dlls/user32/hook.c

   1 /*
   2  * Windows hook functions
   3  *
   4  * Copyright 2002 Alexandre Julliard
   5  * Copyright 2005 Dmitry Timoshkov
   6  *
   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.
  11  *
  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.
  16  *
  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
  20  *
  21  * NOTES:
  22  *   Status of the various hooks:
  23  *     WH_MSGFILTER                 OK
  24  *     WH_JOURNALRECORD             Partially implemented
  25  *     WH_JOURNALPLAYBACK           Partially implemented
  26  *     WH_KEYBOARD                  OK
  27  *     WH_GETMESSAGE                OK (FIXME: A/W mapping?)
  28  *     WH_CALLWNDPROC               OK (FIXME: A/W mapping?)
  29  *     WH_CBT
  30  *       HCBT_MOVESIZE              OK
  31  *       HCBT_MINMAX                OK
  32  *       HCBT_QS                    OK
  33  *       HCBT_CREATEWND             OK
  34  *       HCBT_DESTROYWND            OK
  35  *       HCBT_ACTIVATE              OK
  36  *       HCBT_CLICKSKIPPED          OK
  37  *       HCBT_KEYSKIPPED            OK
  38  *       HCBT_SYSCOMMAND            OK
  39  *       HCBT_SETFOCUS              OK
  40  *     WH_SYSMSGFILTER              OK
  41  *     WH_MOUSE                     OK
  42  *     WH_HARDWARE                  Not supported in Win32
  43  *     WH_DEBUG                     Not implemented
  44  *     WH_SHELL
  45  *       HSHELL_WINDOWCREATED       OK
  46  *       HSHELL_WINDOWDESTROYED     OK
  47  *       HSHELL_ACTIVATESHELLWINDOW Not implemented
  48  *       HSHELL_WINDOWACTIVATED     Not implemented
  49  *       HSHELL_GETMINRECT          Not implemented
  50  *       HSHELL_REDRAW              Not implemented
  51  *       HSHELL_TASKMAN             Not implemented
  52  *       HSHELL_LANGUAGE            Not implemented
  53  *       HSHELL_SYSMENU             Not implemented
  54  *       HSHELL_ENDTASK             Not implemented
  55  *       HSHELL_ACCESSIBILITYSTATE  Not implemented
  56  *       HSHELL_APPCOMMAND          Not implemented
  57  *       HSHELL_WINDOWREPLACED      Not implemented
  58  *       HSHELL_WINDOWREPLACING     Not implemented
  59  *     WH_FOREGROUNDIDLE            Not implemented
  60  *     WH_CALLWNDPROCRET            OK (FIXME: A/W mapping?)
  61  *     WH_KEYBOARD_LL               Implemented but should use SendMessage instead
  62  *     WH_MOUSE_LL                  Implemented but should use SendMessage instead
  63  */
  64
  65 #include "config.h"
  66 #include "wine/port.h"
  67
  68 #include <stdarg.h>
  69 #include <assert.h>
  70
  71 #include "windef.h"
  72 #include "winbase.h"
  73 #include "winuser.h"
  74 #include "winerror.h"
  75 #include "win.h"
  76 #include "user_private.h"
  77 #include "wine/server.h"
  78 #include "wine/unicode.h"
  79 #include "wine/debug.h"
  80 #include "winternl.h"
  81
  82 WINE_DEFAULT_DEBUG_CHANNEL(hook);
  83 WINE_DECLARE_DEBUG_CHANNEL(relay);
  84
  85 struct hook_info
  86 {
  87     INT id;
  88     void *proc;
  89     void *handle;
  90     DWORD pid, tid;
  91     BOOL prev_unicode, next_unicode;
  92     WCHAR module[MAX_PATH];
  93 };
  94
  95 #define WH_WINEVENT (WH_MAXHOOK+1)
  96
  97 static const char * const hook_names[WH_WINEVENT - WH_MINHOOK + 1] =
  98 {
  99     "WH_MSGFILTER",
 100     "WH_JOURNALRECORD",
 101     "WH_JOURNALPLAYBACK",
 102     "WH_KEYBOARD",
 103     "WH_GETMESSAGE",
 104     "WH_CALLWNDPROC",
 105     "WH_CBT",
 106     "WH_SYSMSGFILTER",
 107     "WH_MOUSE",
 108     "WH_HARDWARE",
 109     "WH_DEBUG",
 110     "WH_SHELL",
 111     "WH_FOREGROUNDIDLE",
 112     "WH_CALLWNDPROCRET",
 113     "WH_KEYBOARD_LL",
 114     "WH_MOUSE_LL",
 115     "WH_WINEVENT"
 116 };
 117
 118
 119 /***********************************************************************
 120  *              get_ll_hook_timeout
 121  *
 122  */
 123 static UINT get_ll_hook_timeout(void)
 124 {
 125     /* FIXME: should retrieve LowLevelHooksTimeout in HKEY_CURRENT_USER\Control Panel\Desktop */
 126     return 2000;
 127 }
 128
 129
 130 /***********************************************************************
 131  *              set_windows_hook
 132  *
 133  * Implementation of SetWindowsHookExA and SetWindowsHookExW.
 134  */
 135 static HHOOK set_windows_hook( INT id, HOOKPROC proc, HINSTANCE inst, DWORD tid, BOOL unicode )
 136 {
 137     HHOOK handle = 0;
 138     WCHAR module[MAX_PATH];
 139     DWORD len;
 140
 141     if (!proc)
 142     {
 143         SetLastError( ERROR_INVALID_FILTER_PROC );
 144         return 0;
 145     }
 146
 147     if (tid)  /* thread-local hook */
 148     {
 149         if (id == WH_JOURNALRECORD ||
 150             id == WH_JOURNALPLAYBACK ||
 151             id == WH_KEYBOARD_LL ||
 152             id == WH_MOUSE_LL ||
 153             id == WH_SYSMSGFILTER)
 154         {
 155             /* these can only be global */
 156             SetLastError( ERROR_INVALID_PARAMETER );
 157             return 0;
 158         }
 159     }
 160     else  /* system-global hook */
 161     {
 162         if (id == WH_KEYBOARD_LL || id == WH_MOUSE_LL) inst = 0;
 163         else if (!inst)
 164         {
 165             SetLastError( ERROR_HOOK_NEEDS_HMOD );
 166             return 0;
 167         }
 168     }
 169
 170     if (inst && (!(len = GetModuleFileNameW( inst, module, MAX_PATH )) || len >= MAX_PATH))
 171     {
 172         SetLastError( ERROR_INVALID_PARAMETER );
 173         return 0;
 174     }
 175
 176     SERVER_START_REQ( set_hook )
 177     {
 178         req->id        = id;
 179         req->pid       = 0;
 180         req->tid       = tid;
 181         req->event_min = EVENT_MIN;
 182         req->event_max = EVENT_MAX;
 183         req->flags     = WINEVENT_INCONTEXT;
 184         req->unicode   = unicode;
 185         if (inst) /* make proc relative to the module base */
 186         {
 187             req->proc = wine_server_client_ptr( (void *)((char *)proc - (char *)inst) );
 188             wine_server_add_data( req, module, strlenW(module) * sizeof(WCHAR) );
 189         }
 190         else req->proc = wine_server_client_ptr( proc );
 191
 192         if (!wine_server_call_err( req ))
 193         {
 194             handle = wine_server_ptr_handle( reply->handle );
 195             get_user_thread_info()->active_hooks = reply->active_hooks;
 196         }
 197     }
 198     SERVER_END_REQ;
 199
 200     TRACE( "%s %p %x -> %p\n", hook_names[id-WH_MINHOOK], proc, tid, handle );
 201     return handle;
 202 }
 203
 204
 205 /***********************************************************************
 206  *              call_hook_AtoW
 207  */
 208 static LRESULT call_hook_AtoW( HOOKPROC proc, INT id, INT code, WPARAM wparam, LPARAM lparam )
 209 {
 210     LRESULT ret;
 211     UNICODE_STRING usBuffer;
 212     if (id != WH_CBT || code != HCBT_CREATEWND) ret = proc( code, wparam, lparam );
 213     else
 214     {
 215         CBT_CREATEWNDA *cbtcwA = (CBT_CREATEWNDA *)lparam;
 216         CBT_CREATEWNDW cbtcwW;
 217         CREATESTRUCTW csW;
 218         LPWSTR nameW = NULL;
 219         LPWSTR classW = NULL;
 220
 221         cbtcwW.lpcs = &csW;
 222         cbtcwW.hwndInsertAfter = cbtcwA->hwndInsertAfter;
 223         csW = *(CREATESTRUCTW *)cbtcwA->lpcs;
 224
 225         if (HIWORD(cbtcwA->lpcs->lpszName))
 226         {
 227             RtlCreateUnicodeStringFromAsciiz(&usBuffer,cbtcwA->lpcs->lpszName);
 228             csW.lpszName = nameW = usBuffer.Buffer;
 229         }
 230         if (HIWORD(cbtcwA->lpcs->lpszClass))
 231         {
 232             RtlCreateUnicodeStringFromAsciiz(&usBuffer,cbtcwA->lpcs->lpszClass);
 233             csW.lpszClass = classW = usBuffer.Buffer;
 234         }
 235         ret = proc( code, wparam, (LPARAM)&cbtcwW );
 236         cbtcwA->hwndInsertAfter = cbtcwW.hwndInsertAfter;
 237         HeapFree( GetProcessHeap(), 0, nameW );
 238         HeapFree( GetProcessHeap(), 0, classW );
 239     }
 240     return ret;
 241 }
 242
 243
 244 /***********************************************************************
 245  *              call_hook_WtoA
 246  */
 247 static LRESULT call_hook_WtoA( HOOKPROC proc, INT id, INT code, WPARAM wparam, LPARAM lparam )
 248 {
 249     LRESULT ret;
 250
 251     if (id != WH_CBT || code != HCBT_CREATEWND) ret = proc( code, wparam, lparam );
 252     else
 253     {
 254         CBT_CREATEWNDW *cbtcwW = (CBT_CREATEWNDW *)lparam;
 255         CBT_CREATEWNDA cbtcwA;
 256         CREATESTRUCTA csA;
 257         int len;
 258         LPSTR nameA = NULL;
 259         LPSTR classA = NULL;
 260
 261         cbtcwA.lpcs = &csA;
 262         cbtcwA.hwndInsertAfter = cbtcwW->hwndInsertAfter;
 263         csA = *(CREATESTRUCTA *)cbtcwW->lpcs;
 264
 265         if (HIWORD(cbtcwW->lpcs->lpszName)) {
 266             len = WideCharToMultiByte( CP_ACP, 0, cbtcwW->lpcs->lpszName, -1, NULL, 0, NULL, NULL );
 267             nameA = HeapAlloc( GetProcessHeap(), 0, len*sizeof(CHAR) );
 268             WideCharToMultiByte( CP_ACP, 0, cbtcwW->lpcs->lpszName, -1, nameA, len, NULL, NULL );
 269             csA.lpszName = nameA;
 270         }
 271
 272         if (HIWORD(cbtcwW->lpcs->lpszClass)) {
 273             len = WideCharToMultiByte( CP_ACP, 0, cbtcwW->lpcs->lpszClass, -1, NULL, 0, NULL, NULL );
 274             classA = HeapAlloc( GetProcessHeap(), 0, len*sizeof(CHAR) );
 275             WideCharToMultiByte( CP_ACP, 0, cbtcwW->lpcs->lpszClass, -1, classA, len, NULL, NULL );
 276             csA.lpszClass = classA;
 277         }
 278
 279         ret = proc( code, wparam, (LPARAM)&cbtcwA );
 280         cbtcwW->hwndInsertAfter = cbtcwA.hwndInsertAfter;
 281         HeapFree( GetProcessHeap(), 0, nameA );
 282         HeapFree( GetProcessHeap(), 0, classA );
 283     }
 284     return ret;
 285 }
 286
 287
 288 /***********************************************************************
 289  *              call_hook_proc
 290  */
 291 static LRESULT call_hook_proc( HOOKPROC proc, INT id, INT code, WPARAM wparam, LPARAM lparam,
 292                                BOOL prev_unicode, BOOL next_unicode )
 293 {
 294     LRESULT ret;
 295
 296     if (TRACE_ON(relay))
 297         DPRINTF( "%04x:Call hook proc %p (id=%s,code=%x,wp=%08lx,lp=%08lx)\n",
 298                  GetCurrentThreadId(), proc, hook_names[id-WH_MINHOOK], code, wparam, lparam );
 299
 300     if (!prev_unicode == !next_unicode) ret = proc( code, wparam, lparam );
 301     else if (prev_unicode) ret = call_hook_WtoA( proc, id, code, wparam, lparam );
 302     else ret = call_hook_AtoW( proc, id, code, wparam, lparam );
 303
 304     if (TRACE_ON(relay))
 305         DPRINTF( "%04x:Ret  hook proc %p (id=%s,code=%x,wp=%08lx,lp=%08lx) retval=%08lx\n",
 306                  GetCurrentThreadId(), proc, hook_names[id-WH_MINHOOK], code, wparam, lparam, ret );
 307
 308     return ret;
 309 }
 310
 311
 312 /***********************************************************************
 313  *              get_hook_proc
 314  *
 315  * Retrieve the hook procedure real value for a module-relative proc
 316  */
 317 void *get_hook_proc( void *proc, const WCHAR *module )
 318 {
 319     HMODULE mod;
 320
 321     if (!(mod = GetModuleHandleW(module)))
 322     {
 323         TRACE( "loading %s\n", debugstr_w(module) );
 324         /* FIXME: the library will never be freed */
 325         if (!(mod = LoadLibraryExW(module, NULL, LOAD_WITH_ALTERED_SEARCH_PATH))) return NULL;
 326     }
 327     return (char *)mod + (ULONG_PTR)proc;
 328 }
 329
 330 /***********************************************************************
 331  *              call_hook
 332  *
 333  * Call hook either in current thread or send message to the destination
 334  * thread.
 335  */
 336 static LRESULT call_hook( struct hook_info *info, INT code, WPARAM wparam, LPARAM lparam )
 337 {
 338     DWORD_PTR ret = 0;
 339
 340     if (info->tid)
 341     {
 342         struct hook_extra_info h_extra;
 343         h_extra.handle = info->handle;
 344         h_extra.lparam = lparam;
 345
 346         TRACE( "calling hook in thread %04x %s code %x wp %lx lp %lx\n",
 347                info->tid, hook_names[info->id-WH_MINHOOK], code, wparam, lparam );
 348
 349         switch(info->id)
 350         {
 351         case WH_KEYBOARD_LL:
 352             MSG_SendInternalMessageTimeout( info->pid, info->tid, WM_WINE_KEYBOARD_LL_HOOK,
 353                                             wparam, (LPARAM)&h_extra, SMTO_ABORTIFHUNG,
 354                                             get_ll_hook_timeout(), &ret );
 355             break;
 356         case WH_MOUSE_LL:
 357             MSG_SendInternalMessageTimeout( info->pid, info->tid, WM_WINE_MOUSE_LL_HOOK,
 358                                             wparam, (LPARAM)&h_extra, SMTO_ABORTIFHUNG,
 359                                             get_ll_hook_timeout(), &ret );
 360             break;
 361         default:
 362             ERR("Unknown hook id %d\n", info->id);
 363             assert(0);
 364             break;
 365         }
 366     }
 367     else if (info->proc)
 368     {
 369         TRACE( "calling hook %p %s code %x wp %lx lp %lx module %s\n",
 370                info->proc, hook_names[info->id-WH_MINHOOK], code, wparam,
 371                lparam, debugstr_w(info->module) );
 372
 373         if (!info->module[0] ||
 374             (info->proc = get_hook_proc( info->proc, info->module )) != NULL)
 375         {
 376             struct user_thread_info *thread_info = get_user_thread_info();
 377             HHOOK prev = thread_info->hook;
 378             BOOL prev_unicode = thread_info->hook_unicode;
 379
 380             thread_info->hook = info->handle;
 381             thread_info->hook_unicode = info->next_unicode;
 382             ret = call_hook_proc( info->proc, info->id, code, wparam, lparam,
 383                                   info->prev_unicode, info->next_unicode );
 384             thread_info->hook = prev;
 385             thread_info->hook_unicode = prev_unicode;
 386         }
 387     }
 388     return ret;
 389 }
 390
 391
 392 /***********************************************************************
 393  *           HOOK_IsHooked
 394  */
 395 static BOOL HOOK_IsHooked( INT id )
 396 {
 397     struct user_thread_info *thread_info = get_user_thread_info();
 398
 399     if (!thread_info->active_hooks) return TRUE;
 400     return (thread_info->active_hooks & (1 << (id - WH_MINHOOK))) != 0;
 401 }
 402
 403
 404 /***********************************************************************
 405  *              HOOK_CallHooks
 406  */
 407 LRESULT HOOK_CallHooks( INT id, INT code, WPARAM wparam, LPARAM lparam, BOOL unicode )
 408 {
 409     struct user_thread_info *thread_info = get_user_thread_info();
 410     struct hook_info info;
 411     DWORD_PTR ret = 0;
 412
 413     USER_CheckNotLock();
 414
 415     if (!HOOK_IsHooked( id ))
 416     {
 417         TRACE( "skipping hook %s mask %x\n", hook_names[id-WH_MINHOOK], thread_info->active_hooks );
 418         return 0;
 419     }
 420
 421     ZeroMemory( &info, sizeof(info) - sizeof(info.module) );
 422     info.prev_unicode = unicode;
 423     info.id = id;
 424
 425     SERVER_START_REQ( start_hook_chain )
 426     {
 427         req->id = info.id;
 428         req->event = EVENT_MIN;
 429         wine_server_set_reply( req, info.module, sizeof(info.module)-sizeof(WCHAR) );
 430         if (!wine_server_call( req ))
 431         {
 432             info.module[wine_server_reply_size(req) / sizeof(WCHAR)] = 0;
 433             info.handle       = wine_server_ptr_handle( reply->handle );
 434             info.pid          = reply->pid;
 435             info.tid          = reply->tid;
 436             info.proc         = wine_server_get_ptr( reply->proc );
 437             info.next_unicode = reply->unicode;
 438             thread_info->active_hooks = reply->active_hooks;
 439         }
 440     }
 441     SERVER_END_REQ;
 442
 443     if (!info.tid && !info.proc) return 0;
 444     ret = call_hook( &info, code, wparam, lparam );
 445
 446     SERVER_START_REQ( finish_hook_chain )
 447     {
 448         req->id = id;
 449         wine_server_call( req );
 450     }
 451     SERVER_END_REQ;
 452     return ret;
 453 }
 454
 455
 456 /***********************************************************************
 457  *              SetWindowsHookA (USER32.@)
 458  */
 459 HHOOK WINAPI SetWindowsHookA( INT id, HOOKPROC proc )
 460 {
 461     return SetWindowsHookExA( id, proc, 0, GetCurrentThreadId() );
 462 }
 463
 464
 465 /***********************************************************************
 466  *              SetWindowsHookW (USER32.@)
 467  */
 468 HHOOK WINAPI SetWindowsHookW( INT id, HOOKPROC proc )
 469 {
 470     return SetWindowsHookExW( id, proc, 0, GetCurrentThreadId() );
 471 }
 472
 473
 474 /***********************************************************************
 475  *              SetWindowsHookExA (USER32.@)
 476  */
 477 HHOOK WINAPI SetWindowsHookExA( INT id, HOOKPROC proc, HINSTANCE inst, DWORD tid )
 478 {
 479     return set_windows_hook( id, proc, inst, tid, FALSE );
 480 }
 481
 482 /***********************************************************************
 483  *              SetWindowsHookExW (USER32.@)
 484  */
 485 HHOOK WINAPI SetWindowsHookExW( INT id, HOOKPROC proc, HINSTANCE inst, DWORD tid )
 486 {
 487     return set_windows_hook( id, proc, inst, tid, TRUE );
 488 }
 489
 490
 491 /***********************************************************************
 492  *              UnhookWindowsHook (USER32.@)
 493  */
 494 BOOL WINAPI UnhookWindowsHook( INT id, HOOKPROC proc )
 495 {
 496     BOOL ret;
 497
 498     TRACE( "%s %p\n", hook_names[id-WH_MINHOOK], proc );
 499
 500     SERVER_START_REQ( remove_hook )
 501     {
 502         req->handle = 0;
 503         req->id   = id;
 504         req->proc = wine_server_client_ptr( proc );
 505         ret = !wine_server_call_err( req );
 506         if (ret) get_user_thread_info()->active_hooks = reply->active_hooks;
 507     }
 508     SERVER_END_REQ;
 509     if (!ret && GetLastError() == ERROR_INVALID_HANDLE) SetLastError( ERROR_INVALID_HOOK_HANDLE );
 510     return ret;
 511 }
 512
 513
 514
 515 /***********************************************************************
 516  *              UnhookWindowsHookEx (USER32.@)
 517  */
 518 BOOL WINAPI UnhookWindowsHookEx( HHOOK hhook )
 519 {
 520     BOOL ret;
 521
 522     SERVER_START_REQ( remove_hook )
 523     {
 524         req->handle = wine_server_user_handle( hhook );
 525         req->id     = 0;
 526         ret = !wine_server_call_err( req );
 527         if (ret) get_user_thread_info()->active_hooks = reply->active_hooks;
 528     }
 529     SERVER_END_REQ;
 530     if (!ret && GetLastError() == ERROR_INVALID_HANDLE) SetLastError( ERROR_INVALID_HOOK_HANDLE );
 531     return ret;
 532 }
 533
 534
 535 /***********************************************************************
 536  *              CallNextHookEx (USER32.@)
 537  */
 538 LRESULT WINAPI CallNextHookEx( HHOOK hhook, INT code, WPARAM wparam, LPARAM lparam )
 539 {
 540     struct user_thread_info *thread_info = get_user_thread_info();
 541     struct hook_info info;
 542
 543     ZeroMemory( &info, sizeof(info) - sizeof(info.module) );
 544
 545     SERVER_START_REQ( get_hook_info )
 546     {
 547         req->handle = wine_server_user_handle( thread_info->hook );
 548         req->get_next = 1;
 549         req->event = EVENT_MIN;
 550         wine_server_set_reply( req, info.module, sizeof(info.module)-sizeof(WCHAR) );
 551         if (!wine_server_call_err( req ))
 552         {
 553             info.module[wine_server_reply_size(req) / sizeof(WCHAR)] = 0;
 554             info.handle       = wine_server_ptr_handle( reply->handle );
 555             info.id           = reply->id;
 556             info.pid          = reply->pid;
 557             info.tid          = reply->tid;
 558             info.proc         = wine_server_get_ptr( reply->proc );
 559             info.next_unicode = reply->unicode;
 560         }
 561     }
 562     SERVER_END_REQ;
 563
 564     info.prev_unicode = thread_info->hook_unicode;
 565     return call_hook( &info, code, wparam, lparam );
 566 }
 567
 568
 569 LRESULT call_current_hook( HHOOK hhook, INT code, WPARAM wparam, LPARAM lparam )
 570 {
 571     struct hook_info info;
 572
 573     ZeroMemory( &info, sizeof(info) - sizeof(info.module) );
 574
 575     SERVER_START_REQ( get_hook_info )
 576     {
 577         req->handle = wine_server_user_handle( hhook );
 578         req->get_next = 0;
 579         req->event = EVENT_MIN;
 580         wine_server_set_reply( req, info.module, sizeof(info.module)-sizeof(WCHAR) );
 581         if (!wine_server_call_err( req ))
 582         {
 583             info.module[wine_server_reply_size(req) / sizeof(WCHAR)] = 0;
 584             info.handle       = wine_server_ptr_handle( reply->handle );
 585             info.id           = reply->id;
 586             info.pid          = reply->pid;
 587             info.tid          = reply->tid;
 588             info.proc         = wine_server_get_ptr( reply->proc );
 589             info.next_unicode = reply->unicode;
 590         }
 591     }
 592     SERVER_END_REQ;
 593
 594     info.prev_unicode = TRUE;  /* assume Unicode for this function */
 595     return call_hook( &info, code, wparam, lparam );
 596 }
 597
 598 /***********************************************************************
 599  *              CallMsgFilterA (USER32.@)
 600  */
 601 BOOL WINAPI CallMsgFilterA( LPMSG msg, INT code )
 602 {
 603     if (HOOK_CallHooks( WH_SYSMSGFILTER, code, 0, (LPARAM)msg, FALSE )) return TRUE;
 604     return HOOK_CallHooks( WH_MSGFILTER, code, 0, (LPARAM)msg, FALSE );
 605 }
 606
 607
 608 /***********************************************************************
 609  *              CallMsgFilterW (USER32.@)
 610  */
 611 BOOL WINAPI CallMsgFilterW( LPMSG msg, INT code )
 612 {
 613     if (HOOK_CallHooks( WH_SYSMSGFILTER, code, 0, (LPARAM)msg, TRUE )) return TRUE;
 614     return HOOK_CallHooks( WH_MSGFILTER, code, 0, (LPARAM)msg, TRUE );
 615 }
 616
 617
 618 /***********************************************************************
 619  *           SetWinEventHook                            [USER32.@]
 620  *
 621  * Set up an event hook for a set of events.
 622  *
 623  * PARAMS
 624  *  event_min [I] Lowest event handled by pfnProc
 625  *  event_max [I] Highest event handled by pfnProc
 626  *  inst      [I] DLL containing pfnProc
 627  *  proc      [I] Callback event hook function
 628  *  pid       [I] Process to get events from, or 0 for all processes
 629  *  tid       [I] Thread to get events from, or 0 for all threads
 630  *  flags     [I] Flags indicating the status of pfnProc
 631  *
 632  * RETURNS
 633  *  Success: A handle representing the hook.
 634  *  Failure: A NULL handle.
 635  */
 636 HWINEVENTHOOK WINAPI SetWinEventHook(DWORD event_min, DWORD event_max,
 637                                      HMODULE inst, WINEVENTPROC proc,
 638                                      DWORD pid, DWORD tid, DWORD flags)
 639 {
 640     HWINEVENTHOOK handle = 0;
 641     WCHAR module[MAX_PATH];
 642     DWORD len;
 643
 644     TRACE("%d,%d,%p,%p,%08x,%04x,%08x\n", event_min, event_max, inst,
 645           proc, pid, tid, flags);
 646
 647     if (inst)
 648     {
 649         if (!(len = GetModuleFileNameW(inst, module, MAX_PATH)) || len >= MAX_PATH)
 650             inst = 0;
 651     }
 652
 653     if ((flags & WINEVENT_INCONTEXT) && !inst)
 654     {
 655         SetLastError(ERROR_HOOK_NEEDS_HMOD);
 656         return 0;
 657     }
 658
 659     if (event_min > event_max)
 660     {
 661         SetLastError(ERROR_INVALID_HOOK_FILTER);
 662         return 0;
 663     }
 664
 665     /* FIXME: what if the tid or pid belongs to another process? */
 666     if (tid)  /* thread-local hook */
 667         inst = 0;
 668
 669     SERVER_START_REQ( set_hook )
 670     {
 671         req->id        = WH_WINEVENT;
 672         req->pid       = pid;
 673         req->tid       = tid;
 674         req->event_min = event_min;
 675         req->event_max = event_max;
 676         req->flags     = flags;
 677         req->unicode   = 1;
 678         if (inst) /* make proc relative to the module base */
 679         {
 680             req->proc = wine_server_client_ptr( (void *)((char *)proc - (char *)inst) );
 681             wine_server_add_data( req, module, strlenW(module) * sizeof(WCHAR) );
 682         }
 683         else req->proc = wine_server_client_ptr( proc );
 684
 685         if (!wine_server_call_err( req ))
 686         {
 687             handle = wine_server_ptr_handle( reply->handle );
 688             get_user_thread_info()->active_hooks = reply->active_hooks;
 689         }
 690     }
 691     SERVER_END_REQ;
 692
 693     TRACE("-> %p\n", handle);
 694     return handle;
 695 }
 696
 697
 698 /***********************************************************************
 699  *           UnhookWinEvent                             [USER32.@]
 700  *
 701  * Remove an event hook for a set of events.
 702  *
 703  * PARAMS
 704  *  hEventHook [I] Event hook to remove
 705  *
 706  * RETURNS
 707  *  Success: TRUE. The event hook has been removed.
 708  *  Failure: FALSE, if hEventHook is invalid.
 709  */
 710 BOOL WINAPI UnhookWinEvent(HWINEVENTHOOK hEventHook)
 711 {
 712     BOOL ret;
 713
 714     SERVER_START_REQ( remove_hook )
 715     {
 716         req->handle = wine_server_user_handle( hEventHook );
 717         req->id     = WH_WINEVENT;
 718         ret = !wine_server_call_err( req );
 719         if (ret) get_user_thread_info()->active_hooks = reply->active_hooks;
 720     }
 721     SERVER_END_REQ;
 722     return ret;
 723 }
 724
 725 static inline BOOL find_first_hook(DWORD id, DWORD event, HWND hwnd, LONG object_id,
 726                                    LONG child_id, struct hook_info *info)
 727 {
 728     struct user_thread_info *thread_info = get_user_thread_info();
 729     BOOL ret;
 730
 731     if (!HOOK_IsHooked( id ))
 732     {
 733         TRACE( "skipping hook %s mask %x\n", hook_names[id-WH_MINHOOK], thread_info->active_hooks );
 734         return FALSE;
 735     }
 736
 737     SERVER_START_REQ( start_hook_chain )
 738     {
 739         req->id = id;
 740         req->event = event;
 741         req->window = wine_server_user_handle( hwnd );
 742         req->object_id = object_id;
 743         req->child_id = child_id;
 744         wine_server_set_reply( req, info->module, sizeof(info->module)-sizeof(WCHAR) );
 745         ret = !wine_server_call( req );
 746         if (ret)
 747         {
 748             info->module[wine_server_reply_size(req) / sizeof(WCHAR)] = 0;
 749             info->handle    = wine_server_ptr_handle( reply->handle );
 750             info->proc      = wine_server_get_ptr( reply->proc );
 751             info->tid       = reply->tid;
 752             thread_info->active_hooks = reply->active_hooks;
 753         }
 754     }
 755     SERVER_END_REQ;
 756     return ret && (info->tid || info->proc);
 757 }
 758
 759 static inline BOOL find_next_hook(DWORD event, HWND hwnd, LONG object_id,
 760                                   LONG child_id, struct hook_info *info)
 761 {
 762     BOOL ret;
 763
 764     SERVER_START_REQ( get_hook_info )
 765     {
 766         req->handle = wine_server_user_handle( info->handle );
 767         req->get_next = 1;
 768         req->event = event;
 769         req->window = wine_server_user_handle( hwnd );
 770         req->object_id = object_id;
 771         req->child_id = child_id;
 772         wine_server_set_reply( req, info->module, sizeof(info->module)-sizeof(WCHAR) );
 773         ret = !wine_server_call( req );
 774         if (ret)
 775         {
 776             info->module[wine_server_reply_size(req) / sizeof(WCHAR)] = 0;
 777             info->handle    = wine_server_ptr_handle( reply->handle );
 778             info->proc      = wine_server_get_ptr( reply->proc );
 779             info->tid       = reply->tid;
 780         }
 781     }
 782     SERVER_END_REQ;
 783     return ret;
 784 }
 785
 786 static inline void find_hook_close(DWORD id)
 787 {
 788     SERVER_START_REQ( finish_hook_chain )
 789     {
 790         req->id = id;
 791         wine_server_call( req );
 792     }
 793     SERVER_END_REQ;
 794 }
 795
 796 /***********************************************************************
 797  *           NotifyWinEvent                             [USER32.@]
 798  *
 799  * Inform the OS that an event has occurred.
 800  *
 801  * PARAMS
 802  *  event     [I] Id of the event
 803  *  hwnd      [I] Window holding the object that created the event
 804  *  object_id [I] Type of object that created the event
 805  *  child_id  [I] Child object of nId, or CHILDID_SELF.
 806  *
 807  * RETURNS
 808  *  Nothing.
 809  */
 810 void WINAPI NotifyWinEvent(DWORD event, HWND hwnd, LONG object_id, LONG child_id)
 811 {
 812     struct hook_info info;
 813
 814     TRACE("%04x,%p,%d,%d\n", event, hwnd, object_id, child_id);
 815
 816     if (!hwnd)
 817     {
 818         SetLastError(ERROR_INVALID_WINDOW_HANDLE);
 819         return;
 820     }
 821
 822     USER_CheckNotLock();
 823
 824 #if 0
 825     if (event & 0x80000000)
 826     {
 827         /* FIXME: on 64-bit platforms we need to invent some other way for
 828          * passing parameters, nId and nChildId can't hold full [W|L]PARAM.
 829          * struct call_hook *hook = (LRESULT *)hWnd;
 830          * wparam = hook->wparam;
 831          * lparam = hook->lparam;
 832          */
 833         LRESULT *ret = (LRESULT *)hwnd;
 834         INT id, code, unicode;
 835
 836         id = (dwEvent & 0x7fff0000) >> 16;
 837         code = event & 0x7fff;
 838         unicode = event & 0x8000;
 839         *ret = HOOK_CallHooks(id, code, object_id, child_id, unicode);
 840         return;
 841     }
 842 #endif
 843
 844     if (!find_first_hook(WH_WINEVENT, event, hwnd, object_id, child_id, &info)) return;
 845
 846     do
 847     {
 848         WINEVENTPROC proc = info.proc;
 849         if (proc)
 850         {
 851             TRACE( "calling WH_WINEVENT hook %p event %x hwnd %p %x %x module %s\n",
 852                    proc, event, hwnd, object_id, child_id, debugstr_w(info.module) );
 853
 854             if (!info.module[0] || (proc = get_hook_proc( proc, info.module )) != NULL)
 855             {
 856                 if (TRACE_ON(relay))
 857                     DPRINTF( "%04x:Call winevent hook proc %p (hhook=%p,event=%x,hwnd=%p,object_id=%x,child_id=%x,tid=%04x,time=%x)\n",
 858                              GetCurrentThreadId(), proc, info.handle, event, hwnd, object_id,
 859                              child_id, GetCurrentThreadId(), GetCurrentTime());
 860
 861                 proc( info.handle, event, hwnd, object_id, child_id,
 862                       GetCurrentThreadId(), GetCurrentTime());
 863
 864                 if (TRACE_ON(relay))
 865                     DPRINTF( "%04x:Ret  winevent hook proc %p (hhook=%p,event=%x,hwnd=%p,object_id=%x,child_id=%x,tid=%04x,time=%x)\n",
 866                              GetCurrentThreadId(), proc, info.handle, event, hwnd, object_id,
 867                              child_id, GetCurrentThreadId(), GetCurrentTime());
 868             }
 869         }
 870         else
 871             break;
 872     }
 873     while (find_next_hook(event, hwnd, object_id, child_id, &info));
 874
 875     find_hook_close(WH_WINEVENT);
 876 }
 877
 878
 879 /***********************************************************************
 880  *           IsWinEventHookInstalled                       [USER32.@]
 881  *
 882  * Determine if an event hook is installed for an event.
 883  *
 884  * PARAMS
 885  *  dwEvent  [I] Id of the event
 886  *
 887  * RETURNS
 888  *  TRUE,  If there are any hooks installed for the event.
 889  *  FALSE, Otherwise.
 890  *
 891  * BUGS
 892  *  Not implemented.
 893  */
 894 BOOL WINAPI IsWinEventHookInstalled(DWORD dwEvent)
 895 {
 896     /* FIXME: Needed by Office 2007 installer */
 897     WARN("(%d)-stub!\n", dwEvent);
 898     return TRUE;
 899 }