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 void smb_uuid_pack(const struct uuid *uu, UUID_FLAT *ptr)
  31 {
  32         SIVAL(ptr, 0, uu->time_low);
  33         SSVAL(ptr, 4, uu->time_mid);
  34         SSVAL(ptr, 6, uu->time_hi_and_version);
  35         memcpy(ptr+8, uu->clock_seq, 2);
  36         memcpy(ptr+10, uu->node, 6);
  37 }
  38
  39 void smb_uuid_unpack(const UUID_FLAT in, struct uuid *uu)
  40 {
  41         uu->time_low = IVAL(in.info, 0);
  42         uu->time_mid = SVAL(in.info, 4);
  43         uu->time_hi_and_version = SVAL(in.info, 6);
  44         memcpy(uu->clock_seq, in.info+8, 2);
  45         memcpy(uu->node, in.info+10, 6);
  46 }
  47
  48 const struct uuid smb_uuid_unpack_static(const UUID_FLAT in)
  49 {
  50         static struct uuid uu;
  51
  52         smb_uuid_unpack(in, &uu);
  53         return uu;
  54 }
  55
  56 void smb_uuid_generate_random(struct uuid *uu)
  57 {
  58         UUID_FLAT tmp;
  59
  60         generate_random_buffer(tmp.info, sizeof(tmp.info), True);
  61         smb_uuid_unpack(tmp, uu);
  62
  63         uu->clock_seq[0] = (uu->clock_seq[0] & 0x3F) | 0x80;
  64         uu->time_hi_and_version = (uu->time_hi_and_version & 0x0FFF) | 0x4000;
  65 }
  66
  67 char *smb_uuid_to_string(const struct uuid uu)
  68 {
  69         char *out;
  70
  71         asprintf(&out, "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
  72                  uu.time_low, uu.time_mid, uu.time_hi_and_version,
  73                  uu.clock_seq[0], uu.clock_seq[1],
  74                  uu.node[0], uu.node[1], uu.node[2],
  75                  uu.node[3], uu.node[4], uu.node[5]);
  76
  77         return out;
  78 }
  79
  80 const char *smb_uuid_string_static(const struct uuid uu)
  81 {
  82         static char out[37];
  83
  84         slprintf(out, sizeof(out),
  85                  "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
  86                  uu.time_low, uu.time_mid, uu.time_hi_and_version,
  87                  uu.clock_seq[0], uu.clock_seq[1],
  88                  uu.node[0], uu.node[1], uu.node[2],
  89                  uu.node[3], uu.node[4], uu.node[5]);
  90         return out;
  91 }