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54cc43630d
As it turns out, we have examples of internal functions called type_name_get_private() in the wild (especially among older libraries), so we need to use a name for the per-instance private data getter function that hopefully won't conflict with anything.
878 lines
28 KiB
C
878 lines
28 KiB
C
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
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/* GIO - GLib Input, Output and Streaming Library
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*
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* Copyright (C) 2008 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General
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* Public License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include "config.h"
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#include <glib.h>
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#include "glibintl.h"
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#include "gresolver.h"
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#include "gnetworkingprivate.h"
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#include "gasyncresult.h"
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#include "ginetaddress.h"
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#include "gsimpleasyncresult.h"
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#include "gtask.h"
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#include "gsrvtarget.h"
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#include "gthreadedresolver.h"
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#ifdef G_OS_UNIX
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#include <sys/stat.h>
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#endif
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#include <stdlib.h>
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/**
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* SECTION:gresolver
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* @short_description: Asynchronous and cancellable DNS resolver
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* @include: gio/gio.h
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*
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* #GResolver provides cancellable synchronous and asynchronous DNS
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* resolution, for hostnames (g_resolver_lookup_by_address(),
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* g_resolver_lookup_by_name() and their async variants) and SRV
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* (service) records (g_resolver_lookup_service()).
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*
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* #GNetworkAddress and #GNetworkService provide wrappers around
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* #GResolver functionality that also implement #GSocketConnectable,
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* making it easy to connect to a remote host/service.
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*/
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enum {
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RELOAD,
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LAST_SIGNAL
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};
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static guint signals[LAST_SIGNAL] = { 0 };
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struct _GResolverPrivate {
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#ifdef G_OS_UNIX
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time_t resolv_conf_timestamp;
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#else
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int dummy;
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#endif
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};
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/**
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* GResolver:
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*
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* The object that handles DNS resolution. Use g_resolver_get_default()
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* to get the default resolver.
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*/
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G_DEFINE_TYPE_WITH_CODE (GResolver, g_resolver, G_TYPE_OBJECT,
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G_ADD_PRIVATE (GResolver)
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g_networking_init ();)
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static GList *
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srv_records_to_targets (GList *records)
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{
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const gchar *hostname;
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guint16 port, priority, weight;
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GSrvTarget *target;
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GList *l;
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for (l = records; l != NULL; l = g_list_next (l))
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{
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g_variant_get (l->data, "(qqq&s)", &priority, &weight, &port, &hostname);
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target = g_srv_target_new (hostname, port, priority, weight);
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g_variant_unref (l->data);
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l->data = target;
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}
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return g_srv_target_list_sort (records);
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}
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static GList *
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g_resolver_real_lookup_service (GResolver *resolver,
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const gchar *rrname,
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GCancellable *cancellable,
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GError **error)
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{
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GList *records;
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records = G_RESOLVER_GET_CLASS (resolver)->lookup_records (resolver,
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rrname,
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G_RESOLVER_RECORD_SRV,
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cancellable,
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error);
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return srv_records_to_targets (records);
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}
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static void
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g_resolver_real_lookup_service_async (GResolver *resolver,
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const gchar *rrname,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data)
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{
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G_RESOLVER_GET_CLASS (resolver)->lookup_records_async (resolver,
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rrname,
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G_RESOLVER_RECORD_SRV,
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cancellable,
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callback,
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user_data);
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}
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static GList *
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g_resolver_real_lookup_service_finish (GResolver *resolver,
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GAsyncResult *result,
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GError **error)
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{
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GList *records;
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records = G_RESOLVER_GET_CLASS (resolver)->lookup_records_finish (resolver,
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result,
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error);
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return srv_records_to_targets (records);
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}
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static void
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g_resolver_class_init (GResolverClass *resolver_class)
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{
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/* Automatically pass these over to the lookup_records methods */
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resolver_class->lookup_service = g_resolver_real_lookup_service;
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resolver_class->lookup_service_async = g_resolver_real_lookup_service_async;
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resolver_class->lookup_service_finish = g_resolver_real_lookup_service_finish;
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/**
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* GResolver::reload:
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* @resolver: a #GResolver
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*
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* Emitted when the resolver notices that the system resolver
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* configuration has changed.
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**/
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signals[RELOAD] =
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g_signal_new (I_("reload"),
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G_TYPE_RESOLVER,
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G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GResolverClass, reload),
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NULL, NULL,
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g_cclosure_marshal_VOID__VOID,
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G_TYPE_NONE, 0);
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}
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static void
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g_resolver_init (GResolver *resolver)
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{
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#ifdef G_OS_UNIX
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struct stat st;
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#endif
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resolver->priv = g_resolver_get_instance_private (resolver);
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#ifdef G_OS_UNIX
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if (stat (_PATH_RESCONF, &st) == 0)
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resolver->priv->resolv_conf_timestamp = st.st_mtime;
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#endif
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}
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static GResolver *default_resolver;
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/**
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* g_resolver_get_default:
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*
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* Gets the default #GResolver. You should unref it when you are done
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* with it. #GResolver may use its reference count as a hint about how
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* many threads it should allocate for concurrent DNS resolutions.
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*
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* Return value: (transfer full): the default #GResolver.
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*
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* Since: 2.22
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*/
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GResolver *
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g_resolver_get_default (void)
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{
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if (!default_resolver)
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default_resolver = g_object_new (G_TYPE_THREADED_RESOLVER, NULL);
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return g_object_ref (default_resolver);
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}
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/**
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* g_resolver_set_default:
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* @resolver: the new default #GResolver
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*
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* Sets @resolver to be the application's default resolver (reffing
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* @resolver, and unreffing the previous default resolver, if any).
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* Future calls to g_resolver_get_default() will return this resolver.
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*
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* This can be used if an application wants to perform any sort of DNS
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* caching or "pinning"; it can implement its own #GResolver that
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* calls the original default resolver for DNS operations, and
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* implements its own cache policies on top of that, and then set
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* itself as the default resolver for all later code to use.
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*
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* Since: 2.22
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*/
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void
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g_resolver_set_default (GResolver *resolver)
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{
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if (default_resolver)
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g_object_unref (default_resolver);
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default_resolver = g_object_ref (resolver);
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}
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/* Bionic has res_init() but it's not in any header */
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#ifdef __BIONIC__
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int res_init (void);
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#endif
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static void
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g_resolver_maybe_reload (GResolver *resolver)
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{
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#ifdef G_OS_UNIX
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struct stat st;
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if (stat (_PATH_RESCONF, &st) == 0)
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{
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if (st.st_mtime != resolver->priv->resolv_conf_timestamp)
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{
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resolver->priv->resolv_conf_timestamp = st.st_mtime;
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#ifdef HAVE_RES_INIT
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res_init ();
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#endif
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g_signal_emit (resolver, signals[RELOAD], 0);
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}
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}
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#endif
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}
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/* filter out duplicates, cf. https://bugzilla.gnome.org/show_bug.cgi?id=631379 */
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static void
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remove_duplicates (GList *addrs)
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{
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GList *l;
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GList *ll;
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GList *lll;
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/* TODO: if this is too slow (it's O(n^2) but n is typically really
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* small), we can do something more clever but note that we must not
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* change the order of elements...
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*/
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for (l = addrs; l != NULL; l = l->next)
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{
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GInetAddress *address = G_INET_ADDRESS (l->data);
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for (ll = l->next; ll != NULL; ll = lll)
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{
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GInetAddress *other_address = G_INET_ADDRESS (ll->data);
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lll = ll->next;
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if (g_inet_address_equal (address, other_address))
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{
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g_object_unref (other_address);
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/* we never return the first element */
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g_warn_if_fail (g_list_delete_link (addrs, ll) == addrs);
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}
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}
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}
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}
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/**
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* g_resolver_lookup_by_name:
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* @resolver: a #GResolver
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* @hostname: the hostname to look up
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* @cancellable: (allow-none): a #GCancellable, or %NULL
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* @error: return location for a #GError, or %NULL
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*
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* Synchronously resolves @hostname to determine its associated IP
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* address(es). @hostname may be an ASCII-only or UTF-8 hostname, or
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* the textual form of an IP address (in which case this just becomes
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* a wrapper around g_inet_address_new_from_string()).
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*
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* On success, g_resolver_lookup_by_name() will return a #GList of
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* #GInetAddress, sorted in order of preference and guaranteed to not
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* contain duplicates. That is, if using the result to connect to
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* @hostname, you should attempt to connect to the first address
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* first, then the second if the first fails, etc. If you are using
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* the result to listen on a socket, it is appropriate to add each
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* result using e.g. g_socket_listener_add_address().
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*
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* If the DNS resolution fails, @error (if non-%NULL) will be set to a
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* value from #GResolverError.
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*
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* If @cancellable is non-%NULL, it can be used to cancel the
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* operation, in which case @error (if non-%NULL) will be set to
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* %G_IO_ERROR_CANCELLED.
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*
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* If you are planning to connect to a socket on the resolved IP
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* address, it may be easier to create a #GNetworkAddress and use its
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* #GSocketConnectable interface.
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*
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* Return value: (element-type GInetAddress) (transfer full): a #GList
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* of #GInetAddress, or %NULL on error. You
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* must unref each of the addresses and free the list when you are
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* done with it. (You can use g_resolver_free_addresses() to do this.)
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*
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* Since: 2.22
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*/
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GList *
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g_resolver_lookup_by_name (GResolver *resolver,
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const gchar *hostname,
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GCancellable *cancellable,
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GError **error)
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{
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GInetAddress *addr;
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GList *addrs;
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gchar *ascii_hostname = NULL;
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g_return_val_if_fail (G_IS_RESOLVER (resolver), NULL);
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g_return_val_if_fail (hostname != NULL, NULL);
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/* Check if @hostname is just an IP address */
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addr = g_inet_address_new_from_string (hostname);
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if (addr)
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return g_list_append (NULL, addr);
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if (g_hostname_is_non_ascii (hostname))
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hostname = ascii_hostname = g_hostname_to_ascii (hostname);
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g_resolver_maybe_reload (resolver);
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addrs = G_RESOLVER_GET_CLASS (resolver)->
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lookup_by_name (resolver, hostname, cancellable, error);
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remove_duplicates (addrs);
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g_free (ascii_hostname);
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return addrs;
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}
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/**
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* g_resolver_lookup_by_name_async:
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* @resolver: a #GResolver
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* @hostname: the hostname to look up the address of
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* @cancellable: (allow-none): a #GCancellable, or %NULL
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* @callback: (scope async): callback to call after resolution completes
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* @user_data: (closure): data for @callback
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*
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* Begins asynchronously resolving @hostname to determine its
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* associated IP address(es), and eventually calls @callback, which
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* must call g_resolver_lookup_by_name_finish() to get the result.
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* See g_resolver_lookup_by_name() for more details.
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*
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* Since: 2.22
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*/
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void
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g_resolver_lookup_by_name_async (GResolver *resolver,
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const gchar *hostname,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data)
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{
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GInetAddress *addr;
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gchar *ascii_hostname = NULL;
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g_return_if_fail (G_IS_RESOLVER (resolver));
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g_return_if_fail (hostname != NULL);
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/* Check if @hostname is just an IP address */
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addr = g_inet_address_new_from_string (hostname);
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if (addr)
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{
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GTask *task;
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task = g_task_new (resolver, cancellable, callback, user_data);
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g_task_set_source_tag (task, g_resolver_lookup_by_name_async);
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g_task_return_pointer (task, g_list_append (NULL, addr),
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(GDestroyNotify) g_resolver_free_addresses);
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g_object_unref (task);
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return;
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}
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if (g_hostname_is_non_ascii (hostname))
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hostname = ascii_hostname = g_hostname_to_ascii (hostname);
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g_resolver_maybe_reload (resolver);
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G_RESOLVER_GET_CLASS (resolver)->
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lookup_by_name_async (resolver, hostname, cancellable, callback, user_data);
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g_free (ascii_hostname);
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}
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/**
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* g_resolver_lookup_by_name_finish:
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* @resolver: a #GResolver
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* @result: the result passed to your #GAsyncReadyCallback
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* @error: return location for a #GError, or %NULL
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*
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* Retrieves the result of a call to
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* g_resolver_lookup_by_name_async().
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*
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* If the DNS resolution failed, @error (if non-%NULL) will be set to
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* a value from #GResolverError. If the operation was cancelled,
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* @error will be set to %G_IO_ERROR_CANCELLED.
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*
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* Return value: (element-type GInetAddress) (transfer full): a #GList
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* of #GInetAddress, or %NULL on error. See g_resolver_lookup_by_name()
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* for more details.
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*
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* Since: 2.22
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*/
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GList *
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g_resolver_lookup_by_name_finish (GResolver *resolver,
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GAsyncResult *result,
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GError **error)
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{
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GList *addrs;
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g_return_val_if_fail (G_IS_RESOLVER (resolver), NULL);
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if (g_async_result_legacy_propagate_error (result, error))
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return NULL;
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else if (g_async_result_is_tagged (result, g_resolver_lookup_by_name_async))
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{
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/* Handle the stringified-IP-addr case */
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return g_task_propagate_pointer (G_TASK (result), error);
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}
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addrs = G_RESOLVER_GET_CLASS (resolver)->
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lookup_by_name_finish (resolver, result, error);
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remove_duplicates (addrs);
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return addrs;
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}
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/**
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* g_resolver_free_addresses: (skip)
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* @addresses: a #GList of #GInetAddress
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*
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* Frees @addresses (which should be the return value from
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* g_resolver_lookup_by_name() or g_resolver_lookup_by_name_finish()).
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* (This is a convenience method; you can also simply free the results
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* by hand.)
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*
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* Since: 2.22
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*/
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void
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g_resolver_free_addresses (GList *addresses)
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{
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GList *a;
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for (a = addresses; a; a = a->next)
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g_object_unref (a->data);
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g_list_free (addresses);
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}
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/**
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* g_resolver_lookup_by_address:
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* @resolver: a #GResolver
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* @address: the address to reverse-resolve
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* @cancellable: (allow-none): a #GCancellable, or %NULL
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* @error: return location for a #GError, or %NULL
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*
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* Synchronously reverse-resolves @address to determine its
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* associated hostname.
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*
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* If the DNS resolution fails, @error (if non-%NULL) will be set to
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* a value from #GResolverError.
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*
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* If @cancellable is non-%NULL, it can be used to cancel the
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* operation, in which case @error (if non-%NULL) will be set to
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* %G_IO_ERROR_CANCELLED.
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*
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* Return value: a hostname (either ASCII-only, or in ASCII-encoded
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* form), or %NULL on error.
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*
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* Since: 2.22
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*/
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gchar *
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g_resolver_lookup_by_address (GResolver *resolver,
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GInetAddress *address,
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GCancellable *cancellable,
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GError **error)
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{
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g_return_val_if_fail (G_IS_RESOLVER (resolver), NULL);
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g_return_val_if_fail (G_IS_INET_ADDRESS (address), NULL);
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g_resolver_maybe_reload (resolver);
|
|
return G_RESOLVER_GET_CLASS (resolver)->
|
|
lookup_by_address (resolver, address, cancellable, error);
|
|
}
|
|
|
|
/**
|
|
* g_resolver_lookup_by_address_async:
|
|
* @resolver: a #GResolver
|
|
* @address: the address to reverse-resolve
|
|
* @cancellable: (allow-none): a #GCancellable, or %NULL
|
|
* @callback: (scope async): callback to call after resolution completes
|
|
* @user_data: (closure): data for @callback
|
|
*
|
|
* Begins asynchronously reverse-resolving @address to determine its
|
|
* associated hostname, and eventually calls @callback, which must
|
|
* call g_resolver_lookup_by_address_finish() to get the final result.
|
|
*
|
|
* Since: 2.22
|
|
*/
|
|
void
|
|
g_resolver_lookup_by_address_async (GResolver *resolver,
|
|
GInetAddress *address,
|
|
GCancellable *cancellable,
|
|
GAsyncReadyCallback callback,
|
|
gpointer user_data)
|
|
{
|
|
g_return_if_fail (G_IS_RESOLVER (resolver));
|
|
g_return_if_fail (G_IS_INET_ADDRESS (address));
|
|
|
|
g_resolver_maybe_reload (resolver);
|
|
G_RESOLVER_GET_CLASS (resolver)->
|
|
lookup_by_address_async (resolver, address, cancellable, callback, user_data);
|
|
}
|
|
|
|
/**
|
|
* g_resolver_lookup_by_address_finish:
|
|
* @resolver: a #GResolver
|
|
* @result: the result passed to your #GAsyncReadyCallback
|
|
* @error: return location for a #GError, or %NULL
|
|
*
|
|
* Retrieves the result of a previous call to
|
|
* g_resolver_lookup_by_address_async().
|
|
*
|
|
* If the DNS resolution failed, @error (if non-%NULL) will be set to
|
|
* a value from #GResolverError. If the operation was cancelled,
|
|
* @error will be set to %G_IO_ERROR_CANCELLED.
|
|
*
|
|
* Return value: a hostname (either ASCII-only, or in ASCII-encoded
|
|
* form), or %NULL on error.
|
|
*
|
|
* Since: 2.22
|
|
*/
|
|
gchar *
|
|
g_resolver_lookup_by_address_finish (GResolver *resolver,
|
|
GAsyncResult *result,
|
|
GError **error)
|
|
{
|
|
g_return_val_if_fail (G_IS_RESOLVER (resolver), NULL);
|
|
|
|
if (g_async_result_legacy_propagate_error (result, error))
|
|
return NULL;
|
|
|
|
return G_RESOLVER_GET_CLASS (resolver)->
|
|
lookup_by_address_finish (resolver, result, error);
|
|
}
|
|
|
|
static gchar *
|
|
g_resolver_get_service_rrname (const char *service,
|
|
const char *protocol,
|
|
const char *domain)
|
|
{
|
|
gchar *rrname, *ascii_domain = NULL;
|
|
|
|
if (g_hostname_is_non_ascii (domain))
|
|
domain = ascii_domain = g_hostname_to_ascii (domain);
|
|
|
|
rrname = g_strdup_printf ("_%s._%s.%s", service, protocol, domain);
|
|
|
|
g_free (ascii_domain);
|
|
return rrname;
|
|
}
|
|
|
|
/**
|
|
* g_resolver_lookup_service:
|
|
* @resolver: a #GResolver
|
|
* @service: the service type to look up (eg, "ldap")
|
|
* @protocol: the networking protocol to use for @service (eg, "tcp")
|
|
* @domain: the DNS domain to look up the service in
|
|
* @cancellable: (allow-none): a #GCancellable, or %NULL
|
|
* @error: return location for a #GError, or %NULL
|
|
*
|
|
* Synchronously performs a DNS SRV lookup for the given @service and
|
|
* @protocol in the given @domain and returns an array of #GSrvTarget.
|
|
* @domain may be an ASCII-only or UTF-8 hostname. Note also that the
|
|
* @service and @protocol arguments <emphasis>do not</emphasis>
|
|
* include the leading underscore that appears in the actual DNS
|
|
* entry.
|
|
*
|
|
* On success, g_resolver_lookup_service() will return a #GList of
|
|
* #GSrvTarget, sorted in order of preference. (That is, you should
|
|
* attempt to connect to the first target first, then the second if
|
|
* the first fails, etc.)
|
|
*
|
|
* If the DNS resolution fails, @error (if non-%NULL) will be set to
|
|
* a value from #GResolverError.
|
|
*
|
|
* If @cancellable is non-%NULL, it can be used to cancel the
|
|
* operation, in which case @error (if non-%NULL) will be set to
|
|
* %G_IO_ERROR_CANCELLED.
|
|
*
|
|
* If you are planning to connect to the service, it is usually easier
|
|
* to create a #GNetworkService and use its #GSocketConnectable
|
|
* interface.
|
|
*
|
|
* Return value: (element-type GSrvTarget) (transfer full): a #GList of #GSrvTarget,
|
|
* or %NULL on error. You must free each of the targets and the list when you are
|
|
* done with it. (You can use g_resolver_free_targets() to do this.)
|
|
*
|
|
* Since: 2.22
|
|
*/
|
|
GList *
|
|
g_resolver_lookup_service (GResolver *resolver,
|
|
const gchar *service,
|
|
const gchar *protocol,
|
|
const gchar *domain,
|
|
GCancellable *cancellable,
|
|
GError **error)
|
|
{
|
|
GList *targets;
|
|
gchar *rrname;
|
|
|
|
g_return_val_if_fail (G_IS_RESOLVER (resolver), NULL);
|
|
g_return_val_if_fail (service != NULL, NULL);
|
|
g_return_val_if_fail (protocol != NULL, NULL);
|
|
g_return_val_if_fail (domain != NULL, NULL);
|
|
|
|
rrname = g_resolver_get_service_rrname (service, protocol, domain);
|
|
|
|
g_resolver_maybe_reload (resolver);
|
|
targets = G_RESOLVER_GET_CLASS (resolver)->
|
|
lookup_service (resolver, rrname, cancellable, error);
|
|
|
|
g_free (rrname);
|
|
return targets;
|
|
}
|
|
|
|
/**
|
|
* g_resolver_lookup_service_async:
|
|
* @resolver: a #GResolver
|
|
* @service: the service type to look up (eg, "ldap")
|
|
* @protocol: the networking protocol to use for @service (eg, "tcp")
|
|
* @domain: the DNS domain to look up the service in
|
|
* @cancellable: (allow-none): a #GCancellable, or %NULL
|
|
* @callback: (scope async): callback to call after resolution completes
|
|
* @user_data: (closure): data for @callback
|
|
*
|
|
* Begins asynchronously performing a DNS SRV lookup for the given
|
|
* @service and @protocol in the given @domain, and eventually calls
|
|
* @callback, which must call g_resolver_lookup_service_finish() to
|
|
* get the final result. See g_resolver_lookup_service() for more
|
|
* details.
|
|
*
|
|
* Since: 2.22
|
|
*/
|
|
void
|
|
g_resolver_lookup_service_async (GResolver *resolver,
|
|
const gchar *service,
|
|
const gchar *protocol,
|
|
const gchar *domain,
|
|
GCancellable *cancellable,
|
|
GAsyncReadyCallback callback,
|
|
gpointer user_data)
|
|
{
|
|
gchar *rrname;
|
|
|
|
g_return_if_fail (G_IS_RESOLVER (resolver));
|
|
g_return_if_fail (service != NULL);
|
|
g_return_if_fail (protocol != NULL);
|
|
g_return_if_fail (domain != NULL);
|
|
|
|
rrname = g_resolver_get_service_rrname (service, protocol, domain);
|
|
|
|
g_resolver_maybe_reload (resolver);
|
|
G_RESOLVER_GET_CLASS (resolver)->
|
|
lookup_service_async (resolver, rrname, cancellable, callback, user_data);
|
|
|
|
g_free (rrname);
|
|
}
|
|
|
|
/**
|
|
* g_resolver_lookup_service_finish:
|
|
* @resolver: a #GResolver
|
|
* @result: the result passed to your #GAsyncReadyCallback
|
|
* @error: return location for a #GError, or %NULL
|
|
*
|
|
* Retrieves the result of a previous call to
|
|
* g_resolver_lookup_service_async().
|
|
*
|
|
* If the DNS resolution failed, @error (if non-%NULL) will be set to
|
|
* a value from #GResolverError. If the operation was cancelled,
|
|
* @error will be set to %G_IO_ERROR_CANCELLED.
|
|
*
|
|
* Return value: (element-type GSrvTarget) (transfer full): a #GList of #GSrvTarget,
|
|
* or %NULL on error. See g_resolver_lookup_service() for more details.
|
|
*
|
|
* Since: 2.22
|
|
*/
|
|
GList *
|
|
g_resolver_lookup_service_finish (GResolver *resolver,
|
|
GAsyncResult *result,
|
|
GError **error)
|
|
{
|
|
g_return_val_if_fail (G_IS_RESOLVER (resolver), NULL);
|
|
|
|
if (g_async_result_legacy_propagate_error (result, error))
|
|
return NULL;
|
|
|
|
return G_RESOLVER_GET_CLASS (resolver)->
|
|
lookup_service_finish (resolver, result, error);
|
|
}
|
|
|
|
/**
|
|
* g_resolver_free_targets: (skip)
|
|
* @targets: a #GList of #GSrvTarget
|
|
*
|
|
* Frees @targets (which should be the return value from
|
|
* g_resolver_lookup_service() or g_resolver_lookup_service_finish()).
|
|
* (This is a convenience method; you can also simply free the
|
|
* results by hand.)
|
|
*
|
|
* Since: 2.22
|
|
*/
|
|
void
|
|
g_resolver_free_targets (GList *targets)
|
|
{
|
|
GList *t;
|
|
|
|
for (t = targets; t; t = t->next)
|
|
g_srv_target_free (t->data);
|
|
g_list_free (targets);
|
|
}
|
|
|
|
/**
|
|
* g_resolver_lookup_records:
|
|
* @resolver: a #GResolver
|
|
* @rrname: the DNS name to lookup the record for
|
|
* @record_type: the type of DNS record to lookup
|
|
* @cancellable: (allow-none): a #GCancellable, or %NULL
|
|
* @error: return location for a #GError, or %NULL
|
|
*
|
|
* Synchronously performs a DNS record lookup for the given @rrname and returns
|
|
* a list of records as #GVariant tuples. See #GResolverRecordType for
|
|
* information on what the records contain for each @record_type.
|
|
*
|
|
* If the DNS resolution fails, @error (if non-%NULL) will be set to
|
|
* a value from #GResolverError.
|
|
*
|
|
* If @cancellable is non-%NULL, it can be used to cancel the
|
|
* operation, in which case @error (if non-%NULL) will be set to
|
|
* %G_IO_ERROR_CANCELLED.
|
|
*
|
|
* Return value: (element-type GVariant) (transfer full): a #GList of #GVariant,
|
|
* or %NULL on error. You must free each of the records and the list when you are
|
|
* done with it. (You can use g_list_free_full() with g_variant_unref() to do this.)
|
|
*
|
|
* Since: 2.34
|
|
*/
|
|
GList *
|
|
g_resolver_lookup_records (GResolver *resolver,
|
|
const gchar *rrname,
|
|
GResolverRecordType record_type,
|
|
GCancellable *cancellable,
|
|
GError **error)
|
|
{
|
|
GList *records;
|
|
|
|
g_return_val_if_fail (G_IS_RESOLVER (resolver), NULL);
|
|
g_return_val_if_fail (rrname != NULL, NULL);
|
|
|
|
g_resolver_maybe_reload (resolver);
|
|
records = G_RESOLVER_GET_CLASS (resolver)->
|
|
lookup_records (resolver, rrname, record_type, cancellable, error);
|
|
|
|
return records;
|
|
}
|
|
|
|
/**
|
|
* g_resolver_lookup_records_async:
|
|
* @resolver: a #GResolver
|
|
* @rrname: the DNS name to lookup the record for
|
|
* @record_type: the type of DNS record to lookup
|
|
* @cancellable: (allow-none): a #GCancellable, or %NULL
|
|
* @callback: (scope async): callback to call after resolution completes
|
|
* @user_data: (closure): data for @callback
|
|
*
|
|
* Begins asynchronously performing a DNS lookup for the given
|
|
* @rrname, and eventually calls @callback, which must call
|
|
* g_resolver_lookup_records_finish() to get the final result. See
|
|
* g_resolver_lookup_records() for more details.
|
|
*
|
|
* Since: 2.34
|
|
*/
|
|
void
|
|
g_resolver_lookup_records_async (GResolver *resolver,
|
|
const gchar *rrname,
|
|
GResolverRecordType record_type,
|
|
GCancellable *cancellable,
|
|
GAsyncReadyCallback callback,
|
|
gpointer user_data)
|
|
{
|
|
g_return_if_fail (G_IS_RESOLVER (resolver));
|
|
g_return_if_fail (rrname != NULL);
|
|
|
|
g_resolver_maybe_reload (resolver);
|
|
G_RESOLVER_GET_CLASS (resolver)->
|
|
lookup_records_async (resolver, rrname, record_type, cancellable, callback, user_data);
|
|
}
|
|
|
|
/**
|
|
* g_resolver_lookup_records_finish:
|
|
* @resolver: a #GResolver
|
|
* @result: the result passed to your #GAsyncReadyCallback
|
|
* @error: return location for a #GError, or %NULL
|
|
*
|
|
* Retrieves the result of a previous call to
|
|
* g_resolver_lookup_records_async(). Returns a list of records as #GVariant
|
|
* tuples. See #GResolverRecordType for information on what the records contain.
|
|
*
|
|
* If the DNS resolution failed, @error (if non-%NULL) will be set to
|
|
* a value from #GResolverError. If the operation was cancelled,
|
|
* @error will be set to %G_IO_ERROR_CANCELLED.
|
|
*
|
|
* Return value: (element-type GVariant) (transfer full): a #GList of #GVariant,
|
|
* or %NULL on error. You must free each of the records and the list when you are
|
|
* done with it. (You can use g_list_free_full() with g_variant_unref() to do this.)
|
|
*
|
|
* Since: 2.34
|
|
*/
|
|
GList *
|
|
g_resolver_lookup_records_finish (GResolver *resolver,
|
|
GAsyncResult *result,
|
|
GError **error)
|
|
{
|
|
g_return_val_if_fail (G_IS_RESOLVER (resolver), NULL);
|
|
return G_RESOLVER_GET_CLASS (resolver)->
|
|
lookup_records_finish (resolver, result, error);
|
|
}
|
|
|
|
guint64
|
|
g_resolver_get_serial (GResolver *resolver)
|
|
{
|
|
g_return_val_if_fail (G_IS_RESOLVER (resolver), 0);
|
|
|
|
g_resolver_maybe_reload (resolver);
|
|
|
|
#ifdef G_OS_UNIX
|
|
return (guint64) resolver->priv->resolv_conf_timestamp;
|
|
#else
|
|
return 1;
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* g_resolver_error_quark:
|
|
*
|
|
* Gets the #GResolver Error Quark.
|
|
*
|
|
* Return value: a #GQuark.
|
|
*
|
|
* Since: 2.22
|
|
*/
|
|
G_DEFINE_QUARK (g-resolver-error-quark, g_resolver_error)
|