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<?php
/*
* This file is part of composer/xdebug-handler.
*
* (c) Composer <https://github.com/composer>
*
* For the full copyright and license information, please view
* the LICENSE file that was distributed with this source code.
*/
declare(strict_types=1);
namespace Composer\XdebugHandler;
use Composer\Pcre\Preg;
use Psr\Log\LoggerInterface;
/**
* @author John Stevenson <[email protected]>
*
* @phpstan-import-type restartData from PhpConfig
*/
class XdebugHandler
{
const SUFFIX_ALLOW = '_ALLOW_XDEBUG';
const SUFFIX_INIS = '_ORIGINAL_INIS';
const RESTART_ID = 'internal';
const RESTART_SETTINGS = 'XDEBUG_HANDLER_SETTINGS';
const DEBUG = 'XDEBUG_HANDLER_DEBUG';
/** @var string|null */
protected $tmpIni;
/** @var bool */
private static $inRestart;
/** @var string */
private static $name;
/** @var string|null */
private static $skipped;
/** @var bool */
private static $xdebugActive;
/** @var string|null */
private static $xdebugMode;
/** @var string|null */
private static $xdebugVersion;
/** @var bool */
private $cli;
/** @var string|null */
private $debug;
/** @var string */
private $envAllowXdebug;
/** @var string */
private $envOriginalInis;
/** @var bool */
private $persistent;
/** @var string|null */
private $script;
/** @var Status */
private $statusWriter;
/**
* Constructor
*
* The $envPrefix is used to create distinct environment variables. It is
* uppercased and prepended to the default base values. For example 'myapp'
* would result in MYAPP_ALLOW_XDEBUG and MYAPP_ORIGINAL_INIS.
*
* @param string $envPrefix Value used in environment variables
* @throws \RuntimeException If the parameter is invalid
*/
public function __construct(string $envPrefix)
{
if ($envPrefix === '') {
throw new \RuntimeException('Invalid constructor parameter');
}
self::$name = strtoupper($envPrefix);
$this->envAllowXdebug = self::$name.self::SUFFIX_ALLOW;
$this->envOriginalInis = self::$name.self::SUFFIX_INIS;
self::setXdebugDetails();
self::$inRestart = false;
if ($this->cli = PHP_SAPI === 'cli') {
$this->debug = (string) getenv(self::DEBUG);
}
$this->statusWriter = new Status($this->envAllowXdebug, (bool) $this->debug);
}
/**
* Activates status message output to a PSR3 logger
*/
public function setLogger(LoggerInterface $logger): self
{
$this->statusWriter->setLogger($logger);
return $this;
}
/**
* Sets the main script location if it cannot be called from argv
*/
public function setMainScript(string $script): self
{
$this->script = $script;
return $this;
}
/**
* Persist the settings to keep Xdebug out of sub-processes
*/
public function setPersistent(): self
{
$this->persistent = true;
return $this;
}
/**
* Checks if Xdebug is loaded and the process needs to be restarted
*
* This behaviour can be disabled by setting the MYAPP_ALLOW_XDEBUG
* environment variable to 1. This variable is used internally so that
* the restarted process is created only once.
*/
public function check(): void
{
$this->notify(Status::CHECK, self::$xdebugVersion.'|'.self::$xdebugMode);
$envArgs = explode('|', (string) getenv($this->envAllowXdebug));
if (!((bool) $envArgs[0]) && $this->requiresRestart(self::$xdebugActive)) {
// Restart required
$this->notify(Status::RESTART);
if ($this->prepareRestart()) {
$command = $this->getCommand();
$this->restart($command);
}
return;
}
if (self::RESTART_ID === $envArgs[0] && count($envArgs) === 5) {
// Restarted, so unset environment variable and use saved values
$this->notify(Status::RESTARTED);
Process::setEnv($this->envAllowXdebug);
self::$inRestart = true;
if (self::$xdebugVersion === null) {
// Skipped version is only set if Xdebug is not loaded
self::$skipped = $envArgs[1];
}
$this->tryEnableSignals();
// Put restart settings in the environment
$this->setEnvRestartSettings($envArgs);
return;
}
$this->notify(Status::NORESTART);
$settings = self::getRestartSettings();
if ($settings !== null) {
// Called with existing settings, so sync our settings
$this->syncSettings($settings);
}
}
/**
* Returns an array of php.ini locations with at least one entry
*
* The equivalent of calling php_ini_loaded_file then php_ini_scanned_files.
* The loaded ini location is the first entry and may be empty.
*
* @return string[]
*/
public static function getAllIniFiles(): array
{
if (self::$name !== null) {
$env = getenv(self::$name.self::SUFFIX_INIS);
if (false !== $env) {
return explode(PATH_SEPARATOR, $env);
}
}
$paths = [(string) php_ini_loaded_file()];
$scanned = php_ini_scanned_files();
if ($scanned !== false) {
$paths = array_merge($paths, array_map('trim', explode(',', $scanned)));
}
return $paths;
}
/**
* Returns an array of restart settings or null
*
* Settings will be available if the current process was restarted, or
* called with the settings from an existing restart.
*
* @phpstan-return restartData|null
*/
public static function getRestartSettings(): ?array
{
$envArgs = explode('|', (string) getenv(self::RESTART_SETTINGS));
if (count($envArgs) !== 6
|| (!self::$inRestart && php_ini_loaded_file() !== $envArgs[0])) {
return null;
}
return [
'tmpIni' => $envArgs[0],
'scannedInis' => (bool) $envArgs[1],
'scanDir' => '*' === $envArgs[2] ? false : $envArgs[2],
'phprc' => '*' === $envArgs[3] ? false : $envArgs[3],
'inis' => explode(PATH_SEPARATOR, $envArgs[4]),
'skipped' => $envArgs[5],
];
}
/**
* Returns the Xdebug version that triggered a successful restart
*/
public static function getSkippedVersion(): string
{
return (string) self::$skipped;
}
/**
* Returns whether Xdebug is loaded and active
*
* true: if Xdebug is loaded and is running in an active mode.
* false: if Xdebug is not loaded, or it is running with xdebug.mode=off.
*/
public static function isXdebugActive(): bool
{
self::setXdebugDetails();
return self::$xdebugActive;
}
/**
* Allows an extending class to decide if there should be a restart
*
* The default is to restart if Xdebug is loaded and its mode is not "off".
*/
protected function requiresRestart(bool $default): bool
{
return $default;
}
/**
* Allows an extending class to access the tmpIni
*
* @param string[] $command *
*/
protected function restart(array $command): void
{
$this->doRestart($command);
}
/**
* Executes the restarted command then deletes the tmp ini
*
* @param string[] $command
* @phpstan-return never
*/
private function doRestart(array $command): void
{
$this->tryEnableSignals();
$this->notify(Status::RESTARTING, implode(' ', $command));
if (PHP_VERSION_ID >= 70400) {
$cmd = $command;
} else {
$cmd = Process::escapeShellCommand($command);
if (defined('PHP_WINDOWS_VERSION_BUILD')) {
// Outer quotes required on cmd string below PHP 8
$cmd = '"'.$cmd.'"';
}
}
$process = proc_open($cmd, [], $pipes);
if (is_resource($process)) {
$exitCode = proc_close($process);
}
if (!isset($exitCode)) {
// Unlikely that php or the default shell cannot be invoked
$this->notify(Status::ERROR, 'Unable to restart process');
$exitCode = -1;
} else {
$this->notify(Status::INFO, 'Restarted process exited '.$exitCode);
}
if ($this->debug === '2') {
$this->notify(Status::INFO, 'Temp ini saved: '.$this->tmpIni);
} else {
@unlink((string) $this->tmpIni);
}
exit($exitCode);
}
/**
* Returns true if everything was written for the restart
*
* If any of the following fails (however unlikely) we must return false to
* stop potential recursion:
* - tmp ini file creation
* - environment variable creation
*/
private function prepareRestart(): bool
{
$error = null;
$iniFiles = self::getAllIniFiles();
$scannedInis = count($iniFiles) > 1;
$tmpDir = sys_get_temp_dir();
if (!$this->cli) {
$error = 'Unsupported SAPI: '.PHP_SAPI;
} elseif (!$this->checkConfiguration($info)) {
$error = $info;
} elseif (!$this->checkMainScript()) {
$error = 'Unable to access main script: '.$this->script;
} elseif (!$this->writeTmpIni($iniFiles, $tmpDir, $error)) {
$error = $error !== null ? $error : 'Unable to create temp ini file at: '.$tmpDir;
} elseif (!$this->setEnvironment($scannedInis, $iniFiles)) {
$error = 'Unable to set environment variables';
}
if ($error !== null) {
$this->notify(Status::ERROR, $error);
}
return $error === null;
}
/**
* Returns true if the tmp ini file was written
*
* @param string[] $iniFiles All ini files used in the current process
*/
private function writeTmpIni(array $iniFiles, string $tmpDir, ?string &$error): bool
{
if (($tmpfile = @tempnam($tmpDir, '')) === false) {
return false;
}
$this->tmpIni = $tmpfile;
// $iniFiles has at least one item and it may be empty
if ($iniFiles[0] === '') {
array_shift($iniFiles);
}
$content = '';
$sectionRegex = '/^\s*\[(?:PATH|HOST)\s*=/mi';
$xdebugRegex = '/^\s*(zend_extension\s*=.*xdebug.*)$/mi';
foreach ($iniFiles as $file) {
// Check for inaccessible ini files
if (($data = @file_get_contents($file)) === false) {
$error = 'Unable to read ini: '.$file;
return false;
}
// Check and remove directives after HOST and PATH sections
if (Preg::isMatchWithOffsets($sectionRegex, $data, $matches, PREG_OFFSET_CAPTURE)) {
$data = substr($data, 0, $matches[0][1]);
}
$content .= Preg::replace($xdebugRegex, ';$1', $data).PHP_EOL;
}
// Merge loaded settings into our ini content, if it is valid
$config = parse_ini_string($content);
$loaded = ini_get_all(null, false);
if (false === $config || false === $loaded) {
$error = 'Unable to parse ini data';
return false;
}
$content .= $this->mergeLoadedConfig($loaded, $config);
// Work-around for https://bugs.php.net/bug.php?id=75932
$content .= 'opcache.enable_cli=0'.PHP_EOL;
return (bool) @file_put_contents($this->tmpIni, $content);
}
/**
* Returns the command line arguments for the restart
*
* @return string[]
*/
private function getCommand(): array
{
$php = [PHP_BINARY];
$args = array_slice($_SERVER['argv'], 1);
if (!$this->persistent) {
// Use command-line options
array_push($php, '-n', '-c', $this->tmpIni);
}
return array_merge($php, [$this->script], $args);
}
/**
* Returns true if the restart environment variables were set
*
* No need to update $_SERVER since this is set in the restarted process.
*
* @param string[] $iniFiles All ini files used in the current process
*/
private function setEnvironment(bool $scannedInis, array $iniFiles): bool
{
$scanDir = getenv('PHP_INI_SCAN_DIR');
$phprc = getenv('PHPRC');
// Make original inis available to restarted process
if (!putenv($this->envOriginalInis.'='.implode(PATH_SEPARATOR, $iniFiles))) {
return false;
}
if ($this->persistent) {
// Use the environment to persist the settings
if (!putenv('PHP_INI_SCAN_DIR=') || !putenv('PHPRC='.$this->tmpIni)) {
return false;
}
}
// Flag restarted process and save values for it to use
$envArgs = [
self::RESTART_ID,
self::$xdebugVersion,
(int) $scannedInis,
false === $scanDir ? '*' : $scanDir,
false === $phprc ? '*' : $phprc,
];
return putenv($this->envAllowXdebug.'='.implode('|', $envArgs));
}
/**
* Logs status messages
*/
private function notify(string $op, ?string $data = null): void
{
$this->statusWriter->report($op, $data);
}
/**
* Returns default, changed and command-line ini settings
*
* @param mixed[] $loadedConfig All current ini settings
* @param mixed[] $iniConfig Settings from user ini files
*
*/
private function mergeLoadedConfig(array $loadedConfig, array $iniConfig): string
{
$content = '';
foreach ($loadedConfig as $name => $value) {
// Value will either be null, string or array (HHVM only)
if (!is_string($value)
|| strpos($name, 'xdebug') === 0
|| $name === 'apc.mmap_file_mask') {
continue;
}
if (!isset($iniConfig[$name]) || $iniConfig[$name] !== $value) {
// Double-quote escape each value
$content .= $name.'="'.addcslashes($value, '\\"').'"'.PHP_EOL;
}
}
return $content;
}
/**
* Returns true if the script name can be used
*/
private function checkMainScript(): bool
{
if ($this->script !== null) {
// Allow an application to set -- for standard input
return file_exists($this->script) || '--' === $this->script;
}
if (file_exists($this->script = $_SERVER['argv'][0])) {
return true;
}
// Use a backtrace to resolve Phar and chdir issues.
$trace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
$main = end($trace);
if ($main !== false && isset($main['file'])) {
return file_exists($this->script = $main['file']);
}
return false;
}
/**
* Adds restart settings to the environment
*
* @param string[] $envArgs
*/
private function setEnvRestartSettings(array $envArgs): void
{
$settings = [
php_ini_loaded_file(),
$envArgs[2],
$envArgs[3],
$envArgs[4],
getenv($this->envOriginalInis),
self::$skipped,
];
Process::setEnv(self::RESTART_SETTINGS, implode('|', $settings));
}
/**
* Syncs settings and the environment if called with existing settings
*
* @phpstan-param restartData $settings
*/
private function syncSettings(array $settings): void
{
if (false === getenv($this->envOriginalInis)) {
// Called by another app, so make original inis available
Process::setEnv($this->envOriginalInis, implode(PATH_SEPARATOR, $settings['inis']));
}
self::$skipped = $settings['skipped'];
$this->notify(Status::INFO, 'Process called with existing restart settings');
}
/**
* Returns true if there are no known configuration issues
*/
private function checkConfiguration(?string &$info): bool
{
if (!function_exists('proc_open')) {
$info = 'proc_open function is disabled';
return false;
}
if (extension_loaded('uopz') && !((bool) ini_get('uopz.disable'))) {
// uopz works at opcode level and disables exit calls
if (function_exists('uopz_allow_exit')) {
@uopz_allow_exit(true);
} else {
$info = 'uopz extension is not compatible';
return false;
}
}
// Check UNC paths when using cmd.exe
if (defined('PHP_WINDOWS_VERSION_BUILD') && PHP_VERSION_ID < 70400) {
$workingDir = getcwd();
if ($workingDir === false) {
$info = 'unable to determine working directory';
return false;
}
if (0 === strpos($workingDir, '\\\\')) {
$info = 'cmd.exe does not support UNC paths: '.$workingDir;
return false;
}
}
return true;
}
/**
* Enables async signals and control interrupts in the restarted process
*
* Available on Unix PHP 7.1+ with the pcntl extension and Windows PHP 7.4+.
*/
private function tryEnableSignals(): void
{
if (function_exists('pcntl_async_signals') && function_exists('pcntl_signal')) {
pcntl_async_signals(true);
$message = 'Async signals enabled';
if (!self::$inRestart) {
// Restarting, so ignore SIGINT in parent
pcntl_signal(SIGINT, SIG_IGN);
} elseif (is_int(pcntl_signal_get_handler(SIGINT))) {
// Restarted, no handler set so force default action
pcntl_signal(SIGINT, SIG_DFL);
}
}
if (!self::$inRestart && function_exists('sapi_windows_set_ctrl_handler')) {
// Restarting, so set a handler to ignore CTRL events in the parent.
// This ensures that CTRL+C events will be available in the child
// process without having to enable them there, which is unreliable.
sapi_windows_set_ctrl_handler(function ($evt) {});
}
}
/**
* Sets static properties $xdebugActive, $xdebugVersion and $xdebugMode
*/
private static function setXdebugDetails(): void
{
if (self::$xdebugActive !== null) {
return;
}
self::$xdebugActive = false;
if (!extension_loaded('xdebug')) {
return;
}
$version = phpversion('xdebug');
self::$xdebugVersion = $version !== false ? $version : 'unknown';
if (version_compare(self::$xdebugVersion, '3.1', '>=')) {
$modes = xdebug_info('mode');
self::$xdebugMode = count($modes) === 0 ? 'off' : implode(',', $modes);
self::$xdebugActive = self::$xdebugMode !== 'off';
return;
}
// See if xdebug.mode is supported in this version
$iniMode = ini_get('xdebug.mode');
if ($iniMode === false) {
self::$xdebugActive = true;
return;
}
// Environment value wins but cannot be empty
$envMode = (string) getenv('XDEBUG_MODE');
if ($envMode !== '') {
self::$xdebugMode = $envMode;
} else {
self::$xdebugMode = $iniMode !== '' ? $iniMode : 'off';
}
// An empty comma-separated list is treated as mode 'off'
if (Preg::isMatch('/^,+$/', str_replace(' ', '', self::$xdebugMode))) {
self::$xdebugMode = 'off';
}
self::$xdebugActive = self::$xdebugMode !== 'off';
}
}