[Help-gnutls] Restore gnutls session after execvp - possible?

[FlashCode]

Hi,

I'm developing an IRC client called WeeChat
(http://weechat.flashtux.org).
I'm adding a new feature: /upgrade command, which does an execvp() of
weechat, without closing connections to servers (sockets are still
open after execvp).

For some servers, user may connect thru gnutls (SSL), and I need to save
session in file when upgrading, then restore it when starting new
process.

Is it possible to do that with gnutls today?

I saw an example in the doc, but situation is not exactly the same,
socket is reopen after close, then gnutls session reloaded.
In my case, socket is not closed.


I tried something like that :


1. quit weechat without closing sockets, and do that for gnutls:

 - for each gnutls server:
 
    gnutls_session_get_data (ptr_server->gnutls_sess, NULL,
                             &session_size);
    session_data = malloc (session_size);
    gnutls_session_get_data (server->gnutls_sess, session_data,
                             &session_size);
    /* save session data to session file */
    gnutls_bye (server->gnutls_sess, GNUTLS_SHUT_RDWR);
    gnutls_deinit (server->gnutls_sess);
    
 - global:
 
    gnutls_certificate_free_credentials (gnutls_xcred);
    gnutls_global_deinit();

2. start new weechat via execvp (load session file):

 - global:
 
    gnutls_global_init ();
    gnutls_certificate_allocate_credentials (&gnutls_xcred);
    gnutls_certificate_set_x509_trust_file (gnutls_xcred,
        "ca.pem", GNUTLS_X509_FMT_PEM);
        
 - for each gnutls server:
 
    gnutls_set_default_priority (server->gnutls_sess);
    gnutls_certificate_type_set_priority  (server->gnutls_sess,
                                           cert_type_prio);
    gnutls_credentials_set (server->gnutls_sess,
                            GNUTLS_CRD_CERTIFICATE,
                            gnutls_xcred);
    /* read session & size (internal stuff not shown here) */
    gnutls_session_set_data (server->gnutls_sess,
                             session_data, session_size);
    gnutls_transport_set_ptr (server->gnutls_sess,
                              (gnutls_transport_ptr)
                              server->sock);
    if (gnutls_handshake (server->gnutls_sess) < 0)
        printf ("handshake failed\n");

Problem: the handshake always failed when restoring weechat session.

Thank you in advance, any help appreciated.

-- 
Cordialement / Best regards
Sebastien.

Web: http://www.flashtux.org - email: address@hidden
IRC: address@hidden - Jabber: address@hidden

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