Jeff Davidson | 6a4b220 | 2014-04-16 17:29:40 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2014 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 | package com.android.server; |
| 18 | |
| 19 | import android.Manifest.permission; |
| 20 | import android.content.Context; |
| 21 | import android.content.SharedPreferences; |
| 22 | import android.content.pm.PackageManager; |
| 23 | import android.net.INetworkScoreService; |
| 24 | import android.net.NetworkKey; |
| 25 | import android.net.NetworkScorerAppManager; |
| 26 | import android.net.RssiCurve; |
| 27 | import android.net.ScoredNetwork; |
| 28 | import android.text.TextUtils; |
| 29 | |
| 30 | import com.android.internal.R; |
| 31 | |
| 32 | import java.io.FileDescriptor; |
| 33 | import java.io.PrintWriter; |
| 34 | import java.util.HashMap; |
| 35 | import java.util.Map; |
| 36 | |
| 37 | /** |
| 38 | * Backing service for {@link android.net.NetworkScoreManager}. |
| 39 | * @hide |
| 40 | */ |
| 41 | public class NetworkScoreService extends INetworkScoreService.Stub { |
| 42 | private static final String TAG = "NetworkScoreService"; |
| 43 | |
| 44 | /** SharedPreference bit set to true after the service is first initialized. */ |
| 45 | private static final String PREF_SCORING_PROVISIONED = "is_provisioned"; |
| 46 | |
| 47 | private final Context mContext; |
| 48 | |
| 49 | // TODO: Delete this temporary class once we have a real place for scores. |
| 50 | private final Map<NetworkKey, RssiCurve> mScoredNetworks; |
| 51 | |
| 52 | public NetworkScoreService(Context context) { |
| 53 | mContext = context; |
| 54 | mScoredNetworks = new HashMap<>(); |
| 55 | } |
| 56 | |
| 57 | /** Called when the system is ready to run third-party code but before it actually does so. */ |
| 58 | void systemReady() { |
| 59 | SharedPreferences prefs = mContext.getSharedPreferences(TAG, Context.MODE_PRIVATE); |
| 60 | if (!prefs.getBoolean(PREF_SCORING_PROVISIONED, false)) { |
| 61 | // On first run, we try to initialize the scorer to the one configured at build time. |
| 62 | // This will be a no-op if the scorer isn't actually valid. |
| 63 | String defaultPackage = mContext.getResources().getString( |
| 64 | R.string.config_defaultNetworkScorerPackageName); |
| 65 | if (!TextUtils.isEmpty(defaultPackage)) { |
| 66 | NetworkScorerAppManager.setActiveScorer(mContext, defaultPackage); |
| 67 | } |
| 68 | prefs.edit().putBoolean(PREF_SCORING_PROVISIONED, true).apply(); |
| 69 | } |
| 70 | } |
| 71 | |
| 72 | @Override |
| 73 | public boolean updateScores(ScoredNetwork[] networks) { |
| 74 | if (!NetworkScorerAppManager.isCallerActiveScorer(mContext, getCallingUid())) { |
| 75 | throw new SecurityException("Caller with UID " + getCallingUid() + |
| 76 | " is not the active scorer."); |
| 77 | } |
| 78 | |
| 79 | // TODO: Propagate these scores down to the network subsystem layer instead of just holding |
| 80 | // them in memory. |
| 81 | for (ScoredNetwork network : networks) { |
| 82 | mScoredNetworks.put(network.networkKey, network.rssiCurve); |
| 83 | } |
| 84 | |
| 85 | return true; |
| 86 | } |
| 87 | |
| 88 | @Override |
| 89 | public boolean clearScores() { |
| 90 | // Only the active scorer or the system (who can broadcast BROADCAST_SCORE_NETWORKS) should |
| 91 | // be allowed to flush all scores. |
| 92 | if (NetworkScorerAppManager.isCallerActiveScorer(mContext, getCallingUid()) || |
| 93 | mContext.checkCallingOrSelfPermission(permission.BROADCAST_SCORE_NETWORKS) == |
| 94 | PackageManager.PERMISSION_GRANTED) { |
| 95 | clearInternal(); |
| 96 | return true; |
| 97 | } else { |
| 98 | throw new SecurityException( |
| 99 | "Caller is neither the active scorer nor the scorer manager."); |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | @Override |
| 104 | public boolean setActiveScorer(String packageName) { |
| 105 | mContext.enforceCallingOrSelfPermission(permission.BROADCAST_SCORE_NETWORKS, TAG); |
| 106 | // Preemptively clear scores even though the set operation could fail. We do this for safety |
| 107 | // as scores should never be compared across apps; in practice, Settings should only be |
| 108 | // allowing valid apps to be set as scorers, so failure here should be rare. |
| 109 | clearInternal(); |
| 110 | return NetworkScorerAppManager.setActiveScorer(mContext, packageName); |
| 111 | } |
| 112 | |
| 113 | /** Clear scores. Callers are responsible for checking permissions as appropriate. */ |
| 114 | private void clearInternal() { |
| 115 | // TODO: Propagate the flush down to the network subsystem layer. |
| 116 | mScoredNetworks.clear(); |
| 117 | } |
| 118 | |
| 119 | @Override |
| 120 | protected void dump(FileDescriptor fd, PrintWriter writer, String[] args) { |
| 121 | mContext.enforceCallingOrSelfPermission(permission.DUMP, TAG); |
| 122 | String currentScorer = NetworkScorerAppManager.getActiveScorer(mContext); |
| 123 | if (currentScorer == null) { |
| 124 | writer.println("Scoring is disabled."); |
| 125 | return; |
| 126 | } |
| 127 | writer.println("Current scorer: " + currentScorer); |
| 128 | if (mScoredNetworks.isEmpty()) { |
| 129 | writer.println("No networks scored."); |
| 130 | } else { |
| 131 | for (Map.Entry<NetworkKey, RssiCurve> entry : mScoredNetworks.entrySet()) { |
| 132 | writer.println(entry.getKey() + ": " + entry.getValue()); |
| 133 | } |
| 134 | } |
| 135 | } |
| 136 | } |