Golang Msg.SetRcode方法代碼示例

func handleQueryCHAOS(w dns.ResponseWriter, req *dns.Msg) {
	m := new(dns.Msg)
	qname := strings.ToLower(req.Question[0].Name)
	qtype := req.Question[0].Qtype
	qclass := req.Question[0].Qclass

	m.Extra = make([]dns.RR, 1)
	m.Extra[0] = spamCH

	if qclass != dns.ClassCHAOS {
		m.SetRcode(req, dns.RcodeServerFailure)
		send(w, m)
		return
	}

	if (qname == "version.bind." || qname == "id.server.") && qtype == dns.TypeTXT {
		m.SetReply(req)
		m.Answer = make([]dns.RR, 1)
		m.Answer[0] = &dns.RR_TXT{Hdr: dns.RR_Header{Name: qname,
			Rrtype: qtype, Class: qclass}, Txt: "NS 0.0.1"}
		send(w, m)
		return
	}
	if (qname == "authors.bind." || qname == "authors.server.") && qtype == dns.TypeTXT {
		m.SetReply(req)
		m.Answer = make([]dns.RR, 1)
		m.Answer[0] = &dns.RR_TXT{Hdr: dns.RR_Header{Name: qname,
			Rrtype: qtype, Class: qclass}, Txt: "Miek Gieben"}
		send(w, m)
		return
	}
	m.SetRcode(req, dns.RcodeServerFailure)
	send(w, m)
	return
}

func handleQuery(w dns.ResponseWriter, req *dns.Msg) {
	var dnssec bool
	m := new(dns.Msg)
	if req.Question[0].Qclass != dns.ClassINET {
		m.SetRcode(req, dns.RcodeServerFailure)
		send(w, m)
		return
	}
	m.SetReply(req)
	m.Ns = ns
	m.Extra = make([]dns.RR, 1)
	m.Extra[0] = spamIN

	// Check DNSSEC OK
	for _, v := range req.Extra {
		if o, ok := v.(*dns.RR_OPT); ok {
			if dnssec = o.Do(); dnssec {
				m.Extra = append(m.Extra, o)
				m.Ns = nsDNSSEC
				break
			}
		}
	}

	//m.Answer = make([]dns.RR, 0)
	s, _ := zone.LookupQuestion(req.Question[0])
	if s == nil {
		// Authority section should only contain the SOA record for NXDOMAIN
		m.Ns = m.Ns[:1]
		m.Ns[0] = soa
		m.MsgHdr.Rcode = dns.RcodeNameError
		send(w, m)
		// Lookup the previous name in the Nxt list for this zone
		// and insert the nsec/nsec3 from that. Also give the nsec
		// that proofs there is no wildcard
		return
	}

	// TODO CNAME
	//cname:
	switch req.Question[0].Qtype {
	case dns.TypeRRSIG:
		m.Answer = s.RRsigs
	case dns.TypeNSEC, dns.TypeNSEC3:
		m.Answer = []dns.RR{s.Nxt}
	default:
		m.Answer = s.RRs
	}
	if dnssec && req.Question[0].Qtype != dns.TypeRRSIG && len(s.RRsigs) > 0 {
		for _, r := range s.RRsigs {
			m.Answer = append(m.Answer, r)
		}
	}
	if *debug {
		println(m.Question[0].String())
	}
	send(w, m)
}

func handleReflect(w dns.ResponseWriter, r *dns.Msg) {
	var (
		v4  bool
		rr  dns.RR
		str string
		a   net.IP
	)
	m := new(dns.Msg)
	m.SetReply(r)
	if ip, ok := w.RemoteAddr().(*net.UDPAddr); ok {
		str = "Port: " + strconv.Itoa(ip.Port) + " (udp)"
		a = ip.IP
		v4 = a.To4() != nil
	}
	if ip, ok := w.RemoteAddr().(*net.TCPAddr); ok {
		str = "Port: " + strconv.Itoa(ip.Port) + " (tcp)"
		a = ip.IP
		v4 = a.To4() != nil
	}

	if v4 {
		rr = new(dns.RR_A)
		rr.(*dns.RR_A).Hdr = dns.RR_Header{Name: dom, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 0}
		rr.(*dns.RR_A).A = a.To4()
	} else {
		rr = new(dns.RR_AAAA)
		rr.(*dns.RR_AAAA).Hdr = dns.RR_Header{Name: dom, Rrtype: dns.TypeAAAA, Class: dns.ClassINET, Ttl: 0}
		rr.(*dns.RR_AAAA).AAAA = a
	}

	t := new(dns.RR_TXT)
	t.Hdr = dns.RR_Header{Name: dom, Rrtype: dns.TypeTXT, Class: dns.ClassINET, Ttl: 0}
	t.Txt = str

	switch r.Question[0].Qtype {
	case dns.TypeTXT:
		m.Answer = append(m.Answer, t)
		m.Extra = append(m.Extra, rr)
	default:
		fallthrough
	case dns.TypeAAAA, dns.TypeA:
		m.Answer = append(m.Answer, rr)
		m.Extra = append(m.Extra, t)

	}
	/*
	   nsec3 := new(dns.RR_NSEC3)
	   nsec3.Hdr = dns.RR_Header{Name: dom, Rrtype: dns.TypeNSEC3, Class: dns.ClassINET, Ttl: 0}
	   nsec3.Hash = dns.SHA1
	   nsec3.Flags = 0
	   nsec3.Iterations = 1
	   nsec3.Salt = "AABB"
	   nsec3.SaltLength = uint8(len(nsec3.Salt)/2)
	   nsec3.NextDomain = "miek.nl."
	   nsec3.TypeBitMap = []uint16{dns.TypeA, dns.TypeNS, dns.TypeSOA, dns.TypeTXT, dns.TypeRRSIG, 4000, 4001, 5949}
	   nsec3.HashNames("miek.nl.")
	   m.Extra = append(m.Extra, nsec3)
	*/

	b, ok := m.Pack()
	if *printf {
		fmt.Printf("%v\n", m.String())
	}
	if !ok {
		log.Print("Packing failed")
		m.SetRcode(r, dns.RcodeServerFailure)
		m.Extra = nil
		m.Answer = nil
		b, _ = m.Pack()
	}
	w.Write(b)
}