DNSLO

DNS is SLOw, so cache it on LOopback

NIH

I always want a single file Python script to run on loopback as a caching DNS resolver. Because DDoS from IoT broke the Internet.

It caches A/AAAA records using oldskool Sqlite3. Other types are pass-thru
Always returns the last-known good DNS record first. (In case o)
When TTL is met, a background task will update the record automatically. To achieve zero lag resolving. Everything is queried from SQLite3 directly. (Well of course except the first request.)
It keeps a track of history DNS changes

Goals that might be planned to add to to-do list in the ∞ future or never:

AS binding and EDNS extension
DNSCrypt or DNSCurve or other complex shit
sort records by network RTT
HTTP DNS, why is it even a thing?
multi, global DNS resolver aggregation
Replace system DNS cache automatically
Grab DHCP DNS, ISP default on the fly
Distinguish well-known CDNs for extra speed-ups
Really trying to ping or 80/443 TCP connect the results for fastest host.

License

GPLv3. yeah suck it bitches.