tunnel: add gRPC over unix domain socket to the go backend

With gRPC it will be easier to extend the go backend API.
In this commit the Version function is reimplemented in gRPC.

Gitignore generated protobuf files.

1 files changed, 31 insertions, 1 deletions

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 00a528f2..f10ddc52 100644
--- a/tunnel/src/main/java/com/wireguard/android/backend/GoBackend.java
+++ b/tunnel/src/main/java/com/wireguard/android/backend/GoBackend.java
@@ -7,14 +7,22 @@ package com.wireguard.android.backend;
 
 import android.content.Context;
 import android.content.Intent;
+import android.net.LocalSocketAddress;
 import android.net.ProxyInfo;
 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.google.protobuf.Empty;
+
 import com.wireguard.android.backend.BackendException.Reason;
 import com.wireguard.android.backend.Tunnel.State;
+import com.wireguard.android.backend.gen.LibwgGrpc;
+import com.wireguard.android.backend.gen.VersionRequest;
+import com.wireguard.android.backend.gen.VersionResponse;
 import com.wireguard.android.util.SharedLibraryLoader;
 import com.wireguard.config.Config;
 import com.wireguard.config.InetEndpoint;
@@ -24,6 +32,11 @@ 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.net.URL;
 import java.util.Collections;
@@ -34,6 +47,8 @@ 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;
 
@@ -51,6 +66,7 @@ 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.
@@ -60,6 +76,15 @@ 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();
     }
 
     /**
@@ -84,6 +109,8 @@ 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.
      *
@@ -168,7 +195,10 @@ public final class GoBackend implements Backend {
      */
     @Override
     public String getVersion() {
-        return wgVersion();
+        LibwgGrpc.LibwgBlockingStub stub = LibwgGrpc.newBlockingStub(channel);
+        VersionRequest request = VersionRequest.newBuilder().build();
+        VersionResponse resp = stub.version(request);
+        return resp.getVersion();
     }
 
     /**