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reactos/ntoskrnl/io/iomgr/deviface.c

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/*
* PROJECT: ReactOS Kernel
* LICENSE: GPL - See COPYING in the top level directory
* FILE: ntoskrnl/io/iomgr/deviface.c
* PURPOSE: Device interface functions
*
* PROGRAMMERS: Filip Navara (xnavara@volny.cz)
* Matthew Brace (ismarc@austin.rr.com)
* Hervé Poussineau (hpoussin@reactos.org)
*/
/* INCLUDES ******************************************************************/
#include <ntoskrnl.h>
#define NDEBUG
#include <debug.h>
/* FIXME: This should be somewhere global instead of having 20 different versions */
#define GUID_STRING_CHARS 38
#define GUID_STRING_BYTES (GUID_STRING_CHARS * sizeof(WCHAR))
C_ASSERT(sizeof(L"{01234567-89ab-cdef-0123-456789abcdef}") == GUID_STRING_BYTES + sizeof(UNICODE_NULL));
/* FUNCTIONS *****************************************************************/
PDEVICE_OBJECT
IopGetDeviceObjectFromDeviceInstance(PUNICODE_STRING DeviceInstance);
static PWCHAR BaseKeyString = L"\\Registry\\Machine\\System\\CurrentControlSet\\Control\\DeviceClasses\\";
static
NTSTATUS
OpenRegistryHandlesFromSymbolicLink(IN PUNICODE_STRING SymbolicLinkName,
IN ACCESS_MASK DesiredAccess,
IN OPTIONAL PHANDLE GuidKey,
IN OPTIONAL PHANDLE DeviceKey,
IN OPTIONAL PHANDLE InstanceKey)
{
OBJECT_ATTRIBUTES ObjectAttributes;
WCHAR PathBuffer[MAX_PATH];
UNICODE_STRING BaseKeyU;
UNICODE_STRING GuidString, SubKeyName, ReferenceString;
PWCHAR StartPosition, EndPosition;
HANDLE ClassesKey;
PHANDLE GuidKeyRealP, DeviceKeyRealP, InstanceKeyRealP;
HANDLE GuidKeyReal, DeviceKeyReal, InstanceKeyReal;
NTSTATUS Status;
SubKeyName.Buffer = NULL;
if (GuidKey != NULL)
GuidKeyRealP = GuidKey;
else
GuidKeyRealP = &GuidKeyReal;
if (DeviceKey != NULL)
DeviceKeyRealP = DeviceKey;
else
DeviceKeyRealP = &DeviceKeyReal;
if (InstanceKey != NULL)
InstanceKeyRealP = InstanceKey;
else
InstanceKeyRealP = &InstanceKeyReal;
*GuidKeyRealP = NULL;
*DeviceKeyRealP = NULL;
*InstanceKeyRealP = NULL;
BaseKeyU.Buffer = PathBuffer;
BaseKeyU.Length = 0;
BaseKeyU.MaximumLength = MAX_PATH * sizeof(WCHAR);
RtlAppendUnicodeToString(&BaseKeyU, BaseKeyString);
/* Open the DeviceClasses key */
InitializeObjectAttributes(&ObjectAttributes,
&BaseKeyU,
OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
NULL,
NULL);
Status = ZwOpenKey(&ClassesKey,
DesiredAccess | KEY_ENUMERATE_SUB_KEYS,
&ObjectAttributes);
if (!NT_SUCCESS(Status))
{
DPRINT1("Failed to open %wZ\n", &BaseKeyU);
goto cleanup;
}
StartPosition = wcschr(SymbolicLinkName->Buffer, L'{');
EndPosition = wcschr(SymbolicLinkName->Buffer, L'}');
if (!StartPosition || !EndPosition || StartPosition > EndPosition)
{
DPRINT1("Bad symbolic link: %wZ\n", SymbolicLinkName);
return STATUS_INVALID_PARAMETER_1;
}
GuidString.Buffer = StartPosition;
GuidString.MaximumLength = GuidString.Length = (USHORT)((ULONG_PTR)(EndPosition + 1) - (ULONG_PTR)StartPosition);
InitializeObjectAttributes(&ObjectAttributes,
&GuidString,
OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
ClassesKey,
NULL);
Status = ZwCreateKey(GuidKeyRealP,
DesiredAccess | KEY_ENUMERATE_SUB_KEYS,
&ObjectAttributes,
0,
NULL,
REG_OPTION_VOLATILE,
NULL);
ZwClose(ClassesKey);
if (!NT_SUCCESS(Status))
{
DPRINT1("Failed to open %wZ%wZ (%x)\n", &BaseKeyU, &GuidString, Status);
goto cleanup;
}
SubKeyName.MaximumLength = SymbolicLinkName->Length + sizeof(WCHAR);
SubKeyName.Length = 0;
SubKeyName.Buffer = ExAllocatePool(PagedPool, SubKeyName.MaximumLength);
if (!SubKeyName.Buffer)
{
Status = STATUS_INSUFFICIENT_RESOURCES;
goto cleanup;
}
RtlAppendUnicodeStringToString(&SubKeyName,
SymbolicLinkName);
SubKeyName.Buffer[SubKeyName.Length / sizeof(WCHAR)] = UNICODE_NULL;
SubKeyName.Buffer[0] = L'#';
SubKeyName.Buffer[1] = L'#';
SubKeyName.Buffer[2] = L'?';
SubKeyName.Buffer[3] = L'#';
ReferenceString.Buffer = wcsrchr(SubKeyName.Buffer, '\\');
if (ReferenceString.Buffer != NULL)
{
ReferenceString.Buffer[0] = L'#';
SubKeyName.Length = (USHORT)((ULONG_PTR)(ReferenceString.Buffer) - (ULONG_PTR)SubKeyName.Buffer);
ReferenceString.Length = SymbolicLinkName->Length - SubKeyName.Length;
}
else
{
RtlInitUnicodeString(&ReferenceString, L"#");
}
InitializeObjectAttributes(&ObjectAttributes,
&SubKeyName,
OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
*GuidKeyRealP,
NULL);
Status = ZwCreateKey(DeviceKeyRealP,
DesiredAccess | KEY_ENUMERATE_SUB_KEYS,
&ObjectAttributes,
0,
NULL,
REG_OPTION_VOLATILE,
NULL);
if (!NT_SUCCESS(Status))
{
DPRINT1("Failed to open %wZ%wZ\\%wZ Status %x\n", &BaseKeyU, &GuidString, &SubKeyName, Status);
goto cleanup;
}
InitializeObjectAttributes(&ObjectAttributes,
&ReferenceString,
OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
*DeviceKeyRealP,
NULL);
Status = ZwCreateKey(InstanceKeyRealP,
DesiredAccess,
&ObjectAttributes,
0,
NULL,
REG_OPTION_VOLATILE,
NULL);
if (!NT_SUCCESS(Status))
{
DPRINT1("Failed to open %wZ%wZ\\%wZ%\\%wZ (%x)\n", &BaseKeyU, &GuidString, &SubKeyName, &ReferenceString, Status);
goto cleanup;
}
Status = STATUS_SUCCESS;
cleanup:
if (SubKeyName.Buffer != NULL)
ExFreePool(SubKeyName.Buffer);
if (NT_SUCCESS(Status))
{
if (!GuidKey)
ZwClose(*GuidKeyRealP);
if (!DeviceKey)
ZwClose(*DeviceKeyRealP);
if (!InstanceKey)
ZwClose(*InstanceKeyRealP);
}
else
{
if (*GuidKeyRealP != NULL)
ZwClose(*GuidKeyRealP);
if (*DeviceKeyRealP != NULL)
ZwClose(*DeviceKeyRealP);
if (*InstanceKeyRealP != NULL)
ZwClose(*InstanceKeyRealP);
}
return Status;
}
/*++
* @name IoOpenDeviceInterfaceRegistryKey
* @unimplemented
*
* Provides a handle to the device's interface instance registry key.
* Documented in WDK.
*
* @param SymbolicLinkName
* Pointer to a string which identifies the device interface instance
*
* @param DesiredAccess
* Desired ACCESS_MASK used to access the key (like KEY_READ,
* KEY_WRITE, etc)
*
* @param DeviceInterfaceKey
* If a call has been succesfull, a handle to the registry key
* will be stored there
*
* @return Three different NTSTATUS values in case of errors, and STATUS_SUCCESS
* otherwise (see WDK for details)
*
* @remarks Must be called at IRQL = PASSIVE_LEVEL in the context of a system thread
*
*--*/
NTSTATUS
NTAPI
IoOpenDeviceInterfaceRegistryKey(IN PUNICODE_STRING SymbolicLinkName,
IN ACCESS_MASK DesiredAccess,
OUT PHANDLE DeviceInterfaceKey)
{
HANDLE InstanceKey, DeviceParametersKey;
NTSTATUS Status;
OBJECT_ATTRIBUTES ObjectAttributes;
UNICODE_STRING DeviceParametersU = RTL_CONSTANT_STRING(L"Device Parameters");
Status = OpenRegistryHandlesFromSymbolicLink(SymbolicLinkName,
KEY_CREATE_SUB_KEY,
NULL,
NULL,
&InstanceKey);
if (!NT_SUCCESS(Status))
return Status;
InitializeObjectAttributes(&ObjectAttributes,
&DeviceParametersU,
OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE | OBJ_OPENIF,
InstanceKey,
NULL);
Status = ZwCreateKey(&DeviceParametersKey,
DesiredAccess,
&ObjectAttributes,
0,
NULL,
REG_OPTION_NON_VOLATILE,
NULL);
ZwClose(InstanceKey);
if (NT_SUCCESS(Status))
*DeviceInterfaceKey = DeviceParametersKey;
return Status;
}
/*++
* @name IoGetDeviceInterfaceAlias
* @unimplemented
*
* Returns the alias device interface of the specified device interface
* instance, if the alias exists.
* Documented in WDK.
*
* @param SymbolicLinkName
* Pointer to a string which identifies the device interface instance
*
* @param AliasInterfaceClassGuid
* See WDK
*
* @param AliasSymbolicLinkName
* See WDK
*
* @return Three different NTSTATUS values in case of errors, and STATUS_SUCCESS
* otherwise (see WDK for details)
*
* @remarks Must be called at IRQL = PASSIVE_LEVEL in the context of a system thread
*
*--*/
NTSTATUS
NTAPI
IoGetDeviceInterfaceAlias(IN PUNICODE_STRING SymbolicLinkName,
IN CONST GUID *AliasInterfaceClassGuid,
OUT PUNICODE_STRING AliasSymbolicLinkName)
{
return STATUS_NOT_IMPLEMENTED;
}
/*++
* @name IopOpenInterfaceKey
*
* Returns the alias device interface of the specified device interface
*
* @param InterfaceClassGuid
* FILLME
*
* @param DesiredAccess
* FILLME
*
* @param pInterfaceKey
* FILLME
*
* @return Usual NTSTATUS
*
* @remarks None
*
*--*/
static NTSTATUS
IopOpenInterfaceKey(IN CONST GUID *InterfaceClassGuid,
IN ACCESS_MASK DesiredAccess,
OUT HANDLE *pInterfaceKey)
{
UNICODE_STRING LocalMachine = RTL_CONSTANT_STRING(L"\\Registry\\Machine\\");
UNICODE_STRING GuidString;
UNICODE_STRING KeyName;
OBJECT_ATTRIBUTES ObjectAttributes;
HANDLE InterfaceKey = NULL;
NTSTATUS Status;
GuidString.Buffer = KeyName.Buffer = NULL;
Status = RtlStringFromGUID(InterfaceClassGuid, &GuidString);
if (!NT_SUCCESS(Status))
{
DPRINT("RtlStringFromGUID() failed with status 0x%08lx\n", Status);
goto cleanup;
}
KeyName.Length = 0;
KeyName.MaximumLength = LocalMachine.Length + ((USHORT)wcslen(REGSTR_PATH_DEVICE_CLASSES) + 1) * sizeof(WCHAR) + GuidString.Length;
KeyName.Buffer = ExAllocatePool(PagedPool, KeyName.MaximumLength);
if (!KeyName.Buffer)
{
DPRINT("ExAllocatePool() failed\n");
Status = STATUS_INSUFFICIENT_RESOURCES;
goto cleanup;
}
Status = RtlAppendUnicodeStringToString(&KeyName, &LocalMachine);
if (!NT_SUCCESS(Status))
{
DPRINT("RtlAppendUnicodeStringToString() failed with status 0x%08lx\n", Status);
goto cleanup;
}
Status = RtlAppendUnicodeToString(&KeyName, REGSTR_PATH_DEVICE_CLASSES);
if (!NT_SUCCESS(Status))
{
DPRINT("RtlAppendUnicodeToString() failed with status 0x%08lx\n", Status);
goto cleanup;
}
Status = RtlAppendUnicodeToString(&KeyName, L"\\");
if (!NT_SUCCESS(Status))
{
DPRINT("RtlAppendUnicodeToString() failed with status 0x%08lx\n", Status);
goto cleanup;
}
Status = RtlAppendUnicodeStringToString(&KeyName, &GuidString);
if (!NT_SUCCESS(Status))
{
DPRINT("RtlAppendUnicodeStringToString() failed with status 0x%08lx\n", Status);
goto cleanup;
}
InitializeObjectAttributes(
&ObjectAttributes,
&KeyName,
OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
NULL,
NULL);
Status = ZwOpenKey(
&InterfaceKey,
DesiredAccess,
&ObjectAttributes);
if (!NT_SUCCESS(Status))
{
DPRINT("ZwOpenKey() failed with status 0x%08lx\n", Status);
goto cleanup;
}
*pInterfaceKey = InterfaceKey;
Status = STATUS_SUCCESS;
cleanup:
if (!NT_SUCCESS(Status))
{
if (InterfaceKey != NULL)
ZwClose(InterfaceKey);
}
RtlFreeUnicodeString(&GuidString);
RtlFreeUnicodeString(&KeyName);
return Status;
}
/*++
* @name IoGetDeviceInterfaces
* @implemented
*
* Returns a list of device interfaces of a particular device interface class.
* Documented in WDK
*
* @param InterfaceClassGuid
* Points to a class GUID specifying the device interface class
*
* @param PhysicalDeviceObject
* Points to an optional PDO that narrows the search to only the
* device interfaces of the device represented by the PDO
*
* @param Flags
* Specifies flags that modify the search for device interfaces. The
* DEVICE_INTERFACE_INCLUDE_NONACTIVE flag specifies that the list of
* returned symbolic links should contain also disabled device
* interfaces in addition to the enabled ones.
*
* @param SymbolicLinkList
* Points to a character pointer that is filled in on successful return
* with a list of unicode strings identifying the device interfaces
* that match the search criteria. The newly allocated buffer contains
* a list of symbolic link names. Each unicode string in the list is
* null-terminated; the end of the whole list is marked by an additional
* NULL. The caller is responsible for freeing the buffer (ExFreePool)
* when it is no longer needed.
* If no device interfaces match the search criteria, this routine
* returns STATUS_SUCCESS and the string contains a single NULL
* character.
*
* @return Usual NTSTATUS
*
* @remarks None
*
*--*/
NTSTATUS
NTAPI
IoGetDeviceInterfaces(IN CONST GUID *InterfaceClassGuid,
IN PDEVICE_OBJECT PhysicalDeviceObject OPTIONAL,
IN ULONG Flags,
OUT PWSTR *SymbolicLinkList)
{
UNICODE_STRING Control = RTL_CONSTANT_STRING(L"Control");
UNICODE_STRING SymbolicLink = RTL_CONSTANT_STRING(L"SymbolicLink");
HANDLE InterfaceKey = NULL;
HANDLE DeviceKey = NULL;
HANDLE ReferenceKey = NULL;
HANDLE ControlKey = NULL;
PKEY_BASIC_INFORMATION DeviceBi = NULL;
PKEY_BASIC_INFORMATION ReferenceBi = NULL;
PKEY_VALUE_PARTIAL_INFORMATION bip = NULL;
PKEY_VALUE_PARTIAL_INFORMATION PartialInfo;
PEXTENDED_DEVOBJ_EXTENSION DeviceObjectExtension;
PUNICODE_STRING InstanceDevicePath = NULL;
UNICODE_STRING KeyName;
OBJECT_ATTRIBUTES ObjectAttributes;
BOOLEAN FoundRightPDO = FALSE;
ULONG i = 0, j, Size, NeededLength, ActualLength, LinkedValue;
UNICODE_STRING ReturnBuffer = { 0, 0, NULL };
NTSTATUS Status;
PAGED_CODE();
if (PhysicalDeviceObject != NULL)
{
/* Parameters must pass three border of checks */
DeviceObjectExtension = (PEXTENDED_DEVOBJ_EXTENSION)PhysicalDeviceObject->DeviceObjectExtension;
/* 1st level: Presence of a Device Node */
if (DeviceObjectExtension->DeviceNode == NULL)
{
DPRINT("PhysicalDeviceObject 0x%p doesn't have a DeviceNode\n", PhysicalDeviceObject);
return STATUS_INVALID_DEVICE_REQUEST;
}
/* 2nd level: Presence of an non-zero length InstancePath */
if (DeviceObjectExtension->DeviceNode->InstancePath.Length == 0)
{
DPRINT("PhysicalDeviceObject 0x%p's DOE has zero-length InstancePath\n", PhysicalDeviceObject);
return STATUS_INVALID_DEVICE_REQUEST;
}
InstanceDevicePath = &DeviceObjectExtension->DeviceNode->InstancePath;
}
Status = IopOpenInterfaceKey(InterfaceClassGuid, KEY_ENUMERATE_SUB_KEYS, &InterfaceKey);
if (!NT_SUCCESS(Status))
{
DPRINT("IopOpenInterfaceKey() failed with status 0x%08lx\n", Status);
goto cleanup;
}
/* Enumerate subkeys (i.e. the different device objects) */
while (TRUE)
{
Status = ZwEnumerateKey(
InterfaceKey,
i,
KeyBasicInformation,
NULL,
0,
&Size);
if (Status == STATUS_NO_MORE_ENTRIES)
{
break;
}
else if (!NT_SUCCESS(Status) && Status != STATUS_BUFFER_TOO_SMALL)
{
DPRINT("ZwEnumerateKey() failed with status 0x%08lx\n", Status);
goto cleanup;
}
DeviceBi = ExAllocatePool(PagedPool, Size);
if (!DeviceBi)
{
DPRINT("ExAllocatePool() failed\n");
Status = STATUS_INSUFFICIENT_RESOURCES;
goto cleanup;
}
Status = ZwEnumerateKey(
InterfaceKey,
i++,
KeyBasicInformation,
DeviceBi,
Size,
&Size);
if (!NT_SUCCESS(Status))
{
DPRINT("ZwEnumerateKey() failed with status 0x%08lx\n", Status);
goto cleanup;
}
/* Open device key */
KeyName.Length = KeyName.MaximumLength = (USHORT)DeviceBi->NameLength;
KeyName.Buffer = DeviceBi->Name;
InitializeObjectAttributes(
&ObjectAttributes,
&KeyName,
OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
InterfaceKey,
NULL);
Status = ZwOpenKey(
&DeviceKey,
KEY_ENUMERATE_SUB_KEYS,
&ObjectAttributes);
if (!NT_SUCCESS(Status))
{
DPRINT("ZwOpenKey() failed with status 0x%08lx\n", Status);
goto cleanup;
}
if (PhysicalDeviceObject)
{
/* Check if we are on the right physical device object,
* by reading the DeviceInstance string
*/
RtlInitUnicodeString(&KeyName, L"DeviceInstance");
Status = ZwQueryValueKey(DeviceKey, &KeyName, KeyValuePartialInformation, NULL, 0, &NeededLength);
if (Status == STATUS_BUFFER_TOO_SMALL)
{
ActualLength = NeededLength;
PartialInfo = ExAllocatePool(NonPagedPool, ActualLength);
if (!PartialInfo)
{
Status = STATUS_INSUFFICIENT_RESOURCES;
goto cleanup;
}
Status = ZwQueryValueKey(DeviceKey, &KeyName, KeyValuePartialInformation, PartialInfo, ActualLength, &NeededLength);
if (!NT_SUCCESS(Status))
{
DPRINT1("ZwQueryValueKey #2 failed (%x)\n", Status);
ExFreePool(PartialInfo);
goto cleanup;
}
if (PartialInfo->DataLength == InstanceDevicePath->Length)
{
if (RtlCompareMemory(PartialInfo->Data, InstanceDevicePath->Buffer, InstanceDevicePath->Length) == InstanceDevicePath->Length)
{
/* found right pdo */
FoundRightPDO = TRUE;
}
}
ExFreePool(PartialInfo);
PartialInfo = NULL;
if (!FoundRightPDO)
{
/* not yet found */
continue;
}
}
else
{
/* error */
break;
}
}
/* Enumerate subkeys (ie the different reference strings) */
j = 0;
while (TRUE)
{
Status = ZwEnumerateKey(
DeviceKey,
j,
KeyBasicInformation,
NULL,
0,
&Size);
if (Status == STATUS_NO_MORE_ENTRIES)
{
break;
}
else if (!NT_SUCCESS(Status) && Status != STATUS_BUFFER_TOO_SMALL)
{
DPRINT("ZwEnumerateKey() failed with status 0x%08lx\n", Status);
goto cleanup;
}
ReferenceBi = ExAllocatePool(PagedPool, Size);
if (!ReferenceBi)
{
DPRINT("ExAllocatePool() failed\n");
Status = STATUS_INSUFFICIENT_RESOURCES;
goto cleanup;
}
Status = ZwEnumerateKey(
DeviceKey,
j++,
KeyBasicInformation,
ReferenceBi,
Size,
&Size);
if (!NT_SUCCESS(Status))
{
DPRINT("ZwEnumerateKey() failed with status 0x%08lx\n", Status);
goto cleanup;
}
KeyName.Length = KeyName.MaximumLength = (USHORT)ReferenceBi->NameLength;
KeyName.Buffer = ReferenceBi->Name;
if (RtlEqualUnicodeString(&KeyName, &Control, TRUE))
{
/* Skip Control subkey */
goto NextReferenceString;
}
/* Open reference key */
InitializeObjectAttributes(
&ObjectAttributes,
&KeyName,
OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
DeviceKey,
NULL);
Status = ZwOpenKey(
&ReferenceKey,
KEY_QUERY_VALUE,
&ObjectAttributes);
if (!NT_SUCCESS(Status))
{
DPRINT("ZwOpenKey() failed with status 0x%08lx\n", Status);
goto cleanup;
}
if (!(Flags & DEVICE_INTERFACE_INCLUDE_NONACTIVE))
{
/* We have to check if the interface is enabled, by
* reading the Linked value in the Control subkey
*/
InitializeObjectAttributes(
&ObjectAttributes,
&Control,
OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
ReferenceKey,
NULL);
Status = ZwOpenKey(
&ControlKey,
KEY_QUERY_VALUE,
&ObjectAttributes);
if (Status == STATUS_OBJECT_NAME_NOT_FOUND)
{
/* That's OK. The key doesn't exist (yet) because
* the interface is not activated.
*/
goto NextReferenceString;
}
else if (!NT_SUCCESS(Status))
{
DPRINT1("ZwOpenKey() failed with status 0x%08lx\n", Status);
goto cleanup;
}
RtlInitUnicodeString(&KeyName, L"Linked");
Status = ZwQueryValueKey(ControlKey,
&KeyName,
KeyValuePartialInformation,
NULL,
0,
&NeededLength);
if (Status == STATUS_BUFFER_TOO_SMALL)
{
ActualLength = NeededLength;
PartialInfo = ExAllocatePool(NonPagedPool, ActualLength);
if (!PartialInfo)
{
Status = STATUS_INSUFFICIENT_RESOURCES;
goto cleanup;
}
Status = ZwQueryValueKey(ControlKey,
&KeyName,
KeyValuePartialInformation,
PartialInfo,
ActualLength,
&NeededLength);
if (!NT_SUCCESS(Status))
{
DPRINT1("ZwQueryValueKey #2 failed (%x)\n", Status);
ExFreePool(PartialInfo);
goto cleanup;
}
if (PartialInfo->Type != REG_DWORD || PartialInfo->DataLength != sizeof(ULONG))
{
DPRINT1("Bad registry read\n");
ExFreePool(PartialInfo);
goto cleanup;
}
RtlCopyMemory(&LinkedValue,
PartialInfo->Data,
PartialInfo->DataLength);
ExFreePool(PartialInfo);
if (LinkedValue == 0)
{
/* This interface isn't active */
goto NextReferenceString;
}
}
else
{
DPRINT1("ZwQueryValueKey #1 failed (%x)\n", Status);
goto cleanup;
}
}
/* Read the SymbolicLink string and add it into SymbolicLinkList */
Status = ZwQueryValueKey(
ReferenceKey,
&SymbolicLink,
KeyValuePartialInformation,
NULL,
0,
&Size);
if (!NT_SUCCESS(Status) && Status != STATUS_BUFFER_TOO_SMALL)
{
DPRINT("ZwQueryValueKey() failed with status 0x%08lx\n", Status);
goto cleanup;
}
bip = ExAllocatePool(PagedPool, Size);
if (!bip)
{
DPRINT("ExAllocatePool() failed\n");
Status = STATUS_INSUFFICIENT_RESOURCES;
goto cleanup;
}
Status = ZwQueryValueKey(
ReferenceKey,
&SymbolicLink,
KeyValuePartialInformation,
bip,
Size,
&Size);
if (!NT_SUCCESS(Status))
{
DPRINT("ZwQueryValueKey() failed with status 0x%08lx\n", Status);
goto cleanup;
}
else if (bip->Type != REG_SZ)
{
DPRINT("Unexpected registry type 0x%lx (expected 0x%lx)\n", bip->Type, REG_SZ);
Status = STATUS_UNSUCCESSFUL;
goto cleanup;
}
else if (bip->DataLength < 5 * sizeof(WCHAR))
{
DPRINT("Registry string too short (length %lu, expected %lu at least)\n", bip->DataLength, 5 * sizeof(WCHAR));
Status = STATUS_UNSUCCESSFUL;
goto cleanup;
}
KeyName.Length = KeyName.MaximumLength = (USHORT)bip->DataLength;
KeyName.Buffer = (PWSTR)bip->Data;
/* Fixup the prefix (from "\\?\") */
RtlCopyMemory(KeyName.Buffer, L"\\??\\", 4 * sizeof(WCHAR));
/* Add new symbolic link to symbolic link list */
if (ReturnBuffer.Length + KeyName.Length + sizeof(WCHAR) > ReturnBuffer.MaximumLength)
{
PWSTR NewBuffer;
ReturnBuffer.MaximumLength = (USHORT)max(2 * ReturnBuffer.MaximumLength,
(USHORT)(ReturnBuffer.Length +
KeyName.Length +
2 * sizeof(WCHAR)));
NewBuffer = ExAllocatePool(PagedPool, ReturnBuffer.MaximumLength);
if (!NewBuffer)
{
DPRINT("ExAllocatePool() failed\n");
Status = STATUS_INSUFFICIENT_RESOURCES;
goto cleanup;
}
if (ReturnBuffer.Buffer)
{
RtlCopyMemory(NewBuffer, ReturnBuffer.Buffer, ReturnBuffer.Length);
ExFreePool(ReturnBuffer.Buffer);
}
ReturnBuffer.Buffer = NewBuffer;
}
DPRINT("Adding symbolic link %wZ\n", &KeyName);
Status = RtlAppendUnicodeStringToString(&ReturnBuffer, &KeyName);
if (!NT_SUCCESS(Status))
{
DPRINT("RtlAppendUnicodeStringToString() failed with status 0x%08lx\n", Status);
goto cleanup;
}
/* RtlAppendUnicodeStringToString added a NULL at the end of the
* destination string, but didn't increase the Length field.
* Do it for it.
*/
ReturnBuffer.Length += sizeof(WCHAR);
NextReferenceString:
ExFreePool(ReferenceBi);
ReferenceBi = NULL;
if (bip)
ExFreePool(bip);
bip = NULL;
if (ReferenceKey != NULL)
{
ZwClose(ReferenceKey);
ReferenceKey = NULL;
}
if (ControlKey != NULL)
{
ZwClose(ControlKey);
ControlKey = NULL;
}
}
if (FoundRightPDO)
{
/* No need to go further, as we already have found what we searched */
break;
}
ExFreePool(DeviceBi);
DeviceBi = NULL;
ZwClose(DeviceKey);
DeviceKey = NULL;
}
/* Add final NULL to ReturnBuffer */
ASSERT(ReturnBuffer.Length <= ReturnBuffer.MaximumLength);
if (ReturnBuffer.Length >= ReturnBuffer.MaximumLength)
{
PWSTR NewBuffer;
ReturnBuffer.MaximumLength += sizeof(WCHAR);
NewBuffer = ExAllocatePool(PagedPool, ReturnBuffer.MaximumLength);
if (!NewBuffer)
{
DPRINT("ExAllocatePool() failed\n");
Status = STATUS_INSUFFICIENT_RESOURCES;
goto cleanup;
}
if (ReturnBuffer.Buffer)
{
RtlCopyMemory(NewBuffer, ReturnBuffer.Buffer, ReturnBuffer.Length);
ExFreePool(ReturnBuffer.Buffer);
}
ReturnBuffer.Buffer = NewBuffer;
}
ReturnBuffer.Buffer[ReturnBuffer.Length / sizeof(WCHAR)] = UNICODE_NULL;
*SymbolicLinkList = ReturnBuffer.Buffer;
Status = STATUS_SUCCESS;
cleanup:
if (!NT_SUCCESS(Status) && ReturnBuffer.Buffer)
ExFreePool(ReturnBuffer.Buffer);
if (InterfaceKey != NULL)
ZwClose(InterfaceKey);
if (DeviceKey != NULL)
ZwClose(DeviceKey);
if (ReferenceKey != NULL)
ZwClose(ReferenceKey);
if (ControlKey != NULL)
ZwClose(ControlKey);
if (DeviceBi)
ExFreePool(DeviceBi);
if (ReferenceBi)
ExFreePool(ReferenceBi);
if (bip)
ExFreePool(bip);
return Status;
}
/*++
* @name IoRegisterDeviceInterface
* @implemented
*
* Registers a device interface class, if it has not been previously registered,
* and creates a new instance of the interface class, which a driver can
* subsequently enable for use by applications or other system components.
* Documented in WDK.
*
* @param PhysicalDeviceObject
* Points to an optional PDO that narrows the search to only the
* device interfaces of the device represented by the PDO
*
* @param InterfaceClassGuid
* Points to a class GUID specifying the device interface class
*
* @param ReferenceString
* Optional parameter, pointing to a unicode string. For a full
* description of this rather rarely used param (usually drivers
* pass NULL here) see WDK
*
* @param SymbolicLinkName
* Pointer to the resulting unicode string
*
* @return Usual NTSTATUS
*
* @remarks Must be called at IRQL = PASSIVE_LEVEL in the context of a
* system thread
*
*--*/
NTSTATUS
NTAPI
IoRegisterDeviceInterface(IN PDEVICE_OBJECT PhysicalDeviceObject,
IN CONST GUID *InterfaceClassGuid,
IN PUNICODE_STRING ReferenceString OPTIONAL,
OUT PUNICODE_STRING SymbolicLinkName)
{
PUNICODE_STRING InstancePath;
UNICODE_STRING GuidString;
UNICODE_STRING SubKeyName;
UNICODE_STRING InterfaceKeyName;
UNICODE_STRING BaseKeyName;
UCHAR PdoNameInfoBuffer[sizeof(OBJECT_NAME_INFORMATION) + (256 * sizeof(WCHAR))];
POBJECT_NAME_INFORMATION PdoNameInfo = (POBJECT_NAME_INFORMATION)PdoNameInfoBuffer;
UNICODE_STRING DeviceInstance = RTL_CONSTANT_STRING(L"DeviceInstance");
UNICODE_STRING SymbolicLink = RTL_CONSTANT_STRING(L"SymbolicLink");
HANDLE ClassKey;
HANDLE InterfaceKey;
HANDLE SubKey;
ULONG StartIndex;
OBJECT_ATTRIBUTES ObjectAttributes;
ULONG i;
NTSTATUS Status, SymLinkStatus;
PEXTENDED_DEVOBJ_EXTENSION DeviceObjectExtension;
ASSERT_IRQL_EQUAL(PASSIVE_LEVEL);
DPRINT("IoRegisterDeviceInterface(): PDO %p, RefString: %wZ\n",
PhysicalDeviceObject, ReferenceString);
/* Parameters must pass three border of checks */
DeviceObjectExtension = (PEXTENDED_DEVOBJ_EXTENSION)PhysicalDeviceObject->DeviceObjectExtension;
/* 1st level: Presence of a Device Node */
if (DeviceObjectExtension->DeviceNode == NULL)
{
DPRINT("PhysicalDeviceObject 0x%p doesn't have a DeviceNode\n", PhysicalDeviceObject);
return STATUS_INVALID_DEVICE_REQUEST;
}
/* 2nd level: Presence of an non-zero length InstancePath */
if (DeviceObjectExtension->DeviceNode->InstancePath.Length == 0)
{
DPRINT("PhysicalDeviceObject 0x%p's DOE has zero-length InstancePath\n", PhysicalDeviceObject);
return STATUS_INVALID_DEVICE_REQUEST;
}
/* 3rd level: Optional, based on WDK documentation */
if (ReferenceString != NULL)
{
/* Reference string must not contain path-separator symbols */
for (i = 0; i < ReferenceString->Length / sizeof(WCHAR); i++)
{
if ((ReferenceString->Buffer[i] == '\\') ||
(ReferenceString->Buffer[i] == '/'))
return STATUS_INVALID_DEVICE_REQUEST;
}
}
Status = RtlStringFromGUID(InterfaceClassGuid, &GuidString);
if (!NT_SUCCESS(Status))
{
DPRINT("RtlStringFromGUID() failed with status 0x%08lx\n", Status);
return Status;
}
/* Create Pdo name: \Device\xxxxxxxx (unnamed device) */
Status = ObQueryNameString(
PhysicalDeviceObject,
PdoNameInfo,
sizeof(PdoNameInfoBuffer),
&i);
if (!NT_SUCCESS(Status))
{
DPRINT("ObQueryNameString() failed with status 0x%08lx\n", Status);
return Status;
}
ASSERT(PdoNameInfo->Name.Length);
/* Create base key name for this interface: HKLM\SYSTEM\CurrentControlSet\Control\DeviceClasses\{GUID} */
ASSERT(((PEXTENDED_DEVOBJ_EXTENSION)PhysicalDeviceObject->DeviceObjectExtension)->DeviceNode);
InstancePath = &((PEXTENDED_DEVOBJ_EXTENSION)PhysicalDeviceObject->DeviceObjectExtension)->DeviceNode->InstancePath;
BaseKeyName.Length = (USHORT)wcslen(BaseKeyString) * sizeof(WCHAR);
BaseKeyName.MaximumLength = BaseKeyName.Length
+ GuidString.Length;
BaseKeyName.Buffer = ExAllocatePool(
PagedPool,
BaseKeyName.MaximumLength);
if (!BaseKeyName.Buffer)
{
DPRINT("ExAllocatePool() failed\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
wcscpy(BaseKeyName.Buffer, BaseKeyString);
RtlAppendUnicodeStringToString(&BaseKeyName, &GuidString);
/* Create BaseKeyName key in registry */
InitializeObjectAttributes(
&ObjectAttributes,
&BaseKeyName,
OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE | OBJ_OPENIF,
NULL, /* RootDirectory */
NULL); /* SecurityDescriptor */
Status = ZwCreateKey(
&ClassKey,
KEY_WRITE,
&ObjectAttributes,
0, /* TileIndex */
NULL, /* Class */
REG_OPTION_VOLATILE,
NULL); /* Disposition */
if (!NT_SUCCESS(Status))
{
DPRINT("ZwCreateKey() failed with status 0x%08lx\n", Status);
ExFreePool(BaseKeyName.Buffer);
return Status;
}
/* Create key name for this interface: ##?#ACPI#PNP0501#1#{GUID} */
InterfaceKeyName.Length = 0;
InterfaceKeyName.MaximumLength =
4 * sizeof(WCHAR) + /* 4 = size of ##?# */
InstancePath->Length +
sizeof(WCHAR) + /* 1 = size of # */
GuidString.Length;
InterfaceKeyName.Buffer = ExAllocatePool(
PagedPool,
InterfaceKeyName.MaximumLength);
if (!InterfaceKeyName.Buffer)
{
DPRINT("ExAllocatePool() failed\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
RtlAppendUnicodeToString(&InterfaceKeyName, L"##?#");
StartIndex = InterfaceKeyName.Length / sizeof(WCHAR);
RtlAppendUnicodeStringToString(&InterfaceKeyName, InstancePath);
for (i = 0; i < InstancePath->Length / sizeof(WCHAR); i++)
{
if (InterfaceKeyName.Buffer[StartIndex + i] == '\\')
InterfaceKeyName.Buffer[StartIndex + i] = '#';
}
RtlAppendUnicodeToString(&InterfaceKeyName, L"#");
RtlAppendUnicodeStringToString(&InterfaceKeyName, &GuidString);
/* Create the interface key in registry */
InitializeObjectAttributes(
&ObjectAttributes,
&InterfaceKeyName,
OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE | OBJ_OPENIF,
ClassKey,
NULL); /* SecurityDescriptor */
Status = ZwCreateKey(
&InterfaceKey,
KEY_WRITE,
&ObjectAttributes,
0, /* TileIndex */
NULL, /* Class */
REG_OPTION_VOLATILE,
NULL); /* Disposition */
if (!NT_SUCCESS(Status))
{
DPRINT("ZwCreateKey() failed with status 0x%08lx\n", Status);
ZwClose(ClassKey);
ExFreePool(BaseKeyName.Buffer);
return Status;
}
/* Write DeviceInstance entry. Value is InstancePath */
Status = ZwSetValueKey(
InterfaceKey,
&DeviceInstance,
0, /* TileIndex */
REG_SZ,
InstancePath->Buffer,
InstancePath->Length);
if (!NT_SUCCESS(Status))
{
DPRINT("ZwSetValueKey() failed with status 0x%08lx\n", Status);
ZwClose(InterfaceKey);
ZwClose(ClassKey);
ExFreePool(InterfaceKeyName.Buffer);
ExFreePool(BaseKeyName.Buffer);
return Status;
}
/* Create subkey. Name is #ReferenceString */
SubKeyName.Length = 0;
SubKeyName.MaximumLength = sizeof(WCHAR);
if (ReferenceString && ReferenceString->Length)
SubKeyName.MaximumLength += ReferenceString->Length;
SubKeyName.Buffer = ExAllocatePool(
PagedPool,
SubKeyName.MaximumLength);
if (!SubKeyName.Buffer)
{
DPRINT("ExAllocatePool() failed\n");
ZwClose(InterfaceKey);
ZwClose(ClassKey);
ExFreePool(InterfaceKeyName.Buffer);
ExFreePool(BaseKeyName.Buffer);
return STATUS_INSUFFICIENT_RESOURCES;
}
RtlAppendUnicodeToString(&SubKeyName, L"#");
if (ReferenceString && ReferenceString->Length)
RtlAppendUnicodeStringToString(&SubKeyName, ReferenceString);
/* Create SubKeyName key in registry */
InitializeObjectAttributes(
&ObjectAttributes,
&SubKeyName,
OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
InterfaceKey, /* RootDirectory */
NULL); /* SecurityDescriptor */
Status = ZwCreateKey(
&SubKey,
KEY_WRITE,
&ObjectAttributes,
0, /* TileIndex */
NULL, /* Class */
REG_OPTION_VOLATILE,
NULL); /* Disposition */
if (!NT_SUCCESS(Status))
{
DPRINT("ZwCreateKey() failed with status 0x%08lx\n", Status);
ZwClose(InterfaceKey);
ZwClose(ClassKey);
ExFreePool(InterfaceKeyName.Buffer);
ExFreePool(BaseKeyName.Buffer);
return Status;
}
/* Create symbolic link name: \??\ACPI#PNP0501#1#{GUID}\ReferenceString */
SymbolicLinkName->Length = 0;
SymbolicLinkName->MaximumLength = SymbolicLinkName->Length
+ 4 * sizeof(WCHAR) /* 4 = size of \??\ */
+ InstancePath->Length
+ sizeof(WCHAR) /* 1 = size of # */
+ GuidString.Length
+ sizeof(WCHAR); /* final NULL */
if (ReferenceString && ReferenceString->Length)
SymbolicLinkName->MaximumLength += sizeof(WCHAR) + ReferenceString->Length;
SymbolicLinkName->Buffer = ExAllocatePool(
PagedPool,
SymbolicLinkName->MaximumLength);
if (!SymbolicLinkName->Buffer)
{
DPRINT("ExAllocatePool() failed\n");
ZwClose(SubKey);
ZwClose(InterfaceKey);
ZwClose(ClassKey);
ExFreePool(InterfaceKeyName.Buffer);
ExFreePool(SubKeyName.Buffer);
ExFreePool(BaseKeyName.Buffer);
return STATUS_INSUFFICIENT_RESOURCES;
}
RtlAppendUnicodeToString(SymbolicLinkName, L"\\??\\");
StartIndex = SymbolicLinkName->Length / sizeof(WCHAR);
RtlAppendUnicodeStringToString(SymbolicLinkName, InstancePath);
for (i = 0; i < InstancePath->Length / sizeof(WCHAR); i++)
{
if (SymbolicLinkName->Buffer[StartIndex + i] == '\\')
SymbolicLinkName->Buffer[StartIndex + i] = '#';
}
RtlAppendUnicodeToString(SymbolicLinkName, L"#");
RtlAppendUnicodeStringToString(SymbolicLinkName, &GuidString);
SymbolicLinkName->Buffer[SymbolicLinkName->Length/sizeof(WCHAR)] = L'\0';
/* Create symbolic link */
DPRINT("IoRegisterDeviceInterface(): creating symbolic link %wZ -> %wZ\n", SymbolicLinkName, &PdoNameInfo->Name);
SymLinkStatus = IoCreateSymbolicLink(SymbolicLinkName, &PdoNameInfo->Name);
/* If the symbolic link already exists, return an informational success status */
if (SymLinkStatus == STATUS_OBJECT_NAME_COLLISION)
{
/* HACK: Delete the existing symbolic link and update it to the new PDO name */
IoDeleteSymbolicLink(SymbolicLinkName);
IoCreateSymbolicLink(SymbolicLinkName, &PdoNameInfo->Name);
SymLinkStatus = STATUS_OBJECT_NAME_EXISTS;
}
if (!NT_SUCCESS(SymLinkStatus))
{
DPRINT1("IoCreateSymbolicLink() failed with status 0x%08lx\n", SymLinkStatus);
ZwClose(SubKey);
ZwClose(InterfaceKey);
ZwClose(ClassKey);
ExFreePool(SubKeyName.Buffer);
ExFreePool(InterfaceKeyName.Buffer);
ExFreePool(BaseKeyName.Buffer);
ExFreePool(SymbolicLinkName->Buffer);
return SymLinkStatus;
}
if (ReferenceString && ReferenceString->Length)
{
RtlAppendUnicodeToString(SymbolicLinkName, L"\\");
RtlAppendUnicodeStringToString(SymbolicLinkName, ReferenceString);
}
SymbolicLinkName->Buffer[SymbolicLinkName->Length/sizeof(WCHAR)] = L'\0';
/* Write symbolic link name in registry */
SymbolicLinkName->Buffer[1] = '\\';
Status = ZwSetValueKey(
SubKey,
&SymbolicLink,
0, /* TileIndex */
REG_SZ,
SymbolicLinkName->Buffer,
SymbolicLinkName->Length);
if (!NT_SUCCESS(Status))
{
DPRINT1("ZwSetValueKey() failed with status 0x%08lx\n", Status);
ExFreePool(SymbolicLinkName->Buffer);
}
else
{
SymbolicLinkName->Buffer[1] = '?';
}
ZwClose(SubKey);
ZwClose(InterfaceKey);
ZwClose(ClassKey);
ExFreePool(SubKeyName.Buffer);
ExFreePool(InterfaceKeyName.Buffer);
ExFreePool(BaseKeyName.Buffer);
return NT_SUCCESS(Status) ? SymLinkStatus : Status;
}
/*++
* @name IoSetDeviceInterfaceState
* @implemented
*
* Enables or disables an instance of a previously registered device
* interface class.
* Documented in WDK.
*
* @param SymbolicLinkName
* Pointer to the string identifying instance to enable or disable
*
* @param Enable
* TRUE = enable, FALSE = disable
*
* @return Usual NTSTATUS
*
* @remarks Must be called at IRQL = PASSIVE_LEVEL in the context of a
* system thread
*
*--*/
NTSTATUS
NTAPI
IoSetDeviceInterfaceState(IN PUNICODE_STRING SymbolicLinkName,
IN BOOLEAN Enable)
{
PDEVICE_OBJECT PhysicalDeviceObject;
UNICODE_STRING GuidString;
NTSTATUS Status;
LPCGUID EventGuid;
HANDLE InstanceHandle, ControlHandle;
UNICODE_STRING KeyName, DeviceInstance;
OBJECT_ATTRIBUTES ObjectAttributes;
ULONG LinkedValue, Index;
GUID DeviceGuid;
UNICODE_STRING DosDevicesPrefix1 = RTL_CONSTANT_STRING(L"\\??\\");
UNICODE_STRING DosDevicesPrefix2 = RTL_CONSTANT_STRING(L"\\\\?\\");
UNICODE_STRING LinkNameNoPrefix;
USHORT i;
USHORT ReferenceStringOffset;
if (SymbolicLinkName == NULL)
{
return STATUS_INVALID_PARAMETER;
}
DPRINT("IoSetDeviceInterfaceState('%wZ', %u)\n", SymbolicLinkName, Enable);
/* Symbolic link name is \??\ACPI#PNP0501#1#{GUID}\ReferenceString */
/* Make sure it starts with the expected prefix */
if (!RtlPrefixUnicodeString(&DosDevicesPrefix1, SymbolicLinkName, FALSE) &&
!RtlPrefixUnicodeString(&DosDevicesPrefix2, SymbolicLinkName, FALSE))
{
DPRINT1("IoSetDeviceInterfaceState() invalid link name '%wZ'\n", SymbolicLinkName);
return STATUS_INVALID_PARAMETER;
}
/* Make a version without the prefix for further processing */
ASSERT(DosDevicesPrefix1.Length == DosDevicesPrefix2.Length);
ASSERT(SymbolicLinkName->Length >= DosDevicesPrefix1.Length);
LinkNameNoPrefix.Buffer = SymbolicLinkName->Buffer + DosDevicesPrefix1.Length / sizeof(WCHAR);
LinkNameNoPrefix.Length = SymbolicLinkName->Length - DosDevicesPrefix1.Length;
LinkNameNoPrefix.MaximumLength = LinkNameNoPrefix.Length;
/* Find the reference string, if any */
for (i = 0; i < LinkNameNoPrefix.Length / sizeof(WCHAR); i++)
{
if (LinkNameNoPrefix.Buffer[i] == L'\\')
{
break;
}
}
ReferenceStringOffset = i * sizeof(WCHAR);
/* The GUID is before the reference string or at the end */
ASSERT(LinkNameNoPrefix.Length >= ReferenceStringOffset);
if (ReferenceStringOffset < GUID_STRING_BYTES + sizeof(WCHAR))
{
DPRINT1("IoSetDeviceInterfaceState() invalid link name '%wZ'\n", SymbolicLinkName);
return STATUS_INVALID_PARAMETER;
}
GuidString.Buffer = LinkNameNoPrefix.Buffer + (ReferenceStringOffset - GUID_STRING_BYTES) / sizeof(WCHAR);
GuidString.Length = GUID_STRING_BYTES;
GuidString.MaximumLength = GuidString.Length;
Status = RtlGUIDFromString(&GuidString, &DeviceGuid);
if (!NT_SUCCESS(Status))
{
DPRINT1("RtlGUIDFromString() invalid GUID '%wZ' in link name '%wZ'\n", &GuidString, SymbolicLinkName);
return Status;
}
/* Open registry keys */
Status = OpenRegistryHandlesFromSymbolicLink(SymbolicLinkName,
KEY_CREATE_SUB_KEY,
NULL,
NULL,
&InstanceHandle);
if (!NT_SUCCESS(Status))
return Status;
RtlInitUnicodeString(&KeyName, L"Control");
InitializeObjectAttributes(&ObjectAttributes,
&KeyName,
OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
InstanceHandle,
NULL);
Status = ZwCreateKey(&ControlHandle,
KEY_SET_VALUE,
&ObjectAttributes,
0,
NULL,
REG_OPTION_VOLATILE,
NULL);
ZwClose(InstanceHandle);
if (!NT_SUCCESS(Status))
{
DPRINT1("Failed to create the Control subkey\n");
return Status;
}
LinkedValue = (Enable ? 1 : 0);
RtlInitUnicodeString(&KeyName, L"Linked");
Status = ZwSetValueKey(ControlHandle,
&KeyName,
0,
REG_DWORD,
&LinkedValue,
sizeof(ULONG));
ZwClose(ControlHandle);
if (!NT_SUCCESS(Status))
{
DPRINT1("Failed to write the Linked value\n");
return Status;
}
ASSERT(GuidString.Buffer >= LinkNameNoPrefix.Buffer + 1);
DeviceInstance.Length = (GuidString.Buffer - LinkNameNoPrefix.Buffer - 1) * sizeof(WCHAR);
if (DeviceInstance.Length == 0)
{
DPRINT1("No device instance in link name '%wZ'\n", SymbolicLinkName);
return STATUS_OBJECT_NAME_NOT_FOUND;
}
DeviceInstance.MaximumLength = DeviceInstance.Length;
DeviceInstance.Buffer = ExAllocatePoolWithTag(PagedPool,
DeviceInstance.MaximumLength,
TAG_IO);
if (DeviceInstance.Buffer == NULL)
{
/* no memory */
return STATUS_INSUFFICIENT_RESOURCES;
}
RtlCopyMemory(DeviceInstance.Buffer,
LinkNameNoPrefix.Buffer,
DeviceInstance.Length);
for (Index = 0; Index < DeviceInstance.Length / sizeof(WCHAR); Index++)
{
if (DeviceInstance.Buffer[Index] == L'#')
{
DeviceInstance.Buffer[Index] = L'\\';
}
}
PhysicalDeviceObject = IopGetDeviceObjectFromDeviceInstance(&DeviceInstance);
if (!PhysicalDeviceObject)
{
DPRINT1("IopGetDeviceObjectFromDeviceInstance failed to find device object for %wZ\n", &DeviceInstance);
ExFreePoolWithTag(DeviceInstance.Buffer, TAG_IO);
return STATUS_OBJECT_NAME_NOT_FOUND;
}
ExFreePoolWithTag(DeviceInstance.Buffer, TAG_IO);
EventGuid = Enable ? &GUID_DEVICE_INTERFACE_ARRIVAL : &GUID_DEVICE_INTERFACE_REMOVAL;
IopNotifyPlugPlayNotification(
PhysicalDeviceObject,
EventCategoryDeviceInterfaceChange,
EventGuid,
&DeviceGuid,
(PVOID)SymbolicLinkName);
ObDereferenceObject(PhysicalDeviceObject);
DPRINT("Status %x\n", Status);
return STATUS_SUCCESS;
}
/* EOF */
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