NetCoreServer/source/NetCoreServer/SslClient.cs at master · pythonology/NetCoreServer · GitHub

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using System;

using System.Net;

using System.Net.Security;

using System.Net.Sockets;

using System.Security.Cryptography.X509Certificates;

using System.Text;

using System.Threading;

namespace NetCoreServer

{

/// <summary>

/// SSL client is used to read/write data from/into the connected SSL server

/// </summary>

/// <remarks>Thread-safe</remarks>

public class SslClient : IDisposable

{

/// <summary>

/// Initialize SSL client with a given server IP address and port number

/// </summary>

/// <param name="context">SSL context</param>

/// <param name="address">IP address</param>

/// <param name="port">Port number</param>

public SslClient(SslContext context, IPAddress address, int port) : this(context, new IPEndPoint(address, port)) {}

/// <summary>

/// Initialize SSL client with a given server IP address and port number

/// </summary>

/// <param name="context">SSL context</param>

/// <param name="address">IP address</param>

/// <param name="port">Port number</param>

public SslClient(SslContext context, string address, int port) : this(context, new IPEndPoint(IPAddress.Parse(address), port)) {}

/// <summary>

/// Initialize SSL client with a given DNS endpoint

/// </summary>

/// <param name="context">SSL context</param>

/// <param name="endpoint">DNS endpoint</param>

public SslClient(SslContext context, DnsEndPoint endpoint) : this(context, endpoint as EndPoint, endpoint.Host, endpoint.Port) {}

/// <summary>

/// Initialize SSL client with a given IP endpoint

/// </summary>

/// <param name="context">SSL context</param>

/// <param name="endpoint">IP endpoint</param>

public SslClient(SslContext context, IPEndPoint endpoint) : this(context, endpoint as EndPoint, endpoint.Address.ToString(), endpoint.Port) {}

/// <summary>

/// Initialize SSL client with a given SSL context, endpoint, address and port

/// </summary>

/// <param name="context">SSL context</param>

/// <param name="endpoint">Endpoint</param>

/// <param name="address">Server address</param>

/// <param name="port">Server port</param>

private SslClient(SslContext context, EndPoint endpoint, string address, int port)

{

Id = Guid.NewGuid();

Address = address;

Port = port;

Context = context;

Endpoint = endpoint;

}

/// <summary>

/// Client Id

/// </summary>

public Guid Id { get; }

/// <summary>

/// SSL server address

/// </summary>

public string Address { get; }

/// <summary>

/// SSL server port

/// </summary>

public int Port { get; }

/// <summary>

/// SSL context

/// </summary>

public SslContext Context { get; }

/// <summary>

/// Endpoint

/// </summary>

public EndPoint Endpoint { get; private set; }

/// <summary>

/// Socket

/// </summary>

public Socket Socket { get; private set; }

/// <summary>

/// Number of bytes pending sent by the client

/// </summary>

public long BytesPending { get; private set; }

/// <summary>

/// Number of bytes sending by the client

/// </summary>

public long BytesSending { get; private set; }

/// <summary>

/// Number of bytes sent by the client

/// </summary>

public long BytesSent { get; private set; }

/// <summary>

/// Number of bytes received by the client

/// </summary>

public long BytesReceived { get; private set; }

/// <summary>

/// Option: dual mode socket

/// </summary>

/// <remarks>

/// Specifies whether the Socket is a dual-mode socket used for both IPv4 and IPv6.

/// Will work only if socket is bound on IPv6 address.

/// </remarks>

public bool OptionDualMode { get; set; }

/// <summary>

/// Option: keep alive

/// </summary>

/// <remarks>

/// This option will setup SO_KEEPALIVE if the OS support this feature

/// </remarks>

public bool OptionKeepAlive { get; set; }

/// <summary>

/// Option: no delay

/// </summary>

/// <remarks>

/// This option will enable/disable Nagle's algorithm for SSL protocol

/// </remarks>

public bool OptionNoDelay { get; set; }

/// <summary>

/// Option: receive buffer limit

/// </summary>

public int OptionReceiveBufferLimit { get; set; } = 0;

/// <summary>

/// Option: receive buffer size

/// </summary>

public int OptionReceiveBufferSize { get; set; } = 8192;

/// <summary>

/// Option: send buffer limit

/// </summary>

public int OptionSendBufferLimit { get; set; } = 0;

/// <summary>

/// Option: send buffer size

/// </summary>

public int OptionSendBufferSize { get; set; } = 8192;

#region Connect/Disconnect client

private bool _disconnecting;

private SocketAsyncEventArgs _connectEventArg;

private SslStream _sslStream;

private Guid? _sslStreamId;

/// <summary>

/// Is the client connecting?

/// </summary>

public bool IsConnecting { get; private set; }

/// <summary>

/// Is the client connected?

/// </summary>

public bool IsConnected { get; private set; }

/// <summary>

/// Is the client handshaking?

/// </summary>

public bool IsHandshaking { get; private set; }

/// <summary>

/// Is the client handshaked?

/// </summary>

public bool IsHandshaked { get; private set; }

/// <summary>

/// Create a new socket object

/// </summary>

/// <remarks>

/// Method may be override if you need to prepare some specific socket object in your implementation.

/// </remarks>

/// <returns>Socket object</returns>

protected virtual Socket CreateSocket()

{

return new Socket(Endpoint.AddressFamily, SocketType.Stream, ProtocolType.Tcp);

}

/// <summary>

/// Connect the client (synchronous)

/// </summary>

/// <remarks>

/// Please note that synchronous connect will not receive data automatically!

/// You should use Receive() or ReceiveAsync() method manually after successful connection.

/// </remarks>

/// <returns>'true' if the client was successfully connected, 'false' if the client failed to connect</returns>

public virtual bool Connect()

{

if (IsConnected || IsHandshaked || IsConnecting || IsHandshaking)

return false;

// Setup buffers

_receiveBuffer = new Buffer();

_sendBufferMain = new Buffer();

_sendBufferFlush = new Buffer();

// Setup event args

_connectEventArg = new SocketAsyncEventArgs();

_connectEventArg.RemoteEndPoint = Endpoint;

_connectEventArg.Completed += OnAsyncCompleted;

// Create a new client socket

Socket = CreateSocket();

// Update the client socket disposed flag

IsSocketDisposed = false;

// Apply the option: dual mode (this option must be applied before connecting)

if (Socket.AddressFamily == AddressFamily.InterNetworkV6)

Socket.DualMode = OptionDualMode;

// Call the client connecting handler

OnConnecting();

try

{

// Connect to the server

Socket.Connect(Endpoint);

}

catch (SocketException ex)

{

// Call the client error handler

SendError(ex.SocketErrorCode);

// Reset event args

_connectEventArg.Completed -= OnAsyncCompleted;

// Call the client disconnecting handler

OnDisconnecting();

// Close the client socket

Socket.Close();

// Dispose the client socket

Socket.Dispose();

// Dispose event arguments

_connectEventArg.Dispose();

// Call the client disconnected handler

OnDisconnected();

return false;

}

// Apply the option: keep alive

if (OptionKeepAlive)

Socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.KeepAlive, true);

// Apply the option: no delay

if (OptionNoDelay)

Socket.SetSocketOption(SocketOptionLevel.Tcp, SocketOptionName.NoDelay, true);

// Prepare receive & send buffers

_receiveBuffer.Reserve(OptionReceiveBufferSize);

_sendBufferMain.Reserve(OptionSendBufferSize);

_sendBufferFlush.Reserve(OptionSendBufferSize);

// Reset statistic

BytesPending = 0;

BytesSending = 0;

BytesSent = 0;

BytesReceived = 0;

// Update the connected flag

IsConnected = true;

// Call the client connected handler

OnConnected();

try

{

// Create SSL stream

_sslStreamId = Guid.NewGuid();

_sslStream = (Context.CertificateValidationCallback != null) ? new SslStream(new NetworkStream(Socket, false), false, Context.CertificateValidationCallback) : new SslStream(new NetworkStream(Socket, false), false);

// Call the session handshaking handler

OnHandshaking();

// SSL handshake

if (Context.Certificates != null)

_sslStream.AuthenticateAsClient(Address, Context.Certificates, Context.Protocols, true);

else if (Context.Certificate != null)

_sslStream.AuthenticateAsClient(Address, new X509CertificateCollection(new[] { Context.Certificate }), Context.Protocols, true);

else

_sslStream.AuthenticateAsClient(Address);

}

catch (Exception)

{

SendError(SocketError.NotConnected);

DisconnectAsync();

return false;

}

// Update the handshaked flag

IsHandshaked = true;

// Call the session handshaked handler

OnHandshaked();

// Call the empty send buffer handler

if (_sendBufferMain.IsEmpty)

OnEmpty();

return true;

}

/// <summary>

/// Disconnect the client (synchronous)

/// </summary>

/// <returns>'true' if the client was successfully disconnected, 'false' if the client is already disconnected</returns>

public virtual bool Disconnect()

{

if (!IsConnected && !IsConnecting)

return false;

// Cancel connecting operation

if (IsConnecting)

Socket.CancelConnectAsync(_connectEventArg);

if (_disconnecting)

return false;

// Reset connecting & handshaking flags

IsConnecting = false;

IsHandshaking = false;

// Update the disconnecting flag

_disconnecting = true;

// Reset event args

_connectEventArg.Completed -= OnAsyncCompleted;

// Call the client disconnecting handler

OnDisconnecting();

try

{

try

{

// Shutdown the SSL stream

_sslStream.ShutdownAsync().Wait();

}

catch (Exception) {}

// Dispose the SSL stream & buffer

_sslStream.Dispose();

_sslStreamId = null;

try

{

// Shutdown the socket associated with the client

Socket.Shutdown(SocketShutdown.Both);

}

catch (SocketException) {}

// Close the client socket

Socket.Close();

// Dispose the client socket

Socket.Dispose();

// Dispose event arguments

_connectEventArg.Dispose();

// Update the client socket disposed flag

IsSocketDisposed = true;

}

catch (ObjectDisposedException) {}

// Update the handshaked flag

IsHandshaked = false;

// Update the connected flag

IsConnected = false;

// Update sending/receiving flags

_receiving = false;

_sending = false;

// Clear send/receive buffers

ClearBuffers();

// Call the client disconnected handler

OnDisconnected();

// Reset the disconnecting flag

_disconnecting = false;

return true;

}

/// <summary>

/// Reconnect the client (synchronous)

/// </summary>

/// <returns>'true' if the client was successfully reconnected, 'false' if the client is already reconnected</returns>

public virtual bool Reconnect()

{

if (!Disconnect())

return false;

return Connect();

}

/// <summary>

/// Connect the client (asynchronous)

/// </summary>

/// <returns>'true' if the client was successfully connected, 'false' if the client failed to connect</returns>

public virtual bool ConnectAsync()

{

if (IsConnected || IsHandshaked || IsConnecting || IsHandshaking)

return false;

// Setup buffers

_receiveBuffer = new Buffer();

_sendBufferMain = new Buffer();

_sendBufferFlush = new Buffer();

// Setup event args

_connectEventArg = new SocketAsyncEventArgs();

_connectEventArg.RemoteEndPoint = Endpoint;

_connectEventArg.Completed += OnAsyncCompleted;

// Create a new client socket

Socket = CreateSocket();

// Update the client socket disposed flag

IsSocketDisposed = false;

// Apply the option: dual mode (this option must be applied before connecting)

if (Socket.AddressFamily == AddressFamily.InterNetworkV6)

Socket.DualMode = OptionDualMode;

// Update the connecting flag

IsConnecting = true;

// Call the client connecting handler

OnConnecting();

// Async connect to the server

if (!Socket.ConnectAsync(_connectEventArg))

ProcessConnect(_connectEventArg);

return true;

}

/// <summary>

/// Disconnect the client (asynchronous)

/// </summary>

/// <returns>'true' if the client was successfully disconnected, 'false' if the client is already disconnected</returns>

public virtual bool DisconnectAsync() { return Disconnect(); }

/// <summary>

/// Reconnect the client (asynchronous)

/// </summary>

/// <returns>'true' if the client was successfully reconnected, 'false' if the client is already reconnected</returns>

public virtual bool ReconnectAsync()

{

if (!DisconnectAsync())

return false;

while (IsConnected)

Thread.Yield();

return ConnectAsync();

}

#endregion

#region Send/Recieve data

// Receive buffer

private bool _receiving;

private Buffer _receiveBuffer;

// Send buffer

private readonly object _sendLock = new object();

private bool _sending;

private Buffer _sendBufferMain;

private Buffer _sendBufferFlush;

private long _sendBufferFlushOffset;

/// <summary>

/// Send data to the server (synchronous)

/// </summary>

/// <param name="buffer">Buffer to send</param>

/// <returns>Size of sent data</returns>

public virtual long Send(byte[] buffer) { return Send(buffer, 0, buffer.Length); }

/// <summary>

/// Send data to the server (synchronous)

/// </summary>

/// <param name="buffer">Buffer to send</param>

/// <param name="offset">Buffer offset</param>

/// <param name="size">Buffer size</param>

/// <returns>Size of sent data</returns>

public virtual long Send(byte[] buffer, long offset, long size)

{

if (!IsHandshaked)

return 0;

if (size == 0)

return 0;

try

{

// Sent data to the server

_sslStream.Write(buffer, (int)offset, (int)size);

// Update statistic

BytesSent += size;

// Call the buffer sent handler

OnSent(size, BytesPending + BytesSending);

return size;

}

catch (Exception)

{

SendError(SocketError.OperationAborted);

Disconnect();

return 0;

}

/// <summary>

/// Send text to the server (synchronous)

/// </summary>

/// <param name="text">Text string to send</param>

/// <returns>Size of sent text</returns>

public virtual long Send(string text) { return Send(Encoding.UTF8.GetBytes(text)); }

/// <summary>

/// Send data to the server (asynchronous)

/// </summary>

/// <param name="buffer">Buffer to send</param>

/// <returns>'true' if the data was successfully sent, 'false' if the client is not connected</returns>

public virtual bool SendAsync(byte[] buffer) { return SendAsync(buffer, 0, buffer.Length); }

/// <summary>

/// Send data to the server (asynchronous)

/// </summary>

/// <param name="buffer">Buffer to send</param>

/// <param name="offset">Buffer offset</param>

/// <param name="size">Buffer size</param>

/// <returns>'true' if the data was successfully sent, 'false' if the client is not connected</returns>

public virtual bool SendAsync(byte[] buffer, long offset, long size)

{

if (!IsHandshaked)

return false;

if (size == 0)

return true;

lock (_sendLock)

{

// Check the send buffer limit

if (((_sendBufferMain.Size + size) > OptionSendBufferLimit) && (OptionSendBufferLimit > 0))

{

SendError(SocketError.NoBufferSpaceAvailable);

return false;

}

// Fill the main send buffer

_sendBufferMain.Append(buffer, offset, size);

// Update statistic

BytesPending = _sendBufferMain.Size;

// Avoid multiple send handlers

if (_sending)

return true;

else

_sending = true;

// Try to send the main buffer

TrySend();

}

return true;

}

/// <summary>

/// Send text to the server (asynchronous)

/// </summary>

/// <param name="text">Text string to send</param>

/// <returns>'true' if the text was successfully sent, 'false' if the client is not connected</returns>

public virtual bool SendAsync(string text) { return SendAsync(Encoding.UTF8.GetBytes(text)); }

/// <summary>

/// Receive data from the server (synchronous)

/// </summary>

/// <param name="buffer">Buffer to receive</param>

/// <returns>Size of received data</returns>

public virtual long Receive(byte[] buffer) { return Receive(buffer, 0, buffer.Length); }

/// <summary>

/// Receive data from the server (synchronous)

/// </summary>

/// <param name="buffer">Buffer to receive</param>

/// <param name="offset">Buffer offset</param>

/// <param name="size">Buffer size</param>

/// <returns>Size of received data</returns>

public virtual long Receive(byte[] buffer, long offset, long size)

{

if (!IsHandshaked)

return 0;

if (size == 0)

return 0;

try

{

// Receive data from the server

long received = _sslStream.Read(buffer, (int)offset, (int)size);

if (received > 0)

{

// Update statistic

BytesReceived += received;

// Call the buffer received handler

OnReceived(buffer, 0, received);

}

return received;

}

catch (Exception)

{

SendError(SocketError.OperationAborted);

Disconnect();

return 0;

}

/// <summary>

/// Receive text from the server (synchronous)

/// </summary>

/// <param name="size">Text size to receive</param>

/// <returns>Received text</returns>

public virtual string Receive(long size)

{

var buffer = new byte[size];

var length = Receive(buffer);

return Encoding.UTF8.GetString(buffer, 0, (int)length);

}

/// <summary>

/// Receive data from the server (asynchronous)

/// </summary>

public virtual void ReceiveAsync()

{

// Try to receive data from the server

TryReceive();

}

/// <summary>

/// Try to receive new data

/// </summary>

private void TryReceive()

{

if (_receiving)

return;

if (!IsHandshaked)

return;

try

{

// Async receive with the receive handler

IAsyncResult result;

{

if (!IsHandshaked)

return;

_receiving = true;

result = _sslStream.BeginRead(_receiveBuffer.Data, 0, (int)_receiveBuffer.Capacity, ProcessReceive, _sslStreamId);

} while (result.CompletedSynchronously);

}

catch (ObjectDisposedException) {}

}

/// <summary>

/// Try to send pending data

/// </summary>

private void TrySend()

{

if (!IsHandshaked)

return;

bool empty = false;

lock (_sendLock)

{

// Is previous socket send in progress?

if (_sendBufferFlush.IsEmpty)

{

// Swap flush and main buffers

_sendBufferFlush = Interlocked.Exchange(ref _sendBufferMain, _sendBufferFlush);

_sendBufferFlushOffset = 0;

// Update statistic

BytesPending = 0;

BytesSending += _sendBufferFlush.Size;

// Check if the flush buffer is empty

if (_sendBufferFlush.IsEmpty)

{

// Need to call empty send buffer handler

empty = true;

// End sending process

_sending = false;

}

else

return;

}

// Call the empty send buffer handler

if (empty)

{

OnEmpty();

return;

}

try

{

// Async write with the write handler

_sslStream.BeginWrite(_sendBufferFlush.Data, (int)_sendBufferFlushOffset, (int)(_sendBufferFlush.Size - _sendBufferFlushOffset), ProcessSend, _sslStreamId);

}

catch (ObjectDisposedException) {}

}

/// <summary>

/// Clear send/receive buffers

/// </summary>

private void ClearBuffers()

{

lock (_sendLock)

{

// Clear send buffers

_sendBufferMain.Clear();

_sendBufferFlush.Clear();

_sendBufferFlushOffset= 0;

// Update statistic

BytesPending = 0;

BytesSending = 0;

}

#endregion

#region IO processing

/// <summary>

/// This method is called whenever a receive or send operation is completed on a socket

/// </summary>

private void OnAsyncCompleted(object sender, SocketAsyncEventArgs e)

{

if (IsSocketDisposed)

return;

// Determine which type of operation just completed and call the associated handler

switch (e.LastOperation)

{

case SocketAsyncOperation.Connect:

ProcessConnect(e);

break;

default:

throw new ArgumentException("The last operation completed on the socket was not a receive or send");

}

/// <summary>

/// This method is invoked when an asynchronous connect operation completes

/// </summary>

private void ProcessConnect(SocketAsyncEventArgs e)

{

IsConnecting = false;

if (e.SocketError == SocketError.Success)

{

// Apply the option: keep alive

if (OptionKeepAlive)

Socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.KeepAlive, true);

// Apply the option: no delay

if (OptionNoDelay)

Socket.SetSocketOption(SocketOptionLevel.Tcp, SocketOptionName.NoDelay, true);

// Prepare receive & send buffers

_receiveBuffer.Reserve(OptionReceiveBufferSize);

_sendBufferMain.Reserve(OptionSendBufferSize);

_sendBufferFlush.Reserve(OptionSendBufferSize);

// Reset statistic

BytesPending = 0;

BytesSending = 0;

BytesSent = 0;

BytesReceived = 0;

// Update the connected flag

IsConnected = true;

// Call the client connected handler

OnConnected();

try

{

// Create SSL stream

_sslStreamId = Guid.NewGuid();

// Call the session handshaking handler

OnHandshaking();

// Begin the SSL handshake

IsHandshaking = true;

if (Context.Certificates != null)

_sslStream.BeginAuthenticateAsClient(Address, Context.Certificates, Context.Protocols, true, ProcessHandshake, _sslStreamId);

else if (Context.Certificate != null)

_sslStream.BeginAuthenticateAsClient(Address, new X509CertificateCollection(new[] { Context.Certificate }), Context.Protocols, true, ProcessHandshake, _sslStreamId);

else

_sslStream.BeginAuthenticateAsClient(Address, ProcessHandshake, _sslStreamId);

}

catch (Exception)

{

SendError(SocketError.NotConnected);

DisconnectAsync();

}

else

{

// Call the client disconnected handler

SendError(e.SocketError);

OnDisconnected();

}

/// <summary>

/// This method is invoked when an asynchronous handshake operation completes

/// </summary>

private void ProcessHandshake(IAsyncResult result)

{

try

{

IsHandshaking = false;

if (IsHandshaked)

return;

// Validate SSL stream Id

var sslStreamId = result.AsyncState as Guid?;

if (_sslStreamId != sslStreamId)

return;

// End the SSL handshake

_sslStream.EndAuthenticateAsClient(result);

// Update the handshaked flag

IsHandshaked = true;

// Try to receive something from the server

TryReceive();

// Check the socket disposed state: in some rare cases it might be disconnected while receiving!

if (IsSocketDisposed)

return;

// Call the session handshaked handler

OnHandshaked();

// Call the empty send buffer handler

if (_sendBufferMain.IsEmpty)

OnEmpty();

}

catch (Exception)

{

SendError(SocketError.NotConnected);

DisconnectAsync();

}

/// <summary>

/// This method is invoked when an asynchronous receive operation completes

/// </summary>

private void ProcessReceive(IAsyncResult result)

{

try

{

if (!IsHandshaked)

return;

// Validate SSL stream Id

var sslStreamId = result.AsyncState as Guid?;

if (_sslStreamId != sslStreamId)

return;

// End the SSL read

long size = _sslStream.EndRead(result);

// Received some data from the server

if (size > 0)

{

// Update statistic

BytesReceived += size;

// Call the buffer received handler

OnReceived(_receiveBuffer.Data, 0, size);

// If the receive buffer is full increase its size

if (_receiveBuffer.Capacity == size)

{

// Check the receive buffer limit

if (((2 * size) > OptionReceiveBufferLimit) && (OptionReceiveBufferLimit > 0))

{

SendError(SocketError.NoBufferSpaceAvailable);

DisconnectAsync();

return;

}

_receiveBuffer.Reserve(2 * size);

}

_receiving = false;

// If zero is returned from a read operation, the remote end has closed the connection

if (size > 0)

{

if (!result.CompletedSynchronously)

TryReceive();

}

else

DisconnectAsync();

}

catch (Exception)

{

SendError(SocketError.OperationAborted);

DisconnectAsync();

}

/// <summary>

/// This method is invoked when an asynchronous send operation completes

/// </summary>

private void ProcessSend(IAsyncResult result)

{

try

{

if (!IsHandshaked)

return;

// Validate SSL stream Id

var sslStreamId = result.AsyncState as Guid?;

if (_sslStreamId != sslStreamId)

return;

// End the SSL write

_sslStream.EndWrite(result);

long size = _sendBufferFlush.Size;

// Send some data to the server

if (size > 0)

{

// Update statistic

BytesSending -= size;

BytesSent += size;

// Increase the flush buffer offset

_sendBufferFlushOffset += size;

// Successfully send the whole flush buffer

if (_sendBufferFlushOffset == _sendBufferFlush.Size)

{

// Clear the flush buffer

_sendBufferFlush.Clear();

_sendBufferFlushOffset = 0;

}

// Call the buffer sent handler

OnSent(size, BytesPending + BytesSending);

}

// Try to send again if the client is valid

TrySend();

}

catch (Exception)

{

SendError(SocketError.OperationAborted);

DisconnectAsync();

}

#endregion

#region Session handlers

/// <summary>

/// Handle client connecting notification

View remainder of file in raw view

NetCoreServer/source/NetCoreServer/SslClient.cs at master · pythonology/NetCoreServer · GitHub

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