[syslog-ng] valid HOSTNAME characters in syslog?

[dave]

Thanks for the historical reasons. 

I would like rephrase my question as below:
 If I were to implement a standard compliant Syslog
Relay, do I need to treat '@' a valid character in the
HOSTNAME field of syslog message to be relayed?
For e.g.:
Input syslog to Relay- <34>Jan 23 11:11:11 host at nm MSG
Output from Relay    - <34>Jan 23 11:11:11 host at nm MSG

i.e. The relay didn't insert new hostname/ipAddress
while forwarding. Is this a standard compliant Syslog
Relay behavior?



Is chaining of hostnames using '@' specific to
SyslogNg? 

cheers
+D

--- Balazs Scheidler <bazsi at balabit.hu> wrote:

> 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.



       
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