src/plugin.c

   1 /*
   2  *
   3  *  Connection Manager
   4  *
   5  *  Copyright (C) 2007-2010  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                                 char **patterns, char **excludes)
  90 {
  91         if (excludes) {
  92                 for (; *excludes; excludes++)
  93                         if (g_pattern_match_simple(*excludes, desc->name))
  94                                 break;
  95                 if (*excludes) {
  96                         connman_info("Excluding %s", desc->description);
  97                         return FALSE;
  98                 }
  99         }
 100
 101         if (patterns) {
 102                 for (; *patterns; patterns++)
 103                         if (g_pattern_match_simple(*patterns, desc->name))
 104                                 break;
 105                 if (!*patterns) {
 106                         connman_info("Ignoring %s", desc->description);
 107                         return FALSE;
 108                 }
 109         }
 110
 111         return TRUE;
 112 }
 113
 114 #include "builtin.h"
 115
 116 int __connman_plugin_init(const char *pattern, const char *exclude)
 117 {
 118         gchar **patterns = NULL;
 119         gchar **excludes = NULL;
 120         GSList *list;
 121         GDir *dir;
 122         const gchar *file;
 123         gchar *filename;
 124         unsigned int i;
 125
 126         DBG("");
 127
 128         if (pattern)
 129                 patterns = g_strsplit_set(pattern, ":, ", -1);
 130
 131         if (exclude)
 132                 excludes = g_strsplit_set(exclude, ":, ", -1);
 133
 134         for (i = 0; __connman_builtin[i]; i++) {
 135                 if (check_plugin(__connman_builtin[i],
 136                                                 patterns, excludes) == FALSE)
 137                         continue;
 138
 139                 add_plugin(NULL, __connman_builtin[i]);
 140         }
 141
 142         dir = g_dir_open(PLUGINDIR, 0, NULL);
 143         if (dir != NULL) {
 144                 while ((file = g_dir_read_name(dir)) != NULL) {
 145                         void *handle;
 146                         struct connman_plugin_desc *desc;
 147
 148                         if (g_str_has_prefix(file, "lib") == TRUE ||
 149                                         g_str_has_suffix(file, ".so") == FALSE)
 150                                 continue;
 151
 152                         filename = g_build_filename(PLUGINDIR, file, NULL);
 153
 154                         handle = dlopen(filename, PLUGINFLAG);
 155                         if (handle == NULL) {
 156                                 connman_error("Can't load %s: %s",
 157                                                         filename, dlerror());
 158                                 g_free(filename);
 159                                 continue;
 160                         }
 161
 162                         g_free(filename);
 163
 164                         desc = dlsym(handle, "connman_plugin_desc");
 165                         if (desc == NULL) {
 166                                 connman_error("Can't load symbol: %s",
 167                                                                 dlerror());
 168                                 dlclose(handle);
 169                                 continue;
 170                         }
 171
 172                         if (check_plugin(desc, patterns, excludes) == FALSE) {
 173                                 dlclose(handle);
 174                                 continue;
 175                         }
 176
 177                         if (add_plugin(handle, desc) == FALSE)
 178                                 dlclose(handle);
 179                 }
 180
 181                 g_dir_close(dir);
 182         }
 183
 184         for (list = plugins; list; list = list->next) {
 185                 struct connman_plugin *plugin = list->data;
 186
 187                 if (plugin->desc->init() < 0)
 188                         continue;
 189
 190                 plugin->active = TRUE;
 191         }
 192
 193         g_strfreev(patterns);
 194         g_strfreev(excludes);
 195
 196         return 0;
 197 }
 198
 199 void __connman_plugin_cleanup(void)
 200 {
 201         GSList *list;
 202
 203         DBG("");
 204
 205         for (list = plugins; list; list = list->next) {
 206                 struct connman_plugin *plugin = list->data;
 207
 208                 if (plugin->active == TRUE && plugin->desc->exit)
 209                         plugin->desc->exit();
 210
 211                 if (plugin->handle != NULL)
 212                         dlclose(plugin->handle);
 213
 214                 g_free(plugin);
 215         }
 216
 217         g_slist_free(plugins);
 218 }