[OpenSER-Users] How to check if $rd lies in an IP range

[Daniel-Constantin Mierla]

Hello,

it is another way, a bit more complex in the config file, but does not 
require to execute external scripts.

All you need is to play with transformations and arithmetic operations 
in the config file. The idea is to convert to integer the IP addresses 
apply bitmask and compare. Transformations that help:
- http://www.openser.org/dokuwiki/doku.php/transformations:devel#s.int
- 
http://www.openser.org/dokuwiki/doku.php/transformations:devel#s.select_index_separator

For example:
$rd = 23.34.56.78

To get second number (34) as integer $(rd{s.select,1,.}{s.int})

You transform the four parts in numbers, multiply each with the proper 
value, make the sum and apply the bitwise 'and' operation with the mask.

Should get what you need.

Cheers,
Daniel


On 03/21/08 03:41, Sergio Gutierrez wrote:
> Hi Josh.
>
> An approach we used is execute an external script through function 
> exec_msg; the script receives as argument the source ip address, and 
> by external means, it checks whether it belongs to a particular 
> subnet, defined on a table in database or a file; we used PHP and a 
> table in MySQL with the reference subnets.
>
> The script should return 0 or 1; when returns 0, exec_msg returns 
> true, and when it returns 1; exec_msg returns false, so you can check 
> it into an if statement.
>
> Hope it helps.
>
> Best regards.
>
> Sergio Gutiérrez.
>
> On Thu, Mar 20, 2008 at 4:34 PM, Josh Mahonin <jmahonin at cbnco.com 
> <mailto:jmahonin at cbnco.com>> wrote:
>
>     Hi folks,
>
>     In my setup, I've got two disjoint subnets (call then A and B) that
>     cannot communicate directly to each other, but devices on each can
>     both
>     communicate to my OpenSER server and Asterisk box (both on their own
>     subnet, C).  There is no NAT involved, so I only want to use rtpproxy
>     when it's the case that device from subnet A attempts to call a device
>     on subnet B, or vice-versa.
>
>     I would ideally not like to use rtp proxy for communication
>     between A-C
>     and A-B (this will enable RTP media between both subnets, but that
>     solution will not scale very well...)
>
>     I'm attempting do something like this:
>
>     if (src_ip == a.b.c.d/24 && dst_ip == w.x.y.z/24)
>        use rtp proxy
>
>     But unfortunately, on an INVITE, after a lookup, dst_ip is set to the
>     OpenSER server.  The pseudovariable $rd is set to the value I'd
>     like to
>     check against, but it complains loudly when I attempt to substitute
>     dst_ip for $rd.
>
>     Is there any way to use avp_check() or the like to verify that the
>     value
>     in $rd lies in a given subnet?  I don't want to match just one IP,
>     but a
>     whole range.  I found a similar question on the SER mailing list asked
>     several years ago, with no response.
>
>     Thanks,
>
>     Josh
>
>
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