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   1 /*
   2  * Windows hook functions
   3  *
   4  * Copyright 1994, 1995 Alexandre Julliard
   5  *
   6  * Based on investigations by Alex Korobka
   7  */
   8
   9 /*
  10  * Warning!
  11  * A HHOOK is a 32-bit handle for compatibility with Windows 3.0 where it was
  12  * a pointer to the next function. Now it is in fact composed of a USER heap
  13  * handle in the low 16 bits and of a HOOK_MAGIC value in the high 16 bits.
  14  */
  15
  16 #define NO_TRANSITION_TYPES  /* This file is Win32-clean */
  17 #include "hook.h"
  18 #include "queue.h"
  19 #include "user.h"
  20 #include "stddebug.h"
  21 #include "debug.h"
  22
  23 #pragma pack(1)
  24
  25   /* Hook data (pointed to by a HHOOK) */
  26 typedef struct
  27 {
  28     HANDLE16   next;               /* 00 Next hook in chain */
  29     HOOKPROC16 proc WINE_PACKED;   /* 02 Hook procedure */
  30     INT16      id;                 /* 06 Hook id (WH_xxx) */
  31     HQUEUE16   ownerQueue;         /* 08 Owner queue (0 for system hook) */
  32     HMODULE16  ownerModule;        /* 0a Owner module */
  33     WORD       inHookProc;         /* 0c TRUE if in this->proc */
  34 } HOOKDATA;
  35
  36 #pragma pack(4)
  37
  38 #define HOOK_MAGIC  ((int)'H' | (int)'K' << 8)  /* 'HK' */
  39
  40   /* This should probably reside in USER heap */
  41 static HANDLE16 HOOK_systemHooks[WH_NB_HOOKS] = { 0, };
  42
  43
  44 /***********************************************************************
  45  *           HOOK_GetNextHook
  46  *
  47  * Get the next hook of a given hook.
  48  */
  49 static HANDLE16 HOOK_GetNextHook( HANDLE16 hook )
  50 {
  51     HOOKDATA *data = (HOOKDATA *)USER_HEAP_LIN_ADDR( hook );
  52     if (!data || !hook) return 0;
  53     if (data->next) return data->next;
  54     if (!data->ownerQueue) return 0;  /* Already system hook */
  55     /* Now start enumerating the system hooks */
  56     return HOOK_systemHooks[data->id - WH_MINHOOK];
  57 }
  58
  59
  60 /***********************************************************************
  61  *           HOOK_GetHook
  62  *
  63  * Get the first hook for a given type.
  64  */
  65 HANDLE16 HOOK_GetHook( INT16 id , HQUEUE16 hQueue )
  66 {
  67     MESSAGEQUEUE *queue;
  68     HANDLE16 hook = 0;
  69
  70     if ((queue = (MESSAGEQUEUE *)GlobalLock16( hQueue )) != NULL)
  71         hook = queue->hooks[id - WH_MINHOOK];
  72     if (!hook) hook = HOOK_systemHooks[id - WH_MINHOOK];
  73     return hook;
  74 }
  75
  76
  77 /***********************************************************************
  78  *           HOOK_GetProc16
  79  */
  80 HOOKPROC16 HOOK_GetProc16( HHOOK hhook )
  81 {
  82     HOOKDATA *data;
  83     if (HIWORD(hhook) != HOOK_MAGIC) return NULL;
  84     if (!(data = (HOOKDATA *)USER_HEAP_LIN_ADDR( LOWORD(hhook) ))) return NULL;
  85     return data->proc;
  86 }
  87
  88
  89 /***********************************************************************
  90  *           HOOK_SetHook
  91  *
  92  * Install a given hook.
  93  */
  94 static HANDLE16 HOOK_SetHook( INT16 id, HOOKPROC16 proc, HINSTANCE16 hInst,
  95                               HTASK16 hTask )
  96 {
  97     HOOKDATA *data;
  98     HANDLE16 handle;
  99     HQUEUE16 hQueue = 0;
 100
 101     if ((id < WH_MINHOOK) || (id > WH_MAXHOOK)) return 0;
 102     if (!(hInst = GetExePtr( hInst ))) return 0;
 103
 104     dprintf_hook( stddeb, "Setting hook %d: %08x %04x %04x\n",
 105                   id, (UINT32)proc, hInst, hTask );
 106
 107     if (hTask)  /* Task-specific hook */
 108     {
 109         if ((id == WH_JOURNALRECORD) || (id == WH_JOURNALPLAYBACK) ||
 110             (id == WH_SYSMSGFILTER)) return 0;  /* System-only hooks */
 111         if (!(hQueue = GetTaskQueue( hTask ))) return 0;
 112     }
 113
 114     if (id == WH_DEBUG)
 115     {
 116         fprintf( stdnimp,"WH_DEBUG is broken in 16-bit Windows.\n");
 117         return 0;
 118     }
 119     else if (id == WH_CBT || id == WH_SHELL)
 120     {
 121         fprintf( stdnimp, "Half-implemented hook set: (%s,%08lx,%04x,%04x)!\n",
 122                  (id==WH_CBT)?"WH_CBT":"WH_SHELL", (DWORD)proc, hInst, hTask );
 123     }
 124
 125     if (id == WH_JOURNALPLAYBACK) EnableHardwareInput(FALSE);
 126
 127     /* Create the hook structure */
 128
 129     if (!(handle = USER_HEAP_ALLOC( sizeof(HOOKDATA) ))) return 0;
 130     data = (HOOKDATA *) USER_HEAP_LIN_ADDR( handle );
 131     data->proc        = proc;
 132     data->id          = id;
 133     data->ownerQueue  = hQueue;
 134     data->ownerModule = hInst;
 135     data->inHookProc  = 0;
 136     dprintf_hook( stddeb, "Setting hook %d: ret=%04x\n", id, handle );
 137
 138     /* Insert it in the correct linked list */
 139
 140     if (hQueue)
 141     {
 142         MESSAGEQUEUE *queue = (MESSAGEQUEUE *)GlobalLock16( hQueue );
 143         data->next = queue->hooks[id - WH_MINHOOK];
 144         queue->hooks[id - WH_MINHOOK] = handle;
 145     }
 146     else
 147     {
 148         data->next = HOOK_systemHooks[id - WH_MINHOOK];
 149         HOOK_systemHooks[id - WH_MINHOOK] = handle;
 150     }
 151     return handle;
 152 }
 153
 154
 155 /***********************************************************************
 156  *           HOOK_RemoveHook
 157  *
 158  * Remove a hook from the list.
 159  */
 160 static BOOL32 HOOK_RemoveHook( HANDLE16 hook )
 161 {
 162     HOOKDATA *data;
 163     HANDLE16 *prevHook;
 164
 165     dprintf_hook( stddeb, "Removing hook %04x\n", hook );
 166
 167     if (!(data = (HOOKDATA *)USER_HEAP_LIN_ADDR(hook))) return FALSE;
 168     if (data->inHookProc)
 169     {
 170         /* Mark it for deletion later on */
 171         dprintf_hook( stddeb, "Hook still running, deletion delayed\n" );
 172         data->proc = (HOOKPROC16)0;
 173         return TRUE;
 174     }
 175
 176     if (data->id == WH_JOURNALPLAYBACK) EnableHardwareInput(TRUE);
 177
 178     /* Remove it from the linked list */
 179
 180     if (data->ownerQueue)
 181     {
 182         MESSAGEQUEUE *queue = (MESSAGEQUEUE *)GlobalLock16( data->ownerQueue );
 183         if (!queue) return FALSE;
 184         prevHook = &queue->hooks[data->id - WH_MINHOOK];
 185     }
 186     else prevHook = &HOOK_systemHooks[data->id - WH_MINHOOK];
 187
 188     while (*prevHook && *prevHook != hook)
 189         prevHook = &((HOOKDATA *)USER_HEAP_LIN_ADDR(*prevHook))->next;
 190
 191      if (!*prevHook) return FALSE;
 192     *prevHook = data->next;
 193     USER_HEAP_FREE( hook );
 194     return TRUE;
 195 }
 196
 197
 198 /***********************************************************************
 199  *           HOOK_CallHook
 200  *
 201  * Call a hook procedure.
 202  */
 203 static LRESULT HOOK_CallHook( HANDLE16 hook, INT16 code,
 204                               WPARAM16 wParam, LPARAM lParam )
 205 {
 206     HOOKDATA *data;
 207     MESSAGEQUEUE *queue;
 208     HANDLE16 prevHook;
 209     LRESULT ret;
 210
 211     /* Find the first hook with a valid proc */
 212
 213     for (;;)
 214     {
 215         if (!hook) return 0;
 216         if (!(data = (HOOKDATA *)USER_HEAP_LIN_ADDR(hook))) return 0;
 217         if (data->proc) break;
 218         hook = data->next;
 219     }
 220
 221     /* Now call it */
 222
 223     if (!(queue = (MESSAGEQUEUE *)GlobalLock16( GetTaskQueue(0) ))) return 0;
 224     prevHook = queue->hCurHook;
 225     queue->hCurHook = hook;
 226     data->inHookProc = 1;
 227
 228     dprintf_hook( stddeb, "Calling hook %04x: proc=%p %d %04lx %08lx\n",
 229                   hook, data->proc, code, (DWORD)wParam, lParam );
 230     ret = data->proc( code, wParam, lParam );
 231     dprintf_hook( stddeb, "Ret hook %04x = %08lx\n", hook, ret );
 232
 233     data->inHookProc = 0;
 234     queue->hCurHook = prevHook;
 235     if (!data->proc) HOOK_RemoveHook( hook );
 236     return ret;
 237 }
 238
 239
 240 /***********************************************************************
 241  *           HOOK_CallHooks
 242  *
 243  * Call a hook chain.
 244  */
 245 LRESULT HOOK_CallHooks( INT16 id, INT16 code, WPARAM16 wParam, LPARAM lParam )
 246 {
 247     HANDLE16 hook = HOOK_GetHook( id , GetTaskQueue(0) );
 248     if (!hook) return 0;
 249     return HOOK_CallHook( hook, code, wParam, lParam );
 250 }
 251
 252
 253 /***********************************************************************
 254  *           HOOK_FreeModuleHooks
 255  */
 256 void HOOK_FreeModuleHooks( HMODULE16 hModule )
 257 {
 258  /* remove all system hooks registered by this module */
 259
 260   HOOKDATA*     hptr;
 261   HHOOK         hook, next;
 262   int           id;
 263
 264   for( id = WH_MINHOOK; id <= WH_MAXHOOK; id++ )
 265     {
 266        hook = HOOK_systemHooks[id - WH_MINHOOK];
 267        while( hook )
 268           if( (hptr = (HOOKDATA *)USER_HEAP_LIN_ADDR(hook)) )
 269             {
 270               next = hptr->next;
 271               if( hptr->ownerModule == hModule )
 272                 {
 273                   hptr->inHookProc = 0;
 274                   HOOK_RemoveHook(hook);
 275                 }
 276               hook = next;
 277             }
 278           else hook = 0;
 279     }
 280 }
 281
 282 /***********************************************************************
 283  *           HOOK_FreeQueueHooks
 284  */
 285 void HOOK_FreeQueueHooks( HQUEUE16 hQueue )
 286 {
 287   /* remove all hooks registered by this queue */
 288
 289   HOOKDATA*     hptr = NULL;
 290   HHOOK         hook, next;
 291   int           id;
 292
 293   for( id = WH_MINHOOK; id <= WH_MAXHOOK; id++ )
 294     {
 295        hook = HOOK_GetHook( id, hQueue );
 296        while( hook )
 297         {
 298           next = HOOK_GetNextHook(hook);
 299
 300           hptr = (HOOKDATA *)USER_HEAP_LIN_ADDR(hook);
 301           if( hptr && hptr->ownerQueue == hQueue )
 302             {
 303               hptr->inHookProc = 0;
 304               HOOK_RemoveHook(hook);
 305             }
 306           hook = next;
 307         }
 308     }
 309 }
 310
 311
 312 /***********************************************************************
 313  *           SetWindowsHook16   (USER.121)
 314  */
 315 FARPROC16 SetWindowsHook16( INT16 id, HOOKPROC16 proc )
 316 {
 317     HTASK16     hTask = (id == WH_MSGFILTER) ? GetCurrentTask() : 0;
 318     HANDLE16    handle = HOOK_SetHook( id, proc, 0, hTask );
 319
 320     return (handle) ? (FARPROC16)MAKELONG( handle, HOOK_MAGIC ) : NULL;
 321 }
 322
 323
 324 /***********************************************************************
 325  *           UnhookWindowsHook16   (USER.234)
 326  */
 327 BOOL16 UnhookWindowsHook16( INT16 id, HOOKPROC16 proc )
 328 {
 329     HANDLE16 hook = HOOK_GetHook( id , 0 );
 330
 331     dprintf_hook( stddeb, "UnhookWindowsHook: %d %08lx\n", id, (DWORD)proc );
 332
 333     while (hook)
 334     {
 335         HOOKDATA *data = (HOOKDATA *)USER_HEAP_LIN_ADDR(hook);
 336         if (data->proc == proc) break;
 337         hook = HOOK_GetNextHook( hook );
 338     }
 339     if (!hook) return FALSE;
 340     return HOOK_RemoveHook( hook );
 341 }
 342
 343
 344 /***********************************************************************
 345  *           DefHookProc   (USER.235)
 346  */
 347 LRESULT DefHookProc( INT16 code, WPARAM16 wParam, LPARAM lParam, HHOOK *hhook )
 348 {
 349     /* Note: the *hhook parameter is never used, since we rely on the
 350      * current hook value from the task queue to find the next hook. */
 351     MESSAGEQUEUE *queue;
 352     HANDLE16 next;
 353
 354     if (!(queue = (MESSAGEQUEUE *)GlobalLock16( GetTaskQueue(0) ))) return 0;
 355     if (!(next = HOOK_GetNextHook( queue->hCurHook ))) return 0;
 356     return HOOK_CallHook( next, code, wParam, lParam );
 357 }
 358
 359
 360 /***********************************************************************
 361  *           CallMsgFilter   (USER.123)
 362  */
 363 BOOL16 CallMsgFilter( SEGPTR msg, INT16 code )
 364 {
 365     if (GetSysModalWindow16()) return FALSE;
 366     if (HOOK_CallHooks( WH_SYSMSGFILTER, code, 0, (LPARAM)msg )) return TRUE;
 367     return HOOK_CallHooks( WH_MSGFILTER, code, 0, (LPARAM)msg );
 368 }
 369
 370
 371 /***********************************************************************
 372  *           SetWindowsHookEx16   (USER.291)
 373  */
 374 HHOOK SetWindowsHookEx16( INT16 id, HOOKPROC16 proc, HINSTANCE16 hInst,
 375                           HTASK16 hTask )
 376 {
 377     HANDLE16 handle = HOOK_SetHook( id, proc, hInst, hTask );
 378     return (handle) ? MAKELONG( handle, HOOK_MAGIC ) : NULL;
 379 }
 380
 381
 382 /***********************************************************************
 383  *           UnhookWindowHookEx16   (USER.292)
 384  */
 385 BOOL16 UnhookWindowsHookEx16( HHOOK hhook )
 386 {
 387     if (HIWORD(hhook) != HOOK_MAGIC) return FALSE;  /* Not a new format hook */
 388     return HOOK_RemoveHook( LOWORD(hhook) );
 389 }
 390
 391
 392 /***********************************************************************
 393  *           CallNextHookEx   (USER.293)
 394  */
 395 LRESULT CallNextHookEx(HHOOK hhook, INT16 code, WPARAM16 wParam, LPARAM lParam)
 396 {
 397     HANDLE16 next;
 398     if (HIWORD(hhook) != HOOK_MAGIC) return 0;  /* Not a new format hook */
 399     if (!(next = HOOK_GetNextHook( LOWORD(hhook) ))) return 0;
 400     return HOOK_CallHook( next, code, wParam, lParam );
 401 }