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/* -*- Mode: C; c-file-style: "gnu"; tab-width: 8 -*- */
/* Copyright (C) 2007 Carlos Garnacho
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, 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.
*
* Authors: Carlos Garnacho Parro <carlosg@gnome.org>
*/
#include <glib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include "iface-state-monitor.h"
#define BUF_SIZE 4096
typedef struct MonitorData MonitorData;
struct MonitorData {
OobsIfacesConfig *config;
IfaceStateMonitorFunc func;
GIOChannel *channel;
guint channel_source_id;
};
static gpointer
get_message_attribute (MonitorData *data,
struct nlmsghdr *msg_netlink,
size_t size,
gushort type)
{
struct rtattr *rt_attr;
rt_attr = NLMSG_DATA (msg_netlink) + NLMSG_ALIGN (sizeof (struct ifinfomsg));
while (RTA_OK (rt_attr, size))
{
if (rt_attr->rta_type == type)
return RTA_DATA (rt_attr);
rt_attr = RTA_NEXT (rt_attr, size);
}
return NULL;
}
static void
read_message (MonitorData *data,
struct nlmsghdr *msg_netlink,
size_t size)
{
struct ifinfomsg *if_info;
const gchar *iface_name;
gboolean iface_active;
if_info = NLMSG_DATA (msg_netlink);
iface_name = get_message_attribute (data, msg_netlink, size, IFLA_IFNAME);
iface_active = if_info->ifi_flags & IFF_UP;
if (iface_name)
(data->func) (data->config, iface_name, iface_active);
}
static gboolean
monitor_data_channel_watch (GIOChannel *channel,
GIOCondition condition,
MonitorData *data)
{
gint fd;
ssize_t size;
char buf[BUF_SIZE];
struct msghdr msg = { 0, };
struct iovec iovec = { 0, };
struct nlmsghdr *msg_netlink;
fd = g_io_channel_unix_get_fd (channel);
iovec.iov_base = buf;
iovec.iov_len = BUF_SIZE;
/* setup scatter/gather array */
msg.msg_iov = (void *) &iovec;
msg.msg_iovlen = 1;
size = recvmsg (fd, &msg, 0);
if (size < 0)
{
g_warning ("Could not get netlink message\n");
return TRUE;
}
/* point to first message */
msg_netlink = (struct nlmsghdr *) &buf;
while (NLMSG_OK (msg_netlink, size))
{
read_message (data, msg_netlink, size);
msg_netlink = NLMSG_NEXT (msg_netlink, size);
}
return TRUE;
}
static void
monitor_data_free (MonitorData *data)
{
if (data->channel_source_id)
{
g_source_remove (data->channel_source_id);
data->channel_source_id = 0;
}
g_io_channel_shutdown (data->channel, FALSE, NULL);
g_io_channel_unref (data->channel);
}
static MonitorData*
init_monitor_data (OobsIfacesConfig *config,
IfaceStateMonitorFunc func)
{
MonitorData *data;
struct sockaddr_nl addr = { 0, };
gint fd;
fd = socket (AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
addr.nl_family = AF_NETLINK;
addr.nl_pad = 0;
addr.nl_pid = getpid ();
addr.nl_groups = RTMGRP_LINK;
if (bind (fd, (struct sockaddr *) &addr, sizeof (addr)) != 0)
return NULL;
data = g_new0 (MonitorData, 1);
data->func = func;
data->config = config;
data->channel = g_io_channel_unix_new (fd);
data->channel_source_id = g_io_add_watch (data->channel,
G_IO_IN | G_IO_ERR | G_IO_HUP,
(GIOFunc) monitor_data_channel_watch,
data);
return data;
}
void
iface_state_monitor_init (OobsIfacesConfig *config,
IfaceStateMonitorFunc func)
{
static GQuark quark = 0;
MonitorData *data;
g_return_if_fail (OOBS_IS_IFACES_CONFIG (config));
g_return_if_fail (func != NULL);
if (G_UNLIKELY (!quark))
quark = g_quark_from_static_string ("iface-state-monitor-data");
data = init_monitor_data (config, func);
g_object_set_qdata_full (G_OBJECT (config), quark,
data, (GDestroyNotify) monitor_data_free);
}
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