NetworkManager/system-settings/plugins/ifupdown/plugin.c

/* -*- Mode: C; tab-width: 5; indent-tabs-mode: t; c-basic-offset: 5 -*- */

/* NetworkManager system settings service (ifupdown)
 *
 * Alexander Sack <asac@ubuntu.com>
 *
 * 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 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.
 *
 * (C) Copyright 2007,2008 Canonical Ltd.
 */

#include <string.h>
#include <sys/inotify.h>

#include <gmodule.h>
#include <glib-object.h>
#include <glib/gi18n.h>
#include <glib/gslist.h>
#include <nm-setting-connection.h>

#include "interface_parser.h"

#include "nm-system-config-interface.h"
#include "nm-setting-ip4-config.h"
#include "nm-setting-wireless.h"
#include "nm-setting-wired.h"
#include "nm-setting-ppp.h"

#include "nm-ifupdown-connection.h"
#include "plugin.h"
#include "parser.h"
#include "nm-inotify-helper.h"

#include <nm-utils.h>
#include <sha1.h>

#include <arpa/inet.h>

#define IFUPDOWN_PLUGIN_NAME "ifupdown"
#define IFUPDOWN_PLUGIN_INFO "(C) 2008 Canonical Ltd.  To report bugs please use the NetworkManager mailing list."
#define IFUPDOWN_SYSTEM_HOSTNAME_FILE "/etc/hostname"

typedef struct {

	DBusGConnection *g_connection;
	NMSystemConfigHalManager *hal_mgr;

	GHashTable *iface_connections;
	gchar* hostname;

	gulong inotify_event_id;
	int inotify_system_hostname_wd;
} SCPluginIfupdownPrivate;

static void
system_config_interface_init (NMSystemConfigInterface *system_config_interface_class);

G_DEFINE_TYPE_EXTENDED (SCPluginIfupdown, sc_plugin_ifupdown, G_TYPE_OBJECT, 0,
				    G_IMPLEMENT_INTERFACE (NM_TYPE_SYSTEM_CONFIG_INTERFACE,
									  system_config_interface_init))

#define SC_PLUGIN_IFUPDOWN_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), SC_TYPE_PLUGIN_IFUPDOWN, SCPluginIfupdownPrivate))

static void
sc_plugin_ifupdown_class_init (SCPluginIfupdownClass *req_class);

static void
SCPluginIfupdown_init (NMSystemConfigInterface *config,
				   NMSystemConfigHalManager *hal_manager);

/* Returns the plugins currently known list of connections.  The returned
 * list is freed by the system settings service.
 */
static GSList*
SCPluginIfupdown_get_connections (NMSystemConfigInterface *config);

/*
 * Return a list of HAL UDIs of devices which NetworkManager should not
 * manage.  Returned list will be freed by the system settings service, and
 * each element must be allocated using g_malloc() or its variants.
 */
static GSList*
SCPluginIfupdown_get_unmanaged_devices (NMSystemConfigInterface *config);

/* Signals */

/* Emitted when a new connection has been found by the plugin */
static void 
SCPluginIfupdown_connection_added (NMSystemConfigInterface *config,
							NMExportedConnection *connection);

/* Emitted when the list of unmanaged devices changes */
static void
SCPluginIfupdown_unmanaged_devices_changed (NMSystemConfigInterface *config);

static void
GObject__get_property (GObject *object, guint prop_id,
				   GValue *value, GParamSpec *pspec);

static void
GObject__set_property (GObject *object, guint prop_id,
				   const GValue *value, GParamSpec *pspec);

static void
GObject__dispose (GObject *object);

static void
GObject__finalize (GObject *object);

/* other helpers */
static const char *
get_hostname (NMSystemConfigInterface *config);


static void
update_system_hostname(NMInotifyHelper *inotify_helper,
                       struct inotify_event *evt,
                       const char *path,
                       NMSystemConfigInterface *config);


static void
system_config_interface_init (NMSystemConfigInterface *system_config_interface_class)
{
	system_config_interface_class->init = SCPluginIfupdown_init;
	system_config_interface_class->get_connections = SCPluginIfupdown_get_connections;
	system_config_interface_class->get_unmanaged_devices = SCPluginIfupdown_get_unmanaged_devices;
	system_config_interface_class->connection_added = SCPluginIfupdown_connection_added;
	system_config_interface_class->unmanaged_devices_changed = SCPluginIfupdown_unmanaged_devices_changed;
}

static void
sc_plugin_ifupdown_class_init (SCPluginIfupdownClass *req_class)
{
	GObjectClass *object_class = G_OBJECT_CLASS (req_class);

	g_type_class_add_private (req_class, sizeof (SCPluginIfupdownPrivate));

	object_class->dispose = GObject__dispose;
	object_class->finalize = GObject__finalize;
	object_class->get_property = GObject__get_property;
	object_class->set_property = GObject__set_property;

	g_object_class_override_property (object_class,
	                                  NM_SYSTEM_CONFIG_INTERFACE_PROP_NAME,
	                                  NM_SYSTEM_CONFIG_INTERFACE_NAME);

	g_object_class_override_property (object_class,
	                                  NM_SYSTEM_CONFIG_INTERFACE_PROP_INFO,
	                                  NM_SYSTEM_CONFIG_INTERFACE_INFO);

	g_object_class_override_property (object_class,
	                                  NM_SYSTEM_CONFIG_INTERFACE_PROP_CAPABILITIES,
	                                  NM_SYSTEM_CONFIG_INTERFACE_CAPABILITIES);

	g_object_class_override_property (object_class,
	                                  NM_SYSTEM_CONFIG_INTERFACE_PROP_HOSTNAME,
	                                  NM_SYSTEM_CONFIG_INTERFACE_HOSTNAME);
}

static void
SCPluginIfupdown_init (NMSystemConfigInterface *config,
				   NMSystemConfigHalManager *hal_manager)
{
	SCPluginIfupdownPrivate *priv = SC_PLUGIN_IFUPDOWN_GET_PRIVATE (config);
	GHashTable *auto_ifaces = g_hash_table_new (g_str_hash, g_str_equal);
	if_block *block = NULL;
	NMInotifyHelper *inotify_helper;

	if(!priv->iface_connections)
		priv->iface_connections = g_hash_table_new (g_str_hash, g_str_equal);

	PLUGIN_PRINT("SCPlugin-Ifupdown", "init!");
	priv->hal_mgr = g_object_ref (hal_manager);

	inotify_helper = nm_inotify_helper_get ();
	priv->inotify_event_id = g_signal_connect (inotify_helper,
									   "event",
									   G_CALLBACK (update_system_hostname),
									   config);

	priv->inotify_system_hostname_wd =
		nm_inotify_helper_add_watch (inotify_helper, IFUPDOWN_SYSTEM_HOSTNAME_FILE);

	update_system_hostname(inotify_helper, NULL, NULL, config);

	ifparser_init();
	block = ifparser_getfirst();

	while(block) {
		if(!strcmp("auto", block->type)) {
			g_hash_table_insert (auto_ifaces, block->name, "auto");
		} else if (!strcmp ("iface", block->type) && strcmp ("lo", block->name)) {
			NMExportedConnection *connection = g_hash_table_lookup(priv->iface_connections, block->name);
			g_hash_table_remove (priv->iface_connections, block->name);

			connection = NM_EXPORTED_CONNECTION(nm_ifupdown_connection_new(block));
			ifupdown_update_connection_from_if_block (nm_exported_connection_get_connection(connection),
											  block);

			g_hash_table_insert (priv->iface_connections, block->name, connection);
		}
		block = block -> next;
	}

	{
		GList *keys = g_hash_table_get_keys (priv->iface_connections);
		GList *key_it = keys;
		while(key_it) {
			gpointer val = g_hash_table_lookup(auto_ifaces, key_it->data);
			if(val) {
				NMExportedConnection *connection =
					g_hash_table_lookup(priv->iface_connections, key_it->data);
				NMConnection *wrapped = NULL;
				NMSetting *setting;
				g_object_get(connection,
						   NM_EXPORTED_CONNECTION_CONNECTION, &wrapped, NULL);
				setting = NM_SETTING(nm_connection_get_setting
								 (wrapped, NM_TYPE_SETTING_CONNECTION));
				g_object_set (setting,
						    "autoconnect", TRUE,
						    NULL);
				PLUGIN_PRINT("SCPlugin-Ifupdown", "autoconnect");
			}
			key_it = key_it -> next;
		}
	}
	g_hash_table_unref(auto_ifaces);
	PLUGIN_PRINT("SCPlugin-Ifupdown", "end _init.");
}


/* Returns the plugins currently known list of connections.  The returned
 * list is freed by the system settings service.
 */
static GSList*
SCPluginIfupdown_get_connections (NMSystemConfigInterface *config)
{
	SCPluginIfupdownPrivate *priv = SC_PLUGIN_IFUPDOWN_GET_PRIVATE (config);
	GSList *connections = NULL;
	GList *priv_list = g_hash_table_get_values(priv->iface_connections);
	GList *it = priv_list;
	PLUGIN_PRINT("SCPlugin-Ifupdown", "(%d) ... get_connections.", GPOINTER_TO_UINT(config));

	while(it) {
		NMExportedConnection *conn = it->data;
		connections = g_slist_append(connections, conn);
		it = it->next;
	}
	PLUGIN_PRINT("SCPlugin-Ifupdown", "(%d) connections count: %d", GPOINTER_TO_UINT(config), g_slist_length(connections));
	return connections;
}

/*
 * Return a list of HAL UDIs of devices which NetworkManager should not
 * manage.  Returned list will be freed by the system settings service, and
 * each element must be allocated using g_malloc() or its variants.
 */
static GSList*
SCPluginIfupdown_get_unmanaged_devices (NMSystemConfigInterface *config)
{
	// XXX implement this.
	return NULL;
}

/* Signals */

/* Emitted when a new connection has been found by the plugin */
static void 
SCPluginIfupdown_connection_added (NMSystemConfigInterface *config,
							NMExportedConnection *connection)
{
	PLUGIN_PRINT("SCPlugin-Ifdown", "connection_added ... started");
	g_return_if_fail (config != NULL);
	g_return_if_fail (NM_IS_CONNECTION (connection));
	PLUGIN_PRINT("SCPlugin-Ifdown", "connection_added ... ended");
}

/* Emitted when the list of unmanaged devices changes */
static void
SCPluginIfupdown_unmanaged_devices_changed (NMSystemConfigInterface *config)
{
	PLUGIN_PRINT("SCPlugin-Ifdown", "unmanaged_devices_changed ... started");
	g_return_if_fail (config != NULL);

	PLUGIN_PRINT("SCPlugin-Ifdown", "unmanaged_devices_changed ... ended");
}

static const char *
get_hostname (NMSystemConfigInterface *config)
{
	SCPluginIfupdownPrivate *priv = SC_PLUGIN_IFUPDOWN_GET_PRIVATE (config);
	return priv->hostname;
}

static void
update_system_hostname(NMInotifyHelper *inotify_helper,
                       struct inotify_event *evt,
                       const char *path,
                       NMSystemConfigInterface *config)
{
	SCPluginIfupdownPrivate *priv = SC_PLUGIN_IFUPDOWN_GET_PRIVATE (config);
	gchar *hostname_file = NULL;
	gsize hostname_file_len = 0;
	GError *error = NULL;

	PLUGIN_PRINT ("SCPlugin-Ifupdown", "update_system_hostname");

	if (evt && evt->wd != priv->inotify_system_hostname_wd)
		return;

	if(!g_file_get_contents ( IFUPDOWN_SYSTEM_HOSTNAME_FILE,
						 &hostname_file,
						 &hostname_file_len,
						 &error)) {
		nm_warning ("update_system_hostname() - couldn't read "
				  IFUPDOWN_SYSTEM_HOSTNAME_FILE " (%d/%s)",
				  error->code, error->message);
		return;
	}

	if (priv->hostname)
		g_free(priv->hostname);

	priv->hostname = g_strstrip(hostname_file);

	g_object_notify (G_OBJECT (config), NM_SYSTEM_CONFIG_INTERFACE_HOSTNAME);
}

static void
write_system_hostname(NMSystemConfigInterface *config,
				  const char *newhostname)
{
	GError *error = NULL;
	SCPluginIfupdownPrivate *priv = SC_PLUGIN_IFUPDOWN_GET_PRIVATE (config);
	PLUGIN_PRINT ("SCPlugin-Ifupdown", "write_system_hostname: %s", newhostname);

	g_return_if_fail (newhostname);

	if(!g_file_set_contents ( IFUPDOWN_SYSTEM_HOSTNAME_FILE,
						 newhostname,
						 -1,
						 &error)) {
		nm_warning ("update_system_hostname() - couldn't write hostname (%s) to "
				  IFUPDOWN_SYSTEM_HOSTNAME_FILE " (%d/%s)",
				  newhostname, error->code, error->message);	
	} else {
		priv->hostname = g_strdup (newhostname);
	}
	g_object_notify (G_OBJECT (config), NM_SYSTEM_CONFIG_INTERFACE_HOSTNAME);
}


static void
sc_plugin_ifupdown_init (SCPluginIfupdown *plugin)
{
	SCPluginIfupdownPrivate *priv = SC_PLUGIN_IFUPDOWN_GET_PRIVATE (plugin);
	GError *error = NULL;

	priv->g_connection = dbus_g_bus_get (DBUS_BUS_SYSTEM, &error);
	if (!priv->g_connection) {
		PLUGIN_PRINT ("SCPlugin-Ifupdown", "    dbus-glib error: %s",
		              error->message ? error->message : "(unknown)");
		g_error_free (error);
	}
}

static void
GObject__get_property (GObject *object, guint prop_id,
				   GValue *value, GParamSpec *pspec)
{
	NMSystemConfigInterface *self = NM_SYSTEM_CONFIG_INTERFACE (object);

	switch (prop_id) {
	case NM_SYSTEM_CONFIG_INTERFACE_PROP_NAME:
		g_value_set_string (value, IFUPDOWN_PLUGIN_NAME);
		break;
	case NM_SYSTEM_CONFIG_INTERFACE_PROP_INFO:
		g_value_set_string (value, IFUPDOWN_PLUGIN_INFO);
		break;
	case NM_SYSTEM_CONFIG_INTERFACE_PROP_CAPABILITIES:
		g_value_set_uint (value, NM_SYSTEM_CONFIG_INTERFACE_CAP_MODIFY_HOSTNAME);
		break;
	case NM_SYSTEM_CONFIG_INTERFACE_PROP_HOSTNAME:
		{
			g_value_set_string (value, get_hostname(self));
			break;
		}
	default:
		G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
		break;
	}
}

static void
GObject__set_property (GObject *object, guint prop_id,
				   const GValue *value, GParamSpec *pspec)
{
	switch (prop_id) {
	case NM_SYSTEM_CONFIG_INTERFACE_PROP_HOSTNAME:
		{
			const gchar *hostname = g_value_get_string (value);
			if (hostname && strlen (hostname) < 1)
				hostname = NULL;
			write_system_hostname(NM_SYSTEM_CONFIG_INTERFACE(object),
							  hostname);
			break;
		}
	default:
		G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
		break;
	}
}

static void
GObject__dispose (GObject *object)
{
	SCPluginIfupdown *plugin = SC_PLUGIN_IFUPDOWN (object);
	SCPluginIfupdownPrivate *priv = SC_PLUGIN_IFUPDOWN_GET_PRIVATE (plugin);
	NMInotifyHelper *inotify_helper = nm_inotify_helper_get ();

	g_signal_handler_disconnect (inotify_helper, priv->inotify_event_id);

	if (priv->inotify_system_hostname_wd >= 0)
		nm_inotify_helper_remove_watch (inotify_helper, priv->inotify_system_hostname_wd);

	g_object_unref (priv->hal_mgr);
	G_OBJECT_CLASS (sc_plugin_ifupdown_parent_class)->dispose (object);
}

static void
GObject__finalize (GObject *object)
{
	G_OBJECT_CLASS (sc_plugin_ifupdown_parent_class)->finalize (object);
}

G_MODULE_EXPORT GObject *
nm_system_config_factory (void)
{
	static SCPluginIfupdown *singleton = NULL;

	if (!singleton)
		singleton = SC_PLUGIN_IFUPDOWN (g_object_new (SC_TYPE_PLUGIN_IFUPDOWN, NULL));
	else
		g_object_ref (singleton);

	return G_OBJECT (singleton);
}