ns.go

// GetNameServers returns nameservers configured on the host.
func GetNameServers() ([]string, error) {
  resolvFile := "/etc/resolv.conf"
	f, err := os.Open(resolvFile)
	if err != nil {
		return nil, err
	}
	defer f.Close()

	addrs := []string{}

	scanner := bufio.NewScanner(f)
	for scanner.Scan() {
		line := scanner.Text()
		parts := strings.SplitN(line, " ", 2)
		if len(parts) == 2 && parts[0] == "nameserver" {
			addrs = append(addrs, parts[1])
		}
	}
	if err = scanner.Err(); err != nil {
		return nil, err
	}

	return addrs, err
}