aports/main/iptables/iptables.initd

#!/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 $

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

extra_commands="check save panic"
extra_started_commands="reload"

iptables_name=${SVCNAME}
case "$iptables_name" in
	iptables|ip6tables) ;;
	*) iptables_name="iptables" ;;
esac

iptables_bin="/usr/sbin/${iptables_name}"
case ${iptables_name} in
	iptables)
		#shellcheck disable=SC2153
		iptables_save="${IPTABLES_SAVE}"
		sysctl_ipfwd=net.ipv4.ip_forward
		;;
	ip6tables)
		iptables_save="${IP6TABLES_SAVE}"
		sysctl_ipfwd=net.ipv6.conf.all.forwarding
		;;
esac

# Add ip netns if configured to run in a netns namespace
if [ -n "$netns" ]; then
	iptables_bin="ip netns exec $netns $iptables_bin"
fi

depend() {
	need localmount # in case IPTABLES_SAVE=/var/...
	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
		${iptables_bin} --wait 5 --table "${table}" --policy "${chain}" "${policy}"
	done
}

get_tables() {
	# shellcheck disable=SC2086
	${iptables_bin}-save | /bin/sed -n 's/^\*//p'
}

checkconfig() {
	if [ ! -f "${iptables_save}" ] ; then
		eerror "Not starting ${iptables_name}.  First create some rules then run:"
		eerror "/etc/init.d/${iptables_name} save"
		return 1
	fi
	return 0
}

start_pre() {
	checkconfig || return 1
	if [ -n "$netns" ] && ! test -e "/run/netns/$netns"; then
		ip netns add "$netns"
	fi
}

start() {
	ebegin "Loading ${iptables_name} state and starting firewall"
	# shellcheck disable=SC2086
	${iptables_bin}-restore ${SAVE_RESTORE_OPTIONS} < "${iptables_save}"
	eend $?
	if yesno "${IPFORWARD}"; then
		ebegin "Enabling forwarding"
		/sbin/sysctl -w "${sysctl_ipfwd}=1" > /dev/null
		eend $?
	fi
}

stop() {
	if yesno "${IPFORWARD}"; then
		ebegin "Disabling forwarding"
		/sbin/sysctl -w "${sysctl_ipfwd}=0" > /dev/null
		eend $?
	fi
	if yesno "${SAVE_ON_STOP}"; then
		save || return 1
	fi
	ebegin "Stopping firewall"
	local a
	for a in $(get_tables) ; do
		set_table_policy "$a" ACCEPT

		${iptables_bin} --wait 5 --flush --table "$a"
		${iptables_bin} --wait 5 --delete-chain --table "$a"
	done
	eend $?
}

reload() {
	checkrules || return 1
	ebegin "Flushing firewall"
	local a
	for a in $(get_tables) ; do
		${iptables_bin} --wait 5 --flush --table "$a"
		${iptables_bin} --wait 5 --delete-chain --table "$a"
	done
	eend $?

	start
}

checkrules() {
	ebegin "Checking rules"
	# shellcheck disable=SC2086
	${iptables_bin}-restore --test ${SAVE_RESTORE_OPTIONS} < "${iptables_save}"
	eend $?
}

check() {
	# Short name for users of init.d script.
	checkrules
}

save() {
	ebegin "Saving ${iptables_name} state"
	checkpath -fm 0600 "${iptables_save}"
	local exitcode tmp

	tmp="$(mktemp)"
	# shellcheck disable=SC2086
	${iptables_bin}-save ${SAVE_RESTORE_OPTIONS} > "${tmp}"
	exitcode=$?
	if [ "$exitcode" -eq 0 ]; then
		# command succeeded, so overwrite
		mv "${tmp}" "${iptables_save}"
	else
		ewarn "${iptables_bin}-save failed!"
		rm -f "${tmp}"
	fi
	eend $exitcode
}

panic() {
	if service_started "${iptables_name}"; then
		rc-service "${iptables_name}" stop
	fi

	local a
	ebegin "Dropping all packets"
	for a in $(get_tables) ; do
		${iptables_bin} --wait 5 --flush --table "$a"
		${iptables_bin} --wait 5 --delete-chain --table "$a"

		set_table_policy "$a" DROP
	done
	eend $?
}