src/plugin.c

   1 /*
   2  *
   3  *  Connection Manager
   4  *
   5  *  Copyright (C) 2007-2012  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 static GSList *plugins = NULL;
  37
  38 struct connman_plugin {
  39         void *handle;
  40         bool active;
  41         struct connman_plugin_desc *desc;
  42 };
  43
  44 static gint compare_priority(gconstpointer a, gconstpointer b)
  45 {
  46         const struct connman_plugin *plugin1 = a;
  47         const struct connman_plugin *plugin2 = b;
  48
  49         return plugin2->desc->priority - plugin1->desc->priority;
  50 }
  51
  52 static bool add_plugin(void *handle, struct connman_plugin_desc *desc)
  53 {
  54         struct connman_plugin *plugin;
  55
  56         if (!desc->init)
  57                 return false;
  58
  59         if (!g_str_equal(desc->version, CONNMAN_VERSION)) {
  60                 connman_error("Invalid version %s for %s", desc->version,
  61                                                         desc->description);
  62                 return false;
  63         }
  64
  65         plugin = g_try_new0(struct connman_plugin, 1);
  66         if (!plugin)
  67                 return false;
  68
  69         plugin->handle = handle;
  70         plugin->active = false;
  71         plugin->desc = desc;
  72
  73         __connman_log_enable(desc->debug_start, desc->debug_stop);
  74
  75         plugins = g_slist_insert_sorted(plugins, plugin, compare_priority);
  76
  77         return true;
  78 }
  79
  80 static bool check_plugin(struct connman_plugin_desc *desc,
  81                                 char **patterns, char **excludes)
  82 {
  83         if (excludes) {
  84                 for (; *excludes; excludes++)
  85                         if (g_pattern_match_simple(*excludes, desc->name))
  86                                 break;
  87                 if (*excludes) {
  88                         connman_info("Excluding %s", desc->description);
  89                         return false;
  90                 }
  91         }
  92
  93         if (patterns) {
  94                 for (; *patterns; patterns++)
  95                         if (g_pattern_match_simple(*patterns, desc->name))
  96                                 break;
  97                 if (!*patterns) {
  98                         connman_info("Ignoring %s", desc->description);
  99                         return false;
 100                 }
 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         gchar **patterns = NULL;
 111         gchar **excludes = NULL;
 112         GSList *list;
 113         GDir *dir;
 114         const gchar *file;
 115         gchar *filename;
 116         unsigned int i;
 117
 118         DBG("");
 119
 120         if (pattern)
 121                 patterns = g_strsplit_set(pattern, ":, ", -1);
 122
 123         if (exclude)
 124                 excludes = g_strsplit_set(exclude, ":, ", -1);
 125
 126         for (i = 0; __connman_builtin[i]; i++) {
 127                 if (!check_plugin(__connman_builtin[i], patterns, excludes))
 128                         continue;
 129
 130                 add_plugin(NULL, __connman_builtin[i]);
 131         }
 132
 133         dir = g_dir_open(PLUGINDIR, 0, NULL);
 134         if (dir) {
 135                 while ((file = g_dir_read_name(dir))) {
 136                         void *handle;
 137                         struct connman_plugin_desc *desc;
 138
 139                         if (g_str_has_prefix(file, "lib") ||
 140                                         !g_str_has_suffix(file, ".so"))
 141                                 continue;
 142
 143                         filename = g_build_filename(PLUGINDIR, file, NULL);
 144
 145                         handle = dlopen(filename, RTLD_NOW);
 146                         if (!handle) {
 147                                 connman_error("Can't load %s: %s",
 148                                                         filename, dlerror());
 149                                 g_free(filename);
 150                                 continue;
 151                         }
 152
 153                         g_free(filename);
 154
 155                         desc = dlsym(handle, "connman_plugin_desc");
 156                         if (!desc) {
 157                                 connman_error("Can't load symbol: %s",
 158                                                                 dlerror());
 159                                 dlclose(handle);
 160                                 continue;
 161                         }
 162
 163                         if (!check_plugin(desc, patterns, excludes)) {
 164                                 dlclose(handle);
 165                                 continue;
 166                         }
 167
 168                         if (!add_plugin(handle, desc))
 169                                 dlclose(handle);
 170                 }
 171
 172                 g_dir_close(dir);
 173         }
 174
 175         for (list = plugins; list; list = list->next) {
 176                 struct connman_plugin *plugin = list->data;
 177
 178                 if (plugin->desc->init() < 0)
 179                         continue;
 180
 181                 plugin->active = true;
 182         }
 183
 184         g_strfreev(patterns);
 185         g_strfreev(excludes);
 186
 187         return 0;
 188 }
 189
 190 void __connman_plugin_cleanup(void)
 191 {
 192         GSList *list;
 193
 194         DBG("");
 195
 196         for (list = plugins; list; list = list->next) {
 197                 struct connman_plugin *plugin = list->data;
 198
 199                 if (plugin->active && plugin->desc->exit)
 200                         plugin->desc->exit();
 201
 202                 if (plugin->handle)
 203                         dlclose(plugin->handle);
 204
 205                 g_free(plugin);
 206         }
 207
 208         g_slist_free(plugins);
 209 }