uuid_time.c revision 6ec9ef1881e636540cfe28e6f32c93e1781ad173
16ac915abcdb404a00d927fe6308a47fcf09d9519hkuang/* 26ac915abcdb404a00d927fe6308a47fcf09d9519hkuang * uuid_time.c --- Interpret the time field from a uuid. This program 36ac915abcdb404a00d927fe6308a47fcf09d9519hkuang * violates the UUID abstraction barrier by reaching into the guts 46ac915abcdb404a00d927fe6308a47fcf09d9519hkuang * of a UUID and interpreting it. 56ac915abcdb404a00d927fe6308a47fcf09d9519hkuang * 66ac915abcdb404a00d927fe6308a47fcf09d9519hkuang * Copyright (C) 1998, 1999 Theodore Ts'o. 76ac915abcdb404a00d927fe6308a47fcf09d9519hkuang * 86ac915abcdb404a00d927fe6308a47fcf09d9519hkuang * %Begin-Header% 96ac915abcdb404a00d927fe6308a47fcf09d9519hkuang * Redistribution and use in source and binary forms, with or without 106ac915abcdb404a00d927fe6308a47fcf09d9519hkuang * modification, are permitted provided that the following conditions 116ac915abcdb404a00d927fe6308a47fcf09d9519hkuang * are met: 126ac915abcdb404a00d927fe6308a47fcf09d9519hkuang * 1. Redistributions of source code must retain the above copyright 136ac915abcdb404a00d927fe6308a47fcf09d9519hkuang * notice, and the entire permission notice in its entirety, 146ac915abcdb404a00d927fe6308a47fcf09d9519hkuang * including the disclaimer of warranties. 156ac915abcdb404a00d927fe6308a47fcf09d9519hkuang * 2. Redistributions in binary form must reproduce the above copyright 166ac915abcdb404a00d927fe6308a47fcf09d9519hkuang * notice, this list of conditions and the following disclaimer in the 176ac915abcdb404a00d927fe6308a47fcf09d9519hkuang * documentation and/or other materials provided with the distribution. 186ac915abcdb404a00d927fe6308a47fcf09d9519hkuang * 3. The name of the author may not be used to endorse or promote 196ac915abcdb404a00d927fe6308a47fcf09d9519hkuang * products derived from this software without specific prior 206ac915abcdb404a00d927fe6308a47fcf09d9519hkuang * written permission. 216ac915abcdb404a00d927fe6308a47fcf09d9519hkuang * 226ac915abcdb404a00d927fe6308a47fcf09d9519hkuang * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 236ac915abcdb404a00d927fe6308a47fcf09d9519hkuang * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 246ac915abcdb404a00d927fe6308a47fcf09d9519hkuang * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF 256ac915abcdb404a00d927fe6308a47fcf09d9519hkuang * WHICH ARE HEREBY DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE 266ac915abcdb404a00d927fe6308a47fcf09d9519hkuang * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 276ac915abcdb404a00d927fe6308a47fcf09d9519hkuang * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 286ac915abcdb404a00d927fe6308a47fcf09d9519hkuang * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 296ac915abcdb404a00d927fe6308a47fcf09d9519hkuang * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 306ac915abcdb404a00d927fe6308a47fcf09d9519hkuang * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 316ac915abcdb404a00d927fe6308a47fcf09d9519hkuang * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE 326ac915abcdb404a00d927fe6308a47fcf09d9519hkuang * USE OF THIS SOFTWARE, EVEN IF NOT ADVISED OF THE POSSIBILITY OF SUCH 336ac915abcdb404a00d927fe6308a47fcf09d9519hkuang * DAMAGE. 346ac915abcdb404a00d927fe6308a47fcf09d9519hkuang * %End-Header% 356ac915abcdb404a00d927fe6308a47fcf09d9519hkuang */ 366ac915abcdb404a00d927fe6308a47fcf09d9519hkuang 376ac915abcdb404a00d927fe6308a47fcf09d9519hkuang#ifdef _WIN32 386ac915abcdb404a00d927fe6308a47fcf09d9519hkuang#define _WIN32_WINNT 0x0500 396ac915abcdb404a00d927fe6308a47fcf09d9519hkuang#include <windows.h> 406ac915abcdb404a00d927fe6308a47fcf09d9519hkuang#define UUID MYUUID 416ac915abcdb404a00d927fe6308a47fcf09d9519hkuang#endif 426ac915abcdb404a00d927fe6308a47fcf09d9519hkuang 436ac915abcdb404a00d927fe6308a47fcf09d9519hkuang#include <stdio.h> 446ac915abcdb404a00d927fe6308a47fcf09d9519hkuang#ifdef HAVE_UNISTD_H 456ac915abcdb404a00d927fe6308a47fcf09d9519hkuang#include <unistd.h> 466ac915abcdb404a00d927fe6308a47fcf09d9519hkuang#endif 476ac915abcdb404a00d927fe6308a47fcf09d9519hkuang#include <stdlib.h> 486ac915abcdb404a00d927fe6308a47fcf09d9519hkuang#include <sys/types.h> 496ac915abcdb404a00d927fe6308a47fcf09d9519hkuang#ifdef HAVE_SYS_TIME_H 506ac915abcdb404a00d927fe6308a47fcf09d9519hkuang#include <sys/time.h> 516ac915abcdb404a00d927fe6308a47fcf09d9519hkuang#endif 526ac915abcdb404a00d927fe6308a47fcf09d9519hkuang#include <time.h> 536ac915abcdb404a00d927fe6308a47fcf09d9519hkuang 546ac915abcdb404a00d927fe6308a47fcf09d9519hkuang#include "uuidP.h" 556ac915abcdb404a00d927fe6308a47fcf09d9519hkuang 566ac915abcdb404a00d927fe6308a47fcf09d9519hkuangtime_t uuid_time(const uuid_t uu, struct timeval *ret_tv) 576ac915abcdb404a00d927fe6308a47fcf09d9519hkuang{ 58 struct timeval tv; 59 struct uuid uuid; 60 uint32_t high; 61 uint64_t clock_reg; 62 63 uuid_unpack(uu, &uuid); 64 65 high = uuid.time_mid | ((uuid.time_hi_and_version & 0xFFF) << 16); 66 clock_reg = uuid.time_low | ((uint64_t) high << 32); 67 68 clock_reg -= (((uint64_t) 0x01B21DD2) << 32) + 0x13814000; 69 tv.tv_sec = clock_reg / 10000000; 70 tv.tv_usec = (clock_reg % 10000000) / 10; 71 72 if (ret_tv) 73 *ret_tv = tv; 74 75 return tv.tv_sec; 76} 77 78int uuid_type(const uuid_t uu) 79{ 80 struct uuid uuid; 81 82 uuid_unpack(uu, &uuid); 83 return ((uuid.time_hi_and_version >> 12) & 0xF); 84} 85 86int uuid_variant(const uuid_t uu) 87{ 88 struct uuid uuid; 89 int var; 90 91 uuid_unpack(uu, &uuid); 92 var = uuid.clock_seq; 93 94 if ((var & 0x8000) == 0) 95 return UUID_VARIANT_NCS; 96 if ((var & 0x4000) == 0) 97 return UUID_VARIANT_DCE; 98 if ((var & 0x2000) == 0) 99 return UUID_VARIANT_MICROSOFT; 100 return UUID_VARIANT_OTHER; 101} 102 103#ifdef DEBUG 104static const char *variant_string(int variant) 105{ 106 switch (variant) { 107 case UUID_VARIANT_NCS: 108 return "NCS"; 109 case UUID_VARIANT_DCE: 110 return "DCE"; 111 case UUID_VARIANT_MICROSOFT: 112 return "Microsoft"; 113 default: 114 return "Other"; 115 } 116} 117 118 119int 120main(int argc, char **argv) 121{ 122 uuid_t buf; 123 time_t time_reg; 124 struct timeval tv; 125 int type, variant; 126 127 if (argc != 2) { 128 fprintf(stderr, "Usage: %s uuid\n", argv[0]); 129 exit(1); 130 } 131 if (uuid_parse(argv[1], buf)) { 132 fprintf(stderr, "Invalid UUID: %s\n", argv[1]); 133 exit(1); 134 } 135 variant = uuid_variant(buf); 136 type = uuid_type(buf); 137 time_reg = uuid_time(buf, &tv); 138 139 printf("UUID variant is %d (%s)\n", variant, variant_string(variant)); 140 if (variant != UUID_VARIANT_DCE) { 141 printf("Warning: This program only knows how to interpret " 142 "DCE UUIDs.\n\tThe rest of the output is likely " 143 "to be incorrect!!\n"); 144 } 145 printf("UUID type is %d", type); 146 switch (type) { 147 case 1: 148 printf(" (time based)\n"); 149 break; 150 case 2: 151 printf(" (DCE)\n"); 152 break; 153 case 3: 154 printf(" (name-based)\n"); 155 break; 156 case 4: 157 printf(" (random)\n"); 158 break; 159 default: 160 printf("\n"); 161 } 162 if (type != 1) { 163 printf("Warning: not a time-based UUID, so UUID time " 164 "decoding will likely not work!\n"); 165 } 166 printf("UUID time is: (%ld, %ld): %s\n", tv.tv_sec, tv.tv_usec, 167 ctime(&time_reg)); 168 169 return 0; 170} 171#endif 172