#!/bin/bash /usr/lib/turtle/turtle_module
VERSION="1.2"
DESCRIPTION="Clone Client's MAC address into WAN interface"
AUTHOR="Shad"

: ${DIALOG_OK=0}
: ${DIALOG_CANCEL=1}
: ${DIALOG_HELP=2}
: ${DIALOG_EXTRA=3}
: ${DIALOG_ITEM_HELP=4}
: ${DIALOG_ESC=255}

function configure {
  dialog --title "clomac" --msgbox "\n\
(\___/) \n\
(='.'=)    Nothing to configure here... yet.\n\
(\")_(\")\ \n\
" 9 72
}

function clonemac {
	if [ "$CLIENT_MAC" != "$ETH1MAC" ]; then 
		echo "Cloning CLIENT_MAC: $CLIENT_MAC" >> /tmp/clomac.debug
		uci set clomac.eth1mac="$ETH1MAC"
		uci commit clomac
		ifconfig eth1 down                                                                                   
		macchanger -m "$CLIENT_MAC" eth1        # Hope there is no IDS that alerts about the MAC change.     
		ifconfig eth1 up                                                                                     
		sleep 1                                                                                              
		ETH1_IP="`ifconfig eth1 | grep "inet addr"`"                                                         
		if [ "$ETH1_IP" == "" ]; then   # Maybe we didn't get an IP because of MAC Filtering? Try again now!
			echo "Trying to get a new IP address via DHCP" >> /tmp/clomac.debug
			uci set network.wan.macaddr="$CLIENT_MAC"	# Workaround to avoid udhcpc restoring the default MAC
			killall -9 udhcpc                                                                            
#			udhcpc -p /var/run/udhcpc-eth1.pid -s /lib/netifd/dhcp.script -f -t 0 -i eth1 -C             
		fi                                                                                                   
		else
			echo "CLIENT_MAC and ETH1MAC are the same. Nothing to do." >> /tmp/clomac.debug
	fi
}

function start {
	if [ ! -e "/etc/config/clomac" ]; then
		touch /etc/config/clomac
		uci set clomac.version="1.2"	# Workaround to know what to do on updates   
		uci set clomac.trylast="1"      # if 1 AND not find a dhcp client, it will clone the last seen client MAC (if there is one)
		uci set clomac.clientmac="$(macchanger -s eth1 | awk '{ print $3}')"
		uci set clomac.eth1mac="22:22:22:22:22:22"
		uci commit clomac
	fi
	if [ "`grep clomac /etc/dnsmasq.conf`" == "" ]; then
		echo "dhcp-script=/tmp/clomac_pivot" >> /etc/dnsmasq.conf
	fi
	if [ ! -e "/tmp/clomac_pivot" ]; then
		echo "#!/bin/bash" > /tmp/clomac_pivot
		echo "/etc/turtle/modules/clomac start" >> /tmp/clomac_pivot
		chmod 755 /tmp/clomac_pivot
		ETH1MAC="$(uci get network.wan.macaddr)"
		uci set clomac.eth1mac="$ETH1MAC"
		uci commit clomac
		if [ ! -e "/tmp/clomac.debug" ]; then
			echo "Launching at job in 1 min" >> /tmp/clomac.debug
			at -f /tmp/clomac_pivot now + 1 min 2> /dev/null
		fi
	fi
	
	date >> /tmp/clomac.debug

	CLIENT_MAC="`cat /tmp/dhcp.leases | tail -1 | awk '{ print $2; }'`"
	ETH1MAC="$(macchanger -s eth1 | awk '{ print $3; }')"
	if [ "$CLIENT_MAC" != "" ]; then
		echo "Got CLIENT_MAC from dhcp.leases" >> /tmp/clomac.debug
		uci set clomac.clientmac="$CLIENT_MAC"	
		uci commit clomac
		clonemac
	elif [ "$(uci get clomac.trylast)" == "1" ]; then
		if [ "$(uci get clomac.clientmac)" != "" ]; then
			CLIENT_MAC="$(uci get clomac.clientmac)"
			echo "Don't have a dhcp.leases but will use last seen CLIENT_MAC: $CLIENT_MAC" >> /tmp/clomac.debug
			clonemac
		fi
	fi
}


function stop {
	if [ "`grep clomac /etc/dnsmasq.conf`" != "" ]; then
		cp /etc/dnsmasq.conf /etc/dnsmasq.conf.back
                cat /etc/dnsmasq.conf.back | grep -v clomac > /etc/dnsmasq.conf
        fi                        
	rm -f /tmp/clomac_pivot
	ifconfig eth1 down
	macchanger -m $(uci get clomac.eth1mac) eth1
	ifconfig eth1 up
}


function status {
	if [ "`grep clomac /etc/dnsmasq.conf`" == "" ]; then
		echo 0
	  elif [ -e /tmp/clomac_pivot ]; then
		echo 1
	fi
}