summaryrefslogtreecommitdiff
path: root/hw/xwin/winclipboardwrappers.c
blob: 8801f6c42b6b7e6992f2e5d57e4ab7c5a523c667 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
/*
 *Copyright (C) 2003-2004 Harold L Hunt II All Rights Reserved.
 *
 *Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 *"Software"), to deal in the Software without restriction, including
 *without limitation the rights to use, copy, modify, merge, publish,
 *distribute, sublicense, and/or sell copies of the Software, and to
 *permit persons to whom the Software is furnished to do so, subject to
 *the following conditions:
 *
 *The above copyright notice and this permission notice shall be
 *included in all copies or substantial portions of the Software.
 *
 *THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 *MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *NONINFRINGEMENT. IN NO EVENT SHALL HAROLD L HUNT II BE LIABLE FOR
 *ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
 *CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 *WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 *Except as contained in this notice, the name of Harold L Hunt II
 *shall not be used in advertising or otherwise to promote the sale, use
 *or other dealings in this Software without prior written authorization
 *from Harold L Hunt II.
 *
 * Authors:	Harold L Hunt II
 */

#ifdef HAVE_XWIN_CONFIG_H
#include <xwin-config.h>
#endif
#include "win.h"
#include "dixstruct.h"
#include <X11/Xatom.h>


/*
 * Constants
 */

#define CLIP_NUM_SELECTIONS		2
#define CLIP_OWN_PRIMARY		0
#define CLIP_OWN_CLIPBOARD		1


/*
 * Local function prototypes
 */

DISPATCH_PROC(winProcEstablishConnection);
DISPATCH_PROC(winProcQueryTree);
DISPATCH_PROC(winProcSetSelectionOwner);


/*
 * References to external symbols
 */

extern Bool		g_fUnicodeSupport;
extern int		g_iNumScreens;
extern unsigned int	g_uiAuthDataLen;
extern char		*g_pAuthData;
extern Bool		g_fXdmcpEnabled;
extern Bool		g_fClipboardLaunched;
extern Bool		g_fClipboardStarted;
extern Bool		g_fClipboard;
extern Window		g_iClipboardWindow;
extern Atom		g_atomLastOwnedSelection;
extern HWND		g_hwndClipboard;

extern winDispatchProcPtr	winProcEstablishConnectionOrig;
extern winDispatchProcPtr	winProcQueryTreeOrig;
extern winDispatchProcPtr	winProcSetSelectionOwnerOrig;


/*
 * Wrapper for internal QueryTree function.
 * Hides the clipboard client when it is the only client remaining.
 */

int
winProcQueryTree (ClientPtr client)
{
  int			iReturn;

  /*
   * This procedure is only used for initialization.
   * We can unwrap the original procedure at this point
   * so that this function is no longer called until the
   * server resets and the function is wrapped again.
   */
  ProcVector[X_QueryTree] = winProcQueryTreeOrig;

  /*
   * Call original function and bail if it fails.
   * NOTE: We must do this first, since we need XdmcpOpenDisplay
   * to be called before we initialize our clipboard client.
   */
  iReturn = (*winProcQueryTreeOrig) (client);
  if (iReturn != 0)
    {
      ErrorF ("winProcQueryTree - ProcQueryTree failed, bailing.\n");
      return iReturn;
    }

  /* Make errors more obvious */
  winProcQueryTreeOrig = NULL;

  /* Do nothing if clipboard is not enabled */
  if (!g_fClipboard)
    {
      ErrorF ("winProcQueryTree - Clipboard is not enabled, "
	      "returning.\n");
      return iReturn;
    }

  /* If the clipboard client has already been started, abort */
  if (g_fClipboardLaunched)
    {
      ErrorF ("winProcQueryTree - Clipboard client already "
	      "launched, returning.\n");
      return iReturn;
    }

  /* Startup the clipboard client if clipboard mode is being used */
  if (g_fXdmcpEnabled && g_fClipboard)
    {
      /*
       * NOTE: The clipboard client is started here for a reason:
       * 1) Assume you are using XDMCP (e.g. XWin -query %hostname%)
       * 2) If the clipboard client attaches during X Server startup,
       *    then it becomes the "magic client" that causes the X Server
       *    to reset if it exits.
       * 3) XDMCP calls KillAllClients when it starts up.
       * 4) The clipboard client is a client, so it is killed.
       * 5) The clipboard client is the "magic client", so the X Server
       *    resets itself.
       * 6) This repeats ad infinitum.
       * 7) We avoid this by waiting until at least one client (could
       *    be XDM, could be another client) connects, which makes it
       *    almost certain that the clipboard client will not connect
       *    until after XDM when using XDMCP.
       * 8) Unfortunately, there is another problem.
       * 9) XDM walks the list of windows with XQueryTree,
       *    killing any client it finds with a window.
       * 10)Thus, when using XDMCP we wait until the first call
       *    to ProcQueryTree before we startup the clipboard client.
       *    This should prevent XDM from finding the clipboard client,
       *    since it has not yet created a window.
       * 11)Startup when not using XDMCP is handled in
       *    winProcEstablishConnection.
       */
      
      /* Create the clipboard client thread */
      if (!winInitClipboard ())
	{
	  ErrorF ("winProcQueryTree - winClipboardInit "
		  "failed.\n");
	  return iReturn;
	}
      
      ErrorF ("winProcQueryTree - winInitClipboard returned.\n");
    }
  
  /* Flag that clipboard client has been launched */
  g_fClipboardLaunched = TRUE;

  return iReturn;
}


/*
 * Wrapper for internal EstablishConnection function.
 * Initializes internal clients that must not be started until
 * an external client has connected.
 */

int
winProcEstablishConnection (ClientPtr client)
{
  int			iReturn;
  static int		s_iCallCount = 0;
  static unsigned long	s_ulServerGeneration = 0;

  ErrorF ("winProcEstablishConnection - Hello\n");

  /* Do nothing if clipboard is not enabled */
  if (!g_fClipboard)
    {
      ErrorF ("winProcEstablishConnection - Clipboard is not enabled, "
	      "returning.\n");
      
      /* Unwrap the original function, call it, and return */
      InitialVector[2] = winProcEstablishConnectionOrig;
      iReturn = (*winProcEstablishConnectionOrig) (client);
      winProcEstablishConnectionOrig = NULL;
      return iReturn;
    }

  /* Watch for server reset */
  if (s_ulServerGeneration != serverGeneration)
    {
      /* Save new generation number */
      s_ulServerGeneration = serverGeneration;

      /* Reset call count */
      s_iCallCount = 0;
    }

  /* Increment call count */
  ++s_iCallCount;

  /* Wait for second call when Xdmcp is enabled */
  if (g_fXdmcpEnabled
      && !g_fClipboardLaunched
      && s_iCallCount < 4)
    {
      ErrorF ("winProcEstablishConnection - Xdmcp enabled, waiting to "
	      "start clipboard client until fourth call.\n");
      return (*winProcEstablishConnectionOrig) (client);
    }

  /*
   * This procedure is only used for initialization.
   * We can unwrap the original procedure at this point
   * so that this function is no longer called until the
   * server resets and the function is wrapped again.
   */
  InitialVector[2] = winProcEstablishConnectionOrig;

  /*
   * Call original function and bail if it fails.
   * NOTE: We must do this first, since we need XdmcpOpenDisplay
   * to be called before we initialize our clipboard client.
   */
  iReturn = (*winProcEstablishConnectionOrig) (client);
  if (iReturn != 0)
    {
      ErrorF ("winProcEstablishConnection - ProcEstablishConnection "
	      "failed, bailing.\n");
      return iReturn;
    }

  /* Clear original function pointer */
  winProcEstablishConnectionOrig = NULL;

  /* If the clipboard client has already been started, abort */
  if (g_fClipboardLaunched)
    {
      ErrorF ("winProcEstablishConnection - Clipboard client already "
	      "launched, returning.\n");
      return iReturn;
    }

  /* Startup the clipboard client if clipboard mode is being used */
  if (g_fClipboard)
    {
      /*
       * NOTE: The clipboard client is started here for a reason:
       * 1) Assume you are using XDMCP (e.g. XWin -query %hostname%)
       * 2) If the clipboard client attaches during X Server startup,
       *    then it becomes the "magic client" that causes the X Server
       *    to reset if it exits.
       * 3) XDMCP calls KillAllClients when it starts up.
       * 4) The clipboard client is a client, so it is killed.
       * 5) The clipboard client is the "magic client", so the X Server
       *    resets itself.
       * 6) This repeats ad infinitum.
       * 7) We avoid this by waiting until at least one client (could
       *    be XDM, could be another client) connects, which makes it
       *    almost certain that the clipboard client will not connect
       *    until after XDM when using XDMCP.
       * 8) Unfortunately, there is another problem.
       * 9) XDM walks the list of windows with XQueryTree,
       *    killing any client it finds with a window.
       * 10)Thus, when using XDMCP we wait until the second call
       *    to ProcEstablishCeonnection before we startup the clipboard
       *    client.  This should prevent XDM from finding the clipboard
       *    client, since it has not yet created a window.
       */
      
      /* Create the clipboard client thread */
      if (!winInitClipboard ())
	{
	  ErrorF ("winProcEstablishConnection - winClipboardInit "
		  "failed.\n");
	  return iReturn;
	}
      
      ErrorF ("winProcEstablishConnection - winInitClipboard returned.\n");
    }
  
  /* Flag that clipboard client has been launched */
  g_fClipboardLaunched = TRUE;

  return iReturn;
}


/*
 * Wrapper for internal SetSelectionOwner function.
 * Grabs ownership of Windows clipboard when X11 clipboard owner changes.
 */

int
winProcSetSelectionOwner (ClientPtr client)
{
  int			i;
  DrawablePtr		pDrawable;
  WindowPtr		pWindow = None;
  Bool			fOwnedToNotOwned = FALSE;
  static Window		s_iOwners[CLIP_NUM_SELECTIONS] = {None};
  static unsigned long	s_ulServerGeneration = 0;
  REQUEST(xSetSelectionOwnerReq);
  
  REQUEST_SIZE_MATCH(xSetSelectionOwnerReq);

#if 0
  ErrorF ("winProcSetSelectionOwner - Hello.\n");
#endif

  /* Watch for server reset */
  if (s_ulServerGeneration != serverGeneration)
    {
      /* Save new generation number */
      s_ulServerGeneration = serverGeneration;

      /* Initialize static variables */
      for (i = 0; i < CLIP_NUM_SELECTIONS; ++i)
	s_iOwners[i] = None;
    }

  /* Abort if clipboard not completely initialized yet */
  if (!g_fClipboardStarted)
    {
      ErrorF ("winProcSetSelectionOwner - Clipboard not yet started, "
	      "aborting.\n");
      goto winProcSetSelectionOwner_Done;
    }
  
  /* Grab window if we have one */
  if (None != stuff->window)
    {
      /* Grab the Window from the request */
      pWindow = (WindowPtr) SecurityLookupWindow (stuff->window, client,
						  SecurityReadAccess);
      if (!pWindow)
	{
	  ErrorF ("winProcSetSelectionOwner - Found BadWindow, aborting.\n");
	  goto winProcSetSelectionOwner_Done;
	}
    }

  /* Now we either have a valid window or None */

  /* Save selection owners for monitored selections, ignore other selections */
  if (XA_PRIMARY == stuff->selection)
    {
      /* Look for owned -> not owned transition */
      if (None == stuff->window
	  && None != s_iOwners[CLIP_OWN_PRIMARY])
	{
	  fOwnedToNotOwned = TRUE;

#if 0
	  ErrorF ("winProcSetSelectionOwner - PRIMARY - Going from "
		  "owned to not owned.\n");
#endif

	  /* Adjust last owned selection */
	  if (None != s_iOwners[CLIP_OWN_CLIPBOARD])
	    g_atomLastOwnedSelection = MakeAtom ("CLIPBOARD", 9, TRUE);
	  else
	    g_atomLastOwnedSelection = None;
	}
      
      /* Save new selection owner or None */
      s_iOwners[CLIP_OWN_PRIMARY] = stuff->window;

#if 0
      ErrorF ("winProcSetSelectionOwner - PRIMARY - Now owned by: %d\n",
	      stuff->window);
#endif
    }
  else if (MakeAtom ("CLIPBOARD", 9, TRUE) == stuff->selection)
    {
      /* Look for owned -> not owned transition */
      if (None == stuff->window
	  && None != s_iOwners[CLIP_OWN_CLIPBOARD])
	{
	  fOwnedToNotOwned = TRUE;
	  
#if 0
	  ErrorF ("winProcSetSelectionOwner - CLIPBOARD - Going from "
		  "owned to not owned.\n");
#endif

	  /* Adjust last owned selection */
	  if (None != s_iOwners[CLIP_OWN_PRIMARY])
	    g_atomLastOwnedSelection = XA_PRIMARY;
	  else
	    g_atomLastOwnedSelection = None;
	}
      
      /* Save new selection owner or None */
      s_iOwners[CLIP_OWN_CLIPBOARD] = stuff->window;

#if 0
      ErrorF ("winProcSetSelectionOwner - CLIPBOARD - Now owned by: %d\n",
	      stuff->window);
#endif
    }
  else
    goto winProcSetSelectionOwner_Done;

  /*
   * At this point, if one of the selections is still owned by the 
   * clipboard manager then it should be marked as unowned since
   * we will be taking ownership of the Win32 clipboard.
   */
  if (g_iClipboardWindow == s_iOwners[CLIP_OWN_PRIMARY])
    s_iOwners[CLIP_OWN_PRIMARY] = None;
  if (g_iClipboardWindow == s_iOwners[CLIP_OWN_CLIPBOARD])
    s_iOwners[CLIP_OWN_CLIPBOARD] = None;

  /*
   * Handle case when selection is being disowned,
   * WM_DRAWCLIPBOARD did not do the disowning,
   * both monitored selections are no longer owned,
   * an owned to not owned transition was detected,
   * and we currently own the Win32 clipboard.
   */
  if (None == stuff->window
      && g_iClipboardWindow != client->lastDrawableID
      && (None == s_iOwners[CLIP_OWN_PRIMARY]
	  || g_iClipboardWindow == s_iOwners[CLIP_OWN_PRIMARY])
      && (None == s_iOwners[CLIP_OWN_CLIPBOARD]
	  || g_iClipboardWindow == s_iOwners[CLIP_OWN_CLIPBOARD])
      && fOwnedToNotOwned
      && g_hwndClipboard != NULL
      && g_hwndClipboard == GetClipboardOwner ())
    {
#if 0
      ErrorF ("winProcSetSelectionOwner - We currently own the "
	      "clipboard and neither the PRIMARY nor the CLIPBOARD "
	      "selections are owned, releasing ownership of Win32 "
	      "clipboard.\n");
#endif
      
      /* Release ownership of the Windows clipboard */
      OpenClipboard (NULL);
      EmptyClipboard ();
      CloseClipboard ();

      /* Clear X selection ownership (might still be marked as us owning) */
      s_iOwners[CLIP_OWN_PRIMARY] = None;
      s_iOwners[CLIP_OWN_CLIPBOARD] = None;
      
      goto winProcSetSelectionOwner_Done;
    }

  /* Abort if no window at this point */
  if (None == stuff->window)
    {
#if 0
      ErrorF ("winProcSetSelectionOwner - No window, returning.\n");
#endif
      goto winProcSetSelectionOwner_Done;
    }

  /* Abort if invalid selection */
  if (!ValidAtom (stuff->selection))
    {
      ErrorF ("winProcSetSelectionOwner - Found BadAtom, aborting.\n");
      goto winProcSetSelectionOwner_Done;
    }

  /* Cast Window to Drawable */
  pDrawable = (DrawablePtr) pWindow;
  
  /* Abort if clipboard manager is owning the selection */
  if (pDrawable->id == g_iClipboardWindow)
    {
#if 0
      ErrorF ("winProcSetSelectionOwner - We changed ownership, "
	      "aborting.\n");
#endif
      goto winProcSetSelectionOwner_Done;
    }

  /* Abort if root window is taking ownership */
  if (pDrawable->id == 0)
    {
      ErrorF ("winProcSetSelectionOwner - Root window taking ownership, "
	      "aborting\n");
      goto winProcSetSelectionOwner_Done;
    }

  /* Close clipboard if we have it open already */
  if (GetOpenClipboardWindow () == g_hwndClipboard)
    {
      CloseClipboard ();
    }

  /* Access the Windows clipboard */
  if (!OpenClipboard (g_hwndClipboard))
    {
      ErrorF ("winProcSetSelectionOwner - OpenClipboard () failed: %08x\n",
	      (int) GetLastError ());
      goto winProcSetSelectionOwner_Done;
    }

  /* Take ownership of the Windows clipboard */
  if (!EmptyClipboard ())
    {
      ErrorF ("winProcSetSelectionOwner - EmptyClipboard () failed: %08x\n",
	      (int) GetLastError ());
      goto winProcSetSelectionOwner_Done;
    }

  /* Advertise Unicode if we support it */
  if (g_fUnicodeSupport)
    SetClipboardData (CF_UNICODETEXT, NULL);

  /* Always advertise regular text */
  SetClipboardData (CF_TEXT, NULL);

  /* Save handle to last owned selection */
  g_atomLastOwnedSelection = stuff->selection;

  /* Release the clipboard */
  if (!CloseClipboard ())
    {
      ErrorF ("winProcSetSelectionOwner - CloseClipboard () failed: "
	      "%08x\n",
	      (int) GetLastError ());
      goto winProcSetSelectionOwner_Done;
    }

 winProcSetSelectionOwner_Done:
  return (*winProcSetSelectionOwnerOrig) (client);
}