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, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include "config.h"
  22 #include <glib.h>
  23 #include "glibintl.h"
  24
  25 #include <stdlib.h>
  26 #include "gnetworkaddress.h"
  27 #include "gasyncresult.h"
  28 #include "ginetaddress.h"
  29 #include "ginetsocketaddress.h"
  30 #include "gnetworkingprivate.h"
  31 #include "gproxyaddressenumerator.h"
  32 #include "gresolver.h"
  33 #include "gtask.h"
  34 #include "gsocketaddressenumerator.h"
  35 #include "gioerror.h"
  36 #include "gsocketconnectable.h"
  37
  38 #include <string.h>
  39
  40
  41 /**
  42  * SECTION:gnetworkaddress
  43  * @short_description: A GSocketConnectable for resolving hostnames
  44  * @include: gio/gio.h
  45  *
  46  * #GNetworkAddress provides an easy way to resolve a hostname and
  47  * then attempt to connect to that host, handling the possibility of
  48  * multiple IP addresses and multiple address families.
  49  *
  50  * See #GSocketConnectable for and example of using the connectable
  51  * interface.
  52  */
  53
  54 /**
  55  * GNetworkAddress:
  56  *
  57  * A #GSocketConnectable for resolving a hostname and connecting to
  58  * that host.
  59  */
  60
  61 struct _GNetworkAddressPrivate {
  62   gchar *hostname;
  63   guint16 port;
  64   GList *sockaddrs;
  65   gchar *scheme;
  66
  67   gint64 resolver_serial;
  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_ADD_PRIVATE (GNetworkAddress)
  92                          G_IMPLEMENT_INTERFACE (G_TYPE_SOCKET_CONNECTABLE,
  93                                                 g_network_address_connectable_iface_init))
  94
  95 static void
  96 g_network_address_finalize (GObject *object)
  97 {
  98   GNetworkAddress *addr = G_NETWORK_ADDRESS (object);
  99
 100   g_free (addr->priv->hostname);
 101   g_free (addr->priv->scheme);
 102
 103   if (addr->priv->sockaddrs)
 104     {
 105       GList *a;
 106
 107       for (a = addr->priv->sockaddrs; a; a = a->next)
 108         g_object_unref (a->data);
 109       g_list_free (addr->priv->sockaddrs);
 110     }
 111
 112   G_OBJECT_CLASS (g_network_address_parent_class)->finalize (object);
 113 }
 114
 115 static void
 116 g_network_address_class_init (GNetworkAddressClass *klass)
 117 {
 118   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 119
 120   gobject_class->set_property = g_network_address_set_property;
 121   gobject_class->get_property = g_network_address_get_property;
 122   gobject_class->finalize = g_network_address_finalize;
 123
 124   g_object_class_install_property (gobject_class, PROP_HOSTNAME,
 125                                    g_param_spec_string ("hostname",
 126                                                         P_("Hostname"),
 127                                                         P_("Hostname to resolve"),
 128                                                         NULL,
 129                                                         G_PARAM_READWRITE |
 130                                                         G_PARAM_CONSTRUCT_ONLY |
 131                                                         G_PARAM_STATIC_STRINGS));
 132   g_object_class_install_property (gobject_class, PROP_PORT,
 133                                    g_param_spec_uint ("port",
 134                                                       P_("Port"),
 135                                                       P_("Network port"),
 136                                                       0, 65535, 0,
 137                                                       G_PARAM_READWRITE |
 138                                                       G_PARAM_CONSTRUCT_ONLY |
 139                                                       G_PARAM_STATIC_STRINGS));
 140
 141   g_object_class_install_property (gobject_class, PROP_SCHEME,
 142                                    g_param_spec_string ("scheme",
 143                                                         P_("Scheme"),
 144                                                         P_("URI Scheme"),
 145                                                         NULL,
 146                                                         G_PARAM_READWRITE |
 147                                                         G_PARAM_CONSTRUCT_ONLY |
 148                                                         G_PARAM_STATIC_STRINGS));
 149 }
 150
 151 static void
 152 g_network_address_connectable_iface_init (GSocketConnectableIface *connectable_iface)
 153 {
 154   connectable_iface->enumerate  = g_network_address_connectable_enumerate;
 155   connectable_iface->proxy_enumerate = g_network_address_connectable_proxy_enumerate;
 156 }
 157
 158 static void
 159 g_network_address_init (GNetworkAddress *addr)
 160 {
 161   addr->priv = g_network_address_get_instance_private (addr);
 162 }
 163
 164 static void
 165 g_network_address_set_property (GObject      *object,
 166                                 guint         prop_id,
 167                                 const GValue *value,
 168                                 GParamSpec   *pspec)
 169 {
 170   GNetworkAddress *addr = G_NETWORK_ADDRESS (object);
 171
 172   switch (prop_id)
 173     {
 174     case PROP_HOSTNAME:
 175       g_free (addr->priv->hostname);
 176       addr->priv->hostname = g_value_dup_string (value);
 177       break;
 178
 179     case PROP_PORT:
 180       addr->priv->port = g_value_get_uint (value);
 181       break;
 182
 183     case PROP_SCHEME:
 184       if (addr->priv->scheme)
 185         g_free (addr->priv->scheme);
 186       addr->priv->scheme = g_value_dup_string (value);
 187       break;
 188
 189     default:
 190       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 191       break;
 192     }
 193
 194 }
 195
 196 static void
 197 g_network_address_get_property (GObject    *object,
 198                                 guint       prop_id,
 199                                 GValue     *value,
 200                                 GParamSpec *pspec)
 201 {
 202   GNetworkAddress *addr = G_NETWORK_ADDRESS (object);
 203
 204   switch (prop_id)
 205     {
 206     case PROP_HOSTNAME:
 207       g_value_set_string (value, addr->priv->hostname);
 208       break;
 209
 210     case PROP_PORT:
 211       g_value_set_uint (value, addr->priv->port);
 212       break;
 213
 214     case PROP_SCHEME:
 215       g_value_set_string (value, addr->priv->scheme);
 216       break;
 217
 218     default:
 219       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 220       break;
 221     }
 222
 223 }
 224
 225 static void
 226 g_network_address_set_addresses (GNetworkAddress *addr,
 227                                  GList           *addresses,
 228                                  guint64          resolver_serial)
 229 {
 230   GList *a;
 231   GSocketAddress *sockaddr;
 232
 233   g_return_if_fail (addresses != NULL && addr->priv->sockaddrs == NULL);
 234
 235   for (a = addresses; a; a = a->next)
 236     {
 237       sockaddr = g_inet_socket_address_new (a->data, addr->priv->port);
 238       addr->priv->sockaddrs = g_list_prepend (addr->priv->sockaddrs, sockaddr);
 239       g_object_unref (a->data);
 240     }
 241   g_list_free (addresses);
 242   addr->priv->sockaddrs = g_list_reverse (addr->priv->sockaddrs);
 243
 244   addr->priv->resolver_serial = resolver_serial;
 245 }
 246
 247 static gboolean
 248 g_network_address_parse_sockaddr (GNetworkAddress *addr)
 249 {
 250   GSocketAddress *sockaddr;
 251
 252   sockaddr = g_inet_socket_address_new_from_string (addr->priv->hostname,
 253                                                     addr->priv->port);
 254   if (sockaddr)
 255     {
 256       addr->priv->sockaddrs = g_list_prepend (addr->priv->sockaddrs, sockaddr);
 257       return TRUE;
 258     }
 259   else
 260     return FALSE;
 261 }
 262
 263 /**
 264  * g_network_address_new:
 265  * @hostname: the hostname
 266  * @port: the port
 267  *
 268  * Creates a new #GSocketConnectable for connecting to the given
 269  * @hostname and @port.
 270  *
 271  * Returns: (transfer full) (type GNetworkAddress): the new #GNetworkAddress
 272  *
 273  * Since: 2.22
 274  */
 275 GSocketConnectable *
 276 g_network_address_new (const gchar *hostname,
 277                        guint16      port)
 278 {
 279   return g_object_new (G_TYPE_NETWORK_ADDRESS,
 280                        "hostname", hostname,
 281                        "port", port,
 282                        NULL);
 283 }
 284
 285 /**
 286  * g_network_address_parse:
 287  * @host_and_port: the hostname and optionally a port
 288  * @default_port: the default port if not in @host_and_port
 289  * @error: a pointer to a #GError, or %NULL
 290  *
 291  * Creates a new #GSocketConnectable for connecting to the given
 292  * @hostname and @port. May fail and return %NULL in case
 293  * parsing @host_and_port fails.
 294  *
 295  * @host_and_port may be in any of a number of recognised formats; an IPv6
 296  * address, an IPv4 address, or a domain name (in which case a DNS
 297  * lookup is performed). Quoting with [] is supported for all address
 298  * types. A port override may be specified in the usual way with a
 299  * colon.
 300  *
 301  * If no port is specified in @host_and_port then @default_port will be
 302  * used as the port number to connect to.
 303  *
 304  * In general, @host_and_port is expected to be provided by the user
 305  * (allowing them to give the hostname, and a port overide if necessary)
 306  * and @default_port is expected to be provided by the application.
 307  *
 308  * (The port component of @host_and_port can also be specified as a
 309  * service name rather than as a numeric port, but this functionality
 310  * is deprecated, because it depends on the contents of /etc/services,
 311  * which is generally quite sparse on platforms other than Linux.)
 312  *
 313  * Returns: (transfer full): the new #GNetworkAddress, or %NULL on error
 314  *
 315  * Since: 2.22
 316  */
 317 GSocketConnectable *
 318 g_network_address_parse (const gchar  *host_and_port,
 319                          guint16       default_port,
 320                          GError      **error)
 321 {
 322   GSocketConnectable *connectable;
 323   const gchar *port;
 324   guint16 portnum;
 325   gchar *name;
 326
 327   g_return_val_if_fail (host_and_port != NULL, NULL);
 328
 329   port = NULL;
 330   if (host_and_port[0] == '[')
 331     /* escaped host part (to allow, eg. "[2001:db8::1]:888") */
 332     {
 333       const gchar *end;
 334
 335       end = strchr (host_and_port, ']');
 336       if (end == NULL)
 337         {
 338           g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
 339                        _("Hostname '%s' contains '[' but not ']'"), host_and_port);
 340           return NULL;
 341         }
 342
 343       if (end[1] == '\0')
 344         port = NULL;
 345       else if (end[1] == ':')
 346         port = &end[2];
 347       else
 348         {
 349           g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
 350                        "The ']' character (in hostname '%s') must come at the"
 351                        " end or be immediately followed by ':' and a port",
 352                        host_and_port);
 353           return NULL;
 354         }
 355
 356       name = g_strndup (host_and_port + 1, end - host_and_port - 1);
 357     }
 358
 359   else if ((port = strchr (host_and_port, ':')))
 360     /* string has a ':' in it */
 361     {
 362       /* skip ':' */
 363       port++;
 364
 365       if (strchr (port, ':'))
 366         /* more than one ':' in string */
 367         {
 368           /* this is actually an unescaped IPv6 address */
 369           name = g_strdup (host_and_port);
 370           port = NULL;
 371         }
 372       else
 373         name = g_strndup (host_and_port, port - host_and_port - 1);
 374     }
 375
 376   else
 377     /* plain hostname, no port */
 378     name = g_strdup (host_and_port);
 379
 380   if (port != NULL)
 381     {
 382       if (port[0] == '\0')
 383         {
 384           g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
 385                        "If a ':' character is given, it must be followed by a "
 386                        "port (in hostname '%s').", host_and_port);
 387           g_free (name);
 388           return NULL;
 389         }
 390
 391       else if ('0' <= port[0] && port[0] <= '9')
 392         {
 393           char *end;
 394           long value;
 395
 396           value = strtol (port, &end, 10);
 397           if (*end != '\0' || value < 0 || value > G_MAXUINT16)
 398             {
 399               g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
 400                            "Invalid numeric port '%s' specified in hostname '%s'",
 401                            port, host_and_port);
 402               g_free (name);
 403               return NULL;
 404             }
 405
 406           portnum = value;
 407         }
 408
 409       else
 410         {
 411           struct servent *entry;
 412
 413           entry = getservbyname (port, "tcp");
 414           if (entry == NULL)
 415             {
 416               g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
 417                            "Unknown service '%s' specified in hostname '%s'",
 418                            port, host_and_port);
 419 #ifdef HAVE_ENDSERVENT
 420               endservent ();
 421 #endif
 422               g_free (name);
 423               return NULL;
 424             }
 425
 426           portnum = g_ntohs (entry->s_port);
 427
 428 #ifdef HAVE_ENDSERVENT
 429           endservent ();
 430 #endif
 431         }
 432     }
 433   else
 434     {
 435       /* No port in host_and_port */
 436       portnum = default_port;
 437     }
 438
 439   connectable = g_network_address_new (name, portnum);
 440   g_free (name);
 441
 442   return connectable;
 443 }
 444
 445 /* Allowed characters outside alphanumeric for unreserved. */
 446 #define G_URI_OTHER_UNRESERVED "-._~"
 447
 448 /* This or something equivalent will eventually go into glib/guri.h */
 449 gboolean
 450 _g_uri_parse_authority (const char  *uri,
 451                         char       **host,
 452                         guint16     *port,
 453                         char       **userinfo)
 454 {
 455   char *tmp_str;
 456   const char *start, *p;
 457   char c;
 458
 459   g_return_val_if_fail (uri != NULL, FALSE);
 460
 461   if (host)
 462     *host = NULL;
 463
 464   if (port)
 465     *port = 0;
 466
 467   if (userinfo)
 468     *userinfo = NULL;
 469
 470   /* From RFC 3986 Decodes:
 471    * URI          = scheme ":" hier-part [ "?" query ] [ "#" fragment ]
 472    * hier-part    = "//" authority path-abempty
 473    * path-abempty = *( "/" segment )
 474    * authority    = [ userinfo "@" ] host [ ":" port ]
 475    */
 476
 477   /* Check we have a valid scheme */
 478   tmp_str = g_uri_parse_scheme (uri);
 479
 480   if (tmp_str == NULL)
 481     return FALSE;
 482
 483   g_free (tmp_str);
 484
 485   /* Decode hier-part:
 486    *  hier-part   = "//" authority path-abempty
 487    */
 488   p = uri;
 489   start = strstr (p, "//");
 490
 491   if (start == NULL)
 492     return FALSE;
 493
 494   start += 2;
 495
 496   if (strchr (start, '@') != NULL)
 497     {
 498       /* Decode userinfo:
 499        * userinfo      = *( unreserved / pct-encoded / sub-delims / ":" )
 500        * unreserved    = ALPHA / DIGIT / "-" / "." / "_" / "~"
 501        * pct-encoded   = "%" HEXDIG HEXDIG
 502        */
 503       p = start;
 504       while (1)
 505         {
 506           c = *p++;
 507
 508           if (c == '@')
 509             break;
 510
 511           /* pct-encoded */
 512           if (c == '%')
 513             {
 514               if (!(g_ascii_isxdigit (p[0]) ||
 515                     g_ascii_isxdigit (p[1])))
 516                 return FALSE;
 517
 518               p++;
 519
 520               continue;
 521             }
 522
 523           /* unreserved /  sub-delims / : */
 524           if (!(g_ascii_isalnum (c) ||
 525                 strchr (G_URI_OTHER_UNRESERVED, c) ||
 526                 strchr (G_URI_RESERVED_CHARS_SUBCOMPONENT_DELIMITERS, c) ||
 527                 c == ':'))
 528             return FALSE;
 529         }
 530
 531       if (userinfo)
 532         *userinfo = g_strndup (start, p - start - 1);
 533
 534       start = p;
 535     }
 536   else
 537     {
 538       p = start;
 539     }
 540
 541
 542   /* decode host:
 543    * host          = IP-literal / IPv4address / reg-name
 544    * reg-name      = *( unreserved / pct-encoded / sub-delims )
 545    */
 546
 547   /* If IPv6 or IPvFuture */
 548   if (*p == '[')
 549     {
 550       gboolean has_scope_id = FALSE, has_bad_scope_id = FALSE;
 551
 552       start++;
 553       p++;
 554       while (1)
 555         {
 556           c = *p++;
 557
 558           if (c == ']')
 559             break;
 560
 561           if (c == '%' && !has_scope_id)
 562             {
 563               has_scope_id = TRUE;
 564               if (p[0] != '2' || p[1] != '5')
 565                 has_bad_scope_id = TRUE;
 566               continue;
 567             }
 568
 569           /* unreserved /  sub-delims */
 570           if (!(g_ascii_isalnum (c) ||
 571                 strchr (G_URI_OTHER_UNRESERVED, c) ||
 572                 strchr (G_URI_RESERVED_CHARS_SUBCOMPONENT_DELIMITERS, c) ||
 573                 c == ':' ||
 574                 c == '.'))
 575             goto error;
 576         }
 577
 578       if (host)
 579         {
 580           if (has_bad_scope_id)
 581             *host = g_strndup (start, p - start - 1);
 582           else
 583             *host = g_uri_unescape_segment (start, p - 1, NULL);
 584         }
 585
 586       c = *p++;
 587     }
 588   else
 589     {
 590       while (1)
 591         {
 592           c = *p++;
 593
 594           if (c == ':' ||
 595               c == '/' ||
 596               c == '?' ||
 597               c == '#' ||
 598               c == '\0')
 599             break;
 600
 601           /* pct-encoded */
 602           if (c == '%')
 603             {
 604               if (!(g_ascii_isxdigit (p[0]) ||
 605                     g_ascii_isxdigit (p[1])))
 606                 goto error;
 607
 608               p++;
 609
 610               continue;
 611             }
 612
 613           /* unreserved /  sub-delims */
 614           if (!(g_ascii_isalnum (c) ||
 615                 strchr (G_URI_OTHER_UNRESERVED, c) ||
 616                 strchr (G_URI_RESERVED_CHARS_SUBCOMPONENT_DELIMITERS, c)))
 617             goto error;
 618         }
 619
 620       if (host)
 621         *host = g_uri_unescape_segment (start, p - 1, NULL);
 622     }
 623
 624   if (c == ':')
 625     {
 626       /* Decode port:
 627        *  port          = *DIGIT
 628        */
 629       guint tmp = 0;
 630
 631       while (1)
 632         {
 633           c = *p++;
 634
 635           if (c == '/' ||
 636               c == '?' ||
 637               c == '#' ||
 638               c == '\0')
 639             break;
 640
 641           if (!g_ascii_isdigit (c))
 642             goto error;
 643
 644           tmp = (tmp * 10) + (c - '0');
 645
 646           if (tmp > 65535)
 647             goto error;
 648         }
 649       if (port)
 650         *port = (guint16) tmp;
 651     }
 652
 653   return TRUE;
 654
 655 error:
 656   if (host && *host)
 657     {
 658       g_free (*host);
 659       *host = NULL;
 660     }
 661
 662   if (userinfo && *userinfo)
 663     {
 664       g_free (*userinfo);
 665       *userinfo = NULL;
 666     }
 667
 668   return FALSE;
 669 }
 670
 671 gchar *
 672 _g_uri_from_authority (const gchar *protocol,
 673                        const gchar *host,
 674                        guint        port,
 675                        const gchar *userinfo)
 676 {
 677   GString *uri;
 678
 679   uri = g_string_new (protocol);
 680   g_string_append (uri, "://");
 681
 682   if (userinfo)
 683     {
 684       g_string_append_uri_escaped (uri, userinfo, G_URI_RESERVED_CHARS_ALLOWED_IN_USERINFO, FALSE);
 685       g_string_append_c (uri, '@');
 686     }
 687
 688   if (g_hostname_is_non_ascii (host))
 689     {
 690       gchar *ace_encoded = g_hostname_to_ascii (host);
 691
 692       if (!ace_encoded)
 693         {
 694           g_string_free (uri, TRUE);
 695           return NULL;
 696         }
 697       g_string_append (uri, ace_encoded);
 698       g_free (ace_encoded);
 699     }
 700   else if (strchr (host, ':'))
 701     g_string_append_printf (uri, "[%s]", host);
 702   else
 703     g_string_append (uri, host);
 704
 705   if (port != 0)
 706     g_string_append_printf (uri, ":%u", port);
 707
 708   return g_string_free (uri, FALSE);
 709 }
 710
 711 /**
 712  * g_network_address_parse_uri:
 713  * @uri: the hostname and optionally a port
 714  * @default_port: The default port if none is found in the URI
 715  * @error: a pointer to a #GError, or %NULL
 716  *
 717  * Creates a new #GSocketConnectable for connecting to the given
 718  * @uri. May fail and return %NULL in case parsing @uri fails.
 719  *
 720  * Using this rather than g_network_address_new() or
 721  * g_network_address_parse() allows #GSocketClient to determine
 722  * when to use application-specific proxy protocols.
 723  *
 724  * Returns: (transfer full): the new #GNetworkAddress, or %NULL on error
 725  *
 726  * Since: 2.26
 727  */
 728 GSocketConnectable *
 729 g_network_address_parse_uri (const gchar  *uri,
 730                              guint16       default_port,
 731                              GError      **error)
 732 {
 733   GSocketConnectable *conn;
 734   gchar *scheme;
 735   gchar *hostname;
 736   guint16 port;
 737
 738   if (!_g_uri_parse_authority (uri, &hostname, &port, NULL))
 739     {
 740       g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
 741                    "Invalid URI '%s'",
 742                    uri);
 743       return NULL;
 744     }
 745
 746   if (port == 0)
 747     port = default_port;
 748
 749   scheme = g_uri_parse_scheme (uri);
 750
 751   conn = g_object_new (G_TYPE_NETWORK_ADDRESS,
 752                        "hostname", hostname,
 753                        "port", port,
 754                        "scheme", scheme,
 755                        NULL);
 756
 757   g_free (scheme);
 758   g_free (hostname);
 759
 760   return conn;
 761 }
 762
 763 /**
 764  * g_network_address_get_hostname:
 765  * @addr: a #GNetworkAddress
 766  *
 767  * Gets @addr's hostname. This might be either UTF-8 or ASCII-encoded,
 768  * depending on what @addr was created with.
 769  *
 770  * Returns: @addr's hostname
 771  *
 772  * Since: 2.22
 773  */
 774 const gchar *
 775 g_network_address_get_hostname (GNetworkAddress *addr)
 776 {
 777   g_return_val_if_fail (G_IS_NETWORK_ADDRESS (addr), NULL);
 778
 779   return addr->priv->hostname;
 780 }
 781
 782 /**
 783  * g_network_address_get_port:
 784  * @addr: a #GNetworkAddress
 785  *
 786  * Gets @addr's port number
 787  *
 788  * Returns: @addr's port (which may be 0)
 789  *
 790  * Since: 2.22
 791  */
 792 guint16
 793 g_network_address_get_port (GNetworkAddress *addr)
 794 {
 795   g_return_val_if_fail (G_IS_NETWORK_ADDRESS (addr), 0);
 796
 797   return addr->priv->port;
 798 }
 799
 800 /**
 801  * g_network_address_get_scheme:
 802  * @addr: a #GNetworkAddress
 803  *
 804  * Gets @addr's scheme
 805  *
 806  * Returns: @addr's scheme (%NULL if not built from URI)
 807  *
 808  * Since: 2.26
 809  */
 810 const gchar *
 811 g_network_address_get_scheme (GNetworkAddress *addr)
 812 {
 813   g_return_val_if_fail (G_IS_NETWORK_ADDRESS (addr), NULL);
 814
 815   return addr->priv->scheme;
 816 }
 817
 818 #define G_TYPE_NETWORK_ADDRESS_ADDRESS_ENUMERATOR (_g_network_address_address_enumerator_get_type ())
 819 #define G_NETWORK_ADDRESS_ADDRESS_ENUMERATOR(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), G_TYPE_NETWORK_ADDRESS_ADDRESS_ENUMERATOR, GNetworkAddressAddressEnumerator))
 820
 821 typedef struct {
 822   GSocketAddressEnumerator parent_instance;
 823
 824   GNetworkAddress *addr;
 825   GList *addresses;
 826   GList *next;
 827 } GNetworkAddressAddressEnumerator;
 828
 829 typedef struct {
 830   GSocketAddressEnumeratorClass parent_class;
 831
 832 } GNetworkAddressAddressEnumeratorClass;
 833
 834 static GType _g_network_address_address_enumerator_get_type (void);
 835 G_DEFINE_TYPE (GNetworkAddressAddressEnumerator, _g_network_address_address_enumerator, G_TYPE_SOCKET_ADDRESS_ENUMERATOR)
 836
 837 static void
 838 g_network_address_address_enumerator_finalize (GObject *object)
 839 {
 840   GNetworkAddressAddressEnumerator *addr_enum =
 841     G_NETWORK_ADDRESS_ADDRESS_ENUMERATOR (object);
 842
 843   g_object_unref (addr_enum->addr);
 844
 845   G_OBJECT_CLASS (_g_network_address_address_enumerator_parent_class)->finalize (object);
 846 }
 847
 848 static GSocketAddress *
 849 g_network_address_address_enumerator_next (GSocketAddressEnumerator  *enumerator,
 850                                            GCancellable              *cancellable,
 851                                            GError                   **error)
 852 {
 853   GNetworkAddressAddressEnumerator *addr_enum =
 854     G_NETWORK_ADDRESS_ADDRESS_ENUMERATOR (enumerator);
 855   GSocketAddress *sockaddr;
 856
 857   if (addr_enum->addresses == NULL)
 858     {
 859       GNetworkAddress *addr = addr_enum->addr;
 860       GResolver *resolver = g_resolver_get_default ();
 861       gint64 serial = g_resolver_get_serial (resolver);
 862
 863       if (addr->priv->resolver_serial != 0 &&
 864           addr->priv->resolver_serial != serial)
 865         {
 866           /* Resolver has reloaded, discard cached addresses */
 867           g_list_free_full (addr->priv->sockaddrs, g_object_unref);
 868           addr->priv->sockaddrs = NULL;
 869         }
 870
 871       if (!addr->priv->sockaddrs)
 872         g_network_address_parse_sockaddr (addr);
 873       if (!addr->priv->sockaddrs)
 874         {
 875           GList *addresses;
 876
 877           addresses = g_resolver_lookup_by_name (resolver,
 878                                                  addr->priv->hostname,
 879                                                  cancellable, error);
 880           if (!addresses)
 881             {
 882               g_object_unref (resolver);
 883               return NULL;
 884             }
 885
 886           g_network_address_set_addresses (addr, addresses, serial);
 887         }
 888
 889       addr_enum->addresses = addr->priv->sockaddrs;
 890       addr_enum->next = addr_enum->addresses;
 891       g_object_unref (resolver);
 892     }
 893
 894   if (addr_enum->next == NULL)
 895     return NULL;
 896
 897   sockaddr = addr_enum->next->data;
 898   addr_enum->next = addr_enum->next->next;
 899   return g_object_ref (sockaddr);
 900 }
 901
 902 static void
 903 have_addresses (GNetworkAddressAddressEnumerator *addr_enum,
 904                 GTask *task, GError *error)
 905 {
 906   GSocketAddress *sockaddr;
 907
 908   addr_enum->addresses = addr_enum->addr->priv->sockaddrs;
 909   addr_enum->next = addr_enum->addresses;
 910
 911   if (addr_enum->next)
 912     {
 913       sockaddr = g_object_ref (addr_enum->next->data);
 914       addr_enum->next = addr_enum->next->next;
 915     }
 916   else
 917     sockaddr = NULL;
 918
 919   if (error)
 920     g_task_return_error (task, error);
 921   else
 922     g_task_return_pointer (task, sockaddr, g_object_unref);
 923   g_object_unref (task);
 924 }
 925
 926 static void
 927 got_addresses (GObject      *source_object,
 928                GAsyncResult *result,
 929                gpointer      user_data)
 930 {
 931   GTask *task = user_data;
 932   GNetworkAddressAddressEnumerator *addr_enum = g_task_get_source_object (task);
 933   GResolver *resolver = G_RESOLVER (source_object);
 934   GList *addresses;
 935   GError *error = NULL;
 936
 937   if (!addr_enum->addr->priv->sockaddrs)
 938     {
 939       addresses = g_resolver_lookup_by_name_finish (resolver, result, &error);
 940
 941       if (!error)
 942         {
 943           g_network_address_set_addresses (addr_enum->addr, addresses,
 944                                            g_resolver_get_serial (resolver));
 945         }
 946     }
 947   have_addresses (addr_enum, task, error);
 948 }
 949
 950 static void
 951 g_network_address_address_enumerator_next_async (GSocketAddressEnumerator  *enumerator,
 952                                                  GCancellable              *cancellable,
 953                                                  GAsyncReadyCallback        callback,
 954                                                  gpointer                   user_data)
 955 {
 956   GNetworkAddressAddressEnumerator *addr_enum =
 957     G_NETWORK_ADDRESS_ADDRESS_ENUMERATOR (enumerator);
 958   GSocketAddress *sockaddr;
 959   GTask *task;
 960
 961   task = g_task_new (addr_enum, cancellable, callback, user_data);
 962
 963   if (addr_enum->addresses == NULL)
 964     {
 965       GNetworkAddress *addr = addr_enum->addr;
 966       GResolver *resolver = g_resolver_get_default ();
 967       gint64 serial = g_resolver_get_serial (resolver);
 968
 969       if (addr->priv->resolver_serial != 0 &&
 970           addr->priv->resolver_serial != serial)
 971         {
 972           /* Resolver has reloaded, discard cached addresses */
 973           g_list_free_full (addr->priv->sockaddrs, g_object_unref);
 974           addr->priv->sockaddrs = NULL;
 975         }
 976
 977       if (!addr->priv->sockaddrs)
 978         {
 979           if (g_network_address_parse_sockaddr (addr))
 980             have_addresses (addr_enum, task, NULL);
 981           else
 982             {
 983               g_resolver_lookup_by_name_async (resolver,
 984                                                addr->priv->hostname,
 985                                                cancellable,
 986                                                got_addresses, task);
 987             }
 988           g_object_unref (resolver);
 989           return;
 990         }
 991
 992       addr_enum->addresses = addr->priv->sockaddrs;
 993       addr_enum->next = addr_enum->addresses;
 994       g_object_unref (resolver);
 995     }
 996
 997   if (addr_enum->next)
 998     {
 999       sockaddr = g_object_ref (addr_enum->next->data);
1000       addr_enum->next = addr_enum->next->next;
1001     }
1002   else
1003     sockaddr = NULL;
1004
1005   g_task_return_pointer (task, sockaddr, g_object_unref);
1006   g_object_unref (task);
1007 }
1008
1009 static GSocketAddress *
1010 g_network_address_address_enumerator_next_finish (GSocketAddressEnumerator  *enumerator,
1011                                                   GAsyncResult              *result,
1012                                                   GError                   **error)
1013 {
1014   g_return_val_if_fail (g_task_is_valid (result, enumerator), NULL);
1015
1016   return g_task_propagate_pointer (G_TASK (result), error);
1017 }
1018
1019 static void
1020 _g_network_address_address_enumerator_init (GNetworkAddressAddressEnumerator *enumerator)
1021 {
1022 }
1023
1024 static void
1025 _g_network_address_address_enumerator_class_init (GNetworkAddressAddressEnumeratorClass *addrenum_class)
1026 {
1027   GObjectClass *object_class = G_OBJECT_CLASS (addrenum_class);
1028   GSocketAddressEnumeratorClass *enumerator_class =
1029     G_SOCKET_ADDRESS_ENUMERATOR_CLASS (addrenum_class);
1030
1031   enumerator_class->next = g_network_address_address_enumerator_next;
1032   enumerator_class->next_async = g_network_address_address_enumerator_next_async;
1033   enumerator_class->next_finish = g_network_address_address_enumerator_next_finish;
1034   object_class->finalize = g_network_address_address_enumerator_finalize;
1035 }
1036
1037 static GSocketAddressEnumerator *
1038 g_network_address_connectable_enumerate (GSocketConnectable *connectable)
1039 {
1040   GNetworkAddressAddressEnumerator *addr_enum;
1041
1042   addr_enum = g_object_new (G_TYPE_NETWORK_ADDRESS_ADDRESS_ENUMERATOR, NULL);
1043   addr_enum->addr = g_object_ref (connectable);
1044
1045   return (GSocketAddressEnumerator *)addr_enum;
1046 }
1047
1048 static GSocketAddressEnumerator *
1049 g_network_address_connectable_proxy_enumerate (GSocketConnectable *connectable)
1050 {
1051   GNetworkAddress *self = G_NETWORK_ADDRESS (connectable);
1052   GSocketAddressEnumerator *proxy_enum;
1053   gchar *uri;
1054
1055   uri = _g_uri_from_authority (self->priv->scheme ? self->priv->scheme : "none",
1056                                self->priv->hostname,
1057                                self->priv->port,
1058                                NULL);
1059
1060   proxy_enum = g_object_new (G_TYPE_PROXY_ADDRESS_ENUMERATOR,
1061                              "connectable", connectable,
1062                              "uri", uri,
1063                              NULL);
1064
1065   g_free (uri);
1066
1067   return proxy_enum;
1068 }