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398 lines
14 KiB
C
398 lines
14 KiB
C
/*
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* Server-side directory object management
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*
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* Copyright (C) 2005 Vitaliy Margolen
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*
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*/
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#include "config.h"
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#include "wine/port.h"
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#include <assert.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include "ntstatus.h"
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#define WIN32_NO_STATUS
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#include "winternl.h"
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#include "ddk/wdm.h"
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#include "handle.h"
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#include "request.h"
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#include "process.h"
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#include "file.h"
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#include "unicode.h"
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#define HASH_SIZE 7 /* default hash size */
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struct directory
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{
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struct object obj; /* object header */
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struct namespace *entries; /* directory's name space */
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};
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static void directory_dump( struct object *obj, int verbose );
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static struct object *directory_lookup_name( struct object *obj, struct unicode_str *name,
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unsigned int attr );
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static void directory_destroy( struct object *obj );
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static const struct object_ops directory_ops =
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{
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sizeof(struct directory), /* size */
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directory_dump, /* dump */
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no_add_queue, /* add_queue */
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NULL, /* remove_queue */
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NULL, /* signaled */
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NULL, /* satisfied */
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no_signal, /* signal */
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no_get_fd, /* get_fd */
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default_fd_map_access, /* map_access */
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default_get_sd, /* get_sd */
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default_set_sd, /* set_sd */
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directory_lookup_name, /* lookup_name */
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no_open_file, /* open_file */
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no_close_handle, /* close_handle */
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directory_destroy /* destroy */
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};
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static struct directory *root_directory;
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static void directory_dump( struct object *obj, int verbose )
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{
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assert( obj->ops == &directory_ops );
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fputs( "Directory ", stderr );
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dump_object_name( obj );
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fputc( '\n', stderr );
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}
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static struct object *directory_lookup_name( struct object *obj, struct unicode_str *name,
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unsigned int attr )
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{
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struct directory *dir = (struct directory *)obj;
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struct object *found;
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struct unicode_str tmp;
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const WCHAR *p;
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assert( obj->ops == &directory_ops );
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if (!(p = memchrW( name->str, '\\', name->len / sizeof(WCHAR) )))
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/* Last element in the path name */
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tmp.len = name->len;
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else
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tmp.len = (p - name->str) * sizeof(WCHAR);
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tmp.str = name->str;
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if ((found = find_object( dir->entries, &tmp, attr )))
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{
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/* Skip trailing \\ */
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if (p)
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{
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p++;
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tmp.len += sizeof(WCHAR);
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}
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/* Move to the next element*/
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name->str = p;
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name->len -= tmp.len;
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return found;
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}
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if (name->str)
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{
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if (tmp.len == 0) /* Double backslash */
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set_error( STATUS_OBJECT_NAME_INVALID );
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else if (p) /* Path still has backslashes */
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set_error( STATUS_OBJECT_PATH_NOT_FOUND );
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}
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return NULL;
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}
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static void directory_destroy( struct object *obj )
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{
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struct directory *dir = (struct directory *)obj;
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assert( obj->ops == &directory_ops );
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free( dir->entries );
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}
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static struct directory *create_directory( struct directory *root, const struct unicode_str *name,
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unsigned int attr, unsigned int hash_size )
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{
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struct directory *dir;
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if ((dir = create_named_object_dir( root, name, attr, &directory_ops )) &&
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get_error() != STATUS_OBJECT_NAME_EXISTS)
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{
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if (!(dir->entries = create_namespace( hash_size )))
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{
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release_object( dir );
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dir = NULL;
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}
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}
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return dir;
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}
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struct directory *get_directory_obj( struct process *process, obj_handle_t handle, unsigned int access )
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{
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return (struct directory *)get_handle_obj( process, handle, access, &directory_ops );
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}
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/******************************************************************************
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* Find an object by its name in a given root object
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*
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* PARAMS
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* root [I] directory to start search from or NULL to start from \\
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* name [I] object name to search for
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* attr [I] OBJECT_ATTRIBUTES.Attributes
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* name_left [O] [optional] leftover name if object is not found
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*
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* RETURNS
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* NULL: If params are invalid
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* Found: If object with exact name is found returns that object
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* (name_left->len == 0). Object's refcount is incremented
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* Not found: The last matched parent. (name_left->len > 0)
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* Parent's refcount is incremented.
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*/
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struct object *find_object_dir( struct directory *root, const struct unicode_str *name,
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unsigned int attr, struct unicode_str *name_left )
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{
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struct object *obj, *parent;
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struct unicode_str name_tmp;
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if (name) name_tmp = *name;
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else name_tmp.len = 0;
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/* Arguments check:
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* - Either rootdir or name have to be specified
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* - If root is specified path shouldn't start with backslash */
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if (root)
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{
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if (name_tmp.len && name_tmp.str[0] == '\\')
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{
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set_error( STATUS_OBJECT_PATH_SYNTAX_BAD );
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return NULL;
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}
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parent = grab_object( root );
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}
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else
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{
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if (!name_tmp.len || name_tmp.str[0] != '\\')
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{
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set_error( STATUS_OBJECT_PATH_SYNTAX_BAD );
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return NULL;
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}
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parent = grab_object( &root_directory->obj );
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/* skip leading backslash */
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name_tmp.str++;
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name_tmp.len -= sizeof(WCHAR);
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}
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/* Special case for opening RootDirectory */
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if (!name_tmp.len) goto done;
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while ((obj = parent->ops->lookup_name( parent, &name_tmp, attr )))
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{
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/* move to the next element */
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release_object ( parent );
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parent = obj;
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}
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if (get_error())
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{
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release_object( parent );
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return NULL;
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}
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done:
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if (name_left) *name_left = name_tmp;
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return parent;
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}
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/* create a named (if name is present) or unnamed object. */
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void *create_named_object_dir( struct directory *root, const struct unicode_str *name,
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unsigned int attributes, const struct object_ops *ops )
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{
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struct object *obj, *new_obj = NULL;
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struct unicode_str new_name;
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if (!name || !name->len) return alloc_object( ops );
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if (!(obj = find_object_dir( root, name, attributes, &new_name ))) return NULL;
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if (!new_name.len)
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{
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if (attributes & OBJ_OPENIF && obj->ops == ops)
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set_error( STATUS_OBJECT_NAME_EXISTS );
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else
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{
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release_object( obj );
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obj = NULL;
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if (attributes & OBJ_OPENIF)
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set_error( STATUS_OBJECT_TYPE_MISMATCH );
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else
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set_error( STATUS_OBJECT_NAME_COLLISION );
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}
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return obj;
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}
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/* ATM we can't insert objects into anything else but directories */
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if (obj->ops != &directory_ops)
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set_error( STATUS_OBJECT_TYPE_MISMATCH );
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else
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{
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struct directory *dir = (struct directory *)obj;
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if ((new_obj = create_object( dir->entries, ops, &new_name, &dir->obj )))
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clear_error();
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}
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release_object( obj );
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return new_obj;
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}
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/* open a new handle to an existing object */
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void *open_object_dir( struct directory *root, const struct unicode_str *name,
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unsigned int attr, const struct object_ops *ops )
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{
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struct unicode_str name_left;
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struct object *obj;
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if ((obj = find_object_dir( root, name, attr, &name_left )))
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{
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if (name_left.len) /* not fully parsed */
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set_error( STATUS_OBJECT_NAME_NOT_FOUND );
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else if (ops && obj->ops != ops)
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set_error( STATUS_OBJECT_TYPE_MISMATCH );
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else
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return obj;
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release_object( obj );
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}
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return NULL;
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}
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/* Global initialization */
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void init_directories(void)
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{
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/* Directories */
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static const WCHAR dir_globalW[] = {'\\','?','?'};
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static const WCHAR dir_driverW[] = {'D','r','i','v','e','r'};
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static const WCHAR dir_deviceW[] = {'D','e','v','i','c','e'};
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static const WCHAR dir_basenamedW[] = {'\\','B','a','s','e','N','a','m','e','d','O','b','j','e','c','t','s'};
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static const WCHAR dir_named_pipeW[] = {'\\','D','e','v','i','c','e','\\','N','a','m','e','d','P','i','p','e'};
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static const WCHAR dir_mailslotW[] = {'\\','D','e','v','i','c','e','\\','M','a','i','l','S','l','o','t'};
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static const struct unicode_str dir_global_str = {dir_globalW, sizeof(dir_globalW)};
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static const struct unicode_str dir_driver_str = {dir_driverW, sizeof(dir_driverW)};
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static const struct unicode_str dir_device_str = {dir_deviceW, sizeof(dir_deviceW)};
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static const struct unicode_str dir_basenamed_str = {dir_basenamedW, sizeof(dir_basenamedW)};
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static const struct unicode_str dir_named_pipe_str = {dir_named_pipeW, sizeof(dir_named_pipeW)};
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static const struct unicode_str dir_mailslot_str = {dir_mailslotW, sizeof(dir_mailslotW)};
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/* symlinks */
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static const WCHAR link_dosdevW[] = {'D','o','s','D','e','v','i','c','e','s'};
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static const WCHAR link_globalW[] = {'G','l','o','b','a','l'};
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static const WCHAR link_localW[] = {'L','o','c','a','l'};
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static const WCHAR link_pipeW[] = {'P','I','P','E'};
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static const WCHAR link_mailslotW[] = {'M','A','I','L','S','L','O','T'};
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static const struct unicode_str link_dosdev_str = {link_dosdevW, sizeof(link_dosdevW)};
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static const struct unicode_str link_global_str = {link_globalW, sizeof(link_globalW)};
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static const struct unicode_str link_local_str = {link_localW, sizeof(link_localW)};
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static const struct unicode_str link_pipe_str = {link_pipeW, sizeof(link_pipeW)};
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static const struct unicode_str link_mailslot_str = {link_mailslotW, sizeof(link_mailslotW)};
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/* devices */
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static const WCHAR named_pipeW[] = {'N','a','m','e','d','P','i','p','e'};
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static const WCHAR mailslotW[] = {'M','a','i','l','S','l','o','t'};
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static const struct unicode_str named_pipe_str = {named_pipeW, sizeof(named_pipeW)};
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static const struct unicode_str mailslot_str = {mailslotW, sizeof(mailslotW)};
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struct directory *dir_driver, *dir_device, *dir_global, *dir_basenamed;
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struct symlink *link_dosdev, *link_global1, *link_global2, *link_local, *link_pipe, *link_mailslot;
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root_directory = create_directory( NULL, NULL, 0, HASH_SIZE );
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dir_driver = create_directory( root_directory, &dir_driver_str, 0, HASH_SIZE );
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dir_device = create_directory( root_directory, &dir_device_str, 0, HASH_SIZE );
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make_object_static( &root_directory->obj );
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make_object_static( &dir_driver->obj );
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dir_global = create_directory( NULL, &dir_global_str, 0, HASH_SIZE );
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/* use a larger hash table for this one since it can contain a lot of objects */
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dir_basenamed = create_directory( NULL, &dir_basenamed_str, 0, 37 );
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/* devices */
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create_named_pipe_device( dir_device, &named_pipe_str );
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create_mailslot_device( dir_device, &mailslot_str );
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/* symlinks */
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link_dosdev = create_symlink( root_directory, &link_dosdev_str, 0, &dir_global_str );
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link_global1 = create_symlink( dir_global, &link_global_str, 0, &dir_global_str );
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link_global2 = create_symlink( dir_basenamed, &link_global_str, 0, &dir_basenamed_str );
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link_local = create_symlink( dir_basenamed, &link_local_str, 0, &dir_basenamed_str );
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link_pipe = create_symlink( dir_global, &link_pipe_str, 0, &dir_named_pipe_str );
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link_mailslot = create_symlink( dir_global, &link_mailslot_str, 0, &dir_mailslot_str );
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make_object_static( (struct object *)link_dosdev );
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make_object_static( (struct object *)link_global1 );
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make_object_static( (struct object *)link_global2 );
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make_object_static( (struct object *)link_local );
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make_object_static( (struct object *)link_pipe );
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make_object_static( (struct object *)link_mailslot );
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/* the symlinks or devices hold references so we can release these */
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release_object( dir_global );
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release_object( dir_device );
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release_object( dir_basenamed );
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}
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/* create a directory object */
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DECL_HANDLER(create_directory)
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{
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struct unicode_str name;
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struct directory *dir, *root = NULL;
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reply->handle = 0;
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get_req_unicode_str( &name );
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if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
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return;
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if ((dir = create_directory( root, &name, req->attributes, HASH_SIZE )))
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{
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reply->handle = alloc_handle( current->process, dir, req->access, req->attributes );
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release_object( dir );
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}
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if (root) release_object( root );
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}
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/* open a directory object */
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DECL_HANDLER(open_directory)
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{
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struct unicode_str name;
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struct directory *dir, *root = NULL;
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get_req_unicode_str( &name );
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if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
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return;
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if ((dir = open_object_dir( root, &name, req->attributes, &directory_ops )))
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{
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reply->handle = alloc_handle( current->process, &dir->obj, req->access, req->attributes );
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release_object( dir );
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}
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if (root) release_object( root );
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}
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