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<?php
require_once 'functions.php';
function knownWifiStations(&$networks)
{
// Find currently configured networks
exec(' sudo cat ' . RASPI_WPA_SUPPLICANT_CONFIG, $known_return);
foreach ($known_return as $line) {
if (preg_match('/network\s*=/', $line)) {
$network = array('visible' => false, 'configured' => true, 'connected' => false);
} elseif (isset($network) && $network !== null) {
if (preg_match('/^\s*}\s*$/', $line)) {
$networks[$ssid] = $network;
$network = null;
$ssid = null;
} elseif ($lineArr = preg_split('/\s*=\s*/', trim($line))) {
switch (strtolower($lineArr[0])) {
case 'ssid':
$ssid = trim($lineArr[1], '"');
break;
case 'psk':
if (array_key_exists('passphrase', $network)) {
break;
}
case '#psk':
$network['protocol'] = 'WPA';
case 'wep_key0': // Untested
$network['passphrase'] = trim($lineArr[1], '"');
break;
case 'key_mgmt':
if (! array_key_exists('passphrase', $network) && $lineArr[1] === 'NONE') {
$network['protocol'] = 'Open';
}
break;
case 'priority':
$network['priority'] = trim($lineArr[1], '"');
break;
}
}
}
}
}
function nearbyWifiStations(&$networks, $cached = true)
{
$cacheTime = filemtime(RASPI_WPA_SUPPLICANT_CONFIG);
$cacheKey = "nearby_wifi_stations_$cacheTime";
if ($cached == false) {
deleteCache($cacheKey);
}
$scan_results = cache(
$cacheKey, function () {
exec('sudo wpa_cli -i ' .$_SESSION['wifi_client_interface']. ' scan');
sleep(3);
exec('sudo wpa_cli -i ' .$_SESSION['wifi_client_interface']. ' scan_results', $stdout);
array_shift($stdout);
return implode("\n", $stdout);
}
);
// get the name of the AP. Should be excluded from nearby networks
exec('cat '.RASPI_HOSTAPD_CONFIG.' | sed -rn "s/ssid=(.*)\s*$/\1/p" ', $ap_ssid);
$ap_ssid = $ap_ssid[0];
foreach (explode("\n", $scan_results) as $network) {
$arrNetwork = preg_split("/[\t]+/", $network); // split result into array
if (!array_key_exists(4, $arrNetwork) ||
trim($arrNetwork[4]) == $ap_ssid) {
continue;
}
$ssid = trim($arrNetwork[4]);
// filter SSID string: anything invisible in 7bit ASCII or quotes -> ignore network
if (preg_match('[\x00-\x1f\x7f-\xff\'\`\´\"]', $ssid)) {
continue;
}
// If network is saved
if (array_key_exists($ssid, $networks)) {
$networks[$ssid]['visible'] = true;
$networks[$ssid]['channel'] = ConvertToChannel($arrNetwork[1]);
// TODO What if the security has changed?
} else {
$networks[$ssid] = array(
'configured' => false,
'protocol' => ConvertToSecurity($arrNetwork[3]),
'channel' => ConvertToChannel($arrNetwork[1]),
'passphrase' => '',
'visible' => true,
'connected' => false
);
}
// Save RSSI, if the current value is larger than the already stored
if (array_key_exists(4, $arrNetwork) && array_key_exists($arrNetwork[4], $networks)) {
if (! array_key_exists('RSSI', $networks[$arrNetwork[4]]) || $networks[$ssid]['RSSI'] < $arrNetwork[2]) {
$networks[$ssid]['RSSI'] = $arrNetwork[2];
}
}
}
}
function connectedWifiStations(&$networks)
{
exec('iwconfig ' .$_SESSION['wifi_client_interface'], $iwconfig_return);
foreach ($iwconfig_return as $line) {
if (preg_match('/ESSID:\"([^"]+)\"/i', $line, $iwconfig_ssid)) {
$networks[$iwconfig_ssid[1]]['connected'] = true;
}
}
}
function sortNetworksByRSSI(&$networks)
{
$valRSSI = array();
foreach ($networks as $SSID => $net) {
if (!array_key_exists('RSSI', $net)) {
$net['RSSI'] = -1000;
}
$valRSSI[$SSID] = $net['RSSI'];
}
$nets = $networks;
arsort($valRSSI);
$networks = array();
foreach ($valRSSI as $SSID => $RSSI) {
$networks[$SSID] = $nets[$SSID];
$networks[$SSID]['RSSI'] = $RSSI;
}
}
/*
* Determines the configured wireless AP interface
*
* If not saved in /etc/raspap/hostapd.ini, check for a second
* wireless interface with iw dev. Fallback to the constant
* value defined in config.php
*/
function getWifiInterface()
{
$arrHostapdConf = parse_ini_file(RASPI_CONFIG.'/hostapd.ini');
$iface = $_SESSION['ap_interface'] = isset($arrHostapdConf['WifiInterface']) ? $arrHostapdConf['WifiInterface'] : RASPI_WIFI_AP_INTERFACE;
// check for 2nd wifi interface -> wifi client on different interface
exec("iw dev | awk '$1==\"Interface\" && $2!=\"$iface\" {print $2}'",$iface2);
$client_iface = $_SESSION['wifi_client_interface'] = (empty($iface2) ? $iface : trim($iface2[0]));
// specifically for rpi0W in AP-STA mode, the above check ends up with the interfaces
// crossed over (wifi_client_interface vs 'ap_interface'), because the second interface (uap0) is
// created by raspap and used as the access point.
if ($client_iface == "uap0" && ($arrHostapdConf['WifiAPEnable'] ?? 0)){
$_SESSION['wifi_client_interface'] = $iface;
$_SESSION['ap_interface'] = $client_iface;
}
}
?>