sftpdcmd.txt

伯克利做的SFTP安全文件传输协议

SafeTP Daemon FTP Command Handling Summary

USER

If this is the first command, 959 interoperability mode is used.

If this is sent in an ENC command after authentication, it is
relayed to ftpd, and ftpd's reply is relayed to the client.

Otherwise, an error is returned to the client.


REIN

Always returns an error.


PORT

We assume that a client always sends PORT before a data-channel
request.  "Default" ports, as specified in 959, are not supported.