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

/*
 *  Copyright (C) 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 *  $Id$
 */

#include "config.h"

#include "ephy-net-monitor.h"

#include "ephy-dbus.h"
#include "ephy-shell.h"
#include "ephy-session.h"
#include "ephy-embed-single.h"
#include "eel-gconf-extensions.h"
#include "ephy-prefs.h"
#include "ephy-debug.h"

#include <NetworkManager/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 notify_id;
    guint active : 1;
    NetworkStatus status;
};

enum
{
    PROP_0,
    PROP_NETWORK_STATUS
};

static GObjectClass *parent_class;

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 NetworkStatus
ephy_net_monitor_check_for_active_device (EphyNetMonitor *monitor,
                      char *all_path[],
                      int num)
{
    EphyNetMonitorPrivate *priv = monitor->priv;
    int i;
    DBusMessage *   message = NULL;
    DBusMessage *   reply = NULL;
    const char *    iface = NULL;
    char *      op = NULL;
    dbus_uint32_t   type = 0;
    const char *    udi = NULL;
    dbus_bool_t active = FALSE;
    const char *    ip4_address = NULL;
    const char *    broadcast = NULL;
    const char *    subnetmask = NULL;
    const char *    hw_addr = NULL;
    const char *    route = NULL;
    const char *    primary_dns = NULL;
    const char *    secondary_dns = NULL;
    dbus_uint32_t   mode = 0;
    dbus_int32_t    strength = -1;
    char *      active_network_path = NULL;
    dbus_bool_t link_active = FALSE;
    dbus_uint32_t   caps = NM_DEVICE_CAP_NONE;
    char **     networks = NULL;
    int     num_networks = 0;
    NMActStage  act_stage = NM_ACT_STAGE_UNKNOWN;
    NetworkStatus status = NETWORK_DOWN;

    for (i = 0; i < num; i++)
    {
        const char *path = all_path [i];
        DBusError error;

        message = dbus_message_new_method_call (NM_DBUS_SERVICE, 
                            path, 
                            NM_DBUS_INTERFACE_DEVICES, 
                            "getProperties");
        if (message == NULL)
        {
            g_warning ("EphyNetMonitor: couldn't allocate the dbus message");
            status = NETWORK_UP;
            break;
        }

        reply = dbus_connection_send_with_reply_and_block (priv->bus, message, -1, NULL);
        dbus_message_unref (message);

        if (reply == NULL)
        {
            g_warning ("EphyNetMonitor: "
                   "didn't get a reply from NetworkManager for device %s.\n", path);
            status = NETWORK_UP;
            break;
        }

        dbus_error_init (&error);
        if (dbus_message_get_args (reply, &error, DBUS_TYPE_OBJECT_PATH, &op,
                    DBUS_TYPE_STRING, &iface,
                    DBUS_TYPE_UINT32, &type,
                    DBUS_TYPE_STRING, &udi,
                    DBUS_TYPE_BOOLEAN,&active,
                    DBUS_TYPE_UINT32, &act_stage,
                    DBUS_TYPE_STRING, &ip4_address,
                    DBUS_TYPE_STRING, &subnetmask,
                    DBUS_TYPE_STRING, &broadcast,
                    DBUS_TYPE_STRING, &hw_addr,
                    DBUS_TYPE_STRING, &route,
                    DBUS_TYPE_STRING, &primary_dns,
                    DBUS_TYPE_STRING, &secondary_dns,
                    DBUS_TYPE_UINT32, &mode,
                    DBUS_TYPE_INT32,  &strength,
                    DBUS_TYPE_BOOLEAN,&link_active,
                    DBUS_TYPE_UINT32, &caps,
                    DBUS_TYPE_STRING, &active_network_path,
                    DBUS_TYPE_ARRAY, DBUS_TYPE_STRING, &networks, &num_networks,
                    DBUS_TYPE_INVALID))
        {
            dbus_message_unref (reply);

            /* found one active device */
            if (active)
            {
                status = NETWORK_UP;
                break;
            }
        }
        else
        {
            g_warning ("EphyNetMonitor: "
                   "unexpected reply from NetworkManager for device %s.\n", path);
            if (dbus_error_is_set(&error))
            {
                g_warning ("EphyNetMonitor: %s: %s", error.name, error.message);
                dbus_error_free(&error);
            }

            status = NETWORK_UP;

            break;
        }
    }

    return active;
}

/* 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 gboolean
ephy_net_monitor_network_status (EphyNetMonitor *monitor)
{
    EphyNetMonitorPrivate *priv = monitor->priv;
    DBusMessage *message, *reply;
    DBusError error;
    NetworkStatus net_status;

    /* 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, 
                        "getDevices");

    if (message == NULL)
    {
        g_warning ("Couldn't allocate the dbus message");
        /* fallbak: let's Epiphany roll */
        return NETWORK_UP;
    }
    dbus_error_init (&error);
    reply = dbus_connection_send_with_reply_and_block (priv->bus, 
                               message, 
                               -1, 
                               &error);
    if (dbus_error_is_set (&error))
    {
        if (dbus_error_has_name (&error, NM_DBUS_NO_DEVICES_ERROR))
        {
            LOG ("EphyNetMonitor: Network Manager says - no available network devices -");

            net_status = NETWORK_DOWN;
        }
        else
        {
            LOG ("EphyNetMonitor can't talk to Network Manager: %s: %s", 
                 error.name, error.message);

            /* fallback */
            net_status = NETWORK_UP;
        }

        dbus_error_free(&error);
    }
    else
    {
        if (reply == NULL)
        {
            g_warning("EphyNetMonitor got NULL reply");

            /* fallback */          
            net_status = NETWORK_UP;
        }
        else
        {
            /* check if we have at least one active device */
            char **paths = NULL;
            int num = -1;

            if (!dbus_message_get_args (reply, 
                            NULL, 
                            DBUS_TYPE_ARRAY, 
                            DBUS_TYPE_OBJECT_PATH, 
                            &paths, 
                            &num, 
                            DBUS_TYPE_INVALID))
            {
                g_warning ("EphyNetMonitor: unexpected reply from NetworkManager");
                dbus_message_unref (reply);
                net_status = NETWORK_UP;
            }
            else
            {
                net_status = ephy_net_monitor_check_for_active_device
                        (monitor, paths, num);
            }
        }
    }

    if (reply)
    {
        dbus_message_unref (reply);
    }
    
    if (message)
    {
        dbus_message_unref (message);
    }

    return net_status;
}

static void
ephy_net_monitor_check_network (EphyNetMonitor *monitor)
{
    NetworkStatus net_status;
    
    net_status = ephy_net_monitor_network_status (monitor);

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

    ephy_net_monitor_set_net_status (monitor, net_status);
}

/* 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,
                    "DeviceNoLongerActive"))
    {
        LOG ("EphyNetMonitor catches DeviceNoLongerActive signal");

        ephy_net_monitor_check_network (monitor);

        return DBUS_HANDLER_RESULT_HANDLED;
    }
    if (dbus_message_is_signal (message,
                    NM_DBUS_INTERFACE,
                    "DeviceNowActive"))
    {
        LOG ("EphyNetMonitor catches DeviceNowActive signal");

        ephy_net_monitor_set_net_status (monitor, NETWORK_UP);

        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);
    g_return_if_fail (g_connection != NULL);
    
    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
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)
{
    EphyNetMonitorPrivate *priv = monitor->priv;

    if (kind == EPHY_DBUS_SYSTEM)
    {
        LOG ("EphyNetMonitor disconnected from SYSTEM bus");

        /* no bus anymore */
        priv->bus = NULL;
    }
}

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);

    /* 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);

    /* FIXME what if the system bus isn't available right now? */
    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 ();
            
    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
notify_network_managed_cb (GConfClient *client,
               guint cnxn_id,
               GConfEntry *entry,
               EphyNetMonitor *monitor)
{
    EphyNetMonitorPrivate *priv = monitor->priv;
    GConfValue *value;
    gboolean active = TRUE;

    LOG (CONF_NETWORK_MANAGED " key changed");

    g_assert (entry != NULL);

    value = gconf_entry_get_value (entry);
    if (value != NULL && value->type == GCONF_VALUE_BOOL)
    {
        active = gconf_value_get_bool (value);
    }

    priv->active = active;

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

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;

    priv->notify_id = eel_gconf_notification_add
        (CONF_NETWORK_MANAGED,
         (GConfClientNotifyFunc) notify_network_managed_cb,
         monitor);
    eel_gconf_notify (CONF_NETWORK_MANAGED);

    ephy_net_monitor_startup (monitor);
}

static void
ephy_net_monitor_dispose (GObject *object)
{
    EphyNetMonitor *monitor = EPHY_NET_MONITOR (object);
    EphyNetMonitorPrivate *priv = monitor->priv;

    LOG ("EphyNetMonitor finalising");

    ephy_net_monitor_shutdown (monitor);

    if (priv->notify_id != 0)
    {
        eel_gconf_notification_remove (priv->notify_id);
        priv->notify_id = 0;
    }

    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);

    parent_class = g_type_class_peek_parent (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 */

GType
ephy_net_monitor_get_type (void)
{
    static GType type = 0;

    if (G_UNLIKELY (type == 0))
    {
        static const GTypeInfo our_info =
        {
            sizeof (EphyShellClass),
            NULL, /* base_init */
            NULL, /* base_finalize */
            (GClassInitFunc) ephy_net_monitor_class_init,
            NULL,
            NULL, /* class_data */
            sizeof (EphyNetMonitor),
            0, /* n_preallocs */
            (GInstanceInitFunc) ephy_net_monitor_init
        };

        type = g_type_register_static (G_TYPE_OBJECT,
                           "EphyNetMonitor",
                           &our_info, 0);
    }

    return type;
}

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;

    g_return_val_if_fail (EPHY_IS_NET_MONITOR (monitor), FALSE);

    priv = monitor->priv;

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