May 26, 2018

Perl5 preprocessor for normalising a zone file

The NetDNSZoneParser should be considered a preprocessor that “normalizes” a zonefile.

It will read a zonefile in a format conforming to the relevant RFCs with the addition of BIND’s GENERATE directive from disk and will write fully specified resource records RRs to a filehandle. Whereby

  • All comments are stripped
  • There is one RR per line
  • Each RR is fully expanded i.e. all domain names are fully qualified canonicalised and the CLASS and TTLs are specified.
  • Some RRs may be ‘stripped’ from the source or otherwise processed. For details see the ‘read’ method.

Note that this module does not have a notion of what constitutes a valid zone, it only parses. For example, the parser will happilly parse RRs with ownernames that are below in another zone because a NS RR elsewhere in the zone.

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