[SR-Users] Via in locally generated PUBLISH (using different presence server address)

Sat Aug 13 10:36:27 CEST 2016

I just looked at the pua table, and I dont have any records in the 
table, so I presume this error message occurs when reading the in-memory 
structure when pua module tries to update the database.

Is there a way I can see what the in memory structure looks like to see 
what the via header looks like?

On 12/08/2016 13:22, Asgaroth wrote:
> Update:
>
> I've just noticed that the error's I'm seeing roughly appear every 20 
> seconds after an attempted locall generated publish is sent when 
> rewriting the via header in the event-route.
>
> This seems to corrolate with my db update interval which is set to 20 
> seconds.
>
> I'm wondering if the via header re-write was not written to the pua 
> table correctly. I cannot run the msg_apply_changes() function in 
> event-route so I'm stuck with this error message.
>
> I wonder, would it be possible to have a module parameter to specify 
> the sending socket if/when the outbound_proxy parameter is set? I 
> presume, then, the Via header would be generated correctly.
>
> Any thoughts on how I could work around this issue?
>
> Thanks
>
>
>
> On 09/08/2016 09:31, Asgaroth wrote:
>> Hi Daniel,
>>
>> I've just sent the captures on to you privately.
>>
>> Thanks
>>
>> On 09/08/2016 08:34, Daniel-Constantin Mierla wrote:
>>> Hello,
>>>
>>> can you send the pcap with sip messages for such situation? It will 
>>> help
>>> to understand if Via is used corerctly for replies.
>>>
>>> Cheers,
>>> Daniel
>>>
>>>
>>> On 08/08/16 18:51, Asgaroth wrote:
>>>> Hi All,
>>>>
>>>> I have a configuration where we run a multi-homed proxy/loadbalancer
>>>> and a seperate internal presence server. We then use
>>>> pua/pua-dialoginfo on the proxies to publish dialog state to the
>>>> internal presence server.
>>>>
>>>> The proxies listen on udp:external_ip:5062 and udp:internal_ip1:5060.
>>>> The presence server listens on udp:internal_ip2:5060 on a seperate
>>>> server.
>>>>
>>>> The problem I am coming accross is that when kamailio generates a
>>>> PUBLISH message for some dialogs it creates the via header with
>>>> address external:ip:5062, however the pua module is configured to send
>>>> to the presence server address on internal_ip2:5060. I have a route
>>>> which forces the sending socket ($fs) to be udp:internal_ip1:5060.
>>>>
>>>> What happens then is that the presence server tries to send the 200
>>>> reply to the PUBLISH message back to internal_ip1:5062 (when it should
>>>> be internal_ip1:5060), I'm thinking this is because the Via header has
>>>> host as external_ip:5062.
>>>>
>>>> Is it possible, from event-route[tm:local-request] to rewrite the via
>>>> header so that it reflects internal_ip1:5060 instead of 
>>>> external_ip:5062?
>>>>
>>>> I did try the following snippet from event-route[tm:local-request],
>>>> but I got module parse errors on the Via header:
>>>>
>>>> if (is_method("PUBLISH")) {
>>>>        subst_hf("Via", "/ 1\.2\.3\.[0-9]+:5062;/
>>>> $sel(cfg_get.socket.internal_ip);/", "f");
>>>> }
>>>>
>>>> [7370]: ERROR: <core> [parser/parse_via.c:2607]: parse_via():
>>>> ERROR:parse_via on <1> state 5 (default)
>>>> [7370]: ERROR: <core> [parser/parse_via.c:2708]: parse_via(): ERROR:
>>>> parse_via on: <SIP/2.0/UDP
>>>> external_ip:5062;branch=z9hG4bK96eb.0f014ae4000000000000000000000000.0#015#012 
>>>>
>>>> internal_ip1;
>>>> [7370]: ERROR: <core> [parser/parse_via.c:2712]: parse_via(): ERROR:
>>>> parse_via parse error, parsed so far:<SIP/2.0/UDP
>>>> external_ip:5062;branch=z9hG4bK96eb.0f014ae4000000000000000000000000.0#015#012 
>>>>
>>>> [7370]: ERROR: <core> [parser/msg_parser.c:125]: get_hdr_field():
>>>> ERROR: get_hdr_field: bad via
>>>> [7370]: INFO: <core> [parser/msg_parser.c:338]: parse_headers():
>>>> ERROR: bad header field [Via: SIP/2.0/UDP 1]
>>>> [7370]: ERROR: <core> [parser/msg_parser.c:690]: parse_msg(): ERROR:
>>>> parse_msg: message=<PUBLISH sip:user at domain;transport=UDP
>>>> SIP/2.0#015#012Via: SIP/2.0/UDP
>>>> external_ip:5062;branch=z9hG4bK96eb.0f014ae4000000000000000000000000.0#015#012 
>>>>
>>>> internal_ip1;To: <sip:user at domain;transport=UDP>#015#012From:
>>>> <sip:user at domain;transport=UDP>;tag=3e8fdaca277026bf3e6d75c5e5313096-f162#015#012CSeq: 
>>>>
>>>> 10 PUBLISH#015#012Call-ID:
>>>> 5634294b786134b3-7370 at external_ip#015#012Content-Length:
>>>> 692#015#012User-Agent: kamailio (bfievklb04)#015#012Max-Forwards:
>>>> 70#015#012Event: dialog#015#012Expires: 10901#015#012Content-Type:
>>>> application/dialog-info+xml#015#012#015#012<?xml
>>>> version="1.0"?>#012<dialog-info
>>>> xmlns="urn:ietf:params:xml:ns:dialog-info" version="0" state="full"
>>>> entity="sip:user at domain;transport=UDP">#012  <dialog
>>>> id="mvqXXaAr24DHdfsffYKZeA.." call-id="mvqXXaAr24DHdfsffYKZeA.."
>>>> direction="initiator">#012 <state>Trying</state>#012    <remote>#012
>>>> <identity>sip:1234567 at domain;transport=UDP</identity>#012 <target
>>>> uri="sip:1234567 at domain;transport=UDP"/>#012 </remote>#012
>>>> <local>#012 <identity>sip:user at domain;transport=UDP</identity>#012
>>>> <target uri="sip:user at domain;transport=UDP"/>#012 </local>#012
>>>> </dialog>#012</dialog-info>#012>
>>>> [7370]: ERROR: <core> [msg_translator.c:3057]:
>>>> build_sip_msg_from_buf(): parsing failed
>>>> [7370]: ERROR: tm [uac.c:163]: uac_refresh_hdr_shortcuts(): failed to
>>>> parse msg buffer
>>>> [7370]: ERROR: tm [uac.c:487]: t_uac_prepare(): failed to refresh
>>>> header shortcuts
>>>> [7370]: ERROR: pua [send_publish.c:700]: send_publish(): in t_request
>>>> tm module function
>>>> [7370]: ERROR: pua_dialoginfo [dialog_publish.c:358]:
>>>> dialog_publish(): while sending publish
>>>>
>>>> To me, it looks like the replace section of the subst_hf sub
>>>> expression is being appended to the end of the via header instead of
>>>> replacing the address section found.
>>>>
>>>> I have sanitized the above output to not show internal details, but if
>>>> you need it, I can send it on to you privately.
>>>>
>>>> Am I going about this issue in the correct way, and, if so, where am I
>>>> going wrong with the subst_hf snippet above?
>>>>
>>>> Kamailio version is 4.3.6.
>>>>
>>>> Any pointers/tips/trciks are greatly appreciated.
>>>>
>>>> Thanks
>>>>
>>>> _______________________________________________
>>>> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing 
>>>> list
>>>> sr-users at lists.sip-router.org
>>>> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
>>
>