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( const void *in_buff, SIZE_T insize,
 157                                     void *out_buff, SIZE_T outsize, IO_STATUS_BLOCK *iosb )
 158 {
 159     UINT count, pos, size;
 160     const MOUNTMGR_MOUNT_POINT *input = in_buff;
 161     MOUNTMGR_MOUNT_POINTS *info = out_buff;
 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         if (size >= sizeof(info->Size)) info->Size = size;
 189         iosb->Information = sizeof(info->Size);
 190         return STATUS_MORE_ENTRIES;
 191     }
 192
 193     info->NumberOfMountPoints = count;
 194     count = 0;
 195     LIST_FOR_EACH_ENTRY( mount, &mount_points_list, struct mount_point, entry )
 196     {
 197         if (!matching_mount_point( mount, input )) continue;
 198
 199         info->MountPoints[count].DeviceNameOffset = pos;
 200         info->MountPoints[count].DeviceNameLength = mount->name.Length;
 201         memcpy( (char *)out_buff + pos, mount->name.Buffer, mount->name.Length );
 202         pos += mount->name.Length;
 203
 204         info->MountPoints[count].SymbolicLinkNameOffset = pos;
 205         info->MountPoints[count].SymbolicLinkNameLength = mount->link.Length;
 206         memcpy( (char *)out_buff + pos, mount->link.Buffer, mount->link.Length );
 207         pos += mount->link.Length;
 208
 209         info->MountPoints[count].UniqueIdOffset = pos;
 210         info->MountPoints[count].UniqueIdLength = mount->id_len;
 211         memcpy( (char *)out_buff + pos, mount->id, mount->id_len );
 212         pos += mount->id_len;
 213         pos = (pos + sizeof(WCHAR) - 1) & ~(sizeof(WCHAR) - 1);
 214         count++;
 215     }
 216     info->Size = pos;
 217     iosb->Information = pos;
 218     return STATUS_SUCCESS;
 219 }
 220
 221 /* implementation of IOCTL_MOUNTMGR_DEFINE_UNIX_DRIVE */
 222 static NTSTATUS define_unix_drive( const void *in_buff, SIZE_T insize )
 223 {
 224     const struct mountmgr_unix_drive *input = in_buff;
 225     const char *mount_point = NULL, *device = NULL;
 226     unsigned int i;
 227     WCHAR letter = tolowerW( input->letter );
 228
 229     if (letter < 'a' || letter > 'z') return STATUS_INVALID_PARAMETER;
 230     if (input->type > DRIVE_RAMDISK) return STATUS_INVALID_PARAMETER;
 231     if (input->mount_point_offset > insize || input->device_offset > insize)
 232         return STATUS_INVALID_PARAMETER;
 233
 234     /* make sure string are null-terminated */
 235     if (input->mount_point_offset)
 236     {
 237         mount_point = (const char *)in_buff + input->mount_point_offset;
 238         for (i = input->mount_point_offset; i < insize; i++)
 239             if (!*((const char *)in_buff + i)) break;
 240         if (i >= insize) return STATUS_INVALID_PARAMETER;
 241     }
 242     if (input->device_offset)
 243     {
 244         device = (const char *)in_buff + input->device_offset;
 245         for (i = input->device_offset; i < insize; i++)
 246             if (!*((const char *)in_buff + i)) break;
 247         if (i >= insize) return STATUS_INVALID_PARAMETER;
 248     }
 249
 250     if (input->type != DRIVE_NO_ROOT_DIR)
 251     {
 252         enum device_type type = DEVICE_UNKNOWN;
 253
 254         TRACE( "defining %c: dev %s mount %s type %u\n",
 255                letter, debugstr_a(device), debugstr_a(mount_point), input->type );
 256         switch (input->type)
 257         {
 258         case DRIVE_REMOVABLE: type = (letter >= 'c') ? DEVICE_HARDDISK : DEVICE_FLOPPY; break;
 259         case DRIVE_REMOTE:    type = DEVICE_NETWORK; break;
 260         case DRIVE_CDROM:     type = DEVICE_CDROM; break;
 261         case DRIVE_RAMDISK:   type = DEVICE_RAMDISK; break;
 262         case DRIVE_FIXED:     type = DEVICE_HARDDISK_VOL; break;
 263         }
 264         return add_dos_device( letter - 'a', NULL, device, mount_point, type, NULL );
 265     }
 266     else
 267     {
 268         TRACE( "removing %c:\n", letter );
 269         return remove_dos_device( letter - 'a', NULL );
 270     }
 271 }
 272
 273 /* implementation of IOCTL_MOUNTMGR_QUERY_UNIX_DRIVE */
 274 static NTSTATUS query_unix_drive( const void *in_buff, SIZE_T insize,
 275                                   void *out_buff, SIZE_T outsize, IO_STATUS_BLOCK *iosb )
 276 {
 277     const struct mountmgr_unix_drive *input = in_buff;
 278     struct mountmgr_unix_drive *output = out_buff;
 279     char *device, *mount_point;
 280     int letter = tolowerW( input->letter );
 281     NTSTATUS status;
 282     DWORD size, type = DEVICE_UNKNOWN;
 283     enum device_type device_type;
 284     char *ptr;
 285
 286     if (letter < 'a' || letter > 'z') return STATUS_INVALID_PARAMETER;
 287
 288     if ((status = query_dos_device( letter - 'a', &device_type, &device, &mount_point ))) return status;
 289     switch (device_type)
 290     {
 291     case DEVICE_UNKNOWN:      type = DRIVE_UNKNOWN; break;
 292     case DEVICE_HARDDISK:     type = DRIVE_REMOVABLE; break;
 293     case DEVICE_HARDDISK_VOL: type = DRIVE_FIXED; break;
 294     case DEVICE_FLOPPY:       type = DRIVE_REMOVABLE; break;
 295     case DEVICE_CDROM:        type = DRIVE_CDROM; break;
 296     case DEVICE_NETWORK:      type = DRIVE_REMOTE; break;
 297     case DEVICE_RAMDISK:      type = DRIVE_RAMDISK; break;
 298     }
 299
 300     size = sizeof(*output);
 301     if (device) size += strlen(device) + 1;
 302     if (mount_point) size += strlen(mount_point) + 1;
 303
 304     if (size > outsize)
 305     {
 306         iosb->Information = 0;
 307         if (size >= FIELD_OFFSET( struct mountmgr_unix_drive, size ) + sizeof(output->size))
 308         {
 309             output->size = size;
 310             iosb->Information = FIELD_OFFSET( struct mountmgr_unix_drive, size ) + sizeof(output->size);
 311         }
 312         if (size >= FIELD_OFFSET( struct mountmgr_unix_drive, type ) + sizeof(output->type))
 313         {
 314             output->type = type;
 315             iosb->Information = FIELD_OFFSET( struct mountmgr_unix_drive, type ) + sizeof(output->type);
 316         }
 317         status = STATUS_MORE_ENTRIES;
 318         goto done;
 319     }
 320     output->size = size;
 321     output->letter = letter;
 322     output->type = type;
 323     ptr = (char *)(output + 1);
 324
 325     if (mount_point)
 326     {
 327         output->mount_point_offset = ptr - (char *)output;
 328         strcpy( ptr, mount_point );
 329         ptr += strlen(ptr) + 1;
 330     }
 331     else output->mount_point_offset = 0;
 332
 333     if (device)
 334     {
 335         output->device_offset = ptr - (char *)output;
 336         strcpy( ptr, device );
 337         ptr += strlen(ptr) + 1;
 338     }
 339     else output->device_offset = 0;
 340
 341     TRACE( "returning %c: dev %s mount %s type %u\n",
 342            letter, debugstr_a(device), debugstr_a(mount_point), type );
 343
 344     iosb->Information = ptr - (char *)output;
 345 done:
 346     RtlFreeHeap( GetProcessHeap(), 0, device );
 347     RtlFreeHeap( GetProcessHeap(), 0, mount_point );
 348     return status;
 349 }
 350
 351 /* handler for ioctls on the mount manager device */
 352 static NTSTATUS WINAPI mountmgr_ioctl( DEVICE_OBJECT *device, IRP *irp )
 353 {
 354     IO_STACK_LOCATION *irpsp = irp->Tail.Overlay.s.u.CurrentStackLocation;
 355
 356     TRACE( "ioctl %x insize %u outsize %u\n",
 357            irpsp->Parameters.DeviceIoControl.IoControlCode,
 358            irpsp->Parameters.DeviceIoControl.InputBufferLength,
 359            irpsp->Parameters.DeviceIoControl.OutputBufferLength );
 360
 361     switch(irpsp->Parameters.DeviceIoControl.IoControlCode)
 362     {
 363     case IOCTL_MOUNTMGR_QUERY_POINTS:
 364         if (irpsp->Parameters.DeviceIoControl.InputBufferLength < sizeof(MOUNTMGR_MOUNT_POINT))
 365             return STATUS_INVALID_PARAMETER;
 366         irp->IoStatus.u.Status = query_mount_points( irpsp->Parameters.DeviceIoControl.Type3InputBuffer,
 367                                                      irpsp->Parameters.DeviceIoControl.InputBufferLength,
 368                                                      irp->MdlAddress->StartVa,
 369                                                      irpsp->Parameters.DeviceIoControl.OutputBufferLength,
 370                                                      &irp->IoStatus );
 371         break;
 372     case IOCTL_MOUNTMGR_DEFINE_UNIX_DRIVE:
 373         if (irpsp->Parameters.DeviceIoControl.InputBufferLength < sizeof(struct mountmgr_unix_drive))
 374             return STATUS_INVALID_PARAMETER;
 375         irp->IoStatus.Information = 0;
 376         irp->IoStatus.u.Status = define_unix_drive( irpsp->Parameters.DeviceIoControl.Type3InputBuffer,
 377                                                     irpsp->Parameters.DeviceIoControl.InputBufferLength );
 378         break;
 379     case IOCTL_MOUNTMGR_QUERY_UNIX_DRIVE:
 380         if (irpsp->Parameters.DeviceIoControl.InputBufferLength < sizeof(struct mountmgr_unix_drive))
 381             return STATUS_INVALID_PARAMETER;
 382         irp->IoStatus.u.Status = query_unix_drive( irpsp->Parameters.DeviceIoControl.Type3InputBuffer,
 383                                                    irpsp->Parameters.DeviceIoControl.InputBufferLength,
 384                                                    irp->MdlAddress->StartVa,
 385                                                    irpsp->Parameters.DeviceIoControl.OutputBufferLength,
 386                                                    &irp->IoStatus );
 387         break;
 388     default:
 389         FIXME( "ioctl %x not supported\n", irpsp->Parameters.DeviceIoControl.IoControlCode );
 390         irp->IoStatus.u.Status = STATUS_NOT_SUPPORTED;
 391         break;
 392     }
 393     return irp->IoStatus.u.Status;
 394 }
 395
 396 /* main entry point for the mount point manager driver */
 397 NTSTATUS WINAPI DriverEntry( DRIVER_OBJECT *driver, UNICODE_STRING *path )
 398 {
 399     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};
 400     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};
 401     static const WCHAR link_mountmgrW[] = {'\\','?','?','\\','M','o','u','n','t','P','o','i','n','t','M','a','n','a','g','e','r',0};
 402     static const WCHAR harddiskW[] = {'\\','D','r','i','v','e','r','\\','H','a','r','d','d','i','s','k',0};
 403
 404     UNICODE_STRING nameW, linkW;
 405     DEVICE_OBJECT *device;
 406     NTSTATUS status;
 407
 408     TRACE( "%s\n", debugstr_w(path->Buffer) );
 409
 410     driver->MajorFunction[IRP_MJ_DEVICE_CONTROL] = mountmgr_ioctl;
 411
 412     RtlInitUnicodeString( &nameW, device_mountmgrW );
 413     RtlInitUnicodeString( &linkW, link_mountmgrW );
 414     if (!(status = IoCreateDevice( driver, 0, &nameW, 0, 0, FALSE, &device )))
 415         status = IoCreateSymbolicLink( &linkW, &nameW );
 416     if (status)
 417     {
 418         FIXME( "failed to create device error %x\n", status );
 419         return status;
 420     }
 421
 422     RegCreateKeyExW( HKEY_LOCAL_MACHINE, mounted_devicesW, 0, NULL,
 423                      REG_OPTION_VOLATILE, KEY_ALL_ACCESS, NULL, &mount_key, NULL );
 424
 425     RtlInitUnicodeString( &nameW, harddiskW );
 426     status = IoCreateDriver( &nameW, harddisk_driver_entry );
 427
 428     initialize_hal();
 429     initialize_diskarbitration();
 430
 431     return status;
 432 }