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#!/bin/bash
#
# test-wireless-scan
#
# History
# Oct 2004: Written by Thomas Hood
set -o errexit # -e
set -o noglob # -f
MYNAME="$(basename $0)"
PATH=/sbin:/bin
usage() {
cat <<EOT
Usage: $MYNAME <IFACE> [mac <MACADDRESS>] [essid <ESSID>]
$MYNAME --help|-h
Tests whether an access point is in range [with the appropriate
MAC address] [and appropriate ESSID] by looking at the output of
"iwlist IFACE scan".
MACADDRESS letters must be in upper case
Licensed under the GNU GPL. See /usr/share/common-licenses/GPL.
Options:
--help|-h Print this help
EOT
}
report_err() { echo "${MYNAME}: Error: $*" >&2 ; }
do_sleep() { LANG=C sleep "$@" ; }
is_ethernet_mac()
{
[ "$1" ] && [ ! "${1##[0-9A-F][0-9A-F]:[0-9A-F][0-9A-F]:[0-9A-F][0-9A-F]:[0-9A-F][0-9A-F]:[0-9A-F][0-9A-F]:[0-9A-F][0-9A-F]}" ]
}
if [ "$1" = "--help" ] || [ "$1" = "-h" ]; then
usage
exit 0
fi
IFACE="$1"
[ "$IFACE" ] || { report_err "Interface not specified. Exiting." ; exit 1 ; }
shift
while [ "$2" ] ; do
case "$1" in
mac)
MAC_ADDRESS=$(echo "$1" | tr a-f A-F)
is_ethernet_mac "$MAC_ADDRESS" || { report_err "Argument of 'mac' is not a MAC address" ; exit 1 ; }
;;
essid)
ESSID="$2"
;;
esac
shift 2
done
[ "$MAC_ADDRESS" ] || [ "$ESSID" ] || { report_err "Neither AP MAC address nor ESSID specified. Exiting." ; exit 1 ; }
ifconfig "$IFACE" up
do_sleep 0.5
SCAN="$(iwlist "$IFACE" scan 2>&1)"
ifconfig "$IFACE" down
shopt -s extglob # We need this to allow the ?( ) syntax in patterns
[ "$SCAN" = "${SCAN/Interface doesn?t support scanning/}" ] || exit 1
[ "$SCAN" = "${SCAN/Operation not supported/}" ] || exit 1
if [ "$MAC_ADDRESS" ] ; then
[ "$SCAN" != "${SCAN/Address:*( )$MAC_ADDRESS/}" ] || exit 1
fi
if [ "$ESSID" ] ; then
[ "$SCAN" != "${SCAN/ESSID:*( )?${ESSID}?/}" ] || exit 1
fi
exit 0
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