50 lines
840 B
Go
50 lines
840 B
Go
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package main
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import (
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"flag"
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"fmt"
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"os"
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)
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func main() {
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ns := flag.String("n", "", "nameserver to use")
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v := flag.Bool("v", false, "verbose output")
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flag.Parse()
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if len(flag.Args()) == 0 {
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fmt.Printf("usage: %s [-n nameserver] [-v] name\n", os.Args[0])
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os.Exit(1)
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}
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if *ns == "" {
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if s, err := findNsAddr(); err != nil {
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fmt.Printf("error: %s\n", err)
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os.Exit(1)
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} else {
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*ns = s
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}
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}
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name := flag.Arg(0)
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c, err := dial(*ns)
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if err != nil {
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fmt.Printf("error: %s\n", err)
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os.Exit(1)
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}
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ans, err := c.sendQuery(name)
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if err != nil {
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fmt.Printf("error: %s\n", err)
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os.Exit(1)
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}
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if *v {
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fmt.Printf("nameserver: %s\ntype: %d\nttl: %d\n",
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*ns, ans.Ntype, ans.Ttl)
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}
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fmt.Printf("%s: %d.%d.%d.%d\n", name,
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(ans.Addr>>24)&0xff, (ans.Addr>>16)&0xff, (ans.Addr>>8)&0xff,
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ans.Addr&0xff)
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}
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