directory.c 19.7 KB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482
/*
 * Server-side directory object management
 *
 * Copyright (C) 2005 Vitaliy Margolen
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 *
 */

#include "config.h"
#include "wine/port.h"

#include <assert.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>

#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "winternl.h"
#include "ddk/wdm.h"

#include "handle.h"
#include "request.h"
#include "process.h"
#include "file.h"
#include "unicode.h"

#define HASH_SIZE 7  /* default hash size */

struct object_type
{
    struct object     obj;        /* object header */
};

static void object_type_dump( struct object *obj, int verbose );
static struct object_type *object_type_get_type( struct object *obj );

static const struct object_ops object_type_ops =
{
    sizeof(struct object_type),   /* size */
    object_type_dump,             /* dump */
    object_type_get_type,         /* get_type */
    no_add_queue,                 /* add_queue */
    NULL,                         /* remove_queue */
    NULL,                         /* signaled */
    NULL,                         /* satisfied */
    no_signal,                    /* signal */
    no_get_fd,                    /* get_fd */
    no_map_access,                /* map_access */
    default_get_sd,               /* get_sd */
    default_set_sd,               /* set_sd */
    no_lookup_name,               /* lookup_name */
    directory_link_name,          /* link_name */
    default_unlink_name,          /* unlink_name */
    no_open_file,                 /* open_file */
    no_close_handle,              /* close_handle */
    no_destroy                    /* destroy */
};


struct directory
{
    struct object     obj;        /* object header */
    struct namespace *entries;    /* directory's name space */
};

static void directory_dump( struct object *obj, int verbose );
static struct object_type *directory_get_type( struct object *obj );
static struct object *directory_lookup_name( struct object *obj, struct unicode_str *name,
                                             unsigned int attr );
static void directory_destroy( struct object *obj );

static const struct object_ops directory_ops =
{
    sizeof(struct directory),     /* size */
    directory_dump,               /* dump */
    directory_get_type,           /* get_type */
    no_add_queue,                 /* add_queue */
    NULL,                         /* remove_queue */
    NULL,                         /* signaled */
    NULL,                         /* satisfied */
    no_signal,                    /* signal */
    no_get_fd,                    /* get_fd */
    default_fd_map_access,        /* map_access */
    default_get_sd,               /* get_sd */
    default_set_sd,               /* set_sd */
    directory_lookup_name,        /* lookup_name */
    directory_link_name,          /* link_name */
    default_unlink_name,          /* unlink_name */
    no_open_file,                 /* open_file */
    no_close_handle,              /* close_handle */
    directory_destroy             /* destroy */
};

static struct directory *root_directory;
static struct directory *dir_objtype;


static void object_type_dump( struct object *obj, int verbose )
{
    fputs( "Object type\n", stderr );
}

static struct object_type *object_type_get_type( struct object *obj )
{
    static const WCHAR name[] = {'O','b','j','e','c','t','T','y','p','e'};
    static const struct unicode_str str = { name, sizeof(name) };
    return get_object_type( &str );
}

static void directory_dump( struct object *obj, int verbose )
{
    fputs( "Directory\n", stderr );
}

static struct object_type *directory_get_type( struct object *obj )
{
    static const WCHAR name[] = {'D','i','r','e','c','t','o','r','y'};
    static const struct unicode_str str = { name, sizeof(name) };
    return get_object_type( &str );
}

static struct object *directory_lookup_name( struct object *obj, struct unicode_str *name,
                                             unsigned int attr )
{
    struct directory *dir = (struct directory *)obj;
    struct object *found;
    struct unicode_str tmp;
    const WCHAR *p;

    assert( obj->ops == &directory_ops );

    if (!name) return NULL;  /* open the directory itself */

    if (!(p = memchrW( name->str, '\\', name->len / sizeof(WCHAR) )))
        /* Last element in the path name */
        tmp.len = name->len;
    else
        tmp.len = (p - name->str) * sizeof(WCHAR);

    tmp.str = name->str;
    if ((found = find_object( dir->entries, &tmp, attr )))
    {
        /* Skip trailing \\ */
        if (p)
        {
            p++;
            tmp.len += sizeof(WCHAR);
        }
        /* Move to the next element*/
        name->str = p;
        name->len -= tmp.len;
        return found;
    }

    if (name->str)  /* not the last element */
    {
        if (tmp.len == 0) /* Double backslash */
            set_error( STATUS_OBJECT_NAME_INVALID );
        else if (p)  /* Path still has backslashes */
            set_error( STATUS_OBJECT_PATH_NOT_FOUND );
    }
    return NULL;
}

int directory_link_name( struct object *obj, struct object_name *name, struct object *parent )
{
    struct directory *dir = (struct directory *)parent;

    if (parent->ops != &directory_ops)
    {
        set_error( STATUS_OBJECT_TYPE_MISMATCH );
        return 0;
    }
    namespace_add( dir->entries, name );
    name->parent = grab_object( parent );
    return 1;
}

static void directory_destroy( struct object *obj )
{
    struct directory *dir = (struct directory *)obj;
    assert( obj->ops == &directory_ops );
    free( dir->entries );
}

static struct directory *create_directory( struct object *root, const struct unicode_str *name,
                                           unsigned int attr, unsigned int hash_size,
                                           const struct security_descriptor *sd )
{
    struct directory *dir;

    if ((dir = create_named_object( root, &directory_ops, name, attr, sd )) &&
        get_error() != STATUS_OBJECT_NAME_EXISTS)
    {
        if (!(dir->entries = create_namespace( hash_size )))
        {
            release_object( dir );
            return NULL;
        }
    }
    return dir;
}

struct object *get_root_directory(void)
{
    return grab_object( root_directory );
}

/* return a directory object for creating/opening some object; no access rights are required */
struct object *get_directory_obj( struct process *process, obj_handle_t handle )
{
    return get_handle_obj( process, handle, 0, &directory_ops );
}

/* retrieve an object type, creating it if needed */
struct object_type *get_object_type( const struct unicode_str *name )
{
    struct object_type *type;

    if ((type = create_named_object( &dir_objtype->obj, &object_type_ops, name, OBJ_OPENIF, NULL )))
    {
        if (get_error() != STATUS_OBJECT_NAME_EXISTS)
        {
            grab_object( type );
            make_object_static( &type->obj );
        }
        clear_error();
    }
    return type;
}

/* Global initialization */

void init_directories(void)
{
    /* Directories */
    static const WCHAR dir_globalW[] = {'\\','?','?'};
    static const WCHAR dir_driverW[] = {'D','r','i','v','e','r'};
    static const WCHAR dir_deviceW[] = {'D','e','v','i','c','e'};
    static const WCHAR dir_nullW[] = {'\\','D','e','v','i','c','e','\\','N','u','l','l'};
    static const WCHAR dir_basenamedW[] = {'\\','B','a','s','e','N','a','m','e','d','O','b','j','e','c','t','s'};
    static const WCHAR dir_named_pipeW[] = {'\\','D','e','v','i','c','e','\\','N','a','m','e','d','P','i','p','e'};
    static const WCHAR dir_mailslotW[] = {'\\','D','e','v','i','c','e','\\','M','a','i','l','S','l','o','t'};
    static const WCHAR dir_objtypeW[] = {'O','b','j','e','c','t','T','y','p','e','s'};
    static const WCHAR dir_sessionsW[] = {'S','e','s','s','i','o','n','s'};
    static const WCHAR dir_kernelW[] = {'K','e','r','n','e','l','O','b','j','e','c','t','s'};
    static const WCHAR dir_windowsW[] = {'W','i','n','d','o','w','s'};
    static const WCHAR dir_winstationsW[] = {'W','i','n','d','o','w','S','t','a','t','i','o','n','s'};
    static const struct unicode_str dir_global_str = {dir_globalW, sizeof(dir_globalW)};
    static const struct unicode_str dir_driver_str = {dir_driverW, sizeof(dir_driverW)};
    static const struct unicode_str dir_device_str = {dir_deviceW, sizeof(dir_deviceW)};
    static const struct unicode_str dir_null_str   = {dir_nullW, sizeof(dir_nullW)};
    static const struct unicode_str dir_basenamed_str = {dir_basenamedW, sizeof(dir_basenamedW)};
    static const struct unicode_str dir_named_pipe_str = {dir_named_pipeW, sizeof(dir_named_pipeW)};
    static const struct unicode_str dir_mailslot_str = {dir_mailslotW, sizeof(dir_mailslotW)};
    static const struct unicode_str dir_objtype_str = {dir_objtypeW, sizeof(dir_objtypeW)};
    static const struct unicode_str dir_sessions_str = {dir_sessionsW, sizeof(dir_sessionsW)};
    static const struct unicode_str dir_kernel_str = {dir_kernelW, sizeof(dir_kernelW)};
    static const struct unicode_str dir_windows_str = {dir_windowsW, sizeof(dir_windowsW)};
    static const struct unicode_str dir_winstations_str = {dir_winstationsW, sizeof(dir_winstationsW)};

    /* symlinks */
    static const WCHAR link_dosdevW[] = {'D','o','s','D','e','v','i','c','e','s'};
    static const WCHAR link_globalW[] = {'G','l','o','b','a','l'};
    static const WCHAR link_localW[]  = {'L','o','c','a','l'};
    static const WCHAR link_nulW[]    = {'N','U','L'};
    static const WCHAR link_pipeW[]   = {'P','I','P','E'};
    static const WCHAR link_mailslotW[] = {'M','A','I','L','S','L','O','T'};
    static const WCHAR link_0W[]      = {'0'};
    static const WCHAR link_sessionW[] = {'S','e','s','s','i','o','n'};
    static const WCHAR link_sessionsW[] = {'\\','S','e','s','s','i','o','n','s'};
    static const struct unicode_str link_dosdev_str = {link_dosdevW, sizeof(link_dosdevW)};
    static const struct unicode_str link_global_str = {link_globalW, sizeof(link_globalW)};
    static const struct unicode_str link_local_str  = {link_localW, sizeof(link_localW)};
    static const struct unicode_str link_nul_str    = {link_nulW, sizeof(link_nulW)};
    static const struct unicode_str link_pipe_str   = {link_pipeW, sizeof(link_pipeW)};
    static const struct unicode_str link_mailslot_str = {link_mailslotW, sizeof(link_mailslotW)};
    static const struct unicode_str link_0_str      = {link_0W, sizeof(link_0W)};
    static const struct unicode_str link_session_str = {link_sessionW, sizeof(link_sessionW)};
    static const struct unicode_str link_sessions_str = {link_sessionsW, sizeof(link_sessionsW)};

    /* devices */
    static const WCHAR named_pipeW[] = {'N','a','m','e','d','P','i','p','e'};
    static const WCHAR mailslotW[] = {'M','a','i','l','S','l','o','t'};
    static const WCHAR nullW[] = {'N','u','l','l'};
    static const struct unicode_str named_pipe_str = {named_pipeW, sizeof(named_pipeW)};
    static const struct unicode_str mailslot_str = {mailslotW, sizeof(mailslotW)};
    static const struct unicode_str null_str = {nullW, sizeof(nullW)};

    /* events */
    static const WCHAR event_low_memW[] = {'L','o','w','M','e','m','o','r','y','C','o','n','d','i','t','i','o','n'};
    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'};
    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'};
    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'};
    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'};
    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'};
    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'};
    static const struct unicode_str kernel_events[] =
    {
        { event_low_memW, sizeof(event_low_memW) },
        { event_low_pagedW, sizeof(event_low_pagedW) },
        { event_low_nonpgW, sizeof(event_low_nonpgW) },
        { event_high_memW, sizeof(event_high_memW) },
        { event_high_pagedW, sizeof(event_high_pagedW) },
        { event_high_nonpgW, sizeof(event_high_nonpgW) }
    };
    static const struct unicode_str keyed_event_crit_sect_str = {keyed_event_crit_sectW, sizeof(keyed_event_crit_sectW)};

    struct directory *dir_driver, *dir_device, *dir_global, *dir_basenamed, *dir_sessions, *dir_kernel, *dir_windows, *dir_winstation;
    struct symlink *link_dosdev, *link_global1, *link_global2, *link_local, *link_nul, *link_pipe, *link_mailslot, *link_0, *link_session;
    struct keyed_event *keyed_event;
    unsigned int i;

    root_directory = create_directory( NULL, NULL, 0, HASH_SIZE, NULL );
    dir_driver     = create_directory( &root_directory->obj, &dir_driver_str, 0, HASH_SIZE, NULL );
    dir_device     = create_directory( &root_directory->obj, &dir_device_str, 0, HASH_SIZE, NULL );
    dir_objtype    = create_directory( &root_directory->obj, &dir_objtype_str, 0, HASH_SIZE, NULL );
    dir_sessions   = create_directory( &root_directory->obj, &dir_sessions_str, 0, HASH_SIZE, NULL );
    dir_kernel     = create_directory( &root_directory->obj, &dir_kernel_str, 0, HASH_SIZE, NULL );
    dir_windows    = create_directory( &root_directory->obj, &dir_windows_str, 0, HASH_SIZE, NULL );
    dir_winstation = create_directory( &dir_windows->obj, &dir_winstations_str, 0, HASH_SIZE, NULL );
    make_object_static( &root_directory->obj );
    make_object_static( &dir_driver->obj );
    make_object_static( &dir_objtype->obj );
    make_object_static( &dir_winstation->obj );

    dir_global     = create_directory( NULL, &dir_global_str, 0, HASH_SIZE, NULL );
    /* use a larger hash table for this one since it can contain a lot of objects */
    dir_basenamed  = create_directory( NULL, &dir_basenamed_str, 0, 37, NULL );

    /* devices */
    create_named_pipe_device( &dir_device->obj, &named_pipe_str );
    create_mailslot_device( &dir_device->obj, &mailslot_str );
    create_unix_device( &dir_device->obj, &null_str, "/dev/null" );

    /* symlinks */
    link_dosdev    = create_symlink( &root_directory->obj, &link_dosdev_str, 0, &dir_global_str, NULL );
    link_global1   = create_symlink( &dir_global->obj, &link_global_str, 0, &dir_global_str, NULL );
    link_global2   = create_symlink( &dir_basenamed->obj, &link_global_str, 0, &dir_basenamed_str, NULL );
    link_local     = create_symlink( &dir_basenamed->obj, &link_local_str, 0, &dir_basenamed_str, NULL );
    link_nul       = create_symlink( &dir_global->obj, &link_nul_str, 0, &dir_null_str, NULL );
    link_pipe      = create_symlink( &dir_global->obj, &link_pipe_str, 0, &dir_named_pipe_str, NULL );
    link_mailslot  = create_symlink( &dir_global->obj, &link_mailslot_str, 0, &dir_mailslot_str, NULL );
    link_0         = create_symlink( &dir_sessions->obj, &link_0_str, 0, &dir_basenamed_str, NULL );
    link_session   = create_symlink( &dir_basenamed->obj, &link_session_str, 0, &link_sessions_str, NULL );
    make_object_static( (struct object *)link_dosdev );
    make_object_static( (struct object *)link_global1 );
    make_object_static( (struct object *)link_global2 );
    make_object_static( (struct object *)link_local );
    make_object_static( (struct object *)link_nul );
    make_object_static( (struct object *)link_pipe );
    make_object_static( (struct object *)link_mailslot );
    make_object_static( (struct object *)link_0 );
    make_object_static( (struct object *)link_session );

    /* events */
    for (i = 0; i < sizeof(kernel_events)/sizeof(kernel_events[0]); i++)
    {
        struct event *event = create_event( &dir_kernel->obj, &kernel_events[i], 0, 1, 0, NULL );
        make_object_static( (struct object *)event );
    }
    keyed_event = create_keyed_event( &dir_kernel->obj, &keyed_event_crit_sect_str, 0, NULL );
    make_object_static( (struct object *)keyed_event );

    /* the objects hold references so we can release these directories */
    release_object( dir_global );
    release_object( dir_device );
    release_object( dir_basenamed );
    release_object( dir_sessions );
    release_object( dir_kernel );
    release_object( dir_windows );
}

/* create a directory object */
DECL_HANDLER(create_directory)
{
    struct unicode_str name;
    struct object *root;
    struct directory *dir;
    const struct security_descriptor *sd;
    const struct object_attributes *objattr = get_req_object_attributes( &sd, &name, &root );

    if (!objattr) return;

    if ((dir = create_directory( root, &name, objattr->attributes, HASH_SIZE, sd )))
    {
        reply->handle = alloc_handle( current->process, dir, req->access, objattr->attributes );
        release_object( dir );
    }

    if (root) release_object( root );
}

/* open a directory object */
DECL_HANDLER(open_directory)
{
    struct unicode_str name = get_req_unicode_str();

    reply->handle = open_object( current->process, req->rootdir, req->access,
                                 &directory_ops, &name, req->attributes );
}

/* get a directory entry by index */
DECL_HANDLER(get_directory_entry)
{
    struct directory *dir = (struct directory *)get_handle_obj( current->process, req->handle,
                                                                DIRECTORY_QUERY, &directory_ops );
    if (dir)
    {
        struct object *obj = find_object_index( dir->entries, req->index );
        if (obj)
        {
            data_size_t name_len, type_len = 0;
            const WCHAR *type_name = NULL;
            const WCHAR *name = get_object_name( obj, &name_len );
            struct object_type *type = obj->ops->get_type( obj );

            if (type) type_name = get_object_name( &type->obj, &type_len );

            if (name_len + type_len <= get_reply_max_size())
            {
                void *ptr = set_reply_data_size( name_len + type_len );
                if (ptr)
                {
                    reply->name_len = name_len;
                    memcpy( ptr, name, name_len );
                    memcpy( (char *)ptr + name_len, type_name, type_len );
                }
            }
            else set_error( STATUS_BUFFER_OVERFLOW );

            if (type) release_object( type );
            release_object( obj );
        }
        release_object( dir );
    }
}

/* unlink a named object */
DECL_HANDLER(unlink_object)
{
    struct object *obj = get_handle_obj( current->process, req->handle, 0, NULL );

    if (obj)
    {
        unlink_named_object( obj );
        release_object( obj );
    }
}

/* query object type name information */
DECL_HANDLER(get_object_type)
{
    struct object *obj;
    struct object_type *type;
    const WCHAR *name;

    if (!(obj = get_handle_obj( current->process, req->handle, 0, NULL ))) return;

    if ((type = obj->ops->get_type( obj )))
    {
        if ((name = get_object_name( &type->obj, &reply->total )))
            set_reply_data( name, min( reply->total, get_reply_max_size() ) );
        release_object( type );
    }
    release_object( obj );
}