dbus-hci.c

这是Linux环境下的蓝牙源代码

/*
 *
 *  BlueZ - Bluetooth protocol stack for Linux
 *
 *  Copyright (C) 2006-2007  Nokia Corporation
 *  Copyright (C) 2004-2008  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 <gdbus.h>

#include "hcid.h"
#include "textfile.h"
#include "manager.h"
#include "adapter.h"
#include "device.h"
#include "error.h"
#include "glib-helper.h"
#include "dbus-common.h"
#include "agent.h"
#include "dbus-hci.h"

static DBusConnection *connection = NULL;

void bonding_request_free(struct bonding_request_info *bonding)
{
	struct btd_device *device;
	char address[18];
	struct agent *agent;

	if (!bonding)
		return;

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

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

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

	ba2str(&bonding->bdaddr, address);

	device = adapter_find_device(bonding->adapter, address);
	agent = device_get_agent(device);

	if (device && agent) {
		agent_destroy(agent, FALSE);
		device_set_agent(device, NULL);
	}

	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 0x13: /* user ended the connection */
	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 void adapter_mode_changed(struct adapter *adapter, uint8_t scan_mode)
{
	const char *mode;
	const gchar *path = adapter_get_path(adapter);

	adapter_set_scan_mode(adapter, scan_mode);

	switch (scan_mode) {
	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_set_discov_timeout(adapter, adapter->discov_timeout * 1000);

		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_set_discov_timeout(adapter, adapter->discov_timeout * 1000);

		/* ignore, this event should not be sent*/
	default:
		/* ignore, reserved */
		return;
	}

	dbus_connection_emit_property_changed(connection, path,
					ADAPTER_INTERFACE, "Mode",
					DBUS_TYPE_STRING, &mode);
}

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

static void pincode_cb(struct agent *agent, DBusError *err, const char *pincode,
			struct btd_device *device)
{
	struct adapter *adapter = device_get_adapter(device);
	pin_code_reply_cp pr;
	bdaddr_t sba, dba;
	size_t len;
	int dev;
	struct pending_auth_info *auth;
	const gchar *destination = device_get_address(device);
	uint16_t dev_id = adapter_get_dev_id(adapter);
	const gchar *source = adapter_get_address(adapter);

	/* No need to reply anything if the authentication already failed */
	if (adapter->bonding && adapter->bonding->hci_status)
		return;

	dev = hci_open_dev(dev_id);
	if (dev < 0) {
		error("hci_open_dev(%d): %s (%d)", dev_id,
				strerror(errno), errno);
		return;
	}

	str2ba(source, &sba);
	str2ba(destination, &dba);

	auth = adapter_find_auth_request(adapter, &dba);

	if (err) {
		hci_send_cmd(dev, OGF_LINK_CTL,
				OCF_PIN_CODE_NEG_REPLY, 6, &dba);
		goto done;
	}

	len = strlen(pincode);

	set_pin_length(&sba, len);

	memset(&pr, 0, sizeof(pr));
	bacpy(&pr.bdaddr, &dba);
	memcpy(pr.pin_code, pincode, len);
	pr.pin_len = len;
	hci_send_cmd(dev, OGF_LINK_CTL, OCF_PIN_CODE_REPLY, PIN_CODE_REPLY_CP_SIZE, &pr);

done:
	if (auth) {
		auth->replied = TRUE;
		auth->agent = NULL;
	}
	hci_close_dev(dev);
}

int hcid_dbus_request_pin(int dev, bdaddr_t *sba, struct hci_conn_info *ci)
{
	char addr[18];
	struct adapter *adapter;
	struct btd_device *device;
	struct agent *agent = NULL;
	int ret;

	adapter = manager_find_adapter(sba);
	if (!adapter) {
		error("No matching adapter found");
		return -1;
	}

	ba2str(&ci->bdaddr, addr);

	device = adapter_find_device(adapter, addr);

	if (device)
		agent = device_get_agent(device);

	if (!agent)
		agent = adapter->agent;

	if (!agent)
		return -EPERM;

	if (!device) {
		device = adapter_create_device(connection, adapter, addr);
		if (!device)
			return -ENODEV;
	}

	ret = agent_request_pincode(agent, device,
					(agent_pincode_cb) pincode_cb,
					device);
	if (ret == 0) {
		struct pending_auth_info *auth;
		auth = adapter_new_auth_request(adapter, &ci->bdaddr,
						AUTH_TYPE_PINCODE);
		auth->agent = agent;
	}

	return ret;
}

static void confirm_cb(struct agent *agent, DBusError *err, void *user_data)
{
	struct btd_device *device = user_data;
	struct adapter *adapter = device_get_adapter(device);
	user_confirm_reply_cp cp;
	int dd;
	struct pending_auth_info *auth;
	const gchar *destination = device_get_address(device);
	uint16_t dev_id = adapter_get_dev_id(adapter);

	/* No need to reply anything if the authentication already failed */
	if (adapter->bonding && adapter->bonding->hci_status)
		return;

	dd = hci_open_dev(dev_id);
	if (dd < 0) {
		error("Unable to open hci%d", dev_id);
		return;
	}

	memset(&cp, 0, sizeof(cp));
	str2ba(destination, &cp.bdaddr);

	auth = adapter_find_auth_request(adapter, &cp.bdaddr);

	if (err)
		hci_send_cmd(dd, OGF_LINK_CTL, OCF_USER_CONFIRM_NEG_REPLY,
					USER_CONFIRM_REPLY_CP_SIZE, &cp);
	else
		hci_send_cmd(dd, OGF_LINK_CTL, OCF_USER_CONFIRM_REPLY,
					USER_CONFIRM_REPLY_CP_SIZE, &cp);

	if (auth) {
		auth->replied = TRUE;
		auth->agent = FALSE;
	}

	hci_close_dev(dd);
}

static void passkey_cb(struct agent *agent, DBusError *err, uint32_t passkey,
			void *user_data)
{
	struct btd_device *device = user_data;
	struct adapter *adapter = device_get_adapter(device);
	user_passkey_reply_cp cp;
	bdaddr_t dba;
	int dd;
	struct pending_auth_info *auth;
	const gchar *destination = device_get_address(device);
	uint16_t dev_id = adapter_get_dev_id(adapter);

	/* No need to reply anything if the authentication already failed */
	if (adapter->bonding && adapter->bonding->hci_status)
		return;

	dd = hci_open_dev(dev_id);
	if (dd < 0) {
		error("Unable to open hci%d", dev_id);
		return;
	}

	str2ba(destination, &dba);

	memset(&cp, 0, sizeof(cp));
	bacpy(&cp.bdaddr, &dba);
	cp.passkey = passkey;

	auth = adapter_find_auth_request(adapter, &dba);

	if (err)
		hci_send_cmd(dd, OGF_LINK_CTL,
				OCF_USER_PASSKEY_NEG_REPLY, 6, &dba);
	else
		hci_send_cmd(dd, OGF_LINK_CTL, OCF_USER_PASSKEY_REPLY,
					USER_PASSKEY_REPLY_CP_SIZE, &cp);

	if (auth) {
		auth->replied = TRUE;
		auth->agent = NULL;
	}

	hci_close_dev(dd);
}

static int get_auth_requirements(bdaddr_t *local, bdaddr_t *remote,
							uint8_t *auth)
{
	struct hci_auth_info_req req;
	char addr[18];
	int err, dd, dev_id;

	ba2str(local, addr);

	dev_id = hci_devid(addr);