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Better command-line usage message.

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This commit is contained in:
David Fifield
2020-04-18 14:23:11 -06:00
parent 6633ee8b8d
commit cfbbc9aaee
1 changed files with 6 additions and 2 deletions
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dnstt-server/main.go
+6 -2
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@@ -310,11 +310,15 @@ func run(domain dns.Name, upstream net.Addr, udpAddr string) error {
func main() {
var udpAddr string
flag.StringVar(&udpAddr, "udp", "", "UDP port to listen on")
flag.Usage = func() {
fmt.Fprintf(flag.CommandLine.Output(), "Usage: %s -udp ADDR DOMAIN UPSTREAMADDR\n", os.Args[0])
flag.PrintDefaults()
}
flag.StringVar(&udpAddr, "udp", "", "UDP address to listen on")
flag.Parse()
if flag.NArg() != 2 {
fmt.Fprintf(os.Stderr, "usage: %s -udp ADDR DOMAIN UPSTREAMADDR\n", os.Args[0])
flag.Usage()
os.Exit(1)
}
domain, err := dns.ParseName(flag.Arg(0))