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 "ddk/wdm.h"
  35 #include "ddk/mountmgr.h"
  36 #include "wine/library.h"
  37 #include "wine/unicode.h"
  38 #include "wine/debug.h"
  39
  40 WINE_DEFAULT_DEBUG_CHANNEL(mountmgr);
  41
  42 #define MAX_DOS_DRIVES 26
  43 #define MAX_MOUNT_POINTS (2 * MAX_DOS_DRIVES)
  44
  45 /* extra info for disk devices, stored in DeviceExtension */
  46 struct disk_device_info
  47 {
  48     UNICODE_STRING name;    /* device name */
  49 };
  50
  51 struct mount_point
  52 {
  53     DEVICE_OBJECT *device;
  54     UNICODE_STRING link;    /* DOS device symlink */
  55     void          *id;      /* device unique id */
  56     unsigned int   id_len;
  57 };
  58
  59 static struct mount_point mount_points[MAX_MOUNT_POINTS];
  60 static HKEY mount_key;
  61
  62 static inline UNICODE_STRING *get_device_name( DEVICE_OBJECT *dev )
  63 {
  64     return &((struct disk_device_info *)dev->DeviceExtension)->name;
  65 }
  66
  67 /* read a Unix symlink; returned buffer must be freed by caller */
  68 static char *read_symlink( const char *path )
  69 {
  70     char *buffer;
  71     int ret, size = 128;
  72
  73     for (;;)
  74     {
  75         if (!(buffer = RtlAllocateHeap( GetProcessHeap(), 0, size )))
  76         {
  77             SetLastError( ERROR_NOT_ENOUGH_MEMORY );
  78             return 0;
  79         }
  80         ret = readlink( path, buffer, size );
  81         if (ret == -1)
  82         {
  83             RtlFreeHeap( GetProcessHeap(), 0, buffer );
  84             return 0;
  85         }
  86         if (ret != size)
  87         {
  88             buffer[ret] = 0;
  89             return buffer;
  90         }
  91         RtlFreeHeap( GetProcessHeap(), 0, buffer );
  92         size *= 2;
  93     }
  94 }
  95
  96 static NTSTATUS create_disk_device( DRIVER_OBJECT *driver, DWORD type, DEVICE_OBJECT **dev_obj )
  97 {
  98     static const WCHAR harddiskW[] = {'\\','D','e','v','i','c','e',
  99                                       '\\','H','a','r','d','d','i','s','k','V','o','l','u','m','e','%','u',0};
 100     static const WCHAR cdromW[] = {'\\','D','e','v','i','c','e','\\','C','d','R','o','m','%','u',0};
 101     static const WCHAR floppyW[] = {'\\','D','e','v','i','c','e','\\','F','l','o','p','p','y','%','u',0};
 102
 103     UINT i, first = 0;
 104     NTSTATUS status = 0;
 105     const WCHAR *format;
 106     UNICODE_STRING name;
 107     struct disk_device_info *info;
 108
 109     switch(type)
 110     {
 111     case DRIVE_REMOVABLE:
 112         format = floppyW;
 113         break;
 114     case DRIVE_CDROM:
 115         format = cdromW;
 116         break;
 117     case DRIVE_FIXED:
 118     default:  /* FIXME */
 119         format = harddiskW;
 120         first = 1;  /* harddisk volumes start counting from 1 */
 121         break;
 122     }
 123
 124     name.MaximumLength = (strlenW(format) + 10) * sizeof(WCHAR);
 125     name.Buffer = RtlAllocateHeap( GetProcessHeap(), 0, name.MaximumLength );
 126     for (i = first; i < 32; i++)
 127     {
 128         sprintfW( name.Buffer, format, i );
 129         name.Length = strlenW(name.Buffer) * sizeof(WCHAR);
 130         status = IoCreateDevice( driver, sizeof(*info), &name, 0, 0, FALSE, dev_obj );
 131         if (status != STATUS_OBJECT_NAME_COLLISION) break;
 132     }
 133     if (!status)
 134     {
 135         info = (*dev_obj)->DeviceExtension;
 136         info->name = name;
 137     }
 138     else
 139     {
 140         FIXME( "IoCreateDevice %s got %x\n", debugstr_w(name.Buffer), status );
 141         RtlFreeUnicodeString( &name );
 142     }
 143     return status;
 144 }
 145
 146
 147 static NTSTATUS add_mount_point( DRIVER_OBJECT *driver, DWORD type, int drive,
 148                                  const void *id, unsigned int id_len )
 149 {
 150     static const WCHAR driveW[] = {'\\','D','o','s','D','e','v','i','c','e','s','\\','%','c',':',0};
 151     static const WCHAR volumeW[] = {'\\','?','?','\\','V','o','l','u','m','e','{',
 152                                     '%','0','8','x','-','%','0','4','x','-','%','0','4','x','-',
 153                                     '%','0','2','x','%','0','2','x','-','%','0','2','x','%','0','2','x',
 154                                     '%','0','2','x','%','0','2','x','%','0','2','x','%','0','2','x','}',0};
 155     WCHAR *drive_link, *volume_link;
 156     NTSTATUS status;
 157     GUID guid;
 158     UINT i;
 159     struct mount_point *mount_drive = NULL, *mount_volume = NULL;
 160
 161     /* find two free mount points */
 162
 163     for (i = 0; i < MAX_MOUNT_POINTS; i++)
 164     {
 165         if (mount_points[i].device) continue;
 166         if (!mount_drive)
 167         {
 168             mount_drive = &mount_points[i];
 169             continue;
 170         }
 171         mount_volume = &mount_points[i];
 172         break;
 173     }
 174     if (!mount_volume) return STATUS_NO_MEMORY;
 175
 176     /* create the volume */
 177
 178     memset( &guid, 0, sizeof(guid) );  /* FIXME */
 179     guid.Data4[7] = 'A' + drive;
 180
 181     drive_link = RtlAllocateHeap( GetProcessHeap(), 0, sizeof(driveW) );
 182     volume_link = RtlAllocateHeap( GetProcessHeap(), 0, sizeof(volumeW) );
 183     sprintfW( drive_link, driveW, 'A' + drive );
 184     sprintfW( volume_link, volumeW, guid.Data1, guid.Data2, guid.Data3,
 185               guid.Data4[0], guid.Data4[1], guid.Data4[2], guid.Data4[3],
 186               guid.Data4[4], guid.Data4[5], guid.Data4[6], guid.Data4[7]);
 187
 188     RtlInitUnicodeString( &mount_drive->link, drive_link );
 189     RtlInitUnicodeString( &mount_volume->link, volume_link );
 190     status = create_disk_device( driver, type, &mount_drive->device );
 191     if (status)
 192     {
 193         RtlFreeUnicodeString( &mount_drive->link );
 194         RtlFreeUnicodeString( &mount_volume->link );
 195         return status;
 196     }
 197
 198     mount_volume->device = mount_drive->device;  /* FIXME: incr ref count */
 199     mount_drive->id = RtlAllocateHeap( GetProcessHeap(), 0, id_len );
 200     mount_drive->id_len = id_len;
 201     memcpy( mount_drive->id, id, id_len );
 202     mount_volume->id = RtlAllocateHeap( GetProcessHeap(), 0, id_len );
 203     mount_volume->id_len = id_len;
 204     memcpy( mount_volume->id, id, id_len );
 205
 206     IoCreateSymbolicLink( &mount_drive->link, get_device_name(mount_drive->device) );
 207     IoCreateSymbolicLink( &mount_volume->link, get_device_name(mount_volume->device) );
 208
 209     TRACE( "created device %s symlinks %s %s\n", debugstr_w(get_device_name(mount_drive->device)->Buffer),
 210            debugstr_w(mount_drive->link.Buffer), debugstr_w(mount_volume->link.Buffer) );
 211
 212     RegSetValueExW( mount_key, mount_drive->link.Buffer, 0, REG_BINARY,
 213                     mount_drive->id, mount_drive->id_len );
 214     RegSetValueExW( mount_key, mount_volume->link.Buffer, 0, REG_BINARY,
 215                     mount_volume->id, mount_volume->id_len );
 216
 217     return STATUS_SUCCESS;
 218 }
 219
 220 /* handler for ioctls on the mount manager device */
 221 static NTSTATUS WINAPI mountmgr_ioctl( DEVICE_OBJECT *device, IRP *irp )
 222 {
 223     IO_STACK_LOCATION *irpsp = irp->Tail.Overlay.s.u.CurrentStackLocation;
 224
 225     TRACE( "ioctl %x insize %u outsize %u\n",
 226            irpsp->Parameters.DeviceIoControl.IoControlCode,
 227            irpsp->Parameters.DeviceIoControl.InputBufferLength,
 228            irpsp->Parameters.DeviceIoControl.OutputBufferLength );
 229
 230     switch(irpsp->Parameters.DeviceIoControl.IoControlCode)
 231     {
 232     default:
 233         FIXME( "ioctl %x not supported\n", irpsp->Parameters.DeviceIoControl.IoControlCode );
 234         irp->IoStatus.u.Status = STATUS_NOT_SUPPORTED;
 235         break;
 236     }
 237     return irp->IoStatus.u.Status;
 238 }
 239
 240 /* handler for ioctls on the harddisk device */
 241 static NTSTATUS WINAPI harddisk_ioctl( DEVICE_OBJECT *device, IRP *irp )
 242 {
 243     IO_STACK_LOCATION *irpsp = irp->Tail.Overlay.s.u.CurrentStackLocation;
 244
 245     TRACE( "ioctl %x insize %u outsize %u\n",
 246            irpsp->Parameters.DeviceIoControl.IoControlCode,
 247            irpsp->Parameters.DeviceIoControl.InputBufferLength,
 248            irpsp->Parameters.DeviceIoControl.OutputBufferLength );
 249
 250     switch(irpsp->Parameters.DeviceIoControl.IoControlCode)
 251     {
 252     default:
 253         FIXME( "unsupported ioctl %x\n", irpsp->Parameters.DeviceIoControl.IoControlCode );
 254         irp->IoStatus.u.Status = STATUS_NOT_SUPPORTED;
 255         break;
 256     }
 257     return irp->IoStatus.u.Status;
 258 }
 259
 260 /* create mount points for mapped drives */
 261 static void create_drive_mount_points( DRIVER_OBJECT *driver )
 262 {
 263     const char *config_dir = wine_get_config_dir();
 264     char *buffer, *p, *link;
 265     unsigned int i;
 266
 267     if ((buffer = RtlAllocateHeap( GetProcessHeap(), 0,
 268                                    strlen(config_dir) + sizeof("/dosdevices/a:") )))
 269     {
 270         strcpy( buffer, config_dir );
 271         strcat( buffer, "/dosdevices/a:" );
 272         p = buffer + strlen(buffer) - 2;
 273
 274         for (i = 0; i < MAX_DOS_DRIVES; i++)
 275         {
 276             *p = 'a' + i;
 277             if (!(link = read_symlink( buffer ))) continue;
 278             add_mount_point( driver, DRIVE_FIXED, i, link, strlen(link) );
 279             RtlFreeHeap( GetProcessHeap(), 0, link );
 280         }
 281         RtlFreeHeap( GetProcessHeap(), 0, buffer );
 282     }
 283 }
 284
 285 /* driver entry point for the harddisk driver */
 286 static NTSTATUS WINAPI harddisk_driver_entry( DRIVER_OBJECT *driver, UNICODE_STRING *path )
 287 {
 288     static const WCHAR mounted_devicesW[] = {'S','y','s','t','e','m','\\',
 289                                              'M','o','u','n','t','e','d','D','e','v','i','c','e','s',0};
 290     static const WCHAR harddisk0W[] = {'\\','D','e','v','i','c','e',
 291                                        '\\','H','a','r','d','d','i','s','k','0',0};
 292     static const WCHAR physdrive0W[] = {'\\','?','?','\\','P','h','y','s','i','c','a','l','D','r','i','v','e','0',0};
 293
 294     UNICODE_STRING nameW, linkW;
 295     DEVICE_OBJECT *device;
 296     NTSTATUS status;
 297
 298     driver->MajorFunction[IRP_MJ_DEVICE_CONTROL] = harddisk_ioctl;
 299
 300     RegCreateKeyExW( HKEY_LOCAL_MACHINE, mounted_devicesW, 0, NULL,
 301                      REG_OPTION_VOLATILE, KEY_ALL_ACCESS, NULL, &mount_key, NULL );
 302
 303     RtlInitUnicodeString( &nameW, harddisk0W );
 304     RtlInitUnicodeString( &linkW, physdrive0W );
 305     if (!(status = IoCreateDevice( driver, 0, &nameW, 0, 0, FALSE, &device )))
 306         status = IoCreateSymbolicLink( &linkW, &nameW );
 307     if (status)
 308     {
 309         FIXME( "failed to create device error %x\n", status );
 310         return status;
 311     }
 312
 313     create_drive_mount_points( driver );
 314
 315     return status;
 316 }
 317
 318 /* main entry point for the mount point manager driver */
 319 NTSTATUS WINAPI DriverEntry( DRIVER_OBJECT *driver, UNICODE_STRING *path )
 320 {
 321     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};
 322     static const WCHAR link_mountmgrW[] = {'\\','?','?','\\','M','o','u','n','t','P','o','i','n','t','M','a','n','a','g','e','r',0};
 323     static const WCHAR harddiskW[] = {'\\','D','r','i','v','e','r','\\','H','a','r','d','d','i','s','k',0};
 324
 325     UNICODE_STRING nameW, linkW;
 326     DEVICE_OBJECT *device;
 327     NTSTATUS status;
 328
 329     TRACE( "%s\n", debugstr_w(path->Buffer) );
 330
 331     driver->MajorFunction[IRP_MJ_DEVICE_CONTROL] = mountmgr_ioctl;
 332
 333     RtlInitUnicodeString( &nameW, device_mountmgrW );
 334     RtlInitUnicodeString( &linkW, link_mountmgrW );
 335     if (!(status = IoCreateDevice( driver, 0, &nameW, 0, 0, FALSE, &device )))
 336         status = IoCreateSymbolicLink( &linkW, &nameW );
 337     if (status)
 338     {
 339         FIXME( "failed to create device error %x\n", status );
 340         return status;
 341     }
 342
 343     RtlInitUnicodeString( &nameW, harddiskW );
 344     status = IoCreateDriver( &nameW, harddisk_driver_entry );
 345
 346     return status;
 347 }