source/ps/GUID.cpp

   1 /* Copyright (C) 2013 Wildfire Games.
   2  * This file is part of 0 A.D.
   3  *
   4  * 0 A.D. is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * 0 A.D. is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17 #include "precompiled.h"
  18 #include "lib/sysdep/sysdep.h"
  19 #include "ps/CStr.h"
  20
  21 CStr ps_generate_guid(void)
  22 {
  23         // TODO: Ideally this will be guaranteed unique (and verified
  24         // cryptographically) since we'll rely on it to identify hosts
  25         // and associate them with player controls (e.g. to support
  26         // leaving/rejoining in-progress games), and we don't want
  27         // a host to masquerade as someone else.
  28         // For now, just try to pick a very random number.
  29
  30         CStr guid;
  31         for (size_t i = 0; i < 2; ++i)
  32         {
  33                 u32 r = 0;
  34                 sys_generate_random_bytes((u8*)&r, sizeof(r));
  35                 char buf[32];
  36                 sprintf_s(buf, ARRAY_SIZE(buf), "%08X", r);
  37                 guid += buf;
  38         }
  39
  40         return guid;
  41 }