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425 lines
15 KiB
C
425 lines
15 KiB
C
/* GIO - GLib Input, Output and Streaming Library
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*
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* Copyright 2011 Red Hat, Inc
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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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#include "config.h"
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#include "glib.h"
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#include "glibintl.h"
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#include "gnetworkmonitor.h"
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#include "ginetaddress.h"
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#include "ginetsocketaddress.h"
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#include "ginitable.h"
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#include "gioenumtypes.h"
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#include "giomodule-priv.h"
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#include "gtask.h"
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/**
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* SECTION:gnetworkmonitor
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* @title: GNetworkMonitor
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* @short_description: Network status monitor
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* @include: gio/gio.h
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*
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* #GNetworkMonitor provides an easy-to-use cross-platform API
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* for monitoring network connectivity. On Linux, the available
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* implementations are based on the kernel's netlink interface and
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* on NetworkManager.
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*
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* There is also an implementation for use inside Flatpak sandboxes.
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*/
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/**
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* GNetworkMonitor:
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*
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* #GNetworkMonitor monitors the status of network connections and
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* indicates when a possibly-user-visible change has occurred.
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*
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* Since: 2.32
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*/
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/**
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* GNetworkMonitorInterface:
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* @g_iface: The parent interface.
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* @network_changed: the virtual function pointer for the
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* GNetworkMonitor::network-changed signal.
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* @can_reach: the virtual function pointer for g_network_monitor_can_reach()
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* @can_reach_async: the virtual function pointer for
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* g_network_monitor_can_reach_async()
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* @can_reach_finish: the virtual function pointer for
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* g_network_monitor_can_reach_finish()
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*
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* The virtual function table for #GNetworkMonitor.
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*
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* Since: 2.32
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*/
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G_DEFINE_INTERFACE_WITH_CODE (GNetworkMonitor, g_network_monitor, G_TYPE_OBJECT,
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g_type_interface_add_prerequisite (g_define_type_id, G_TYPE_INITABLE))
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enum {
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NETWORK_CHANGED,
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LAST_SIGNAL
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};
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static guint signals[LAST_SIGNAL] = { 0 };
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static GNetworkMonitor *network_monitor_default_singleton = NULL; /* (owned) (atomic) */
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/**
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* g_network_monitor_get_default:
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*
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* Gets the default #GNetworkMonitor for the system.
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*
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* Returns: (not nullable) (transfer none): a #GNetworkMonitor, which will be
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* a dummy object if no network monitor is available
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*
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* Since: 2.32
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*/
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GNetworkMonitor *
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g_network_monitor_get_default (void)
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{
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if (g_once_init_enter (&network_monitor_default_singleton))
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{
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GNetworkMonitor *singleton;
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singleton = _g_io_module_get_default (G_NETWORK_MONITOR_EXTENSION_POINT_NAME,
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"GIO_USE_NETWORK_MONITOR",
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NULL);
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g_once_init_leave (&network_monitor_default_singleton, singleton);
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}
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return network_monitor_default_singleton;
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}
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/**
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* g_network_monitor_get_network_available:
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* @monitor: the #GNetworkMonitor
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*
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* Checks if the network is available. "Available" here means that the
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* system has a default route available for at least one of IPv4 or
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* IPv6. It does not necessarily imply that the public Internet is
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* reachable. See #GNetworkMonitor:network-available for more details.
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*
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* Returns: whether the network is available
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*
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* Since: 2.32
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*/
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gboolean
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g_network_monitor_get_network_available (GNetworkMonitor *monitor)
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{
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gboolean available = FALSE;
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g_object_get (G_OBJECT (monitor), "network-available", &available, NULL);
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return available;
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}
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/**
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* g_network_monitor_get_network_metered:
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* @monitor: the #GNetworkMonitor
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*
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* Checks if the network is metered.
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* See #GNetworkMonitor:network-metered for more details.
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*
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* Returns: whether the connection is metered
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*
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* Since: 2.46
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*/
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gboolean
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g_network_monitor_get_network_metered (GNetworkMonitor *monitor)
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{
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gboolean metered = FALSE;
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g_object_get (G_OBJECT (monitor), "network-metered", &metered, NULL);
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return metered;
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}
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/**
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* g_network_monitor_get_connectivity:
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* @monitor: the #GNetworkMonitor
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*
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* Gets a more detailed networking state than
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* g_network_monitor_get_network_available().
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*
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* If #GNetworkMonitor:network-available is %FALSE, then the
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* connectivity state will be %G_NETWORK_CONNECTIVITY_LOCAL.
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*
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* If #GNetworkMonitor:network-available is %TRUE, then the
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* connectivity state will be %G_NETWORK_CONNECTIVITY_FULL (if there
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* is full Internet connectivity), %G_NETWORK_CONNECTIVITY_LIMITED (if
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* the host has a default route, but appears to be unable to actually
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* reach the full Internet), or %G_NETWORK_CONNECTIVITY_PORTAL (if the
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* host is trapped behind a "captive portal" that requires some sort
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* of login or acknowledgement before allowing full Internet access).
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*
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* Note that in the case of %G_NETWORK_CONNECTIVITY_LIMITED and
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* %G_NETWORK_CONNECTIVITY_PORTAL, it is possible that some sites are
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* reachable but others are not. In this case, applications can
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* attempt to connect to remote servers, but should gracefully fall
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* back to their "offline" behavior if the connection attempt fails.
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*
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* Return value: the network connectivity state
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*
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* Since: 2.44
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*/
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GNetworkConnectivity
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g_network_monitor_get_connectivity (GNetworkMonitor *monitor)
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{
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GNetworkConnectivity connectivity;
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g_object_get (G_OBJECT (monitor), "connectivity", &connectivity, NULL);
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return connectivity;
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}
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/**
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* g_network_monitor_can_reach:
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* @monitor: a #GNetworkMonitor
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* @connectable: a #GSocketConnectable
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* @cancellable: (nullable): a #GCancellable, or %NULL
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* @error: return location for a #GError, or %NULL
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*
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* Attempts to determine whether or not the host pointed to by
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* @connectable can be reached, without actually trying to connect to
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* it.
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*
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* This may return %TRUE even when #GNetworkMonitor:network-available
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* is %FALSE, if, for example, @monitor can determine that
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* @connectable refers to a host on a local network.
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*
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* If @monitor believes that an attempt to connect to @connectable
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* will succeed, it will return %TRUE. Otherwise, it will return
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* %FALSE and set @error to an appropriate error (such as
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* %G_IO_ERROR_HOST_UNREACHABLE).
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*
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* Note that although this does not attempt to connect to
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* @connectable, it may still block for a brief period of time (eg,
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* trying to do multicast DNS on the local network), so if you do not
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* want to block, you should use g_network_monitor_can_reach_async().
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*
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* Returns: %TRUE if @connectable is reachable, %FALSE if not.
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*
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* Since: 2.32
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*/
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gboolean
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g_network_monitor_can_reach (GNetworkMonitor *monitor,
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GSocketConnectable *connectable,
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GCancellable *cancellable,
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GError **error)
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{
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GNetworkMonitorInterface *iface;
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iface = G_NETWORK_MONITOR_GET_INTERFACE (monitor);
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return iface->can_reach (monitor, connectable, cancellable, error);
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}
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static void
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g_network_monitor_real_can_reach_async (GNetworkMonitor *monitor,
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GSocketConnectable *connectable,
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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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GTask *task;
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GError *error = NULL;
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task = g_task_new (monitor, cancellable, callback, user_data);
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g_task_set_source_tag (task, g_network_monitor_real_can_reach_async);
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if (g_network_monitor_can_reach (monitor, connectable, cancellable, &error))
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g_task_return_boolean (task, TRUE);
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else
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g_task_return_error (task, error);
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g_object_unref (task);
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}
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/**
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* g_network_monitor_can_reach_async:
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* @monitor: a #GNetworkMonitor
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* @connectable: a #GSocketConnectable
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* @cancellable: (nullable): a #GCancellable, or %NULL
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* @callback: (scope async): a #GAsyncReadyCallback
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* to call when the request is satisfied
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* @user_data: the data to pass to callback function
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*
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* Asynchronously attempts to determine whether or not the host
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* pointed to by @connectable can be reached, without actually
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* trying to connect to it.
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*
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* For more details, see g_network_monitor_can_reach().
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*
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* When the operation is finished, @callback will be called.
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* You can then call g_network_monitor_can_reach_finish()
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* to get the result of the operation.
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*/
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void
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g_network_monitor_can_reach_async (GNetworkMonitor *monitor,
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GSocketConnectable *connectable,
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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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GNetworkMonitorInterface *iface;
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iface = G_NETWORK_MONITOR_GET_INTERFACE (monitor);
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iface->can_reach_async (monitor, connectable, cancellable, callback, user_data);
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}
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static gboolean
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g_network_monitor_real_can_reach_finish (GNetworkMonitor *monitor,
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GAsyncResult *result,
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GError **error)
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{
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g_return_val_if_fail (g_task_is_valid (result, monitor), FALSE);
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return g_task_propagate_boolean (G_TASK (result), error);
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}
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/**
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* g_network_monitor_can_reach_finish:
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* @monitor: a #GNetworkMonitor
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* @result: a #GAsyncResult
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* @error: return location for errors, or %NULL
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*
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* Finishes an async network connectivity test.
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* See g_network_monitor_can_reach_async().
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*
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* Returns: %TRUE if network is reachable, %FALSE if not.
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*/
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gboolean
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g_network_monitor_can_reach_finish (GNetworkMonitor *monitor,
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GAsyncResult *result,
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GError **error)
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{
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GNetworkMonitorInterface *iface;
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iface = G_NETWORK_MONITOR_GET_INTERFACE (monitor);
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return iface->can_reach_finish (monitor, result, error);
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}
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static void
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g_network_monitor_default_init (GNetworkMonitorInterface *iface)
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{
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iface->can_reach_async = g_network_monitor_real_can_reach_async;
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iface->can_reach_finish = g_network_monitor_real_can_reach_finish;
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/**
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* GNetworkMonitor::network-changed:
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* @monitor: a #GNetworkMonitor
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* @network_available: the current value of #GNetworkMonitor:network-available
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*
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* Emitted when the network configuration changes.
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*
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* Since: 2.32
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*/
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signals[NETWORK_CHANGED] =
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g_signal_new (I_("network-changed"),
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G_TYPE_NETWORK_MONITOR,
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G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GNetworkMonitorInterface, network_changed),
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NULL, NULL,
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NULL,
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G_TYPE_NONE, 1,
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G_TYPE_BOOLEAN);
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/**
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* GNetworkMonitor:network-available:
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*
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* Whether the network is considered available. That is, whether the
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* system has a default route for at least one of IPv4 or IPv6.
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*
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* Real-world networks are of course much more complicated than
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* this; the machine may be connected to a wifi hotspot that
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* requires payment before allowing traffic through, or may be
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* connected to a functioning router that has lost its own upstream
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* connectivity. Some hosts might only be accessible when a VPN is
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* active. Other hosts might only be accessible when the VPN is
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* not active. Thus, it is best to use g_network_monitor_can_reach()
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* or g_network_monitor_can_reach_async() to test for reachability
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* on a host-by-host basis. (On the other hand, when the property is
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* %FALSE, the application can reasonably expect that no remote
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* hosts at all are reachable, and should indicate this to the user
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* in its UI.)
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*
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* See also #GNetworkMonitor::network-changed.
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*
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* Since: 2.32
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*/
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g_object_interface_install_property (iface,
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g_param_spec_boolean ("network-available",
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P_("Network available"),
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P_("Whether the network is available"),
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FALSE,
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G_PARAM_READABLE |
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G_PARAM_STATIC_STRINGS));
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/**
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* GNetworkMonitor:network-metered:
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*
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* Whether the network is considered metered.
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*
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* That is, whether the
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* system has traffic flowing through the default connection that is
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* subject to limitations set by service providers. For example, traffic
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* might be billed by the amount of data transmitted, or there might be a
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* quota on the amount of traffic per month. This is typical with tethered
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* connections (3G and 4G) and in such situations, bandwidth intensive
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* applications may wish to avoid network activity where possible if it will
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* cost the user money or use up their limited quota. Anything more than a
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* few hundreds of kilobytes of data usage per hour should be avoided without
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* asking permission from the user.
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*
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* If more information is required about specific devices then the
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* system network management API should be used instead (for example,
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* NetworkManager or ConnMan).
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*
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* If this information is not available then no networks will be
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* marked as metered.
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*
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* See also #GNetworkMonitor:network-available.
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*
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* Since: 2.46
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*/
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g_object_interface_install_property (iface,
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g_param_spec_boolean ("network-metered",
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P_("Network metered"),
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P_("Whether the network is metered"),
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FALSE,
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G_PARAM_READABLE |
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G_PARAM_STATIC_STRINGS));
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/**
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* GNetworkMonitor:connectivity:
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*
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* More detailed information about the host's network connectivity.
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* See g_network_monitor_get_connectivity() and
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* #GNetworkConnectivity for more details.
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*
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* Since: 2.44
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*/
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g_object_interface_install_property (iface,
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g_param_spec_enum ("connectivity",
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P_("Network connectivity"),
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P_("Level of network connectivity"),
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G_TYPE_NETWORK_CONNECTIVITY,
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G_NETWORK_CONNECTIVITY_FULL,
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G_PARAM_READABLE |
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G_PARAM_STATIC_STRINGS));
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}
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