libkern/uuid/uuid.c

   1 /*
   2  * Copyright (c) 2004-2011 Apple Inc. All rights reserved.
   3  *
   4  * %Begin-Header%
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, and the entire permission notice in its entirety,
  10  *    including the disclaimer of warranties.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. The name of the author may not be used to endorse or promote
  15  *    products derived from this software without specific prior
  16  *    written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  19  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF
  21  * WHICH ARE HEREBY DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE
  22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
  24  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  25  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  26  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
  28  * USE OF THIS SOFTWARE, EVEN IF NOT ADVISED OF THE POSSIBILITY OF SUCH
  29  * DAMAGE.
  30  * %End-Header%
  31  */
  32
  33 #include <uuid/uuid.h>
  34
  35 #include <stdint.h>
  36 #include <string.h>
  37
  38 #include <sys/random.h>
  39 #include <sys/socket.h>
  40 #include <sys/systm.h>
  41 #include <sys/time.h>
  42
  43 extern int uuid_get_ethernet(u_int8_t *);
  44
  45 static void
  46 read_node(uint8_t *node)
  47 {
  48 #if NETWORKING
  49         if (uuid_get_ethernet(node) == 0)
  50                 return;
  51 #endif /* NETWORKING */
  52
  53         read_random(node, 6);
  54         node[0] |= 0x01;
  55 }
  56
  57 static uint64_t
  58 read_time(void)
  59 {
  60         struct timespec tv;
  61
  62         nanotime(&tv);
  63
  64         return (tv.tv_sec * 10000000ULL) + (tv.tv_nsec / 100ULL) + 0x01B21DD213814000ULL;
  65 }
  66
  67 void
  68 uuid_clear(uuid_t uu)
  69 {
  70         memset(uu, 0, sizeof(uuid_t));
  71 }
  72
  73 int
  74 uuid_compare(const uuid_t uu1, const uuid_t uu2)
  75 {
  76         return memcmp(uu1, uu2, sizeof(uuid_t));
  77 }
  78
  79 void
  80 uuid_copy(uuid_t dst, const uuid_t src)
  81 {
  82         memcpy(dst, src, sizeof(uuid_t));
  83 }
  84
  85 static void
  86 uuid_random_setflags(uuid_t out)
  87 {
  88         out[6] = (out[6] & 0x0F) | 0x40;
  89         out[8] = (out[8] & 0x3F) | 0x80;
  90 }
  91
  92 void
  93 uuid_generate_random(uuid_t out)
  94 {
  95         read_random(out, sizeof(uuid_t));
  96         uuid_random_setflags(out);
  97 }
  98
  99 void
 100 uuid_generate_early_random(uuid_t out)
 101 {
 102         read_frandom(out, sizeof(uuid_t));
 103         uuid_random_setflags(out);
 104 }
 105
 106 void
 107 uuid_generate_time(uuid_t out)
 108 {
 109         uint64_t time;
 110
 111         read_node(&out[10]);
 112         read_random(&out[8], 2);
 113
 114         time = read_time();
 115         out[0] = (uint8_t)(time >> 24);
 116         out[1] = (uint8_t)(time >> 16);
 117         out[2] = (uint8_t)(time >> 8);
 118         out[3] = (uint8_t)time;
 119         out[4] = (uint8_t)(time >> 40);
 120         out[5] = (uint8_t)(time >> 32);
 121         out[6] = (uint8_t)(time >> 56);
 122         out[7] = (uint8_t)(time >> 48);
 123
 124         out[6] = (out[6] & 0x0F) | 0x10;
 125         out[8] = (out[8] & 0x3F) | 0x80;
 126 }
 127
 128 void
 129 uuid_generate(uuid_t out)
 130 {
 131         uuid_generate_random(out);
 132 }
 133
 134 int
 135 uuid_is_null(const uuid_t uu)
 136 {
 137         return !memcmp(uu, UUID_NULL, sizeof(uuid_t));
 138 }
 139
 140 int
 141 uuid_parse(const uuid_string_t in, uuid_t uu)
 142 {
 143         int n = 0;
 144
 145         sscanf(in,
 146                 "%2hhx%2hhx%2hhx%2hhx-"
 147                 "%2hhx%2hhx-"
 148                 "%2hhx%2hhx-"
 149                 "%2hhx%2hhx-"
 150                 "%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx%n",
 151                 &uu[0], &uu[1], &uu[2], &uu[3],
 152                 &uu[4], &uu[5],
 153                 &uu[6], &uu[7],
 154                 &uu[8], &uu[9],
 155                 &uu[10], &uu[11], &uu[12], &uu[13], &uu[14], &uu[15], &n);
 156
 157         return (n != 36 || in[n] != '\0' ? -1 : 0);
 158 }
 159
 160 void
 161 uuid_unparse_lower(const uuid_t uu, uuid_string_t out)
 162 {
 163         snprintf(out,
 164                 sizeof(uuid_string_t),
 165                 "%02x%02x%02x%02x-"
 166                 "%02x%02x-"
 167                 "%02x%02x-"
 168                 "%02x%02x-"
 169                 "%02x%02x%02x%02x%02x%02x",
 170                 uu[0], uu[1], uu[2], uu[3],
 171                 uu[4], uu[5],
 172                 uu[6], uu[7],
 173                 uu[8], uu[9],
 174                 uu[10], uu[11], uu[12], uu[13], uu[14], uu[15]);
 175 }
 176
 177 void
 178 uuid_unparse_upper(const uuid_t uu, uuid_string_t out)
 179 {
 180         snprintf(out,
 181                 sizeof(uuid_string_t),
 182                 "%02X%02X%02X%02X-"
 183                 "%02X%02X-"
 184                 "%02X%02X-"
 185                 "%02X%02X-"
 186                 "%02X%02X%02X%02X%02X%02X",
 187                 uu[0], uu[1], uu[2], uu[3],
 188                 uu[4], uu[5],
 189                 uu[6], uu[7],
 190                 uu[8], uu[9],
 191                 uu[10], uu[11], uu[12], uu[13], uu[14], uu[15]);
 192 }
 193
 194 void
 195 uuid_unparse(const uuid_t uu, uuid_string_t out)
 196 {
 197         uuid_unparse_upper(uu, out);
 198 }