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         }
  52 #endif /* NETWORKING */
  53
  54         read_random(node, 6);
  55         node[0] |= 0x01;
  56 }
  57
  58 static uint64_t
  59 read_time(void)
  60 {
  61         struct timespec tv;
  62
  63         nanotime(&tv);
  64
  65         return (tv.tv_sec * 10000000ULL) + (tv.tv_nsec / 100ULL) + 0x01B21DD213814000ULL;
  66 }
  67
  68 void
  69 uuid_clear(uuid_t uu)
  70 {
  71         memset(uu, 0, sizeof(uuid_t));
  72 }
  73
  74 int
  75 uuid_compare(const uuid_t uu1, const uuid_t uu2)
  76 {
  77         return memcmp(uu1, uu2, sizeof(uuid_t));
  78 }
  79
  80 void
  81 uuid_copy(uuid_t dst, const uuid_t src)
  82 {
  83         memcpy(dst, src, sizeof(uuid_t));
  84 }
  85
  86 static void
  87 uuid_random_setflags(uuid_t out)
  88 {
  89         out[6] = (out[6] & 0x0F) | 0x40;
  90         out[8] = (out[8] & 0x3F) | 0x80;
  91 }
  92
  93 void
  94 uuid_generate_random(uuid_t out)
  95 {
  96         read_random(out, sizeof(uuid_t));
  97         uuid_random_setflags(out);
  98 }
  99
 100 void
 101 uuid_generate_early_random(uuid_t out)
 102 {
 103         read_frandom(out, sizeof(uuid_t));
 104         uuid_random_setflags(out);
 105 }
 106
 107 void
 108 uuid_generate_time(uuid_t out)
 109 {
 110         uint64_t time;
 111
 112         read_node(&out[10]);
 113         read_random(&out[8], 2);
 114
 115         time = read_time();
 116         out[0] = (uint8_t)(time >> 24);
 117         out[1] = (uint8_t)(time >> 16);
 118         out[2] = (uint8_t)(time >> 8);
 119         out[3] = (uint8_t)time;
 120         out[4] = (uint8_t)(time >> 40);
 121         out[5] = (uint8_t)(time >> 32);
 122         out[6] = (uint8_t)(time >> 56);
 123         out[7] = (uint8_t)(time >> 48);
 124
 125         out[6] = (out[6] & 0x0F) | 0x10;
 126         out[8] = (out[8] & 0x3F) | 0x80;
 127 }
 128
 129 void
 130 uuid_generate(uuid_t out)
 131 {
 132         uuid_generate_random(out);
 133 }
 134
 135 int
 136 uuid_is_null(const uuid_t uu)
 137 {
 138         return !memcmp(uu, UUID_NULL, sizeof(uuid_t));
 139 }
 140
 141 int
 142 uuid_parse(const uuid_string_t in, uuid_t uu)
 143 {
 144         int n = 0;
 145
 146         sscanf(in,
 147             "%2hhx%2hhx%2hhx%2hhx-"
 148             "%2hhx%2hhx-"
 149             "%2hhx%2hhx-"
 150             "%2hhx%2hhx-"
 151             "%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx%n",
 152             &uu[0], &uu[1], &uu[2], &uu[3],
 153             &uu[4], &uu[5],
 154             &uu[6], &uu[7],
 155             &uu[8], &uu[9],
 156             &uu[10], &uu[11], &uu[12], &uu[13], &uu[14], &uu[15], &n);
 157
 158         return n != 36 || in[n] != '\0' ? -1 : 0;
 159 }
 160
 161 void
 162 uuid_unparse_lower(const uuid_t uu, uuid_string_t out)
 163 {
 164         snprintf(out,
 165             sizeof(uuid_string_t),
 166             "%02x%02x%02x%02x-"
 167             "%02x%02x-"
 168             "%02x%02x-"
 169             "%02x%02x-"
 170             "%02x%02x%02x%02x%02x%02x",
 171             uu[0], uu[1], uu[2], uu[3],
 172             uu[4], uu[5],
 173             uu[6], uu[7],
 174             uu[8], uu[9],
 175             uu[10], uu[11], uu[12], uu[13], uu[14], uu[15]);
 176 }
 177
 178 void
 179 uuid_unparse_upper(const uuid_t uu, uuid_string_t out)
 180 {
 181         snprintf(out,
 182             sizeof(uuid_string_t),
 183             "%02X%02X%02X%02X-"
 184             "%02X%02X-"
 185             "%02X%02X-"
 186             "%02X%02X-"
 187             "%02X%02X%02X%02X%02X%02X",
 188             uu[0], uu[1], uu[2], uu[3],
 189             uu[4], uu[5],
 190             uu[6], uu[7],
 191             uu[8], uu[9],
 192             uu[10], uu[11], uu[12], uu[13], uu[14], uu[15]);
 193 }
 194
 195 void
 196 uuid_unparse(const uuid_t uu, uuid_string_t out)
 197 {
 198         uuid_unparse_upper(uu, out);
 199 }