2 * Server-side window hooks support
4 * Copyright (C) 2002 Alexandre Julliard
5 * Copyright (C) 2005 Dmitry Timoshkov
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
23 #include "wine/port.h"
30 #define WIN32_NO_STATUS
45 struct list chain; /* hook chain entry */
46 user_handle_t handle; /* user handle for this hook */
47 struct process *process; /* process the hook is set to */
48 struct thread *thread; /* thread the hook is set to */
49 struct thread *owner; /* owner of the out of context hook */
50 struct hook_table *table; /* hook table that contains this hook */
51 int index; /* hook table index */
55 void *proc; /* hook function */
56 int unicode; /* is it a unicode hook? */
57 WCHAR *module; /* module name for global hooks */
58 data_size_t module_size;
61 #define WH_WINEVENT (WH_MAXHOOK+1)
63 #define NB_HOOKS (WH_WINEVENT-WH_MINHOOK+1)
64 #define HOOK_ENTRY(p) LIST_ENTRY( (p), struct hook, chain )
68 struct object obj; /* object header */
69 struct list hooks[NB_HOOKS]; /* array of hook chains */
70 int counts[NB_HOOKS]; /* use counts for each hook chain */
73 static void hook_table_dump( struct object *obj, int verbose );
74 static void hook_table_destroy( struct object *obj );
76 static const struct object_ops hook_table_ops =
78 sizeof(struct hook_table), /* size */
79 hook_table_dump, /* dump */
80 no_add_queue, /* add_queue */
81 NULL, /* remove_queue */
84 no_signal, /* signal */
85 no_get_fd, /* get_fd */
86 no_map_access, /* map_access */
87 no_lookup_name, /* lookup_name */
88 no_open_file, /* open_file */
89 no_close_handle, /* close_handle */
90 hook_table_destroy /* destroy */
94 /* create a new hook table */
95 static struct hook_table *alloc_hook_table(void)
97 struct hook_table *table;
100 if ((table = alloc_object( &hook_table_ops )))
102 for (i = 0; i < NB_HOOKS; i++)
104 list_init( &table->hooks[i] );
105 table->counts[i] = 0;
111 static struct hook_table *get_global_hooks( struct thread *thread )
113 struct hook_table *table;
114 struct desktop *desktop = get_thread_desktop( thread, 0 );
116 if (!desktop) return NULL;
117 table = desktop->global_hooks;
118 release_object( desktop );
122 /* create a new hook and add it to the specified table */
123 static struct hook *add_hook( struct desktop *desktop, struct thread *thread, int index, int global )
126 struct hook_table *table = global ? desktop->global_hooks : get_queue_hooks(thread);
130 if (!(table = alloc_hook_table())) return NULL;
131 if (global) desktop->global_hooks = table;
132 else set_queue_hooks( thread, table );
134 if (!(hook = mem_alloc( sizeof(*hook) ))) return NULL;
136 if (!(hook->handle = alloc_user_handle( hook, USER_HOOK )))
141 hook->thread = thread ? (struct thread *)grab_object( thread ) : NULL;
144 list_add_head( &table->hooks[index], &hook->chain );
145 if (thread) thread->desktop_users++;
149 /* free a hook, removing it from its chain */
150 static void free_hook( struct hook *hook )
152 free_user_handle( hook->handle );
153 free( hook->module );
156 assert( hook->thread->desktop_users > 0 );
157 hook->thread->desktop_users--;
158 release_object( hook->thread );
160 if (hook->process) release_object( hook->process );
161 release_object( hook->owner );
162 list_remove( &hook->chain );
166 /* find a hook from its index and proc */
167 static struct hook *find_hook( struct thread *thread, int index, void *proc )
170 struct hook_table *table = get_queue_hooks( thread );
174 LIST_FOR_EACH( p, &table->hooks[index] )
176 struct hook *hook = HOOK_ENTRY( p );
177 if (hook->proc == proc) return hook;
183 /* get the first hook in the chain */
184 static inline struct hook *get_first_hook( struct hook_table *table, int index )
186 struct list *elem = list_head( &table->hooks[index] );
187 return elem ? HOOK_ENTRY( elem ) : NULL;
190 /* check if a given hook should run in the current thread */
191 static inline int run_hook_in_current_thread( struct hook *hook )
193 if ((!hook->process || hook->process == current->process) &&
194 (!(hook->flags & WINEVENT_SKIPOWNPROCESS) || hook->process != current->process))
196 if ((!hook->thread || hook->thread == current) &&
197 (!(hook->flags & WINEVENT_SKIPOWNTHREAD) || hook->thread != current))
203 /* check if a given hook should run in the owner thread instead of the current thread */
204 static inline int run_hook_in_owner_thread( struct hook *hook )
206 if ((hook->index == WH_MOUSE_LL - WH_MINHOOK ||
207 hook->index == WH_KEYBOARD_LL - WH_MINHOOK))
208 return hook->owner != current;
212 /* find the first non-deleted hook in the chain */
213 static inline struct hook *get_first_valid_hook( struct hook_table *table, int index,
214 int event, user_handle_t win,
215 int object_id, int child_id )
217 struct hook *hook = get_first_hook( table, index );
221 if (hook->proc && run_hook_in_current_thread( hook ))
223 if (event >= hook->event_min && event <= hook->event_max)
225 if (hook->flags & WINEVENT_INCONTEXT) return hook;
227 /* only winevent hooks may be out of context */
228 assert(hook->index + WH_MINHOOK == WH_WINEVENT);
229 post_win_event( hook->owner, event, win, object_id, child_id,
230 hook->proc, hook->module, hook->module_size,
234 hook = HOOK_ENTRY( list_next( &table->hooks[index], &hook->chain ) );
239 /* find the next hook in the chain, skipping the deleted ones */
240 static struct hook *get_next_hook( struct thread *thread, struct hook *hook, int event,
241 user_handle_t win, int object_id, int child_id )
243 struct hook_table *global_hooks, *table = hook->table;
244 int index = hook->index;
246 while ((hook = HOOK_ENTRY( list_next( &table->hooks[index], &hook->chain ) )))
248 if (hook->proc && run_hook_in_current_thread( hook ))
250 if (event >= hook->event_min && event <= hook->event_max)
252 if (hook->flags & WINEVENT_INCONTEXT) return hook;
254 /* only winevent hooks may be out of context */
255 assert(hook->index + WH_MINHOOK == WH_WINEVENT);
256 post_win_event( hook->owner, event, win, object_id, child_id,
257 hook->proc, hook->module, hook->module_size,
262 global_hooks = get_global_hooks( thread );
263 if (global_hooks && table != global_hooks) /* now search through the global table */
265 hook = get_first_valid_hook( global_hooks, index, event, win, object_id, child_id );
270 static void hook_table_dump( struct object *obj, int verbose )
272 /* struct hook_table *table = (struct hook_table *)obj; */
273 fprintf( stderr, "Hook table\n" );
276 static void hook_table_destroy( struct object *obj )
280 struct hook_table *table = (struct hook_table *)obj;
282 for (i = 0; i < NB_HOOKS; i++)
284 while ((hook = get_first_hook( table, i )) != NULL) free_hook( hook );
288 /* remove a hook, freeing it if the chain is not in use */
289 static void remove_hook( struct hook *hook )
291 if (hook->table->counts[hook->index])
292 hook->proc = NULL; /* chain is in use, just mark it and return */
297 /* release a hook chain, removing deleted hooks if the use count drops to 0 */
298 static void release_hook_chain( struct hook_table *table, int index )
300 if (!table->counts[index]) /* use count shouldn't already be 0 */
302 set_error( STATUS_INVALID_PARAMETER );
305 if (!--table->counts[index])
307 struct hook *hook = get_first_hook( table, index );
310 struct hook *next = HOOK_ENTRY( list_next( &table->hooks[hook->index], &hook->chain ) );
311 if (!hook->proc) free_hook( hook );
317 /* remove all global hooks owned by a given thread */
318 void remove_thread_hooks( struct thread *thread )
320 struct hook_table *global_hooks = get_global_hooks( thread );
323 if (!global_hooks) return;
325 /* only low-level keyboard/mouse global hooks can be owned by a thread */
326 for (index = WH_KEYBOARD_LL - WH_MINHOOK; index <= WH_MOUSE_LL - WH_MINHOOK; index++)
328 struct hook *hook = get_first_hook( global_hooks, index );
331 struct hook *next = HOOK_ENTRY( list_next( &global_hooks->hooks[index], &hook->chain ) );
332 if (hook->thread == thread) remove_hook( hook );
338 /* get a bitmap of active hooks in a hook table */
339 static int is_hook_active( struct hook_table *table, int index )
341 struct hook *hook = get_first_hook( table, index );
345 if (hook->proc && run_hook_in_current_thread( hook )) return 1;
346 hook = HOOK_ENTRY( list_next( &table->hooks[index], &hook->chain ) );
351 /* get a bitmap of all active hooks for the current thread */
352 unsigned int get_active_hooks(void)
354 struct hook_table *table = get_queue_hooks( current );
355 struct hook_table *global_hooks = get_global_hooks( current );
356 unsigned int ret = 1 << 31; /* set high bit to indicate that the bitmap is valid */
359 for (id = WH_MINHOOK; id <= WH_WINEVENT; id++)
361 if ((table && is_hook_active( table, id - WH_MINHOOK )) ||
362 (global_hooks && is_hook_active( global_hooks, id - WH_MINHOOK )))
363 ret |= 1 << (id - WH_MINHOOK);
368 /* set a window hook */
369 DECL_HANDLER(set_hook)
371 struct process *process = NULL;
372 struct thread *thread = NULL;
373 struct desktop *desktop;
377 data_size_t module_size = get_req_data_size();
379 if (!req->proc || req->id < WH_MINHOOK || req->id > WH_WINEVENT)
381 set_error( STATUS_INVALID_PARAMETER );
385 if (!(desktop = get_thread_desktop( current, DESKTOP_HOOKCONTROL ))) return;
387 if (req->pid && !(process = get_process_from_id( req->pid ))) goto done;
391 if (!(thread = get_thread_from_id( req->tid ))) goto done;
392 if (process && process != thread->process)
394 set_error( STATUS_INVALID_PARAMETER );
399 if (req->id == WH_KEYBOARD_LL || req->id == WH_MOUSE_LL)
401 /* low-level hardware hooks are special: always global, but without a module */
404 set_error( STATUS_INVALID_PARAMETER );
412 /* out of context hooks do not need a module handle */
413 if (!module_size && (req->flags & WINEVENT_INCONTEXT))
415 set_error( STATUS_INVALID_PARAMETER );
418 if (!(module = memdup( get_req_data(), module_size ))) goto done;
423 /* module is optional only if hook is in current process */
427 if (thread->process != current->process)
429 set_error( STATUS_INVALID_PARAMETER );
433 else if (!(module = memdup( get_req_data(), module_size ))) goto done;
437 if ((hook = add_hook( desktop, thread, req->id - WH_MINHOOK, global )))
439 hook->owner = (struct thread *)grab_object( current );
440 hook->process = process ? (struct process *)grab_object( process ) : NULL;
441 hook->event_min = req->event_min;
442 hook->event_max = req->event_max;
443 hook->flags = req->flags;
444 hook->proc = req->proc;
445 hook->unicode = req->unicode;
446 hook->module = module;
447 hook->module_size = module_size;
448 reply->handle = hook->handle;
449 reply->active_hooks = get_active_hooks();
454 if (process) release_object( process );
455 if (thread) release_object( thread );
456 release_object( desktop );
460 /* remove a window hook */
461 DECL_HANDLER(remove_hook)
467 if (!(hook = get_user_object( req->handle, USER_HOOK )))
469 set_error( STATUS_INVALID_HANDLE );
475 if (!req->proc || req->id < WH_MINHOOK || req->id > WH_WINEVENT)
477 set_error( STATUS_INVALID_PARAMETER );
480 if (!(hook = find_hook( current, req->id - WH_MINHOOK, req->proc )))
482 set_error( STATUS_INVALID_PARAMETER );
487 reply->active_hooks = get_active_hooks();
491 /* start calling a hook chain */
492 DECL_HANDLER(start_hook_chain)
495 struct hook_table *table = get_queue_hooks( current );
497 if (req->id < WH_MINHOOK || req->id > WH_WINEVENT)
499 set_error( STATUS_INVALID_PARAMETER );
503 reply->active_hooks = get_active_hooks();
505 if (!table || !(hook = get_first_valid_hook( table, req->id - WH_MINHOOK, req->event,
506 req->window, req->object_id, req->child_id )))
508 /* try global table */
509 if (!(table = get_global_hooks( current )) ||
510 !(hook = get_first_valid_hook( table, req->id - WH_MINHOOK, req->event,
511 req->window, req->object_id, req->child_id )))
512 return; /* no hook set */
515 if (run_hook_in_owner_thread( hook ))
517 reply->pid = get_process_id( hook->owner->process );
518 reply->tid = get_thread_id( hook->owner );
525 reply->proc = hook->proc;
526 reply->handle = hook->handle;
527 reply->unicode = hook->unicode;
528 table->counts[hook->index]++;
529 if (hook->module) set_reply_data( hook->module, hook->module_size );
533 /* finished calling a hook chain */
534 DECL_HANDLER(finish_hook_chain)
536 struct hook_table *table = get_queue_hooks( current );
537 struct hook_table *global_hooks = get_global_hooks( current );
538 int index = req->id - WH_MINHOOK;
540 if (req->id < WH_MINHOOK || req->id > WH_WINEVENT)
542 set_error( STATUS_INVALID_PARAMETER );
545 if (table) release_hook_chain( table, index );
546 if (global_hooks) release_hook_chain( global_hooks, index );
550 /* get the hook information */
551 DECL_HANDLER(get_hook_info)
555 if (!(hook = get_user_object( req->handle, USER_HOOK ))) return;
556 if (hook->thread && (hook->thread != current))
558 set_error( STATUS_INVALID_HANDLE );
561 if (req->get_next && !(hook = get_next_hook( current, hook, req->event, req->window,
562 req->object_id, req->child_id )))
565 reply->handle = hook->handle;
566 reply->id = hook->index + WH_MINHOOK;
567 reply->unicode = hook->unicode;
568 if (hook->module) set_reply_data( hook->module, min(hook->module_size,get_reply_max_size()) );
569 if (run_hook_in_owner_thread( hook ))
571 reply->pid = get_process_id( hook->owner->process );
572 reply->tid = get_thread_id( hook->owner );
579 reply->proc = hook->proc;