src/libtpmtss/tpm_tss.c

   1 /*
   2  * Copyright (C) 2016 Andreas Steffen
   3  *
   4  * Copyright (C) secunet Security Networks AG
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2 of the License, or (at your
   9  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * for more details.
  15  */
  16
  17 #include "tpm_tss.h"
  18 #include "tpm_tss_tss2.h"
  19 #include "tpm_tss_trousers.h"
  20
  21 /**
  22  * Register plugins if built statically
  23  */
  24 #ifdef STATIC_PLUGIN_CONSTRUCTORS
  25 #include "plugin_constructors.c"
  26 #endif
  27
  28 /**
  29  * Reference counter for library initialization
  30  */
  31 static refcount_t libtpmtss_ref = 0;
  32
  33 /**
  34  * Described in header.
  35  */
  36 bool libtpmtss_init(void)
  37 {
  38         if (ref_cur(&libtpmtss_ref) || tpm_tss_tss2_init())
  39         {
  40                 ref_get(&libtpmtss_ref);
  41                 return TRUE;
  42         }
  43         return FALSE;
  44 }
  45
  46 /**
  47  * Described in header.
  48  */
  49 void libtpmtss_deinit(void)
  50 {
  51         if (ref_cur(&libtpmtss_ref) && ref_put(&libtpmtss_ref))
  52         {
  53                 tpm_tss_tss2_deinit();
  54         }
  55 }
  56
  57 typedef tpm_tss_t*(*tpm_tss_create)(void);
  58
  59 /**
  60  * See header.
  61  */
  62 tpm_tss_t *tpm_tss_probe(tpm_version_t version)
  63 {
  64         tpm_tss_create stacks[] = {
  65                 tpm_tss_tss2_create,
  66                 tpm_tss_trousers_create,
  67         };
  68         tpm_tss_t *tpm;
  69         int i;
  70
  71         for (i = 0; i < countof(stacks); i++)
  72         {
  73                 tpm = stacks[i]();
  74                 if (tpm)
  75                 {
  76                         if (version == TPM_VERSION_ANY || version == tpm->get_version(tpm))
  77                         {
  78                                 return tpm;
  79                         }
  80                 }
  81         }
  82         return NULL;
  83 }