diff --git a/core/client/.gitignore b/core/client/.gitignore
new file mode 100644
index 0000000..0d92dd5
--- /dev/null
+++ b/core/client/.gitignore
@@ -0,0 +1 @@
+*.arr
diff --git a/core/client/Makefile b/core/client/Makefile
new file mode 100644
index 0000000..93b2ccf
--- /dev/null
+++ b/core/client/Makefile
@@ -0,0 +1,6 @@
+run:
+	go run github.com/giolekva/pcloud/core/client/cmd/pcloud
+
+aar: export ANDROID_SDK_ROOT=/Users/lekva/Library/Android/sdk/
+aar:
+	go run gioui.org/cmd/gogio -target android -buildmode archive -o android/app/libs/pcloud.aar github.com/giolekva/pcloud/core/client/cmd/pcloud
diff --git a/core/client/android/app/build.gradle b/core/client/android/app/build.gradle
index 44fe4cf..9102497 100644
--- a/core/client/android/app/build.gradle
+++ b/core/client/android/app/build.gradle
@@ -36,6 +36,7 @@
     implementation "androidx.activity:activity:1.3.1"
 
     implementation 'com.google.code.gson:gson:2.8.9'
+    implementation ':pcloud@aar'
 
     // Desugaring and multidex is required for API < 21.
     coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:1.1.5'
diff --git a/core/client/android/app/src/main/AndroidManifest.xml b/core/client/android/app/src/main/AndroidManifest.xml
index 24728da..a75444d 100644
--- a/core/client/android/app/src/main/AndroidManifest.xml
+++ b/core/client/android/app/src/main/AndroidManifest.xml
@@ -4,9 +4,10 @@
 
     <uses-permission android:name="android.permission.CAMERA" />
     <uses-permission android:name="android.permission.INTERNET" />
-    <!--uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /-->
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
 
     <application
+        android:name=".PCloudApp"
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
@@ -15,14 +16,20 @@
         android:theme="@style/Theme.Pcloud"
         android:hardwareAccelerated="true">
         <activity
-            android:name=".MainActivity"
+            android:name=".PCloudActivity"
             android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
-
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
+        <service android:name=".PCloudVPNService"
+            android:permission="android.permission.BIND_VPN_SERVICE"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.net.VpnService"/>
+            </intent-filter>
+        </service>
     </application>
 
 </manifest>
\ No newline at end of file
diff --git a/core/client/android/app/src/main/java/me/lekva/pcloud/Base64TypeAdapter.java b/core/client/android/app/src/main/java/me/lekva/pcloud/Base64TypeAdapter.java
deleted file mode 100644
index eda2c58..0000000
--- a/core/client/android/app/src/main/java/me/lekva/pcloud/Base64TypeAdapter.java
+++ /dev/null
@@ -1,28 +0,0 @@
-package me.lekva.pcloud;
-
-import android.os.Build;
-import android.util.Base64;
-
-import androidx.annotation.RequiresApi;
-
-import com.google.gson.TypeAdapter;
-import com.google.gson.stream.JsonReader;
-import com.google.gson.stream.JsonWriter;
-
-import java.io.IOException;
-
-public class Base64TypeAdapter extends TypeAdapter<byte[]> {
-    @RequiresApi(api = Build.VERSION_CODES.O)
-    @Override
-    public void write(JsonWriter out, byte[] value) throws IOException {
-        String val = Base64.encodeToString(value, Base64.NO_WRAP);
-        // out.value(val.substring(0, val.length() - 1));
-        out.value(val);
-    }
-
-    @RequiresApi(api = Build.VERSION_CODES.O)
-    @Override
-    public byte[] read(JsonReader in) throws IOException {
-        return Base64.decode(in.nextString(), Base64.NO_WRAP);
-    }
-}
\ No newline at end of file
diff --git a/core/client/android/app/src/main/java/me/lekva/pcloud/MainActivity.java b/core/client/android/app/src/main/java/me/lekva/pcloud/MainActivity.java
deleted file mode 100644
index 4b62246..0000000
--- a/core/client/android/app/src/main/java/me/lekva/pcloud/MainActivity.java
+++ /dev/null
@@ -1,94 +0,0 @@
-package me.lekva.pcloud;
-
-import android.Manifest;
-import android.app.Activity;
-import android.content.pm.PackageManager;
-import android.os.Build;
-import android.os.Bundle;
-import android.view.View;
-
-import androidx.activity.result.ActivityResultLauncher;
-import androidx.annotation.RequiresApi;
-import androidx.appcompat.app.AppCompatActivity;
-import androidx.core.app.ActivityCompat;
-import androidx.core.content.ContextCompat;
-
-import com.google.gson.Gson;
-import com.google.gson.GsonBuilder;
-import com.journeyapps.barcodescanner.ScanContract;
-import com.journeyapps.barcodescanner.ScanOptions;
-
-import java.io.BufferedOutputStream;
-import java.io.IOException;
-import java.io.OutputStream;
-import java.net.HttpURLConnection;
-import java.net.URL;
-import java.nio.charset.StandardCharsets;
-
-public class MainActivity extends AppCompatActivity {
-    private final ActivityResultLauncher<ScanOptions> barcodeLauncher = registerForActivityResult(new ScanContract(),
-            result -> {
-                if(result.getContents() != null) {
-                    Gson gson = new GsonBuilder().disableHtmlEscaping().create();
-                    VPNApiServerConfig config = gson.fromJson(result.getContents(), VPNApiServerConfig.class);
-                    join(config);
-                }
-            });
-
-    private void join(VPNApiServerConfig config) {
-        new Thread(() -> {
-            VerifyRequest req = new VerifyRequest();
-            req.message = config.message;
-            req.signature = config.signature;
-            Gson gson = new GsonBuilder().disableHtmlEscaping().create();
-            byte[] data = gson.toJson(req).getBytes(StandardCharsets.UTF_8);
-            HttpURLConnection urlConnection = null;
-            try {
-                URL url = new URL(config.address + "/api/verify");
-                urlConnection = (HttpURLConnection) url.openConnection();
-                urlConnection.setRequestMethod("POST");
-                urlConnection.setRequestProperty("Content-Type", "application/json; charset=utf-8");
-                urlConnection.setRequestProperty("Connection", "close");
-
-                urlConnection.setInstanceFollowRedirects(false);
-                urlConnection.setDoOutput(true);
-                urlConnection.setFixedLengthStreamingMode(data.length);
-
-                OutputStream out = new BufferedOutputStream(urlConnection.getOutputStream());
-                out.write(data);
-                out.flush();
-                out.close();
-                System.out.println(urlConnection.getResponseCode());
-            } catch (IOException e) {
-                e.printStackTrace();
-            } finally {
-                urlConnection.disconnect();
-            }
-        }).start();
-    }
-
-    @Override
-    protected void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
-        setContentView(R.layout.activity_main);
-        Activity act = this;
-        findViewById(R.id.scan_qr_code).setOnClickListener(new View.OnClickListener() {
-            @RequiresApi(api = Build.VERSION_CODES.M)
-            @Override
-            public void onClick(View view) {
-                if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.INTERNET) != PackageManager.PERMISSION_GRANTED) {
-                    System.out.println("fooooooo");
-                    ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.INTERNET}, 20);
-                }
-
-                ScanOptions options = new ScanOptions();
-                options.setDesiredBarcodeFormats(ScanOptions.QR_CODE);
-                options.setPrompt("Join PCloud network");
-                options.setCameraId(0);  // Use a specific camera of the device
-                options.setBeepEnabled(false);
-                options.setBarcodeImageEnabled(false);
-                barcodeLauncher.launch(options);
-            }
-        });
-    }
-}
\ No newline at end of file
diff --git a/core/client/android/app/src/main/java/me/lekva/pcloud/PCloudActivity.java b/core/client/android/app/src/main/java/me/lekva/pcloud/PCloudActivity.java
new file mode 100644
index 0000000..3e737d4
--- /dev/null
+++ b/core/client/android/app/src/main/java/me/lekva/pcloud/PCloudActivity.java
@@ -0,0 +1,82 @@
+package me.lekva.pcloud;
+
+import android.content.res.Configuration;
+import android.os.Bundle;
+
+import androidx.activity.result.ActivityResultLauncher;
+import androidx.annotation.Nullable;
+import androidx.appcompat.app.AppCompatActivity;
+
+import com.journeyapps.barcodescanner.ScanContract;
+import com.journeyapps.barcodescanner.ScanOptions;
+
+import org.gioui.GioView;
+
+public class PCloudActivity extends AppCompatActivity {
+    private GioView view;
+
+    private final ActivityResultLauncher<ScanOptions> barcodeLauncher = registerForActivityResult(new ScanContract(),
+            result -> {
+                if(result.getContents() != null) {
+                    qrcodeScanned(result.getContents());
+                }
+            });
+
+    @Override
+    public void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        view = new GioView(this);
+        setContentView(view);
+        qrcodeScanned("yayaya");
+    }
+
+    @Override
+    public void onDestroy() {
+        view.destroy();
+        super.onDestroy();
+    }
+
+    @Override
+    public void onStart() {
+        super.onStart();
+        view.start();
+    }
+
+    @Override
+    public void onStop() {
+        view.stop();
+        super.onStop();
+    }
+
+    @Override
+    public void onConfigurationChanged(Configuration c) {
+        super.onConfigurationChanged(c);
+        view.configurationChanged();
+    }
+
+    @Override
+    public void onLowMemory() {
+        super.onLowMemory();
+        view.onLowMemory();
+    }
+
+    @Override
+    public void onBackPressed() {
+        if (!view.backPressed())
+            super.onBackPressed();
+    }
+
+    // TODO(giolekva): return void instead of String
+    public String launchBarcodeScanner() {
+        ScanOptions options = new ScanOptions();
+        options.setDesiredBarcodeFormats(ScanOptions.QR_CODE);
+        options.setPrompt("Join PCloud network");
+        options.setCameraId(0);  // Use a specific camera of the device
+        options.setBeepEnabled(true);
+        options.setBarcodeImageEnabled(false);
+        barcodeLauncher.launch(options);
+        return null;
+    }
+
+    private native void qrcodeScanned(String contents);
+}
diff --git a/core/client/android/app/src/main/java/me/lekva/pcloud/PCloudApp.java b/core/client/android/app/src/main/java/me/lekva/pcloud/PCloudApp.java
new file mode 100644
index 0000000..d8b5723
--- /dev/null
+++ b/core/client/android/app/src/main/java/me/lekva/pcloud/PCloudApp.java
@@ -0,0 +1,15 @@
+package me.lekva.pcloud;
+
+import android.app.Application;
+
+import org.gioui.Gio;
+
+public class PCloudApp extends Application {
+    @Override
+    public void onCreate() {
+        System.out.println("fooo");
+        super.onCreate();
+        Gio.init(this);
+        System.out.println("bar");
+    }
+}
diff --git a/core/client/android/app/src/main/java/me/lekva/pcloud/PCloudVPNService.java b/core/client/android/app/src/main/java/me/lekva/pcloud/PCloudVPNService.java
new file mode 100644
index 0000000..43ce99f
--- /dev/null
+++ b/core/client/android/app/src/main/java/me/lekva/pcloud/PCloudVPNService.java
@@ -0,0 +1,55 @@
+package me.lekva.pcloud;
+
+import android.app.Service;
+import android.content.Intent;
+import android.net.VpnService;
+import android.os.Handler;
+import android.os.Message;
+
+import androidx.annotation.NonNull;
+
+public class PCloudVPNService extends VpnService implements Handler.Callback {
+    public static final String ACTION_CONNECT = "CONNECT";
+    public static final String ACTION_DISCONNECT = "DISCONNECT";
+
+    private boolean running = false;
+    private Handler handler = null;
+
+    @Override
+    public void onCreate() {
+        if (handler == null) {
+            handler = new Handler(this);
+        }
+    }
+
+    @Override
+    public int onStartCommand(Intent intent, int flags, int startId) {
+        if (intent != null && intent.getAction().equals(ACTION_DISCONNECT)) {
+            stopVpn();
+            return Service.START_NOT_STICKY;
+        } else {
+            startVpn();
+            return Service.START_STICKY;
+        }
+    }
+
+    @Override
+    public void onDestroy() {
+        stopVpn();
+    }
+
+    private void startVpn() {
+        System.out.println("--- START");
+    }
+
+    private void stopVpn() {
+        System.out.println("--- STOP");
+        running = false;
+    }
+
+    @Override
+    public boolean handleMessage(@NonNull Message message) {
+        System.out.println(getString(message.what));
+        return true;
+    }
+}
diff --git a/core/client/android/app/src/main/java/me/lekva/pcloud/VPNApiServerConfig.java b/core/client/android/app/src/main/java/me/lekva/pcloud/VPNApiServerConfig.java
deleted file mode 100644
index 0128a76..0000000
--- a/core/client/android/app/src/main/java/me/lekva/pcloud/VPNApiServerConfig.java
+++ /dev/null
@@ -1,13 +0,0 @@
-package me.lekva.pcloud;
-
-import com.google.gson.annotations.JsonAdapter;
-import com.google.gson.annotations.SerializedName;
-
-public class VPNApiServerConfig {
-    @SerializedName("vpn_api_addr")
-    public String address;
-    @JsonAdapter(Base64TypeAdapter.class)
-    public byte[] message;
-    @JsonAdapter(Base64TypeAdapter.class)
-    public byte[] signature;
-}
diff --git a/core/client/android/app/src/main/java/me/lekva/pcloud/VerifyRequest.java b/core/client/android/app/src/main/java/me/lekva/pcloud/VerifyRequest.java
deleted file mode 100644
index 7feaef1..0000000
--- a/core/client/android/app/src/main/java/me/lekva/pcloud/VerifyRequest.java
+++ /dev/null
@@ -1,10 +0,0 @@
-package me.lekva.pcloud;
-
-import com.google.gson.annotations.JsonAdapter;
-
-public class VerifyRequest {
-    @JsonAdapter(Base64TypeAdapter.class)
-    public byte[] message;
-    @JsonAdapter(Base64TypeAdapter.class)
-    public byte[] signature;
-}
diff --git a/core/client/android/settings.gradle b/core/client/android/settings.gradle
index f75bfc8..c030043 100644
--- a/core/client/android/settings.gradle
+++ b/core/client/android/settings.gradle
@@ -4,6 +4,9 @@
         google()
         mavenCentral()
         jcenter() // Warning: this repository is going to shut down soon
+        flatDir {
+            dirs 'app/libs'
+        }
     }
 }
 rootProject.name = "pcloud"
diff --git a/core/client/client.go b/core/client/client.go
deleted file mode 100644
index b7c8294..0000000
--- a/core/client/client.go
+++ /dev/null
@@ -1,38 +0,0 @@
-package main
-
-import (
-	"bytes"
-	"encoding/json"
-	"fmt"
-	"net/http"
-)
-
-type VPNApiClient struct {
-	addr string
-}
-
-type signReq struct {
-	Message []byte `json:"message"`
-}
-
-type signResp struct {
-	Signature []byte `json:"signature"`
-}
-
-func (c *VPNApiClient) Sign(message []byte) ([]byte, error) {
-	var data bytes.Buffer
-	if err := json.NewEncoder(&data).Encode(signReq{message}); err != nil {
-		return nil, err
-	}
-	client := &http.Client{}
-	r, err := client.Post(c.addr+"/api/sign", "application/json", &data)
-	if err != nil {
-		fmt.Println(111111)
-		return nil, err
-	}
-	resp := &signResp{}
-	if err := json.NewDecoder(r.Body).Decode(resp); err != nil {
-		return nil, err
-	}
-	return resp.Signature, nil
-}
diff --git a/core/client/cmd/pcloud/app.go b/core/client/cmd/pcloud/app.go
new file mode 100644
index 0000000..5c49644
--- /dev/null
+++ b/core/client/cmd/pcloud/app.go
@@ -0,0 +1,8 @@
+package main
+
+import "gioui.org/app"
+
+type App interface {
+	LaunchBarcodeScanner() error
+	OnView(app.ViewEvent) error
+}
diff --git a/core/client/cmd/pcloud/app_android.go b/core/client/cmd/pcloud/app_android.go
new file mode 100644
index 0000000..8dd7c73
--- /dev/null
+++ b/core/client/cmd/pcloud/app_android.go
@@ -0,0 +1,75 @@
+package main
+
+import (
+	"errors"
+	"unsafe"
+
+	"gioui.org/app"
+	"github.com/giolekva/pcloud/core/client/jni"
+)
+
+type androidApp struct {
+	jvm      *jni.JVM
+	appCtx   jni.Object
+	activity jni.Object
+}
+
+func createApp() App {
+	return &androidApp{
+		jvm:    (*jni.JVM)(unsafe.Pointer(app.JavaVM())),
+		appCtx: jni.Object(app.AppContext()),
+	}
+}
+
+func (a *androidApp) LaunchBarcodeScanner() error {
+	return jni.Do(a.jvm, func(env *jni.Env) error {
+		cls := jni.GetObjectClass(env, a.activity)
+		m := jni.GetMethodID(env, cls, "launchBarcodeScanner", "()Ljava/lang/String;")
+		_, err := jni.CallObjectMethod(env, a.activity, m)
+		return err
+	})
+}
+
+func (a *androidApp) OnView(e app.ViewEvent) error {
+	a.deleteActivityRef()
+	view := jni.Object(e.View)
+	if view == 0 {
+		return nil
+	}
+	activity, err := a.contextForView(view)
+	if err != nil {
+		return err
+	}
+	a.activity = activity
+	return nil
+}
+
+func (a *androidApp) deleteActivityRef() {
+	if a.activity == 0 {
+		return
+	}
+	jni.Do(a.jvm, func(env *jni.Env) error {
+		jni.DeleteGlobalRef(env, a.activity)
+		return nil
+	})
+	a.activity = 0
+}
+
+func (a *androidApp) contextForView(view jni.Object) (jni.Object, error) {
+	if view == 0 {
+		return 0, errors.New("Should not reach")
+	}
+	var ctx jni.Object
+	err := jni.Do(a.jvm, func(env *jni.Env) error {
+		cls := jni.GetObjectClass(env, view)
+		m := jni.GetMethodID(env, cls, "getContext", "()Landroid/content/Context;")
+		var err error
+		ctx, err = jni.CallObjectMethod(env, view, m)
+		ctx = jni.NewGlobalRef(env, ctx)
+		return err
+	})
+	if err != nil {
+		return 0, err
+	}
+	return ctx, nil
+}
diff --git a/core/client/cmd/pcloud/app_darwin.go b/core/client/cmd/pcloud/app_darwin.go
new file mode 100644
index 0000000..a60ea35
--- /dev/null
+++ b/core/client/cmd/pcloud/app_darwin.go
@@ -0,0 +1,22 @@
+package main
+
+import (
+	"errors"
+
+	"gioui.org/app"
+)
+
+type darwinApp struct {
+}
+
+func createApp() App {
+	return &darwinApp{}
+}
+
+func (a *darwinApp) LaunchBarcodeScanner() error {
+	return errors.New("no camera")
+}
+
+func (a *darwinApp) OnView(e app.ViewEvent) error {
+	return nil
+}
diff --git a/core/client/cmd/pcloud/callbacks_android.go b/core/client/cmd/pcloud/callbacks_android.go
new file mode 100644
index 0000000..107b998
--- /dev/null
+++ b/core/client/cmd/pcloud/callbacks_android.go
@@ -0,0 +1,20 @@
+package main
+
+// JNI implementations of Java native callback methods.
+
+import (
+	"fmt"
+	"unsafe"
+
+	"github.com/giolekva/pcloud/core/client/jni"
+)
+
+// #include <jni.h>
+import "C"
+
+//export Java_me_lekva_pcloud_PCloudActivity_qrcodeScanned
+func Java_me_lekva_pcloud_PCloudActivity_qrcodeScanned(env *C.JNIEnv, this C.jobject, contents C.jobject) {
+	jenv := (*jni.Env)(unsafe.Pointer(env))
+	code := jni.GoString(jenv, jni.String(contents))
+	fmt.Printf("!!!! QRCODE SCANNED: %s\n", code)
+}
diff --git a/core/client/cmd/pcloud/client.go b/core/client/cmd/pcloud/client.go
new file mode 100644
index 0000000..0d1fed4
--- /dev/null
+++ b/core/client/cmd/pcloud/client.go
@@ -0,0 +1,57 @@
+package main
+
+import (
+	"bytes"
+	"crypto/tls"
+	"encoding/json"
+	"fmt"
+	"net/http"
+)
+
+type VPNClient interface {
+	Address() string
+	Sign(message []byte) ([]byte, error)
+}
+
+type directVPNClient struct {
+	addr string
+}
+
+func NewDirectVPNClient(addr string) VPNClient {
+	return &directVPNClient{addr}
+}
+
+func (c *directVPNClient) Address() string {
+	return c.addr
+}
+
+type signReq struct {
+	Message []byte `json:"message"`
+}
+
+type signResp struct {
+	Signature []byte `json:"signature"`
+}
+
+func (c *directVPNClient) Sign(message []byte) ([]byte, error) {
+	var data bytes.Buffer
+	if err := json.NewEncoder(&data).Encode(signReq{message}); err != nil {
+		return nil, err
+	}
+	client := &http.Client{
+		// TODO(giolekva): remove, for some reason valid certificates are not accepted on gioui android.
+		Transport: &http.Transport{
+			TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
+		},
+	}
+	r, err := client.Post(c.addr+"/api/sign", "application/json", &data)
+	if err != nil {
+		fmt.Println(111111)
+		return nil, err
+	}
+	resp := &signResp{}
+	if err := json.NewDecoder(r.Body).Decode(resp); err != nil {
+		return nil, err
+	}
+	return resp.Signature, nil
+}
diff --git a/core/client/cmd/pcloud/main.go b/core/client/cmd/pcloud/main.go
new file mode 100644
index 0000000..16fa940
--- /dev/null
+++ b/core/client/cmd/pcloud/main.go
@@ -0,0 +1,75 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+
+	"gioui.org/app"
+	"gioui.org/io/system"
+	"gioui.org/layout"
+	"gioui.org/op"
+	"gioui.org/unit"
+)
+
+var vpnApiAddr = flag.String("vpn-api-addr", "https://vpn.lekva.me", "VPN API server address")
+
+func processUIEvents(a App, events []UIEvent) error {
+	for _, e := range events {
+		switch e.(type) {
+		case EventScanBarcode:
+			return a.LaunchBarcodeScanner()
+		default:
+			return fmt.Errorf("Unhandled event: %#v", e)
+		}
+	}
+	return nil
+}
+
+func run() error {
+	a := createApp()
+	vc := NewDirectVPNClient(*vpnApiAddr)
+	ui := NewUI(vc)
+	w := app.NewWindow(
+		app.Size(unit.Px(1500), unit.Px(1500)),
+		app.Title("PCloud"),
+	)
+	var ops op.Ops
+	for {
+		select {
+		case e := <-w.Events():
+			switch e := e.(type) {
+			case app.ViewEvent:
+				if err := a.OnView(e); err != nil {
+					return err
+				} else {
+					w.Invalidate()
+				}
+			case *system.CommandEvent:
+				if e.Type == system.CommandBack {
+					if ui.OnBack() {
+						e.Cancel = true
+						w.Invalidate()
+					}
+				}
+			case system.FrameEvent:
+				gtx := layout.NewContext(&ops, e)
+				events := ui.Layout(gtx)
+				e.Frame(&ops)
+				if err := processUIEvents(a, events); err != nil {
+					return err
+				}
+			}
+		}
+	}
+	return nil
+}
+
+func main() {
+	flag.Parse()
+	go func() {
+		if err := run(); err != nil {
+			panic(err)
+		}
+	}()
+	app.Main()
+}
diff --git a/core/client/cmd/pcloud/nebula.go b/core/client/cmd/pcloud/nebula.go
new file mode 100644
index 0000000..76d4503
--- /dev/null
+++ b/core/client/cmd/pcloud/nebula.go
@@ -0,0 +1,9 @@
+package main
+
+import (
+	neb "github.com/slackhq/nebula"
+)
+
+func Start() {
+	neb.Main(nil, false, "", nil, nil)
+}
diff --git a/core/client/cmd/pcloud/tools.go b/core/client/cmd/pcloud/tools.go
new file mode 100644
index 0000000..8fc2b80
--- /dev/null
+++ b/core/client/cmd/pcloud/tools.go
@@ -0,0 +1,8 @@
+//go:build tools
+// +build tools
+
+package main
+
+import (
+	_ "gioui.org/cmd/gogio"
+)
diff --git a/core/client/cmd/pcloud/ui.go b/core/client/cmd/pcloud/ui.go
new file mode 100644
index 0000000..2a0a382
--- /dev/null
+++ b/core/client/cmd/pcloud/ui.go
@@ -0,0 +1,173 @@
+package main
+
+import (
+	"bytes"
+	"encoding/json"
+	"image"
+	"image/color"
+	"image/png"
+
+	"gioui.org/layout"
+	"gioui.org/op/clip"
+	"gioui.org/op/paint"
+	"gioui.org/unit"
+	"gioui.org/widget"
+	"github.com/skip2/go-qrcode"
+)
+
+type (
+	C = layout.Context
+	D = layout.Dimensions
+)
+
+type UI struct {
+	vc VPNClient
+
+	invite struct {
+		open widget.Clickable
+		show bool
+		qr   image.Image
+	}
+
+	join struct {
+		open   widget.Clickable
+		show   bool
+		qrcode string
+	}
+}
+
+func NewUI(vc VPNClient) *UI {
+	return &UI{
+		vc: vc,
+	}
+}
+
+func (ui *UI) OnBack() bool {
+	if ui.invite.show {
+		ui.invite.show = false
+		return true
+	} else if ui.join.show {
+		ui.join.show = false
+		return true
+	}
+	return false
+}
+
+func (ui *UI) Layout(gtx C) []UIEvent {
+	var events []UIEvent
+	if ui.invite.open.Clicked() {
+		ui.join.show = false
+		ui.invite.show = true
+		ui.invite.qr = nil
+	} else if ui.join.open.Clicked() {
+		ui.invite.show = false
+		ui.join.show = true
+		events = append(events, EventScanBarcode{})
+	}
+	if ui.invite.show {
+		ui.layout(gtx, ui.layoutInvite)
+	} else if ui.join.show {
+		ui.layout(gtx, ui.layoutJoin)
+	} else {
+		ui.layout(gtx, ui.layoutMain)
+	}
+	return events
+}
+
+func (ui *UI) layout(gtx C, mainPanel layout.Widget) D {
+	return layout.Flex{Axis: layout.Vertical}.Layout(gtx,
+		layout.Flexed(10, func(gtx C) D {
+			return mainPanel(gtx)
+		}),
+		layout.Flexed(1, func(gtx C) D {
+			return ui.layoutActions(gtx)
+		}),
+	)
+}
+
+func ColorBox(gtx layout.Context, size image.Point, color color.NRGBA) layout.Dimensions {
+	defer clip.Rect{Max: size}.Push(gtx.Ops).Pop()
+	paint.ColorOp{Color: color}.Add(gtx.Ops)
+	paint.PaintOp{}.Add(gtx.Ops)
+	return layout.Dimensions{Size: size}
+}
+
+func (ui *UI) layoutMain(gtx C) D {
+	return ColorBox(gtx, gtx.Constraints.Min, color.NRGBA{B: 255, A: 255})
+}
+
+func (ui *UI) layoutActions(gtx C) D {
+	return layout.Flex{Axis: layout.Horizontal}.Layout(gtx,
+		layout.Flexed(1, func(gtx C) D {
+			return ui.invite.open.Layout(gtx, func(gtx C) D {
+				return ColorBox(gtx, gtx.Constraints.Min, color.NRGBA{R: 255, A: 255})
+			})
+
+		}),
+		layout.Flexed(1, func(gtx C) D {
+			return ui.join.open.Layout(gtx, func(gtx C) D {
+				return ColorBox(gtx, gtx.Constraints.Min, color.NRGBA{G: 128, A: 255})
+			})
+		}),
+	)
+}
+
+func (ui *UI) layoutInvite(gtx C) D {
+	if ui.invite.qr == nil {
+		img, err := prepareConfigQRCode(ui.vc)
+		if err != nil {
+			panic(err)
+		}
+		ui.invite.qr = img
+	}
+	d := ui.invite.qr.Bounds().Max.Sub(ui.invite.qr.Bounds().Min)
+	return layout.Inset{
+		Left: unit.Px(0.5 * float32(gtx.Constraints.Max.X-d.X)),
+		Top:  unit.Px(0.5 * float32(gtx.Constraints.Max.Y-d.Y)),
+	}.Layout(gtx, func(gtx C) D {
+		paint.NewImageOp(ui.invite.qr).Add(gtx.Ops)
+		paint.PaintOp{}.Add(gtx.Ops)
+		return D{Size: gtx.Constraints.Max}
+	})
+}
+
+func (ui *UI) layoutJoin(gtx C) D {
+	if ui.join.qrcode == "" {
+		return ColorBox(gtx, gtx.Constraints.Min, color.NRGBA{R: 255, A: 255})
+	}
+	return ColorBox(gtx, gtx.Constraints.Min, color.NRGBA{R: 255, G: 255, B: 255, A: 255})
+}
+
+// helpers
+
+type qrCodeData struct {
+	VPNApiAddr string `json:"vpn_api_addr"`
+	Message    []byte `json:"message"`
+	Signature  []byte `json:"signature"`
+}
+
+func prepareConfigQRCode(vc VPNClient) (image.Image, error) {
+	message := []byte("Hello PCloud")
+	signature, err := vc.Sign(message)
+	if err != nil {
+		return nil, err
+	}
+	c := qrCodeData{
+		vc.Address(),
+		message,
+		signature,
+	}
+	var data bytes.Buffer
+	if err := json.NewEncoder(&data).Encode(c); err != nil {
+		return nil, err
+	}
+	qr, err := qrcode.Encode(data.String(), qrcode.Medium, 1024)
+	if err != nil {
+		return nil, err
+	}
+	img, err := png.Decode(bytes.NewReader(qr))
+	if err != nil {
+		return nil, err
+	}
+	return img, nil
+}
diff --git a/core/client/cmd/pcloud/ui_events.go b/core/client/cmd/pcloud/ui_events.go
new file mode 100644
index 0000000..044abbf
--- /dev/null
+++ b/core/client/cmd/pcloud/ui_events.go
@@ -0,0 +1,5 @@
+package main
+
+type UIEvent interface{}
+
+type EventScanBarcode struct{}
diff --git a/core/client/go.mod b/core/client/go.mod
index 4ae29af..4f10753 100644
--- a/core/client/go.mod
+++ b/core/client/go.mod
@@ -4,6 +4,8 @@
 
 require (
 	gioui.org v0.0.0-20211201162354-9a5298914282
+	gioui.org/cmd v0.0.0-20211214104907-f5c9d2725c7b
 	github.com/skip2/go-qrcode v0.0.0-20200617195104-da1b6568686e
-	golang.org/x/sys v0.0.0-20211007075335-d3039528d8ac // indirect
+	github.com/slackhq/nebula v1.5.1
+	golang.org/x/tools v0.1.8-0.20211022200916-316ba0b74098 // indirect
 )
diff --git a/core/client/go.sum b/core/client/go.sum
index 4d97385..7945d56 100644
--- a/core/client/go.sum
+++ b/core/client/go.sum
@@ -1,8 +1,42 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
+cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
+cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
+cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
+cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
+cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs=
+cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc=
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+cloud.google.com/go/datastore v1.1.0/go.mod h1:umbIZjpQpHh4hmRpGhH4tLFup+FVzqBi1b3c64qFpCk=
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+cloud.google.com/go/pubsub v1.3.1/go.mod h1:i+ucay31+CNRpDW4Lu78I4xXG+O1r/MAHgjpRVR+TSU=
+cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
+cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0ZeosJ0Rtdos=
+cloud.google.com/go/storage v1.6.0/go.mod h1:N7U0C8pVQ/+NIKOBQyamJIeKQKkZ+mxpohlUTyfDhBk=
+cloud.google.com/go/storage v1.8.0/go.mod h1:Wv1Oy7z6Yz3DshWRJFhqM/UCfaWIRTdp0RXyy7KQOVs=
+cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9ullr3+Kg0=
+dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20201218220906-28db891af037/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
+gioui.org v0.0.0-20211110142422-303b81953991/go.mod h1:yoWOxPng6WkDpsud+NRmkoftmyWn3rkKsYGEcWHpjTI=
 gioui.org v0.0.0-20211201162354-9a5298914282 h1:AhBq0mtPYfXW7XyJ5ixFi7VA0/gwPC7HykpTTHTR9Lc=
 gioui.org v0.0.0-20211201162354-9a5298914282/go.mod h1:yoWOxPng6WkDpsud+NRmkoftmyWn3rkKsYGEcWHpjTI=
+gioui.org/cmd v0.0.0-20211214104907-f5c9d2725c7b h1:ysvLB/HGq7oVjjjfFQfOnHPTanAMqtuHDsKSJkNM9eE=
+gioui.org/cmd v0.0.0-20211214104907-f5c9d2725c7b/go.mod h1:bH6HiOnaLVXwKxDBQyhZOC97zcDIZBvl0PUxmIRtEGw=
 gioui.org/cpu v0.0.0-20210808092351-bfe733dd3334/go.mod h1:A8M0Cn5o+vY5LTMlnRoK3O5kG+rH0kWfJjeKd9QpBmQ=
 gioui.org/cpu v0.0.0-20210817075930-8d6a761490d2 h1:AGDDxsJE1RpcXTAxPG2B4jrwVUJGFDjINIPi1jtO6pc=
 gioui.org/cpu v0.0.0-20210817075930-8d6a761490d2/go.mod h1:A8M0Cn5o+vY5LTMlnRoK3O5kG+rH0kWfJjeKd9QpBmQ=
@@ -15,29 +49,47 @@
 github.com/Shopify/toxiproxy v2.1.4+incompatible/go.mod h1:OXgGpZ6Cli1/URJOF1DMxUHB2q5Ap20/P/eIdh4G0pI=
 github.com/VividCortex/gohistogram v1.0.0/go.mod h1:Pf5mBqqDxYaXu3hDrrU+w6nw50o/4+TcAqDqk/vUH7g=
 github.com/afex/hystrix-go v0.0.0-20180502004556-fa1af6a1f4f5/go.mod h1:SkGFH1ia65gfNATL8TAiHDNxPzPdmEL5uirI2Uyuz6c=
+github.com/akavel/rsrc v0.10.1 h1:hCCPImjmFKVNGpeLZyTDRHEFC283DzyTXTo0cO0Rq9o=
+github.com/akavel/rsrc v0.10.1/go.mod h1:uLoCtb9J+EyAqh+26kdrTgmzRBFPGOolLWKpdxkKq+c=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
+github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
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 github.com/apache/thrift v0.12.0/go.mod h1:cp2SuWMxlEZw2r+iP2GNCdIi4C1qmUzdZFSVb+bacwQ=
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@@ -271,27 +445,52 @@
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+gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
+gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
+honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
+honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
 honnef.co/go/tools v0.1.3/go.mod h1:NgwopIslSNH47DimFoV78dnkksY2EFtX0ajyb3K/las=
+rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
+rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
+rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
 sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
 sourcegraph.com/sourcegraph/appdash v0.0.0-20190731080439-ebfcffb1b5c0/go.mod h1:hI742Nqp5OhwiqlzhgfbWU4mW4yO10fP+LoT9WOswdU=
diff --git a/core/client/jni/jni.go b/core/client/jni/jni.go
new file mode 100644
index 0000000..372a8a3
--- /dev/null
+++ b/core/client/jni/jni.go
@@ -0,0 +1 @@
+package jni
diff --git a/core/client/jni/jni_android.go b/core/client/jni/jni_android.go
new file mode 100644
index 0000000..24f8ed4
--- /dev/null
+++ b/core/client/jni/jni_android.go
@@ -0,0 +1,489 @@
+// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package jni implements various helper functions for communicating with the Android JVM
+// though JNI.
+package jni
+
+import (
+	"errors"
+	"fmt"
+	"reflect"
+	"runtime"
+	"sync"
+	"unicode/utf16"
+	"unsafe"
+)
+
+/*
+#cgo CFLAGS: -Wall
+
+#include <jni.h>
+#include <stdlib.h>
+
+static jint jni_AttachCurrentThread(JavaVM *vm, JNIEnv **p_env, void *thr_args) {
+	return (*vm)->AttachCurrentThread(vm, p_env, thr_args);
+}
+
+static jint jni_DetachCurrentThread(JavaVM *vm) {
+	return (*vm)->DetachCurrentThread(vm);
+}
+
+static jint jni_GetEnv(JavaVM *vm, JNIEnv **env, jint version) {
+	return (*vm)->GetEnv(vm, (void **)env, version);
+}
+
+static jclass jni_FindClass(JNIEnv *env, const char *name) {
+	return (*env)->FindClass(env, name);
+}
+
+static jthrowable jni_ExceptionOccurred(JNIEnv *env) {
+	return (*env)->ExceptionOccurred(env);
+}
+
+static void jni_ExceptionClear(JNIEnv *env) {
+	(*env)->ExceptionClear(env);
+}
+
+static jclass jni_GetObjectClass(JNIEnv *env, jobject obj) {
+	return (*env)->GetObjectClass(env, obj);
+}
+
+static jmethodID jni_GetMethodID(JNIEnv *env, jclass clazz, const char *name, const char *sig) {
+	return (*env)->GetMethodID(env, clazz, name, sig);
+}
+
+static jmethodID jni_GetStaticMethodID(JNIEnv *env, jclass clazz, const char *name, const char *sig) {
+	return (*env)->GetStaticMethodID(env, clazz, name, sig);
+}
+
+static jsize jni_GetStringLength(JNIEnv *env, jstring str) {
+	return (*env)->GetStringLength(env, str);
+}
+
+static const jchar *jni_GetStringChars(JNIEnv *env, jstring str) {
+	return (*env)->GetStringChars(env, str, NULL);
+}
+
+static jstring jni_NewString(JNIEnv *env, const jchar *unicodeChars, jsize len) {
+	return (*env)->NewString(env, unicodeChars, len);
+}
+
+static jboolean jni_IsSameObject(JNIEnv *env, jobject ref1, jobject ref2) {
+	return (*env)->IsSameObject(env, ref1, ref2);
+}
+
+static jobject jni_NewGlobalRef(JNIEnv *env, jobject obj) {
+	return (*env)->NewGlobalRef(env, obj);
+}
+
+static void jni_DeleteGlobalRef(JNIEnv *env, jobject obj) {
+	(*env)->DeleteGlobalRef(env, obj);
+}
+
+static void jni_CallStaticVoidMethodA(JNIEnv *env, jclass cls, jmethodID method, jvalue *args) {
+	(*env)->CallStaticVoidMethodA(env, cls, method, args);
+}
+
+static jint jni_CallStaticIntMethodA(JNIEnv *env, jclass cls, jmethodID method, jvalue *args) {
+	return (*env)->CallStaticIntMethodA(env, cls, method, args);
+}
+
+static jobject jni_CallStaticObjectMethodA(JNIEnv *env, jclass cls, jmethodID method, jvalue *args) {
+	return (*env)->CallStaticObjectMethodA(env, cls, method, args);
+}
+
+static jobject jni_CallObjectMethodA(JNIEnv *env, jobject obj, jmethodID method, jvalue *args) {
+	return (*env)->CallObjectMethodA(env, obj, method, args);
+}
+
+static jboolean jni_CallBooleanMethodA(JNIEnv *env, jobject obj, jmethodID method, jvalue *args) {
+	return (*env)->CallBooleanMethodA(env, obj, method, args);
+}
+
+static jint jni_CallIntMethodA(JNIEnv *env, jobject obj, jmethodID method, jvalue *args) {
+	return (*env)->CallIntMethodA(env, obj, method, args);
+}
+
+static void jni_CallVoidMethodA(JNIEnv *env, jobject obj, jmethodID method, jvalue *args) {
+	(*env)->CallVoidMethodA(env, obj, method, args);
+}
+
+static jbyteArray jni_NewByteArray(JNIEnv *env, jsize length) {
+	return (*env)->NewByteArray(env, length);
+}
+
+static jboolean *jni_GetBooleanArrayElements(JNIEnv *env, jbooleanArray arr) {
+	return (*env)->GetBooleanArrayElements(env, arr, NULL);
+}
+
+static void jni_ReleaseBooleanArrayElements(JNIEnv *env, jbooleanArray arr, jboolean *elems, jint mode) {
+	(*env)->ReleaseBooleanArrayElements(env, arr, elems, mode);
+}
+
+static jbyte *jni_GetByteArrayElements(JNIEnv *env, jbyteArray arr) {
+	return (*env)->GetByteArrayElements(env, arr, NULL);
+}
+
+static jint *jni_GetIntArrayElements(JNIEnv *env, jintArray arr) {
+	return (*env)->GetIntArrayElements(env, arr, NULL);
+}
+
+static void jni_ReleaseIntArrayElements(JNIEnv *env, jintArray arr, jint *elems, jint mode) {
+	(*env)->ReleaseIntArrayElements(env, arr, elems, mode);
+}
+
+static jlong *jni_GetLongArrayElements(JNIEnv *env, jlongArray arr) {
+	return (*env)->GetLongArrayElements(env, arr, NULL);
+}
+
+static void jni_ReleaseLongArrayElements(JNIEnv *env, jlongArray arr, jlong *elems, jint mode) {
+	(*env)->ReleaseLongArrayElements(env, arr, elems, mode);
+}
+
+static void jni_ReleaseByteArrayElements(JNIEnv *env, jbyteArray arr, jbyte *elems, jint mode) {
+	(*env)->ReleaseByteArrayElements(env, arr, elems, mode);
+}
+
+static jsize jni_GetArrayLength(JNIEnv *env, jarray arr) {
+	return (*env)->GetArrayLength(env, arr);
+}
+
+static void jni_DeleteLocalRef(JNIEnv *env, jobject localRef) {
+	return (*env)->DeleteLocalRef(env, localRef);
+}
+
+static jobject jni_GetObjectArrayElement(JNIEnv *env, jobjectArray array, jsize index) {
+	return (*env)->GetObjectArrayElement(env, array, index);
+}
+
+static jboolean jni_IsInstanceOf(JNIEnv *env, jobject obj, jclass clazz) {
+	return (*env)->IsInstanceOf(env, obj, clazz);
+}
+*/
+import "C"
+
+type JVM C.JavaVM
+
+type Env C.JNIEnv
+
+type (
+	Class        C.jclass
+	Object       C.jobject
+	MethodID     C.jmethodID
+	String       C.jstring
+	ByteArray    C.jbyteArray
+	ObjectArray  C.jobjectArray
+	BooleanArray C.jbooleanArray
+	LongArray    C.jlongArray
+	IntArray     C.jintArray
+	Boolean      C.jboolean
+	Value        uint64 // All JNI types fit into 64-bits.
+)
+
+// Cached class handles.
+var classes struct {
+	once                      sync.Once
+	stringClass, integerClass Class
+
+	integerIntValue MethodID
+}
+
+func env(e *Env) *C.JNIEnv {
+	return (*C.JNIEnv)(unsafe.Pointer(e))
+}
+
+func javavm(vm *JVM) *C.JavaVM {
+	return (*C.JavaVM)(unsafe.Pointer(vm))
+}
+
+// Do invokes a function with a temporary JVM environment. The
+// environment is not valid after the function returns.
+func Do(vm *JVM, f func(env *Env) error) error {
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+	var env *C.JNIEnv
+	if res := C.jni_GetEnv(javavm(vm), &env, C.JNI_VERSION_1_6); res != C.JNI_OK {
+		if res != C.JNI_EDETACHED {
+			panic(fmt.Errorf("JNI GetEnv failed with error %d", res))
+		}
+		if C.jni_AttachCurrentThread(javavm(vm), &env, nil) != C.JNI_OK {
+			panic(errors.New("runInJVM: AttachCurrentThread failed"))
+		}
+		defer C.jni_DetachCurrentThread(javavm(vm))
+	}
+
+	return f((*Env)(unsafe.Pointer(env)))
+}
+
+func Bool(b bool) Boolean {
+	if b {
+		return C.JNI_TRUE
+	}
+	return C.JNI_FALSE
+}
+
+func varArgs(args []Value) *C.jvalue {
+	if len(args) == 0 {
+		return nil
+	}
+	return (*C.jvalue)(unsafe.Pointer(&args[0]))
+}
+
+func IsSameObject(e *Env, ref1, ref2 Object) bool {
+	same := C.jni_IsSameObject(env(e), C.jobject(ref1), C.jobject(ref2))
+	return same == C.JNI_TRUE
+}
+
+func CallStaticIntMethod(e *Env, cls Class, method MethodID, args ...Value) (int, error) {
+	res := C.jni_CallStaticIntMethodA(env(e), C.jclass(cls), C.jmethodID(method), varArgs(args))
+	return int(res), exception(e)
+}
+
+func CallStaticVoidMethod(e *Env, cls Class, method MethodID, args ...Value) error {
+	C.jni_CallStaticVoidMethodA(env(e), C.jclass(cls), C.jmethodID(method), varArgs(args))
+	return exception(e)
+}
+
+func CallVoidMethod(e *Env, obj Object, method MethodID, args ...Value) error {
+	C.jni_CallVoidMethodA(env(e), C.jobject(obj), C.jmethodID(method), varArgs(args))
+	return exception(e)
+}
+
+func CallStaticObjectMethod(e *Env, cls Class, method MethodID, args ...Value) (Object, error) {
+	res := C.jni_CallStaticObjectMethodA(env(e), C.jclass(cls), C.jmethodID(method), varArgs(args))
+	return Object(res), exception(e)
+}
+
+func CallObjectMethod(e *Env, obj Object, method MethodID, args ...Value) (Object, error) {
+	res := C.jni_CallObjectMethodA(env(e), C.jobject(obj), C.jmethodID(method), varArgs(args))
+	return Object(res), exception(e)
+}
+
+func CallBooleanMethod(e *Env, obj Object, method MethodID, args ...Value) (bool, error) {
+	res := C.jni_CallBooleanMethodA(env(e), C.jobject(obj), C.jmethodID(method), varArgs(args))
+	return res == C.JNI_TRUE, exception(e)
+}
+
+func CallIntMethod(e *Env, obj Object, method MethodID, args ...Value) (int32, error) {
+	res := C.jni_CallIntMethodA(env(e), C.jobject(obj), C.jmethodID(method), varArgs(args))
+	return int32(res), exception(e)
+}
+
+// GetByteArrayElements returns the contents of the byte array.
+func GetByteArrayElements(e *Env, jarr ByteArray) []byte {
+	if jarr == 0 {
+		return nil
+	}
+	size := C.jni_GetArrayLength(env(e), C.jarray(jarr))
+	elems := C.jni_GetByteArrayElements(env(e), C.jbyteArray(jarr))
+	defer C.jni_ReleaseByteArrayElements(env(e), C.jbyteArray(jarr), elems, 0)
+	backing := (*(*[1 << 30]byte)(unsafe.Pointer(elems)))[:size:size]
+	s := make([]byte, len(backing))
+	copy(s, backing)
+	return s
+}
+
+// GetBooleanArrayElements returns the contents of the boolean array.
+func GetBooleanArrayElements(e *Env, jarr BooleanArray) []bool {
+	if jarr == 0 {
+		return nil
+	}
+	size := C.jni_GetArrayLength(env(e), C.jarray(jarr))
+	elems := C.jni_GetBooleanArrayElements(env(e), C.jbooleanArray(jarr))
+	defer C.jni_ReleaseBooleanArrayElements(env(e), C.jbooleanArray(jarr), elems, 0)
+	backing := (*(*[1 << 30]C.jboolean)(unsafe.Pointer(elems)))[:size:size]
+	r := make([]bool, len(backing))
+	for i, b := range backing {
+		r[i] = b == C.JNI_TRUE
+	}
+	return r
+}
+
+// GetStringArrayElements returns the contents of the String array.
+func GetStringArrayElements(e *Env, jarr ObjectArray) []string {
+	var strings []string
+	iterateObjectArray(e, jarr, func(e *Env, idx int, item Object) {
+		s := GoString(e, String(item))
+		strings = append(strings, s)
+	})
+	return strings
+}
+
+// GetIntArrayElements returns the contents of the int array.
+func GetIntArrayElements(e *Env, jarr IntArray) []int {
+	if jarr == 0 {
+		return nil
+	}
+	size := C.jni_GetArrayLength(env(e), C.jarray(jarr))
+	elems := C.jni_GetIntArrayElements(env(e), C.jintArray(jarr))
+	defer C.jni_ReleaseIntArrayElements(env(e), C.jintArray(jarr), elems, 0)
+	backing := (*(*[1 << 27]C.jint)(unsafe.Pointer(elems)))[:size:size]
+	r := make([]int, len(backing))
+	for i, l := range backing {
+		r[i] = int(l)
+	}
+	return r
+}
+
+// GetLongArrayElements returns the contents of the long array.
+func GetLongArrayElements(e *Env, jarr LongArray) []int64 {
+	if jarr == 0 {
+		return nil
+	}
+	size := C.jni_GetArrayLength(env(e), C.jarray(jarr))
+	elems := C.jni_GetLongArrayElements(env(e), C.jlongArray(jarr))
+	defer C.jni_ReleaseLongArrayElements(env(e), C.jlongArray(jarr), elems, 0)
+	backing := (*(*[1 << 27]C.jlong)(unsafe.Pointer(elems)))[:size:size]
+	r := make([]int64, len(backing))
+	for i, l := range backing {
+		r[i] = int64(l)
+	}
+	return r
+}
+
+func iterateObjectArray(e *Env, jarr ObjectArray, f func(e *Env, idx int, item Object)) {
+	if jarr == 0 {
+		return
+	}
+	size := C.jni_GetArrayLength(env(e), C.jarray(jarr))
+	for i := 0; i < int(size); i++ {
+		item := C.jni_GetObjectArrayElement(env(e), C.jobjectArray(jarr), C.jint(i))
+		f(e, i, Object(item))
+		C.jni_DeleteLocalRef(env(e), item)
+	}
+}
+
+// NewByteArray allocates a Java byte array with the content. It
+// panics if the allocation fails.
+func NewByteArray(e *Env, content []byte) ByteArray {
+	jarr := C.jni_NewByteArray(env(e), C.jsize(len(content)))
+	if jarr == 0 {
+		panic(fmt.Errorf("jni: NewByteArray(%d) failed", len(content)))
+	}
+	elems := C.jni_GetByteArrayElements(env(e), jarr)
+	defer C.jni_ReleaseByteArrayElements(env(e), jarr, elems, 0)
+	backing := (*(*[1 << 30]byte)(unsafe.Pointer(elems)))[:len(content):len(content)]
+	copy(backing, content)
+	return ByteArray(jarr)
+}
+
+// ClassLoader returns a reference to the Java ClassLoader associated
+// with obj.
+func ClassLoaderFor(e *Env, obj Object) Object {
+	cls := GetObjectClass(e, obj)
+	getClassLoader := GetMethodID(e, cls, "getClassLoader", "()Ljava/lang/ClassLoader;")
+	clsLoader, err := CallObjectMethod(e, Object(obj), getClassLoader)
+	if err != nil {
+		// Class.getClassLoader should never fail.
+		panic(err)
+	}
+	return Object(clsLoader)
+}
+
+// LoadClass invokes the underlying ClassLoader's loadClass method and
+// returns the class.
+func LoadClass(e *Env, loader Object, class string) (Class, error) {
+	cls := GetObjectClass(e, loader)
+	loadClass := GetMethodID(e, cls, "loadClass", "(Ljava/lang/String;)Ljava/lang/Class;")
+	name := JavaString(e, class)
+	loaded, err := CallObjectMethod(e, loader, loadClass, Value(name))
+	if err != nil {
+		return 0, err
+	}
+	return Class(loaded), exception(e)
+}
+
+// exception returns an error corresponding to the pending
+// exception, and clears it. exceptionError returns nil if no
+// exception is pending.
+func exception(e *Env) error {
+	thr := C.jni_ExceptionOccurred(env(e))
+	if thr == 0 {
+		return nil
+	}
+	C.jni_ExceptionClear(env(e))
+	cls := GetObjectClass(e, Object(thr))
+	toString := GetMethodID(e, cls, "toString", "()Ljava/lang/String;")
+	msg, err := CallObjectMethod(e, Object(thr), toString)
+	if err != nil {
+		return err
+	}
+	return errors.New(GoString(e, String(msg)))
+}
+
+// GetObjectClass returns the Java Class for an Object.
+func GetObjectClass(e *Env, obj Object) Class {
+	if obj == 0 {
+		panic("null object")
+	}
+	cls := C.jni_GetObjectClass(env(e), C.jobject(obj))
+	if err := exception(e); err != nil {
+		// GetObjectClass should never fail.
+		panic(err)
+	}
+	return Class(cls)
+}
+
+// GetStaticMethodID returns the id for a static method. It panics if the method
+// wasn't found.
+func GetStaticMethodID(e *Env, cls Class, name, signature string) MethodID {
+	mname := C.CString(name)
+	defer C.free(unsafe.Pointer(mname))
+	msig := C.CString(signature)
+	defer C.free(unsafe.Pointer(msig))
+	m := C.jni_GetStaticMethodID(env(e), C.jclass(cls), mname, msig)
+	if err := exception(e); err != nil {
+		panic(err)
+	}
+	return MethodID(m)
+}
+
+// GetMethodID returns the id for a method. It panics if the method
+// wasn't found.
+func GetMethodID(e *Env, cls Class, name, signature string) MethodID {
+	mname := C.CString(name)
+	defer C.free(unsafe.Pointer(mname))
+	msig := C.CString(signature)
+	defer C.free(unsafe.Pointer(msig))
+	m := C.jni_GetMethodID(env(e), C.jclass(cls), mname, msig)
+	if err := exception(e); err != nil {
+		panic(err)
+	}
+	return MethodID(m)
+}
+
+func NewGlobalRef(e *Env, obj Object) Object {
+	return Object(C.jni_NewGlobalRef(env(e), C.jobject(obj)))
+}
+
+func DeleteGlobalRef(e *Env, obj Object) {
+	C.jni_DeleteGlobalRef(env(e), C.jobject(obj))
+}
+
+// JavaString converts the string to a JVM jstring.
+func JavaString(e *Env, str string) String {
+	if str == "" {
+		return 0
+	}
+	utf16Chars := utf16.Encode([]rune(str))
+	res := C.jni_NewString(env(e), (*C.jchar)(unsafe.Pointer(&utf16Chars[0])), C.int(len(utf16Chars)))
+	return String(res)
+}
+
+// GoString converts the JVM jstring to a Go string.
+func GoString(e *Env, str String) string {
+	if str == 0 {
+		return ""
+	}
+	strlen := C.jni_GetStringLength(env(e), C.jstring(str))
+	chars := C.jni_GetStringChars(env(e), C.jstring(str))
+	var utf16Chars []uint16
+	hdr := (*reflect.SliceHeader)(unsafe.Pointer(&utf16Chars))
+	hdr.Data = uintptr(unsafe.Pointer(chars))
+	hdr.Cap = int(strlen)
+	hdr.Len = int(strlen)
+	utf8 := utf16.Decode(utf16Chars)
+	return string(utf8)
+}
diff --git a/core/client/main.go b/core/client/main.go
deleted file mode 100644
index 44bc154..0000000
--- a/core/client/main.go
+++ /dev/null
@@ -1,78 +0,0 @@
-package main
-
-import (
-	"bytes"
-	"encoding/json"
-	"flag"
-	"image"
-	"image/png"
-
-	"gioui.org/app"
-	"gioui.org/io/system"
-	"gioui.org/op"
-	"gioui.org/op/paint"
-	"gioui.org/unit"
-	qrcode "github.com/skip2/go-qrcode"
-)
-
-var vpnApiAddr = flag.String("vpn-api-addr", "", "VPN API server address")
-
-type config struct {
-	VPNApiAddr string `json:"vpn_api_addr"`
-	Message    []byte `json:"message"`
-	Signature  []byte `json:"signature"`
-}
-
-func prepareConfigQRCode(vc *VPNApiClient) (*image.Image, error) {
-	message := []byte("Hello PCloud")
-	signature, err := vc.Sign(message)
-	if err != nil {
-		return nil, err
-	}
-	c := config{
-		*vpnApiAddr,
-		message,
-		signature,
-	}
-	var data bytes.Buffer
-	if err := json.NewEncoder(&data).Encode(c); err != nil {
-		return nil, err
-	}
-	qr, err := qrcode.Encode(data.String(), qrcode.Medium, 1024)
-	if err != nil {
-		return nil, err
-	}
-	img, err := png.Decode(bytes.NewReader(qr))
-	if err != nil {
-		return nil, err
-	}
-	return &img, nil
-}
-
-func main() {
-	flag.Parse()
-	go func() {
-		vc := &VPNApiClient{
-			*vpnApiAddr,
-		}
-		img, err := prepareConfigQRCode(vc)
-		if err != nil {
-			panic(err)
-		}
-		w := app.NewWindow(
-			app.Size(unit.Px(1024), unit.Px(1024)),
-			app.Title("PCloud"),
-		)
-		ops := new(op.Ops)
-		for e := range w.Events() {
-			switch e := e.(type) {
-			case system.FrameEvent:
-				ops.Reset()
-				paint.NewImageOp(*img).Add(ops)
-				paint.PaintOp{}.Add(ops)
-				e.Frame(ops)
-			}
-		}
-	}()
-	app.Main()
-}