.\" Copyright (c) 2002, 2003 Networks Associates Technology, Inc.
.\" All rights reserved.
.\"
.\" This software was developed for the FreeBSD Project by Chris
.\" Costello at Safeport Network Services and Network Associates Labs,
.\" the Security Research Division of Network Associates, Inc. under
.\" DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
.\" DARPA CHATS research program.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
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.\"    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.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" $FreeBSD$
.\"
.Dd August 22, 2003
.Dt MAC_PREPARE 3
.Os
.Sh NAME
.Nm mac_prepare , mac_prepare_type , mac_prepare_file_label ,
.Nm mac_prepare_ifnet_label , mac_prepare_process_label
.Nd allocate appropriate storage for
.Vt mac_t
.Sh SYNOPSIS
.In sys/mac.h
.Ft int
.Fn mac_prepare "mac_t *mac" "const char *elements"
.Ft int
.Fn mac_prepare_type "mac_t *mac" "const char *name"
.Ft int
.Fn mac_prepare_file_label "mac_t *mac"
.Ft int
.Fn mac_prepare_ifnet_label "mac_t *mac"
.Ft int
.Fn mac_prepare_process_label "mac_t *mac"
.Sh DESCRIPTION
The
.Nm
family of functions allocates the appropriate amount of storage and initializes
.Fa *mac
for use by
.Xr mac_get 3 .
When the resulting label is passed into the
.Xr mac_get 3
functions, the kernel will attempt to fill in the label elements specified
when the label was prepared.
Elements are specified in a nul-terminated string, using commas to
delimit fields.
Element names may be prefixed with the
.Ql \&?
character to indicate that a failure by the kernel to retrieve that
element should not be considered fatal.
.Pp
The
.Fn mac_prepare
function accepts a list of policy names as a parameter, and allocates the
storage to fit those label elements accordingly.
The remaining functions in the family make use of system defaults defined
in
.Xr mac.conf 5
instead of an explicit
.Va elements
argument, deriving the default from the specified object type.
.Pp
.Fn mac_prepare_type
allocates the storage to fit an object label of the type specified by
the
.Va name
argument.
The
.Fn mac_prepare_file_label ,
.Fn mac_prepare_ifnet_label ,
and
.Fn mac_prepare_process_label
functions are equivalent to invocations of
.Fn mac_prepare_type
with arguments of
.Qq file ,
.Qq ifnet ,
and
.Qq process
respectively.
.Sh RETURN VALUES
.Rv -std
.Sh SEE ALSO
.Xr mac 3 ,
.Xr mac_free 3 ,
.Xr mac_get 3 ,
.Xr mac_is_present 3 ,
.Xr mac_set 3 ,
.Xr mac 4 ,
.Xr mac.conf 5 ,
.Xr maclabel 7
.Sh STANDARDS
POSIX.1e is described in IEEE POSIX.1e draft 17.
Discussion of the draft
continues on the cross-platform POSIX.1e implementation mailing list.
To join this list, see the
.Fx
POSIX.1e implementation page
for more information.
.Sh HISTORY
Support for Mandatory Access Control was introduced in
.Fx 5.0
as part of the
.Tn TrustedBSD
Project.
Support for generic object types first appeared in
.Fx 5.2 .