Hi,
On Mon, Aug 05, 2019 at 05:21:33PM -0400, Richard L. Hamilton wrote:
Seems to me that underscore is mainly a problem with address 0.0.0.0 in hosts.cfg (name to IP address resolution via host naming services, esp. if that ends up being DNS). If an IP address in hosts.cfg is used, and the hostname there isn't used in some other way, I don't guess it would matter.
Hmmm, indeed https://en.wikipedia.org/wiki/Domain_Name_System#Domain_name_syntax,_interna... as well as RFC 608, 810 and 952 say that no other characters than letters, digits and hyphens are allowed.
I'm though quite sure to already have seen hostnames with underscore and even a slash in the wild. The latter was though about 20 years ago or so where I saw router names of a university with a slash in their hostname.
Traces of hostnames with slashes can also be found on the web, e.g. https://serverfault.com/questions/963735/syslog-ng-hostnames-with-slashes
And underscore is explicitly mentioned in https://en.wikipedia.org/wiki/Hostname#Restrictions_on_valid_hostnames
So IMHO while not being standard-compliant hostnames, Xymon should accept at least hostnames with underscore, too.
On the other hand, I don't think, it's necessary to also add the slash to the list of valid characters for hostnames as the dot is already in there, too, and hostnames which are allowed to contain "/../" are definitely no good. :-)
Kind regards, Axel-- PGP: 2FF9CD59612616B5 /~\ Plain Text Ribbon Campaign, http://arc.pasp.de/ Mail: abe at deuxchevaux.org \ / Say No to HTML in E-Mail and Usenet Mail+Jabber: abe at noone.org X https://axel.beckert.ch/ / \ I love long mails: https://email.is-not-s.ms/