6 files changed, 54 insertions, 0 deletions
diff --git a/tunnel/src/main/java/com/wireguard/android/backend/Backend.java b/tunnel/src/main/java/com/wireguard/android/backend/Backend.java
index 5aaad826..b6f7ab89 100644
--- a/tunnel/src/main/java/com/wireguard/android/backend/Backend.java
+++ b/tunnel/src/main/java/com/wireguard/android/backend/Backend.java
@@ -64,4 +64,6 @@ public interface Backend {
      * @throws Exception Exception raised while changing state.
      */
     Tunnel.State setState(Tunnel tunnel, Tunnel.State state, @Nullable Config config) throws Exception;
+
+    void setRunningTunnelConfig(Tunnel tunnel, Config config);
 }
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 c8158a72..59397a03 100644
--- a/tunnel/src/main/java/com/wireguard/android/backend/GoBackend.java
+++ b/tunnel/src/main/java/com/wireguard/android/backend/GoBackend.java
@@ -28,10 +28,13 @@ import com.wireguard.android.backend.gen.GetConnectionOwnerUidResponse;
 import com.wireguard.android.backend.gen.LibwgGrpc;
 import com.wireguard.android.backend.gen.ReverseRequest;
 import com.wireguard.android.backend.gen.ReverseResponse;
+import com.wireguard.android.backend.gen.SetConfigRequest;
+import com.wireguard.android.backend.gen.SetConfigResponse;
 import com.wireguard.android.backend.gen.StartHttpProxyRequest;
 import com.wireguard.android.backend.gen.StartHttpProxyResponse;
 import com.wireguard.android.backend.gen.StopHttpProxyRequest;
 import com.wireguard.android.backend.gen.StopHttpProxyResponse;
+import com.wireguard.android.backend.gen.TunnelHandle;
 import com.wireguard.android.backend.gen.VersionRequest;
 import com.wireguard.android.backend.gen.VersionResponse;
 import com.wireguard.android.util.SharedLibraryLoader;
@@ -262,6 +265,18 @@ public final class GoBackend implements Backend {
         return getState(tunnel);
     }
 
+    @Override
+    public void setRunningTunnelConfig(final Tunnel tunnel, final Config config) {
+        LibwgGrpc.LibwgStub asyncStub = LibwgGrpc.newStub(channel);
+        LibwgGrpc.LibwgBlockingStub stub = LibwgGrpc.newBlockingStub(channel);
+        final String goConfig = config.toWgUserspaceString();
+        SetConfigRequest.Builder reqBuilder = SetConfigRequest.newBuilder();
+        TunnelHandle.Builder tunnelBuilder = TunnelHandle.newBuilder();
+        tunnelBuilder.setHandle(currentTunnelHandle);
+        SetConfigRequest req = reqBuilder.setTunnel(tunnelBuilder.build()).setSettings(goConfig).build();
+        SetConfigResponse resp = stub.setConfig(req);
+    }
+
     private int startHttpProxy(Uri pacFileUrl) {
         LibwgGrpc.LibwgStub asyncStub = LibwgGrpc.newStub(channel);
         LibwgGrpc.LibwgBlockingStub stub = LibwgGrpc.newBlockingStub(channel);
diff --git a/tunnel/src/main/java/com/wireguard/android/backend/WgQuickBackend.java b/tunnel/src/main/java/com/wireguard/android/backend/WgQuickBackend.java
index 3121c996..8df89682 100644
--- a/tunnel/src/main/java/com/wireguard/android/backend/WgQuickBackend.java
+++ b/tunnel/src/main/java/com/wireguard/android/backend/WgQuickBackend.java
@@ -166,6 +166,10 @@ public final class WgQuickBackend implements Backend {
         return state;
     }
 
+    @Override
+    public void setRunningTunnelConfig(final Tunnel tunnel, final Config config) {
+    }
+
     private void setStateInternal(final Tunnel tunnel, @Nullable final Config config, final State state) throws Exception {
         Log.i(TAG, "Bringing tunnel " + tunnel.getName() + ' ' + state);
 
diff --git a/tunnel/src/main/proto/libwg.proto b/tunnel/src/main/proto/libwg.proto
index b25a10cd..4d060b7b 100644
--- a/tunnel/src/main/proto/libwg.proto
+++ b/tunnel/src/main/proto/libwg.proto
@@ -11,6 +11,7 @@ package api;
 service Libwg {
 	rpc StopGrpc(StopGrpcRequest) returns (StopGrpcResponse);
 	rpc Version(VersionRequest) returns (VersionResponse);
+	rpc SetConfig(SetConfigRequest) returns (SetConfigResponse);
 	rpc StartHttpProxy(StartHttpProxyRequest) returns (StartHttpProxyResponse);
 	rpc StopHttpProxy(StopHttpProxyRequest) returns (StopHttpProxyResponse);
 	rpc Reverse(stream ReverseRequest) returns (stream ReverseResponse);
@@ -50,6 +51,15 @@ message VersionResponse {
 	string version = 1;
 }
 
+message SetConfigRequest {
+	TunnelHandle tunnel = 1;
+	string settings = 2;
+}
+
+message SetConfigResponse {
+	Error error = 1;
+}
+
 message StartHttpProxyRequest {
 	string pacFileUrl = 1;
 }
diff --git a/tunnel/tools/libwg-go/service.go b/tunnel/tools/libwg-go/service.go
index 37fb4b40..6563772b 100644
--- a/tunnel/tools/libwg-go/service.go
+++ b/tunnel/tools/libwg-go/service.go
@@ -83,6 +83,29 @@ func (e *LibwgServiceImpl) Version(ctx context.Context, req *gen.VersionRequest)
 	return r, nil
 }
 
+func (e *LibwgServiceImpl) SetConfig(ctx context.Context, req *gen.SetConfigRequest) (*gen.SetConfigResponse, error) {
+	handle, ok := tunnelHandles[req.Tunnel.Handle]
+	if !ok {
+		r := &gen.SetConfigResponse{
+		}
+		return r, nil
+	}
+	err := handle.device.IpcSet(req.Settings)
+
+	if err != nil {
+		r := &gen.SetConfigResponse{
+			Error: &gen.Error{
+				Message: fmt.Sprintln(err),
+			},
+		}
+		return r, nil
+	}
+
+	r := &gen.SetConfigResponse{
+	}
+	return r, nil
+}
+
 func (e *LibwgServiceImpl) StopGrpc(ctx context.Context, req *gen.StopGrpcRequest) (*gen.StopGrpcResponse, error) {
 	if server != nil {
 		server.Stop()
diff --git a/tunnel/tools/wireguard-tools b/tunnel/tools/wireguard-tools
-Subproject c0b68d2eafaf2b44df9377ba0844bc315163247
+Subproject 3ba6527130c502144e7388b900138bca6260f4e