26 Oct
2010
26 Oct
'10
5:22 p.m.
On 10/26/2010 05:09 PM, Alex Balashov wrote:
Pike or ratelimit modules may facilitate this;
otherwise, no.
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On Oct 26, 2010, at 9:55 AM, "Nicolas Rüger"<NicolasRueger(a)gmx.de>
wrote:
> Hello,
>
> is there a mechanism to provoke a DELAY for certain incoming INVITES
> before passing them to the callee???
>
>
>
Hello, It is not a good design practice to do it synchronously, mainly
because the worker process will remain blocked for 30s . Imagine an
attacker sending 30 requests and DoS the whole server , because of the
limited number of worker process (not to mention that 30s delay means
retrasmits from the TM layer- so these need to be handled by tm before
the "sleep").
Anyway I wouldn't recommend a design like this. As others suggested
pike and ratelimite (mostly ratelimit) will allow you to drop calls from
attackers. You could add a Retry-After header so to inform a normal UA
to retry the request after a number of seconds.
Marius
Just the
single message needs to be delayed as the caller might be
suspicios. I do already have a list in database and can check the
caller against the list.
I do need something in routing logic to delay the current message
WITHOUT slowing down kamailio and kill performance.
something like in this pseudo_code:
route{
if (is_method("INVITE")&& !has_totag() ) {
if (user_delaylist == TRUE){
delay_message_for(30 sec.);
}
}
}
Any ideas and suggestions are appreciated!
Regards,
Nicolas
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