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      1 /*
      2  * Copyright (C) 2005 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 #define LOG_TAG "PermissionController"
     18 
     19 #include <binder/IPermissionController.h>
     20 
     21 #include <utils/Log.h>
     22 #include <binder/Parcel.h>
     23 #include <utils/String8.h>
     24 
     25 #include <private/binder/Static.h>
     26 
     27 namespace android {
     28 
     29 // ----------------------------------------------------------------------
     30 
     31 class BpPermissionController : public BpInterface<IPermissionController>
     32 {
     33 public:
     34     BpPermissionController(const sp<IBinder>& impl)
     35         : BpInterface<IPermissionController>(impl)
     36     {
     37     }
     38 
     39     virtual bool checkPermission(const String16& permission, int32_t pid, int32_t uid)
     40     {
     41         Parcel data, reply;
     42         data.writeInterfaceToken(IPermissionController::getInterfaceDescriptor());
     43         data.writeString16(permission);
     44         data.writeInt32(pid);
     45         data.writeInt32(uid);
     46         remote()->transact(CHECK_PERMISSION_TRANSACTION, data, &reply);
     47         // fail on exception
     48         if (reply.readExceptionCode() != 0) return 0;
     49         return reply.readInt32() != 0;
     50     }
     51 };
     52 
     53 IMPLEMENT_META_INTERFACE(PermissionController, "android.os.IPermissionController");
     54 
     55 // ----------------------------------------------------------------------
     56 
     57 status_t BnPermissionController::onTransact(
     58     uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
     59 {
     60     //printf("PermissionController received: "); data.print();
     61     switch(code) {
     62         case CHECK_PERMISSION_TRANSACTION: {
     63             CHECK_INTERFACE(IPermissionController, data, reply);
     64             String16 permission = data.readString16();
     65             int32_t pid = data.readInt32();
     66             int32_t uid = data.readInt32();
     67             bool res = checkPermission(permission, pid, uid);
     68             reply->writeNoException();
     69             reply->writeInt32(res ? 1 : 0);
     70             return NO_ERROR;
     71         } break;
     72         default:
     73             return BBinder::onTransact(code, data, reply, flags);
     74     }
     75 }
     76 
     77 }; // namespace android
     78