path: root/src/ephy-net-monitor.c

/*
 *  Copyright © 2005, 2006 Jean-François Rameau
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */

#include "config.h"

#include "ephy-net-monitor.h"

#include "ephy-dbus.h"
#include "ephy-debug.h"
#include "ephy-settings.h"
#include "ephy-prefs.h"

#include <NetworkManager.h>

#include <gmodule.h>

typedef enum 
{
    NETWORK_UP,
    NETWORK_DOWN
} NetworkStatus;

#define EPHY_NET_MONITOR_GET_PRIVATE(object)(G_TYPE_INSTANCE_GET_PRIVATE ((object), EPHY_TYPE_NET_MONITOR, EphyNetMonitorPrivate))

struct _EphyNetMonitorPrivate
{
    DBusConnection *bus;
    guint active : 1;
    NetworkStatus status;
};

enum
{
    PROP_0,
    PROP_NETWORK_STATUS
};

G_DEFINE_TYPE (EphyNetMonitor, ephy_net_monitor, G_TYPE_OBJECT)

static void
ephy_net_monitor_set_net_status (EphyNetMonitor *monitor,
                 NetworkStatus status)
{
    EphyNetMonitorPrivate *priv = monitor->priv;

    LOG ("EphyNetMonitor turning Epiphany to %s mode",
         status != NETWORK_DOWN ? "online" : "offline");

    priv->status = status;

    g_object_notify (G_OBJECT (monitor), "network-status");
}

static void 
ephy_net_monitor_dbus_notify (DBusPendingCall *pending,
                              EphyNetMonitor *monitor) 
{
    DBusMessage* msg = dbus_pending_call_steal_reply (pending);
    
    LOG ("EphyNetMonitor getting response from dbus");

    if (!msg) return;

    if (dbus_message_get_type(msg) == DBUS_MESSAGE_TYPE_METHOD_RETURN) 
    {
        dbus_uint32_t result;

        if (dbus_message_get_args (msg, NULL, DBUS_TYPE_UINT32, &result,
                      DBUS_TYPE_INVALID)) 
        {
            NetworkStatus net_status;

            net_status = result == NM_STATE_CONNECTED ? NETWORK_UP : NETWORK_DOWN;

            LOG ("EphyNetMonitor guesses the network is %s", 
                    net_status != NETWORK_DOWN ? "up" : "down");

            ephy_net_monitor_set_net_status (monitor, net_status);
        }
        dbus_message_unref (msg);
    }
}

/* This is the heart of Net Monitor monitor */
/* ATM, if there is an active device, we say that network is up: that's all ! */
static void
ephy_net_monitor_check_network (EphyNetMonitor *monitor)
{
    EphyNetMonitorPrivate *priv = monitor->priv;
    DBusMessage *message;
    DBusPendingCall* reply;

    g_return_if_fail (priv != NULL && priv->bus != NULL);

    LOG ("EphyNetMonitor checking network");

    /* ask to Network Manager if there is at least one active device */
    message = dbus_message_new_method_call (NM_DBUS_SERVICE, 
                        NM_DBUS_PATH, 
                        NM_DBUS_INTERFACE, 
                        "state");

    if (message == NULL)
    {
        g_warning ("Couldn't allocate the dbus message");
        /* fallback: let's Epiphany roll */
        return;
    }

    if (dbus_connection_send_with_reply (priv->bus, message, &reply, -1)) 
    {
        dbus_pending_call_set_notify (reply,
                          (DBusPendingCallNotifyFunction)ephy_net_monitor_dbus_notify,
                          monitor, NULL);
        dbus_pending_call_unref (reply);
    }
    
    dbus_message_unref (message);
}

/* Filters all the messages from Network Manager */
static DBusHandlerResult
filter_func (DBusConnection *connection,
         DBusMessage *message,
         void *user_data)
{
    EphyNetMonitor *monitor;

    g_return_val_if_fail (user_data != NULL, DBUS_HANDLER_RESULT_NOT_YET_HANDLED);

    monitor = EPHY_NET_MONITOR (user_data);

    if (dbus_message_is_signal (message,
                    NM_DBUS_INTERFACE,
                    "StateChange"))
    {
        LOG ("EphyNetMonitor catches StateChange signal");

        ephy_net_monitor_check_network (monitor);

        return DBUS_HANDLER_RESULT_HANDLED;
    }

    return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
}

static void
ephy_net_monitor_attach_to_dbus (EphyNetMonitor *monitor)
{
    EphyNetMonitorPrivate *priv = monitor->priv;
    DBusError error;
    EphyDbus *dbus;
    DBusGConnection *g_connection;
    
    LOG ("EphyNetMonitor is trying to attach to SYSTEM bus");

    dbus = ephy_dbus_get_default ();

    g_connection = ephy_dbus_get_bus (dbus, EPHY_DBUS_SYSTEM);
    if (g_connection == NULL) return;
    
    priv->bus = dbus_g_connection_get_connection (g_connection);

    if (priv->bus != NULL)
    {
        dbus_connection_add_filter (priv->bus, 
                        filter_func, 
                        monitor,
                        NULL);
        dbus_error_init (&error);
        dbus_bus_add_match (priv->bus, 
                    "type='signal',interface='" NM_DBUS_INTERFACE "'", 
                    &error);
        if (dbus_error_is_set(&error)) 
        {
            g_warning("EphyNetMonitor cannot register signal handler: %s: %s", 
                  error.name, error.message);
            dbus_error_free(&error);
        }
        LOG ("EphyNetMonitor attached to SYSTEM bus");
    }
}

static void
ephy_net_monitor_detach_from_dbus (EphyNetMonitor *monitor)
{
    EphyNetMonitorPrivate *priv = monitor->priv;
    
    LOG ("EphyNetMonitor is trying to detach from SYSTEM bus");

    if (priv->bus != NULL)
    {
        dbus_connection_remove_filter (priv->bus, 
                           filter_func, 
                           monitor);
        priv->bus = NULL;
    }
}


static void
connect_to_system_bus_cb (EphyDbus *dbus,
              EphyDbusBus kind,
              EphyNetMonitor *monitor)
{
    if (kind == EPHY_DBUS_SYSTEM)
    {
        LOG ("EphyNetMonitor connecting to SYSTEM bus");

        ephy_net_monitor_attach_to_dbus (monitor);
    }
}

static void
disconnect_from_system_bus_cb (EphyDbus *dbus,
                   EphyDbusBus kind,
                   EphyNetMonitor *monitor)
{
    if (kind == EPHY_DBUS_SYSTEM)
    {
        LOG ("EphyNetMonitor disconnected from SYSTEM bus");

        /* no bus anymore */
        ephy_net_monitor_detach_from_dbus (monitor);
    }
}

static void
ephy_net_monitor_startup (EphyNetMonitor *monitor)
{
    EphyDbus *dbus;

    dbus = ephy_dbus_get_default ();

    LOG ("EphyNetMonitor starting up");

    ephy_net_monitor_attach_to_dbus (monitor);

    if (monitor->priv->bus != NULL)
        {
        /* DBUS may disconnect us at any time. So listen carefully to it */
        g_signal_connect (dbus, "connected",  
                  G_CALLBACK (connect_to_system_bus_cb), monitor);
        g_signal_connect (dbus, "disconnected",  
                  G_CALLBACK (disconnect_from_system_bus_cb), monitor);

        ephy_net_monitor_check_network (monitor);
    }
}

static void
ephy_net_monitor_shutdown (EphyNetMonitor *monitor)
{
    EphyNetMonitorPrivate *priv = monitor->priv;
    EphyDbus *dbus;

    dbus = ephy_dbus_get_default ();
            
    ephy_net_monitor_detach_from_dbus (monitor);
    g_signal_handlers_disconnect_by_func
        (dbus, G_CALLBACK (connect_to_system_bus_cb), monitor);
    g_signal_handlers_disconnect_by_func
        (dbus,G_CALLBACK (disconnect_from_system_bus_cb), monitor);
        
    priv->bus = NULL;

    LOG ("EphyNetMonitor shutdown");
}

static void
ephy_net_monitor_init (EphyNetMonitor *monitor)
{
    EphyNetMonitorPrivate *priv;

    priv = monitor->priv = EPHY_NET_MONITOR_GET_PRIVATE (monitor);

    LOG ("EphyNetMonitor initialising");

    priv->status = NETWORK_UP;

    ephy_net_monitor_startup (monitor);
}

static void
ephy_net_monitor_dispose (GObject *object)
{
    EphyNetMonitor *monitor = EPHY_NET_MONITOR (object);

    LOG ("EphyNetMonitor finalising");

    ephy_net_monitor_shutdown (monitor);

    G_OBJECT_CLASS (ephy_net_monitor_parent_class)->dispose (object);
}

static void
ephy_net_monitor_get_property (GObject *object,
                   guint prop_id,
                   GValue *value,
                   GParamSpec *pspec)
{
    EphyNetMonitor *monitor = EPHY_NET_MONITOR (object);

    switch (prop_id)
    {
        case PROP_NETWORK_STATUS:
            g_value_set_boolean (value, ephy_net_monitor_get_net_status (monitor));
            break;
    }
}

static void
ephy_net_monitor_class_init (EphyNetMonitorClass *klass)
{
    GObjectClass *object_class = G_OBJECT_CLASS (klass);

    object_class->dispose = ephy_net_monitor_dispose;
    object_class->get_property = ephy_net_monitor_get_property;

/**
 * EphyNetMonitor::network-status:
 * 
 * Whether the network is on-line.
 */
    g_object_class_install_property
        (object_class,
         PROP_NETWORK_STATUS,
         g_param_spec_boolean ("network-status",
                       "network-status",
                       "network-status",
                       FALSE,
                       G_PARAM_READABLE | G_PARAM_STATIC_NAME | G_PARAM_STATIC_NICK | G_PARAM_STATIC_BLURB));

    g_type_class_add_private (object_class, sizeof (EphyNetMonitorPrivate));
}

/* public API */

EphyNetMonitor *
ephy_net_monitor_new (void)
{
    return g_object_new (EPHY_TYPE_NET_MONITOR, NULL);
}

gboolean
ephy_net_monitor_get_net_status (EphyNetMonitor *monitor)
{
    EphyNetMonitorPrivate *priv;
    gboolean managed;

    g_return_val_if_fail (EPHY_IS_NET_MONITOR (monitor), FALSE);

    priv = monitor->priv;
    managed = g_settings_get_boolean (EPHY_SETTINGS_MAIN,
                      EPHY_PREFS_MANAGED_NETWORK);

    return !managed || priv->status != NETWORK_DOWN;
}