1 /*
2 * Copyright (c) 2013 Apple Inc. All rights reserved.
3 *
4 * @APPLE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. Please obtain a copy of the License at
10 * http://www.opensource.apple.com/apsl/ and read it before using this
11 * file.
12 *
13 * The Original Code and all software distributed under the License are
14 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
15 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
16 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
18 * Please see the License for the specific language governing rights and
19 * limitations under the License.
20 *
21 * @APPLE_LICENSE_HEADER_END@
22 */
23
24 #include <sys/types.h>
25 #include <sys/time.h>
26 #include <sys/errno.h>
27 #include <strings.h>
28 #include <Availability.h>
29
30 #include "gethostuuid_private.h"
31
32 extern int __gethostuuid(uuid_t, const struct timespec *);
33
34 static volatile int (*_gethostuuid_callback)(uuid_t) = (void *)0;
35
36 int
gethostuuid(uuid_t uuid,const struct timespec * timeout)37 gethostuuid(uuid_t uuid, const struct timespec *timeout)
38 {
39 int result;
40
41 result = __gethostuuid(uuid, timeout);
42 if ((result == -1) && (errno == EPERM)) {
43 if (_gethostuuid_callback) {
44 result = _gethostuuid_callback(uuid);
45 } else {
46 /* no fallback, return -1/EPERM */
47 memset(uuid, 0x00, sizeof(*uuid));
48 }
49 }
50
51 return result;
52 }
53
54 /* SPI to call gethostuuid syscall directly, without fallback, need an entitlement */
55 int
_getprivatesystemidentifier(uuid_t uuid,const struct timespec * timeout)56 _getprivatesystemidentifier(uuid_t uuid, const struct timespec *timeout)
57 {
58 return __gethostuuid(uuid, timeout);
59 }
60
61 int
_register_gethostuuid_callback(int (* new_callback)(uuid_t))62 _register_gethostuuid_callback(int (*new_callback)(uuid_t))
63 {
64 if (__sync_bool_compare_and_swap((void **)&_gethostuuid_callback, (void *)0, (void *)new_callback)) {
65 return 0;
66 } else {
67 return EINVAL;
68 }
69 }
70