source3/lib/util_uuid.c

   1 /*
   2  *  Unix SMB/CIFS implementation.
   3  *  UUID server routines
   4  *  Copyright (C) Theodore Ts'o               1996, 1997,
   5  *  Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2002.
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include "includes.h"
  23
  24 /*
  25  * Offset between 15-Oct-1582 and 1-Jan-70
  26  */
  27 #define TIME_OFFSET_HIGH 0x01B21DD2
  28 #define TIME_OFFSET_LOW  0x13814000
  29
  30 struct uuid {
  31         uint32   time_low;
  32         uint16   time_mid;
  33         uint16   time_hi_and_version;
  34         uint8    clock_seq[2];
  35         uint8    node[6];
  36 };
  37
  38
  39 static void uuid_pack(const struct uuid *uu, GUID *ptr)
  40 {
  41         uint8 *out = ptr->info;
  42
  43         SIVAL(out, 0, uu->time_low);
  44         SSVAL(out, 4, uu->time_mid);
  45         SSVAL(out, 6, uu->time_hi_and_version);
  46         memcpy(out+8, uu->clock_seq, 2);
  47         memcpy(out+10, uu->node, 6);
  48 }
  49
  50 static void uuid_unpack(const GUID in, struct uuid *uu)
  51 {
  52         const uint8 *ptr = in.info;
  53
  54         uu->time_low = IVAL(ptr, 0);
  55         uu->time_mid = SVAL(ptr, 4);
  56         uu->time_hi_and_version = SVAL(ptr, 6);
  57         memcpy(uu->clock_seq, ptr+8, 2);
  58         memcpy(uu->node, ptr+10, 6);
  59 }
  60
  61 void smb_uuid_generate_random(GUID *out)
  62 {
  63         GUID tmp;
  64         struct uuid uu;
  65
  66         generate_random_buffer(tmp.info, sizeof(tmp.info), True);
  67         uuid_unpack(tmp, &uu);
  68
  69         uu.clock_seq[0] = (uu.clock_seq[0] & 0x3F) | 0x80;
  70         uu.time_hi_and_version = (uu.time_hi_and_version & 0x0FFF) | 0x4000;
  71         uuid_pack(&uu, out);
  72 }
  73
  74 char *smb_uuid_to_string(const GUID in)
  75 {
  76         struct uuid uu;
  77         char *out;
  78
  79         uuid_unpack(in, &uu);
  80
  81         asprintf(&out, "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
  82                  uu.time_low, uu.time_mid, uu.time_hi_and_version,
  83                  uu.clock_seq[0], uu.clock_seq[1],
  84                  uu.node[0], uu.node[1], uu.node[2],
  85                  uu.node[3], uu.node[4], uu.node[5]);
  86
  87         return out;
  88 }
  89
  90 const char *smb_uuid_string_static(const GUID in)
  91 {
  92         struct uuid uu;
  93         static char out[37];
  94
  95         uuid_unpack(in, &uu);
  96         slprintf(out, sizeof(out) -1,
  97                  "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
  98                  uu.time_low, uu.time_mid, uu.time_hi_and_version,
  99                  uu.clock_seq[0], uu.clock_seq[1],
 100                  uu.node[0], uu.node[1], uu.node[2],
 101                  uu.node[3], uu.node[4], uu.node[5]);
 102         return out;
 103 }