1/*
2 * Copyright (c) 2004-2011 Apple Inc. All rights reserved.
3 *
4 * %Begin-Header%
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, and the entire permission notice in its entirety,
10 *    including the disclaimer of warranties.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote
15 *    products derived from this software without specific prior
16 *    written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
19 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF
21 * WHICH ARE HEREBY DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
24 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
25 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
26 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
28 * USE OF THIS SOFTWARE, EVEN IF NOT ADVISED OF THE POSSIBILITY OF SUCH
29 * DAMAGE.
30 * %End-Header%
31 */
32
33#include <uuid/uuid.h>
34
35#include <stdint.h>
36#include <string.h>
37
38#include <sys/random.h>
39#include <sys/socket.h>
40#include <sys/systm.h>
41#include <sys/time.h>
42
43extern int uuid_get_ethernet(u_int8_t *);
44
45UUID_DEFINE(UUID_NULL, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
46
47static void
48read_node(uint8_t *node)
49{
50#if NETWORKING
51	if (uuid_get_ethernet(node) == 0)
52		return;
53#endif /* NETWORKING */
54
55	read_random(node, 6);
56	node[0] |= 0x01;
57}
58
59static uint64_t
60read_time(void)
61{
62	struct timespec tv;
63
64	nanotime(&tv);
65
66	return (tv.tv_sec * 10000000ULL) + (tv.tv_nsec / 100ULL) + 0x01B21DD213814000ULL;
67}
68
69void
70uuid_clear(uuid_t uu)
71{
72	memset(uu, 0, sizeof(uuid_t));
73}
74
75int
76uuid_compare(const uuid_t uu1, const uuid_t uu2)
77{
78	return memcmp(uu1, uu2, sizeof(uuid_t));
79}
80
81void
82uuid_copy(uuid_t dst, const uuid_t src)
83{
84	memcpy(dst, src, sizeof(uuid_t));
85}
86
87void
88uuid_generate_random(uuid_t out)
89{
90	read_random(out, sizeof(uuid_t));
91
92	out[6] = (out[6] & 0x0F) | 0x40;
93	out[8] = (out[8] & 0x3F) | 0x80;
94}
95
96void
97uuid_generate_time(uuid_t out)
98{
99	uint64_t time;
100
101	read_node(&out[10]);
102	read_random(&out[8], 2);
103
104	time = read_time();
105	out[0] = (uint8_t)(time >> 24);
106	out[1] = (uint8_t)(time >> 16);
107	out[2] = (uint8_t)(time >> 8);
108	out[3] = (uint8_t)time;
109	out[4] = (uint8_t)(time >> 40);
110	out[5] = (uint8_t)(time >> 32);
111	out[6] = (uint8_t)(time >> 56);
112	out[7] = (uint8_t)(time >> 48);
113
114	out[6] = (out[6] & 0x0F) | 0x10;
115	out[8] = (out[8] & 0x3F) | 0x80;
116}
117
118void
119uuid_generate(uuid_t out)
120{
121	uuid_generate_random(out);
122}
123
124int
125uuid_is_null(const uuid_t uu)
126{
127	return !memcmp(uu, UUID_NULL, sizeof(uuid_t));
128}
129
130int
131uuid_parse(const uuid_string_t in, uuid_t uu)
132{
133	int n = 0;
134
135	sscanf(in,
136		"%2hhx%2hhx%2hhx%2hhx-"
137		"%2hhx%2hhx-"
138		"%2hhx%2hhx-"
139		"%2hhx%2hhx-"
140		"%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx%n",
141		&uu[0], &uu[1], &uu[2], &uu[3],
142		&uu[4], &uu[5],
143		&uu[6], &uu[7],
144		&uu[8], &uu[9],
145		&uu[10], &uu[11], &uu[12], &uu[13], &uu[14], &uu[15], &n);
146
147	return (n != 36 || in[n] != '\0' ? -1 : 0);
148}
149
150void
151uuid_unparse_lower(const uuid_t uu, uuid_string_t out)
152{
153	snprintf(out,
154		sizeof(uuid_string_t),
155		"%02x%02x%02x%02x-"
156		"%02x%02x-"
157		"%02x%02x-"
158		"%02x%02x-"
159		"%02x%02x%02x%02x%02x%02x",
160		uu[0], uu[1], uu[2], uu[3],
161		uu[4], uu[5],
162		uu[6], uu[7],
163		uu[8], uu[9],
164		uu[10], uu[11], uu[12], uu[13], uu[14], uu[15]);
165}
166
167void
168uuid_unparse_upper(const uuid_t uu, uuid_string_t out)
169{
170	snprintf(out,
171		sizeof(uuid_string_t),
172		"%02X%02X%02X%02X-"
173		"%02X%02X-"
174		"%02X%02X-"
175		"%02X%02X-"
176		"%02X%02X%02X%02X%02X%02X",
177		uu[0], uu[1], uu[2], uu[3],
178		uu[4], uu[5],
179		uu[6], uu[7],
180		uu[8], uu[9],
181		uu[10], uu[11], uu[12], uu[13], uu[14], uu[15]);
182}
183
184void
185uuid_unparse(const uuid_t uu, uuid_string_t out)
186{
187	uuid_unparse_upper(uu, out);
188}
189