[nycbug-talk] some C help?
spork at bway.net
Thu Mar 22 20:56:41 EDT 2007
On Sat, 10 Mar 2007, Brian A. Seklecki wrote:
>>>> spamlogd is using):
>>>> listening on pflog0, link-type PFLOG (OpenBSD pflog file), capture size 68
>>>> rule 12/0(match): pass out on fxp0: 10.10.10.9 > 10.10.10.10: [|tcp]
>>>> But then it spits this out to syslog:
> This bug is pretty well documented in a ticket I opened with the NetBSD
> folks on the default size of the "snaplen" size being determined based on
> the presence of the IPv6 at compile-time v.s. run-time v.s "-i" argument.
> -s 96 or -s 128 for the win.
I told you guys I move slowly...
I actually didn't want to touch spamlogd so I recompiled tcpdump with
SPAPLEN set to 96 for v4 or v6. I'll need to see if there's a PR on this
with FreeBSD and if not file one referencing your NetBSD report.
All seems well:
Mar 22 03:03:31 slimjim spamlogd: invalid ip address 10.10.10
<restart spamlogd after rebuilding tcpdump>
Mar 22 20:53:25 slimjim spamlogd: outbound 10.10.10.3
[root at slimjim /usr/src/usr.sbin/tcpdump]# spamdb
WHITE|10.10.10.3|||1174611205|1174611205|1177721605|1|0 <<-- bingo
[root at slimjim /usr/src/usr.sbin/tcpdump]#
>>>> Mar 10 00:09:24 slimjim spamlogd: invalid ip address 10.10.10
>>>> Note the lack of the final octet.
>>>> This is (I hope) the area where spamlogd parses the output of tcpdump:
>>> yes, it is, but no need to analyze it...
>>> it does its job correctly.
>>>> That chunk makes very little sense to me.
>>>> Can anyone give me a quick shove in the right direction?
>>> ...and the reason yours is failing is not because of that chunk of code,
>>> but rather your pflog interface. it should look like:
>>> [blah] 10.10.10.9.XXXX > 10.10.10.10.25: [blah]
>>> where XXXX is an ephemeral port...basically your log is dropping the
>>> port number. why? i don't know - what does your pf rule look like?
>> oh, and i'll add that -current (and 4.1) doesn't spawn tcpdump any more,
>> but uses pcap directly....plus lots of other yummy features - ask for
>> the port to get upgraded ;)
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> -lava (Brian A. Seklecki - Pittsburgh, PA, USA)
> "...from back in the heady days when "helpdesk" meant nothing, "diskquota"
> meant everything, and lives could be bought and sold for a couple of pages
> of laser printout - and frequently were."
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