After further investigation I am considering the ipops module
dns_query() command.
http://kamailio.org/docs/modules/4.3.x/modules/ipops.html
It needs to be fast to prevent a bottleneck so I have a few things I
need to verify.
Will it save to/check internal DNS resolver cache first and if so how
many dns_querys can this handle before it starts to affect performance
or use excessive amounts of memory etc?
If not what can I use that uses the DNS resolver cache?
For what I am doing it would need to scale to many hundreds of DNS
Authenticated SIP trunks. So perhaps hundreds of querys/sec I suppose.
Perhaps many thousands of SIP extensions using those trunks but not
directly using DNS authentication themselves.
On 3/9/2015 4:27 AM, Daniel-Constantin Mierla wrote:
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
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