server/winstation.c

   1 /*
   2  * Server-side window stations and desktops handling
   3  *
   4  * Copyright (C) 2002, 2005 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <stdio.h>
  25 #include <stdarg.h>
  26
  27 #include "ntstatus.h"
  28 #define WIN32_NO_STATUS
  29 #include "windef.h"
  30 #include "winbase.h"
  31 #include "winuser.h"
  32 #include "winternl.h"
  33
  34 #include "object.h"
  35 #include "handle.h"
  36 #include "request.h"
  37 #include "process.h"
  38 #include "user.h"
  39 #include "file.h"
  40 #include "wine/unicode.h"
  41
  42
  43 static struct list winstation_list = LIST_INIT(winstation_list);
  44 static struct namespace *winstation_namespace;
  45
  46 static void winstation_dump( struct object *obj, int verbose );
  47 static int winstation_close_handle( struct object *obj, struct process *process, obj_handle_t handle );
  48 static void winstation_destroy( struct object *obj );
  49 static unsigned int winstation_map_access( struct object *obj, unsigned int access );
  50 static void desktop_dump( struct object *obj, int verbose );
  51 static int desktop_close_handle( struct object *obj, struct process *process, obj_handle_t handle );
  52 static void desktop_destroy( struct object *obj );
  53 static unsigned int desktop_map_access( struct object *obj, unsigned int access );
  54
  55 static const struct object_ops winstation_ops =
  56 {
  57     sizeof(struct winstation),    /* size */
  58     winstation_dump,              /* dump */
  59     no_add_queue,                 /* add_queue */
  60     NULL,                         /* remove_queue */
  61     NULL,                         /* signaled */
  62     NULL,                         /* satisfied */
  63     no_signal,                    /* signal */
  64     no_get_fd,                    /* get_fd */
  65     winstation_map_access,        /* map_access */
  66     no_lookup_name,               /* lookup_name */
  67     no_open_file,                 /* open_file */
  68     winstation_close_handle,      /* close_handle */
  69     winstation_destroy            /* destroy */
  70 };
  71
  72
  73 static const struct object_ops desktop_ops =
  74 {
  75     sizeof(struct desktop),       /* size */
  76     desktop_dump,                 /* dump */
  77     no_add_queue,                 /* add_queue */
  78     NULL,                         /* remove_queue */
  79     NULL,                         /* signaled */
  80     NULL,                         /* satisfied */
  81     no_signal,                    /* signal */
  82     no_get_fd,                    /* get_fd */
  83     desktop_map_access,           /* map_access */
  84     no_lookup_name,               /* lookup_name */
  85     no_open_file,                 /* open_file */
  86     desktop_close_handle,         /* close_handle */
  87     desktop_destroy               /* destroy */
  88 };
  89
  90 #define DESKTOP_ALL_ACCESS 0x01ff
  91
  92 /* create a winstation object */
  93 static struct winstation *create_winstation( const struct unicode_str *name, unsigned int attr,
  94                                              unsigned int flags )
  95 {
  96     struct winstation *winstation;
  97
  98     if (!winstation_namespace && !(winstation_namespace = create_namespace( 7 )))
  99         return NULL;
 100
 101     if (memchrW( name->str, '\\', name->len / sizeof(WCHAR) ))  /* no backslash allowed in name */
 102     {
 103         set_error( STATUS_INVALID_PARAMETER );
 104         return NULL;
 105     }
 106
 107     if ((winstation = create_named_object( winstation_namespace, &winstation_ops, name, attr )))
 108     {
 109         if (get_error() != STATUS_OBJECT_NAME_EXISTS)
 110         {
 111             /* initialize it if it didn't already exist */
 112             winstation->flags = flags;
 113             winstation->clipboard = NULL;
 114             winstation->atom_table = NULL;
 115             list_add_tail( &winstation_list, &winstation->entry );
 116             list_init( &winstation->desktops );
 117         }
 118     }
 119     return winstation;
 120 }
 121
 122 static void winstation_dump( struct object *obj, int verbose )
 123 {
 124     struct winstation *winstation = (struct winstation *)obj;
 125
 126     fprintf( stderr, "Winstation flags=%x clipboard=%p atoms=%p ",
 127              winstation->flags, winstation->clipboard, winstation->atom_table );
 128     dump_object_name( &winstation->obj );
 129     fputc( '\n', stderr );
 130 }
 131
 132 static int winstation_close_handle( struct object *obj, struct process *process, obj_handle_t handle )
 133 {
 134     return (process->winstation != handle);
 135 }
 136
 137 static void winstation_destroy( struct object *obj )
 138 {
 139     struct winstation *winstation = (struct winstation *)obj;
 140
 141     list_remove( &winstation->entry );
 142     if (winstation->clipboard) release_object( winstation->clipboard );
 143     if (winstation->atom_table) release_object( winstation->atom_table );
 144 }
 145
 146 static unsigned int winstation_map_access( struct object *obj, unsigned int access )
 147 {
 148     if (access & GENERIC_READ)    access |= STANDARD_RIGHTS_READ | WINSTA_ENUMDESKTOPS | WINSTA_READATTRIBUTES |
 149                                             WINSTA_ENUMERATE | WINSTA_READSCREEN;
 150     if (access & GENERIC_WRITE)   access |= STANDARD_RIGHTS_WRITE | WINSTA_ACCESSCLIPBOARD | WINSTA_CREATEDESKTOP |
 151                                             WINSTA_WRITEATTRIBUTES;
 152     if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE | WINSTA_ACCESSGLOBALATOMS | WINSTA_EXITWINDOWS;
 153     if (access & GENERIC_ALL)     access |= STANDARD_RIGHTS_REQUIRED | WINSTA_ALL_ACCESS;
 154     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 155 }
 156
 157 /* retrieve the process window station, checking the handle access rights */
 158 struct winstation *get_process_winstation( struct process *process, unsigned int access )
 159 {
 160     return (struct winstation *)get_handle_obj( process, process->winstation,
 161                                                 access, &winstation_ops );
 162 }
 163
 164 /* build the full name of a desktop object */
 165 static WCHAR *build_desktop_name( const struct unicode_str *name,
 166                                   struct winstation *winstation, struct unicode_str *res )
 167 {
 168     const WCHAR *winstation_name;
 169     WCHAR *full_name;
 170     data_size_t winstation_len;
 171
 172     if (memchrW( name->str, '\\', name->len / sizeof(WCHAR) ))
 173     {
 174         set_error( STATUS_INVALID_PARAMETER );
 175         return NULL;
 176     }
 177
 178     if (!(winstation_name = get_object_name( &winstation->obj, &winstation_len )))
 179         winstation_len = 0;
 180
 181     res->len = winstation_len + name->len + sizeof(WCHAR);
 182     if (!(full_name = mem_alloc( res->len ))) return NULL;
 183     memcpy( full_name, winstation_name, winstation_len );
 184     full_name[winstation_len / sizeof(WCHAR)] = '\\';
 185     memcpy( full_name + winstation_len / sizeof(WCHAR) + 1, name->str, name->len );
 186     res->str = full_name;
 187     return full_name;
 188 }
 189
 190 /* retrieve a pointer to a desktop object */
 191 static inline struct desktop *get_desktop_obj( struct process *process, obj_handle_t handle,
 192                                                unsigned int access )
 193 {
 194     return (struct desktop *)get_handle_obj( process, handle, access, &desktop_ops );
 195 }
 196
 197 /* create a desktop object */
 198 static struct desktop *create_desktop( const struct unicode_str *name, unsigned int attr,
 199                                        unsigned int flags, struct winstation *winstation )
 200 {
 201     struct desktop *desktop;
 202     struct unicode_str full_str;
 203     WCHAR *full_name;
 204
 205     if (!(full_name = build_desktop_name( name, winstation, &full_str ))) return NULL;
 206
 207     if ((desktop = create_named_object( winstation_namespace, &desktop_ops, &full_str, attr )))
 208     {
 209         if (get_error() != STATUS_OBJECT_NAME_EXISTS)
 210         {
 211             /* initialize it if it didn't already exist */
 212             desktop->flags = flags;
 213             desktop->winstation = (struct winstation *)grab_object( winstation );
 214             desktop->top_window = NULL;
 215             desktop->global_hooks = NULL;
 216             desktop->close_timeout = NULL;
 217             desktop->users = 0;
 218             list_add_tail( &winstation->desktops, &desktop->entry );
 219         }
 220     }
 221     free( full_name );
 222     return desktop;
 223 }
 224
 225 static void desktop_dump( struct object *obj, int verbose )
 226 {
 227     struct desktop *desktop = (struct desktop *)obj;
 228
 229     fprintf( stderr, "Desktop flags=%x winstation=%p top_win=%p hooks=%p ",
 230              desktop->flags, desktop->winstation, desktop->top_window, desktop->global_hooks );
 231     dump_object_name( &desktop->obj );
 232     fputc( '\n', stderr );
 233 }
 234
 235 static int desktop_close_handle( struct object *obj, struct process *process, obj_handle_t handle )
 236 {
 237     struct thread *thread;
 238
 239     /* check if the handle is currently used by the process or one of its threads */
 240     if (process->desktop == handle) return 0;
 241     LIST_FOR_EACH_ENTRY( thread, &process->thread_list, struct thread, proc_entry )
 242         if (thread->desktop == handle) return 0;
 243     return 1;
 244 }
 245
 246 static void desktop_destroy( struct object *obj )
 247 {
 248     struct desktop *desktop = (struct desktop *)obj;
 249
 250     if (desktop->top_window) destroy_window( desktop->top_window );
 251     if (desktop->global_hooks) release_object( desktop->global_hooks );
 252     if (desktop->close_timeout) remove_timeout_user( desktop->close_timeout );
 253     list_remove( &desktop->entry );
 254     release_object( desktop->winstation );
 255 }
 256
 257 static unsigned int desktop_map_access( struct object *obj, unsigned int access )
 258 {
 259     if (access & GENERIC_READ)    access |= STANDARD_RIGHTS_READ | DESKTOP_READOBJECTS | DESKTOP_ENUMERATE;
 260     if (access & GENERIC_WRITE)   access |= STANDARD_RIGHTS_WRITE | DESKTOP_CREATEMENU | DESKTOP_CREATEWINDOW |
 261                                             DESKTOP_HOOKCONTROL | DESKTOP_JOURNALRECORD | DESKTOP_JOURNALPLAYBACK |
 262                                             DESKTOP_WRITEOBJECTS;
 263     if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE | DESKTOP_SWITCHDESKTOP;
 264     if (access & GENERIC_ALL)     access |= STANDARD_RIGHTS_REQUIRED | DESKTOP_ALL_ACCESS;
 265     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 266 }
 267
 268 /* retrieve the thread desktop, checking the handle access rights */
 269 struct desktop *get_thread_desktop( struct thread *thread, unsigned int access )
 270 {
 271     return get_desktop_obj( thread->process, thread->desktop, access );
 272 }
 273
 274 /* set the process default desktop handle */
 275 void set_process_default_desktop( struct process *process, struct desktop *desktop,
 276                                   obj_handle_t handle )
 277 {
 278     struct thread *thread;
 279     struct desktop *old_desktop;
 280
 281     if (process->desktop == handle) return;  /* nothing to do */
 282
 283     if (!(old_desktop = get_desktop_obj( process, process->desktop, 0 ))) clear_error();
 284     process->desktop = handle;
 285
 286     /* set desktop for threads that don't have one yet */
 287     LIST_FOR_EACH_ENTRY( thread, &process->thread_list, struct thread, proc_entry )
 288         if (!thread->desktop) thread->desktop = handle;
 289
 290     desktop->users++;
 291     if (desktop->close_timeout)
 292     {
 293         remove_timeout_user( desktop->close_timeout );
 294         desktop->close_timeout = NULL;
 295     }
 296     if (old_desktop)
 297     {
 298         old_desktop->users--;
 299         release_object( old_desktop );
 300     }
 301 }
 302
 303 /* connect a process to its window station */
 304 void connect_process_winstation( struct process *process, struct thread *parent )
 305 {
 306     struct winstation *winstation = NULL;
 307     struct desktop *desktop = NULL;
 308     obj_handle_t handle;
 309
 310     /* check for an inherited winstation handle (don't ask...) */
 311     if ((handle = find_inherited_handle( process, &winstation_ops )))
 312     {
 313         winstation = (struct winstation *)get_handle_obj( process, handle, 0, &winstation_ops );
 314     }
 315     else if (parent && parent->process->winstation)
 316     {
 317         handle = duplicate_handle( parent->process, parent->process->winstation,
 318                                    process, 0, 0, DUP_HANDLE_SAME_ACCESS );
 319         winstation = (struct winstation *)get_handle_obj( process, handle, 0, &winstation_ops );
 320     }
 321     if (!winstation) goto done;
 322     process->winstation = handle;
 323
 324     if ((handle = find_inherited_handle( process, &desktop_ops )))
 325     {
 326         desktop = get_desktop_obj( process, handle, 0 );
 327         if (!desktop || desktop->winstation != winstation) goto done;
 328     }
 329     else if (parent && parent->desktop)
 330     {
 331         desktop = get_desktop_obj( parent->process, parent->desktop, 0 );
 332         if (!desktop || desktop->winstation != winstation) goto done;
 333         handle = duplicate_handle( parent->process, parent->desktop,
 334                                    process, 0, 0, DUP_HANDLE_SAME_ACCESS );
 335     }
 336
 337     if (handle) set_process_default_desktop( process, desktop, handle );
 338
 339 done:
 340     if (desktop) release_object( desktop );
 341     if (winstation) release_object( winstation );
 342     clear_error();
 343 }
 344
 345 static void close_desktop_timeout( void *private )
 346 {
 347     struct desktop *desktop = private;
 348
 349     desktop->close_timeout = NULL;
 350     unlink_named_object( &desktop->obj );  /* make sure no other process can open it */
 351     close_desktop_window( desktop );  /* and signal the owner to quit */
 352 }
 353
 354 /* close the desktop of a given process */
 355 void close_process_desktop( struct process *process )
 356 {
 357     struct desktop *desktop;
 358
 359     if (process->desktop && (desktop = get_desktop_obj( process, process->desktop, 0 )))
 360     {
 361         assert( desktop->users > 0 );
 362         desktop->users--;
 363         /* if we have one remaining user, it has to be the manager of the desktop window */
 364         if (desktop->users == 1 && get_top_window_owner( desktop ))
 365         {
 366             assert( !desktop->close_timeout );
 367             desktop->close_timeout = add_timeout_user( -TICKS_PER_SEC, close_desktop_timeout, desktop );
 368         }
 369         release_object( desktop );
 370     }
 371     clear_error();  /* ignore errors */
 372 }
 373
 374 /* close the desktop of a given thread */
 375 void close_thread_desktop( struct thread *thread )
 376 {
 377     obj_handle_t handle = thread->desktop;
 378
 379     thread->desktop = 0;
 380     if (handle) close_handle( thread->process, handle );
 381     clear_error();  /* ignore errors */
 382 }
 383
 384
 385 /* create a window station */
 386 DECL_HANDLER(create_winstation)
 387 {
 388     struct winstation *winstation;
 389     struct unicode_str name;
 390
 391     reply->handle = 0;
 392     get_req_unicode_str( &name );
 393     if ((winstation = create_winstation( &name, req->attributes, req->flags )))
 394     {
 395         reply->handle = alloc_handle( current->process, winstation, req->access, req->attributes );
 396         release_object( winstation );
 397     }
 398 }
 399
 400 /* open a handle to a window station */
 401 DECL_HANDLER(open_winstation)
 402 {
 403     struct unicode_str name;
 404
 405     get_req_unicode_str( &name );
 406     if (winstation_namespace)
 407         reply->handle = open_object( winstation_namespace, &name, &winstation_ops, req->access,
 408                                      req->attributes );
 409     else
 410         set_error( STATUS_OBJECT_NAME_NOT_FOUND );
 411 }
 412
 413
 414 /* close a window station */
 415 DECL_HANDLER(close_winstation)
 416 {
 417     struct winstation *winstation;
 418
 419     if ((winstation = (struct winstation *)get_handle_obj( current->process, req->handle,
 420                                                            0, &winstation_ops )))
 421     {
 422         if (!close_handle( current->process, req->handle )) set_error( STATUS_ACCESS_DENIED );
 423         release_object( winstation );
 424     }
 425 }
 426
 427
 428 /* get the process current window station */
 429 DECL_HANDLER(get_process_winstation)
 430 {
 431     reply->handle = current->process->winstation;
 432 }
 433
 434
 435 /* set the process current window station */
 436 DECL_HANDLER(set_process_winstation)
 437 {
 438     struct winstation *winstation;
 439
 440     if ((winstation = (struct winstation *)get_handle_obj( current->process, req->handle,
 441                                                            0, &winstation_ops )))
 442     {
 443         /* FIXME: should we close the old one? */
 444         current->process->winstation = req->handle;
 445         release_object( winstation );
 446     }
 447 }
 448
 449 /* create a desktop */
 450 DECL_HANDLER(create_desktop)
 451 {
 452     struct desktop *desktop;
 453     struct winstation *winstation;
 454     struct unicode_str name;
 455
 456     reply->handle = 0;
 457     get_req_unicode_str( &name );
 458     if ((winstation = get_process_winstation( current->process, WINSTA_CREATEDESKTOP )))
 459     {
 460         if ((desktop = create_desktop( &name, req->attributes, req->flags, winstation )))
 461         {
 462             reply->handle = alloc_handle( current->process, desktop, req->access, req->attributes );
 463             release_object( desktop );
 464         }
 465         release_object( winstation );
 466     }
 467 }
 468
 469 /* open a handle to a desktop */
 470 DECL_HANDLER(open_desktop)
 471 {
 472     struct winstation *winstation;
 473     struct unicode_str name;
 474
 475     get_req_unicode_str( &name );
 476     if ((winstation = get_process_winstation( current->process, 0 /* FIXME: access rights? */ )))
 477     {
 478         struct unicode_str full_str;
 479         WCHAR *full_name;
 480
 481         if ((full_name = build_desktop_name( &name, winstation, &full_str )))
 482         {
 483             reply->handle = open_object( winstation_namespace, &full_str, &desktop_ops, req->access,
 484                                          req->attributes );
 485             free( full_name );
 486         }
 487         release_object( winstation );
 488     }
 489 }
 490
 491
 492 /* close a desktop */
 493 DECL_HANDLER(close_desktop)
 494 {
 495     struct desktop *desktop;
 496
 497     /* make sure it is a desktop handle */
 498     if ((desktop = (struct desktop *)get_handle_obj( current->process, req->handle,
 499                                                      0, &desktop_ops )))
 500     {
 501         if (!close_handle( current->process, req->handle )) set_error( STATUS_DEVICE_BUSY );
 502         release_object( desktop );
 503     }
 504 }
 505
 506
 507 /* get the thread current desktop */
 508 DECL_HANDLER(get_thread_desktop)
 509 {
 510     struct thread *thread;
 511
 512     if (!(thread = get_thread_from_id( req->tid ))) return;
 513     reply->handle = thread->desktop;
 514     release_object( thread );
 515 }
 516
 517
 518 /* set the thread current desktop */
 519 DECL_HANDLER(set_thread_desktop)
 520 {
 521     struct desktop *old_desktop, *new_desktop;
 522     struct winstation *winstation;
 523
 524     if (!(winstation = get_process_winstation( current->process, 0 /* FIXME: access rights? */ )))
 525         return;
 526
 527     if (!(new_desktop = get_desktop_obj( current->process, req->handle, 0 )))
 528     {
 529         release_object( winstation );
 530         return;
 531     }
 532     if (new_desktop->winstation != winstation)
 533     {
 534         set_error( STATUS_ACCESS_DENIED );
 535         release_object( new_desktop );
 536         release_object( winstation );
 537         return;
 538     }
 539
 540     /* check if we are changing to a new desktop */
 541
 542     if (!(old_desktop = get_desktop_obj( current->process, current->desktop, 0)))
 543         clear_error();  /* ignore error */
 544
 545     /* when changing desktop, we can't have any users on the current one */
 546     if (old_desktop != new_desktop && current->desktop_users > 0)
 547         set_error( STATUS_DEVICE_BUSY );
 548     else
 549         current->desktop = req->handle;  /* FIXME: should we close the old one? */
 550
 551     if (!current->process->desktop)
 552         set_process_default_desktop( current->process, new_desktop, req->handle );
 553
 554     if (old_desktop != new_desktop && current->queue) detach_thread_input( current );
 555
 556     if (old_desktop) release_object( old_desktop );
 557     release_object( new_desktop );
 558     release_object( winstation );
 559 }
 560
 561
 562 /* get/set information about a user object (window station or desktop) */
 563 DECL_HANDLER(set_user_object_info)
 564 {
 565     struct object *obj;
 566
 567     if (!(obj = get_handle_obj( current->process, req->handle, 0, NULL ))) return;
 568
 569     if (obj->ops == &desktop_ops)
 570     {
 571         struct desktop *desktop = (struct desktop *)obj;
 572         reply->is_desktop = 1;
 573         reply->old_obj_flags = desktop->flags;
 574         if (req->flags & SET_USER_OBJECT_FLAGS) desktop->flags = req->obj_flags;
 575     }
 576     else if (obj->ops == &winstation_ops)
 577     {
 578         struct winstation *winstation = (struct winstation *)obj;
 579         reply->is_desktop = 0;
 580         reply->old_obj_flags = winstation->flags;
 581         if (req->flags & SET_USER_OBJECT_FLAGS) winstation->flags = req->obj_flags;
 582     }
 583     else
 584     {
 585         set_error( STATUS_OBJECT_TYPE_MISMATCH );
 586         release_object( obj );
 587         return;
 588     }
 589     if (get_reply_max_size())
 590     {
 591         data_size_t len;
 592         const WCHAR *ptr, *name = get_object_name( obj, &len );
 593
 594         /* if there is a backslash return the part of the name after it */
 595         if (name && (ptr = memchrW( name, '\\', len )))
 596         {
 597             len -= (ptr + 1 - name) * sizeof(WCHAR);
 598             name = ptr + 1;
 599         }
 600         if (name) set_reply_data( name, min( len, get_reply_max_size() ));
 601     }
 602     release_object( obj );
 603 }