示例#1
0
func mockDNSQuery(w dns.ResponseWriter, r *dns.Msg) {
	defer w.Close()
	m := new(dns.Msg)
	m.SetReply(r)
	m.Compress = false

	for _, q := range r.Question {
		if q.Name == "servfail.com." {
			m.Rcode = dns.RcodeServerFailure
			w.WriteMsg(m)
			return
		}
		switch q.Qtype {
		case dns.TypeSOA:
			record := new(dns.SOA)
			record.Hdr = dns.RR_Header{Name: "letsencrypt.org.", Rrtype: dns.TypeSOA, Class: dns.ClassINET, Ttl: 0}
			record.Ns = "ns.letsencrypt.org."
			record.Mbox = "master.letsencrypt.org."
			record.Serial = 1
			record.Refresh = 1
			record.Retry = 1
			record.Expire = 1
			record.Minttl = 1

			m.Answer = append(m.Answer, record)
			w.WriteMsg(m)
			return
		case dns.TypeA:
			if q.Name == "cps.letsencrypt.org." {
				record := new(dns.A)
				record.Hdr = dns.RR_Header{Name: "cps.letsencrypt.org.", Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 0}
				record.A = net.ParseIP("127.0.0.1")

				m.Answer = append(m.Answer, record)
				w.WriteMsg(m)
				return
			}
		case dns.TypeCAA:
			if q.Name == "bracewel.net." {
				record := new(dns.CAA)
				record.Hdr = dns.RR_Header{Name: "bracewel.net.", Rrtype: dns.TypeCAA, Class: dns.ClassINET, Ttl: 0}
				record.Tag = "issue"
				record.Value = "letsencrypt.org"
				record.Flag = 1

				m.Answer = append(m.Answer, record)
				w.WriteMsg(m)
				return
			}
		}
	}

	w.WriteMsg(m)
	return
}
示例#2
0
func mockDNSQuery(w dns.ResponseWriter, r *dns.Msg) {
	m := new(dns.Msg)
	m.SetReply(r)
	m.Compress = false

	appendAnswer := func(rr dns.RR) {
		m.Answer = append(m.Answer, rr)
	}
	for _, q := range r.Question {
		q.Name = strings.ToLower(q.Name)
		if q.Name == "servfail.com." {
			m.Rcode = dns.RcodeServerFailure
			break
		}
		switch q.Qtype {
		case dns.TypeSOA:
			record := new(dns.SOA)
			record.Hdr = dns.RR_Header{Name: "letsencrypt.org.", Rrtype: dns.TypeSOA, Class: dns.ClassINET, Ttl: 0}
			record.Ns = "ns.letsencrypt.org."
			record.Mbox = "master.letsencrypt.org."
			record.Serial = 1
			record.Refresh = 1
			record.Retry = 1
			record.Expire = 1
			record.Minttl = 1
			appendAnswer(record)
		case dns.TypeAAAA:
			if q.Name == "v6.letsencrypt.org." {
				record := new(dns.AAAA)
				record.Hdr = dns.RR_Header{Name: "v6.letsencrypt.org.", Rrtype: dns.TypeAAAA, Class: dns.ClassINET, Ttl: 0}
				record.AAAA = net.ParseIP("::1")
				appendAnswer(record)
			}
		case dns.TypeA:
			if q.Name == "cps.letsencrypt.org." {
				record := new(dns.A)
				record.Hdr = dns.RR_Header{Name: "cps.letsencrypt.org.", Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 0}
				record.A = net.ParseIP("127.0.0.1")
				appendAnswer(record)
			}
			if q.Name == "nxdomain.letsencrypt.org." {
				m.SetRcode(r, dns.RcodeNameError)
			}
		case dns.TypeCNAME:
			if q.Name == "cname.letsencrypt.org." {
				record := new(dns.CNAME)
				record.Hdr = dns.RR_Header{Name: "cname.letsencrypt.org.", Rrtype: dns.TypeCNAME, Class: dns.ClassINET, Ttl: 30}
				record.Target = "cps.letsencrypt.org."
				appendAnswer(record)
			}
			if q.Name == "cname.example.com." {
				record := new(dns.CNAME)
				record.Hdr = dns.RR_Header{Name: "cname.example.com.", Rrtype: dns.TypeCNAME, Class: dns.ClassINET, Ttl: 30}
				record.Target = "CAA.example.com."
				appendAnswer(record)
			}
		case dns.TypeDNAME:
			if q.Name == "dname.letsencrypt.org." {
				record := new(dns.DNAME)
				record.Hdr = dns.RR_Header{Name: "dname.letsencrypt.org.", Rrtype: dns.TypeDNAME, Class: dns.ClassINET, Ttl: 30}
				record.Target = "cps.letsencrypt.org."
				appendAnswer(record)
			}
		case dns.TypeCAA:
			if q.Name == "bracewel.net." || q.Name == "caa.example.com." {
				record := new(dns.CAA)
				record.Hdr = dns.RR_Header{Name: q.Name, Rrtype: dns.TypeCAA, Class: dns.ClassINET, Ttl: 0}
				record.Tag = "issue"
				record.Value = "letsencrypt.org"
				record.Flag = 1
				appendAnswer(record)
			}
			if q.Name == "cname.example.com." {
				record := new(dns.CAA)
				record.Hdr = dns.RR_Header{Name: "caa.example.com.", Rrtype: dns.TypeCAA, Class: dns.ClassINET, Ttl: 0}
				record.Tag = "issue"
				record.Value = "letsencrypt.org"
				record.Flag = 1
				appendAnswer(record)
			}
		case dns.TypeTXT:
			if q.Name == "split-txt.letsencrypt.org." {
				record := new(dns.TXT)
				record.Hdr = dns.RR_Header{Name: "split-txt.letsencrypt.org.", Rrtype: dns.TypeTXT, Class: dns.ClassINET, Ttl: 0}
				record.Txt = []string{"a", "b", "c"}
				appendAnswer(record)
			} else {
				auth := new(dns.SOA)
				auth.Hdr = dns.RR_Header{Name: "letsencrypt.org.", Rrtype: dns.TypeSOA, Class: dns.ClassINET, Ttl: 0}
				auth.Ns = "ns.letsencrypt.org."
				auth.Mbox = "master.letsencrypt.org."
				auth.Serial = 1
				auth.Refresh = 1
				auth.Retry = 1
				auth.Expire = 1
				auth.Minttl = 1
				m.Ns = append(m.Ns, auth)
			}
			if q.Name == "nxdomain.letsencrypt.org." {
				m.SetRcode(r, dns.RcodeNameError)
			}
		}
	}

	w.WriteMsg(m)
	return
}
示例#3
0
func (ts *testSrv) dnsHandler(w dns.ResponseWriter, r *dns.Msg) {
	m := new(dns.Msg)
	m.SetReply(r)
	m.Compress = false

	// Normally this test DNS server will return 127.0.0.1 for everything.
	// However, in some situations (for instance Docker), it's useful to return a
	// different hardcoded host. You can do so by setting the FAKE_DNS environment
	// variable.
	fakeDNS := os.Getenv("FAKE_DNS")
	if fakeDNS == "" {
		fakeDNS = "127.0.0.1"
	}
	for _, q := range r.Question {
		fmt.Printf("dns-srv: Query -- [%s] %s\n", q.Name, dns.TypeToString[q.Qtype])
		switch q.Qtype {
		case dns.TypeA:
			record := new(dns.A)
			record.Hdr = dns.RR_Header{
				Name:   q.Name,
				Rrtype: dns.TypeA,
				Class:  dns.ClassINET,
				Ttl:    0,
			}
			record.A = net.ParseIP(fakeDNS)

			m.Answer = append(m.Answer, record)
		case dns.TypeMX:
			record := new(dns.MX)
			record.Hdr = dns.RR_Header{
				Name:   q.Name,
				Rrtype: dns.TypeMX,
				Class:  dns.ClassINET,
				Ttl:    0,
			}
			record.Mx = "mail." + q.Name
			record.Preference = 10

			m.Answer = append(m.Answer, record)
		case dns.TypeTXT:
			ts.mu.RLock()
			value, present := ts.txtRecords[q.Name]
			ts.mu.RUnlock()
			if !present {
				continue
			}
			record := new(dns.TXT)
			record.Hdr = dns.RR_Header{
				Name:   q.Name,
				Rrtype: dns.TypeTXT,
				Class:  dns.ClassINET,
				Ttl:    0,
			}
			record.Txt = []string{value}
			m.Answer = append(m.Answer, record)
		case dns.TypeCAA:
			if q.Name == "bad-caa-reserved.com." || q.Name == "good-caa-reserved.com." {
				record := new(dns.CAA)
				record.Hdr = dns.RR_Header{
					Name:   q.Name,
					Rrtype: dns.TypeCAA,
					Class:  dns.ClassINET,
					Ttl:    0,
				}
				record.Tag = "issue"
				if q.Name == "bad-caa-reserved.com." {
					record.Value = "sad-hacker-ca.invalid"
				} else if q.Name == "good-caa-reserved.com." {
					record.Value = "happy-hacker-ca.invalid"
				}
				m.Answer = append(m.Answer, record)
			}
		}
	}

	auth := new(dns.SOA)
	auth.Hdr = dns.RR_Header{Name: "boulder.invalid.", Rrtype: dns.TypeSOA, Class: dns.ClassINET, Ttl: 0}
	auth.Ns = "ns.boulder.invalid."
	auth.Mbox = "master.boulder.invalid."
	auth.Serial = 1
	auth.Refresh = 1
	auth.Retry = 1
	auth.Expire = 1
	auth.Minttl = 1
	m.Ns = append(m.Ns, auth)

	w.WriteMsg(m)
	return
}