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Sweden-Number/server/winstation.c

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/*
* Server-side window stations and desktops handling
*
* Copyright (C) 2002, 2005 Alexandre Julliard
*
* 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 <stdio.h>
#include <stdarg.h>
#include <sys/types.h>
#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "windef.h"
#include "winbase.h"
#include "winuser.h"
#include "winternl.h"
#include "object.h"
#include "handle.h"
#include "request.h"
#include "process.h"
#include "user.h"
#include "file.h"
#include "security.h"
#define DESKTOP_ALL_ACCESS 0x01ff
static struct list winstation_list = LIST_INIT(winstation_list);
static void winstation_dump( struct object *obj, int verbose );
static int winstation_close_handle( struct object *obj, struct process *process, obj_handle_t handle );
static struct object *winstation_lookup_name( struct object *obj, struct unicode_str *name,
unsigned int attr, struct object *root );
static void winstation_destroy( struct object *obj );
static void desktop_dump( struct object *obj, int verbose );
static int desktop_link_name( struct object *obj, struct object_name *name, struct object *parent );
static int desktop_close_handle( struct object *obj, struct process *process, obj_handle_t handle );
static void desktop_destroy( struct object *obj );
static const WCHAR winstation_name[] = {'W','i','n','d','o','w','S','t','a','t','i','o','n'};
struct type_descr winstation_type =
{
{ winstation_name, sizeof(winstation_name) }, /* name */
STANDARD_RIGHTS_REQUIRED | WINSTA_ALL_ACCESS, /* valid_access */
{ /* mapping */
STANDARD_RIGHTS_READ | WINSTA_READSCREEN | WINSTA_ENUMERATE | WINSTA_READATTRIBUTES | WINSTA_ENUMDESKTOPS,
STANDARD_RIGHTS_WRITE | WINSTA_WRITEATTRIBUTES | WINSTA_CREATEDESKTOP | WINSTA_ACCESSCLIPBOARD,
STANDARD_RIGHTS_EXECUTE | WINSTA_EXITWINDOWS | WINSTA_ACCESSGLOBALATOMS,
STANDARD_RIGHTS_REQUIRED | WINSTA_ALL_ACCESS
},
};
static const struct object_ops winstation_ops =
{
sizeof(struct winstation), /* size */
&winstation_type, /* type */
winstation_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 */
winstation_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 */
winstation_close_handle, /* close_handle */
winstation_destroy /* destroy */
};
static const WCHAR desktop_name[] = {'D','e','s','k','t','o','p'};
struct type_descr desktop_type =
{
{ desktop_name, sizeof(desktop_name) }, /* name */
STANDARD_RIGHTS_REQUIRED | DESKTOP_ALL_ACCESS, /* valid_access */
{ /* mapping */
STANDARD_RIGHTS_READ | DESKTOP_ENUMERATE | DESKTOP_READOBJECTS,
STANDARD_RIGHTS_WRITE | DESKTOP_WRITEOBJECTS | DESKTOP_JOURNALPLAYBACK | DESKTOP_JOURNALRECORD
| DESKTOP_HOOKCONTROL | DESKTOP_CREATEMENU | DESKTOP_CREATEWINDOW,
STANDARD_RIGHTS_EXECUTE | DESKTOP_SWITCHDESKTOP,
STANDARD_RIGHTS_REQUIRED | DESKTOP_ALL_ACCESS
},
};
static const struct object_ops desktop_ops =
{
sizeof(struct desktop), /* size */
&desktop_type, /* type */
desktop_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 */
no_lookup_name, /* lookup_name */
desktop_link_name, /* link_name */
default_unlink_name, /* unlink_name */
no_open_file, /* open_file */
no_kernel_obj_list, /* get_kernel_obj_list */
desktop_close_handle, /* close_handle */
desktop_destroy /* destroy */
};
/* create a winstation object */
static struct winstation *create_winstation( struct object *root, const struct unicode_str *name,
unsigned int attr, unsigned int flags )
{
struct winstation *winstation;
if ((winstation = create_named_object( root, &winstation_ops, name, attr, NULL )))
{
if (get_error() != STATUS_OBJECT_NAME_EXISTS)
{
/* initialize it if it didn't already exist */
winstation->flags = flags;
winstation->clipboard = NULL;
winstation->atom_table = NULL;
list_add_tail( &winstation_list, &winstation->entry );
list_init( &winstation->desktops );
if (!(winstation->desktop_names = create_namespace( 7 )))
{
release_object( winstation );
return NULL;
}
}
else clear_error();
}
return winstation;
}
static void winstation_dump( struct object *obj, int verbose )
{
struct winstation *winstation = (struct winstation *)obj;
fprintf( stderr, "Winstation flags=%x clipboard=%p atoms=%p\n",
winstation->flags, winstation->clipboard, winstation->atom_table );
}
static int winstation_close_handle( struct object *obj, struct process *process, obj_handle_t handle )
{
return (process->winstation != handle);
}
static struct object *winstation_lookup_name( struct object *obj, struct unicode_str *name,
unsigned int attr, struct object *root )
{
struct winstation *winstation = (struct winstation *)obj;
struct object *found;
assert( obj->ops == &winstation_ops );
if (!name) return NULL; /* open the winstation itself */
if (get_path_element( name->str, name->len ) < name->len) /* no backslash allowed in name */
{
set_error( STATUS_OBJECT_PATH_SYNTAX_BAD );
return NULL;
}
if ((found = find_object( winstation->desktop_names, name, attr )))
name->len = 0;
return found;
}
static void winstation_destroy( struct object *obj )
{
struct winstation *winstation = (struct winstation *)obj;
list_remove( &winstation->entry );
if (winstation->clipboard) release_object( winstation->clipboard );
if (winstation->atom_table) release_object( winstation->atom_table );
free( winstation->desktop_names );
}
/* retrieve the process window station, checking the handle access rights */
struct winstation *get_process_winstation( struct process *process, unsigned int access )
{
return (struct winstation *)get_handle_obj( process, process->winstation,
access, &winstation_ops );
}
/* retrieve a pointer to a desktop object */
struct desktop *get_desktop_obj( struct process *process, obj_handle_t handle, unsigned int access )
{
return (struct desktop *)get_handle_obj( process, handle, access, &desktop_ops );
}
/* create a desktop object */
static struct desktop *create_desktop( const struct unicode_str *name, unsigned int attr,
unsigned int flags, struct winstation *winstation )
{
struct desktop *desktop;
if ((desktop = create_named_object( &winstation->obj, &desktop_ops, name, attr, NULL )))
{
if (get_error() != STATUS_OBJECT_NAME_EXISTS)
{
/* initialize it if it didn't already exist */
desktop->flags = flags;
desktop->winstation = (struct winstation *)grab_object( winstation );
desktop->top_window = NULL;
desktop->msg_window = NULL;
desktop->global_hooks = NULL;
desktop->close_timeout = NULL;
desktop->foreground_input = NULL;
desktop->users = 0;
memset( &desktop->cursor, 0, sizeof(desktop->cursor) );
memset( desktop->keystate, 0, sizeof(desktop->keystate) );
list_add_tail( &winstation->desktops, &desktop->entry );
list_init( &desktop->hotkeys );
}
else clear_error();
}
return desktop;
}
static void desktop_dump( struct object *obj, int verbose )
{
struct desktop *desktop = (struct desktop *)obj;
fprintf( stderr, "Desktop flags=%x winstation=%p top_win=%p hooks=%p\n",
desktop->flags, desktop->winstation, desktop->top_window, desktop->global_hooks );
}
static int desktop_link_name( struct object *obj, struct object_name *name, struct object *parent )
{
struct winstation *winstation = (struct winstation *)parent;
if (parent->ops != &winstation_ops)
{
set_error( STATUS_OBJECT_TYPE_MISMATCH );
return 0;
}
if (get_path_element( name->name, name->len ) < name->len) /* no backslash allowed in name */
{
set_error( STATUS_OBJECT_PATH_SYNTAX_BAD );
return 0;
}
namespace_add( winstation->desktop_names, name );
return 1;
}
static int desktop_close_handle( struct object *obj, struct process *process, obj_handle_t handle )
{
struct thread *thread;
/* check if the handle is currently used by the process or one of its threads */
if (process->desktop == handle) return 0;
LIST_FOR_EACH_ENTRY( thread, &process->thread_list, struct thread, proc_entry )
if (thread->desktop == handle) return 0;
return 1;
}
static void desktop_destroy( struct object *obj )
{
struct desktop *desktop = (struct desktop *)obj;
free_hotkeys( desktop, 0 );
if (desktop->top_window) destroy_window( desktop->top_window );
if (desktop->msg_window) destroy_window( desktop->msg_window );
if (desktop->global_hooks) release_object( desktop->global_hooks );
if (desktop->close_timeout) remove_timeout_user( desktop->close_timeout );
list_remove( &desktop->entry );
release_object( desktop->winstation );
}
/* retrieve the thread desktop, checking the handle access rights */
struct desktop *get_thread_desktop( struct thread *thread, unsigned int access )
{
return get_desktop_obj( thread->process, thread->desktop, access );
}
static void close_desktop_timeout( void *private )
{
struct desktop *desktop = private;
desktop->close_timeout = NULL;
unlink_named_object( &desktop->obj ); /* make sure no other process can open it */
post_desktop_message( desktop, WM_CLOSE, 0, 0 ); /* and signal the owner to quit */
}
/* add a user of the desktop and cancel the close timeout */
static void add_desktop_user( struct desktop *desktop )
{
desktop->users++;
if (desktop->close_timeout)
{
remove_timeout_user( desktop->close_timeout );
desktop->close_timeout = NULL;
}
}
/* remove a user of the desktop and start the close timeout if necessary */
static void remove_desktop_user( struct desktop *desktop )
{
struct process *process;
assert( desktop->users > 0 );
desktop->users--;
/* if we have one remaining user, it has to be the manager of the desktop window */
if ((process = get_top_window_owner( desktop )) && desktop->users == process->running_threads && !desktop->close_timeout)
desktop->close_timeout = add_timeout_user( -TICKS_PER_SEC, close_desktop_timeout, desktop );
}
/* set the thread default desktop handle */
void set_thread_default_desktop( struct thread *thread, struct desktop *desktop, obj_handle_t handle )
{
if (thread->desktop) return; /* nothing to do */
thread->desktop = handle;
if (!thread->process->is_system) add_desktop_user( desktop );
}
/* set the process default desktop handle */
void set_process_default_desktop( struct process *process, struct desktop *desktop,
obj_handle_t handle )
{
struct thread *thread;
if (process->desktop == handle) return; /* nothing to do */
process->desktop = handle;
/* set desktop for threads that don't have one yet */
LIST_FOR_EACH_ENTRY( thread, &process->thread_list, struct thread, proc_entry )
set_thread_default_desktop( thread, desktop, handle );
}
/* connect a process to its window station */
void connect_process_winstation( struct process *process, struct thread *parent_thread,
struct process *parent_process )
{
struct winstation *winstation = NULL;
struct desktop *desktop = NULL;
obj_handle_t handle;
/* check for an inherited winstation handle (don't ask...) */
if ((handle = find_inherited_handle( process, &winstation_ops )))
{
winstation = (struct winstation *)get_handle_obj( process, handle, 0, &winstation_ops );
}
else if (parent_process->winstation)
{
handle = duplicate_handle( parent_process, parent_process->winstation,
process, 0, 0, DUPLICATE_SAME_ACCESS );
winstation = (struct winstation *)get_handle_obj( process, handle, 0, &winstation_ops );
}
if (!winstation) goto done;
process->winstation = handle;
if ((handle = find_inherited_handle( process, &desktop_ops )))
{
desktop = get_desktop_obj( process, handle, 0 );
if (!desktop || desktop->winstation != winstation) goto done;
}
else
{
if (parent_thread && parent_thread->desktop)
handle = parent_thread->desktop;
else if (parent_process->desktop)
handle = parent_process->desktop;
else
goto done;
desktop = get_desktop_obj( parent_process, handle, 0 );
if (!desktop || desktop->winstation != winstation) goto done;
handle = duplicate_handle( parent_process, handle, process, 0, 0, DUPLICATE_SAME_ACCESS );
}
if (handle) set_process_default_desktop( process, desktop, handle );
done:
if (desktop) release_object( desktop );
if (winstation) release_object( winstation );
clear_error();
}
/* close the desktop of a given process */
void close_process_desktop( struct process *process )
{
obj_handle_t handle;
if (!(handle = process->desktop)) return;
process->desktop = 0;
close_handle( process, handle );
}
/* release (and eventually close) the desktop of a given thread */
void release_thread_desktop( struct thread *thread, int close )
{
struct desktop *desktop;
obj_handle_t handle;
if (!(handle = thread->desktop)) return;
if (!thread->process->is_system)
{
if (!(desktop = get_desktop_obj( thread->process, handle, 0 ))) clear_error(); /* ignore errors */
else
{
remove_desktop_user( desktop );
release_object( desktop );
}
}
if (close)
{
thread->desktop = 0;
close_handle( thread->process, handle );
}
}
/* create a window station */
DECL_HANDLER(create_winstation)
{
struct winstation *winstation;
struct unicode_str name = get_req_unicode_str();
struct object *root = NULL;
reply->handle = 0;
if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir ))) return;
if ((winstation = create_winstation( root, &name, req->attributes, req->flags )))
{
reply->handle = alloc_handle( current->process, winstation, req->access, req->attributes );
release_object( winstation );
}
if (root) release_object( root );
}
/* open a handle to a window station */
DECL_HANDLER(open_winstation)
{
struct unicode_str name = get_req_unicode_str();
reply->handle = open_object( current->process, req->rootdir, req->access,
&winstation_ops, &name, req->attributes );
}
/* close a window station */
DECL_HANDLER(close_winstation)
{
struct winstation *winstation;
if ((winstation = (struct winstation *)get_handle_obj( current->process, req->handle,
0, &winstation_ops )))
{
if (close_handle( current->process, req->handle )) set_error( STATUS_ACCESS_DENIED );
release_object( winstation );
}
}
/* get the process current window station */
DECL_HANDLER(get_process_winstation)
{
reply->handle = current->process->winstation;
}
/* set the process current window station */
DECL_HANDLER(set_process_winstation)
{
struct winstation *winstation;
if ((winstation = (struct winstation *)get_handle_obj( current->process, req->handle,
0, &winstation_ops )))
{
/* FIXME: should we close the old one? */
current->process->winstation = req->handle;
release_object( winstation );
}
}
/* create a desktop */
DECL_HANDLER(create_desktop)
{
struct desktop *desktop;
struct winstation *winstation;
struct unicode_str name = get_req_unicode_str();
reply->handle = 0;
if (!name.len)
{
set_error( STATUS_INVALID_HANDLE );
return;
}
if ((winstation = get_process_winstation( current->process, WINSTA_CREATEDESKTOP )))
{
if ((desktop = create_desktop( &name, req->attributes, req->flags, winstation )))
{
reply->handle = alloc_handle( current->process, desktop, req->access, req->attributes );
release_object( desktop );
}
release_object( winstation );
}
}
/* open a handle to a desktop */
DECL_HANDLER(open_desktop)
{
struct winstation *winstation;
struct object *obj;
struct unicode_str name = get_req_unicode_str();
/* FIXME: check access rights */
if (!req->winsta)
winstation = get_process_winstation( current->process, 0 );
else
winstation = (struct winstation *)get_handle_obj( current->process, req->winsta, 0, &winstation_ops );
if (!winstation) return;
if ((obj = open_named_object( &winstation->obj, &desktop_ops, &name, req->attributes )))
{
reply->handle = alloc_handle( current->process, obj, req->access, req->attributes );
release_object( obj );
}
release_object( winstation );
}
/* open a handle to current input desktop */
DECL_HANDLER(open_input_desktop)
{
/* FIXME: check access rights */
struct winstation *winstation = get_process_winstation( current->process, 0 );
struct desktop *desktop;
if (!winstation) return;
if (!(winstation->flags & WSF_VISIBLE))
{
set_error( STATUS_ILLEGAL_FUNCTION );
release_object( winstation );
return;
}
if ((desktop = get_desktop_obj( current->process, current->process->desktop, 0 )))
{
reply->handle = alloc_handle( current->process, desktop, req->access, req->attributes );
release_object( desktop );
}
release_object( winstation );
}
/* close a desktop */
DECL_HANDLER(close_desktop)
{
struct desktop *desktop;
/* make sure it is a desktop handle */
if ((desktop = (struct desktop *)get_handle_obj( current->process, req->handle,
0, &desktop_ops )))
{
if (close_handle( current->process, req->handle )) set_error( STATUS_DEVICE_BUSY );
release_object( desktop );
}
}
/* get the thread current desktop */
DECL_HANDLER(get_thread_desktop)
{
struct thread *thread;
if (!(thread = get_thread_from_id( req->tid ))) return;
reply->handle = thread->desktop;
release_object( thread );
}
/* set the thread current desktop */
DECL_HANDLER(set_thread_desktop)
{
struct desktop *old_desktop, *new_desktop;
struct winstation *winstation;
if (!(winstation = get_process_winstation( current->process, 0 /* FIXME: access rights? */ )))
return;
if (!(new_desktop = get_desktop_obj( current->process, req->handle, 0 )))
{
release_object( winstation );
return;
}
if (new_desktop->winstation != winstation)
{
set_error( STATUS_ACCESS_DENIED );
release_object( new_desktop );
release_object( winstation );
return;
}
/* check if we are changing to a new desktop */
if (!(old_desktop = get_desktop_obj( current->process, current->desktop, 0)))
clear_error(); /* ignore error */
/* when changing desktop, we can't have any users on the current one */
if (old_desktop != new_desktop && current->desktop_users > 0)
set_error( STATUS_DEVICE_BUSY );
else
{
current->desktop = req->handle; /* FIXME: should we close the old one? */
if (!current->process->is_system && old_desktop != new_desktop)
{
add_desktop_user( new_desktop );
if (old_desktop) remove_desktop_user( old_desktop );
}
}
if (!current->process->desktop)
set_process_default_desktop( current->process, new_desktop, req->handle );
if (old_desktop != new_desktop && current->queue) detach_thread_input( current );
if (old_desktop) release_object( old_desktop );
release_object( new_desktop );
release_object( winstation );
}
/* get/set information about a user object (window station or desktop) */
DECL_HANDLER(set_user_object_info)
{
struct object *obj;
data_size_t len;
if (!(obj = get_handle_obj( current->process, req->handle, 0, NULL ))) return;
if (obj->ops == &desktop_ops)
{
struct desktop *desktop = (struct desktop *)obj;
reply->is_desktop = 1;
reply->old_obj_flags = desktop->flags;
if (req->flags & SET_USER_OBJECT_SET_FLAGS) desktop->flags = req->obj_flags;
}
else if (obj->ops == &winstation_ops)
{
struct winstation *winstation = (struct winstation *)obj;
reply->is_desktop = 0;
reply->old_obj_flags = winstation->flags;
if (req->flags & SET_USER_OBJECT_SET_FLAGS) winstation->flags = req->obj_flags;
}
else
{
set_error( STATUS_OBJECT_TYPE_MISMATCH );
release_object( obj );
return;
}
if (obj->ops == &desktop_ops && get_reply_max_size() && (req->flags & SET_USER_OBJECT_GET_FULL_NAME))
{
struct desktop *desktop = (struct desktop *)obj;
data_size_t winstation_len, desktop_len;
const WCHAR *winstation_name = get_object_name( &desktop->winstation->obj, &winstation_len );
const WCHAR *desktop_name = get_object_name( obj, &desktop_len );
WCHAR *full_name;
if (!winstation_name) winstation_len = 0;
if (!desktop_name) desktop_len = 0;
len = winstation_len + desktop_len + sizeof(WCHAR);
if ((full_name = mem_alloc( len )))
{
memcpy( full_name, winstation_name, winstation_len );
full_name[winstation_len / sizeof(WCHAR)] = '\\';
memcpy( full_name + winstation_len / sizeof(WCHAR) + 1, desktop_name, desktop_len );
set_reply_data_ptr( full_name, min( len, get_reply_max_size() ));
}
}
else
{
const WCHAR *name = get_object_name( obj, &len );
if (name) set_reply_data( name, min( len, get_reply_max_size() ));
}
release_object( obj );
}
/* enumerate window stations */
DECL_HANDLER(enum_winstation)
{
unsigned int index = 0;
struct winstation *winsta;
const WCHAR *name;
data_size_t len;
LIST_FOR_EACH_ENTRY( winsta, &winstation_list, struct winstation, entry )
{
unsigned int access = WINSTA_ENUMERATE;
if (req->index > index++) continue;
if (!check_object_access( NULL, &winsta->obj, &access )) continue;
clear_error();
reply->next = index;
if ((name = get_object_name( &winsta->obj, &len )))
set_reply_data( name, min( len, get_reply_max_size() ));
return;
}
set_error( STATUS_NO_MORE_ENTRIES );
}
/* enumerate desktops */
DECL_HANDLER(enum_desktop)
{
struct winstation *winstation;
struct desktop *desktop;
unsigned int index = 0;
const WCHAR *name;
data_size_t len;
if (!(winstation = (struct winstation *)get_handle_obj( current->process, req->winstation,
WINSTA_ENUMDESKTOPS, &winstation_ops )))
return;
LIST_FOR_EACH_ENTRY( desktop, &winstation->desktops, struct desktop, entry )
{
unsigned int access = DESKTOP_ENUMERATE;
if (req->index > index++) continue;
if (!desktop->obj.name) continue;
if (!check_object_access( NULL, &desktop->obj, &access )) continue;
if ((name = get_object_name( &desktop->obj, &len )))
set_reply_data( name, min( len, get_reply_max_size() ));
release_object( winstation );
clear_error();
reply->next = index;
return;
}
release_object( winstation );
set_error( STATUS_NO_MORE_ENTRIES );
}
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