func ExamplePrivateHandle() {
dns.PrivateHandle("APAIR", TypeAPAIR, NewAPAIR)
defer dns.PrivateHandleRemove(TypeAPAIR)
rr, err := dns.NewRR("miek.nl. APAIR (1.2.3.4 1.2.3.5)")
if err != nil {
log.Fatal("could not parse APAIR record: ", err)
}
fmt.Println(rr)
// Output: miek.nl. 3600 IN APAIR 1.2.3.4 1.2.3.5
m := new(dns.Msg)
m.Id = 12345
m.SetQuestion("miek.nl.", TypeAPAIR)
m.Answer = append(m.Answer, rr)
fmt.Println(m)
// ;; opcode: QUERY, status: NOERROR, id: 12345
// ;; flags: rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
//
// ;; QUESTION SECTION:
// ;miek.nl. IN APAIR
//
// ;; ANSWER SECTION:
// miek.nl. 3600 IN APAIR 1.2.3.4 1.2.3.5
}
// Retrieve the MX records for miek.nl.
func ExampleMX() {
config, _ := dns.ClientConfigFromFile("/etc/resolv.conf")
c := new(dns.Client)
m := new(dns.Msg)
m.SetQuestion("miek.nl.", dns.TypeMX)
m.RecursionDesired = true
r, _, err := c.Exchange(m, config.Servers[0]+":"+config.Port)
if err != nil {
return
}
if r.Rcode != dns.RcodeSuccess {
return
}
for _, a := range r.Answer {
if mx, ok := a.(*dns.MX); ok {
fmt.Printf("%s\n", mx.String())
}
}
}
// Retrieve the DNSKEY records of a zone and convert them
// to DS records for SHA1, SHA256 and SHA384.
func ExampleDS(zone string) {
config, _ := dns.ClientConfigFromFile("/etc/resolv.conf")
c := new(dns.Client)
m := new(dns.Msg)
if zone == "" {
zone = "miek.nl"
}
m.SetQuestion(dns.Fqdn(zone), dns.TypeDNSKEY)
m.SetEdns0(4096, true)
r, _, err := c.Exchange(m, config.Servers[0]+":"+config.Port)
if err != nil {
return
}
if r.Rcode != dns.RcodeSuccess {
return
}
for _, k := range r.Answer {
if key, ok := k.(*dns.DNSKEY); ok {
for _, alg := range []uint8{dns.SHA1, dns.SHA256, dns.SHA384} {
fmt.Printf("%s; %d\n", key.ToDS(alg).String(), key.Flags)
}
}
}
}
func (wb *workbench) dnsHandler(w dns.ResponseWriter, r *dns.Msg) {
wb.mu.RLock()
defer wb.mu.RUnlock()
defer w.Close()
m := new(dns.Msg)
m.SetReply(r)
m.Compress = wb.compression
if len(r.Question) > 1 || r.Rcode != dns.OpcodeQuery {
m.Rcode = dns.RcodeNotImplemented
} else if len(r.Question) == 0 {
m.Rcode = dns.RcodeFormatError
}
if m.Rcode == dns.RcodeFormatError || m.Rcode == dns.RcodeNotImplemented {
w.WriteMsg(m)
return
}
q := &r.Question[0]
wb.l.Printf("Received query for [%s] %s\n", dns.TypeToString[q.Qtype], q.Name)
allRecords, present := wb.z[q.Name]
if !present {
m.Rcode = dns.RcodeNameError
w.WriteMsg(m)
return
}
if auth, present := wb.a[q.Name]; present {
m.Authoritative = true
m.Ns = append(m.Ns, *auth)
}
qRecords, present := allRecords[q.Qtype]
if !present {
m.Rcode = dns.RcodeNXRrset
w.WriteMsg(m)
return
}
m.Answer = append(m.Answer, qRecords...)
w.WriteMsg(m)
return
}
