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.
6 * Copyright (C) 1998, 1999 Theodore Ts'o.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
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
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
40 #include <sys/types.h>
45 time_t uuid_time(const uuid_t uu, struct timeval *ret_tv)
50 unsigned long long clock_reg;
52 uuid_unpack(uu, &uuid);
54 high = uuid.time_mid | ((uuid.time_hi_and_version & 0xFFF) << 16);
55 clock_reg = uuid.time_low | ((unsigned long long) high << 32);
57 clock_reg -= (((unsigned long long) 0x01B21DD2) << 32) + 0x13814000;
58 tv.tv_sec = clock_reg / 10000000;
59 tv.tv_usec = (clock_reg % 10000000) / 10;
67 int uuid_type(const uuid_t uu)
71 uuid_unpack(uu, &uuid);
72 return ((uuid.time_hi_and_version >> 12) & 0xF);
75 int uuid_variant(const uuid_t uu)
80 uuid_unpack(uu, &uuid);
83 if ((var & 0x8000) == 0)
84 return UUID_VARIANT_NCS;
85 if ((var & 0x4000) == 0)
86 return UUID_VARIANT_DCE;
87 if ((var & 0x2000) == 0)
88 return UUID_VARIANT_MICROSOFT;
89 return UUID_VARIANT_OTHER;
93 static const char *variant_string(int variant)
96 case UUID_VARIANT_NCS:
98 case UUID_VARIANT_DCE:
100 case UUID_VARIANT_MICROSOFT:
109 main(int argc, char **argv)
117 fprintf(stderr, "Usage: %s uuid\n", argv[0]);
120 if (uuid_parse(argv[1], buf)) {
121 fprintf(stderr, "Invalid UUID: %s\n", argv[1]);
124 variant = uuid_variant(buf);
125 type = uuid_type(buf);
126 time_reg = uuid_time(buf, &tv);
128 printf("UUID variant is %d (%s)\n", variant, variant_string(variant));
129 if (variant != UUID_VARIANT_DCE) {
130 printf("Warning: This program only knows how to interpret "
131 "DCE UUIDs.\n\tThe rest of the output is likely "
132 "to be incorrect!!\n");
134 printf("UUID type is %d", type);
137 printf(" (time based)\n");
143 printf(" (name-based)\n");
146 printf(" (random)\n");
152 printf("Warning: not a time-based UUID, so UUID time "
153 "decoding will likely not work!\n");
155 printf("UUID time is: (%ld, %ld): %s\n", tv.tv_sec, tv.tv_usec,