46 lines
1.2 KiB
Go
46 lines
1.2 KiB
Go
package main
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// Print the MX records of a domain
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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 DOMAIN\n", os.Args[0])
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os.Exit(1)
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}
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d := new(dns.Conn)
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ser, err := dns.FromFile("/etc/resolv.conf")
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d.RemoteAddr = ser[0]
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m := new(dns.Msg)
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m.Id = dns.Id()
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m.MsgHdr.RecursionDesired = true
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m.Question = make([]dns.Question, 1)
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m.Question[0] = dns.Question{os.Args[1], dns.TypeMX, dns.ClassINET}
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err = d.Dial("udp")
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if err != nil {
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fmt.Printf("*** error: %s\n", err.String())
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os.Exit(1)
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}
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in, err := dns.QuerySimple(d, m)
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if in != nil {
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if in.Rcode != dns.RcodeSuccess {
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fmt.Printf(" *** invalid answer name %s after MX query for %s\n", os.Args[1], os.Args[1])
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os.Exit(1)
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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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fmt.Printf("%v\n", a)
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}
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} else {
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fmt.Printf("*** error: %s\n", err.String())
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}
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}
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