.\" $OpenBSD: SSL_dup.3,v 1.5 2022/07/13 22:05:53 schwarze Exp $
.\"
.\" Copyright (c) 2016 Ingo Schwarze <schwarze@openbsd.org>
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.Dd $Mdocdate: July 13 2022 $
.Dt SSL_DUP 3
.Os
.Sh NAME
.Nm SSL_dup
.Nd deep copy of an SSL object
.Sh SYNOPSIS
.In openssl/ssl.h
.Ft SSL *
.Fo SSL_dup
.Fa "SSL *ssl"
.Fc
.Sh DESCRIPTION
.Fn SSL_dup
constructs a new
.Vt SSL
object in the same context as
.Fa ssl
and copies much of the contained data from
.Fa ssl
to the new
.Vt SSL
object, but many fields, for example tlsext data, are not copied.
.Pp
As an exception from deep copying, if a session is already established,
the new object shares
.Fa ssl->cert
with the original object.
.Sh RETURN VALUES
.Fn SSL_dup
returns the new
.Vt SSL
object or
.Dv NULL
on failure.
.Sh SEE ALSO
.Xr ssl 3 ,
.Xr SSL_clear 3 ,
.Xr SSL_copy_session_id 3 ,
.Xr SSL_free 3 ,
.Xr SSL_new 3 ,
.Xr SSL_set_security_level 3
.Sh HISTORY
.Fn SSL_dup
first appeared in SSLeay 0.8.0 and has been available since
.Ox 2.4 .