Exemplo n.º 1
0
        /// <summary>
        /// Opens a handle to the driver.
        /// </summary>
        /// <returns></returns>
        public static SafeFileHandle OpenDevice(
            String deviceName,
            bool useAsync
            )
        {
            // Open the handle to the driver
            SafeFileHandle device = Kernel32Import.CreateFile(deviceName,
                                                              Kernel32Import.GENERIC_READ | Kernel32Import.GENERIC_WRITE,
                                                              Kernel32Import.FILE_SHARE_READ | Kernel32Import.FILE_SHARE_WRITE,
                                                              IntPtr.Zero,
                                                              Kernel32Import.OPEN_EXISTING,
                                                              useAsync ? Kernel32Import.FILE_FLAG_OVERLAPPED : 0,
                                                              IntPtr.Zero
                                                              );

            if (device.IsInvalid)
            {
                throw new Win32Exception();
            }

            // Bind the handle to the thread pool if performing asynchronous
            // operation, for later completion
            if (useAsync)
            {
                ThreadPool.BindHandle(device);
            }

            return(device);
        }
Exemplo n.º 2
0
        /// <summary>
        /// Method to initiate a SYNCHRONOUS control command to the driver.
        ///
        /// The device handle MUST have been opened without the async option
        /// set prior to calling this method.
        ///
        /// This overload takes an int input and is used to query the driver
        /// what the mesh role is for this device.
        ///
        /// The main return value of this function is whether the
        /// DeviceIoControl operation succeeded or not; therefore, to determine
        /// if this device is a border router or not, the caller must verify
        /// both the result and the isBorderRouter parameter.
        /// </summary>
        /// <param name="device"></param>
        /// <param name="controlCode"></param>
        public unsafe static bool SynchronousControl(
            SafeFileHandle device,
            int controlCode,
            out bool isBorderRouter
            )
        {
            uint meshRole      = 0;
            uint bytesReturned = 0;  // don't care about this in synchronous I/O
            bool result        = Kernel32Import.DeviceIoControl(device,
                                                                controlCode,
                                                                0,
                                                                sizeof(uint),
                                                                ref meshRole,
                                                                sizeof(uint),
                                                                ref bytesReturned,
                                                                null
                                                                );

            if (result)
            {
                // Record the answer from the driver
                if (meshRole == 1)
                {
                    isBorderRouter = true;
                }
                else
                {
                    isBorderRouter = false;
                }
            }
            else
            {
                isBorderRouter = false;
            }


            // Close the driver handle
            Kernel32Import.CloseHandle(device);

            return(result);
        }
Exemplo n.º 3
0
        /// <summary>
        /// Method to initiate a SYNCHRONOUS control command to the driver.
        ///
        /// The device handle MUST have been opened without the async option
        /// set prior to calling this method.
        ///
        /// This overload does not take any input and is used only in the
        /// list purge IOCTLs that have no input or output.
        /// </summary>
        /// <param name="device"></param>
        /// <param name="controlCode"></param>
        public unsafe static bool SynchronousControl(
            SafeFileHandle device,
            int controlCode
            )
        {
            uint bytesReturned = 0;  // don't care about this in synchronous I/O
            bool result        = Kernel32Import.DeviceIoControl(device,
                                                                controlCode,
                                                                new byte[0],
                                                                0,
                                                                new byte[0],
                                                                0,
                                                                ref bytesReturned,
                                                                null
                                                                );

            // Close the driver handle
            Kernel32Import.CloseHandle(device);

            return(result);
        }
Exemplo n.º 4
0
        /// <summary>
        /// Method to initiate a SYNCHRONOUS control command to the driver.
        ///
        /// The device handle MUST have been opened without the async option
        /// set prior to calling this method.
        ///
        /// This overload takes a string input and is used for list operations.
        /// </summary>
        /// <param name="device"></param>
        /// <param name="controlCode"></param>
        public unsafe static bool SynchronousControl(
            SafeFileHandle device,
            int controlCode,
            String ipv6Address
            )
        {
            uint bytesReturned = 0;  // don't care about this in synchronous I/O
            bool result        = Kernel32Import.DeviceIoControl(device,
                                                                controlCode,
                                                                ipv6Address,
                                                                sizeof(char) * ipv6Address.Length,
                                                                null,
                                                                0,
                                                                ref bytesReturned,
                                                                null
                                                                );

            // Close the driver handle
            Kernel32Import.CloseHandle(device);

            return(result);
        }
Exemplo n.º 5
0
        /// <summary>
        /// Helper method that actually sends the given IOCTL to the driver by
        /// calling the native DeviceIOControl() function. Called by AsyncControl().
        /// </summary>
        private static unsafe void NativeAsyncControl(
            SafeFileHandle device,
            int controlCode,
            SafePinnedObject outBuffer,
            ref uint bytesReturned,
            NativeOverlapped *nativeOverlapped
            )
        {
            bool succeeded = Kernel32Import.DeviceIoControl(device,
                                                            controlCode,
                                                            null,
                                                            0,
                                                            outBuffer,
                                                            outBuffer.Size,
                                                            ref bytesReturned,
                                                            nativeOverlapped
                                                            );

            // If DeviceIoControl returns TRUE, the operation completed
            // synchronously
            if (succeeded)
            {
                throw new InvalidOperationException($"Async call to DeviceIoControl completed synchronously.");
            }

            // DeviceIoControl is operating asynchronously; test the returned
            // error code to see if it is pending or not
            Int32       error           = Marshal.GetLastWin32Error();
            const Int32 cErrorIOPending = 997;  // system-defined code for pending I/O

            if (error == cErrorIOPending)
            {
                return;
            }

            // Throw an exception if DeviceIoControl fails altogether
            throw new InvalidOperationException($"Control failed with error {error}");
        }