[sr-dev] [kamailio/kamailio] Kamailio-5.4.0 : Crashes from keepalive module (#2448)

[sagarmalam]

@miconda , Yes i am adding and removing on the fly. I am adding(using ka_add_destination) to KA list on successful registration and removing(using ka_del_destination) when registration expires.
```

#####################KEEPALIVE#######################################
modparam("keepalive", "ping_interval", 20)
modparam("keepalive", "delete_counter", 5)
modparam("keepalive", "ping_from", "sip:keepalive at fromsbc")

request_route {

##ON RECIEVING OPTIONS FROM KA MODULE ON 9090 PORT, Set $du using handle_ruri_alias , replace tp with transport and relay it to edge proxy from which we recieved register packet
                if ($Rp == "9090" && is_method("OPTIONS")){
                        if (t_newtran()) {
                                if (handle_ruri_alias()){
                                        $avp(request_uri)= $ru ;
                                        $avp(pb-ip)=$(avp(request_uri){param.value,pb-ip});
                                        if (is_ipv6($avp(pb-ip))) {
                                                if (subst_uri('/^sip:(.*)@(.*);pb-ip=(.*);pb-pt=(.*);tp=(.*)$/sip:\1@[\3]:\4;pb-ip=\3;pb-pt=\4;transport=\5/i')){
                                                          xlog("L_INFO","(KA OPTIONS) : ($avp(uuid)) : Destination URI <$du> created from alias.");
                                                         t_relay();
                                              }

                                        } else {
                                                if (subst_uri('/^sip:(.*)@(.*);pb-ip=(.*);pb-pt=(.*);tp=(.*)$/sip:\1@\3:\4;pb-ip=\3;pb-pt=\4;transport=\5/i')){
                                                          xlog("L_INFO","(KA OPTIONS) : ($avp(uuid)) : Destination URI <$du> created from alias.");
                                                         t_relay();
                                                }

                                        }

                                }

                                exit;
                        }

$du=sip:APPLICATION_SERVER_IP:5060; ##IP of application server ( Freeswitch) to which kamailio will relay register packet add_contact_alias();
t_on_reply("reply_register")
if (!t_relay()) {
                sl_reply_error();
        }
exit;
} 
onreply_route[reply_register ]{
 if ((status=~"200") && $rm=="REGISTER" && $(avp(c_ct){param.value,expires}) != 0)
        {
## On receiving fresh registration (i.e with expires !=0) , Kamailio will register a contact address for that registration in KA module ping registry.
        $avp(ka_contact) = 'sip:'+$fU+'@LOCAL_IP:9090;alias='+$(avp(c_ct){param.value,alias})+';pb-ip='+$(avp(c_ct){param.value,pb-ip})+';pb-pt='+$(avp(c_ct){param.value,pb-pt})+';tp='+$(avp(c_ct){param.value,transport}{s.rm,>});
        ka_add_destination("$avp(ka_contact)","config");
} 

if ((status=~"200") && $rm=="REGISTER" && $(avp(c_ct){param.value,expires}) == 0)
 {

        $avp(ka_contact) = 'sip:'+$fU+'@LOCAL_IP:9090;alias='+$(avp(c_ct){param.value,alias})+';pb-ip='+$(avp(c_ct){param.value,pb-ip})+';pb-pt='+$(avp(c_ct){param.value,pb-pt})+';tp='+$(avp(c_ct){param.value,transport}{s.rm,>});
        ka_del_destination("$avp(ka_contact)","config");
}

}
```

@NGSegovia , I am adding destinations from CFG file.



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