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.\" $OpenBSD: BIO_get_data.3,v 1.3 2018/03/23 23:18:17 schwarze Exp $
.\" selective merge up to: OpenSSL e90fc053 Jul 15 09:39:45 2017 -0400
.\"
.\" This file is a derived work.
.\" The changes are covered by the following Copyright and license:
.\"
.\" Copyright (c) 2018 Ingo Schwarze <schwarze@openbsd.org>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.\" The original file was written by Matt Caswell <matt@openssl.org>.
.\" Copyright (c) 2016 The OpenSSL Project. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\"
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\"
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in
.\" the documentation and/or other materials provided with the
.\" distribution.
.\"
.\" 3. All advertising materials mentioning features or use of this
.\" software must display the following acknowledgment:
.\" "This product includes software developed by the OpenSSL Project
.\" for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
.\"
.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
.\" endorse or promote products derived from this software without
.\" prior written permission. For written permission, please contact
.\" openssl-core@openssl.org.
.\"
.\" 5. Products derived from this software may not be called "OpenSSL"
.\" nor may "OpenSSL" appear in their names without prior written
.\" permission of the OpenSSL Project.
.\"
.\" 6. Redistributions of any form whatsoever must retain the following
.\" acknowledgment:
.\" "This product includes software developed by the OpenSSL Project
.\" for use in the OpenSSL Toolkit (http://www.openssl.org/)"
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
.\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
.\" OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd $Mdocdate: March 23 2018 $
.Dt BIO_GET_DATA 3
.Os
.Sh NAME
.Nm BIO_set_data ,
.Nm BIO_get_data ,
.Nm BIO_set_init ,
.Nm BIO_set_shutdown ,
.Nm BIO_get_shutdown
.Nd manage BIO state information
.Sh SYNOPSIS
.In openssl/bio.h
.Ft void
.Fo BIO_set_data
.Fa "BIO *a"
.Fa "void *ptr"
.Fc
.Ft void *
.Fo BIO_get_data
.Fa "BIO *a"
.Fc
.Ft void
.Fo BIO_set_init
.Fa "BIO *a"
.Fa "int init"
.Fc
.Ft void
.Fo BIO_set_shutdown
.Fa "BIO *a"
.Fa "int shutdown"
.Fc
.Ft int
.Fo BIO_get_shutdown
.Fa "BIO *a"
.Fc
.Sh DESCRIPTION
These functions are mainly useful when implementing a custom BIO.
.Pp
The
.Fn BIO_set_data
function associates the custom data pointed to by
.Fa ptr
with the
.Fa "BIO a" .
This data can subsequently be retrieved via a call to
.Fn BIO_get_data .
This can be used by custom BIOs for storing implementation specific
information.
.Pp
The
.Fn BIO_set_init
function sets the
.Fa init
flag in
.Fa a
to the specified value.
A non-zero value indicates that initialisation is complete,
whilst zero indicates that it is not.
Often initialisation will complete
during initial construction of the BIO.
For some BIOs however, initialisation may not be complete until
additional steps have been taken, for example through calling custom
ctrls.
.Pp
The
.Fn BIO_set_shutdown
and
.Fn BIO_get_shutdown
functions are low-level interfaces to forcefully set and get the
.Fa shutdown
flag of
.Fa a ,
circumventing type-dependent sanity checks,
exclusively intended for implementing a new BIO type.
The
.Fa shutdown
argument must be either
.Dv BIO_CLOSE
or
.Dv BIO_NOCLOSE .
When merely using a
.Vt BIO
object, call
.Xr BIO_set_close 3
and
.Xr BIO_get_close 3
instead.
.Sh RETURN VALUES
.Fn BIO_get_data
returns a pointer to the implementation specific custom data associated
with
.Fa a ,
or
.Dv NULL
if none is set.
.Pp
.Fn BIO_get_shutdown
returns the value previously set with
.Fn BIO_set_shutdown
or with
.Xr BIO_set_close 3 .
.Sh SEE ALSO
.Xr BIO_meth_new 3 ,
.Xr BIO_new 3 ,
.Xr BIO_set_close 3
.Sh HISTORY
These functions first appeared in OpenSSL 1.1.0
and have been available since
.Ox 6.3 .
|
