a problem about openssl lib:SSL_connect()

["berg" <zealberg () 163 com>]

Hello, everyone

    I met a problem while using the function SSL_connect(), it always returns -1, and output some chaotic characters to 
the console(It seems that memory overflow). And I did not capture the ssl handshake packets. Does anyone knows the 
reason, and how to use it?

    Thanks for any advise.

    My codes as follow:
............
        int sd;
        int ret;
        SSL *ssl;
        SSL_CTX *ctx;

        // initial ssl library
        SSL_library_init();
        SSL_load_error_strings();

        // create ssl context
        ctx = SSL_CTX_new(SSLv23_client_method());

        if (ctx == NULL)
        {
                return -1;
        }

        SSL_CTX_set_verify(ctx, SSL_VERIFY_NONE, NULL);

        // create ssl
        ssl = SSL_new(ctx);
        if (ssl == NULL)
        {
                return -1;
        }

        // the function below returns a normal tcp connection socket description
        sd = create_https_socket(dip, dport);  
        if (sd <= 0)
        {
                return -1;
        }

        ret = SSL_set_fd(ssl, sd);
        if (ret == 0)
        {
                close(sd);
                return -1;
        }

        RAND_poll();
        while (RAND_status() == 0)
        {
                unsigned short rand_ret = rand() % 65536;
                RAND_seed(&rand_ret, sizeof(rand_ret));
        }

        // error occur
        ret = SSL_connect(ssl);
        printf("ret=%d\n", ret);    // the value of ret is -1
        if( ret != 1 )
        {
                close(sd);
                return -1;
        }


...........

Best Regards
Berg