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.

       SSL_get_shutdown() returns the current setting.

SEE ALSO

       ssl(7), SSL_shutdown(3), SSL_CTX_set_quiet_shutdown(3), SSL_clear(3), SSL_free(3)

COPYRIGHT

       Copyright 2001-2016 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the OpenSSL license (the "License").  You may not use this file except in
       compliance with the License.  You can obtain a copy in the file LICENSE in the source
       distribution or at <https://www.openssl.org/source/license.html>.