dbus-hci.c

Linux的蓝牙操作工具。配合bluez-lib使用

/*
 *
 *  BlueZ - Bluetooth protocol stack for Linux
 *
 *  Copyright (C) 2006-2007  Nokia Corporation
 *  Copyright (C) 2004-2007  Marcel Holtmann <[e-mail]>
 *
 *
 *  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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

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

#define _GNU_SOURCE
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/socket.h>

#include <bluetooth/bluetooth.h>
#include <bluetooth/hci.h>
#include <bluetooth/hci_lib.h>
#include <bluetooth/sdp.h>

#include <glib.h>

#include <dbus/dbus.h>

#include "hcid.h"
#include "dbus.h"
#include "textfile.h"
#include "manager.h"
#include "adapter.h"
#include "error.h"
#include "dbus-helper.h"
#include "dbus-common.h"
#include "dbus-error.h"
#include "dbus-test.h"
#include "dbus-service.h"
#include "dbus-security.h"
#include "dbus-hci.h"

static DBusConnection *connection = NULL;

void bonding_request_free(struct bonding_request_info *bonding)
{
	if (!bonding)
		return;

	if (bonding->rq)
		dbus_message_unref(bonding->rq);

	if (bonding->conn)
		dbus_connection_unref(bonding->conn);

	if (bonding->io)
		g_io_channel_unref(bonding->io);

	g_free(bonding);
}

int found_device_cmp(const struct remote_dev_info *d1,
			const struct remote_dev_info *d2)
{
	int ret;

	if (bacmp(&d2->bdaddr, BDADDR_ANY)) {
		ret = bacmp(&d1->bdaddr, &d2->bdaddr);
		if (ret)
			return ret;
	}

	if (d2->name_status != NAME_ANY) {
		ret = (d1->name_status - d2->name_status);
		if (ret)
			return ret;
	}

	return 0;
}

int dev_rssi_cmp(struct remote_dev_info *d1, struct remote_dev_info *d2)
{
	int rssi1, rssi2;

	rssi1 = d1->rssi < 0 ? -d1->rssi : d1->rssi;
	rssi2 = d2->rssi < 0 ? -d2->rssi : d2->rssi;

	return rssi1 - rssi2;
}

int found_device_add(GSList **list, bdaddr_t *bdaddr, int8_t rssi,
			name_status_t name_status)
{
	struct remote_dev_info *dev, match;
	GSList *l;

	memset(&match, 0, sizeof(struct remote_dev_info));
	bacpy(&match.bdaddr, bdaddr);
	match.name_status = NAME_ANY;

	/* ignore repeated entries */
	l = g_slist_find_custom(*list, &match, (GCompareFunc) found_device_cmp);
	if (l) {
		/* device found, update the attributes */
		dev = l->data;

		if (rssi != 0)
			dev->rssi = rssi;

		 /* Get remote name can be received while inquiring.
		  * Keep in mind that multiple inquiry result events can
		  * be received from the same remote device.
		  */
		if (name_status != NAME_NOT_REQUIRED)
			dev->name_status = name_status;

		*list = g_slist_sort(*list, (GCompareFunc) dev_rssi_cmp);

		return -EALREADY;
	}

	dev = g_new0(struct remote_dev_info, 1);

	bacpy(&dev->bdaddr, bdaddr);
	dev->rssi = rssi;
	dev->name_status = name_status;

	*list = g_slist_insert_sorted(*list, dev, (GCompareFunc) dev_rssi_cmp);

	return 0;
}

static int found_device_remove(GSList **list, bdaddr_t *bdaddr)
{
	struct remote_dev_info *dev, match;
	GSList *l;

	memset(&match, 0, sizeof(struct remote_dev_info));
	bacpy(&match.bdaddr, bdaddr);

	l = g_slist_find_custom(*list, &match, (GCompareFunc) found_device_cmp);
	if (!l)
		return -1;

	dev = l->data;
	*list = g_slist_remove(*list, dev);
	g_free(dev);

	return 0;
}

int active_conn_find_by_bdaddr(const void *data, const void *user_data)
{
	const struct active_conn_info *con = data;
	const bdaddr_t *bdaddr = user_data;

	return bacmp(&con->bdaddr, bdaddr);
}

static int active_conn_find_by_handle(const void *data, const void *user_data)
{
	const struct active_conn_info *dev = data;
	const uint16_t *handle = user_data;

	if (dev->handle == *handle)
		return 0;

	return -1;
}

static int active_conn_append(GSList **list, bdaddr_t *bdaddr,
				uint16_t handle)
{
	struct active_conn_info *dev;

	dev = g_new0(struct active_conn_info, 1);

	bacpy(&dev->bdaddr, bdaddr);
	dev->handle = handle;

	*list = g_slist_append(*list, dev);
	return 0;
}

DBusMessage *new_authentication_return(DBusMessage *msg, uint8_t status)
{
	switch (status) {
	case 0x00: /* success */
		return dbus_message_new_method_return(msg);

	case 0x04: /* page timeout */
	case 0x08: /* connection timeout */
	case 0x10: /* connection accept timeout */
	case 0x22: /* LMP response timeout */
	case 0x28: /* instant passed - is this a timeout? */
		return dbus_message_new_error(msg,
					ERROR_INTERFACE ".AuthenticationTimeout",
					"Authentication Timeout");
	case 0x17: /* too frequent pairing attempts */
		return dbus_message_new_error(msg,
					ERROR_INTERFACE ".RepeatedAttempts",
					"Repeated Attempts");

	case 0x06:
	case 0x18: /* pairing not allowed (e.g. gw rejected attempt) */
		return dbus_message_new_error(msg,
					ERROR_INTERFACE ".AuthenticationRejected",
					"Authentication Rejected");

	case 0x07: /* memory capacity */
	case 0x09: /* connection limit */
	case 0x0a: /* synchronous connection limit */
	case 0x0d: /* limited resources */
	case 0x14: /* terminated due to low resources */
		return dbus_message_new_error(msg,
					ERROR_INTERFACE ".AuthenticationCanceled",
					"Authentication Canceled");

	case 0x05: /* authentication failure */
	case 0x0E: /* rejected due to security reasons - is this auth failure? */
	case 0x25: /* encryption mode not acceptable - is this auth failure? */
	case 0x26: /* link key cannot be changed - is this auth failure? */
	case 0x29: /* pairing with unit key unsupported - is this auth failure? */
	case 0x2f: /* insufficient security - is this auth failure? */
	default:
		return dbus_message_new_error(msg,
					ERROR_INTERFACE ".AuthenticationFailed",
					"Authentication Failed");
	}
}

static dbus_bool_t send_adapter_signal(DBusConnection *conn, int devid,
					const char *name, int first, ...)
{
	va_list var_args;
	dbus_bool_t ret;
	char path[MAX_PATH_LENGTH];

	snprintf(path, sizeof(path)-1, "%s/hci%d", BASE_PATH, devid);

	va_start(var_args, first);
	ret = dbus_connection_emit_signal_valist(conn, path, ADAPTER_INTERFACE,
							name, first, var_args);
	va_end(var_args);

	return ret;
}

static void adapter_mode_changed(struct adapter *adapter,
			const char *path, uint8_t scan_enable)
{
	const char *mode;

	adapter->scan_enable = scan_enable;

	switch (scan_enable) {
	case SCAN_DISABLED:
		mode = "off";
		adapter->mode = MODE_OFF;
		break;
	case SCAN_PAGE:
		mode = "connectable";
		adapter->mode = MODE_CONNECTABLE;
		break;
	case (SCAN_PAGE | SCAN_INQUIRY):

		if (adapter->discov_timeout != 0)
			adapter->timeout_id = g_timeout_add(adapter->discov_timeout * 1000,
					discov_timeout_handler, adapter);

		if (adapter->mode == MODE_LIMITED) {
			mode = "limited";
		} else {
			adapter->mode = MODE_DISCOVERABLE;
			mode = "discoverable";
		}
		break;
	case SCAN_INQUIRY:
		/* Address the scenario where another app changed the scan mode */
		if (adapter->discov_timeout != 0)
			adapter->timeout_id = g_timeout_add(adapter->discov_timeout * 1000,
					discov_timeout_handler, adapter);
		/* ignore, this event should not be sent*/
	default:
		/* ignore, reserved */
		return;
	}

	dbus_connection_emit_signal(connection, path, ADAPTER_INTERFACE,
					"ModeChanged",
					DBUS_TYPE_STRING, &mode,
					DBUS_TYPE_INVALID);
}

/*
 * HCI D-Bus services
 */
static void reply_pending_requests(const char *path, struct adapter *adapter)
{
	if (!path || !adapter)
		return;

	/* pending bonding */
	if (adapter->bonding) {
		error_authentication_canceled(connection, adapter->bonding->rq);
		name_listener_remove(connection,
					dbus_message_get_sender(adapter->bonding->rq),
					(name_cb_t) create_bond_req_exit,
					adapter);
		if (adapter->bonding->io_id)
			g_source_remove(adapter->bonding->io_id);
		g_io_channel_close(adapter->bonding->io);
		bonding_request_free(adapter->bonding);
		adapter->bonding = NULL;
	}

	/* If there is a pending reply for discovery cancel */
	if (adapter->discovery_cancel) {
		DBusMessage *reply;
		reply = dbus_message_new_method_return(adapter->discovery_cancel);
		send_message_and_unref(connection, reply);
		dbus_message_unref(adapter->discovery_cancel);
		adapter->discovery_cancel = NULL;
	}

	if (adapter->discov_active) {
		/* Send discovery completed signal if there isn't name
		 * to resolve */
		dbus_connection_emit_signal(connection, path,
						ADAPTER_INTERFACE,
						"DiscoveryCompleted",
						DBUS_TYPE_INVALID);

		/* Cancel inquiry initiated by D-Bus client */
		if (adapter->discov_requestor)
			cancel_discovery(adapter);
	}

	if (adapter->pdiscov_active) {
		/* Send periodic discovery stopped signal exit or stop
		 * the device */
		dbus_connection_emit_signal(connection, path,
						ADAPTER_INTERFACE,
						"PeriodicDiscoveryStopped",
						DBUS_TYPE_INVALID);

		/* Stop periodic inquiry initiated by D-Bus client */
		if (adapter->pdiscov_requestor)
			cancel_periodic_discovery(adapter);
	}
}

int unregister_adapter_path(const char *path)
{
	struct adapter *adapter = NULL;

	info("Unregister path: %s", path);

	dbus_connection_get_object_user_data(connection, path,
						(void *) &adapter);

	if (!adapter)
		goto unreg;

	/* check pending requests */
	reply_pending_requests(path, adapter);

	cancel_passkey_agent_requests(adapter->passkey_agents, path, NULL);

	release_passkey_agents(adapter, NULL);

	if (adapter->discov_requestor) {
		name_listener_remove(connection,
				adapter->discov_requestor,
				(name_cb_t) discover_devices_req_exit, adapter);
		g_free(adapter->discov_requestor);
		adapter->discov_requestor = NULL;
	}

	if (adapter->pdiscov_requestor) {
		name_listener_remove(connection,
				adapter->pdiscov_requestor,
				(name_cb_t) periodic_discover_req_exit,
				adapter);
		g_free(adapter->pdiscov_requestor);
		adapter->pdiscov_requestor = NULL;
	}

	if (adapter->found_devices) {
		g_slist_foreach(adapter->found_devices,
				(GFunc) g_free, NULL);
		g_slist_free(adapter->found_devices);
		adapter->found_devices = NULL;
	}

	if (adapter->oor_devices) {
		g_slist_foreach(adapter->oor_devices,
				(GFunc) free, NULL);
		g_slist_free(adapter->oor_devices);
		adapter->oor_devices = NULL;
	}

	if (adapter->pin_reqs) {
		g_slist_foreach(adapter->pin_reqs,
				(GFunc) g_free, NULL);
		g_slist_free(adapter->pin_reqs);
		adapter->pin_reqs = NULL;
	}

	if (adapter->active_conn) {
		g_slist_foreach(adapter->active_conn,
				(GFunc) free, NULL);
		g_slist_free(adapter->active_conn);
		adapter->active_conn = NULL;
	}

	/* Check if there is a pending RemoteDeviceDisconnect request */
	if (adapter->pending_dc) {
		error_no_such_adapter(adapter->pending_dc->conn,
				      adapter->pending_dc->msg);
		g_source_remove(adapter->pending_dc->timeout_id);
		dc_pending_timeout_cleanup(adapter);
	}

	g_free(adapter);

unreg:
	if (!dbus_connection_destroy_object_path(connection, path)) {
		error("D-Bus failed to unregister %s object", path);
		return -1;
	}

	return 0;
}

/*****************************************************************
 *
 *  Section reserved to HCI commands confirmation handling and low
 *  level events(eg: device attached/dettached.
 *
 *****************************************************************/

int hcid_dbus_register_device(uint16_t id)
{
	char path[MAX_PATH_LENGTH];
	char *pptr = path;
	struct adapter *adapter;

	snprintf(path, sizeof(path), "%s/hci%d", BASE_PATH, id);

	adapter = g_try_new0(struct adapter, 1);
	if (!adapter) {
		error("Failed to alloc memory to D-Bus path register data (%s)",
				path);
		return -1;
	}

	adapter->dev_id = id;
	adapter->pdiscov_resolve_names = 1;

	if (!dbus_connection_create_object_path(connection, path, adapter,
						NULL)) {
		error("D-Bus failed to register %s object", path);
		g_free(adapter);
		return -1;
	}

	if (!adapter_init(connection, path)) {
		error("Adapter interface init failed");
		goto failed;
	}

	if (!security_init(connection, path)) {
		error("Security interface init failed");
		goto failed;
	}

	if (!test_init(connection, path)) {
		error("Test interface init failed");
		goto failed;
	}

	/*
	 * Send the adapter added signal
	 */
	dbus_connection_emit_signal(connection, BASE_PATH, MANAGER_INTERFACE,
					"AdapterAdded",
					DBUS_TYPE_STRING, &pptr,
					DBUS_TYPE_INVALID);

	return 0;

failed:
	dbus_connection_destroy_object_path(connection, path);
	g_free(adapter);

	return -1;
}

int hcid_dbus_unregister_device(uint16_t id)
{
	char path[MAX_PATH_LENGTH];
	char *pptr = path;
	int ret;

	snprintf(path, sizeof(path), "%s/hci%d", BASE_PATH, id);

	dbus_connection_emit_signal(connection, BASE_PATH, MANAGER_INTERFACE,
					"AdapterRemoved",
					DBUS_TYPE_STRING, &pptr,
					DBUS_TYPE_INVALID);

	ret = unregister_adapter_path(path);

	if (ret == 0 && get_default_adapter() == id) {
		int new_default = hci_get_route(NULL);
		set_default_adapter(new_default);
		if (new_default >= 0) {
			snprintf(path, sizeof(path), "%s/hci%d", BASE_PATH,
					new_default);
			dbus_connection_emit_signal(connection, BASE_PATH,
							MANAGER_INTERFACE,
							"DefaultAdapterChanged",
							DBUS_TYPE_STRING, &pptr,
							DBUS_TYPE_INVALID);
		}
	}

	return ret;
}

int hcid_dbus_start_device(uint16_t id)
{
	char path[MAX_PATH_LENGTH];
	struct hci_dev_info di;
	struct adapter* adapter;
	struct hci_conn_list_req *cl = NULL;
	struct hci_conn_info *ci;
	const char *mode;
	int i, err, dd = -1, ret = -1;