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      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 #ifdef _WIN32
     38 #define _WIN32_WINNT 0x0500
     39 #include <windows.h>
     40 #define UUID MYUUID
     41 #endif
     42 
     43 #include <stdio.h>
     44 #ifdef HAVE_UNISTD_H
     45 #include <unistd.h>
     46 #endif
     47 #include <stdlib.h>
     48 #include <sys/types.h>
     49 #ifdef HAVE_SYS_TIME_H
     50 #include <sys/time.h>
     51 #endif
     52 #include <time.h>
     53 
     54 #include "uuidP.h"
     55 
     56 time_t uuid_time(const uuid_t uu, struct timeval *ret_tv)
     57 {
     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 
     78 int 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 
     86 int 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
    104 static 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 
    119 int
    120 main(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, (long)tv.tv_usec,
    167 	       ctime(&time_reg));
    168 
    169 	return 0;
    170 }
    171 #endif
    172