40 lines
813 B
Go
40 lines
813 B
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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"fmt"
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"os"
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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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// Error checking
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config, _ := dns.ClientConfigFromFile("/etc/resolv.conf")
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c := dns.NewClient()
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m := new(dns.Msg)
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m.SetQuestion(os.Args[1], dns.TypeMX)
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m.MsgHdr.RecursionDesired = true
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// Simple sync query, nothing fancy
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r, err := c.Exchange(m, config.Servers[0] + ":" + config.Port)
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if err != nil {
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fmt.Printf("%s\n", err.Error())
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os.Exit(1)
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}
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if r.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 r.Answer {
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fmt.Printf("%v\n", a)
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}
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}
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