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Add support for Windows network paths to the UNC support in _bfd_real_open().

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PR 31527
This commit is contained in:
Zhiqing Xiong 2024-04-05 09:41:40 +01:00 committed by Nick Clifton
parent 54e2d897a6
commit eac88f3298
1 changed files with 72 additions and 36 deletions
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108
bfd/bfdio.c
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@ -29,6 +29,8 @@
#if defined (_WIN32)
#include <windows.h>
#include <locale.h>
/* FIXME: Do we need a configure time test for the presence of this headers ? */
#include <shlwapi.h> /* Needed for PathIsNetworkPathA(). */
#endif
#ifndef S_IXUSR
@ -118,61 +120,95 @@ _bfd_real_fopen (const char *filename, const char *modes)
#elif defined (_WIN32)
/* PR 25713: Handle extra long path names possibly containing '..' and '.'. */
wchar_t ** lpFilePart = {NULL};
const wchar_t prefix[] = L"\\\\?\\";
const size_t partPathLen = strlen (filename) + 1;
wchar_t ** lpFilePart = {NULL};
const wchar_t prefixDOS[] = L"\\\\?\\";
const wchar_t prefixUNC[] = L"\\\\?\\UNC\\";
const size_t partPathLen = strlen (filename) + 1;
const wchar_t * prefix;
size_t sizeof_prefix;
/* PR 31527: Paths that begin with two backslash characters
(\\) are interpreted as Universal Naming Convention (UNC)
paths. They use the "\\?\UNC\" prefix for network UNC paths
and the "\\?\" prefix for dos UNC paths. For more information
see: https://learn.microsoft.com/en-us/windows/win32/fileio/maximum-file-path-limitation?tabs=registry
*/
bool is_network_path = PathIsNetworkPathA (filename);
if (is_network_path)
{
prefix = prefixUNC;
sizeof_prefix = sizeof (prefixUNC);
}
else
{
prefix = prefixDOS;
sizeof_prefix = sizeof (prefixDOS);
}
#ifdef __MINGW32__
#if !HAVE_DECL____LC_CODEPAGE_FUNC
/* This prototype was added to locale.h in version 9.0 of MinGW-w64. */
_CRTIMP unsigned int __cdecl ___lc_codepage_func (void);
/* This prototype was added to locale.h in version 9.0 of MinGW-w64. */
_CRTIMP unsigned int __cdecl ___lc_codepage_func (void);
#endif
const unsigned int cp = ___lc_codepage_func ();
const unsigned int cp = ___lc_codepage_func ();
#else
const unsigned int cp = CP_UTF8;
const unsigned int cp = CP_UTF8;
#endif
/* Converting the partial path from ascii to unicode.
1) Get the length: Calling with lpWideCharStr set to null returns the length.
2) Convert the string: Calling with cbMultiByte set to -1 includes the terminating null. */
size_t partPathWSize = MultiByteToWideChar (cp, 0, filename, -1, NULL, 0);
wchar_t * partPath = calloc (partPathWSize, sizeof(wchar_t));
size_t ix;
/* Converting the partial path from ascii to unicode.
1) Get the length: Calling with lpWideCharStr set to null returns the length.
2) Convert the string: Calling with cbMultiByte set to -1 includes the terminating null. */
size_t partPathWSize = MultiByteToWideChar (cp, 0, filename, -1, NULL, 0);
wchar_t * partPath = calloc (partPathWSize, sizeof(wchar_t));
size_t ix;
MultiByteToWideChar (cp, 0, filename, -1, partPath, partPathWSize);
MultiByteToWideChar (cp, 0, filename, -1, partPath, partPathWSize);
/* Convert any UNIX style path separators into the DOS i.e. backslash separator. */
for (ix = 0; ix < partPathLen; ix++)
if (IS_UNIX_DIR_SEPARATOR(filename[ix]))
partPath[ix] = '\\';
/* Convert any UNIX style path separators into the DOS i.e. backslash separator. */
for (ix = 0; ix < partPathLen; ix++)
if (IS_UNIX_DIR_SEPARATOR(filename[ix]))
partPath[ix] = '\\';
/* Getting the full path from the provided partial path.
1) Get the length.
2) Resolve the path. */
long fullPathWSize = GetFullPathNameW (partPath, 0, NULL, lpFilePart);
wchar_t * fullPath = calloc (fullPathWSize + sizeof(prefix) + 1, sizeof(wchar_t));
/* Getting the full path from the provided partial path.
1) Get the length.
2) Resolve the path. */
long fullPathWSize = GetFullPathNameW (partPath, 0, NULL, lpFilePart);
wchar_t * fullPath = calloc (fullPathWSize + sizeof_prefix + 1, sizeof(wchar_t));
wcscpy (fullPath, prefix);
wcscpy (fullPath, prefix);
int prefixLen = sizeof(prefix) / sizeof(wchar_t);
int prefixLen = sizeof_prefix / sizeof(wchar_t);
/* Do not add a prefix to the null device. */
if (stricmp (filename, "nul") == 0)
/* Do not add a prefix to the null device. */
if (stricmp (filename, "nul") == 0)
prefixLen = 1;
wchar_t * fullPathOffset = fullPath + prefixLen - 1;
wchar_t * fullPathOffset = fullPath + prefixLen - 1;
GetFullPathNameW (partPath, fullPathWSize, fullPathOffset, lpFilePart);
free (partPath);
GetFullPathNameW (partPath, fullPathWSize, fullPathOffset, lpFilePart);
/* It is non-standard for modes to exceed 16 characters. */
wchar_t modesW[16];
if (is_network_path)
{
/* Remove begining of the beginning two backslash characters (\\). */
wchar_t *_fullPath = calloc (fullPathWSize + sizeof_prefix + 1, sizeof(wchar_t));
MultiByteToWideChar (cp, 0, modes, -1, modesW, sizeof(modesW));
GetFullPathNameW (fullPath, fullPathWSize + sizeof_prefix + 1, _fullPath, lpFilePart);
free (fullPath);
fullPath = _fullPath;
}
FILE * file = _wfopen (fullPath, modesW);
free (fullPath);
free (partPath);
return close_on_exec (file);
/* It is non-standard for modes to exceed 16 characters. */
wchar_t modesW[16];
MultiByteToWideChar (cp, 0, modes, -1, modesW, sizeof(modesW));
FILE * file = _wfopen (fullPath, modesW);
free (fullPath);
return close_on_exec (file);
#elif defined (HAVE_FOPEN64)
return close_on_exec (fopen64 (filename, modes));