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#!/bin/sh
#
# ipset Start and stop ipset firewall sets
#
# config: /etc/sysconfig/ipset-config
IPSET_BIN=/usr/sbin/ipset
IPSET_CONFIG=/etc/sysconfig/ipset-config
IPSET_DATA_COMPAT=/etc/sysconfig/ipset
IPSET_DATA_COMPAT_BACKUP=${IPSET_DATA_COMPAT}.save
IPSET_DATA_DIR=/etc/sysconfig/ipset.d
IPSET_DATA_DIR_BACKUP=${IPSET_DATA_DIR}.save
IPSET_DATA_SAVED_FLAG=${IPSET_DATA_DIR}/.saved
IPSET_LOCK=/run/ipset.lock
IPSET_RUN=/run/ipset.run
CLEAN_FILES=""
trap "rm -rf \${CLEAN_FILES}" EXIT
[ -x ${IPSET_BIN} ] || { echo "ipset: Cannot execute ${IPSET_BIN}" >&2; exit 5; }
# Source ipset configuration
[ -f ${IPSET_CONFIG} ] && . ${IPSET_CONFIG}
set -f
lock() {
CLEAN_FILES="${CLEAN_FILES} ${IPSET_LOCK}"
until mkdir ${IPSET_LOCK} 2>/dev/null; do :; done
}
save() {
fail=0
# Make backups of existing configuration first, if any
[ -d ${IPSET_DATA_DIR} ] && mv -Tf ${IPSET_DATA_DIR} ${IPSET_DATA_DIR_BACKUP}
[ -f ${IPSET_DATA_COMPAT} ] && mv -Tf ${IPSET_DATA_COMPAT} ${IPSET_DATA_COMPAT_BACKUP}
rm -f ${IPSET_DATA_SAVED_FLAG}
# Save each set in a separate file
mkdir -pm 700 ${IPSET_DATA_DIR}
IFS="
"
for set in $(${IPSET_BIN} list -n -t); do
# Empty name allowed, use ".set" as suffix. 'ipset save' doesn't
# quote set names with spaces: if we have a space in the name,
# work around this by quoting it ourselves in the output.
if expr index "${set}" " " >/dev/null; then
:> "${IPSET_DATA_DIR}/${set}.set"
for line in $(${IPSET_BIN} save "${set}"); do
create=0
echo "${line}" | grep -q "^create " && create=1
if [ $create -eq 1 ]; then
line=${line#create *}
else
line=${line#add *}
fi
line=${line#${set} *}
set="$(echo ${set} | sed 's/"/\\"/'g)"
if [ $create -eq 1 ]; then
echo "create \"${set}\" ${line}" >> "${IPSET_DATA_DIR}/${set}.set"
else
echo "add \"${set}\" ${line}" >> "${IPSET_DATA_DIR}/${set}.set"
fi
done
else
${IPSET_BIN} save "${set}" > "${IPSET_DATA_DIR}/${set}.set" || fail=1
fi
[ -f "${IPSET_DATA_DIR}/${set}.set" ] && chmod 600 "${IPSET_DATA_DIR}/${set}.set"
[ $fail -eq 1 ] && echo "ipset: Cannot save set ${set}" >&2 && unset IFS && return 1
done
touch ${IPSET_DATA_SAVED_FLAG} || { unset IFS; return 1; }
unset IFS
# Done: remove backups
rm -rf ${IPSET_DATA_DIR_BACKUP}
rm -rf ${IPSET_DATA_COMPAT_BACKUP}
return 0
}
load() {
if [ -f ${IPSET_DATA_SAVED_FLAG} ]; then
# If we have a cleanly saved directory with all sets, we can
# delete any left-overs and use it
rm -rf ${IPSET_DATA_DIR_BACKUP}
rm -f ${IPSET_DATA_COMPAT_BACKUP}
else
# If sets weren't cleanly saved, restore from backups
[ -d ${IPSET_DATA_DIR_BACKUP} ] && rm -rf ${IPSET_DATA_DIR} && mv -Tf ${IPSET_DATA_DIR_BACKUP} ${IPSET_DATA_DIR}
[ -f ${IPSET_DATA_COMPAT_BACKUP} ] && rm -f ${IPSET_DATA_COMPAT} && mv -Tf ${IPSET_DATA_COMPAT_BACKUP} ${IPSET_DATA_COMPAT}
fi
if [ ! -d ${IPSET_DATA_DIR} -a ! -f ${IPSET_DATA_COMPAT} ]; then
echo "ipset: No existing configuration available, none loaded"
touch ${IPSET_RUN}
return
fi
# Merge all sets into temporary file
merged="$(mktemp -q /tmp/ipset.XXXXXX)"
CLEAN_FILES="${CLEAN_FILES} ${merged}"
chmod 600 "${merged}"
set +f
if [ -d ${IPSET_DATA_DIR} ]; then
for f in ${IPSET_DATA_DIR}/*; do
[ "${f}" = "${IPSET_DATA_DIR}/*" ] && break
cat "${f}" >> ${merged}
done
fi
set -f
[ -f ${IPSET_DATA_COMPAT} ] && cat ${IPSET_DATA_COMPAT} >> ${merged}
# Drop sets that aren't in saved data, mark conflicts with existing sets
conflicts=""
IFS="
"
for set in $(${IPSET_BIN} list -n -t); do
grep -q "^create ${set} " ${merged} && conflicts="${conflicts}|${set}" && continue
${IPSET_BIN} destroy "${set}" 2>/dev/null
# We can't destroy the set if it's in use, flush it instead
[ $? -ne 0 ] && ${IPSET_BIN} flush "${set}"
done
unset IFS
conflicts="${conflicts#|*}"
# Common case: if we have no conflicts, just restore in one shot
if [ -z "${conflicts}" ]; then
${IPSET_BIN} restore -! < ${merged}
[ $? -ne 0 ] && echo "ipset: Failed to restore configured sets" >&2
rm ${merged}
CLEAN_FILES="${CLEAN_FILES%* ${merged}}"
touch ${IPSET_RUN}
return
fi
# Find a salt for md5sum that makes names of saved sets unique
salt=0
while true; do
unique=1
IFS="
"
for set in $(${IPSET_BIN} list -n -t); do
grep -q "^create $(echo ${salt}${set} | md5sum | head -c31) " ${merged}
[ $? -eq 0 ] && unique=0 && break
done
unset IFS
[ ${unique} -eq 1 ] && break
salt=$((salt + 1))
done
# Add sets, mangling names for conflicting sets
awk '/^(add|create) ('"${conflicts}"')/ { printf "%s ",$1; system("echo '${salt}'" $2 " | md5sum | head -c31"); $1=""; $2=""; print; next} {print}' ${merged} | ${IPSET_BIN} restore -!
[ $? -ne 0 ] && echo "ipset: Failed to restore configured sets" >&2
# Swap and delete old sets
IFS='|'
for set in ${conflicts}; do
mangled="$(echo ${salt}${set} | md5sum | head -c31)"
${IPSET_BIN} swap "${set}" "${mangled}" 2>/dev/null
if [ $? -ne 0 ]; then
# This fails if set types are different: try to destroy
# existing set
${IPSET_BIN} destroy "${set}" 2>/dev/null
if [ $? -ne 0 ]; then
# Conflicting set is in use, we can only warn
# and flush the existing set
echo "ipset: Cannot load set \"${set}\", set with same name and conflicting type in use" >&2
${IPSET_BIN} flush "${set}"
${IPSET_BIN} destroy "${mangled}"
else
${IPSET_BIN} rename "${mangled}" "${set}"
fi
else
${IPSET_BIN} destroy "${mangled}"
fi
done
unset IFS
rm ${merged}
CLEAN_FILES="${CLEAN_FILES%* ${merged}}"
touch ${IPSET_RUN}
}
cleanup() {
${IPSET_BIN} flush || echo "ipset: Failed to flush sets" >&2
# Try to destroy all sets at once. This will fail if some are in use,
# destroy all the other ones in that case
${IPSET_BIN} destroy 2>/dev/null && return
IFS="
"
for set in $(${IPSET_BIN} list -n -t); do
${IPSET_BIN} destroy "${set}" 2>/dev/null
done
unset IFS
}
stop() {
[ -f ${IPSET_RUN} ] || { echo "ipset: not running"; return 0; }
[ "${IPSET_SAVE_ON_STOP}" = "yes" ] && { save || echo "ipset: Failed to save sets"; }
# Nothing to stop if the ip_set module is not loaded
lsmod | grep -q "^ip_set " || { echo "ipset: not running"; rm ${IPSET_RUN}; return 0; }
# If the xt_set module is in use, then iptables is using ipset, so
# refuse to stop the service
mod="$(lsmod | grep ^xt_set)"
if [ $? -eq 0 ]; then
if [ "$(echo ${mod} | tr -s ' ' | cut -d' ' -f3)" != "0" ]; then
echo "ipset: Current iptables configuration requires ipset" >&2 && return 1
fi
fi
cleanup
rm ${IPSET_RUN}
return 0
}
lock
case "$1" in
start)
load
;;
stop)
stop
;;
reload)
cleanup
load
;;
save)
save
;;
*)
echo "Usage: $0 {start|stop|reload|save}" >&2
exit 1
esac
exit $?