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<?php class AnyWay_DirectoryTraversal extends AnyWay_EventEmitter { public $root; public $file; public $exclude = array(); public $count = 0; public $symlink_stack = array(); private $cache = array(); private $changed = array(); private $restore = array(); public function __construct($options = array()) { if (!isset($options['root'])) throw new Exception("Directory to compress (root) not set"); if ($options['root'] != realpath($options['root'])) throw new Exception("No trailing slash allowed for compress root"); $this->root = $options['root']; if (isset($options['file']) && $options['file'] !== null) $this->file = $options['file']; if (isset($options['count']) && $options['count'] !== null) $this->count = $options['count']; if (isset($options['symlink_stack']) && $options['symlink_stack'] !== null) $this->symlink_stack = $options['symlink_stack']; if (isset($options['exclude']) && $options['exclude'] !== null) { $this->exclude = array(); foreach ((array)$options['exclude'] as $path) { if (preg_match('/^\//', $path)) { $this->exclude[] = $path; } elseif (preg_match('/^\.\//', $path)) { $this->exclude[] = $this->root . DIRECTORY_SEPARATOR . substr($path, 2); } else { $this->exclude[] = $this->root . DIRECTORY_SEPARATOR . $path; } } } //parent::__construct($options); } public function getState() { return array( 'root' => $this->root, 'file' => $this->file, 'exclude' => $this->exclude, 'count' => $this->count, 'symlink_stack' => $this->symlink_stack ); } public function makeReadable($path) { if (is_link($path)) { $path = static::getAbsolutePath($path, @readlink($path)); } if (is_readable($path)) return true; $stack = array($path); $tpath = $path; while (0 === strpos($tpath, $this->root)) { $tpath = dirname($tpath); if (is_readable($tpath)) { break; } $stack[] = $tpath; } while ($stack) { $tpath = array_pop($stack); clearstatcache(null, $tpath); $perms = (int)@fileperms($tpath); if (is_dir($tpath) && (@chmod($tpath, $perms \| 0700) \|\| @chmod($tpath, $perms \| 0070) \|\| @chmod($tpath, $perms \| 0007)) \|\| (@chmod($tpath, $perms \| 0400) \|\| @chmod($tpath, $perms \| 0040) \|\| @chmod($tpath, $perms \| 0004)) ) { if (!isset($this->changed[$tpath])) { $this->restore[] = array($tpath, $perms); $this->changed[$tpath] = $perms ? $perms : 0775; } clearstatcache(null, $tpath); } else { $this->emit("warning", "Cannot read " . str_replace($this->root, '', $tpath)); return false; } } return is_readable($path); } public function restorePermissions() { if ($this->restore) { usort($this->restore, function ($a, $b) { if (strlen($a[0]) == strlen($b[0])) return 0; return (strlen($a[0]) > strlen($b[0]) ? -1 : 1); }); foreach ($this->restore as $v) { list($path, $perms) = $v; @chmod($path, $perms); } $this->restore = array(); $this->changed = array(); } } public static function getAbsolutePath($realFile, $linkTo) { if (!preg_match('/^\//', $linkTo)) { $dir = dirname($realFile); while (preg_match('/^\.\.\//', $linkTo)) { $linkTo = preg_replace('/^\.\.\//', '', $linkTo); $dir = dirname($dir); } $linkTo = preg_replace('/[^\/+]\/\.\.\//', '', $linkTo); while (preg_match('/^\.\//', $linkTo)) { $linkTo = preg_replace('/^\.\//', '', $linkTo); } $linkTo = preg_replace('/\/\.\//', '/', $linkTo); $linkTo = $dir . DIRECTORY_SEPARATOR . $linkTo; } return $linkTo; } protected function getNextFromDirectoryCache($dir, $currentFile) { if (!isset($this->cache[$dir])) { if (!is_readable($dir) && !$this->makeReadable($dir)) { return false; } $this->cache[$dir] = array(); if (false !== ($dh = @opendir($dir))) { while (false !== ($filename = readdir($dh))) { if ($filename != '.' && $filename != '..' && strcmp($filename, $currentFile) > 0) { $realFile = $dir . DIRECTORY_SEPARATOR . $filename; if (is_readable($realFile) \|\| $this->makeReadable($realFile)) { $this->cache[$dir][] = $filename; } } } @closedir($dh); sort($this->cache[$dir]); } else { if ($error = error_get_last()) { $this->emit("warning", $error['message']); } } } while (true) { $filename = count($this->cache[$dir]) ? array_shift($this->cache[$dir]) : false; if (!$filename) return false; $realFile = $dir . DIRECTORY_SEPARATOR . $filename; foreach ($this->exclude as $path) { if (strpos($realFile, $path) === 0) continue 2; } if (is_link($realFile) && is_dir($realFile)) { if (count($this->symlink_stack) == 3) { continue; } else { $this->symlink_stack[] = $realFile; } } return $filename; } } protected function getSibling($directory) { $currentDir = dirname($directory); $currentFile = basename($directory); if (end($this->symlink_stack) == $directory) array_pop($this->symlink_stack); if ($next = $this->getNextFromDirectoryCache($currentDir, $currentFile)) { return substr_replace($currentDir . DIRECTORY_SEPARATOR . $next, '', 0, strlen($this->root) + 1); } else { return realpath($currentDir) == $this->root ? false : $this->getSibling($currentDir); } } public function getNextFile() { $currentFile = $this->root . DIRECTORY_SEPARATOR . $this->file; if (!is_readable($currentFile) && !$this->makeReadable($currentFile)) { throw new Exception("DirectoryTraversal: File $currentFile became unreadable between runs"); } $currentDir = is_dir($currentFile) // && !is_link($currentFile) ? preg_replace('/\/$/', '', $currentFile) : dirname($currentFile); $currentFile = is_dir($currentFile) // && !is_link($currentFile) ? '' : basename($currentFile); if ($next = $this->getNextFromDirectoryCache($currentDir, $currentFile)) { $this->count++; return $this->file = substr_replace($currentDir . DIRECTORY_SEPARATOR . $next, '', 0, strlen($this->root) + 1); } else { if (realpath($currentDir) == $this->root) return false; if (false === ($currentFile = $this->getSibling($currentDir))) return false; } $this->count++; // returning next sibling from $this->getSibling(); return $this->file = $currentFile; } public function realFile($filename) { return $this->root . DIRECTORY_SEPARATOR . $filename; } public function fileperms($filename) { return isset($this->changed[$filename]) ? $this->changed[$filename] : fileperms($filename); } public function __destruct() { $this->restorePermissions(); } }

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