src/plugin.c

   1 /*
   2  *
   3  *  Connection Manager
   4  *
   5  *  Copyright (C) 2007-2009  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 #include <dlfcn.h>
  27
  28 #include <glib.h>
  29
  30 #ifdef CONNMAN_PLUGIN_BUILTIN
  31 #undef CONNMAN_PLUGIN_BUILTIN
  32 #endif
  33
  34 #include "connman.h"
  35
  36 /*
  37  * Plugins that are using libraries with threads and their own mainloop
  38  * will crash on exit. This is a bug inside these libraries, but there is
  39  * nothing much that can be done about it.
  40  */
  41 #ifdef NEED_THREADS
  42 #define PLUGINFLAG (RTLD_NOW | RTLD_NODELETE)
  43 #else
  44 #define PLUGINFLAG (RTLD_NOW)
  45 #endif
  46
  47 static GSList *plugins = NULL;
  48
  49 struct connman_plugin {
  50         void *handle;
  51         gboolean active;
  52         struct connman_plugin_desc *desc;
  53 };
  54
  55 static gint compare_priority(gconstpointer a, gconstpointer b)
  56 {
  57         const struct connman_plugin *plugin1 = a;
  58         const struct connman_plugin *plugin2 = b;
  59
  60         return plugin2->desc->priority - plugin1->desc->priority;
  61 }
  62
  63 static gboolean add_plugin(void *handle, struct connman_plugin_desc *desc)
  64 {
  65         struct connman_plugin *plugin;
  66
  67         if (desc->init == NULL)
  68                 return FALSE;
  69
  70         if (g_str_equal(desc->version, CONNMAN_VERSION) == FALSE) {
  71                 connman_error("Version mismatch for %s", desc->description);
  72                 return FALSE;
  73         }
  74
  75         plugin = g_try_new0(struct connman_plugin, 1);
  76         if (plugin == NULL)
  77                 return FALSE;
  78
  79         plugin->handle = handle;
  80         plugin->active = FALSE;
  81         plugin->desc = desc;
  82
  83         plugins = g_slist_insert_sorted(plugins, plugin, compare_priority);
  84
  85         return TRUE;
  86 }
  87
  88 static gboolean check_plugin(struct connman_plugin_desc *desc,
  89                                 const char *pattern, const char *exclude)
  90 {
  91         if (exclude != NULL &&
  92                         g_pattern_match_simple(exclude, desc->name) == TRUE) {
  93                 connman_info("Excluding %s", desc->description);
  94                 return FALSE;
  95         }
  96
  97         if (pattern != NULL &&
  98                         g_pattern_match_simple(pattern, desc->name) == FALSE) {
  99                 connman_info("Ignoring %s", desc->description);
 100                 return FALSE;
 101         }
 102
 103         return TRUE;
 104 }
 105
 106 #include "builtin.h"
 107
 108 int __connman_plugin_init(const char *pattern, const char *exclude)
 109 {
 110         GSList *list;
 111         GDir *dir;
 112         const gchar *file;
 113         gchar *filename;
 114         unsigned int i;
 115
 116         DBG("");
 117
 118         for (i = 0; __connman_builtin[i]; i++) {
 119                 if (check_plugin(__connman_builtin[i],
 120                                                 pattern, exclude) == FALSE)
 121                         continue;
 122
 123                 add_plugin(NULL, __connman_builtin[i]);
 124         }
 125
 126         dir = g_dir_open(PLUGINDIR, 0, NULL);
 127         if (dir != NULL) {
 128                 while ((file = g_dir_read_name(dir)) != NULL) {
 129                         void *handle;
 130                         struct connman_plugin_desc *desc;
 131
 132                         if (g_str_has_prefix(file, "lib") == TRUE ||
 133                                         g_str_has_suffix(file, ".so") == FALSE)
 134                                 continue;
 135
 136                         filename = g_build_filename(PLUGINDIR, file, NULL);
 137
 138                         handle = dlopen(filename, PLUGINFLAG);
 139                         if (handle == NULL) {
 140                                 connman_error("Can't load %s: %s",
 141                                                         filename, dlerror());
 142                                 g_free(filename);
 143                                 continue;
 144                         }
 145
 146                         g_free(filename);
 147
 148                         desc = dlsym(handle, "connman_plugin_desc");
 149                         if (desc == NULL) {
 150                                 connman_error("Can't load symbol: %s",
 151                                                                 dlerror());
 152                                 dlclose(handle);
 153                                 continue;
 154                         }
 155
 156                         if (check_plugin(desc, pattern, exclude) == FALSE) {
 157                                 dlclose(handle);
 158                                 continue;
 159                         }
 160
 161                         if (add_plugin(handle, desc) == FALSE)
 162                                 dlclose(handle);
 163                 }
 164
 165                 g_dir_close(dir);
 166         }
 167
 168         for (list = plugins; list; list = list->next) {
 169                 struct connman_plugin *plugin = list->data;
 170
 171                 if (plugin->desc->init() < 0)
 172                         continue;
 173
 174                 plugin->active = TRUE;
 175         }
 176
 177         return 0;
 178 }
 179
 180 void __connman_plugin_cleanup(void)
 181 {
 182         GSList *list;
 183
 184         DBG("");
 185
 186         for (list = plugins; list; list = list->next) {
 187                 struct connman_plugin *plugin = list->data;
 188
 189                 if (plugin->active == TRUE && plugin->desc->exit)
 190                         plugin->desc->exit();
 191
 192                 if (plugin->handle != NULL)
 193                         dlclose(plugin->handle);
 194
 195                 g_free(plugin);
 196         }
 197
 198         g_slist_free(plugins);
 199 }