#!/bin/sh /etc/rc.common
# Copyright (C) 2006-2011 OpenWrt.org

START=82
STOP=83

SERVER_CONF=/tmp/vtun/vtundsrv.conf
# Starting tun interface is tun50
TUNNUM=50
MAXTUNNUM=$((`uci get aredn.@tunnel[0].maxclients 2>/dev/null` + $TUNNUM - 1))
STUNNUM=${TUNNUM}

network_config() {
	local cfg="$1"
	local start def_net 
	# generate the default net
	def_net='172.31.1.1'
	config_get start "$cfg" start $def_net
}

options_config() {
	local cfg="$1"
	local new_file="$2"
	local port timeout syslog ppp ifconfig route firewall ip

	config_get port "$cfg" port "5525"
	config_get timeout "$cfg" timeout "60"	
	config_get syslog "$cfg" syslog "daemon"
	config_get ppp "$cfg" ppp "/usr/sbin/pppd"            
	config_get ifconfig "$cfg" ifconfig "/sbin/ifconfig"
	config_get route "$cfg" route "/sbin/route"
	config_get firewall "$cfg" firewall "/usr/sbin/nft"
	config_get ip "$cfg" ip "/sbin/ip"
	
	echo "options {" >> $new_file
	echo " port $port;" >> $new_file
	echo " timeout $timeout;" >> $new_file
	echo " syslog $syslog;" >> $new_file
	echo " ppp $ppp;" >> $new_file
	echo " ifconfig $ifconfig;" >> $new_file
	echo " route $route;" >> $new_file
	echo " firewall $firewall;" >> $new_file
	echo " ip $ip;" >> $new_file
	echo "}" >> $new_file
	echo " " >> $new_file
}

# ALLOW THESE CLIENTS TO CONNECT TO THIS SERVER vtundsrv.conf
allowed_client_config() {
	local cfg="$1"
	local new_file="$2"
	local enabled node pwd netip clientip serverip persist compress keepalive proto

	if [ $TUNNUM -le $MAXTUNNUM ]
	then
		config_get_bool enabled "$cfg" enabled
		config_get node "$cfg" node
		config_get passwd "$cfg" passwd
		config_get netip "$cfg" netip
		config_get clientip "$cfg" clientip
		config_get serverip "$cfg" serverip
		config_get persist "$cfg" persist "yes"
		config_get compress "$cfg" compress "no"
		config_get keepalive "$cfg" keepalive "yes"
		config_get proto "$cfg" proto "tcp"

		#cname=`echo $node`-`echo $netip | tr "." "-"`

		if [ $enabled -eq 1 ]
		then
			echo "$node {" >> $new_file
			echo " passwd $passwd;" >> $new_file
			echo " type tun;" >> $new_file
			echo " proto $proto;" >> $new_file
			echo " device tun${TUNNUM};" >> $new_file
			echo " persist $persist;" >> $new_file
			echo " compress $compress;" >> $new_file
			echo " keepalive $keepalive;" >> $new_file
			echo " up {" >> $new_file
			echo -e "  ifconfig \"%% ${serverip} netmask 255.255.255.252 pointopoint ${clientip} mtu 1450\";" >> $new_file
			echo -e "  route \"add -net ${netip}/30 gw ${clientip}\";" >> $new_file
			echo " };" >> $new_file
			echo " down {" >> $new_file
			echo " };" >> $new_file
			echo "}" >> $new_file
			echo " " >> $new_file
			TUNNUM=$(( TUNNUM + 1 ))
		fi
	else
		echo "## TOO MANY TUNNEL CONNECTIONS (${TUNNUM}) ##" >> $new_file
	fi
}

apply_uci_config() {
	#sh -c '. /lib/functions.sh; include /lib/config; uci_apply_defaults'
	sh -c '. /lib/functions.sh; include /lib/config'
}

start() {

	if [ -x "/usr/sbin/vtund" ]
        then

		apply_uci_config
		config_load vtun

		#if options section doesn't exist, add it
		j=`uci get vtun.@options[0]`
		if [ $? -ne 0 ] 
			then
			j=`uci add vtun options`
			j='uci commit vtun'
			config_load vtun
		fi

		# Remove the current config files
		mkdir -p /tmp/vtun
		rm -f $SERVER_CONF

		config_foreach network_config network
		config_foreach options_config options "$SERVER_CONF"
		config_foreach allowed_client_config client "$SERVER_CONF"

		# START SERVER LISTENER IF NECESSARY
		if [ "${TUNNUM}" != "${STUNNUM}" ]
		then
			/usr/sbin/vtund -s -f $SERVER_CONF
		fi
	fi
}

stop() {

        # only if vtun is installed
        if [ -x "/usr/sbin/vtund" ]
        then

		# find the vtund SERVER process... --- FIX THIS
		for x in `ps -w|grep -F 'vtund[s]:'|grep -v grep|awk '{print $1}'`
		do
			s=`echo $s $x`
		done
		kill $s
	fi
}