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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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 "wine/unicode.h"
  40
  41
  42 static struct list winstation_list = LIST_INIT(winstation_list);
  43 static struct winstation *interactive_winstation;
  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_lookup_name,               /* lookup_name */
  64     winstation_close_handle,      /* close_handle */
  65     winstation_destroy            /* destroy */
  66 };
  67
  68
  69 static const struct object_ops desktop_ops =
  70 {
  71     sizeof(struct desktop),       /* size */
  72     desktop_dump,                 /* dump */
  73     no_add_queue,                 /* add_queue */
  74     NULL,                         /* remove_queue */
  75     NULL,                         /* signaled */
  76     NULL,                         /* satisfied */
  77     no_signal,                    /* signal */
  78     no_get_fd,                    /* get_fd */
  79     no_lookup_name,               /* lookup_name */
  80     desktop_close_handle,         /* close_handle */
  81     desktop_destroy               /* destroy */
  82 };
  83
  84 #define DESKTOP_ALL_ACCESS 0x01ff
  85
  86 /* create a winstation object */
  87 static struct winstation *create_winstation( const struct unicode_str *name, unsigned int attr,
  88                                              unsigned int flags )
  89 {
  90     struct winstation *winstation;
  91
  92     if (!winstation_namespace && !(winstation_namespace = create_namespace( 7 )))
  93         return NULL;
  94
  95     if (memchrW( name->str, '\\', name->len / sizeof(WCHAR) ))  /* no backslash allowed in name */
  96     {
  97         set_error( STATUS_INVALID_PARAMETER );
  98         return NULL;
  99     }
 100
 101     if ((winstation = create_named_object( winstation_namespace, &winstation_ops, name, attr )))
 102     {
 103         if (get_error() != STATUS_OBJECT_NAME_EXISTS)
 104         {
 105             /* initialize it if it didn't already exist */
 106             winstation->flags = flags;
 107             winstation->clipboard = NULL;
 108             winstation->atom_table = NULL;
 109             list_add_tail( &winstation_list, &winstation->entry );
 110             list_init( &winstation->desktops );
 111         }
 112     }
 113     return winstation;
 114 }
 115
 116 static void winstation_dump( struct object *obj, int verbose )
 117 {
 118     struct winstation *winstation = (struct winstation *)obj;
 119
 120     fprintf( stderr, "Winstation flags=%x clipboard=%p atoms=%p ",
 121              winstation->flags, winstation->clipboard, winstation->atom_table );
 122     dump_object_name( &winstation->obj );
 123     fputc( '\n', stderr );
 124 }
 125
 126 static int winstation_close_handle( struct object *obj, struct process *process, obj_handle_t handle )
 127 {
 128     return (process->winstation != handle);
 129 }
 130
 131 static void winstation_destroy( struct object *obj )
 132 {
 133     struct winstation *winstation = (struct winstation *)obj;
 134
 135     if (winstation == interactive_winstation) interactive_winstation = NULL;
 136     list_remove( &winstation->entry );
 137     if (winstation->clipboard) release_object( winstation->clipboard );
 138     if (winstation->atom_table) release_object( winstation->atom_table );
 139 }
 140
 141 /* retrieve the process window station, checking the handle access rights */
 142 struct winstation *get_process_winstation( struct process *process, unsigned int access )
 143 {
 144     return (struct winstation *)get_handle_obj( process, process->winstation,
 145                                                 access, &winstation_ops );
 146 }
 147
 148 /* build the full name of a desktop object */
 149 static WCHAR *build_desktop_name( const struct unicode_str *name,
 150                                   struct winstation *winstation, struct unicode_str *res )
 151 {
 152     const WCHAR *winstation_name;
 153     WCHAR *full_name;
 154     size_t winstation_len;
 155
 156     if (memchrW( name->str, '\\', name->len / sizeof(WCHAR) ))
 157     {
 158         set_error( STATUS_INVALID_PARAMETER );
 159         return NULL;
 160     }
 161
 162     if (!(winstation_name = get_object_name( &winstation->obj, &winstation_len )))
 163         winstation_len = 0;
 164
 165     res->len = winstation_len + name->len + sizeof(WCHAR);
 166     if (!(full_name = mem_alloc( res->len ))) return NULL;
 167     memcpy( full_name, winstation_name, winstation_len );
 168     full_name[winstation_len / sizeof(WCHAR)] = '\\';
 169     memcpy( full_name + winstation_len / sizeof(WCHAR) + 1, name->str, name->len );
 170     res->str = full_name;
 171     return full_name;
 172 }
 173
 174 /* retrieve a pointer to a desktop object */
 175 inline static struct desktop *get_desktop_obj( struct process *process, obj_handle_t handle,
 176                                                unsigned int access )
 177 {
 178     return (struct desktop *)get_handle_obj( process, handle, access, &desktop_ops );
 179 }
 180
 181 /* create a desktop object */
 182 static struct desktop *create_desktop( const struct unicode_str *name, unsigned int attr,
 183                                        unsigned int flags, struct winstation *winstation )
 184 {
 185     struct desktop *desktop;
 186     struct unicode_str full_str;
 187     WCHAR *full_name;
 188
 189     if (!(full_name = build_desktop_name( name, winstation, &full_str ))) return NULL;
 190
 191     if ((desktop = create_named_object( winstation_namespace, &desktop_ops, &full_str, attr )))
 192     {
 193         if (get_error() != STATUS_OBJECT_NAME_EXISTS)
 194         {
 195             /* initialize it if it didn't already exist */
 196             desktop->flags = flags;
 197             desktop->winstation = (struct winstation *)grab_object( winstation );
 198             desktop->top_window = NULL;
 199             desktop->global_hooks = NULL;
 200             list_add_tail( &winstation->desktops, &desktop->entry );
 201         }
 202     }
 203     free( full_name );
 204     return desktop;
 205 }
 206
 207 static void desktop_dump( struct object *obj, int verbose )
 208 {
 209     struct desktop *desktop = (struct desktop *)obj;
 210
 211     fprintf( stderr, "Desktop flags=%x winstation=%p top_win=%p hooks=%p ",
 212              desktop->flags, desktop->winstation, desktop->top_window, desktop->global_hooks );
 213     dump_object_name( &desktop->obj );
 214     fputc( '\n', stderr );
 215 }
 216
 217 static int desktop_close_handle( struct object *obj, struct process *process, obj_handle_t handle )
 218 {
 219     struct thread *thread;
 220
 221     /* check if the handle is currently used by the process or one of its threads */
 222     if (process->desktop == handle) return 0;
 223     LIST_FOR_EACH_ENTRY( thread, &process->thread_list, struct thread, proc_entry )
 224         if (thread->desktop == handle) return 0;
 225     return 1;
 226 }
 227
 228 static void desktop_destroy( struct object *obj )
 229 {
 230     struct desktop *desktop = (struct desktop *)obj;
 231
 232     if (desktop->top_window) destroy_window( desktop->top_window );
 233     if (desktop->global_hooks) release_object( desktop->global_hooks );
 234     list_remove( &desktop->entry );
 235     release_object( desktop->winstation );
 236 }
 237
 238 /* retrieve the thread desktop, checking the handle access rights */
 239 struct desktop *get_thread_desktop( struct thread *thread, unsigned int access )
 240 {
 241     return get_desktop_obj( thread->process, thread->desktop, access );
 242 }
 243
 244 /* connect a process to its window station */
 245 void connect_process_winstation( struct process *process, const struct unicode_str *name )
 246 {
 247     struct winstation *winstation;
 248
 249     if (process->winstation) return;  /* already has one */
 250
 251     /* check for an inherited winstation handle (don't ask...) */
 252     if ((process->winstation = find_inherited_handle( process, &winstation_ops )) != 0) return;
 253
 254     if (name)
 255     {
 256         winstation = create_winstation( name, OBJ_CASE_INSENSITIVE | OBJ_OPENIF, 0 );
 257     }
 258     else
 259     {
 260         if (!interactive_winstation)
 261         {
 262             static const WCHAR winsta0W[] = {'W','i','n','S','t','a','0'};
 263             static const struct unicode_str winsta0 = { winsta0W, sizeof(winsta0W) };
 264             interactive_winstation = create_winstation( &winsta0, OBJ_CASE_INSENSITIVE | OBJ_OPENIF, 0 );
 265             winstation = interactive_winstation;
 266         }
 267         else winstation = (struct winstation *)grab_object( interactive_winstation );
 268     }
 269     if (winstation)
 270     {
 271         process->winstation = alloc_handle( process, winstation, WINSTA_ALL_ACCESS, FALSE );
 272         release_object( winstation );
 273     }
 274     clear_error();  /* ignore errors */
 275 }
 276
 277 /* connect a process to its main desktop */
 278 void connect_process_desktop( struct process *process, const struct unicode_str *name )
 279 {
 280     struct desktop *desktop;
 281     struct winstation *winstation;
 282
 283     if (process->desktop) return;  /* already has one */
 284
 285     if ((winstation = get_process_winstation( process, WINSTA_CREATEDESKTOP )))
 286     {
 287         static const WCHAR defaultW[] = {'D','e','f','a','u','l','t'};
 288         static const struct unicode_str default_str = { defaultW, sizeof(defaultW) };
 289
 290         if (!name) name = &default_str;
 291         if ((desktop = create_desktop( name, OBJ_CASE_INSENSITIVE | OBJ_OPENIF, 0, winstation )))
 292         {
 293             process->desktop = alloc_handle( process, desktop, DESKTOP_ALL_ACCESS, FALSE );
 294             release_object( desktop );
 295         }
 296         release_object( winstation );
 297     }
 298     clear_error();  /* ignore errors */
 299 }
 300
 301 /* close the desktop of a given thread */
 302 void close_thread_desktop( struct thread *thread )
 303 {
 304     obj_handle_t handle = thread->desktop;
 305
 306     thread->desktop = 0;
 307     if (handle) close_handle( thread->process, handle, NULL );
 308     clear_error();  /* ignore errors */
 309 }
 310
 311
 312 /* create a window station */
 313 DECL_HANDLER(create_winstation)
 314 {
 315     struct winstation *winstation;
 316     struct unicode_str name;
 317
 318     reply->handle = 0;
 319     get_req_unicode_str( &name );
 320     if ((winstation = create_winstation( &name, req->attributes, req->flags )))
 321     {
 322         reply->handle = alloc_handle( current->process, winstation, req->access,
 323                                       req->attributes & OBJ_INHERIT );
 324         release_object( winstation );
 325     }
 326 }
 327
 328 /* open a handle to a window station */
 329 DECL_HANDLER(open_winstation)
 330 {
 331     struct unicode_str name;
 332
 333     get_req_unicode_str( &name );
 334     if (winstation_namespace)
 335         reply->handle = open_object( winstation_namespace, &name, &winstation_ops, req->access,
 336                                      req->attributes );
 337     else
 338         set_error( STATUS_OBJECT_NAME_NOT_FOUND );
 339 }
 340
 341
 342 /* close a window station */
 343 DECL_HANDLER(close_winstation)
 344 {
 345     struct winstation *winstation;
 346
 347     if ((winstation = (struct winstation *)get_handle_obj( current->process, req->handle,
 348                                                            0, &winstation_ops )))
 349     {
 350         if (!close_handle( current->process, req->handle, NULL )) set_error( STATUS_ACCESS_DENIED );
 351         release_object( winstation );
 352     }
 353 }
 354
 355
 356 /* get the process current window station */
 357 DECL_HANDLER(get_process_winstation)
 358 {
 359     reply->handle = current->process->winstation;
 360 }
 361
 362
 363 /* set the process current window station */
 364 DECL_HANDLER(set_process_winstation)
 365 {
 366     struct winstation *winstation;
 367
 368     if ((winstation = (struct winstation *)get_handle_obj( current->process, req->handle,
 369                                                            0, &winstation_ops )))
 370     {
 371         /* FIXME: should we close the old one? */
 372         current->process->winstation = req->handle;
 373         release_object( winstation );
 374     }
 375 }
 376
 377 /* create a desktop */
 378 DECL_HANDLER(create_desktop)
 379 {
 380     struct desktop *desktop;
 381     struct winstation *winstation;
 382     struct unicode_str name;
 383
 384     reply->handle = 0;
 385     get_req_unicode_str( &name );
 386     if ((winstation = get_process_winstation( current->process, WINSTA_CREATEDESKTOP )))
 387     {
 388         if ((desktop = create_desktop( &name, req->attributes, req->flags, winstation )))
 389         {
 390             reply->handle = alloc_handle( current->process, desktop, req->access,
 391                                           req->attributes & OBJ_INHERIT );
 392             release_object( desktop );
 393         }
 394         release_object( winstation );
 395     }
 396 }
 397
 398 /* open a handle to a desktop */
 399 DECL_HANDLER(open_desktop)
 400 {
 401     struct winstation *winstation;
 402     struct unicode_str name;
 403
 404     get_req_unicode_str( &name );
 405     if ((winstation = get_process_winstation( current->process, 0 /* FIXME: access rights? */ )))
 406     {
 407         struct unicode_str full_str;
 408         WCHAR *full_name;
 409
 410         if ((full_name = build_desktop_name( &name, winstation, &full_str )))
 411         {
 412             reply->handle = open_object( winstation_namespace, &full_str, &desktop_ops, req->access,
 413                                          req->attributes );
 414             free( full_name );
 415         }
 416         release_object( winstation );
 417     }
 418 }
 419
 420
 421 /* close a desktop */
 422 DECL_HANDLER(close_desktop)
 423 {
 424     struct desktop *desktop;
 425
 426     /* make sure it is a desktop handle */
 427     if ((desktop = (struct desktop *)get_handle_obj( current->process, req->handle,
 428                                                      0, &desktop_ops )))
 429     {
 430         if (!close_handle( current->process, req->handle, NULL )) set_error( STATUS_DEVICE_BUSY );
 431         release_object( desktop );
 432     }
 433 }
 434
 435
 436 /* get the thread current desktop */
 437 DECL_HANDLER(get_thread_desktop)
 438 {
 439     struct thread *thread;
 440
 441     if (!(thread = get_thread_from_id( req->tid ))) return;
 442     reply->handle = thread->desktop;
 443     release_object( thread );
 444 }
 445
 446
 447 /* set the thread current desktop */
 448 DECL_HANDLER(set_thread_desktop)
 449 {
 450     struct desktop *old_desktop, *new_desktop;
 451     struct winstation *winstation;
 452
 453     if (!(winstation = get_process_winstation( current->process, 0 /* FIXME: access rights? */ )))
 454         return;
 455
 456     if (!(new_desktop = get_desktop_obj( current->process, req->handle, 0 )))
 457     {
 458         release_object( winstation );
 459         return;
 460     }
 461     if (new_desktop->winstation != winstation)
 462     {
 463         set_error( STATUS_ACCESS_DENIED );
 464         release_object( new_desktop );
 465         release_object( winstation );
 466         return;
 467     }
 468
 469     /* check if we are changing to a new desktop */
 470
 471     if (!(old_desktop = get_desktop_obj( current->process, current->desktop, 0)))
 472         clear_error();  /* ignore error */
 473
 474     /* when changing desktop, we can't have any users on the current one */
 475     if (old_desktop != new_desktop && current->desktop_users > 0)
 476         set_error( STATUS_DEVICE_BUSY );
 477     else
 478         current->desktop = req->handle;  /* FIXME: should we close the old one? */
 479
 480     if (old_desktop != new_desktop) detach_thread_input( current );
 481
 482     if (old_desktop) release_object( old_desktop );
 483     release_object( new_desktop );
 484     release_object( winstation );
 485 }
 486
 487
 488 /* get/set information about a user object (window station or desktop) */
 489 DECL_HANDLER(set_user_object_info)
 490 {
 491     struct object *obj;
 492
 493     if (!(obj = get_handle_obj( current->process, req->handle, 0, NULL ))) return;
 494
 495     if (obj->ops == &desktop_ops)
 496     {
 497         struct desktop *desktop = (struct desktop *)obj;
 498         reply->is_desktop = 1;
 499         reply->old_obj_flags = desktop->flags;
 500         if (req->flags & SET_USER_OBJECT_FLAGS) desktop->flags = req->obj_flags;
 501     }
 502     else if (obj->ops == &winstation_ops)
 503     {
 504         struct winstation *winstation = (struct winstation *)obj;
 505         reply->is_desktop = 0;
 506         reply->old_obj_flags = winstation->flags;
 507         if (req->flags & SET_USER_OBJECT_FLAGS) winstation->flags = req->obj_flags;
 508     }
 509     else
 510     {
 511         set_error( STATUS_OBJECT_TYPE_MISMATCH );
 512         release_object( obj );
 513         return;
 514     }
 515     if (get_reply_max_size())
 516     {
 517         size_t len;
 518         const WCHAR *ptr, *name = get_object_name( obj, &len );
 519
 520         /* if there is a backslash return the part of the name after it */
 521         if (name && (ptr = memchrW( name, '\\', len )))
 522         {
 523             len -= (ptr + 1 - name) * sizeof(WCHAR);
 524             name = ptr + 1;
 525         }
 526         if (name) set_reply_data( name, min( len, get_reply_max_size() ));
 527     }
 528     release_object( obj );
 529 }