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Increase CNAME lookup limit from 7 to 10 (#7153)

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Signed-off-by: Min Woo Kim <59036289+minportant@users.noreply.github.com>
Signed-off-by: Min Woo Kim <minportant@gmail.com>
Co-authored-by: Min Woo Kim <59036289+minportant@users.noreply.github.com>
This commit is contained in:
Min Woo Kim
2025-03-24 10:38:11 -04:00
committed by GitHub
parent f400f870bf
commit 33d0d05811
1 changed files with 5 additions and 3 deletions
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8
plugin/backend_lookup.go
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@@ -13,6 +13,8 @@ import (
"github.com/miekg/dns" "github.com/miekg/dns"
) )
const maxCnameChainLength = 10
// A returns A records from Backend or an error. // A returns A records from Backend or an error.
func A(ctx context.Context, b ServiceBackend, zone string, state request.Request, previousRecords []dns.RR, opt Options) (records []dns.RR, truncated bool, err error) { func A(ctx context.Context, b ServiceBackend, zone string, state request.Request, previousRecords []dns.RR, opt Options) (records []dns.RR, truncated bool, err error) {
services, err := checkForApex(ctx, b, zone, state, opt) services, err := checkForApex(ctx, b, zone, state, opt)
@@ -34,7 +36,7 @@ func A(ctx context.Context, b ServiceBackend, zone string, state request.Request
} }
newRecord := serv.NewCNAME(state.QName(), serv.Host) newRecord := serv.NewCNAME(state.QName(), serv.Host)
if len(previousRecords) > 7 { if len(previousRecords) > maxCnameChainLength {
// don't add it, and just continue // don't add it, and just continue
continue continue
} }
@@ -108,7 +110,7 @@ func AAAA(ctx context.Context, b ServiceBackend, zone string, state request.Requ
} }
newRecord := serv.NewCNAME(state.QName(), serv.Host) newRecord := serv.NewCNAME(state.QName(), serv.Host)
if len(previousRecords) > 7 { if len(previousRecords) > maxCnameChainLength {
// don't add it, and just continue // don't add it, and just continue
continue continue
} }
@@ -361,7 +363,7 @@ func TXT(ctx context.Context, b ServiceBackend, zone string, state request.Reque
} }
newRecord := serv.NewCNAME(state.QName(), serv.Host) newRecord := serv.NewCNAME(state.QName(), serv.Host)
if len(previousRecords) > 7 { if len(previousRecords) > maxCnameChainLength {
// don't add it, and just continue // don't add it, and just continue
continue continue
} }