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693 lines
20 KiB
693 lines
20 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="3.0.2"
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adb_sysver="unknown"
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adb_enabled=0
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adb_debug=0
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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_triggerdelay=0
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adb_backup=0
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adb_backupdir="/mnt"
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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_dns="dnsmasq"
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adb_dnsprefix="adb_list"
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adb_dnsfile="${adb_dnsprefix}.overall"
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adb_rtfile="/tmp/adb_runtime.json"
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adb_action="${1:-"start"}"
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adb_cnt=0
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adb_rc=0
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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 dns_up sys_call sys_desc sys_model sys_ver cnt=0
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# get system information
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#
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sys_call="$(ubus -S call system board 2>/dev/null)"
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if [ -n "${sys_call}" ]
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then
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sys_desc="$(printf '%s' "${sys_call}" | jsonfilter -e '@.release.description')"
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sys_model="$(printf '%s' "${sys_call}" | jsonfilter -e '@.model')"
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sys_ver="$(cat /etc/turris-version 2>/dev/null)"
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if [ -n "${sys_ver}" ]
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then
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sys_desc="${sys_desc}/${sys_ver}"
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fi
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adb_sysver="${sys_model}, ${sys_desc}"
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fi
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# source in system libraries
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#
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if [ -r "/lib/functions.sh" ] && [ -r "/usr/share/libubox/jshn.sh" ]
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then
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. "/lib/functions.sh"
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. "/usr/share/libubox/jshn.sh"
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else
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f_log "error" "system libraries not found"
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fi
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# parse global section by callback
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#
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config_cb()
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{
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local type="${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}=\"${value}\""
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fi
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done
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}
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# load adblock config
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#
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config_load adblock
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config_foreach parse_config source
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# set/check dns backend environment
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#
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case "${adb_dns}" in
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dnsmasq)
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adb_dnsuser="${adb_dns}"
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adb_dnsdir="${adb_dnsdir:-"/tmp/dnsmasq.d"}"
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adb_dnsformat="awk '{print \"local=/\"\$0\"/\"}'"
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;;
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unbound)
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adb_dnsuser="${adb_dns}"
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adb_dnsdir="${adb_dnsdir:-"/var/lib/unbound"}"
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adb_dnsformat="awk '{print \"local-zone: \042\"\$0\"\042 static\"}'"
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;;
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named)
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adb_dnsuser="bind"
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adb_dnsdir="${adb_dnsdir:-"/var/lib/bind"}"
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adb_dnsformat="awk '{print \"\"\$0\" IN CNAME .\n*.\"\$0\" IN CNAME .\"}'"
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;;
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kresd)
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adb_dnsuser="root"
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adb_dnsdir="${adb_dnsdir:-"/etc/kresd"}"
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adb_dnsformat="awk '{print \"\"\$0\" CNAME .\n*.\"\$0\" CNAME .\"}'"
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adb_dnsheader="\$TTL 2h"$'\n'"@ IN SOA localhost. root.localhost. (2 6h 1h 1w 2h)"$'\n'" IN NS localhost."
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;;
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dnscrypt-proxy)
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adb_dnsuser="nobody"
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adb_dnsdir="${adb_dnsdir:-"/tmp"}"
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adb_dnsformat="awk '{print \$0}'"
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;;
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esac
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if [ -d "${adb_dnsdir}" ] && [ ! -f "${adb_dnsdir}/${adb_dnsfile}" ]
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then
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> "${adb_dnsdir}/${adb_dnsfile}"
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fi
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case "${adb_action}" in
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start|restart|reload)
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> "${adb_rtfile}"
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if [ "${adb_action}" = "start" ] && [ "${adb_trigger}" = "timed" ]
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then
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sleep ${adb_triggerdelay}
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fi
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;;
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esac
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while [ ${cnt} -le 30 ]
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do
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dns_up="$(ubus -S call service list "{\"name\":\"${adb_dns}\"}" 2>/dev/null | jsonfilter -l1 -e "@[\"${adb_dns}\"].instances.*.running" 2>/dev/null)"
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if [ "${dns_up}" = "true" ]
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then
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break
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fi
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sleep 1
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cnt=$((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" "'${adb_dns}' not running, DNS backend not 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}/${adb_dnsfile}" ]
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then
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f_rmdns
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f_dnsrestart
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fi
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f_jsnupdate
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f_log "info " "adblock is currently disabled, please set adb_enabled to '1' to use this service"
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exit 0
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fi
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# check fetch utility
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#
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ssl_lib="-"
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if [ -x "${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 [ "$(readlink -fn "${adb_fetch}")" = "/bin/busybox" ] ||
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([ "$(readlink -fn "/bin/wget")" = "/bin/busybox" ] && [ "$(readlink -fn "${adb_fetch}")" != "/usr/bin/wget" ])
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then
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adb_fetch="/bin/busybox"
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adb_fetchparm="-q -O"
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else
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ssl_lib="built-in"
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fi
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fi
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if [ ! -x "${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 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}" ] && [ -n "${adb_whitelist_rset}" ]
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then
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awk "${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 "${adb_dns}" ]
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then
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> "${adb_dnsdir}/${adb_dnsfile}"
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> "${adb_rtfile}"
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rm -f "${adb_dnsdir}/.${adb_dnsfile}"
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rm -f "${adb_backupdir}/${adb_dnsprefix}"*.gz
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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 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 [ "${dns_up}" = "true" ]
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then
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return 0
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fi
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cnt=$((cnt+1))
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sleep 1
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done
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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=${?}
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;;
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merge)
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if [ -s "${adb_tmpfile}" ]
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then
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cat "${adb_tmpfile}" >> "${adb_tmpdir}/${adb_dnsfile}"
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adb_rc=${?}
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fi
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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" "${adb_tmpdir}/${adb_dnsfile}" | eval "${adb_dnsformat}" > "${adb_dnsdir}/${adb_dnsfile}"
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else
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eval "${adb_dnsformat}" "${adb_tmpdir}/${adb_dnsfile}" > "${adb_dnsdir}/${adb_dnsfile}"
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fi
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if [ -n "${adb_dnsheader}" ]
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then
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printf '%s\n' "${adb_dnsheader}" | cat - "${adb_dnsdir}/${adb_dnsfile}" > "${adb_tmpdir}/${adb_dnsfile}"
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cat "${adb_tmpdir}/${adb_dnsfile}" > "${adb_dnsdir}/${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: ${adb_rc}"
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}
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# f_tldcompression: top level domain compression
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#
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f_tldcompression()
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{
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local source="${1}" temp="${adb_tmpload}"
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awk -F "." '{for(f=NF;f > 1;f--) printf "%s.", $f;print $1}' "${source}" 2>/dev/null | sort -u > "${temp}"
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awk '{if(NR==1){tld=$NF};while(getline){if($NF !~ tld"\\."){print tld;tld=$NF}}print tld}' "${temp}" 2>/dev/null > "${source}"
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awk -F "." '{for(f=NF;f > 1;f--) printf "%s.", $f;print $1}' "${source}" 2>/dev/null > "${temp}"
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sort -u "${temp}" > "${source}"
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}
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# f_switch: suspend/resume adblock processing
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#
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f_switch()
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{
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local source target status mode="${1}"
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if [ -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_dnsdir}/.${adb_dnsfile}"
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status="suspended"
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elif [ -s "${adb_dnsdir}/.${adb_dnsfile}" ] && [ "${mode}" = "resume" ]
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then
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source="${adb_dnsdir}/.${adb_dnsfile}"
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target="${adb_dnsdir}/${adb_dnsfile}"
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status="resumed"
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fi
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if [ -n "${status}" ]
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then
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cat "${source}" > "${target}"
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> "${source}"
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f_dnsrestart
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f_jsnupdate
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f_log "info " "adblock processing ${status}"
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fi
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}
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# f_query: query block list for certain (sub-)domains
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#
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f_query()
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{
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local search result cnt
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local domain="${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 single domain, e.g. 'doubleclick.net'"
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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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if [ "${adb_dns}" = "dnsmasq" ] || [ "${adb_dns}" = "unbound" ]
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then
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result="$(awk -F '/|\"' "/[\/\"\.]${search}/{i++;{printf(\" + %s\n\",\$2)};if(i>9){exit}}" "${adb_dnsfile}")"
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else
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result="$(awk "/(^[^\*][a-z]*[\.]+${search}|^${search})/{i++;{printf(\" + %s\n\",\$1)};if(i>9){exit}}" "${adb_dnsfile}")"
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fi
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printf "%s\n" "::: max. ten results for domain '${domain}'"
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printf "%s\n" "${result:-" - no match"}"
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domain="${tld}"
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tld="${domain#*.}"
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done
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fi
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}
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# f_jsnupdate: update runtime information
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#
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f_jsnupdate()
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{
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local status rundate="$(/bin/date "+%d.%m.%Y %H:%M:%S")"
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if [ ${adb_rc} -gt 0 ]
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then
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status="error"
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elif [ ${adb_enabled} -ne 1 ]
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then
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status="disabled"
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elif [ -s "${adb_dnsdir}/.${adb_dnsfile}" ]
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then
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status="paused"
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else
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status="enabled"
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if [ -s "${adb_dnsdir}/${adb_dnsfile}" ]
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then
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if [ "${adb_dns}" = "named" ] || [ "${adb_dns}" = "kresd" ]
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then
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adb_cnt="$(( ( $(wc -l < "${adb_dnsdir}/${adb_dnsfile}") - $(printf "%s" "${adb_dnsheader}" | grep -c "^") ) / 2 ))"
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else
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adb_cnt="$(( $(wc -l < "${adb_dnsdir}/${adb_dnsfile}") - $(printf "%s" "${adb_dnsheader}" | grep -c "^") ))"
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fi
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fi
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fi
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if [ -z "${adb_fetchinfo}" ] && [ -s "${adb_rtfile}" ]
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then
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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_var adb_fetchinfo "fetch_utility"
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fi
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json_init
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json_add_object "data"
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json_add_string "adblock_status" "${status}"
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json_add_string "adblock_version" "${adb_ver}"
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json_add_string "blocked_domains" "${adb_cnt}"
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json_add_string "fetch_utility" "${adb_fetchinfo}"
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json_add_string "dns_backend" "${adb_dns} (${adb_dnsdir})"
|
|
json_add_string "last_rundate" "${rundate}"
|
|
json_add_string "system_release" "${adb_sysver}"
|
|
json_close_object
|
|
json_dump > "${adb_rtfile}"
|
|
}
|
|
|
|
# f_status: output runtime information
|
|
#
|
|
f_status()
|
|
{
|
|
local key keylist value
|
|
|
|
if [ -s "${adb_rtfile}" ]
|
|
then
|
|
printf "%s\n" "::: adblock runtime information"
|
|
json_load "$(cat "${adb_rtfile}" 2>/dev/null)"
|
|
json_select data
|
|
json_get_keys keylist
|
|
for key in ${keylist}
|
|
do
|
|
json_get_var value "${key}"
|
|
printf " + %-15s : %s\n" "${key}" "${value}"
|
|
done
|
|
fi
|
|
}
|
|
|
|
# f_log: write to syslog, exit on error
|
|
#
|
|
f_log()
|
|
{
|
|
local class="${1}" log_msg="${2}"
|
|
|
|
if [ -n "${log_msg}" ] && ([ "${class}" != "debug" ] || [ ${adb_debug} -eq 1 ])
|
|
then
|
|
logger -t "adblock-[${adb_ver}] ${class}" "${log_msg}"
|
|
if [ "${class}" = "error" ]
|
|
then
|
|
logger -t "adblock-[${adb_ver}] ${class}" "Please check 'https://github.com/openwrt/packages/blob/master/net/adblock/files/README.md' (${adb_sysver})"
|
|
f_rmtemp
|
|
if [ -s "${adb_dnsdir}/${adb_dnsfile}" ]
|
|
then
|
|
f_rmdns
|
|
f_dnsrestart
|
|
fi
|
|
adb_rc=1
|
|
f_jsnupdate
|
|
exit 1
|
|
fi
|
|
fi
|
|
}
|
|
|
|
# main function for block list processing
|
|
#
|
|
f_main()
|
|
{
|
|
local src_name src_rset shalla_archive enabled url hash_old hash_new
|
|
local mem_total="$(awk '/^MemTotal/ {print int($2/1000)}' "/proc/meminfo")"
|
|
|
|
f_log "info " "start adblock processing ..."
|
|
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}"
|
|
> "${adb_rtfile}"
|
|
for src_name in ${adb_sources}
|
|
do
|
|
eval "enabled=\"\${enabled_${src_name}}\""
|
|
eval "url=\"\${adb_src_${src_name}}\""
|
|
eval "src_rset=\"\${adb_src_rset_${src_name}}\""
|
|
> "${adb_tmpload}"
|
|
> "${adb_tmpfile}"
|
|
adb_rc=4
|
|
|
|
# basic pre-checks
|
|
#
|
|
f_log "debug" "name: ${src_name}, enabled: ${enabled}, url: ${url}, rset: ${src_rset}"
|
|
if [ "${enabled}" != "1" ] || [ -z "${url}" ] || [ -z "${src_rset}" ]
|
|
then
|
|
f_list remove
|
|
continue
|
|
fi
|
|
|
|
# manual / backup mode
|
|
#
|
|
if [ ${adb_manmode} -eq 1 ] && [ "${adb_action}" = "start" ] && [ "${src_name}" != "blacklist" ]
|
|
then
|
|
f_list restore
|
|
if [ ${adb_rc} -eq 0 ] && [ -s "${adb_tmpfile}" ]
|
|
then
|
|
f_list merge
|
|
continue
|
|
fi
|
|
fi
|
|
|
|
# download block list
|
|
#
|
|
if [ "${src_name}" = "blacklist" ] && [ -s "${url}" ]
|
|
then
|
|
cat "${url}" > "${adb_tmpload}"
|
|
adb_rc=${?}
|
|
elif [ "${src_name}" = "shalla" ]
|
|
then
|
|
shalla_archive="${adb_tmpdir}/shallalist.tar.gz"
|
|
"${adb_fetch}" ${adb_fetchparm} "${shalla_archive}" "${url}" 2>/dev/null
|
|
adb_rc=${?}
|
|
if [ ${adb_rc} -eq 0 ]
|
|
then
|
|
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 list 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
|
|
f_tldcompression "${adb_tmpfile}"
|
|
if [ "${src_name}" != "blacklist" ]
|
|
then
|
|
f_list backup
|
|
fi
|
|
else
|
|
f_list restore
|
|
fi
|
|
else
|
|
f_list restore
|
|
fi
|
|
|
|
# list merge
|
|
#
|
|
if [ ${adb_rc} -eq 0 ] && [ -s "${adb_tmpfile}" ]
|
|
then
|
|
f_list merge
|
|
if [ ${adb_rc} -ne 0 ]
|
|
then
|
|
f_list remove
|
|
fi
|
|
else
|
|
f_list remove
|
|
fi
|
|
done
|
|
|
|
# hash preparation, whitelist removal and overall sort
|
|
#
|
|
if [ -f "${adb_dnsdir}/${adb_dnsfile}" ]
|
|
then
|
|
hash_old="$(sha256sum "${adb_dnsdir}/${adb_dnsfile}" 2>/dev/null | awk '{print $1}')"
|
|
fi
|
|
if [ -s "${adb_tmpdir}/${adb_dnsfile}" ]
|
|
then
|
|
if [ ${mem_total} -ge 64 ] || [ ${adb_forcesrt} -eq 1 ]
|
|
then
|
|
f_tldcompression "${adb_tmpdir}/${adb_dnsfile}"
|
|
fi
|
|
f_list format
|
|
else
|
|
> "${adb_dnsdir}/${adb_dnsfile}"
|
|
fi
|
|
chown "${adb_dnsuser}" "${adb_dnsdir}/${adb_dnsfile}" 2>/dev/null
|
|
f_rmtemp
|
|
|
|
# conditional restart of the dns backend and runtime information export
|
|
#
|
|
hash_new="$(sha256sum "${adb_dnsdir}/${adb_dnsfile}" 2>/dev/null | awk '{print $1}')"
|
|
if [ -z "${hash_old}" ] || [ -z "${hash_new}" ] || [ "${hash_old}" != "${hash_new}" ]
|
|
then
|
|
f_dnsrestart
|
|
fi
|
|
if [ ${?} -eq 0 ]
|
|
then
|
|
f_jsnupdate "${adb_cnt}"
|
|
f_log "info " "block list with overall ${adb_cnt} domains loaded successfully (${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
|