How to check for presence of a file from a route? (Or any other way to tell kamailio not to accept new calls)
13 Nov
2023
13 Nov
'23
5:17 a.m.
Hi
I'm still looking for a better way to tell Kamailio that we want to
enter 'maintenance' and STAY in maintenance after a restart.
Maintenance is: Reject all messages without totag with 503 to prevent
creating new dialogues.
I could use a shared pv and the use kamcmd pv.shvSet to toggle it.
But when kamailio is restarted, that pv is also reset to it's initial
state. Not good, if I want to make sure the node stays in maintenance
mode after a restart as for example after pushing a config change via
ansible.
So what comes to my mind is to check for the presence of a file.
something like:
route[CHECK_MAINTENANCE]
{
if (!has_totag() && is_method("INVITE")) {
if (file_exist("/etc/kamailio/maintenance.flag")) {
xlog("L_ERR", "Maintenance flag present! Rejecting INVITE\n");
t_send_reply("503", "Maintenance mode - no new calls accepted");
exit;
}
}
}
Mit freundlichen Grüssen
-Benoît Panizzon-
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13 Nov
13 Nov
5:46 a.m.
On 13.11.23 11:17, Benoit Panizzon via sr-users wrote:
Hi
I'm still looking for a better way to tell Kamailio that we want to
enter 'maintenance' and STAY in maintenance after a restart.
Maintenance is: Reject all messages without totag with 503 to prevent
creating new dialogues.
I could use a shared pv and the use kamcmd pv.shvSet to toggle it.
But when kamailio is restarted, that pv is also reset to it's initial
state. Not good, if I want to make sure the node stays in maintenance
mode after a restart as for example after pushing a config change via
ansible.
So what comes to my mind is to check for the presence of a file.
something like:
route[CHECK_MAINTENANCE]
{
if (!has_totag() && is_method("INVITE")) {
if (file_exist("/etc/kamailio/maintenance.flag")) {
xlog("L_ERR", "Maintenance flag present! Rejecting INVITE\n");
t_send_reply("503", "Maintenance mode - no new calls accepted");
exit;
}
}
}
I would really avoid checking/reading a file for every new sip call,
especially on production system with decent volume of calls. But if
suits your needs and system, look at corex module, there is a function
to read the content of a file.
I would rather find a solution where the state is kept in memory, like
still using $shv(...) and change kamailio.cfg to init in maintenance
mode via pv parameter which can set $shv(...) at startup, or using
htable with database backend that loads at startup.
Cheers,
Daniel
--
Daniel-Constantin Mierla (@ asipto.com)
twitter.com/miconda -- linkedin.com/in/miconda
Kamailio Consultancy and Development Services
6:56 a.m.
Hello,
just to add another common method, you could also just use a cfg file variable that you
can modify later with kamcmd, kamcli etc.. There is a prepared variable (pstn..) in the
default cfg.
Cheers,
Henning
--
Henning Westerholt - https://skalatan.de/blog/
Kamailio services - https://gilawa.com
-----Original Message-----
From: Daniel-Constantin Mierla via sr-users <sr-users(a)lists.kamailio.org>
Sent: Montag, 13. November 2023 11:46
To: Kamailio (SER) - Users Mailing List <sr-users(a)lists.kamailio.org>
Cc: Daniel-Constantin Mierla <miconda(a)gmail.com>
Subject: [SR-Users] Re: How to check for presence of a file from a route? (Or
any other way to tell kamailio not to accept new calls)
On 13.11.23 11:17, Benoit Panizzon via sr-users wrote:
Hi
I'm still looking for a better way to tell Kamailio that we want to
enter 'maintenance' and STAY in maintenance after a restart.
Maintenance is: Reject all messages without totag with 503 to prevent
creating new dialogues.
I could use a shared pv and the use kamcmd pv.shvSet to toggle it.
But when kamailio is restarted, that pv is also reset to it's initial
state. Not good, if I want to make sure the node stays in maintenance
mode after a restart as for example after pushing a config change via
ansible.
So what comes to my mind is to check for the presence of a file.
something like:
route[CHECK_MAINTENANCE]
{
if (!has_totag() && is_method("INVITE")) {
if (file_exist("/etc/kamailio/maintenance.flag")) {
xlog("L_ERR", "Maintenance flag present! Rejecting
INVITE\n");
t_send_reply("503",
"Maintenance mode - no new
calls accepted");
exit;
}
}
}
I would really avoid checking/reading a file for every new sip call, especially on
production system with decent volume of calls. But if suits your needs and
system, look at corex module, there is a function to read the content of a file.
I would rather find a solution where the state is kept in memory, like still using
$shv(...) and change kamailio.cfg to init in maintenance mode via pv
parameter which can set $shv(...) at startup, or using htable with database
backend that loads at startup.
Cheers,
Daniel
--
Daniel-Constantin Mierla (@ asipto.com)
twitter.com/miconda -- linkedin.com/in/miconda Kamailio Consultancy and
Development Services
__________________________________________________________
Kamailio - Users Mailing List - Non Commercial Discussions To unsubscribe
send an email to sr-users-leave(a)lists.kamailio.org
Important: keep the mailing list in the recipients, do not reply only to the
sender!
Edit mailing list options or unsubscribe: 
9:48 a.m.
Or better yet use an htable
On Mon, 13 Nov 2023 at 13:31, Henning Westerholt via sr-users <
sr-users(a)lists.kamailio.org> wrote:
Hello,
just to add another common method, you could also just use a cfg file
variable that you can modify later with kamcmd, kamcli etc.. There is a
prepared variable (pstn..) in the default cfg.
Cheers,
Henning
--
Henning Westerholt - https://skalatan.de/blog/
Kamailio services - https://gilawa.com
-----Original Message-----
From: Daniel-Constantin Mierla via sr-users <sr-users(a)lists.kamailio.org
Sent: Montag, 13. November 2023 11:46
To: Kamailio (SER) - Users Mailing List <sr-users(a)lists.kamailio.org>
Cc: Daniel-Constantin Mierla <miconda(a)gmail.com>
Subject: [SR-Users] Re: How to check for presence of a file from a
route? (Or
any other way to tell kamailio not to accept new
calls)
On 13.11.23 11:17, Benoit Panizzon via sr-users wrote:
especially
on
Hi
I'm still looking for a better way to tell Kamailio that we want to
enter 'maintenance' and STAY in maintenance after a restart.
Maintenance is: Reject all messages without totag with 503 to prevent
creating new dialogues.
I could use a shared pv and the use kamcmd pv.shvSet to toggle it.
But when kamailio is restarted, that pv is also reset to it's initial
state. Not good, if I want to make sure the node stays in maintenance
mode after a restart as for example after pushing a config change via
ansible.
So what comes to my mind is to check for the presence of a file.
something like:
route[CHECK_MAINTENANCE]
{
if (!has_totag() && is_method("INVITE")) {
if (file_exist("/etc/kamailio/maintenance.flag")) {
xlog("L_ERR", "Maintenance flag present! Rejecting
INVITE\n");
t_send_reply("503",
"Maintenance mode - no new
calls accepted");
exit;
}
}
}
I would really avoid checking/reading a file for every new sip call, production system with decent volume of calls.
But if suits your needs
and
system, look at corex module, there is a function
to read the content of
a file.
I would rather find a solution where the state is kept in memory, like
still
using
$shv(...) and change kamailio.cfg to init in
maintenance mode via pv
parameter which can set $shv(...) at startup, or using htable with
database
backend that loads at startup.
Cheers,
Daniel
--
Daniel-Constantin Mierla (@ asipto.com)
twitter.com/miconda -- linkedin.com/in/miconda Kamailio Consultancy and
Development Services
__________________________________________________________
Kamailio - Users Mailing List - Non Commercial Discussions To unsubscribe
send an email to sr-users-leave(a)lists.kamailio.org
Important: keep the mailing list in the recipients, do not reply only to
the
sender!
Edit mailing list options or unsubscribe:
__________________________________________________________
Kamailio - Users Mailing List - Non Commercial Discussions
To unsubscribe send an email to sr-users-leave(a)lists.kamailio.org
Important: keep the mailing list in the recipients, do not reply only to
the sender!
Edit mailing list options or unsubscribe:
234
days inactive
234
days old
3 comments
4 participants
participants (4)
-
Benoit Panizzon -
Daniel-Constantin Mierla -
David Villasmil -
Henning Westerholt