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Ran 23 Aug 2024 01:22PM UTC

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Committed 23 Aug 2024 01:19PM UTC coverage: 58.593% (+0.1%) from 58.48%

Job # 10526468482.1

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github

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web-flow

Commit Message

systemd-resolved handle ESERVFAIL/EREFUSED on single label names (#863)

systemd-resolved will return `ESERVFAIL` or `EREFUSED` by default on
single label domain names. See
https://github.com/systemd/systemd/issues/34101

They've basically labeled this as a non-issue even though it appears to
be in violation of the RFCs for downstream systems being able to support
negative caching. I haven't tested with the suggested
`ResolveUnicastSingleLabel=yes`, but that's off by default so its
unlikely people even knows this exists.

Since systemd is very prevalent these days, we really don't have much of
a choice but to work around their design decisions. This PR implements
this support, but *only* on single label names as it likely isn't valid
otherwise. It also adds test cases to confirm this behavior.

Fixes #852 
Authored-By: Brad House (@bradh352)

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