#!/bin/bash

set -e

tmpfile1=$(mktemp -p .)
if [ ! -w $tmpfile1 ] ; then
	echo "Failed to create tmp file" >&2
	exit 0
fi

trap "rm -rf $tmpfile1" EXIT # cleanup if aborted

RULESET="table inet filter { }
include \"$tmpfile1\""

RULESET2="chain inet filter input2 {
	type filter hook input priority filter; policy accept;
	ip saddr 1.2.3.4 tcp dport { 22, 443, 123 } drop
}"

echo "$RULESET2" > $tmpfile1

$NFT -o -f - <<< $RULESET