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Posted on 2008-09-10 12:28 沒畫完的畫 閱讀(1732) 評論(3) 編輯 收藏 引用 所屬分類: Windows Driver
上一集看 FileDisk 的代碼，沒看出個所以然…… 本集繼續…… 看下 FileDisk 的應用層 Mount 時的實現代碼
 int FileDiskMount(int DeviceNumber, POPEN_FILE_INFORMATION OpenFileInformation, char DriveLetter, BOOLEAN CdImage)
   {
 char VolumeName[] = "\\\\.\\ :";
char DeviceName[255];
HANDLE Device;
DWORD BytesReturned;
VolumeName[4] = DriveLetter;
Device = CreateFile(
VolumeName,
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
FILE_FLAG_NO_BUFFERING,
NULL
);
if (Device != INVALID_HANDLE_VALUE)
  {
SetLastError(ERROR_BUSY);
PrintLastError(&VolumeName[4]);
return -1;
 }
if (CdImage)
{
sprintf(DeviceName, DEVICE_NAME_PREFIX "Cd" "%u", DeviceNumber);
}
else
{
sprintf(DeviceName, DEVICE_NAME_PREFIX "%u", DeviceNumber);
}
if (!DefineDosDevice(
DDD_RAW_TARGET_PATH,
&VolumeName[4],
DeviceName
))
{
PrintLastError(&VolumeName[4]);
return -1;
}
else
{
printf("DefineDosDevice %s %s \n", &VolumeName[4], DeviceName);
}
Device = CreateFile(
VolumeName,
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
FILE_FLAG_NO_BUFFERING,
NULL
);
if (Device == INVALID_HANDLE_VALUE)
{
PrintLastError(&VolumeName[4]);
DefineDosDevice(DDD_REMOVE_DEFINITION, &VolumeName[4], NULL);
return -1;
}
if (!DeviceIoControl(
Device,
IOCTL_FILE_DISK_OPEN_FILE,
OpenFileInformation,
sizeof(OPEN_FILE_INFORMATION) + OpenFileInformation->FileNameLength - 1,
NULL,
0,
&BytesReturned,
NULL
))
{
PrintLastError("FileDisk:");
DefineDosDevice(DDD_REMOVE_DEFINITION, &VolumeName[4], NULL);
return -1;
}
return 0;
 }
在執行 DefineDosDevice() 時，把 傳入 DefineDosDevice() 的參數打印出來看一下先……
顯示結果：
DefineDosDevice e: \Device\FileDisk\FileDisk0
Mount 成功后，用 Winobj.exe 查看，奇怪的是它并沒有在 設備目錄 \GLOBAL??\ 下面生成一個 e: 的別名
問題：應用層的 DefineDosDevice() 不是相當于 驅動層的 IoCreateSymbolicLink() 函數？ 那為何不會生成 e: 這樣的別名，
沒有生成別名，在應用層又是怎么能夠直接訪問 e: 的呢？
--- 迷惘ing
于是在 FileDiskMount() 函數中增加一些語句嘗試一下
int
FileDiskMount(
int DeviceNumber,
POPEN_FILE_INFORMATION OpenFileInformation,
char DriveLetter,
BOOLEAN CdImage
)
{
char VolumeName[] = "\\\\.\\ :";
char DeviceName[255];
HANDLE Device;
DWORD BytesReturned;
VolumeName[4] = DriveLetter;
printf("Enter FileDiskMount \n");
printf("FileDiskMount CreateFile VolumeName = %s\n", VolumeName);
Device = CreateFile(
VolumeName,
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
FILE_FLAG_NO_BUFFERING,
NULL
);
if (Device != INVALID_HANDLE_VALUE)
{
// 這里沒有調用 CloseHandle() 將 Device 關閉 -_-!!
SetLastError(ERROR_BUSY);
PrintLastError(&VolumeName[4]);
return -1;
}
if (CdImage)
{
sprintf(DeviceName, DEVICE_NAME_PREFIX "Cd" "%u", DeviceNumber);
}
else
{
sprintf(DeviceName, DEVICE_NAME_PREFIX "%u", DeviceNumber);
}
printf("FileDiskMount DefineDosDevice VolumeName = %s DeviceName = %s \n", &VolumeName[4], DeviceName);
if (!DefineDosDevice(
DDD_RAW_TARGET_PATH,
&VolumeName[4],
DeviceName
))
{
PrintLastError(&VolumeName[4]);
return -1;
}
printf("FileDiskMount CreateFile VolumeName = %s\n", VolumeName);
Device = CreateFile(
VolumeName,
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
FILE_FLAG_NO_BUFFERING,
NULL
);
if (Device == INVALID_HANDLE_VALUE)
{
PrintLastError(&VolumeName[4]);
DefineDosDevice(DDD_REMOVE_DEFINITION, &VolumeName[4], NULL);
return -1;
}
if (!DeviceIoControl(
Device,
IOCTL_FILE_DISK_OPEN_FILE,
OpenFileInformation,
sizeof(OPEN_FILE_INFORMATION) + OpenFileInformation->FileNameLength - 1,
NULL,
0,
&BytesReturned,
NULL
))
{
PrintLastError("FileDisk:");
DefineDosDevice(DDD_REMOVE_DEFINITION, &VolumeName[4], NULL);
return -1;
}
// 在最后 Device 沒有進行 CloseHandle() ??
return 0;
}
運行 filedisk /mount 之后，輸出結果如下
Enter FileDiskMount
FileDiskMount CreateFile VolumeName = \\.\e:
FileDiskMount DefineDosDevice VolumeName = e: DeviceName = \Device\FileDisk\FileDisk0
FileDiskMount CreateFile VolumeName = \\.\e:
FileDiskMount 的函數先是 用 CreateFile 嘗試打開 \\.\e 這個設備，
確定 e: 這個盤符沒有被占用后，就用 DefineDosDevice() 函數 把 e: 這個盤符指向 \Device\FileDisk\FileDisk0 這個設備
接下來，再用 CreateFile 打開 \\.\e 這個設備
然后調用 DeviceIoControl() 給 \\.\e 這個設備發送 IOCTL_FILE_DISK_OPEN_FILE 這個 Control Code
昨天試過用 DeviceIoControl() 函數，但并未顯示出設備出來
難道調用 DeviceIoControl() 函數后，還需要向這個設備發 IOCTL_FILE_DISK_OPEN_FILE 這個 Control Code ，
“虛擬的分區”才會顯示出來？
于是，決定嘗試下，把后來的向設備發送 IOCTL_FILE_DISK_OPEN_FILE 的相關代碼去掉，
將 FileDiskMount() 的代碼修改為
int
FileDiskMount(
int DeviceNumber,
POPEN_FILE_INFORMATION OpenFileInformation,
char DriveLetter,
BOOLEAN CdImage
)
{
char VolumeName[] = "\\\\.\\ :";
char DeviceName[255];
HANDLE Device;
DWORD BytesReturned;
VolumeName[4] = DriveLetter;
printf("Enter FileDiskMount \n");
printf("FileDiskMount CreateFile VolumeName = %s\n", VolumeName);
Device = CreateFile(
VolumeName,
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
FILE_FLAG_NO_BUFFERING,
NULL
);
if (Device != INVALID_HANDLE_VALUE)
{
SetLastError(ERROR_BUSY);
PrintLastError(&VolumeName[4]);
return -1;
}
if (CdImage)
{
sprintf(DeviceName, DEVICE_NAME_PREFIX "Cd" "%u", DeviceNumber);
}
else
{
sprintf(DeviceName, DEVICE_NAME_PREFIX "%u", DeviceNumber);
}
printf("FileDiskMount DefineDosDevice VolumeName = %s DeviceName = %s \n", &VolumeName[4], DeviceName);
if (!DefineDosDevice(
DDD_RAW_TARGET_PATH,
&VolumeName[4],
DeviceName
))
{
PrintLastError(&VolumeName[4]);
return -1;
}
return 0;
}
運行結果：
C:\Documents and Settings\test>"C:\Documents and Settings\test\桌面\filediskexe.exe" /mount 0 c:\1.txt 9M e:
Enter FileDiskMount
FileDiskMount CreateFile VolumeName = \\.\e:
FileDiskMount DefineDosDevice VolumeName = e: DeviceName = \Device\FileDisk\File
Disk0
仍然可以在我的電腦里顯示 e: 盤這個分區，但雙擊進入時，會有一個錯誤提示“無法訪問 E:\ 設備未就緒。”
昨天試過調用完 DefineDosDevice() 后，在我的電腦里，還是沒有把那個虛擬分區顯示出來，為什么 FileDisk 就可以？
將 FileDiskMount() 再修改為
int
FileDiskMount(
int DeviceNumber,
POPEN_FILE_INFORMATION OpenFileInformation,
char DriveLetter,
BOOLEAN CdImage
)
{
char VolumeName[] = "\\\\.\\ :";
char DeviceName[255];
VolumeName[4] = DriveLetter;
printf("Enter FileDiskMount \n");
if (CdImage)
{
sprintf(DeviceName, DEVICE_NAME_PREFIX "Cd" "%u", DeviceNumber);
}
else
{
sprintf(DeviceName, DEVICE_NAME_PREFIX "%u", DeviceNumber);
}
printf("FileDiskMount DefineDosDevice VolumeName = %s DeviceName = %s \n", &VolumeName[4], DeviceName);
if (!DefineDosDevice(
DDD_RAW_TARGET_PATH,
&VolumeName[4],
DeviceName
))
{
PrintLastError(&VolumeName[4]);
return -1;
}
return 0;
}
運行
C:\Documents and Settings\test>"C:\Documents and Settings\test\桌面\testfilediskexe.exe" /mount 0 c:\1.txt 8M e:
Enter FileDiskMount
FileDiskMount DefineDosDevice VolumeName = e: DeviceName = \Device\FileDisk\File
Disk0
結果還是可以在我的電腦中顯示 e: 盤
昨天沒有把虛擬的分區顯示出來，可能性有2個
1、DefineDosDevice() 的調用有問題
2、FileDisk .sys 在調用了 IoCreateDevice() 之后，還做了其它一些東西，而我沒有注意到
于是，決定再次嘗試下用 DefineDosDevice() 能不能把虛擬的分區顯示出來
.sys 的代碼
#include <ntddk.h>
#include <ntdddisk.h>
#define DEVICE_NAME L"\\DosDevices\\SimpleDriver"
#define SECTOR_SIZE 512
NTSTATUS DriverEntry(IN PDRIVER_OBJECT DriverObject, IN PUNICODE_STRING RegistryPath);
VOID DriverUnload(IN PDRIVER_OBJECT DriverObject);
NTSTATUS DeviceControl(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
NTSTATUS DeviceCreateClose(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
NTSTATUS DeviceReadWrite(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
#pragma code_seg("INIT")
NTSTATUS DriverEntry(IN PDRIVER_OBJECT DriverObject, IN PUNICODE_STRING RegistryPath)
{
NTSTATUS status = STATUS_SUCCESS;
UNICODE_STRING uniNameString;
DEVICE_OBJECT *pCDO = NULL;
KdPrint(("SimpleDriver!DriverEntry \n"));
RtlInitUnicodeString(&uniNameString, DEVICE_NAME);
status = IoCreateDevice(DriverObject, 0, &uniNameString, FILE_DEVICE_DISK_FILE_SYSTEM, FILE_DEVICE_SECURE_OPEN, FALSE, &pCDO);
if( !NT_SUCCESS(status) )
return status;
DriverObject->DriverUnload = DriverUnload;
DriverObject->MajorFunction[IRP_MJ_CREATE] = DeviceCreateClose;
DriverObject->MajorFunction[IRP_MJ_CLOSE] = DeviceCreateClose;
DriverObject->MajorFunction[IRP_MJ_DEVICE_CONTROL] = DeviceControl;
DriverObject->MajorFunction[IRP_MJ_READ] = DeviceReadWrite;
DriverObject->MajorFunction[IRP_MJ_WRITE] = DeviceReadWrite;
return STATUS_SUCCESS;
}
#pragma code_seg("PAGE")
VOID DriverUnload(IN PDRIVER_OBJECT DriverObject)
{
PAGED_CODE();
KdPrint(("SimpleDriver!DriverUnload \n"));
IoDeleteDevice(DriverObject->DeviceObject);
}
NTSTATUS DeviceCreateClose(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp)
{
PAGED_CODE();
KdPrint(("SimpleDriver!DeviceCreateClose \n"));
Irp->IoStatus.Status = STATUS_SUCCESS;
Irp->IoStatus.Information = FILE_OPENED;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return STATUS_SUCCESS;
}
NTSTATUS DeviceControl(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp)
{
NTSTATUS status = STATUS_SUCCESS;
ULONG nIoCtrlCodes = 0; // IO控制碼
PIO_STACK_LOCATION IrpStack = NULL; //IRP堆棧
KdPrint(("SimpleDriver!DeviceControl \n"));
//得到當前調用者的IRP
IrpStack = IoGetCurrentIrpStackLocation(Irp);
nIoCtrlCodes = IrpStack->Parameters.DeviceIoControl.IoControlCode;
KdPrint(("SimpleDriver!DeviceControl IoControlCode = 0x%X\n", nIoCtrlCodes));
switch( IrpStack->Parameters.DeviceIoControl.IoControlCode )
{
case IOCTL_DISK_GET_DRIVE_GEOMETRY:
{
PDISK_GEOMETRY disk_geometry;
ULONGLONG length;
KdPrint(("SimpleDriver!DeviceControl IOCTL_DISK_GET_DRIVE_GEOMETRY \n"));
if (IrpStack->Parameters.DeviceIoControl.OutputBufferLength < sizeof(DISK_GEOMETRY))
{
Irp->IoStatus.Status = STATUS_BUFFER_TOO_SMALL;
Irp->IoStatus.Information = 0;
break;
}
disk_geometry = (PDISK_GEOMETRY) Irp->AssociatedIrp.SystemBuffer;
// #define SECTOR_SIZE 512
disk_geometry->Cylinders.QuadPart = 41940668416 / SECTOR_SIZE / 32 / 2;
disk_geometry->MediaType = FixedMedia;
disk_geometry->TracksPerCylinder = 2;
disk_geometry->SectorsPerTrack = 32;
disk_geometry->BytesPerSector = SECTOR_SIZE;
Irp->IoStatus.Information = sizeof(DISK_GEOMETRY);
Irp->IoStatus.Status = STATUS_SUCCESS;
}
break;
case IOCTL_DISK_GET_PARTITION_INFO:
{
PPARTITION_INFORMATION partition_information;
ULONGLONG length;
KdPrint(("SimpleDriver!DeviceControl IOCTL_DISK_GET_PARTITION_INFO \n"));
if (IrpStack->Parameters.DeviceIoControl.OutputBufferLength < sizeof(PARTITION_INFORMATION))
{
Irp->IoStatus.Status = STATUS_BUFFER_TOO_SMALL;
Irp->IoStatus.Information = 0;
break;
}
partition_information = (PPARTITION_INFORMATION) Irp->AssociatedIrp.SystemBuffer;
partition_information->StartingOffset.QuadPart = 0;
partition_information->PartitionLength.QuadPart = 41940668416;
partition_information->HiddenSectors = 1;
partition_information->PartitionNumber = 0;
partition_information->PartitionType = 0;
partition_information->BootIndicator = FALSE;
partition_information->RecognizedPartition = FALSE;
partition_information->RewritePartition = FALSE;
Irp->IoStatus.Status = STATUS_SUCCESS;
Irp->IoStatus.Information = sizeof(PARTITION_INFORMATION);
}
break;
case IOCTL_DISK_IS_WRITABLE:
{
KdPrint(("SimpleDriver!DeviceControl IOCTL_DISK_IS_WRITABLE \n"));
Irp->IoStatus.Status = STATUS_SUCCESS;
Irp->IoStatus.Information = 0;
break;
}
break;
case IOCTL_DISK_SET_PARTITION_INFO:
{
KdPrint(("SimpleDriver!DeviceControl IOCTL_DISK_SET_PARTITION_INFO \n"));
if (IrpStack->Parameters.DeviceIoControl.InputBufferLength < sizeof(SET_PARTITION_INFORMATION))
{
Irp->IoStatus.Status = STATUS_INVALID_PARAMETER;
Irp->IoStatus.Information = 0;
break;
}
Irp->IoStatus.Status = STATUS_SUCCESS;
Irp->IoStatus.Information = 0;
}
break;
case IOCTL_DISK_VERIFY:
{
PVERIFY_INFORMATION verify_information;
KdPrint(("SimpleDriver!DeviceControl IOCTL_DISK_VERIFY \n"));
if (IrpStack->Parameters.DeviceIoControl.InputBufferLength < sizeof(VERIFY_INFORMATION))
{
Irp->IoStatus.Status = STATUS_INVALID_PARAMETER;
Irp->IoStatus.Information = 0;
break;
}
verify_information = (PVERIFY_INFORMATION) Irp->AssociatedIrp.SystemBuffer;
Irp->IoStatus.Status = STATUS_SUCCESS;
Irp->IoStatus.Information = verify_information->Length;
}
break;
case IOCTL_DISK_CHECK_VERIFY:
{
KdPrint(("SimpleDriver!DeviceControl IOCTL_DISK_CHECK_VERIFY \n"));
Irp->IoStatus.Information = 0;
Irp->IoStatus.Status = STATUS_SUCCESS;
}
break;
};
status = Irp->IoStatus.Status;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return status;
}
NTSTATUS DeviceReadWrite(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp)
{
PIO_STACK_LOCATION io_stack;
io_stack = IoGetCurrentIrpStackLocation(Irp);
if (io_stack->Parameters.Read.Length == 0)
{
Irp->IoStatus.Status = STATUS_SUCCESS;
Irp->IoStatus.Information = 0;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return STATUS_SUCCESS;
}
IoMarkIrpPending(Irp);
return STATUS_PENDING;
}
#pragma code_seg()
.exe 代碼
#include <windows.h>
#include <winioctl.h>
#include <stdio.h>
void mount()
{
if (!DefineDosDevice(DDD_RAW_TARGET_PATH, "e:",
"\\\\.\\SimpleDriver"
))
{
printf("DefineDosDevice Error ErrCode = %d", ::GetLastError());
}
else
{
printf("DefineDosDevice OK ErrCode = %d", ::GetLastError());
}
}
int main(int argc, char *argv[])
{
mount();
return 0;
}
運行結果：
C:\Documents and Settings\test>"C:\Documents and Settings\test\桌面\testDriverTalk.exe"
DefineDosDevice OK ErrCode = 0
但很遺憾?。。。。?e: 盤就是不顯示出來
難道跟設備的路徑有關系？？？
FileDisk 創建的設備路徑是: \Device\FileDisk\File
而上述的SimpleDriver 創建的設備路徑是 \DosDevices\SimpleDriver
于是嘗試將將
.sys 代碼中
#define DEVICE_NAME L"\\DosDevices\\SimpleDriver"
改為:
#define DEVICE_NAME L"\\Device\\SimpleDriver"
編譯……
用 OSRLOADER.exe 加態完驅動后，再用 Winobj.exe 確定了 SimpleDriver 所在的設備路徑是 \Device\SimpleDriver
再加 .exe 的
if (!DefineDosDevice(DDD_RAW_TARGET_PATH, "e:",
"\\\\.\\SimpleDriver"
))
改為
if (!DefineDosDevice(DDD_RAW_TARGET_PATH, "e:",
"\\Device\\SimpleDriver"
))
編譯……，運行
運行結果：
C:\Documents and Settings\test>"C:\Documents and Settings\test\桌面\testDriverTalk.exe"
DefineDosDevice OK ErrCode = 0
恭喜，恭喜?。。。。。。?！
在我的電腦中，E: 這個虛擬的分區終于顯示出來了
如此證明，昨天 調用 DefineDosDevice() 后，E: 盤沒顯示出來，跟 設備的路徑是有關的
但具體原因未知
設備路徑：\DosDevices\SimpleDriver 調用 DefineDosDevice() 后， 不顯示 E: 盤
設備路徑：\Device\SimpleDriver 調用 DefineDosDevice() 后， 顯示 E: 盤
雙擊 E: 盤
提示錯誤信息： “無法訪問 E:\ 函數不正確。”
具體原因不詳， 有可能是 .sys 沒有處理相關 IRP 的原因，需要進一步研究
接下來，想試一下，直接在加載驅動的時候，調用 IoCreateSymbolicLink
修改 .sys 代碼為
#include <ntddk.h>
#include <ntdddisk.h>
#define DEVICE_NAME L"\\Device\\SimpleDriver"
#define DEVICE_LINK_NAME L"\\\\.\\e"
#define SECTOR_SIZE 512
NTSTATUS DriverEntry(IN PDRIVER_OBJECT DriverObject, IN PUNICODE_STRING RegistryPath);
VOID DriverUnload(IN PDRIVER_OBJECT DriverObject);
NTSTATUS DeviceControl(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
NTSTATUS DeviceCreateClose(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
NTSTATUS DeviceReadWrite(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
#pragma code_seg("INIT")
NTSTATUS DriverEntry(IN PDRIVER_OBJECT DriverObject, IN PUNICODE_STRING RegistryPath)
{
NTSTATUS status = STATUS_SUCCESS;
UNICODE_STRING uniNameString;
UNICODE_STRING uniLinkString;
DEVICE_OBJECT *pCDO = NULL;
KdPrint(("SimpleDriver!DriverEntry \n"));
RtlInitUnicodeString(&uniNameString, DEVICE_NAME);
status = IoCreateDevice(DriverObject, 0, &uniNameString, FILE_DEVICE_DISK_FILE_SYSTEM, FILE_DEVICE_SECURE_OPEN, FALSE, &pCDO);
if( !NT_SUCCESS(status) )
return status;
RtlInitUnicodeString(&uniLinkString, DEVICE_LINK_NAME);
status = IoCreateSymbolicLink(&uniLinkString, &uniNameString);
if(!NT_SUCCESS(status))
return status;
DriverObject->DriverUnload = DriverUnload;
DriverObject->MajorFunction[IRP_MJ_CREATE] = DeviceCreateClose;
DriverObject->MajorFunction[IRP_MJ_CLOSE] = DeviceCreateClose;
DriverObject->MajorFunction[IRP_MJ_DEVICE_CONTROL] = DeviceControl;
DriverObject->MajorFunction[IRP_MJ_READ] = DeviceReadWrite;
DriverObject->MajorFunction[IRP_MJ_WRITE] = DeviceReadWrite;
return STATUS_SUCCESS;
}
#pragma code_seg("PAGE")
VOID DriverUnload(IN PDRIVER_OBJECT DriverObject)
{
UNICODE_STRING uniNameString;
PAGED_CODE();
KdPrint(("SimpleDriver!DriverUnload \n"));
RtlInitUnicodeString(&uniNameString, DEVICE_LINK_NAME);
IoDeleteSymbolicLink(&uniNameString);
IoDeleteDevice(DriverObject->DeviceObject);
}
NTSTATUS DeviceCreateClose(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp)
{
PAGED_CODE();
KdPrint(("SimpleDriver!DeviceCreateClose \n"));
Irp->IoStatus.Status = STATUS_SUCCESS;
Irp->IoStatus.Information = FILE_OPENED;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return STATUS_SUCCESS;
}
NTSTATUS DeviceControl(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp)
{
NTSTATUS status = STATUS_SUCCESS;
ULONG nIoCtrlCodes = 0; // IO控制碼
PIO_STACK_LOCATION IrpStack = NULL; //IRP堆棧
KdPrint(("SimpleDriver!DeviceControl \n"));
//得到當前調用者的IRP
IrpStack = IoGetCurrentIrpStackLocation(Irp);
nIoCtrlCodes = IrpStack->Parameters.DeviceIoControl.IoControlCode;
KdPrint(("SimpleDriver!DeviceControl IoControlCode = 0x%X\n", nIoCtrlCodes));
switch( IrpStack->Parameters.DeviceIoControl.IoControlCode )
{
case IOCTL_DISK_GET_DRIVE_GEOMETRY:
{
PDISK_GEOMETRY disk_geometry;
ULONGLONG length;
if (IrpStack->Parameters.DeviceIoControl.OutputBufferLength < sizeof(DISK_GEOMETRY))
{
Irp->IoStatus.Status = STATUS_BUFFER_TOO_SMALL;
Irp->IoStatus.Information = 0;
break;
}
disk_geometry = (PDISK_GEOMETRY) Irp->AssociatedIrp.SystemBuffer;
// #define SECTOR_SIZE 512
disk_geometry->Cylinders.QuadPart = 41940668416 / SECTOR_SIZE / 32 / 2;
disk_geometry->MediaType = FixedMedia;
disk_geometry->TracksPerCylinder = 2;
disk_geometry->SectorsPerTrack = 32;
disk_geometry->BytesPerSector = SECTOR_SIZE;
Irp->IoStatus.Information = sizeof(DISK_GEOMETRY);
Irp->IoStatus.Status = STATUS_SUCCESS;
}
break;
case IOCTL_DISK_GET_PARTITION_INFO:
{
PPARTITION_INFORMATION partition_information;
ULONGLONG length;
if (IrpStack->Parameters.DeviceIoControl.OutputBufferLength < sizeof(PARTITION_INFORMATION))
{
Irp->IoStatus.Status = STATUS_BUFFER_TOO_SMALL;
Irp->IoStatus.Information = 0;
break;
}
partition_information = (PPARTITION_INFORMATION) Irp->AssociatedIrp.SystemBuffer;
partition_information->StartingOffset.QuadPart = 0;
partition_information->PartitionLength.QuadPart = 41940668416;
partition_information->HiddenSectors = 1;
partition_information->PartitionNumber = 0;
partition_information->PartitionType = 0;
partition_information->BootIndicator = FALSE;
partition_information->RecognizedPartition = FALSE;
partition_information->RewritePartition = FALSE;
Irp->IoStatus.Status = STATUS_SUCCESS;
Irp->IoStatus.Information = sizeof(PARTITION_INFORMATION);
}
break;
case IOCTL_DISK_IS_WRITABLE:
{
Irp->IoStatus.Status = STATUS_SUCCESS;
Irp->IoStatus.Information = 0;
break;
}
break;
case IOCTL_DISK_SET_PARTITION_INFO:
{
if (IrpStack->Parameters.DeviceIoControl.InputBufferLength < sizeof(SET_PARTITION_INFORMATION))
{
Irp->IoStatus.Status = STATUS_INVALID_PARAMETER;
Irp->IoStatus.Information = 0;
break;
}
Irp->IoStatus.Status = STATUS_SUCCESS;
Irp->IoStatus.Information = 0;
}
break;
case IOCTL_DISK_VERIFY:
{
PVERIFY_INFORMATION verify_information;
if (IrpStack->Parameters.DeviceIoControl.InputBufferLength < sizeof(VERIFY_INFORMATION))
{
Irp->IoStatus.Status = STATUS_INVALID_PARAMETER;
Irp->IoStatus.Information = 0;
break;
}
verify_information = (PVERIFY_INFORMATION) Irp->AssociatedIrp.SystemBuffer;
Irp->IoStatus.Status = STATUS_SUCCESS;
Irp->IoStatus.Information = verify_information->Length;
}
break;
case IOCTL_DISK_CHECK_VERIFY:
{
Irp->IoStatus.Information = 0;
Irp->IoStatus.Status = STATUS_SUCCESS;
}
break;
};
status = Irp->IoStatus.Status;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return status;
}
NTSTATUS DeviceReadWrite(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp)
{
PIO_STACK_LOCATION io_stack;
io_stack = IoGetCurrentIrpStackLocation(Irp);
if (io_stack->Parameters.Read.Length == 0)
{
Irp->IoStatus.Status = STATUS_SUCCESS;
Irp->IoStatus.Information = 0;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return STATUS_SUCCESS;
}
IoMarkIrpPending(Irp);
return STATUS_PENDING;
}
#pragma code_seg()
使用 OSRLOADER.exe 加載 .sys 時，提示錯誤信息 “文件名、目錄名或卷標語法不正確”，
應該是 #define DEVICE_LINK_NAME L"\\\\.\\e" 這個非法了
嘗試修改為
#define DEVICE_LINK_NAME L"\\.\\e"
加載時提示錯誤信息“系統找不到指定的路徑”，暈，這好像是應用層調用的路徑，
再嘗試修改為
#define DEVICE_NAME L"\\Device\\SimpleDriver"
#define DEVICE_LINK_NAME L"\\DosDevices\\x:"
加載成功
用 Winobj.exe 查看
設備目錄有 \Device\SimpleDriver
也有 \GLOBAL??\X:
但在我的電腦中并沒有顯示 x: 出來
奇怪的地方是 用 DefineDosDevice() 函數不會在 \GLOBAL??\ 下面生成分區的別名，但它又怎么訪問得到呢？
而 使用 IoCreateSymbolicLink() 可以在 \GLOBAL??\ 下生成別名，但在我的電腦中卻又不會顯示
DefineDosDevice() 函數的作用不是相當于 IoCreateSymbolicLink()?
-- 未解決
本集終于可以實現虛擬出一個分區的功能了，但還有很多細節問題需要深入再研究，查找相關資料
問題
1、
設備路徑：\DosDevices\SimpleDriver 調用 DefineDosDevice() 后， 不顯示 E: 盤
設備路徑：\Device\SimpleDriver 調用 DefineDosDevice() 后， 顯示 E: 盤
原因是： 未解決 2、用 DefineDosDevice() 函數不會在 \GLOBAL??\ 下面生成分區的別名，但它又怎么訪問得到呢？ 而 使用 IoCreateSymbolicLink() 可以在 \GLOBAL??\ 下生成別名，但在我的電腦中卻又不會顯示
DefineDosDevice() 函數的作用不是相當于 IoCreateSymbolicLink()?
-- 未解決
--- 6集 完 ---
Feedback
# re: 關于 TrueCrypt 第6集 回復 更多評論
2010-08-28 23:19 by
第一個問題可以回答，\DosDevices\SimpleDriver是符號連接，指向\Device\SimpleDriver，\Device\SimpleDriver才是設備名，DefineDosDevice要用設備名。
第二個問題我現在正在苦惱中，如果在驅動中或者在處理內核進程向驅動發送的IRP過程中使用IoCreateSymbolicLink創建符號連接，這個連接在Global中就能顯示出來，如果在處理用戶進程想驅動發送的IRP過程中使用IoCreateSymbolicLink創建符號連接或者使用DefineDosDevice，這個連接在Global中就顯示不出來（TrueCrypt居然可以，但是我自己仿照truecrypt寫的也不行，直接編譯TrueCrypt代碼沒成功）。
這兩種連接是不同的，好像可以同時創建成功，但是前者在內核中可以使用，后者則不可。比如你加載一個驅動，使用J：這個符號連接路徑，前者可以成功啟動，后者則不行。所以，如果你的驅動在映射的遠程盤上，就會加載失敗。
# re: 關于 TrueCrypt 第6集 回復 更多評論
2010-08-28 23:20 by
# re: 關于 TrueCrypt 第6集 回復 更多評論
2010-08-29 12:33 by
哈哈，終于知道了，用DefineDosDevice定義的符號連接在Session下面，用windbg調試truecrypt驅動終于知道了它是在MountManagerMount中用IoBuildDeviceIoControlRequest實現了global和session下面都有符號連接。
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