && m_Buffer[5] == ' ')
{
try
{
string msg = Encoding.UTF8.GetString(m_Buffer, 0, Math.Min(108, nBytesRec)); // 108 is the max we need to parse
string[] proxy = msg.Split(new string[] { "\r\n" }, StringSplitOptions.RemoveEmptyEntries);
string[] proxyparts = proxy[0].Split(new string[] { " " }, StringSplitOptions.RemoveEmptyEntries);
client.OriginalIP = IPAddress.Parse(proxyparts[2]);
client.OriginalSrcPort = int.Parse(proxyparts[4]);
client.OriginalDestPort = int.Parse(proxyparts[5]);
client.IsProxied = true;
int split = msg.IndexOf("\r\n");
if (split > 32)
{
nBytesRec -= split + 2;
BufferStart = split + 2;
}
}
catch (Exception)
{
}
}
byte[] package = new byte[nBytesRec];
Buffer.BlockCopy(m_Buffer, BufferStart, package, 0, nBytesRec);
var args = new DataReceivedFromClientEventArgs(client.IpPort, package, client.IncomingProtocol, client.Client.Client.RemoteEndPoint);
args.Data = package;
args.Protocol = client.IncomingProtocol;
if (client.IsWebSocket)
{
args.WebSocketFrame = DecodeWebSocketMessage(package);
if (args.WebSocketFrame.OpCode == 0x9)
{
package[0] = (byte)((package[0] & 0xF0) + 0xA);
Send(client.IpPort, package);
return;
}
}
if (client.IsProxied)
{
args.OriginalIP = client.OriginalIP;
args.OriginalSrcPort = client.OriginalSrcPort;
args.OriginalDestPort = client.OriginalDestPort;
}
_Events.HandleDataReceived(this, args);
_Statistics.ReceivedBytes += package.Length;
UpdateClientLastSeen(client.IpPort);
}
catch (SocketException)
{
Logger?.Invoke(_Header + "data receiver socket exception (disconnection) for " + client.IpPort, TCPLogType.Debug);
}
catch (Exception e)
{
Logger?.Invoke(_Header + "data receiver exception for client " + client.IpPort + ":" +
Environment.NewLine +
e.ToString() +
Environment.NewLine, TCPLogType.Warn);
break;
}
}
Logger?.Invoke(_Header + "data receiver terminated for client " + client.IpPort, TCPLogType.Debug);
if (_ClientsKicked.ContainsKey(client.IpPort))
{
_Events.HandleClientDisconnected(this, new ClientDisconnectedEventArgs(client.IpPort, DisconnectReason.Kicked));
}
else if (_ClientsTimedout.ContainsKey(client.IpPort))
{
_Events.HandleClientDisconnected(this, new ClientDisconnectedEventArgs(client.IpPort, DisconnectReason.Timeout));
}
else
{
_Events.HandleClientDisconnected(this, new ClientDisconnectedEventArgs(client.IpPort, DisconnectReason.Normal));
}
DateTime removedTs;
_Clients.TryRemove(client.IpPort, out ClientMetadata destroyed);
_ClientsLastSeen.TryRemove(client.IpPort, out removedTs);
_ClientsKicked.TryRemove(client.IpPort, out removedTs);
_ClientsTimedout.TryRemove(client.IpPort, out removedTs);
client.Dispose();
}
private async Task DataReceiver(ClientMetadata client)
{
Logger?.Invoke(_Header + "data receiver started for client " + client.IpPort);
CancellationTokenSource linkedCts = CancellationTokenSource.CreateLinkedTokenSource(_Token, client.Token);
while (true)
{
try
{
if (!IsClientConnected(client.Client))
{
Logger?.Invoke(_Header + "client " + client.IpPort + " disconnected");
break;
}
if (client.Token.IsCancellationRequested)
{
Logger?.Invoke(_Header + "cancellation requested (data receiver for client " + client.IpPort + ")");
break;
}
byte[] data = await DataReadAsync(client, linkedCts.Token).ConfigureAwait(false);
if (data == null)
{
await Task.Delay(10).ConfigureAwait(false);
continue;
}
Task unawaited = Task.Run(() => _Events.HandleDataReceived(this, new DataReceivedFromClientEventArgs(client.IpPort, data)), linkedCts.Token);
_Statistics.ReceivedBytes += data.Length;
UpdateClientLastSeen(client.IpPort);
}
catch (IOException)
{
Logger?.Invoke(_Header + "data receiver canceled, peer disconnected [" + client.IpPort + "]");
}
catch (SocketException)
{
Logger?.Invoke(_Header + "data receiver canceled, peer disconnected [" + client.IpPort + "]");
}
catch (TaskCanceledException)
{
Logger?.Invoke(_Header + "data receiver task canceled [" + client.IpPort + "]");
}
catch (ObjectDisposedException)
{
Logger?.Invoke(_Header + "data receiver canceled due to disposal [" + client.IpPort + "]");
}
catch (Exception e)
{
Logger?.Invoke(_Header + "data receiver exception [" + client.IpPort + "]:" +
Environment.NewLine +
e.ToString() +
Environment.NewLine);
break;
}
}
Logger?.Invoke(_Header + "data receiver terminated for client " + client.IpPort);
if (_ClientsKicked.ContainsKey(client.IpPort))
{
_Events.HandleClientDisconnected(this, new ClientDisconnectedEventArgs(client.IpPort, DisconnectReason.Kicked));
}
else if (_ClientsTimedout.ContainsKey(client.IpPort))
{
_Events.HandleClientDisconnected(this, new ClientDisconnectedEventArgs(client.IpPort, DisconnectReason.Timeout));
}
else
{
_Events.HandleClientDisconnected(this, new ClientDisconnectedEventArgs(client.IpPort, DisconnectReason.Normal));
}
DateTime removedTs;
_Clients.TryRemove(client.IpPort, out ClientMetadata destroyed);
_ClientsLastSeen.TryRemove(client.IpPort, out removedTs);
_ClientsKicked.TryRemove(client.IpPort, out removedTs);
_ClientsTimedout.TryRemove(client.IpPort, out removedTs);
client.Dispose();
}
private async Task AcceptConnections()
{
_IsListening = true;
_Listener.Start();
while (!_Token.IsCancellationRequested)
{
ClientMetadata client = null;
try
{
System.Net.Sockets.TcpClient tcpClient = await _Listener.AcceptTcpClientAsync().ConfigureAwait(false);
string clientIp = tcpClient.Client.RemoteEndPoint.ToString();
client = new ClientMetadata(tcpClient);
if (_Ssl)
{
if (_Settings.AcceptInvalidCertificates)
{
client.SslStream = new SslStream(client.NetworkStream, false, new RemoteCertificateValidationCallback(AcceptCertificate));
}
else
{
client.SslStream = new SslStream(client.NetworkStream, false);
}
bool success = await StartTls(client).ConfigureAwait(false);
if (!success)
{
client.Dispose();
continue;
}
}
_Clients.TryAdd(clientIp, client);
_ClientsLastSeen.TryAdd(clientIp, DateTime.Now);
Logger?.Invoke(_Header + "starting data receiver for: " + clientIp);
_Events.HandleClientConnected(this, new ClientConnectedEventArgs(clientIp));
CancellationTokenSource linkedCts = CancellationTokenSource.CreateLinkedTokenSource(client.Token, _Token);
Task unawaited = Task.Run(() => DataReceiver(client), linkedCts.Token);
}
catch (TaskCanceledException)
{
_IsListening = false;
if (client != null)
{
client.Dispose();
}
return;
}
catch (OperationCanceledException)
{
_IsListening = false;
if (client != null)
{
client.Dispose();
}
return;
}
catch (ObjectDisposedException)
{
if (client != null)
{
client.Dispose();
}
continue;
}
catch (Exception e)
{
if (client != null)
{
client.Dispose();
}
Logger?.Invoke(_Header + "exception while awaiting connections: " + e.ToString());
continue;
}
}
_IsListening = false;
}
private async Task SendInternalAsync(string ipPort, long contentLength, Stream stream, CancellationToken token)
{
ClientMetadata client = null;
try
{
if (!_Clients.TryGetValue(ipPort, out client))
{
return;
}
if (client == null)
{
return;
}
long bytesRemaining = contentLength;
int bytesRead = 0;
byte[] buffer = new byte[_Settings.StreamBufferSize];
await client.SendLock.WaitAsync(token).ConfigureAwait(false);
while (bytesRemaining > 0)
{
bytesRead = await stream.ReadAsync(buffer, 0, buffer.Length, token).ConfigureAwait(false);
if (bytesRead > 0)
{
if (!_Ssl)
{
await client.NetworkStream.WriteAsync(buffer, 0, bytesRead, token).ConfigureAwait(false);
}
else
{
await client.SslStream.WriteAsync(buffer, 0, bytesRead, token).ConfigureAwait(false);
}
bytesRemaining -= bytesRead;
_Statistics.SentBytes += bytesRead;
}
}
if (!_Ssl)
{
await client.NetworkStream.FlushAsync(token).ConfigureAwait(false);
}
else
{
await client.SslStream.FlushAsync(token).ConfigureAwait(false);
}
}
catch (TaskCanceledException)
{
}
catch (OperationCanceledException)
{
}
finally
{
if (client != null)
{
client.SendLock.Release();
}
}
}
private async Task DataReceiver(ClientMetadata client)
{
string header = "[" + client.IpPort + "]";
Log(header + " data receiver started");
while (true)
{
try
{
if (!IsClientConnected(client.Client))
{
Log(header + " client no longer connected");
break;
}
if (client.Token.IsCancellationRequested)
{
Log(header + " cancellation requested");
break;
}
byte[] data = await DataReadAsync(client);
if (data == null)
{
await Task.Delay(30);
continue;
}
if (DataReceived != null)
{
Task unawaited = Task.Run(() => DataReceived(client.IpPort, data));
}
UpdateClientLastSeen(client.IpPort);
}
catch (Exception e)
{
Log(
Environment.NewLine +
header + " data receiver exception:" +
Environment.NewLine +
e.ToString() +
Environment.NewLine);
break;
}
}
Log(header + " data receiver terminated");
if (ClientDisconnected != null)
{
Task unawaited = null;
if (_ClientsKicked.ContainsKey(client.IpPort))
{
unawaited = Task.Run(() => ClientDisconnected(client.IpPort, DisconnectReason.Kicked));
}
else if (_ClientsTimedout.ContainsKey(client.IpPort))
{
unawaited = Task.Run(() => ClientDisconnected(client.IpPort, DisconnectReason.Timeout));
}
else
{
unawaited = Task.Run(() => ClientDisconnected(client.IpPort, DisconnectReason.Normal));
}
}
DateTime removedTs;
_Clients.TryRemove(client.IpPort, out ClientMetadata destroyed);
_ClientsLastSeen.TryRemove(client.IpPort, out removedTs);
_ClientsKicked.TryRemove(client.IpPort, out removedTs);
_ClientsTimedout.TryRemove(client.IpPort, out removedTs);
client.Dispose();
}
private async void AcceptConnections()
{
while (!_Token.IsCancellationRequested)
{
ClientMetadata client = null;
try
{
System.Net.Sockets.TcpClient tcpClient = await _Listener.AcceptTcpClientAsync();
string clientIp = tcpClient.Client.RemoteEndPoint.ToString();
client = new ClientMetadata(tcpClient);
if (_Ssl)
{
if (AcceptInvalidCertificates)
{
client.SslStream = new SslStream(client.NetworkStream, false, new RemoteCertificateValidationCallback(AcceptCertificate));
}
else
{
client.SslStream = new SslStream(client.NetworkStream, false);
}
bool success = await StartTls(client);
if (!success)
{
client.Dispose();
continue;
}
}
_Clients.TryAdd(clientIp, client);
_ClientsLastSeen.TryAdd(clientIp, DateTime.Now);
Log("[" + clientIp + "] starting data receiver");
if (ClientConnected != null)
{
await Task.Run(() => ClientConnected(clientIp));
}
Task dataRecv = Task.Run(() => DataReceiver(client), _Token);
}
catch (OperationCanceledException)
{
return;
}
catch (ObjectDisposedException)
{
if (client != null)
{
client.Dispose();
}
continue;
}
catch (Exception e)
{
if (client != null)
{
client.Dispose();
}
Log("*** AcceptConnections exception: " + e.ToString());
continue;
}
finally
{
}
}
}