Reject parsing malformed record data and incomplete DNS response messages #117
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This PR ensures that each record data is valid according to its type, e.g. an
Arecord MUST always have a 4 byte IPv4 address. This should not affect normal operation of compliant DNS servers, but we now ensure that invalid response messages no longer cause any parsing errors on our side. I've added test cases to cover each possible parsing error so that this has 100% test coverage.Builds on top of #115