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 "mountmgr.h"
  28 #include "winreg.h"
  29 #include "wine/library.h"
  30 #include "wine/list.h"
  31 #include "wine/unicode.h"
  32 #include "wine/debug.h"
  33
  34 WINE_DEFAULT_DEBUG_CHANNEL(mountmgr);
  35
  36 #define MIN_ID_LEN     4
  37
  38 struct mount_point
  39 {
  40     struct list    entry;   /* entry in mount points list */
  41     DEVICE_OBJECT *device;  /* disk device */
  42     UNICODE_STRING name;    /* device name */
  43     UNICODE_STRING link;    /* DOS device symlink */
  44     void          *id;      /* device unique id */
  45     unsigned int   id_len;
  46 };
  47
  48 static struct list mount_points_list = LIST_INIT(mount_points_list);
  49 static HKEY mount_key;
  50
  51 void set_mount_point_id( struct mount_point *mount, const void *id, unsigned int id_len )
  52 {
  53     RtlFreeHeap( GetProcessHeap(), 0, mount->id );
  54     mount->id_len = max( MIN_ID_LEN, id_len );
  55     if ((mount->id = RtlAllocateHeap( GetProcessHeap(), HEAP_ZERO_MEMORY, mount->id_len )))
  56     {
  57         memcpy( mount->id, id, id_len );
  58         RegSetValueExW( mount_key, mount->link.Buffer, 0, REG_BINARY, mount->id, mount->id_len );
  59     }
  60     else mount->id_len = 0;
  61 }
  62
  63 static struct mount_point *add_mount_point( DEVICE_OBJECT *device, UNICODE_STRING *device_name,
  64                                             const WCHAR *link )
  65 {
  66     struct mount_point *mount;
  67     WCHAR *str;
  68     UINT len = (strlenW(link) + 1) * sizeof(WCHAR) + device_name->Length + sizeof(WCHAR);
  69
  70     if (!(mount = RtlAllocateHeap( GetProcessHeap(), 0, sizeof(*mount) + len ))) return NULL;
  71
  72     str = (WCHAR *)(mount + 1);
  73     strcpyW( str, link );
  74     RtlInitUnicodeString( &mount->link, str );
  75     str += strlenW(str) + 1;
  76     memcpy( str, device_name->Buffer, device_name->Length );
  77     str[device_name->Length / sizeof(WCHAR)] = 0;
  78     mount->name.Buffer = str;
  79     mount->name.Length = device_name->Length;
  80     mount->name.MaximumLength = device_name->Length + sizeof(WCHAR);
  81     mount->device = device;
  82     mount->id = NULL;
  83     list_add_tail( &mount_points_list, &mount->entry );
  84
  85     IoCreateSymbolicLink( &mount->link, device_name );
  86
  87     TRACE( "created %s id %s for %s\n", debugstr_w(mount->link.Buffer),
  88            debugstr_a(mount->id), debugstr_w(mount->name.Buffer) );
  89     return mount;
  90 }
  91
  92 /* create the DosDevices mount point symlink for a new device */
  93 struct mount_point *add_dosdev_mount_point( DEVICE_OBJECT *device, UNICODE_STRING *device_name, int drive )
  94 {
  95     static const WCHAR driveW[] = {'\\','D','o','s','D','e','v','i','c','e','s','\\','%','c',':',0};
  96     WCHAR link[sizeof(driveW)];
  97
  98     sprintfW( link, driveW, 'A' + drive );
  99     return add_mount_point( device, device_name, link );
 100 }
 101
 102 /* create the Volume mount point symlink for a new device */
 103 struct mount_point *add_volume_mount_point( DEVICE_OBJECT *device, UNICODE_STRING *device_name,
 104                                             const GUID *guid )
 105 {
 106     static const WCHAR volumeW[] = {'\\','?','?','\\','V','o','l','u','m','e','{',
 107                                     '%','0','8','x','-','%','0','4','x','-','%','0','4','x','-',
 108                                     '%','0','2','x','%','0','2','x','-','%','0','2','x','%','0','2','x',
 109                                     '%','0','2','x','%','0','2','x','%','0','2','x','%','0','2','x','}',0};
 110     WCHAR link[sizeof(volumeW)];
 111
 112     sprintfW( link, volumeW, guid->Data1, guid->Data2, guid->Data3,
 113               guid->Data4[0], guid->Data4[1], guid->Data4[2], guid->Data4[3],
 114               guid->Data4[4], guid->Data4[5], guid->Data4[6], guid->Data4[7]);
 115     return add_mount_point( device, device_name, link );
 116 }
 117
 118 /* delete the mount point symlinks when a device goes away */
 119 void delete_mount_point( struct mount_point *mount )
 120 {
 121     TRACE( "deleting %s\n", debugstr_w(mount->link.Buffer) );
 122     list_remove( &mount->entry );
 123     RegDeleteValueW( mount_key, mount->link.Buffer );
 124     IoDeleteSymbolicLink( &mount->link );
 125     RtlFreeHeap( GetProcessHeap(), 0, mount->id );
 126     RtlFreeHeap( GetProcessHeap(), 0, mount );
 127 }
 128
 129 /* check if a given mount point matches the requested specs */
 130 static BOOL matching_mount_point( const struct mount_point *mount, const MOUNTMGR_MOUNT_POINT *spec )
 131 {
 132     if (spec->SymbolicLinkNameOffset)
 133     {
 134         const WCHAR *name = (const WCHAR *)((const char *)spec + spec->SymbolicLinkNameOffset);
 135         if (spec->SymbolicLinkNameLength != mount->link.Length) return FALSE;
 136         if (memicmpW( name, mount->link.Buffer, mount->link.Length/sizeof(WCHAR)))
 137             return FALSE;
 138     }
 139     if (spec->DeviceNameOffset)
 140     {
 141         const WCHAR *name = (const WCHAR *)((const char *)spec + spec->DeviceNameOffset);
 142         if (spec->DeviceNameLength != mount->name.Length) return FALSE;
 143         if (memicmpW( name, mount->name.Buffer, mount->name.Length/sizeof(WCHAR)))
 144             return FALSE;
 145     }
 146     if (spec->UniqueIdOffset)
 147     {
 148         const void *id = ((const char *)spec + spec->UniqueIdOffset);
 149         if (spec->UniqueIdLength != mount->id_len) return FALSE;
 150         if (memcmp( id, mount->id, mount->id_len )) return FALSE;
 151     }
 152     return TRUE;
 153 }
 154
 155 /* implementation of IOCTL_MOUNTMGR_QUERY_POINTS */
 156 static NTSTATUS query_mount_points( void *buff, SIZE_T insize,
 157                                     SIZE_T outsize, IO_STATUS_BLOCK *iosb )
 158 {
 159     UINT count, pos, size;
 160     MOUNTMGR_MOUNT_POINT *input = buff;
 161     MOUNTMGR_MOUNT_POINTS *info;
 162     struct mount_point *mount;
 163
 164     /* sanity checks */
 165     if (input->SymbolicLinkNameOffset + input->SymbolicLinkNameLength > insize ||
 166         input->UniqueIdOffset + input->UniqueIdLength > insize ||
 167         input->DeviceNameOffset + input->DeviceNameLength > insize ||
 168         input->SymbolicLinkNameOffset + input->SymbolicLinkNameLength < input->SymbolicLinkNameOffset ||
 169         input->UniqueIdOffset + input->UniqueIdLength < input->UniqueIdOffset ||
 170         input->DeviceNameOffset + input->DeviceNameLength < input->DeviceNameOffset)
 171         return STATUS_INVALID_PARAMETER;
 172
 173     count = size = 0;
 174     LIST_FOR_EACH_ENTRY( mount, &mount_points_list, struct mount_point, entry )
 175     {
 176         if (!matching_mount_point( mount, input )) continue;
 177         size += mount->name.Length;
 178         size += mount->link.Length;
 179         size += mount->id_len;
 180         size = (size + sizeof(WCHAR) - 1) & ~(sizeof(WCHAR) - 1);
 181         count++;
 182     }
 183     pos = FIELD_OFFSET( MOUNTMGR_MOUNT_POINTS, MountPoints[count] );
 184     size += pos;
 185
 186     if (size > outsize)
 187     {
 188         info = buff;
 189         if (size >= sizeof(info->Size)) info->Size = size;
 190         iosb->Information = sizeof(info->Size);
 191         return STATUS_MORE_ENTRIES;
 192     }
 193
 194     input = HeapAlloc( GetProcessHeap(), 0, insize );
 195     if (!input)
 196         return STATUS_NO_MEMORY;
 197     memcpy( input, buff, insize );
 198     info = buff;
 199
 200     info->NumberOfMountPoints = count;
 201     count = 0;
 202     LIST_FOR_EACH_ENTRY( mount, &mount_points_list, struct mount_point, entry )
 203     {
 204         if (!matching_mount_point( mount, input )) continue;
 205
 206         info->MountPoints[count].DeviceNameOffset = pos;
 207         info->MountPoints[count].DeviceNameLength = mount->name.Length;
 208         memcpy( (char *)buff + pos, mount->name.Buffer, mount->name.Length );
 209         pos += mount->name.Length;
 210
 211         info->MountPoints[count].SymbolicLinkNameOffset = pos;
 212         info->MountPoints[count].SymbolicLinkNameLength = mount->link.Length;
 213         memcpy( (char *)buff + pos, mount->link.Buffer, mount->link.Length );
 214         pos += mount->link.Length;
 215
 216         info->MountPoints[count].UniqueIdOffset = pos;
 217         info->MountPoints[count].UniqueIdLength = mount->id_len;
 218         memcpy( (char *)buff + pos, mount->id, mount->id_len );
 219         pos += mount->id_len;
 220         pos = (pos + sizeof(WCHAR) - 1) & ~(sizeof(WCHAR) - 1);
 221         count++;
 222     }
 223     info->Size = pos;
 224     iosb->Information = pos;
 225     HeapFree( GetProcessHeap(), 0, input );
 226     return STATUS_SUCCESS;
 227 }
 228
 229 /* implementation of IOCTL_MOUNTMGR_DEFINE_UNIX_DRIVE */
 230 static NTSTATUS define_unix_drive( const void *in_buff, SIZE_T insize )
 231 {
 232     const struct mountmgr_unix_drive *input = in_buff;
 233     const char *mount_point = NULL, *device = NULL;
 234     unsigned int i;
 235     WCHAR letter = tolowerW( input->letter );
 236
 237     if (letter < 'a' || letter > 'z') return STATUS_INVALID_PARAMETER;
 238     if (input->type > DRIVE_RAMDISK) return STATUS_INVALID_PARAMETER;
 239     if (input->mount_point_offset > insize || input->device_offset > insize)
 240         return STATUS_INVALID_PARAMETER;
 241
 242     /* make sure string are null-terminated */
 243     if (input->mount_point_offset)
 244     {
 245         mount_point = (const char *)in_buff + input->mount_point_offset;
 246         for (i = input->mount_point_offset; i < insize; i++)
 247             if (!*((const char *)in_buff + i)) break;
 248         if (i >= insize) return STATUS_INVALID_PARAMETER;
 249     }
 250     if (input->device_offset)
 251     {
 252         device = (const char *)in_buff + input->device_offset;
 253         for (i = input->device_offset; i < insize; i++)
 254             if (!*((const char *)in_buff + i)) break;
 255         if (i >= insize) return STATUS_INVALID_PARAMETER;
 256     }
 257
 258     if (input->type != DRIVE_NO_ROOT_DIR)
 259     {
 260         enum device_type type = DEVICE_UNKNOWN;
 261
 262         TRACE( "defining %c: dev %s mount %s type %u\n",
 263                letter, debugstr_a(device), debugstr_a(mount_point), input->type );
 264         switch (input->type)
 265         {
 266         case DRIVE_REMOVABLE: type = (letter >= 'c') ? DEVICE_HARDDISK : DEVICE_FLOPPY; break;
 267         case DRIVE_REMOTE:    type = DEVICE_NETWORK; break;
 268         case DRIVE_CDROM:     type = DEVICE_CDROM; break;
 269         case DRIVE_RAMDISK:   type = DEVICE_RAMDISK; break;
 270         case DRIVE_FIXED:     type = DEVICE_HARDDISK_VOL; break;
 271         }
 272         return add_dos_device( letter - 'a', NULL, device, mount_point, type, NULL );
 273     }
 274     else
 275     {
 276         TRACE( "removing %c:\n", letter );
 277         return remove_dos_device( letter - 'a', NULL );
 278     }
 279 }
 280
 281 /* implementation of IOCTL_MOUNTMGR_QUERY_UNIX_DRIVE */
 282 static NTSTATUS query_unix_drive( void *buff, SIZE_T insize,
 283                                   SIZE_T outsize, IO_STATUS_BLOCK *iosb )
 284 {
 285     const struct mountmgr_unix_drive *input = buff;
 286     struct mountmgr_unix_drive *output = NULL;
 287     char *device, *mount_point;
 288     int letter = tolowerW( input->letter );
 289     NTSTATUS status;
 290     DWORD size, type = DEVICE_UNKNOWN;
 291     enum device_type device_type;
 292     char *ptr;
 293
 294     if (letter < 'a' || letter > 'z') return STATUS_INVALID_PARAMETER;
 295
 296     if ((status = query_dos_device( letter - 'a', &device_type, &device, &mount_point ))) return status;
 297     switch (device_type)
 298     {
 299     case DEVICE_UNKNOWN:      type = DRIVE_UNKNOWN; break;
 300     case DEVICE_HARDDISK:     type = DRIVE_REMOVABLE; break;
 301     case DEVICE_HARDDISK_VOL: type = DRIVE_FIXED; break;
 302     case DEVICE_FLOPPY:       type = DRIVE_REMOVABLE; break;
 303     case DEVICE_CDROM:        type = DRIVE_CDROM; break;
 304     case DEVICE_DVD:          type = DRIVE_CDROM; break;
 305     case DEVICE_NETWORK:      type = DRIVE_REMOTE; break;
 306     case DEVICE_RAMDISK:      type = DRIVE_RAMDISK; break;
 307     }
 308
 309     size = sizeof(*output);
 310     if (device) size += strlen(device) + 1;
 311     if (mount_point) size += strlen(mount_point) + 1;
 312
 313     input = NULL;
 314     output = buff;
 315
 316     if (size > outsize)
 317     {
 318         iosb->Information = 0;
 319         if (size >= FIELD_OFFSET( struct mountmgr_unix_drive, size ) + sizeof(output->size))
 320         {
 321             output->size = size;
 322             iosb->Information = FIELD_OFFSET( struct mountmgr_unix_drive, size ) + sizeof(output->size);
 323         }
 324         if (size >= FIELD_OFFSET( struct mountmgr_unix_drive, type ) + sizeof(output->type))
 325         {
 326             output->type = type;
 327             iosb->Information = FIELD_OFFSET( struct mountmgr_unix_drive, type ) + sizeof(output->type);
 328         }
 329         status = STATUS_MORE_ENTRIES;
 330         goto done;
 331     }
 332     output->size = size;
 333     output->letter = letter;
 334     output->type = type;
 335     ptr = (char *)(output + 1);
 336
 337     if (mount_point)
 338     {
 339         output->mount_point_offset = ptr - (char *)output;
 340         strcpy( ptr, mount_point );
 341         ptr += strlen(ptr) + 1;
 342     }
 343     else output->mount_point_offset = 0;
 344
 345     if (device)
 346     {
 347         output->device_offset = ptr - (char *)output;
 348         strcpy( ptr, device );
 349         ptr += strlen(ptr) + 1;
 350     }
 351     else output->device_offset = 0;
 352
 353     TRACE( "returning %c: dev %s mount %s type %u\n",
 354            letter, debugstr_a(device), debugstr_a(mount_point), type );
 355
 356     iosb->Information = ptr - (char *)output;
 357 done:
 358     RtlFreeHeap( GetProcessHeap(), 0, device );
 359     RtlFreeHeap( GetProcessHeap(), 0, mount_point );
 360     return status;
 361 }
 362
 363 /* handler for ioctls on the mount manager device */
 364 static NTSTATUS WINAPI mountmgr_ioctl( DEVICE_OBJECT *device, IRP *irp )
 365 {
 366     IO_STACK_LOCATION *irpsp = IoGetCurrentIrpStackLocation( irp );
 367
 368     TRACE( "ioctl %x insize %u outsize %u\n",
 369            irpsp->Parameters.DeviceIoControl.IoControlCode,
 370            irpsp->Parameters.DeviceIoControl.InputBufferLength,
 371            irpsp->Parameters.DeviceIoControl.OutputBufferLength );
 372
 373     switch(irpsp->Parameters.DeviceIoControl.IoControlCode)
 374     {
 375     case IOCTL_MOUNTMGR_QUERY_POINTS:
 376         if (irpsp->Parameters.DeviceIoControl.InputBufferLength < sizeof(MOUNTMGR_MOUNT_POINT))
 377         {
 378             irp->IoStatus.u.Status = STATUS_INVALID_PARAMETER;
 379             break;
 380         }
 381         irp->IoStatus.u.Status = query_mount_points( irp->AssociatedIrp.SystemBuffer,
 382                                                      irpsp->Parameters.DeviceIoControl.InputBufferLength,
 383                                                      irpsp->Parameters.DeviceIoControl.OutputBufferLength,
 384                                                      &irp->IoStatus );
 385         break;
 386     case IOCTL_MOUNTMGR_DEFINE_UNIX_DRIVE:
 387         if (irpsp->Parameters.DeviceIoControl.InputBufferLength < sizeof(struct mountmgr_unix_drive))
 388         {
 389             irp->IoStatus.u.Status = STATUS_INVALID_PARAMETER;
 390             break;
 391         }
 392         irp->IoStatus.Information = 0;
 393         irp->IoStatus.u.Status = define_unix_drive( irp->AssociatedIrp.SystemBuffer,
 394                                                     irpsp->Parameters.DeviceIoControl.InputBufferLength );
 395         break;
 396     case IOCTL_MOUNTMGR_QUERY_UNIX_DRIVE:
 397         if (irpsp->Parameters.DeviceIoControl.InputBufferLength < sizeof(struct mountmgr_unix_drive))
 398         {
 399             irp->IoStatus.u.Status = STATUS_INVALID_PARAMETER;
 400             break;
 401         }
 402         irp->IoStatus.u.Status = query_unix_drive( irp->AssociatedIrp.SystemBuffer,
 403                                                    irpsp->Parameters.DeviceIoControl.InputBufferLength,
 404                                                    irpsp->Parameters.DeviceIoControl.OutputBufferLength,
 405                                                    &irp->IoStatus );
 406         break;
 407     default:
 408         FIXME( "ioctl %x not supported\n", irpsp->Parameters.DeviceIoControl.IoControlCode );
 409         irp->IoStatus.u.Status = STATUS_NOT_SUPPORTED;
 410         break;
 411     }
 412     IoCompleteRequest( irp, IO_NO_INCREMENT );
 413     return irp->IoStatus.u.Status;
 414 }
 415
 416 /* main entry point for the mount point manager driver */
 417 NTSTATUS WINAPI DriverEntry( DRIVER_OBJECT *driver, UNICODE_STRING *path )
 418 {
 419     static const WCHAR mounted_devicesW[] = {'S','y','s','t','e','m','\\','M','o','u','n','t','e','d','D','e','v','i','c','e','s',0};
 420     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};
 421     static const WCHAR link_mountmgrW[] = {'\\','?','?','\\','M','o','u','n','t','P','o','i','n','t','M','a','n','a','g','e','r',0};
 422     static const WCHAR harddiskW[] = {'\\','D','r','i','v','e','r','\\','H','a','r','d','d','i','s','k',0};
 423     static const WCHAR devicemapW[] = {'H','A','R','D','W','A','R','E','\\','D','E','V','I','C','E','M','A','P',0};
 424     static const WCHAR parallelW[] = {'P','A','R','A','L','L','E','L',' ','P','O','R','T','S',0};
 425     static const WCHAR serialW[] = {'S','E','R','I','A','L','C','O','M','M',0};
 426
 427     UNICODE_STRING nameW, linkW;
 428     DEVICE_OBJECT *device;
 429     NTSTATUS status;
 430     HKEY hkey, devicemap_key;
 431
 432     TRACE( "%s\n", debugstr_w(path->Buffer) );
 433
 434     driver->MajorFunction[IRP_MJ_DEVICE_CONTROL] = mountmgr_ioctl;
 435
 436     RtlInitUnicodeString( &nameW, device_mountmgrW );
 437     RtlInitUnicodeString( &linkW, link_mountmgrW );
 438     if (!(status = IoCreateDevice( driver, 0, &nameW, 0, 0, FALSE, &device )))
 439         status = IoCreateSymbolicLink( &linkW, &nameW );
 440     if (status)
 441     {
 442         FIXME( "failed to create device error %x\n", status );
 443         return status;
 444     }
 445
 446     RegCreateKeyExW( HKEY_LOCAL_MACHINE, mounted_devicesW, 0, NULL,
 447                      REG_OPTION_VOLATILE, KEY_ALL_ACCESS, NULL, &mount_key, NULL );
 448
 449     if (!RegCreateKeyExW( HKEY_LOCAL_MACHINE, devicemapW, 0, NULL, REG_OPTION_VOLATILE,
 450                           KEY_ALL_ACCESS, NULL, &devicemap_key, NULL ))
 451     {
 452         if (!RegCreateKeyExW( devicemap_key, parallelW, 0, NULL, REG_OPTION_VOLATILE,
 453                               KEY_ALL_ACCESS, NULL, &hkey, NULL ))
 454             RegCloseKey( hkey );
 455         if (!RegCreateKeyExW( devicemap_key, serialW, 0, NULL, REG_OPTION_VOLATILE,
 456                               KEY_ALL_ACCESS, NULL, &hkey, NULL ))
 457             RegCloseKey( hkey );
 458         RegCloseKey( devicemap_key );
 459     }
 460
 461     RtlInitUnicodeString( &nameW, harddiskW );
 462     status = IoCreateDriver( &nameW, harddisk_driver_entry );
 463
 464     initialize_dbus();
 465     initialize_diskarbitration();
 466
 467     return status;
 468 }