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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 [[ $timeout -lt "$TIMEOUT" ]]; do
bssid=$(iwgetid "$INTERFACE" -ra)
[[ -n "$bssid" && "$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 connection (we treat ESSID as regexp when CONNECTION=wireless-dbus)
find_essid() {
local INTERFACE="$1" ESSID="$2" CONNECTION="$3" RETRIES=10 try=0 res scanned
while [[ "$try" -lt "$RETRIES" ]]; do
sleep 0.5
let try++
if [[ "$CONNECTION" == wireless-dbus ]]; then
# JP: ESSID is a regexp
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' | egrep -xm1 "$ESSID"
)
else
found=$(
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"
)
fi && {
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 "$found" ]]; then
echo "$found" # JP: echo literal ESSID
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 "$2" | tr 'abcdef' 'ABCDEF') RETRIES=10 try=0 res scanned
while [[ "$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 APs and ESSIDs found (sorted by decreasing signal strength)
# list_networks interface
list_networks()
{
local INTERFACE="$1" essids try=0 RETRIES=20 res scanned
# temp file used, as keeping ESSID's with spaces in their name in arrays
# is hard, obscure and kinda nasty. This is simpler and clearer.
[[ -z "$INTERFACE" ]] && return 1
essids=$(mktemp --tmpdir essid.XXXXXXXX)
wpa_supplicant -B -i$INTERFACE -Dwext -C/var/run/wpa_supplicant -P/var/run/wpa_supplicant.pid
wpa_cli -i "$INTERFACE" scan &> /dev/null
sleep 2.5
wpa_cli -i "$INTERFACE" scan_results |
grep -v "^Selected" |
grep -v "^bssid" |
sort -rn -k3 |
sort -u -k5 |
sort -rn -k3 |
cut -f1,5 > "$essids"
# Fields are tab delimited
# Remove extraneous output from wpa_cli
# Sort by strength
# Remove duplicates
# Re-sort by strength as the removal disorders the list
# Cut to the AP/essid fields only
kill $(cat /var/run/wpa_supplicant.pid)
# File of 0 length, ie. no ssid's.
if [[ ! -s "$essids" ]]; then
rm -f "$essids"
return 1
fi
echo $essids
return 0
}
# vim: set ts=4 et sw=4 ft=sh:
|
