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Revamp GRPC Port forwarding tunnels to use existing proxy
Signed-off-by: Balaji Vijayakumar <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,69 +1,84 @@ | ||
| package portfwdserver | ||
|
|
||
| import ( | ||
| "context" | ||
| "errors" | ||
| "io" | ||
| "net" | ||
| "time" | ||
|
|
||
| "github.com/containers/gvisor-tap-vsock/pkg/tcpproxy" | ||
| "github.com/lima-vm/lima/pkg/guestagent/api" | ||
| ) | ||
|
|
||
| type TunnelServer struct { | ||
| Conns map[string]net.Conn | ||
| } | ||
| type TunnelServer struct{} | ||
|
|
||
| func NewTunnelServer() *TunnelServer { | ||
| return &TunnelServer{ | ||
| Conns: make(map[string]net.Conn), | ||
| } | ||
| return &TunnelServer{} | ||
| } | ||
|
|
||
| func (s *TunnelServer) Start(stream api.GuestService_TunnelServer) error { | ||
| for { | ||
| in, err := stream.Recv() | ||
| // Receive the handshake message to start tunnel | ||
| in, err := stream.Recv() | ||
| if err != nil { | ||
| if errors.Is(err, io.EOF) { | ||
| return nil | ||
| } | ||
| if err != nil { | ||
| return err | ||
| } | ||
| if len(in.Data) == 0 { | ||
| continue | ||
| } | ||
| return err | ||
| } | ||
|
|
||
| conn, ok := s.Conns[in.Id] | ||
| if !ok { | ||
| conn, err = net.Dial(in.Protocol, in.GuestAddr) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| s.Conns[in.Id] = conn | ||
|
|
||
| writer := &GRPCServerWriter{id: in.Id, udpAddr: in.UdpTargetAddr, stream: stream} | ||
| go func() { | ||
| _, _ = io.Copy(writer, conn) | ||
| delete(s.Conns, writer.id) | ||
| }() | ||
| } | ||
| _, err = conn.Write(in.Data) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| // We simply forward data form GRPC stream to net.Conn for both tcp and udp. So simple tcpproxy is sufficient | ||
| rw := &GRPCServerRW{stream: stream, id: in.Id} | ||
| remote := tcpproxy.DialProxy{ | ||
| DialContext: func(_ context.Context, _, _ string) (net.Conn, error) { | ||
| return net.Dial(in.Protocol, in.GuestAddr) | ||
| }, | ||
| } | ||
| remote.HandleConn(rw) | ||
| return nil | ||
| } | ||
|
|
||
| type GRPCServerWriter struct { | ||
| id string | ||
| udpAddr string | ||
| stream api.GuestService_TunnelServer | ||
| type GRPCServerRW struct { | ||
| id string | ||
| stream api.GuestService_TunnelServer | ||
| } | ||
|
|
||
| var _ io.Writer = (*GRPCServerWriter)(nil) | ||
| var _ net.Conn = (*GRPCServerRW)(nil) | ||
|
|
||
| func (g GRPCServerWriter) Write(p []byte) (n int, err error) { | ||
| if len(p) == 0 { | ||
| return 0, nil | ||
| } | ||
| err = g.stream.Send(&api.TunnelMessage{Id: g.id, Data: p, UdpTargetAddr: g.udpAddr}) | ||
| func (g GRPCServerRW) Write(p []byte) (n int, err error) { | ||
| err = g.stream.Send(&api.TunnelMessage{Id: g.id, Data: p}) | ||
| return len(p), err | ||
| } | ||
|
|
||
| func (g GRPCServerRW) Read(p []byte) (n int, err error) { | ||
| in, err := g.stream.Recv() | ||
| if err != nil { | ||
| return 0, err | ||
| } | ||
| copy(p, in.Data) | ||
| return len(in.Data), nil | ||
| } | ||
|
|
||
| func (g GRPCServerRW) Close() error { | ||
| return nil | ||
| } | ||
|
|
||
| func (g GRPCServerRW) LocalAddr() net.Addr { | ||
| return &net.UnixAddr{Name: "grpc", Net: "unixpacket"} | ||
| } | ||
|
|
||
| func (g GRPCServerRW) RemoteAddr() net.Addr { | ||
| return &net.UnixAddr{Name: "grpc", Net: "unixpacket"} | ||
| } | ||
|
|
||
| func (g GRPCServerRW) SetDeadline(_ time.Time) error { | ||
| return nil | ||
| } | ||
|
|
||
| func (g GRPCServerRW) SetReadDeadline(_ time.Time) error { | ||
| return nil | ||
| } | ||
|
|
||
| func (g GRPCServerRW) SetWriteDeadline(_ time.Time) error { | ||
| return nil | ||
| } |