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
uuid_time(const uuid_t uu,struct timeval * ret_tv)56 time_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
uuid_type(const uuid_t uu)78 int 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
uuid_variant(const uuid_t uu)86 int 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
variant_string(int variant)104 static 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
119 int
main(int argc,char ** argv)120 main(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, tv.tv_usec,
167 ctime(&time_reg));
168
169 return 0;
170 }
171 #endif
172