frosix

Multiparty signature service (experimental)
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frosix_db_plugin.c (3513B)

      1 /*
      2   This file is part of Frosix
      3   Copyright (C) 2015, 2016 Anastasis SARL
      4 
      5   Frosix is free software; you can redistribute it and/or modify it under the
      6   terms of the GNU Affero General Public License as published by the Free Software
      7   Foundation; either version 3, or (at your option) any later version.
      8 
      9   Frosix is distributed in the hope that it will be useful, but WITHOUT ANY
     10   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
     11   A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more details.
     12 
     13   You should have received a copy of the GNU Affero General Public License along with
     14   Frosix; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
     15 */
     16 /**
     17  * @file frosix_db_plugin.c
     18  * @brief Logic to load database plugin
     19  * @author Christian Grothoff
     20  * @author Sree Harsha Totakura <sreeharsha@totakura.in>
     21  */
     22 #include "platform.h"
     23 #include "frosix_database_plugin.h"
     24 #include <ltdl.h>
     25 #include <gnunet/gnunet_util_lib.h>
     26 
     27 
     28 /**
     29  * Initialize the plugin.
     30  *
     31  * @param cfg configuration to use
     32  * @return #GNUNET_OK on success
     33  */
     34 struct FROSIX_DatabasePlugin *
     35 FROSIX_DB_plugin_load (const struct GNUNET_CONFIGURATION_Handle *cfg)
     36 {
     37   char *plugin_name;
     38   char *lib_name;
     39   struct FROSIX_DatabasePlugin *plugin;
     40 
     41   if (GNUNET_SYSERR ==
     42       GNUNET_CONFIGURATION_get_value_string (cfg,
     43                                              "frosix",
     44                                              "db",
     45                                              &plugin_name))
     46   {
     47     GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
     48                                "frosix",
     49                                "db");
     50     return NULL;
     51   }
     52   (void) GNUNET_asprintf (&lib_name,
     53                           "libfrosix_plugin_db_%s",
     54                           plugin_name);
     55   GNUNET_free (plugin_name);
     56   plugin = GNUNET_PLUGIN_load (lib_name,
     57                                (void *) cfg);
     58   if (NULL != plugin)
     59     plugin->library_name = lib_name;
     60   else
     61     lib_name = NULL;
     62   return plugin;
     63 }
     64 
     65 
     66 /**
     67  * Shutdown the plugin.
     68  *
     69  * @param plugin the plugin to unload
     70  */
     71 void
     72 FROSIX_DB_plugin_unload (struct FROSIX_DatabasePlugin *plugin)
     73 {
     74   char *lib_name;
     75 
     76   if (NULL == plugin)
     77     return;
     78   lib_name = plugin->library_name;
     79   GNUNET_assert (NULL == GNUNET_PLUGIN_unload (lib_name,
     80                                                plugin));
     81   GNUNET_free (lib_name);
     82 }
     83 
     84 
     85 /**
     86  * Libtool search path before we started.
     87  */
     88 static char *old_dlsearchpath;
     89 
     90 
     91 /**
     92  * Setup libtool paths.
     93  */
     94 void __attribute__ ((constructor))
     95 plugin_init ()
     96 {
     97   int err;
     98   const char *opath;
     99   char *path;
    100   char *cpath;
    101 
    102   err = lt_dlinit ();
    103   if (err > 0)
    104   {
    105     fprintf (stderr,
    106              ("Initialization of plugin mechanism failed: %s!\n"),
    107              lt_dlerror ());
    108     return;
    109   }
    110   opath = lt_dlgetsearchpath ();
    111   if (NULL != opath)
    112     old_dlsearchpath = GNUNET_strdup (opath);
    113   path = GNUNET_OS_installation_get_path (GNUNET_OS_IPK_LIBDIR);
    114   if (NULL != path)
    115   {
    116     if (NULL != opath)
    117     {
    118       GNUNET_asprintf (&cpath, "%s:%s", opath, path);
    119       lt_dlsetsearchpath (cpath);
    120       GNUNET_free (path);
    121       GNUNET_free (cpath);
    122     }
    123     else
    124     {
    125       lt_dlsetsearchpath (path);
    126       GNUNET_free (path);
    127     }
    128   }
    129 }
    130 
    131 
    132 /**
    133  * Shutdown libtool.
    134  */
    135 void __attribute__ ((destructor))
    136 plugin_fini ()
    137 {
    138   lt_dlsetsearchpath (old_dlsearchpath);
    139   if (NULL != old_dlsearchpath)
    140   {
    141     GNUNET_free (old_dlsearchpath);
    142   }
    143   lt_dlexit ();
    144 }
    145 
    146 
    147 /* end of frosix_db_plugin.c */