[OpenSIPS-Users] 404 automatic failover

Pacho Baratta [fabbricadigitale] P.Baratta at fabbricadigitale.it
Mon Oct 12 18:03:58 CEST 2009


As I said, I'm really a newbie. So I tried to modify the default routing logic, but no success.
Can you please tell me what's wrong with this?
Thanks all, pacho



####### Routing Logic ########


# main request routing logic

route{

        if (!mf_process_maxfwd_header("10")) {
                sl_send_reply("483","Too Many Hops");
                exit;
        }

        if (has_totag()) {
                # sequential request withing a dialog should
                # take the path determined by record-routing
                if (loose_route()) {
                        if (is_method("BYE")) {
                                setflag(1); # do accounting ...
                                setflag(3); # ... even if the transaction fails
                        } else if (is_method("INVITE")) {
                                # even if in most of the cases is useless, do RR for
                                # re-INVITEs alos, as some buggy clients do change route set
                                # during the dialog.
                                record_route();
                        }
                        # route it out to whatever destination was set by loose_route()
                        # in $du (destination URI).
                        route(1);
                } else {
                        /* uncomment the following lines if you want to enable presence */
                        ##if (is_method("SUBSCRIBE") && $rd == "your.server.ip.address") {
                        ##      # in-dialog subscribe requests
                        ##      route(2);
                        ##      exit;
                        ##}
                        if ( is_method("ACK") ) {
                                if ( t_check_trans() ) {
                                        # non loose-route, but stateful ACK; must be an ACK after
                                        # a 487 or e.g. 404 from upstream server
                                        t_relay();
                                        exit;
                                } else {
                                        # ACK without matching transaction ->
                                        # ignore and discard
                                        exit;
                                }
                        }
                        sl_send_reply("404","Not here");
                }
                exit;
 }

        #initial requests

        # CANCEL processing
        if (is_method("CANCEL"))
        {
                if (t_check_trans())
                        t_relay();
                exit;
        }

        t_check_trans();

        # authenticate if from local subscriber (uncomment to enable auth)
        # authenticate all initial non-REGISTER request that pretend to be
        # generated by local subscriber (domain from FROM URI is local)
        ##if (!(method=="REGISTER") && from_uri==myself) /*no multidomain version*/
        ##if (!(method=="REGISTER") && is_from_local())  /*multidomain version*/
        ##{
        ##      if (!proxy_authorize("", "subscriber")) {
        ##              proxy_challenge("", "0");
        ##              exit;
        ##      }
        ##      if (!check_from()) {
        ##              sl_send_reply("403","Forbidden auth ID");
        ##              exit;
        ##      }
        ##
        ##      consume_credentials();
        ##      # caller authenticated
        ##}

        # preloaded route checking
        if (loose_route()) {
                xlog("L_ERR",
                "Attempt to route with preloaded Route's [$fu/$tu/$ru/$ci]");
                if (!is_method("ACK"))
                        sl_send_reply("403","Preload Route denied");
                exit;
        }

        # record routing
        if (!is_method("REGISTER|MESSAGE"))
                record_route();

        # account only INVITEs
        if (is_method("INVITE")) {
#######################################
if(uri=~"^sip:*@*") {
rewritehostport("172.30.1.110:5060");
 }
######################################

                setflag(1); # do accounting
        }
        if (!uri==myself)
        ## replace with following line if multi-domain support is used
        ##if (!is_uri_host_local())
        {
                append_hf("P-hint: outbound\r\n");
                # if you have some interdomain connections via TLS
                ##if($rd=="tls_domain1.net") {
                ##      t_relay("tls:domain1.net");
                ##      exit;
                ##} else if($rd=="tls_domain2.net") {
                ##      t_relay("tls:domain2.net");
                ##      exit;
                ##}
                route(1);
        }

        # requests for my domain

        ## uncomment this if you want to enable presence server
        ##   and comment the next 'if' block
        ##   NOTE: uncomment also the definition of route[2] from  below
        ##if( is_method("PUBLISH|SUBSCRIBE"))
        ##              route(2);

        if (is_method("PUBLISH"))
        {
                sl_send_reply("503", "Service Unavailable");
                exit;
        }


        if (is_method("REGISTER"))
        {
                # authenticate the REGISTER requests (uncomment to enable auth)
                ##if (!www_authorize("", "subscriber"))
                ##{
                ##      www_challenge("", "0");
                ##      exit;
                ##}
                ##
                ##if (!check_to())
                ##{
                ##      sl_send_reply("403","Forbidden auth ID");
                ##      exit;
##}
                ##
                ##if (!check_to())
                ##{
                ##      sl_send_reply("403","Forbidden auth ID");
                ##      exit;
                ##}

                if (!save("location"))
                        sl_reply_error();

                exit;
        }

        if ($rU==NULL) {
                # request with no Username in RURI
                sl_send_reply("484","Address Incomplete");
                exit;
        }

        # apply DB based aliases (uncomment to enable)
        ##alias_db_lookup("dbaliases");

        if (!lookup("location")) {
                switch ($retcode) {
                        case -1:
                        case -3:
                                t_newtran();
                                t_reply("404", "Not Found");
                                exit;
                        case -2:
                                sl_send_reply("405", "Method Not Allowed");
                                exit;
                }
        }

        # when routing via usrloc, log the missed calls also
        setflag(2);

        route(1);
}


route[1] {
        # for INVITEs enable some additional helper routes
        if (is_method("INVITE")) {
                t_on_branch("2");
                t_on_reply("2");
                t_on_failure("1");
        }
 if (!t_relay()) {
                sl_reply_error();
        };
        exit;
}


# Presence route
/* uncomment the whole following route for enabling presence
   NOTE: do not forget to enable the call of this route from the main
     route */
##route[2]
##{
##      if (!t_newtran())
##      {
##              sl_reply_error();
##              exit;
##      };
##
##      if(is_method("PUBLISH"))
##      {
##              handle_publish();
##              t_release();
##      }
##      else
##      if( is_method("SUBSCRIBE"))
##      {
##              handle_subscribe();
##              t_release();
##      }
##
##      exit;
##}


branch_route[2] {
        xlog("new branch at $ru\n");
}


onreply_route[2] {
        xlog("incoming reply\n");
}


failure_route[1] {
        if (t_was_cancelled()) {
                exit;
        }


        # uncomment the following lines if you want to block client
        # redirect based on 3xx replies.
        ##if (t_check_status("3[0-9][0-9]")) {
        ##t_reply("404","Not found");
        ##      exit;
        ##}

        # uncomment the following lines if you want to redirect the failed
        # calls to a different new destination
if (t_check_status("400|486|408")) {
                sethostport("172.30.7.54:5060");
        ##      # do not set the missed call flag again
 xlog("L_ERR",
                "Attempt to route with preloaded Route's [$fu/$tu/$ru/$ci]");

#               t_relay();
        }
}

fabbricadigitale srl
Pacho Baratta | Senior Systems Engineer
Tecnhology Engineering
-----------------------------
Via A.Volta, 3 - 26041 - Casalmaggiore - CR
Phone +39 0375 284600
Fax +39 02 57760002
mailto:p.baratta at fabbricadigitale.it
www.fabbricadigitale.it<http://www.fabbricadigitale.it/>

From: users-bounces at lists.opensips.org [mailto:users-bounces at lists.opensips.org] On Behalf Of Brett Nemeroff
Sent: lunedì 12 ottobre 2009 17:13
To: OpenSIPS users mailling list
Subject: Re: [OpenSIPS-Users] 404 automatic failover

This is not the right way to do it.

just set the initial hostport, then arm the failure route:
t_on_failure("1");

then t_relay() like normal.

Then setup a failure route:
failure_route[1] {

}

and perform your t_check_status and rewrite etc in there (perform a second rewritehostport) then t_relay again..

This is pretty basic scripting stuff.. I'd encourage you to go over the examples.

-Brett


On Mon, Oct 12, 2009 at 10:03 AM, Pacho Baratta [fabbricadigitale] <P.Baratta at fabbricadigitale.it<mailto:P.Baratta at fabbricadigitale.it>> wrote:

Hi all, i need some help with an issue. i'm quite a newbie, so be patien, please. i need to redirect all calss to a different gateway when the 1st returns a sip404.
my route is like this: if (is_method("INVITE")) {
if(uri=~"^sip:@") {
rewritehostport("172.30.1.110:5060<http://172.30.1.110:5060>");
#
if (tcheckstatus("404")) { sethostport("192.168.2.100:5060<http://192.168.2.100:5060>");
          t_relay();
    }
#
route(1);
}
but this doesn't seem to work.
can yoi suggest me the right way to do it?
thanks, Pacho


fabbricadigitale srl
Pacho Baratta | Senior Systems Engineer
Tecnhology Engineering
-----------------------------
Via A.Volta, 3 - 26041 - Casalmaggiore - CR
Phone +39 0375 284600
Fax +39 02 57760002
mailto:p.baratta at fabbricadigitale.it
www.fabbricadigitale.it<http://www.fabbricadigitale.it/>


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