public static void Close()
{
if (_driver != null)
{
uint refCount = 0;
_driver.DeviceIOControl(Interop.Ring0.IOCTL_OLS_GET_REFCOUNT, null, ref refCount);
_driver.Close();
if (refCount <= 1)
{
_driver.Delete();
}
_driver = null;
}
if (_isaBusMutex != null)
{
_isaBusMutex.Close();
_isaBusMutex = null;
}
// try to delete temporary driver file again if failed during open
if (_fileName != null && File.Exists(_fileName))
{
try
{
File.Delete(_fileName);
_fileName = null;
}
catch (IOException)
{ }
catch (UnauthorizedAccessException)
{ }
}
}
public static void Open()
{
if (_driver != null)
{
return;
}
// clear the current report
Report.Length = 0;
_driver = new KernelDriver("WinRing0_1_2_0");
_driver.Open();
if (!_driver.IsOpen)
{
// driver is not loaded, try to install and open
_fileName = GetTempFileName();
if (_fileName != null && ExtractDriver(_fileName))
{
if (_driver.Install(_fileName, out string installError))
{
_driver.Open();
if (!_driver.IsOpen)
{
_driver.Delete();
Report.AppendLine("Status: Opening driver failed after install");
}
}
else
{
string errorFirstInstall = installError;
// install failed, try to delete and reinstall
_driver.Delete();
// wait a short moment to give the OS a chance to remove the driver
Thread.Sleep(2000);
if (_driver.Install(_fileName, out string errorSecondInstall))
{
_driver.Open();
if (!_driver.IsOpen)
{
_driver.Delete();
Report.AppendLine("Status: Opening driver failed after reinstall");
}
}
else
{
Report.AppendLine("Status: Installing driver \"" + _fileName + "\" failed" + (File.Exists(_fileName) ? " and file exists" : string.Empty));
Report.AppendLine("First Exception: " + errorFirstInstall);
Report.AppendLine("Second Exception: " + errorSecondInstall);
}
}
}
else
{
Report.AppendLine("Status: Extracting driver failed");
}
try
{
// try to delete the driver file
if (File.Exists(_fileName) && _fileName != null)
{
File.Delete(_fileName);
}
_fileName = null;
}
catch (IOException)
{ }
catch (UnauthorizedAccessException)
{ }
}
if (!_driver.IsOpen)
{
_driver = null;
}
string mutexName = "Global\\Access_ISABUS.HTP.Method";
try
{
#if NETSTANDARD2_0
_isaBusMutex = new Mutex(false, mutexName);
#else
//mutex permissions set to everyone to allow other software to access the hardware
//otherwise other monitoring software cant access
var allowEveryoneRule = new MutexAccessRule(new SecurityIdentifier(WellKnownSidType.WorldSid, null), MutexRights.FullControl, AccessControlType.Allow);
var securitySettings = new MutexSecurity();
securitySettings.AddAccessRule(allowEveryoneRule);
_isaBusMutex = new Mutex(false, mutexName, out _, securitySettings);
#endif
}
catch (UnauthorizedAccessException)
{
try
{
#if NETSTANDARD2_0
_isaBusMutex = Mutex.OpenExisting(mutexName);
#else
_isaBusMutex = Mutex.OpenExisting(mutexName, MutexRights.Synchronize);
#endif
}
catch
{ }
}
}