[Serusers] problem with NAT and mhomd SER and RTP proxy
Andrei Pelinescu-Onciul
pelinescu-onciul at fokus.fraunhofer.de
Thu Sep 23 09:24:44 CEST 2004
On Sep 22, 2004 at 11:21, Shi Hoch <shi at i-p-hi.com> wrote:
> the problem is that only one side is heard during the conversation.
> Now viewing the capture of SIP session i can see that the NATed client's SDP and Contact header were changed correctly
> but still the RTP proxy is listening for data from 192.168.10.14 instead of data from the NAT ip.
> attached the output of RTP proxy during debug mode the ser.cfg file please help!!!
A quick guess:
force_rtp_proxy("FA"); in the reply route (you should use A only for
un-natted clients, the effect of A is that the SDP address is trusted).
Andrei
> RTP proxy was started with the command:
> rtpproxy -2f -l 192.168.10.62/80.178.94.82
>
> RTP proxy Output:
>
> rtpproxy: rtpproxy started, pid 23524
> rtpproxy: new session 227142944229442YbiJ-400--500 at 192.168.10.14, tag 1c-2023537854 requested
> rtpproxy: new session on a port 64900 created, tag 1c-2023537854
> rtpproxy: pre-filling caller's address with 192.168.10.14:8000
> *Remark client 192.168.10.14 is behind a NAT
> rtpproxy: lookup on a ports 64900/64900, session timer restarted
> rtpproxy: pre-filling callee's address with 192.168.10.12:8000
> rtpproxy: session timeout
> rtpproxy: RTP stats: 330 in from callee, 0 in from caller, 330 relayed, 0 dropped
> rtpproxy: RTCP stats: 2 in from callee, 0 in from caller, 2 relayed, 0 dropped
> rtpproxy: session on ports 64900/64900 is cleaned up
>
> SER.cfg :
>
> #
> #
> #
>
> # ----------- global configuration parameters ------------------------
>
> /*
> debug=3 # debug level (cmd line: -dddddddddd)
> fork=yes
> log_stderror=no # (cmd line: -E)
> */
>
> #Uncomment these lines to enter debugging mode
> /*debug=7
> fork=yes
> log_stderror=yes
> */
>
> 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"
>
> listen=192.168.10.62
> listen=80.178.94.82
> mhomed=yes
>
> # ------------------ module loading ----------------------------------
>
> # Uncomment this if you want to use SQL database
> loadmodule "/lib/ser/modules/mysql.so"
>
> loadmodule "/lib/ser/modules/sl.so"
> loadmodule "/lib/ser/modules/tm.so"
> loadmodule "/lib/ser/modules/rr.so"
> loadmodule "/lib/ser/modules/maxfwd.so"
> loadmodule "/lib/ser/modules/usrloc.so"
> loadmodule "/lib/ser/modules/registrar.so"
> loadmodule "/lib/ser/modules/textops.so"
>
> # Uncomment this if you want digest authentication
> # mysql.so must be loaded !
> loadmodule "/lib/ser/modules/auth.so"
> loadmodule "/lib/ser/modules/auth_db.so"
>
> # !! Nathelper
> loadmodule "/lib/ser/modules/nathelper.so"
>
> # EXEC module
> #loadmodule "/lib/ser/modules/exec.so"
> # ----------------- setting module-specific parameters ---------------
>
> # -- usrloc params --
>
> modparam("usrloc", "db_url", "mysql://ser:******@localhost/ser")
>
> modparam("usrloc", "db_mode", 1)
>
> # Uncomment this if you want to use SQL database
> # for persistent storage and comment the previous line
> #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", 10) # Ping interval 30 s
> modparam("nathelper", "ping_nated_only", 1) # Ping only clients behind NAT
> modparam("nathelper", "rtpproxy_sock", "/var/run/rtpproxy.sock") #rtp proxy socket
> # ------------------------- 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;
> };
>
> if (method !="REGISTER" && !proxy_authorize("", "subscriber")){
> proxy_challenge("", "0");
> break;
> };
>
> if (method == "BYE" || method == "CANCEL")
> unforce_rtp_proxy();
>
> # !! 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("3") && dst_ip == 80.178.94.82) {
> sl_send_reply("", "Client is behind NAT");
> # 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");
>
> # This will work only for user agents that support symmetric
> # communication. We tested quite many of them and majority is
> # smart enough to be symmetric. In some phones it takes a configuration
> # option. With Cisco 7960, it is called NAT_Enable=Yes, with kphone it is
> # called "symmetric media" and "symmetric signalling".
>
> fix_nated_contact(); # Rewrite contact with source IP of signalling
> if (method == "INVITE") {
> sl_send_reply("", "Client is behind NAT And Requested a call");
> if (fix_nated_sdp("1")) sl_send_reply("", "Client SDP Replaced"); # 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()) {
> sl_send_reply("", "loose route");
> # mark routing logic in request
> append_hf("P-hint: rr-enforced\r\n");
> route(1);
> break;
> };
>
> if (!uri==myself) {
> sl_send_reply("", "outbound");
> # mark routing logic in request
> append_hf("P-hint: outbound\r\n");
> route(1);
> break;
> };
>
> # if the request is for other domain use UsrLoc
> # (in case, it does not work, use the following command
> # with proper names and addresses in it)
> if (uri==myself) {
>
> if (method=="REGISTER") {
>
> # Uncomment this if you want to use digest authentication
> if (!www_authorize("", "subscriber")) {
> www_challenge("", "0");
> break;
> };
>
> if (dst_ip == 192.168.10.62){
> save("secure_loc");
> } else {
> if (dst_ip == 80.178.94.82){
> save("net_loc");
> } else {
> sl_send_reply("403", "Call cannot be served here");
> };
> };
> break;
> };
>
> lookup("aliases");
> if (!uri==myself) {
> sl_send_reply("", "aliases outbound");
> append_hf("P-hint: outbound alias\r\n");
> route(1);
> break;
> };
>
> # native SIP destinations are handled using our USRLOC DB
> if (method == "INVITE") {
> # exec_msg("env > /root/sip_call_env ");
> if (lookup("secure_loc")) {
> sl_send_reply("","secure loc");
> if (dst_ip == 192.168.10.62){
> sl_send_reply("","192.168.10.62");
> if (force_rtp_proxy("FAII"))
> t_on_reply("1");
> };
> if (dst_ip == 80.178.94.82){
> sl_send_reply("","80.178.94.82");
> if (force_rtp_proxy("FAEI"))
> t_on_reply("1");
> };
> } else if (lookup("net_loc")) {
> sl_send_reply("","net loc");
> if (dst_ip == 192.168.10.62){
> sl_send_reply("","192.168.10.62");
> if (force_rtp_proxy("FAIE")){
> t_on_reply("1");
> sl_send_reply("","FAEI");
> };
> };
> if (dst_ip == 80.178.94.82){
> sl_send_reply("","80.178.94.82");
> if (force_rtp_proxy("FAEE"))
> t_on_reply("1");
> };
> } else {
> sl_send_reply("403", "Call cannot be served here");
> 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
> t_on_reply("1");
> if (!t_relay()) {
> sl_reply_error();
> };
> }
>
>
> onreply_route[1] {
> if (dst_ip == 80.178.94.82 && nat_uac_test("1")) {
> fix_nated_contact();
> if (status =~ "(183)|2[0-9][0-9]") fix_nated_sdp("1");
> };
>
> if (status =~ "(183)|2[0-9][0-9]") force_rtp_proxy("FA");
> }
>
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