#!/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="table inet filter {
	chain ssh {
		type filter hook input priority 0; policy accept;
		tcp dport ssh accept;
	}
}

table inet filter {
	chain input {
		type filter hook input priority 1; policy accept;
	}
}"

echo "$RULESET" > $tmpfile
$NFT -f $tmpfile
if [ $? -ne 0 ] ; then
        echo "E: unable to load good ruleset" >&2
        exit 1
fi