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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 
uuid_time(const uuid_t uu,struct timeval * ret_tv)58 time_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 
uuid_type(const uuid_t uu)80 int 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 
uuid_variant(const uuid_t uu)88 int 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
variant_string(int variant)106 static 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 
121 int
main(int argc,char ** argv)122 main(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, (long)tv.tv_usec,
169 	       ctime(&time_reg));
170 
171 	return 0;
172 }
173 #endif
174