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|
# 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="${3:-COMPLETED}"
# CONDITION is required as wired connections are ready at ASSOCIATED not COMPLETED FS#20150
report_debug wpa_cli -p "$WPA_CTRL_PATH" -i "$INTERFACE" status
while (( timeout < TIMEOUT )); do
( # Sometimes wpa_supplicant isn't ready so silence errors for 2s only to avoid hiding real errors
if (( timeout < 2 )); then
eval $(wpa_cli -p "$WPA_CTRL_PATH" -i "$INTERFACE" status 2> /dev/null | fgrep "wpa_state=")
else
eval $(wpa_cli -p "$WPA_CTRL_PATH" -i "$INTERFACE" status | fgrep "wpa_state=")
fi
[[ "$wpa_state" = "$CONDITION" ]]
) && return 0
sleep 1
(( ++timeout ))
done
echo "$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="$3"
shift 3
local WPA_OPTS="$*"
if [[ -n "$WPA_CONF" ]]; then
WPA_CONF="-c$WPA_CONF"
else
WPA_CONF="-C$WPA_CTRL_PATH"
fi
wpa_supplicant -B -P "/run/wpa_supplicant_${INTERFACE}.pid" -i "$INTERFACE" -D "$WPA_DRIVER" "$WPA_CONF" $WPA_OPTS
# wait up to one second for the pid file to appear
timeout_wait 1 '[[ -f "/run/wpa_supplicant_${INTERFACE}.pid" ]]';
return $?
}
stop_wpa()
{
wpa_cli -p "$WPA_CTRL_PATH" -i "$1" terminate &> /dev/null
# wait up to one second for the pid file to be removed
timeout_wait 1 '[[ ! -f "/run/wpa_supplicant_$1.pid" ]]' || \
kill "$(< "/run/wpa_supplicant_$1.pid")" &>/dev/null &
}
wpa_reconfigure() {
local INTERFACE=$1
wpa_cli -p "$WPA_CTRL_PATH" -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 -p "$WPA_CTRL_PATH" -i "$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="$3" RETRIES=5 try scan_ok
scan_ok=0
report_debug wpa_cli -p "$WPA_CTRL_PATH" -i "$INTERFACE" scan
wpa_cli -p "$WPA_CTRL_PATH" -i "$INTERFACE" scan &> /dev/null
for ((try=0; try < $RETRIES; try++)); do
local found
sleep 2
found=$(wpa_cli -p "$WPA_CTRL_PATH" -i "$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 "$found"
return 0
fi
wpa_cli -p "$WPA_CTRL_PATH" -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="$2" spawned_wpa=0 essids
# temp file used, as keeping ESSID's with spaces in their name in arrays
# is hard, obscure and kinda nasty. This is simpler and clearer.
[[ -z "$INTERFACE" ]] && return 1
essids=$(mktemp --tmpdir essid.XXXXXXXX)
if [[ "$(wpa_cli -p "$WPA_CTRL_PATH" -i "$INTERFACE" ping 2> /dev/null)" != "PONG" ]]; then
start_wpa "$INTERFACE" "" "${WPA_DRIVER:-nl80211,wext}" || return 1
spawned_wpa=1
fi
wpa_cli -p "$WPA_CTRL_PATH" -i "$INTERFACE" scan &> /dev/null
# Wait at least 3 seconds for scan results
sleep 3
# Sometimes, that is not enough (FS#29946)
timeout_wait 7 '! wpa_cli -p "$WPA_CTRL_PATH" -i "$INTERFACE" status | grep -q "wpa_state=SCANNING"'
wpa_cli -p "$WPA_CTRL_PATH" -i "$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
(( $spawned_wpa == 1 )) && stop_wpa "$INTERFACE"
# 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.${interface}" # substitute spaces out
# make empty tmp dir with correct permissions, rename it
check_make_state_dir
mkdir -p /run/wpa_supplicant
rm -rf "$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 $SECURITY in
none|wep|wpa)
case "${ESSID_TYPE:-ascii}" in
ascii)
echo "ssid=\"$ESSID\""
;;
hex)
# Hex ESSID is written unquoted and in lowercase (FS#24333)
echo "ssid=${ESSID,,}"
;;
*)
report_fail "ESSID_TYPE must be set to 'ascii' or 'hex'."
return 1
;;
esac
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
none)
echo "key_mgmt=NONE"
;;
wep)
echo "key_mgmt=NONE"
echo "wep_tx_keyidx=0"
if [[ ${KEY:0:2} == "s:" ]]; then # TODO: does wpa_supplicant handle this as expected?
echo "wep_key0=\"${KEY:2}\""
else
echo "wep_key0=$KEY"
fi
;;
wpa)
echo "proto=RSN WPA"
if [[ "${#KEY}" -eq 64 ]]; then
echo "psk=$KEY"
else
echo "psk=\"$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:
|
