Re: memory growing when using SSL connections

[David]

Jeremy,
 I'm not sure if I've tried the EVP_cleanup() routine. I'll give it a shot.

Thanks,
David

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From: "Jeremy Hunt" <jere...@optimation.com.au>
Sent: Thursday, January 07, 2010 5:34 PM
To: <openssl-users@openssl.org>; <danny33...@bellsouth.net>
Subject: Re: memory growing when using SSL connections

Hi David,

After reading this [http://www.nlnetlabs.nl/downloads/publications/hsm/hsm_node21.html] , it occurs to me that you might need EVP_cleanup() too. You might consider his clean_up() routine in general, or at least consider his comments on it.

I think it is true to say that for every function in openSSL that sets up structures etc there is a corresponding free function.

Regards,

Jeremy

David wrote:

*[safeTgram (safetgram-in) receive status: NOT encrypted, NOT signed.]*

Hi,

I'm using tn3270 sessions running over SSL. I may have up to 124 sessions activated concurrently, although I plan to get up to 250 sessions at some point. Whenever the sessions are stopped and restarted, I notice intermittently that memory grows in multiples of 4K bytes. I'm running on AIX 5.1, 5.2 and 5.3 and using openssl-0.9.8l. There doesn't appear to be an obvious memory leak in either my application or the OpenSSL stuff (all memory allocated when the sessions are started are freed when the sessions are stopped).

Here's a summary of the code structure:
 SSL_library_init();
meth = TLSv1_client_method();
RAND_seed();
ctx = SSL_CTX_new(meth);
 while ([some telnet connection wants to do SSL])
{
    ssl = SSL_new(ctx);
    SSL_set_fd()
    SSL_set_cipher_list();   SSL_set_connect_state();
    SSL_connect();
    do SSL_read(), SSL_write()
    SSL_shutdown();
    close FD;
    SSL_free();
    CRYPTO_cleanup_all_ex_data();
  }
         Any ideas would be appreciated.
Thanks,
David

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