#include "mntmgr.h"
+#define MAX_DEVICES 0x3E8 /* Matches 1000 devices */
+
#define NDEBUG
#include <debug.h>
MountMgrQueryDosVolumePath(IN PDEVICE_EXTENSION DeviceExtension,
IN PIRP Irp)
{
- UNREFERENCED_PARAMETER(DeviceExtension);
- UNREFERENCED_PARAMETER(Irp);
- return STATUS_NOT_IMPLEMENTED;
+ NTSTATUS Status;
+ ULONG DevicesFound;
+ PIO_STACK_LOCATION Stack;
+ PLIST_ENTRY SymlinksEntry;
+ UNICODE_STRING SymbolicName;
+ PMOUNTMGR_TARGET_NAME Target;
+ PWSTR DeviceString, OldBuffer;
+ USHORT DeviceLength, OldLength;
+ PDEVICE_INFORMATION DeviceInformation;
+ PSYMLINK_INFORMATION SymlinkInformation;
+ PASSOCIATED_DEVICE_ENTRY AssociatedDevice;
+
+ Stack = IoGetNextIrpStackLocation(Irp);
+
+ /* Validate input size */
+ if (Stack->Parameters.DeviceIoControl.InputBufferLength < sizeof(MOUNTMGR_TARGET_NAME))
+ {
+ return STATUS_INVALID_PARAMETER;
+ }
+
+ /* Ensure we have received UNICODE_STRING */
+ Target = (PMOUNTMGR_TARGET_NAME)Irp->AssociatedIrp.SystemBuffer;
+ if (Target->DeviceNameLength & 1)
+ {
+ return STATUS_INVALID_PARAMETER;
+ }
+
+ /* Validate the entry structure size */
+ if (Target->DeviceNameLength + sizeof(UNICODE_NULL) > Stack->Parameters.DeviceIoControl.InputBufferLength)
+ {
+ return STATUS_INVALID_PARAMETER;
+ }
+
+ /* Ensure we can at least return needed size */
+ if (Stack->Parameters.DeviceIoControl.OutputBufferLength < sizeof(ULONG))
+ {
+ return STATUS_INVALID_PARAMETER;
+ }
+
+ /* Construct string for query */
+ SymbolicName.Length = Target->DeviceNameLength;
+ SymbolicName.MaximumLength = Target->DeviceNameLength + sizeof(UNICODE_NULL);
+ SymbolicName.Buffer = Target->DeviceName;
+
+ /* Find device with our info */
+ Status = FindDeviceInfo(DeviceExtension, &SymbolicName, FALSE, &DeviceInformation);
+ if (!NT_SUCCESS(Status))
+ {
+ return Status;
+ }
+
+ DeviceLength = 0;
+ DeviceString = NULL;
+ DevicesFound = 0;
+
+ /* Try to find associated device info */
+ while (TRUE)
+ {
+ for (SymlinksEntry = DeviceInformation->SymbolicLinksListHead.Flink;
+ SymlinksEntry != &(DeviceInformation->SymbolicLinksListHead);
+ SymlinksEntry = SymlinksEntry->Flink)
+ {
+ SymlinkInformation = CONTAINING_RECORD(SymlinksEntry, SYMLINK_INFORMATION, SymbolicLinksListEntry);
+
+ /* Try to find with drive letter */
+ if (MOUNTMGR_IS_DRIVE_LETTER(&SymlinkInformation->Name) && SymlinkInformation->Online)
+ {
+ break;
+ }
+ }
+
+ /* We didn't find, break */
+ if (SymlinksEntry == &(DeviceInformation->SymbolicLinksListHead))
+ {
+ break;
+ }
+
+ /* It doesn't have associated device, go to fallback method */
+ if (IsListEmpty(&DeviceInformation->AssociatedDevicesHead))
+ {
+ goto TryWithVolumeName;
+ }
+
+ /* Create a string with the information about the device */
+ AssociatedDevice = CONTAINING_RECORD(&(DeviceInformation->SymbolicLinksListHead), ASSOCIATED_DEVICE_ENTRY, AssociatedDevicesEntry);
+ OldLength = DeviceLength;
+ OldBuffer = DeviceString;
+ DeviceLength += AssociatedDevice->String.Length;
+ DeviceString = AllocatePool(DeviceLength);
+ if (!DeviceString)
+ {
+ if (OldBuffer)
+ {
+ FreePool(OldBuffer);
+ }
+
+ return STATUS_INSUFFICIENT_RESOURCES;
+ }
+
+ /* Store our info and previous if any */
+ RtlCopyMemory(DeviceString, AssociatedDevice->String.Buffer, AssociatedDevice->String.Length);
+ if (OldBuffer)
+ {
+ RtlCopyMemory(&DeviceString[AssociatedDevice->String.Length / sizeof(WCHAR)], OldBuffer, OldLength);
+ FreePool(OldBuffer);
+ }
+
+ /* Count and continue looking */
+ ++DevicesFound;
+ DeviceInformation = AssociatedDevice->DeviceInformation;
+
+ /* If too many devices, try another way */
+ if (DevicesFound > MAX_DEVICES) /* 1000 */
+ {
+ goto TryWithVolumeName;
+ }
+ }
+
+ /* Reallocate our string, so that we can prepend disk letter */
+ OldBuffer = DeviceString;
+ OldLength = DeviceLength;
+ DeviceLength += 2 * sizeof(WCHAR);
+ DeviceString = AllocatePool(DeviceLength);
+ if (!DeviceString)
+ {
+ if (OldBuffer)
+ {
+ FreePool(OldBuffer);
+ }
+
+ return STATUS_INSUFFICIENT_RESOURCES;
+ }
+
+ /* Get the letter */
+ DeviceString[0] = SymlinkInformation->Name.Buffer[12];
+ DeviceString[1] = L':';
+
+ /* And copy the rest */
+ if (OldBuffer)
+ {
+ RtlCopyMemory(&DeviceString[2], OldBuffer, OldLength);
+ FreePool(OldBuffer);
+ }
+
+TryWithVolumeName:
+ /* If we didn't find anything, try differently */
+ if (DeviceLength < 2 * sizeof(WCHAR) || DeviceString[2] != L':')
+ {
+ if (DeviceString)
+ {
+ FreePool(DeviceString);
+ DeviceLength = 0;
+ }
+
+ /* Try to find a volume name matching */
+ for (SymlinksEntry = DeviceInformation->SymbolicLinksListHead.Flink;
+ SymlinksEntry != &(DeviceInformation->SymbolicLinksListHead);
+ SymlinksEntry = SymlinksEntry->Flink)
+ {
+ SymlinkInformation = CONTAINING_RECORD(SymlinksEntry, SYMLINK_INFORMATION, SymbolicLinksListEntry);
+
+ if (MOUNTMGR_IS_VOLUME_NAME(&SymlinkInformation->Name))
+ {
+ break;
+ }
+ }
+
+ /* If found copy */
+ if (SymlinksEntry != &(DeviceInformation->SymbolicLinksListHead))
+ {
+ DeviceLength = SymlinkInformation->Name.Length;
+ DeviceString = AllocatePool(DeviceLength);
+ if (!DeviceString)
+ {
+ return STATUS_INSUFFICIENT_RESOURCES;
+ }
+
+ RtlCopyMemory(DeviceString, SymlinkInformation->Name.Buffer, DeviceLength);
+ /* Ensure we are in the right namespace; [1] can be ? */
+ DeviceString[1] = L'\\';
+ }
+ }
+
+ /* If we found something */
+ if (DeviceString)
+ {
+ /* At least, we will return our length */
+ ((PMOUNTMGR_VOLUME_PATHS)Irp->AssociatedIrp.SystemBuffer)->MultiSzLength = DeviceLength;
+ /* MOUNTMGR_VOLUME_PATHS is a string + a ULONG */
+ Irp->IoStatus.Information = DeviceLength + sizeof(ULONG);
+
+ /* If we have enough room for copying the string */
+ if (sizeof(ULONG) + DeviceLength <= Stack->Parameters.DeviceIoControl.OutputBufferLength)
+ {
+ /* Copy it */
+ if (DeviceLength)
+ {
+ RtlCopyMemory(((PMOUNTMGR_VOLUME_PATHS)Irp->AssociatedIrp.SystemBuffer)->MultiSz, DeviceString, DeviceLength);
+ }
+
+ /* And double zero at its end - this is needed in case of multiple paths which are separated by a single 0 */
+ FreePool(DeviceString);
+ ((PMOUNTMGR_VOLUME_PATHS)Irp->AssociatedIrp.SystemBuffer)->MultiSz[DeviceLength / sizeof(WCHAR)] = 0;
+ ((PMOUNTMGR_VOLUME_PATHS)Irp->AssociatedIrp.SystemBuffer)->MultiSz[DeviceLength / sizeof(WCHAR) + 1] = 0;
+
+ return STATUS_SUCCESS;
+ }
+ else
+ {
+ /* Just return appropriate size and leave */
+ FreePool(DeviceString);
+ Irp->IoStatus.Information = sizeof(ULONG);
+ return STATUS_BUFFER_OVERFLOW;
+ }
+ }
+
+ /* Fail */
+ return STATUS_NOT_FOUND;
}
NTSTATUS
projects / reactos.git / blobdiff