SSL_set_shutdown, SSL_get_shutdown - manipulate shutdown state of an SSL
void SSL_set_shutdown(SSL *ssl, int mode);
int SSL_get_shutdown(const SSL *ssl);
sets the shutdown state of ssl
returns the shutdown mode of ssl
The shutdown state of an ssl connection is a bitmask of:
- No shutdown setting, yet.
- A "close notify" shutdown alert was sent to the peer, the
connection is being considered closed and the session is closed and
- A shutdown alert was received form the peer, either a normal "close
notify" or a fatal error.
SSL_SENT_SHUTDOWN and SSL_RECEIVED_SHUTDOWN can be set at the same time.
The shutdown state of the connection is used to determine the state of the ssl
session. If the session is still open, when SSL_clear(3)
is called, it is considered bad and removed according to
RFC2246. The actual condition for a correctly closed session is
SSL_SENT_SHUTDOWN (according to the TLS RFC, it is acceptable to only send the
"close notify" alert but to not wait for the peer's answer, when the
underlying connection is closed). SSL_set_shutdown()
can be used to set
this state without sending a close alert to the peer (see
If a "close notify" was received, SSL_RECEIVED_SHUTDOWN will be set,
for setting SSL_SENT_SHUTDOWN the application must however still call
does not return diagnostic information.
returns the current setting.