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<?php /** * fsockopen HTTP transport * * @package Requests\Transport / namespace WpOrg\Requests\Transport; use WpOrg\Requests\Capability; use WpOrg\Requests\Exception; use WpOrg\Requests\Exception\InvalidArgument; use WpOrg\Requests\Port; use WpOrg\Requests\Requests; use WpOrg\Requests\Ssl; use WpOrg\Requests\Transport; use WpOrg\Requests\Utility\CaseInsensitiveDictionary; use WpOrg\Requests\Utility\InputValidator; /* * fsockopen HTTP transport * * @package Requests\Transport / final class Fsockopen implements Transport { /* * Second to microsecond conversion * * @var integer / const SECOND_IN_MICROSECONDS = 1000000; /* * Raw HTTP data * * @var string / public $headers = ''; /* * Stream metadata * * @var array Associative array of properties, see {@link https://www.php.net/stream_get_meta_data} / public $info; /* * What's the maximum number of bytes we should keep? * * @var int\|bool Byte count, or false if no limit. / private $max_bytes = false; /* * Cache for received connection errors. * * @var string / private $connect_error = ''; /* * Perform a request * * @param string\|Stringable $url URL to request * @param array $headers Associative array of request headers * @param string\|array $data Data to send either as the POST body, or as parameters in the URL for a GET/HEAD * @param array $options Request options, see {@see \WpOrg\Requests\Requests::response()} for documentation * @return string Raw HTTP result * * @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $url argument is not a string or Stringable. * @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $headers argument is not an array. * @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $data parameter is not an array or string. * @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $options argument is not an array. * @throws \WpOrg\Requests\Exception On failure to connect to socket (`fsockopenerror`) * @throws \WpOrg\Requests\Exception On socket timeout (`timeout`) / public function request($url, $headers = [], $data = [], $options = []) { if (InputValidator::is_string_or_stringable($url) === false) { throw InvalidArgument::create(1, '$url', 'string\|Stringable', gettype($url)); } if (is_array($headers) === false) { throw InvalidArgument::create(2, '$headers', 'array', gettype($headers)); } if (!is_array($data) && !is_string($data)) { if ($data === null) { $data = ''; } else { throw InvalidArgument::create(3, '$data', 'array\|string', gettype($data)); } } if (is_array($options) === false) { throw InvalidArgument::create(4, '$options', 'array', gettype($options)); } $options['hooks']->dispatch('fsockopen.before_request'); $url_parts = parse_url($url); if (empty($url_parts)) { throw new Exception('Invalid URL.', 'invalidurl', $url); } $host = $url_parts['host']; $context = stream_context_create(); $verifyname = false; $case_insensitive_headers = new CaseInsensitiveDictionary($headers); // HTTPS support if (isset($url_parts['scheme']) && strtolower($url_parts['scheme']) === 'https') { $remote_socket = 'ssl://' . $host; if (!isset($url_parts['port'])) { $url_parts['port'] = Port::HTTPS; } $context_options = [ 'verify_peer' => true, 'capture_peer_cert' => true, ]; $verifyname = true; // SNI, if enabled (OpenSSL >=0.9.8j) // phpcs:ignore PHPCompatibility.Constants.NewConstants.openssl_tlsext_server_nameFound if (defined('OPENSSL_TLSEXT_SERVER_NAME') && OPENSSL_TLSEXT_SERVER_NAME) { $context_options['SNI_enabled'] = true; if (isset($options['verifyname']) && $options['verifyname'] === false) { $context_options['SNI_enabled'] = false; } } if (isset($options['verify'])) { if ($options['verify'] === false) { $context_options['verify_peer'] = false; $context_options['verify_peer_name'] = false; $verifyname = false; } elseif (is_string($options['verify'])) { $context_options['cafile'] = $options['verify']; } } if (isset($options['verifyname']) && $options['verifyname'] === false) { $context_options['verify_peer_name'] = false; $verifyname = false; } // Handle the PHP 8.4 deprecation (PHP 9.0 removal) of the function signature we use for stream_context_set_option(). // Ref: https://wiki.php.net/rfc/deprecate_functions_with_overloaded_signatures#stream_context_set_option if (function_exists('stream_context_set_options')) { // PHP 8.3+. stream_context_set_options($context, ['ssl' => $context_options]); } else { // PHP < 8.3. stream_context_set_option($context, ['ssl' => $context_options]); } } else { $remote_socket = 'tcp://' . $host; } $this->max_bytes = $options['max_bytes']; if (!isset($url_parts['port'])) { $url_parts['port'] = Port::HTTP; } $remote_socket .= ':' . $url_parts['port']; // phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_set_error_handler set_error_handler([$this, 'connect_error_handler'], E_WARNING \| E_NOTICE); $options['hooks']->dispatch('fsockopen.remote_socket', [&$remote_socket]); $socket = stream_socket_client($remote_socket, $errno, $errstr, ceil($options['connect_timeout']), STREAM_CLIENT_CONNECT, $context); restore_error_handler(); if ($verifyname && !$this->verify_certificate_from_context($host, $context)) { throw new Exception('SSL certificate did not match the requested domain name', 'ssl.no_match'); } if (!$socket) { if ($errno === 0) { // Connection issue throw new Exception(rtrim($this->connect_error), 'fsockopen.connect_error'); } throw new Exception($errstr, 'fsockopenerror', null, $errno); } $data_format = $options['data_format']; if ($data_format === 'query') { $path = self::format_get($url_parts, $data); $data = ''; } else { $path = self::format_get($url_parts, []); } $options['hooks']->dispatch('fsockopen.remote_host_path', [&$path, $url]); $request_body = ''; $out = sprintf("%s %s HTTP/%.1F\r\n", $options['type'], $path, $options['protocol_version']); if ($options['type'] !== Requests::TRACE) { if (is_array($data)) { $request_body = http_build_query($data, '', '&'); } else { $request_body = $data; } // Always include Content-length on POST requests to prevent // 411 errors from some servers when the body is empty. if (!empty($data) \|\| $options['type'] === Requests::POST) { if (!isset($case_insensitive_headers['Content-Length'])) { $headers['Content-Length'] = strlen($request_body); } if (!isset($case_insensitive_headers['Content-Type'])) { $headers['Content-Type'] = 'application/x-www-form-urlencoded; charset=UTF-8'; } } } if (!isset($case_insensitive_headers['Host'])) { $out .= sprintf('Host: %s', $url_parts['host']); $scheme_lower = strtolower($url_parts['scheme']); if (($scheme_lower === 'http' && $url_parts['port'] !== Port::HTTP) \|\| ($scheme_lower === 'https' && $url_parts['port'] !== Port::HTTPS)) { $out .= ':' . $url_parts['port']; } $out .= "\r\n"; } if (!isset($case_insensitive_headers['User-Agent'])) { $out .= sprintf("User-Agent: %s\r\n", $options['useragent']); } $accept_encoding = $this->accept_encoding(); if (!isset($case_insensitive_headers['Accept-Encoding']) && !empty($accept_encoding)) { $out .= sprintf("Accept-Encoding: %s\r\n", $accept_encoding); } $headers = Requests::flatten($headers); if (!empty($headers)) { $out .= implode("\r\n", $headers) . "\r\n"; } $options['hooks']->dispatch('fsockopen.after_headers', [&$out]); if (substr($out, -2) !== "\r\n") { $out .= "\r\n"; } if (!isset($case_insensitive_headers['Connection'])) { $out .= "Connection: Close\r\n"; } $out .= "\r\n" . $request_body; $options['hooks']->dispatch('fsockopen.before_send', [&$out]); fwrite($socket, $out); $options['hooks']->dispatch('fsockopen.after_send', [$out]); if (!$options['blocking']) { fclose($socket); $fake_headers = ''; $options['hooks']->dispatch('fsockopen.after_request', [&$fake_headers]); return ''; } $timeout_sec = (int) floor($options['timeout']); if ($timeout_sec === $options['timeout']) { $timeout_msec = 0; } else { $timeout_msec = self::SECOND_IN_MICROSECONDS $options['timeout'] % self::SECOND_IN_MICROSECONDS; } stream_set_timeout($socket, $timeout_sec, $timeout_msec); $response = ''; $body = ''; $headers = ''; $this->info = stream_get_meta_data($socket); $size = 0; $doingbody = false; $download = false; if ($options['filename']) { // phpcs:ignore WordPress.PHP.NoSilencedErrors -- Silenced the PHP native warning in favour of throwing an exception. $download = @fopen($options['filename'], 'wb'); if ($download === false) { $error = error_get_last(); throw new Exception($error['message'], 'fopen'); } } while (!feof($socket)) { $this->info = stream_get_meta_data($socket); if ($this->info['timed_out']) { throw new Exception('fsocket timed out', 'timeout'); } $block = fread($socket, Requests::BUFFER_SIZE); if (!$doingbody) { $response .= $block; if (strpos($response, "\r\n\r\n")) { list($headers, $block) = explode("\r\n\r\n", $response, 2); $doingbody = true; } } // Are we in body mode now? if ($doingbody) { $options['hooks']->dispatch('request.progress', [$block, $size, $this->max_bytes]); $data_length = strlen($block); if ($this->max_bytes) { // Have we already hit a limit? if ($size === $this->max_bytes) { continue; } if (($size + $data_length) > $this->max_bytes) { // Limit the length $limited_length = ($this->max_bytes - $size); $block = substr($block, 0, $limited_length); } } $size += strlen($block); if ($download) { fwrite($download, $block); } else { $body .= $block; } } } $this->headers = $headers; if ($download) { fclose($download); } else { $this->headers .= "\r\n\r\n" . $body; } fclose($socket); $options['hooks']->dispatch('fsockopen.after_request', [&$this->headers, &$this->info]); return $this->headers; } /** * Send multiple requests simultaneously * * @param array $requests Request data (array of 'url', 'headers', 'data', 'options') as per {@see \WpOrg\Requests\Transport::request()} * @param array $options Global options, see {@see \WpOrg\Requests\Requests::response()} for documentation * @return array Array of \WpOrg\Requests\Response objects (may contain \WpOrg\Requests\Exception or string responses as well) * * @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $requests argument is not an array or iterable object with array access. * @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $options argument is not an array. / public function request_multiple($requests, $options) { // If you're not requesting, we can't get any responses ¯\_(ツ)_/¯ if (empty($requests)) { return []; } if (InputValidator::has_array_access($requests) === false \|\| InputValidator::is_iterable($requests) === false) { throw InvalidArgument::create(1, '$requests', 'array\|ArrayAccess&Traversable', gettype($requests)); } if (is_array($options) === false) { throw InvalidArgument::create(2, '$options', 'array', gettype($options)); } $responses = []; $class = get_class($this); foreach ($requests as $id => $request) { try { $handler = new $class(); $responses[$id] = $handler->request($request['url'], $request['headers'], $request['data'], $request['options']); $request['options']['hooks']->dispatch('transport.internal.parse_response', [&$responses[$id], $request]); } catch (Exception $e) { $responses[$id] = $e; } if (!is_string($responses[$id])) { $request['options']['hooks']->dispatch('multiple.request.complete', [&$responses[$id], $id]); } } return $responses; } /* * Retrieve the encodings we can accept * * @return string Accept-Encoding header value / private static function accept_encoding() { $type = []; if (function_exists('gzinflate')) { $type[] = 'deflate;q=1.0'; } if (function_exists('gzuncompress')) { $type[] = 'compress;q=0.5'; } $type[] = 'gzip;q=0.5'; return implode(', ', $type); } /* * Format a URL given GET data * * @param array $url_parts Array of URL parts as received from {@link https://www.php.net/parse_url} * @param array\|object $data Data to build query using, see {@link https://www.php.net/http_build_query} * @return string URL with data / private static function format_get($url_parts, $data) { if (!empty($data)) { if (empty($url_parts['query'])) { $url_parts['query'] = ''; } $url_parts['query'] .= '&' . http_build_query($data, '', '&'); $url_parts['query'] = trim($url_parts['query'], '&'); } if (isset($url_parts['path'])) { if (isset($url_parts['query'])) { $get = $url_parts['path'] . '?' . $url_parts['query']; } else { $get = $url_parts['path']; } } else { $get = '/'; } return $get; } /* * Error handler for stream_socket_client() * * @param int $errno Error number (e.g. E_WARNING) * @param string $errstr Error message / public function connect_error_handler($errno, $errstr) { // Double-check we can handle it if (($errno & E_WARNING) === 0 && ($errno & E_NOTICE) === 0) { // Return false to indicate the default error handler should engage return false; } $this->connect_error .= $errstr . "\n"; return true; } /* * Verify the certificate against common name and subject alternative names * * Unfortunately, PHP doesn't check the certificate against the alternative * names, leading things like 'https://www.github.com/' to be invalid. * Instead * * @link https://tools.ietf.org/html/rfc2818#section-3.1 RFC2818, Section 3.1 * * @param string $host Host name to verify against * @param resource $context Stream context * @return bool * * @throws \WpOrg\Requests\Exception On failure to connect via TLS (`fsockopen.ssl.connect_error`) * @throws \WpOrg\Requests\Exception On not obtaining a match for the host (`fsockopen.ssl.no_match`) / public function verify_certificate_from_context($host, $context) { $meta = stream_context_get_options($context); // If we don't have SSL options, then we couldn't make the connection at // all if (empty($meta) \|\| empty($meta['ssl']) \|\| empty($meta['ssl']['peer_certificate'])) { throw new Exception(rtrim($this->connect_error), 'ssl.connect_error'); } $cert = openssl_x509_parse($meta['ssl']['peer_certificate']); return Ssl::verify_certificate($host, $cert); } /* * Self-test whether the transport can be used. * * The available capabilities to test for can be found in {@see \WpOrg\Requests\Capability}. * * @codeCoverageIgnore * @param array<string, bool> $capabilities Optional. Associative array of capabilities to test against, i.e. `['<capability>' => true]`. * @return bool Whether the transport can be used. */ public static function test($capabilities = []) { if (!function_exists('fsockopen')) { return false; } // If needed, check that streams support SSL if (isset($capabilities[Capability::SSL]) && $capabilities[Capability::SSL]) { if (!extension_loaded('openssl') \|\| !function_exists('openssl_x509_parse')) { return false; } } return true; } }

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