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462 lines
13 KiB
462 lines
13 KiB
#!/bin/sh
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# dns based ad/abuse domain blocking
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# written by Dirk Brenken (dev@brenken.org)
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# This is free software, licensed under the GNU General Public License v3.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# set initial defaults
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#
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LC_ALL=C
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PATH="/usr/sbin:/usr/bin:/sbin:/bin"
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adb_ver="2.0.2"
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adb_enabled=1
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adb_debug=0
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adb_whitelist="/etc/adblock/adblock.whitelist"
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adb_whitelist_rset="\$1 ~/^([A-Za-z0-9_-]+\.){1,}[A-Za-z]+/{print tolower(\"^\"\$1\"\\\|[.]\"\$1)}"
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adb_dns="dnsmasq"
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adb_dnsdir="/tmp/dnsmasq.d"
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adb_dnshidedir="${adb_dnsdir}/.adb_hidden"
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adb_dnsprefix="adb_list"
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adb_dnsformat="awk '{print \"local=/\"\$0\"/\"}'"
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adb_fetch="/usr/bin/wget"
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adb_fetchparm="--no-config --quiet --tries=1 --no-cache --no-cookies --max-redirect=0 --timeout=5 --no-check-certificate -O"
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# f_envload: load adblock environment
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#
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f_envload()
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{
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# source in system library
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#
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if [ -r "/lib/functions.sh" ]
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then
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. "/lib/functions.sh"
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else
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f_log "error" "status ::: system library not found"
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fi
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# parse global section by callback
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#
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config_cb()
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{
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local type="${1}"
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if [ "${type}" = "adblock" ]
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then
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option_cb()
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{
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local option="${1}"
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local value="${2}"
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eval "${option}=\"${value}\""
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}
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else
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reset_cb
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fi
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}
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# parse 'service' and 'source' sections
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#
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parse_config()
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{
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local value opt section="${1}" options="enabled adb_dir adb_src adb_src_rset adb_src_cat"
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if [ "${section}" != "backup" ]
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then
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eval "adb_sources=\"${adb_sources} ${section}\""
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fi
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for opt in ${options}
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do
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config_get value "${section}" "${opt}"
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if [ -n "${value}" ]
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then
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eval "${opt}_${section}=\"${value}\""
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fi
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done
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}
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# load adblock config
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#
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config_load adblock
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config_foreach parse_config service
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config_foreach parse_config source
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}
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# f_envcheck: check/set environment prerequisites
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#
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f_envcheck()
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{
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# check 'enabled' option
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#
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if [ "${adb_enabled}" != "1" ]
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then
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if [ "$(ls -dA "${adb_dnsdir}/${adb_dnsprefix}"* >/dev/null 2>&1)" ]
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then
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f_rmdns
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f_dnsrestart
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fi
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f_log "info " "status ::: adblock is currently disabled, please set adb_enabled to '1' to use this service"
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exit 0
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fi
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# check fetch utility
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#
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if [ -z "${adb_fetch}" ] || [ ! -f "${adb_fetch}" ]
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then
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f_log "error" "status ::: no download utility with ssl support found/configured"
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fi
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# create dns hideout directory
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#
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if [ ! -d "${adb_dnshidedir}" ]
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then
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mkdir -p -m 660 "${adb_dnshidedir}"
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else
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rm -f "${adb_dnshidedir}/${adb_dnsprefix}"*
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fi
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# create adblock temp file/directory
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#
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adb_tmpload="$(mktemp -tu)"
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adb_tmpfile="$(mktemp -tu)"
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adb_tmpdir="$(mktemp -p /tmp -d)"
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# prepare whitelist entries
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#
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if [ -s "${adb_whitelist}" ]
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then
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awk "${adb_whitelist_rset}" "${adb_whitelist}" > "${adb_tmpdir}/tmp.whitelist"
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fi
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# get system information
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#
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adb_sysver="$(ubus -S call system board | jsonfilter -e '@.release.description')"
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}
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# f_rmtemp: remove temporary files & directories
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#
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f_rmtemp()
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{
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rm -f "${adb_tmpload}"
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rm -f "${adb_tmpfile}"
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rm -rf "${adb_tmpdir}"
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}
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# f_rmdns: remove dns related files & directories
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#
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f_rmdns()
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{
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rm -f "${adb_dnsdir}/${adb_dnsprefix}"*
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rm -f "${adb_dir_backup}/${adb_dnsprefix}"*.gz
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rm -rf "${adb_dnshidedir}"
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ubus call service delete "{\"name\":\"adblock_stats\",\"instances\":\"stats\"}"
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}
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# f_dnsrestart: restart the dns server
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#
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f_dnsrestart()
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{
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local cnt=0
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dns_running="false"
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sync
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killall -q -TERM "${adb_dns}"
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while [ ${cnt} -le 10 ]
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do
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dns_running="$(ubus -S call service list '{"name":"dnsmasq"}' | jsonfilter -l 1 -e '@.dnsmasq.instances.*.running')"
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if [ "${dns_running}" = "true" ]
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then
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return 0
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fi
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cnt=$((cnt+1))
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sleep 1
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done
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/etc/init.d/"${adb_dns}" restart
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sleep 1
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}
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# f_list: backup/restore/remove block lists
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#
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f_list()
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{
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local mode="${1}"
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if [ "${enabled_backup}" = "1" ] && [ -d "${adb_dir_backup}" ]
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then
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case "${mode}" in
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backup)
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gzip -cf "${adb_tmpfile}" > "${adb_dir_backup}/${adb_dnsprefix}.${src_name}.gz"
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;;
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restore)
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rm -f "${adb_dnsdir}/${adb_dnsprefix}.${src_name}"
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if [ -f "${adb_dir_backup}/${adb_dnsprefix}.${src_name}.gz" ]
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then
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gunzip -cf "${adb_dir_backup}/${adb_dnsprefix}.${src_name}.gz" > "${adb_tmpfile}"
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fi
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;;
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remove)
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rm -f "${adb_dnsdir}/${adb_dnsprefix}.${src_name}"
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if [ -f "${adb_dir_backup}/${adb_dnsprefix}.${src_name}.gz" ]
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then
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rm -f "${adb_dir_backup}/${adb_dnsprefix}.${src_name}.gz"
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fi
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;;
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esac
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fi
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}
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# f_switch: suspend/resume adblock processing
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#
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f_switch()
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{
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if [ -d "${adb_dnshidedir}" ]
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then
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local source target status mode="${1}"
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local dns_active="$(find "${adb_dnsdir}" -maxdepth 1 -type f -name "${adb_dnsprefix}*" -print)"
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local dns_passive="$(find "${adb_dnshidedir}" -maxdepth 1 -type f -name "${adb_dnsprefix}*" -print)"
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if [ -n "${dns_active}" ] && [ "${mode}" = "suspend" ]
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then
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source="${adb_dnsdir}/${adb_dnsprefix}"
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target="${adb_dnshidedir}"
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status="suspended"
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elif [ -n "${dns_passive}" ] && [ "${mode}" = "resume" ]
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then
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source="${adb_dnshidedir}/${adb_dnsprefix}"
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target="${adb_dnsdir}"
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status="resumed"
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fi
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if [ -n "${status}" ]
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then
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mv -f "${source}"* "${target}"
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f_dnsrestart
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f_log "info " "status ::: adblock processing ${status}"
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fi
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fi
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}
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# f_query: query block lists for certain (sub-)domains
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#
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f_query()
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{
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local search result cnt
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local domain="${1}"
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local tld="${domain#*.}"
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local dns_active="$(find "${adb_dnsdir}" -maxdepth 1 -type f -name "${adb_dnsprefix}*" -print)"
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if [ -z "${dns_active}" ]
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then
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printf "%s\n" ":: no active block lists found, please start adblock first"
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elif [ -z "${domain}" ] || [ "${domain}" = "${tld}" ]
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then
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printf "%s\n" ":: invalid domain input, please submit a specific (sub-)domain, i.e. 'www.abc.xyz'"
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else
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while [ "${domain}" != "${tld}" ]
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do
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search="${domain//./\.}"
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result="$(grep -Hm 1 "[/\.]${search}/" "${adb_dnsdir}/${adb_dnsprefix}"* | awk -F ':|/' '{print " "$4"\t: "$6}')"
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cnt="$(grep -hc "[/\.]${search}/" "${adb_dnsdir}/${adb_dnsprefix}"* | awk '{sum += $1} END {printf sum}')"
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printf "%s\n" ":: distinct results for domain '${domain}' (overall ${cnt})"
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if [ -z "${result}" ]
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then
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printf "%s\n" " no matches in active block lists"
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else
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printf "%s\n" "${result}"
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fi
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domain="${tld}"
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tld="${domain#*.}"
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done
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fi
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}
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# f_log: write to syslog, exit on error
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#
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f_log()
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{
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local class="${1}"
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local log_msg="${2}"
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if [ -n "${log_msg}" ] && ([ "${class}" != "debug" ] || [ ${adb_debug} -eq 1 ])
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then
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logger -t "adblock-[${adb_ver}] ${class}" "${log_msg}"
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if [ "${class}" = "error" ]
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then
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f_debug
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f_rmtemp
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f_rmdns
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f_dnsrestart
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exit 255
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fi
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fi
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}
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# f_debug: gather memory & space information
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f_debug()
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{
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local mem_total=0 mem_free=0 mem_swap=0 tmp_space=0 backup_space=0
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if [ ${adb_debug} -eq 1 ]
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then
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mem_total="$(awk '$1 ~ /^MemTotal/ {printf $2}' "/proc/meminfo")"
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mem_free="$(awk '$1 ~ /^MemFree/ {printf $2}' "/proc/meminfo")"
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mem_swap="$(awk '$1 ~ /^SwapTotal/ {printf $2}' "/proc/meminfo")"
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f_log "debug" "memory ::: total: ${mem_total}, free: ${mem_free}, swap: ${mem_swap}"
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if [ -d "${adb_tmpdir}" ]
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then
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tmp_space="$(df "${adb_tmpdir}" 2>/dev/null | tail -n1 | awk '{printf $4}')"
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fi
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if [ -d "${adb_dir_backup}" ]
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then
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backup_space="$(df "${adb_dir_backup}" 2>/dev/null | tail -n1 | awk '{printf $4}')"
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fi
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f_log "debug" "space ::: tmp_dir: ${adb_tmpdir}, tmp_kb: ${tmp_space}, backup: ${enabled_backup}, backup_dir: ${adb_dir_backup}, backup_kb: ${backup_space}"
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fi
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}
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# main function for block list processing
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#
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f_main()
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{
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local enabled url rc cnt sum_cnt=0
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local src_name src_rset shalla_file shalla_archive
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f_debug
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f_log "debug" "main ::: tool: ${adb_fetch}, parm: ${adb_fetchparm}"
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for src_name in ${adb_sources}
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do
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eval "enabled=\"\${enabled_${src_name}}\""
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eval "url=\"\${adb_src_${src_name}}\""
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eval "src_rset=\"\${adb_src_rset_${src_name}}\""
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adb_dnsfile="${adb_dnsdir}/${adb_dnsprefix}.${src_name}"
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> "${adb_tmpload}"
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> "${adb_tmpfile}"
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# basic pre-checks
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#
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if [ "${enabled}" = "0" ] || [ -z "${url}" ] || [ -z "${src_rset}" ]
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then
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f_list remove
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continue
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fi
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# download block list
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#
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f_log "debug" "loop ::: name: ${src_name}, enabled: ${enabled}, dnsfile: ${adb_dnsfile}"
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if [ "${src_name}" = "blacklist" ]
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then
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cat "${url}" > "${adb_tmpload}"
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rc=${?}
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elif [ "${src_name}" = "shalla" ]
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then
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shalla_archive="${adb_tmpdir}/shallalist.tar.gz"
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shalla_file="${adb_tmpdir}/shallalist.txt"
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"${adb_fetch}" ${adb_fetchparm} "${shalla_archive}" "${url}"
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rc=${?}
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if [ ${rc} -eq 0 ]
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then
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> "${shalla_file}"
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for category in ${adb_src_cat_shalla}
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do
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tar -xOzf "${shalla_archive}" BL/${category}/domains >> "${shalla_file}"
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rc=${?}
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if [ ${rc} -ne 0 ]
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then
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break
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fi
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done
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cat "${shalla_file}" > "${adb_tmpload}"
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rm -f "${shalla_file}"
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fi
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rm -f "${shalla_archive}"
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rm -rf "${adb_tmpdir}/BL"
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else
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"${adb_fetch}" ${adb_fetchparm} "${adb_tmpload}" "${url}"
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rc=${?}
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fi
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# check download result and prepare domain output (incl. list backup/restore)
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#
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f_log "debug" "loop ::: name: ${src_name}, load-rc: ${rc}"
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if [ ${rc} -eq 0 ] && [ -s "${adb_tmpload}" ]
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then
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awk "${src_rset}" "${adb_tmpload}" > "${adb_tmpfile}"
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if [ -s "${adb_tmpfile}" ]
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then
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f_list backup
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else
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f_list restore
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fi
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else
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f_list restore
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fi
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# remove whitelist domains, sort and make them unique, final list preparation
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#
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if [ -s "${adb_tmpfile}" ]
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then
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if [ -s "${adb_tmpdir}/tmp.whitelist" ]
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then
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grep -vf "${adb_tmpdir}/tmp.whitelist" "${adb_tmpfile}" | sort -u | eval "${adb_dnsformat}" > "${adb_dnsfile}"
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else
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sort -u "${adb_tmpfile}" | eval "${adb_dnsformat}" > "${adb_dnsfile}"
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fi
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rc=${?}
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if [ ${rc} -ne 0 ]
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then
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f_list remove
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fi
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fi
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f_log "debug" "loop ::: name: ${src_name}, list-rc: ${rc}"
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done
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# make overall sort, restart & check dns server
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#
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for src_name in $(ls -dASr "${adb_dnsdir}/${adb_dnsprefix}"* 2>/dev/null)
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do
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if [ -s "${adb_tmpdir}/blocklist.overall" ]
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then
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sort "${adb_tmpdir}/blocklist.overall" "${adb_tmpdir}/blocklist.overall" "${src_name}" | uniq -u > "${adb_tmpdir}/tmp.blocklist"
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cat "${adb_tmpdir}/tmp.blocklist" > "${src_name}"
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fi
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cat "${src_name}" >> "${adb_tmpdir}/blocklist.overall"
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cnt="$(wc -l < "${src_name}")"
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sum_cnt=$((sum_cnt + cnt))
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done
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f_dnsrestart
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if [ "${dns_running}" = "true" ]
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then
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f_debug
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f_rmtemp
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f_log "info " "status ::: block lists with overall ${sum_cnt} domains loaded (${adb_sysver})"
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ubus call service set "{\"name\":\"adblock_stats\",\"instances\":{\"stats\":{\"env\":{\"blocked_domains\":\"${sum_cnt}\",\"last_rundate\":\"$(/bin/date "+%d.%m.%Y %H:%M:%S")\"}}}}"
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exit 0
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fi
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f_log "error" "status ::: dns server restart with active block lists failed"
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}
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# handle different adblock actions
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#
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if [ "${adb_procd}" = "true" ]
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then
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f_envload
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case "${1}" in
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stop)
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f_rmtemp
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f_rmdns
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f_dnsrestart
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;;
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suspend)
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f_switch suspend
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;;
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resume)
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f_switch resume
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;;
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query)
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f_query "${2}"
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;;
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*)
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f_envcheck
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f_main
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;;
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esac
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fi
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exit 0
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