Add flatten external plugin - #304
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Signed-off-by: Thomas Dang <14917550+litobro@users.noreply.github.com>
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Adding a new external plugin that implements a form of CNAME flattening that is compatible with apex records.
It is notably different from
rewriteas it only changes the response for A and AAAA records. Allowing other records such as SOA, MX, TXT etc. to be served as intended.Implemented by checking the request NAME as a match for the parameter and that the QType is A or AAAA. Then resolves to the selected DNS Server, creates a reply and overwrites the rr header to provide the original requested NAME for RFC compliance. All other requests fall through to the next plugin.