libnetwork: ServeDNS(): don't panic on unsupported query types
This was added in but resulted
in a panic if the embedded DNS had to handle an unsupported query-type,
such as ANY.
This patch adds a debug log for this case (to better describe how it's
handled.
@@ -384,7 +384,8 @@ func (r *resolver) ServeDNS(w dns.ResponseWriter, query *dns.Msg) {
case dns.TypeSRV:
resp, err = r.handleSRVQuery(name, query)
default:
- panic("error")
+ queryType := dns.TypeToString[query.Question[0].Qtype]
+ logrus.Debugf("[resolver] query type %s is not supported by the embedded DNS and will be forwarded to external DNS", queryType)
}
if err != nil {
