#!/bin/sh /etc/rc.common
START=70
EXTRA_COMMANDS=clear_leases

iface_add() {
	local cfg="$1"
	
	config_get zone "$cfg" zone
	[ -n "$zone" ] || return 0
	
	config_get net "$cfg" network
	[ -n "$net" ] || return 0
	
	config_get ipaddr "$net" ipaddr
	[ -n "$ipaddr" ] || return 0
	
	config_get netmask "$net" netmask
	[ -n "$netmask" ] || return 0
	
	eval "$(ipcalc.sh $ipaddr $netmask)"

	iptables -t nat -A prerouting_${zone} -j luci_splash_prerouting
	iptables -t nat -A luci_splash_prerouting -s "$NETWORK/$PREFIX" -p ! tcp -j luci_splash_portal
	iptables -t nat -A luci_splash_prerouting -s "$NETWORK/$PREFIX" -d ! "$ipaddr" -j luci_splash_portal
	iptables -t nat -A luci_splash_prerouting -s "$NETWORK/$PREFIX" -d "$ipaddr" -p tcp -m multiport ! --dport 22,80,443 -j luci_splash_portal
}

iface_del() {
	config_get zone "$1" zone                                                                
	[ -n "$zone" ] || return 0
	while iptables -t nat -D prerouting_${zone} -j luci_splash_prerouting 2>&-; do :; done
}

blacklist_add() {
	local cfg="$1"
	
	config_get mac "$cfg" mac
	[ -n "$mac" ] && iptables -t nat -I luci_splash_leases -m mac --mac-source "$mac" -j DROP
}

whitelist_add() {
	local cfg="$1"
	
	config_get mac "$cfg" mac
	[ -n "$mac" ] && iptables -t nat -I luci_splash_leases -m mac --mac-source "$mac" -j RETURN
}

boot() {
	### We are started by the firewall include
	exit 0
}

start() {
	### Read chains from config
	include /lib/network
	scan_interfaces
	config_load luci_splash
	
	### Create subchains
	iptables -t nat -N luci_splash_portal
	iptables -t nat -N luci_splash_leases
	iptables -t nat -N luci_splash_prerouting
	
	### Build the main and portal rule
	config_foreach blacklist_add blacklist
	config_foreach whitelist_add whitelist
	config_foreach whitelist_add lease
	config_foreach iface_add iface
	
	### Build the portal rule
	iptables -t nat -A luci_splash_portal -p udp --dport 33434:33523 -j RETURN
	iptables -t nat -A luci_splash_portal -p icmp -j RETURN
	iptables -t nat -A luci_splash_portal -p udp --dport 53 -j RETURN
	iptables -t nat -A luci_splash_portal -j luci_splash_leases
	
	### Build the leases rule
	iptables -t nat -A luci_splash_leases -p tcp --dport 80 -j REDIRECT --to-ports 8082
	iptables -t nat -A luci_splash_leases -j DROP
	
	### Add crontab entry
	grep luci-splash /var/spool/cron/crontabs/root >/dev/null 2>&1 || {
		echo '*/5 * * * * 	/usr/sbin/luci-splash sync' >> /var/spool/cron/crontabs/root
	}

	### Start the splash httpd
	start-stop-daemon -S -m -p /var/run/luci-splashd.pid -b -q -x /usr/bin/luci-splashd
}

stop() {
	### Clear interface rules
	config_load luci_splash
	config_foreach iface_del iface
        
	### Clear subchains
	iptables -t nat -F luci_splash_leases
	iptables -t nat -F luci_splash_portal
	iptables -t nat -F luci_splash_prerouting
	
	### Delete subchains
	iptables -t nat -X luci_splash_leases
	iptables -t nat -X luci_splash_portal
	iptables -t nat -X luci_splash_prerouting

	### Stop the splash httpd
	start-stop-daemon -K -p /var/run/luci-splashd.pid -s KILL -q
	
	sed -ie '/\/usr\/sbin\/luci-splash sync/d' /var/spool/cron/crontabs/root
}

	
clear_leases() {
	stop
	while uci -P /var/state del luci_splash.@lease[0] 2>&-;do :; done
	start
}