[HECnet] 'rexec' or 'ssh <command>' over DECNET

[Paul_Koning at Dell.com]

On Aug 15, 2012, at 5:05 AM, Johnny Billquist wrote:

On 2012-08-15 10:57, Sampsa Laine wrote:
Yes, I was aware of the batch submission, but wanted to do it the "ssh way" for a particular reason..

Ok. Note, however, that the solution you came up with now is not really generally usable in DECnet, but is rather VMS-specific. But on the other hand, more or less any solution will be rather specific...

The details are, but the general mechanism is common.   See the Session Control layer specification. Basically, server application addresses come in two forms (three, maybe, but the third doesn't really make sense) -- a name, or a number.   For example, FAL is number 17.

That part is standardized, and the object numbers are registered (though no names are).   What isn't standard is how those session control requests are mapped to operating system objects or actions.

For example, in RSTS (DECnet/E), incoming connections can go to already running programs that have registered the object name and/or number.   If there isn't one, the request is looked up in a database set by NCP which defines the mapping from name or number to a program.   Unlike VMS, there is no default rule that a name maps to that same string as an executable file.   But what Sampsa did could be done to a RSTS node so long as there is a session control database entry that maps that task name to the script file as the thing to execute.

	paul