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#! /bin/sh
#
# Fetch the catalog zone '$1' from the server '$2' and print a list of zones.
set -e
catalog="$1"
server="$2"
tempfile="$(mktemp -t catalog)"
trap 'rm $tempfile' 0
if ! dig "$catalog" axfr @"$server" +noall +answer >"$tempfile"; then
printf >&2 '%s: query failed\n' "$0"
exit 1
fi
# Make sure the result has an SOA, otherwise the query failed.
if ! awk <"$tempfile" "
BEGIN {
exitcode=1
}
\$1 == \"$catalog.\" && \$4 == \"SOA\" {
exitcode=0
}
END {
exit exitcode
}
"; then
printf >&2 '%s: no SOA found in zone; transfer failed?\n' "$0"
exit 1
fi
awk <"$tempfile" "
\$1 ~ /zones.$catalog/ && \$4 == \"PTR\" {
zone = \$5
sub(/\\.$/, \"\", zone)
print zone
}"
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