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 "windef.h"
  28 #include "winbase.h"
  29 #include "winuser.h"
  30 #include "winternl.h"
  31
  32 #include "object.h"
  33 #include "handle.h"
  34 #include "request.h"
  35 #include "process.h"
  36 #include "user.h"
  37 #include "wine/unicode.h"
  38
  39
  40 static struct list winstation_list = LIST_INIT(winstation_list);
  41 static struct winstation *interactive_winstation;
  42 static struct namespace *winstation_namespace;
  43
  44 static void winstation_dump( struct object *obj, int verbose );
  45 static int winstation_close_handle( struct object *obj, struct process *process, obj_handle_t handle );
  46 static void winstation_destroy( struct object *obj );
  47 static void desktop_dump( struct object *obj, int verbose );
  48 static int desktop_close_handle( struct object *obj, struct process *process, obj_handle_t handle );
  49 static void desktop_destroy( struct object *obj );
  50
  51 static const struct object_ops winstation_ops =
  52 {
  53     sizeof(struct winstation),    /* size */
  54     winstation_dump,              /* dump */
  55     no_add_queue,                 /* add_queue */
  56     NULL,                         /* remove_queue */
  57     NULL,                         /* signaled */
  58     NULL,                         /* satisfied */
  59     no_signal,                    /* signal */
  60     no_get_fd,                    /* get_fd */
  61     winstation_close_handle,      /* close_handle */
  62     winstation_destroy            /* destroy */
  63 };
  64
  65
  66 static const struct object_ops desktop_ops =
  67 {
  68     sizeof(struct desktop),       /* size */
  69     desktop_dump,                 /* dump */
  70     no_add_queue,                 /* add_queue */
  71     NULL,                         /* remove_queue */
  72     NULL,                         /* signaled */
  73     NULL,                         /* satisfied */
  74     no_signal,                    /* signal */
  75     no_get_fd,                    /* get_fd */
  76     desktop_close_handle,         /* close_handle */
  77     desktop_destroy               /* destroy */
  78 };
  79
  80 #define DESKTOP_ALL_ACCESS 0x01ff
  81
  82 /* create a winstation object */
  83 static struct winstation *create_winstation( const WCHAR *name, size_t len, unsigned int flags )
  84 {
  85     struct winstation *winstation;
  86
  87     if (!winstation_namespace && !(winstation_namespace = create_namespace( 7 )))
  88         return NULL;
  89
  90     if (memchrW( name, '\\', len / sizeof(WCHAR) ))  /* no backslash allowed in name */
  91     {
  92         set_error( STATUS_INVALID_PARAMETER );
  93         return NULL;
  94     }
  95
  96     if ((winstation = create_named_object( winstation_namespace, &winstation_ops, name, len,
  97                                            OBJ_CASE_INSENSITIVE )))
  98     {
  99         if (get_error() != STATUS_OBJECT_NAME_COLLISION)
 100         {
 101             /* initialize it if it didn't already exist */
 102             winstation->flags = flags;
 103             winstation->clipboard = NULL;
 104             winstation->atom_table = NULL;
 105             list_add_tail( &winstation_list, &winstation->entry );
 106             list_init( &winstation->desktops );
 107         }
 108     }
 109     return winstation;
 110 }
 111
 112 static void winstation_dump( struct object *obj, int verbose )
 113 {
 114     struct winstation *winstation = (struct winstation *)obj;
 115
 116     fprintf( stderr, "Winstation flags=%x clipboard=%p atoms=%p ",
 117              winstation->flags, winstation->clipboard, winstation->atom_table );
 118     dump_object_name( &winstation->obj );
 119     fputc( '\n', stderr );
 120 }
 121
 122 static int winstation_close_handle( struct object *obj, struct process *process, obj_handle_t handle )
 123 {
 124     return (process->winstation != handle);
 125 }
 126
 127 static void winstation_destroy( struct object *obj )
 128 {
 129     struct winstation *winstation = (struct winstation *)obj;
 130
 131     if (winstation == interactive_winstation) interactive_winstation = NULL;
 132     list_remove( &winstation->entry );
 133     if (winstation->clipboard) release_object( winstation->clipboard );
 134     if (winstation->atom_table) release_object( winstation->atom_table );
 135 }
 136
 137 /* retrieve the process window station, checking the handle access rights */
 138 struct winstation *get_process_winstation( struct process *process, unsigned int access )
 139 {
 140     return (struct winstation *)get_handle_obj( process, process->winstation,
 141                                                 access, &winstation_ops );
 142 }
 143
 144 /* build the full name of a desktop object */
 145 static WCHAR *build_desktop_name( const WCHAR *name, size_t len,
 146                                   struct winstation *winstation, size_t *res_len )
 147 {
 148     const WCHAR *winstation_name;
 149     WCHAR *full_name;
 150     size_t winstation_len;
 151
 152     if (memchrW( name, '\\', len / sizeof(WCHAR) ))
 153     {
 154         set_error( STATUS_INVALID_PARAMETER );
 155         return NULL;
 156     }
 157
 158     if (!(winstation_name = get_object_name( &winstation->obj, &winstation_len )))
 159         winstation_len = 0;
 160
 161     *res_len = winstation_len + len + sizeof(WCHAR);
 162     if (!(full_name = mem_alloc( *res_len ))) return NULL;
 163     memcpy( full_name, winstation_name, winstation_len );
 164     full_name[winstation_len / sizeof(WCHAR)] = '\\';
 165     memcpy( full_name + winstation_len / sizeof(WCHAR) + 1, name, len );
 166     return full_name;
 167 }
 168
 169 /* retrieve a pointer to a desktop object */
 170 inline static struct desktop *get_desktop_obj( struct process *process, obj_handle_t handle,
 171                                                unsigned int access )
 172 {
 173     return (struct desktop *)get_handle_obj( process, handle, access, &desktop_ops );
 174 }
 175
 176 /* create a desktop object */
 177 static struct desktop *create_desktop( const WCHAR *name, size_t len, unsigned int flags,
 178                                        struct winstation *winstation )
 179 {
 180     struct desktop *desktop;
 181     WCHAR *full_name;
 182     size_t full_len;
 183
 184     if (!(full_name = build_desktop_name( name, len, winstation, &full_len ))) return NULL;
 185
 186     if ((desktop = create_named_object( winstation_namespace, &desktop_ops, full_name, full_len,
 187                                         OBJ_CASE_INSENSITIVE )))
 188     {
 189         if (get_error() != STATUS_OBJECT_NAME_COLLISION)
 190         {
 191             /* initialize it if it didn't already exist */
 192             desktop->flags = flags;
 193             desktop->winstation = (struct winstation *)grab_object( winstation );
 194             desktop->top_window = NULL;
 195             desktop->global_hooks = NULL;
 196             list_add_tail( &winstation->desktops, &desktop->entry );
 197         }
 198     }
 199     free( full_name );
 200     return desktop;
 201 }
 202
 203 static void desktop_dump( struct object *obj, int verbose )
 204 {
 205     struct desktop *desktop = (struct desktop *)obj;
 206
 207     fprintf( stderr, "Desktop flags=%x winstation=%p top_win=%p hooks=%p ",
 208              desktop->flags, desktop->winstation, desktop->top_window, desktop->global_hooks );
 209     dump_object_name( &desktop->obj );
 210     fputc( '\n', stderr );
 211 }
 212
 213 static int desktop_close_handle( struct object *obj, struct process *process, obj_handle_t handle )
 214 {
 215     struct thread *thread;
 216
 217     /* check if the handle is currently used by the process or one of its threads */
 218     if (process->desktop == handle) return 0;
 219     LIST_FOR_EACH_ENTRY( thread, &process->thread_list, struct thread, proc_entry )
 220         if (thread->desktop == handle) return 0;
 221     return 1;
 222 }
 223
 224 static void desktop_destroy( struct object *obj )
 225 {
 226     struct desktop *desktop = (struct desktop *)obj;
 227
 228     if (desktop->top_window) destroy_window( desktop->top_window );
 229     if (desktop->global_hooks) release_object( desktop->global_hooks );
 230     list_remove( &desktop->entry );
 231     release_object( desktop->winstation );
 232 }
 233
 234 /* retrieve the thread desktop, checking the handle access rights */
 235 struct desktop *get_thread_desktop( struct thread *thread, unsigned int access )
 236 {
 237     return get_desktop_obj( thread->process, thread->desktop, access );
 238 }
 239
 240 /* connect a process to its window station */
 241 void connect_process_winstation( struct process *process, const WCHAR *name, size_t len )
 242 {
 243     struct winstation *winstation;
 244
 245     if (process->winstation) return;  /* already has one */
 246
 247     /* check for an inherited winstation handle (don't ask...) */
 248     if ((process->winstation = find_inherited_handle( process, &winstation_ops )) != 0) return;
 249
 250     if (name)
 251     {
 252         winstation = create_winstation( name, len, 0 );
 253     }
 254     else
 255     {
 256         if (!interactive_winstation)
 257         {
 258             static const WCHAR winsta0W[] = {'W','i','n','S','t','a','0'};
 259             interactive_winstation = create_winstation( winsta0W, sizeof(winsta0W), 0 );
 260             winstation = interactive_winstation;
 261         }
 262         else winstation = (struct winstation *)grab_object( interactive_winstation );
 263     }
 264     if (winstation)
 265     {
 266         process->winstation = alloc_handle( process, winstation, WINSTA_ALL_ACCESS, FALSE );
 267         release_object( winstation );
 268     }
 269     clear_error();  /* ignore errors */
 270 }
 271
 272 /* connect a process to its main desktop */
 273 void connect_process_desktop( struct process *process, const WCHAR *name, size_t len )
 274 {
 275     struct desktop *desktop;
 276     struct winstation *winstation;
 277
 278     if (process->desktop) return;  /* already has one */
 279
 280     if ((winstation = get_process_winstation( process, WINSTA_CREATEDESKTOP )))
 281     {
 282         static const WCHAR defaultW[] = {'D','e','f','a','u','l','t'};
 283
 284         if (!name)
 285         {
 286             name = defaultW;
 287             len = sizeof(defaultW);
 288         }
 289         if ((desktop = create_desktop( name, len, 0, winstation )))
 290         {
 291             process->desktop = alloc_handle( process, desktop, DESKTOP_ALL_ACCESS, FALSE );
 292             release_object( desktop );
 293         }
 294         release_object( winstation );
 295     }
 296     clear_error();  /* ignore errors */
 297 }
 298
 299 /* close the desktop of a given thread */
 300 void close_thread_desktop( struct thread *thread )
 301 {
 302     obj_handle_t handle = thread->desktop;
 303
 304     thread->desktop = 0;
 305     if (handle) close_handle( thread->process, handle, NULL );
 306     clear_error();  /* ignore errors */
 307 }
 308
 309
 310 /* create a window station */
 311 DECL_HANDLER(create_winstation)
 312 {
 313     struct winstation *winstation;
 314
 315     reply->handle = 0;
 316     if ((winstation = create_winstation( get_req_data(), get_req_data_size(), req->flags )))
 317     {
 318         reply->handle = alloc_handle( current->process, winstation, req->access, req->inherit );
 319         release_object( winstation );
 320     }
 321 }
 322
 323 /* open a handle to a window station */
 324 DECL_HANDLER(open_winstation)
 325 {
 326     if (winstation_namespace)
 327         reply->handle = open_object( winstation_namespace, get_req_data(), get_req_data_size(),
 328                                      &winstation_ops, req->access,
 329                                      OBJ_CASE_INSENSITIVE | (req->inherit ? OBJ_INHERIT:0) );
 330     else
 331         set_error( STATUS_OBJECT_NAME_NOT_FOUND );
 332 }
 333
 334
 335 /* close a window station */
 336 DECL_HANDLER(close_winstation)
 337 {
 338     struct winstation *winstation;
 339
 340     if ((winstation = (struct winstation *)get_handle_obj( current->process, req->handle,
 341                                                            0, &winstation_ops )))
 342     {
 343         if (!close_handle( current->process, req->handle, NULL )) set_error( STATUS_ACCESS_DENIED );
 344         release_object( winstation );
 345     }
 346 }
 347
 348
 349 /* get the process current window station */
 350 DECL_HANDLER(get_process_winstation)
 351 {
 352     reply->handle = current->process->winstation;
 353 }
 354
 355
 356 /* set the process current window station */
 357 DECL_HANDLER(set_process_winstation)
 358 {
 359     struct winstation *winstation;
 360
 361     if ((winstation = (struct winstation *)get_handle_obj( current->process, req->handle,
 362                                                            0, &winstation_ops )))
 363     {
 364         /* FIXME: should we close the old one? */
 365         current->process->winstation = req->handle;
 366         release_object( winstation );
 367     }
 368 }
 369
 370 /* create a desktop */
 371 DECL_HANDLER(create_desktop)
 372 {
 373     struct desktop *desktop;
 374     struct winstation *winstation;
 375
 376     reply->handle = 0;
 377     if ((winstation = get_process_winstation( current->process, WINSTA_CREATEDESKTOP )))
 378     {
 379         if ((desktop = create_desktop( get_req_data(), get_req_data_size(),
 380                                        req->flags, winstation )))
 381         {
 382             reply->handle = alloc_handle( current->process, desktop, req->access, req->inherit );
 383             release_object( desktop );
 384         }
 385         release_object( winstation );
 386     }
 387 }
 388
 389 /* open a handle to a desktop */
 390 DECL_HANDLER(open_desktop)
 391 {
 392     struct winstation *winstation;
 393
 394     if ((winstation = get_process_winstation( current->process, 0 /* FIXME: access rights? */ )))
 395     {
 396         size_t full_len;
 397         WCHAR *full_name;
 398
 399         if ((full_name = build_desktop_name( get_req_data(), get_req_data_size(),
 400                                              winstation, &full_len )))
 401         {
 402             reply->handle = open_object( winstation_namespace, full_name, full_len,
 403                                          &desktop_ops, req->access,
 404                                          OBJ_CASE_INSENSITIVE | (req->inherit ? OBJ_INHERIT:0) );
 405             free( full_name );
 406         }
 407         release_object( winstation );
 408     }
 409 }
 410
 411
 412 /* close a desktop */
 413 DECL_HANDLER(close_desktop)
 414 {
 415     struct desktop *desktop;
 416
 417     /* make sure it is a desktop handle */
 418     if ((desktop = (struct desktop *)get_handle_obj( current->process, req->handle,
 419                                                      0, &desktop_ops )))
 420     {
 421         if (!close_handle( current->process, req->handle, NULL )) set_error( STATUS_DEVICE_BUSY );
 422         release_object( desktop );
 423     }
 424 }
 425
 426
 427 /* get the thread current desktop */
 428 DECL_HANDLER(get_thread_desktop)
 429 {
 430     struct thread *thread;
 431
 432     if (!(thread = get_thread_from_id( req->tid ))) return;
 433     reply->handle = thread->desktop;
 434     release_object( thread );
 435 }
 436
 437
 438 /* set the thread current desktop */
 439 DECL_HANDLER(set_thread_desktop)
 440 {
 441     struct desktop *old_desktop, *new_desktop;
 442     struct winstation *winstation;
 443
 444     if (!(winstation = get_process_winstation( current->process, 0 /* FIXME: access rights? */ )))
 445         return;
 446
 447     if (!(new_desktop = get_desktop_obj( current->process, req->handle, 0 )))
 448     {
 449         release_object( winstation );
 450         return;
 451     }
 452     if (new_desktop->winstation != winstation)
 453     {
 454         set_error( STATUS_ACCESS_DENIED );
 455         release_object( new_desktop );
 456         release_object( winstation );
 457         return;
 458     }
 459
 460     /* check if we are changing to a new desktop */
 461
 462     if (!(old_desktop = get_desktop_obj( current->process, current->desktop, 0)))
 463         clear_error();  /* ignore error */
 464
 465     /* when changing desktop, we can't have any users on the current one */
 466     if (old_desktop != new_desktop && current->desktop_users > 0)
 467         set_error( STATUS_DEVICE_BUSY );
 468     else
 469         current->desktop = req->handle;  /* FIXME: should we close the old one? */
 470
 471     if (old_desktop != new_desktop) detach_thread_input( current );
 472
 473     if (old_desktop) release_object( old_desktop );
 474     release_object( new_desktop );
 475     release_object( winstation );
 476 }
 477
 478
 479 /* get/set information about a user object (window station or desktop) */
 480 DECL_HANDLER(set_user_object_info)
 481 {
 482     struct object *obj;
 483
 484     if (!(obj = get_handle_obj( current->process, req->handle, 0, NULL ))) return;
 485
 486     if (obj->ops == &desktop_ops)
 487     {
 488         struct desktop *desktop = (struct desktop *)obj;
 489         reply->is_desktop = 1;
 490         reply->old_obj_flags = desktop->flags;
 491         if (req->flags & SET_USER_OBJECT_FLAGS) desktop->flags = req->obj_flags;
 492     }
 493     else if (obj->ops == &winstation_ops)
 494     {
 495         struct winstation *winstation = (struct winstation *)obj;
 496         reply->is_desktop = 0;
 497         reply->old_obj_flags = winstation->flags;
 498         if (req->flags & SET_USER_OBJECT_FLAGS) winstation->flags = req->obj_flags;
 499     }
 500     else
 501     {
 502         set_error( STATUS_OBJECT_TYPE_MISMATCH );
 503         release_object( obj );
 504         return;
 505     }
 506     if (get_reply_max_size())
 507     {
 508         size_t len;
 509         const WCHAR *ptr, *name = get_object_name( obj, &len );
 510
 511         /* if there is a backslash return the part of the name after it */
 512         if (name && (ptr = memchrW( name, '\\', len )))
 513         {
 514             len -= (ptr + 1 - name) * sizeof(WCHAR);
 515             name = ptr + 1;
 516         }
 517         if (name) set_reply_data( name, min( len, get_reply_max_size() ));
 518     }
 519     release_object( obj );
 520 }