Stefan4112 opened a new issue, #742:
URL: https://github.com/apache/mina-sshd/issues/742
### Version
2.12.1
### Bug description
The new WinSCP client version 6.5 sends the FileAttribute "size" when
opening a file. This leads to following Exception:
```
java.lang.UnsupportedOperationException: FS Does not support secure
directory streams.
at
org.apache.sshd.sftp.server.SftpFileSystemAccessor.secure(SftpFileSystemAccessor.java:593)
at
org.apache.sshd.sftp.server.SftpFileSystemAccessor.secureResolveDirectoryStream(SftpFileSystemAccessor.java:585)
at
org.apache.sshd.sftp.server.SftpFileSystemAccessor.seekableByteChannelNoLinkFollow(SftpFileSystemAccessor.java:565)
at
org.apache.sshd.sftp.server.SftpFileSystemAccessor.openFile(SftpFileSystemAccessor.java:217)
at
org.apache.sshd.sftp.server.AbstractSftpSubsystemHelper.setFileAttributes(AbstractSftpSubsystemHelper.java:2707)
at
org.apache.sshd.sftp.server.AbstractSftpSubsystemHelper.doSetAttributes(AbstractSftpSubsystemHelper.java:2671)
at org.apache.sshd.sftp.server.FileHandle.<init>(FileHandle.java:94)
at
org.apache.sshd.sftp.server.SftpSubsystem.doOpen(SftpSubsystem.java:968)
at
org.apache.sshd.sftp.server.AbstractSftpSubsystemHelper.doOpen(AbstractSftpSubsystemHelper.java:496)
at
org.apache.sshd.sftp.server.AbstractSftpSubsystemHelper.doProcess(AbstractSftpSubsystemHelper.java:353)
at
org.apache.sshd.sftp.server.SftpSubsystem.doProcess(SftpSubsystem.java:355)
at
org.apache.sshd.sftp.server.AbstractSftpSubsystemHelper.process(AbstractSftpSubsystemHelper.java:344)
at org.apache.sshd.sftp.server.SftpSubsystem.run(SftpSubsystem.java:331)
```
I identified the problem in org.apache.sshd.sftp.server.FileHandle.java
```
SftpFileSystemAccessor accessor = subsystem.getFileSystemAccessor();
SeekableByteChannel channel;
try {
channel = accessor.openFile(
subsystem, this, file, handle, openOptions, fileAttrs);
} catch (UnsupportedOperationException e) {
channel = accessor.openFile(
subsystem, this, file, handle, openOptions,
IoUtils.EMPTY_FILE_ATTRIBUTES);
subsystem.doSetAttributes(SftpConstants.SSH_FXP_OPEN, "", file, attrs,
false);
}
```
### Actual behavior
1. The first accessor.openFile(...) throws an exception that is not shown in
log
2. Second accessor.openFile(...) creates file, but
subsystem.doSetAttributes(...) throws Exception "FS Does not support secure
directory streams", because followLinks is hard-coded to false and not
supported on IBM i.
### Expected behavior
1. Show the exception on debug/trace log
2. Do not use followLinks=false if it can lead to problems. A fallback as it
is mentioned before the exception. Or maybe some way to configure it?
### Relevant log output
```Shell
```
### Other information
_No response_
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