src/plugin.c

   1 /*
   2  *
   3  *  neard - Near Field Communication manager
   4  *
   5  *  Copyright (C) 2011  Intel Corporation. All rights reserved.
   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 version 2 as
   9  *  published by the Free Software Foundation.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  *
  20  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #ifdef HAVE_CONFIG_H
  27 #include <config.h>
  28 #endif
  29
  30 #include <dlfcn.h>
  31
  32 #include <glib.h>
  33
  34 #ifdef NEAR_PLUGIN_BUILTIN
  35 #undef NEAR_PLUGIN_BUILTIN
  36 #endif
  37
  38 #include "near.h"
  39
  40 static GSList *plugins = NULL;
  41
  42 struct near_plugin {
  43         void *handle;
  44         gboolean active;
  45         struct near_plugin_desc *desc;
  46 };
  47
  48 static gint compare_priority(gconstpointer a, gconstpointer b)
  49 {
  50         const struct near_plugin *plugin1 = a;
  51         const struct near_plugin *plugin2 = b;
  52
  53         return plugin2->desc->priority - plugin1->desc->priority;
  54 }
  55
  56 static gboolean add_plugin(void *handle, struct near_plugin_desc *desc)
  57 {
  58         struct near_plugin *plugin;
  59
  60         if (desc->init == NULL)
  61                 return FALSE;
  62
  63         if (g_str_equal(desc->version, NEAR_VERSION) == FALSE) {
  64                 near_error("Version mismatch for %s", desc->description);
  65                 return FALSE;
  66         }
  67
  68         plugin = g_try_new0(struct near_plugin, 1);
  69         if (plugin == NULL)
  70                 return FALSE;
  71
  72         plugin->handle = handle;
  73         plugin->active = FALSE;
  74         plugin->desc = desc;
  75
  76         plugins = g_slist_insert_sorted(plugins, plugin, compare_priority);
  77
  78         return TRUE;
  79 }
  80
  81 static gboolean check_plugin(struct near_plugin_desc *desc,
  82                                 char **patterns, char **excludes)
  83 {
  84         if (excludes) {
  85                 for (; *excludes; excludes++)
  86                         if (g_pattern_match_simple(*excludes, desc->name))
  87                                 break;
  88                 if (*excludes) {
  89                         near_info("Excluding %s", desc->description);
  90                         return FALSE;
  91                 }
  92         }
  93
  94         if (patterns) {
  95                 for (; *patterns; patterns++)
  96                         if (g_pattern_match_simple(*patterns, desc->name))
  97                                 break;
  98                 if (!*patterns) {
  99                         near_info("Ignoring %s", desc->description);
 100                         return FALSE;
 101                 }
 102         }
 103
 104         return TRUE;
 105 }
 106
 107 #include "builtin.h"
 108
 109 int __near_plugin_init(const char *pattern, const char *exclude)
 110 {
 111         gchar **patterns = NULL;
 112         gchar **excludes = NULL;
 113         GSList *list;
 114         GDir *dir;
 115         const gchar *file;
 116         gchar *filename;
 117         unsigned int i;
 118
 119         DBG("");
 120
 121         if (pattern)
 122                 patterns = g_strsplit_set(pattern, ":, ", -1);
 123
 124         if (exclude)
 125                 excludes = g_strsplit_set(exclude, ":, ", -1);
 126
 127         for (i = 0; __near_builtin[i]; i++) {
 128                 if (check_plugin(__near_builtin[i],
 129                                                 patterns, excludes) == FALSE)
 130                         continue;
 131
 132                 add_plugin(NULL, __near_builtin[i]);
 133         }
 134
 135         dir = g_dir_open(PLUGINDIR, 0, NULL);
 136         if (dir != NULL) {
 137                 while ((file = g_dir_read_name(dir)) != NULL) {
 138                         void *handle;
 139                         struct near_plugin_desc *desc;
 140
 141                         if (g_str_has_prefix(file, "lib") == TRUE ||
 142                                         g_str_has_suffix(file, ".so") == FALSE)
 143                                 continue;
 144
 145                         filename = g_build_filename(PLUGINDIR, file, NULL);
 146
 147                         handle = dlopen(filename, RTLD_NOW);
 148                         if (handle == NULL) {
 149                                 near_error("Can't load %s: %s",
 150                                                         filename, dlerror());
 151                                 g_free(filename);
 152                                 continue;
 153                         }
 154
 155                         g_free(filename);
 156
 157                         desc = dlsym(handle, "near_plugin_desc");
 158                         if (desc == NULL) {
 159                                 near_error("Can't load symbol: %s",
 160                                                                 dlerror());
 161                                 dlclose(handle);
 162                                 continue;
 163                         }
 164
 165                         if (check_plugin(desc, patterns, excludes) == FALSE) {
 166                                 dlclose(handle);
 167                                 continue;
 168                         }
 169
 170                         if (add_plugin(handle, desc) == FALSE)
 171                                 dlclose(handle);
 172                 }
 173
 174                 g_dir_close(dir);
 175         }
 176
 177         for (list = plugins; list; list = list->next) {
 178                 struct near_plugin *plugin = list->data;
 179
 180                 if (plugin->desc->init() < 0)
 181                         continue;
 182
 183                 plugin->active = TRUE;
 184         }
 185
 186         g_strfreev(patterns);
 187         g_strfreev(excludes);
 188
 189         return 0;
 190 }
 191
 192 void __near_plugin_cleanup(void)
 193 {
 194         GSList *list;
 195
 196         DBG("");
 197
 198         for (list = plugins; list; list = list->next) {
 199                 struct near_plugin *plugin = list->data;
 200
 201                 if (plugin->active == TRUE && plugin->desc->exit)
 202                         plugin->desc->exit();
 203
 204                 if (plugin->handle != NULL)
 205                         dlclose(plugin->handle);
 206
 207                 g_free(plugin);
 208         }
 209
 210         g_slist_free(plugins);
 211 }