Your company here, and a link to your site. Click to find out more.

SSL_set_session.3ossl - Man Page

set a TLS/SSL session to be used during TLS/SSL connect


 #include <openssl/ssl.h>

 int SSL_set_session(SSL *ssl, SSL_SESSION *session);


SSL_set_session() sets session to be used when the TLS/SSL connection is to be established. SSL_set_session() is only useful for TLS/SSL clients. When the session is set, the reference count of session is incremented by 1. If the session is not reused, the reference count is decremented again during SSL_connect(). Whether the session was reused can be queried with the SSL_session_reused(3) call.

If there is already a session set inside ssl (because it was set with SSL_set_session() before or because the same ssl was already used for a connection), SSL_SESSION_free() will be called for that session. This is also the case when session is a NULL pointer. If that old session is still open, it is considered bad and will be removed from the session cache (if used). A session is considered open, if SSL_shutdown(3) was not called for the connection (or at least SSL_set_shutdown(3) was used to set the SSL_SENT_SHUTDOWN state).


SSL_SESSION objects keep internal link information about the session cache list, when being inserted into one SSL_CTX object's session cache. One SSL_SESSION object, regardless of its reference count, must therefore only be used with one SSL_CTX object (and the SSL objects created from this SSL_CTX object).

Return Values

The following return values can occur:


The operation failed; check the error stack to find out the reason.


The operation succeeded.

See Also

ssl(7), SSL_SESSION_free(3), SSL_get_session(3), SSL_session_reused(3), SSL_CTX_set_session_cache_mode(3)

Referenced By

SSL_clear.3ossl(3), SSL_CTX_sess_number.3ossl(3), SSL_CTX_set_session_cache_mode.3ossl(3), SSL_CTX_set_tlsext_ticket_key_cb.3ossl(3), SSL_session_reused.3ossl(3).

2024-04-04 3.2.1 OpenSSL