ag/cpython-source-deps
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Import OpenSSL 1.1.0f

Browse Source
This commit is contained in:
Steve Dower
2017-09-07 16:27:43 -07:00
committed by Steve Dower
parent ccd3ab4aff
commit f4b81cb7c9
3340 changed files with 325158 additions and 557542 deletions
Download Patch File Download Diff File Expand all files Collapse all files

37
doc/ssl/SSL_shutdown.pod
View File

@@ -12,7 +12,7 @@ SSL_shutdown - shut down a TLS/SSL connection
=head1 DESCRIPTION
SSL_shutdown() shuts down an active TLS/SSL connection. It sends the
SSL_shutdown() shuts down an active TLS/SSL connection. It sends the
"close notify" shutdown alert to the peer.
=head1 NOTES
@@ -50,21 +50,19 @@ with 1.
=item If the peer already sent the "close notify" alert B<and> it was
already processed implicitly inside another function
(L<SSL_read(3)|SSL_read(3)>), the SSL_RECEIVED_SHUTDOWN flag is set.
(L<SSL_read(3)>), the SSL_RECEIVED_SHUTDOWN flag is set.
SSL_shutdown() will send the "close notify" alert, set the SSL_SENT_SHUTDOWN
flag and will immediately return with 1.
Whether SSL_RECEIVED_SHUTDOWN is already set can be checked using the
SSL_get_shutdown() (see also L<SSL_set_shutdown(3)|SSL_set_shutdown(3)> call.
SSL_get_shutdown() (see also L<SSL_set_shutdown(3)> call.
=back
It is therefore recommended, to check the return value of SSL_shutdown()
and call SSL_shutdown() again, if the bidirectional shutdown is not yet
complete (return value of the first call is 0). As the shutdown is not
specially handled in the SSLv2 protocol, SSL_shutdown() will succeed on
the first call.
complete (return value of the first call is 0).
The behaviour of SSL_shutdown() additionally depends on the underlying BIO.
The behaviour of SSL_shutdown() additionally depends on the underlying BIO.
If the underlying BIO is B<blocking>, SSL_shutdown() will only return once the
handshake step has been finished or an error occurred.
@@ -82,7 +80,7 @@ into or retrieved out of the BIO before being able to continue.
SSL_shutdown() can be modified to only set the connection to "shutdown"
state but not actually send the "close notify" alert messages,
see L<SSL_CTX_set_quiet_shutdown(3)|SSL_CTX_set_quiet_shutdown(3)>.
see L<SSL_CTX_set_quiet_shutdown(3)>.
When "quiet shutdown" is enabled, SSL_shutdown() will always succeed
and return 1.
@@ -96,7 +94,7 @@ The following return values can occur:
The shutdown is not yet finished. Call SSL_shutdown() for a second time,
if a bidirectional shutdown shall be performed.
The output of L<SSL_get_error(3)|SSL_get_error(3)> may be misleading, as an
The output of L<SSL_get_error(3)> may be misleading, as an
erroneous SSL_ERROR_SYSCALL may be flagged even though no error occurred.
=item Z<>1
@@ -109,17 +107,26 @@ and the peer's "close notify" alert was received.
The shutdown was not successful because a fatal error occurred either
at the protocol level or a connection failure occurred. It can also occur if
action is need to continue the operation for non-blocking BIOs.
Call L<SSL_get_error(3)|SSL_get_error(3)> with the return value B<ret>
Call L<SSL_get_error(3)> with the return value B<ret>
to find out the reason.
=back
=head1 SEE ALSO
L<SSL_get_error(3)|SSL_get_error(3)>, L<SSL_connect(3)|SSL_connect(3)>,
L<SSL_accept(3)|SSL_accept(3)>, L<SSL_set_shutdown(3)|SSL_set_shutdown(3)>,
L<SSL_CTX_set_quiet_shutdown(3)|SSL_CTX_set_quiet_shutdown(3)>,
L<SSL_clear(3)|SSL_clear(3)>, L<SSL_free(3)|SSL_free(3)>,
L<ssl(3)|ssl(3)>, L<bio(3)|bio(3)>
L<SSL_get_error(3)>, L<SSL_connect(3)>,
L<SSL_accept(3)>, L<SSL_set_shutdown(3)>,
L<SSL_CTX_set_quiet_shutdown(3)>,
L<SSL_clear(3)>, L<SSL_free(3)>,
L<ssl(3)>, L<bio(3)>
=head1 COPYRIGHT
Copyright 2000-2016 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