Re: [SR-Users] Loop detected on aws setup

Daniel-Constantin Mierla Fri, 18 Oct 2013 00:31:40 -0700

Hello,

for reference, in case kamailio is running behind nat, like on AWS, oneshould just use advertise directive for listen parameter, like:


listen=proto:privateip:port advertise publicip:port

See:

http://www.kamailio.org/wiki/cookbooks/4.0.x/core#listen

It simplifies the config by not needing to use alias parameter,advertised_address/set_addvertised_address() and record_route_preset().


Cheers,
Daniel

On 10/18/13 8:23 AM, Klaus Darilion wrote:



On 17.10.2013 17:31, julian arsanches wrote:

Hi all, before hand thanks for all the support received on this channel.

I have an issue with an installed server on a aws instance which is
giving me routing loops, my setup is simple, i have alias set for both
ips internal and external and the loop still present when t_relay don't
find any routes to relay it just sent it to  itself with the public ip
then the loop starts.

can any one please advise how can i prevent that or just tell t_relay
that if there is no more routes just respond with a cancel or stop
searching.

If you call t_relay, then the message will be forwarded to $ru (or to$du if $du is set). t_relay itself does not have any logic inside.

Thus, if you do not want a message to be forwarded, then you must notcall t_relay.

If you do not want to send a message to a certain destination, thenset $ru (the domain part) to the respective destination.

One issue may be the aliases. If Kamailio thinks that it is notauthoritative for a domain, then it forwards the message to thedomain. Kamailio by default feels authoritative for the IP addresseson which it listens (the private IP addresses). Thus if a request isreceived by Kamailio, but the RURI (request URI, $ru) indicated thepublic IP address, KAmailio by default forwards the message to therespective RURI (which my be forward again by AWS NAT to Kamailio).


Thus, alias=public.ip.addr.ess must be added to the config.

If there are still problems you have set debug=4 and track in the logfile how the message is processed, and where the routing decisiontakes the wrong direction.


regards
Klaus

same thing happens when a gw code is not found on the dispatcher listfile.


as i had read by just specifying the alias=domain it should take care of
it but it is not happening perhaps because it is a AWS instance, or most
likely i am missing something after the T_relay to stop the call from
looping.

I do have several headers fix because i have an asterisk sending calls
with lots of signalling calls added to the call that i need to remove
before the call is passed out to a carrier or another UA, Kamailio is
just proxing the calls between asterisk and the outside world no Media
handling, No registrations.

  Again thanks for any tips to find my answer or if anyone had a similar
issue thanks again.

thanks for any help .

Julian.

on this setup i have

public ip as 2.2.2.2

private IP as 1.1.1.1


#!KAMAILIO
####### Global Parameters #########

#!ifdef WITH_DEBUG
debug=4
log_stderror=yes
#!else
#debug=2
#log_stderror=yes
#!endif

memdbg=5
memlog=5

log_facility=LOG_LOCAL7

fork=yes
children=6

auto_aliases=no


listen=udp:1.1.1.1:5060 <http://1.1.1.1:5060> advertise 2.2.2.2:5060
<http://2.2.2.2:5060>

alias=1.1.1.1:5060 <http://1.1.1.1:5060>
alias=1.1.1.1
alias=2.2.2.2:5060 <http://2.2.2.2:5060>
alias=2.2.2.2


port=5060

enable_tls=no

#tcp_connection_lifetime=3605

#!ifdef WITH_SRCPATH
mpath="modules_k:modules"
#!else
mpath="/usr/lib64/kamailio/modules_k/:/usr/lib64/kamailio/modules/"

#!endif
loadmodule "db_mysql.so"
##loadmodule "mi_fifo.so"
loadmodule "tm.so"
loadmodule "sl.so"
loadmodule "acc.so"
loadmodule "rr.so"
loadmodule "maxfwd.so"
loadmodule "uac.so"
loadmodule "textops.so"
loadmodule "pv.so"
loadmodule "dispatcher.so"
loadmodule "usrloc.so"
loadmodule "registrar.so"
loadmodule "siputils.so"
loadmodule "sanity.so"
loadmodule "ctl.so"
loadmodule "mi_rpc.so"
loadmodule "avpops.so"
#!ifdef WITH_NAT
loadmodule "nathelper.so"
loadmodule "rtpproxy.so"
#!endif
loadmodule "xlog.so"
##mysqlcdr
modparam("acc", "db_flag", 2)
modparam("acc", "db_missed_flag", 3)
modparam("acc", "report_cancels", 1)
modparam("acc", "db_url", "mysql://openser:password@1.1.1.2/openser
<http://openser:password@1.1.1.2/openser>")
modparam("acc", "db_extra", "from_uri=$fu; to_uri=$tu; intid=$fU;
type_call=$si; dst_ip=$ru; carriercode=$tu;callmode=$var(out)" )

#loadmodule "carrierroute"
modparam("tm", "cancel_b_method", 1)
modparam("tm", "failure_reply_mode", 3)
modparam("tm", "fr_timer", 30000)
modparam("tm", "fr_inv_timer", 120000)

modparam("dispatcher", "list_file", "/etc/kamailio/dispatcher.lst")
modparam("rr", "enable_full_lr", 1)

#!ifdef WITH_NAT
# ----- rtpproxy params -----
modparam("rtpproxy", "rtpproxy_sock", "udp:127.0.0.1:7722
<http://127.0.0.1:7722>")

# ----- nathelper params -----
modparam("nathelper", "natping_interval", 30)
modparam("nathelper", "ping_nated_only", 1)
modparam("nathelper", "sipping_bflag", FLB_NATSIPPING)
modparam("nathelper", "sipping_from", "sip:pin...@kamailio.org
<mailto:sip%3apin...@kamailio.org>")
# ----- mi_fifo params -----

##modparam("mi_fifo", "fifo_name", "/tmp/kamailio_fifo")

# params needed for NAT traversal in other modules
modparam("nathelper|registrar", "received_avp", "$avp(RECEIVED)")
modparam("usrloc", "nat_bflag", FLB_NATB)
#!endif
modparam("xlog", "buf_size", 8192)
modparam("xlog", "force_color", 1)
#carrierroute

#modparam("carrierroute", "config_file","/etc/kamailio/carrierroute.conf")

#end carrierroute

modparam("pv", "shvset", "ruta=s:$ru")
modparam("pv", "varset","in=s:IN")
modparam("pv", "varset","out=s:OUT")
#################BEGINING MAINROUTE##################
request_route {

         if (!mf_process_maxfwd_header("4")) {
                 sl_send_reply("483","Too Many Hops");
drop;
                 exit;
         }
##
  # initial sanity checks -- too long messages
        if (msg:len >=  2048 ) {
                sl_send_reply("513", "Message too big");
xlog("out header CHECK 513 baderror from_uri=$fu;($ct++)<$tU---=$var(n)>
to_uri=$tu; intid=$fU; type_call=$si; dst_ip=$ru;
carriercode=$var(z);callmode=$var(out)");
drop;
                exit;
        };
#
         if(is_method("OPTIONS")) {
             # send reply for each options request
             sl_send_reply("200", "ok");
             exit();
          }



#
if ( is_method("ACK") ) {
if ( t_check_trans() ) {
# no loose-route, but stateful ACK;
# must be an ACK after a 487
# or e.g. 404 from upstream server
$var(n)=$(tU{s.substr,3,0});
$var(i)=$(ct{re.subst,/^.*11811(.*)/"\1/});

$var(t)=$(fn{re.subst,/^.*11811(.*)/"\1/});

$var(r)=$rd; ##to domain
$fU=$(fU{s.substr,14,0});
$fn=$var(t);
$tU=$var(n);
$td=$var(r);

subst('/^Contact:.*11811(.*)$/Contact: <sip:\1\2/ig');

# Remove prefixes numbers from Contact\
t_relay();
exit;
} else {
# ACK without matching transaction ... ignore and discard
$var(n)=$(tU{s.substr,3,0});
$var(i)=$(ct{re.subst,/^.*11811(.*)/"\1/});

$var(t)=$(fn{re.subst,/^.*11811(.*)/"\1/});

$var(r)=$rd; ##to domain
$fU=$(fU{s.substr,14,0});
$fn=$var(t);
$tU=$var(n);
$td=$var(r);

subst('/^Contact:.*11811(.*)$/Contact: <sip:\1\2/ig');
t_relay();
exit;
}
}
##responding to bye requests and modifying headers to match invite
    if(method=="BYE") {
    #Account BYE transactions
#$var(d) = $tu;
#$var(e)=$(var(d){s.substr,4,3});
setflag(2);
setflag(10);
$var(n)=$(tU{s.substr,3,0});
$var(i)=$(ct{re.subst,/^.*11811(.*)/"\1/});

$var(t)=$(fn{re.subst,/^.*11811(.*)/"\1/});

$var(r)=$rd; ##to domain
$fU=$(fU{s.substr,14,0});
$fn=$var(t);
$tU=$var(n);
$td=$var(r);

subst('/^Contact:.*11811(.*)$/Contact: <sip:\1\2/ig');
t_relay();
         exit;
};

#CANCEL processing
if (method=="CANCEL") {
setflag(2);
setflag(3);
$var(n)=$(tU{s.substr,3,0});
$var(i)=$(ct{re.subst,/^.*11811(.*)/"\1/});

$var(t)=$(fn{re.subst,/^.*11811(.*)/"\1/});

$var(r)=$rd; ##to domain
$fU=$(fU{s.substr,14,0});
$fn=$var(t);
$tU=$var(n);
$td=$var(r);

subst('/^Contact:.*11811(.*)$/Contact: <sip:\1\2/ig');
t_relay();
         exit;
##if (t_check_trans()) t_relay();

exit;
};


#


#
        if (loose_route()) {


##
if(is_method("OPTIONS")) {
             # send reply for each options request
             sl_send_reply("200", "ok");
             exit();
          }
##
if(method=="BYE") {
    #Account BYE transactions
setflag(2);
};


##CANCEL processing
if (method=="CANCEL") {
setflag(3);
$var(n)=$(tU{s.substr,3,0});
$var(i)=$(ct{re.subst,/^.*11811(.*)/"\1/});

$var(t)=$(fn{re.subst,/^.*11811(.*)/"\1/});

$var(r)=$rd; ##to domain
$fU=$(fU{s.substr,14,0});
$fn=$var(t);
$tU=$var(n);
$td=$var(r);
subst('/^Contact:.*11811(.*)$/Contact: <sip:\1\2/ig');
if (t_check_trans()) t_relay();
exit;
};

if (!t_relay()) {
                         sl_reply_error();
                 }
                 exit;
        }


  if (is_method("INVITE")) { #Procesing invites


record_route();
         }
##LOGGING CALL BEFORE IS PROCESSED
xlog("before strip,< time [$Tf] > Aip= $src_ip, r-uri($ru\n");
xlog("before from_uri=$fu; to_uri=$tu; pai=<<$ct>>;intid=$fU;

type_call=$si; dst_ip=$ru; carriercode=$tu;callmode=$var(out)--$$--$ou");

#creando rutas
setflag(2);
# Account Missed calls
setflag(3);
###VARIABLES FOR MODIFICATIONS
$var(x) = $(ru);

$var(y)=$(var(x){s.substr,4,3});

$var(z)=$(var(y){s.int <http://s.int>});

$var(t)=$(var(x){s.substr,7,0});

$var(h)=$(var(x){s.substr,0,7});

$var(o)=$(fU{s.substr,14,0});

if($(var(x){s.len}) < 3)
{
  $var(z)='0'+ $var(z);
}

xlog("dsroute $var(z)fullruri($ru)\n");


strip(3);

xlog("after strip time [$Tf] method ($rm) via el code
($var(z)--varhex($var(h))-- ($var(y))\n");
xlog("after from_uri=$fu; to_uri=$tu; intid=$fU; type_call=$si;
dst_ip=$ru; carriercode=$var(z);callmode=$var(out)");

ds_select_domain ("$var(z)", "4");#carrer dynamic


###########KILLING BUGGIES#######when t_realy fails to find a route a
loop is generate then strip takes off a digit until 0@2.2.2.2
<mailto:0@2.2.2.2> is left for to: user this kills that call.#####
if ($(tU{s.len}) < 4) {
xlog("CHECK TU 1bad kILLING BUGGIES>>> $tu--$td-$tU-$tt--$dd-$dd-$du-
-<<$rd>$ru --- $oU> pai+++ <<$ct>>++ from_uri=$fu;<$tU---=$var(n)>
to_uri=$tu; }pai<$ai> id=$fU; type_call=$si; dst_ip=$ru;
carriercode=$var(z);callmode=$var(out)");
##sl_reply_error();
##sl_send_reply("513", "Message too big");
##sl_send_reply("488","Not Acceptable Here");
sl_send_reply("488","Not Acceptable Here");
#t_reset_retr();
#t_release();
##if(!t_relay()){ sl_reply_error(); drop; exit;}

#if (!t_relay()) { sl_reply_error(); break; };
# t_relay();
#setflag(2);
drop;
exit;

}; ## Endif less than 4
##############END KILLING###########
################ROUTE SELECTION###############
if($(fn{s.len}) > 10) { # IF WE CHECK FOR FROM: ROUTEID MUST BE LONGER
THAN 10 DIGITS TO BE A VALID ROUTE

xlog("out header CHECK more than 10 digits BEFORE
from_uri=$fu;($ct++)<$tU---=$var(n)> to_uri=$tu; intid=$fU;
type_call=$si; dst_ip=$ru; carriercode=$var(z);callmode=$var(out)");
$var(n)=$(tU{s.substr,3,0});
$var(i)=$(ct{re.subst,/^.*00700(.*)/"\1/});
$var(t)=$(fn{re.subst,/^.*00700(.*)/"\1/});
$var(r)=$rd; ##to domain
$fU=$(fU{s.substr,14,0});
$fn=$var(t);
$tU=$var(n);
$td=$var(r);

subst('/^Contact:.*11811(.*)$/Contact: <sip:\1\2/ig'); # Remove number
from Contact

##if(!t_relay()){ sl_reply_error(); drop; exit;}

if (!t_relay()) { sl_reply_error(); break; };

# t_relay();

drop;
  exit;

};

################ENDrouteselect##############################


###############AFTER LAST IF##############reply 488 ANY CALL THAT DID
NOT FOUND A ROUTE.
sl_send_reply("488","Not Acceptable Here");
drop;
exit;
}

###################END MAINROUTE#################





On My dispatcher.lst i have


1 sip:1.1.1.1:5060 <http://1.1.1.1:5060>
2 sip:2.2.2.2:5060 <http://2.2.2.2:5060>
3 sip:3.3.3.3:5060 <http://3.3.3.3:5060>
3 sip:3.3.3.5:5060 <http://3.3.3.5:5060>
...




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--
Daniel-Constantin Mierla - http://www.asipto.com
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Kamailio Advanced Trainings - Berlin, Nov 25-28; Miami, Nov 18-20, 2013
  - more details about Kamailio trainings at http://www.asipto.com -


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Re: [SR-Users] Loop detected on aws setup

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