[Serusers] Fwd: Newbie Problems: ser.cfg

[frq ser]

---------- Forwarded message ----------
From: frq ser <frq.ser at googlemail.com>
Date: Dec 18, 2007 11:32 PM
Subject: Newbie Problems: ser.cfg
To: serusers at iptel.org

Hi,

I am trying to understand the process flow in the following ser.cfg file,
which controls a SER proxy server at root at ip.address:5060. I have added
"log()" command at almost every step to see how things proceed.

The problem is that when I generate an OPTIONS message through SIPSAK
(sipsak -T -vv -s sip:root at ip.address:5060), the process branches from
route(0) to route(3), sends a message (200 Message received, probably from
Sipsak), then comes back to route(0), completes this route, and then loops
back to start of route(0) (as evident from the last log message "Inside main
route..."). This is despite the "break" command in the main route block.
Here's the output of the SER:

[root at drone08 ~]# ser
Listening on
             udp: 192.168.3.208 [192.168.3.208]:5060
             tcp: 192.168.3.208 [192.168.3.208]:5060
Aliases:
             tcp: 192.168.3.208:5060
             udp: 192.168.3.208:5060

WARNING: no fork mode
stateless - initializing
 0(0) Maxfwd module- initializing
 0(0) INFO: udp_init: SO_RCVBUF is initially 107520
 0(0) INFO: udp_init: SO_RCVBUF is finally 262142
 2(0) INFO: fifo process starting: 5116
 2(0) SER: open_uac_fifo: fifo server up at /tmp/ser_fifo...
 2(0) WARNING: no fifo_db_url given - fifo DB commands disabled!
 0(5114) Inside the main route....
 0(5114) Inside the main route....
 0(5114) just passed the sanity checks...
 0(5114) inside method-register...
 0(5114) inside method-options...
 0(5114) Inside route3...
 0(5114) End of route3...
 0(5114) just past redir-route3..
 0(5114) Inside the main route....

 The corresponding SIPSAK output is:
 C:\..Sipsak>sipsak -v -T -s sip:root at 192.168.3.208:5060
warning: IP extract from warning activated to be more informational
0: 192.168.3.208 (0.000 ms) SIP/2.0 483 Too Many Hops
1: 192.168.3.208 (0.000 ms) SIP/2.0 201 Options message received, probably
from
Sipsak
        without Contact header


On the other hand, when I send an INVITE message, this problem doesn't
happen. The process completes the main route and doesn't loop back (ie I
don't get the "Inside the main route..." message).

[root at drone08 ~]# ser
Listening on
             udp: 192.168.3.208 [192.168.3.208]:5060
             tcp: 192.168.3.208 [192.168.3.208]:5060
Aliases:
             tcp: 192.168.3.208:5060
             udp: 192.168.3.208:5060

WARNING: no fork mode
stateless - initializing
 0(0) Maxfwd module- initializing
 0(0) INFO: udp_init: SO_RCVBUF is initially 107520
 0(0) INFO: udp_init: SO_RCVBUF is finally 262142
 2(0) INFO: fifo process starting: 4860
 2(0) SER: open_uac_fifo: fifo server up at /tmp/ser_fifo...
 2(0) WARNING: no fifo_db_url given - fifo DB commands disabled!
 0(4858) Inside the main route....
 0(4858) just passed the sanity checks...
 0(4858) inside method-register...
 0(4858) outside methods-options...
 0(4858) inside lookup-location...


All I want to know is that when I send an OPTIONS msg, why the process
doesn't terminate at the break command in the (if (method == "OPTIONS")) in
the main route. Although it is not a critical problem, I just want to
improve my understanding. I'll be glad if any of you could help.

Fr.

PS: The config file (ser.cfg) is given below:

# $Id: hello-world.cfg 46 2006-01-25 04:21:30Z /CN=Paul
Hazlett/emailAddress=paul at onsip.org $
debug=3
fork=no
log_stderror=yes

listen= 192.168.3.208  #2.13
port=5060
children=4

dns=no
rev_dns=no
fifo="/tmp/ser_fifo"

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"

# chg_rsf dec07
#loadmodule "/usr/local/lib/ser/modules/textops.so"
#loadmodule "/usr/local/lib/ser/modules/avpops.so"

modparam("usrloc", "db_mode",   0)
modparam("rr", "enable_full_lr", 1)


#modparam("tm", "pass_provisional_replies", 1)

route {
 log(1, "Inside the main route....\n");

 # ------------------------------------------------------------------------
 # Sanity Check Section
 # ------------------------------------------------------------------------
 if (!mf_process_maxfwd_header("10")) {
  sl_send_reply("483", "Too Many Hops");
  break;
 };

 if (msg:len > max_len) {
  sl_send_reply("513", "Message Overflow");
  break;
 };

 log(3, "just passed the sanity checks...\n");

 # ------------------------------------------------------------------------
 # Record Route Section
 # ------------------------------------------------------------------------

 if (method!="REGISTER") {
  record_route();
  log(3, "inside method-register...\n");
 };

 # ------------------------------------------------------------------------
 # Loose Route Section
 # ------------------------------------------------------------------------
 if (loose_route()) {
  log(3, "inside loose route...\n");
  route(1);
  break;
 };

 # ------------------------------------------------------------------------
 # Call Type Processing Section
 # ------------------------------------------------------------------------
 if (uri!=myself) {
  log(3, "inside uri-myself...\n");
  route(1);
  break;
 };

 if (method=="ACK") {
  log(3, "inside method-ack...\n");
  route(1);
  break;
 }

 else if (method=="REGISTER") {
  log(3, "inside method-register...\n");
  route(2);
  break;
 };

 if (method=="OPTIONS"){
  log(3, "inside method-options...\n");
  route(3);
  log(3, "just past redir-route3..\n");
  break;
  log(3, "just past break...\n");
 };
 log(3, "outside methods-options...\n");

 lookup("aliases");
 if (uri!=myself) {
  log(3, "inside uri-myself 2....\n");
  route(1);
  break;
 };

 if (!lookup("location")) {
  log(3, "inside lookup-location...\n");
  sl_send_reply("404", "User Not Found");
  break;
 };

 route(1);
}

route[1] {
 # ------------------------------------------------------------------------
 # Default Message Handler
 # ------------------------------------------------------------------------
 log(3, "Inside route1...\n");
 if (!t_relay()) {
  sl_reply_error();
 };
}

route[2] {
 # ------------------------------------------------------------------------
 # REGISTER Message Handler
 # ------------------------------------------------------------------------
 log(3, "Inside route2...\n");
 if (!save("location")) {
  #sl_reply_error();
  sl_send_reply("201", "Register message received at Proxy Server");
 };
}
route[3]{
 # -----------------------------------------------------------------------
 # OPTIONS Message Handler
 # -----------------------------------------------------------------------
 log(3, "Inside route3...\n");
 if (!t_relay()){
  sl_reply_error();

 };

 sl_send_reply("201", "Options message received, probably from Sipsak");
 #forward(192.168.3.208, 5070);
 log(3, "End of route3...\n");
 #t_release();

}
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