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<?php |
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/** |
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* XML-RPC server acting as proxy for requests to other servers |
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* (useful e.g. for js-originated calls that can only connect back to the originating server because of the same-domain policy). |
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* NB: this is an OPEN RELAY. It is meant as a demo, not to be used in production! |
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* |
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* For an example of a transparent reverse-proxy, see the ReverseProxy class in package phpxmlrpc/extras. |
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* |
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* The source code demonstrates: |
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* - usage of the PhpXmlRpc\Encoder class to convert between php values and xml-rpc Value objects |
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* - setting of options related to the http transport to a Client |
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* - usage of multiple signatures for one xml-rpc method |
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* |
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* @author Gaetano Giunta |
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* @copyright (C) 2006-2025 G. Giunta |
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* @license code licensed under the BSD License: see file license.txt |
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*/ |
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require_once __DIR__ . "/_prepend.php"; |
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// *** NB: WE BLOCK THIS FROM RUNNING BY DEFAULT IN CASE ACCESS IS GRANTED TO IT IN PRODUCTION BY MISTAKE *** |
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// Comment out the following safeguard if you want to use it as is, but remember: this is an open relay !!! |
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// Open relays can easily be abused as trojan horses, allowing access to your private network. |
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if (!defined('TESTMODE')) { |
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die("Server disabled by default for safety"); |
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} |
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use PhpXmlRpc\Client; |
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use PhpXmlRpc\Encoder; |
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use PhpXmlRpc\Request; |
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use PhpXmlRpc\Server; |
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/** |
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* Forward an xml-rpc request to another server, and return to client the response received. |
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* |
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* @param PhpXmlRpc\Request $req (see method docs below for a description of the expected parameters) |
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* @return PhpXmlRpc\Response |
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*/ |
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function forward_request($req) |
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{ |
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$encoder = new Encoder(); |
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// create client |
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$timeout = 0; |
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$url = $req->getParam(0)->scalarVal(); |
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// *** NB *** here we should validate the received url, using f.e. a whitelist of approved servers _and protocols_... |
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// fe. any url using the 'file://' protocol might be considered a hacking attempt |
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$client = new Client($url); |
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if ($req->getNumParams() > 3) { |
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// We have to set some options onto the client. |
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// Note that if we do not untaint the received values, warnings might be generated... |
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$options = $encoder->decode($req->getParam(3)); |
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foreach ($options as $key => $val) { |
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switch ($key) { |
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case 'authType': |
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/// @todo add support for this if needed |
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break; |
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case 'followRedirects': |
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// requires cURL to be enabled |
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if ($val) { |
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$client->setOption(Client::OPT_USE_CURL, Client::USE_CURL_ALWAYS); |
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$client->setOption(Client::OPT_EXTRA_CURL_OPTS, array(CURLOPT_FOLLOWLOCATION => true, CURLOPT_POSTREDIR => 3)); |
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} |
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case 'Cookies': |
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/// @todo add support for this if needed |
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break; |
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case 'Credentials': |
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/// @todo add support for this as well if needed |
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break; |
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case 'HTTPProxy': |
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case 'HTTPProxyCredentials': |
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/// @todo add support for this as well if needed |
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break; |
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case 'RequestCharsetEncoding': |
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// allow the server to work as charset transcoder. |
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// NB: works best with mbstring enabled |
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$client->setOption(Client::OPT_REQUEST_CHARSET_ENCODING, $val); |
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break; |
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1 |
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case 'RequestCompression': |
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$client->setOption(Client::OPT_REQUEST_COMPRESSION, $val); |
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break; |
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1 |
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case 'SSLVerifyHost': |
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$client->setOption(Client::OPT_VERIFY_HOST, $val); |
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break; |
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case 'SSLVerifyPeer': |
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$client->setOption(Client::OPT_VERIFY_PEER, $val); |
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break; |
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case 'Timeout': |
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$timeout = (integer)$val; |
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break; |
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} // switch |
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1 |
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} |
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} |
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// build call for remote server |
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/// @todo find a way to forward client info (such as IP) to the upstream server, either |
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/// - as xml comments in the payload, or |
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/// - using std http header conventions, such as X-forwarded-for (but public servers should strip |
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/// X-forwarded-for anyway, unless they consider this server as trusted...) |
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$reqMethod = $req->getParam(1)->scalarVal(); |
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$req = new Request($reqMethod); |
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if ($req->getNumParams() > 1) { |
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$pars = $req->getParam(2); |
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foreach ($pars as $par) { |
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$req->addParam($par); |
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} |
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} |
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// add debug info into response we give back to caller |
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Server::xmlrpc_debugmsg("Sending to server $url the payload: " . $req->serialize()); |
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return $client->send($req, $timeout); |
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} |
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// Given that the target server is left to be picked by the caller, it might support the '<NIL/>' xml-rpc extension |
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PhpXmlRpc\PhpXmlRpc::$xmlrpc_null_extension = true; |
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// Run the server |
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// NB: take care not to output anything else after this call, as it will mess up the responses and it will be hard to |
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// debug. In case you have to do so, at least re-emit a correct Content-Length http header (requires output buffering) |
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$server = new Server( |
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array( |
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'xmlrpcproxy.call' => array( |
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'function' => 'forward_request', |
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'signature' => array( |
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array('mixed', 'string', 'string'), |
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array('mixed', 'string', 'string', 'array'), |
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array('mixed', 'string', 'string', 'array', 'struct'), |
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), |
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'docstring' => 'forwards xml-rpc calls to remote servers. Returns remote method\'s response. Accepts params: remote server url (might include basic auth credentials), method name, array of params (optional), and a struct containing call options (optional)', |
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), |
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) |
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); |
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gggeek /
phpxmlrpc
