Sweden-Number/server/symlink.c

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/*
* Server-side symbolic link 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 <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 "object.h"
#include "unicode.h"
static const WCHAR symlink_name[] = {'S','y','m','b','o','l','i','c','L','i','n','k'};
struct type_descr symlink_type =
{
{ symlink_name, sizeof(symlink_name) }, /* name */
SYMBOLIC_LINK_ALL_ACCESS, /* valid_access */
{ /* mapping */
STANDARD_RIGHTS_READ | SYMBOLIC_LINK_QUERY,
STANDARD_RIGHTS_WRITE,
STANDARD_RIGHTS_EXECUTE | SYMBOLIC_LINK_QUERY,
SYMBOLIC_LINK_ALL_ACCESS
},
};
struct symlink
{
struct object obj; /* object header */
WCHAR *target; /* target of the symlink */
data_size_t len; /* target len in bytes */
};
static void symlink_dump( struct object *obj, int verbose );
static struct object *symlink_lookup_name( struct object *obj, struct unicode_str *name,
unsigned int attr, struct object *root );
static void symlink_destroy( struct object *obj );
static const struct object_ops symlink_ops =
{
sizeof(struct symlink), /* size */
&symlink_type, /* type */
symlink_dump, /* dump */
no_add_queue, /* add_queue */
NULL, /* remove_queue */
NULL, /* signaled */
NULL, /* satisfied */
no_signal, /* signal */
no_get_fd, /* get_fd */
default_map_access, /* map_access */
default_get_sd, /* get_sd */
default_set_sd, /* set_sd */
default_get_full_name, /* get_full_name */
symlink_lookup_name, /* lookup_name */
directory_link_name, /* link_name */
default_unlink_name, /* unlink_name */
no_open_file, /* open_file */
no_kernel_obj_list, /* get_kernel_obj_list */
no_close_handle, /* close_handle */
symlink_destroy /* destroy */
};
static void symlink_dump( struct object *obj, int verbose )
{
struct symlink *symlink = (struct symlink *)obj;
assert( obj->ops == &symlink_ops );
fputs( "Symlink target=\"", stderr );
dump_strW( symlink->target, symlink->len, stderr, "\"\"" );
fputs( "\"\n", stderr );
}
static struct object *symlink_lookup_name( struct object *obj, struct unicode_str *name,
unsigned int attr, struct object *root )
{
struct symlink *symlink = (struct symlink *)obj;
struct unicode_str target_str, name_left;
struct object *target;
assert( obj->ops == &symlink_ops );
if (!name) return NULL;
if (!name->len && (attr & OBJ_OPENLINK)) return NULL;
if (obj == root) return NULL;
target_str.str = symlink->target;
target_str.len = symlink->len;
if ((target = lookup_named_object( NULL, &target_str, attr, &name_left )))
{
if (name_left.len)
{
release_object( target );
target = NULL;
set_error( STATUS_OBJECT_PATH_NOT_FOUND );
}
}
return target;
}
static void symlink_destroy( struct object *obj )
{
struct symlink *symlink = (struct symlink *)obj;
assert( obj->ops == &symlink_ops );
free( symlink->target );
}
struct object *create_symlink( struct object *root, const struct unicode_str *name,
unsigned int attr, const struct unicode_str *target,
const struct security_descriptor *sd )
{
struct symlink *symlink;
if (!target->len)
{
set_error( STATUS_INVALID_PARAMETER );
return NULL;
}
if (!(symlink = create_named_object( root, &symlink_ops, name, attr, sd ))) return NULL;
if (get_error() != STATUS_OBJECT_NAME_EXISTS && !(symlink->target = memdup( target->str, target->len )))
{
release_object( symlink );
return NULL;
}
symlink->len = target->len;
return &symlink->obj;
}
/* create a symlink pointing to an existing object */
struct object *create_obj_symlink( struct object *root, const struct unicode_str *name,
unsigned int attr, struct object *target,
const struct security_descriptor *sd )
{
struct symlink *symlink;
data_size_t len;
WCHAR *target_name;
if (!(target_name = target->ops->get_full_name( target, &len )))
{
set_error( STATUS_INVALID_PARAMETER );
return NULL;
}
if ((symlink = create_named_object( root, &symlink_ops, name, attr, sd )) &&
(get_error() != STATUS_OBJECT_NAME_EXISTS))
{
symlink->target = target_name;
symlink->len = len;
}
else free( target_name );
return &symlink->obj;
}
/* create a symbolic link object */
DECL_HANDLER(create_symlink)
{
struct object *symlink;
struct unicode_str name, target;
struct object *root;
const struct security_descriptor *sd;
const struct object_attributes *objattr = get_req_object_attributes( &sd, &name, &root );
if (!objattr) return;
target.str = get_req_data_after_objattr( objattr, &target.len );
target.len = (target.len / sizeof(WCHAR)) * sizeof(WCHAR);
if ((symlink = create_symlink( root, &name, objattr->attributes, &target, sd )))
{
reply->handle = alloc_handle( current->process, symlink, req->access, objattr->attributes );
release_object( symlink );
}
if (root) release_object( root );
}
/* open a symbolic link object */
DECL_HANDLER(open_symlink)
{
struct unicode_str name = get_req_unicode_str();
reply->handle = open_object( current->process, req->rootdir, req->access,
&symlink_ops, &name, req->attributes | OBJ_OPENLINK );
}
/* query a symbolic link object */
DECL_HANDLER(query_symlink)
{
struct symlink *symlink;
symlink = (struct symlink *)get_handle_obj( current->process, req->handle,
SYMBOLIC_LINK_QUERY, &symlink_ops );
if (!symlink) return;
reply->total = symlink->len;
if (get_reply_max_size() < symlink->len)
set_error( STATUS_BUFFER_TOO_SMALL );
else
set_reply_data( symlink->target, symlink->len );
release_object( symlink );
}