[Serusers] nathelper

[Klaus Darilion]

yes.

Dinesh wrote:

> I am using Flag 6 to indicate behind NAT however when I look in the
> mysql - ser -location - flags field shows a 1 in that column and not a 6
> is this as it should be?
> 
> My ser.cfg is below.
> 
> Thanks,
> Dinesh
> 
> 
> fork=yes
> log_stderror=no	# (cmd line: -E)
> check_via=no	# (cmd. line: -v)
> dns=no           # (cmd. line: -r)
> rev_dns=no      # (cmd. line: -R)
> port=5060
> children=4
> fifo="/tmp/ser_fifo"
> 
> # ------------------ module loading ----------------------------------
> 
> # Uncomment this if you want to use SQL database
> loadmodule "/usr/local/lib/ser/modules/mysql.so"
> loadmodule "/usr/local/lib/ser/modules/nathelper.so"
> loadmodule "/usr/local/lib/ser/modules/sl.so"
> loadmodule "/usr/local/lib/ser/modules/tm.so"
> loadmodule "/usr/local/lib/ser/modules/rr.so"
> loadmodule "/usr/local/lib/ser/modules/maxfwd.so"
> loadmodule "/usr/local/lib/ser/modules/usrloc.so"
> loadmodule "/usr/local/lib/ser/modules/registrar.so"
> loadmodule "/usr/local/lib/ser/modules/textops.so"
> 
> # Uncomment this if you want digest authentication
> # mysql.so must be loaded !
> #loadmodule "/usr/local/lib/ser/modules/auth.so"
> #loadmodule "/usr/local/lib/ser/modules/auth_db.so"
> 
> # ----------------- setting module-specific parameters ---------------
> 
> # -- usrloc params --
> 
> #modparam("usrloc", "db_mode",   0)
> 
> # Uncomment this if you want to use SQL database 
> # for persistent storage and comment the previous line
> # No Cache
> #modparam("usrloc", "db_mode", 1)
> # With Cache
> modparam("usrloc", "db_mode", 2)
> 
> # -- auth params --
> # Uncomment if you are using auth module
> #
> #modparam("auth_db", "calculate_ha1", yes)
> #
> # If you set "calculate_ha1" parameter to yes (which true in this
> config), 
> # uncomment also the following parameter)
> #
> #modparam("auth_db", "password_column", "password")
> 
> # -- rr params --
> # add value to ;lr param to make some broken UAs happy
> modparam("rr", "enable_full_lr", 1)
> 
> #  Nathelper
> modparam("registrar", "nat_flag", 6)
> modparam("nathelper", "natping_interval", 30) # Ping interval 30 s
> modparam("nathelper", "ping_nated_only", 1)   # Ping only clients behind
> NAT
> 
> # -------------------------  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");
> 		break;
> 	};
> 	if (msg:len >=  max_len ) {
> 		sl_send_reply("513", "Message too big");
> 		break;
> 	};
> 
>      # !! Nathelper
> 	# Special handling for NATed clients; first, NAT test is
> 	# executed: it looks for via!=received and RFC1918 addresses
> 	# in Contact (may fail if line-folding is used); also,
> 	# the received test should, if completed, should check all
> 	# vias for rpesence of received
> 	if (nat_uac_test("2")) {
> 		# Allow RR-ed requests, as these may indicate that
> 		# a NAT-enabled proxy takes care of it; unless it is
> 		# a REGISTER
> 
> 		if (method == "REGISTER" || ! search("^Record-Route:"))
> {
> 		    log("LOG: Someone trying to register from private
> IP, rewriting\n");
> 		    fix_nated_contact(); # Rewrite contact with source
> IP of signalling
> 		    if (method == "INVITE") {
> 		        fix_nated_sdp("1"); # Add direction=active to
> SDP
> 		    };
> 		    force_rport(); # Add rport parameter to topmost Via
> 		    setflag(6);    # Mark as NATed
> 		};
> 	};
> 
> 
> 	# 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);
> 		break;
> 	};
> 
> 	if (!uri==myself) {
> 		# mark routing logic in request
> 		append_hf("P-hint: outbound\r\n"); 
> 		route(1);
> 		break;
> 	};
> 
> 
> 	if (uri==myself) {
> 		if (method=="INVITE") {
> 			record_route();
> 			if (isflagset(6)) {
> 				force_rtp_proxy();
> 			};
>      	};
> 
> 
> 		if (method=="REGISTER") {
> 			save("location");
> 			break;
> 		};
> 
> 		lookup("aliases");
> 		if (!uri==myself) {
> 			append_hf("P-hint: outbound alias\r\n"); 
> 			route(1);
> 			break;
> 		};
> 
> 
> 		# native SIP destinations are handled using our USRLOC
> DB
> 		if (!lookup("location")) {
> 			sl_send_reply("404", "Not Found");
> 			break;
> 		};
> 	};
> 	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();
> 	};
> }
> 
> onreply_route[1] {
>     # NATed transaction ?
>     if (isflagset(6) && status =~ "(183)|2[0-9][0-9]") {
>         fix_nated_contact();
> 	force_rtp_proxy();
>     # otherwise, is it a transaction behind a NAT and we did not
>     # know at time of request processing ? (RFC1918 contacts)
>     } else if (nat_uac_test("1")) {
>         fix_nated_contact();
>     };
> }
> 
> 
> 
> 
>  
> 
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