proxy.c

BlueZ源码

		*ctrl |= PARODD;
	} else if (strcasecmp("mark", str) == 0)
		*ctrl |= PARENB;
	else if ((strcasecmp("none", str) == 0) ||
			(strcasecmp("space", str) == 0))
		*ctrl &= ~PARENB;
	else
		return -1;

	return 0;
}

static int set_databits(uint8_t databits, tcflag_t *ctrl)
{
	if (databits < 5 || databits > 8)
		return -EINVAL;

	*ctrl &= ~CSIZE;
	switch (databits) {
	case 5:
		*ctrl |= CS5;
		break;
	case 6:
		*ctrl |= CS6;
		break;
	case 7:
		*ctrl |= CS7;
		break;
	case 8:
		*ctrl |= CS8;
		break;
	}

	return 0;
}

static int set_stopbits(uint8_t stopbits, tcflag_t *ctrl)
{
	/* 1.5 will not be allowed */
	switch (stopbits) {
	case 1:
		*ctrl &= ~CSTOPB;
		return 0;
	case 2:
		*ctrl |= CSTOPB;
		return 0;
	}

	return -EINVAL;
}

static DBusMessage *proxy_set_serial_params(DBusConnection *conn,
						DBusMessage *msg, void *data)
{
	struct serial_proxy *prx = data;
	struct serial_adapter *adapter = prx->adapter;
	const char *ratestr, *paritystr;
	uint8_t databits, stopbits;
	tcflag_t ctrl;		/* Control mode flags */
	speed_t speed = B0;	/* In/Out speed */

	/* Don't allow change TTY settings if it is open */
	if (prx->local_watch)
		return failed(msg, "Not allowed");

	if (!dbus_message_get_args(msg, NULL,
				DBUS_TYPE_STRING, &ratestr,
				DBUS_TYPE_BYTE, &databits,
				DBUS_TYPE_BYTE, &stopbits,
				DBUS_TYPE_STRING, &paritystr,
				DBUS_TYPE_INVALID))
		return NULL;

	if (str2speed(ratestr, &speed)  == B0)
		return invalid_arguments(msg, "Invalid baud rate");

	ctrl = prx->proxy_ti.c_cflag;
	if (set_databits(databits, &ctrl) < 0)
		return invalid_arguments(msg, "Invalid data bits");

	if (set_stopbits(stopbits, &ctrl) < 0)
		return invalid_arguments(msg, "Invalid stop bits");

	if (set_parity(paritystr, &ctrl) < 0)
		return invalid_arguments(msg, "Invalid parity");

	prx->proxy_ti.c_cflag = ctrl;
	prx->proxy_ti.c_cflag |= (CLOCAL | CREAD);
	cfsetispeed(&prx->proxy_ti, speed);
	cfsetospeed(&prx->proxy_ti, speed);

	proxy_store(&adapter->src, prx->uuid128, prx->address, NULL,
				prx->channel, 0, &prx->proxy_ti);

	return dbus_message_new_method_return(msg);
}

static GDBusMethodTable proxy_methods[] = {
	{ "Enable",			"",	"",	proxy_enable },
	{ "Disable",			"",	"",	proxy_disable },
	{ "GetInfo",			"",	"a{sv}",proxy_get_info },
	{ "SetSerialParameters",	"syys",	"",	proxy_set_serial_params },
	{ },
};

static void proxy_path_unregister(gpointer data)
{
	struct serial_proxy *prx = data;
	int sk;

	info("Unregistered proxy: %s", prx->address);

	if (prx->type != TTY_PROXY)
		goto done;

	/* Restore the initial TTY configuration */
	sk =  open(prx->address, O_RDWR | O_NOCTTY);
	if (sk) {
		tcsetattr(sk, TCSAFLUSH, &prx->sys_ti);
		close(sk);
	}
done:

	proxy_free(prx);
}

static int register_proxy_object(struct serial_proxy *prx, char *outpath, size_t size)
{
	struct serial_adapter *adapter = prx->adapter;
	char path[MAX_PATH_LENGTH + 1];

	snprintf(path, MAX_PATH_LENGTH, "%s/proxy%d",
			adapter->path, sk_counter++);

	if (!g_dbus_register_interface(adapter->conn, path,
					SERIAL_PROXY_INTERFACE,
					proxy_methods, NULL, NULL,
					prx, proxy_path_unregister)) {
		error("D-Bus failed to register %s path", path);
		return -1;
	}

	prx->path = g_strdup(path);
	adapter->proxies = g_slist_append(adapter->proxies, prx);

	if (outpath)
		strncpy(outpath, path, size);

	info("Registered proxy: %s", path);

	return 0;
}

static int proxy_tty_register(struct serial_adapter *adapter,
				const char *uuid128, const char *address,
				struct termios *ti, char *outpath, size_t size,
				gboolean save)
{
	struct termios sys_ti;
	struct serial_proxy *prx;
	int sk, ret;

	sk = open(address, O_RDONLY | O_NOCTTY);
	if (sk < 0) {
		error("Cant open TTY: %s(%d)", strerror(errno), errno);
		return -EINVAL;
	}

	prx = g_new0(struct serial_proxy, 1);
	prx->address = g_strdup(address);
	prx->uuid128 = g_strdup(uuid128);
	prx->type = TTY_PROXY;
	prx->adapter = adapter;

	/* Current TTY settings */
	memset(&sys_ti, 0, sizeof(sys_ti));
	tcgetattr(sk, &sys_ti);
	memcpy(&prx->sys_ti, &sys_ti, sizeof(sys_ti));
	close(sk);

	if (!ti) {
		/* Use current settings */
		memcpy(&prx->proxy_ti, &sys_ti, sizeof(sys_ti));
	} else {
		/* New TTY settings: user provided */
		memcpy(&prx->proxy_ti, ti, sizeof(*ti));
	}

	ret = register_proxy_object(prx, outpath, size);
	if (ret < 0)
		proxy_free(prx);

	if (save)
		proxy_store(&adapter->src, uuid128, address, NULL,
			prx->channel, 0, &prx->proxy_ti);

	return ret;
}

static int proxy_socket_register(struct serial_adapter *adapter,
				const char *uuid128, const char *address,
				char *outpath, size_t size, gboolean save)
{
	struct serial_proxy *prx;
	int ret;

	prx = g_new0(struct serial_proxy, 1);
	prx->address = g_strdup(address);
	prx->uuid128 = g_strdup(uuid128);
	prx->type = UNIX_SOCKET_PROXY;
	prx->adapter = adapter;

	ret = register_proxy_object(prx, outpath, size);
	if (ret < 0)
		proxy_free(prx);

	if (save)
		proxy_store(&adapter->src, uuid128, address, NULL,
				prx->channel, 0, NULL);

	return ret;
}

static int proxy_tcp_register(struct serial_adapter *adapter,
				const char *uuid128, const char *address,
				char *outpath, size_t size, gboolean save)
{
	struct serial_proxy *prx;
	int ret;

	prx = g_new0(struct serial_proxy, 1);
	prx->address = g_strdup(address);
	prx->uuid128 = g_strdup(uuid128);
	prx->type = TCP_SOCKET_PROXY;
	prx->adapter = adapter;

	ret = register_proxy_object(prx, outpath, size);
	if (ret < 0)
		proxy_free(prx);

	if (save)
		proxy_store(&adapter->src, uuid128, address, NULL,
				prx->channel, 0, NULL);

	return ret;
}

static proxy_type_t addr2type(const char *address)
{
	struct stat st;

	if (stat(address, &st) < 0) {
		/*
		 * Unix socket: if the sun_path starts with null byte
		 * it refers to abstract namespace. 'x00' will be used
		 * to represent the null byte.
		 */
		if (strncmp("localhost:", address, 10) == 0)
			return TCP_SOCKET_PROXY;
		if (strncmp("x00", address, 3) != 0)
			return UNKNOWN_PROXY_TYPE;
		else
			return UNIX_SOCKET_PROXY;
	} else {
		/* Filesystem: char device or unix socket */
		if (S_ISCHR(st.st_mode) && strncmp("/dev/", address, 4) == 0)
			return TTY_PROXY;
		else if (S_ISSOCK(st.st_mode))
			return UNIX_SOCKET_PROXY;
		else
			return UNKNOWN_PROXY_TYPE;
	}
}

static int proxy_addrcmp(gconstpointer proxy, gconstpointer addr)
{
	const struct serial_proxy *prx = proxy;
	const char *address = addr;

	return strcmp(prx->address, address);
}

static int proxy_pathcmp(gconstpointer proxy, gconstpointer p)
{
	const struct serial_proxy *prx = proxy;
	const char *path = p;

	return strcmp(prx->path, path);
}

static DBusMessage *create_proxy(DBusConnection *conn,
				DBusMessage *msg, void *data)
{
	struct serial_adapter *adapter = data;
	char path[MAX_PATH_LENGTH + 1];
	const char *uuid128, *address, *ppath = path;
	DBusMessage *reply;
	proxy_type_t type;
	uuid_t uuid;
	int ret;

	if (!dbus_message_get_args(msg, NULL,
				DBUS_TYPE_STRING, &uuid128,
				DBUS_TYPE_STRING, &address,
				DBUS_TYPE_INVALID))
		return NULL;

	if (bt_string2uuid(&uuid, uuid128) < 0)
		return invalid_arguments(msg, "Invalid UUID");

	type = addr2type(address);
	if (type == UNKNOWN_PROXY_TYPE)
		return invalid_arguments(msg, "Invalid address");

	/* Only one proxy per address(TTY or unix socket) is allowed */
	if (g_slist_find_custom(adapter->proxies, address, proxy_addrcmp))
		return g_dbus_create_error(msg, ERROR_INTERFACE ".AlreadyExist",
						"Proxy already exists");

	reply = dbus_message_new_method_return(msg);
	if (!reply)
		return NULL;

	switch (type) {
	case UNIX_SOCKET_PROXY:
		ret = proxy_socket_register(adapter, uuid128, address,
						path, sizeof(path), TRUE);
		break;
	case TTY_PROXY:
		ret = proxy_tty_register(adapter, uuid128, address,
				NULL, path, sizeof(path), TRUE);
		break;
	case TCP_SOCKET_PROXY:
		ret = proxy_tcp_register(adapter, uuid128, address,
					path, sizeof(path), TRUE);
		break;
	default:
		ret = -1;
	}
	if (ret < 0) {
		dbus_message_unref(reply);
		return failed(msg, "Create object path failed");
	}

	g_dbus_emit_signal(adapter->conn, adapter->path,
			SERIAL_MANAGER_INTERFACE, "ProxyCreated",
			DBUS_TYPE_STRING, &ppath,
			DBUS_TYPE_INVALID);

	dbus_message_append_args(reply,
			DBUS_TYPE_STRING, &ppath,
			DBUS_TYPE_INVALID);

	return reply;
}

static DBusMessage *list_proxies(DBusConnection *conn,
				DBusMessage *msg, void *data)
{
	struct serial_adapter *adapter = data;
	const GSList *l;
	DBusMessage *reply;
	DBusMessageIter iter, iter_array;

	reply = dbus_message_new_method_return(msg);
	if (!reply)
		return NULL;

	dbus_message_iter_init_append(reply, &iter);
	dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY,
			DBUS_TYPE_STRING_AS_STRING, &iter_array);

	for (l = adapter->proxies; l; l = l->next) {
		struct serial_proxy *prx = l->data;

		dbus_message_iter_append_basic(&iter_array,
				DBUS_TYPE_STRING, &prx->path);
	}

	dbus_message_iter_close_container(&iter, &iter_array);

	return reply;
}

static DBusMessage *remove_proxy(DBusConnection *conn,
				DBusMessage *msg, void *data)
{
	struct serial_adapter *adapter = data;
	struct serial_proxy *prx;
	const char *path;
	GSList *l;

	if (!dbus_message_get_args(msg, NULL,
				DBUS_TYPE_STRING, &path,
				DBUS_TYPE_INVALID))
		return NULL;

	l = g_slist_find_custom(adapter->proxies, path, proxy_pathcmp);
	if (!l)
		return does_not_exist(msg, "Invalid proxy path");

	g_dbus_emit_signal(conn, adapter->path,
			SERIAL_MANAGER_INTERFACE, "ProxyRemoved",
			DBUS_TYPE_STRING, &path,
			DBUS_TYPE_INVALID);

	prx = l->data;
	proxy_delete(&adapter->src, prx->address);
	adapter->proxies = g_slist_remove(adapter->proxies, prx);

	g_dbus_unregister_interface(conn, path, SERIAL_PROXY_INTERFACE);

	return dbus_message_new_method_return(msg);
}

static void manager_path_unregister(void *data)
{
	struct serial_adapter *adapter = data;
	GSList *l;

	/* Remove proxy objects */
	for (l = adapter->proxies; l; l = l->next) {
		struct serial_proxy *prx = l->data;
		char *path = g_strdup(prx->path);

		g_dbus_unregister_interface(adapter->conn, path,
					SERIAL_PROXY_INTERFACE);
		g_free(path);
	}

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

	adapters = g_slist_remove(adapters, adapter);
	g_slist_free(adapter->proxies);
	g_free(adapter->path);
	g_free(adapter);
}

static GDBusMethodTable manager_methods[] = {
	{ "CreateProxy",		"ss",	"s",	create_proxy },
	{ "ListProxies",		"",	"as",	list_proxies },
	{ "RemoveProxy",		"s",	"",	remove_proxy },
	{ },
};

static GDBusSignalTable manager_signals[] = {
	{ "ProxyCreated",		"s"	},
	{ "ProxyRemoved",		"s"	},
	{ }
};

static void parse_proxy(char *key, char *value, void *data)
{
	struct serial_adapter *adapter = data;
	char uuid128[MAX_LEN_UUID_STR], tmp[3];
	char *pvalue;
	proxy_type_t type;
	int ch, opts, pos;
	struct termios ti;
	uint8_t *pti;

	memset(uuid128, 0, sizeof(uuid128));
	ch = opts = pos = 0;
	if (sscanf(value,"%s %d 0x%04X %n", uuid128, &ch, &opts, &pos) != 3)
		return;

	/* Extracting name */
	value += pos;
	pvalue = strchr(value, ':');
	if (!pvalue)
		return;

	/* FIXME: currently name is not used */
	*pvalue = '\0';

	type = addr2type(key);
	switch (type) {
	case TTY_PROXY:
		/* Extracting termios */
		pvalue++;
		if (!pvalue || strlen(pvalue) != (2 * sizeof(ti)))
			return;

		memset(&ti, 0, sizeof(ti));
		memset(tmp, 0, sizeof(tmp));

		/* Converting to termios struct */
		pti = (uint8_t *) &ti;
		for (pos = 0; pos < sizeof(ti); pos++, pvalue += 2, pti++) {
			memcpy(tmp, pvalue, 2);
			*pti = (uint8_t) strtol(tmp, NULL, 16);
		}

		proxy_tty_register(adapter, uuid128, key, &ti, NULL, 0, FALSE);
		break;
	case UNIX_SOCKET_PROXY:
		proxy_socket_register(adapter, uuid128, key, NULL, 0, FALSE);
		break;
	case TCP_SOCKET_PROXY:
		proxy_tcp_register(adapter, uuid128, key, NULL, 0, FALSE);
		break;
	default:
		return;
	}
}

static void register_stored(struct serial_adapter *adapter)
{
	char filename[PATH_MAX + 1];
	char address[18];

	ba2str(&adapter->src, address);
	snprintf(filename, PATH_MAX, "%s/%s/proxy", STORAGEDIR, address);
	textfile_foreach(filename, parse_proxy, adapter);
}

static struct serial_adapter *find_adapter(GSList *list, const char *path)
{
	GSList *l;

	for (l = list; l; l = l->next) {
		struct serial_adapter *adapter = l->data;

		if (g_str_equal(adapter->path, path))
			return adapter;
	}

	return NULL;
}

int proxy_register(DBusConnection *conn, const char *path, bdaddr_t *src)
{
	struct serial_adapter *adapter;

	adapter = find_adapter(adapters, path);
	if (adapter)
		return -EINVAL;

	adapter = g_new0(struct serial_adapter, 1);
	adapter->conn = dbus_connection_ref(conn);
	bacpy(&adapter->src, src);
	adapter->path = g_strdup(path);

	if (!g_dbus_register_interface(conn, path,
					SERIAL_MANAGER_INTERFACE,
					manager_methods, manager_signals, NULL,
					adapter, manager_path_unregister)) {
		error("Failed to register %s interface to %s",
				SERIAL_MANAGER_INTERFACE, path);
		return -1;
	}

	register_stored(adapter);

	adapters = g_slist_append(adapters, adapter);

	info("Registered interface %s on path %s",
		SERIAL_MANAGER_INTERFACE, path);

	return 0;
}

void proxy_unregister(const char *path)
{
	struct serial_adapter *adapter;

	adapter = find_adapter(adapters, path);
	if (!adapter)
		return;

	g_dbus_unregister_interface(adapter->conn, path,
			SERIAL_MANAGER_INTERFACE);
}