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