Date: Mon, 22 Nov 2004 13:27:50 +0200 From: Giorgos Keramidas <keramida@linux.gr> To: Ciprian BADESCU <cbadescu@aspc.cs.utt.ro> Cc: freebsd-security@freebsd.org Subject: Re: [Fwd: Re: Importing into rc.firewal rules] Message-ID: <20041122112750.GA994@orion.daedalusnetworks.priv> In-Reply-To: <2274.82.77.156.141.1101035802.squirrel@82.77.156.141> References: <2274.82.77.156.141.1101035802.squirrel@82.77.156.141>
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On 2004-11-21 13:16, Ciprian BADESCU <cbadescu@aspc.cs.utt.ro> wrote:
> > On Sat, Nov 20, 2004 at 01:32:15PM -0500, Francisco Reyes wrote:
> >> I have a grown list of IPs that I am "deny ip from ###.### to any".
> >> Infected machines, hackers, etc..
> >>
> >> Is there a way to have this list outside of rc.firewall and just
> >> read it in?
>
> from man ipfw
>
> LOOKUP TABLES
> Lookup tables are useful to handle large sparse address sets, typically
> from a hundred to several thousands of entries. There could be 128
> different lookup tables, numbered 0 to 127.
> [...] here is an example: [...]
> To set the table you could use a file /etc/badboys
> and a short shell script executed before the table denying rules:
> for i in `cat /etc/badboys`; do ${fwcmd} table 0 add $i; done;
If the table is going to grow at least a few thousand entries you
might hit the command line length limit. Try something like this
instead:
while read ipaddr ;do
${fwcmd} table 0 add "${ipaddr}"
done < /etc/badhosts
Getting the lines one by one can be bit slow but it's more flexible.
Another good idea may be to use a custom awk script to parse the
badhosts file and ``generate'' sh(1) code that is run to populate the
table:
badtable=0
fwcmcd="ipfw -q"
awk -v fwcmd="${fwcmd}" -v tab="${badtable}" \
'! /^[ ]*#/ {
printf "%s table %d add %s", fwcmd, tab, $1 }' | sh
This is probably going to be a bit faster than while read ...
- Giorgos
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