src/plugin.c

   1 /*
   2  *
   3  *  oFono - Open Source Telephony
   4  *
   5  *  Copyright (C) 2008-2010  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 #include "ofono.h"
  31
  32 static GSList *plugins = NULL;
  33
  34 struct ofono_plugin {
  35         void *handle;
  36         gboolean active;
  37         struct ofono_plugin_desc *desc;
  38 };
  39
  40 static gint compare_priority(gconstpointer a, gconstpointer b)
  41 {
  42         const struct ofono_plugin *plugin1 = a;
  43         const struct ofono_plugin *plugin2 = b;
  44
  45         return plugin2->desc->priority - plugin1->desc->priority;
  46 }
  47
  48 static gboolean add_plugin(void *handle, struct ofono_plugin_desc *desc)
  49 {
  50         struct ofono_plugin *plugin;
  51
  52         if (desc->init == NULL)
  53                 return FALSE;
  54
  55         if (g_str_equal(desc->version, OFONO_VERSION) == FALSE) {
  56                 ofono_error("Version mismatch for %s: found %s, expected %s",
  57                             desc->description, desc->version, OFONO_VERSION);
  58                 return FALSE;
  59         }
  60
  61         plugin = g_try_new0(struct ofono_plugin, 1);
  62         if (plugin == NULL)
  63                 return FALSE;
  64
  65         plugin->handle = handle;
  66         plugin->active = FALSE;
  67         plugin->desc = desc;
  68
  69         __ofono_log_enable(desc->debug_start, desc->debug_stop);
  70
  71         plugins = g_slist_insert_sorted(plugins, plugin, compare_priority);
  72
  73         return TRUE;
  74 }
  75
  76 static gboolean check_plugin(struct ofono_plugin_desc *desc,
  77                                 char **patterns, char **excludes)
  78 {
  79         if (excludes) {
  80                 for (; *excludes; excludes++)
  81                         if (g_pattern_match_simple(*excludes, desc->name))
  82                                 break;
  83                 if (*excludes) {
  84                         ofono_info("Excluding %s", desc->description);
  85                         return FALSE;
  86                 }
  87         }
  88
  89         if (patterns) {
  90                 for (; *patterns; patterns++)
  91                         if (g_pattern_match_simple(*patterns, desc->name))
  92                                 break;
  93                 if (*patterns == NULL) {
  94                         ofono_info("Ignoring %s", desc->description);
  95                         return FALSE;
  96                 }
  97         }
  98
  99         return TRUE;
 100 }
 101
 102 #include "builtin.h"
 103
 104 int __ofono_plugin_init(const char *pattern, const char *exclude)
 105 {
 106         gchar **patterns = NULL;
 107         gchar **excludes = NULL;
 108         GSList *list;
 109         GDir *dir;
 110         const gchar *file;
 111         gchar *filename;
 112         unsigned int i;
 113
 114         DBG("");
 115
 116         if (pattern)
 117                 patterns = g_strsplit_set(pattern, ":, ", -1);
 118
 119         if (exclude)
 120                 excludes = g_strsplit_set(exclude, ":, ", -1);
 121
 122         for (i = 0; __ofono_builtin[i]; i++) {
 123                 if (check_plugin(__ofono_builtin[i],
 124                                         patterns, excludes) == FALSE)
 125                         continue;
 126
 127                 add_plugin(NULL, __ofono_builtin[i]);
 128         }
 129
 130         dir = g_dir_open(PLUGINDIR, 0, NULL);
 131         if (dir != NULL) {
 132                 while ((file = g_dir_read_name(dir)) != NULL) {
 133                         void *handle;
 134                         struct ofono_plugin_desc *desc;
 135
 136                         if (g_str_has_prefix(file, "lib") == TRUE ||
 137                                         g_str_has_suffix(file, ".so") == FALSE)
 138                                 continue;
 139
 140                         filename = g_build_filename(PLUGINDIR, file, NULL);
 141
 142                         handle = dlopen(filename, RTLD_NOW);
 143                         if (handle == NULL) {
 144                                 ofono_error("Can't load %s: %s",
 145                                                         filename, dlerror());
 146                                 g_free(filename);
 147                                 continue;
 148                         }
 149
 150                         g_free(filename);
 151
 152                         desc = dlsym(handle, "ofono_plugin_desc");
 153                         if (desc == NULL) {
 154                                 ofono_error("Can't load symbol: %s",
 155                                                                 dlerror());
 156                                 dlclose(handle);
 157                                 continue;
 158                         }
 159
 160                         if (check_plugin(desc, patterns, excludes) == FALSE) {
 161                                 dlclose(handle);
 162                                 continue;
 163                         }
 164
 165                         if (add_plugin(handle, desc) == FALSE)
 166                                 dlclose(handle);
 167                 }
 168
 169                 g_dir_close(dir);
 170         }
 171
 172         for (list = plugins; list; list = list->next) {
 173                 struct ofono_plugin *plugin = list->data;
 174
 175                 if (plugin->desc->init() < 0)
 176                         continue;
 177
 178                 plugin->active = TRUE;
 179         }
 180
 181         g_strfreev(patterns);
 182         g_strfreev(excludes);
 183
 184         return 0;
 185 }
 186
 187 void __ofono_plugin_cleanup(void)
 188 {
 189         GSList *list;
 190
 191         DBG("");
 192
 193         for (list = plugins; list; list = list->next) {
 194                 struct ofono_plugin *plugin = list->data;
 195
 196                 if (plugin->active == TRUE && plugin->desc->exit)
 197                         plugin->desc->exit();
 198
 199                 if (plugin->handle)
 200                         dlclose(plugin->handle);
 201
 202                 g_free(plugin);
 203         }
 204
 205         g_slist_free(plugins);
 206 }