/// <summary>
/// Called whenever the app is shut down with an authorized key, or when the system is
/// shutting down, or when the user is logging off.
/// </summary>
/// <param name="installSafeguards">
/// Indicates whether or not safeguards should be put in place when we exit the application
/// here. Safeguards means that we're going to do all that we can to ensure that our function
/// is not bypassed, and that we're going to be forced to run again.
/// </param>
private void DoCleanShutdown(bool installSafeguards)
{
// No matter what, ensure that all GUI instances for all users are
// immediately shut down, because we, the service, are shutting down.
lock (m_cleanShutdownLock)
{
if (!m_cleanShutdownComplete)
{
try
{
// Pull our critical status.
CriticalKernelProcessUtility.SetMyProcessAsNonKernelCritical();
}
catch (Exception e)
{
LoggerUtil.RecursivelyLogException(m_logger, e);
}
if (installSafeguards)
{
try
{
// Ensure we're automatically running at startup.
var scProcNfo = new ProcessStartInfo("sc.exe");
scProcNfo.UseShellExecute = false;
scProcNfo.WindowStyle = ProcessWindowStyle.Hidden;
scProcNfo.Arguments = "config \"FilterServiceProvider\" start= auto";
Process.Start(scProcNfo).WaitForExit();
}
catch (Exception e)
{
LoggerUtil.RecursivelyLogException(m_logger, e);
}
try
{
var cfg = m_provider.PolicyConfiguration.Configuration;
if (cfg != null && cfg.BlockInternet)
{
// While we're here, let's disable the internet so that the user
// can't browse the web without us. Only do this of course if configured.
try
{
WFPUtility.DisableInternet();
}
catch { }
}
}
catch (Exception e)
{
LoggerUtil.RecursivelyLogException(m_logger, e);
}
}
else
{
// Means that our user got a granted deactivation request, or installed but
// never activated.
m_logger.Info("Shutting down without safeguards.");
}
// Flag that clean shutdown was completed already.
m_cleanShutdownComplete = true;
}
}
}
public void DisableInternet()
{
m_logger.Info("Disabling internet.");
WFPUtility.DisableInternet();
}