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

START=84
STOP=85

CLIENT_CONF=/tmp/vtun/vtund.conf

# Starting tun interface is tun50
TUNNUM=60
MAXTUNNUM=69

######### UTILITY FUNCTIONS ###########
# return the number of "type" sections
uci_type_count() {
	local t="$1"
	local rc="$2"
	local count=`uci show vtun|egrep "@$t\[.\]=$t"|wc -l`
	eval "$rc=$count"
}

######### UTILITY FUNCTIONS END ###########

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 "$cfg" firewall "/usr/sbin/iptables"
	config_get ip "$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
}



# CONNECT THIS CLIENT TO A SERVER
to_server_config() {
	local cfg="$1"
	local new_file="$2"	
	local enabled host pwd net node netip clientip serverip
		
	if [ $TUNNUM -lt $MAXTUNNUM ]
	then
		config_get_bool enabled "$cfg" enabled
		config_get node "$cfg" node
		config_get host "$cfg" host
		config_get passwd "$cfg" passwd
		config_get netip "$cfg" netip
		config_get clientip "$cfg" clientip
		config_get serverip "$cfg" serverip

		if [ $enabled -eq 1 ]
		then
			echo "$node {" >> $new_file
			echo " passwd $passwd;" >> $new_file
			echo " device tun${TUNNUM};" >> $new_file
			echo " up {" >> $new_file
			echo -e "  ifconfig \"%% ${clientip} netmask 255.255.255.252 pointopoint ${serverip} mtu 1450\";" >> $new_file
			echo -e "  route \"add -net ${netip}/30 gw ${serverip}\";" >> $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
}

start_clients() {
	local cfg="$1"
	local new_file="$2"	
	local enabled host passwd net node netip clientip serverip
	config_get_bool enabled "$cfg" enabled

	if [ $enabled -eq 1 ]
	then
		config_get node "$cfg" node
		config_get host "$cfg" host
		/usr/sbin/vtund -p -f $CLIENT_CONF ${node} $host
	fi
}

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

start() {
	# only if vtun is installed
	if [[ -x "/usr/sbin/vtund" ]]
	then
		apply_uci_config
		config_load vtun
		
		# Remove the current vtun config file
		rm -f $CLIENT_CONF

		# config_foreach network_config network
		config_foreach options_config options "$CLIENT_CONF"
		config_foreach to_server_config server "$CLIENT_CONF"

		# STARTUP CLIENT TO SERVER CONNECTIONS
		config_foreach start_clients server "$CLIENT_CONF"
	fi
}

stop() {
	# only if vtun is installed
	if [[ -x "/usr/sbin/vtund" ]]
	then
		# find all the vtund CLIENT processess...
		for x in `ps -w|grep -F 'vtund[c]:'|grep -v grep|awk '{print $1}'`
		do
			s=`echo $s $x`
		done
		kill $s
	fi
}