axfr-get - a DNS zone-transfer client

      It sends a zone-transfer request in DNS-over-TCP format to descriptor
      7, reads the results from descriptor 6, and saves the results in a file.


       Normally axfr-get is run under tcpclient, or using encryption under
       sslclient, which sets up descriptors 6 and 7 as a TCP connection to a
       remote host.

       axfr-get z fn fn.tmp


       axfr-get performs a zone transfer for domain z.  It writes the results
       to fn.tmp in a format that can be used as input to tinydns-data.  If
       the zone transfer completes successfully, axfr-get atomically renames
       fn.tmp as fn.

       fn.tmp and fn must be on the same filesystem.

       axfr-get writes the zone serial number as a comment at the top of
       fn.tmp.  It skips the zone transfer, leaving fn alone, if fn already

       fn has a serial number matching (or above) the zone serial number, and
       both serial numbers are nonzero.

       Zone transfers often include duplicate records.  You should feed the
       axfr-get results through sort -u.

       axfr-get discards all records outside the domain z.  It accepts records
       in child zones, but it marks all child zones as non-authoritative, so
       tinydns will not report those records except as glue.  If you plan to
       merge the axfr-get results for a domain and a child of the same domain,
       creating a file authoritative for both zones, make sure to eliminate
       records in the first output that are within the child zone.

       axfr-get will accept arbitrarily large zone transfers.  To limit the
       maximum file size to 1 megabyte, run axfr-get under softlimit -f


       axfr-get handles BIND's RFC-1034-violating multiple-answers zone-
       transfer format.

       axfr-get does not precisely simulate BIND's handling of *.dom.  Under
       BIND, records for *.dom do not apply to y.dom or anything.y.dom if
       there is a normal record for x.y.dom.  With axfr-get and tinydns, the
       records apply to y.dom and anything.y.dom except x.y.dom.

       axfr-get does not precisely simulate BIND's handling of multiple IP
       addresses for a single name.  When there are more than 8 addresses,
       tinydns selects a random set of 8 for each query.

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