Emit EDE 33 (Negative Trust Anchor) when NTA is in effect - #1470
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This covers responses that are covered by a `domain-insecure` or an `insecure-lan-zones` entry, or during runtime using `unbound-control` relevant subcommands. The idea is for the client to know this is an operator-driven action to disabled validation on a given name. This implements draft-farrokhi-dnsop-ede-nta
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This implements responding with EDE 33 (Negative Trust Anchor) when the resolver returns an answer covered by an NTA. The behavior is specified in draft-farrokhi-dnsop-ede-nta and IANA has allocated EDE 33 for this purpose.
Affected responses are those whose names fall under a
domain-insecureorinsecure-lan-zonesentry, or under an NTA added at runtime throughunbound-control insecure_add,forward_add +i, orstub_add +i. The signal let clients know that an operator-driven validation bypass is in effect.