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 | puts("");
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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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