[wip] feat: Implement creating tun interface and starting yggdrasil

app/src/main/AndroidManifest.xml

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-          package="io.github.chronosx88.yggdrasil">
+        xmlns:tools="http://schemas.android.com/tools"
+        package="io.github.chronosx88.yggdrasil">
 
     <application
             android:allowBackup="true"
@@ -8,18 +9,27 @@
             android:label="@string/app_name"
             android:roundIcon="@mipmap/ic_launcher_round"
             android:supportsRtl="true"
-            android:theme="@style/AppTheme">
+            android:theme="@style/AppTheme"
+            tools:ignore="GoogleAppIndexingWarning">
+        <service
+                android:name=".YggdrasilTunService"
+                android:enabled="true"
+                android:exported="true"></service>
         <service
                 android:name=".YggdrasilService"
                 android:enabled="true"
-                android:exported="true">
+                android:exported="true"
+                android:permission="android.permission.BIND_VPN_SERVICE">
+            <intent-filter>
+                <action android:name="android.net.VpnService"/>
+            </intent-filter>
         </service>
 
         <activity android:name=".MainActivity">
             <intent-filter>
-                <action android:name="android.intent.action.MAIN"/>
+                <action android:name="android.intent.action.MAIN" />
 
-                <category android:name="android.intent.category.LAUNCHER"/>
+                <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
     </application>

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

@@ -1,12 +1,32 @@
 package io.github.chronosx88.yggdrasil
 
-import androidx.appcompat.app.AppCompatActivity
+import android.content.Intent
+import android.net.VpnService
 import android.os.Bundle
+import android.widget.Button
+import androidx.appcompat.app.AppCompatActivity
 
 class MainActivity : AppCompatActivity() {
+    private var isYggStarted = false
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+
+        val connectButton = findViewById<Button>(R.id.connect_button)
+        connectButton.setOnClickListener {
+            if(!isYggStarted) {
+                VpnService.prepare(this)
+                val intent = Intent(this, YggdrasilTunService::class.java)
+                startService(intent)
+                connectButton.text = "Disconnect"
+                isYggStarted = true
+            } else {
+                val intent = Intent(this, YggdrasilTunService::class.java)
+                stopService(intent)
+                connectButton.text = "Connect"
+                isYggStarted = false
+            }
+        }
     }
 }

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

@@ -2,6 +2,7 @@ package io.github.chronosx88.yggdrasil
 
 import android.content.Context
 import android.os.Build.CPU_ABI
+import android.util.Log
 import com.google.gson.Gson
 import config.NodeConfig
 import io.github.chronosx88.yggdrasil.models.config.Config
@@ -37,7 +38,12 @@ fun Context.getYggConfig(): Config {
 }
 
 fun Context.generateYggConfig() {
-    execYgg("-genconf > yggdrasil.conf").waitFor()
+    val process = execYgg("-genconf > ${filesDir.absolutePath}/yggdrasil.conf")
+    process.waitFor()
+    val configBytes = process.inputStream.readBytes()
+    val configStr = String(configBytes)
+    val configFile = File(filesDir, "yggdrasil.conf")
+    configFile.writeText(configStr)
 }
 
 fun createNativeYggConfig(config: Config): NodeConfig {
@@ -58,4 +64,36 @@ fun Context.saveYggConfig(config: Config) {
     val configJson = gson.toJson(config)
     val configFile = File(filesDir, "yggdrasil.conf")
     configFile.writeText(configJson)
+}
+
+fun Context.installBinary() {
+    val type = "yggdrasil-$YGGDRASIL_VERSION-linux-${CPU_ABI.let {
+        when{
+            it.contains("v8") -> "arm64"
+            it.contains("v7") -> "armhf"
+            else -> throw Exception("Unsupported ABI")
+        }
+    }}"
+
+    yggBin.apply {
+        delete()
+        createNewFile()
+    }
+
+    val input = assets.open(type)
+    val output = yggBin.outputStream()
+
+    try {
+        input.copyTo(output)
+    } finally {
+        input.close(); output.close()
+    }
+
+    yggBin.setExecutable(true)
+
+    val yggConfig = getYggConfig() // it generates config automatically
+    yggConfig.ifName = "tun0"
+    saveYggConfig(yggConfig)
+
+    Log.i("Utils", "# Binary installed successfully")
 }

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

@@ -2,8 +2,6 @@ package io.github.chronosx88.yggdrasil
 
 import android.app.Service
 import android.content.Intent
-import android.os.Build.CPU_ABI
-import android.util.Log
 import kotlin.system.exitProcess
 
 class YggdrasilService : Service() {
@@ -15,38 +13,10 @@ class YggdrasilService : Service() {
         var daemon: Process? = null
     }
 
-    private fun installBinary() {
-        val type = "yggdrasil-$YGGDRASIL_VERSION-linux-${CPU_ABI.let {
-            when{
-                it.contains("v8") -> "arm64"
-                it.contains("v7") -> "armhf"
-                else -> throw Exception("Unsupported ABI")
-            }
-        }}"
-
-        yggBin.apply {
-            delete()
-            createNewFile()
-        }
-
-        val input = assets.open(type)
-        val output = yggBin.outputStream()
-
-        try {
-            input.copyTo(output)
-        } finally {
-            input.close(); output.close()
-        }
-
-        yggBin.setExecutable(true)
-        generateYggConfig()
-        Log.i(LOG_TAG, "# Binary installed successfully")
-    }
-
     private fun start() {
-        execYgg("-useconffile yggdrasil.conf").apply {
+        val process = execYgg("-useconffile ${filesDir.absolutePath}/yggdrasil.conf")
-            daemon = this
+        process.waitFor()
-        }
+        daemon = process
     }
 
     private fun stop() {
@@ -66,4 +36,9 @@ class YggdrasilService : Service() {
         }
         return START_STICKY
     }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        stop()
+    }
 }

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

@@ -0,0 +1,67 @@
+package io.github.chronosx88.yggdrasil
+
+import android.app.Service
+import android.content.Intent
+import android.net.VpnService
+import android.os.ParcelFileDescriptor
+import com.google.gson.Gson
+import mobile.Yggdrasil
+
+
+class YggdrasilTunService : VpnService() {
+    companion object {
+        private var isRunning: Boolean = false
+    }
+    private var tunInterface: ParcelFileDescriptor? = null
+
+    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
+        super.onStartCommand(intent, flags, startId)
+        return Service.START_STICKY
+    }
+
+    override fun onCreate() {
+        super.onCreate()
+        isRunning = true
+        setupTunInterface()
+    }
+
+    private fun setupTunInterface() {
+        if(!yggBin.exists()) {
+            installBinary()
+        }
+
+        val builder = Builder()
+
+        val yggTmp = Yggdrasil()
+        val tempYggConfig = getYggConfig()
+        tempYggConfig.ifName = "none"
+        yggTmp.startJSON(Gson().toJson(tempYggConfig).toByteArray())
+        val address = yggTmp.addressString // hack for getting generic ipv6 string from NodeID
+
+        tunInterface = builder
+            .addAddress(address, 7)
+            .addRoute("0200::", 7)
+            .establish()
+
+        createYggdrasilService()
+    }
+
+    private fun createYggdrasilService() {
+        val intent = Intent(this, YggdrasilService::class.java)
+        intent.action = "start"
+        startService(intent)
+    }
+
+    private fun stopYggdrasilService() {
+        val intent = Intent(this, YggdrasilService::class.java)
+        stopService(intent)
+    }
+
+    override fun onRevoke() {
+        super.onRevoke()
+        isRunning = false
+        stopYggdrasilService()
+        tunInterface!!.close()
+        tunInterface = null
+    }
+}

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

@@ -9,6 +9,7 @@
         android:gravity="center">
 
     <Button
+            android:id="@+id/connect_button"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:text="@string/connect_button"