/usr/man/cat.3/SSL_set_shutdown.3

SSL_set_shutdown(3)          OpenSSL          SSL_set_shutdown(3)

NAME

     SSL_set_shutdown, SSL_get_shutdown - manipulate shutdown
     state of an SSL connection

SYNOPSIS

      #include <openssl/ssl.h>

      void SSL_set_shutdown(SSL *ssl, int mode);

      int SSL_get_shutdown(const SSL *ssl);

DESCRIPTION

     SSL_set_shutdown() sets the shutdown state of ssl to mode.

     SSL_get_shutdown() returns the shutdown mode of ssl.

NOTES

     The shutdown state of an ssl connection is a bitmask of:

     0   No shutdown setting, yet.

     SSL_SENT_SHUTDOWN
         A "close notify" shutdown alert was sent to the peer,
         the connection is being considered closed and the
         session is closed and correct.

     SSL_RECEIVED_SHUTDOWN
         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) or SSL_free(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 SSL_shutdown(3)).

     If a "close notify" was received, SSL_RECEIVED_SHUTDOWN will
     be set, for setting SSL_SENT_SHUTDOWN the application must
     however still call SSL_shutdown(3) or SSL_set_shutdown()
     itself.

RETURN VALUES

     SSL_set_shutdown() does not return diagnostic information.

1.0.2t               Last change: 2019-09-10                    1

SSL_set_shutdown(3)          OpenSSL          SSL_set_shutdown(3)

     SSL_get_shutdown() returns the current setting.

SEE ALSO

     ssl(3), SSL_shutdown(3), SSL_CTX_set_quiet_shutdown(3),
     SSL_clear(3), SSL_free(3)

1.0.2t               Last change: 2019-09-10                    2

See also SSL_get_shutdown(3)