text: /*
   * Copyright (C) 2010 The Android Open Source Project
   * Copyright (C) 2012-2016, The Linux Foundation. All rights reserved.
   *
   * Not a Contribution, Apache license notifications and license are
   * retained for attribution purposes only.
  
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  #include <fcntl.h>
  #include <stdint.h>
  #include <sys/types.h>
  #include <binder/Parcel.h>
  #include <binder/IBinder.h>
  #include <binder/IInterface.h>
  #include <binder/IPCThreadState.h>
  #include <cutils/android_filesystem_config.h>
  #include <utils/Errors.h>
  #include <IQService.h>
  
  #define QSERVICE_DEBUG 0
  
  using namespace android;
  using namespace qClient;
  
  // ---------------------------------------------------------------------------
  
  namespace qService {
  
  class BpQService : public BpInterface<IQService>
  {
  public:
      BpQService(const sp<IBinder>& impl)
          : BpInterface<IQService>(impl) {}
  
      virtual void connect(const sp<IQClient>& client) {
          ALOGD_IF(QSERVICE_DEBUG, "%s: connect HWC client", __FUNCTION__);
          Parcel data, reply;
          data.writeInterfaceToken(IQService::getInterfaceDescriptor());
          data.writeStrongBinder(IInterface::asBinder(client));
          remote()->transact(CONNECT_HWC_CLIENT, data, &reply);
      }
  
      virtual void connect(const sp<IQHDMIClient>& client) {
          ALOGD_IF(QSERVICE_DEBUG, "%s: connect HDMI client", __FUNCTION__);
          Parcel data, reply;
          data.writeInterfaceToken(IQService::getInterfaceDescriptor());
          data.writeStrongBinder(IInterface::asBinder(client));
          remote()->transact(CONNECT_HDMI_CLIENT, data, &reply);
      }
  
  
      virtual android::status_t dispatch(uint32_t command, const Parcel* inParcel,
              Parcel* outParcel) {
          ALOGD_IF(QSERVICE_DEBUG, "%s: dispatch in:%p", __FUNCTION__, inParcel);
          status_t err = (status_t) android::FAILED_TRANSACTION;
          Parcel data;
          Parcel *reply = outParcel;
          data.writeInterfaceToken(IQService::getInterfaceDescriptor());
          if (inParcel && inParcel->dataSize() > 0)
              data.appendFrom(inParcel, 0, inParcel->dataSize());
          err = remote()->transact(command, data, reply);
          return err;
      }
  };
  
  IMPLEMENT_META_INTERFACE(QService, "android.display.IQService");
  
  // ----------------------------------------------------------------------
  
  status_t BnQService::onTransact(
      uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
  {
      ALOGD_IF(QSERVICE_DEBUG, "%s: code: %d", __FUNCTION__, code);
      // IPC should be from certain processes only
      IPCThreadState* ipc = IPCThreadState::self();
      const int callerPid = ipc->getCallingPid();
      const int callerUid = ipc->getCallingUid();
  
      const bool permission = (callerUid == AID_MEDIA ||
              callerUid == AID_GRAPHICS ||
              callerUid == AID_ROOT ||
              callerUid == AID_CAMERASERVER ||
              callerUid == AID_AUDIO ||
              callerUid == AID_SYSTEM ||
              callerUid == AID_MEDIA_CODEC);
  
      if (code == CONNECT_HWC_CLIENT) {
          CHECK_INTERFACE(IQService, data, reply);
          if(callerUid != AID_GRAPHICS) {
              ALOGE("display.qservice CONNECT_HWC_CLIENT access denied: pid=%d uid=%d",
                     callerPid, callerUid);
              return PERMISSION_DENIED;
          }
          sp<IQClient> client =
                  interface_cast<IQClient>(data.readStrongBinder());
          connect(client);
          return NO_ERROR;
      } else if(code == CONNECT_HDMI_CLIENT) {
          CHECK_INTERFACE(IQService, data, reply);
          if(callerUid != AID_SYSTEM && callerUid != AID_ROOT) {
              ALOGE("display.qservice CONNECT_HDMI_CLIENT access denied: pid=%d uid=%d",
                     callerPid, callerUid);
              return PERMISSION_DENIED;
          }
          sp<IQHDMIClient> client =
                  interface_cast<IQHDMIClient>(data.readStrongBinder());
          connect(client);
          return NO_ERROR;
      } else if (code > COMMAND_LIST_START && code < COMMAND_LIST_END) {
          if(!permission) {
              ALOGE("display.qservice access denied: command=%d pid=%d uid=%d",
                     code, callerPid, callerUid);
              return PERMISSION_DENIED;
          }
          CHECK_INTERFACE(IQService, data, reply);
          dispatch(code, &data, reply);
          return NO_ERROR;
      } else {
          return BBinder::onTransact(code, data, reply, flags);
      }
  }
  
  }; // namespace qService
  