public void SocketShouldBeClosedAndBindShouldEndWhenOnErrorOccurredIsInvoked()
{
_sessionMock.Setup(p => p.IsConnected).Returns(true);
_sessionMock.Setup(p => p.SendMessage(It.IsAny <ChannelOpenMessage>()))
.Callback <Message>(m => _sessionMock.Raise(p => p.ChannelOpenConfirmationReceived += null,
new MessageEventArgs <ChannelOpenConfirmationMessage>(
new ChannelOpenConfirmationMessage(((ChannelOpenMessage)m).LocalChannelNumber,
_remoteWindowSize,
_remotePacketSize,
_remoteChannelNumber))));
_sessionMock.Setup(p => p.WaitOnHandle(It.IsAny <EventWaitHandle>()))
.Callback <WaitHandle>(p => p.WaitOne(Session.Infinite));
var localPortEndPoint = new IPEndPoint(IPAddress.Loopback, 8122);
using (var localPortListener = new AsyncSocketListener(localPortEndPoint))
{
localPortListener.Start();
localPortListener.Connected += socket =>
{
var channel = new ChannelDirectTcpip(_sessionMock.Object,
_localChannelNumber,
_localWindowSize,
_localPacketSize);
channel.Open(_remoteHost, _port, _forwardedPortMock.Object, socket);
var signalSessionErrorOccurredThread =
new Thread(() =>
{
// sleep for a short period to allow channel to actually start receiving from socket
Thread.Sleep(100);
// raise ErrorOccured event on session
_sessionMock.Raise(s => s.ErrorOccured += null,
new ExceptionEventArgs(new SystemException()));
});
signalSessionErrorOccurredThread.Start();
channel.Bind();
signalSessionErrorOccurredThread.Join();
};
var client = new Socket(localPortEndPoint.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
client.Connect(localPortEndPoint);
// attempt to receive from socket to verify it was shut down by channel
var buffer = new byte[16];
var bytesReceived = client.Receive(buffer, 0, buffer.Length, SocketFlags.None);
Assert.AreEqual(0, bytesReceived);
Assert.IsTrue(client.Connected);
// signal to server that we also shut down the socket at our end
client.Shutdown(SocketShutdown.Send);
}
}
private void HandleSocks4(Socket socket, ChannelDirectTcpip channel)
{
using (var stream = new NetworkStream(socket))
{
var commandCode = stream.ReadByte();
// TODO: See what need to be done depends on the code
var portBuffer = new byte[2];
stream.Read(portBuffer, 0, portBuffer.Length);
var port = (uint)(portBuffer[0] * 256 + portBuffer[1]);
var ipBuffer = new byte[4];
stream.Read(ipBuffer, 0, ipBuffer.Length);
var ipAddress = new IPAddress(ipBuffer);
var username = ReadString(stream);
var host = ipAddress.ToString();
this.RaiseRequestReceived(host, port);
channel.Open(host, port, socket);
stream.WriteByte(0x00);
if (channel.IsOpen)
{
stream.WriteByte(0x5a);
}
else
{
stream.WriteByte(0x5b);
}
stream.Write(portBuffer, 0, portBuffer.Length);
stream.Write(ipBuffer, 0, ipBuffer.Length);
}
}
private void Arrange()
{
var random = new Random();
_localChannelNumber = (uint)random.Next(0, int.MaxValue);
_localWindowSize = (uint)random.Next(2000, 3000);
_localPacketSize = (uint)random.Next(1000, 2000);
_remoteHost = random.Next().ToString(CultureInfo.InvariantCulture);
_port = (uint)random.Next(IPEndPoint.MinPort, IPEndPoint.MaxPort);
_channelBindFinishedWaitHandle = new ManualResetEvent(false);
_clientReceivedFinishedWaitHandle = new ManualResetEvent(false);
_channelException = null;
_remoteChannelNumber = (uint)random.Next(0, int.MaxValue);
_remoteWindowSize = (uint)random.Next(0, int.MaxValue);
_remotePacketSize = (uint)random.Next(100, 200);
_sessionMock = new Mock <ISession>(MockBehavior.Strict);
_forwardedPortMock = new Mock <IForwardedPort>(MockBehavior.Strict);
_connectionInfoMock = new Mock <IConnectionInfo>(MockBehavior.Strict);
var sequence = new MockSequence();
_sessionMock.InSequence(sequence).Setup(p => p.IsConnected).Returns(true);
_sessionMock.InSequence(sequence)
.Setup(p => p.SendMessage(It.Is <ChannelOpenMessage>(m => AssertExpectedMessage(m))));
_sessionMock.InSequence(sequence)
.Setup(p => p.WaitOnHandle(It.IsNotNull <WaitHandle>()))
.Callback <WaitHandle>(
w =>
{
_sessionMock.Raise(
s => s.ChannelOpenConfirmationReceived += null,
new MessageEventArgs <ChannelOpenConfirmationMessage>(
new ChannelOpenConfirmationMessage(
_localChannelNumber,
_remoteWindowSize,
_remotePacketSize,
_remoteChannelNumber)));
w.WaitOne();
});
_sessionMock.InSequence(sequence).Setup(p => p.IsConnected).Returns(true);
_sessionMock.InSequence(sequence)
.Setup(
p => p.TrySendMessage(It.Is <ChannelEofMessage>(m => m.LocalChannelNumber == _remoteChannelNumber)))
.Returns(true);
_sessionMock.InSequence(sequence).Setup(p => p.IsConnected).Returns(true);
_sessionMock.InSequence(sequence)
.Setup(
p => p.TrySendMessage(It.Is <ChannelCloseMessage>(m => m.LocalChannelNumber == _remoteChannelNumber)))
.Returns(true);
_sessionMock.InSequence(sequence)
.Setup(p => p.WaitOnHandle(It.IsNotNull <WaitHandle>()))
.Callback <WaitHandle>(
w =>
{
_sessionMock.Raise(
s => s.ChannelCloseReceived += null,
new MessageEventArgs <ChannelCloseMessage>(new ChannelCloseMessage(_localChannelNumber)));
w.WaitOne();
});
var localEndpoint = new IPEndPoint(IPAddress.Loopback, 8122);
_listener = new AsyncSocketListener(localEndpoint);
_listener.Connected += socket =>
{
try
{
_channel = new ChannelDirectTcpip(
_sessionMock.Object,
_localChannelNumber,
_localWindowSize,
_localPacketSize);
_channel.Open(_remoteHost, _port, _forwardedPortMock.Object, socket);
_channel.Bind();
}
catch (Exception ex)
{
_channelException = ex;
}
finally
{
_channelBindFinishedWaitHandle.Set();
}
};
_listener.Start();
_client = new Socket(localEndpoint.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
_client.Connect(localEndpoint);
var clientReceiveThread = new Thread(
() =>
{
var buffer = new byte[16];
var bytesReceived = _client.Receive(buffer, 0, buffer.Length, SocketFlags.None);
if (bytesReceived == 0)
{
_client.Shutdown(SocketShutdown.Send);
_clientReceivedFinishedWaitHandle.Set();
}
}
);
clientReceiveThread.Start();
// give channel time to bind to socket
Thread.Sleep(200);
}
public void SocketShouldBeClosedAndEofShouldBeSentToServerWhenClientShutsDownSocket()
{
_sessionMock.Setup(p => p.IsConnected).Returns(true);
_sessionMock.Setup(p => p.SendMessage(It.IsAny <ChannelOpenMessage>()))
.Callback <Message>(m => _sessionMock.Raise(p => p.ChannelOpenConfirmationReceived += null,
new MessageEventArgs <ChannelOpenConfirmationMessage>(
new ChannelOpenConfirmationMessage(((ChannelOpenMessage)m).LocalChannelNumber,
_remoteWindowSize, _remotePacketSize, _remoteChannelNumber))));
_sessionMock.Setup(p => p.WaitOnHandle(It.IsAny <EventWaitHandle>()))
.Callback <WaitHandle>(p => p.WaitOne(-1));
_sessionMock.Setup(p => p.TrySendMessage(It.IsAny <ChannelEofMessage>()))
.Returns(true)
.Callback <Message>(
m => new Thread(() =>
{
Thread.Sleep(50);
_sessionMock.Raise(s => s.ChannelEofReceived += null,
new MessageEventArgs <ChannelEofMessage>(new ChannelEofMessage(_localChannelNumber)));
}).Start());
_sessionMock.Setup(p => p.TrySendMessage(It.IsAny <ChannelCloseMessage>()))
.Returns(true)
.Callback <Message>(
m => new Thread(() =>
{
Thread.Sleep(50);
_sessionMock.Raise(s => s.ChannelCloseReceived += null,
new MessageEventArgs <ChannelCloseMessage>(new ChannelCloseMessage(_localChannelNumber)));
}).Start());
var channelBindFinishedWaitHandle = new ManualResetEvent(false);
Socket handler = null;
ChannelDirectTcpip channel = null;
var localPortEndPoint = new IPEndPoint(IPAddress.Loopback, 8122);
using (var localPortListener = new AsyncSocketListener(localPortEndPoint))
{
localPortListener.Start();
localPortListener.Connected += socket =>
{
channel = new ChannelDirectTcpip(_sessionMock.Object, _localChannelNumber, _localWindowSize,
_localPacketSize);
channel.Open(_remoteHost, _port, _forwardedPortMock.Object, socket);
channel.Bind();
channel.Close();
handler = socket;
channelBindFinishedWaitHandle.Set();
};
var client = new Socket(localPortEndPoint.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
client.Connect(localPortEndPoint);
client.Shutdown(SocketShutdown.Send);
Assert.IsFalse(client.Connected);
channelBindFinishedWaitHandle.WaitOne();
Assert.IsNotNull(handler);
Assert.IsFalse(handler.Connected);
_sessionMock.Verify(p => p.TrySendMessage(It.IsAny <ChannelEofMessage>()), Times.Once);
_sessionMock.Verify(p => p.TrySendMessage(It.IsAny <ChannelCloseMessage>()), Times.Once);
channel.Close();
_sessionMock.Verify(p => p.TrySendMessage(It.IsAny <ChannelEofMessage>()), Times.Once);
_sessionMock.Verify(p => p.TrySendMessage(It.IsAny <ChannelCloseMessage>()), Times.Once);
}
}
private void HandleSocks5(Socket socket, ChannelDirectTcpip channel)
{
using (var stream = new NetworkStream(socket))
{
var authenticationMethodsCount = stream.ReadByte();
var authenticationMethods = new byte[authenticationMethodsCount];
stream.Read(authenticationMethods, 0, authenticationMethods.Length);
stream.WriteByte(0x05);
if (authenticationMethods.Min() == 0)
{
stream.WriteByte(0x00);
}
else
{
stream.WriteByte(0xFF);
}
var version = stream.ReadByte();
if (version != 5)
{
throw new ProxyException("SOCKS5: Version 5 is expected.");
}
var commandCode = stream.ReadByte();
if (stream.ReadByte() != 0)
{
throw new ProxyException("SOCKS5: 0 is expected.");
}
var addressType = stream.ReadByte();
IPAddress ipAddress = null;
byte[] addressBuffer = null;
switch (addressType)
{
case 0x01:
{
addressBuffer = new byte[4];
stream.Read(addressBuffer, 0, 4);
ipAddress = new IPAddress(addressBuffer);
}
break;
case 0x03:
{
var length = stream.ReadByte();
addressBuffer = new byte[length];
stream.Read(addressBuffer, 0, addressBuffer.Length);
ipAddress = IPAddress.Parse(new Renci.SshNet.Common.ASCIIEncoding().GetString(addressBuffer));
}
break;
case 0x04:
{
addressBuffer = new byte[16];
stream.Read(addressBuffer, 0, 16);
ipAddress = new IPAddress(addressBuffer);
}
break;
default:
throw new ProxyException(string.Format("SOCKS5: Address type '{0}' is not supported.", addressType));
}
var portBuffer = new byte[2];
stream.Read(portBuffer, 0, portBuffer.Length);
var port = (uint)(portBuffer[0] * 256 + portBuffer[1]);
var host = ipAddress.ToString();
this.RaiseRequestReceived(host, port);
channel.Open(host, port, socket);
stream.WriteByte(0x05);
if (channel.IsOpen)
{
stream.WriteByte(0x00);
}
else
{
stream.WriteByte(0x01);
}
stream.WriteByte(0x00);
var buffer = ipAddress.GetAddressBytes();
if (ipAddress.AddressFamily == AddressFamily.InterNetwork)
{
stream.WriteByte(0x01);
}
else if (ipAddress.AddressFamily == AddressFamily.InterNetwork)
{
stream.WriteByte(0x04);
}
else
{
throw new NotSupportedException("Not supported address family.");
}
stream.Write(buffer, 0, buffer.Length);
stream.Write(portBuffer, 0, portBuffer.Length);
}
}
