// NSRecords returns NS records from etcd.
func (s *server) NSRecords(q dns.Question, name string) (records []dns.RR, extra []dns.RR, err error) {
path, star := msg.PathWithWildcard(name)
r, err := get(s.client, path, true)
if err != nil {
return nil, nil, err
}
if !r.Node.Dir { // single element
serv := new(msg.Service)
if err := json.Unmarshal([]byte(r.Node.Value), serv); err != nil {
s.config.log.Infof("failed to parse json: %s", err.Error())
return nil, nil, err
}
ip := net.ParseIP(serv.Host)
ttl := s.calculateTtl(r.Node, serv)
serv.Key = r.Node.Key
serv.Ttl = ttl
switch {
case ip == nil:
return nil, nil, fmt.Errorf("NS record must be an IP address")
case ip.To4() != nil:
serv.Host = msg.Domain(serv.Key)
records = append(records, serv.NewNS(q.Name, serv.Host))
extra = append(extra, serv.NewA(serv.Host, ip.To4()))
case ip.To4() == nil:
serv.Host = msg.Domain(serv.Key)
records = append(records, serv.NewNS(q.Name, serv.Host))
extra = append(extra, serv.NewAAAA(serv.Host, ip.To16()))
}
return records, extra, nil
}
sx, err := s.loopNodes(&r.Node.Nodes, strings.Split(msg.Path(name), "/"), star, nil)
if err != nil || len(sx) == 0 {
return nil, nil, err
}
for _, serv := range sx {
ip := net.ParseIP(serv.Host)
switch {
case ip == nil:
return nil, nil, fmt.Errorf("NS record must be an IP address")
case ip.To4() != nil:
serv.Host = msg.Domain(serv.Key)
records = append(records, serv.NewNS(q.Name, serv.Host))
extra = append(extra, serv.NewA(serv.Host, ip.To4()))
case ip.To4() == nil:
serv.Host = msg.Domain(serv.Key)
records = append(records, serv.NewNS(q.Name, serv.Host))
extra = append(extra, serv.NewAAAA(serv.Host, ip.To16()))
}
}
return records, extra, nil
}