dlls/kernel32/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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, 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 "winioctl.h"
  42 #include "kernel_private.h"
  43 #include "wine/library.h"
  44 #include "wine/unicode.h"
  45 #include "wine/server.h"
  46 #include "wine/debug.h"
  47
  48 WINE_DEFAULT_DEBUG_CHANNEL(vxd);
  49
  50 typedef BOOL (WINAPI *DeviceIoProc)(DWORD, LPVOID, DWORD, LPVOID, DWORD, LPDWORD, LPOVERLAPPED);
  51 typedef DWORD (WINAPI *VxDCallProc)(DWORD, CONTEXT86 *);
  52
  53 struct vxd_module
  54 {
  55     LARGE_INTEGER index;
  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, { (DWORD_PTR)(__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     DeviceIoProc ret = NULL;
 137     int status, i;
 138     IO_STATUS_BLOCK io;
 139     FILE_INTERNAL_INFORMATION info;
 140
 141     status = NtQueryInformationFile( handle, &io, &info, sizeof(info), FileInternalInformation );
 142     if (status)
 143     {
 144         SetLastError( RtlNtStatusToDosError(status) );
 145         return NULL;
 146     }
 147
 148     RtlEnterCriticalSection( &vxd_section );
 149
 150     for (i = 0; i < MAX_VXD_MODULES; i++)
 151     {
 152         if (!vxd_modules[i].module) break;
 153         if (vxd_modules[i].index.QuadPart == info.IndexNumber.QuadPart)
 154         {
 155             if (!(ret = vxd_modules[i].proc)) SetLastError( ERROR_INVALID_FUNCTION );
 156             goto done;
 157         }
 158     }
 159     /* FIXME: Here we could go through the directory to find the VxD name and load it. */
 160     /* Let's wait to find out if there are actually apps out there that try to share   */
 161     /* VxD handles between processes, before we go to the trouble of implementing it.  */
 162     ERR( "handle %p not found in module list, inherited from another process?\n", handle );
 163
 164 done:
 165     RtlLeaveCriticalSection( &vxd_section );
 166     return ret;
 167 }
 168
 169
 170 /* load a VxD and return a file handle to it */
 171 HANDLE VXD_Open( LPCWSTR filenameW, DWORD access, SECURITY_ATTRIBUTES *sa )
 172 {
 173     static const WCHAR dotVxDW[] = {'.','v','x','d',0};
 174     int i;
 175     HANDLE handle;
 176     HMODULE module;
 177     WCHAR *p, name[16];
 178
 179     if (!(GetVersion() & 0x80000000))  /* there are no VxDs on NT */
 180     {
 181         SetLastError( ERROR_FILE_NOT_FOUND );
 182         return 0;
 183     }
 184
 185     /* normalize the filename */
 186
 187     if (strlenW( filenameW ) >= sizeof(name)/sizeof(WCHAR) - 4 ||
 188         strchrW( filenameW, '/' ) || strchrW( filenameW, '\\' ))
 189     {
 190         SetLastError( ERROR_FILE_NOT_FOUND );
 191         return 0;
 192     }
 193     strcpyW( name, filenameW );
 194     strlwrW( name );
 195     p = strchrW( name, '.' );
 196     if (!p) strcatW( name, dotVxDW );
 197     else if (strcmpiW( p, dotVxDW ))  /* existing extension has to be .vxd */
 198     {
 199         SetLastError( ERROR_FILE_NOT_FOUND );
 200         return 0;
 201     }
 202
 203     /* try to load the module first */
 204
 205     if (!(module = LoadLibraryW( name )))
 206     {
 207         FIXME( "Unknown/unsupported VxD %s. Try setting Windows version to 'nt40' or 'win31'.\n",
 208                debugstr_w(name) );
 209         SetLastError( ERROR_FILE_NOT_FOUND );
 210         return 0;
 211     }
 212
 213     /* register the module in the global list if necessary */
 214
 215     RtlEnterCriticalSection( &vxd_section );
 216
 217     for (i = 0; i < MAX_VXD_MODULES; i++)
 218     {
 219         if (vxd_modules[i].module == module)
 220         {
 221             handle = vxd_modules[i].handle;
 222             goto done;  /* already registered */
 223         }
 224         if (!vxd_modules[i].module)  /* new one, register it */
 225         {
 226             IO_STATUS_BLOCK io;
 227             FILE_INTERNAL_INFORMATION info;
 228
 229             /* get a file handle to the dummy file */
 230             if (!(handle = open_vxd_handle( name )))
 231             {
 232                 FreeLibrary( module );
 233                 goto done;
 234             }
 235             if (!NtQueryInformationFile( handle, &io, &info, sizeof(info), FileInternalInformation ))
 236                 vxd_modules[i].index = info.IndexNumber;
 237
 238             vxd_modules[i].module = module;
 239             vxd_modules[i].handle = handle;
 240             vxd_modules[i].proc = (DeviceIoProc)GetProcAddress( module, "DeviceIoControl" );
 241             goto done;
 242         }
 243     }
 244
 245     ERR("too many open VxD modules, please report\n" );
 246     FreeLibrary( module );
 247     handle = 0;
 248
 249 done:
 250     RtlLeaveCriticalSection( &vxd_section );
 251     if (!DuplicateHandle( GetCurrentProcess(), handle, GetCurrentProcess(), &handle, 0,
 252                           (sa && (sa->nLength>=sizeof(*sa)) && sa->bInheritHandle),
 253                           DUP_HANDLE_SAME_ACCESS ))
 254         handle = 0;
 255     return handle;
 256 }
 257
 258
 259 /***********************************************************************
 260  *              VxDCall0 (KERNEL32.1)
 261  *              VxDCall1 (KERNEL32.2)
 262  *              VxDCall2 (KERNEL32.3)
 263  *              VxDCall3 (KERNEL32.4)
 264  *              VxDCall4 (KERNEL32.5)
 265  *              VxDCall5 (KERNEL32.6)
 266  *              VxDCall6 (KERNEL32.7)
 267  *              VxDCall7 (KERNEL32.8)
 268  *              VxDCall8 (KERNEL32.9)
 269  */
 270 void WINAPI __regs_VxDCall( DWORD service, CONTEXT86 *context )
 271 {
 272     int i;
 273     VxDCallProc proc = NULL;
 274
 275     RtlEnterCriticalSection( &vxd_section );
 276     for (i = 0; i < NB_VXD_SERVICES; i++)
 277     {
 278         if (HIWORD(service) != vxd_services[i].service) continue;
 279         if (!vxd_services[i].module)  /* need to load it */
 280         {
 281             if ((vxd_services[i].module = LoadLibraryW( vxd_services[i].name )))
 282                 vxd_services[i].proc = (VxDCallProc)GetProcAddress( vxd_services[i].module, "VxDCall" );
 283         }
 284         proc = vxd_services[i].proc;
 285         break;
 286     }
 287     RtlLeaveCriticalSection( &vxd_section );
 288
 289     if (proc) context->Eax = proc( service, context );
 290     else
 291     {
 292         FIXME( "Unknown/unimplemented VxD (%08x)\n", service);
 293         context->Eax = 0xffffffff; /* FIXME */
 294     }
 295 }
 296 #ifdef DEFINE_REGS_ENTRYPOINT
 297 DEFINE_REGS_ENTRYPOINT( VxDCall, 4, 4 )
 298 #endif
 299
 300
 301 /***********************************************************************
 302  *              OpenVxDHandle (KERNEL32.@)
 303  *
 304  *      This function is supposed to return the corresponding Ring 0
 305  *      ("kernel") handle for a Ring 3 handle in Win9x.
 306  *      Evidently, Wine will have problems with this. But we try anyway,
 307  *      maybe it helps...
 308  */
 309 HANDLE WINAPI OpenVxDHandle(HANDLE hHandleRing3)
 310 {
 311     FIXME( "(%p), stub! (returning Ring 3 handle instead of Ring 0)\n", hHandleRing3);
 312     return hHandleRing3;
 313 }
 314
 315
 316 /****************************************************************************
 317  *              DeviceIoControl (KERNEL32.@)
 318  * This is one of those big ugly nasty procedure which can do
 319  * a million and one things when it comes to devices. It can also be
 320  * used for VxD communication.
 321  *
 322  * A return value of FALSE indicates that something has gone wrong which
 323  * GetLastError can decipher.
 324  */
 325 BOOL WINAPI DeviceIoControl(HANDLE hDevice, DWORD dwIoControlCode,
 326                             LPVOID lpvInBuffer, DWORD cbInBuffer,
 327                             LPVOID lpvOutBuffer, DWORD cbOutBuffer,
 328                             LPDWORD lpcbBytesReturned,
 329                             LPOVERLAPPED lpOverlapped)
 330 {
 331     NTSTATUS status;
 332
 333     TRACE( "(%p,%x,%p,%d,%p,%d,%p,%p)\n",
 334            hDevice,dwIoControlCode,lpvInBuffer,cbInBuffer,
 335            lpvOutBuffer,cbOutBuffer,lpcbBytesReturned,lpOverlapped );
 336
 337     /* Check if this is a user defined control code for a VxD */
 338
 339     if( HIWORD( dwIoControlCode ) == 0 )
 340     {
 341         DeviceIoProc proc = get_vxd_proc( hDevice );
 342         if (proc) return proc( dwIoControlCode, lpvInBuffer, cbInBuffer,
 343                                lpvOutBuffer, cbOutBuffer, lpcbBytesReturned, lpOverlapped );
 344         return FALSE;
 345     }
 346
 347     /* Not a VxD, let ntdll handle it */
 348
 349     if (lpOverlapped)
 350     {
 351         if (HIWORD(dwIoControlCode) == FILE_DEVICE_FILE_SYSTEM)
 352             status = NtFsControlFile(hDevice, lpOverlapped->hEvent,
 353                                      NULL, NULL, (PIO_STATUS_BLOCK)lpOverlapped,
 354                                      dwIoControlCode, lpvInBuffer, cbInBuffer,
 355                                      lpvOutBuffer, cbOutBuffer);
 356         else
 357             status = NtDeviceIoControlFile(hDevice, lpOverlapped->hEvent,
 358                                            NULL, NULL, (PIO_STATUS_BLOCK)lpOverlapped,
 359                                            dwIoControlCode, lpvInBuffer, cbInBuffer,
 360                                            lpvOutBuffer, cbOutBuffer);
 361         if (lpcbBytesReturned) *lpcbBytesReturned = lpOverlapped->InternalHigh;
 362     }
 363     else
 364     {
 365         IO_STATUS_BLOCK iosb;
 366
 367         if (HIWORD(dwIoControlCode) == FILE_DEVICE_FILE_SYSTEM)
 368             status = NtFsControlFile(hDevice, NULL, NULL, NULL, &iosb,
 369                                      dwIoControlCode, lpvInBuffer, cbInBuffer,
 370                                      lpvOutBuffer, cbOutBuffer);
 371         else
 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 }