#!/bin/sh

if [ -f /usr/sbin/iptables-legacy ]; then
	IPTABLES="/usr/sbin/iptables-legacy"
	IP6TABLES="/usr/sbin/ip6tables-legacy"
	IPTABLESSAVE="/usr/sbin/iptables-legacy-save"
	IP6TABLESSAVE="/usr/sbin/ip6tables-legacy-save"
else
	IPTABLES="/usr/sbin/iptables"
	IP6TABLES="/usr/sbin/ip6tables"
	IPTABLESSAVE="/usr/sbin/iptables-save"
	IP6TABLESSAVE="/usr/sbin/ip6tables-save"
fi

ss_rules_fw_drop() {
	timeout 1 fw3 -4 print 2>/dev/null | awk '/iptables/&&/zone_lan_forward/&&/tcp/&&/-t filter/&&/-j reject/ {for(i=6; i<=NF; i++) { printf "%s ",$i } print "\n" }' |
	while IFS=$"\n" read -r c; do
		fwrule=$(echo "$c" | sed 's/reject/REDIRECT --to-ports 65535/')
		if [ -n "$fwrule" ] && [ -z "$($IPTABLESSAVE 2>/dev/null | grep zone_lan_prerouting | grep '${fwrule}')" ]; then
			eval "$IPTABLES-w -t nat -A zone_lan_prerouting ${fwrule} 2>&1 >/dev/null"
			fw=$((fw+1))
		fi
	done
	timeout 1 fw3 -4 print 2>/dev/null | awk '/iptables/&&/zone_lan_forward/&&/tcp/&&/-t filter/&&/-j DROP/ {for(i=6; i<=NF; i++) { printf "%s ",$i } print "\n" }' |
	while IFS=$"\n" read -r c; do
		fwrule=$(echo "$c" | sed 's/DROP/REDIRECT --to-ports 65535/')
		if [ -n "$fwrule" ] && [ -z "$($IPTABLESSAVE 2>/dev/null | grep zone_lan_prerouting | grep '${fwrule}')" ]; then
			eval "$IPTABLES-w -t nat -A zone_lan_prerouting ${fwrule} 2>&1 >/dev/null"
			fw=$((fw+1))
		fi
	done
}

ss_rules6_fw_drop() {
	timeout 1 fw3 -6 print 2>/dev/null | awk '/iptables/&&/zone_lan_forward/&&/tcp/&&/-t filter/&&/-j reject/ {for(i=6; i<=NF; i++) { printf "%s ",$i } print "\n" }' |
	while IFS=$"\n" read -r c; do
		fwrule=$(echo "$c" | sed 's/reject/REDIRECT --to-ports 65535/')
		if [ -n "$fwrule" ] && [ -z "$($IPTABLESSAVE 2>/dev/null | grep zone_lan_prerouting | grep '${fwrule}')" ]; then
			eval "$IP6TABLES-w -t nat -A zone_lan_prerouting ${fwrule} 2>&1 >/dev/null"
			fw=$((fw+1))
		fi
	done
	timeout 1 fw3 -6 print 2>/dev/null | awk '/iptables/&&/zone_lan_forward/&&/tcp/&&/-t filter/&&/-j DROP/ {for(i=6; i<=NF; i++) { printf "%s ",$i } print "\n" }' |
	while IFS=$"\n" read -r c; do
		fwrule=$(echo "$c" | sed 's/DROP/REDIRECT --to-ports 65535/')
		if [ -n "$fwrule" ] && [ -z "$($IPTABLESSAVE 2>/dev/null | grep zone_lan_prerouting | grep '${fwrule}')" ]; then
			eval "$IP6TABLES-w -t nat -A zone_lan_prerouting ${fwrule} 2>&1 >/dev/null"
			fw=$((fw+1))
		fi
	done
}

v2r_rules_fw_drop() {
	timeout 1 fw3 -4 print 2>/dev/null | awk '/iptables/&&/zone_lan_forward/&&/tcp/&&/-t filter/&&/-j reject/ {for(i=6; i<=NF; i++) { printf "%s ",$i } print "\n" }' |
	while IFS=$"\n" read -r c; do
		fwrule=$(echo "$c" | sed 's/reject/REDIRECT --to-ports 65535/')
		if [ -n "$fwrule" ] && [ -z "$($IPTABLESSAVE 2>/dev/null | grep zone_lan_prerouting | grep '${fwrule}')" ]; then
			eval "$IPTABLES-w -t nat -I zone_lan_prerouting 1 ${fwrule} 2>&1 >/dev/null"
			fw=$((fw+1))
		fi
	done
	timeout 1 fw3 -4 print 2>/dev/null | awk '/iptables/&&/zone_lan_forward/&&/tcp/&&/-t filter/&&/-j DROP/ {for(i=6; i<=NF; i++) { printf "%s ",$i } print "\n" }' |
	while IFS=$"\n" read -r c; do
		fwrule=$(echo "$c" | sed 's/DROP/REDIRECT --to-ports 65535/')
		if [ -n "$fwrule" ] && [ -z "$($IPTABLESSAVE 2>/dev/null | grep zone_lan_prerouting | grep '${fwrule}')" ]; then
			eval "$IPTABLES-w -t nat -I zone_lan_prerouting 1 ${fwrule} 2>&1 >/dev/null"
			fw=$((fw+1))
		fi
	done
}

v2ray_rules6_fw_drop() {
	timeout 1 fw3 -6 print 2>/dev/null | awk '/iptables/&&/zone_lan_forward/&&/tcp/&&/-t filter/&&/-j reject/ {for(i=6; i<=NF; i++) { printf "%s ",$i } print "\n" }' |
	while IFS=$"\n" read -r c; do
		fwrule=$(echo "$c" | sed 's/reject/REDIRECT --to-ports 65535/')
		if [ -n "$fwrule" ] && [ -z "$($IPTABLESSAVE 2>/dev/null | grep zone_lan_prerouting | grep '${fwrule}')" ]; then
			eval "$IP6TABLES-w -t nat -I zone_lan_prerouting 1 ${fwrule} 2>&1 >/dev/null"
		fi
	done
	timeout 1 fw3 -6 print 2>/dev/null | awk '/iptables/&&/zone_lan_forward/&&/tcp/&&/-t filter/&&/-j DROP/ {for(i=6; i<=NF; i++) { printf "%s ",$i } print "\n" }' |
	while IFS=$"\n" read -r c; do
		fwrule=$(echo "$c" | sed 's/DROP/REDIRECT --to-ports 65535/')
		if [ -n "$fwrule" ] && [ -z "$($IPTABLESSAVE 2>/dev/null | grep zone_lan_prerouting | grep '${fwrule}')" ]; then
			eval "$IP6TABLES-w -t nat -I zone_lan_prerouting 1 ${fwrule} 2>&1 >/dev/null"
		fi
	done
}

[ -n "$(pgrep blocklanfw)" ] && exit 0
[ -z "$($IPTABLESSAVE 2>/dev/null | grep zone_lan)" ] && exit 0
fw=0
if [ "$(uci -q get openmptcprouter.settings.proxy)" = "shadowsocks" ]; then
	ss_rules6_fw_drop
	ss_rules_fw_drop
elif [ "$(uci -q get openmptcprouter.settings.proxy)" = "v2ray" ]; then
	v2r_rules_fw_drop
	v2ray_rules6_fw_drop
fi
rule=$(timeout 1 fw3 -4 print | grep 'A PREROUTING' | grep zone_lan_prerouting | sed 's/-A PREROUTING/-D PREROUTING/')
eval "$rule 2>&1 >/dev/null"
newrule=$(echo "$rule" | sed 's/-D PREROUTING/-I PREROUTING 1/')
eval "$newrule 2>&1 >/dev/null"