Sweden-Number/dlls/mountmgr.sys/mountmgr.c

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/*
* Mount manager service implementation
*
* Copyright 2008 Alexandre Julliard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <stdarg.h>
#include <unistd.h>
#define NONAMELESSUNION
#define NONAMELESSSTRUCT
#include "mountmgr.h"
#include "winreg.h"
#include "wine/library.h"
#include "wine/list.h"
#include "wine/unicode.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(mountmgr);
#define MIN_ID_LEN 4
struct mount_point
{
struct list entry; /* entry in mount points list */
DEVICE_OBJECT *device; /* disk device */
UNICODE_STRING name; /* device name */
UNICODE_STRING link; /* DOS device symlink */
void *id; /* device unique id */
unsigned int id_len;
};
static struct list mount_points_list = LIST_INIT(mount_points_list);
static HKEY mount_key;
void set_mount_point_id( struct mount_point *mount, const void *id, unsigned int id_len )
{
RtlFreeHeap( GetProcessHeap(), 0, mount->id );
mount->id_len = max( MIN_ID_LEN, id_len );
if ((mount->id = RtlAllocateHeap( GetProcessHeap(), HEAP_ZERO_MEMORY, mount->id_len )))
{
memcpy( mount->id, id, id_len );
RegSetValueExW( mount_key, mount->link.Buffer, 0, REG_BINARY, mount->id, mount->id_len );
}
else mount->id_len = 0;
}
static struct mount_point *add_mount_point( DEVICE_OBJECT *device, UNICODE_STRING *device_name,
const WCHAR *link )
{
struct mount_point *mount;
WCHAR *str;
UINT len = (strlenW(link) + 1) * sizeof(WCHAR) + device_name->Length + sizeof(WCHAR);
if (!(mount = RtlAllocateHeap( GetProcessHeap(), 0, sizeof(*mount) + len ))) return NULL;
str = (WCHAR *)(mount + 1);
strcpyW( str, link );
RtlInitUnicodeString( &mount->link, str );
str += strlenW(str) + 1;
memcpy( str, device_name->Buffer, device_name->Length );
str[device_name->Length / sizeof(WCHAR)] = 0;
mount->name.Buffer = str;
mount->name.Length = device_name->Length;
mount->name.MaximumLength = device_name->Length + sizeof(WCHAR);
mount->device = device;
mount->id = NULL;
list_add_tail( &mount_points_list, &mount->entry );
IoCreateSymbolicLink( &mount->link, device_name );
TRACE( "created %s id %s for %s\n", debugstr_w(mount->link.Buffer),
debugstr_a(mount->id), debugstr_w(mount->name.Buffer) );
return mount;
}
/* create the DosDevices mount point symlink for a new device */
struct mount_point *add_dosdev_mount_point( DEVICE_OBJECT *device, UNICODE_STRING *device_name, int drive )
{
static const WCHAR driveW[] = {'\\','D','o','s','D','e','v','i','c','e','s','\\','%','c',':',0};
WCHAR link[sizeof(driveW)];
sprintfW( link, driveW, 'A' + drive );
return add_mount_point( device, device_name, link );
}
/* create the Volume mount point symlink for a new device */
struct mount_point *add_volume_mount_point( DEVICE_OBJECT *device, UNICODE_STRING *device_name,
const GUID *guid )
{
static const WCHAR volumeW[] = {'\\','?','?','\\','V','o','l','u','m','e','{',
'%','0','8','x','-','%','0','4','x','-','%','0','4','x','-',
'%','0','2','x','%','0','2','x','-','%','0','2','x','%','0','2','x',
'%','0','2','x','%','0','2','x','%','0','2','x','%','0','2','x','}',0};
WCHAR link[sizeof(volumeW)];
sprintfW( link, volumeW, guid->Data1, guid->Data2, guid->Data3,
guid->Data4[0], guid->Data4[1], guid->Data4[2], guid->Data4[3],
guid->Data4[4], guid->Data4[5], guid->Data4[6], guid->Data4[7]);
return add_mount_point( device, device_name, link );
}
/* delete the mount point symlinks when a device goes away */
void delete_mount_point( struct mount_point *mount )
{
TRACE( "deleting %s\n", debugstr_w(mount->link.Buffer) );
list_remove( &mount->entry );
RegDeleteValueW( mount_key, mount->link.Buffer );
IoDeleteSymbolicLink( &mount->link );
RtlFreeHeap( GetProcessHeap(), 0, mount->id );
RtlFreeHeap( GetProcessHeap(), 0, mount );
}
/* check if a given mount point matches the requested specs */
static BOOL matching_mount_point( const struct mount_point *mount, const MOUNTMGR_MOUNT_POINT *spec )
{
if (spec->SymbolicLinkNameOffset)
{
const WCHAR *name = (const WCHAR *)((const char *)spec + spec->SymbolicLinkNameOffset);
if (spec->SymbolicLinkNameLength != mount->link.Length) return FALSE;
if (memicmpW( name, mount->link.Buffer, mount->link.Length/sizeof(WCHAR)))
return FALSE;
}
if (spec->DeviceNameOffset)
{
const WCHAR *name = (const WCHAR *)((const char *)spec + spec->DeviceNameOffset);
if (spec->DeviceNameLength != mount->name.Length) return FALSE;
if (memicmpW( name, mount->name.Buffer, mount->name.Length/sizeof(WCHAR)))
return FALSE;
}
if (spec->UniqueIdOffset)
{
const void *id = ((const char *)spec + spec->UniqueIdOffset);
if (spec->UniqueIdLength != mount->id_len) return FALSE;
if (memcmp( id, mount->id, mount->id_len )) return FALSE;
}
return TRUE;
}
/* implementation of IOCTL_MOUNTMGR_QUERY_POINTS */
static NTSTATUS query_mount_points( const void *in_buff, SIZE_T insize,
void *out_buff, SIZE_T outsize, IO_STATUS_BLOCK *iosb )
{
UINT count, pos, size;
const MOUNTMGR_MOUNT_POINT *input = in_buff;
MOUNTMGR_MOUNT_POINTS *info = out_buff;
struct mount_point *mount;
/* sanity checks */
if (input->SymbolicLinkNameOffset + input->SymbolicLinkNameLength > insize ||
input->UniqueIdOffset + input->UniqueIdLength > insize ||
input->DeviceNameOffset + input->DeviceNameLength > insize ||
input->SymbolicLinkNameOffset + input->SymbolicLinkNameLength < input->SymbolicLinkNameOffset ||
input->UniqueIdOffset + input->UniqueIdLength < input->UniqueIdOffset ||
input->DeviceNameOffset + input->DeviceNameLength < input->DeviceNameOffset)
return STATUS_INVALID_PARAMETER;
count = size = 0;
LIST_FOR_EACH_ENTRY( mount, &mount_points_list, struct mount_point, entry )
{
if (!matching_mount_point( mount, input )) continue;
size += mount->name.Length;
size += mount->link.Length;
size += mount->id_len;
size = (size + sizeof(WCHAR) - 1) & ~(sizeof(WCHAR) - 1);
count++;
}
pos = FIELD_OFFSET( MOUNTMGR_MOUNT_POINTS, MountPoints[count] );
size += pos;
if (size > outsize)
{
if (size >= sizeof(info->Size)) info->Size = size;
iosb->Information = sizeof(info->Size);
return STATUS_MORE_ENTRIES;
}
info->NumberOfMountPoints = count;
count = 0;
LIST_FOR_EACH_ENTRY( mount, &mount_points_list, struct mount_point, entry )
{
if (!matching_mount_point( mount, input )) continue;
info->MountPoints[count].DeviceNameOffset = pos;
info->MountPoints[count].DeviceNameLength = mount->name.Length;
memcpy( (char *)out_buff + pos, mount->name.Buffer, mount->name.Length );
pos += mount->name.Length;
info->MountPoints[count].SymbolicLinkNameOffset = pos;
info->MountPoints[count].SymbolicLinkNameLength = mount->link.Length;
memcpy( (char *)out_buff + pos, mount->link.Buffer, mount->link.Length );
pos += mount->link.Length;
info->MountPoints[count].UniqueIdOffset = pos;
info->MountPoints[count].UniqueIdLength = mount->id_len;
memcpy( (char *)out_buff + pos, mount->id, mount->id_len );
pos += mount->id_len;
pos = (pos + sizeof(WCHAR) - 1) & ~(sizeof(WCHAR) - 1);
count++;
}
info->Size = pos;
iosb->Information = pos;
return STATUS_SUCCESS;
}
/* implementation of IOCTL_MOUNTMGR_DEFINE_UNIX_DRIVE */
static NTSTATUS define_unix_drive( const void *in_buff, SIZE_T insize )
{
const struct mountmgr_unix_drive *input = in_buff;
const char *mount_point = NULL, *device = NULL;
unsigned int i;
WCHAR letter = tolowerW( input->letter );
if (letter < 'a' || letter > 'z') return STATUS_INVALID_PARAMETER;
if (input->type > DRIVE_RAMDISK) return STATUS_INVALID_PARAMETER;
if (input->mount_point_offset > insize || input->device_offset > insize)
return STATUS_INVALID_PARAMETER;
/* make sure string are null-terminated */
if (input->mount_point_offset)
{
mount_point = (const char *)in_buff + input->mount_point_offset;
for (i = input->mount_point_offset; i < insize; i++)
if (!*((const char *)in_buff + i)) break;
if (i >= insize) return STATUS_INVALID_PARAMETER;
}
if (input->device_offset)
{
device = (const char *)in_buff + input->device_offset;
for (i = input->device_offset; i < insize; i++)
if (!*((const char *)in_buff + i)) break;
if (i >= insize) return STATUS_INVALID_PARAMETER;
}
if (input->type != DRIVE_NO_ROOT_DIR)
{
enum device_type type = DEVICE_UNKNOWN;
TRACE( "defining %c: dev %s mount %s type %u\n",
letter, debugstr_a(device), debugstr_a(mount_point), input->type );
switch (input->type)
{
case DRIVE_REMOVABLE: type = (letter >= 'c') ? DEVICE_HARDDISK : DEVICE_FLOPPY; break;
case DRIVE_REMOTE: type = DEVICE_NETWORK; break;
case DRIVE_CDROM: type = DEVICE_CDROM; break;
case DRIVE_RAMDISK: type = DEVICE_RAMDISK; break;
case DRIVE_FIXED: type = DEVICE_HARDDISK_VOL; break;
}
return add_dos_device( letter - 'a', NULL, device, mount_point, type, NULL );
}
else
{
TRACE( "removing %c:\n", letter );
return remove_dos_device( letter - 'a', NULL );
}
}
/* implementation of IOCTL_MOUNTMGR_QUERY_UNIX_DRIVE */
static NTSTATUS query_unix_drive( const void *in_buff, SIZE_T insize,
void *out_buff, SIZE_T outsize, IO_STATUS_BLOCK *iosb )
{
const struct mountmgr_unix_drive *input = in_buff;
struct mountmgr_unix_drive *output = out_buff;
char *device, *mount_point;
int letter = tolowerW( input->letter );
NTSTATUS status;
DWORD size, type = DEVICE_UNKNOWN;
enum device_type device_type;
char *ptr;
if (letter < 'a' || letter > 'z') return STATUS_INVALID_PARAMETER;
if ((status = query_dos_device( letter - 'a', &device_type, &device, &mount_point ))) return status;
switch (device_type)
{
case DEVICE_UNKNOWN: type = DRIVE_UNKNOWN; break;
case DEVICE_HARDDISK: type = DRIVE_REMOVABLE; break;
case DEVICE_HARDDISK_VOL: type = DRIVE_FIXED; break;
case DEVICE_FLOPPY: type = DRIVE_REMOVABLE; break;
case DEVICE_CDROM: type = DRIVE_CDROM; break;
case DEVICE_NETWORK: type = DRIVE_REMOTE; break;
case DEVICE_RAMDISK: type = DRIVE_RAMDISK; break;
}
size = sizeof(*output);
if (device) size += strlen(device) + 1;
if (mount_point) size += strlen(mount_point) + 1;
if (size > outsize)
{
iosb->Information = 0;
if (size >= FIELD_OFFSET( struct mountmgr_unix_drive, size ) + sizeof(output->size))
{
output->size = size;
iosb->Information = FIELD_OFFSET( struct mountmgr_unix_drive, size ) + sizeof(output->size);
}
if (size >= FIELD_OFFSET( struct mountmgr_unix_drive, type ) + sizeof(output->type))
{
output->type = type;
iosb->Information = FIELD_OFFSET( struct mountmgr_unix_drive, type ) + sizeof(output->type);
}
status = STATUS_MORE_ENTRIES;
goto done;
}
output->size = size;
output->letter = letter;
output->type = type;
ptr = (char *)(output + 1);
if (mount_point)
{
output->mount_point_offset = ptr - (char *)output;
strcpy( ptr, mount_point );
ptr += strlen(ptr) + 1;
}
else output->mount_point_offset = 0;
if (device)
{
output->device_offset = ptr - (char *)output;
strcpy( ptr, device );
ptr += strlen(ptr) + 1;
}
else output->device_offset = 0;
TRACE( "returning %c: dev %s mount %s type %u\n",
letter, debugstr_a(device), debugstr_a(mount_point), type );
iosb->Information = ptr - (char *)output;
done:
RtlFreeHeap( GetProcessHeap(), 0, device );
RtlFreeHeap( GetProcessHeap(), 0, mount_point );
return status;
}
/* handler for ioctls on the mount manager device */
static NTSTATUS WINAPI mountmgr_ioctl( DEVICE_OBJECT *device, IRP *irp )
{
IO_STACK_LOCATION *irpsp = irp->Tail.Overlay.s.u.CurrentStackLocation;
TRACE( "ioctl %x insize %u outsize %u\n",
irpsp->Parameters.DeviceIoControl.IoControlCode,
irpsp->Parameters.DeviceIoControl.InputBufferLength,
irpsp->Parameters.DeviceIoControl.OutputBufferLength );
switch(irpsp->Parameters.DeviceIoControl.IoControlCode)
{
case IOCTL_MOUNTMGR_QUERY_POINTS:
if (irpsp->Parameters.DeviceIoControl.InputBufferLength < sizeof(MOUNTMGR_MOUNT_POINT))
return STATUS_INVALID_PARAMETER;
irp->IoStatus.u.Status = query_mount_points( irpsp->Parameters.DeviceIoControl.Type3InputBuffer,
irpsp->Parameters.DeviceIoControl.InputBufferLength,
irp->MdlAddress->StartVa,
irpsp->Parameters.DeviceIoControl.OutputBufferLength,
&irp->IoStatus );
break;
case IOCTL_MOUNTMGR_DEFINE_UNIX_DRIVE:
if (irpsp->Parameters.DeviceIoControl.InputBufferLength < sizeof(struct mountmgr_unix_drive))
return STATUS_INVALID_PARAMETER;
irp->IoStatus.Information = 0;
irp->IoStatus.u.Status = define_unix_drive( irpsp->Parameters.DeviceIoControl.Type3InputBuffer,
irpsp->Parameters.DeviceIoControl.InputBufferLength );
break;
case IOCTL_MOUNTMGR_QUERY_UNIX_DRIVE:
if (irpsp->Parameters.DeviceIoControl.InputBufferLength < sizeof(struct mountmgr_unix_drive))
return STATUS_INVALID_PARAMETER;
irp->IoStatus.u.Status = query_unix_drive( irpsp->Parameters.DeviceIoControl.Type3InputBuffer,
irpsp->Parameters.DeviceIoControl.InputBufferLength,
irp->MdlAddress->StartVa,
irpsp->Parameters.DeviceIoControl.OutputBufferLength,
&irp->IoStatus );
break;
default:
FIXME( "ioctl %x not supported\n", irpsp->Parameters.DeviceIoControl.IoControlCode );
irp->IoStatus.u.Status = STATUS_NOT_SUPPORTED;
break;
}
return irp->IoStatus.u.Status;
}
/* main entry point for the mount point manager driver */
NTSTATUS WINAPI DriverEntry( DRIVER_OBJECT *driver, UNICODE_STRING *path )
{
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};
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};
static const WCHAR link_mountmgrW[] = {'\\','?','?','\\','M','o','u','n','t','P','o','i','n','t','M','a','n','a','g','e','r',0};
static const WCHAR harddiskW[] = {'\\','D','r','i','v','e','r','\\','H','a','r','d','d','i','s','k',0};
UNICODE_STRING nameW, linkW;
DEVICE_OBJECT *device;
NTSTATUS status;
TRACE( "%s\n", debugstr_w(path->Buffer) );
driver->MajorFunction[IRP_MJ_DEVICE_CONTROL] = mountmgr_ioctl;
RtlInitUnicodeString( &nameW, device_mountmgrW );
RtlInitUnicodeString( &linkW, link_mountmgrW );
if (!(status = IoCreateDevice( driver, 0, &nameW, 0, 0, FALSE, &device )))
status = IoCreateSymbolicLink( &linkW, &nameW );
if (status)
{
FIXME( "failed to create device error %x\n", status );
return status;
}
RegCreateKeyExW( HKEY_LOCAL_MACHINE, mounted_devicesW, 0, NULL,
REG_OPTION_VOLATILE, KEY_ALL_ACCESS, NULL, &mount_key, NULL );
RtlInitUnicodeString( &nameW, harddiskW );
status = IoCreateDriver( &nameW, harddisk_driver_entry );
initialize_hal();
initialize_diskarbitration();
return status;
}