[SR-Users] Loop detected on aws setup
Klaus Darilion
klaus.mailinglists at pernau.at
Fri Oct 18 08:23:33 CEST 2013
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 not
call t_relay.
If you do not want to send a message to a certain destination, then set
$ru (the domain part) to the respective destination.
One issue may be the aliases. If Kamailio thinks that it is not
authoritative for a domain, then it forwards the message to the domain.
Kamailio by default feels authoritative for the IP addresses on which it
listens (the private IP addresses). Thus if a request is received by
Kamailio, but the RURI (request URI, $ru) indicated the public IP
address, KAmailio by default forwards the message to the respective 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 log
file how the message is processed, and where the routing decision takes
the wrong direction.
regards
Klaus
>
> same thing happens when a gw code is not found on the dispatcher list file.
>
> 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:pinger at kamailio.org
> <mailto:sip%3Apinger at 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 ("$var(z)", "4");#carrer dynamic
>
>
> ###########KILLING BUGGIES#######when t_realy fails to find a route a
> loop is generate then strip takes off a digit until 0 at 2.2.2.2
> <mailto:0 at 2.2.2.2> is left for to: user this kills that call.#####
> if ($(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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>
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