Re: [SR-Users] loose_route() and FQDN

Sergiu,

Actually, yes

Problem is in order of checking in this function

https://github.com/kamailio/kamailio/blob/02240711239149e2f5c4890a70ab158d10...

if (((ip = str2ip(&(puri.host))) == NULL)                 && ((ip = str2ip6(&(puri.host))) == NULL)) {             LM_DBG("uri host is not an ip address\n");             return -1;         }

So, it's checking if Record-Route is an IP address before actually calling *check_self()* function. I'll add an issue.

Regards, Igor

On 08.05.2021 02:42, Sergiu Pojoga wrote:

May be related to a previous topic about is_first_hop() and 'myself'

https://lists.kamailio.org/pipermail/sr-users/2018-October/103261.html https://lists.kamailio.org/pipermail/sr-users/2018-October/103261.html

On Fri, May 7, 2021 at 7:22 PM David Villasmil <david.villasmil.work@gmail.com mailto:david.villasmil.work@gmail.com> wrote:

Can you share a trace?

On Fri, 7 May 2021 at 21:12, Igor Olhovskiy
<igorolhovskiy@gmail.com <mailto:igorolhovskiy@gmail.com>> wrote:

    Yes. It passesuri == myself condition on auth.

    Regards,
    Igor

    On 07.05.2021 17:32, David Villasmil wrote:

...

    Have you tried verifying Kamailio actually believes the FQDN
    is itself?

    Regards,

    David Villasmil
    email: david.villasmil.work@gmail.com
    <mailto:david.villasmil.work@gmail.com>
    phone: +34669448337


    On Fri, May 7, 2021 at 4:18 PM Igor Olhovskiy
    <igorolhovskiy@gmail.com <mailto:igorolhovskiy@gmail.com>> wrote:

        David,

        Yes, I did added it, means it was there, but
        is_first_hop() was blocking adding it. I think it's some
        leftovers from default config.

        So, my conclusion, that is_first_hop() is ok with IP
        addresses, but not ok with FQDN in route. Although FQDN
        is added as alias

        Regards,
        Igor

        On 07.05.2021 16:07, David Villasmil wrote:

...

        Did you add the handle_ruri_alias() as suggested by
        Daniel? I had something like this where I would get
        “unable to resolve blah blah blah" and it’s because the
        RURI is the actual wss “address” which is unresolvable,
        so executing the function forces kamailio to take the
        alias instead.


        On Fri, 7 May 2021 at 13:48, Igor Olhovskiy
        <igorolhovskiy@gmail.com
        <mailto:igorolhovskiy@gmail.com>> wrote:

            Daniel,

            Seems to be it's really the case, but with other
            function

            With FQDN in RR


                  |is_first_hop()|

            is not acting correctly for reply.

...

            For incoming SIP replies, it means that top
            Record-Route URI is 'myself' and source address is
            not matching it

            But in Record-Route we have "myself", but
            *is_first_hop()* returning 0.

            Thanks!

            Regards,
            Igor

            On 07.05.2021 14:22, Daniel-Constantin Mierla wrote:

...

            OK, because looping was something that should not
            have happened in this case.

            Then the problem is that you do not do
            nat-traversal-like processing for websocket/webrtc
            traffic. You have to use set_contact_alias() +
            handle_ruri_alias() because the webrtc endpoints do
            not set "valid" contact addresses.

            Cheers,
            Daniel

            On 07.05.21 14:13, Igor Olhovskiy wrote:

...

            Ah, no, sorry, I was wrong at this one,

            This just is not sent with "unable to resolve
            address toleivu2gdbh.invalid".

            Sorry. Looping were something else during my
            tests, this just with *advertise* added

            Regards,
            Igor
            On 07.05.2021 14:02, Daniel-Constantin Mierla wrote:

...

            This looks like incoming ACK, because there is
            only one Via header, so it is not what proxy
            forwards -- that one is relevant to see what
            headers were consumed and added.

            Cheers,
            Daniel

            On 07.05.21 13:51, Igor Olhovskiy wrote:

> Sure. > > ACK sip:88290@toleivu2gdbh.invalid;transport=wss > SIP/2.0 > Via: SIP/2.0/UDP > A_IP_ADDRESS:5060;rport;branch=z9hG4bKPj8d05548a-91ef-4332-8617-32f8eeebf8f2 > From: > sip:88881@A_IP_ADDRESS;tag=0a3e31a6-96ad-42d0-9310-81b35cedbd3d > To: sip:88290@KAMAILIO_FQDN;tag=hvra7mj3q0 > Call-ID: 46f44741-d155-4dd5-8fd8-78e540fc1acb > CSeq: 18326 ACK > Route: > sip:KAMAILIO_FQDN;lr;r2=on;ftag=0a3e31a6-96ad-42d0-9310-81b35cedbd3d;nat=wss > Route: > sip:KAMAILIO_FQDN:8089;transport=ws;lr;r2=on;ftag=0a3e31a6-96ad-42d0-9310-81b35cedbd3d;nat=wss > Max-Forwards: 70 > User-Agent: Asterisk PBX 13.33.0 > Content-Length:  0 > > > By loop I meant, Kamailio just relaying it back > to self and discard. > > Regards, > Igor > On 07.05.2021 13:48, Daniel-Constantin Mierla wrote: >> >> Can you paste the ACK that loops, after being >> handled once by Kamailio? >> >> Cheers, >> Daniel >> >> On 07.05.21 13:25, Igor Olhovskiy wrote: >>> >>> Daniel, >>> >>> Yes, it is. >>> >>> alias=... >>> >>> Also tried with >>> >>> listen = IP advertise FQDN >>> >>> same behavior, loose_route() stops acting >>> correctly. >>> >>> PS: Forgot to add, Kamailio 5.4.3 / 5.4.4 >>> >>> Regards, >>> Igor >>> On 07.05.2021 13:21, Daniel-Constantin Mierla >>> wrote: >>>> >>>> Hello, >>>> >>>> is the KAMAILIO_FQDN set as local domain for >>>> Kamailio (via alias parameter or domain >>>> module+register myself)? >>>> >>>> Cheers, >>>> Daniel >>>> >>>> On 07.05.21 11:17, Igor Olhovskiy wrote: >>>>> >>>>> Hello, >>>>> >>>>> I saw there are some topics on this already >>>>> and carefully walked through all of them, >>>>> but can't solve following issue. >>>>> >>>>> For a reason I do need that in Record-Route >>>>> header sent to endpoint would present FQDN. >>>>> If it matters, it's UDP/WSS conversion done >>>>> on Kamailio. >>>>> >>>>> So, scheme is quite simple >>>>> >>>>> Enpoint A ->UDP-> Kamailio ->WSS-> Endpoint >>>>> B (NAT) >>>>> >>>>> Main issue here, that if in Record-Route >>>>> headers it's FQDN, but not IP addresses, on >>>>> a new transactions with a dialog (ACK on >>>>> 200, PRACK, BYE), Kamailio*loose_route()* >>>>> function resolves address of destination not >>>>> current dialog, but actual R-URI (or itself, >>>>> if R-URI is something from WebRTC world) >>>>> that is not correct due to NAT. >>>>> >>>>> If in RR headers IP addresses are present - >>>>> all is working as expected. >>>>> >>>>> As an example (RR with FQDN) >>>>> >>>>> B answers 200 >>>>> >>>>> SIP/2.0 200 OK >>>>> Record-Route: >>>>> sip:KAMAILIO_FQDN:8089;transport=ws;r2=on;lr=on;ftag=0a3e31a6-96ad-42d0-9310-81b35cedbd3d;nat=wss >>>>> Record-Route: >>>>> sip:KAMAILIO_FQDN;r2=on;lr=on;ftag=0a3e31a6-96ad-42d0-9310-81b35cedbd3d;nat=wss >>>>> Via: SIP/2.0/UDP >>>>> <A_IP_ADDRESS>:5060;received=A IP >>>>> ADDRESS;rport=5060;branch=z9hG4bKPj67fb6d86-97d7-4231-995b-e54b0f62881e >>>>> To: <sip:88290@<KAMAILIO_FQDN>>;tag=hvra7mj3q0 >>>>> From: >>>>> <sip:+XXXX7688881@<KAMAILIO_FQDN>>;tag=0a3e31a6-96ad-42d0-9310-81b35cedbd3d >>>>> Call-ID: 46f44741-d155-4dd5-8fd8-78e540fc1acb >>>>> CSeq: 18326 INVITE >>>>> Contact: >>>>> sip:88290@toleivu2gdbh.invalid;transport=wss >>>>> Allow: >>>>> ACK,CANCEL,INVITE,MESSAGE,BYE,OPTIONS,INFO,NOTIFY,REFER >>>>> Supported: outbound >>>>> Content-Type: application/sdp >>>>> Content-Length: 817 >>>>> >>>>> >>>>> ACK looks like >>>>> >>>>> ACK >>>>> sip:88290@toleivu2gdbh.invalid;transport=wss >>>>> SIP/2.0 >>>>> Via: SIP/2.0/UDP >>>>> A_IP_ADDRESS:5060;rport;branch=z9hG4bKPj8d05548a-91ef-4332-8617-32f8eeebf8f2 >>>>> From: >>>>> sip:88881@A_IP_ADDRESS;tag=0a3e31a6-96ad-42d0-9310-81b35cedbd3d >>>>> To: sip:88290@KAMAILIO_FQDN;tag=hvra7mj3q0 >>>>> Call-ID: 46f44741-d155-4dd5-8fd8-78e540fc1acb >>>>> CSeq: 18326 ACK >>>>> Route: >>>>> sip:FQDN;lr;r2=on;ftag=0a3e31a6-96ad-42d0-9310-81b35cedbd3d;nat=wss >>>>> Route: >>>>> sip:FQDN:8089;transport=ws;lr;r2=on;ftag=0a3e31a6-96ad-42d0-9310-81b35cedbd3d;nat=wss >>>>> Max-Forwards: 70 >>>>> User-Agent: Asterisk PBX 13.33.0 >>>>> Content-Length: 0 >>>>> >>>>> And Kamailio on *loose_route()* loops ACK to >>>>> itself. (with result of function == 1) >>>>> >>>>> In a case if in Record-Route/Route headers >>>>> just IP address of Kamailio present, all >>>>> works as expected, but it's not really >>>>> behavior I want to achieve. >>>>> >>>>> I've tried to play with >>>>> *record_route_preset("...")* specifying only >>>>> WSS part (as suggested in >>>>> https://skalatan.de/de/blog/kamailio-sbc-teams >>>>> https://skalatan.de/de/blog/kamailio-sbc-teams) >>>>> with FQDN, but no luck. >>>>> >>>>> Also wanted to try approach using >>>>> record_route_preset() function in branch >>>>> route, but it was working only with first >>>>> branch, not affecting others (but I assume >>>>> having different RR headers across branches >>>>> is not a good idea) >>>>> >>>>> -- >>>>> Regards, >>>>> Igor >>>>> >>>>> __________________________________________________________ >>>>> Kamailio - Users Mailing List - Non Commercial Discussions >>>>> *sr-users@lists.kamailio.org mailto:sr-users@lists.kamailio.org >>>>> Important: keep the mailing list in the recipients, do not reply only to the sender! >>>>> Edit mailing list options or unsubscribe: >>>>> *https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users >>>> -- >>>> 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/ >>> >>> __________________________________________________________ >>> Kamailio - Users Mailing List - Non Commercial Discussions >>> *sr-users@lists.kamailio.org mailto:sr-users@lists.kamailio.org >>> Important: keep the mailing list in the recipients, do not reply only to the sender! >>> Edit mailing list options or unsubscribe: >>> *https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users >> -- >> 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  <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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        David Villasmil
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        <mailto:david.villasmil.work@gmail.com>
        phone: +34669448337

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