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.
axfr-get z fn fn.tmp
fn.tmp and fn must be on the same filesystem.
writes the zone serial number as a comment at the top of
It skips the zone transfer,
fn has a serial number matching 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(8) 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 1048576.
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(8), 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(8) selects a random set of 8 for each query.