#!/bin/bash

set -e

tmpfile=$(mktemp)

if [ ! -w $tmpfile ] ; then

        echo "Failed to create tmp file" >&2

        exit 0

fi

trap "rm -rf $tmpfile" EXIT # cleanup if aborted

RULESET="include \"$tmpfile\""

echo "$RULESET" > $tmpfile

$NFT -f $tmpfile 2>/dev/null || exit 0

echo "E: endless include loop" >&2

exit 1