summaryrefslogtreecommitdiffstats
path: root/contrib/uuid/uuid_time.c
blob: f25f5c90fe5acfd6cc0fa3e6d8532581ac240ca5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
/*
 * uuid_time.c --- Interpret the time field from a uuid.  This program
 * 	violates the UUID abstraction barrier by reaching into the guts
 *	of a UUID and interpreting it.
 *
 * Copyright (C) 1998, 1999 Theodore Ts'o.
 *
 * %Begin-Header%
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, and the entire permission notice in its entirety,
 *    including the disclaimer of warranties.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote
 *    products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF
 * WHICH ARE HEREBY DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
 * USE OF THIS SOFTWARE, EVEN IF NOT ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 * %End-Header%
 */

#ifdef _WIN32
#define _WIN32_WINNT 0x0500
#include <windows.h>
#define UUID MYUUID
#endif

#include <stdio.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <stdlib.h>
#include <sys/types.h>
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#include <time.h>

#include "uuidP.h"

time_t uuid_time(const uuid_t uu, struct timeval *ret_tv)
{
	struct timeval		tv;
	struct uuid		uuid;
	uint32_t		high;
	uint64_t		clock_reg;

	uuid_unpack(uu, &uuid);

	high = uuid.time_mid | ((uuid.time_hi_and_version & 0xFFF) << 16);
	clock_reg = uuid.time_low | ((uint64_t) high << 32);

	clock_reg -= (((uint64_t) 0x01B21DD2) << 32) + 0x13814000;
	tv.tv_sec = clock_reg / 10000000;
	tv.tv_usec = (clock_reg % 10000000) / 10;

	if (ret_tv)
		*ret_tv = tv;

	return tv.tv_sec;
}

int uuid_type(const uuid_t uu)
{
	struct uuid		uuid;

	uuid_unpack(uu, &uuid);
	return ((uuid.time_hi_and_version >> 12) & 0xF);
}

int uuid_variant(const uuid_t uu)
{
	struct uuid		uuid;
	int			var;

	uuid_unpack(uu, &uuid);
	var = uuid.clock_seq;

	if ((var & 0x8000) == 0)
		return UUID_VARIANT_NCS;
	if ((var & 0x4000) == 0)
		return UUID_VARIANT_DCE;
	if ((var & 0x2000) == 0)
		return UUID_VARIANT_MICROSOFT;
	return UUID_VARIANT_OTHER;
}

#ifdef DEBUG
static const char *variant_string(int variant)
{
	switch (variant) {
	case UUID_VARIANT_NCS:
		return "NCS";
	case UUID_VARIANT_DCE:
		return "DCE";
	case UUID_VARIANT_MICROSOFT:
		return "Microsoft";
	default:
		return "Other";
	}
}


int
main(int argc, char **argv)
{
	uuid_t		buf;
	time_t		time_reg;
	struct timeval	tv;
	int		type, variant;

	if (argc != 2) {
		fprintf(stderr, "Usage: %s uuid\n", argv[0]);
		exit(1);
	}
	if (uuid_parse(argv[1], buf)) {
		fprintf(stderr, "Invalid UUID: %s\n", argv[1]);
		exit(1);
	}
	variant = uuid_variant(buf);
	type = uuid_type(buf);
	time_reg = uuid_time(buf, &tv);

	printf("UUID variant is %d (%s)\n", variant, variant_string(variant));
	if (variant != UUID_VARIANT_DCE) {
		printf("Warning: This program only knows how to interpret "
		       "DCE UUIDs.\n\tThe rest of the output is likely "
		       "to be incorrect!!\n");
	}
	printf("UUID type is %d", type);
	switch (type) {
	case 1:
		printf(" (time based)\n");
		break;
	case 2:
		printf(" (DCE)\n");
		break;
	case 3:
		printf(" (name-based)\n");
		break;
	case 4:
		printf(" (random)\n");
		break;
	default:
		printf("\n");
	}
	if (type != 1) {
		printf("Warning: not a time-based UUID, so UUID time "
		       "decoding will likely not work!\n");
	}
	printf("UUID time is: (%ld, %ld): %s\n", tv.tv_sec, tv.tv_usec,
	       ctime(&time_reg));

	return 0;
}
#endif