dlls/mountmgr.sys/mountmgr.c

   1 /*
   2  * Mount manager service implementation
   3  *
   4  * Copyright 2008 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include <stdarg.h>
  22 #include <unistd.h>
  23
  24 #define NONAMELESSUNION
  25 #define NONAMELESSSTRUCT
  26
  27 #include "ntstatus.h"
  28 #define WIN32_NO_STATUS
  29 #include "windef.h"
  30 #include "winbase.h"
  31 #include "winternl.h"
  32 #include "winioctl.h"
  33 #include "winreg.h"
  34 #include "ntddstor.h"
  35 #include "ntddcdrm.h"
  36 #include "ddk/wdm.h"
  37 #include "ddk/mountmgr.h"
  38 #include "wine/library.h"
  39 #include "wine/unicode.h"
  40 #include "wine/debug.h"
  41
  42 WINE_DEFAULT_DEBUG_CHANNEL(mountmgr);
  43
  44 #define MAX_DOS_DRIVES 26
  45 #define MAX_MOUNT_POINTS (2 * MAX_DOS_DRIVES)
  46
  47 /* extra info for disk devices, stored in DeviceExtension */
  48 struct disk_device_info
  49 {
  50     UNICODE_STRING        name;     /* device name */
  51     STORAGE_DEVICE_NUMBER devnum;   /* device number info */
  52 };
  53
  54 struct mount_point
  55 {
  56     DEVICE_OBJECT *device;
  57     UNICODE_STRING link;    /* DOS device symlink */
  58     void          *id;      /* device unique id */
  59     unsigned int   id_len;
  60 };
  61
  62 static struct mount_point mount_points[MAX_MOUNT_POINTS];
  63 static HKEY mount_key;
  64
  65 static inline UNICODE_STRING *get_device_name( DEVICE_OBJECT *dev )
  66 {
  67     return &((struct disk_device_info *)dev->DeviceExtension)->name;
  68 }
  69
  70 /* read a Unix symlink; returned buffer must be freed by caller */
  71 static char *read_symlink( const char *path )
  72 {
  73     char *buffer;
  74     int ret, size = 128;
  75
  76     for (;;)
  77     {
  78         if (!(buffer = RtlAllocateHeap( GetProcessHeap(), 0, size )))
  79         {
  80             SetLastError( ERROR_NOT_ENOUGH_MEMORY );
  81             return 0;
  82         }
  83         ret = readlink( path, buffer, size );
  84         if (ret == -1)
  85         {
  86             RtlFreeHeap( GetProcessHeap(), 0, buffer );
  87             return 0;
  88         }
  89         if (ret != size)
  90         {
  91             buffer[ret] = 0;
  92             return buffer;
  93         }
  94         RtlFreeHeap( GetProcessHeap(), 0, buffer );
  95         size *= 2;
  96     }
  97 }
  98
  99 static NTSTATUS create_disk_device( DRIVER_OBJECT *driver, DWORD type, DEVICE_OBJECT **dev_obj )
 100 {
 101     static const WCHAR harddiskW[] = {'\\','D','e','v','i','c','e',
 102                                       '\\','H','a','r','d','d','i','s','k','V','o','l','u','m','e','%','u',0};
 103     static const WCHAR cdromW[] = {'\\','D','e','v','i','c','e','\\','C','d','R','o','m','%','u',0};
 104     static const WCHAR floppyW[] = {'\\','D','e','v','i','c','e','\\','F','l','o','p','p','y','%','u',0};
 105
 106     UINT i, first = 0;
 107     NTSTATUS status = 0;
 108     const WCHAR *format;
 109     UNICODE_STRING name;
 110     struct disk_device_info *info;
 111
 112     switch(type)
 113     {
 114     case DRIVE_REMOVABLE:
 115         format = floppyW;
 116         break;
 117     case DRIVE_CDROM:
 118         format = cdromW;
 119         break;
 120     case DRIVE_FIXED:
 121     default:  /* FIXME */
 122         format = harddiskW;
 123         first = 1;  /* harddisk volumes start counting from 1 */
 124         break;
 125     }
 126
 127     name.MaximumLength = (strlenW(format) + 10) * sizeof(WCHAR);
 128     name.Buffer = RtlAllocateHeap( GetProcessHeap(), 0, name.MaximumLength );
 129     for (i = first; i < 32; i++)
 130     {
 131         sprintfW( name.Buffer, format, i );
 132         name.Length = strlenW(name.Buffer) * sizeof(WCHAR);
 133         status = IoCreateDevice( driver, sizeof(*info), &name, 0, 0, FALSE, dev_obj );
 134         if (status != STATUS_OBJECT_NAME_COLLISION) break;
 135     }
 136     if (!status)
 137     {
 138         info = (*dev_obj)->DeviceExtension;
 139         info->name = name;
 140         switch(type)
 141         {
 142         case DRIVE_REMOVABLE:
 143             info->devnum.DeviceType = FILE_DEVICE_DISK;
 144             info->devnum.DeviceNumber = i;
 145             info->devnum.PartitionNumber = ~0u;
 146             break;
 147         case DRIVE_CDROM:
 148             info->devnum.DeviceType = FILE_DEVICE_CD_ROM;
 149             info->devnum.DeviceNumber = i;
 150             info->devnum.PartitionNumber = ~0u;
 151             break;
 152         case DRIVE_FIXED:
 153         default:  /* FIXME */
 154             info->devnum.DeviceType = FILE_DEVICE_DISK;
 155             info->devnum.DeviceNumber = 0;
 156             info->devnum.PartitionNumber = i;
 157             break;
 158         }
 159     }
 160     else
 161     {
 162         FIXME( "IoCreateDevice %s got %x\n", debugstr_w(name.Buffer), status );
 163         RtlFreeUnicodeString( &name );
 164     }
 165     return status;
 166 }
 167
 168
 169 static NTSTATUS add_mount_point( DRIVER_OBJECT *driver, DWORD type, int drive,
 170                                  const void *id, unsigned int id_len )
 171 {
 172     static const WCHAR driveW[] = {'\\','D','o','s','D','e','v','i','c','e','s','\\','%','c',':',0};
 173     static const WCHAR volumeW[] = {'\\','?','?','\\','V','o','l','u','m','e','{',
 174                                     '%','0','8','x','-','%','0','4','x','-','%','0','4','x','-',
 175                                     '%','0','2','x','%','0','2','x','-','%','0','2','x','%','0','2','x',
 176                                     '%','0','2','x','%','0','2','x','%','0','2','x','%','0','2','x','}',0};
 177     WCHAR *drive_link, *volume_link;
 178     NTSTATUS status;
 179     GUID guid;
 180     UINT i;
 181     struct mount_point *mount_drive = NULL, *mount_volume = NULL;
 182
 183     /* find two free mount points */
 184
 185     for (i = 0; i < MAX_MOUNT_POINTS; i++)
 186     {
 187         if (mount_points[i].device) continue;
 188         if (!mount_drive)
 189         {
 190             mount_drive = &mount_points[i];
 191             continue;
 192         }
 193         mount_volume = &mount_points[i];
 194         break;
 195     }
 196     if (!mount_volume) return STATUS_NO_MEMORY;
 197
 198     /* create the volume */
 199
 200     memset( &guid, 0, sizeof(guid) );  /* FIXME */
 201     guid.Data4[7] = 'A' + drive;
 202
 203     drive_link = RtlAllocateHeap( GetProcessHeap(), 0, sizeof(driveW) );
 204     volume_link = RtlAllocateHeap( GetProcessHeap(), 0, sizeof(volumeW) );
 205     sprintfW( drive_link, driveW, 'A' + drive );
 206     sprintfW( volume_link, volumeW, guid.Data1, guid.Data2, guid.Data3,
 207               guid.Data4[0], guid.Data4[1], guid.Data4[2], guid.Data4[3],
 208               guid.Data4[4], guid.Data4[5], guid.Data4[6], guid.Data4[7]);
 209
 210     RtlInitUnicodeString( &mount_drive->link, drive_link );
 211     RtlInitUnicodeString( &mount_volume->link, volume_link );
 212     status = create_disk_device( driver, type, &mount_drive->device );
 213     if (status)
 214     {
 215         RtlFreeUnicodeString( &mount_drive->link );
 216         RtlFreeUnicodeString( &mount_volume->link );
 217         return status;
 218     }
 219
 220     mount_volume->device = mount_drive->device;  /* FIXME: incr ref count */
 221     mount_drive->id = RtlAllocateHeap( GetProcessHeap(), 0, id_len );
 222     mount_drive->id_len = id_len;
 223     memcpy( mount_drive->id, id, id_len );
 224     mount_volume->id = RtlAllocateHeap( GetProcessHeap(), 0, id_len );
 225     mount_volume->id_len = id_len;
 226     memcpy( mount_volume->id, id, id_len );
 227
 228     IoCreateSymbolicLink( &mount_drive->link, get_device_name(mount_drive->device) );
 229     IoCreateSymbolicLink( &mount_volume->link, get_device_name(mount_volume->device) );
 230
 231     TRACE( "created device %s symlinks %s %s\n", debugstr_w(get_device_name(mount_drive->device)->Buffer),
 232            debugstr_w(mount_drive->link.Buffer), debugstr_w(mount_volume->link.Buffer) );
 233
 234     RegSetValueExW( mount_key, mount_drive->link.Buffer, 0, REG_BINARY,
 235                     mount_drive->id, mount_drive->id_len );
 236     RegSetValueExW( mount_key, mount_volume->link.Buffer, 0, REG_BINARY,
 237                     mount_volume->id, mount_volume->id_len );
 238
 239     return STATUS_SUCCESS;
 240 }
 241
 242 /* check if a given mount point matches the requested specs */
 243 static BOOL matching_mount_point( const struct mount_point *mount, const MOUNTMGR_MOUNT_POINT *spec )
 244 {
 245     if (spec->SymbolicLinkNameOffset)
 246     {
 247         const WCHAR *name = (const WCHAR *)((const char *)spec + spec->SymbolicLinkNameOffset);
 248         if (spec->SymbolicLinkNameLength != mount->link.Length) return FALSE;
 249         if (memicmpW( name, mount->link.Buffer, mount->link.Length/sizeof(WCHAR)))
 250             return FALSE;
 251     }
 252     if (spec->DeviceNameOffset)
 253     {
 254         const WCHAR *name = (const WCHAR *)((const char *)spec + spec->DeviceNameOffset);
 255         const UNICODE_STRING *dev_name = get_device_name( mount->device );
 256         if (spec->DeviceNameLength != dev_name->Length) return FALSE;
 257         if (memicmpW( name, dev_name->Buffer, dev_name->Length/sizeof(WCHAR)))
 258             return FALSE;
 259     }
 260     if (spec->UniqueIdOffset)
 261     {
 262         const void *id = ((const char *)spec + spec->UniqueIdOffset);
 263         if (spec->UniqueIdLength != mount->id_len) return FALSE;
 264         if (memcmp( id, mount->id, mount->id_len )) return FALSE;
 265     }
 266     return TRUE;
 267 }
 268
 269 /* implementation of IOCTL_MOUNTMGR_QUERY_POINTS */
 270 static NTSTATUS query_mount_points( const void *in_buff, SIZE_T insize,
 271                                     void *out_buff, SIZE_T outsize, IO_STATUS_BLOCK *iosb )
 272 {
 273     UINT i, j, pos, size;
 274     const MOUNTMGR_MOUNT_POINT *input = in_buff;
 275     MOUNTMGR_MOUNT_POINTS *info = out_buff;
 276     UNICODE_STRING *dev_name;
 277
 278     /* sanity checks */
 279     if (input->SymbolicLinkNameOffset + input->SymbolicLinkNameLength > insize ||
 280         input->UniqueIdOffset + input->UniqueIdLength > insize ||
 281         input->DeviceNameOffset + input->DeviceNameLength > insize ||
 282         input->SymbolicLinkNameOffset + input->SymbolicLinkNameLength < input->SymbolicLinkNameOffset ||
 283         input->UniqueIdOffset + input->UniqueIdLength < input->UniqueIdOffset ||
 284         input->DeviceNameOffset + input->DeviceNameLength < input->DeviceNameOffset)
 285         return STATUS_INVALID_PARAMETER;
 286
 287     for (i = j = size = 0; i < MAX_MOUNT_POINTS; i++)
 288     {
 289         if (!mount_points[i].device) continue;
 290         if (!matching_mount_point( &mount_points[i], input )) continue;
 291         size += get_device_name(mount_points[i].device)->Length;
 292         size += mount_points[i].link.Length;
 293         j++;
 294     }
 295     pos = FIELD_OFFSET( MOUNTMGR_MOUNT_POINTS, MountPoints[j] );
 296     size += pos;
 297
 298     if (size > outsize)
 299     {
 300         if (size >= sizeof(info->Size)) info->Size = size;
 301         iosb->Information = sizeof(info->Size);
 302         return STATUS_MORE_ENTRIES;
 303     }
 304
 305     info->NumberOfMountPoints = j;
 306     for (i = j = 0; i < MAX_MOUNT_POINTS; i++)
 307     {
 308         if (!mount_points[i].device) continue;
 309         if (!matching_mount_point( &mount_points[i], input )) continue;
 310         info->MountPoints[j].UniqueIdOffset = 0;  /* FIXME */
 311         info->MountPoints[j].UniqueIdLength = 0;
 312
 313         dev_name = get_device_name( mount_points[i].device );
 314         info->MountPoints[j].DeviceNameOffset = pos;
 315         info->MountPoints[j].DeviceNameLength = dev_name->Length;
 316         memcpy( (char *)out_buff + pos, dev_name->Buffer, dev_name->Length );
 317         pos += dev_name->Length;
 318
 319         info->MountPoints[j].SymbolicLinkNameOffset = pos;
 320         info->MountPoints[j].SymbolicLinkNameLength = mount_points[i].link.Length;
 321         memcpy( (char *)out_buff + pos, mount_points[i].link.Buffer, mount_points[i].link.Length );
 322         pos += mount_points[i].link.Length;
 323         j++;
 324     }
 325     info->Size = pos;
 326     iosb->Information = pos;
 327     return STATUS_SUCCESS;
 328 }
 329
 330 /* handler for ioctls on the mount manager device */
 331 static NTSTATUS WINAPI mountmgr_ioctl( DEVICE_OBJECT *device, IRP *irp )
 332 {
 333     IO_STACK_LOCATION *irpsp = irp->Tail.Overlay.s.u.CurrentStackLocation;
 334
 335     TRACE( "ioctl %x insize %u outsize %u\n",
 336            irpsp->Parameters.DeviceIoControl.IoControlCode,
 337            irpsp->Parameters.DeviceIoControl.InputBufferLength,
 338            irpsp->Parameters.DeviceIoControl.OutputBufferLength );
 339
 340     switch(irpsp->Parameters.DeviceIoControl.IoControlCode)
 341     {
 342     case IOCTL_MOUNTMGR_QUERY_POINTS:
 343         if (irpsp->Parameters.DeviceIoControl.InputBufferLength < sizeof(MOUNTMGR_MOUNT_POINT))
 344             return STATUS_INVALID_PARAMETER;
 345         irp->IoStatus.u.Status = query_mount_points( irpsp->Parameters.DeviceIoControl.Type3InputBuffer,
 346                                                      irpsp->Parameters.DeviceIoControl.InputBufferLength,
 347                                                      irp->MdlAddress->StartVa,
 348                                                      irpsp->Parameters.DeviceIoControl.OutputBufferLength,
 349                                                      &irp->IoStatus );
 350         break;
 351     default:
 352         FIXME( "ioctl %x not supported\n", irpsp->Parameters.DeviceIoControl.IoControlCode );
 353         irp->IoStatus.u.Status = STATUS_NOT_SUPPORTED;
 354         break;
 355     }
 356     return irp->IoStatus.u.Status;
 357 }
 358
 359 /* handler for ioctls on the harddisk device */
 360 static NTSTATUS WINAPI harddisk_ioctl( DEVICE_OBJECT *device, IRP *irp )
 361 {
 362     IO_STACK_LOCATION *irpsp = irp->Tail.Overlay.s.u.CurrentStackLocation;
 363     struct disk_device_info *disk_info = device->DeviceExtension;
 364
 365     TRACE( "ioctl %x insize %u outsize %u\n",
 366            irpsp->Parameters.DeviceIoControl.IoControlCode,
 367            irpsp->Parameters.DeviceIoControl.InputBufferLength,
 368            irpsp->Parameters.DeviceIoControl.OutputBufferLength );
 369
 370     switch(irpsp->Parameters.DeviceIoControl.IoControlCode)
 371     {
 372     case IOCTL_DISK_GET_DRIVE_GEOMETRY:
 373     {
 374         DISK_GEOMETRY info;
 375         DWORD len = min( sizeof(info), irpsp->Parameters.DeviceIoControl.OutputBufferLength );
 376
 377         info.Cylinders.QuadPart = 10000;
 378         info.MediaType = (disk_info->devnum.DeviceType == FILE_DEVICE_DISK) ? FixedMedia : RemovableMedia;
 379         info.TracksPerCylinder = 255;
 380         info.SectorsPerTrack = 63;
 381         info.BytesPerSector = 512;
 382         memcpy( irp->MdlAddress->StartVa, &info, len );
 383         irp->IoStatus.Information = len;
 384         irp->IoStatus.u.Status = STATUS_SUCCESS;
 385         break;
 386     }
 387     case IOCTL_STORAGE_GET_DEVICE_NUMBER:
 388     {
 389         DWORD len = min( sizeof(disk_info->devnum), irpsp->Parameters.DeviceIoControl.OutputBufferLength );
 390
 391         memcpy( irp->MdlAddress->StartVa, &disk_info->devnum, len );
 392         irp->IoStatus.Information = len;
 393         irp->IoStatus.u.Status = STATUS_SUCCESS;
 394         break;
 395     }
 396     case IOCTL_CDROM_READ_TOC:
 397         irp->IoStatus.u.Status = STATUS_INVALID_DEVICE_REQUEST;
 398         break;
 399     default:
 400         FIXME( "unsupported ioctl %x\n", irpsp->Parameters.DeviceIoControl.IoControlCode );
 401         irp->IoStatus.u.Status = STATUS_NOT_SUPPORTED;
 402         break;
 403     }
 404     return irp->IoStatus.u.Status;
 405 }
 406
 407 /* create mount points for mapped drives */
 408 static void create_drive_mount_points( DRIVER_OBJECT *driver )
 409 {
 410     const char *config_dir = wine_get_config_dir();
 411     char *buffer, *p, *link;
 412     unsigned int i;
 413
 414     if ((buffer = RtlAllocateHeap( GetProcessHeap(), 0,
 415                                    strlen(config_dir) + sizeof("/dosdevices/a:") )))
 416     {
 417         strcpy( buffer, config_dir );
 418         strcat( buffer, "/dosdevices/a:" );
 419         p = buffer + strlen(buffer) - 2;
 420
 421         for (i = 0; i < MAX_DOS_DRIVES; i++)
 422         {
 423             *p = 'a' + i;
 424             if (!(link = read_symlink( buffer ))) continue;
 425             add_mount_point( driver, DRIVE_FIXED, i, link, strlen(link) );
 426             RtlFreeHeap( GetProcessHeap(), 0, link );
 427         }
 428         RtlFreeHeap( GetProcessHeap(), 0, buffer );
 429     }
 430 }
 431
 432 /* driver entry point for the harddisk driver */
 433 static NTSTATUS WINAPI harddisk_driver_entry( DRIVER_OBJECT *driver, UNICODE_STRING *path )
 434 {
 435     static const WCHAR mounted_devicesW[] = {'S','y','s','t','e','m','\\',
 436                                              'M','o','u','n','t','e','d','D','e','v','i','c','e','s',0};
 437     static const WCHAR harddisk0W[] = {'\\','D','e','v','i','c','e',
 438                                        '\\','H','a','r','d','d','i','s','k','0',0};
 439     static const WCHAR physdrive0W[] = {'\\','?','?','\\','P','h','y','s','i','c','a','l','D','r','i','v','e','0',0};
 440
 441     UNICODE_STRING nameW, linkW;
 442     DEVICE_OBJECT *device;
 443     NTSTATUS status;
 444     struct disk_device_info *info;
 445
 446     driver->MajorFunction[IRP_MJ_DEVICE_CONTROL] = harddisk_ioctl;
 447
 448     RegCreateKeyExW( HKEY_LOCAL_MACHINE, mounted_devicesW, 0, NULL,
 449                      REG_OPTION_VOLATILE, KEY_ALL_ACCESS, NULL, &mount_key, NULL );
 450
 451     RtlInitUnicodeString( &nameW, harddisk0W );
 452     RtlInitUnicodeString( &linkW, physdrive0W );
 453     if (!(status = IoCreateDevice( driver, sizeof(*info), &nameW, 0, 0, FALSE, &device )))
 454         status = IoCreateSymbolicLink( &linkW, &nameW );
 455     if (status)
 456     {
 457         FIXME( "failed to create device error %x\n", status );
 458         return status;
 459     }
 460     info = device->DeviceExtension;
 461     info->name = nameW;
 462     info->devnum.DeviceType = FILE_DEVICE_DISK;
 463     info->devnum.DeviceNumber = 0;
 464     info->devnum.PartitionNumber = 0;
 465
 466     create_drive_mount_points( driver );
 467
 468     return status;
 469 }
 470
 471 /* main entry point for the mount point manager driver */
 472 NTSTATUS WINAPI DriverEntry( DRIVER_OBJECT *driver, UNICODE_STRING *path )
 473 {
 474     static const WCHAR device_mountmgrW[] = {'\\','D','e','v','i','c','e','\\','M','o','u','n','t','P','o','i','n','t','M','a','n','a','g','e','r',0};
 475     static const WCHAR link_mountmgrW[] = {'\\','?','?','\\','M','o','u','n','t','P','o','i','n','t','M','a','n','a','g','e','r',0};
 476     static const WCHAR harddiskW[] = {'\\','D','r','i','v','e','r','\\','H','a','r','d','d','i','s','k',0};
 477
 478     UNICODE_STRING nameW, linkW;
 479     DEVICE_OBJECT *device;
 480     NTSTATUS status;
 481
 482     TRACE( "%s\n", debugstr_w(path->Buffer) );
 483
 484     driver->MajorFunction[IRP_MJ_DEVICE_CONTROL] = mountmgr_ioctl;
 485
 486     RtlInitUnicodeString( &nameW, device_mountmgrW );
 487     RtlInitUnicodeString( &linkW, link_mountmgrW );
 488     if (!(status = IoCreateDevice( driver, 0, &nameW, 0, 0, FALSE, &device )))
 489         status = IoCreateSymbolicLink( &linkW, &nameW );
 490     if (status)
 491     {
 492         FIXME( "failed to create device error %x\n", status );
 493         return status;
 494     }
 495
 496     RtlInitUnicodeString( &nameW, harddiskW );
 497     status = IoCreateDriver( &nameW, harddisk_driver_entry );
 498
 499     return status;
 500 }