syslogd truncating messages on FreeBSD >11.2-R

[Scott]

Thanks all.

Scott

On Wed, Nov 13, 2019 at 05:11:51PM +1100, Kubilay Kocak wrote:
> On 9/11/2019 2:08 pm, Scott wrote:
> > Hi,
> > 
> > please let me know if there is a better forum for this.
> > 
> > As of 11.3-RELEASE syslogd truncates all forwarded messages to 480 bytes for
> > IPV4 and 1180 for IPv6.
> > 
> > The change occurs in the added code:
> > 
> >          switch (f->f_type) {
> >          case F_FORW:
> >                  /* Truncate messages to RFC 5426 recommended size. */
> >                  dprintf(" %s", f->fu_forw_hname);
> >                  switch (f->fu_forw_addr->ai_addr->sa_family) {
> > #ifdef INET
> >                  case AF_INET:
> >                          dprintf(":%d\n",
> >                              ntohs(satosin(f->fu_forw_addr->ai_addr)->sin_port));
> >                          iovlist_truncate(il, 480);
> >                          break;
> > #endif
> > 
> > There's more code for IPv6 and the function iovlist_truncate itself.
> > 
> > This change is not turned on by a switch and happens automatically, however I
> > can't find it documented in UPDATING or the release notes.  I would have
> > thought that any change in default behaviour of the system should at least be
> > documented.
> > 
> > Ideally this change would have been implemented via a switch given that the
> > RFC mentioned in the code (RFC 5426) does not mandate truncation, but
> > recommends it when the network MTU is not known.
> > 
> > What's the best way to reach out to the maintainer to suggest a switch to
> > turn on this code?
> > 
> > Thanks,
> > Scott
> 
> 
> Hi Scott,
> 
> Looks like this came in in base r332510 [1] via:
> 
> https://reviews.freebsd.org/D15011
> 
> The commit log message and review history may provide additional context 
> for the behaviour change (I haven't reviewed them)
> 
> I have CC'd the committer on this email, but in the meantime, and if you 
> wouldn't mind, it is worth reporting the issue via Bugzilla, so that we 
> track it, and so others can find it.
> 
> [1] https://svnweb.freebsd.org/changeset/base/332510
> 
> --
> Regards,
> 
> koobs
> 
> 
>