my private gentoo overlay
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#!/sbin/openrc-run
# Copyright 1999-2018 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
extra_commands="check save panic"
extra_started_commands="reload"
iptables_lock_wait_time=${IPTABLES_LOCK_WAIT_TIME:-"60"}
iptables_lock_wait_interval=${IPTABLES_LOCK_WAIT_INTERVAL:-"1000"}
iptables_name=${SVCNAME}
case ${iptables_name} in
iptables|ip6tables) ;;
*) iptables_name="iptables" ;;
esac
iptables_bin="/sbin/${iptables_name}"
case ${iptables_name} in
iptables) iptables_proc="/proc/net/ip_tables_names"
iptables_save=${IPTABLES_SAVE};;
ip6tables) iptables_proc="/proc/net/ip6_tables_names"
iptables_save=${IP6TABLES_SAVE};;
esac
depend() {
need localmount #434774
before net
}
set_table_policy() {
local has_errors=0 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 ${iptables_lock_wait_time} --wait-interval ${iptables_lock_wait_interval} -t ${table} -P ${chain} ${policy}
[ $? -ne 0 ] && has_errors=1
done
return ${has_errors}
}
checkkernel() {
if [ ! -e ${iptables_proc} ] ; then
eerror "Your kernel lacks ${iptables_name} support, please load"
eerror "appropriate modules and try again."
return 1
fi
return 0
}
checkconfig() {
if [ -z "${iptables_save}" -o ! -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
}
start() {
ebegin "Loading ${iptables_name} state and starting firewall"
${iptables_bin}-restore --wait ${iptables_lock_wait_time} --wait-interval ${iptables_lock_wait_interval} ${SAVE_RESTORE_OPTIONS} < "${iptables_save}"
eend $?
}
stop_pre() {
checkkernel || return 1
}
stop() {
if [ "${SAVE_ON_STOP}" = "yes" ] ; then
save || return 1
fi
ebegin "Stopping firewall"
local has_errors=0 a
for a in $(cat ${iptables_proc}) ; do
set_table_policy $a ACCEPT
[ $? -ne 0 ] && has_errors=1
${iptables_bin} --wait ${iptables_lock_wait_time} --wait-interval ${iptables_lock_wait_interval} -F -t $a
[ $? -ne 0 ] && has_errors=1
${iptables_bin} --wait ${iptables_lock_wait_time} --wait-interval ${iptables_lock_wait_interval} -X -t $a
[ $? -ne 0 ] && has_errors=1
done
eend ${has_errors}
}
reload() {
checkkernel || return 1
checkrules || return 1
ebegin "Flushing firewall"
local has_errors=0 a
for a in $(cat ${iptables_proc}) ; do
${iptables_bin} --wait ${iptables_lock_wait_time} --wait-interval ${iptables_lock_wait_interval} -F -t $a
[ $? -ne 0 ] && has_errors=1
${iptables_bin} --wait ${iptables_lock_wait_time} --wait-interval ${iptables_lock_wait_interval} -X -t $a
[ $? -ne 0 ] && has_errors=1
done
eend ${has_errors}
start
}
checkrules() {
ebegin "Checking rules"
${iptables_bin}-restore --test ${SAVE_RESTORE_OPTIONS} < "${iptables_save}"
eend $?
}
check() {
# Short name for users of init.d script.
checkrules
}
save() {
ebegin "Saving ${iptables_name} state"
checkpath -q -d "$(dirname "${iptables_save}")"
checkpath -q -m 0600 -f "${iptables_save}"
${iptables_bin}-save ${SAVE_RESTORE_OPTIONS} > "${iptables_save}"
eend $?
}
panic() {
# use iptables autoload capability to load at least all required
# modules and filter table
${iptables_bin} --wait ${iptables_lock_wait_time} --wait-interval ${iptables_lock_wait_interval} -S >/dev/null
if [ $? -ne 0 ] ; then
eerror "${iptables_bin} failed to load"
return 1
fi
if service_started ${iptables_name}; then
rc-service ${iptables_name} stop
fi
local has_errors=0 a
ebegin "Dropping all packets"
for a in $(cat ${iptables_proc}) ; do
${iptables_bin} --wait ${iptables_lock_wait_time} --wait-interval ${iptables_lock_wait_interval} -F -t $a
[ $? -ne 0 ] && has_errors=1
${iptables_bin} --wait ${iptables_lock_wait_time} --wait-interval ${iptables_lock_wait_interval} -X -t $a
[ $? -ne 0 ] && has_errors=1
if [ "${a}" != "nat" ]; then
# The "nat" table is not intended for filtering, the use of DROP is therefore inhibited.
set_table_policy $a DROP
[ $? -ne 0 ] && has_errors=1
fi
done
eend ${has_errors}
}