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128 lines
4.1 KiB
128 lines
4.1 KiB
5 months ago
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#!/sbin/openrc-run
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# Copyright 1999-2013 Gentoo Foundation
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# Distributed under the terms of the GNU General Public License v2
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extra_commands="save"
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extra_started_commands="reload"
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IPSET_SAVE=${IPSET_SAVE:-/var/lib/ipset/rules-save}
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ipset_name_regex='^[-_.a-zA-Z0-9]+$'
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depend() {
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before iptables ip6tables
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}
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checkconfig() {
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if [ ! -f "${IPSET_SAVE}" ] ; then
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eerror "Not starting ${SVCNAME}. First create some rules then run:"
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eerror "/etc/init.d/${SVCNAME} save"
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return 1
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fi
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return 0
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}
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start() {
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checkconfig || return 1
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ebegin "Loading ipset session"
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ipset restore < "${IPSET_SAVE}"
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eend $?
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}
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stop() {
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# check if there are any references to current sets
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if ! ipset list | gawk '
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($1 == "References:") { refcnt += $2 }
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($1 == "Type:" && $2 == "list:set") { set = 1 }
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(scan) { if ($0 != "") setcnt++; else { scan = 0; set = 0 } }
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(set && $1 == "Members:") {scan = 1}
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END { if ((refcnt - setcnt) > 0) exit 1 }
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'; then
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eerror "ipset is in use, can't stop"
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return 1
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fi
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if [ "${SAVE_ON_STOP}" = "yes" ] ; then
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save || return 1
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fi
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ebegin "Removing kernel IP sets"
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ipset flush
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ipset destroy
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eend $?
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}
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reload() {
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ebegin "Reloading ipsets"
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# Loading sets from a save file is only additive (there is no
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# automatic flushing or replacing). And, we can not remove sets
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# that are currently used in existing iptables rules.
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#
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# Instead, we create new temp sets for any set that is already
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# in use, and then atomically swap them into place.
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#
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# XXX: This does not clean out previously used ipsets that are
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# not in the new saved policy--it can't, because they may still
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# be referenced in the current iptables rules.
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# Build a list of all currently used sets (if any);
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# also make sure all sets' names are fully supported.
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IFS_O=$IFS
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NEWLINE='
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'
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local IFS=$NEWLINE
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for running_ipset in $(ipset -n list) ; do
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if ! echo "${running_ipset}" | grep -q -E "${ipset_name_regex}" ; then
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eend 1 "Running set name ('$running_ipset') does not match regex '${ipset_name_regex}'"
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return 1
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fi
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running_ipset_list="$running_ipset_list $running_ipset"
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done
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IFS=$IFS_O
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running_ipset_list="${running_ipset_list# }"
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# Check the configured suffix, and make sure there are no collisions
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if test -z "${TEMP_SUFFIX}" ; then
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eend 1 "TEMP_SUFFIX cannot be empty"
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return 1
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fi
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# Make sure TEMP_SUFFIX uses only known-safe characters.
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if ! echo "${TEMP_SUFFIX}" | grep -q -E "${ipset_name_regex}" ; then
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eend 1 "TEMP_SUFFIX pattern ('$TEMP_SUFFIX') does not match regex '${ipset_name_regex}'"
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return 1
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fi
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# We don't block ., but it must be escaped.
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temp_suffix_regex=$(echo "${TEMP_SUFFIX}" | sed 's/\./\\./g')
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if echo "$running_ipset_list" | grep -q -E "${temp_suffix_regex}( |$)" ; then
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eend 1 "Existing set(s) match TEMP_SUFFIX pattern ('${TEMP_SUFFIX}'), cannot continue"
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return 1
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fi
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# Build a regular expression that matches those set names.
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running_ipset_list_regex="$(echo "$running_ipset_list" | tr -s ' ' '|' )"
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# Load up sets from the save file, but rename any set that already
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# exists to a temporary name that we will swap later.
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if ! cat ${IPSET_SAVE} | sed -r "s/^(create|add) (${running_ipset_list_regex}) /\1 \2${temp_suffix_regex} /" | ipset restore ; then
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eend $? "Failed to load new ipsets"
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fi
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# Now for every set name that currently exists, atomically swap it
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# with the temporary new one we created, and then destroy the old set.
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for ipset_name in ${running_ipset_list} ; do
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ipset swap "${ipset_name}" "${ipset_name}${TEMP_SUFFIX}" || eend $? "Failed to swap in new ipset $ipset_name"
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ipset destroy "${ipset_name}${TEMP_SUFFIX}" || eend $? "Failed to delete obsolete ipset ${ipset_name}${TEMP_SUFFIX}"
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done
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eend 0
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}
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save() {
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ebegin "Saving ipset session"
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checkpath --file --mode 0600 "${IPSET_SAVE}"
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ipset -output save list > "${IPSET_SAVE}"
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eend $?
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}
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