Sueun Cho 9a623cdeed plugin/rewrite: apply rcode rewrites to responses with no records (#8421) ...

* plugin/rewrite: apply rcode rewrites to record-less responses

An rcode rewrite rewrites the message-level RCODE, but the reverter only ran
response rules from inside the per-record loops in WriteMsg. When a response
carries no answer, authority or additional records - for example a bare
SERVFAIL that a downstream plugin returns to a non-EDNS client - none of the
loops iterate, so the rcode rewrite was silently skipped and the client
received the original RCODE.

Apply message-level response rules once when the response has no records, using
a small marker interface that mirrors the existing requestExtraRevertRule
pattern. This fixes the plugin's documented SERVFAIL-to-NOERROR use case for
responses without records.

Signed-off-by: Sueun Cho <sueun.dev@gmail.com>

* plugin/rewrite: apply fallback rcode rewrites for continue

Signed-off-by: Sueun Cho <sueun.dev@gmail.com>

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Signed-off-by: Sueun Cho <sueun.dev@gmail.com>

2026-08-18 11:12:32 +08:00

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