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     static const WCHAR prefixW[] = {'\\','?','?','\\','u','n','i','x'};
  95     const char *dir = wine_get_server_dir();
  96     int len;
  97     HANDLE ret;
  98     NTSTATUS status;
  99     OBJECT_ATTRIBUTES attr;
 100     UNICODE_STRING nameW;
 101     IO_STATUS_BLOCK io;
 102
 103     len = MultiByteToWideChar( CP_UNIXCP, 0, dir, -1, NULL, 0 );
 104     nameW.Length = sizeof(prefixW) + (len + strlenW( name )) * sizeof(WCHAR);
 105     nameW.MaximumLength = nameW.Length + sizeof(WCHAR);
 106     if (!(nameW.Buffer = HeapAlloc( GetProcessHeap(), 0, nameW.MaximumLength )))
 107     {
 108         SetLastError( ERROR_NOT_ENOUGH_MEMORY );
 109         return 0;
 110     }
 111     memcpy( nameW.Buffer, prefixW, sizeof(prefixW) );
 112     MultiByteToWideChar( CP_UNIXCP, 0, dir, -1, nameW.Buffer + sizeof(prefixW)/sizeof(WCHAR), len );
 113     len += sizeof(prefixW) / sizeof(WCHAR);
 114     nameW.Buffer[len-1] = '/';
 115     strcpyW( nameW.Buffer + len, name );
 116
 117     attr.Length = sizeof(attr);
 118     attr.RootDirectory = 0;
 119     attr.Attributes = 0;
 120     attr.ObjectName = &nameW;
 121     attr.SecurityDescriptor = NULL;
 122     attr.SecurityQualityOfService = NULL;
 123
 124     status = NtCreateFile( &ret, 0, &attr, &io, NULL, 0,
 125                            FILE_SHARE_READ|FILE_SHARE_WRITE, FILE_OPEN_IF,
 126                            FILE_SYNCHRONOUS_IO_ALERT, NULL, 0 );
 127     if (status)
 128     {
 129         ret = 0;
 130         SetLastError( RtlNtStatusToDosError(status) );
 131     }
 132     RtlFreeUnicodeString( &nameW );
 133     return ret;
 134 }
 135
 136 /* retrieve the DeviceIoControl function for a Vxd given a file handle */
 137 static DeviceIoProc get_vxd_proc( HANDLE handle )
 138 {
 139     DeviceIoProc ret = NULL;
 140     int status, i;
 141     IO_STATUS_BLOCK io;
 142     FILE_INTERNAL_INFORMATION info;
 143
 144     status = NtQueryInformationFile( handle, &io, &info, sizeof(info), FileInternalInformation );
 145     if (status)
 146     {
 147         SetLastError( RtlNtStatusToDosError(status) );
 148         return NULL;
 149     }
 150
 151     RtlEnterCriticalSection( &vxd_section );
 152
 153     for (i = 0; i < MAX_VXD_MODULES; i++)
 154     {
 155         if (!vxd_modules[i].module) break;
 156         if (vxd_modules[i].index.QuadPart == info.IndexNumber.QuadPart)
 157         {
 158             if (!(ret = vxd_modules[i].proc)) SetLastError( ERROR_INVALID_FUNCTION );
 159             goto done;
 160         }
 161     }
 162     /* FIXME: Here we could go through the directory to find the VxD name and load it. */
 163     /* Let's wait to find out if there are actually apps out there that try to share   */
 164     /* VxD handles between processes, before we go to the trouble of implementing it.  */
 165     ERR( "handle %p not found in module list, inherited from another process?\n", handle );
 166
 167 done:
 168     RtlLeaveCriticalSection( &vxd_section );
 169     return ret;
 170 }
 171
 172
 173 /* load a VxD and return a file handle to it */
 174 HANDLE VXD_Open( LPCWSTR filenameW, DWORD access, SECURITY_ATTRIBUTES *sa )
 175 {
 176     static const WCHAR dotVxDW[] = {'.','v','x','d',0};
 177     int i;
 178     HANDLE handle;
 179     HMODULE module;
 180     WCHAR *p, name[16];
 181
 182     if (!(GetVersion() & 0x80000000))  /* there are no VxDs on NT */
 183     {
 184         SetLastError( ERROR_FILE_NOT_FOUND );
 185         return 0;
 186     }
 187
 188     /* normalize the filename */
 189
 190     if (strlenW( filenameW ) >= sizeof(name)/sizeof(WCHAR) - 4 ||
 191         strchrW( filenameW, '/' ) || strchrW( filenameW, '\\' ))
 192     {
 193         SetLastError( ERROR_FILE_NOT_FOUND );
 194         return 0;
 195     }
 196     strcpyW( name, filenameW );
 197     strlwrW( name );
 198     p = strchrW( name, '.' );
 199     if (!p) strcatW( name, dotVxDW );
 200     else if (strcmpiW( p, dotVxDW ))  /* existing extension has to be .vxd */
 201     {
 202         SetLastError( ERROR_FILE_NOT_FOUND );
 203         return 0;
 204     }
 205
 206     /* try to load the module first */
 207
 208     if (!(module = LoadLibraryW( name )))
 209     {
 210         FIXME( "Unknown/unsupported VxD %s. Try setting Windows version to 'nt40' or 'win31'.\n",
 211                debugstr_w(name) );
 212         SetLastError( ERROR_FILE_NOT_FOUND );
 213         return 0;
 214     }
 215
 216     /* register the module in the global list if necessary */
 217
 218     RtlEnterCriticalSection( &vxd_section );
 219
 220     for (i = 0; i < MAX_VXD_MODULES; i++)
 221     {
 222         if (vxd_modules[i].module == module)
 223         {
 224             handle = vxd_modules[i].handle;
 225             goto done;  /* already registered */
 226         }
 227         if (!vxd_modules[i].module)  /* new one, register it */
 228         {
 229             IO_STATUS_BLOCK io;
 230             FILE_INTERNAL_INFORMATION info;
 231
 232             /* get a file handle to the dummy file */
 233             if (!(handle = open_vxd_handle( name )))
 234             {
 235                 FreeLibrary( module );
 236                 goto done;
 237             }
 238             if (!NtQueryInformationFile( handle, &io, &info, sizeof(info), FileInternalInformation ))
 239                 vxd_modules[i].index = info.IndexNumber;
 240
 241             vxd_modules[i].module = module;
 242             vxd_modules[i].handle = handle;
 243             vxd_modules[i].proc = (DeviceIoProc)GetProcAddress( module, "DeviceIoControl" );
 244             goto done;
 245         }
 246     }
 247
 248     ERR("too many open VxD modules, please report\n" );
 249     FreeLibrary( module );
 250     handle = 0;
 251
 252 done:
 253     RtlLeaveCriticalSection( &vxd_section );
 254     if (!DuplicateHandle( GetCurrentProcess(), handle, GetCurrentProcess(), &handle, 0,
 255                           (sa && (sa->nLength>=sizeof(*sa)) && sa->bInheritHandle),
 256                           DUP_HANDLE_SAME_ACCESS ))
 257         handle = 0;
 258     return handle;
 259 }
 260
 261
 262 /***********************************************************************
 263  *              VxDCall0 (KERNEL32.1)
 264  *              VxDCall1 (KERNEL32.2)
 265  *              VxDCall2 (KERNEL32.3)
 266  *              VxDCall3 (KERNEL32.4)
 267  *              VxDCall4 (KERNEL32.5)
 268  *              VxDCall5 (KERNEL32.6)
 269  *              VxDCall6 (KERNEL32.7)
 270  *              VxDCall7 (KERNEL32.8)
 271  *              VxDCall8 (KERNEL32.9)
 272  */
 273 void WINAPI __regs_VxDCall( DWORD service, CONTEXT86 *context )
 274 {
 275     int i;
 276     VxDCallProc proc = NULL;
 277
 278     RtlEnterCriticalSection( &vxd_section );
 279     for (i = 0; i < NB_VXD_SERVICES; i++)
 280     {
 281         if (HIWORD(service) != vxd_services[i].service) continue;
 282         if (!vxd_services[i].module)  /* need to load it */
 283         {
 284             if ((vxd_services[i].module = LoadLibraryW( vxd_services[i].name )))
 285                 vxd_services[i].proc = (VxDCallProc)GetProcAddress( vxd_services[i].module, "VxDCall" );
 286         }
 287         proc = vxd_services[i].proc;
 288         break;
 289     }
 290     RtlLeaveCriticalSection( &vxd_section );
 291
 292     if (proc) context->Eax = proc( service, context );
 293     else
 294     {
 295         FIXME( "Unknown/unimplemented VxD (%08x)\n", service);
 296         context->Eax = 0xffffffff; /* FIXME */
 297     }
 298 }
 299 #ifdef DEFINE_REGS_ENTRYPOINT
 300 DEFINE_REGS_ENTRYPOINT( VxDCall, 4, 4 )
 301 #endif
 302
 303
 304 /***********************************************************************
 305  *              OpenVxDHandle (KERNEL32.@)
 306  *
 307  *      This function is supposed to return the corresponding Ring 0
 308  *      ("kernel") handle for a Ring 3 handle in Win9x.
 309  *      Evidently, Wine will have problems with this. But we try anyway,
 310  *      maybe it helps...
 311  */
 312 HANDLE WINAPI OpenVxDHandle(HANDLE hHandleRing3)
 313 {
 314     FIXME( "(%p), stub! (returning Ring 3 handle instead of Ring 0)\n", hHandleRing3);
 315     return hHandleRing3;
 316 }
 317
 318
 319 /****************************************************************************
 320  *              DeviceIoControl (KERNEL32.@)
 321  * This is one of those big ugly nasty procedure which can do
 322  * a million and one things when it comes to devices. It can also be
 323  * used for VxD communication.
 324  *
 325  * A return value of FALSE indicates that something has gone wrong which
 326  * GetLastError can decipher.
 327  */
 328 BOOL WINAPI DeviceIoControl(HANDLE hDevice, DWORD dwIoControlCode,
 329                             LPVOID lpvInBuffer, DWORD cbInBuffer,
 330                             LPVOID lpvOutBuffer, DWORD cbOutBuffer,
 331                             LPDWORD lpcbBytesReturned,
 332                             LPOVERLAPPED lpOverlapped)
 333 {
 334     NTSTATUS status;
 335
 336     TRACE( "(%p,%x,%p,%d,%p,%d,%p,%p)\n",
 337            hDevice,dwIoControlCode,lpvInBuffer,cbInBuffer,
 338            lpvOutBuffer,cbOutBuffer,lpcbBytesReturned,lpOverlapped );
 339
 340     /* Check if this is a user defined control code for a VxD */
 341
 342     if( HIWORD( dwIoControlCode ) == 0 )
 343     {
 344         DeviceIoProc proc = get_vxd_proc( hDevice );
 345         if (proc) return proc( dwIoControlCode, lpvInBuffer, cbInBuffer,
 346                                lpvOutBuffer, cbOutBuffer, lpcbBytesReturned, lpOverlapped );
 347         return FALSE;
 348     }
 349
 350     /* Not a VxD, let ntdll handle it */
 351
 352     if (lpOverlapped)
 353     {
 354         LPVOID cvalue = ((ULONG_PTR)lpOverlapped->hEvent & 1) ? NULL : lpOverlapped;
 355         lpOverlapped->Internal = STATUS_PENDING;
 356         lpOverlapped->InternalHigh = 0;
 357         if (HIWORD(dwIoControlCode) == FILE_DEVICE_FILE_SYSTEM)
 358             status = NtFsControlFile(hDevice, lpOverlapped->hEvent,
 359                                      NULL, cvalue, (PIO_STATUS_BLOCK)lpOverlapped,
 360                                      dwIoControlCode, lpvInBuffer, cbInBuffer,
 361                                      lpvOutBuffer, cbOutBuffer);
 362         else
 363             status = NtDeviceIoControlFile(hDevice, lpOverlapped->hEvent,
 364                                            NULL, cvalue, (PIO_STATUS_BLOCK)lpOverlapped,
 365                                            dwIoControlCode, lpvInBuffer, cbInBuffer,
 366                                            lpvOutBuffer, cbOutBuffer);
 367         if (lpcbBytesReturned) *lpcbBytesReturned = lpOverlapped->InternalHigh;
 368     }
 369     else
 370     {
 371         IO_STATUS_BLOCK iosb;
 372
 373         if (HIWORD(dwIoControlCode) == FILE_DEVICE_FILE_SYSTEM)
 374             status = NtFsControlFile(hDevice, NULL, NULL, NULL, &iosb,
 375                                      dwIoControlCode, lpvInBuffer, cbInBuffer,
 376                                      lpvOutBuffer, cbOutBuffer);
 377         else
 378             status = NtDeviceIoControlFile(hDevice, NULL, NULL, NULL, &iosb,
 379                                            dwIoControlCode, lpvInBuffer, cbInBuffer,
 380                                            lpvOutBuffer, cbOutBuffer);
 381         if (lpcbBytesReturned) *lpcbBytesReturned = iosb.Information;
 382     }
 383     if (status) SetLastError( RtlNtStatusToDosError(status) );
 384     return !status;
 385 }