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add support for EDE 20 (Not Authoritative)

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Extended DNS Error message EDE 20 (Not Authoritative) is now sent when
client request recursion (RD) but the server has recursion disabled.

RFC 8914 mention EDE 20 should also be returned if the client doesn't
have the RD bit set (and recursion is needed) but it doesn't apply for
BIND as BIND would try to resolve from the "deepest" referral in
AUTHORITY section. For example, if the client asks for "www.isc.org/A"
but the server only knows the root domain, it will returns NOERROR but
no answer for "www.isc.og/A", just the list of other servers to ask.
This commit is contained in:
Colin Vidal 2025-03-12 10:28:27 +01:00
parent e66dc07c68
commit 24ffbdcfea
1 changed files with 3 additions and 0 deletions
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3
lib/ns/query.c
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@ -5525,6 +5525,9 @@ ns__query_start(query_ctx_t *qctx) {
if (result != ISC_R_SUCCESS) {
if (result == DNS_R_REFUSED) {
if (WANTRECURSION(qctx->client)) {
dns_ede_add(&qctx->client->edectx,
DNS_EDE_NOTAUTH,
"recursion disabled");
inc_stats(qctx->client,
ns_statscounter_recurserej);
} else {