78 lines
1.8 KiB
Go
78 lines
1.8 KiB
Go
package main
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// Print the version.bind and hostname.bind for each
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// address of NAMESERVER
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// (c) Miek Gieben - 2011
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import (
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"dns"
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"os"
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"fmt"
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)
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func main() {
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c, _ := dns.ClientConfigFromFile("/etc/resolv.conf")
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if len(os.Args) != 2 {
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fmt.Printf("%s DOMAIN\n", os.Args[0])
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os.Exit(1)
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}
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m := new(dns.Msg)
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m.Question = make([]dns.Question, 1)
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d := new(dns.Conn)
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d.RemoteAddr = c.Servers[0]
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for _, a := range addresses(d, os.Args[0]) {
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d.RemoteAddr = a
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if err := d.Dial("udp"); err != nil {
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fmt.Printf("%v\n", err)
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os.Exit(1)
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}
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m.Question[0] = dns.Question{"version.bind.", dns.TypeTXT, dns.ClassCHAOS}
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in, _ := dns.SimpleQuery("udp", d, m)
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if in != nil && in.Answer != nil {
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fmt.Printf("%v\n", in.Answer[0])
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}
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m.Question[0] = dns.Question{"hostname.bind.", dns.TypeTXT, dns.ClassCHAOS}
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in, _ = dns.SimpleQuery("udp", d, m)
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if in != nil && in.Answer != nil {
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fmt.Printf("%v\n", in.Answer[0])
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}
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}
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}
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func addresses(d *dns.Conn, name string) []string {
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m := new(dns.Msg)
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m.MsgHdr.RecursionDesired = true //only set this bit
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m.Question = make([]dns.Question, 1)
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var ips []string
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m.Question[0] = dns.Question{os.Args[1], dns.TypeA, dns.ClassINET}
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in, err := dns.SimpleQuery("udp", d, m)
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if in == nil {
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fmt.Printf("Nothing recevied: %s\n", err.String())
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return nil
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}
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if in.Rcode != dns.RcodeSuccess {
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return nil
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}
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// Stuff must be in the answer section
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for _, a := range in.Answer {
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ips = append(ips, a.(*dns.RR_A).A.String()+":53")
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}
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m.Question[0] = dns.Question{os.Args[1], dns.TypeAAAA, dns.ClassINET}
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in, err = dns.SimpleQuery("udp", d, m)
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if in == nil {
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fmt.Printf("Nothing recevied: %s\n", err.String())
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return ips
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}
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if in.Rcode != dns.RcodeSuccess {
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return ips
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}
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for _, a := range in.Answer {
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ips = append(ips, "["+a.(*dns.RR_AAAA).AAAA.String()+"]:53")
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}
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return ips
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}
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