[OpenSIPS-Users] 3.1 - access Path and Via values from REGISTER

[Mark Allen]

Thanks Johan - I'll try this out

On Mon, 3 Aug 2020 at 11:25, Johan De Clercq <Johan at democon.be> wrote:

> t_relay to the socket on which you are listening.
>
> Op ma 3 aug. 2020 om 12:21 schreef Mark Allen <mark at allenclan.co.uk>:
>
>> > If you want to see it, loopback the message.
>>
>> Thanks. How do I do that?
>>
>> On Mon, 3 Aug 2020 at 11:02, Johan De Clercq <Johan at democon.be> wrote:
>>
>>> I think that you are right.
>>> If you want to see it, loopback the message.
>>>
>>> Op ma 3 aug. 2020 om 11:16 schreef Mark Allen <mark at allenclan.co.uk>:
>>>
>>>> Would I be right in thinking that the reason I cannot immediately see
>>>> the "path" value added by the add_path_received() call is because of how
>>>> the lumps system works - i.e.
>>>>
>>>>   "lumps are stored in a list, and are only applied
>>>>    after the OpenSIPS script is fully executed and
>>>>    before the SIP message is relayed. Because of
>>>>    this, changes done on a SIP message are not
>>>>    immediately reflected on the SIP message upon
>>>>    further inspection ( eg. Adding a new header from
>>>>    the script and then checking for the header's
>>>>    existence )."
>>>>
>>>> From: https://www.opensips.org/Documentation/Development-Manual
>>>>
>>>> On Thu, 30 Jul 2020 at 16:24, Mark Allen <mark at allenclan.co.uk> wrote:
>>>>
>>>>> Seeking to find a workaround for the problem I'm having with WebRTC
>>>>> and AOR throttling (
>>>>> http://lists.opensips.org/pipermail/users/2020-July/043542.html) I
>>>>> want to access the values of the "Via" and "Path" headers that are being
>>>>> passed to the registrar.
>>>>>
>>>>> Using sngrep on the OpenSIPS server I can see the REGISTER includes
>>>>> Path and Via headers. If I try to access them with  $(hdr(Path)[0])  or
>>>>>  $(hdr(Via)[0])  I get nothing, but I can access the values of all the
>>>>> other headers without any problem - e.g.  $(hdr(Authorization)[0]). What am
>>>>> I missing or is there another way to get the info used in the Via
>>>>> and particularly in creating the Path header values???
>>>>>
>>>>>   add_path_received();
>>>>>   xlog("!!!!!!!!!!!! $(hdr(Path)[0]) !!!!!!!!!!");
>>>>>   $avp(attr) = $(hdr(Path)[0]);
>>>>>   mid_registrar_save("location","p0v");
>>>>>
>>>>> The code gives an "attr" value in the "location" table of "NULL"
>>>>>
>>>>> /var/log/syslog shows:
>>>>>
>>>>>   Jul 30 16:13:17  /usr/sbin/opensips[27423]: !!!!!!!!!!!! <null>
>>>>> !!!!!!!!!!
>>>>>
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