Golang State.QType方法代碼示例

// ServeDNS implements the middleware.Handler interface.
func (d Dnssec) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
	state := middleware.State{W: w, Req: r}

	do := state.Do()
	qname := state.Name()
	qtype := state.QType()
	zone := middleware.Zones(d.zones).Matches(qname)
	if zone == "" {
		return d.Next.ServeDNS(ctx, w, r)
	}

	// Intercept queries for DNSKEY, but only if one of the zones matches the qname, otherwise we let
	// the query through.
	if qtype == dns.TypeDNSKEY {
		for _, z := range d.zones {
			if qname == z {
				resp := d.getDNSKEY(state, z, do)
				state.SizeAndDo(resp)
				w.WriteMsg(resp)
				return dns.RcodeSuccess, nil
			}
		}
	}

	drr := NewDnssecResponseWriter(w, d)
	return d.Next.ServeDNS(ctx, drr, r)
}

func (e Etcd) AAAA(zone string, state middleware.State, previousRecords []dns.RR) (records []dns.RR, debug []msg.Service, err error) {
	services, debug, err := e.records(state, false)
	if err != nil {
		return nil, debug, err
	}

	for _, serv := range services {
		ip := net.ParseIP(serv.Host)
		switch {
		case ip == nil:
			// Try to resolve as CNAME if it's not an IP, but only if we don't create loops.
			if middleware.Name(state.Name()).Matches(dns.Fqdn(serv.Host)) {
				// x CNAME x is a direct loop, don't add those
				continue
			}

			newRecord := serv.NewCNAME(state.QName(), serv.Host)
			if len(previousRecords) > 7 {
				// don't add it, and just continue
				continue
			}
			if isDuplicateCNAME(newRecord, previousRecords) {
				continue
			}

			state1 := copyState(state, serv.Host, state.QType())
			nextRecords, nextDebug, err := e.AAAA(zone, state1, append(previousRecords, newRecord))

			if err == nil {
				// Not only have we found something we should add the CNAME and the IP addresses.
				if len(nextRecords) > 0 {
					records = append(records, newRecord)
					records = append(records, nextRecords...)
					debug = append(debug, nextDebug...)
				}
				continue
			}
			// This means we can not complete the CNAME, try to look else where.
			target := newRecord.Target
			if dns.IsSubDomain(zone, target) {
				// We should already have found it
				continue
			}
			m1, e1 := e.Proxy.Lookup(state, target, state.QType())
			if e1 != nil {
				continue
			}
			// Len(m1.Answer) > 0 here is well?
			records = append(records, newRecord)
			records = append(records, m1.Answer...)
			continue
			// both here again
		case ip.To4() != nil:
			// nada?
		case ip.To4() == nil:
			records = append(records, serv.NewAAAA(state.QName(), ip.To16()))
		}
	}
	return records, debug, nil
}

func (c Chaos) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
	state := middleware.State{W: w, Req: r}
	if state.QClass() != dns.ClassCHAOS || state.QType() != dns.TypeTXT {
		return c.Next.ServeDNS(ctx, w, r)
	}

	m := new(dns.Msg)
	m.SetReply(r)

	hdr := dns.RR_Header{Name: state.QName(), Rrtype: dns.TypeTXT, Class: dns.ClassCHAOS, Ttl: 0}
	switch state.Name() {
	default:
		return c.Next.ServeDNS(ctx, w, r)
	case "authors.bind.":
		for a, _ := range c.Authors {
			m.Answer = append(m.Answer, &dns.TXT{Hdr: hdr, Txt: []string{trim(a)}})
		}
	case "version.bind.", "version.server.":
		m.Answer = []dns.RR{&dns.TXT{Hdr: hdr, Txt: []string{trim(c.Version)}}}
	case "hostname.bind.", "id.server.":
		hostname, err := os.Hostname()
		if err != nil {
			hostname = "localhost"
		}
		m.Answer = []dns.RR{&dns.TXT{Hdr: hdr, Txt: []string{trim(hostname)}}}
	}
	state.SizeAndDo(m)
	w.WriteMsg(m)
	return 0, nil
}

func (k Kubernetes) A(zone string, state middleware.State, previousRecords []dns.RR) (records []dns.RR, err error) {
	services, err := k.records(state, false)
	if err != nil {
		return nil, err
	}

	for _, serv := range services {
		ip := net.ParseIP(serv.Host)
		switch {
		case ip == nil:
			// TODO(miek): lowercasing? Should lowercase in everything see #85
			if middleware.Name(state.Name()).Matches(dns.Fqdn(serv.Host)) {
				// x CNAME x is a direct loop, don't add those
				continue
			}

			newRecord := serv.NewCNAME(state.QName(), serv.Host)
			if len(previousRecords) > 7 {
				// don't add it, and just continue
				continue
			}
			if isDuplicateCNAME(newRecord, previousRecords) {
				continue
			}

			state1 := copyState(state, serv.Host, state.QType())
			nextRecords, err := k.A(zone, state1, append(previousRecords, newRecord))

			if err == nil {
				// Not only have we found something we should add the CNAME and the IP addresses.
				if len(nextRecords) > 0 {
					records = append(records, newRecord)
					records = append(records, nextRecords...)
				}
				continue
			}
			// This means we can not complete the CNAME, try to look else where.
			target := newRecord.Target
			if dns.IsSubDomain(zone, target) {
				// We should already have found it
				continue
			}
			m1, e1 := k.Proxy.Lookup(state, target, state.QType())
			if e1 != nil {
				continue
			}
			// Len(m1.Answer) > 0 here is well?
			records = append(records, newRecord)
			records = append(records, m1.Answer...)
			continue
		case ip.To4() != nil:
			records = append(records, serv.NewA(state.QName(), ip.To4()))
		case ip.To4() == nil:
			// nodata?
		}
	}
	return records, nil
}

// Report is a plain reporting function that the server can use for REFUSED and other
// queries that are turned down because they don't match any middleware.
func Report(state middleware.State, zone, rcode string, size int, start time.Time) {
	if requestCount == nil {
		// no metrics are enabled
		return
	}

	// Proto and Family
	net := state.Proto()
	fam := "1"
	if state.Family() == 2 {
		fam = "2"
	}

	typ := state.QType()

	requestCount.WithLabelValues(zone, net, fam).Inc()
	requestDuration.WithLabelValues(zone).Observe(float64(time.Since(start) / time.Millisecond))

	if state.Do() {
		requestDo.WithLabelValues(zone).Inc()
	}

	if _, known := monitorType[typ]; known {
		requestType.WithLabelValues(zone, dns.Type(typ).String()).Inc()
	} else {
		requestType.WithLabelValues(zone, other).Inc()
	}

	if typ == dns.TypeIXFR || typ == dns.TypeAXFR {
		responseTransferSize.WithLabelValues(zone, net).Observe(float64(size))
		requestTransferSize.WithLabelValues(zone, net).Observe(float64(state.Size()))
	} else {
		responseSize.WithLabelValues(zone, net).Observe(float64(size))
		requestSize.WithLabelValues(zone, net).Observe(float64(state.Size()))
	}

	responseRcode.WithLabelValues(zone, rcode).Inc()
}

// Serve an AXFR (and fallback of IXFR) as well.
func (x Xfr) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
	state := middleware.State{W: w, Req: r}
	if !x.TransferAllowed(state) {
		return dns.RcodeServerFailure, nil
	}
	if state.QType() != dns.TypeAXFR && state.QType() != dns.TypeIXFR {
		return 0, fmt.Errorf("xfr called with non transfer type: %d", state.QType())
	}

	records := x.All()
	if len(records) == 0 {
		return dns.RcodeServerFailure, nil
	}

	ch := make(chan *dns.Envelope)
	defer close(ch)
	tr := new(dns.Transfer)
	go tr.Out(w, r, ch)

	j, l := 0, 0
	records = append(records, records[0]) // add closing SOA to the end
	log.Printf("[INFO] Outgoing transfer of %d records of zone %s to %s started", len(records), x.origin, state.IP())
	for i, r := range records {
		l += dns.Len(r)
		if l > transferLength {
			ch <- &dns.Envelope{RR: records[j:i]}
			l = 0
			j = i
		}
	}
	if j < len(records) {
		ch <- &dns.Envelope{RR: records[j:]}
	}

	w.Hijack()
	// w.Close() // Client closes connection
	return dns.RcodeSuccess, nil
}

func (f File) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
	state := middleware.State{W: w, Req: r}

	if state.QClass() != dns.ClassINET {
		return dns.RcodeServerFailure, errors.New("can only deal with ClassINET")
	}
	qname := state.Name()
	zone := middleware.Zones(f.Zones.Names).Matches(qname)
	if zone == "" {
		if f.Next != nil {
			return f.Next.ServeDNS(ctx, w, r)
		}
		return dns.RcodeServerFailure, errors.New("no next middleware found")
	}
	z, ok := f.Zones.Z[zone]
	if !ok {
		return f.Next.ServeDNS(ctx, w, r)
	}
	if z == nil {
		return dns.RcodeServerFailure, nil
	}
	if r.Opcode == dns.OpcodeNotify {
		if z.isNotify(state) {
			m := new(dns.Msg)
			m.SetReply(r)
			m.Authoritative, m.RecursionAvailable, m.Compress = true, true, true
			state.SizeAndDo(m)
			w.WriteMsg(m)

			log.Printf("[INFO] Notify from %s for %s: checking transfer", state.IP(), zone)
			ok, err := z.shouldTransfer()
			if ok {
				z.TransferIn()
			} else {
				log.Printf("[INFO] Notify from %s for %s: no serial increase seen", state.IP(), zone)
			}
			if err != nil {
				log.Printf("[WARNING] Notify from %s for %s: failed primary check: %s", state.IP(), zone, err)
			}
			return dns.RcodeSuccess, nil
		}
		log.Printf("[INFO] Dropping notify from %s for %s", state.IP(), zone)
		return dns.RcodeSuccess, nil
	}

	if z.Expired != nil && *z.Expired {
		log.Printf("[ERROR] Zone %s is expired", zone)
		return dns.RcodeServerFailure, nil
	}

	if state.QType() == dns.TypeAXFR || state.QType() == dns.TypeIXFR {
		xfr := Xfr{z}
		return xfr.ServeDNS(ctx, w, r)
	}

	answer, ns, extra, result := z.Lookup(qname, state.QType(), state.Do())

	m := new(dns.Msg)
	m.SetReply(r)
	m.Authoritative, m.RecursionAvailable, m.Compress = true, true, true
	m.Answer, m.Ns, m.Extra = answer, ns, extra

	switch result {
	case Success:
	case NoData:
	case NameError:
		m.Rcode = dns.RcodeNameError
	case Delegation:
		m.Authoritative = false
	case ServerFailure:
		return dns.RcodeServerFailure, nil
	}

	state.SizeAndDo(m)
	m, _ = state.Scrub(m)
	w.WriteMsg(m)
	return dns.RcodeSuccess, nil
}