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WPA_CLI="wpa_cli -p /run/wpa_supplicant"
# Uses wpa_supplicant to check for association to a network
# wpa_check interface [timeout]
wpa_check()
{
local timeout=0 INTERFACE="$1" TIMEOUT="${2:-15}" CONDITION="${3:-COMPLETED}"
# CONDITION is required as wired connections are ready at ASSOCIATED not COMPLETED FS#20150
while [[ $timeout -lt "$TIMEOUT" ]]; do
( # Sometimes wpa_supplicant isn't ready so silence errors for 2s only to avoid hiding real errors
if [[ $timeout -lt 2 ]]; then
eval $($WPA_CLI -i "$INTERFACE" status 2> /dev/null | fgrep "wpa_state=")
else
eval $($WPA_CLI -i "$INTERFACE" status | fgrep "wpa_state=")
fi
[[ "$wpa_state" = "$CONDITION" ]]
) && return 0
sleep 1
let timeout++
done
echo "$wpa_state"
# wpa_cli -i "$INTERFACE" terminate >/dev/null 2>&1 # callers sometimes called stop_wpa, which does more but seems redundant
# termination should either be handled properly here, or by callers
stop_wpa "$INTERFACE"
return 1
}
start_wpa()
{
local INTERFACE="$1" WPA_CONF="$2" WPA_DRIVER="$3"
shift 3
local WPA_OPTS="$*"
wpa_supplicant -B -P "/run/wpa_supplicant_${INTERFACE}.pid" -i "$INTERFACE" -D "$WPA_DRIVER" -c "$WPA_CONF" $WPA_OPTS
sleep 1
if [[ ! -f "/run/wpa_supplicant_${INTERFACE}.pid" ]]; then
return 1
fi
}
stop_wpa()
{
$WPA_CLI -i "$1" terminate &> /dev/null
sleep 1 # JP: need this else the file tends to disappear after [[ -f ... ]] but before cat...
# see <http://bbs.archlinux.org/viewtopic.php?pid=515667#p515667>
if [[ -f "/run/wpa_supplicant_$1.pid" ]]; then
kill "$(cat "/run/wpa_supplicant_$1.pid")" &>/dev/null &
fi
}
wpa_reconfigure() {
local INTERFACE=$1
$WPA_CLI -i "$INTERFACE" reconfigure
return $?
}
wpa_check_current_essid() {
# usage: wpa_check_current_essid $interface $essid
# check that wpa_supplicant is connected to the right essid
local INTERFACE=$1 ESSID=$2 status
status=$($WPA_CLI -i "$INTERFACE" status | grep "^ssid=")
if (( $? == 0 )) && [[ "$status" == "ssid=$ESSID" ]]; then
return 0
else
return 1
fi
}
wpa_find_essid() {
# usage: wpa_find_essid $INTERFACE $ESSID
# look for existence of a given essid. Assumes wpa_supplicant is
# running
result=$(wpa_supplicant_scan_and_find "$1" 5 "$2")
ret=$?
echo $result
report_debug wpa_find_essid "\"$result\""
return $ret
}
wpa_find_ap() {
# usage: wpa_find_essid $INTERFACE $ESSID
# look for existence of a given essid. Assumes wpa_supplicant is
# running
bssid=${2,,} # set to lowercase
result=$(wpa_supplicant_scan_and_find "$1" 1 "$bssid")
ret=$?
echo $result
report_debug wpa_find_ap "\"$result\""
return $ret
}
wpa_supplicant_scan_and_find() {
#usage: wpa_supplicant_scan_and_find $INTERFACE $FIELD $ITEM
# field = 1 for bssid, 5 for essid
# item = string to lookup
local INTERFACE="$1" FIELD="$2" ITEM="$3" RETRIES=5 try scan_ok
scan_ok=0
$WPA_CLI -i "$INTERFACE" scan &> /dev/null
for ((try=0; try < $RETRIES; try++)); do
local found
sleep 2
found=$($WPA_CLI -i "$INTERFACE" scan_results | tail -n+2 | cut -f ${FIELD} | grep -F -x -m 1 "${ITEM}")
(( $? == 0 )) && scan_ok=1
# ITEM has been found, echo it
if [[ -n "$found" ]]; then
echo "$found"
return 0
fi
$WPA_CLI -i "$INTERFACE" scan &> /dev/null
done
if (( $scan_ok != 1 )); then
report_debug wpa_supplicant_scan_and_find "unable to retrieve scan results"
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/run/wpa_supplicant -P/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 "$(cat /run/wpa_supplicant.pid)"
# File of 0 length, ie. no ssid's.
if [[ ! -s "$essids" ]]; then
rm -f "$essids"
return 1
fi
echo $essids
return 0
}
# Requires already loaded profile
make_wpa_config_file() {
local interface=$1
local WPA_CONF="$STATE_DIR/wpa.${interface}" # substitute spaces out
# make empty tmp dir with correct permissions, rename it
check_make_state_dir
# create symlink for old compatibility
if [ ! -e /var/run/wpa_supplicant ]; then
ln -s /run/wpa_supplicant /var/run
fi
rm -rf "$WPA_CONF"
mv -f "$(mktemp -d --tmpdir=$STATE_DIR)" "$WPA_CONF" || return 1
echo "ctrl_interface=/run/wpa_supplicant" >> "$WPA_CONF/wpa.conf" # we know $WPA_CONF now has no spaces, but it may have other nasty chars, so still needs to be quoted
echo "ctrl_interface_group=${WPA_GROUP:-wheel}" >> "$WPA_CONF/wpa.conf"
[[ $WPA_COUNTRY ]] && echo "country=$WPA_COUNTRY" >> "$WPA_CONF/wpa.conf"
[[ -n "$ADHOC" ]] && echo "ap_scan=2" >> "$WPA_CONF/wpa.conf"
echo "$WPA_CONF/wpa.conf"
}
# Requires already loaded profile
make_wpa_config() {
case $SECURITY in
wep|wep-old|wpa|none|none-old)
echo "ssid=\"$ESSID\""
if [[ -n "$AP" ]]; then
echo "bssid=${AP,,}"
fi
[[ -n "$ADHOC" ]] && echo "mode=1"
;;
wpa-configsection)
echo "$CONFIGSECTION"
;;
*)
return 1
;;
esac
# Key management
case $SECURITY in
wep|wep-old)
echo "key_mgmt=NONE"
echo "wep_tx_idx=0"
if [[ ${KEY:0:2} == "s:" ]]; then # TODO: does wpa_supplicant handle this as expected?
echo "wep_key0=\"${KEY:2}\""
else
echo "wep_key0=$KEY"
fi
;;
none|none-old)
echo "key_mgmt=NONE"
;;
wpa)
if [[ "${#KEY}" -eq 64 ]]; then
echo "proto=RSN WPA\npsk=$KEY"
else
echo "proto=RSN WPA\npsk=\"$KEY\""
fi
;;
esac
# Hidden SSID
if checkyesno ${HIDDEN:-no}; then
echo "scan_ssid=1"
fi
}
# vim: ft=sh ts=4 et sw=4 tw=0:
|
