Support CAA record type #20
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The 65 HTTPS record in particular is now frequently requested by Chrome and without this mapping defined an error is thrown.
If an error is thrown while creating a Request object, such as when an unknown resource record type is requested, there's no way for the client to handle it. The error is thrown before the request is emitted and the handler is called. This change leaves the underlying error throwing as it is but catches the error in the server and emits them instead.
Any errors that might be emitted from the socket rather than the server can't be handled by the client. This listens for errors on the connection (and request and response) and emits them from the server. In order to do that, the Request and Response objects (which inherit from DNSMessage) must actually be EventEmitters. They often call emit, but only in rare code paths. Those code paths would throw because emit wasn't a function.
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Adds CAA record support to DNSD. This will help with CA validation.
The record seems to be an 8-bit flag, then an 8-bit length of the type, followed by the payload (type and value).
Values generated by this have been validated by using https://sslmate.com/caa/ and
dig 9.9.7-P3Usage:
To get
0 issuewild "digicert.com"to show up on your DNS records, you should use:Fixes #19