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      1 /*
      2  * Copyright (C) 2013 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include <binder/AppOpsManager.h>
     18 #include <binder/Binder.h>
     19 #include <binder/IServiceManager.h>
     20 
     21 #include <utils/SystemClock.h>
     22 
     23 namespace android {
     24 
     25 static String16 _appops("appops");
     26 static pthread_mutex_t gTokenMutex = PTHREAD_MUTEX_INITIALIZER;
     27 static sp<IBinder> gToken;
     28 
     29 static const sp<IBinder>& getToken(const sp<IAppOpsService>& service) {
     30     pthread_mutex_lock(&gTokenMutex);
     31     if (gToken == NULL || gToken->pingBinder() != NO_ERROR) {
     32         gToken = service->getToken(new BBinder());
     33     }
     34     pthread_mutex_unlock(&gTokenMutex);
     35     return gToken;
     36 }
     37 
     38 AppOpsManager::AppOpsManager()
     39 {
     40 }
     41 
     42 sp<IAppOpsService> AppOpsManager::getService()
     43 {
     44     int64_t startTime = 0;
     45     mLock.lock();
     46     sp<IAppOpsService> service = mService;
     47     while (service == NULL || !IInterface::asBinder(service)->isBinderAlive()) {
     48         sp<IBinder> binder = defaultServiceManager()->checkService(_appops);
     49         if (binder == NULL) {
     50             // Wait for the app ops service to come back...
     51             if (startTime == 0) {
     52                 startTime = uptimeMillis();
     53                 ALOGI("Waiting for app ops service");
     54             } else if ((uptimeMillis()-startTime) > 10000) {
     55                 ALOGW("Waiting too long for app ops service, giving up");
     56                 return NULL;
     57             }
     58             sleep(1);
     59         } else {
     60             service = interface_cast<IAppOpsService>(binder);
     61             mService = service;
     62         }
     63     }
     64     mLock.unlock();
     65     return service;
     66 }
     67 
     68 int32_t AppOpsManager::checkOp(int32_t op, int32_t uid, const String16& callingPackage)
     69 {
     70     sp<IAppOpsService> service = getService();
     71     return service != NULL ? service->checkOperation(op, uid, callingPackage) : MODE_IGNORED;
     72 }
     73 
     74 int32_t AppOpsManager::noteOp(int32_t op, int32_t uid, const String16& callingPackage) {
     75     sp<IAppOpsService> service = getService();
     76     return service != NULL ? service->noteOperation(op, uid, callingPackage) : MODE_IGNORED;
     77 }
     78 
     79 int32_t AppOpsManager::startOp(int32_t op, int32_t uid, const String16& callingPackage) {
     80     sp<IAppOpsService> service = getService();
     81     return service != NULL ? service->startOperation(getToken(service), op, uid, callingPackage)
     82             : MODE_IGNORED;
     83 }
     84 
     85 void AppOpsManager::finishOp(int32_t op, int32_t uid, const String16& callingPackage) {
     86     sp<IAppOpsService> service = getService();
     87     if (service != NULL) {
     88         service->finishOperation(getToken(service), op, uid, callingPackage);
     89     }
     90 }
     91 
     92 void AppOpsManager::startWatchingMode(int32_t op, const String16& packageName,
     93         const sp<IAppOpsCallback>& callback) {
     94     sp<IAppOpsService> service = getService();
     95     if (service != NULL) {
     96         service->startWatchingMode(op, packageName, callback);
     97     }
     98 }
     99 
    100 void AppOpsManager::stopWatchingMode(const sp<IAppOpsCallback>& callback) {
    101     sp<IAppOpsService> service = getService();
    102     if (service != NULL) {
    103         service->stopWatchingMode(callback);
    104     }
    105 }
    106 
    107 int32_t AppOpsManager::permissionToOpCode(const String16& permission) {
    108     sp<IAppOpsService> service = getService();
    109     if (service != NULL) {
    110         return service->permissionToOpCode(permission);
    111     }
    112     return -1;
    113 }
    114 
    115 
    116 }; // namespace android
    117