235 lines
9.5 KiB
Bash
235 lines
9.5 KiB
Bash
#!/bin/sh /etc/rc.common
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PKG_VERSION=
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export START=94
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export USE_PROCD=1
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readonly A_TMP='/var/hosts.allowed.tmp'
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readonly B_TMP='/var/hosts.blocked.tmp'
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readonly T_TMP='/var/simple-adblock.hosts'
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readonly dl='wget --no-check-certificate -qO-'
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readonly h_filter='/localhost/d;/^#/d;/^[^0-9]/d;s/^0\.0\.0\.0.//;s/^127\.0\.0\.1.//;s/[[:space:]]*#.*$//;s/[[:cntrl:]]$//;s/[[:space:]]//g;/[`~!@#\$%\^&\*()=+;:"'\'',<>?/\|[{}]/d;/]/d;/\./!d;/^$/d;'
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readonly d_filter='/^#/d;s/[[:space:]]*#.*$//;s/[[:space:]]*$//;s/[[:cntrl:]]$//;/[[:space:]]/d;/[`~!@#\$%\^&\*()=+;:"'\'',<>?/\|[{}]/d;/]/d;/\./!d;/^$/d;'
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readonly f_filter='s|^|local=/|;s|$|/|'
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readonly _OK_='\033[0;32m\xe2\x9c\x93\033[0m'
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readonly _FAIL_='\033[0;31m\xe2\x9c\x97\033[0m'
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readonly __OK__='\033[0;32m[\xe2\x9c\x93]\033[0m'
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readonly __FAIL__='\033[0;31m[\xe2\x9c\x97]\033[0m'
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readonly _ERROR_='\033[0;31mERROR\033[0m'
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export EXTRA_COMMANDS="check killcache"
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export EXTRA_HELP=" check Checks if specified <string> is found in current blacklist"
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readonly packageName='simple-adblock'
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readonly serviceName="$packageName $PKG_VERSION"
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ok() { case $verbosity in 1) output "$_OK_";; 2) output "$__OK__\n";; esac; }
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okn() { case $verbosity in 1) output "$_OK_\n";; 2) output "$__OK__\n";; esac; }
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fail() { case $verbosity in 1) output "$_FAIL_";; 2) output "$__FAIL__\n";; esac; }
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failn() { case $verbosity in 1) output "$_FAIL_\n";; 2) output "$__FAIL__\n";; esac; }
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output() { [[ $# -ne 1 ]] && { [[ ! $((verbosity & $1)) -gt 0 ]] && return 0 || shift; }; local msg; msg=$(echo -n "${1/$serviceName /service }" | sed 's|\\033\[[0-9]\?;\?[0-9]\?[0-9]\?m||g'); [[ -t 1 ]] && echo -e -n "$1"; [[ $(echo -e -n "$msg" | wc -l) -gt 0 ]] && logger -t "${packageName:-service} [$$]" "$(echo -e -n ${logmsg}${msg})" && logmsg='' || logmsg=${logmsg}${msg}; }
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led_on(){ [[ -n "$led" && -e "$led/trigger" ]] && echo "default-on" > "$led/trigger"; }
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led_off(){ [[ -n "$led" && -e "$led/trigger" ]] && echo "none" > "$led/trigger"; }
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export serviceEnabled verbosity force_dns debug led wan_if wan_gw wanphysdev hosts_file
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boot() { ( sleep 120 && rc_procd start_service && rc_procd service_triggers | cat &); }
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load_package_config() {
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config_load "$packageName"
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config_get_bool serviceEnabled 'config' 'enabled' 1
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config_get_bool force_dns 'config' 'force_dns' 1
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config_get_bool debug 'config' 'debug' 0
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config_get verbosity 'config' 'verbosity' '2'
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config_get hosts_file 'config' 'hosts_file' "/var/dnsmasq.d/${packageName}"
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config_get led 'config' 'led'
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source /lib/functions/network.sh
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}
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is_enabled() {
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local sleepCount=1
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load_package_config
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if [ "$debug" -ne 0 ]; then
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exec 1>>/tmp/simple-adblock.log
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exec 2>&1
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set -x
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fi
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led="${led:+/sys/class/leds/$led}"
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[ $serviceEnabled -gt 0 ] || return 1
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while : ; do
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network_flush_cache; network_find_wan wan_if; network_get_gateway wan_gw $wan_if;
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[[ $sleepCount -ge 25 || -n "$wan_gw" ]] && break
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output "$serviceName waiting for wan gateway...\n"; sleep 2; let "sleepCount+=1";
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done
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[ -n "$wan_gw" ] && return 0
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output "$_ERROR_: $serviceName failed to discover WAN gateway.\n"; return 1;
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}
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iptables_destroy() {
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[ $force_dns -eq 0 ] && return 0
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[ -z "$packageName" ] && return 1
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iptables-save | grep -Fv -- "$packageName" | iptables-restore
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lsmod | grep -q ip6table_nat && ip6tables-save | grep -Fv -- "$packageName" | ip6tables-restore
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[ -z "$1" ] && output 'No longer forcing local DNS server.\n'
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}
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iptables_create() {
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local ip ipv6 label ipv6wan brname
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network_get_ipaddr ip lan; network_get_ipaddr6 ipv6 lan; network_get_device brname lan; network_get_physdev wanphysdev wan;
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ipv6wan=$(ifconfig $wanphysdev | grep inet6 | awk '{print $3}')
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iptables_destroy 'quiet'
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if [ $force_dns -ne 0 ]; then
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[ -n "$ip" ] && iptables -t nat -A prerouting_rule -i $brname -p tcp --dport 53 -j DNAT --to $ip -m comment --comment "$packageName"
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[ -n "$ip" ] && iptables -t nat -A prerouting_rule -i $brname -p udp --dport 53 -j DNAT --to $ip -m comment --comment "$packageName"
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if [[ -n "$ipv6" && -n "$ipv6wan" ]] && lsmod | grep -q ip6table_nat; then
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ip6tables -t nat -A PREROUTING -i $brname -p tcp --dport 53 -j DNAT --to-destination [$ipv6] -m comment --comment "$packageName"
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ip6tables -t nat -A PREROUTING -i $brname -p udp --dport 53 -j DNAT --to-destination [$ipv6] -m comment --comment "$packageName"
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label="$ip/$ipv6"
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else
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label="$ip"
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fi
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if [ -z "$1" ]; then
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if [ -n "$label" ]; then
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output "Forcing local DNS server: $label.\n"
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else
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output "$_ERROR_: $serviceName failed to obtain LAN IP address for DNS forcing!\n"
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fi
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fi
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fi
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}
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stop_adblocking() {
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load_package_config
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[ -f $hosts_file ] && mv $hosts_file $T_TMP
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output 3 "Restarting dnsmasq "
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led_off
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/etc/init.d/dnsmasq restart >/dev/null 2>&1
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if [[ $? -eq 0 ]]; then
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okn; output "$serviceName stopped.\n";
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else
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failn; output "$_ERROR_: $serviceName failed to reload dnsmasq!\n";
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fi
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}
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process_url() {
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local label type D_TMP R_TMP
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[[ -n "$1" && -n "$2" && -n "$3" ]] || return 1
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local url=$1
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[ "$2" == "hosts" ] && label="Hosts: $(echo $1 | cut -d'/' -f3)" filter="$h_filter" || label="Domains: $(echo $1 | cut -d'/' -f3)" filter="$d_filter"
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[ "$3" == "blocked" ] && { type='Blocked'; D_TMP="$B_TMP"; } || { type='Allowed'; D_TMP="$A_TMP"; }
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R_TMP="/var/simple-adblock_$(head -c40 /dev/urandom 2>/dev/null | tr -dc 'A-Za-z0-9' 2>/dev/null)"
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while [ -e "$R_TMP" ]; do R_TMP="/var/simple-adblock_$(head -c40 /dev/urandom 2>/dev/null | tr -dc 'A-Za-z0-9' 2>/dev/null)"; done
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touch "$R_TMP"
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output 2 "[DL] $type $label "
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$dl "${url}" > "$R_TMP" 2>/dev/null && ok || fail
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{ sed -i "$filter" "$R_TMP"; cat "$R_TMP" >> "$D_TMP"; rm -f "$R_TMP"; } &
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}
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start_adblocking() {
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local whitelist_domains blacklist_domains whitelist_domains_urls blacklist_domains_urls blacklist_hosts_urls
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config_get whitelist_domains 'config' 'whitelist_domain'
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config_get blacklist_domains 'config' 'blacklist_domain'
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config_get whitelist_domains_urls 'config' 'whitelist_domains_url'
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config_get blacklist_domains_urls 'config' 'blacklist_domains_url'
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config_get blacklist_hosts_urls 'config' 'blacklist_hosts_url'
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local hf w_filter
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[ ! -d ${hosts_file%/*} ] && mkdir -p ${hosts_file%/*}
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[ ! -f "$hosts_file" ] && touch "$hosts_file"
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if [[ -s $T_TMP && ! "$1" == "reload" ]]; then
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output 3 'Found existing data file, reusing it '
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mv $T_TMP $hosts_file && okn || failn
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else
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[ -f $A_TMP ] && rm -f $A_TMP; [ -f $B_TMP ] && rm -f $B_TMP; [ -f $T_TMP ] && rm -f $T_TMP; [ -f $hosts_file ] && rm -f $hosts_file;
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if [ "$(awk '/^MemFree/ {print int($2/1000)}' "/proc/meminfo")" -lt 32 ]; then
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output 1 'Low free memory, restarting dnsmasq...'
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/etc/init.d/dnsmasq restart >/dev/null 2>&1 && okn || failn
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fi
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touch $A_TMP; touch $B_TMP; touch $T_TMP;
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if [ -n "$blacklist_hosts_urls" ]; then
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output 1 '[DL] Blocked Hosts '
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for hf in ${blacklist_hosts_urls}; do process_url "$hf" 'hosts' 'blocked'; done
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output 1 '\n'
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fi
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if [ -n "$blacklist_domains_urls" ]; then
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output 1 '[DL] Blocked Domains '
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for hf in ${blacklist_domains_urls}; do process_url "$hf" 'domains' 'blocked'; done
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output 1 '\n'
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fi
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if [ -n "$whitelist_domains_urls" ]; then
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output 1 '[DL] Allowed Domains '
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for hf in ${whitelist_domains_urls}; do process_url "$hf" 'domains' 'allowed'; done
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output 1 '\n'
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fi
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output 3 'Waiting for background processes '
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wait && okn
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[ -n "$blacklist_domains" ] && for hf in ${blacklist_domains}; do echo "$hf" | sed "$d_filter" >> $B_TMP; done
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whitelist_domains="${whitelist_domains}"$'\n'"$(cat $A_TMP)"
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[ -n "$whitelist_domains" ] && for hf in ${whitelist_domains}; do hf=$(echo $hf | sed 's/\./\\./g'); w_filter="$w_filter/^${hf}$/d;/\\.${hf}$/d;"; done
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if [ -s $B_TMP ]; then
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output 1 'Processing downloads '
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output 2 'Sorting merged file '; sort $B_TMP | uniq > $T_TMP && ok || fail
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output 2 'Whitelisting domains '; sed -i "$w_filter" $T_TMP && ok || fail
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output 2 'Formatting merged file '; sed "$f_filter" $T_TMP > $B_TMP && mv $B_TMP $hosts_file && ok || fail
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output 1 '\n'
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output 3 'Removing temporary files '
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[ -f $A_TMP ] && rm -f $A_TMP; [ -f $B_TMP ] && rm -f $B_TMP; [ -f $T_TMP ] && rm -f $T_TMP;
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okn
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fi
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fi
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if [ -s $hosts_file ]; then
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output 3 'Restarting dnsmasq '
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/etc/init.d/dnsmasq restart >/dev/null 2>&1
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if [[ $? -eq 0 ]]; then
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led_on; okn;
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output "$serviceName blocking $(wc -l < $hosts_file) domains $_OK_\n"
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else
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failn; output "$_ERROR_: $serviceName failed to reload dnsmasq!\n";
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exit 1
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fi
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else
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output "$_ERROR_: $serviceName failed to create its data file!\n"
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exit 1
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fi
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}
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check() {
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load_package_config
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local string="$1"
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if [ ! -f $hosts_file ]; then
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echo "No local blacklist ($hosts_file) found."
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elif [ -z "$string" ]; then
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echo "Usage: /etc/init.d/${serviceName} check <string>"
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elif grep -m1 -q $string $hosts_file; then
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echo "Found $(grep $string $hosts_file | wc -l) matches for $string in $hosts_file:"
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grep $string $hosts_file | sed 's|local=/||;s|/$||;'
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else
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echo "The $string is not found in current blacklist."
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fi
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}
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start_service() {
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is_enabled || return 1
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if [ -f "$hosts_file" ]; then
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output "Reloading $serviceName...\n"
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iptables_create 'quiet'
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start_adblocking 'reload'
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else
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output "Starting $serviceName...\n"
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iptables_create
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start_adblocking
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fi
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}
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stop_service() {
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load_package_config
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output "Stopping $serviceName...\n"
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iptables_destroy
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stop_adblocking
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}
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killcache() { [ -s $T_TMP ] && rm -f $T_TMP; }
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