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/*
* Copyright (C) 2017 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.settings.network;
import static android.net.ConnectivityManager.PRIVATE_DNS_MODE_OFF;
import static android.net.ConnectivityManager.PRIVATE_DNS_MODE_OPPORTUNISTIC;
import static android.net.ConnectivityManager.PRIVATE_DNS_MODE_PROVIDER_HOSTNAME;
import static android.provider.Settings.Global.PRIVATE_DNS_DEFAULT_MODE;
import static android.provider.Settings.Global.PRIVATE_DNS_MODE;
import static android.provider.Settings.Global.PRIVATE_DNS_SPECIFIER;
import android.content.Context;
import android.content.ContentResolver;
import android.content.res.Resources;
import android.database.ContentObserver;
import android.net.ConnectivityManager;
import android.net.ConnectivityManager.NetworkCallback;
import android.net.LinkProperties;
import android.net.Network;
import android.net.Uri;
import android.os.Handler;
import android.os.Looper;
import android.provider.Settings;
import androidx.preference.Preference;
import androidx.preference.PreferenceScreen;
import com.android.internal.util.ArrayUtils;
import com.android.settings.R;
import com.android.settings.core.BasePreferenceController;
import com.android.settings.core.PreferenceControllerMixin;
import com.android.settingslib.core.lifecycle.events.OnStart;
import com.android.settingslib.core.lifecycle.events.OnStop;
import com.android.settingslib.core.lifecycle.LifecycleObserver;
import java.net.InetAddress;
import java.util.List;
public class PrivateDnsPreferenceController extends BasePreferenceController
implements PreferenceControllerMixin, LifecycleObserver, OnStart, OnStop {
private static final String KEY_PRIVATE_DNS_SETTINGS = "private_dns_settings";
private static final Uri[] SETTINGS_URIS = new Uri[]{
Settings.Global.getUriFor(PRIVATE_DNS_MODE),
Settings.Global.getUriFor(PRIVATE_DNS_DEFAULT_MODE),
Settings.Global.getUriFor(PRIVATE_DNS_SPECIFIER),
};
private final Handler mHandler;
private final ContentObserver mSettingsObserver;
private final ConnectivityManager mConnectivityManager;
private LinkProperties mLatestLinkProperties;
private Preference mPreference;
public PrivateDnsPreferenceController(Context context) {
super(context, KEY_PRIVATE_DNS_SETTINGS);
mHandler = new Handler(Looper.getMainLooper());
mSettingsObserver = new PrivateDnsSettingsObserver(mHandler);
mConnectivityManager = context.getSystemService(ConnectivityManager.class);
}
@Override
public String getPreferenceKey() {
return KEY_PRIVATE_DNS_SETTINGS;
}
@Override
public int getAvailabilityStatus() {
return AVAILABLE;
}
@Override
public void displayPreference(PreferenceScreen screen) {
super.displayPreference(screen);
mPreference = screen.findPreference(getPreferenceKey());
}
@Override
public void onStart() {
for (Uri uri : SETTINGS_URIS) {
mContext.getContentResolver().registerContentObserver(uri, false, mSettingsObserver);
}
final Network defaultNetwork = mConnectivityManager.getActiveNetwork();
if (defaultNetwork != null) {
mLatestLinkProperties = mConnectivityManager.getLinkProperties(defaultNetwork);
}
mConnectivityManager.registerDefaultNetworkCallback(mNetworkCallback, mHandler);
}
@Override
public void onStop() {
mContext.getContentResolver().unregisterContentObserver(mSettingsObserver);
mConnectivityManager.unregisterNetworkCallback(mNetworkCallback);
}
@Override
public CharSequence getSummary() {
final Resources res = mContext.getResources();
final ContentResolver cr = mContext.getContentResolver();
final String mode = PrivateDnsModeDialogPreference.getModeFromSettings(cr);
final LinkProperties lp = mLatestLinkProperties;
final List<InetAddress> dnses = (lp == null) ? null : lp.getValidatedPrivateDnsServers();
final boolean dnsesResolved = !ArrayUtils.isEmpty(dnses);
switch (mode) {
case PRIVATE_DNS_MODE_OFF:
return res.getString(R.string.private_dns_mode_off);
case PRIVATE_DNS_MODE_OPPORTUNISTIC:
return dnsesResolved ? res.getString(R.string.private_dns_mode_on)
: res.getString(R.string.private_dns_mode_opportunistic);
case PRIVATE_DNS_MODE_PROVIDER_HOSTNAME:
return dnsesResolved
? PrivateDnsModeDialogPreference.getHostnameFromSettings(cr)
: res.getString(R.string.private_dns_mode_provider_failure);
}
return "";
}
private class PrivateDnsSettingsObserver extends ContentObserver {
public PrivateDnsSettingsObserver(Handler h) {
super(h);
}
@Override
public void onChange(boolean selfChange) {
if (mPreference != null) {
updateState(mPreference);
}
}
}
private final NetworkCallback mNetworkCallback = new NetworkCallback() {
@Override
public void onLinkPropertiesChanged(Network network, LinkProperties lp) {
mLatestLinkProperties = lp;
if (mPreference != null) {
updateState(mPreference);
}
}
@Override
public void onLost(Network network) {
mLatestLinkProperties = null;
if (mPreference != null) {
updateState(mPreference);
}
}
};
}
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