source: vbox/trunk/src/VBox/HostServices/SharedFolders/vbsf.cpp@ 65279

/* $Id: vbsf.cpp 65279 2017-01-13 11:45:20Z vboxsync $ */
/** @file
 * Shared Folders - VBox Shared Folders.
 */

/*
 * Copyright (C) 2006-2016 Oracle Corporation
 *
 * This file is part of VirtualBox Open Source Edition (OSE), as
 * available from http://www.alldomusa.eu.org. This file is free software;
 * you can redistribute it and/or modify it under the terms of the GNU
 * General Public License (GPL) as published by the Free Software
 * Foundation, in version 2 as it comes in the "COPYING" file of the
 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
 */

#ifdef UNITTEST
# include "testcase/tstSharedFolderService.h"
#endif

#include "vbsfpath.h"
#include "mappings.h"
#include "vbsf.h"
#include "shflhandle.h"

#include <iprt/alloc.h>
#include <iprt/assert.h>
#include <iprt/asm.h>
#include <iprt/fs.h>
#include <iprt/dir.h>
#include <iprt/file.h>
#include <iprt/path.h>
#include <iprt/string.h>
#include <iprt/symlink.h>
#include <iprt/uni.h>
#include <iprt/stream.h>
#ifdef RT_OS_DARWIN
# include <Carbon/Carbon.h>
#endif

#ifdef UNITTEST
# include "teststubs.h"
#endif

#define SHFL_RT_LINK(pClient) ((pClient)->fu32Flags & SHFL_CF_SYMLINKS ? RTPATH_F_ON_LINK : RTPATH_F_FOLLOW_LINK)

/**
 * @todo find a better solution for supporting the execute bit for non-windows
 * guests on windows host. Search for "0111" to find all the relevant places.
 */

void vbsfStripLastComponent(char *pszFullPath, uint32_t cbFullPathRoot)
{
    RTUNICP cp;

    /* Do not strip root. */
    char *s = pszFullPath + cbFullPathRoot;
    char *delimSecondLast = NULL;
    char *delimLast = NULL;

    LogFlowFunc(("%s -> %s\n", pszFullPath, s));

    for (;;)
    {
        cp = RTStrGetCp(s);

        if (cp == RTUNICP_INVALID || cp == 0)
        {
            break;
        }

        if (cp == RTPATH_DELIMITER)
        {
            if (delimLast != NULL)
            {
                delimSecondLast = delimLast;
            }

            delimLast = s;
        }

        s = RTStrNextCp(s);
    }

    if (cp == 0)
    {
        if (delimLast + 1 == s)
        {
            if (delimSecondLast)
            {
                *delimSecondLast = 0;
            }
            else if (delimLast)
            {
                *delimLast = 0;
            }
        }
        else
        {
            if (delimLast)
            {
                *delimLast = 0;
            }
        }
    }

    LogFlowFunc(("%s, %s, %s\n", pszFullPath, delimLast, delimSecondLast));
}

static int vbsfBuildFullPath(SHFLCLIENTDATA *pClient, SHFLROOT root, PSHFLSTRING pPath,
                             uint32_t cbPath, char **ppszFullPath, uint32_t *pcbFullPathRoot,
                             bool fWildCard = false, bool fPreserveLastComponent = false)
{
    char *pszHostPath = NULL;
    uint32_t fu32PathFlags = 0;
    uint32_t fu32Options =   VBSF_O_PATH_CHECK_ROOT_ESCAPE
                           | (fWildCard? VBSF_O_PATH_WILDCARD: 0)
                           | (fPreserveLastComponent? VBSF_O_PATH_PRESERVE_LAST_COMPONENT: 0);

    int rc = vbsfPathGuestToHost(pClient, root, pPath, cbPath,
                                 &pszHostPath, pcbFullPathRoot, fu32Options, &fu32PathFlags);
    if (BIT_FLAG(pClient->fu32Flags, SHFL_CF_UTF8))
    {
        LogRel2(("SharedFolders: GuestToHost 0x%RX32 [%.*s]->[%s] %Rrc\n", fu32PathFlags, pPath->u16Length, &pPath->String.utf8[0], pszHostPath, rc));
    }
    else
    {
        LogRel2(("SharedFolders: GuestToHost 0x%RX32 [%.*ls]->[%s] %Rrc\n", fu32PathFlags, pPath->u16Length / 2, &pPath->String.ucs2[0], pszHostPath, rc));
    }

    if (RT_SUCCESS(rc))
    {
        if (ppszFullPath)
            *ppszFullPath = pszHostPath;
    }
    return rc;
}

static void vbsfFreeFullPath(char *pszFullPath)
{
    vbsfFreeHostPath(pszFullPath);
}

/**
 * Convert shared folder create flags (see include/iprt/shflsvc.h) into iprt create flags.
 *
 * @returns iprt status code
 * @param  fWritable  whether the shared folder is writable
 * @param  fShflFlags shared folder create flags
 * @param  fMode      file attributes
 * @param  handleInitial initial handle
 * @retval pfOpen     iprt create flags
 */
static int vbsfConvertFileOpenFlags(bool fWritable, unsigned fShflFlags, RTFMODE fMode, SHFLHANDLE handleInitial, uint32_t *pfOpen)
{
    uint32_t fOpen = 0;
    int rc = VINF_SUCCESS;

    if (   (fMode & RTFS_DOS_MASK) != 0
        && (fMode & RTFS_UNIX_MASK) == 0)
    {
        /* A DOS/Windows guest, make RTFS_UNIX_* from RTFS_DOS_*.
         * @todo this is based on rtFsModeNormalize/rtFsModeFromDos.
         *       May be better to use RTFsModeNormalize here.
         */
        fMode |= RTFS_UNIX_IRUSR | RTFS_UNIX_IRGRP | RTFS_UNIX_IROTH;
        /* x for directories. */
        if (fMode & RTFS_DOS_DIRECTORY)
            fMode |= RTFS_TYPE_DIRECTORY | RTFS_UNIX_IXUSR | RTFS_UNIX_IXGRP | RTFS_UNIX_IXOTH;
        /* writable? */
        if (!(fMode & RTFS_DOS_READONLY))
            fMode |= RTFS_UNIX_IWUSR | RTFS_UNIX_IWGRP | RTFS_UNIX_IWOTH;

        /* Set the requested mode using only allowed bits. */
        fOpen |= ((fMode & RTFS_UNIX_MASK) << RTFILE_O_CREATE_MODE_SHIFT) & RTFILE_O_CREATE_MODE_MASK;
    }
    else
    {
        /* Old linux and solaris additions did not initialize the Info.Attr.fMode field
         * and it contained random bits from stack. Detect this using the handle field value
         * passed from the guest: old additions set it (incorrectly) to 0, new additions
         * set it to SHFL_HANDLE_NIL(~0).
         */
        if (handleInitial == 0)
        {
            /* Old additions. Do nothing, use default mode. */
        }
        else
        {
            /* New additions or Windows additions. Set the requested mode using only allowed bits.
             * Note: Windows guest set RTFS_UNIX_MASK bits to 0, which means a default mode
             *       will be set in fOpen.
             */
            fOpen |= ((fMode & RTFS_UNIX_MASK) << RTFILE_O_CREATE_MODE_SHIFT) & RTFILE_O_CREATE_MODE_MASK;
        }
    }

    switch (BIT_FLAG(fShflFlags, SHFL_CF_ACCESS_MASK_RW))
    {
        default:
        case SHFL_CF_ACCESS_NONE:
        {
#ifdef RT_OS_WINDOWS
            if (BIT_FLAG(fShflFlags, SHFL_CF_ACCESS_MASK_ATTR) != SHFL_CF_ACCESS_ATTR_NONE)
                fOpen |= RTFILE_O_ATTR_ONLY;
            else
#endif
                fOpen |= RTFILE_O_READ;
            Log(("FLAG: SHFL_CF_ACCESS_NONE\n"));
            break;
        }

        case SHFL_CF_ACCESS_READ:
        {
            fOpen |= RTFILE_O_READ;
            Log(("FLAG: SHFL_CF_ACCESS_READ\n"));
            break;
        }

        case SHFL_CF_ACCESS_WRITE:
        {
            fOpen |= RTFILE_O_WRITE;
            Log(("FLAG: SHFL_CF_ACCESS_WRITE\n"));
            break;
        }

        case SHFL_CF_ACCESS_READWRITE:
        {
            fOpen |= RTFILE_O_READWRITE;
            Log(("FLAG: SHFL_CF_ACCESS_READWRITE\n"));
            break;
        }
    }

    if (fShflFlags & SHFL_CF_ACCESS_APPEND)
    {
        fOpen |= RTFILE_O_APPEND;
    }

    switch (BIT_FLAG(fShflFlags, SHFL_CF_ACCESS_MASK_ATTR))
    {
        default:
        case SHFL_CF_ACCESS_ATTR_NONE:
        {
            fOpen |= RTFILE_O_ACCESS_ATTR_DEFAULT;
            Log(("FLAG: SHFL_CF_ACCESS_ATTR_NONE\n"));
            break;
        }

        case SHFL_CF_ACCESS_ATTR_READ:
        {
            fOpen |= RTFILE_O_ACCESS_ATTR_READ;
            Log(("FLAG: SHFL_CF_ACCESS_ATTR_READ\n"));
            break;
        }

        case SHFL_CF_ACCESS_ATTR_WRITE:
        {
            fOpen |= RTFILE_O_ACCESS_ATTR_WRITE;
            Log(("FLAG: SHFL_CF_ACCESS_ATTR_WRITE\n"));
            break;
        }

        case SHFL_CF_ACCESS_ATTR_READWRITE:
        {
            fOpen |= RTFILE_O_ACCESS_ATTR_READWRITE;
            Log(("FLAG: SHFL_CF_ACCESS_ATTR_READWRITE\n"));
            break;
        }
    }

    /* Sharing mask */
    switch (BIT_FLAG(fShflFlags, SHFL_CF_ACCESS_MASK_DENY))
    {
    default:
    case SHFL_CF_ACCESS_DENYNONE:
        fOpen |= RTFILE_O_DENY_NONE;
        Log(("FLAG: SHFL_CF_ACCESS_DENYNONE\n"));
        break;

    case SHFL_CF_ACCESS_DENYREAD:
        fOpen |= RTFILE_O_DENY_READ;
        Log(("FLAG: SHFL_CF_ACCESS_DENYREAD\n"));
        break;

    case SHFL_CF_ACCESS_DENYWRITE:
        fOpen |= RTFILE_O_DENY_WRITE;
        Log(("FLAG: SHFL_CF_ACCESS_DENYWRITE\n"));
        break;

    case SHFL_CF_ACCESS_DENYALL:
        fOpen |= RTFILE_O_DENY_ALL;
        Log(("FLAG: SHFL_CF_ACCESS_DENYALL\n"));
        break;
    }

    /* Open/Create action mask */
    switch (BIT_FLAG(fShflFlags, SHFL_CF_ACT_MASK_IF_EXISTS))
    {
    case SHFL_CF_ACT_OPEN_IF_EXISTS:
        if (SHFL_CF_ACT_CREATE_IF_NEW == BIT_FLAG(fShflFlags, SHFL_CF_ACT_MASK_IF_NEW))
        {
            fOpen |= RTFILE_O_OPEN_CREATE;
            Log(("FLAGS: SHFL_CF_ACT_OPEN_IF_EXISTS and SHFL_CF_ACT_CREATE_IF_NEW\n"));
        }
        else if (SHFL_CF_ACT_FAIL_IF_NEW == BIT_FLAG(fShflFlags, SHFL_CF_ACT_MASK_IF_NEW))
        {
            fOpen |= RTFILE_O_OPEN;
            Log(("FLAGS: SHFL_CF_ACT_OPEN_IF_EXISTS and SHFL_CF_ACT_FAIL_IF_NEW\n"));
        }
        else
        {
            Log(("FLAGS: invalid open/create action combination\n"));
            rc = VERR_INVALID_PARAMETER;
        }
        break;
    case SHFL_CF_ACT_FAIL_IF_EXISTS:
        if (SHFL_CF_ACT_CREATE_IF_NEW == BIT_FLAG(fShflFlags, SHFL_CF_ACT_MASK_IF_NEW))
        {
            fOpen |= RTFILE_O_CREATE;
            Log(("FLAGS: SHFL_CF_ACT_FAIL_IF_EXISTS and SHFL_CF_ACT_CREATE_IF_NEW\n"));
        }
        else
        {
            Log(("FLAGS: invalid open/create action combination\n"));
            rc = VERR_INVALID_PARAMETER;
        }
        break;
    case SHFL_CF_ACT_REPLACE_IF_EXISTS:
        if (SHFL_CF_ACT_CREATE_IF_NEW == BIT_FLAG(fShflFlags, SHFL_CF_ACT_MASK_IF_NEW))
        {
            fOpen |= RTFILE_O_CREATE_REPLACE;
            Log(("FLAGS: SHFL_CF_ACT_REPLACE_IF_EXISTS and SHFL_CF_ACT_CREATE_IF_NEW\n"));
        }
        else if (SHFL_CF_ACT_FAIL_IF_NEW == BIT_FLAG(fShflFlags, SHFL_CF_ACT_MASK_IF_NEW))
        {
            fOpen |= RTFILE_O_OPEN | RTFILE_O_TRUNCATE;
            Log(("FLAGS: SHFL_CF_ACT_REPLACE_IF_EXISTS and SHFL_CF_ACT_FAIL_IF_NEW\n"));
        }
        else
        {
            Log(("FLAGS: invalid open/create action combination\n"));
            rc = VERR_INVALID_PARAMETER;
        }
        break;
    case SHFL_CF_ACT_OVERWRITE_IF_EXISTS:
        if (SHFL_CF_ACT_CREATE_IF_NEW == BIT_FLAG(fShflFlags, SHFL_CF_ACT_MASK_IF_NEW))
        {
            fOpen |= RTFILE_O_CREATE_REPLACE;
            Log(("FLAGS: SHFL_CF_ACT_OVERWRITE_IF_EXISTS and SHFL_CF_ACT_CREATE_IF_NEW\n"));
        }
        else if (SHFL_CF_ACT_FAIL_IF_NEW == BIT_FLAG(fShflFlags, SHFL_CF_ACT_MASK_IF_NEW))
        {
            fOpen |= RTFILE_O_OPEN | RTFILE_O_TRUNCATE;
            Log(("FLAGS: SHFL_CF_ACT_OVERWRITE_IF_EXISTS and SHFL_CF_ACT_FAIL_IF_NEW\n"));
        }
        else
        {
            Log(("FLAGS: invalid open/create action combination\n"));
            rc = VERR_INVALID_PARAMETER;
        }
        break;
    default:
        rc = VERR_INVALID_PARAMETER;
        Log(("FLAG: SHFL_CF_ACT_MASK_IF_EXISTS - invalid parameter\n"));
    }

    if (RT_SUCCESS(rc))
    {
        if (!fWritable)
            fOpen &= ~RTFILE_O_WRITE;

        *pfOpen = fOpen;
    }
    return rc;
}

/**
 * Open a file or create and open a new one.
 *
 * @returns IPRT status code
 * @param  pClient               Data structure describing the client accessing the shared folder
 * @param  root                  The index of the shared folder in the table of mappings.
 * @param  pszPath               Path to the file or folder on the host.
 * @param  pParms @a CreateFlags Creation or open parameters, see include/VBox/shflsvc.h
 * @param  pParms @a Info        When a new file is created this specifies the initial parameters.
 *                               When a file is created or overwritten, it also specifies the
 *                               initial size.
 * @retval pParms @a Resulte     Shared folder status code, see include/VBox/shflsvc.h
 * @retval pParms @a Handle      On success the (shared folder) handle of the file opened or
 *                               created
 * @retval pParms @a Info        On success the parameters of the file opened or created
 */
static int vbsfOpenFile(SHFLCLIENTDATA *pClient, SHFLROOT root, const char *pszPath, SHFLCREATEPARMS *pParms)
{
    LogFlow(("vbsfOpenFile: pszPath = %s, pParms = %p\n", pszPath, pParms));
    Log(("SHFL create flags %08x\n", pParms->CreateFlags));

    SHFLHANDLE      handle = SHFL_HANDLE_NIL;
    SHFLFILEHANDLE *pHandle = 0;
    /* Open or create a file. */
    uint32_t fOpen = 0;
    bool fNoError = false;
    static int cErrors;

    /* is the guest allowed to write to this share? */
    bool fWritable;
    int rc = vbsfMappingsQueryWritable(pClient, root, &fWritable);
    if (RT_FAILURE(rc))
        fWritable = false;

    rc = vbsfConvertFileOpenFlags(fWritable, pParms->CreateFlags, pParms->Info.Attr.fMode, pParms->Handle, &fOpen);
    if (RT_SUCCESS(rc))
    {
        rc = VERR_NO_MEMORY;  /* Default error. */
        handle  = vbsfAllocFileHandle(pClient);
        if (handle != SHFL_HANDLE_NIL)
        {
            pHandle = vbsfQueryFileHandle(pClient, handle);
            if (pHandle)
            {
                rc = RTFileOpen(&pHandle->file.Handle, pszPath, fOpen);
            }
        }
    }
    if (RT_FAILURE(rc))
    {
        switch (rc)
        {
        case VERR_FILE_NOT_FOUND:
            pParms->Result = SHFL_FILE_NOT_FOUND;

            /* This actually isn't an error, so correct the rc before return later,
               because the driver (VBoxSF.sys) expects rc = VINF_SUCCESS and checks the result code. */
            fNoError = true;
            break;
        case VERR_PATH_NOT_FOUND:
            pParms->Result = SHFL_PATH_NOT_FOUND;

            /* This actually isn't an error, so correct the rc before return later,
               because the driver (VBoxSF.sys) expects rc = VINF_SUCCESS and checks the result code. */
            fNoError = true;
            break;
        case VERR_ALREADY_EXISTS:
            RTFSOBJINFO info;

            /** @todo Possible race left here. */
            if (RT_SUCCESS(RTPathQueryInfoEx(pszPath, &info, RTFSOBJATTRADD_NOTHING, SHFL_RT_LINK(pClient))))
            {
#ifdef RT_OS_WINDOWS
                info.Attr.fMode |= 0111;
#endif
                vbfsCopyFsObjInfoFromIprt(&pParms->Info, &info);
            }
            pParms->Result = SHFL_FILE_EXISTS;

            /* This actually isn't an error, so correct the rc before return later,
               because the driver (VBoxSF.sys) expects rc = VINF_SUCCESS and checks the result code. */
            fNoError = true;
            break;
        case VERR_TOO_MANY_OPEN_FILES:
            if (cErrors < 32)
            {
                LogRel(("SharedFolders host service: Cannot open '%s' -- too many open files.\n", pszPath));
#if defined RT_OS_LINUX || defined(RT_OS_SOLARIS)
                if (cErrors < 1)
                    LogRel(("SharedFolders host service: Try to increase the limit for open files (ulimit -n)\n"));
#endif
                cErrors++;
            }
            pParms->Result = SHFL_NO_RESULT;
            break;
        default:
            pParms->Result = SHFL_NO_RESULT;
        }
    }
    else
    {
        /** @note The shared folder status code is very approximate, as the runtime
          *       does not really provide this information. */
        pParms->Result = SHFL_FILE_EXISTS;  /* We lost the information as to whether it was
                                               created when we eliminated the race. */
        if (   (   SHFL_CF_ACT_REPLACE_IF_EXISTS
                == BIT_FLAG(pParms->CreateFlags, SHFL_CF_ACT_MASK_IF_EXISTS))
            || (   SHFL_CF_ACT_OVERWRITE_IF_EXISTS
                == BIT_FLAG(pParms->CreateFlags, SHFL_CF_ACT_MASK_IF_EXISTS)))
        {
            /* For now, we do not treat a failure here as fatal. */
            /** @todo Also set the size for SHFL_CF_ACT_CREATE_IF_NEW if
                     SHFL_CF_ACT_FAIL_IF_EXISTS is set. */
            RTFileSetSize(pHandle->file.Handle, pParms->Info.cbObject);
            pParms->Result = SHFL_FILE_REPLACED;
        }
        if (   (   SHFL_CF_ACT_FAIL_IF_EXISTS
                == BIT_FLAG(pParms->CreateFlags, SHFL_CF_ACT_MASK_IF_EXISTS))
            || (   SHFL_CF_ACT_CREATE_IF_NEW
                == BIT_FLAG(pParms->CreateFlags, SHFL_CF_ACT_MASK_IF_NEW)))
        {
            pParms->Result = SHFL_FILE_CREATED;
        }
#if 0
        /** @todo */
        /* Set new attributes. */
        if (   (   SHFL_CF_ACT_REPLACE_IF_EXISTS
                == BIT_FLAG(pParms->CreateFlags, SHFL_CF_ACT_MASK_IF_EXISTS))
            || (   SHFL_CF_ACT_CREATE_IF_NEW
                == BIT_FLAG(pParms->CreateFlags, SHFL_CF_ACT_MASK_IF_NEW)))
        {
            RTFileSetTimes(pHandle->file.Handle,
                          &pParms->Info.AccessTime,
                          &pParms->Info.ModificationTime,
                          &pParms->Info.ChangeTime,
                          &pParms->Info.BirthTime
                          );

            RTFileSetMode (pHandle->file.Handle, pParms->Info.Attr.fMode);
        }
#endif
        RTFSOBJINFO info;

        /* Get file information */
        rc = RTFileQueryInfo(pHandle->file.Handle, &info, RTFSOBJATTRADD_NOTHING);
        if (RT_SUCCESS(rc))
        {
#ifdef RT_OS_WINDOWS
            info.Attr.fMode |= 0111;
#endif
            vbfsCopyFsObjInfoFromIprt(&pParms->Info, &info);
        }
    }
    /* Free resources if any part of the function has failed. */
    if (RT_FAILURE(rc))
    {
        if (   (0 != pHandle)
            && (NIL_RTFILE != pHandle->file.Handle)
            && (0 != pHandle->file.Handle))
        {
            RTFileClose(pHandle->file.Handle);
            pHandle->file.Handle = NIL_RTFILE;
        }
        if (SHFL_HANDLE_NIL != handle)
        {
            vbsfFreeFileHandle(pClient, handle);
        }
        pParms->Handle = SHFL_HANDLE_NIL;
    }
    else
    {
        pParms->Handle = handle;
    }

    /* Report the driver that all is okay, we're done here */
    if (fNoError)
        rc = VINF_SUCCESS;

    LogFlow(("vbsfOpenFile: rc = %Rrc\n", rc));
    return rc;
}

/**
 * Open a folder or create and open a new one.
 *
 * @returns IPRT status code
 * @param  pClient               Data structure describing the client accessing the shared folder
 * @param  pszPath               Path to the file or folder on the host.
 * @param  pParms @a CreateFlags Creation or open parameters, see include/VBox/shflsvc.h
 * @retval pParms @a Result      Shared folder status code, see include/VBox/shflsvc.h
 * @retval pParms @a Handle      On success the (shared folder) handle of the folder opened or
 *                               created
 * @retval pParms @a Info        On success the parameters of the folder opened or created
 *
 * @note folders are created with fMode = 0777
 */
static int vbsfOpenDir(SHFLCLIENTDATA *pClient, const char *pszPath,
                       SHFLCREATEPARMS *pParms)
{
    LogFlow(("vbsfOpenDir: pszPath = %s, pParms = %p\n", pszPath, pParms));
    Log(("SHFL create flags %08x\n", pParms->CreateFlags));

    int rc = VERR_NO_MEMORY;
    SHFLHANDLE      handle = vbsfAllocDirHandle(pClient);
    SHFLFILEHANDLE *pHandle = vbsfQueryDirHandle(pClient, handle);
    if (0 != pHandle)
    {
        rc = VINF_SUCCESS;
        pParms->Result = SHFL_FILE_EXISTS;  /* May be overwritten with SHFL_FILE_CREATED. */
        /** @todo Can anyone think of a sensible, race-less way to do this?  Although
                  I suspect that the race is inherent, due to the API available... */
        /* Try to create the folder first if "create if new" is specified.  If this
           fails, and "open if exists" is specified, then we ignore the failure and try
           to open the folder anyway. */
        if (   SHFL_CF_ACT_CREATE_IF_NEW
            == BIT_FLAG(pParms->CreateFlags, SHFL_CF_ACT_MASK_IF_NEW))
        {
            /** @todo render supplied attributes.
            * bird: The guest should specify this. For windows guests RTFS_DOS_DIRECTORY should suffice. */
            RTFMODE fMode = 0777;

            pParms->Result = SHFL_FILE_CREATED;
            rc = RTDirCreate(pszPath, fMode, 0);
            if (RT_FAILURE(rc))
            {
                switch (rc)
                {
                case VERR_ALREADY_EXISTS:
                    pParms->Result = SHFL_FILE_EXISTS;
                    break;
                case VERR_PATH_NOT_FOUND:
                    pParms->Result = SHFL_PATH_NOT_FOUND;
                    break;
                default:
                    pParms->Result = SHFL_NO_RESULT;
                }
            }
        }
        if (   RT_SUCCESS(rc)
            || (SHFL_CF_ACT_OPEN_IF_EXISTS == BIT_FLAG(pParms->CreateFlags, SHFL_CF_ACT_MASK_IF_EXISTS)))
        {
            /* Open the directory now */
            rc = RTDirOpenFiltered(&pHandle->dir.Handle, pszPath, RTDIRFILTER_NONE, 0);
            if (RT_SUCCESS(rc))
            {
                RTFSOBJINFO info;

                rc = RTDirQueryInfo(pHandle->dir.Handle, &info, RTFSOBJATTRADD_NOTHING);
                if (RT_SUCCESS(rc))
                {
                    vbfsCopyFsObjInfoFromIprt(&pParms->Info, &info);
                }
            }
            else
            {
                switch (rc)
                {
                case VERR_FILE_NOT_FOUND:  /* Does this make sense? */
                    pParms->Result = SHFL_FILE_NOT_FOUND;
                    break;
                case VERR_PATH_NOT_FOUND:
                    pParms->Result = SHFL_PATH_NOT_FOUND;
                    break;
                case VERR_ACCESS_DENIED:
                    pParms->Result = SHFL_FILE_EXISTS;
                    break;
                default:
                    pParms->Result = SHFL_NO_RESULT;
                }
            }
        }
    }
    if (RT_FAILURE(rc))
    {
        if (   (0 != pHandle)
            && (0 != pHandle->dir.Handle))
        {
            RTDirClose(pHandle->dir.Handle);
            pHandle->dir.Handle = 0;
        }
        if (SHFL_HANDLE_NIL != handle)
        {
            vbsfFreeFileHandle(pClient, handle);
        }
        pParms->Handle = SHFL_HANDLE_NIL;
    }
    else
    {
        pParms->Handle = handle;
    }
    LogFlow(("vbsfOpenDir: rc = %Rrc\n", rc));
    return rc;
}

static int vbsfCloseDir(SHFLFILEHANDLE *pHandle)
{
    int rc = VINF_SUCCESS;

    LogFlow(("vbsfCloseDir: Handle = %08X Search Handle = %08X\n",
             pHandle->dir.Handle, pHandle->dir.SearchHandle));

    RTDirClose(pHandle->dir.Handle);

    if (pHandle->dir.SearchHandle)
        RTDirClose(pHandle->dir.SearchHandle);

    if (pHandle->dir.pLastValidEntry)
    {
        RTMemFree(pHandle->dir.pLastValidEntry);
        pHandle->dir.pLastValidEntry = NULL;
    }

    LogFlow(("vbsfCloseDir: rc = %d\n", rc));

    return rc;
}


static int vbsfCloseFile(SHFLFILEHANDLE *pHandle)
{
    int rc = VINF_SUCCESS;

    LogFlow(("vbsfCloseFile: Handle = %08X\n",
             pHandle->file.Handle));

    rc = RTFileClose(pHandle->file.Handle);

    LogFlow(("vbsfCloseFile: rc = %d\n", rc));

    return rc;
}

/**
 * Look up file or folder information by host path.
 *
 * @returns iprt status code (currently VINF_SUCCESS)
 * @param   pClient    client data
 * @param   pszPath    The path of the file to be looked up
 * @retval  pParms->Result Status of the operation (success or error)
 * @retval  pParms->Info   On success, information returned about the file
 */
static int vbsfLookupFile(SHFLCLIENTDATA *pClient, char *pszPath, SHFLCREATEPARMS *pParms)
{
    RTFSOBJINFO info;
    int rc;

    rc = RTPathQueryInfoEx(pszPath, &info, RTFSOBJATTRADD_NOTHING, SHFL_RT_LINK(pClient));
    LogFlow(("SHFL_CF_LOOKUP\n"));
    /* Client just wants to know if the object exists. */
    switch (rc)
    {
        case VINF_SUCCESS:
        {
#ifdef RT_OS_WINDOWS
            info.Attr.fMode |= 0111;
#endif
            vbfsCopyFsObjInfoFromIprt(&pParms->Info, &info);
            pParms->Result = SHFL_FILE_EXISTS;
            break;
        }

        case VERR_FILE_NOT_FOUND:
        {
            pParms->Result = SHFL_FILE_NOT_FOUND;
            rc = VINF_SUCCESS;
            break;
        }

        case VERR_PATH_NOT_FOUND:
        {
            pParms->Result = SHFL_PATH_NOT_FOUND;
            rc = VINF_SUCCESS;
            break;
        }
    }
    pParms->Handle = SHFL_HANDLE_NIL;
    return rc;
}

#ifdef UNITTEST
/** Unit test the SHFL_FN_CREATE API.  Located here as a form of API
 * documentation. */
void testCreate(RTTEST hTest)
{
    /* Simple opening of an existing file. */
    testCreateFileSimple(hTest);
    /* Simple opening of an existing directory. */
    /** @todo How do wildcards in the path name work? */
    testCreateDirSimple(hTest);
    /* If the number or types of parameters are wrong the API should fail. */
    testCreateBadParameters(hTest);
    /* Add tests as required... */
}
#endif

/**
 * Create or open a file or folder.  Perform character set and case
 * conversion on the file name if necessary.
 *
 * @returns IPRT status code, but see note below
 * @param   pClient        Data structure describing the client accessing the shared
 *                         folder
 * @param   root           The index of the shared folder in the table of mappings.
 *                         The host path of the shared folder is found using this.
 * @param   pPath          The path of the file or folder relative to the host path
 *                         indexed by root.
 * @param   cbPath         Presumably the length of the path in pPath.  Actually
 *                         ignored, as pPath contains a length parameter.
 * @param   pParms @a Info If a new file is created or an old one overwritten, set
 *                         these attributes
 * @retval  pParms @a Result Shared folder result code, see include/VBox/shflsvc.h
 * @retval  pParms @a Handle Shared folder handle to the newly opened file
 * @retval  pParms @a Info Attributes of the file or folder opened
 *
 * @note This function returns success if a "non-exceptional" error occurred,
 *       such as "no such file".  In this case, the caller should check the
 *       pParms->Result return value and whether pParms->Handle is valid.
 */
int vbsfCreate(SHFLCLIENTDATA *pClient, SHFLROOT root, SHFLSTRING *pPath, uint32_t cbPath, SHFLCREATEPARMS *pParms)
{
    int rc = VINF_SUCCESS;

    LogFlow(("vbsfCreate: pClient = %p, pPath = %p, cbPath = %d, pParms = %p CreateFlags=%x\n",
             pClient, pPath, cbPath, pParms, pParms->CreateFlags));

    /* Check the client access rights to the root. */
    /** @todo */

    /* Build a host full path for the given path, handle file name case issues (if the guest
     * expects case-insensitive paths but the host is case-sensitive) and convert ucs2 to utf8 if
     * necessary.
     */
    char *pszFullPath = NULL;
    uint32_t cbFullPathRoot = 0;

    rc = vbsfBuildFullPath(pClient, root, pPath, cbPath, &pszFullPath, &cbFullPathRoot);
    if (RT_SUCCESS(rc))
    {
        /* Reset return value in case client forgot to do so.
         * pParms->Handle must not be reset here, as it is used
         * in vbsfOpenFile to detect old additions.
         */
        pParms->Result = SHFL_NO_RESULT;

        if (BIT_FLAG(pParms->CreateFlags, SHFL_CF_LOOKUP))
        {
            rc = vbsfLookupFile(pClient, pszFullPath, pParms);
        }
        else
        {
            /* Query path information. */
            RTFSOBJINFO info;

            rc = RTPathQueryInfoEx(pszFullPath, &info, RTFSOBJATTRADD_NOTHING, SHFL_RT_LINK(pClient));
            LogFlow(("RTPathQueryInfoEx returned %Rrc\n", rc));

            if (RT_SUCCESS(rc))
            {
                /* Mark it as a directory in case the caller didn't. */
                /**
                  * @todo I left this in in order not to change the behaviour of the
                  *       function too much.  Is it really needed, and should it really be
                  *       here?
                  */
                if (BIT_FLAG(info.Attr.fMode, RTFS_DOS_DIRECTORY))
                {
                    pParms->CreateFlags |= SHFL_CF_DIRECTORY;
                }

                /**
                  * @todo This should be in the Windows Guest Additions, as no-one else
                  *       needs it.
                  */
                if (BIT_FLAG(pParms->CreateFlags, SHFL_CF_OPEN_TARGET_DIRECTORY))
                {
                    vbsfStripLastComponent(pszFullPath, cbFullPathRoot);
                    pParms->CreateFlags &= ~SHFL_CF_ACT_MASK_IF_EXISTS;
                    pParms->CreateFlags &= ~SHFL_CF_ACT_MASK_IF_NEW;
                    pParms->CreateFlags |= SHFL_CF_DIRECTORY;
                    pParms->CreateFlags |= SHFL_CF_ACT_OPEN_IF_EXISTS;
                    pParms->CreateFlags |= SHFL_CF_ACT_FAIL_IF_NEW;
                }
            }

            rc = VINF_SUCCESS;

            /* Note: do not check the SHFL_CF_ACCESS_WRITE here, only check if the open operation
             * will cause changes.
             *
             * Actual operations (write, set attr, etc), which can write to a shared folder, have
             * the check and will return VERR_WRITE_PROTECT if the folder is not writable.
             */
            if (   (pParms->CreateFlags & SHFL_CF_ACT_MASK_IF_EXISTS) == SHFL_CF_ACT_REPLACE_IF_EXISTS
                || (pParms->CreateFlags & SHFL_CF_ACT_MASK_IF_EXISTS) == SHFL_CF_ACT_OVERWRITE_IF_EXISTS
                || (pParms->CreateFlags & SHFL_CF_ACT_MASK_IF_NEW) == SHFL_CF_ACT_CREATE_IF_NEW
               )
            {
                /* is the guest allowed to write to this share? */
                bool fWritable;
                rc = vbsfMappingsQueryWritable(pClient, root, &fWritable);
                if (RT_FAILURE(rc) || !fWritable)
                    rc = VERR_WRITE_PROTECT;
            }

            if (RT_SUCCESS(rc))
            {
                if (BIT_FLAG(pParms->CreateFlags, SHFL_CF_DIRECTORY))
                {
                    rc = vbsfOpenDir(pClient, pszFullPath, pParms);
                }
                else
                {
                    rc = vbsfOpenFile(pClient, root, pszFullPath, pParms);
                }
            }
            else
            {
                pParms->Handle = SHFL_HANDLE_NIL;
            }
        }

        /* free the path string */
        vbsfFreeFullPath(pszFullPath);
    }

    Log(("vbsfCreate: handle = %RX64 rc = %Rrc result=%x\n", (uint64_t)pParms->Handle, rc, pParms->Result));

    return rc;
}

#ifdef UNITTEST
/** Unit test the SHFL_FN_CLOSE API.  Located here as a form of API
 * documentation. */
void testClose(RTTEST hTest)
{
    /* If the API parameters are invalid the API should fail. */
    testCloseBadParameters(hTest);
    /* Add tests as required... */
}
#endif

int vbsfClose(SHFLCLIENTDATA *pClient, SHFLROOT root, SHFLHANDLE Handle)
{
    RT_NOREF1(root);
    int rc = VINF_SUCCESS;

    LogFlow(("vbsfClose: pClient = %p, Handle = %RX64\n",
             pClient, Handle));

    uint32_t type = vbsfQueryHandleType(pClient, Handle);
    Assert((type & ~(SHFL_HF_TYPE_DIR | SHFL_HF_TYPE_FILE)) == 0);

    switch (type & (SHFL_HF_TYPE_DIR | SHFL_HF_TYPE_FILE))
    {
        case SHFL_HF_TYPE_DIR:
        {
            rc = vbsfCloseDir(vbsfQueryDirHandle(pClient, Handle));
            break;
        }
        case SHFL_HF_TYPE_FILE:
        {
            rc = vbsfCloseFile(vbsfQueryFileHandle(pClient, Handle));
            break;
        }
        default:
            return VERR_INVALID_HANDLE;
    }
    vbsfFreeFileHandle(pClient, Handle);

    Log(("vbsfClose: rc = %Rrc\n", rc));

    return rc;
}

#ifdef UNITTEST
/** Unit test the SHFL_FN_READ API.  Located here as a form of API
 * documentation. */
void testRead(RTTEST hTest)
{
    /* If the number or types of parameters are wrong the API should fail. */
    testReadBadParameters(hTest);
    /* Basic reading from a file. */
    testReadFileSimple(hTest);
    /* Add tests as required... */
}
#endif
int vbsfRead  (SHFLCLIENTDATA *pClient, SHFLROOT root, SHFLHANDLE Handle, uint64_t offset, uint32_t *pcbBuffer, uint8_t *pBuffer)
{
    SHFLFILEHANDLE *pHandle = vbsfQueryFileHandle(pClient, Handle);
    size_t count = 0;
    int rc;

    if (pHandle == 0 || pcbBuffer == 0 || pBuffer == 0)
    {
        AssertFailed();
        return VERR_INVALID_PARAMETER;
    }

    Log(("vbsfRead %RX64 offset %RX64 bytes %x\n", Handle, offset, *pcbBuffer));

    /* Is the guest allowed to access this share?
     * Checked here because the shared folder can be removed from the VM settings. */
    bool fWritable;
    rc = vbsfMappingsQueryWritable(pClient, root, &fWritable);
    if (RT_FAILURE(rc))
        return VERR_ACCESS_DENIED;

    if (*pcbBuffer == 0)
        return VINF_SUCCESS; /** @todo correct? */


    rc = RTFileSeek(pHandle->file.Handle, offset, RTFILE_SEEK_BEGIN, NULL);
    if (rc != VINF_SUCCESS)
    {
        AssertRC(rc);
        return rc;
    }

    rc = RTFileRead(pHandle->file.Handle, pBuffer, *pcbBuffer, &count);
    *pcbBuffer = (uint32_t)count;
    Log(("RTFileRead returned %Rrc bytes read %x\n", rc, count));
    return rc;
}

#ifdef UNITTEST
/** Unit test the SHFL_FN_WRITE API.  Located here as a form of API
 * documentation. */
void testWrite(RTTEST hTest)
{
    /* If the number or types of parameters are wrong the API should fail. */
    testWriteBadParameters(hTest);
    /* Simple test of writing to a file. */
    testWriteFileSimple(hTest);
    /* Add tests as required... */
}
#endif
int vbsfWrite(SHFLCLIENTDATA *pClient, SHFLROOT root, SHFLHANDLE Handle, uint64_t offset, uint32_t *pcbBuffer, uint8_t *pBuffer)
{
    SHFLFILEHANDLE *pHandle = vbsfQueryFileHandle(pClient, Handle);
    size_t count = 0;
    int rc;

    if (pHandle == 0 || pcbBuffer == 0 || pBuffer == 0)
    {
        AssertFailed();
        return VERR_INVALID_PARAMETER;
    }

    Log(("vbsfWrite %RX64 offset %RX64 bytes %x\n", Handle, offset, *pcbBuffer));

    /* Is the guest allowed to write to this share?
     * Checked here because the shared folder can be removed from the VM settings. */
    bool fWritable;
    rc = vbsfMappingsQueryWritable(pClient, root, &fWritable);
    if (RT_FAILURE(rc) || !fWritable)
        return VERR_WRITE_PROTECT;

    if (*pcbBuffer == 0)
        return VINF_SUCCESS; /** @todo correct? */

    rc = RTFileSeek(pHandle->file.Handle, offset, RTFILE_SEEK_BEGIN, NULL);
    if (rc != VINF_SUCCESS)
    {
        AssertRC(rc);
        return rc;
    }

    rc = RTFileWrite(pHandle->file.Handle, pBuffer, *pcbBuffer, &count);
    *pcbBuffer = (uint32_t)count;
    Log(("RTFileWrite returned %Rrc bytes written %x\n", rc, count));
    return rc;
}


#ifdef UNITTEST
/** Unit test the SHFL_FN_FLUSH API.  Located here as a form of API
 * documentation. */
void testFlush(RTTEST hTest)
{
    /* If the number or types of parameters are wrong the API should fail. */
    testFlushBadParameters(hTest);
    /* Simple opening and flushing of a file. */
    testFlushFileSimple(hTest);
    /* Add tests as required... */
}
#endif

int vbsfFlush(SHFLCLIENTDATA *pClient, SHFLROOT root, SHFLHANDLE Handle)
{
    RT_NOREF1(root);
    SHFLFILEHANDLE *pHandle = vbsfQueryFileHandle(pClient, Handle);
    int rc = VINF_SUCCESS;

    if (pHandle == 0)
    {
        AssertFailed();
        return VERR_INVALID_HANDLE;
    }

    Log(("vbsfFlush %RX64\n", Handle));
    rc = RTFileFlush(pHandle->file.Handle);
    AssertRC(rc);
    return rc;
}

#ifdef UNITTEST
/** Unit test the SHFL_FN_LIST API.  Located here as a form of API
 * documentation. */
void testDirList(RTTEST hTest)
{
    /* If the number or types of parameters are wrong the API should fail. */
    testDirListBadParameters(hTest);
    /* Test listing an empty directory (simple edge case). */
    testDirListEmpty(hTest);
    /* Add tests as required... */
}
#endif
int vbsfDirList(SHFLCLIENTDATA *pClient, SHFLROOT root, SHFLHANDLE Handle, SHFLSTRING *pPath, uint32_t flags,
                uint32_t *pcbBuffer, uint8_t *pBuffer, uint32_t *pIndex, uint32_t *pcFiles)
{
    SHFLFILEHANDLE *pHandle = vbsfQueryDirHandle(pClient, Handle);
    PRTDIRENTRYEX  pDirEntry = 0, pDirEntryOrg;
    uint32_t       cbDirEntry, cbBufferOrg;
    int            rc = VINF_SUCCESS;
    PSHFLDIRINFO   pSFDEntry;
    PRTUTF16       pwszString;
    PRTDIR         DirHandle;
    bool           fUtf8;

    fUtf8 = BIT_FLAG(pClient->fu32Flags, SHFL_CF_UTF8) != 0;

    if (pHandle == 0 || pcbBuffer == 0 || pBuffer == 0)
    {
        AssertFailed();
        return VERR_INVALID_PARAMETER;
    }

    /* Is the guest allowed to access this share?
     * Checked here because the shared folder can be removed from the VM settings. */
    bool fWritable;
    rc = vbsfMappingsQueryWritable(pClient, root, &fWritable);
    if (RT_FAILURE(rc))
        return VERR_ACCESS_DENIED;

    Assert(pIndex && *pIndex == 0);
    DirHandle = pHandle->dir.Handle;

    cbDirEntry = 4096;
    pDirEntryOrg = pDirEntry  = (PRTDIRENTRYEX)RTMemAlloc(cbDirEntry);
    if (pDirEntry == 0)
    {
        AssertFailed();
        return VERR_NO_MEMORY;
    }

    cbBufferOrg = *pcbBuffer;
    *pcbBuffer  = 0;
    pSFDEntry   = (PSHFLDIRINFO)pBuffer;

    *pIndex = 1; /* not yet complete */
    *pcFiles = 0;

    if (pPath)
    {
        if (pHandle->dir.SearchHandle == 0)
        {
            /* Build a host full path for the given path
             * and convert ucs2 to utf8 if necessary.
             */
            char *pszFullPath = NULL;

            Assert(pHandle->dir.pLastValidEntry == 0);

            rc = vbsfBuildFullPath(pClient, root, pPath, pPath->u16Size + SHFLSTRING_HEADER_SIZE, &pszFullPath, NULL, true);

            if (RT_SUCCESS(rc))
            {
                rc = RTDirOpenFiltered(&pHandle->dir.SearchHandle, pszFullPath, RTDIRFILTER_WINNT, 0);

                /* free the path string */
                vbsfFreeFullPath(pszFullPath);

                if (RT_FAILURE(rc))
                    goto end;
            }
            else
                goto end;
        }
        Assert(pHandle->dir.SearchHandle);
        DirHandle = pHandle->dir.SearchHandle;
    }

    while (cbBufferOrg)
    {
        size_t cbDirEntrySize = cbDirEntry;
        uint32_t cbNeeded;

        /* Do we still have a valid last entry for the active search? If so, then return it here */
        if (pHandle->dir.pLastValidEntry)
        {
            pDirEntry = pHandle->dir.pLastValidEntry;
        }
        else
        {
            pDirEntry = pDirEntryOrg;

            rc = RTDirReadEx(DirHandle, pDirEntry, &cbDirEntrySize, RTFSOBJATTRADD_NOTHING, SHFL_RT_LINK(pClient));
            if (rc == VERR_NO_MORE_FILES)
            {
                *pIndex = 0; /* listing completed */
                break;
            }

            if (   rc != VINF_SUCCESS
                && rc != VWRN_NO_DIRENT_INFO)
            {
                //AssertFailed();
                if (   rc == VERR_NO_TRANSLATION
                    || rc == VERR_INVALID_UTF8_ENCODING)
                    continue;
                break;
            }
        }

        cbNeeded = RT_OFFSETOF(SHFLDIRINFO, name.String);
        if (fUtf8)
            cbNeeded += pDirEntry->cbName + 1;
        else
            /* Overestimating, but that's ok */
            cbNeeded += (pDirEntry->cbName + 1) * 2;

        if (cbBufferOrg < cbNeeded)
        {
            /* No room, so save this directory entry, or else it's lost forever */
            pHandle->dir.pLastValidEntry = pDirEntry;

            if (*pcFiles == 0)
            {
                AssertFailed();
                return VINF_BUFFER_OVERFLOW;    /* Return directly and don't free pDirEntry */
            }
            return VINF_SUCCESS;    /* Return directly and don't free pDirEntry */
        }

#ifdef RT_OS_WINDOWS
        pDirEntry->Info.Attr.fMode |= 0111;
#endif
        vbfsCopyFsObjInfoFromIprt(&pSFDEntry->Info, &pDirEntry->Info);
        pSFDEntry->cucShortName = 0;

        if (fUtf8)
        {
            void *src, *dst;

            src = &pDirEntry->szName[0];
            dst = &pSFDEntry->name.String.utf8[0];

            memcpy(dst, src, pDirEntry->cbName + 1);

            pSFDEntry->name.u16Size = pDirEntry->cbName + 1;
            pSFDEntry->name.u16Length = pDirEntry->cbName;
        }
        else
        {
            pSFDEntry->name.String.ucs2[0] = 0;
            pwszString = pSFDEntry->name.String.ucs2;
            int rc2 = RTStrToUtf16Ex(pDirEntry->szName, RTSTR_MAX, &pwszString, pDirEntry->cbName+1, NULL);
            AssertRC(rc2);

#ifdef RT_OS_DARWIN
/** @todo This belongs in rtPathToNative or in the windows shared folder file system driver...
 * The question is simply whether the NFD normalization is actually applied on a (virtual) file
 * system level in darwin, or just by the user mode application libs. */
            {
                // Convert to
                // Normalization Form C (composed Unicode). We need this because
                // Mac OS X file system uses NFD (Normalization Form D :decomposed Unicode)
                // while most other OS', server-side programs usually expect NFC.
                uint16_t ucs2Length;
                CFRange rangeCharacters;
                CFMutableStringRef inStr = ::CFStringCreateMutable(NULL, 0);

                ::CFStringAppendCharacters(inStr, (UniChar *)pwszString, RTUtf16Len(pwszString));
                ::CFStringNormalize(inStr, kCFStringNormalizationFormC);
                ucs2Length = ::CFStringGetLength(inStr);

                rangeCharacters.location = 0;
                rangeCharacters.length = ucs2Length;
                ::CFStringGetCharacters(inStr, rangeCharacters, pwszString);
                pwszString[ucs2Length] = 0x0000; // NULL terminated

                CFRelease(inStr);
            }
#endif
            pSFDEntry->name.u16Length = (uint32_t)RTUtf16Len(pSFDEntry->name.String.ucs2) * 2;
            pSFDEntry->name.u16Size = pSFDEntry->name.u16Length + 2;

            Log(("SHFL: File name size %d\n", pSFDEntry->name.u16Size));
            Log(("SHFL: File name %ls\n", &pSFDEntry->name.String.ucs2));

            // adjust cbNeeded (it was overestimated before)
            cbNeeded = RT_OFFSETOF(SHFLDIRINFO, name.String) + pSFDEntry->name.u16Size;
        }

        pSFDEntry   = (PSHFLDIRINFO)((uintptr_t)pSFDEntry + cbNeeded);
        *pcbBuffer += cbNeeded;
        cbBufferOrg-= cbNeeded;

        *pcFiles   += 1;

        /* Free the saved last entry, that we've just returned */
        if (pHandle->dir.pLastValidEntry)
        {
            RTMemFree(pHandle->dir.pLastValidEntry);
            pHandle->dir.pLastValidEntry = NULL;
        }

        if (flags & SHFL_LIST_RETURN_ONE)
            break; /* we're done */
    }
    Assert(rc != VINF_SUCCESS || *pcbBuffer > 0);

end:
    if (pDirEntry)
        RTMemFree(pDirEntry);

    return rc;
}

#ifdef UNITTEST
/** Unit test the SHFL_FN_READLINK API.  Located here as a form of API
 * documentation. */
void testReadLink(RTTEST hTest)
{
    /* If the number or types of parameters are wrong the API should fail. */
    testReadLinkBadParameters(hTest);
    /* Add tests as required... */
}
#endif
int vbsfReadLink(SHFLCLIENTDATA *pClient, SHFLROOT root, SHFLSTRING *pPath, uint32_t cbPath, uint8_t *pBuffer, uint32_t cbBuffer)
{
    int rc = VINF_SUCCESS;

    if (pPath == 0 || pBuffer == 0)
    {
        AssertFailed();
        return VERR_INVALID_PARAMETER;
    }

    /* Build a host full path for the given path, handle file name case issues
     * (if the guest expects case-insensitive paths but the host is
     * case-sensitive) and convert ucs2 to utf8 if necessary.
     */
    char *pszFullPath = NULL;
    uint32_t cbFullPathRoot = 0;

    rc = vbsfBuildFullPath(pClient, root, pPath, cbPath, &pszFullPath, &cbFullPathRoot);

    if (RT_SUCCESS(rc))
    {
        rc = RTSymlinkRead(pszFullPath, (char *) pBuffer, cbBuffer, 0);
        if (RT_SUCCESS(rc))
        {
            /* Convert the slashes in the link target to the guest path separator characters. */
            char *psz = (char *)pBuffer;
            while (*psz != '\0')
            {
                if (*psz == RTPATH_DELIMITER)
                    *psz = pClient->PathDelimiter;
                psz++;
            }
        }

        /* free the path string */
        vbsfFreeFullPath(pszFullPath);
    }

    return rc;
}

int vbsfQueryFileInfo(SHFLCLIENTDATA *pClient, SHFLROOT root, SHFLHANDLE Handle, uint32_t flags,
                      uint32_t *pcbBuffer, uint8_t *pBuffer)
{
    RT_NOREF2(root, flags);
    uint32_t type = vbsfQueryHandleType(pClient, Handle);
    int            rc = VINF_SUCCESS;
    SHFLFSOBJINFO   *pObjInfo = (SHFLFSOBJINFO *)pBuffer;
    RTFSOBJINFO    fileinfo;


    if (   !(type == SHFL_HF_TYPE_DIR || type == SHFL_HF_TYPE_FILE)
        || pcbBuffer == 0
        || pObjInfo == 0
        || *pcbBuffer < sizeof(SHFLFSOBJINFO))
    {
        AssertFailed();
        return VERR_INVALID_PARAMETER;
    }

    /** @todo other options */
    Assert(flags == (SHFL_INFO_GET|SHFL_INFO_FILE));

    *pcbBuffer  = 0;

    if (type == SHFL_HF_TYPE_DIR)
    {
        SHFLFILEHANDLE *pHandle = vbsfQueryDirHandle(pClient, Handle);
        rc = RTDirQueryInfo(pHandle->dir.Handle, &fileinfo, RTFSOBJATTRADD_NOTHING);
    }
    else
    {
        SHFLFILEHANDLE *pHandle = vbsfQueryFileHandle(pClient, Handle);
        rc = RTFileQueryInfo(pHandle->file.Handle, &fileinfo, RTFSOBJATTRADD_NOTHING);
#ifdef RT_OS_WINDOWS
        if (RT_SUCCESS(rc) && RTFS_IS_FILE(pObjInfo->Attr.fMode))
            pObjInfo->Attr.fMode |= 0111;
#endif
    }
    if (rc == VINF_SUCCESS)
    {
        vbfsCopyFsObjInfoFromIprt(pObjInfo, &fileinfo);
        *pcbBuffer = sizeof(SHFLFSOBJINFO);
    }
    else
        AssertFailed();

    return rc;
}

static int vbsfSetFileInfo(SHFLCLIENTDATA *pClient, SHFLROOT root, SHFLHANDLE Handle, uint32_t flags,
                           uint32_t *pcbBuffer, uint8_t *pBuffer)
{
    RT_NOREF2(root, flags);
    uint32_t type = vbsfQueryHandleType(pClient, Handle);
    int             rc = VINF_SUCCESS;
    SHFLFSOBJINFO  *pSFDEntry;

    if (   !(type == SHFL_HF_TYPE_DIR || type == SHFL_HF_TYPE_FILE)
        || pcbBuffer == 0
        || pBuffer == 0
        || *pcbBuffer < sizeof(SHFLFSOBJINFO))
    {
        AssertFailed();
        return VERR_INVALID_PARAMETER;
    }

    *pcbBuffer  = 0;
    pSFDEntry   = (SHFLFSOBJINFO *)pBuffer;

    Assert(flags == (SHFL_INFO_SET | SHFL_INFO_FILE));

    /* Change only the time values that are not zero */
    if (type == SHFL_HF_TYPE_DIR)
    {
        SHFLFILEHANDLE *pHandle = vbsfQueryDirHandle(pClient, Handle);
        rc = RTDirSetTimes(pHandle->dir.Handle,
                            (RTTimeSpecGetNano(&pSFDEntry->AccessTime)) ?       &pSFDEntry->AccessTime : NULL,
                            (RTTimeSpecGetNano(&pSFDEntry->ModificationTime)) ? &pSFDEntry->ModificationTime: NULL,
                            (RTTimeSpecGetNano(&pSFDEntry->ChangeTime)) ?       &pSFDEntry->ChangeTime: NULL,
                            (RTTimeSpecGetNano(&pSFDEntry->BirthTime)) ?        &pSFDEntry->BirthTime: NULL
                            );
    }
    else
    {
        SHFLFILEHANDLE *pHandle = vbsfQueryFileHandle(pClient, Handle);
        rc = RTFileSetTimes(pHandle->file.Handle,
                            (RTTimeSpecGetNano(&pSFDEntry->AccessTime)) ?       &pSFDEntry->AccessTime : NULL,
                            (RTTimeSpecGetNano(&pSFDEntry->ModificationTime)) ? &pSFDEntry->ModificationTime: NULL,
                            (RTTimeSpecGetNano(&pSFDEntry->ChangeTime)) ?       &pSFDEntry->ChangeTime: NULL,
                            (RTTimeSpecGetNano(&pSFDEntry->BirthTime)) ?        &pSFDEntry->BirthTime: NULL
                            );
    }
    if (rc != VINF_SUCCESS)
    {
        Log(("RTFileSetTimes failed with %Rrc\n", rc));
        Log(("AccessTime       %RX64\n", RTTimeSpecGetNano(&pSFDEntry->AccessTime)));
        Log(("ModificationTime %RX64\n", RTTimeSpecGetNano(&pSFDEntry->ModificationTime)));
        Log(("ChangeTime       %RX64\n", RTTimeSpecGetNano(&pSFDEntry->ChangeTime)));
        Log(("BirthTime        %RX64\n", RTTimeSpecGetNano(&pSFDEntry->BirthTime)));
        /* temporary hack */
        rc = VINF_SUCCESS;
    }

    if (type == SHFL_HF_TYPE_FILE)
    {
        SHFLFILEHANDLE *pHandle = vbsfQueryFileHandle(pClient, Handle);
        /* Change file attributes if necessary */
        if (pSFDEntry->Attr.fMode)
        {
            RTFMODE fMode = pSFDEntry->Attr.fMode;

#ifndef RT_OS_WINDOWS
            /* Don't allow the guest to clear the own bit, otherwise the guest wouldn't be
             * able to access this file anymore. Only for guests, which set the UNIX mode. */
            if (fMode & RTFS_UNIX_MASK)
                fMode |= RTFS_UNIX_IRUSR;
#endif

            rc = RTFileSetMode(pHandle->file.Handle, fMode);
            if (rc != VINF_SUCCESS)
            {
                Log(("RTFileSetMode %x failed with %Rrc\n", fMode, rc));
                /* silent failure, because this tends to fail with e.g. windows guest & linux host */
                rc = VINF_SUCCESS;
            }
        }
    }
    /** @todo mode for directories */

    if (rc == VINF_SUCCESS)
    {
        uint32_t bufsize = sizeof(*pSFDEntry);

        rc = vbsfQueryFileInfo(pClient, root, Handle, SHFL_INFO_GET|SHFL_INFO_FILE, &bufsize, (uint8_t *)pSFDEntry);
        if (rc == VINF_SUCCESS)
        {
            *pcbBuffer = sizeof(SHFLFSOBJINFO);
        }
        else
            AssertFailed();
    }

    return rc;
}


static int vbsfSetEndOfFile(SHFLCLIENTDATA *pClient, SHFLROOT root, SHFLHANDLE Handle, uint32_t flags,
                            uint32_t *pcbBuffer, uint8_t *pBuffer)
{
    RT_NOREF2(root, flags);
    SHFLFILEHANDLE *pHandle = vbsfQueryFileHandle(pClient, Handle);
    int             rc = VINF_SUCCESS;
    SHFLFSOBJINFO  *pSFDEntry;

    if (pHandle == 0 || pcbBuffer == 0 || pBuffer == 0 || *pcbBuffer < sizeof(SHFLFSOBJINFO))
    {
        AssertFailed();
        return VERR_INVALID_PARAMETER;
    }

    *pcbBuffer  = 0;
    pSFDEntry   = (SHFLFSOBJINFO *)pBuffer;

    if (flags & SHFL_INFO_SIZE)
    {
        rc = RTFileSetSize(pHandle->file.Handle, pSFDEntry->cbObject);
        if (rc != VINF_SUCCESS)
            AssertFailed();
    }
    else
        AssertFailed();

    if (rc == VINF_SUCCESS)
    {
        RTFSOBJINFO fileinfo;

        /* Query the new object info and return it */
        rc = RTFileQueryInfo(pHandle->file.Handle, &fileinfo, RTFSOBJATTRADD_NOTHING);
        if (rc == VINF_SUCCESS)
        {
#ifdef RT_OS_WINDOWS
            fileinfo.Attr.fMode |= 0111;
#endif
            vbfsCopyFsObjInfoFromIprt(pSFDEntry, &fileinfo);
            *pcbBuffer = sizeof(SHFLFSOBJINFO);
        }
        else
            AssertFailed();
    }

    return rc;
}

int vbsfQueryVolumeInfo(SHFLCLIENTDATA *pClient, SHFLROOT root, uint32_t flags, uint32_t *pcbBuffer, uint8_t *pBuffer)
{
    RT_NOREF2(root, flags);
    int            rc = VINF_SUCCESS;
    SHFLVOLINFO   *pSFDEntry;
    char          *pszFullPath = NULL;
    SHFLSTRING     dummy;

    if (pcbBuffer == 0 || pBuffer == 0 || *pcbBuffer < sizeof(SHFLVOLINFO))
    {
        AssertFailed();
        return VERR_INVALID_PARAMETER;
    }

    /** @todo other options */
    Assert(flags == (SHFL_INFO_GET|SHFL_INFO_VOLUME));

    *pcbBuffer  = 0;
    pSFDEntry   = (PSHFLVOLINFO)pBuffer;

    ShflStringInitBuffer(&dummy, sizeof(dummy));
    dummy.String.ucs2[0] = '\0';
    rc = vbsfBuildFullPath(pClient, root, &dummy, sizeof(dummy), &pszFullPath, NULL);

    if (RT_SUCCESS(rc))
    {
        rc = RTFsQuerySizes(pszFullPath, &pSFDEntry->ullTotalAllocationBytes, &pSFDEntry->ullAvailableAllocationBytes, &pSFDEntry->ulBytesPerAllocationUnit, &pSFDEntry->ulBytesPerSector);
        if (rc != VINF_SUCCESS)
            goto exit;

        rc = RTFsQuerySerial(pszFullPath, &pSFDEntry->ulSerial);
        if (rc != VINF_SUCCESS)
            goto exit;

        RTFSPROPERTIES FsProperties;
        rc = RTFsQueryProperties(pszFullPath, &FsProperties);
        if (rc != VINF_SUCCESS)
            goto exit;
        vbfsCopyFsPropertiesFromIprt(&pSFDEntry->fsProperties, &FsProperties);

        *pcbBuffer = sizeof(SHFLVOLINFO);
    }
    else AssertFailed();

exit:
    AssertMsg(rc == VINF_SUCCESS, ("failure: rc = %Rrc\n", rc));
    /* free the path string */
    vbsfFreeFullPath(pszFullPath);
    return rc;
}

int vbsfQueryFSInfo(SHFLCLIENTDATA *pClient, SHFLROOT root, SHFLHANDLE Handle, uint32_t flags, uint32_t *pcbBuffer, uint8_t *pBuffer)
{
    if (pcbBuffer == 0 || pBuffer == 0)
    {
        AssertFailed();
        return VERR_INVALID_PARAMETER;
    }

    if (flags & SHFL_INFO_FILE)
        return vbsfQueryFileInfo(pClient, root, Handle, flags, pcbBuffer, pBuffer);

    if (flags & SHFL_INFO_VOLUME)
        return vbsfQueryVolumeInfo(pClient, root, flags, pcbBuffer, pBuffer);

    AssertFailed();
    return VERR_INVALID_PARAMETER;
}

#ifdef UNITTEST
/** Unit test the SHFL_FN_INFORMATION API.  Located here as a form of API
 * documentation. */
void testFSInfo(RTTEST hTest)
{
    /* If the number or types of parameters are wrong the API should fail. */
    testFSInfoBadParameters(hTest);
    /* Basic get and set file size test. */
    testFSInfoQuerySetFMode(hTest);
    /* Basic get and set dir atime test. */
    testFSInfoQuerySetDirATime(hTest);
    /* Basic get and set file atime test. */
    testFSInfoQuerySetFileATime(hTest);
    /* Basic set end of file. */
    testFSInfoQuerySetEndOfFile(hTest);
    /* Add tests as required... */
}
#endif
int vbsfSetFSInfo(SHFLCLIENTDATA *pClient, SHFLROOT root, SHFLHANDLE Handle, uint32_t flags, uint32_t *pcbBuffer, uint8_t *pBuffer)
{
    uint32_t type =   vbsfQueryHandleType(pClient, Handle)
                    & (SHFL_HF_TYPE_DIR|SHFL_HF_TYPE_FILE|SHFL_HF_TYPE_VOLUME);

    if (type == 0 || pcbBuffer == 0 || pBuffer == 0)
    {
        AssertFailed();
        return VERR_INVALID_PARAMETER;
    }

    /* is the guest allowed to write to this share? */
    bool fWritable;
    int rc = vbsfMappingsQueryWritable(pClient, root, &fWritable);
    if (RT_FAILURE(rc) || !fWritable)
        return VERR_WRITE_PROTECT;

    if (flags & SHFL_INFO_FILE)
        return vbsfSetFileInfo(pClient, root, Handle, flags, pcbBuffer, pBuffer);

    if (flags & SHFL_INFO_SIZE)
        return vbsfSetEndOfFile(pClient, root, Handle, flags, pcbBuffer, pBuffer);

//    if (flags & SHFL_INFO_VOLUME)
//        return vbsfVolumeInfo(pClient, root, Handle, flags, pcbBuffer, pBuffer);
    AssertFailed();
    return VERR_INVALID_PARAMETER;
}

#ifdef UNITTEST
/** Unit test the SHFL_FN_LOCK API.  Located here as a form of API
 * documentation. */
void testLock(RTTEST hTest)
{
    /* If the number or types of parameters are wrong the API should fail. */
    testLockBadParameters(hTest);
    /* Simple file locking and unlocking test. */
    testLockFileSimple(hTest);
    /* Add tests as required... */
}
#endif

int vbsfLock(SHFLCLIENTDATA *pClient, SHFLROOT root, SHFLHANDLE Handle, uint64_t offset, uint64_t length, uint32_t flags)
{
    RT_NOREF1(root);
    SHFLFILEHANDLE *pHandle = vbsfQueryFileHandle(pClient, Handle);
    uint32_t        fRTLock = 0;
    int             rc;

    Assert((flags & SHFL_LOCK_MODE_MASK) != SHFL_LOCK_CANCEL);

    if (pHandle == 0)
    {
        AssertFailed();
        return VERR_INVALID_HANDLE;
    }
    if (   ((flags & SHFL_LOCK_MODE_MASK) == SHFL_LOCK_CANCEL)
        || (flags & SHFL_LOCK_ENTIRE)
       )
    {
        AssertFailed();
        return VERR_INVALID_PARAMETER;
    }

    /* Lock type */
    switch(flags & SHFL_LOCK_MODE_MASK)
    {
    case SHFL_LOCK_SHARED:
        fRTLock = RTFILE_LOCK_READ;
        break;

    case SHFL_LOCK_EXCLUSIVE:
        fRTLock = RTFILE_LOCK_READ | RTFILE_LOCK_WRITE;
        break;

    default:
        AssertFailed();
        return VERR_INVALID_PARAMETER;
    }

    /* Lock wait type */
    if (flags & SHFL_LOCK_WAIT)
        fRTLock |= RTFILE_LOCK_WAIT;
    else
        fRTLock |= RTFILE_LOCK_IMMEDIATELY;

#ifdef RT_OS_WINDOWS
    rc = RTFileLock(pHandle->file.Handle, fRTLock, offset, length);
    if (rc != VINF_SUCCESS)
        Log(("RTFileLock %RTfile %RX64 %RX64 failed with %Rrc\n", pHandle->file.Handle, offset, length, rc));
#else
    Log(("vbsfLock: Pretend success handle=%x\n", Handle));
    rc = VINF_SUCCESS;
    RT_NOREF2(offset,  length);
#endif
    return rc;
}

int vbsfUnlock(SHFLCLIENTDATA *pClient, SHFLROOT root, SHFLHANDLE Handle, uint64_t offset, uint64_t length, uint32_t flags)
{
    RT_NOREF1(root);
    SHFLFILEHANDLE *pHandle = vbsfQueryFileHandle(pClient, Handle);
    int             rc;

    Assert((flags & SHFL_LOCK_MODE_MASK) == SHFL_LOCK_CANCEL);

    if (pHandle == 0)
    {
        return VERR_INVALID_HANDLE;
    }
    if (   ((flags & SHFL_LOCK_MODE_MASK) != SHFL_LOCK_CANCEL)
        || (flags & SHFL_LOCK_ENTIRE)
       )
    {
       return VERR_INVALID_PARAMETER;
    }

#ifdef RT_OS_WINDOWS
    rc = RTFileUnlock(pHandle->file.Handle, offset, length);
    if (rc != VINF_SUCCESS)
        Log(("RTFileUnlock %RTfile %RX64 %RTX64 failed with %Rrc\n", pHandle->file.Handle, offset, length, rc));
#else
    Log(("vbsfUnlock: Pretend success handle=%x\n", Handle));
    rc = VINF_SUCCESS;
    RT_NOREF2(offset,  length);
#endif

    return rc;
}


#ifdef UNITTEST
/** Unit test the SHFL_FN_REMOVE API.  Located here as a form of API
 * documentation. */
void testRemove(RTTEST hTest)
{
    /* If the number or types of parameters are wrong the API should fail. */
    testRemoveBadParameters(hTest);
    /* Add tests as required... */
}
#endif
int vbsfRemove(SHFLCLIENTDATA *pClient, SHFLROOT root, SHFLSTRING *pPath, uint32_t cbPath, uint32_t flags)
{
    int rc = VINF_SUCCESS;

    /* Validate input */
    if (   flags & ~(SHFL_REMOVE_FILE|SHFL_REMOVE_DIR|SHFL_REMOVE_SYMLINK)
        || cbPath == 0
        || pPath == 0)
    {
        AssertFailed();
        return VERR_INVALID_PARAMETER;
    }

    /* Build a host full path for the given path
     * and convert ucs2 to utf8 if necessary.
     */
    char *pszFullPath = NULL;

    rc = vbsfBuildFullPath(pClient, root, pPath, cbPath, &pszFullPath, NULL);
    if (RT_SUCCESS(rc))
    {
        /* is the guest allowed to write to this share? */
        bool fWritable;
        rc = vbsfMappingsQueryWritable(pClient, root, &fWritable);
        if (RT_FAILURE(rc) || !fWritable)
            rc = VERR_WRITE_PROTECT;

        if (RT_SUCCESS(rc))
        {
            if (flags & SHFL_REMOVE_SYMLINK)
                rc = RTSymlinkDelete(pszFullPath, 0);
            else if (flags & SHFL_REMOVE_FILE)
                rc = RTFileDelete(pszFullPath);
            else
                rc = RTDirRemove(pszFullPath);
        }

#ifndef DEBUG_dmik
        // VERR_ACCESS_DENIED for example?
        // Assert(rc == VINF_SUCCESS || rc == VERR_DIR_NOT_EMPTY);
#endif
        /* free the path string */
        vbsfFreeFullPath(pszFullPath);
    }
    return rc;
}


#ifdef UNITTEST
/** Unit test the SHFL_FN_RENAME API.  Located here as a form of API
 * documentation. */
void testRename(RTTEST hTest)
{
    /* If the number or types of parameters are wrong the API should fail. */
    testRenameBadParameters(hTest);
    /* Add tests as required... */
}
#endif
int vbsfRename(SHFLCLIENTDATA *pClient, SHFLROOT root, SHFLSTRING *pSrc, SHFLSTRING *pDest, uint32_t flags)
{
    int rc = VINF_SUCCESS;

    /* Validate input */
    if (   flags & ~(SHFL_REMOVE_FILE|SHFL_REMOVE_DIR|SHFL_RENAME_REPLACE_IF_EXISTS)
        || pSrc == 0
        || pDest == 0)
    {
        AssertFailed();
        return VERR_INVALID_PARAMETER;
    }

    /* Build a host full path for the given path
     * and convert ucs2 to utf8 if necessary.
     */
    char *pszFullPathSrc = NULL;
    char *pszFullPathDest = NULL;

    rc = vbsfBuildFullPath(pClient, root, pSrc, pSrc->u16Size + SHFLSTRING_HEADER_SIZE, &pszFullPathSrc, NULL);
    if (rc != VINF_SUCCESS)
        return rc;

    rc = vbsfBuildFullPath(pClient, root, pDest, pDest->u16Size + SHFLSTRING_HEADER_SIZE, &pszFullPathDest, NULL, false, true);
    if (RT_SUCCESS (rc))
    {
        Log(("Rename %s to %s\n", pszFullPathSrc, pszFullPathDest));

        /* is the guest allowed to write to this share? */
        bool fWritable;
        rc = vbsfMappingsQueryWritable(pClient, root, &fWritable);
        if (RT_FAILURE(rc) || !fWritable)
            rc = VERR_WRITE_PROTECT;

        if (RT_SUCCESS(rc))
        {
            if (flags & SHFL_RENAME_FILE)
            {
                rc = RTFileMove(pszFullPathSrc, pszFullPathDest,
                                  ((flags & SHFL_RENAME_REPLACE_IF_EXISTS) ? RTFILEMOVE_FLAGS_REPLACE : 0));
            }
            else
            {
                /* NT ignores the REPLACE flag and simply return and already exists error. */
                rc = RTDirRename(pszFullPathSrc, pszFullPathDest,
                                   ((flags & SHFL_RENAME_REPLACE_IF_EXISTS) ? RTPATHRENAME_FLAGS_REPLACE : 0));
            }
        }

        /* free the path string */
        vbsfFreeFullPath(pszFullPathDest);
    }
    /* free the path string */
    vbsfFreeFullPath(pszFullPathSrc);
    return rc;
}

#ifdef UNITTEST
/** Unit test the SHFL_FN_SYMLINK API.  Located here as a form of API
 * documentation. */
void testSymlink(RTTEST hTest)
{
    /* If the number or types of parameters are wrong the API should fail. */
    testSymlinkBadParameters(hTest);
    /* Add tests as required... */
}
#endif
int vbsfSymlink(SHFLCLIENTDATA *pClient, SHFLROOT root, SHFLSTRING *pNewPath, SHFLSTRING *pOldPath, SHFLFSOBJINFO *pInfo)
{
    int rc = VINF_SUCCESS;

    char *pszFullNewPath = NULL;
    char *pszFullOldPath = NULL;

    /* XXX: no support for UCS2 at the moment. */
    if (!BIT_FLAG(pClient->fu32Flags, SHFL_CF_UTF8))
        return VERR_NOT_IMPLEMENTED;

    bool fSymlinksCreate;
    rc = vbsfMappingsQuerySymlinksCreate(pClient, root, &fSymlinksCreate);
    AssertRCReturn(rc, rc);
    if (!fSymlinksCreate)
        return VERR_WRITE_PROTECT; /* XXX or VERR_TOO_MANY_SYMLINKS? */

    rc = vbsfBuildFullPath(pClient, root, pNewPath, pNewPath->u16Size + SHFLSTRING_HEADER_SIZE, &pszFullNewPath, NULL);
    AssertRCReturn(rc, rc);

    /* Verify that the link target can be a valid host path, i.e. does not contain invalid characters. */
    uint32_t fu32PathFlags = 0;
    uint32_t fu32Options = 0;
    rc = vbsfPathGuestToHost(pClient, root, pOldPath, pOldPath->u16Size + SHFLSTRING_HEADER_SIZE,
                             &pszFullOldPath, NULL, fu32Options, &fu32PathFlags);
    if (RT_FAILURE(rc))
    {
        vbsfFreeFullPath(pszFullNewPath);
        return rc;
    }

    rc = RTSymlinkCreate(pszFullNewPath, (const char *)pOldPath->String.utf8,
                         RTSYMLINKTYPE_UNKNOWN, 0);
    if (RT_SUCCESS(rc))
    {
        RTFSOBJINFO info;
        rc = RTPathQueryInfoEx(pszFullNewPath, &info, RTFSOBJATTRADD_NOTHING, SHFL_RT_LINK(pClient));
        if (RT_SUCCESS(rc))
            vbfsCopyFsObjInfoFromIprt(pInfo, &info);
    }

    vbsfFreeFullPath(pszFullOldPath);
    vbsfFreeFullPath(pszFullNewPath);

    return rc;
}

/*
 * Clean up our mess by freeing all handles that are still valid.
 *
 */
int vbsfDisconnect(SHFLCLIENTDATA *pClient)
{
    for (int i=0; i<SHFLHANDLE_MAX; i++)
    {
        SHFLHANDLE Handle = (SHFLHANDLE)i;
        if (vbsfQueryHandleType(pClient, Handle))
        {
            Log(("Open handle %08x\n", i));
            vbsfClose(pClient, SHFL_HANDLE_ROOT /* incorrect, but it's not important */, (SHFLHANDLE)i);
        }
    }
    return VINF_SUCCESS;
}