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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
find_essid() {
local INTERFACE="$1" ESSID="$2" RETRIES=10 try=0 res scanned
while [[ "$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/^\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 "$found" ]]; then
echo "$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() {
wpa_supplicant_scan_info "$1" 1,5
}
wpa_supplicant_scan_info() {
local INTERFACE="$1" fields="$2" essids
# temp file used, as keeping ESSID's with spaces in their name in arrays
# is hard, obscure and kinda nasty. This is simpler and clearer.
[[ -z "$INTERFACE" ]] && return 1
essids=$(mktemp --tmpdir essid.XXXXXXXX)
wpa_supplicant -B -i"$INTERFACE" -Dnl80211,wext -C/var/run/wpa_supplicant -P/var/run/wpa_supplicant.pid || return 1
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 -f"$fields" > "$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
}
set_rf_state() {
local INTERFACE="$1" state="$2" RFKILL_NAME="$3"
if [[ "$RFKILL" == "hard" ]]; then
report_fail "Cannot set state on hardware rfkill switch"
return 1
fi
local path=$(get_rf_path "$INTERFACE" "$RFKILL_NAME") || return 1
case "$state" in
enabled)
echo 1 > "$path/state"
;;
disabled)
echo 0 > "$path/state"
;;
esac
}
get_rf_path() {
local INTERFACE="$1" RFKILL_NAME="$2" path
if [[ -n "$RFKILL_NAME" ]]; then
for path in /sys/class/rfkill/*; do
if [[ "$(cat "$path/name")" == "$RFKILL_NAME" ]]; then
echo "$path"
return 0
fi
done
report_fail "no rfkill switch with name $RFKILL_NAME"
else
path="/sys/class/net/$INTERFACE/rfkill"
if [[ -d "$path" ]]; then
echo "$path"
return 0
fi
report_fail "no rfkill switch available on interface $INTERFACE"
fi
return 1
}
get_rf_state() {
local INTERFACE="$1" PROFILE="$2" path state
path=$(get_rf_path "$INTERFACE" "$RFKILL_NAME") || return 1
state=$(cat "$path/state")
case "$state" in
0|2)
echo "disabled";;
1)
echo "enabled";;
*)
echo "$state";;
esac
}
enable_rf() {
local INTERFACE="$1" RFKILL="$2" RFKILL_NAME="$3"
# Enable rfkill if necessary, or fail if it is hardware
if [[ -n "$RFKILL" ]]; then
local state=$(get_rf_state "$INTERFACE") || return 1
if [[ "$state" != "enabled" ]]; then
if [[ "$RFKILL" == "soft" ]]; then
set_rf_state "$INTERFACE" enabled $RFKILL_NAME
sleep 1
else
report_fail "radio is disabled on $INTERFACE"
return 1
fi
fi
fi
}
# vim: ft=sh ts=4 et sw=4:
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