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/*
* Copyright (C) 2000 Internet Software Consortium.
*
* 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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS
* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
* CONSORTIUM 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.
*/
/* $Id: fsaccess.c,v 1.2 2000/06/21 21:56:34 tale Exp $ */
/*
* This file contains the OS-independent functionality of the API.
*/
#include <isc/fsaccess.h>
#include <isc/result.h>
#include <isc/util.h>
/*
* Shorthand. Maybe ISC__FSACCESS_PERMISSIONBITS should not even be in
* <isc/fsaccess.h>. Could check consistency with sizeof(isc_fsaccess_t)
* and the number of bits in each function.
*/
#define STEP (ISC__FSACCESS_PERMISSIONBITS)
#define GROUP (STEP)
#define OTHER (STEP * 2)
void
isc_fsaccess_add(int trustee, int permission, isc_fsaccess_t *access) {
REQUIRE(trustee <= 0x7);
REQUIRE(permission <= 0xFF);
if ((trustee & ISC_FSACCESS_OWNER) != 0)
*access |= permission;
if ((trustee & ISC_FSACCESS_GROUP) != 0)
*access |= (permission << GROUP);
if ((trustee & ISC_FSACCESS_OTHER) != 0)
*access |= (permission << OTHER);
}
void
isc_fsaccess_remove(int trustee, int permission, isc_fsaccess_t *access) {
REQUIRE(trustee <= 0x7);
REQUIRE(permission <= 0xFF);
if ((trustee & ISC_FSACCESS_OWNER) != 0)
*access &= ~permission;
if ((trustee & ISC_FSACCESS_GROUP) != 0)
*access &= ~(permission << GROUP);
if ((trustee & ISC_FSACCESS_OTHER) != 0)
*access &= ~(permission << OTHER);
}
static isc_result_t
check_bad_bits(isc_fsaccess_t access, isc_boolean_t is_dir) {
isc_fsaccess_t bits;
/*
* Check for disallowed user bits.
*/
if (is_dir)
bits = ISC_FSACCESS_READ |
ISC_FSACCESS_WRITE |
ISC_FSACCESS_EXECUTE;
else
bits = ISC_FSACCESS_CREATECHILD |
ISC_FSACCESS_ACCESSCHILD |
ISC_FSACCESS_DELETECHILD |
ISC_FSACCESS_LISTDIRECTORY;
/*
* Set group bad bits.
*/
bits |= bits << STEP;
/*
* Set other bad bits.
*/
bits |= bits << STEP;
if ((access & bits) != 0) {
if (is_dir)
return (ISC_R_NOTFILE);
else
return (ISC_R_NOTDIRECTORY);
}
return (ISC_R_SUCCESS);
}
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