[OpenSIPS-Users] check_source_address()

[Liviu Chircu]

On 24.04.2019 20:10, Mark Farmer wrote:
> Sure, I'll send the pcap off list.

It seems you are performing an interface switching operation when 
routing out,
which leads to a double Record-Route header.  While this is completely fine,
you should be aware that OpenSIPS handles a double RR'ed mid-dialog 
request by
routing the request to itself exactly once, as it consumes the top-level 
Route
header field.

So, you definitely don't have to provision and mark OpenSIPS as a trunk, 
since
that will likely break some other logic of your script (e.g. I see it 
now returns
404 in the pcap).  Rather, just extend your possible sources of traffic 
and keep
applying loose_route() to those mid-dialog requests, then route them out:

if (check_source_address("1","$avp(trunk_attrs)")) {
     # request comes from trunks
     xlog ("MF - $rm FROM $avp(trunk_attrs)");
     setflag(IS_TRUNK);
} else if (has_totag() && is_myself("$si")) {
     setflag(IS_MYSELF);
} else {
     send_reply("403", "Forbidden");
     exit;
}

if (has_totag()) {
     ...
     if (!loose_route())
         send_reply("404", "Not Here");
     else
         t_relay();
     exit;
}

Regards,

-- 
Liviu Chircu
OpenSIPS Developer
http://www.opensips-solutions.com