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228 lines
6.5 KiB
228 lines
6.5 KiB
#
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# $Id$
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#
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# simple quick-start config script including nathelper support
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# This default script includes nathelper support. To make it work
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# you will also have to install Maxim's RTP proxy. The proxy is enforced
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# if one of the parties is behind a NAT.
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#
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# If you have an endpoing in the public internet which is known to
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# support symmetric RTP (Cisco PSTN gateway or voicemail, for example),
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# then you don't have to force RTP proxy. If you don't want to enforce
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# RTP proxy for some destinations than simply use t_relay() instead of
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# route(1)
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#
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# Sections marked with !! Nathelper contain modifications for nathelper
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#
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# NOTE !! This config is EXPERIMENTAL !
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#
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# ----------- global configuration parameters ------------------------
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debug=3 # debug level (cmd line: -dddddddddd)
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fork=yes
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log_stderror=no # (cmd line: -E)
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/* Uncomment these lines to enter debugging mode
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fork=no
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log_stderror=yes
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*/
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check_via=no # (cmd. line: -v)
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dns=no # (cmd. line: -r)
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rev_dns=no # (cmd. line: -R)
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port=5060
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children=4
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fifo="/tmp/sip-router_fifo"
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# ------------------ module loading ----------------------------------
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# Uncomment this if you want to use SQL database
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#loadmodule "/usr/local/lib/sip-router/modules/mysql.so"
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loadmodule "/usr/local/lib/sip-router/modules/sl.so"
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loadmodule "/usr/local/lib/sip-router/modules/tm.so"
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loadmodule "/usr/local/lib/sip-router/modules/rr.so"
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loadmodule "/usr/local/lib/sip-router/modules/maxfwd.so"
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loadmodule "/usr/local/lib/sip-router/modules/usrloc.so"
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loadmodule "/usr/local/lib/sip-router/modules/registrar.so"
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loadmodule "/usr/local/lib/sip-router/modules/textops.so"
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# Uncomment this if you want digest authentication
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# mysql.so must be loaded !
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#loadmodule "/usr/local/lib/sip-router/modules/auth.so"
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#loadmodule "/usr/local/lib/sip-router/modules/auth_db.so"
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# !! Nathelper
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loadmodule "/usr/local/lib/sip-router/modules/nathelper.so"
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# ----------------- setting module-specific parameters ---------------
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# -- usrloc params --
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modparam("usrloc", "db_mode", 0)
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# Uncomment this if you want to use SQL database
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# for persistent storage and comment the previous line
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#modparam("usrloc", "db_mode", 2)
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# -- auth params --
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# Uncomment if you are using auth module
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#
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#modparam("auth_db", "calculate_ha1", yes)
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#
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# If you set "calculate_ha1" parameter to yes (which true in this config),
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# uncomment also the following parameter)
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#
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#modparam("auth_db", "plain_password_column", "password")
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# -- rr params --
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# add value to ;lr param to make some broken UAs happy
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modparam("rr", "enable_full_lr", 1)
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# !! Nathelper
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modparam("registrar", "nat_flag", 6)
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modparam("nathelper", "natping_interval", 30) # Ping interval 30 s
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modparam("nathelper", "ping_nated_only", 1) # Ping only clients behind NAT
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# ------------------------- request routing logic -------------------
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# main routing logic
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route{
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# initial sanity checks -- messages with
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# max_forwards==0, or excessively long requests
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if (!mf_process_maxfwd_header("10")) {
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sl_send_reply("483","Too Many Hops");
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break;
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};
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if (msg:len >= max_len ) {
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sl_send_reply("513", "Message too big");
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break;
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};
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# !! Nathelper
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# Special handling for NATed clients; first, NAT test is
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# executed: it looks for via!=received and RFC1918 addresses
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# in Contact (may fail if line-folding is used); also,
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# the received test should, if completed, should check all
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# vias for rpesence of received
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if (nat_uac_test("3")) {
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# Allow RR-ed requests, as these may indicate that
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# a NAT-enabled proxy takes care of it; unless it is
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# a REGISTER
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if (method == "REGISTER" || ! search("^Record-Route:")) {
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log("LOG: Someone trying to register from private IP, rewriting\n");
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# This will work only for user agents that support symmetric
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# communication. We tested quite many of them and majority is
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# smart enough to be symmetric. In some phones it takes a configuration
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# option. With Cisco 7960, it is called NAT_Enable=Yes, with kphone it is
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# called "symmetric media" and "symmetric signalling".
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fix_nated_contact(); # Rewrite contact with source IP of signalling
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if (method == "INVITE") {
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fix_nated_sdp("1"); # Add direction=active to SDP
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};
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force_rport(); # Add rport parameter to topmost Via
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setflag(6); # Mark as NATed
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};
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};
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# we record-route all messages -- to make sure that
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# subsequent messages will go through our proxy; that's
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# particularly good if upstream and downstream entities
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# use different transport protocol
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if (!method=="REGISTER") record_route();
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# subsequent messages withing a dialog should take the
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# path determined by record-routing
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if (loose_route()) {
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# mark routing logic in request
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append_hf("P-hint: rr-enforced\r\n");
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route(1);
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break;
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};
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if (!uri==myself) {
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# mark routing logic in request
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append_hf("P-hint: outbound\r\n");
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route(1);
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break;
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};
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# if the request is for other domain use UsrLoc
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# (in case, it does not work, use the following command
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# with proper names and addresses in it)
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if (uri==myself) {
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if (method=="REGISTER") {
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# Uncomment this if you want to use digest authentication
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# if (!www_authorize("iptel.org", "subscriber")) {
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# www_challenge("iptel.org", "0");
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# break;
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# };
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save("location");
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break;
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};
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lookup("aliases");
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if (!uri==myself) {
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append_hf("P-hint: outbound alias\r\n");
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route(1);
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break;
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};
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# native SIP destinations are handled using our USRLOC DB
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if (!lookup("location")) {
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sl_send_reply("404", "Not Found");
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break;
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};
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};
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append_hf("P-hint: usrloc applied\r\n");
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route(1);
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}
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route[1]
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{
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# !! Nathelper
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if (uri=~"[@:](192\.168\.|10\.|172\.(1[6-9]|2[0-9]|3[0-1])\.)" && !search("^Route:")){
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sl_send_reply("479", "We don't forward to private IP addresses");
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break;
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};
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# if client or server know to be behind a NAT, enable relay
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if (isflagset(6)) {
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force_rtp_proxy();
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};
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# NAT processing of replies; apply to all transactions (for example,
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# re-INVITEs from public to private UA are hard to identify as
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# NATed at the moment of request processing); look at replies
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t_on_reply("1");
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# send it out now; use stateful forwarding as it works reliably
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# even for UDP2TCP
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if (!t_relay()) {
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sl_reply_error();
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};
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}
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# !! Nathelper
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onreply_route[1] {
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# NATed transaction ?
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if (isflagset(6) && status =~ "(183)|2[0-9][0-9]") {
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fix_nated_contact();
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force_rtp_proxy();
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# otherwise, is it a transaction behind a NAT and we did not
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# know at time of request processing ? (RFC1918 contacts)
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} else if (nat_uac_test("1")) {
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fix_nated_contact();
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};
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}
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