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615 lines
18 KiB
615 lines
18 KiB
#!/bin/sh
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# function library used by adblock-update.sh
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# written by Dirk Brenken (openwrt@brenken.org)
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# f_envload: load adblock environment
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#
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f_envload()
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{
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# source in openwrt function library
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#
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if [ -r "/lib/functions.sh" ]
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then
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. "/lib/functions.sh"
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else
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rc=110
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f_log "openwrt function library not found" "${rc}"
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f_exit
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fi
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# source in openwrt network library
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#
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if [ -r "/lib/functions/network.sh" ]
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then
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. "/lib/functions/network.sh"
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else
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rc=115
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f_log "openwrt network library not found" "${rc}"
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f_exit
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fi
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# set initial defaults,
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# may be overwritten by setting appropriate adblock config options in global section of /etc/config/adblock
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#
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adb_lanif="lan"
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adb_nullport="65535"
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adb_nullipv4="192.0.2.1"
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adb_nullipv6="::ffff:c000:0201"
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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)}"
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adb_forcedns=1
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# function to 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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# function to parse 'service' and 'source' sections
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#
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parse_config()
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{
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local value opt section="${1}" options="adb_dir adb_src adb_src_rset adb_src_cat"
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config_get switch "${section}" "enabled"
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if [ "${switch}" = "1" ]
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then
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if [ "${section}" != "backup" ]
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then
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eval "adb_sources=\"${adb_sources} ${section}\""
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fi
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for opt in ${options}
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do
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config_get value "${section}" "${opt}"
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if [ -n "${value}" ]
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then
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eval "${opt}_${section}=\"${value}\""
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fi
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done
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fi
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}
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# check opkg availability
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#
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if [ -r "/var/lock/opkg.lock" ]
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then
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rc=-1
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f_log "adblock installation finished successfully, 'opkg' currently locked by package installer"
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f_exit
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fi
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# get list with all installed openwrt packages
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#
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pkg_list="$(opkg list-installed)"
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if [ -z "${pkg_list}" ]
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then
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rc=120
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f_log "empty openwrt package list" "${rc}"
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f_exit
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fi
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# load adblock config and start parsing functions
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#
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config_load adblock
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config_foreach parse_config service
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config_foreach parse_config source
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# check 'enabled' & 'version' config options
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#
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if [ -z "${adb_enabled}" ] || [ -z "${adb_cfgversion}" ] || [ "${adb_cfgversion}" != "${adb_scriptver%.*}" ]
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then
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rc=125
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f_log "no valid adblock configuration found, please merge latest changes from '/etc/config/adblock.opkg' manually" "${rc}"
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f_exit
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fi
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if [ $((adb_enabled)) -ne 1 ]
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then
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rc=-1
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f_log "adblock is currently disabled, please set adblock.global.adb_enabled=1' to use this service"
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f_exit
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fi
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# set more script defaults (can't be overwritten by adblock config options)
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#
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adb_minspace=12000
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adb_tmpfile="$(mktemp -tu)"
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adb_tmpdir="$(mktemp -p /tmp -d)"
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adb_dnsdir="/tmp/dnsmasq.d"
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adb_dnsprefix="adb_list"
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adb_fetch="/usr/bin/wget"
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unset adb_srclist adb_revsrclist adb_errsrclist
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# get lan ip addresses
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#
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network_get_ipaddr adb_ipv4 "${adb_lanif}"
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network_get_ipaddr6 adb_ipv6 "${adb_lanif}"
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if [ -z "${adb_ipv4}" ] && [ -z "${adb_ipv6}" ]
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then
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rc=135
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f_log "no valid IPv4/IPv6 configuration found (${adb_lanif}), please set 'adb_lanif' manually" "${rc}"
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f_exit
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fi
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}
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# f_envcheck: check/set environment prerequisites
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#
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f_envcheck()
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{
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local check
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# check logical update interfaces (with default route)
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#
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network_find_wan adb_wanif4
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network_find_wan6 adb_wanif6
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if [ -z "${adb_wanif4}" ] && [ -z "${adb_wanif6}" ]
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then
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adb_wanif4="true"
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f_log "no valid IPv4/IPv6 interface with default route found, IPv4 mode will be assumed"
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fi
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# check general package dependencies
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#
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f_depend "uhttpd"
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f_depend "wget"
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f_depend "iptables"
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f_depend "kmod-ipt-nat"
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# check ipv6 related package dependencies
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#
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if [ -n "${adb_wanif6}" ]
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then
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check="$(printf "${pkg_list}" | grep "^ip6tables -")"
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if [ -z "${check}" ]
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then
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f_log "package 'ip6tables' not found, IPv6 support will be disabled"
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unset adb_wanif6
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else
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check="$(printf "${pkg_list}" | grep "^kmod-ipt-nat6 -")"
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if [ -z "${check}" ]
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then
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f_log "package 'kmod-ipt-nat6' not found, IPv6 support will be disabled"
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unset adb_wanif6
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fi
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fi
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fi
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# check ca-certificates package and set fetch parms accordingly
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#
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fetch_parm="--no-config --quiet --tries=1 --no-cache --no-cookies --max-redirect=0 --dns-timeout=5 --connect-timeout=5 --read-timeout=5"
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check="$(printf "${pkg_list}" | grep "^ca-certificates -")"
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if [ -z "${check}" ]
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then
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fetch_parm="${fetch_parm} --no-check-certificate"
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fi
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# check adblock temp directory
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#
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if [ -n "${adb_tmpdir}" ] && [ -d "${adb_tmpdir}" ]
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then
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f_space "${adb_tmpdir}"
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if [ "${space_ok}" = "false" ]
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then
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if [ $((av_space)) -le 2000 ]
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then
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rc=140
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f_log "not enough free space in '${adb_tmpdir}' (avail. ${av_space} kb)" "${rc}"
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f_exit
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else
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f_log "not enough free space to handle all adblock list sources at once in '${adb_tmpdir}' (avail. ${av_space} kb)"
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fi
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fi
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else
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rc=145
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f_log "temp directory not found" "${rc}"
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f_exit
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fi
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# check memory
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#
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mem_total="$(awk '$1 ~ /^MemTotal/ {printf $2}' "/proc/meminfo")"
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mem_free="$(awk '$1 ~ /^MemFree/ {printf $2}' "/proc/meminfo")"
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mem_swap="$(awk '$1 ~ /^SwapTotal/ {printf $2}' "/proc/meminfo")"
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if [ $((mem_total)) -le 64000 ] && [ $((mem_swap)) -eq 0 ]
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then
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mem_ok="false"
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f_log "not enough free memory, overall sort processing will be disabled (total: ${mem_total}, free: ${mem_free}, swap: ${mem_swap})"
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else
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mem_ok="true"
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fi
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# check backup configuration
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#
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if [ -n "${adb_dir_backup}" ] && [ -d "${adb_dir_backup}" ]
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then
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f_space "${adb_dir_backup}"
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if [ "${space_ok}" = "false" ]
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then
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f_log "not enough free space in '${adb_dir_backup}'(avail. ${av_space} kb), backup/restore will be disabled"
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backup_ok="false"
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else
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f_log "backup/restore will be enabled"
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backup_ok="true"
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fi
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else
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backup_ok="false"
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f_log "backup/restore will be disabled"
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fi
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# check running dnsmasq instance & set defaults
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#
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rc="$(ps | grep -q "[d]nsmasq"; printf ${?})"
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if [ $((rc)) -eq 0 ]
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then
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if [ -n "${adb_wanif4}" ] && [ -n "${adb_wanif6}" ]
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then
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adb_dnsformat="awk -v ipv4="${adb_nullipv4}" -v ipv6="${adb_nullipv6}" '{print \"address=/\"\$0\"/\"ipv4\"\n\"\"address=/\"\$0\"/\"ipv6}'"
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elif [ -n "${adb_wanif4}" ]
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then
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adb_dnsformat="awk -v ipv4="${adb_nullipv4}" '{print \"address=/\"\$0\"/\"ipv4}'"
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else
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adb_dnsformat="awk -v ipv6="${adb_nullipv6}" '{print \"address=/\"\$0\"/\"ipv6}'"
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fi
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else
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rc=150
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f_log "please enable the local dns server to use adblock" "${rc}"
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f_exit
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fi
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# check running firewall
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#
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check="$(/usr/sbin/iptables -vnL | grep -F "DROP")"
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if [ -z "${check}" ]
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then
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rc=155
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f_log "please enable the local firewall to use adblock" "${rc}"
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f_exit
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fi
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# check ipv4/iptables configuration
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#
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if [ -n "${adb_wanif4}" ]
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then
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f_firewall "IPv4" "nat" "A" "prerouting_rule" "adb-nat" "-p tcp -d ${adb_nullipv4} -m multiport --dports 80,443 -j DNAT --to-destination ${adb_ipv4}:${adb_nullport}"
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f_firewall "IPv4" "filter" "A" "forwarding_rule" "adb-fwd" "-p tcp -d ${adb_nullipv4} -j REJECT --reject-with tcp-reset"
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f_firewall "IPv4" "filter" "A" "forwarding_rule" "adb-fwd" "-d ${adb_nullipv4} -j REJECT --reject-with icmp-host-unreachable"
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f_firewall "IPv4" "filter" "A" "output_rule" "adb-out" "-p tcp -d ${adb_nullipv4} -j REJECT --reject-with tcp-reset"
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f_firewall "IPv4" "filter" "A" "output_rule" "adb-out" "-d ${adb_nullipv4} -j REJECT --reject-with icmp-host-unreachable"
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if [ $((adb_forcedns)) -eq 1 ]
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then
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f_firewall "IPv4" "nat" "A" "prerouting_rule" "adb-dns" "-p udp --dport 53 -j DNAT --to-destination ${adb_ipv4}:53"
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f_firewall "IPv4" "nat" "A" "prerouting_rule" "adb-dns" "-p tcp --dport 53 -j DNAT --to-destination ${adb_ipv4}:53"
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fi
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if [ "${fw_done}" = "true" ]
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then
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f_log "created volatile IPv4 firewall ruleset"
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fw_done="false"
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fi
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fi
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# check ipv6/ip6tables configuration
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#
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if [ -n "${adb_wanif6}" ]
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then
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f_firewall "IPv6" "nat" "A" "PREROUTING" "adb-nat" "-p tcp -d ${adb_nullipv6} -m multiport --dports 80,443 -j DNAT --to-destination [${adb_ipv6}]:${adb_nullport}"
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f_firewall "IPv6" "filter" "A" "forwarding_rule" "adb-fwd" "-p tcp -d ${adb_nullipv6} -j REJECT --reject-with tcp-reset"
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f_firewall "IPv6" "filter" "A" "forwarding_rule" "adb-fwd" "-d ${adb_nullipv6} -j REJECT --reject-with icmp6-addr-unreachable"
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f_firewall "IPv6" "filter" "A" "output_rule" "adb-out" "-p tcp -d ${adb_nullipv6} -j REJECT --reject-with tcp-reset"
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f_firewall "IPv6" "filter" "A" "output_rule" "adb-out" "-d ${adb_nullipv6} -j REJECT --reject-with icmp6-addr-unreachable"
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if [ $((adb_forcedns)) -eq 1 ]
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then
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f_firewall "IPv6" "nat" "A" "PREROUTING" "adb-dns" "-p udp --dport 53 -j DNAT --to-destination [${adb_ipv6}]:53"
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f_firewall "IPv6" "nat" "A" "PREROUTING" "adb-dns" "-p tcp --dport 53 -j DNAT --to-destination [${adb_ipv6}]:53"
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fi
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if [ "${fw_done}" = "true" ]
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then
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f_log "created volatile IPv6 firewall ruleset"
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fw_done="false"
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fi
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fi
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# check volatile adblock uhttpd instance configuration
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#
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rc="$(ps | grep -q "[u]httpd.*\-h /www/adblock"; printf ${?})"
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if [ $((rc)) -ne 0 ]
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then
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if [ -n "${adb_wanif4}" ] && [ -n "${adb_wanif6}" ]
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then
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uhttpd -h "/www/adblock" -k 0 -N 100 -t 0 -T 1 -D -S -E "/index.html" -p "${adb_ipv4}:${adb_nullport}" -p "[${adb_ipv6}]:${adb_nullport}"
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rc=${?}
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elif [ -n "${adb_wanif4}" ]
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then
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uhttpd -h "/www/adblock" -k 0 -N 100 -t 0 -T 1 -D -S -E "/index.html" -p "${adb_ipv4}:${adb_nullport}"
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rc=${?}
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else
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uhttpd -h "/www/adblock" -k 0 -N 100 -t 0 -T 1 -D -S -E "/index.html" -p "[${adb_ipv6}]:${adb_nullport}"
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rc=${?}
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fi
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if [ $((rc)) -eq 0 ]
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then
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f_log "created volatile uhttpd instance"
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else
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f_log "failed to initialize volatile uhttpd instance" "${rc}"
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f_restore
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fi
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fi
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# check 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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# remove no longer used opkg package list
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#
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unset pkg_list
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}
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# f_depend: check package dependencies
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#
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f_depend()
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{
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local check
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local package="${1}"
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check="$(printf "${pkg_list}" | grep "^${package} -")"
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if [ -z "${check}" ]
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then
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rc=160
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f_log "package '${package}' not found" "${rc}"
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f_exit
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fi
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}
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# f_firewall: set iptables rules for ipv4/ipv6
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#
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f_firewall()
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{
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local ipt
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local iptv4="/usr/sbin/iptables"
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local iptv6="/usr/sbin/ip6tables"
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local proto="${1}"
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local table="${2}"
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local ctype="${3}"
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local chain="${4}"
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local notes="${5}"
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local rules="${6}"
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# select appropriate iptables executable
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#
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if [ "${proto}" = "IPv4" ]
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then
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ipt="${iptv4}"
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else
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ipt="${iptv6}"
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fi
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# check whether iptables rule already applied and proceed accordingly
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#
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rc="$("${ipt}" -w -t "${table}" -C "${chain}" -m comment --comment "${notes}" ${rules}; printf ${?})"
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if [ $((rc)) -ne 0 ]
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then
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"${ipt}" -w -t "${table}" -"${ctype}" "${chain}" -m comment --comment "${notes}" ${rules}
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rc=${?}
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if [ $((rc)) -eq 0 ]
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then
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fw_done="true"
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else
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f_log "failed to initialize volatile ${proto} firewall rule '${notes}'" "${rc}"
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f_exit
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fi
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fi
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}
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# f_log: log messages to stdout and syslog
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#
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f_log()
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{
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local log_parm
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local log_msg="${1}"
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local log_rc="${2}"
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local class="info "
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# check for terminal session
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#
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if [ -t 1 ]
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then
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log_parm="-s"
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fi
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# log to different output devices and set log class accordingly
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#
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if [ -n "${log_msg}" ]
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then
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if [ $((log_rc)) -gt 0 ]
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then
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class="error"
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log_rc=", rc: ${log_rc}"
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log_msg="${log_msg}${log_rc}"
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fi
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/usr/bin/logger ${log_parm} -t "adblock[${adb_pid}] ${class}" "${log_msg}" 2>&1
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fi
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}
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################################################
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# f_space: check mount points/space requirements
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#
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f_space()
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{
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local mp="${1}"
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if [ -d "${mp}" ]
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then
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av_space="$(df "${mp}" | tail -n1 | awk '{printf $4}')"
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if [ $((av_space)) -lt $((adb_minspace)) ]
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then
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space_ok="false"
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fi
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fi
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}
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# f_cntconfig: calculate counters in config
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#
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f_cntconfig()
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{
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local list
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local src_name
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local count=0
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local count_sum=0
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for list in $(ls -ASr "${adb_dnsdir}/${adb_dnsprefix}."*)
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do
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src_name="${list/*./}"
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count="$(wc -l < "${list}")"
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if [ -n "${adb_wanif4}" ] && [ -n "${adb_wanif6}" ]
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then
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count=$((count / 2))
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fi
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uci_set "adblock" "${src_name}" "adb_src_count" "${count}"
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count_sum=$((count_sum + count))
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done
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uci_set "adblock" "global" "adb_overall_count" "${count_sum}"
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}
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# f_rmconfig: remove counters & timestamps in given config sections
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#
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f_rmconfig()
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{
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local rm_done="${1}"
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for list in ${rm_done}
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do
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src_name="${list/*./}"
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if [ -n "${restore_done}" ]
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then
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uci_set "adblock" "${src_name}" "adb_src_timestamp" "list restored"
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else
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uci_remove "adblock" "${src_name}" "adb_src_count"
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uci_remove "adblock" "${src_name}" "adb_src_timestamp"
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fi
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done
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unset restore_done
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}
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# f_restore: restore last adblock list backups and restart dnsmasq
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#
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f_restore()
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{
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local rm_done
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local restore_done
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# remove bogus adblock lists
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#
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if [ -n "${adb_revsrclist}" ]
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then
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rm_done="$(find "${adb_dnsdir}" -maxdepth 1 -type f \( ${adb_revsrclist} \) -print -exec rm -f "{}" \;)"
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rc=${?}
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if [ $((rc)) -eq 0 ] && [ -n "${rm_done}" ]
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then
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f_rmconfig "${rm_done}"
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f_log "all bogus adblock lists removed"
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elif [ $((rc)) -ne 0 ]
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then
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f_log "error during removal of bogus adblock lists" "${rc}"
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f_exit
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fi
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fi
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# restore backups
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#
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if [ "${backup_ok}" = "true" ]
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then
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restore_done="$(find "${adb_dir_backup}" -maxdepth 1 -type f -name "${adb_dnsprefix}.*" -print -exec cp -pf "{}" "${adb_dnsdir}" \;)"
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rc=${?}
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if [ $((rc)) -eq 0 ] && [ -n "${restore_done}" ]
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then
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f_log "all available backups restored"
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elif [ $((rc)) -ne 0 ] && [ -n "${restore_done}" ]
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then
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f_log "error during restore of adblock lists" "${rc}"
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f_exit
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fi
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else
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f_log "backup service disabled, nothing to restore"
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fi
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# (re-)try dnsmasq restart without bogus adblock lists / with backups
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#
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if [ -n "${restore_done}" ] || [ -n "${rm_done}" ]
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then
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/etc/init.d/dnsmasq restart
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|
sleep 1
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rc="$(ps | grep -q "[d]nsmasq"; printf ${?})"
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if [ $((rc)) -eq 0 ]
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then
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rc=0
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f_cntconfig
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f_log "adblock lists with overall ${adb_count} domains loaded"
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else
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rc=165
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f_log "dnsmasq restart failed, please check 'logread' output" "${rc}"
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|
fi
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fi
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f_exit
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}
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|
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# f_exit: delete (temporary) files, generate statistics and exit
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|
#
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|
f_exit()
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|
{
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local ipv4_adblock=0
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|
local ipv6_adblock=0
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|
local iptv4="/usr/sbin/iptables"
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|
local iptv6="/usr/sbin/ip6tables"
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|
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# delete temporary files & directories
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|
#
|
|
if [ -f "${adb_tmpfile}" ]
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|
then
|
|
rm -f "${adb_tmpfile}"
|
|
fi
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if [ -d "${adb_tmpdir}" ]
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|
then
|
|
rm -rf "${adb_tmpdir}"
|
|
fi
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|
|
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# final log message and iptables statistics
|
|
#
|
|
if [ $((rc)) -eq 0 ]
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|
then
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|
if [ -n "${adb_wanif4}" ]
|
|
then
|
|
ipv4_adblock="$(${iptv4} -t nat -vnL | awk '$11 ~ /^adb-nat$/ {sum += $1} END {printf sum}')"
|
|
ipv4_adblock="$((${ipv4_adblock} + $(${iptv4} -vnL | awk '$11 ~ /^adb-(fwd|out)$/ {sum += $1} END {printf sum}')))"
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|
fi
|
|
if [ -n "${adb_wanif6}" ]
|
|
then
|
|
ipv6_adblock="$(${iptv6} -t nat -vnL | awk '$10 ~ /^adb-nat$/ {sum += $1} END {printf sum}')"
|
|
ipv6_adblock="$((${ipv6_adblock} + $(${iptv6} -vnL | awk '$10 ~ /^adb-(fwd|out)$/ {sum += $1} END {printf sum}')))"
|
|
fi
|
|
if [ -n "$(uci changes adblock)" ]
|
|
then
|
|
uci_commit "adblock"
|
|
fi
|
|
f_log "firewall statistics (IPv4/IPv6): ${ipv4_adblock}/${ipv6_adblock} ad related packets blocked"
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|
f_log "domain adblock processing finished successfully (${adb_scriptver}, ${openwrt_version}, $(/bin/date "+%d.%m.%Y %H:%M:%S"))"
|
|
elif [ $((rc)) -gt 0 ]
|
|
then
|
|
f_log "domain adblock processing failed (${adb_scriptver}, ${openwrt_version}, $(/bin/date "+%d.%m.%Y %H:%M:%S"))"
|
|
else
|
|
rc=0
|
|
fi
|
|
rm -f "${adb_pidfile}"
|
|
exit ${rc}
|
|
}
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