1. fixed service stop

2. created layout

app/build.gradle

@@ -6,7 +6,7 @@ android {
     compileSdkVersion 29
     defaultConfig {
         applicationId "io.github.chronosx88.yggdrasil"
-        minSdkVersion 21
+        minSdkVersion 22
         targetSdkVersion 29
         versionCode 1
         versionName "1.0"

app/src/main/AndroidManifest.xml

@@ -24,10 +24,8 @@
         <activity android:name=".MainActivity">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
-
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
     </application>
-
 </manifest>

app/src/main/java/io/github/chronosx88/yggdrasil/MainActivity.kt

@@ -4,48 +4,55 @@ import android.app.Activity
 import android.content.Intent
 import android.net.VpnService
 import android.os.Bundle
-import android.widget.Button
+import android.util.Log
+import android.widget.RadioGroup
 import androidx.appcompat.app.AppCompatActivity
 
 
 class MainActivity : AppCompatActivity() {
-    private var isYggStarted = false
+    companion object {
+        private const val TAG="Yggdrasil";
+        private const val VPN_REQUEST_CODE = 0x0F
+    }
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+        val connectRadioGroup = findViewById<RadioGroup>(R.id.connectRadioGroup)
+        connectRadioGroup.setOnCheckedChangeListener(
+                RadioGroup.OnCheckedChangeListener { group, checkedId ->
+                    when (checkedId) {
+                        R.id.disconnectButton -> stopVpn()
+                        R.id.connectButton -> startVpn()
+                        else -> { // Note the block
+                            //print("x is neither 1 nor 2")
+                        }
+                    }
+                })
+    }
 
-        val connectButton = findViewById<Button>(R.id.connect_button)
-        connectButton.setOnClickListener {
-            if(!isYggStarted) {
-                // Prepare to establish a VPN connection.
-                // This method returns null if the VPN application is already prepared
-                // or if the user has previously consented to the VPN application.
-                // Otherwise, it returns an Intent to a system activity.
-                val vpnIntent = VpnService.prepare(this)
-                if (vpnIntent != null) startActivityForResult(
-                    vpnIntent,
-                    0x0F
-                )
-                else onActivityResult(0x0F, Activity.RESULT_OK, null)
-            } else {
-                // FIXME fix this shit, this code doesn't stop service for some reasons
-                val intent = Intent(this, YggdrasilTunService::class.java)
-                stopService(intent)
-                connectButton.text = "Connect"
-                isYggStarted = false
-            }
+    fun stopVpn(){
+        Log.d(TAG,"Stop")
+        val intent = Intent(this, YggdrasilTunService::class.java)
+        intent.putExtra("COMMAND", "STOP")
+        startService(intent)
+    }
+
+    fun startVpn(){
+        Log.d(TAG,"Start")
+        val intent= VpnService.prepare(this)
+        if (intent!=null){
+            startActivityForResult(intent, VPN_REQUEST_CODE);
+        }else{
+            onActivityResult(VPN_REQUEST_CODE, Activity.RESULT_OK, null);
         }
     }
 
     override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
         super.onActivityResult(requestCode, resultCode, data)
-        if (requestCode == 0x0F && resultCode == Activity.RESULT_OK) {
+        if (requestCode == VPN_REQUEST_CODE && resultCode== Activity.RESULT_OK){
             val intent = Intent(this, YggdrasilTunService::class.java)
             startService(intent)
-            val connectButton = findViewById<Button>(R.id.connect_button)
-            connectButton.text = "Disconnect"
-            isYggStarted = true
         }
     }
 }

app/src/main/java/io/github/chronosx88/yggdrasil/YggdrasilTunService.kt

@@ -1,7 +1,10 @@
 package io.github.chronosx88.yggdrasil
 
 import android.app.Service
+import android.content.Context
 import android.content.Intent
+import android.net.ConnectivityManager
+import android.net.Network
 import android.net.VpnService
 import android.os.ParcelFileDescriptor
 import com.google.gson.Gson
@@ -36,7 +39,9 @@ class YggdrasilTunService : VpnService() {
     private lateinit var writeCoroutine: CoroutineContext
 
     override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
-        super.onStartCommand(intent, flags, startId)
+        if (intent?.getStringExtra("COMMAND") == "STOP") {
+            stopVpn()
+        }
         return Service.START_STICKY
     }
 
@@ -83,6 +88,22 @@ class YggdrasilTunService : VpnService() {
         }
     }
 
+    private fun getNonVpnNetworks(Address: String): Array<Network> {
+        val cm =
+            getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
+        val networks = cm.allNetworks
+        for (network in networks) {
+            val linkProperties = cm.getLinkProperties(network)
+            val addresses = linkProperties.linkAddresses
+            for (addr in addresses) {
+                if (addr.toString().startsWith(Address)) {
+                    return arrayOf(network)
+                }
+            }
+        }
+        return emptyArray<Network>()
+    }
+
     private fun fixConfig(config: MutableMap<Any?, Any?>): MutableMap<Any?, Any?> {
         val peers = arrayListOf<String>();
         peers.add("tcp://194.177.21.156:5066")
@@ -123,28 +144,16 @@ class YggdrasilTunService : VpnService() {
             // Read the outgoing packet from the input stream.
             var length = tunInputStream!!.read(packet)
 
-            //System.out.println("packet size:"+packet.size+" "+byteArrayToHex(packet))
-            //System.out.println("buffer size:"+buffer.array().size+" "+byteArrayToHex(buffer.array()))
             if (length > 0) {
-                // Ignore control messages, which start with zero.
-                if (packet.get(0).compareTo(0)!=0) {
-                    var buffer = ByteBuffer.allocate(length);
-                    buffer.put(packet, 0, length)
-                    buffer.limit(length)
-                    yggConduitEndpoint.send(buffer.array())
-                }
+                var buffer = ByteBuffer.allocate(length);
+                buffer.put(packet, 0, length)
+                buffer.limit(length)
+                yggConduitEndpoint.send(buffer.array())
+
             }
         }
     }
 
-    private fun isBufferEmpty(buffer: ByteArray): Boolean {
-        var sum: Byte = 0
-        for (i in buffer) {
-            sum.or(i)
-        }
-        return sum == 0.toByte()
-    }
-
     private fun writePacketsToTun() {
         if(tunOutputStream != null) {
             val buffer = yggConduitEndpoint.recv()
@@ -152,12 +161,17 @@ class YggdrasilTunService : VpnService() {
         }
     }
 
-    override fun onRevoke() {
-        super.onRevoke()
+    fun stopVpn() {
         isRunning = false
         readCoroutine.cancel()
         writeCoroutine.cancel()
         tunInterface!!.close()
         tunInterface = null
+        stopSelf()
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        stopSelf()
     }
 }

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

@@ -0,0 +1,8 @@
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+        android:shape="rectangle">
+    <corners android:radius="2dp" />
+    <solid android:color="#80000000" />
+    <stroke
+            android:width="1dp"
+            android:color="@color/green" />
+</shape>

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

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="@color/pink" android:state_checked="true" />
+    <item android:drawable="@color/dark_pink" android:state_pressed="true" />
+    <item android:drawable="@color/transparent" />
+</selector>

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

@@ -1,18 +1,51 @@
-<?xml version="1.0" encoding="utf-8"?>
-<LinearLayout
+<androidx.constraintlayout.widget.ConstraintLayout
         xmlns:android="http://schemas.android.com/apk/res/android"
-        xmlns:tools="http://schemas.android.com/tools"
         xmlns:app="http://schemas.android.com/apk/res-auto"
+        xmlns:tools="http://schemas.android.com/tools"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-        tools:context=".MainActivity" android:orientation="vertical"
-        android:gravity="center">
+        android:background="@color/grey"
+        tools:context=".MainActivity">
 
-    <Button
-            android:id="@+id/connect_button"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:text="@string/connect_button"
-            android:layout_gravity="center"/>
+    <RadioGroup
+            android:id="@+id/connectRadioGroup"
+            android:layout_width="match_parent"
+            android:layout_height="60dp"
+            android:background="@drawable/pink_out_line"
+            android:checkedButton="@+id/offer"
+            android:orientation="horizontal"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:layout_constraintTop_toTopOf="parent"
+            tools:layout_editor_absoluteX="50dp">
 
-</LinearLayout>
+        <RadioButton
+                android:id="@+id/disconnectButton"
+                android:layout_width="0dp"
+                android:layout_height="match_parent"
+                android:layout_marginLeft="1dp"
+                android:layout_marginTop="1dp"
+                android:layout_marginBottom="1dp"
+                android:layout_weight="1"
+                android:background="@drawable/toggle_widget_background"
+                android:button="@null"
+                android:gravity="center"
+                android:text="@string/disconnect_button"
+                android:textColor="@color/white"
+                android:checked="true"/>
+
+        <RadioButton
+                android:id="@+id/connectButton"
+                android:layout_width="0dp"
+                android:layout_height="match_parent"
+                android:layout_marginTop="1dp"
+                android:layout_marginRight="1dp"
+                android:layout_marginBottom="1dp"
+                android:layout_weight="1"
+                android:background="@drawable/toggle_widget_background"
+                android:button="@null"
+                android:gravity="center"
+                android:text="@string/connect_button"
+                android:textColor="@color/white" />
+    </RadioGroup>
+
+</androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -1,6 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <color name="colorPrimary">#008577</color>
-    <color name="colorPrimaryDark">#00574B</color>
+    <color name="colorPrimary">#555555</color>
+    <color name="colorPrimaryDark">#343334</color>
     <color name="colorAccent">#D81B60</color>
+    <color name="white">#ffffff</color>
+    <color name="green">#83cf03</color>
+    <color name="grey">#343334</color>
+    <color name="transparent">#555555</color>
+    <color name="dark_pink">#666666</color>
+    <color name="pink">#777777</color>
 </resources>

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

@@ -1,4 +1,5 @@
 <resources>
     <string name="app_name">Yggdrasil</string>
     <string name="connect_button">Connect</string>
+    <string name="disconnect_button">Disconnect</string>
 </resources>

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

@@ -1,7 +1,7 @@
 <resources>
 
     <!-- Base application theme. -->
-    <style name="AppTheme" parent="Theme.MaterialComponents.Light">
+    <style name="AppTheme" parent="Theme.MaterialComponents.Light.DarkActionBar">
         <!-- Customize your theme here. -->
         <item name="colorPrimary">@color/colorPrimary</item>
         <item name="colorPrimaryDark">@color/colorPrimaryDark</item>