109 lines
2.2 KiB
Go
109 lines
2.2 KiB
Go
package dns
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import (
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"encoding/json"
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"errors"
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"time"
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"github.com/Dreamacro/clash/common/cache"
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"github.com/Dreamacro/clash/log"
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yaml "gopkg.in/yaml.v2"
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D "github.com/miekg/dns"
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)
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var (
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// EnhancedModeMapping is a mapping for EnhancedMode enum
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EnhancedModeMapping = map[string]EnhancedMode{
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NORMAL.String(): NORMAL,
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FAKEIP.String(): FAKEIP,
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MAPPING.String(): MAPPING,
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}
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)
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const (
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NORMAL EnhancedMode = iota
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FAKEIP
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MAPPING
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)
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type EnhancedMode int
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// UnmarshalYAML unserialize EnhancedMode with yaml
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func (e *EnhancedMode) UnmarshalYAML(unmarshal func(interface{}) error) error {
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var tp string
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if err := unmarshal(&tp); err != nil {
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return err
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}
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mode, exist := EnhancedModeMapping[tp]
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if !exist {
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return errors.New("invalid mode")
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}
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*e = mode
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return nil
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}
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// MarshalYAML serialize EnhancedMode with yaml
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func (e EnhancedMode) MarshalYAML() ([]byte, error) {
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return yaml.Marshal(e.String())
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}
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// UnmarshalJSON unserialize EnhancedMode with json
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func (e *EnhancedMode) UnmarshalJSON(data []byte) error {
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var tp string
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json.Unmarshal(data, &tp)
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mode, exist := EnhancedModeMapping[tp]
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if !exist {
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return errors.New("invalid mode")
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}
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*e = mode
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return nil
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}
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// MarshalJSON serialize EnhancedMode with json
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func (e EnhancedMode) MarshalJSON() ([]byte, error) {
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return json.Marshal(e.String())
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}
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func (e EnhancedMode) String() string {
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switch e {
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case NORMAL:
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return "normal"
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case FAKEIP:
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return "fake-ip"
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case MAPPING:
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return "redir-host"
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default:
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return "unknown"
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}
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}
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func putMsgToCache(c *cache.Cache, key string, msg *D.Msg) {
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var ttl time.Duration
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if len(msg.Answer) != 0 {
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ttl = time.Duration(msg.Answer[0].Header().Ttl) * time.Second
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} else if len(msg.Ns) != 0 {
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ttl = time.Duration(msg.Ns[0].Header().Ttl) * time.Second
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} else if len(msg.Extra) != 0 {
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ttl = time.Duration(msg.Extra[0].Header().Ttl) * time.Second
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} else {
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log.Debugln("[DNS] response msg error: %#v", msg)
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return
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}
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c.Put(key, msg.Copy(), ttl)
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}
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func setMsgTTL(msg *D.Msg, ttl uint32) {
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for _, answer := range msg.Answer {
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answer.Header().Ttl = ttl
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}
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for _, ns := range msg.Ns {
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ns.Header().Ttl = ttl
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}
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for _, extra := range msg.Extra {
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extra.Header().Ttl = ttl
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}
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}
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