func main() {
c, _ := dns.ClientConfigFromFile("/etc/resolv.conf")
if len(os.Args) != 2 {
fmt.Printf("%s DOMAIN\n", os.Args[0])
os.Exit(1)
}
m := new(dns.Msg)
m.Question = make([]dns.Question, 1)
d := new(dns.Conn)
d.RemoteAddr = c.Servers[0]
for _, a := range addresses(d, os.Args[0]) {
d.RemoteAddr = a
if err := d.Dial("udp"); err != nil {
fmt.Printf("%v\n", err)
os.Exit(1)
}
m.Question[0] = dns.Question{"version.bind.", dns.TypeTXT, dns.ClassCHAOS}
in, _ := dns.SimpleQuery("udp", d, m)
if in != nil && in.Answer != nil {
fmt.Printf("%v\n", in.Answer[0])
}
m.Question[0] = dns.Question{"hostname.bind.", dns.TypeTXT, dns.ClassCHAOS}
in, _ = dns.SimpleQuery("udp", d, m)
if in != nil && in.Answer != nil {
fmt.Printf("%v\n", in.Answer[0])
}
}
}
func addresses(d *dns.Conn, name string) []string {
m := new(dns.Msg)
m.MsgHdr.RecursionDesired = true //only set this bit
m.Question = make([]dns.Question, 1)
var ips []string
m.Question[0] = dns.Question{os.Args[1], dns.TypeA, dns.ClassINET}
in, err := dns.SimpleQuery("udp", d, m)
if in == nil {
fmt.Printf("Nothing recevied: %s\n", err.String())
return nil
}
if in.Rcode != dns.RcodeSuccess {
return nil
}
// Stuff must be in the answer section
for _, a := range in.Answer {
ips = append(ips, a.(*dns.RR_A).A.String()+":53")
}
m.Question[0] = dns.Question{os.Args[1], dns.TypeAAAA, dns.ClassINET}
in, err = dns.SimpleQuery("udp", d, m)
if in == nil {
fmt.Printf("Nothing recevied: %s\n", err.String())
return ips
}
if in.Rcode != dns.RcodeSuccess {
return ips
}
for _, a := range in.Answer {
ips = append(ips, "["+a.(*dns.RR_AAAA).AAAA.String()+"]:53")
}
return ips
}
func main() {
c, err := dns.ClientConfigFromFile("/etc/resolv.conf")
if len(os.Args) != 2 || err != nil {
fmt.Printf("%s DOMAIN\n", os.Args[0])
os.Exit(1)
}
m := new(dns.Msg)
m.MsgHdr.RecursionDesired = true //only set this bit
m.Question = make([]dns.Question, 1)
m.Question[0] = dns.Question{os.Args[1], dns.TypeDNSKEY, dns.ClassINET}
d := new(dns.Conn)
d.RemoteAddr = c.Servers[0]
in, err := dns.SimpleQuery("udp", d, m)
if in != nil {
if in.Rcode != dns.RcodeSuccess {
fmt.Printf(" *** invalid answer name %s after DNSKEY query for %s\n", os.Args[1], os.Args[1])
os.Exit(1)
}
// Stuff must be in the answer section
for _, k := range in.Answer {
// Foreach key would need to provide a DS records, both sha1 and sha256
if key, ok := k.(*dns.RR_DNSKEY); ok {
ds := key.ToDS(dns.HashSHA1)
ds.Hdr.Ttl = 0
fmt.Printf("%v\n", ds)
ds = key.ToDS(dns.HashSHA256)
ds.Hdr.Ttl = 0
fmt.Printf("%v\n", ds)
}
}
} else {
fmt.Printf("*** error: %s\n", err.String())
}
}
func main() {
if len(os.Args) != 2 {
fmt.Printf("%s DOMAIN\n", os.Args[0])
os.Exit(1)
}
d := new(dns.Conn)
c, err := dns.ClientConfigFromFile("/etc/resolv.conf")
// Errorchecking
d.RemoteAddr = c.Servers[0]
m := new(dns.Msg)
m.Id = dns.Id()
m.MsgHdr.RecursionDesired = true
m.Question = make([]dns.Question, 1)
m.Question[0] = dns.Question{os.Args[1], dns.TypeMX, dns.ClassINET}
err = d.Dial("udp")
if err != nil {
fmt.Printf("*** error: %s\n", err.String())
os.Exit(1)
}
in, err := dns.SimpleQuery("udp", d, m)
if in != nil {
if in.Rcode != dns.RcodeSuccess {
fmt.Printf(" *** invalid answer name %s after MX query for %s\n", os.Args[1], os.Args[1])
os.Exit(1)
}
// Stuff must be in the answer section
for _, a := range in.Answer {
fmt.Printf("%v\n", a)
}
} else {
fmt.Printf("*** error: %s\n", err.String())
}
}