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#!/bin/bash
#
# A pre-up hook to auto-(re)load the iptables rulesets whenever the
# network is brought up. If the action fails, an alert message is passed
# to syslogd.
#
# Copyright 2013 Guilhem Moulin <guilhem@fripost.org>
#
# Licensed under the GNU GPL version 3 or higher.
#
set -uo pipefail
PATH=/usr/sbin:/usr/bin:/sbin:/bin
# NOTE: syslog starts after networking during the boot process, messages
# won't be logged at boot time.
log="/usr/bin/logger -st firewall"
# Ignore the loopback interface; run the script for ifup only.
[ "$IFACE" != lo -a "$MODE" = start ] || exit 0
# We support only IPv4 and IPv6.
[ "$ADDRFAM" = inet -o "$ADDRFAM" = inet6 ] || exit 0
$log -p syslog.info -- "Loading $ADDRFAM firewall on interface $IFACE."
case "$ADDRFAM" in
inet) iptr=/sbin/iptables-restore; rules=rules.v4;;
inet6)iptr=/sbin/ip6tables-restore; rules=rules.v6;;
esac
rules="/etc/iptables/$rules"
$iptr < $rules 2>&1 | $log -p syslog.err
rv=$?
[ $rv -gt 0 ] && $log -p syslog.alert \
"WARN: Failed to load iptables rulesets; the machine may be unprotected!"
exit $rv
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