tunnel: implement http proxy for Android 10+

Allow getting package names of tv apps.

1 files changed, 146 insertions, 3 deletions

diff --git a/tunnel/tools/libwg-go/service.go b/tunnel/tools/libwg-go/service.go
index 2a0dfb2d..37fb4b40 100644
--- a/tunnel/tools/libwg-go/service.go
+++ b/tunnel/tools/libwg-go/service.go
@@ -3,25 +3,45 @@ package main
 import (
 	"context"
 	"fmt"
+	"io"
 	"net"
+	"net/url"
 	"os"
 
 	"google.golang.org/grpc"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
 
 	gen "golang.zx2c4.com/wireguard/android/gen"
 	"golang.zx2c4.com/wireguard/device"
 )
 
+const (
+	IPPROTO_TCP = 6
+)
+
+type UidRequest struct {
+	Data AddrPortPair
+	RetCh chan string
+}
+
 type LibwgServiceImpl struct {
 	gen.UnimplementedLibwgServer
 	logger *device.Logger
+	httpProxy *HttpProxy
+	uidRequest chan UidRequest
+	stopReverse chan bool
 }
 
-var _ gen.LibwgServer = (*LibwgServiceImpl)(nil)
+var service *LibwgServiceImpl
 var server *grpc.Server
 
 func NewLibwgService(logger *device.Logger) gen.LibwgServer {
-	return &LibwgServiceImpl{logger: logger}
+	return &LibwgServiceImpl{
+		logger: logger,
+		uidRequest: make(chan UidRequest),
+		stopReverse: make(chan bool),
+	}
 }
 
 func StartGrpc(sock_path string, logger *device.Logger) (int, string) {
@@ -41,7 +61,7 @@ func StartGrpc(sock_path string, logger *device.Logger) (int, string) {
 	}
 
 	server = grpc.NewServer()
-	service := NewLibwgService(logger)
+	service = NewLibwgService(logger).(*LibwgServiceImpl)
 
 	gen.RegisterLibwgServer(server, service)
 
@@ -67,6 +87,7 @@ func (e *LibwgServiceImpl) StopGrpc(ctx context.Context, req *gen.StopGrpcReques
 	if server != nil {
 		server.Stop()
 		server = nil
+		service = nil
 	}
 
 	r := &gen.StopGrpcResponse{
@@ -74,3 +95,125 @@ func (e *LibwgServiceImpl) StopGrpc(ctx context.Context, req *gen.StopGrpcReques
 
 	return r, nil
 }
+
+func buildStartHttpProxyError(message string) (*gen.StartHttpProxyResponse, error) {
+	r := &gen.StartHttpProxyResponse{
+		Error: &gen.Error{
+			Message: message,
+		},
+	}
+	return r, nil
+}
+
+func (e *LibwgServiceImpl) StartHttpProxy(ctx context.Context, req *gen.StartHttpProxyRequest) (*gen.StartHttpProxyResponse, error) {
+	var listenPort uint16
+	if e.httpProxy == nil {
+		e.httpProxy = NewHttpProxy(e.uidRequest, e.logger)
+		var err error
+		listenPort, err = e.httpProxy.Start()
+
+		if err != nil {
+			e.httpProxy = nil
+			return buildStartHttpProxyError(fmt.Sprintf("Http proxy start failed: %v", err))
+		}
+	} else {
+		listenPort = e.httpProxy.GetAddrPort().Port()
+	}
+
+	pacFileUrl, err := url.Parse(req.PacFileUrl)
+	if err != nil {
+		return buildStartHttpProxyError(fmt.Sprintf("Bad pacFileUrl: %v (%s)", err, req.PacFileUrl))
+	}
+
+	err = e.httpProxy.SetPacFileUrl(pacFileUrl)
+	if err != nil {
+		return buildStartHttpProxyError(fmt.Sprintf("Bad pacFileUrl: %v (%s)", req.PacFileUrl))
+	}
+
+	r := &gen.StartHttpProxyResponse{
+		ListenPort: uint32(listenPort),
+	}
+	return r, nil
+}
+
+func (e *LibwgServiceImpl) StopHttpProxy(ctx context.Context, req *gen.StopHttpProxyRequest) (*gen.StopHttpProxyResponse, error) {
+	if e.httpProxy == nil {
+		r := &gen.StopHttpProxyResponse{
+			Error: &gen.Error{
+				Message: fmt.Sprintf("Http proxy not running"),
+			},
+		}
+		return r, nil
+	}
+
+	e.httpProxy.Stop()
+	e.httpProxy = nil
+	e.stopReverse <- true
+	r := &gen.StopHttpProxyResponse{}
+	return r, nil
+}
+
+func (e *LibwgServiceImpl) Reverse(stream gen.Libwg_ReverseServer) error {
+	e.logger.Verbosef("Reverse enter loop")
+	for e.httpProxy != nil {
+		var err error
+
+		//		err := contextError(stream.Context())
+		err = stream.Context().Err()
+		if err != nil {
+			e.logger.Verbosef("Reverse: context: %v", err)
+			return err
+		}
+
+		select {
+		case <-e.stopReverse:
+			e.logger.Verbosef("Reverse: stop")
+			break
+		case uidReq := <-e.uidRequest:
+			addrPortPair := uidReq.Data
+			local := addrPortPair.local
+			remote := addrPortPair.remote
+			r := &gen.ReverseResponse{
+				Request: &gen.ReverseResponse_Uid{
+					Uid: &gen.GetConnectionOwnerUidRequest{
+						Protocol: IPPROTO_TCP,
+						Local: &gen.InetSocketAddress{
+							Address: &gen.InetAddress{
+								Address: local.Addr().AsSlice(),
+							},
+							Port: uint32(local.Port()),
+						},
+						Remote: &gen.InetSocketAddress{
+							Address: &gen.InetAddress{
+								Address: remote.Addr().AsSlice(),
+							},
+							Port: uint32(remote.Port()),
+						},
+					},
+				},
+			}
+
+			stream.Send(r)
+
+			req, err := stream.Recv()
+			if err == io.EOF {
+				e.logger.Verbosef("no more data")
+				uidReq.RetCh <- ""
+				break
+			}
+			if err != nil {
+				err = status.Errorf(codes.Unknown, "cannot receive stream request: %v", err)
+				e.logger.Verbosef("Reverse: %v", err)
+				uidReq.RetCh <- ""
+				return err
+			}
+
+			e.logger.Verbosef("Reverse: received, wait: %v", req)
+			uidReq.RetCh <- req.GetUid().GetPackage()
+		}
+	}
+
+
+	e.logger.Verbosef("Reverse returns")
+	return nil
+}