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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 #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
    174