LXR busybox/e2fsprogs/old_e2fsprogs/uuid/uuid

   1/* vi: set sw=4 ts=4: */
   2/*
   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.
   6 *
   7 * Copyright (C) 1998, 1999 Theodore Ts'o.
   8 *
   9 * %Begin-Header%
  10 * Redistribution and use in source and binary forms, with or without
  11 * modification, are permitted provided that the following conditions
  12 * are met:
  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
  21 *    written permission.
  22 *
  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
  34 * DAMAGE.
  35 * %End-Header%
  36 */
  37
  38#include <stdio.h>
  39#include <unistd.h>
  40#include <stdlib.h>
  41#include <sys/types.h>
  42#include <time.h>
  43
  44#include "uuidP.h"
  45
  46time_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
  68int 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
  76int 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
  94static 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
 109int
 110main(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                bb_putchar('\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