#!/bin/sh /etc/rc.common
# Copyright 2017-2020 Stan Grishin (stangri@melmac.net)
# shellcheck disable=SC2039,SC1091,SC2016
PKG_VERSION='dev-test'

# shellcheck disable=SC2034
START=94
# shellcheck disable=SC2034
USE_PROCD=1
LC_ALL=C

extra_command 'check' 'Checks if specified domain is found in current block-list'
extra_command 'dl' 'Force-downloads all enabled block-list'
extra_command 'killcache' 'Delete all cached files'
extra_command 'sizes' 'Displays the file-sizes of enabled block-listo'
extra_command 'show' 'Shows the service last-run status'
extra_command 'version' 'Show version information'

readonly packageName='simple-adblock'
readonly serviceName="$packageName $PKG_VERSION"
readonly addnhostsFile="/var/run/${packageName}.addnhosts"
readonly addnhostsCache="/var/run/${packageName}.addnhosts.cache"
readonly addnhostsGzip="/etc/${packageName}.addnhosts.gz"
readonly addnhostsOutputFilter='s|^|127.0.0.1 |;s|$||'
readonly addnhostsOutputFilterIPv6='s|^|:: |;s|$||'
readonly dnsmasqFile="/var/dnsmasq.d/${packageName}"
readonly dnsmasqCache="/var/run/${packageName}.dnsmasq.cache"
readonly dnsmasqGzip="/etc/${packageName}.dnsmasq.gz"
readonly dnsmasqOutputFilter='s|^|local=/|;s|$|/|'
readonly ipsetFile="/var/dnsmasq.d/${packageName}.ipset"
readonly ipsetCache="/var/run/${packageName}.ipset.cache"
readonly ipsetGzip="/etc/${packageName}.ipset.gz"
readonly ipsetOutputFilter='s|^|ipset=/|;s|$|/adb|'
readonly serversFile="/var/run/${packageName}.servers"
readonly serversCache="/var/run/${packageName}.servers.cache"
readonly serversGzip="/etc/${packageName}.servers.gz"
readonly serversOutputFilter='s|^|server=/|;s|$|/|'
readonly unboundFile="/var/lib/unbound/adb_list.${packageName}"
readonly unboundCache="/var/run/${packageName}.unbound.cache"
readonly unboundGzip="/etc/${packageName}.unbound.gz"
readonly unboundOutputFilter='s|^|local-zone: "|;s|$|" static|'
readonly A_TMP="/var/${packageName}.hosts.a.tmp"
readonly B_TMP="/var/${packageName}.hosts.b.tmp"
readonly jsonFile="/var/run/${packageName}.json"
readonly sharedMemoryError="/dev/shm/$packageName-error"
readonly sharedMemoryOutput="/dev/shm/$packageName-output"
readonly hostsFilter='/localhost/d;/^#/d;/^[^0-9]/d;s/^0\.0\.0\.0.//;s/^127\.0\.0\.1.//;s/[[:space:]]*#.*$//;s/[[:cntrl:]]$//;s/[[:space:]]//g;/[`~!@#\$%\^&\*()=+;:"'\'',<>?/\|[{}]/d;/]/d;/\./!d;/^$/d;/[^[:alnum:]_.-]/d;'
readonly domainsFilter='/^#/d;s/[[:space:]]*#.*$//;s/[[:space:]]*$//;s/[[:cntrl:]]$//;/[[:space:]]/d;/[`~!@#\$%\^&\*()=+;:"'\'',<>?/\|[{}]/d;/]/d;/\./!d;/^$/d;/[^[:alnum:]_.-]/d;'
readonly _OK_='\033[0;32m\xe2\x9c\x93\033[0m'
readonly _FAIL_='\033[0;31m\xe2\x9c\x97\033[0m'
readonly __OK__='\033[0;32m[\xe2\x9c\x93]\033[0m'
readonly __FAIL__='\033[0;31m[\xe2\x9c\x97]\033[0m'
readonly _ERROR_='\033[0;31mERROR\033[0m'
readonly _WARNING_='\033[0;33mWARNING\033[0m'

version() { echo "$PKG_VERSION"; }

getStatusText() {
	local _ret
	case "$1" in
		statusNoInstall) _ret="$serviceName is not installed or not found";;
		statusStopped) _ret="Stopped";;
		statusStarting) _ret="Starting";;
		statusRestarting) _ret="Restarting";;
		statusForceReloading) _ret="Force Reloading";;
		statusDownloading) _ret="Downloading";;
		statusProcessing) _ret="Processing";;
		statusError) _ret="Error";;
		statusWarning) _ret="Warning";;
		statusFail) _ret="Fail";;
		statusSuccess) _ret="Success";;
	esac
	printf "%b" "$_ret"
}
getErrorText() {
	local _ret
	case "$1" in
		errorOutputFileCreate) _ret="failed to create $outputFile file";;
		errorFailDNSReload) _ret="failed to restart/reload DNS resolver";;
		errorSharedMemory) _ret="failed to access shared memory";;
		errorSorting) _ret="failed to sort data file";;
		errorOptimization) _ret="failed to optimize data file";;
		errorAllowListProcessing) _ret="failed to process allow-list";;
		errorDataFileFormatting) _ret="failed to format data file";;
		errorMovingDataFile) _ret="failed to move data file '${A_TMP}' to '${outputFile}'";;
		errorCreatingCompressedCache) _ret="failed to create compressed cache";;
		errorRemovingTempFiles) _ret="failed to remove temporary files";;
		errorRestoreCompressedCache) _ret="failed to unpack compressed cache";;
		errorRestoreCache) _ret="failed to move '$outputCache' to '$outputFile'";;
		errorOhSnap) _ret="failed to create block-list or restart DNS resolver";;
		errorStopping) _ret="failed to stop $serviceName";;
		errorDNSReload) _ret="failed to reload/restart DNS resolver";;
		errorDownloadingConfigUpdate) _ret="failed to download Config Update file";;
		errorDownloadingList) _ret="failed to download";;
		errorParsingList) _ret="failed to parse";;
		errorParsingConfigUpdate) _ret="failed to parse Config Update file";;
	esac
	printf "%b" "$_ret"
}

output_ok() { output 1 "$_OK_"; output 2 "$__OK__\\n"; }
output_okn() { output 1 "$_OK_\\n"; output 2 "$__OK__\\n"; }
output_fail() { output 1 "$_FAIL_"; output 2 "$__FAIL__\\n"; }
output_failn() { output 1 "$_FAIL_\\n"; output 2 "$__FAIL__\\n"; }
str_replace() { printf "%b" "$1" | sed -e "s/$(printf "%b" "$2")/$(printf "%b" "$3")/g"; }
str_contains() { test "$1" != "$(str_replace "$1" "$2" '')"; }
compare_values() { test "$(printf '%s\n' "$@" | sort -V | head -n 1)" != "$1"; }
is_chaos_calmer() { ubus -S call system board | grep -q 'Chaos Calmer'; }
led_on(){ if [ -n "${1}" ] && [ -e "${1}/trigger" ]; then echo 'default-on' > "${1}/trigger" 2>&1; fi; }
led_off(){ if [ -n "${1}" ] &&  [ -e "${1}/trigger" ]; then echo 'none' > "${1}/trigger" 2>&1; fi; }
dnsmasq_hup() { killall -q -HUP dnsmasq; }
dnsmasq_kill() { killall -q -KILL dnsmasq; }
dnsmasq_restart() { /etc/init.d/dnsmasq restart >/dev/null 2>&1; }
unbound_restart() { /etc/init.d/unbound restart >/dev/null 2>&1; }
is_force_dns_active() { iptables-save | grep -q -w -- '--dport 53'; }
is_present() { command -v "$1" >/dev/null 2>&1; }

output() {
# Can take a single parameter (text) to be output at any verbosity
# Or target verbosity level and text to be output at specifc verbosity
	local msg memmsg logmsg
	if [ $# -ne 1 ]; then
		if [ $((verbosity & $1)) -gt 0 ] || [ "$verbosity" = "$1" ]; then shift; else return 0; fi
	fi
	[ -t 1 ] && printf "%b" "$1"
	msg="${1//$serviceName /service }";
	if [ "$(printf "%b" "$msg" | wc -l)" -gt 0 ]; then
		[ -s "$sharedMemoryOutput" ] && memmsg="$(cat "$sharedMemoryOutput")"
		logmsg="$(printf "%b" "${memmsg}${msg}" | sed 's/\x1b\[[0-9;]*m//g')"
		logger -t "${packageName:-service} [$$]" "$(printf "%b" "$logmsg")"
		rm -f "$sharedMemoryOutput"
	else
		printf "%b" "$msg" >> "$sharedMemoryOutput"
	fi
}

serviceEnabled=''; forceDNS=''; forceDNSPorts=''; parallelDL=''; debug='';
compressedCache=''; ipv6Enabled=''; configUpdateEnabled=''; configUpdateURL='';
bootDelay=''; dlTimeout=''; curlRetry=''; verbosity=''; led='';
targetDNS=''; dnsInstance=''; 
allowed_domains=''; allowed_domains_urls='';
blocked_domains=''; blocked_domains_urls=''; blocked_hosts_urls='';
dl_command=''; dl_flag=''; isSSLSupported=''; allowIDN='';
outputFilter=''; outputFilterIPv6=''; outputFile=''; outputGzip=''; outputCache='';
awk='awk';

load_package_config() {
	config_load "$packageName"
	config_get_bool serviceEnabled        'config' 'enabled' 1
	config_get_bool forceDNS              'config' 'force_dns' 1
	config_get_bool parallelDL            'config' 'parallel_downloads' 1
	config_get_bool debug                 'config' 'debug' 0
	config_get_bool compressedCache       'config' 'compressed_cache' 0
	config_get_bool ipv6Enabled           'config' 'ipv6_enabled' 0
	config_get_bool configUpdateEnabled   'config' 'config_update_enabled' 0
	config_get forceDNSPorts              'config' 'force_dns_port' '53 853'
	config_get bootDelay                  'config' 'boot_delay' '120'
	config_get dlTimeout                  'config' 'download_timeout' '20'
	config_get curlRetry                  'config' 'curl_retry' '3'
	config_get verbosity                  'config' 'verbosity' '2'
	config_get led                        'config' 'led'
	config_get targetDNS                  'config' 'dns' 'dnsmasq.servers'
	config_get dnsInstance                'config' 'dns_instance' '0'
	config_get allowed_domains            'config' 'allowed_domain'
	config_get allowed_domains_urls       'config' 'allowed_domains_url'
	config_get blocked_domains            'config' 'blocked_domain'
	config_get blocked_domains_urls       'config' 'blocked_domains_url'
	config_get blocked_hosts_urls         'config' 'blocked_hosts_url'
	config_get configUpdateURL            'config' 'config_update_url' 'https://cdn.jsdelivr.net/gh/openwrt/packages/net/simple-adblock/files/simple-adblock.conf.update'

	if [ "$targetDNS" != 'dnsmasq.addnhosts' ] && [ "$targetDNS" != 'dnsmasq.conf' ] && \
		 [ "$targetDNS" != 'dnsmasq.servers' ] && [ "$targetDNS" != 'unbound.adb_list' ] && \
		 [ "$targetDNS" != 'dnsmasq.ipset' ] ; then
		targetDNS='dnsmasq.servers'
	fi

	case "$targetDNS" in
		dnsmasq.addnhosts)
			outputFilter="$addnhostsOutputFilter"
			outputFile="$addnhostsFile"
			outputCache="$addnhostsCache"
			outputGzip="$addnhostsGzip"
			[ "$ipv6Enabled" -gt 0 ] && outputFilterIPv6="$addnhostsOutputFilterIPv6"
			rm -f "$dnsmasqFile" "$dnsmasqCache" "$dnsmasqGzip"
			rm -f "$ipsetFile" "$ipsetCache" "$ipsetGzip"
			rm -f "$serversFile" "$serversCache" "$serversGzip"
			rm -f "$unboundFile" "$unboundCache" "$unboundGzip"
			;;
		dnsmasq.conf)
			outputFilter="$dnsmasqOutputFilter"
			outputFile="$dnsmasqFile"
			outputCache="$dnsmasqCache"
			outputGzip="$dnsmasqGzip"
			rm -f "$addnhostsFile" "$addnhostsCache" "$addnhostsGzip"
			rm -f "$ipsetFile" "$ipsetCache" "$ipsetGzip"
			rm -f "$serversFile" "$serversCache" "$serversGzip"
			rm -f "$unboundFile" "$unboundCache" "$unboundGzip"
			;;
		dnsmasq.ipset)
			outputFilter="$ipsetOutputFilter"
			outputFile="$ipsetFile"
			outputCache="$ipsetCache"
			outputGzip="$ipsetGzip"
			rm -f "$dnsmasqFile" "$dnsmasqCache" "$dnsmasqGzip"
			rm -f "$addnhostsFile" "$addnhostsCache" "$addnhostsGzip"
			rm -f "$serversFile" "$serversCache" "$serversGzip"
			rm -f "$unboundFile" "$unboundCache" "$unboundGzip"
			;;
		dnsmasq.servers)
			outputFilter="$serversOutputFilter"
			outputFile="$serversFile"
			outputCache="$serversCache"
			outputGzip="$serversGzip"
			rm -f "$dnsmasqFile" "$dnsmasqCache" "$dnsmasqGzip"
			rm -f "$addnhostsFile" "$addnhostsCache" "$addnhostsGzip"
			rm -f "$ipsetFile" "$ipsetCache" "$ipsetGzip"
			rm -f "$unboundFile" "$unboundCache" "$unboundGzip"
			;;
		unbound.adb_list)
			outputFilter="$unboundOutputFilter"
			outputFile="$unboundFile"
			outputCache="$unboundCache"
			outputGzip="$unboundGzip"
			rm -f "$addnhostsFile" "$addnhostsCache" "$addnhostsGzip"
			rm -f "$dnsmasqFile" "$dnsmasqCache" "$dnsmasqGzip"
			rm -f "$ipsetFile" "$ipsetCache" "$ipsetGzip"
			rm -f "$serversFile" "$serversCache" "$serversGzip"
			;;
	esac
	if [ -z "${verbosity##*[!0-9]*}" ] || [ "$verbosity" -lt 0 ] || [ "$verbosity" -gt 2 ]; then
		verbosity=1
	fi
	. /lib/functions/network.sh
	. /usr/share/libubox/jshn.sh
	is_present 'gawk' && awk='gawk'
	if ! is_present '/usr/libexec/grep-gnu' || ! is_present '/usr/libexec/sed-gnu' || \
		! is_present '/usr/libexec/sort-coreutils' || ! is_present 'gawk'; then
			local s="opkg update; opkg --force-overwrite install"
			is_present 'gawk' || s="$s gawk"
			is_present '/usr/libexec/grep-gnu' || s="$s grep"
			is_present '/usr/libexec/sed-gnu' || s="$s sed"
			is_present '/usr/libexec/sort-coreutils' || s="$s coreutils-sort"
			output "$_WARNING_: Some recommended packages are missing, install them by running:\\n"
			output "$s;\\n"
	fi
	# Prefer curl because it supports the file:// scheme.
	if is_present 'curl'; then
		dl_command="curl --insecure --retry $curlRetry --connect-timeout $dlTimeout --silent"
		dl_flag="-o"
	elif is_present '/usr/libexec/wget-ssl'; then
		dl_command="/usr/libexec/wget-ssl --no-check-certificate --timeout $dlTimeout -q"
		dl_flag="-O"
	elif is_present wget && wget --version 2>/dev/null | grep -q "+https"; then
		dl_command="wget --no-check-certificate --timeout $dlTimeout -q"
		dl_flag="-O"
	else
		dl_command="uclient-fetch --no-check-certificate --timeout $dlTimeout -q"
		dl_flag="-O"
	fi
	led="${led:+/sys/class/leds/$led}"
	if curl --version 2>/dev/null | grep -q "https" \
		|| wget --version 2>/dev/null | grep -q "+https" \
		|| grep -q "libustream-mbedtls" /usr/lib/opkg/status \
		|| grep -q "libustream-openssl" /usr/lib/opkg/status \
		|| grep -q "libustream-wolfssl" /usr/lib/opkg/status; then
		isSSLSupported=1
	else
		unset isSSLSupported
	fi
}

is_enabled() {
	wan_if=''; wan_gw='';
	load_package_config

	if [ "$debug" -ne 0 ]; then
		exec 1>>/tmp/simple-adblock.log
		exec 2>&1
		set -x
	fi

	if [ "$serviceEnabled" -eq 0 ]; then
		case "$1" in
			on_start)
				output "$packageName is currently disabled.\\n"
				output "Run the following commands before starting service again:\\n"
				output "uci set ${packageName}.config.enabled='1'; uci commit $packageName;\\n"
				;;
		esac
		return 1
	fi

	case $targetDNS in
		dnsmasq.addnhosts | dnsmasq.conf | dnsmasq.ipset | dnsmasq.servers)
			if dnsmasq -v 2>/dev/null | grep -q 'no-IDN' || ! dnsmasq -v 2>/dev/null | grep -q -w 'IDN'; then
				allowIDN=0
			else
				allowIDN=1
			fi
			;;
		unbound.adb_list)
			allowIDN=1;;
	esac

	case $targetDNS in
		dnsmasq.ipset)
			if dnsmasq -v 2>/dev/null | grep -q 'no-ipset' || ! dnsmasq -v 2>/dev/null | grep -q -w 'ipset'; then
				output "$_ERROR_: DNSMASQ ipset support is enabled in $packageName, but DNSMASQ is either not installed or installed DNSMASQ does not support ipsets!\\n"
				targetDNS='dnsmasq.servers'
			fi
			if ! ipset help hash:net >/dev/null 2>&1; then
				output "$_ERROR_: DNSMASQ ipset support is enabled in $packageName, but ipset is either not installed or installed ipset does not support 'hash:net' type!\\n"
				targetDNS='dnsmasq.servers'
			fi
			;;
	esac

	[ ! -d "${outputFile%/*}" ] && mkdir -p "${outputFile%/*}"
	[ ! -d "${outputCache%/*}" ] && mkdir -p "${outputFile%/*}"
	[ ! -d "${outputGzip%/*}" ] && mkdir -p "${outputFile%/*}"
	cacheOps 'testGzip' && return 0
	network_flush_cache; network_find_wan wan_if; network_get_gateway wan_gw "$wan_if";
	[ -n "$wan_gw" ] && return 0
	output "$_ERROR_: $serviceName failed to discover WAN gateway.\\n"; return 1;
}

dnsmasqOps() {
	local cfg="$1" param="$2"
	case "$param" in
		dnsmasq.addnhosts)
			if [ "$(uci -q get dhcp."$cfg".serversfile)" = "$serversFile" ]; then
				uci -q del dhcp."$cfg".serversfile
			fi
			if ! uci -q get dhcp."$cfg".addnhosts | grep -q "$addnhostsFile"; then
				uci add_list dhcp."$cfg".addnhosts="$addnhostsFile"
			fi
			;;
		dnsmasq.conf|dnsmasq.ipset|unbound.adb_list|cleanup)
			uci -q del_list dhcp."$cfg".addnhosts="$addnhostsFile"
			if [ "$(uci -q get dhcp."$cfg".serversfile)" = "$serversFile" ]; then
				uci -q del dhcp."$cfg".serversfile
			fi
			;;
		dnsmasq.servers)
			uci -q del_list dhcp."$cfg".addnhosts="$addnhostsFile"
			if [ "$(uci -q get dhcp."$cfg".serversfile)" != "$serversFile" ]; then
				uci set dhcp."$cfg".serversfile="$serversFile"
			fi
			;;
	esac
}

dnsOps() {
	local param output_text i
	case $1 in
		on_start)
			if [ ! -s "$outputFile" ]; then
				jsonOps set status "statusFail"
				jsonOps add error "errorOutputFileCreate"
				output "$_ERROR_: $(getErrorText 'errorOutputFileCreate')!\\n"
				return 1
			fi

			config_load 'dhcp'
			if [ "$dnsInstance" = "*" ]; then
				config_foreach dnsmasqOps 'dnsmasq' "$targetDNS"
			elif [ -n "$dnsInstance" ]; then
				for i in $dnsInstance; do
					dnsmasqOps "@dnsmasq[$i]" "$targetDNS"
				done
			fi

			case "$targetDNS" in
				dnsmasq.addnhosts|dnsmasq.servers)
					param=dnsmasq_hup
					output_text='Reloading DNSMASQ'
					;;
				dnsmasq.conf|dnsmasq.ipset)
					param=dnsmasq_restart
					output_text='Restarting DNSMASQ'
					;;
				unbound.adb_list)
					param=unbound_restart
					output_text='Restarting Unbound'
					;;
			esac

			if [ -n "$(uci changes dhcp)" ]; then
				uci commit dhcp
				if [ "$param" = 'unbound_restart' ]; then
					param='dnsmasq_restart; unbound_restart;'
					output_text='Restarting Unbound/DNSMASQ'
				else
					param=dnsmasq_restart
					output_text='Restarting DNSMASQ'
				fi
			fi
			output 1 "$output_text "
			output 2 "$output_text "
			jsonOps set message "$output_text"
			if eval "$param"; then
				jsonOps set status "statusSuccess"
				led_on "$led"
				output_okn
			else 
				output_fail
				jsonOps set status "statusFail"
				jsonOps add error "errorDNSReload"
				output "$_ERROR_: $(getErrorText 'errorDNSReload')!\\n"
				return 1
			fi
			;;
		on_stop)
			case "$targetDNS" in
				dnsmasq.addnhosts | dnsmasq.servers)
					param=dnsmasq_hup
					;;
				dnsmasq.conf | dnsmasq.ipset)
					param=dnsmasq_restart
					;;
				unbound.adb_list)
					param=unbound_restart
					;;
			esac
			if [ -n "$(uci changes dhcp)" ]; then 
				uci -q commit dhcp
				if [ "$param" = 'unbound_restart' ]; then
					param='dnsmasq_restart; unbound_restart;'
				else
					param=dnsmasq_restart
				fi
			fi
			eval "$param"
			return $?
			;;
		quiet)
			case "$targetDNS" in
				dnsmasq.addnhosts | dnsmasq.conf | dnsmasq.ipset | dnsmasq.servers)
					param=dnsmasq_restart
					;;
				unbound.adb_list)
					param=unbound_restart
					;;
			esac
			eval "$param"
			return $?
			;;
	esac
}

jsonOps() {
# shellcheck disable=SC2034
	local action="$1" param="$2" value="$3"
	local status message error stats
	local reload restart curReload curRestart ret i
	if [ -s "$jsonFile" ]; then
		json_load_file "$jsonFile" 2>/dev/null
		json_select 'data' 2>/dev/null
		for i in status message error stats reload restart; do
			json_get_var $i "$i" 2>/dev/null
		done
	fi
	case "$action" in
		get)
			case "$param" in
				triggers)
					curReload="$parallelDL $debug $dlTimeout $allowed_domains $blocked_domains $allowed_domains_urls $blocked_domains_urls $blocked_hosts_urls $targetDNS $configUpdateEnabled $configUpdateURL"
					curRestart="$compressedCache $forceDNS $led $forceDNSPorts"
					if [ ! -s "$jsonFile" ]; then
						ret='on_boot'
					elif [ "$curReload" != "$reload" ]; then
						ret='download'
					elif [ "$curRestart" != "$restart" ]; then
						ret='restart'
					fi
					printf "%b" "$ret"
					return;;
				*)
					printf "%b" "$(eval echo "\$$param")"; return;;
			esac
			;;
		add)
			if [ -n "$(eval echo "\$$param")" ]; then
				value="$(eval echo "\$$param") ${value}"
			fi
				eval "$param"='${value}'
			;;
		del)
			case "$param" in
				all)
					unset status message error stats;;
				triggers) 
					unset reload restart;;
				*)
					unset "$param";;
			esac
			;;
		set)
			case "$param" in
				triggers) 
					reload="$parallelDL $debug $dlTimeout $allowed_domains $blocked_domains $allowed_domains_urls $blocked_domains_urls $blocked_hosts_urls $targetDNS $configUpdateEnabled $configUpdateURL"
					restart="$compressedCache $forceDNS $led $forceDNSPorts"
					;;
				*)
					eval "$param"='$value';;
			esac
			;;
	esac
	json_init
	json_add_object 'data'
	json_add_string version "$PKG_VERSION"
	json_add_string status "$status"
	json_add_string message "$message"
	json_add_string error "$error"
	json_add_string stats "$stats"
	json_add_string reload "$reload"
	json_add_string restart "$restart"
	json_close_object
	json_dump > "$jsonFile"
	sync
}

cacheOps() {
	local R_TMP
	case "$1" in
		create|backup)
			[ -s "$outputFile" ] && { mv -f "$outputFile" "$outputCache"; true > "$outputFile"; } >/dev/null 2>/dev/null
			return $?
			;;
		restore|use)
			[ -s "$outputCache" ] && mv "$outputCache" "$outputFile" >/dev/null 2>/dev/null
			return $?
			;;
		test)
			[ -s "$outputCache" ]
			return $?
			;;
		testGzip)
			[ -s "$outputGzip" ] && gzip -t -c "$outputGzip"
			return $?
			;;
		createGzip)
			R_TMP="$(mktemp -u -q -t ${packageName}_tmp.XXXXXXXX)"
			if gzip < "$outputFile" > "$R_TMP"; then
				if mv "$R_TMP" "$outputGzip"; then
					rm -f "$R_TMP"
					return 0
				else
					rm -f "$R_TMP"
					return 1
				fi
			else
				return 1
			fi
			;;
		expand|unpack|expandGzip|unpackGzip)
			[ -s "$outputGzip" ] && gzip -dc < "$outputGzip" > "$outputCache"
			return $?
			;;
	esac
}

process_url() {
	local label type D_TMP R_TMP
	if [ -z "$1" ] || [ -z "$2" ] || [ -z "$3" ]; then return 1; fi
	label="${1##*//}"; label="${label%%/*}";
	if [ "$2" = 'hosts' ]; then
		label="Hosts:   $label"; filter="$hostsFilter";
	else
		label="Domains: $label"; filter="$domainsFilter";
	fi
	if [ "$3" = 'blocked' ]; then
		type='Blocked'; D_TMP="$B_TMP";
	else
		type='Allowed'; D_TMP="$A_TMP";
	fi
	if [ "${1:0:5}" == "https" ] && [ -z "$isSSLSupported" ]; then
		output 1 "$_FAIL_"
		output 2 "[DL] $type $label $__FAIL__\\n"
		echo "errorNoSSLSupport|${1}" >> "$sharedMemoryError"
		return 0
	fi
	while [ -z "$R_TMP" ] || [ -e "$R_TMP" ]; do
		R_TMP="$(mktemp -u -q -t ${packageName}_tmp.XXXXXXXX)"
	done
	if ! $dl_command "$1" $dl_flag "$R_TMP" 2>/dev/null || [ ! -s "$R_TMP" ]; then
		output 1 "$_FAIL_"
		output 2 "[DL] $type $label $__FAIL__\\n"
		echo "errorDownloadingList|${1}" >> "$sharedMemoryError"
	else
		sed -i "$filter" "$R_TMP"
		if [ ! -s "$R_TMP" ]; then
			output 1 "$_FAIL_"
			output 2 "[DL] $type $label $__FAIL__\\n"
			echo "errorParsingList|${1}" >> "$sharedMemoryError"
		else
			cat "${R_TMP}" >> "$D_TMP"
			output 1 "$_OK_"
			output 2 "[DL] $type $label $__OK__\\n"
		fi
	fi
	rm -f "$R_TMP"
	return 0
}

process_config_update() {
	local label R_TMP
	[ "$configUpdateEnabled" -eq 0 ] && return 0
	label="${1##*//}"; label="${label%%/*}";
	while [ -z "$R_TMP" ] || [ -e "$R_TMP" ]; do
		R_TMP="$(mktemp -u -q -t ${packageName}_tmp.XXXXXXXX)"
	done
	if ! $dl_command "$1" $dl_flag "$R_TMP" 2>/dev/null || [ ! -s "$R_TMP" ]; then
		output 1 "$_FAIL_"
		output 2 "[DL] Config  Update:  $label $__FAIL__\\n"
		jsonOps add error "errorDownloadingConfigUpdate"
	else
		if [ -s "$R_TMP" ] && sed -f "$R_TMP" -i /etc/config/simple-adblock 2>/dev/null; then
			output 1 "$_OK_"
			output 2 "[DL] Config  Update:  $label $__OK__\\n"
		else
			output 1 "$_FAIL_"
			output 2 "[DL] Config  Update:  $label $__FAIL__\\n"
			jsonOps add error "errorParsingConfigUpdate"
		fi
	fi
	rm -f "$R_TMP"
	return 0
}

download_lists() {
	local hf w_filter j=0 R_TMP

	jsonOps set message "$(getStatusText "statusDownloading")..."
	jsonOps set status "statusDownloading"

	rm -f "$A_TMP" "$B_TMP" "$outputFile" "$outputCache" "$outputGzip"
	if [ "$($awk '/^MemFree/ {print int($2/1000)}' "/proc/meminfo")" -lt 32 ]; then
		output 3 'Low free memory, restarting resolver... '
		if dnsOps 'quiet'; then
			output_okn
		else 
			output_fail
		fi
	fi
	touch $A_TMP; touch $B_TMP;
	output 1 'Downloading lists '
	process_config_update "$configUpdateURL"
	rm -f "$sharedMemoryError"
	if [ -n "$blocked_hosts_urls" ]; then
		for hf in ${blocked_hosts_urls}; do
			if [ "$parallelDL" -gt 0 ]; then
				process_url "$hf" 'hosts' 'blocked' &
			else
				process_url "$hf" 'hosts' 'blocked'
			fi
		done
	fi
	if [ -n "$blocked_domains_urls" ]; then
		for hf in ${blocked_domains_urls}; do
			if [ "$parallelDL" -gt 0 ]; then
				process_url "$hf" 'domains' 'blocked' &
			else
				process_url "$hf" 'domains' 'blocked'
			fi
		done
	fi
	if [ -n "$allowed_domains_urls" ]; then
		for hf in ${allowed_domains_urls}; do
			if [ "$parallelDL" -gt 0 ]; then
				process_url "$hf" 'domains' 'allowed' &
			else
				process_url "$hf" 'domains' 'allowed'
			fi
		done
	fi
	wait
	output 1 '\n'
	if [ -s "$sharedMemoryError" ]; then
		while IFS= read -r line; do
			jsonOps add error "$line"
		done < "$sharedMemoryError"
		rm -f "$sharedMemoryError"
	fi

	[ -n "$blocked_domains" ] && for hf in ${blocked_domains}; do echo "$hf" | sed "$domainsFilter" >> $B_TMP; done
	allowed_domains="${allowed_domains}
$(cat $A_TMP)"
	[ -n "$allowed_domains" ] && for hf in ${allowed_domains}; do hf="$(echo "$hf" | sed 's/\./\\./g')"; w_filter="$w_filter/${hf}$/d;"; done

	[ ! -s "$B_TMP" ] && return 1

	output 1 'Processing downloads '
	output 2 'Sorting combined list '
	jsonOps set message "$(getStatusText "statusProcessing"): sorting combined list"
	if [ "$allowIDN" -gt 0 ]; then
		if sort -u "$B_TMP" > "$A_TMP"; then
			output_ok
		else
			output_failn
			jsonOps add error "errorSorting"
		fi
	else
		if sort -u "$B_TMP" | grep -E -v '[^a-zA-Z0-9=/.-]' > "$A_TMP"; then
			output_ok
		else
			output_failn
			jsonOps add error "errorSorting"
		fi
	fi

	if [ "$targetDNS" = 'dnsmasq.conf' ] || \
		 [ "$targetDNS" = 'dnsmasq.ipset' ] || \
		 [ "$targetDNS" = 'dnsmasq.servers' ] || \
		 [ "$targetDNS" = 'unbound.adb_list' ]; then
		# TLD optimization written by Dirk Brenken (dev@brenken.org)
		output 2 'Optimizing combined list '
		jsonOps set message "$(getStatusText "statusProcessing"): optimizing combined list"
# 	sed -E 'G;:t;s/(.*)(\.)(.*)(\n)(.*)/\1\4\5\2\3/;tt;s/(.*)\n(\.)(.*)/\3\2\1/' is actually slower than command below
		if $awk -F "." '{for(f=NF;f>1;f--)printf "%s.",$f;print $1}' "$A_TMP" > "$B_TMP"; then
			if sort "$B_TMP" > "$A_TMP"; then
				if $awk '{if(NR=1){tld=$NF};while(getline){if($NF!~tld"\\."){print tld;tld=$NF}}print tld}' "$A_TMP" > "$B_TMP"; then
					if $awk -F "." '{for(f=NF;f>1;f--)printf "%s.",$f;print $1}' "$B_TMP" > "$A_TMP"; then
						if sort -u "$A_TMP" > "$B_TMP"; then
							output_ok
						else
							output_failn
							jsonOps add error "errorOptimization"
							mv "$A_TMP" "$B_TMP"
						fi
					else
						output_failn
						jsonOps add error "errorOptimization"
					fi
				else
					output_failn
					jsonOps add error "errorOptimization"
					mv "$A_TMP" "$B_TMP"
				fi
			else
				output_failn
				jsonOps add error "errorOptimization"
			fi
		else
			output_failn
			jsonOps add error "errorOptimization"
			mv "$A_TMP" "$B_TMP"
		fi
	else
		mv "$A_TMP" "$B_TMP"
	fi

	output 2 'Allowing domains '
	jsonOps set message "$(getStatusText "statusProcessing"): allowing domains"
	if sed -i "$w_filter" "$B_TMP"; then
		output_ok
	else
		output_failn
		jsonOps add error "errorAllowListProcessing"
	fi

	output 2 'Formatting merged file '
	jsonOps set message "$(getStatusText "statusProcessing"): formatting merged file"
	if [ -z "$outputFilterIPv6" ]; then
		if sed "$outputFilter" "$B_TMP" > "$A_TMP"; then
			output_ok
		else
			output_failn
			jsonOps add error "errorDataFileFormatting"
		fi
	else
		case "$targetDNS" in
			dnsmasq.addnhosts)
				if sed "$outputFilter" "$B_TMP" > "$A_TMP" && \
					sed "$outputFilterIPv6" "$B_TMP" >> "$A_TMP"; then
					output_ok
				else
					output_failn
					jsonOps add error "errorDataFileFormatting"
				fi
				;;
		esac
	fi

	case "$targetDNS" in
		dnsmasq.addnhosts)
			output 2 'Creating DNSMASQ addnhosts file '
			jsonOps set message "$(getStatusText "statusProcessing"): creating DNSMASQ addnhosts file"
			;;
		dnsmasq.conf)
			output 2 'Creating DNSMASQ config file '
			jsonOps set message "$(getStatusText "statusProcessing"): creating DNSMASQ config file"
			;;
		dnsmasq.ipset)
			output 2 'Creating DNSMASQ ipset file '
			jsonOps set message "$(getStatusText "statusProcessing"): creating DNSMASQ ipset file"
			;;
		dnsmasq.servers)
			output 2 'Creating DNSMASQ servers file '
			jsonOps set message "$(getStatusText "statusProcessing"): creating DNSMASQ servers file"
			;;
		unbound.adb_list)
			output 2 'Creating Unbound adb_list file '
			jsonOps set message "$(getStatusText "statusProcessing"): creating Unbound adb_list file"
			;;
	esac
	if mv "$A_TMP" "$outputFile"; then
		output_ok
	else
		output_failn
		jsonOps add error "errorMovingDataFile"
	fi
	if [ "$compressedCache" -gt 0 ]; then
		output 2 'Creating compressed cache '
		jsonOps set message "$(getStatusText "statusProcessing"): creating compressed cache"
		if cacheOps 'createGzip'; then
			output_ok
		else
			output_failn
			jsonOps add error "errorCreatingCompressedCache"
		fi
	else
		rm -f "$outputGzip"
	fi
	output 2 'Removing temporary files '
	jsonOps set message "$(getStatusText "statusProcessing"): removing temporary files"
	rm -f "/tmp/${packageName}_tmp.*" "$A_TMP" "$B_TMP" "$outputCache" || j=1
	if [ $j -eq 0 ]; then
		output_ok
	else
		output_failn
		jsonOps add error "errorRemovingTempFiles"
	fi
	output 1 '\n'
}

boot() { 
	load_package_config
	sleep "$bootDelay"
	rc_procd start_service 'on_boot' && rc_procd service_triggers
}

start_service() {
	is_enabled 'on_start' || return 1
	local action status error message stats c

	status="$(jsonOps get status)"
	error="$(jsonOps get error)"
	message="$(jsonOps get message)"
	stats="$(jsonOps get stats)"
	action="$(jsonOps get triggers)"

	if [ "$action" = 'on_boot' ] || [ "$1" = 'on_boot' ]; then
		if cacheOps 'testGzip' || cacheOps 'test'; then
			action='restore'
		else
			action='download'
		fi
	elif [ "$action" = 'download' ] || [ "$1" = 'download' ] || [ -n "$error" ]; then
		action='download'
	elif [ ! -s "$outputFile" ]; then 
		if cacheOps 'testGzip' || cacheOps 'test'; then
			action='restore'
		else
			action='download'
		fi
	elif [ "$action" = 'restart' ] || [ "$1" = 'restart' ]; then
		action='restart'
	elif [ -s "$outputFile" ] && [ "$status" = "statusSuccess" ] && [ -z "$error" ]; then
		showstatus
		exit 0
	else
		action='download'
	fi

	jsonOps del all
	jsonOps set triggers

	procd_open_instance 'main'
	procd_set_param command /bin/true
	procd_set_param stdout 1
	procd_set_param stderr 1
	procd_open_data
	json_add_array firewall
	if [ "$forceDNS" -ne 0 ]; then
		for c in $forceDNSPorts; do
			if netstat -tuln | grep LISTEN | grep ":${c}" >/dev/null 2>&1; then
				json_add_object ""
				json_add_string type redirect
				json_add_string target DNAT
				json_add_string src lan
				json_add_string proto "tcp udp"
				json_add_string src_dport "$c"
				json_add_string dest_port "$c"
				json_add_boolean reflection 0
				json_close_object
			else
				json_add_object ""
				json_add_string type rule
				json_add_string src lan
				json_add_string dest "*"
				json_add_string proto "tcp udp"
				json_add_string dest_port "$c"
				json_add_string target REJECT
				json_close_object
			fi
		done
	fi
	if [ "$targetDNS" = 'dnsmasq.ipset' ]; then
		json_add_object ""
		json_add_string type ipset
		json_add_string name adb
		json_add_string match dest_net
		json_add_string storage hash
		json_close_object
		json_add_object ""
		json_add_string type rule
		json_add_string ipset adb
		json_add_string src lan
		json_add_string dest "*"
		json_add_string proto "tcp udp"
		json_add_string target REJECT
		json_close_object
	fi
	json_close_array
	procd_close_data
	procd_close_instance

	if [ "$action" = 'restore' ]; then
		output 0 "Starting $serviceName... "
		output 3 "Starting $serviceName...\\n"
		jsonOps set status "statusStarting"
		if cacheOps 'testGzip' && ! cacheOps 'test' && [ ! -s "$outputFile" ]; then
			output 3 'Found compressed cache file, unpacking it '
			jsonOps set message 'found compressed cache file, unpacking it.'
			if cacheOps 'unpackGzip'; then
				output_okn
			else
				output_fail
				jsonOps add error "errorRestoreCompressedCache"
				output "$_ERROR_: $(getErrorText 'errorRestoreCompressedCache')!\\n"
				action='download'
			fi
		fi
		if cacheOps 'test' && [ ! -s "$outputFile" ]; then
			output 3 'Found cache file, reusing it '
			jsonOps set message 'found cache file, reusing it.'
			if cacheOps 'restore'; then 
				output_okn
				dnsOps 'on_start'
			else
				output_fail
				jsonOps add error "errorRestoreCache"
				output "$_ERROR_: $(getErrorText 'errorRestoreCache')!\\n"
				action='download'
			fi
		fi
	fi
	if [ "$action" = 'download' ]; then
		if [ -s "$outputFile" ] || cacheOps 'test' || cacheOps 'testGzip'; then
			output 0 "Force-reloading $serviceName... "
			output 3 "Force-reloading $serviceName...\\n"
			jsonOps set status "statusForceReloading"
		else
			output 0 "Starting $serviceName... "
			output 3 "Starting $serviceName...\\n"
			jsonOps set status "statusStarting"
		fi
		download_lists
		dnsOps 'on_start'
	fi
	if [ "$action" = 'restart' ]; then
		output 0 "Restarting $serviceName... "
		output 3 "Restarting $serviceName...\\n"
		jsonOps set status "statusRestarting"
		dnsOps 'on_start'
	fi
	if [ "$action" = 'start' ]; then
		output 0 "Starting $serviceName... "
		output 3 "Starting $serviceName...\\n"
		jsonOps set status "statusStarting"
		dnsOps 'on_start'
	fi
	if [ -s "$outputFile" ] && [ "$(jsonOps get status)" != "statusFail" ]; then
		output 0 "$__OK__\\n";
		jsonOps del message
		jsonOps set status "statusSuccess"
		jsonOps set stats "$serviceName is blocking $(wc -l < "$outputFile") domains (with ${targetDNS})"
		showstatus
	else
		output 0 "$__FAIL__\\n";
		jsonOps set status "statusFail"
		jsonOps add error "errorOhSnap"
		showstatus
	fi
}

service_started() { procd_set_config_changed firewall; }
service_stopped() { procd_set_config_changed firewall; }

restart_service() { rc_procd start_service 'restart'; }
reload_service() { rc_procd start_service 'restart'; }
dl() { rc_procd start_service 'download'; }

killcache() {
	rm -f "$addnhostsCache" "$addnhostsGzip"
	rm -f "$dnsmasqCache" "$dnsmasqGzip"
	rm -f "$ipsetCache" "$ipsetGzip"
	rm -f "$serversCache" "$serversGzip"
	rm -f "$unboundCache" "$unboundGzip"
	config_load 'dhcp'
	config_foreach dnsmasqOps 'dnsmasq' 'cleanup'
	uci -q commit 'dhcp'
	return 0
}

show() { showstatus; }
status_service() { showstatus; }
showstatus() {
	local c url status message error stats
	status="$(jsonOps get status)"
	message="$(jsonOps get message)"
	error="$(jsonOps get error)"
	stats="$(jsonOps get stats)"
	if [ "$status" = "statusSuccess" ]; then
		output "$stats "; output_okn;
	else
		[ -n "$status" ] && status="$(getStatusText "$status")"
		if [ -n "$status" ] && [ -n "$message" ]; then 
			status="${status}: $message"
		fi
		[ -n "$status" ] && output "$serviceName $status\\n"
	fi
	if [ -n "$error" ]; then
		for c in $error; do
			url="${c##*|}"
			c="${c%|*}"
			case "$c" in
				errorDownloadingList|errorParsingList)
					output "$_ERROR_: $(getErrorText "$c") $url!\\n";;
				*)
					output "$_ERROR_: $(getErrorText "$c")!\\n";;
			esac
			let n=n+1
		done
	fi
}

stop_service() {
	load_package_config
	if [ -s "$outputFile" ]; then
		output "Stopping $serviceName... "
		cacheOps 'create'
		if dnsOps 'on_stop'; then
			led_off "$led"
			output 0 "$__OK__\\n"; output_okn;
			jsonOps set status "statusStopped"
			jsonOps del message
		else 
			output 0 "$__FAIL__\\n"; output_fail;
			jsonOps set status "statusFail"
			jsonOps add error "errorStopping"
			output "$_ERROR_: $(getErrorText 'errorStopping')!\\n"
		fi
	fi
}

service_triggers() {
	procd_open_trigger
	procd_add_config_trigger 'config.change' "${packageName}" /etc/init.d/${packageName} reload
	procd_add_reload_interface_trigger 'wan'
	procd_add_interface_trigger 'interface.*.up' 'wan' /etc/init.d/${packageName} reload
	procd_close_trigger
}

check() {
	load_package_config
	local c string="$1" 
	c="$(grep -c "$string" "$outputFile")"
	if [ ! -s "$outputFile" ]; then
		echo "No block-list ('$outputFile') found."
	elif [ -z "$string" ]; then
		echo "Usage: /etc/init.d/${packageName} check string"
	elif [ "$c" -gt 0 ]; then
		if [ "$c" -gt 1 ]; then
			echo "Found $c matches for '$string' in '$outputFile':"
		else
			echo "Found 1 match for '$string' in '$outputFile':"
		fi
		case "$targetDNS" in
			dnsmasq.addnhosts)
				grep "$string" "$outputFile" | sed 's|^127.0.0.1 ||;s|^:: ||;';;
			dnsmasq.conf)
				grep "$string" "$outputFile" | sed 's|local=/||;s|/$||;';;
			dnsmasq.ipset)
				grep "$string" "$outputFile" | sed 's|ipset=/||;s|/adb$||;';;
			dnsmasq.servers)
				grep "$string" "$outputFile" | sed 's|server=/||;s|/$||;';;
			unbound.adb_list)
				grep "$string" "$outputFile" | sed 's|^local-zone: "||;s|" static$||;';;
		esac
	else
		echo "The $string is not found in current block-list ('$outputFile')."
	fi
}

sizes() {
	local i
	load_package_config
	echo "# $(date)"

	for i in $blocked_domains_urls; do
		[ "${i//melmac}" != "$i" ] && continue
		if $dl_command "$i" $dl_flag /tmp/sast 2>/dev/null && [ -s /tmp/sast ]; then
			echo "# File size: $(du -sh /tmp/sast | $awk '{print $1}')"
			if compare_values "$(du -sk /tmp/sast)" "500"; then
				echo "# block-list too big for most routers"
			elif compare_values "$(du -sk /tmp/sast)" "100"; then
				echo "# block-list may be too big for some routers"
			fi
			rm -rf /tmp/sast
			echo "  list blocked_domains_url '$i'"
			echo ""
		else
			echo "# site was down on last check"
			echo "#  list blocked_domains_url '$i'"
			echo ""
		fi
	done

	for i in $blocked_hosts_urls; do
		if $dl_command "$i" $dl_flag /tmp/sast 2>/dev/null && [ -s /tmp/sast ]; then
			echo "# File size: $(du -sh /tmp/sast | $awk '{print $1}')"
			if compare_values "$(du -sk /tmp/sast)" "500"; then
				echo "# block-list too big for most routers"
			elif compare_values "$(du -sk /tmp/sast)" "100"; then
				echo "# block-list may be too big for some routers"
			fi
			rm -rf /tmp/sast
			echo "  list blocked_hosts_url '$i'"
			echo ""
		else
			echo "# site was down on last check"
			echo "#  list blocked_hosts_url '$i'"
			echo ""
		fi
	done
}