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<?php
/* Functions for Networking */
/**
* Get a human readable data size string from a number of bytes.
*
* @param long $numbytes The number of bytes.
* @param int $precision The number of numbers to round to after the dot/comma.
* @return string Data size in units: PB, TB, GB, MB or KB otherwise an empty string.
*/
function getHumanReadableDatasize($numbytes, $precision = 2)
{
$humanDatasize = '';
$kib = 1024;
$mib = $kib * 1024;
$gib = $mib * 1024;
$tib = $gib * 1024;
$pib = $tib * 1024;
if ($numbytes >= $pib) {
$humanDatasize = ' ('.round($numbytes / $pib, $precision).' PB)';
} elseif ($numbytes >= $tib) {
$humanDatasize = ' ('.round($numbytes / $tib, $precision).' TB)';
} elseif ($numbytes >= $gib) {
$humanDatasize = ' ('.round($numbytes / $gib, $precision).' GB)';
} elseif ($numbytes >= $mib) {
$humanDatasize = ' ('.round($numbytes / $mib, $precision).' MB)';
} elseif ($numbytes >= $kib) {
$humanDatasize = ' ('.round($numbytes / $kib, $precision).' KB)';
}
return $humanDatasize;
}
/**
* Converts a netmask to CIDR notation string
*
* @param string $mask
* @return string
*/
function mask2cidr($mask)
{
$long = ip2long($mask);
$base = ip2long('255.255.255.255');
return 32-log(($long ^ $base)+1, 2);
}
/**
* Converts a CIDR notation string to a netmask
*
* @param string $cidr
* @return string
*/
function cidr2mask($cidr)
{
$ta = substr ($cidr, strpos ($cidr, '/') + 1) * 1;
$netmask = str_split (str_pad (str_pad ('', $ta, '1'), 32, '0'), 8);
foreach ($netmask as &$element)
$element = bindec ($element);
return join ('.', $netmask);
}
/**
* Removes a dhcp configuration block for the specified interface
*
* @param string $iface
* @param object $status
* @return boolean $result
*/
function removeDHCPConfig($iface,$status)
{
$dhcp_cfg = file_get_contents(RASPI_DHCPCD_CONFIG);
$dhcp_cfg = preg_replace('/^#\sRaspAP\s'.$iface.'\s.*?(?=\s*^\s*$)([\s]+)/ms', '', $dhcp_cfg, 1);
file_put_contents("/tmp/dhcpddata", $dhcp_cfg);
system('sudo cp /tmp/dhcpddata '.RASPI_DHCPCD_CONFIG, $result);
if ($result == 0) {
$status->addMessage('DHCP configuration for '.$iface.' removed.', 'success');
} else {
$status->addMessage('Failed to remove DHCP configuration for '.$iface.'.', 'danger');
return $result;
}
}
/**
* Removes a dhcp configuration block for the specified interface
*
* @param string $dhcp_cfg
* @param string $iface
* @return string $dhcp_cfg
*/
function removeDHCPIface($dhcp_cfg,$iface)
{
$dhcp_cfg = preg_replace('/^#\sRaspAP\s'.$iface.'\s.*?(?=\s*^\s*$)([\s]+)/ms', '', $dhcp_cfg, 1);
return $dhcp_cfg;
}
/**
* Removes a dnsmasq configuration block for the specified interface
*
* @param string $iface
* @param object $status
* @return boolean $result
*/
function removeDnsmasqConfig($iface,$status)
{
system('sudo rm '.RASPI_DNSMASQ_PREFIX.$iface.'.conf', $result);
if ($result == 0) {
$status->addMessage('Dnsmasq configuration for '.$iface.' removed.', 'success');
} else {
$status->addMessage('Failed to remove dnsmasq configuration for '.$iface.'.', 'danger');
}
return $result;
}
/**
* Scans dnsmasq configuration dir for the specified interface
* Non-matching configs are removed, optional adblock.conf is protected
*
* @param string $dir_conf
* @param string $interface
* @param object $status
*/
function scanConfigDir($dir_conf,$interface,$status)
{
$syscnf = preg_grep('~\.(conf)$~', scandir($dir_conf));
foreach ($syscnf as $cnf) {
if ($cnf !== '090_adblock.conf' && !preg_match('/.*_'.$interface.'.conf/', $cnf)) {
system('sudo rm /etc/dnsmasq.d/'.$cnf, $result);
}
}
return $status;
}
/**
* Returns a default (fallback) value for the selected service, interface & setting
* from /etc/raspap/networking/defaults.json
*
* @param string $svc
* @param string $iface
* @return string $value
*/
function getDefaultNetValue($svc,$iface,$key)
{
$json = json_decode(file_get_contents(RASPI_CONFIG_NETWORK), true);
if ($json === null) {
return false;
} else {
return $json[$svc][$iface][$key][0];
}
}
/**
* Returns default options for the specified service
*
* @param string $svc
* @param string $key
* @return object $json
*/
function getDefaultNetOpts($svc,$key)
{
$json = json_decode(file_get_contents(RASPI_CONFIG_NETWORK), true);
if ($json === null) {
return false;
} else {
return $json[$svc][$key];
}
}
/* Functions to write ini files */
/**
* Writes a configuration to an .ini file
*
* @param array $array
* @param string $file
* @return boolean
*/
function write_php_ini($array, $file)
{
$res = array();
foreach ($array as $key => $val) {
if (is_array($val)) {
$res[] = "[$key]";
foreach ($val as $skey => $sval) {
$res[] = "$skey = $sval";
}
} else {
$res[] = "$key = $val";
}
}
if (safefilerewrite($file, implode(PHP_EOL, $res))) {
return true;
} else {
return false;
}
}
/**
* Writes to a file without conflicts
*
* @param string $fileName
* @param string $dataToSave
* @return boolean
*/
function safefilerewrite($fileName, $dataToSave)
{
if ($fp = fopen($fileName, 'w')) {
$startTime = microtime(true);
do {
$canWrite = flock($fp, LOCK_EX);
// If lock not obtained sleep for 0 - 100 milliseconds, to avoid collision and CPU load
if (!$canWrite) {
usleep(round(rand(0, 100)*1000));
}
} while ((!$canWrite)and((microtime(true)-$startTime) < 5));
//file was locked so now we can store information
if ($canWrite) {
fwrite($fp, $dataToSave.PHP_EOL);
flock($fp, LOCK_UN);
}
fclose($fp);
return true;
} else {
return false;
}
}
/**
* Prepends data to a file if not exists
*
* @param string $filename
* @param string $dataToSave
* @return boolean
*/
function file_prepend_data($filename, $dataToSave)
{
$context = stream_context_create();
$file = fopen($filename, 'r', 1, $context);
$file_data = readfile($file);
if (!preg_match('/^'.$dataToSave.'/', $file_data)) {
$tmp_file = tempnam(sys_get_temp_dir(), 'php_prepend_');
file_put_contents($tmp_file, $dataToSave);
file_put_contents($tmp_file, $file, FILE_APPEND);
fclose($file);
unlink($filename);
rename($tmp_file, $filename);
return true;
} else {
return false;
}
}
/**
* Fetches a meta value from a file
*
* @param string $filename
* @param string $pattern
* @return string
*/
function file_get_meta($filename, $pattern)
{
if(file_exists($filename)) {
$context = stream_context_create();
$file_data = file_get_contents($filename, false, $context);
preg_match('/^'.$pattern.'/', $file_data, $matched);
return $matched[1];
} else {
return false;
}
}
/**
* Callback function for array_filter
*
* @param string $var
* @return filtered value
*/
function filter_comments($var)
{
return $var[0] != '#';
}
/**
* Saves a CSRF token in the session
*/
function ensureCSRFSessionToken()
{
if (empty($_SESSION['csrf_token'])) {
$_SESSION['csrf_token'] = bin2hex(random_bytes(32));
}
}
/**
* Add CSRF Token to form
*/
function CSRFTokenFieldTag()
{
$token = htmlspecialchars($_SESSION['csrf_token']);
return '<input type="hidden" name="csrf_token" value="' . $token . '">';
}
/**
* Retuns a CSRF meta tag (for use with xhr, for example)
*/
function CSRFMetaTag()
{
$token = htmlspecialchars($_SESSION['csrf_token']);
return '<meta name="csrf_token" content="' . $token . '">';
}
/**
* Validate CSRF Token
*/
function CSRFValidate()
{
$post_token = $_POST['csrf_token'];
$header_token = $_SERVER['HTTP_X_CSRF_TOKEN'];
if (empty($post_token) && empty($header_token)) {
return false;
}
$request_token = $post_token;
if (empty($post_token)) {
$request_token = $header_token;
}
if (hash_equals($_SESSION['csrf_token'], $request_token)) {
return true;
} else {
error_log('CSRF violation');
return false;
}
}
/**
* Should the request be CSRF-validated?
*/
function csrfValidateRequest()
{
$request_method = strtolower($_SERVER['REQUEST_METHOD']);
return in_array($request_method, [ "post", "put", "patch", "delete" ]);
}
/**
* Handle invalid CSRF
*/
function handleInvalidCSRFToken()
{
header('HTTP/1.1 500 Internal Server Error');
header('Content-Type: text/plain');
echo 'Invalid CSRF token';
exit;
}
/**
* Test whether array is associative
*/
function isAssoc($arr)
{
return array_keys($arr) !== range(0, count($arr) - 1);
}
/**
* Display a selector field for a form. Arguments are:
*
* @param string $name: Field name
* @param array $options: Array of options
* @param string $selected: Selected option (optional)
* @param string $id: $options is an associative array this should be the key
* @param string $event: onChange event (optional)
* @param string $disabled (optional)
*/
function SelectorOptions($name, $options, $selected = null, $id = null, $event = null, $disabled = null)
{
echo '<select class="form-control" name="'.htmlspecialchars($name, ENT_QUOTES).'"';
if (isset($id)) {
echo ' id="' . htmlspecialchars($id, ENT_QUOTES) .'"';
}
if (isset($event)) {
echo ' onChange="' . htmlspecialchars($event, ENT_QUOTES).'()"';
}
echo '>' , PHP_EOL;
foreach ($options as $opt => $label) {
$select = '';
$key = isAssoc($options) ? $opt : $label;
if ($key == $selected) {
$select = ' selected="selected"';
}
if ($key == $disabled) {
$disabled = ' disabled';
}
echo '<option value="'.htmlspecialchars($key, ENT_QUOTES).'"'.$select.$disabled.'>'.
htmlspecialchars($label, ENT_QUOTES).'</option>' , PHP_EOL;
}
echo '</select>' , PHP_EOL;
}
/**
*
* @param string $input
* @param string $string
* @param int $offset
* @param string $separator
* @return $string
*/
function GetDistString($input, $string, $offset, $separator)
{
$string = substr($input, strpos($input, $string)+$offset, strpos(substr($input, strpos($input, $string)+$offset), $separator));
return $string;
}
/**
*
* @param array $arrConfig
* @return $config
*/
function ParseConfig($arrConfig)
{
$config = array();
foreach ($arrConfig as $line) {
$line = trim($line);
if ($line == "" || $line[0] == "#") {
continue;
}
list($option, $value) = array_map("trim", explode("=", $line, 2));
if (empty($config[$option])) {
$config[$option] = $value ?: true;
} else {
if (!is_array($config[$option])) {
$config[$option] = [ $config[$option] ];
}
$config[$option][] = $value;
}
}
return $config;
}
/**
* Fetches DHCP configuration for an interface, returned as JSON data
*
* @param string $interface
* @return json $jsonData
*/
function getNetConfig($interface)
{
$URI = $_SERVER['REQUEST_SCHEME'].'://'.$_SERVER['SERVER_NAME'] .'/ajax/networking/get_netcfg.php?iface='.$interface;
$jsonData = file_get_contents($URI);
return $jsonData;
}
/**
*
* @param string $freq
* @return $channel
*/
function ConvertToChannel($freq)
{
if ($freq >= 2412 && $freq <= 2484) {
$channel = ($freq - 2407)/5;
} elseif ($freq >= 4915 && $freq <= 4980) {
$channel = ($freq - 4910)/5 + 182;
} elseif ($freq >= 5035 && $freq <= 5865) {
$channel = ($freq - 5030)/5 + 6;
} else {
$channel = -1;
}
if ($channel >= 1 && $channel <= 196) {
return $channel;
} else {
return 'Invalid Channel';
}
}
/**
* Converts WPA security string to readable format
*
* @param string $security
* @return string
*/
function ConvertToSecurity($security)
{
$options = array();
preg_match_all('/\[([^\]]+)\]/s', $security, $matches);
foreach ($matches[1] as $match) {
if (preg_match('/^(WPA\d?)/', $match, $protocol_match)) {
$protocol = $protocol_match[1];
$matchArr = explode('-', $match);
if (count($matchArr) > 2) {
$options[] = htmlspecialchars($protocol . ' ('. $matchArr[2] .')', ENT_QUOTES);
} else {
$options[] = htmlspecialchars($protocol, ENT_QUOTES);
}
}
}
if (count($options) === 0) {
// This could also be WEP but wpa_supplicant doesn't have a way to determine
// this.
// And you shouldn't be using WEP these days anyway.
return 'Open';
} else {
return implode(' / ', $options);
}
}
/**
* Renders a simple PHP template
*/
function renderTemplate($name, $__template_data = [])
{
$file = realpath(dirname(__FILE__) . "/../templates/$name.php");
if (!file_exists($file)) {
return "template $name ($file) not found";
}
if (is_array($__template_data)) {
extract($__template_data);
}
ob_start();
include $file;
return ob_get_clean();
}
function expandCacheKey($key)
{
return RASPI_CACHE_PATH . "/" . $key;
}
function hasCache($key)
{
$cacheKey = expandCacheKey($key);
return file_exists($cacheKey);
}
function readCache($key)
{
$cacheKey = expandCacheKey($key);
if (!file_exists($cacheKey)) {
return null;
}
return file_get_contents($cacheKey);
}
function writeCache($key, $data)
{
if (!file_exists(RASPI_CACHE_PATH)) {
mkdir(RASPI_CACHE_PATH, 0777, true);
$cacheKey = expandCacheKey($key);
file_put_contents($cacheKey, $data);
}
}
function deleteCache($key)
{
if (hasCache($key)) {
$cacheKey = expandCacheKey($key);
unlink($cacheKey);
}
}
function cache($key, $callback)
{
if (hasCache($key)) {
return readCache($key);
} else {
$data = $callback();
writeCache($key, $data);
return $data;
}
}
// insspired by
// http://markushedlund.com/dev/php-escapeshellarg-with-unicodeutf-8-support
function mb_escapeshellarg($arg)
{
$isWindows = strtolower(substr(PHP_OS, 0, 3)) === 'win';
if ($isWindows) {
return '"' . str_replace(array('"', '%'), '', $arg) . '"';
} else {
return "'" . str_replace("'", "'\\''", $arg) . "'";
}
}
function dnsServers()
{
$data = json_decode(file_get_contents("./config/dns-servers.json"));
return (array) $data;
}
function blocklistProviders()
{
$data = json_decode(file_get_contents("./config/blocklists.json"));
return (array) $data;
}
function optionsForSelect($options)
{
$html = "";
foreach ($options as $key => $value) {
// optgroup
if (is_array($value)) {
$html .= "<optgroup label=\"$key\">";
$html .= optionsForSelect($value);
$html .= "</optgroup>";
}
// option
else {
$key = is_int($key) ? $value : $key;
$html .= "<option value=\"$value\">$key</option>";
}
}
return $html;
}
function blocklistUpdated($file)
{
$blocklist = RASPI_CONFIG.'/adblock/'.$file;
if (file_exists($blocklist)) {
$lastModified = date ("F d Y H:i:s.", filemtime($blocklist));
$lastModified = formatDateAgo($lastModified);
return $lastModified;
} else {
return 'Never';
}
}
function formatDateAgo($datetime, $full = false)
{
$now = new DateTime;
$ago = new DateTime($datetime);
$diff = $now->diff($ago);
$diff->w = floor($diff->d / 7);
$diff->d -= $diff->w * 7;
$string = array(
'y' => 'year',
'm' => 'month',
'w' => 'week',
'd' => 'day',
'h' => 'hour',
'i' => 'minute',
's' => 'second',
);
foreach ($string as $k => &$v) {
if ($diff->$k) {
$v = $diff->$k . ' ' . $v . ($diff->$k > 1 ? 's' : '');
} else {
unset($string[$k]);
}
}
if (!$full) $string = array_slice($string, 0, 1);
return $string ? implode(', ', $string) . ' ago' : 'just now';
}
function getThemeOpt()
{
if (!isset($_COOKIE['theme'])) {
$theme = "custom.php";
} else {
$theme = $_COOKIE['theme'];
}
return 'app/css/'.htmlspecialchars($theme, ENT_QUOTES);
}
function getColorOpt()
{
if (!isset($_COOKIE['color'])) {
$color = "#2b8080";
} else {
$color = $_COOKIE['color'];
}
return $color;
}
function getSidebarState()
{
if ($_COOKIE['sidebarToggled'] == 'true' ) {
return"toggled";
}
}
// Returns bridged AP mode status
function getBridgedState()
{
$arrHostapdConf = parse_ini_file(RASPI_CONFIG.'/hostapd.ini');
// defaults to false
return $arrHostapdConf['BridgedEnable'];
}
/**
* Validates the format of a CIDR notation string
*
* @param string $cidr
* @return bool
*/
function validateCidr($cidr)
{
$parts = explode('/', $cidr);
if(count($parts) != 2) {
return false;
}
$ip = $parts[0];
$netmask = intval($parts[1]);
if($netmask < 0) {
return false;
}
if(filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
return $netmask <= 32;
}
if(filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
return $netmask <= 128;
}
return false;
}
// Validates a host or FQDN
function validate_host($host)
{
return preg_match('/^([a-z\d](-*[a-z\d])*)(\.([a-z\d](-*[a-z\d])*))*$/i', $host);
}
// Gets night mode toggle value
// @return boolean
function getNightmode()
{
if ($_COOKIE['theme'] == 'lightsout.css') {
return true;
} else {
return false;
}
}
// search array for matching string and return only first matching group
function preg_only_match($pat,$haystack)
{
$match = "";
if(!empty($haystack) && !empty($pat)) {
if(!is_array($haystack)) $haystack = array($haystack);
$str = preg_grep($pat,$haystack);
if (!empty($str) && preg_match($pat,array_shift($str),$match) === 1 ) $match = $match[1];
}
return $match;
}
// Sanitizes a string for QR encoding
// @param string $str
// @return string
function qr_encode($str)
{
return preg_replace('/(?<!\\\)([\":;,])/', '\\\\\1', $str);
}
function evalHexSequence($string) {
$evaluator = function ($input) {
return hex2bin($input[1]);
};
return preg_replace_callback('/\\\x(..)/', $evaluator, $string);
}
function hexSequence2lower($string) {
return preg_replace_callback('/\\\\x([0-9A-F]{2})/', function($b){ return '\x'.strtolower($b[1]); }, $string);
}
/* File upload callback object
*
*/
class validation
{
public function check_name_length($object)
{
if (strlen($object->file['filename']) > 255) {
$object->set_error('File name is too long.');
}
}
}
/* Resolves public IP address
*
* @return string $public_ip
*/
function get_public_ip()
{
exec('wget https://ipinfo.io/ip -qO -', $public_ip);
return $public_ip[0];
}