device.c

BlueZ源码

/*
 *
 *  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/hci.h>
#include <bluetooth/hci_lib.h>
#include <bluetooth/hidp.h>
#include <bluetooth/l2cap.h>
#include <bluetooth/rfcomm.h>
#include <bluetooth/sdp.h>
#include <bluetooth/sdp_lib.h>

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

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

#include "../src/storage.h"
#include "../src/manager.h"
#include "../src/dbus-common.h"
#include "adapter.h"

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

#define INPUT_DEVICE_INTERFACE "org.bluez.Input"

#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;
	uint32_t		handle;
	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_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;
	gboolean connected = FALSE;

	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);
	emit_property_changed(idev->conn, idev->path, INPUT_DEVICE_INTERFACE,
				"Connected", DBUS_TYPE_BOOLEAN, &connected);

	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 void epox_endian_quirk(unsigned char *data, int size)
{
	/* USAGE_PAGE (Keyboard)	05 07
	 * USAGE_MINIMUM (0)		19 00
	 * USAGE_MAXIMUM (65280)	2A 00 FF   <= must be FF 00
	 * LOGICAL_MINIMUM (0)		15 00
	 * LOGICAL_MAXIMUM (65280)	26 00 FF   <= must be FF 00
	 */
	unsigned char pattern[] = { 0x05, 0x07, 0x19, 0x00, 0x2a, 0x00, 0xff,
						0x15, 0x00, 0x26, 0x00, 0xff };
	int i;

	if (!data)
		return;

	for (i = 0; i < size - sizeof(pattern); i++) {
		if (!memcmp(data + i, pattern, sizeof(pattern))) {
			data[i + 5] = 0xff;
			data[i + 6] = 0x00;
			data[i + 10] = 0xff;
			data[i + 11] = 0x00;
		}
	}
}

static void extract_hid_record(sdp_record_t *rec, struct hidp_connadd_req *req)
{
	sdp_data_t *pdlist, *pdlist2;
	uint8_t attr_val;

	pdlist = sdp_data_get(rec, 0x0101);
	pdlist2 = sdp_data_get(rec, 0x0102);
	if (pdlist) {
		if (pdlist2) {
			if (strncmp(pdlist->val.str, pdlist2->val.str, 5)) {
				strncpy(req->name, pdlist2->val.str, 127);
				strcat(req->name, " ");
			}
			strncat(req->name, pdlist->val.str, 127 - strlen(req->name));
		} else
			strncpy(req->name, pdlist->val.str, 127);
	} else {
		pdlist2 = sdp_data_get(rec, 0x0100);
		if (pdlist2)
			strncpy(req->name, pdlist2->val.str, 127);
	}

	pdlist = sdp_data_get(rec, SDP_ATTR_HID_PARSER_VERSION);
	req->parser = pdlist ? pdlist->val.uint16 : 0x0100;

	pdlist = sdp_data_get(rec, SDP_ATTR_HID_DEVICE_SUBCLASS);
	req->subclass = pdlist ? pdlist->val.uint8 : 0;

	pdlist = sdp_data_get(rec, SDP_ATTR_HID_COUNTRY_CODE);
	req->country = pdlist ? pdlist->val.uint8 : 0;

	pdlist = sdp_data_get(rec, SDP_ATTR_HID_VIRTUAL_CABLE);
	attr_val = pdlist ? pdlist->val.uint8 : 0;
	if (attr_val)
		req->flags |= (1 << HIDP_VIRTUAL_CABLE_UNPLUG);

	pdlist = sdp_data_get(rec, SDP_ATTR_HID_BOOT_DEVICE);
	attr_val = pdlist ? pdlist->val.uint8 : 0;
	if (attr_val)
		req->flags |= (1 << HIDP_BOOT_PROTOCOL_MODE);

	pdlist = sdp_data_get(rec, SDP_ATTR_HID_DESCRIPTOR_LIST);
	if (pdlist) {
		pdlist = pdlist->val.dataseq;
		pdlist = pdlist->val.dataseq;
		pdlist = pdlist->next;

		req->rd_data = g_try_malloc0(pdlist->unitSize);
		if (req->rd_data) {
			memcpy(req->rd_data, (unsigned char *) pdlist->val.str,
								pdlist->unitSize);
			req->rd_size = pdlist->unitSize;
			epox_endian_quirk(req->rd_data, req->rd_size);
		}
	}
}

static int ioctl_connadd(struct hidp_connadd_req *req)
{
	int ctl, err = 0;

	ctl = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HIDP);
	if (ctl < 0)
		return -errno;

	if (ioctl(ctl, HIDPCONNADD, req) < 0)
		err = errno;

	close(ctl);

	return -err;
}

static void encrypt_completed(uint8_t status, gpointer user_data)
{
	struct hidp_connadd_req *req = user_data;
	int err;

	if (status) {
		error("Encryption failed: %s(0x%x)",
				strerror(bt_error(status)), status);
		goto failed;
	}

	err = ioctl_connadd(req);
	if (err == 0)
		goto cleanup;

	error("ioctl_connadd(): %s(%d)", strerror(-err), -err);
failed:
	close(req->intr_sock);
	close(req->ctrl_sock);

cleanup:
	if (req->rd_data)
		free(req->rd_data);

	g_free(req);
}

static int hidp_add_connection(const struct input_device *idev,
			       const struct input_conn *iconn)
			       
{
	struct hidp_connadd_req *req;
	struct fake_hid *fake_hid;
	struct fake_input *fake;
	sdp_record_t *rec;
	char src_addr[18], dst_addr[18];
	int err;

	req = g_new0(struct hidp_connadd_req, 1);
	req->ctrl_sock = iconn->ctrl_sk;
	req->intr_sock = iconn->intr_sk;
	req->flags     = 0;
	req->idle_to   = iconn->timeout;

	ba2str(&idev->src, src_addr);
	ba2str(&idev->dst, dst_addr);

	rec = fetch_record(src_addr, dst_addr, idev->handle);
	if (!rec) {
		error("Rejected connection from unknown device %s", dst_addr);
		err = -EPERM;
		goto cleanup;
	}

	extract_hid_record(rec, req);
	sdp_record_free(rec);

	read_device_id(src_addr, dst_addr, NULL,
				&req->vendor, &req->product, &req->version);

	fake_hid = get_fake_hid(req->vendor, req->product);