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POIn PHP: OpenSSL Error messages: error: 1409F07F: SSL routines: SSL3_WRITE_PENDING: bad write retry
 

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  1. POIn PHP: OpenSSL Error messages: error: 1409F07F: SSL routines: SSL3_WRITE_PENDING: bad write retry
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    <p>I'm trying to send a huge amount of data using SSL/TLS connection in PHP. It works pretty well if the data chunk isn't very big or if I don't use TLS, but what I need (near 2MiB), the <code>fwrite</code> function shows the warning:</p> <blockquote> <p>Warning: fwrite(): SSL operation failed with code 1. OpenSSL Error messages: error: 1409F07F: SSL routines: SSL3_WRITE_PENDING: bad write retry</p> </blockquote> <p>The relevant code I'm using to connect clients:</p> <pre><code>$cntxt = stream_context_create(array('ssl' =&gt; array('local_cert' =&gt; 'certificate.pem'))); $server = stream_socket_server('tls://127.0.0.1:8080', $errno, $errstr, STREAM_SERVER_BIND|STREAM_SERVER_LISTEN, $cntxt); // Wait for client connection // $client = stream_socket_accept($server); // Use non-blocking socket to allow answering many clients at a time stream_set_blocking($client, 0); $clients[] = $client; </code></pre> <p>When sending data, it's append to a buffer and, from time to time, this function is called for each client and linked buffer:</p> <pre><code>function trySend($client, &amp;$buffer) { if (strlen($buffer)) { $len = fwrite($client, $buffer); $buffer = substr($buffer, $len); } } </code></pre> <p>As I said, my code works for small ammount of data or for normal (non-TLS) connections. I've searched for this error and found <a href="http://www.openssl.org/docs/ssl/SSL_write.html" rel="nofollow">http://www.openssl.org/docs/ssl/SSL_write.html</a>:</p> <blockquote> <p>SSL_write() will only return with success, when the complete contents of buf of length num has been written. This default behaviour can be changed with the SSL_MODE_ENABLE_PARTIAL_WRITE option of SSL_CTX_set_mode(3). When this flag is set, SSL_write() will also return with success, when a partial write has been successfully completed. In this case the SSL_write() operation is considered completed. The bytes are sent and a new SSL_write() operation with a new buffer (with the already sent bytes removed) must be started. A partial write is performed with the size of a message block, which is 16kB for SSLv3/TLSv1.</p> </blockquote> <p>But how can I do this in PHP?</p> <p>Any help appreciated :)</p>
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