It is possible. However, the client exit does not get control before the PARM= values have been processed into an IP address.
Never underestimate the power of an annoyed developer. There is a way to get to FTP's PARM= value. Sent from iPhone - small keyboard fat fingers - expect spellinf errots. > On Aug 13, 2015, at 3:56 PM, Peter Hunkeler <[email protected]> wrote: > > >> I've been asked to find a way to check FTP usage in our z/OS >> environment (2.1 at this point) to see if users are specifying IP >> addresses or names to be resolved. > > > > > IP packets contain IP addresses and ports, not DNS names. The receiver cannot > tell whether the user behind the client specified a hostname (to be resolved > by a DNS lookup) or an IP address directly. If the former, then the client > software must resolve the hostname via DNS lookup in order to start a TCP > session via IP address. > > > With HTTP, the client sends how the server was addressed to the server. So > the web server knows whether the user entered an IP address or a hostname. > This is the basis for multihoming, aka. VirtualHosts in web servers. > > > I don't know but doubt that this information is part of the FTP protocol. If > not, what you desire seems not possible to me. > > > -- > Peter Hunkeler > > > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
