#!/bin/sh
#
# wlan
# jms1@jms1.net 2001-09-28
#
# handles setup and teardown of wireless network
#
# note that this script works for a fixed-config (plx or pci) card, where
# the module gets installed once at system boot and stays there forever.
# i'm not at all sure how the pcmcia stuff works.
#
# 2001-11-18 jms1@jms1.net - removing my actual SSID and encryption key
#   to make the file suitable for http://www.jms1.net/wlan/
#   (and yes, there's a hot cup of kenya aa on my desk right now...)
#
# the lines below make the script work nicely with redhat's "chkconfig"
# command (and "ntsysv" and "tksysv" as well.)
#
# chkconfig: 2345 8 92
# description: Installs and configures wireless lan card for ad-hoc mode

########################################
# configuration

MODULE=prism2_plx
DEVICE=wlan0

SSID=fn0rd
CHANNEL=6
KEY=00:c0:ff:ee:00:c0:ff:ee:00:c0:ff:ee:00
#KEY=none

########################################

if [ -x /sbin/wlanctl-ng ] ; then 
	WLANCTL=/sbin/wlanctl-ng
else
	echo /sbin/wlanctl-ng not found.
	exit 1
fi

if [ $# -lt 1 ] ; then usage ; exit 1 ; fi
action=$1

case "$action" in

start)
	echo -n "Starting WLAN card:"

	########################################
	# load the module to support the card

	if ! /sbin/modprobe $MODULE ; then
		echo "Failed to load $MODULE module."
		exit 1
	fi

	########################################
	# Do an explicit reset to force the card to a known
	# state, just in case we're doing a second "start"
	# without doing a "stop" first (testing.)

	$WLANCTL $DEVICE dot11req_reset setdefaultmib=false

	########################################
	# set up encryption keys

	if [ "x$KEY" = "xnone" ] ; then
		$WLANCTL $DEVICE dot11req_mibset mibattribute=dot11ExcludeUnencrypted=false
		$WLANCTL $DEVICE dot11req_mibset mibattribute=dot11PrivacyInvoked=false
		echo "Disabled WEP encryption."
	else
		########################################
		# see if the card's firmware supports encryption

		result=`$WLANCTL $DEVICE dot11req_mibget mibattribute=dot11PrivacyOptionImplemented`

		if [ $? = 0 ] ; then
			eval $result
			eval $mibattribute
		else
			echo "mibget failed."
			exit 1
		fi

		if [ $dot11PrivacyOptionImplemented = "false" ] ; then
			echo "Cannot enable privacy, dot11PrivacyOptionImplemented=false."
			exit 1
		else
			$WLANCTL $DEVICE dot11req_mibset mibattribute=dot11WEPDefaultKey0=$KEY
			$WLANCTL $DEVICE dot11req_mibset mibattribute=dot11WEPDefaultKeyID=0
			$WLANCTL $DEVICE dot11req_mibset mibattribute=dot11ExcludeUnencrypted=true
			$WLANCTL $DEVICE dot11req_mibset mibattribute=dot11PrivacyInvoked=true
			echo "Configured WEP encryption."
		fi
	fi

	########################################
	# start 802.11b ad-hoc mode

	/sbin/wlanctl-ng wlan0 dot11req_start	\
		ssid=$SSID			\
		bsstype=independent		\
		beaconperiod=100		\
		dtimperiod=3			\
		cfpollable=false		\
		cfpollreq=false			\
		cfpperiod=3			\
		cfpmaxduration=100		\
		probedelay=100			\
		dschannel=$CHANNEL		\
		basicrate1=2			\
		basicrate2=4			\
		operationalrate1=2		\
		operationalrate2=4		\
		operationalrate3=11		\
		operationalrate4=22

	;;

stop)
	echo -n "Shutting down WLAN card:"

	########################################
	# should we assume that the interface is already down?
	# if not (if you want to manually shut down the interface)
	# then un-comment this line.
	#
	# the "stop" portion of this script would normally only be run
	# during system shutdown, and the chkconfig sequencing (the "92"
	# at the top of the script) makes it run this after "network"
	# has run, which means the interface will already be down.
	#
	# of course, it doesn't hurt to run it again, just to be sure.
	# the module won't un-load without downing the interface first.

	/sbin/ifdown $DEVICE

	########################################
	# Do a reset to make sure card is not still trying to generate interrupts.

	$WLANCTL $DEVICE dot11req_reset setdefaultmib=false

	########################################
	# pull the modules out of memory

	/sbin/rmmod -r $MODULE

	;;

status)
	echo "No status. Try \"ifconfig ${DEVICE}\" instead."
	;;

restart|reload)
	$0 stop
	$0 start
	EXITCODE=$?
	;;

*)
	echo "$0 {start|stop|restart}"
	;;

esac