81 lines
1.9 KiB
Go
81 lines
1.9 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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"dns/resolver"
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"os"
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"fmt"
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"net"
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)
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func main() {
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r := new(resolver.Resolver)
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qr := resolver.NewQuerier(r)
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r.Servers = []string{"127.0.0.1"}
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r.Timeout = 2
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r.Attempts = 1
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var in resolver.DnsMsg
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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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m := new(dns.Msg)
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m.Question = make([]dns.Question, 1)
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for _, a := range addresses(qr, os.Args[0]) {
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// set the resolver to query the NS directly
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r.Servers = []string{a.String()}
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m.Question[0] = dns.Question{"version.bind.", dns.TypeTXT, dns.ClassCHAOS}
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qr <- resolver.DnsMsg{m, nil}
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in = <-qr
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if in.Dns != nil && in.Dns.Answer != nil {
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fmt.Printf("%v\n", in.Dns.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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qr <- resolver.DnsMsg{m, nil}
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in = <-qr
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if in.Dns != nil && in.Dns.Answer != nil {
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fmt.Printf("%v\n", in.Dns.Answer[0])
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}
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}
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// Stop the resolver, send it a null mesg
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qr <- resolver.DnsMsg{nil, nil}
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<-qr
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}
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func addresses(qr chan resolver.DnsMsg, name string) []net.IP {
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m := new(dns.Msg)
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m.MsgHdr.Recursion_desired = true //only set this bit
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m.Question = make([]dns.Question, 1)
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var ips []net.IP
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m.Question[0] = dns.Question{os.Args[1], dns.TypeA, dns.ClassINET}
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qr <- resolver.DnsMsg{m, nil}
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in := <-qr
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if in.Dns.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.Dns.Answer {
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ips = append(ips, a.(*dns.RR_A).A)
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}
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m.Question[0] = dns.Question{os.Args[1], dns.TypeAAAA, dns.ClassINET}
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qr <- resolver.DnsMsg{m, nil}
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in = <-qr
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if in.Dns.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.Dns.Answer {
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ips = append(ips, a.(*dns.RR_AAAA).AAAA)
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}
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return ips
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}
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