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
}

# 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=$1
    local WPA_CONF="${TMPDIR:-/tmp}/wpa.${interface}" # substitute spaces out

    # make empty tmp dir with correct permissions, rename it
    rm -rf "$WPA_CONF"
    mv -f "$(mktemp -d)" "$WPA_CONF" || return 1
    echo "ctrl_interface=/run/wpa_supplicant" >> "$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: