dnsdist: Handle header-only responses, handle Refused as Servfail in the cache #4812
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@rygl reported that unbound at least sends `Refused` responses containing only the DNS header.
The check is done before inserting the response into the cache, but it feels safer to check it again before passing it to `memcpy()`. We check that the cached response is larger than `sizeof(dnsheader) + qname` afterwards, but the previous commit moved the header copy before that check.
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Short description
@rygl reported that
UnboundsendsRefusedresponses containing only the DNS header, and that we didn't parse these correctly.This patch also makes the packet cache use the same custom
TTLforRefusedresponses than forServFailones.Checklist
I have: