Update README.md (#125)

# Conflicts:
#	app/build.gradle
#	build.gradle

.github/FUNDING.yml

@@ -1 +0,0 @@
-custom: https://qr.alipay.com/a6x07022gffiehykicipv1a

.github/workflows/build.yml

@@ -0,0 +1,23 @@
+on: [ push ]
+
+name: Test build
+
+jobs:
+  build:
+    name: Build APK
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Setup JDK
+        uses: actions/setup-java@v3
+        with:
+          distribution: 'temurin'
+          java-version: 17
+      - name: Build APK
+        run: bash ./gradlew assemblePureDebug --stacktrace
+      - name: Upload APK
+        uses: actions/upload-artifact@v3
+        with:
+          name: apk
+          path: app/build/outputs/apk/pure/debug/*.apk

.travis.yml

@@ -1,21 +0,0 @@
-language: android
-jdk: oraclejdk8
-dist: xenial
-git:
-  depth: 1
-android:
-  components:
-    - tools
-    - platform-tools
-    - build-tools-28.0.3
-    - android-28
-    - extra-android-support
-    - extra-google-m2repository
-    - extra-android-m2repository
-  licenses:
-    - '.+'
-script:
-  - chmod 777 gradlew
-  - ./gradlew clean assemblePureDebug
-after_success:
-  - bash <(curl -s https://codecov.io/bash)

README.md

@@ -1,19 +1,17 @@
 # iTXTech Daedalus
 
-[![Donate](https://img.shields.io/badge/alipay-donate-yellow.svg)](https://qr.alipay.com/a6x07022gffiehykicipv1a)
-[![Build Status](https://travis-ci.org/iTXTech/Daedalus.svg?branch=master)](https://travis-ci.org/iTXTech/Daedalus)
-[![Jenkins](https://img.shields.io/jenkins/s/http/dev.itxtech.org:10298/job/Daedalus.svg)](http://dev.itxtech.org:10298/job/Daedalus/)
-
 __No root required Android DNS modifier and Hosts/DNSMasq resolver.__
 
-## Installation
-* __[Jenkins](http://dev.itxtech.org:10298/job/Daedalus/)__ - Debug signature
+## Installations
 * __[Releases](https://github.com/iTXTech/Daedalus/releases)__ - Release signature
 * __[Play Test](https://play.google.com/apps/testing/org.itxtech.daedalus)__ - Release signature
 
 [<img alt='Get it on Google Play'
       src='https://play.google.com/intl/en_us/badges/images/generic/en_badge_web_generic.png'
       height="80">](https://play.google.com/store/apps/details?id=org.itxtech.daedalus)
+[<img src="https://fdroid.gitlab.io/artwork/badge/get-it-on.png"
+     alt="Get it on F-Droid"
+     height="80">](https://f-droid.org/packages/org.itxtech.daedalus)
 
 ## Useful links
 * __[Telegram](https://t.me/iTXTechDaedalus)__ - Join chat
@@ -66,18 +64,17 @@ __Users must comply with local laws and regulations.__<br>
 * __[ClearEditText](https://github.com/MrFuFuFu/ClearEditText)__ by *[Yuan Fu](https://github.com/MrFuFuFu)* - [APL 2.0](https://github.com/MrFuFuFu/ClearEditText)
 * __[DNS66](https://github.com/julian-klode/dns66)__ by *[Julian Andres Klode](https://github.com/julian-klode)* - [GPLv3](https://github.com/julian-klode/dns66/blob/master/COPYING)
 * __[Pcap4J](https://github.com/kaitoy/pcap4j)__ by *[Kaito Yamada](https://github.com/kaitoy)* - [MIT](https://github.com/kaitoy/pcap4j)
-* __[MiniDNS](https://github.com/rtreffer/minidns)__ by *[Rene Treffer](https://github.com/rtreffer)* - [LGPLv2.1](https://github.com/rtreffer/minidns/blob/master/LICENCE_LGPL2.1)
+* __[MiniDNS](https://github.com/MiniDNS/minidns)__ by *[MiniDNS](https://github.com/MiniDNS)* - [APL 2.0](https://github.com/MiniDNS/minidns/blob/master/LICENCE_APACHE)
 * __[Gson](https://github.com/google/gson)__ by *[Google](https://github.com/google)* - [APL 2.0](https://github.com/google/gson/blob/master/LICENSE)
 * __[Shadowsocks](https://github.com/shadowsocks/shadowsocks-android)__ by *[Shadowsocks](https://github.com/shadowsocks)* - [GPLv3](https://github.com/shadowsocks/shadowsocks-android/blob/master/LICENSE)
 
 ## Credits
 
 * __[JetBrains](https://www.jetbrains.com/)__ - For providing free license for [IntelliJ IDEA](https://www.jetbrains.com/idea/)
-* __[ShenniaoTech](https://www.sncidc.com/)__ - For supporting us with love
 
 ## License
 
-    Copyright (C) 2017-2019 iTX Technologies <admin@itxtech.org>
+    Copyright (C) 2017-2022 iTX Technologies <admin@itxtech.org>
     
 	This program is free software: you can redistribute it and/or modify
 	it under the terms of the GNU General Public License as published by

app/build.gradle

@@ -10,8 +10,8 @@ android {
         applicationId "org.itxtech.daedalus"
         minSdkVersion 21
         targetSdkVersion 31
-        versionCode 20
-        versionName "1.14.1"
+        versionCode 21
+        versionName "1.15.0"
 
         buildConfigField "String", "BUILD_TIME", "\"${System.currentTimeMillis()}\""
         buildConfigField "String", "GIT_COMMIT", "\"${gitCommit}\""
@@ -58,9 +58,10 @@ dependencies {
     implementation 'androidx.cardview:cardview:1.0.0'
     implementation 'com.google.android.material:material:1.7.0-alpha01'
     implementation 'androidx.recyclerview:recyclerview:1.3.0-alpha02'
+    implementation 'androidx.preference:preference:1.2.0'
     //DNS
-    implementation 'org.pcap4j:pcap4j-core:1.7.6'
-    implementation 'org.pcap4j:pcap4j-packetfactory-static:1.7.6'
+    implementation 'org.pcap4j:pcap4j-core:1.8.2'
+    implementation 'org.pcap4j:pcap4j-packetfactory-static:1.8.2'
     implementation 'org.minidns:minidns-client:1.0.3'
     implementation 'com.google.code.gson:gson:2.9.0'
     implementation 'com.squareup.okhttp3:okhttp:4.9.3'

app/src/main/AndroidManifest.xml

@@ -4,6 +4,7 @@
 
     <uses-permission android:name="android.permission.INTERNET"/>
     <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
     <uses-permission android:name="android.permission.EXPAND_STATUS_BAR"/>
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"
                      android:maxSdkVersion="18"/>
@@ -58,7 +59,7 @@
                 android:label="@string/app_name"
                 android:launchMode="singleTask"
                 android:theme="@style/AppTheme.NoActionBar.TransparentStatusBar"
-                android:exported="false">
+                android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN"/>
 

app/src/main/assets/about_html/index.html

@@ -40,7 +40,7 @@
     <br>
     <div style="font-size: 12px; color: gray;">Users must comply with local laws and regulations.</div>
     <br>
-    <div style="font-size: 12px; color: gray;">Copyright (C) 2017-2019 iTX Technologies <a
+    <div style="font-size: 12px; color: gray;">Copyright (C) 2017-2022 iTX Technologies <a
             href="mailto:admin@itxtech.org">admin@itxtech.org</a>
     </div>
     <br>

app/src/main/assets/about_html/index_zh.html

@@ -41,7 +41,7 @@
     <br>
     <div style="font-size: 12px; color: gray;">使用者必须遵守当地法律法规。</div>
     <br>
-    <div style="font-size: 12px; color: gray;">Copyright (C) 2017-2019 iTX Technologies <a
+    <div style="font-size: 12px; color: gray;">Copyright (C) 2017-2022 iTX Technologies <a
             href="mailto:admin@itxtech.org">admin@itxtech.org</a>
     </div>
     <br>

app/src/main/java/org/itxtech/daedalus/Daedalus.java

@@ -10,20 +10,20 @@ import android.graphics.drawable.Icon;
 import android.net.Uri;
 import android.net.VpnService;
 import android.os.Build;
-import android.preference.PreferenceManager;
-import android.util.Log;
+import androidx.preference.PreferenceManager;
 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
 import com.google.gson.JsonParseException;
 import com.google.gson.stream.JsonReader;
 import org.itxtech.daedalus.activity.MainActivity;
+import org.itxtech.daedalus.server.AbstractDnsServer;
+import org.itxtech.daedalus.server.DnsServer;
+import org.itxtech.daedalus.server.DnsServerHelper;
 import org.itxtech.daedalus.service.DaedalusVpnService;
 import org.itxtech.daedalus.util.Configurations;
 import org.itxtech.daedalus.util.Logger;
 import org.itxtech.daedalus.util.Rule;
 import org.itxtech.daedalus.util.RuleResolver;
-import org.itxtech.daedalus.util.server.DNSServer;
-import org.itxtech.daedalus.util.server.DNSServerHelper;
 
 import java.io.File;
 import java.util.ArrayList;
@@ -45,28 +45,30 @@ public class Daedalus extends Application {
 
     private static final String SHORTCUT_ID_ACTIVATE = "shortcut_activate";
 
-    public static final List<DNSServer> DNS_SERVERS = new ArrayList<DNSServer>() {{
-        add(new DNSServer("101.101.101.101", R.string.server_twnic_primary));
-        add(new DNSServer("101.102.103.104", R.string.server_twnic_secondary));
-        add(new DNSServer("dns.rubyfish.cn/dns-query", R.string.server_rubyfish));
-        add(new DNSServer("cloudflare-dns.com/dns-query", R.string.server_cloudflare));
-        add(new DNSServer("dns.google/dns-query", R.string.server_google_ietf));
-        add(new DNSServer("dns.google/resolve", R.string.server_google_json));
+    public static final List<DnsServer> DNS_SERVERS = new ArrayList<DnsServer>() {{
+        add(new DnsServer("101.101.101.101", R.string.server_twnic_primary));
+        add(new DnsServer("101.102.103.104", R.string.server_twnic_secondary));
+        add(new DnsServer("rubyfish.cn/dns-query", R.string.server_rubyfish));
+        add(new DnsServer("cloudflare-dns.com/dns-query", R.string.server_cloudflare));
+        add(new DnsServer("dns.google/dns-query", R.string.server_google_ietf));
+        add(new DnsServer("dns.google/resolve", R.string.server_google_json));
     }};
 
-    public static final List<Rule> RULES = new ArrayList<Rule>() {{
+    public static final ArrayList<Rule> RULES = new ArrayList<Rule>() {{
         add(new Rule("googlehosts/hosts", "googlehosts.hosts", Rule.TYPE_HOSTS,
                 "https://raw.githubusercontent.com/googlehosts/hosts/master/hosts-files/hosts", false));
-        add(new Rule("vokins/yhosts", "vokins.hosts", Rule.TYPE_HOSTS,
-                "https://raw.githubusercontent.com/vokins/yhosts/master/hosts", false));
+        add(new Rule("VeleSila/yhosts", "vokins.hosts", Rule.TYPE_HOSTS,
+                "https://raw.githubusercontent.com/VeleSila/yhosts/master/hosts.txt", false));
         add(new Rule("adaway", "adaway.hosts", Rule.TYPE_HOSTS,
                 "https://adaway.org/hosts.txt", false));
         //Build-in DNSMasq rule providers
+        add(new Rule("anti-AD", "antiad.dnsmasq", Rule.TYPE_DNAMASQ,
+                "https://anti-ad.net/anti-ad-for-dnsmasq.conf", false));
         add(new Rule("vokins/yhosts/union", "union.dnsmasq", Rule.TYPE_DNAMASQ,
                 "https://raw.githubusercontent.com/vokins/yhosts/master/dnsmasq/union.conf", false));
     }};
 
-    public static final String[] DEFAULT_TEST_DOMAINS = new String[]{
+    public static final String[] DEFAULT_TEST_DOMAINS = {
             "google.com",
             "twitter.com",
             "youtube.com",
@@ -75,12 +77,11 @@ public class Daedalus extends Application {
     };
 
     public static Configurations configurations;
+    public static String rulePath;
+    public static String logPath;
+    private static String configPath;
 
-    public static String rulePath = null;
-    public static String logPath = null;
-    private static String configPath = null;
-
-    private static Daedalus instance = null;
+    private static Daedalus instance;
     private SharedPreferences prefs;
     private Thread mResolver;
 
@@ -89,12 +90,9 @@ public class Daedalus extends Application {
         super.onCreate();
 
         instance = this;
-
         Logger.init();
-
         mResolver = new Thread(new RuleResolver());
         mResolver.start();
-
         initData();
     }
 
@@ -135,30 +133,30 @@ public class Daedalus extends Application {
     }
 
     public static void initRuleResolver() {
-            ArrayList<String> pendingLoad = new ArrayList<>();
-            ArrayList<Rule> usingRules = configurations.getUsingRules();
-            if (usingRules != null && usingRules.size() > 0) {
-                for (Rule rule : usingRules) {
-                    if (rule.isUsing()) {
-                        pendingLoad.add(rulePath + rule.getFileName());
-                    }
+        ArrayList<String> pendingLoad = new ArrayList<>();
+        ArrayList<Rule> usingRules = configurations.getUsingRules();
+        if (usingRules != null && usingRules.size() > 0) {
+            for (Rule rule : usingRules) {
+                if (rule.isUsing()) {
+                    pendingLoad.add(rulePath + rule.getFileName());
                 }
-                if (pendingLoad.size() > 0) {
-                    String[] arr = new String[pendingLoad.size()];
-                    pendingLoad.toArray(arr);
-                    switch (usingRules.get(0).getType()) {
-                        case Rule.TYPE_HOSTS:
-                            RuleResolver.startLoadHosts(arr);
-                            break;
-                        case Rule.TYPE_DNAMASQ:
-                            RuleResolver.startLoadDnsmasq(arr);
-                            break;
-                    }
-                } else {
-                    RuleResolver.clear();
+            }
+            if (pendingLoad.size() > 0) {
+                String[] arr = new String[pendingLoad.size()];
+                pendingLoad.toArray(arr);
+                switch (usingRules.get(0).getType()) {
+                    case Rule.TYPE_HOSTS:
+                        RuleResolver.startLoadHosts(arr);
+                        break;
+                    case Rule.TYPE_DNAMASQ:
+                        RuleResolver.startLoadDnsmasq(arr);
+                        break;
                 }
             } else {
                 RuleResolver.clear();
+            }
+        } else {
+            RuleResolver.clear();
         }
     }
 
@@ -178,7 +176,6 @@ public class Daedalus extends Application {
 
     @Override
     public void onTerminate() {
-        Log.d("Daedalus", "onTerminate");
         super.onTerminate();
 
         instance = null;
@@ -199,23 +196,38 @@ public class Daedalus extends Application {
             deactivateService(instance);
             return false;
         } else {
-            activateService(instance);
+            prepareAndActivateService(instance);
             return true;
         }
     }
 
-    public static boolean activateService(Context context) {
+    public static boolean prepareAndActivateService(Context context) {
         Intent intent = VpnService.prepare(context);
         if (intent != null) {
             return false;
         } else {
-            DaedalusVpnService.primaryServer = DNSServerHelper.getAddressById(DNSServerHelper.getPrimary());
-            DaedalusVpnService.secondaryServer = DNSServerHelper.getAddressById(DNSServerHelper.getSecondary());
-            context.startService(Daedalus.getServiceIntent(context).setAction(DaedalusVpnService.ACTION_ACTIVATE));
+            activateService(context);
             return true;
         }
     }
 
+    public static void activateService(Context context) {
+        activateService(context, false);
+    }
+
+    public static void activateService(Context context, boolean forceForeground) {
+        DaedalusVpnService.primaryServer = (AbstractDnsServer) DnsServerHelper.getServerById(DnsServerHelper.getPrimary()).clone();
+        DaedalusVpnService.secondaryServer = (AbstractDnsServer) DnsServerHelper.getServerById(DnsServerHelper.getSecondary()).clone();
+        if ((getInstance().prefs.getBoolean("settings_foreground", false) || forceForeground)
+                && Build.VERSION.SDK_INT > Build.VERSION_CODES.O) {
+            Logger.info("Starting foreground service");
+            context.startForegroundService(Daedalus.getServiceIntent(context).setAction(DaedalusVpnService.ACTION_ACTIVATE));
+        } else {
+            Logger.info("Starting background service");
+            context.startService(Daedalus.getServiceIntent(context).setAction(DaedalusVpnService.ACTION_ACTIVATE));
+        }
+    }
+
     public static void deactivateService(Context context) {
         context.startService(getServiceIntent(context).setAction(DaedalusVpnService.ACTION_DEACTIVATE));
         context.stopService(getServiceIntent(context));
@@ -223,7 +235,7 @@ public class Daedalus extends Application {
 
     public static void updateShortcut(Context context) {
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N_MR1) {
-            Log.d("Daedalus", "Updating shortcut");
+            Logger.info("Updating shortcut");
             boolean activate = DaedalusVpnService.isActivated();
             String notice = activate ? context.getString(R.string.button_text_deactivate) : context.getString(R.string.button_text_activate);
             ShortcutInfo info = new ShortcutInfo.Builder(context, Daedalus.SHORTCUT_ID_ACTIVATE)
@@ -239,7 +251,7 @@ public class Daedalus extends Application {
     }
 
     public static void donate() {
-        openUri("https://qr.alipay.com/a6x07022gffiehykicipv1a");
+        openUri("https://qr.alipay.com/FKX04751EZDP0SQ0BOT137");
     }
 
     public static void openUri(String uri) {

app/src/main/java/org/itxtech/daedalus/activity/AppFilterActivity.java

@@ -40,7 +40,6 @@ import java.util.Objects;
  * (at your option) any later version.
  */
 public class AppFilterActivity extends AppCompatActivity {
-
     private RecyclerViewAdapter adapter;
 
     @Override
@@ -78,7 +77,7 @@ public class AppFilterActivity extends AppCompatActivity {
         adapter.notifyDataSetChanged();
     }
 
-    private class AppObject {
+    private static class AppObject {
         private String appName;
         private String appPackageName;
         private Drawable appIcon;
@@ -111,13 +110,11 @@ public class AppFilterActivity extends AppCompatActivity {
 
         void updateList(ArrayList<AppObject> appObjects) {
             appList = appObjects;
-
             for (int i = 0; i < appObjects.size(); i++) {
                 if (Daedalus.configurations.getAppObjects().contains(appObjects.get(i).appPackageName)) {
                     checkStatus.put(i, true);
                 }
             }
-
             runOnUiThread(this::notifyDataSetChanged);
         }
 
@@ -158,7 +155,7 @@ public class AppFilterActivity extends AppCompatActivity {
         }
     }
 
-    private class RecyclerViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
+    private static class RecyclerViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
         private ImageView appIcon;
         private TextView appName;
         private CheckBox appCheck;
@@ -172,7 +169,6 @@ public class AppFilterActivity extends AppCompatActivity {
             itemView.setOnClickListener(this);
         }
 
-
         @Override
         public void onClick(View v) {
             if (appCheck.isChecked()) {

app/src/main/java/org/itxtech/daedalus/activity/ConfigActivity.java

@@ -1,7 +1,5 @@
 package org.itxtech.daedalus.activity;
 
-import android.app.FragmentManager;
-import android.app.FragmentTransaction;
 import android.graphics.Color;
 import android.graphics.drawable.Drawable;
 import android.os.Bundle;
@@ -9,10 +7,12 @@ import androidx.appcompat.app.AppCompatActivity;
 import androidx.appcompat.widget.Toolbar;
 import androidx.core.content.ContextCompat;
 import androidx.core.graphics.drawable.DrawableCompat;
+import androidx.fragment.app.FragmentManager;
+import androidx.fragment.app.FragmentTransaction;
 import org.itxtech.daedalus.Daedalus;
 import org.itxtech.daedalus.R;
 import org.itxtech.daedalus.fragment.ConfigFragment;
-import org.itxtech.daedalus.fragment.DNSServerConfigFragment;
+import org.itxtech.daedalus.fragment.DnsServerConfigFragment;
 import org.itxtech.daedalus.fragment.RuleConfigFragment;
 
 /**
@@ -44,14 +44,12 @@ public class ConfigActivity extends AppCompatActivity {
 
         ConfigFragment fragment;
         switch (getIntent().getIntExtra(LAUNCH_ACTION_FRAGMENT, LAUNCH_FRAGMENT_DNS_SERVER)) {
-            case LAUNCH_FRAGMENT_DNS_SERVER:
-                fragment = new DNSServerConfigFragment();
-                break;
             case LAUNCH_FRAGMENT_RULE:
                 fragment = new RuleConfigFragment();
                 break;
+            case LAUNCH_FRAGMENT_DNS_SERVER:
             default://should never reach this
-                fragment = new DNSServerConfigFragment();
+                fragment = new DnsServerConfigFragment();
                 break;
         }
 
@@ -64,7 +62,7 @@ public class ConfigActivity extends AppCompatActivity {
         toolbar.setOnMenuItemClickListener(fragment);
         toolbar.inflateMenu(R.menu.custom_config);
 
-        FragmentManager manager = getFragmentManager();
+        FragmentManager manager = getSupportFragmentManager();
         fragment.setIntent(getIntent());
         FragmentTransaction fragmentTransaction = manager.beginTransaction();
         fragmentTransaction.replace(R.id.id_config, fragment);

app/src/main/java/org/itxtech/daedalus/activity/MainActivity.java

@@ -1,9 +1,7 @@
 package org.itxtech.daedalus.activity;
 
 import android.app.Activity;
-import android.app.FragmentManager;
 import android.content.Context;
-import android.content.DialogInterface;
 import android.content.Intent;
 import android.net.VpnService;
 import android.os.Bundle;
@@ -14,7 +12,6 @@ import android.widget.Button;
 import android.widget.TextView;
 import androidx.annotation.NonNull;
 import androidx.appcompat.app.ActionBarDrawerToggle;
-import androidx.appcompat.app.AlertDialog;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.appcompat.widget.Toolbar;
 import androidx.core.view.GravityCompat;
@@ -26,7 +23,6 @@ import org.itxtech.daedalus.R;
 import org.itxtech.daedalus.fragment.*;
 import org.itxtech.daedalus.service.DaedalusVpnService;
 import org.itxtech.daedalus.util.Logger;
-import org.itxtech.daedalus.util.server.DNSServerHelper;
 
 /**
  * Daedalus Project
@@ -100,8 +96,7 @@ public class MainActivity extends AppCompatActivity implements NavigationView.On
         if (currentFragment == null || fragmentClass != currentFragment.getClass()) {
             try {
                 ToolbarFragment fragment = (ToolbarFragment) fragmentClass.newInstance();
-                FragmentManager fm = getFragmentManager();
-                fm.beginTransaction().replace(R.id.id_content, fragment).commit();
+                getSupportFragmentManager().beginTransaction().replace(R.id.id_content, fragment).commit();
                 currentFragment = fragment;
             } catch (Exception e) {
                 Logger.logException(e);
@@ -149,40 +144,31 @@ public class MainActivity extends AppCompatActivity implements NavigationView.On
         }
         activateCounter++;
         Daedalus.configurations.setActivateCounter(activateCounter);
-        if (activateCounter % 10 == 0) {
-            new AlertDialog.Builder(this)
-                    .setTitle("觉得还不错？")
-                    .setMessage("您的支持是我动力来源！\n请考虑为我买杯咖啡醒醒脑，甚至其他…… ;)")
-                    .setPositiveButton("为我买杯咖啡", new DialogInterface.OnClickListener() {
-                        @Override
-                        public void onClick(DialogInterface dialog, int which) {
-                            Daedalus.donate();
-                            new AlertDialog.Builder(MainActivity.this)
-                                    .setMessage("感谢您的支持！;)\n我会再接再厉！")
-                                    .setPositiveButton("确认", null)
-                                    .show();
-                        }
-                    })
-                    .setNeutralButton("不再显示", new DialogInterface.OnClickListener() {
-                        @Override
-                        public void onClick(DialogInterface dialog, int which) {
-                            Daedalus.configurations.setActivateCounter(-1);
-                        }
-                    })
-                    .setNegativeButton("取消", null)
-                    .show();
-        }
+//        if (activateCounter % 10 == 0) {
+//            new AlertDialog.Builder(this)
+//                    .setTitle("觉得还不错？")
+//                    .setMessage("您的支持是我动力来源！\n请考虑为我买杯咖啡醒醒脑，甚至其他…… ;)")
+//                    .setPositiveButton("为我买杯咖啡", (dialog, which) -> {
+//                        Daedalus.donate();
+//                        new AlertDialog.Builder(MainActivity.this)
+//                                .setMessage("感谢您的支持！;)\n我会再接再厉！")
+//                                .setPositiveButton("确认", null)
+//                                .show();
+//                    })
+//                    .setNeutralButton("不再显示", (dialog, which) -> Daedalus.configurations.setActivateCounter(-1))
+//                    .setNegativeButton("取消", null)
+//                    .show();
+//        }
     }
 
     public void onActivityResult(int request, int result, Intent data) {
         super.onActivityResult(request, result, data);
         if (result == Activity.RESULT_OK) {
-            DaedalusVpnService.primaryServer = DNSServerHelper.getAddressById(DNSServerHelper.getPrimary());
-            DaedalusVpnService.secondaryServer = DNSServerHelper.getAddressById(DNSServerHelper.getSecondary());
-            Daedalus.getInstance().startService(Daedalus.getServiceIntent(getApplicationContext()).setAction(DaedalusVpnService.ACTION_ACTIVATE));
+            Daedalus.activateService(Daedalus.getInstance());
             updateMainButton(R.string.button_text_deactivate);
             Daedalus.updateShortcut(getApplicationContext());
         }
+        super.onActivityResult(request, result, data);
     }
 
     private void updateMainButton(int id) {
@@ -194,7 +180,7 @@ public class MainActivity extends AppCompatActivity implements NavigationView.On
 
     private void updateUserInterface(Intent intent) {
         int launchAction = intent.getIntExtra(LAUNCH_ACTION, LAUNCH_ACTION_NONE);
-        Log.d(TAG, "Updating user interface with Launch Action " + String.valueOf(launchAction));
+        Log.d(TAG, "Updating user interface with Launch Action " + launchAction);
         if (launchAction == LAUNCH_ACTION_ACTIVATE) {
             this.activateService();
         } else if (launchAction == LAUNCH_ACTION_DEACTIVATE) {
@@ -227,10 +213,10 @@ public class MainActivity extends AppCompatActivity implements NavigationView.On
                 switchFragment(AboutFragment.class);
                 break;
             case FRAGMENT_DNS_SERVERS:
-                switchFragment(DNSServersFragment.class);
+                switchFragment(DnsServersFragment.class);
                 break;
             case FRAGMENT_DNS_TEST:
-                switchFragment(DNSTestFragment.class);
+                switchFragment(DnsTestFragment.class);
                 break;
             case FRAGMENT_HOME:
                 switchFragment(HomeFragment.class);
@@ -252,7 +238,6 @@ public class MainActivity extends AppCompatActivity implements NavigationView.On
 
     @Override
     public boolean onNavigationItemSelected(@NonNull MenuItem item) {
-        // Handle navigation view item clicks here.
         int id = item.getItemId();
 
         switch (id) {
@@ -260,10 +245,10 @@ public class MainActivity extends AppCompatActivity implements NavigationView.On
                 switchFragment(AboutFragment.class);
                 break;
             case R.id.nav_dns_server:
-                switchFragment(DNSServersFragment.class);
+                switchFragment(DnsServersFragment.class);
                 break;
             case R.id.nav_dns_test:
-                switchFragment(DNSTestFragment.class);
+                switchFragment(DnsTestFragment.class);
                 break;
             case R.id.nav_github:
                 Daedalus.openUri("https://github.com/iTXTech/Daedalus");

app/src/main/java/org/itxtech/daedalus/fragment/AboutFragment.java

@@ -13,6 +13,7 @@ import android.webkit.WebViewClient;
 import org.itxtech.daedalus.BuildConfig;
 import org.itxtech.daedalus.Daedalus;
 import org.itxtech.daedalus.R;
+import org.itxtech.daedalus.util.Logger;
 
 import java.util.Locale;
 
@@ -64,7 +65,7 @@ public class AboutFragment extends ToolbarFragment {
                     mWebView.loadUrl("javascript:changeColor('"+(Daedalus.isDarkTheme() ? "#FFFFFF" : "#000000")+"')");
                     mWebView.loadUrl("javascript:changeVersionInfo('" + Daedalus.getInstance().getPackageManager().getPackageInfo(Daedalus.getInstance().getPackageName(), 0).versionName + "', '" + BuildConfig.BUILD_TIME + "', '" + BuildConfig.GIT_COMMIT + "')");
                 } catch (Exception e) {
-                    Log.e("DAboutActivity", e.toString());
+                    Logger.logException(e);
                 }
             }
         });
@@ -82,8 +83,6 @@ public class AboutFragment extends ToolbarFragment {
         super.onDestroyView();
 
         if (mWebView != null) {
-            Log.d("DAboutActivity", "onDestroy");
-
             mWebView.removeAllViews();
             mWebView.setWebViewClient(null);
             ((ViewGroup) mWebView.getParent()).removeView(mWebView);

app/src/main/java/org/itxtech/daedalus/fragment/ConfigFragment.java

@@ -1,8 +1,8 @@
 package org.itxtech.daedalus.fragment;
 
 import android.content.Intent;
-import android.preference.PreferenceFragment;
 import androidx.appcompat.widget.Toolbar;
+import androidx.preference.PreferenceFragmentCompat;
 
 /**
  * Daedalus Project
@@ -15,7 +15,7 @@ import androidx.appcompat.widget.Toolbar;
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
  */
-abstract public class ConfigFragment extends PreferenceFragment implements Toolbar.OnMenuItemClickListener {
+abstract public class ConfigFragment extends PreferenceFragmentCompat implements Toolbar.OnMenuItemClickListener {
     protected Intent intent = null;
 
     public void setIntent(Intent intent) {

app/src/main/java/org/itxtech/daedalus/fragment/DnsServerConfigFragment.java

@@ -2,7 +2,7 @@ package org.itxtech.daedalus.fragment;
 
 import android.app.AlertDialog;
 import android.os.Bundle;
-import android.preference.EditTextPreference;
+import androidx.preference.EditTextPreference;
 import android.view.LayoutInflater;
 import android.view.MenuItem;
 import android.view.View;
@@ -11,8 +11,8 @@ import com.google.android.material.snackbar.Snackbar;
 import org.itxtech.daedalus.Daedalus;
 import org.itxtech.daedalus.R;
 import org.itxtech.daedalus.activity.ConfigActivity;
-import org.itxtech.daedalus.util.server.CustomDNSServer;
-import org.itxtech.daedalus.util.server.DNSServer;
+import org.itxtech.daedalus.server.CustomDnsServer;
+import org.itxtech.daedalus.server.DnsServer;
 
 /**
  * Daedalus Project
@@ -25,12 +25,11 @@ import org.itxtech.daedalus.util.server.DNSServer;
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
  */
-public class DNSServerConfigFragment extends ConfigFragment {
+public class DnsServerConfigFragment extends ConfigFragment {
     private int index;
 
     @Override
-    public void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
+    public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
         addPreferencesFromResource(R.xml.perf_server);
     }
 
@@ -38,19 +37,19 @@ public class DNSServerConfigFragment extends ConfigFragment {
     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
         View view = super.onCreateView(inflater, container, savedInstanceState);
 
-        EditTextPreference serverName = (EditTextPreference) findPreference("serverName");
+        EditTextPreference serverName = findPreference("serverName");
         serverName.setOnPreferenceChangeListener((preference, newValue) -> {
             preference.setSummary((String) newValue);
             return true;
         });
 
-        EditTextPreference serverAddress = (EditTextPreference) findPreference("serverAddress");
+        EditTextPreference serverAddress = findPreference("serverAddress");
         serverAddress.setOnPreferenceChangeListener((preference, newValue) -> {
             preference.setSummary((String) newValue);
             return true;
         });
 
-        EditTextPreference serverPort = (EditTextPreference) findPreference("serverPort");
+        EditTextPreference serverPort = findPreference("serverPort");
         serverPort.setOnPreferenceChangeListener((preference, newValue) -> {
             preference.setSummary((String) newValue);
             return true;
@@ -59,7 +58,7 @@ public class DNSServerConfigFragment extends ConfigFragment {
 
         index = intent.getIntExtra(ConfigActivity.LAUNCH_ACTION_ID, ConfigActivity.ID_NONE);
         if (index != ConfigActivity.ID_NONE) {
-            CustomDNSServer server = Daedalus.configurations.getCustomDNSServers().get(index);
+            CustomDnsServer server = Daedalus.configurations.getCustomDNSServers().get(index);
             serverName.setText(server.getName());
             serverName.setSummary(server.getName());
             serverAddress.setText(server.getAddress());
@@ -69,7 +68,7 @@ public class DNSServerConfigFragment extends ConfigFragment {
         } else {
             serverName.setText("");
             serverAddress.setText("");
-            String port = String.valueOf(DNSServer.DNS_SERVER_DEFAULT_PORT);
+            String port = String.valueOf(DnsServer.DNS_SERVER_DEFAULT_PORT);
             serverPort.setText(port);
             serverPort.setSummary(port);
         }
@@ -93,9 +92,9 @@ public class DNSServerConfigFragment extends ConfigFragment {
                 }
 
                 if (index == ConfigActivity.ID_NONE) {
-                    Daedalus.configurations.getCustomDNSServers().add(new CustomDNSServer(serverName, serverAddress, Integer.parseInt(serverPort)));
+                    Daedalus.configurations.getCustomDNSServers().add(new CustomDnsServer(serverName, serverAddress, Integer.parseInt(serverPort)));
                 } else {
-                    CustomDNSServer server = Daedalus.configurations.getCustomDNSServers().get(index);
+                    CustomDnsServer server = Daedalus.configurations.getCustomDNSServers().get(index);
                     server.setName(serverName);
                     server.setAddress(serverAddress);
                     server.setPort(Integer.parseInt(serverPort));

app/src/main/java/org/itxtech/daedalus/fragment/DnsServersFragment.java

@@ -15,8 +15,8 @@ import com.google.android.material.snackbar.Snackbar;
 import org.itxtech.daedalus.Daedalus;
 import org.itxtech.daedalus.R;
 import org.itxtech.daedalus.activity.ConfigActivity;
-import org.itxtech.daedalus.util.server.CustomDNSServer;
-import org.itxtech.daedalus.util.server.DNSServerHelper;
+import org.itxtech.daedalus.server.CustomDnsServer;
+import org.itxtech.daedalus.server.DnsServerHelper;
 
 /**
  * Daedalus Project
@@ -29,9 +29,9 @@ import org.itxtech.daedalus.util.server.DNSServerHelper;
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
  */
-public class DNSServersFragment extends ToolbarFragment {
+public class DnsServersFragment extends ToolbarFragment {
     private DNSServerAdapter adapter;
-    private CustomDNSServer server = null;
+    private CustomDnsServer server = null;
 
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
@@ -47,7 +47,7 @@ public class DNSServersFragment extends ToolbarFragment {
                 if (viewHolder instanceof ViewHolder) {
                     int index = ((ViewHolder) viewHolder).getIndex();
                     if (index < Daedalus.configurations.getCustomDNSServers().size() &&
-                            DNSServerHelper.isInUsing(Daedalus.configurations.getCustomDNSServers().get(index))) {
+                            DnsServerHelper.isInUsing(Daedalus.configurations.getCustomDNSServers().get(index))) {
                         return 0;
                     }
                 }
@@ -118,7 +118,7 @@ public class DNSServersFragment extends ToolbarFragment {
     private class DNSServerAdapter extends RecyclerView.Adapter<ViewHolder> {
         @Override
         public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
-            CustomDNSServer server = Daedalus.configurations.getCustomDNSServers().get(position);
+            CustomDnsServer server = Daedalus.configurations.getCustomDNSServers().get(position);
             holder.setIndex(position);
             holder.textViewName.setText(server.getName());
             holder.textViewAddress.setText(server.getRealName());
@@ -159,7 +159,7 @@ public class DNSServersFragment extends ToolbarFragment {
 
         @Override
         public void onClick(View v) {
-            if (!DNSServerHelper.isInUsing(Daedalus.configurations.getCustomDNSServers().get(index))) {
+            if (!DnsServerHelper.isInUsing(Daedalus.configurations.getCustomDNSServers().get(index))) {
                 Daedalus.getInstance().startActivity(new Intent(Daedalus.getInstance(), ConfigActivity.class)
                         .putExtra(ConfigActivity.LAUNCH_ACTION_ID, index)
                         .putExtra(ConfigActivity.LAUNCH_ACTION_FRAGMENT, ConfigActivity.LAUNCH_FRAGMENT_DNS_SERVER)

app/src/main/java/org/itxtech/daedalus/fragment/DnsTestFragment.java

@@ -12,8 +12,8 @@ import android.widget.*;
 import org.itxtech.daedalus.Daedalus;
 import org.itxtech.daedalus.R;
 import org.itxtech.daedalus.util.Logger;
-import org.itxtech.daedalus.util.server.AbstractDNSServer;
-import org.itxtech.daedalus.util.server.DNSServerHelper;
+import org.itxtech.daedalus.server.AbstractDnsServer;
+import org.itxtech.daedalus.server.DnsServerHelper;
 import org.minidns.dnsmessage.DnsMessage;
 import org.minidns.dnsmessage.Question;
 import org.minidns.record.Record;
@@ -36,7 +36,7 @@ import java.util.Random;
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
  */
-public class DNSTestFragment extends ToolbarFragment {
+public class DnsTestFragment extends ToolbarFragment {
     private class Type {
         private Record.TYPE type;
         private String name;
@@ -67,9 +67,9 @@ public class DNSTestFragment extends ToolbarFragment {
         final TextView textViewTestInfo = view.findViewById(R.id.textView_test_info);
 
         final Spinner spinnerServerChoice = view.findViewById(R.id.spinner_server_choice);
-        ArrayAdapter spinnerArrayAdapter = new ArrayAdapter<>(getActivity(), android.R.layout.simple_list_item_1, DNSServerHelper.getAllServers());
+        ArrayAdapter spinnerArrayAdapter = new ArrayAdapter<>(getActivity(), android.R.layout.simple_list_item_1, DnsServerHelper.getAllServers());
         spinnerServerChoice.setAdapter(spinnerArrayAdapter);
-        spinnerServerChoice.setSelection(DNSServerHelper.getPosition(DNSServerHelper.getPrimary()));
+        spinnerServerChoice.setSelection(DnsServerHelper.getPosition(DnsServerHelper.getPrimary()));
 
         ArrayList<Type> types = new ArrayList<Type>() {{
             add(new Type("A", Record.TYPE.A));
@@ -110,38 +110,38 @@ public class DNSTestFragment extends ToolbarFragment {
                         testDomain = Daedalus.DEFAULT_TEST_DOMAINS[0];
                     }
                     StringBuilder testText = new StringBuilder();
-                    ArrayList<AbstractDNSServer> dnsServers = new ArrayList<AbstractDNSServer>() {{
-                        add(((AbstractDNSServer) spinnerServerChoice.getSelectedItem()));
+                    ArrayList<AbstractDnsServer> dnsServers = new ArrayList<AbstractDnsServer>() {{
+                        add(((AbstractDnsServer) spinnerServerChoice.getSelectedItem()));
                         String servers = Daedalus.getPrefs().getString("dns_test_servers", "");
                         if (!servers.equals("")) {
                             for (String server : servers.split(",")) {
                                 if (server.contains(".") && server.contains(":")) {//IPv4
                                     String[] pieces = servers.split(":");
-                                    int port = AbstractDNSServer.DNS_SERVER_DEFAULT_PORT;
+                                    int port = AbstractDnsServer.DNS_SERVER_DEFAULT_PORT;
                                     try {
                                         port = Integer.parseInt(pieces[1]);
                                     } catch (Exception e) {
                                         Logger.logException(e);
                                     }
-                                    add(new AbstractDNSServer(pieces[0], port));
+                                    add(new AbstractDnsServer(pieces[0], port));
                                 } else if (!server.contains(".") && server.contains("|")) {//IPv6
                                     String[] pieces = servers.split("\\|");
-                                    int port = AbstractDNSServer.DNS_SERVER_DEFAULT_PORT;
+                                    int port = AbstractDnsServer.DNS_SERVER_DEFAULT_PORT;
                                     try {
                                         port = Integer.parseInt(pieces[1]);
                                     } catch (Exception e) {
                                         Logger.logException(e);
                                     }
-                                    add(new AbstractDNSServer(pieces[0], port));
+                                    add(new AbstractDnsServer(pieces[0], port));
                                 } else {
-                                    add(new AbstractDNSServer(server, AbstractDNSServer.DNS_SERVER_DEFAULT_PORT));
+                                    add(new AbstractDnsServer(server, AbstractDnsServer.DNS_SERVER_DEFAULT_PORT));
                                 }
                             }
                         }
                     }};
                     DnsQuery dnsQuery = new DnsQuery();
                     Record.TYPE type = ((Type) spinnerType.getSelectedItem()).getType();
-                    for (AbstractDNSServer dnsServer : dnsServers) {
+                    for (AbstractDnsServer dnsServer : dnsServers) {
                         testText = testServer(dnsQuery, type, dnsServer, testDomain, testText);
                     }
                     mHandler.obtainMessage(DnsTestHandler.MSG_TEST_DONE).sendToTarget();
@@ -151,8 +151,7 @@ public class DNSTestFragment extends ToolbarFragment {
                 }
             }
 
-
-            private StringBuilder testServer(DnsQuery dnsQuery, Record.TYPE type, AbstractDNSServer server, String domain, StringBuilder testText) {
+            private StringBuilder testServer(DnsQuery dnsQuery, Record.TYPE type, AbstractDnsServer server, String domain, StringBuilder testText) {
                 Logger.debug("Testing DNS server " + server.getRealName());
                 testText.append(getString(R.string.test_domain)).append(" ").append(domain).append("\n")
                         .append(getString(R.string.test_dns_server)).append(" ").append(server.getRealName());
@@ -181,7 +180,7 @@ public class DNSTestFragment extends ToolbarFragment {
                                 }
                             }
                             testText.append("\n").append(getString(R.string.test_time_used)).append(" ").
-                                    append(String.valueOf(endTime - startTime)).append(" ms");
+                                    append(endTime - startTime).append(" ms");
                             succ = true;
                         }
                     } catch (SocketTimeoutException ignored) {

app/src/main/java/org/itxtech/daedalus/fragment/GlobalConfigFragment.java

@@ -2,12 +2,14 @@ package org.itxtech.daedalus.fragment;
 
 import android.content.Intent;
 import android.os.Bundle;
-import android.preference.*;
+import androidx.preference.*;
 import org.itxtech.daedalus.Daedalus;
 import org.itxtech.daedalus.R;
 import org.itxtech.daedalus.activity.AppFilterActivity;
 import org.itxtech.daedalus.activity.MainActivity;
-import org.itxtech.daedalus.util.server.DNSServerHelper;
+import org.itxtech.daedalus.server.DnsServerHelper;
+
+import java.util.ArrayList;
 
 /**
  * Daedalus Project
@@ -20,52 +22,47 @@ import org.itxtech.daedalus.util.server.DNSServerHelper;
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
  */
-public class GlobalConfigFragment extends PreferenceFragment {
+public class GlobalConfigFragment extends PreferenceFragmentCompat {
 
     @Override
-    public void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
-
+    public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
         Daedalus.getPrefs().edit()
-                .putString("primary_server", DNSServerHelper.getPrimary())
-                .putString("secondary_server", DNSServerHelper.getSecondary())
+                .putString("primary_server", DnsServerHelper.getPrimary())
+                .putString("secondary_server", DnsServerHelper.getSecondary())
                 .apply();
 
         addPreferencesFromResource(R.xml.perf_settings);
 
-        ListPreference primaryServer = (ListPreference) findPreference("primary_server");
-        primaryServer.setEntries(DNSServerHelper.getNames(Daedalus.getInstance()));
-        primaryServer.setEntryValues(DNSServerHelper.getIds());
-        primaryServer.setSummary(DNSServerHelper.getDescription(primaryServer.getValue(), Daedalus.getInstance()));
-        primaryServer.setOnPreferenceChangeListener((preference, newValue) -> {
-            preference.setSummary(DNSServerHelper.getDescription((String) newValue, Daedalus.getInstance()));
-            return true;
-        });
+        boolean visible = !Daedalus.getPrefs().getBoolean("settings_use_system_dns", false);
+        for (String k : new ArrayList<String>() {{
+            add("primary_server");
+            add("secondary_server");
+        }}) {
+            ListPreference listPref = findPreference(k);
+            listPref.setEntries(DnsServerHelper.getNames(Daedalus.getInstance()));
+            listPref.setEntryValues(DnsServerHelper.getIds());
+            listPref.setSummary(DnsServerHelper.getDescription(listPref.getValue(), Daedalus.getInstance()));
+            listPref.setOnPreferenceChangeListener((preference, newValue) -> {
+                preference.setSummary(DnsServerHelper.getDescription((String) newValue, Daedalus.getInstance()));
+                return true;
+            });
+        }
 
-        ListPreference secondaryServer = (ListPreference) findPreference("secondary_server");
-        secondaryServer.setEntries(DNSServerHelper.getNames(Daedalus.getInstance()));
-        secondaryServer.setEntryValues(DNSServerHelper.getIds());
-        secondaryServer.setSummary(DNSServerHelper.getDescription(secondaryServer.getValue(), Daedalus.getInstance()));
-        secondaryServer.setOnPreferenceChangeListener((preference, newValue) -> {
-            preference.setSummary(DNSServerHelper.getDescription((String) newValue, Daedalus.getInstance()));
-            return true;
-        });
-
-        EditTextPreference testDNSServers = (EditTextPreference) findPreference("dns_test_servers");
+        EditTextPreference testDNSServers = findPreference("dns_test_servers");
         testDNSServers.setSummary(testDNSServers.getText());
         testDNSServers.setOnPreferenceChangeListener((preference, newValue) -> {
             preference.setSummary((String) newValue);
             return true;
         });
 
-        EditTextPreference logSize = (EditTextPreference) findPreference("settings_log_size");
+        EditTextPreference logSize = findPreference("settings_log_size");
         logSize.setSummary(logSize.getText());
         logSize.setOnPreferenceChangeListener((preference, newValue) -> {
             preference.setSummary((String) newValue);
             return true;
         });
 
-        SwitchPreference darkTheme = (SwitchPreference) findPreference("settings_dark_theme");
+        SwitchPreference darkTheme = findPreference("settings_dark_theme");
         darkTheme.setOnPreferenceChangeListener((preference, o) -> {
             getActivity().startActivity(new Intent(Daedalus.getInstance(), MainActivity.class)
                     .putExtra(MainActivity.LAUNCH_FRAGMENT, MainActivity.FRAGMENT_SETTINGS)
@@ -73,13 +70,13 @@ public class GlobalConfigFragment extends PreferenceFragment {
             return true;
         });
 
-        SwitchPreference advanced = (SwitchPreference) findPreference("settings_advanced_switch");
+        SwitchPreference advanced = findPreference("settings_advanced_switch");
         advanced.setOnPreferenceChangeListener((preference, newValue) -> {
             updateOptions((boolean) newValue, "settings_advanced");
             return true;
         });
 
-        SwitchPreference appFilter = (SwitchPreference) findPreference("settings_app_filter_switch");
+        SwitchPreference appFilter = findPreference("settings_app_filter_switch");
         appFilter.setOnPreferenceChangeListener((p, w) -> {
             updateOptions((boolean) w, "settings_app_filter");
             return true;
@@ -115,7 +112,7 @@ public class GlobalConfigFragment extends PreferenceFragment {
     }
 
     private void updateOptions(boolean checked, String pref) {
-        PreferenceCategory category = (PreferenceCategory) findPreference(pref);
+        PreferenceCategory category = findPreference(pref);
         for (int i = 1; i < category.getPreferenceCount(); i++) {
             Preference preference = category.getPreference(i);
             if (checked) {

app/src/main/java/org/itxtech/daedalus/fragment/HomeFragment.java

@@ -49,16 +49,7 @@ public class HomeFragment extends ToolbarFragment {
         updateUserInterface();
     }
 
-    @Override
-    public void setUserVisibleHint(boolean isVisibleToUser) {
-        super.setUserVisibleHint(isVisibleToUser);
-        if (isVisibleToUser) {
-            updateUserInterface();
-        }
-    }
-
     private void updateUserInterface() {
-        Log.d("DMainFragment", "updateInterface");
         Button but = getView().findViewById(R.id.button_activate);
         if (DaedalusVpnService.isActivated()) {
             but.setText(R.string.button_text_deactivate);

app/src/main/java/org/itxtech/daedalus/fragment/LogFragment.java

@@ -44,7 +44,7 @@ public class LogFragment extends ToolbarFragment implements Toolbar.OnMenuItemCl
 
     private void export() {
         try {
-            String file = Daedalus.logPath + String.valueOf(System.currentTimeMillis()) + ".log";
+            String file = Daedalus.logPath + System.currentTimeMillis() + ".log";
             FileWriter fileWriter = new FileWriter(file);
             fileWriter.write(Logger.getLog());
             fileWriter.close();

app/src/main/java/org/itxtech/daedalus/fragment/RuleConfigFragment.java

@@ -7,8 +7,8 @@ import android.net.Uri;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Message;
-import android.preference.EditTextPreference;
-import android.preference.ListPreference;
+import androidx.preference.EditTextPreference;
+import androidx.preference.ListPreference;
 import android.view.LayoutInflater;
 import android.view.MenuItem;
 import android.view.View;
@@ -72,10 +72,8 @@ public class RuleConfigFragment extends ConfigFragment {
         }
     }
 
-
     @Override
-    public void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
+    public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
         addPreferencesFromResource(R.xml.perf_rule);
     }
 
@@ -85,13 +83,13 @@ public class RuleConfigFragment extends ConfigFragment {
 
         mHandler = new RuleConfigHandler().setView(view);
 
-        final EditTextPreference ruleName = (EditTextPreference) findPreference("ruleName");
+        final EditTextPreference ruleName = findPreference("ruleName");
         ruleName.setOnPreferenceChangeListener((preference, newValue) -> {
             preference.setSummary((String) newValue);
             return true;
         });
 
-        final ListPreference ruleType = (ListPreference) findPreference("ruleType");
+        final ListPreference ruleType = findPreference("ruleType");
         final String[] entries = {"Hosts", "DNSMasq"};
         String[] values = {"0", "1"};
         ruleType.setEntries(entries);
@@ -101,19 +99,19 @@ public class RuleConfigFragment extends ConfigFragment {
             return true;
         });
 
-        final EditTextPreference ruleDownloadUrl = (EditTextPreference) findPreference("ruleDownloadUrl");
+        final EditTextPreference ruleDownloadUrl = findPreference("ruleDownloadUrl");
         ruleDownloadUrl.setOnPreferenceChangeListener((preference, newValue) -> {
             preference.setSummary((String) newValue);
             return true;
         });
 
-        final EditTextPreference ruleFilename = (EditTextPreference) findPreference("ruleFilename");
+        final EditTextPreference ruleFilename = findPreference("ruleFilename");
         ruleFilename.setOnPreferenceChangeListener((preference, newValue) -> {
             preference.setSummary((String) newValue);
             return true;
         });
 
-        ClickPreference ruleSync = (ClickPreference) findPreference("ruleSync");
+        ClickPreference ruleSync = findPreference("ruleSync");
         ruleSync.setOnPreferenceClickListener(preference -> {
             save();
             if (mThread == null) {
@@ -167,7 +165,7 @@ public class RuleConfigFragment extends ConfigFragment {
             return false;
         });
 
-        ListPreference ruleImportBuildIn = (ListPreference) findPreference("ruleImportBuildIn");
+        ListPreference ruleImportBuildIn = findPreference("ruleImportBuildIn");
         ruleImportBuildIn.setEntries(Rule.getBuildInRuleNames());
         ruleImportBuildIn.setEntryValues(Rule.getBuildInRuleEntries());
         ruleImportBuildIn.setOnPreferenceChangeListener((preference, newValue) -> {
@@ -183,7 +181,7 @@ public class RuleConfigFragment extends ConfigFragment {
             return true;
         });
 
-        ClickPreference ruleImportExternal = (ClickPreference) findPreference("ruleImportExternal");
+        ClickPreference ruleImportExternal = findPreference("ruleImportExternal");
         ruleImportExternal.setOnPreferenceClickListener(preference -> {
             performFileSearch();
             return false;

app/src/main/java/org/itxtech/daedalus/fragment/SettingsFragment.java

@@ -1,7 +1,5 @@
 package org.itxtech.daedalus.fragment;
 
-import android.app.FragmentManager;
-import android.os.Build;
 import android.os.Bundle;
 import android.view.LayoutInflater;
 import android.view.View;
@@ -28,13 +26,7 @@ public class SettingsFragment extends ToolbarFragment {
     @Override
     public void onViewCreated(View view, Bundle savedInstanceState) {
         super.onViewCreated(view, savedInstanceState);
-        FragmentManager fm;
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
-            fm = getChildFragmentManager();
-        } else {
-            fm = getFragmentManager();
-        }
-        fm.beginTransaction().replace(R.id.settings_content, new GlobalConfigFragment()).commit();
+        getChildFragmentManager().beginTransaction().replace(R.id.settings_content, new GlobalConfigFragment()).commit();
     }
 
     @Override

app/src/main/java/org/itxtech/daedalus/fragment/ToolbarFragment.java

@@ -1,10 +1,10 @@
 package org.itxtech.daedalus.fragment;
 
-import android.app.Fragment;
 import android.os.Bundle;
 import android.view.Menu;
 import android.view.View;
 import androidx.appcompat.widget.Toolbar;
+import androidx.fragment.app.Fragment;
 import com.google.android.material.navigation.NavigationView;
 import org.itxtech.daedalus.R;
 

app/src/main/java/org/itxtech/daedalus/provider/HttpsProvider.java

@@ -10,7 +10,7 @@ import okhttp3.OkHttpClient;
 import org.itxtech.daedalus.Daedalus;
 import org.itxtech.daedalus.service.DaedalusVpnService;
 import org.itxtech.daedalus.util.Logger;
-import org.itxtech.daedalus.util.server.DNSServerHelper;
+import org.itxtech.daedalus.server.DnsServerHelper;
 import org.minidns.dnsmessage.DnsMessage;
 import org.pcap4j.packet.IpPacket;
 import org.pcap4j.packet.IpSelector;
@@ -58,8 +58,8 @@ abstract public class HttpsProvider extends Provider {
                         .header("Accept", accept)
                         .build()))
                 .dns(hostname -> {
-                    if (DNSServerHelper.domainCache.containsKey(hostname)) {
-                        return DNSServerHelper.domainCache.get(hostname);
+                    if (DnsServerHelper.domainCache.containsKey(hostname)) {
+                        return DnsServerHelper.domainCache.get(hostname);
                     }
                     return Arrays.asList(InetAddress.getAllByName(hostname));
                 })
@@ -138,7 +138,7 @@ abstract public class HttpsProvider extends Provider {
             return;
         String uri;
         try {
-            uri = service.dnsServers.get(destAddr.getHostAddress());//https uri
+            uri = service.dnsServers.get(destAddr.getHostAddress()).getAddress();//https uri
         } catch (Exception e) {
             Logger.logException(e);
             return;
@@ -161,7 +161,7 @@ abstract public class HttpsProvider extends Provider {
             return;
         }
         if (dnsMsg.getQuestion() == null) {
-            Log.i(TAG, "handleDnsRequest: Discarding DNS packet with no query " + dnsMsg);
+            Logger.debug("handleDnsRequest: Discarding DNS packet with no query " + dnsMsg);
             return;
         }
 

app/src/main/java/org/itxtech/daedalus/provider/ProviderPicker.java

@@ -15,7 +15,7 @@ import org.itxtech.daedalus.service.DaedalusVpnService;
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
  */
-public class ProviderPicker {
+public abstract class ProviderPicker {
     public static final int DNS_QUERY_METHOD_UDP = 0;
     public static final int DNS_QUERY_METHOD_TCP = 1;
     public static final int DNS_QUERY_METHOD_TLS = 2;
@@ -40,6 +40,6 @@ public class ProviderPicker {
     }
 
     public static int getDnsQueryMethod() {
-        return Integer.valueOf(Daedalus.getPrefs().getString("settings_dns_query_method", "0"));
+        return Integer.parseInt(Daedalus.getPrefs().getString("settings_dns_query_method", "0"));
     }
 }

app/src/main/java/org/itxtech/daedalus/provider/TcpProvider.java

@@ -9,7 +9,7 @@ import android.util.Log;
 import androidx.annotation.NonNull;
 import org.itxtech.daedalus.service.DaedalusVpnService;
 import org.itxtech.daedalus.util.Logger;
-import org.itxtech.daedalus.util.server.DNSServerHelper;
+import org.itxtech.daedalus.server.AbstractDnsServer;
 import org.pcap4j.packet.IpPacket;
 
 import java.io.*;
@@ -123,7 +123,7 @@ public class TcpProvider extends UdpProvider {
     }
 
     @Override
-    protected void forwardPacket(DatagramPacket outPacket, IpPacket parsedPacket) throws DaedalusVpnService.VpnNetworkException {
+    protected void forwardPacket(DatagramPacket outPacket, IpPacket parsedPacket, AbstractDnsServer dnsServer) throws DaedalusVpnService.VpnNetworkException {
         Socket dnsSocket;
         try {
             // Packets to be sent to the real DNS server will need to be protected from the VPN
@@ -131,7 +131,7 @@ public class TcpProvider extends UdpProvider {
 
             service.protect(dnsSocket);
 
-            SocketAddress address = new InetSocketAddress(outPacket.getAddress(), DNSServerHelper.getPortOrDefault(outPacket.getAddress(), outPacket.getPort()));
+            SocketAddress address = new InetSocketAddress(outPacket.getAddress(), dnsServer.getPort());
             dnsSocket.connect(address, 5000);
             dnsSocket.setSoTimeout(5000);
             Logger.info("TcpProvider: Sending DNS query request");
@@ -161,7 +161,7 @@ public class TcpProvider extends UdpProvider {
         try {
             DataInputStream stream = new DataInputStream(dnsSocket.getInputStream());
             int length = stream.readUnsignedShort();
-            Log.d(TAG, "Reading length: " + String.valueOf(length));
+            Log.d(TAG, "Reading length: " + length);
             byte[] data = new byte[length];
             stream.read(data);
             dnsSocket.close();

app/src/main/java/org/itxtech/daedalus/provider/TlsProvider.java

@@ -3,7 +3,7 @@ package org.itxtech.daedalus.provider;
 import android.os.ParcelFileDescriptor;
 import org.itxtech.daedalus.service.DaedalusVpnService;
 import org.itxtech.daedalus.util.Logger;
-import org.itxtech.daedalus.util.server.DNSServerHelper;
+import org.itxtech.daedalus.server.AbstractDnsServer;
 import org.pcap4j.packet.IpPacket;
 
 import javax.net.ssl.SSLContext;
@@ -28,13 +28,12 @@ public class TlsProvider extends TcpProvider{
     }
 
     @Override
-    protected void forwardPacket(DatagramPacket outPacket, IpPacket parsedPacket) {
+    protected void forwardPacket(DatagramPacket outPacket, IpPacket parsedPacket, AbstractDnsServer dnsServer) {
         Socket dnsSocket;
         try {
             SSLContext context = SSLContext.getInstance("TLSv1.2");
             context.init(null, null, null);
-            dnsSocket = context.getSocketFactory().createSocket(outPacket.getAddress(),
-                    DNSServerHelper.getPortOrDefault(outPacket.getAddress(), outPacket.getPort()));
+            dnsSocket = context.getSocketFactory().createSocket(outPacket.getAddress(), dnsServer.getPort());
             //Create TLS v1.2 socket
             //TODO: SNI
 

app/src/main/java/org/itxtech/daedalus/provider/UdpProvider.java

@@ -9,7 +9,7 @@ import androidx.annotation.NonNull;
 import org.itxtech.daedalus.Daedalus;
 import org.itxtech.daedalus.service.DaedalusVpnService;
 import org.itxtech.daedalus.util.Logger;
-import org.itxtech.daedalus.util.server.DNSServerHelper;
+import org.itxtech.daedalus.server.AbstractDnsServer;
 import org.minidns.dnsmessage.DnsMessage;
 import org.pcap4j.packet.IpPacket;
 import org.pcap4j.packet.IpSelector;
@@ -118,7 +118,7 @@ public class UdpProvider extends Provider {
         }
     }
 
-    protected void forwardPacket(DatagramPacket outPacket, IpPacket parsedPacket) throws DaedalusVpnService.VpnNetworkException {
+    protected void forwardPacket(DatagramPacket outPacket, IpPacket parsedPacket, AbstractDnsServer dnsServer) throws DaedalusVpnService.VpnNetworkException {
         DatagramSocket dnsSocket;
         try {
             // Packets to be sent to the real DNS server will need to be protected from the VPN
@@ -158,7 +158,6 @@ public class UdpProvider extends Provider {
      */
     @Override
     protected void handleDnsRequest(byte[] packetData) throws DaedalusVpnService.VpnNetworkException {
-
         IpPacket parsedPacket;
         try {
             parsedPacket = (IpPacket) IpSelector.newPacket(packetData, 0, packetData.length);
@@ -168,15 +167,21 @@ public class UdpProvider extends Provider {
         }
 
         if (!(parsedPacket.getPayload() instanceof UdpPacket)) {
-            Log.i(TAG, "handleDnsRequest: Discarding unknown packet type " + parsedPacket.getPayload());
+            try {
+                Logger.debug("handleDnsRequest: Discarding unknown packet type " + parsedPacket.getPayload());
+            } catch (Exception ignored) {
+            }
             return;
         }
 
         InetAddress destAddr = parsedPacket.getHeader().getDstAddr();
-        if (destAddr == null)
+        if (destAddr == null) {
             return;
+        }
+        AbstractDnsServer dnsServer;
         try {
-            destAddr = InetAddress.getByName(service.dnsServers.get(destAddr.getHostAddress()));
+            dnsServer = service.dnsServers.get(destAddr.getHostAddress());
+            destAddr = InetAddress.getByName(dnsServer.getHostAddress());
         } catch (Exception e) {
             Logger.logException(e);
             Logger.error("handleDnsRequest: DNS server alias query failed for " + destAddr.getHostAddress());
@@ -191,9 +196,8 @@ public class UdpProvider extends Provider {
             // Let's be nice to Firefox. Firefox uses an empty UDP packet to
             // the gateway to reduce the RTT. For further details, please see
             // https://bugzilla.mozilla.org/show_bug.cgi?id=888268
-            DatagramPacket outPacket = new DatagramPacket(new byte[0], 0, 0, destAddr,
-                    DNSServerHelper.getPortOrDefault(destAddr, parsedUdp.getHeader().getDstPort().valueAsInt()));
-            forwardPacket(outPacket, null);
+            DatagramPacket outPacket = new DatagramPacket(new byte[0], 0, 0, destAddr, dnsServer.getPort());
+            forwardPacket(outPacket, null, dnsServer);
             return;
         }
 
@@ -209,14 +213,13 @@ public class UdpProvider extends Provider {
             return;
         }
         if (dnsMsg.getQuestion() == null) {
-            Log.i(TAG, "handleDnsRequest: Discarding DNS packet with no query " + dnsMsg);
+            Logger.debug("handleDnsRequest: Discarding DNS packet with no query " + dnsMsg);
             return;
         }
 
         if (!resolve(parsedPacket, dnsMsg)) {
-            DatagramPacket outPacket = new DatagramPacket(dnsRawData, 0, dnsRawData.length, destAddr,
-                    DNSServerHelper.getPortOrDefault(destAddr, parsedUdp.getHeader().getDstPort().valueAsInt()));
-            forwardPacket(outPacket, parsedPacket);
+            DatagramPacket outPacket = new DatagramPacket(dnsRawData, 0, dnsRawData.length, destAddr, dnsServer.getPort());
+            forwardPacket(outPacket, parsedPacket, dnsServer);
         }
     }
 

app/src/main/java/org/itxtech/daedalus/receiver/BootBroadcastReceiver.java

@@ -21,7 +21,7 @@ public class BootBroadcastReceiver extends BroadcastReceiver {
     @Override
     public void onReceive(Context context, Intent intent) {
         if (Daedalus.getPrefs().getBoolean("settings_boot", false)) {
-            Daedalus.activateService(context);
+            Daedalus.activateService(context, true);
             Logger.info("Triggered boot receiver");
         }
     }

app/src/main/java/org/itxtech/daedalus/server/AbstractDnsServer.java

@@ -1,4 +1,6 @@
-package org.itxtech.daedalus.util.server;
+package org.itxtech.daedalus.server;
+
+import androidx.annotation.NonNull;
 
 /**
  * Daedalus Project
@@ -11,17 +13,26 @@ package org.itxtech.daedalus.util.server;
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
  */
-public class AbstractDNSServer {
+public class AbstractDnsServer implements Cloneable {
     public static final int DNS_SERVER_DEFAULT_PORT = 53;
 
     protected String address;
     protected int port;
+    protected String hostAddress;
 
-    public AbstractDNSServer(String address, int port) {
+    public AbstractDnsServer(String address, int port) {
         this.address = address;
         this.port = port;
     }
 
+    public void setHostAddress(String hostAddress) {
+        this.hostAddress = hostAddress;
+    }
+
+    public String getHostAddress() {
+        return hostAddress;
+    }
+
     public void setAddress(String address) {
         this.address = address;
     }
@@ -54,4 +65,14 @@ public class AbstractDNSServer {
     public boolean isHttpsServer() {
         return address.contains("/");
     }
+
+    @NonNull
+    @Override
+    public Object clone() {
+        try {
+            return super.clone();
+        } catch (Exception ignored) {
+        }
+        return new AbstractDnsServer("", 0);
+    }
 }

app/src/main/java/org/itxtech/daedalus/server/CustomDnsServer.java

@@ -1,4 +1,4 @@
-package org.itxtech.daedalus.util.server;
+package org.itxtech.daedalus.server;
 
 import org.itxtech.daedalus.Daedalus;
 
@@ -13,11 +13,11 @@ import org.itxtech.daedalus.Daedalus;
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
  */
-public class CustomDNSServer extends AbstractDNSServer {
+public class CustomDnsServer extends AbstractDnsServer {
     private String name;
     private String id;
 
-    public CustomDNSServer(String name, String address, int port) {
+    public CustomDnsServer(String name, String address, int port) {
         super(address, port);
         this.name = name;
         this.id = String.valueOf(Daedalus.configurations.getNextDnsId());

app/src/main/java/org/itxtech/daedalus/server/DnsServer.java

@@ -1,4 +1,4 @@
-package org.itxtech.daedalus.util.server;
+package org.itxtech.daedalus.server;
 
 import android.content.Context;
 import org.itxtech.daedalus.Daedalus;
@@ -14,23 +14,27 @@ import org.itxtech.daedalus.Daedalus;
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
  */
-public class DNSServer extends AbstractDNSServer {
+public class DnsServer extends AbstractDnsServer {
 
     private static int totalId = 0;
 
     private String id;
-    private int description = 0;
+    private int description;
 
-    public DNSServer(String address, int description, int port) {
+    public DnsServer(String address, int description, int port) {
         super(address, port);
         this.id = String.valueOf(totalId++);
         this.description = description;
     }
 
-    public DNSServer(String address, int description) {
+    public DnsServer(String address, int description) {
         this(address, description, DNS_SERVER_DEFAULT_PORT);
     }
 
+    public DnsServer(String address) {
+        this(address, 0);
+    }
+
     public String getId() {
         return id;
     }

app/src/main/java/org/itxtech/daedalus/server/DnsServerHelper.java

@@ -1,4 +1,4 @@
-package org.itxtech.daedalus.util.server;
+package org.itxtech.daedalus.server;
 
 import android.content.Context;
 import android.net.Uri;
@@ -25,31 +25,19 @@ import java.util.List;
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
  */
-public class DNSServerHelper {
-    private static HashMap<String, Integer> portCache = new HashMap<>();
+public class DnsServerHelper {
     public static HashMap<String, List<InetAddress>> domainCache = new HashMap<>();
 
     public static void clearCache() {
-        portCache = new HashMap<>();
         domainCache = new HashMap<>();
     }
 
     public static void buildCache() {
         domainCache = new HashMap<>();
-        portCache = new HashMap<>();
-
         if (ProviderPicker.getDnsQueryMethod() >= ProviderPicker.DNS_QUERY_METHOD_HTTPS_IETF &&
-                !Daedalus.getPrefs().getBoolean("settings_dont_build_doh_cache", false)) {
-            buildDomainCache(getAddressById(getPrimary()));
-            buildDomainCache(getAddressById(getSecondary()));
-        }
-
-        for (DNSServer server : Daedalus.DNS_SERVERS) {
-            portCache.put(server.getAddress(), server.getPort());
-        }
-
-        for (CustomDNSServer server : Daedalus.configurations.getCustomDNSServers()) {
-            portCache.put(server.getAddress(), server.getPort());
+                !Daedalus.getPrefs().getBoolean("settings_dont_build_cache", false)) {
+            buildDomainCache(getServerById(getPrimary()).getAddress());
+            buildDomainCache(getServerById(getSecondary()).getAddress());
         }
     }
 
@@ -63,16 +51,6 @@ public class DNSServerHelper {
         }
     }
 
-    public static int getPortOrDefault(InetAddress address, int defaultPort) {
-        String hostAddress = address.getHostAddress();
-
-        if (portCache.containsKey(hostAddress)) {
-            return portCache.get(hostAddress);
-        }
-
-        return defaultPort;
-    }
-
     public static int getPosition(String id) {
         int intId = Integer.parseInt(id);
         if (intId < Daedalus.DNS_SERVERS.size()) {
@@ -88,18 +66,18 @@ public class DNSServerHelper {
     }
 
     public static String getPrimary() {
-        return String.valueOf(DNSServerHelper.checkServerId(Integer.parseInt(Daedalus.getPrefs().getString("primary_server", "0"))));
+        return String.valueOf(DnsServerHelper.checkServerId(Integer.parseInt(Daedalus.getPrefs().getString("primary_server", "0"))));
     }
 
     public static String getSecondary() {
-        return String.valueOf(DNSServerHelper.checkServerId(Integer.parseInt(Daedalus.getPrefs().getString("secondary_server", "1"))));
+        return String.valueOf(DnsServerHelper.checkServerId(Integer.parseInt(Daedalus.getPrefs().getString("secondary_server", "1"))));
     }
 
     private static int checkServerId(int id) {
         if (id < Daedalus.DNS_SERVERS.size()) {
             return id;
         }
-        for (CustomDNSServer server : Daedalus.configurations.getCustomDNSServers()) {
+        for (CustomDnsServer server : Daedalus.configurations.getCustomDNSServers()) {
             if (server.getId().equals(String.valueOf(id))) {
                 return id;
             }
@@ -107,26 +85,26 @@ public class DNSServerHelper {
         return 0;
     }
 
-    public static String getAddressById(String id) {
-        for (DNSServer server : Daedalus.DNS_SERVERS) {
+    public static AbstractDnsServer getServerById(String id) {
+        for (DnsServer server : Daedalus.DNS_SERVERS) {
             if (server.getId().equals(id)) {
-                return server.getAddress();
+                return server;
             }
         }
-        for (CustomDNSServer customDNSServer : Daedalus.configurations.getCustomDNSServers()) {
+        for (CustomDnsServer customDNSServer : Daedalus.configurations.getCustomDNSServers()) {
             if (customDNSServer.getId().equals(id)) {
-                return customDNSServer.getAddress();
+                return customDNSServer;
             }
         }
-        return Daedalus.DNS_SERVERS.get(0).getAddress();
+        return Daedalus.DNS_SERVERS.get(0);
     }
 
     public static String[] getIds() {
         ArrayList<String> servers = new ArrayList<>(Daedalus.DNS_SERVERS.size());
-        for (DNSServer server : Daedalus.DNS_SERVERS) {
+        for (DnsServer server : Daedalus.DNS_SERVERS) {
             servers.add(server.getId());
         }
-        for (CustomDNSServer customDNSServer : Daedalus.configurations.getCustomDNSServers()) {
+        for (CustomDnsServer customDNSServer : Daedalus.configurations.getCustomDNSServers()) {
             servers.add(customDNSServer.getId());
         }
         String[] stringServers = new String[Daedalus.DNS_SERVERS.size()];
@@ -135,30 +113,30 @@ public class DNSServerHelper {
 
     public static String[] getNames(Context context) {
         ArrayList<String> servers = new ArrayList<>(Daedalus.DNS_SERVERS.size());
-        for (DNSServer server : Daedalus.DNS_SERVERS) {
+        for (DnsServer server : Daedalus.DNS_SERVERS) {
             servers.add(server.getStringDescription(context));
         }
-        for (CustomDNSServer customDNSServer : Daedalus.configurations.getCustomDNSServers()) {
+        for (CustomDnsServer customDNSServer : Daedalus.configurations.getCustomDNSServers()) {
             servers.add(customDNSServer.getName());
         }
         String[] stringServers = new String[Daedalus.DNS_SERVERS.size()];
         return servers.toArray(stringServers);
     }
 
-    public static ArrayList<AbstractDNSServer> getAllServers() {
-        ArrayList<AbstractDNSServer> servers = new ArrayList<>(Daedalus.DNS_SERVERS.size());
+    public static ArrayList<AbstractDnsServer> getAllServers() {
+        ArrayList<AbstractDnsServer> servers = new ArrayList<>(Daedalus.DNS_SERVERS.size());
         servers.addAll(Daedalus.DNS_SERVERS);
         servers.addAll(Daedalus.configurations.getCustomDNSServers());
         return servers;
     }
 
     public static String getDescription(String id, Context context) {
-        for (DNSServer server : Daedalus.DNS_SERVERS) {
+        for (DnsServer server : Daedalus.DNS_SERVERS) {
             if (server.getId().equals(id)) {
                 return server.getStringDescription(context);
             }
         }
-        for (CustomDNSServer customDNSServer : Daedalus.configurations.getCustomDNSServers()) {
+        for (CustomDnsServer customDNSServer : Daedalus.configurations.getCustomDNSServers()) {
             if (customDNSServer.getId().equals(id)) {
                 return customDNSServer.getName();
             }
@@ -166,7 +144,7 @@ public class DNSServerHelper {
         return Daedalus.DNS_SERVERS.get(0).getStringDescription(context);
     }
 
-    public static boolean isInUsing(CustomDNSServer server) {
+    public static boolean isInUsing(CustomDnsServer server) {
         return DaedalusVpnService.isActivated() && (server.getId().equals(getPrimary()) || server.getId().equals(getSecondary()));
     }
 }

app/src/main/java/org/itxtech/daedalus/service/DaedalusVpnService.java

@@ -4,14 +4,18 @@ import android.app.Notification;
 import android.app.NotificationChannel;
 import android.app.NotificationManager;
 import android.app.PendingIntent;
+import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
+import android.content.IntentFilter;
 import android.content.pm.PackageManager;
+import android.net.ConnectivityManager;
 import android.net.VpnService;
 import android.os.Build;
 import android.os.ParcelFileDescriptor;
 import android.system.OsConstants;
 import android.util.Log;
+import androidx.appcompat.app.AlertDialog;
 import androidx.core.app.NotificationCompat;
 import org.itxtech.daedalus.Daedalus;
 import org.itxtech.daedalus.R;
@@ -19,9 +23,12 @@ import org.itxtech.daedalus.activity.MainActivity;
 import org.itxtech.daedalus.provider.Provider;
 import org.itxtech.daedalus.provider.ProviderPicker;
 import org.itxtech.daedalus.receiver.StatusBarBroadcastReceiver;
+import org.itxtech.daedalus.server.AbstractDnsServer;
+import org.itxtech.daedalus.server.DnsServer;
+import org.itxtech.daedalus.server.DnsServerHelper;
+import org.itxtech.daedalus.util.DnsServersDetector;
 import org.itxtech.daedalus.util.Logger;
 import org.itxtech.daedalus.util.RuleResolver;
-import org.itxtech.daedalus.util.server.DNSServerHelper;
 
 import java.net.Inet4Address;
 import java.net.Inet6Address;
@@ -51,30 +58,71 @@ public class DaedalusVpnService extends VpnService implements Runnable {
     private static final String CHANNEL_ID = "daedalus_channel_1";
     private static final String CHANNEL_NAME = "daedalus_channel";
 
-    public static String primaryServer;
-    public static String secondaryServer;
+    public static AbstractDnsServer primaryServer;
+    public static AbstractDnsServer secondaryServer;
+    private static InetAddress aliasPrimary;
+    private static InetAddress aliasSecondary;
 
     private NotificationCompat.Builder notification = null;
-
     private boolean running = false;
     private long lastUpdate = 0;
     private boolean statisticQuery;
     private Provider provider;
     private ParcelFileDescriptor descriptor;
-
     private Thread mThread = null;
-
-    public HashMap<String, String> dnsServers;
-
+    public HashMap<String, AbstractDnsServer> dnsServers;
     private static boolean activated = false;
+    private static BroadcastReceiver receiver;
 
     public static boolean isActivated() {
         return activated;
     }
 
+    private static int getPendingIntent(int flag) {
+        return Build.VERSION.SDK_INT >= Build.VERSION_CODES.M ? PendingIntent.FLAG_IMMUTABLE | flag : flag;
+    }
+
     @Override
     public void onCreate() {
         super.onCreate();
+        if (Daedalus.getPrefs().getBoolean("settings_use_system_dns", false)) {
+            registerReceiver(receiver = new BroadcastReceiver() {
+                @Override
+                public void onReceive(Context context, Intent intent) {
+                    updateUpstreamServers(context);
+                }
+            }, new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
+        }
+    }
+
+    private static void updateUpstreamServers(Context context) {
+        String[] servers = DnsServersDetector.getServers(context);
+        if (servers != null) {
+            if (servers.length >= 2 && (aliasPrimary == null || !aliasPrimary.getHostAddress().equals(servers[0])) &&
+                    (aliasSecondary == null || !aliasSecondary.getHostAddress().equals(servers[0])) &&
+                    (aliasPrimary == null || !aliasPrimary.getHostAddress().equals(servers[1])) &&
+                    (aliasSecondary == null || !aliasSecondary.getHostAddress().equals(servers[1]))) {
+                primaryServer.setAddress(servers[0]);
+                primaryServer.setPort(DnsServer.DNS_SERVER_DEFAULT_PORT);
+                secondaryServer.setAddress(servers[1]);
+                secondaryServer.setPort(DnsServer.DNS_SERVER_DEFAULT_PORT);
+            } else if ((aliasPrimary == null || !aliasPrimary.getHostAddress().equals(servers[0])) &&
+                    (aliasSecondary == null || !aliasSecondary.getHostAddress().equals(servers[0]))) {
+                primaryServer.setAddress(servers[0]);
+                primaryServer.setPort(DnsServer.DNS_SERVER_DEFAULT_PORT);
+                secondaryServer.setAddress(servers[0]);
+                secondaryServer.setPort(DnsServer.DNS_SERVER_DEFAULT_PORT);
+            } else {
+                StringBuilder buf = new StringBuilder();
+                for (String server : servers) {
+                    buf.append(server).append(" ");
+                }
+                Logger.error("Invalid upstream DNS " + buf);
+            }
+            Logger.info("Upstream DNS updated: " + primaryServer.getAddress() + " " + secondaryServer.getAddress());
+        } else {
+            Logger.error("Cannot obtain upstream DNS server!");
+        }
     }
 
     @Override
@@ -84,7 +132,6 @@ public class DaedalusVpnService extends VpnService implements Runnable {
                 case ACTION_ACTIVATE:
                     activated = true;
                     if (Daedalus.getPrefs().getBoolean("settings_notification", true)) {
-
                         NotificationManager manager = (NotificationManager) this.getSystemService(Context.NOTIFICATION_SERVICE);
 
                         NotificationCompat.Builder builder;
@@ -101,7 +148,7 @@ public class DaedalusVpnService extends VpnService implements Runnable {
                         Intent settingsIntent = new Intent(StatusBarBroadcastReceiver.STATUS_BAR_BTN_SETTINGS_CLICK_ACTION);
                         settingsIntent.setClass(this, StatusBarBroadcastReceiver.class);
                         PendingIntent pIntent = PendingIntent.getActivity(this, 0,
-                                new Intent(this, MainActivity.class), PendingIntent.FLAG_UPDATE_CURRENT);
+                                new Intent(this, MainActivity.class), getPendingIntent(PendingIntent.FLAG_UPDATE_CURRENT));
                         builder.setWhen(0)
                                 .setContentTitle(getResources().getString(R.string.notice_activated))
                                 .setDefaults(NotificationCompat.DEFAULT_LIGHTS)
@@ -113,10 +160,10 @@ public class DaedalusVpnService extends VpnService implements Runnable {
                                 .setContentIntent(pIntent)
                                 .addAction(R.drawable.ic_clear, getResources().getString(R.string.button_text_deactivate),
                                         PendingIntent.getBroadcast(this, 0,
-                                                deactivateIntent, PendingIntent.FLAG_UPDATE_CURRENT))
+                                                deactivateIntent, getPendingIntent(PendingIntent.FLAG_UPDATE_CURRENT)))
                                 .addAction(R.drawable.ic_settings, getResources().getString(R.string.action_settings),
                                         PendingIntent.getBroadcast(this, 0,
-                                                settingsIntent, PendingIntent.FLAG_UPDATE_CURRENT));
+                                                settingsIntent, getPendingIntent(PendingIntent.FLAG_UPDATE_CURRENT)));
 
                         Notification notification = builder.build();
 
@@ -126,12 +173,7 @@ public class DaedalusVpnService extends VpnService implements Runnable {
                     }
 
                     Daedalus.initRuleResolver();
-
-                    if (this.mThread == null) {
-                        this.mThread = new Thread(this, "DaedalusVpn");
-                        this.running = true;
-                        this.mThread.start();
-                    }
+                    startThread();
                     Daedalus.updateShortcut(getApplicationContext());
                     if (MainActivity.getInstance() != null) {
                         MainActivity.getInstance().startActivity(new Intent(getApplicationContext(), MainActivity.class)
@@ -146,9 +188,21 @@ public class DaedalusVpnService extends VpnService implements Runnable {
         return START_NOT_STICKY;
     }
 
+    private void startThread() {
+        if (this.mThread == null) {
+            this.mThread = new Thread(this, "DaedalusVpn");
+            this.running = true;
+            this.mThread.start();
+        }
+    }
+
     @Override
     public void onDestroy() {
         stopThread();
+        if (receiver != null) {
+            unregisterReceiver(receiver);
+            receiver = null;
+        }
     }
 
     private void stopThread() {
@@ -185,7 +239,7 @@ public class DaedalusVpnService extends VpnService implements Runnable {
 
         if (shouldRefresh) {
             RuleResolver.clear();
-            DNSServerHelper.clearCache();
+            DnsServerHelper.clearCache();
             Logger.info("Daedalus VPN service has stopped");
         }
 
@@ -202,27 +256,30 @@ public class DaedalusVpnService extends VpnService implements Runnable {
         stopThread();
     }
 
-    private InetAddress addDnsServer(Builder builder, String format, byte[] ipv6Template, String addr) throws UnknownHostException {
+    private InetAddress addDnsServer(Builder builder, String format, byte[] ipv6Template, AbstractDnsServer addr)
+            throws UnknownHostException {
         int size = dnsServers.size();
         size++;
-        if (addr.contains("/")) {//https uri
+        if (addr.getAddress().contains("/")) {//https uri
             String alias = String.format(format, size + 1);
             dnsServers.put(alias, addr);
             builder.addRoute(alias, 32);
             return InetAddress.getByName(alias);
         }
-        InetAddress address = InetAddress.getByName(addr);
+        InetAddress address = InetAddress.getByName(addr.getAddress());
         if (address instanceof Inet6Address && ipv6Template == null) {
             Log.i(TAG, "addDnsServer: Ignoring DNS server " + address);
         } else if (address instanceof Inet4Address) {
             String alias = String.format(format, size + 1);
-            dnsServers.put(alias, address.getHostAddress());
+            addr.setHostAddress(address.getHostAddress());
+            dnsServers.put(alias, addr);
             builder.addRoute(alias, 32);
             return InetAddress.getByName(alias);
         } else if (address instanceof Inet6Address) {
             ipv6Template[ipv6Template.length - 1] = (byte) (size + 1);
             InetAddress i6addr = Inet6Address.getByAddress(ipv6Template);
-            dnsServers.put(i6addr.getHostAddress(), address.getHostAddress());
+            addr.setHostAddress(address.getHostAddress());
+            dnsServers.put(i6addr.getHostAddress(), addr);
             return i6addr;
         }
         return null;
@@ -231,14 +288,13 @@ public class DaedalusVpnService extends VpnService implements Runnable {
     @Override
     public void run() {
         try {
-            DNSServerHelper.buildCache();
+            DnsServerHelper.buildCache();
             Builder builder = new Builder()
                     .setSession("Daedalus")
                     .setConfigureIntent(PendingIntent.getActivity(this, 0,
                             new Intent(this, MainActivity.class).putExtra(MainActivity.LAUNCH_FRAGMENT, MainActivity.FRAGMENT_SETTINGS),
-                            PendingIntent.FLAG_ONE_SHOT));
+                            getPendingIntent(PendingIntent.FLAG_ONE_SHOT)));
 
-            //Set App Filter
             if (Daedalus.getPrefs().getBoolean("settings_app_filter_switch", false)) {
                 ArrayList<String> apps = Daedalus.configurations.getAppObjects();
                 if (apps.size() > 0) {
@@ -275,36 +331,28 @@ public class DaedalusVpnService extends VpnService implements Runnable {
             statisticQuery = Daedalus.getPrefs().getBoolean("settings_count_query_times", false);
             byte[] ipv6Template = new byte[]{32, 1, 13, (byte) (184 & 0xFF), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
 
-            if (primaryServer.contains(":") || secondaryServer.contains(":")) {//IPv6
-                try {
-                    InetAddress addr = Inet6Address.getByAddress(ipv6Template);
-                    Log.d(TAG, "configure: Adding IPv6 address" + addr);
-                    builder.addAddress(addr, 120);
-                } catch (Exception e) {
-                    Logger.logException(e);
+            try {
+                InetAddress addr = Inet6Address.getByAddress(ipv6Template);
+                Log.d(TAG, "configure: Adding IPv6 address" + addr);
+                builder.addAddress(addr, 120);
+            } catch (Exception e) {
+                Logger.logException(e);
 
-                    ipv6Template = null;
-                }
-            } else {
                 ipv6Template = null;
             }
 
-            InetAddress aliasPrimary;
-            InetAddress aliasSecondary;
             if (advanced) {
                 dnsServers = new HashMap<>();
                 aliasPrimary = addDnsServer(builder, format, ipv6Template, primaryServer);
                 aliasSecondary = addDnsServer(builder, format, ipv6Template, secondaryServer);
             } else {
-                aliasPrimary = InetAddress.getByName(primaryServer);
-                aliasSecondary = InetAddress.getByName(secondaryServer);
+                aliasPrimary = InetAddress.getByName(primaryServer.getAddress());
+                aliasSecondary = InetAddress.getByName(secondaryServer.getAddress());
             }
 
-            InetAddress primaryDNSServer = aliasPrimary;
-            InetAddress secondaryDNSServer = aliasSecondary;
-            Logger.info("Daedalus VPN service is listening on " + primaryServer + " as " + primaryDNSServer.getHostAddress());
-            Logger.info("Daedalus VPN service is listening on " + secondaryServer + " as " + secondaryDNSServer.getHostAddress());
-            builder.addDnsServer(primaryDNSServer).addDnsServer(secondaryDNSServer);
+            Logger.info("Daedalus VPN service is listening on " + primaryServer.getAddress() + " as " + aliasPrimary.getHostAddress());
+            Logger.info("Daedalus VPN service is listening on " + secondaryServer.getAddress() + " as " + aliasSecondary.getHostAddress());
+            builder.addDnsServer(aliasPrimary).addDnsServer(aliasSecondary);
 
             if (advanced) {
                 builder.setBlocking(true);
@@ -324,13 +372,17 @@ public class DaedalusVpnService extends VpnService implements Runnable {
                     Thread.sleep(1000);
                 }
             }
-        } catch (
-                InterruptedException ignored) {
-        } catch (
-                Exception e) {
+        } catch (InterruptedException ignored) {
+        } catch (Exception e) {
+            MainActivity.getInstance().runOnUiThread(() ->
+                    new AlertDialog.Builder(MainActivity.getInstance())
+                            .setTitle(R.string.error_occurred)
+                            .setMessage(Logger.getExceptionMessage(e))
+                            .setPositiveButton(android.R.string.ok, (d, id) -> {
+                            })
+                            .show());
             Logger.logException(e);
         } finally {
-            Log.d(TAG, "quit");
             stopThread();
         }
     }
@@ -346,14 +398,13 @@ public class DaedalusVpnService extends VpnService implements Runnable {
         if (time - lastUpdate >= 1000) {
             lastUpdate = time;
             if (notification != null) {
-                notification.setContentTitle(getResources().getString(R.string.notice_queries) + " " + String.valueOf(provider.getDnsQueryTimes()));
+                notification.setContentTitle(getResources().getString(R.string.notice_queries) + " " + provider.getDnsQueryTimes());
                 NotificationManager manager = (NotificationManager) this.getSystemService(Context.NOTIFICATION_SERVICE);
                 manager.notify(NOTIFICATION_ACTIVATED, notification.build());
             }
         }
     }
 
-
     public static class VpnNetworkException extends Exception {
         public VpnNetworkException(String s) {
             super(s);
@@ -362,7 +413,5 @@ public class DaedalusVpnService extends VpnService implements Runnable {
         public VpnNetworkException(String s, Throwable t) {
             super(s, t);
         }
-
     }
-
 }

app/src/main/java/org/itxtech/daedalus/util/Configurations.java

@@ -3,7 +3,7 @@ package org.itxtech.daedalus.util;
 import com.google.gson.Gson;
 import com.google.gson.stream.JsonReader;
 import org.itxtech.daedalus.Daedalus;
-import org.itxtech.daedalus.util.server.CustomDNSServer;
+import org.itxtech.daedalus.server.CustomDnsServer;
 
 import java.io.File;
 import java.io.FileReader;
@@ -27,7 +27,7 @@ public class Configurations {
 
     private static File file;
 
-    private ArrayList<CustomDNSServer> customDNSServers;
+    private ArrayList<CustomDnsServer> customDNSServers;
     private ArrayList<String> appObjects;
 
     private ArrayList<Rule> hostsRules;
@@ -60,7 +60,7 @@ public class Configurations {
         this.activateCounter = activateCounter;
     }
 
-    public ArrayList<CustomDNSServer> getCustomDNSServers() {
+    public ArrayList<CustomDnsServer> getCustomDNSServers() {
         if (customDNSServers == null) {
             customDNSServers = new ArrayList<>();
         }

app/src/main/java/org/itxtech/daedalus/util/DnsServersDetector.java

@@ -0,0 +1,166 @@
+package org.itxtech.daedalus.util;
+
+import android.content.Context;
+import android.net.*;
+import android.os.Build;
+
+import java.io.BufferedReader;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.LineNumberReader;
+import java.lang.reflect.Method;
+import java.net.InetAddress;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+/**
+ * Daedalus Project
+ *
+ * @author iTX Technologies
+ * @link https://itxtech.org
+ * <p>
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ */
+public class DnsServersDetector {
+    //https://stackoverflow.com/a/48973823
+    private static final String METHOD_EXEC_PROP_DELIM = "]: [";
+
+    public static String[] getServers(Context context) {
+        String[] result;
+        result = getServersMethodSystemProperties();
+        if (result != null && result.length > 0) {
+            return result;
+        }
+        result = getServersMethodConnectivityManager(context);
+        if (result != null && result.length > 0) {
+            return result;
+        }
+        result = getServersMethodExec();
+        if (result != null && result.length > 0) {
+            return result;
+        }
+        return null;
+    }
+
+    private static String[] getServersMethodConnectivityManager(Context context) {
+        ArrayList<String> priorityServersArrayList = new ArrayList<>();
+        ArrayList<String> serversArrayList = new ArrayList<>();
+        ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
+        if (connectivityManager != null) {
+            for (Network network : connectivityManager.getAllNetworks()) {
+                NetworkInfo networkInfo = connectivityManager.getNetworkInfo(network);
+                if (networkInfo.isConnected()) {
+                    LinkProperties linkProperties = connectivityManager.getLinkProperties(network);
+                    List<InetAddress> dnsServersList = linkProperties.getDnsServers();
+                    if (linkPropertiesHasDefaultRoute(linkProperties)) {
+                        for (InetAddress element : dnsServersList) {
+                            String dnsHost = element.getHostAddress();
+                            priorityServersArrayList.add(dnsHost);
+                        }
+                    } else {
+                        for (InetAddress element : dnsServersList) {
+                            String dnsHost = element.getHostAddress();
+                            serversArrayList.add(dnsHost);
+                        }
+                    }
+                }
+            }
+        }
+        if (priorityServersArrayList.isEmpty()) {
+            priorityServersArrayList.addAll(serversArrayList);
+        }
+        if (priorityServersArrayList.size() > 0) {
+            return priorityServersArrayList.toArray(new String[0]);
+        }
+        return null;
+    }
+
+    private static String[] getServersMethodSystemProperties() {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O) {
+            String re1 = "^\\d+(\\.\\d+){3}$";
+            String re2 = "^[0-9a-f]+(:[0-9a-f]*)+:[0-9a-f]+$";
+            ArrayList<String> serversArrayList = new ArrayList<>();
+            try {
+                Class SystemProperties = Class.forName("android.os.SystemProperties");
+                Method method = SystemProperties.getMethod("get", new Class[]{String.class});
+                String[] netdns = new String[]{"net.dns1", "net.dns2", "net.dns3", "net.dns4"};
+                for (String dns : netdns) {
+                    Object[] args = new Object[]{dns};
+                    String v = (String) method.invoke(null, args);
+                    if (v != null && (v.matches(re1) || v.matches(re2)) && !serversArrayList.contains(v)) {
+                        serversArrayList.add(v);
+                    }
+                }
+                if (serversArrayList.size() > 0) {
+                    return serversArrayList.toArray(new String[0]);
+                }
+            } catch (Exception ex) {
+                Logger.logException(ex);
+            }
+        }
+        return null;
+    }
+
+    private static String[] getServersMethodExec() {
+        try {
+            Process process = Runtime.getRuntime().exec("getprop");
+            InputStream inputStream = process.getInputStream();
+            LineNumberReader lineNumberReader = new LineNumberReader(new InputStreamReader(inputStream));
+            Set<String> serversSet = methodExecParseProps(lineNumberReader);
+            if (serversSet.size() > 0) {
+                return serversSet.toArray(new String[0]);
+            }
+        } catch (Exception ex) {
+            Logger.logException(ex);
+        }
+        return null;
+    }
+
+    private static Set<String> methodExecParseProps(BufferedReader lineNumberReader) throws Exception {
+        String line;
+        HashSet<String> serversSet = new HashSet<>();
+        while ((line = lineNumberReader.readLine()) != null) {
+            int split = line.indexOf(METHOD_EXEC_PROP_DELIM);
+            if (split == -1) {
+                continue;
+            }
+            String property = line.substring(1, split);
+            int valueStart = split + METHOD_EXEC_PROP_DELIM.length();
+            int valueEnd = line.length() - 1;
+            if (valueEnd < valueStart) {
+                continue;
+            }
+            String value = line.substring(valueStart, valueEnd);
+            if (value.isEmpty()) {
+                continue;
+            }
+            if (property.endsWith(".dns") || property.endsWith(".dns1") || property.endsWith(".dns2") ||
+                    property.endsWith(".dns3") || property.endsWith(".dns4")) {
+                InetAddress ip = InetAddress.getByName(value);
+                if (ip == null) {
+                    continue;
+                }
+                value = ip.getHostAddress();
+                if (value == null || value.length() == 0) {
+                    continue;
+                }
+                serversSet.add(value);
+            }
+        }
+        return serversSet;
+    }
+
+    private static boolean linkPropertiesHasDefaultRoute(LinkProperties linkProperties) {
+        for (RouteInfo route : linkProperties.getRoutes()) {
+            if (route.isDefaultRoute()) {
+                return true;
+            }
+        }
+        return false;
+    }
+}

app/src/main/java/org/itxtech/daedalus/util/RuleResolver.java

@@ -108,7 +108,7 @@ public class RuleResolver implements Runnable {
                 for (String hostsFile : hostsFiles) {
                     File file = new File(hostsFile);
                     if (file.canRead()) {
-                        Logger.info("Loading hosts from " + file.toString());
+                        Logger.info("Loading hosts from " + file);
                         FileInputStream stream = new FileInputStream(file);
                         BufferedReader dataIO = new BufferedReader(new InputStreamReader(stream));
                         String strLine;
@@ -136,7 +136,7 @@ public class RuleResolver implements Runnable {
                 for (String dnsmasqFile : dnsmasqFiles) {
                     File file = new File(dnsmasqFile);
                     if (file.canRead()) {
-                        Logger.info("Loading DNSMasq configuration from " + file.toString());
+                        Logger.info("Loading DNSMasq configuration from " + file);
                         FileInputStream stream = new FileInputStream(file);
                         BufferedReader dataIO = new BufferedReader(new InputStreamReader(stream));
                         String strLine;
@@ -145,7 +145,12 @@ public class RuleResolver implements Runnable {
                         while ((strLine = dataIO.readLine()) != null) {
                             if (!strLine.equals("") && !strLine.startsWith("#")) {
                                 data = strLine.split("/");
-                                if (data.length == 3 && data[0].equals("address=")) {
+                                if (data.length >= 2 && data[0].equals("address=")) {
+                                    if (data.length == 2) {
+                                        rulesA.put(data[1], "0.0.0.0");
+                                        count++;
+                                        continue;
+                                    }
                                     if (data[1].startsWith(".")) {
                                         data[1] = data[1].substring(1);
                                     }
@@ -153,6 +158,8 @@ public class RuleResolver implements Runnable {
                                         rulesAAAA.put(data[1], data[2]);
                                     } else if (strLine.contains(".")) {//IPv4
                                         rulesA.put(data[1], data[2]);
+                                    } else {
+                                        rulesA.put(data[1], "0.0.0.0");
                                     }
                                     count++;
                                 }

app/src/main/java/org/itxtech/daedalus/widget/ClickPreference.java

@@ -1,7 +1,7 @@
 package org.itxtech.daedalus.widget;
 
 import android.content.Context;
-import android.preference.ListPreference;
+import androidx.preference.ListPreference;
 import android.util.AttributeSet;
 
 /**

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

@@ -25,7 +25,6 @@
         android:layout_height="match_parent"
         app:layout_behavior="@string/appbar_scrolling_view_behavior">
 
-
     </androidx.recyclerview.widget.RecyclerView>
 
-</androidx.coordinatorlayout.widget.CoordinatorLayout>
+</androidx.coordinatorlayout.widget.CoordinatorLayout>

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

@@ -1,32 +1,28 @@
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    android:layout_width="match_parent"
-    android:layout_height="wrap_content"
-    android:gravity="center_vertical">
+              android:layout_width="match_parent"
+              android:layout_height="wrap_content"
+              android:gravity="center_vertical">
 
     <androidx.appcompat.widget.AppCompatImageView
-        android:id="@+id/app_icon"
-        android:layout_width="46dp"
-        android:layout_height="46dp"
-        android:paddingEnd="10dp"
-        android:paddingLeft="14dp"
-        android:paddingRight="10dp"
-        android:paddingStart="14dp" />
+            android:id="@+id/app_icon"
+            android:layout_width="46dp"
+            android:layout_height="46dp"
+            android:paddingEnd="10dp"
+            android:paddingStart="14dp"/>
 
     <androidx.appcompat.widget.AppCompatTextView
-        android:id="@+id/app_name"
-        android:layout_width="0dp"
-        android:layout_height="wrap_content"
-        android:layout_weight="1.0" />
+            android:id="@+id/app_name"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_weight="1.0"/>
 
     <androidx.appcompat.widget.AppCompatCheckBox
-        android:id="@+id/app_check"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:clickable="false"
-        android:paddingEnd="6dp"
-        android:paddingLeft="2dp"
-        android:paddingRight="6dp"
-        android:paddingStart="2dp" />
+            android:id="@+id/app_check"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:clickable="false"
+            android:paddingEnd="6dp"
+            android:paddingStart="2dp"/>
 
-</LinearLayout>
+</LinearLayout>

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

@@ -14,47 +14,39 @@
             app:cardPreventCornerOverlap="true"
             android:id="@+id/cardView_indicator">
 
-        <LinearLayout
+        <RelativeLayout
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:focusable="true"
                 android:orientation="vertical"
-                android:background="?android:attr/selectableItemBackground">
-            <RelativeLayout
+                android:background="?android:attr/selectableItemBackground"
+                android:layout_marginStart="@dimen/margin_small">
+            <TextView
                     android:layout_width="match_parent"
                     android:layout_height="wrap_content"
-                    android:layout_marginStart="@dimen/margin_small"
-                    android:layout_marginLeft="@dimen/margin_small">
-
-                <TextView
-                        android:layout_width="match_parent"
-                        android:layout_height="wrap_content"
-                        android:padding="@dimen/margin_small"
-                        android:id="@+id/textView_rule_name"
-                        android:textAppearance="?android:attr/textAppearanceLarge"
-                        android:layout_alignParentTop="true"
-                        android:layout_alignParentLeft="true"
-                        android:layout_alignParentStart="true"/>
-                <TextView
-                        android:layout_width="match_parent"
-                        android:layout_height="wrap_content"
-                        android:layout_below="@+id/textView_rule_name"
-                        android:padding="@dimen/margin_small"
-                        android:id="@+id/textView_rule_detail"
-                        android:textAppearance="?android:attr/textAppearanceSmall"
-                        android:layout_alignParentBottom="true"
-                        android:layout_alignParentLeft="true"
-                        android:layout_alignParentStart="true"/>
-                <TextView android:id="@+id/textView_rule_size"
-                          android:layout_width="wrap_content"
-                          android:layout_height="wrap_content"
-                          android:layout_gravity="bottom"
-                          android:padding="@dimen/margin_small"
-                          android:layout_alignParentEnd="true"
-                          android:layout_alignParentRight="true"
-                          android:ellipsize="end"
-                          android:textAppearance="?android:attr/textAppearanceSmall"/>
-            </RelativeLayout>
-        </LinearLayout>
+                    android:padding="@dimen/margin_small"
+                    android:id="@+id/textView_rule_name"
+                    android:textAppearance="?android:attr/textAppearanceLarge"
+                    android:layout_alignParentTop="true"
+                    android:layout_alignParentStart="true"/>
+            <TextView
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:layout_below="@+id/textView_rule_name"
+                    android:padding="@dimen/margin_small"
+                    android:id="@+id/textView_rule_detail"
+                    android:textAppearance="?android:attr/textAppearanceSmall"
+                    android:layout_alignParentBottom="true"
+                    android:layout_alignParentStart="true"/>
+            <TextView
+                    android:id="@+id/textView_rule_size"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_gravity="bottom"
+                    android:padding="@dimen/margin_small"
+                    android:layout_alignParentEnd="true"
+                    android:ellipsize="end"
+                    android:textAppearance="?android:attr/textAppearanceSmall"/>
+        </RelativeLayout>
     </androidx.cardview.widget.CardView>
-</FrameLayout>
+</FrameLayout>

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

@@ -5,6 +5,7 @@
         android:layout_height="wrap_content"
         android:layout_width="match_parent"
         android:clickable="true"
+        android:focusable="true"
         android:foreground="?attr/selectableItemBackground"
         app:cardCornerRadius="10dp"
         app:cardPreventCornerOverlap="true"
@@ -23,7 +24,6 @@
                 android:id="@+id/textView_custom_dns_name"
                 android:textAppearance="?android:attr/textAppearanceLarge"
                 android:layout_alignParentTop="true"
-                android:layout_alignParentLeft="true"
                 android:layout_alignParentStart="true"/>
         <TextView
                 android:layout_width="match_parent"
@@ -34,8 +34,7 @@
                 android:id="@+id/textView_custom_dns_address"
                 android:textAppearance="?android:attr/textAppearanceSmall"
                 android:layout_alignParentBottom="true"
-                android:layout_alignParentLeft="true"
                 android:layout_alignParentStart="true"/>
 
     </RelativeLayout>
-</androidx.cardview.widget.CardView>
+</androidx.cardview.widget.CardView>

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

@@ -11,7 +11,6 @@
             android:layout_height="match_parent"
             android:scrollbars="horizontal"
             android:layout_alignParentTop="true"
-            android:layout_alignParentLeft="true"
             android:layout_alignParentStart="true"/>
 
     <com.google.android.material.floatingactionbutton.FloatingActionButton
@@ -23,4 +22,4 @@
             android:src="@drawable/ic_note_add"
             android:tint="#FFFFFF"/>
 
-</androidx.coordinatorlayout.widget.CoordinatorLayout>
+</androidx.coordinatorlayout.widget.CoordinatorLayout>

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

@@ -41,18 +41,15 @@
                 android:layout_alignParentStart="true"
                 android:layout_marginTop="10dp"
                 android:id="@+id/button_start_test"
-                android:layout_alignParentEnd="true"
-                android:layout_alignParentRight="true"
-                android:layout_alignParentLeft="true"/>
+                android:layout_alignParentEnd="true"/>
         <TextView
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:layout_below="@+id/button_start_test"
                 android:layout_alignParentStart="true"
-                android:layout_alignParentLeft="true"
                 android:layout_marginTop="10dp"
                 android:id="@+id/textView_test_info"
                 android:textIsSelectable="true"
                 android:textSize="18sp"/>
     </RelativeLayout>
-</ScrollView>
+</ScrollView>

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

@@ -13,7 +13,6 @@
         app:layout_behavior="@string/appbar_scrolling_view_behavior"
         tools:context="org.itxtech.daedalus.fragment.HomeFragment">
     <ImageView
-            android:contentDescription="icon"
             android:id="@+id/imageView_icon"
             android:layout_width="0dp"
             android:layout_height="0dp"
@@ -21,7 +20,7 @@
             app:srcCompat="@mipmap/ic_launcher"
             app:layout_widthPercent="40%"
             app:layout_heightPercent="20%"
-            app:layout_marginTopPercent="5%"
+            app:layout_marginTopPercent="10%"
             android:layout_alignParentTop="true" android:layout_centerHorizontal="true"/>
     <TextView
             android:text="@string/app_name"
@@ -33,21 +32,12 @@
             android:textAppearance="@android:style/TextAppearance.DeviceDefault"
             android:fontFamily="sans-serif"
             android:layout_centerHorizontal="true" android:id="@+id/textView_app_name"/>
-    <TextView
-            android:text="@string/notice_main"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:id="@+id/textView_notice"
-            app:layout_marginTopPercent="5%"
-            android:textAppearance="@android:style/TextAppearance.DeviceDefault"
-            android:fontFamily="sans-serif"
-            android:layout_below="@+id/textView_app_name" android:layout_centerHorizontal="true"/>
     <Button
             android:text="@string/button_text_activate"
             android:textSize="15sp"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:id="@+id/button_activate"
-            app:layout_marginTopPercent="10%"
-            android:layout_alignTop="@+id/textView_notice" android:layout_centerHorizontal="true"/>
+            app:layout_marginTopPercent="15%"
+            android:layout_alignTop="@+id/textView_app_name" android:layout_centerHorizontal="true"/>
 </androidx.percentlayout.widget.PercentRelativeLayout>

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

@@ -11,7 +11,6 @@
             android:layout_height="match_parent"
             android:scrollbars="horizontal"
             android:layout_alignParentTop="true"
-            android:layout_alignParentLeft="true"
             android:layout_alignParentStart="true"/>
 
     <com.google.android.material.floatingactionbutton.FloatingActionButton
@@ -23,4 +22,4 @@
             android:src="@drawable/ic_note_add"
             android:tint="#FFFFFF"/>
 
-</androidx.coordinatorlayout.widget.CoordinatorLayout>
+</androidx.coordinatorlayout.widget.CoordinatorLayout>

app/src/main/res/values-v21/styles.xml

@@ -1,20 +0,0 @@
-<resources>
-    <style name="AppTheme.NoActionBar">
-        <item name="windowActionBar">false</item>
-        <item name="windowNoTitle">true</item>
-        <item name="android:windowDrawsSystemBarBackgrounds">true</item>
-        <item name="android:navigationBarColor">@color/colorPrimaryDark</item>
-    </style>
-    <style name="AppTheme.NoActionBar.TransparentStatusBar">
-        <item name="android:statusBarColor">@android:color/transparent</item>
-    </style>
-    <style name="AppTheme.Dark.NoActionBar">
-        <item name="windowActionBar">false</item>
-        <item name="windowNoTitle">true</item>
-        <item name="android:windowDrawsSystemBarBackgrounds">true</item>
-        <item name="android:navigationBarColor">@color/colorPrimaryDark</item>
-    </style>
-    <style name="AppTheme.Dark.NoActionBar.TransparentStatusBar">
-        <item name="android:statusBarColor">@android:color/transparent</item>
-    </style>
-</resources>

app/src/main/res/values-zh-rCN/strings.xml

@@ -3,7 +3,6 @@
     <string name="app_name">Daedalus</string>
     <string name="quick_toggle">开关</string>
 
-    <string name="notice_main">世界很大，我要去看看。</string>
     <string name="notice_activated">已启用 iTXTech Daedalus。</string>
     <string name="notice_start_test">正在测试指定的 DNS 服务器……</string>
     <string name="notice_queries">DNS 查询次数:</string>
@@ -63,9 +62,11 @@
     <string name="settings_manual_summary">访问 GitHub wiki 页面。</string>
     <string name="settings_log_size">日志大小限制</string>
     <string name="settings_debug_output">调试输出</string>
-    <string name="settings_dont_build_doh_cache">不缓存 DoH DNS 的 IP地址</string>
+    <string name="settings_dont_build_cache">不缓存 DNS 的 IP地址</string>
     <string name="settings_dark_theme">使用暗主题</string>
     <string name="settings_dns_query_method">DNS 查询方式</string>
+    <string name="settings_foreground">运行前台服务</string>
+    <string name="settings_use_system_dns">使用系統DNS作為上游DNS</string>
 
     <string name="settings_rule_name">规则名称</string>
     <string name="settings_rule_type">规则类型</string>
@@ -103,4 +104,6 @@
     <string name="test_test_domain">google.com</string>
 
     <string name="nav_version">版本:</string>
+
+    <string name="error_occurred">启动时出现了一个错误</string>
 </resources>

app/src/main/res/values-zh-rTW/strings.xml

@@ -3,7 +3,6 @@
     <string name="app_name">Daedalus</string>
     <string name="quick_toggle">开关</string>
 
-    <string name="notice_main">世界很大，我要去看看。</string>
     <string name="notice_activated">已啟動 iTXTech Daedalus。</string>
     <string name="notice_start_test">正在測試指定的 DNS 伺服器……</string>
     <string name="notice_queries">DNS 查詢次數:</string>
@@ -63,7 +62,7 @@
     <string name="settings_manual_summary">造訪 GitHub wiki 頁面。</string>
     <string name="settings_log_size">紀錄檔大小限制</string>
     <string name="settings_debug_output">调试输出 TODO</string>
-    <string name="settings_dont_build_doh_cache">不緩存 DoH DNS 的 IP地址</string>
+    <string name="settings_dont_build_cache">不緩存 DNS 的 IP地址</string>
     <string name="settings_dark_theme">使用暗主题</string>
 
     <string name="settings_rule_name">規則名稱</string>
@@ -76,6 +75,7 @@
     <string name="settings_rule_import_built_in">内置</string>
     <string name="settings_rule_import_external">外部</string>
     <string name="settings_dns_query_method">DNS 查询方式</string>
+    <string name="settings_foreground">運行前臺服務</string>
 
     <string name="settings_server_name">伺服器名稱</string>
     <string name="settings_server_address">伺服器網址</string>
@@ -101,4 +101,6 @@
     <string name="test_test_domain">google.com</string>
 
     <string name="nav_version">版本:</string>
+
+    <string name="error_occurred">啟動時出現了一個錯誤</string>
 </resources>

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

@@ -2,7 +2,6 @@
     <string name="app_name">Daedalus</string>
     <string name="quick_toggle">Toggle</string>
 
-    <string name="notice_main">See the world outside.</string>
     <string name="notice_activated">iTXTech Daedalus is activated.</string>
     <string name="notice_start_test">Testing specified DNS server…</string>
     <string name="notice_queries">DNS query times:</string>
@@ -61,10 +60,12 @@
     <string name="settings_log_size">Log Size Limit</string>
     <string name="settings_manual">Manual</string>
     <string name="settings_manual_summary">Visit GitHub wiki page.</string>
-    <string name="settings_dont_build_doh_cache">Don\'t build DNS Cache for DoH DNS</string>
+    <string name="settings_dont_build_cache">Don\'t cache IP for DNS servers</string>
     <string name="settings_debug_output">Debug Output</string>
     <string name="settings_dark_theme">Use Dark Theme</string>
     <string name="settings_dns_query_method">DNS Query Method</string>
+    <string name="settings_foreground">Run service in Foreground</string>
+    <string name="settings_use_system_dns">Use System DNS as upstream DNS</string>
 
     <string name="settings_dns_tcp">TCP</string>
     <string name="settings_dns_udp">UDP</string>
@@ -111,4 +112,6 @@
     <string name="nav_version">Version:</string>
     <string name="nav_git_commit">Git commit:</string>
     <string name="nav_github">GitHub</string>
+
+    <string name="error_occurred">An error occurred at startup</string>
 </resources>

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

@@ -1,8 +1,5 @@
 <resources>
-
-    <!-- Base application theme. -->
     <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
-        <!-- Customize your theme here. -->
         <item name="colorPrimary">@color/colorPrimary</item>
         <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
         <item name="colorAccent">@color/colorAccent</item>
@@ -12,15 +9,25 @@
         <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
         <item name="colorAccent">@color/colorPrimaryLight</item>
     </style>
-    <style name="AppTheme.NoActionBar">
+    <style name="AppTheme.NoActionBar" parent="AppTheme">
         <item name="windowActionBar">false</item>
         <item name="windowNoTitle">true</item>
+        <item name="android:windowDrawsSystemBarBackgrounds">true</item>
+        <item name="android:navigationBarColor">@color/colorPrimaryDark</item>
     </style>
-    <style name="AppTheme.Dark.NoActionBar">
+    <style name="AppTheme.Dark.NoActionBar" parent="AppTheme.Dark">
         <item name="windowActionBar">false</item>
         <item name="windowNoTitle">true</item>
+        <item name="android:windowDrawsSystemBarBackgrounds">true</item>
+        <item name="android:navigationBarColor">@color/colorPrimaryDark</item>
     </style>
     <style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar"/>
     <style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light"/>
 
+    <style name="AppTheme.NoActionBar.TransparentStatusBar" parent="AppTheme.NoActionBar">
+        <item name="android:statusBarColor">@android:color/transparent</item>
+    </style>
+    <style name="AppTheme.Dark.NoActionBar.TransparentStatusBar" parent="AppTheme.Dark.NoActionBar">
+        <item name="android:statusBarColor">@android:color/transparent</item>
+    </style>
 </resources>

app/src/main/res/xml/perf_rule.xml

@@ -1,11 +1,14 @@
 <?xml version="1.0" encoding="utf-8"?>
-<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
+<androidx.preference.PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
+                                      xmlns:app="http://schemas.android.com/apk/res-auto">
     <EditTextPreference
             android:key="ruleName"
             android:selectAllOnFocus="true"
             android:singleLine="true"
             android:title="@string/settings_rule_name"/>
+
     <PreferenceCategory
+            app:iconSpaceReserved="false"
             android:key="rulSettings"
             android:title="@string/settings_rule">
         <ListPreference
@@ -27,7 +30,9 @@
                 android:key="ruleSync"
                 android:title="@string/settings_rule_sync"/>
     </PreferenceCategory>
+
     <PreferenceCategory
+            app:iconSpaceReserved="false"
             android:key="Import"
             android:title="@string/settings_rule_import">
         <ListPreference
@@ -37,4 +42,4 @@
                 android:key="ruleImportExternal"
                 android:title="@string/settings_rule_import_external"/>
     </PreferenceCategory>
-</PreferenceScreen>
+</androidx.preference.PreferenceScreen>

app/src/main/res/xml/perf_server.xml

@@ -1,11 +1,14 @@
 <?xml version="1.0" encoding="utf-8"?>
-<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
+<androidx.preference.PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
+                                      xmlns:app="http://schemas.android.com/apk/res-auto">
     <EditTextPreference
             android:key="serverName"
             android:selectAllOnFocus="true"
             android:singleLine="true"
             android:title="@string/settings_server_name"/>
+
     <PreferenceCategory
+            app:iconSpaceReserved="false"
             android:key="serverSettings"
             android:title="@string/settings_server">
         <EditTextPreference
@@ -20,4 +23,4 @@
                 android:numeric="integer"
                 android:title="@string/settings_server_port"/>
     </PreferenceCategory>
-</PreferenceScreen>
+</androidx.preference.PreferenceScreen>

app/src/main/res/xml/perf_settings.xml

@@ -1,7 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
-<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
-
+<androidx.preference.PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
+                                      xmlns:app="http://schemas.android.com/apk/res-auto">
     <PreferenceCategory
+            app:iconSpaceReserved="false"
             android:key="settingsServer"
             android:title="@string/settings_server">
 
@@ -10,7 +11,6 @@
                 android:title="@string/primary_server"
                 android:defaultValue="0">
         </ListPreference>
-
         <ListPreference
                 android:key="secondary_server"
                 android:title="@string/secondary_server"
@@ -23,7 +23,9 @@
                 android:singleLine="true"
                 android:title="@string/settings_dns_test_servers"/>
     </PreferenceCategory>
+
     <PreferenceCategory
+            app:iconSpaceReserved="false"
             android:key="settings_system"
             android:title="@string/settings_system">
 
@@ -39,6 +41,10 @@
                 android:key="settings_dark_theme"
                 android:title="@string/settings_dark_theme"
                 android:defaultValue="false"/>
+        <SwitchPreference
+                android:key="settings_foreground"
+                android:title="@string/settings_foreground"
+                android:defaultValue="false"/>
         <EditTextPreference
                 android:key="settings_log_size"
                 android:selectAllOnFocus="false"
@@ -49,25 +55,27 @@
     </PreferenceCategory>
 
     <PreferenceCategory
-        android:key="settings_app_filter"
-        android:title="@string/settings_app_filter">
+            app:iconSpaceReserved="false"
+            android:key="settings_app_filter"
+            android:title="@string/settings_app_filter">
         <SwitchPreference
-            android:key="settings_app_filter_switch"
-            android:title="@string/settings_app_filter"
-            android:defaultValue="false"/>
+                android:key="settings_app_filter_switch"
+                android:title="@string/settings_app_filter"
+                android:defaultValue="false"/>
         <SwitchPreference
-            android:key="settings_app_filter_mode_switch"
-            android:title="@string/settings_app_filter_mode"
-            android:defaultValue="false"
-            android:enabled="false"/>
+                android:key="settings_app_filter_mode_switch"
+                android:title="@string/settings_app_filter_mode"
+                android:defaultValue="false"
+                android:enabled="false"/>
         <org.itxtech.daedalus.widget.ClickPreference
-            android:key="settings_app_filter_list"
-            android:title="@string/settings_app_filter_list"
-            android:summary="@string/settings_app_filter_list_summary"
-            android:enabled="false"/>
+                android:key="settings_app_filter_list"
+                android:title="@string/settings_app_filter_list"
+                android:summary="@string/settings_app_filter_list_summary"
+                android:enabled="false"/>
     </PreferenceCategory>
 
     <PreferenceCategory
+            app:iconSpaceReserved="false"
             android:key="settings_advanced"
             android:title="@string/settings_advanced">
         <SwitchPreference
@@ -80,10 +88,14 @@
                 android:defaultValue="false"
                 android:enabled="false"/>
         <SwitchPreference
-                android:key="settings_dont_build_doh_cache"
-                android:title="@string/settings_dont_build_doh_cache"
+                android:key="settings_dont_build_cache"
+                android:title="@string/settings_dont_build_cache"
                 android:defaultValue="false"
                 android:enabled="false"/>
+        <SwitchPreference
+                android:key="settings_use_system_dns"
+                android:title="@string/settings_use_system_dns"
+                android:defaultValue="false"/>
         <ListPreference
                 android:key="settings_dns_query_method"
                 android:title="@string/settings_dns_query_method"
@@ -100,6 +112,7 @@
     </PreferenceCategory>
 
     <PreferenceCategory
+            app:iconSpaceReserved="false"
             android:key="settings_help"
             android:title="@string/settings_help_and_support">
         <org.itxtech.daedalus.widget.ClickPreference
@@ -118,4 +131,4 @@
                 android:title="@string/settings_manual"
                 android:summary="@string/settings_manual_summary"/>
     </PreferenceCategory>
-</PreferenceScreen>
+</androidx.preference.PreferenceScreen>

build.gradle

@@ -11,7 +11,7 @@ buildscript {
     dependencies {
         classpath 'com.android.tools.build:gradle:7.0.4'
         classpath 'com.google.gms:google-services:4.3.10'
-        classpath 'io.fabric.tools:gradle:1.28.1'
+        classpath 'io.fabric.tools:gradle:1.31.0'
     }
 }
 

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,5 @@
-#Wed Aug 23 01:02:45 CST 2017
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.4-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https://services.gradle.org/distributions/gradle-5.5.1-bin.zip

gradlew

@@ -1,78 +1,129 @@
-#!/usr/bin/env sh
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
 
 ##############################################################################
-##
-##  Gradle start up script for UN*X
-##
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
 ##############################################################################
 
 # Attempt to set APP_HOME
+
 # Resolve links: $0 may be a link
-PRG="$0"
-# Need this for relative symlinks.
-while [ -h "$PRG" ] ; do
-    ls=`ls -ld "$PRG"`
-    link=`expr "$ls" : '.*-> \(.*\)$'`
-    if expr "$link" : '/.*' > /dev/null; then
-        PRG="$link"
-    else
-        PRG=`dirname "$PRG"`"/$link"
-    fi
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
 done
-SAVED="`pwd`"
-cd "`dirname \"$PRG\"`/" >/dev/null
-APP_HOME="`pwd -P`"
-cd "$SAVED" >/dev/null
+
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
 
 APP_NAME="Gradle"
-APP_BASE_NAME=`basename "$0"`
+APP_BASE_NAME=${0##*/}
 
 # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-DEFAULT_JVM_OPTS=""
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
-MAX_FD="maximum"
+MAX_FD=maximum
 
-warn ( ) {
+warn () {
     echo "$*"
-}
+} >&2
 
-die ( ) {
+die () {
     echo
     echo "$*"
     echo
     exit 1
-}
+} >&2
 
 # OS specific support (must be 'true' or 'false').
 cygwin=false
 msys=false
 darwin=false
 nonstop=false
-case "`uname`" in
-  CYGWIN* )
-    cygwin=true
-    ;;
-  Darwin* )
-    darwin=true
-    ;;
-  MINGW* )
-    msys=true
-    ;;
-  NONSTOP* )
-    nonstop=true
-    ;;
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
 esac
 
 CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
 
+
 # Determine the Java command to use to start the JVM.
 if [ -n "$JAVA_HOME" ] ; then
     if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
         # IBM's JDK on AIX uses strange locations for the executables
-        JAVACMD="$JAVA_HOME/jre/sh/java"
+        JAVACMD=$JAVA_HOME/jre/sh/java
     else
-        JAVACMD="$JAVA_HOME/bin/java"
+        JAVACMD=$JAVA_HOME/bin/java
     fi
     if [ ! -x "$JAVACMD" ] ; then
         die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
@@ -81,7 +132,7 @@ Please set the JAVA_HOME variable in your environment to match the
 location of your Java installation."
     fi
 else
-    JAVACMD="java"
+    JAVACMD=java
     which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
 
 Please set the JAVA_HOME variable in your environment to match the
@@ -89,84 +140,95 @@ location of your Java installation."
 fi
 
 # Increase the maximum file descriptors if we can.
-if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
-    MAX_FD_LIMIT=`ulimit -H -n`
-    if [ $? -eq 0 ] ; then
-        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
-            MAX_FD="$MAX_FD_LIMIT"
-        fi
-        ulimit -n $MAX_FD
-        if [ $? -ne 0 ] ; then
-            warn "Could not set maximum file descriptor limit: $MAX_FD"
-        fi
-    else
-        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
-    fi
-fi
-
-# For Darwin, add options to specify how the application appears in the dock
-if $darwin; then
-    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
-fi
-
-# For Cygwin, switch paths to Windows format before running java
-if $cygwin ; then
-    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
-    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
-    JAVACMD=`cygpath --unix "$JAVACMD"`
-
-    # We build the pattern for arguments to be converted via cygpath
-    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
-    SEP=""
-    for dir in $ROOTDIRSRAW ; do
-        ROOTDIRS="$ROOTDIRS$SEP$dir"
-        SEP="|"
-    done
-    OURCYGPATTERN="(^($ROOTDIRS))"
-    # Add a user-defined pattern to the cygpath arguments
-    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
-        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
-    fi
-    # Now convert the arguments - kludge to limit ourselves to /bin/sh
-    i=0
-    for arg in "$@" ; do
-        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
-        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
-
-        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
-            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
-        else
-            eval `echo args$i`="\"$arg\""
-        fi
-        i=$((i+1))
-    done
-    case $i in
-        (0) set -- ;;
-        (1) set -- "$args0" ;;
-        (2) set -- "$args0" "$args1" ;;
-        (3) set -- "$args0" "$args1" "$args2" ;;
-        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
-        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
-        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
-        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
-        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
-        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
     esac
 fi
 
-# Escape application args
-save ( ) {
-    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
-    echo " "
-}
-APP_ARGS=$(save "$@")
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
 
-# Collect all arguments for the java command, following the shell quoting and substitution rules
-eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
 
-# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
-if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
-  cd "$(dirname "$0")"
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
 fi
 
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
 exec "$JAVACMD" "$@"

gradlew.bat

@@ -1,3 +1,19 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
 @if "%DEBUG%" == "" @echo off
 @rem ##########################################################################
 @rem
@@ -13,15 +29,18 @@ if "%DIRNAME%" == "" set DIRNAME=.
 set APP_BASE_NAME=%~n0
 set APP_HOME=%DIRNAME%
 
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
 @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-set DEFAULT_JVM_OPTS=
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
 
 @rem Find java.exe
 if defined JAVA_HOME goto findJavaFromJavaHome
 
 set JAVA_EXE=java.exe
 %JAVA_EXE% -version >NUL 2>&1
-if "%ERRORLEVEL%" == "0" goto init
+if "%ERRORLEVEL%" == "0" goto execute
 
 echo.
 echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
@@ -35,7 +54,7 @@ goto fail
 set JAVA_HOME=%JAVA_HOME:"=%
 set JAVA_EXE=%JAVA_HOME%/bin/java.exe
 
-if exist "%JAVA_EXE%" goto init
+if exist "%JAVA_EXE%" goto execute
 
 echo.
 echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
@@ -45,28 +64,14 @@ echo location of your Java installation.
 
 goto fail
 
-:init
-@rem Get command-line arguments, handling Windows variants
-
-if not "%OS%" == "Windows_NT" goto win9xME_args
-
-:win9xME_args
-@rem Slurp the command line arguments.
-set CMD_LINE_ARGS=
-set _SKIP=2
-
-:win9xME_args_slurp
-if "x%~1" == "x" goto execute
-
-set CMD_LINE_ARGS=%*
-
 :execute
 @rem Setup the command line
 
 set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
 
+
 @rem Execute Gradle
-"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
 
 :end
 @rem End local scope for the variables with windows NT shell

metadata/en-US/changelogs/21.txt

@@ -0,0 +1,5 @@
+Changes:
+* Support SDK 31
+* Support more DNSMasq rules
+* Many optimizations
+* Initial F-Droid release

metadata/en-US/full_description.txt

@@ -0,0 +1,22 @@
+This application can create a VPN tunnel to modify the DNS settings on Android.
+
+Features
+* No root access required, no ads contained
+* Functional under data connection
+* A tester for DNS servers
+* IPv6 support (including Rules!)
+* Custom DNS server
+* Custom hosts and DNSMasq configuration
+* EXTREME LOW power consume
+* Material Design
+
+Supported DNS Query Methods:
+* UDP
+* TCP
+* DNS over TLS (RFC7858)
+* DNS over HTTPS (RFC8484)
+* DNS over HTTPS (Google JSON)
+
+Users must comply with local laws and regulations.
+
+Read more: <a href="https://github.com/iTXTech/Daedalus/wiki">Wiki</a>

metadata/en-US/short_description.txt

@@ -0,0 +1 @@
+No root required Android DNS modifier and Hosts/DNSMasq resolver