xmpp Module

Andreea Spirea

   <team@voice-system.ro>

Edited by

Andreea Spirea

   <team@voice-system.ro>

   Copyright © 2006-2008 voice-system.ro
   Revision History
   Revision $Revision: 5901 $ $Date: 2009-07-21 10:45:05 +0300
                              (Tue, 21 Jul 2009) $
     __________________________________________________________

   Table of Contents

   1. Admin Guide

        1.1. Overview
        1.2. Dependencies

              1.2.1. OpenSIPS Modules
              1.2.2. External Libraries or Applications

        1.3. Exported Parameters

              1.3.1. backend(string)
              1.3.2. xmpp_domain (string)
              1.3.3. xmpp_host (string)
              1.3.4. sip_domain (string)
              1.3.5. xmpp_port (integer)
              1.3.6. xmpp_password (string)
              1.3.7. outbound_proxy (string)

        1.4. Exported Functions

              1.4.1. xmpp_send_message()

        1.5. Configuration

   List of Examples

   1.1. Set backend parameter
   1.2. Set xmpp_domain parameter
   1.3. Set xmpp_host parameter
   1.4. Set xmpp_host parameter
   1.5. Set xmpp_port parameter
   1.6. Set xmpp_password parameter
   1.7. Set outbound_proxy parameter
   1.8. xmpp_send_message() usage

Chapter 1. Admin Guide

1.1. Overview

   This modules is a gateway between OpenSIPS and a jabber server.
   It enables the exchange of instant messages between SIP clients
   and XMPP(jabber) clients.

   The gateway has two modes to run:
     * the component-mode - the gateway requires a standalone XMPP
       server amd the 'xmpp' module acts as a XMPP component
     * the server-mode - the module acts itself as a XMPP server,
       no requirement for another XMPP server in the system. NOTE:
       this is limited implementation of a XMPP server, it does
       not support SRV or TLS so far. This mode is in beta stage
       for the moment.

   In the component mode, you need a local XMPP server
   (recommended jabberd2 or ejabberd); the xmpp module will relay
   all your connections to a tcp connection to the local jabber
   server.

   After you have a running XMPP server, what you need to do is
   set the following parameters in the OpenSIPS configuration
   file:
     * xmpp_domain and xmpp_host, which are explained in the
       Exported Parameters section;
     * listen = your ip;
     * alias=opensips domain and alias=gateway domain;
     * you can also change the jabber server password, which must
       be the same as the xmpp_password parameter.

   A use case, for the component-mode, would look like this:
     * OpenSIPS is running on sip-server.opensips.org;
     * the jabber server is running on xmpp.opensips.org;
     * the component is running on xmpp-sip.opensips.org.

   In the server mode, the xmpp module is a minimal jabber server,
   thus you do not need to install another jabber server, the
   gateway will connect to the jabber servers, where the users you
   want to chat with have an account.

   If you want to change to server-mode, you have to change the
   "backend" parameter, as shown in the Exported Parameters
   section, from component to server.

   A use case, for the server-mode, would look like this:
     * OpenSIPS is running on sip-server.opensips.org;
     * the "XMPP server" is running on xmpp-sip.opensips.org.

1.2. Dependencies

1.2.1. OpenSIPS Modules

   The following modules must be loaded before this module:
     * requires 'tm' module.

1.2.2. External Libraries or Applications

   The following libraries or applications must be installed
   before running OpenSIPS with this module loaded:
     * libexpat1-devel - used for parsing/building XML.

1.3. Exported Parameters

1.3.1. backend(string)

   The mode you are using the module; it can be either component
   or server.

   Default value is "component".

   Example 1.1. Set backend parameter
...
 modparam("xmpp", "backend", "server")
...

1.3.2. xmpp_domain (string)

   The xmpp domain of the component or the server, depending on
   the mode we are in.

   Default value is "127.0.0.1".

   Example 1.2. Set xmpp_domain parameter
...
 modparam("xmpp", "xmpp_domain", "xmpp.opensips.org")
...

1.3.3. xmpp_host (string)

   The ip address or the name of the local jabber server, if the
   backend is set to "component"; or the address to bind to in the
   server mode.

   Default value is "127.0.0.1".

   Example 1.3. Set xmpp_host parameter
...
 modparam("xmpp", "xmpp_host", "xmpp.opensips.org")
...

1.3.4. sip_domain (string)

   This parameter must be set only if the xmpp module is used in
   component mode and the domain that is the host for the jabber
   server is the same as the domain of the sip server(when using
   the same domain name for the SIP service and for the XMPP
   service). In this case, if we were to add buddies in xmpp
   accounts with that domain, then all the messages that will
   reach the jabber server will be considered to be for local xmpp
   users. It is necessary therefore to make a translate the sip
   domain name into another domain when sending messages in xmpp.
   This parameter is exactly the name that should be used as the
   SIP domain name in XMPP. Usage example: If the sip and xmpp
   domain is opensips.org and this parameter is set to
   sip.opensips.org, than in all the requests sent in xmpp the sip
   users will have the domain translated to sip.opensips.org.
   Also, in XMPP account the SIP buddies must have this domain:
   sip.opensips.org, and it will be translated to the real one
   opensips.org when traversing the gateway.

   Default value is NULL.

   Example 1.4. Set xmpp_host parameter
...
 modparam("xmpp", "sip_domain", "sip.opensips.org")
...

1.3.5. xmpp_port (integer)

   In the component mode, this is the port of the jabber router we
   connect to. In the server mode, it is the transport address to
   bind to.

   Default value is "5347", if backend is set to "component" and
   "5269", if backend is set to "server".

   Example 1.5. Set xmpp_port parameter
...
 modparam("xmpp", "xmpp_port", 5269)
...

1.3.6. xmpp_password (string)

   The password of the local jabber server.

   Default value is "secret"; if changed here, it must also be
   changed in the c2s.xml, added by the jabber server. This is how
   the default configuration for the jabberd2 looks like:
                        <router>
        ...............
        <!-- Username/password to authenticate as --&gt;
    <user>jabberd</user>;          <!-- default: jabberd -->;
    <pass>secret</pass>;           <!-- default: secret -->;

   Example 1.6. Set xmpp_password parameter
...
 modparam("xmpp", "xmpp_password", "secret")
...

1.3.7. outbound_proxy (string)

   The SIP address used as next hop when sending the message. Very
   useful when using OpenSIPS with a domain name not in DNS, or
   when using a separate OpenSIPS instance for xmpp processing. If
   not set, the message will be sent to the address in destination
   URI.

   Default value is NULL.

   Example 1.7. Set outbound_proxy parameter
...
 modparam("xmpp", "outbound_proxy", "sip:opensips.org;transport=tcp")
...

1.4. Exported Functions

1.4.1.  xmpp_send_message()

   Converts SIP messages to XMPP(jabber) messages, in order to be
   relayed to a XMPP(jabber) client.

   Example 1.8. xmpp_send_message() usage
...
xmpp_send_message();
...

1.5. Configuration

   Next is presented a sample configuration file one can use to
   implement a standalone SIP-to-XMPP gateway. You can run an
   instance of OpenSIPS on a separate machine or on different port
   with the following config, and have the main SIP server
   configured to forward all SIP requests for XMPP world to it.
....
#
# $Id: opensips-xmpp.cfg 6693 2010-03-10 10:06:38Z anca_vamanu $
#
# simple quick-start config script for XMPP GW
#
# make sure in your main SIP server that you send
# only the adequate SIP MESSAGES to XMPP GW
#
#
# ----------- global configuration parameters ------------------------

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

/* Uncomment these lines to enter debugging mode
fork=no
log_stderror=yes
*/

check_via=no    # (cmd. line: -v)
dns=no          # (cmd. line: -r)
rev_dns=no      # (cmd. line: -R)
children=4

listen=udp:10.10.10.10:5076
alias=sip-xmpp.opensips.org

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

mpath="/usr/local/opensips/lib/opensips/modules/"
loadmodule "sl.so"
loadmodule "tm.so"
loadmodule "rr.so"
loadmodule "maxfwd.so"
loadmodule "textops.so"
loadmodule "mi_fifo.so"


# XMPP
loadmodule "xmpp.so"

modparam("xmpp", "xmpp_domain", "xmpp-sip.opensips.org")
modparam("xmpp", "xmpp_host", "xmpp.opensips.org")

#modparam("xmpp", "backend", "server")
modparam("xmpp", "backend", "component")

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

# -- mi_fifo params --

modparam("mi_fifo", "fifo_name", "/tmp/opensips_fifo_xmpp")

# -- usrloc params --

# -- rr params --
# add value to ;lr param to make some broken UAs happy
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;
        };

        ### absorb retransmissions ###
        if (!t_newtran()) {
                sl_reply_error();
                return;
        }
        if (method == "MESSAGE") {
                log("*** xmpp-handled MESSAGE message.\n");
                if (xmpp_send_message()) {
                        t_reply("200", "Accepted");
                } else {
                        t_reply("404", "Not found");
                }
                return;
        }

        log("*** xmpp: unhandled message type\n");
        t_reply("503", "Service unavailable");
        return;
}


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