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/*
* Server-side window hooks support
*
* Copyright (C) 2002 Alexandre Julliard
* Copyright (C) 2005 Dmitry Timoshkov
*
* 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 <stdio.h>
#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "windef.h"
#include "winbase.h"
#include "winuser.h"
#include "winternl.h"
#include "object.h"
#include "process.h"
#include "request.h"
#include "user.h"
struct hook_table;
struct hook
{
struct list chain; /* hook chain entry */
user_handle_t handle; /* user handle for this hook */
struct process *process; /* process the hook is set to */
struct thread *thread; /* thread the hook is set to */
struct thread *owner; /* owner of the out of context hook */
struct hook_table *table; /* hook table that contains this hook */
int index; /* hook table index */
int event_min;
int event_max;
int flags;
client_ptr_t proc; /* hook function */
int unicode; /* is it a unicode hook? */
WCHAR *module; /* module name for global hooks */
data_size_t module_size;
};
#define WH_WINEVENT (WH_MAXHOOK+1)
#define NB_HOOKS (WH_WINEVENT-WH_MINHOOK+1)
#define HOOK_ENTRY(p) LIST_ENTRY( (p), struct hook, chain )
struct hook_table
{
struct object obj; /* object header */
struct list hooks[NB_HOOKS]; /* array of hook chains */
int counts[NB_HOOKS]; /* use counts for each hook chain */
};
static void hook_table_dump( struct object *obj, int verbose );
static void hook_table_destroy( struct object *obj );
static const struct object_ops hook_table_ops =
{
sizeof(struct hook_table), /* size */
hook_table_dump, /* dump */
no_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 */
no_open_file, /* open_file */
no_close_handle, /* close_handle */
hook_table_destroy /* destroy */
};
/* create a new hook table */
static struct hook_table *alloc_hook_table(void)
{
struct hook_table *table;
int i;
if ((table = alloc_object( &hook_table_ops )))
{
for (i = 0; i < NB_HOOKS; i++)
{
list_init( &table->hooks[i] );
table->counts[i] = 0;
}
}
return table;
}
static struct hook_table *get_global_hooks( struct thread *thread )
{
struct hook_table *table;
struct desktop *desktop;
if (!thread->desktop) return NULL;
if (!(desktop = get_thread_desktop( thread, 0 ))) return NULL;
table = desktop->global_hooks;
release_object( desktop );
return table;
}
/* create a new hook and add it to the specified table */
static struct hook *add_hook( struct desktop *desktop, struct thread *thread, int index, int global )
{
struct hook *hook;
struct hook_table *table = global ? desktop->global_hooks : get_queue_hooks(thread);
if (!table)
{
if (!(table = alloc_hook_table())) return NULL;
if (global) desktop->global_hooks = table;
else set_queue_hooks( thread, table );
}
if (!(hook = mem_alloc( sizeof(*hook) ))) return NULL;
if (!(hook->handle = alloc_user_handle( hook, USER_HOOK )))
{
free( hook );
return NULL;
}
hook->thread = thread ? (struct thread *)grab_object( thread ) : NULL;
hook->table = table;
hook->index = index;
list_add_head( &table->hooks[index], &hook->chain );
if (thread) thread->desktop_users++;
return hook;
}
/* free a hook, removing it from its chain */
static void free_hook( struct hook *hook )
{
free_user_handle( hook->handle );
free( hook->module );
if (hook->thread)
{
assert( hook->thread->desktop_users > 0 );
hook->thread->desktop_users--;
release_object( hook->thread );
}
if (hook->process) release_object( hook->process );
release_object( hook->owner );
list_remove( &hook->chain );
free( hook );
}
/* find a hook from its index and proc */
static struct hook *find_hook( struct thread *thread, int index, client_ptr_t proc )
{
struct list *p;
struct hook_table *table = get_queue_hooks( thread );
if (table)
{
LIST_FOR_EACH( p, &table->hooks[index] )
{
struct hook *hook = HOOK_ENTRY( p );
if (hook->proc == proc) return hook;
}
}
return NULL;
}
/* get the first hook in the chain */
static inline struct hook *get_first_hook( struct hook_table *table, int index )
{
struct list *elem = list_head( &table->hooks[index] );
return elem ? HOOK_ENTRY( elem ) : NULL;
}
/* check if a given hook should run in the owner thread instead of the current thread */
static inline int run_hook_in_owner_thread( struct hook *hook )
{
if ((hook->index == WH_MOUSE_LL - WH_MINHOOK ||
hook->index == WH_KEYBOARD_LL - WH_MINHOOK))
return hook->owner != current;
return 0;
}
/* check if a given hook should run in the current thread */
static inline int run_hook_in_current_thread( struct hook *hook )
{
if (hook->process && hook->process != current->process) return 0;
if ((hook->flags & WINEVENT_SKIPOWNPROCESS) && hook->process == current->process) return 0;
if (hook->thread && hook->thread != current) return 0;
if ((hook->flags & WINEVENT_SKIPOWNTHREAD) && hook->thread == current) return 0;
/* don't run low-level hooks in processes suspended for debugging */
if (run_hook_in_owner_thread( hook ) && hook->owner->process->suspend) return 0;
return 1;
}
/* find the first non-deleted hook in the chain */
static inline struct hook *get_first_valid_hook( struct hook_table *table, int index,
int event, user_handle_t win,
int object_id, int child_id )
{
struct hook *hook = get_first_hook( table, index );
while (hook)
{
if (hook->proc && run_hook_in_current_thread( hook ))
{
if (event >= hook->event_min && event <= hook->event_max)
{
if (hook->flags & WINEVENT_INCONTEXT) return hook;
/* only winevent hooks may be out of context */
assert(hook->index + WH_MINHOOK == WH_WINEVENT);
post_win_event( hook->owner, event, win, object_id, child_id,
hook->proc, hook->module, hook->module_size,
hook->handle );
}
}
hook = HOOK_ENTRY( list_next( &table->hooks[index], &hook->chain ) );
}
return hook;
}
/* find the next hook in the chain, skipping the deleted ones */
static struct hook *get_next_hook( struct thread *thread, struct hook *hook, int event,
user_handle_t win, int object_id, int child_id )
{
struct hook_table *global_hooks, *table = hook->table;
int index = hook->index;
while ((hook = HOOK_ENTRY( list_next( &table->hooks[index], &hook->chain ) )))
{
if (hook->proc && run_hook_in_current_thread( hook ))
{
if (event >= hook->event_min && event <= hook->event_max)
{
if (hook->flags & WINEVENT_INCONTEXT) return hook;
/* only winevent hooks may be out of context */
assert(hook->index + WH_MINHOOK == WH_WINEVENT);
post_win_event( hook->owner, event, win, object_id, child_id,
hook->proc, hook->module, hook->module_size,
hook->handle );
}
}
}
global_hooks = get_global_hooks( thread );
if (global_hooks && table != global_hooks) /* now search through the global table */
{
hook = get_first_valid_hook( global_hooks, index, event, win, object_id, child_id );
}
return hook;
}
static void hook_table_dump( struct object *obj, int verbose )
{
/* struct hook_table *table = (struct hook_table *)obj; */
fprintf( stderr, "Hook table\n" );
}
static void hook_table_destroy( struct object *obj )
{
int i;
struct hook *hook;
struct hook_table *table = (struct hook_table *)obj;
for (i = 0; i < NB_HOOKS; i++)
{
while ((hook = get_first_hook( table, i )) != NULL) free_hook( hook );
}
}
/* remove a hook, freeing it if the chain is not in use */
static void remove_hook( struct hook *hook )
{
if (hook->table->counts[hook->index])
hook->proc = 0; /* chain is in use, just mark it and return */
else
free_hook( hook );
}
/* release a hook chain, removing deleted hooks if the use count drops to 0 */
static void release_hook_chain( struct hook_table *table, int index )
{
if (!table->counts[index]) /* use count shouldn't already be 0 */
{
set_error( STATUS_INVALID_PARAMETER );
return;
}
if (!--table->counts[index])
{
struct hook *hook = get_first_hook( table, index );
while (hook)
{
struct hook *next = HOOK_ENTRY( list_next( &table->hooks[hook->index], &hook->chain ) );
if (!hook->proc) free_hook( hook );
hook = next;
}
}
}
/* remove all global hooks owned by a given thread */
void remove_thread_hooks( struct thread *thread )
{
struct hook_table *global_hooks = get_global_hooks( thread );
int index;
if (!global_hooks) return;
/* only low-level keyboard/mouse global hooks can be owned by a thread */
for (index = WH_KEYBOARD_LL - WH_MINHOOK; index <= WH_MOUSE_LL - WH_MINHOOK; index++)
{
struct hook *hook = get_first_hook( global_hooks, index );
while (hook)
{
struct hook *next = HOOK_ENTRY( list_next( &global_hooks->hooks[index], &hook->chain ) );
if (hook->thread == thread) remove_hook( hook );
hook = next;
}
}
}
/* get a bitmap of active hooks in a hook table */
static int is_hook_active( struct hook_table *table, int index )
{
struct hook *hook = get_first_hook( table, index );
while (hook)
{
if (hook->proc && run_hook_in_current_thread( hook )) return 1;
hook = HOOK_ENTRY( list_next( &table->hooks[index], &hook->chain ) );
}
return 0;
}
/* get a bitmap of all active hooks for the current thread */
unsigned int get_active_hooks(void)
{
struct hook_table *table = get_queue_hooks( current );
struct hook_table *global_hooks = get_global_hooks( current );
unsigned int ret = 1 << 31; /* set high bit to indicate that the bitmap is valid */
int id;
for (id = WH_MINHOOK; id <= WH_WINEVENT; id++)
{
if ((table && is_hook_active( table, id - WH_MINHOOK )) ||
(global_hooks && is_hook_active( global_hooks, id - WH_MINHOOK )))
ret |= 1 << (id - WH_MINHOOK);
}
return ret;
}
/* return the thread that owns the first global hook */
struct thread *get_first_global_hook( int id )
{
struct hook *hook;
struct hook_table *global_hooks = get_global_hooks( current );
if (!global_hooks) return NULL;
if (!(hook = get_first_valid_hook( global_hooks, id - WH_MINHOOK, EVENT_MIN, 0, 0, 0 ))) return NULL;
return hook->owner;
}
/* set a window hook */
DECL_HANDLER(set_hook)
{
struct process *process = NULL;
struct thread *thread = NULL;
struct desktop *desktop;
struct hook *hook;
WCHAR *module;
int global;
data_size_t module_size = get_req_data_size();
if (!req->proc || req->id < WH_MINHOOK || req->id > WH_WINEVENT)
{
set_error( STATUS_INVALID_PARAMETER );
return;
}
if (!(desktop = get_thread_desktop( current, DESKTOP_HOOKCONTROL ))) return;
if (req->pid && !(process = get_process_from_id( req->pid ))) goto done;
if (req->tid)
{
if (!(thread = get_thread_from_id( req->tid ))) goto done;
if (process && process != thread->process)
{
set_error( STATUS_INVALID_PARAMETER );
goto done;
}
}
if (req->id == WH_KEYBOARD_LL || req->id == WH_MOUSE_LL)
{
/* low-level hardware hooks are special: always global, but without a module */
if (thread)
{
set_error( STATUS_INVALID_PARAMETER );
goto done;
}
module = NULL;
global = 1;
}
else if (!req->tid)
{
/* out of context hooks do not need a module handle */
if (!module_size && (req->flags & WINEVENT_INCONTEXT))
{
set_error( STATUS_INVALID_PARAMETER );
goto done;
}
if (!(module = memdup( get_req_data(), module_size ))) goto done;
global = 1;
}
else
{
/* module is optional only if hook is in current process */
if (!module_size)
{
module = NULL;
if (thread->process != current->process)
{
set_error( STATUS_INVALID_PARAMETER );
goto done;
}
}
else if (!(module = memdup( get_req_data(), module_size ))) goto done;
global = 0;
}
if ((hook = add_hook( desktop, thread, req->id - WH_MINHOOK, global )))
{
hook->owner = (struct thread *)grab_object( current );
hook->process = process ? (struct process *)grab_object( process ) : NULL;
hook->event_min = req->event_min;
hook->event_max = req->event_max;
hook->flags = req->flags;
hook->proc = req->proc;
hook->unicode = req->unicode;
hook->module = module;
hook->module_size = module_size;
reply->handle = hook->handle;
reply->active_hooks = get_active_hooks();
}
else free( module );
done:
if (process) release_object( process );
if (thread) release_object( thread );
release_object( desktop );
}
/* remove a window hook */
DECL_HANDLER(remove_hook)
{
struct hook *hook;
if (req->handle)
{
if (!(hook = get_user_object( req->handle, USER_HOOK )))
{
set_error( STATUS_INVALID_HANDLE );
return;
}
}
else
{
if (!req->proc || req->id < WH_MINHOOK || req->id > WH_WINEVENT)
{
set_error( STATUS_INVALID_PARAMETER );
return;
}
if (!(hook = find_hook( current, req->id - WH_MINHOOK, req->proc )))
{
set_error( STATUS_INVALID_PARAMETER );
return;
}
}
remove_hook( hook );
reply->active_hooks = get_active_hooks();
}
/* start calling a hook chain */
DECL_HANDLER(start_hook_chain)
{
struct hook *hook;
struct hook_table *table = get_queue_hooks( current );
struct hook_table *global_table = get_global_hooks( current );
if (req->id < WH_MINHOOK || req->id > WH_WINEVENT)
{
set_error( STATUS_INVALID_PARAMETER );
return;
}
reply->active_hooks = get_active_hooks();
if (!table || !(hook = get_first_valid_hook( table, req->id - WH_MINHOOK, req->event,
req->window, req->object_id, req->child_id )))
{
/* try global table */
if (!global_table || !(hook = get_first_valid_hook( global_table, req->id - WH_MINHOOK, req->event,
req->window, req->object_id, req->child_id )))
return; /* no hook set */
}
if (run_hook_in_owner_thread( hook ))
{
reply->pid = get_process_id( hook->owner->process );
reply->tid = get_thread_id( hook->owner );
}
else
{
reply->pid = 0;
reply->tid = 0;
}
reply->proc = hook->proc;
reply->handle = hook->handle;
reply->unicode = hook->unicode;
if (table) table->counts[hook->index]++;
if (global_table) global_table->counts[hook->index]++;
if (hook->module) set_reply_data( hook->module, hook->module_size );
}
/* finished calling a hook chain */
DECL_HANDLER(finish_hook_chain)
{
struct hook_table *table = get_queue_hooks( current );
struct hook_table *global_hooks = get_global_hooks( current );
int index = req->id - WH_MINHOOK;
if (req->id < WH_MINHOOK || req->id > WH_WINEVENT)
{
set_error( STATUS_INVALID_PARAMETER );
return;
}
if (table) release_hook_chain( table, index );
if (global_hooks) release_hook_chain( global_hooks, index );
}
/* get the hook information */
DECL_HANDLER(get_hook_info)
{
struct hook *hook;
if (!(hook = get_user_object( req->handle, USER_HOOK ))) return;
if (hook->thread && (hook->thread != current))
{
set_error( STATUS_INVALID_HANDLE );
return;
}
if (req->get_next && !(hook = get_next_hook( current, hook, req->event, req->window,
req->object_id, req->child_id )))
return;
reply->handle = hook->handle;
reply->id = hook->index + WH_MINHOOK;
reply->unicode = hook->unicode;
if (hook->module) set_reply_data( hook->module, min(hook->module_size,get_reply_max_size()) );
if (run_hook_in_owner_thread( hook ))
{
reply->pid = get_process_id( hook->owner->process );
reply->tid = get_thread_id( hook->owner );
}
else
{
reply->pid = 0;
reply->tid = 0;
}
reply->proc = hook->proc;
}
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