238 lines
7.9 KiB
PHP
Executable File
238 lines
7.9 KiB
PHP
Executable File
<?php
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require_once 'functions.php';
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const MIN_RSSI = -100;
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const MAX_RSSI = -55;
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function knownWifiStations(&$networks)
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{
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// Find currently configured networks
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exec(' sudo cat ' . RASPI_WPA_SUPPLICANT_CONFIG, $known_return);
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$index = 0;
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foreach ($known_return as $line) {
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if (preg_match('/network\s*=/', $line)) {
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$network = array('visible' => false, 'configured' => true, 'connected' => false, 'index' => $index);
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++$index;
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} elseif (isset($network) && $network !== null) {
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if (preg_match('/^\s*}\s*$/', $line)) {
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$networks[$ssid] = $network;
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$network = null;
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$ssid = null;
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} elseif ($lineArr = preg_split('/\s*=\s*/', trim($line), 2)) {
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switch (strtolower($lineArr[0])) {
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case 'ssid':
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$ssid = trim($lineArr[1], '"');
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$ssid = str_replace('P"','',$ssid);
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$network['ssid'] = $ssid;
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break;
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case 'psk':
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$network['passkey'] = trim($lineArr[1]);
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$network['protocol'] = 'WPA';
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break;
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case '#psk':
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$network['protocol'] = 'WPA';
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case 'wep_key0': // Untested
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$network['passphrase'] = trim($lineArr[1], '"');
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break;
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case 'key_mgmt':
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if (! array_key_exists('passphrase', $network) && $lineArr[1] === 'NONE') {
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$network['protocol'] = 'Open';
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}
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break;
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case 'priority':
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$network['priority'] = trim($lineArr[1], '"');
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break;
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}
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}
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}
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}
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}
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function nearbyWifiStations(&$networks, $cached = true)
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{
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$cacheTime = filemtime(RASPI_WPA_SUPPLICANT_CONFIG);
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$cacheKey = "nearby_wifi_stations_$cacheTime";
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if ($cached == false) {
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deleteCache($cacheKey);
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}
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$scan_results = cache(
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$cacheKey, function () {
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exec('sudo wpa_cli -i ' .$_SESSION['wifi_client_interface']. ' scan');
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sleep(3);
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$stdout = shell_exec('sudo wpa_cli -i ' .$_SESSION['wifi_client_interface']. ' scan_results');
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return preg_split("/\n/", $stdout);
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}
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);
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// get the name of the AP. Should be excluded from nearby networks
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exec('cat '.RASPI_HOSTAPD_CONFIG.' | sed -rn "s/ssid=(.*)\s*$/\1/p" ', $ap_ssid);
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$ap_ssid = $ap_ssid[0];
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$index = 0;
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if ( !empty($networks) ) {
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$lastnet = end($networks);
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if ( isset($lastnet['index']) ) $index = $lastnet['index'] + 1;
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}
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if (is_array($scan_results)) {
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array_shift($scan_results);
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foreach ($scan_results as $network) {
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$arrNetwork = preg_split("/[\t]+/", $network); // split result into array
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$ssid = $arrNetwork[4];
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// exclude raspap ssid
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if (empty($ssid) || $ssid == $ap_ssid) {
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continue;
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}
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// filter SSID string: unprintable 7bit ASCII control codes, delete or quotes -> ignore network
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if (preg_match('[\x00-\x1f\x7f\'\`\´\"]', $ssid)) {
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continue;
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}
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// If network is saved
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if (array_key_exists($ssid, $networks)) {
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$networks[$ssid]['visible'] = true;
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$networks[$ssid]['channel'] = ConvertToChannel($arrNetwork[1]);
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// TODO What if the security has changed?
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} else {
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$networks[$ssid] = array(
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'ssid' => $ssid,
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'configured' => false,
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'protocol' => ConvertToSecurity($arrNetwork[3]),
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'channel' => ConvertToChannel($arrNetwork[1]),
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'passphrase' => '',
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'visible' => true,
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'connected' => false,
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'index' => $index
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);
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++$index;
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}
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// Save RSSI, if the current value is larger than the already stored
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if (array_key_exists(4, $arrNetwork) && array_key_exists($arrNetwork[4], $networks)) {
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if (! array_key_exists('RSSI', $networks[$arrNetwork[4]]) || $networks[$ssid]['RSSI'] < $arrNetwork[2]) {
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$networks[$ssid]['RSSI'] = $arrNetwork[2];
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}
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}
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}
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}
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}
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function connectedWifiStations(&$networks)
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{
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exec('iwconfig ' .$_SESSION['wifi_client_interface'], $iwconfig_return);
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foreach ($iwconfig_return as $line) {
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if (preg_match('/ESSID:\"([^"]+)\"/i', $line, $iwconfig_ssid)) {
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$networks[hexSequence2lower($iwconfig_ssid[1])]['connected'] = true;
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}
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}
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}
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function sortNetworksByRSSI(&$networks)
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{
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$valRSSI = array();
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foreach ($networks as $SSID => $net) {
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if (!array_key_exists('RSSI', $net)) {
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$net['RSSI'] = -1000;
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}
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$valRSSI[$SSID] = $net['RSSI'];
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}
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$nets = $networks;
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arsort($valRSSI);
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$networks = array();
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foreach ($valRSSI as $SSID => $RSSI) {
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$networks[$SSID] = $nets[$SSID];
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$networks[$SSID]['RSSI'] = $RSSI;
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}
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}
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/*
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* Determines the configured wireless AP interface
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*
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* If not saved in /etc/raspap/hostapd.ini, check for a second
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* wireless interface with iw dev. Fallback to the constant
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* value defined in config.php
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*/
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function getWifiInterface()
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{
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$arrHostapdConf = parse_ini_file(RASPI_CONFIG.'/hostapd.ini');
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$iface = $_SESSION['ap_interface'] = isset($arrHostapdConf['WifiInterface']) ? $arrHostapdConf['WifiInterface'] : RASPI_WIFI_AP_INTERFACE;
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// check for 2nd wifi interface -> wifi client on different interface
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exec("iw dev | awk '$1==\"Interface\" && $2!=\"$iface\" {print $2}'",$iface2);
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$client_iface = $_SESSION['wifi_client_interface'] = (empty($iface2) ? $iface : trim($iface2[0]));
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// specifically for rpi0W in AP-STA mode, the above check ends up with the interfaces
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// crossed over (wifi_client_interface vs 'ap_interface'), because the second interface (uap0) is
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// created by raspap and used as the access point.
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if ($client_iface == "uap0" && ($arrHostapdConf['WifiAPEnable'] ?? 0)){
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$_SESSION['wifi_client_interface'] = $iface;
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$_SESSION['ap_interface'] = $client_iface;
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}
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}
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/*
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* Reinitializes wpa_supplicant for the wireless client interface
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* The 'force' parameter deletes the socket in /var/run/wpa_supplicant/
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*
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* @param boolean $force
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*/
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function reinitializeWPA($force)
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{
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if ($force == true) {
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$cmd = escapeshellcmd("sudo /bin/rm /var/run/wpa_supplicant/".$_SESSION['wifi_client_interface']);
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$result = exec($cmd);
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}
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$cmd = escapeshellcmd("sudo /sbin/wpa_supplicant -B -Dnl80211,wext -c/etc/wpa_supplicant/wpa_supplicant.conf -i". $_SESSION['wifi_client_interface']);
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$result = shell_exec($cmd);
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return $result;
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}
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/*
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* Replace escaped bytes (hex) by binary - assume UTF8 encoding
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*
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* @param string $ssid
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*/
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function ssid2utf8($ssid)
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{
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return evalHexSequence($ssid);
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}
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/*
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* Returns a signal strength indicator based on RSSI value
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*
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* @param string $rssi
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*/
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function getSignalBars($rssi)
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{
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// assign css class based on RSSI value
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if ($rssi >= MAX_RSSI) {
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$class = 'strong';
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} elseif ($rssi >= -56) {
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$class = 'medium';
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} elseif ($rssi >= -67) {
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$class = 'weak';
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} elseif ($rssi >= -89) {
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$class = '';
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}
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// calculate percent strength
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if ($rssi >= -50) {
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$pct = 100;
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} elseif ($rssi <= MIN_RSSI) {
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$pct = 0;
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} else {
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$pct = 2*($rssi + 100);
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}
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$elem = '<div data-toggle="tooltip" title="' . _("Signal strength"). ': ' .$pct. '%" class="signal-icon ' .$class. '">'.PHP_EOL;
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for ($n = 0; $n < 3; $n++ ) {
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$elem .= '<div class="signal-bar"></div>'.PHP_EOL;
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}
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$elem .= '</div>'.PHP_EOL;
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return $elem;
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}
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