libei/src/libei.c

/*
 * Copyright © 2020 Red Hat, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#include "config.h"

#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>


#include "util-io.h"
#include "util-macros.h"
#include "util-object.h"
#include "util-sources.h"
#include "util-strings.h"

#include "libei.h"
#include "libei-private.h"
#include "libei-proto.h"
#include "brei-shared.h"

static struct ei_seat *
ei_find_seat(struct ei *ei, uint32_t seatid)
{
	struct ei_seat *seat;

	list_for_each(seat, &ei->seats, link) {
		if (seat->id == seatid)
			return seat;
	}

	return NULL;
}

static struct ei_device *
ei_find_device(struct ei *ei, uint32_t deviceid)
{
	struct ei_seat *seat;

	list_for_each(seat, &ei->seats, link) {
		struct ei_device *device = ei_seat_find_device(seat, deviceid);
		if (device)
			return device;
	}

	return NULL;
}

static void
ei_destroy(struct ei *ei)
{
	ei_disconnect(ei);

	struct ei_event *e;
	while ((e = ei_get_event(ei)) != NULL)
		ei_event_unref(e);

	if (ei->backend_interface.destroy)
		ei->backend_interface.destroy(ei, ei->backend);
	ei->backend = NULL;
	sink_unref(ei->sink);
	free(ei->name);

	struct ei_property *prop;
	list_for_each_safe(prop, &ei->properties, link) {
		ei_property_unref(prop);
	}
}

static
OBJECT_IMPLEMENT_CREATE(ei);
_public_
OBJECT_IMPLEMENT_REF(ei);
_public_
OBJECT_IMPLEMENT_UNREF(ei);
_public_
OBJECT_IMPLEMENT_SETTER(ei, user_data, void *);
_public_
OBJECT_IMPLEMENT_GETTER(ei, user_data, void *);

DEFINE_UNREF_CLEANUP_FUNC(ei_device);
DEFINE_UNREF_CLEANUP_FUNC(ei_region);

static void
set_prop_cmdline(struct ei *ei)
{
	char path[PATH_MAX];

	xsnprintf(path, sizeof(path), "/proc/%u/cmdline", getpid());
	_cleanup_close_ int fd = open(path, O_RDONLY);
	if (fd < 0)
		return;

	int len;
	if ((len = read(fd, path, sizeof(path) - 1)) < 0)
		return;
	path[len] = '\0';

	ei_property_update(ei, "ei.application.cmdline", path, EI_PROPERTY_PERM_NONE);
}

static void
set_prop_pid(struct ei *ei)
{
	char pid[64];

	xsnprintf(pid, sizeof(pid), "%u", getpid());
	ei_property_update(ei, "ei.application.pid", pid, EI_PROPERTY_PERM_NONE);
}

static void
set_prop_type(struct ei *ei)
{
	ei_property_update(ei, "ei.connection.type", "socket", EI_PROPERTY_PERM_NONE);
}

_public_ struct ei *
ei_new(void *user_data)
{
	_unref_(ei) *ei = ei_create(NULL);

	ei->state = EI_STATE_NEW;
	ei->requests = ei_proto_get_requests();
	list_init(&ei->event_queue);
	list_init(&ei->seats);
	list_init(&ei->properties);

	ei_log_set_handler(ei, NULL);
	ei_log_set_priority(ei, EI_LOG_PRIORITY_INFO);
	ei->sink = sink_new();
	if (!ei->sink)
		return NULL;

	ei->user_data = user_data;
	ei->backend = NULL;

	set_prop_pid(ei);
	set_prop_cmdline(ei);
	set_prop_type(ei);

	return steal(&ei);
}

_public_ int
ei_get_fd(struct ei *ei)
{
	return sink_get_fd(ei->sink);
}

_public_ void
ei_dispatch(struct ei *ei)
{
	sink_dispatch(ei->sink);
}

static void
queue_event(struct ei *ei, struct ei_event *event)
{
	log_debug(ei, "queuing event type %s (%d)\n",
		  ei_event_type_to_string(event->type), event->type);

	list_append(&ei->event_queue, &event->link);
}

static void
insert_event(struct ei *ei, struct ei_event *event)
{
	log_debug(ei, "inserting event type %s (%d)\n",
		  ei_event_type_to_string(event->type), event->type);

	list_insert(&ei->event_queue, &event->link);
}


static void
queue_connect_event(struct ei *ei)
{
	struct ei_event *e = ei_event_new(ei);
	e->type = EI_EVENT_CONNECT;

	queue_event(ei, e);
}

static void
queue_disconnect_event(struct ei *ei)
{
	struct ei_event *e = ei_event_new(ei);
	e->type = EI_EVENT_DISCONNECT;

	queue_event(ei, e);
}

static void
queue_seat_added_event(struct ei_seat *seat)
{
	struct ei *ei= ei_seat_get_context(seat);

	struct ei_event *e = ei_event_new(ei);
	e->type = EI_EVENT_SEAT_ADDED;
	e->seat = ei_seat_ref(seat);

	queue_event(ei, e);
}

static void
queue_seat_removed_event(struct ei_seat *seat)
{
	struct ei *ei= ei_seat_get_context(seat);

	struct ei_event *e = ei_event_new(ei);
	e->type = EI_EVENT_SEAT_REMOVED;
	e->seat = ei_seat_ref(seat);

	queue_event(ei, e);
}

void
ei_queue_seat_removed_event(struct ei_seat *seat)
{
	queue_seat_removed_event(seat);
}

static void
queue_device_added_event(struct ei_device *device)
{
	struct ei *ei= ei_device_get_context(device);

	struct ei_event *e = ei_event_new(ei);
	e->type = EI_EVENT_DEVICE_ADDED;
	e->seat = ei_seat_ref(ei_device_get_seat(device));
	e->device = ei_device_ref(device);

	queue_event(ei, e);
}

static void
queue_device_removed_event(struct ei_device *device)
{
	struct ei *ei= ei_device_get_context(device);

	struct ei_event *e = ei_event_new(ei);
	e->type = EI_EVENT_DEVICE_REMOVED;
	e->seat = ei_seat_ref(ei_device_get_seat(device));
	e->device = ei_device_ref(device);

	queue_event(ei, e);
}

static void
insert_device_removed_event(struct ei_device *device)
{
	struct ei *ei= ei_device_get_context(device);

	struct ei_event *e = ei_event_new(ei);
	e->type = EI_EVENT_DEVICE_REMOVED;
	e->seat = ei_seat_ref(ei_device_get_seat(device));
	e->device = ei_device_ref(device);

	insert_event(ei, e);
}

static void
queue_paused_event(struct ei_device *device)
{
	struct ei *ei= ei_device_get_context(device);

	struct ei_event *e = ei_event_new(ei);
	e->type = EI_EVENT_DEVICE_PAUSED;
	e->seat = ei_seat_ref(ei_device_get_seat(device));
	e->device = ei_device_ref(device);

	queue_event(ei, e);
}

static void
queue_resumed_event(struct ei_device *device)
{
	struct ei *ei= ei_device_get_context(device);

	struct ei_event *e = ei_event_new(ei);
	e->type = EI_EVENT_DEVICE_RESUMED;
	e->seat = ei_seat_ref(ei_device_get_seat(device));
	e->device = ei_device_ref(device);

	queue_event(ei, e);
}

static void
queue_keyboard_modifiers_event(struct ei_device *device,
			       const struct ei_xkb_modifiers *mods)
{
	struct ei *ei= ei_device_get_context(device);

	struct ei_event *e = ei_event_new(ei);
	e->type = EI_EVENT_KEYBOARD_MODIFIERS;
	e->seat = ei_seat_ref(ei_device_get_seat(device));
	e->device = ei_device_ref(device);
	e->modifiers = *mods;

	queue_event(ei, e);
}

static void
queue_property_event(struct ei *ei, const char *name,
		     const char *value, uint32_t permissions)
{
	struct ei_event *e = ei_event_new(ei);
	e->type = EI_EVENT_PROPERTY;
	e->prop.name = xstrdup(name);
	e->prop.value = xstrdup(value);
	e->prop.permissions = permissions;

	queue_event(ei, e);
}

void
ei_disconnect(struct ei *ei)
{
	if (ei->state == EI_STATE_DISCONNECTED ||
	    ei->state == EI_STATE_DISCONNECTING)
		return;

	enum ei_state state = ei->state;

	/* We need the disconnecting state to be re-entrant
	   ei_device_remove() may call ei_disconnect() on a socket error */
	ei->state = EI_STATE_DISCONNECTING;

	struct ei_seat *seat;
	list_for_each_safe(seat, &ei->seats, link) {
		ei_seat_remove(seat);
	}

	if (state != EI_STATE_NEW) {
		ei->requests->disconnect(ei);
	}
	queue_disconnect_event(ei);
	ei->state = EI_STATE_DISCONNECTED;
	if (ei->source)
		source_remove(ei->source);
	ei->source = source_unref(ei->source);
}

static int
handle_msg_seat_added(struct ei *ei, uint32_t seatid,
		      const char *name, uint32_t capabilities)
{
	log_debug(ei, "Added seat %#x '%s' with caps %#x\n",
		  seatid, name, capabilities);

	struct ei_seat *seat = ei_seat_new(ei, seatid, name, capabilities);

	/* seats list owns the ref */
	list_append(&ei->seats, &seat->link);

	queue_seat_added_event(seat);

	return 0;
}

static int
handle_msg_seat_removed(struct ei *ei, uint32_t seatid)
{
	log_debug(ei, "server removed seat %#x\n", seatid);

	struct ei_seat *seat = ei_find_seat(ei, seatid);
	if (seat) {
		ei_seat_remove(seat);
	}

	return 0;
}

static int
handle_msg_device_added(struct ei *ei, uint32_t deviceid, uint32_t seatid,
			const char *name, uint32_t capabilities)
{
	struct ei_seat *seat = ei_find_seat(ei, seatid);

	if (!seat) {
		log_bug(ei, "Invalid seat id %d for device %s (%d)\n",
			seatid, name, deviceid);
		return 0;
	}


	/* Wrong device id or a device already removed by the client but we
	 * won't know which unless we keep some device ID table. Not worth
	 * it, so just silently ignore */
	if (ei_seat_find_device(seat, deviceid)) {
		log_error(ei, "Server sent duplicate device id %#x\n", deviceid);
		return -EINVAL;
	}

	_unref_(ei_device) *device = ei_device_new(seat, deviceid);
	ei_device_set_name(device, name);
	ei_device_set_capabilities(device, capabilities);
	ei_device_added(device);

	log_debug(ei,
		  "Added device %#x '%s' caps: %s%s%s%s seat: %s\n",
		  deviceid, name,
		  ei_device_has_capability(device, EI_DEVICE_CAP_POINTER) ? "p" : "",
		  ei_device_has_capability(device, EI_DEVICE_CAP_POINTER_ABSOLUTE) ? "a" : "",
		  ei_device_has_capability(device, EI_DEVICE_CAP_KEYBOARD) ? "k" : "",
		  ei_device_has_capability(device, EI_DEVICE_CAP_TOUCH) ? "t" : "",
		  ei_seat_get_name(seat));

	return 0;
}

static int
handle_msg_device_keymap(struct ei *ei, uint32_t deviceid,
			enum ei_keymap_type keymap_type,
			int keymap_fd, size_t keymap_sz)
{
	log_debug(ei, "Adding keymap for %#x\n", deviceid);

	struct ei_device *device = ei_find_device(ei, deviceid);
	if (!device)
		return 0;

	ei_device_set_keymap(device, keymap_type, keymap_fd, keymap_sz);

	return 0;
}

void
ei_queue_device_removed_event(struct ei_device *device)
{
	queue_device_removed_event(device);
}

void
ei_insert_device_removed_event(struct ei_device *device)
{
	insert_device_removed_event(device);
}

static int
handle_msg_device_added_done(struct ei *ei, uint32_t deviceid)
{
	log_debug(ei, "Done with device %#x\n", deviceid);

	struct ei_device *device = ei_find_device(ei, deviceid);
	if (!device)
		return 0;

	queue_device_added_event(device);
	ei_device_done(device);

	return 0;
}

static int
handle_msg_device_region(struct ei *ei, uint32_t deviceid,
			 uint32_t x, uint32_t y,
			 uint32_t w, uint32_t h,
			 double scale)
{
	log_debug(ei, "Adding device region for %#x\n", deviceid);

	struct ei_device *device = ei_find_device(ei, deviceid);
	if (!device)
		return 0;

	_unref_(ei_region) *r = ei_region_new();
	ei_region_set_offset(r, x, y);
	ei_region_set_size(r, w, h);
	ei_region_set_physical_scale(r, scale);

	ei_device_add_region(device, r);

	return 0;
}

static int
handle_msg_keyboard_modifiers(struct ei *ei, uint32_t deviceid,
			      uint32_t depressed, uint32_t latched,
			      uint32_t locked, uint32_t group)
{
	log_debug(ei, "Setting modifiers for %#x\n", deviceid);

	struct ei_device *device = ei_find_device(ei, deviceid);
	if (!device)
		return 0;

	if (!ei_device_has_capability(device, EI_DEVICE_CAP_KEYBOARD)) {
		log_bug(ei,"Modifier event for non-keyboard\n");
		return -EPROTO;
	}

	struct ei_xkb_modifiers mods = {
		.depressed = depressed,
		.latched = latched,
		.locked = locked,
		.group = group,
	};
	queue_keyboard_modifiers_event(device, &mods);

	return 0;
}

static int
handle_msg_property(struct ei *ei, const char *name, const char *value,
		    uint32_t permissions)
{
	int rc = ei_property_update(ei, name, value, permissions);
	if (rc == 0)
		queue_property_event(ei, name, value, permissions);

	return 0;
}

static int
handle_msg_device_removed(struct ei *ei, uint32_t deviceid)
{
	log_debug(ei, "Removed device %#x\n", deviceid);

	struct ei_device *device = ei_find_device(ei, deviceid);
	if (!device)
		return 0;

	ei_device_removed_by_server(device);

	return 0;
}

static int
handle_msg_device_resumed(struct ei *ei, uint32_t deviceid)
{
	log_debug(ei, "Resumed device %#x\n", deviceid);

	struct ei_device *device = ei_find_device(ei, deviceid);
	if (device) {
		ei_device_resumed(device);
		queue_resumed_event(device);
	}

	return 0;
}

static int
handle_msg_device_paused(struct ei *ei, uint32_t deviceid)
{
	log_debug(ei, "Paused device %d\n", deviceid);

	struct ei_device *device = ei_find_device(ei, deviceid);
	if (device) {
		ei_device_paused(device);
		queue_paused_event(device);
	}

	return 0;
}

int
ei_send_property(struct ei *ei, const char *name, const char *value, uint32_t permissions)
{
	/* properties before CONNECTED_DONE are handled in a custom way */
	if (ei->state == EI_STATE_NEW || ei->state == EI_STATE_DISCONNECTED)
		return 0;

	int rc = ei->requests->property(ei, name, value, permissions);
	if (rc)
		ei_disconnect(ei);
	return rc;
}

int
ei_send_close_device(struct ei_device *device)
{
	struct ei *ei = ei_device_get_context(device);

	if (ei->state == EI_STATE_NEW || ei->state == EI_STATE_DISCONNECTED)
		return 0;

	int rc = ei->requests->close_device(device);
	if (rc)
		ei_disconnect(ei);
	return rc;
}

int
ei_send_start_emulating(struct ei_device *device)
{
	struct ei *ei = ei_device_get_context(device);

	if (ei->state == EI_STATE_NEW || ei->state == EI_STATE_DISCONNECTED)
		return 0;

	int rc = ei->requests->start_emulating(device);
	if (rc)
		ei_disconnect(ei);
	return rc;
}

int
ei_send_stop_emulating(struct ei_device *device)
{
	struct ei *ei = ei_device_get_context(device);

	if (ei->state == EI_STATE_NEW || ei->state == EI_STATE_DISCONNECTED)
		return 0;

	int rc = ei->requests->stop_emulating(device);
	if (rc)
		ei_disconnect(ei);
	return rc;
}

int
ei_send_seat_bind(struct ei_seat *seat, uint32_t capabilities)
{
	struct ei *ei = ei_seat_get_context(seat);

	if (ei->state == EI_STATE_NEW || ei->state == EI_STATE_DISCONNECTED)
		return 0;

	int rc = ei->requests->bind_seat(seat, capabilities);
	if (rc)
		ei_disconnect(ei);
	return rc;
}

int
ei_send_seat_unbind(struct ei_seat *seat)
{
	struct ei *ei = ei_seat_get_context(seat);

	if (ei->state == EI_STATE_NEW || ei->state == EI_STATE_DISCONNECTED)
		return 0;

	int rc = ei->requests->unbind_seat(seat);
	if (rc)
		ei_disconnect(ei);
	return rc;
}

int
ei_send_frame(struct ei_device *device)
{
	struct ei *ei = ei_device_get_context(device);

	if (ei->state == EI_STATE_NEW || ei->state == EI_STATE_DISCONNECTED)
		return 0;

	int rc = ei->requests->frame(device);
	if (rc)
		ei_disconnect(ei);
	return rc;
}

int
ei_send_pointer_rel(struct ei_device *device, double x, double y)
{
	struct ei *ei = ei_device_get_context(device);

	if (ei->state == EI_STATE_NEW || ei->state == EI_STATE_DISCONNECTED)
		return 0;

	int rc = ei->requests->rel(device, x, y);
	if (rc)
		ei_disconnect(ei);
	return rc;
}

int
ei_send_pointer_abs(struct ei_device *device, double x, double y)
{
	struct ei *ei = ei_device_get_context(device);

	if (ei->state == EI_STATE_NEW || ei->state == EI_STATE_DISCONNECTED)
		return 0;

	int rc = ei->requests->abs(device, x, y);
	if (rc)
		ei_disconnect(ei);
	return rc;
}

int
ei_send_pointer_button(struct ei_device *device, uint32_t button, bool is_press)
{
	struct ei *ei = ei_device_get_context(device);

	if (ei->state == EI_STATE_NEW || ei->state == EI_STATE_DISCONNECTED)
		return 0;

	int rc = ei->requests->button(device, button, is_press);
	if (rc)
		ei_disconnect(ei);
	return rc;
}

int ei_send_pointer_scroll(struct ei_device *device, double x, double y)
{
	struct ei *ei = ei_device_get_context(device);

	if (ei->state == EI_STATE_NEW || ei->state == EI_STATE_DISCONNECTED)
		return 0;

	int rc = ei->requests->scroll(device, x, y);
	if (rc)
		ei_disconnect(ei);
	return rc;
}

int ei_send_pointer_scroll_stop(struct ei_device *device, double x, double y)
{
	struct ei *ei = ei_device_get_context(device);

	if (ei->state == EI_STATE_NEW || ei->state == EI_STATE_DISCONNECTED)
		return 0;

	int rc = ei->requests->scroll_stop(device, x, y);
	if (rc)
		ei_disconnect(ei);
	return rc;
}

int ei_send_pointer_scroll_cancel(struct ei_device *device, double x, double y)
{
	struct ei *ei = ei_device_get_context(device);

	if (ei->state == EI_STATE_NEW || ei->state == EI_STATE_DISCONNECTED)
		return 0;

	int rc = ei->requests->scroll_cancel(device, x, y);
	if (rc)
		ei_disconnect(ei);
	return rc;
}


int ei_send_pointer_scroll_discrete(struct ei_device *device, int32_t x, int32_t y)
{
	struct ei *ei = ei_device_get_context(device);

	if (ei->state == EI_STATE_NEW || ei->state == EI_STATE_DISCONNECTED)
		return 0;

	int rc = ei->requests->scroll_discrete(device, x, y);
	if (rc)
		ei_disconnect(ei);
	return rc;
}

int
ei_send_keyboard_key(struct ei_device *device, uint32_t key, bool is_press)
{
	struct ei *ei = ei_device_get_context(device);

	if (ei->state == EI_STATE_NEW || ei->state == EI_STATE_DISCONNECTED)
		return 0;

	int rc = ei->requests->key(device, key, is_press);
	if (rc)
		ei_disconnect(ei);
	return rc;
}

int
ei_send_touch_down(struct ei_device *device, uint32_t tid,
		   double x, double y)
{
	struct ei *ei = ei_device_get_context(device);

	if (ei->state == EI_STATE_NEW || ei->state == EI_STATE_DISCONNECTED)
		return 0;

	int rc = ei->requests->touch_down(device, tid, x, y);
	if (rc)
		ei_disconnect(ei);
	return rc;
}

int
ei_send_touch_motion(struct ei_device *device, uint32_t tid,
		     double x, double y)
{
	struct ei *ei = ei_device_get_context(device);

	if (ei->state == EI_STATE_NEW || ei->state == EI_STATE_DISCONNECTED)
		return 0;

	int rc = ei->requests->touch_motion(device, tid, x, y);
	if (rc)
		ei_disconnect(ei);
	return rc;
}

int
ei_send_touch_up(struct ei_device *device, uint32_t tid)
{
	struct ei *ei = ei_device_get_context(device);

	if (ei->state == EI_STATE_NEW || ei->state == EI_STATE_DISCONNECTED)
		return 0;

	int rc = ei->requests->touch_up(device, tid);
	if (rc)
		ei_disconnect(ei);
	return rc;
}

_public_ struct ei_event*
ei_get_event(struct ei *ei)
{
	if (list_empty(&ei->event_queue))
		return NULL;

	struct ei_event *e = list_first_entry(&ei->event_queue, e, link);
	list_remove(&e->link);

	return e;
}

_public_ struct ei_event*
ei_peek_event(struct ei *ei)
{
	if (list_empty(&ei->event_queue))
		return NULL;

	struct ei_event *e = list_first_entry(&ei->event_queue, e, link);
	return ei_event_ref(e);
}

static int handle_msg_connected(struct ei *ei) {
	ei->state = EI_STATE_CONNECTED;
	queue_connect_event(ei);
	return 0;
}

static int handle_msg_disconnected(struct ei *ei) {
	return -ECANCELED;
}

static const struct ei_proto_interface intf_state_backend = {
	/* Everything triggers -EPROTO */
	.connected = NULL,
};

static const struct ei_proto_interface intf_state_connecting = {
	.connected = handle_msg_connected,
	.disconnected = handle_msg_disconnected,
};

static const struct ei_proto_interface intf_state_connected = {
	.disconnected = handle_msg_disconnected,
	.seat_added = handle_msg_seat_added,
	.seat_removed = handle_msg_seat_removed,
	.device_added = handle_msg_device_added,
	.device_removed = handle_msg_device_removed,
	.device_resumed = handle_msg_device_resumed,
	.device_paused = handle_msg_device_paused,
	.device_region = handle_msg_device_region,
	.device_keymap = handle_msg_device_keymap,
	.device_done = handle_msg_device_added_done,
	.keyboard_modifiers = handle_msg_keyboard_modifiers,
	.property = handle_msg_property,
};

static const struct ei_proto_interface *interfaces[] = {
	[EI_STATE_NEW] = NULL,
	[EI_STATE_BACKEND] = &intf_state_backend,
	[EI_STATE_CONNECTING] = &intf_state_connecting,
	[EI_STATE_CONNECTED] = &intf_state_connected,
	[EI_STATE_DISCONNECTING] = NULL,
	[EI_STATE_DISCONNECTED] = NULL,
};

static int
connection_message_callback(struct brei_message *bmsg, void *userdata)
{
	struct ei *ei = userdata;

	assert(ei->state < ARRAY_LENGTH(interfaces));
	const struct ei_proto_interface *intf = interfaces[ei->state];

	return ei_proto_handle_message(ei, intf, bmsg);
}

static void
connection_dispatch(struct source *source, void *userdata)
{
	struct ei *ei = userdata;
	enum ei_state old_state = ei->state;

	int rc = brei_dispatch(source_get_fd(source), connection_message_callback, ei);
	if (rc < 0)
		ei_disconnect(ei);

	static const char *states[] = {
		"NEW",
		"BACKEND",
		"CONNECTING",
		"CONNECTED",
		"DISCONNECTED",
		"DISCONNECTING",
	};
	if (rc == -ECANCELED)
		log_info(ei, "Disconnected\n");
	else if (rc)
		log_warn(ei, "Connnection error: %s\n", strerror(-rc));

	if (old_state != ei->state)
		log_debug(ei, "Connnection dispatch: %s -> %s\n",
			  states[old_state],
			  states[ei->state]);
}

int
ei_set_connection(struct ei *ei, int fd)
{
	struct source *source = source_new(fd, connection_dispatch, ei);
	int rc = sink_add_source(ei->sink, source);
	if (rc == 0) {
		ei->source = source_ref(source);
		ei->state = EI_STATE_BACKEND;
		rc = ei->requests->connect(ei);

		struct ei_property *prop;
		list_for_each_safe(prop, &ei->properties, link) {
			if (rc == 0)
				rc = ei->requests->property(ei, prop->name, prop->value, prop->permissions);
		}

		if (rc == 0) {
			rc = ei->requests->connect_done(ei);
		}
		if (rc == 0) {
			ei->state = EI_STATE_CONNECTING;
		}
		if (rc != 0) {
			log_error(ei, "message failed to send: %s\n", strerror(-rc));
			ei_disconnect(ei);
		}
	}

	source_unref(source);

	return rc;
}

_public_ void
ei_configure_name(struct ei *ei, const char *name)
{
	if (ei->state != EI_STATE_NEW) {
		log_bug_client(ei,"Client is already connected\n");
		return;
	}

	if (strlen(name) > 1024) {
		log_bug_client(ei, "Client name too long\n");
		return;
	}

	free(ei->name);
	ei->name = xstrdup(name);
}

#ifdef _enable_tests_
#include "util-munit.h"

MUNIT_TEST(test_init_unref)
{
	struct ei *ei = ei_new(NULL);

	munit_assert_int(ei->state, ==, EI_STATE_NEW);
	munit_assert(list_empty(&ei->event_queue));
	munit_assert(list_empty(&ei->seats));

	munit_assert_not_null(ei->sink);

	struct ei *refd = ei_ref(ei);
	munit_assert_ptr_equal(ei, refd);
	munit_assert_int(ei->object.refcount, ==, 2);

	struct ei *unrefd = ei_unref(ei);
	munit_assert_null(unrefd);

	unrefd = ei_unref(ei);
	munit_assert_null(unrefd);

	return MUNIT_OK;
}

MUNIT_TEST(test_configure_name)
{
	struct ei *ei = ei_new(NULL);

	ei_configure_name(ei, "foo");
	munit_assert_string_equal(ei->name, "foo");
	ei_configure_name(ei, "bar");
	munit_assert_string_equal(ei->name, "bar");

	/* ignore names that are too long */
	char buf[1200] = {0};
	memset(buf, 'a', sizeof(buf) - 1);
	ei_configure_name(ei, buf);
	munit_assert_string_equal(ei->name, "bar");

	/* ignore names in all other states */
	for (enum ei_state state = EI_STATE_NEW + 1;
	     state <= EI_STATE_DISCONNECTED;
	     state++) {
		ei->state = state;
		ei_configure_name(ei, "expect ignored");
		munit_assert_string_equal(ei->name, "bar");
	}

	ei_unref(ei);

	return MUNIT_OK;
}
#endif