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reactos/ntoskrnl/io/iomgr/deviface.c
Oleg Dubinskiy 7309801e5a [NTOS:IO] IoRegisterDeviceInterface: create non-volatile keys for new device interfaces 
Always create only non-volatile (sub)keys when registering a new device interface, so then they are saved after reboot.
On Windows, nearly all device interface keys are non-volatile, except the "Control" subkey, which is managed by IoSetDeviceInterfaceState instead.
In particular, it fixes MS sysaudio loading failure with MS audio drivers replacement (ks, portcls, swenum, sysaudio, wdmaud). My IoGetDeviceInterfaceAlias implementation is also required to be applied. MS sysaudio implementation(s) except that those keys are non-volatile (but we're creating them volatile instead), and trying to create a subkey(s) there (via other IoDeviceInterface* routines), to read/write some needed data. But then they fail to do that with STATUS_CHILD_MUST_BE_VOLATILE (0xc0000181), obviously because our keys are volatile.
The volatile keys can never have non-volatile subkeys.
CORE-17361
2022-03-28 08:13:05 +02:00

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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;
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;
RtlInitUnicodeString(&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_NON_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_NON_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_NON_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_NON_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_NON_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_NON_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;
PiNotifyDeviceInterfaceChange(EventGuid, &DeviceGuid, SymbolicLinkName);
ObDereferenceObject(PhysicalDeviceObject);
DPRINT("Status %x\n", Status);
return STATUS_SUCCESS;
}
/* EOF */
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