x.go

package main

import (
	"fmt"
	"log"
	"os"

	"github.com/miekg/dns"
)

// host(1) port(2) TTL(3)
func main() {
	fmt.Fprintf(os.Stderr, "%s host port TTL", os.Args[0])
	s := fmt.Sprintf(". %s IN SRV 0 0 %s %s", os.Args[3], os.Args[2], os.Args[1])
	srv, err := dns.NewRR(s)
	if err != nil {
		log.Fatal(err)
	}
	log.Printf("Send HC update for %s", srv)
	m := new(dns.Msg)
	m.SetQuestion("example.com.", dns.TypeSRV)
	m.Extra = []dns.RR{srv}

	resp, err := dns.Exchange(m, ":1053")
	if err != nil {
		log.Fatal(err)
	}
	fmt.Printf("%s\n", resp)
}