tunnel: WIP add grpc

12 files changed, 860 insertions, 22 deletions

diff --git a/build.gradle b/build.gradle
index c13e124a..5bafb570 100644
--- a/build.gradle
+++ b/build.gradle
@@ -12,15 +12,27 @@ buildscript {
         datastoreVersion = '1.0.0'
         desugarVersion = '1.1.5'
         fragmentVersion = '1.4.1'
+        grpcVersion = '1.42.1'
+        gradleVersion = '4.0.1'
         jsr305Version = '3.0.2'
         junitVersion = '4.13.2'
         lifecycleRuntimeKtxVersion = '2.4.1'
         materialComponentsVersion = '1.5.0'
         preferenceVersion = '1.2.0'
+        protobufGradleVersion = '0.8.17'
+        protobufLiteVersion = '3.0.0'
+        protocVersion = '3.19.1'
         zxingEmbeddedVersion = '4.3.0'
 
         groupName = 'com.wireguard.android'
     }
+
+    dependencies {
+        classpath "com.google.protobuf:protobuf-gradle-plugin:$protobufGradleVersion"
+        // gradle plugin 4.0.1 required for fixing bug:
+        // https://stackoverflow.com/questions/62168227/getting-source-and-destination-must-be-different-error-while-building-project/62223434#62223434
+        //classpath "com.android.tools.build:gradle:$gradleVersion"
+    }
 }
 
 plugins {
diff --git a/tunnel/build.gradle b/tunnel/build.gradle
index 079d306f..a9a3d305 100644
--- a/tunnel/build.gradle
+++ b/tunnel/build.gradle
@@ -1,5 +1,6 @@
 plugins {
     id 'com.android.library'
+    id 'com.google.protobuf'
 }
 
 version wireguardVersionName
@@ -61,8 +62,38 @@ android {
 dependencies {
     implementation "androidx.annotation:annotation:$annotationsVersion"
     implementation "androidx.collection:collection:$collectionVersion"
+    implementation "io.grpc:grpc-okhttp:$grpcVersion"
+    implementation "io.grpc:grpc-protobuf-lite:$grpcVersion"
+    implementation "io.grpc:grpc-stub:$grpcVersion"
     compileOnly "com.google.code.findbugs:jsr305:$jsr305Version"
+    compileOnly "javax.annotation:javax.annotation-api:1.2"
     testImplementation "junit:junit:$junitVersion"
 }
 
+protobuf {
+    protoc {
+        // You still need protoc like in the non-Android case
+        artifact = "com.google.protobuf:protoc:$protocVersion"
+    }
+    plugins {
+        grpc {
+            artifact = "io.grpc:protoc-gen-grpc-java:$grpcVersion"
+        }
+    }
+    generateProtoTasks {
+        all().each { task ->
+            task.builtins {
+                java {
+                    option 'lite'
+                }
+            }
+            task.plugins {
+                grpc {
+                    option 'lite'
+                }
+            }
+        }
+    }
+}
+
 apply from: "publish.gradle"
diff --git a/tunnel/src/main/java/com/wireguard/android/backend/GoBackend.java b/tunnel/src/main/java/com/wireguard/android/backend/GoBackend.java
index 3d0886cf..b78fa9ce 100644
--- a/tunnel/src/main/java/com/wireguard/android/backend/GoBackend.java
+++ b/tunnel/src/main/java/com/wireguard/android/backend/GoBackend.java
@@ -7,11 +7,15 @@ package com.wireguard.android.backend;
 
 import android.content.Context;
 import android.content.Intent;
+import android.net.LocalSocketAddress;
 import android.os.Build;
 import android.os.ParcelFileDescriptor;
 import android.system.OsConstants;
 import android.util.Log;
 
+import com.google.protobuf.ByteString;
+import com.google.protobuf.InvalidProtocolBufferException;
+
 import com.wireguard.android.backend.BackendException.Reason;
 import com.wireguard.android.backend.Tunnel.State;
 import com.wireguard.android.util.SharedLibraryLoader;
@@ -23,6 +27,11 @@ import com.wireguard.crypto.Key;
 import com.wireguard.crypto.KeyFormatException;
 import com.wireguard.util.NonNullForAll;
 
+import io.grpc.ManagedChannel;
+import io.grpc.ManagedChannelBuilder;
+import io.grpc.okhttp.OkHttpChannelBuilder;
+
+import java.io.File;
 import java.net.InetAddress;
 import java.util.Collections;
 import java.util.Set;
@@ -32,9 +41,19 @@ import java.util.concurrent.LinkedBlockingQueue;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
 
+import javax.net.SocketFactory;
+
 import androidx.annotation.Nullable;
 import androidx.collection.ArraySet;
 
+import com.wireguard.android.backend.gen.LibwgGrpc;
+import com.wireguard.android.backend.gen.Empty;
+import com.wireguard.android.backend.gen.TunnelHandle;
+import com.wireguard.android.backend.gen.TurnOnRequest;
+import com.wireguard.android.backend.gen.TurnOnResponse;
+import com.wireguard.android.backend.gen.VersionResponse;
+
+
 /**
  * Implementation of {@link Backend} that uses the wireguard-go userspace implementation to provide
  * WireGuard tunnels.
@@ -49,6 +68,7 @@ public final class GoBackend implements Backend {
     @Nullable private Config currentConfig;
     @Nullable private Tunnel currentTunnel;
     private int currentTunnelHandle = -1;
+    private ManagedChannel channel;
 
     /**
      * Public constructor for GoBackend.
@@ -58,6 +78,24 @@ public final class GoBackend implements Backend {
     public GoBackend(final Context context) {
         SharedLibraryLoader.loadSharedLibrary(context, "wg-go");
         this.context = context;
+
+	File socketFile = new File(context.getCacheDir(), "libwg.sock");
+	String socketName = socketFile.getAbsolutePath();
+	Log.i(TAG, "wgStartGrpc: " + wgStartGrpc(socketName));
+		ManagedChannelBuilder<?> channelBuilder = ManagedChannelBuilder.forAddress("localhost", 10000).usePlaintext();
+	LocalSocketAddress address = new LocalSocketAddress(socketName, LocalSocketAddress.Namespace.FILESYSTEM);
+	SocketFactory socketFactory = new UnixDomainSocketFactory(address);
+	((OkHttpChannelBuilder) channelBuilder).socketFactory(socketFactory);
+	channel = channelBuilder.build();
+	Log.i(TAG, "wgCall: " + getVersion());
+    }
+
+    @Override
+    public String getVersion() {
+        LibwgGrpc.LibwgBlockingStub stub = LibwgGrpc.newBlockingStub(channel);
+        Empty request = Empty.newBuilder().build();
+        VersionResponse resp = stub.version(request);
+	return resp.getVersion();
     }
 
     /**
@@ -82,6 +120,8 @@ public final class GoBackend implements Backend {
 
     private static native String wgVersion();
 
+    private static native int wgStartGrpc(String sockName);
+
     /**
      * Method to get the names of running tunnels.
      *
@@ -164,10 +204,10 @@ public final class GoBackend implements Backend {
      *
      * @return {@link String} value of the version of the wireguard-go library.
      */
-    @Override
-    public String getVersion() {
-        return wgVersion();
-    }
+    //@Override
+    // public String getVersion() {
+    //     return wgVersion();
+    // }
 
     /**
      * Change the state of a given {@link Tunnel}, optionally applying a given {@link Config}.
@@ -205,6 +245,25 @@ public final class GoBackend implements Backend {
         return getState(tunnel);
     }
 
+    private int turnOn(String ifName, int tunFd, String settings, Set<InetNetwork> addresses) {
+        LibwgGrpc.LibwgBlockingStub stub = LibwgGrpc.newBlockingStub(channel);
+	TurnOnRequest.Builder builder = TurnOnRequest.newBuilder()
+	    .setInterfaceName(ifName)
+	    .setTunFd(tunFd)
+	    .setSettings(settings);
+	for (final InetNetwork addr : addresses) {
+	    com.wireguard.android.backend.gen.InetAddress inet =
+		com.wireguard.android.backend.gen.InetAddress.newBuilder()
+		.setAddress(ByteString.copyFrom(addr.getAddress().getAddress()))
+		.build();
+	    builder.addAddress(inet);
+	}
+	TurnOnRequest req = builder.build();
+	TurnOnResponse resp = stub.turnOn(req);
+	return resp.getTunnel().getHandle();
+
+    }
+
     private void setStateInternal(final Tunnel tunnel, @Nullable final Config config, final State state)
             throws Exception {
         Log.i(TAG, "Bringing tunnel " + tunnel.getName() + ' ' + state);
@@ -314,6 +373,7 @@ public final class GoBackend implements Backend {
 
             service.protect(wgGetSocketV4(currentTunnelHandle));
             service.protect(wgGetSocketV6(currentTunnelHandle));
+
         } else {
             if (currentTunnelHandle == -1) {
                 Log.w(TAG, "Tunnel already down");
diff --git a/tunnel/src/main/java/com/wireguard/android/backend/LocalSocketAdapter.java b/tunnel/src/main/java/com/wireguard/android/backend/LocalSocketAdapter.java
new file mode 100644
index 00000000..1f1d5046
--- /dev/null
+++ b/tunnel/src/main/java/com/wireguard/android/backend/LocalSocketAdapter.java
@@ -0,0 +1,325 @@
+/*
+ */
+package com.wireguard.android.backend;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.InetAddress;
+import java.net.InetSocketAddress;
+import java.net.Socket;
+import java.net.SocketAddress;
+import java.net.SocketException;
+import java.net.SocketImplFactory;
+import java.net.SocketOptions;
+import java.nio.channels.SocketChannel;
+import java.util.Vector;
+import android.net.LocalSocket;
+import android.net.LocalSocketAddress;
+import android.util.Log;
+
+/**
+ * Adaptor allows using a LocalSocket as a Socket.
+ */
+final class LocalSocketAdapter extends Socket {
+    private final LocalSocketAddress address;
+    private final LocalSocket unix;
+    private final SocketAddress localAddress;
+    private InetSocketAddress inetSocketAddress;
+    private InputStream is;
+    private OutputStream os;
+
+    LocalSocketAdapter(LocalSocketAddress address) {
+	this.address = address;
+	this.localAddress = new InetSocketAddress(0);
+	unix = new LocalSocket();
+    }
+
+    LocalSocketAdapter(LocalSocketAddress address, InetSocketAddress inetAddress) {
+	this(address);
+	this.inetSocketAddress = inetAddress;
+    }
+
+    private void throwUnsupportedOperationException() {
+	Log.i("helloworld", "Unsupported: " + Log.getStackTraceString(new Exception()));
+	throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void bind (SocketAddress bindpoint) {
+	throwUnsupportedOperationException();
+    }
+
+    @Override
+    public void close() throws IOException {
+	unix.close();
+    }
+
+    @Override public void connect(SocketAddress endpoint) throws IOException {
+	this.inetSocketAddress = (InetSocketAddress) endpoint;
+	try {
+	    unix.connect(address);
+	} catch (IOException e) {
+	    Log.i("helloworld", "Error: " + e.toString());
+	    throw e;
+	}
+    }
+
+    @Override
+    public void connect(SocketAddress endpoint, int timeout) throws IOException {
+	this.inetSocketAddress = (InetSocketAddress) endpoint;
+	unix.connect(address, timeout);
+    }
+
+    @Override
+    public SocketChannel getChannel() {
+	throwUnsupportedOperationException();
+	return null;
+    }
+
+    @Override public InetAddress getInetAddress() {
+	return inetSocketAddress.getAddress();
+    }
+
+    @Override
+    public InputStream getInputStream() throws IOException {
+	is = unix.getInputStream();
+	return is;
+    }
+
+    @Override
+    public boolean getKeepAlive() {
+	throwUnsupportedOperationException();
+	return false;
+    }
+
+    @Override
+    public InetAddress getLocalAddress() {
+	throwUnsupportedOperationException();
+	return null;
+    }
+
+    @Override
+    public int getLocalPort() {
+	throwUnsupportedOperationException();
+	return 0;
+    }
+
+    @Override
+    public SocketAddress getLocalSocketAddress() {
+	//throwUnsupportedOperationException();
+	return localAddress;
+    }
+
+    @Override
+    public boolean getOOBInline() {
+	throwUnsupportedOperationException();
+	return false;
+    }
+
+    @Override
+    public OutputStream getOutputStream() throws IOException {
+	if (os != null)
+	    return os;
+
+	OutputStream unixOs = unix.getOutputStream();
+	os = new OutputStream() {
+		@Override
+		public void close() throws IOException {
+		    // LocalSocket's default implementation closes the socket,
+		    // which leaves readers of thes InputStream hanging.
+		    // Instead shutdown input (and output) to release readers.
+		    LocalSocketAdapter.this.shutdownInput();
+		    LocalSocketAdapter.this.shutdownOutput();
+		}
+
+		@Override
+		public void write (byte[] b) throws IOException {
+		    unixOs.write(b);
+		}
+
+		@Override
+		public void write (byte[] b, int off, int len) throws IOException {
+		    unixOs.write(b, off, len);
+		}
+
+		@Override
+		public void write (int b) throws IOException {
+		    unixOs.write(b);
+		}
+	    };
+	return os;
+    }
+
+    @Override
+    public int getPort() {
+	return inetSocketAddress.getPort();
+    }
+
+    @Override
+    public int getReceiveBufferSize() throws SocketException {
+	try {
+	    return unix.getReceiveBufferSize();
+	} catch (IOException e) {
+	    throw new SocketException(e.getMessage());
+	}
+    }
+
+    @Override
+    public SocketAddress getRemoteSocketAddress() {
+	return inetSocketAddress;
+    }
+
+    @Override
+    public boolean getReuseAddress() {
+	throwUnsupportedOperationException();
+	return false;
+    }
+
+    @Override
+    public int getSendBufferSize() throws SocketException {
+	try {
+	    return unix.getSendBufferSize();
+	} catch (IOException e) {
+	    throw new SocketException(e.getMessage());
+	}
+    }
+
+    @Override
+    public int getSoLinger() {
+	throwUnsupportedOperationException();
+	return 0;
+    }
+
+    @Override
+    public int getSoTimeout() throws SocketException {
+	try {
+	    return unix.getSoTimeout();
+	} catch (IOException e) {
+	    throw new SocketException(e.getMessage());
+	}
+    }
+
+    @Override
+    public boolean getTcpNoDelay() {
+	throwUnsupportedOperationException();
+	return false;
+    }
+
+    @Override
+    public int getTrafficClass() {
+	throwUnsupportedOperationException();
+	return 0;
+    }
+
+    @Override
+    public boolean isBound() {
+	return unix.isBound();
+    }
+
+    @Override
+    public boolean isClosed() {
+	return unix.isClosed();
+    }
+
+    @Override
+    public boolean isConnected() {
+	return unix.isConnected();
+    }
+
+    @Override
+    public boolean isInputShutdown() {
+	return unix.isInputShutdown();
+    }
+
+    @Override
+    public boolean isOutputShutdown() {
+	return unix.isOutputShutdown();
+    }
+
+    @Override
+    public void sendUrgentData (int data) {
+	throwUnsupportedOperationException();
+    }
+
+    @Override
+    public void setKeepAlive (boolean on) {
+	throwUnsupportedOperationException();
+    }
+
+    @Override
+    public void setOOBInline (boolean on) {
+	throwUnsupportedOperationException();
+    }
+
+    @Override
+    public void setPerformancePreferences (int connectionTime,
+					   int latency,
+					   int bandwidth) {
+		throwUnsupportedOperationException();
+    }
+
+    @Override
+    public void setReceiveBufferSize(int size) throws SocketException {
+	try {
+	    unix.setReceiveBufferSize(size);
+	} catch (IOException e) {
+	    throw new SocketException(e.getMessage());
+	}
+    }
+
+    @Override
+    public void setReuseAddress (boolean on) {
+	throwUnsupportedOperationException();
+    }
+
+    @Override
+    public void setSendBufferSize(int size) throws SocketException {
+	try {
+	    unix.setSendBufferSize(size);
+	} catch (IOException e) {
+	    throw new SocketException(e.getMessage());
+	}
+    }
+
+    @Override
+    public void setSoLinger (boolean on,
+			     int linger) {
+	throwUnsupportedOperationException();
+    }
+
+    @Override
+    public void setSoTimeout(int timeout) throws SocketException {
+	try {
+	    unix.setSoTimeout(timeout);
+	} catch (IOException e) {
+	    throw new SocketException(e.getMessage());
+	}
+    }
+
+    @Override
+    public void setTcpNoDelay (boolean on) {
+	// Not relevant for local sockets.
+    }
+
+    @Override
+    public void setTrafficClass (int tc) {
+	throwUnsupportedOperationException();
+    }
+
+    @Override
+    public void shutdownInput() throws IOException {
+	unix.shutdownInput();
+    }
+
+    @Override
+    public void shutdownOutput() throws IOException {
+	unix.shutdownOutput();
+    }
+
+    @Override
+    public String toString() {
+	return unix.toString();
+    }
+}
diff --git a/tunnel/src/main/java/com/wireguard/android/backend/UnixDomainSocketFactory.java b/tunnel/src/main/java/com/wireguard/android/backend/UnixDomainSocketFactory.java
new file mode 100644
index 00000000..427a19f1
--- /dev/null
+++ b/tunnel/src/main/java/com/wireguard/android/backend/UnixDomainSocketFactory.java
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2018 Square, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.wireguard.android.backend;
+
+import java.io.File;
+import java.io.IOException;
+import java.net.InetAddress;
+import java.net.InetSocketAddress;
+import java.net.Socket;
+import javax.net.SocketFactory;
+import android.net.LocalSocketAddress;
+
+/** Impersonate TCP-style SocketFactory over UNIX domain sockets. */
+public final class UnixDomainSocketFactory extends SocketFactory {
+  private final LocalSocketAddress address;
+
+  public UnixDomainSocketFactory(LocalSocketAddress address) {
+    this.address = address;
+  }
+
+  @Override public Socket createSocket() throws IOException {
+    return new LocalSocketAdapter(address);
+  }
+
+  @Override public Socket createSocket(String host, int port) throws IOException {
+    Socket result = createSocket();
+    result.connect(new InetSocketAddress(host, port));
+    return result;
+  }
+
+  @Override public Socket createSocket(
+      String host, int port, InetAddress localHost, int localPort) throws IOException {
+    return createSocket(host, port);
+  }
+
+  @Override public Socket createSocket(InetAddress host, int port) throws IOException {
+    Socket result = createSocket();
+    result.connect(new InetSocketAddress(host, port));
+    return result;
+  }
+
+  @Override public Socket createSocket(
+      InetAddress host, int port, InetAddress localAddress, int localPort) throws IOException {
+    return createSocket(host, port);
+  }
+}
diff --git a/tunnel/src/main/proto/libwg.proto b/tunnel/src/main/proto/libwg.proto
new file mode 100644
index 00000000..065c663c
--- /dev/null
+++ b/tunnel/src/main/proto/libwg.proto
@@ -0,0 +1,65 @@
+syntax = "proto3";
+
+option java_multiple_files = true;
+option java_package = 'com.wireguard.android.backend.gen';
+option java_outer_classname = "LibwgProto";
+option java_generic_services = true;
+option go_package = 'golang.zx2c4.com/wireguard/android/gen';
+
+//import "google/protobuf/empty.proto";
+
+package api;
+
+service Libwg {
+	rpc StopGrpc(Empty) returns (Empty);
+	rpc TurnOn(TurnOnRequest) returns (TurnOnResponse);
+	rpc TurnOff(TurnOffRequest) returns (Empty);
+	rpc GetConfig(GetConfigRequest) returns (GetConfigResponse);
+	rpc Version(Empty) returns (VersionResponse);
+}
+
+// FIXME use google.protobuf.Empty
+message Empty {}
+
+message TunnelHandle { int32 handle = 1; }
+
+message Error {
+	enum Code {
+		UNSPECIFIED = 0;
+		INVALID_PROTOCOL_BUFFER = 1;
+		INVALID_RESPONSE = 2;
+	}
+	Code code = 1;
+	string message = 2;
+}
+
+message InetAddress {
+	bytes address = 1;
+}
+
+message TurnOnRequest {
+	string interface_name = 1;
+	int32 tun_fd = 2;
+	string settings = 3;
+	repeated InetAddress address = 4;
+}
+
+message TurnOnResponse {
+	TunnelHandle tunnel = 1;
+}
+
+message TurnOffRequest {
+	TunnelHandle tunnel = 1;
+}
+
+message GetConfigRequest {
+	TunnelHandle tunnel = 1;
+}
+
+message GetConfigResponse {
+	string config = 1;
+}
+
+message VersionResponse {
+	string version = 1;
+}
diff --git a/tunnel/tools/libwg-go/Makefile b/tunnel/tools/libwg-go/Makefile
index 1b5c60cf..32c5ae22 100644
--- a/tunnel/tools/libwg-go/Makefile
+++ b/tunnel/tools/libwg-go/Makefile
@@ -19,6 +19,7 @@ export CC := $(ANDROID_C_COMPILER)
 export GOARCH := $(NDK_GO_ARCH_MAP_$(ANDROID_ARCH_NAME))
 export GOOS := android
 export CGO_ENABLED := 1
+export GOPATH ?= $(HOME)/go
 
 GO_VERSION := 1.17.2
 GO_PLATFORM := $(shell uname -s | tr '[:upper:]' '[:lower:]')-$(NDK_GO_ARCH_MAP_$(shell uname -m))
@@ -27,6 +28,12 @@ GO_HASH_darwin-amd64 := 7914497a302a132a465d33f5ee044ce05568bacdb390ab805cb75a34
 GO_HASH_darwin-arm64 := ce8771bd3edfb5b28104084b56bbb532eeb47fbb7769c3e664c6223712c30904
 GO_HASH_linux-amd64 := f242a9db6a0ad1846de7b6d94d507915d14062660616a61ef7c808a76e4f1676
 
+PROTOC_GEN_GO := $(GOPATH)/bin/protoc-gen-go
+# FIXME autodetect protoc path
+PROTOC := /root/.gradle/caches/modules-2/files-2.1/com.google.protobuf/protoc/3.19.1/d231c807be82ffc29b02525c8c2691772eb945bc/protoc-3.19.1-linux-x86_64.exe
+PROTODIR = $(CURDIR)/../../src/main/proto
+PBDIR = $(GOPATH)/pkg/mod
+
 default: $(DESTDIR)/libwg-go.so
 
 $(GRADLE_USER_HOME)/caches/golang/$(GO_TARBALL):
@@ -45,8 +52,25 @@ $(BUILDDIR)/go-$(GO_VERSION)/.prepared: $(GRADLE_USER_HOME)/caches/golang/$(GO_T
 	patch -p1 -f -N -r- -d "$(dir $@)" < goruntime-boottime-over-monotonic.diff && \
 	touch "$@"'
 
+$(PROTOC_GEN_GO): export GOARCH :=
+$(PROTOC_GEN_GO): export GOOS :=
+$(PROTOC_GEN_GO): export PATH := $(BUILDDIR)/go-$(GO_VERSION)/bin/:$(PATH)
+$(PROTOC_GEN_GO): $(BUILDDIR)/go-$(GO_VERSION)/.prepared Makefile
+	go install google.golang.org/protobuf/cmd/protoc-gen-go@v1.26
+	go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@v1.1
+
+gen/%.pb.go: export PATH := $(GOPATH)/bin:$(PATH)
+gen/%.pb.go: $(PROTODIR)/%.proto $(BUILDDIR)/go-$(GO_VERSION)/.prepared $(PROTOC_GEN_GO)
+	test -d gen || mkdir gen
+	$(PROTOC) -I $(PROTODIR) --go_out=paths=source_relative:./gen $<
+
+gen/%_grpc.pb.go: export PATH := $(GOPATH)/bin:$(PATH)
+gen/%_grpc.pb.go: $(PROTODIR)/%.proto $(BUILDDIR)/go-$(GO_VERSION)/.prepared $(PROTOC_GEN_GO)
+	test -d gen || mkdir gen
+	$(PROTOC) -I $(PROTODIR) --go-grpc_out=./gen --go-grpc_opt=paths=source_relative $<
+
 $(DESTDIR)/libwg-go.so: export PATH := $(BUILDDIR)/go-$(GO_VERSION)/bin/:$(PATH)
-$(DESTDIR)/libwg-go.so: $(BUILDDIR)/go-$(GO_VERSION)/.prepared go.mod
+$(DESTDIR)/libwg-go.so: $(BUILDDIR)/go-$(GO_VERSION)/.prepared go.mod api-android.go service.go gen/libwg.pb.go gen/libwg_grpc.pb.go jni.c
 	go build -tags linux -ldflags="-X golang.zx2c4.com/wireguard/ipc.socketDirectory=/data/data/$(ANDROID_PACKAGE_NAME)/cache/wireguard" -v -trimpath -o "$@" -buildmode c-shared
 
 .DELETE_ON_ERROR:
diff --git a/tunnel/tools/libwg-go/api-android.go b/tunnel/tools/libwg-go/api-android.go
index 94d07c39..d0086a75 100644
--- a/tunnel/tools/libwg-go/api-android.go
+++ b/tunnel/tools/libwg-go/api-android.go
@@ -48,6 +48,7 @@ func (l AndroidLogger) Printf(format string, args ...interface{}) {
 type TunnelHandle struct {
 	device *device.Device
 	uapi   net.Listener
+	logger *device.Logger
 }
 
 var tunnelHandles map[int32]TunnelHandle
@@ -208,20 +209,38 @@ func wgGetConfig(tunnelHandle int32) *C.char {
 
 //export wgVersion
 func wgVersion() *C.char {
+	return C.CString(Version())
+}
+
+func Version() string {
 	info, ok := debug.ReadBuildInfo()
 	if !ok {
-		return C.CString("unknown")
+		return "unknown"
 	}
 	for _, dep := range info.Deps {
 		if dep.Path == "golang.zx2c4.com/wireguard" {
 			parts := strings.Split(dep.Version, "-")
 			if len(parts) == 3 && len(parts[2]) == 12 {
-				return C.CString(parts[2][:7])
+				return parts[2][:7]
 			}
-			return C.CString(dep.Version)
+			return dep.Version
 		}
 	}
-	return C.CString("unknown")
+	return "unknown"
+}
+
+//export wgStartGrpc
+func wgStartGrpc(sock_path string) C.int{
+	tag := cstring("helloworld")
+	logger := &device.Logger{
+		Verbosef: AndroidLogger{level: C.ANDROID_LOG_DEBUG, tag: tag}.Printf,
+		Errorf:   AndroidLogger{level: C.ANDROID_LOG_ERROR, tag: tag}.Printf,
+	}
+
+	res, errmsg := StartGrpc(sock_path, logger)
+
+	logger.Verbosef("wgStartGrpc: %v %v", res, errmsg)
+	return C.int(res)
 }
 
 func main() {}
diff --git a/tunnel/tools/libwg-go/go.mod b/tunnel/tools/libwg-go/go.mod
index 0883b34a..33aa796d 100644
--- a/tunnel/tools/libwg-go/go.mod
+++ b/tunnel/tools/libwg-go/go.mod
@@ -3,11 +3,18 @@ module golang.zx2c4.com/wireguard/android
 go 1.17
 
 require (
-	golang.org/x/sys v0.0.0-20211025201205-69cdffdb9359
-	golang.zx2c4.com/wireguard v0.0.0-20211028114750-eb6302c7eb71
+	golang.org/x/sys v0.0.0-20211110154304-99a53858aa08
+	golang.zx2c4.com/wireguard v0.0.0-20211111141719-cad0ff2cfbd9
+	google.golang.org/grpc v1.42.0-dev.0.20211020220737-f00baa6c3c84
+	google.golang.org/protobuf v1.27.1
 )
 
 require (
-	golang.org/x/crypto v0.0.0-20210921155107-089bfa567519 // indirect
-	golang.org/x/net v0.0.0-20211020060615-d418f374d309 // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
+	golang.org/x/crypto v0.0.0-20211108221036-ceb1ce70b4fa // indirect
+	golang.org/x/net v0.0.0-20211111083644-e5c967477495 // indirect
+	golang.org/x/text v0.3.6 // indirect
+	golang.zx2c4.com/go118/netip v0.0.0-20211111135330-a4a02eeacf9d // indirect
+	golang.zx2c4.com/wintun v0.0.0-20211104114900-415007cec224 // indirect
+	google.golang.org/genproto v0.0.0-20210722135532-667f2b7c528f // indirect
 )
diff --git a/tunnel/tools/libwg-go/go.sum b/tunnel/tools/libwg-go/go.sum
index 213ce08b..f5bc4340 100644
--- a/tunnel/tools/libwg-go/go.sum
+++ b/tunnel/tools/libwg-go/go.sum
@@ -1,17 +1,160 @@
-golang.org/x/crypto v0.0.0-20210921155107-089bfa567519 h1:7I4JAnoQBe7ZtJcBaYHi5UtiO8tQHbUSXxL+pnGRANg=
-golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
+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=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY=
+github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
+github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
+github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
+github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
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+github.com/cncf/xds/go v0.0.0-20210312221358-fbca930ec8ed/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs=
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 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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diff --git a/tunnel/tools/libwg-go/jni.c b/tunnel/tools/libwg-go/jni.c
index 7ad94d35..c89183fd 100644
--- a/tunnel/tools/libwg-go/jni.c
+++ b/tunnel/tools/libwg-go/jni.c
@@ -8,12 +8,15 @@
 #include <string.h>
 
 struct go_string { const char *str; long n; };
+struct go_slice { void *data; long len; long cap; };
+struct data { void *ptr; int len; };
 extern int wgTurnOn(struct go_string ifname, int tun_fd, struct go_string settings);
 extern void wgTurnOff(int handle);
 extern int wgGetSocketV4(int handle);
 extern int wgGetSocketV6(int handle);
 extern char *wgGetConfig(int handle);
 extern char *wgVersion();
+extern int wgStartGrpc();
 
 JNIEXPORT jint JNICALL Java_com_wireguard_android_backend_GoBackend_wgTurnOn(JNIEnv *env, jclass c, jstring ifname, jint tun_fd, jstring settings)
 {
@@ -69,3 +72,15 @@ JNIEXPORT jstring JNICALL Java_com_wireguard_android_backend_GoBackend_wgVersion
 	free(version);
 	return ret;
 }
+
+JNIEXPORT jint JNICALL Java_com_wireguard_android_backend_GoBackend_wgStartGrpc(JNIEnv *env, jclass c, jstring sockname)
+{
+	const char *sockname_str = (*env)->GetStringUTFChars(env, sockname, 0);
+	size_t sockname_len = (*env)->GetStringUTFLength(env, sockname);
+	jint res = wgStartGrpc((struct go_string){
+		.str = sockname_str,
+		.n = sockname_len
+	});
+	(*env)->ReleaseStringUTFChars(env, sockname, sockname_str);
+	return res;
+}
diff --git a/tunnel/tools/libwg-go/service.go b/tunnel/tools/libwg-go/service.go
new file mode 100644
index 00000000..904dbdcd
--- /dev/null
+++ b/tunnel/tools/libwg-go/service.go
@@ -0,0 +1,78 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"os"
+
+	"google.golang.org/grpc"
+
+	gen "golang.zx2c4.com/wireguard/android/gen"
+	"golang.zx2c4.com/wireguard/device"
+)
+
+type LibwgServiceImpl struct {
+	gen.UnimplementedLibwgServer
+	logger *device.Logger
+}
+
+var _ gen.LibwgServer = (*LibwgServiceImpl)(nil)
+var server *grpc.Server
+
+func NewLibwgService(logger *device.Logger) gen.LibwgServer {
+	return &LibwgServiceImpl{logger: logger}
+}
+
+func StartGrpc(sock_path string, logger *device.Logger) (int, string) {
+	if server != nil {
+		return -1, "Already started"
+	}
+
+	{
+		if _, err := os.Stat(sock_path); err == nil {
+			if err := os.RemoveAll(sock_path); err != nil {
+				return -1, fmt.Sprintf("Cleanup failed: %v %v", sock_path, err)
+			}
+		}
+	}
+
+	listener, err := net.Listen("unix", sock_path)
+	if err != nil {
+		return -1, fmt.Sprintf("Listen failed: %v %v", sock_path, err)
+	}
+
+	server = grpc.NewServer()
+	service := NewLibwgService(logger)
+
+	gen.RegisterLibwgServer(server, service)
+
+	go func() {
+		server.Serve(listener)
+	}()
+
+	logger.Verbosef("StartGrpc done")
+
+	return 0, ""
+}
+
+func (e *LibwgServiceImpl) Version(ctx context.Context, req *gen.Empty) (*gen.VersionResponse, error) {
+
+	r := &gen.VersionResponse{
+		Version: Version(),
+	}
+
+	return r, nil
+}
+
+func (e *LibwgServiceImpl) StopGrpc(ctx context.Context, req *gen.Empty) (*gen.Empty, error) {
+	if server != nil {
+		server.Stop()
+		server = nil
+	}
+
+	r := &gen.Empty{
+	}
+
+	return r, nil
+}