iwd/src/dbus.c

/*
 *
 *  Wireless daemon for Linux
 *
 *  Copyright (C) 2013-2014  Intel Corporation. All rights reserved.
 *
 *  This library 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 2.1 of the License, or (at your option) any later version.
 *
 *  This library 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
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <unistd.h>
#include <stdio.h>

#include <ell/ell.h>
#include <ell/dbus-private.h>
#include "src/dbus.h"
#include "src/agent.h"

struct l_dbus *g_dbus = 0;
static int kdbus_fd = -1;

static void do_debug(const char *str, void *user_data)
{
	const char *prefix = user_data;

	l_info("%s%s", prefix, str);
}

void dbus_dict_append_string(struct l_dbus_message_builder *builder,
				const char *key, const char *strval)
{
	l_dbus_message_builder_enter_dict(builder, "sv");
	l_dbus_message_builder_append_basic(builder, 's', key);
	l_dbus_message_builder_enter_variant(builder, "s");
	l_dbus_message_builder_append_basic(builder, 's', strval);
	l_dbus_message_builder_leave_variant(builder);
	l_dbus_message_builder_leave_dict(builder);
}

void dbus_dict_append_bool(struct l_dbus_message_builder *builder,
				const char *key, bool boolval)
{
	l_dbus_message_builder_enter_dict(builder, "sv");
	l_dbus_message_builder_append_basic(builder, 's', key);
	l_dbus_message_builder_enter_variant(builder, "b");
	l_dbus_message_builder_append_basic(builder, 'b', &boolval);
	l_dbus_message_builder_leave_variant(builder);
	l_dbus_message_builder_leave_dict(builder);
}

void dbus_dict_append_object(struct l_dbus_message_builder *builder,
				const char *key, const char *object_path)
{
	l_dbus_message_builder_enter_dict(builder, "sv");
	l_dbus_message_builder_append_basic(builder, 's', key);
	l_dbus_message_builder_enter_variant(builder, "o");
	l_dbus_message_builder_append_basic(builder, 'o', object_path);
	l_dbus_message_builder_leave_variant(builder);
	l_dbus_message_builder_leave_dict(builder);
}

void dbus_dict_append_bytearray(struct l_dbus_message_builder *builder,
				const char *key, const uint8_t *arrayval,
				const int len)
{
	int i;

	l_dbus_message_builder_enter_dict(builder, "sv");
	l_dbus_message_builder_append_basic(builder, 's', key);
	l_dbus_message_builder_enter_variant(builder, "ay");
	l_dbus_message_builder_enter_array(builder, "y");

	for (i = 0; i < len; i++)
		l_dbus_message_builder_append_basic(builder, 'y', &arrayval[i]);

	l_dbus_message_builder_leave_array(builder);
	l_dbus_message_builder_leave_variant(builder);
	l_dbus_message_builder_leave_dict(builder);
}

struct l_dbus_message *dbus_error_busy(struct l_dbus_message *msg)
{
	return l_dbus_message_new_error(msg, IWD_SERVICE ".InProgress",
					"Operation already in progress");
}

struct l_dbus_message *dbus_error_failed(struct l_dbus_message *msg)
{
	return l_dbus_message_new_error(msg, IWD_SERVICE ".Failed",
					"Operation failed");
}

struct l_dbus_message *dbus_error_aborted(struct l_dbus_message *msg)
{
	return l_dbus_message_new_error(msg, IWD_SERVICE ".Aborted",
					"Operation aborted");
}

struct l_dbus_message *dbus_error_not_available(struct l_dbus_message *msg)
{
	return l_dbus_message_new_error(msg, IWD_SERVICE ".NotAvailable",
					"Operation not available");
}

struct l_dbus_message *dbus_error_invalid_args(struct l_dbus_message *msg)
{
	return l_dbus_message_new_error(msg, IWD_SERVICE ".InvalidArgs",
					"Argument type is wrong");
}

struct l_dbus_message *dbus_error_already_exists(struct l_dbus_message *msg)
{
	return l_dbus_message_new_error(msg, IWD_SERVICE ".AlreadyExists",
					"Object already exists");
}

struct l_dbus_message *dbus_error_not_found(struct l_dbus_message *msg)
{
	return l_dbus_message_new_error(msg, IWD_SERVICE ".NotFound",
					"Object not found");
}

struct l_dbus_message *dbus_error_not_supported(struct l_dbus_message *msg)
{
	return l_dbus_message_new_error(msg, IWD_SERVICE ".NotSupported",
					"Operation not supported");
}

struct l_dbus_message *dbus_error_no_agent(struct l_dbus_message *msg)
{
	return l_dbus_message_new_error(msg, IWD_SERVICE ".NoAgent",
					"No Agent registered");
}

struct l_dbus_message *dbus_error_not_connected(struct l_dbus_message *msg)
{
	return l_dbus_message_new_error(msg, IWD_SERVICE ".NotConnected",
					"Not connected");
}

struct l_dbus_message *dbus_error_not_implemented(struct l_dbus_message *msg)
{
	return l_dbus_message_new_error(msg, IWD_SERVICE ".NotImplemented",
					"Not implemented");
}

void dbus_pending_reply(struct l_dbus_message **msg,
				struct l_dbus_message *reply)
{
	struct l_dbus *dbus = dbus_get_bus();

	l_dbus_send(dbus, reply);
	l_dbus_message_unref(*msg);
	*msg = NULL;
}

static void request_name_callback(struct l_dbus *dbus, bool success,
					bool queued, void *user_data)
{
	if (!success)
		l_error("Name request failed");
}

static void ready_callback(void *user_data)
{
	l_dbus_name_acquire(g_dbus, "net.connman.iwd", false, false, true,
				request_name_callback, NULL);

	if (!l_dbus_object_manager_enable(g_dbus))
		l_info("Unable to register the ObjectManager");

	agent_init(g_dbus);
}

static void disconnect_callback(void *user_data)
{
	l_info("D-Bus disconnected, quitting...");
	l_main_quit();
}

struct l_dbus *dbus_get_bus(void)
{
	return g_dbus;
}

bool dbus_init(bool enable_debug, bool use_kdbus)
{
	if (!use_kdbus)
		g_dbus = l_dbus_new_default(L_DBUS_SYSTEM_BUS);
	else {
		char bus_name[32], bus_address[64];

		snprintf(bus_name, sizeof(bus_name), "%u-iwd", getuid());

		kdbus_fd = _dbus_kernel_create_bus(bus_name);
		if (kdbus_fd < 0)
			return false;

		snprintf(bus_address, sizeof(bus_address),
				"kernel:path=/dev/kdbus/%s/bus", bus_name);

		l_debug("Bus location: %s", bus_address);

		g_dbus = l_dbus_new(bus_address);

		if (!g_dbus) {
			close(kdbus_fd);
			return false;
		}
	}

	if (enable_debug)
		l_dbus_set_debug(g_dbus, do_debug, "[DBUS] ", NULL);

	l_dbus_set_ready_handler(g_dbus, ready_callback, g_dbus, NULL);
	l_dbus_set_disconnect_handler(g_dbus, disconnect_callback, NULL, NULL);

	return true;
}

bool dbus_exit(void)
{
	agent_exit(g_dbus);

	l_dbus_destroy(g_dbus);
	g_dbus = NULL;

	if (kdbus_fd >= 0)
		close(kdbus_fd);

	return true;
}

void dbus_shutdown(void)
{
	/* Allow AgentManager to send a Release call before disconnecting */
	agent_shutdown();
}