server/directory.c

   1 /*
   2  * Server-side directory object management
   3  *
   4  * Copyright (C) 2005 Vitaliy Margolen
   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
  22 #include "config.h"
  23 #include "wine/port.h"
  24
  25 #include <assert.h>
  26 #include <stdarg.h>
  27 #include <stdlib.h>
  28 #include <stdio.h>
  29 #include <sys/types.h>
  30
  31 #include "ntstatus.h"
  32 #define WIN32_NO_STATUS
  33 #include "winternl.h"
  34 #include "ddk/wdm.h"
  35
  36 #include "handle.h"
  37 #include "request.h"
  38 #include "process.h"
  39 #include "file.h"
  40 #include "unicode.h"
  41
  42 #define HASH_SIZE 7  /* default hash size */
  43
  44 struct object_type
  45 {
  46     struct object     obj;        /* object header */
  47 };
  48
  49 static void object_type_dump( struct object *obj, int verbose );
  50 static struct object_type *object_type_get_type( struct object *obj );
  51
  52 static const struct object_ops object_type_ops =
  53 {
  54     sizeof(struct object_type),   /* size */
  55     object_type_dump,             /* dump */
  56     object_type_get_type,         /* get_type */
  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     default_get_sd,               /* get_sd */
  65     default_set_sd,               /* set_sd */
  66     no_lookup_name,               /* lookup_name */
  67     no_open_file,                 /* open_file */
  68     no_close_handle,              /* close_handle */
  69     no_destroy                    /* destroy */
  70 };
  71
  72
  73 struct directory
  74 {
  75     struct object     obj;        /* object header */
  76     struct namespace *entries;    /* directory's name space */
  77 };
  78
  79 static void directory_dump( struct object *obj, int verbose );
  80 static struct object_type *directory_get_type( struct object *obj );
  81 static struct object *directory_lookup_name( struct object *obj, struct unicode_str *name,
  82                                              unsigned int attr );
  83 static void directory_destroy( struct object *obj );
  84
  85 static const struct object_ops directory_ops =
  86 {
  87     sizeof(struct directory),     /* size */
  88     directory_dump,               /* dump */
  89     directory_get_type,           /* get_type */
  90     no_add_queue,                 /* add_queue */
  91     NULL,                         /* remove_queue */
  92     NULL,                         /* signaled */
  93     NULL,                         /* satisfied */
  94     no_signal,                    /* signal */
  95     no_get_fd,                    /* get_fd */
  96     default_fd_map_access,        /* map_access */
  97     default_get_sd,               /* get_sd */
  98     default_set_sd,               /* set_sd */
  99     directory_lookup_name,        /* lookup_name */
 100     no_open_file,                 /* open_file */
 101     no_close_handle,              /* close_handle */
 102     directory_destroy             /* destroy */
 103 };
 104
 105 static struct directory *root_directory;
 106 static struct directory *dir_objtype;
 107
 108
 109 static void object_type_dump( struct object *obj, int verbose )
 110 {
 111     assert( obj->ops == &object_type_ops );
 112
 113     fputs( "Object type ", stderr );
 114     dump_object_name( obj );
 115     fputc( '\n', stderr );
 116 }
 117
 118 static struct object_type *object_type_get_type( struct object *obj )
 119 {
 120     static const WCHAR name[] = {'O','b','j','e','c','t','T','y','p','e'};
 121     static const struct unicode_str str = { name, sizeof(name) };
 122     return get_object_type( &str );
 123 }
 124
 125 static void directory_dump( struct object *obj, int verbose )
 126 {
 127     assert( obj->ops == &directory_ops );
 128
 129     fputs( "Directory ", stderr );
 130     dump_object_name( obj );
 131     fputc( '\n', stderr );
 132 }
 133
 134 static struct object_type *directory_get_type( struct object *obj )
 135 {
 136     static const WCHAR name[] = {'D','i','r','e','c','t','o','r','y'};
 137     static const struct unicode_str str = { name, sizeof(name) };
 138     return get_object_type( &str );
 139 }
 140
 141 static struct object *directory_lookup_name( struct object *obj, struct unicode_str *name,
 142                                              unsigned int attr )
 143 {
 144     struct directory *dir = (struct directory *)obj;
 145     struct object *found;
 146     struct unicode_str tmp;
 147     const WCHAR *p;
 148
 149     assert( obj->ops == &directory_ops );
 150
 151     if (!(p = memchrW( name->str, '\\', name->len / sizeof(WCHAR) )))
 152         /* Last element in the path name */
 153         tmp.len = name->len;
 154     else
 155         tmp.len = (p - name->str) * sizeof(WCHAR);
 156
 157     tmp.str = name->str;
 158     if ((found = find_object( dir->entries, &tmp, attr )))
 159     {
 160         /* Skip trailing \\ */
 161         if (p)
 162         {
 163             p++;
 164             tmp.len += sizeof(WCHAR);
 165         }
 166         /* Move to the next element*/
 167         name->str = p;
 168         name->len -= tmp.len;
 169         return found;
 170     }
 171
 172     if (name->str)
 173     {
 174         if (tmp.len == 0) /* Double backslash */
 175             set_error( STATUS_OBJECT_NAME_INVALID );
 176         else if (p)  /* Path still has backslashes */
 177             set_error( STATUS_OBJECT_PATH_NOT_FOUND );
 178         else
 179             clear_error();
 180     }
 181     return NULL;
 182 }
 183
 184 static void directory_destroy( struct object *obj )
 185 {
 186     struct directory *dir = (struct directory *)obj;
 187     assert( obj->ops == &directory_ops );
 188     free( dir->entries );
 189 }
 190
 191 static struct directory *create_directory( struct directory *root, const struct unicode_str *name,
 192                                            unsigned int attr, unsigned int hash_size,
 193                                            const struct security_descriptor *sd )
 194 {
 195     struct directory *dir;
 196
 197     if ((dir = create_named_object_dir( root, name, attr, &directory_ops )) &&
 198         get_error() != STATUS_OBJECT_NAME_EXISTS)
 199     {
 200         if (!(dir->entries = create_namespace( hash_size )))
 201         {
 202             release_object( dir );
 203             dir = NULL;
 204         }
 205         if (sd) default_set_sd( &dir->obj, sd, OWNER_SECURITY_INFORMATION | GROUP_SECURITY_INFORMATION |
 206                                 DACL_SECURITY_INFORMATION | SACL_SECURITY_INFORMATION );
 207     }
 208     return dir;
 209 }
 210
 211 struct directory *get_directory_obj( struct process *process, obj_handle_t handle, unsigned int access )
 212 {
 213     return (struct directory *)get_handle_obj( process, handle, access, &directory_ops );
 214 }
 215
 216 /******************************************************************************
 217  * Find an object by its name in a given root object
 218  *
 219  * PARAMS
 220  *  root      [I] directory to start search from or NULL to start from \\
 221  *  name      [I] object name to search for
 222  *  attr      [I] OBJECT_ATTRIBUTES.Attributes
 223  *  name_left [O] [optional] leftover name if object is not found
 224  *
 225  * RETURNS
 226  *  NULL:      If params are invalid
 227  *  Found:     If object with exact name is found returns that object
 228  *             (name_left->len == 0). Object's refcount is incremented
 229  *  Not found: The last matched parent. (name_left->len > 0)
 230  *             Parent's refcount is incremented.
 231  */
 232 struct object *find_object_dir( struct directory *root, const struct unicode_str *name,
 233                                 unsigned int attr, struct unicode_str *name_left )
 234 {
 235     struct object *obj, *parent;
 236     struct unicode_str name_tmp;
 237
 238     if (name) name_tmp = *name;
 239     else name_tmp.len = 0;
 240
 241     /* Arguments check:
 242      * - Either rootdir or name have to be specified
 243      * - If root is specified path shouldn't start with backslash */
 244     if (root)
 245     {
 246         if (name_tmp.len && name_tmp.str[0] == '\\')
 247         {
 248             set_error( STATUS_OBJECT_PATH_SYNTAX_BAD );
 249             return NULL;
 250         }
 251         parent = grab_object( root );
 252     }
 253     else
 254     {
 255         if (!name_tmp.len || name_tmp.str[0] != '\\')
 256         {
 257             set_error( STATUS_OBJECT_PATH_SYNTAX_BAD );
 258             return NULL;
 259         }
 260         parent = grab_object( &root_directory->obj );
 261         /* skip leading backslash */
 262         name_tmp.str++;
 263         name_tmp.len -= sizeof(WCHAR);
 264     }
 265
 266     /* Special case for opening RootDirectory */
 267     if (!name_tmp.len) goto done;
 268
 269     while ((obj = parent->ops->lookup_name( parent, &name_tmp, attr )))
 270     {
 271         /* move to the next element */
 272         release_object ( parent );
 273         parent = obj;
 274     }
 275     if (get_error())
 276     {
 277         release_object( parent );
 278         return NULL;
 279     }
 280
 281     done:
 282     if (name_left) *name_left = name_tmp;
 283     return parent;
 284 }
 285
 286 /* create a named (if name is present) or unnamed object. */
 287 void *create_named_object_dir( struct directory *root, const struct unicode_str *name,
 288                                unsigned int attributes, const struct object_ops *ops )
 289 {
 290     struct object *obj, *new_obj = NULL;
 291     struct unicode_str new_name;
 292
 293     if (!name || !name->len)
 294     {
 295         if ((new_obj = alloc_object( ops ))) clear_error();
 296         return new_obj;
 297     }
 298
 299     if (!(obj = find_object_dir( root, name, attributes, &new_name ))) return NULL;
 300     if (!new_name.len)
 301     {
 302         if (attributes & OBJ_OPENIF && obj->ops == ops)
 303             set_error( STATUS_OBJECT_NAME_EXISTS );
 304         else
 305         {
 306             release_object( obj );
 307             obj = NULL;
 308             if (attributes & OBJ_OPENIF)
 309                 set_error( STATUS_OBJECT_TYPE_MISMATCH );
 310             else
 311                 set_error( STATUS_OBJECT_NAME_COLLISION );
 312         }
 313         return obj;
 314     }
 315
 316     /* ATM we can't insert objects into anything else but directories */
 317     if (obj->ops != &directory_ops)
 318         set_error( STATUS_OBJECT_TYPE_MISMATCH );
 319     else
 320     {
 321         struct directory *dir = (struct directory *)obj;
 322         if ((new_obj = create_object( dir->entries, ops, &new_name, &dir->obj )))
 323             clear_error();
 324     }
 325
 326     release_object( obj );
 327     return new_obj;
 328 }
 329
 330 /* open a new handle to an existing object */
 331 void *open_object_dir( struct directory *root, const struct unicode_str *name,
 332                        unsigned int attr, const struct object_ops *ops )
 333 {
 334     struct unicode_str name_left;
 335     struct object *obj;
 336
 337     if ((obj = find_object_dir( root, name, attr, &name_left )))
 338     {
 339         if (name_left.len) /* not fully parsed */
 340             set_error( STATUS_OBJECT_NAME_NOT_FOUND );
 341         else if (ops && obj->ops != ops)
 342             set_error( STATUS_OBJECT_TYPE_MISMATCH );
 343         else
 344             return obj;
 345
 346         release_object( obj );
 347     }
 348     return NULL;
 349 }
 350
 351 /* retrieve an object type, creating it if needed */
 352 struct object_type *get_object_type( const struct unicode_str *name )
 353 {
 354     struct object_type *type;
 355
 356     if ((type = open_object_dir( dir_objtype, name, 0, &object_type_ops )))
 357         return type;
 358
 359     if ((type = create_named_object_dir( dir_objtype, name, 0, &object_type_ops )))
 360     {
 361         grab_object( type );
 362         make_object_static( &type->obj );
 363         clear_error();
 364     }
 365     return type;
 366 }
 367
 368 /* Global initialization */
 369
 370 void init_directories(void)
 371 {
 372     /* Directories */
 373     static const WCHAR dir_globalW[] = {'\\','?','?'};
 374     static const WCHAR dir_driverW[] = {'D','r','i','v','e','r'};
 375     static const WCHAR dir_deviceW[] = {'D','e','v','i','c','e'};
 376     static const WCHAR dir_nullW[] = {'\\','D','e','v','i','c','e','\\','N','u','l','l'};
 377     static const WCHAR dir_basenamedW[] = {'\\','B','a','s','e','N','a','m','e','d','O','b','j','e','c','t','s'};
 378     static const WCHAR dir_named_pipeW[] = {'\\','D','e','v','i','c','e','\\','N','a','m','e','d','P','i','p','e'};
 379     static const WCHAR dir_mailslotW[] = {'\\','D','e','v','i','c','e','\\','M','a','i','l','S','l','o','t'};
 380     static const WCHAR dir_objtypeW[] = {'O','b','j','e','c','t','T','y','p','e','s'};
 381     static const WCHAR dir_sessionsW[] = {'S','e','s','s','i','o','n','s'};
 382     static const WCHAR dir_kernelW[] = {'K','e','r','n','e','l','O','b','j','e','c','t','s'};
 383     static const WCHAR dir_windowsW[] = {'W','i','n','d','o','w','s'};
 384     static const WCHAR dir_winstationsW[] = {'W','i','n','d','o','w','S','t','a','t','i','o','n','s'};
 385     static const struct unicode_str dir_global_str = {dir_globalW, sizeof(dir_globalW)};
 386     static const struct unicode_str dir_driver_str = {dir_driverW, sizeof(dir_driverW)};
 387     static const struct unicode_str dir_device_str = {dir_deviceW, sizeof(dir_deviceW)};
 388     static const struct unicode_str dir_null_str   = {dir_nullW, sizeof(dir_nullW)};
 389     static const struct unicode_str dir_basenamed_str = {dir_basenamedW, sizeof(dir_basenamedW)};
 390     static const struct unicode_str dir_named_pipe_str = {dir_named_pipeW, sizeof(dir_named_pipeW)};
 391     static const struct unicode_str dir_mailslot_str = {dir_mailslotW, sizeof(dir_mailslotW)};
 392     static const struct unicode_str dir_objtype_str = {dir_objtypeW, sizeof(dir_objtypeW)};
 393     static const struct unicode_str dir_sessions_str = {dir_sessionsW, sizeof(dir_sessionsW)};
 394     static const struct unicode_str dir_kernel_str = {dir_kernelW, sizeof(dir_kernelW)};
 395     static const struct unicode_str dir_windows_str = {dir_windowsW, sizeof(dir_windowsW)};
 396     static const struct unicode_str dir_winstations_str = {dir_winstationsW, sizeof(dir_winstationsW)};
 397
 398     /* symlinks */
 399     static const WCHAR link_dosdevW[] = {'D','o','s','D','e','v','i','c','e','s'};
 400     static const WCHAR link_globalW[] = {'G','l','o','b','a','l'};
 401     static const WCHAR link_localW[]  = {'L','o','c','a','l'};
 402     static const WCHAR link_nulW[]    = {'N','U','L'};
 403     static const WCHAR link_pipeW[]   = {'P','I','P','E'};
 404     static const WCHAR link_mailslotW[] = {'M','A','I','L','S','L','O','T'};
 405     static const WCHAR link_0W[]      = {'0'};
 406     static const WCHAR link_sessionW[] = {'S','e','s','s','i','o','n'};
 407     static const WCHAR link_sessionsW[] = {'\\','S','e','s','s','i','o','n','s'};
 408     static const struct unicode_str link_dosdev_str = {link_dosdevW, sizeof(link_dosdevW)};
 409     static const struct unicode_str link_global_str = {link_globalW, sizeof(link_globalW)};
 410     static const struct unicode_str link_local_str  = {link_localW, sizeof(link_localW)};
 411     static const struct unicode_str link_nul_str    = {link_nulW, sizeof(link_nulW)};
 412     static const struct unicode_str link_pipe_str   = {link_pipeW, sizeof(link_pipeW)};
 413     static const struct unicode_str link_mailslot_str = {link_mailslotW, sizeof(link_mailslotW)};
 414     static const struct unicode_str link_0_str      = {link_0W, sizeof(link_0W)};
 415     static const struct unicode_str link_session_str = {link_sessionW, sizeof(link_sessionW)};
 416     static const struct unicode_str link_sessions_str = {link_sessionsW, sizeof(link_sessionsW)};
 417
 418     /* devices */
 419     static const WCHAR named_pipeW[] = {'N','a','m','e','d','P','i','p','e'};
 420     static const WCHAR mailslotW[] = {'M','a','i','l','S','l','o','t'};
 421     static const WCHAR nullW[] = {'N','u','l','l'};
 422     static const struct unicode_str named_pipe_str = {named_pipeW, sizeof(named_pipeW)};
 423     static const struct unicode_str mailslot_str = {mailslotW, sizeof(mailslotW)};
 424     static const struct unicode_str null_str = {nullW, sizeof(nullW)};
 425
 426     /* events */
 427     static const WCHAR event_low_memW[] = {'L','o','w','M','e','m','o','r','y','C','o','n','d','i','t','i','o','n'};
 428     static const WCHAR event_low_pagedW[] = {'L','o','w','P','a','g','e','d','P','o','o','l','C','o','n','d','i','t','i','o','n'};
 429     static const WCHAR event_low_nonpgW[] = {'L','o','w','N','o','n','P','a','g','e','d','P','o','o','l','C','o','n','d','i','t','i','o','n'};
 430     static const WCHAR event_high_memW[] = {'H','i','g','h','M','e','m','o','r','y','C','o','n','d','i','t','i','o','n'};
 431     static const WCHAR event_high_pagedW[] = {'H','i','g','h','P','a','g','e','d','P','o','o','l','C','o','n','d','i','t','i','o','n'};
 432     static const WCHAR event_high_nonpgW[] = {'H','i','g','h','N','o','n','P','a','g','e','d','P','o','o','l','C','o','n','d','i','t','i','o','n'};
 433     static const WCHAR keyed_event_crit_sectW[] = {'C','r','i','t','S','e','c','O','u','t','O','f','M','e','m','o','r','y','E','v','e','n','t'};
 434     static const struct unicode_str kernel_events[] =
 435     {
 436         { event_low_memW, sizeof(event_low_memW) },
 437         { event_low_pagedW, sizeof(event_low_pagedW) },
 438         { event_low_nonpgW, sizeof(event_low_nonpgW) },
 439         { event_high_memW, sizeof(event_high_memW) },
 440         { event_high_pagedW, sizeof(event_high_pagedW) },
 441         { event_high_nonpgW, sizeof(event_high_nonpgW) }
 442     };
 443     static const struct unicode_str keyed_event_crit_sect_str = {keyed_event_crit_sectW, sizeof(keyed_event_crit_sectW)};
 444
 445     struct directory *dir_driver, *dir_device, *dir_global, *dir_basenamed, *dir_sessions, *dir_kernel, *dir_windows, *dir_winstation;
 446     struct symlink *link_dosdev, *link_global1, *link_global2, *link_local, *link_nul, *link_pipe, *link_mailslot, *link_0, *link_session;
 447     struct keyed_event *keyed_event;
 448     unsigned int i;
 449
 450     root_directory = create_directory( NULL, NULL, 0, HASH_SIZE, NULL );
 451     dir_driver     = create_directory( root_directory, &dir_driver_str, 0, HASH_SIZE, NULL );
 452     dir_device     = create_directory( root_directory, &dir_device_str, 0, HASH_SIZE, NULL );
 453     dir_objtype    = create_directory( root_directory, &dir_objtype_str, 0, HASH_SIZE, NULL );
 454     dir_sessions   = create_directory( root_directory, &dir_sessions_str, 0, HASH_SIZE, NULL );
 455     dir_kernel     = create_directory( root_directory, &dir_kernel_str, 0, HASH_SIZE, NULL );
 456     dir_windows    = create_directory( root_directory, &dir_windows_str, 0, HASH_SIZE, NULL );
 457     dir_winstation = create_directory( dir_windows, &dir_winstations_str, 0, HASH_SIZE, NULL );
 458     make_object_static( &root_directory->obj );
 459     make_object_static( &dir_driver->obj );
 460     make_object_static( &dir_objtype->obj );
 461     make_object_static( &dir_winstation->obj );
 462
 463     dir_global     = create_directory( NULL, &dir_global_str, 0, HASH_SIZE, NULL );
 464     /* use a larger hash table for this one since it can contain a lot of objects */
 465     dir_basenamed  = create_directory( NULL, &dir_basenamed_str, 0, 37, NULL );
 466
 467     /* devices */
 468     create_named_pipe_device( dir_device, &named_pipe_str );
 469     create_mailslot_device( dir_device, &mailslot_str );
 470     create_unix_device( dir_device, &null_str, "/dev/null" );
 471
 472     /* symlinks */
 473     link_dosdev    = create_symlink( root_directory, &link_dosdev_str, 0, &dir_global_str, NULL );
 474     link_global1   = create_symlink( dir_global, &link_global_str, 0, &dir_global_str, NULL );
 475     link_global2   = create_symlink( dir_basenamed, &link_global_str, 0, &dir_basenamed_str, NULL );
 476     link_local     = create_symlink( dir_basenamed, &link_local_str, 0, &dir_basenamed_str, NULL );
 477     link_nul       = create_symlink( dir_global, &link_nul_str, 0, &dir_null_str, NULL );
 478     link_pipe      = create_symlink( dir_global, &link_pipe_str, 0, &dir_named_pipe_str, NULL );
 479     link_mailslot  = create_symlink( dir_global, &link_mailslot_str, 0, &dir_mailslot_str, NULL );
 480     link_0         = create_symlink( dir_sessions, &link_0_str, 0, &dir_basenamed_str, NULL );
 481     link_session   = create_symlink( dir_basenamed, &link_session_str, 0, &link_sessions_str, NULL );
 482     make_object_static( (struct object *)link_dosdev );
 483     make_object_static( (struct object *)link_global1 );
 484     make_object_static( (struct object *)link_global2 );
 485     make_object_static( (struct object *)link_local );
 486     make_object_static( (struct object *)link_nul );
 487     make_object_static( (struct object *)link_pipe );
 488     make_object_static( (struct object *)link_mailslot );
 489     make_object_static( (struct object *)link_0 );
 490     make_object_static( (struct object *)link_session );
 491
 492     /* events */
 493     for (i = 0; i < sizeof(kernel_events)/sizeof(kernel_events[0]); i++)
 494     {
 495         struct event *event = create_event( dir_kernel, &kernel_events[i], 0, 1, 0, NULL );
 496         make_object_static( (struct object *)event );
 497     }
 498     keyed_event = create_keyed_event( dir_kernel, &keyed_event_crit_sect_str, 0, NULL );
 499     make_object_static( (struct object *)keyed_event );
 500
 501     /* the objects hold references so we can release these directories */
 502     release_object( dir_global );
 503     release_object( dir_device );
 504     release_object( dir_basenamed );
 505     release_object( dir_sessions );
 506     release_object( dir_kernel );
 507     release_object( dir_windows );
 508 }
 509
 510 /* create a directory object */
 511 DECL_HANDLER(create_directory)
 512 {
 513     struct unicode_str name;
 514     struct directory *dir, *root = NULL;
 515     const struct security_descriptor *sd;
 516     const struct object_attributes *objattr = get_req_object_attributes( &sd, &name );
 517
 518     if (!objattr) return;
 519     if (objattr->rootdir && !(root = get_directory_obj( current->process, objattr->rootdir, 0 ))) return;
 520
 521     if ((dir = create_directory( root, &name, objattr->attributes, HASH_SIZE, sd )))
 522     {
 523         reply->handle = alloc_handle( current->process, dir, req->access, objattr->attributes );
 524         release_object( dir );
 525     }
 526
 527     if (root) release_object( root );
 528 }
 529
 530 /* open a directory object */
 531 DECL_HANDLER(open_directory)
 532 {
 533     struct unicode_str name;
 534     struct directory *dir, *root = NULL;
 535
 536     get_req_unicode_str( &name );
 537     if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
 538         return;
 539
 540     if ((dir = open_object_dir( root, &name, req->attributes, &directory_ops )))
 541     {
 542         reply->handle = alloc_handle( current->process, &dir->obj, req->access, req->attributes );
 543         release_object( dir );
 544     }
 545
 546     if (root) release_object( root );
 547 }
 548
 549 /* get a directory entry by index */
 550 DECL_HANDLER(get_directory_entry)
 551 {
 552     struct directory *dir = get_directory_obj( current->process, req->handle, DIRECTORY_QUERY );
 553     if (dir)
 554     {
 555         struct object *obj = find_object_index( dir->entries, req->index );
 556         if (obj)
 557         {
 558             data_size_t name_len, type_len = 0;
 559             const WCHAR *type_name = NULL;
 560             const WCHAR *name = get_object_name( obj, &name_len );
 561             struct object_type *type = obj->ops->get_type( obj );
 562
 563             if (type) type_name = get_object_name( &type->obj, &type_len );
 564
 565             if (name_len + type_len <= get_reply_max_size())
 566             {
 567                 void *ptr = set_reply_data_size( name_len + type_len );
 568                 if (ptr)
 569                 {
 570                     reply->name_len = name_len;
 571                     memcpy( ptr, name, name_len );
 572                     memcpy( (char *)ptr + name_len, type_name, type_len );
 573                 }
 574             }
 575             else set_error( STATUS_BUFFER_OVERFLOW );
 576
 577             if (type) release_object( type );
 578             release_object( obj );
 579         }
 580         release_object( dir );
 581     }
 582 }
 583
 584 /* unlink a named object */
 585 DECL_HANDLER(unlink_object)
 586 {
 587     struct object *obj = get_handle_obj( current->process, req->handle, 0, NULL );
 588
 589     if (obj)
 590     {
 591         unlink_named_object( obj );
 592         release_object( obj );
 593     }
 594 }
 595
 596 /* query object type name information */
 597 DECL_HANDLER(get_object_type)
 598 {
 599     struct object *obj;
 600     struct object_type *type;
 601     const WCHAR *name;
 602
 603     if (!(obj = get_handle_obj( current->process, req->handle, 0, NULL ))) return;
 604
 605     if ((type = obj->ops->get_type( obj )))
 606     {
 607         if ((name = get_object_name( &type->obj, &reply->total )))
 608             set_reply_data( name, min( reply->total, get_reply_max_size() ) );
 609         release_object( type );
 610     }
 611     release_object( obj );
 612 }