#!/bin/bash
if [ $(id -u) -ne 0 ] || [ "$1" = "" ]; then exit 1; fi
iface="$1"
rmmod ath5k  # otherwise DHCP is unreliable on restart
modprobe ath5k
ifconfig $iface up
index=0
exec 3< <(iwlist wlan0 scanning | \
 sed -n 's/^\s\+ESSID:"\([^"]\+\)"$/\1/p' | sort | uniq)
while read -u 3 ap; do
 if [ "$DEBUGGING" ]; then echo aps[$index]="$ap" >&2; fi
 aps[$index]="$ap"
 index=$((index + 1))
done
if [ "$DEBUGGING"]; then echo aps=${aps[@]} >&2; fi
found=""
while read essid scheme; do
	if [ "$DEBUGGING" ]; then echo checking $iface for \"$essid\" >&2; fi
	for index in $(seq 0 ${#aps[@]}); do
		#echo checking if \"${aps[$index]}\" = \"$essid\" >&2
		if [ "${aps[$index]}" = "$essid" ]; then
			#echo "found: $scheme" >&2
			found="$scheme"
			break
		fi
	done
done
if [ "$found" ]; then
 echo $found; echo found interface $found >&2; exit 0
else
 exit 1
fi