[3320] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * uuid_time.c --- Interpret the time field from a uuid. This program
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| 4 | * violates the UUID abstraction barrier by reaching into the guts
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| 5 | * of a UUID and interpreting it.
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| 6 | *
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| 7 | * Copyright (C) 1998, 1999 Theodore Ts'o.
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| 8 | *
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| 9 | * %Begin-Header%
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| 10 | * Redistribution and use in source and binary forms, with or without
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| 11 | * modification, are permitted provided that the following conditions
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| 12 | * are met:
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| 13 | * 1. Redistributions of source code must retain the above copyright
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| 14 | * notice, and the entire permission notice in its entirety,
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| 15 | * including the disclaimer of warranties.
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| 16 | * 2. Redistributions in binary form must reproduce the above copyright
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| 17 | * notice, this list of conditions and the following disclaimer in the
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| 18 | * documentation and/or other materials provided with the distribution.
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| 19 | * 3. The name of the author may not be used to endorse or promote
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| 20 | * products derived from this software without specific prior
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| 21 | * written permission.
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| 22 | *
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| 23 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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| 24 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 25 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF
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| 26 | * WHICH ARE HEREBY DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
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| 27 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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| 28 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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| 29 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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| 30 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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| 31 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 32 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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| 33 | * USE OF THIS SOFTWARE, EVEN IF NOT ADVISED OF THE POSSIBILITY OF SUCH
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| 34 | * DAMAGE.
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| 35 | * %End-Header%
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| 36 | */
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| 37 |
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| 38 | #include <stdio.h>
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| 39 | #include <unistd.h>
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| 40 | #include <stdlib.h>
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| 41 | #include <sys/types.h>
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| 42 | #include <time.h>
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| 43 |
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| 44 | #include "uuidP.h"
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| 45 |
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| 46 | time_t uuid_time(const uuid_t uu, struct timeval *ret_tv)
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| 47 | {
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| 48 | struct uuid uuid;
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| 49 | uint32_t high;
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| 50 | struct timeval tv;
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| 51 | unsigned long long clock_reg;
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| 52 |
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| 53 | uuid_unpack(uu, &uuid);
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| 54 |
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| 55 | high = uuid.time_mid | ((uuid.time_hi_and_version & 0xFFF) << 16);
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| 56 | clock_reg = uuid.time_low | ((unsigned long long) high << 32);
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| 57 |
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| 58 | clock_reg -= (((unsigned long long) 0x01B21DD2) << 32) + 0x13814000;
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| 59 | tv.tv_sec = clock_reg / 10000000;
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| 60 | tv.tv_usec = (clock_reg % 10000000) / 10;
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| 61 |
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| 62 | if (ret_tv)
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| 63 | *ret_tv = tv;
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| 64 |
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| 65 | return tv.tv_sec;
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| 66 | }
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| 67 |
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| 68 | int uuid_type(const uuid_t uu)
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| 69 | {
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| 70 | struct uuid uuid;
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| 71 |
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| 72 | uuid_unpack(uu, &uuid);
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| 73 | return ((uuid.time_hi_and_version >> 12) & 0xF);
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| 74 | }
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| 75 |
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| 76 | int uuid_variant(const uuid_t uu)
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| 77 | {
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| 78 | struct uuid uuid;
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| 79 | int var;
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| 80 |
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| 81 | uuid_unpack(uu, &uuid);
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| 82 | var = uuid.clock_seq;
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| 83 |
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| 84 | if ((var & 0x8000) == 0)
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| 85 | return UUID_VARIANT_NCS;
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| 86 | if ((var & 0x4000) == 0)
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| 87 | return UUID_VARIANT_DCE;
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| 88 | if ((var & 0x2000) == 0)
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| 89 | return UUID_VARIANT_MICROSOFT;
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| 90 | return UUID_VARIANT_OTHER;
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| 91 | }
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| 92 |
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| 93 | #ifdef DEBUG
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| 94 | static const char *variant_string(int variant)
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| 95 | {
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| 96 | switch (variant) {
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| 97 | case UUID_VARIANT_NCS:
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| 98 | return "NCS";
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| 99 | case UUID_VARIANT_DCE:
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| 100 | return "DCE";
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| 101 | case UUID_VARIANT_MICROSOFT:
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| 102 | return "Microsoft";
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| 103 | default:
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| 104 | return "Other";
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| 105 | }
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| 106 | }
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| 107 |
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| 108 |
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| 109 | int
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| 110 | main(int argc, char **argv)
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| 111 | {
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| 112 | uuid_t buf;
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| 113 | time_t time_reg;
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| 114 | struct timeval tv;
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| 115 | int type, variant;
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| 116 |
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| 117 | if (argc != 2) {
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| 118 | fprintf(stderr, "Usage: %s uuid\n", argv[0]);
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| 119 | exit(1);
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| 120 | }
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| 121 | if (uuid_parse(argv[1], buf)) {
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| 122 | fprintf(stderr, "Invalid UUID: %s\n", argv[1]);
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| 123 | exit(1);
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| 124 | }
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| 125 | variant = uuid_variant(buf);
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| 126 | type = uuid_type(buf);
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| 127 | time_reg = uuid_time(buf, &tv);
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| 128 |
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| 129 | printf("UUID variant is %d (%s)\n", variant, variant_string(variant));
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| 130 | if (variant != UUID_VARIANT_DCE) {
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| 131 | printf("Warning: This program only knows how to interpret "
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| 132 | "DCE UUIDs.\n\tThe rest of the output is likely "
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| 133 | "to be incorrect!!\n");
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| 134 | }
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| 135 | printf("UUID type is %d", type);
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| 136 | switch (type) {
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| 137 | case 1:
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| 138 | printf(" (time based)\n");
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| 139 | break;
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| 140 | case 2:
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| 141 | printf(" (DCE)\n");
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| 142 | break;
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| 143 | case 3:
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| 144 | printf(" (name-based)\n");
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| 145 | break;
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| 146 | case 4:
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| 147 | printf(" (random)\n");
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| 148 | break;
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| 149 | default:
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| 150 | bb_putchar('\n');
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| 151 | }
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| 152 | if (type != 1) {
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| 153 | printf("Warning: not a time-based UUID, so UUID time "
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| 154 | "decoding will likely not work!\n");
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| 155 | }
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| 156 | printf("UUID time is: (%ld, %ld): %s\n", tv.tv_sec, tv.tv_usec,
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| 157 | ctime(&time_reg));
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| 158 |
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| 159 | return 0;
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| 160 | }
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| 161 | #endif
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