120 lines
3 KiB
Go
120 lines
3 KiB
Go
package integration
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import (
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"fmt"
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"net"
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"os"
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"github.com/miekg/dns"
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"github.com/traefik/traefik/v2/pkg/log"
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)
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type handler struct{}
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// ServeDNS a fake DNS server
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// Simplified version of the Challenge Test Server from Boulder
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// https://github.com/letsencrypt/boulder/blob/a6597b9f120207eff192c3e4107a7e49972a0250/test/challtestsrv/dnsone.go#L40
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func (s *handler) ServeDNS(w dns.ResponseWriter, r *dns.Msg) {
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logger := log.WithoutContext()
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m := new(dns.Msg)
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m.SetReply(r)
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m.Compress = false
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fakeDNS := os.Getenv("DOCKER_HOST_IP")
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if fakeDNS == "" {
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fakeDNS = "127.0.0.1"
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}
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for _, q := range r.Question {
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logger.Infof("Query -- [%s] %s", q.Name, dns.TypeToString[q.Qtype])
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switch q.Qtype {
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case dns.TypeA:
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record := new(dns.A)
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record.Hdr = dns.RR_Header{
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Name: q.Name,
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Rrtype: dns.TypeA,
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Class: dns.ClassINET,
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Ttl: 0,
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}
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record.A = net.ParseIP(fakeDNS)
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m.Answer = append(m.Answer, record)
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case dns.TypeCAA:
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addCAARecord := true
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var value string
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switch q.Name {
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case "bad-caa-reserved.com.":
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value = "sad-hacker-ca.invalid"
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case "good-caa-reserved.com.":
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value = "happy-hacker-ca.invalid"
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case "accounturi.good-caa-reserved.com.":
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uri := os.Getenv("ACCOUNT_URI")
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value = fmt.Sprintf("happy-hacker-ca.invalid; accounturi=%s", uri)
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case "recheck.good-caa-reserved.com.":
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// Allow issuance when we're running in the past
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// (under FAKECLOCK), otherwise deny issuance.
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if os.Getenv("FAKECLOCK") != "" {
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value = "happy-hacker-ca.invalid"
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} else {
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value = "sad-hacker-ca.invalid"
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}
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case "dns-01-only.good-caa-reserved.com.":
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value = "happy-hacker-ca.invalid; validationmethods=dns-01"
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case "http-01-only.good-caa-reserved.com.":
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value = "happy-hacker-ca.invalid; validationmethods=http-01"
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case "dns-01-or-http-01.good-caa-reserved.com.":
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value = "happy-hacker-ca.invalid; validationmethods=dns-01,http-01"
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default:
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addCAARecord = false
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}
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if addCAARecord {
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record := new(dns.CAA)
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record.Hdr = dns.RR_Header{
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Name: q.Name,
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Rrtype: dns.TypeCAA,
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Class: dns.ClassINET,
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Ttl: 0,
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}
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record.Tag = "issue"
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record.Value = value
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m.Answer = append(m.Answer, record)
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}
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}
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}
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auth := new(dns.SOA)
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auth.Hdr = dns.RR_Header{Name: "boulder.invalid.", Rrtype: dns.TypeSOA, Class: dns.ClassINET, Ttl: 0}
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auth.Ns = "ns.boulder.invalid."
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auth.Mbox = "master.boulder.invalid."
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auth.Serial = 1
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auth.Refresh = 1
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auth.Retry = 1
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auth.Expire = 1
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auth.Minttl = 1
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m.Ns = append(m.Ns, auth)
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if err := w.WriteMsg(m); err != nil {
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logger.Fatalf("Failed to write message %v", err)
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}
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}
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func startFakeDNSServer() *dns.Server {
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srv := &dns.Server{
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Addr: ":5053",
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Net: "udp",
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Handler: &handler{},
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}
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go func() {
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log.WithoutContext().Infof("Start a fake DNS server.")
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if err := srv.ListenAndServe(); err != nil {
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log.WithoutContext().Fatalf("Failed to set udp listener %v", err)
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}
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}()
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return srv
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}
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