mihomo/dns/util.go
2018-12-05 21:13:29 +08:00

85 lines
1.7 KiB
Go

package dns
import (
"encoding/json"
"errors"
"time"
"github.com/Dreamacro/clash/common/cache"
"github.com/Dreamacro/clash/log"
yaml "gopkg.in/yaml.v2"
D "github.com/miekg/dns"
)
var (
// EnhancedModeMapping is a mapping for EnhancedMode enum
EnhancedModeMapping = map[string]EnhancedMode{
FAKEIP.String(): FAKEIP,
MAPPING.String(): MAPPING,
}
)
const (
FAKEIP EnhancedMode = iota
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() ([]byte, error) {
return yaml.Marshal(e.String())
}
// 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 FAKEIP:
return "fakeip"
case MAPPING:
return "redir-host"
default:
return "unknown"
}
}
func putMsgToCache(c *cache.Cache, key string, msg *D.Msg) {
if len(msg.Answer) == 0 {
log.Debugln("[DNS] answer length is zero: %#v", msg)
return
}
ttl := time.Duration(msg.Answer[0].Header().Ttl) * time.Second
c.Put(key, msg, ttl)
}