src/libs/uuid/uuid_time.c

   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
  46 time_t uuid_time(const uuid_t uu, struct timeval *ret_tv)
  47 {
  48         struct timeval          tv;
  49         struct uuid             uuid;
  50         uint32_t                high;
  51         uint64_t                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 | ((uint64_t) high << 32);
  57
  58         clock_reg -= (((uint64_t) 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
  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
  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
  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
 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, (long)tv.tv_usec,
 157                ctime(&time_reg));
 158
 159         return 0;
 160 }
 161 #endif