libkern/uuid/uuid.c

   1 /*
   2  * Copyright (c) 2004 Apple Computer, 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 #include <net/if.h>
  44 #include <net/if_dl.h>
  45 #include <net/if_types.h>
  46
  47 UUID_DEFINE(UUID_NULL, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
  48
  49 static void
  50 read_node(uint8_t *node)
  51 {
  52         struct ifnet *ifp;
  53         struct ifaddr *ifa;
  54         struct sockaddr_dl *sdl;
  55
  56         ifnet_head_lock_shared();
  57         TAILQ_FOREACH(ifp, &ifnet_head, if_link) {
  58                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  59                         sdl = (struct sockaddr_dl *)ifa->ifa_addr;
  60                         if (sdl && sdl->sdl_family == AF_LINK && sdl->sdl_type == IFT_ETHER) {
  61                                 memcpy(node, LLADDR(sdl), 6);
  62                                 ifnet_head_done();
  63                                 return;
  64                         }
  65                 }
  66         }
  67         ifnet_head_done();
  68
  69         read_random(node, 6);
  70         node[0] |= 0x01;
  71 }
  72
  73 static uint64_t
  74 read_time(void)
  75 {
  76         struct timespec tv;
  77
  78         nanotime(&tv);
  79
  80         return (tv.tv_sec * 10000000ULL) + (tv.tv_nsec / 100ULL) + 0x01B21DD213814000ULL;
  81 }
  82
  83 void
  84 uuid_clear(uuid_t uu)
  85 {
  86         memset(uu, 0, sizeof(uuid_t));
  87 }
  88
  89 int
  90 uuid_compare(const uuid_t uu1, const uuid_t uu2)
  91 {
  92         return memcmp(uu1, uu2, sizeof(uuid_t));
  93 }
  94
  95 void
  96 uuid_copy(uuid_t dst, const uuid_t src)
  97 {
  98         memcpy(dst, src, sizeof(uuid_t));
  99 }
 100
 101 void
 102 uuid_generate_random(uuid_t out)
 103 {
 104         read_random(out, sizeof(uuid_t));
 105
 106         out[6] = (out[6] & 0x0F) | 0x40;
 107         out[8] = (out[8] & 0x3F) | 0x80;
 108 }
 109
 110 void
 111 uuid_generate_time(uuid_t out)
 112 {
 113         uint64_t time;
 114
 115         read_node(&out[10]);
 116         read_random(&out[8], 2);
 117
 118         time = read_time();
 119         out[0] = (uint8_t)(time >> 24);
 120         out[1] = (uint8_t)(time >> 16);
 121         out[2] = (uint8_t)(time >> 8);
 122         out[3] = (uint8_t)time;
 123         out[4] = (uint8_t)(time >> 40);
 124         out[5] = (uint8_t)(time >> 32);
 125         out[6] = (uint8_t)(time >> 56);
 126         out[7] = (uint8_t)(time >> 48);
 127
 128         out[6] = (out[6] & 0x0F) | 0x10;
 129         out[8] = (out[8] & 0x3F) | 0x80;
 130 }
 131
 132 void
 133 uuid_generate(uuid_t out)
 134 {
 135         uuid_generate_random(out);
 136 }
 137
 138 int
 139 uuid_is_null(const uuid_t uu)
 140 {
 141         return !memcmp(uu, UUID_NULL, sizeof(uuid_t));
 142 }
 143
 144 int
 145 uuid_parse(const char *in, uuid_t uu)
 146 {
 147         int n = 0;
 148
 149         sscanf(in,
 150                 "%hh2x%hh2x%hh2x%hh2x-"
 151                 "%hh2x%hh2x-"
 152                 "%hh2x%hh2x-"
 153                 "%hh2x%hh2x-"
 154                 "%hh2x%hh2x%hh2x%hh2x%hh2x%hh2x%n",
 155                 &uu[0], &uu[1], &uu[2], &uu[3],
 156                 &uu[4], &uu[5],
 157                 &uu[6], &uu[7],
 158                 &uu[8], &uu[9],
 159                 &uu[10], &uu[11], &uu[12], &uu[13], &uu[14], &uu[15], &n);
 160
 161         return (n != 36 || in[n] != '\0' ? -1 : 0);
 162 }
 163
 164 void
 165 uuid_unparse_lower(const uuid_t uu, char *out)
 166 {
 167         sprintf(out,
 168                 "%02x%02x%02x%02x-"
 169                 "%02x%02x-"
 170                 "%02x%02x-"
 171                 "%02x%02x-"
 172                 "%02x%02x%02x%02x%02x%02x",
 173                 uu[0], uu[1], uu[2], uu[3],
 174                 uu[4], uu[5],
 175                 uu[6], uu[7],
 176                 uu[8], uu[9],
 177                 uu[10], uu[11], uu[12], uu[13], uu[14], uu[15]);
 178 }
 179
 180 void
 181 uuid_unparse_upper(const uuid_t uu, char *out)
 182 {
 183         sprintf(out,
 184                 "%02X%02X%02X%02X-"
 185                 "%02X%02X-"
 186                 "%02X%02X-"
 187                 "%02X%02X-"
 188                 "%02X%02X%02X%02X%02X%02X",
 189                 uu[0], uu[1], uu[2], uu[3],
 190                 uu[4], uu[5],
 191                 uu[6], uu[7],
 192                 uu[8], uu[9],
 193                 uu[10], uu[11], uu[12], uu[13], uu[14], uu[15]);
 194 }
 195
 196 void
 197 uuid_unparse(const uuid_t uu, char *out)
 198 {
 199         uuid_unparse_upper(uu, out);
 200 }