[SR-Users] tcp_set_connection_lifetime(1) does not close connection

[Arsen Semenov]

Hello Sebastian,

Have you tried to use `set_reply_close()` instead ?

https://www.kamailio.org/wiki/cookbooks/5.5.x/core#set_reply_close

On Fri, Dec 10, 2021 at 8:49 PM Sebastian Damm <sdamm at pascom.net> wrote:

> Hi,
>
> for having a maintenance mode, I need to implement some sort of draining
> functionality. All our clients register via TLS. So I thought, I just
> answer the next REGISTER of a client with a 503 and kill the tcp connection
> afterwards, so they need to open up a new connection to the loadbalancer in
> front and end up on a different server.
>
> This is my code:
>
> 510         if msg.is_method("REGISTER"):
>   1             if KSR.pv.get("$shv(MAINTENANCE_MODE)") == 1:
>   2                 KSR.info("In maintenance mode, rejecting registration")
>   3                 KSR.hdr.append_to_reply("Retry-After: 2\r\n")
>   4                 KSR.sl.sl_send_reply(503, "Draining")
>   5                 if KSR.tcpops.tcp_set_connection_lifetime(1) > 0:
>   6                     KSR.info("Set Connection lifetime to 1")
>   7                 return False
>
> (Side note: msg is some internal class, this is obviously KEMI with python)
>
> So now when I set the MAINTENANCE_MODE var to 1, Kamailio rejects the
> REGISTER requests, logs both lines and sends out a 503.
>
> Debug log tells me this:
> Dec 10 15:32:10 ifens5 /usr/sbin/kamailio[3851]: DEBUG: tcpops
> [tcpops.c:229]: tcpops_set_connection_lifetime(): new connection lifetime
> for conid=1: 908866403
> Dec 10 15:32:21 ifens5 /usr/sbin/kamailio[3855]: DEBUG: <core>
> [core/tcp_main.c:4554]: tcpconn_main_timeout(): entering timer for
> 0x7f759cb26218 (ticks=908866499, timeout=908866499 (0 s), wr_timeout=0
> (211631299 s)), write queue: 0 bytes
>
> In tcpdump I can see that the connection does not get closed immediately.
>
> Is there some timer in the tcp stack which cleans up expired connections
> from time to time? Can I manipulate how often this timer runs? I couldn't
> find anything, and clearly even though I tell Kamailio to close the
> connection after 1 second, it doesn't do it.
>
>
> Thanks for any input.
>
> Regards,
> Sebastian
>
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-- 
Arsen Semenov
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