gio/gsocketconnection.c

   1 /* GIO - GLib Input, Output and Streaming Library
   2  *
   3  * Copyright © 2008 Christian Kellner, Samuel Cormier-Iijima
   4  *           © 2008 codethink
   5  * Copyright © 2009 Red Hat, Inc
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General
  18  * Public License along with this library; if not, write to the
  19  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  20  * Boston, MA 02111-1307, USA.
  21  *
  22  * Authors: Christian Kellner <gicmo@gnome.org>
  23  *          Samuel Cormier-Iijima <sciyoshi@gmail.com>
  24  *          Ryan Lortie <desrt@desrt.ca>
  25  *          Alexander Larsson <alexl@redhat.com>
  26  */
  27
  28 #include "config.h"
  29
  30 #include "gsocketconnection.h"
  31
  32 #include "gsocketoutputstream.h"
  33 #include "gsocketinputstream.h"
  34 #include <gio/giostream.h>
  35 #include <gio/gsimpleasyncresult.h>
  36 #include "gunixconnection.h"
  37 #include "gtcpconnection.h"
  38 #include "glibintl.h"
  39
  40
  41 /**
  42  * SECTION:gsocketconnection
  43  * @short_description: A socket connection
  44  * @include: gio/gio.h
  45  * @see_also: #GIOStream, #GSocketClient, #GSocketListener
  46  *
  47  * #GSocketConnection is a #GIOStream for a connected socket. They
  48  * can be created either by #GSocketClient when connecting to a host,
  49  * or by #GSocketListener when accepting a new client.
  50  *
  51  * The type of the #GSocketConnection object returned from these calls
  52  * depends on the type of the underlying socket that is in use. For
  53  * instance, for a TCP/IP connection it will be a #GTcpConnection.
  54  *
  55  * Choosing what type of object to construct is done with the socket
  56  * connection factory, and it is possible for 3rd parties to register
  57  * custom socket connection types for specific combination of socket
  58  * family/type/protocol using g_socket_connection_factory_register_type().
  59  *
  60  * Since: 2.22
  61  */
  62
  63 G_DEFINE_TYPE (GSocketConnection, g_socket_connection, G_TYPE_IO_STREAM);
  64
  65 enum
  66 {
  67   PROP_NONE,
  68   PROP_SOCKET,
  69 };
  70
  71 struct _GSocketConnectionPrivate
  72 {
  73   GSocket       *socket;
  74   GInputStream  *input_stream;
  75   GOutputStream *output_stream;
  76
  77   gboolean       in_dispose;
  78 };
  79
  80 static gboolean g_socket_connection_close         (GIOStream            *stream,
  81                                                    GCancellable         *cancellable,
  82                                                    GError              **error);
  83 static void     g_socket_connection_close_async   (GIOStream            *stream,
  84                                                    int                   io_priority,
  85                                                    GCancellable         *cancellable,
  86                                                    GAsyncReadyCallback   callback,
  87                                                    gpointer              user_data);
  88 static gboolean g_socket_connection_close_finish  (GIOStream            *stream,
  89                                                    GAsyncResult         *result,
  90                                                    GError              **error);
  91
  92 static GInputStream *
  93 g_socket_connection_get_input_stream (GIOStream *io_stream)
  94 {
  95   GSocketConnection *connection = G_SOCKET_CONNECTION (io_stream);
  96
  97   if (connection->priv->input_stream == NULL)
  98     connection->priv->input_stream = (GInputStream *)
  99       _g_socket_input_stream_new (connection->priv->socket);
 100
 101   return connection->priv->input_stream;
 102 }
 103
 104 static GOutputStream *
 105 g_socket_connection_get_output_stream (GIOStream *io_stream)
 106 {
 107   GSocketConnection *connection = G_SOCKET_CONNECTION (io_stream);
 108
 109   if (connection->priv->output_stream == NULL)
 110     connection->priv->output_stream = (GOutputStream *)
 111       _g_socket_output_stream_new (connection->priv->socket);
 112
 113   return connection->priv->output_stream;
 114 }
 115
 116 /**
 117  * g_socket_connection_get_socket:
 118  * @connection: a #GSocketConnection
 119  *
 120  * Gets the underlying #GSocket object of the connection.
 121  * This can be useful if you want to do something unusual on it
 122  * not supported by the #GSocketConnection APIs.
 123  *
 124  * Returns: (transfer none): a #GSocketAddress or %NULL on error.
 125  *
 126  * Since: 2.22
 127  */
 128 GSocket *
 129 g_socket_connection_get_socket (GSocketConnection *connection)
 130 {
 131   g_return_val_if_fail (G_IS_SOCKET_CONNECTION (connection), NULL);
 132
 133   return connection->priv->socket;
 134 }
 135
 136 /**
 137  * g_socket_connection_get_local_address:
 138  * @connection: a #GSocketConnection
 139  * @error: #GError for error reporting, or %NULL to ignore.
 140  *
 141  * Try to get the local address of a socket connection.
 142  *
 143  * Returns: (transfer full): a #GSocketAddress or %NULL on error.
 144  *     Free the returned object with g_object_unref().
 145  *
 146  * Since: 2.22
 147  */
 148 GSocketAddress *
 149 g_socket_connection_get_local_address (GSocketConnection  *connection,
 150                                        GError            **error)
 151 {
 152   return g_socket_get_local_address (connection->priv->socket, error);
 153 }
 154
 155 /**
 156  * g_socket_connection_get_remote_address:
 157  * @connection: a #GSocketConnection
 158  * @error: #GError for error reporting, or %NULL to ignore.
 159  *
 160  * Try to get the remote address of a socket connection.
 161  *
 162  * Returns: (transfer full): a #GSocketAddress or %NULL on error.
 163  *     Free the returned object with g_object_unref().
 164  *
 165  * Since: 2.22
 166  */
 167 GSocketAddress *
 168 g_socket_connection_get_remote_address (GSocketConnection  *connection,
 169                                         GError            **error)
 170 {
 171   return g_socket_get_remote_address (connection->priv->socket, error);
 172 }
 173
 174 static void
 175 g_socket_connection_get_property (GObject    *object,
 176                                   guint       prop_id,
 177                                   GValue     *value,
 178                                   GParamSpec *pspec)
 179 {
 180   GSocketConnection *connection = G_SOCKET_CONNECTION (object);
 181
 182   switch (prop_id)
 183     {
 184      case PROP_SOCKET:
 185       g_value_set_object (value, connection->priv->socket);
 186       break;
 187
 188      default:
 189       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 190     }
 191 }
 192
 193 static void
 194 g_socket_connection_set_property (GObject      *object,
 195                                   guint         prop_id,
 196                                   const GValue *value,
 197                                   GParamSpec   *pspec)
 198 {
 199   GSocketConnection *connection = G_SOCKET_CONNECTION (object);
 200
 201   switch (prop_id)
 202     {
 203      case PROP_SOCKET:
 204       connection->priv->socket = G_SOCKET (g_value_dup_object (value));
 205       break;
 206
 207      default:
 208       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 209     }
 210 }
 211
 212 static void
 213 g_socket_connection_constructed (GObject *object)
 214 {
 215   GSocketConnection *connection = G_SOCKET_CONNECTION (object);
 216
 217   g_assert (connection->priv->socket != NULL);
 218 }
 219
 220 static void
 221 g_socket_connection_dispose (GObject *object)
 222 {
 223   GSocketConnection *connection = G_SOCKET_CONNECTION (object);
 224
 225   connection->priv->in_dispose = TRUE;
 226
 227   G_OBJECT_CLASS (g_socket_connection_parent_class)
 228     ->dispose (object);
 229
 230   connection->priv->in_dispose = FALSE;
 231 }
 232
 233 static void
 234 g_socket_connection_finalize (GObject *object)
 235 {
 236   GSocketConnection *connection = G_SOCKET_CONNECTION (object);
 237
 238   if (connection->priv->input_stream)
 239     g_object_unref (connection->priv->input_stream);
 240
 241   if (connection->priv->output_stream)
 242     g_object_unref (connection->priv->output_stream);
 243
 244   g_object_unref (connection->priv->socket);
 245
 246   G_OBJECT_CLASS (g_socket_connection_parent_class)
 247     ->finalize (object);
 248 }
 249
 250 static void
 251 g_socket_connection_class_init (GSocketConnectionClass *klass)
 252 {
 253   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 254   GIOStreamClass *stream_class = G_IO_STREAM_CLASS (klass);
 255
 256   g_type_class_add_private (klass, sizeof (GSocketConnectionPrivate));
 257
 258   gobject_class->set_property = g_socket_connection_set_property;
 259   gobject_class->get_property = g_socket_connection_get_property;
 260   gobject_class->constructed = g_socket_connection_constructed;
 261   gobject_class->finalize = g_socket_connection_finalize;
 262   gobject_class->dispose = g_socket_connection_dispose;
 263
 264   stream_class->get_input_stream = g_socket_connection_get_input_stream;
 265   stream_class->get_output_stream = g_socket_connection_get_output_stream;
 266   stream_class->close_fn = g_socket_connection_close;
 267   stream_class->close_async = g_socket_connection_close_async;
 268   stream_class->close_finish = g_socket_connection_close_finish;
 269
 270   g_object_class_install_property (gobject_class,
 271                                    PROP_SOCKET,
 272                                    g_param_spec_object ("socket",
 273                                                         P_("Socket"),
 274                                                         P_("The underlying GSocket"),
 275                                                         G_TYPE_SOCKET,
 276                                                         G_PARAM_CONSTRUCT_ONLY |
 277                                                         G_PARAM_READWRITE |
 278                                                         G_PARAM_STATIC_STRINGS));
 279 }
 280
 281 static void
 282 g_socket_connection_init (GSocketConnection *connection)
 283 {
 284   connection->priv = G_TYPE_INSTANCE_GET_PRIVATE (connection,
 285                                                   G_TYPE_SOCKET_CONNECTION,
 286                                                   GSocketConnectionPrivate);
 287 }
 288
 289 static gboolean
 290 g_socket_connection_close (GIOStream     *stream,
 291                            GCancellable  *cancellable,
 292                            GError       **error)
 293 {
 294   GSocketConnection *connection = G_SOCKET_CONNECTION (stream);
 295
 296   if (connection->priv->output_stream)
 297     g_output_stream_close (connection->priv->output_stream,
 298                            cancellable, NULL);
 299   if (connection->priv->input_stream)
 300     g_input_stream_close (connection->priv->input_stream,
 301                           cancellable, NULL);
 302
 303   /* Don't close the underlying socket if this is being called
 304    * as part of dispose(); when destroying the GSocketConnection,
 305    * we only want to close the socket if we're holding the last
 306    * reference on it, and in that case it will close itself when
 307    * we unref it in finalize().
 308    */
 309   if (connection->priv->in_dispose)
 310     return TRUE;
 311
 312   return g_socket_close (connection->priv->socket, error);
 313 }
 314
 315
 316 static void
 317 g_socket_connection_close_async (GIOStream           *stream,
 318                                  int                  io_priority,
 319                                  GCancellable        *cancellable,
 320                                  GAsyncReadyCallback  callback,
 321                                  gpointer             user_data)
 322 {
 323   GSimpleAsyncResult *res;
 324   GIOStreamClass *class;
 325   GError *error;
 326
 327   class = G_IO_STREAM_GET_CLASS (stream);
 328
 329   /* socket close is not blocked, just do it! */
 330   error = NULL;
 331   if (class->close_fn &&
 332       !class->close_fn (stream, cancellable, &error))
 333     {
 334       g_simple_async_report_take_gerror_in_idle (G_OBJECT (stream),
 335                                             callback, user_data,
 336                                             error);
 337       return;
 338     }
 339
 340   res = g_simple_async_result_new (G_OBJECT (stream),
 341                                    callback,
 342                                    user_data,
 343                                    g_socket_connection_close_async);
 344   g_simple_async_result_complete_in_idle (res);
 345   g_object_unref (res);
 346 }
 347
 348 static gboolean
 349 g_socket_connection_close_finish (GIOStream     *stream,
 350                                   GAsyncResult  *result,
 351                                   GError       **error)
 352 {
 353   return TRUE;
 354 }
 355
 356 typedef struct {
 357   GSocketFamily socket_family;
 358   GSocketType socket_type;
 359   int protocol;
 360   GType implementation;
 361 } ConnectionFactory;
 362
 363 static guint
 364 connection_factory_hash (gconstpointer key)
 365 {
 366   const ConnectionFactory *factory = key;
 367   guint h;
 368
 369   h = factory->socket_family ^ (factory->socket_type << 4) ^ (factory->protocol << 8);
 370   /* This is likely to be small, so spread over whole
 371      hash space to get some distribution */
 372   h = h ^ (h << 8) ^ (h << 16) ^ (h << 24);
 373
 374   return h;
 375 }
 376
 377 static gboolean
 378 connection_factory_equal (gconstpointer _a,
 379                           gconstpointer _b)
 380 {
 381   const ConnectionFactory *a = _a;
 382   const ConnectionFactory *b = _b;
 383
 384   if (a->socket_family != b->socket_family)
 385     return FALSE;
 386
 387   if (a->socket_type != b->socket_type)
 388     return FALSE;
 389
 390   if (a->protocol != b->protocol)
 391     return FALSE;
 392
 393   return TRUE;
 394 }
 395
 396 static GHashTable *connection_factories = NULL;
 397 G_LOCK_DEFINE_STATIC(connection_factories);
 398
 399 /**
 400  * g_socket_connection_factory_register_type:
 401  * @g_type: a #GType, inheriting from %G_TYPE_SOCKET_CONNECTION
 402  * @family: a #GSocketFamily
 403  * @type: a #GSocketType
 404  * @protocol: a protocol id
 405  *
 406  * Looks up the #GType to be used when creating socket connections on
 407  * sockets with the specified @family, @type and @protocol.
 408  *
 409  * If no type is registered, the #GSocketConnection base type is returned.
 410  *
 411  * Since: 2.22
 412  */
 413 void
 414 g_socket_connection_factory_register_type (GType         g_type,
 415                                            GSocketFamily family,
 416                                            GSocketType   type,
 417                                            gint          protocol)
 418 {
 419   ConnectionFactory *factory;
 420
 421   g_return_if_fail (g_type_is_a (g_type, G_TYPE_SOCKET_CONNECTION));
 422
 423   G_LOCK (connection_factories);
 424
 425   if (connection_factories == NULL)
 426     connection_factories = g_hash_table_new_full (connection_factory_hash,
 427                                                   connection_factory_equal,
 428                                                   (GDestroyNotify)g_free,
 429                                                   NULL);
 430
 431   factory = g_new0 (ConnectionFactory, 1);
 432   factory->socket_family = family;
 433   factory->socket_type = type;
 434   factory->protocol = protocol;
 435   factory->implementation = g_type;
 436
 437   g_hash_table_insert (connection_factories,
 438                        factory, factory);
 439
 440   G_UNLOCK (connection_factories);
 441 }
 442
 443 static void
 444 init_builtin_types (void)
 445 {
 446   volatile GType a_type;
 447 #ifndef G_OS_WIN32
 448   a_type = g_unix_connection_get_type ();
 449 #endif
 450   a_type = g_tcp_connection_get_type ();
 451   (a_type); /* To avoid -Wunused-but-set-variable */
 452 }
 453
 454 /**
 455  * g_socket_connection_factory_lookup_type:
 456  * @family: a #GSocketFamily
 457  * @type: a #GSocketType
 458  * @protocol_id: a protocol id
 459  *
 460  * Looks up the #GType to be used when creating socket connections on
 461  * sockets with the specified @family, @type and @protocol_id.
 462  *
 463  * If no type is registered, the #GSocketConnection base type is returned.
 464  *
 465  * Returns: a #GType
 466  *
 467  * Since: 2.22
 468  */
 469 GType
 470 g_socket_connection_factory_lookup_type (GSocketFamily family,
 471                                          GSocketType   type,
 472                                          gint          protocol_id)
 473 {
 474   ConnectionFactory *factory, key;
 475   GType g_type;
 476
 477   init_builtin_types ();
 478
 479   G_LOCK (connection_factories);
 480
 481   g_type = G_TYPE_SOCKET_CONNECTION;
 482
 483   if (connection_factories)
 484     {
 485       key.socket_family = family;
 486       key.socket_type = type;
 487       key.protocol = protocol_id;
 488
 489       factory = g_hash_table_lookup (connection_factories, &key);
 490       if (factory)
 491         g_type = factory->implementation;
 492     }
 493
 494   G_UNLOCK (connection_factories);
 495
 496   return g_type;
 497 }
 498
 499 /**
 500  * g_socket_connection_factory_create_connection:
 501  * @socket: a #GSocket
 502  *
 503  * Creates a #GSocketConnection subclass of the right type for
 504  * @socket.
 505  *
 506  * Returns: (transfer full): a #GSocketConnection
 507  *
 508  * Since: 2.22
 509  */
 510 GSocketConnection *
 511 g_socket_connection_factory_create_connection (GSocket *socket)
 512 {
 513   GType type;
 514
 515   type = g_socket_connection_factory_lookup_type (g_socket_get_family (socket),
 516                                                   g_socket_get_socket_type (socket),
 517                                                   g_socket_get_protocol (socket));
 518   return g_object_new (type, "socket", socket, NULL);
 519 }