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      1 /*
      2  * Copyright (C) 2006 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 package android.os;
     18 
     19 
     20 /**
     21  * Native implementation of the service manager.  Most clients will only
     22  * care about getDefault() and possibly asInterface().
     23  * @hide
     24  */
     25 public abstract class ServiceManagerNative extends Binder implements IServiceManager
     26 {
     27     /**
     28      * Cast a Binder object into a service manager interface, generating
     29      * a proxy if needed.
     30      */
     31     static public IServiceManager asInterface(IBinder obj)
     32     {
     33         if (obj == null) {
     34             return null;
     35         }
     36         IServiceManager in =
     37             (IServiceManager)obj.queryLocalInterface(descriptor);
     38         if (in != null) {
     39             return in;
     40         }
     41 
     42         return new ServiceManagerProxy(obj);
     43     }
     44 
     45     public ServiceManagerNative()
     46     {
     47         attachInterface(this, descriptor);
     48     }
     49 
     50     public boolean onTransact(int code, Parcel data, Parcel reply, int flags)
     51     {
     52         try {
     53             switch (code) {
     54             case IServiceManager.GET_SERVICE_TRANSACTION: {
     55                 data.enforceInterface(IServiceManager.descriptor);
     56                 String name = data.readString();
     57                 IBinder service = getService(name);
     58                 reply.writeStrongBinder(service);
     59                 return true;
     60             }
     61 
     62             case IServiceManager.CHECK_SERVICE_TRANSACTION: {
     63                 data.enforceInterface(IServiceManager.descriptor);
     64                 String name = data.readString();
     65                 IBinder service = checkService(name);
     66                 reply.writeStrongBinder(service);
     67                 return true;
     68             }
     69 
     70             case IServiceManager.ADD_SERVICE_TRANSACTION: {
     71                 data.enforceInterface(IServiceManager.descriptor);
     72                 String name = data.readString();
     73                 IBinder service = data.readStrongBinder();
     74                 addService(name, service);
     75                 return true;
     76             }
     77 
     78             case IServiceManager.LIST_SERVICES_TRANSACTION: {
     79                 data.enforceInterface(IServiceManager.descriptor);
     80                 String[] list = listServices();
     81                 reply.writeStringArray(list);
     82                 return true;
     83             }
     84 
     85             case IServiceManager.SET_PERMISSION_CONTROLLER_TRANSACTION: {
     86                 data.enforceInterface(IServiceManager.descriptor);
     87                 IPermissionController controller
     88                         = IPermissionController.Stub.asInterface(
     89                                 data.readStrongBinder());
     90                 setPermissionController(controller);
     91                 return true;
     92             }
     93             }
     94         } catch (RemoteException e) {
     95         }
     96 
     97         return false;
     98     }
     99 
    100     public IBinder asBinder()
    101     {
    102         return this;
    103     }
    104 }
    105 
    106 class ServiceManagerProxy implements IServiceManager {
    107     public ServiceManagerProxy(IBinder remote) {
    108         mRemote = remote;
    109     }
    110 
    111     public IBinder asBinder() {
    112         return mRemote;
    113     }
    114 
    115     public IBinder getService(String name) throws RemoteException {
    116         Parcel data = Parcel.obtain();
    117         Parcel reply = Parcel.obtain();
    118         data.writeInterfaceToken(IServiceManager.descriptor);
    119         data.writeString(name);
    120         mRemote.transact(GET_SERVICE_TRANSACTION, data, reply, 0);
    121         IBinder binder = reply.readStrongBinder();
    122         reply.recycle();
    123         data.recycle();
    124         return binder;
    125     }
    126 
    127     public IBinder checkService(String name) throws RemoteException {
    128         Parcel data = Parcel.obtain();
    129         Parcel reply = Parcel.obtain();
    130         data.writeInterfaceToken(IServiceManager.descriptor);
    131         data.writeString(name);
    132         mRemote.transact(CHECK_SERVICE_TRANSACTION, data, reply, 0);
    133         IBinder binder = reply.readStrongBinder();
    134         reply.recycle();
    135         data.recycle();
    136         return binder;
    137     }
    138 
    139     public void addService(String name, IBinder service)
    140             throws RemoteException {
    141         Parcel data = Parcel.obtain();
    142         Parcel reply = Parcel.obtain();
    143         data.writeInterfaceToken(IServiceManager.descriptor);
    144         data.writeString(name);
    145         data.writeStrongBinder(service);
    146         mRemote.transact(ADD_SERVICE_TRANSACTION, data, reply, 0);
    147         reply.recycle();
    148         data.recycle();
    149     }
    150 
    151     public String[] listServices() throws RemoteException {
    152         Parcel data = Parcel.obtain();
    153         Parcel reply = Parcel.obtain();
    154         data.writeInterfaceToken(IServiceManager.descriptor);
    155         mRemote.transact(LIST_SERVICES_TRANSACTION, data, reply, 0);
    156         String[] list = reply.readStringArray();
    157         reply.recycle();
    158         data.recycle();
    159         return list;
    160     }
    161 
    162     public void setPermissionController(IPermissionController controller)
    163             throws RemoteException {
    164         Parcel data = Parcel.obtain();
    165         Parcel reply = Parcel.obtain();
    166         data.writeInterfaceToken(IServiceManager.descriptor);
    167         data.writeStrongBinder(controller.asBinder());
    168         mRemote.transact(SET_PERMISSION_CONTROLLER_TRANSACTION, data, reply, 0);
    169         reply.recycle();
    170         data.recycle();
    171     }
    172 
    173     private IBinder mRemote;
    174 }
    175