dll: Major refactoring: WIP

build/VStudio/winfsp_dll.vcxproj

@@ -25,6 +25,7 @@
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="..\..\src\dll\debug.c" />
+    <ClCompile Include="..\..\src\dll\fsctl.c" />
     <ClCompile Include="..\..\src\dll\library.c" />
     <ClCompile Include="..\..\src\dll\ntstatus.c" />
   </ItemGroup>

build/VStudio/winfsp_dll.vcxproj.filters

@@ -34,6 +34,9 @@
     <ClCompile Include="..\..\src\dll\ntstatus.c">
       <Filter>Source</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\src\dll\fsctl.c">
+      <Filter>Source</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <None Include="..\..\src\dll\ntstatus.i">

src/dll/fsctl.c

@@ -0,0 +1,110 @@
+/**
+ * @file dll/fsctl.c
+ *
+ * @copyright 2015 Bill Zissimopoulos
+ */
+
+#include <dll/library.h>
+
+#define GLOBALROOT                      L"\\\\?\\GLOBALROOT"
+#define PREFIXW                         L"" FSP_FSCTL_VOLUME_PARAMS_PREFIX
+#define PREFIXW_SIZE                    (sizeof PREFIXW - sizeof(WCHAR))
+
+FSP_API NTSTATUS FspFsctlCreateVolume(PWSTR DevicePath,
+    const FSP_FSCTL_VOLUME_PARAMS *VolumeParams,
+    PWCHAR VolumePathBuf, SIZE_T VolumePathSize,
+    PHANDLE PVolumeHandle)
+{
+    NTSTATUS Result;
+    PWSTR DeviceRoot;
+    SIZE_T DeviceRootSize, DevicePathSize;
+    WCHAR DevicePathBuf[MAX_PATH], *DevicePathPtr, *DevicePathEnd;
+    HANDLE VolumeHandle = INVALID_HANDLE_VALUE;
+    DWORD Bytes;
+
+    if (sizeof(WCHAR) <= VolumePathSize)
+        VolumePathBuf[0] = L'\0';
+    *PVolumeHandle = INVALID_HANDLE_VALUE;
+
+    /* check lengths; everything (including encoded volume params) must fit within MAX_PATH */
+    DeviceRoot = L'\\' == DevicePath[0] ? GLOBALROOT : GLOBALROOT "\\Device\\";
+    DeviceRootSize = lstrlenW(DeviceRoot) * sizeof(WCHAR);
+    DevicePathSize = lstrlenW(DevicePath) * sizeof(WCHAR);
+    if (DeviceRootSize + DevicePathSize + PREFIXW_SIZE +
+        sizeof *VolumeParams * sizeof(WCHAR) + sizeof(WCHAR) > sizeof DevicePathBuf)
+        return STATUS_INVALID_PARAMETER;
+
+    /* prepare the device path to be opened; encode the volume params in the Unicode private area */
+    DevicePathPtr = DevicePathBuf;
+    memcpy(DevicePathPtr, DeviceRoot, DeviceRootSize);
+    DevicePathPtr = (PVOID)((PUINT8)DevicePathPtr + DeviceRootSize);
+    memcpy(DevicePathPtr, DevicePath, DevicePathSize);
+    DevicePathPtr = (PVOID)((PUINT8)DevicePathPtr + DevicePathSize);
+    memcpy(DevicePathPtr, PREFIXW, PREFIXW_SIZE);
+    DevicePathPtr = (PVOID)((PUINT8)DevicePathPtr + PREFIXW_SIZE);
+    DevicePathEnd = (PVOID)((PUINT8)DevicePathPtr + sizeof *VolumeParams * sizeof(WCHAR));
+    for (PUINT8 VolumeParamsPtr = (PVOID)VolumeParams;
+        DevicePathEnd > DevicePathPtr; DevicePathPtr++, VolumeParamsPtr++)
+    {
+        WCHAR Value = 0xF000 | *VolumeParamsPtr;
+        *DevicePathPtr = Value;
+    }
+    *DevicePathPtr = L'\0';
+
+    VolumeHandle = CreateFileW(DevicePathBuf,
+        0, FILE_SHARE_READ | FILE_SHARE_WRITE, 0, OPEN_EXISTING, 0, 0);
+    if (INVALID_HANDLE_VALUE == VolumeHandle)
+    {
+        Result = FspNtStatusFromWin32(GetLastError());
+        if (STATUS_OBJECT_NAME_NOT_FOUND == Result)
+            Result = STATUS_NO_SUCH_DEVICE;
+        goto exit;
+    }
+
+    if (!DeviceIoControl(VolumeHandle, FSP_FSCTL_VOLUME_NAME,
+        0, 0,
+        VolumePathBuf, (DWORD)VolumePathSize,
+        &Bytes, 0))
+    {
+        Result = FspNtStatusFromWin32(GetLastError());
+        goto exit;
+    }
+
+    Result = STATUS_SUCCESS;
+
+exit:
+    if (NT_SUCCESS(Result))
+        *PVolumeHandle = VolumeHandle;
+    else
+        CloseHandle(VolumeHandle);
+
+    return Result;
+}
+
+FSP_API NTSTATUS FspFsctlTransact(HANDLE VolumeHandle,
+    PVOID ResponseBuf, SIZE_T ResponseBufSize,
+    PVOID RequestBuf, SIZE_T *PRequestBufSize)
+{
+    NTSTATUS Result = STATUS_SUCCESS;
+    DWORD Bytes = 0;
+
+    if (0 != PRequestBufSize)
+    {
+        Bytes = (DWORD)*PRequestBufSize;
+        *PRequestBufSize = 0;
+    }
+
+    if (!DeviceIoControl(VolumeHandle, FSP_FSCTL_TRANSACT,
+        ResponseBuf, (DWORD)ResponseBufSize, RequestBuf, Bytes,
+        &Bytes, 0))
+    {
+        Result = FspNtStatusFromWin32(GetLastError());
+        goto exit;
+    }
+
+    if (0 != PRequestBufSize)
+        *PRequestBufSize = Bytes;
+
+exit:
+    return Result;
+}

src/dll/library.h

@@ -26,14 +26,6 @@ static inline PVOID MemAlloc(SIZE_T Size)
     extern HANDLE ProcessHeap;
     return HeapAlloc(ProcessHeap, 0, Size);
 }
-static inline PVOID MemAllocSLE(SIZE_T Size)
-{
-    extern HANDLE ProcessHeap;
-    PVOID Pointer = HeapAlloc(ProcessHeap, 0, Size);
-    if (0 == Pointer)
-        SetLastError(ERROR_NO_SYSTEM_RESOURCES);
-    return Pointer;
-}
 static inline VOID MemFree(PVOID Pointer)
 {
     extern HANDLE ProcessHeap;

src/sys/volume.c

@@ -67,7 +67,8 @@ NTSTATUS FspVolumeCreate(
         return STATUS_INVALID_PARAMETER;
 
     /* copy the VolumeParams */
-    for (USHORT Index = 0, Length = FileObject->FileName.Length / 2; Length > Index; Index++)
+    for (USHORT Index = PREFIXW_SIZE / sizeof(WCHAR), Length = FileObject->FileName.Length / 2;
+        Length > Index; Index++)
     {
         WCHAR Value = FileObject->FileName.Buffer[Index];
         if (0xF000 != (Value & 0xFF00))