[SR-Users] outgoing TCP connection ID

[Sergiu Pojoga]

I see, basically "it's complicated" with TCP. Thanks for the detailed
explanation. Using ipops resolution would be detrimental, I will look into
the hash table suggestion.

Thanks!

On Mon, Nov 2, 2020 at 1:48 PM Daniel-Constantin Mierla <miconda at gmail.com>
wrote:

> Hello,
>
> what's in kamailio memory related to a tcp connection may not be its
> actual state, because the kernel/tcp stack can be in reconnecting state
> without notifying the application layer. It can take up to a few minutes to
> get to timeout and report connection is closed. So I am not sure you can
> avoid send failure in t_relay(), and thus overall benefits could be minimal.
>
> Anyhow, look at the tcpops module, there is a function to get connection
> id by peer address/port, which you can get with next-hop variable before
> t_relay() (provided is not going to be fqdn, which may require mixing in
> ipops module).
>
> An alternative, if you need it for requests within dialog, you can use
> hash table to store the connection ID using call-id as key when processing
> the initial subscribe/invite, then you can retrieve it for bye/notify/...
>
> Cheers,
> Daniel
> On 02.11.20 19:04, Sergiu Pojoga wrote:
>
> Hi Daniel,
>
> In my case it's for an edge proxy scenario doing transport conversion, UDP
> backend to TCP/TLS client. So it would be after loose_route() followed by
> t_relay(). The initial TCP connection is established when a phone
> SUBSCRIBEs, later on the backend sends the in-dialog NOTIFY which often
> fails because the client & TCP connection is gone by now, causing a
> t_relay() failure.
>
> Thanks. Regards,
> --Sergiu
>
> On Mon, Nov 2, 2020 at 12:29 PM Daniel-Constantin Mierla <
> miconda at gmail.com> wrote:
>
>> Hello,
>>
>> do you need it in a generic way, or after some specific operations like
>> lookup("location")?
>>
>> Cheers,
>> Daniel
>> On 01.11.20 16:45, Sergiu Pojoga wrote:
>>
>> Hi there,
>>
>> Is there a PV that exposes the outgoing TCP connection ID? $conid seems
>> to be for received only.
>>
>> *$conid - The TCP connection ID of the connection the current message
>> arrived on for TCP, TLS, WS, and WSS. Set to $null for SCTP and UDP.*
>>
>> The objective is to check the status of the egress TCP connection like
>> for e.g.:
>> if(!tcp_conid_state(conid)) {
>>
>> Thanks.
>> --Sergiu
>>
>> _______________________________________________
>> Kamailio (SER) - Users Mailing Listsr-users at lists.kamailio.orghttps://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>>
>> --
>> Daniel-Constantin Mierla -- www.asipto.comwww.twitter.com/miconda -- www.linkedin.com/in/miconda
>> Funding: https://www.paypal.me/dcmierla
>>
>>
> _______________________________________________
> Kamailio (SER) - Users Mailing Listsr-users at lists.kamailio.orghttps://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>
> --
> Daniel-Constantin Mierla -- www.asipto.comwww.twitter.com/miconda -- www.linkedin.com/in/miconda
> Funding: https://www.paypal.me/dcmierla
>
>
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