reactos/dll/win32/fltlib/fltlib.c

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/*
* PROJECT: Filesystem Filter Manager library
* LICENSE: GPL - See COPYING in the top level directory
* FILE: dll/win32/fltlib/fltlib.c
* PURPOSE:
* PROGRAMMERS: Ged Murphy (ged.murphy@reactos.org)
*/
#include <stdarg.h>
#define WIN32_NO_STATUS
#include <windef.h>
#include <winbase.h>
#define NTOS_MODE_USER
#include <ndk/iofuncs.h>
#include <ndk/obfuncs.h>
#include <ndk/rtlfuncs.h>
#include <fltmgr_shared.h>
/* DATA ****************************************************************************/
static
HRESULT
FilterLoadUnload(_In_z_ LPCWSTR lpFilterName,
_In_ BOOL Load);
static
DWORD
SendIoctl(_In_ HANDLE Handle,
_In_ ULONG IoControlCode,
_In_reads_bytes_opt_(BufferSize) LPVOID lpInBuffer,
_In_ DWORD BufferSize);
/* PUBLIC FUNCTIONS ****************************************************************/
_Must_inspect_result_
HRESULT
WINAPI
FilterLoad(_In_ LPCWSTR lpFilterName)
{
return FilterLoadUnload(lpFilterName, TRUE);
}
_Must_inspect_result_
HRESULT
WINAPI
FilterUnload(_In_ LPCWSTR lpFilterName)
{
return FilterLoadUnload(lpFilterName, FALSE);
}
/* PRIVATE FUNCTIONS ****************************************************************/
HRESULT
NtStatusToHResult(_In_ NTSTATUS Status)
{
HRESULT hr;
hr = RtlNtStatusToDosError(Status);
if (hr != ERROR_SUCCESS)
{
hr = (ULONG)hr | 0x80070000;
}
return hr;
}
static
HRESULT
FilterLoadUnload(_In_z_ LPCWSTR lpFilterName,
_In_ BOOL Load)
{
PFILTER_NAME FilterName;
HANDLE hFltMgr;
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SIZE_T StringLength;
SIZE_T BufferLength;
DWORD dwError;
/* Get a handle to the filter manager */
hFltMgr = CreateFileW(L"\\\\.\\fltmgr",
GENERIC_WRITE,
FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
&hFltMgr);
if (hFltMgr == INVALID_HANDLE_VALUE)
{
dwError = GetLastError();
return HRESULT_FROM_WIN32(dwError);
}
/* Calc and allocate a buffer to hold our filter name */
StringLength = wcslen(lpFilterName) * sizeof(WCHAR);
BufferLength = StringLength + sizeof(FILTER_NAME);
FilterName = RtlAllocateHeap(GetProcessHeap(),
0,
BufferLength);
if (FilterName == NULL)
{
CloseHandle(hFltMgr);
return HRESULT_FROM_WIN32(ERROR_OUTOFMEMORY);
}
/* Build up the filter name */
FilterName->Length = StringLength;
CopyMemory(FilterName->FilterName, lpFilterName, StringLength);
/* Tell the filter manager to load the filter for us */
dwError = SendIoctl(hFltMgr,
Load ? IOCTL_FILTER_LOAD : IOCTL_FILTER_UNLOAD,
FilterName,
BufferLength);
/* Cleanup and bail*/
RtlFreeHeap(GetProcessHeap(), 0, FilterName);
CloseHandle(hFltMgr);
return HRESULT_FROM_WIN32(dwError);
}
static
DWORD
SendIoctl(_In_ HANDLE Handle,
_In_ ULONG IoControlCode,
_In_reads_bytes_opt_(BufferSize) LPVOID lpInBuffer,
_In_ DWORD BufferSize)
{
IO_STATUS_BLOCK IoStatusBlock;
NTSTATUS Status;
Status = NtDeviceIoControlFile(Handle,
NULL,
NULL,
NULL,
&IoStatusBlock,
IoControlCode,
lpInBuffer,
BufferSize,
NULL,
0);
if (Status == STATUS_PENDING)
{
Status = NtWaitForSingleObject(Handle, FALSE, NULL);
if (NT_SUCCESS(Status))
{
Status = IoStatusBlock.Status;
}
}
return RtlNtStatusToDosError(Status);
}
BOOL
WINAPI
DllMain(_In_ HINSTANCE hinstDLL,
_In_ DWORD dwReason,
_In_ LPVOID lpvReserved)
{
switch (dwReason)
{
case DLL_PROCESS_ATTACH:
DisableThreadLibraryCalls(hinstDLL);
break;
}
return TRUE;
}