Update UoT protocol

option/udp_over_tcp.go

@@ -0,0 +1,30 @@
+package option
+
+import (
+	"github.com/sagernet/sing-box/common/json"
+	"github.com/sagernet/sing/common/uot"
+)
+
+type _UDPOverTCPOptions struct {
+	Enabled bool  `json:"enabled,omitempty"`
+	Version uint8 `json:"version,omitempty"`
+}
+
+type UDPOverTCPOptions _UDPOverTCPOptions
+
+func (o UDPOverTCPOptions) MarshalJSON() ([]byte, error) {
+	switch o.Version {
+	case 0, uot.Version:
+		return json.Marshal(o.Enabled)
+	default:
+		return json.Marshal(_UDPOverTCPOptions(o))
+	}
+}
+
+func (o *UDPOverTCPOptions) UnmarshalJSON(bytes []byte) error {
+	err := json.Unmarshal(bytes, &o.Enabled)
+	if err == nil {
+		return nil
+	}
+	return json.Unmarshal(bytes, (*_UDPOverTCPOptions)(o))
+}