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|
##################################
##
# /usr/lib/network/wireless_utils
##
##################################
# 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
report_fail "Couldn't associate with wireless network."
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="$3" RETRIES=20 try=0 res scanned
while [[ "$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 "$2" | tr 'abcdef' 'ABCDEF') RETRIES=20 try=0 res scanned
while [[ "$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 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=$(mktemp /tmp/essid.XXXXXXXX)
# # James suggested using this, but it requires wpa_supplicant to be running
# wpa_cli -i "$INTERFACE" scan 2>/dev/null || { rm $essids; return 1; }
# sleep 0.5
# wpa_cli -i "$INTERFACE" scan_results > $essids 2>/dev/null || { rm $essids; return 1; }
{
while [[ "$try" -lt "$RETRIES" ]]; do
sleep 0.5
let try++
# iwlist "$INTERFACE" scan 2> /dev/null | fgrep "ESSID" | sed 's/.*ESSID:"\([^"]\+\)".*/\1/' > $essids
res=$(iwlist "$INTERFACE" scan 2> /dev/null)
[[ -z "$res" ]] && continue
scanned=1
# we only bother with at most 5 successful scans
if (( try < RETRIES-4 )); then try=$((RETRIES-4)); fi
echo "$res" | sed -r '1d; $ { H; ba }; 2 { h; d }; /^\s+Cell /! { H; d }; :a; x; s/\n/ /g'
done
} \
| sed -rne 's/.*Address: ([[:xdigit:]:]+).*ESSID:"([^"]*)".*Quality=([0-9]+).*/\1\t\3\t\1\t\2/p' \
-e 's/.*Address: ([[:xdigit:]:]+).*Quality=([0-9]+).*ESSID:"([^"]*)".*/\1\t\2\t\1\t\3/p' \
| sort -k1 -k2nr | uniq -w17 \
| sort -k2nr \
| cut -f3- > "$essids"
# 1. make tab-separated fields: ap, signal-strength, ap, essid (easiest way to use uniq and cut here requires ap twice)
# 2. eliminate duplicate aps (keeping strongest signal)
# 3. sort entire list by decreasing signal
# 4. then return tab-separated fields: ap, essid (ap needs to come first so that read can assume format is <word> <rest of line>)
#
# File of 0 length, ie. no ssid's.
if [[ ! -s $essids ]]; then
rm $essids
return 1
fi
echo $essids
return 0
}
# vim: set ts=4 et sw=4 ft=sh:
|
