/// <summary>
/// Starts the packet diversion with the given number of threads.
/// </summary>
/// <param name="numThreads">
/// The number of threads to use for diversion. If equal to or less than zero, will default
/// to Environment.ProcessorCount.
/// </param>
/// <remarks>
/// The number of threads ought not to exceed Environment.ProcessorCount but this is not
/// enforced with a bounds check.
/// </remarks>
public void Start(int numThreads)
{
lock (m_startStopLock)
{
if (m_running)
{
return;
}
if (numThreads <= 0)
{
numThreads = Environment.ProcessorCount;
}
m_diversionThreads = new List <Thread>();
#if ENGINE_NO_BLOCK_TOR
string mainFilterString = "outbound and tcp and ((ip and ip.SrcAddr != 127.0.0.1) or (ipv6 and ipv6.SrcAddr != ::1))";
#else
string mainFilterString = "outbound and tcp";
#endif
string QUICFilterString = "udp and (udp.DstPort == 80 || udp.DstPort == 443)";
m_diversionHandle = WinDivertMethods.WinDivertOpen(mainFilterString, WINDIVERT_LAYER.WINDIVERT_LAYER_NETWORK, -1000, 0);
if (m_diversionHandle == new IntPtr(-1) || m_diversionHandle == IntPtr.Zero)
{
// Invalid handle value.
throw new Exception(string.Format("Failed to open main diversion handle. Got Win32 error code {0}.", Marshal.GetLastWin32Error()));
}
m_QUICDropHandle = WinDivertMethods.WinDivertOpen(QUICFilterString, WINDIVERT_LAYER.WINDIVERT_LAYER_NETWORK, -999, WinDivertConstants.WINDIVERT_FLAG_DROP);
if (m_QUICDropHandle == new IntPtr(-1) || m_QUICDropHandle == IntPtr.Zero)
{
// Invalid handle value.
throw new Exception(string.Format("Failed to open QUIC diversion handle. Got Win32 error code {0}.", Marshal.GetLastWin32Error()));
}
WinDivertMethods.WinDivertSetParam(m_diversionHandle, WINDIVERT_PARAM.WINDIVERT_PARAM_QUEUE_LEN, 8192);
WinDivertMethods.WinDivertSetParam(m_diversionHandle, WINDIVERT_PARAM.WINDIVERT_PARAM_QUEUE_TIME, 2048);
m_running = true;
for (int i = 0; i < numThreads; ++i)
{
m_diversionThreads.Add(new Thread(() =>
{
RunDiversion();
}));
m_diversionThreads.Last().Start();
}
}
}