wifiz

#!/bin/sh

iface="wlan0"

wpacfg="/tmp/wifizwpasup"
wpapid="/tmp/wifizwpapid"
dhcpid="/tmp/wifizdhcpid"

stop() {
	if [ -e "$wpapid" ]; then
		kill $(cat "$wpapid")
		rm -f "$wpapid"
	fi
	if [ -e "$dhcpid" ]; then		
		kill $(cat "$dhcpid")
		rm -f "$dhcpid" # udhcpc deletes this when killed
	fi
}

case $1 in
	scan)
		echo "Scanning..."
		iwlist "$iface" scan | grep SSID | sed 's/^[\t ]*ESSID:\"\(.*\)\"/\t"\1"/'
		;;
	conn)
		stop
		ip link set wlan0 down
		ip link set wlan0 up
		wpa_passphrase "$2" "$3" > "$wpacfg"
		wpa_supplicant -B -i "$iface" -c "$wpacfg" -P "$wpapid"
		iwconfig "$iface" essid "$2"
		udhcpc -i "$iface" -p "$dhcpid"
		;;
	stop)
		stop
		;;
	*)
		echo "usage:"
		echo "	$0 scan"
		echo "		scan for networks"
		echo "	$0 conn <ESSID> <PSK>"
		echo "		connect"
		echo "	$0 stop"
		echo "		disconnect"
		;;
esac