uuid_time.c revision d1154eb460efe588eaed3d439c1caaca149fa362 
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 "config.h"
38
39#ifdef _WIN32
40#define _WIN32_WINNT 0x0500
41#include <windows.h>
42#define UUID MYUUID
43#endif
44
45#include <stdio.h>
46#ifdef HAVE_UNISTD_H
47#include <unistd.h>
48#endif
49#include <stdlib.h>
50#include <sys/types.h>
51#ifdef HAVE_SYS_TIME_H
52#include <sys/time.h>
53#endif
54#include <time.h>
55
56#include "uuidP.h"
57
58time_t uuid_time(const uuid_t uu, struct timeval *ret_tv)
59{
60	struct timeval		tv;
61	struct uuid		uuid;
62	uint32_t		high;
63	uint64_t		clock_reg;
64
65	uuid_unpack(uu, &uuid);
66
67	high = uuid.time_mid | ((uuid.time_hi_and_version & 0xFFF) << 16);
68	clock_reg = uuid.time_low | ((uint64_t) high << 32);
69
70	clock_reg -= (((uint64_t) 0x01B21DD2) << 32) + 0x13814000;
71	tv.tv_sec = clock_reg / 10000000;
72	tv.tv_usec = (clock_reg % 10000000) / 10;
73
74	if (ret_tv)
75		*ret_tv = tv;
76
77	return tv.tv_sec;
78}
79
80int uuid_type(const uuid_t uu)
81{
82	struct uuid		uuid;
83
84	uuid_unpack(uu, &uuid);
85	return ((uuid.time_hi_and_version >> 12) & 0xF);
86}
87
88int uuid_variant(const uuid_t uu)
89{
90	struct uuid		uuid;
91	int			var;
92
93	uuid_unpack(uu, &uuid);
94	var = uuid.clock_seq;
95
96	if ((var & 0x8000) == 0)
97		return UUID_VARIANT_NCS;
98	if ((var & 0x4000) == 0)
99		return UUID_VARIANT_DCE;
100	if ((var & 0x2000) == 0)
101		return UUID_VARIANT_MICROSOFT;
102	return UUID_VARIANT_OTHER;
103}
104
105#ifdef DEBUG
106static const char *variant_string(int variant)
107{
108	switch (variant) {
109	case UUID_VARIANT_NCS:
110		return "NCS";
111	case UUID_VARIANT_DCE:
112		return "DCE";
113	case UUID_VARIANT_MICROSOFT:
114		return "Microsoft";
115	default:
116		return "Other";
117	}
118}
119
120
121int
122main(int argc, char **argv)
123{
124	uuid_t		buf;
125	time_t		time_reg;
126	struct timeval	tv;
127	int		type, variant;
128
129	if (argc != 2) {
130		fprintf(stderr, "Usage: %s uuid\n", argv[0]);
131		exit(1);
132	}
133	if (uuid_parse(argv[1], buf)) {
134		fprintf(stderr, "Invalid UUID: %s\n", argv[1]);
135		exit(1);
136	}
137	variant = uuid_variant(buf);
138	type = uuid_type(buf);
139	time_reg = uuid_time(buf, &tv);
140
141	printf("UUID variant is %d (%s)\n", variant, variant_string(variant));
142	if (variant != UUID_VARIANT_DCE) {
143		printf("Warning: This program only knows how to interpret "
144		       "DCE UUIDs.\n\tThe rest of the output is likely "
145		       "to be incorrect!!\n");
146	}
147	printf("UUID type is %d", type);
148	switch (type) {
149	case 1:
150		printf(" (time based)\n");
151		break;
152	case 2:
153		printf(" (DCE)\n");
154		break;
155	case 3:
156		printf(" (name-based)\n");
157		break;
158	case 4:
159		printf(" (random)\n");
160		break;
161	default:
162		printf("\n");
163	}
164	if (type != 1) {
165		printf("Warning: not a time-based UUID, so UUID time "
166		       "decoding will likely not work!\n");
167	}
168	printf("UUID time is: (%ld, %ld): %s\n", tv.tv_sec, tv.tv_usec,
169	       ctime(&time_reg));
170
171	return 0;
172}
173#endif
174