nFileSizeHigh: self.data.nFileSizeHigh,
nFileSizeLow: self.data.nFileSizeLow,
},
- reparse_tag: self.data.dwReserved0,
+ reparse_tag: if self.data.dwFileAttributes & c::FILE_ATTRIBUTE_REPARSE_POINT != 0 {
+ // reserved unless this is a reparse point
+ self.data.dwReserved0
+ } else {
+ 0
+ },
})
}
}
}
impl File {
- fn open_reparse_point(path: &Path, write: bool) -> io::Result<File> {
- let mut opts = OpenOptions::new();
- opts.read(!write);
- opts.write(write);
- opts.custom_flags(c::FILE_FLAG_OPEN_REPARSE_POINT |
- c::FILE_FLAG_BACKUP_SEMANTICS);
- File::open(path, &opts)
- }
-
pub fn open(path: &Path, opts: &OpenOptions) -> io::Result<File> {
let path = try!(to_u16s(path));
let handle = unsafe {
fn readlink(&self) -> io::Result<PathBuf> {
let mut space = [0u8; c::MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
let (_bytes, buf) = try!(self.reparse_point(&mut space));
- if buf.ReparseTag != c::IO_REPARSE_TAG_SYMLINK {
- return Err(io::Error::new(io::ErrorKind::Other, "not a symlink"))
- }
-
unsafe {
- let info: *const c::SYMBOLIC_LINK_REPARSE_BUFFER =
- &buf.rest as *const _ as *const _;
- let path_buffer = &(*info).PathBuffer as *const _ as *const u16;
- let subst_off = (*info).SubstituteNameOffset / 2;
+ let (path_buffer, subst_off, subst_len, relative) = match buf.ReparseTag {
+ c::IO_REPARSE_TAG_SYMLINK => {
+ let info: *const c::SYMBOLIC_LINK_REPARSE_BUFFER =
+ &buf.rest as *const _ as *const _;
+ (&(*info).PathBuffer as *const _ as *const u16,
+ (*info).SubstituteNameOffset / 2,
+ (*info).SubstituteNameLength / 2,
+ (*info).Flags & c::SYMLINK_FLAG_RELATIVE != 0)
+ },
+ c::IO_REPARSE_TAG_MOUNT_POINT => {
+ let info: *const c::MOUNT_POINT_REPARSE_BUFFER =
+ &buf.rest as *const _ as *const _;
+ (&(*info).PathBuffer as *const _ as *const u16,
+ (*info).SubstituteNameOffset / 2,
+ (*info).SubstituteNameLength / 2,
+ false)
+ },
+ _ => return Err(io::Error::new(io::ErrorKind::Other,
+ "Unsupported reparse point type"))
+ };
let subst_ptr = path_buffer.offset(subst_off as isize);
- let subst_len = (*info).SubstituteNameLength / 2;
- let subst = slice::from_raw_parts(subst_ptr, subst_len as usize);
-
+ let mut subst = slice::from_raw_parts(subst_ptr, subst_len as usize);
+ // Absolute paths start with an NT internal namespace prefix `\??\`
+ // We should not let it leak through.
+ if !relative && subst.starts_with(&[92u16, 63u16, 63u16, 92u16]) {
+ subst = &subst[4..];
+ }
Ok(PathBuf::from(OsString::from_wide(subst)))
}
}
rmdir(path)
}
-pub fn readlink(p: &Path) -> io::Result<PathBuf> {
- let file = try!(File::open_reparse_point(p, false));
+pub fn readlink(path: &Path) -> io::Result<PathBuf> {
+ // Open the link with no access mode, instead of generic read.
+ // By default FILE_LIST_DIRECTORY is denied for the junction "C:\Documents and Settings", so
+ // this is needed for a common case.
+ let mut opts = OpenOptions::new();
+ opts.access_mode(0);
+ opts.custom_flags(c::FILE_FLAG_OPEN_REPARSE_POINT |
+ c::FILE_FLAG_BACKUP_SEMANTICS);
+ let file = try!(File::open(&path, &opts));
file.readlink()
}
Ok(())
}
-pub fn stat(p: &Path) -> io::Result<FileAttr> {
- let attr = try!(lstat(p));
-
- // If this is a reparse point, then we need to reopen the file to get the
- // actual destination. We also pass the FILE_FLAG_BACKUP_SEMANTICS flag to
- // ensure that we can open directories (this path may be a directory
- // junction). Once the file is opened we ask the opened handle what its
- // metadata information is.
- if attr.is_reparse_point() {
- let mut opts = OpenOptions::new();
- // No read or write permissions are necessary
- opts.access_mode(0);
- // This flag is so we can open directories too
- opts.custom_flags(c::FILE_FLAG_BACKUP_SEMANTICS);
- let file = try!(File::open(p, &opts));
- file.file_attr()
- } else {
- Ok(attr)
- }
+pub fn stat(path: &Path) -> io::Result<FileAttr> {
+ let mut opts = OpenOptions::new();
+ // No read or write permissions are necessary
+ opts.access_mode(0);
+ // This flag is so we can open directories too
+ opts.custom_flags(c::FILE_FLAG_BACKUP_SEMANTICS);
+ let file = try!(File::open(path, &opts));
+ file.file_attr()
}
-pub fn lstat(p: &Path) -> io::Result<FileAttr> {
- let u16s = try!(to_u16s(p));
- unsafe {
- let mut attr: FileAttr = mem::zeroed();
- try!(cvt(c::GetFileAttributesExW(u16s.as_ptr(),
- c::GetFileExInfoStandard,
- &mut attr.data as *mut _ as *mut _)));
- if attr.is_reparse_point() {
- attr.reparse_tag = File::open_reparse_point(p, false).and_then(|f| {
- let mut b = [0; c::MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
- f.reparse_point(&mut b).map(|(_, b)| b.ReparseTag)
- }).unwrap_or(0);
- }
- Ok(attr)
- }
+pub fn lstat(path: &Path) -> io::Result<FileAttr> {
+ let mut opts = OpenOptions::new();
+ // No read or write permissions are necessary
+ opts.access_mode(0);
+ opts.custom_flags(c::FILE_FLAG_BACKUP_SEMANTICS | c::FILE_FLAG_OPEN_REPARSE_POINT);
+ let file = try!(File::open(path, &opts));
+ file.file_attr()
}
pub fn set_perm(p: &Path, perm: FilePermissions) -> io::Result<()> {
fn symlink_junction_inner(target: &Path, junction: &Path) -> io::Result<()> {
let d = DirBuilder::new();
try!(d.mkdir(&junction));
- let f = try!(File::open_reparse_point(junction, true));
+
+ let mut opts = OpenOptions::new();
+ opts.write(true);
+ opts.custom_flags(c::FILE_FLAG_OPEN_REPARSE_POINT |
+ c::FILE_FLAG_BACKUP_SEMANTICS);
+ let f = try!(File::open(junction, &opts));
let h = f.handle().raw();
unsafe {
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