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 void desktop_dump( struct object *obj, int verbose );
  50 static int desktop_close_handle( struct object *obj, struct process *process, obj_handle_t handle );
  51 static void desktop_destroy( struct object *obj );
  52
  53 static const struct object_ops winstation_ops =
  54 {
  55     sizeof(struct winstation),    /* size */
  56     winstation_dump,              /* dump */
  57     no_add_queue,                 /* add_queue */
  58     NULL,                         /* remove_queue */
  59     NULL,                         /* signaled */
  60     NULL,                         /* satisfied */
  61     no_signal,                    /* signal */
  62     no_get_fd,                    /* get_fd */
  63     no_map_access,                /* map_access */
  64     no_lookup_name,               /* lookup_name */
  65     winstation_close_handle,      /* close_handle */
  66     winstation_destroy            /* destroy */
  67 };
  68
  69
  70 static const struct object_ops desktop_ops =
  71 {
  72     sizeof(struct desktop),       /* size */
  73     desktop_dump,                 /* dump */
  74     no_add_queue,                 /* add_queue */
  75     NULL,                         /* remove_queue */
  76     NULL,                         /* signaled */
  77     NULL,                         /* satisfied */
  78     no_signal,                    /* signal */
  79     no_get_fd,                    /* get_fd */
  80     no_map_access,                /* map_access */
  81     no_lookup_name,               /* lookup_name */
  82     desktop_close_handle,         /* close_handle */
  83     desktop_destroy               /* destroy */
  84 };
  85
  86 #define DESKTOP_ALL_ACCESS 0x01ff
  87
  88 /* create a winstation object */
  89 static struct winstation *create_winstation( const struct unicode_str *name, unsigned int attr,
  90                                              unsigned int flags )
  91 {
  92     struct winstation *winstation;
  93
  94     if (!winstation_namespace && !(winstation_namespace = create_namespace( 7 )))
  95         return NULL;
  96
  97     if (memchrW( name->str, '\\', name->len / sizeof(WCHAR) ))  /* no backslash allowed in name */
  98     {
  99         set_error( STATUS_INVALID_PARAMETER );
 100         return NULL;
 101     }
 102
 103     if ((winstation = create_named_object( winstation_namespace, &winstation_ops, name, attr )))
 104     {
 105         if (get_error() != STATUS_OBJECT_NAME_EXISTS)
 106         {
 107             /* initialize it if it didn't already exist */
 108             winstation->flags = flags;
 109             winstation->clipboard = NULL;
 110             winstation->atom_table = NULL;
 111             list_add_tail( &winstation_list, &winstation->entry );
 112             list_init( &winstation->desktops );
 113         }
 114     }
 115     return winstation;
 116 }
 117
 118 static void winstation_dump( struct object *obj, int verbose )
 119 {
 120     struct winstation *winstation = (struct winstation *)obj;
 121
 122     fprintf( stderr, "Winstation flags=%x clipboard=%p atoms=%p ",
 123              winstation->flags, winstation->clipboard, winstation->atom_table );
 124     dump_object_name( &winstation->obj );
 125     fputc( '\n', stderr );
 126 }
 127
 128 static int winstation_close_handle( struct object *obj, struct process *process, obj_handle_t handle )
 129 {
 130     return (process->winstation != handle);
 131 }
 132
 133 static void winstation_destroy( struct object *obj )
 134 {
 135     struct winstation *winstation = (struct winstation *)obj;
 136
 137     list_remove( &winstation->entry );
 138     if (winstation->clipboard) release_object( winstation->clipboard );
 139     if (winstation->atom_table) release_object( winstation->atom_table );
 140 }
 141
 142 /* retrieve the process window station, checking the handle access rights */
 143 struct winstation *get_process_winstation( struct process *process, unsigned int access )
 144 {
 145     return (struct winstation *)get_handle_obj( process, process->winstation,
 146                                                 access, &winstation_ops );
 147 }
 148
 149 /* build the full name of a desktop object */
 150 static WCHAR *build_desktop_name( const struct unicode_str *name,
 151                                   struct winstation *winstation, struct unicode_str *res )
 152 {
 153     const WCHAR *winstation_name;
 154     WCHAR *full_name;
 155     size_t winstation_len;
 156
 157     if (memchrW( name->str, '\\', name->len / sizeof(WCHAR) ))
 158     {
 159         set_error( STATUS_INVALID_PARAMETER );
 160         return NULL;
 161     }
 162
 163     if (!(winstation_name = get_object_name( &winstation->obj, &winstation_len )))
 164         winstation_len = 0;
 165
 166     res->len = winstation_len + name->len + sizeof(WCHAR);
 167     if (!(full_name = mem_alloc( res->len ))) return NULL;
 168     memcpy( full_name, winstation_name, winstation_len );
 169     full_name[winstation_len / sizeof(WCHAR)] = '\\';
 170     memcpy( full_name + winstation_len / sizeof(WCHAR) + 1, name->str, name->len );
 171     res->str = full_name;
 172     return full_name;
 173 }
 174
 175 /* retrieve a pointer to a desktop object */
 176 inline static struct desktop *get_desktop_obj( struct process *process, obj_handle_t handle,
 177                                                unsigned int access )
 178 {
 179     return (struct desktop *)get_handle_obj( process, handle, access, &desktop_ops );
 180 }
 181
 182 /* create a desktop object */
 183 static struct desktop *create_desktop( const struct unicode_str *name, unsigned int attr,
 184                                        unsigned int flags, struct winstation *winstation )
 185 {
 186     struct desktop *desktop;
 187     struct unicode_str full_str;
 188     WCHAR *full_name;
 189
 190     if (!(full_name = build_desktop_name( name, winstation, &full_str ))) return NULL;
 191
 192     if ((desktop = create_named_object( winstation_namespace, &desktop_ops, &full_str, attr )))
 193     {
 194         if (get_error() != STATUS_OBJECT_NAME_EXISTS)
 195         {
 196             /* initialize it if it didn't already exist */
 197             desktop->flags = flags;
 198             desktop->winstation = (struct winstation *)grab_object( winstation );
 199             desktop->top_window = NULL;
 200             desktop->global_hooks = NULL;
 201             desktop->close_timeout = NULL;
 202             desktop->users = 0;
 203             list_add_tail( &winstation->desktops, &desktop->entry );
 204         }
 205     }
 206     free( full_name );
 207     return desktop;
 208 }
 209
 210 static void desktop_dump( struct object *obj, int verbose )
 211 {
 212     struct desktop *desktop = (struct desktop *)obj;
 213
 214     fprintf( stderr, "Desktop flags=%x winstation=%p top_win=%p hooks=%p ",
 215              desktop->flags, desktop->winstation, desktop->top_window, desktop->global_hooks );
 216     dump_object_name( &desktop->obj );
 217     fputc( '\n', stderr );
 218 }
 219
 220 static int desktop_close_handle( struct object *obj, struct process *process, obj_handle_t handle )
 221 {
 222     struct thread *thread;
 223
 224     /* check if the handle is currently used by the process or one of its threads */
 225     if (process->desktop == handle) return 0;
 226     LIST_FOR_EACH_ENTRY( thread, &process->thread_list, struct thread, proc_entry )
 227         if (thread->desktop == handle) return 0;
 228     return 1;
 229 }
 230
 231 static void desktop_destroy( struct object *obj )
 232 {
 233     struct desktop *desktop = (struct desktop *)obj;
 234
 235     if (desktop->top_window) destroy_window( desktop->top_window );
 236     if (desktop->global_hooks) release_object( desktop->global_hooks );
 237     if (desktop->close_timeout) remove_timeout_user( desktop->close_timeout );
 238     list_remove( &desktop->entry );
 239     release_object( desktop->winstation );
 240 }
 241
 242 /* retrieve the thread desktop, checking the handle access rights */
 243 struct desktop *get_thread_desktop( struct thread *thread, unsigned int access )
 244 {
 245     return get_desktop_obj( thread->process, thread->desktop, access );
 246 }
 247
 248 /* set the process default desktop handle */
 249 void set_process_default_desktop( struct process *process, struct desktop *desktop,
 250                                   obj_handle_t handle )
 251 {
 252     struct thread *thread;
 253     struct desktop *old_desktop;
 254
 255     if (process->desktop == handle) return;  /* nothing to do */
 256
 257     if (!(old_desktop = get_desktop_obj( process, process->desktop, 0 ))) clear_error();
 258     process->desktop = handle;
 259
 260     /* set desktop for threads that don't have one yet */
 261     LIST_FOR_EACH_ENTRY( thread, &process->thread_list, struct thread, proc_entry )
 262         if (!thread->desktop) thread->desktop = handle;
 263
 264     desktop->users++;
 265     if (desktop->close_timeout)
 266     {
 267         remove_timeout_user( desktop->close_timeout );
 268         desktop->close_timeout = NULL;
 269     }
 270     if (old_desktop)
 271     {
 272         old_desktop->users--;
 273         release_object( old_desktop );
 274     }
 275 }
 276
 277 /* connect a process to its window station */
 278 void connect_process_winstation( struct process *process, struct thread *parent )
 279 {
 280     struct winstation *winstation = NULL;
 281     struct desktop *desktop = NULL;
 282     obj_handle_t handle;
 283
 284     /* check for an inherited winstation handle (don't ask...) */
 285     if ((handle = find_inherited_handle( process, &winstation_ops )))
 286     {
 287         winstation = (struct winstation *)get_handle_obj( process, handle, 0, &winstation_ops );
 288     }
 289     else if (parent && parent->process->winstation)
 290     {
 291         handle = duplicate_handle( parent->process, parent->process->winstation,
 292                                    process, 0, 0, DUP_HANDLE_SAME_ACCESS );
 293         winstation = (struct winstation *)get_handle_obj( process, handle, 0, &winstation_ops );
 294     }
 295     if (!winstation) goto done;
 296     process->winstation = handle;
 297
 298     if ((handle = find_inherited_handle( process, &desktop_ops )))
 299     {
 300         desktop = get_desktop_obj( process, handle, 0 );
 301         if (!desktop || desktop->winstation != winstation) goto done;
 302     }
 303     else if (parent && parent->desktop)
 304     {
 305         desktop = get_desktop_obj( parent->process, parent->desktop, 0 );
 306         if (!desktop || desktop->winstation != winstation) goto done;
 307         handle = duplicate_handle( parent->process, parent->desktop,
 308                                    process, 0, 0, DUP_HANDLE_SAME_ACCESS );
 309     }
 310
 311     if (handle) set_process_default_desktop( process, desktop, handle );
 312
 313 done:
 314     if (desktop) release_object( desktop );
 315     if (winstation) release_object( winstation );
 316     clear_error();
 317 }
 318
 319 static void close_desktop_timeout( void *private )
 320 {
 321     struct desktop *desktop = private;
 322
 323     desktop->close_timeout = NULL;
 324     unlink_named_object( &desktop->obj );  /* make sure no other process can open it */
 325     close_desktop_window( desktop );  /* and signal the owner to quit */
 326 }
 327
 328 /* close the desktop of a given process */
 329 void close_process_desktop( struct process *process )
 330 {
 331     struct desktop *desktop;
 332
 333     if (process->desktop && (desktop = get_desktop_obj( process, process->desktop, 0 )))
 334     {
 335         assert( desktop->users > 0 );
 336         desktop->users--;
 337         /* if we have one remaining user, it has to be the manager of the desktop window */
 338         if (desktop->users == 1 && get_top_window_owner( desktop ))
 339         {
 340             struct timeval when;
 341             gettimeofday( &when, NULL );
 342             add_timeout( &when, 1000 );
 343             assert( !desktop->close_timeout );
 344             desktop->close_timeout = add_timeout_user( &when, close_desktop_timeout, desktop );
 345         }
 346         release_object( desktop );
 347     }
 348     clear_error();  /* ignore errors */
 349 }
 350
 351 /* close the desktop of a given thread */
 352 void close_thread_desktop( struct thread *thread )
 353 {
 354     obj_handle_t handle = thread->desktop;
 355
 356     thread->desktop = 0;
 357     if (handle) close_handle( thread->process, handle, NULL );
 358     clear_error();  /* ignore errors */
 359 }
 360
 361
 362 /* create a window station */
 363 DECL_HANDLER(create_winstation)
 364 {
 365     struct winstation *winstation;
 366     struct unicode_str name;
 367
 368     reply->handle = 0;
 369     get_req_unicode_str( &name );
 370     if ((winstation = create_winstation( &name, req->attributes, req->flags )))
 371     {
 372         reply->handle = alloc_handle( current->process, winstation, req->access, req->attributes );
 373         release_object( winstation );
 374     }
 375 }
 376
 377 /* open a handle to a window station */
 378 DECL_HANDLER(open_winstation)
 379 {
 380     struct unicode_str name;
 381
 382     get_req_unicode_str( &name );
 383     if (winstation_namespace)
 384         reply->handle = open_object( winstation_namespace, &name, &winstation_ops, req->access,
 385                                      req->attributes );
 386     else
 387         set_error( STATUS_OBJECT_NAME_NOT_FOUND );
 388 }
 389
 390
 391 /* close a window station */
 392 DECL_HANDLER(close_winstation)
 393 {
 394     struct winstation *winstation;
 395
 396     if ((winstation = (struct winstation *)get_handle_obj( current->process, req->handle,
 397                                                            0, &winstation_ops )))
 398     {
 399         if (!close_handle( current->process, req->handle, NULL )) set_error( STATUS_ACCESS_DENIED );
 400         release_object( winstation );
 401     }
 402 }
 403
 404
 405 /* get the process current window station */
 406 DECL_HANDLER(get_process_winstation)
 407 {
 408     reply->handle = current->process->winstation;
 409 }
 410
 411
 412 /* set the process current window station */
 413 DECL_HANDLER(set_process_winstation)
 414 {
 415     struct winstation *winstation;
 416
 417     if ((winstation = (struct winstation *)get_handle_obj( current->process, req->handle,
 418                                                            0, &winstation_ops )))
 419     {
 420         /* FIXME: should we close the old one? */
 421         current->process->winstation = req->handle;
 422         release_object( winstation );
 423     }
 424 }
 425
 426 /* create a desktop */
 427 DECL_HANDLER(create_desktop)
 428 {
 429     struct desktop *desktop;
 430     struct winstation *winstation;
 431     struct unicode_str name;
 432
 433     reply->handle = 0;
 434     get_req_unicode_str( &name );
 435     if ((winstation = get_process_winstation( current->process, WINSTA_CREATEDESKTOP )))
 436     {
 437         if ((desktop = create_desktop( &name, req->attributes, req->flags, winstation )))
 438         {
 439             reply->handle = alloc_handle( current->process, desktop, req->access, req->attributes );
 440             release_object( desktop );
 441         }
 442         release_object( winstation );
 443     }
 444 }
 445
 446 /* open a handle to a desktop */
 447 DECL_HANDLER(open_desktop)
 448 {
 449     struct winstation *winstation;
 450     struct unicode_str name;
 451
 452     get_req_unicode_str( &name );
 453     if ((winstation = get_process_winstation( current->process, 0 /* FIXME: access rights? */ )))
 454     {
 455         struct unicode_str full_str;
 456         WCHAR *full_name;
 457
 458         if ((full_name = build_desktop_name( &name, winstation, &full_str )))
 459         {
 460             reply->handle = open_object( winstation_namespace, &full_str, &desktop_ops, req->access,
 461                                          req->attributes );
 462             free( full_name );
 463         }
 464         release_object( winstation );
 465     }
 466 }
 467
 468
 469 /* close a desktop */
 470 DECL_HANDLER(close_desktop)
 471 {
 472     struct desktop *desktop;
 473
 474     /* make sure it is a desktop handle */
 475     if ((desktop = (struct desktop *)get_handle_obj( current->process, req->handle,
 476                                                      0, &desktop_ops )))
 477     {
 478         if (!close_handle( current->process, req->handle, NULL )) set_error( STATUS_DEVICE_BUSY );
 479         release_object( desktop );
 480     }
 481 }
 482
 483
 484 /* get the thread current desktop */
 485 DECL_HANDLER(get_thread_desktop)
 486 {
 487     struct thread *thread;
 488
 489     if (!(thread = get_thread_from_id( req->tid ))) return;
 490     reply->handle = thread->desktop;
 491     release_object( thread );
 492 }
 493
 494
 495 /* set the thread current desktop */
 496 DECL_HANDLER(set_thread_desktop)
 497 {
 498     struct desktop *old_desktop, *new_desktop;
 499     struct winstation *winstation;
 500
 501     if (!(winstation = get_process_winstation( current->process, 0 /* FIXME: access rights? */ )))
 502         return;
 503
 504     if (!(new_desktop = get_desktop_obj( current->process, req->handle, 0 )))
 505     {
 506         release_object( winstation );
 507         return;
 508     }
 509     if (new_desktop->winstation != winstation)
 510     {
 511         set_error( STATUS_ACCESS_DENIED );
 512         release_object( new_desktop );
 513         release_object( winstation );
 514         return;
 515     }
 516
 517     /* check if we are changing to a new desktop */
 518
 519     if (!(old_desktop = get_desktop_obj( current->process, current->desktop, 0)))
 520         clear_error();  /* ignore error */
 521
 522     /* when changing desktop, we can't have any users on the current one */
 523     if (old_desktop != new_desktop && current->desktop_users > 0)
 524         set_error( STATUS_DEVICE_BUSY );
 525     else
 526         current->desktop = req->handle;  /* FIXME: should we close the old one? */
 527
 528     if (!current->process->desktop)
 529         set_process_default_desktop( current->process, new_desktop, req->handle );
 530
 531     if (old_desktop != new_desktop && current->queue) detach_thread_input( current );
 532
 533     if (old_desktop) release_object( old_desktop );
 534     release_object( new_desktop );
 535     release_object( winstation );
 536 }
 537
 538
 539 /* get/set information about a user object (window station or desktop) */
 540 DECL_HANDLER(set_user_object_info)
 541 {
 542     struct object *obj;
 543
 544     if (!(obj = get_handle_obj( current->process, req->handle, 0, NULL ))) return;
 545
 546     if (obj->ops == &desktop_ops)
 547     {
 548         struct desktop *desktop = (struct desktop *)obj;
 549         reply->is_desktop = 1;
 550         reply->old_obj_flags = desktop->flags;
 551         if (req->flags & SET_USER_OBJECT_FLAGS) desktop->flags = req->obj_flags;
 552     }
 553     else if (obj->ops == &winstation_ops)
 554     {
 555         struct winstation *winstation = (struct winstation *)obj;
 556         reply->is_desktop = 0;
 557         reply->old_obj_flags = winstation->flags;
 558         if (req->flags & SET_USER_OBJECT_FLAGS) winstation->flags = req->obj_flags;
 559     }
 560     else
 561     {
 562         set_error( STATUS_OBJECT_TYPE_MISMATCH );
 563         release_object( obj );
 564         return;
 565     }
 566     if (get_reply_max_size())
 567     {
 568         size_t len;
 569         const WCHAR *ptr, *name = get_object_name( obj, &len );
 570
 571         /* if there is a backslash return the part of the name after it */
 572         if (name && (ptr = memchrW( name, '\\', len )))
 573         {
 574             len -= (ptr + 1 - name) * sizeof(WCHAR);
 575             name = ptr + 1;
 576         }
 577         if (name) set_reply_data( name, min( len, get_reply_max_size() ));
 578     }
 579     release_object( obj );
 580 }