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616 lines
18 KiB
616 lines
18 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="2.8.3"
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adb_sysver="$(ubus -S call system board | jsonfilter -e '@.release.description')"
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adb_enabled=1
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adb_debug=0
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adb_minfree=2
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adb_manmode=0
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adb_forcesrt=0
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adb_forcedns=0
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adb_backup=0
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adb_backupdir="/mnt"
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adb_whitelist="/etc/adblock/adblock.whitelist"
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adb_whitelist_rset="\$1 ~/^([A-Za-z0-9_-]+\.){1,}[A-Za-z]+/{print tolower(\"^\"\$1\"\\\|[.]\"\$1)}"
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adb_fetch="/usr/bin/wget"
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adb_fetchparm="--quiet --no-cache --no-cookies --max-redirect=0 --timeout=10 --no-check-certificate -O"
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adb_dnslist="dnsmasq unbound named"
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adb_dnsprefix="adb_list"
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adb_dnsfile="${adb_dnsprefix}.overall"
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adb_rtfile="/tmp/adb_runtime.json"
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adb_sources=""
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adb_src_cat_shalla=""
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adb_action="${1}"
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# f_envload: load adblock environment
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#
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f_envload()
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{
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local services dns_up cnt=0
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# source in system libraries
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#
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if [ -r "/lib/functions.sh" ] && [ -r "/usr/share/libubox/jshn.sh" ]
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then
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. "/lib/functions.sh"
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. "/usr/share/libubox/jshn.sh"
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else
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f_log "error" "system libraries not found"
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fi
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# parse global section by callback
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#
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config_cb()
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{
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local type="${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}=\"${value}\""
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}
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else
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reset_cb
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fi
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}
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# parse 'source' sections
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#
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parse_config()
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{
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local value opt section="${1}" options="enabled adb_src adb_src_rset adb_src_cat"
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eval "adb_sources=\"${adb_sources} ${section}\""
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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 source
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# set dns backend environment
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#
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while [ ${cnt} -le 20 ]
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do
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services="$(ubus -S call service list 2>/dev/null)"
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if [ -n "${services}" ]
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then
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for dns in ${adb_dnslist}
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do
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dns_up="$(printf "%s" "${services}" | jsonfilter -l1 -e "@.${dns}.instances.*.running")"
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if [ "${dns_up}" = "true" ]
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then
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case "${dns}" in
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dnsmasq)
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adb_dns="${dns}"
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adb_dnsdir="${adb_dnsdir:="/tmp/dnsmasq.d"}"
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adb_dnshidedir="${adb_dnsdir}/.adb_hidden"
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adb_dnsformat="awk '{print \"local=/\"\$0\"/\"}'"
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break 2
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;;
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unbound)
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adb_dns="${dns}"
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adb_dnsdir="${adb_dnsdir:="/var/lib/unbound"}"
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adb_dnshidedir="${adb_dnsdir}/.adb_hidden"
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adb_dnsformat="awk '{print \"local-zone: \042\"\$0\"\042 static\"}'"
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break 2
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;;
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named)
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adb_dns="${dns}"
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adb_dnsdir="${adb_dnsdir:="/var/lib/bind"}"
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adb_dnshidedir="${adb_dnsdir}/.adb_hidden"
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adb_dnsformat="awk '{print \"\"\$0\" IN CNAME .\n*.\"\$0\" IN CNAME .\"}'"
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break 2
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;;
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esac
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fi
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done
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fi
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sleep 1
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cnt=$((cnt+1))
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done
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if [ -z "${adb_dns}" ] || [ -z "${adb_dnsformat}" ] || [ ! -x "$(command -v ${adb_dns})" ] || [ ! -d "${adb_dnsdir}" ]
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then
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f_log "error" "no active/supported DNS backend found"
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fi
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# force dns to local resolver
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#
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if [ ${adb_forcedns} -eq 1 ] && [ -z "$(uci -q get firewall.adblock_dns)" ]
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then
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uci -q set firewall.adblock_dns="redirect"
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uci -q set firewall.adblock_dns.name="Adblock DNS"
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uci -q set firewall.adblock_dns.src="lan"
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uci -q set firewall.adblock_dns.proto="tcp udp"
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uci -q set firewall.adblock_dns.src_dport="53"
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uci -q set firewall.adblock_dns.dest_port="53"
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uci -q set firewall.adblock_dns.target="DNAT"
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elif [ ${adb_forcedns} -eq 0 ] && [ -n "$(uci -q get firewall.adblock_dns)" ]
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then
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uci -q delete firewall.adblock_dns
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fi
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if [ -n "$(uci -q changes firewall)" ]
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then
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uci -q commit firewall
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if [ $(/etc/init.d/firewall enabled; printf "%u" ${?}) -eq 0 ]
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then
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/etc/init.d/firewall reload >/dev/null 2>&1
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fi
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fi
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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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local ssl_lib
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# check 'enabled' option
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#
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if [ ${adb_enabled} -ne 1 ]
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then
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if [ -s "${adb_dnsdir}/${adb_dnsfile}" ]
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then
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f_rmdns
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f_dnsrestart
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fi
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f_log "info " "adblock is currently disabled, please set adb_enabled to '1' to use this service"
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exit 0
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fi
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# check fetch utility
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#
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ssl_lib="-"
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if [ -x "${adb_fetch}" ]
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then
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if [ "$(readlink -fn "${adb_fetch}")" = "/usr/bin/wget-nossl" ]
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then
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adb_fetchparm="--quiet --no-cache --no-cookies --max-redirect=0 --timeout=10 -O"
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elif [ "$(readlink -fn "/bin/wget")" = "/bin/busybox" ] || [ "$(readlink -fn "${adb_fetch}")" = "/bin/busybox" ]
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then
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adb_fetch="/bin/busybox"
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adb_fetchparm="-q -O"
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else
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ssl_lib="built-in"
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fi
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fi
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if [ ! -x "${adb_fetch}" ] && [ "$(readlink -fn "/bin/wget")" = "/bin/uclient-fetch" ]
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then
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adb_fetch="/bin/uclient-fetch"
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if [ -f "/lib/libustream-ssl.so" ]
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then
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adb_fetchparm="-q --timeout=10 --no-check-certificate -O"
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ssl_lib="libustream-ssl"
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else
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adb_fetchparm="-q --timeout=10 -O"
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fi
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fi
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if [ ! -x "${adb_fetch}" ] || [ -z "${adb_fetch}" ] || [ -z "${adb_fetchparm}" ]
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then
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f_log "error" "no download utility found, please install 'uclient-fetch' with 'libustream-mbedtls' or the full 'wget' package"
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fi
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adb_fetchinfo="${adb_fetch##*/} (${ssl_lib})"
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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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chown -R "${adb_dns}":"${adb_dns}" "${adb_dnshidedir}" 2>/dev/null
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else
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rm -f "${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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}
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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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if [ -d "${adb_tmpdir}" ]
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then
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rm -f "${adb_tmpload}"
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rm -f "${adb_tmpfile}"
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rm -rf "${adb_tmpdir}"
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fi
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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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if [ -n "${adb_dns}" ]
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then
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rm -f "${adb_dnsdir}/${adb_dnsprefix}"*
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rm -f "${adb_backupdir}/${adb_dnsprefix}"*.gz
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rm -rf "${adb_dnshidedir}"
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> "${adb_rtfile}"
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fi
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}
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# f_dnsrestart: restart the dns backend
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#
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f_dnsrestart()
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{
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local dns_up mem_free cnt=0
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"/etc/init.d/${adb_dns}" restart >/dev/null 2>&1
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while [ ${cnt} -le 10 ]
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do
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dns_up="$(ubus -S call service list "{\"name\":\"${adb_dns}\"}" | jsonfilter -l1 -e "@.${adb_dns}.instances.*.running")"
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if [ "${dns_up}" = "true" ]
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then
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mem_free="$(awk '/^MemFree/ {print int($2/1000)}' "/proc/meminfo")"
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if [ ${mem_free} -ge ${adb_minfree} ]
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then
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return 0
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fi
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fi
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cnt=$((cnt+1))
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sleep 1
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done
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return 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="${1}" in_rc="${adb_rc}" cnt=0
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case "${mode}" in
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backup)
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cnt="$(wc -l < "${adb_tmpfile}")"
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if [ ${adb_backup} -eq 1 ] && [ -d "${adb_backupdir}" ]
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then
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gzip -cf "${adb_tmpfile}" > "${adb_backupdir}/${adb_dnsprefix}.${src_name}.gz"
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adb_rc=${?}
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fi
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;;
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restore)
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if [ ${adb_backup} -eq 1 ] && [ -d "${adb_backupdir}" ] &&
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[ -f "${adb_backupdir}/${adb_dnsprefix}.${src_name}.gz" ]
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then
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gunzip -cf "${adb_backupdir}/${adb_dnsprefix}.${src_name}.gz" > "${adb_tmpfile}"
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adb_rc=${?}
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fi
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;;
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remove)
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if [ -d "${adb_backupdir}" ]
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then
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rm -f "${adb_backupdir}/${adb_dnsprefix}.${src_name}.gz"
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fi
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adb_rc=${?}
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;;
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format)
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if [ -s "${adb_tmpdir}/tmp.whitelist" ]
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then
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grep -vf "${adb_tmpdir}/tmp.whitelist" "${adb_tmpfile}" | eval "${adb_dnsformat}" >> "${adb_tmpdir}/${adb_dnsfile}"
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else
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eval "${adb_dnsformat}" "${adb_tmpfile}" >> "${adb_tmpdir}/${adb_dnsfile}"
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fi
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adb_rc=${?}
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;;
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esac
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f_log "debug" "name: ${src_name}, mode: ${mode}, count: ${cnt}, in_rc: ${in_rc}, out_rc: ${adb_rc}"
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}
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# f_switch: suspend/resume adblock processing
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#
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f_switch()
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{
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local source target status mode="${1}"
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if [ -d "${adb_dnshidedir}" ]
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then
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if [ -s "${adb_dnsdir}/${adb_dnsfile}" ] && [ "${mode}" = "suspend" ]
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then
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source="${adb_dnsdir}/${adb_dnsfile}"
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target="${adb_dnshidedir}"
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status="suspended"
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elif [ -s "${adb_dnshidedir}/${adb_dnsfile}" ] && [ "${mode}" = "resume" ]
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then
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source="${adb_dnshidedir}/${adb_dnsfile}"
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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 " "adblock processing ${status}"
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fi
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fi
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}
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# f_query: query block list for certain (sub-)domains
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#
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f_query()
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{
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local search result cnt
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local domain="${1}"
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local tld="${domain#*.}"
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if [ ! -s "${adb_dnsdir}/${adb_dnsfile}" ]
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then
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printf "%s\n" "::: no active block list found, please start / resume adblock first"
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elif [ -z "${domain}" ] || [ "${domain}" = "${tld}" ]
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then
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printf "%s\n" "::: invalid domain input, please submit a specific (sub-)domain, e.g. 'www.abc.xyz'"
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else
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cd "${adb_dnsdir}"
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while [ "${domain}" != "${tld}" ]
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do
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search="${domain//./\.}"
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result="$(grep -Hm5 "[/\"\.]${search}[/\"]" "${adb_dnsfile}" | awk -F ':|=|/|\"' '{printf(" + %s\n",$4)}')"
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printf "%s\n" "::: results for (sub-)domain '${domain}' (max. 5)"
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printf "%s\n" "${result:=" - no match"}"
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domain="${tld}"
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tld="${domain#*.}"
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done
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fi
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}
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# f_status: output runtime information
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#
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f_status()
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{
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local key keylist value
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if [ -s "${adb_rtfile}" ]
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then
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if [ -s "${adb_dnsdir}/${adb_dnsfile}" ]
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then
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value="active"
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else
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value="no domains blocked"
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fi
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printf "%s\n" "::: adblock runtime information"
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printf " %-15s : %s\n" "status" "${value}"
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json_load "$(cat "${adb_rtfile}" 2>/dev/null)"
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json_select data
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json_get_keys keylist
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for key in ${keylist}
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do
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json_get_var value "${key}"
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printf " %-15s : %s\n" "${key}" "${value}"
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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="${1}" log_msg="${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 [ "${class}" = "error" ]
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then
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logger -t "adblock-[${adb_ver}] ${class}" "Please check 'https://github.com/openwrt/packages/blob/master/net/adblock/files/README.md' (${adb_sysver})"
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f_rmtemp
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if [ -s "${adb_dnsdir}/${adb_dnsfile}" ]
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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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exit 1
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fi
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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 src_name src_rset shalla_archive enabled url hash_old hash_new cnt=0
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local mem_total="$(awk '/^MemTotal/ {print int($2/1000)}' "/proc/meminfo")"
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f_log "info " "start adblock processing ..."
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f_log "debug" "action: ${adb_action}, manual_mode:${adb_manmode}, backup: ${adb_backup}, dns: ${adb_dns}, fetch: ${adb_fetchinfo}, mem_total: ${mem_total}, force_srt/_dns: ${adb_forcesrt}/${adb_forcedns}"
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> "${adb_rtfile}"
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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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> "${adb_tmpload}"
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> "${adb_tmpfile}"
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adb_rc=4
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# basic pre-checks
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#
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f_log "debug" "name: ${src_name}, enabled: ${enabled}, url: ${url}, rset: ${src_rset}"
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if [ "${enabled}" != "1" ] || [ -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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# manual mode
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#
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if [ ${adb_manmode} -eq 1 ] && [ -z "${adb_action}" ] && [ "${src_name}" != "blacklist" ]
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then
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f_list restore
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if [ ${adb_rc} -eq 0 ] && [ -s "${adb_tmpfile}" ]
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then
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f_list format
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continue
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fi
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fi
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# download block list
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#
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if [ "${src_name}" = "blacklist" ] && [ -s "${url}" ]
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then
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cat "${url}" > "${adb_tmpload}"
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adb_rc=${?}
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elif [ "${src_name}" = "shalla" ]
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then
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shalla_archive="${adb_tmpdir}/shallalist.tar.gz"
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"${adb_fetch}" ${adb_fetchparm} "${shalla_archive}" "${url}" 2>/dev/null
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adb_rc=${?}
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if [ ${adb_rc} -eq 0 ]
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then
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for category in ${adb_src_cat_shalla}
|
|
do
|
|
tar -xOzf "${shalla_archive}" "BL/${category}/domains" >> "${adb_tmpload}"
|
|
adb_rc=${?}
|
|
if [ ${adb_rc} -ne 0 ]
|
|
then
|
|
break
|
|
fi
|
|
done
|
|
fi
|
|
rm -f "${shalla_archive}"
|
|
rm -rf "${adb_tmpdir}/BL"
|
|
else
|
|
"${adb_fetch}" ${adb_fetchparm} "${adb_tmpload}" "${url}" 2>/dev/null
|
|
adb_rc=${?}
|
|
fi
|
|
|
|
# check download result and prepare domain output (incl. tld compression, list backup & restore)
|
|
#
|
|
if [ ${adb_rc} -eq 0 ] && [ -s "${adb_tmpload}" ]
|
|
then
|
|
awk "${src_rset}" "${adb_tmpload}" 2>/dev/null > "${adb_tmpfile}"
|
|
if [ -s "${adb_tmpfile}" ]
|
|
then
|
|
awk -F "." '{for(f=NF;f > 1;f--) printf "%s.", $f;print $1}' "${adb_tmpfile}" 2>/dev/null | sort -u > "${adb_tmpload}"
|
|
awk '{if(NR==1){tld=$NF};while(getline){if($NF !~ tld"\\."){print tld;tld=$NF}}print tld}' "${adb_tmpload}" 2>/dev/null > "${adb_tmpfile}"
|
|
awk -F "." '{for(f=NF;f > 1;f--) printf "%s.", $f;print $1}' "${adb_tmpfile}" 2>/dev/null > "${adb_tmpload}"
|
|
mv -f "${adb_tmpload}" "${adb_tmpfile}"
|
|
f_list backup
|
|
else
|
|
f_list restore
|
|
fi
|
|
else
|
|
f_list restore
|
|
fi
|
|
|
|
# remove whitelist domains, final list preparation
|
|
#
|
|
if [ ${adb_rc} -eq 0 ] && [ -s "${adb_tmpfile}" ]
|
|
then
|
|
f_list format
|
|
if [ ${adb_rc} -ne 0 ]
|
|
then
|
|
f_list remove
|
|
fi
|
|
else
|
|
f_list remove
|
|
fi
|
|
done
|
|
|
|
# hash preparation and overall sort
|
|
#
|
|
if [ -f "${adb_dnsdir}/${adb_dnsfile}" ]
|
|
then
|
|
hash_old="$(sha256sum "${adb_dnsdir}/${adb_dnsfile}" | awk '{print $1}')"
|
|
fi
|
|
if [ -s "${adb_tmpdir}/${adb_dnsfile}" ]
|
|
then
|
|
if [ ${mem_total} -ge 64 ] || [ ${adb_forcesrt} -eq 1 ]
|
|
then
|
|
sort -u "${adb_tmpdir}/${adb_dnsfile}" > "${adb_dnsdir}/${adb_dnsfile}"
|
|
else
|
|
mv -f "${adb_tmpdir}/${adb_dnsfile}" "${adb_dnsdir}" 2>/dev/null
|
|
fi
|
|
else
|
|
> "${adb_dnsdir}/${adb_dnsfile}"
|
|
fi
|
|
hash_new="$(sha256sum "${adb_dnsdir}/${adb_dnsfile}" | awk '{print $1}')"
|
|
cnt="$(wc -l < "${adb_dnsdir}/${adb_dnsfile}")"
|
|
|
|
# conditional restart of the dns backend and runtime information export
|
|
#
|
|
chown "${adb_dns}":"${adb_dns}" "${adb_dnsdir}/${adb_dnsfile}" 2>/dev/null
|
|
f_rmtemp
|
|
if [ "${hash_old}" != "${hash_new}" ]
|
|
then
|
|
f_dnsrestart
|
|
fi
|
|
if [ ${?} -eq 0 ]
|
|
then
|
|
json_init
|
|
json_add_object "data"
|
|
json_add_string "adblock_version" "${adb_ver}"
|
|
json_add_string "blocked_domains" "${cnt}"
|
|
json_add_string "fetch_info" "${adb_fetchinfo}"
|
|
json_add_string "dns_backend" "${adb_dns}"
|
|
json_add_string "last_rundate" "$(/bin/date "+%d.%m.%Y %H:%M:%S")"
|
|
json_add_string "system" "${adb_sysver}"
|
|
json_close_object
|
|
json_dump > "${adb_rtfile}"
|
|
f_log "info " "block list with overall ${cnt} domains loaded successfully (${adb_sysver})"
|
|
else
|
|
f_log "error" "dns backend restart with active block list failed"
|
|
fi
|
|
}
|
|
|
|
# handle different adblock actions
|
|
#
|
|
f_envload
|
|
case "${adb_action}" in
|
|
stop)
|
|
f_rmtemp
|
|
f_rmdns
|
|
f_dnsrestart
|
|
;;
|
|
restart)
|
|
f_rmtemp
|
|
f_rmdns
|
|
f_envcheck
|
|
f_main
|
|
;;
|
|
suspend)
|
|
f_switch suspend
|
|
;;
|
|
resume)
|
|
f_switch resume
|
|
;;
|
|
query)
|
|
f_query "${2}"
|
|
;;
|
|
status)
|
|
f_status
|
|
;;
|
|
*)
|
|
f_envcheck
|
|
f_main
|
|
;;
|
|
esac
|
|
exit 0
|