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Sweden-Number/server/directory.c

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/*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 "object.h"
#include "unicode.h"
#define HASH_SIZE 7 /* default hash size */
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 *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 */
no_add_queue, /* add_queue */
NULL, /* remove_queue */
NULL, /* signaled */
NULL, /* satisfied */
no_signal, /* signal */
no_get_fd, /* get_fd */
directory_lookup_name, /* lookup_name */
no_close_handle, /* close_handle */
directory_destroy /* destroy */
};
static struct directory *root_directory;
static void directory_dump( struct object *obj, int verbose )
{
assert( obj->ops == &directory_ops );
fputs( "Directory ", stderr );
dump_object_name( obj );
fputc( '\n', stderr );
}
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 (!(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)
{
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;
}
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 directory *root, const struct unicode_str *name,
unsigned int attr, unsigned int hash_size )
{
struct directory *dir;
if ((dir = create_named_object_dir( root, name, attr, &directory_ops )) &&
get_error() != STATUS_OBJECT_NAME_EXISTS)
{
if (!(dir->entries = create_namespace( hash_size )))
{
release_object( dir );
dir = NULL;
}
}
return dir;
}
struct directory *get_directory_obj( struct process *process, obj_handle_t handle, unsigned int access )
{
return (struct directory *)get_handle_obj( process, handle, access, &directory_ops );
}
/******************************************************************************
* Find an object by its name in a given root object
*
* PARAMS
* root [I] directory to start search from or NULL to start from \\
* name [I] object name to search for
* attr [I] OBJECT_ATTRIBUTES.Attributes
* name_left [O] [optional] leftover name if object is not found
*
* RETURNS
* NULL: If params are invalid
* Found: If object with exact name is found returns that object
* (name_left->len == 0). Object's refcount is incremented
* Not found: The last matched parent. (name_left->len > 0)
* Parent's refcount is incremented.
*/
struct object *find_object_dir( struct directory *root, const struct unicode_str *name,
unsigned int attr, struct unicode_str *name_left )
{
struct object *obj, *parent;
struct unicode_str name_tmp;
if (name) name_tmp = *name;
else name_tmp.len = 0;
/* Arguments check:
* - Either rootdir or name have to be specified
* - If root is specified path shouldn't start with backslash */
if (root)
{
if (name_tmp.len && name_tmp.str[0] == '\\')
{
set_error( STATUS_OBJECT_PATH_SYNTAX_BAD );
return NULL;
}
parent = grab_object( root );
}
else
{
if (!name_tmp.len || name_tmp.str[0] != '\\')
{
set_error( STATUS_OBJECT_PATH_SYNTAX_BAD );
return NULL;
}
parent = grab_object( &root_directory->obj );
/* skip leading backslash */
name_tmp.str++;
name_tmp.len -= sizeof(WCHAR);
}
/* Special case for opening RootDirectory */
if (!name_tmp.len) goto done;
while ((obj = parent->ops->lookup_name( parent, &name_tmp, attr )))
{
/* move to the next element */
release_object ( parent );
parent = obj;
}
if (get_error())
{
release_object( parent );
return NULL;
}
done:
if (name_left) *name_left = name_tmp;
return parent;
}
/* create a named (if name is present) or unnamed object. */
void *create_named_object_dir( struct directory *root, const struct unicode_str *name,
unsigned int attributes, const struct object_ops *ops )
{
struct object *obj, *new_obj = NULL;
struct unicode_str new_name;
if (!name || !name->len) return alloc_object( ops );
if (!(obj = find_object_dir( root, name, attributes, &new_name ))) return NULL;
if (!new_name.len)
{
if (attributes & OBJ_OPENIF && obj->ops == ops)
set_error( STATUS_OBJECT_NAME_EXISTS );
else
{
release_object( obj );
obj = NULL;
if (attributes & OBJ_OPENIF)
set_error( STATUS_OBJECT_TYPE_MISMATCH );
else
set_error( STATUS_OBJECT_NAME_COLLISION );
}
return obj;
}
/* ATM we can't insert objects into anything else but directories */
if (obj->ops != &directory_ops)
set_error( STATUS_OBJECT_TYPE_MISMATCH );
else
{
struct directory *dir = (struct directory *)obj;
if ((new_obj = create_object( dir->entries, ops, &new_name, &dir->obj )))
clear_error();
}
release_object( obj );
return new_obj;
}
/* open a new handle to an existing object */
void *open_object_dir( struct directory *root, const struct unicode_str *name,
unsigned int attr, const struct object_ops *ops )
{
struct unicode_str name_left;
struct object *obj;
if ((obj = find_object_dir( root, name, attr, &name_left )))
{
if (name_left.len) /* not fully parsed */
set_error( STATUS_OBJECT_NAME_NOT_FOUND );
else if (ops && obj->ops != ops)
set_error( STATUS_OBJECT_TYPE_MISMATCH );
else
return obj;
release_object( obj );
}
return NULL;
}
/* Global initialization */
static struct directory *dir_driver, *dir_device;
static struct symlink *link_dosdev, *link_global1, *link_global2, *link_local;
static struct named_pipe_device *dev_named_pipe;
static struct mailslot_device *dev_mailslot;
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_basenamedW[] = {'\\','B','a','s','e','N','a','m','e','d','O','b','j','e','c','t','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_basenamed_str = {dir_basenamedW, sizeof(dir_basenamedW)};
/* 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 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)};
/* devices */
static const WCHAR pipeW[] = {'P','I','P','E'};
static const WCHAR mailslotW[] = {'M','A','I','L','S','L','O','T'};
static const struct unicode_str pipe_str = {pipeW, sizeof(pipeW)};
static const struct unicode_str mailslot_str = {mailslotW, sizeof(mailslotW)};
struct directory *dir_global, *dir_basenamed;
root_directory = create_directory( NULL, NULL, 0, HASH_SIZE );
dir_driver = create_directory( root_directory, &dir_driver_str, 0, HASH_SIZE );
dir_device = create_directory( root_directory, &dir_device_str, 0, HASH_SIZE );
dir_global = create_directory( NULL, &dir_global_str, 0, HASH_SIZE );
/* 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 );
/* symlinks */
link_dosdev = create_symlink( root_directory, &link_dosdev_str, 0, &dir_global_str );
link_global1 = create_symlink( dir_global, &link_global_str, 0, &dir_global_str );
link_global2 = create_symlink( dir_basenamed, &link_global_str, 0, &dir_basenamed_str );
link_local = create_symlink( dir_basenamed, &link_local_str, 0, &dir_basenamed_str );
/* devices */
dev_named_pipe = create_named_pipe_device( dir_global, &pipe_str );
dev_mailslot = create_mailslot_device( dir_global, &mailslot_str );
/* the symlinks or devices hold references so we can release these */
release_object( dir_global );
release_object( dir_basenamed );
}
void close_directories(void)
{
release_object( dev_named_pipe );
release_object( dev_mailslot );
release_object( link_dosdev );
release_object( link_global1 );
release_object( link_global2 );
release_object( link_local );
release_object( dir_device );
release_object( dir_driver );
release_object( root_directory );
}
/* create a directory object */
DECL_HANDLER(create_directory)
{
struct unicode_str name;
struct directory *dir, *root = NULL;
reply->handle = 0;
get_req_unicode_str( &name );
if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
return;
if ((dir = create_directory( root, &name, req->attributes, HASH_SIZE )))
{
reply->handle = alloc_handle( current->process, dir, req->access,
req->attributes & OBJ_INHERIT );
release_object( dir );
}
if (root) release_object( root );
}
/* open a directory object */
DECL_HANDLER(open_directory)
{
struct unicode_str name;
struct directory *dir, *root = NULL;
get_req_unicode_str( &name );
if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
return;
if ((dir = open_object_dir( root, &name, req->attributes, &directory_ops )))
{
reply->handle = alloc_handle( current->process, &dir->obj, req->access,
req->attributes & OBJ_INHERIT );
release_object( dir );
}
if (root) release_object( root );
}
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