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middleware/file: fix DS handling (#344)

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The DS record is handled specially in the server ServeDNS mux, but there
was no code that actually called the correct middleware handler chain
when encountering a DS.

This PR fixes that behavoir, additonal bugs has been files to look into
how we are handling delegation (secure and non-secure ones).
This commit is contained in:
Miek Gieben
2016-10-19 17:46:03 +01:00
committed by GitHub
parent ad7e78ec31
commit 4f36e63a05
4 changed files with 227 additions and 0 deletions
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18
core/dnsserver/server.go
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@@ -177,6 +177,8 @@ func (s *Server) ServeDNS(w dns.ResponseWriter, r *dns.Msg) {
off, end := 0, false
ctx := context.Background()
var dshandler *Config
for {
l := len(q[off:])
for i := 0; i < l; i++ {
@@ -195,12 +197,28 @@ func (s *Server) ServeDNS(w dns.ResponseWriter, r *dns.Msg) {
}
return
}
// The type is DS, keep the handler, but keep on searching as maybe we are serving
// the parent as well and the DS should be routed to it - this will probably *misroute* DS
// queries to a possibly grand parent, but there is no way for us to know at this point
// if there is an actually delegation from grandparent -> parent -> zone.
// In all fairness: direct DS queries should not be needed.
dshandler = h
}
off, end = dns.NextLabel(q, off)
if end {
break
}
}
if dshandler != nil {
// DS request, and we found a zone, use the handler for the query
rcode, _ := dshandler.middlewareChain.ServeDNS(ctx, w, r)
if rcodeNoClientWrite(rcode) {
DefaultErrorFunc(w, r, rcode)
}
return
}
// Wildcard match, if we have found nothing try the root zone as a last resort.
if h, ok := s.zones["."]; ok {
rcode, _ := h.middlewareChain.ServeDNS(ctx, w, r)