1 /* vi: set sw=4 ts=4: */
3 * uuid_time.c --- Interpret the time field from a uuid. This program
4 * violates the UUID abstraction barrier by reaching into the guts
5 * of a UUID and interpreting it.
7 * Copyright (C) 1998, 1999 Theodore Ts'o.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, and the entire permission notice in its entirety,
15 * including the disclaimer of warranties.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. The name of the author may not be used to endorse or promote
20 * products derived from this software without specific prior
23 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF
26 * WHICH ARE HEREBY DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
27 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
29 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
33 * USE OF THIS SOFTWARE, EVEN IF NOT ADVISED OF THE POSSIBILITY OF SUCH
41 #include <sys/types.h>
46 time_t uuid_time(const uuid_t uu, struct timeval *ret_tv)
51 unsigned long long clock_reg;
53 uuid_unpack(uu, &uuid);
55 high = uuid.time_mid | ((uuid.time_hi_and_version & 0xFFF) << 16);
56 clock_reg = uuid.time_low | ((unsigned long long) high << 32);
58 clock_reg -= (((unsigned long long) 0x01B21DD2) << 32) + 0x13814000;
59 tv.tv_sec = clock_reg / 10000000;
60 tv.tv_usec = (clock_reg % 10000000) / 10;
68 int uuid_type(const uuid_t uu)
72 uuid_unpack(uu, &uuid);
73 return ((uuid.time_hi_and_version >> 12) & 0xF);
76 int uuid_variant(const uuid_t uu)
81 uuid_unpack(uu, &uuid);
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;
94 static const char *variant_string(int variant)
97 case UUID_VARIANT_NCS:
99 case UUID_VARIANT_DCE:
101 case UUID_VARIANT_MICROSOFT:
110 main(int argc, char **argv)
118 fprintf(stderr, "Usage: %s uuid\n", argv[0]);
121 if (uuid_parse(argv[1], buf)) {
122 fprintf(stderr, "Invalid UUID: %s\n", argv[1]);
125 variant = uuid_variant(buf);
126 type = uuid_type(buf);
127 time_reg = uuid_time(buf, &tv);
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");
135 printf("UUID type is %d", type);
138 printf(" (time based)\n");
144 printf(" (name-based)\n");
147 printf(" (random)\n");
153 printf("Warning: not a time-based UUID, so UUID time "
154 "decoding will likely not work!\n");
156 printf("UUID time is: (%ld, %ld): %s\n", tv.tv_sec, tv.tv_usec,