Fix: unexpected proxy dial behavior on mapping mode

dns/util.go

@@ -2,8 +2,6 @@ package dns
 
 import (
 	"crypto/tls"
-	"encoding/json"
-	"errors"
 	"net"
 	"time"
 
@@ -13,70 +11,6 @@ import (
 	D "github.com/miekg/dns"
 )
 
-// EnhancedModeMapping is a mapping for EnhancedMode enum
-var EnhancedModeMapping = map[string]EnhancedMode{
-	NORMAL.String():  NORMAL,
-	FAKEIP.String():  FAKEIP,
-	MAPPING.String(): MAPPING,
-}
-
-const (
-	NORMAL EnhancedMode = iota
-	FAKEIP
-	MAPPING
-)
-
-type EnhancedMode int
-
-// UnmarshalYAML unserialize EnhancedMode with yaml
-func (e *EnhancedMode) UnmarshalYAML(unmarshal func(interface{}) error) error {
-	var tp string
-	if err := unmarshal(&tp); err != nil {
-		return err
-	}
-	mode, exist := EnhancedModeMapping[tp]
-	if !exist {
-		return errors.New("invalid mode")
-	}
-	*e = mode
-	return nil
-}
-
-// MarshalYAML serialize EnhancedMode with yaml
-func (e EnhancedMode) MarshalYAML() (interface{}, error) {
-	return e.String(), nil
-}
-
-// UnmarshalJSON unserialize EnhancedMode with json
-func (e *EnhancedMode) UnmarshalJSON(data []byte) error {
-	var tp string
-	json.Unmarshal(data, &tp)
-	mode, exist := EnhancedModeMapping[tp]
-	if !exist {
-		return errors.New("invalid mode")
-	}
-	*e = mode
-	return nil
-}
-
-// MarshalJSON serialize EnhancedMode with json
-func (e EnhancedMode) MarshalJSON() ([]byte, error) {
-	return json.Marshal(e.String())
-}
-
-func (e EnhancedMode) String() string {
-	switch e {
-	case NORMAL:
-		return "normal"
-	case FAKEIP:
-		return "fake-ip"
-	case MAPPING:
-		return "redir-host"
-	default:
-		return "unknown"
-	}
-}
-
 func putMsgToCache(c *cache.LruCache, key string, msg *D.Msg) {
 	var ttl uint32
 	switch {