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      1 /*
      2  * Copyright (C) 2012 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 <stdint.h>
     18 #include <sys/types.h>
     19 
     20 #include <binder/PermissionCache.h>
     21 
     22 #include <private/android_filesystem_config.h>
     23 
     24 #include "Client.h"
     25 #include "Layer.h"
     26 #include "SurfaceFlinger.h"
     27 
     28 namespace android {
     29 
     30 // ---------------------------------------------------------------------------
     31 
     32 const String16 sAccessSurfaceFlinger("android.permission.ACCESS_SURFACE_FLINGER");
     33 
     34 // ---------------------------------------------------------------------------
     35 
     36 Client::Client(const sp<SurfaceFlinger>& flinger)
     37     : mFlinger(flinger)
     38 {
     39 }
     40 
     41 Client::~Client()
     42 {
     43     const size_t count = mLayers.size();
     44     for (size_t i=0 ; i<count ; i++) {
     45         sp<Layer> layer(mLayers.valueAt(i).promote());
     46         if (layer != 0) {
     47             mFlinger->removeLayer(layer);
     48         }
     49     }
     50 }
     51 
     52 status_t Client::initCheck() const {
     53     return NO_ERROR;
     54 }
     55 
     56 void Client::attachLayer(const sp<IBinder>& handle, const sp<Layer>& layer)
     57 {
     58     Mutex::Autolock _l(mLock);
     59     mLayers.add(handle, layer);
     60 }
     61 
     62 void Client::detachLayer(const Layer* layer)
     63 {
     64     Mutex::Autolock _l(mLock);
     65     // we do a linear search here, because this doesn't happen often
     66     const size_t count = mLayers.size();
     67     for (size_t i=0 ; i<count ; i++) {
     68         if (mLayers.valueAt(i) == layer) {
     69             mLayers.removeItemsAt(i, 1);
     70             break;
     71         }
     72     }
     73 }
     74 sp<Layer> Client::getLayerUser(const sp<IBinder>& handle) const
     75 {
     76     Mutex::Autolock _l(mLock);
     77     sp<Layer> lbc;
     78     wp<Layer> layer(mLayers.valueFor(handle));
     79     if (layer != 0) {
     80         lbc = layer.promote();
     81         ALOGE_IF(lbc==0, "getLayerUser(name=%p) is dead", handle.get());
     82     }
     83     return lbc;
     84 }
     85 
     86 
     87 status_t Client::onTransact(
     88     uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
     89 {
     90     // these must be checked
     91      IPCThreadState* ipc = IPCThreadState::self();
     92      const int pid = ipc->getCallingPid();
     93      const int uid = ipc->getCallingUid();
     94      const int self_pid = getpid();
     95      if (CC_UNLIKELY(pid != self_pid && uid != AID_GRAPHICS && uid != 0)) {
     96          // we're called from a different process, do the real check
     97          if (!PermissionCache::checkCallingPermission(sAccessSurfaceFlinger))
     98          {
     99              ALOGE("Permission Denial: "
    100                      "can't openGlobalTransaction pid=%d, uid=%d", pid, uid);
    101              return PERMISSION_DENIED;
    102          }
    103      }
    104      return BnSurfaceComposerClient::onTransact(code, data, reply, flags);
    105 }
    106 
    107 
    108 status_t Client::createSurface(
    109         const String8& name,
    110         uint32_t w, uint32_t h, PixelFormat format, uint32_t flags,
    111         sp<IBinder>* handle,
    112         sp<IGraphicBufferProducer>* gbp)
    113 {
    114     /*
    115      * createSurface must be called from the GL thread so that it can
    116      * have access to the GL context.
    117      */
    118 
    119     class MessageCreateLayer : public MessageBase {
    120         SurfaceFlinger* flinger;
    121         Client* client;
    122         sp<IBinder>* handle;
    123         sp<IGraphicBufferProducer>* gbp;
    124         status_t result;
    125         const String8& name;
    126         uint32_t w, h;
    127         PixelFormat format;
    128         uint32_t flags;
    129     public:
    130         MessageCreateLayer(SurfaceFlinger* flinger,
    131                 const String8& name, Client* client,
    132                 uint32_t w, uint32_t h, PixelFormat format, uint32_t flags,
    133                 sp<IBinder>* handle,
    134                 sp<IGraphicBufferProducer>* gbp)
    135             : flinger(flinger), client(client),
    136               handle(handle), gbp(gbp),
    137               name(name), w(w), h(h), format(format), flags(flags) {
    138         }
    139         status_t getResult() const { return result; }
    140         virtual bool handler() {
    141             result = flinger->createLayer(name, client, w, h, format, flags,
    142                     handle, gbp);
    143             return true;
    144         }
    145     };
    146 
    147     sp<MessageBase> msg = new MessageCreateLayer(mFlinger.get(),
    148             name, this, w, h, format, flags, handle, gbp);
    149     mFlinger->postMessageSync(msg);
    150     return static_cast<MessageCreateLayer*>( msg.get() )->getResult();
    151 }
    152 
    153 status_t Client::destroySurface(const sp<IBinder>& handle) {
    154     return mFlinger->onLayerRemoved(this, handle);
    155 }
    156 
    157 // ---------------------------------------------------------------------------
    158 }; // namespace android
    159