[SR-Users] Create new listener on the fly
Daniel-Constantin Mierla
miconda at gmail.com
Wed Nov 23 16:38:53 CET 2022
Hello,
noting I don't use the ims modules and I do not know what they are
supposed to do, but the initial design for the pool of worker processes
was to be able to call module init and child init callbacks before any
traffic is handled. Alex provided details on memory initialization as well.
Case by case a module can listen on additional sockets, like ctl does
for rpc commands, or lwsc with websocket client connections.
If an ims module need work with new sockets, then the module can
implement the mechanism for it, the developer has the whole C language
at hand. The implementation tcp layer does it with new tcp connections,
having a tcp connections manager.
Obviously, if someone wants to contribute it for the classic sip
workers, a PR can be made, it can be merged upon review.
Cheers,
Daniel
On 23.11.22 16:03, Oleg Belousov wrote:
> Hello.
> I'm wondering why not having the ability to create a SIP listener on
> the fly/usage instead of bunch of listeners at startup can be a
> limitation. I believe each listener can serve multiple ipsec
> connections, or it is not the case?
> --
> obelousov.tel <http://obelousov.tel>
>
>
> On Thu, Oct 27, 2022 at 5:26 PM Carsten Bock <carsten at ng-voice.com> wrote:
>
> Hi Hossein,
>
> due to those limitations, we are using a custom, in-house solution
> for our MNO/MVNO deployments, which we haven't released as
> open-source (yet).
>
> Thanks,
> Carsten
>
> --
> Carsten Bock I CTO & Founder
>
> ng-voice GmbH
>
> Trostbrücke 1 I 20457 Hamburg I Germany
> T +49 179 2021244 I www.ng-voice.com <http://www.ng-voice.com/>
>
> Registry Office at Local Court Hamburg, HRB 120189
> Managing Directors: Dr. David Bachmann, Carsten Bock
>
>
>
> Am Mi., 26. Okt. 2022 um 18:29 Uhr schrieb H Yavari
> <hyavari at rocketmail.com>:
>
> Hi Casrten,
>
> Thanks for the comment. I know you provide IMS, have you
> contributed to Kamailio IPsec, or do you have something
> in-house solution for this part? (I hope this question will
> not be off-topic)
>
> BR
> Hossein
>
>
> On Wednesday, October 26, 2022 at 06:37:33 AM PDT, Carsten
> Bock <carsten at ng-voice.com> wrote:
>
>
> Hi Hossein,
>
> yes, you are right, it is in-efficient. It may be fine for a
> private network/PoC/Lab/ or anything else small, but it will
> not really work for a commercial network - for that you need
> something different.
>
> Thanks,
> Carsten
> --
> Carsten Bock I CTO & Founder
>
> ng-voice GmbH
>
> Trostbrücke 1 I 20457 Hamburg I Germany
> T +49 179 2021244 I www.ng-voice.com <http://www.ng-voice.com/>
>
> Registry Office at Local Court Hamburg, HRB 120189
> Managing Directors: Dr. David Bachmann, Carsten Bock
>
>
>
> Am Di., 25. Okt. 2022 um 23:03 Uhr schrieb H Yavari
> <hyavari at rocketmail.com>:
>
> Thanks Alex for your elaboration; you are right.
> This is the reason that the current ims_ipsec module will
> create a bunch of listeners at startup that looks not
> efficient.
>
>
> Regards,
> Hossein
>
>
> On Tuesday, October 25, 2022 at 01:28:38 PM PDT, Alex
> Balashov <abalashov at evaristesys.com> wrote:
>
>
> Well, no, it just stems from some knowledge of Kamailio’s
> multiprocess architecture.
>
> Kamailio uses a static pool of preforked SIP worker
> processes, and this is initialised once upon startup.
> These child processes are spawned for every listener, and
> communicate and share data using SysV IPC and shared
> memory. The shared memory pool is likewise initialised
> upon startup, as is the small fixed-size area of private
> memory associated with each other worker process (“package
> memory”).
>
> While perhaps not strictly impossible to alter, this setup
> isn’t particularly amenable to the dynamic creation and
> destruction of listeners, or the additional child
> processes they beget. The child processes need to be
> forked on startup, before their heap is laden with runtime
> baggage. All this is relatively expensive to initialise.
>
> — Alex
>
> > On Oct 25, 2022, at 4:14 PM, H Yavari
> <hyavari at rocketmail.com> wrote:
> >
> > Thanks Alex.
> > Is there any document or material that tells more about
> those reasons?
> >
> >
> > Regards,
> > Hossein
> >
> >
> > On Tuesday, October 25, 2022 at 01:00:18 PM PDT, Alex
> Balashov <abalashov at evaristesys.com> wrote:
> >
> >
> > Hi,
> >
> > Unfortunately, for a variety of architectural reasons,
> this is not practical.
> >
> > — Alex
> >
> > > On Oct 25, 2022, at 12:43 PM, H Yavari
> <hyavari at rocketmail.com> wrote:
> > >
> > > Hi Kamailio community,
> > >
> > >
> > > I am running an IPsec server beside Kamailio, so I am
> interested to know if there is any method to create a SIP
> listener on a specific port on the fly. I mean, when I
> create the IPsec SAs through the IPsec server, I ask
> Kamailio to create a listener/handler for that port too.
> > > This case might be very rare, but it is always good to
> hear community ideas.
> > >
> > > Thank you.
> > >
> > > Regards,
> > > Hossein
> >
> > > __________________________________________________________
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> > --
> > Alex Balashov | Principal | Evariste Systems LLC
> >
> > Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)
> > Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
> >
> >
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> --
> Alex Balashov | Principal | Evariste Systems LLC
>
> Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)
> Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
>
>
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--
Daniel-Constantin Mierla -- www.asipto.com
www.twitter.com/miconda -- www.linkedin.com/in/miconda
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