Version bump

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

.gitignore

@@ -13,3 +13,5 @@ build/
 *.class
 *.dex
 *.iml
+*.jks
+keystore.properties

.idea/inspectionProfiles/Default.xml

@@ -150,7 +150,6 @@
     <inspection_tool class="FieldMayBeFinal" enabled="true" level="WARNING" enabled_by_default="true" />
     <inspection_tool class="FieldMayBeStatic" enabled="true" level="WARNING" enabled_by_default="true" />
     <inspection_tool class="FieldMustBeInitialized" enabled="true" level="ERROR" enabled_by_default="true" />
-    <inspection_tool class="FieldNotUsedInToString" enabled="true" level="WARNING" enabled_by_default="true" />
     <inspection_tool class="FinalMethodInFinalClass" enabled="true" level="WARNING" enabled_by_default="true" />
     <inspection_tool class="FloatingPointEquality" enabled="true" level="WARNING" enabled_by_default="true" />
     <inspection_tool class="ForLoopReplaceableByWhile" enabled="true" level="WARNING" enabled_by_default="true">

app/build.gradle

@@ -1,27 +1,45 @@
 apply plugin: 'com.android.application'
 
+// Create a variable called keystorePropertiesFile, and initialize it to your
+// keystore.properties file, in the rootProject folder.
+final def keystorePropertiesFile = rootProject.file("keystore.properties")
+
 android {
-    buildToolsVersion '27.0.3'
-    buildTypes {
-        release {
-            minifyEnabled true
-            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
-        }
-    }
+    buildToolsVersion '28.0.0'
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
         targetCompatibility JavaVersion.VERSION_1_8
     }
     compileSdkVersion 27
-    dataBinding {
-        enabled true
-    }
+    dataBinding.enabled true
     defaultConfig {
         applicationId 'com.wireguard.android'
         minSdkVersion 21
         targetSdkVersion 27
-        versionCode 416
-        versionName '0.0.20180524'
+        versionCode 427
+        versionName '0.0.20180625'
+    }
+    // If the keystore file exists
+    if (keystorePropertiesFile.exists()) {
+        // Initialize a new Properties() object called keystoreProperties.
+        final def keystoreProperties = new Properties()
+
+        // Load your keystore.properties file into the keystoreProperties object.
+        keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
+
+        signingConfigs {
+            release {
+                keyAlias keystoreProperties['keyAlias']
+                keyPassword keystoreProperties['keyPassword']
+                storeFile file(keystoreProperties['storeFile'])
+                storePassword keystoreProperties['storePassword']
+            }
+        }
+    }
+    buildTypes {
+        release {
+            if (keystorePropertiesFile.exists()) signingConfig signingConfigs.release
+        }
     }
     externalNativeBuild {
         cmake {
@@ -29,24 +47,25 @@ android {
         }
     }
 }
+
 ext {
-    databindingVersion = '3.1.2'
+    databindingVersion = '3.1.3'
     supportLibsVersion = '27.1.1'
-    daggerVersion = '2.14.1'
-    fabLibVersion = '1.10.1'
     streamsupportVersion = '1.6.0'
 }
 
 dependencies {
-    annotationProcessor "com.google.dagger:dagger-compiler:$daggerVersion"
     implementation "com.android.databinding:library:$databindingVersion"
     implementation "com.android.support:appcompat-v7:$supportLibsVersion"
     implementation "com.android.support:cardview-v7:$supportLibsVersion"
     implementation "com.android.support:design:$supportLibsVersion"
     implementation "com.android.support:preference-v14:$supportLibsVersion"
     implementation "com.android.support:support-annotations:$supportLibsVersion"
-    implementation "com.getbase:floatingactionbutton:$fabLibVersion"
-    implementation "com.google.dagger:dagger:$daggerVersion"
     implementation "net.sourceforge.streamsupport:android-retrofuture:$streamsupportVersion"
     implementation "net.sourceforge.streamsupport:android-retrostreams:$streamsupportVersion"
 }
+
+tasks.withType(JavaCompile) {
+    options.compilerArgs << '-Xlint:unchecked'
+    options.deprecation = true
+}

app/proguard-rules.pro

@@ -1,26 +0,0 @@
-# Add project specific ProGuard rules here.
-# By default, the flags in this file are appended to flags specified
-# in /opt/android-sdk/tools/proguard/proguard-android.txt
-# You can edit the include path and order by changing the proguardFiles
-# directive in build.gradle.
-#
-# For more details, see
-#   http://developer.android.com/guide/developing/tools/proguard.html
-
-# Add any project specific keep options here:
-
-# If your project uses WebView with JS, uncomment the following
-# and specify the fully qualified class name to the JavaScript interface
-# class:
-#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
-#   public *;
-#}
-
-# Uncomment this to preserve the line number information for
-# debugging stack traces.
-#-keepattributes SourceFile,LineNumberTable
-
-# If you keep the line number information, uncomment this to
-# hide the original source file name.
-#-renamesourcefileattribute SourceFile
--dontwarn sun.misc.Unsafe

app/src/main/AndroidManifest.xml

@@ -8,6 +8,13 @@
     <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
 
+    <permission
+        android:name="com.wireguard.android.permission.CONTROL_TUNNELS"
+        android:protectionLevel="dangerous"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/permission_label"
+        android:description="@string/permission_description" />
+
     <application
         android:name=".Application"
         android:allowBackup="false"
@@ -50,9 +57,13 @@
             </intent-filter>
         </receiver>
 
-        <receiver android:name=".backend.WgQuickBackend$WgQuickChangeReceiver">
+        <receiver
+            android:name=".model.TunnelManager$IntentReceiver"
+            android:permission="com.wireguard.android.permission.CONTROL_TUNNELS">
             <intent-filter>
-                <action android:name="com.wireguard.android.WGQUICK_CHANGE" />
+                <action android:name="com.wireguard.android.action.REFRESH_TUNNEL_STATES" />
+                <action android:name="com.wireguard.android.action.SET_TUNNEL_UP" />
+                <action android:name="com.wireguard.android.action.SET_TUNNEL_DOWN" />
             </intent-filter>
         </receiver>
 
@@ -62,9 +73,6 @@
             <intent-filter>
                 <action android:name="android.net.VpnService" />
             </intent-filter>
-            <meta-data
-                android:name="android.net.VpnService.SUPPORTS_ALWAYS_ON"
-                android:value="false" />
         </service>
 
         <service

app/src/main/java/com/wireguard/android/Application.java

@@ -1,17 +1,16 @@
 /*
- * Copyright © 2018 Samuel Holland <samuel@sholland.org>
  * Copyright © 2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
  * SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 package com.wireguard.android;
 
-import android.content.Context;
 import android.content.SharedPreferences;
 import android.os.AsyncTask;
 import android.os.Handler;
 import android.os.Looper;
 import android.preference.PreferenceManager;
+import android.support.v7.app.AppCompatDelegate;
 
 import com.wireguard.android.backend.Backend;
 import com.wireguard.android.backend.GoBackend;
@@ -24,118 +23,107 @@ import com.wireguard.android.util.RootShell;
 import com.wireguard.android.util.ToolsInstaller;
 
 import java.io.File;
+import java.lang.ref.WeakReference;
+import java.util.ArrayList;
+import java.util.List;
 import java.util.concurrent.Executor;
 
-import javax.inject.Qualifier;
-import javax.inject.Scope;
-
-import dagger.Component;
-import dagger.Module;
-import dagger.Provides;
-
-/**
- * Base context for the WireGuard Android application. This class (instantiated once during the
- * application lifecycle) maintains and mediates access to the global state of the application.
- */
-
 public class Application extends android.app.Application {
-    private static ApplicationComponent component;
+    private static WeakReference<Application> weakSelf;
+    private AsyncWorker asyncWorker;
+    private Backend backend;
+    private RootShell rootShell;
+    private SharedPreferences sharedPreferences;
+    private ToolsInstaller toolsInstaller;
+    private TunnelManager tunnelManager;
+    private Handler handler;
+    private List<BackendCallback> haveBackendCallbacks = new ArrayList<>();
+    private final Object haveBackendCallbacksLock = new Object();
 
-    public static ApplicationComponent getComponent() {
-        if (component == null)
-            throw new IllegalStateException("Application instance not yet created");
-        return component;
+    public Application() {
+        weakSelf = new WeakReference<>(this);
+    }
+
+    public static Application get() {
+        return weakSelf.get();
+    }
+
+    public static AsyncWorker getAsyncWorker() {
+        return get().asyncWorker;
+    }
+
+    public static Backend getBackend() {
+        final Application app = get();
+        synchronized (app) {
+            if (app.backend == null) {
+                if (new File("/sys/module/wireguard").exists()) {
+                    try {
+                        app.rootShell.start();
+                        app.backend = new WgQuickBackend(app.getApplicationContext());
+                    } catch (final Exception ignored) { }
+                }
+                if (app.backend == null)
+                    app.backend = new GoBackend(app.getApplicationContext());
+                synchronized (app.haveBackendCallbacksLock) {
+                    for (final BackendCallback callback : app.haveBackendCallbacks)
+                        app.handler.post(() -> callback.callback(app.backend));
+                    app.haveBackendCallbacks = null;
+                }
+            }
+            return app.backend;
+        }
+    }
+
+    @FunctionalInterface
+    public interface BackendCallback {
+        void callback(final Backend backend);
+    }
+
+    public static void onHaveBackend(final BackendCallback callback) {
+        final Application app = get();
+        synchronized (app.haveBackendCallbacksLock) {
+            if (app.haveBackendCallbacks == null)
+                callback.callback(app.backend);
+            else
+                app.haveBackendCallbacks.add(callback);
+        }
+    }
+
+    public static RootShell getRootShell() {
+        return get().rootShell;
+    }
+
+    public static SharedPreferences getSharedPreferences() {
+        return get().sharedPreferences;
+    }
+
+    public static ToolsInstaller getToolsInstaller() {
+        return get().toolsInstaller;
+    }
+
+    public static TunnelManager getTunnelManager() {
+        return get().tunnelManager;
     }
 
     @Override
     public void onCreate() {
         super.onCreate();
-        component = DaggerApplication_ApplicationComponent.builder()
-                .applicationModule(new ApplicationModule(this))
-                .build();
-        component.getTunnelManager().onCreate();
-    }
 
-    @ApplicationScope
-    @Component(modules = ApplicationModule.class)
-    public interface ApplicationComponent {
-        AsyncWorker getAsyncWorker();
+        handler = new Handler(Looper.getMainLooper());
+        final Executor executor = AsyncTask.SERIAL_EXECUTOR;
+        final ConfigStore configStore = new FileConfigStore(getApplicationContext());
 
-        Class getBackendType();
+        asyncWorker = new AsyncWorker(executor, handler);
+        rootShell = new RootShell(getApplicationContext());
+        toolsInstaller = new ToolsInstaller(getApplicationContext());
 
-        ToolsInstaller getToolsInstaller();
+        sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
+        AppCompatDelegate.setDefaultNightMode(
+                sharedPreferences.getBoolean("dark_theme", false) ?
+                        AppCompatDelegate.MODE_NIGHT_YES : AppCompatDelegate.MODE_NIGHT_NO);
 
-        TunnelManager getTunnelManager();
-    }
-
-    @Qualifier
-    public @interface ApplicationContext {
-    }
-
-    @Qualifier
-    public @interface ApplicationHandler {
-    }
-
-    @Scope
-    public @interface ApplicationScope {
-    }
-
-    @Module
-    public static final class ApplicationModule {
-        private final Context context;
-
-        private ApplicationModule(final Application application) {
-            context = application.getApplicationContext();
-        }
-
-        @ApplicationScope
-        @Provides
-        public static Backend getBackend(@ApplicationContext final Context context,
-                                         final RootShell rootShell,
-                                         final ToolsInstaller toolsInstaller) {
-            if (new File("/sys/module/wireguard").exists())
-                return new WgQuickBackend(context, rootShell, toolsInstaller);
-            else
-                return new GoBackend(context);
-        }
-
-        @ApplicationScope
-        @Provides
-        public static Class getBackendType(final Backend backend) {
-            return backend.getClass();
-        }
-
-        @ApplicationScope
-        @Provides
-        public static ConfigStore getConfigStore(@ApplicationContext final Context context) {
-            return new FileConfigStore(context);
-        }
-
-
-        @ApplicationScope
-        @Provides
-        public static Executor getExecutor() {
-            return AsyncTask.SERIAL_EXECUTOR;
-        }
-
-        @ApplicationHandler
-        @ApplicationScope
-        @Provides
-        public static Handler getHandler() {
-            return new Handler(Looper.getMainLooper());
-        }
-
-        @ApplicationScope
-        @Provides
-        public static SharedPreferences getPreferences(@ApplicationContext final Context context) {
-            return PreferenceManager.getDefaultSharedPreferences(context);
-        }
-
-        @ApplicationContext
-        @ApplicationScope
-        @Provides
-        public Context getContext() {
-            return context;
-        }
+        tunnelManager = new TunnelManager(configStore);
+        asyncWorker.runAsync(Application::getBackend);
+        tunnelManager.onCreate();
     }
 }

app/src/main/java/com/wireguard/android/BootShutdownReceiver.java

@@ -11,6 +11,7 @@ import android.content.Context;
 import android.content.Intent;
 import android.util.Log;
 
+import com.wireguard.android.backend.WgQuickBackend;
 import com.wireguard.android.model.TunnelManager;
 import com.wireguard.android.util.ExceptionLoggers;
 
@@ -19,16 +20,20 @@ public class BootShutdownReceiver extends BroadcastReceiver {
 
     @Override
     public void onReceive(final Context context, final Intent intent) {
-        final String action = intent.getAction();
-        if (action == null)
-            return;
-        final TunnelManager tunnelManager = Application.getComponent().getTunnelManager();
-        if (Intent.ACTION_BOOT_COMPLETED.equals(action)) {
-            Log.i(TAG, "Broadcast receiver restoring state (boot)");
-            tunnelManager.restoreState().whenComplete(ExceptionLoggers.D);
-        } else if (Intent.ACTION_SHUTDOWN.equals(action)) {
-            Log.i(TAG, "Broadcast receiver saving state (shutdown)");
-            tunnelManager.saveState();
-        }
+        Application.onHaveBackend(backend -> {
+            if (backend.getClass() != WgQuickBackend.class)
+                return;
+            final String action = intent.getAction();
+            if (action == null)
+                return;
+            final TunnelManager tunnelManager = Application.getTunnelManager();
+            if (Intent.ACTION_BOOT_COMPLETED.equals(action)) {
+                Log.i(TAG, "Broadcast receiver restoring state (boot)");
+                tunnelManager.restoreState(false).whenComplete(ExceptionLoggers.D);
+            } else if (Intent.ACTION_SHUTDOWN.equals(action)) {
+                Log.i(TAG, "Broadcast receiver saving state (shutdown)");
+                tunnelManager.saveState();
+            }
+        });
     }
 }

app/src/main/java/com/wireguard/android/QuickTileService.java

@@ -20,7 +20,6 @@ import android.widget.Toast;
 import com.wireguard.android.activity.MainActivity;
 import com.wireguard.android.model.Tunnel;
 import com.wireguard.android.model.Tunnel.State;
-import com.wireguard.android.model.TunnelManager;
 import com.wireguard.android.util.ExceptionLoggers;
 
 import java.util.Objects;
@@ -38,7 +37,6 @@ public class QuickTileService extends TileService {
     private final OnStateChangedCallback onStateChangedCallback = new OnStateChangedCallback();
     private final OnTunnelChangedCallback onTunnelChangedCallback = new OnTunnelChangedCallback();
     private Tunnel tunnel;
-    private TunnelManager tunnelManager;
 
     @Override
     public void onClick() {
@@ -51,15 +49,9 @@ public class QuickTileService extends TileService {
         }
     }
 
-    @Override
-    public void onCreate() {
-        super.onCreate();
-        tunnelManager = Application.getComponent().getTunnelManager();
-    }
-
     @Override
     public void onStartListening() {
-        tunnelManager.addOnPropertyChangedCallback(onTunnelChangedCallback);
+        Application.getTunnelManager().addOnPropertyChangedCallback(onTunnelChangedCallback);
         if (tunnel != null)
             tunnel.addOnPropertyChangedCallback(onStateChangedCallback);
         updateTile();
@@ -69,7 +61,7 @@ public class QuickTileService extends TileService {
     public void onStopListening() {
         if (tunnel != null)
             tunnel.removeOnPropertyChangedCallback(onStateChangedCallback);
-        tunnelManager.removeOnPropertyChangedCallback(onTunnelChangedCallback);
+        Application.getTunnelManager().removeOnPropertyChangedCallback(onTunnelChangedCallback);
     }
 
     private void onToggleFinished(@SuppressWarnings("unused") final State state,
@@ -84,7 +76,7 @@ public class QuickTileService extends TileService {
 
     private void updateTile() {
         // Update the tunnel.
-        final Tunnel newTunnel = tunnelManager.getLastUsedTunnel();
+        final Tunnel newTunnel = Application.getTunnelManager().getLastUsedTunnel();
         if (newTunnel != tunnel) {
             if (tunnel != null)
                 tunnel.removeOnPropertyChangedCallback(onStateChangedCallback);

app/src/main/java/com/wireguard/android/activity/BaseActivity.java

@@ -10,7 +10,6 @@ import android.content.Intent;
 import android.databinding.CallbackRegistry;
 import android.databinding.CallbackRegistry.NotifierCallback;
 import android.os.Bundle;
-import android.support.v7.app.AppCompatActivity;
 
 import com.wireguard.android.Application;
 import com.wireguard.android.backend.GoBackend;
@@ -23,7 +22,7 @@ import java.util.Objects;
  * Base class for activities that need to remember the currently-selected tunnel.
  */
 
-public abstract class BaseActivity extends AppCompatActivity {
+public abstract class BaseActivity extends ThemeChangeAwareActivity {
     private static final String KEY_SELECTED_TUNNEL = "selected_tunnel";
 
     private final SelectionChangeRegistry selectionChangeRegistry = new SelectionChangeRegistry();
@@ -47,19 +46,20 @@ public abstract class BaseActivity extends AppCompatActivity {
         else if (getIntent() != null)
             savedTunnelName = getIntent().getStringExtra(KEY_SELECTED_TUNNEL);
         if (savedTunnelName != null) {
-            final TunnelManager tunnelManager = Application.getComponent().getTunnelManager();
+            final TunnelManager tunnelManager = Application.getTunnelManager();
             selectedTunnel = tunnelManager.getTunnels().get(savedTunnelName);
         }
 
         // The selected tunnel must be set before the superclass method recreates fragments.
         super.onCreate(savedInstanceState);
 
-        if (Application.getComponent().getBackendType() == GoBackend.class) {
-            final Intent intent = GoBackend.VpnService.prepare(this);
-            if (intent != null) {
-                startActivityForResult(intent, 0);
+        Application.onHaveBackend(backend -> {
+            if (backend.getClass() == GoBackend.class) {
+                final Intent intent = GoBackend.VpnService.prepare(this);
+                if (intent != null)
+                    startActivityForResult(intent, 0);
             }
-        }
+        });
     }
 
     @Override

app/src/main/java/com/wireguard/android/activity/MainActivity.java

@@ -6,6 +6,7 @@
 
 package com.wireguard.android.activity;
 
+import android.annotation.SuppressLint;
 import android.content.Intent;
 import android.os.Bundle;
 import android.support.v4.app.Fragment;
@@ -71,17 +72,17 @@ public class MainActivity extends BaseActivity {
     public void onBackPressed() {
         TunnelListFragment fragment = null;
         try {
-            fragment =
-                    ((TunnelListFragment)
-                            getSupportFragmentManager().getFragments().get(0));
-        } catch (final ClassCastException ignored) {
-        }
-        if (fragment == null || !(fragment.collapseActionMenu())) {
+            fragment = ((TunnelListFragment) getSupportFragmentManager().getFragments().get(0));
+        } catch (final ClassCastException ignored) { }
+        if (fragment == null || !fragment.collapseActionMenu()) {
             if (!moveToState(State.ofLayer(state.layer - 1)))
                 super.onBackPressed();
         }
     }
 
+    // We use onTouchListener here to avoid the UI click sound, hence
+    // calling View#performClick defeats the purpose of it.
+    @SuppressLint("ClickableViewAccessibility")
     @Override
     protected void onCreate(final Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -95,6 +96,15 @@ public class MainActivity extends BaseActivity {
             moveToState(initialState);
         }
         updateActionBar();
+        final int actionBarId = getResources().getIdentifier("action_bar", "id", getPackageName());
+        if (actionBarId != 0 && findViewById(actionBarId) != null) {
+            findViewById(actionBarId).setOnTouchListener((v, e) -> {
+                try {
+                    ((TunnelListFragment) getSupportFragmentManager().getFragments().get(0)).collapseActionMenu();
+                } catch (final ClassCastException ignored) { }
+                return false;
+            });
+        }
     }
 
     @Override
@@ -131,7 +141,6 @@ public class MainActivity extends BaseActivity {
         super.onSaveInstanceState(outState);
     }
 
-
     @Override
     protected void onSelectedTunnelChanged(final Tunnel oldTunnel, final Tunnel newTunnel) {
         moveToState(newTunnel != null ? State.DETAIL : State.LIST);

app/src/main/java/com/wireguard/android/activity/SettingsActivity.java

@@ -11,9 +11,9 @@ import android.os.Bundle;
 import android.support.annotation.NonNull;
 import android.support.v4.app.ActivityCompat;
 import android.support.v4.content.ContextCompat;
-import android.support.v7.app.AppCompatActivity;
 import android.support.v7.preference.Preference;
 import android.support.v7.preference.PreferenceFragmentCompat;
+import android.support.v7.preference.PreferenceScreen;
 import android.view.MenuItem;
 
 import com.wireguard.android.Application;
@@ -30,7 +30,7 @@ import java.util.Map;
  * Interface for changing application-global persistent settings.
  */
 
-public class SettingsActivity extends AppCompatActivity {
+public class SettingsActivity extends ThemeChangeAwareActivity {
     private final Map<Integer, PermissionRequestCallback> permissionRequestCallbacks = new HashMap<>();
     private int permissionRequestCounter;
 
@@ -93,11 +93,21 @@ public class SettingsActivity extends AppCompatActivity {
         @Override
         public void onCreatePreferences(final Bundle savedInstanceState, final String key) {
             addPreferencesFromResource(R.xml.preferences);
-            if (Application.getComponent().getBackendType() != WgQuickBackend.class) {
-                final Preference toolsInstaller =
-                        getPreferenceManager().findPreference("tools_installer");
-                getPreferenceScreen().removePreference(toolsInstaller);
-            }
+            final Preference wgQuickOnlyPrefs[] = {
+                getPreferenceManager().findPreference("tools_installer"),
+                getPreferenceManager().findPreference("restore_on_boot")
+            };
+            for (final Preference pref : wgQuickOnlyPrefs)
+                pref.setVisible(false);
+            final PreferenceScreen screen = getPreferenceScreen();
+            Application.onHaveBackend(backend -> {
+                for (final Preference pref : wgQuickOnlyPrefs) {
+                    if (backend.getClass() == WgQuickBackend.class)
+                        pref.setVisible(true);
+                    else
+                        screen.removePreference(pref);
+                }
+            });
         }
     }
 }

app/src/main/java/com/wireguard/android/activity/ThemeChangeAwareActivity.java

@@ -0,0 +1,77 @@
+/*
+ * Copyright © 2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+package com.wireguard.android.activity;
+
+import android.content.SharedPreferences;
+import android.content.res.Resources;
+import android.os.Bundle;
+import android.support.v7.app.AppCompatActivity;
+import android.support.v7.app.AppCompatDelegate;
+import android.util.Log;
+
+import com.wireguard.android.Application;
+
+import java.lang.reflect.Field;
+
+public abstract class ThemeChangeAwareActivity extends AppCompatActivity implements SharedPreferences.OnSharedPreferenceChangeListener {
+    private static final String TAG = "WireGuard/" + ThemeChangeAwareActivity.class.getSimpleName();
+
+    private static Resources lastResources;
+    private static boolean lastDarkMode;
+    private static synchronized void invalidateDrawableCache(final Resources resources, final boolean darkMode) {
+        if (resources == lastResources && darkMode == lastDarkMode)
+            return;
+
+        try {
+            Field f;
+            Object o = resources;
+            try {
+                f = o.getClass().getDeclaredField("mResourcesImpl");
+                f.setAccessible(true);
+                o = f.get(o);
+            } catch (final Exception ignored) { }
+            f = o.getClass().getDeclaredField("mDrawableCache");
+            f.setAccessible(true);
+            o = f.get(o);
+            try {
+                o.getClass().getMethod("onConfigurationChange", int.class).invoke(o, -1);
+            } catch (final Exception ignored) {
+                o.getClass().getMethod("clear").invoke(o);
+            }
+        } catch (final Exception e) {
+            Log.e(TAG, "Failed to flush drawable cache", e);
+        }
+
+        lastResources = resources;
+        lastDarkMode = darkMode;
+    }
+
+
+    @Override
+    protected void onCreate(final Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        Application.getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
+    }
+
+    @Override
+    protected void onDestroy() {
+        Application.getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
+        super.onDestroy();
+    }
+
+    @Override
+    public void onSharedPreferenceChanged(final SharedPreferences sharedPreferences, final String key) {
+        if ("dark_theme".equals(key)) {
+            final boolean darkMode = sharedPreferences.getBoolean(key, false);
+            AppCompatDelegate.setDefaultNightMode(
+                    sharedPreferences.getBoolean(key, false) ?
+                            AppCompatDelegate.MODE_NIGHT_YES :
+                            AppCompatDelegate.MODE_NIGHT_NO);
+            invalidateDrawableCache(getResources(), darkMode);
+            recreate();
+        }
+    }
+}

app/src/main/java/com/wireguard/android/backend/Backend.java

@@ -62,4 +62,19 @@ public interface Backend {
      * @return The updated state of the tunnel.
      */
     State setState(Tunnel tunnel, State state) throws Exception;
+
+    /**
+     * Determine version of underlying backend.
+     *
+     * @return The version of the backend.
+     * @throws Exception
+     */
+    String getVersion() throws Exception;
+
+    /**
+     * Determine type name of underlying backend.
+     *
+     * @return Type name
+     */
+    String getTypeName();
 }

app/src/main/java/com/wireguard/android/backend/GoBackend.java

@@ -6,6 +6,7 @@
 
 package com.wireguard.android.backend;
 
+import android.app.PendingIntent;
 import android.content.Context;
 import android.content.Intent;
 import android.os.ParcelFileDescriptor;
@@ -13,11 +14,14 @@ import android.support.v4.util.ArraySet;
 import android.util.Log;
 
 import com.wireguard.android.Application;
+import com.wireguard.android.activity.MainActivity;
 import com.wireguard.android.model.Tunnel;
 import com.wireguard.android.model.Tunnel.State;
 import com.wireguard.android.model.Tunnel.Statistics;
+import com.wireguard.android.util.ExceptionLoggers;
+import com.wireguard.android.util.SharedLibraryLoader;
 import com.wireguard.config.Config;
-import com.wireguard.config.IPCidr;
+import com.wireguard.config.InetNetwork;
 import com.wireguard.config.Interface;
 import com.wireguard.config.Peer;
 import com.wireguard.crypto.KeyEncoding;
@@ -35,15 +39,12 @@ public final class GoBackend implements Backend {
     private static final String TAG = "WireGuard/" + GoBackend.class.getSimpleName();
     private static CompletableFuture<VpnService> vpnService = new CompletableFuture<>();
 
-    static {
-        System.loadLibrary("wg-go");
-    }
-
     private final Context context;
     private Tunnel currentTunnel;
     private int currentTunnelHandle = -1;
 
     public GoBackend(final Context context) {
+        SharedLibraryLoader.loadSharedLibrary(context, "wg-go");
         this.context = context;
     }
 
@@ -51,14 +52,18 @@ public final class GoBackend implements Backend {
 
     private static native int wgGetSocketV6(int handle);
 
-    private static native void wgPutSocketV4(int handle);
-
-    private static native void wgPutSocketV6(int handle);
-
     private static native void wgTurnOff(int handle);
 
     private static native int wgTurnOn(String ifName, int tunFd, String settings);
 
+    private static native String wgVersion();
+
+    @Override
+    public String getVersion() { return wgVersion(); }
+
+    @Override
+    public String getTypeName() { return "Go userspace"; }
+
     @Override
     public Config applyConfig(final Tunnel tunnel, final Config config) throws Exception {
         if (tunnel.getState() == State.UP) {
@@ -136,7 +141,7 @@ public final class GoBackend implements Backend {
             // Build config
             final Interface iface = config.getInterface();
             final String goConfig;
-            try (Formatter fmt = new Formatter(new StringBuilder())) {
+            try (final Formatter fmt = new Formatter(new StringBuilder())) {
                 fmt.format("replace_peers=true\n");
                 if (iface.getPrivateKey() != null)
                     fmt.format("private_key=%s\n", KeyEncoding.keyToHex(KeyEncoding.keyFromBase64(iface.getPrivateKey())));
@@ -151,7 +156,7 @@ public final class GoBackend implements Backend {
                         fmt.format("endpoint=%s\n", peer.getResolvedEndpointString());
                     if (peer.getPersistentKeepalive() != 0)
                         fmt.format("persistent_keepalive_interval=%d\n", peer.getPersistentKeepalive());
-                    for (final IPCidr addr : peer.getAllowedIPs()) {
+                    for (final InetNetwork addr : peer.getAllowedIPs()) {
                         fmt.format("allowed_ip=%s\n", addr.toString());
                     }
                 }
@@ -162,15 +167,19 @@ public final class GoBackend implements Backend {
             final VpnService.Builder builder = service.getBuilder();
             builder.setSession(tunnel.getName());
 
-            for (final IPCidr addr : config.getInterface().getAddresses())
-                builder.addAddress(addr.getAddress(), addr.getCidr());
+            final Intent configureIntent = new Intent(context, MainActivity.class);
+            configureIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+            builder.setConfigureIntent(PendingIntent.getActivity(context, 0, configureIntent, 0));
+
+            for (final InetNetwork addr : config.getInterface().getAddresses())
+                builder.addAddress(addr.getAddress(), addr.getMask());
 
             for (final InetAddress addr : config.getInterface().getDnses())
                 builder.addDnsServer(addr.getHostAddress());
 
             for (final Peer peer : config.getPeers()) {
-                for (final IPCidr addr : peer.getAllowedIPs())
-                    builder.addRoute(addr.getAddress(), addr.getCidr());
+                for (final InetNetwork addr : peer.getAllowedIPs())
+                    builder.addRoute(addr.getAddress(), addr.getMask());
             }
 
             int mtu = config.getInterface().getMtu();
@@ -179,20 +188,19 @@ public final class GoBackend implements Backend {
             builder.setMtu(mtu);
 
             builder.setBlocking(true);
-            final ParcelFileDescriptor tun = builder.establish();
-            if (tun == null)
-                throw new Exception("Unable to create tun device");
-
-            currentTunnelHandle = wgTurnOn(tunnel.getName(), tun.detachFd(), goConfig);
+            try (final ParcelFileDescriptor tun = builder.establish()) {
+                if (tun == null)
+                    throw new Exception("Unable to create tun device");
+                Log.d(TAG, "Go backend v" + wgVersion());
+                currentTunnelHandle = wgTurnOn(tunnel.getName(), tun.detachFd(), goConfig);
+            }
             if (currentTunnelHandle < 0)
                 throw new Exception("Unable to turn tunnel on (wgTurnOn return " + currentTunnelHandle + ')');
 
             currentTunnel = tunnel;
 
             service.protect(wgGetSocketV4(currentTunnelHandle));
-            wgPutSocketV4(currentTunnelHandle);
             service.protect(wgGetSocketV6(currentTunnelHandle));
-            wgPutSocketV6(currentTunnelHandle);
         } else {
             Log.i(TAG, "Bringing tunnel down");
 
@@ -208,6 +216,7 @@ public final class GoBackend implements Backend {
     }
 
     private void startVpnService() {
+        Log.d(TAG, "Requesting to start VpnService");
         context.startService(new Intent(context, VpnService.class));
     }
 
@@ -224,12 +233,22 @@ public final class GoBackend implements Backend {
 
         @Override
         public void onDestroy() {
-            for (final Tunnel tunnel : Application.getComponent().getTunnelManager().getTunnels()) {
+            for (final Tunnel tunnel : Application.getTunnelManager().getTunnels()) {
                 if (tunnel != null && tunnel.getState() != State.DOWN)
                     tunnel.setState(State.DOWN);
             }
             vpnService = vpnService.newIncompleteFuture();
             super.onDestroy();
         }
+
+        @Override
+        public int onStartCommand(final Intent intent, final int flags, final int startId) {
+            vpnService.complete(this);
+            if (intent == null || intent.getComponent() == null || !intent.getComponent().getPackageName().equals(getPackageName())) {
+                Log.d(TAG, "Service started by Always-on VPN feature");
+                Application.getTunnelManager().restoreState(true).whenComplete(ExceptionLoggers.D);
+            }
+            return super.onStartCommand(intent, flags, startId);
+        }
     }
 }

app/src/main/java/com/wireguard/android/backend/WgQuickBackend.java

@@ -6,17 +6,13 @@
 
 package com.wireguard.android.backend;
 
-import android.content.BroadcastReceiver;
 import android.content.Context;
-import android.content.Intent;
 import android.util.Log;
 
 import com.wireguard.android.Application;
 import com.wireguard.android.model.Tunnel;
 import com.wireguard.android.model.Tunnel.State;
 import com.wireguard.android.model.Tunnel.Statistics;
-import com.wireguard.android.util.RootShell;
-import com.wireguard.android.util.ToolsInstaller;
 import com.wireguard.config.Config;
 
 import java.io.File;
@@ -38,16 +34,23 @@ public final class WgQuickBackend implements Backend {
     private static final String TAG = "WireGuard/" + WgQuickBackend.class.getSimpleName();
 
     private final File localTemporaryDir;
-    private final RootShell rootShell;
-    private final ToolsInstaller toolsInstaller;
 
-    public WgQuickBackend(final Context context, final RootShell rootShell,
-                          final ToolsInstaller toolsInstaller) {
+    public WgQuickBackend(final Context context) {
         localTemporaryDir = new File(context.getCacheDir(), "tmp");
-        this.rootShell = rootShell;
-        this.toolsInstaller = toolsInstaller;
     }
 
+    @Override
+    public String getVersion() throws Exception {
+        final List<String> output = new ArrayList<>();
+        if (Application.getRootShell()
+                .run(output, "cat /sys/module/wireguard/version") != 0 || output.isEmpty())
+            throw new Exception("Unable to determine kernel module version");
+        return output.get(0);
+    }
+
+    @Override
+    public String getTypeName() { return "Kernel module"; }
+
     @Override
     public Config applyConfig(final Tunnel tunnel, final Config config) throws Exception {
         if (tunnel.getState() == State.UP) {
@@ -69,8 +72,8 @@ public final class WgQuickBackend implements Backend {
         final List<String> output = new ArrayList<>();
         // Don't throw an exception here or nothing will show up in the UI.
         try {
-            toolsInstaller.ensureToolsAvailable();
-            if (rootShell.run(output, "wg show interfaces") != 0 || output.isEmpty())
+            Application.getToolsInstaller().ensureToolsAvailable();
+            if (Application.getRootShell().run(output, "wg show interfaces") != 0 || output.isEmpty())
                 return Collections.emptySet();
         } catch (final Exception e) {
             Log.w(TAG, "Unable to enumerate running tunnels", e);
@@ -98,7 +101,7 @@ public final class WgQuickBackend implements Backend {
         if (state == originalState)
             return originalState;
         Log.d(TAG, "Changing tunnel " + tunnel.getName() + " to state " + state);
-        toolsInstaller.ensureToolsAvailable();
+        Application.getToolsInstaller().ensureToolsAvailable();
         setStateInternal(tunnel, tunnel.getConfig(), state);
         return getState(tunnel);
     }
@@ -106,23 +109,17 @@ public final class WgQuickBackend implements Backend {
     private void setStateInternal(final Tunnel tunnel, final Config config, final State state)
             throws Exception {
         final File tempFile = new File(localTemporaryDir, tunnel.getName() + ".conf");
-        try (FileOutputStream stream = new FileOutputStream(tempFile, false)) {
+        try (final FileOutputStream stream = new FileOutputStream(tempFile, false)) {
             stream.write(config.toString().getBytes(StandardCharsets.UTF_8));
         }
-        final String command = String.format("wg-quick %s '%s'",
+        String command = String.format("wg-quick %s '%s'",
                 state.toString().toLowerCase(), tempFile.getAbsolutePath());
-        final int result = rootShell.run(null, command);
+        if (state == State.UP)
+            command = "cat /sys/module/wireguard/version && " + command;
+        final int result = Application.getRootShell().run(null, command);
         // noinspection ResultOfMethodCallIgnored
         tempFile.delete();
         if (result != 0)
             throw new Exception("Unable to configure tunnel (wg-quick returned " + result + ')');
     }
-
-    public static final class WgQuickChangeReceiver extends BroadcastReceiver {
-        @Override
-        public void onReceive(final Context context, final Intent intent) {
-            Log.d(TAG, "Refreshing tunnel states");
-            Application.getComponent().getTunnelManager().refreshTunnelStates();
-        }
-    }
 }

app/src/main/java/com/wireguard/android/configStore/FileConfigStore.java

@@ -9,7 +9,6 @@ package com.wireguard.android.configStore;
 import android.content.Context;
 import android.util.Log;
 
-import com.wireguard.android.Application.ApplicationContext;
 import com.wireguard.config.Config;
 
 import java.io.File;
@@ -32,7 +31,7 @@ public final class FileConfigStore implements ConfigStore {
 
     private final Context context;
 
-    public FileConfigStore(@ApplicationContext final Context context) {
+    public FileConfigStore(final Context context) {
         this.context = context;
     }
 
@@ -42,7 +41,7 @@ public final class FileConfigStore implements ConfigStore {
         final File file = fileFor(name);
         if (!file.createNewFile())
             throw new IOException("Configuration file " + file.getName() + " already exists");
-        try (FileOutputStream stream = new FileOutputStream(file, false)) {
+        try (final FileOutputStream stream = new FileOutputStream(file, false)) {
             stream.write(config.toString().getBytes(StandardCharsets.UTF_8));
         }
         return config;
@@ -70,7 +69,7 @@ public final class FileConfigStore implements ConfigStore {
 
     @Override
     public Config load(final String name) throws IOException {
-        try (FileInputStream stream = new FileInputStream(fileFor(name))) {
+        try (final FileInputStream stream = new FileInputStream(fileFor(name))) {
             return Config.from(stream);
         }
     }
@@ -95,7 +94,7 @@ public final class FileConfigStore implements ConfigStore {
         final File file = fileFor(name);
         if (!file.isFile())
             throw new FileNotFoundException("Configuration file " + file.getName() + " not found");
-        try (FileOutputStream stream = new FileOutputStream(file, false)) {
+        try (final FileOutputStream stream = new FileOutputStream(file, false)) {
             stream.write(config.toString().getBytes(StandardCharsets.UTF_8));
         }
         return config;

app/src/main/java/com/wireguard/android/databinding/BindingAdapters.java

@@ -15,7 +15,7 @@ import android.widget.ListView;
 import android.widget.TextView;
 
 import com.wireguard.android.R;
-import com.wireguard.android.util.Keyed;
+import com.wireguard.util.Keyed;
 import com.wireguard.android.util.ObservableKeyedList;
 import com.wireguard.android.widget.ToggleSwitch;
 import com.wireguard.android.widget.ToggleSwitch.OnBeforeCheckedChangeListener;

app/src/main/java/com/wireguard/android/databinding/ObservableKeyedListAdapter.java

@@ -16,7 +16,7 @@ import android.view.ViewGroup;
 import android.widget.BaseAdapter;
 
 import com.wireguard.android.BR;
-import com.wireguard.android.util.Keyed;
+import com.wireguard.util.Keyed;
 import com.wireguard.android.util.ObservableKeyedList;
 
 import java.lang.ref.WeakReference;

app/src/main/java/com/wireguard/android/fragment/TunnelEditorFragment.java

@@ -128,7 +128,7 @@ public class TunnelEditorFragment extends BaseFragment {
                 }
                 if (tunnel == null) {
                     Log.d(TAG, "Attempting to create new tunnel " + binding.getConfig().getName());
-                    final TunnelManager manager = Application.getComponent().getTunnelManager();
+                    final TunnelManager manager = Application.getTunnelManager();
                     manager.create(binding.getConfig().getName(), newConfig)
                             .whenComplete(this::onTunnelCreated);
                 } else if (!tunnel.getName().equals(binding.getConfig().getName())) {
@@ -169,6 +169,7 @@ public class TunnelEditorFragment extends BaseFragment {
             tunnel = newTunnel;
             message = getString(R.string.tunnel_create_success, tunnel.getName());
             Log.d(TAG, message);
+            Toast.makeText(getContext(), message, Toast.LENGTH_SHORT).show();
             onFinished();
         } else {
             final String error = ExceptionLoggers.unwrapMessage(throwable);

app/src/main/java/com/wireguard/android/fragment/TunnelListFragment.java

@@ -34,13 +34,10 @@ import android.widget.AdapterView.OnItemClickListener;
 import android.widget.AdapterView.OnItemLongClickListener;
 
 import com.wireguard.android.Application;
-import com.wireguard.android.Application.ApplicationComponent;
 import com.wireguard.android.R;
 import com.wireguard.android.activity.TunnelCreatorActivity;
 import com.wireguard.android.databinding.TunnelListFragmentBinding;
 import com.wireguard.android.model.Tunnel;
-import com.wireguard.android.model.TunnelManager;
-import com.wireguard.android.util.AsyncWorker;
 import com.wireguard.android.util.ExceptionLoggers;
 import com.wireguard.config.Config;
 
@@ -70,9 +67,7 @@ public class TunnelListFragment extends BaseFragment {
     private final MultiChoiceModeListener actionModeListener = new ActionModeListener();
     private final ListViewCallbacks listViewCallbacks = new ListViewCallbacks();
     private ActionMode actionMode;
-    private AsyncWorker asyncWorker;
     private TunnelListFragmentBinding binding;
-    private TunnelManager tunnelManager;
 
     public boolean collapseActionMenu() {
         if (binding.createMenu.isExpanded()) {
@@ -90,7 +85,7 @@ public class TunnelListFragment extends BaseFragment {
 
         final Collection<CompletableFuture<Tunnel>> futureTunnels = new ArrayList<>();
         final List<Throwable> throwables = new ArrayList<>();
-        asyncWorker.supplyAsync(() -> {
+        Application.getAsyncWorker().supplyAsync(() -> {
             final String[] columns = {OpenableColumns.DISPLAY_NAME};
             String name = null;
             try (Cursor cursor = contentResolver.query(uri, columns,
@@ -137,11 +132,11 @@ public class TunnelListFragment extends BaseFragment {
                             throwables.add(e);
                         }
                         if (config != null)
-                            futureTunnels.add(tunnelManager.create(name, config).toCompletableFuture());
+                            futureTunnels.add(Application.getTunnelManager().create(name, config).toCompletableFuture());
                     }
                 }
             } else {
-                futureTunnels.add(tunnelManager.create(name,
+                futureTunnels.add(Application.getTunnelManager().create(name,
                         Config.from(contentResolver.openInputStream(uri))).toCompletableFuture());
             }
 
@@ -190,9 +185,6 @@ public class TunnelListFragment extends BaseFragment {
     @Override
     public void onCreate(final Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        final ApplicationComponent applicationComponent = Application.getComponent();
-        asyncWorker = applicationComponent.getAsyncWorker();
-        tunnelManager = applicationComponent.getTunnelManager();
     }
 
     @Override
@@ -229,6 +221,12 @@ public class TunnelListFragment extends BaseFragment {
             binding.createMenu.collapse();
     }
 
+    @Override
+    public void onPause() {
+        binding.createMenu.collapse();
+        super.onPause();
+    }
+
     @Override
     public void onSelectedTunnelChanged(final Tunnel oldTunnel, final Tunnel newTunnel) {
         // Do nothing.
@@ -269,16 +267,15 @@ public class TunnelListFragment extends BaseFragment {
                     tunnels.size() + throwables.size(),
                     tunnels.size(), tunnels.size() + throwables.size());
 
-        if (binding != null) {
+        if (binding != null)
             Snackbar.make(binding.mainContainer, message, Snackbar.LENGTH_LONG).show();
-        }
     }
 
     @Override
     public void onViewStateRestored(final Bundle savedInstanceState) {
         super.onViewStateRestored(savedInstanceState);
         binding.setFragment(this);
-        binding.setTunnels(tunnelManager.getTunnels());
+        binding.setTunnels(Application.getTunnelManager().getTunnels());
     }
 
     private final class ActionModeListener implements MultiChoiceModeListener {
@@ -343,7 +340,11 @@ public class TunnelListFragment extends BaseFragment {
 
         private void updateTitle(final ActionMode mode) {
             final int count = (int) getCheckedPositions().count();
-            mode.setTitle(resources.getQuantityString(R.plurals.delete_title, count, count));
+            if (count == 0) {
+                mode.setTitle("");
+            } else {
+                mode.setTitle(resources.getQuantityString(R.plurals.delete_title, count, count));
+            }
         }
     }
 

app/src/main/java/com/wireguard/android/model/Tunnel.java

@@ -13,7 +13,7 @@ import android.support.annotation.Nullable;
 
 import com.wireguard.android.BR;
 import com.wireguard.android.util.ExceptionLoggers;
-import com.wireguard.android.util.Keyed;
+import com.wireguard.util.Keyed;
 import com.wireguard.config.Config;
 
 import java.util.regex.Pattern;

app/src/main/java/com/wireguard/android/model/TunnelManager.java

@@ -6,30 +6,29 @@
 
 package com.wireguard.android.model;
 
-import android.content.SharedPreferences;
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
 import android.databinding.BaseObservable;
 import android.databinding.Bindable;
 import android.support.annotation.NonNull;
 
-import com.wireguard.android.Application.ApplicationScope;
+import com.wireguard.android.Application;
 import com.wireguard.android.BR;
-import com.wireguard.android.backend.Backend;
 import com.wireguard.android.configStore.ConfigStore;
 import com.wireguard.android.model.Tunnel.State;
 import com.wireguard.android.model.Tunnel.Statistics;
-import com.wireguard.android.util.AsyncWorker;
 import com.wireguard.android.util.ExceptionLoggers;
 import com.wireguard.android.util.ObservableKeyedList;
 import com.wireguard.android.util.ObservableSortedKeyedArrayList;
 import com.wireguard.android.util.ObservableSortedKeyedList;
 import com.wireguard.config.Config;
 
+import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Comparator;
 import java.util.Set;
 
-import javax.inject.Inject;
-
 import java9.util.Comparators;
 import java9.util.concurrent.CompletableFuture;
 import java9.util.concurrent.CompletionStage;
@@ -40,7 +39,6 @@ import java9.util.stream.StreamSupport;
  * Maintains and mediates changes to the set of available WireGuard tunnels,
  */
 
-@ApplicationScope
 public final class TunnelManager extends BaseObservable {
     private static final Comparator<String> COMPARATOR = Comparators.<String>thenComparing(
             String.CASE_INSENSITIVE_ORDER, Comparators.naturalOrder());
@@ -48,21 +46,15 @@ public final class TunnelManager extends BaseObservable {
     private static final String KEY_RESTORE_ON_BOOT = "restore_on_boot";
     private static final String KEY_RUNNING_TUNNELS = "enabled_configs";
 
-    private final AsyncWorker asyncWorker;
-    private final Backend backend;
     private final ConfigStore configStore;
-    private final SharedPreferences preferences;
     private final ObservableSortedKeyedList<String, Tunnel> tunnels =
             new ObservableSortedKeyedArrayList<>(COMPARATOR);
     private Tunnel lastUsedTunnel;
+    private boolean haveLoaded;
+    private final ArrayList<CompletableFuture<Void>> delayedLoadRestoreTunnels = new ArrayList<>();
 
-    @Inject
-    public TunnelManager(final AsyncWorker asyncWorker, final Backend backend,
-                         final ConfigStore configStore, final SharedPreferences preferences) {
-        this.asyncWorker = asyncWorker;
-        this.backend = backend;
+    public TunnelManager(final ConfigStore configStore) {
         this.configStore = configStore;
-        this.preferences = preferences;
     }
 
     private Tunnel addToList(final String name, final Config config, final State state) {
@@ -78,7 +70,7 @@ public final class TunnelManager extends BaseObservable {
             final String message = "Tunnel " + name + " already exists";
             return CompletableFuture.failedFuture(new IllegalArgumentException(message));
         }
-        return asyncWorker.supplyAsync(() -> configStore.create(name, config))
+        return Application.getAsyncWorker().supplyAsync(() -> configStore.create(name, config))
                 .thenApply(savedConfig -> addToList(name, savedConfig, State.DOWN));
     }
 
@@ -89,14 +81,14 @@ public final class TunnelManager extends BaseObservable {
         if (wasLastUsed)
             setLastUsedTunnel(null);
         tunnels.remove(tunnel);
-        return asyncWorker.runAsync(() -> {
+        return Application.getAsyncWorker().runAsync(() -> {
             if (originalState == State.UP)
-                backend.setState(tunnel, State.DOWN);
+                Application.getBackend().setState(tunnel, State.DOWN);
             try {
                 configStore.delete(tunnel.getName());
             } catch (final Exception e) {
                 if (originalState == State.UP)
-                    backend.setState(tunnel, State.UP);
+                    Application.getBackend().setState(tunnel, State.UP);
                 // Re-throw the exception to fail the completion.
                 throw e;
             }
@@ -116,17 +108,17 @@ public final class TunnelManager extends BaseObservable {
     }
 
     CompletionStage<Config> getTunnelConfig(final Tunnel tunnel) {
-        return asyncWorker.supplyAsync(() -> configStore.load(tunnel.getName()))
+        return Application.getAsyncWorker().supplyAsync(() -> configStore.load(tunnel.getName()))
                 .thenApply(tunnel::onConfigChanged);
     }
 
     CompletionStage<State> getTunnelState(final Tunnel tunnel) {
-        return asyncWorker.supplyAsync(() -> backend.getState(tunnel))
+        return Application.getAsyncWorker().supplyAsync(() -> Application.getBackend().getState(tunnel))
                 .thenApply(tunnel::onStateChanged);
     }
 
     CompletionStage<Statistics> getTunnelStatistics(final Tunnel tunnel) {
-        return asyncWorker.supplyAsync(() -> backend.getStatistics(tunnel))
+        return Application.getAsyncWorker().supplyAsync(() -> Application.getBackend().getStatistics(tunnel))
                 .thenApply(tunnel::onStatisticsChanged);
     }
 
@@ -135,21 +127,36 @@ public final class TunnelManager extends BaseObservable {
     }
 
     public void onCreate() {
-        asyncWorker.supplyAsync(configStore::enumerate)
-                .thenAcceptBoth(asyncWorker.supplyAsync(backend::enumerate), this::onTunnelsLoaded)
+        Application.getAsyncWorker().supplyAsync(configStore::enumerate)
+                .thenAcceptBoth(Application.getAsyncWorker().supplyAsync(() -> Application.getBackend().enumerate()), this::onTunnelsLoaded)
                 .whenComplete(ExceptionLoggers.E);
     }
 
+    @SuppressWarnings("unchecked")
     private void onTunnelsLoaded(final Iterable<String> present, final Collection<String> running) {
         for (final String name : present)
             addToList(name, null, running.contains(name) ? State.UP : State.DOWN);
-        final String lastUsedName = preferences.getString(KEY_LAST_USED_TUNNEL, null);
+        final String lastUsedName = Application.getSharedPreferences().getString(KEY_LAST_USED_TUNNEL, null);
         if (lastUsedName != null)
             setLastUsedTunnel(tunnels.get(lastUsedName));
+        final CompletableFuture<Void>[] toComplete;
+        synchronized (delayedLoadRestoreTunnels) {
+            haveLoaded = true;
+            toComplete = delayedLoadRestoreTunnels.toArray(new CompletableFuture[delayedLoadRestoreTunnels.size()]);
+            delayedLoadRestoreTunnels.clear();
+        }
+        restoreState(true).whenComplete((v, t) -> {
+            for (final CompletableFuture<Void> f : toComplete) {
+                if (t == null)
+                    f.complete(v);
+                else
+                    f.completeExceptionally(t);
+            }
+        });
     }
 
     public void refreshTunnelStates() {
-        asyncWorker.supplyAsync(backend::enumerate)
+        Application.getAsyncWorker().supplyAsync(() -> Application.getBackend().enumerate())
                 .thenAccept(running -> {
                     for (final Tunnel tunnel : tunnels)
                         tunnel.onStateChanged(running.contains(tunnel.getName()) ? State.UP : State.DOWN);
@@ -157,10 +164,17 @@ public final class TunnelManager extends BaseObservable {
                 .whenComplete(ExceptionLoggers.E);
     }
 
-    public CompletionStage<Void> restoreState() {
-        if (!preferences.getBoolean(KEY_RESTORE_ON_BOOT, false))
+    public CompletionStage<Void> restoreState(final boolean force) {
+        if (!force && !Application.getSharedPreferences().getBoolean(KEY_RESTORE_ON_BOOT, false))
             return CompletableFuture.completedFuture(null);
-        final Set<String> previouslyRunning = preferences.getStringSet(KEY_RUNNING_TUNNELS, null);
+        synchronized (delayedLoadRestoreTunnels) {
+            if (!haveLoaded) {
+                final CompletableFuture<Void> f = new CompletableFuture<>();
+                delayedLoadRestoreTunnels.add(f);
+                return f;
+            }
+        }
+        final Set<String> previouslyRunning = Application.getSharedPreferences().getStringSet(KEY_RUNNING_TUNNELS, null);
         if (previouslyRunning == null)
             return CompletableFuture.completedFuture(null);
         return CompletableFuture.allOf(StreamSupport.stream(tunnels)
@@ -174,7 +188,7 @@ public final class TunnelManager extends BaseObservable {
                 .filter(tunnel -> tunnel.getState() == State.UP)
                 .map(Tunnel::getName)
                 .collect(Collectors.toUnmodifiableSet());
-        preferences.edit().putStringSet(KEY_RUNNING_TUNNELS, runningTunnels).apply();
+        Application.getSharedPreferences().edit().putStringSet(KEY_RUNNING_TUNNELS, runningTunnels).apply();
     }
 
     private void setLastUsedTunnel(final Tunnel tunnel) {
@@ -183,14 +197,14 @@ public final class TunnelManager extends BaseObservable {
         lastUsedTunnel = tunnel;
         notifyPropertyChanged(BR.lastUsedTunnel);
         if (tunnel != null)
-            preferences.edit().putString(KEY_LAST_USED_TUNNEL, tunnel.getName()).apply();
+            Application.getSharedPreferences().edit().putString(KEY_LAST_USED_TUNNEL, tunnel.getName()).apply();
         else
-            preferences.edit().remove(KEY_LAST_USED_TUNNEL).apply();
+            Application.getSharedPreferences().edit().remove(KEY_LAST_USED_TUNNEL).apply();
     }
 
     CompletionStage<Config> setTunnelConfig(final Tunnel tunnel, final Config config) {
-        return asyncWorker.supplyAsync(() -> {
-            final Config appliedConfig = backend.applyConfig(tunnel, config);
+        return Application.getAsyncWorker().supplyAsync(() -> {
+            final Config appliedConfig = Application.getBackend().applyConfig(tunnel, config);
             return configStore.save(tunnel.getName(), appliedConfig);
         }).thenApply(tunnel::onConfigChanged);
     }
@@ -208,13 +222,13 @@ public final class TunnelManager extends BaseObservable {
         if (wasLastUsed)
             setLastUsedTunnel(null);
         tunnels.remove(tunnel);
-        return asyncWorker.supplyAsync(() -> {
+        return Application.getAsyncWorker().supplyAsync(() -> {
             if (originalState == State.UP)
-                backend.setState(tunnel, State.DOWN);
+                Application.getBackend().setState(tunnel, State.DOWN);
             configStore.rename(tunnel.getName(), name);
             final String newName = tunnel.onNameChanged(name);
             if (originalState == State.UP)
-                backend.setState(tunnel, State.UP);
+                Application.getBackend().setState(tunnel, State.UP);
             return newName;
         }).whenComplete((newName, e) -> {
             // On failure, we don't know what state the tunnel might be in. Fix that.
@@ -230,12 +244,52 @@ public final class TunnelManager extends BaseObservable {
     CompletionStage<State> setTunnelState(final Tunnel tunnel, final State state) {
         // Ensure the configuration is loaded before trying to use it.
         return tunnel.getConfigAsync().thenCompose(x ->
-                asyncWorker.supplyAsync(() -> backend.setState(tunnel, state))
+                Application.getAsyncWorker().supplyAsync(() -> Application.getBackend().setState(tunnel, state))
         ).whenComplete((newState, e) -> {
             // Ensure onStateChanged is always called (failure or not), and with the correct state.
             tunnel.onStateChanged(e == null ? newState : tunnel.getState());
             if (e == null && newState == State.UP)
                 setLastUsedTunnel(tunnel);
+            saveState();
         });
     }
+
+    public static final class IntentReceiver extends BroadcastReceiver {
+        @Override
+        public void onReceive(final Context context, final Intent intent) {
+            final TunnelManager manager = Application.getTunnelManager();
+            if (intent == null)
+                return;
+            final String action = intent.getAction();
+            if (action == null)
+                return;
+
+            if ("com.wireguard.android.action.REFRESH_TUNNEL_STATES".equals(action)) {
+                manager.refreshTunnelStates();
+                return;
+            }
+
+            /* We disable the below, for now, as the security model of allowing this
+             * might take a bit more consideration.
+             */
+            if (true)
+                return;
+
+            final State state;
+            if ("com.wireguard.android.action.SET_TUNNEL_UP".equals(action))
+                state = State.UP;
+            else if ("com.wireguard.android.action.SET_TUNNEL_DOWN".equals(action))
+                state = State.DOWN;
+            else
+                return;
+
+            final String tunnelName = intent.getStringExtra("tunnel");
+            if (tunnelName == null)
+                return;
+            final Tunnel tunnel = manager.getTunnels().get(tunnelName);
+            if (tunnel == null)
+                return;
+            manager.setTunnelState(tunnel, state);
+        }
+    }
 }

app/src/main/java/com/wireguard/android/preference/LogExporterPreference.java

@@ -0,0 +1,115 @@
+/*
+ * Copyright © 2018 Samuel Holland <samuel@sholland.org>
+ * Copyright © 2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+package com.wireguard.android.preference;
+
+import android.Manifest;
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.os.Environment;
+import android.support.design.widget.Snackbar;
+import android.support.v7.preference.Preference;
+import android.util.AttributeSet;
+import android.util.Log;
+
+import com.wireguard.android.Application;
+import com.wireguard.android.R;
+import com.wireguard.android.util.ExceptionLoggers;
+import com.wireguard.android.util.FragmentUtils;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+/**
+ * Preference implementing a button that asynchronously exports logs.
+ */
+
+public class LogExporterPreference extends Preference {
+    private static final String TAG = "WireGuard/" + LogExporterPreference.class.getSimpleName();
+
+    private String exportedFilePath;
+
+    public LogExporterPreference(final Context context, final AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    private void exportLog() {
+        Application.getAsyncWorker().supplyAsync(() -> {
+            final File path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
+            final File file = new File(path, "wireguard-log.txt");
+            if (!path.isDirectory() && !path.mkdirs())
+                throw new IOException("Cannot create output directory");
+
+            /* We would like to simply run `builder.redirectOutput(file);`, but this is API 26.
+             * Instead we have to do this dance, since logcat appends.
+             */
+            new FileOutputStream(file).close();
+
+            try {
+                final Process process = Runtime.getRuntime().exec(new String[]{
+                        "logcat", "-b", "all", "-d", "-v", "threadtime", "-f", file.getAbsolutePath(), "*:V"});
+                if (process.waitFor() != 0) {
+                    try (final BufferedReader reader = new BufferedReader(new InputStreamReader(process.getErrorStream()))) {
+                        final StringBuilder errors = new StringBuilder();
+                        errors.append("Unable to run logcat: ");
+                        String line;
+                        while ((line = reader.readLine()) != null)
+                            errors.append(line);
+                        throw new Exception(errors.toString());
+                    }
+                }
+            } catch (final Exception e) {
+                // noinspection ResultOfMethodCallIgnored
+                file.delete();
+                throw e;
+            }
+            return file.getAbsolutePath();
+        }).whenComplete(this::exportLogComplete);
+    }
+
+    private void exportLogComplete(final String filePath, final Throwable throwable) {
+        if (throwable != null) {
+            final String error = ExceptionLoggers.unwrapMessage(throwable);
+            final String message = getContext().getString(R.string.log_export_error, error);
+            Log.e(TAG, message, throwable);
+            Snackbar.make(
+                    FragmentUtils.getPrefActivity(this).findViewById(android.R.id.content),
+                    message, Snackbar.LENGTH_LONG).show();
+            setEnabled(true);
+        } else {
+            exportedFilePath = filePath;
+            notifyChanged();
+        }
+    }
+
+    @Override
+    public CharSequence getSummary() {
+        return exportedFilePath == null ?
+                getContext().getString(R.string.log_export_summary) :
+                getContext().getString(R.string.log_export_success, exportedFilePath);
+    }
+
+    @Override
+    public CharSequence getTitle() {
+        return getContext().getString(R.string.log_exporter_title);
+    }
+
+    @Override
+    protected void onClick() {
+        FragmentUtils.getPrefActivity(this).ensurePermissions(
+                new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
+                (permissions, granted) -> {
+                    if (granted.length > 0 && granted[0] == PackageManager.PERMISSION_GRANTED) {
+                        setEnabled(false);
+                        exportLog();
+                    }
+                });
+    }
+
+}

app/src/main/java/com/wireguard/android/preference/ToolsInstallerPreference.java

@@ -9,13 +9,10 @@ package com.wireguard.android.preference;
 import android.content.Context;
 import android.support.annotation.NonNull;
 import android.support.v7.preference.Preference;
-import android.system.OsConstants;
 import android.util.AttributeSet;
 
 import com.wireguard.android.Application;
-import com.wireguard.android.Application.ApplicationComponent;
 import com.wireguard.android.R;
-import com.wireguard.android.util.AsyncWorker;
 import com.wireguard.android.util.ToolsInstaller;
 
 /**
@@ -24,16 +21,10 @@ import com.wireguard.android.util.ToolsInstaller;
  */
 
 public class ToolsInstallerPreference extends Preference {
-    private final AsyncWorker asyncWorker;
-    private final ToolsInstaller toolsInstaller;
     private State state = State.INITIAL;
 
-    @SuppressWarnings({"SameParameterValue", "WeakerAccess"})
     public ToolsInstallerPreference(final Context context, final AttributeSet attrs) {
         super(context, attrs);
-        final ApplicationComponent applicationComponent = Application.getComponent();
-        asyncWorker = applicationComponent.getAsyncWorker();
-        toolsInstaller = applicationComponent.getToolsInstaller();
     }
 
     @Override
@@ -49,31 +40,37 @@ public class ToolsInstallerPreference extends Preference {
     @Override
     public void onAttached() {
         super.onAttached();
-        asyncWorker.supplyAsync(toolsInstaller::areInstalled).whenComplete(this::onCheckResult);
+        Application.getAsyncWorker().supplyAsync(Application.getToolsInstaller()::areInstalled).whenComplete(this::onCheckResult);
     }
 
-    private void onCheckResult(final Integer result, final Throwable throwable) {
-        setState(throwable == null && result == OsConstants.EALREADY ?
-                State.ALREADY : State.INITIAL);
+    private void onCheckResult(final int state, final Throwable throwable) {
+        if (throwable != null || state == ToolsInstaller.ERROR)
+            setState(State.INITIAL);
+        else if ((state & ToolsInstaller.YES) == ToolsInstaller.YES)
+            setState(State.ALREADY);
+        else if ((state & (ToolsInstaller.MAGISK | ToolsInstaller.NO)) == (ToolsInstaller.MAGISK | ToolsInstaller.NO))
+            setState(State.INITIAL_MAGISK);
+        else if ((state & (ToolsInstaller.SYSTEM | ToolsInstaller.NO)) == (ToolsInstaller.SYSTEM | ToolsInstaller.NO))
+            setState(State.INITIAL_SYSTEM);
+        else
+            setState(State.INITIAL);
     }
 
     @Override
     protected void onClick() {
         setState(State.WORKING);
-        asyncWorker.supplyAsync(toolsInstaller::install).whenComplete(this::onInstallResult);
+        Application.getAsyncWorker().supplyAsync(Application.getToolsInstaller()::install).whenComplete(this::onInstallResult);
     }
 
     private void onInstallResult(final Integer result, final Throwable throwable) {
-        final State nextState;
         if (throwable != null)
-            nextState = State.FAILURE;
-        else if (result == OsConstants.EXIT_SUCCESS)
-            nextState = State.SUCCESS;
-        else if (result == OsConstants.EALREADY)
-            nextState = State.ALREADY;
+            setState(State.FAILURE);
+        else if ((result & (ToolsInstaller.YES | ToolsInstaller.MAGISK)) == (ToolsInstaller.YES | ToolsInstaller.MAGISK))
+            setState(State.SUCCESS_MAGISK);
+        else if ((result & (ToolsInstaller.YES | ToolsInstaller.SYSTEM)) == (ToolsInstaller.YES | ToolsInstaller.SYSTEM))
+            setState(State.SUCCESS_SYSTEM);
         else
-            nextState = State.FAILURE;
-        setState(nextState);
+            setState(State.FAILURE);
     }
 
     private void setState(@NonNull final State state) {
@@ -86,11 +83,14 @@ public class ToolsInstallerPreference extends Preference {
     }
 
     private enum State {
+        INITIAL(R.string.tools_installer_initial, true),
         ALREADY(R.string.tools_installer_already, false),
         FAILURE(R.string.tools_installer_failure, true),
-        INITIAL(R.string.tools_installer_initial, true),
-        SUCCESS(R.string.tools_installer_success, false),
-        WORKING(R.string.tools_installer_working, false);
+        WORKING(R.string.tools_installer_working, false),
+        INITIAL_SYSTEM(R.string.tools_installer_initial_system, true),
+        SUCCESS_SYSTEM(R.string.tools_installer_success_system, false),
+        INITIAL_MAGISK(R.string.tools_installer_initial_magisk, true),
+        SUCCESS_MAGISK(R.string.tools_installer_success_magisk, false);
 
         private final int messageResourceId;
         private final boolean shouldEnableView;

app/src/main/java/com/wireguard/android/preference/VersionPreference.java

@@ -0,0 +1,52 @@
+/*
+ * Copyright © 2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+package com.wireguard.android.preference;
+
+import android.content.Context;
+import android.content.Intent;
+import android.net.Uri;
+import android.support.v7.preference.Preference;
+import android.util.AttributeSet;
+
+import com.wireguard.android.Application;
+import com.wireguard.android.BuildConfig;
+import com.wireguard.android.R;
+
+public class VersionPreference extends Preference {
+    private String versionSummary;
+
+    public VersionPreference(final Context context, final AttributeSet attrs) {
+        super(context, attrs);
+
+        Application.onHaveBackend(backend -> {
+            versionSummary = getContext().getString(R.string.version_summary_checking, backend.getTypeName().toLowerCase());
+            Application.getAsyncWorker().supplyAsync(backend::getVersion).whenComplete((version, exception) -> {
+                versionSummary = exception == null
+                        ? getContext().getString(R.string.version_summary, backend.getTypeName(), version)
+                        : getContext().getString(R.string.version_summary_unknown, backend.getTypeName().toLowerCase());
+                notifyChanged();
+            });
+        });
+    }
+
+    @Override
+    public CharSequence getSummary() {
+        return versionSummary;
+    }
+
+    @Override
+    public CharSequence getTitle() {
+        return getContext().getString(R.string.version_title, BuildConfig.VERSION_NAME);
+    }
+
+    @Override
+    protected void onClick() {
+        final Intent intent = new Intent(Intent.ACTION_VIEW);
+        intent.setData(Uri.parse("https://www.wireguard.com/"));
+        getContext().startActivity(intent);
+    }
+
+}

app/src/main/java/com/wireguard/android/preference/ZipExporterPreference.java

@@ -14,16 +14,12 @@ import android.support.design.widget.Snackbar;
 import android.support.v7.preference.Preference;
 import android.util.AttributeSet;
 import android.util.Log;
-import android.view.ContextThemeWrapper;
 
 import com.wireguard.android.Application;
-import com.wireguard.android.Application.ApplicationComponent;
 import com.wireguard.android.R;
-import com.wireguard.android.activity.SettingsActivity;
 import com.wireguard.android.model.Tunnel;
-import com.wireguard.android.model.TunnelManager;
-import com.wireguard.android.util.AsyncWorker;
 import com.wireguard.android.util.ExceptionLoggers;
+import com.wireguard.android.util.FragmentUtils;
 import com.wireguard.config.Config;
 
 import java.io.File;
@@ -44,30 +40,14 @@ import java9.util.concurrent.CompletableFuture;
 public class ZipExporterPreference extends Preference {
     private static final String TAG = "WireGuard/" + ZipExporterPreference.class.getSimpleName();
 
-    private final AsyncWorker asyncWorker;
-    private final TunnelManager tunnelManager;
     private String exportedFilePath;
 
-    @SuppressWarnings({"SameParameterValue", "WeakerAccess"})
     public ZipExporterPreference(final Context context, final AttributeSet attrs) {
         super(context, attrs);
-        final ApplicationComponent applicationComponent = Application.getComponent();
-        asyncWorker = applicationComponent.getAsyncWorker();
-        tunnelManager = applicationComponent.getTunnelManager();
-    }
-
-    private static SettingsActivity getPrefActivity(final Preference preference) {
-        final Context context = preference.getContext();
-        if (context instanceof ContextThemeWrapper) {
-            if (((ContextThemeWrapper) context).getBaseContext() instanceof SettingsActivity) {
-                return ((SettingsActivity) ((ContextThemeWrapper) context).getBaseContext());
-            }
-        }
-        return null;
     }
 
     private void exportZip() {
-        final List<Tunnel> tunnels = new ArrayList<>(tunnelManager.getTunnels());
+        final List<Tunnel> tunnels = new ArrayList<>(Application.getTunnelManager().getTunnels());
         final List<CompletableFuture<Config>> futureConfigs = new ArrayList<>(tunnels.size());
         for (final Tunnel tunnel : tunnels)
             futureConfigs.add(tunnel.getConfigAsync().toCompletableFuture());
@@ -76,7 +56,7 @@ public class ZipExporterPreference extends Preference {
             return;
         }
         CompletableFuture.allOf(futureConfigs.toArray(new CompletableFuture[futureConfigs.size()]))
-                .whenComplete((ignored1, exception) -> asyncWorker.supplyAsync(() -> {
+                .whenComplete((ignored1, exception) -> Application.getAsyncWorker().supplyAsync(() -> {
                     if (exception != null)
                         throw exception;
                     final File path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
@@ -90,8 +70,7 @@ public class ZipExporterPreference extends Preference {
                                     toString().getBytes(StandardCharsets.UTF_8));
                         }
                         zip.closeEntry();
-                        zip.close();
-                    } catch (Exception e) {
+                    } catch (final Exception e) {
                         // noinspection ResultOfMethodCallIgnored
                         file.delete();
                         throw e;
@@ -103,14 +82,14 @@ public class ZipExporterPreference extends Preference {
     private void exportZipComplete(final String filePath, final Throwable throwable) {
         if (throwable != null) {
             final String error = ExceptionLoggers.unwrapMessage(throwable);
-            final String message = getContext().getString(R.string.export_error, error);
+            final String message = getContext().getString(R.string.zip_export_error, error);
             Log.e(TAG, message, throwable);
             Snackbar.make(
-                    getPrefActivity(this).findViewById(android.R.id.content),
+                    FragmentUtils.getPrefActivity(this).findViewById(android.R.id.content),
                     message, Snackbar.LENGTH_LONG).show();
+            setEnabled(true);
         } else {
             exportedFilePath = filePath;
-            setEnabled(false);
             notifyChanged();
         }
     }
@@ -118,8 +97,8 @@ public class ZipExporterPreference extends Preference {
     @Override
     public CharSequence getSummary() {
         return exportedFilePath == null ?
-                getContext().getString(R.string.export_summary) :
-                getContext().getString(R.string.export_success, exportedFilePath);
+                getContext().getString(R.string.zip_export_summary) :
+                getContext().getString(R.string.zip_export_success, exportedFilePath);
     }
 
     @Override
@@ -129,11 +108,13 @@ public class ZipExporterPreference extends Preference {
 
     @Override
     protected void onClick() {
-        getPrefActivity(this).ensurePermissions(
+        FragmentUtils.getPrefActivity(this).ensurePermissions(
                 new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
                 (permissions, granted) -> {
-                    if (granted.length > 0 && granted[0] == PackageManager.PERMISSION_GRANTED)
+                    if (granted.length > 0 && granted[0] == PackageManager.PERMISSION_GRANTED) {
+                        setEnabled(false);
                         exportZip();
+                    }
                 });
     }
 

app/src/main/java/com/wireguard/android/util/AsyncWorker.java

@@ -8,13 +8,8 @@ package com.wireguard.android.util;
 
 import android.os.Handler;
 
-import com.wireguard.android.Application.ApplicationHandler;
-import com.wireguard.android.Application.ApplicationScope;
-
 import java.util.concurrent.Executor;
 
-import javax.inject.Inject;
-
 import java9.util.concurrent.CompletableFuture;
 import java9.util.concurrent.CompletionStage;
 
@@ -22,13 +17,11 @@ import java9.util.concurrent.CompletionStage;
  * Helper class for running asynchronous tasks and ensuring they are completed on the main thread.
  */
 
-@ApplicationScope
 public class AsyncWorker {
     private final Executor executor;
     private final Handler handler;
 
-    @Inject
-    AsyncWorker(final Executor executor, @ApplicationHandler final Handler handler) {
+    public AsyncWorker(final Executor executor, final Handler handler) {
         this.executor = executor;
         this.handler = handler;
     }

app/src/main/java/com/wireguard/android/util/FragmentUtils.java

@@ -0,0 +1,25 @@
+/*
+ * Copyright © 2018 Harsh Shandilya <msfjarvis@gmail.com>
+ * Copyright © 2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+package com.wireguard.android.util;
+
+import android.content.Context;
+import android.support.v7.preference.Preference;
+import android.view.ContextThemeWrapper;
+
+import com.wireguard.android.activity.SettingsActivity;
+
+public class FragmentUtils {
+
+    public static SettingsActivity getPrefActivity(final Preference preference) {
+        final Context context = preference.getContext();
+        if (context instanceof ContextThemeWrapper) {
+            if (((ContextThemeWrapper) context).getBaseContext() instanceof SettingsActivity) {
+                return ((SettingsActivity) ((ContextThemeWrapper) context).getBaseContext());
+            }
+        }
+        return null;
+    }
+}

app/src/main/java/com/wireguard/android/util/ObservableKeyedArrayList.java

@@ -9,6 +9,8 @@ package com.wireguard.android.util;
 import android.databinding.ObservableArrayList;
 import android.support.annotation.NonNull;
 
+import com.wireguard.util.Keyed;
+
 import java.util.Collection;
 import java.util.ListIterator;
 import java.util.Objects;

app/src/main/java/com/wireguard/android/util/ObservableKeyedList.java

@@ -8,6 +8,9 @@ package com.wireguard.android.util;
 
 import android.databinding.ObservableList;
 
+import com.wireguard.util.Keyed;
+import com.wireguard.util.KeyedList;
+
 /**
  * A list that is both keyed and observable.
  */

app/src/main/java/com/wireguard/android/util/ObservableSortedKeyedArrayList.java

@@ -8,6 +8,9 @@ package com.wireguard.android.util;
 
 import android.support.annotation.NonNull;
 
+import com.wireguard.util.Keyed;
+import com.wireguard.util.SortedKeyedList;
+
 import java.util.AbstractList;
 import java.util.Collection;
 import java.util.Collections;

app/src/main/java/com/wireguard/android/util/ObservableSortedKeyedList.java

@@ -6,6 +6,9 @@
 
 package com.wireguard.android.util;
 
+import com.wireguard.util.Keyed;
+import com.wireguard.util.SortedKeyedList;
+
 /**
  * A list that is both sorted/keyed and observable.
  */

app/src/main/java/com/wireguard/android/util/RootShell.java

@@ -9,8 +9,6 @@ package com.wireguard.android.util;
 import android.content.Context;
 import android.util.Log;
 
-import com.wireguard.android.Application.ApplicationContext;
-import com.wireguard.android.Application.ApplicationScope;
 import com.wireguard.android.R;
 
 import java.io.BufferedReader;
@@ -23,13 +21,10 @@ import java.nio.charset.StandardCharsets;
 import java.util.Collection;
 import java.util.UUID;
 
-import javax.inject.Inject;
-
 /**
  * Helper class for running commands as root.
  */
 
-@ApplicationScope
 public class RootShell {
     private static final String SU = "su";
     private static final String TAG = "WireGuard/" + RootShell.class.getSimpleName();
@@ -44,8 +39,7 @@ public class RootShell {
     private OutputStreamWriter stdin;
     private BufferedReader stdout;
 
-    @Inject
-    public RootShell(@ApplicationContext final Context context) {
+    public RootShell(final Context context) {
         deviceNotRootedMessage = context.getString(R.string.error_root);
         final File cacheDir = context.getCacheDir();
         localBinaryDir = new File(cacheDir, "bin");

app/src/main/java/com/wireguard/android/util/SharedLibraryLoader.java

@@ -0,0 +1,75 @@
+/*
+ * Copyright © 2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+package com.wireguard.android.util;
+
+import android.content.Context;
+import android.os.Build;
+import android.util.Log;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipFile;
+
+public final class SharedLibraryLoader {
+    private static final String TAG = "WireGuard/" + SharedLibraryLoader.class.getSimpleName();
+
+    private SharedLibraryLoader() {
+    }
+
+    public static void loadSharedLibrary(final Context context, final String libName) {
+        Throwable noAbiException;
+        try {
+            System.loadLibrary(libName);
+            return;
+        } catch (final UnsatisfiedLinkError e) {
+            Log.d(TAG, "Failed to load library normally, so attempting to extract from apk", e);
+            noAbiException = e;
+        }
+
+        final ZipFile zipFile;
+        try {
+            zipFile = new ZipFile(new File(context.getApplicationInfo().sourceDir), ZipFile.OPEN_READ);
+        } catch (final IOException e) {
+            throw new RuntimeException(e);
+        }
+
+        final String mappedLibName = System.mapLibraryName(libName);
+        final byte[] buffer = new byte[1024 * 32];
+        for (final String abi : Build.SUPPORTED_ABIS) {
+            final String libZipPath = "lib" + File.separatorChar + abi + File.separatorChar + mappedLibName;
+            final ZipEntry zipEntry = zipFile.getEntry(libZipPath);
+            if (zipEntry == null)
+                continue;
+            File f = null;
+            try {
+                f = File.createTempFile("lib", ".so", context.getCacheDir());
+                Log.d(TAG, "Extracting apk:/" + libZipPath + " to " + f.getAbsolutePath() + " and loading");
+                try (final FileOutputStream out = new FileOutputStream(f);
+                     final InputStream in = zipFile.getInputStream(zipEntry)) {
+                    int len;
+                    while ((len = in.read(buffer)) != -1) {
+                        out.write(buffer, 0, len);
+                    }
+                }
+                System.load(f.getAbsolutePath());
+                return;
+            } catch (final Exception e) {
+                Log.d(TAG, "Failed to load library apk:/" + libZipPath, e);
+                noAbiException = e;
+            } finally {
+                if (f != null)
+                    // noinspection ResultOfMethodCallIgnored
+                    f.delete();
+            }
+        }
+        if (noAbiException instanceof RuntimeException)
+            throw (RuntimeException) noAbiException;
+        throw new RuntimeException(noAbiException);
+    }
+}

app/src/main/java/com/wireguard/android/util/ToolsInstaller.java

@@ -10,8 +10,8 @@ import android.content.Context;
 import android.system.OsConstants;
 import android.util.Log;
 
-import com.wireguard.android.Application.ApplicationContext;
-import com.wireguard.android.Application.ApplicationScope;
+import com.wireguard.android.Application;
+import com.wireguard.android.BuildConfig;
 import com.wireguard.android.util.RootShell.NoRootException;
 
 import java.io.File;
@@ -20,14 +20,17 @@ import java.io.IOException;
 import java.util.Arrays;
 import java.util.List;
 
-import javax.inject.Inject;
-
 /**
  * Helper to install WireGuard tools to the system partition.
  */
 
-@ApplicationScope
 public final class ToolsInstaller {
+    public static final int ERROR = 0x0;
+    public static final int YES = 0x1;
+    public static final int NO = 0x2;
+    public static final int MAGISK = 0x4;
+    public static final int SYSTEM = 0x8;
+
     private static final String[][] EXECUTABLES = {
             {"libwg.so", "wg"},
             {"libwg-quick.so", "wg-quick"},
@@ -42,14 +45,12 @@ public final class ToolsInstaller {
     private final File localBinaryDir;
     private final Object lock = new Object();
     private final File nativeLibraryDir;
-    private final RootShell rootShell;
     private Boolean areToolsAvailable;
+    private Boolean installAsMagiskModule;
 
-    @Inject
-    public ToolsInstaller(@ApplicationContext final Context context, final RootShell rootShell) {
+    public ToolsInstaller(final Context context) {
         localBinaryDir = new File(context.getCacheDir(), "bin");
         nativeLibraryDir = new File(context.getApplicationInfo().nativeLibraryDir);
-        this.rootShell = rootShell;
     }
 
     private static File getInstallDir() {
@@ -57,15 +58,16 @@ public final class ToolsInstaller {
         if (path == null)
             return INSTALL_DIRS[0];
         final List<String> paths = Arrays.asList(path.split(":"));
-        for (final File dir : INSTALL_DIRS)
+        for (final File dir : INSTALL_DIRS) {
             if (paths.contains(dir.getPath()) && dir.isDirectory())
                 return dir;
+        }
         return null;
     }
 
     public int areInstalled() throws NoRootException {
         if (INSTALL_DIR == null)
-            return OsConstants.ENOENT;
+            return ERROR;
         final StringBuilder script = new StringBuilder();
         for (final String[] names : EXECUTABLES) {
             script.append(String.format("cmp -s '%s' '%s' && ",
@@ -74,9 +76,13 @@ public final class ToolsInstaller {
         }
         script.append("exit ").append(OsConstants.EALREADY).append(';');
         try {
-            return rootShell.run(null, script.toString());
+            final int ret = Application.getRootShell().run(null, script.toString());
+            if (ret == OsConstants.EALREADY)
+                return willInstallAsMagiskModule() ? YES | MAGISK : YES | SYSTEM;
+            else
+                return willInstallAsMagiskModule() ? NO | MAGISK : NO | SYSTEM;
         } catch (final IOException ignored) {
-            return OsConstants.EXIT_FAILURE;
+            return ERROR;
         }
     }
 
@@ -100,7 +106,20 @@ public final class ToolsInstaller {
         }
     }
 
-    public int install() throws NoRootException {
+    private boolean willInstallAsMagiskModule() {
+        synchronized (lock) {
+            if (installAsMagiskModule == null) {
+                try {
+                    installAsMagiskModule = Application.getRootShell().run(null, "[ -d /sbin/.core/mirror -a -d /sbin/.core/img -a ! -f /cache/.disable_magisk ]") == OsConstants.EXIT_SUCCESS;
+                } catch (final Exception ignored) {
+                    installAsMagiskModule = false;
+                }
+            }
+            return installAsMagiskModule;
+        }
+    }
+
+    private int installSystem() throws NoRootException {
         if (INSTALL_DIR == null)
             return OsConstants.ENOENT;
         final StringBuilder script = new StringBuilder("set -ex; ");
@@ -111,12 +130,37 @@ public final class ToolsInstaller {
                     new File(nativeLibraryDir, names[0]), destination, destination, destination));
         }
         try {
-            return rootShell.run(null, script.toString());
+            return Application.getRootShell().run(null, script.toString()) == 0 ? YES | SYSTEM : ERROR;
         } catch (final IOException ignored) {
-            return OsConstants.EXIT_FAILURE;
+            return ERROR;
         }
     }
 
+    private int installMagisk() throws NoRootException {
+        final StringBuilder script = new StringBuilder("set -ex; ");
+
+        script.append("trap 'rm -rf /sbin/.core/img/wireguard' INT TERM EXIT; ");
+        script.append(String.format("rm -rf /sbin/.core/img/wireguard/; mkdir -p /sbin/.core/img/wireguard%s; ", INSTALL_DIR));
+        script.append(String.format("printf 'name=WireGuard Command Line Tools\nversion=%s\nversionCode=%s\nauthor=zx2c4\ndescription=Command line tools for WireGuard\nminMagisk=1500\n' > /sbin/.core/img/wireguard/module.prop; ", BuildConfig.VERSION_NAME, BuildConfig.VERSION_CODE));
+        script.append("touch /sbin/.core/img/wireguard/auto_mount; ");
+        for (final String[] names : EXECUTABLES) {
+            final File destination = new File("/sbin/.core/img/wireguard" + INSTALL_DIR, names[1]);
+            script.append(String.format("cp '%s' '%s'; chmod 755 '%s'; restorecon '%s' || true; ",
+                    new File(nativeLibraryDir, names[0]), destination, destination, destination));
+        }
+        script.append("trap - INT TERM EXIT;");
+
+        try {
+            return Application.getRootShell().run(null, script.toString()) == 0 ? YES | MAGISK : ERROR;
+        } catch (final IOException ignored) {
+            return ERROR;
+        }
+    }
+
+    public int install() throws NoRootException {
+        return willInstallAsMagiskModule() ? installMagisk() : installSystem();
+    }
+
     public int symlink() throws NoRootException {
         final StringBuilder script = new StringBuilder("set -x; ");
         for (final String[] names : EXECUTABLES) {
@@ -134,7 +178,7 @@ public final class ToolsInstaller {
         script.append("exit ").append(OsConstants.EXIT_SUCCESS).append(';');
 
         try {
-            return rootShell.run(null, script.toString());
+            return Application.getRootShell().run(null, script.toString());
         } catch (final IOException ignored) {
             return OsConstants.EXIT_FAILURE;
         }

app/src/main/java/com/wireguard/android/widget/fab/AddFloatingActionButton.java

@@ -0,0 +1,97 @@
+/*
+ * Copyright © 2014 Jerzy Chalupski
+ * Copyright © 2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+package com.wireguard.android.widget.fab;
+
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.graphics.Canvas;
+import android.graphics.Paint;
+import android.graphics.Paint.Style;
+import android.graphics.drawable.Drawable;
+import android.graphics.drawable.ShapeDrawable;
+import android.graphics.drawable.shapes.Shape;
+import android.support.annotation.ColorRes;
+import android.support.annotation.DrawableRes;
+import android.support.v4.content.ContextCompat;
+import android.util.AttributeSet;
+
+import com.wireguard.android.R;
+
+public class AddFloatingActionButton extends FloatingActionButton {
+    int mPlusColor;
+
+    public AddFloatingActionButton(final Context context) {
+        this(context, null);
+    }
+
+    public AddFloatingActionButton(final Context context, final AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public AddFloatingActionButton(final Context context, final AttributeSet attrs, final int defStyle) {
+        super(context, attrs, defStyle);
+    }
+
+    @Override
+    void init(final Context context, final AttributeSet attributeSet) {
+        final TypedArray attr = context.obtainStyledAttributes(attributeSet, R.styleable.AddFloatingActionButton, 0, 0);
+        mPlusColor = attr.getColor(R.styleable.AddFloatingActionButton_fab_plusIconColor, FloatingActionButton.getColorFromTheme(context, android.R.attr.colorBackground, android.R.color.white));
+        attr.recycle();
+
+        super.init(context, attributeSet);
+    }
+
+    /**
+     * @return the current Color of plus icon.
+     */
+    public int getPlusColor() {
+        return mPlusColor;
+    }
+
+    public void setPlusColor(final int color) {
+        if (mPlusColor != color) {
+            mPlusColor = color;
+            updateBackground();
+        }
+    }
+
+    public void setPlusColorResId(@ColorRes final int plusColor) {
+        setPlusColor(ContextCompat.getColor(getContext(), plusColor));
+    }
+
+    @Override
+    public void setIcon(@DrawableRes final int icon) {
+        throw new UnsupportedOperationException("Use FloatingActionButton if you want to use custom icon");
+    }
+
+    @Override
+    Drawable getIconDrawable() {
+        final float iconSize = getDimension(R.dimen.fab_icon_size);
+        final float iconHalfSize = iconSize / 2f;
+
+        final float plusSize = getDimension(R.dimen.fab_plus_icon_size);
+        final float plusHalfStroke = getDimension(R.dimen.fab_plus_icon_stroke) / 2f;
+        final float plusOffset = (iconSize - plusSize) / 2f;
+
+        final Shape shape = new Shape() {
+            @Override
+            public void draw(final Canvas canvas, final Paint paint) {
+                canvas.drawRect(plusOffset, iconHalfSize - plusHalfStroke, iconSize - plusOffset, iconHalfSize + plusHalfStroke, paint);
+                canvas.drawRect(iconHalfSize - plusHalfStroke, plusOffset, iconHalfSize + plusHalfStroke, iconSize - plusOffset, paint);
+            }
+        };
+
+        final ShapeDrawable drawable = new ShapeDrawable(shape);
+
+        final Paint paint = drawable.getPaint();
+        paint.setColor(mPlusColor);
+        paint.setStyle(Style.FILL);
+        paint.setAntiAlias(true);
+
+        return drawable;
+    }
+}

app/src/main/java/com/wireguard/android/widget/fab/FloatingActionButton.java

@@ -0,0 +1,446 @@
+/*
+ * Copyright © 2014 Jerzy Chalupski
+ * Copyright © 2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+package com.wireguard.android.widget.fab;
+
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.LinearGradient;
+import android.graphics.Paint;
+import android.graphics.Paint.Style;
+import android.graphics.Rect;
+import android.graphics.Shader;
+import android.graphics.Shader.TileMode;
+import android.graphics.drawable.ColorDrawable;
+import android.graphics.drawable.Drawable;
+import android.graphics.drawable.LayerDrawable;
+import android.graphics.drawable.ShapeDrawable;
+import android.graphics.drawable.ShapeDrawable.ShaderFactory;
+import android.graphics.drawable.StateListDrawable;
+import android.graphics.drawable.shapes.OvalShape;
+import android.support.annotation.ColorRes;
+import android.support.annotation.DimenRes;
+import android.support.annotation.DrawableRes;
+import android.support.annotation.IntDef;
+import android.support.annotation.NonNull;
+import android.support.v4.content.ContextCompat;
+import android.support.v7.widget.AppCompatImageButton;
+import android.util.AttributeSet;
+import android.widget.TextView;
+
+import com.wireguard.android.R;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+
+public class FloatingActionButton extends AppCompatImageButton {
+
+    public static final int SIZE_NORMAL = 0;
+    public static final int SIZE_MINI = 1;
+    int mColorNormal;
+    int mColorPressed;
+    int mColorDisabled;
+    String mTitle;
+    boolean mStrokeVisible;
+    @DrawableRes
+    private int mIcon;
+    private Drawable mIconDrawable;
+    private int mSize;
+
+    private float mCircleSize;
+    private float mShadowRadius;
+    private float mShadowOffset;
+    private int mDrawableSize;
+    public FloatingActionButton(final Context context) {
+        this(context, null);
+    }
+
+    public FloatingActionButton(final Context context, final AttributeSet attrs) {
+        super(context, attrs);
+        init(context, attrs);
+    }
+
+    public FloatingActionButton(final Context context, final AttributeSet attrs, final int defStyle) {
+        super(context, attrs, defStyle);
+        init(context, attrs);
+    }
+
+    public static int getColorFromTheme(final Context context, final int themeResource, @ColorRes final int fallback) {
+        final TypedArray a = context.obtainStyledAttributes(new int[]{themeResource});
+        try {
+            return a.getColor(0, ContextCompat.getColor(context, fallback));
+        } finally {
+            a.recycle();
+        }
+    }
+
+    void init(final Context context, final AttributeSet attributeSet) {
+        final TypedArray attr = context.obtainStyledAttributes(attributeSet,
+                R.styleable.FloatingActionButton, 0, 0);
+        mColorNormal = attr.getColor(R.styleable.FloatingActionButton_fab_colorNormal,
+                getColorFromTheme(context, android.R.attr.colorAccent, android.R.color.holo_blue_bright));
+        mColorPressed = attr.getColor(R.styleable.FloatingActionButton_fab_colorPressed,
+                darkenOrLightenColor(mColorNormal)); //TODO(msf): use getColorForState on the accent color from theme instead to get darker states
+        mColorDisabled = attr.getColor(R.styleable.FloatingActionButton_fab_colorDisabled,
+                ContextCompat.getColor(context, android.R.color.darker_gray)); //TODO(msf): load from theme
+        mSize = attr.getInt(R.styleable.FloatingActionButton_fab_size, SIZE_NORMAL);
+        mIcon = attr.getResourceId(R.styleable.FloatingActionButton_fab_icon, 0);
+        mTitle = attr.getString(R.styleable.FloatingActionButton_fab_title);
+        mStrokeVisible = attr.getBoolean(R.styleable.FloatingActionButton_fab_stroke_visible, true);
+        attr.recycle();
+
+        updateCircleSize();
+        mShadowRadius = getDimension(R.dimen.fab_shadow_radius);
+        mShadowOffset = getDimension(R.dimen.fab_shadow_offset);
+        updateDrawableSize();
+
+        updateBackground();
+    }
+
+    private void updateDrawableSize() {
+        mDrawableSize = (int) (mCircleSize + 2 * mShadowRadius);
+    }
+
+    private void updateCircleSize() {
+        mCircleSize = getDimension(mSize == SIZE_NORMAL ? R.dimen.fab_size_normal : R.dimen.fab_size_mini);
+    }
+
+    @FAB_SIZE
+    public int getSize() {
+        return mSize;
+    }
+
+    public void setSize(@FAB_SIZE final int size) {
+        if (size != SIZE_MINI && size != SIZE_NORMAL) {
+            throw new IllegalArgumentException("Use @FAB_SIZE constants only!");
+        }
+
+        if (mSize != size) {
+            mSize = size;
+            updateCircleSize();
+            updateDrawableSize();
+            updateBackground();
+        }
+    }
+
+    public void setIcon(@DrawableRes final int icon) {
+        if (mIcon != icon) {
+            mIcon = icon;
+            mIconDrawable = null;
+            updateBackground();
+        }
+    }
+
+    /**
+     * @return the current Color for normal state.
+     */
+    public int getColorNormal() {
+        return mColorNormal;
+    }
+
+    public void setColorNormal(final int color) {
+        if (mColorNormal != color) {
+            mColorNormal = color;
+            updateBackground();
+        }
+    }
+
+    public void setColorNormalResId(@ColorRes final int colorNormal) {
+        setColorNormal(ContextCompat.getColor(getContext(), colorNormal));
+    }
+
+    /**
+     * @return the current color for pressed state.
+     */
+    public int getColorPressed() {
+        return mColorPressed;
+    }
+
+    public void setColorPressed(final int color) {
+        if (mColorPressed != color) {
+            mColorPressed = color;
+            updateBackground();
+        }
+    }
+
+    public void setColorPressedResId(@ColorRes final int colorPressed) {
+        setColorPressed(ContextCompat.getColor(getContext(), colorPressed));
+    }
+
+    /**
+     * @return the current color for disabled state.
+     */
+    public int getColorDisabled() {
+        return mColorDisabled;
+    }
+
+    public void setColorDisabled(final int color) {
+        if (mColorDisabled != color) {
+            mColorDisabled = color;
+            updateBackground();
+        }
+    }
+
+    public void setColorDisabledResId(@ColorRes final int colorDisabled) {
+        setColorDisabled(ContextCompat.getColor(getContext(), colorDisabled));
+    }
+
+    public boolean isStrokeVisible() {
+        return mStrokeVisible;
+    }
+
+    public void setStrokeVisible(final boolean visible) {
+        if (mStrokeVisible != visible) {
+            mStrokeVisible = visible;
+            updateBackground();
+        }
+    }
+
+    float getDimension(@DimenRes final int id) {
+        return getResources().getDimension(id);
+    }
+
+    TextView getLabelView() {
+        return (TextView) getTag(R.id.fab_label);
+    }
+
+    public String getTitle() {
+        return mTitle;
+    }
+
+    public void setTitle(final String title) {
+        mTitle = title;
+        final TextView label = getLabelView();
+        if (label != null) {
+            label.setText(title);
+        }
+    }
+
+    @Override
+    protected void onMeasure(final int widthMeasureSpec, final int heightMeasureSpec) {
+        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
+        setMeasuredDimension(mDrawableSize, mDrawableSize);
+    }
+
+    void updateBackground() {
+        final float strokeWidth = getDimension(R.dimen.fab_stroke_width);
+        final float halfStrokeWidth = strokeWidth / 2f;
+
+        final LayerDrawable layerDrawable = new LayerDrawable(
+                new Drawable[]{
+                        //TODO(msf); replace these pngs with programatic elevation
+                        getResources().getDrawable(mSize == SIZE_NORMAL ? R.drawable.fab_bg_normal : R.drawable.fab_bg_mini, null),
+                        createFillDrawable(strokeWidth),
+                        createOuterStrokeDrawable(strokeWidth),
+                        getIconDrawable()
+                });
+
+        final int iconOffset = (int) (mCircleSize - getDimension(R.dimen.fab_icon_size)) / 2;
+
+        final int circleInsetHorizontal = (int) (mShadowRadius);
+        final int circleInsetTop = (int) (mShadowRadius - mShadowOffset);
+        final int circleInsetBottom = (int) (mShadowRadius + mShadowOffset);
+
+        layerDrawable.setLayerInset(1,
+                circleInsetHorizontal,
+                circleInsetTop,
+                circleInsetHorizontal,
+                circleInsetBottom);
+
+        layerDrawable.setLayerInset(2,
+                (int) (circleInsetHorizontal - halfStrokeWidth),
+                (int) (circleInsetTop - halfStrokeWidth),
+                (int) (circleInsetHorizontal - halfStrokeWidth),
+                (int) (circleInsetBottom - halfStrokeWidth));
+
+        layerDrawable.setLayerInset(3,
+                circleInsetHorizontal + iconOffset,
+                circleInsetTop + iconOffset,
+                circleInsetHorizontal + iconOffset,
+                circleInsetBottom + iconOffset);
+
+        setBackground(layerDrawable);
+    }
+
+    Drawable getIconDrawable() {
+        if (mIconDrawable != null) {
+            return mIconDrawable;
+        } else if (mIcon != 0) {
+            return ContextCompat.getDrawable(getContext(), mIcon);
+        } else {
+            return new ColorDrawable(Color.TRANSPARENT);
+        }
+    }
+
+    public void setIconDrawable(@NonNull final Drawable iconDrawable) {
+        if (mIconDrawable != iconDrawable) {
+            mIcon = 0;
+            mIconDrawable = iconDrawable;
+            updateBackground();
+        }
+    }
+
+    private StateListDrawable createFillDrawable(final float strokeWidth) {
+        final StateListDrawable drawable = new StateListDrawable();
+        drawable.addState(new int[]{-android.R.attr.state_enabled}, createCircleDrawable(mColorDisabled, strokeWidth));
+        drawable.addState(new int[]{android.R.attr.state_pressed}, createCircleDrawable(mColorPressed, strokeWidth));
+        drawable.addState(new int[]{}, createCircleDrawable(mColorNormal, strokeWidth));
+        return drawable;
+    }
+
+    private Drawable createCircleDrawable(final int color, final float strokeWidth) {
+        final int alpha = Color.alpha(color);
+        final int opaqueColor = opaque(color);
+
+        final ShapeDrawable fillDrawable = new ShapeDrawable(new OvalShape());
+
+        final Paint paint = fillDrawable.getPaint();
+        paint.setAntiAlias(true);
+        paint.setColor(opaqueColor);
+
+        final Drawable[] layers = {
+                fillDrawable,
+                createInnerStrokesDrawable(opaqueColor, strokeWidth)
+        };
+
+        final LayerDrawable drawable = alpha == 255 || !mStrokeVisible
+                ? new LayerDrawable(layers)
+                : new TranslucentLayerDrawable(alpha, layers);
+
+        final int halfStrokeWidth = (int) (strokeWidth / 2f);
+        drawable.setLayerInset(1, halfStrokeWidth, halfStrokeWidth, halfStrokeWidth, halfStrokeWidth);
+
+        return drawable;
+    }
+
+    private static Drawable createOuterStrokeDrawable(final float strokeWidth) {
+        final ShapeDrawable shapeDrawable = new ShapeDrawable(new OvalShape());
+
+        final Paint paint = shapeDrawable.getPaint();
+        paint.setAntiAlias(true);
+        paint.setStrokeWidth(strokeWidth);
+        paint.setStyle(Style.STROKE);
+        paint.setColor(Color.BLACK);
+        paint.setAlpha(opacityToAlpha(0.02f));
+
+        return shapeDrawable;
+    }
+
+    private static int opacityToAlpha(final float opacity) {
+        return (int) (255f * opacity);
+    }
+
+    private static int darkenColor(final int argb) {
+        return adjustColorBrightness(argb, 0.9f);
+    }
+
+    private static int lightenColor(final int argb) {
+        return adjustColorBrightness(argb, 1.1f);
+    }
+
+    public static int darkenOrLightenColor(final int argb) {
+        final float[] hsv = new float[3];
+        Color.colorToHSV(argb, hsv);
+        final float factor;
+        if (hsv[2] < 0.2)
+            factor = 1.2f;
+        else
+            factor = 0.8f;
+
+        hsv[2] = Math.min(hsv[2] * factor, 1f);
+        return Color.HSVToColor(Color.alpha(argb), hsv);
+    }
+
+    private static int adjustColorBrightness(final int argb, final float factor) {
+        final float[] hsv = new float[3];
+        Color.colorToHSV(argb, hsv);
+
+        hsv[2] = Math.min(hsv[2] * factor, 1f);
+
+        return Color.HSVToColor(Color.alpha(argb), hsv);
+    }
+
+    private static int halfTransparent(final int argb) {
+        return Color.argb(
+                Color.alpha(argb) / 2,
+                Color.red(argb),
+                Color.green(argb),
+                Color.blue(argb)
+        );
+    }
+
+    private static int opaque(final int argb) {
+        return Color.rgb(
+                Color.red(argb),
+                Color.green(argb),
+                Color.blue(argb)
+        );
+    }
+
+    private Drawable createInnerStrokesDrawable(final int color, final float strokeWidth) {
+        if (!mStrokeVisible) {
+            return new ColorDrawable(Color.TRANSPARENT);
+        }
+
+        final ShapeDrawable shapeDrawable = new ShapeDrawable(new OvalShape());
+
+        final int bottomStrokeColor = darkenColor(color);
+        final int bottomStrokeColorHalfTransparent = halfTransparent(bottomStrokeColor);
+        final int topStrokeColor = lightenColor(color);
+        final int topStrokeColorHalfTransparent = halfTransparent(topStrokeColor);
+
+        final Paint paint = shapeDrawable.getPaint();
+        paint.setAntiAlias(true);
+        paint.setStrokeWidth(strokeWidth);
+        paint.setStyle(Style.STROKE);
+        shapeDrawable.setShaderFactory(new ShaderFactory() {
+            @Override
+            public Shader resize(int width, int height) {
+                return new LinearGradient(width / 2, 0, width / 2, height,
+                        new int[]{topStrokeColor, topStrokeColorHalfTransparent, color, bottomStrokeColorHalfTransparent, bottomStrokeColor},
+                        new float[]{0f, 0.2f, 0.5f, 0.8f, 1f},
+                        TileMode.CLAMP
+                );
+            }
+        });
+
+        return shapeDrawable;
+    }
+
+    @Override
+    public void setVisibility(final int visibility) {
+        final TextView label = getLabelView();
+        if (label != null) {
+            label.setVisibility(visibility);
+        }
+
+        super.setVisibility(visibility);
+    }
+
+    @Retention(RetentionPolicy.SOURCE)
+    @IntDef({SIZE_NORMAL, SIZE_MINI})
+    public @interface FAB_SIZE {
+    }
+
+    private static final class TranslucentLayerDrawable extends LayerDrawable {
+        private final int mAlpha;
+
+        private TranslucentLayerDrawable(final int alpha, final Drawable... layers) {
+            super(layers);
+            mAlpha = alpha;
+        }
+
+        @Override
+        public void draw(final Canvas canvas) {
+            final Rect bounds = getBounds();
+            canvas.saveLayerAlpha(bounds.left, bounds.top, bounds.right, bounds.bottom, mAlpha);
+            super.draw(canvas);
+            canvas.restore();
+        }
+    }
+}

app/src/main/java/com/wireguard/android/widget/fab/FloatingActionsMenu.java

@@ -0,0 +1,635 @@
+/*
+ * Copyright © 2014 Jerzy Chalupski
+ * Copyright © 2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+package com.wireguard.android.widget.fab;
+
+import android.animation.Animator;
+import android.animation.AnimatorListenerAdapter;
+import android.animation.AnimatorSet;
+import android.animation.ObjectAnimator;
+import android.animation.TimeInterpolator;
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.graphics.Canvas;
+import android.graphics.Rect;
+import android.graphics.drawable.Drawable;
+import android.graphics.drawable.LayerDrawable;
+import android.os.Parcel;
+import android.os.Parcelable;
+import android.support.annotation.Keep;
+import android.support.annotation.NonNull;
+import android.support.v7.widget.AppCompatTextView;
+import android.util.AttributeSet;
+import android.view.ContextThemeWrapper;
+import android.view.TouchDelegate;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.animation.DecelerateInterpolator;
+import android.view.animation.OvershootInterpolator;
+import android.widget.TextView;
+
+import com.wireguard.android.R;
+
+@SuppressWarnings("ReturnOfInnerClass")
+public class FloatingActionsMenu extends ViewGroup {
+    public static final int EXPAND_UP = 0;
+    public static final int EXPAND_DOWN = 1;
+    public static final int EXPAND_LEFT = 2;
+    public static final int EXPAND_RIGHT = 3;
+
+    public static final int LABELS_ON_LEFT_SIDE = 0;
+    public static final int LABELS_ON_RIGHT_SIDE = 1;
+
+    private static final int ANIMATION_DURATION = 300;
+    private static final float COLLAPSED_PLUS_ROTATION = 0f;
+    private static final float EXPANDED_PLUS_ROTATION = 90f + 45f;
+    private static final TimeInterpolator EXPAND_INTERPOLATOR = new OvershootInterpolator();
+    private static final TimeInterpolator COLLAPSE_INTERPOLATOR = new DecelerateInterpolator(3f);
+    private static final TimeInterpolator ALPHA_EXPAND_INTERPOLATOR = new DecelerateInterpolator();
+    private int mAddButtonPlusColor;
+    private int mAddButtonColorNormal;
+    private int mAddButtonColorPressed;
+    private int mAddButtonSize;
+    private boolean mAddButtonStrokeVisible;
+    private int mExpandDirection;
+    private int mButtonSpacing;
+    private int mLabelsMargin;
+    private int mLabelsVerticalOffset;
+    private boolean mExpanded;
+    private final AnimatorSet mExpandAnimation = new AnimatorSet().setDuration(ANIMATION_DURATION);
+    private final AnimatorSet mCollapseAnimation = new AnimatorSet().setDuration(ANIMATION_DURATION);
+    private AddFloatingActionButton mAddButton;
+    private RotatingDrawable mRotatingDrawable;
+    private int mMaxButtonWidth;
+    private int mMaxButtonHeight;
+    private int mLabelsStyle;
+    private int mLabelsPosition;
+    private int mButtonsCount;
+    private TouchDelegateGroup mTouchDelegateGroup;
+    private OnFloatingActionsMenuUpdateListener mListener;
+    private final Rect touchArea = new Rect(0, 0, 0, 0);
+
+    public FloatingActionsMenu(final Context context) {
+        this(context, null);
+    }
+
+    public FloatingActionsMenu(final Context context, final AttributeSet attrs) {
+        super(context, attrs);
+        init(context, attrs);
+    }
+
+    public FloatingActionsMenu(final Context context, final AttributeSet attrs, final int defStyle) {
+        super(context, attrs, defStyle);
+        init(context, attrs);
+    }
+
+    private void init(final Context context, final AttributeSet attributeSet) {
+        mButtonSpacing = (int) (getResources().getDimension(R.dimen.fab_actions_spacing) - getResources().getDimension(R.dimen.fab_shadow_radius) - getResources().getDimension(R.dimen.fab_shadow_offset));
+        mLabelsMargin = getResources().getDimensionPixelSize(R.dimen.fab_labels_margin);
+        mLabelsVerticalOffset = getResources().getDimensionPixelSize(R.dimen.fab_shadow_offset);
+
+        mTouchDelegateGroup = new TouchDelegateGroup(this);
+        setTouchDelegate(mTouchDelegateGroup);
+
+        final TypedArray attr = context.obtainStyledAttributes(attributeSet, R.styleable.FloatingActionsMenu, 0, 0);
+        mAddButtonPlusColor = attr.getColor(R.styleable.FloatingActionsMenu_fab_addButtonPlusIconColor,
+                FloatingActionButton.getColorFromTheme(context, android.R.attr.colorBackground, android.R.color.white));
+        mAddButtonColorNormal = attr.getColor(R.styleable.FloatingActionsMenu_fab_addButtonColorNormal,
+                FloatingActionButton.getColorFromTheme(context, android.R.attr.colorAccent, android.R.color.holo_blue_bright));
+        mAddButtonColorPressed = attr.getColor(R.styleable.FloatingActionsMenu_fab_addButtonColorPressed,
+                FloatingActionButton.darkenOrLightenColor(mAddButtonColorNormal)); //TODO(msf): use getColorForState on the accent color from theme instead to get darker states
+        mAddButtonSize = attr.getInt(R.styleable.FloatingActionsMenu_fab_addButtonSize, FloatingActionButton.SIZE_NORMAL);
+        mAddButtonStrokeVisible = attr.getBoolean(R.styleable.FloatingActionsMenu_fab_addButtonStrokeVisible, true);
+        mExpandDirection = attr.getInt(R.styleable.FloatingActionsMenu_fab_expandDirection, EXPAND_UP);
+        mLabelsStyle = attr.getResourceId(R.styleable.FloatingActionsMenu_fab_labelStyle, 0);
+        mLabelsPosition = attr.getInt(R.styleable.FloatingActionsMenu_fab_labelsPosition, LABELS_ON_LEFT_SIDE);
+        attr.recycle();
+
+        if (mLabelsStyle != 0 && expandsHorizontally()) {
+            throw new IllegalStateException("Action labels in horizontal expand orientation is not supported.");
+        }
+
+        createAddButton(context);
+    }
+
+    public void setOnFloatingActionsMenuUpdateListener(final OnFloatingActionsMenuUpdateListener listener) {
+        mListener = listener;
+    }
+
+    private boolean expandsHorizontally() {
+        return mExpandDirection == EXPAND_LEFT || mExpandDirection == EXPAND_RIGHT;
+    }
+
+    private void createAddButton(final Context context) {
+        mAddButton = new AddFloatingActionButton(context) {
+            @Override
+            void updateBackground() {
+                mPlusColor = mAddButtonPlusColor;
+                mColorNormal = mAddButtonColorNormal;
+                mColorPressed = mAddButtonColorPressed;
+                mStrokeVisible = mAddButtonStrokeVisible;
+                super.updateBackground();
+            }
+
+            @Override
+            Drawable getIconDrawable() {
+                final RotatingDrawable rotatingDrawable = new RotatingDrawable(super.getIconDrawable());
+                mRotatingDrawable = rotatingDrawable;
+
+                final TimeInterpolator interpolator = new OvershootInterpolator();
+
+                final ObjectAnimator collapseAnimator = ObjectAnimator.ofFloat(rotatingDrawable, "rotation", EXPANDED_PLUS_ROTATION, COLLAPSED_PLUS_ROTATION);
+                final ObjectAnimator expandAnimator = ObjectAnimator.ofFloat(rotatingDrawable, "rotation", COLLAPSED_PLUS_ROTATION, EXPANDED_PLUS_ROTATION);
+
+                collapseAnimator.setInterpolator(interpolator);
+                expandAnimator.setInterpolator(interpolator);
+
+                mExpandAnimation.play(expandAnimator);
+                mCollapseAnimation.play(collapseAnimator);
+
+                return rotatingDrawable;
+            }
+        };
+
+        mAddButton.setId(R.id.fab_expand_menu_button);
+        mAddButton.setSize(mAddButtonSize);
+        mAddButton.setOnClickListener(v -> toggle());
+
+        addView(mAddButton, super.generateDefaultLayoutParams());
+        mButtonsCount++;
+    }
+
+    public void addButton(final FloatingActionButton button) {
+        addView(button, mButtonsCount - 1);
+        mButtonsCount++;
+
+        if (mLabelsStyle != 0) {
+            createLabels();
+        }
+    }
+
+    public void removeButton(final FloatingActionButton button) {
+        removeView(button.getLabelView());
+        removeView(button);
+        button.setTag(R.id.fab_label, null);
+        mButtonsCount--;
+    }
+
+    @Override
+    protected void onMeasure(final int widthMeasureSpec, final int heightMeasureSpec) {
+        measureChildren(widthMeasureSpec, heightMeasureSpec);
+
+        int width = 0;
+        int height = 0;
+
+        mMaxButtonWidth = 0;
+        mMaxButtonHeight = 0;
+        int maxLabelWidth = 0;
+
+        for (int i = 0; i < mButtonsCount; i++) {
+            final View child = getChildAt(i);
+
+            if (child.getVisibility() == GONE) {
+                continue;
+            }
+
+            switch (mExpandDirection) {
+                case EXPAND_UP:
+                case EXPAND_DOWN:
+                    mMaxButtonWidth = Math.max(mMaxButtonWidth, child.getMeasuredWidth());
+                    height += child.getMeasuredHeight();
+                    break;
+                case EXPAND_LEFT:
+                case EXPAND_RIGHT:
+                    width += child.getMeasuredWidth();
+                    mMaxButtonHeight = Math.max(mMaxButtonHeight, child.getMeasuredHeight());
+                    break;
+            }
+
+            if (!expandsHorizontally()) {
+                final TextView label = (TextView) child.getTag(R.id.fab_label);
+                if (label != null) {
+                    maxLabelWidth = Math.max(maxLabelWidth, label.getMeasuredWidth());
+                }
+            }
+        }
+
+        if (expandsHorizontally()) {
+            height = mMaxButtonHeight;
+        } else {
+            width = mMaxButtonWidth + (maxLabelWidth > 0 ? maxLabelWidth + mLabelsMargin : 0);
+        }
+
+        switch (mExpandDirection) {
+            case EXPAND_UP:
+            case EXPAND_DOWN:
+                height += mButtonSpacing * (mButtonsCount - 1);
+                height = adjustForOvershoot(height);
+                break;
+            case EXPAND_LEFT:
+            case EXPAND_RIGHT:
+                width += mButtonSpacing * (mButtonsCount - 1);
+                width = adjustForOvershoot(width);
+                break;
+        }
+
+        setMeasuredDimension(width, height);
+    }
+
+    private static int adjustForOvershoot(final int dimension) {
+        return dimension * 12 / 10;
+    }
+
+    @Override
+    protected void onLayout(final boolean changed, final int l, final int t, final int r, final int b) {
+        switch (mExpandDirection) {
+            case EXPAND_UP:
+            case EXPAND_DOWN:
+                final boolean expandUp = mExpandDirection == EXPAND_UP;
+
+                if (changed) {
+                    mTouchDelegateGroup.clearTouchDelegates();
+                }
+
+                final int addButtonY = expandUp ? b - t - mAddButton.getMeasuredHeight() : 0;
+                // Ensure mAddButton is centered on the line where the buttons should be
+                final int buttonsHorizontalCenter = mLabelsPosition == LABELS_ON_LEFT_SIDE
+                        ? r - l - mMaxButtonWidth / 2
+                        : mMaxButtonWidth / 2;
+                final int addButtonLeft = buttonsHorizontalCenter - mAddButton.getMeasuredWidth() / 2;
+                mAddButton.layout(addButtonLeft, addButtonY, addButtonLeft + mAddButton.getMeasuredWidth(), addButtonY + mAddButton.getMeasuredHeight());
+
+                final int labelsOffset = mMaxButtonWidth / 2 + mLabelsMargin;
+                final int labelsXNearButton = mLabelsPosition == LABELS_ON_LEFT_SIDE
+                        ? buttonsHorizontalCenter - labelsOffset
+                        : buttonsHorizontalCenter + labelsOffset;
+
+                int nextY = expandUp ?
+                        addButtonY - mButtonSpacing :
+                        addButtonY + mAddButton.getMeasuredHeight() + mButtonSpacing;
+
+                for (int i = mButtonsCount - 1; i >= 0; i--) {
+                    final View child = getChildAt(i);
+
+                    if (child == mAddButton || child.getVisibility() == GONE) continue;
+
+                    final int childX = buttonsHorizontalCenter - child.getMeasuredWidth() / 2;
+                    final int childY = expandUp ? nextY - child.getMeasuredHeight() : nextY;
+                    child.layout(childX, childY, childX + child.getMeasuredWidth(), childY + child.getMeasuredHeight());
+
+                    final float collapsedTranslation = addButtonY - childY;
+                    final float expandedTranslation = 0f;
+
+                    child.setTranslationY(mExpanded ? expandedTranslation : collapsedTranslation);
+                    child.setAlpha(mExpanded ? 1f : 0f);
+
+                    final LayoutParams params = (LayoutParams) child.getLayoutParams();
+                    params.mCollapseDir.setFloatValues(expandedTranslation, collapsedTranslation);
+                    params.mExpandDir.setFloatValues(collapsedTranslation, expandedTranslation);
+                    params.setAnimationsTarget(child);
+
+                    final View label = (View) child.getTag(R.id.fab_label);
+                    if (label != null) {
+                        final int labelXAwayFromButton = mLabelsPosition == LABELS_ON_LEFT_SIDE
+                                ? labelsXNearButton - label.getMeasuredWidth()
+                                : labelsXNearButton + label.getMeasuredWidth();
+
+                        final int labelLeft = mLabelsPosition == LABELS_ON_LEFT_SIDE
+                                ? labelXAwayFromButton
+                                : labelsXNearButton;
+
+                        final int labelRight = mLabelsPosition == LABELS_ON_LEFT_SIDE
+                                ? labelsXNearButton
+                                : labelXAwayFromButton;
+
+                        final int labelTop = childY - mLabelsVerticalOffset + (child.getMeasuredHeight() - label.getMeasuredHeight()) / 2;
+
+                        label.layout(labelLeft, labelTop, labelRight, labelTop + label.getMeasuredHeight());
+
+                        touchArea.set(Math.min(childX, labelLeft),
+                                childY - mButtonSpacing / 2,
+                                Math.max(childX + child.getMeasuredWidth(), labelRight),
+                                childY + child.getMeasuredHeight() + mButtonSpacing / 2);
+                        mTouchDelegateGroup.addTouchDelegate(new TouchDelegate(touchArea, child));
+
+                        label.setTranslationY(mExpanded ? expandedTranslation : collapsedTranslation);
+                        label.setAlpha(mExpanded ? 1f : 0f);
+
+                        final LayoutParams labelParams = (LayoutParams) label.getLayoutParams();
+                        labelParams.mCollapseDir.setFloatValues(expandedTranslation, collapsedTranslation);
+                        labelParams.mExpandDir.setFloatValues(collapsedTranslation, expandedTranslation);
+                        labelParams.setAnimationsTarget(label);
+                    }
+
+                    nextY = expandUp ?
+                            childY - mButtonSpacing :
+                            childY + child.getMeasuredHeight() + mButtonSpacing;
+                }
+                break;
+
+            case EXPAND_LEFT:
+            case EXPAND_RIGHT:
+                final boolean expandLeft = mExpandDirection == EXPAND_LEFT;
+
+                final int addButtonX = expandLeft ? r - l - mAddButton.getMeasuredWidth() : 0;
+                // Ensure mAddButton is centered on the line where the buttons should be
+                final int addButtonTop = b - t - mMaxButtonHeight + (mMaxButtonHeight - mAddButton.getMeasuredHeight()) / 2;
+                mAddButton.layout(addButtonX, addButtonTop, addButtonX + mAddButton.getMeasuredWidth(), addButtonTop + mAddButton.getMeasuredHeight());
+
+                int nextX = expandLeft ?
+                        addButtonX - mButtonSpacing :
+                        addButtonX + mAddButton.getMeasuredWidth() + mButtonSpacing;
+
+                for (int i = mButtonsCount - 1; i >= 0; i--) {
+                    final View child = getChildAt(i);
+
+                    if (child == mAddButton || child.getVisibility() == GONE) continue;
+
+                    final int childX = expandLeft ? nextX - child.getMeasuredWidth() : nextX;
+                    final int childY = addButtonTop + (mAddButton.getMeasuredHeight() - child.getMeasuredHeight()) / 2;
+                    child.layout(childX, childY, childX + child.getMeasuredWidth(), childY + child.getMeasuredHeight());
+
+                    final float collapsedTranslation = addButtonX - childX;
+                    final float expandedTranslation = 0f;
+
+                    child.setTranslationX(mExpanded ? expandedTranslation : collapsedTranslation);
+                    child.setAlpha(mExpanded ? 1f : 0f);
+
+                    final LayoutParams params = (LayoutParams) child.getLayoutParams();
+                    params.mCollapseDir.setFloatValues(expandedTranslation, collapsedTranslation);
+                    params.mExpandDir.setFloatValues(collapsedTranslation, expandedTranslation);
+                    params.setAnimationsTarget(child);
+
+                    nextX = expandLeft ?
+                            childX - mButtonSpacing :
+                            childX + child.getMeasuredWidth() + mButtonSpacing;
+                }
+
+                break;
+        }
+    }
+
+    @Override
+    protected ViewGroup.LayoutParams generateDefaultLayoutParams() {
+        return new LayoutParams(super.generateDefaultLayoutParams());
+    }
+
+    @Override
+    public ViewGroup.LayoutParams generateLayoutParams(final AttributeSet attrs) {
+        return new LayoutParams(super.generateLayoutParams(attrs));
+    }
+
+    @Override
+    protected ViewGroup.LayoutParams generateLayoutParams(final ViewGroup.LayoutParams p) {
+        return new LayoutParams(super.generateLayoutParams(p));
+    }
+
+    @Override
+    protected void onFinishInflate() {
+        super.onFinishInflate();
+
+        bringChildToFront(mAddButton);
+        mButtonsCount = getChildCount();
+
+        if (mLabelsStyle != 0) {
+            createLabels();
+        }
+    }
+
+    private void createLabels() {
+        final Context context = new ContextThemeWrapper(getContext(), mLabelsStyle);
+
+        for (int i = 0; i < mButtonsCount; i++) {
+            final FloatingActionButton button = (FloatingActionButton) getChildAt(i);
+            final String title = button.getTitle();
+
+            if (button == mAddButton || title == null ||
+                    button.getTag(R.id.fab_label) != null) continue;
+
+            final AppCompatTextView label = new AppCompatTextView(context);
+            label.setTextAppearance(context, mLabelsStyle);
+            label.setText(button.getTitle());
+            addView(label);
+
+            button.setTag(R.id.fab_label, label);
+        }
+    }
+
+    public void collapse() {
+        collapse(false);
+    }
+
+    public void collapseImmediately() {
+        collapse(true);
+    }
+
+    private void collapse(final boolean immediately) {
+        if (mExpanded) {
+            mExpanded = false;
+            mTouchDelegateGroup.setEnabled(false);
+            mCollapseAnimation.setDuration(immediately ? 0 : ANIMATION_DURATION);
+            mCollapseAnimation.start();
+            mExpandAnimation.cancel();
+
+            if (mListener != null) {
+                mListener.onMenuCollapsed();
+            }
+        }
+    }
+
+    public void toggle() {
+        if (mExpanded) {
+            collapse();
+        } else {
+            expand();
+        }
+    }
+
+    public void expand() {
+        if (!mExpanded) {
+            mExpanded = true;
+            mTouchDelegateGroup.setEnabled(true);
+            mCollapseAnimation.cancel();
+            mExpandAnimation.start();
+
+            if (mListener != null) {
+                mListener.onMenuExpanded();
+            }
+        }
+    }
+
+    public boolean isExpanded() {
+        return mExpanded;
+    }
+
+    @Override
+    public void setEnabled(final boolean enabled) {
+        super.setEnabled(enabled);
+
+        mAddButton.setEnabled(enabled);
+    }
+
+    @Override
+    public Parcelable onSaveInstanceState() {
+        final Parcelable superState = super.onSaveInstanceState();
+        final SavedState savedState = new SavedState(superState);
+        savedState.mExpanded = mExpanded;
+
+        return savedState;
+    }
+
+    @Override
+    public void onRestoreInstanceState(final Parcelable state) {
+        if (state instanceof SavedState) {
+            final SavedState savedState = (SavedState) state;
+            mExpanded = savedState.mExpanded;
+            mTouchDelegateGroup.setEnabled(mExpanded);
+
+            if (mRotatingDrawable != null) {
+                mRotatingDrawable.setRotation(mExpanded ? EXPANDED_PLUS_ROTATION : COLLAPSED_PLUS_ROTATION);
+            }
+
+            super.onRestoreInstanceState(savedState.getSuperState());
+        } else {
+            super.onRestoreInstanceState(state);
+        }
+    }
+
+    public interface OnFloatingActionsMenuUpdateListener {
+        void onMenuExpanded();
+
+        void onMenuCollapsed();
+    }
+
+    private static class RotatingDrawable extends LayerDrawable {
+        private float mRotation;
+
+        RotatingDrawable(final Drawable drawable) {
+            super(new Drawable[]{drawable});
+        }
+
+        @SuppressWarnings("UnusedDeclaration")
+        public float getRotation() {
+            return mRotation;
+        }
+
+        @Keep
+        @SuppressWarnings("UnusedDeclaration")
+        public void setRotation(final float rotation) {
+            mRotation = rotation;
+            invalidateSelf();
+        }
+
+        @Override
+        public void draw(final Canvas canvas) {
+            canvas.save();
+            canvas.rotate(mRotation, getBounds().centerX(), getBounds().centerY());
+            super.draw(canvas);
+            canvas.restore();
+        }
+    }
+
+    public static class SavedState extends BaseSavedState {
+        public static final Creator<SavedState> CREATOR = new Creator<SavedState>() {
+
+            @Override
+            public SavedState createFromParcel(final Parcel in) {
+                return new SavedState(in);
+            }
+
+            @Override
+            public SavedState[] newArray(final int size) {
+                return new SavedState[size];
+            }
+        };
+        public boolean mExpanded;
+
+        public SavedState(final Parcelable parcel) {
+            super(parcel);
+        }
+
+        private SavedState(final Parcel in) {
+            super(in);
+            mExpanded = in.readInt() == 1;
+        }
+
+        @Override
+        public void writeToParcel(@NonNull final Parcel out, final int flags) {
+            super.writeToParcel(out, flags);
+            out.writeInt(mExpanded ? 1 : 0);
+        }
+    }
+
+    private class LayoutParams extends ViewGroup.LayoutParams {
+
+        private final ObjectAnimator mExpandDir = new ObjectAnimator();
+        private final ObjectAnimator mExpandAlpha = new ObjectAnimator();
+        private final ObjectAnimator mCollapseDir = new ObjectAnimator();
+        private final ObjectAnimator mCollapseAlpha = new ObjectAnimator();
+        private boolean animationsSetToPlay;
+
+        LayoutParams(final ViewGroup.LayoutParams source) {
+            super(source);
+
+            mExpandDir.setInterpolator(EXPAND_INTERPOLATOR);
+            mExpandAlpha.setInterpolator(ALPHA_EXPAND_INTERPOLATOR);
+            mCollapseDir.setInterpolator(COLLAPSE_INTERPOLATOR);
+            mCollapseAlpha.setInterpolator(COLLAPSE_INTERPOLATOR);
+
+            mCollapseAlpha.setProperty(View.ALPHA);
+            mCollapseAlpha.setFloatValues(1f, 0f);
+
+            mExpandAlpha.setProperty(View.ALPHA);
+            mExpandAlpha.setFloatValues(0f, 1f);
+
+            switch (mExpandDirection) {
+                case EXPAND_UP:
+                case EXPAND_DOWN:
+                    mCollapseDir.setProperty(View.TRANSLATION_Y);
+                    mExpandDir.setProperty(View.TRANSLATION_Y);
+                    break;
+                case EXPAND_LEFT:
+                case EXPAND_RIGHT:
+                    mCollapseDir.setProperty(View.TRANSLATION_X);
+                    mExpandDir.setProperty(View.TRANSLATION_X);
+                    break;
+            }
+        }
+
+        public void setAnimationsTarget(final View view) {
+            mCollapseAlpha.setTarget(view);
+            mCollapseDir.setTarget(view);
+            mExpandAlpha.setTarget(view);
+            mExpandDir.setTarget(view);
+
+            // Now that the animations have targets, set them to be played
+            if (!animationsSetToPlay) {
+                addLayerTypeListener(mExpandDir, view);
+                addLayerTypeListener(mCollapseDir, view);
+
+                mCollapseAnimation.play(mCollapseAlpha);
+                mCollapseAnimation.play(mCollapseDir);
+                mExpandAnimation.play(mExpandAlpha);
+                mExpandAnimation.play(mExpandDir);
+                animationsSetToPlay = true;
+            }
+        }
+
+        private void addLayerTypeListener(final Animator animator, final View view) {
+            animator.addListener(new AnimatorListenerAdapter() {
+                @Override
+                public void onAnimationEnd(final Animator animation) {
+                    view.setLayerType(LAYER_TYPE_NONE, null);
+                }
+
+                @Override
+                public void onAnimationStart(final Animator animation) {
+                    view.setLayerType(LAYER_TYPE_HARDWARE, null);
+                }
+            });
+        }
+    }
+}

app/src/main/java/com/wireguard/android/widget/fab/TouchDelegateGroup.java

@@ -0,0 +1,77 @@
+/*
+ * Copyright © 2014 Jerzy Chalupski
+ * Copyright © 2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+package com.wireguard.android.widget.fab;
+
+import android.graphics.Rect;
+import android.support.annotation.NonNull;
+import android.view.MotionEvent;
+import android.view.TouchDelegate;
+import android.view.View;
+
+import java.util.ArrayList;
+import java.util.Collection;
+
+public class TouchDelegateGroup extends TouchDelegate {
+    private static final Rect USELESS_HACKY_RECT = new Rect();
+    private final Collection<TouchDelegate> mTouchDelegates = new ArrayList<>();
+    private TouchDelegate mCurrentTouchDelegate;
+    private boolean mEnabled;
+
+    public TouchDelegateGroup(final View uselessHackyView) {
+        super(USELESS_HACKY_RECT, uselessHackyView);
+    }
+
+    public void addTouchDelegate(@NonNull final TouchDelegate touchDelegate) {
+        mTouchDelegates.add(touchDelegate);
+    }
+
+    public void removeTouchDelegate(final TouchDelegate touchDelegate) {
+        mTouchDelegates.remove(touchDelegate);
+        if (mCurrentTouchDelegate == touchDelegate) {
+            mCurrentTouchDelegate = null;
+        }
+    }
+
+    public void clearTouchDelegates() {
+        mTouchDelegates.clear();
+        mCurrentTouchDelegate = null;
+    }
+
+    @Override
+    public boolean onTouchEvent(@NonNull final MotionEvent event) {
+        if (!mEnabled) return false;
+
+        TouchDelegate delegate = null;
+
+        switch (event.getAction()) {
+            case MotionEvent.ACTION_DOWN:
+		for (final TouchDelegate touchDelegate : mTouchDelegates) {
+                    if (touchDelegate.onTouchEvent(event)) {
+                        mCurrentTouchDelegate = touchDelegate;
+                        return true;
+                    }
+                }
+                break;
+
+            case MotionEvent.ACTION_MOVE:
+                delegate = mCurrentTouchDelegate;
+                break;
+
+            case MotionEvent.ACTION_CANCEL:
+            case MotionEvent.ACTION_UP:
+                delegate = mCurrentTouchDelegate;
+                mCurrentTouchDelegate = null;
+                break;
+        }
+
+        return delegate != null && delegate.onTouchEvent(event);
+    }
+
+    public void setEnabled(final boolean enabled) {
+        mEnabled = enabled;
+    }
+}

app/src/main/java/com/wireguard/config/Attribute.java

@@ -8,9 +8,6 @@ package com.wireguard.config;
 
 import android.text.TextUtils;
 
-import java.lang.reflect.InvocationTargetException;
-import java.lang.reflect.Method;
-import java.net.InetAddress;
 import java.util.HashMap;
 import java.util.Locale;
 import java.util.Map;
@@ -36,7 +33,6 @@ enum Attribute {
     private static final String[] EMPTY_LIST = new String[0];
     private static final Map<String, Attribute> KEY_MAP;
     private static final Pattern LIST_SEPARATOR_PATTERN = Pattern.compile("\\s*,\\s*");
-    private static final Method NUMERIC_ADDRESS_PARSER;
     private static final Pattern SEPARATOR_PATTERN = Pattern.compile("\\s|=");
 
     static {
@@ -46,14 +42,6 @@ enum Attribute {
         }
     }
 
-    static {
-        try {
-            NUMERIC_ADDRESS_PARSER = InetAddress.class.getMethod("parseNumericAddress", String.class);
-        } catch (final Exception e) {
-            throw new RuntimeException(e);
-        }
-    }
-
     private final Pattern pattern;
     private final String token;
 
@@ -70,21 +58,6 @@ enum Attribute {
         return KEY_MAP.get(SEPARATOR_PATTERN.split(line)[0].toLowerCase());
     }
 
-    public static InetAddress parseIPString(final String address) {
-        if (address == null || address.isEmpty())
-            throw new IllegalArgumentException("Empty address");
-        try {
-            return (InetAddress) NUMERIC_ADDRESS_PARSER.invoke(null, address);
-        } catch (final IllegalAccessException e) {
-            throw new RuntimeException(e);
-        } catch (final InvocationTargetException e) {
-            if (e.getCause() instanceof IllegalArgumentException)
-                throw (IllegalArgumentException) e.getCause();
-            else
-                throw new IllegalArgumentException(e.getCause());
-        }
-    }
-
     public static String[] stringToList(final String string) {
         if (string == null)
             return EMPTY_LIST;

app/src/main/java/com/wireguard/config/IPCidr.java

@@ -1,48 +0,0 @@
-/*
- * Copyright © 2018 Samuel Holland <samuel@sholland.org>
- * Copyright © 2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
- * SPDX-License-Identifier: GPL-2.0-or-later
- */
-
-package com.wireguard.config;
-
-import java.net.Inet4Address;
-import java.net.Inet6Address;
-import java.net.InetAddress;
-import java.util.Locale;
-
-public class IPCidr {
-    private final InetAddress address;
-    private int cidr;
-
-    @SuppressWarnings("MagicNumber")
-    public IPCidr(String in) {
-        cidr = -1;
-        final int slash = in.lastIndexOf('/');
-        if (slash != -1 && slash < in.length() - 1) {
-            try {
-                cidr = Integer.parseInt(in.substring(slash + 1), 10);
-                in = in.substring(0, slash);
-            } catch (final Exception ignored) {
-            }
-        }
-        address = Attribute.parseIPString(in);
-        if ((address instanceof Inet6Address) && (cidr > 128 || cidr < 0))
-            cidr = 128;
-        else if ((address instanceof Inet4Address) && (cidr > 32 || cidr < 0))
-            cidr = 32;
-    }
-
-    public InetAddress getAddress() {
-        return address;
-    }
-
-    public int getCidr() {
-        return cidr;
-    }
-
-    @Override
-    public String toString() {
-        return String.format(Locale.getDefault(), "%s/%d", address.getHostAddress(), cidr);
-    }
-}

app/src/main/java/com/wireguard/config/InetAddresses.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright © 2018 Samuel Holland <samuel@sholland.org>
+ * Copyright © 2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+package com.wireguard.config;
+
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.net.InetAddress;
+
+public final class InetAddresses {
+    private static final Method PARSER_METHOD;
+
+    static {
+        try {
+            // This method is only present on Android.
+            PARSER_METHOD = InetAddress.class.getMethod("parseNumericAddress", String.class);
+        } catch (final NoSuchMethodException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    private InetAddresses() {
+        // Prevent instantiation.
+    }
+
+    @NonNull
+    public static InetAddress parse(@Nullable final String address) {
+        if (address == null || address.isEmpty())
+            throw new IllegalArgumentException("Empty address");
+        try {
+            return (InetAddress) PARSER_METHOD.invoke(null, address);
+        } catch (final IllegalAccessException | InvocationTargetException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}

app/src/main/java/com/wireguard/config/InetNetwork.java

@@ -0,0 +1,61 @@
+/*
+ * Copyright © 2018 Samuel Holland <samuel@sholland.org>
+ * Copyright © 2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+package com.wireguard.config;
+
+import android.support.annotation.NonNull;
+
+import java.net.Inet4Address;
+import java.net.InetAddress;
+import java.util.Objects;
+
+public class InetNetwork {
+    private final InetAddress address;
+    private final int mask;
+
+    public InetNetwork(@NonNull final String input) {
+        final int slash = input.lastIndexOf('/');
+        final int rawMask;
+        final String rawAddress;
+        if (slash >= 0) {
+            rawMask = Integer.parseInt(input.substring(slash + 1), 10);
+            rawAddress = input.substring(0, slash);
+        } else {
+            rawMask = -1;
+            rawAddress = input;
+        }
+        address = InetAddresses.parse(rawAddress);
+        final int maxMask = (address instanceof Inet4Address) ? 32 : 128;
+        mask = rawMask >= 0 && rawMask <= maxMask ? rawMask : maxMask;
+    }
+
+    @Override
+    public boolean equals(final Object obj) {
+        if (!(obj instanceof InetNetwork))
+            return false;
+        final InetNetwork other = (InetNetwork) obj;
+        return Objects.equals(address, other.address) && mask == other.mask;
+    }
+
+    @NonNull
+    public InetAddress getAddress() {
+        return address;
+    }
+
+    public int getMask() {
+        return mask;
+    }
+
+    @Override
+    public int hashCode() {
+        return address.hashCode() ^ mask;
+    }
+
+    @Override
+    public String toString() {
+        return address.getHostAddress() + '/' + mask;
+    }
+}

app/src/main/java/com/wireguard/config/Interface.java

@@ -23,7 +23,7 @@ import java.util.List;
  */
 
 public class Interface {
-    private final List<IPCidr> addressList;
+    private final List<InetNetwork> addressList;
     private final List<InetAddress> dnsList;
     private Keypair keypair;
     private int listenPort;
@@ -39,7 +39,7 @@ public class Interface {
             for (final String addr : addresses) {
                 if (addr.isEmpty())
                     throw new IllegalArgumentException("Address is empty");
-                addressList.add(new IPCidr(addr));
+                addressList.add(new InetNetwork(addr));
             }
         }
     }
@@ -47,7 +47,7 @@ public class Interface {
     private void addDnses(final String[] dnses) {
         if (dnses != null && dnses.length > 0) {
             for (final String dns : dnses) {
-                dnsList.add(Attribute.parseIPString(dns));
+                dnsList.add(InetAddresses.parse(dns));
             }
         }
     }
@@ -58,8 +58,8 @@ public class Interface {
         return Attribute.iterableToString(addressList);
     }
 
-    public IPCidr[] getAddresses() {
-        return addressList.toArray(new IPCidr[addressList.size()]);
+    public InetNetwork[] getAddresses() {
+        return addressList.toArray(new InetNetwork[addressList.size()]);
     }
 
     private String getDnsString() {

app/src/main/java/com/wireguard/config/Peer.java

@@ -28,7 +28,7 @@ import java.util.Locale;
  */
 
 public class Peer {
-    private final List<IPCidr> allowedIPsList;
+    private final List<InetNetwork> allowedIPsList;
     private InetSocketAddress endpoint;
     private int persistentKeepalive;
     private String preSharedKey;
@@ -41,13 +41,13 @@ public class Peer {
     private void addAllowedIPs(final String[] allowedIPs) {
         if (allowedIPs != null && allowedIPs.length > 0) {
             for (final String allowedIP : allowedIPs) {
-                allowedIPsList.add(new IPCidr(allowedIP));
+                allowedIPsList.add(new InetNetwork(allowedIP));
             }
         }
     }
 
-    public IPCidr[] getAllowedIPs() {
-        return allowedIPsList.toArray(new IPCidr[allowedIPsList.size()]);
+    public InetNetwork[] getAllowedIPs() {
+        return allowedIPsList.toArray(new InetNetwork[allowedIPsList.size()]);
     }
 
     private String getAllowedIPsString() {

app/src/main/java/com/wireguard/crypto/Curve25519.java

@@ -10,23 +10,23 @@ import java.util.Arrays;
 /**
  * Implementation of the Curve25519 elliptic curve algorithm.
  * <p>
+ * This implementation was imported to WireGuard from noise-java:
+ * https://github.com/rweather/noise-java
+ * <p>
  * This implementation is based on that from arduinolibs:
  * https://github.com/rweather/arduinolibs
  * <p>
- * This implementation is copied verbatim from noise-java:
- * https://github.com/rweather/noise-java
- * <p>
  * Differences in this version are due to using 26-bit limbs for the
  * representation instead of the 8/16/32-bit limbs in the original.
  * <p>
  * References: http://cr.yp.to/ecdh.html, RFC 7748
  */
-@SuppressWarnings("MagicNumber")
+@SuppressWarnings({"MagicNumber", "NonConstantFieldWithUpperCaseName", "SuspiciousNameCombination"})
 public final class Curve25519 {
-
     // Numbers modulo 2^255 - 19 are broken up into ten 26-bit words.
     private static final int NUM_LIMBS_255BIT = 10;
     private static final int NUM_LIMBS_510BIT = 20;
+
     private final int[] A;
     private final int[] AA;
     private final int[] B;
@@ -152,6 +152,38 @@ public final class Curve25519 {
         }
     }
 
+    /**
+     * Subtracts two numbers modulo 2^255 - 19.
+     *
+     * @param result The result.
+     * @param x      The first number to subtract.
+     * @param y      The second number to subtract.
+     */
+    private static void sub(final int[] result, final int[] x, final int[] y) {
+        int index;
+        int borrow;
+
+        // Subtract y from x to generate the intermediate result.
+        borrow = 0;
+        for (index = 0; index < NUM_LIMBS_255BIT; ++index) {
+            borrow = x[index] - y[index] - ((borrow >> 26) & 0x01);
+            result[index] = borrow & 0x03FFFFFF;
+        }
+
+        // If we had a borrow, then the result has gone negative and we
+        // have to add 2^255 - 19 to the result to make it positive again.
+        // The top bits of "borrow" will be all 1's if there is a borrow
+        // or it will be all 0's if there was no borrow.  Easiest is to
+        // conditionally subtract 19 and then mask off the high bits.
+        borrow = result[0] - ((-((borrow >> 26) & 0x01)) & 19);
+        result[0] = borrow & 0x03FFFFFF;
+        for (index = 1; index < NUM_LIMBS_255BIT; ++index) {
+            borrow = result[index] - ((borrow >> 26) & 0x01);
+            result[index] = borrow & 0x03FFFFFF;
+        }
+        result[NUM_LIMBS_255BIT - 1] &= 0x001FFFFF;
+    }
+
     /**
      * Adds two numbers modulo 2^255 - 19.
      *
@@ -160,8 +192,7 @@ public final class Curve25519 {
      * @param y      The second number to add.
      */
     private void add(final int[] result, final int[] x, final int[] y) {
-        int carry;
-        carry = x[0] + y[0];
+        int carry = x[0] + y[0];
         result[0] = carry & 0x03FFFFFF;
         for (int index = 1; index < NUM_LIMBS_255BIT; ++index) {
             carry = (carry >> 26) + x[index] + y[index];
@@ -200,12 +231,13 @@ public final class Curve25519 {
      */
     private void evalCurve(final byte[] s) {
         int sposn = 31;
+        int sbit = 6;
         int svalue = s[sposn] | 0x40;
         int swap = 0;
 
         // Iterate over all 255 bits of "s" from the highest to the lowest.
         // We ignore the high bit of the 256-bit representation of "s".
-        for (int sbit = 6; ; ) {
+        while (true) {
             // Conditional swaps on entry to this bit but only if we
             // didn't swap on the previous bit.
             final int select = (svalue >> sbit) & 0x01;
@@ -263,14 +295,12 @@ public final class Curve25519 {
      * @param y      The second number to multiply.
      */
     private void mul(final int[] result, final int[] x, final int[] y) {
-        int i;
-
         // Multiply the two numbers to create the intermediate result.
         long v = x[0];
-        for (i = 0; i < NUM_LIMBS_255BIT; ++i) {
+        for (int i = 0; i < NUM_LIMBS_255BIT; ++i) {
             t1[i] = v * y[i];
         }
-        for (i = 1; i < NUM_LIMBS_255BIT; ++i) {
+        for (int i = 1; i < NUM_LIMBS_255BIT; ++i) {
             v = x[i];
             for (int j = 0; j < (NUM_LIMBS_255BIT - 1); ++j) {
                 t1[i + j] += v * y[j];
@@ -281,7 +311,7 @@ public final class Curve25519 {
         // Propagate carries and convert back into 26-bit words.
         v = t1[0];
         t2[0] = ((int) v) & 0x03FFFFFF;
-        for (i = 1; i < NUM_LIMBS_510BIT; ++i) {
+        for (int i = 1; i < NUM_LIMBS_510BIT; ++i) {
             v = (v >> 26) + t1[i];
             t2[i] = ((int) v) & 0x03FFFFFF;
         }
@@ -315,8 +345,6 @@ public final class Curve25519 {
      * @param x      The argument.
      */
     private void pow250(final int[] result, final int[] x) {
-        int j;
-
         // The big-endian hexadecimal expansion of (2^250 - 1) is:
         // 03FFFFFF FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFF
         //
@@ -329,11 +357,11 @@ public final class Curve25519 {
 
         // Build a pattern of 250 bits in length of repeated copies of 0000000001.
         square(A, x);
-        for (j = 0; j < 9; ++j)
+        for (int j = 0; j < 9; ++j)
             square(A, A);
         mul(result, A, x);
         for (int i = 0; i < 23; ++i) {
-            for (j = 0; j < 10; ++j)
+            for (int j = 0; j < 10; ++j)
                 square(A, A);
             mul(result, result, A);
         }
@@ -342,7 +370,7 @@ public final class Curve25519 {
         // the result to "fill in" the gaps in the pattern.
         square(A, result);
         mul(result, result, A);
-        for (j = 0; j < 8; ++j) {
+        for (int j = 0; j < 8; ++j) {
             square(A, A);
             mul(result, result, A);
         }
@@ -381,18 +409,14 @@ public final class Curve25519 {
      * @param size   The number of limbs in the high order half of x.
      */
     private void reduce(final int[] result, final int[] x, final int size) {
-        int index;
-        int limb;
-        int carry;
-
         // Calculate (x mod 2^255) + ((x / 2^255) * 19) which will
         // either produce the answer we want or it will produce a
         // value of the form "answer + j * (2^255 - 19)".  There are
         // 5 left-over bits in the top-most limb of the bottom half.
-        carry = 0;
-        limb = x[NUM_LIMBS_255BIT - 1] >> 21;
+        int carry = 0;
+        int limb = x[NUM_LIMBS_255BIT - 1] >> 21;
         x[NUM_LIMBS_255BIT - 1] &= 0x001FFFFF;
-        for (index = 0; index < size; ++index) {
+        for (int index = 0; index < size; ++index) {
             limb += x[NUM_LIMBS_255BIT + index] << 5;
             carry += (limb & 0x03FFFFFF) * 19 + x[index];
             x[index] = carry & 0x03FFFFFF;
@@ -402,7 +426,7 @@ public final class Curve25519 {
         if (size < NUM_LIMBS_255BIT) {
             // The high order half of the number is short; e.g. for mulA24().
             // Propagate the carry through the rest of the low order part.
-            for (index = size; index < NUM_LIMBS_255BIT; ++index) {
+            for (int index = size; index < NUM_LIMBS_255BIT; ++index) {
                 carry += x[index];
                 x[index] = carry & 0x03FFFFFF;
                 carry >>= 26;
@@ -417,7 +441,7 @@ public final class Curve25519 {
         // top 5 bits of the highest limb of the bottom half.
         carry = (x[NUM_LIMBS_255BIT - 1] >> 21) * 19;
         x[NUM_LIMBS_255BIT - 1] &= 0x001FFFFF;
-        for (index = 0; index < NUM_LIMBS_255BIT; ++index) {
+        for (int index = 0; index < NUM_LIMBS_255BIT; ++index) {
             carry += x[index];
             result[index] = carry & 0x03FFFFFF;
             carry >>= 26;
@@ -436,14 +460,11 @@ public final class Curve25519 {
      * @param x The number to reduce, and the result.
      */
     private void reduceQuick(final int[] x) {
-        int index;
-        int carry;
-
         // Perform a trial subtraction of (2^255 - 19) from "x" which is
         // equivalent to adding 19 and subtracting 2^255.  We add 19 here;
         // the subtraction of 2^255 occurs in the next step.
-        carry = 19;
-        for (index = 0; index < NUM_LIMBS_255BIT; ++index) {
+        int carry = 19;
+        for (int index = 0; index < NUM_LIMBS_255BIT; ++index) {
             carry += x[index];
             t2[index] = carry & 0x03FFFFFF;
             carry >>= 26;
@@ -457,7 +478,7 @@ public final class Curve25519 {
         final int mask = -((t2[NUM_LIMBS_255BIT - 1] >> 21) & 0x01);
         final int nmask = ~mask;
         t2[NUM_LIMBS_255BIT - 1] &= 0x001FFFFF;
-        for (index = 0; index < NUM_LIMBS_255BIT; ++index)
+        for (int index = 0; index < NUM_LIMBS_255BIT; ++index)
             x[index] = (x[index] & nmask) | (t2[index] & mask);
     }
 
@@ -470,36 +491,4 @@ public final class Curve25519 {
     private void square(final int[] result, final int[] x) {
         mul(result, x, x);
     }
-
-    /**
-     * Subtracts two numbers modulo 2^255 - 19.
-     *
-     * @param result The result.
-     * @param x      The first number to subtract.
-     * @param y      The second number to subtract.
-     */
-    private static void sub(final int[] result, final int[] x, final int[] y) {
-        int index;
-        int borrow;
-
-        // Subtract y from x to generate the intermediate result.
-        borrow = 0;
-        for (index = 0; index < NUM_LIMBS_255BIT; ++index) {
-            borrow = x[index] - y[index] - ((borrow >> 26) & 0x01);
-            result[index] = borrow & 0x03FFFFFF;
-        }
-
-        // If we had a borrow, then the result has gone negative and we
-        // have to add 2^255 - 19 to the result to make it positive again.
-        // The top bits of "borrow" will be all 1's if there is a borrow
-        // or it will be all 0's if there was no borrow.  Easiest is to
-        // conditionally subtract 19 and then mask off the high bits.
-        borrow = result[0] - ((-((borrow >> 26) & 0x01)) & 19);
-        result[0] = borrow & 0x03FFFFFF;
-        for (index = 1; index < NUM_LIMBS_255BIT; ++index) {
-            borrow = result[index] - ((borrow >> 26) & 0x01);
-            result[index] = borrow & 0x03FFFFFF;
-        }
-        result[NUM_LIMBS_255BIT - 1] &= 0x001FFFFF;
-    }
 }

app/src/main/java/com/wireguard/crypto/KeyEncoding.java

@@ -25,10 +25,10 @@ public final class KeyEncoding {
         // Prevent instantiation.
     }
 
-    private static int decodeBase64(final char[] src, final int src_offset) {
+    private static int decodeBase64(final char[] src, final int srcOffset) {
         int val = 0;
         for (int i = 0; i < 4; ++i) {
-            final char c = src[i + src_offset];
+            final char c = src[i + srcOffset];
             val |= (-1
                     + ((((('A' - 1) - c) & (c - ('Z' + 1))) >>> 8) & (c - 64))
                     + ((((('a' - 1) - c) & (c - ('z' + 1))) >>> 8) & (c - 70))
@@ -40,16 +40,16 @@ public final class KeyEncoding {
         return val;
     }
 
-    private static void encodeBase64(final byte[] src, final int src_offset,
-                                     final char[] dest, final int dest_offset) {
+    private static void encodeBase64(final byte[] src, final int srcOffset,
+                                     final char[] dest, final int destOffset) {
         final byte[] input = {
-                (byte) ((src[src_offset] >>> 2) & 63),
-                (byte) ((src[src_offset] << 4 | ((src[1 + src_offset] & 0xff) >>> 4)) & 63),
-                (byte) ((src[1 + src_offset] << 2 | ((src[2 + src_offset] & 0xff) >>> 6)) & 63),
-                (byte) ((src[2 + src_offset]) & 63),
+                (byte) ((src[srcOffset] >>> 2) & 63),
+                (byte) ((src[srcOffset] << 4 | ((src[1 + srcOffset] & 0xff) >>> 4)) & 63),
+                (byte) ((src[1 + srcOffset] << 2 | ((src[2 + srcOffset] & 0xff) >>> 6)) & 63),
+                (byte) ((src[2 + srcOffset]) & 63),
         };
         for (int i = 0; i < 4; ++i) {
-            dest[i + dest_offset] = (char) (input[i] + 'A'
+            dest[i + destOffset] = (char) (input[i] + 'A'
                     + (((25 - input[i]) >>> 8) & 6)
                     - (((51 - input[i]) >>> 8) & 75)
                     - (((61 - input[i]) >>> 8) & 15)
@@ -63,10 +63,10 @@ public final class KeyEncoding {
         if (input.length != KEY_LENGTH_BASE64 || input[KEY_LENGTH_BASE64 - 1] != '=')
             throw new IllegalArgumentException(KEY_LENGTH_BASE64_EXCEPTION_MESSAGE);
         int i;
+        int ret = 0;
         for (i = 0; i < KEY_LENGTH / 3; ++i) {
             final int val = decodeBase64(input, i * 4);
-            if (val < 0)
-                throw new IllegalArgumentException(KEY_LENGTH_BASE64_EXCEPTION_MESSAGE);
+            ret |= val >>> 31;
             key[i * 3] = (byte) ((val >>> 16) & 0xff);
             key[i * 3 + 1] = (byte) ((val >>> 8) & 0xff);
             key[i * 3 + 2] = (byte) (val & 0xff);
@@ -78,10 +78,12 @@ public final class KeyEncoding {
                 'A',
         };
         final int val = decodeBase64(endSegment, 0);
-        if (val < 0 || (val & 0xff) != 0)
-            throw new IllegalArgumentException(KEY_LENGTH_BASE64_EXCEPTION_MESSAGE);
+        ret |= (val >>> 31) | (val & 0xff);
         key[i * 3] = (byte) ((val >>> 16) & 0xff);
         key[i * 3 + 1] = (byte) ((val >>> 8) & 0xff);
+
+        if (ret != 0)
+            throw new IllegalArgumentException(KEY_LENGTH_BASE64_EXCEPTION_MESSAGE);
         return key;
     }
 
@@ -90,25 +92,37 @@ public final class KeyEncoding {
         final byte[] key = new byte[KEY_LENGTH];
         if (input.length != KEY_LENGTH_HEX)
             throw new IllegalArgumentException(KEY_LENGTH_HEX_EXCEPTION_MESSAGE);
+        int ret = 0;
 
-        int c_acc = 0;
-        int state = 0;
+        for (int i = 0; i < KEY_LENGTH_HEX; i += 2) {
+            int c;
+            int cNum;
+            int cNum0;
+            int cAlpha;
+            int cAlpha0;
+            int cVal;
+            final int cAcc;
 
-        for (int i = 0; i < KEY_LENGTH_HEX; ++i) {
-            final int c = input[i];
-            final int c_num = c ^ 48;
-            final int c_num0 = (c_num - 10) >> 8;
-            final int c_alpha = (c & ~32) - 55;
-            final int c_alpha0 = ((c_alpha - 10) ^ (c_alpha - 16)) >> 8;
-            if ((c_num0 | c_alpha0) == 0)
-                throw new IllegalArgumentException(KEY_LENGTH_HEX_EXCEPTION_MESSAGE);
-            final int c_val = (c_num0 & c_num) | (c_alpha0 & c_alpha);
-            if (state == 0)
-                c_acc = c_val * 16;
-            else
-                key[i / 2] = (byte) (c_acc | c_val);
-            state = ~state;
+            c = input[i];
+            cNum = c ^ 48;
+            cNum0 = ((cNum - 10) >>> 8) & 0xff;
+            cAlpha = (c & ~32) - 55;
+            cAlpha0 = (((cAlpha - 10) ^ (cAlpha - 16)) >>> 8) & 0xff;
+            ret |= ((cNum0 | cAlpha0) - 1) >>> 8;
+            cVal = (cNum0 & cNum) | (cAlpha0 & cAlpha);
+            cAcc = cVal * 16;
+
+            c = input[i + 1];
+            cNum = c ^ 48;
+            cNum0 = ((cNum - 10) >>> 8) & 0xff;
+            cAlpha = (c & ~32) - 55;
+            cAlpha0 = (((cAlpha - 10) ^ (cAlpha - 16)) >>> 8) & 0xff;
+            ret |= ((cNum0 | cAlpha0) - 1) >>> 8;
+            cVal = (cNum0 & cNum) | (cAlpha0 & cAlpha);
+            key[i / 2] = (byte) (cAcc | cVal);
         }
+        if (ret != 0)
+            throw new IllegalArgumentException(KEY_LENGTH_HEX_EXCEPTION_MESSAGE);
         return key;
     }
 

app/src/main/java/com/wireguard/util/Keyed.java

@@ -1,10 +1,9 @@
 /*
  * Copyright © 2018 Samuel Holland <samuel@sholland.org>
- * Copyright © 2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
  * SPDX-License-Identifier: GPL-2.0-or-later
  */
 
-package com.wireguard.android.util;
+package com.wireguard.util;
 
 /**
  * Interface for objects that have a identifying key of the given type.

app/src/main/java/com/wireguard/util/KeyedList.java

@@ -1,10 +1,9 @@
 /*
  * Copyright © 2018 Samuel Holland <samuel@sholland.org>
- * Copyright © 2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
  * SPDX-License-Identifier: GPL-2.0-or-later
  */
 
-package com.wireguard.android.util;
+package com.wireguard.util;
 
 import java.util.Collection;
 import java.util.List;

app/src/main/java/com/wireguard/util/SortedKeyedList.java

@@ -1,10 +1,9 @@
 /*
  * Copyright © 2018 Samuel Holland <samuel@sholland.org>
- * Copyright © 2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
  * SPDX-License-Identifier: GPL-2.0-or-later
  */
 
-package com.wireguard.android.util;
+package com.wireguard.util;
 
 import java.util.Collection;
 import java.util.Comparator;

app/src/main/res/drawable/fab_label_background.xml

@@ -6,5 +6,5 @@
         android:left="8dp"
         android:right="8dp"
         android:top="4dp" />
-    <solid android:color="?android:attr/colorPrimary" />
+    <solid android:color="@color/fab_label_background_color" />
 </shape>

app/src/main/res/drawable/ic_action_delete.xml

@@ -4,6 +4,6 @@
     android:viewportHeight="24"
     android:viewportWidth="24">
     <path
-        android:fillColor="#FFFFFF"
+        android:fillColor="?android:attr/colorForeground"
         android:pathData="M6,19c0,1.1 0.9,2 2,2h8c1.1,0 2,-0.9 2,-2V7H6v12zM19,4h-3.5l-1,-1h-5l-1,1H5v2h14V4z" />
 </vector>

app/src/main/res/drawable/ic_action_delete_black.xml

@@ -1,9 +0,0 @@
-<vector xmlns:android="http://schemas.android.com/apk/res/android"
-    android:width="24dp"
-    android:height="24dp"
-    android:viewportHeight="24"
-    android:viewportWidth="24">
-    <path
-        android:fillColor="#000000"
-        android:pathData="M6,19c0,1.1 0.9,2 2,2h8c1.1,0 2,-0.9 2,-2V7H6v12zM19,4h-3.5l-1,-1h-5l-1,1H5v2h14V4z" />
-</vector>

app/src/main/res/drawable/ic_action_edit.xml

@@ -4,6 +4,6 @@
     android:viewportHeight="24"
     android:viewportWidth="24">
     <path
-        android:fillColor="#FFFFFF"
+        android:fillColor="?android:attr/colorForeground"
         android:pathData="M3,17.25V21h3.75L17.81,9.94l-3.75,-3.75L3,17.25zM20.71,7.04c0.39,-0.39 0.39,-1.02 0,-1.41l-2.34,-2.34c-0.39,-0.39 -1.02,-0.39 -1.41,0l-1.83,1.83 3.75,3.75 1.83,-1.83z" />
 </vector>

app/src/main/res/drawable/ic_action_edit_inverse.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportHeight="24"
+    android:viewportWidth="24">
+    <path
+        android:fillColor="?android:attr/colorBackground"
+        android:pathData="M3,17.25V21h3.75L17.81,9.94l-3.75,-3.75L3,17.25zM20.71,7.04c0.39,-0.39 0.39,-1.02 0,-1.41l-2.34,-2.34c-0.39,-0.39 -1.02,-0.39 -1.41,0l-1.83,1.83 3.75,3.75 1.83,-1.83z" />
+</vector>

app/src/main/res/drawable/ic_action_open.xml

@@ -4,6 +4,6 @@
     android:viewportHeight="24"
     android:viewportWidth="24">
     <path
-        android:fillColor="#FFFFFF"
+        android:fillColor="?android:attr/colorForeground"
         android:pathData="M6,2c-1.1,0 -1.99,0.9 -1.99,2L4,20c0,1.1 0.89,2 1.99,2L18,22c1.1,0 2,-0.9 2,-2L20,8l-6,-6L6,2zM13,9L13,3.5L18.5,9L13,9z" />
 </vector>

app/src/main/res/drawable/ic_action_open_inverse.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportHeight="24"
+    android:viewportWidth="24">
+    <path
+        android:fillColor="?android:attr/colorBackground"
+        android:pathData="M6,2c-1.1,0 -1.99,0.9 -1.99,2L4,20c0,1.1 0.89,2 1.99,2L18,22c1.1,0 2,-0.9 2,-2L20,8l-6,-6L6,2zM13,9L13,3.5L18.5,9L13,9z" />
+</vector>

app/src/main/res/drawable/ic_action_save.xml

@@ -5,6 +5,6 @@
     android:viewportHeight="24"
     android:viewportWidth="24">
     <path
-        android:fillColor="#FFFFFF"
+        android:fillColor="?android:attr/colorForeground"
         android:pathData="M17,3L5,3c-1.11,0 -2,0.9 -2,2v14c0,1.1 0.89,2 2,2h14c1.1,0 2,-0.9 2,-2L21,7l-4,-4zM12,19c-1.66,0 -3,-1.34 -3,-3s1.34,-3 3,-3 3,1.34 3,3 -1.34,3 -3,3zM15,9L5,9L5,5h10v4z" />
 </vector>

app/src/main/res/drawable/ic_settings.xml

@@ -4,6 +4,6 @@
     android:viewportHeight="24"
     android:viewportWidth="24">
     <path
-        android:fillColor="#FFFFFF"
-        android:pathData="M19.43,12.98c0.04,-0.32 0.07,-0.64 0.07,-0.98s-0.03,-0.66 -0.07,-0.98l2.11,-1.65c0.19,-0.15 0.24,-0.42 0.12,-0.64l-2,-3.46c-0.12,-0.22 -0.39,-0.3 -0.61,-0.22l-2.49,1c-0.52,-0.4 -1.08,-0.73 -1.69,-0.98l-0.38,-2.65C14.46,2.18 14.25,2 14,2h-4c-0.25,0 -0.46,0.18 -0.49,0.42l-0.38,2.65c-0.61,0.25 -1.17,0.59 -1.69,0.98l-2.49,-1c-0.23,-0.09 -0.49,0 -0.61,0.22l-2,3.46c-0.13,0.22 -0.07,0.49 0.12,0.64l2.11,1.65c-0.04,0.32 -0.07,0.65 -0.07,0.98s0.03,0.66 0.07,0.98l-2.11,1.65c-0.19,0.15 -0.24,0.42 -0.12,0.64l2,3.46c0.12,0.22 0.39,0.3 0.61,0.22l2.49,-1c0.52,0.4 1.08,0.73 1.69,0.98l0.38,2.65c0.03,0.24 0.24,0.42 0.49,0.42h4c0.25,0 0.46,-0.18 0.49,-0.42l0.38,-2.65c0.61,-0.25 1.17,-0.59 1.69,-0.98l2.49,1c0.23,0.09 0.49,0 0.61,-0.22l2,-3.46c0.12,-0.22 0.07,-0.49 -0.12,-0.64l-2.11,-1.65zM12,15.5c-1.93,0 -3.5,-1.57 -3.5,-3.5s1.57,-3.5 3.5,-3.5 3.5,1.57 3.5,3.5 -1.57,3.5 -3.5,3.5z" />
+        android:fillColor="?android:attr/colorForeground"
+        android:pathData="M12,8c1.1,0 2,-0.9 2,-2s-0.9,-2 -2,-2 -2,0.9 -2,2 0.9,2 2,2zM12,10c-1.1,0 -2,0.9 -2,2s0.9,2 2,2 2,-0.9 2,-2 -0.9,-2 -2,-2zM12,16c-1.1,0 -2,0.9 -2,2s0.9,2 2,2 2,-0.9 2,-2 -0.9,-2 -2,-2z"/>
 </vector>

app/src/main/res/drawable/list_item_background.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <selector xmlns:android="http://schemas.android.com/apk/res/android">
-    <item android:drawable="@color/list_item_activated" android:state_activated="true" />
-    <item android:drawable="@android:color/transparent" />
+    <item android:drawable="@color/list_item_activated" android:state_activated="true" /> <!-- TODO(msf): themeify this -->
+    <item android:drawable="@android:color/transparent" /> <!-- TODO(msf): themeify this -->
 </selector>

app/src/main/res/drawable/list_item_background_anim.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <ripple xmlns:android="http://schemas.android.com/apk/res/android"
-    android:color="@color/list_item_ripple">
+    android:color="@color/list_item_ripple"> <!-- TODO(msf): themeify this -->
     <item android:drawable="@drawable/list_item_background" />
 </ripple>

app/src/main/res/layout/tunnel_editor_peer.xml

@@ -51,7 +51,7 @@
                 android:background="@null"
                 android:contentDescription="@string/delete"
                 android:onClick="@{() -> collection.remove(item)}"
-                android:src="@drawable/ic_action_delete_black" />
+                android:src="@drawable/ic_action_delete" />
 
             <TextView
                 android:id="@+id/public_key_label"

app/src/main/res/layout/tunnel_list_fragment.xml

@@ -29,7 +29,7 @@
             app:items="@{tunnels}"
             app:layout="@{@layout/tunnel_list_item}" />
 
-        <com.getbase.floatingactionbutton.FloatingActionsMenu
+        <com.wireguard.android.widget.fab.FloatingActionsMenu
             android:id="@+id/create_menu"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
@@ -39,23 +39,23 @@
             app:fab_labelsPosition="left"
             app:layout_dodgeInsetEdges="bottom">
 
-            <com.getbase.floatingactionbutton.FloatingActionButton
+            <com.wireguard.android.widget.fab.FloatingActionButton
                 android:id="@+id/create_empty"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:onClick="@{fragment::onRequestCreateConfig}"
-                app:fab_icon="@drawable/ic_action_edit"
+                app:fab_icon="@drawable/ic_action_edit_inverse"
                 app:fab_size="mini"
                 app:fab_title="@string/create_empty" />
 
-            <com.getbase.floatingactionbutton.FloatingActionButton
+            <com.wireguard.android.widget.fab.FloatingActionButton
                 android:id="@+id/create_from_file"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:onClick="@{fragment::onRequestImportConfig}"
-                app:fab_icon="@drawable/ic_action_open"
+                app:fab_icon="@drawable/ic_action_open_inverse"
                 app:fab_size="mini"
                 app:fab_title="@string/create_from_file" />
-        </com.getbase.floatingactionbutton.FloatingActionsMenu>
+        </com.wireguard.android.widget.fab.FloatingActionsMenu>
     </android.support.design.widget.CoordinatorLayout>
 </layout>

app/src/main/res/menu/main_activity.xml

@@ -6,5 +6,6 @@
         android:alphabeticShortcut="s"
         android:icon="@drawable/ic_settings"
         android:title="@string/settings"
-        app:showAsAction="never" />
+        app:showAsAction="always"
+        android:orderInCategory="1000" />
 </menu>

app/src/main/res/values-night/colors.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- TODO(msf): remove these 4 hard-coded colors and replace with theme colors -->
+    <color name="list_item_activated">#64cfd8dc</color>
+    <color name="list_item_ripple">#a0808e95</color>
+    <color name="fab_label_text_color">#000000</color>
+    <color name="fab_label_background_color">#bbbbbb</color>
+
+    <color name="accent">#BBDEFB</color>
+</resources>

app/src/main/res/values/colors.xml

@@ -1,5 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
+    <!-- TODO(msf): remove these 4 hard-coded colors and replace with theme colors -->
     <color name="list_item_activated">#cfd8dc</color> <!-- Blue Grey 200 -->
     <color name="list_item_ripple">#808e95</color> <!-- Blue Grey 200 dark -->
+    <color name="fab_label_text_color">#ffffff</color>
+    <color name="fab_label_background_color">#444444</color>
+
+    <color name="accent">#2196F3</color>
 </resources>

app/src/main/res/values/fab.xml

@@ -0,0 +1,58 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <item name="fab_expand_menu_button" type="id"/>
+    <item name="fab_label" type="id"/>
+
+    <dimen name="fab_size_normal">56dp</dimen>
+    <dimen name="fab_size_mini">40dp</dimen>
+
+    <dimen name="fab_icon_size">24dp</dimen>
+
+    <dimen name="fab_plus_icon_size">14dp</dimen>
+    <dimen name="fab_plus_icon_stroke">2dp</dimen>
+
+    <dimen name="fab_shadow_offset">3dp</dimen>
+    <dimen name="fab_shadow_radius">9dp</dimen>
+
+    <dimen name="fab_stroke_width">1dp</dimen>
+
+    <dimen name="fab_actions_spacing">16dp</dimen>
+    <dimen name="fab_labels_margin">8dp</dimen>
+
+    <declare-styleable name="FloatingActionButton">
+        <attr name="fab_colorPressed" format="color"/>
+        <attr name="fab_colorDisabled" format="color"/>
+        <attr name="fab_colorNormal" format="color"/>
+        <attr name="fab_icon" format="reference"/>
+        <attr name="fab_size" format="enum">
+            <enum name="normal" value="0"/>
+            <enum name="mini" value="1"/>
+        </attr>
+        <attr name="fab_title" format="string"/>
+        <attr name="fab_stroke_visible" format="boolean"/>
+    </declare-styleable>
+    <declare-styleable name="AddFloatingActionButton">
+        <attr name="fab_plusIconColor" format="color"/>
+    </declare-styleable>
+    <declare-styleable name="FloatingActionsMenu">
+        <attr name="fab_addButtonColorPressed" format="color"/>
+        <attr name="fab_addButtonColorNormal" format="color"/>
+        <attr name="fab_addButtonSize" format="enum">
+            <enum name="normal" value="0"/>
+            <enum name="mini" value="1"/>
+        </attr>
+        <attr name="fab_addButtonPlusIconColor" format="color"/>
+        <attr name="fab_addButtonStrokeVisible" format="boolean"/>
+        <attr name="fab_labelStyle" format="reference"/>
+        <attr name="fab_labelsPosition" format="enum">
+            <enum name="left" value="0"/>
+            <enum name="right" value="1"/>
+        </attr>
+        <attr name="fab_expandDirection" format="enum">
+            <enum name="up" value="0"/>
+            <enum name="down" value="1"/>
+            <enum name="left" value="2"/>
+            <enum name="right" value="3"/>
+        </attr>
+    </declare-styleable>
+</resources>

app/src/main/res/values/strings.xml

@@ -29,6 +29,9 @@
     <string name="create_activity_title">Create WireGuard Tunnel</string>
     <string name="create_empty">Create from scratch</string>
     <string name="create_from_file">Create from file or archive</string>
+    <string name="dark_theme_title">Use dark theme</string>
+    <string name="dark_theme_summary_on">Currently using dark night theme</string>
+    <string name="dark_theme_summary_off">Currently using light day theme</string>
     <string name="delete">Delete</string>
     <string name="dns_servers">DNS servers</string>
     <string name="edit">Edit</string>
@@ -36,9 +39,6 @@
     <string name="error_down">Error bringing down tunnel: %s</string>
     <string name="error_root">Please obtain root access and try again</string>
     <string name="error_up">Error bringing up tunnel: %s</string>
-    <string name="export_error">Unable to export tunnels: %s</string>
-    <string name="export_success">Saved to %s</string>
-    <string name="export_summary">Zip file will be saved to downloads folder</string>
     <string name="generate">Generate</string>
     <string name="hint_automatic">(auto)</string>
     <string name="hint_generated">(generated)</string>
@@ -48,9 +48,15 @@
     <string name="import_success">Imported “%s”</string>
     <string name="interface_title">Interface</string>
     <string name="listen_port">Listen port</string>
+    <string name="log_exporter_title">Export log file</string>
+    <string name="log_export_error">Unable to export log: %s</string>
+    <string name="log_export_success">Saved to %s</string>
+    <string name="log_export_summary">Log file will be saved to downloads folder</string>
     <string name="mtu">MTU</string>
     <string name="name">Name</string>
     <string name="peer">Peer</string>
+    <string name="permission_label">control WireGuard tunnels</string>
+    <string name="permission_description">Allows an app to control WireGuard tunnels. Apps with this permission may enable and disable WireGuard tunnels at will, potentially misdirecting Internet traffic.</string>
     <string name="persistent_keepalive">Persistent keepalive</string>
     <string name="pre_shared_key">Pre-shared key</string>
     <string name="private_key">Private key</string>
@@ -63,13 +69,23 @@
     <string name="toggle_error">Error toggling WireGuard tunnel: %s</string>
     <string name="tools_installer_already">wg and wg-quick are already installed</string>
     <string name="tools_installer_failure">Unable to install command-line tools (no root?)</string>
-    <string name="tools_installer_initial">Install optional tools for scripting into the system partition</string>
-    <string name="tools_installer_success">wg and wg-quick installed into the system partition</string>
+    <string name="tools_installer_initial">Install optional tools for scripting</string>
+    <string name="tools_installer_working">Installing wg and wg-quick</string>
+    <string name="tools_installer_initial_system">Install optional tools for scripting into the system partition</string>
+    <string name="tools_installer_initial_magisk">Install optional tools for scripting as Magisk module</string>
+    <string name="tools_installer_success_system">wg and wg-quick installed into the system partition</string>
+    <string name="tools_installer_success_magisk">wg and wg-quick installed as a Magisk module (reboot required)</string>
     <string name="tools_installer_title">Install command line tools</string>
-    <string name="tools_installer_working">Installing wg and wg-quick into the system partition</string>
     <string name="tunnel_create_error">Unable to create tunnel: %s</string>
     <string name="tunnel_create_success">Successfully created tunnel “%s”</string>
     <string name="tunnel_rename_error">Unable to rename tunnel: %s</string>
     <string name="tunnel_rename_success">Successfully renamed tunnel to “%s”</string>
+    <string name="version_title">WireGuard for Android v%s"</string>
+    <string name="version_summary">%s backend v%s</string>
+    <string name="version_summary_checking">Checking %s backend version</string>
+    <string name="version_summary_unknown">Unknown %s version</string>
     <string name="zip_exporter_title">Export tunnels to zip file</string>
+    <string name="zip_export_error">Unable to export tunnels: %s</string>
+    <string name="zip_export_success">Saved to %s</string>
+    <string name="zip_export_summary">Zip file will be saved to downloads folder</string>
 </resources>

app/src/main/res/values/styles.xml

@@ -1,14 +1,17 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources xmlns:android="http://schemas.android.com/apk/res/android">
 
-    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar" />
+    <style name="AppTheme" parent="Theme.AppCompat.DayNight.DarkActionBar">
+        <item name="colorAccent">@color/accent</item>
+    </style>
 
     <style name="SettingsTheme" parent="AppTheme">
         <item name="preferenceTheme">@style/PreferenceThemeOverlay.v14.Material</item>
     </style>
 
-    <style name="fab_label" parent="android:TextAppearance.DeviceDefault.Inverse">
+    <style name="fab_label" parent="TextAppearance.AppCompat.Inverse">
         <item name="android:background">@drawable/fab_label_background</item>
+        <item name="android:textColor">@color/fab_label_text_color</item>
     </style>
 
 </resources>

app/src/main/res/xml/preferences.xml

@@ -1,10 +1,18 @@
 <?xml version="1.0" encoding="utf-8"?>
 <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
+    <com.wireguard.android.preference.VersionPreference android:icon="@mipmap/ic_launcher" />
     <CheckBoxPreference
         android:defaultValue="false"
         android:key="restore_on_boot"
         android:summary="@string/restore_on_boot_summary"
         android:title="@string/restore_on_boot_title" />
     <com.wireguard.android.preference.ToolsInstallerPreference android:key="tools_installer" />
-    <com.wireguard.android.preference.ZipExporterPreference android:key="zip_exporter" />
+    <com.wireguard.android.preference.ZipExporterPreference />
+    <com.wireguard.android.preference.LogExporterPreference />
+    <CheckBoxPreference
+        android:defaultValue="false"
+        android:key="dark_theme"
+        android:summaryOn="@string/dark_theme_summary_on"
+        android:summaryOff="@string/dark_theme_summary_off"
+        android:title="@string/dark_theme_title" />
 </PreferenceScreen>

app/tools/libwg-go/Makefile

@@ -29,7 +29,7 @@ GOBUILDVERSION_NEEDED := go version go$(GOBUILDVERSION) $(GOBUILDOS)/$(GOBUILDAR
 
 GOBUILDVERSION_CURRENT := $(shell go version 2>/dev/null)
 ifeq ($(GOBUILDVERSION_NEEDED),$(GOBUILDVERSION_CURRENT))
-$(info Using system go)
+$(info Using system Go)
 else
 export GOROOT := $(CURDIR)/goroot
 export PATH := $(GOROOT)/bin:$(PATH)
@@ -41,18 +41,18 @@ $(GOROOT)/bin/go:
 	rm -rf "$(GOROOT)"
 	mkdir -p "$(GOROOT)"
 	curl "$(GOBUILDTARBALL)" | tar -C "$(GOROOT)" --strip-components=1 -xzf - || { rm -rf "$(GOROOT)"; exit 1; }
-	patch -p1 -f -N -r- -d"$(GOROOT)" < goruntime-boottime-over-monotonic.diff || { rm -rf "$(GOROOT)"; exit 1; }
+	patch -p1 -f -N -r- -d "$(GOROOT)" < goruntime-boottime-over-monotonic.diff || { rm -rf "$(GOROOT)"; exit 1; }
 $(DESTDIR)/libwg-go.so: $(GOROOT)/bin/go
 endif
 
 $(shell test "$$(cat .gobuildversion 2>/dev/null)" = "$(GOBUILDVERSION_CURRENT)" || rm -f "$(DESTDIR)/libwg-go.so")
 
 $(DESTDIR)/libwg-go.so: $(FILES) src/git.zx2c4.com/wireguard-go/api-android.go src/git.zx2c4.com/wireguard-go/tun/api-android.go src/git.zx2c4.com/wireguard-go/jni.c
+	@goroot="$$(go env GOROOT)" || exit 1; patch -p1 -f -R -s --dry-run -d "$$goroot" < goruntime-boottime-over-monotonic.diff >/dev/null 2>&1 || { echo "ERROR: Your system's Go is not patched to use the suspend-aware monotonic clock. Please try again after having run: \`patch -p1 -d \"$$goroot\" < \"$(CURDIR)/goruntime-boottime-over-monotonic.diff\"\`."; exit 1; }
 	find . -name '*.go' -type l -delete
 	find . -type d -empty -delete
 	mkdir -p $(subst ../wireguard-go/,./src/git.zx2c4.com/wireguard-go/,$(dir $(FILES)))
 	$(foreach FILE,$(FILES),ln -sfrt $(subst ../wireguard-go/,./src/git.zx2c4.com/wireguard-go/,$(dir $(FILE))) $(FILE);)
-	patch -p1 -f -R -s --dry-run -d"$$(go env GOROOT)" < goruntime-boottime-over-monotonic.diff
 	GOPATH=$(PWD) go get -v -d git.zx2c4.com/wireguard-go
 	GOPATH=$(PWD) go build -v -o $(DESTDIR)/libwg-go.so -buildmode c-shared git.zx2c4.com/wireguard-go
 	go version > .gobuildversion

app/tools/libwg-go/src/git.zx2c4.com/wireguard-go/api-android.go

@@ -36,6 +36,7 @@ func (l AndroidLogger) Write(p []byte) (int, error) {
 var tunnelHandles map[int32]*Device
 
 func init() {
+	roamingDisabled = true
 	tunnelHandles = make(map[int32]*Device)
 	signals := make(chan os.Signal)
 	signal.Notify(signals, unix.SIGUSR2)
@@ -85,7 +86,6 @@ func wgTurnOn(ifnameRef string, tun_fd int32, settings string) int32 {
 	}
 
 	device.Up()
-	device.net.bind.(*NativeBind).clearSourceOnAllRouteChanges = true
 	logger.Info.Println("Device started")
 
 	var i int32
@@ -122,7 +122,18 @@ func wgGetSocketV4(tunnelHandle int32) int32 {
 	if !ok {
 		return -1
 	}
-	return int32(native.sock4)
+	fd := int32(-1)
+	conn, err := native.ipv4.SyscallConn()
+	if err != nil {
+		return -1
+	}
+	err = conn.Control(func(f uintptr) {
+		fd = int32(f)
+	})
+	if err != nil {
+		return -1
+	}
+	return fd
 }
 
 //export wgGetSocketV6
@@ -135,41 +146,23 @@ func wgGetSocketV6(tunnelHandle int32) int32 {
 	if !ok {
 		return -1
 	}
-	return int32(native.sock6)
+	fd := int32(-1)
+	conn, err := native.ipv6.SyscallConn()
+	if err != nil {
+		return -1
+	}
+	err = conn.Control(func(f uintptr) {
+		fd = int32(f)
+	})
+	if err != nil {
+		return -1
+	}
+	return fd
 }
 
-//export wgPutSocketV4
-func wgPutSocketV4(tunnelHandle int32) {
-	device, ok := tunnelHandles[tunnelHandle]
-	if !ok {
-		return
-	}
-	native, ok := device.net.bind.(*NativeBind)
-	if !ok {
-		return
-	}
-	fwmark, err := unix.GetsockoptInt(native.sock6, unix.SOL_SOCKET, unix.SO_MARK)
-	if err == nil {
-		native.lastMark = uint32(fwmark)
-		device.net.fwmark = uint32(fwmark)
-	}
-}
-
-//export wgPutSocketV6
-func wgPutSocketV6(tunnelHandle int32) {
-	device, ok := tunnelHandles[tunnelHandle]
-	if !ok {
-		return
-	}
-	native, ok := device.net.bind.(*NativeBind)
-	if !ok {
-		return
-	}
-	fwmark, err := unix.GetsockoptInt(native.sock6, unix.SOL_SOCKET, unix.SO_MARK)
-	if err == nil {
-		native.lastMark = uint32(fwmark)
-		device.net.fwmark = uint32(fwmark)
-	}
+//export wgVersion
+func wgVersion() *C.char {
+	return C.CString(WireGuardGoVersion)
 }
 
 func main() {}

app/tools/libwg-go/src/git.zx2c4.com/wireguard-go/jni.c

@@ -4,14 +4,15 @@
  */
 
 #include <jni.h>
+#include <stdlib.h>
+#include <string.h>
 
 struct go_string { const char *str; long n; };
 extern int wgTurnOn(struct go_string ifname, int tun_fd, struct go_string settings);
 extern void wgTurnOff(int handle);
 extern int wgGetSocketV4(int handle);
 extern int wgGetSocketV6(int handle);
-extern void wgPutSocketV4(int handle);
-extern void wgPutSocketV6(int handle);
+extern char *wgVersion();
 
 JNIEXPORT jint JNICALL Java_com_wireguard_android_backend_GoBackend_wgTurnOn(JNIEnv *env, jclass c, jstring ifname, jint tun_fd, jstring settings)
 {
@@ -46,12 +47,13 @@ JNIEXPORT jint JNICALL Java_com_wireguard_android_backend_GoBackend_wgGetSocketV
 	return wgGetSocketV6(handle);
 }
 
-JNIEXPORT void JNICALL Java_com_wireguard_android_backend_GoBackend_wgPutSocketV4(JNIEnv *env, jclass c, jint handle)
+JNIEXPORT jstring JNICALL Java_com_wireguard_android_backend_GoBackend_wgVersion(JNIEnv *env, jclass c)
 {
-	wgPutSocketV4(handle);
-}
-
-JNIEXPORT void JNICALL Java_com_wireguard_android_backend_GoBackend_wgPutSocketV6(JNIEnv *env, jclass c, jint handle)
-{
-	wgPutSocketV6(handle);
+	jstring ret;
+	char *version = wgVersion();
+	if (!version)
+		return NULL;
+	ret = (*env)->NewStringUTF(env, version);
+	free(version);
+	return ret;
 }

build.gradle

@@ -7,7 +7,7 @@ allprojects {
 
 buildscript {
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.1.2'
+        classpath 'com.android.tools.build:gradle:3.1.3'
     }
     repositories {
         google()

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-bin.zip