package sniffer import ( "errors" "net" CN "github.com/Dreamacro/clash/common/net" "github.com/Dreamacro/clash/component/resolver" C "github.com/Dreamacro/clash/constant" "github.com/Dreamacro/clash/log" ) var ( ErrorUnsupportedSniffer = errors.New("unsupported sniffer") ) var Dispatcher SnifferDispatcher type SnifferDispatcher struct { enable bool force bool sniffers []C.Sniffer } func (sd *SnifferDispatcher) Tcp(conn net.Conn, metadata *C.Metadata) { bufConn, ok := conn.(*CN.BufferedConn) if !ok { return } if sd.force { sd.cover(bufConn, metadata) } else { if metadata.Host != "" { return } sd.cover(bufConn, metadata) } } func (sd *SnifferDispatcher) Enable() bool { return sd.enable } func (sd *SnifferDispatcher) cover(conn *CN.BufferedConn, metadata *C.Metadata) { for _, sniffer := range sd.sniffers { if sniffer.SupportNetwork() == C.TCP { _, err := conn.Peek(1) if err != nil { return } bufferedLen := conn.Buffered() bytes, err := conn.Peek(bufferedLen) if err != nil { log.Debugln("[Sniffer] the data lenght not enough") continue } host, err := sniffer.SniffTCP(bytes) if err != nil { log.Debugln("[Sniffer][%s] Sniff data failed %s", sniffer.Protocol(), metadata.DstIP) continue } metadata.Host = host metadata.AddrType = C.AtypDomainName log.Debugln("[Sniffer][%s] %s --> %s", sniffer.Protocol(), metadata.DstIP, metadata.Host) if resolver.FakeIPEnabled() { metadata.DNSMode = C.DNSFakeIP } else { metadata.DNSMode = C.DNSMapping } resolver.InsertHostByIP(metadata.DstIP, host) metadata.DstIP = nil break } } } func NewSnifferDispatcher(needSniffer []C.SnifferType, force bool) (SnifferDispatcher, error) { dispatcher := SnifferDispatcher{ enable: true, force: force, } for _, snifferName := range needSniffer { sniffer, err := NewSniffer(snifferName) if err != nil { log.Errorln("Sniffer name[%s] is error", snifferName) return SnifferDispatcher{enable: false}, err } dispatcher.sniffers = append(dispatcher.sniffers, sniffer) } return dispatcher, nil } func NewSniffer(name C.SnifferType) (C.Sniffer, error) { switch name { case C.TLS: return &TLSSniffer{}, nil default: return nil, ErrorUnsupportedSniffer } }