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