[SR-Users] Kamailio 5.4.4 and Siptrace

Daniel-Constantin Mierla miconda at gmail.com
Tue May 4 14:05:19 CEST 2021


Hello,

the interface selection is based on the conditions met at a specific
moment, depending also on the operations done in the code case by case.
If you want to enforce a specific one, then you have to specify it via
modparam.

Cheers,
Daniel

On 04.05.21 12:36, pwerspire wrote:
> Hello,
>
> I captured a tcpdump on this scenario and saw that in fact, the
> siptrace is sending the 403 Forbidden towards Homer.
> The issue is that for this local reply, Kamailio instead of using the
> private interface as it does for the other messages, is choosing the
> public interface, so the local reply doesn't arrive on heplify side.
>
> After forcing the socket with send_sock_addr, the reply appears on Homer.
> modparam("siptrace", "send_sock_addr", "sip:x.x.x.x:xxxx")
>
> From the documentation, I saw that if we don't use the send_sock_addr
> Kamailio will choose the interface, but shouldn't it choose always the
> same interface?
>
> Thanks for the help finding the issue.
> Regards,
> Tiago
>
>
> Daniel-Constantin Mierla <miconda at gmail.com
> <mailto:miconda at gmail.com>> escreveu no dia segunda, 3/05/2021 à(s) 21:58:
>
>     Hello,
>
>     logs indicate that the siptrace is engaged when the reply is sent out:
>
>     May 03 15:40:30  kamailio[6259]:  5(6267) DEBUG: siptrace
>     [siptrace_hep.c:496]: pipport2su(): the port string is 5060
>     May 03 15:40:30  kamailio[6259]:  5(6267) DEBUG: siptrace
>     [siptrace_hep.c:496]: pipport2su(): the port string is 58530
>     May 03 15:40:30  kamailio[6259]:  5(6267) DEBUG: <core>
>     [core/proxy.c:264]: mk_proxy(): doing DNS lookup...
>     May 03 15:40:30  kamailio[6259]:  5(6267) DEBUG: siptrace
>     [siptrace_hep.c:184]: trace_send_hep3_duplicate(): setting up the
>     socket_info
>
>     Can you watch the network traffic with ngrep/wireshark and check
>     if the reply is actually sent over?
>
>     Cheers,
>     Daniel
>
>     On 03.05.21 19:16, pwerspire wrote:
>>     Hello,
>>
>>     So I tested with the following configuration: 
>>
>>     modparam("siptrace", "duplicate_uri", "sip:x.x.x.x:9060")
>>     modparam("siptrace", "hep_mode_on", 1)
>>     modparam("siptrace", "trace_to_database", 0)
>>     #modparam("siptrace", "trace_flag", FLT_SIPTRACE)
>>     modparam("siptrace", "trace_on", 1)
>>     modparam("siptrace", "trace_mode", 1)
>>     modparam("siptrace", "hep_version", 3)
>>     modparam("siptrace", "hep_capture_id", 2040)
>>
>>     I can see this on the logs: 
>>
>>     May 03 15:40:30  kamailio[6259]: ) 5(6267) DEBUG: sl
>>     [sl_funcs.c:554]: sl_run_callbacks(): execute callback for event
>>     type 1
>>     May 03 15:40:30  kamailio[6259]:  5(6267) DEBUG: siptrace
>>     [siptrace.c:1842]: trace_sl_onreply_out(): trace off...
>>     May 03 15:40:30 kamailio[6259]:  5(6267) DEBUG: <core>
>>     [core/parser/msg_parser.c:620]: parse_msg(): SIP Reply  (status):
>>     May 03 15:40:30  kamailio[6259]:  5(6267) DEBUG: <core>
>>     [core/parser/msg_parser.c:622]: parse_msg():  version: <SIP/2.0>
>>     May 03 15:40:30  kamailio[6259]:  5(6267) DEBUG: <core>
>>     [core/parser/msg_parser.c:624]: parse_msg():  status:  <403>
>>     May 03 15:40:30  kamailio[6259]:  5(6267) DEBUG: <core>
>>     [core/parser/msg_parser.c:626]: parse_msg():  reason:  <Forbidden>
>>
>>     In attach is the log, I changed some of the values to mask the
>>     original values.
>>
>>
>>     Thanks,
>>     Regards,
>>     Tiago
>>
>>
>>     Daniel-Constantin Mierla <miconda at gmail.com
>>     <mailto:miconda at gmail.com>> escreveu no dia segunda, 3/05/2021
>>     à(s) 17:25:
>>
>>         Hello,
>>
>>         local replies should be captured with trace_mode=1. Run with
>>         debug=3 in kamailio.cfg and attach all log/debug messages
>>         printed by Kamailio for such case (from the INVITE to the ACK
>>         processing).
>>
>>         Cheers,
>>         Daniel
>>
>>         On 03.05.21 16:31, pwerspire wrote:
>>>         Hi,
>>>
>>>         Thanks for your reply.
>>>
>>>         We had the modparam("siptrace", "trace_mode", 1) but the
>>>         issue with that is that local error answers from kamailio
>>>         doesn't appear.
>>>
>>>         For example, when Kamailio receives the INVITE and replies
>>>         with a forbidden, the Invite and the ACK is there but the
>>>         Forbidden is not.
>>>
>>>         So with "trace_mode" 1 , everything works fine except this
>>>         messages missing and this was the problem that we tried to
>>>         solve messing around with the functions and flags.
>>>
>>>         Regards,
>>>         Tiago
>>>
>>>         Daniel-Constantin Mierla <miconda at gmail.com
>>>         <mailto:miconda at gmail.com>> escreveu no dia segunda,
>>>         3/05/2021 à(s) 15:39:
>>>
>>>             Hello,
>>>
>>>             On 03.05.21 11:02, pwer spire wrote:
>>>             > Hi,
>>>             >
>>>             > Any one have some idea about this? Or how it should be
>>>             configured in order to still have the original response
>>>             received in kamailio instead of the mapping one?
>>>
>>>             If you want all the traffic mirrored, then look at:
>>>
>>>               *
>>>             https://www.kamailio.org/docs/modules/stable/modules/siptrace.html#siptrace.p.trace_mode
>>>             <https://www.kamailio.org/docs/modules/stable/modules/siptrace.html#siptrace.p.trace_mode>
>>>
>>>             It is simpler that the use of functions and flags to
>>>             select what
>>>             messages should be mirrored.
>>>
>>>             Cheers,
>>>             Daniel
>>>
>>>             -- 
>>>             Daniel-Constantin Mierla -- www.asipto.com
>>>             <http://www.asipto.com>
>>>             www.twitter.com/miconda <http://www.twitter.com/miconda>
>>>             -- www.linkedin.com/in/miconda
>>>             <http://www.linkedin.com/in/miconda>
>>>             Kamailio Advanced Training - Online
>>>             May 17-20, 2021 (Europe Timezone) - June 7-10, 2021
>>>             (America Timezone)
>>>               *
>>>             https://www.asipto.com/sw/kamailio-advanced-training-online/
>>>             <https://www.asipto.com/sw/kamailio-advanced-training-online/>
>>>
>>>
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>>
>>         -- 
>>         Daniel-Constantin Mierla -- www.asipto.com <http://www.asipto.com>
>>         www.twitter.com/miconda <http://www.twitter.com/miconda> -- www.linkedin.com/in/miconda <http://www.linkedin.com/in/miconda>
>>         Kamailio Advanced Training - Online
>>         May 17-20, 2021 (Europe Timezone) - June 7-10, 2021 (America Timezone)
>>           * https://www.asipto.com/sw/kamailio-advanced-training-online/ <https://www.asipto.com/sw/kamailio-advanced-training-online/>
>>
>     -- 
>     Daniel-Constantin Mierla -- www.asipto.com <http://www.asipto.com>
>     www.twitter.com/miconda <http://www.twitter.com/miconda> -- www.linkedin.com/in/miconda <http://www.linkedin.com/in/miconda>
>     Kamailio Advanced Training - Online
>     May 17-20, 2021 (Europe Timezone) - June 7-10, 2021 (America Timezone)
>       * https://www.asipto.com/sw/kamailio-advanced-training-online/ <https://www.asipto.com/sw/kamailio-advanced-training-online/>
>
-- 
Daniel-Constantin Mierla -- www.asipto.com
www.twitter.com/miconda -- www.linkedin.com/in/miconda
Kamailio Advanced Training - Online
May 17-20, 2021 (Europe Timezone) - June 7-10, 2021 (America Timezone)
  * https://www.asipto.com/sw/kamailio-advanced-training-online/

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