OpenSSL SSL_read malfunction
<p>I'm trying to write a c++ application connecting to a server with OpenSSL.
I can send data, that arrives undamaged to the server, but the read operation reads just 1 byte. </p>

<p>The code :</p>

<pre><code>char*           dest_url = "147.87.116.74";
X509                *cert = NULL;
X509_name_st    *certname = NULL;
const SSL_METHOD *method;
SSL_CTX *ctx;
SSL *ssl;
int server = 0;
int ret, i;

/* ---------------------------------------------------------- *
* These function calls initialize openssl for correct work.  *
* ---------------------------------------------------------- */
OpenSSL_add_all_algorithms();
ERR_load_BIO_strings();
ERR_load_crypto_strings();
SSL_load_error_strings();

/* ---------------------------------------------------------- *
* initialize SSL library and register algorithms             *
* ---------------------------------------------------------- */
SSL_library_init();

/* ---------------------------------------------------------- *
* Set SSLv2 client hello, also announce SSLv3 and TLSv1      *
* ---------------------------------------------------------- */
method = TLSv1_2_client_method();

/* ---------------------------------------------------------- *
* Try to create a new SSL context                            *
* ---------------------------------------------------------- */
ctx = SSL_CTX_new(method);

/* ---------------------------------------------------------- *
* SSL certificate checking      AND MY STUFF    
* thanks guys http://h71000.www7.hp.com/doc/83final/ba554_90007/ch05s03.html
* ---------------------------------------------------------- */
SSL_CTX_load_verify_locations(ctx, "ca.crt", nullptr);
SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL);
SSL_CTX_set_verify_depth(ctx, 1);

/* ---------------------------------------------------------- *
* Create new SSL connection state object                     *
* ---------------------------------------------------------- */
ssl = SSL_new(ctx);

/* ---------------------------------------------------------- *
* Make the underlying TCP socket connection                  *
* ---------------------------------------------------------- */
server = create_socket(dest_url);

/* ---------------------------------------------------------- *
* Attach the SSL session to the socket descriptor            *
* ---------------------------------------------------------- */
SSL_set_fd(ssl, server);

/* ---------------------------------------------------------- *
* Try to SSL-connect here, returns 1 for success             *
* ---------------------------------------------------------- */
SSL_connect(ssl);

/* ---------------------------------------------------------- *
* send some text                                              *
* -----------------------------------------------------------*/
char* tSend = "testdata";
int sendSize = strlen(tSend);
int net_tSend = htonl(sendSize);

SSL_write(ssl, &amp;net_tSend, 4);
SSL_write(ssl, tSend, sendSize);

long size = 0L;
int bytesread = SSL_read(ssl, &amp;size, 4);
</code></pre>

<p>My questions :
Is is imperative to use a BIO object ?
Why is the read() function reading just 1 byte ?
How can i retrieve/read errors ?</p>