599 lines
18 KiB
C
599 lines
18 KiB
C
/*
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* Server-side window hooks support
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*
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* Copyright (C) 2002 Alexandre Julliard
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* Copyright (C) 2005 Dmitry Timoshkov
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include "config.h"
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#include <assert.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include "ntstatus.h"
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#define WIN32_NO_STATUS
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#include "windef.h"
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#include "winbase.h"
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#include "winuser.h"
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#include "winternl.h"
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#include "object.h"
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#include "process.h"
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#include "request.h"
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#include "user.h"
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struct hook_table;
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struct hook
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{
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struct list chain; /* hook chain entry */
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user_handle_t handle; /* user handle for this hook */
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struct process *process; /* process the hook is set to */
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struct thread *thread; /* thread the hook is set to */
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struct thread *owner; /* owner of the out of context hook */
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struct hook_table *table; /* hook table that contains this hook */
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int index; /* hook table index */
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int event_min;
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int event_max;
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int flags;
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client_ptr_t proc; /* hook function */
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int unicode; /* is it a unicode hook? */
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WCHAR *module; /* module name for global hooks */
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data_size_t module_size;
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};
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#define WH_WINEVENT (WH_MAXHOOK+1)
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#define NB_HOOKS (WH_WINEVENT-WH_MINHOOK+1)
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#define HOOK_ENTRY(p) LIST_ENTRY( (p), struct hook, chain )
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struct hook_table
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{
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struct object obj; /* object header */
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struct list hooks[NB_HOOKS]; /* array of hook chains */
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int counts[NB_HOOKS]; /* use counts for each hook chain */
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};
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static void hook_table_dump( struct object *obj, int verbose );
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static void hook_table_destroy( struct object *obj );
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static const struct object_ops hook_table_ops =
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{
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sizeof(struct hook_table), /* size */
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&no_type, /* type */
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hook_table_dump, /* dump */
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no_add_queue, /* add_queue */
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NULL, /* remove_queue */
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NULL, /* signaled */
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NULL, /* satisfied */
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no_signal, /* signal */
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no_get_fd, /* get_fd */
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default_map_access, /* map_access */
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default_get_sd, /* get_sd */
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default_set_sd, /* set_sd */
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no_get_full_name, /* get_full_name */
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no_lookup_name, /* lookup_name */
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no_link_name, /* link_name */
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NULL, /* unlink_name */
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no_open_file, /* open_file */
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no_kernel_obj_list, /* get_kernel_obj_list */
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no_close_handle, /* close_handle */
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hook_table_destroy /* destroy */
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};
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/* create a new hook table */
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static struct hook_table *alloc_hook_table(void)
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{
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struct hook_table *table;
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int i;
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if ((table = alloc_object( &hook_table_ops )))
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{
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for (i = 0; i < NB_HOOKS; i++)
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{
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list_init( &table->hooks[i] );
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table->counts[i] = 0;
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}
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}
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return table;
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}
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static struct hook_table *get_global_hooks( struct thread *thread )
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{
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struct hook_table *table;
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struct desktop *desktop;
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if (!thread->desktop) return NULL;
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if (!(desktop = get_thread_desktop( thread, 0 ))) return NULL;
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table = desktop->global_hooks;
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release_object( desktop );
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return table;
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}
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/* create a new hook and add it to the specified table */
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static struct hook *add_hook( struct desktop *desktop, struct thread *thread, int index, int global )
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{
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struct hook *hook;
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struct hook_table *table = global ? desktop->global_hooks : get_queue_hooks(thread);
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if (!table)
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{
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if (!(table = alloc_hook_table())) return NULL;
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if (global) desktop->global_hooks = table;
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else set_queue_hooks( thread, table );
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}
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if (!(hook = mem_alloc( sizeof(*hook) ))) return NULL;
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if (!(hook->handle = alloc_user_handle( hook, USER_HOOK )))
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{
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free( hook );
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return NULL;
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}
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hook->thread = thread ? (struct thread *)grab_object( thread ) : NULL;
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hook->table = table;
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hook->index = index;
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list_add_head( &table->hooks[index], &hook->chain );
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if (thread) thread->desktop_users++;
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return hook;
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}
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/* free a hook, removing it from its chain */
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static void free_hook( struct hook *hook )
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{
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free_user_handle( hook->handle );
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free( hook->module );
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if (hook->thread)
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{
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assert( hook->thread->desktop_users > 0 );
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hook->thread->desktop_users--;
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release_object( hook->thread );
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}
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if (hook->process) release_object( hook->process );
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release_object( hook->owner );
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list_remove( &hook->chain );
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free( hook );
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}
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/* find a hook from its index and proc */
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static struct hook *find_hook( struct thread *thread, int index, client_ptr_t proc )
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{
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struct list *p;
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struct hook_table *table = get_queue_hooks( thread );
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if (table)
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{
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LIST_FOR_EACH( p, &table->hooks[index] )
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{
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struct hook *hook = HOOK_ENTRY( p );
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if (hook->proc == proc) return hook;
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}
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}
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return NULL;
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}
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/* get the first hook in the chain */
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static inline struct hook *get_first_hook( struct hook_table *table, int index )
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{
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struct list *elem = list_head( &table->hooks[index] );
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return elem ? HOOK_ENTRY( elem ) : NULL;
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}
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/* check if a given hook should run in the owner thread instead of the current thread */
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static inline int run_hook_in_owner_thread( struct hook *hook )
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{
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if ((hook->index == WH_MOUSE_LL - WH_MINHOOK ||
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hook->index == WH_KEYBOARD_LL - WH_MINHOOK))
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return hook->owner != current;
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return 0;
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}
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/* check if a given hook should run in the current thread */
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static inline int run_hook_in_current_thread( struct hook *hook )
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{
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if (hook->process && hook->process != current->process) return 0;
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if ((hook->flags & WINEVENT_SKIPOWNPROCESS) && hook->process == current->process) return 0;
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if (hook->thread && hook->thread != current) return 0;
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if ((hook->flags & WINEVENT_SKIPOWNTHREAD) && hook->thread == current) return 0;
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/* don't run low-level hooks in processes suspended for debugging */
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if (run_hook_in_owner_thread( hook ) && hook->owner->process->suspend) return 0;
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return 1;
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}
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/* find the first non-deleted hook in the chain */
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static inline struct hook *get_first_valid_hook( struct hook_table *table, int index,
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int event, user_handle_t win,
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int object_id, int child_id )
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{
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struct hook *hook = get_first_hook( table, index );
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while (hook)
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{
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if (hook->proc && run_hook_in_current_thread( hook ))
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{
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if (event >= hook->event_min && event <= hook->event_max)
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{
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if (hook->flags & WINEVENT_INCONTEXT) return hook;
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/* only winevent hooks may be out of context */
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assert(hook->index + WH_MINHOOK == WH_WINEVENT);
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post_win_event( hook->owner, event, win, object_id, child_id,
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hook->proc, hook->module, hook->module_size,
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hook->handle );
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}
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}
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hook = HOOK_ENTRY( list_next( &table->hooks[index], &hook->chain ) );
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}
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return hook;
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}
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/* find the next hook in the chain, skipping the deleted ones */
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static struct hook *get_next_hook( struct thread *thread, struct hook *hook, int event,
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user_handle_t win, int object_id, int child_id )
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{
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struct hook_table *global_hooks, *table = hook->table;
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int index = hook->index;
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while ((hook = HOOK_ENTRY( list_next( &table->hooks[index], &hook->chain ) )))
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{
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if (hook->proc && run_hook_in_current_thread( hook ))
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{
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if (event >= hook->event_min && event <= hook->event_max)
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{
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if (hook->flags & WINEVENT_INCONTEXT) return hook;
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/* only winevent hooks may be out of context */
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assert(hook->index + WH_MINHOOK == WH_WINEVENT);
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post_win_event( hook->owner, event, win, object_id, child_id,
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hook->proc, hook->module, hook->module_size,
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hook->handle );
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}
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}
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}
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global_hooks = get_global_hooks( thread );
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if (global_hooks && table != global_hooks) /* now search through the global table */
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{
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hook = get_first_valid_hook( global_hooks, index, event, win, object_id, child_id );
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}
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return hook;
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}
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static void hook_table_dump( struct object *obj, int verbose )
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{
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/* struct hook_table *table = (struct hook_table *)obj; */
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fprintf( stderr, "Hook table\n" );
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}
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static void hook_table_destroy( struct object *obj )
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{
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int i;
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struct hook *hook;
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struct hook_table *table = (struct hook_table *)obj;
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for (i = 0; i < NB_HOOKS; i++)
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{
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while ((hook = get_first_hook( table, i )) != NULL) free_hook( hook );
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}
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}
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/* remove a hook, freeing it if the chain is not in use */
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static void remove_hook( struct hook *hook )
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{
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if (hook->table->counts[hook->index])
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hook->proc = 0; /* chain is in use, just mark it and return */
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else
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free_hook( hook );
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}
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/* release a hook chain, removing deleted hooks if the use count drops to 0 */
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static void release_hook_chain( struct hook_table *table, int index )
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{
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if (!table->counts[index]) /* use count shouldn't already be 0 */
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{
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set_error( STATUS_INVALID_PARAMETER );
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return;
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}
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if (!--table->counts[index])
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{
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struct hook *hook = get_first_hook( table, index );
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while (hook)
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{
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struct hook *next = HOOK_ENTRY( list_next( &table->hooks[hook->index], &hook->chain ) );
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if (!hook->proc) free_hook( hook );
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hook = next;
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}
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}
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}
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/* remove all global hooks owned by a given thread */
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void remove_thread_hooks( struct thread *thread )
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{
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struct hook_table *global_hooks = get_global_hooks( thread );
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int index;
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if (!global_hooks) return;
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/* only low-level keyboard/mouse global hooks can be owned by a thread */
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for (index = WH_KEYBOARD_LL - WH_MINHOOK; index <= WH_MOUSE_LL - WH_MINHOOK; index++)
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{
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struct hook *hook = get_first_hook( global_hooks, index );
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while (hook)
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{
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struct hook *next = HOOK_ENTRY( list_next( &global_hooks->hooks[index], &hook->chain ) );
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if (hook->thread == thread) remove_hook( hook );
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hook = next;
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}
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}
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}
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/* get a bitmap of active hooks in a hook table */
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static int is_hook_active( struct hook_table *table, int index )
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{
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struct hook *hook = get_first_hook( table, index );
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while (hook)
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{
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if (hook->proc && run_hook_in_current_thread( hook )) return 1;
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hook = HOOK_ENTRY( list_next( &table->hooks[index], &hook->chain ) );
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}
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return 0;
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}
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/* get a bitmap of all active hooks for the current thread */
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unsigned int get_active_hooks(void)
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{
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struct hook_table *table = get_queue_hooks( current );
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struct hook_table *global_hooks = get_global_hooks( current );
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unsigned int ret = 1u << 31; /* set high bit to indicate that the bitmap is valid */
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int id;
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for (id = WH_MINHOOK; id <= WH_WINEVENT; id++)
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{
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if ((table && is_hook_active( table, id - WH_MINHOOK )) ||
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(global_hooks && is_hook_active( global_hooks, id - WH_MINHOOK )))
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ret |= 1 << (id - WH_MINHOOK);
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}
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return ret;
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}
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/* return the thread that owns the first global hook */
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struct thread *get_first_global_hook( int id )
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{
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struct hook *hook;
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struct hook_table *global_hooks = get_global_hooks( current );
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if (!global_hooks) return NULL;
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if (!(hook = get_first_valid_hook( global_hooks, id - WH_MINHOOK, EVENT_MIN, 0, 0, 0 ))) return NULL;
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return hook->owner;
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}
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/* set a window hook */
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DECL_HANDLER(set_hook)
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{
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struct process *process = NULL;
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struct thread *thread = NULL;
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struct desktop *desktop;
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struct hook *hook;
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WCHAR *module;
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int global;
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data_size_t module_size = get_req_data_size();
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if (!req->proc || req->id < WH_MINHOOK || req->id > WH_WINEVENT)
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{
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set_error( STATUS_INVALID_PARAMETER );
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return;
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}
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if (!(desktop = get_thread_desktop( current, DESKTOP_HOOKCONTROL ))) return;
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if (req->pid && !(process = get_process_from_id( req->pid ))) goto done;
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if (req->tid)
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{
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if (!(thread = get_thread_from_id( req->tid ))) goto done;
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if (process && process != thread->process)
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{
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set_error( STATUS_INVALID_PARAMETER );
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goto done;
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}
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}
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if (req->id == WH_KEYBOARD_LL || req->id == WH_MOUSE_LL)
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{
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/* low-level hardware hooks are special: always global, but without a module */
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if (thread)
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{
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set_error( STATUS_INVALID_PARAMETER );
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goto done;
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}
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module = NULL;
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global = 1;
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}
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else if (!req->tid)
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{
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/* out of context hooks do not need a module handle */
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if (!module_size && (req->flags & WINEVENT_INCONTEXT))
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{
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set_error( STATUS_INVALID_PARAMETER );
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goto done;
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}
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if (!(module = memdup( get_req_data(), module_size ))) goto done;
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global = 1;
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}
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else
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{
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/* module is optional only if hook is in current process */
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if (!module_size)
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{
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module = NULL;
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if (thread->process != current->process)
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{
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set_error( STATUS_INVALID_PARAMETER );
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goto done;
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}
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}
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else if (!(module = memdup( get_req_data(), module_size ))) goto done;
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global = 0;
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}
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if ((hook = add_hook( desktop, thread, req->id - WH_MINHOOK, global )))
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{
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hook->owner = (struct thread *)grab_object( current );
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hook->process = process ? (struct process *)grab_object( process ) : NULL;
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hook->event_min = req->event_min;
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hook->event_max = req->event_max;
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hook->flags = req->flags;
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hook->proc = req->proc;
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hook->unicode = req->unicode;
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hook->module = module;
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hook->module_size = module_size;
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reply->handle = hook->handle;
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reply->active_hooks = get_active_hooks();
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}
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else free( module );
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done:
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if (process) release_object( process );
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if (thread) release_object( thread );
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release_object( desktop );
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}
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/* remove a window hook */
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DECL_HANDLER(remove_hook)
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{
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struct hook *hook;
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if (req->handle)
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{
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if (!(hook = get_user_object( req->handle, USER_HOOK )))
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{
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set_error( STATUS_INVALID_HANDLE );
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return;
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}
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}
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else
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{
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if (!req->proc || req->id < WH_MINHOOK || req->id > WH_WINEVENT)
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{
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set_error( STATUS_INVALID_PARAMETER );
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return;
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}
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if (!(hook = find_hook( current, req->id - WH_MINHOOK, req->proc )))
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{
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set_error( STATUS_INVALID_PARAMETER );
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return;
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}
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}
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remove_hook( hook );
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reply->active_hooks = get_active_hooks();
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}
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/* start calling a hook chain */
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DECL_HANDLER(start_hook_chain)
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{
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struct hook *hook;
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struct hook_table *table = get_queue_hooks( current );
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struct hook_table *global_table = get_global_hooks( current );
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if (req->id < WH_MINHOOK || req->id > WH_WINEVENT)
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{
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set_error( STATUS_INVALID_PARAMETER );
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return;
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}
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reply->active_hooks = get_active_hooks();
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|
|
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;
|
|
}
|