[Users] am I doing it right?

[Ohad.Levy at infineon.com]

Hi All,

I'm trying to setup a redundant environment with DNS SRV records, 2 (or
more) SIP registration servers, and Asterisk gateways.
Basically I've setup both OpenSER clients to t_replicate each other the
registration message if its coming from a client, and save it to the
database or to memory when its coming from the other OpenSER server.

However, every once in a while, I get message to big, and or duplicate
messages (WARNING: warning skipped -- too big, or ERROR:
warning_builder: buffer size exceeded, submit_query: Duplicate entry
,db_insert: Error while submitting query...)

While it seems to work in general, I was not sure that this is the
"right" way to do it.

I'm attaching my openser.cfg of one of the machines; the other is more
or less identical...
Thanks

# ----------- global configuration parameters ------------------------

debug=9            # debug level (cmd line: -dddddddddd)
fork=yes
log_stderror=no    # (cmd line: -E)

check_via=no	# (cmd. line: -v)
dns=no          # (cmd. line: -r)
listen=172.28.132.20
rev_dns=no      # (cmd. line: -R)
port=5060
children=4
fifo="/tmp/openser_fifo"
alias="mydomain.com"

# ------------------ module loading ----------------------------------

loadmodule "/usr/local/lib/openser/modules/mysql.so"
loadmodule "/usr/local/lib/openser/modules/sl.so"
loadmodule "/usr/local/lib/openser/modules/tm.so"
loadmodule "/usr/local/lib/openser/modules/rr.so"
loadmodule "/usr/local/lib/openser/modules/maxfwd.so"
loadmodule "/usr/local/lib/openser/modules/usrloc.so"
loadmodule "/usr/local/lib/openser/modules/registrar.so"
loadmodule "/usr/local/lib/openser/modules/textops.so"
loadmodule "/usr/local/lib/openser/modules/auth.so"
loadmodule "/usr/local/lib/openser/modules/auth_db.so"
loadmodule "/usr/local/lib/openser/modules/lcr.so"
loadmodule "/usr/local/lib/openser/modules/xlog.so"

# ----------------- setting module-specific parameters ---------------

modparam("usrloc", "db_mode", 2)
modparam("usrloc|lcr|auth_db|avpops|group","db_url","mysql://openser:ope
nserrw at voip-db.mydomain.com/openser")
modparam("auth_db", "calculate_ha1", yes) modparam("auth_db",
"password_column", "password")

modparam("rr", "enable_full_lr", 1)

# -------------------------  request routing logic -------------------

# main routing logic

route{

	# initial sanity checks -- messages with
	# max_forwards==0, or excessively long requests
	if (!mf_process_maxfwd_header("10")) {
		sl_send_reply("483","Too Many Hops");
		exit;
	};

	if (msg:len >=  2048 ) {
		sl_send_reply("513", "Message too big");
		exit;
	};

	# we record-route all messages -- to make sure that
	# subsequent messages will go through our proxy; that's
	# particularly good if upstream and downstream entities
	# use different transport protocol
	if (!method=="REGISTER")
		record_route();

	# subsequent messages withing a dialog should take the
	# path determined by record-routing
	if (loose_route()) {
		# mark routing logic in request
		append_hf("P-hint: rr-enforced\r\n"); 
		route(1);
	};

	if (!uri==myself) {
		route(1);
	};

	# Handle Request logic here
	if (uri==myself) {
		if (method=="REGISTER") {
			route(2);
			exit;
		}
		lookup("aliases");
		if (!uri==myself) {
			append_hf("P-hint: outbound alias\r\n"); 
			route(1);
		};

		if (!load_gws()) {
			sl_send_reply("500", "Server Internal Error -
Cannot load gateways");
			exit;
		};
		if (!next_gw()) {
                	sl_send_reply("503", "Service not available, no
gateways found");
	                log (1,"No more gateways");
        	} else {
                	log (1,"Found a gateway");
	        }
		if (!lookup("location")) {
			sl_send_reply("404", "Not Found");
			exit;
		};
		append_hf("P-hint: usrloc applied\r\n"); 
	};
	route(1);
}


route[1] {
	# send it out now; use stateful forwarding as it works reliably
	# even for UDP2TCP
	if (!t_relay()) {
		sl_reply_error();
	};
	exit;
}

route[2] {
	#handle all Registration here....
			if (search("^(Contact|m):
.*@(voip.mydomain.com)")){
			       log(1, "ALERT: someone trying to set
aor==server address\n");
			       sl_send_reply("476", "Server address in
contacts is not allowed" );
			       exit;
			 };

	# challenge/response
	#if a registration request is coming from another ser server, it
means that's it's already authenticated the user and wrote
	#an entry in the database, so lets just write it into our
memory.  
			if (src_ip==172.28.132.21) {
				save_memory("location");
				log(1, "Registered replicated user from
Proxy");
				exit;
			};
		# this is a new request, lets check that the user is
valid.
		        if (!www_authorize("mydomain.com",
"subscriber")) {
       				www_challenge("mydomain.com", "0");
				log(1, "Authentication challenge issued.
Waiting for reply.\n");
			        exit;
			};

        # Authentication successful, add entry to our Contact database
   			log(1, "Authentication challenge reply ok.\n");
			if (!save("location")) {
       				sl_reply_error();
			        log(1, "ALERT: Unable to save URI to
location database.\n");
			} else {
        # and replicate the request to the backup server
	        		if (!src_ip==172.28.132.21) {
			             log(1, "REPLICATE: Replicating
register request\n");
	
t_replicate("sip:172.28.132.21:5060");
			        };

			};
}