mirror of
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75 lines
1.7 KiB
Go
75 lines
1.7 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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if len(os.Args) != 2 {
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fmt.Printf("%s NAMESERVER\n", os.Args[0])
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os.Exit(1)
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}
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conf, _ := dns.ClientConfigFromFile("/etc/resolv.conf")
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m := new(dns.Msg)
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m.Question = make([]dns.Question, 1)
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c := dns.NewClient()
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// Todo: in parallel
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addr := addresses(conf, c, os.Args[0])
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if len(addr) == 0 {
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fmt.Printf("No address found for %s\n", os.Args[1])
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os.Exit(1)
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}
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for _, a := range addr {
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m.Question[0] = dns.Question{"version.bind.", dns.TypeTXT, dns.ClassCHAOS}
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in := c.Exchange(m, a)
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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 = c.Exchange(m, a)
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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(conf *dns.ClientConfig, c *dns.Client, name string) []string {
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m := new(dns.Msg)
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m.SetQuestion(os.Args[1], dns.TypeA) // Allocates space
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var ips []string
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r := c.Exchange(m, conf.Servers[0])
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if r == nil {
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fmt.Printf("Nothing recevied for %s\n", name)
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return nil
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}
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if r.Rcode != dns.RcodeSuccess {
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return nil
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}
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for _, a := range r.Answer {
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ips = append(ips, a.(*dns.RR_A).A.String()+":53")
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}
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m.SetQuestion(os.Args[1], dns.TypeAAAA)
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r = c.Exchange(m, conf.Servers[0])
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if r == nil {
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fmt.Printf("Nothing recevied for %s\n", name)
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return ips
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}
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if r.Rcode != dns.RcodeSuccess {
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return ips
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}
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for _, a := range r.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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