dlls/kernel/vxd.c

   1 /*
   2  * Win32 VxD functions
   3  *
   4  * Copyright 1998 Marcus Meissner
   5  * Copyright 1998 Ulrich Weigand
   6  * Copyright 1998 Patrik Stridvall
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 #include "config.h"
  24 #include "wine/port.h"
  25
  26 #include <stdlib.h>
  27 #ifdef HAVE_UNISTD_H
  28 # include <unistd.h>
  29 #endif
  30 #include <sys/types.h>
  31 #ifdef HAVE_SYS_STAT_H
  32 # include <sys/stat.h>
  33 #endif
  34 #include <string.h>
  35 #include <stdarg.h>
  36
  37 #include "windef.h"
  38 #include "winbase.h"
  39 #include "winerror.h"
  40 #include "winternl.h"
  41 #include "kernel_private.h"
  42 #include "wine/library.h"
  43 #include "wine/unicode.h"
  44 #include "wine/server.h"
  45 #include "wine/debug.h"
  46
  47 WINE_DEFAULT_DEBUG_CHANNEL(vxd);
  48
  49 typedef BOOL (WINAPI *DeviceIoProc)(DWORD, LPVOID, DWORD, LPVOID, DWORD, LPDWORD, LPOVERLAPPED);
  50 typedef DWORD (WINAPI *VxDCallProc)(DWORD, CONTEXT86 *);
  51
  52 struct vxd_module
  53 {
  54     dev_t        dev;
  55     ino_t        ino;
  56     HANDLE       handle;
  57     HMODULE      module;
  58     DeviceIoProc proc;
  59 };
  60
  61 struct vxdcall_service
  62 {
  63     WCHAR       name[12];
  64     DWORD       service;
  65     HMODULE     module;
  66     VxDCallProc proc;
  67 };
  68
  69 #define MAX_VXD_MODULES 32
  70
  71 static struct vxd_module vxd_modules[MAX_VXD_MODULES];
  72
  73 static struct vxdcall_service vxd_services[] =
  74 {
  75     { {'v','m','m','.','v','x','d',0},             0x0001, NULL, NULL },
  76     { {'v','w','i','n','3','2','.','v','x','d',0}, 0x002a, NULL, NULL }
  77 };
  78
  79 #define NB_VXD_SERVICES  (sizeof(vxd_services)/sizeof(vxd_services[0]))
  80
  81 static CRITICAL_SECTION vxd_section;
  82 static CRITICAL_SECTION_DEBUG critsect_debug =
  83 {
  84     0, 0, &vxd_section,
  85     { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
  86       0, 0, { 0, (DWORD)(__FILE__ ": vxd_section") }
  87 };
  88 static CRITICAL_SECTION vxd_section = { &critsect_debug, -1, 0, 0, 0, 0 };
  89
  90
  91 /* create a file handle to represent a VxD, by opening a dummy file in the wineserver directory */
  92 static HANDLE open_vxd_handle( LPCWSTR name )
  93 {
  94     const char *dir = wine_get_server_dir();
  95     int len;
  96     HANDLE ret;
  97     NTSTATUS status;
  98     OBJECT_ATTRIBUTES attr;
  99     UNICODE_STRING nameW;
 100     IO_STATUS_BLOCK io;
 101
 102     len = MultiByteToWideChar( CP_UNIXCP, 0, dir, -1, NULL, 0 );
 103     nameW.Length = (len + 1 + strlenW( name )) * sizeof(WCHAR);
 104     nameW.MaximumLength = nameW.Length + sizeof(WCHAR);
 105     if (!(nameW.Buffer = HeapAlloc( GetProcessHeap(), 0, nameW.Length )))
 106     {
 107         SetLastError( ERROR_NOT_ENOUGH_MEMORY );
 108         return 0;
 109     }
 110     MultiByteToWideChar( CP_UNIXCP, 0, dir, -1, nameW.Buffer, len );
 111     nameW.Buffer[len-1] = '/';
 112     strcpyW( nameW.Buffer + len, name );
 113
 114     attr.Length = sizeof(attr);
 115     attr.RootDirectory = 0;
 116     attr.Attributes = 0;
 117     attr.ObjectName = &nameW;
 118     attr.SecurityDescriptor = NULL;
 119     attr.SecurityQualityOfService = NULL;
 120
 121     status = NtCreateFile( &ret, 0, &attr, &io, NULL, 0,
 122                            FILE_SHARE_READ|FILE_SHARE_WRITE, FILE_OPEN_IF,
 123                            FILE_SYNCHRONOUS_IO_ALERT, NULL, 0 );
 124     if (status)
 125     {
 126         ret = 0;
 127         SetLastError( RtlNtStatusToDosError(status) );
 128     }
 129     RtlFreeUnicodeString( &nameW );
 130     return ret;
 131 }
 132
 133 /* retrieve the DeviceIoControl function for a Vxd given a file handle */
 134 static DeviceIoProc get_vxd_proc( HANDLE handle )
 135 {
 136     struct stat st;
 137     DeviceIoProc ret = NULL;
 138     int status, i, fd;
 139
 140     status = wine_server_handle_to_fd( handle, 0, &fd, NULL );
 141     if (status)
 142     {
 143         SetLastError( RtlNtStatusToDosError(status) );
 144         return NULL;
 145     }
 146     if (fstat( fd, &st ) == -1)
 147     {
 148         wine_server_release_fd( handle, fd );
 149         SetLastError( ERROR_INVALID_HANDLE );
 150         return NULL;
 151     }
 152     wine_server_release_fd( handle, fd );
 153
 154     RtlEnterCriticalSection( &vxd_section );
 155
 156     for (i = 0; i < MAX_VXD_MODULES; i++)
 157     {
 158         if (!vxd_modules[i].module) break;
 159         if (vxd_modules[i].dev == st.st_dev && vxd_modules[i].ino == st.st_ino)
 160         {
 161             if (!(ret = vxd_modules[i].proc)) SetLastError( ERROR_INVALID_FUNCTION );
 162             goto done;
 163         }
 164     }
 165     /* FIXME: Here we could go through the directory to find the VxD name and load it. */
 166     /* Let's wait to find out if there are actually apps out there that try to share   */
 167     /* VxD handles between processes, before we go to the trouble of implementing it.  */
 168     ERR( "handle %p not found in module list, inherited from another process?\n", handle );
 169
 170 done:
 171     RtlLeaveCriticalSection( &vxd_section );
 172     return ret;
 173 }
 174
 175
 176 /* load a VxD and return a file handle to it */
 177 HANDLE VXD_Open( LPCWSTR filenameW, DWORD access, SECURITY_ATTRIBUTES *sa )
 178 {
 179     static const WCHAR dotVxDW[] = {'.','v','x','d',0};
 180     int i;
 181     HANDLE handle;
 182     HMODULE module;
 183     WCHAR *p, name[16];
 184
 185     if (!(GetVersion() & 0x80000000))  /* there are no VxDs on NT */
 186     {
 187         SetLastError( ERROR_FILE_NOT_FOUND );
 188         return 0;
 189     }
 190
 191     /* normalize the filename */
 192
 193     if (strlenW( filenameW ) >= sizeof(name)/sizeof(WCHAR) - 4 ||
 194         strchrW( filenameW, '/' ) || strchrW( filenameW, '\\' ))
 195     {
 196         SetLastError( ERROR_FILE_NOT_FOUND );
 197         return 0;
 198     }
 199     strcpyW( name, filenameW );
 200     strlwrW( name );
 201     p = strchrW( name, '.' );
 202     if (!p) strcatW( name, dotVxDW );
 203     else if (strcmpW( p, dotVxDW ))  /* existing extension has to be .vxd */
 204     {
 205         SetLastError( ERROR_FILE_NOT_FOUND );
 206         return 0;
 207     }
 208
 209     /* try to load the module first */
 210
 211     if (!(module = LoadLibraryW( name )))
 212     {
 213         FIXME( "Unknown/unsupported VxD %s. Try setting Windows version to 'nt40' or 'win31'.\n",
 214                debugstr_w(name) );
 215         SetLastError( ERROR_FILE_NOT_FOUND );
 216         return 0;
 217     }
 218
 219     /* register the module in the global list if necessary */
 220
 221     RtlEnterCriticalSection( &vxd_section );
 222
 223     for (i = 0; i < MAX_VXD_MODULES; i++)
 224     {
 225         if (vxd_modules[i].module == module)
 226         {
 227             handle = vxd_modules[i].handle;
 228             goto done;  /* already registered */
 229         }
 230         if (!vxd_modules[i].module)  /* new one, register it */
 231         {
 232             struct stat st;
 233             int fd;
 234
 235             /* get a file handle to the dummy file */
 236             if (!(handle = open_vxd_handle( name )))
 237             {
 238                 FreeLibrary( module );
 239                 goto done;
 240             }
 241             wine_server_handle_to_fd( handle, 0, &fd, NULL );
 242             if (fstat( fd, &st ) != -1)
 243             {
 244                 vxd_modules[i].dev = st.st_dev;
 245                 vxd_modules[i].ino = st.st_ino;
 246             }
 247             vxd_modules[i].module = module;
 248             vxd_modules[i].handle = handle;
 249             vxd_modules[i].proc = (DeviceIoProc)GetProcAddress( module, "DeviceIoControl" );
 250             wine_server_release_fd( handle, fd );
 251             goto done;
 252         }
 253     }
 254
 255     ERR("too many open VxD modules, please report\n" );
 256     CloseHandle( handle );
 257     FreeLibrary( module );
 258     handle = 0;
 259
 260 done:
 261     RtlLeaveCriticalSection( &vxd_section );
 262     if (!DuplicateHandle( GetCurrentProcess(), handle, GetCurrentProcess(), &handle, 0,
 263                           (sa && (sa->nLength>=sizeof(*sa)) && sa->bInheritHandle),
 264                           DUP_HANDLE_SAME_ACCESS ))
 265         handle = 0;
 266     return handle;
 267 }
 268
 269
 270 /***********************************************************************
 271  *              VxDCall0 (KERNEL32.1)
 272  *              VxDCall1 (KERNEL32.2)
 273  *              VxDCall2 (KERNEL32.3)
 274  *              VxDCall3 (KERNEL32.4)
 275  *              VxDCall4 (KERNEL32.5)
 276  *              VxDCall5 (KERNEL32.6)
 277  *              VxDCall6 (KERNEL32.7)
 278  *              VxDCall7 (KERNEL32.8)
 279  *              VxDCall8 (KERNEL32.9)
 280  */
 281 void WINAPI __regs_VxDCall( DWORD service, CONTEXT86 *context )
 282 {
 283     int i;
 284     VxDCallProc proc = NULL;
 285
 286     RtlEnterCriticalSection( &vxd_section );
 287     for (i = 0; i < NB_VXD_SERVICES; i++)
 288     {
 289         if (HIWORD(service) != vxd_services[i].service) continue;
 290         if (!vxd_services[i].module)  /* need to load it */
 291         {
 292             if ((vxd_services[i].module = LoadLibraryW( vxd_services[i].name )))
 293                 vxd_services[i].proc = (VxDCallProc)GetProcAddress( vxd_services[i].module, "VxDCall" );
 294         }
 295         proc = vxd_services[i].proc;
 296         break;
 297     }
 298     RtlLeaveCriticalSection( &vxd_section );
 299
 300     if (proc) context->Eax = proc( service, context );
 301     else
 302     {
 303         FIXME( "Unknown/unimplemented VxD (%08lx)\n", service);
 304         context->Eax = 0xffffffff; /* FIXME */
 305     }
 306 }
 307 #ifdef DEFINE_REGS_ENTRYPOINT
 308 DEFINE_REGS_ENTRYPOINT( VxDCall, 4, 4 );
 309 #endif
 310
 311
 312 /***********************************************************************
 313  *              OpenVxDHandle (KERNEL32.@)
 314  *
 315  *      This function is supposed to return the corresponding Ring 0
 316  *      ("kernel") handle for a Ring 3 handle in Win9x.
 317  *      Evidently, Wine will have problems with this. But we try anyway,
 318  *      maybe it helps...
 319  */
 320 HANDLE WINAPI OpenVxDHandle(HANDLE hHandleRing3)
 321 {
 322     FIXME( "(%p), stub! (returning Ring 3 handle instead of Ring 0)\n", hHandleRing3);
 323     return hHandleRing3;
 324 }
 325
 326
 327 /****************************************************************************
 328  *              DeviceIoControl (KERNEL32.@)
 329  * This is one of those big ugly nasty procedure which can do
 330  * a million and one things when it comes to devices. It can also be
 331  * used for VxD communication.
 332  *
 333  * A return value of FALSE indicates that something has gone wrong which
 334  * GetLastError can decipher.
 335  */
 336 BOOL WINAPI DeviceIoControl(HANDLE hDevice, DWORD dwIoControlCode,
 337                             LPVOID lpvInBuffer, DWORD cbInBuffer,
 338                             LPVOID lpvOutBuffer, DWORD cbOutBuffer,
 339                             LPDWORD lpcbBytesReturned,
 340                             LPOVERLAPPED lpOverlapped)
 341 {
 342     NTSTATUS status;
 343
 344     TRACE( "(%p,%lx,%p,%ld,%p,%ld,%p,%p)\n",
 345            hDevice,dwIoControlCode,lpvInBuffer,cbInBuffer,
 346            lpvOutBuffer,cbOutBuffer,lpcbBytesReturned,lpOverlapped );
 347
 348     /* Check if this is a user defined control code for a VxD */
 349
 350     if( HIWORD( dwIoControlCode ) == 0 )
 351     {
 352         DeviceIoProc proc = get_vxd_proc( hDevice );
 353         if (proc) return proc( dwIoControlCode, lpvInBuffer, cbInBuffer,
 354                                lpvOutBuffer, cbOutBuffer, lpcbBytesReturned, lpOverlapped );
 355         return FALSE;
 356     }
 357
 358     /* Not a VxD, let ntdll handle it */
 359
 360     if (lpOverlapped)
 361     {
 362         status = NtDeviceIoControlFile(hDevice, lpOverlapped->hEvent,
 363                                        NULL, NULL, (PIO_STATUS_BLOCK)lpOverlapped,
 364                                        dwIoControlCode, lpvInBuffer, cbInBuffer,
 365                                        lpvOutBuffer, cbOutBuffer);
 366         if (lpcbBytesReturned) *lpcbBytesReturned = lpOverlapped->InternalHigh;
 367     }
 368     else
 369     {
 370         IO_STATUS_BLOCK iosb;
 371
 372         status = NtDeviceIoControlFile(hDevice, NULL, NULL, NULL, &iosb,
 373                                        dwIoControlCode, lpvInBuffer, cbInBuffer,
 374                                        lpvOutBuffer, cbOutBuffer);
 375         if (lpcbBytesReturned) *lpcbBytesReturned = iosb.Information;
 376     }
 377     if (status) SetLastError( RtlNtStatusToDosError(status) );
 378     return !status;
 379 }