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plugin/etcd+kubernetes: Persist truncated state to client if CNAME lookup response is truncated (#4715)

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Persist the TC bit to client response for truncated CNAME lookups.
Signed-off-by: Chris O'Haver <cohaver@infoblox.com>
This commit is contained in:
Chris O'Haver
2022-02-22 09:38:57 -05:00
committed by GitHub
parent d3a118e1c1
commit 66dc74caeb
5 changed files with 206 additions and 110 deletions
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16
plugin/kubernetes/handler.go
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@@ -22,18 +22,19 @@ func (k Kubernetes) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.M
state.Zone = zone
var (
records []dns.RR
extra []dns.RR
err error
records []dns.RR
extra []dns.RR
truncated bool
err error
)
switch state.QType() {
case dns.TypeA:
records, err = plugin.A(ctx, &k, zone, state, nil, plugin.Options{})
records, truncated, err = plugin.A(ctx, &k, zone, state, nil, plugin.Options{})
case dns.TypeAAAA:
records, err = plugin.AAAA(ctx, &k, zone, state, nil, plugin.Options{})
records, truncated, err = plugin.AAAA(ctx, &k, zone, state, nil, plugin.Options{})
case dns.TypeTXT:
records, err = plugin.TXT(ctx, &k, zone, state, nil, plugin.Options{})
records, truncated, err = plugin.TXT(ctx, &k, zone, state, nil, plugin.Options{})
case dns.TypeCNAME:
records, err = plugin.CNAME(ctx, &k, zone, state, plugin.Options{})
case dns.TypePTR:
@@ -58,7 +59,7 @@ func (k Kubernetes) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.M
// Do a fake A lookup, so we can distinguish between NODATA and NXDOMAIN
fake := state.NewWithQuestion(state.QName(), dns.TypeA)
fake.Zone = state.Zone
_, err = plugin.A(ctx, &k, zone, fake, nil, plugin.Options{})
_, _, err = plugin.A(ctx, &k, zone, fake, nil, plugin.Options{})
}
if k.IsNameError(err) {
@@ -81,6 +82,7 @@ func (k Kubernetes) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.M
m := new(dns.Msg)
m.SetReply(r)
m.Truncated = truncated
m.Authoritative = true
m.Answer = append(m.Answer, records...)
m.Extra = append(m.Extra, extra...)