gnutls_session_get_id man page

gnutls_session_get_id — API function


#include <gnutls/gnutls.h>

int gnutls_session_get_id(gnutls_session_t session, void * session_id, size_t * session_id_size);


gnutls_session_t session

is a gnutls_session_t type.

void * session_id

is a pointer to space to hold the session id.

size_t * session_id_size

initially should contain the maximum  session_id size and will be updated.


Returns the current session ID. This can be used if you want to check if the next session you tried to resume was actually resumed.  That is because resumed sessions share the same session ID with the original session.

The session ID is selected by the server, that identify the current session.  In all supported TLS protocols, the session id is less than GNUTLS_MAX_SESSION_ID_SIZE.


On success, GNUTLS_E_SUCCESS (0) is returned, otherwise an error code is returned.

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3.6.2 gnutls