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/*-
* Copyright (c) 2008, 2009 Edward Tomasz Napierała <trasz@FreeBSD.org>
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <assert.h>
#include <errno.h>
#include <sys/acl.h>
#include "acl_support.h"
/*
* An ugly detail of the implementation - fortunately not visible
* to the API users - is the "branding": libc needs to keep track
* of what "brand" ACL is: NFSv4, POSIX.1e or unknown. It happens
* automatically - for example, during acl_get_file(3) ACL gets
* branded according to the "type" argument; during acl_set_permset
* ACL, if its brand is unknown it gets branded as NFSv4 if any of the
* NFSv4 permissions that are not valid for POSIX.1e ACL are set etc.
* Branding information is used for printing out the ACL (acl_to_text(3)),
* veryfying acl_set_whatever arguments (checking against setting
* bits that are valid only for NFSv4 in ACL branded as POSIX.1e) etc.
*/
static acl_t
entry2acl(acl_entry_t entry)
{
acl_t aclp;
aclp = (acl_t)(((long)entry >> _ACL_T_ALIGNMENT_BITS) << _ACL_T_ALIGNMENT_BITS);
return (aclp);
}
/*
* Return brand of an ACL.
*/
int
_acl_brand(const acl_t acl)
{
return (acl->ats_brand);
}
int
_entry_brand(const acl_entry_t entry)
{
return (_acl_brand(entry2acl(entry)));
}
/*
* Return 1, iff branding ACL as "brand" is ok.
*/
int
_acl_brand_may_be(const acl_t acl, int brand)
{
if (_acl_brand(acl) == ACL_BRAND_UNKNOWN)
return (1);
if (_acl_brand(acl) == brand)
return (1);
return (0);
}
int
_entry_brand_may_be(const acl_entry_t entry, int brand)
{
return (_acl_brand_may_be(entry2acl(entry), brand));
}
/*
* Brand ACL as "brand".
*/
void
_acl_brand_as(acl_t acl, int brand)
{
assert(_acl_brand_may_be(acl, brand));
acl->ats_brand = brand;
}
void
_entry_brand_as(const acl_entry_t entry, int brand)
{
_acl_brand_as(entry2acl(entry), brand);
}
int
_acl_type_not_valid_for_acl(const acl_t acl, acl_type_t type)
{
switch (_acl_brand(acl)) {
case ACL_BRAND_NFS4:
if (type == ACL_TYPE_NFS4)
return (0);
break;
case ACL_BRAND_POSIX:
if (type == ACL_TYPE_ACCESS || type == ACL_TYPE_DEFAULT)
return (0);
break;
}
return (-1);
}
void
_acl_brand_from_type(acl_t acl, acl_type_t type)
{
switch (type) {
case ACL_TYPE_NFS4:
_acl_brand_as(acl, ACL_BRAND_NFS4);
break;
case ACL_TYPE_ACCESS:
case ACL_TYPE_DEFAULT:
_acl_brand_as(acl, ACL_BRAND_POSIX);
break;
default:
/* XXX: What to do here? */
break;
}
}
int
acl_get_brand_np(acl_t acl, int *brand_p)
{
if (acl == NULL || brand_p == NULL) {
errno = EINVAL;
return (-1);
}
*brand_p = _acl_brand(acl);
return (0);
}
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