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 /*
  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("Invalid version %s for %s", desc->version,
  72                                                         desc->description);
  73                 return FALSE;
  74         }
  75
  76         plugin = g_try_new0(struct connman_plugin, 1);
  77         if (plugin == NULL)
  78                 return FALSE;
  79
  80         plugin->handle = handle;
  81         plugin->active = FALSE;
  82         plugin->desc = desc;
  83
  84         __connman_log_enable(desc->debug_start, desc->debug_stop);
  85
  86         plugins = g_slist_insert_sorted(plugins, plugin, compare_priority);
  87
  88         return TRUE;
  89 }
  90
  91 static gboolean check_plugin(struct connman_plugin_desc *desc,
  92                                 char **patterns, char **excludes)
  93 {
  94         if (excludes) {
  95                 for (; *excludes; excludes++)
  96                         if (g_pattern_match_simple(*excludes, desc->name))
  97                                 break;
  98                 if (*excludes) {
  99                         connman_info("Excluding %s", desc->description);
 100                         return FALSE;
 101                 }
 102         }
 103
 104         if (patterns) {
 105                 for (; *patterns; patterns++)
 106                         if (g_pattern_match_simple(*patterns, desc->name))
 107                                 break;
 108                 if (!*patterns) {
 109                         connman_info("Ignoring %s", desc->description);
 110                         return FALSE;
 111                 }
 112         }
 113
 114         return TRUE;
 115 }
 116
 117 #include "builtin.h"
 118
 119 int __connman_plugin_init(const char *pattern, const char *exclude)
 120 {
 121         gchar **patterns = NULL;
 122         gchar **excludes = NULL;
 123         GSList *list;
 124         GDir *dir;
 125         const gchar *file;
 126         gchar *filename;
 127         unsigned int i;
 128
 129         DBG("");
 130
 131         if (pattern)
 132                 patterns = g_strsplit_set(pattern, ":, ", -1);
 133
 134         if (exclude)
 135                 excludes = g_strsplit_set(exclude, ":, ", -1);
 136
 137         for (i = 0; __connman_builtin[i]; i++) {
 138                 if (check_plugin(__connman_builtin[i],
 139                                                 patterns, excludes) == FALSE)
 140                         continue;
 141
 142                 add_plugin(NULL, __connman_builtin[i]);
 143         }
 144
 145         dir = g_dir_open(PLUGINDIR, 0, NULL);
 146         if (dir != NULL) {
 147                 while ((file = g_dir_read_name(dir)) != NULL) {
 148                         void *handle;
 149                         struct connman_plugin_desc *desc;
 150
 151                         if (g_str_has_prefix(file, "lib") == TRUE ||
 152                                         g_str_has_suffix(file, ".so") == FALSE)
 153                                 continue;
 154
 155                         filename = g_build_filename(PLUGINDIR, file, NULL);
 156
 157                         handle = dlopen(filename, PLUGINFLAG);
 158                         if (handle == NULL) {
 159                                 connman_error("Can't load %s: %s",
 160                                                         filename, dlerror());
 161                                 g_free(filename);
 162                                 continue;
 163                         }
 164
 165                         g_free(filename);
 166
 167                         desc = dlsym(handle, "connman_plugin_desc");
 168                         if (desc == NULL) {
 169                                 connman_error("Can't load symbol: %s",
 170                                                                 dlerror());
 171                                 dlclose(handle);
 172                                 continue;
 173                         }
 174
 175                         if (check_plugin(desc, patterns, excludes) == FALSE) {
 176                                 dlclose(handle);
 177                                 continue;
 178                         }
 179
 180                         if (add_plugin(handle, desc) == FALSE)
 181                                 dlclose(handle);
 182                 }
 183
 184                 g_dir_close(dir);
 185         }
 186
 187         for (list = plugins; list; list = list->next) {
 188                 struct connman_plugin *plugin = list->data;
 189
 190                 if (plugin->desc->init() < 0)
 191                         continue;
 192
 193                 plugin->active = TRUE;
 194         }
 195
 196         g_strfreev(patterns);
 197         g_strfreev(excludes);
 198
 199         return 0;
 200 }
 201
 202 void __connman_plugin_cleanup(void)
 203 {
 204         GSList *list;
 205
 206         DBG("");
 207
 208         for (list = plugins; list; list = list->next) {
 209                 struct connman_plugin *plugin = list->data;
 210
 211                 if (plugin->active == TRUE && plugin->desc->exit)
 212                         plugin->desc->exit();
 213
 214                 if (plugin->handle != NULL)
 215                         dlclose(plugin->handle);
 216
 217                 g_free(plugin);
 218         }
 219
 220         g_slist_free(plugins);
 221 }