Add call protocol, Rmux. Update AmneziaWG. Fixes and improvements

transport/call/wbstream/dc_packet.go

@@ -0,0 +1,53 @@
+package wbstream
+
+import (
+	"github.com/pion/datachannel"
+	"github.com/sagernet/sing-box/transport/call/livekit"
+)
+
+type dataPacketWrapper struct {
+	inner datachannel.ReadWriteCloser
+	kind  int
+}
+
+func (w *dataPacketWrapper) ReadDataChannel(p []byte) (int, bool, error) {
+	buf := make([]byte, len(p))
+	for {
+		n, isString, err := w.inner.ReadDataChannel(buf)
+		if err != nil {
+			return 0, false, err
+		}
+		if n == 0 {
+			continue
+		}
+		payload, ok := livekit.DecodeDataPacketUser(buf[:n])
+		if !ok || len(payload) == 0 {
+			continue
+		}
+		copied := copy(p, payload)
+		return copied, isString, nil
+	}
+}
+
+func (w *dataPacketWrapper) WriteDataChannel(p []byte, isString bool) (int, error) {
+	wire := livekit.EncodeDataPacketUser(p, w.kind)
+	if _, err := w.inner.WriteDataChannel(wire, isString); err != nil {
+		return 0, err
+	}
+	return len(p), nil
+}
+
+func (w *dataPacketWrapper) Read(p []byte) (int, error) {
+	n, _, err := w.ReadDataChannel(p)
+	return n, err
+}
+
+func (w *dataPacketWrapper) Write(p []byte) (int, error) {
+	return w.WriteDataChannel(p, false)
+}
+
+func (w *dataPacketWrapper) Close() error { return w.inner.Close() }
+
+func newDataPacketWrapper(inner datachannel.ReadWriteCloser, kind int) *dataPacketWrapper {
+	return &dataPacketWrapper{inner: inner, kind: kind}
+}