source: vbox/trunk/src/VBox/HostServices/SharedFolders/vbsf.cpp@ 32689

/** @file
 *
 * Shared Folders:
 * VBox Shared Folders.
 */

/*
 * Copyright (C) 2006-2007 Oracle Corporation
 *
 * This file is part of VirtualBox Open Source Edition (OSE), as
 * available from http://www.virtualbox.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.
 */

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

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

#undef LogFlow
#define LogFlow Log

/**
 * @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 vbsfCorrectCasing(char *pszFullPath, char *pszStartComponent)
{
    PRTDIRENTRYEX  pDirEntry = NULL;
    uint32_t       cbDirEntry, cbComponent;
    int            rc = VERR_FILE_NOT_FOUND;
    PRTDIR         hSearch = 0;
    char           szWildCard[4];

    Log2(("vbsfCorrectCasing: %s %s\n", pszFullPath, pszStartComponent));

    cbComponent = (uint32_t) strlen(pszStartComponent);

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

    /** @todo this is quite inefficient, especially for directories with many files */
    Assert(pszFullPath < pszStartComponent-1);
    Assert(*(pszStartComponent-1) == RTPATH_DELIMITER);
    *(pszStartComponent-1) = 0;
    strcpy(pDirEntry->szName, pszFullPath);
    szWildCard[0] = RTPATH_DELIMITER;
    szWildCard[1] = '*';
    szWildCard[2] = 0;
    strcat(pDirEntry->szName, szWildCard);

    rc = RTDirOpenFiltered (&hSearch, pDirEntry->szName, RTDIRFILTER_WINNT);
    *(pszStartComponent-1) = RTPATH_DELIMITER;
    if (RT_FAILURE(rc))
        goto end;

    for (;;)
    {
        size_t cbDirEntrySize = cbDirEntry;

        rc = RTDirReadEx(hSearch, pDirEntry, &cbDirEntrySize, RTFSOBJATTRADD_NOTHING, RTPATH_F_FOLLOW_LINK);
        if (rc == VERR_NO_MORE_FILES)
            break;

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

        Log2(("vbsfCorrectCasing: found %s\n", &pDirEntry->szName[0]));
        if (    pDirEntry->cbName == cbComponent
            &&  !RTStrICmp(pszStartComponent, &pDirEntry->szName[0]))
        {
            Log(("Found original name %s (%s)\n", &pDirEntry->szName[0], pszStartComponent));
            strcpy(pszStartComponent, &pDirEntry->szName[0]);
            rc = VINF_SUCCESS;
            break;
        }
    }

end:
    if (RT_FAILURE(rc))
        Log(("vbsfCorrectCasing %s failed with %d\n", pszStartComponent, rc));

    if (pDirEntry)
        RTMemFree(pDirEntry);

    if (hSearch)
        RTDirClose(hSearch);
    return rc;
}

static int vbsfPathCheck(const char *pUtf8Path, size_t cbPath)
{
    int rc = VINF_SUCCESS;

    /* The pUtf8Path is what the guest sent. Verify that the path is within the root.
     * Count '..' and other path components and check that we do not go over the root.
     */

    size_t i = 0;
    int cComponents = 0; /* How many normal path components. */
    int cParentDirs = 0; /* How many '..' components. */

    for (;;)
    {
        /* Skip leading path delimiters. */
        while (   i < cbPath
               && (pUtf8Path[i] == '\\' || pUtf8Path[i] == '/'))
            i++;

        if (i >= cbPath)
            break;

        /* Check if that is a dot component. */
        int cDots = 0;
        while (i < cbPath && pUtf8Path[i] == '.')
        {
            cDots++;
            i++;
        }

        if (   cDots >= 2 /* Consider all multidots sequences as a 'parent dir'. */
            && (i >= cbPath || (pUtf8Path[i] == '\\' || pUtf8Path[i] == '/')))
        {
            cParentDirs++;
        }
        else if (   cDots == 1
                 && (i >= cbPath || (pUtf8Path[i] == '\\' || pUtf8Path[i] == '/')))
        {
            /* Single dot, nothing changes. */
        }
        else
        {
            /* Skip this component. */
            while (   i < cbPath
                   && (pUtf8Path[i] != '\\' && pUtf8Path[i] != '/'))
                i++;

            cComponents++;
        }

        Assert(i >= cbPath || (pUtf8Path[i] == '\\' || pUtf8Path[i] == '/'));

        /* Verify counters for every component. */
        if (cParentDirs > cComponents)
        {
            rc = VERR_INVALID_NAME;
            break;
        }
    }

    return rc;
}

static int vbsfBuildFullPath (SHFLCLIENTDATA *pClient, SHFLROOT root, PSHFLSTRING pPath,
                              uint32_t cbPath, char **ppszFullPath, uint32_t *pcbFullPathRoot,
                              bool fWildCard = false, bool fPreserveLastComponent = false)
{
    int rc = VINF_SUCCESS;

    char *pszFullPath = NULL;

    /* Query UCS2 root prefix for the path, cbRoot is the length in bytes including trailing (RTUTF16)0. */
    uint32_t cbRoot = 0;
    PCRTUTF16 pwszRoot = vbsfMappingsQueryHostRoot (root, &cbRoot);

    if (!pwszRoot || cbRoot == 0)
    {
        Log(("vbsfBuildFullPath: invalid root!\n"));
        return VERR_INVALID_PARAMETER;
    }

    if (BIT_FLAG(pClient->fu32Flags, SHFL_CF_UTF8))
    {
        char *utf8Root;

        /* Verify that the path is under the root directory. */
        rc = vbsfPathCheck((const char *)&pPath->String.utf8[0], pPath->u16Length);

        if (RT_SUCCESS (rc))
        {
            rc = RTUtf16ToUtf8 (pwszRoot, &utf8Root);
        }

        if (RT_SUCCESS (rc))
        {
            size_t cbUtf8Root, cbUtf8FullPath;
            char *utf8FullPath;

            cbUtf8Root = strlen (utf8Root);
            cbUtf8FullPath = cbUtf8Root + 1 + pPath->u16Length + 1;
            utf8FullPath = (char *) RTMemAllocZ (cbUtf8FullPath);

            if (!utf8FullPath)
            {
                rc = VERR_NO_MEMORY;
                *ppszFullPath = NULL;
                Log(("RTMemAllocZ %x failed!!\n", cbUtf8FullPath));
            }
            else
            {
                memcpy (utf8FullPath, utf8Root, cbUtf8Root);
                memcpy (utf8FullPath + cbUtf8Root + 1,
                        &pPath->String.utf8[0],
                        pPath->u16Length);

                utf8FullPath[cbUtf8Root] = '/';
                utf8FullPath[cbUtf8FullPath - 1] = 0;
                pszFullPath = utf8FullPath;

                if (pcbFullPathRoot)
                    *pcbFullPathRoot = (uint32_t)cbUtf8Root; /* Must index the path delimiter.  */
            }

            RTStrFree (utf8Root);
        }
        else
        {
            Log (("vbsfBuildFullPath: RTUtf16ToUtf8 failed with %Rrc\n", rc));
        }
    }
    else
    {
#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 (virtaul) file
 * system level in darwin, or just by the user mode application libs. */
        SHFLSTRING *pPathParameter = pPath;
        size_t cbPathLength;
        CFMutableStringRef inStr = ::CFStringCreateMutable(NULL, 0);
        uint16_t ucs2Length;
        CFRange rangeCharacters;

        // Is 8 times length enough for decomposed in worst case...?
        cbPathLength = sizeof(SHFLSTRING) + pPathParameter->u16Length * 8 + 2;
        pPath = (SHFLSTRING *)RTMemAllocZ (cbPathLength);
        if (!pPath)
        {
            rc = VERR_NO_MEMORY;
            Log(("RTMemAllocZ %x failed!!\n", cbPathLength));
            return rc;
        }

        ::CFStringAppendCharacters(inStr, (UniChar*)pPathParameter->String.ucs2, pPathParameter->u16Length / sizeof(pPathParameter->String.ucs2[0]));
        ::CFStringNormalize(inStr, kCFStringNormalizationFormD);
        ucs2Length = ::CFStringGetLength(inStr);

        rangeCharacters.location = 0;
        rangeCharacters.length = ucs2Length;
        ::CFStringGetCharacters(inStr, rangeCharacters, pPath->String.ucs2);
        pPath->String.ucs2[ucs2Length] = 0x0000; // NULL terminated
        pPath->u16Length = ucs2Length * sizeof(pPath->String.ucs2[0]);
        pPath->u16Size = pPath->u16Length + sizeof(pPath->String.ucs2[0]);

        CFRelease(inStr);
#endif
        /* Client sends us UCS2, so convert it to UTF8. */
        Log(("Root %ls path %.*ls\n", pwszRoot, pPath->u16Length/sizeof(pPath->String.ucs2[0]), pPath->String.ucs2));

        /* Allocate buffer that will be able to contain
         * the root prefix and the pPath converted to UTF8.
         * Expect a 2 bytes UCS2 to be converted to 8 bytes UTF8
         * in worst case.
         */
        uint32_t cbFullPath = (cbRoot/sizeof (RTUTF16) + ShflStringLength (pPath)) * 4;

        pszFullPath = (char *)RTMemAllocZ (cbFullPath);

        if (!pszFullPath)
        {
            rc = VERR_NO_MEMORY;
        }
        else
        {
            uint32_t cb = cbFullPath;

            rc = RTUtf16ToUtf8Ex (pwszRoot, RTSTR_MAX, &pszFullPath, cb, NULL);
            if (RT_FAILURE(rc))
            {
                AssertFailed();
#ifdef RT_OS_DARWIN
                RTMemFree(pPath);
                pPath = pPathParameter;
#endif
                return rc;
            }

            char *dst = pszFullPath;

            cbRoot = (uint32_t)strlen(dst);
            if (dst[cbRoot - 1] != RTPATH_DELIMITER)
            {
                dst[cbRoot] = RTPATH_DELIMITER;
                cbRoot++;
            }

            if (pcbFullPathRoot)
                *pcbFullPathRoot = cbRoot - 1; /* Must index the path delimiter.  */

            dst   += cbRoot;
            cb    -= cbRoot;

            if (pPath->u16Length)
            {
                /* Convert and copy components. */
                PRTUTF16 src = &pPath->String.ucs2[0];

                /* Correct path delimiters */
                if (pClient->PathDelimiter != RTPATH_DELIMITER)
                {
                    LogFlow(("Correct path delimiter in %ls\n", src));
                    while (*src)
                    {
                        if (*src == pClient->PathDelimiter)
                            *src = RTPATH_DELIMITER;
                        src++;
                    }
                    src = &pPath->String.ucs2[0];
                    LogFlow(("Corrected string %ls\n", src));
                }
                if (*src == RTPATH_DELIMITER)
                    src++;  /* we already appended a delimiter to the first part */

                rc = RTUtf16ToUtf8Ex (src, RTSTR_MAX, &dst, cb, NULL);
                if (RT_FAILURE(rc))
                {
                    AssertFailed();
#ifdef RT_OS_DARWIN
                    RTMemFree(pPath);
                    pPath = pPathParameter;
#endif
                    return rc;
                }

                uint32_t l = (uint32_t)strlen (dst);

                /* Verify that the path is under the root directory. */
                rc = vbsfPathCheck(dst, l);

                if (RT_FAILURE(rc))
                {
#ifdef RT_OS_DARWIN
                    RTMemFree(pPath);
                    pPath = pPathParameter;
#endif
                    return rc;
                }

                cb -= l;
                dst += l;

                Assert(cb > 0);
            }

            /* Nul terminate the string */
            *dst = 0;
        }
#ifdef RT_OS_DARWIN
        RTMemFree(pPath);
        pPath = pPathParameter;
#endif
    }

    if (RT_SUCCESS (rc))
    {
        /* When the host file system is case sensitive and the guest expects a case insensitive fs, then problems can occur */
        if (     vbsfIsHostMappingCaseSensitive (root)
            &&  !vbsfIsGuestMappingCaseSensitive(root))
        {
            RTFSOBJINFO info;
            char *pszLastComponent = NULL;

            if (fWildCard || fPreserveLastComponent)
            {
                /* strip off the last path component, that has to be preserved: contains the wildcard(s) or a 'rename' target. */
                uint32_t len = (uint32_t)strlen(pszFullPath);
                char    *src = pszFullPath + len - 1;

                while(src > pszFullPath)
                {
                    if (*src == RTPATH_DELIMITER)
                        break;
                    src--;
                }
                if (*src == RTPATH_DELIMITER)
                {
                    bool fHaveWildcards = false;
                    char *temp = src;

                    while(*temp)
                    {
                        char uc = *temp;
                        if (uc == '*' || uc == '?' || uc == '>' || uc == '<' || uc == '"')
                        {
                            fHaveWildcards = true;
                            break;
                        }
                        temp++;
                    }

                    if (fHaveWildcards || fPreserveLastComponent)
                    {
                        pszLastComponent = src;
                        *pszLastComponent = 0;
                    }
                }
            }

            /** @todo don't check when creating files or directories; waste of time */
            rc = RTPathQueryInfoEx(pszFullPath, &info, RTFSOBJATTRADD_NOTHING, RTPATH_F_FOLLOW_LINK);
            if (rc == VERR_FILE_NOT_FOUND || rc == VERR_PATH_NOT_FOUND)
            {
                uint32_t len = (uint32_t)strlen(pszFullPath);
                char    *src = pszFullPath + len - 1;

                Log(("Handle case insenstive guest fs on top of host case sensitive fs for %s\n", pszFullPath));

                /* Find partial path that's valid */
                while(src > pszFullPath)
                {
                    if (*src == RTPATH_DELIMITER)
                    {
                        *src = 0;
                        rc = RTPathQueryInfoEx(pszFullPath, &info, RTFSOBJATTRADD_NOTHING, RTPATH_F_FOLLOW_LINK);
                        *src = RTPATH_DELIMITER;
                        if (rc == VINF_SUCCESS)
                        {
#ifdef DEBUG
                            *src = 0;
                            Log(("Found valid partial path %s\n", pszFullPath));
                            *src = RTPATH_DELIMITER;
#endif
                            break;
                        }
                    }

                    src--;
                }
                Assert(*src == RTPATH_DELIMITER && RT_SUCCESS(rc));
                if (    *src == RTPATH_DELIMITER
                    &&  RT_SUCCESS(rc))
                {
                    src++;
                    for (;;)
                    {
                        char *end = src;
                        bool fEndOfString = true;

                        while(*end)
                        {
                            if (*end == RTPATH_DELIMITER)
                                break;
                            end++;
                        }

                        if (*end == RTPATH_DELIMITER)
                        {
                            fEndOfString = false;
                            *end = 0;
                            rc = RTPathQueryInfoEx(src, &info, RTFSOBJATTRADD_NOTHING, RTPATH_F_FOLLOW_LINK);
                            Assert(rc == VINF_SUCCESS || rc == VERR_FILE_NOT_FOUND || rc == VERR_PATH_NOT_FOUND);
                        }
                        else
                        if (end == src)
                            rc = VINF_SUCCESS;  /* trailing delimiter */
                        else
                            rc = VERR_FILE_NOT_FOUND;

                        if (rc == VERR_FILE_NOT_FOUND || rc == VERR_PATH_NOT_FOUND)
                        {
                            /* path component is invalid; try to correct the casing */
                            rc = vbsfCorrectCasing(pszFullPath, src);
                            if (RT_FAILURE(rc))
                            {
                                if (!fEndOfString)
                                    *end = RTPATH_DELIMITER; /* restore the original full path */
                                break;
                            }
                        }

                        if (fEndOfString)
                            break;

                        *end = RTPATH_DELIMITER;
                        src = end + 1;
                    }
                    if (RT_FAILURE(rc))
                        Log(("Unable to find suitable component rc=%d\n", rc));
                }
                else
                    rc = VERR_FILE_NOT_FOUND;

            }
            if (pszLastComponent)
                *pszLastComponent = RTPATH_DELIMITER;

            /* might be a new file so don't fail here! */
            rc = VINF_SUCCESS;
        }
        *ppszFullPath = pszFullPath;

        LogFlow(("vbsfBuildFullPath: %s rc=%Rrc\n", pszFullPath, rc));
    }

    return rc;
}

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

/**
 * Convert shared folder create flags (see include/iprt/shflsvc.h) into iprt create flags.
 *
 * @returns iprt status code
 * @param  fShflFlags shared folder create flags
 * @param  fMode      file attibutes
 * @retval pfOpen     iprt create flags
 */
static int vbsfConvertFileOpenFlags(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:
        {
            /** @todo treat this as read access, but theoretically this could be a no access request. */
            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))
    {
        *pfOpen = fOpen;
    }
    return rc;
}

/**
 * Open a file or create and open a new one.
 *
 * @returns IPRT status code
 * @param  pszPath               Path to the file or folder on the host.
 * @param  pParms->CreateFlags   Creation or open parameters, see include/VBox/shflsvc.h
 * @param  pParms->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->Result        Shared folder status code, see include/VBox/shflsvc.h
 * @retval pParms->Handle        On success the (shared folder) handle of the file opened or
 *                               created
 * @retval pParms->Info          On success the parameters of the file opened or created
 */
static int vbsfOpenFile (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;

    int rc = vbsfConvertFileOpenFlags(pParms->CreateFlags, pParms->Info.Attr.fMode, pParms->Handle, &fOpen);
    if (RT_SUCCESS(rc))
    {
        handle  = vbsfAllocFileHandle();
    }
    if (SHFL_HANDLE_NIL != handle)
    {
        rc = VERR_NO_MEMORY;  /* If this fails - rewritten immediately on success. */
        pHandle = (SHFLFILEHANDLE *)vbsfQueryHandle(handle, SHFL_HF_TYPE_FILE);
    }
    if (0 != 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, RTPATH_F_FOLLOW_LINK)))
            {
#ifdef RT_OS_WINDOWS
                info.Attr.fMode |= 0111;
#endif
                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 || RT_OS_SOLARIS
                if (cErrors < 1)
                    LogRel(("SharedFolders host service: Try to increase the limit for open files (ulimt -n)\n"));
#endif
                cErrors++;
            }
            pParms->Result = SHFL_NO_RESULT;
            break;
        default:
            pParms->Result = SHFL_NO_RESULT;
        }
    }

    if (RT_SUCCESS(rc))
    {
        /** @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
            pParms->Info = info;
        }
    }
    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 (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  pszPath               Path to the file or folder on the host.
 * @param  pParms->CreateFlags   Creation or open parameters, see include/VBox/shflsvc.h
 * @retval pParms->Result        Shared folder status code, see include/VBox/shflsvc.h
 * @retval pParms->Handle        On success the (shared folder) handle of the folder opened or
 *                               created
 * @retval pParms->Info          On success the parameters of the folder opened or created
 *
 * @note folders are created with fMode = 0777
 */
static int vbsfOpenDir (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();
    SHFLFILEHANDLE *pHandle = (SHFLFILEHANDLE *)vbsfQueryHandle(handle, SHFL_HF_TYPE_DIR);
    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);
            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 = RTDirOpen (&pHandle->dir.Handle, pszPath);
            if (RT_SUCCESS(rc))
            {
                RTFSOBJINFO info;

                rc = RTDirQueryInfo (pHandle->dir.Handle, &info, RTFSOBJATTRADD_NOTHING);
                if (RT_SUCCESS(rc))
                {
                    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 (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   pszFullPath    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(char *pszPath, SHFLCREATEPARMS *pParms)
{
    RTFSOBJINFO info;
    int rc;

    rc = RTPathQueryInfoEx(pszPath, &info, RTFSOBJATTRADD_NOTHING, RTPATH_F_FOLLOW_LINK);
    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
            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;
}

/**
 * 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->Info   If a new file is created or an old one overwritten, set
 *                         these attributes
 * @retval  pParms->Result Shared folder result code, see include/VBox/shflsvc.h
 * @retval  pParms->Handle Shared folder handle to the newly opened file
 * @retval  pParms->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(pszFullPath, pParms);
        }
        else
        {
            /* Query path information. */
            RTFSOBJINFO info;

            rc = RTPathQueryInfoEx(pszFullPath, &info, RTFSOBJATTRADD_NOTHING, RTPATH_F_FOLLOW_LINK);
            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 (pszFullPath, pParms);
                }
                else
                {
                    rc = vbsfOpenFile (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;
}

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

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

    SHFLFILEHANDLE *pHandle = (SHFLFILEHANDLE *)vbsfQueryHandle(Handle, SHFL_HF_TYPE_DIR|SHFL_HF_TYPE_FILE);
    Assert(pHandle);
    if (!pHandle)
        return VERR_INVALID_HANDLE;

    switch (ShflHandleType (&pHandle->Header))
    {
        case SHFL_HF_TYPE_DIR:
        {
            rc = vbsfCloseDir (pHandle);
            break;
        }
        case SHFL_HF_TYPE_FILE:
        {
            rc = vbsfCloseFile (pHandle);
            break;
        }
        default:
            AssertFailed();
            break;
    }
    vbsfFreeFileHandle(Handle);

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

    return rc;
}

int vbsfRead  (SHFLCLIENTDATA *pClient, SHFLROOT root, SHFLHANDLE Handle, uint64_t offset, uint32_t *pcbBuffer, uint8_t *pBuffer)
{
    SHFLFILEHANDLE *pHandle = (SHFLFILEHANDLE *)vbsfQueryHandle(Handle, SHFL_HF_TYPE_FILE);
    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));

    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;
}

int vbsfWrite (SHFLCLIENTDATA *pClient, SHFLROOT root, SHFLHANDLE Handle, uint64_t offset, uint32_t *pcbBuffer, uint8_t *pBuffer)
{
    SHFLFILEHANDLE *pHandle = (SHFLFILEHANDLE *)vbsfQueryHandle(Handle, SHFL_HF_TYPE_FILE);
    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?
     * XXX Actually this check was still done in vbsfCreate() -- RTFILE_O_WRITE cannot be set if vbsfMappingsQueryWritable() failed. */
    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;
}


int vbsfFlush(SHFLCLIENTDATA *pClient, SHFLROOT root, SHFLHANDLE Handle)
{
    SHFLFILEHANDLE *pHandle = (SHFLFILEHANDLE *)vbsfQueryHandle(Handle, SHFL_HF_TYPE_FILE);
    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;
}

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 = (SHFLFILEHANDLE *)vbsfQueryHandle(Handle, SHFL_HF_TYPE_DIR);
    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;
    }
    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, &pszFullPath, NULL, true);

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

                /* 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, RTPATH_F_FOLLOW_LINK);
            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
        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 (virtaul) 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;
}

int vbsfQueryFileInfo(SHFLCLIENTDATA *pClient, SHFLROOT root, SHFLHANDLE Handle, uint32_t flags, uint32_t *pcbBuffer, uint8_t *pBuffer)
{
    SHFLFILEHANDLE *pHandle = (SHFLFILEHANDLE *)vbsfQueryHandle(Handle, SHFL_HF_TYPE_DIR|SHFL_HF_TYPE_FILE);
    int            rc = VINF_SUCCESS;
    RTFSOBJINFO   *pObjInfo = (RTFSOBJINFO *)pBuffer;


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

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

    *pcbBuffer  = 0;

    if (pHandle->Header.u32Flags & SHFL_HF_TYPE_DIR)
    {
        rc = RTDirQueryInfo(pHandle->dir.Handle, pObjInfo, RTFSOBJATTRADD_NOTHING);
    }
    else
    {
        rc = RTFileQueryInfo(pHandle->file.Handle, pObjInfo, 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)
    {
        *pcbBuffer = sizeof(RTFSOBJINFO);
    }
    else
        AssertFailed();

    return rc;
}

static int vbsfSetFileInfo(SHFLCLIENTDATA *pClient, SHFLROOT root, SHFLHANDLE Handle, uint32_t flags, uint32_t *pcbBuffer, uint8_t *pBuffer)
{
    SHFLFILEHANDLE *pHandle = (SHFLFILEHANDLE *)vbsfQueryHandle(Handle, SHFL_HF_TYPE_DIR|SHFL_HF_TYPE_FILE);
    int             rc = VINF_SUCCESS;
    RTFSOBJINFO    *pSFDEntry;

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

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

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

    /* Change only the time values that are not zero */
    if (pHandle->Header.u32Flags & SHFL_HF_TYPE_DIR)
    {
        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
    {
        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 (pHandle->Header.u32Flags & SHFL_HF_TYPE_FILE)
    {
        /* 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((RTFILE)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(RTFSOBJINFO);
        }
        else
            AssertFailed();
    }

    return rc;
}


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

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

    *pcbBuffer  = 0;
    pSFDEntry   = (RTFSOBJINFO *)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
            *pSFDEntry = fileinfo;
            *pcbBuffer = sizeof(RTFSOBJINFO);
        }
        else
            AssertFailed();
    }

    return rc;
}

int vbsfQueryVolumeInfo(SHFLCLIENTDATA *pClient, SHFLROOT root, uint32_t flags, uint32_t *pcbBuffer, uint8_t *pBuffer)
{
    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));
    rc = vbsfBuildFullPath (pClient, root, &dummy, 0, &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;

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

        *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;
}

int vbsfSetFSInfo(SHFLCLIENTDATA *pClient, SHFLROOT root, SHFLHANDLE Handle, uint32_t flags, uint32_t *pcbBuffer, uint8_t *pBuffer)
{
    SHFLFILEHANDLE *pHandle = (SHFLFILEHANDLE *)vbsfQueryHandle(Handle, SHFL_HF_TYPE_DIR|SHFL_HF_TYPE_FILE|SHFL_HF_TYPE_VOLUME);

    if (pHandle == 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;
}

int vbsfLock(SHFLCLIENTDATA *pClient, SHFLROOT root, SHFLHANDLE Handle, uint64_t offset, uint64_t length, uint32_t flags)
{
    SHFLFILEHANDLE *pHandle = (SHFLFILEHANDLE *)vbsfQueryHandle(Handle, SHFL_HF_TYPE_FILE);
    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;
#endif
    return rc;
}

int vbsfUnlock(SHFLCLIENTDATA *pClient, SHFLROOT root, SHFLHANDLE Handle, uint64_t offset, uint64_t length, uint32_t flags)
{
    SHFLFILEHANDLE *pHandle = (SHFLFILEHANDLE *)vbsfQueryHandle(Handle, SHFL_HF_TYPE_FILE);
    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;
#endif

    return rc;
}


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)
        || 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_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;
}


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, &pszFullPathSrc, NULL);
    if (rc != VINF_SUCCESS)
        return rc;

    rc = vbsfBuildFullPath (pClient, root, pDest, pDest->u16Size, &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);
            }
        }

#ifndef DEBUG_dmik
        AssertRC(rc);
#endif
        /* free the path string */
        vbsfFreeFullPath(pszFullPathDest);
    }
    /* free the path string */
    vbsfFreeFullPath(pszFullPathSrc);
    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++)
    {
        SHFLFILEHANDLE *pHandle = (SHFLFILEHANDLE *)vbsfQueryHandle(i, SHFL_HF_TYPE_MASK);

        if (pHandle)
        {
            Log(("Open handle %08x\n", i));
            vbsfClose(pClient, SHFL_HANDLE_ROOT /* incorrect, but it's not important */, (SHFLHANDLE)i);
        }
    }
    return VINF_SUCCESS;
}