gio/gnetworkservice.c

   1 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
   2
   3 /* GIO - GLib Input, Output and Streaming Library
   4  *
   5  * Copyright (C) 2008 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, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include "config.h"
  22 #include <glib.h>
  23 #include "glibintl.h"
  24
  25 #include "gnetworkservice.h"
  26
  27 #include "gcancellable.h"
  28 #include "ginetaddress.h"
  29 #include "ginetsocketaddress.h"
  30 #include "gioerror.h"
  31 #include "gnetworkaddress.h"
  32 #include "gnetworkingprivate.h"
  33 #include "gresolver.h"
  34 #include "gtask.h"
  35 #include "gsocketaddressenumerator.h"
  36 #include "gsocketconnectable.h"
  37 #include "gsrvtarget.h"
  38
  39 #include <stdlib.h>
  40 #include <string.h>
  41
  42
  43 /**
  44  * SECTION:gnetworkservice
  45  * @short_description: A GSocketConnectable for resolving SRV records
  46  * @include: gio/gio.h
  47  *
  48  * Like #GNetworkAddress does with hostnames, #GNetworkService
  49  * provides an easy way to resolve a SRV record, and then attempt to
  50  * connect to one of the hosts that implements that service, handling
  51  * service priority/weighting, multiple IP addresses, and multiple
  52  * address families.
  53  *
  54  * See #GSrvTarget for more information about SRV records, and see
  55  * #GSocketConnectable for and example of using the connectable
  56  * interface.
  57  */
  58
  59 /**
  60  * GNetworkService:
  61  *
  62  * A #GSocketConnectable for resolving a SRV record and connecting to
  63  * that service.
  64  */
  65
  66 struct _GNetworkServicePrivate
  67 {
  68   gchar *service, *protocol, *domain, *scheme;
  69   GList *targets;
  70 };
  71
  72 enum {
  73   PROP_0,
  74   PROP_SERVICE,
  75   PROP_PROTOCOL,
  76   PROP_DOMAIN,
  77   PROP_SCHEME
  78 };
  79
  80 static void g_network_service_set_property (GObject      *object,
  81                                             guint         prop_id,
  82                                             const GValue *value,
  83                                             GParamSpec   *pspec);
  84 static void g_network_service_get_property (GObject      *object,
  85                                             guint         prop_id,
  86                                             GValue       *value,
  87                                             GParamSpec   *pspec);
  88
  89 static void                      g_network_service_connectable_iface_init       (GSocketConnectableIface *iface);
  90 static GSocketAddressEnumerator *g_network_service_connectable_enumerate        (GSocketConnectable      *connectable);
  91 static GSocketAddressEnumerator *g_network_service_connectable_proxy_enumerate  (GSocketConnectable      *connectable);
  92
  93 G_DEFINE_TYPE_WITH_CODE (GNetworkService, g_network_service, G_TYPE_OBJECT,
  94                          G_ADD_PRIVATE (GNetworkService)
  95                          G_IMPLEMENT_INTERFACE (G_TYPE_SOCKET_CONNECTABLE,
  96                                                 g_network_service_connectable_iface_init))
  97
  98 static void
  99 g_network_service_finalize (GObject *object)
 100 {
 101   GNetworkService *srv = G_NETWORK_SERVICE (object);
 102
 103   g_free (srv->priv->service);
 104   g_free (srv->priv->protocol);
 105   g_free (srv->priv->domain);
 106   g_free (srv->priv->scheme);
 107
 108   if (srv->priv->targets)
 109     g_resolver_free_targets (srv->priv->targets);
 110
 111   G_OBJECT_CLASS (g_network_service_parent_class)->finalize (object);
 112 }
 113
 114 static void
 115 g_network_service_class_init (GNetworkServiceClass *klass)
 116 {
 117   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 118
 119   gobject_class->set_property = g_network_service_set_property;
 120   gobject_class->get_property = g_network_service_get_property;
 121   gobject_class->finalize = g_network_service_finalize;
 122
 123   g_object_class_install_property (gobject_class, PROP_SERVICE,
 124                                    g_param_spec_string ("service",
 125                                                         P_("Service"),
 126                                                         P_("Service name, eg \"ldap\""),
 127                                                         NULL,
 128                                                         G_PARAM_READWRITE |
 129                                                         G_PARAM_CONSTRUCT_ONLY |
 130                                                         G_PARAM_STATIC_STRINGS));
 131   g_object_class_install_property (gobject_class, PROP_PROTOCOL,
 132                                    g_param_spec_string ("protocol",
 133                                                         P_("Protocol"),
 134                                                         P_("Network protocol, eg \"tcp\""),
 135                                                         NULL,
 136                                                         G_PARAM_READWRITE |
 137                                                         G_PARAM_CONSTRUCT_ONLY |
 138                                                         G_PARAM_STATIC_STRINGS));
 139   g_object_class_install_property (gobject_class, PROP_DOMAIN,
 140                                    g_param_spec_string ("domain",
 141                                                         P_("Domain"),
 142                                                         P_("Network domain, eg, \"example.com\""),
 143                                                         NULL,
 144                                                         G_PARAM_READWRITE |
 145                                                         G_PARAM_CONSTRUCT_ONLY |
 146                                                         G_PARAM_STATIC_STRINGS));
 147   g_object_class_install_property (gobject_class, PROP_DOMAIN,
 148                                    g_param_spec_string ("scheme",
 149                                                         P_("Scheme"),
 150                                                         P_("Network scheme (default is to use service)"),
 151                                                         NULL,
 152                                                         G_PARAM_READWRITE |
 153                                                         G_PARAM_STATIC_STRINGS));
 154
 155 }
 156
 157 static void
 158 g_network_service_connectable_iface_init (GSocketConnectableIface *connectable_iface)
 159 {
 160   connectable_iface->enumerate = g_network_service_connectable_enumerate;
 161   connectable_iface->proxy_enumerate = g_network_service_connectable_proxy_enumerate;
 162 }
 163
 164 static void
 165 g_network_service_init (GNetworkService *srv)
 166 {
 167   srv->priv = g_network_service_get_instance_private (srv);
 168 }
 169
 170 static void
 171 g_network_service_set_property (GObject      *object,
 172                                 guint         prop_id,
 173                                 const GValue *value,
 174                                 GParamSpec   *pspec)
 175 {
 176   GNetworkService *srv = G_NETWORK_SERVICE (object);
 177
 178   switch (prop_id)
 179     {
 180     case PROP_SERVICE:
 181       srv->priv->service = g_value_dup_string (value);
 182       break;
 183
 184     case PROP_PROTOCOL:
 185       srv->priv->protocol = g_value_dup_string (value);
 186       break;
 187
 188     case PROP_DOMAIN:
 189       srv->priv->domain = g_value_dup_string (value);
 190       break;
 191
 192     case PROP_SCHEME:
 193       g_network_service_set_scheme (srv, g_value_get_string (value));
 194       break;
 195
 196     default:
 197       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 198       break;
 199     }
 200 }
 201
 202 static void
 203 g_network_service_get_property (GObject    *object,
 204                                 guint       prop_id,
 205                                 GValue     *value,
 206                                 GParamSpec *pspec)
 207 {
 208   GNetworkService *srv = G_NETWORK_SERVICE (object);
 209
 210   switch (prop_id)
 211     {
 212     case PROP_SERVICE:
 213       g_value_set_string (value, g_network_service_get_service (srv));
 214       break;
 215
 216     case PROP_PROTOCOL:
 217       g_value_set_string (value, g_network_service_get_protocol (srv));
 218       break;
 219
 220     case PROP_DOMAIN:
 221       g_value_set_string (value, g_network_service_get_domain (srv));
 222       break;
 223
 224     case PROP_SCHEME:
 225       g_value_set_string (value, g_network_service_get_scheme (srv));
 226       break;
 227
 228     default:
 229       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 230       break;
 231     }
 232 }
 233
 234 /**
 235  * g_network_service_new:
 236  * @service: the service type to look up (eg, "ldap")
 237  * @protocol: the networking protocol to use for @service (eg, "tcp")
 238  * @domain: the DNS domain to look up the service in
 239  *
 240  * Creates a new #GNetworkService representing the given @service,
 241  * @protocol, and @domain. This will initially be unresolved; use the
 242  * #GSocketConnectable interface to resolve it.
 243  *
 244  * Returns: (transfer full) (type GNetworkService): a new #GNetworkService
 245  *
 246  * Since: 2.22
 247  */
 248 GSocketConnectable *
 249 g_network_service_new (const gchar *service,
 250                        const gchar *protocol,
 251                        const gchar *domain)
 252 {
 253   return g_object_new (G_TYPE_NETWORK_SERVICE,
 254                        "service", service,
 255                        "protocol", protocol,
 256                        "domain", domain,
 257                        NULL);
 258 }
 259
 260 /**
 261  * g_network_service_get_service:
 262  * @srv: a #GNetworkService
 263  *
 264  * Gets @srv's service name (eg, "ldap").
 265  *
 266  * Returns: @srv's service name
 267  *
 268  * Since: 2.22
 269  */
 270 const gchar *
 271 g_network_service_get_service (GNetworkService *srv)
 272 {
 273   g_return_val_if_fail (G_IS_NETWORK_SERVICE (srv), NULL);
 274
 275   return srv->priv->service;
 276 }
 277
 278 /**
 279  * g_network_service_get_protocol:
 280  * @srv: a #GNetworkService
 281  *
 282  * Gets @srv's protocol name (eg, "tcp").
 283  *
 284  * Returns: @srv's protocol name
 285  *
 286  * Since: 2.22
 287  */
 288 const gchar *
 289 g_network_service_get_protocol (GNetworkService *srv)
 290 {
 291   g_return_val_if_fail (G_IS_NETWORK_SERVICE (srv), NULL);
 292
 293   return srv->priv->protocol;
 294 }
 295
 296 /**
 297  * g_network_service_get_domain:
 298  * @srv: a #GNetworkService
 299  *
 300  * Gets the domain that @srv serves. This might be either UTF-8 or
 301  * ASCII-encoded, depending on what @srv was created with.
 302  *
 303  * Returns: @srv's domain name
 304  *
 305  * Since: 2.22
 306  */
 307 const gchar *
 308 g_network_service_get_domain (GNetworkService *srv)
 309 {
 310   g_return_val_if_fail (G_IS_NETWORK_SERVICE (srv), NULL);
 311
 312   return srv->priv->domain;
 313 }
 314
 315 /**
 316  * g_network_service_get_scheme:
 317  * @srv: a #GNetworkService
 318  *
 319  * Get's the URI scheme used to resolve proxies. By default, the service name
 320  * is used as scheme.
 321  *
 322  * Returns: @srv's scheme name
 323  *
 324  * Since: 2.26
 325  */
 326 const gchar *
 327 g_network_service_get_scheme (GNetworkService *srv)
 328 {
 329   g_return_val_if_fail (G_IS_NETWORK_SERVICE (srv), NULL);
 330
 331   if (srv->priv->scheme)
 332     return srv->priv->scheme;
 333   else
 334     return srv->priv->service;
 335 }
 336
 337 /**
 338  * g_network_service_set_scheme:
 339  * @srv: a #GNetworkService
 340  * @scheme: a URI scheme
 341  *
 342  * Set's the URI scheme used to resolve proxies. By default, the service name
 343  * is used as scheme.
 344  *
 345  * Since: 2.26
 346  */
 347 void
 348 g_network_service_set_scheme (GNetworkService *srv,
 349                               const gchar     *scheme)
 350 {
 351   g_return_if_fail (G_IS_NETWORK_SERVICE (srv));
 352
 353   if (srv->priv->scheme)
 354     g_free (srv->priv->scheme);
 355   srv->priv->scheme = g_strdup (scheme);
 356
 357   g_object_notify (G_OBJECT (srv), "scheme");
 358 }
 359
 360 static GList *
 361 g_network_service_fallback_targets (GNetworkService *srv)
 362 {
 363   GSrvTarget *target;
 364   struct servent *entry;
 365   guint16 port;
 366
 367   entry = getservbyname (srv->priv->service, "tcp");
 368   port = entry ? g_ntohs (entry->s_port) : 0;
 369 #ifdef HAVE_ENDSERVENT
 370   endservent ();
 371 #endif
 372
 373   if (entry == NULL)
 374       return NULL;
 375
 376   target = g_srv_target_new (srv->priv->domain, port, 0, 0);
 377   return g_list_append (NULL, target);
 378 }
 379
 380 #define G_TYPE_NETWORK_SERVICE_ADDRESS_ENUMERATOR (_g_network_service_address_enumerator_get_type ())
 381 #define G_NETWORK_SERVICE_ADDRESS_ENUMERATOR(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), G_TYPE_NETWORK_SERVICE_ADDRESS_ENUMERATOR, GNetworkServiceAddressEnumerator))
 382
 383 typedef struct {
 384   GSocketAddressEnumerator parent_instance;
 385
 386   GResolver *resolver;
 387   GNetworkService *srv;
 388   GSocketAddressEnumerator *addr_enum;
 389   GList *t;
 390   gboolean use_proxy;
 391
 392   GError *error;
 393
 394 } GNetworkServiceAddressEnumerator;
 395
 396 typedef struct {
 397   GSocketAddressEnumeratorClass parent_class;
 398
 399 } GNetworkServiceAddressEnumeratorClass;
 400
 401 static GType _g_network_service_address_enumerator_get_type (void);
 402 G_DEFINE_TYPE (GNetworkServiceAddressEnumerator, _g_network_service_address_enumerator, G_TYPE_SOCKET_ADDRESS_ENUMERATOR)
 403
 404 static GSocketAddress *
 405 g_network_service_address_enumerator_next (GSocketAddressEnumerator  *enumerator,
 406                                            GCancellable              *cancellable,
 407                                            GError                   **error)
 408 {
 409   GNetworkServiceAddressEnumerator *srv_enum =
 410     G_NETWORK_SERVICE_ADDRESS_ENUMERATOR (enumerator);
 411   GSocketAddress *ret = NULL;
 412
 413   /* If we haven't yet resolved srv, do that */
 414   if (!srv_enum->srv->priv->targets)
 415     {
 416       GList *targets;
 417       GError *my_error = NULL;
 418
 419       targets = g_resolver_lookup_service (srv_enum->resolver,
 420                                            srv_enum->srv->priv->service,
 421                                            srv_enum->srv->priv->protocol,
 422                                            srv_enum->srv->priv->domain,
 423                                            cancellable, &my_error);
 424       if (!targets && g_error_matches (my_error, G_RESOLVER_ERROR,
 425                                        G_RESOLVER_ERROR_NOT_FOUND))
 426         {
 427           targets = g_network_service_fallback_targets (srv_enum->srv);
 428           if (targets)
 429             g_clear_error (&my_error);
 430         }
 431
 432       if (my_error)
 433         {
 434           g_propagate_error (error, my_error);
 435           return NULL;
 436         }
 437
 438       srv_enum->srv->priv->targets = targets;
 439       srv_enum->t = srv_enum->srv->priv->targets;
 440     }
 441
 442   /* Delegate to GNetworkAddress */
 443   do
 444     {
 445       if (srv_enum->addr_enum == NULL && srv_enum->t)
 446         {
 447           GError *error = NULL;
 448           gchar *uri;
 449           gchar *hostname;
 450           GSocketConnectable *addr;
 451           GSrvTarget *target = srv_enum->t->data;
 452
 453           srv_enum->t = g_list_next (srv_enum->t);
 454
 455           hostname = g_hostname_to_ascii (g_srv_target_get_hostname (target));
 456
 457           if (hostname == NULL)
 458             {
 459               if (srv_enum->error == NULL)
 460                 srv_enum->error =
 461                   g_error_new (G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
 462                                "Received invalid hostname '%s' from GSrvTarget",
 463                                g_srv_target_get_hostname (target));
 464               continue;
 465             }
 466
 467           uri = _g_uri_from_authority (g_network_service_get_scheme (srv_enum->srv),
 468                                        hostname,
 469                                        g_srv_target_get_port (target),
 470                                        NULL);
 471           g_free (hostname);
 472
 473           addr = g_network_address_parse_uri (uri,
 474                                               g_srv_target_get_port (target),
 475                                               &error);
 476           g_free (uri);
 477
 478           if (addr == NULL)
 479             {
 480               if (srv_enum->error == NULL)
 481                 srv_enum->error = error;
 482               continue;
 483             }
 484
 485           if (srv_enum->use_proxy)
 486             srv_enum->addr_enum = g_socket_connectable_proxy_enumerate (addr);
 487           else
 488             srv_enum->addr_enum = g_socket_connectable_enumerate (addr);
 489           g_object_unref (addr);
 490         }
 491
 492       if (srv_enum->addr_enum)
 493         {
 494           GError *error = NULL;
 495
 496           ret = g_socket_address_enumerator_next (srv_enum->addr_enum,
 497                                                   cancellable,
 498                                                   &error);
 499
 500           if (error)
 501             {
 502               if (srv_enum->error == NULL)
 503                 srv_enum->error = error;
 504               else
 505                 g_error_free (error);
 506             }
 507
 508           if (!ret)
 509             {
 510               g_object_unref (srv_enum->addr_enum);
 511               srv_enum->addr_enum = NULL;
 512             }
 513         }
 514     }
 515   while (srv_enum->addr_enum == NULL && srv_enum->t);
 516
 517   if (ret == NULL && srv_enum->error)
 518     {
 519       g_propagate_error (error, srv_enum->error);
 520       srv_enum->error = NULL;
 521     }
 522
 523   return ret;
 524 }
 525
 526 static void next_async_resolved_targets   (GObject      *source_object,
 527                                            GAsyncResult *result,
 528                                            gpointer      user_data);
 529 static void next_async_have_targets       (GTask        *srv_enum);
 530 static void next_async_have_address       (GObject      *source_object,
 531                                            GAsyncResult *result,
 532                                            gpointer      user_data);
 533
 534 static void
 535 g_network_service_address_enumerator_next_async (GSocketAddressEnumerator  *enumerator,
 536                                                  GCancellable              *cancellable,
 537                                                  GAsyncReadyCallback        callback,
 538                                                  gpointer                   user_data)
 539 {
 540   GNetworkServiceAddressEnumerator *srv_enum =
 541     G_NETWORK_SERVICE_ADDRESS_ENUMERATOR (enumerator);
 542   GTask *task;
 543
 544   task = g_task_new (enumerator, cancellable, callback, user_data);
 545
 546   /* If we haven't yet resolved srv, do that */
 547   if (!srv_enum->srv->priv->targets)
 548     {
 549       g_resolver_lookup_service_async (srv_enum->resolver,
 550                                        srv_enum->srv->priv->service,
 551                                        srv_enum->srv->priv->protocol,
 552                                        srv_enum->srv->priv->domain,
 553                                        cancellable,
 554                                        next_async_resolved_targets,
 555                                        task);
 556     }
 557   else
 558     next_async_have_targets (task);
 559 }
 560
 561 static void
 562 next_async_resolved_targets (GObject      *source_object,
 563                              GAsyncResult *result,
 564                              gpointer      user_data)
 565 {
 566   GTask *task = user_data;
 567   GNetworkServiceAddressEnumerator *srv_enum = g_task_get_source_object (task);
 568   GError *error = NULL;
 569   GList *targets;
 570
 571   targets = g_resolver_lookup_service_finish (srv_enum->resolver,
 572                                               result, &error);
 573
 574   if (!targets && g_error_matches (error, G_RESOLVER_ERROR,
 575                                    G_RESOLVER_ERROR_NOT_FOUND))
 576     {
 577       targets = g_network_service_fallback_targets (srv_enum->srv);
 578       if (targets)
 579         g_clear_error (&error);
 580     }
 581
 582   if (error)
 583     {
 584       g_task_return_error (task, error);
 585       g_object_unref (task);
 586     }
 587   else
 588     {
 589       srv_enum->t = srv_enum->srv->priv->targets = targets;
 590       next_async_have_targets (task);
 591     }
 592 }
 593
 594 static void
 595 next_async_have_targets (GTask *task)
 596 {
 597   GNetworkServiceAddressEnumerator *srv_enum = g_task_get_source_object (task);
 598
 599   /* Delegate to GNetworkAddress */
 600   if (srv_enum->addr_enum == NULL && srv_enum->t)
 601     {
 602       GSocketConnectable *addr;
 603       GSrvTarget *target = srv_enum->t->data;
 604
 605       srv_enum->t = g_list_next (srv_enum->t);
 606       addr = g_network_address_new (g_srv_target_get_hostname (target),
 607                                     (guint16) g_srv_target_get_port (target));
 608
 609       if (srv_enum->use_proxy)
 610         srv_enum->addr_enum = g_socket_connectable_proxy_enumerate (addr);
 611       else
 612         srv_enum->addr_enum = g_socket_connectable_enumerate (addr);
 613
 614       g_object_unref (addr);
 615     }
 616
 617   if (srv_enum->addr_enum)
 618     {
 619       g_socket_address_enumerator_next_async (srv_enum->addr_enum,
 620                                               g_task_get_cancellable (task),
 621                                               next_async_have_address,
 622                                               task);
 623     }
 624   else
 625     {
 626       if (srv_enum->error)
 627         {
 628           g_task_return_error (task, srv_enum->error);
 629           srv_enum->error = NULL;
 630         }
 631       else
 632         g_task_return_pointer (task, NULL, NULL);
 633
 634       g_object_unref (task);
 635     }
 636 }
 637
 638 static void
 639 next_async_have_address (GObject      *source_object,
 640                          GAsyncResult *result,
 641                          gpointer      user_data)
 642 {
 643   GTask *task = user_data;
 644   GNetworkServiceAddressEnumerator *srv_enum = g_task_get_source_object (task);
 645   GSocketAddress *address;
 646   GError *error = NULL;
 647
 648   address = g_socket_address_enumerator_next_finish (srv_enum->addr_enum,
 649                                                      result,
 650                                                      &error);
 651
 652   if (error)
 653     {
 654       if (srv_enum->error == NULL)
 655         srv_enum->error = error;
 656       else
 657         g_error_free (error);
 658     }
 659
 660   if (!address)
 661     {
 662       g_object_unref (srv_enum->addr_enum);
 663       srv_enum->addr_enum = NULL;
 664
 665       next_async_have_targets (task);
 666     }
 667   else
 668     {
 669       g_task_return_pointer (task, address, g_object_unref);
 670       g_object_unref (task);
 671     }
 672 }
 673
 674 static GSocketAddress *
 675 g_network_service_address_enumerator_next_finish (GSocketAddressEnumerator  *enumerator,
 676                                                   GAsyncResult              *result,
 677                                                   GError                   **error)
 678 {
 679   return g_task_propagate_pointer (G_TASK (result), error);
 680 }
 681
 682 static void
 683 _g_network_service_address_enumerator_init (GNetworkServiceAddressEnumerator *enumerator)
 684 {
 685 }
 686
 687 static void
 688 g_network_service_address_enumerator_finalize (GObject *object)
 689 {
 690   GNetworkServiceAddressEnumerator *srv_enum =
 691     G_NETWORK_SERVICE_ADDRESS_ENUMERATOR (object);
 692
 693   if (srv_enum->srv)
 694     g_object_unref (srv_enum->srv);
 695
 696   if (srv_enum->addr_enum)
 697     g_object_unref (srv_enum->addr_enum);
 698
 699   if (srv_enum->resolver)
 700     g_object_unref (srv_enum->resolver);
 701
 702   if (srv_enum->error)
 703     g_error_free (srv_enum->error);
 704
 705   G_OBJECT_CLASS (_g_network_service_address_enumerator_parent_class)->finalize (object);
 706 }
 707
 708 static void
 709 _g_network_service_address_enumerator_class_init (GNetworkServiceAddressEnumeratorClass *srvenum_class)
 710 {
 711   GObjectClass *object_class = G_OBJECT_CLASS (srvenum_class);
 712   GSocketAddressEnumeratorClass *enumerator_class =
 713     G_SOCKET_ADDRESS_ENUMERATOR_CLASS (srvenum_class);
 714
 715   enumerator_class->next        = g_network_service_address_enumerator_next;
 716   enumerator_class->next_async  = g_network_service_address_enumerator_next_async;
 717   enumerator_class->next_finish = g_network_service_address_enumerator_next_finish;
 718
 719   object_class->finalize = g_network_service_address_enumerator_finalize;
 720 }
 721
 722 static GSocketAddressEnumerator *
 723 g_network_service_connectable_enumerate (GSocketConnectable *connectable)
 724 {
 725   GNetworkServiceAddressEnumerator *srv_enum;
 726
 727   srv_enum = g_object_new (G_TYPE_NETWORK_SERVICE_ADDRESS_ENUMERATOR, NULL);
 728   srv_enum->srv = g_object_ref (connectable);
 729   srv_enum->resolver = g_resolver_get_default ();
 730   srv_enum->use_proxy = FALSE;
 731
 732   return G_SOCKET_ADDRESS_ENUMERATOR (srv_enum);
 733 }
 734
 735 static GSocketAddressEnumerator *
 736 g_network_service_connectable_proxy_enumerate (GSocketConnectable *connectable)
 737 {
 738   GSocketAddressEnumerator *addr_enum;
 739   GNetworkServiceAddressEnumerator *srv_enum;
 740
 741   addr_enum = g_network_service_connectable_enumerate (connectable);
 742   srv_enum = G_NETWORK_SERVICE_ADDRESS_ENUMERATOR (addr_enum);
 743   srv_enum->use_proxy = TRUE;
 744
 745   return addr_enum;
 746 }