b97fdb57a2
Reviewed-by: Rich Salz <rsalz@openssl.org> (Merged from https://github.com/openssl/openssl/pull/1900)
81 lines
2.2 KiB
Text
81 lines
2.2 KiB
Text
=pod
|
|
|
|
=head1 NAME
|
|
|
|
SSL_set_shutdown, SSL_get_shutdown - manipulate shutdown state of an SSL connection
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/ssl.h>
|
|
|
|
void SSL_set_shutdown(SSL *ssl, int mode);
|
|
|
|
int SSL_get_shutdown(const SSL *ssl);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
SSL_set_shutdown() sets the shutdown state of B<ssl> to B<mode>.
|
|
|
|
SSL_get_shutdown() returns the shutdown mode of B<ssl>.
|
|
|
|
=head1 NOTES
|
|
|
|
The shutdown state of an ssl connection is a bitmask of:
|
|
|
|
=over 4
|
|
|
|
=item Z<>0
|
|
|
|
No shutdown setting, yet.
|
|
|
|
=item 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.
|
|
|
|
=item SSL_RECEIVED_SHUTDOWN
|
|
|
|
A shutdown alert was received form the peer, either a normal "close notify"
|
|
or a fatal error.
|
|
|
|
=back
|
|
|
|
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
|
|
L<SSL_clear(3)> or L<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 L<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
|
|
L<SSL_shutdown(3)> or SSL_set_shutdown() itself.
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
SSL_set_shutdown() does not return diagnostic information.
|
|
|
|
SSL_get_shutdown() returns the current setting.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<ssl(7)>, L<SSL_shutdown(3)>,
|
|
L<SSL_CTX_set_quiet_shutdown(3)>,
|
|
L<SSL_clear(3)>, L<SSL_free(3)>
|
|
|
|
=head1 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
|
|
L<https://www.openssl.org/source/license.html>.
|
|
|
|
=cut
|