frosix

frosix_authorization_plugin.c (5267B)

---

 /*
   This file is part of Frosix
   Copyright (C) 2015, 2016, 2021 Anastasis SARL
 
   Frosix is free software; you can redistribute it and/or modify it under the
   terms of the GNU Affero General Public License as published by the Free Software
   Foundation; either version 3, or (at your option) any later version.
 
   Frosix is distributed in the hope that it will be useful, but WITHOUT ANY
   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
   A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more details.
 
   You should have received a copy of the GNU Affero General Public License along with
   Frosix; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
 */
 /**
  * @file frosix_authorization_plugin.c
  * @brief Logic to load authorization plugin
  * @author Christian Grothoff
  * @author Dominik Meister
  */
 #include "platform.h"
 #include "frosix_authorization_lib.h"
 #include <ltdl.h>
 
 
 /**
  * Head of linked list for all loaded plugins
  */
 static struct AuthPlugin *ap_head;
 
 /**
  * Tail ofinked list for all loaded plugins
  */
 static struct AuthPlugin *ap_tail;
 
 
 /**
  * Authentication plugin which is used to verify code based authentication
  * like SMS, E-Mail.
  */
 struct AuthPlugin
 {
   /**
    * Kept in a DLL.
    */
   struct AuthPlugin *next;
 
   /**
    * Kept in a DLL.
    */
   struct AuthPlugin *prev;
 
   /**
    * Actual plugin handle.
    */
   struct FROSIX_AuthorizationPlugin *authorization;
 
   /**
    * I.e. "sms", "phone".
    */
   char *name;
 
   /**
    * Name of the shared object providing the plugin logic.
    */
   char *lib_name;
 
   /**
    * Authorization context passed to the plugin.
    */
   struct FROSIX_AuthorizationContext ac;
 
 };
 
 
 struct FROSIX_AuthorizationPlugin *
 FROSIX_authorization_plugin_load (
   const char *method,
   struct FROSIX_DatabasePlugin *db,
   const struct GNUNET_CONFIGURATION_Handle *FH_cfg)
 {
   struct FROSIX_AuthorizationPlugin *authorization;
   char *lib_name;
   char *sec_name;
   struct AuthPlugin *ap;
   char *currency;
   struct TALER_Amount cost;
 
   for (ap = ap_head; NULL != ap; ap = ap->next)
     if (0 == strcmp (method,
                      ap->name))
       return ap->authorization;
   if (GNUNET_OK !=
       TALER_config_get_currency (FH_cfg,
                                  &currency))
     return NULL;
   ap = GNUNET_new (struct AuthPlugin);
   ap->ac.db = db;
   ap->ac.cfg = FH_cfg;
   GNUNET_asprintf (&sec_name,
                    "authorization-%s",
                    method);
   if (GNUNET_OK !=
       TALER_config_get_amount (FH_cfg,
                                sec_name,
                                "COST",
                                &cost))
   {
     GNUNET_log_config_missing (GNUNET_ERROR_TYPE_WARNING,
                                sec_name,
                                "COST");
     GNUNET_free (sec_name);
     GNUNET_free (currency);
     GNUNET_free (ap);
     return NULL;
   }
 
   GNUNET_free (currency);
   GNUNET_free (sec_name);
   GNUNET_asprintf (&lib_name,
                    "libfrosix_plugin_authorization_%s",
                    method);
   authorization = GNUNET_PLUGIN_load (lib_name,
                                       &ap->ac);
   if (NULL == authorization)
   {
     GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                 "Authentication method `%s' not supported\n",
                 method);
     GNUNET_free (lib_name);
     GNUNET_free (ap);
     return NULL;
   }
   authorization->cost = cost;
   ap->name = GNUNET_strdup (method);
   ap->lib_name = lib_name;
   ap->authorization = authorization;
   GNUNET_CONTAINER_DLL_insert (ap_head,
                                ap_tail,
                                ap);
   return authorization;
 }
 
 
 void
 FROSIX_authorization_plugin_shutdown (void)
 {
   struct AuthPlugin *ap;
 
   while (NULL != (ap = ap_head))
   {
     GNUNET_CONTAINER_DLL_remove (ap_head,
                                  ap_tail,
                                  ap);
     GNUNET_PLUGIN_unload (ap->lib_name,
                           ap->authorization);
     GNUNET_free (ap->lib_name);
     GNUNET_free (ap->name);
     GNUNET_free (ap);
   }
 }
 
 
 /**
  * Libtool search path before we started.
  */
 static char *old_dlsearchpath;
 
 
 /**
  * Setup libtool paths.
  */
 void __attribute__ ((constructor))
 frosix_authorization_plugin_init (void)
 {
   int err;
   const char *opath;
   char *path;
   char *cpath;
 
   err = lt_dlinit ();
   if (err > 0)
   {
     fprintf (stderr,
              ("Initialization of plugin mechanism failed: %s!\n"),
              lt_dlerror ());
     return;
   }
   opath = lt_dlgetsearchpath ();
   if (NULL != opath)
     old_dlsearchpath = GNUNET_strdup (opath);
   path = GNUNET_OS_installation_get_path (GNUNET_OS_IPK_LIBDIR);
   if (NULL != path)
   {
     if (NULL != opath)
     {
       GNUNET_asprintf (&cpath, "%s:%s", opath, path);
       lt_dlsetsearchpath (cpath);
       GNUNET_free (path);
       GNUNET_free (cpath);
     }
     else
     {
       lt_dlsetsearchpath (path);
       GNUNET_free (path);
     }
   }
 }
 
 
 /**
  * Shutdown libtool.
  */
 void __attribute__ ((destructor))
 frosix_authorization_plugin_fini (void)
 {
   lt_dlsetsearchpath (old_dlsearchpath);
   if (NULL != old_dlsearchpath)
   {
     GNUNET_free (old_dlsearchpath);
   }
   lt_dlexit ();
 }
 
 
 /* end of frosix_authorization_plugin.c */