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* fhandler_disk_file.cc (fhandler_base::fstat_by_handle): Drop

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directory attribute for reparse points to avoid mistreating.
	(fhandler_base::fstat_by_name): Ditto.
	* path.cc (symlink_info::check_reparse_point): New method testing
	reparse points for symbolic links.
	(symlink_info::check_shortcut): Move file attribute tesat to calling
	function.
	(symlink_info::check): Add handling for reparse points.
	* path.h (enum path_types): Add PATH_REP to denote reparse point based
	symlinks.
	(path_conv::is_rep_symlink): New method.
	* syscalls.cc (unlink): Handle reparse points.
This commit is contained in:
Corinna Vinschen
2006-10-31 11:40:47 +00:00
parent 3ddf69712b
commit 9740f34d11
5 changed files with 112 additions and 14 deletions
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87
winsup/cygwin/path.cc
View File

@@ -104,6 +104,7 @@ struct symlink_info
bool case_check (char *path);
int check_sysfile (const char *path, HANDLE h);
int check_shortcut (const char *path, HANDLE h);
int check_reparse_point (const char *path, HANDLE h);
bool set_error (int);
};
@@ -2996,10 +2997,6 @@ symlink_info::check_shortcut (const char *path, HANDLE h)
int res = 0;
DWORD size, got = 0;
/* Valid Cygwin & U/WIN shortcuts are R/O. */
if (!(fileattr & FILE_ATTRIBUTE_READONLY))
goto file_not_symlink;
if ((size = GetFileSize (h, NULL)) > 8192) /* Not a Cygwin symlink. */
goto file_not_symlink;
buf = (char *) alloca (size);
@@ -3033,7 +3030,6 @@ close_it:
return res;
}
int
symlink_info::check_sysfile (const char *path, HANDLE h)
{
@@ -3093,6 +3089,61 @@ symlink_info::check_sysfile (const char *path, HANDLE h)
return res;
}
int
symlink_info::check_reparse_point (const char *path, HANDLE h)
{
int res = 0;
PREPARSE_DATA_BUFFER rp = (PREPARSE_DATA_BUFFER)
alloca (MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
DWORD size;
if (!DeviceIoControl (h, FSCTL_GET_REPARSE_POINT, NULL, 0, (LPVOID) rp,
MAXIMUM_REPARSE_DATA_BUFFER_SIZE, &size, NULL))
{
debug_printf ("DeviceIoControl(FSCTL_GET_REPARSE_POINT) failed, %E");
set_error (EIO);
goto close_it;
}
if (rp->ReparseTag == IO_REPARSE_TAG_SYMLINK)
{
if (rp->SymbolicLinkReparseBuffer.PrintNameLength > 2 * CYG_MAX_PATH)
{
debug_printf ("Symlink name too long");
set_error (EIO);
goto close_it;
}
res = sys_wcstombs (contents, CYG_MAX_PATH,
(WCHAR *)((char *)rp->SymbolicLinkReparseBuffer.PathBuffer
+ rp->SymbolicLinkReparseBuffer.PrintNameOffset),
rp->SymbolicLinkReparseBuffer.PrintNameLength / 2);
pflags = PATH_SYMLINK | PATH_REP;
fileattr &= ~FILE_ATTRIBUTE_DIRECTORY;
}
else if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT)
{
if (rp->SymbolicLinkReparseBuffer.PrintNameLength == 0)
{
/* Likely a volume mount point. Not treated as symlink. */
goto close_it;
}
if (rp->MountPointReparseBuffer.PrintNameLength > 2 * CYG_MAX_PATH)
{
debug_printf ("Symlink name too long");
set_error (EIO);
goto close_it;
}
res = sys_wcstombs (contents, CYG_MAX_PATH,
(WCHAR *)((char *)rp->MountPointReparseBuffer.PathBuffer
+ rp->MountPointReparseBuffer.PrintNameOffset),
rp->MountPointReparseBuffer.PrintNameLength / 2);
pflags = PATH_SYMLINK | PATH_REP;
fileattr &= ~FILE_ATTRIBUTE_DIRECTORY;
}
close_it:
CloseHandle (h);
return res;
}
enum
{
SCAN_BEG,
@@ -3337,26 +3388,35 @@ symlink_info::check (char *path, const suffix_info *suffixes, unsigned opt)
sym_check = 0;
if (fileattr & FILE_ATTRIBUTE_DIRECTORY)
if ((fileattr & (FILE_ATTRIBUTE_DIRECTORY | FILE_ATTRIBUTE_REPARSE_POINT))
== FILE_ATTRIBUTE_DIRECTORY)
goto file_not_symlink;
/* Windows shortcuts are treated as symlinks. */
if (suffix.lnk_match ())
sym_check = 1;
/* Reparse points are potentially symlinks. */
if (fileattr & FILE_ATTRIBUTE_REPARSE_POINT)
sym_check = 3;
/* This is the old Cygwin method creating symlinks: */
/* A symlink will have the `system' file attribute. */
/* Only files can be symlinks (which can be symlinks to directories). */
if (fileattr & FILE_ATTRIBUTE_SYSTEM)
else if (fileattr & FILE_ATTRIBUTE_SYSTEM)
sym_check = 2;
/* Windows shortcuts are potentially treated as symlinks. */
/* Valid Cygwin & U/WIN shortcuts are R/O. */
else if ((fileattr & FILE_ATTRIBUTE_READONLY) && suffix.lnk_match ())
sym_check = 1;
if (!sym_check)
goto file_not_symlink;
/* Open the file. */
h = CreateFile (suffix.path, GENERIC_READ, FILE_SHARE_READ,
&sec_none_nih, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
&sec_none_nih, OPEN_EXISTING,
sym_check == 3 ? FILE_FLAG_OPEN_REPARSE_POINT
| FILE_FLAG_BACKUP_SEMANTICS
: FILE_ATTRIBUTE_NORMAL, 0);
res = -1;
if (h == INVALID_HANDLE_VALUE)
goto file_not_symlink;
@@ -3383,6 +3443,11 @@ symlink_info::check (char *path, const suffix_info *suffixes, unsigned opt)
if (!res)
goto file_not_symlink;
break;
case 3:
res = check_reparse_point (suffix.path, h);
if (!res)
goto file_not_symlink;
break;
}
break;