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Without a timeout, some lookup requests can go on forever, typically due to bugs in underlying systems. This can have particularly significant effects on the Happy Eyeballs algorithm in `GSocketClient`, which relies on multiple name lookups as its first step. Signed-off-by: Philip Withnall <pwithnall@endlessos.org> Helps: #2866
300 lines
17 KiB
C
300 lines
17 KiB
C
/* 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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* Copyright (C) 2018 Igalia S.L.
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*
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* SPDX-License-Identifier: LGPL-2.1-or-later
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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 2.1 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, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __G_RESOLVER_H__
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#define __G_RESOLVER_H__
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#if !defined (__GIO_GIO_H_INSIDE__) && !defined (GIO_COMPILATION)
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#error "Only <gio/gio.h> can be included directly."
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#endif
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#include <gio/giotypes.h>
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G_BEGIN_DECLS
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#define G_TYPE_RESOLVER (g_resolver_get_type ())
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#define G_RESOLVER(o) (G_TYPE_CHECK_INSTANCE_CAST ((o), G_TYPE_RESOLVER, GResolver))
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#define G_RESOLVER_CLASS(k) (G_TYPE_CHECK_CLASS_CAST((k), G_TYPE_RESOLVER, GResolverClass))
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#define G_IS_RESOLVER(o) (G_TYPE_CHECK_INSTANCE_TYPE ((o), G_TYPE_RESOLVER))
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#define G_IS_RESOLVER_CLASS(k) (G_TYPE_CHECK_CLASS_TYPE ((k), G_TYPE_RESOLVER))
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#define G_RESOLVER_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS ((o), G_TYPE_RESOLVER, GResolverClass))
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typedef struct _GResolverPrivate GResolverPrivate;
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typedef struct _GResolverClass GResolverClass;
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struct _GResolver {
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GObject parent_instance;
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GResolverPrivate *priv;
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};
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/**
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* GResolverNameLookupFlags:
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* @G_RESOLVER_NAME_LOOKUP_FLAGS_DEFAULT: default behavior (same as g_resolver_lookup_by_name())
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* @G_RESOLVER_NAME_LOOKUP_FLAGS_IPV4_ONLY: only resolve ipv4 addresses
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* @G_RESOLVER_NAME_LOOKUP_FLAGS_IPV6_ONLY: only resolve ipv6 addresses
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*
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* Flags to modify lookup behavior.
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*
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* Since: 2.60
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*/
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typedef enum {
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G_RESOLVER_NAME_LOOKUP_FLAGS_DEFAULT = 0,
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G_RESOLVER_NAME_LOOKUP_FLAGS_IPV4_ONLY = 1 << 0,
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G_RESOLVER_NAME_LOOKUP_FLAGS_IPV6_ONLY = 1 << 1,
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} GResolverNameLookupFlags;
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struct _GResolverClass {
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GObjectClass parent_class;
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/* Signals */
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void ( *reload) (GResolver *resolver);
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/* Virtual methods */
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GList * ( *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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void ( *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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GList * ( *lookup_by_name_finish) (GResolver *resolver,
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GAsyncResult *result,
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GError **error);
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gchar * ( *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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void ( *lookup_by_address_async) (GResolver *resolver,
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GInetAddress *address,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data);
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gchar * ( *lookup_by_address_finish) (GResolver *resolver,
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GAsyncResult *result,
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GError **error);
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GList * ( *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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void ( *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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GList * ( *lookup_service_finish) (GResolver *resolver,
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GAsyncResult *result,
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GError **error);
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GList * ( *lookup_records) (GResolver *resolver,
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const gchar *rrname,
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GResolverRecordType record_type,
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GCancellable *cancellable,
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GError **error);
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void ( *lookup_records_async) (GResolver *resolver,
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const gchar *rrname,
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GResolverRecordType record_type,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data);
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GList * ( *lookup_records_finish) (GResolver *resolver,
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GAsyncResult *result,
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GError **error);
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/**
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* GResolverClass::lookup_by_name_with_flags_async:
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* @resolver: a #GResolver
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* @hostname: the hostname to resolve
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* @flags: extra #GResolverNameLookupFlags to modify the lookup
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* @cancellable: (nullable): a #GCancellable
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* @callback: (scope async): a #GAsyncReadyCallback to call when completed
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* @user_data: (closure): data to pass to @callback
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*
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* Asynchronous version of GResolverClass::lookup_by_name_with_flags
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*
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* GResolverClass::lookup_by_name_with_flags_finish will be called to get
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* the result.
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*
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* Since: 2.60
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*/
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void ( *lookup_by_name_with_flags_async) (GResolver *resolver,
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const gchar *hostname,
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GResolverNameLookupFlags flags,
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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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* GResolverClass::lookup_by_name_with_flags_finish:
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* @resolver: a #GResolver
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* @result: a #GAsyncResult
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* @error: (nullable): a pointer to a %NULL #GError
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*
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* Gets the result from GResolverClass::lookup_by_name_with_flags_async
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*
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* Returns: (element-type GInetAddress) (transfer full): List of #GInetAddress.
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* Since: 2.60
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*/
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GList * ( *lookup_by_name_with_flags_finish) (GResolver *resolver,
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GAsyncResult *result,
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GError **error);
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/**
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* GResolverClass::lookup_by_name_with_flags:
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* @resolver: a #GResolver
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* @hostname: the hostname to resolve
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* @flags: extra #GResolverNameLookupFlags to modify the lookup
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* @cancellable: (nullable): a #GCancellable
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* @error: (nullable): a pointer to a %NULL #GError
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*
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* This is identical to GResolverClass::lookup_by_name except it takes
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* @flags which modifies the behavior of the lookup. See #GResolverNameLookupFlags
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* for more details.
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*
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* Returns: (element-type GInetAddress) (transfer full): List of #GInetAddress.
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* Since: 2.60
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*/
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GList * ( *lookup_by_name_with_flags) (GResolver *resolver,
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const gchar *hostname,
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GResolverNameLookupFlags flags,
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GCancellable *cancellable,
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GError **error);
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};
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GIO_AVAILABLE_IN_ALL
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GType g_resolver_get_type (void) G_GNUC_CONST;
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GIO_AVAILABLE_IN_ALL
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GResolver *g_resolver_get_default (void);
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GIO_AVAILABLE_IN_ALL
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void g_resolver_set_default (GResolver *resolver);
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GIO_AVAILABLE_IN_ALL
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GList *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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GIO_AVAILABLE_IN_ALL
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void 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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GIO_AVAILABLE_IN_ALL
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GList *g_resolver_lookup_by_name_finish (GResolver *resolver,
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GAsyncResult *result,
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GError **error);
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GIO_AVAILABLE_IN_2_60
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void g_resolver_lookup_by_name_with_flags_async (GResolver *resolver,
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const gchar *hostname,
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GResolverNameLookupFlags flags,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data);
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GIO_AVAILABLE_IN_2_60
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GList *g_resolver_lookup_by_name_with_flags_finish (GResolver *resolver,
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GAsyncResult *result,
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GError **error);
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GIO_AVAILABLE_IN_2_60
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GList *g_resolver_lookup_by_name_with_flags (GResolver *resolver,
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const gchar *hostname,
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GResolverNameLookupFlags flags,
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GCancellable *cancellable,
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GError **error);
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GIO_AVAILABLE_IN_ALL
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void g_resolver_free_addresses (GList *addresses);
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GIO_AVAILABLE_IN_ALL
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gchar *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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GIO_AVAILABLE_IN_ALL
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void g_resolver_lookup_by_address_async (GResolver *resolver,
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GInetAddress *address,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data);
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GIO_AVAILABLE_IN_ALL
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gchar *g_resolver_lookup_by_address_finish (GResolver *resolver,
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GAsyncResult *result,
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GError **error);
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GIO_AVAILABLE_IN_ALL
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GList *g_resolver_lookup_service (GResolver *resolver,
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const gchar *service,
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const gchar *protocol,
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const gchar *domain,
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GCancellable *cancellable,
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GError **error);
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GIO_AVAILABLE_IN_ALL
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void g_resolver_lookup_service_async (GResolver *resolver,
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const gchar *service,
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const gchar *protocol,
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const gchar *domain,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data);
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GIO_AVAILABLE_IN_ALL
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GList *g_resolver_lookup_service_finish (GResolver *resolver,
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GAsyncResult *result,
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GError **error);
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GIO_AVAILABLE_IN_2_34
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GList *g_resolver_lookup_records (GResolver *resolver,
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const gchar *rrname,
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GResolverRecordType record_type,
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GCancellable *cancellable,
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GError **error);
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GIO_AVAILABLE_IN_2_34
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void g_resolver_lookup_records_async (GResolver *resolver,
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const gchar *rrname,
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GResolverRecordType record_type,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data);
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GIO_AVAILABLE_IN_2_34
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GList *g_resolver_lookup_records_finish (GResolver *resolver,
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GAsyncResult *result,
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GError **error);
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GIO_AVAILABLE_IN_ALL
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void g_resolver_free_targets (GList *targets);
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GIO_AVAILABLE_IN_2_78
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unsigned g_resolver_get_timeout (GResolver *resolver);
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GIO_AVAILABLE_IN_2_78
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void g_resolver_set_timeout (GResolver *resolver,
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unsigned timeout_ms);
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/**
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* G_RESOLVER_ERROR:
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*
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* Error domain for #GResolver. Errors in this domain will be from the
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* #GResolverError enumeration. See #GError for more information on
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* error domains.
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*/
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#define G_RESOLVER_ERROR (g_resolver_error_quark ())
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GIO_AVAILABLE_IN_ALL
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GQuark g_resolver_error_quark (void);
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G_END_DECLS
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#endif /* __G_RESOLVER_H__ */
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