On 21/9/2015 6:17 μμ, Jan Just Keijser wrote:
> A client-connect script would be a much better option in this case.
> Unfortunately, there is no env var that contains the number of
> connected clients. Remember that a lost client-connection does not
> appear in the status/logs until the client session has expired.
> Personally I'd use a simple file-based counter to figure out which
> source IP address to use:
>
> count=`cat /var/log/clientcount.txt`
> let count++
> if [ $count -lt 6 ] ; then count=1 ; fi
> echo $count > /var/log/clientcount.txt
Thank you Jan,
I like your suggestion. (By the way, how did you get the output of the
env variables you listed?)
If we start from a value of 0 in the file (though it could be anything
in the range 0-5), I understand the script then should be:
count=`cat /var/log/clientcount.txt`
let count++
if [ $count -eq 6 ] ; then count=0 ; fi
echo $count > /var/log/clientcount.txt
(Note: -eq and not -lt.) Right?
Then, the last octet of the public ip address to assign (in our case)
would be: (150 + $count).
I would also like to mention that the local_ip to use in the ip tables
statement should not be the $trusted_ip but the $ifconfig_pool_local_ip,
which, however, is not available at client-connect time, so the script
should be run as a learn-address script. Please correct me if I'm wrong,
or suggest otherwise.
[Ref.: https://openvpn.net/archive/openvpn-users/2004-10/msg00780.html]
Also, the iptables statement should be removed on client disconnect, so
I imagine the whole setup as follows:
learn-address script:
---------------------
count=`cat /var/log/clientcount.txt`
let count++
if [ $count -eq 6 ] ; then count=0 ; fi
echo $count > /var/log/clientcount.txt
ip = $((150+count))
local_ip = $ifconfig_pool_local_ip
remote_ip = $trusted_ip
iptables -t nat -A POSTROUTING -s $local_ip -j SNAT --to-source
194.xxx.xxx.$ip
remove_nat_command = iptables -t nat -D POSTROUTING -s $local_ip -j
SNAT --to-source 194.xxx.xxx.$ip
echo $remove_nat_command > /var/log/openvpn/$remote_ip.txt
exit 0
client-disconnect script:
-------------------------
remote_ip = $trusted_ip
client_info_file = /var/log/openvpn/$remote_ip.txt
if [ -f $client_info_file ]
then
/var/log/openvpn/$client_info_file
rm -f /var/log/openvpn/$client_info_file
fi
exit 0
Nick
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