winfsp/src/dll/create.c

/**
 * @file dll/create.c
 *
 * @copyright 2015 Bill Zissimopoulos
 */

#include <dll/library.h>

static NTSTATUS FspFileSystemOpCreate_FileCreate(FSP_FILE_SYSTEM *FileSystem,
    FSP_FSCTL_TRANSACT_REQ *Request)
{
    NTSTATUS Result;
    DWORD GrantedAccess;
    FSP_FILE_NODE *FileNode;
    FSP_FSCTL_TRANSACT_RSP Response;

    Result = FspAccessCheck(FileSystem, Request, TRUE,
        (Request->Req.Create.CreateOptions & FILE_DIRECTORY_FILE) ?
            FILE_ADD_SUBDIRECTORY : FILE_ADD_FILE,
        &GrantedAccess);
    if (!NT_SUCCESS(Result))
        return FspFileSystemSendResponseWithStatus(FileSystem, Request, Result);

    Result = FileSystem->Interface->FileCreate(FileSystem, Request, &FileNode);
    if (!NT_SUCCESS(Result))
        return FspFileSystemSendResponseWithStatus(FileSystem, Request, Result);

    memset(&FileNode->ShareAccess, 0, sizeof FileNode->ShareAccess);
    FspShareCheck(FileSystem, GrantedAccess, Request->Req.Create.ShareAccess, FileNode);

    memset(&Response, 0, sizeof Response);
    Response.Size = sizeof Response;
    Response.Kind = Request->Kind;
    Response.Hint = Request->Hint;
    Response.IoStatus.Status = STATUS_SUCCESS;
    Response.IoStatus.Information = FILE_CREATED;
    Response.Rsp.Create.Opened.UserContext = (UINT_PTR)FileNode;
    Response.Rsp.Create.Opened.GrantedAccess = GrantedAccess;
    return FspFileSystemSendResponse(FileSystem, &Response);
}

static NTSTATUS FspFileSystemOpCreate_FileOpen(FSP_FILE_SYSTEM *FileSystem,
    FSP_FSCTL_TRANSACT_REQ *Request)
{
    NTSTATUS Result;
    DWORD GrantedAccess;
    FSP_FILE_NODE *FileNode;
    FSP_FSCTL_TRANSACT_RSP Response;

    Result = FspAccessCheck(FileSystem, Request, TRUE,
        Request->Req.Create.DesiredAccess, &GrantedAccess);
    if (!NT_SUCCESS(Result))
        return FspFileSystemSendResponseWithStatus(FileSystem, Request, Result);

    Result = FileSystem->Interface->FileOpen(FileSystem, Request, &FileNode);
    if (!NT_SUCCESS(Result))
        return FspFileSystemSendResponseWithStatus(FileSystem, Request, Result);

    Result = FspShareCheck(FileSystem, GrantedAccess, Request->Req.Create.ShareAccess, FileNode);
    if (!NT_SUCCESS(Result))
    {
        if (0 != FileSystem->Interface->FileClose)
            FileSystem->Interface->FileClose(FileSystem, Request, FileNode);
        return FspFileSystemSendResponseWithStatus(FileSystem, Request, Result);
    }

    memset(&Response, 0, sizeof Response);
    Response.Size = sizeof Response;
    Response.Kind = Request->Kind;
    Response.Hint = Request->Hint;
    Response.IoStatus.Status = STATUS_SUCCESS;
    Response.IoStatus.Information = FILE_OPENED;
    Response.Rsp.Create.Opened.UserContext = (UINT_PTR)FileNode;
    Response.Rsp.Create.Opened.GrantedAccess = GrantedAccess;
    return FspFileSystemSendResponse(FileSystem, &Response);
}

static NTSTATUS FspFileSystemOpCreate_FileOpenIf(FSP_FILE_SYSTEM *FileSystem,
    FSP_FSCTL_TRANSACT_REQ *Request)
{
    NTSTATUS Result;
    DWORD GrantedAccess;
    FSP_FILE_NODE *FileNode;
    FSP_FSCTL_TRANSACT_RSP Response;
    BOOLEAN Create = FALSE;

    Result = FspAccessCheck(FileSystem, Request, TRUE,
        Request->Req.Create.DesiredAccess, &GrantedAccess);
    if (!NT_SUCCESS(Result))
    {
        if (STATUS_OBJECT_NAME_NOT_FOUND != Result)
            return FspFileSystemSendResponseWithStatus(FileSystem, Request, Result);
        Create = TRUE;
    }

    if (!Create)
    {
        Result = FileSystem->Interface->FileOpen(FileSystem, Request, &FileNode);
        if (!NT_SUCCESS(Result))
        {
            if (STATUS_OBJECT_NAME_NOT_FOUND != Result)
                return FspFileSystemSendResponseWithStatus(FileSystem, Request, Result);
            Create = TRUE;
        }
    }

    if (Create)
    {
        Result = FspAccessCheck(FileSystem, Request, FALSE,
            (Request->Req.Create.CreateOptions & FILE_DIRECTORY_FILE) ?
                FILE_ADD_SUBDIRECTORY : FILE_ADD_FILE,
            &GrantedAccess);
        if (!NT_SUCCESS(Result))
            return FspFileSystemSendResponseWithStatus(FileSystem, Request, Result);

        Result = FileSystem->Interface->FileCreate(FileSystem, Request, &FileNode);
        if (!NT_SUCCESS(Result))
            return FspFileSystemSendResponseWithStatus(FileSystem, Request, Result);

        memset(&FileNode->ShareAccess, 0, sizeof FileNode->ShareAccess);
    }

    Result = FspShareCheck(FileSystem, GrantedAccess, Request->Req.Create.ShareAccess, FileNode);
    if (!NT_SUCCESS(Result))
    {
        if (0 != FileSystem->Interface->FileClose)
            FileSystem->Interface->FileClose(FileSystem, Request, FileNode);
        return FspFileSystemSendResponseWithStatus(FileSystem, Request, Result);
    }

    memset(&Response, 0, sizeof Response);
    Response.Size = sizeof Response;
    Response.Kind = Request->Kind;
    Response.Hint = Request->Hint;
    Response.IoStatus.Status = STATUS_SUCCESS;
    Response.IoStatus.Information = Create ? FILE_CREATED : FILE_OPENED;
    Response.Rsp.Create.Opened.UserContext = (UINT_PTR)FileNode;
    Response.Rsp.Create.Opened.GrantedAccess = GrantedAccess;
    return FspFileSystemSendResponse(FileSystem, &Response);
}

static NTSTATUS FspFileSystemOpCreate_FileOverwrite(FSP_FILE_SYSTEM *FileSystem,
    FSP_FSCTL_TRANSACT_REQ *Request, BOOLEAN Supersede)
{
    return STATUS_NOT_IMPLEMENTED;
}

static NTSTATUS FspFileSystemOpCreate_FileOverwriteIf(FSP_FILE_SYSTEM *FileSystem,
    FSP_FSCTL_TRANSACT_REQ *Request)
{
    return STATUS_NOT_IMPLEMENTED;
}

FSP_API NTSTATUS FspFileSystemOpCreate(FSP_FILE_SYSTEM *FileSystem,
    FSP_FSCTL_TRANSACT_REQ *Request)
{
    if (0 == FileSystem->Interface->FileCreate || 0 == FileSystem->Interface->FileOpen)
        return FspFileSystemSendResponseWithStatus(FileSystem, Request, STATUS_INVALID_DEVICE_REQUEST);

    switch ((Request->Req.Create.CreateOptions >> 24) & 0xff)
    {
    case FILE_CREATE:
        return FspFileSystemOpCreate_FileCreate(FileSystem, Request);
    case FILE_OPEN:
        return FspFileSystemOpCreate_FileOpen(FileSystem, Request);
    case FILE_OPEN_IF:
        return FspFileSystemOpCreate_FileOpenIf(FileSystem, Request);
    case FILE_OVERWRITE:
        return FspFileSystemOpCreate_FileOverwrite(FileSystem, Request, FALSE);
    case FILE_SUPERSEDE:
        return FspFileSystemOpCreate_FileOverwrite(FileSystem, Request, TRUE);
    case FILE_OVERWRITE_IF:
        return FspFileSystemOpCreate_FileOverwriteIf(FileSystem, Request);
    default:
        return FspFileSystemSendResponseWithStatus(FileSystem, Request, STATUS_INVALID_PARAMETER);
    }
}