| /* |
| * Copyright (C) 2014 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; |
| |
| import android.Manifest.permission; |
| import android.content.Context; |
| import android.content.SharedPreferences; |
| import android.content.pm.PackageManager; |
| import android.net.INetworkScoreService; |
| import android.net.NetworkKey; |
| import android.net.NetworkScorerAppManager; |
| import android.net.RssiCurve; |
| import android.net.ScoredNetwork; |
| import android.text.TextUtils; |
| |
| import com.android.internal.R; |
| |
| import java.io.FileDescriptor; |
| import java.io.PrintWriter; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| /** |
| * Backing service for {@link android.net.NetworkScoreManager}. |
| * @hide |
| */ |
| public class NetworkScoreService extends INetworkScoreService.Stub { |
| private static final String TAG = "NetworkScoreService"; |
| |
| /** SharedPreference bit set to true after the service is first initialized. */ |
| private static final String PREF_SCORING_PROVISIONED = "is_provisioned"; |
| |
| private final Context mContext; |
| |
| // TODO: Delete this temporary class once we have a real place for scores. |
| private final Map<NetworkKey, RssiCurve> mScoredNetworks; |
| |
| public NetworkScoreService(Context context) { |
| mContext = context; |
| mScoredNetworks = new HashMap<>(); |
| } |
| |
| /** Called when the system is ready to run third-party code but before it actually does so. */ |
| void systemReady() { |
| SharedPreferences prefs = mContext.getSharedPreferences(TAG, Context.MODE_PRIVATE); |
| if (!prefs.getBoolean(PREF_SCORING_PROVISIONED, false)) { |
| // On first run, we try to initialize the scorer to the one configured at build time. |
| // This will be a no-op if the scorer isn't actually valid. |
| String defaultPackage = mContext.getResources().getString( |
| R.string.config_defaultNetworkScorerPackageName); |
| if (!TextUtils.isEmpty(defaultPackage)) { |
| NetworkScorerAppManager.setActiveScorer(mContext, defaultPackage); |
| } |
| prefs.edit().putBoolean(PREF_SCORING_PROVISIONED, true).apply(); |
| } |
| } |
| |
| @Override |
| public boolean updateScores(ScoredNetwork[] networks) { |
| if (!NetworkScorerAppManager.isCallerActiveScorer(mContext, getCallingUid())) { |
| throw new SecurityException("Caller with UID " + getCallingUid() + |
| " is not the active scorer."); |
| } |
| |
| // TODO: Propagate these scores down to the network subsystem layer instead of just holding |
| // them in memory. |
| for (ScoredNetwork network : networks) { |
| mScoredNetworks.put(network.networkKey, network.rssiCurve); |
| } |
| |
| return true; |
| } |
| |
| @Override |
| public boolean clearScores() { |
| // Only the active scorer or the system (who can broadcast BROADCAST_SCORE_NETWORKS) should |
| // be allowed to flush all scores. |
| if (NetworkScorerAppManager.isCallerActiveScorer(mContext, getCallingUid()) || |
| mContext.checkCallingOrSelfPermission(permission.BROADCAST_SCORE_NETWORKS) == |
| PackageManager.PERMISSION_GRANTED) { |
| clearInternal(); |
| return true; |
| } else { |
| throw new SecurityException( |
| "Caller is neither the active scorer nor the scorer manager."); |
| } |
| } |
| |
| @Override |
| public boolean setActiveScorer(String packageName) { |
| mContext.enforceCallingOrSelfPermission(permission.BROADCAST_SCORE_NETWORKS, TAG); |
| // Preemptively clear scores even though the set operation could fail. We do this for safety |
| // as scores should never be compared across apps; in practice, Settings should only be |
| // allowing valid apps to be set as scorers, so failure here should be rare. |
| clearInternal(); |
| return NetworkScorerAppManager.setActiveScorer(mContext, packageName); |
| } |
| |
| /** Clear scores. Callers are responsible for checking permissions as appropriate. */ |
| private void clearInternal() { |
| // TODO: Propagate the flush down to the network subsystem layer. |
| mScoredNetworks.clear(); |
| } |
| |
| @Override |
| protected void dump(FileDescriptor fd, PrintWriter writer, String[] args) { |
| mContext.enforceCallingOrSelfPermission(permission.DUMP, TAG); |
| String currentScorer = NetworkScorerAppManager.getActiveScorer(mContext); |
| if (currentScorer == null) { |
| writer.println("Scoring is disabled."); |
| return; |
| } |
| writer.println("Current scorer: " + currentScorer); |
| if (mScoredNetworks.isEmpty()) { |
| writer.println("No networks scored."); |
| } else { |
| for (Map.Entry<NetworkKey, RssiCurve> entry : mScoredNetworks.entrySet()) { |
| writer.println(entry.getKey() + ": " + entry.getValue()); |
| } |
| } |
| } |
| } |