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