由于三键是winlogon在启动时注册的，在原始输入线程(raw input thread）中处理的，
所以很难屏蔽
但是在2k下屏蔽三键的方法还是有不少，常见的是
1、替换GINA
2、进程注入到winlogon
这两种方法在网上已经很普遍了，源代码也可以找到，缺点是容易闪屏，而且处理比较麻烦
理论上还有不少屏蔽方法，在系统消息的各个处理界面将其屏蔽掉即可
我这里介绍的是在kernel mode下处理的方法
在键盘消息到达rit之前进行处理
大部分代码修改自ddk的src
kbfilter.h文件
/*++
Copyright (c) 1997 Microsoft Corporation
Module Name:
kbfilter.h
Abstract:
This module contains the common private declarations for the keyboard
packet filter
Environment:
kernel mode only
Notes:
Revision History:
--*/
#ifndef KBFILTER_H
#define KBFILTER_H
#include "ntddk.h"
#include "kbdmou.h"
#include <ntddkbd.h>
#include <ntdd8042.h>
#define KBFILTER_POOL_TAG (ULONG) 'tlfK'
#undef ExAllocatePool
#define ExAllocatePool(type, size) "
ExAllocatePoolWithTag (type, size, KBFILTER_POOL_TAG)
#if DBG
#define TRAP() DbgBreakPoint()
#define DbgRaiseIrql(_x_,_y_) KeRaiseIrql(_x_,_y_)
#define DbgLowerIrql(_x_) KeLowerIrql(_x_)
#define DebugPrint(_x_) DbgPrint _x_
#else // DBG
#define TRAP()
#define DbgRaiseIrql(_x_,_y_)
#define DbgLowerIrql(_x_)
#define DebugPrint(_x_)
#endif
#define MIN(_A_,_B_) (((_A_) < (_B_)) ? (_A_) : (_B_))
typedef struct _DEVICE_EXTENSION
{
//
// A backpointer to the device object for which this is the extension
//
PDEVICE_OBJECT Self;
//
// "THE PDO" (ejected by the root bus or ACPI)
//
PDEVICE_OBJECT PDO;
//
// The top of the stack before this filter was added. AKA the location
// to which all IRPS should be directed.
//
PDEVICE_OBJECT TopOfStack;
//
// Number of creates sent down
//
LONG EnableCount;
//
// The real connect data that this driver reports to
//
CONNECT_DATA UpperConnectData;
//
// Previous initialization and hook routines (and context)
//
PVOID UpperContext;
PI8042_KEYBOARD_INITIALIZATION_ROUTINE UpperInitializationRoutine;
PI8042_KEYBOARD_ISR UpperIsrHook;
//
// Write function from within KbFilter_IsrHook
//
IN PI8042_ISR_WRITE_PORT IsrWritePort;
//
// Queue the current packet (ie the one passed into KbFilter_IsrHook)
//
IN PI8042_QUEUE_PACKET QueueKeyboardPacket;
//
// Context for IsrWritePort, QueueKeyboardPacket
//
IN PVOID CallContext;
//
// current power state of the device
//
DEVICE_POWER_STATE DeviceState;
BOOLEAN Started;
BOOLEAN SurpriseRemoved;
BOOLEAN Removed;
BOOLEAN CtrlPress;
BOOLEAN AltPress;
} DEVICE_EXTENSION, *PDEVICE_EXTENSION;
//
// Prototypes
//
NTSTATUS
KbFilter_AddDevice(
IN PDRIVER_OBJECT DriverObject,
IN PDEVICE_OBJECT BusDeviceObject
);
NTSTATUS
KbFilter_CreateClose (
IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp
);
NTSTATUS
KbFilter_DispatchPassThrough(
IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp
);
NTSTATUS
KbFilter_InternIoCtl (
IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp
);
NTSTATUS
KbFilter_IoCtl (
IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp
);
NTSTATUS
KbFilter_PnP (
IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp
);
NTSTATUS
KbFilter_Power (
IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp
);
NTSTATUS
KbFilter_InitializationRoutine(
IN PDEVICE_OBJECT DeviceObject, //
InitializationContext
IN PVOID SynchFuncContext,
IN PI8042_SYNCH_READ_PORT ReadPort,
IN PI8042_SYNCH_WRITE_PORT WritePort,
OUT PBOOLEAN TurnTranslationOn
);
BOOLEAN
KbFilter_IsrHook(
PDEVICE_OBJECT DeviceObject, // IsrContext
PKEYBOARD_INPUT_DATA CurrentInput,
POUTPUT_PACKET CurrentOutput,
UCHAR StatusByte,
PUCHAR DataByte,
PBOOLEAN ContinueProcessing,
PKEYBOARD_SCAN_STATE ScanState
);
VOID
KbFilter_ServiceCallback(
IN PDEVICE_OBJECT DeviceObject,
IN PKEYBOARD_INPUT_DATA InputDataStart,
IN PKEYBOARD_INPUT_DATA InputDataEnd,
IN OUT PULONG InputDataConsumed
);
VOID
KbFilter_Unload (
IN PDRIVER_OBJECT DriverObject
);
#endif // KBFILTER_H
kbfiltr.c文件
/*--
Copyright (c) 1998. 1999 Microsoft Corporation
Module Name:
kbfiltr.c
Abstract:
Environment:
Kernel mode only.
Notes:
--*/
#include "kbfiltr.h"
NTSTATUS DriverEntry (PDRIVER_OBJECT, PUNICODE_STRING);
#ifdef ALLOC_PRAGMA
#pragma alloc_text (INIT, DriverEntry)
#pragma alloc_text (PAGE, KbFilter_AddDevice)
#pragma alloc_text (PAGE, KbFilter_CreateClose)
#pragma alloc_text (PAGE, KbFilter_IoCtl)
#pragma alloc_text (PAGE, KbFilter_InternIoCtl)
#pragma alloc_text (PAGE, KbFilter_Unload)
#pragma alloc_text (PAGE, KbFilter_DispatchPassThrough)
#pragma alloc_text (PAGE, KbFilter_PnP)
#pragma alloc_text (PAGE, KbFilter_Power)
#endif
NTSTATUS
DriverEntry (
IN PDRIVER_OBJECT DriverObject,
IN PUNICODE_STRING RegistryPath
)
/*++
Routine Description:
Initialize the entry points of the driver.
--*/
{
ULONG i;
UNREFERENCED_PARAMETER (RegistryPath);
//
// Fill in all the dispatch entry points with the pass through function
// and the explicitly fill in the functions we are going to intercept
//
for (i = 0; i < IRP_MJ_MAXIMUM_FUNCTION; i++) {
DriverObject->MajorFunction[i] = KbFilter_DispatchPassThrough;
}
DriverObject->MajorFunction [IRP_MJ_CREATE] =
DriverObject->MajorFunction [IRP_MJ_CLOSE] = KbFilter_CreateClose;
DriverObject->MajorFunction [IRP_MJ_PNP] = KbFilter_PnP;
DriverObject->MajorFunction [IRP_MJ_POWER] = KbFilter_Power;
DriverObject->MajorFunction [IRP_MJ_INTERNAL_DEVICE_CONTROL] =
KbFilter_InternIoCtl;
//
// If you are planning on using this function, you must create another
// device object to send the requests to. Please see the considerations
// comments for KbFilter_DispatchPassThrough for implementation details.
//
// DriverObject->MajorFunction [IRP_MJ_DEVICE_CONTROL] = KbFilter_IoCtl;
DriverObject->DriverUnload = KbFilter_Unload;
DriverObject->DriverExtension->AddDevice = KbFilter_AddDevice;
return STATUS_SUCCESS;
}
NTSTATUS
KbFilter_AddDevice(
IN PDRIVER_OBJECT Driver,
IN PDEVICE_OBJECT PDO
)
{
PDEVICE_EXTENSION devExt;
IO_ERROR_LOG_PACKET errorLogEntry;
PDEVICE_OBJECT device;
NTSTATUS status = STATUS_SUCCESS;
PAGED_CODE();
status = IoCreateDevice(Driver,
sizeof(DEVICE_EXTENSION),
NULL,
FILE_DEVICE_KEYBOARD,
0,
FALSE,
&device
);
if (!NT_SUCCESS(status)) {
return (status);
}
RtlZeroMemory(device->DeviceExtension, sizeof(DEVICE_EXTENSION));
devExt = (PDEVICE_EXTENSION) device->DeviceExtension;
devExt->TopOfStack = IoAttachDeviceToDeviceStack(device, PDO);
ASSERT(devExt->TopOfStack);
devExt->Self = device;
devExt->PDO = PDO;
devExt->DeviceState = PowerDeviceD0;
devExt->SurpriseRemoved = FALSE;
devExt->Removed = FALSE;
devExt->Started = FALSE;
device->Flags |= (DO_BUFFERED_IO | DO_POWER_PAGABLE);
device->Flags &= ~DO_DEVICE_INITIALIZING;
return status;
}
NTSTATUS
KbFilter_Complete(
IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp,
IN PVOID Context
)
/*++
Routine Description:
Generic completion routine that allows the driver to send the irp down
the
stack, catch it on the way up, and do more processing at the original
IRQL.
--*/
{
PKEVENT event;
event = (PKEVENT) Context;
UNREFERENCED_PARAMETER(DeviceObject);
UNREFERENCED_PARAMETER(Irp);
//
// We could switch on the major and minor functions of the IRP to perform
// different functions, but we know that Context is an event that needs
// to be set.
//
KeSetEvent(event, 0, FALSE);
//
// Allows the caller to use the IRP after it is completed
//
return STATUS_MORE_PROCESSING_REQUIRED;
}
NTSTATUS
KbFilter_CreateClose (
IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp
)
/*++
Routine Description:
Maintain a simple count of the creates and closes sent against this
device
--*/
{
PIO_STACK_LOCATION irpStack;
NTSTATUS status;
PDEVICE_EXTENSION devExt;
PAGED_CODE();
irpStack = IoGetCurrentIrpStackLocation(Irp);
devExt = (PDEVICE_EXTENSION) DeviceObject->DeviceExtension;
status = Irp->IoStatus.Status;
switch (irpStack->MajorFunction) {
case IRP_MJ_CREATE:
if (NULL == devExt->UpperConnectData.ClassService) {
//
// No Connection yet. How can we be enabled?
//
status = STATUS_INVALID_DEVICE_STATE;
}
else if ( 1 == InterlockedIncrement(&devExt->EnableCount)) {
//
// first time enable here
//
}
else {
//
// More than one create was sent down
//
}
break;
case IRP_MJ_CLOSE:
if (0 == InterlockedDecrement(&devExt->EnableCount)) {
//
// successfully closed the device, do any appropriate work here
//
}
break;
}
Irp->IoStatus.Status = status;
//
// Pass on the create and the close
//
return KbFilter_DispatchPassThrough(DeviceObject, Irp);
}
NTSTATUS
KbFilter_DispatchPassThrough(
IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp
)
/*++
Routine Description:
Passes a request on to the lower driver.
Considerations:
If you are creating another device object (to communicate with user mode
via IOCTLs), then this function must act differently based on the
intended
device object. If the IRP is being sent to the solitary device object,
then
this function should just complete the IRP (becuase there is no more
stack
locations below it). If the IRP is being sent to the PnP built stack,
then
the IRP should be passed down the stack.
These changes must also be propagated to all the other IRP_MJ dispatch
functions (create, close, cleanup, etc) as well!
--*/
{
PIO_STACK_LOCATION irpStack = IoGetCurrentIrpStackLocation(Irp);
//
// Pass the IRP to the target
//
IoSkipCurrentIrpStackLocation(Irp);
return IoCallDriver(((PDEVICE_EXTENSION) DeviceObject->DeviceExtension)->T
opOfStack, Irp);
}
NTSTATUS
KbFilter_InternIoCtl(
IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp
)
/*++
Routine Description:
This routine is the dispatch routine for internal device control
requests.
There are two specific control codes that are of interest:
IOCTL_INTERNAL_KEYBOARD_CONNECT:
Store the old context and function pointer and replace it with our
own.
This makes life much simpler than intercepting IRPs sent by the RIT
and
modifying them on the way back up.
IOCTL_INTERNAL_I8042_HOOK_KEYBOARD:
Add in the necessary function pointers and context values so that we
can
alter how the ps/2 keyboard is initialized.
NOTE: Handling IOCTL_INTERNAL_I8042_HOOK_KEYBOARD is *NOT* necessary if
all you want to do is filter KEYBOARD_INPUT_DATAs. You can remove
the handling code and all related device extension fields and
functions to conserve space.
Arguments:
DeviceObject - Pointer to the device object.
Irp - Pointer to the request packet.
Return Value:
Status is returned.
--*/
{
PIO_STACK_LOCATION irpStack;
PDEVICE_EXTENSION devExt;
PINTERNAL_I8042_HOOK_KEYBOARD hookKeyboard;
KEVENT event;
PCONNECT_DATA connectData;
NTSTATUS status = STATUS_SUCCESS;
devExt = (PDEVICE_EXTENSION) DeviceObject->DeviceExtension;
Irp->IoStatus.Information = 0;
irpStack = IoGetCurrentIrpStackLocation(Irp);
switch (irpStack->Parameters.DeviceIoControl.IoControlCode) {
//
// Connect a keyboard class device driver to the port driver.
//
case IOCTL_INTERNAL_KEYBOARD_CONNECT:
//
// Only allow one connection.
//
if (devExt->UpperConnectData.ClassService != NULL) {
status = STATUS_SHARING_VIOLATION;
break;
}
else if (irpStack->Parameters.DeviceIoControl.InputBufferLength <
sizeof(CONNECT_DATA)) {
//
// invalid buffer
//
status = STATUS_INVALID_PARAMETER;
break;
}
//
// Copy the connection parameters to the device extension.
//
connectData = ((PCONNECT_DATA)
(irpStack->Parameters.DeviceIoControl.Type3InputBuffer));
devExt->UpperConnectData = *connectData;
//
// Hook into the report chain. Everytime a keyboard packet is
reported
// to the system, KbFilter_ServiceCallback will be called
//
connectData->ClassDeviceObject = devExt->Self;
connectData->ClassService = KbFilter_ServiceCallback;
break;
//
// Disconnect a keyboard class device driver from the port driver.
//
case IOCTL_INTERNAL_KEYBOARD_DISCONNECT:
//
// Clear the connection parameters in the device extension.
//
// devExt->UpperConnectData.ClassDeviceObject = NULL;
// devExt->UpperConnectData.ClassService = NULL;
status = STATUS_NOT_IMPLEMENTED;
break;
//
// Attach this driver to the initialization and byte processing of the
// i8042 (ie PS/2) keyboard. This is only necessary if you want to do
PS/2
// specific functions, otherwise hooking the CONNECT_DATA is sufficient
//
case IOCTL_INTERNAL_I8042_HOOK_KEYBOARD:
DebugPrint(("hook keyboard received!"n"));
if (irpStack->Parameters.DeviceIoControl.InputBufferLength <
sizeof(INTERNAL_I8042_HOOK_KEYBOARD)) {
DebugPrint(("InternalIoctl error - invalid buffer length"n"));
status = STATUS_INVALID_PARAMETER;
break;
}
hookKeyboard = (PINTERNAL_I8042_HOOK_KEYBOARD)
irpStack->Parameters.DeviceIoControl.Type3InputBuffer;
//
// Enter our own initialization routine and record any Init routine
// that may be above us. Repeat for the isr hook
//
devExt->UpperContext = hookKeyboard->Context;
//
// replace old Context with our own
//
hookKeyboard->Context = (PVOID) DeviceObject;
if (hookKeyboard->InitializationRoutine) {
devExt->UpperInitializationRoutine =
hookKeyboard->InitializationRoutine;
}
hookKeyboard->InitializationRoutine =
(PI8042_KEYBOARD_INITIALIZATION_ROUTINE)
KbFilter_InitializationRoutine;
if (hookKeyboard->IsrRoutine) {
devExt->UpperIsrHook = hookKeyboard->IsrRoutine;
}
hookKeyboard->IsrRoutine = (PI8042_KEYBOARD_ISR) KbFilter_IsrHook;
//
// Store all of the other important stuff
//
devExt->IsrWritePort = hookKeyboard->IsrWritePort;
devExt->QueueKeyboardPacket = hookKeyboard->QueueKeyboardPacket;
devExt->CallContext = hookKeyboard->CallContext;
status = STATUS_SUCCESS;
break;
//
// These internal ioctls are not supported by the new PnP model.
//
#if 0 // obsolete
case IOCTL_INTERNAL_KEYBOARD_ENABLE:
case IOCTL_INTERNAL_KEYBOARD_DISABLE:
status = STATUS_NOT_SUPPORTED;
break;
#endif // obsolete
//
// Might want to capture these in the future. For now, then pass them
down
// the stack. These queries must be successful for the RIT to
communicate
// with the keyboard.
//
case IOCTL_KEYBOARD_QUERY_ATTRIBUTES:
case IOCTL_KEYBOARD_QUERY_INDICATOR_TRANSLATION:
case IOCTL_KEYBOARD_QUERY_INDICATORS:
case IOCTL_KEYBOARD_SET_INDICATORS:
case IOCTL_KEYBOARD_QUERY_TYPEMATIC:
case IOCTL_KEYBOARD_SET_TYPEMATIC:
break;
}
if (!NT_SUCCESS(status)) {
Irp->IoStatus.Status = status;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return status;
}
return KbFilter_DispatchPassThrough(DeviceObject, Irp);
}
NTSTATUS
KbFilter_PnP(
IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp
)
/*++
Routine Description:
This routine is the dispatch routine for plug and play irps
Arguments:
DeviceObject - Pointer to the device object.
Irp - Pointer to the request packet.
Return Value:
Status is returned.
--*/
{
PDEVICE_EXTENSION devExt;
PIO_STACK_LOCATION irpStack;
NTSTATUS status = STATUS_SUCCESS;
KIRQL oldIrql;
KEVENT event;
PAGED_CODE();
devExt = (PDEVICE_EXTENSION) DeviceObject->DeviceExtension;
irpStack = IoGetCurrentIrpStackLocation(Irp);
switch (irpStack->MinorFunction) {
case IRP_MN_START_DEVICE: {
//
// The device is starting.
//
// We cannot touch the device (send it any non pnp irps) until a
// start device has been passed down to the lower drivers.
//
IoCopyCurrentIrpStackLocationToNext(Irp);
KeInitializeEvent(&event,
NotificationEvent,
FALSE
);
IoSetCompletionRoutine(Irp,
(PIO_COMPLETION_ROUTINE) KbFilter_Complete,
&event,
TRUE,
TRUE,
TRUE); // No need for Cancel
status = IoCallDriver(devExt->TopOfStack, Irp);
if (STATUS_PENDING == status) {
KeWaitForSingleObject(
&event,
Executive, // Waiting for reason of a driver
KernelMode, // Waiting in kernel mode
FALSE, // No allert
NULL); // No timeout
}
if (NT_SUCCESS(status) && NT_SUCCESS(Irp->IoStatus.Status)) {
//
// As we are successfully now back from our start device
// we can do work.
//
devExt->Started = TRUE;
devExt->Removed = FALSE;
devExt->SurpriseRemoved = FALSE;
}
//
// We must now complete the IRP, since we stopped it in the
// completetion routine with MORE_PROCESSING_REQUIRED.
//
Irp->IoStatus.Status = status;
Irp->IoStatus.Information = 0;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
break;
}
case IRP_MN_SURPRISE_REMOVAL:
//
// Same as a remove device, but don't call IoDetach or IoDeleteDevice
//
devExt->SurpriseRemoved = TRUE;
// Remove code here
IoSkipCurrentIrpStackLocation(Irp);
status = IoCallDriver(devExt->TopOfStack, Irp);
break;
case IRP_MN_REMOVE_DEVICE:
devExt->Removed = TRUE;
// remove code here
IoSkipCurrentIrpStackLocation(Irp);
IoCallDriver(devExt->TopOfStack, Irp);
IoDetachDevice(devExt->TopOfStack);
IoDeleteDevice(DeviceObject);
status = STATUS_SUCCESS;
break;
case IRP_MN_QUERY_REMOVE_DEVICE:
case IRP_MN_QUERY_STOP_DEVICE:
case IRP_MN_CANCEL_REMOVE_DEVICE:
case IRP_MN_CANCEL_STOP_DEVICE:
case IRP_MN_FILTER_RESOURCE_REQUIREMENTS:
case IRP_MN_STOP_DEVICE:
case IRP_MN_QUERY_DEVICE_RELATIONS:
case IRP_MN_QUERY_INTERFACE:
case IRP_MN_QUERY_CAPABILITIES:
case IRP_MN_QUERY_DEVICE_TEXT:
case IRP_MN_QUERY_RESOURCES:
case IRP_MN_QUERY_RESOURCE_REQUIREMENTS:
case IRP_MN_READ_CONFIG:
case IRP_MN_WRITE_CONFIG:
case IRP_MN_EJECT:
case IRP_MN_SET_LOCK:
case IRP_MN_QUERY_ID:
case IRP_MN_QUERY_PNP_DEVICE_STATE:
default:
//
// Here the filter driver might modify the behavior of these IRPS
// Please see PlugPlay documentation for use of these IRPs.
//
IoSkipCurrentIrpStackLocation(Irp);
status = IoCallDriver(devExt->TopOfStack, Irp);
break;
}
return status;
}
NTSTATUS
KbFilter_Power(
IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp
)
/*++
Routine Description:
This routine is the dispatch routine for power irps Does nothing except
record the state of the device.
Arguments:
DeviceObject - Pointer to the device object.
Irp - Pointer to the request packet.
Return Value:
Status is returned.
--*/
{
PIO_STACK_LOCATION irpStack;
PDEVICE_EXTENSION devExt;
POWER_STATE powerState;
POWER_STATE_TYPE powerType;
PAGED_CODE();
devExt = (PDEVICE_EXTENSION) DeviceObject->DeviceExtension;
irpStack = IoGetCurrentIrpStackLocation(Irp);
powerType = irpStack->Parameters.Power.Type;
powerState = irpStack->Parameters.Power.State;
switch (irpStack->MinorFunction) {
case IRP_MN_SET_POWER:
if (powerType == DevicePowerState) {
devExt->DeviceState = powerState.DeviceState;
}
case IRP_MN_POWER_SEQUENCE:
case IRP_MN_WAIT_WAKE:
case IRP_MN_QUERY_POWER:
default:
break;
}
PoStartNextPowerIrp(Irp);
IoSkipCurrentIrpStackLocation(Irp);
return PoCallDriver(devExt->TopOfStack, Irp);
}
NTSTATUS
KbFilter_InitializationRoutine(
IN PDEVICE_OBJECT DeviceObject,
IN PVOID SynchFuncContext,
IN PI8042_SYNCH_READ_PORT ReadPort,
IN PI8042_SYNCH_WRITE_PORT WritePort,
OUT PBOOLEAN TurnTranslationOn
)
/*++
Routine Description:
This routine gets called after the following has been performed on the kb
1) a reset
2) set the typematic
3) set the LEDs
i8042prt specific code, if you are writing a packet only filter driver,
you
can remove this function
Arguments:
DeviceObject - Context passed during IOCTL_INTERNAL_I8042_HOOK_KEYBOARD
SynchFuncContext - Context to pass when calling Read/WritePort
Read/WritePort - Functions to synchronoulsy read and write to the kb
TurnTranslationOn - If TRUE when this function returns, i8042prt will not
turn on translation on the keyboard
Return Value:
Status is returned.
--*/
{
PDEVICE_EXTENSION devExt;
NTSTATUS status = STATUS_SUCCESS;
devExt = DeviceObject->DeviceExtension;
//
// Do any interesting processing here. We just call any other drivers
// in the chain if they exist. Make Translation is turned on as well
//
if (devExt->UpperInitializationRoutine) {
status = (*devExt->UpperInitializationRoutine) (
devExt->UpperContext,
SynchFuncContext,
ReadPort,
WritePort,
TurnTranslationOn
);
if (!NT_SUCCESS(status)) {
return status;
}
}
*TurnTranslationOn = TRUE;
return status;
}
BOOLEAN
KbFilter_IsrHook(
PDEVICE_OBJECT DeviceObject,
PKEYBOARD_INPUT_DATA CurrentInput,
POUTPUT_PACKET CurrentOutput,
UCHAR StatusByte,
PUCHAR DataByte,
PBOOLEAN ContinueProcessing,
PKEYBOARD_SCAN_STATE ScanState
)
/*++
Routine Description:
This routine gets called at the beginning of processing of the kb
interrupt.
i8042prt specific code, if you are writing a packet only filter driver,
you
can remove this function
Arguments:
DeviceObject - Our context passed during IOCTL_INTERNAL_I8042_HOOK_KEYBOAR
D
CurrentInput - Current input packet being formulated by processing all
the
interrupts
CurrentOutput - Current list of bytes being written to the keyboard or
the
i8042 port.
StatusByte - Byte read from I/O port 60 when the interrupt
occurred
DataByte - Byte read from I/O port 64 when the interrupt occurred.
This value can be modified and i8042prt will use this
value
if ContinueProcessing is TRUE
ContinueProcessing - If TRUE, i8042prt will proceed with normal
processing of
the interrupt. If FALSE, i8042prt will return from
the
interrupt after this function returns. Also, if
FALSE,
it is this functions responsibilityt to report the
input
packet via the function provided in the hook IOCTL
or via
queueing a DPC within this driver and calling the
service callback function acquired from the connect
IOCTL
Return Value:
Status is returned.
--*/
{
PDEVICE_EXTENSION devExt;
BOOLEAN retVal = TRUE;
devExt = DeviceObject->DeviceExtension;
if (devExt->UpperIsrHook) {
retVal = (*devExt->UpperIsrHook) (
devExt->UpperContext,
CurrentInput,
CurrentOutput,
StatusByte,
DataByte,
ContinueProcessing,
ScanState
);
if (!retVal || !(*ContinueProcessing)) {
return retVal;
}
}
*ContinueProcessing = TRUE;
return retVal;
}
VOID
KbFilter_ServiceCallback(
IN PDEVICE_OBJECT DeviceObject,
IN PKEYBOARD_INPUT_DATA InputDataStart,
IN PKEYBOARD_INPUT_DATA InputDataEnd,
IN OUT PULONG InputDataConsumed
)
/*++
Routine Description:
Called when there are keyboard packets to report to the RIT. You can do
anything you like to the packets. For instance:
o Drop a packet altogether
o Mutate the contents of a packet
o Insert packets into the stream
Arguments:
DeviceObject - Context passed during the connect IOCTL
InputDataStart - First packet to be reported
InputDataEnd - One past the last packet to be reported. Total number of
packets is equal to InputDataEnd - InputDataStart
InputDataConsumed - Set to the total number of packets consumed by the
RIT
(via the function pointer we replaced in the connect
IOCTL)
Return Value:
Status is returned.
--*/
{
PDEVICE_EXTENSION devExt;
devExt = (PDEVICE_EXTENSION) DeviceObject->DeviceExtension;
if(InputDataStart->MakeCode == 29 && InputDataStart->Flags == 0)
devExt->CtrlPress = TRUE;
if(InputDataStart->MakeCode == 29 && InputDataStart->Flags == 1)
devExt->CtrlPress = FALSE;
if(InputDataStart->MakeCode == 56 && InputDataStart->Flags == 0)
devExt->AltPress= TRUE;
if(InputDataStart->MakeCode == 56 && InputDataStart->Flags == 1)
devExt->AltPress= FALSE;
if(devExt->CtrlPress == TRUE && devExt->AltPress==TRUE &&
InputDataStart->MakeCode == 83)
{
DebugPrint(("Snap It!!!"n"));
InputDataStart->MakeCode = 1;
}
(*(PSERVICE_CALLBACK_ROUTINE) devExt->UpperConnectData.ClassService)(
devExt->UpperConnectData.ClassDeviceObject,
InputDataStart,
InputDataEnd,
InputDataConsumed);
}
VOID
KbFilter_Unload(
IN PDRIVER_OBJECT Driver
)
/*++
Routine Description:
Free all the allocated resources associated with this driver.
Arguments:
DriverObject - Pointer to the driver object.
Return Value:
None.
--*/
{
PAGED_CODE();
UNREFERENCED_PARAMETER(Driver);
ASSERT(NULL == Driver->DeviceObject);
}