gio/gnetworkaddress.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 <stdlib.h>
  28 #include "gnetworkaddress.h"
  29 #include "gasyncresult.h"
  30 #include "ginetaddress.h"
  31 #include "ginetsocketaddress.h"
  32 #include "gnetworkingprivate.h"
  33 #include "gproxyaddressenumerator.h"
  34 #include "gresolver.h"
  35 #include "gsimpleasyncresult.h"
  36 #include "gsocketaddressenumerator.h"
  37 #include "gioerror.h"
  38 #include "gsocketconnectable.h"
  39
  40 #include <string.h>
  41
  42
  43 /**
  44  * SECTION:gnetworkaddress
  45  * @short_description: A GSocketConnectable for resolving hostnames
  46  * @include: gio/gio.h
  47  *
  48  * #GNetworkAddress provides an easy way to resolve a hostname and
  49  * then attempt to connect to that host, handling the possibility of
  50  * multiple IP addresses and multiple address families.
  51  *
  52  * See #GSocketConnectable for and example of using the connectable
  53  * interface.
  54  */
  55
  56 /**
  57  * GNetworkAddress:
  58  *
  59  * A #GSocketConnectable for resolving a hostname and connecting to
  60  * that host.
  61  */
  62
  63 struct _GNetworkAddressPrivate {
  64   gchar *hostname;
  65   guint16 port;
  66   GList *sockaddrs;
  67   gchar *scheme;
  68 };
  69
  70 enum {
  71   PROP_0,
  72   PROP_HOSTNAME,
  73   PROP_PORT,
  74   PROP_SCHEME,
  75 };
  76
  77 static void g_network_address_set_property (GObject      *object,
  78                                             guint         prop_id,
  79                                             const GValue *value,
  80                                             GParamSpec   *pspec);
  81 static void g_network_address_get_property (GObject      *object,
  82                                             guint         prop_id,
  83                                             GValue       *value,
  84                                             GParamSpec   *pspec);
  85
  86 static void                      g_network_address_connectable_iface_init       (GSocketConnectableIface *iface);
  87 static GSocketAddressEnumerator *g_network_address_connectable_enumerate        (GSocketConnectable      *connectable);
  88 static GSocketAddressEnumerator *g_network_address_connectable_proxy_enumerate  (GSocketConnectable      *connectable);
  89
  90 G_DEFINE_TYPE_WITH_CODE (GNetworkAddress, g_network_address, G_TYPE_OBJECT,
  91                          G_IMPLEMENT_INTERFACE (G_TYPE_SOCKET_CONNECTABLE,
  92                                                 g_network_address_connectable_iface_init))
  93
  94 static void
  95 g_network_address_finalize (GObject *object)
  96 {
  97   GNetworkAddress *addr = G_NETWORK_ADDRESS (object);
  98
  99   g_free (addr->priv->hostname);
 100   g_free (addr->priv->scheme);
 101
 102   if (addr->priv->sockaddrs)
 103     {
 104       GList *a;
 105
 106       for (a = addr->priv->sockaddrs; a; a = a->next)
 107         g_object_unref (a->data);
 108       g_list_free (addr->priv->sockaddrs);
 109     }
 110
 111   G_OBJECT_CLASS (g_network_address_parent_class)->finalize (object);
 112 }
 113
 114 static void
 115 g_network_address_class_init (GNetworkAddressClass *klass)
 116 {
 117   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 118
 119   g_type_class_add_private (klass, sizeof (GNetworkAddressPrivate));
 120
 121   gobject_class->set_property = g_network_address_set_property;
 122   gobject_class->get_property = g_network_address_get_property;
 123   gobject_class->finalize = g_network_address_finalize;
 124
 125   g_object_class_install_property (gobject_class, PROP_HOSTNAME,
 126                                    g_param_spec_string ("hostname",
 127                                                         P_("Hostname"),
 128                                                         P_("Hostname to resolve"),
 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_PORT,
 134                                    g_param_spec_uint ("port",
 135                                                       P_("Port"),
 136                                                       P_("Network port"),
 137                                                       0, 65535, 0,
 138                                                       G_PARAM_READWRITE |
 139                                                       G_PARAM_CONSTRUCT_ONLY |
 140                                                       G_PARAM_STATIC_STRINGS));
 141
 142   g_object_class_install_property (gobject_class, PROP_SCHEME,
 143                                    g_param_spec_string ("scheme",
 144                                                         P_("Scheme"),
 145                                                         P_("URI Scheme"),
 146                                                         NULL,
 147                                                         G_PARAM_READWRITE |
 148                                                         G_PARAM_CONSTRUCT_ONLY |
 149                                                         G_PARAM_STATIC_STRINGS));
 150 }
 151
 152 static void
 153 g_network_address_connectable_iface_init (GSocketConnectableIface *connectable_iface)
 154 {
 155   connectable_iface->enumerate  = g_network_address_connectable_enumerate;
 156   connectable_iface->proxy_enumerate = g_network_address_connectable_proxy_enumerate;
 157 }
 158
 159 static void
 160 g_network_address_init (GNetworkAddress *addr)
 161 {
 162   addr->priv = G_TYPE_INSTANCE_GET_PRIVATE (addr, G_TYPE_NETWORK_ADDRESS,
 163                                             GNetworkAddressPrivate);
 164 }
 165
 166 static void
 167 g_network_address_set_property (GObject      *object,
 168                                 guint         prop_id,
 169                                 const GValue *value,
 170                                 GParamSpec   *pspec)
 171 {
 172   GNetworkAddress *addr = G_NETWORK_ADDRESS (object);
 173
 174   switch (prop_id)
 175     {
 176     case PROP_HOSTNAME:
 177       g_free (addr->priv->hostname);
 178       addr->priv->hostname = g_value_dup_string (value);
 179       break;
 180
 181     case PROP_PORT:
 182       addr->priv->port = g_value_get_uint (value);
 183       break;
 184
 185     case PROP_SCHEME:
 186       if (addr->priv->scheme)
 187         g_free (addr->priv->scheme);
 188       addr->priv->scheme = g_value_dup_string (value);
 189       break;
 190
 191     default:
 192       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 193       break;
 194     }
 195
 196 }
 197
 198 static void
 199 g_network_address_get_property (GObject    *object,
 200                                 guint       prop_id,
 201                                 GValue     *value,
 202                                 GParamSpec *pspec)
 203 {
 204   GNetworkAddress *addr = G_NETWORK_ADDRESS (object);
 205
 206   switch (prop_id)
 207     {
 208     case PROP_HOSTNAME:
 209       g_value_set_string (value, addr->priv->hostname);
 210       break;
 211
 212     case PROP_PORT:
 213       g_value_set_uint (value, addr->priv->port);
 214       break;
 215
 216     case PROP_SCHEME:
 217       g_value_set_string (value, addr->priv->scheme);
 218       break;
 219
 220     default:
 221       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 222       break;
 223     }
 224
 225 }
 226
 227 static void
 228 g_network_address_set_addresses (GNetworkAddress *addr,
 229                                  GList           *addresses)
 230 {
 231   GList *a;
 232   GSocketAddress *sockaddr;
 233
 234   g_return_if_fail (addresses != NULL && addr->priv->sockaddrs == NULL);
 235
 236   for (a = addresses; a; a = a->next)
 237     {
 238       sockaddr = g_inet_socket_address_new (a->data, addr->priv->port);
 239       addr->priv->sockaddrs = g_list_prepend (addr->priv->sockaddrs, sockaddr);
 240       g_object_unref (a->data);
 241     }
 242   g_list_free (addresses);
 243   addr->priv->sockaddrs = g_list_reverse (addr->priv->sockaddrs);
 244 }
 245
 246 /**
 247  * g_network_address_new:
 248  * @hostname: the hostname
 249  * @port: the port
 250  *
 251  * Creates a new #GSocketConnectable for connecting to the given
 252  * @hostname and @port.
 253  *
 254  * Return value: the new #GNetworkAddress
 255  *
 256  * Since: 2.22
 257  */
 258 GSocketConnectable *
 259 g_network_address_new (const gchar *hostname,
 260                        guint16      port)
 261 {
 262   return g_object_new (G_TYPE_NETWORK_ADDRESS,
 263                        "hostname", hostname,
 264                        "port", port,
 265                        NULL);
 266 }
 267
 268 /**
 269  * g_network_address_parse:
 270  * @host_and_port: the hostname and optionally a port
 271  * @default_port: the default port if not in @host_and_port
 272  * @error: a pointer to a #GError, or %NULL
 273  *
 274  * Creates a new #GSocketConnectable for connecting to the given
 275  * @hostname and @port. May fail and return %NULL in case
 276  * parsing @host_and_port fails.
 277  *
 278  * @host_and_port may be in any of a number of recognised formats: an IPv6
 279  * address, an IPv4 address, or a domain name (in which case a DNS
 280  * lookup is performed). Quoting with [] is supported for all address
 281  * types. A port override may be specified in the usual way with a
 282  * colon. Ports may be given as decimal numbers or symbolic names (in
 283  * which case an /etc/services lookup is performed).
 284  *
 285  * If no port is specified in @host_and_port then @default_port will be
 286  * used as the port number to connect to.
 287  *
 288  * In general, @host_and_port is expected to be provided by the user
 289  * (allowing them to give the hostname, and a port overide if necessary)
 290  * and @default_port is expected to be provided by the application.
 291  *
 292  * Return value: the new #GNetworkAddress, or %NULL on error
 293  *
 294  * Since: 2.22
 295  */
 296 GSocketConnectable *
 297 g_network_address_parse (const gchar  *host_and_port,
 298                          guint16       default_port,
 299                          GError      **error)
 300 {
 301   GSocketConnectable *connectable;
 302   const gchar *port;
 303   guint16 portnum;
 304   gchar *name;
 305
 306   g_return_val_if_fail (host_and_port != NULL, NULL);
 307
 308   port = NULL;
 309   if (host_and_port[0] == '[')
 310     /* escaped host part (to allow, eg. "[2001:db8::1]:888") */
 311     {
 312       const gchar *end;
 313
 314       end = strchr (host_and_port, ']');
 315       if (end == NULL)
 316         {
 317           g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
 318                        _("Hostname '%s' contains '[' but not ']'"), host_and_port);
 319           return NULL;
 320         }
 321
 322       if (end[1] == '\0')
 323         port = NULL;
 324       else if (end[1] == ':')
 325         port = &end[2];
 326       else
 327         {
 328           g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
 329                        "The ']' character (in hostname '%s') must come at the"
 330                        " end or be immediately followed by ':' and a port",
 331                        host_and_port);
 332           return NULL;
 333         }
 334
 335       name = g_strndup (host_and_port + 1, end - host_and_port - 1);
 336     }
 337
 338   else if ((port = strchr (host_and_port, ':')))
 339     /* string has a ':' in it */
 340     {
 341       /* skip ':' */
 342       port++;
 343
 344       if (strchr (port, ':'))
 345         /* more than one ':' in string */
 346         {
 347           /* this is actually an unescaped IPv6 address */
 348           name = g_strdup (host_and_port);
 349           port = NULL;
 350         }
 351       else
 352         name = g_strndup (host_and_port, port - host_and_port - 1);
 353     }
 354
 355   else
 356     /* plain hostname, no port */
 357     name = g_strdup (host_and_port);
 358
 359   if (port != NULL)
 360     {
 361       if (port[0] == '\0')
 362         {
 363           g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
 364                        "If a ':' character is given, it must be followed by a "
 365                        "port (in hostname '%s').", host_and_port);
 366           g_free (name);
 367           return NULL;
 368         }
 369
 370       else if ('0' <= port[0] && port[0] <= '9')
 371         {
 372           char *end;
 373           long value;
 374
 375           value = strtol (port, &end, 10);
 376           if (*end != '\0' || value < 0 || value > G_MAXUINT16)
 377             {
 378               g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
 379                            "Invalid numeric port '%s' specified in hostname '%s'",
 380                            port, host_and_port);
 381               g_free (name);
 382               return NULL;
 383             }
 384
 385           portnum = value;
 386         }
 387
 388       else
 389         {
 390           struct servent *entry;
 391
 392           entry = getservbyname (port, "tcp");
 393           if (entry == NULL)
 394             {
 395               g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
 396                            "Unknown service '%s' specified in hostname '%s'",
 397                            port, host_and_port);
 398 #ifdef HAVE_ENDSERVENT
 399               endservent ();
 400 #endif
 401               g_free (name);
 402               return NULL;
 403             }
 404
 405           portnum = g_ntohs (entry->s_port);
 406
 407 #ifdef HAVE_ENDSERVENT
 408           endservent ();
 409 #endif
 410         }
 411     }
 412   else
 413     {
 414       /* No port in host_and_port */
 415       portnum = default_port;
 416     }
 417
 418   connectable = g_network_address_new (name, portnum);
 419   g_free (name);
 420
 421   return connectable;
 422 }
 423
 424 /* Allowed characters outside alphanumeric for unreserved. */
 425 #define G_URI_OTHER_UNRESERVED "-._~"
 426
 427 /* This or something equivalent will eventually go into glib/guri.h */
 428 gboolean
 429 _g_uri_parse_authority (const char  *uri,
 430                         char       **host,
 431                         guint16     *port,
 432                         char       **userinfo)
 433 {
 434   char *tmp_str;
 435   const char *start, *p;
 436   char c;
 437
 438   g_return_val_if_fail (uri != NULL, FALSE);
 439
 440   if (host)
 441     *host = NULL;
 442
 443   if (port)
 444     *port = 0;
 445
 446   if (userinfo)
 447     *userinfo = NULL;
 448
 449   /* From RFC 3986 Decodes:
 450    * URI          = scheme ":" hier-part [ "?" query ] [ "#" fragment ]
 451    * hier-part    = "//" authority path-abempty
 452    * path-abempty = *( "/" segment )
 453    * authority    = [ userinfo "@" ] host [ ":" port ]
 454    */
 455
 456   /* Check we have a valid scheme */
 457   tmp_str = g_uri_parse_scheme (uri);
 458
 459   if (tmp_str == NULL)
 460     return FALSE;
 461
 462   g_free (tmp_str);
 463
 464   /* Decode hier-part:
 465    *  hier-part   = "//" authority path-abempty
 466    */
 467   p = uri;
 468   start = strstr (p, "//");
 469
 470   if (start == NULL)
 471     return FALSE;
 472
 473   start += 2;
 474   p = strchr (start, '@');
 475
 476   if (p != NULL)
 477     {
 478       /* Decode userinfo:
 479        * userinfo      = *( unreserved / pct-encoded / sub-delims / ":" )
 480        * unreserved    = ALPHA / DIGIT / "-" / "." / "_" / "~"
 481        * pct-encoded   = "%" HEXDIG HEXDIG
 482        */
 483       while (1)
 484         {
 485           c = *p++;
 486
 487           if (c == '@')
 488             break;
 489
 490           /* pct-encoded */
 491           if (c == '%')
 492             {
 493               if (!(g_ascii_isxdigit (p[0]) ||
 494                     g_ascii_isxdigit (p[1])))
 495                 return FALSE;
 496
 497               p++;
 498
 499               continue;
 500             }
 501
 502           /* unreserved /  sub-delims / : */
 503           if (!(g_ascii_isalnum(c) ||
 504                 strchr (G_URI_OTHER_UNRESERVED, c) ||
 505                 strchr (G_URI_RESERVED_CHARS_SUBCOMPONENT_DELIMITERS, c) ||
 506                 c == ':'))
 507             return FALSE;
 508         }
 509
 510       if (userinfo)
 511         *userinfo = g_strndup (start, p - start - 1);
 512
 513       start = p;
 514     }
 515   else
 516     {
 517       p = start;
 518     }
 519
 520
 521   /* decode host:
 522    * host          = IP-literal / IPv4address / reg-name
 523    * reg-name      = *( unreserved / pct-encoded / sub-delims )
 524    */
 525
 526   /* If IPv6 or IPvFuture */
 527   if (*p == '[')
 528     {
 529       while (1)
 530         {
 531           c = *p++;
 532
 533           if (c == ']')
 534             break;
 535
 536           /* unreserved /  sub-delims */
 537           if (!(g_ascii_isalnum(c) ||
 538                 strchr (G_URI_OTHER_UNRESERVED, c) ||
 539                 strchr (G_URI_RESERVED_CHARS_SUBCOMPONENT_DELIMITERS, c) ||
 540                 c == ':' ||
 541                 c == '.'))
 542             goto error;
 543         }
 544     }
 545   else
 546     {
 547       while (1)
 548         {
 549           c = *p++;
 550
 551           if (c == ':' ||
 552               c == '/' ||
 553               c == '?' ||
 554               c == '#' ||
 555               c == '\0')
 556             break;
 557
 558           /* pct-encoded */
 559           if (c == '%')
 560             {
 561               if (!(g_ascii_isxdigit (p[0]) ||
 562                     g_ascii_isxdigit (p[1])))
 563                 goto error;
 564
 565               p++;
 566
 567               continue;
 568             }
 569
 570           /* unreserved /  sub-delims */
 571           if (!(g_ascii_isalnum(c) ||
 572                 strchr (G_URI_OTHER_UNRESERVED, c) ||
 573                 strchr (G_URI_RESERVED_CHARS_SUBCOMPONENT_DELIMITERS, c)))
 574             goto error;
 575         }
 576     }
 577
 578   if (host)
 579     *host = g_uri_unescape_segment (start, p - 1, NULL);
 580
 581   if (c == ':')
 582     {
 583       /* Decode pot:
 584        *  port          = *DIGIT
 585        */
 586       guint tmp = 0;
 587
 588       while (1)
 589         {
 590           c = *p++;
 591
 592           if (c == '/' ||
 593               c == '?' ||
 594               c == '#' ||
 595               c == '\0')
 596             break;
 597
 598           if (!g_ascii_isdigit (c))
 599             goto error;
 600
 601           tmp = (tmp * 10) + (c - '0');
 602
 603           if (tmp > 65535)
 604             goto error;
 605         }
 606       if (port)
 607         *port = (guint16) tmp;
 608     }
 609
 610   return TRUE;
 611
 612 error:
 613   if (host && *host)
 614     {
 615       g_free (*host);
 616       *host = NULL;
 617     }
 618
 619   if (userinfo && *userinfo)
 620     {
 621       g_free (*userinfo);
 622       *userinfo = NULL;
 623     }
 624
 625   return FALSE;
 626 }
 627
 628 /**
 629  * g_network_address_parse_uri:
 630  * @uri: the hostname and optionally a port
 631  * @default_port: The default port if none is found in the URI
 632  * @error: a pointer to a #GError, or %NULL
 633  *
 634  * Creates a new #GSocketConnectable for connecting to the given
 635  * @uri. May fail and return %NULL in case parsing @uri fails.
 636  *
 637  * Using this rather than g_network_address_new() or
 638  * g_network_address_parse_host() allows #GSocketClient to determine
 639  * when to use application-specific proxy protocols.
 640  *
 641  * Return value: the new #GNetworkAddress, or %NULL on error
 642  *
 643  * Since: 2.26
 644  */
 645 GSocketConnectable *
 646 g_network_address_parse_uri (const gchar  *uri,
 647                              guint16       default_port,
 648                              GError      **error)
 649 {
 650   GSocketConnectable *conn;
 651   gchar *scheme;
 652   gchar *hostname;
 653   guint16 port;
 654
 655   if (!_g_uri_parse_authority (uri, &hostname, &port, NULL))
 656     {
 657       g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
 658                    "Invalid URI '%s'",
 659                    uri);
 660       return NULL;
 661     }
 662
 663   if (port == 0)
 664     port = default_port;
 665
 666   scheme = g_uri_parse_scheme (uri);
 667
 668   conn = g_object_new (G_TYPE_NETWORK_ADDRESS,
 669                        "hostname", hostname,
 670                        "port", port,
 671                        "scheme", scheme,
 672                        NULL);
 673
 674   g_free (scheme);
 675   g_free (hostname);
 676
 677   return conn;
 678 }
 679
 680 /**
 681  * g_network_address_get_hostname:
 682  * @addr: a #GNetworkAddress
 683  *
 684  * Gets @addr's hostname. This might be either UTF-8 or ASCII-encoded,
 685  * depending on what @addr was created with.
 686  *
 687  * Return value: @addr's hostname
 688  *
 689  * Since: 2.22
 690  */
 691 const gchar *
 692 g_network_address_get_hostname (GNetworkAddress *addr)
 693 {
 694   g_return_val_if_fail (G_IS_NETWORK_ADDRESS (addr), NULL);
 695
 696   return addr->priv->hostname;
 697 }
 698
 699 /**
 700  * g_network_address_get_port:
 701  * @addr: a #GNetworkAddress
 702  *
 703  * Gets @addr's port number
 704  *
 705  * Return value: @addr's port (which may be 0)
 706  *
 707  * Since: 2.22
 708  */
 709 guint16
 710 g_network_address_get_port (GNetworkAddress *addr)
 711 {
 712   g_return_val_if_fail (G_IS_NETWORK_ADDRESS (addr), 0);
 713
 714   return addr->priv->port;
 715 }
 716
 717 /**
 718  * g_network_address_get_scheme:
 719  * @addr: a #GNetworkAddress
 720  *
 721  * Gets @addr's scheme
 722  *
 723  * Return value: @addr's scheme (%NULL if not built from URI)
 724  *
 725  * Since: 2.26
 726  */
 727 const gchar *
 728 g_network_address_get_scheme (GNetworkAddress *addr)
 729 {
 730   g_return_val_if_fail (G_IS_NETWORK_ADDRESS (addr), NULL);
 731
 732   return addr->priv->scheme;
 733 }
 734
 735 #define G_TYPE_NETWORK_ADDRESS_ADDRESS_ENUMERATOR (_g_network_address_address_enumerator_get_type ())
 736 #define G_NETWORK_ADDRESS_ADDRESS_ENUMERATOR(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), G_TYPE_NETWORK_ADDRESS_ADDRESS_ENUMERATOR, GNetworkAddressAddressEnumerator))
 737
 738 typedef struct {
 739   GSocketAddressEnumerator parent_instance;
 740
 741   GNetworkAddress *addr;
 742   GList *a;
 743 } GNetworkAddressAddressEnumerator;
 744
 745 typedef struct {
 746   GSocketAddressEnumeratorClass parent_class;
 747
 748 } GNetworkAddressAddressEnumeratorClass;
 749
 750 G_DEFINE_TYPE (GNetworkAddressAddressEnumerator, _g_network_address_address_enumerator, G_TYPE_SOCKET_ADDRESS_ENUMERATOR)
 751
 752 static void
 753 g_network_address_address_enumerator_finalize (GObject *object)
 754 {
 755   GNetworkAddressAddressEnumerator *addr_enum =
 756     G_NETWORK_ADDRESS_ADDRESS_ENUMERATOR (object);
 757
 758   g_object_unref (addr_enum->addr);
 759
 760   G_OBJECT_CLASS (_g_network_address_address_enumerator_parent_class)->finalize (object);
 761 }
 762
 763 static GSocketAddress *
 764 g_network_address_address_enumerator_next (GSocketAddressEnumerator  *enumerator,
 765                                            GCancellable              *cancellable,
 766                                            GError                   **error)
 767 {
 768   GNetworkAddressAddressEnumerator *addr_enum =
 769     G_NETWORK_ADDRESS_ADDRESS_ENUMERATOR (enumerator);
 770   GSocketAddress *sockaddr;
 771
 772   if (!addr_enum->addr->priv->sockaddrs)
 773     {
 774       GResolver *resolver = g_resolver_get_default ();
 775       GList *addresses;
 776
 777       addresses = g_resolver_lookup_by_name (resolver,
 778                                              addr_enum->addr->priv->hostname,
 779                                              cancellable, error);
 780       g_object_unref (resolver);
 781
 782       if (!addresses)
 783         return NULL;
 784
 785       g_network_address_set_addresses (addr_enum->addr, addresses);
 786       addr_enum->a = addr_enum->addr->priv->sockaddrs;
 787     }
 788
 789   if (!addr_enum->a)
 790     return NULL;
 791   else
 792     {
 793       sockaddr = addr_enum->a->data;
 794       addr_enum->a = addr_enum->a->next;
 795       return g_object_ref (sockaddr);
 796     }
 797 }
 798
 799 static void
 800 got_addresses (GObject      *source_object,
 801                GAsyncResult *result,
 802                gpointer      user_data)
 803 {
 804   GSimpleAsyncResult *simple = user_data;
 805   GNetworkAddressAddressEnumerator *addr_enum =
 806     g_simple_async_result_get_op_res_gpointer (simple);
 807   GResolver *resolver = G_RESOLVER (source_object);
 808   GList *addresses;
 809   GError *error = NULL;
 810
 811   addresses = g_resolver_lookup_by_name_finish (resolver, result, &error);
 812   if (!addr_enum->addr->priv->sockaddrs)
 813     {
 814       if (error)
 815         {
 816           g_simple_async_result_set_from_error (simple, error);
 817           g_error_free (error);
 818         }
 819       else
 820         {
 821           g_network_address_set_addresses (addr_enum->addr, addresses);
 822           addr_enum->a = addr_enum->addr->priv->sockaddrs;
 823         }
 824     }
 825   else if (error)
 826     g_error_free (error);
 827
 828   g_object_unref (resolver);
 829
 830   g_simple_async_result_complete (simple);
 831   g_object_unref (simple);
 832 }
 833
 834 static void
 835 g_network_address_address_enumerator_next_async (GSocketAddressEnumerator  *enumerator,
 836                                                  GCancellable              *cancellable,
 837                                                  GAsyncReadyCallback        callback,
 838                                                  gpointer                   user_data)
 839 {
 840   GNetworkAddressAddressEnumerator *addr_enum =
 841     G_NETWORK_ADDRESS_ADDRESS_ENUMERATOR (enumerator);
 842   GSimpleAsyncResult *simple;
 843
 844   simple = g_simple_async_result_new (G_OBJECT (enumerator),
 845                                       callback, user_data,
 846                                       g_network_address_address_enumerator_next_async);
 847
 848   if (!addr_enum->addr->priv->sockaddrs)
 849     {
 850       GResolver *resolver = g_resolver_get_default ();
 851
 852       g_simple_async_result_set_op_res_gpointer (simple, g_object_ref (addr_enum), g_object_unref);
 853       g_resolver_lookup_by_name_async (resolver,
 854                                        addr_enum->addr->priv->hostname,
 855                                        cancellable,
 856                                        got_addresses, simple);
 857     }
 858   else
 859     {
 860       g_simple_async_result_complete_in_idle (simple);
 861       g_object_unref (simple);
 862     }
 863 }
 864
 865 static GSocketAddress *
 866 g_network_address_address_enumerator_next_finish (GSocketAddressEnumerator  *enumerator,
 867                                                   GAsyncResult              *result,
 868                                                   GError                   **error)
 869 {
 870   GNetworkAddressAddressEnumerator *addr_enum =
 871     G_NETWORK_ADDRESS_ADDRESS_ENUMERATOR (enumerator);
 872   GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (result);
 873   GSocketAddress *sockaddr;
 874
 875   if (g_simple_async_result_propagate_error (simple, error))
 876     return NULL;
 877   else if (!addr_enum->a)
 878     return NULL;
 879   else
 880     {
 881       sockaddr = addr_enum->a->data;
 882       addr_enum->a = addr_enum->a->next;
 883       return g_object_ref (sockaddr);
 884     }
 885 }
 886
 887 static void
 888 _g_network_address_address_enumerator_init (GNetworkAddressAddressEnumerator *enumerator)
 889 {
 890 }
 891
 892 static void
 893 _g_network_address_address_enumerator_class_init (GNetworkAddressAddressEnumeratorClass *addrenum_class)
 894 {
 895   GObjectClass *object_class = G_OBJECT_CLASS (addrenum_class);
 896   GSocketAddressEnumeratorClass *enumerator_class =
 897     G_SOCKET_ADDRESS_ENUMERATOR_CLASS (addrenum_class);
 898
 899   enumerator_class->next = g_network_address_address_enumerator_next;
 900   enumerator_class->next_async = g_network_address_address_enumerator_next_async;
 901   enumerator_class->next_finish = g_network_address_address_enumerator_next_finish;
 902   object_class->finalize = g_network_address_address_enumerator_finalize;
 903 }
 904
 905 static GSocketAddressEnumerator *
 906 g_network_address_connectable_enumerate (GSocketConnectable *connectable)
 907 {
 908   GNetworkAddressAddressEnumerator *addr_enum;
 909
 910   addr_enum = g_object_new (G_TYPE_NETWORK_ADDRESS_ADDRESS_ENUMERATOR, NULL);
 911   addr_enum->addr = g_object_ref (connectable);
 912
 913   return (GSocketAddressEnumerator *)addr_enum;
 914 }
 915
 916 static GSocketAddressEnumerator *
 917 g_network_address_connectable_proxy_enumerate (GSocketConnectable *connectable)
 918 {
 919   GNetworkAddress *self = G_NETWORK_ADDRESS (connectable);
 920   GSocketAddressEnumerator *proxy_enum;
 921   gchar *uri;
 922
 923   uri = g_strdup_printf ("%s://%s:%u",
 924                          self->priv->scheme ? self->priv->scheme : "none",
 925                          self->priv->hostname, self->priv->port);
 926
 927   proxy_enum = g_object_new (G_TYPE_PROXY_ADDRESS_ENUMERATOR,
 928                              "connectable", connectable,
 929                              "uri", uri,
 930                              NULL);
 931
 932   g_free (uri);
 933
 934   return proxy_enum;
 935 }