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