Listen on all global unicast and loopback addresses if --interface is…

…n't specified

geodns.go

@@ -20,7 +20,7 @@ var qCounter uint64 = 0
 
 var (
  flagconfig = flag.String("config", "./dns/", "directory of zone files")
- flagint  = flag.String("interface", "*", "set the listener address")
+ flaginter = flag.String("interface", "*", "set the listener address")
  flagport = flag.String("port", "53", "default port number")
  flaglog = flag.Bool("log", false, "be more verbose")
  flagrun = flag.Bool("run", false, "run server")
@@ -60,6 +60,23 @@ func main() {
  }()
  }
 
+ if *flaginter == "*" {
+ addrs, _ := net.InterfaceAddrs()
+ ips := make([]string, 0)
+ for _, addr := range addrs {
+ log.Println("I", addr)
+ ip, _, err := net.ParseCIDR(addr.String())
+ if err != nil {
+ continue
+ }
+ if !(ip.IsLoopback() || ip.IsGlobalUnicast()) {
+ continue
+ }
+ ips = append(ips, ip.String())
+ }
+ *flaginter = strings.Join(ips, ",")
+ }
+
  go monitor()
 
  dirName := *flagconfig
@@ -69,7 +86,7 @@ func main() {
  setupPgeodnsZone(Zones)
 
  go configReader(dirName, Zones)
- for _, host := range strings.Split(*flagint, ",") {
+ for _, host := range strings.Split(*flaginter, ",") {
  ip, port, err := net.SplitHostPort(host)
  if err != nil {
  switch {