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middleware/file: fix multiple wildcards (#787)

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Don't hold on to the *first* wildcard you'll find, but keep searching,
there may be one even deeper in the tree.
Also add multi level wildcard test

Fixes #776
This commit is contained in:
Miek Gieben
2017-07-24 14:21:40 -07:00
committed by GitHub
parent 1b7492be6e
commit 07c7ac80e7
2 changed files with 71 additions and 6 deletions
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10
middleware/file/lookup.go
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@@ -76,7 +76,6 @@ func (z *Zone) Lookup(state request.Request, qname string) ([]dns.RR, []dns.RR,
//
// If not found, we check the potential wildcard, and use that for further processing.
// If not found and no wildcard we will process this as an NXDOMAIN response.
//
for {
parts, shot = z.nameFromRight(qname, i)
// We overshot the name, break and check if we previously found something.
@@ -88,12 +87,11 @@ func (z *Zone) Lookup(state request.Request, qname string) ([]dns.RR, []dns.RR,
if !found {
// Apex will always be found, when we are here we can search for a wildcard
// and save the result of that search. So when nothing match, but we have a
// wildcard we should expand the wildcard. There can only be one wildcard,
// so when we found one, we won't look for another.
// wildcard we should expand the wildcard.
if wildElem == nil {
wildcard := replaceWithAsteriskLabel(parts)
wildElem, _ = z.Tree.Search(wildcard)
wildcard := replaceWithAsteriskLabel(parts)
if wild, found := z.Tree.Search(wildcard); found {
wildElem = wild
}
// Keep on searching, because maybe we hit an empty-non-terminal (which aren't