Xray-core/app/dispatcher/sniffer.go

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2020-11-25 11:01:53 +00:00
package dispatcher
import (
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"github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/protocol/bittorrent"
"github.com/xtls/xray-core/common/protocol/http"
"github.com/xtls/xray-core/common/protocol/tls"
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)
type SniffResult interface {
Protocol() string
Domain() string
}
type protocolSniffer func([]byte) (SniffResult, error)
type Sniffer struct {
sniffer []protocolSniffer
}
func NewSniffer() *Sniffer {
return &Sniffer{
sniffer: []protocolSniffer{
func(b []byte) (SniffResult, error) { return http.SniffHTTP(b) },
func(b []byte) (SniffResult, error) { return tls.SniffTLS(b) },
func(b []byte) (SniffResult, error) { return bittorrent.SniffBittorrent(b) },
},
}
}
var errUnknownContent = newError("unknown content")
func (s *Sniffer) Sniff(payload []byte) (SniffResult, error) {
var pendingSniffer []protocolSniffer
for _, s := range s.sniffer {
result, err := s(payload)
if err == common.ErrNoClue {
pendingSniffer = append(pendingSniffer, s)
continue
}
if err == nil && result != nil {
return result, nil
}
}
if len(pendingSniffer) > 0 {
s.sniffer = pendingSniffer
return nil, common.ErrNoClue
}
return nil, errUnknownContent
}