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<?php
/**
* Abstraction of PHP "posix" extension.
* Basic functionality substitution, but cannot get user/group names so falls back to numeric
*/
abstract class Loco_compat_PosixExtension {
/**
* @var int|null
*/
private static $uid = null;
/**
* @var int|null
*/
private static $gid = null;
/**
* @return int
*/
public static function getuid(){
if( is_null(self::$uid) ){
// use posix function if extension available
if( function_exists('posix_geteuid') ){
self::$uid = posix_geteuid();
}
// else use temp file system to establish owner
else {
self::$uid = self::getuidViaTempDir(); // @codeCoverageIgnore
}
}
return self::$uid;
}
/**
* @return int
*/
public static function getgid(){
if( is_null(self::$gid) ){
// use posix function if extension available
if( function_exists('posix_getegid') ){
self::$gid = posix_getegid();
}
// else use temp file system to establish group owner
else {
self::$gid = self::getgidViaTempDir(); // @codeCoverageIgnore
}
}
return self::$gid;
}
/**
* Attempt to get effective user ID by reading a temporary file
* @return int
*/
public static function getuidViaTempDir( $dir = '' ){
if( ! $dir ) {
$dir = get_temp_dir();
}
if( 04000 & fileperms($dir) ){
trigger_error( sprintf('%s directory has setuid bit, getuid may not be accurate',basename($dir) ) );
}
$path = wp_tempnam( 'loco-sniff-'.time(), $dir );
$uid = fileowner($path);
unlink( $path );
return $uid;
}
/**
* Attempt to get effective group ID by reading a temporary file
* @return int
*/
public static function getgidViaTempDir( $dir = '' ){
if( ! $dir ) {
$dir = get_temp_dir();
}
if( 02000 & fileperms($dir) ){
trigger_error( sprintf('%s directory has setgid bit, getgid may not be accurate',basename($dir) ) );
}
$path = wp_tempnam( 'loco-sniff-'.time(), $dir );
$gid = filegroup($path);
unlink( $path );
return $gid;
}
/**
* Get the name of the user that the web server runs under
* This is only for visual/info purposes.
* @return string
*/
public static function getHttpdUser(){
if( function_exists('posix_getpwuid') ){
$info = posix_getpwuid( self::getuid() );
if( isset($info['name']) ){
return $info['name'];
}
}
// @codeCoverageIgnoreStart
foreach( ['apache','nginx'] as $name ){
if( false !== stripos(PHP_SAPI,$name) ){
return $name;
}
if( isset($_SERVER['SERVER_SOFTWARE']) && false !== stripos($_SERVER['SERVER_SOFTWARE'],$name) ){
return $name;
}
}
// translators: used when username of web server process is unknown
return __('the web server','loco-translate');
// @codeCoverageIgnoreEnd
}
}
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