Golang dns.RR_Header类代码示例

func dnsAppend(q dns.Question, m *dns.Msg, rr dns.RR) {
	hdr := dns.RR_Header{Name: q.Name, Class: q.Qclass, Ttl: 0}

	if rrS, ok := rr.(*dns.A); ok {
		hdr.Rrtype = dns.TypeA
		rrS.Hdr = hdr
	} else if rrS, ok := rr.(*dns.AAAA); ok {
		hdr.Rrtype = dns.TypeAAAA
		rrS.Hdr = hdr
	} else if rrS, ok := rr.(*dns.CNAME); ok {
		hdr.Rrtype = dns.TypeCNAME
		rrS.Hdr = hdr
	} else if rrS, ok := rr.(*dns.TXT); ok {
		hdr.Rrtype = dns.TypeTXT
		rrS.Hdr = hdr
	} else {
		log.Printf("error: unknown dnsAppend RR type: %+v\n", rr)
		return
	}

	if q.Qtype == dns.TypeANY || q.Qtype == rr.Header().Rrtype {
		m.Answer = append(m.Answer, rr)
	} else {
		m.Extra = append(m.Extra, rr)
	}
}

func statusRR(z *Zone) []dns.RR {
	h := dns.RR_Header{Ttl: 1, Class: dns.ClassINET, Rrtype: dns.TypeTXT}
	h.Name = "_status." + z.Origin + "."

	status := map[string]string{"v": VERSION, "id": serverId}

	hostname, err := os.Hostname()
	if err == nil {
		status["h"] = hostname
	}
	status["up"] = strconv.Itoa(int(time.Since(timeStarted).Seconds()))
	status["qs"] = strconv.FormatUint(qCounter, 10)

	js, err := json.Marshal(status)

	return []dns.RR{&dns.RR_TXT{Hdr: h, Txt: []string{string(js)}}}
}

func (s *Service) answer(q dns.Question) (answers []dns.RR) {
	name := strings.TrimSuffix(q.Name, s.Config.Domain)
	if name != "" && strings.HasSuffix(name, ".") {
		name = name[0 : len(name)-1]
	}
	instances := s.AWSService.GetEC2FromName(name)
	for _, inst := range instances {
		var target string
		ttl := s.Config.Ttl
		hdr := dns.RR_Header{
			Name:   q.Name,
			Class:  dns.ClassINET,
			Rrtype: q.Qtype,
			Ttl:    ttl,
		}
		if inst.PubicDNS != "" {
			hdr.Rrtype = dns.TypeCNAME
			target = inst.PubicDNS
			if !strings.HasSuffix(target, ".") {
				target += "."
			}
		} else if q.Qtype == dns.TypeA {
			target = inst.PublicIP
			if target == "" {
				target = inst.PrivateIP
			}
		}
		if target == "" {
			continue
		}
		if hdr.Rrtype == dns.TypeCNAME {
			answers = append(answers, &dns.CNAME{
				Hdr:    hdr,
				Target: target,
			})
		} else if hdr.Rrtype == dns.TypeA {
			answers = append(answers, &dns.A{
				Hdr: hdr,
				A:   net.ParseIP(target),
			})
		}
	}
	return answers
}

func statusRR(label string) []dns.RR {
	h := dns.RR_Header{Ttl: 1, Class: dns.ClassINET, Rrtype: dns.TypeTXT}
	h.Name = label

	status := map[string]string{"v": VERSION, "id": serverID}

	hostname, err := os.Hostname()
	if err == nil {
		status["h"] = hostname
	}

	qCounter := metrics.Get("queries").(metrics.Meter)
	status["up"] = strconv.Itoa(int(time.Since(timeStarted).Seconds()))
	status["qs"] = strconv.FormatInt(qCounter.Count(), 10)
	status["qps1"] = fmt.Sprintf("%.4f", qCounter.Rate1())

	js, err := json.Marshal(status)

	return []dns.RR{&dns.TXT{Hdr: h, Txt: []string{string(js)}}}
}

// Resolve wraps Unbound's ub_resolve.
func (u *Unbound) Resolve(name string, rrtype, rrclass uint16) (*Result, error) {
	res := C.new_ub_result()
	r := new(Result)
	defer C.ub_resolve_free(res)
	i := C.ub_resolve(u.ctx, C.CString(name), C.int(rrtype), C.int(rrclass), &res)
	err := newError(int(i))
	if err != nil {
		return nil, err
	}

	r.Qname = C.GoString(res.qname)
	r.Qtype = uint16(res.qtype)
	r.Qclass = uint16(res.qclass)

	r.CanonName = C.GoString(res.canonname)
	r.Rcode = int(res.rcode)
	r.AnswerPacket = new(dns.Msg)
	r.AnswerPacket.Unpack(C.GoBytes(res.answer_packet, res.answer_len)) // Should always work
	r.HaveData = res.havedata == 1
	r.NxDomain = res.nxdomain == 1
	r.Secure = res.secure == 1
	r.Bogus = res.bogus == 1
	r.WhyBogus = C.GoString(res.why_bogus)

	// Re-create the RRs
	var h dns.RR_Header
	h.Name = r.Qname
	h.Rrtype = r.Qtype
	h.Class = r.Qclass
	h.Ttl = 0

	r.Data = make([][]byte, 0)
	r.Rr = make([]dns.RR, 0)
	j := 0
	if r.HaveData {
		b := C.GoBytes(unsafe.Pointer(C.array_elem_char(res.data, C.int(j))), C.array_elem_int(res.len, C.int(j)))
		for len(b) != 0 {
			// Create the RR
			h.Rdlength = uint16(len(b))
			msg := make([]byte, 20+len(h.Name)) // Long enough
			off, _ := dns.PackStruct(&h, msg, 0)
			msg = msg[:off]
			rrbuf := append(msg, b...)
			rr, _, err := dns.UnpackRR(rrbuf, 0)
			if err == nil {
				r.Rr = append(r.Rr, rr)
			}

			r.Data = append(r.Data, b)
			j++
			b = C.GoBytes(unsafe.Pointer(C.array_elem_char(res.data, C.int(j))), C.array_elem_int(res.len, C.int(j)))

		}
	}
	return r, err
}

//.........这里部分代码省略.........
				netmask = 16
			}
			edns.SourceScope = uint8(netmask)
			m.Extra = append(m.Extra, opt_rr)
		}
	}

	labels, labelQtype := z.findLabels(label, targets, qTypes{dns.TypeMF, dns.TypeCNAME, qtype})
	if labelQtype == 0 {
		labelQtype = qtype
	}

	if labels == nil {

		permitDebug := !*flagPrivateDebug || (realIP != nil && realIP.IsLoopback())

		firstLabel := (strings.Split(label, "."))[0]

		if qle != nil {
			qle.LabelName = firstLabel
		}

		if permitDebug && firstLabel == "_status" {
			if qtype == dns.TypeANY || qtype == dns.TypeTXT {
				m.Answer = statusRR(label + "." + z.Origin + ".")
			} else {
				m.Ns = append(m.Ns, z.SoaRR())
			}
			m.Authoritative = true
			w.WriteMsg(m)
			return
		}

		if firstLabel == "_country" {
			if qtype == dns.TypeANY || qtype == dns.TypeTXT {
				h := dns.RR_Header{Ttl: 1, Class: dns.ClassINET, Rrtype: dns.TypeTXT}
				h.Name = label + "." + z.Origin + "."

				txt := []string{
					w.RemoteAddr().String(),
					ip.String(),
				}

				targets, netmask := z.Options.Targeting.GetTargets(ip)
				txt = append(txt, strings.Join(targets, " "))
				txt = append(txt, fmt.Sprintf("/%d", netmask), serverID, serverIP)

				m.Answer = []dns.RR{&dns.TXT{Hdr: h,
					Txt: txt,
				}}
			} else {
				m.Ns = append(m.Ns, z.SoaRR())
			}

			m.Authoritative = true

			w.WriteMsg(m)
			return
		}

		// return NXDOMAIN
		m.SetRcode(req, dns.RcodeNameError)
		m.Authoritative = true

		m.Ns = []dns.RR{z.SoaRR()}

		w.WriteMsg(m)
		return
	}

	if servers := labels.Picker(labelQtype, labels.MaxHosts); servers != nil {
		var rrs []dns.RR
		for _, record := range servers {
			rr := dns.Copy(record.RR)
			rr.Header().Name = qname
			rrs = append(rrs, rr)
		}
		m.Answer = rrs
	}

	if len(m.Answer) == 0 {
		// Return a SOA so the NOERROR answer gets cached
		m.Ns = append(m.Ns, z.SoaRR())
	}

	logPrintln(m)

	if qle != nil {
		qle.LabelName = labels.Label
		qle.Answers = len(m.Answer)
		qle.Rcode = m.Rcode
	}
	err := w.WriteMsg(m)
	if err != nil {
		// if Pack'ing fails the Write fails. Return SERVFAIL.
		log.Println("Error writing packet", m)
		dns.HandleFailed(w, req)
	}
	return
}

func setupZoneData(data map[string]interface{}, Zone *Zone) {

	recordTypes := map[string]uint16{
		"a":     dns.TypeA,
		"aaaa":  dns.TypeAAAA,
		"ns":    dns.TypeNS,
		"cname": dns.TypeCNAME,
		"alias": dns.TypeMF,
	}

	for dk, dv_inter := range data {

		dv := dv_inter.(map[string]interface{})

		//log.Printf("K %s V %s TYPE-V %T\n", dk, dv, dv)

		dk = strings.ToLower(dk)
		Zone.Labels[dk] = new(Label)
		label := Zone.Labels[dk]
		label.Label = dk
		label.Ttl = Zone.Options.Ttl
		label.MaxHosts = Zone.Options.MaxHosts

		if ttl, ok := dv["ttl"]; ok {
			label.Ttl = valueToInt(ttl)
		}

		if maxHosts, ok := dv["max_hosts"]; ok {
			label.MaxHosts = valueToInt(maxHosts)
		}

		for rType, dnsType := range recordTypes {

			rdata := dv[rType]

			if rdata == nil {
				//log.Printf("No %s records for label %s\n", rType, dk)
				continue
			}

			//log.Printf("rdata %s TYPE-R %T\n", rdata, rdata)

			records := make(map[string][]interface{})

			switch rdata.(type) {
			case map[string]interface{}:
				// Handle NS map syntax, map[ns2.example.net:<nil> ns1.example.net:<nil>]
				tmp := make([]interface{}, 0)
				for rdata_k, rdata_v := range rdata.(map[string]interface{}) {
					if rdata_v == nil {
						rdata_v = ""
					}
					tmp = append(tmp, []string{rdata_k, rdata_v.(string)})
				}
				records[rType] = tmp
			case string:
				// CNAME and alias
				tmp := make([]interface{}, 1)
				tmp[0] = rdata.(string)
				records[rType] = tmp
			default:
				records[rType] = rdata.([]interface{})
			}

			//log.Printf("RECORDS %s TYPE-REC %T\n", Records, Records)

			if label.Records == nil {
				label.Records = make(map[uint16]Records)
				label.Weight = make(map[uint16]int)
			}

			label.Records[dnsType] = make(Records, len(records[rType]))

			for i := 0; i < len(records[rType]); i++ {

				//log.Printf("RT %T %#v\n", records[rType][i], records[rType][i])

				record := new(Record)

				var h dns.RR_Header
				// log.Println("TTL OPTIONS", Zone.Options.Ttl)
				h.Ttl = uint32(label.Ttl)
				h.Class = dns.ClassINET
				h.Rrtype = dnsType
				h.Name = label.Label + "." + Zone.Origin + "."

				switch dnsType {
				case dns.TypeA, dns.TypeAAAA:
					rec := records[rType][i].([]interface{})
					ip := rec[0].(string)
					var err error
					switch rec[1].(type) {
					case string:
						record.Weight, err = strconv.Atoi(rec[1].(string))
						if err != nil {
							panic("Error converting weight to integer")
						}
						label.Weight[dnsType] += record.Weight
					case float64:
						record.Weight = int(rec[1].(float64))
//.........这里部分代码省略.........

func setupZoneData(data map[string]interface{}, Zone *Zone) {
	recordTypes := map[string]uint16{
		"a":     dns.TypeA,
		"aaaa":  dns.TypeAAAA,
		"alias": dns.TypeMF,
		"cname": dns.TypeCNAME,
		"mx":    dns.TypeMX,
		"ns":    dns.TypeNS,
		"txt":   dns.TypeTXT,
		"spf":   dns.TypeSPF,
		"srv":   dns.TypeSRV,
		"ptr":   dns.TypePTR,
	}

	for dk, dv_inter := range data {
		dv := dv_inter.(map[string]interface{})

		//log.Printf("K %s V %s TYPE-V %T\n", dk, dv, dv)

		label := Zone.AddLabel(dk)

		for rType, rdata := range dv {
			switch rType {
			case "max_hosts":
				label.MaxHosts = valueToInt(rdata)
				continue
			case "ttl":
				label.Ttl = valueToInt(rdata)
				continue
			}

			dnsType, ok := recordTypes[rType]
			if !ok {
				log.Printf("Unsupported record type '%s'\n", rType)
				continue
			}

			if rdata == nil {
				//log.Printf("No %s records for label %s\n", rType, dk)
				continue
			}

			//log.Printf("rdata %s TYPE-R %T\n", rdata, rdata)

			records := make(map[string][]interface{})

			switch rdata.(type) {
			case map[string]interface{}:
				// Handle NS map syntax, map[ns2.example.net:<nil> ns1.example.net:<nil>]
				tmp := make([]interface{}, 0)
				for rdataK, rdataV := range rdata.(map[string]interface{}) {
					if rdataV == nil {
						rdataV = ""
					}
					tmp = append(tmp, []string{rdataK, rdataV.(string)})
				}
				records[rType] = tmp
			case string:
				// CNAME and alias
				tmp := make([]interface{}, 1)
				tmp[0] = rdata.(string)
				records[rType] = tmp
			default:
				records[rType] = rdata.([]interface{})
			}

			//log.Printf("RECORDS %s TYPE-REC %T\n", Records, Records)

			label.Records[dnsType] = make(Records, len(records[rType]))

			for i := 0; i < len(records[rType]); i++ {
				//log.Printf("RT %T %#v\n", records[rType][i], records[rType][i])

				record := new(Record)

				var h dns.RR_Header
				h.Class = dns.ClassINET
				h.Rrtype = dnsType

				// We add the TTL as a last pass because we might not have
				// processed it yet when we process the record data.

				switch len(label.Label) {
				case 0:
					h.Name = Zone.Origin + "."
				default:
					h.Name = label.Label + "." + Zone.Origin + "."
				}

				switch dnsType {
				case dns.TypeA, dns.TypeAAAA, dns.TypePTR:

					str, weight := getStringWeight(records[rType][i].([]interface{}))
					ip := str
					record.Weight = weight

					switch dnsType {
					case dns.TypePTR:
						record.RR = &dns.PTR{Hdr: h, Ptr: ip}
						break
//.........这里部分代码省略.........

func serve(w dns.ResponseWriter, req *dns.Msg, z *Zone) {

	qtype := req.Question[0].Qtype

	logPrintf("[zone %s] incoming %s %s %d from %s\n", z.Origin, req.Question[0].Name,
		dns.Rr_str[qtype], req.MsgHdr.Id, w.RemoteAddr())

	// is this safe/atomic or does it need to go through a channel?
	qCounter++

	logPrintln("Got request", req)

	label := getQuestionName(z, req)

	var country string
	if geoIP != nil {
		ip, _, _ := net.SplitHostPort(w.RemoteAddr().String())
		country = strings.ToLower(geoIP.GetCountry(ip))
		logPrintln("Country:", ip, country)
	}

	m := new(dns.Msg)
	m.SetReply(req)
	if e := m.IsEdns0(); e != nil {
		m.SetEdns0(4096, e.Do())
	}
	m.Authoritative = true

	// TODO(ask) Fix the findLabels API to make this work better
	if alias := z.findLabels(label, "", dns.TypeMF); alias != nil &&
		alias.Records[dns.TypeMF] != nil {
		// We found an alias record, so pretend the question was for that name instead
		label = alias.firstRR(dns.TypeMF).(*dns.RR_MF).Mf
	}

	labels := z.findLabels(label, country, qtype)
	if labels == nil {

		if label == "_status" && (qtype == dns.TypeANY || qtype == dns.TypeTXT) {
			m.Answer = statusRR(z)
			m.Authoritative = true
			w.Write(m)
			return
		}

		if label == "_country" && (qtype == dns.TypeANY || qtype == dns.TypeTXT) {
			h := dns.RR_Header{Ttl: 1, Class: dns.ClassINET, Rrtype: dns.TypeTXT}
			h.Name = "_country." + z.Origin + "."

			m.Answer = []dns.RR{&dns.RR_TXT{Hdr: h,
				Txt: []string{
					w.RemoteAddr().String(),
					string(country),
					string(countries.CountryContinent[country]),
				},
			}}

			m.Authoritative = true
			w.Write(m)
			return
		}

		// return NXDOMAIN
		m.SetRcode(req, dns.RcodeNameError)
		m.Authoritative = true

		m.Ns = []dns.RR{z.SoaRR()}

		w.Write(m)
		return
	}

	if servers := labels.Picker(qtype, labels.MaxHosts); servers != nil {
		var rrs []dns.RR
		for _, record := range servers {
			rr := record.RR
			rr.Header().Name = req.Question[0].Name
			rrs = append(rrs, rr)
		}
		m.Answer = rrs
	}

	if len(m.Answer) == 0 {
		if labels := z.Labels[label]; labels != nil {
			if _, ok := labels.Records[dns.TypeCNAME]; ok {
				cname := labels.firstRR(dns.TypeCNAME)
				m.Answer = append(m.Answer, cname)
			}
		} else {
			m.Ns = append(m.Ns, z.SoaRR())
		}
	}

	logPrintln(m)

	err := w.Write(m)
	if err != nil {
		// if Pack'ing fails the Write fails. Return SERVFAIL.
		log.Println("Error writing packet", m)
		dns.HandleFailed(w, req)
//.........这里部分代码省略.........