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 default_get_sd, /* get_sd */
88 default_set_sd, /* set_sd */
89 no_lookup_name, /* lookup_name */
90 no_open_file, /* open_file */
91 no_close_handle, /* close_handle */
92 hook_table_destroy /* destroy */
96 /* create a new hook table */
97 static struct hook_table *alloc_hook_table(void)
99 struct hook_table *table;
102 if ((table = alloc_object( &hook_table_ops )))
104 for (i = 0; i < NB_HOOKS; i++)
106 list_init( &table->hooks[i] );
107 table->counts[i] = 0;
113 static struct hook_table *get_global_hooks( struct thread *thread )
115 struct hook_table *table;
116 struct desktop *desktop = get_thread_desktop( thread, 0 );
118 if (!desktop) return NULL;
119 table = desktop->global_hooks;
120 release_object( desktop );
124 /* create a new hook and add it to the specified table */
125 static struct hook *add_hook( struct desktop *desktop, struct thread *thread, int index, int global )
128 struct hook_table *table = global ? desktop->global_hooks : get_queue_hooks(thread);
132 if (!(table = alloc_hook_table())) return NULL;
133 if (global) desktop->global_hooks = table;
134 else set_queue_hooks( thread, table );
136 if (!(hook = mem_alloc( sizeof(*hook) ))) return NULL;
138 if (!(hook->handle = alloc_user_handle( hook, USER_HOOK )))
143 hook->thread = thread ? (struct thread *)grab_object( thread ) : NULL;
146 list_add_head( &table->hooks[index], &hook->chain );
147 if (thread) thread->desktop_users++;
151 /* free a hook, removing it from its chain */
152 static void free_hook( struct hook *hook )
154 free_user_handle( hook->handle );
155 free( hook->module );
158 assert( hook->thread->desktop_users > 0 );
159 hook->thread->desktop_users--;
160 release_object( hook->thread );
162 if (hook->process) release_object( hook->process );
163 release_object( hook->owner );
164 list_remove( &hook->chain );
168 /* find a hook from its index and proc */
169 static struct hook *find_hook( struct thread *thread, int index, void *proc )
172 struct hook_table *table = get_queue_hooks( thread );
176 LIST_FOR_EACH( p, &table->hooks[index] )
178 struct hook *hook = HOOK_ENTRY( p );
179 if (hook->proc == proc) return hook;
185 /* get the first hook in the chain */
186 static inline struct hook *get_first_hook( struct hook_table *table, int index )
188 struct list *elem = list_head( &table->hooks[index] );
189 return elem ? HOOK_ENTRY( elem ) : NULL;
192 /* check if a given hook should run in the current thread */
193 static inline int run_hook_in_current_thread( struct hook *hook )
195 if ((!hook->process || hook->process == current->process) &&
196 (!(hook->flags & WINEVENT_SKIPOWNPROCESS) || hook->process != current->process))
198 if ((!hook->thread || hook->thread == current) &&
199 (!(hook->flags & WINEVENT_SKIPOWNTHREAD) || hook->thread != current))
205 /* check if a given hook should run in the owner thread instead of the current thread */
206 static inline int run_hook_in_owner_thread( struct hook *hook )
208 if ((hook->index == WH_MOUSE_LL - WH_MINHOOK ||
209 hook->index == WH_KEYBOARD_LL - WH_MINHOOK))
210 return hook->owner != current;
214 /* find the first non-deleted hook in the chain */
215 static inline struct hook *get_first_valid_hook( struct hook_table *table, int index,
216 int event, user_handle_t win,
217 int object_id, int child_id )
219 struct hook *hook = get_first_hook( table, index );
223 if (hook->proc && run_hook_in_current_thread( hook ))
225 if (event >= hook->event_min && event <= hook->event_max)
227 if (hook->flags & WINEVENT_INCONTEXT) return hook;
229 /* only winevent hooks may be out of context */
230 assert(hook->index + WH_MINHOOK == WH_WINEVENT);
231 post_win_event( hook->owner, event, win, object_id, child_id,
232 hook->proc, hook->module, hook->module_size,
236 hook = HOOK_ENTRY( list_next( &table->hooks[index], &hook->chain ) );
241 /* find the next hook in the chain, skipping the deleted ones */
242 static struct hook *get_next_hook( struct thread *thread, struct hook *hook, int event,
243 user_handle_t win, int object_id, int child_id )
245 struct hook_table *global_hooks, *table = hook->table;
246 int index = hook->index;
248 while ((hook = HOOK_ENTRY( list_next( &table->hooks[index], &hook->chain ) )))
250 if (hook->proc && run_hook_in_current_thread( hook ))
252 if (event >= hook->event_min && event <= hook->event_max)
254 if (hook->flags & WINEVENT_INCONTEXT) return hook;
256 /* only winevent hooks may be out of context */
257 assert(hook->index + WH_MINHOOK == WH_WINEVENT);
258 post_win_event( hook->owner, event, win, object_id, child_id,
259 hook->proc, hook->module, hook->module_size,
264 global_hooks = get_global_hooks( thread );
265 if (global_hooks && table != global_hooks) /* now search through the global table */
267 hook = get_first_valid_hook( global_hooks, index, event, win, object_id, child_id );
272 static void hook_table_dump( struct object *obj, int verbose )
274 /* struct hook_table *table = (struct hook_table *)obj; */
275 fprintf( stderr, "Hook table\n" );
278 static void hook_table_destroy( struct object *obj )
282 struct hook_table *table = (struct hook_table *)obj;
284 for (i = 0; i < NB_HOOKS; i++)
286 while ((hook = get_first_hook( table, i )) != NULL) free_hook( hook );
290 /* remove a hook, freeing it if the chain is not in use */
291 static void remove_hook( struct hook *hook )
293 if (hook->table->counts[hook->index])
294 hook->proc = NULL; /* chain is in use, just mark it and return */
299 /* release a hook chain, removing deleted hooks if the use count drops to 0 */
300 static void release_hook_chain( struct hook_table *table, int index )
302 if (!table->counts[index]) /* use count shouldn't already be 0 */
304 set_error( STATUS_INVALID_PARAMETER );
307 if (!--table->counts[index])
309 struct hook *hook = get_first_hook( table, index );
312 struct hook *next = HOOK_ENTRY( list_next( &table->hooks[hook->index], &hook->chain ) );
313 if (!hook->proc) free_hook( hook );
319 /* remove all global hooks owned by a given thread */
320 void remove_thread_hooks( struct thread *thread )
322 struct hook_table *global_hooks = get_global_hooks( thread );
325 if (!global_hooks) return;
327 /* only low-level keyboard/mouse global hooks can be owned by a thread */
328 for (index = WH_KEYBOARD_LL - WH_MINHOOK; index <= WH_MOUSE_LL - WH_MINHOOK; index++)
330 struct hook *hook = get_first_hook( global_hooks, index );
333 struct hook *next = HOOK_ENTRY( list_next( &global_hooks->hooks[index], &hook->chain ) );
334 if (hook->thread == thread) remove_hook( hook );
340 /* get a bitmap of active hooks in a hook table */
341 static int is_hook_active( struct hook_table *table, int index )
343 struct hook *hook = get_first_hook( table, index );
347 if (hook->proc && run_hook_in_current_thread( hook )) return 1;
348 hook = HOOK_ENTRY( list_next( &table->hooks[index], &hook->chain ) );
353 /* get a bitmap of all active hooks for the current thread */
354 unsigned int get_active_hooks(void)
356 struct hook_table *table = get_queue_hooks( current );
357 struct hook_table *global_hooks = get_global_hooks( current );
358 unsigned int ret = 1 << 31; /* set high bit to indicate that the bitmap is valid */
361 for (id = WH_MINHOOK; id <= WH_WINEVENT; id++)
363 if ((table && is_hook_active( table, id - WH_MINHOOK )) ||
364 (global_hooks && is_hook_active( global_hooks, id - WH_MINHOOK )))
365 ret |= 1 << (id - WH_MINHOOK);
370 /* set a window hook */
371 DECL_HANDLER(set_hook)
373 struct process *process = NULL;
374 struct thread *thread = NULL;
375 struct desktop *desktop;
379 data_size_t module_size = get_req_data_size();
381 if (!req->proc || req->id < WH_MINHOOK || req->id > WH_WINEVENT)
383 set_error( STATUS_INVALID_PARAMETER );
387 if (!(desktop = get_thread_desktop( current, DESKTOP_HOOKCONTROL ))) return;
389 if (req->pid && !(process = get_process_from_id( req->pid ))) goto done;
393 if (!(thread = get_thread_from_id( req->tid ))) goto done;
394 if (process && process != thread->process)
396 set_error( STATUS_INVALID_PARAMETER );
401 if (req->id == WH_KEYBOARD_LL || req->id == WH_MOUSE_LL)
403 /* low-level hardware hooks are special: always global, but without a module */
406 set_error( STATUS_INVALID_PARAMETER );
414 /* out of context hooks do not need a module handle */
415 if (!module_size && (req->flags & WINEVENT_INCONTEXT))
417 set_error( STATUS_INVALID_PARAMETER );
420 if (!(module = memdup( get_req_data(), module_size ))) goto done;
425 /* module is optional only if hook is in current process */
429 if (thread->process != current->process)
431 set_error( STATUS_INVALID_PARAMETER );
435 else if (!(module = memdup( get_req_data(), module_size ))) goto done;
439 if ((hook = add_hook( desktop, thread, req->id - WH_MINHOOK, global )))
441 hook->owner = (struct thread *)grab_object( current );
442 hook->process = process ? (struct process *)grab_object( process ) : NULL;
443 hook->event_min = req->event_min;
444 hook->event_max = req->event_max;
445 hook->flags = req->flags;
446 hook->proc = req->proc;
447 hook->unicode = req->unicode;
448 hook->module = module;
449 hook->module_size = module_size;
450 reply->handle = hook->handle;
451 reply->active_hooks = get_active_hooks();
456 if (process) release_object( process );
457 if (thread) release_object( thread );
458 release_object( desktop );
462 /* remove a window hook */
463 DECL_HANDLER(remove_hook)
469 if (!(hook = get_user_object( req->handle, USER_HOOK )))
471 set_error( STATUS_INVALID_HANDLE );
477 if (!req->proc || req->id < WH_MINHOOK || req->id > WH_WINEVENT)
479 set_error( STATUS_INVALID_PARAMETER );
482 if (!(hook = find_hook( current, req->id - WH_MINHOOK, req->proc )))
484 set_error( STATUS_INVALID_PARAMETER );
489 reply->active_hooks = get_active_hooks();
493 /* start calling a hook chain */
494 DECL_HANDLER(start_hook_chain)
497 struct hook_table *table = get_queue_hooks( current );
499 if (req->id < WH_MINHOOK || req->id > WH_WINEVENT)
501 set_error( STATUS_INVALID_PARAMETER );
505 reply->active_hooks = get_active_hooks();
507 if (!table || !(hook = get_first_valid_hook( table, req->id - WH_MINHOOK, req->event,
508 req->window, req->object_id, req->child_id )))
510 /* try global table */
511 if (!(table = get_global_hooks( current )) ||
512 !(hook = get_first_valid_hook( table, req->id - WH_MINHOOK, req->event,
513 req->window, req->object_id, req->child_id )))
514 return; /* no hook set */
517 if (run_hook_in_owner_thread( hook ))
519 reply->pid = get_process_id( hook->owner->process );
520 reply->tid = get_thread_id( hook->owner );
527 reply->proc = hook->proc;
528 reply->handle = hook->handle;
529 reply->unicode = hook->unicode;
530 table->counts[hook->index]++;
531 if (hook->module) set_reply_data( hook->module, hook->module_size );
535 /* finished calling a hook chain */
536 DECL_HANDLER(finish_hook_chain)
538 struct hook_table *table = get_queue_hooks( current );
539 struct hook_table *global_hooks = get_global_hooks( current );
540 int index = req->id - WH_MINHOOK;
542 if (req->id < WH_MINHOOK || req->id > WH_WINEVENT)
544 set_error( STATUS_INVALID_PARAMETER );
547 if (table) release_hook_chain( table, index );
548 if (global_hooks) release_hook_chain( global_hooks, index );
552 /* get the hook information */
553 DECL_HANDLER(get_hook_info)
557 if (!(hook = get_user_object( req->handle, USER_HOOK ))) return;
558 if (hook->thread && (hook->thread != current))
560 set_error( STATUS_INVALID_HANDLE );
563 if (req->get_next && !(hook = get_next_hook( current, hook, req->event, req->window,
564 req->object_id, req->child_id )))
567 reply->handle = hook->handle;
568 reply->id = hook->index + WH_MINHOOK;
569 reply->unicode = hook->unicode;
570 if (hook->module) set_reply_data( hook->module, min(hook->module_size,get_reply_max_size()) );
571 if (run_hook_in_owner_thread( hook ))
573 reply->pid = get_process_id( hook->owner->process );
574 reply->tid = get_thread_id( hook->owner );
581 reply->proc = hook->proc;