daemon/dbus-server.c

   1 /* vi: set et sw=4 ts=4 cino=t0,(0: */
   2 /* -*- Mode: C; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   3 /*
   4  * Copyright (C) 2012 Intel Corporation.
   5  *
   6  * Contact: Amarnath Valluri <amarnath.valluri@linux.intel.com>
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  21  * 02110-1301 USA
  22  */
  23 #include <errno.h>
  24 #include <string.h>
  25 #include <gio/gio.h>
  26 #include <glib/gstdio.h>
  27
  28 #include "config.h"
  29 #include "common/log.h"
  30 #include "dbus-server.h"
  31 #include "dbus-manager.h"
  32
  33
  34 G_DEFINE_TYPE (MsgPortDbusServer, msgport_dbus_server, G_TYPE_OBJECT)
  35
  36
  37 #define MSGPORT_DBUS_SERVER_GET_PRIV(obj) \
  38     G_TYPE_INSTANCE_GET_PRIVATE ((obj), MSGPORT_TYPE_DBUS_SERVER, MsgPortDbusServerPrivate)
  39
  40 enum
  41 {
  42     PROP_0,
  43
  44     PROP_ADDRESS,
  45     N_PROPERTIES
  46 };
  47
  48 static GParamSpec *properties[N_PROPERTIES];
  49
  50 struct _MsgPortDbusServerPrivate
  51 {
  52     GDBusServer    *bus_server;
  53     gchar          *address;
  54     GHashTable     *dbus_managers; /* {GDBusConnection,MsgPortDbusManager} */
  55 };
  56
  57 static void _on_connection_closed (GDBusConnection *connection,
  58                        gboolean         remote_peer_vanished,
  59                        GError          *error,
  60                        gpointer         user_data);
  61
  62 static void
  63 _set_property (GObject *object,
  64         guint property_id,
  65         const GValue *value, GParamSpec *pspec)
  66 {
  67     MsgPortDbusServer *self = MSGPORT_DBUS_SERVER (object);
  68
  69     switch (property_id) {
  70         case PROP_ADDRESS: {
  71             self->priv->address = g_value_dup_string (value);
  72             break;
  73         }
  74         default:
  75             G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
  76     }
  77 }
  78
  79 static void
  80 _get_property (GObject *object,
  81         guint property_id,
  82         GValue *value,
  83         GParamSpec *pspec)
  84 {
  85     MsgPortDbusServer *self = MSGPORT_DBUS_SERVER (object);
  86
  87     switch (property_id) {
  88         case PROP_ADDRESS: {
  89             g_value_set_string (value, g_dbus_server_get_client_address (
  90                     self->priv->bus_server));
  91             break;
  92         }
  93         default:
  94             G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
  95     }
  96 }
  97
  98 static void
  99 _clear_watchers(gpointer connection, gpointer auth_service, gpointer userdata)
 100 {
 101     g_signal_handlers_disconnect_by_func (connection, _on_connection_closed, userdata);
 102 }
 103
 104 static void
 105 _dispose (GObject *object)
 106 {
 107     MsgPortDbusServer *self = MSGPORT_DBUS_SERVER (object);
 108
 109     if (self->priv->bus_server) {
 110         if (g_dbus_server_is_active (self->priv->bus_server))
 111             g_dbus_server_stop (self->priv->bus_server);
 112         g_object_unref (self->priv->bus_server);
 113         self->priv->bus_server = NULL;
 114     }
 115
 116     if (self->priv->dbus_managers) {
 117         g_hash_table_foreach (self->priv->dbus_managers, _clear_watchers, self);
 118         g_hash_table_unref (self->priv->dbus_managers);
 119         self->priv->dbus_managers = NULL;
 120     }
 121
 122     G_OBJECT_CLASS (msgport_dbus_server_parent_class)->dispose (object);
 123 }
 124
 125 static void
 126 _finalize (GObject *object)
 127 {
 128     MsgPortDbusServer *self = MSGPORT_DBUS_SERVER (object);
 129     if (self->priv->address && g_str_has_prefix (self->priv->address, "unix:path=")) {
 130         const gchar *path = g_strstr_len(self->priv->address, -1, "unix:path=") + 10;
 131         if (path) {
 132             g_unlink (path);
 133         }
 134         g_free (self->priv->address);
 135         self->priv->address = NULL;
 136     }
 137
 138     G_OBJECT_CLASS (msgport_dbus_server_parent_class)->finalize (object);
 139 }
 140
 141 static void
 142 msgport_dbus_server_class_init (MsgPortDbusServerClass *klass)
 143 {
 144     GObjectClass* object_class = G_OBJECT_CLASS (klass);
 145
 146     g_type_class_add_private (object_class, sizeof (MsgPortDbusServerPrivate));
 147
 148     object_class->get_property = _get_property;
 149     object_class->set_property = _set_property;
 150     object_class->dispose = _dispose;
 151     object_class->finalize = _finalize;
 152
 153     properties[PROP_ADDRESS] = g_param_spec_string ("address",
 154                                                     "server address",
 155                                                     "Server socket address",
 156                                                     NULL,
 157                                                     G_PARAM_READWRITE |
 158                                                     G_PARAM_CONSTRUCT_ONLY |
 159                                                     G_PARAM_STATIC_STRINGS);
 160
 161     g_object_class_install_properties (object_class, N_PROPERTIES, properties);
 162 }
 163
 164 static void
 165 msgport_dbus_server_init (MsgPortDbusServer *self)
 166 {
 167     self->priv = MSGPORT_DBUS_SERVER_GET_PRIV(self);
 168     self->priv->bus_server = NULL;
 169     self->priv->address = NULL;
 170
 171     self->priv->dbus_managers = g_hash_table_new_full (
 172         g_direct_hash, g_direct_equal, NULL, g_object_unref);
 173 }
 174
 175 const gchar *
 176 msgport_dbus_server_get_address (MsgPortDbusServer *server)
 177 {
 178     g_return_val_if_fail (server || MSGPORT_IS_DBUS_SERVER (server), NULL);
 179
 180     return g_dbus_server_get_client_address (server->priv->bus_server);
 181 }
 182
 183 static void
 184 _on_connection_closed (GDBusConnection *connection,
 185                        gboolean         remote_peer_vanished,
 186                        GError          *error,
 187                        gpointer         user_data)
 188 {
 189     MsgPortDbusServer *server = MSGPORT_DBUS_SERVER (user_data);
 190
 191     g_signal_handlers_disconnect_by_func (connection, _on_connection_closed, user_data);
 192     DBG("dbus connection(%p) closed (peer vanished : %d) : %s",
 193             connection, remote_peer_vanished, error ? error->message : "unknwon reason");
 194
 195     g_hash_table_remove (server->priv->dbus_managers, connection);
 196 }
 197
 198 void
 199 msgport_dbus_server_start_dbus_manager_for_connection (
 200     MsgPortDbusServer *server,
 201     GDBusConnection *connection)
 202 {
 203     MsgPortDbusManager *dbus_manager = NULL;
 204     GError *error = NULL;
 205
 206     DBG("Starting dbus manager on connection %p", connection);
 207
 208     dbus_manager = msgport_dbus_manager_new (
 209         connection, server, &error);
 210     if (!dbus_manager) {
 211         WARN ("Could not create dbus manager on conneciton %p: %s", connection, error->message);
 212         g_error_free (error);
 213         return;
 214     }
 215
 216     g_hash_table_insert (server->priv->dbus_managers, connection, dbus_manager);
 217
 218     g_signal_connect (connection, "closed", G_CALLBACK(_on_connection_closed), server);
 219 }
 220
 221 static gboolean
 222 _on_client_request (GDBusServer *dbus_server, GDBusConnection *connection, gpointer userdata)
 223 {
 224     MsgPortDbusServer *server = MSGPORT_DBUS_SERVER(userdata);
 225
 226     g_return_val_if_fail (server && MSGPORT_IS_DBUS_SERVER (server), FALSE);
 227
 228     msgport_dbus_server_start_dbus_manager_for_connection (server, connection);
 229
 230     return TRUE;
 231 }
 232
 233 MsgPortDbusServer * msgport_dbus_server_new_with_address (const gchar *address)
 234 {
 235     GError *err = NULL;
 236     gchar *guid = 0;
 237     const gchar *file_path = NULL;
 238     MsgPortDbusServer *server = MSGPORT_DBUS_SERVER (
 239         g_object_new (MSGPORT_TYPE_DBUS_SERVER, "address", address, NULL));
 240
 241     if (!server) return NULL;
 242
 243     if (g_str_has_prefix(address, "unix:path=")) {
 244         file_path = g_strstr_len (address, -1, "unix:path=") + 10;
 245
 246         if (g_file_test(file_path, G_FILE_TEST_EXISTS)) {
 247             g_unlink (file_path);
 248         }
 249         else {
 250             gchar *base_path = g_path_get_dirname (file_path);
 251             if (g_mkdir_with_parents (base_path, S_IRUSR | S_IWUSR | S_IXUSR) == -1) {
 252                 WARN ("Could not create '%s', error: %s", base_path, strerror(errno));
 253             }
 254             g_free (base_path);
 255         }
 256     }
 257
 258     guid = g_dbus_generate_guid ();
 259
 260     server->priv->bus_server = g_dbus_server_new_sync (server->priv->address,
 261             G_DBUS_SERVER_FLAGS_NONE, guid, NULL, NULL, &err);
 262
 263     g_free (guid);
 264
 265     if (!server->priv->bus_server) {
 266         ERR ("failed to start server at address '%s':%s", server->priv->address,
 267                  err->message);
 268         g_error_free (err);
 269
 270         g_object_unref (server);
 271
 272         return NULL;
 273     }
 274
 275     g_signal_connect (server->priv->bus_server, "new-connection", G_CALLBACK(_on_client_request), server);
 276
 277     g_dbus_server_start (server->priv->bus_server);
 278
 279     if (file_path)
 280         g_chmod (file_path, S_IRUSR | S_IWUSR);
 281
 282     return server;
 283 }
 284
 285 MsgPortDbusServer *
 286 msgport_dbus_server_new () {
 287         MsgPortDbusServer *server = NULL;
 288         gchar *address = NULL;
 289
 290     if (g_getenv("MESSAGEPORT_BUS_ADDRESS")) {
 291         address = g_strdup (g_getenv ("MESSAGEPORT_BUS_ADDRESS"));
 292     }
 293     else {
 294 #       ifdef MESSAGEPORT_BUS_ADDRESS
 295            address = g_strdup_printf (MESSAGEPORT_BUS_ADDRESS);
 296 #       endif
 297     }
 298     if (!address)
 299         address = g_strdup_printf ("unix:path=%s/.message-port", g_get_user_runtime_dir());
 300
 301     server = msgport_dbus_server_new_with_address (address);
 302     g_free (address);
 303
 304     return server ;
 305 }
 306
 307 static gboolean
 308 _find_dbus_manager_by_app_id (
 309     GDBusConnection *key,
 310     MsgPortDbusManager *value,
 311     const gchar *app_id_to_find)
 312 {
 313     return !g_strcmp0 (msgport_dbus_manager_get_app_id (value), app_id_to_find);
 314 }
 315
 316 MsgPortDbusManager *
 317 msgport_dbus_server_get_dbus_manager_by_app_id (MsgPortDbusServer *server, const gchar *app_id)
 318 {
 319     g_return_val_if_fail (server && MSGPORT_IS_DBUS_SERVER (server), NULL);
 320
 321     return (MsgPortDbusManager *)g_hash_table_find (server->priv->dbus_managers,
 322             (GHRFunc)_find_dbus_manager_by_app_id, (gpointer)app_id);
 323 }
 324