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 "config.h" 38 39 #ifdef _WIN32 40 #define _WIN32_WINNT 0x0500 41 #include <windows.h> 42 #define UUID MYUUID 43 #endif 44 45 #include <stdio.h> 46 #ifdef HAVE_UNISTD_H 47 #include <unistd.h> 48 #endif 49 #include <stdlib.h> 50 #include <sys/types.h> 51 #ifdef HAVE_SYS_TIME_H 52 #include <sys/time.h> 53 #endif 54 #include <time.h> 55 56 #include "uuidP.h" 57 58 time_t uuid_time(const uuid_t uu, struct timeval *ret_tv) 59 { 60 struct timeval tv; 61 struct uuid uuid; 62 uint32_t high; 63 uint64_t clock_reg; 64 65 uuid_unpack(uu, &uuid); 66 67 high = uuid.time_mid | ((uuid.time_hi_and_version & 0xFFF) << 16); 68 clock_reg = uuid.time_low | ((uint64_t) high << 32); 69 70 clock_reg -= (((uint64_t) 0x01B21DD2) << 32) + 0x13814000; 71 tv.tv_sec = clock_reg / 10000000; 72 tv.tv_usec = (clock_reg % 10000000) / 10; 73 74 if (ret_tv) 75 *ret_tv = tv; 76 77 return tv.tv_sec; 78 } 79 80 int uuid_type(const uuid_t uu) 81 { 82 struct uuid uuid; 83 84 uuid_unpack(uu, &uuid); 85 return ((uuid.time_hi_and_version >> 12) & 0xF); 86 } 87 88 int uuid_variant(const uuid_t uu) 89 { 90 struct uuid uuid; 91 int var; 92 93 uuid_unpack(uu, &uuid); 94 var = uuid.clock_seq; 95 96 if ((var & 0x8000) == 0) 97 return UUID_VARIANT_NCS; 98 if ((var & 0x4000) == 0) 99 return UUID_VARIANT_DCE; 100 if ((var & 0x2000) == 0) 101 return UUID_VARIANT_MICROSOFT; 102 return UUID_VARIANT_OTHER; 103 } 104 105 #ifdef DEBUG 106 static const char *variant_string(int variant) 107 { 108 switch (variant) { 109 case UUID_VARIANT_NCS: 110 return "NCS"; 111 case UUID_VARIANT_DCE: 112 return "DCE"; 113 case UUID_VARIANT_MICROSOFT: 114 return "Microsoft"; 115 default: 116 return "Other"; 117 } 118 } 119 120 121 int 122 main(int argc, char **argv) 123 { 124 uuid_t buf; 125 time_t time_reg; 126 struct timeval tv; 127 int type, variant; 128 129 if (argc != 2) { 130 fprintf(stderr, "Usage: %s uuid\n", argv[0]); 131 exit(1); 132 } 133 if (uuid_parse(argv[1], buf)) { 134 fprintf(stderr, "Invalid UUID: %s\n", argv[1]); 135 exit(1); 136 } 137 variant = uuid_variant(buf); 138 type = uuid_type(buf); 139 time_reg = uuid_time(buf, &tv); 140 141 printf("UUID variant is %d (%s)\n", variant, variant_string(variant)); 142 if (variant != UUID_VARIANT_DCE) { 143 printf("Warning: This program only knows how to interpret " 144 "DCE UUIDs.\n\tThe rest of the output is likely " 145 "to be incorrect!!\n"); 146 } 147 printf("UUID type is %d", type); 148 switch (type) { 149 case 1: 150 printf(" (time based)\n"); 151 break; 152 case 2: 153 printf(" (DCE)\n"); 154 break; 155 case 3: 156 printf(" (name-based)\n"); 157 break; 158 case 4: 159 printf(" (random)\n"); 160 break; 161 default: 162 printf("\n"); 163 } 164 if (type != 1) { 165 printf("Warning: not a time-based UUID, so UUID time " 166 "decoding will likely not work!\n"); 167 } 168 printf("UUID time is: (%ld, %ld): %s\n", tv.tv_sec, (long)tv.tv_usec, 169 ctime(&time_reg)); 170 171 return 0; 172 } 173 #endif