aports/openrc/iptables/runfile

#!/sbin/openrc-run
# Copyright 1999-2011 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: /var/cvsroot/gentoo-x86/net-firewall/iptables/files/iptables-1.4.11.init,v 1.2 2011/12/04 10:15:59 swegener Exp $
# Modified: caskd <caskd@redxen.eu>

description="IPv4/IPv6 packet filtering and NAT"
description_save="Save firewall state"
description_panic="Drop all packets"
description_reload="Reload configuration"

extra_commands="save panic"
extra_started_commands="reload"

iptables_name=${SVCNAME##*.}
if [ "${iptables_name}" != "iptables" -a "${iptables_name}" != "ip6tables" ] ; then
	iptables_name="iptables"
fi

iptables_bin="/sbin/${iptables_name}"
iptables_dir="${IPTABLES_DIR}"
case ${iptables_name} in
	iptables)  iptables_proc="/proc/net/ip_tables_names";;
	ip6tables) iptables_proc="/proc/net/ip6_tables_names";;
esac

depend() {
	before net
	after sysctl
	use logger
	provide firewall
}

set_table_policy() {
	local chains table=$1 policy=$2
	case ${table} in
		 nat)    chains="PREROUTING POSTROUTING OUTPUT";;
		 mangle) chains="PREROUTING INPUT FORWARD OUTPUT POSTROUTING";;
		 filter) chains="INPUT FORWARD OUTPUT";;
		 *)      chains="";;
	esac
	local chain
	for chain in ${chains} ; do
		 ${iptables_bin} -w 5 -t ${table} -P ${chain} ${policy}
	done
}

checkkernel() {
	if [ ! -e ${iptables_proc} ]; then
		eerror "Your kernel lacks ${iptables_name} support, please load"
		eerror "appropriate modules and try again."
		return 1
	fi
	return 0
}

checkconfig() {
	if [ ! -d "${iptables_dir}" ]; then
		eerror "The iptables directory ${iptables_dir} doesn't exist"
		return 1
	fi
	return 0
}

start() {
	checkconfig || return 1
	restore_file="$(mktemp)"
	einfo "Merging ${iptables_name} rules into ${restore_file}"
	for i in "filter" "mangle" "raw" "nat" "security"; do
		[ -f "${iptables_dir}/$i" ] && cat "${iptables_dir}/$i" "${iptables_dir}/$i-rules"/* "${iptables_dir}/commit" >> "${restore_file}"
	done
	ebegin "Loading ${iptables_name} state and starting firewall"
	${iptables_bin}-restore ${SAVE_RESTORE_OPTIONS} < "${restore_file}"
	eend $?
}

stop() {
	checkkernel || return 1
	ebegin "Stopping firewall"
	local a
	for a in $(cat ${iptables_proc}); do
		set_table_policy $a ACCEPT

		${iptables_bin} -w 5 -F -t $a
		${iptables_bin} -w 5 -X -t $a
	done
	eend $?
}

reload() {
	checkkernel || return 1
	ebegin "Flushing firewall"
	local a
	for a in $(cat ${iptables_proc}); do
		${iptables_bin} -w 5 -F -t $a
		${iptables_bin} -w 5 -X -t $a
	done
	eend $?

	start
}

panic() {
	checkkernel || return 1
	if service_started ${iptables_name}; then
		rc-service ${iptables_name} stop
	fi

	local a
	ebegin "Dropping all packets"
	for a in $(cat ${iptables_proc}); do
		${iptables_bin} -w 5 -F -t $a
		${iptables_bin} -w 5 -X -t $a

		set_table_policy $a DROP
	done
	eend $?
}