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

Johan De Clercq Johan at democon.be
Mon Aug 3 10:22:59 EST 2020


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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