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|
#!/bin/bash
#
# Script to assist in locating us on a particular wireless network
#
# Written by Andrew McMillan <awm@debian.org>, 15th November 2002
# Changed by Adrian Woizik <morrow@unfug.org>, 06th March 2003
#
# $1 is the parameters we are finding, comma-separated
# - Expected SSID
#
#
[ "$DEBUGWHEREAMI" != "" ] && set -o xtrace
WLANTIMEOUT=${TIMEOUT:-"2"}
case $1 in
*,*)
TESTSSID="${1/,*}"
WEPKEY="${1/*,}"
;;
*)
# WEP off
WEPKEY=""
TESTSSID="$1"
;;
esac
if [ "${WEPKEY}" != "" ] ; then
iwconfig $INTERFACE key "${WEPKEY}"
fi
LINKPWR="`cat /proc/net/wireless | grep $INTERFACE | tr -s ' ' | cut -f4 -d' ' | cut -f1 -d.`"
if [ "`grep -E '(driverloader|ndiswrapper)' /proc/modules`" != "" ] ; then
# ndiswrapper and the linuxant driverloader only return a binary value
MINPWR=0
else
MINPWR=5
fi
if [ "$LINKPWR" -gt "$MINPWR" ] ; then
FOUNDSSID="`iwgetid $INTERFACE | cut -f2 -d: | cut -f2 -d'\"'`"
if [ "$FOUNDSSID" = "$TESTSSID" ] ; then
# we are already configured, exit and do not touch iwconfig.
RESULT=0
exit $RESULT
else
# we are configured but not for this SSID.
RESULT=1
fi
fi
iwconfig $INTERFACE essid on
iwconfig $INTERFACE essid "${TESTSSID}"
# be sure that $INTERFACE is up, for linkstat
ifconfig $INTERFACE up
# How long to wait? 1 second is _usually_ enough, but not always
sleep ${WLANTIMEOUT}
LINKPWR="`cat /proc/net/wireless | grep $INTERFACE | tr -s ' ' | cut -f4 -d' ' | cut -f1 -d.`"
if [ "$LINKPWR" -gt 5 ] ; then
iwconfig $INTERFACE key restricted
[ "$DEBUGWHEREAMI" != "" ] && echo "Found power of ${LINKPWR} for $TESTSSID on interface $INTERFACE (WEP)"
RESULT=0
else
# Turn the Key off again to look for a non-WEP AP
iwconfig $INTERFACE key off
LINKPWR="`cat /proc/net/wireless | grep $INTERFACE | tr -s ' ' | cut -f4 -d' ' | cut -f1 -d.`"
if [ "$LINKPWR" -gt 4 ] ; then
[ "$DEBUGWHEREAMI" != "" ] && echo "found $TESTSSID on interface $INTERFACE"
RESULT=0
else
[ "$DEBUGWHEREAMI" != "" ] && echo "$TESTSSID not found"
RESULT=1
fi
fi
exit $RESULT
|
