dbus.c - chromiumos/platform/frecon - Git at Google

 /*
  * Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 #if DBUS
 #include <dbus/dbus.h>
 #include <stdlib.h>

 #include "dbus.h"
 #include "dbus_interface.h"
 #include "image.h"
 #include "main.h"
 #include "term.h"
 #include "util.h"

 #define COMMAND_MAKE_VT               "MakeVT"
 #define COMMAND_SWITCH_VT             "SwitchVT"
 #define COMMAND_TERMINATE             "Terminate"
 #define COMMAND_IMAGE                 "Image"

 #define DBUS_WAIT_DELAY_US             (50000)
 #define DBUS_DEFAULT_DELAY             3000
 #define DBUS_INIT_TIMEOUT_MS           (60*1000)

 typedef struct _dbus_t dbus_t;

 static void (*login_prompt_visible_callback)(void*) = NULL;
 static void* login_prompt_visible_callback_userptr = NULL;
 static void (*suspend_done_callback)(void*) = NULL;
 static void* suspend_done_callback_userptr = NULL;
 static bool chrome_is_already_up = false;
 static bool dbus_connect_fail = false;
 static int64_t dbus_connect_fail_time;
 static bool dbus_first_init = true;
 static int64_t dbus_first_init_time;

 struct _dbus_t {
 	DBusConnection* conn;
 	DBusWatch* watch;
 	int fd;
 };

 static dbus_t *dbus = NULL;

 static DBusHandlerResult handle_switchvt(DBusConnection* connection,
 					 DBusMessage* message)
 {
 	DBusMessage* reply;
 	DBusMessage* msg;
 	DBusError error;
 	dbus_bool_t stat;
 	terminal_t* terminal;
 	unsigned int vt;

 	dbus_error_init(&error);
 	stat = dbus_message_get_args(message, &error, DBUS_TYPE_UINT32,
 			&vt, DBUS_TYPE_INVALID);

 	if (!stat) {
 		LOG(ERROR, "SwitchVT method error, no VT argument.");
 		return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 	}

 	if (vt > term_get_max_terminals()) {
 		LOG(ERROR, "SwtichVT: invalid terminal.");
 		return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 	}

 	if (vt == 0) {
 		terminal = term_create_term(vt);
 		if (term_is_active(terminal)) {
 			term_deactivate(terminal);
 			msg = dbus_message_new_method_call(
 				kLibCrosServiceName,
 				kLibCrosServicePath,
 				kLibCrosServiceInterface,
 				kTakeDisplayOwnership);
 			dbus_connection_send_with_reply_and_block(connection, msg,
 					DBUS_DEFAULT_DELAY, NULL);
 		}
 		reply = dbus_message_new_method_return(message);
 		dbus_connection_send(connection, reply, NULL);
 		return DBUS_HANDLER_RESULT_HANDLED;
 	} else {
 		/*
 		 * If we are switching to a new term, and if a
 		 * given term is active, then de-activate the
 		 * current terminal
 		 */
 		terminal = term_get_current_terminal();
 		if (term_is_active(terminal))
 			term_deactivate(terminal);

 		terminal = term_create_term(vt);
 		if (term_is_valid(terminal)) {
 			msg = dbus_message_new_method_call(
 				kLibCrosServiceName,
 				kLibCrosServicePath,
 				kLibCrosServiceInterface,
 				kReleaseDisplayOwnership);
 			dbus_connection_send_with_reply_and_block(connection, msg,
 					DBUS_DEFAULT_DELAY, NULL);
 			term_activate(terminal);

 			reply = dbus_message_new_method_return(message);
 			dbus_connection_send(connection, reply, NULL);
 			return DBUS_HANDLER_RESULT_HANDLED;
 		}
 	}

 	return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 }

 static DBusHandlerResult handle_makevt(DBusConnection* connection,
 				       DBusMessage* message)
 {
 	DBusMessage* reply;
 	DBusError error;
 	dbus_bool_t stat;
 	terminal_t* terminal;
 	unsigned int vt;
 	const char* reply_str;

 	dbus_error_init(&error);
 	stat = dbus_message_get_args(message, &error, DBUS_TYPE_UINT32,
 			&vt, DBUS_TYPE_INVALID);

 	if (!stat) {
 		LOG(ERROR, "SwitchVT method error, not VT argument.");
 		return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 	}

 	if ((vt < 1) || (vt > term_get_max_terminals())) {
 		LOG(ERROR, "SwtichVT: invalid terminal.");
 		return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 	}

 	terminal = term_create_term(vt);
 	reply_str = term_get_ptsname(terminal);

 	reply = dbus_message_new_method_return(message);
 	dbus_message_append_args(reply,
 			DBUS_TYPE_STRING, &reply_str,
 			DBUS_TYPE_INVALID);
 	dbus_connection_send(connection, reply, NULL);

 	return DBUS_HANDLER_RESULT_HANDLED;
 }

 static DBusHandlerResult handle_terminate(DBusConnection* connection,
 					  DBusMessage* message)
 {
 	DBusMessage* reply;

 	reply = dbus_message_new_method_return(message);
 	dbus_connection_send(connection, reply, NULL);
 	exit(EXIT_SUCCESS);
 }

 #define NUM_IMAGE_PARAMETERS     (2)
 static DBusHandlerResult handle_image(DBusConnection* connection,
 				      DBusMessage* message)
 {
 	DBusMessage* reply;
 	DBusError error;
 	dbus_bool_t stat;
 	terminal_t* terminal;
 	image_t* image;
 	int i;
 	int x, y;
 	char* option[NUM_IMAGE_PARAMETERS];
 	char* optname;
 	char* optval;
 	int status;

 	dbus_error_init(&error);
 	stat = dbus_message_get_args(message, &error,
 			DBUS_TYPE_STRING, &option[0],
 			DBUS_TYPE_STRING, &option[1],
 			DBUS_TYPE_INVALID);

 	image = image_create();
 	if (image == NULL) {
 		LOG(WARNING, "Failed to create image.");
 		return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 	}

 	if (stat) {
 		for (i = 0; i < NUM_IMAGE_PARAMETERS; i++) {
 			optname = NULL;
 			optval = NULL;
 			parse_image_option(option[i], &optname, &optval);
 			if (strncmp(optname, "image", strlen("image")) == 0) {
 				image_set_filename(image, optval);
 			} else if (strncmp(optname, "location", strlen("location")) == 0) {
 				parse_location(optval, &x, &y);
 				image_set_location(image, x, y);
 			} else if (strncmp(optname, "offset", strlen("offset")) == 0) {
 				parse_location(optval, &x, &y);
 				image_set_offset(image, x, y);
 			}
 			if (optname)
 				free(optname);
 			if (optval)
 				free(optval);
 		}
 	} else {
 		goto fail;
 	}

 	status = image_load_image_from_file(image);
 	if (status != 0) {
 		LOG(WARNING, "image_load_image_from_file(dbus) %s failed: %d:%s.",
 			image_get_filename(image), status, strerror(status));
 		goto fail;
 	}

 	terminal = term_get_current_terminal();
 	if (!terminal)
 		goto fail;

 	status = term_show_image(terminal, image);
 	if (status != 0) {
 		LOG(WARNING, "term_show_image(dbus) failed: %d.", status);
 		goto fail;
 	}
 	image_release(image);

 	reply = dbus_message_new_method_return(message);
 	dbus_connection_send(connection, reply, NULL);

 	return DBUS_HANDLER_RESULT_HANDLED;
 fail:
 	if (image)
 		image_release(image);
 	return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 }

 static void frecon_dbus_unregister(DBusConnection* connection, void* user_data)
 {
 }

 static DBusHandlerResult frecon_dbus_message_handler(DBusConnection* connection,
 						     DBusMessage* message,
 						     void* user_data)
 {
 	if (dbus_message_is_method_call(message,
 				kFreconDbusInterface, COMMAND_SWITCH_VT)) {
 		return handle_switchvt(connection, message);
 	} else if (dbus_message_is_method_call(message,
 				kFreconDbusInterface, COMMAND_MAKE_VT)) {
 		return handle_makevt(connection, message);
 	} else if (dbus_message_is_method_call(message,
 				kFreconDbusInterface, COMMAND_TERMINATE)) {
 		return handle_terminate(connection, message);
 	} else if (dbus_message_is_method_call(message,
 				kFreconDbusInterface, COMMAND_IMAGE)) {
 		return handle_image(connection, message);
 	}

 	return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 }

 static DBusObjectPathVTable
 frecon_vtable = {
 	frecon_dbus_unregister,
 	frecon_dbus_message_handler,
 	NULL
 };

 static dbus_bool_t add_watch(DBusWatch* w, void* data)
 {
 	dbus_t* dbus = (dbus_t*)data;
 	dbus->watch = w;

 	return TRUE;
 }

 static void remove_watch(DBusWatch* w, void* data)
 {
 }

 static void toggle_watch(DBusWatch* w, void* data)
 {
 }

 static DBusHandlerResult handle_login_prompt_visible(DBusMessage* message)
 {
 	if (login_prompt_visible_callback) {
 		login_prompt_visible_callback(login_prompt_visible_callback_userptr);
 		login_prompt_visible_callback = NULL;
 		login_prompt_visible_callback_userptr = NULL;
 	}
 	chrome_is_already_up = true;

 	return DBUS_HANDLER_RESULT_HANDLED;
 }

 static DBusHandlerResult handle_suspend_done(DBusMessage* message)
 {
 	if (suspend_done_callback)
 		suspend_done_callback(suspend_done_callback_userptr);

 	return DBUS_HANDLER_RESULT_HANDLED;
 }

 static DBusHandlerResult frecon_dbus_message_filter(DBusConnection* connection,
 						    DBusMessage* message,
 						    void* user_data)
 {
 	if (dbus_message_is_signal(message,
 				kSessionManagerInterface, kLoginPromptVisibleSignal))
 		return handle_login_prompt_visible(message);
 	else if (dbus_message_is_signal(message,
 				kPowerManagerInterface, kSuspendDoneSignal))
 		return handle_suspend_done(message);

 	return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 }

 bool dbus_is_initialized(void)
 {
 	return !!dbus;
 }

 bool dbus_init()
 {
 	dbus_t* new_dbus;
 	DBusError err;
 	int result;
 	dbus_bool_t stat;

 	if (dbus_first_init) {
 		dbus_first_init = false;
 		dbus_first_init_time = get_monotonic_time_ms();
 	}
 	dbus_error_init(&err);

 	new_dbus = (dbus_t*)calloc(1, sizeof(*new_dbus));

 	if (!new_dbus)
 		return false;

 	new_dbus->fd = -1;

 	new_dbus->conn = dbus_bus_get(DBUS_BUS_SYSTEM, &err);
 	if (dbus_error_is_set(&err)) {
 		if (!dbus_connect_fail) {
 			LOG(ERROR, "Cannot get DBUS connection");
 			dbus_connect_fail = true;
 			dbus_connect_fail_time = get_monotonic_time_ms();
 		}
 		free(new_dbus);
 		return false;
 	}

 	if (dbus_connect_fail) {
 		int64_t t = get_monotonic_time_ms() - dbus_connect_fail_time;
 		LOG(INFO, "DBUS connected after %.1f seconds", (float)t / 1000.0f);
 	}

 	result = dbus_bus_request_name(new_dbus->conn, kFreconDbusInterface,
 			DBUS_NAME_FLAG_DO_NOT_QUEUE, &err);

 	if (result <= 0) {
 		LOG(ERROR, "Unable to get name for server");
 	}

 	stat = dbus_connection_register_object_path(new_dbus->conn,
 			kFreconDbusPath,
 			&frecon_vtable,
 			NULL);

 	if (!stat) {
 		LOG(ERROR, "failed to register object path");
 	}

 	dbus_bus_add_match(new_dbus->conn, kLoginPromptVisibleRule, &err);
 	dbus_bus_add_match(new_dbus->conn, kSuspendDoneRule, &err);

 	stat = dbus_connection_add_filter(new_dbus->conn, frecon_dbus_message_filter, NULL, NULL);
 	if (!stat) {
 		LOG(ERROR, "failed to add message filter");
 	}

 	stat = dbus_connection_set_watch_functions(new_dbus->conn,
 			add_watch, remove_watch, toggle_watch,
 			new_dbus, NULL);

 	if (!stat) {
 		LOG(ERROR, "Failed to set watch functions");
 	}

 	dbus_connection_set_exit_on_disconnect(new_dbus->conn, FALSE);

 	dbus = new_dbus;
 	return true;
 }

 bool dbus_init_wait()
 {
 	while (!dbus_is_initialized()) {
 		if (!dbus_init()) {
 			int64_t t = get_monotonic_time_ms() - dbus_first_init_time;
 			if (t >= DBUS_INIT_TIMEOUT_MS) {
 				LOG(ERROR, "DBUS init failed after a timeout of %u sec", DBUS_INIT_TIMEOUT_MS/1000);
 				return false;
 			}
 		}
 		usleep(DBUS_WAIT_DELAY_US);
 	}
 	return true;
 }

 static bool dbus_method_call0(const char* service_name,
 			      const char* service_path,
 			      const char* service_interface,
 			      const char* method)
 {
 	DBusMessage* msg = NULL;
 	if (!dbus) {
 		LOG(ERROR, "dbus not initialized");
 		return false;
 	}

 	msg = dbus_message_new_method_call(service_name,
 			service_path, service_interface, method);

 	if (!msg)
 		return false;

 	if (!dbus_connection_send_with_reply_and_block(dbus->conn,
 				msg, DBUS_DEFAULT_DELAY, NULL)) {
 		dbus_message_unref(msg);
 		return false;
 	}

 	dbus_connection_flush(dbus->conn);
 	dbus_message_unref(msg);

 	return true;
 }

 static bool dbus_method_call1(const char* service_name,
 			      const char* service_path,
 			      const char* service_interface,
 			      const char* method, int arg_type, void* param)
 {
 	DBusMessage* msg = NULL;
 	if (!dbus) {
 		LOG(ERROR, "dbus not initialized");
 		return false;
 	}

 	msg = dbus_message_new_method_call(service_name,
 			service_path, service_interface, method);

 	if (!msg)
 		return false;

 	if (!dbus_message_append_args(msg,
 				arg_type, param, DBUS_TYPE_INVALID)) {
 		dbus_message_unref(msg);
 		return false;
 	}

 	if (!dbus_connection_send_with_reply_and_block(dbus->conn,
 				msg, DBUS_DEFAULT_DELAY, NULL)) {
 		dbus_message_unref(msg);
 		return false;
 	}

 	dbus_connection_flush(dbus->conn);
 	dbus_message_unref(msg);

 	return true;
 }

 void dbus_destroy(void)
 {
 	/* FIXME - not sure what the right counterpart to
 	 * dbus_bus_get() is, unref documentation is rather
 	 * unclear. Not a big issue but it would be nice to
 	 * clean up properly here
 	 */
 	/* dbus_connection_unref(dbus->conn); */
 	if (dbus) {
 		free(dbus);
 		dbus = NULL;
 	}
 }

 void dbus_add_fds(fd_set* read_set, fd_set* exception_set, int *maxfd)
 {
 	if (!dbus)
 		return;

 	if (dbus->fd < 0)
 		dbus->fd = dbus_watch_get_unix_fd(dbus->watch);

 	if (dbus->fd >= 0) {
 		FD_SET(dbus->fd, read_set);
 		FD_SET(dbus->fd, exception_set);
 	}

 	if (dbus->fd > *maxfd)
 		*maxfd = dbus->fd;
 }

 void dbus_dispatch_io(void)
 {
 	if (!dbus)
 		return;

 	dbus_watch_handle(dbus->watch, DBUS_WATCH_READABLE);
 	while (dbus_connection_get_dispatch_status(dbus->conn)
 			== DBUS_DISPATCH_DATA_REMAINS) {
 		dbus_connection_dispatch(dbus->conn);
 	}
 }

 void dbus_report_user_activity(int activity_type)
 {
 	dbus_bool_t allow_off = false;
 	if (!dbus)
 		return;

 	dbus_method_call1(kPowerManagerServiceName,
 			kPowerManagerServicePath,
 			kPowerManagerInterface,
 			kHandleUserActivityMethod,
 			DBUS_TYPE_INT32, &activity_type);

 	switch (activity_type) {
 		case USER_ACTIVITY_BRIGHTNESS_UP_KEY_PRESS:
 				(void)dbus_method_call0(kPowerManagerServiceName,
 					kPowerManagerServicePath,
 					kPowerManagerInterface,
 					kIncreaseScreenBrightnessMethod);
 				break;
 		case USER_ACTIVITY_BRIGHTNESS_DOWN_KEY_PRESS:
 				/*
 				 * Shouldn't allow the screen to go
 				 * completely off while frecon is active
 				 * so passing false to allow_off
 				 */
 				(void)dbus_method_call1(kPowerManagerServiceName,
 					kPowerManagerServicePath,
 					kPowerManagerInterface,
 					kDecreaseScreenBrightnessMethod,
 					DBUS_TYPE_BOOLEAN, &allow_off);
 				break;
 	}
 }

 /*
  * tell Chrome to take ownership of the display (DRM master)
  */
 void dbus_take_display_ownership(void)
 {
 	if (!dbus)
 		return;
 	(void)dbus_method_call0(kLibCrosServiceName,
 				kLibCrosServicePath,
 				kLibCrosServiceInterface,
 				kTakeDisplayOwnership);
 }

 /*
  * ask Chrome to give up display ownership (DRM master)
  */
 bool dbus_release_display_ownership(void)
 {
 	if (!dbus)
 		return true;
 	return dbus_method_call0(kLibCrosServiceName,
 				 kLibCrosServicePath,
 				 kLibCrosServiceInterface,
 				 kReleaseDisplayOwnership);
 }

 void dbus_set_login_prompt_visible_callback(void (*callback)(void*),
 					    void* userptr)
 {
 	if (chrome_is_already_up) {
 		if (callback)
 			callback(userptr);
 	} else {
 		if (login_prompt_visible_callback && callback) {
 			LOG(ERROR, "trying to register login prompt visible callback multiple times");
 			return;
 		}
 		login_prompt_visible_callback = callback;
 		login_prompt_visible_callback_userptr = userptr;
 	}
 }

 void dbus_set_suspend_done_callback(void (*callback)(void*),
 				    void* userptr)
 {
 	if (suspend_done_callback && callback) {
 		LOG(ERROR, "trying to register login prompt visible callback multiple times");
 		return;
 	}
 	suspend_done_callback = callback;
 	suspend_done_callback_userptr = userptr;
 }

 #else

 #include <stdlib.h>
 #include <stdbool.h>

 bool dbus_init()
 {
 	return true;
 }

 bool dbus_init_wait()
 {
 	return true;
 }

 void dbus_destroy(void)
 {
 }

 void dbus_add_fds(fd_set* read_set, fd_set* exception_set, int *maxfd)
 {
 }

 void dbus_dispatch_io(void)
 {
 }

 void dbus_report_user_activity(int activity_type)
 {
 }

 void dbus_take_display_ownership(void)
 {
 }

 bool dbus_release_display_ownership(void)
 {
 	return true;
 }

 bool dbus_is_initialized(void)
 {
 	return true;
 }

 void dbus_set_login_prompt_visible_callback(void (*callback)(void*),
 					    void* userptr)
 {
 }

 void dbus_set_suspend_done_callback(void (*callback)(void*),
 				    void* userptr)
 {
 }

 #endif
	/*
	* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	#if DBUS
	#include <dbus/dbus.h>
	#include <stdlib.h>

	#include "dbus.h"
	#include "dbus_interface.h"
	#include "image.h"
	#include "main.h"
	#include "term.h"
	#include "util.h"

	#define COMMAND_MAKE_VT "MakeVT"
	#define COMMAND_SWITCH_VT "SwitchVT"
	#define COMMAND_TERMINATE "Terminate"
	#define COMMAND_IMAGE "Image"

	#define DBUS_WAIT_DELAY_US (50000)
	#define DBUS_DEFAULT_DELAY 3000
	#define DBUS_INIT_TIMEOUT_MS (60*1000)

	typedef struct _dbus_t dbus_t;

	static void (login_prompt_visible_callback)(void) = NULL;
	static void* login_prompt_visible_callback_userptr = NULL;
	static void (suspend_done_callback)(void) = NULL;
	static void* suspend_done_callback_userptr = NULL;
	static bool chrome_is_already_up = false;
	static bool dbus_connect_fail = false;
	static int64_t dbus_connect_fail_time;
	static bool dbus_first_init = true;
	static int64_t dbus_first_init_time;

	struct _dbus_t {
	DBusConnection* conn;
	DBusWatch* watch;
	int fd;
	};

	static dbus_t *dbus = NULL;

	static DBusHandlerResult handle_switchvt(DBusConnection* connection,
	DBusMessage* message)
	{
	DBusMessage* reply;
	DBusMessage* msg;
	DBusError error;
	dbus_bool_t stat;
	terminal_t* terminal;
	unsigned int vt;

	dbus_error_init(&error);
	stat = dbus_message_get_args(message, &error, DBUS_TYPE_UINT32,
	&vt, DBUS_TYPE_INVALID);

	if (!stat) {
	LOG(ERROR, "SwitchVT method error, no VT argument.");
	return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
	}

	if (vt > term_get_max_terminals()) {
	LOG(ERROR, "SwtichVT: invalid terminal.");
	return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
	}

	if (vt == 0) {
	terminal = term_create_term(vt);
	if (term_is_active(terminal)) {
	term_deactivate(terminal);
	msg = dbus_message_new_method_call(
	kLibCrosServiceName,
	kLibCrosServicePath,
	kLibCrosServiceInterface,
	kTakeDisplayOwnership);
	dbus_connection_send_with_reply_and_block(connection, msg,
	DBUS_DEFAULT_DELAY, NULL);
	}
	reply = dbus_message_new_method_return(message);
	dbus_connection_send(connection, reply, NULL);
	return DBUS_HANDLER_RESULT_HANDLED;
	} else {
	/*
	* If we are switching to a new term, and if a
	* given term is active, then de-activate the
	* current terminal
	*/
	terminal = term_get_current_terminal();
	if (term_is_active(terminal))
	term_deactivate(terminal);

	terminal = term_create_term(vt);
	if (term_is_valid(terminal)) {
	msg = dbus_message_new_method_call(
	kLibCrosServiceName,
	kLibCrosServicePath,
	kLibCrosServiceInterface,
	kReleaseDisplayOwnership);
	dbus_connection_send_with_reply_and_block(connection, msg,
	DBUS_DEFAULT_DELAY, NULL);
	term_activate(terminal);

	reply = dbus_message_new_method_return(message);
	dbus_connection_send(connection, reply, NULL);
	return DBUS_HANDLER_RESULT_HANDLED;
	}
	}

	return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
	}

	static DBusHandlerResult handle_makevt(DBusConnection* connection,
	DBusMessage* message)
	{
	DBusMessage* reply;
	DBusError error;
	dbus_bool_t stat;
	terminal_t* terminal;
	unsigned int vt;
	const char* reply_str;

	dbus_error_init(&error);
	stat = dbus_message_get_args(message, &error, DBUS_TYPE_UINT32,
	&vt, DBUS_TYPE_INVALID);

	if (!stat) {
	LOG(ERROR, "SwitchVT method error, not VT argument.");
	return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
	}

	if ((vt < 1) \|\| (vt > term_get_max_terminals())) {
	LOG(ERROR, "SwtichVT: invalid terminal.");
	return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
	}

	terminal = term_create_term(vt);
	reply_str = term_get_ptsname(terminal);

	reply = dbus_message_new_method_return(message);
	dbus_message_append_args(reply,
	DBUS_TYPE_STRING, &reply_str,
	DBUS_TYPE_INVALID);
	dbus_connection_send(connection, reply, NULL);

	return DBUS_HANDLER_RESULT_HANDLED;
	}

	static DBusHandlerResult handle_terminate(DBusConnection* connection,
	DBusMessage* message)
	{
	DBusMessage* reply;

	reply = dbus_message_new_method_return(message);
	dbus_connection_send(connection, reply, NULL);
	exit(EXIT_SUCCESS);
	}

	#define NUM_IMAGE_PARAMETERS (2)
	static DBusHandlerResult handle_image(DBusConnection* connection,
	DBusMessage* message)
	{
	DBusMessage* reply;
	DBusError error;
	dbus_bool_t stat;
	terminal_t* terminal;
	image_t* image;
	int i;
	int x, y;
	char* option[NUM_IMAGE_PARAMETERS];
	char* optname;
	char* optval;
	int status;

	dbus_error_init(&error);
	stat = dbus_message_get_args(message, &error,
	DBUS_TYPE_STRING, &option[0],
	DBUS_TYPE_STRING, &option[1],
	DBUS_TYPE_INVALID);

	image = image_create();
	if (image == NULL) {
	LOG(WARNING, "Failed to create image.");
	return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
	}

	if (stat) {
	for (i = 0; i < NUM_IMAGE_PARAMETERS; i++) {
	optname = NULL;
	optval = NULL;
	parse_image_option(option[i], &optname, &optval);
	if (strncmp(optname, "image", strlen("image")) == 0) {
	image_set_filename(image, optval);
	} else if (strncmp(optname, "location", strlen("location")) == 0) {
	parse_location(optval, &x, &y);
	image_set_location(image, x, y);
	} else if (strncmp(optname, "offset", strlen("offset")) == 0) {
	parse_location(optval, &x, &y);
	image_set_offset(image, x, y);
	}
	if (optname)
	free(optname);
	if (optval)
	free(optval);
	}
	} else {
	goto fail;
	}

	status = image_load_image_from_file(image);
	if (status != 0) {
	LOG(WARNING, "image_load_image_from_file(dbus) %s failed: %d:%s.",
	image_get_filename(image), status, strerror(status));
	goto fail;
	}

	terminal = term_get_current_terminal();
	if (!terminal)
	goto fail;

	status = term_show_image(terminal, image);
	if (status != 0) {
	LOG(WARNING, "term_show_image(dbus) failed: %d.", status);
	goto fail;
	}
	image_release(image);

	reply = dbus_message_new_method_return(message);
	dbus_connection_send(connection, reply, NULL);

	return DBUS_HANDLER_RESULT_HANDLED;
	fail:
	if (image)
	image_release(image);
	return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
	}

	static void frecon_dbus_unregister(DBusConnection* connection, void* user_data)
	{
	}

	static DBusHandlerResult frecon_dbus_message_handler(DBusConnection* connection,
	DBusMessage* message,
	void* user_data)
	{
	if (dbus_message_is_method_call(message,
	kFreconDbusInterface, COMMAND_SWITCH_VT)) {
	return handle_switchvt(connection, message);
	} else if (dbus_message_is_method_call(message,
	kFreconDbusInterface, COMMAND_MAKE_VT)) {
	return handle_makevt(connection, message);
	} else if (dbus_message_is_method_call(message,
	kFreconDbusInterface, COMMAND_TERMINATE)) {
	return handle_terminate(connection, message);
	} else if (dbus_message_is_method_call(message,
	kFreconDbusInterface, COMMAND_IMAGE)) {
	return handle_image(connection, message);
	}

	return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
	}

	static DBusObjectPathVTable
	frecon_vtable = {
	frecon_dbus_unregister,
	frecon_dbus_message_handler,
	NULL
	};

	static dbus_bool_t add_watch(DBusWatch* w, void* data)
	{
	dbus_t* dbus = (dbus_t*)data;
	dbus->watch = w;

	return TRUE;
	}

	static void remove_watch(DBusWatch* w, void* data)
	{
	}

	static void toggle_watch(DBusWatch* w, void* data)
	{
	}

	static DBusHandlerResult handle_login_prompt_visible(DBusMessage* message)
	{
	if (login_prompt_visible_callback) {
	login_prompt_visible_callback(login_prompt_visible_callback_userptr);
	login_prompt_visible_callback = NULL;
	login_prompt_visible_callback_userptr = NULL;
	}
	chrome_is_already_up = true;

	return DBUS_HANDLER_RESULT_HANDLED;
	}

	static DBusHandlerResult handle_suspend_done(DBusMessage* message)
	{
	if (suspend_done_callback)
	suspend_done_callback(suspend_done_callback_userptr);

	return DBUS_HANDLER_RESULT_HANDLED;
	}

	static DBusHandlerResult frecon_dbus_message_filter(DBusConnection* connection,
	DBusMessage* message,
	void* user_data)
	{
	if (dbus_message_is_signal(message,
	kSessionManagerInterface, kLoginPromptVisibleSignal))
	return handle_login_prompt_visible(message);
	else if (dbus_message_is_signal(message,
	kPowerManagerInterface, kSuspendDoneSignal))
	return handle_suspend_done(message);

	return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
	}

	bool dbus_is_initialized(void)
	{
	return !!dbus;
	}

	bool dbus_init()
	{
	dbus_t* new_dbus;
	DBusError err;
	int result;
	dbus_bool_t stat;

	if (dbus_first_init) {
	dbus_first_init = false;
	dbus_first_init_time = get_monotonic_time_ms();
	}
	dbus_error_init(&err);

	new_dbus = (dbus_t)calloc(1, sizeof(new_dbus));

	if (!new_dbus)
	return false;

	new_dbus->fd = -1;

	new_dbus->conn = dbus_bus_get(DBUS_BUS_SYSTEM, &err);
	if (dbus_error_is_set(&err)) {
	if (!dbus_connect_fail) {
	LOG(ERROR, "Cannot get DBUS connection");
	dbus_connect_fail = true;
	dbus_connect_fail_time = get_monotonic_time_ms();
	}
	free(new_dbus);
	return false;
	}

	if (dbus_connect_fail) {
	int64_t t = get_monotonic_time_ms() - dbus_connect_fail_time;
	LOG(INFO, "DBUS connected after %.1f seconds", (float)t / 1000.0f);
	}

	result = dbus_bus_request_name(new_dbus->conn, kFreconDbusInterface,
	DBUS_NAME_FLAG_DO_NOT_QUEUE, &err);

	if (result <= 0) {
	LOG(ERROR, "Unable to get name for server");
	}

	stat = dbus_connection_register_object_path(new_dbus->conn,
	kFreconDbusPath,
	&frecon_vtable,
	NULL);

	if (!stat) {
	LOG(ERROR, "failed to register object path");
	}

	dbus_bus_add_match(new_dbus->conn, kLoginPromptVisibleRule, &err);
	dbus_bus_add_match(new_dbus->conn, kSuspendDoneRule, &err);

	stat = dbus_connection_add_filter(new_dbus->conn, frecon_dbus_message_filter, NULL, NULL);
	if (!stat) {
	LOG(ERROR, "failed to add message filter");
	}

	stat = dbus_connection_set_watch_functions(new_dbus->conn,
	add_watch, remove_watch, toggle_watch,
	new_dbus, NULL);

	if (!stat) {
	LOG(ERROR, "Failed to set watch functions");
	}

	dbus_connection_set_exit_on_disconnect(new_dbus->conn, FALSE);

	dbus = new_dbus;
	return true;
	}

	bool dbus_init_wait()
	{
	while (!dbus_is_initialized()) {
	if (!dbus_init()) {
	int64_t t = get_monotonic_time_ms() - dbus_first_init_time;
	if (t >= DBUS_INIT_TIMEOUT_MS) {
	LOG(ERROR, "DBUS init failed after a timeout of %u sec", DBUS_INIT_TIMEOUT_MS/1000);
	return false;
	}
	}
	usleep(DBUS_WAIT_DELAY_US);
	}
	return true;
	}

	static bool dbus_method_call0(const char* service_name,
	const char* service_path,
	const char* service_interface,
	const char* method)
	{
	DBusMessage* msg = NULL;
	if (!dbus) {
	LOG(ERROR, "dbus not initialized");
	return false;
	}

	msg = dbus_message_new_method_call(service_name,
	service_path, service_interface, method);

	if (!msg)
	return false;

	if (!dbus_connection_send_with_reply_and_block(dbus->conn,
	msg, DBUS_DEFAULT_DELAY, NULL)) {
	dbus_message_unref(msg);
	return false;
	}

	dbus_connection_flush(dbus->conn);
	dbus_message_unref(msg);

	return true;
	}

	static bool dbus_method_call1(const char* service_name,
	const char* service_path,
	const char* service_interface,
	const char* method, int arg_type, void* param)
	{
	DBusMessage* msg = NULL;
	if (!dbus) {
	LOG(ERROR, "dbus not initialized");
	return false;
	}

	msg = dbus_message_new_method_call(service_name,
	service_path, service_interface, method);

	if (!msg)
	return false;

	if (!dbus_message_append_args(msg,
	arg_type, param, DBUS_TYPE_INVALID)) {
	dbus_message_unref(msg);
	return false;
	}

	if (!dbus_connection_send_with_reply_and_block(dbus->conn,
	msg, DBUS_DEFAULT_DELAY, NULL)) {
	dbus_message_unref(msg);
	return false;
	}

	dbus_connection_flush(dbus->conn);
	dbus_message_unref(msg);

	return true;
	}

	void dbus_destroy(void)
	{
	/* FIXME - not sure what the right counterpart to
	* dbus_bus_get() is, unref documentation is rather
	* unclear. Not a big issue but it would be nice to
	* clean up properly here
	*/
	/* dbus_connection_unref(dbus->conn); */
	if (dbus) {
	free(dbus);
	dbus = NULL;
	}
	}

	void dbus_add_fds(fd_set* read_set, fd_set* exception_set, int *maxfd)
	{
	if (!dbus)
	return;

	if (dbus->fd < 0)
	dbus->fd = dbus_watch_get_unix_fd(dbus->watch);

	if (dbus->fd >= 0) {
	FD_SET(dbus->fd, read_set);
	FD_SET(dbus->fd, exception_set);
	}

	if (dbus->fd > *maxfd)
	*maxfd = dbus->fd;
	}

	void dbus_dispatch_io(void)
	{
	if (!dbus)
	return;

	dbus_watch_handle(dbus->watch, DBUS_WATCH_READABLE);
	while (dbus_connection_get_dispatch_status(dbus->conn)
	== DBUS_DISPATCH_DATA_REMAINS) {
	dbus_connection_dispatch(dbus->conn);
	}
	}

	void dbus_report_user_activity(int activity_type)
	{
	dbus_bool_t allow_off = false;
	if (!dbus)
	return;

	dbus_method_call1(kPowerManagerServiceName,
	kPowerManagerServicePath,
	kPowerManagerInterface,
	kHandleUserActivityMethod,
	DBUS_TYPE_INT32, &activity_type);

	switch (activity_type) {
	case USER_ACTIVITY_BRIGHTNESS_UP_KEY_PRESS:
	(void)dbus_method_call0(kPowerManagerServiceName,
	kPowerManagerServicePath,
	kPowerManagerInterface,
	kIncreaseScreenBrightnessMethod);
	break;
	case USER_ACTIVITY_BRIGHTNESS_DOWN_KEY_PRESS:
	/*
	* Shouldn't allow the screen to go
	* completely off while frecon is active
	* so passing false to allow_off
	*/
	(void)dbus_method_call1(kPowerManagerServiceName,
	kPowerManagerServicePath,
	kPowerManagerInterface,
	kDecreaseScreenBrightnessMethod,
	DBUS_TYPE_BOOLEAN, &allow_off);
	break;
	}
	}

	/*
	* tell Chrome to take ownership of the display (DRM master)
	*/
	void dbus_take_display_ownership(void)
	{
	if (!dbus)
	return;
	(void)dbus_method_call0(kLibCrosServiceName,
	kLibCrosServicePath,
	kLibCrosServiceInterface,
	kTakeDisplayOwnership);
	}

	/*
	* ask Chrome to give up display ownership (DRM master)
	*/
	bool dbus_release_display_ownership(void)
	{
	if (!dbus)
	return true;
	return dbus_method_call0(kLibCrosServiceName,
	kLibCrosServicePath,
	kLibCrosServiceInterface,
	kReleaseDisplayOwnership);
	}

	void dbus_set_login_prompt_visible_callback(void (callback)(void),
	void* userptr)
	{
	if (chrome_is_already_up) {
	if (callback)
	callback(userptr);
	} else {
	if (login_prompt_visible_callback && callback) {
	LOG(ERROR, "trying to register login prompt visible callback multiple times");
	return;
	}
	login_prompt_visible_callback = callback;
	login_prompt_visible_callback_userptr = userptr;
	}
	}

	void dbus_set_suspend_done_callback(void (callback)(void),
	void* userptr)
	{
	if (suspend_done_callback && callback) {
	LOG(ERROR, "trying to register login prompt visible callback multiple times");
	return;
	}
	suspend_done_callback = callback;
	suspend_done_callback_userptr = userptr;
	}

	#else

	#include <stdlib.h>
	#include <stdbool.h>

	bool dbus_init()
	{
	return true;
	}

	bool dbus_init_wait()
	{
	return true;
	}

	void dbus_destroy(void)
	{
	}

	void dbus_add_fds(fd_set* read_set, fd_set* exception_set, int *maxfd)
	{
	}

	void dbus_dispatch_io(void)
	{
	}

	void dbus_report_user_activity(int activity_type)
	{
	}

	void dbus_take_display_ownership(void)
	{
	}

	bool dbus_release_display_ownership(void)
	{
	return true;
	}

	bool dbus_is_initialized(void)
	{
	return true;
	}

	void dbus_set_login_prompt_visible_callback(void (callback)(void),
	void* userptr)
	{
	}

	void dbus_set_suspend_done_callback(void (callback)(void),
	void* userptr)
	{
	}

	#endif