1 /* 2 * Copyright (C) 2017 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.settings.network; 18 19 import static android.net.ConnectivityManager.PRIVATE_DNS_MODE_OFF; 20 import static android.net.ConnectivityManager.PRIVATE_DNS_MODE_OPPORTUNISTIC; 21 import static android.net.ConnectivityManager.PRIVATE_DNS_MODE_PROVIDER_HOSTNAME; 22 import static android.provider.Settings.Global.PRIVATE_DNS_DEFAULT_MODE; 23 import static android.provider.Settings.Global.PRIVATE_DNS_MODE; 24 import static android.provider.Settings.Global.PRIVATE_DNS_SPECIFIER; 25 26 import android.content.Context; 27 import android.content.ContentResolver; 28 import android.content.res.Resources; 29 import android.database.ContentObserver; 30 import android.net.ConnectivityManager; 31 import android.net.ConnectivityManager.NetworkCallback; 32 import android.net.LinkProperties; 33 import android.net.Network; 34 import android.net.Uri; 35 import android.os.Handler; 36 import android.os.Looper; 37 import android.provider.Settings; 38 import android.support.v7.preference.Preference; 39 import android.support.v7.preference.PreferenceScreen; 40 41 import com.android.internal.util.ArrayUtils; 42 import com.android.settings.R; 43 import com.android.settings.core.BasePreferenceController; 44 import com.android.settings.core.PreferenceControllerMixin; 45 import com.android.settingslib.core.lifecycle.events.OnStart; 46 import com.android.settingslib.core.lifecycle.events.OnStop; 47 import com.android.settingslib.core.lifecycle.LifecycleObserver; 48 49 import java.net.InetAddress; 50 import java.util.List; 51 52 public class PrivateDnsPreferenceController extends BasePreferenceController 53 implements PreferenceControllerMixin, LifecycleObserver, OnStart, OnStop { 54 private static final String KEY_PRIVATE_DNS_SETTINGS = "private_dns_settings"; 55 56 private static final Uri[] SETTINGS_URIS = new Uri[]{ 57 Settings.Global.getUriFor(PRIVATE_DNS_MODE), 58 Settings.Global.getUriFor(PRIVATE_DNS_DEFAULT_MODE), 59 Settings.Global.getUriFor(PRIVATE_DNS_SPECIFIER), 60 }; 61 62 private final Handler mHandler; 63 private final ContentObserver mSettingsObserver; 64 private final ConnectivityManager mConnectivityManager; 65 private LinkProperties mLatestLinkProperties; 66 private Preference mPreference; 67 PrivateDnsPreferenceController(Context context)68 public PrivateDnsPreferenceController(Context context) { 69 super(context, KEY_PRIVATE_DNS_SETTINGS); 70 mHandler = new Handler(Looper.getMainLooper()); 71 mSettingsObserver = new PrivateDnsSettingsObserver(mHandler); 72 mConnectivityManager = context.getSystemService(ConnectivityManager.class); 73 } 74 75 @Override getPreferenceKey()76 public String getPreferenceKey() { 77 return KEY_PRIVATE_DNS_SETTINGS; 78 } 79 80 @Override getAvailabilityStatus()81 public int getAvailabilityStatus() { 82 return AVAILABLE; 83 } 84 85 @Override displayPreference(PreferenceScreen screen)86 public void displayPreference(PreferenceScreen screen) { 87 super.displayPreference(screen); 88 89 mPreference = screen.findPreference(getPreferenceKey()); 90 } 91 92 @Override onStart()93 public void onStart() { 94 for (Uri uri : SETTINGS_URIS) { 95 mContext.getContentResolver().registerContentObserver(uri, false, mSettingsObserver); 96 } 97 final Network defaultNetwork = mConnectivityManager.getActiveNetwork(); 98 if (defaultNetwork != null) { 99 mLatestLinkProperties = mConnectivityManager.getLinkProperties(defaultNetwork); 100 } 101 mConnectivityManager.registerDefaultNetworkCallback(mNetworkCallback, mHandler); 102 } 103 104 @Override onStop()105 public void onStop() { 106 mContext.getContentResolver().unregisterContentObserver(mSettingsObserver); 107 mConnectivityManager.unregisterNetworkCallback(mNetworkCallback); 108 } 109 110 @Override getSummary()111 public CharSequence getSummary() { 112 final Resources res = mContext.getResources(); 113 final ContentResolver cr = mContext.getContentResolver(); 114 final String mode = PrivateDnsModeDialogPreference.getModeFromSettings(cr); 115 final LinkProperties lp = mLatestLinkProperties; 116 final List<InetAddress> dnses = (lp == null) ? null : lp.getValidatedPrivateDnsServers(); 117 final boolean dnsesResolved = !ArrayUtils.isEmpty(dnses); 118 switch (mode) { 119 case PRIVATE_DNS_MODE_OFF: 120 return res.getString(R.string.private_dns_mode_off); 121 case PRIVATE_DNS_MODE_OPPORTUNISTIC: 122 // TODO (b/79122154) : create a string specifically for this, instead of 123 // hijacking a string from notifications. This is necessary at this time 124 // because string freeze is in the past and this string has the right 125 // content at this moment. 126 return dnsesResolved ? res.getString(R.string.switch_on_text) 127 : res.getString(R.string.private_dns_mode_opportunistic); 128 case PRIVATE_DNS_MODE_PROVIDER_HOSTNAME: 129 return dnsesResolved 130 ? PrivateDnsModeDialogPreference.getHostnameFromSettings(cr) 131 : res.getString(R.string.private_dns_mode_provider_failure); 132 } 133 return ""; 134 } 135 136 private class PrivateDnsSettingsObserver extends ContentObserver { PrivateDnsSettingsObserver(Handler h)137 public PrivateDnsSettingsObserver(Handler h) { 138 super(h); 139 } 140 141 @Override onChange(boolean selfChange)142 public void onChange(boolean selfChange) { 143 if (mPreference != null) { 144 updateState(mPreference); 145 } 146 } 147 } 148 149 private final NetworkCallback mNetworkCallback = new NetworkCallback() { 150 @Override 151 public void onLinkPropertiesChanged(Network network, LinkProperties lp) { 152 mLatestLinkProperties = lp; 153 if (mPreference != null) { 154 updateState(mPreference); 155 } 156 } 157 @Override 158 public void onLost(Network network) { 159 mLatestLinkProperties = null; 160 if (mPreference != null) { 161 updateState(mPreference); 162 } 163 } 164 }; 165 } 166