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