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/* $Id: vbsfpathabs.cpp $ */
/** @file
* Shared Folders Service - guest/host path convertion and verification.
*/
/*
* Copyright (C) 2017-2019 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.
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#define LOG_GROUP LOG_GROUP_SHARED_FOLDERS
#include <iprt/err.h>
#include <iprt/path.h>
#include <iprt/string.h>
#if defined(RT_OS_WINDOWS)
static void vbsfPathResolveRelative(char *pszPathBegin)
{
char *pszCur = pszPathBegin;
char * const pszTop = pszCur;
/*
* Get rid of double dot path components by evaluating them.
*/
for (;;)
{
char const chFirst = pszCur[0];
if ( chFirst == '.'
&& pszCur[1] == '.'
&& (!pszCur[2] || pszCur[2] == RTPATH_SLASH))
{
/* rewind to the previous component if any */
char *pszPrev = pszCur;
if ((uintptr_t)pszPrev > (uintptr_t)pszTop)
{
pszPrev--;
while ( (uintptr_t)pszPrev > (uintptr_t)pszTop
&& pszPrev[-1] != RTPATH_SLASH)
pszPrev--;
}
if (!pszCur[2])
{
if (pszPrev != pszTop)
pszPrev[-1] = '\0';
else
*pszPrev = '\0';
break;
}
Assert(pszPrev[-1] == RTPATH_SLASH);
memmove(pszPrev, pszCur + 3, strlen(pszCur + 3) + 1);
pszCur = pszPrev - 1;
}
else if ( chFirst == '.'
&& (!pszCur[1] || pszCur[1] == RTPATH_SLASH))
{
/* remove unnecessary '.' */
if (!pszCur[1])
{
if (pszCur != pszTop)
pszCur[-1] = '\0';
else
*pszCur = '\0';
break;
}
memmove(pszCur, pszCur + 2, strlen(pszCur + 2) + 1);
continue;
}
else
{
/* advance to end of component. */
while (*pszCur && *pszCur != RTPATH_SLASH)
pszCur++;
}
if (!*pszCur)
break;
/* skip the slash */
++pszCur;
}
}
#endif /* RT_OS_WINDOWS */
int vbsfPathAbs(const char *pszRoot, const char *pszPath, char *pszAbsPath, size_t cbAbsPath)
{
#if defined(RT_OS_WINDOWS)
const char *pszPathStart = pszRoot? pszRoot: pszPath;
/* Windows extended-length paths. */
if ( RTPATH_IS_SLASH(pszPathStart[0])
&& RTPATH_IS_SLASH(pszPathStart[1])
&& pszPathStart[2] == '?'
&& RTPATH_IS_SLASH(pszPathStart[3])
)
{
/* Maximum total path length of 32,767 characters. */
if (cbAbsPath > _32K)
cbAbsPath = _32K;
/* Copy the root to pszAbsPath buffer. */
size_t cchRoot = pszRoot? strlen(pszRoot): 0;
if (cchRoot >= cbAbsPath)
return VERR_FILENAME_TOO_LONG;
if (pszRoot)
{
/* Caller must ensure that the path is relative, without the leading path separator. */
if (RTPATH_IS_SLASH(pszPath[0]))
return VERR_INVALID_PARAMETER;
if (cchRoot)
memcpy(pszAbsPath, pszRoot, cchRoot);
if (cchRoot == 0 || !RTPATH_IS_SLASH(pszAbsPath[cchRoot - 1]))
{
/* Append path separator after the root. */
++cchRoot;
if (cchRoot >= cbAbsPath)
return VERR_FILENAME_TOO_LONG;
pszAbsPath[cchRoot - 1] = RTPATH_SLASH;
}
}
/* Append the path to the pszAbsPath buffer. */
const size_t cchPath = strlen(pszPath);
if (cchRoot + cchPath >= cbAbsPath)
return VERR_FILENAME_TOO_LONG;
memcpy(&pszAbsPath[cchRoot], pszPath, cchPath + 1); /* Including trailing 0. */
/* Find out where the actual path begins, i.e. skip the root spec. */
char *pszPathBegin = &pszAbsPath[4]; /* Skip the extended-length path prefix "\\?\" */
if ( pszPathBegin[0]
&& RTPATH_IS_VOLSEP(pszPathBegin[1])
&& pszPathBegin[2] == RTPATH_SLASH)
{
/* "\\?\C:\" */
pszPathBegin += 3;
}
else if ( pszPathBegin[0] == 'U'
&& pszPathBegin[1] == 'N'
&& pszPathBegin[2] == 'C'
&& pszPathBegin[3] == RTPATH_SLASH)
{
/* "\\?\UNC\server\share" */
pszPathBegin += 4;
/* Skip "server\share" too. */
while (*pszPathBegin != RTPATH_SLASH && *pszPathBegin)
++pszPathBegin;
if (*pszPathBegin == RTPATH_SLASH)
{
++pszPathBegin;
while (*pszPathBegin != RTPATH_SLASH && *pszPathBegin)
++pszPathBegin;
if (*pszPathBegin == RTPATH_SLASH)
++pszPathBegin;
}
}
else
return VERR_INVALID_NAME;
/* Process pszAbsPath in place. */
vbsfPathResolveRelative(pszPathBegin);
return VINF_SUCCESS;
}
#endif /* RT_OS_WINDOWS */
/* Fallback for the common paths. */
return RTPathAbsEx(pszRoot, pszPath, pszAbsPath, cbAbsPath);
}
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