Golang msg.Domain函数代码示例

// NSRecords returns NS records from etcd.
func (s *server) NSRecords(q dns.Question, name string) (records []dns.RR, extra []dns.RR, err error) {
	services, err := s.backend.Records(name, false)
	if err != nil {
		return nil, nil, err
	}

	services = msg.Group(services)

	for _, serv := range services {
		ip := net.ParseIP(serv.Host)
		switch {
		case ip == nil:
			return nil, nil, fmt.Errorf("NS record must be an IP address")
		case ip.To4() != nil:
			serv.Host = msg.Domain(serv.Key)
			records = append(records, serv.NewNS(q.Name, serv.Host))
			extra = append(extra, serv.NewA(serv.Host, ip.To4()))
		case ip.To4() == nil:
			serv.Host = msg.Domain(serv.Key)
			records = append(records, serv.NewNS(q.Name, serv.Host))
			extra = append(extra, serv.NewAAAA(serv.Host, ip.To16()))
		}
	}
	return records, extra, nil
}

// MXRecords returns MX records from etcd.
// If the Target is not a name but an IP address, a name is created.
func (s *server) MXRecords(q dns.Question, name string, bufsize uint16, dnssec bool) (records []dns.RR, extra []dns.RR, err error) {

	return nil, nil, errors.New("Not Implement !")

	services, err := s.backend.Records(name, false)
	if err != nil {
		return nil, nil, err
	}

	lookup := make(map[string]bool)
	for _, serv := range services {
		if !serv.Mail {
			continue
		}
		ip := net.ParseIP(serv.Host)
		switch {
		case ip == nil:
			mx := serv.NewMX(q.Name)
			records = append(records, mx)
			if _, ok := lookup[mx.Mx]; ok {
				break
			}

			lookup[mx.Mx] = true

			if !dns.IsSubDomain(s.config.Domain, mx.Mx) {
				m1, e1 := s.Lookup(mx.Mx, dns.TypeA, bufsize, dnssec)
				if e1 == nil {
					extra = append(extra, m1.Answer...)
				}
				m1, e1 = s.Lookup(mx.Mx, dns.TypeAAAA, bufsize, dnssec)
				if e1 == nil {
					// If we have seen CNAME's we *assume* that they are already added.
					for _, a := range m1.Answer {
						if _, ok := a.(*dns.CNAME); !ok {
							extra = append(extra, a)
						}
					}
				}
				break
			}
			// Internal name
			addr, e1 := s.AddressRecords(dns.Question{mx.Mx, dns.ClassINET, dns.TypeA},
				mx.Mx, nil, bufsize, dnssec, true)
			if e1 == nil {
				extra = append(extra, addr...)
			}
		case ip.To4() != nil:
			serv.Host = msg.Domain(serv.Key)
			records = append(records, serv.NewMX(q.Name))
			extra = append(extra, serv.NewA(serv.Host, ip.To4()))
		case ip.To4() == nil:
			serv.Host = msg.Domain(serv.Key)
			records = append(records, serv.NewMX(q.Name))
			extra = append(extra, serv.NewAAAA(serv.Host, ip.To16()))
		}
	}
	return records, extra, nil
}

// NSRecords returns NS records from etcd.
func (s *server) NSRecords(q dns.Question, name string) (records []dns.RR, extra []dns.RR, err error) {
	path, star := msg.PathWithWildcard(name)
	r, err := get(s.client, path, true)
	if err != nil {
		return nil, nil, err
	}
	if !r.Node.Dir { // single element
		serv := new(msg.Service)
		if err := json.Unmarshal([]byte(r.Node.Value), serv); err != nil {
			s.config.log.Infof("failed to parse json: %s", err.Error())
			return nil, nil, err
		}
		ip := net.ParseIP(serv.Host)
		ttl := s.calculateTtl(r.Node, serv)
		serv.Key = r.Node.Key
		serv.Ttl = ttl
		switch {
		case ip == nil:
			return nil, nil, fmt.Errorf("NS record must be an IP address")
		case ip.To4() != nil:
			serv.Host = msg.Domain(serv.Key)
			records = append(records, serv.NewNS(q.Name, serv.Host))
			extra = append(extra, serv.NewA(serv.Host, ip.To4()))
		case ip.To4() == nil:
			serv.Host = msg.Domain(serv.Key)
			records = append(records, serv.NewNS(q.Name, serv.Host))
			extra = append(extra, serv.NewAAAA(serv.Host, ip.To16()))
		}
		return records, extra, nil
	}

	sx, err := s.loopNodes(&r.Node.Nodes, strings.Split(msg.Path(name), "/"), star, nil)
	if err != nil || len(sx) == 0 {
		return nil, nil, err
	}
	for _, serv := range sx {
		ip := net.ParseIP(serv.Host)
		switch {
		case ip == nil:
			return nil, nil, fmt.Errorf("NS record must be an IP address")
		case ip.To4() != nil:
			serv.Host = msg.Domain(serv.Key)
			records = append(records, serv.NewNS(q.Name, serv.Host))
			extra = append(extra, serv.NewA(serv.Host, ip.To4()))
		case ip.To4() == nil:
			serv.Host = msg.Domain(serv.Key)
			records = append(records, serv.NewNS(q.Name, serv.Host))
			extra = append(extra, serv.NewAAAA(serv.Host, ip.To16()))
		}
	}
	return records, extra, nil
}

// Look in .../dns/stub/<domain>/xx for msg.Services. Loop through them
// extract <domain> and add them as forwarders (ip:port-combos) for
// the stub zones. Only numeric (i.e. IP address) hosts are used.
func (s *server) UpdateStubZones() {
	stubmap := make(map[string][]string)

	services, err := s.backend.Records("stub.dns."+s.config.Domain, false, net.IP{})
	if err != nil {
		logf("stub zone update failed: %s", err)
		return
	}
	for _, serv := range services {
		if serv.Port == 0 {
			serv.Port = 53
		}
		ip := net.ParseIP(serv.Host)
		if ip == nil {
			logf("stub zone non-address %s seen for: %s", serv.Key, serv.Host)
			continue
		}

		domain := msg.Domain(serv.Key)
		// Chop of left most label, because that is used as the nameserver place holder
		// and drop the right most labels that belong to localDomain.
		labels := dns.SplitDomainName(domain)
		domain = dns.Fqdn(strings.Join(labels[1:len(labels)-dns.CountLabel(s.config.localDomain)], "."))

		// If the remaining name equals s.config.LocalDomain we ignore it.
		if domain == s.config.localDomain {
			logf("not adding stub zone for my own domain")
			continue
		}
		stubmap[domain] = append(stubmap[domain], net.JoinHostPort(serv.Host, strconv.Itoa(serv.Port)))
	}

	s.config.stub = &stubmap
}

// SRVRecords returns SRV records from etcd.
// If the Target is not a name but an IP address, a name is created.
func (s *server) SRVRecords(q dns.Question, name string, bufsize uint16, dnssec bool) (records []dns.RR, extra []dns.RR, err error) {
	services, err := s.backend.Records(name, false)
	if err != nil {
		return nil, nil, err
	}

	services = msg.Group(services)

	// Looping twice to get the right weight vs priority
	w := make(map[int]int)
	for _, serv := range services {
		weight := 100
		if serv.Weight != 0 {
			weight = serv.Weight
		}
		if _, ok := w[serv.Priority]; !ok {
			w[serv.Priority] = weight
			continue
		}
		w[serv.Priority] += weight
	}
	lookup := make(map[string]bool)
	for _, serv := range services {
		w1 := 100.0 / float64(w[serv.Priority])
		if serv.Weight == 0 {
			w1 *= 100
		} else {
			w1 *= float64(serv.Weight)
		}
		weight := uint16(math.Floor(w1))
		ip := net.ParseIP(serv.Host)
		switch {
		case ip == nil:
			srv := serv.NewSRV(q.Name, weight)
			records = append(records, srv)

			if _, ok := lookup[srv.Target]; ok {
				break
			}

			lookup[srv.Target] = true

			if !dns.IsSubDomain(s.config.Domain, srv.Target) {
				log.Printf("skydns: target %q is not sub of %q, looking up...", srv.Target, s.config.Domain)
				m1, e1 := s.Lookup(srv.Target, dns.TypeA, bufsize, dnssec)
				if e1 == nil {
					extra = append(extra, m1.Answer...)
				}
				m1, e1 = s.Lookup(srv.Target, dns.TypeAAAA, bufsize, dnssec)
				if e1 == nil {
					// If we have seen CNAME's we *assume* that they are already added.
					for _, a := range m1.Answer {
						if _, ok := a.(*dns.CNAME); !ok {
							extra = append(extra, a)
						}
					}
				}
				break
			}
			// Internal name, we should have some info on them, either v4 or v6
			// Clients expect a complete answer, because we are a recursor in their
			// view.
			addr, e1 := s.AddressRecords(dns.Question{srv.Target, dns.ClassINET, dns.TypeA},
				srv.Target, nil, bufsize, dnssec, true)
			if e1 == nil {
				extra = append(extra, addr...)
			}
		case ip.To4() != nil:
			serv.Host = msg.Domain(serv.Key)
			records = append(records, serv.NewSRV(q.Name, weight))
			extra = append(extra, serv.NewA(serv.Host, ip.To4()))
		case ip.To4() == nil:
			serv.Host = msg.Domain(serv.Key)
			records = append(records, serv.NewSRV(q.Name, weight))
			extra = append(extra, serv.NewAAAA(serv.Host, ip.To16()))
		}
	}
	return records, extra, nil
}

// SRVRecords returns SRV records from etcd.
// If the Target is not an name but an IP address, an name is created .
func (s *server) SRVRecords(q dns.Question, name string, bufsize uint16, dnssec bool) (records []dns.RR, extra []dns.RR, err error) {
	path, star := msg.PathWithWildcard(name)
	r, err := get(s.client, path, true)
	if err != nil {
		return nil, nil, err
	}
	if !r.Node.Dir { // single element
		serv := new(msg.Service)
		if err := json.Unmarshal([]byte(r.Node.Value), serv); err != nil {
			s.config.log.Infof("failed to parse json: %s", err.Error())
			return nil, nil, err
		}
		ip := net.ParseIP(serv.Host)
		ttl := s.calculateTtl(r.Node, serv)
		if serv.Priority == 0 {
			serv.Priority = int(s.config.Priority)
		}
		serv.Key = r.Node.Key
		serv.Ttl = ttl
		switch {
		case ip == nil:
			srv := serv.NewSRV(q.Name, uint16(100))
			records = append(records, srv)
			if !dns.IsSubDomain(s.config.Domain, srv.Target) {
				m1, e1 := s.Lookup(srv.Target, dns.TypeA, bufsize, dnssec)
				if e1 == nil {
					extra = append(extra, m1.Answer...)
				}
				m1, e1 = s.Lookup(srv.Target, dns.TypeAAAA, bufsize, dnssec)
				if e1 == nil {
					// If we have seen CNAME's we *assume* that they already added.
					for _, a := range m1.Answer {
						if _, ok := a.(*dns.CNAME); !ok {
							extra = append(extra, a)
						}
					}
				}
			}
		case ip.To4() != nil:
			serv.Host = msg.Domain(serv.Key)
			records = append(records, serv.NewSRV(q.Name, uint16(100)))
			extra = append(extra, serv.NewA(serv.Host, ip.To4()))
		case ip.To4() == nil:
			serv.Host = msg.Domain(serv.Key)
			records = append(records, serv.NewSRV(q.Name, uint16(100)))
			extra = append(extra, serv.NewAAAA(serv.Host, ip.To16()))
		}
		return records, extra, nil
	}

	sx, err := s.loopNodes(&r.Node.Nodes, strings.Split(msg.Path(name), "/"), star, nil)
	if err != nil || len(sx) == 0 {
		return nil, nil, err
	}
	// Looping twice to get the right weight vs priority
	w := make(map[int]int)
	for _, serv := range sx {
		weight := 100
		if serv.Weight != 0 {
			weight = serv.Weight
		}
		if _, ok := w[serv.Priority]; !ok {
			w[serv.Priority] = weight
			continue
		}
		w[serv.Priority] += weight
	}
	lookup := make(map[string]bool)
	for _, serv := range sx {
		w1 := 100.0 / float64(w[serv.Priority])
		if serv.Weight == 0 {
			w1 *= 100
		} else {
			w1 *= float64(serv.Weight)
		}
		weight := uint16(math.Floor(w1))
		ip := net.ParseIP(serv.Host)
		switch {
		case ip == nil:
			srv := serv.NewSRV(q.Name, weight)
			records = append(records, srv)
			if _, ok := lookup[srv.Target]; !ok {
				if !dns.IsSubDomain(s.config.Domain, srv.Target) {
					m1, e1 := s.Lookup(srv.Target, dns.TypeA, bufsize, dnssec)
					if e1 == nil {
						extra = append(extra, m1.Answer...)
					}
					m1, e1 = s.Lookup(srv.Target, dns.TypeAAAA, bufsize, dnssec)
					if e1 == nil {
						// If we have seen CNAME's we *assume* that they are already added.
						for _, a := range m1.Answer {
							if _, ok := a.(*dns.CNAME); !ok {
								extra = append(extra, a)
							}
						}
					}
				}
			}
//.........这里部分代码省略.........