content: /*
   * Copyright (C) 2018 The Android Open Source Project
   *
   * 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.
   */
  
  package com.android.server.wifi;
  
  import android.content.Context;
  import android.net.NetworkCapabilities;
  import android.net.NetworkFactory;
  import android.net.NetworkRequest;
  import android.os.Looper;
  import android.util.Log;
  
  import java.io.FileDescriptor;
  import java.io.PrintWriter;
  
  /**
   * Network factory to handle untrusted (used for {@link ScoredNetworkEvaluator}) wifi network
   * requests.
   */
  public class UntrustedWifiNetworkFactory extends NetworkFactory {
      private static final String TAG = "UntrustedWifiNetworkFactory";
      private static final int SCORE_FILTER = Integer.MAX_VALUE;
  
      private final WifiConnectivityManager mWifiConnectivityManager;
      private int mConnectionReqCount = 0;
  
      public UntrustedWifiNetworkFactory(Looper l, Context c, NetworkCapabilities f,
                                         WifiConnectivityManager connectivityManager) {
          super(l, c, TAG, f);
          mWifiConnectivityManager = connectivityManager;
  
          setScoreFilter(SCORE_FILTER);
      }
  
      @Override
      protected void needNetworkFor(NetworkRequest networkRequest, int score) {
          if (!networkRequest.networkCapabilities.hasCapability(
                  NetworkCapabilities.NET_CAPABILITY_TRUSTED)) {
              if (++mConnectionReqCount == 1) {
                  mWifiConnectivityManager.setUntrustedConnectionAllowed(true);
              }
          }
      }
  
      @Override
      protected void releaseNetworkFor(NetworkRequest networkRequest) {
          if (!networkRequest.networkCapabilities.hasCapability(
                  NetworkCapabilities.NET_CAPABILITY_TRUSTED)) {
              if (mConnectionReqCount == 0) {
                  Log.e(TAG, "No valid network request to release");
                  return;
              }
              if (--mConnectionReqCount == 0) {
                  mWifiConnectivityManager.setUntrustedConnectionAllowed(false);
              }
          }
      }
  
      @Override
      public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
          super.dump(fd, pw, args);
          pw.println(TAG + ": mConnectionReqCount " + mConnectionReqCount);
      }
  
      /**
       * Check if there is at-least one connection request.
       */
      public boolean hasConnectionRequests() {
          return mConnectionReqCount > 0;
      }
  }
  
  