SSL_set_shutdown, SSL_get_shutdown - manipulate shutdown state of an SSL
connection
#include <openssl/ssl.h>
void SSL_set_shutdown(SSL *ssl, int mode);
int SSL_get_shutdown(const SSL *ssl);
SSL_set_shutdown() sets the shutdown state of
ssl to
mode.
SSL_get_shutdown() returns the shutdown mode of
ssl.
The shutdown state of an ssl connection is a bit-mask 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.
SSL_set_shutdown() does not return diagnostic information.
SSL_get_shutdown() returns the current setting.
ssl(7),
SSL_shutdown(3),
SSL_CTX_set_quiet_shutdown(3),
SSL_clear(3),
SSL_free(3)
Copyright 2001-2018 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the Apache License 2.0 (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>.