/************************************************************************
* 文件名稱:Driver.cpp                                                 
* 作    者:張帆
* 完成日期:2007-11-1
*************************************************************************/

#include "Driver.h"

/************************************************************************
* 函數(shù)名稱:DriverEntry
* 功能描述:初始化驅(qū)動(dòng)程序，定位和申請(qǐng)硬件資源，創(chuàng)建內(nèi)核對(duì)象
* 參數(shù)列表:
      pDriverObject:從I/O管理器中傳進(jìn)來的驅(qū)動(dòng)對(duì)象
      pRegistryPath:驅(qū)動(dòng)程序在注冊(cè)表的中的路徑
* 返回 值:返回初始化驅(qū)動(dòng)狀態(tài)
*************************************************************************/
#pragma INITCODE
extern "C" NTSTATUS DriverEntry (
			IN PDRIVER_OBJECT pDriverObject,
			IN PUNICODE_STRING pRegistryPath	) 
{
	NTSTATUS status;
	KdPrint(("Enter DriverEntry\n"));

	//設(shè)置卸載函數(shù)
	pDriverObject->DriverUnload = HelloDDKUnload;

	//設(shè)置派遣函數(shù)
	for (int i = 0; i < arraysize(pDriverObject->MajorFunction); ++i)
		pDriverObject->MajorFunction[i] = HelloDDKDispatchRoutin;

	pDriverObject->MajorFunction[IRP_MJ_DEVICE_CONTROL] = HelloDDKDeviceIOControl;
	
	//創(chuàng)建驅(qū)動(dòng)設(shè)備對(duì)象
	status = CreateDevice(pDriverObject);

	KdPrint(("Leave DriverEntry\n"));
	return status;
}

/************************************************************************
* 函數(shù)名稱:CreateDevice
* 功能描述:初始化設(shè)備對(duì)象
* 參數(shù)列表:
      pDriverObject:從I/O管理器中傳進(jìn)來的驅(qū)動(dòng)對(duì)象
* 返回 值:返回初始化狀態(tài)
*************************************************************************/
#pragma INITCODE
NTSTATUS CreateDevice (
		IN PDRIVER_OBJECT	pDriverObject) 
{
	NTSTATUS status;
	PDEVICE_OBJECT pDevObj;
	PDEVICE_EXTENSION pDevExt;
	
	//創(chuàng)建設(shè)備名稱
	UNICODE_STRING devName;
	RtlInitUnicodeString(&devName,L"\\Device\\MyDDKDevice");
	
	//創(chuàng)建設(shè)備
	status = IoCreateDevice( pDriverObject,
						sizeof(DEVICE_EXTENSION),
						&(UNICODE_STRING)devName,
						FILE_DEVICE_UNKNOWN,
						0, TRUE,
						&pDevObj );
	if (!NT_SUCCESS(status))
		return status;

	pDevObj->Flags |= DO_DIRECT_IO;
	pDevExt = (PDEVICE_EXTENSION)pDevObj->DeviceExtension;
	pDevExt->pDevice = pDevObj;
	pDevExt->ustrDeviceName = devName;

	//申請(qǐng)模擬文件的緩沖區(qū)
	pDevExt->buffer = (PUCHAR)ExAllocatePool(PagedPool,MAX_FILE_LENGTH);
	//設(shè)置模擬文件大小
	pDevExt->file_length = 0;

	//創(chuàng)建符號(hào)鏈接
	UNICODE_STRING symLinkName;
	RtlInitUnicodeString(&symLinkName,L"\\??\\HelloDDK");
	pDevExt->ustrSymLinkName = symLinkName;
	status = IoCreateSymbolicLink( &symLinkName,&devName );
	if (!NT_SUCCESS(status)) 
	{
		IoDeleteDevice( pDevObj );
		return status;
	}
	return STATUS_SUCCESS;
}

/************************************************************************
* 函數(shù)名稱:HelloDDKUnload
* 功能描述:負(fù)責(zé)驅(qū)動(dòng)程序的卸載操作
* 參數(shù)列表:
      pDriverObject:驅(qū)動(dòng)對(duì)象
* 返回 值:返回狀態(tài)
*************************************************************************/
#pragma PAGEDCODE
VOID HelloDDKUnload (IN PDRIVER_OBJECT pDriverObject) 
{
	PDEVICE_OBJECT	pNextObj;
	KdPrint(("Enter DriverUnload\n"));
	pNextObj = pDriverObject->DeviceObject;
	while (pNextObj != NULL) 
	{
		PDEVICE_EXTENSION pDevExt = (PDEVICE_EXTENSION)
			pNextObj->DeviceExtension;
		if (pDevExt->buffer)
		{
			ExFreePool(pDevExt->buffer);
			pDevExt->buffer = NULL;
		}

		//刪除符號(hào)鏈接
		UNICODE_STRING pLinkName = pDevExt->ustrSymLinkName;
		IoDeleteSymbolicLink(&pLinkName);
		pNextObj = pNextObj->NextDevice;
		IoDeleteDevice( pDevExt->pDevice );
	}
}

/************************************************************************
* 函數(shù)名稱:HelloDDKDispatchRoutin
* 功能描述:對(duì)讀IRP進(jìn)行處理
* 參數(shù)列表:
      pDevObj:功能設(shè)備對(duì)象
      pIrp:從IO請(qǐng)求包
* 返回 值:返回狀態(tài)
*************************************************************************/
#pragma PAGEDCODE
NTSTATUS HelloDDKDispatchRoutin(IN PDEVICE_OBJECT pDevObj,
								 IN PIRP pIrp) 
{
	KdPrint(("Enter HelloDDKDispatchRoutin\n"));

	PIO_STACK_LOCATION stack = IoGetCurrentIrpStackLocation(pIrp);
	//建立一個(gè)字符串?dāng)?shù)組與IRP類型對(duì)應(yīng)起來
	static char* irpname[] = 
	{
		"IRP_MJ_CREATE",
		"IRP_MJ_CREATE_NAMED_PIPE",
		"IRP_MJ_CLOSE",
		"IRP_MJ_READ",
		"IRP_MJ_WRITE",
		"IRP_MJ_QUERY_INFORMATION",
		"IRP_MJ_SET_INFORMATION",
		"IRP_MJ_QUERY_EA",
		"IRP_MJ_SET_EA",
		"IRP_MJ_FLUSH_BUFFERS",
		"IRP_MJ_QUERY_VOLUME_INFORMATION",
		"IRP_MJ_SET_VOLUME_INFORMATION",
		"IRP_MJ_DIRECTORY_CONTROL",
		"IRP_MJ_FILE_SYSTEM_CONTROL",
		"IRP_MJ_DEVICE_CONTROL",
		"IRP_MJ_INTERNAL_DEVICE_CONTROL",
		"IRP_MJ_SHUTDOWN",
		"IRP_MJ_LOCK_CONTROL",
		"IRP_MJ_CLEANUP",
		"IRP_MJ_CREATE_MAILSLOT",
		"IRP_MJ_QUERY_SECURITY",
		"IRP_MJ_SET_SECURITY",
		"IRP_MJ_POWER",
		"IRP_MJ_SYSTEM_CONTROL",
		"IRP_MJ_DEVICE_CHANGE",
		"IRP_MJ_QUERY_QUOTA",
		"IRP_MJ_SET_QUOTA",
		"IRP_MJ_PNP",
	};

	UCHAR type = stack->MajorFunction;
	if (type >= arraysize(irpname))
		KdPrint((" - Unknown IRP, major type %X\n", type));
	else
		KdPrint(("\t%s\n", irpname[type]));

	NTSTATUS status = STATUS_SUCCESS;
	// 完成IRP
	pIrp->IoStatus.Status = status;
	pIrp->IoStatus.Information = 0;	// bytes xfered
	IoCompleteRequest( pIrp, IO_NO_INCREMENT );

	KdPrint(("Leave HelloDDKDispatchRoutin\n"));

	return status;
}

#pragma PAGEDCODE
NTSTATUS HelloDDKDeviceIOControl(IN PDEVICE_OBJECT pDevObj,
								 IN PIRP pIrp)
{
	NTSTATUS status = STATUS_SUCCESS;
	KdPrint(("Enter HelloDDKDeviceIOControl\n"));

	//得到當(dāng)前堆棧
	PIO_STACK_LOCATION stack = IoGetCurrentIrpStackLocation(pIrp);
	//得到輸入緩沖區(qū)大小
	ULONG cbin = stack->Parameters.DeviceIoControl.InputBufferLength;
	//得到輸出緩沖區(qū)大小
	ULONG cbout = stack->Parameters.DeviceIoControl.OutputBufferLength;
	//得到IOCTL碼
	ULONG code = stack->Parameters.DeviceIoControl.IoControlCode;

	ULONG info = 0;

	switch (code)
	{						// process request
		case IOCTL_ENABLEDIRECTIO:
		{
			KdPrint(("IOCTL_ENABLEDIRECTIO\n"));
			pIOPM = (UCHAR*)MmAllocateNonCachedMemory(IOPM_SIZE);
			if (pIOPM)
			{
				RtlZeroMemory(pIOPM, IOPM_SIZE);
				Ke386IoSetAccessProcess(PsGetCurrentProcess(), 1);
				Ke386SetIoAccessMap(1, pIOPM);
			}
			else
				pIrp->IoStatus.Status = STATUS_INSUFFICIENT_RESOURCES;
		}
		case IOCTL_DISABLEDIRECTIO:
		{
			KdPrint(("IOCTL_DISABLEDIRECTIO\n"));
			if (pIOPM)
			{
				Ke386IoSetAccessProcess(PsGetCurrentProcess(), 0);
				Ke386SetIoAccessMap(1, pIOPM);

				MmFreeNonCachedMemory(pIOPM, IOPM_SIZE);
				pIOPM = NULL;
			}
		}
		default:
			status = STATUS_INVALID_VARIANT;
	}

	// 完成IRP
	pIrp->IoStatus.Status = status;
	pIrp->IoStatus.Information = info;	// bytes xfered
	IoCompleteRequest( pIrp, IO_NO_INCREMENT );

	KdPrint(("Leave HelloDDKDeviceIOControl\n"));

	return status;
}