147 lines
3 KiB
Go
147 lines
3 KiB
Go
package dns
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import (
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"crypto/tls"
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"encoding/json"
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"errors"
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"net"
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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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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() (interface{}, error) {
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return e.String(), nil
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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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switch {
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case len(msg.Answer) != 0:
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ttl = time.Duration(msg.Answer[0].Header().Ttl) * time.Second
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case len(msg.Ns) != 0:
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ttl = time.Duration(msg.Ns[0].Header().Ttl) * time.Second
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case len(msg.Extra) != 0:
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ttl = time.Duration(msg.Extra[0].Header().Ttl) * time.Second
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default:
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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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func isIPRequest(q D.Question) bool {
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if q.Qclass == D.ClassINET && (q.Qtype == D.TypeA || q.Qtype == D.TypeAAAA) {
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return true
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}
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return false
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}
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func transform(servers []NameServer, resolver *Resolver) []dnsClient {
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ret := []dnsClient{}
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for _, s := range servers {
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if s.Net == "https" {
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ret = append(ret, newDoHClient(s.Addr, resolver))
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continue
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}
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host, port, _ := net.SplitHostPort(s.Addr)
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ret = append(ret, &client{
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Client: &D.Client{
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Net: s.Net,
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TLSConfig: &tls.Config{
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ClientSessionCache: globalSessionCache,
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// alpn identifier, see https://tools.ietf.org/html/draft-hoffman-dprive-dns-tls-alpn-00#page-6
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NextProtos: []string{"dns"},
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ServerName: host,
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},
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UDPSize: 4096,
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Timeout: 5 * time.Second,
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},
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port: port,
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host: host,
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r: resolver,
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})
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}
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return ret
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}
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