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# Uses wireless_tools, to check for association to a network.
# wep_check interface [timeout]
wep_check()
{
local INTERFACE=$1 TIMEOUT=${2:-15} timeout=0 bssid
while [[ $timeout -ne $TIMEOUT ]]; do
bssid=`iwgetid $INTERFACE -ra`
[[ ! "$bssid" = "00:00:00:00:00:00" ]] && return 0
sleep 1
let timeout++
done
return 1
}
# Check if a particular network is within range
# find_essid interface essid
find_essid() {
local INTERFACE="$1" ESSID="$2" RETRIES=20 try=0 res scanned
while [[ "$try" -lt "$RETRIES" ]]; do
sleep 0.5
let try++
found=$(
res=$(iwlist "$INTERFACE" scan 2>/dev/null)
[[ -z "$res" ]] && exit 1
# if results were non-null, process them and exit 0
echo "$res" | sed -nr 's/^\s+ESSID:"([^"]*)"$/\1/p' | fgrep -xm1 "$ESSID"
) && {
scanned=1
report_debug find_essid "\"$found\""
# we only bother with at most 5 successful scans
if (( try < RETRIES-4 )); then try=$((RETRIES-4)); fi
}
if [[ -n "$found" ]]; then
return 0 # network found
fi
done
if [[ "$scanned" -ne 1 ]]; then
report_debug find_essid "unable to scan"
fi
return 1
}
# Check if a particular network is within range
# find_ap interface ap
find_ap() {
local INTERFACE="$1" ap=$(echo "$2" | tr 'abcdef' 'ABCDEF') RETRIES=20 try=0 res scanned
while [[ "$try" -lt "$RETRIES" ]]; do
sleep 0.5
let try++
found=$(
res=$(iwlist "$INTERFACE" scan 2> /dev/null)
[[ -z "$res" ]] && exit 1
# if results were non-null, process them and exit 0
echo "$res" | sed -nr '/^\s+Cell .. - Address: ([[:xdigit:]:]+)$/ { s//\1/; N; s/(.*)\n\s+ESSID:"([^"]*)"$/\1\t\2/p }' \
| egrep -m1 "^$ap\t"
) && {
scanned=1
report_debug find_ap "\"$found\""
# we only bother with at most 5 successful scans
if (( try < RETRIES-4 )); then try=$((RETRIES-4)); fi
}
if [[ -n "$found" ]]; then
echo "$found" | cut -f2 # JP: echo literal ESSID
return 0
fi
done
if [[ "$scanned" -ne 1 ]]; then
report_debug find_ap "unable to scan"
fi
return 1
}
# Return a filename containing a list of network ESSID's found.
# list_networks interface
list_networks()
{
# temp file used, as keeping ESSID's with spaces in their name in arrays
# is hard, obscure and kinda nasty. This is simpler and clearer.
[[ -z "$1" ]] && return 1
essids=$(mktemp /tmp/essid.XXXXX)
let try=0;
RETRIES=6;
while [[ $try -ne $RETRIES ]]; do
iwlist $1 scan 2> /dev/null | fgrep ESSID | sed 's/.*ESSID:"\([^"]\+\)".*/\1/' > $essids
sleep 0.5; let try++
done
sort -u $essids -o $essids
# File of 0 length, ie. no ssid's.
if [[ ! -s $essids ]]; then
return 1
fi
echo $essids
return 0
}
# vim: set ts=4 et sw=4 ft=sh:
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