happyDomain/checker-ptr
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  • v0.2.0 ab1595d85f

    checker: implement ShareKey to mutualise reverse-DNS lookups across targets
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    nemunaire released this 2026-06-18 07:17:04 +00:00 | 0 commits to master since this release

    The reverse-DNS observation (zone location, authoritative NS, the PTR RRset,
    and the forward-confirm of the effective target) is determined entirely by the
    reverse-arpa owner name — i.e. the IP being asked about — never by which
    forward domain triggered the check. Implement sdk.ObservationSharer so the host
    runs the PTR + FCrDNS lookups once and serves every target that interrogates
    the same reverse name, instead of re-querying per record.

    The share key derives from the owner name and folds in the declared target and
    TTL: these are part of the observation and can change it — when no PTR is
    published the effective target (and therefore its forward-confirm) falls back
    to the declared value. ShareKey stays a pure function of opts (no network) per
    the contract. An empty owner yields "" so the host falls back to per-target
    caching.

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