From 7e4d74cbfc0209ab0a410701a5714bd1db483e6a Mon Sep 17 00:00:00 2001
From: Jeff Becker <jeff@i2p.rocks>
Date: Mon, 26 Nov 2018 17:46:22 -0500
Subject: [PATCH] add initial jni stuff for lokinet android. i fucking hate
 android so god damn much.

---
 CMakeLists.txt                                |  4 +-
 Makefile                                      |  1 +
 android/AndroidManifest.xml                   | 31 +++----
 android/build.gradle                          |  1 +
 android/res/layout/activity_perms_asker.xml   |  2 +-
 .../res/layout/activity_perms_explanation.xml |  2 +-
 android/res/values/strings.xml                |  4 +
 .../network/loki/lokinet/LokiNetActivity.java | 64 ++++++--------
 .../src/network/loki/lokinet/Lokinet_JNI.java | 12 +++
 .../loki/lokinet/PermsAskerActivity.java      | 26 +++---
 include/llarp.h                               |  4 +
 include/llarp/crypto.h                        |  2 +-
 include/llarp/ev.h                            | 14 ++++
 include/llarp/handlers/tun.hpp                |  5 ++
 include/llarp/router.h                        |  2 +-
 include/tuntap.h                              |  4 +
 jni/lokinet_android.cpp                       | 83 +++++++++++++++++--
 jni/network_loki_lokinet_Lokinet_JNI.h        |  9 ++
 llarp/android/ifaddrs.c                       |  2 +
 llarp/config.cpp                              |  4 +
 llarp/context.cpp                             | 33 +++++---
 llarp/ev.cpp                                  |  6 ++
 llarp/ev.hpp                                  | 20 +++++
 llarp/ev_epoll.hpp                            | 45 +++++++---
 llarp/handlers/exit.cpp                       |  2 +-
 llarp/handlers/tun.cpp                        | 13 +++
 llarp/router.cpp                              | 24 +++---
 llarp/router.hpp                              |  2 +-
 llarp/service/context.cpp                     |  7 +-
 vendor/libtuntap-master/tuntap-unix-linux.c   | 25 ++++--
 vendor/libtuntap-master/tuntap.cpp            |  3 +-
 31 files changed, 331 insertions(+), 125 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 305f48d94..1778878df 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -50,7 +50,9 @@ endif(WIN32)
 if(DEBIAN)
   add_definitions(-DDEBIAN)
 else()
-  set(CRYPTO_FLAGS -march=native)
+  if( NOT ANDROID)
+    set(CRYPTO_FLAGS -march=native)
+  endif()
 endif()
 
 set(CMAKE_THREAD_PREFER_PTHREAD TRUE)
diff --git a/Makefile b/Makefile
index 6f6b8a78f..bb5a64c29 100644
--- a/Makefile
+++ b/Makefile
@@ -165,6 +165,7 @@ android-gradle: android-gradle-prepare
 	cd $(ANDROID_DIR) && JAVA_HOME=$(JAVA_HOME) $(GRADLE) clean assemble
 
 android: android-gradle
+	cp -f $(ANDROID_DIR)/build/outputs/apk/*.apk $(REPO)
 
 windows-configure: clean
 	mkdir -p '$(BUILD_ROOT)'
diff --git a/android/AndroidManifest.xml b/android/AndroidManifest.xml
index 54b24f709..f4a081ccb 100755
--- a/android/AndroidManifest.xml
+++ b/android/AndroidManifest.xml
@@ -13,7 +13,8 @@
     <uses-permission android:name="android.permission.INTERNET" /> <!-- normal perm, per https://developer.android.com/guide/topics/permissions/normal-permissions.html -->
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
     <uses-permission android:name="android.permission.READ_PHONE_STATE" />
-    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> <!-- normal perm -->
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> 
+    <!-- normal perm -->
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
     <application
         android:allowBackup="true"
@@ -26,9 +27,9 @@
                 <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
             </intent-filter>
         </receiver>
-
+   
         <activity
-            android:name=".PermsAskerActivity"
+            android:name=".LokiNetActivity"
             android:label="@string/app_name">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
@@ -36,22 +37,14 @@
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
-        <activity
-            android:name=".LokiNetActivity"
-            android:label="@string/app_name" />
-
-        <service
-            android:name=".ForegroundService"
-            android:enabled="true" />
-
-        <activity
-            android:name=".PermsExplanationActivity"
-            android:label="@string/title_activity_perms_asker_prompt"
-            android:parentActivityName=".PermsAskerActivity">
-            <meta-data
-                android:name="android.support.PARENT_ACTIVITY"
-                android:value="network.loki.lokinet.PermsAskerActivity" />
-        </activity>
+        <service android:name=".LokinetService"
+             android:enabled="true"
+             android:exported="true"
+            android:permission="android.permission.BIND_VPN_SERVICE">
+        <intent-filter>
+            <action android:name="android.net.VpnService"/>
+        </intent-filter>
+        </service>
     </application>
 
 </manifest>
diff --git a/android/build.gradle b/android/build.gradle
index 39b72b2ed..edbd3e670 100644
--- a/android/build.gradle
+++ b/android/build.gradle
@@ -34,6 +34,7 @@ android {
             cmake {
                 targets "lokinetandroid"
                 arguments "-DANDROID=ON", "-DANDROID_STL=c++_static"
+                cppFlags "-fexceptions"
             }
         }
         packagingOptions{
diff --git a/android/res/layout/activity_perms_asker.xml b/android/res/layout/activity_perms_asker.xml
index 947436a09..4afe5c037 100644
--- a/android/res/layout/activity_perms_asker.xml
+++ b/android/res/layout/activity_perms_asker.xml
@@ -22,6 +22,6 @@
         android:id="@+id/button_request_write_ext_storage_perms"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Retry requesting the SD card write permissions"
+        android:text="Retry requesting VPN"
         android:visibility="gone"/>
 </LinearLayout>
\ No newline at end of file
diff --git a/android/res/layout/activity_perms_explanation.xml b/android/res/layout/activity_perms_explanation.xml
index 0713479c0..08445664e 100644
--- a/android/res/layout/activity_perms_explanation.xml
+++ b/android/res/layout/activity_perms_explanation.xml
@@ -15,7 +15,7 @@
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_marginBottom="@dimen/horizontal_page_margin"
-        android:text="SD card write access is required to write the keys and other files on an SD card."
+        android:text="VPN permissions are required for lokinet usage."
         />
 
     <Button
diff --git a/android/res/values/strings.xml b/android/res/values/strings.xml
index 49bc52272..16423a986 100755
--- a/android/res/values/strings.xml
+++ b/android/res/values/strings.xml
@@ -12,4 +12,8 @@
     <string name="stopped">lokinet has stopped</string>
     <string name="remaining">remaining</string>
     <string name="title_activity_perms_asker_prompt">Prompt</string>
+    <string name="bootstrap_ok">got bootstrap node info</string>
+    <string name="bootstrap_fail">failed to bootstrap</string>
+    <string name="netdb_create_fail">failed to create netdb directory</string>
+    <string name="vpn_setup_fail">failed to set up vpn tunnel</string>
 </resources>
diff --git a/android/src/network/loki/lokinet/LokiNetActivity.java b/android/src/network/loki/lokinet/LokiNetActivity.java
index 748b4d33e..5389cc94b 100755
--- a/android/src/network/loki/lokinet/LokiNetActivity.java
+++ b/android/src/network/loki/lokinet/LokiNetActivity.java
@@ -35,6 +35,8 @@ public class LokiNetActivity extends Activity {
 	private TextView textView;
 	private static final String DefaultBootstrapURL = "https://i2p.rocks/bootstrap.signed";
 
+	private AsyncBootstrap bootstrapper;
+
 	@Override
 	public void onCreate(Bundle savedInstanceState) {
 		super.onCreate(savedInstanceState);
@@ -65,14 +67,18 @@ public class LokiNetActivity extends Activity {
 		}
 	}
 
-	public void startLokinet() {
-
+	public void startLokinet()
+	{
+		if(bootstrapper != null)
+			return;
+		bootstrapper = new AsyncBootstrap();
+		bootstrapper.execute(DefaultBootstrapURL);
 	}
 
 	public void runLokinetService()
 	{
-		bindService(new Intent(LokiNetActivity.this,
-				ForegroundService.class), mConnection, Context.BIND_AUTO_CREATE);
+		startService(new Intent(LokiNetActivity.this,
+				LokinetService.class));
 	}
 
 	@Override
@@ -81,29 +87,41 @@ public class LokiNetActivity extends Activity {
 		textView = null;
 	}
 
+	public File getRootDir()
+	{
+		return getFilesDir();
+	}
+
 	private class AsyncBootstrap extends AsyncTask<String, String, String>
 	{
 		public String doInBackground(String ... urls) {
 			try
 			{
-				File bootstrapFile = new File(getCacheDir(), "bootstrap.signed");
+				File bootstrapFile = new File(getRootDir(), "bootstrap.signed");
 				URL bootstrapURL = new URL(urls[0]);
 				InputStream instream = bootstrapURL.openStream();
 				writeFile(bootstrapFile, instream);
 				instream.close();
-				return "downloaded";
+				return getString(R.string.bootstrap_ok);
 			}
 			catch(Exception thrown)
 			{
-				return thrown.getLocalizedMessage();
+				return getString(R.string.bootstrap_fail) + ": " + throwableToString(thrown);
 			}
 		}
 		public void onPostExecute(String val) {
-			final File configFile = new File(getCacheDir(), "daemon.ini");
-			runLokinetService();
+			textView.setText(val);
+			if(val.equals(getString(R.string.bootstrap_ok)))
+				runLokinetService();
+			bootstrapDone();
 		}
 	}
 
+	private void bootstrapDone()
+	{
+		bootstrapper = null;
+	}
+
 	private CharSequence throwableToString(Throwable tr) {
 		StringWriter sw = new StringWriter(8192);
 		PrintWriter pw = new PrintWriter(sw);
@@ -112,33 +130,6 @@ public class LokiNetActivity extends Activity {
 		return sw.toString();
 	}
 
-	private ForegroundService boundService;
-	// private LocalService mBoundService;
-	
-	private ServiceConnection mConnection = new ServiceConnection() {
-		public void onServiceConnected(ComponentName className, IBinder service) {
-			// This is called when the connection with the service has been
-			// established, giving us the service object we can use to
-			// interact with the service.  Because we have bound to a explicit
-			// service that we know is running in our own process, we can
-			// cast its IBinder to a concrete class and directly access it.
-			boundService = ((ForegroundService.LocalBinder)service).getService();
-			textView.setText(R.id.loaded);
-			// Tell the user about this for our demo.
-			//		Toast.makeText(Binding.this, R.string.local_service_connected,
-			//		Toast.LENGTH_SHORT).show();
-		}
-		
-		public void onServiceDisconnected(ComponentName className) {
-			// This is called when the connection with the service has been
-			// unexpectedly disconnected -- that is, its process crashed.
-			// Because it is running in our same process, we should never
-			// see this happen.
-			//		mBoundService = null;
-			//		Toast.makeText(Binding.this, R.string.local_service_disconnected,
-			//		Toast.LENGTH_SHORT).show();
-		}
-	};
 	
 	
 	@Override
@@ -160,7 +151,6 @@ public class LokiNetActivity extends Activity {
 				startLokinet();
 				return true;
 			case R.id.action_stop:
-				Lokinet_JNI.stopLokinet();
 				return true;
 		}
 		
diff --git a/android/src/network/loki/lokinet/Lokinet_JNI.java b/android/src/network/loki/lokinet/Lokinet_JNI.java
index 7dc443672..eb3a2ebba 100644
--- a/android/src/network/loki/lokinet/Lokinet_JNI.java
+++ b/android/src/network/loki/lokinet/Lokinet_JNI.java
@@ -17,11 +17,23 @@ public class Lokinet_JNI {
      */
     public static native void stopLokinet();
 
+    /** get interface address we want */
+    public static native String getIfAddr();
+
+    /** get interface address range we want */
+    public static native int getIfRange();
+
     /**
      * change network status
      */
 	public static native void onNetworkStateChanged(boolean isConnected);
 
+    /**
+     * set vpn network interface fd
+     * @param fd the file descriptor of the vpn interface
+     */
+    public static native void setVPNFileDescriptor(int fd);
+
     /**
      * load jni libraries
      */
diff --git a/android/src/network/loki/lokinet/PermsAskerActivity.java b/android/src/network/loki/lokinet/PermsAskerActivity.java
index f560e4617..f71d0608c 100644
--- a/android/src/network/loki/lokinet/PermsAskerActivity.java
+++ b/android/src/network/loki/lokinet/PermsAskerActivity.java
@@ -15,21 +15,22 @@ import java.lang.reflect.Method;
 //android.permission.WRITE_EXTERNAL_STORAGE
 public class PermsAskerActivity extends Activity {
 
-    private static final int PERMISSION_WRITE_EXTERNAL_STORAGE = 0;
+    private static final int PERMISSION_VPN = 0;
 
     private Button button_request_write_ext_storage_perms;
     private TextView textview_retry;
-
+    
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
+        startMainActivity();
+        /*
         //if less than Android 6, no runtime perms req system present
         if (android.os.Build.VERSION.SDK_INT < 23) {
-            startMainActivity();
+            
             return;
         }
 
-
         setContentView(R.layout.activity_perms_asker);
         button_request_write_ext_storage_perms = (Button) findViewById(R.id.button_request_write_ext_storage_perms);
         textview_retry = (TextView) findViewById(R.id.textview_retry);
@@ -41,6 +42,7 @@ public class PermsAskerActivity extends Activity {
             }
         });
         request_write_ext_storage_perms();
+        */
     }
 
     private void request_write_ext_storage_perms() {
@@ -63,7 +65,7 @@ public class PermsAskerActivity extends Activity {
         Integer resultObj;
         try {
             resultObj = (Integer) methodCheckPermission.invoke(
-                    this, Manifest.permission.WRITE_EXTERNAL_STORAGE);
+                    this, Manifest.permission.BIND_VPN_SERVICE);
         } catch (Throwable e) {
             throw new RuntimeException(e);
         }
@@ -74,7 +76,7 @@ public class PermsAskerActivity extends Activity {
             Boolean aBoolean;
             try {
                 aBoolean = (Boolean) method_shouldShowRequestPermissionRationale.invoke(this,
-                        Manifest.permission.WRITE_EXTERNAL_STORAGE);
+                        Manifest.permission.BIND_VPN_SERVICE);
             } catch (Exception e) {
                 throw new RuntimeException(e);
             }
@@ -92,8 +94,8 @@ public class PermsAskerActivity extends Activity {
 
                 try {
                     method_requestPermissions.invoke(this,
-                            new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
-                            PERMISSION_WRITE_EXTERNAL_STORAGE);
+                            new String[]{Manifest.permission.BIND_VPN_SERVICE},
+                            PERMISSION_VPN);
                 } catch (Exception e) {
                     throw new RuntimeException(e);
                 }
@@ -105,7 +107,7 @@ public class PermsAskerActivity extends Activity {
     public void onRequestPermissionsResult(int requestCode,
                                            String permissions[], int[] grantResults) {
         switch (requestCode) {
-            case PERMISSION_WRITE_EXTERNAL_STORAGE: {
+            case PERMISSION_VPN: {
                 // If request is cancelled, the result arrays are empty.
                 if (grantResults.length > 0
                         && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
@@ -119,7 +121,7 @@ public class PermsAskerActivity extends Activity {
 
                     // permission denied, boo! Disable the
                     // functionality that depends on this permission.
-                    textview_retry.setText("SD card write permission denied, you need to allow this to continue");
+                    textview_retry.setText("you need to allow this to continue");
                     textview_retry.setVisibility(TextView.VISIBLE);
                     button_request_write_ext_storage_perms.setVisibility(Button.VISIBLE);
                 }
@@ -158,8 +160,8 @@ public class PermsAskerActivity extends Activity {
                 }
                 try {
                     method_requestPermissions.invoke(this,
-                            new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
-                            PERMISSION_WRITE_EXTERNAL_STORAGE);
+                            new String[]{Manifest.permission.BIND_VPN_SERVICE},
+                            PERMISSION_VPN);
                 } catch (Exception e) {
                     throw new RuntimeException(e);
                 }
diff --git a/include/llarp.h b/include/llarp.h
index acfc7c749..2db8b4808 100644
--- a/include/llarp.h
+++ b/include/llarp.h
@@ -35,6 +35,10 @@ extern "C"
   void
   llarp_main_signal(struct llarp_main *ptr, int sig);
 
+  /// give main context a vpn file descriptor (android/ios)
+  void
+  llarp_main_inject_vpn_fd(struct llarp_main * m, int fd);
+
   /// setup main context
   int
   llarp_main_setup(struct llarp_main *ptr);
diff --git a/include/llarp/crypto.h b/include/llarp/crypto.h
index 6b7211e9b..5c6fbd08f 100644
--- a/include/llarp/crypto.h
+++ b/include/llarp/crypto.h
@@ -29,7 +29,7 @@
 #define PQ_CIPHERTEXTSIZE crypto_kem_CIPHERTEXTBYTES
 #define PQ_PUBKEYSIZE crypto_kem_PUBLICKEYBYTES
 #define PQ_SECRETKEYSIZE crypto_kem_SECRETKEYBYTES
-#define PQ_KEYPAIRSIZE (PQ_SECRETKEYSIZE + PQ_SECRETKEYSIZE)
+#define PQ_KEYPAIRSIZE (PQ_SECRETKEYSIZE + PQ_PUBKEYSIZE)
 
 /// label functors
 
diff --git a/include/llarp/ev.h b/include/llarp/ev.h
index 75107ba60..15cafd049 100644
--- a/include/llarp/ev.h
+++ b/include/llarp/ev.h
@@ -166,6 +166,14 @@ llarp_tcp_acceptor_close(struct llarp_tcp_acceptor *);
 #define IFNAMSIZ (16)
 #endif
 
+
+struct llarp_fd_promise;
+
+/// wait until the fd promise is set
+int
+llarp_fd_promise_wait_for_value(struct llarp_fd_promise * promise);
+
+
 struct llarp_tun_io
 {
   // TODO: more info?
@@ -175,6 +183,11 @@ struct llarp_tun_io
 
   void *user;
   void *impl;
+
+  /// functor for getting a promise that returns the vpn fd 
+  /// dont set me if you don't know how to use this
+  struct llarp_fd_promise * (*get_fd_promise)(struct llarp_tun_io *);
+
   struct llarp_ev_loop *parent;
   /// called when we are able to write right before we write
   /// this happens after reading packets
@@ -189,6 +202,7 @@ struct llarp_tun_io
 bool
 llarp_ev_add_tun(struct llarp_ev_loop *ev, struct llarp_tun_io *tun);
 
+
 /// async write a packet on tun interface
 /// returns true if queued, returns false on drop
 bool
diff --git a/include/llarp/handlers/tun.hpp b/include/llarp/handlers/tun.hpp
index d1b33c0b9..5ba76ceb6 100644
--- a/include/llarp/handlers/tun.hpp
+++ b/include/llarp/handlers/tun.hpp
@@ -13,6 +13,7 @@ namespace llarp
 {
   namespace handlers
   {
+
     static const int DefaultTunNetmask    = 16;
     static const char DefaultTunIfname[]  = "lokinet0";
     static const char DefaultTunDstAddr[] = "10.10.0.1";
@@ -73,6 +74,7 @@ namespace llarp
 #endif
 
       llarp_tun_io tunif;
+      std::unique_ptr<llarp_fd_promise> Promise;
 
       /// called before writing to tun interface
       static void
@@ -168,6 +170,9 @@ namespace llarp
       /// up interface
       std::promise< bool > m_TunSetupResult;
 #endif
+
+      std::promise<int> m_VPNPromise;
+
       /// DNS server per tun
       struct dnsd_context dnsd;
       /// DNS loki lookup subsystem configuration (also holds optional iptracker
diff --git a/include/llarp/router.h b/include/llarp/router.h
index f58a00472..6185d132e 100644
--- a/include/llarp/router.h
+++ b/include/llarp/router.h
@@ -21,7 +21,7 @@ llarp_free_router(struct llarp_router **router);
 bool
 llarp_configure_router(struct llarp_router *router, struct llarp_config *conf);
 
-void
+bool
 llarp_run_router(struct llarp_router *router, struct llarp_nodedb *nodedb);
 
 void
diff --git a/include/tuntap.h b/include/tuntap.h
index 11c38b92e..7464eb449 100644
--- a/include/tuntap.h
+++ b/include/tuntap.h
@@ -137,6 +137,10 @@ extern "C"
 
   struct device
   {
+    /** set me on ios and android to block on a promise for the fd */
+    int (*obtain_fd)(struct device *);
+    /** user data */
+    void * user;
     t_tun tun_fd;
     int ctrl_sock;
     int flags; /* ifr.ifr_flags on Unix */
diff --git a/jni/lokinet_android.cpp b/jni/lokinet_android.cpp
index 52c445206..ce4e30f28 100755
--- a/jni/lokinet_android.cpp
+++ b/jni/lokinet_android.cpp
@@ -26,7 +26,7 @@ struct AndroidMain
   bool
   ReloadConfig()
   {
-    if(!m_Impl)
+    if(!m_impl)
       return false;
     llarp_main_signal(m_impl, SIGHUP);
     return true;
@@ -41,6 +41,12 @@ struct AndroidMain
     m_impl = llarp_main_init(configFile.c_str(), true);
     if(m_impl == nullptr)
       return false;
+    if(llarp_main_setup(m_impl))
+    {
+      llarp_main_free(m_impl);
+      m_impl = nullptr;
+      return false;
+    }
     m_thread = new std::thread(std::bind(&AndroidMain::Run, this));
     return true;
   }
@@ -56,18 +62,57 @@ struct AndroidMain
   void
   Run()
   {
-    llarp_main_run(m_impl);
+    if(llarp_main_run(m_impl))
+    {
+      // on error
+      llarp::LogError("daemon run fail");
+      llarp_main * ptr = m_impl;
+      m_impl = nullptr;
+      llarp_main_signal(ptr, SIGINT);
+      llarp_main_free(ptr);
+    }
+  }
+
+  const char * GetIfAddr()
+  {
+    if(m_impl)
+    {
+      auto tun = main_router_getFirstTunEndpoint(m_impl);
+      if(tun)
+        return tun->tunif.ifaddr;
+    }
+     return "";
+  }
+
+  int GetIfRange() const 
+  {
+    if(m_impl)
+    {
+      auto tun = main_router_getFirstTunEndpoint(m_impl);
+      if(tun)
+        return tun->tunif.netmask;
+    }
+    return -1;
+  }
+
+  void 
+  SetVPN_FD(int fd)
+  {
+    if(m_impl)
+      llarp_main_inject_vpn_fd(m_impl, fd);
   }
 
   /// stop daemon thread
   void
   Stop()
   {
-    llarp_main_signal(m_impl, SIGINT);
+    if(m_impl)
+      llarp_main_signal(m_impl, SIGINT);
     m_thread->join();
     delete m_thread;
     m_thread = nullptr;
-    llarp_main_free(m_impl);
+    if(m_impl)
+      llarp_main_free(m_impl);
     m_impl = nullptr;
   }
 
@@ -86,7 +131,7 @@ extern "C"
   }
 
   JNIEXPORT jstring JNICALL
-  Java_network_loki_lokinet_Lokinet_1JNI_startLokinet(JNIEnv* env, jclass jcl,
+  Java_network_loki_lokinet_Lokinet_1JNI_startLokinet(JNIEnv* env, jclass,
                                                       jstring configfile)
   {
     if(daemon->Running())
@@ -107,17 +152,41 @@ extern "C"
         return env->NewStringUTF("failed to start daemon");
     }
     else
-      return ev->NewStringUTF("failed to configure daemon");
+      return env->NewStringUTF("failed to configure daemon");
   }
 
   JNIEXPORT void JNICALL
-  Java_network_loki_lokinet_Lokinet_1JNI_stopLokinet(JNIEnv* env, jclass)
+  Java_network_loki_lokinet_Lokinet_1JNI_stopLokinet(JNIEnv*, jclass)
   {
     if(daemon->Running())
     {
       daemon->Stop();
     }
   }
+ 
+  JNIEXPORT void JNICALL
+  Java_network_loki_lokinet_Lokinet_1JNI_setVPNFileDescriptor(JNIEnv*, jclass, jint fd)
+  {
+    daemon->SetVPN_FD(fd);
+  }
+
+  JNIEXPORT jstring JNICALL Java_network_loki_lokinet_Lokinet_1JNI_getIfAddr
+  (JNIEnv * env, jclass)
+  {
+    if(daemon)
+      return env->NewStringUTF(daemon->GetIfAddr());
+    else
+      return env->NewStringUTF("");
+  }
+
+  JNIEXPORT jint JNICALL Java_network_loki_lokinet_Lokinet_1JNI_getIfRange
+  (JNIEnv *, jclass)
+  {
+   if(daemon)
+      return daemon->GetIfRange();
+    else
+      return -1;
+  }
 
   JNIEXPORT void JNICALL
   Java_network_loki_lokinet_Lokinet_1JNI_onNetworkStateChanged(JNIEnv*, jclass,
diff --git a/jni/network_loki_lokinet_Lokinet_JNI.h b/jni/network_loki_lokinet_Lokinet_JNI.h
index e40a8c52c..035c4e248 100644
--- a/jni/network_loki_lokinet_Lokinet_JNI.h
+++ b/jni/network_loki_lokinet_Lokinet_JNI.h
@@ -23,6 +23,12 @@ JNIEXPORT jstring JNICALL Java_network_loki_lokinet_Lokinet_1JNI_getABICompiledW
 JNIEXPORT jstring JNICALL Java_network_loki_lokinet_Lokinet_1JNI_startLokinet
   (JNIEnv *, jclass, jstring);
 
+JNIEXPORT jstring JNICALL Java_network_loki_lokinet_Lokinet_1JNI_getIfAddr
+  (JNIEnv *, jclass);
+
+JNIEXPORT jint JNICALL Java_network_loki_lokinet_Lokinet_1JNI_getIfRange
+  (JNIEnv *, jclass);
+
 /*
  * Class:     network_loki_lokinet_Lokinet_JNI
  * Method:    stopLokinet
@@ -31,6 +37,9 @@ JNIEXPORT jstring JNICALL Java_network_loki_lokinet_Lokinet_1JNI_startLokinet
 JNIEXPORT void JNICALL Java_network_loki_lokinet_Lokinet_1JNI_stopLokinet
   (JNIEnv *, jclass);
 
+JNIEXPORT void JNICALL Java_network_loki_lokinet_Lokinet_1JNI_setVPNFileDescriptor
+  (JNIEnv *, jclass, jint);
+
 /*
  * Class:     network_loki_lokinet_Lokinet_JNI
  * Method:    onNetworkStateChanged
diff --git a/llarp/android/ifaddrs.c b/llarp/android/ifaddrs.c
index 87e6d2a6c..3f6faf611 100644
--- a/llarp/android/ifaddrs.c
+++ b/llarp/android/ifaddrs.c
@@ -327,6 +327,7 @@ interpretLink(struct nlmsghdr *p_hdr, struct ifaddrs **p_resultList)
       l_rta = RTA_NEXT(l_rta, l_rtaSize))
   {
     void *l_rtaData      = RTA_DATA(l_rta);
+    (void) l_rtaData;
     size_t l_rtaDataSize = RTA_PAYLOAD(l_rta);
     switch(l_rta->rta_type)
     {
@@ -454,6 +455,7 @@ interpretAddr(struct nlmsghdr *p_hdr, struct ifaddrs **p_resultList,
       l_rta = RTA_NEXT(l_rta, l_rtaSize))
   {
     void *l_rtaData      = RTA_DATA(l_rta);
+    (void) l_rtaData;
     size_t l_rtaDataSize = RTA_PAYLOAD(l_rta);
 
     switch(l_rta->rta_type)
diff --git a/llarp/config.cpp b/llarp/config.cpp
index 3a74da899..a69a55da5 100644
--- a/llarp/config.cpp
+++ b/llarp/config.cpp
@@ -164,7 +164,11 @@ llarp_generic_ensure_config(std::ofstream &f, std::string basepath)
 // will this break reproducibility rules?
 // (probably)
 #ifdef __linux__
+#ifdef ANDROID
+  f << "bind=127.0.0.1:1153" << std::endl;
+#else
   f << "bind=127.3.2.1:53" << std::endl;
+#endif
 #else
   f << "bind=127.0.0.1:53" << std::endl;
 #endif
diff --git a/llarp/context.cpp b/llarp/context.cpp
index 2e29e0227..df618c7d0 100644
--- a/llarp/context.cpp
+++ b/llarp/context.cpp
@@ -13,6 +13,8 @@
 #include <pthread_np.h>
 #endif
 
+#include "ev.hpp"
+
 namespace llarp
 {
   Context::~Context()
@@ -154,10 +156,7 @@ namespace llarp
       llarp::LogError("Failed to configure router");
       return 1;
     }
-    // set nodedb, load our RC, establish DHT
-    llarp_run_router(router, nodedb);
-
-    return 0;  // success
+    return 0;
   }
 
   int
@@ -174,7 +173,9 @@ namespace llarp
         return 1;
       }
     }
-
+    // run
+    if(!llarp_run_router(router, nodedb))
+      return 1;   // success
     // run net io thread
     llarp::LogInfo("running mainloop");
     llarp_ev_loop_run_single_process(mainloop, worker, logic);
@@ -296,6 +297,17 @@ extern "C"
     ptr->ctx->HandleSignal(sig);
   }
 
+  void 
+  llarp_main_inject_vpn_fd(struct llarp_main * ptr, int fd)
+  {
+    llarp::handlers::TunEndpoint * tun =  ptr->ctx->router->hiddenServiceContext.getFirstTun();
+    if(!tun)
+      return;
+    if(!tun->Promise)
+      return;
+    tun->Promise->Set(fd);
+  }
+
   int
   llarp_main_setup(struct llarp_main *ptr)
   {
@@ -308,7 +320,7 @@ extern "C"
     if(!ptr)
     {
       llarp::LogError("No ptr passed in");
-      return 0;
+      return 1;
     }
     return ptr->ctx->Run();
   }
@@ -448,8 +460,8 @@ extern "C"
   main_router_mapAddress(struct llarp_main *ptr,
                          const llarp::service::Address &addr, uint32_t ip)
   {
-    auto *endpoint = &ptr->ctx->router->hiddenServiceContext;
-    return endpoint->MapAddress(addr, llarp::huint32_t{ip});
+    auto &endpoint = ptr->ctx->router->hiddenServiceContext;
+    return endpoint.MapAddress(addr, llarp::huint32_t{ip});
   }
 
   bool
@@ -463,8 +475,9 @@ extern "C"
   llarp::handlers::TunEndpoint *
   main_router_getFirstTunEndpoint(struct llarp_main *ptr)
   {
-    auto *context = &ptr->ctx->router->hiddenServiceContext;
-    return context->getFirstTun();
+    if(ptr && ptr->ctx && ptr->ctx->router)
+      return ptr->ctx->router->hiddenServiceContext.getFirstTun();
+    return nullptr;
   }
 
   //#include <llarp/service/context.hpp>
diff --git a/llarp/ev.cpp b/llarp/ev.cpp
index c80cee18b..4c2617ebb 100644
--- a/llarp/ev.cpp
+++ b/llarp/ev.cpp
@@ -20,6 +20,7 @@
 #error No async event loop for your platform, subclass llarp_ev_loop
 #endif
 
+
 void
 llarp_ev_loop_alloc(struct llarp_ev_loop **ev)
 {
@@ -57,6 +58,11 @@ llarp_ev_loop_run(struct llarp_ev_loop *ev, struct llarp_logic *logic)
   return 0;
 }
 
+int llarp_fd_promise_wait_for_value(struct llarp_fd_promise * p)
+{
+  return p->Get();
+}
+
 void
 llarp_ev_loop_run_single_process(struct llarp_ev_loop *ev,
                                  struct llarp_threadpool *tp,
diff --git a/llarp/ev.hpp b/llarp/ev.hpp
index 23ce9e02c..515c14342 100644
--- a/llarp/ev.hpp
+++ b/llarp/ev.hpp
@@ -14,6 +14,8 @@
 
 #ifdef _WIN32
 #include <variant>
+#else
+#include <sys/un.h>
 #endif
 
 #ifndef MAX_WRITE_QUEUE_SIZE
@@ -608,6 +610,24 @@ namespace llarp
 
 };  // namespace llarp
 
+struct llarp_fd_promise
+{
+  llarp_fd_promise(std::promise<int> * p) : _impl(p) {}
+  std::promise<int> * _impl;
+  
+  void Set(int fd)
+  {
+    _impl->set_value(fd);
+  }
+
+  int Get()
+  {
+    auto future = _impl->get_future();
+    future.wait();
+    return future.get();
+  }
+};
+
 // this (nearly!) abstract base class
 // is overriden for each platform
 struct llarp_ev_loop
diff --git a/llarp/ev_epoll.hpp b/llarp/ev_epoll.hpp
index e693c5021..dbd3570b0 100644
--- a/llarp/ev_epoll.hpp
+++ b/llarp/ev_epoll.hpp
@@ -224,26 +224,46 @@ namespace llarp
       return ret;
     }
 
+    static int wait_for_fd_promise(struct device * dev)
+    {
+      llarp::tun *t = static_cast<llarp::tun *>(dev->user);
+      if(t->t->get_fd_promise)
+      {
+        struct llarp_fd_promise * promise = t->t->get_fd_promise(t->t);
+        if(promise)
+          return llarp_fd_promise_wait_for_value(promise);
+      }
+      return -1;
+    }
+
     bool
     setup()
     {
+      // for android
+      if(t->get_fd_promise)
+      {
+        tunif->obtain_fd = &wait_for_fd_promise;
+        tunif->user = this;
+      }
       llarp::LogDebug("set ifname to ", t->ifname);
       strncpy(tunif->if_name, t->ifname, sizeof(tunif->if_name));
-
       if(tuntap_start(tunif, TUNTAP_MODE_TUNNEL, 0) == -1)
       {
         llarp::LogWarn("failed to start interface");
         return false;
       }
-      if(tuntap_up(tunif) == -1)
+      if(t->get_fd_promise == nullptr)
       {
-        llarp::LogWarn("failed to put interface up: ", strerror(errno));
-        return false;
-      }
-      if(tuntap_set_ip(tunif, t->ifaddr, t->ifaddr, t->netmask) == -1)
-      {
-        llarp::LogWarn("failed to set ip");
-        return false;
+        if(tuntap_up(tunif) == -1)
+        {
+          llarp::LogWarn("failed to put interface up: ", strerror(errno));
+          return false;
+        }
+        if(tuntap_set_ip(tunif, t->ifaddr, t->ifaddr, t->netmask) == -1)
+        {
+          llarp::LogWarn("failed to set ip");
+          return false;
+        }
       }
       fd = tunif->tun_fd;
       if(fd == -1)
@@ -257,6 +277,8 @@ namespace llarp
 
     ~tun()
     {
+      if(tunif)
+        tuntap_destroy(tunif);
     }
   };
 };  // namespace llarp
@@ -485,7 +507,10 @@ struct llarp_epoll_loop : public llarp_ev_loop
   create_tun(llarp_tun_io* tun)
   {
     llarp::tun* t = new llarp::tun(tun, this);
-    if(t->setup())
+    if(tun->get_fd_promise)
+    {
+
+    } else if(t->setup())
     {
       return t;
     }
diff --git a/llarp/handlers/exit.cpp b/llarp/handlers/exit.cpp
index ff42293c4..5b7031cf0 100644
--- a/llarp/handlers/exit.cpp
+++ b/llarp/handlers/exit.cpp
@@ -23,7 +23,7 @@ namespace llarp
     ExitEndpoint::ExitEndpoint(const std::string &name, llarp_router *r)
         : m_Router(r)
         , m_Name(name)
-        , m_Tun{{0}, 0, {0}, 0, 0, 0, 0, 0, 0}
+        , m_Tun{{0}, 0, {0}, 0, 0, 0, 0, 0, 0, 0}
         , m_InetToNetwork(name + "_exit_rx", r->netloop, r->netloop)
 
     {
diff --git a/llarp/handlers/tun.cpp b/llarp/handlers/tun.cpp
index cf75577cb..765ddc3a8 100644
--- a/llarp/handlers/tun.cpp
+++ b/llarp/handlers/tun.cpp
@@ -8,16 +8,29 @@
 #include <sys/socket.h>
 #include <netdb.h>
 #endif
+#include "ev.hpp"
 
 namespace llarp
 {
   namespace handlers
   {
+
+    static llarp_fd_promise * get_tun_fd_promise(llarp_tun_io * tun)
+    {
+      return static_cast<TunEndpoint *>(tun->user)->Promise.get();
+    }
+
     TunEndpoint::TunEndpoint(const std::string &nickname, llarp_router *r)
         : service::Endpoint(nickname, r)
         , m_UserToNetworkPktQueue(nickname + "_sendq", r->netloop, r->netloop)
         , m_NetworkToUserPktQueue(nickname + "_recvq", r->netloop, r->netloop)
     {
+#ifdef ANDROID      
+      tunif.get_fd_promise = &get_tun_fd_promise;
+      Promise.reset(new llarp_fd_promise(&m_VPNPromise));
+#else 
+      tunif.get_fd_promise = nullptr;
+#endif
       tunif.user    = this;
       tunif.netmask = DefaultTunNetmask;
       strncpy(tunif.ifaddr, DefaultTunSrcAddr, sizeof(tunif.ifaddr) - 1);
diff --git a/llarp/router.cpp b/llarp/router.cpp
index 56cedb308..567bf600a 100644
--- a/llarp/router.cpp
+++ b/llarp/router.cpp
@@ -703,7 +703,7 @@ llarp_router::async_verify_RC(const llarp::RouterContact &rc,
   llarp_nodedb_async_verify(job);
 }
 
-void
+bool
 llarp_router::Run()
 {
   if(enableRPCServer)
@@ -807,12 +807,12 @@ llarp_router::Run()
   if(!_rc.Sign(&crypto, identity))
   {
     llarp::LogError("failed to sign rc");
-    return;
+    return false;
   }
 
   if(!SaveRC())
   {
-    return;
+    return false;
   }
 
   llarp::LogInfo("have ", llarp_nodedb_num_loaded(nodedb), " routers");
@@ -821,6 +821,7 @@ llarp_router::Run()
   if(!outboundLink->Start(logic))
   {
     llarp::LogWarn("outbound link failed to start");
+    return false;
   }
 
   int IBLinksStarted = 0;
@@ -844,8 +845,7 @@ llarp_router::Run()
     if(!InitServiceNode())
     {
       llarp::LogError("Failed to initialize service node");
-      Close();
-      return;
+      return false;
     }
     delay = llarp_randint() % 50;
   }
@@ -860,16 +860,14 @@ llarp_router::Run()
     if(!_rc.Sign(&crypto, identity))
     {
       llarp::LogError("failed to regenerate keys and sign RC");
-      Close();
-      return;
+      return false;
     }
     // generate default hidden service
     llarp::LogInfo("setting up default network endpoint");
     if(!CreateDefaultHiddenService())
     {
       llarp::LogError("failed to set up default network endpoint");
-      Close();
-      return;
+      return false;
     }
   }
 
@@ -877,8 +875,7 @@ llarp_router::Run()
   if(!hiddenServiceContext.StartAll())
   {
     llarp::LogError("Failed to start hidden service context");
-    Close();
-    return;
+    return false;
   }
   llarp::PubKey ourPubkey = pubkey();
   llarp::LogInfo("starting dht context as ", ourPubkey);
@@ -886,6 +883,7 @@ llarp_router::Run()
   ScheduleTicker(1000);
   // delayed connect all
   llarp_logic_call_later(logic, {delay, this, &ConnectAll});
+  return true;
 }
 
 bool
@@ -1041,11 +1039,11 @@ llarp_configure_router(struct llarp_router *router, struct llarp_config *conf)
   return router->EnsureIdentity();
 }
 
-void
+bool
 llarp_run_router(struct llarp_router *router, struct llarp_nodedb *nodedb)
 {
   router->nodedb = nodedb;
-  router->Run();
+  return router->Run();
 }
 
 void
diff --git a/llarp/router.hpp b/llarp/router.hpp
index 28159a118..d0a93d6ac 100644
--- a/llarp/router.hpp
+++ b/llarp/router.hpp
@@ -200,7 +200,7 @@ struct llarp_router
   bool
   Ready();
 
-  void
+  bool
   Run();
 
   void
diff --git a/llarp/service/context.cpp b/llarp/service/context.cpp
index 45950139e..62599d510 100644
--- a/llarp/service/context.cpp
+++ b/llarp/service/context.cpp
@@ -45,9 +45,10 @@ namespace llarp
         llarp::LogError("No endpoints found");
         return nullptr;
       }
-      auto firstEndpoint   = m_Endpoints.begin();
-      auto *uniqueEndpoint = &firstEndpoint->second;
-      return uniqueEndpoint->get();
+      auto itr  = m_Endpoints.begin();
+      if(itr == m_Endpoints.end())
+        return nullptr;
+      return itr->second.get();
     }
 
     bool
diff --git a/vendor/libtuntap-master/tuntap-unix-linux.c b/vendor/libtuntap-master/tuntap-unix-linux.c
index dd8518972..7068355ea 100644
--- a/vendor/libtuntap-master/tuntap-unix-linux.c
+++ b/vendor/libtuntap-master/tuntap-unix-linux.c
@@ -36,6 +36,7 @@
 int
 tuntap_sys_start(struct device *dev, int mode, int tun)
 {
+  
   int fd;
   int persist;
   char *ifname;
@@ -79,15 +80,27 @@ tuntap_sys_start(struct device *dev, int mode, int tun)
     tuntap_log(TUNTAP_LOG_ERR, "Invalid parameter 'tun'");
     return -1;
   }
-
-  /* Open the clonable interface */
   fd = -1;
-  if((fd = open("/dev/net/tun", O_RDWR)) == -1)
+  if(dev->obtain_fd)
   {
-    tuntap_log(TUNTAP_LOG_ERR, "Can't open /dev/net/tun");
-    return -1;
+    // for android
+    fd = dev->obtain_fd(dev);
+    if(fd == -1)
+    {
+      tuntap_log(TUNTAP_LOG_ERR, "failed to get network interface");
+      return -1;
+    }
+    return fd;
+  }
+  else 
+  {
+    /* Open the clonable interface */
+    if((fd = open("/dev/net/tun", O_RDWR)) == -1)
+    {
+      tuntap_log(TUNTAP_LOG_ERR, "Can't open /dev/net/tun");
+      return -1;
+    }
   }
-
   /* Set the interface name, if any */
 
   if(fd > TUNTAP_ID_MAX)
diff --git a/vendor/libtuntap-master/tuntap.cpp b/vendor/libtuntap-master/tuntap.cpp
index 8962c62f0..5758c0b79 100644
--- a/vendor/libtuntap-master/tuntap.cpp
+++ b/vendor/libtuntap-master/tuntap.cpp
@@ -56,7 +56,8 @@ extern "C"
 
     if((dev = (struct device *)malloc(sizeof(*dev))) == NULL)
       return NULL;
-
+    dev->obtain_fd = nullptr;
+    dev->user = nullptr;
     (void)memset(dev->if_name, '\0', sizeof(dev->if_name));
     dev->tun_fd    = TUNFD_INVALID_VALUE;
     dev->ctrl_sock = -1;