Add secondary support

Allow specifying a primary server and retrieve the zone's content.

Add tests and an Expired bool to zone struct, to stop server zones

that are expired. The zone is retrieved on Startup, no updates of

changed content are done. We also don't respond to notifies yet.

1 files changed, 6 insertions, 0 deletions

diff --git a/middleware/file/file.go b/middleware/file/file.go
index c005b41cc..caf0c5fbc 100644
--- a/middleware/file/file.go
+++ b/middleware/file/file.go
@@ -33,6 +33,12 @@ func (f File) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (i
 	if !ok {
 		return f.Next.ServeDNS(ctx, w, r)
 	}
+	if z == nil {
+		return dns.RcodeServerFailure, nil
+	}
+	if z.Expired != nil && *z.Expired {
+		return dns.RcodeServerFailure, nil
+	}
 
 	if state.Proto() != "udp" && state.QType() == dns.TypeAXFR {
 		xfr := Xfr{z}