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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 #include <binder/IPCThreadState.h>
     22 
     23 #include <private/android_filesystem_config.h>
     24 
     25 #include "Client.h"
     26 #include "Layer.h"
     27 #include "SurfaceFlinger.h"
     28 
     29 namespace android {
     30 
     31 // ---------------------------------------------------------------------------
     32 
     33 const String16 sAccessSurfaceFlinger("android.permission.ACCESS_SURFACE_FLINGER");
     34 
     35 // ---------------------------------------------------------------------------
     36 
     37 Client::Client(const sp<SurfaceFlinger>& flinger)
     38     : mFlinger(flinger)
     39 {
     40 }
     41 
     42 Client::~Client()
     43 {
     44     const size_t count = mLayers.size();
     45     for (size_t i=0 ; i<count ; i++) {
     46         sp<Layer> layer(mLayers.valueAt(i).promote());
     47         if (layer != 0) {
     48             mFlinger->removeLayer(layer);
     49         }
     50     }
     51 }
     52 
     53 status_t Client::initCheck() const {
     54     return NO_ERROR;
     55 }
     56 
     57 void Client::attachLayer(const sp<IBinder>& handle, const sp<Layer>& layer)
     58 {
     59     Mutex::Autolock _l(mLock);
     60     mLayers.add(handle, layer);
     61 }
     62 
     63 void Client::detachLayer(const Layer* layer)
     64 {
     65     Mutex::Autolock _l(mLock);
     66     // we do a linear search here, because this doesn't happen often
     67     const size_t count = mLayers.size();
     68     for (size_t i=0 ; i<count ; i++) {
     69         if (mLayers.valueAt(i) == layer) {
     70             mLayers.removeItemsAt(i, 1);
     71             break;
     72         }
     73     }
     74 }
     75 sp<Layer> Client::getLayerUser(const sp<IBinder>& handle) const
     76 {
     77     Mutex::Autolock _l(mLock);
     78     sp<Layer> lbc;
     79     wp<Layer> layer(mLayers.valueFor(handle));
     80     if (layer != 0) {
     81         lbc = layer.promote();
     82         ALOGE_IF(lbc==0, "getLayerUser(name=%p) is dead", handle.get());
     83     }
     84     return lbc;
     85 }
     86 
     87 
     88 status_t Client::onTransact(
     89     uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
     90 {
     91     // these must be checked
     92      IPCThreadState* ipc = IPCThreadState::self();
     93      const int pid = ipc->getCallingPid();
     94      const int uid = ipc->getCallingUid();
     95      const int self_pid = getpid();
     96      if (CC_UNLIKELY(pid != self_pid && uid != AID_GRAPHICS && uid != 0)) {
     97          // we're called from a different process, do the real check
     98          if (!PermissionCache::checkCallingPermission(sAccessSurfaceFlinger))
     99          {
    100              ALOGE("Permission Denial: "
    101                      "can't openGlobalTransaction pid=%d, uid=%d", pid, uid);
    102              return PERMISSION_DENIED;
    103          }
    104      }
    105      return BnSurfaceComposerClient::onTransact(code, data, reply, flags);
    106 }
    107 
    108 
    109 status_t Client::createSurface(
    110         const String8& name,
    111         uint32_t w, uint32_t h, PixelFormat format, uint32_t flags,
    112         sp<IBinder>* handle,
    113         sp<IGraphicBufferProducer>* gbp)
    114 {
    115     /*
    116      * createSurface must be called from the GL thread so that it can
    117      * have access to the GL context.
    118      */
    119 
    120     class MessageCreateLayer : public MessageBase {
    121         SurfaceFlinger* flinger;
    122         Client* client;
    123         sp<IBinder>* handle;
    124         sp<IGraphicBufferProducer>* gbp;
    125         status_t result;
    126         const String8& name;
    127         uint32_t w, h;
    128         PixelFormat format;
    129         uint32_t flags;
    130     public:
    131         MessageCreateLayer(SurfaceFlinger* flinger,
    132                 const String8& name, Client* client,
    133                 uint32_t w, uint32_t h, PixelFormat format, uint32_t flags,
    134                 sp<IBinder>* handle,
    135                 sp<IGraphicBufferProducer>* gbp)
    136             : flinger(flinger), client(client),
    137               handle(handle), gbp(gbp),
    138               name(name), w(w), h(h), format(format), flags(flags) {
    139         }
    140         status_t getResult() const { return result; }
    141         virtual bool handler() {
    142             result = flinger->createLayer(name, client, w, h, format, flags,
    143                     handle, gbp);
    144             return true;
    145         }
    146     };
    147 
    148     sp<MessageBase> msg = new MessageCreateLayer(mFlinger.get(),
    149             name, this, w, h, format, flags, handle, gbp);
    150     mFlinger->postMessageSync(msg);
    151     return static_cast<MessageCreateLayer*>( msg.get() )->getResult();
    152 }
    153 
    154 status_t Client::destroySurface(const sp<IBinder>& handle) {
    155     return mFlinger->onLayerRemoved(this, handle);
    156 }
    157 
    158 // ---------------------------------------------------------------------------
    159 }; // namespace android
    160