Date: Wed, 13 Nov 2019 17:11:51 +1100 From: Kubilay Kocak <koobs@FreeBSD.org> To: Scott <freebsd-lists-5@thismonkey.com>, FreeBSD stable <freebsd-stable@freebsd.org> Cc: Ed Schouten <ed@freebsd.org> Subject: Re: syslogd truncating messages on FreeBSD >11.2-R Message-ID: <5265db9a-2eb2-6911-350a-aa1ed808da59@FreeBSD.org> In-Reply-To: <20191109030811.GA64882@thismonkey.com> References: <20191109030811.GA64882@thismonkey.com>
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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
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