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   1  <?php
   2  /**
   3   * fsockopen HTTP transport
   4   *
   5   * @package Requests\Transport
   6   */
   7  
   8  namespace WpOrg\Requests\Transport;
   9  
  10  use WpOrg\Requests\Capability;
  11  use WpOrg\Requests\Exception;
  12  use WpOrg\Requests\Exception\InvalidArgument;
  13  use WpOrg\Requests\Port;
  14  use WpOrg\Requests\Requests;
  15  use WpOrg\Requests\Ssl;
  16  use WpOrg\Requests\Transport;
  17  use WpOrg\Requests\Utility\CaseInsensitiveDictionary;
  18  use WpOrg\Requests\Utility\InputValidator;
  19  
  20  /**
  21   * fsockopen HTTP transport
  22   *
  23   * @package Requests\Transport
  24   */
  25  final class Fsockopen implements Transport {
  26      /**
  27       * Second to microsecond conversion
  28       *
  29       * @var integer
  30       */
  31      const SECOND_IN_MICROSECONDS = 1000000;
  32  
  33      /**
  34       * Raw HTTP data
  35       *
  36       * @var string
  37       */
  38      public $headers = '';
  39  
  40      /**
  41       * Stream metadata
  42       *
  43       * @var array Associative array of properties, see {@link https://www.php.net/stream_get_meta_data}
  44       */
  45      public $info;
  46  
  47      /**
  48       * What's the maximum number of bytes we should keep?
  49       *
  50       * @var int|bool Byte count, or false if no limit.
  51       */
  52      private $max_bytes = false;
  53  
  54      private $connect_error = '';
  55  
  56      /**
  57       * Perform a request
  58       *
  59       * @param string|Stringable $url URL to request
  60       * @param array $headers Associative array of request headers
  61       * @param string|array $data Data to send either as the POST body, or as parameters in the URL for a GET/HEAD
  62       * @param array $options Request options, see {@see \WpOrg\Requests\Requests::response()} for documentation
  63       * @return string Raw HTTP result
  64       *
  65       * @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $url argument is not a string or Stringable.
  66       * @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $headers argument is not an array.
  67       * @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $data parameter is not an array or string.
  68       * @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $options argument is not an array.
  69       * @throws \WpOrg\Requests\Exception       On failure to connect to socket (`fsockopenerror`)
  70       * @throws \WpOrg\Requests\Exception       On socket timeout (`timeout`)
  71       */
  72  	public function request($url, $headers = [], $data = [], $options = []) {
  73          if (InputValidator::is_string_or_stringable($url) === false) {
  74              throw InvalidArgument::create(1, '$url', 'string|Stringable', gettype($url));
  75          }
  76  
  77          if (is_array($headers) === false) {
  78              throw InvalidArgument::create(2, '$headers', 'array', gettype($headers));
  79          }
  80  
  81          if (!is_array($data) && !is_string($data)) {
  82              if ($data === null) {
  83                  $data = '';
  84              } else {
  85                  throw InvalidArgument::create(3, '$data', 'array|string', gettype($data));
  86              }
  87          }
  88  
  89          if (is_array($options) === false) {
  90              throw InvalidArgument::create(4, '$options', 'array', gettype($options));
  91          }
  92  
  93          $options['hooks']->dispatch('fsockopen.before_request');
  94  
  95          $url_parts = parse_url($url);
  96          if (empty($url_parts)) {
  97              throw new Exception('Invalid URL.', 'invalidurl', $url);
  98          }
  99          $host                     = $url_parts['host'];
 100          $context                  = stream_context_create();
 101          $verifyname               = false;
 102          $case_insensitive_headers = new CaseInsensitiveDictionary($headers);
 103  
 104          // HTTPS support
 105          if (isset($url_parts['scheme']) && strtolower($url_parts['scheme']) === 'https') {
 106              $remote_socket = 'ssl://' . $host;
 107              if (!isset($url_parts['port'])) {
 108                  $url_parts['port'] = Port::HTTPS;
 109              }
 110  
 111              $context_options = [
 112                  'verify_peer'       => true,
 113                  'capture_peer_cert' => true,
 114              ];
 115              $verifyname      = true;
 116  
 117              // SNI, if enabled (OpenSSL >=0.9.8j)
 118              // phpcs:ignore PHPCompatibility.Constants.NewConstants.openssl_tlsext_server_nameFound
 119              if (defined('OPENSSL_TLSEXT_SERVER_NAME') && OPENSSL_TLSEXT_SERVER_NAME) {
 120                  $context_options['SNI_enabled'] = true;
 121                  if (isset($options['verifyname']) && $options['verifyname'] === false) {
 122                      $context_options['SNI_enabled'] = false;
 123                  }
 124              }
 125  
 126              if (isset($options['verify'])) {
 127                  if ($options['verify'] === false) {
 128                      $context_options['verify_peer']      = false;
 129                      $context_options['verify_peer_name'] = false;
 130                      $verifyname                          = false;
 131                  }
 132                  elseif (is_string($options['verify'])) {
 133                      $context_options['cafile'] = $options['verify'];
 134                  }
 135              }
 136  
 137              if (isset($options['verifyname']) && $options['verifyname'] === false) {
 138                  $context_options['verify_peer_name'] = false;
 139                  $verifyname                          = false;
 140              }
 141  
 142              stream_context_set_option($context, ['ssl' => $context_options]);
 143          }
 144          else {
 145              $remote_socket = 'tcp://' . $host;
 146          }
 147  
 148          $this->max_bytes = $options['max_bytes'];
 149  
 150          if (!isset($url_parts['port'])) {
 151              $url_parts['port'] = Port::HTTP;
 152          }
 153          $remote_socket .= ':' . $url_parts['port'];
 154  
 155          // phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_set_error_handler
 156          set_error_handler([$this, 'connect_error_handler'], E_WARNING | E_NOTICE);
 157  
 158          $options['hooks']->dispatch('fsockopen.remote_socket', [&$remote_socket]);
 159  
 160          $socket = stream_socket_client($remote_socket, $errno, $errstr, ceil($options['connect_timeout']), STREAM_CLIENT_CONNECT, $context);
 161  
 162          restore_error_handler();
 163  
 164          if ($verifyname && !$this->verify_certificate_from_context($host, $context)) {
 165              throw new Exception('SSL certificate did not match the requested domain name', 'ssl.no_match');
 166          }
 167  
 168          if (!$socket) {
 169              if ($errno === 0) {
 170                  // Connection issue
 171                  throw new Exception(rtrim($this->connect_error), 'fsockopen.connect_error');
 172              }
 173  
 174              throw new Exception($errstr, 'fsockopenerror', null, $errno);
 175          }
 176  
 177          $data_format = $options['data_format'];
 178  
 179          if ($data_format === 'query') {
 180              $path = self::format_get($url_parts, $data);
 181              $data = '';
 182          }
 183          else {
 184              $path = self::format_get($url_parts, []);
 185          }
 186  
 187          $options['hooks']->dispatch('fsockopen.remote_host_path', [&$path, $url]);
 188  
 189          $request_body = '';
 190          $out          = sprintf("%s %s HTTP/%.1F\r\n", $options['type'], $path, $options['protocol_version']);
 191  
 192          if ($options['type'] !== Requests::TRACE) {
 193              if (is_array($data)) {
 194                  $request_body = http_build_query($data, '', '&');
 195              }
 196              else {
 197                  $request_body = $data;
 198              }
 199  
 200              // Always include Content-length on POST requests to prevent
 201              // 411 errors from some servers when the body is empty.
 202              if (!empty($data) || $options['type'] === Requests::POST) {
 203                  if (!isset($case_insensitive_headers['Content-Length'])) {
 204                      $headers['Content-Length'] = strlen($request_body);
 205                  }
 206  
 207                  if (!isset($case_insensitive_headers['Content-Type'])) {
 208                      $headers['Content-Type'] = 'application/x-www-form-urlencoded; charset=UTF-8';
 209                  }
 210              }
 211          }
 212  
 213          if (!isset($case_insensitive_headers['Host'])) {
 214              $out         .= sprintf('Host: %s', $url_parts['host']);
 215              $scheme_lower = strtolower($url_parts['scheme']);
 216  
 217              if (($scheme_lower === 'http' && $url_parts['port'] !== Port::HTTP) || ($scheme_lower === 'https' && $url_parts['port'] !== Port::HTTPS)) {
 218                  $out .= ':' . $url_parts['port'];
 219              }
 220              $out .= "\r\n";
 221          }
 222  
 223          if (!isset($case_insensitive_headers['User-Agent'])) {
 224              $out .= sprintf("User-Agent: %s\r\n", $options['useragent']);
 225          }
 226  
 227          $accept_encoding = $this->accept_encoding();
 228          if (!isset($case_insensitive_headers['Accept-Encoding']) && !empty($accept_encoding)) {
 229              $out .= sprintf("Accept-Encoding: %s\r\n", $accept_encoding);
 230          }
 231  
 232          $headers = Requests::flatten($headers);
 233  
 234          if (!empty($headers)) {
 235              $out .= implode("\r\n", $headers) . "\r\n";
 236          }
 237  
 238          $options['hooks']->dispatch('fsockopen.after_headers', [&$out]);
 239  
 240          if (substr($out, -2) !== "\r\n") {
 241              $out .= "\r\n";
 242          }
 243  
 244          if (!isset($case_insensitive_headers['Connection'])) {
 245              $out .= "Connection: Close\r\n";
 246          }
 247  
 248          $out .= "\r\n" . $request_body;
 249  
 250          $options['hooks']->dispatch('fsockopen.before_send', [&$out]);
 251  
 252          fwrite($socket, $out);
 253          $options['hooks']->dispatch('fsockopen.after_send', [$out]);
 254  
 255          if (!$options['blocking']) {
 256              fclose($socket);
 257              $fake_headers = '';
 258              $options['hooks']->dispatch('fsockopen.after_request', [&$fake_headers]);
 259              return '';
 260          }
 261  
 262          $timeout_sec = (int) floor($options['timeout']);
 263          if ($timeout_sec === $options['timeout']) {
 264              $timeout_msec = 0;
 265          }
 266          else {
 267              $timeout_msec = self::SECOND_IN_MICROSECONDS * $options['timeout'] % self::SECOND_IN_MICROSECONDS;
 268          }
 269          stream_set_timeout($socket, $timeout_sec, $timeout_msec);
 270  
 271          $response   = '';
 272          $body       = '';
 273          $headers    = '';
 274          $this->info = stream_get_meta_data($socket);
 275          $size       = 0;
 276          $doingbody  = false;
 277          $download   = false;
 278          if ($options['filename']) {
 279              // phpcs:ignore WordPress.PHP.NoSilencedErrors -- Silenced the PHP native warning in favour of throwing an exception.
 280              $download = @fopen($options['filename'], 'wb');
 281              if ($download === false) {
 282                  $error = error_get_last();
 283                  throw new Exception($error['message'], 'fopen');
 284              }
 285          }
 286  
 287          while (!feof($socket)) {
 288              $this->info = stream_get_meta_data($socket);
 289              if ($this->info['timed_out']) {
 290                  throw new Exception('fsocket timed out', 'timeout');
 291              }
 292  
 293              $block = fread($socket, Requests::BUFFER_SIZE);
 294              if (!$doingbody) {
 295                  $response .= $block;
 296                  if (strpos($response, "\r\n\r\n")) {
 297                      list($headers, $block) = explode("\r\n\r\n", $response, 2);
 298                      $doingbody             = true;
 299                  }
 300              }
 301  
 302              // Are we in body mode now?
 303              if ($doingbody) {
 304                  $options['hooks']->dispatch('request.progress', [$block, $size, $this->max_bytes]);
 305                  $data_length = strlen($block);
 306                  if ($this->max_bytes) {
 307                      // Have we already hit a limit?
 308                      if ($size === $this->max_bytes) {
 309                          continue;
 310                      }
 311                      if (($size + $data_length) > $this->max_bytes) {
 312                          // Limit the length
 313                          $limited_length = ($this->max_bytes - $size);
 314                          $block          = substr($block, 0, $limited_length);
 315                      }
 316                  }
 317  
 318                  $size += strlen($block);
 319                  if ($download) {
 320                      fwrite($download, $block);
 321                  }
 322                  else {
 323                      $body .= $block;
 324                  }
 325              }
 326          }
 327          $this->headers = $headers;
 328  
 329          if ($download) {
 330              fclose($download);
 331          }
 332          else {
 333              $this->headers .= "\r\n\r\n" . $body;
 334          }
 335          fclose($socket);
 336  
 337          $options['hooks']->dispatch('fsockopen.after_request', [&$this->headers, &$this->info]);
 338          return $this->headers;
 339      }
 340  
 341      /**
 342       * Send multiple requests simultaneously
 343       *
 344       * @param array $requests Request data (array of 'url', 'headers', 'data', 'options') as per {@see \WpOrg\Requests\Transport::request()}
 345       * @param array $options Global options, see {@see \WpOrg\Requests\Requests::response()} for documentation
 346       * @return array Array of \WpOrg\Requests\Response objects (may contain \WpOrg\Requests\Exception or string responses as well)
 347       *
 348       * @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $requests argument is not an array or iterable object with array access.
 349       * @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $options argument is not an array.
 350       */
 351  	public function request_multiple($requests, $options) {
 352          // If you're not requesting, we can't get any responses ¯\_(ツ)_/¯
 353          if (empty($requests)) {
 354              return [];
 355          }
 356  
 357          if (InputValidator::has_array_access($requests) === false || InputValidator::is_iterable($requests) === false) {
 358              throw InvalidArgument::create(1, '$requests', 'array|ArrayAccess&Traversable', gettype($requests));
 359          }
 360  
 361          if (is_array($options) === false) {
 362              throw InvalidArgument::create(2, '$options', 'array', gettype($options));
 363          }
 364  
 365          $responses = [];
 366          $class     = get_class($this);
 367          foreach ($requests as $id => $request) {
 368              try {
 369                  $handler        = new $class();
 370                  $responses[$id] = $handler->request($request['url'], $request['headers'], $request['data'], $request['options']);
 371  
 372                  $request['options']['hooks']->dispatch('transport.internal.parse_response', [&$responses[$id], $request]);
 373              }
 374              catch (Exception $e) {
 375                  $responses[$id] = $e;
 376              }
 377  
 378              if (!is_string($responses[$id])) {
 379                  $request['options']['hooks']->dispatch('multiple.request.complete', [&$responses[$id], $id]);
 380              }
 381          }
 382  
 383          return $responses;
 384      }
 385  
 386      /**
 387       * Retrieve the encodings we can accept
 388       *
 389       * @return string Accept-Encoding header value
 390       */
 391  	private static function accept_encoding() {
 392          $type = [];
 393          if (function_exists('gzinflate')) {
 394              $type[] = 'deflate;q=1.0';
 395          }
 396  
 397          if (function_exists('gzuncompress')) {
 398              $type[] = 'compress;q=0.5';
 399          }
 400  
 401          $type[] = 'gzip;q=0.5';
 402  
 403          return implode(', ', $type);
 404      }
 405  
 406      /**
 407       * Format a URL given GET data
 408       *
 409       * @param array $url_parts
 410       * @param array|object $data Data to build query using, see {@link https://www.php.net/http_build_query}
 411       * @return string URL with data
 412       */
 413  	private static function format_get($url_parts, $data) {
 414          if (!empty($data)) {
 415              if (empty($url_parts['query'])) {
 416                  $url_parts['query'] = '';
 417              }
 418  
 419              $url_parts['query'] .= '&' . http_build_query($data, '', '&');
 420              $url_parts['query']  = trim($url_parts['query'], '&');
 421          }
 422          if (isset($url_parts['path'])) {
 423              if (isset($url_parts['query'])) {
 424                  $get = $url_parts['path'] . '?' . $url_parts['query'];
 425              }
 426              else {
 427                  $get = $url_parts['path'];
 428              }
 429          }
 430          else {
 431              $get = '/';
 432          }
 433          return $get;
 434      }
 435  
 436      /**
 437       * Error handler for stream_socket_client()
 438       *
 439       * @param int $errno Error number (e.g. E_WARNING)
 440       * @param string $errstr Error message
 441       */
 442  	public function connect_error_handler($errno, $errstr) {
 443          // Double-check we can handle it
 444          if (($errno & E_WARNING) === 0 && ($errno & E_NOTICE) === 0) {
 445              // Return false to indicate the default error handler should engage
 446              return false;
 447          }
 448  
 449          $this->connect_error .= $errstr . "\n";
 450          return true;
 451      }
 452  
 453      /**
 454       * Verify the certificate against common name and subject alternative names
 455       *
 456       * Unfortunately, PHP doesn't check the certificate against the alternative
 457       * names, leading things like 'https://www.github.com/' to be invalid.
 458       * Instead
 459       *
 460       * @link https://tools.ietf.org/html/rfc2818#section-3.1 RFC2818, Section 3.1
 461       *
 462       * @param string $host Host name to verify against
 463       * @param resource $context Stream context
 464       * @return bool
 465       *
 466       * @throws \WpOrg\Requests\Exception On failure to connect via TLS (`fsockopen.ssl.connect_error`)
 467       * @throws \WpOrg\Requests\Exception On not obtaining a match for the host (`fsockopen.ssl.no_match`)
 468       */
 469  	public function verify_certificate_from_context($host, $context) {
 470          $meta = stream_context_get_options($context);
 471  
 472          // If we don't have SSL options, then we couldn't make the connection at
 473          // all
 474          if (empty($meta) || empty($meta['ssl']) || empty($meta['ssl']['peer_certificate'])) {
 475              throw new Exception(rtrim($this->connect_error), 'ssl.connect_error');
 476          }
 477  
 478          $cert = openssl_x509_parse($meta['ssl']['peer_certificate']);
 479  
 480          return Ssl::verify_certificate($host, $cert);
 481      }
 482  
 483      /**
 484       * Self-test whether the transport can be used.
 485       *
 486       * The available capabilities to test for can be found in {@see \WpOrg\Requests\Capability}.
 487       *
 488       * @codeCoverageIgnore
 489       * @param array<string, bool> $capabilities Optional. Associative array of capabilities to test against, i.e. `['<capability>' => true]`.
 490       * @return bool Whether the transport can be used.
 491       */
 492  	public static function test($capabilities = []) {
 493          if (!function_exists('fsockopen')) {
 494              return false;
 495          }
 496  
 497          // If needed, check that streams support SSL
 498          if (isset($capabilities[Capability::SSL]) && $capabilities[Capability::SSL]) {
 499              if (!extension_loaded('openssl') || !function_exists('openssl_x509_parse')) {
 500                  return false;
 501              }
 502          }
 503  
 504          return true;
 505      }
 506  }