search for: ssh_filexfer_attr_extend

...------------------------------ CC| |tj at castaglia.org --- Comment #6 from TJ Saunders <tj at castaglia.org> --- Instead of using custom SFTP extensions for xattr functionality, another approach you might consider, protocol-wise, is the use of the SSH_FILEXFER_ATTR_EXTENDED flag of the ATTRS structure, which is part of SFTP protocol version 3 (and earlier); see: https://tools.ietf.org/html/draft-ietf-secsh-filexfer-02#section-5 SFTP clients can send xattrs as ATTR_EXTENDED key/value pairs in SETSTAT/FSETSTAT requests; OpenSSH should send the xattrs in READDIR an...

...some cases, even incompatible) with the openssh sftp implementation, so I'll take the current code as the main reference and just use https://www.openssh.com/txt/draft-ietf-secsh-filexfer-02.txt as documentation. After a careful look at the protocol, it seems it could be done by making use of SSH_FILEXFER_ATTR_EXTENDED attribute. Adding a pair or keys ("atime-ns" and "mtime-ns" for example) and since the value string seems to allow holding binary data, it could contain the u32 values directly in order to keep overhead as low as possible . Or even better both values could be transmitted in a...