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* path.cc (symlink_info::check_reparse_point): Use NtFsControlFile 

to read reparse points.
	(enum shortcut_t): New type.
	(symlink_info::check): Convert sym_check to shortcut_t.  Use shortcut_t
	enum values throughout.  Check reparse point before checking for
	sysfile shortcut.  Open reparse points with READ_CONTROL only to
	accommodate special Vista reparse points.  Add comments.
This commit is contained in:
Corinna Vinschen 2008-04-02 11:35:10 +00:00
parent 5cb524ee7d
commit 3d0192def9
2 changed files with 60 additions and 27 deletions
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10
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,13 @@
2008-04-02 Corinna Vinschen <corinna@vinschen.de>
* path.cc (symlink_info::check_reparse_point): Use NtFsControlFile
to read reparse points.
(enum shortcut_t): New type.
(symlink_info::check): Convert sym_check to shortcut_t. Use shortcut_t
enum values throughout. Check reparse point before checking for
sysfile shortcut. Open reparse points with READ_CONTROL only to
accommodate special Vista reparse points. Add comments.
2008-04-02 Corinna Vinschen <corinna@vinschen.de>
* flock.cc (get_lock_parent_dir): Drop call to NtOpenDirectoryObject

77
winsup/cygwin/path.cc
View File

@ -3487,15 +3487,19 @@ symlink_info::check_sysfile (HANDLE h)
int
symlink_info::check_reparse_point (HANDLE h)
{
NTSTATUS status;
IO_STATUS_BLOCK io;
PREPARSE_DATA_BUFFER rp = (PREPARSE_DATA_BUFFER)
alloca (MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
DWORD size;
char srcbuf[SYMLINK_MAX + 7];
if (!DeviceIoControl (h, FSCTL_GET_REPARSE_POINT, NULL, 0, (LPVOID) rp,
MAXIMUM_REPARSE_DATA_BUFFER_SIZE, &size, NULL))
status = NtFsControlFile (h, NULL, NULL, NULL, &io, FSCTL_GET_REPARSE_POINT,
NULL, 0, (LPVOID) rp,
MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
if (!NT_SUCCESS (status))
{
debug_printf ("DeviceIoControl(FSCTL_GET_REPARSE_POINT) failed, %E");
debug_printf ("NtFsControlFile(FSCTL_GET_REPARSE_POINT) failed, %p",
status);
set_error (EIO);
return 0;
}
@ -3774,6 +3778,13 @@ symlink_info::parse_device (const char *contents)
Return -1 on error, 0 if PATH is not a symlink, or the length
stored into BUF if PATH is a symlink. */
enum shortcut_t {
is_no_symlink,
is_shortcut_symlink,
is_reparse_symlink,
is_sysfile_symlink
};
int
symlink_info::check (char *path, const suffix_info *suffixes, unsigned opt)
{
@ -3896,9 +3907,9 @@ symlink_info::check (char *path, const suffix_info *suffixes, unsigned opt)
|| (opt & PC_SYM_IGNORE))
goto file_not_symlink;
int sym_check;
shortcut_t sym_check;
sym_check = 0;
sym_check = is_no_symlink;
if ((fileattr & (FILE_ATTRIBUTE_DIRECTORY | FILE_ATTRIBUTE_REPARSE_POINT))
== FILE_ATTRIBUTE_DIRECTORY)
@ -3907,35 +3918,45 @@ symlink_info::check (char *path, const suffix_info *suffixes, unsigned opt)
/* Windows shortcuts are potentially treated as symlinks. */
/* Valid Cygwin & U/WIN shortcuts are R/O. */
if ((fileattr & FILE_ATTRIBUTE_READONLY) && suffix.lnk_match ())
sym_check = 1;
sym_check = is_shortcut_symlink;
/* Reparse points are potentially symlinks. This check must be
performed before checking the SYSTEM attribute for sysfile
symlinks, since reparse points can have this flag set, too.
For instance, Vista starts to create a couple of reparse points
with SYSTEM and HIDDEN flags set. */
else if (fileattr & FILE_ATTRIBUTE_REPARSE_POINT)
sym_check = is_reparse_symlink;
/* 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). */
else if (fileattr & FILE_ATTRIBUTE_SYSTEM)
sym_check = 2;
sym_check = is_sysfile_symlink;
/* Reparse points are potentially symlinks. */
else if (fileattr & FILE_ATTRIBUTE_REPARSE_POINT)
sym_check = 3;
if (!sym_check)
if (sym_check == is_no_symlink)
goto file_not_symlink;
res = -1;
/* Open the file. */
status = NtOpenFile (&h, FILE_GENERIC_READ, &attr, &io,
FILE_SHARE_VALID_FLAGS,
FILE_SYNCHRONOUS_IO_NONALERT
| FILE_OPEN_FOR_BACKUP_INTENT
| (sym_check == 3 ? FILE_OPEN_REPARSE_POINT : 0));
/* Open the file. Opening reparse points must not use GENERIC_READ.
The reason is that Vista starts to create a couple of reparse
points for backward compatibility, hidden system files, explicitely
denying everyone FILE_READ_DATA access. */
status = NtOpenFile (&h,
sym_check == is_reparse_symlink
? READ_CONTROL : FILE_GENERIC_READ,
&attr, &io, FILE_SHARE_VALID_FLAGS,
FILE_OPEN_FOR_BACKUP_INTENT
| (sym_check == is_reparse_symlink
? FILE_OPEN_REPARSE_POINT
: FILE_SYNCHRONOUS_IO_NONALERT));
if (!NT_SUCCESS (status))
goto file_not_symlink;
switch (sym_check)
{
case 1:
case is_shortcut_symlink:
res = check_shortcut (h);
NtClose (h);
if (!res)
@ -3951,18 +3972,20 @@ symlink_info::check (char *path, const suffix_info *suffixes, unsigned opt)
fileattr = INVALID_FILE_ATTRIBUTES;
continue; /* in case we're going to tack *another* .lnk on this filename. */
case 2:
res = check_sysfile (h);
NtClose (h);
if (!res)
goto file_not_symlink;
break;
case 3:
case is_reparse_symlink:
res = check_reparse_point (h);
NtClose (h);
if (!res)
goto file_not_symlink;
break;
case is_sysfile_symlink:
res = check_sysfile (h);
NtClose (h);
if (!res)
goto file_not_symlink;
break;
default: /* Make gcc happy. Won't happen. */
goto file_not_symlink;
}
break;