On Dec 19, 2006, at 6:56 PM, Christopher Hilton wrote:
Charles Sprickman wrote:
On Tue, 19 Dec 2006, Christopher Hilton wrote:
Oliver Fromme wrote:
Dimitry Andric wrote:
> Oliver Fromme wrote:
> > What does stuttering mean? Is it similar to sendmail's
> > "greet_pause" feature?
> > See here:
> http://www.ualberta.ca/~beck/nycbug06/spamd/mgp00014.html
OK, so the answer to my question seems to be "yes". :-)
Actually I'd say it's similar. If you telnet to port 25 on a
server that's using sendmail's greet_pause option I'm assuming
that you get nothing for 5 seconds. OpenSD's Spamd sends the
initial greeting at a rate of one character per second and only
accepts data from you at the same rate.
It also sets the window size to something like 1 byte. :)
Yes, it does. This results in the remote smtp daemon getting bound
up by it's own kernel.
Someone had mentioned that this would consume many threads/
processes, but that is not the case. Bob explained that spamd
runs in a select() loop. I don't totally understand that, but to
me it sounds like the same methodology that thttpd used, and that
sure scaled up nice.
It keeps an array of file descriptors, one for each connection to
the remote smtp daemon. It periodically uses the select(2) system
call to see which of the descriptors is ready and services them
accordingly.
Here's what I think is the latest version of Bob's talk. It's
quite good.
http://www.ualberta.ca/~beck/nycbug06/spamd/
There's audio available here:
http://www.nycbsdcon.org/slides
I heard the talk in the beginning of November, right about the
middle of the big October/November spamming event of '06. To me the
most interesting part of the talk was when he spoke about the
results of tarpitting his greylisted connections and how he
eliminated 1,300,000 Mail messages from a total of 3,000,000 before
they ever hit his MTA. That's the feature that's missing from
FreeBSD since the port pulls spamd from OpenBSD 3.7 and the
tarpitting feature was added in the revision right after the
release 3.7 tag.
Was the original question "when will the FreeBSD port be
updated"?? :)
Yes. There's lots of ways to do it. One could pull diff from the
openbsd cvs servers and drop it into the patch directory. That
should go cleanly but it would be nice to get this revved up to the
latest release. I've got a copy of the latest code to compile. The
call symantics of openbsd's openlog_r(3) and syslog_r(3) differ
from FreeBSD openlog(3) and syslog(3). But It should work. I need
to throw some polish on it but after I do I'll post the patches
here and send them to the port maintainer.
I know this is kind of old, but I'm needing to work with spamd on
FreeBSD and I noticed the port is still stuck at the 3.7 version.
Do you have anything that you'd like people to test?
Thanks,
Charles
-- Chris
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