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display-helper-gnome3.cpp

Last change on this file was 99620, checked in by vboxsync, 12 months ago
Guest / Host: Renamed SessionType -> DisplayServerType (better naming to reflect its purpose). bugref:10427
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 37.8 KB

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1	/* $Id: display-helper-gnome3.cpp 99620 2023-05-05 09:08:00Z vboxsync $ */
2	/** @file
3	* Guest Additions - Gnome3 Desktop Environment helper.
4	*
5	* A helper for X11/Wayland Client which performs Gnome Desktop
6	* Environment specific actions.
7	*/
8
9	/*
10	* Copyright (C) 2006-2023 Oracle and/or its affiliates.
11	*
12	* This file is part of VirtualBox base platform packages, as
13	* available from https://www.virtualbox.org.
14	*
15	* This program is free software; you can redistribute it and/or
16	* modify it under the terms of the GNU General Public License
17	* as published by the Free Software Foundation, in version 3 of the
18	* License.
19	*
20	* This program is distributed in the hope that it will be useful, but
21	* WITHOUT ANY WARRANTY; without even the implied warranty of
22	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23	* General Public License for more details.
24	*
25	* You should have received a copy of the GNU General Public License
26	* along with this program; if not, see <https://www.gnu.org/licenses>.
27	*
28	* SPDX-License-Identifier: GPL-3.0-only
29	*/
30
31	/**
32	* This helper implements communication protocol between gnome-settings-daemon
33	* and itself using interface defined in (revision e88467f9):
34	*
35	* https://gitlab.gnome.org/GNOME/mutter/-/blob/main/src/org.gnome.Mutter.DisplayConfig.xml
36	*/
37
38	#include "VBoxClient.h"
39	#include "display-helper.h"
40
41	#include <stdio.h>
42	#include <stdlib.h>
43
44	#include <VBox/log.h>
45	#include <VBox/VBoxGuestLib.h>
46
47	#include <iprt/env.h>
48	#include <iprt/initterm.h>
49	#include <iprt/message.h>
50	#include <iprt/dir.h>
51	#include <iprt/err.h>
52	#include <iprt/mem.h>
53	#include <iprt/string.h>
54
55	/** Load libDbus symbols needed for us. */
56	#include <VBox/dbus.h>
57	/* Declarations of the functions that we need from libXrandr. */
58	#define VBOX_DBUS_GENERATE_BODY
59	#include <VBox/dbus-calls.h>
60
61	/** D-bus parameters for connecting to Gnome display service. */
62	#define VBOXCLIENT_HELPER_DBUS_DESTINATION "org.gnome.Mutter.DisplayConfig"
63	#define VBOXCLIENT_HELPER_DBUS_PATH "/org/gnome/Mutter/DisplayConfig"
64	#define VBOXCLIENT_HELPER_DBUS_IFACE "org.gnome.Mutter.DisplayConfig"
65	#define VBOXCLIENT_HELPER_DBUS_GET_METHOD "GetCurrentState"
66	#define VBOXCLIENT_HELPER_DBUS_APPLY_METHOD "ApplyMonitorsConfig"
67
68	/** D-bus communication timeout value, milliseconds.*/
69	#define VBOXCLIENT_HELPER_DBUS_TIMEOUT_MS (1 * 1000)
70
71	/** gnome-settings-daemon ApplyMonitorsConfig method:
72	* 0: verify - test if configuration can be applied and do not change anything,
73	* 1: temporary - apply configuration temporary, all will be reverted after re-login,
74	* 2: persistent - apply configuration permanently (asks for user confirmation).
75	*/
76	#define VBOXCLIENT_APPLY_DISPLAY_CONFIG_METHOD (1)
77
78	/**
79	* Helper macro which is used in order to simplify code when batch of
80	* values needed to be parsed out of D-bus. Macro prevents execution
81	* of the 'next' command if 'previous' one was failed (tracked via
82	* local variable _ret). It is required that '_ret' should be initialized
83	* to TRUE before batch started.
84	*
85	* @param _ret Local variable which is used in order to track execution flow.
86	* @param _call A function (with full arguments) which returns 'dbus_bool_t'.
87	*/
88	#define VBCL_HLP_GNOME3_NEXT(_ret, _call) \
89	{ _ret &= _ret ? _call : _ret; if (!ret) VBClLogError(__FILE__ ":%d: check fail here!\n", __LINE__); }
90
91	/**
92	* This structure describes sub-part of physical monitor state
93	* required to compose a payload for calling ApplyMonitorsConfig method. */
94	struct vbcl_hlp_gnome3_physical_display_state
95	{
96	/** Physical display connector name string. */
97	char *connector;
98	/** Current mode name string for physical display. */
99	char *mode;
100	};
101
102	/**
103	* Verify if data represented by D-bus message iteration corresponds to given data type.
104	*
105	* @return True if D-bus message iteration corresponds to given data type, False otherwise.
106	* @param iter D-bus message iteration.
107	* @param type D-bus data type.
108	*/
109	static dbus_bool_t vbcl_hlp_gnome3_verify_data_type(DBusMessageIter *iter, int type)
110	{
111	if (!iter)
112	return false;
113
114	if (dbus_message_iter_get_arg_type(iter) != type)
115	return false;
116
117	return true;
118	}
119
120	/**
121	* Verifies D-bus iterator signature.
122	*
123	* @return True if iterator signature matches to given one.
124	* @param iter D-bus iterator to check.
125	* @param signature Expected iterator signature.
126	*/
127	static dbus_bool_t vbcl_hlp_gnome3_check_iter_signature(DBusMessageIter iter, const char signature)
128	{
129	char *iter_signature;
130	dbus_bool_t match;
131
132	if ( !iter
133	\|\| !signature)
134	{
135	return false;
136	}
137
138	/* In case of dbus_message_iter_get_signature() returned memory should be freed by us. */
139	iter_signature = dbus_message_iter_get_signature(iter);
140	match = (strcmp(iter_signature, signature) == 0);
141
142	if (!match)
143	VBClLogError("iter signature mismatch: '%s' vs. '%s'\n", signature, iter_signature);
144
145	if (iter_signature)
146	dbus_free(iter_signature);
147
148	return match;
149	}
150
151	/**
152	* Verifies D-bus message signature.
153	*
154	* @return True if message signature matches to given one.
155	* @param message D-bus message to check.
156	* @param signature Expected message signature.
157	*/
158	static dbus_bool_t vbcl_hlp_gnome3_check_message_signature(DBusMessage message, const char signature)
159	{
160	char *message_signature;
161	dbus_bool_t match;
162
163	if ( !message
164	\|\| !signature)
165	{
166	return false;
167	}
168
169	/* In case of dbus_message_get_signature() returned memory need NOT be freed by us. */
170	message_signature = dbus_message_get_signature(message);
171	match = (strcmp(message_signature, signature) == 0);
172
173	if (!match)
174	VBClLogError("message signature mismatch: '%s' vs. '%s'\n", signature, message_signature);
175
176	return match;
177	}
178
179	/**
180	* Jump into DBUS_TYPE_ARRAY iter container and initialize sub-iterator
181	* aimed to traverse container child nodes.
182	*
183	* @return True if operation was successful, False otherwise.
184	* @param iter D-bus iter of type DBUS_TYPE_ARRAY.
185	* @param array Returned sub-iterator.
186	*/
187	static dbus_bool_t vbcl_hlp_gnome3_iter_get_array(DBusMessageIter iter, DBusMessageIter array)
188	{
189	if (!iter \|\| !array)
190	return false;
191
192	if (vbcl_hlp_gnome3_verify_data_type(iter, DBUS_TYPE_ARRAY))
193	{
194	dbus_message_iter_recurse(iter, array);
195	/* Move to the next iter, returned value not important. */
196	dbus_message_iter_next(iter);
197	return true;
198	}
199	else
200	{
201	VBClLogError(
202	"cannot get array: argument signature '%s' does not match to type of array\n",
203	dbus_message_iter_get_signature(iter));
204	}
205
206	return false;
207	}
208
209	/**
210	* Get value of D-bus iter of specified simple type (numerals, strings).
211	*
212	* @return True if operation was successful, False otherwise.
213	* @param iter D-bus iter of type simple type.
214	* @param type D-bus data type.
215	* @param value Returned value.
216	*/
217	static dbus_bool_t vbcl_hlp_gnome3_iter_get_basic(DBusMessageIter iter, int type, void value)
218	{
219	if (!iter \|\| !value)
220	return false;
221
222	if (vbcl_hlp_gnome3_verify_data_type(iter, type))
223	{
224	dbus_message_iter_get_basic(iter, value);
225	/* Move to the next iter, returned value not important. */
226	dbus_message_iter_next(iter);
227	return true;
228	}
229	else
230	{
231	VBClLogError(
232	"cannot get value: argument signature '%s' does not match to specified type\n",
233	dbus_message_iter_get_signature(iter));
234	}
235
236	return false;
237	}
238
239	/**
240	* Lookup simple value (numeral, string, bool etc) in D-bus dictionary
241	* by given key and type.
242	*
243	* @return True value is found, False otherwise.
244	* @param dict D-bus iterator which represents dictionary.
245	* @param key_match Dictionary key.
246	* @param type Type of value.
247	* @param value Returning value.
248	*/
249	static dbus_bool_t vbcl_hlp_gnome3_lookup_dict(DBusMessageIter dict, const char key_match, int type, void *value)
250	{
251	dbus_bool_t found = false;
252
253	if (!dict \|\| !key_match)
254	return false;
255
256	if (!vbcl_hlp_gnome3_check_iter_signature(dict, "{sv}"))
257	return false;
258
259	do
260	{
261	dbus_bool_t ret = true;
262	DBusMessageIter iter;
263	char *key = NULL;
264
265	/* Proceed to part a{ > sv < } of a{sv}. */
266	dbus_message_iter_recurse(dict, &iter);
267
268	/* Should be TRUE in order to satisfy VBCL_HLP_GNOME3_NEXT() requirements. */
269	AssertReturn(ret, false);
270
271	/* Proceed to part a{ > s < v} of a{sv}. */
272	VBCL_HLP_GNOME3_NEXT(ret, vbcl_hlp_gnome3_iter_get_basic(&iter, DBUS_TYPE_STRING, &key));
273
274	/* Check if key matches. */
275	if (strcmp(key_match, key) == 0)
276	{
277	DBusMessageIter value_iter;
278
279	/* Proceed to part a{s > v < } of a{sv}. */
280	dbus_message_iter_recurse(&iter, &value_iter);
281	VBCL_HLP_GNOME3_NEXT(ret, vbcl_hlp_gnome3_iter_get_basic(&value_iter, type, value));
282
283	/* Make sure there are no more arguments. */
284	VBCL_HLP_GNOME3_NEXT(ret, !dbus_message_iter_has_next(&value_iter));
285
286	if (ret)
287	{
288	found = true;
289	break;
290	}
291	}
292	}
293	while (dbus_message_iter_next(dict));
294
295	return found;
296	}
297
298	/**
299	* Go through available modes and pick up the one which has property 'is-current' set.
300	* See GetCurrentState interface documentation for more details. Returned string memory
301	* must be freed by calling function.
302	*
303	* @return Mode name as a string if found, NULL otherwise.
304	* @param modes List of monitor modes.
305	*/
306	static char vbcl_hlp_gnome3_lookup_monitor_current_mode(DBusMessageIter modes)
307	{
308	char *szCurrentMode = NULL;
309	DBusMessageIter modes_iter;
310
311	/* De-serialization parameters for 'modes': (siiddada{sv}). */
312	char *id = NULL;
313	int32_t width = 0;
314	int32_t height = 0;
315	double refresh_rate = 0;
316	double preferred_scale = 0;
317	DBusMessageIter supported_scales;
318	DBusMessageIter properties;
319
320	if (!modes)
321	return NULL;
322
323	if(!vbcl_hlp_gnome3_check_iter_signature(modes, "(siiddada{sv})"))
324	return NULL;
325
326	do
327	{
328	static const char *key_match = "is-current";
329	dbus_bool_t default_mode_found = false;
330	dbus_bool_t ret = true;
331
332	/* Should be TRUE in order to satisfy VBCL_HLP_GNOME3_NEXT() requirements. */
333	AssertReturn(ret, NULL);
334
335	/* Proceed to part a( > siiddada{sv} < ) of a(siiddada{sv}). */
336	dbus_message_iter_recurse(modes, &modes_iter);
337	VBCL_HLP_GNOME3_NEXT(ret, vbcl_hlp_gnome3_iter_get_basic(&modes_iter, DBUS_TYPE_STRING, &id));
338	VBCL_HLP_GNOME3_NEXT(ret, vbcl_hlp_gnome3_iter_get_basic(&modes_iter, DBUS_TYPE_INT32, &width));
339	VBCL_HLP_GNOME3_NEXT(ret, vbcl_hlp_gnome3_iter_get_basic(&modes_iter, DBUS_TYPE_INT32, &height));
340	VBCL_HLP_GNOME3_NEXT(ret, vbcl_hlp_gnome3_iter_get_basic(&modes_iter, DBUS_TYPE_DOUBLE, &refresh_rate));
341	VBCL_HLP_GNOME3_NEXT(ret, vbcl_hlp_gnome3_iter_get_basic(&modes_iter, DBUS_TYPE_DOUBLE, &preferred_scale));
342	VBCL_HLP_GNOME3_NEXT(ret, vbcl_hlp_gnome3_iter_get_array(&modes_iter, &supported_scales));
343	VBCL_HLP_GNOME3_NEXT(ret, vbcl_hlp_gnome3_iter_get_array(&modes_iter, &properties));
344
345	ret = vbcl_hlp_gnome3_lookup_dict(&properties, key_match, DBUS_TYPE_BOOLEAN, &default_mode_found);
346	if (ret && default_mode_found)
347	{
348	szCurrentMode = strdup(id);
349	break;
350	}
351	}
352	while (dbus_message_iter_next(modes));
353
354	return szCurrentMode;
355	}
356
357	/**
358	* Parse physical monitors list entry. See GetCurrentState interface documentation for more details.
359	*
360	* @return True if monitors list entry has been successfully parsed, False otherwise.
361	* @param physical_monitors_in D-bus iterator representing list of physical monitors.
362	* @param connector Connector name (out).
363	* @param vendor Vendor name (out).
364	* @param product Product name (out).
365	* @param physical_monitor_serial Serial number (out).
366	* @param modes List of monitor modes (out).
367	* @param physical_monitor_properties A D-bus dictionary containing monitor properties (out).
368	*/
369	static dbus_bool_t vbcl_hlp_gnome3_parse_physical_monitor_record(
370	DBusMessageIter *physical_monitors_in,
371	char **connector,
372	char **vendor,
373	char **product,
374	char **physical_monitor_serial,
375	DBusMessageIter *modes,
376	DBusMessageIter *physical_monitor_properties)
377	{
378	dbus_bool_t ret = true;
379
380	DBusMessageIter physical_monitors_in_iter;
381	DBusMessageIter physical_monitors_in_description_iter;
382
383	if ( !physical_monitors_in
384	\|\| !connector
385	\|\| !vendor
386	\|\| !product
387	\|\| !physical_monitor_serial
388	\|\| !modes
389	\|\| !physical_monitor_properties)
390	{
391	return false;
392	}
393
394	/* Validate signature. */
395	if (!vbcl_hlp_gnome3_check_iter_signature(physical_monitors_in, "((ssss)a(siiddada{sv})a{sv})"))
396	return false;
397
398	/* Proceed to part ( > (ssss)a(siiddada{sv})a{sv} < ) of ((ssss)a(siiddada{sv})a{sv}). */
399	dbus_message_iter_recurse(physical_monitors_in, &physical_monitors_in_iter);
400
401	/* Should be TRUE in order to satisfy VBCL_HLP_GNOME3_NEXT() requirements. */
402	AssertReturn(ret, false);
403
404	/* Proceed to part ( > (ssss) < a(siiddada{sv})a{sv}) of ((ssss)a(siiddada{sv})a{sv}). */
405	dbus_message_iter_recurse(&physical_monitors_in_iter, &physical_monitors_in_description_iter);
406	VBCL_HLP_GNOME3_NEXT(ret, vbcl_hlp_gnome3_iter_get_basic(&physical_monitors_in_description_iter, DBUS_TYPE_STRING, connector));
407	VBCL_HLP_GNOME3_NEXT(ret, vbcl_hlp_gnome3_iter_get_basic(&physical_monitors_in_description_iter, DBUS_TYPE_STRING, vendor));
408	VBCL_HLP_GNOME3_NEXT(ret, vbcl_hlp_gnome3_iter_get_basic(&physical_monitors_in_description_iter, DBUS_TYPE_STRING, product));
409	VBCL_HLP_GNOME3_NEXT(ret, vbcl_hlp_gnome3_iter_get_basic(&physical_monitors_in_description_iter, DBUS_TYPE_STRING, physical_monitor_serial));
410
411	/* Proceed to part ((ssss) > a(siiddada{sv}) < a{sv}) of ((ssss)a(siiddada{sv})a{sv}). */
412	if (ret)
413	dbus_message_iter_next(&physical_monitors_in_iter);
414
415	VBCL_HLP_GNOME3_NEXT(ret, vbcl_hlp_gnome3_iter_get_array(&physical_monitors_in_iter, modes));
416
417	/* Proceed to part ((ssss)a(siiddada{sv}) > a{sv} < ) of ((ssss)a(siiddada{sv})a{sv}). */
418	VBCL_HLP_GNOME3_NEXT(ret, vbcl_hlp_gnome3_iter_get_array(&physical_monitors_in_iter, physical_monitor_properties));
419
420	/* Make sure there are no more arguments. */
421	VBCL_HLP_GNOME3_NEXT(ret, !dbus_message_iter_has_next(&physical_monitors_in_iter));
422
423	return ret;
424	}
425
426	/**
427	* Parse logical monitors list entry. See GetCurrentState interface documentation for more details.
428	*
429	* @return True if monitors list entry has been successfully parsed, False otherwise.
430	* @param logical_monitors_in D-bus iterator representing list of logical monitors.
431	* @param x Monitor X position (out).
432	* @param y Monitor Y position (out).
433	* @param scale Monitor scale factor (out).
434	* @param transform Current monitor transform (rotation) (out).
435	* @param primary A flag which indicates if monitor is set as primary (out).
436	* @param monitors List of physical monitors which are displaying this logical monitor (out).
437	* @param properties List of monitor properties (out).
438	*/
439	static dbus_bool_t vbcl_hlp_gnome3_parse_logical_monitor_record(
440	DBusMessageIter *logical_monitors_in,
441	int32_t *x,
442	int32_t *y,
443	double *scale,
444	uint32_t *transform,
445	dbus_bool_t *primary,
446	DBusMessageIter *monitors,
447	DBusMessageIter *properties)
448	{
449	dbus_bool_t ret = true;
450
451	/* Iter used to traverse logical monitor parameters: @a(iiduba(ssss)a{sv}). */
452	DBusMessageIter logical_monitors_in_iter;
453
454	if ( !logical_monitors_in
455	\|\| !x
456	\|\| !y
457	\|\| !scale
458	\|\| !transform
459	\|\| !primary
460	\|\| !monitors
461	\|\| !properties)
462
463	/* Should be TRUE in order to satisfy VBCL_HLP_GNOME3_NEXT() requirements. */
464	AssertReturn(ret, false);
465
466	/* Proceed to part @a( > iiduba(ssss)a{sv} < ) of @a(iiduba(ssss)a{sv}). */
467	dbus_message_iter_recurse(logical_monitors_in, &logical_monitors_in_iter);
468	VBCL_HLP_GNOME3_NEXT(ret, vbcl_hlp_gnome3_iter_get_basic(&logical_monitors_in_iter, DBUS_TYPE_INT32, x));
469	VBCL_HLP_GNOME3_NEXT(ret, vbcl_hlp_gnome3_iter_get_basic(&logical_monitors_in_iter, DBUS_TYPE_INT32, y));
470	VBCL_HLP_GNOME3_NEXT(ret, vbcl_hlp_gnome3_iter_get_basic(&logical_monitors_in_iter, DBUS_TYPE_DOUBLE, scale));
471	VBCL_HLP_GNOME3_NEXT(ret, vbcl_hlp_gnome3_iter_get_basic(&logical_monitors_in_iter, DBUS_TYPE_UINT32, transform));
472	VBCL_HLP_GNOME3_NEXT(ret, vbcl_hlp_gnome3_iter_get_basic(&logical_monitors_in_iter, DBUS_TYPE_BOOLEAN, primary));
473	/* Proceed to part @a(iidub > a(ssss) < a{sv}) of @a(iiduba(ssss)a{sv}). */
474	VBCL_HLP_GNOME3_NEXT(ret, vbcl_hlp_gnome3_iter_get_array(&logical_monitors_in_iter, monitors));
475	/* Proceed to part @a(iiduba(ssss) > a{sv} < ) of @a(iiduba(ssss)a{sv}). */
476	VBCL_HLP_GNOME3_NEXT(ret, vbcl_hlp_gnome3_iter_get_array(&logical_monitors_in_iter, properties));
477
478	/* Make sure there are no more arguments. */
479	VBCL_HLP_GNOME3_NEXT(ret, !dbus_message_iter_has_next(&logical_monitors_in_iter));
480
481	return ret;
482	}
483
484	/**
485	* Get list of physical monitors parameters from D-bus iterator.
486	*
487	* Once this function was traversed 'physical_monitors_in' iterator, we are in the
488	* end of the list of physical monitors parameters. So, it is important to do it once.
489	*
490	* @return True if monitors parameters were successfully discovered, False otherwise.
491	* @param physical_monitors_in D-bus iterator representing list of physical monitors.
492	* @param state Storage to put monitors state to.
493	* @param state_records_max Size of state storage.
494	* @param cPhysicalMonitors Actual number of physical displays parsed.
495	*/
496	static dbus_bool_t vbcl_hlp_gnome3_get_physical_monitors_state(
497	DBusMessageIter *physical_monitors_in,
498	vbcl_hlp_gnome3_physical_display_state *state,
499	uint32_t state_records_max,
500	uint32_t *cPhysicalMonitors)
501	{
502	dbus_bool_t ret = true;
503	uint32_t iMonitor = 0;
504
505	if ( !physical_monitors_in
506	\|\| !state
507	\|\| !cPhysicalMonitors)
508	{
509	return false;
510	}
511
512	/* Validate signature. */
513	if (!vbcl_hlp_gnome3_check_iter_signature(physical_monitors_in, "((ssss)a(siiddada{sv})a{sv})"))
514	return false;
515
516	/* Should be TRUE in order to satisfy VBCL_HLP_GNOME3_NEXT() requirements. */
517	AssertReturn(ret, false);
518
519	do
520	{
521	char *connector = NULL;
522	char *vendor = NULL;
523	char *product = NULL;
524	char *physical_monitor_serial = NULL;
525	DBusMessageIter modes;
526	DBusMessageIter physical_monitor_properties;
527
528	VBCL_HLP_GNOME3_NEXT(ret, vbcl_hlp_gnome3_parse_physical_monitor_record(
529	physical_monitors_in, &connector, &vendor, &product, &physical_monitor_serial,
530	&modes, &physical_monitor_properties));
531
532	if (iMonitor < state_records_max)
533	{
534	state[iMonitor].connector = connector;
535	state[iMonitor].mode = vbcl_hlp_gnome3_lookup_monitor_current_mode(&modes);
536
537	/* Check if both parameters were discovered successfully. */
538	VBCL_HLP_GNOME3_NEXT(ret, state[iMonitor].connector && state[iMonitor].mode);
539	}
540
541	iMonitor++;
542
543	}
544	while (ret && dbus_message_iter_next(physical_monitors_in));
545
546	if (iMonitor >= state_records_max)
547	{
548	VBClLogError("physical monitors list is too big (%u)\n", iMonitor);
549	ret = false;
550	}
551
552	*cPhysicalMonitors = iMonitor;
553
554	return ret;
555	}
556
557	/**
558	* Release monitors state resources.
559	*
560	* @param state Array of monitor states.
561	* @param cPhysicalMonitors Number of elements in array.
562	*/
563	static void vbcl_hlp_gnome3_free_physical_monitors_state(
564	vbcl_hlp_gnome3_physical_display_state *state,
565	uint32_t cPhysicalMonitors)
566	{
567	if (!state \|\| !cPhysicalMonitors)
568	return;
569
570	for (uint32_t i = 0; i < cPhysicalMonitors; i++)
571	{
572	/* Only free() what we allocated ourselves. */
573	if (state[i].mode)
574	free(state[i].mode);
575	}
576	}
577
578	/**
579	* Add dictionary element with boolean value into an array.
580	*
581	* @return True on success, False otherwise.
582	* @param parent_iter Array to add dictionary element into.
583	* @param key Dictionary key.
584	* @param value Boolean value for given key.
585	*/
586	static dbus_bool_t vbcl_hlp_gnome3_add_dict_bool_entry(
587	DBusMessageIter parent_iter, const char key, const dbus_bool_t value)
588	{
589	dbus_bool_t ret = true;
590
591	DBusMessageIter sub_iter_key;
592	DBusMessageIter sub_iter_value;
593
594	RT_ZERO(sub_iter_key);
595	RT_ZERO(sub_iter_value);
596
597	/* Should be TRUE in order to satisfy VBCL_HLP_GNOME3_NEXT() requirements. */
598	AssertReturn(ret, false);
599
600	VBCL_HLP_GNOME3_NEXT(ret, dbus_message_iter_open_container(parent_iter, DBUS_TYPE_DICT_ENTRY, NULL, &sub_iter_key));
601	{
602	VBCL_HLP_GNOME3_NEXT(ret, dbus_message_iter_append_basic(&sub_iter_key, DBUS_TYPE_STRING, &key));
603
604	VBCL_HLP_GNOME3_NEXT(ret, dbus_message_iter_open_container(&sub_iter_key, ((int) 'v'), "b", &sub_iter_value));
605	{
606	VBCL_HLP_GNOME3_NEXT(ret, dbus_message_iter_append_basic(&sub_iter_value, DBUS_TYPE_BOOLEAN, &value));
607	}
608
609	VBCL_HLP_GNOME3_NEXT(ret, dbus_message_iter_close_container(&sub_iter_key, &sub_iter_value));
610	}
611	VBCL_HLP_GNOME3_NEXT(ret, dbus_message_iter_close_container(parent_iter, &sub_iter_key));
612
613	return ret;
614	}
615
616	/**
617	* This function is responsible for gathering current display
618	* information (via its helper functions), compose a payload
619	* for ApplyMonitorsConfig method and finally send configuration
620	* change to gnome-settings-daemon over D-bus.
621	*
622	* @return IPRT status code.
623	* @param connection Handle to D-bus connection.
624	* @param serial Serial number obtained from GetCurrentState interface,
625	* needs to be passed to ApplyMonitorsConfig.
626	* @param physical_monitors_in List of physical monitors (see GetCurrentState).
627	* @param logical_monitors_in List of logical monitors (see GetCurrentState).
628	* @param idPrimaryDisplay ID (number) of display which is requested to be set as primary.
629	*/
630	static int vbcl_hlp_gnome3_convert_and_apply_display_settings(
631	DBusConnection *connection,
632	uint32_t serial,
633	DBusMessageIter *physical_monitors_in,
634	DBusMessageIter *logical_monitors_in,
635	uint32_t idPrimaryDisplay)
636	{
637	int rc = VERR_INVALID_PARAMETER;
638	uint32_t iLogicalMonitor = 0;
639	uint32_t cPhysicalMonitors = 0;
640	int32_t method = VBOXCLIENT_APPLY_DISPLAY_CONFIG_METHOD;
641
642	dbus_bool_t ret = true;
643	DBusError error;
644	DBusMessage *reply = NULL;;
645	DBusMessage *message = NULL;
646	DBusMessageIter message_iter;
647	DBusMessageIter logical_monitors_out_iter;
648	DBusMessageIter properties_out_iter;
649
650	struct vbcl_hlp_gnome3_physical_display_state
651	physical_monitors_state[VBOX_DRMIPC_MONITORS_MAX];
652
653	if ( !connection
654	\|\| !physical_monitors_in
655	\|\| !logical_monitors_in)
656	{
657	return VERR_INVALID_PARAMETER;
658	}
659
660	/* Important for error handling code path when dbus_message_iter_abandon_container_if_open() is in place. */
661	RT_ZERO(message_iter);
662	RT_ZERO(logical_monitors_out_iter);
663	RT_ZERO(properties_out_iter);
664
665	message = dbus_message_new_method_call(
666	VBOXCLIENT_HELPER_DBUS_DESTINATION,
667	VBOXCLIENT_HELPER_DBUS_PATH,
668	VBOXCLIENT_HELPER_DBUS_IFACE,
669	VBOXCLIENT_HELPER_DBUS_APPLY_METHOD);
670	if (!message)
671	{
672	VBClLogError("unable to apply monitors config: no memory\n");
673	return VERR_NO_MEMORY;
674	}
675
676	/* Start composing payload for ApplyMonitorsConfig method: (uu@a(iiduba(ssa{sv}))@a{sv}). */
677	dbus_message_iter_init_append(message, &message_iter);
678
679	/* Should be TRUE in order to satisfy VBCL_HLP_GNOME3_NEXT() requirements. */
680	AssertReturn(ret, VERR_INVALID_PARAMETER);
681
682	/* Get list of physical monitors parameters. */
683	VBCL_HLP_GNOME3_NEXT(ret, vbcl_hlp_gnome3_get_physical_monitors_state(
684	physical_monitors_in, physical_monitors_state, VBOX_DRMIPC_MONITORS_MAX, &cPhysicalMonitors));
685
686	/* ( >u< u@a(iiduba(ssa{sv}))@a{sv}) of (uu@a(iiduba(ssa{sv}))@a{sv}). */
687	VBCL_HLP_GNOME3_NEXT(ret, dbus_message_iter_append_basic(&message_iter, DBUS_TYPE_UINT32, &serial));
688	/* (u >u< @a(iiduba(ssa{sv}))@a{sv}) of (uu@a(iiduba(ssa{sv}))@a{sv}). */
689	VBCL_HLP_GNOME3_NEXT(ret, dbus_message_iter_append_basic(&message_iter, DBUS_TYPE_UINT32, &method));
690
691	/* Parameter "monitors" of method ApplyMonitorsConfig.
692	* Part (uu >@a(iiduba(ssa{sv}))< @a{sv}) of (uu@a(iiduba(ssa{sv}))@a{sv}). */
693	VBCL_HLP_GNOME3_NEXT(ret, dbus_message_iter_open_container(&message_iter, DBUS_TYPE_ARRAY, "(iiduba(ssa{sv}))", &logical_monitors_out_iter));
694
695	/* Iterate over current configuration monitors (@logical_monitors
696	* parameter of GetCurrentState interface) and compose the rest part of message. */
697	do
698	{
699	/* De-serialization parameters for @logical_monitors data (see GetCurrentState interface documentation). */
700	int32_t x = 0;
701	int32_t y = 0;
702	double scale = 0;
703	uint32_t transform = 0;
704	dbus_bool_t primary = false;
705	dbus_bool_t isPrimary = false;
706	DBusMessageIter monitors;
707	DBusMessageIter properties;
708
709	/* These iterators are used in order to compose sub-containers of the message. */
710	DBusMessageIter sub_iter0;
711	DBusMessageIter sub_iter1;
712	DBusMessageIter sub_iter2;
713	DBusMessageIter sub_iter3;
714	/* Important for error handling code path when dbus_message_iter_abandon_container_if_open() is in place. */
715	RT_ZERO(sub_iter0);
716	RT_ZERO(sub_iter1);
717	RT_ZERO(sub_iter2);
718	RT_ZERO(sub_iter3);
719
720	VBCL_HLP_GNOME3_NEXT(ret, vbcl_hlp_gnome3_parse_logical_monitor_record(
721	logical_monitors_in, &x, &y, &scale, &transform, &primary, &monitors, &properties));
722
723	if (ret)
724	{
725	/* Whether current display supposed to be set as primary. */
726	isPrimary = (iLogicalMonitor == idPrimaryDisplay);
727
728	/* Compose part (uu@a( > iiduba(ssa{sv}) < )@a{sv}) of (uu@a(iiduba(ssa{sv}))@a{sv}). */
729	VBCL_HLP_GNOME3_NEXT(ret, dbus_message_iter_open_container(&logical_monitors_out_iter, DBUS_TYPE_STRUCT, NULL, &sub_iter0));
730	{
731	VBCL_HLP_GNOME3_NEXT(ret, dbus_message_iter_append_basic(&sub_iter0, DBUS_TYPE_INT32, &x));
732	VBCL_HLP_GNOME3_NEXT(ret, dbus_message_iter_append_basic(&sub_iter0, DBUS_TYPE_INT32, &y));
733	VBCL_HLP_GNOME3_NEXT(ret, dbus_message_iter_append_basic(&sub_iter0, DBUS_TYPE_DOUBLE, &scale));
734	VBCL_HLP_GNOME3_NEXT(ret, dbus_message_iter_append_basic(&sub_iter0, DBUS_TYPE_UINT32, &transform));
735	VBCL_HLP_GNOME3_NEXT(ret, dbus_message_iter_append_basic(&sub_iter0, DBUS_TYPE_BOOLEAN, &isPrimary));
736
737	/* Compose part (uu@a(iidub > a(ssa{sv}) < )@a{sv}) of (uu@a(iiduba(ssa{sv}))@a{sv}). */
738	VBCL_HLP_GNOME3_NEXT(ret, dbus_message_iter_open_container(&sub_iter0, DBUS_TYPE_ARRAY, "(ssa{sv})", &sub_iter1));
739	{
740	/* Compose part (uu@a(iiduba > (ssa{sv}) < )@a{sv}) of (uu@a(iiduba(ssa{sv}))@a{sv}). */
741	VBCL_HLP_GNOME3_NEXT(ret, dbus_message_iter_open_container(&sub_iter1, DBUS_TYPE_STRUCT, NULL, &sub_iter2));
742	{
743	VBCL_HLP_GNOME3_NEXT(ret, dbus_message_iter_append_basic(&sub_iter2, DBUS_TYPE_STRING, &physical_monitors_state[iLogicalMonitor].connector));
744	VBCL_HLP_GNOME3_NEXT(ret, dbus_message_iter_append_basic(&sub_iter2, DBUS_TYPE_STRING, &physical_monitors_state[iLogicalMonitor].mode));
745
746	/* Compose part (uu@a(iiduba(ss > a{sv} < ))@a{sv}) of (uu@a(iiduba(ssa{sv}))@a{sv}). */
747	VBCL_HLP_GNOME3_NEXT(ret, dbus_message_iter_open_container(&sub_iter2, DBUS_TYPE_ARRAY, "{sv}", &sub_iter3));
748	VBCL_HLP_GNOME3_NEXT(ret, vbcl_hlp_gnome3_add_dict_bool_entry(&sub_iter3, "is-current", true));
749	VBCL_HLP_GNOME3_NEXT(ret, vbcl_hlp_gnome3_add_dict_bool_entry(&sub_iter3, "is-preferred", true));
750	VBCL_HLP_GNOME3_NEXT(ret, dbus_message_iter_close_container(&sub_iter2, &sub_iter3));
751	}
752	VBCL_HLP_GNOME3_NEXT(ret, dbus_message_iter_close_container(&sub_iter1, &sub_iter2));
753	}
754	VBCL_HLP_GNOME3_NEXT(ret, dbus_message_iter_close_container(&sub_iter0, &sub_iter1));
755	}
756	VBCL_HLP_GNOME3_NEXT(ret, dbus_message_iter_close_container(&logical_monitors_out_iter, &sub_iter0));
757
758	iLogicalMonitor++;
759
760	if (!ret)
761	{
762	dbus_message_iter_abandon_container_if_open(&sub_iter2, &sub_iter3);
763	dbus_message_iter_abandon_container_if_open(&sub_iter1, &sub_iter2);
764	dbus_message_iter_abandon_container_if_open(&sub_iter0, &sub_iter1);
765	dbus_message_iter_abandon_container_if_open(&logical_monitors_out_iter, &sub_iter0);
766	}
767	}
768	else
769	{
770	break;
771	}
772
773	}
774	while (ret && dbus_message_iter_next(logical_monitors_in));
775
776	/* Finish with parameter "monitors" of method ApplyMonitorsConfig. */
777	VBCL_HLP_GNOME3_NEXT(ret, dbus_message_iter_close_container(&message_iter, &logical_monitors_out_iter));
778
779	/* Parameter "properties" of method ApplyMonitorsConfig (empty dict).
780	* Part (uu@a(iiduba(ssa{sv})) >@a{sv}< ) of (uu@a(iiduba(ssa{sv}))@a{sv}).*/
781	VBCL_HLP_GNOME3_NEXT(ret, dbus_message_iter_open_container(&message_iter, DBUS_TYPE_ARRAY, "{sv}", &properties_out_iter));
782	VBCL_HLP_GNOME3_NEXT(ret, dbus_message_iter_close_container(&message_iter, &properties_out_iter));
783
784	if (ret)
785	{
786	dbus_error_init(&error);
787
788	reply = dbus_connection_send_with_reply_and_block(connection, message, VBOXCLIENT_HELPER_DBUS_TIMEOUT_MS, &error);
789	if (reply)
790	{
791	VBClLogInfo("display %d has been set as primary\n", idPrimaryDisplay);
792	dbus_message_unref(reply);
793	rc = VINF_SUCCESS;
794	}
795	else
796	{
797	VBClLogError("unable to apply monitors config: %s\n",
798	dbus_error_is_set(&error) ? error.message : "unknown error");
799	dbus_error_free(&error);
800	rc = VERR_INVALID_PARAMETER;
801	}
802	}
803	else
804	{
805	VBClLogError("unable to apply monitors config: cannot compose monitors config\n");
806
807	dbus_message_iter_abandon_container_if_open(&message_iter, &logical_monitors_out_iter);
808	dbus_message_iter_abandon_container_if_open(&message_iter, &properties_out_iter);
809
810	rc = VERR_INVALID_PARAMETER;
811	}
812
813	/* Clean physical monitors state. */
814	vbcl_hlp_gnome3_free_physical_monitors_state(physical_monitors_state, cPhysicalMonitors);
815
816	dbus_message_unref(message);
817
818	return rc;
819	}
820
821	/**
822	* This function parses GetCurrentState interface call reply and passes it for further processing.
823	*
824	* @return IPRT status code.
825	* @param connection Handle to D-bus connection.
826	* @param idPrimaryDisplay ID (number) of display which is requested to be set as primary.
827	* @param reply Reply message of GetCurrentState call.
828	*/
829	static int vbcl_hlp_gnome3_process_current_display_layout(
830	DBusConnection connection, uint32_t idPrimaryDisplay, DBusMessage reply)
831	{
832	static const char *expected_signature = "ua((ssss)a(siiddada{sv})a{sv})a(iiduba(ssss)a{sv})a{sv}";
833
834	dbus_bool_t ret = true;
835	DBusMessageIter iter;
836	int rc = VERR_GENERAL_FAILURE;
837
838	uint32_t serial = 0;
839	DBusMessageIter monitors;
840	DBusMessageIter logical_monitors_in;
841	DBusMessageIter properties;
842
843	if (!reply)
844	{
845	return VERR_INVALID_PARAMETER;
846	}
847
848	/* Parse VBOXCLIENT_HELPER_DBUS_GET_METHOD reply payload:
849	*
850	* (u@a((ssss)a(siiddada{sv})a{sv})@a(iiduba(ssss)a{sv})@a{sv}).
851	*
852	* Method return the following arguments: monitors, logical_monitors, properties.
853	*/
854
855	/* Should be TRUE in order to satisfy VBCL_HLP_GNOME3_NEXT() requirements. */
856	AssertReturn(ret, VERR_INVALID_PARAMETER);
857
858	/* Important: in order to avoid libdbus asserts during parsing, its signature should be verified at first. */
859	VBCL_HLP_GNOME3_NEXT(ret, vbcl_hlp_gnome3_check_message_signature(reply, expected_signature));
860
861	VBCL_HLP_GNOME3_NEXT(ret, dbus_message_iter_init(reply, &iter));
862	if (ret)
863	{
864	VBCL_HLP_GNOME3_NEXT(ret, vbcl_hlp_gnome3_iter_get_basic(&iter, DBUS_TYPE_UINT32, &serial));
865	VBCL_HLP_GNOME3_NEXT(ret, vbcl_hlp_gnome3_iter_get_array(&iter, &monitors));
866	VBCL_HLP_GNOME3_NEXT(ret, vbcl_hlp_gnome3_iter_get_array(&iter, &logical_monitors_in));
867	VBCL_HLP_GNOME3_NEXT(ret, vbcl_hlp_gnome3_iter_get_array(&iter, &properties));
868
869	/* Make sure there are no more arguments. */
870	if (ret && !dbus_message_iter_has_next(&iter))
871	{
872	rc = vbcl_hlp_gnome3_convert_and_apply_display_settings(
873	connection, serial, &monitors, &logical_monitors_in, idPrimaryDisplay);
874	}
875	else
876	{
877	VBClLogError("cannot fetch current displays configuration: incorrect number of arguments\n");
878	rc = VERR_INVALID_PARAMETER;
879	}
880	}
881	else
882	{
883	VBClLogError("cannot fetch current displays configuration: no data\n");
884	rc = VERR_INVALID_PARAMETER;
885	}
886
887	return rc;
888	}
889
890	/**
891	* This function establishes D-bus connection, requests gnome-settings-daemon
892	* to provide current display configuration via GetCurrentState interface call
893	* and passes this information further to helper functions in order to set
894	* requested display as primary.
895	*
896	* @return IPRT status code.
897	* @param idPrimaryDisplay A display ID which is requested to be set as primary.
898	*/
899	static DECLCALLBACK(int) vbcl_hlp_gnome3_set_primary_display(uint32_t idPrimaryDisplay)
900	{
901	int rc = VERR_GENERAL_FAILURE;
902
903	DBusConnection *connection = NULL;
904	DBusMessage *message = NULL;
905	DBusError error;
906
907	rc = RTDBusLoadLib();
908	if (RT_FAILURE(rc))
909	{
910	VBClLogError("unable to load D-bus library\n");
911	return VERR_SYMBOL_NOT_FOUND;
912	}
913
914	dbus_error_init(&error);
915	connection = dbus_bus_get(DBUS_BUS_SESSION, &error);
916	if (!dbus_error_is_set(&error))
917	{
918	message = dbus_message_new_method_call(
919	VBOXCLIENT_HELPER_DBUS_DESTINATION,
920	VBOXCLIENT_HELPER_DBUS_PATH,
921	VBOXCLIENT_HELPER_DBUS_IFACE,
922	VBOXCLIENT_HELPER_DBUS_GET_METHOD);
923
924	if (message)
925	{
926	DBusMessage *reply;
927
928	reply = dbus_connection_send_with_reply_and_block(connection, message, VBOXCLIENT_HELPER_DBUS_TIMEOUT_MS, &error);
929	if (!dbus_error_is_set(&error))
930	{
931	rc = vbcl_hlp_gnome3_process_current_display_layout(connection, idPrimaryDisplay, reply);
932	dbus_message_unref(reply);
933	}
934	else
935	{
936	VBClLogError("unable to get current display configuration: %s\n", error.message);
937	dbus_error_free(&error);
938	rc = VERR_INVALID_PARAMETER;
939	}
940
941	dbus_message_unref(message);
942	}
943	else
944	{
945	VBClLogError("unable to get current display configuration: no memory\n");
946	rc = VERR_NO_MEMORY;
947	}
948
949	dbus_connection_flush(connection);
950	}
951	else
952	{
953	VBClLogError("unable to establish dbus connection: %s\n", error.message);
954	dbus_error_free(&error);
955	rc = VERR_INVALID_HANDLE;
956	}
957
958	return rc;
959	}
960
961	/**
962	* @interface_method_impl{VBCLDISPLAYHELPER,pfnProbe}
963	*/
964	static DECLCALLBACK(int) vbcl_hlp_gnome3_probe(void)
965	{
966	const char *pszCurrentDesktop = RTEnvGet(VBGH_ENV_XDG_CURRENT_DESKTOP);
967
968	/* GNOME3 identifies itself by XDG_CURRENT_DESKTOP environment variable.
969	* It can slightly vary for different distributions, but we assume that this
970	* variable should at least contain sub-string 'GNOME' in its value. */
971	if (pszCurrentDesktop && RTStrStr(pszCurrentDesktop, "GNOME"))
972	return VINF_SUCCESS;
973
974	return VERR_NOT_FOUND;
975	}
976
977	/**
978	* @interface_method_impl{VBCLDISPLAYHELPER,pfnInit}
979	*/
980	static DECLCALLBACK(int) vbcl_hlp_gnome3_init(void)
981	{
982	int rc;
983
984	if (VBClGetDisplayServerType() == VBGHDISPLAYSERVERTYPE_X11)
985	{
986	rc = vbcl_hlp_generic_init();
987	VBClLogInfo("attempt to start generic helper routines, rc=%Rrc\n", rc);
988	}
989
990	return VINF_SUCCESS;
991	}
992
993	/**
994	* @interface_method_impl{VBCLDISPLAYHELPER,pfnTerm}
995	*/
996	static DECLCALLBACK(int) vbcl_hlp_gnome3_term(void)
997	{
998	int rc;
999
1000	if (VBClGetDisplayServerType() == VBGHDISPLAYSERVERTYPE_X11)
1001	{
1002	rc = vbcl_hlp_generic_term();
1003	VBClLogInfo("attempt to stop generic helper routines, rc=%Rrc\n", rc);
1004	}
1005
1006	return VINF_SUCCESS;
1007	}
1008
1009	/* Helper callbacks. */
1010	const VBCLDISPLAYHELPER g_DisplayHelperGnome3 =
1011	{
1012	"GNOME3", /* .pszName */
1013	vbcl_hlp_gnome3_probe, /* .pfnProbe */
1014	vbcl_hlp_gnome3_init, /* .pfnInit */
1015	vbcl_hlp_gnome3_term, /* .pfnTerm */
1016	vbcl_hlp_gnome3_set_primary_display, /* .pfnSetPrimaryDisplay */
1017	vbcl_hlp_generic_subscribe_display_offset_changed, /* .pfnSubscribeDisplayOffsetChangeNotification */
1018	vbcl_hlp_generic_unsubscribe_display_offset_changed, /* .pfnUnsubscribeDisplayOffsetChangeNotification */
1019	};

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source: vbox/trunk/src/VBox/Additions/x11/VBoxClient/display-helper-gnome3.cpp

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