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    SSL_CTX_sess_set_get_cb

    
           SSL_CTX_sess_get_remove_cb, SSL_CTX_sess_get_get_cb - provide callback
           functions for server side external session caching
    
    
    

    SYNOPSIS

            #include <openssl/ssl.h>
    
            void SSL_CTX_sess_set_new_cb(SSL_CTX *ctx,
                                         int (*new_session_cb)(SSL *, SSL_SESSION *));
            void SSL_CTX_sess_set_remove_cb(SSL_CTX *ctx,
                      void (*remove_session_cb)(SSL_CTX *ctx, SSL_SESSION *));
            void SSL_CTX_sess_set_get_cb(SSL_CTX *ctx,
                      SSL_SESSION (*get_session_cb)(SSL *, unsigned char *, int, int *));
    
            int (*SSL_CTX_sess_get_new_cb(SSL_CTX *ctx))(struct ssl_st *ssl, SSL_SESSION *sess);
            void (*SSL_CTX_sess_get_remove_cb(SSL_CTX *ctx))(struct ssl_ctx_st *ctx, SSL_SESSION *sess);
            SSL_SESSION *(*SSL_CTX_sess_get_get_cb(SSL_CTX *ctx))(struct ssl_st *ssl, unsigned char *data, int len, int *copy);
    
            int (*new_session_cb)(struct ssl_st *ssl, SSL_SESSION *sess);
            void (*remove_session_cb)(struct ssl_ctx_st *ctx, SSL_SESSION *sess);
            SSL_SESSION *(*get_session_cb)(struct ssl_st *ssl, unsigned char *data,
                          int len, int *copy);
    
    
    

    DESCRIPTION

           SSL_CTX_sess_set_new_cb() sets the callback function, which is
           automatically called whenever a new session was negotiated.
    
           SSL_CTX_sess_set_remove_cb() sets the callback function, which is
           automatically called whenever a session is removed by the SSL engine,
           because it is considered faulty or the session has become obsolete
           because of exceeding the timeout value.
    
           SSL_CTX_sess_set_get_cb() sets the callback function which is called,
           whenever a SSL/TLS client proposed to resume a session but the session
           could not be found in the internal session cache (see
           SSL_CTX_set_session_cache_mode(3)).  (SSL/TLS server only.)
    
           SSL_CTX_sess_get_new_cb(), SSL_CTX_sess_get_remove_cb(), and
           SSL_CTX_sess_get_get_cb() allow to retrieve the function pointers of
           the provided callback functions. If a callback function has not been
           set, the NULL pointer is returned.
    
    
    

    NOTES

           In order to allow external session caching, synchronization with the
           internal session cache is realized via callback functions. Inside these
           callback functions, session can be saved to disk or put into a database
           using the d2i_SSL_SESSION(3) interface.
    
           The new_session_cb() is called, whenever a new session has been
           negotiated and session caching is enabled (see
           SSL_CTX_set_session_cache_mode(3)).  The new_session_cb() is passed the
           ssl connection and the ssl session sess. If the callback returns 0, the
           session will be immediately removed again.
           the reference count is not incremented and therefore the session must
           not be explicitly freed with SSL_SESSION_free(3).
    
    
    

    SEE ALSO

           ssl(3), d2i_SSL_SESSION(3), SSL_CTX_set_session_cache_mode(3),
           SSL_CTX_flush_sessions(3), SSL_SESSION_free(3), SSL_CTX_free(3)
    
    
    

    1.0.1e 2013-02-11 SSL_CTX_sess_set_get_cb(3)

    
    
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