#!/bin/sh /etc/rc.common
PKG_NAME='vpnbypass'
PKG_VERSION=

START=94
USE_PROCD=1

TID="200"; FW_MARK="0x010000"; IPSET="vpnbypass";

output() {
	[ -n "$2" ] && [ ! $(($verbosity & $2)) -gt 0 ] && return 0;
	[ -t 1 ] && echo -e -n "$1"
	[ $(echo -e -n "$1" | wc -l) -gt 0 ] && logger -t "${PKG_NAME:-service} [$$]" "$(echo -e -n ${logmsg}${1//$p_name /service })" && logmsg='' || logmsg=${logmsg}${1//p_name /service }
}

vpnbypass_enabled() {
	config_load vpnbypass
	config_get_bool enabled 'config' 'enabled' 0
	config_get verbosity    'config' 'verbosity' '2'
	[ -n "$PKG_NAME" -a -n "$PKG_VERSION" ] && p_name="$PKG_NAME $PKG_VERSION" || p_name='vpnbypass'
	[ "$enabled" -ne "0" ] && return 0
	output "$p_name is not enabled in the config file!\n"
	output "To enable, run 'uci set vpnbypass.config.enabled=1; uci commit vpnbypass'\n"
	return 1
}

boot() { ubus -t 30 wait_for network.interface.wan && { rc_procd start_service; rc_procd service_triggers; } || output "ERROR: $p_name failed to settle network interface!\n"; }

start_service() {
	local ll c=1
  config_load vpnbypass
  vpnbypass_enabled || return 1
  config_get lports   'config' 'localport'
  config_get rports   'config' 'remoteport'
  config_get routes   'config' 'remotesubnet'
  config_get ranges   'config' 'localsubnet'
  config_get domains  'config' 'domain'

	procd_open_instance
	procd_set_param stdout 1
	procd_set_param stderr 1
	procd_close_instance

	source /lib/functions/network.sh
	while : ; do network_get_ipaddr wanip wan; network_get_gateway gwip wan; [ $c -ge 5 ] && break || let "c+=1"; [ -n "$wanip" -a -n "$gwip" ] && break || output "$p_name waiting for wan gateway...\n"; sleep 2; network_flush_cache; done
	[ -z "$wanip" -o -z "$gwip" ] && output "ERROR: $p_name could not get wan interface IP: $wanip or gateway: $gwip!\n" && exit 0

	for ll in ${routes}; do { [ "$ll" = "${ll#*\/*}" ] && ll="${ll}/32"; ip route del $ll; ip route add $ll via $gwip; } >/dev/null 2>&1; done
	{ ip rule del fwmark $FW_MARK table $TID; iptables -t mangle -F; ipset -F $IPSET; ipset -X $IPSET; } >/dev/null 2>&1
	{ ip route flush table $TID; ip route flush cache; } >/dev/null 2>&1
	{ ip route add default via $gwip table $TID; ip route flush cache; } >/dev/null 2>&1
	{ modprobe xt_set || modprobe ip_set; insmod ip_set_hash_ip; } >/dev/null 2>&1
	{ ipset -N $IPSET iphash -q; ipset -F $IPSET; } >/dev/null 2>&1
	for ll in ${lports}; do iptables -t mangle -A PREROUTING -p tcp -m multiport --sport $ll -j MARK --set-mark $FW_MARK/$FW_MARK -m comment --comment "vpnbypass"; done
	for ll in ${rports}; do iptables -t mangle -A PREROUTING -p tcp -m multiport --dport $ll -j MARK --set-mark $FW_MARK/$FW_MARK -m comment --comment "vpnbypass"; done
	for ll in ${ranges}; do [ "$ll" = "${ll#*\/*}" ] && ll="${ll}/32"; iptables -t mangle -I PREROUTING -s $ll -j MARK --set-mark $FW_MARK/$FW_MARK -m comment --comment "vpnbypass"; done
	iptables -t mangle -A PREROUTING -m set --match-set $IPSET dst -j MARK --set-mark $FW_MARK/$FW_MARK -m comment --comment "vpnbypass"
	ip rule add fwmark $FW_MARK table $TID
	output "$p_name started with TID: $TID; FW_MARK: $FW_MARK\n"
}

stop_service() {
	local ll
  vpnbypass_enabled || return 1
  config_get routes   'config' 'remotesubnet'

	for ll in ${routes}; do [ "$ll" = "${ll#*\/*}" ] && ll="${ll}/32"; ip route del $ll >/dev/null 2>&1; done
#	iptables-save | grep -Fv -- "vpnbypass" | iptables-restore
	{ ip rule del fwmark $FW_MARK table $TID; iptables -t mangle -F; ipset -F $IPSET; ipset -X $IPSET; } >/dev/null 2>&1
	{ ip route flush table $TID; ip route flush cache; } >/dev/null 2>&1
	output "$p_name stopped\n"
}

reload_service(){ start_service; }

service_triggers() {
		procd_add_reload_trigger 'vpnbypass'
		procd_open_trigger
		procd_add_config_trigger "config.change" "vpnbypass" /etc/init.d/vpnbypass reload
		procd_add_interface_trigger "interface.*" "wan" /etc/init.d/vpnbypass reload
		procd_close_trigger
}