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.\" $OpenBSD: SSL_set_fd.3,v 1.3 2016/12/06 12:24:33 schwarze Exp $
.\" OpenSSL b97fdb57 Nov 11 09:33:09 2016 +0100
.\"
.\" This file was written by Lutz Jaenicke <jaenicke@openssl.org>.
.\" Copyright (c) 2000, 2013 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: December 6 2016 $
.Dt SSL_SET_FD 3
.Os
.Sh NAME
.Nm SSL_set_fd ,
.Nm SSL_set_rfd ,
.Nm SSL_set_wfd
.Nd connect the SSL object with a file descriptor
.Sh SYNOPSIS
.In openssl/ssl.h
.Ft int
.Fn SSL_set_fd "SSL *ssl" "int fd"
.Ft int
.Fn SSL_set_rfd "SSL *ssl" "int fd"
.Ft int
.Fn SSL_set_wfd "SSL *ssl" "int fd"
.Sh DESCRIPTION
.Fn SSL_set_fd
sets the file descriptor
.Fa fd
as the input/output facility for the TLS/SSL (encrypted) side of
.Fa ssl .
.Fa fd
will typically be the socket file descriptor of a network connection.
.Pp
When performing the operation, a socket
.Vt BIO
is automatically created to interface between the
.Fa ssl
and
.Fa fd .
The
.Vt BIO
and hence the SSL engine inherit the behaviour of
.Fa fd .
If
.Fa fd
is non-blocking, the
.Fa ssl
will also have non-blocking behaviour.
.Pp
If there was already a
.Vt BIO
connected to
.Fa ssl ,
.Xr BIO_free 3
will be called (for both the reading and writing side, if different).
.Pp
.Fn SSL_set_rfd
and
.Fn SSL_set_wfd
perform the respective action, but only for the read channel or the write
channel, which can be set independently.
.Sh RETURN VALUES
The following return values can occur:
.Bl -tag -width Ds
.It 0
The operation failed.
Check the error stack to find out why.
.It 1
The operation succeeded.
.El
.Sh SEE ALSO
.Xr BIO_new 3 ,
.Xr ssl 3 ,
.Xr SSL_accept 3 ,
.Xr SSL_connect 3 ,
.Xr SSL_get_fd 3 ,
.Xr SSL_set_bio 3 ,
.Xr SSL_shutdown 3
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