Experimental Physics and
Industrial Control System

"J. Lewis Muir" <[email protected]> · Thu, 29 Nov 2012 15:17:50 -0600

On 11/29/12 2:52 PM, Matej Sekoranja wrote:
>>> 2) For CA Access Security, CAJ uses full hostnames (with domain) and libca uses short host names (without domain)
>>
>> This sounds like a bug to me.  I would expect the two to behave
>> identically.  I don't know what the correct behavior is.  Maybe libca is
>> not behaving in accordance with the spec, or maybe the short hostname is
>> according to spec.  If the latter, and if Matej (the developer of CAJ)
>> does not want to change this behavior as the default, perhaps support
>> could be added for a compatibility-mode option/property to enable the
>> use of the short hostname in CAJ?
> 
> The method CAJ uses to get hostname is (or was in 2006) not
> deterministic - it can return long or short name. There is an JVM
> "-DCAJ_STRIP_HOSTNAME" option to strip SHN from possibly returned FQDN
> (e.g. alma.hq.eso.org -> alma).

Would an EPICS Base developer be willing to comment on this?  What is
the correct behavior, or is it unspecified?

The EPICS Application Developer's Guide for 3.14.12 doesn't explicitly
say (from what I can tell based on a quick skim), but the examples seem
to all use short hostnames.

The guide also says, "For vxWorks clients, the host name is usually
taken from the target name of the boot parameters."  I would bet a
number of vxWorks IOCs have their target name set to just the short
hostname.

Thanks,

Lewis

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System