/*
    This is a virtual disk driver for Windows NT/2000/XP that uses
    one or more files to emulate physical disks.
    Copyright (C) 1999-2004 Bo Brant閚.
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.
    This program 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 General Public License for more details.
    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include <ntddk.h>
#include <ntdddisk.h>
#include <ntddcdrm.h>
#include <ntverp.h>

//
// We include some stuff from newer DDK:s here so that one
// version of the driver for all versions of Windows can
// be compiled with the Windows NT 4.0 DDK.
//
#if (VER_PRODUCTBUILD < 2195)

#define FILE_DEVICE_MASS_STORAGE            0x0000002d
#define IOCTL_STORAGE_CHECK_VERIFY2         CTL_CODE(IOCTL_STORAGE_BASE, 0x0200, METHOD_BUFFERED, FILE_ANY_ACCESS)
#define FILE_ATTRIBUTE_ENCRYPTED            0x00004000

#endif

#if (VER_PRODUCTBUILD < 2600)

#define IOCTL_DISK_GET_PARTITION_INFO_EX    CTL_CODE(IOCTL_DISK_BASE, 0x0012, METHOD_BUFFERED, FILE_ANY_ACCESS)
#define IOCTL_DISK_GET_LENGTH_INFO          CTL_CODE(IOCTL_DISK_BASE, 0x0017, METHOD_BUFFERED, FILE_READ_ACCESS)

typedef enum _PARTITION_STYLE {
    PARTITION_STYLE_MBR,
    PARTITION_STYLE_GPT
} PARTITION_STYLE;

typedef unsigned __int64 ULONG64, *PULONG64;

typedef struct _PARTITION_INFORMATION_MBR {
    UCHAR   PartitionType;
    BOOLEAN BootIndicator;
    BOOLEAN RecognizedPartition;
    ULONG   HiddenSectors;
} PARTITION_INFORMATION_MBR, *PPARTITION_INFORMATION_MBR;

typedef struct _PARTITION_INFORMATION_GPT {
    GUID    PartitionType;
    GUID    PartitionId;
    ULONG64 Attributes;
    WCHAR   Name[36];
} PARTITION_INFORMATION_GPT, *PPARTITION_INFORMATION_GPT;

typedef struct _PARTITION_INFORMATION_EX {
    PARTITION_STYLE PartitionStyle;
    LARGE_INTEGER   StartingOffset;
    LARGE_INTEGER   PartitionLength;
    ULONG           PartitionNumber;
    BOOLEAN         RewritePartition;
    union {
        PARTITION_INFORMATION_MBR Mbr;
        PARTITION_INFORMATION_GPT Gpt;
    };
} PARTITION_INFORMATION_EX, *PPARTITION_INFORMATION_EX;

typedef struct _GET_LENGTH_INFORMATION {
    LARGE_INTEGER Length;
} GET_LENGTH_INFORMATION, *PGET_LENGTH_INFORMATION;

#endif // (VER_PRODUCTBUILD < 2600)

//
// We include some stuff from ntifs.h here so that
// the driver can be compiled with only the DDK.
//

#define TOKEN_SOURCE_LENGTH 8

typedef enum _TOKEN_TYPE {
    TokenPrimary = 1,
    TokenImpersonation
} TOKEN_TYPE;

typedef struct _TOKEN_SOURCE {
    CCHAR   SourceName[TOKEN_SOURCE_LENGTH];
    LUID    SourceIdentifier;
} TOKEN_SOURCE, *PTOKEN_SOURCE;

typedef struct _TOKEN_CONTROL {
    LUID            TokenId;
    LUID            AuthenticationId;
    LUID            ModifiedId;
    TOKEN_SOURCE    TokenSource;
} TOKEN_CONTROL, *PTOKEN_CONTROL;

typedef struct _SECURITY_CLIENT_CONTEXT {
    SECURITY_QUALITY_OF_SERVICE SecurityQos;
    PACCESS_TOKEN               ClientToken;
    BOOLEAN                     DirectlyAccessClientToken;
    BOOLEAN                     DirectAccessEffectiveOnly;
    BOOLEAN                     ServerIsRemote;
    TOKEN_CONTROL               ClientTokenControl;
} SECURITY_CLIENT_CONTEXT, *PSECURITY_CLIENT_CONTEXT;

#define PsDereferenceImpersonationToken(T)  \
            {if (ARGUMENT_PRESENT(T)) {     \
                (ObDereferenceObject((T))); \
            } else {                        \
                ;                           \
            }                               \
}

#define PsDereferencePrimaryToken(T) (ObDereferenceObject((T)))

NTKERNELAPI
VOID
PsRevertToSelf (
    VOID
);

NTKERNELAPI
NTSTATUS
SeCreateClientSecurity (
    IN PETHREAD                     Thread,
    IN PSECURITY_QUALITY_OF_SERVICE QualityOfService,
    IN BOOLEAN                      RemoteClient,
    OUT PSECURITY_CLIENT_CONTEXT    ClientContext
);

#define SeDeleteClientSecurity(C)  {                                           \
            if (SeTokenType((C)->ClientToken) == TokenPrimary) {               \
                PsDereferencePrimaryToken( (C)->ClientToken );                 \
            } else {                                                           \
                PsDereferenceImpersonationToken( (C)->ClientToken );           \
            }                                                                  \
}

NTKERNELAPI
VOID
SeImpersonateClient (
    IN PSECURITY_CLIENT_CONTEXT ClientContext,
    IN PETHREAD                 ServerThread OPTIONAL
);

NTKERNELAPI
TOKEN_TYPE
SeTokenType (
    IN PACCESS_TOKEN Token
);

//
// For backward compatibility with Windows NT 4.0 by Bruce Engle.
//
#ifndef MmGetSystemAddressForMdlSafe
#define MmGetSystemAddressForMdlSafe(MDL, PRIORITY) MmGetSystemAddressForMdlPrettySafe(MDL)

PVOID
MmGetSystemAddressForMdlPrettySafe (
    PMDL Mdl
    )
{
    CSHORT  MdlMappingCanFail;
    PVOID   MappedSystemVa;

    MdlMappingCanFail = Mdl->MdlFlags & MDL_MAPPING_CAN_FAIL;

    Mdl->MdlFlags |= MDL_MAPPING_CAN_FAIL;

    MappedSystemVa = MmGetSystemAddressForMdl(Mdl);

    if (MdlMappingCanFail == 0)
    {
        Mdl->MdlFlags &= ~MDL_MAPPING_CAN_FAIL;
    }

    return MappedSystemVa;
}
#endif

#include "filedisk.h"

#define PARAMETER_KEY           L"\\Parameters"

#define NUMBEROFDEVICES_VALUE   L"NumberOfDevices"

#define DEFAULT_NUMBEROFDEVICES 4

#define SECTOR_SIZE             512

#define TOC_DATA_TRACK          0x04

HANDLE dir_handle;

typedef struct _DEVICE_EXTENSION {
    BOOLEAN                     media_in_device;
    HANDLE                      file_handle;
    ANSI_STRING                 file_name;
    LARGE_INTEGER               file_size;
    BOOLEAN                     read_only;
    PSECURITY_CLIENT_CONTEXT    security_client_context;
    LIST_ENTRY                  list_head;
    KSPIN_LOCK                  list_lock;
    KEVENT                      request_event;
    PVOID                       thread_pointer;
    BOOLEAN                     terminate_thread;
} DEVICE_EXTENSION, *PDEVICE_EXTENSION;

NTSTATUS
DriverEntry (
    IN PDRIVER_OBJECT   DriverObject,
    IN PUNICODE_STRING  RegistryPath
);

NTSTATUS
FileDiskCreateDevice (
    IN PDRIVER_OBJECT   DriverObject,
    IN ULONG            Number,
    IN DEVICE_TYPE      DeviceType
);

VOID
FileDiskUnload (
    IN PDRIVER_OBJECT   DriverObject
);

PDEVICE_OBJECT
FileDiskDeleteDevice (
    IN PDEVICE_OBJECT   DeviceObject
);

NTSTATUS
FileDiskCreateClose (
    IN PDEVICE_OBJECT   DeviceObject,
    IN PIRP             Irp
);

NTSTATUS
FileDiskReadWrite (
    IN PDEVICE_OBJECT   DeviceObject,
    IN PIRP             Irp
);

NTSTATUS
FileDiskDeviceControl (
    IN PDEVICE_OBJECT   DeviceObject,
    IN PIRP             Irp
);

VOID
FileDiskThread (
    IN PVOID            Context
);

NTSTATUS
FileDiskOpenFile (
    IN PDEVICE_OBJECT   DeviceObject,
    IN PIRP             Irp
);

NTSTATUS
FileDiskCloseFile (
    IN PDEVICE_OBJECT   DeviceObject,
    IN PIRP             Irp
);

int swprintf(wchar_t *, const wchar_t *, ...);

#pragma code_seg("INIT")

NTSTATUS
DriverEntry (
    IN PDRIVER_OBJECT   DriverObject,
    IN PUNICODE_STRING  RegistryPath
    )
{
    UNICODE_STRING              parameter_path;
    RTL_QUERY_REGISTRY_TABLE    query_table[2];
    ULONG                       n_devices;
    NTSTATUS                    status;
    UNICODE_STRING              device_dir_name;
    OBJECT_ATTRIBUTES           object_attributes;
    ULONG                       n;
    USHORT                      n_created_devices;

    parameter_path.Length = 0;

    parameter_path.MaximumLength = RegistryPath->Length + sizeof(PARAMETER_KEY);

    parameter_path.Buffer = (PWSTR) ExAllocatePool(PagedPool, parameter_path.MaximumLength);

    if (parameter_path.Buffer == NULL)
    {
        return STATUS_INSUFFICIENT_RESOURCES;
    }

    RtlCopyUnicodeString(&parameter_path, RegistryPath);

    RtlAppendUnicodeToString(&parameter_path, PARAMETER_KEY);

    RtlZeroMemory(&query_table[0], sizeof(query_table));

    query_table[0].Flags = RTL_QUERY_REGISTRY_DIRECT | RTL_QUERY_REGISTRY_REQUIRED;
    query_table[0].Name = NUMBEROFDEVICES_VALUE;
    query_table[0].EntryContext = &n_devices;

    status = RtlQueryRegistryValues(
        RTL_REGISTRY_ABSOLUTE,
        parameter_path.Buffer,
        &query_table[0],
        NULL,
        NULL
        );

    ExFreePool(parameter_path.Buffer);

    if (!NT_SUCCESS(status))
    {
        KdPrint(("FileDisk: Query registry failed, using default values.\n"));
        n_devices = DEFAULT_NUMBEROFDEVICES;
    }

    RtlInitUnicodeString(&device_dir_name, DEVICE_DIR_NAME);

    InitializeObjectAttributes(
        &object_attributes,
        &device_dir_name,
        OBJ_PERMANENT,
        NULL,
        NULL
        );

    status = ZwCreateDirectoryObject(
        &dir_handle,
        DIRECTORY_ALL_ACCESS,
        &object_attributes
        );

    if (!NT_SUCCESS(status))
    {
        return status;
    }

    ZwMakeTemporaryObject(dir_handle);

    for (n = 0, n_created_devices = 0; n < n_devices; n++)
    {
        status = FileDiskCreateDevice(DriverObject, n, FILE_DEVICE_DISK);

        if (NT_SUCCESS(status))
        {
            n_created_devices++;
        }
    }

    for (n = 0; n < n_devices; n++)
    {
        status = FileDiskCreateDevice(DriverObject, n, FILE_DEVICE_CD_ROM);

        if (NT_SUCCESS(status))
        {
            n_created_devices++;
        }
    }

    if (n_created_devices == 0)
    {
        ZwClose(dir_handle);
        return status;
    }

    DriverObject->MajorFunction[IRP_MJ_CREATE]         = FileDiskCreateClose;
    DriverObject->MajorFunction[IRP_MJ_CLOSE]          = FileDiskCreateClose;
    DriverObject->MajorFunction[IRP_MJ_READ]           = FileDiskReadWrite;
    DriverObject->MajorFunction[IRP_MJ_WRITE]          = FileDiskReadWrite;
    DriverObject->MajorFunction[IRP_MJ_DEVICE_CONTROL] = FileDiskDeviceControl;

    DriverObject->DriverUnload = FileDiskUnload;

    return STATUS_SUCCESS;
}

NTSTATUS
FileDiskCreateDevice (
    IN PDRIVER_OBJECT   DriverObject,
    IN ULONG            Number,
    IN DEVICE_TYPE      DeviceType
    )
{
    WCHAR               device_name_buffer[MAXIMUM_FILENAME_LENGTH];
    UNICODE_STRING      device_name;
    NTSTATUS            status;
    PDEVICE_OBJECT      device_object;
    PDEVICE_EXTENSION   device_extension;
    HANDLE              thread_handle;

    ASSERT(DriverObject != NULL);

    if (DeviceType == FILE_DEVICE_CD_ROM)
    {
        swprintf(
            device_name_buffer,
            DEVICE_NAME_PREFIX L"Cd" L"%u",
            Number
            );
    }
    else
    {
        swprintf(
            device_name_buffer,
            DEVICE_NAME_PREFIX L"%u",
            Number
            );
    }

    RtlInitUnicodeString(&device_name, device_name_buffer);

    status = IoCreateDevice(
        DriverObject,
        sizeof(DEVICE_EXTENSION),
        &device_name,
        DeviceType,
        0,
        FALSE,
        &device_object
        );

    if (!NT_SUCCESS(status))
    {
        return status;
    }

    device_object->Flags |= DO_DIRECT_IO;

    device_extension = (PDEVICE_EXTENSION) device_object->DeviceExtension;

    device_extension->media_in_device = FALSE;

    if (DeviceType == FILE_DEVICE_CD_ROM)
    {
        device_object->Characteristics |= FILE_READ_ONLY_DEVICE;
        device_extension->read_only = TRUE;
    }

    InitializeListHead(&device_extension->list_head);

    KeInitializeSpinLock(&device_extension->list_lock);

    KeInitializeEvent(
        &device_extension->request_event,
        SynchronizationEvent,
        FALSE
        );

    device_extension->terminate_thread = FALSE;

    status = PsCreateSystemThread(
        &thread_handle,
        (ACCESS_MASK) 0L,
        NULL,
        NULL,
        NULL,
        FileDiskThread,
        device_object
        );

    if (!NT_SUCCESS(status))
    {
        IoDeleteDevice(device_object);
        return status;
    }