eventdns and caching of NXDOMAIN
Local DNS proxy might not include the SOA record (in case of NXDOMAIN) when it is resolving for tor, but faking a SOA record should be easy... maybe a config option or #define for the TTL of cached NXDOMAIN?
Now in case of NXDOMAIN, eventdns does not include Authority RR with SOA record, so clients querying tor can not cache the NXDOMAIN. They just keep on querying the same thing again and again.
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