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, write to the
  19  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  20  * Boston, MA 02111-1307, USA.
  21  */
  22
  23 #include "config.h"
  24 #include <glib.h>
  25 #include "glibintl.h"
  26
  27 #include "gnetworkservice.h"
  28
  29 #include "gcancellable.h"
  30 #include "ginetaddress.h"
  31 #include "ginetsocketaddress.h"
  32 #include "gioerror.h"
  33 #include "gnetworkaddress.h"
  34 #include "gnetworkingprivate.h"
  35 #include "gresolver.h"
  36 #include "gtask.h"
  37 #include "gsocketaddressenumerator.h"
  38 #include "gsocketconnectable.h"
  39 #include "gsrvtarget.h"
  40
  41 #include <stdlib.h>
  42 #include <string.h>
  43
  44
  45 /**
  46  * SECTION:gnetworkservice
  47  * @short_description: A GSocketConnectable for resolving SRV records
  48  * @include: gio/gio.h
  49  *
  50  * Like #GNetworkAddress does with hostnames, #GNetworkService
  51  * provides an easy way to resolve a SRV record, and then attempt to
  52  * connect to one of the hosts that implements that service, handling
  53  * service priority/weighting, multiple IP addresses, and multiple
  54  * address families.
  55  *
  56  * See #GSrvTarget for more information about SRV records, and see
  57  * #GSocketConnectable for and example of using the connectable
  58  * interface.
  59  */
  60
  61 /**
  62  * GNetworkService:
  63  *
  64  * A #GSocketConnectable for resolving a SRV record and connecting to
  65  * that service.
  66  */
  67
  68 struct _GNetworkServicePrivate
  69 {
  70   gchar *service, *protocol, *domain, *scheme;
  71   GList *targets;
  72 };
  73
  74 enum {
  75   PROP_0,
  76   PROP_SERVICE,
  77   PROP_PROTOCOL,
  78   PROP_DOMAIN,
  79   PROP_SCHEME
  80 };
  81
  82 static void g_network_service_set_property (GObject      *object,
  83                                             guint         prop_id,
  84                                             const GValue *value,
  85                                             GParamSpec   *pspec);
  86 static void g_network_service_get_property (GObject      *object,
  87                                             guint         prop_id,
  88                                             GValue       *value,
  89                                             GParamSpec   *pspec);
  90
  91 static void                      g_network_service_connectable_iface_init       (GSocketConnectableIface *iface);
  92 static GSocketAddressEnumerator *g_network_service_connectable_enumerate        (GSocketConnectable      *connectable);
  93 static GSocketAddressEnumerator *g_network_service_connectable_proxy_enumerate  (GSocketConnectable      *connectable);
  94
  95 G_DEFINE_TYPE_WITH_CODE (GNetworkService, g_network_service, G_TYPE_OBJECT,
  96                          G_ADD_PRIVATE (GNetworkService)
  97                          G_IMPLEMENT_INTERFACE (G_TYPE_SOCKET_CONNECTABLE,
  98                                                 g_network_service_connectable_iface_init))
  99
 100 static void
 101 g_network_service_finalize (GObject *object)
 102 {
 103   GNetworkService *srv = G_NETWORK_SERVICE (object);
 104
 105   g_free (srv->priv->service);
 106   g_free (srv->priv->protocol);
 107   g_free (srv->priv->domain);
 108   g_free (srv->priv->scheme);
 109
 110   if (srv->priv->targets)
 111     g_resolver_free_targets (srv->priv->targets);
 112
 113   G_OBJECT_CLASS (g_network_service_parent_class)->finalize (object);
 114 }
 115
 116 static void
 117 g_network_service_class_init (GNetworkServiceClass *klass)
 118 {
 119   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 120
 121   gobject_class->set_property = g_network_service_set_property;
 122   gobject_class->get_property = g_network_service_get_property;
 123   gobject_class->finalize = g_network_service_finalize;
 124
 125   g_object_class_install_property (gobject_class, PROP_SERVICE,
 126                                    g_param_spec_string ("service",
 127                                                         P_("Service"),
 128                                                         P_("Service name, eg \"ldap\""),
 129                                                         NULL,
 130                                                         G_PARAM_READWRITE |
 131                                                         G_PARAM_CONSTRUCT_ONLY |
 132                                                         G_PARAM_STATIC_STRINGS));
 133   g_object_class_install_property (gobject_class, PROP_PROTOCOL,
 134                                    g_param_spec_string ("protocol",
 135                                                         P_("Protocol"),
 136                                                         P_("Network protocol, eg \"tcp\""),
 137                                                         NULL,
 138                                                         G_PARAM_READWRITE |
 139                                                         G_PARAM_CONSTRUCT_ONLY |
 140                                                         G_PARAM_STATIC_STRINGS));
 141   g_object_class_install_property (gobject_class, PROP_DOMAIN,
 142                                    g_param_spec_string ("domain",
 143                                                         P_("Domain"),
 144                                                         P_("Network domain, eg, \"example.com\""),
 145                                                         NULL,
 146                                                         G_PARAM_READWRITE |
 147                                                         G_PARAM_CONSTRUCT_ONLY |
 148                                                         G_PARAM_STATIC_STRINGS));
 149   g_object_class_install_property (gobject_class, PROP_DOMAIN,
 150                                    g_param_spec_string ("scheme",
 151                                                         P_("Scheme"),
 152                                                         P_("Network scheme (default is to use service)"),
 153                                                         NULL,
 154                                                         G_PARAM_READWRITE |
 155                                                         G_PARAM_STATIC_STRINGS));
 156
 157 }
 158
 159 static void
 160 g_network_service_connectable_iface_init (GSocketConnectableIface *connectable_iface)
 161 {
 162   connectable_iface->enumerate = g_network_service_connectable_enumerate;
 163   connectable_iface->proxy_enumerate = g_network_service_connectable_proxy_enumerate;
 164 }
 165
 166 static void
 167 g_network_service_init (GNetworkService *srv)
 168 {
 169   srv->priv = g_network_service_get_instance_private (srv);
 170 }
 171
 172 static void
 173 g_network_service_set_property (GObject      *object,
 174                                 guint         prop_id,
 175                                 const GValue *value,
 176                                 GParamSpec   *pspec)
 177 {
 178   GNetworkService *srv = G_NETWORK_SERVICE (object);
 179
 180   switch (prop_id)
 181     {
 182     case PROP_SERVICE:
 183       srv->priv->service = g_value_dup_string (value);
 184       break;
 185
 186     case PROP_PROTOCOL:
 187       srv->priv->protocol = g_value_dup_string (value);
 188       break;
 189
 190     case PROP_DOMAIN:
 191       srv->priv->domain = g_value_dup_string (value);
 192       break;
 193
 194     case PROP_SCHEME:
 195       g_network_service_set_scheme (srv, g_value_get_string (value));
 196       break;
 197
 198     default:
 199       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 200       break;
 201     }
 202 }
 203
 204 static void
 205 g_network_service_get_property (GObject    *object,
 206                                 guint       prop_id,
 207                                 GValue     *value,
 208                                 GParamSpec *pspec)
 209 {
 210   GNetworkService *srv = G_NETWORK_SERVICE (object);
 211
 212   switch (prop_id)
 213     {
 214     case PROP_SERVICE:
 215       g_value_set_string (value, g_network_service_get_service (srv));
 216       break;
 217
 218     case PROP_PROTOCOL:
 219       g_value_set_string (value, g_network_service_get_protocol (srv));
 220       break;
 221
 222     case PROP_DOMAIN:
 223       g_value_set_string (value, g_network_service_get_domain (srv));
 224       break;
 225
 226     case PROP_SCHEME:
 227       g_value_set_string (value, g_network_service_get_scheme (srv));
 228       break;
 229
 230     default:
 231       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 232       break;
 233     }
 234 }
 235
 236 /**
 237  * g_network_service_new:
 238  * @service: the service type to look up (eg, "ldap")
 239  * @protocol: the networking protocol to use for @service (eg, "tcp")
 240  * @domain: the DNS domain to look up the service in
 241  *
 242  * Creates a new #GNetworkService representing the given @service,
 243  * @protocol, and @domain. This will initially be unresolved; use the
 244  * #GSocketConnectable interface to resolve it.
 245  *
 246  * Return value: (transfer full) (type GNetworkService): a new #GNetworkService
 247  *
 248  * Since: 2.22
 249  */
 250 GSocketConnectable *
 251 g_network_service_new (const gchar *service,
 252                        const gchar *protocol,
 253                        const gchar *domain)
 254 {
 255   return g_object_new (G_TYPE_NETWORK_SERVICE,
 256                        "service", service,
 257                        "protocol", protocol,
 258                        "domain", domain,
 259                        NULL);
 260 }
 261
 262 /**
 263  * g_network_service_get_service:
 264  * @srv: a #GNetworkService
 265  *
 266  * Gets @srv's service name (eg, "ldap").
 267  *
 268  * Return value: @srv's service name
 269  *
 270  * Since: 2.22
 271  */
 272 const gchar *
 273 g_network_service_get_service (GNetworkService *srv)
 274 {
 275   g_return_val_if_fail (G_IS_NETWORK_SERVICE (srv), NULL);
 276
 277   return srv->priv->service;
 278 }
 279
 280 /**
 281  * g_network_service_get_protocol:
 282  * @srv: a #GNetworkService
 283  *
 284  * Gets @srv's protocol name (eg, "tcp").
 285  *
 286  * Return value: @srv's protocol name
 287  *
 288  * Since: 2.22
 289  */
 290 const gchar *
 291 g_network_service_get_protocol (GNetworkService *srv)
 292 {
 293   g_return_val_if_fail (G_IS_NETWORK_SERVICE (srv), NULL);
 294
 295   return srv->priv->protocol;
 296 }
 297
 298 /**
 299  * g_network_service_get_domain:
 300  * @srv: a #GNetworkService
 301  *
 302  * Gets the domain that @srv serves. This might be either UTF-8 or
 303  * ASCII-encoded, depending on what @srv was created with.
 304  *
 305  * Return value: @srv's domain name
 306  *
 307  * Since: 2.22
 308  */
 309 const gchar *
 310 g_network_service_get_domain (GNetworkService *srv)
 311 {
 312   g_return_val_if_fail (G_IS_NETWORK_SERVICE (srv), NULL);
 313
 314   return srv->priv->domain;
 315 }
 316
 317 /**
 318  * g_network_service_get_scheme:
 319  * @srv: a #GNetworkService
 320  *
 321  * Get's the URI scheme used to resolve proxies. By default, the service name
 322  * is used as scheme.
 323  *
 324  * Return value: @srv's scheme name
 325  *
 326  * Since: 2.26
 327  */
 328 const gchar *
 329 g_network_service_get_scheme (GNetworkService *srv)
 330 {
 331   g_return_val_if_fail (G_IS_NETWORK_SERVICE (srv), NULL);
 332
 333   if (srv->priv->scheme)
 334     return srv->priv->scheme;
 335   else
 336     return srv->priv->service;
 337 }
 338
 339 /**
 340  * g_network_service_set_scheme:
 341  * @srv: a #GNetworkService
 342  * @scheme: a URI scheme
 343  *
 344  * Set's the URI scheme used to resolve proxies. By default, the service name
 345  * is used as scheme.
 346  *
 347  * Since: 2.26
 348  */
 349 void
 350 g_network_service_set_scheme (GNetworkService *srv,
 351                               const gchar     *scheme)
 352 {
 353   g_return_if_fail (G_IS_NETWORK_SERVICE (srv));
 354
 355   if (srv->priv->scheme)
 356     g_free (srv->priv->scheme);
 357   srv->priv->scheme = g_strdup (scheme);
 358
 359   g_object_notify (G_OBJECT (srv), "scheme");
 360 }
 361
 362 static GList *
 363 g_network_service_fallback_targets (GNetworkService *srv)
 364 {
 365   GSrvTarget *target;
 366   struct servent *entry;
 367   guint16 port;
 368
 369   entry = getservbyname (srv->priv->service, "tcp");
 370   port = entry ? g_ntohs (entry->s_port) : 0;
 371 #ifdef HAVE_ENDSERVENT
 372   endservent ();
 373 #endif
 374
 375   if (entry == NULL)
 376       return NULL;
 377
 378   target = g_srv_target_new (srv->priv->domain, port, 0, 0);
 379   return g_list_append (NULL, target);
 380 }
 381
 382 #define G_TYPE_NETWORK_SERVICE_ADDRESS_ENUMERATOR (_g_network_service_address_enumerator_get_type ())
 383 #define G_NETWORK_SERVICE_ADDRESS_ENUMERATOR(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), G_TYPE_NETWORK_SERVICE_ADDRESS_ENUMERATOR, GNetworkServiceAddressEnumerator))
 384
 385 typedef struct {
 386   GSocketAddressEnumerator parent_instance;
 387
 388   GResolver *resolver;
 389   GNetworkService *srv;
 390   GSocketAddressEnumerator *addr_enum;
 391   GList *t;
 392   gboolean use_proxy;
 393
 394   GError *error;
 395
 396 } GNetworkServiceAddressEnumerator;
 397
 398 typedef struct {
 399   GSocketAddressEnumeratorClass parent_class;
 400
 401 } GNetworkServiceAddressEnumeratorClass;
 402
 403 static GType _g_network_service_address_enumerator_get_type (void);
 404 G_DEFINE_TYPE (GNetworkServiceAddressEnumerator, _g_network_service_address_enumerator, G_TYPE_SOCKET_ADDRESS_ENUMERATOR)
 405
 406 static GSocketAddress *
 407 g_network_service_address_enumerator_next (GSocketAddressEnumerator  *enumerator,
 408                                            GCancellable              *cancellable,
 409                                            GError                   **error)
 410 {
 411   GNetworkServiceAddressEnumerator *srv_enum =
 412     G_NETWORK_SERVICE_ADDRESS_ENUMERATOR (enumerator);
 413   GSocketAddress *ret = NULL;
 414
 415   /* If we haven't yet resolved srv, do that */
 416   if (!srv_enum->srv->priv->targets)
 417     {
 418       GList *targets;
 419       GError *my_error = NULL;
 420
 421       targets = g_resolver_lookup_service (srv_enum->resolver,
 422                                            srv_enum->srv->priv->service,
 423                                            srv_enum->srv->priv->protocol,
 424                                            srv_enum->srv->priv->domain,
 425                                            cancellable, &my_error);
 426       if (!targets && g_error_matches (my_error, G_RESOLVER_ERROR,
 427                                        G_RESOLVER_ERROR_NOT_FOUND))
 428         {
 429           targets = g_network_service_fallback_targets (srv_enum->srv);
 430           if (targets)
 431             g_clear_error (&my_error);
 432         }
 433
 434       if (my_error)
 435         {
 436           g_propagate_error (error, my_error);
 437           return NULL;
 438         }
 439
 440       srv_enum->srv->priv->targets = targets;
 441       srv_enum->t = srv_enum->srv->priv->targets;
 442     }
 443
 444   /* Delegate to GNetworkAddress */
 445   do
 446     {
 447       if (srv_enum->addr_enum == NULL && srv_enum->t)
 448         {
 449           GError *error = NULL;
 450           gchar *uri;
 451           gchar *hostname;
 452           GSocketConnectable *addr;
 453           GSrvTarget *target = srv_enum->t->data;
 454
 455           srv_enum->t = g_list_next (srv_enum->t);
 456
 457           hostname = g_hostname_to_ascii (g_srv_target_get_hostname (target));
 458
 459           if (hostname == NULL)
 460             {
 461               if (srv_enum->error == NULL)
 462                 srv_enum->error =
 463                   g_error_new (G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
 464                                "Received invalid hostname '%s' from GSrvTarget",
 465                                g_srv_target_get_hostname (target));
 466               continue;
 467             }
 468
 469           uri = _g_uri_from_authority (g_network_service_get_scheme (srv_enum->srv),
 470                                        hostname,
 471                                        g_srv_target_get_port (target),
 472                                        NULL);
 473           g_free (hostname);
 474
 475           addr = g_network_address_parse_uri (uri,
 476                                               g_srv_target_get_port (target),
 477                                               &error);
 478           g_free (uri);
 479
 480           if (addr == NULL)
 481             {
 482               if (srv_enum->error == NULL)
 483                 srv_enum->error = error;
 484               continue;
 485             }
 486
 487           if (srv_enum->use_proxy)
 488             srv_enum->addr_enum = g_socket_connectable_proxy_enumerate (addr);
 489           else
 490             srv_enum->addr_enum = g_socket_connectable_enumerate (addr);
 491           g_object_unref (addr);
 492         }
 493
 494       if (srv_enum->addr_enum)
 495         {
 496           GError *error = NULL;
 497
 498           ret = g_socket_address_enumerator_next (srv_enum->addr_enum,
 499                                                   cancellable,
 500                                                   &error);
 501
 502           if (error)
 503             {
 504               if (srv_enum->error == NULL)
 505                 srv_enum->error = error;
 506               else
 507                 g_error_free (error);
 508             }
 509
 510           if (!ret)
 511             {
 512               g_object_unref (srv_enum->addr_enum);
 513               srv_enum->addr_enum = NULL;
 514             }
 515         }
 516     }
 517   while (srv_enum->addr_enum == NULL && srv_enum->t);
 518
 519   if (ret == NULL && srv_enum->error)
 520     {
 521       g_propagate_error (error, srv_enum->error);
 522       srv_enum->error = NULL;
 523     }
 524
 525   return ret;
 526 }
 527
 528 static void next_async_resolved_targets   (GObject      *source_object,
 529                                            GAsyncResult *result,
 530                                            gpointer      user_data);
 531 static void next_async_have_targets       (GTask        *srv_enum);
 532 static void next_async_have_address       (GObject      *source_object,
 533                                            GAsyncResult *result,
 534                                            gpointer      user_data);
 535
 536 static void
 537 g_network_service_address_enumerator_next_async (GSocketAddressEnumerator  *enumerator,
 538                                                  GCancellable              *cancellable,
 539                                                  GAsyncReadyCallback        callback,
 540                                                  gpointer                   user_data)
 541 {
 542   GNetworkServiceAddressEnumerator *srv_enum =
 543     G_NETWORK_SERVICE_ADDRESS_ENUMERATOR (enumerator);
 544   GTask *task;
 545
 546   task = g_task_new (enumerator, cancellable, callback, user_data);
 547
 548   /* If we haven't yet resolved srv, do that */
 549   if (!srv_enum->srv->priv->targets)
 550     {
 551       g_resolver_lookup_service_async (srv_enum->resolver,
 552                                        srv_enum->srv->priv->service,
 553                                        srv_enum->srv->priv->protocol,
 554                                        srv_enum->srv->priv->domain,
 555                                        cancellable,
 556                                        next_async_resolved_targets,
 557                                        task);
 558     }
 559   else
 560     next_async_have_targets (task);
 561 }
 562
 563 static void
 564 next_async_resolved_targets (GObject      *source_object,
 565                              GAsyncResult *result,
 566                              gpointer      user_data)
 567 {
 568   GTask *task = user_data;
 569   GNetworkServiceAddressEnumerator *srv_enum = g_task_get_source_object (task);
 570   GError *error = NULL;
 571   GList *targets;
 572
 573   targets = g_resolver_lookup_service_finish (srv_enum->resolver,
 574                                               result, &error);
 575
 576   if (!targets && g_error_matches (error, G_RESOLVER_ERROR,
 577                                    G_RESOLVER_ERROR_NOT_FOUND))
 578     {
 579       targets = g_network_service_fallback_targets (srv_enum->srv);
 580       if (targets)
 581         g_clear_error (&error);
 582     }
 583
 584   if (error)
 585     {
 586       g_task_return_error (task, error);
 587       g_object_unref (task);
 588     }
 589   else
 590     {
 591       srv_enum->t = srv_enum->srv->priv->targets = targets;
 592       next_async_have_targets (task);
 593     }
 594 }
 595
 596 static void
 597 next_async_have_targets (GTask *task)
 598 {
 599   GNetworkServiceAddressEnumerator *srv_enum = g_task_get_source_object (task);
 600
 601   /* Delegate to GNetworkAddress */
 602   if (srv_enum->addr_enum == NULL && srv_enum->t)
 603     {
 604       GSocketConnectable *addr;
 605       GSrvTarget *target = srv_enum->t->data;
 606
 607       srv_enum->t = g_list_next (srv_enum->t);
 608       addr = g_network_address_new (g_srv_target_get_hostname (target),
 609                                     (guint16) g_srv_target_get_port (target));
 610
 611       if (srv_enum->use_proxy)
 612         srv_enum->addr_enum = g_socket_connectable_proxy_enumerate (addr);
 613       else
 614         srv_enum->addr_enum = g_socket_connectable_enumerate (addr);
 615
 616       g_object_unref (addr);
 617     }
 618
 619   if (srv_enum->addr_enum)
 620     {
 621       g_socket_address_enumerator_next_async (srv_enum->addr_enum,
 622                                               g_task_get_cancellable (task),
 623                                               next_async_have_address,
 624                                               task);
 625     }
 626   else
 627     {
 628       if (srv_enum->error)
 629         {
 630           g_task_return_error (task, srv_enum->error);
 631           srv_enum->error = NULL;
 632         }
 633       else
 634         g_task_return_pointer (task, NULL, NULL);
 635
 636       g_object_unref (task);
 637     }
 638 }
 639
 640 static void
 641 next_async_have_address (GObject      *source_object,
 642                          GAsyncResult *result,
 643                          gpointer      user_data)
 644 {
 645   GTask *task = user_data;
 646   GNetworkServiceAddressEnumerator *srv_enum = g_task_get_source_object (task);
 647   GSocketAddress *address;
 648   GError *error = NULL;
 649
 650   address = g_socket_address_enumerator_next_finish (srv_enum->addr_enum,
 651                                                      result,
 652                                                      &error);
 653
 654   if (error)
 655     {
 656       if (srv_enum->error == NULL)
 657         srv_enum->error = error;
 658       else
 659         g_error_free (error);
 660     }
 661
 662   if (!address)
 663     {
 664       g_object_unref (srv_enum->addr_enum);
 665       srv_enum->addr_enum = NULL;
 666
 667       next_async_have_targets (task);
 668     }
 669   else
 670     {
 671       g_task_return_pointer (task, address, g_object_unref);
 672       g_object_unref (task);
 673     }
 674 }
 675
 676 static GSocketAddress *
 677 g_network_service_address_enumerator_next_finish (GSocketAddressEnumerator  *enumerator,
 678                                                   GAsyncResult              *result,
 679                                                   GError                   **error)
 680 {
 681   return g_task_propagate_pointer (G_TASK (result), error);
 682 }
 683
 684 static void
 685 _g_network_service_address_enumerator_init (GNetworkServiceAddressEnumerator *enumerator)
 686 {
 687 }
 688
 689 static void
 690 g_network_service_address_enumerator_finalize (GObject *object)
 691 {
 692   GNetworkServiceAddressEnumerator *srv_enum =
 693     G_NETWORK_SERVICE_ADDRESS_ENUMERATOR (object);
 694
 695   if (srv_enum->srv)
 696     g_object_unref (srv_enum->srv);
 697
 698   if (srv_enum->addr_enum)
 699     g_object_unref (srv_enum->addr_enum);
 700
 701   if (srv_enum->resolver)
 702     g_object_unref (srv_enum->resolver);
 703
 704   if (srv_enum->error)
 705     g_error_free (srv_enum->error);
 706
 707   G_OBJECT_CLASS (_g_network_service_address_enumerator_parent_class)->finalize (object);
 708 }
 709
 710 static void
 711 _g_network_service_address_enumerator_class_init (GNetworkServiceAddressEnumeratorClass *srvenum_class)
 712 {
 713   GObjectClass *object_class = G_OBJECT_CLASS (srvenum_class);
 714   GSocketAddressEnumeratorClass *enumerator_class =
 715     G_SOCKET_ADDRESS_ENUMERATOR_CLASS (srvenum_class);
 716
 717   enumerator_class->next        = g_network_service_address_enumerator_next;
 718   enumerator_class->next_async  = g_network_service_address_enumerator_next_async;
 719   enumerator_class->next_finish = g_network_service_address_enumerator_next_finish;
 720
 721   object_class->finalize = g_network_service_address_enumerator_finalize;
 722 }
 723
 724 static GSocketAddressEnumerator *
 725 g_network_service_connectable_enumerate (GSocketConnectable *connectable)
 726 {
 727   GNetworkServiceAddressEnumerator *srv_enum;
 728
 729   srv_enum = g_object_new (G_TYPE_NETWORK_SERVICE_ADDRESS_ENUMERATOR, NULL);
 730   srv_enum->srv = g_object_ref (connectable);
 731   srv_enum->resolver = g_resolver_get_default ();
 732   srv_enum->use_proxy = FALSE;
 733
 734   return G_SOCKET_ADDRESS_ENUMERATOR (srv_enum);
 735 }
 736
 737 static GSocketAddressEnumerator *
 738 g_network_service_connectable_proxy_enumerate (GSocketConnectable *connectable)
 739 {
 740   GSocketAddressEnumerator *addr_enum;
 741   GNetworkServiceAddressEnumerator *srv_enum;
 742
 743   addr_enum = g_network_service_connectable_enumerate (connectable);
 744   srv_enum = G_NETWORK_SERVICE_ADDRESS_ENUMERATOR (addr_enum);
 745   srv_enum->use_proxy = TRUE;
 746
 747   return addr_enum;
 748 }