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/*
* Copyright (C) 2005 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
//
#ifndef ANDROID_IINTERFACE_H
#define ANDROID_IINTERFACE_H
#include <binder/Binder.h>
#include <assert.h>
namespace android {
// ----------------------------------------------------------------------
class IInterface : public virtual RefBase
{
public:
IInterface();
static sp<IBinder> asBinder(const IInterface*);
static sp<IBinder> asBinder(const sp<IInterface>&);
protected:
virtual ~IInterface();
virtual IBinder* onAsBinder() = 0;
};
// ----------------------------------------------------------------------
/**
* If this is a local object and the descriptor matches, this will return the
* actual local object which is implementing the interface. Otherwise, this will
* return a proxy to the interface without checking the interface descriptor.
* This means that subsequent calls may fail with BAD_TYPE.
*/
template<typename INTERFACE>
inline sp<INTERFACE> interface_cast(const sp<IBinder>& obj)
{
return INTERFACE::asInterface(obj);
}
/**
* This is the same as interface_cast, except that it always checks to make sure
* the descriptor matches, and if it doesn't match, it will return nullptr.
*/
template<typename INTERFACE>
inline sp<INTERFACE> checked_interface_cast(const sp<IBinder>& obj)
{
if (obj->getInterfaceDescriptor() != INTERFACE::descriptor) {
return nullptr;
}
return interface_cast<INTERFACE>(obj);
}
// ----------------------------------------------------------------------
template<typename INTERFACE>
class BnInterface : public INTERFACE, public BBinder
{
public:
virtual sp<IInterface> queryLocalInterface(const String16& _descriptor);
virtual const String16& getInterfaceDescriptor() const;
protected:
typedef INTERFACE BaseInterface;
virtual IBinder* onAsBinder();
};
// ----------------------------------------------------------------------
template<typename INTERFACE>
class BpInterface : public INTERFACE, public BpRefBase
{
public:
explicit BpInterface(const sp<IBinder>& remote);
protected:
typedef INTERFACE BaseInterface;
virtual IBinder* onAsBinder();
};
// ----------------------------------------------------------------------
#define DECLARE_META_INTERFACE(INTERFACE) \
public: \
static const ::android::String16 descriptor; \
static ::android::sp<I##INTERFACE> asInterface( \
const ::android::sp<::android::IBinder>& obj); \
virtual const ::android::String16& getInterfaceDescriptor() const; \
I##INTERFACE(); \
virtual ~I##INTERFACE(); \
static bool setDefaultImpl(std::unique_ptr<I##INTERFACE> impl); \
static const std::unique_ptr<I##INTERFACE>& getDefaultImpl(); \
private: \
static std::unique_ptr<I##INTERFACE> default_impl; \
public: \
#define __IINTF_CONCAT(x, y) (x ## y)
#ifndef DO_NOT_CHECK_MANUAL_BINDER_INTERFACES
#define IMPLEMENT_META_INTERFACE(INTERFACE, NAME) \
static_assert(internal::allowedManualInterface(NAME), \
"b/64223827: Manually written binder interfaces are " \
"considered error prone and frequently have bugs. " \
"The preferred way to add interfaces is to define " \
"an .aidl file to auto-generate the interface. If " \
"an interface must be manually written, add its " \
"name to the whitelist."); \
DO_NOT_DIRECTLY_USE_ME_IMPLEMENT_META_INTERFACE(INTERFACE, NAME) \
#else
#define IMPLEMENT_META_INTERFACE(INTERFACE, NAME) \
DO_NOT_DIRECTLY_USE_ME_IMPLEMENT_META_INTERFACE(INTERFACE, NAME) \
#endif
#define DO_NOT_DIRECTLY_USE_ME_IMPLEMENT_META_INTERFACE(INTERFACE, NAME)\
const ::android::StaticString16 \
I##INTERFACE##_descriptor_static_str16(__IINTF_CONCAT(u, NAME));\
const ::android::String16 I##INTERFACE::descriptor( \
I##INTERFACE##_descriptor_static_str16); \
const ::android::String16& \
I##INTERFACE::getInterfaceDescriptor() const { \
return I##INTERFACE::descriptor; \
} \
::android::sp<I##INTERFACE> I##INTERFACE::asInterface( \
const ::android::sp<::android::IBinder>& obj) \
{ \
::android::sp<I##INTERFACE> intr; \
if (obj != nullptr) { \
intr = static_cast<I##INTERFACE*>( \
obj->queryLocalInterface( \
I##INTERFACE::descriptor).get()); \
if (intr == nullptr) { \
intr = new Bp##INTERFACE(obj); \
} \
} \
return intr; \
} \
std::unique_ptr<I##INTERFACE> I##INTERFACE::default_impl; \
bool I##INTERFACE::setDefaultImpl(std::unique_ptr<I##INTERFACE> impl)\
{ \
/* Only one user of this interface can use this function */ \
/* at a time. This is a heuristic to detect if two different */ \
/* users in the same process use this function. */ \
assert(!I##INTERFACE::default_impl); \
if (impl) { \
I##INTERFACE::default_impl = std::move(impl); \
return true; \
} \
return false; \
} \
const std::unique_ptr<I##INTERFACE>& I##INTERFACE::getDefaultImpl() \
{ \
return I##INTERFACE::default_impl; \
} \
I##INTERFACE::I##INTERFACE() { } \
I##INTERFACE::~I##INTERFACE() { } \
#define CHECK_INTERFACE(interface, data, reply) \
do { \
if (!(data).checkInterface(this)) { return PERMISSION_DENIED; } \
} while (false) \
// ----------------------------------------------------------------------
// No user-serviceable parts after this...
template<typename INTERFACE>
inline sp<IInterface> BnInterface<INTERFACE>::queryLocalInterface(
const String16& _descriptor)
{
if (_descriptor == INTERFACE::descriptor) return this;
return nullptr;
}
template<typename INTERFACE>
inline const String16& BnInterface<INTERFACE>::getInterfaceDescriptor() const
{
return INTERFACE::getInterfaceDescriptor();
}
template<typename INTERFACE>
IBinder* BnInterface<INTERFACE>::onAsBinder()
{
return this;
}
template<typename INTERFACE>
inline BpInterface<INTERFACE>::BpInterface(const sp<IBinder>& remote)
: BpRefBase(remote)
{
}
template<typename INTERFACE>
inline IBinder* BpInterface<INTERFACE>::onAsBinder()
{
return remote();
}
// ----------------------------------------------------------------------
namespace internal {
constexpr const char* const kManualInterfaces[] = {
"android.app.IActivityManager",
"android.app.IUidObserver",
"android.drm.IDrm",
"android.dvr.IVsyncCallback",
"android.dvr.IVsyncService",
"android.gfx.tests.ICallback",
"android.gfx.tests.IIPCTest",
"android.gfx.tests.ISafeInterfaceTest",
"android.graphicsenv.IGpuService",
"android.gui.DisplayEventConnection",
"android.gui.IConsumerListener",
"android.gui.IGraphicBufferConsumer",
"android.gui.IRegionSamplingListener",
"android.gui.ITransactionComposerListener",
"android.gui.SensorEventConnection",
"android.gui.SensorServer",
"android.hardware.ICamera",
"android.hardware.ICameraClient",
"android.hardware.ICameraRecordingProxy",
"android.hardware.ICameraRecordingProxyListener",
"android.hardware.ICrypto",
"android.hardware.IOMXObserver",
"android.hardware.ISoundTrigger",
"android.hardware.ISoundTriggerClient",
"android.hardware.ISoundTriggerHwService",
"android.hardware.IStreamListener",
"android.hardware.IStreamSource",
"android.input.IInputFlinger",
"android.input.ISetInputWindowsListener",
"android.media.IAudioFlinger",
"android.media.IAudioFlingerClient",
"android.media.IAudioPolicyService",
"android.media.IAudioPolicyServiceClient",
"android.media.IAudioService",
"android.media.IAudioTrack",
"android.media.IDataSource",
"android.media.IDrmClient",
"android.media.IEffect",
"android.media.IEffectClient",
"android.media.IMediaCodecList",
"android.media.IMediaDrmService",
"android.media.IMediaExtractor",
"android.media.IMediaExtractorService",
"android.media.IMediaHTTPConnection",
"android.media.IMediaHTTPService",
"android.media.IMediaLogService",
"android.media.IMediaMetadataRetriever",
"android.media.IMediaMetricsService",
"android.media.IMediaPlayer",
"android.media.IMediaPlayerClient",
"android.media.IMediaPlayerService",
"android.media.IMediaRecorder",
"android.media.IMediaRecorderClient",
"android.media.IMediaResourceMonitor",
"android.media.IMediaSource",
"android.media.IRemoteDisplay",
"android.media.IRemoteDisplayClient",
"android.media.IResourceManagerClient",
"android.media.IResourceManagerService",
"android.os.IComplexTypeInterface",
"android.os.IPermissionController",
"android.os.IPingResponder",
"android.os.IPowerManager",
"android.os.IProcessInfoService",
"android.os.ISchedulingPolicyService",
"android.os.IStringConstants",
"android.os.storage.IObbActionListener",
"android.os.storage.IStorageEventListener",
"android.os.storage.IStorageManager",
"android.os.storage.IStorageShutdownObserver",
"android.service.vr.IPersistentVrStateCallbacks",
"android.service.vr.IVrManager",
"android.service.vr.IVrStateCallbacks",
"android.ui.ISurfaceComposer",
"android.ui.ISurfaceComposerClient",
"android.utils.IMemory",
"android.utils.IMemoryHeap",
"com.android.car.procfsinspector.IProcfsInspector",
"com.android.internal.app.IAppOpsCallback",
"com.android.internal.app.IAppOpsService",
"com.android.internal.app.IBatteryStats",
"com.android.internal.os.IResultReceiver",
"com.android.internal.os.IShellCallback",
"drm.IDrmManagerService",
"drm.IDrmServiceListener",
"IAAudioClient",
"IAAudioService",
"VtsFuzzer",
nullptr,
};
constexpr const char* const kDownstreamManualInterfaces[] = {
// Add downstream interfaces here.
nullptr,
};
constexpr bool equals(const char* a, const char* b) {
if (*a != *b) return false;
if (*a == '\0') return true;
return equals(a + 1, b + 1);
}
constexpr bool inList(const char* a, const char* const* whitelist) {
if (*whitelist == nullptr) return false;
if (equals(a, *whitelist)) return true;
return inList(a, whitelist + 1);
}
constexpr bool allowedManualInterface(const char* name) {
return inList(name, kManualInterfaces) ||
inList(name, kDownstreamManualInterfaces);
}
} // namespace internal
} // namespace android
#endif // ANDROID_IINTERFACE_H
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