1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 1999, 2000, 2001 Robert N. M. Watson 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 /* 29 * acl_init -- return a fresh acl structure 30 * acl_dup -- duplicate an acl and return the new copy 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include <sys/types.h> 37 #include "namespace.h" 38 #include <sys/acl.h> 39 #include "un-namespace.h" 40 #include <errno.h> 41 #include <stdlib.h> 42 #include <string.h> 43 #include <assert.h> 44 45 #include "acl_support.h" 46 47 #ifndef CTASSERT 48 #define CTASSERT(x) _CTASSERT(x, __LINE__) 49 #define _CTASSERT(x, y) __CTASSERT(x, y) 50 #define __CTASSERT(x, y) typedef char __assert_ ## y [(x) ? 1 : -1] 51 #endif 52 53 CTASSERT(1 << _ACL_T_ALIGNMENT_BITS > sizeof(struct acl_t_struct)); 54 55 acl_t 56 acl_init(int count) 57 { 58 int error; 59 acl_t acl; 60 61 if (count > ACL_MAX_ENTRIES) { 62 errno = ENOMEM; 63 return (NULL); 64 } 65 if (count < 0) { 66 errno = EINVAL; 67 return (NULL); 68 } 69 70 error = posix_memalign((void *)&acl, 1 << _ACL_T_ALIGNMENT_BITS, 71 sizeof(struct acl_t_struct)); 72 if (error) { 73 errno = error; 74 return (NULL); 75 } 76 77 bzero(acl, sizeof(struct acl_t_struct)); 78 acl->ats_brand = ACL_BRAND_UNKNOWN; 79 acl->ats_acl.acl_maxcnt = ACL_MAX_ENTRIES; 80 81 return (acl); 82 } 83 84 acl_t 85 acl_dup(acl_t acl) 86 { 87 acl_t acl_new; 88 89 acl_new = acl_init(ACL_MAX_ENTRIES); 90 if (acl_new != NULL) { 91 *acl_new = *acl; 92 acl->ats_cur_entry = 0; 93 acl_new->ats_cur_entry = 0; 94 } 95 96 return (acl_new); 97 } 98