1/*
2 * uuid_time.c --- Interpret the time field from a uuid.  This program
3 * 	violates the UUID abstraction barrier by reaching into the guts
4 *	of a UUID and interpreting it.
5 *
6 * Copyright (C) 1998, 1999 Theodore Ts'o.
7 *
8 * %Begin-Header%
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, and the entire permission notice in its entirety,
14 *    including the disclaimer of warranties.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote
19 *    products derived from this software without specific prior
20 *    written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF
25 * WHICH ARE HEREBY DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE
26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
28 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
29 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
30 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
32 * USE OF THIS SOFTWARE, EVEN IF NOT ADVISED OF THE POSSIBILITY OF SUCH
33 * DAMAGE.
34 * %End-Header%
35 */
36
37#include <stdio.h>
38#include <unistd.h>
39#include <stdlib.h>
40#include <sys/types.h>
41#include <sys/time.h>
42#include <time.h>
43
44#include "uuidP.h"
45
46time_t uuid_time(const uuid_t uu, struct timeval *ret_tv)
47{
48	struct timeval		tv;
49	struct uuid		uuid;
50	uint32_t		high;
51	uint64_t		clock_reg;
52
53	uuid_unpack(uu, &uuid);
54
55	high = uuid.time_mid | ((uuid.time_hi_and_version & 0xFFF) << 16);
56	clock_reg = uuid.time_low | ((uint64_t) high << 32);
57
58	clock_reg -= (((uint64_t) 0x01B21DD2) << 32) + 0x13814000;
59	tv.tv_sec = clock_reg / 10000000;
60	tv.tv_usec = (clock_reg % 10000000) / 10;
61
62	if (ret_tv)
63		*ret_tv = tv;
64
65	return tv.tv_sec;
66}
67
68int uuid_type(const uuid_t uu)
69{
70	struct uuid		uuid;
71
72	uuid_unpack(uu, &uuid);
73	return ((uuid.time_hi_and_version >> 12) & 0xF);
74}
75
76int uuid_variant(const uuid_t uu)
77{
78	struct uuid		uuid;
79	int			var;
80
81	uuid_unpack(uu, &uuid);
82	var = uuid.clock_seq;
83
84	if ((var & 0x8000) == 0)
85		return UUID_VARIANT_NCS;
86	if ((var & 0x4000) == 0)
87		return UUID_VARIANT_DCE;
88	if ((var & 0x2000) == 0)
89		return UUID_VARIANT_MICROSOFT;
90	return UUID_VARIANT_OTHER;
91}
92
93#ifdef DEBUG
94static const char *variant_string(int variant)
95{
96	switch (variant) {
97	case UUID_VARIANT_NCS:
98		return "NCS";
99	case UUID_VARIANT_DCE:
100		return "DCE";
101	case UUID_VARIANT_MICROSOFT:
102		return "Microsoft";
103	default:
104		return "Other";
105	}
106}
107
108
109int
110main(int argc, char **argv)
111{
112	uuid_t		buf;
113	time_t		time_reg;
114	struct timeval	tv;
115	int		type, variant;
116
117	if (argc != 2) {
118		fprintf(stderr, "Usage: %s uuid\n", argv[0]);
119		exit(1);
120	}
121	if (uuid_parse(argv[1], buf)) {
122		fprintf(stderr, "Invalid UUID: %s\n", argv[1]);
123		exit(1);
124	}
125	variant = uuid_variant(buf);
126	type = uuid_type(buf);
127	time_reg = uuid_time(buf, &tv);
128
129	printf("UUID variant is %d (%s)\n", variant, variant_string(variant));
130	if (variant != UUID_VARIANT_DCE) {
131		printf("Warning: This program only knows how to interpret "
132		       "DCE UUIDs.\n\tThe rest of the output is likely "
133		       "to be incorrect!!\n");
134	}
135	printf("UUID type is %d", type);
136	switch (type) {
137	case 1:
138		printf(" (time based)\n");
139		break;
140	case 2:
141		printf(" (DCE)\n");
142		break;
143	case 3:
144		printf(" (name-based)\n");
145		break;
146	case 4:
147		printf(" (random)\n");
148		break;
149	default:
150		printf("\n");
151	}
152	if (type != 1) {
153		printf("Warning: not a time-based UUID, so UUID time "
154		       "decoding will likely not work!\n");
155	}
156	printf("UUID time is: (%ld, %ld): %s\n", tv.tv_sec, (long)tv.tv_usec,
157	       ctime(&time_reg));
158
159	return 0;
160}
161#endif
162