313 lines
10 KiB
Bash
Executable File
313 lines
10 KiB
Bash
Executable File
#!/bin/sh
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# dns based ad/abuse domain blocking script
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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 the C locale
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#
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LC_ALL=C
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# set pid & logger
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#
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adb_pid="${$}"
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adb_pidfile="/var/run/adblock.pid"
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adb_log="$(which logger)"
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if [ -r "${adb_pidfile}" ]
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then
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rc=255
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"${adb_log}" -s -t "adblock[${adb_pid}] error" "adblock service already running ($(cat ${adb_pidfile}))"
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exit ${rc}
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else
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printf "${adb_pid}" > "${adb_pidfile}"
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fi
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# get current directory and set script/config version
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#
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adb_scriptdir="${0%/*}"
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adb_scriptver="1.2.1"
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adb_mincfgver="2.2"
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# source in adblock function library
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#
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if [ -r "${adb_scriptdir}/adblock-helper.sh" ]
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then
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. "${adb_scriptdir}/adblock-helper.sh"
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else
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rc=254
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"${adb_log}" -s -t "adblock[${adb_pid}] error" "adblock function library not found"
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rm -f "${adb_pidfile}"
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exit ${rc}
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fi
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# call trap function on error signals (HUP, INT, QUIT, BUS, SEGV, TERM)
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#
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trap "rc=250; f_log 'error signal received/trapped' '${rc}'; f_exit" 1 2 3 10 11 15
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# load environment
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#
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f_envload
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# start logging
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#
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f_log "domain adblock processing started (${adb_scriptver}, ${adb_sysver}, $(/bin/date "+%d.%m.%Y %H:%M:%S"))"
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# check environment
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#
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f_envcheck
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# loop through active adblock domain sources,
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# download sources, prepare output and store all extracted domains in temp file
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#
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for src_name in ${adb_sources}
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do
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eval "url=\"\${adb_src_${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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list_time="$(${adb_uci} -q get "adblock.${src_name}.adb_src_timestamp")"
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f_log "=> processing adblock source '${src_name}'"
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# check 'url' and 'src_rset' values
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#
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if [ -z "${url}" ] || [ -z "${src_rset}" ]
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then
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"${adb_uci}" -q set "adblock.${src_name}.adb_src_timestamp=broken config"
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f_log " broken source configuration, check 'adb_src' and 'adb_src_rset' in config"
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continue
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fi
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# prepare find statement with active adblock list sources
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#
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if [ -z "${adb_srclist}" ]
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then
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adb_srclist="! -name ${adb_dnsprefix}.${src_name}*"
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else
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adb_srclist="${adb_srclist} -a ! -name ${adb_dnsprefix}.${src_name}*"
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fi
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# download only block list with newer/updated timestamp
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#
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if [ "${src_name}" = "blacklist" ]
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then
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url_time="$(date -r "${url}")"
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else
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url_time="$(${adb_fetch} ${fetch_parm} --server-response --spider "${url}" 2>&1 | awk '$0 ~ /Last-Modified/ {printf substr($0,18)}')"
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fi
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if [ -z "${url_time}" ]
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then
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url_time="$(date)"
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f_log " no online timestamp received"
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fi
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if [ -z "${list_time}" ] || [ "${list_time}" != "${url_time}" ] || [ ! -r "${adb_dnsfile}" ] ||\
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([ "${backup_ok}" = "true" ] && [ ! -r "${adb_dir_backup}/${adb_dnsprefix}.${src_name}.gz" ])
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then
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if [ "${src_name}" = "blacklist" ]
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then
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tmp_domains="$(cat "${url}")"
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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}" ${fetch_parm} --output-document="${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 [ $((rc)) -ne 0 ]
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then
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f_log " archive extraction failed (${category})"
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break
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fi
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done
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tmp_domains="$(cat "${shalla_file}")"
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rm -rf "${adb_tmpdir}/BL"
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rm -f "${shalla_archive}"
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rm -f "${shalla_file}"
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fi
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else
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tmp_domains="$(${adb_fetch} ${fetch_parm} --output-document=- "${url}")"
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fi
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rc=${?}
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else
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f_log " source doesn't change, no update required"
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continue
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fi
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# check download result and prepare domain output, backup/restore if needed
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#
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if [ $((rc)) -eq 0 ] && [ -n "${tmp_domains}" ]
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then
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count="$(printf "%s\n" "${tmp_domains}" | awk "${src_rset}" | tee "${adb_tmpfile}" | wc -l)"
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"${adb_uci}" -q set "adblock.${src_name}.adb_src_timestamp=${url_time}"
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if [ "${backup_ok}" = "true" ]
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then
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gzip -cf "${adb_tmpfile}" > "${adb_dir_backup}/${adb_dnsprefix}.${src_name}.gz"
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fi
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f_log " source download finished (${count} entries)"
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unset tmp_domains
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elif [ $((rc)) -eq 0 ] && [ -z "${tmp_domains}" ]
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then
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"${adb_uci}" -q set "adblock.${src_name}.adb_src_timestamp=empty download"
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f_log " empty source download finished"
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continue
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else
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rc=0
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if [ "${backup_ok}" = "true" ] && [ -r "${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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count="$(wc -l < "${adb_tmpfile}")"
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"${adb_uci}" -q set "adblock.${src_name}.adb_src_timestamp=list restored"
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f_log " source download failed, list restored (${count} entries)"
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else
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"${adb_uci}" -q set "adblock.${src_name}.adb_src_timestamp=download failed"
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f_log " source download failed"
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continue
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fi
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fi
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# remove whitelist domains, sort domains and make them unique,
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# rewrite ad/abuse domain information to separate dnsmasq files
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#
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if [ $((count)) -gt 0 ] && [ -n "${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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# finish domain processing, prepare find statement with revised adblock list source
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#
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if [ $((rc)) -eq 0 ]
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then
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if [ -z "${adb_revsrclist}" ]
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then
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adb_revsrclist="-name ${adb_dnsprefix}.${src_name}"
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else
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adb_revsrclist="${adb_revsrclist} -o -name ${adb_dnsprefix}.${src_name}"
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fi
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f_log " domain merging finished"
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else
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rc=0
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rm -f "${adb_dnsfile}"
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if [ "${backup_ok}" = "true" ] && [ -r "${adb_dir_backup}/${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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f_log " domain merging failed, list removed"
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continue
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fi
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else
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rm -f "${adb_dnsfile}"
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if [ "${backup_ok}" = "true" ] && [ -r "${adb_dir_backup}/${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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"${adb_uci}" -q set "adblock.${src_name}.adb_src_timestamp=empty domain input"
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f_log " empty domain input received, list removed"
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continue
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fi
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done
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# remove disabled adblock lists and their backups
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#
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if [ -n "${adb_srclist}" ]
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then
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rm_done="$(find "${adb_dnsdir}" -maxdepth 1 -type f \( ${adb_srclist} \) -print -exec rm -f "{}" \;)"
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if [ "${backup_ok}" = "true" ] && [ -n "${rm_done}" ]
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then
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find "${adb_dir_backup}" -maxdepth 1 -type f \( ${adb_srclist} \) -exec rm -f "{}" \;
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fi
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else
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rm_done="$(find "${adb_dnsdir}" -maxdepth 1 -type f -name "${adb_dnsprefix}*" -print -exec rm -f "{}" \;)"
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if [ "${backup_ok}" = "true" ]
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then
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find "${adb_dir_backup}" -maxdepth 1 -type f -name "${adb_dnsprefix}*" -exec rm -f "{}" \;
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fi
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fi
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if [ -n "${rm_done}" ]
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then
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f_rmconfig "${rm_done}"
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f_log "disabled adblock lists removed"
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fi
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# make separate adblock lists entries unique
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#
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if [ "${mem_ok}" = "true" ] && [ -n "${adb_revsrclist}" ]
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then
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f_log "remove duplicates in separate adblock lists"
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# generate a unique overall block list
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#
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sort -u "${adb_dnsdir}/${adb_dnsprefix}."* > "${adb_tmpdir}/blocklist.overall"
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# loop through all separate lists, ordered by size (ascending)
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#
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for list in $(ls -ASr "${adb_dnsdir}/${adb_dnsprefix}"*)
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do
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# check overall block list vs. separate block list,
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# write all duplicate entries to separate list
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#
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list="${list/*./}"
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sort "${adb_tmpdir}/blocklist.overall" "${adb_dnsdir}/${adb_dnsprefix}.${list}" | uniq -d > "${adb_tmpdir}/tmp.${list}"
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mv -f "${adb_tmpdir}/tmp.${list}" "${adb_dnsdir}/${adb_dnsprefix}.${list}"
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# write all unique entries back to overall block list
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#
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sort "${adb_tmpdir}/blocklist.overall" "${adb_dnsdir}/${adb_dnsprefix}.${list}" | uniq -u > "${adb_tmpdir}/tmp.overall"
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mv -f "${adb_tmpdir}/tmp.overall" "${adb_tmpdir}/blocklist.overall"
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done
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rm -f "${adb_tmpdir}/blocklist.overall"
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fi
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# restart & check dnsmasq with newly generated set of adblock lists
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#
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f_cntconfig
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adb_count="$(${adb_uci} -q get "adblock.global.adb_overall_count")"
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if [ -n "${adb_revsrclist}" ] || [ -n "${rm_done}" ]
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then
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"${adb_uci}" -q set "adblock.global.adb_dnstoggle=on"
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/etc/init.d/dnsmasq restart
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sleep 1
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check="$(pgrep -f "dnsmasq")"
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if [ -n "${check}" ]
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then
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f_log "adblock lists with overall ${adb_count} domains loaded"
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else
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f_log "dnsmasq restart failed, retry without newly generated block lists"
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rm_done="$(find "${adb_dnsdir}" -maxdepth 1 -type f \( ${adb_revsrclist} \) -print -exec rm -f "{}" \;)"
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if [ -n "${rm_done}" ]
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then
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f_log "bogus adblock lists removed"
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f_rmconfig "${rm_done}"
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/etc/init.d/dnsmasq restart
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sleep 1
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check="$(pgrep -f "dnsmasq")"
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if [ -n "${check}" ]
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then
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f_cntconfig
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f_log "adblock lists with overall ${adb_count} domains loaded"
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else
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rc=100
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f_log "dnsmasq restart failed, please check 'logread' output" "${rc}"
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f_exit
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fi
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fi
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fi
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else
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f_log "adblock lists with overall ${adb_count} domains are still valid, no update required"
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fi
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# remove temporary files and exit
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#
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f_exit
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