[SR-Users] how can I use WITH_IPAUTH when the IP may be stored in the DB as a FQDN?

[Daniel-Constantin Mierla]

Hello,


On 08/03/15 21:38, canuck15 wrote:
> Here is is the relevant section of kamailio.cfg
>
> $var(tempfU) = $fU;
> #!ifdef WITH_IPAUTH
>     if((!is_method("REGISTER")) && allow_source_address() && $au == "")
>     {
>         # Loading $fU from database using IP
>
>         sql_pvquery("elxpbx", "SELECT name FROM sip WHERE host = '$si'
> AND sippasswd IS NULL", "$var(tempfU)");
>
>         # source IP allowed
>         return;
>     }
>
> The problem is that when host= somefqdn.com the above will fail since
> $si will always be an IP address as far as I can tell.  More often
> than not host= is a fqdn and requiring it to always be an IP address
> is not an option.  Converting it to IP before storing it in the DB is
> also not an option because it needs to be able to work of the IP
> address changes.
>
> So how can the above be done to accomodate the possibility that host=
> somefqdn.com or an IP address.  Preferably in such a way that it can
> scale to hundreds/thousands of rows in the database without slowing
> things down or crashing.

as first remark, note that permissions module can work with hostanmes in
the address table.

On the other hand, having what you want might not work. If you want to
test if a request comes from xyz.com, doing a dns query on xyz.com can
return a different IP than what was used for sending. If xyz.com has
many IP addresses associated with and they do load balancing, they are
usually returning just a subset of their IP addresses, not all of them.

In this case, the best is to discover the subnet addresses used by
xyz.com and store them in the address table, then use permissions in the
config.

Otherwise, you can try by doing a query and extract all hostnames from
the database with sqlops and then loop through them and test with the
functions from ipops module. You must have a fast dns server in order to
not slow down the processing in the case you have lots of hostnames.

Cheers,
Daniel

-- 
Daniel-Constantin Mierla
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Kamailio World Conference, May 27-29, 2015
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