mirror of
https://github.com/reactos/reactos.git
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[NTOSKRNL]
- Create a helper function named OpenRegistryHandlesFromSymbolicLink which opens handles to various paths associated with a symbolic link - Store the Linked value in IoSetDeviceInterfaceState - Implement checking if an interface is enabled by reading the Linked value - Interfaces reported from IoGetDeviceInterfaces are only active ones now (unless the caller explicitly says that they want disabled ones too) svn path=/trunk/; revision=47029
This commit is contained in:
Cameron Gutman
parent
770cc844b0
commit
540e5b6f31
1 changed files with 280 additions and 12 deletions
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@ -20,6 +20,180 @@
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static PWCHAR BaseKeyString = L"\\Registry\\Machine\\System\\CurrentControlSet\\Control\\DeviceClasses\\";
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static
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NTSTATUS
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OpenRegistryHandlesFromSymbolicLink(IN PUNICODE_STRING SymbolicLinkName,
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IN ACCESS_MASK DesiredAccess,
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IN OPTIONAL PHANDLE GuidKey,
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IN OPTIONAL PHANDLE DeviceKey,
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IN OPTIONAL PHANDLE InstanceKey)
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{
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OBJECT_ATTRIBUTES ObjectAttributes;
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WCHAR PathBuffer[MAX_PATH];
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UNICODE_STRING BaseKeyU;
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UNICODE_STRING GuidString, SubKeyName, ReferenceString;
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PWCHAR StartPosition, EndPosition;
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HANDLE ClassesKey;
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PHANDLE GuidKeyRealP, DeviceKeyRealP, InstanceKeyRealP;
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HANDLE GuidKeyReal, DeviceKeyReal, InstanceKeyReal;
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NTSTATUS Status;
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SubKeyName.Buffer = NULL;
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if (GuidKey != NULL)
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GuidKeyRealP = GuidKey;
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else
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GuidKeyRealP = &GuidKeyReal;
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if (DeviceKey != NULL)
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DeviceKeyRealP = DeviceKey;
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else
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DeviceKeyRealP = &DeviceKeyReal;
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if (InstanceKey != NULL)
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InstanceKeyRealP = InstanceKey;
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else
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InstanceKeyRealP = &InstanceKeyReal;
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*GuidKeyRealP = INVALID_HANDLE_VALUE;
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*DeviceKeyRealP = INVALID_HANDLE_VALUE;
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*InstanceKeyRealP = INVALID_HANDLE_VALUE;
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BaseKeyU.Buffer = PathBuffer;
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BaseKeyU.Length = 0;
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BaseKeyU.MaximumLength = MAX_PATH * sizeof(WCHAR);
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RtlAppendUnicodeToString(&BaseKeyU, BaseKeyString);
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/* Open the DeviceClasses key */
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InitializeObjectAttributes(&ObjectAttributes,
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&BaseKeyU,
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OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
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NULL,
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NULL);
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Status = ZwOpenKey(&ClassesKey,
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DesiredAccess | KEY_ENUMERATE_SUB_KEYS,
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&ObjectAttributes);
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if (!NT_SUCCESS(Status))
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{
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DPRINT1("Failed to open %wZ\n", &BaseKeyU);
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goto cleanup;
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}
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StartPosition = wcschr(SymbolicLinkName->Buffer, L'{');
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EndPosition = wcschr(SymbolicLinkName->Buffer, L'}');
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if (!StartPosition || !EndPosition || StartPosition > EndPosition)
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{
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DPRINT1("Bad symbolic link: %wZ\n", SymbolicLinkName);
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return STATUS_INVALID_PARAMETER_1;
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}
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GuidString.Buffer = StartPosition;
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GuidString.MaximumLength = GuidString.Length = (USHORT)((ULONG_PTR)(EndPosition + 1) - (ULONG_PTR)StartPosition);
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InitializeObjectAttributes(&ObjectAttributes,
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&GuidString,
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OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
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ClassesKey,
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NULL);
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Status = ZwOpenKey(GuidKeyRealP,
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DesiredAccess | KEY_ENUMERATE_SUB_KEYS,
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&ObjectAttributes);
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ZwClose(ClassesKey);
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if (!NT_SUCCESS(Status))
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{
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DPRINT1("Failed to open %wZ%wZ (%x)\n", &BaseKeyU, &GuidString, Status);
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goto cleanup;
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}
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SubKeyName.Buffer = ExAllocatePool(PagedPool, SymbolicLinkName->Length);
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if (!SubKeyName.Buffer)
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{
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Status = STATUS_INSUFFICIENT_RESOURCES;
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goto cleanup;
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}
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SubKeyName.MaximumLength = SymbolicLinkName->Length;
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SubKeyName.Length = 0;
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RtlAppendUnicodeStringToString(&SubKeyName,
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SymbolicLinkName);
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SubKeyName.Buffer[0] = L'#';
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SubKeyName.Buffer[1] = L'#';
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SubKeyName.Buffer[2] = L'?';
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SubKeyName.Buffer[3] = L'#';
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ReferenceString.Buffer = wcsrchr(SubKeyName.Buffer, '\\');
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if (ReferenceString.Buffer != NULL)
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{
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ReferenceString.Buffer[0] = L'#';
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SubKeyName.Length = ReferenceString.Buffer - SubKeyName.Buffer;
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ReferenceString.Length = SymbolicLinkName->Length - SubKeyName.Length;
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}
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else
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{
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RtlInitUnicodeString(&ReferenceString, L"#");
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}
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InitializeObjectAttributes(&ObjectAttributes,
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&SubKeyName,
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OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
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*GuidKeyRealP,
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NULL);
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Status = ZwOpenKey(DeviceKeyRealP,
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DesiredAccess | KEY_ENUMERATE_SUB_KEYS,
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&ObjectAttributes);
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if (!NT_SUCCESS(Status))
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{
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DPRINT1("Failed to open %wZ%wZ\\%wZ\n", &BaseKeyU, &GuidString, &SubKeyName);
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goto cleanup;
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}
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InitializeObjectAttributes(&ObjectAttributes,
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&ReferenceString,
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OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
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*DeviceKeyRealP,
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NULL);
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Status = ZwOpenKey(InstanceKeyRealP,
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DesiredAccess,
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&ObjectAttributes);
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if (!NT_SUCCESS(Status))
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{
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DPRINT1("Failed to open %wZ%wZ\\%wZ%\\%wZ (%x)\n", &BaseKeyU, &GuidString, &SubKeyName, &ReferenceString, Status);
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goto cleanup;
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}
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Status = STATUS_SUCCESS;
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cleanup:
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if (SubKeyName.Buffer != NULL)
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ExFreePool(SubKeyName.Buffer);
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if (NT_SUCCESS(Status))
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{
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if (!GuidKey)
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ZwClose(*GuidKeyRealP);
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if (!DeviceKey)
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ZwClose(*DeviceKeyRealP);
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if (!InstanceKey)
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ZwClose(*InstanceKeyRealP);
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}
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else
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{
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if (*GuidKeyRealP != INVALID_HANDLE_VALUE)
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ZwClose(*GuidKeyRealP);
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if (*DeviceKeyRealP != INVALID_HANDLE_VALUE)
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ZwClose(*DeviceKeyRealP);
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if (*InstanceKeyRealP != INVALID_HANDLE_VALUE)
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ZwClose(*InstanceKeyRealP);
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}
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return Status;
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}
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/*++
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* @name IoOpenDeviceInterfaceRegistryKey
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* @unimplemented
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@ -395,10 +569,11 @@ IoGetDeviceInterfaces(IN CONST GUID *InterfaceClassGuid,
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PKEY_BASIC_INFORMATION DeviceBi = NULL;
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PKEY_BASIC_INFORMATION ReferenceBi = NULL;
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PKEY_VALUE_PARTIAL_INFORMATION bip = NULL;
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PKEY_VALUE_PARTIAL_INFORMATION PartialInfo;
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UNICODE_STRING KeyName;
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OBJECT_ATTRIBUTES ObjectAttributes;
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BOOLEAN FoundRightPDO = FALSE;
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ULONG i = 0, j, Size;
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ULONG i = 0, j, Size, NeededLength, ActualLength, LinkedValue;
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UNICODE_STRING ReturnBuffer = { 0, 0, NULL };
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NTSTATUS Status;
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@ -552,7 +727,6 @@ IoGetDeviceInterfaces(IN CONST GUID *InterfaceClassGuid,
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/* We have to check if the interface is enabled, by
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* reading the Linked value in the Control subkey
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*/
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#if 0
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InitializeObjectAttributes(
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&ObjectAttributes,
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&Control,
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@ -572,17 +746,63 @@ IoGetDeviceInterfaces(IN CONST GUID *InterfaceClassGuid,
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}
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else if (!NT_SUCCESS(Status))
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{
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DPRINT("ZwOpenKey() failed with status 0x%08lx\n", Status);
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DPRINT1("ZwOpenKey() failed with status 0x%08lx\n", Status);
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goto cleanup;
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}
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RtlInitUnicodeString(&KeyName, L"Linked");
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Status = ZwQueryValueKey(ControlKey,
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&KeyName,
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KeyValuePartialInformation,
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NULL,
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0,
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&NeededLength);
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if (Status == STATUS_BUFFER_TOO_SMALL)
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{
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ActualLength = NeededLength;
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PartialInfo = ExAllocatePool(NonPagedPool, ActualLength);
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if (!PartialInfo)
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{
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Status = STATUS_INSUFFICIENT_RESOURCES;
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goto cleanup;
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}
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Status = ZwQueryValueKey(ControlKey,
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&KeyName,
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KeyValuePartialInformation,
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PartialInfo,
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ActualLength,
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&NeededLength);
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if (!NT_SUCCESS(Status))
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{
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DPRINT1("ZwQueryValueKey #2 failed (%x)\n", Status);
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ExFreePool(PartialInfo);
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goto cleanup;
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}
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if (PartialInfo->Type != REG_DWORD || PartialInfo->DataLength != sizeof(ULONG))
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{
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DPRINT1("Bad registry read\n");
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ExFreePool(PartialInfo);
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goto cleanup;
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}
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RtlCopyMemory(&LinkedValue,
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PartialInfo->Data,
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PartialInfo->DataLength);
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ExFreePool(PartialInfo);
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if (LinkedValue == 0)
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{
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/* This interface isn't active */
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goto NextReferenceString;
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}
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}
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else
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{
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DPRINT1("ZwQueryValueKey #1 failed (%x)\n", Status);
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goto cleanup;
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}
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#endif
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/* FIXME: Read the Linked value
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* If it doesn't exist => ERROR
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* If it is not a REG_DWORD or Size != sizeof(ULONG) => ERROR
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* If its value is 0, go to NextReferenceString
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* At the moment, do as if it is active...
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*/
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DPRINT1("Checking if device is enabled is not implemented yet!\n");
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}
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/* Read the SymbolicLink string and add it into SymbolicLinkList */
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@ -1118,7 +1338,10 @@ IoSetDeviceInterfaceState(IN PUNICODE_STRING SymbolicLinkName,
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PWCHAR EndPosition;
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NTSTATUS Status;
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LPCGUID EventGuid;
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HANDLE InstanceHandle, ControlHandle;
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UNICODE_STRING KeyName;
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OBJECT_ATTRIBUTES ObjectAttributes;
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ULONG LinkedValue;
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if (SymbolicLinkName == NULL)
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return STATUS_INVALID_PARAMETER_1;
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@ -1140,6 +1363,51 @@ IoSetDeviceInterfaceState(IN PUNICODE_STRING SymbolicLinkName,
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SymLink.Buffer = SymbolicLinkName->Buffer;
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SymLink.MaximumLength = SymLink.Length = (USHORT)((ULONG_PTR)(EndPosition + 1) - (ULONG_PTR)SymLink.Buffer);
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DPRINT("IoSetDeviceInterfaceState('%wZ', %d)\n", SymbolicLinkName, Enable);
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Status = OpenRegistryHandlesFromSymbolicLink(SymbolicLinkName,
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KEY_CREATE_SUB_KEY,
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NULL,
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NULL,
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&InstanceHandle);
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if (!NT_SUCCESS(Status))
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return Status;
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RtlInitUnicodeString(&KeyName, L"Control");
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InitializeObjectAttributes(&ObjectAttributes,
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&KeyName,
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OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
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InstanceHandle,
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NULL);
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Status = ZwCreateKey(&ControlHandle,
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KEY_SET_VALUE,
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&ObjectAttributes,
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0,
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NULL,
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REG_OPTION_VOLATILE,
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NULL);
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ZwClose(InstanceHandle);
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if (!NT_SUCCESS(Status))
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{
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DPRINT1("Failed to create the Control subkey\n");
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return Status;
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}
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LinkedValue = (Enable ? 1 : 0);
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RtlInitUnicodeString(&KeyName, L"Linked");
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Status = ZwSetValueKey(ControlHandle,
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&KeyName,
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0,
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REG_DWORD,
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&LinkedValue,
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sizeof(ULONG));
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ZwClose(ControlHandle);
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if (!NT_SUCCESS(Status))
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{
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DPRINT1("Failed to write the Linked value\n");
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return Status;
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}
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/* Get pointer to the PDO */
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Status = IoGetDeviceObjectPointer(
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&SymLink,
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