/*
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* Copyright (C) 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <mutex>
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#include <binder/AppOpsManager.h>
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#include <binder/Binder.h>
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#include <binder/IServiceManager.h>
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#include <utils/SystemClock.h>
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namespace android {
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namespace {
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#if defined(__BRILLO__)
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// Because Brillo has no application model, security policy is managed
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// statically (at build time) with SELinux controls.
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// As a consequence, it also never runs the AppOpsManager service.
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const int APP_OPS_MANAGER_UNAVAILABLE_MODE = AppOpsManager::MODE_ALLOWED;
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#else
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const int APP_OPS_MANAGER_UNAVAILABLE_MODE = AppOpsManager::MODE_IGNORED;
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#endif // defined(__BRILLO__)
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} // namespace
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static String16 _appops("appops");
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static pthread_mutex_t gTokenMutex = PTHREAD_MUTEX_INITIALIZER;
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static sp<IBinder> gToken;
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static const sp<IBinder>& getToken(const sp<IAppOpsService>& service) {
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pthread_mutex_lock(&gTokenMutex);
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if (gToken == nullptr || gToken->pingBinder() != NO_ERROR) {
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gToken = service->getToken(new BBinder());
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}
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pthread_mutex_unlock(&gTokenMutex);
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return gToken;
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}
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AppOpsManager::AppOpsManager()
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{
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}
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#if defined(__BRILLO__)
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// There is no AppOpsService on Brillo
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sp<IAppOpsService> AppOpsManager::getService() { return NULL; }
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#else
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sp<IAppOpsService> AppOpsManager::getService()
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{
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std::lock_guard<Mutex> scoped_lock(mLock);
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int64_t startTime = 0;
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sp<IAppOpsService> service = mService;
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while (service == nullptr || !IInterface::asBinder(service)->isBinderAlive()) {
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sp<IBinder> binder = defaultServiceManager()->checkService(_appops);
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if (binder == nullptr) {
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// Wait for the app ops service to come back...
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if (startTime == 0) {
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startTime = uptimeMillis();
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ALOGI("Waiting for app ops service");
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} else if ((uptimeMillis()-startTime) > 10000) {
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ALOGW("Waiting too long for app ops service, giving up");
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service = nullptr;
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break;
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}
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sleep(1);
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} else {
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service = interface_cast<IAppOpsService>(binder);
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mService = service;
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}
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}
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return service;
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}
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#endif // defined(__BRILLO__)
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int32_t AppOpsManager::checkOp(int32_t op, int32_t uid, const String16& callingPackage)
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{
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sp<IAppOpsService> service = getService();
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return service != nullptr
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? service->checkOperation(op, uid, callingPackage)
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: APP_OPS_MANAGER_UNAVAILABLE_MODE;
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}
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int32_t AppOpsManager::checkAudioOpNoThrow(int32_t op, int32_t usage, int32_t uid,
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const String16& callingPackage) {
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sp<IAppOpsService> service = getService();
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return service != nullptr
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? service->checkAudioOperation(op, usage, uid, callingPackage)
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: APP_OPS_MANAGER_UNAVAILABLE_MODE;
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}
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int32_t AppOpsManager::noteOp(int32_t op, int32_t uid, const String16& callingPackage) {
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sp<IAppOpsService> service = getService();
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return service != nullptr
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? service->noteOperation(op, uid, callingPackage)
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: APP_OPS_MANAGER_UNAVAILABLE_MODE;
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}
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int32_t AppOpsManager::startOpNoThrow(int32_t op, int32_t uid, const String16& callingPackage,
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bool startIfModeDefault) {
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sp<IAppOpsService> service = getService();
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return service != nullptr
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? service->startOperation(getToken(service), op, uid, callingPackage,
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startIfModeDefault) : APP_OPS_MANAGER_UNAVAILABLE_MODE;
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}
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void AppOpsManager::finishOp(int32_t op, int32_t uid, const String16& callingPackage) {
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sp<IAppOpsService> service = getService();
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if (service != nullptr) {
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service->finishOperation(getToken(service), op, uid, callingPackage);
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}
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}
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void AppOpsManager::startWatchingMode(int32_t op, const String16& packageName,
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const sp<IAppOpsCallback>& callback) {
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sp<IAppOpsService> service = getService();
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if (service != nullptr) {
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service->startWatchingMode(op, packageName, callback);
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}
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}
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void AppOpsManager::stopWatchingMode(const sp<IAppOpsCallback>& callback) {
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sp<IAppOpsService> service = getService();
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if (service != nullptr) {
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service->stopWatchingMode(callback);
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}
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}
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int32_t AppOpsManager::permissionToOpCode(const String16& permission) {
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sp<IAppOpsService> service = getService();
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if (service != nullptr) {
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return service->permissionToOpCode(permission);
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}
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return -1;
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}
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}; // namespace android
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