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.\" ========================================================================
.\"
.IX Title "SSL_SET_SHUTDOWN 3"
.TH SSL_SET_SHUTDOWN 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.SH "NAME"
SSL_set_shutdown, SSL_get_shutdown \- manipulate shutdown state of an SSL connection
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/ssl.h>
\&
\& void SSL_set_shutdown(SSL *ssl, int mode);
\&
\& int SSL_get_shutdown(const SSL *ssl);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBSSL_set_shutdown()\fR sets the shutdown state of \fBssl\fR to \fBmode\fR.
.PP
\&\fBSSL_get_shutdown()\fR returns the shutdown mode of \fBssl\fR.
.SH "NOTES"
.IX Header "NOTES"
The shutdown state of an ssl connection is a bit mask of:
.IP "0" 4
No shutdown setting, yet.
.IP "\s-1SSL_SENT_SHUTDOWN\s0" 4
.IX 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.
.IP "\s-1SSL_RECEIVED_SHUTDOWN\s0" 4
.IX Item "SSL_RECEIVED_SHUTDOWN"
A shutdown alert was received form the peer, either a normal close_notify
or a fatal error.
.PP
\&\s-1SSL_SENT_SHUTDOWN\s0 and \s-1SSL_RECEIVED_SHUTDOWN\s0 can be set at the same time.
.PP
The shutdown state of the connection is used to determine the state of
the ssl session. If the session is still open, when
\&\fBSSL_clear\fR\|(3) or \fBSSL_free\fR\|(3) is called,
it is considered bad and removed according to \s-1RFC2246.\s0
The actual condition for a correctly closed session is \s-1SSL_SENT_SHUTDOWN\s0
(according to the \s-1TLS RFC,\s0 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).
\&\fBSSL_set_shutdown()\fR can be used to set this state without sending a
close alert to the peer (see \fBSSL_shutdown\fR\|(3)).
.PP
If a close_notify was received, \s-1SSL_RECEIVED_SHUTDOWN\s0 will be set,
for setting \s-1SSL_SENT_SHUTDOWN\s0 the application must however still call
\&\fBSSL_shutdown\fR\|(3) or \fBSSL_set_shutdown()\fR itself.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBSSL_set_shutdown()\fR does not return diagnostic information.
.PP
\&\fBSSL_get_shutdown()\fR returns the current setting.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBssl\fR\|(7), \fBSSL_shutdown\fR\|(3),
\&\fBSSL_CTX_set_quiet_shutdown\fR\|(3),
\&\fBSSL_clear\fR\|(3), \fBSSL_free\fR\|(3)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2001\-2020 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.