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 UUID_DEFINE(UUID_NULL, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
  46
  47 static void
  48 read_node(uint8_t *node)
  49 {
  50 #if NETWORKING
  51         if (uuid_get_ethernet(node) == 0)
  52                 return;
  53 #endif /* NETWORKING */
  54
  55         read_random(node, 6);
  56         node[0] |= 0x01;
  57 }
  58
  59 static uint64_t
  60 read_time(void)
  61 {
  62         struct timespec tv;
  63
  64         nanotime(&tv);
  65
  66         return (tv.tv_sec * 10000000ULL) + (tv.tv_nsec / 100ULL) + 0x01B21DD213814000ULL;
  67 }
  68
  69 void
  70 uuid_clear(uuid_t uu)
  71 {
  72         memset(uu, 0, sizeof(uuid_t));
  73 }
  74
  75 int
  76 uuid_compare(const uuid_t uu1, const uuid_t uu2)
  77 {
  78         return memcmp(uu1, uu2, sizeof(uuid_t));
  79 }
  80
  81 void
  82 uuid_copy(uuid_t dst, const uuid_t src)
  83 {
  84         memcpy(dst, src, sizeof(uuid_t));
  85 }
  86
  87 void
  88 uuid_generate_random(uuid_t out)
  89 {
  90         read_random(out, sizeof(uuid_t));
  91
  92         out[6] = (out[6] & 0x0F) | 0x40;
  93         out[8] = (out[8] & 0x3F) | 0x80;
  94 }
  95
  96 void
  97 uuid_generate_time(uuid_t out)
  98 {
  99         uint64_t time;
 100
 101         read_node(&out[10]);
 102         read_random(&out[8], 2);
 103
 104         time = read_time();
 105         out[0] = (uint8_t)(time >> 24);
 106         out[1] = (uint8_t)(time >> 16);
 107         out[2] = (uint8_t)(time >> 8);
 108         out[3] = (uint8_t)time;
 109         out[4] = (uint8_t)(time >> 40);
 110         out[5] = (uint8_t)(time >> 32);
 111         out[6] = (uint8_t)(time >> 56);
 112         out[7] = (uint8_t)(time >> 48);
 113
 114         out[6] = (out[6] & 0x0F) | 0x10;
 115         out[8] = (out[8] & 0x3F) | 0x80;
 116 }
 117
 118 void
 119 uuid_generate(uuid_t out)
 120 {
 121         uuid_generate_random(out);
 122 }
 123
 124 int
 125 uuid_is_null(const uuid_t uu)
 126 {
 127         return !memcmp(uu, UUID_NULL, sizeof(uuid_t));
 128 }
 129
 130 int
 131 uuid_parse(const uuid_string_t in, uuid_t uu)
 132 {
 133         int n = 0;
 134
 135         sscanf(in,
 136                 "%2hhx%2hhx%2hhx%2hhx-"
 137                 "%2hhx%2hhx-"
 138                 "%2hhx%2hhx-"
 139                 "%2hhx%2hhx-"
 140                 "%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx%n",
 141                 &uu[0], &uu[1], &uu[2], &uu[3],
 142                 &uu[4], &uu[5],
 143                 &uu[6], &uu[7],
 144                 &uu[8], &uu[9],
 145                 &uu[10], &uu[11], &uu[12], &uu[13], &uu[14], &uu[15], &n);
 146
 147         return (n != 36 || in[n] != '\0' ? -1 : 0);
 148 }
 149
 150 void
 151 uuid_unparse_lower(const uuid_t uu, uuid_string_t out)
 152 {
 153         snprintf(out,
 154                 sizeof(uuid_string_t),
 155                 "%02x%02x%02x%02x-"
 156                 "%02x%02x-"
 157                 "%02x%02x-"
 158                 "%02x%02x-"
 159                 "%02x%02x%02x%02x%02x%02x",
 160                 uu[0], uu[1], uu[2], uu[3],
 161                 uu[4], uu[5],
 162                 uu[6], uu[7],
 163                 uu[8], uu[9],
 164                 uu[10], uu[11], uu[12], uu[13], uu[14], uu[15]);
 165 }
 166
 167 void
 168 uuid_unparse_upper(const uuid_t uu, uuid_string_t out)
 169 {
 170         snprintf(out,
 171                 sizeof(uuid_string_t),
 172                 "%02X%02X%02X%02X-"
 173                 "%02X%02X-"
 174                 "%02X%02X-"
 175                 "%02X%02X-"
 176                 "%02X%02X%02X%02X%02X%02X",
 177                 uu[0], uu[1], uu[2], uu[3],
 178                 uu[4], uu[5],
 179                 uu[6], uu[7],
 180                 uu[8], uu[9],
 181                 uu[10], uu[11], uu[12], uu[13], uu[14], uu[15]);
 182 }
 183
 184 void
 185 uuid_unparse(const uuid_t uu, uuid_string_t out)
 186 {
 187         uuid_unparse_upper(uu, out);
 188 }