device.c

这是Linux环境下的蓝牙源代码

/*
 *
 *  BlueZ - Bluetooth protocol stack for Linux
 *
 *  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

#include <stdlib.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/socket.h>

#include <bluetooth/bluetooth.h>
#include <bluetooth/hidp.h>
#include <bluetooth/l2cap.h>
#include <bluetooth/rfcomm.h>
#include <bluetooth/sdp.h>

#include <glib.h>
#include <dbus/dbus.h>
#include <gdbus.h>

#include "logging.h"
#include "textfile.h"
#include "uinput.h"

#include "device.h"
#include "error.h"
#include "storage.h"
#include "fakehid.h"
#include "glib-helper.h"

#define INPUT_DEVICE_INTERFACE "org.bluez.input.Device"

#define BUF_SIZE		16

#define UPDOWN_ENABLED		1

#define FI_FLAG_CONNECTED	1

struct input_conn {
	struct fake_input	*fake;
	DBusMessage		*pending_connect;
	char			*uuid;
	char			*alias;
	int			ctrl_sk;
	int			intr_sk;
	guint			ctrl_watch;
	guint			intr_watch;
	int			timeout;
	struct input_device	*idev;
};

struct input_device {
	DBusConnection		*conn;
	char			*path;
	bdaddr_t		src;
	bdaddr_t		dst;
	char			*name;
	GSList			*connections;
};

GSList *devices = NULL;

static struct input_device *find_device_by_path(GSList *list, const char *path)
{
	GSList *l;

	for (l = list; l; l = l->next) {
		struct input_device *idev = l->data;

		if (!strcmp(idev->path, path))
			return idev;
	}

	return NULL;
}

static struct input_conn *find_connection(GSList *list, const char *pattern)
{
	GSList *l;

	for (l = list; l; l = l->next) {
		struct input_conn *iconn = l->data;

		if (!strcasecmp(iconn->uuid, pattern))
			return iconn;

		if (!strcasecmp(iconn->alias, pattern))
			return iconn;
	}

	return NULL;
}

static void input_conn_free(struct input_conn *iconn)
{
	if (iconn->pending_connect)
		dbus_message_unref(iconn->pending_connect);

	if (iconn->ctrl_watch)
		g_source_remove(iconn->ctrl_watch);

	if (iconn->intr_watch)
		g_source_remove(iconn->intr_watch);

	g_free(iconn->uuid);
	g_free(iconn->alias);
	g_free(iconn->fake);
	g_free(iconn);
}

static void input_device_free(struct input_device *idev)
{
	dbus_connection_unref(idev->conn);
	g_free(idev->name);
	g_free(idev->path);
	g_free(idev);
}

static int uinput_create(char *name)
{
	struct uinput_dev dev;
	int fd, err;

	fd = open("/dev/uinput", O_RDWR);
	if (fd < 0) {
		fd = open("/dev/input/uinput", O_RDWR);
		if (fd < 0) {
			fd = open("/dev/misc/uinput", O_RDWR);
			if (fd < 0) {
				err = errno;
				error("Can't open input device: %s (%d)",
							strerror(err), err);
				return -err;
			}
		}
	}

	memset(&dev, 0, sizeof(dev));
	if (name)
		strncpy(dev.name, name, UINPUT_MAX_NAME_SIZE);

	dev.id.bustype = BUS_BLUETOOTH;
	dev.id.vendor  = 0x0000;
	dev.id.product = 0x0000;
	dev.id.version = 0x0000;

	if (write(fd, &dev, sizeof(dev)) < 0) {
		err = errno;
		error("Can't write device information: %s (%d)",
						strerror(err), err);
		close(fd);
		errno = err;
		return -err;
	}

	ioctl(fd, UI_SET_EVBIT, EV_KEY);
	ioctl(fd, UI_SET_EVBIT, EV_REL);
	ioctl(fd, UI_SET_EVBIT, EV_REP);

	ioctl(fd, UI_SET_KEYBIT, KEY_UP);
	ioctl(fd, UI_SET_KEYBIT, KEY_PAGEUP);
	ioctl(fd, UI_SET_KEYBIT, KEY_DOWN);
	ioctl(fd, UI_SET_KEYBIT, KEY_PAGEDOWN);

	if (ioctl(fd, UI_DEV_CREATE, NULL) < 0) {
		err = errno;
		error("Can't create uinput device: %s (%d)",
						strerror(err), err);
		close(fd);
		errno = err;
		return -err;
	}

	return fd;
}

static int decode_key(const char *str)
{
	static int mode = UPDOWN_ENABLED, gain = 0;

	uint16_t key;
	int new_gain;

	/* Switch from key up/down to page up/down */
	if (strncmp("AT+CKPD=200", str, 11) == 0) {
		mode = ~mode;
		return KEY_RESERVED;
	}

	if (strncmp("AT+VG", str, 5))
		return KEY_RESERVED;

	/* Gain key pressed */
	if (strlen(str) != 10)
		return KEY_RESERVED;

	new_gain = strtol(&str[7], NULL, 10);
	if (new_gain <= gain)
		key = (mode == UPDOWN_ENABLED ? KEY_UP : KEY_PAGEUP);
	else
		key = (mode == UPDOWN_ENABLED ? KEY_DOWN : KEY_PAGEDOWN);

	gain = new_gain;

	return key;
}

static void send_event(int fd, uint16_t type, uint16_t code, int32_t value)
{
	struct uinput_event event;
	int err;

	memset(&event, 0, sizeof(event));
	event.type	= type;
	event.code	= code;
	event.value	= value;

	err = write(fd, &event, sizeof(event));
}

static void send_key(int fd, uint16_t key)
{
	/* Key press */
	send_event(fd, EV_KEY, key, 1);
	send_event(fd, EV_SYN, SYN_REPORT, 0);
	/* Key release */
	send_event(fd, EV_KEY, key, 0);
	send_event(fd, EV_SYN, SYN_REPORT, 0);
}

static gboolean rfcomm_io_cb(GIOChannel *chan, GIOCondition cond, gpointer data)
{
	struct fake_input *fake = data;
	const char *ok = "\r\nOK\r\n";
	char buf[BUF_SIZE];
	gsize bread = 0, bwritten;
	uint16_t key;

	if (cond & G_IO_NVAL)
		return FALSE;

	if (cond & (G_IO_HUP | G_IO_ERR)) {
		error("Hangup or error on rfcomm server socket");
		goto failed;
	}

	memset(buf, 0, BUF_SIZE);
	if (g_io_channel_read(chan, buf, sizeof(buf) - 1,
				&bread) != G_IO_ERROR_NONE) {
		error("IO Channel read error");
		goto failed;
	}

	debug("Received: %s", buf);

	if (g_io_channel_write(chan, ok, 6, &bwritten) != G_IO_ERROR_NONE) {
		error("IO Channel write error");
		goto failed;
	}

	key = decode_key(buf);
	if (key != KEY_RESERVED)
		send_key(fake->uinput, key);

	return TRUE;

failed:
	ioctl(fake->uinput, UI_DEV_DESTROY);
	close(fake->uinput);
	fake->uinput = -1;
	g_io_channel_unref(fake->io);

	return FALSE;
}

static inline DBusMessage *not_supported(DBusMessage *msg)
{
	return g_dbus_create_error(msg, ERROR_INTERFACE ".Failed",
							"Not suported");
}

static inline DBusMessage *in_progress(DBusMessage *msg)
{
	return g_dbus_create_error(msg, ERROR_INTERFACE ".InProgress",
				"Device connection already in progress");
}

static inline DBusMessage *already_connected(DBusMessage *msg)
{
	return g_dbus_create_error(msg, ERROR_INTERFACE ".AlreadyConnected",
					"Already connected to a device");
}

static inline DBusMessage *connection_attempt_failed(DBusMessage *msg, int err)
{
	return g_dbus_create_error(msg, ERROR_INTERFACE ".ConnectionAttemptFailed",
				err ? strerror(err) : "Connection attempt failed");
}

static void rfcomm_connect_cb(GIOChannel *chan, int err, const bdaddr_t *src,
			const bdaddr_t *dst, gpointer user_data)
{
	struct input_conn *iconn = user_data;
	struct input_device *idev = iconn->idev;
	struct fake_input *fake = iconn->fake;
	DBusMessage *reply;
	const char *path;

	if (err < 0)
		goto failed;

	fake->rfcomm = g_io_channel_unix_get_fd(chan);

	/*
	 * FIXME: Some headsets required a sco connection
	 * first to report volume gain key events
	 */
	fake->uinput = uinput_create(idev->name);
	if (fake->uinput < 0) {
		err = errno;
		goto failed;
	}

	fake->io = g_io_channel_unix_new(fake->rfcomm);
	g_io_channel_set_close_on_unref(fake->io, TRUE);
	g_io_add_watch(fake->io, G_IO_IN | G_IO_ERR | G_IO_HUP | G_IO_NVAL,
						(GIOFunc) rfcomm_io_cb, fake);

	/* Replying to the requestor */
	reply = dbus_message_new_method_return(iconn->pending_connect);
	g_dbus_send_message(idev->conn, reply);

	/* Sending the Connected signal */
	path = dbus_message_get_path(iconn->pending_connect);
	g_dbus_emit_signal(idev->conn, path,
			INPUT_DEVICE_INTERFACE, "Connected",
			DBUS_TYPE_STRING, &iconn->uuid,
			DBUS_TYPE_INVALID);

	dbus_message_unref(iconn->pending_connect);
	iconn->pending_connect = NULL;

	return;

failed:
	reply = connection_attempt_failed(iconn->pending_connect, err);
	g_dbus_send_message(idev->conn, reply);

	dbus_message_unref(iconn->pending_connect);
	iconn->pending_connect = NULL;
}

static int rfcomm_connect(struct input_conn *iconn)
{
	struct input_device *idev = iconn->idev;
	int err;

	err = bt_rfcomm_connect(&idev->src, &idev->dst, iconn->fake->ch,
			rfcomm_connect_cb, iconn);
	if (err < 0) {
		error("connect() failed: %s (%d)", strerror(-err), -err);
		return err;
	}

	return 0;
}

static gboolean intr_watch_cb(GIOChannel *chan, GIOCondition cond, gpointer data)
{
	struct input_conn *iconn = data;
	struct input_device *idev = iconn->idev;

	if (cond & (G_IO_HUP | G_IO_ERR))
		g_io_channel_close(chan);

	g_dbus_emit_signal(idev->conn, idev->path,
			INPUT_DEVICE_INTERFACE, "Disconnected",
			DBUS_TYPE_STRING, &iconn->uuid,
			DBUS_TYPE_INVALID);

	g_source_remove(iconn->ctrl_watch);
	iconn->ctrl_watch = 0;
	iconn->intr_watch = 0;

	/* Close control channel */
	if (iconn->ctrl_sk > 0) {
		close(iconn->ctrl_sk);
		iconn->ctrl_sk = -1;
	}

	return FALSE;

}

static gboolean ctrl_watch_cb(GIOChannel *chan, GIOCondition cond, gpointer data)
{
	struct input_conn *iconn = data;
	struct input_device *idev = iconn->idev;

	if (cond & (G_IO_HUP | G_IO_ERR))
		g_io_channel_close(chan);

	g_dbus_emit_signal(idev->conn, idev->path, INPUT_DEVICE_INTERFACE,
			"Disconnected", DBUS_TYPE_INVALID);

	g_source_remove(iconn->intr_watch);
	iconn->intr_watch = 0;
	iconn->ctrl_watch = 0;

	/* Close interrupt channel */
	if (iconn->intr_sk > 0) {
		close(iconn->intr_sk);
		iconn->intr_sk = -1;
	}

	return FALSE;
}

static guint create_watch(int sk, GIOFunc cb, struct input_conn *iconn)
{
	guint id;
	GIOChannel *io;

	io = g_io_channel_unix_new(sk);
	id = g_io_add_watch(io, G_IO_HUP | G_IO_ERR | G_IO_NVAL, cb, iconn);
	g_io_channel_unref(io);

	return id;
}

static gboolean fake_hid_connect(struct input_conn *iconn)
{
	struct fake_hid *fhid = iconn->fake->priv;

	return fhid->connect(iconn->fake);
}

static int fake_hid_disconnect(struct input_conn *iconn)
{
	struct fake_hid *fhid = iconn->fake->priv;

	return fhid->disconnect(iconn->fake);
}

static int hidp_connadd(bdaddr_t *src, bdaddr_t *dst,
		int ctrl_sk, int intr_sk, int timeout, const char *name)
{
	struct hidp_connadd_req req;
	struct fake_hid *fake_hid;
	struct fake_input *fake;
	char addr[18];
	int ctl, err;

	memset(&req, 0, sizeof(req));
	req.ctrl_sock = ctrl_sk;
	req.intr_sock = intr_sk;
	req.flags     = 0;
	req.idle_to   = timeout;

	err = get_stored_device_info(src, dst, &req);
	if (err < 0) {
		error("Rejected connection from unknown device %s", addr);
		goto cleanup;
	}

	fake_hid = get_fake_hid(req.vendor, req.product);
	if (fake_hid) {
		fake = g_new0(struct fake_input, 1);
		fake->connect = fake_hid_connect;
		fake->disconnect = fake_hid_disconnect;
		fake->priv = fake_hid;
		return fake_hid_connadd(fake, intr_sk, fake_hid);
	}

	ctl = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HIDP);
	if (ctl < 0) {
		error("Can't open HIDP interface");
		return -errno;
	}

	ba2str(dst, addr);

	if (req.subclass & 0x40) {
		err = encrypt_link(src, dst);
		if (err < 0 && err != -EACCES)
			goto cleanup;
	}

	if (name)
		strncpy(req.name, name, 128);

	if (req.vendor == 0x054c && req.product == 0x0268) {
		unsigned char buf[] = { 0x53, 0xf4,  0x42, 0x03, 0x00, 0x00 };
		err = write(ctrl_sk, buf, sizeof(buf));
	}

	err = ioctl(ctl, HIDPCONNADD, &req);
	if (err < 0) {
		close(ctl);
		goto cleanup;
	}

	info("New input device %s (%s)", addr, req.name);

cleanup:
	if (req.rd_data)
		free(req.rd_data);

	return err;
}

static void interrupt_connect_cb(GIOChannel *chan, int err, const bdaddr_t *src,
			const bdaddr_t *dst, gpointer user_data)
{
	struct input_conn *iconn = user_data;
	struct input_device *idev = iconn->idev;
	DBusMessage *reply;

	if (err < 0) {
		error("connect(): %s (%d)", strerror(-err), -err);
		goto failed;
	}