[syslog-ng] valid HOSTNAME characters in syslog?

[Balazs Scheidler]

On Fri, 2007-08-10 at 12:53 +0200, Balazs Scheidler wrote:
> On Thu, 2007-08-09 at 16:17 -0700, dave wrote:
> > Well, I am just a user of syslog-ng. When I was using
> > it as a Relay, it was treating '@' a valid character
> > in HOSTNAME field of syslog message. I have no issues
> > with that! I just want to know which RFC states '@' a
> > valid HOSTNAME character. RFC 3164 doesn't state but
> > refers to one more RFC. I couldn't find the right info
> > there.
> > 
> > In summary, all I need to know is the Reference to RFC
> > which states '@' can be valid hostname character. If
> > possible, I would also like to see reference for valid
> > character Set for HOSTNAME in syslog message.
> 
> syslog-ng predates RFC3164, and I don't know about any RFC that states
> '@' should be ok in hostnames. AFAIK hostnames can only contain
> [\-a-zA-Z0-9]
> 
> syslog-ng only checks hostnames if check_hostnames() is enabled,
> otherwise everything till the first space is assumed to be a hostname.
> 
> The '@' character is accepted even by check_hostnames() because of
> chain_hostnames(), exactly as Sandor explained.

BTW: there's a new knowledge base article on our webpage related to this
issue, here:

http://www.balabit.com/support/knowledge_base/articles/KB1068.bbq

-- 
Bazsi