xclip.c@ 13351

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1	/* -- c-basic-offset: 8 --
2	rdesktop: A Remote Desktop Protocol client.
3	Protocol services - Clipboard functions
4	Copyright (C) Erik Forsberg <[email protected]> 2003-2007
5	Copyright (C) Matthew Chapman 2003-2007
6
7	This program is free software; you can redistribute it and/or modify
8	it under the terms of the GNU General Public License as published by
9	the Free Software Foundation; either version 2 of the License, or
10	(at your option) any later version.
11
12	This program is distributed in the hope that it will be useful,
13	but WITHOUT ANY WARRANTY; without even the implied warranty of
14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15	GNU General Public License for more details.
16
17	You should have received a copy of the GNU General Public License
18	along with this program; if not, write to the Free Software
19	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20	*/
21
22	/*
23	* Sun GPL Disclaimer: For the avoidance of doubt, except that if any license choice
24	* other than GPL or LGPL is available it will apply instead, Sun elects to use only
25	* the General Public License version 2 (GPLv2) at this time for any software where
26	* a choice of GPL license versions is made available with the language indicating
27	* that GPLv2 or any later version may be used, or where a choice of which version
28	* of the GPL is applied is otherwise unspecified.
29	*/
30
31	#include <X11/Xlib.h>
32	#include <X11/Xatom.h>
33	#include "rdesktop.h"
34
35	/*
36	To gain better understanding of this code, one could be assisted by the following documents:
37	- Inter-Client Communication Conventions Manual (ICCCM)
38	HTML: http://tronche.com/gui/x/icccm/
39	PDF: http://ftp.xfree86.org/pub/XFree86/4.5.0/doc/PDF/icccm.pdf
40	- MSDN: Clipboard Formats
41	http://msdn.microsoft.com/library/en-us/winui/winui/windowsuserinterface/dataexchange/clipboard/clipboardformats.asp
42	*/
43
44	#ifdef HAVE_ICONV
45	#ifdef HAVE_LANGINFO_H
46	#ifdef HAVE_ICONV_H
47	#include <langinfo.h>
48	#include <iconv.h>
49	#define USE_UNICODE_CLIPBOARD
50	#endif
51	#endif
52	#endif
53
54	#ifdef USE_UNICODE_CLIPBOARD
55	#define RDP_CF_TEXT CF_UNICODETEXT
56	#else
57	#define RDP_CF_TEXT CF_TEXT
58	#endif
59
60	#define MAX_TARGETS 8
61
62	extern Display *g_display;
63	extern Window g_wnd;
64	extern Time g_last_gesturetime;
65	extern RD_BOOL g_rdpclip;
66
67	/* Mode of operation.
68	- Auto: Look at both PRIMARY and CLIPBOARD and use the most recent.
69	- Non-auto: Look at just CLIPBOARD. */
70	static RD_BOOL auto_mode = True;
71	/* Atoms of the two X selections we're dealing with: CLIPBOARD (explicit-copy) and PRIMARY (selection-copy) */
72	static Atom clipboard_atom, primary_atom;
73	/* Atom of the TARGETS clipboard target */
74	static Atom targets_atom;
75	/* Atom of the TIMESTAMP clipboard target */
76	static Atom timestamp_atom;
77	/* Atom _RDESKTOP_CLIPBOARD_TARGET which is used as the 'property' argument in
78	XConvertSelection calls: This is the property of our window into which
79	XConvertSelection will store the received clipboard data. */
80	static Atom rdesktop_clipboard_target_atom;
81	/* Atoms _RDESKTOP_PRIMARY_TIMESTAMP_TARGET and _RDESKTOP_CLIPBOARD_TIMESTAMP_TARGET
82	are used to store the timestamps for when a window got ownership of the selections.
83	We use these to determine which is more recent and should be used. */
84	static Atom rdesktop_primary_timestamp_target_atom, rdesktop_clipboard_timestamp_target_atom;
85	/* Storage for timestamps since we get them in two separate notifications. */
86	static Time primary_timestamp, clipboard_timestamp;
87	/* Clipboard target for getting a list of native Windows clipboard formats. The
88	presence of this target indicates that the selection owner is another rdesktop. */
89	static Atom rdesktop_clipboard_formats_atom;
90	/* The clipboard target (X jargon for "clipboard format") for rdesktop-to-rdesktop
91	interchange of Windows native clipboard data. The requestor must supply the
92	desired native Windows clipboard format in the associated property. */
93	static Atom rdesktop_native_atom;
94	/* Local copy of the list of native Windows clipboard formats. */
95	static uint8 *formats_data = NULL;
96	static uint32 formats_data_length = 0;
97	/* We need to know when another rdesktop process gets or loses ownership of a
98	selection. Without XFixes we do this by touching a property on the root window
99	which will generate PropertyNotify notifications. */
100	static Atom rdesktop_selection_notify_atom;
101	/* State variables that indicate if we're currently probing the targets of the
102	selection owner. reprobe_selections indicate that the ownership changed in
103	the middle of the current probe so it should be restarted. */
104	static RD_BOOL probing_selections, reprobe_selections;
105	/* Atoms _RDESKTOP_PRIMARY_OWNER and _RDESKTOP_CLIPBOARD_OWNER. Used as properties
106	on the root window to indicate which selections that are owned by rdesktop. */
107	static Atom rdesktop_primary_owner_atom, rdesktop_clipboard_owner_atom;
108	static Atom format_string_atom, format_utf8_string_atom, format_unicode_atom;
109	/* Atom of the INCR clipboard type (see ICCCM on "INCR Properties") */
110	static Atom incr_atom;
111	/* Stores the last "selection request" (= another X client requesting clipboard data from us).
112	To satisfy such a request, we request the clipboard data from the RDP server.
113	When we receive the response from the RDP server (asynchronously), this variable gives us
114	the context to proceed. */
115	static XSelectionRequestEvent selection_request;
116	/* Denotes we have a pending selection request. */
117	static RD_BOOL has_selection_request;
118	/* Stores the clipboard format (CF_TEXT, CF_UNICODETEXT etc.) requested in the last
119	CLIPDR_DATA_REQUEST (= the RDP server requesting clipboard data from us).
120	When we receive this data from whatever X client offering it, this variable gives us
121	the context to proceed.
122	*/
123	static int rdp_clipboard_request_format;
124	/* Array of offered clipboard targets that will be sent to fellow X clients upon a TARGETS request. */
125	static Atom targets[MAX_TARGETS];
126	static int num_targets;
127	/* Denotes that an rdesktop (not this rdesktop) is owning the selection,
128	allowing us to interchange Windows native clipboard data directly. */
129	static RD_BOOL rdesktop_is_selection_owner = False;
130	/* Time when we acquired the selection. */
131	static Time acquire_time = 0;
132
133	/* Denotes that an INCR ("chunked") transfer is in progress. */
134	static int g_waiting_for_INCR = 0;
135	/* Denotes the target format of the ongoing INCR ("chunked") transfer. */
136	static Atom g_incr_target = 0;
137	/* Buffers an INCR transfer. */
138	static uint8 *g_clip_buffer = 0;
139	/* Denotes the size of g_clip_buffer. */
140	static uint32 g_clip_buflen = 0;
141
142	/* Translates CR-LF to LF.
143	Changes the string in-place.
144	Does not stop on embedded nulls.
145	The length is updated. */
146	static void
147	crlf2lf(uint8 * data, uint32 * length)
148	{
149	uint8 dst, src;
150	src = dst = data;
151	while (src < data + *length)
152	{
153	if (*src != '\x0d')
154	dst++ = src;
155	src++;
156	}
157	*length = dst - data;
158	}
159
160	#ifdef USE_UNICODE_CLIPBOARD
161	/* Translate LF to CR-LF. To do this, we must allocate more memory.
162	The returned string is null-terminated, as required by CF_UNICODETEXT.
163	The size is updated. */
164	static uint8 *
165	utf16_lf2crlf(uint8 * data, uint32 * size)
166	{
167	uint8 *result;
168	uint16 inptr, outptr;
169	RD_BOOL swap_endianess;
170
171	/* Worst case: Every char is LF */
172	result = xmalloc((size 2) + 2);
173	if (result == NULL)
174	return NULL;
175
176	inptr = (uint16 *) data;
177	outptr = (uint16 *) result;
178
179	/* Check for a reversed BOM */
180	swap_endianess = (*inptr == 0xfffe);
181
182	uint16 uvalue_previous = 0; /* Kept so we'll avoid translating CR-LF to CR-CR-LF */
183	while ((uint8 ) inptr < data + size)
184	{
185	uint16 uvalue = *inptr;
186	if (swap_endianess)
187	uvalue = ((uvalue << 8) & 0xff00) + (uvalue >> 8);
188	if ((uvalue == 0x0a) && (uvalue_previous != 0x0d))
189	*outptr++ = swap_endianess ? 0x0d00 : 0x0d;
190	uvalue_previous = uvalue;
191	outptr++ = inptr++;
192	}
193	outptr++ = 0; / null termination */
194	size = (uint8 ) outptr - result;
195
196	return result;
197	}
198	#else
199	/* Translate LF to CR-LF. To do this, we must allocate more memory.
200	The length is updated. */
201	static uint8 *
202	lf2crlf(uint8 * data, uint32 * length)
203	{
204	uint8 result, p, *o;
205
206	/* Worst case: Every char is LF */
207	result = xmalloc(length 2);
208
209	p = data;
210	o = result;
211
212	uint8 previous = '\0'; /* Kept to avoid translating CR-LF to CR-CR-LF */
213	while (p < data + *length)
214	{
215	if ((*p == '\x0a') && (previous != '\x0d'))
216	*o++ = '\x0d';
217	previous = *p;
218	o++ = p++;
219	}
220	*length = o - result;
221
222	/* Convenience */
223	*o++ = '\0';
224
225	return result;
226	}
227	#endif
228
229	static void
230	xclip_provide_selection(XSelectionRequestEvent * req, Atom type, unsigned int format, uint8 * data,
231	uint32 length)
232	{
233	XEvent xev;
234
235	DEBUG_CLIPBOARD(("xclip_provide_selection: requestor=0x%08x, target=%s, property=%s, length=%u\n", (unsigned) req->requestor, XGetAtomName(g_display, req->target), XGetAtomName(g_display, req->property), (unsigned) length));
236
237	XChangeProperty(g_display, req->requestor, req->property,
238	type, format, PropModeReplace, data, length);
239
240	xev.xselection.type = SelectionNotify;
241	xev.xselection.serial = 0;
242	xev.xselection.send_event = True;
243	xev.xselection.requestor = req->requestor;
244	xev.xselection.selection = req->selection;
245	xev.xselection.target = req->target;
246	xev.xselection.property = req->property;
247	xev.xselection.time = req->time;
248	XSendEvent(g_display, req->requestor, False, NoEventMask, &xev);
249	}
250
251	/* Replies a clipboard requestor, telling that we're unable to satisfy his request for whatever reason.
252	This has the benefit of finalizing the clipboard negotiation and thus not leaving our requestor
253	lingering (and, potentially, stuck). */
254	static void
255	xclip_refuse_selection(XSelectionRequestEvent * req)
256	{
257	XEvent xev;
258
259	DEBUG_CLIPBOARD(("xclip_refuse_selection: requestor=0x%08x, target=%s, property=%s\n",
260	(unsigned) req->requestor, XGetAtomName(g_display, req->target),
261	XGetAtomName(g_display, req->property)));
262
263	xev.xselection.type = SelectionNotify;
264	xev.xselection.serial = 0;
265	xev.xselection.send_event = True;
266	xev.xselection.requestor = req->requestor;
267	xev.xselection.selection = req->selection;
268	xev.xselection.target = req->target;
269	xev.xselection.property = None;
270	xev.xselection.time = req->time;
271	XSendEvent(g_display, req->requestor, False, NoEventMask, &xev);
272	}
273
274	/* Wrapper for cliprdr_send_data which also cleans the request state. */
275	static void
276	helper_cliprdr_send_response(uint8 * data, uint32 length)
277	{
278	if (rdp_clipboard_request_format != 0)
279	{
280	cliprdr_send_data(data, length);
281	rdp_clipboard_request_format = 0;
282	if (!rdesktop_is_selection_owner)
283	cliprdr_send_simple_native_format_announce(RDP_CF_TEXT);
284	}
285	}
286
287	/* Last resort, when we have to provide clipboard data but for whatever
288	reason couldn't get any.
289	*/
290	static void
291	helper_cliprdr_send_empty_response()
292	{
293	helper_cliprdr_send_response(NULL, 0);
294	}
295
296	/* Replies with clipboard data to RDP, converting it from the target format
297	to the expected RDP format as necessary. Returns true if data was sent.
298	*/
299	static RD_BOOL
300	xclip_send_data_with_convert(uint8 * source, size_t source_size, Atom target)
301	{
302	DEBUG_CLIPBOARD(("xclip_send_data_with_convert: target=%s, size=%u\n",
303	XGetAtomName(g_display, target), (unsigned) source_size));
304
305	#ifdef USE_UNICODE_CLIPBOARD
306	if (target == format_string_atom \|\|
307	target == format_unicode_atom \|\| target == format_utf8_string_atom)
308	{
309	size_t unicode_buffer_size;
310	char *unicode_buffer;
311	iconv_t cd;
312	size_t unicode_buffer_size_remaining;
313	char *unicode_buffer_remaining;
314	char *data_remaining;
315	size_t data_size_remaining;
316	uint32 translated_data_size;
317	uint8 *translated_data;
318
319	if (rdp_clipboard_request_format != RDP_CF_TEXT)
320	return False;
321
322	/* Make an attempt to convert any string we send to Unicode.
323	We don't know what the RDP server's ANSI Codepage is, or how to convert
324	to it, so using CF_TEXT is not safe (and is unnecessary, since all
325	WinNT versions are Unicode-minded).
326	*/
327	if (target == format_string_atom)
328	{
329	char *locale_charset = nl_langinfo(CODESET);
330	cd = iconv_open(WINDOWS_CODEPAGE, locale_charset);
331	if (cd == (iconv_t) - 1)
332	{
333	DEBUG_CLIPBOARD(("Locale charset %s not found in iconv. Unable to convert clipboard text.\n", locale_charset));
334	return False;
335	}
336	unicode_buffer_size = source_size * 4;
337	}
338	else if (target == format_unicode_atom)
339	{
340	cd = iconv_open(WINDOWS_CODEPAGE, "UCS-2");
341	if (cd == (iconv_t) - 1)
342	{
343	return False;
344	}
345	unicode_buffer_size = source_size;
346	}
347	else if (target == format_utf8_string_atom)
348	{
349	cd = iconv_open(WINDOWS_CODEPAGE, "UTF-8");
350	if (cd == (iconv_t) - 1)
351	{
352	return False;
353	}
354	/* UTF-8 is guaranteed to be less or equally compact
355	as UTF-16 for all Unicode chars >=2 bytes.
356	*/
357	unicode_buffer_size = source_size * 2;
358	}
359	else
360	{
361	return False;
362	}
363
364	unicode_buffer = xmalloc(unicode_buffer_size);
365	unicode_buffer_size_remaining = unicode_buffer_size;
366	unicode_buffer_remaining = unicode_buffer;
367	data_remaining = (char *) source;
368	data_size_remaining = source_size;
369	iconv(cd, (ICONV_CONST char **) &data_remaining, &data_size_remaining,
370	&unicode_buffer_remaining, &unicode_buffer_size_remaining);
371	iconv_close(cd);
372
373	/* translate linebreaks */
374	translated_data_size = unicode_buffer_size - unicode_buffer_size_remaining;
375	translated_data = utf16_lf2crlf((uint8 *) unicode_buffer, &translated_data_size);
376	if (translated_data != NULL)
377	{
378	DEBUG_CLIPBOARD(("Sending Unicode string of %d bytes\n",
379	translated_data_size));
380	helper_cliprdr_send_response(translated_data, translated_data_size);
381	xfree(translated_data); /* Not the same thing as XFree! */
382	}
383
384	xfree(unicode_buffer);
385
386	return True;
387	}
388	#else
389	if (target == format_string_atom)
390	{
391	uint8 *translated_data;
392	uint32 length = source_size;
393
394	if (rdp_clipboard_request_format != RDP_CF_TEXT)
395	return False;
396
397	DEBUG_CLIPBOARD(("Translating linebreaks before sending data\n"));
398	translated_data = lf2crlf(source, &length);
399	if (translated_data != NULL)
400	{
401	helper_cliprdr_send_response(translated_data, length);
402	xfree(translated_data); /* Not the same thing as XFree! */
403	}
404
405	return True;
406	}
407	#endif
408	else if (target == rdesktop_native_atom)
409	{
410	helper_cliprdr_send_response(source, source_size + 1);
411
412	return True;
413	}
414	else
415	{
416	return False;
417	}
418	}
419
420	static void
421	xclip_clear_target_props()
422	{
423	XDeleteProperty(g_display, g_wnd, rdesktop_clipboard_target_atom);
424	XDeleteProperty(g_display, g_wnd, rdesktop_primary_timestamp_target_atom);
425	XDeleteProperty(g_display, g_wnd, rdesktop_clipboard_timestamp_target_atom);
426	}
427
428	static void
429	xclip_notify_change()
430	{
431	XChangeProperty(g_display, DefaultRootWindow(g_display),
432	rdesktop_selection_notify_atom, XA_INTEGER, 32, PropModeReplace, NULL, 0);
433	}
434
435	static void
436	xclip_probe_selections()
437	{
438	Window primary_owner, clipboard_owner;
439
440	if (probing_selections)
441	{
442	DEBUG_CLIPBOARD(("Already probing selections. Scheduling reprobe.\n"));
443	reprobe_selections = True;
444	return;
445	}
446
447	DEBUG_CLIPBOARD(("Probing selections.\n"));
448
449	probing_selections = True;
450	reprobe_selections = False;
451
452	xclip_clear_target_props();
453
454	if (auto_mode)
455	primary_owner = XGetSelectionOwner(g_display, primary_atom);
456	else
457	primary_owner = None;
458
459	clipboard_owner = XGetSelectionOwner(g_display, clipboard_atom);
460
461	/* If we own all relevant selections then don't do anything. */
462	if (((primary_owner == g_wnd) \|\| !auto_mode) && (clipboard_owner == g_wnd))
463	goto end;
464
465	/* Both available */
466	if ((primary_owner != None) && (clipboard_owner != None))
467	{
468	primary_timestamp = 0;
469	clipboard_timestamp = 0;
470	XConvertSelection(g_display, primary_atom, timestamp_atom,
471	rdesktop_primary_timestamp_target_atom, g_wnd, CurrentTime);
472	XConvertSelection(g_display, clipboard_atom, timestamp_atom,
473	rdesktop_clipboard_timestamp_target_atom, g_wnd, CurrentTime);
474	return;
475	}
476
477	/* Just PRIMARY */
478	if (primary_owner != None)
479	{
480	XConvertSelection(g_display, primary_atom, targets_atom,
481	rdesktop_clipboard_target_atom, g_wnd, CurrentTime);
482	return;
483	}
484
485	/* Just CLIPBOARD */
486	if (clipboard_owner != None)
487	{
488	XConvertSelection(g_display, clipboard_atom, targets_atom,
489	rdesktop_clipboard_target_atom, g_wnd, CurrentTime);
490	return;
491	}
492
493	DEBUG_CLIPBOARD(("No owner of any selection.\n"));
494
495	/* FIXME:
496	Without XFIXES, we cannot reliably know the formats offered by an
497	upcoming selection owner, so we just lie about him offering
498	RDP_CF_TEXT. */
499	cliprdr_send_simple_native_format_announce(RDP_CF_TEXT);
500
501	end:
502	probing_selections = False;
503	}
504
505	/* This function is called for SelectionNotify events.
506	The SelectionNotify event is sent from the clipboard owner to the requestor
507	after his request was satisfied.
508	If this function is called, we're the requestor side. */
509	#ifndef MAKE_PROTO
510	void
511	xclip_handle_SelectionNotify(XSelectionEvent * event)
512	{
513	unsigned long nitems, bytes_left;
514	XWindowAttributes wa;
515	Atom type;
516	Atom *supported_targets;
517	int res, i, format;
518	uint8 *data = NULL;
519
520	if (event->property == None)
521	goto fail;
522
523	DEBUG_CLIPBOARD(("xclip_handle_SelectionNotify: selection=%s, target=%s, property=%s\n",
524	XGetAtomName(g_display, event->selection),
525	XGetAtomName(g_display, event->target),
526	XGetAtomName(g_display, event->property)));
527
528	if (event->target == timestamp_atom)
529	{
530	if (event->selection == primary_atom)
531	{
532	res = XGetWindowProperty(g_display, g_wnd,
533	rdesktop_primary_timestamp_target_atom, 0,
534	XMaxRequestSize(g_display), False, AnyPropertyType,
535	&type, &format, &nitems, &bytes_left, &data);
536	}
537	else
538	{
539	res = XGetWindowProperty(g_display, g_wnd,
540	rdesktop_clipboard_timestamp_target_atom, 0,
541	XMaxRequestSize(g_display), False, AnyPropertyType,
542	&type, &format, &nitems, &bytes_left, &data);
543	}
544
545
546	if ((res != Success) \|\| (nitems != 1) \|\| (format != 32))
547	{
548	DEBUG_CLIPBOARD(("XGetWindowProperty failed!\n"));
549	goto fail;
550	}
551
552	if (event->selection == primary_atom)
553	{
554	primary_timestamp = (Time ) data;
555	if (primary_timestamp == 0)
556	primary_timestamp++;
557	XDeleteProperty(g_display, g_wnd, rdesktop_primary_timestamp_target_atom);
558	DEBUG_CLIPBOARD(("Got PRIMARY timestamp: %u\n",
559	(unsigned) primary_timestamp));
560	}
561	else
562	{
563	clipboard_timestamp = (Time ) data;
564	if (clipboard_timestamp == 0)
565	clipboard_timestamp++;
566	XDeleteProperty(g_display, g_wnd, rdesktop_clipboard_timestamp_target_atom);
567	DEBUG_CLIPBOARD(("Got CLIPBOARD timestamp: %u\n",
568	(unsigned) clipboard_timestamp));
569	}
570
571	XFree(data);
572
573	if (primary_timestamp && clipboard_timestamp)
574	{
575	if (primary_timestamp > clipboard_timestamp)
576	{
577	DEBUG_CLIPBOARD(("PRIMARY is most recent selection.\n"));
578	XConvertSelection(g_display, primary_atom, targets_atom,
579	rdesktop_clipboard_target_atom, g_wnd,
580	event->time);
581	}
582	else
583	{
584	DEBUG_CLIPBOARD(("CLIPBOARD is most recent selection.\n"));
585	XConvertSelection(g_display, clipboard_atom, targets_atom,
586	rdesktop_clipboard_target_atom, g_wnd,
587	event->time);
588	}
589	}
590
591	return;
592	}
593
594	if (probing_selections && reprobe_selections)
595	{
596	probing_selections = False;
597	xclip_probe_selections();
598	return;
599	}
600
601	res = XGetWindowProperty(g_display, g_wnd, rdesktop_clipboard_target_atom,
602	0, XMaxRequestSize(g_display), False, AnyPropertyType,
603	&type, &format, &nitems, &bytes_left, &data);
604
605	xclip_clear_target_props();
606
607	if (res != Success)
608	{
609	DEBUG_CLIPBOARD(("XGetWindowProperty failed!\n"));
610	goto fail;
611	}
612
613	if (type == incr_atom)
614	{
615	DEBUG_CLIPBOARD(("Received INCR.\n"));
616
617	XGetWindowAttributes(g_display, g_wnd, &wa);
618	if ((wa.your_event_mask \| PropertyChangeMask) != wa.your_event_mask)
619	{
620	XSelectInput(g_display, g_wnd, (wa.your_event_mask \| PropertyChangeMask));
621	}
622	XFree(data);
623	g_incr_target = event->target;
624	g_waiting_for_INCR = 1;
625	goto end;
626	}
627
628	/* Negotiate target format */
629	if (event->target == targets_atom)
630	{
631	/* Determine the best of text targets that we have available:
632	Prefer UTF8_STRING > text/unicode (unspecified encoding) > STRING
633	(ignore TEXT and COMPOUND_TEXT because we don't have code to handle them)
634	*/
635	int text_target_satisfaction = 0;
636	Atom best_text_target = 0; /* measures how much we're satisfied with what we found */
637	if (type != None)
638	{
639	supported_targets = (Atom *) data;
640	for (i = 0; i < nitems; i++)
641	{
642	DEBUG_CLIPBOARD(("Target %d: %s\n", i,
643	XGetAtomName(g_display, supported_targets[i])));
644	if (supported_targets[i] == format_string_atom)
645	{
646	if (text_target_satisfaction < 1)
647	{
648	DEBUG_CLIPBOARD(("Other party supports STRING, choosing that as best_target\n"));
649	best_text_target = supported_targets[i];
650	text_target_satisfaction = 1;
651	}
652	}
653	#ifdef USE_UNICODE_CLIPBOARD
654	else if (supported_targets[i] == format_unicode_atom)
655	{
656	if (text_target_satisfaction < 2)
657	{
658	DEBUG_CLIPBOARD(("Other party supports text/unicode, choosing that as best_target\n"));
659	best_text_target = supported_targets[i];
660	text_target_satisfaction = 2;
661	}
662	}
663	else if (supported_targets[i] == format_utf8_string_atom)
664	{
665	if (text_target_satisfaction < 3)
666	{
667	DEBUG_CLIPBOARD(("Other party supports UTF8_STRING, choosing that as best_target\n"));
668	best_text_target = supported_targets[i];
669	text_target_satisfaction = 3;
670	}
671	}
672	#endif
673	else if (supported_targets[i] == rdesktop_clipboard_formats_atom)
674	{
675	if (probing_selections && (text_target_satisfaction < 4))
676	{
677	DEBUG_CLIPBOARD(("Other party supports native formats, choosing that as best_target\n"));
678	best_text_target = supported_targets[i];
679	text_target_satisfaction = 4;
680	}
681	}
682	}
683	}
684
685	/* Kickstarting the next step in the process of satisfying RDP's
686	clipboard request -- specifically, requesting the actual clipboard data.
687	*/
688	if ((best_text_target != 0)
689	&& (!probing_selections
690	\|\| (best_text_target == rdesktop_clipboard_formats_atom)))
691	{
692	XConvertSelection(g_display, event->selection, best_text_target,
693	rdesktop_clipboard_target_atom, g_wnd, event->time);
694	goto end;
695	}
696	else
697	{
698	DEBUG_CLIPBOARD(("Unable to find a textual target to satisfy RDP clipboard text request\n"));
699	goto fail;
700	}
701	}
702	else
703	{
704	if (probing_selections)
705	{
706	Window primary_owner, clipboard_owner;
707
708	/* FIXME:
709	Without XFIXES, we must make sure that the other
710	rdesktop owns all relevant selections or we might try
711	to get a native format from non-rdesktop window later
712	on. */
713
714	clipboard_owner = XGetSelectionOwner(g_display, clipboard_atom);
715
716	if (auto_mode)
717	primary_owner = XGetSelectionOwner(g_display, primary_atom);
718	else
719	primary_owner = clipboard_owner;
720
721	if (primary_owner != clipboard_owner)
722	goto fail;
723
724	DEBUG_CLIPBOARD(("Got fellow rdesktop formats\n"));
725	probing_selections = False;
726	rdesktop_is_selection_owner = True;
727	cliprdr_send_native_format_announce(data, nitems);
728	}
729	else if ((!nitems) \|\| (!xclip_send_data_with_convert(data, nitems, event->target)))
730	{
731	goto fail;
732	}
733	}
734
735	end:
736	if (data)
737	XFree(data);
738
739	return;
740
741	fail:
742	xclip_clear_target_props();
743	if (probing_selections)
744	{
745	DEBUG_CLIPBOARD(("Unable to find suitable target. Using default text format.\n"));
746	probing_selections = False;
747	rdesktop_is_selection_owner = False;
748
749	/* FIXME:
750	Without XFIXES, we cannot reliably know the formats offered by an
751	upcoming selection owner, so we just lie about him offering
752	RDP_CF_TEXT. */
753	cliprdr_send_simple_native_format_announce(RDP_CF_TEXT);
754	}
755	else
756	{
757	helper_cliprdr_send_empty_response();
758	}
759	goto end;
760	}
761
762	/* This function is called for SelectionRequest events.
763	The SelectionRequest event is sent from the requestor to the clipboard owner
764	to request clipboard data.
765	*/
766	void
767	xclip_handle_SelectionRequest(XSelectionRequestEvent * event)
768	{
769	unsigned long nitems, bytes_left;
770	unsigned char *prop_return = NULL;
771	int format, res;
772	Atom type;
773
774	DEBUG_CLIPBOARD(("xclip_handle_SelectionRequest: selection=%s, target=%s, property=%s\n",
775	XGetAtomName(g_display, event->selection),
776	XGetAtomName(g_display, event->target),
777	XGetAtomName(g_display, event->property)));
778
779	if (event->target == targets_atom)
780	{
781	xclip_provide_selection(event, XA_ATOM, 32, (uint8 *) & targets, num_targets);
782	return;
783	}
784	else if (event->target == timestamp_atom)
785	{
786	xclip_provide_selection(event, XA_INTEGER, 32, (uint8 *) & acquire_time, 1);
787	return;
788	}
789	else if (event->target == rdesktop_clipboard_formats_atom)
790	{
791	xclip_provide_selection(event, XA_STRING, 8, formats_data, formats_data_length);
792	}
793	else
794	{
795	/* All the following targets require an async operation with the RDP server
796	and currently we don't do X clipboard request queueing so we can only
797	handle one such request at a time. */
798	if (has_selection_request)
799	{
800	DEBUG_CLIPBOARD(("Error: Another clipboard request was already sent to the RDP server and not yet responded. Refusing this request.\n"));
801	xclip_refuse_selection(event);
802	return;
803	}
804	if (event->target == rdesktop_native_atom)
805	{
806	/* Before the requestor makes a request for the _RDESKTOP_NATIVE target,
807	he should declare requestor[property] = CF_SOMETHING. */
808	res = XGetWindowProperty(g_display, event->requestor,
809	event->property, 0, 1, True,
810	XA_INTEGER, &type, &format, &nitems, &bytes_left,
811	&prop_return);
812	if (res != Success \|\| (!prop_return))
813	{
814	DEBUG_CLIPBOARD(("Requested native format but didn't specifiy which.\n"));
815	xclip_refuse_selection(event);
816	return;
817	}
818
819	format = (uint32 ) prop_return;
820	XFree(prop_return);
821	}
822	else if (event->target == format_string_atom \|\| event->target == XA_STRING)
823	{
824	/* STRING and XA_STRING are defined to be ISO8859-1 */
825	format = CF_TEXT;
826	}
827	else if (event->target == format_utf8_string_atom)
828	{
829	#ifdef USE_UNICODE_CLIPBOARD
830	format = CF_UNICODETEXT;
831	#else
832	DEBUG_CLIPBOARD(("Requested target unavailable due to lack of Unicode support. (It was not in TARGETS, so why did you ask for it?!)\n"));
833	xclip_refuse_selection(event);
834	return;
835	#endif
836	}
837	else if (event->target == format_unicode_atom)
838	{
839	/* Assuming text/unicode to be UTF-16 */
840	format = CF_UNICODETEXT;
841	}
842	else
843	{
844	DEBUG_CLIPBOARD(("Requested target unavailable. (It was not in TARGETS, so why did you ask for it?!)\n"));
845	xclip_refuse_selection(event);
846	return;
847	}
848
849	cliprdr_send_data_request(format);
850	selection_request = *event;
851	has_selection_request = True;
852	return; /* wait for data */
853	}
854	}
855
856	/* While this rdesktop holds ownership over the clipboard, it means the clipboard data
857	is offered by the RDP server (and when it is pasted inside RDP, there's no network
858	roundtrip).
859
860	This event (SelectionClear) symbolizes this rdesktop lost onwership of the clipboard
861	to some other X client. We should find out what clipboard formats this other
862	client offers and announce that to RDP. */
863	void
864	xclip_handle_SelectionClear(void)
865	{
866	DEBUG_CLIPBOARD(("xclip_handle_SelectionClear\n"));
867	xclip_notify_change();
868	xclip_probe_selections();
869	}
870
871	/* Called when any property changes in our window or the root window. */
872	void
873	xclip_handle_PropertyNotify(XPropertyEvent * event)
874	{
875	unsigned long nitems;
876	unsigned long offset = 0;
877	unsigned long bytes_left = 1;
878	int format;
879	XWindowAttributes wa;
880	uint8 *data;
881	Atom type;
882
883	if (event->state == PropertyNewValue && g_waiting_for_INCR)
884	{
885	DEBUG_CLIPBOARD(("x_clip_handle_PropertyNotify: g_waiting_for_INCR != 0\n"));
886
887	while (bytes_left > 0)
888	{
889	/* Unlike the specification, we don't set the 'delete' arugment to True
890	since we slurp the INCR's chunks in even-smaller chunks of 4096 bytes. */
891	if ((XGetWindowProperty
892	(g_display, g_wnd, rdesktop_clipboard_target_atom, offset, 4096L,
893	False, AnyPropertyType, &type, &format, &nitems, &bytes_left,
894	&data) != Success))
895	{
896	XFree(data);
897	return;
898	}
899
900	if (nitems == 0)
901	{
902	/* INCR transfer finished */
903	XGetWindowAttributes(g_display, g_wnd, &wa);
904	XSelectInput(g_display, g_wnd,
905	(wa.your_event_mask ^ PropertyChangeMask));
906	XFree(data);
907	g_waiting_for_INCR = 0;
908
909	if (g_clip_buflen > 0)
910	{
911	if (!xclip_send_data_with_convert
912	(g_clip_buffer, g_clip_buflen, g_incr_target))
913	{
914	helper_cliprdr_send_empty_response();
915	}
916	xfree(g_clip_buffer);
917	g_clip_buffer = NULL;
918	g_clip_buflen = 0;
919	}
920	}
921	else
922	{
923	/* Another chunk in the INCR transfer */
924	offset += (nitems / 4); /* offset at which to begin the next slurp */
925	g_clip_buffer = xrealloc(g_clip_buffer, g_clip_buflen + nitems);
926	memcpy(g_clip_buffer + g_clip_buflen, data, nitems);
927	g_clip_buflen += nitems;
928
929	XFree(data);
930	}
931	}
932	XDeleteProperty(g_display, g_wnd, rdesktop_clipboard_target_atom);
933	return;
934	}
935
936	if ((event->atom == rdesktop_selection_notify_atom) &&
937	(event->window == DefaultRootWindow(g_display)))
938	xclip_probe_selections();
939	}
940	#endif
941
942
943	/* Called when the RDP server announces new clipboard data formats.
944	In response, we:
945	- take ownership over the clipboard
946	- declare those formats in their Windows native form
947	to other rdesktop instances on this X server */
948	void
949	ui_clip_format_announce(uint8 * data, uint32 length)
950	{
951	acquire_time = g_last_gesturetime;
952
953	XSetSelectionOwner(g_display, primary_atom, g_wnd, acquire_time);
954	if (XGetSelectionOwner(g_display, primary_atom) != g_wnd)
955	warning("Failed to aquire ownership of PRIMARY clipboard\n");
956
957	XSetSelectionOwner(g_display, clipboard_atom, g_wnd, acquire_time);
958	if (XGetSelectionOwner(g_display, clipboard_atom) != g_wnd)
959	warning("Failed to aquire ownership of CLIPBOARD clipboard\n");
960
961	if (formats_data)
962	xfree(formats_data);
963	formats_data = xmalloc(length);
964	memcpy(formats_data, data, length);
965	formats_data_length = length;
966
967	xclip_notify_change();
968	}
969
970	/* Called when the RDP server responds with clipboard data (after we've requested it). */
971	void
972	ui_clip_handle_data(uint8 * data, uint32 length)
973	{
974	RD_BOOL free_data = False;
975
976	if (length == 0)
977	{
978	xclip_refuse_selection(&selection_request);
979	has_selection_request = False;
980	return;
981	}
982
983	if (selection_request.target == format_string_atom \|\| selection_request.target == XA_STRING)
984	{
985	/* We're expecting a CF_TEXT response */
986	uint8 *firstnull;
987
988	/* translate linebreaks */
989	crlf2lf(data, &length);
990
991	/* Only send data up to null byte, if any */
992	firstnull = (uint8 ) strchr((char ) data, '\0');
993	if (firstnull)
994	{
995	length = firstnull - data + 1;
996	}
997	}
998	#ifdef USE_UNICODE_CLIPBOARD
999	else if (selection_request.target == format_utf8_string_atom)
1000	{
1001	/* We're expecting a CF_UNICODETEXT response */
1002	iconv_t cd = iconv_open("UTF-8", WINDOWS_CODEPAGE);
1003	if (cd != (iconv_t) - 1)
1004	{
1005	size_t utf8_length = length * 2;
1006	char *utf8_data = malloc(utf8_length);
1007	size_t utf8_length_remaining = utf8_length;
1008	char *utf8_data_remaining = utf8_data;
1009	char data_remaining = (char ) data;
1010	size_t length_remaining = (size_t) length;
1011	if (utf8_data == NULL)
1012	{
1013	iconv_close(cd);
1014	return;
1015	}
1016	iconv(cd, (ICONV_CONST char **) &data_remaining, &length_remaining,
1017	&utf8_data_remaining, &utf8_length_remaining);
1018	iconv_close(cd);
1019	free_data = True;
1020	data = (uint8 *) utf8_data;
1021	length = utf8_length - utf8_length_remaining;
1022	/* translate linebreaks (works just as well on UTF-8) */
1023	crlf2lf(data, &length);
1024	}
1025	}
1026	else if (selection_request.target == format_unicode_atom)
1027	{
1028	/* We're expecting a CF_UNICODETEXT response, so what we're
1029	receiving matches our requirements and there's no need
1030	for further conversions. */
1031	}
1032	#endif
1033	else if (selection_request.target == rdesktop_native_atom)
1034	{
1035	/* Pass as-is */
1036	}
1037	else
1038	{
1039	DEBUG_CLIPBOARD(("ui_clip_handle_data: BUG! I don't know how to convert selection target %s!\n", XGetAtomName(g_display, selection_request.target)));
1040	xclip_refuse_selection(&selection_request);
1041	has_selection_request = False;
1042	return;
1043	}
1044
1045	xclip_provide_selection(&selection_request, selection_request.target, 8, data, length - 1);
1046	has_selection_request = False;
1047
1048	if (free_data)
1049	free(data);
1050	}
1051
1052	void
1053	ui_clip_request_failed()
1054	{
1055	xclip_refuse_selection(&selection_request);
1056	has_selection_request = False;
1057	}
1058
1059	void
1060	ui_clip_request_data(uint32 format)
1061	{
1062	Window primary_owner, clipboard_owner;
1063
1064	DEBUG_CLIPBOARD(("Request from server for format %d\n", format));
1065	rdp_clipboard_request_format = format;
1066
1067	if (probing_selections)
1068	{
1069	DEBUG_CLIPBOARD(("ui_clip_request_data: Selection probe in progress. Cannot handle request.\n"));
1070	helper_cliprdr_send_empty_response();
1071	return;
1072	}
1073
1074	xclip_clear_target_props();
1075
1076	if (rdesktop_is_selection_owner)
1077	{
1078	XChangeProperty(g_display, g_wnd, rdesktop_clipboard_target_atom,
1079	XA_INTEGER, 32, PropModeReplace, (unsigned char *) &format, 1);
1080
1081	XConvertSelection(g_display, primary_atom, rdesktop_native_atom,
1082	rdesktop_clipboard_target_atom, g_wnd, CurrentTime);
1083	return;
1084	}
1085
1086	if (auto_mode)
1087	primary_owner = XGetSelectionOwner(g_display, primary_atom);
1088	else
1089	primary_owner = None;
1090
1091	clipboard_owner = XGetSelectionOwner(g_display, clipboard_atom);
1092
1093	/* Both available */
1094	if ((primary_owner != None) && (clipboard_owner != None))
1095	{
1096	primary_timestamp = 0;
1097	clipboard_timestamp = 0;
1098	XConvertSelection(g_display, primary_atom, timestamp_atom,
1099	rdesktop_primary_timestamp_target_atom, g_wnd, CurrentTime);
1100	XConvertSelection(g_display, clipboard_atom, timestamp_atom,
1101	rdesktop_clipboard_timestamp_target_atom, g_wnd, CurrentTime);
1102	return;
1103	}
1104
1105	/* Just PRIMARY */
1106	if (primary_owner != None)
1107	{
1108	XConvertSelection(g_display, primary_atom, targets_atom,
1109	rdesktop_clipboard_target_atom, g_wnd, CurrentTime);
1110	return;
1111	}
1112
1113	/* Just CLIPBOARD */
1114	if (clipboard_owner != None)
1115	{
1116	XConvertSelection(g_display, clipboard_atom, targets_atom,
1117	rdesktop_clipboard_target_atom, g_wnd, CurrentTime);
1118	return;
1119	}
1120
1121	/* No data available */
1122	helper_cliprdr_send_empty_response();
1123	}
1124
1125	void
1126	ui_clip_sync(void)
1127	{
1128	xclip_probe_selections();
1129	}
1130
1131	void
1132	ui_clip_set_mode(const char *optarg)
1133	{
1134	g_rdpclip = True;
1135
1136	if (str_startswith(optarg, "PRIMARYCLIPBOARD"))
1137	auto_mode = True;
1138	else if (str_startswith(optarg, "CLIPBOARD"))
1139	auto_mode = False;
1140	else
1141	{
1142	warning("Invalid clipboard mode '%s'.\n", optarg);
1143	g_rdpclip = False;
1144	}
1145	}
1146
1147	void
1148	xclip_init(void)
1149	{
1150	if (!g_rdpclip)
1151	return;
1152
1153	if (!cliprdr_init())
1154	return;
1155
1156	primary_atom = XInternAtom(g_display, "PRIMARY", False);
1157	clipboard_atom = XInternAtom(g_display, "CLIPBOARD", False);
1158	targets_atom = XInternAtom(g_display, "TARGETS", False);
1159	timestamp_atom = XInternAtom(g_display, "TIMESTAMP", False);
1160	rdesktop_clipboard_target_atom =
1161	XInternAtom(g_display, "_RDESKTOP_CLIPBOARD_TARGET", False);
1162	rdesktop_primary_timestamp_target_atom =
1163	XInternAtom(g_display, "_RDESKTOP_PRIMARY_TIMESTAMP_TARGET", False);
1164	rdesktop_clipboard_timestamp_target_atom =
1165	XInternAtom(g_display, "_RDESKTOP_CLIPBOARD_TIMESTAMP_TARGET", False);
1166	incr_atom = XInternAtom(g_display, "INCR", False);
1167	format_string_atom = XInternAtom(g_display, "STRING", False);
1168	format_utf8_string_atom = XInternAtom(g_display, "UTF8_STRING", False);
1169	format_unicode_atom = XInternAtom(g_display, "text/unicode", False);
1170
1171	/* rdesktop sets _RDESKTOP_SELECTION_NOTIFY on the root window when acquiring the clipboard.
1172	Other interested rdesktops can use this to notify their server of the available formats. */
1173	rdesktop_selection_notify_atom =
1174	XInternAtom(g_display, "_RDESKTOP_SELECTION_NOTIFY", False);
1175	XSelectInput(g_display, DefaultRootWindow(g_display), PropertyChangeMask);
1176	probing_selections = False;
1177
1178	rdesktop_native_atom = XInternAtom(g_display, "_RDESKTOP_NATIVE", False);
1179	rdesktop_clipboard_formats_atom =
1180	XInternAtom(g_display, "_RDESKTOP_CLIPBOARD_FORMATS", False);
1181	rdesktop_primary_owner_atom = XInternAtom(g_display, "_RDESKTOP_PRIMARY_OWNER", False);
1182	rdesktop_clipboard_owner_atom = XInternAtom(g_display, "_RDESKTOP_CLIPBOARD_OWNER", False);
1183
1184	num_targets = 0;
1185	targets[num_targets++] = targets_atom;
1186	targets[num_targets++] = timestamp_atom;
1187	targets[num_targets++] = rdesktop_native_atom;
1188	targets[num_targets++] = rdesktop_clipboard_formats_atom;
1189	#ifdef USE_UNICODE_CLIPBOARD
1190	targets[num_targets++] = format_utf8_string_atom;
1191	#endif
1192	targets[num_targets++] = format_unicode_atom;
1193	targets[num_targets++] = format_string_atom;
1194	targets[num_targets++] = XA_STRING;
1195	}
1196
1197	void
1198	xclip_deinit(void)
1199	{
1200	if (XGetSelectionOwner(g_display, primary_atom) == g_wnd)
1201	XSetSelectionOwner(g_display, primary_atom, None, acquire_time);
1202	if (XGetSelectionOwner(g_display, clipboard_atom) == g_wnd)
1203	XSetSelectionOwner(g_display, clipboard_atom, None, acquire_time);
1204	xclip_notify_change();
1205	}

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source: vbox/trunk/src/VBox/RDP/client/xclip.c@ 13351

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