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/*
* Copyright (C) 2024 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.
*/
#pragma once
#include <android/os/BnServiceManager.h>
#include <android/os/IServiceManager.h>
#include <binder/IPCThreadState.h>
#include <binder/Trace.h>
#include <map>
#include <memory>
namespace android {
class BinderCacheWithInvalidation
: public std::enable_shared_from_this<BinderCacheWithInvalidation> {
class BinderInvalidation : public IBinder::DeathRecipient {
public:
BinderInvalidation(std::weak_ptr<BinderCacheWithInvalidation> cache, const std::string& key)
: mCache(cache), mKey(key) {}
void binderDied(const wp<IBinder>& who) override {
sp<IBinder> binder = who.promote();
if (std::shared_ptr<BinderCacheWithInvalidation> cache = mCache.lock()) {
cache->removeItem(mKey, binder);
} else {
ALOGI("Binder Cache pointer expired: %s", mKey.c_str());
}
}
private:
std::weak_ptr<BinderCacheWithInvalidation> mCache;
std::string mKey;
};
struct Entry {
sp<IBinder> service;
sp<BinderInvalidation> deathRecipient;
};
public:
sp<IBinder> getItem(const std::string& key) const {
std::lock_guard<std::mutex> lock(mCacheMutex);
if (auto it = mCache.find(key); it != mCache.end()) {
return it->second.service;
}
return nullptr;
}
bool removeItem(const std::string& key, const sp<IBinder>& who) {
std::string traceStr;
uint64_t tag = ATRACE_TAG_AIDL;
if (atrace_is_tag_enabled(tag)) {
traceStr = "BinderCacheWithInvalidation::removeItem " + key;
}
binder::ScopedTrace aidlTrace(tag, traceStr.c_str());
std::lock_guard<std::mutex> lock(mCacheMutex);
if (auto it = mCache.find(key); it != mCache.end()) {
if (it->second.service == who) {
status_t result = who->unlinkToDeath(it->second.deathRecipient);
if (result != DEAD_OBJECT) {
ALOGW("Unlinking to dead binder resulted in: %d", result);
}
mCache.erase(key);
return true;
}
}
return false;
}
binder::Status setItem(const std::string& key, const sp<IBinder>& item) {
sp<BinderInvalidation> deathRecipient =
sp<BinderInvalidation>::make(shared_from_this(), key);
// linkToDeath if binder is a remote binder.
if (item->localBinder() == nullptr) {
status_t status = item->linkToDeath(deathRecipient);
if (status != android::OK) {
std::string traceStr;
uint64_t tag = ATRACE_TAG_AIDL;
if (atrace_is_tag_enabled(tag)) {
traceStr =
"BinderCacheWithInvalidation::setItem Failed LinkToDeath for service " +
key + " : " + std::to_string(status);
}
binder::ScopedTrace aidlTrace(tag, traceStr.c_str());
ALOGE("Failed to linkToDeath binder for service %s. Error: %d", key.c_str(),
status);
return binder::Status::fromStatusT(status);
}
}
binder::ScopedTrace aidlTrace(ATRACE_TAG_AIDL,
"BinderCacheWithInvalidation::setItem Successfully Cached");
std::lock_guard<std::mutex> lock(mCacheMutex);
mCache[key] = {.service = item, .deathRecipient = deathRecipient};
return binder::Status::ok();
}
bool isClientSideCachingEnabled(const std::string& serviceName);
private:
std::map<std::string, Entry> mCache;
mutable std::mutex mCacheMutex;
};
class BackendUnifiedServiceManager : public android::os::BnServiceManager {
public:
explicit BackendUnifiedServiceManager(const sp<os::IServiceManager>& impl);
binder::Status getService(const ::std::string& name, sp<IBinder>* _aidl_return) override;
binder::Status getService2(const ::std::string& name, os::Service* out) override;
binder::Status checkService(const ::std::string& name, os::Service* out) override;
binder::Status addService(const ::std::string& name, const sp<IBinder>& service,
bool allowIsolated, int32_t dumpPriority) override;
binder::Status listServices(int32_t dumpPriority,
::std::vector<::std::string>* _aidl_return) override;
binder::Status registerForNotifications(const ::std::string& name,
const sp<os::IServiceCallback>& callback) override;
binder::Status unregisterForNotifications(const ::std::string& name,
const sp<os::IServiceCallback>& callback) override;
binder::Status isDeclared(const ::std::string& name, bool* _aidl_return) override;
binder::Status getDeclaredInstances(const ::std::string& iface,
::std::vector<::std::string>* _aidl_return) override;
binder::Status updatableViaApex(const ::std::string& name,
::std::optional<::std::string>* _aidl_return) override;
binder::Status getUpdatableNames(const ::std::string& apexName,
::std::vector<::std::string>* _aidl_return) override;
binder::Status getConnectionInfo(const ::std::string& name,
::std::optional<os::ConnectionInfo>* _aidl_return) override;
binder::Status registerClientCallback(const ::std::string& name, const sp<IBinder>& service,
const sp<os::IClientCallback>& callback) override;
binder::Status tryUnregisterService(const ::std::string& name,
const sp<IBinder>& service) override;
binder::Status getServiceDebugInfo(::std::vector<os::ServiceDebugInfo>* _aidl_return) override;
void enableAddServiceCache(bool value) { mEnableAddServiceCache = value; }
// for legacy ABI
const String16& getInterfaceDescriptor() const override {
return mTheRealServiceManager->getInterfaceDescriptor();
}
private:
bool mEnableAddServiceCache = true;
std::shared_ptr<BinderCacheWithInvalidation> mCacheForGetService;
sp<os::IServiceManager> mTheRealServiceManager;
binder::Status toBinderService(const ::std::string& name, const os::Service& in,
os::Service* _out);
binder::Status updateCache(const std::string& serviceName, const os::Service& service);
binder::Status updateCache(const std::string& serviceName, const sp<IBinder>& binder,
bool isLazyService);
bool returnIfCached(const std::string& serviceName, os::Service* _out);
};
sp<BackendUnifiedServiceManager> getBackendUnifiedServiceManager();
android::binder::Status getInjectedAccessor(const std::string& name, android::os::Service* service);
void appendInjectedAccessorServices(std::vector<std::string>* list);
// Do not call any other service manager APIs that might take the accessor
// mutex because this will be holding it!
void forEachInjectedAccessorService(const std::function<void(const std::string&)>& f);
} // namespace android
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