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 "gioprivate.h"
  35 #include <gio/giostream.h>
  36 #include <gio/gtask.h>
  37 #include "gunixconnection.h"
  38 #include "gtcpconnection.h"
  39 #include "glibintl.h"
  40
  41
  42 /**
  43  * SECTION:gsocketconnection
  44  * @short_description: A socket connection
  45  * @include: gio/gio.h
  46  * @see_also: #GIOStream, #GSocketClient, #GSocketListener
  47  *
  48  * #GSocketConnection is a #GIOStream for a connected socket. They
  49  * can be created either by #GSocketClient when connecting to a host,
  50  * or by #GSocketListener when accepting a new client.
  51  *
  52  * The type of the #GSocketConnection object returned from these calls
  53  * depends on the type of the underlying socket that is in use. For
  54  * instance, for a TCP/IP connection it will be a #GTcpConnection.
  55  *
  56  * Choosing what type of object to construct is done with the socket
  57  * connection factory, and it is possible for 3rd parties to register
  58  * custom socket connection types for specific combination of socket
  59  * family/type/protocol using g_socket_connection_factory_register_type().
  60  *
  61  * Since: 2.22
  62  */
  63
  64 enum
  65 {
  66   PROP_NONE,
  67   PROP_SOCKET,
  68 };
  69
  70 struct _GSocketConnectionPrivate
  71 {
  72   GSocket       *socket;
  73   GInputStream  *input_stream;
  74   GOutputStream *output_stream;
  75
  76   GSocketAddress *cached_remote_address;
  77
  78   gboolean       in_dispose;
  79 };
  80
  81 static gboolean g_socket_connection_close         (GIOStream            *stream,
  82                                                    GCancellable         *cancellable,
  83                                                    GError              **error);
  84 static void     g_socket_connection_close_async   (GIOStream            *stream,
  85                                                    int                   io_priority,
  86                                                    GCancellable         *cancellable,
  87                                                    GAsyncReadyCallback   callback,
  88                                                    gpointer              user_data);
  89 static gboolean g_socket_connection_close_finish  (GIOStream            *stream,
  90                                                    GAsyncResult         *result,
  91                                                    GError              **error);
  92
  93 G_DEFINE_TYPE_WITH_PRIVATE (GSocketConnection, g_socket_connection, G_TYPE_IO_STREAM)
  94
  95 static GInputStream *
  96 g_socket_connection_get_input_stream (GIOStream *io_stream)
  97 {
  98   GSocketConnection *connection = G_SOCKET_CONNECTION (io_stream);
  99
 100   if (connection->priv->input_stream == NULL)
 101     connection->priv->input_stream = (GInputStream *)
 102       _g_socket_input_stream_new (connection->priv->socket);
 103
 104   return connection->priv->input_stream;
 105 }
 106
 107 static GOutputStream *
 108 g_socket_connection_get_output_stream (GIOStream *io_stream)
 109 {
 110   GSocketConnection *connection = G_SOCKET_CONNECTION (io_stream);
 111
 112   if (connection->priv->output_stream == NULL)
 113     connection->priv->output_stream = (GOutputStream *)
 114       _g_socket_output_stream_new (connection->priv->socket);
 115
 116   return connection->priv->output_stream;
 117 }
 118
 119 /**
 120  * g_socket_connection_is_connected:
 121  * @connection: a #GSocketConnection
 122  *
 123  * Checks if @connection is connected. This is equivalent to calling
 124  * g_socket_is_connected() on @connection's underlying #GSocket.
 125  *
 126  * Returns: whether @connection is connected
 127  *
 128  * Since: 2.32
 129  */
 130 gboolean
 131 g_socket_connection_is_connected (GSocketConnection  *connection)
 132 {
 133   return g_socket_is_connected (connection->priv->socket);
 134 }
 135
 136 /**
 137  * g_socket_connection_connect:
 138  * @connection: a #GSocketConnection
 139  * @address: a #GSocketAddress specifying the remote address.
 140  * @cancellable: (allow-none): a %GCancellable or %NULL
 141  * @error: #GError for error reporting, or %NULL to ignore.
 142  *
 143  * Connect @connection to the specified remote address.
 144  *
 145  * Returns: %TRUE if the connection succeeded, %FALSE on error
 146  *
 147  * Since: 2.32
 148  */
 149 gboolean
 150 g_socket_connection_connect (GSocketConnection  *connection,
 151                              GSocketAddress     *address,
 152                              GCancellable       *cancellable,
 153                              GError            **error)
 154 {
 155   g_return_val_if_fail (G_IS_SOCKET_CONNECTION (connection), FALSE);
 156   g_return_val_if_fail (G_IS_SOCKET_ADDRESS (address), FALSE);
 157
 158   return g_socket_connect (connection->priv->socket, address,
 159                            cancellable, error);
 160 }
 161
 162 static gboolean g_socket_connection_connect_callback (GSocket      *socket,
 163                                                       GIOCondition  condition,
 164                                                       gpointer      user_data);
 165
 166 /**
 167  * g_socket_connection_connect_async:
 168  * @connection: a #GSocketConnection
 169  * @address: a #GSocketAddress specifying the remote address.
 170  * @cancellable: (allow-none): a %GCancellable or %NULL
 171  * @callback: (scope async): a #GAsyncReadyCallback
 172  * @user_data: (closure): user data for the callback
 173  *
 174  * Asynchronously connect @connection to the specified remote address.
 175  *
 176  * This clears the #GSocket:blocking flag on @connection's underlying
 177  * socket if it is currently set.
 178  *
 179  * Use g_socket_connection_connect_finish() to retrieve the result.
 180  *
 181  * Since: 2.32
 182  */
 183 void
 184 g_socket_connection_connect_async (GSocketConnection   *connection,
 185                                    GSocketAddress      *address,
 186                                    GCancellable        *cancellable,
 187                                    GAsyncReadyCallback  callback,
 188                                    gpointer             user_data)
 189 {
 190   GTask *task;
 191   GError *tmp_error = NULL;
 192
 193   g_return_if_fail (G_IS_SOCKET_CONNECTION (connection));
 194   g_return_if_fail (G_IS_SOCKET_ADDRESS (address));
 195
 196   task = g_task_new (connection, cancellable, callback, user_data);
 197
 198   g_socket_set_blocking (connection->priv->socket, FALSE);
 199
 200   if (g_socket_connect (connection->priv->socket, address,
 201                         cancellable, &tmp_error))
 202     {
 203       g_task_return_boolean (task, TRUE);
 204       g_object_unref (task);
 205     }
 206   else if (g_error_matches (tmp_error, G_IO_ERROR, G_IO_ERROR_PENDING))
 207     {
 208       GSource *source;
 209
 210       g_error_free (tmp_error);
 211       source = g_socket_create_source (connection->priv->socket,
 212                                        G_IO_OUT, cancellable);
 213       g_task_attach_source (task, source,
 214                             (GSourceFunc) g_socket_connection_connect_callback);
 215       g_source_unref (source);
 216     }
 217   else
 218     {
 219       g_task_return_error (task, tmp_error);
 220       g_object_unref (task);
 221     }
 222 }
 223
 224 static gboolean
 225 g_socket_connection_connect_callback (GSocket      *socket,
 226                                       GIOCondition  condition,
 227                                       gpointer      user_data)
 228 {
 229   GTask *task = user_data;
 230   GSocketConnection *connection = g_task_get_source_object (task);
 231   GError *error = NULL;
 232
 233   if (g_socket_check_connect_result (connection->priv->socket, &error))
 234     g_task_return_boolean (task, TRUE);
 235   else
 236     g_task_return_error (task, error);
 237
 238   g_object_unref (task);
 239   return FALSE;
 240 }
 241
 242 /**
 243  * g_socket_connection_connect_finish:
 244  * @connection: a #GSocketConnection
 245  * @result: the #GAsyncResult
 246  * @error: #GError for error reporting, or %NULL to ignore.
 247  *
 248  * Gets the result of a g_socket_connection_connect_async() call.
 249  *
 250  * Returns: %TRUE if the connection succeeded, %FALSE on error
 251  *
 252  * Since: 2.32
 253  */
 254 gboolean
 255 g_socket_connection_connect_finish (GSocketConnection  *connection,
 256                                     GAsyncResult       *result,
 257                                     GError            **error)
 258 {
 259   g_return_val_if_fail (G_IS_SOCKET_CONNECTION (connection), FALSE);
 260   g_return_val_if_fail (g_task_is_valid (result, connection), FALSE);
 261
 262   return g_task_propagate_boolean (G_TASK (result), error);
 263 }
 264
 265 /**
 266  * g_socket_connection_get_socket:
 267  * @connection: a #GSocketConnection
 268  *
 269  * Gets the underlying #GSocket object of the connection.
 270  * This can be useful if you want to do something unusual on it
 271  * not supported by the #GSocketConnection APIs.
 272  *
 273  * Returns: (transfer none): a #GSocketAddress or %NULL on error.
 274  *
 275  * Since: 2.22
 276  */
 277 GSocket *
 278 g_socket_connection_get_socket (GSocketConnection *connection)
 279 {
 280   g_return_val_if_fail (G_IS_SOCKET_CONNECTION (connection), NULL);
 281
 282   return connection->priv->socket;
 283 }
 284
 285 /**
 286  * g_socket_connection_get_local_address:
 287  * @connection: a #GSocketConnection
 288  * @error: #GError for error reporting, or %NULL to ignore.
 289  *
 290  * Try to get the local address of a socket connection.
 291  *
 292  * Returns: (transfer full): a #GSocketAddress or %NULL on error.
 293  *     Free the returned object with g_object_unref().
 294  *
 295  * Since: 2.22
 296  */
 297 GSocketAddress *
 298 g_socket_connection_get_local_address (GSocketConnection  *connection,
 299                                        GError            **error)
 300 {
 301   return g_socket_get_local_address (connection->priv->socket, error);
 302 }
 303
 304 /**
 305  * g_socket_connection_get_remote_address:
 306  * @connection: a #GSocketConnection
 307  * @error: #GError for error reporting, or %NULL to ignore.
 308  *
 309  * Try to get the remote address of a socket connection.
 310  *
 311  * Since GLib 2.40, when used with g_socket_client_connect() or
 312  * g_socket_client_connect_async(), during emission of
 313  * %G_SOCKET_CLIENT_CONNECTING, this function will return the remote
 314  * address that will be used for the connection.  This allows
 315  * applications to print e.g. "Connecting to example.com
 316  * (10.42.77.3)...".
 317  *
 318  * Returns: (transfer full): a #GSocketAddress or %NULL on error.
 319  *     Free the returned object with g_object_unref().
 320  *
 321  * Since: 2.22
 322  */
 323 GSocketAddress *
 324 g_socket_connection_get_remote_address (GSocketConnection  *connection,
 325                                         GError            **error)
 326 {
 327   if (!g_socket_is_connected (connection->priv->socket))
 328     {
 329       return connection->priv->cached_remote_address ?
 330         g_object_ref (connection->priv->cached_remote_address) : NULL;
 331     }
 332   return g_socket_get_remote_address (connection->priv->socket, error);
 333 }
 334
 335 /* Private API allowing applications to retrieve the resolved address
 336  * now, before we start connecting.
 337  *
 338  * https://bugzilla.gnome.org/show_bug.cgi?id=712547
 339  */
 340 void
 341 g_socket_connection_set_cached_remote_address (GSocketConnection *connection,
 342                                                GSocketAddress    *address)
 343 {
 344   g_clear_object (&connection->priv->cached_remote_address);
 345   connection->priv->cached_remote_address = address ? g_object_ref (address) : NULL;
 346 }
 347
 348 static void
 349 g_socket_connection_get_property (GObject    *object,
 350                                   guint       prop_id,
 351                                   GValue     *value,
 352                                   GParamSpec *pspec)
 353 {
 354   GSocketConnection *connection = G_SOCKET_CONNECTION (object);
 355
 356   switch (prop_id)
 357     {
 358      case PROP_SOCKET:
 359       g_value_set_object (value, connection->priv->socket);
 360       break;
 361
 362      default:
 363       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 364     }
 365 }
 366
 367 static void
 368 g_socket_connection_set_property (GObject      *object,
 369                                   guint         prop_id,
 370                                   const GValue *value,
 371                                   GParamSpec   *pspec)
 372 {
 373   GSocketConnection *connection = G_SOCKET_CONNECTION (object);
 374
 375   switch (prop_id)
 376     {
 377      case PROP_SOCKET:
 378       connection->priv->socket = G_SOCKET (g_value_dup_object (value));
 379       break;
 380
 381      default:
 382       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 383     }
 384 }
 385
 386 static void
 387 g_socket_connection_constructed (GObject *object)
 388 {
 389   GSocketConnection *connection = G_SOCKET_CONNECTION (object);
 390
 391   g_assert (connection->priv->socket != NULL);
 392 }
 393
 394 static void
 395 g_socket_connection_dispose (GObject *object)
 396 {
 397   GSocketConnection *connection = G_SOCKET_CONNECTION (object);
 398
 399   connection->priv->in_dispose = TRUE;
 400
 401   g_clear_object (&connection->priv->cached_remote_address);
 402
 403   G_OBJECT_CLASS (g_socket_connection_parent_class)
 404     ->dispose (object);
 405
 406   connection->priv->in_dispose = FALSE;
 407 }
 408
 409 static void
 410 g_socket_connection_finalize (GObject *object)
 411 {
 412   GSocketConnection *connection = G_SOCKET_CONNECTION (object);
 413
 414   if (connection->priv->input_stream)
 415     g_object_unref (connection->priv->input_stream);
 416
 417   if (connection->priv->output_stream)
 418     g_object_unref (connection->priv->output_stream);
 419
 420   g_object_unref (connection->priv->socket);
 421
 422   G_OBJECT_CLASS (g_socket_connection_parent_class)
 423     ->finalize (object);
 424 }
 425
 426 static void
 427 g_socket_connection_class_init (GSocketConnectionClass *klass)
 428 {
 429   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 430   GIOStreamClass *stream_class = G_IO_STREAM_CLASS (klass);
 431
 432   gobject_class->set_property = g_socket_connection_set_property;
 433   gobject_class->get_property = g_socket_connection_get_property;
 434   gobject_class->constructed = g_socket_connection_constructed;
 435   gobject_class->finalize = g_socket_connection_finalize;
 436   gobject_class->dispose = g_socket_connection_dispose;
 437
 438   stream_class->get_input_stream = g_socket_connection_get_input_stream;
 439   stream_class->get_output_stream = g_socket_connection_get_output_stream;
 440   stream_class->close_fn = g_socket_connection_close;
 441   stream_class->close_async = g_socket_connection_close_async;
 442   stream_class->close_finish = g_socket_connection_close_finish;
 443
 444   g_object_class_install_property (gobject_class,
 445                                    PROP_SOCKET,
 446                                    g_param_spec_object ("socket",
 447                                                         P_("Socket"),
 448                                                         P_("The underlying GSocket"),
 449                                                         G_TYPE_SOCKET,
 450                                                         G_PARAM_CONSTRUCT_ONLY |
 451                                                         G_PARAM_READWRITE |
 452                                                         G_PARAM_STATIC_STRINGS));
 453 }
 454
 455 static void
 456 g_socket_connection_init (GSocketConnection *connection)
 457 {
 458   connection->priv = g_socket_connection_get_instance_private (connection);
 459 }
 460
 461 static gboolean
 462 g_socket_connection_close (GIOStream     *stream,
 463                            GCancellable  *cancellable,
 464                            GError       **error)
 465 {
 466   GSocketConnection *connection = G_SOCKET_CONNECTION (stream);
 467
 468   if (connection->priv->output_stream)
 469     g_output_stream_close (connection->priv->output_stream,
 470                            cancellable, NULL);
 471   if (connection->priv->input_stream)
 472     g_input_stream_close (connection->priv->input_stream,
 473                           cancellable, NULL);
 474
 475   /* Don't close the underlying socket if this is being called
 476    * as part of dispose(); when destroying the GSocketConnection,
 477    * we only want to close the socket if we're holding the last
 478    * reference on it, and in that case it will close itself when
 479    * we unref it in finalize().
 480    */
 481   if (connection->priv->in_dispose)
 482     return TRUE;
 483
 484   return g_socket_close (connection->priv->socket, error);
 485 }
 486
 487
 488 static void
 489 g_socket_connection_close_async (GIOStream           *stream,
 490                                  int                  io_priority,
 491                                  GCancellable        *cancellable,
 492                                  GAsyncReadyCallback  callback,
 493                                  gpointer             user_data)
 494 {
 495   GTask *task;
 496   GIOStreamClass *class;
 497   GError *error;
 498
 499   class = G_IO_STREAM_GET_CLASS (stream);
 500
 501   task = g_task_new (stream, cancellable, callback, user_data);
 502
 503   /* socket close is not blocked, just do it! */
 504   error = NULL;
 505   if (class->close_fn &&
 506       !class->close_fn (stream, cancellable, &error))
 507     g_task_return_error (task, error);
 508   else
 509     g_task_return_boolean (task, TRUE);
 510
 511   g_object_unref (task);
 512 }
 513
 514 static gboolean
 515 g_socket_connection_close_finish (GIOStream     *stream,
 516                                   GAsyncResult  *result,
 517                                   GError       **error)
 518 {
 519   return g_task_propagate_boolean (G_TASK (result), error);
 520 }
 521
 522 typedef struct {
 523   GSocketFamily socket_family;
 524   GSocketType socket_type;
 525   int protocol;
 526   GType implementation;
 527 } ConnectionFactory;
 528
 529 static guint
 530 connection_factory_hash (gconstpointer key)
 531 {
 532   const ConnectionFactory *factory = key;
 533   guint h;
 534
 535   h = factory->socket_family ^ (factory->socket_type << 4) ^ (factory->protocol << 8);
 536   /* This is likely to be small, so spread over whole
 537      hash space to get some distribution */
 538   h = h ^ (h << 8) ^ (h << 16) ^ (h << 24);
 539
 540   return h;
 541 }
 542
 543 static gboolean
 544 connection_factory_equal (gconstpointer _a,
 545                           gconstpointer _b)
 546 {
 547   const ConnectionFactory *a = _a;
 548   const ConnectionFactory *b = _b;
 549
 550   if (a->socket_family != b->socket_family)
 551     return FALSE;
 552
 553   if (a->socket_type != b->socket_type)
 554     return FALSE;
 555
 556   if (a->protocol != b->protocol)
 557     return FALSE;
 558
 559   return TRUE;
 560 }
 561
 562 static GHashTable *connection_factories = NULL;
 563 G_LOCK_DEFINE_STATIC(connection_factories);
 564
 565 /**
 566  * g_socket_connection_factory_register_type:
 567  * @g_type: a #GType, inheriting from %G_TYPE_SOCKET_CONNECTION
 568  * @family: a #GSocketFamily
 569  * @type: a #GSocketType
 570  * @protocol: a protocol id
 571  *
 572  * Looks up the #GType to be used when creating socket connections on
 573  * sockets with the specified @family, @type and @protocol.
 574  *
 575  * If no type is registered, the #GSocketConnection base type is returned.
 576  *
 577  * Since: 2.22
 578  */
 579 void
 580 g_socket_connection_factory_register_type (GType         g_type,
 581                                            GSocketFamily family,
 582                                            GSocketType   type,
 583                                            gint          protocol)
 584 {
 585   ConnectionFactory *factory;
 586
 587   g_return_if_fail (g_type_is_a (g_type, G_TYPE_SOCKET_CONNECTION));
 588
 589   G_LOCK (connection_factories);
 590
 591   if (connection_factories == NULL)
 592     connection_factories = g_hash_table_new_full (connection_factory_hash,
 593                                                   connection_factory_equal,
 594                                                   (GDestroyNotify)g_free,
 595                                                   NULL);
 596
 597   factory = g_new0 (ConnectionFactory, 1);
 598   factory->socket_family = family;
 599   factory->socket_type = type;
 600   factory->protocol = protocol;
 601   factory->implementation = g_type;
 602
 603   g_hash_table_insert (connection_factories,
 604                        factory, factory);
 605
 606   G_UNLOCK (connection_factories);
 607 }
 608
 609 static void
 610 init_builtin_types (void)
 611 {
 612 #ifndef G_OS_WIN32
 613   g_type_ensure (G_TYPE_UNIX_CONNECTION);
 614 #endif
 615   g_type_ensure (G_TYPE_TCP_CONNECTION);
 616 }
 617
 618 /**
 619  * g_socket_connection_factory_lookup_type:
 620  * @family: a #GSocketFamily
 621  * @type: a #GSocketType
 622  * @protocol_id: a protocol id
 623  *
 624  * Looks up the #GType to be used when creating socket connections on
 625  * sockets with the specified @family, @type and @protocol_id.
 626  *
 627  * If no type is registered, the #GSocketConnection base type is returned.
 628  *
 629  * Returns: a #GType
 630  *
 631  * Since: 2.22
 632  */
 633 GType
 634 g_socket_connection_factory_lookup_type (GSocketFamily family,
 635                                          GSocketType   type,
 636                                          gint          protocol_id)
 637 {
 638   ConnectionFactory *factory, key;
 639   GType g_type;
 640
 641   init_builtin_types ();
 642
 643   G_LOCK (connection_factories);
 644
 645   g_type = G_TYPE_SOCKET_CONNECTION;
 646
 647   if (connection_factories)
 648     {
 649       key.socket_family = family;
 650       key.socket_type = type;
 651       key.protocol = protocol_id;
 652
 653       factory = g_hash_table_lookup (connection_factories, &key);
 654       if (factory)
 655         g_type = factory->implementation;
 656     }
 657
 658   G_UNLOCK (connection_factories);
 659
 660   return g_type;
 661 }
 662
 663 /**
 664  * g_socket_connection_factory_create_connection:
 665  * @socket: a #GSocket
 666  *
 667  * Creates a #GSocketConnection subclass of the right type for
 668  * @socket.
 669  *
 670  * Returns: (transfer full): a #GSocketConnection
 671  *
 672  * Since: 2.22
 673  */
 674 GSocketConnection *
 675 g_socket_connection_factory_create_connection (GSocket *socket)
 676 {
 677   GType type;
 678
 679   type = g_socket_connection_factory_lookup_type (g_socket_get_family (socket),
 680                                                   g_socket_get_socket_type (socket),
 681                                                   g_socket_get_protocol (socket));
 682   return g_object_new (type, "socket", socket, NULL);
 683 }