path: root/src/8021x

# 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
    sleep 1

    if [[ ! -f "/run/wpa_supplicant_${INTERFACE}.pid" ]]; then
        return 1
    fi
}

stop_wpa()
{
    wpa_cli -p "$WPA_CTRL_PATH" -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=$1
    wpa_cli -p "$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 scan_wait
    # 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)
    for (( scan_wait = 3; scan_wait < 10; scan_wait++ )); do
        wpa_cli -p "$WPA_CTRL_PATH" -i "$INTERFACE" status | grep -q "wpa_state=SCANNING" || break
        sleep 1
    done
    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=\"$ESSID\""
                ;;
            hex)
            # Hex ESSID is written unquoted ans lowercase (FS#24333)
                echo "ssid=${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
}

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