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plugin/file: fix wildcard CNAME answer (#4828)

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* plugin/file: fix wildcard CNAME answer

Signed-off-by: Yoshida <ykhr53@yokohei.com>

* plugin/file: fix synthesized CNAME answer

Signed-off-by: Yoshida <ykhr53@yokohei.com>
This commit is contained in:
Kohei Yoshida
2021-09-08 04:21:11 +09:00
committed by GitHub
parent 4b0e6a173c
commit 5f6baf2973
2 changed files with 41 additions and 3 deletions
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19
plugin/file/lookup.go
View File

@@ -115,8 +115,21 @@ func (z *Zone) Lookup(ctx context.Context, state request.Request, qname string)
// Only one DNAME is allowed per name. We just pick the first one to synthesize from.
dname := dnamerrs[0]
if cname := synthesizeCNAME(state.Name(), dname.(*dns.DNAME)); cname != nil {
ctx = context.WithValue(ctx, dnsserver.LoopKey{}, loop+1)
answer, ns, extra, rcode := z.externalLookup(ctx, state, elem, []dns.RR{cname})
var (
answer, ns, extra []dns.RR
rcode Result
)
// We don't need to chase CNAME chain for synthesized CNAME
if qtype == dns.TypeCNAME {
answer = []dns.RR{cname}
ns = ap.ns(do)
extra = nil
rcode = Success
} else {
ctx = context.WithValue(ctx, dnsserver.LoopKey{}, loop+1)
answer, ns, extra, rcode = z.externalLookup(ctx, state, elem, []dns.RR{cname})
}
if do {
sigs := elem.Type(dns.TypeRRSIG)
@@ -203,7 +216,7 @@ func (z *Zone) Lookup(ctx context.Context, state request.Request, qname string)
if wildElem != nil {
auth := ap.ns(do)
if rrs := wildElem.TypeForWildcard(dns.TypeCNAME, qname); len(rrs) > 0 {
if rrs := wildElem.TypeForWildcard(dns.TypeCNAME, qname); len(rrs) > 0 && qtype != dns.TypeCNAME {
ctx = context.WithValue(ctx, dnsserver.LoopKey{}, loop+1)
return z.externalLookup(ctx, state, wildElem, rrs)
}

25
plugin/file/lookup_test.go
View File

@@ -95,6 +95,28 @@ var dnsTestCases = []test.Case{
},
Ns: miekAuth,
},
{
Qname: "asterisk.x.miek.nl.", Qtype: dns.TypeCNAME,
Answer: []dns.RR{
test.CNAME("asterisk.x.miek.nl. 1800 IN CNAME www.miek.nl."),
},
Ns: miekAuth,
},
{
Qname: "asterisk.y.miek.nl.", Qtype: dns.TypeA,
Answer: []dns.RR{
test.A("asterisk.y.miek.nl. 1800 IN A 139.162.196.78"),
},
Ns: miekAuth,
},
{
Qname: "foo.dname.miek.nl.", Qtype: dns.TypeCNAME,
Answer: []dns.RR{
test.DNAME("dname.miek.nl. 1800 IN DNAME x.miek.nl."),
test.CNAME("foo.dname.miek.nl. 1800 IN CNAME foo.x.miek.nl."),
},
Ns: miekAuth,
},
}
const (
@@ -191,6 +213,9 @@ a IN A 139.162.196.78
IN AAAA 2a01:7e00::f03c:91ff:fef1:6735
www IN CNAME a
archive IN CNAME a
*.x IN CNAME www
*.y IN A 139.162.196.78
dname IN DNAME x
srv IN SRV 10 10 8080 a.miek.nl.
mx IN MX 10 a.miek.nl.`