Wifi MAC Randomization: Developer Options

Add a toggle in developers options to turn on/off connected MAC
randomization for devices that support the feature. This toggle will be
only available on devices that support dynamic MAC address change and
indicated as so in config_wifi_support_connected_mac_randomization.

The toggle changes Settings Global value WIFI_CONNECTED_MAC_RANDOMIZATION_ENABLED, which the Wifi Framework will listen for to start/stop randomizing MAC addresses.

Bug: 67908229
Bug: 71548421
Test: RunSettingsRoboTests, manual testing checking that the toggle comes up and changes global settings value.
Change-Id: Ia4749cd0a1e7466333bd8a93088d6340f6567e25

res/values/config.xml

@@ -44,6 +44,10 @@
     <!-- Whether to show Camera laser sensor switch in Developer Options -->
     <bool name="config_show_camera_laser_sensor">false</bool>
 
+    <!-- Whether to show Connected MAC Randomization in Developer Options
+         as not all devices can support dynamic MAC address change.  -->
+    <bool name="config_wifi_support_connected_mac_randomization">false</bool>
+
     <!-- Fully-qualified class name for the implementation of the FeatureFactory to be instantiated. -->
     <string name="config_featureFactory" translatable="false">com.android.settings.overlay.FeatureFactoryImpl</string>
 

res/xml/development_settings.xml

@@ -202,6 +202,11 @@
             android:title="@string/wifi_verbose_logging"
             android:summary="@string/wifi_verbose_logging_summary"/>
 
+        <SwitchPreference
+            android:key="wifi_connected_mac_randomization"
+            android:title="@string/wifi_connected_mac_randomization"
+            android:summary="@string/wifi_connected_mac_randomization_summary"/>
+
         <SwitchPreference
             android:key="mobile_data_always_on"
             android:title="@string/mobile_data_always_on"

src/com/android/settings/development/DevelopmentSettingsDashboardFragment.java

@@ -398,6 +398,7 @@ public class DevelopmentSettingsDashboardFragment extends RestrictedDashboardFra
         controllers.add(new CameraLaserSensorPreferenceController(context));
         controllers.add(new WifiDisplayCertificationPreferenceController(context));
         controllers.add(new WifiVerboseLoggingPreferenceController(context));
+        controllers.add(new WifiConnectedMacRandomizationPreferenceController(context));
         controllers.add(new MobileDataAlwaysOnPreferenceController(context));
         controllers.add(new TetheringHardwareAccelPreferenceController(context));
         controllers.add(new SelectUsbConfigPreferenceController(context, lifecycle));

src/com/android/settings/development/WifiConnectedMacRandomizationPreferenceController.java

@@ -0,0 +1,93 @@
+/*
+ * 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.development;
+
+import android.content.Context;
+import android.provider.Settings;
+import android.support.annotation.VisibleForTesting;
+import android.support.v14.preference.SwitchPreference;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.PreferenceScreen;
+
+import com.android.settings.R;
+import com.android.settings.core.PreferenceControllerMixin;
+import com.android.settingslib.development.DeveloperOptionsPreferenceController;
+
+public class WifiConnectedMacRandomizationPreferenceController extends
+        DeveloperOptionsPreferenceController implements Preference.OnPreferenceChangeListener,
+        PreferenceControllerMixin {
+
+    private static final String WIFI_CONNECTED_MAC_RANDOMIZATION_KEY =
+            "wifi_connected_mac_randomization";
+
+    @VisibleForTesting
+    static final int SETTING_VALUE_ON = 1;
+    @VisibleForTesting
+    static final int SETTING_VALUE_OFF = 0;
+
+    private SwitchPreference mPreference;
+
+    public WifiConnectedMacRandomizationPreferenceController(Context context) {
+        super(context);
+    }
+
+    @Override
+    public boolean isAvailable() {
+        return mContext.getResources().getBoolean(
+                R.bool.config_wifi_support_connected_mac_randomization);
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return WIFI_CONNECTED_MAC_RANDOMIZATION_KEY;
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        mPreference = (SwitchPreference) screen.findPreference(getPreferenceKey());
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object newValue) {
+        final boolean isEnabled = (Boolean) newValue;
+        Settings.Global.putInt(mContext.getContentResolver(),
+                Settings.Global.WIFI_CONNECTED_MAC_RANDOMIZATION_ENABLED,
+                isEnabled ? SETTING_VALUE_ON : SETTING_VALUE_OFF);
+        return true;
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        final int enableMode = Settings.Global.getInt(mContext.getContentResolver(),
+                Settings.Global.WIFI_CONNECTED_MAC_RANDOMIZATION_ENABLED, SETTING_VALUE_OFF);
+        mPreference.setChecked(enableMode != SETTING_VALUE_OFF);
+    }
+
+    @Override
+    protected void onDeveloperOptionsSwitchEnabled() {
+        mPreference.setEnabled(true);
+    }
+
+    @Override
+    protected void onDeveloperOptionsSwitchDisabled() {
+        Settings.Global.putInt(mContext.getContentResolver(),
+                Settings.Global.WIFI_CONNECTED_MAC_RANDOMIZATION_ENABLED, SETTING_VALUE_OFF);
+        mPreference.setChecked(false);
+        mPreference.setEnabled(false);
+    }
+}

tests/robotests/res/values-mcc999/config.xml

@@ -54,4 +54,5 @@
     <bool name="config_show_vibrate_input_devices">false</bool>
     <bool name="config_show_color_correction_preference">false</bool>
     <bool name="config_show_color_inversion_preference">false</bool>
+    <bool name="config_wifi_support_connected_mac_randomization">false</bool>
 </resources>

tests/robotests/res/values/config.xml

@@ -21,4 +21,5 @@
     <bool name="config_show_camera_laser_sensor">true</bool>
     <bool name="config_show_connectivity_monitor">true</bool>
     <bool name="config_display_recent_apps">true</bool>
+    <bool name="config_wifi_support_connected_mac_randomization">true</bool>
 </resources>

tests/robotests/src/com/android/settings/development/WifiConnectedMacRandomizationPreferenceControllerTest.java

@@ -0,0 +1,133 @@
+/*
+ * 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.development;
+
+import static com.android.settings.development.WifiConnectedMacRandomizationPreferenceController
+        .SETTING_VALUE_OFF;
+import static com.android.settings.development.WifiConnectedMacRandomizationPreferenceController
+        .SETTING_VALUE_ON;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.Mockito.when;
+
+import android.content.Context;
+import android.provider.Settings;
+import android.support.v14.preference.SwitchPreference;
+import android.support.v7.preference.PreferenceScreen;
+
+import com.android.settings.TestConfig;
+import com.android.settings.testutils.SettingsRobolectricTestRunner;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.annotation.Config;
+import org.robolectric.RuntimeEnvironment;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
+public class WifiConnectedMacRandomizationPreferenceControllerTest {
+
+    @Mock
+    private PreferenceScreen mPreferenceScreen;
+
+    private Context mContext;
+    private SwitchPreference mPreference;
+    private WifiConnectedMacRandomizationPreferenceController mController;
+
+    @Before
+    public void setup() {
+        MockitoAnnotations.initMocks(this);
+        mContext = RuntimeEnvironment.application;
+        mController = new WifiConnectedMacRandomizationPreferenceController(mContext);
+        mPreference = new SwitchPreference(mContext);
+        when(mPreferenceScreen.findPreference(mController.getPreferenceKey())).thenReturn(
+                mPreference);
+        mController.displayPreference(mPreferenceScreen);
+    }
+
+    @Test
+    public void isAvailable_trueSupportFlag_shouldReturnTrue() {
+        assertThat(mController.isAvailable()).isTrue();
+    }
+
+    @Test
+    @Config(qualifiers = "mcc999")
+    public void isAvailable_falseSupportFlag_shouldReturnFalse() {
+        assertThat(mController.isAvailable()).isFalse();
+    }
+
+    @Test
+    public void onPreferenceChange_settingEnabled_shouldEnableConnectedMacRandomization() {
+        mController.onPreferenceChange(mPreference, true /* new value */);
+
+        final int mode = Settings.Global.getInt(mContext.getContentResolver(),
+                Settings.Global.WIFI_CONNECTED_MAC_RANDOMIZATION_ENABLED, -1 /* default */);
+
+        assertThat(mode).isEqualTo(SETTING_VALUE_ON);
+    }
+
+    @Test
+    public void onPreferenceChange_settingDisabled_shouldDisableConnectedMacRandomization() {
+        mController.onPreferenceChange(mPreference, false /* new value */);
+
+        final int mode = Settings.Global.getInt(mContext.getContentResolver(),
+                Settings.Global.WIFI_CONNECTED_MAC_RANDOMIZATION_ENABLED, -1 /* default */);
+
+        assertThat(mode).isEqualTo(SETTING_VALUE_OFF);
+    }
+
+    @Test
+    public void updateState_settingEnabled_shouldEnablePreference() {
+        Settings.Global.putInt(mContext.getContentResolver(),
+                Settings.Global.WIFI_CONNECTED_MAC_RANDOMIZATION_ENABLED, SETTING_VALUE_ON);
+        mController.updateState(mPreference);
+
+        assertThat(mPreference.isChecked()).isTrue();
+    }
+
+    @Test
+    public void updateState_settingDisabled_shouldDisablePreference() {
+        Settings.Global.putInt(mContext.getContentResolver(),
+                Settings.Global.WIFI_CONNECTED_MAC_RANDOMIZATION_ENABLED, SETTING_VALUE_OFF);
+        mController.updateState(mPreference);
+
+        assertThat(mPreference.isChecked()).isFalse();
+    }
+
+    @Test
+    public void onDeveloperOptionsSwitchEnabled_shouldEnablePreference() {
+        mController.onDeveloperOptionsSwitchEnabled();
+
+        assertThat(mPreference.isEnabled()).isTrue();
+    }
+
+    @Test
+    public void onDeveloperOptionsSwitchDisabled_shouldDisablePreference() {
+        mController.onDeveloperOptionsSwitchDisabled();
+
+        final int mode = Settings.Global.getInt(mContext.getContentResolver(),
+                Settings.Global.WIFI_CONNECTED_MAC_RANDOMIZATION_ENABLED, -1 /* default */);
+
+        assertThat(mode).isEqualTo(SETTING_VALUE_OFF);
+        assertThat(mPreference.isChecked()).isFalse();
+        assertThat(mPreference.isEnabled()).isFalse();
+    }
+}