This is a proof-of-concept of a utility to download DNS zone contents
even when AXFR is disabled on the server, assuming DNSSEC is used.
Optionally it can also verify all digital signature RRs within a
zone against the zone key. If you do not know what DNSSEC is, please
refer to: RFC 2535, RFC 4033, RFC 4034, RFC 4035, "dnssec.net" (lots
of DNSSEC information).
The tool supports both the old DNSSEC according to RFC 2535 (i.e.,
KEY/SIG) and the latest DNSSEC version according to RFC 4033 (i.e.,
DNSKEY/RRSIG).
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