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   & ejabberd 2.0.0 beta 1 
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   & Installation and Operation Guide
 
 
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<!--HEVEA command line is: /usr/local/bin/hevea -fix -noiso -pedantic guide.tex -->
<!--CUT DEF chapter 1 --><P><A NAME="titlepage"></A>

</P><TABLE CLASS="title"><TR><TD><H1 CLASS="titlemain">
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<TABLE CELLSPACING=6 CELLPADDING=0><TR><TD VALIGN=top ALIGN=left>&nbsp;</TD><TD VALIGN=top ALIGN=right NOWRAP><FONT SIZE=6><B>ejabberd 2.0.0 beta 1 </B></FONT></TD></TR>
<TR><TD VALIGN=top ALIGN=left>&nbsp;</TD><TD VALIGN=top ALIGN=right NOWRAP>&nbsp;</TD></TR>
<TR><TD VALIGN=top ALIGN=left>&nbsp;</TD><TD VALIGN=top ALIGN=right NOWRAP><FONT SIZE=6>Installation and Operation Guide</FONT></TD></TR>
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</H1><H3 CLASS="titlerest"><TABLE CELLSPACING=6 CELLPADDING=0><TR><TD VALIGN=top ALIGN=left>ejabberd Development Team</TD></TR>
</TABLE></H3></TD></TR>
</TABLE><!--TOC chapter Contents-->
<H1 CLASS="chapter"><!--SEC ANCHOR -->Contents</H1><!--SEC END --><UL CLASS="toc"><LI CLASS="li-toc">
<A HREF="#htoc1">Chapter&#XA0;1&#XA0;&#XA0;Introduction</A>
<UL CLASS="toc"><LI CLASS="li-toc">
<A HREF="#htoc2">1.1&#XA0;&#XA0;Key Features</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc3">1.2&#XA0;&#XA0;Additional Features</A>
</LI></UL>
</LI><LI CLASS="li-toc"><A HREF="#htoc4">Chapter&#XA0;2&#XA0;&#XA0;Installing ejabberd</A>
<UL CLASS="toc"><LI CLASS="li-toc">
<A HREF="#htoc5">2.1&#XA0;&#XA0;Installing ejabberd with Graphical Installer</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc6">2.2&#XA0;&#XA0;Installation from Source</A>
<UL CLASS="toc"><LI CLASS="li-toc">
<A HREF="#htoc7">2.2.1&#XA0;&#XA0;Installation Requirements</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc8">2.2.2&#XA0;&#XA0;Obtaining <TT>ejabberd</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc9">2.2.3&#XA0;&#XA0;Compilation</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc10">2.2.4&#XA0;&#XA0;Starting</A>
</LI></UL>
</LI><LI CLASS="li-toc"><A HREF="#htoc11">2.3&#XA0;&#XA0;Creating an Initial Administrator</A>
</LI></UL>
</LI><LI CLASS="li-toc"><A HREF="#htoc12">Chapter&#XA0;3&#XA0;&#XA0;Configuring ejabberd</A>
<UL CLASS="toc"><LI CLASS="li-toc">
<A HREF="#htoc13">3.1&#XA0;&#XA0;Basic Configuration</A>
<UL CLASS="toc"><LI CLASS="li-toc">
<A HREF="#htoc14">3.1.1&#XA0;&#XA0;Host Names</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc15">3.1.2&#XA0;&#XA0;Virtual Hosting</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc16">3.1.3&#XA0;&#XA0;Listened Sockets</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc17">3.1.4&#XA0;&#XA0;Authentication</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc18">3.1.5&#XA0;&#XA0;Access Rules</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc19">3.1.6&#XA0;&#XA0;Shapers</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc20">3.1.7&#XA0;&#XA0;Default Language</A>
</LI></UL>
</LI><LI CLASS="li-toc"><A HREF="#htoc21">3.2&#XA0;&#XA0;Database and LDAP Configuration</A>
<UL CLASS="toc"><LI CLASS="li-toc">
<A HREF="#htoc22">3.2.1&#XA0;&#XA0;MySQL</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc23">3.2.2&#XA0;&#XA0;Microsoft SQL Server</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc24">3.2.3&#XA0;&#XA0;PostgreSQL</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc25">3.2.4&#XA0;&#XA0;ODBC Compatible</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc26">3.2.5&#XA0;&#XA0;LDAP</A>
</LI></UL>
</LI><LI CLASS="li-toc"><A HREF="#htoc27">3.3&#XA0;&#XA0;Modules Configuration</A>
<UL CLASS="toc"><LI CLASS="li-toc">
<A HREF="#htoc28">3.3.1&#XA0;&#XA0;Overview</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc29">3.3.2&#XA0;&#XA0;Common Options</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc30">3.3.3&#XA0;&#XA0;<TT>mod_announce</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc31">3.3.4&#XA0;&#XA0;<TT>mod_disco</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc32">3.3.5&#XA0;&#XA0;<TT>mod_echo</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc33">3.3.6&#XA0;&#XA0;<TT>mod_irc</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc34">3.3.7&#XA0;&#XA0;<TT>mod_last</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc35">3.3.8&#XA0;&#XA0;<TT>mod_muc</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc36">3.3.9&#XA0;&#XA0;<TT>mod_muc_log</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc37">3.3.10&#XA0;&#XA0;<TT>mod_offline</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc38">3.3.11&#XA0;&#XA0;<TT>mod_privacy</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc39">3.3.12&#XA0;&#XA0;<TT>mod_private</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc40">3.3.13&#XA0;&#XA0;<TT>mod_proxy65</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc41">3.3.14&#XA0;&#XA0;<TT>mod_pubsub</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc42">3.3.15&#XA0;&#XA0;<TT>mod_register</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc43">3.3.16&#XA0;&#XA0;<TT>mod_roster</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc44">3.3.17&#XA0;&#XA0;<TT>mod_service_log</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc45">3.3.18&#XA0;&#XA0;<TT>mod_shared_roster</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc46">3.3.19&#XA0;&#XA0;<TT>mod_stats</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc47">3.3.20&#XA0;&#XA0;<TT>mod_time</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc48">3.3.21&#XA0;&#XA0;<TT>mod_vcard</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc49">3.3.22&#XA0;&#XA0;<TT>mod_vcard_ldap</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc50">3.3.23&#XA0;&#XA0;<TT>mod_version</TT></A>
</LI></UL>
</LI></UL>
</LI><LI CLASS="li-toc"><A HREF="#htoc51">Chapter&#XA0;4&#XA0;&#XA0;Managing an ejabberd server</A>
<UL CLASS="toc"><LI CLASS="li-toc">
<A HREF="#htoc52">4.1&#XA0;&#XA0;Online Configuration and Monitoring</A>
<UL CLASS="toc"><LI CLASS="li-toc">
<A HREF="#htoc53">4.1.1&#XA0;&#XA0;Web Interface</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc54">4.1.2&#XA0;&#XA0;<TT>ejabberdctl</TT></A>
</LI></UL>
</LI></UL>
</LI><LI CLASS="li-toc"><A HREF="#htoc55">Chapter&#XA0;5&#XA0;&#XA0;Securing ejabberd</A>
<UL CLASS="toc"><LI CLASS="li-toc">
<A HREF="#htoc56">5.1&#XA0;&#XA0;Firewall Settings</A>
</LI></UL>
</LI><LI CLASS="li-toc"><A HREF="#htoc57">Chapter&#XA0;6&#XA0;&#XA0;Integrating ejabberd with other Instant Messaging servers</A>
<UL CLASS="toc"><LI CLASS="li-toc">
<A HREF="#htoc58">6.1&#XA0;&#XA0;SRV Records</A>
</LI></UL>
</LI><LI CLASS="li-toc"><A HREF="#htoc59">Chapter&#XA0;7&#XA0;&#XA0;Clustering</A>
<UL CLASS="toc"><LI CLASS="li-toc">
<A HREF="#htoc60">7.1&#XA0;&#XA0;How it Works</A>
<UL CLASS="toc"><LI CLASS="li-toc">
<A HREF="#htoc61">7.1.1&#XA0;&#XA0;Router</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc62">7.1.2&#XA0;&#XA0;Local Router</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc63">7.1.3&#XA0;&#XA0;Session Manager</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc64">7.1.4&#XA0;&#XA0;s2s Manager</A>
</LI></UL>
</LI><LI CLASS="li-toc"><A HREF="#htoc65">7.2&#XA0;&#XA0;Clustering Setup</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc66">7.3&#XA0;&#XA0;Service Load-Balancing</A>
<UL CLASS="toc"><LI CLASS="li-toc">
<A HREF="#htoc67">7.3.1&#XA0;&#XA0;Components Load-Balancing</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc68">7.3.2&#XA0;&#XA0;Domain Load-Balancing Algorithm</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc69">7.3.3&#XA0;&#XA0;Load-Balancing Buckets</A>
</LI></UL>
</LI></UL>
</LI><LI CLASS="li-toc"><A HREF="#htoc70">Chapter&#XA0;8&#XA0;&#XA0;Debugging</A>
<UL CLASS="toc"><LI CLASS="li-toc">
<A HREF="#htoc71">8.1&#XA0;&#XA0;Watchdog alerts</A>
</LI></UL>
</LI><LI CLASS="li-toc"><A HREF="#htoc72">Appendix&#XA0;A&#XA0;&#XA0;Internationalization and Localization</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc73">Appendix&#XA0;B&#XA0;&#XA0;Release Notes</A>
<UL CLASS="toc"><LI CLASS="li-toc">
<A HREF="#htoc74">B.1&#XA0;&#XA0;ejabberd 0.9</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc75">B.2&#XA0;&#XA0;ejabberd 0.9.1</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc76">B.3&#XA0;&#XA0;ejabberd 0.9.8</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc77">B.4&#XA0;&#XA0;ejabberd 1.0.0</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc78">B.5&#XA0;&#XA0;ejabberd 1.1.0</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc79">B.6&#XA0;&#XA0;ejabberd 1.1.1</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc80">B.7&#XA0;&#XA0;ejabberd 1.1.2</A>
</LI></UL>
</LI><LI CLASS="li-toc"><A HREF="#htoc81">Appendix&#XA0;C&#XA0;&#XA0;Acknowledgements</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc82">Appendix&#XA0;D&#XA0;&#XA0;Copyright Information</A>
</LI></UL><!--TOC chapter Introduction-->
<H1 CLASS="chapter"><!--SEC ANCHOR --><A NAME="htoc1">Chapter&#XA0;1</A>&#XA0;&#XA0;Introduction</H1><!--SEC END --><P>
<A NAME="intro"></A></P><P><TT>ejabberd</TT> is a free and open source instant messaging server written in <A HREF="http://www.erlang.org/">Erlang</A>.</P><P><TT>ejabberd</TT> is cross-platform, distributed, fault-tolerant, and based on open standards to achieve real-time communication.</P><P><TT>ejabberd</TT> is designed to be a rock-solid and feature rich XMPP server.</P><P><TT>ejabberd</TT> is suitable for small deployments, whether they need to be scalable or not, as well as extremely big deployments.</P><!--TOC section Key Features-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc2">1.1</A>&#XA0;&#XA0;Key Features</H2><!--SEC END --><P>
<A NAME="keyfeatures"></A>
</P><P><TT>ejabberd</TT> is:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
Cross-platform: <TT>ejabberd</TT> runs under Microsoft Windows and Unix derived systems such as Linux, FreeBSD and NetBSD.</LI><LI CLASS="li-itemize">Distributed: You can run <TT>ejabberd</TT> on a cluster of machines and all of them will serve the same Jabber domain(s). When you need more capacity you can simply add a new cheap node to your cluster. Accordingly, you do not need to buy an expensive high-end machine to support tens of thousands concurrent users.</LI><LI CLASS="li-itemize">Fault-tolerant: You can deploy an <TT>ejabberd</TT> cluster so that all the information required for a properly working service will be replicated permanently on all nodes. This means that if one of the nodes crashes, the others will continue working without disruption. In addition, nodes also can be added or replaced `on the fly'.</LI><LI CLASS="li-itemize">Administrator Friendly: <TT>ejabberd</TT> is built on top of the Open Source Erlang. As a result you do not need to install an external database, an external web server, amongst others because everything is already included, and ready to run out of the box. Other administrator benefits include:
<UL CLASS="itemize"><LI CLASS="li-itemize">
Comprehensive documentation.
</LI><LI CLASS="li-itemize">Straightforward installers for Linux, Mac OS X, and Windows. </LI><LI CLASS="li-itemize">Web interface for administration tasks.
</LI><LI CLASS="li-itemize">Shared Roster Groups.
</LI><LI CLASS="li-itemize">Command line administration tool. </LI><LI CLASS="li-itemize">Can integrate with existing authentication mechanisms.
</LI><LI CLASS="li-itemize">Capability to send announce messages.
</LI></UL></LI><LI CLASS="li-itemize">Internationalized: <TT>ejabberd</TT> leads in internationalization. Hence it is very well suited in a globalized world. Related features are:
<UL CLASS="itemize"><LI CLASS="li-itemize">
Translated in 12 languages. </LI><LI CLASS="li-itemize">Support for <A HREF="http://www.ietf.org/rfc/rfc3490.txt">IDNA</A>.
</LI></UL></LI><LI CLASS="li-itemize">Open Standards: <TT>ejabberd</TT> is the first Open Source Jabber server claiming to fully comply to the XMPP standard.
<UL CLASS="itemize"><LI CLASS="li-itemize">
Fully XMPP compliant.
</LI><LI CLASS="li-itemize">XML-based protocol.
</LI><LI CLASS="li-itemize"><A HREF="http://ejabberd.jabber.ru/protocols">Many protocols supported</A>.
</LI></UL></LI></UL><!--TOC section Additional Features-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc3">1.2</A>&#XA0;&#XA0;Additional Features</H2><!--SEC END --><P>
<A NAME="addfeatures"></A>
</P><P>Moreover, <TT>ejabberd</TT> comes with a wide range of other state-of-the-art features:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
Modular
<UL CLASS="itemize"><LI CLASS="li-itemize">
Load only the modules you want.
</LI><LI CLASS="li-itemize">Extend <TT>ejabberd</TT> with your own custom modules.
</LI></UL>
</LI><LI CLASS="li-itemize">Security
<UL CLASS="itemize"><LI CLASS="li-itemize">
SASL and STARTTLS for c2s and s2s connections.
</LI><LI CLASS="li-itemize">STARTTLS and Dialback s2s connections.
</LI><LI CLASS="li-itemize">Web interface accessible via HTTPS secure access.
</LI></UL>
</LI><LI CLASS="li-itemize">Databases
<UL CLASS="itemize"><LI CLASS="li-itemize">
Native MySQL support.
</LI><LI CLASS="li-itemize">Native PostgreSQL support.
</LI><LI CLASS="li-itemize">Mnesia.
</LI><LI CLASS="li-itemize">ODBC data storage support.
</LI><LI CLASS="li-itemize">Microsoft SQL Server support. </LI></UL>
</LI><LI CLASS="li-itemize">Authentication
<UL CLASS="itemize"><LI CLASS="li-itemize">
LDAP and ODBC. </LI><LI CLASS="li-itemize">External Authentication script.
</LI><LI CLASS="li-itemize">Internal Authentication.
</LI></UL>
</LI><LI CLASS="li-itemize">Others
<UL CLASS="itemize"><LI CLASS="li-itemize">
Compressing XML streams with Stream Compression (<A HREF="http://www.xmpp.org/extensions/xep-0138.html">XEP-0138</A>).
</LI><LI CLASS="li-itemize">Interface with networks such as AIM, ICQ and MSN.
</LI><LI CLASS="li-itemize">Statistics via Statistics Gathering (<A HREF="http://www.xmpp.org/extensions/xep-0039.html">XEP-0039</A>).
</LI><LI CLASS="li-itemize">IPv6 support both for c2s and s2s connections.
</LI><LI CLASS="li-itemize"><A HREF="http://www.xmpp.org/extensions/xep-0045.html">Multi-User Chat</A> module with logging. </LI><LI CLASS="li-itemize">Users Directory based on users vCards.
</LI><LI CLASS="li-itemize"><A HREF="http://www.xmpp.org/extensions/xep-0060.html">Publish-Subscribe</A> component.
</LI><LI CLASS="li-itemize">Support for virtual hosting.
</LI><LI CLASS="li-itemize"><A HREF="http://www.xmpp.org/extensions/xep-0025.html">HTTP Polling</A> service.
</LI><LI CLASS="li-itemize">IRC transport.
</LI></UL>
</LI></UL><!--TOC chapter Installing ejabberd-->
<H1 CLASS="chapter"><!--SEC ANCHOR --><A NAME="htoc4">Chapter&#XA0;2</A>&#XA0;&#XA0;Installing ejabberd</H1><!--SEC END --><!--TOC section Installing ejabberd with Graphical Installer-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc5">2.1</A>&#XA0;&#XA0;Installing ejabberd with Graphical Installer</H2><!--SEC END --><P>The easiest approach to install an ejabberd Instant Messaging server
is to use the graphical installer. The installer is available from
Process-one
website<A HREF="http://www.process-one.net/en/ejabberd/downloads/">.</A></P><P>The installer will deploy and configure a full featured ejabberd
server and does not require any extra dependancies.</P><!--TOC section Installation from Source-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc6">2.2</A>&#XA0;&#XA0;Installation from Source</H2><!--SEC END --><P>
<A NAME="installsource"></A>
</P><!--TOC subsection Installation Requirements-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc7">2.2.1</A>&#XA0;&#XA0;Installation Requirements</H3><!--SEC END --><P>
<A NAME="installreq"></A>
</P><!--TOC subsubsection `Unix-like' operating systems-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->`Unix-like' operating systems</H4><!--SEC END --><P>
<A NAME="installrequnix"></A></P><P>To compile <TT>ejabberd</TT> on a `Unix-like' operating system, you need:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
GNU Make
</LI><LI CLASS="li-itemize">GCC
</LI><LI CLASS="li-itemize">libexpat 1.95 or higher
</LI><LI CLASS="li-itemize">Erlang/OTP R9C-2 or higher
</LI><LI CLASS="li-itemize">OpenSSL 0.9.6 or higher (optional)
</LI><LI CLASS="li-itemize">Zlib 1.2.3 or higher (optional)
</LI><LI CLASS="li-itemize">GNU Iconv 1.8 or higher (optional, not needed on systems with GNU libc)
</LI></UL><!--TOC subsubsection Windows-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Windows</H4><!--SEC END --><P>
<A NAME="installreqwin"></A></P><P>To compile <TT>ejabberd</TT> on a Windows flavour, you need:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
MS Visual C++ 6.0 Compiler
</LI><LI CLASS="li-itemize"><A HREF="http://erlang.org/download.html">Erlang/OTP R9C-2 or higher</A>
</LI><LI CLASS="li-itemize"><A HREF="http://sourceforge.net/project/showfiles.php?group_id=10127&package_id=11277">Expat 1.95.7 or higher</A>
</LI><LI CLASS="li-itemize"><A HREF="http://www.gnu.org/software/libiconv/">GNU Iconv 1.9.1</A>
(optional)
</LI><LI CLASS="li-itemize"><A HREF="http://www.slproweb.com/products/Win32OpenSSL.html">Shining Light OpenSSL</A>
(to enable SSL connections)
</LI><LI CLASS="li-itemize"><A HREF="http://www.zlib.net/">Zlib 1.2.3 or higher</A>
</LI></UL><!--TOC subsection Obtaining <TT>ejabberd</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc8">2.2.2</A>&#XA0;&#XA0;Obtaining <TT>ejabberd</TT></H3><!--SEC END --><P>
<A NAME="obtaining"></A></P><P>
Released versions of <TT>ejabberd</TT> can be obtained from<BR>
<A HREF="http://www.process-one.net/en/projects/ejabberd/download.html"><TT>http://www.process-one.net/en/projects/ejabberd/download.html</TT></A>.</P><P>
The latest development version can be retrieved from the Subversion repository.
</P><PRE CLASS="verbatim">  svn co http://svn.process-one.net/ejabberd/trunk ejabberd
</PRE><!--TOC subsection Compilation-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc9">2.2.3</A>&#XA0;&#XA0;Compilation</H3><!--SEC END --><P>
<A NAME="compile"></A>
</P><!--TOC subsubsection `Unix-like' operating systems-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->`Unix-like' operating systems</H4><!--SEC END --><P>
<A NAME="compileunix"></A></P><P>Compile <TT>ejabberd</TT> on a `Unix-like' operating system by executing:</P><PRE CLASS="verbatim">  ./configure
  make
  su
  make install
</PRE><P>These commands will:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
install <TT>ejabberd</TT> into the directory <CODE>/var/lib/ejabberd</CODE>,
</LI><LI CLASS="li-itemize">install the configuration file into <CODE>/etc/ejabberd</CODE>,
</LI><LI CLASS="li-itemize">create a directory called <CODE>/var/log/ejabberd</CODE> to store log files.
</LI></UL><P>Note: if you want to use an external database, you need to execute the configure
script with the option(s) <TT>&#X2013;enable-odbc</TT> or <TT>&#X2013;enable-odbc
&#X2013;enable-mssql</TT>. See section&#XA0;<A HREF="#database">3.2</A> for more information.</P><!--TOC subsubsection Windows-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Windows</H4><!--SEC END --><P>
<A NAME="compilewin"></A></P><UL CLASS="itemize"><LI CLASS="li-itemize">
Install Erlang emulator (for example, into <CODE>C:\Program Files\erl5.3</CODE>).
</LI><LI CLASS="li-itemize">Install Expat library into <CODE>C:\Program Files\Expat-1.95.7</CODE>
directory.<P>Copy file <CODE>C:\Program Files\Expat-1.95.7\Libs\libexpat.dll</CODE>
to your Windows system directory (for example, <CODE>C:\WINNT</CODE> or
<CODE>C:\WINNT\System32</CODE>)
</P></LI><LI CLASS="li-itemize">Build and install the Iconv library into the directory
<CODE>C:\Program Files\iconv-1.9.1</CODE>.<P>Copy file <CODE>C:\Program Files\iconv-1.9.1\bin\iconv.dll</CODE> to your
Windows system directory (more installation instructions can be found in the
file README.woe32 in the iconv distribution).</P><P>Note: instead of copying libexpat.dll and iconv.dll to the Windows
directory, you can add the directories
<CODE>C:\Program Files\Expat-1.95.7\Libs</CODE> and
<CODE>C:\Program Files\iconv-1.9.1\bin</CODE> to the <CODE>PATH</CODE> environment
variable.
</P></LI><LI CLASS="li-itemize">While in the directory <CODE>ejabberd\src</CODE> run:
<PRE CLASS="verbatim">configure.bat
nmake -f Makefile.win32
</PRE></LI><LI CLASS="li-itemize">Edit the file <CODE>ejabberd\src\ejabberd.cfg</CODE> and run
<PRE CLASS="verbatim">werl -s ejabberd -name ejabberd
</PRE></LI></UL><!--TOC subsection Starting-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc10">2.2.4</A>&#XA0;&#XA0;Starting</H3><!--SEC END --><P>
<A NAME="start"></A>

</P><P>Execute the following command to start <TT>ejabberd</TT>:
</P><PRE CLASS="verbatim">  erl -pa /var/lib/ejabberd/ebin -name ejabberd -s ejabberd
</PRE><P>or
</P><PRE CLASS="verbatim">  erl -pa /var/lib/ejabberd/ebin -sname ejabberd -s ejabberd
</PRE><P>In the latter case the Erlang node will be identified using only the first part
of the host name, i.&#XA0;e. other Erlang nodes outside this domain cannot contact
this node.</P><P>Note that when using the above command, <TT>ejabberd</TT> will search for the
configuration file in the current directory and will use the current directory
for storing its user database and for logging.</P><P>To specify the path to the configuration file, the log files and the Mnesia
database directory, you may use the following command:
</P><PRE CLASS="verbatim">  erl -pa /var/lib/ejabberd/ebin \
      -sname ejabberd \
      -s ejabberd \
      -ejabberd config \"/etc/ejabberd/ejabberd.cfg\" \
                log_path \"/var/log/ejabberd/ejabberd.log\" \
      -sasl sasl_error_logger \{file,\"/var/log/ejabberd/sasl.log\"\} \
      -mnesia dir \"/var/lib/ejabberd/spool\"
</PRE><P>You can find other useful options in the Erlang manual page
(<TT>erl -man erl</TT>).</P><P>To use more than 1024 connections, you should set the environment variable
<CODE>ERL_MAX_PORTS</CODE>:
</P><PRE CLASS="verbatim">  export ERL_MAX_PORTS=32000
</PRE><P>Note that with this value, <TT>ejabberd</TT> will use more memory (approximately 6&#XA0;MB
more).</P><P>To reduce memory usage, you may set the environment variable
<CODE>ERL_FULLSWEEP_AFTER</CODE>:
</P><PRE CLASS="verbatim">  export ERL_FULLSWEEP_AFTER=0
</PRE><P>But in this case <TT>ejabberd</TT> can start to work slower.</P><!--TOC section Creating an Initial Administrator-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc11">2.3</A>&#XA0;&#XA0;Creating an Initial Administrator</H2><!--SEC END --><P>
<A NAME="initialadmin"></A></P><P>Before the web interface can be entered to perform administration tasks, an
account with administrator rights is needed on your <TT>ejabberd</TT> deployment.</P><P>Instructions to create an initial administrator account:
</P><OL CLASS="enumerate" type=1><LI CLASS="li-enumerate">
Register an account on your <TT>ejabberd</TT> deployment. An account can be
created in two ways:
<OL CLASS="enumerate" type=a><LI CLASS="li-enumerate">
Using the tool <TT>ejabberdctl</TT> (see
section&#XA0;<A HREF="#ejabberdctl">4.1.2</A>):
<PRE CLASS="verbatim">% ejabberdctl node@host register admin example.org password
</PRE></LI><LI CLASS="li-enumerate">Using In-Band Registration (see section&#XA0;<A HREF="#modregister">3.3.15</A>): you can
use a Jabber client to register an account.
</LI></OL>
</LI><LI CLASS="li-enumerate">Edit the configuration file to promote the account created in the previous
step to an account with administrator rights. Note that if you want to add
more administrators, a seperate acl entry is needed for each administrator.
<PRE CLASS="verbatim">  {acl, admins, {user, "admin", "example.org"}}.
  {access, configure, [{allow, admins}]}.
</PRE></LI><LI CLASS="li-enumerate">Restart <TT>ejabberd</TT> to load the new configuration.
</LI><LI CLASS="li-enumerate">Open the web interface (<CODE>http://server:port/admin/</CODE>) in your
favourite browser. Make sure to enter the <EM>full</EM> JID as username (in this
example: <TT>admin@example.org</TT>. The reason that you also need to enter the
suffix, is because <TT>ejabberd</TT>'s virtual hosting support.
</LI></OL><!--TOC chapter Configuring ejabberd-->
<H1 CLASS="chapter"><!--SEC ANCHOR --><A NAME="htoc12">Chapter&#XA0;3</A>&#XA0;&#XA0;Configuring ejabberd</H1><!--SEC END --><!--TOC section Basic Configuration-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc13">3.1</A>&#XA0;&#XA0;Basic Configuration</H2><!--SEC END --><P>
<A NAME="basicconfig"></A>
</P><P>The configuration file will be loaded the first time you start <TT>ejabberd</TT>. The
content from this file will be parsed and stored in a database. Subsequently the
configuration will be loaded from the database and any commands in the
configuration file are appended to the entries in the database. The
configuration file contains a sequence of Erlang terms. Lines beginning with a
<TT>`%'</TT> sign are ignored. Each term is a tuple of which the first element is
the name of an option, and any further elements are that option's values. If the
configuration file do not contain for instance the `hosts' option, the old
host name(s) stored in the database will be used.</P><P>You can override the old values stored in the database by adding next lines to
the configuration file:
</P><PRE CLASS="verbatim">  override_global.
  override_local.
  override_acls.
</PRE><P>With these lines the old global options, local options and ACLs will be removed
before new ones are added.</P><!--TOC subsection Host Names-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc14">3.1.1</A>&#XA0;&#XA0;Host Names</H3><!--SEC END --><P>
<A NAME="hostnames"></A>
</P><P>The option <TT>hosts</TT> defines a list containing one or more domains that
<TT>ejabberd</TT> will serve.</P><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
Serving one domain:
<PRE CLASS="verbatim">  {hosts, ["example.org"]}.
</PRE></LI><LI CLASS="li-itemize">Serving one domain, and backwards compatible with older <TT>ejabberd</TT>
versions:
<PRE CLASS="verbatim">  {host, "example.org"}.
</PRE></LI><LI CLASS="li-itemize">Serving two domains:
<PRE CLASS="verbatim">  {hosts, ["example.net", "example.com"]}.
</PRE></LI></UL><!--TOC subsection Virtual Hosting-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc15">3.1.2</A>&#XA0;&#XA0;Virtual Hosting</H3><!--SEC END --><P>
<A NAME="virtualhost"></A>
</P><P>Options can be defined separately for every virtual host using the
<TT>host_config</TT> option. It has the following
syntax:
</P><PRE CLASS="verbatim">  {host_config, &lt;hostname&gt;, [&lt;option&gt;, &lt;option&gt;, ...]}.
</PRE><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
Domain <TT>example.net</TT> is using the internal authentication method while
domain <TT>example.com</TT> is using the LDAP server running on the
domain <TT>localhost</TT> to perform authentication:
<PRE CLASS="verbatim">{host_config, "example.net", [{auth_method, internal}]}.

{host_config, "example.com", [{auth_method, ldap},
                              {ldap_servers, ["localhost"]},
                              {ldap_uids, [{"uid"}]},
                              {ldap_rootdn, "dc=localdomain"},
                              {ldap_rootdn, "dc=example,dc=com"},
                              {ldap_password, ""}]}.
</PRE></LI><LI CLASS="li-itemize">Domain <TT>example.net</TT> is using ODBC to perform authentication
while domain <TT>example.com</TT> is using the LDAP servers running on the domains
<TT>localhost</TT> and <TT>otherhost</TT>:
<PRE CLASS="verbatim">{host_config, "example.net", [{auth_method, odbc},
                              {odbc_server, "DSN=ejabberd;UID=ejabberd;PWD=ejabberd"}]}.

{host_config, "example.com", [{auth_method, ldap},
                              {ldap_servers, ["localhost", "otherhost"]},
                              {ldap_uids, [{"uid"}]},
                              {ldap_rootdn, "dc=localdomain"},
                              {ldap_rootdn, "dc=example,dc=com"},
                              {ldap_password, ""}]}.
</PRE></LI></UL><!--TOC subsection Listened Sockets-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc16">3.1.3</A>&#XA0;&#XA0;Listened Sockets</H3><!--SEC END --><P>
<A NAME="listened"></A>
</P><P>The option <TT>listen</TT> defines for which addresses and ports <TT>ejabberd</TT>
will listen and what services will be run on them. Each element of the list is a
tuple with the following elements:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
Port number.
</LI><LI CLASS="li-itemize">Module that serves this port.
</LI><LI CLASS="li-itemize">Options to this module.
</LI></UL><P>
Currently next modules are implemented:
</P><BLOCKQUOTE CLASS="table"><DIV CLASS="center"><DIV CLASS="center"><HR WIDTH="80%" SIZE=2></DIV>

<TABLE BORDER=1 CELLSPACING=0 CELLPADDING=1><TR><TD VALIGN=top ALIGN=left NOWRAP><TT>ejabberd_c2s</TT></TD><TD VALIGN=top ALIGN=left NOWRAP>Description</TD><TD VALIGN=top ALIGN=left>Handles c2s connections.</TD></TR>
<TR><TD VALIGN=top ALIGN=left NOWRAP>&nbsp;</TD><TD VALIGN=top ALIGN=left NOWRAP>Options</TD><TD VALIGN=top ALIGN=left><TT>access</TT>, <TT>certfile</TT>, <TT>inet6</TT>,
<TT>ip</TT>, <TT>max_stanza_size</TT>, <TT>shaper</TT>, <TT>ssl</TT>,
<TT>tls</TT>, <TT>starttls</TT>, <TT>starttls_required</TT>,
<TT>zlib</TT></TD></TR>
<TR><TD VALIGN=top ALIGN=left NOWRAP><TT>ejabberd_s2s_in</TT></TD><TD VALIGN=top ALIGN=left NOWRAP>Description</TD><TD VALIGN=top ALIGN=left>Handles incoming s2s
connections.</TD></TR>
<TR><TD VALIGN=top ALIGN=left NOWRAP>&nbsp;</TD><TD VALIGN=top ALIGN=left NOWRAP>Options</TD><TD VALIGN=top ALIGN=left><TT>inet6</TT>, <TT>ip</TT>,
<TT>max_stanza_size</TT></TD></TR>
<TR><TD VALIGN=top ALIGN=left NOWRAP><TT>ejabberd_service</TT></TD><TD VALIGN=top ALIGN=left NOWRAP>Description</TD><TD VALIGN=top ALIGN=left>Interacts with external
components (*).</TD></TR>
<TR><TD VALIGN=top ALIGN=left NOWRAP>&nbsp;</TD><TD VALIGN=top ALIGN=left NOWRAP>Options</TD><TD VALIGN=top ALIGN=left><TT>access</TT>, <TT>hosts</TT>, <TT>inet6</TT>,
<TT>ip</TT>, <TT>shaper</TT></TD></TR>
<TR><TD VALIGN=top ALIGN=left NOWRAP><TT>ejabberd_http</TT></TD><TD VALIGN=top ALIGN=left NOWRAP>Description</TD><TD VALIGN=top ALIGN=left>Handles incoming HTTP
connections.</TD></TR>
<TR><TD VALIGN=top ALIGN=left NOWRAP>&nbsp;</TD><TD VALIGN=top ALIGN=left NOWRAP>Options</TD><TD VALIGN=top ALIGN=left><TT>certfile</TT>, <TT>http_poll</TT>,
<TT>inet6</TT>, <TT>ip</TT>, <TT>tls</TT>, <TT>web_admin</TT></TD></TR>
</TABLE>
<DIV CLASS="center"><HR WIDTH="80%" SIZE=2></DIV></DIV></BLOCKQUOTE><P>(*) The mechanism for <A HREF="http://ejabberd.jabber.ru/tutorials-transports">external components</A> is defined in Jabber Component Protocol (<A HREF="http://www.xmpp.org/extensions/xep-0114.html">XEP-0114</A>).</P><P>The following options are available:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>{access, &lt;access rule&gt;}</TT></B></DT><DD CLASS="dd-description"> This option defines
access to the port. The default value is <TT>all</TT>.
</DD><DT CLASS="dt-description"><B><TT>{certfile, Path}</TT></B></DT><DD CLASS="dd-description"> Path to a file containing the SSL certificate.
</DD><DT CLASS="dt-description"><B><TT>{hosts, [Hostnames], [HostOptions]}</TT></B></DT><DD CLASS="dd-description"> This option
defines one or more hostnames of connected services and enables you to
specify additional options including <TT>{password, Secret}</TT>.
</DD><DT CLASS="dt-description"><B><TT>http_poll</TT></B></DT><DD CLASS="dd-description"> 
This option enables HTTP Polling (<A HREF="http://www.xmpp.org/extensions/xep-0025.html">XEP-0025</A>) support. HTTP Polling
enables access via HTTP requests to <TT>ejabberd</TT> from behind firewalls which
do not allow outgoing sockets on port 5222.<P>If HTTP Polling is enabled, it will be available at
<CODE>http://server:port/http-poll/</CODE>. Be aware that support for HTTP Polling
is also needed in the Jabber client. Remark also that HTTP Polling can be
interesting to host a web-based Jabber client such as
<A HREF="http://jwchat.sourceforge.net/">JWChat</A> (there is a tutorial to
<A HREF="http://ejabberd.jabber.ru/jwchat">install JWChat</A> with
instructions for <TT>ejabberd</TT>).
</P></DD><DT CLASS="dt-description"><B><TT>inet6</TT></B></DT><DD CLASS="dd-description"> Set up the socket for IPv6.
</DD><DT CLASS="dt-description"><B><TT>{ip, IPAddress}</TT></B></DT><DD CLASS="dd-description"> This option specifies which network
interface to listen for. For example <CODE>{ip, {192, 168, 1, 1}}</CODE>.
</DD><DT CLASS="dt-description"><B><TT>{max_stanza_size, Size}</TT></B></DT><DD CLASS="dd-description"> This
option specifies an approximate maximum size in bytes of XML stanzas.
Approximate, because it is calculated with the precision of one block of
readed data. For example <CODE>{max_stanza_size, 65536}</CODE>. The default
value is <TT>infinity</TT>.
</DD><DT CLASS="dt-description"><B><TT>{shaper, &lt;access rule&gt;}</TT></B></DT><DD CLASS="dd-description"> This option defines a
shaper for the port (see section&#XA0;<A HREF="#shapers">3.1.6</A>). The default value
is <TT>none</TT>.
</DD><DT CLASS="dt-description"><B><TT>ssl</TT></B></DT><DD CLASS="dd-description"> This option specifies that traffic on
the port will be encrypted using SSL. You should also set the
<TT>certfile</TT> option. It is recommended to use the <TT>tls</TT> option
instead.
</DD><DT CLASS="dt-description"><B><TT>starttls</TT></B></DT><DD CLASS="dd-description"> This option
specifies that STARTTLS encryption is available on connections to the port.
You should also set the <TT>certfile</TT> option.
</DD><DT CLASS="dt-description"><B><TT>starttls_required</TT></B></DT><DD CLASS="dd-description"> This option
specifies that STARTTLS encryption is required on connections to the port.
No unencrypted connections will be allowed. You should also set the
<TT>certfile</TT> option.
</DD><DT CLASS="dt-description"><B><TT>tls</TT></B></DT><DD CLASS="dd-description"> This option specifies that traffic on
the port will be encrypted using SSL immediately after connecting. You
should also set the <TT>certfile</TT> option.
</DD><DT CLASS="dt-description"><B><TT>zlib</TT></B></DT><DD CLASS="dd-description"> This
option specifies that Zlib stream compression (as defined in <A HREF="http://www.xmpp.org/extensions/xep-0138.html">XEP-0138</A>)
is available on connections to the port. Client connections cannot use
stream compression and stream encryption simultaneously. Hence, if you
specify both <TT>tls</TT> (or <TT>ssl</TT>) and <TT>zlib</TT>, the latter
option will not affect connections (there will be no stream compression).
</DD><DT CLASS="dt-description"><B><TT>web_admin</TT></B></DT><DD CLASS="dd-description"> This option
enables the web interface for <TT>ejabberd</TT> administration which is available
at <CODE>http://server:port/admin/</CODE>. Login and password are the username and
password of one of the registered users who are granted access by the
`configure' access rule.
</DD></DL><P>In addition, the following options are available for s2s connections:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>{s2s_use_starttls, true|false}</TT></B></DT><DD CLASS="dd-description">
This option defines whether to
use STARTTLS for s2s connections.
</DD><DT CLASS="dt-description"><B><TT>{s2s_certfile, Path}</TT></B></DT><DD CLASS="dd-description"> Path to a
file containing a SSL certificate.
</DD><DT CLASS="dt-description"><B><TT>{domain_certfile, Domain, Path}</TT></B></DT><DD CLASS="dd-description"> Path
to the file containing the SSL certificate for the specified domain.
</DD></DL><P>For instance, the following configuration defines that:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
c2s connections are listened for on port 5222 and 5223 (SSL) and denied
for the user called `<TT>bad</TT>'.
</LI><LI CLASS="li-itemize">s2s connections are listened for on port 5269 with STARTTLS for secured
traffic enabled.
</LI><LI CLASS="li-itemize">Port 5280 is serving the web interface and the HTTP Polling service. Note
that it is also possible to serve them on different ports. The second
example in section&#XA0;<A HREF="#webinterface">4.1.1</A> shows how exactly this can be done.
</LI><LI CLASS="li-itemize">All users except for the administrators have a traffic of limit 
1,000&#XA0;Bytes/second
</LI><LI CLASS="li-itemize">The
<A HREF="http://ejabberd.jabber.ru/pyaimt">AIM transport</A>
<TT>aim.example.org</TT> is connected to port 5233 with password
`<TT>aimsecret</TT>'.
</LI><LI CLASS="li-itemize">The ICQ transport JIT (<TT>icq.example.org</TT> and
<TT>sms.example.org</TT>) is connected to port 5234 with password
`<TT>jitsecret</TT>'.
</LI><LI CLASS="li-itemize">The
<A HREF="http://ejabberd.jabber.ru/pymsnt">MSN transport</A>
<TT>msn.example.org</TT> is connected to port 5235 with password
`<TT>msnsecret</TT>'.
</LI><LI CLASS="li-itemize">The
<A HREF="http://ejabberd.jabber.ru/yahoo-transport-2">Yahoo! transport</A>
<TT>yahoo.example.org</TT> is connected to port 5236 with password
`<TT>yahoosecret</TT>'.
</LI><LI CLASS="li-itemize">The <A HREF="http://ejabberd.jabber.ru/jabber-gg-transport">Gadu-Gadu transport</A> <TT>gg.example.org</TT> is
connected to port 5237 with password `<TT>ggsecret</TT>'.
</LI><LI CLASS="li-itemize">The
<A HREF="http://ejabberd.jabber.ru/jmc">Jabber Mail Component</A>
<TT>jmc.example.org</TT> is connected to port 5238 with password
`<TT>jmcsecret</TT>'.
</LI></UL><PRE CLASS="verbatim">  {acl, blocked, {user, "bad"}}.
  {access, c2s, [{deny, blocked},
                 {allow, all}]}.
  {shaper, normal, {maxrate, 1000}}.
  {access, c2s_shaper, [{none, admin},
                        {normal, all}]}.
  {listen,
   [{5222, ejabberd_c2s,     [{access, c2s}, {shaper, c2s_shaper}]},
    {5223, ejabberd_c2s,     [{access, c2s},
                              ssl, {certfile, "/path/to/ssl.pem"}]},
    {5269, ejabberd_s2s_in,  []},
    {5280, ejabberd_http,    [http_poll, web_admin]},
    {5233, ejabberd_service, [{host, "aim.example.org",
                               [{password, "aimsecret"}]}]},
    {5234, ejabberd_service, [{hosts, ["icq.example.org", "sms.example.org"],
                               [{password, "jitsecret"}]}]},
    {5235, ejabberd_service, [{host, "msn.example.org",
                               [{password, "msnsecret"}]}]},
    {5236, ejabberd_service, [{host, "yahoo.example.org",
                               [{password, "yahoosecret"}]}]},
    {5237, ejabberd_service, [{host, "gg.example.org",
                               [{password, "ggsecret"}]}]},
    {5238, ejabberd_service, [{host, "jmc.example.org",
                               [{password, "jmcsecret"}]}]}
   ]
  }.
  {s2s_use_starttls, true}.
  {s2s_certfile, "/path/to/ssl.pem"}.
</PRE><P>Note, that for jabberd 1.4- or WPJabber-based
services you have to make the transports log and do XDB by themselves:
</P><PRE CLASS="verbatim">  &lt;!--
     You have to add elogger and rlogger entries here when using ejabberd.
     In this case the transport will do the logging.
  --&gt;

  &lt;log id='logger'&gt;
    &lt;host/&gt;
    &lt;logtype/&gt;
    &lt;format&gt;%d: [%t] (%h): %s&lt;/format&gt;
    &lt;file&gt;/var/log/jabber/service.log&lt;/file&gt;
  &lt;/log&gt;

  &lt;!--
     Some Jabber server implementations do not provide
     XDB services (for example, jabberd2 and ejabberd).
     xdb_file.so is loaded in to handle all XDB requests.
  --&gt;

  &lt;xdb id="xdb"&gt;
    &lt;host/&gt;
    &lt;load&gt;
      &lt;!-- this is a lib of wpjabber or jabberd --&gt;
      &lt;xdb_file&gt;/usr/lib/jabber/xdb_file.so&lt;/xdb_file&gt;
      &lt;/load&gt;
    &lt;xdb_file xmlns="jabber:config:xdb_file"&gt;
      &lt;spool&gt;&lt;jabberd:cmdline flag='s'&gt;/var/spool/jabber&lt;/jabberd:cmdline&gt;&lt;/spool&gt;
    &lt;/xdb_file&gt;
  &lt;/xdb&gt;
</PRE><!--TOC subsection Authentication-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc17">3.1.4</A>&#XA0;&#XA0;Authentication</H3><!--SEC END --><P>
<A NAME="auth"></A>
</P><P>The option <TT>auth_method</TT> defines the authentication method that is used
for user authentication:
</P><PRE CLASS="verbatim">  {auth_method, [&lt;method&gt;]}.
</PRE><P>The following authentication methods are supported by <TT>ejabberd</TT>:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
internal (default) &#X2014; See section&#XA0;<A HREF="#internalauth">3.1.4</A>.
</LI><LI CLASS="li-itemize">external &#X2014; There are <A HREF="http://ejabberd.jabber.ru/extauth">some
example authentication scripts</A>.
</LI><LI CLASS="li-itemize">ldap &#X2014; See section&#XA0;<A HREF="#ldap">3.2.5</A>.
</LI><LI CLASS="li-itemize">odbc &#X2014; See section&#XA0;<A HREF="#mysql">3.2.1</A>, <A HREF="#pgsql">3.2.3</A>,
<A HREF="#mssql">3.2.2</A> and <A HREF="#odbc">3.2.4</A>.
</LI><LI CLASS="li-itemize">anonymous &#X2014; See section&#XA0;<A HREF="#saslanonymous">3.1.4</A>.
</LI></UL><!--TOC subsubsection Internal-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Internal</H4><!--SEC END --><P>
<A NAME="internalauth"></A>
</P><P><TT>ejabberd</TT> uses its internal Mnesia database as the default authentication method.</P><UL CLASS="itemize"><LI CLASS="li-itemize">
<TT>auth_method</TT>: The value <TT>internal</TT> will enable the internal
authentication method.
</LI></UL><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
To use internal authentication on <TT>example.org</TT> and LDAP
authentication on <TT>example.net</TT>:
<PRE CLASS="verbatim">{host_config, "example.org", [{auth_method, [internal]}]}.
{host_config, "example.net", [{auth_method, [ldap]}]}.
</PRE></LI><LI CLASS="li-itemize">To use internal authentication on all virtual hosts:
<PRE CLASS="verbatim">{auth_method, internal}.
</PRE></LI></UL><!--TOC subsubsection SASL Anonymous and Anonymous Login-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->SASL Anonymous and Anonymous Login</H4><!--SEC END --><P>
<A NAME="saslanonymous"></A>
</P><P>The anonymous authentication method can be configured with the following
options. Remember that you can use the <TT>host_config</TT> option to set virtual
host specific options (see section&#XA0;<A HREF="#virtualhost">3.1.2</A>). Note that there also
is a detailed tutorial regarding <A HREF="http://support.process-one.net/doc/display/MESSENGER/Anonymous+users+support">SASL
Anonymous and anonymous login configuration</A>.</P><UL CLASS="itemize"><LI CLASS="li-itemize">
<TT>auth_method</TT>: The value <TT>anonymous</TT> will enable the anonymous
authentication method.
</LI><LI CLASS="li-itemize"><TT>allow_multiple_connections</TT>: This value for this option can be
either <TT>true</TT> or <TT>false</TT> and is only used when the anonymous mode is
enabled. Setting it to <TT>true</TT> means that the same username can be taken
multiple times in anonymous login mode if different resource are used to
connect. This option is only useful in very special occasions. The default
value is <TT>false</TT>.
</LI><LI CLASS="li-itemize"><TT>anonymous_protocol</TT>: This option can take three values:
<TT>sasl_anon</TT>, <TT>login_anon</TT> or <TT>both</TT>. <TT>sasl_anon</TT> means
that the SASL Anonymous method will be used. <TT>login_anon</TT> means that the
anonymous login method will be used. <TT>both</TT> means that SASL Anonymous and
login anonymous are both enabled.
</LI></UL><P>Those options are defined for each virtual host with the <TT>host_config</TT>
parameter (see section&#XA0;<A HREF="#virtualhost">3.1.2</A>).</P><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
To enable anonymous login on all virtual hosts:
<PRE CLASS="verbatim">{auth_method, [anonymous]}.
{anonymous_protocol, login_anon}.
  </PRE></LI><LI CLASS="li-itemize">Similar as previous example, but limited to <TT>public.example.org</TT>:
<PRE CLASS="verbatim">{host_config, "public.example.org", [{auth_method, [anonymous]},
                                     {anonymous_protocol, login_anon}]}.
</PRE></LI><LI CLASS="li-itemize">To enable anonymous login and internal authentication on a virtual host:
<PRE CLASS="verbatim">{host_config, "public.example.org", [{auth_method, [internal,anonymous]},
                                     {anonymous_protocol, login_anon}]}.
</PRE></LI><LI CLASS="li-itemize">To enable SASL Anonymous on a virtual host:
<PRE CLASS="verbatim">{host_config, "public.example.org", [{auth_method, [anonymous]},
                                     {anonymous_protocol, sasl_anon}]}.
</PRE></LI><LI CLASS="li-itemize">To enable SASL Anonymous and anonymous login on a virtual host:
<PRE CLASS="verbatim">{host_config, "public.example.org", [{auth_method, [anonymous]},
                                     {anonymous_protocol, both}]}.
</PRE></LI><LI CLASS="li-itemize">To enable SASL Anonymous, anonymous login, and internal authentication on
a virtual host:
<PRE CLASS="verbatim">{host_config, "public.example.org", [{auth_method, [internal,anonymous]},
                                     {anonymous_protocol, both}]}.
</PRE></LI></UL><!--TOC subsection Access Rules-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc18">3.1.5</A>&#XA0;&#XA0;Access Rules</H3><!--SEC END --><P>
<A NAME="accessrules"></A>
</P><!--TOC subsubsection ACL Definition-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->ACL Definition</H4><!--SEC END --><P>
<A NAME="ACLDefinition"></A>
</P><P>Access control in <TT>ejabberd</TT> is performed via Access Control Lists (ACLs). The
declarations of ACLs in the configuration file have the following syntax:
</P><PRE CLASS="verbatim">  {acl, &lt;aclname&gt;, {&lt;acltype&gt;, ...}}.
</PRE><P><TT>&lt;acltype&gt;</TT> can be one of the following:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>all</TT></B></DT><DD CLASS="dd-description"> Matches all JIDs. Example:
<PRE CLASS="verbatim">{acl, all, all}.
</PRE></DD><DT CLASS="dt-description"><B><TT>{user, &lt;username&gt;}</TT></B></DT><DD CLASS="dd-description"> Matches the user with the name
<TT>&lt;username&gt;</TT> at the first virtual host. Example:
<PRE CLASS="verbatim">{acl, admin, {user, "yozhik"}}.
</PRE></DD><DT CLASS="dt-description"><B><TT>{user, &lt;username&gt;, &lt;server&gt;}</TT></B></DT><DD CLASS="dd-description"> Matches the user with the JID
<TT>&lt;username&gt;@&lt;server&gt;</TT> and any resource. Example:
<PRE CLASS="verbatim">{acl, admin, {user, "yozhik", "example.org"}}.
</PRE></DD><DT CLASS="dt-description"><B><TT>{server, &lt;server&gt;}</TT></B></DT><DD CLASS="dd-description"> Matches any JID from server
<TT>&lt;server&gt;</TT>. Example:
<PRE CLASS="verbatim">{acl, exampleorg, {server, "example.org"}}.
</PRE></DD><DT CLASS="dt-description"><B><TT>{user_regexp, &lt;regexp&gt;}</TT></B></DT><DD CLASS="dd-description"> Matches any local user with a name that
matches <TT>&lt;regexp&gt;</TT> at the first virtual host. Example:
<PRE CLASS="verbatim">{acl, tests, {user_regexp, "^test[0-9]*$"}}.
</PRE></DD><DT CLASS="dt-description"><B><TT>{user_regexp, &lt;regexp&gt;, &lt;server&gt;}</TT></B></DT><DD CLASS="dd-description"> Matches any user with a name
that matches <TT>&lt;regexp&gt;</TT> at server <TT>&lt;server&gt;</TT>. Example:
<PRE CLASS="verbatim">{acl, tests, {user_regexp, "^test", "example.org"}}.
</PRE></DD><DT CLASS="dt-description"><B><TT>{server_regexp, &lt;regexp&gt;}</TT></B></DT><DD CLASS="dd-description"> Matches any JID from the server that
matches <TT>&lt;regexp&gt;</TT>. Example:
<PRE CLASS="verbatim">{acl, icq, {server_regexp, "^icq\\."}}.
</PRE></DD><DT CLASS="dt-description"><B><TT>{node_regexp, &lt;user_regexp&gt;, &lt;server_regexp&gt;}</TT></B></DT><DD CLASS="dd-description"> Matches any user
with a name that matches <TT>&lt;user_regexp&gt;</TT> at any server that matches
<TT>&lt;server_regexp&gt;</TT>. Example:
<PRE CLASS="verbatim">{acl, yohzik, {node_regexp, "^yohzik$", "^example.(com|org)$"}}.
</PRE></DD><DT CLASS="dt-description"><B><TT>{user_glob, &lt;glob&gt;}</TT></B></DT><DD CLASS="dd-description">
</DD><DT CLASS="dt-description"><B><TT>{user_glob, &lt;glob&gt;, &lt;server&gt;}</TT></B></DT><DD CLASS="dd-description">
</DD><DT CLASS="dt-description"><B><TT>{server_glob, &lt;glob&gt;}</TT></B></DT><DD CLASS="dd-description">
</DD><DT CLASS="dt-description"><B><TT>{node_glob, &lt;user_glob&gt;, &lt;server_glob&gt;}</TT></B></DT><DD CLASS="dd-description"> This is the same as
above. However, it uses shell glob patterns instead of regexp. These patterns
can have the following special characters:
<DL CLASS="description"><DT CLASS="dt-description">
<B><TT>*</TT></B></DT><DD CLASS="dd-description"> matches any string including the null string.
</DD><DT CLASS="dt-description"><B><TT>?</TT></B></DT><DD CLASS="dd-description"> matches any single character.
</DD><DT CLASS="dt-description"><B><TT>[...]</TT></B></DT><DD CLASS="dd-description"> matches any of the enclosed characters. Character
ranges are specified by a pair of characters separated by a <TT>`-'</TT>.
If the first character after <TT>`['</TT> is a <TT>`!'</TT>, any
character not enclosed is matched.
</DD></DL>
</DD></DL><P>The following ACLs are pre-defined:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>all</TT></B></DT><DD CLASS="dd-description"> Matches any JID.
</DD><DT CLASS="dt-description"><B><TT>none</TT></B></DT><DD CLASS="dd-description"> Matches no JID.
</DD></DL><!--TOC subsubsection Access Rights-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Access Rights</H4><!--SEC END --><P>
<A NAME="AccessRights"></A>
</P><P>An entry allowing or denying access to different services looks similar to
this:
</P><PRE CLASS="verbatim">  {access, &lt;accessname&gt;, [{allow, &lt;aclname&gt;},
                          {deny, &lt;aclname&gt;},
                          ...
                         ]}.
</PRE><P>When a JID is checked to have access to <TT>&lt;accessname&gt;</TT>, the server
sequentially checks if that JID mathes any of the ACLs that are named in the
second elements of the tuples in the list. If it matches, the first element of
the first matched tuple is returned, otherwise the value `<TT>deny</TT>' is
returned.</P><P>Example:
</P><PRE CLASS="verbatim">  {access, configure, [{allow, admin}]}.
  {access, something, [{deny, badmans},
                       {allow, all}]}.
</PRE><P>The following access rules are pre-defined:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>all</TT></B></DT><DD CLASS="dd-description"> Always returns the value `<TT>allow</TT>'.
</DD><DT CLASS="dt-description"><B><TT>none</TT></B></DT><DD CLASS="dd-description"> Always returns the value `<TT>deny</TT>'.
</DD></DL><!--TOC subsubsection Limiting Opened Sessions with ACL-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Limiting Opened Sessions with ACL</H4><!--SEC END --><P>
<A NAME="configmaxsessions"></A>
</P><P>The special access <TT>max_user_sessions</TT> specifies the maximum number of sessions (authenticated
connections) per user. If a user tries to open more sessions by using different
resources, the first opened session will be disconnected. The error
<TT>session replaced</TT> will be sent to the disconnected session. The value
for this option can be either a number, or <TT>infinity</TT>. The default
value is <TT>infinity</TT>.</P><P>The syntax is:
</P><PRE CLASS="verbatim">  {access, max_user_sessions, [{&lt;maxnumber&gt;, &lt;aclname&gt;},
                               ...
                              ]}.
</PRE><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
To limit the number of sessions per user to 10 for all users:
<PRE CLASS="verbatim">  {access, max_user_sessions, [{10, all}]}.
</PRE></LI></UL><!--TOC subsection Shapers-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc19">3.1.6</A>&#XA0;&#XA0;Shapers</H3><!--SEC END --><P>
<A NAME="shapers"></A>
</P><P>Shapers enable you to limit connection traffic. The syntax of
shapers is like this:
</P><PRE CLASS="verbatim">  {shaper, &lt;shapername&gt;, &lt;kind&gt;}.
</PRE><P>Currently only one kind of shaper called <TT>maxrate</TT> is available. It has the
following syntax:
</P><PRE CLASS="verbatim">  {maxrate, &lt;rate&gt;}
</PRE><P>where <TT>&lt;rate&gt;</TT> stands for the maximum allowed incomig rate in bytes per
second.</P><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
To define a shaper named `<TT>normal</TT>' with traffic speed limited to
1,000&#XA0;bytes/second:
<PRE CLASS="verbatim">  {shaper, normal, {maxrate, 1000}}.
</PRE></LI><LI CLASS="li-itemize">To define a shaper named `<TT>fast</TT>' with traffic speed limited to
50,000&#XA0;bytes/second:
<PRE CLASS="verbatim">  {shaper, fast, {maxrate, 50000}}.
</PRE></LI></UL><!--TOC subsection Default Language-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc20">3.1.7</A>&#XA0;&#XA0;Default Language</H3><!--SEC END --><P>
<A NAME="language"></A>
</P><P>The option <TT>language</TT> defines the default language of server strings that
can be seen by Jabber clients. If a Jabber client do not support
<TT>xml:lang</TT>, the specified language is used. The default value is
<TT>en</TT>. In order to take effect there must be a translation file
<TT>&lt;language&gt;.msg</TT> in <TT>ejabberd</TT>'s <TT>msgs</TT> directory.</P><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
To set Russian as default language:
<PRE CLASS="verbatim">  {language, "ru"}.
</PRE></LI><LI CLASS="li-itemize">To set Spanish as default language:
<PRE CLASS="verbatim">  {language, "es"}.
</PRE></LI></UL><!--TOC section Database and LDAP Configuration-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc21">3.2</A>&#XA0;&#XA0;Database and LDAP Configuration</H2><!--SEC END --><P>
<A NAME="database"></A>

</P><P><TT>ejabberd</TT> uses its internal Mnesia database by default. However, it is
possible to use a relational database or an LDAP server to store persistant,
long-living data. <TT>ejabberd</TT> is very flexible: you can configure different
authentication methods for different virtual hosts, you can configure different
authentication mechanisms for the same virtual host (fallback), you can set
different storage systems for modules, and so forth.</P><P>The following databases are supported by <TT>ejabberd</TT>:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
<A HREF="http://www.microsoft.com/sql/">Microsoft SQL Server</A>
</LI><LI CLASS="li-itemize"><A HREF="http://www.erlang.org/doc/doc-5.5.1/lib/mnesia-4.3.2/doc/">Mnesia</A>
</LI><LI CLASS="li-itemize"><A HREF="http://mysql.com/">MySQL</A>
</LI><LI CLASS="li-itemize"><A HREF="http://en.wikipedia.org/wiki/Open_Database_Connectivity">Any ODBC compatible database</A>
</LI><LI CLASS="li-itemize"><A HREF="http://www.postgresql.org/">PostgreSQL</A>
</LI></UL><P>The following LDAP servers are tested with <TT>ejabberd</TT>:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
<A HREF="http://www.microsoft.com/activedirectory/">Active Directory</A>
(see section&#XA0;<A HREF="#ad">3.2.5</A>)
</LI><LI CLASS="li-itemize"><A HREF="http://www.openldap.org/">OpenLDAP</A>
</LI><LI CLASS="li-itemize">Normally any LDAP compatible server should work; inform us about your
success with a not-listed server so that we can list it here.
</LI></UL><!--TOC subsection MySQL-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc22">3.2.1</A>&#XA0;&#XA0;MySQL</H3><!--SEC END --><P>
<A NAME="mysql"></A>
</P><P>Although this section will describe <TT>ejabberd</TT>'s configuration when you want to
use the native MySQL driver, it does not describe MySQL's installation and
database creation. Check the MySQL documentation and the tutorial <A HREF="http://support.process-one.net/doc/display/MESSENGER/Using+ejabberd+with+MySQL+native+driver">Using ejabberd with MySQL native driver</A> for information regarding these topics.
Note that the tutorial contains information about <TT>ejabberd</TT>'s configuration
which is duplicate to this section.</P><P>Moreover, the file mysql.sql in the directory src/odbc might be interesting for
you. This file contains the ejabberd schema for MySQL. At the end of the file
you can find information to update your database schema.</P><!--TOC subsubsection Driver Compilation-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Driver Compilation</H4><!--SEC END --><P>
<A NAME="compilemysql"></A>
</P><P>You can skip this step if you installed <TT>ejabberd</TT> using a binary installer or
if the binary packages of <TT>ejabberd</TT> you are using include support for MySQL.</P><OL CLASS="enumerate" type=1><LI CLASS="li-enumerate">
First, install the <A HREF="http://support.process-one.net/doc/display/CONTRIBS/Yxa">Erlang
MySQL library</A>. Make sure the compiled files are in your Erlang path; you can
put them for example in the same directory as your ejabberd .beam files.
</LI><LI CLASS="li-enumerate">Then, configure and install <TT>ejabberd</TT> with ODBC support enabled (this is
also needed for native MySQL support!). This can be done, by using next
commands:
<PRE CLASS="verbatim">./configure --enable-odbc &amp;&amp; make install
</PRE></LI></OL><!--TOC subsubsection Authentication-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Authentication</H4><!--SEC END --><P>
<A NAME="mysqlauth"></A>
</P><P>The option value name may be misleading, as the <TT>auth_method</TT> name is used
for access to a relational database through ODBC, as well as through the native
MySQL interface. Anyway, the first configuration step is to define the odbc
<TT>auth_method</TT>. For example:
</P><PRE CLASS="verbatim">{host_config, "public.example.org", [{auth_method, [odbc]}]}.
</PRE><P>The actual database access is defined in the option <TT>odbc_server</TT>. Its
value is used to define if we want to use ODBC, or one of the two native
interface available, PostgreSQL or MySQL.</P><P>To use the native MySQL interface, you can pass a tuple of the following form as
parameter:
</P><PRE CLASS="verbatim">{mysql, "Server", "Database", "Username", "Password"}
</PRE><P><TT>mysql</TT> is a keyword that should be kept as is. For example:
</P><PRE CLASS="verbatim">{odbc_server, {mysql, "localhost", "test", "root", "password"}}.
</PRE><P>Optionally, it is possible to define the MySQL port to use. This
option is only useful, in very rare cases, when you are not running
MySQL with the default port setting. The <TT>mysql</TT> parameter
can thus take the following form:
</P><PRE CLASS="verbatim">{mysql, "Server", Port, "Database", "Username", "Password"}
</PRE><P>The <TT>Port</TT> value should be an integer, without quotes. For example:
</P><PRE CLASS="verbatim">{odbc_server, {mysql, "localhost", Port, "test", "root", "password"}}.
</PRE><!--TOC subsubsection Storage-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Storage</H4><!--SEC END --><P>
<A NAME="mysqlstorage"></A>
</P><P>MySQL also can be used to store information into from several <TT>ejabberd</TT>
modules. See section&#XA0;<A HREF="#modoverview">3.3.1</A> to see which modules have a version
with the `_odbc'. This suffix indicates that the module can be used with
relational databases like MySQL. To enable storage to your database, just make
sure that your database is running well (see previous sections), and replace the
suffix-less or ldap module variant with the odbc module variant. Keep in mind
that you cannot have several variants of the same module loaded!</P><!--TOC subsection Microsoft SQL Server-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc23">3.2.2</A>&#XA0;&#XA0;Microsoft SQL Server</H3><!--SEC END --><P>
<A NAME="mssql"></A>
</P><P>Although this section will describe <TT>ejabberd</TT>'s configuration when you want to
use Microsoft SQL Server, it does not describe Microsoft SQL Server's
installation and database creation. Check the MySQL documentation and the
tutorial <A HREF="http://support.process-one.net/doc/display/MESSENGER/Using+ejabberd+with+MySQL+native+driver">Using ejabberd with MySQL native driver</A> for information regarding these topics.
Note that the tutorial contains information about <TT>ejabberd</TT>'s configuration
which is duplicate to this section.</P><P>Moreover, the file mssql.sql in the directory src/odbc might be interesting for
you. This file contains the ejabberd schema for Microsoft SQL Server. At the end
of the file you can find information to update your database schema.</P><!--TOC subsubsection Driver Compilation-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Driver Compilation</H4><!--SEC END --><P>
<A NAME="compilemssql"></A>
</P><P>You can skip this step if you installed <TT>ejabberd</TT> using a binary installer or
if the binary packages of <TT>ejabberd</TT> you are using include support for ODBC.</P><P>If you want to use Microsoft SQL Server with ODBC, you need to configure,
compile and install <TT>ejabberd</TT> with support for ODBC and Microsoft SQL Server
enabled. This can be done, by using next commands:
</P><PRE CLASS="verbatim">./configure --enable-odbc --enable-mssql &amp;&amp; make install
</PRE><!--TOC subsubsection Authentication-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Authentication</H4><!--SEC END --><P>
<A NAME="mssqlauth"></A>
</P><P>The configuration of Microsoft SQL Server is the same as the configuration of
ODBC compatible serers (see section&#XA0;<A HREF="#odbcauth">3.2.4</A>).</P><!--TOC subsubsection Storage-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Storage</H4><!--SEC END --><P>
<A NAME="mssqlstorage"></A>
</P><P>Microsoft SQL Server also can be used to store information into from several
<TT>ejabberd</TT> modules. See section&#XA0;<A HREF="#modoverview">3.3.1</A> to see which modules have
a version with the `_odbc'. This suffix indicates that the module can be used
with relational databases like Microsoft SQL Server. To enable storage to your
database, just make sure that your database is running well (see previous
sections), and replace the suffix-less or ldap module variant with the odbc
module variant. Keep in mind that you cannot have several variants of the same
module loaded!</P><!--TOC subsection PostgreSQL-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc24">3.2.3</A>&#XA0;&#XA0;PostgreSQL</H3><!--SEC END --><P>
<A NAME="pgsql"></A>
</P><P>Although this section will describe <TT>ejabberd</TT>'s configuration when you want to
use the native PostgreSQL driver, it does not describe PostgreSQL's installation
and database creation. Check the PostgreSQL documentation and the tutorial <A HREF="http://support.process-one.net/doc/display/MESSENGER/Using+ejabberd+with+MySQL+native+driver">Using ejabberd with MySQL native driver</A> for information regarding these topics.
Note that the tutorial contains information about <TT>ejabberd</TT>'s configuration
which is duplicate to this section.</P><P>Also the file pg.sql in the directory src/odbc might be interesting for you.
This file contains the ejabberd schema for PostgreSQL. At the end of the file
you can find information to update your database schema.</P><!--TOC subsubsection Driver Compilation-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Driver Compilation</H4><!--SEC END --><P>
<A NAME="compilepgsql"></A>
</P><P>You can skip this step if you installed <TT>ejabberd</TT> using a binary installer or
if the binary packages of <TT>ejabberd</TT> you are using include support for
PostgreSQL.</P><OL CLASS="enumerate" type=1><LI CLASS="li-enumerate">
First, install the Erlang PgSQL library from
<A HREF="http://jungerl.sourceforge.net/">Jungerl</A>. Make sure the compiled
files are in your Erlang path; you can put them for example in the same
directory as your ejabberd .beam files.
</LI><LI CLASS="li-enumerate">Then, configure, compile and install <TT>ejabberd</TT> with ODBC support enabled
(this is also needed for native PostgreSQL support!). This can be done, by
using next commands:
<PRE CLASS="verbatim">./configure --enable-odbc &amp;&amp; make install
</PRE></LI></OL><!--TOC subsubsection Authentication-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Authentication</H4><!--SEC END --><P>
<A NAME="pgsqlauth"></A>
</P><P>The option value name may be misleading, as the <TT>auth_method</TT> name is used
for access to a relational database through ODBC, as well as through the native
PostgreSQL interface. Anyway, the first configuration step is to define the odbc
<TT>auth_method</TT>. For example:
</P><PRE CLASS="verbatim">{host_config, "public.example.org", [{auth_method, [odbc]}]}.
</PRE><P>The actual database access is defined in the option <TT>odbc_server</TT>. Its
value is used to define if we want to use ODBC, or one of the two native
interface available, PostgreSQL or MySQL.</P><P>To use the native PostgreSQL interface, you can pass a tuple of the following
form as parameter:
</P><PRE CLASS="verbatim">{pgsql, "Server", "Database", "Username", "Password"}
</PRE><P><TT>pgsql</TT> is a keyword that should be kept as is. For example:
</P><PRE CLASS="verbatim">{odbc_server, {pgsql, "localhost", "database", "ejabberd", "password"}}.
</PRE><P>Optionally, it is possible to define the PostgreSQL port to use. This
option is only useful, in very rare cases, when you are not running
PostgreSQL with the default port setting. The <TT>pgsql</TT> parameter
can thus take the following form:
</P><PRE CLASS="verbatim">{pgsql, "Server", Port, "Database", "Username", "Password"}
</PRE><P>The <TT>Port</TT> value should be an integer, without quotes. For example:
</P><PRE CLASS="verbatim">{odbc_server, {pgsql, "localhost", 5432, "database", "ejabberd", "password"}}.
</PRE><!--TOC subsubsection Storage-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Storage</H4><!--SEC END --><P>
<A NAME="pgsqlstorage"></A>
</P><P>PostgreSQL also can be used to store information into from several <TT>ejabberd</TT>
modules. See section&#XA0;<A HREF="#modoverview">3.3.1</A> to see which modules have a version
with the `_odbc'. This suffix indicates that the module can be used with
relational databases like PostgreSQL. To enable storage to your database, just
make sure that your database is running well (see previous sections), and
replace the suffix-less or ldap module variant with the odbc module variant.
Keep in mind that you cannot have several variants of the same module loaded!</P><!--TOC subsection ODBC Compatible-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc25">3.2.4</A>&#XA0;&#XA0;ODBC Compatible</H3><!--SEC END --><P>
<A NAME="odbc"></A>
</P><P>Although this section will describe <TT>ejabberd</TT>'s configuration when you want to
use the ODBC driver, it does not describe the installation and database creation
of your database. Check the documentation of your database. The tutorial <A HREF="http://support.process-one.net/doc/display/MESSENGER/Using+ejabberd+with+MySQL+native+driver">Using ejabberd with MySQL native driver</A> also can help you. Note that the tutorial
contains information about <TT>ejabberd</TT>'s configuration which is duplicate to
this section.</P><!--TOC subsubsection Compilation-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Compilation</H4><!--SEC END --><P>
<A NAME="compileodbc"></A></P><P>You can skip this step if you installed <TT>ejabberd</TT> using a binary installer or
if the binary packages of <TT>ejabberd</TT> you are using include support for
ODBC.</P><OL CLASS="enumerate" type=1><LI CLASS="li-enumerate">
First, install the <A HREF="http://support.process-one.net/doc/display/CONTRIBS/Yxa">Erlang
MySQL library</A>. Make sure the compiled files are in your Erlang path; you can
put them for example in the same directory as your ejabberd .beam files.
</LI><LI CLASS="li-enumerate">Then, configure, compile and install <TT>ejabberd</TT> with ODBC support
enabled. This can be done, by using next commands:
<PRE CLASS="verbatim">./configure --enable-odbc &amp;&amp; make install
</PRE></LI></OL><!--TOC subsubsection Authentication-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Authentication</H4><!--SEC END --><P>
<A NAME="odbcauth"></A>
</P><P>The first configuration step is to define the odbc <TT>auth_method</TT>. For
example:
</P><PRE CLASS="verbatim">{host_config, "public.example.org", [{auth_method, [odbc]}]}.
</PRE><P>The actual database access is defined in the option <TT>odbc_server</TT>. Its
value is used to defined if we want to use ODBC, or one of the two native
interface available, PostgreSQL or MySQL.</P><P>To use a relational database through ODBC, you can pass the ODBC connection
string as <TT>odbc_server</TT> parameter. For example:
</P><PRE CLASS="verbatim">{odbc_server, "DSN=database;UID=ejabberd;PWD=password"}.
</PRE><!--TOC subsubsection Storage-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Storage</H4><!--SEC END --><P>
<A NAME="odbcstorage"></A>
</P><P>An ODBC compatible database also can be used to store information into from
several <TT>ejabberd</TT> modules. See section&#XA0;<A HREF="#modoverview">3.3.1</A> to see which
modules have a version with the `_odbc'. This suffix indicates that the module
can be used with ODBC compatible relational databases. To enable storage to your
database, just make sure that your database is running well (see previous
sections), and replace the suffix-less or ldap module variant with the odbc
module variant. Keep in mind that you cannot have several variants of the same
module loaded!</P><!--TOC subsection LDAP-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc26">3.2.5</A>&#XA0;&#XA0;LDAP</H3><!--SEC END --><P>
<A NAME="ldap"></A>
</P><P><TT>ejabberd</TT> has built-in LDAP support. You can authenticate users against LDAP
server and use LDAP directory as vCard storage. Shared rosters are not supported
yet.</P><!--TOC subsubsection Connection-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Connection</H4><!--SEC END --><P>
<A NAME="ldapconnection"></A></P><P>Parameters:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>ldap_server</TT></B></DT><DD CLASS="dd-description"> IP address or dns name of your
LDAP server. This option is required.
</DD><DT CLASS="dt-description"><B><TT>ldap_port</TT></B></DT><DD CLASS="dd-description"> Port to connect to your LDAP server.
The default value is&#XA0;389.
</DD><DT CLASS="dt-description"><B><TT>ldap_rootdn</TT></B></DT><DD CLASS="dd-description"> Bind DN. The default value
is&#XA0;<TT>""</TT> which means `anonymous connection'.
</DD><DT CLASS="dt-description"><B><TT>ldap_password</TT></B></DT><DD CLASS="dd-description"> Bind password. The default
value is <TT>""</TT>.
</DD></DL><P>Example:
</P><PRE CLASS="verbatim">  {auth_method, ldap}.
  {ldap_servers, ["ldap.example.org"]}.
  {ldap_port, 389}.
  {ldap_rootdn, "cn=Manager,dc=domain,dc=org"}.
  {ldap_password, "secret"}.
</PRE><P>Note that current LDAP implementation does not support SSL secured communication
and SASL authentication.</P><!--TOC subsubsection Authentication-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Authentication</H4><!--SEC END --><P>
<A NAME="ldapauth"></A></P><P>You can authenticate users against an LDAP directory. Available options are:</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>ldap_base</TT></B></DT><DD CLASS="dd-description">LDAP base directory which stores
users accounts. This option is required.
</DD><DT CLASS="dt-description"><B><TT>ldap_uids</TT></B></DT><DD CLASS="dd-description">LDAP attribute which holds a list
of attributes to use as alternatives for getting the JID. The value is of
the form: <TT>[{ldap_uidattr}]</TT> or <TT>[{ldap_uidattr,
ldap_uidattr_format}]</TT>. You can use as many comma separated tuples
<TT>{ldap_uidattr, ldap_uidattr_format}</TT> that is needed. The default
value is <TT>[{"uid", "%u"}]</TT>. The defaut <TT>ldap_uidattr_format</TT>
is <TT>"%u"</TT>. The values for <TT>ldap_uidattr</TT> and
<TT>ldap_uidattr_format</TT> are described as follow:
<DL CLASS="description"><DT CLASS="dt-description">
<B><TT>ldap_uidattr</TT></B></DT><DD CLASS="dd-description">LDAP attribute which holds
the user's part of a JID. The default value is <TT>"uid"</TT>.
</DD><DT CLASS="dt-description"><B><TT>ldap_uidattr_format</TT></B></DT><DD CLASS="dd-description">Format of
the <TT>ldap_uidattr</TT> variable. The format <EM>must</EM> contain one and
only one pattern variable <TT>"%u"</TT> which will be replaced by the
user's part of a JID. For example, <TT>"%u@example.org"</TT>. The default
value is <TT>"%u"</TT>.
</DD></DL>
</DD><DT CLASS="dt-description"><B><TT>ldap_filter</TT></B></DT><DD CLASS="dd-description">
<A HREF="http://www.faqs.org/rfcs/rfc2254.html">RFC 2254</A> LDAP filter. The
default is <TT>none</TT>. Example:
<TT>"(&amp;(objectClass=shadowAccount)(memberOf=Jabber Users))"</TT>. Please, do
not forget to close brackets and do not use superfluous whitespaces. Also you
<EM>must not</EM> use <TT>ldap_uidattr</TT> attribute in filter because this
attribute will be substituted in LDAP filter automatically.
</DD></DL><!--TOC subsubsection Examples-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Examples</H4><!--SEC END --><P>
<A NAME="ldapexamples"></A></P><!--TOC paragraph Common example-->
<H5 CLASS="paragraph"><!--SEC ANCHOR --><A NAME="ldapcommonexample">Common example</A></H5><!--SEC END --><P>Let's say <TT>ldap.example.org</TT> is the name of our LDAP server. We have
users with their passwords in <TT>"ou=Users,dc=example,dc=org"</TT> directory.
Also we have addressbook, which contains users emails and their additional
infos in <TT>"ou=AddressBook,dc=example,dc=org"</TT> directory. Corresponding
authentication section should looks like this:</P><PRE CLASS="verbatim">  %% authentication method
  {auth_method, ldap}.
  %% DNS name of our LDAP server
  {ldap_servers, ["ldap.example.org"]}.
  %% Bind to LDAP server as "cn=Manager,dc=example,dc=org" with password "secret"
  {ldap_rootdn, "cn=Manager,dc=example,dc=org"}.
  {ldap_password, "secret"}.
  %% define the user's base
  {ldap_base, "ou=Users,dc=example,dc=org"}.
  %% We want to authorize users from 'shadowAccount' object class only
  {ldap_filter, "(objectClass=shadowAccount)"}.
</PRE><P>Now we want to use users LDAP-info as their vCards. We have four attributes
defined in our LDAP schema: <TT>"mail"</TT> &#X2014; email address, <TT>"givenName"</TT>
&#X2014; first name, <TT>"sn"</TT> &#X2014; second name, <TT>"birthDay"</TT> &#X2014; birthday.
Also we want users to search each other. Let's see how we can set it up:</P><PRE CLASS="verbatim">  {modules,
    ...
    {mod_vcard_ldap,
     [
      %% We use the same server and port, but want to bind anonymously because
      %% our LDAP server accepts anonymous requests to
      %% "ou=AddressBook,dc=example,dc=org" subtree.
      {ldap_rootdn, ""},
      {ldap_password, ""},
      %% define the addressbook's base
      {ldap_base, "ou=AddressBook,dc=example,dc=org"},
      %% uidattr: user's part of JID is located in the "mail" attribute
      %% uidattr_format: common format for our emails
      {ldap_uids, [{"mail", "%u@mail.example.org"}]},
      %% We have to define empty filter here, because entries in addressbook does not
      %% belong to shadowAccount object class
      {ldap_filter, ""},
      %% Now we want to define vCard pattern
      {ldap_vcard_map,
       [{"NICKNAME", "%u", []}, % just use user's part of JID as his nickname
        {"GIVEN", "%s", ["givenName"]},
        {"FAMILY", "%s", ["sn"]},
        {"FN", "%s, %s", ["sn", "givenName"]}, % example: "Smith, John"
        {"EMAIL", "%s", ["mail"]},
        {"BDAY", "%s", ["birthDay"]}]},
      %% Search form
      {ldap_search_fields,
       [{"User", "%u"},
        {"Name", "givenName"},
        {"Family Name", "sn"},
        {"Email", "mail"},
        {"Birthday", "birthDay"}]},
      %% vCard fields to be reported
      %% Note that JID is always returned with search results
      {ldap_search_reported,
       [{"Full Name", "FN"},
        {"Nickname", "NICKNAME"},
        {"Birthday", "BDAY"}]}
    ]}
    ...
  }.
</PRE><P>Note that <TT>mod_vcard_ldap</TT> module checks for the existence of the user before
searching in his information in LDAP.</P><!--TOC paragraph Active Directory-->
<H5 CLASS="paragraph"><!--SEC ANCHOR -->Active Directory</H5><!--SEC END --><P>
<A NAME="ad"></A>
</P><P>Active Directory is just an LDAP-server with predefined attributes. A sample
configuration is showed below:</P><PRE CLASS="verbatim">  {auth_method, ldap}.
  {ldap_servers, ["office.org"]}.    % List of LDAP servers
  {ldap_base, "DC=office,DC=org"}. % Search base of LDAP directory
  {ldap_rootdn, "CN=Administrator,CN=Users,DC=office,DC=org"}. % LDAP manager
  {ldap_password, "*******"}. % Password to LDAP manager
  {ldap_uids, [{"sAMAccountName"}]}.
  {ldap_filter, "(memberOf=*)"}.

  {mod_vcard_ldap,
   [{ldap_vcard_map,
     [{"NICKNAME", "%u", []},
      {"GIVEN", "%s", ["givenName"]},
      {"MIDDLE", "%s", ["initials"]},
      {"FAMILY", "%s", ["sn"]},
      {"FN", "%s", ["displayName"]},
      {"EMAIL", "%s", ["mail"]},
      {"ORGNAME", "%s", ["company"]},
      {"ORGUNIT", "%s", ["department"]},
      {"CTRY", "%s", ["c"]},
      {"LOCALITY", "%s", ["l"]},
      {"STREET", "%s", ["streetAddress"]},
      {"REGION", "%s", ["st"]},
      {"PCODE", "%s", ["postalCode"]},
      {"TITLE", "%s", ["title"]},
      {"URL", "%s", ["wWWHomePage"]},
      {"DESC", "%s", ["description"]},
      {"TEL", "%s", ["telephoneNumber"]}]},
    {ldap_search_fields,
     [{"User", "%u"},
      {"Name", "givenName"},
      {"Family Name", "sn"},
      {"Email", "mail"},
      {"Company", "company"},
      {"Department", "department"},
      {"Role", "title"},
      {"Description", "description"},
      {"Phone", "telephoneNumber"}]},
    {ldap_search_reported,
     [{"Full Name", "FN"},
      {"Nickname", "NICKNAME"},
      {"Email", "EMAIL"}]}
   ]
  }.
</PRE><!--TOC section Modules Configuration-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc27">3.3</A>&#XA0;&#XA0;Modules Configuration</H2><!--SEC END --><P>
<A NAME="modules"></A>
</P><P>The option <TT>modules</TT> defines the list of modules that will be loaded after
<TT>ejabberd</TT>'s startup. Each entry in the list is a tuple in which the first
element is the name of a module and the second is a list of options for that
module.</P><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
In this example only the module <TT>mod_echo</TT> is loaded and no module
options are specified between the square brackets:
<PRE CLASS="verbatim">  {modules,
   [{mod_echo,      []}
   ]}.
</PRE></LI><LI CLASS="li-itemize">In the second example the modules <TT>mod_echo</TT>, <TT>mod_time</TT>, and
<TT>mod_version</TT> are loaded without options. Remark that, besides the last entry,
all entries end with a comma:
<PRE CLASS="verbatim">  {modules,
   [{mod_echo,      []},
    {mod_time,      []},
    {mod_version,   []}
   ]}.
</PRE></LI></UL><!--TOC subsection Overview-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc28">3.3.1</A>&#XA0;&#XA0;Overview</H3><!--SEC END --><P>
<A NAME="modoverview"></A>
</P><P>The following table lists all modules available in the official <TT>ejabberd</TT>
distribution. You can find more
<A HREF="http://ejabberd.jabber.ru/contributions">contributed modules</A> on the
<TT>ejabberd</TT> website. Please remember that these contributions might not work or
that they can contain severe bugs and security leaks. Therefore, use them at
your own risk!</P><P>You can see which database backend each module needs by looking at the suffix:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
`_ldap', this means that the module needs an LDAP server as backend.
</LI><LI CLASS="li-itemize">`_odbc', this means that the module needs a supported database
(see&#XA0;<A HREF="#database">3.2</A>) as backend.
</LI><LI CLASS="li-itemize">No suffix, this means that the modules uses Erlang's built-in database
Mnesia as backend.
</LI></UL><P>If you want to
It is possible to use a relational database to store pieces of
information. You can do this by changing the module name to a name with an
<TT>_odbc</TT> suffix in <TT>ejabberd</TT> config file. You can use a relational
database for the following data:</P><UL CLASS="itemize"><LI CLASS="li-itemize">
Last connection date and time: Use <TT>mod_last_odbc</TT> instead of
<TT>mod_last</TT>.
</LI><LI CLASS="li-itemize">Offline messages: Use <TT>mod_offline_odbc</TT> instead of
<TT>mod_offline</TT>.
</LI><LI CLASS="li-itemize">Rosters: Use <TT>mod_roster_odbc</TT> instead of <TT>mod_roster</TT>.
</LI><LI CLASS="li-itemize">Users' VCARD: Use <TT>mod_vcard_odbc</TT> instead of <TT>mod_vcard</TT>.
</LI></UL><BLOCKQUOTE CLASS="table"><DIV CLASS="center"><DIV CLASS="center"><HR WIDTH="80%" SIZE=2></DIV>
<TABLE BORDER=1 CELLSPACING=0 CELLPADDING=1><TR><TD ALIGN=left NOWRAP>Module</TD><TD ALIGN=left NOWRAP>Feature</TD><TD ALIGN=left NOWRAP>Dependencies</TD><TD ALIGN=left NOWRAP>Needed for XMPP?</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_adhoc</TT></TD><TD ALIGN=left NOWRAP>Ad-Hoc Commands (<A HREF="http://www.xmpp.org/extensions/xep-0050.html">XEP-0050</A>)</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_announce</TT></TD><TD ALIGN=left NOWRAP>Manage announcements</TD><TD ALIGN=left NOWRAP><TT>mod_adhoc</TT></TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_configure</TT></TD><TD ALIGN=left NOWRAP>Support for online</TD><TD ALIGN=left NOWRAP><TT>mod_adhoc</TT></TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>configuration of <TT>ejabberd</TT></TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>&nbsp;</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_disco</TT></TD><TD ALIGN=left NOWRAP>Service Discovery (<A HREF="http://www.xmpp.org/extensions/xep-0030.html">XEP-0030</A>)</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_echo</TT></TD><TD ALIGN=left NOWRAP>Echoes Jabber packets</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_irc</TT></TD><TD ALIGN=left NOWRAP>IRC transport</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_last</TT></TD><TD ALIGN=left NOWRAP>Last Activity (<A HREF="http://www.xmpp.org/extensions/xep-0012.html">XEP-0012</A>)</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_last_odbc</TT></TD><TD ALIGN=left NOWRAP>Last Activity (<A HREF="http://www.xmpp.org/extensions/xep-0012.html">XEP-0012</A>)</TD><TD ALIGN=left NOWRAP>supported database (*)</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_muc</TT></TD><TD ALIGN=left NOWRAP>Multi-User Chat (<A HREF="http://www.xmpp.org/extensions/xep-0045.html">XEP-0045</A>)</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_muc_log</TT></TD><TD ALIGN=left NOWRAP>Multi-User Chat room logging</TD><TD ALIGN=left NOWRAP><TT>mod_muc</TT></TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_offline</TT></TD><TD ALIGN=left NOWRAP>Offline message storage</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_offline_odbc</TT></TD><TD ALIGN=left NOWRAP>Offline message storage</TD><TD ALIGN=left NOWRAP>supported database (*)</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_privacy</TT></TD><TD ALIGN=left NOWRAP>Blocking Communication</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>Yes</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_private</TT></TD><TD ALIGN=left NOWRAP>Private XML Storage (<A HREF="http://www.xmpp.org/extensions/xep-0049.html">XEP-0049</A>)</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_private_odbc</TT></TD><TD ALIGN=left NOWRAP>Private XML Storage (<A HREF="http://www.xmpp.org/extensions/xep-0049.html">XEP-0049</A>)</TD><TD ALIGN=left NOWRAP>supported database (*)</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_proxy65</TT></TD><TD ALIGN=left NOWRAP>SOCKS5 Bytestreams (<A HREF="http://www.xmpp.org/extensions/xep-0065.html">XEP-0065</A>)</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_pubsub</TT></TD><TD ALIGN=left NOWRAP>Publish-Subscribe (<A HREF="http://www.xmpp.org/extensions/xep-0060.html">XEP-0060</A>)</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_register</TT></TD><TD ALIGN=left NOWRAP>In-Band Registration (<A HREF="http://www.xmpp.org/extensions/xep-0077.html">XEP-0077</A>)</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_roster</TT></TD><TD ALIGN=left NOWRAP>Roster management</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>Yes (**)</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_roster_odbc</TT></TD><TD ALIGN=left NOWRAP>Roster management</TD><TD ALIGN=left NOWRAP>supported database (*)</TD><TD ALIGN=left NOWRAP>Yes (**)</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_service_log</TT></TD><TD ALIGN=left NOWRAP>Copy user messages to logger service</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_shared_roster</TT></TD><TD ALIGN=left NOWRAP>Shared roster management</TD><TD ALIGN=left NOWRAP><TT>mod_roster</TT> or</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP><TT>mod_roster_odbc</TT></TD><TD ALIGN=left NOWRAP>&nbsp;</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_stats</TT></TD><TD ALIGN=left NOWRAP>Statistics Gathering (<A HREF="http://www.xmpp.org/extensions/xep-0039.html">XEP-0039</A>)</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_time</TT></TD><TD ALIGN=left NOWRAP>Entity Time (<A HREF="http://www.xmpp.org/extensions/xep-0090.html">XEP-0090</A>)</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_vcard</TT></TD><TD ALIGN=left NOWRAP>vcard-temp (<A HREF="http://www.xmpp.org/extensions/xep-0054.html">XEP-0054</A>)</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_vcard_ldap</TT></TD><TD ALIGN=left NOWRAP>vcard-temp (<A HREF="http://www.xmpp.org/extensions/xep-0054.html">XEP-0054</A>)</TD><TD ALIGN=left NOWRAP>LDAP server</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_vcard_odbc</TT></TD><TD ALIGN=left NOWRAP>vcard-temp (<A HREF="http://www.xmpp.org/extensions/xep-0054.html">XEP-0054</A>)</TD><TD ALIGN=left NOWRAP>supported database (*)</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_version</TT></TD><TD ALIGN=left NOWRAP>Software Version (<A HREF="http://www.xmpp.org/extensions/xep-0092.html">XEP-0092</A>)</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>No</TD></TR>
</TABLE>
<DIV CLASS="center"><HR WIDTH="80%" SIZE=2></DIV></DIV></BLOCKQUOTE><UL CLASS="itemize"><LI CLASS="li-itemize">
(*) For a list of supported databases, see section&#XA0;<A HREF="#database">3.2</A>.
</LI><LI CLASS="li-itemize">(**) This module or a similar one with another database backend is needed for
XMPP compliancy.
</LI></UL><!--TOC subsection Common Options-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc29">3.3.2</A>&#XA0;&#XA0;Common Options</H3><!--SEC END --><P>
<A NAME="modcommonoptions"></A></P><P>The following options are used by many modules. Therefore, they are described in
this separate section.</P><!--TOC subsubsection <TT>iqdisc</TT>-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR --><TT>iqdisc</TT></H4><!--SEC END --><P>
<A NAME="modiqdiscoption"></A>
</P><P>Many modules define handlers for processing IQ queries of different namespaces
to this server or to a user (e.&#XA0;g. to <TT>example.org</TT> or to
<TT>user@example.org</TT>). This option defines processing discipline for
these queries. Possible values are:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>no_queue</TT></B></DT><DD CLASS="dd-description"> All queries of a namespace with this processing discipline are
processed immediately. This also means that no other packets can be processed
until this one has been completely processed. Hence this discipline is not
recommended if the processing of a query can take a relatively long time.
</DD><DT CLASS="dt-description"><B><TT>one_queue</TT></B></DT><DD CLASS="dd-description"> In this case a separate queue is created for the processing
of IQ queries of a namespace with this discipline. In addition, the processing
of this queue is done in parallel with that of other packets. This discipline
is most recommended.
</DD><DT CLASS="dt-description"><B><TT>parallel</TT></B></DT><DD CLASS="dd-description"> For every packet with this discipline a separate Erlang process
is spawned. Consequently, all these packets are processed in parallel.
Although spawning of Erlang process has a relatively low cost, this can break
the server's normal work, because the Erlang emulator has a limit on the
number of processes (32000 by default).
</DD></DL><P>Example:
</P><PRE CLASS="verbatim">  {modules,
   [
    ...
    {mod_time, [{iqdisc, no_queue}]},
    ...
   ]}.
</PRE><!--TOC subsubsection <TT>hosts</TT>-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR --><TT>hosts</TT></H4><!--SEC END --><P>
<A NAME="modhostsoption"></A>
</P><P>A module acting as a service can have one or more hostnames. These hostnames
can be defined with the <TT>hosts</TT> option.</P><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
Serving the echo module on one domain:
<UL CLASS="itemize"><LI CLASS="li-itemize">
<PRE CLASS="verbatim">  {modules,
   [
    ...
    {mod_echo, [{hosts, ["echo.example.org"]}]},
    ...
   ]}.
</PRE></LI><LI CLASS="li-itemize">Backwards compatibility with older <TT>ejabberd</TT> versions can be retained
with:
<PRE CLASS="verbatim">  {modules,
   [
    ...
    {mod_echo, [{host, "echo.example.org"}]},
    ...
   ]}.
</PRE></LI></UL>
</LI><LI CLASS="li-itemize">Serving the echo module on two domains:
<PRE CLASS="verbatim">  {modules,
   [
    ...
    {mod_echo, [{hosts, ["echo.example.net", "echo.example.com"]}]},
    ...
   ]}.
</PRE></LI></UL><!--TOC subsection <TT>mod_announce</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc30">3.3.3</A>&#XA0;&#XA0;<TT>mod_announce</TT></H3><!--SEC END --><P>
<A NAME="modannounce"></A>
</P><P>This module enables configured users to broadcast announcements and to set
the message of the day (MOTD). Configured users can do these actions with their
Jabber client by sending messages to specific JIDs. These JIDs are listed in
next paragraph. The first JID in each entry will apply only to the virtual host
<TT>example.org</TT>, while the JID between brackets will apply to all virtual
hosts:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>example.org/announce/all (example.org/announce/all-hosts/all)</TT></B></DT><DD CLASS="dd-description"> The
message is sent to all registered users. If the user is online and connected
to several resources, only the resource with the highest priority will receive
the message. If the registered user is not connected, the message will be
stored offline in assumption that offline storage
(see section&#XA0;<A HREF="#modoffline">3.3.10</A>) is enabled.
</DD><DT CLASS="dt-description"><B><TT>example.org/announce/online (example.org/announce/all-hosts/online)</TT></B></DT><DD CLASS="dd-description">The
message is sent to all connected users. If the user is online and connected
to several resources, all resources will receive the message.
</DD><DT CLASS="dt-description"><B><TT>example.org/announce/motd (example.org/announce/all-hosts/motd)</TT></B></DT><DD CLASS="dd-description">The
message is set as the message of the day (MOTD) and is sent to users when they
login. In addition the message is sent to all connected users (similar to
<TT>announce/online</TT>).
</DD><DT CLASS="dt-description"><B><TT>example.org/announce/motd/update (example.org/announce/all-hosts/motd/update)</TT></B></DT><DD CLASS="dd-description">
The message is set as message of the day (MOTD) and is sent to users when they
login. The message is <EM>not sent</EM> to any currently connected user.
</DD><DT CLASS="dt-description"><B><TT>example.org/announce/motd/delete (example.org/announce/all-hosts/motd/delete)</TT></B></DT><DD CLASS="dd-description">
Any message sent to this JID removes the existing message of the day (MOTD).
</DD></DL><P>Options:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>access</TT></B></DT><DD CLASS="dd-description"> This option specifies who is allowed to
send announcements and to set the message of the day (by default, nobody is
able to send such messages).
</DD></DL><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
Only administrators can send announcements:
<PRE CLASS="verbatim">  {access, announce, [{allow, admins}]}.

  {modules,
   [
    ...
    {mod_announce, [{access, announce}]},
    ...
   ]}.
</PRE></LI><LI CLASS="li-itemize">Administrators as well as the direction can send announcements:
<PRE CLASS="verbatim">  {acl, direction, {user, "big_boss", "example.org"}}.
  {acl, direction, {user, "assistant", "example.org"}}.
  {acl, admins, {user, "admin", "example.org"}}.
  ...
  {access, announce, [{allow, admins},
                      {allow, direction}]}.
  ...
  {modules,
   [
    ...
    {mod_announce, [{access, announce}]},
    ...
   ]}.
</PRE></LI></UL><!--TOC subsection <TT>mod_disco</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc31">3.3.4</A>&#XA0;&#XA0;<TT>mod_disco</TT></H3><!--SEC END --><P>
<A NAME="moddisco"></A>
</P><P>This module adds support for Service Discovery (<A HREF="http://www.xmpp.org/extensions/xep-0030.html">XEP-0030</A>). With
this module enabled, services on your server can be discovered by
Jabber clients. Note that <TT>ejabberd</TT> has no modules with support
for the superseded Jabber Browsing (<A HREF="http://www.xmpp.org/extensions/xep-0011.html">XEP-0011</A>) and Agent Information
(<A HREF="http://www.xmpp.org/extensions/xep-0094.html">XEP-0094</A>). Accordingly, Jabber clients need to have support for
the newer Service Discovery protocol if you want them be able to discover
the services you offer.</P><P>Options:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>iqdisc</TT></B></DT><DD CLASS="dd-description"> This specifies 
the processing discipline for Service Discovery (<TT>http://jabber.org/protocol/disco#items</TT> and
<TT>http://jabber.org/protocol/disco#info</TT>) IQ queries (see section&#XA0;<A HREF="#modiqdiscoption">3.3.2</A>).
</DD><DT CLASS="dt-description"><B><TT>extra_domains</TT></B></DT><DD CLASS="dd-description"> With this option,
extra domains can be added to the Service Discovery item list.
</DD></DL><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
To serve a link to the Jabber User Directory on <TT>jabber.org</TT>:
<PRE CLASS="verbatim">  {modules,
   [
    ...
    {mod_disco, [{extra_domains, ["users.jabber.org"]}]},
    ...
   ]}.
</PRE></LI><LI CLASS="li-itemize">To serve a link to the transports on another server:
<PRE CLASS="verbatim">  {modules,
   [
    ...
    {mod_disco, [{extra_domains, ["icq.example.com",
                                  "msn.example.com"]}]},
    ...
   ]}.
</PRE></LI><LI CLASS="li-itemize">To serve a link to a few friendly servers:
<PRE CLASS="verbatim">  {modules,
   [
    ...
    {mod_disco, [{extra_domains, ["example.org",
                                  "example.com"]}]},
    ...
   ]}.
</PRE></LI></UL><!--TOC subsection <TT>mod_echo</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc32">3.3.5</A>&#XA0;&#XA0;<TT>mod_echo</TT></H3><!--SEC END --><P>
<A NAME="modecho"></A>
</P><P>This module simply echoes any Jabber
packet back to the sender. This mirror can be of interest for
<TT>ejabberd</TT> and Jabber client debugging.</P><P>Options:
</P><DL CLASS="description"><DT CLASS="dt-description">

<B><TT>hosts</TT></B></DT><DD CLASS="dd-description">  This option defines the hostnames of the
service (see section&#XA0;<A HREF="#modhostsoption">3.3.2</A>). If neither <TT>hosts</TT> nor
the old <TT>host</TT> is present, the prefix `<TT>echo.</TT>' is added to all
<TT>ejabberd</TT> hostnames.

</DD></DL><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
Mirror, mirror, on the wall, who is the most beautiful
of them all?
<PRE CLASS="verbatim">  {modules,
   [
    ...
    {mod_echo, [{hosts, ["mirror.example.org"]}]},
    ...
   ]}.
</PRE></LI><LI CLASS="li-itemize">If you still do not understand the inner workings of <TT>mod_echo</TT>,
you can find a few more examples in section&#XA0;<A HREF="#modhostsoption">3.3.2</A>.
</LI></UL><!--TOC subsection <TT>mod_irc</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc33">3.3.6</A>&#XA0;&#XA0;<TT>mod_irc</TT></H3><!--SEC END --><P>
<A NAME="modirc"></A>
</P><P>This module is an IRC transport that can be used to join channels on IRC
servers.</P><P>End user information:

</P><UL CLASS="itemize"><LI CLASS="li-itemize">
A Jabber client with `groupchat 1.0' support or Multi-User
Chat support (<A HREF="http://www.xmpp.org/extensions/xep-0045.html">XEP-0045</A>) is necessary to join IRC channels.
</LI><LI CLASS="li-itemize">An IRC channel can be joined in nearly the same way as joining a
Jabber Multi-User Chat room. The difference is that the room name will
be `channel%<TT>irc.example.org</TT>' in case <TT>irc.example.org</TT> is
the IRC server hosting `channel'. And of course the host should point
to the IRC transport instead of the Multi-User Chat service.
</LI><LI CLASS="li-itemize">You can register your nickame by sending `IDENTIFY password' to<BR>
 <TT>nickserver!irc.example.org@irc.jabberserver.org</TT>.
</LI><LI CLASS="li-itemize">Entering your password is possible by sending `LOGIN nick password'<BR>
 to <TT>nickserver!irc.example.org@irc.jabberserver.org</TT>.
</LI><LI CLASS="li-itemize">When using a popular Jabber server, it can occur that no
connection can be achieved with some IRC servers because they limit the
number of conections from one IP.
</LI></UL><P>Options:
</P><DL CLASS="description"><DT CLASS="dt-description">

<B><TT>hosts</TT></B></DT><DD CLASS="dd-description">  This option defines the hostnames of the
service (see section&#XA0;<A HREF="#modhostsoption">3.3.2</A>). If neither <TT>hosts</TT> nor
the old <TT>host</TT> is present, the prefix `<TT>irc.</TT>' is added to all
<TT>ejabberd</TT> hostnames.

</DD><DT CLASS="dt-description"><B><TT>access</TT></B></DT><DD CLASS="dd-description"> This option can be used to specify who
may use the IRC transport (default value: <TT>all</TT>).
</DD><DT CLASS="dt-description"><B><TT>default_encoding</TT></B></DT><DD CLASS="dd-description"> Set the default IRC encoding (default value: <TT>"koi8-r"</TT>).
</DD></DL><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
In the first example, the IRC transport is available on (all) your
virtual host(s) with the prefix `<TT>irc.</TT>'. Furthermore, anyone is
able to use the transport. The default encoding is set to "iso8859-15".
<PRE CLASS="verbatim">  {modules,
   [
    ...
    {mod_irc, [{access, all}, {default_encoding, "iso8859-15"}]},
    ...
   ]}.
</PRE></LI><LI CLASS="li-itemize">In next example the IRC transport is available on the two virtual hosts
<TT>example.net</TT> and <TT>example.com</TT> with different prefixes on each host.
Moreover, the transport is only accessible by paying customers registered on
our domains and on other servers.
<PRE CLASS="verbatim">  {acl, paying_customers, {user, "customer1", "example.net"}}.
  {acl, paying_customers, {user, "customer2", "example.com"}}.
  {acl, paying_customers, {user, "customer3", "example.org"}}.
  ...
  {access, paying_customers, [{allow, paying_customers},
                              {deny, all}]}.
  ...
  {modules,
   [
    ...
    {mod_irc, [{access, paying_customers},
               {hosts, ["irc.example.net", "irc-transport.example.com"]}]},
    ...
   ]}.
</PRE></LI></UL><!--TOC subsection <TT>mod_last</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc34">3.3.7</A>&#XA0;&#XA0;<TT>mod_last</TT></H3><!--SEC END --><P>
<A NAME="modlast"></A>
</P><P>This module adds support for Last Activity (<A HREF="http://www.xmpp.org/extensions/xep-0012.html">XEP-0012</A>). It can be used to
discover when a disconnected user last accessed the server, to know when a
connected user was last active on the server, or to query the uptime of the
<TT>ejabberd</TT> server.</P><P>Options:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>iqdisc</TT></B></DT><DD CLASS="dd-description"> This specifies 
the processing discipline for Last activity (<TT>jabber:iq:last</TT>) IQ queries (see section&#XA0;<A HREF="#modiqdiscoption">3.3.2</A>).
</DD></DL><!--TOC subsection <TT>mod_muc</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc35">3.3.8</A>&#XA0;&#XA0;<TT>mod_muc</TT></H3><!--SEC END --><P>
<A NAME="modmuc"></A>
</P><P>With this module enabled, your server will support Multi-User Chat
(<A HREF="http://www.xmpp.org/extensions/xep-0045.html">XEP-0045</A>). End users will be able to join text conferences. Notice
that this module is not (yet) clusterable.</P><P>Some of the features of Multi-User Chat:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
Sending private messages to room participants.
</LI><LI CLASS="li-itemize">Inviting users.
</LI><LI CLASS="li-itemize">Setting a conference topic.
</LI><LI CLASS="li-itemize">Creating password protected rooms.
</LI><LI CLASS="li-itemize">Kicking and banning participants.
</LI></UL><P>Options:
</P><DL CLASS="description"><DT CLASS="dt-description">

<B><TT>hosts</TT></B></DT><DD CLASS="dd-description">  This option defines the hostnames of the
service (see section&#XA0;<A HREF="#modhostsoption">3.3.2</A>). If neither <TT>hosts</TT> nor
the old <TT>host</TT> is present, the prefix `<TT>conference.</TT>' is added to all
<TT>ejabberd</TT> hostnames.

</DD><DT CLASS="dt-description"><B><TT>access</TT></B></DT><DD CLASS="dd-description"> You can specify who is allowed to use
the Multi-User Chat service (by default, everyone is allowed to use it).
</DD><DT CLASS="dt-description"><B><TT>access_create</TT></B></DT><DD CLASS="dd-description"> To configure who is
allowed to create new rooms at the Multi-User Chat service, this option
can be used (by default, everybody is allowed to create rooms).
</DD><DT CLASS="dt-description"><B><TT>access_persistent</TT></B></DT><DD CLASS="dd-description"> To configure who is
allowed to modify the 'persistent' chatroom option
(by default, everybody is allowed to modify that option).
</DD><DT CLASS="dt-description"><B><TT>access_admin</TT></B></DT><DD CLASS="dd-description"> This option specifies
who is allowed to administrate the Multi-User Chat service (the default
value is <TT>none</TT>, which means that only the room creator can
administer his room). By sending a message to the service JID,
administrators can send service messages that will be displayed in every
active room.
</DD><DT CLASS="dt-description"><B><TT>history_size</TT></B></DT><DD CLASS="dd-description"> A small history of the
current discussion is sent to users when they enter the room. With this option
you can define the number of history messages to keep and send to users
joining the room. The value is an integer. Setting the value to <TT>0</TT>
disables the history feature and, as a result, nothing is kept in memory. The
default value is <TT>20</TT>. This value is global and thus affects all rooms on
the server.
</DD><DT CLASS="dt-description"><B><TT>min_message_interval</TT></B></DT><DD CLASS="dd-description"> 
This option defines the minimum interval between two messages send by
a user in seconds. This option is global and valid for all chat
rooms. A decimal value can be used. When this option is not defined,
message rate is not limited. This feature can be used to protect a MUC
service from users abuses and limit number of messages that will be
broadcasted by the service. A good value for this minimum message
interval is 0.4 second. If a user tries to send messages faster, an
error is send back explaining that the message have been discarded and
describing the reason why the message is not acceptable.
</DD><DT CLASS="dt-description"><B><TT>min_presence_interval</TT></B></DT><DD CLASS="dd-description"> 
This option defines the minimum of time between presence changes
coming from a given user in seconds. This option is global and valid
for all chat rooms. A decimal value can be used. When this option is
not defined, no restriction is applied. This option can be used to
protect a MUC service for users abuses, as fastly changing a user
presence will result in possible large presence packet broadcast. If a
user tries to change its presence more often than the specified
interval, the presence is cached by ejabberd and only the last
presence is broadcasted to all users in the room after expiration of
the interval delay. Intermediate presence packets are silently
discarded. A good value for this option is 4 seconds.
</DD></DL><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
In the first example everyone is allowed to use the Multi-User Chat
service. Everyone will also be able to create new rooms but only the user
<TT>admin@example.org</TT> is allowed to administrate any room. In this
example he is also a global administrator. When <TT>admin@example.org</TT>
sends a message such as `Tomorrow, the Jabber server will be moved
to new hardware. This will involve service breakdowns around 23:00 UMT.
We apologise for this inconvenience.' to <TT>conference.example.org</TT>,
it will be displayed in all active rooms. In this example the history
feature is disabled.
<PRE CLASS="verbatim">  {acl, admins, {user, "admin", "example.org"}}.
  ...
  {access, muc_admins, [{allow, admins}]}.
  ...
  {modules,
   [
    ...
    {mod_muc, [{access, all},
               {access_create, all},
               {access_admin, muc_admins},
               {history_size, 0}]},
    ...
   ]}.
</PRE></LI><LI CLASS="li-itemize">In the second example the Multi-User Chat service is only accessible by
paying customers registered on our domains and on other servers. Of course
the administrator is also allowed to access rooms. In addition, he is the
only authority able to create and administer rooms. When
<TT>admin@example.org</TT> sends a message such as `Tomorrow, the Jabber
server will be moved to new hardware. This will involve service breakdowns
around 23:00 UMT. We apologise for this inconvenience.' to
<TT>conference.example.org</TT>, it will be displayed in all active rooms. No
<TT>history_size</TT> option is used, this means that the feature is enabled
and the default value of 20 history messages will be send to the users.
<PRE CLASS="verbatim">  {acl, paying_customers, {user, "customer1", "example.net"}}.
  {acl, paying_customers, {user, "customer2", "example.com"}}.
  {acl, paying_customers, {user, "customer3", "example.org"}}.
  {acl, admins, {user, "admin", "example.org"}}.
  ...
  {access, muc_admins, [{allow, admins},
                        {deny, all}]}.
  {access, muc_access, [{allow, paying_customers},
                        {allow, admins},
                        {deny, all}]}.
  ...
  {modules,
   [
    ...
    {mod_muc, [{access, muc_access},
               {access_create, muc_admins},
               {access_admin, muc_admins}]},
    ...
   ]}.
</PRE></LI><LI CLASS="li-itemize">In the following example, MUC anti abuse options are used. A
user cannot send more than one message every 0.4 seconds and cannot
change its presence more than once every 4 seconds. No ACLs are
defined, but some user restriction could be added as well:<PRE CLASS="verbatim">  ...
  {modules,
   [
    ...
    {mod_muc, [{min_message_interval, 0.4},
               {min_presence_interval, 4}]},
    ...
   ]}.
</PRE></LI></UL><P>The Multi-Users Chat module now supports clustering and load
balancing. One module can be started per cluster node. Rooms are
distributed at creation time on all available MUC module
instances. The multi-user chat module is clustered but the room
themselves are not clustered nor fault-tolerant: If the node managing a
set of rooms goes down, the rooms disappear and they will be recreated
on an available node on first connection attempt.</P><!--TOC subsection <TT>mod_muc_log</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc36">3.3.9</A>&#XA0;&#XA0;<TT>mod_muc_log</TT></H3><!--SEC END --><P>
<A NAME="modmuclog"></A>
</P><P>This module enables optional logging of Multi-User Chat (MUC) conversations to
HTML. Once you enable this module, users can join a chatroom using a MUC capable
Jabber client, and if they have enough privileges, they can request the
configuration form in which they can set the option to enable chatroom logging.</P><P>Features:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
Chatroom details are added on top of each page: room title, JID,
author, subject and configuration.
</LI><LI CLASS="li-itemize">
Room title and JID are links to join the chatroom (using
<A HREF="http://www.ietf.org/rfc/rfc4622.txt">XMPP URIs</A>).
</LI><LI CLASS="li-itemize">Subject and chatroom configuration changes are tracked and displayed.
</LI><LI CLASS="li-itemize">Joins, leaves, nick changes, kicks, bans and `/me' are tracked and
displayed, including the reason if available.
</LI><LI CLASS="li-itemize">Generated HTML files are XHTML 1.0 Transitional and CSS compliant.
</LI><LI CLASS="li-itemize">Timestamps are self-referencing links.
</LI><LI CLASS="li-itemize">Links on top for quicker navigation: Previous day, Next day, Up.
</LI><LI CLASS="li-itemize">CSS is used for style definition, and a custom CSS file can be used.
</LI><LI CLASS="li-itemize">URLs on messages and subjects are converted to hyperlinks.
</LI><LI CLASS="li-itemize">Timezone used on timestamps is shown on the log files.
</LI><LI CLASS="li-itemize">A custom link can be added on top of each page.
</LI></UL><P>Options:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>access_log</TT></B></DT><DD CLASS="dd-description">
This option restricts which users are allowed to enable or disable chatroom
logging. The default value is <TT>muc_admin</TT>. Note for this default setting
you need to have an access rule for <TT>muc_admin</TT> in order to take effect.
</DD><DT CLASS="dt-description"><B><TT>cssfile</TT></B></DT><DD CLASS="dd-description">
With this option you can set whether the HTML files should have a custom CSS
file or if they need to use the embedded CSS file. Allowed values are
<TT>false</TT> and an URL to a CSS file. With the first value, HTML files will
include the embedded CSS code. With the latter, you can specify the URL of the
custom CSS file (for example: `http://example.com/my.css'). The default value
is <TT>false</TT>.
</DD><DT CLASS="dt-description"><B><TT>dirtype</TT></B></DT><DD CLASS="dd-description">
The type of the created directories can be specified with this option. Allowed
values are <TT>subdirs</TT> and <TT>plain</TT>. With the first value,
subdirectories are created for each year and month. With the latter, the
names of the log files contain the full date, and there are no subdirectories.
The default value is <TT>subdirs</TT>.
</DD><DT CLASS="dt-description"><B><TT>outdir</TT></B></DT><DD CLASS="dd-description">
This option sets the full path to the directory in which the HTML files should
be stored. Make sure the <TT>ejabberd</TT> daemon user has write access on that
directory. The default value is <TT>"www/muc"</TT>.
</DD><DT CLASS="dt-description"><B><TT>timezone</TT></B></DT><DD CLASS="dd-description">
The time zone for the logs is configurable with this option. Allowed values
are <TT>local</TT> and <TT>universal</TT>. With the first value, the local time,
as reported to Erlang by the operating system, will be used. With the latter,
GMT/UTC time will be used. The default value is <TT>local</TT>.
</DD><DT CLASS="dt-description"><B><TT>spam_prevention</TT></B></DT><DD CLASS="dd-description">
To prevent spam, the <TT>spam_prevention</TT> option adds a special attribute
to links that prevent their indexation by search engines. The default value
is <TT>true</TT>, which mean that nofollow attributes will be added to user
submitted links. 
</DD><DT CLASS="dt-description"><B><TT>top_link</TT></B></DT><DD CLASS="dd-description">
With this option you can customize the link on the top right corner of each
log file. The syntax of this option is <TT>{"URL", "Text"}</TT>. The default
value is <TT>{"/", "Home"}</TT>.
</DD></DL><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
In the first example any chatroom owner can enable logging, and a
custom CSS file will be used (http://example.com/my.css). Further, the names
of the log files will contain the full date, and there will be no
subdirectories. The log files will be stored in /var/www/muclogs, and the
time zone will be GMT/UTC. Finally, the top link will be
<CODE>&lt;a href="http://www.jabber.ru"&gt;Jabber.ru&lt;/a&gt;</CODE>.
<PRE CLASS="verbatim">  {access, muc, [{allow, all}]}.
  ...
  {modules,
   [
    ...
    {mod_muc_log, [
               {access_log, muc},
               {cssfile, "http://example.com/my.css"},
               {dirtype, plain},
               {outdir, "/var/www/muclogs"},
               {timezone, universal},
               {spam_prevention, true},
               {top_link, {"http://www.jabber.ru", "Jabber.ru"}}
    ]},
    ...
   ]}.
</PRE></LI><LI CLASS="li-itemize">In the second example only <TT>admin1@example.org</TT> and
<TT>admin2@example.net</TT> can enable logging, and the embedded CSS file will be
used. Further, the names of the log files will only contain the day (number),
and there will be subdirectories for each year and month. The log files will
be stored in /var/www/muclogs, and the local time will be used. Finally, the
top link will be the default <CODE>&lt;a href="/"&gt;Home&lt;/a&gt;</CODE>.
<PRE CLASS="verbatim">  {acl, admins, {user, "admin1", "example.org"}}.
  {acl, admins, {user, "admin2", "example.net"}}.
  ...
  {access, muc_log, [{allow, admins},
                     {deny, all}]}.
  ...
  {modules,
   [
    ...
    {mod_muc_log, [
               {access_log, muc_log},
               {cssfile, false},
               {dirtype, subdirs},
               {outdir, "/var/www/muclogs"},
               {timezone, local}
    ]},
    ...
   ]}.
</PRE></LI></UL><!--TOC subsection <TT>mod_offline</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc37">3.3.10</A>&#XA0;&#XA0;<TT>mod_offline</TT></H3><!--SEC END --><P>
<A NAME="modoffline"></A>
</P><P>This module implements offline message storage. This means that all messages
sent to an offline user will be stored on the server until that user comes
online again. Thus it is very similar to how email works. Note that
<TT>ejabberdctl</TT> has a command to delete expired messages
(see section&#XA0;<A HREF="#ejabberdctl">4.1.2</A>).</P><!--TOC subsection <TT>mod_privacy</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc38">3.3.11</A>&#XA0;&#XA0;<TT>mod_privacy</TT></H3><!--SEC END --><P>
<A NAME="modprivacy"></A>
</P><P>This module implements Blocking Communication (also known as Privacy Rules)
as defined in section 10 from XMPP IM. If end users have support for it in
their Jabber client, they will be able to:
</P><BLOCKQUOTE CLASS="quote">
<UL CLASS="itemize"><LI CLASS="li-itemize">
Retrieving one's privacy lists.
</LI><LI CLASS="li-itemize">Adding, removing, and editing one's privacy lists.
</LI><LI CLASS="li-itemize">Setting, changing, or declining active lists.
</LI><LI CLASS="li-itemize">Setting, changing, or declining the default list (i.e., the list that
is active by default).
</LI><LI CLASS="li-itemize">Allowing or blocking messages based on JID, group, or subscription type
(or globally).
</LI><LI CLASS="li-itemize">Allowing or blocking inbound presence notifications based on JID, group,
or subscription type (or globally).
</LI><LI CLASS="li-itemize">Allowing or blocking outbound presence notifications based on JID, group,
or subscription type (or globally).
</LI><LI CLASS="li-itemize">Allowing or blocking IQ stanzas based on JID, group, or subscription type
(or globally).
</LI><LI CLASS="li-itemize">Allowing or blocking all communications based on JID, group, or
subscription type (or globally).
</LI></UL>
(from <A HREF="http://www.xmpp.org/specs/rfc3921.html#privacy"><TT>http://www.xmpp.org/specs/rfc3921.html#privacy</TT></A>)
</BLOCKQUOTE><P>Options:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>iqdisc</TT></B></DT><DD CLASS="dd-description"> This specifies 
the processing discipline for Blocking Communication (<TT>jabber:iq:privacy</TT>) IQ queries (see section&#XA0;<A HREF="#modiqdiscoption">3.3.2</A>).
</DD></DL><!--TOC subsection <TT>mod_private</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc39">3.3.12</A>&#XA0;&#XA0;<TT>mod_private</TT></H3><!--SEC END --><P>
<A NAME="modprivate"></A>
</P><P>This module adds support for Private XML Storage (<A HREF="http://www.xmpp.org/extensions/xep-0049.html">XEP-0049</A>):
</P><BLOCKQUOTE CLASS="quote">
Using this method, Jabber entities can store private data on the server and
retrieve it whenever necessary. The data stored might be anything, as long as
it is valid XML. One typical usage for this namespace is the server-side storage
of client-specific preferences; another is Bookmark Storage (<A HREF="http://www.xmpp.org/extensions/xep-0048.html">XEP-0048</A>).
</BLOCKQUOTE><P>Options:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>iqdisc</TT></B></DT><DD CLASS="dd-description"> This specifies 
the processing discipline for Private XML Storage (<TT>jabber:iq:private</TT>) IQ queries (see section&#XA0;<A HREF="#modiqdiscoption">3.3.2</A>).
</DD></DL><!--TOC subsection <TT>mod_proxy65</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc40">3.3.13</A>&#XA0;&#XA0;<TT>mod_proxy65</TT></H3><!--SEC END --><P>
<A NAME="modproxy"></A>
</P><P>This module implements SOCKS5 Bytestreams (<A HREF="http://www.xmpp.org/extensions/xep-0065.html">XEP-0065</A>).
It allows <TT>ejabberd</TT> to act as a file transfer proxy between two
XMPP clients.</P><P>Options:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>host</TT></B></DT><DD CLASS="dd-description">This option defines the hostname of the service.
If this option is not set, the prefix `<TT>proxy.</TT>' is added to <TT>ejabberd</TT>
hostname.
</DD><DT CLASS="dt-description"><B><TT>name</TT></B></DT><DD CLASS="dd-description">Defines Service Discovery name of the service.
Default is <TT>"SOCKS5 Bytestreams"</TT>.
</DD><DT CLASS="dt-description"><B><TT>ip</TT></B></DT><DD CLASS="dd-description">This option specifies which network interface
to listen for. Default is an IP address of the service's DNS name, or,
if fails, <CODE>{127,0,0,1}</CODE>.
</DD><DT CLASS="dt-description"><B><TT>port</TT></B></DT><DD CLASS="dd-description">This option defines port to listen for
incoming connections. Default is&#XA0;7777.
</DD><DT CLASS="dt-description"><B><TT>auth_type</TT></B></DT><DD CLASS="dd-description">SOCKS5 authentication type.
Possible values are <TT>anonymous</TT> and <TT>plain</TT>. Default is
<TT>anonymous</TT>.
</DD><DT CLASS="dt-description"><B><TT>access</TT></B></DT><DD CLASS="dd-description">Defines ACL for file transfer initiators.
Default is <TT>all</TT>.
</DD><DT CLASS="dt-description"><B><TT>max_connections</TT></B></DT><DD CLASS="dd-description">Maximum number of
active connections per file transfer initiator. No limit by default.
</DD><DT CLASS="dt-description"><B><TT>shaper</TT></B></DT><DD CLASS="dd-description">This option defines shaper for
the file transfer peers. Shaper with the maximum bandwidth will be selected.
Default is <TT>none</TT>.
</DD></DL><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
The simpliest configuration of the module:
<PRE CLASS="verbatim">  {modules,
   [
    ...
    {mod_proxy65, []},
    ...
  ]}.
</PRE></LI><LI CLASS="li-itemize">More complicated configuration.
<PRE CLASS="verbatim">  {acl, proxy_users, {server, "example.org"}}.
  {access, proxy65_access, [{allow, proxy_users}, {deny, all}]}.
  ...
  {acl, admin, {user, "admin", "example.org"}}.
  {shaper, normal, {maxrate, 10240}}. %% 10 Kbytes/sec
  {access, proxy65_shaper, [{none, admin}, {normal, all}]}.
  ...
  {modules,
   [
    ...
    {mod_proxy65, [{host, "proxy1.example.org"},
                   {name, "File Transfer Proxy"},
                   {ip, {200,150,100,1}},
                   {port, 7778},
                   {max_connections, 5},
                   {access, proxy65_access},
                   {shaper, proxy65_shaper}]},
    ...
  ]}.
</PRE></LI></UL><!--TOC subsection <TT>mod_pubsub</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc41">3.3.14</A>&#XA0;&#XA0;<TT>mod_pubsub</TT></H3><!--SEC END --><P>
<A NAME="modpubsub"></A>
</P><P>This module offers a Publish-Subscribe Service (<A HREF="http://www.xmpp.org/extensions/xep-0060.html">XEP-0060</A>).
Publish-Subscribe can be used to develop (examples are taken from the XEP):
</P><BLOCKQUOTE CLASS="quote">
<UL CLASS="itemize"><LI CLASS="li-itemize">
news feeds and content syndacation,
</LI><LI CLASS="li-itemize">avatar management,
</LI><LI CLASS="li-itemize">shared bookmarks,
</LI><LI CLASS="li-itemize">auction and trading systems,
</LI><LI CLASS="li-itemize">online catalogs,
</LI><LI CLASS="li-itemize">workflow systems,
</LI><LI CLASS="li-itemize">network management systems,
</LI><LI CLASS="li-itemize">NNTP gateways,
</LI><LI CLASS="li-itemize">vCard/profile management,
</LI><LI CLASS="li-itemize">and weblogs.
</LI></UL>
</BLOCKQUOTE><P>
Another example is <A HREF="http://www.process-one.net/en/projects/j-eai/">J-EAI</A>.
This is an XMPP-based Enterprise Application Integration (EAI) platform (also
known as ESB, the Enterprise Service Bus). The J-EAI project builts upon
<TT>ejabberd</TT>'s codebase and has contributed several features to <TT>mod_pubsub</TT>.</P><P>Options:
</P><DL CLASS="description"><DT CLASS="dt-description">

<B><TT>hosts</TT></B></DT><DD CLASS="dd-description">  This option defines the hostnames of the
service (see section&#XA0;<A HREF="#modhostsoption">3.3.2</A>). If neither <TT>hosts</TT> nor
the old <TT>host</TT> is present, the prefix `<TT>pubsub.</TT>' is added to all
<TT>ejabberd</TT> hostnames.

</DD><DT CLASS="dt-description"><B><TT>served_hosts</TT></B></DT><DD CLASS="dd-description"> To specify which hosts needs to
be served, you can use this option. If absent, only the main <TT>ejabberd</TT>
host is served. </DD><DT CLASS="dt-description"><B><TT>access_createnode</TT></B></DT><DD CLASS="dd-description"> 
This option restricts which users are allowed to create pubsub nodes using
ACL and ACCESS. The default value is <TT>pubsub_createnode</TT>. </DD></DL><P>Example:
</P><PRE CLASS="verbatim">  {modules,
   [
    ...
    {mod_pubsub, [{served_hosts, ["example.com",
                                  "example.org"]},
                  {access_createnode, pubsub_createnode}]}
    ...
   ]}.
</PRE><!--TOC subsection <TT>mod_register</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc42">3.3.15</A>&#XA0;&#XA0;<TT>mod_register</TT></H3><!--SEC END --><P>
<A NAME="modregister"></A>
</P><P>This module adds support for In-Band Registration (<A HREF="http://www.xmpp.org/extensions/xep-0077.html">XEP-0077</A>). This protocol
enables end users to use a Jabber client to:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
Register a new account on the server.
</LI><LI CLASS="li-itemize">Change the password from an existing account on the server.
</LI><LI CLASS="li-itemize">Delete an existing account on the server.
</LI></UL><P>Options:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>access</TT></B></DT><DD CLASS="dd-description"> This option can be configured to specify
rules to restrict registration. If a rule returns `deny' on the requested
user name, registration for that user name is dennied. (there are no
restrictions by default).
</DD><DT CLASS="dt-description"><B><TT>iqdisc</TT></B></DT><DD CLASS="dd-description"> This specifies 
the processing discipline for In-Band Registration (<TT>jabber:iq:register</TT>) IQ queries (see section&#XA0;<A HREF="#modiqdiscoption">3.3.2</A>).
</DD></DL><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
Next example prohibits the registration of too short account names:
<PRE CLASS="verbatim">  {acl, shortname, {user_glob, "?"}}.
  {acl, shortname, {user_glob, "??"}}.
  % The same using regexp:
  %{acl, shortname, {user_regexp, "^..?$"}}.
  ...
  {access, register, [{deny, shortname},
                      {allow, all}]}.
  ...
  {modules,
   [
    ...
    {mod_register, [{access, register}]},
    ...
   ]}.
</PRE></LI><LI CLASS="li-itemize">The in-band registration of new accounts can be prohibited by changing the
<TT>access</TT> option. If you really want to disable all In-Band Registration
functionality, that is changing passwords in-band and deleting accounts
in-band, you have to remove <TT>mod_register</TT> from the modules list. In this
example all In-Band Registration functionality is disabled:
<PRE CLASS="verbatim">  {access, register, [{deny, all}]}.

  {modules,
   [
    ...
%    {mod_register, [{access, register}]},
    ...
   ]}.
</PRE></LI></UL><!--TOC subsection <TT>mod_roster</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc43">3.3.16</A>&#XA0;&#XA0;<TT>mod_roster</TT></H3><!--SEC END --><P>
<A NAME="modroster"></A>
</P><P>This module implements roster management as defined in <A HREF="http://www.xmpp.org/specs/rfc3921.html#roster">RFC 3921: XMPP IM</A>.</P><P>Options:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>iqdisc</TT></B></DT><DD CLASS="dd-description"> This specifies 
the processing discipline for Roster Management (<TT>jabber:iq:roster</TT>) IQ queries (see section&#XA0;<A HREF="#modiqdiscoption">3.3.2</A>).
</DD></DL><!--TOC subsection <TT>mod_service_log</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc44">3.3.17</A>&#XA0;&#XA0;<TT>mod_service_log</TT></H3><!--SEC END --><P>
<A NAME="modservicelog"></A>
</P><P>This module adds support for logging end user packets via a Jabber message
auditing service such as
<A HREF="http://www.funkypenguin.co.za/bandersnatch/">Bandersnatch</A>. All user
packets are encapsulated in a <CODE>&lt;route/&gt;</CODE> element and sent to the specified
service(s).</P><P>Options:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>loggers</TT></B></DT><DD CLASS="dd-description"> With this option a (list of) service(s)
that will receive the packets can be specified.
</DD></DL><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
To log all end user packets to the Bandersnatch service running on
<TT>bandersnatch.example.com</TT>:
<PRE CLASS="verbatim">  {modules,
   [
    ...
    {mod_service_log, [{loggers, ["bandersnatch.example.com"]}]},
    ...
   ]}.
</PRE></LI><LI CLASS="li-itemize">To log all end user packets to the Bandersnatch service running on
<TT>bandersnatch.example.com</TT> and the backup service on 
<TT>bandersnatch.example.org</TT>:
<PRE CLASS="verbatim">  {modules,
   [
    ...
    {mod_service_log, [{loggers, ["bandersnatch.example.com",
                                  "bandersnatch.example.org"]}]},
    ...
   ]}.
</PRE></LI></UL><!--TOC subsection <TT>mod_shared_roster</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc45">3.3.18</A>&#XA0;&#XA0;<TT>mod_shared_roster</TT></H3><!--SEC END --><P>
<A NAME="modsharedroster"></A>
</P><P>This module enables you to create shared roster groups. This means that you can
create groups of people that can see members from (other) groups in their
rosters. The big advantages of this feature are that end users do not need to
manually add all users to their rosters, and that they cannot permanently delete
users from the shared roster groups.</P><P>Shared roster groups can be edited <EM>only</EM> via the web interface. Each group
has a unique identification and the following parameters:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B>Name</B></DT><DD CLASS="dd-description"> The name of the group, which will be displayed in the roster.
</DD><DT CLASS="dt-description"><B>Description</B></DT><DD CLASS="dd-description"> The description of the group. This parameter does not affect
anything.
</DD><DT CLASS="dt-description"><B>Members</B></DT><DD CLASS="dd-description"> A list of full JIDs of group members, entered one per line in
the web interface.
</DD><DT CLASS="dt-description"><B>Displayed groups</B></DT><DD CLASS="dd-description"> A list of groups that will be in the rosters of this
group's members.
</DD></DL><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
Take the case of a computer club that wants all its members seeing each
other in their rosters. To achieve this, they need to create a shared roster
group similar to next table:
<BLOCKQUOTE CLASS="table"><DIV CLASS="center"><DIV CLASS="center"><HR WIDTH="80%" SIZE=2></DIV>
<TABLE BORDER=1 CELLSPACING=0 CELLPADDING=1><TR><TD ALIGN=left NOWRAP>Identification</TD><TD ALIGN=left NOWRAP>Group `<TT>club_members</TT>'</TD></TR>
<TR><TD ALIGN=left NOWRAP>Name</TD><TD ALIGN=left NOWRAP>Club Members</TD></TR>
<TR><TD ALIGN=left NOWRAP>Description</TD><TD ALIGN=left NOWRAP>Members from the computer club</TD></TR>
<TR><TD ALIGN=left NOWRAP>Members</TD><TD ALIGN=left NOWRAP> <TABLE CELLSPACING=6 CELLPADDING=0><TR><TD ALIGN=left NOWRAP> <TT>member1@example.org</TT></TD></TR>
<TR><TD ALIGN=left NOWRAP> <TT>member2@example.org</TT></TD></TR>
<TR><TD ALIGN=left NOWRAP> <TT>member3@example.org</TT></TD></TR>
</TABLE></TD></TR>
<TR><TD ALIGN=left NOWRAP>Displayed groups</TD><TD ALIGN=left NOWRAP><TT>club_members</TT></TD></TR>
</TABLE>
<DIV CLASS="center"><HR WIDTH="80%" SIZE=2></DIV></DIV></BLOCKQUOTE>
</LI><LI CLASS="li-itemize">In another case we have a company which has three divisions: Management,
Marketing and Sales. All group members should see all other members in their
rosters. Additonally, all managers should have all marketing and sales people
in their roster. Simultaneously, all marketeers and the whole sales team
should see all managers. This scenario can be achieved by creating shared
roster groups as shown in the following table:
<BLOCKQUOTE CLASS="table"><DIV CLASS="center"><DIV CLASS="center"><HR WIDTH="80%" SIZE=2></DIV>
<TABLE BORDER=1 CELLSPACING=0 CELLPADDING=1><TR><TD ALIGN=left NOWRAP>Identification</TD><TD ALIGN=left NOWRAP> Group `<TT>management</TT>'</TD><TD ALIGN=left NOWRAP> Group `<TT>marketing</TT>'</TD><TD ALIGN=left NOWRAP> Group `<TT>sales</TT>'</TD></TR>
<TR><TD ALIGN=left NOWRAP>Name</TD><TD ALIGN=left NOWRAP>Management</TD><TD ALIGN=left NOWRAP>Marketing</TD><TD ALIGN=left NOWRAP>Sales</TD></TR>
<TR><TD ALIGN=left NOWRAP>Description</TD><TD ALIGN=left NOWRAP>&nbsp;</TD></TR>
<TR><TD ALIGN=left NOWRAP> Members</TD><TD ALIGN=left NOWRAP> <TABLE CELLSPACING=6 CELLPADDING=0><TR><TD ALIGN=left NOWRAP> <TT>manager1@example.org</TT></TD></TR>
<TR><TD ALIGN=left NOWRAP> <TT>manager2@example.org</TT></TD></TR>
<TR><TD ALIGN=left NOWRAP> <TT>manager3@example.org</TT></TD></TR>
<TR><TD ALIGN=left NOWRAP> <TT>manager4@example.org</TT></TD></TR>
</TABLE>
</TD><TD ALIGN=left NOWRAP> <TABLE CELLSPACING=6 CELLPADDING=0><TR><TD ALIGN=left NOWRAP> <TT>marketeer1@example.org</TT></TD></TR>
<TR><TD ALIGN=left NOWRAP> <TT>marketeer2@example.org</TT></TD></TR>
<TR><TD ALIGN=left NOWRAP> <TT>marketeer3@example.org</TT></TD></TR>
<TR><TD ALIGN=left NOWRAP> <TT>marketeer4@example.org</TT></TD></TR>
</TABLE>
</TD><TD ALIGN=left NOWRAP> <TABLE CELLSPACING=6 CELLPADDING=0><TR><TD ALIGN=left NOWRAP> <TT>saleswoman1@example.org</TT></TD></TR>
<TR><TD ALIGN=left NOWRAP> <TT>salesman1@example.org</TT></TD></TR>
<TR><TD ALIGN=left NOWRAP> <TT>saleswoman2@example.org</TT></TD></TR>
<TR><TD ALIGN=left NOWRAP> <TT>salesman2@example.org</TT></TD></TR>
</TABLE></TD></TR>
<TR><TD ALIGN=left NOWRAP>Displayed groups</TD><TD ALIGN=left NOWRAP> <TABLE CELLSPACING=6 CELLPADDING=0><TR><TD ALIGN=left NOWRAP> <TT>management</TT></TD></TR>
<TR><TD ALIGN=left NOWRAP> <TT>marketing</TT></TD></TR>
<TR><TD ALIGN=left NOWRAP> <TT>sales</TT></TD></TR>
</TABLE>
</TD><TD ALIGN=left NOWRAP> <TABLE CELLSPACING=6 CELLPADDING=0><TR><TD ALIGN=left NOWRAP> <TT>management</TT></TD></TR>
<TR><TD ALIGN=left NOWRAP> <TT>marketing</TT></TD></TR>
</TABLE>
</TD><TD ALIGN=left NOWRAP> <TABLE CELLSPACING=6 CELLPADDING=0><TR><TD ALIGN=left NOWRAP> <TT>management</TT></TD></TR>
<TR><TD ALIGN=left NOWRAP> <TT>sales</TT></TD></TR>
</TABLE></TD></TR>
</TABLE>
<DIV CLASS="center"><HR WIDTH="80%" SIZE=2></DIV></DIV></BLOCKQUOTE>
</LI></UL><!--TOC subsection <TT>mod_stats</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc46">3.3.19</A>&#XA0;&#XA0;<TT>mod_stats</TT></H3><!--SEC END --><P>
<A NAME="modstats"></A>
</P><P>This module adds support for Statistics Gathering (<A HREF="http://www.xmpp.org/extensions/xep-0039.html">XEP-0039</A>). This protocol
allows you to retrieve next statistics from your <TT>ejabberd</TT> deployment:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
Total number of registered users on the current virtual host (users/total).
</LI><LI CLASS="li-itemize">Total number of registered users on all virtual hosts (users/all-hosts/total).
</LI><LI CLASS="li-itemize">Total number of online users on the current virtual host (users/online).
</LI><LI CLASS="li-itemize">Total number of online users on all virtual hosts (users/all-hosts/online).
</LI></UL><P>Options:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>iqdisc</TT></B></DT><DD CLASS="dd-description"> This specifies 
the processing discipline for Statistics Gathering (<TT>http://jabber.org/protocol/stats</TT>) IQ queries (see section&#XA0;<A HREF="#modiqdiscoption">3.3.2</A>).
</DD></DL><P>As there are only a small amount of clients (for example
<A HREF="http://tkabber.jabber.ru/">Tkabber</A>) and software libraries with
support for this XEP, a few examples are given of the XML you need to send
in order to get the statistics. Here they are:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
You can request the number of online users on the current virtual host
(<TT>example.org</TT>) by sending:
<PRE CLASS="verbatim">&lt;iq to='example.org' type='get'&gt;
  &lt;query xmlns='http://jabber.org/protocol/stats'&gt;
    &lt;stat name='users/online'/&gt;
  &lt;/query&gt;
&lt;/iq&gt;
</PRE></LI><LI CLASS="li-itemize">You can request the total number of registered users on all virtual hosts
by sending:
<PRE CLASS="verbatim">&lt;iq to='example.org' type='get'&gt;
  &lt;query xmlns='http://jabber.org/protocol/stats'&gt;
    &lt;stat name='users/all-hosts/total'/&gt;
  &lt;/query&gt;
&lt;/iq&gt;
</PRE></LI></UL><!--TOC subsection <TT>mod_time</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc47">3.3.20</A>&#XA0;&#XA0;<TT>mod_time</TT></H3><!--SEC END --><P>
<A NAME="modtime"></A>
</P><P>This module features support for Entity Time (<A HREF="http://www.xmpp.org/extensions/xep-0090.html">XEP-0090</A>). By using this XEP,
you are able to discover the time at another entity's location.</P><P>Options:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>iqdisc</TT></B></DT><DD CLASS="dd-description"> This specifies 
the processing discipline for Entity Time (<TT>jabber:iq:time</TT>) IQ queries (see section&#XA0;<A HREF="#modiqdiscoption">3.3.2</A>).
</DD></DL><!--TOC subsection <TT>mod_vcard</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc48">3.3.21</A>&#XA0;&#XA0;<TT>mod_vcard</TT></H3><!--SEC END --><P>
<A NAME="modvcard"></A>
</P><P>This module allows end users to store and retrieve their vCard, and to retrieve
other users vCards, as defined in vcard-temp (<A HREF="http://www.xmpp.org/extensions/xep-0054.html">XEP-0054</A>). The module also
implements an uncomplicated Jabber User Directory based on the vCards of
these users. Moreover, it enables the server to send its vCard when queried.</P><P>Options:
</P><DL CLASS="description"><DT CLASS="dt-description">

<B><TT>hosts</TT></B></DT><DD CLASS="dd-description">  This option defines the hostnames of the
service (see section&#XA0;<A HREF="#modhostsoption">3.3.2</A>). If neither <TT>hosts</TT> nor
the old <TT>host</TT> is present, the prefix `<TT>vjud.</TT>' is added to all
<TT>ejabberd</TT> hostnames.

</DD><DT CLASS="dt-description"><B><TT>iqdisc</TT></B></DT><DD CLASS="dd-description"> This specifies 
the processing discipline for <TT>vcard-temp</TT> IQ queries (see section&#XA0;<A HREF="#modiqdiscoption">3.3.2</A>).
</DD><DT CLASS="dt-description"><B><TT>search</TT></B></DT><DD CLASS="dd-description">This option specifies whether the search
functionality is enabled (value: <TT>true</TT>) or disabled (value:
<TT>false</TT>). If disabled, the option <TT>hosts</TT> will be ignored and the
Jabber User Directory service will not appear in the Service Discovery item
list. The default value is <TT>true</TT>.
</DD><DT CLASS="dt-description"><B><TT>matches</TT></B></DT><DD CLASS="dd-description">With this option, the number of reported
search results can be limited. If the option's value is set to <TT>infinity</TT>,
all search results are reported. The default value is <TT>30</TT>.
</DD><DT CLASS="dt-description"><B><TT>allow_return_all</TT></B></DT><DD CLASS="dd-description">This option enables
you to specify if search operations with empty input fields should return all
users who added some information to their vCard. The default value is
<TT>false</TT>.
</DD><DT CLASS="dt-description"><B><TT>search_all_hosts</TT></B></DT><DD CLASS="dd-description">If this option is set
to <TT>true</TT>, search operations will apply to all virtual hosts. Otherwise
only the current host will be searched. The default value is <TT>true</TT>.
</DD></DL><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
In this first situation, search results are limited to twenty items,
every user who added information to their vCard will be listed when people
do an empty search, and only users from the current host will be returned:
<PRE CLASS="verbatim">  {modules,
   [
    ...
    {mod_vcard, [{search, true},
                 {matches, 20},
                 {allow_return_all, true},
                 {search_all_hosts, false}]},
    ...
   ]}.
</PRE></LI><LI CLASS="li-itemize">The second situation differs in a way that search results are not limited,
and that all virtual hosts will be searched instead of only the current one:
<PRE CLASS="verbatim">  {modules,
   [
    ...
    {mod_vcard, [{search, true},
                 {matches, infinity},
                 {allow_return_all, true}]},
    ...
   ]}.
</PRE></LI></UL><!--TOC subsection <TT>mod_vcard_ldap</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc49">3.3.22</A>&#XA0;&#XA0;<TT>mod_vcard_ldap</TT></H3><!--SEC END --><P>
<A NAME="modvcardldap"></A>
</P><P><TT>ejabberd</TT> can map LDAP attributes to vCard fields. This behaviour is
implemented in the <TT>mod_vcard_ldap</TT> module. This module does not depend on the
authentication method (see&#XA0;<A HREF="#ldapauth">3.2.5</A>). The <TT>mod_vcard_ldap</TT> module has
its own optional parameters. The first group of parameters has the same
meaning as the top-level LDAP parameters to set the authentication method:
<TT>ldap_servers</TT>, <TT>ldap_port</TT>, <TT>ldap_rootdn</TT>,
<TT>ldap_password</TT>, <TT>ldap_base</TT>, <TT>ldap_uids</TT>, and
<TT>ldap_filter</TT>. See section&#XA0;<A HREF="#ldapauth">3.2.5</A> for detailed information
about these options. If one of these options is not set, <TT>ejabberd</TT> will look
for the top-level option with the same name. The second group of parameters
consists of the following <TT>mod_vcard_ldap</TT>-specific options:</P><DL CLASS="description"><DT CLASS="dt-description">

<B><TT>hosts</TT></B></DT><DD CLASS="dd-description">  This option defines the hostnames of the
service (see section&#XA0;<A HREF="#modhostsoption">3.3.2</A>). If neither <TT>hosts</TT> nor
the old <TT>host</TT> is present, the prefix `<TT>vjud.</TT>' is added to all
<TT>ejabberd</TT> hostnames.

</DD><DT CLASS="dt-description"><B><TT>iqdisc</TT></B></DT><DD CLASS="dd-description"> This specifies 
the processing discipline for <TT>vcard-temp</TT> IQ queries (see section&#XA0;<A HREF="#modiqdiscoption">3.3.2</A>).
</DD><DT CLASS="dt-description"><B><TT>search</TT></B></DT><DD CLASS="dd-description">This option specifies whether the search
functionality is enabled (value: <TT>true</TT>) or disabled (value:
<TT>false</TT>). If disabled, the option <TT>hosts</TT> will be ignored and the
Jabber User Directory service will not appear in the Service Discovery item
list. The default value is <TT>true</TT>.
</DD><DT CLASS="dt-description"><B><TT>ldap_vcard_map</TT></B></DT><DD CLASS="dd-description">With this option you can
set the table that maps LDAP attributes to vCard fields. The format is:
<TT>[</TT><TT>Name_of_vCard_field, Pattern, List_of_LDAP_attributes</TT><TT>, ...]</TT>.
<TT>Name_of_vcard_field</TT> is the type name of the vCard as defined in
<A HREF="http://www.ietf.org/rfc/rfc2426.txt">RFC 2426</A>. <TT>Pattern</TT> is a
string which contains pattern variables <TT>"%u"</TT>, <TT>"%d"</TT> or
<TT>"%s"</TT>. <TT>List_of_LDAP_attributes</TT> is the list containing LDAP
attributes. The pattern variables <TT>"%s"</TT> will be sequentially replaced
with the values of LDAP attributes from <TT>List_of_LDAP_attributes</TT>,
<TT>"%u"</TT> will be replaced with the user part of a JID, and <TT>"%d"</TT>
will be replaced with the domain part of a JID. The default is:
<PRE CLASS="verbatim">  [{"NICKNAME", "%u", []},
   {"FN", "%s", ["displayName"]},
   {"FAMILY", "%s", ["sn"]},
   {"GIVEN", "%s", ["givenName"]},
   {"MIDDLE", "%s", ["initials"]},
   {"ORGNAME", "%s", ["o"]},
   {"ORGUNIT", "%s", ["ou"]},
   {"CTRY", "%s", ["c"]},
   {"LOCALITY", "%s", ["l"]},
   {"STREET", "%s", ["street"]},
   {"REGION", "%s", ["st"]},
   {"PCODE", "%s", ["postalCode"]},
   {"TITLE", "%s", ["title"]},
   {"URL", "%s", ["labeleduri"]},
   {"DESC", "%s", ["description"]},
   {"TEL", "%s", ["telephoneNumber"]},
   {"EMAIL", "%s", ["mail"]},
   {"BDAY", "%s", ["birthDay"]},
   {"ROLE", "%s", ["employeeType"]},
   {"PHOTO", "%s", ["jpegPhoto"]}]
</PRE></DD><DT CLASS="dt-description"><B><TT>ldap_search_fields</TT></B></DT><DD CLASS="dd-description">This option
defines the search form and the LDAP attributes to search within. The format
is: <TT>[</TT><TT>Name, Attribute</TT><TT>, ...]</TT>. <TT>Name</TT> is the name of a search form
field which will be automatically translated by using the translation
files (see <TT>msgs/*.msg</TT> for available words). <TT>Attribute</TT> is the
LDAP attribute or the pattern <TT>"%u"</TT>. The default is:
<PRE CLASS="verbatim">  [{"User", "%u"},
   {"Full Name", "displayName"},
   {"Given Name", "givenName"},
   {"Middle Name", "initials"},
   {"Family Name", "sn"},
   {"Nickname", "%u"},
   {"Birthday", "birthDay"},
   {"Country", "c"},
   {"City", "l"},
   {"Email", "mail"},
   {"Organization Name", "o"},
   {"Organization Unit", "ou"}]
</PRE></DD><DT CLASS="dt-description"><B><TT>ldap_search_reported</TT></B></DT><DD CLASS="dd-description">This option
defines which search fields should be reported. The format is:
<TT>[</TT><TT>Name, vCard_Name</TT><TT>, ...]</TT>. <TT>Name</TT> is the name of a search form
field which will be automatically translated by using the translation
files (see <TT>msgs/*.msg</TT> for available words). <TT>vCard_Name</TT> is the
vCard field name defined in the <TT>ldap_vcard_map</TT> option. The default
is:
<PRE CLASS="verbatim">  [{"Full Name", "FN"},
   {"Given Name", "GIVEN"},
   {"Middle Name", "MIDDLE"},
   {"Family Name", "FAMILY"},
   {"Nickname", "NICKNAME"},
   {"Birthday", "BDAY"},
   {"Country", "CTRY"},
   {"City", "LOCALITY"},
   {"Email", "EMAIL"},
   {"Organization Name", "ORGNAME"},
   {"Organization Unit", "ORGUNIT"}]
</PRE></DD></DL><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
<P>Let's say <TT>ldap.example.org</TT> is the name of our LDAP server. We have
users with their passwords in <TT>"ou=Users,dc=example,dc=org"</TT> directory.
Also we have addressbook, which contains users emails and their additional
infos in <TT>"ou=AddressBook,dc=example,dc=org"</TT> directory. Corresponding
authentication section should looks like this:</P><PRE CLASS="verbatim">  %% authentication method
  {auth_method, ldap}.
  %% DNS name of our LDAP server
  {ldap_servers, ["ldap.example.org"]}.
  %% We want to authorize users from 'shadowAccount' object class only
  {ldap_filter, "(objectClass=shadowAccount)"}.
</PRE><P>Now we want to use users LDAP-info as their vCards. We have four attributes
defined in our LDAP schema: <TT>"mail"</TT> &#X2014; email address, <TT>"givenName"</TT>
&#X2014; first name, <TT>"sn"</TT> &#X2014; second name, <TT>"birthDay"</TT> &#X2014; birthday.
Also we want users to search each other. Let's see how we can set it up:</P><PRE CLASS="verbatim">  {modules,
    ...
    {mod_vcard_ldap,
     [
      %% We use the same server and port, but want to bind anonymously because
      %% our LDAP server accepts anonymous requests to
      %% "ou=AddressBook,dc=example,dc=org" subtree.
      {ldap_rootdn, ""},
      {ldap_password, ""},
      %% define the addressbook's base
      {ldap_base, "ou=AddressBook,dc=example,dc=org"},
      %% uidattr: user's part of JID is located in the "mail" attribute
      %% uidattr_format: common format for our emails
      {ldap_uids, [{"mail","%u@mail.example.org"}]},
      %% We have to define empty filter here, because entries in addressbook does not
      %% belong to shadowAccount object class
      {ldap_filter, ""},
      %% Now we want to define vCard pattern
      {ldap_vcard_map,
       [{"NICKNAME", "%u", []}, % just use user's part of JID as his nickname
        {"GIVEN", "%s", ["givenName"]},
        {"FAMILY", "%s", ["sn"]},
        {"FN", "%s, %s", ["sn", "givenName"]}, % example: "Smith, John"
        {"EMAIL", "%s", ["mail"]},
        {"BDAY", "%s", ["birthDay"]}]},
      %% Search form
      {ldap_search_fields,
       [{"User", "%u"},
        {"Name", "givenName"},
        {"Family Name", "sn"},
        {"Email", "mail"},
        {"Birthday", "birthDay"}]},
      %% vCard fields to be reported
      %% Note that JID is always returned with search results
      {ldap_search_reported,
       [{"Full Name", "FN"},
        {"Nickname", "NICKNAME"},
        {"Birthday", "BDAY"}]}
    ]}
    ...
  }.
</PRE><P>Note that <TT>mod_vcard_ldap</TT> module checks an existence of the user before
searching his info in LDAP.</P></LI><LI CLASS="li-itemize"><TT>ldap_vcard_map</TT> example:
<PRE CLASS="verbatim">  {ldap_vcard_map,
   [{"NICKNAME", "%u", []},
    {"FN", "%s", ["displayName"]},
    {"CTRY", "Russia", []},
    {"EMAIL", "%u@%d", []},
    {"DESC", "%s\n%s", ["title", "description"]}
   ]},
</PRE></LI><LI CLASS="li-itemize"><TT>ldap_search_fields</TT> example:
<PRE CLASS="verbatim">  {ldap_search_fields,
   [{"User", "uid"},
    {"Full Name", "displayName"},
    {"Email", "mail"}
   ]},
</PRE></LI><LI CLASS="li-itemize"><TT>ldap_search_reported</TT> example:
<PRE CLASS="verbatim">  {ldap_search_reported,
   [{"Full Name", "FN"},
    {"Email", "EMAIL"},
    {"Birthday", "BDAY"},
    {"Nickname", "NICKNAME"}
   ]},
</PRE></LI></UL><!--TOC subsection <TT>mod_version</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc50">3.3.23</A>&#XA0;&#XA0;<TT>mod_version</TT></H3><!--SEC END --><P>
<A NAME="modversion"></A>
</P><P>This module implements Software Version (<A HREF="http://www.xmpp.org/extensions/xep-0092.html">XEP-0092</A>). Consequently, it
answers <TT>ejabberd</TT>'s version when queried.</P><P>Options:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>iqdisc</TT></B></DT><DD CLASS="dd-description"> This specifies 
the processing discipline for Software Version (<TT>jabber:iq:version</TT>) IQ queries (see section&#XA0;<A HREF="#modiqdiscoption">3.3.2</A>).
</DD></DL><!--TOC chapter Managing an ejabberd server-->
<H1 CLASS="chapter"><!--SEC ANCHOR --><A NAME="htoc51">Chapter&#XA0;4</A>&#XA0;&#XA0;Managing an ejabberd server</H1><!--SEC END --><!--TOC section Online Configuration and Monitoring-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc52">4.1</A>&#XA0;&#XA0;Online Configuration and Monitoring</H2><!--SEC END --><P>
<A NAME="onlineconfig"></A></P><!--TOC subsection Web Interface-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc53">4.1.1</A>&#XA0;&#XA0;Web Interface</H3><!--SEC END --><P>
<A NAME="webinterface"></A>
</P><P>To perform online configuration of <TT>ejabberd</TT> you need to enable the
<TT>ejabberd_http</TT> listener with the option <TT>web_admin</TT> (see
section&#XA0;<A HREF="#listened">3.1.3</A>). Then you can open 
<CODE>http://server:port/admin/</CODE> in your favourite web browser. You
will be asked to enter the username (the <EM>full</EM> Jabber ID) and password
of an <TT>ejabberd</TT> user with administrator rights. After authentication
you will see a page similar to figure&#XA0;<A HREF="#fig:webadmmain">4.1</A>.</P><BLOCKQUOTE CLASS="figure"><DIV CLASS="center"><DIV CLASS="center"><HR WIDTH="80%" SIZE=2></DIV>

<IMG SRC="webadmmain.png" ALT="webadmmain.png">


<DIV CLASS="caption"><TABLE CELLSPACING=6 CELLPADDING=0><TR><TD VALIGN=top ALIGN=left>Figure 4.1: Top page from the web interface</TD></TR>
</TABLE></DIV>
<A NAME="fig:webadmmain"></A>
<DIV CLASS="center"><HR WIDTH="80%" SIZE=2></DIV></DIV></BLOCKQUOTE><P>
Here you can edit access restrictions, manage users, create backups,
manage the database, enable/disable ports listened for, view server
statistics,&#X2026;</P><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
You can serve the web interface on the same port as the
HTTP Polling interface. In this example
you should point your web browser to <CODE>http://example.org:5280/admin/</CODE> to
administer all virtual hosts or to
<CODE>http://example.org:5280/admin/server/example.com/</CODE> to administer only
the virtual host <TT>example.com</TT>. Before you get access to the web interface
you need to enter as username, the JID and password from a registered user
that is allowed to configure <TT>ejabberd</TT>. In this example you can enter as
username `<TT>admin@example.net</TT>' to administer all virtual hosts (first
URL). If you log in with `<TT>admin@example.com</TT>' on<BR>
 <CODE>http://example.org:5280/admin/server/example.com/</CODE> you can only
administer the virtual host <TT>example.com</TT>.
<PRE CLASS="verbatim">  ...
  {acl, admins, {user, "admin", "example.net"}}.
  {host_config, "example.com", [{acl, admins, {user, "admin", "example.com"}}]}.
  {access, configure, [{allow, admins}]}.
  ...
  {hosts, ["example.org"]}.
  ...
  {listen,
   [...
    {5280, ejabberd_http, [http_poll, web_admin]},
    ...
   ]
  }.
</PRE></LI><LI CLASS="li-itemize">For security reasons, you can serve the web interface on a secured
connection, on a port differing from the HTTP Polling interface, and bind it
to the internal LAN IP. The web interface will be accessible by pointing your
web browser to <CODE>https://192.168.1.1:5280/admin/</CODE>:
<PRE CLASS="verbatim">  ...
  {hosts, ["example.org"]}.
  ...
  {listen,
   [...
    {5270, ejabberd_http,    [http_poll]},
    {5280, ejabberd_http,    [web_admin, {ip, {192, 168, 1, 1}},
                              tls, {certfile, "/usr/local/etc/server.pem"}]},
    ...
   ]
  }.
</PRE></LI></UL><!--TOC subsection <TT>ejabberdctl</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc54">4.1.2</A>&#XA0;&#XA0;<TT>ejabberdctl</TT></H3><!--SEC END --><P>
<A NAME="ejabberdctl"></A>
</P><P>It is possible to do some administration operations using the command
line tool <TT>ejabberdctl</TT>. You can list all available options by
running <TT>ejabberdctl</TT> without arguments:
</P><PRE CLASS="verbatim">% ejabberdctl
Usage: ejabberdctl node command

Available commands:
  status                        get ejabberd status
  stop                          stop ejabberd
  restart                       restart ejabberd
  reopen-log                    reopen log file
  register user server password register a user
  unregister user server        unregister a user
  backup file                   store a database backup to file
  restore file                  restore a database backup from file
  install-fallback file         install a database fallback from file
  dump file                     dump a database to a text file
  load file                     restore a database from a text file
  import-file file              import user data from jabberd 1.4 spool file
  import-dir dir                import user data from jabberd 1.4 spool directory
  registered-users              list all registered users
  delete-expired-messages       delete expired offline messages from database

Example:
  ejabberdctl ejabberd@host restart
</PRE><P>Additional information:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>reopen-log </TT></B></DT><DD CLASS="dd-description"> If you use a tool to rotate logs, you have to configure it
so that this command is executed after each rotation.
</DD><DT CLASS="dt-description"><B><TT>backup, restore, install-fallback, dump, load</TT></B></DT><DD CLASS="dd-description"> You can use these
commands to create and restore backups. 
</DD><DT CLASS="dt-description"><B><TT>import-file, import-dir</TT></B></DT><DD CLASS="dd-description"> 
These options can be used to migrate from other Jabber/XMPP servers. There
exist tutorials to <A HREF="http://ejabberd.jabber.ru/migrate-to-ejabberd">migrate from other software to ejabberd</A>.
</DD><DT CLASS="dt-description"><B><TT>delete-expired-messages</TT></B></DT><DD CLASS="dd-description"> This option can be used to delete old messages
in offline storage. This might be useful when the number of offline messages
is very high.
</DD></DL><!--TOC chapter Securing ejabberd-->
<H1 CLASS="chapter"><!--SEC ANCHOR --><A NAME="htoc55">Chapter&#XA0;5</A>&#XA0;&#XA0;Securing ejabberd</H1><!--SEC END --><!--TOC section Firewall Settings-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc56">5.1</A>&#XA0;&#XA0;Firewall Settings</H2><!--SEC END --><P>
<A NAME="firewall"></A>
</P><P>You need to take the following TCP ports in mind when configuring your firewall:
</P><BLOCKQUOTE CLASS="table"><DIV CLASS="center"><DIV CLASS="center"><HR WIDTH="80%" SIZE=2></DIV>
<TABLE BORDER=1 CELLSPACING=0 CELLPADDING=1><TR><TD ALIGN=left NOWRAP>Port</TD><TD ALIGN=left NOWRAP>Description</TD></TR>
<TR><TD ALIGN=left NOWRAP>5222</TD><TD ALIGN=left NOWRAP>SASL and unencrypted c2s connections.</TD></TR>
<TR><TD ALIGN=left NOWRAP>5223</TD><TD ALIGN=left NOWRAP>Obsolete SSL c2s connections.</TD></TR>
<TR><TD ALIGN=left NOWRAP>5269</TD><TD ALIGN=left NOWRAP>s2s connections.</TD></TR>
<TR><TD ALIGN=left NOWRAP>4369</TD><TD ALIGN=left NOWRAP>Only for clustering (see&#XA0;<A HREF="#clustering">7</A>).</TD></TR>
<TR><TD ALIGN=left NOWRAP>port range</TD><TD ALIGN=left NOWRAP>Only for clustring (see&#XA0;<A HREF="#clustering">7</A>). This range
is configurable (see&#XA0;<A HREF="#start">2.2.4</A>).</TD></TR>
</TABLE>
<DIV CLASS="center"><HR WIDTH="80%" SIZE=2></DIV></DIV></BLOCKQUOTE><!--TOC chapter Integrating ejabberd with other Instant Messaging servers-->
<H1 CLASS="chapter"><!--SEC ANCHOR --><A NAME="htoc57">Chapter&#XA0;6</A>&#XA0;&#XA0;Integrating ejabberd with other Instant Messaging servers</H1><!--SEC END --><!--TOC section SRV Records-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc58">6.1</A>&#XA0;&#XA0;SRV Records</H2><!--SEC END --><P>
<A NAME="srv"></A>
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
General information:
<A HREF="http://en.wikipedia.org/wiki/SRV_record">SRV record</A>
</LI><LI CLASS="li-itemize">Practical information:
<A HREF="http://jabberd.jabberstudio.org/2/docs/section05.html#5_7">Setting DNS SRV Records</A>
</LI></UL><!--TOC chapter Clustering-->
<H1 CLASS="chapter"><!--SEC ANCHOR --><A NAME="htoc59">Chapter&#XA0;7</A>&#XA0;&#XA0;Clustering</H1><!--SEC END --><P>
<A NAME="clustering"></A>
</P><!--TOC section How it Works-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc60">7.1</A>&#XA0;&#XA0;How it Works</H2><!--SEC END --><P>
<A NAME="howitworks"></A>
</P><P>A Jabber domain is served by one or more <TT>ejabberd</TT> nodes. These nodes can
be run on different machines that are connected via a network. They all
must have the ability to connect to port 4369 of all another nodes, and must
have the same magic cookie (see Erlang/OTP documentation, in other words the
file <TT>~ejabberd/.erlang.cookie</TT> must be the same on all nodes). This is
needed because all nodes exchange information about connected users, s2s
connections, registered services, etc&#X2026;</P><P>Each <TT>ejabberd</TT> node has the following modules:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
router,
</LI><LI CLASS="li-itemize">local router,
</LI><LI CLASS="li-itemize">session manager,
</LI><LI CLASS="li-itemize">s2s manager.
</LI></UL><!--TOC subsection Router-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc61">7.1.1</A>&#XA0;&#XA0;Router</H3><!--SEC END --><P>
<A NAME="router"></A>
</P><P>This module is the main router of Jabber packets on each node. It
routes them based on their destination's domains. It uses a global
routing table. The domain of the packet's destination is searched in the
routing table, and if it is found, the packet is routed to the
appropriate process. If not, it is sent to the s2s manager.</P><!--TOC subsection Local Router-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc62">7.1.2</A>&#XA0;&#XA0;Local Router</H3><!--SEC END --><P>
<A NAME="localrouter"></A>
</P><P>This module routes packets which have a destination domain equal to
one of this server's host names. If the destination JID has a non-empty user
part, it is routed to the session manager, otherwise it is processed depending
on its content.</P><!--TOC subsection Session Manager-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc63">7.1.3</A>&#XA0;&#XA0;Session Manager</H3><!--SEC END --><P>
<A NAME="sessionmanager"></A>
</P><P>This module routes packets to local users. It looks up to which user
resource a packet must be sent via a presence table. Then the packet is
either routed to the appropriate c2s process, or stored in offline
storage, or bounced back.</P><!--TOC subsection s2s Manager-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc64">7.1.4</A>&#XA0;&#XA0;s2s Manager</H3><!--SEC END --><P>
<A NAME="s2smanager"></A>
</P><P>This module routes packets to other Jabber servers. First, it
checks if an opened s2s connection from the domain of the packet's
source to the domain of the packet's destination exists. If that is the case,
the s2s manager routes the packet to the process
serving this connection, otherwise a new connection is opened.</P><!--TOC section Clustering Setup-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc65">7.2</A>&#XA0;&#XA0;Clustering Setup</H2><!--SEC END --><P>
<A NAME="cluster"></A>
</P><P>Suppose you already configured <TT>ejabberd</TT> on one machine named (<TT>first</TT>),
and you need to setup another one to make an <TT>ejabberd</TT> cluster. Then do
following steps:</P><OL CLASS="enumerate" type=1><LI CLASS="li-enumerate">
Copy <CODE>~ejabberd/.erlang.cookie</CODE> file from <TT>first</TT> to
<TT>second</TT>.<P>(alt) You can also add `<CODE>-cookie content_of_.erlang.cookie</CODE>'
option to all `<TT>erl</TT>' commands below.</P></LI><LI CLASS="li-enumerate">On <TT>second</TT> run the following command as the <TT>ejabberd</TT> daemon user,
in the working directory of <TT>ejabberd</TT>:<PRE CLASS="verbatim">erl -sname ejabberd \
    -mnesia extra_db_nodes "['ejabberd@first']" \
    -s mnesia
</PRE><P>This will start Mnesia serving the same database as <TT>ejabberd@first</TT>.
You can check this by running the command `<CODE>mnesia:info().</CODE>'. You
should see a lot of remote tables and a line like the following:</P><PRE CLASS="verbatim">running db nodes   = [ejabberd@first, ejabberd@second]
</PRE></LI><LI CLASS="li-enumerate">Now run the following in the same `<TT>erl</TT>' session:<PRE CLASS="verbatim">mnesia:change_table_copy_type(schema, node(), disc_copies).
</PRE><P>This will create local disc storage for the database.</P><P>(alt) Change storage type of the <TT>scheme</TT> table to `RAM and disc
copy' on the second node via the web interface.</P></LI><LI CLASS="li-enumerate">Now you can add replicas of various tables to this node with
`<CODE>mnesia:add_table_copy</CODE>' or
`<CODE>mnesia:change_table_copy_type</CODE>' as above (just replace
`<CODE>schema</CODE>' with another table name and `<CODE>disc_copies</CODE>'
can be replaced with `<CODE>ram_copies</CODE>' or
`<CODE>disc_only_copies</CODE>').<P>Which tables to replicate is very dependant on your needs, you can get
some hints from the command `<CODE>mnesia:info().</CODE>', by looking at the
size of tables and the default storage type for each table on 'first'.</P><P>Replicating a table makes lookups in this table faster on this node.
Writing, on the other hand, will be slower. And of course if machine with one
of the replicas is down, other replicas will be used.</P><P>Also <A HREF="http://www.erlang.se/doc/doc-5.4.9/lib/mnesia-4.2.2/doc/html/Mnesia_chap5.html#5.3">section 5.3 (Table Fragmentation) of Mnesia User's Guide</A> can be helpful.
</P><P>(alt) Same as in previous item, but for other tables.</P></LI><LI CLASS="li-enumerate">Run `<CODE>init:stop().</CODE>' or just `<CODE>q().</CODE>' to exit from
the Erlang shell. This probably can take some time if Mnesia has not yet
transfered and processed all data it needed from <TT>first</TT>.</LI><LI CLASS="li-enumerate">Now run <TT>ejabberd</TT> on <TT>second</TT> with almost the same config as
on <TT>first</TT> (you probably do not need to duplicate `<CODE>acl</CODE>'
and `<CODE>access</CODE>' options &#X2014; they will be taken from
<TT>first</TT>, and <CODE>mod_muc</CODE> and <CODE>mod_irc</CODE> should be
enabled only on one machine in the cluster).
</LI></OL><P>You can repeat these steps for other machines supposed to serve this
domain.</P><!--TOC section Service Load-Balancing-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc66">7.3</A>&#XA0;&#XA0;Service Load-Balancing</H2><!--SEC END --><!--TOC subsection Components Load-Balancing-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc67">7.3.1</A>&#XA0;&#XA0;Components Load-Balancing</H3><!--SEC END --><P>
<A NAME="componentlb"></A>
</P><!--TOC subsection Domain Load-Balancing Algorithm-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc68">7.3.2</A>&#XA0;&#XA0;Domain Load-Balancing Algorithm</H3><!--SEC END --><P>
<A NAME="domainlb"></A>
</P><P><TT>ejabberd</TT> includes an algorithm to load balance the components that are plugged on an ejabberd cluster. It means that you can plug one or several instances of the same component on each ejabberd cluster and that the traffic will be automatically distributed.</P><P>The default distribution algorithm try to deliver to a local instance of a component. If several local instances are available, one instance is choosen randomly. If no instance is available locally, one instance is choosen randomly among the remote component instances.</P><P>If you need a different behaviour, you can change the load balancing behaviour with the option <TT>domain_balancing</TT>. The syntax of the option is the following:</P><PRE CLASS="verbatim"> {domain_balancing, "component.example.com", &lt;balancing_criterium&gt;}.                                   
</PRE><P>Several balancing criteria are available:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
<TT>destination</TT>: the full JID of the packet <TT>to</TT> attribute is used.
</LI><LI CLASS="li-itemize"><TT>source</TT>: the full JID of the packet <TT>from</TT> attribute is used.
</LI><LI CLASS="li-itemize"><TT>bare_destination</TT>: the bare JID (without resource) of the packet <TT>to</TT> attribute is used.
</LI><LI CLASS="li-itemize"><TT>bare_source</TT>: the bare JID (without resource) of the packet <TT>from</TT> attribute is used.
</LI></UL><P>If the value corresponding to the criterium is the same, the same component instance in the cluster will be used.</P><!--TOC subsection Load-Balancing Buckets-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc69">7.3.3</A>&#XA0;&#XA0;Load-Balancing Buckets</H3><!--SEC END --><P>
<A NAME="lbbuckets"></A>
</P><P>When there is a risk of failure for a given component, domain balancing can cause service trouble. If one component is failling the service will not work correctly unless the sessions are rebalanced.</P><P>In this case, it is best to limit the problem to the sessions handled by the failling component. This is what the <TT>domain_balancing_component_number</TT> option does, making the load balancing algorithm not dynamic, but sticky on a fix number of component instances.</P><P>The syntax is the following:
</P><PRE CLASS="verbatim">    {domain_balancing_component_number, "component.example.com", N}
</PRE><!--TOC chapter Debugging-->
<H1 CLASS="chapter"><!--SEC ANCHOR --><A NAME="htoc70">Chapter&#XA0;8</A>&#XA0;&#XA0;Debugging</H1><!--SEC END --><P>
<A NAME="debugging"></A>
</P><!--TOC section Watchdog alerts-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc71">8.1</A>&#XA0;&#XA0;Watchdog alerts</H2><!--SEC END --><P>
<A NAME="watchdog"></A>
</P><P>ejabberd includes a watchdog mechanism to notify admins in realtime
through XMPP when any process consumes too much memory.</P><P>To enable the watchdog, add the <TT>watchdog_admins</TT>
 option in the config file:</P><PRE CLASS="verbatim">{watchdog_admins, [``admin@localhost'']}.
</PRE><!--TOC chapter Internationalization and Localization-->
<H1 CLASS="chapter"><!--SEC ANCHOR --><A NAME="htoc72">Appendix&#XA0;A</A>&#XA0;&#XA0;Internationalization and Localization</H1><!--SEC END --><P>
<A NAME="i18nl10n"></A>
</P><P>All built-in modules support the <TT>xml:lang</TT> attribute inside IQ queries.
Figure&#XA0;<A HREF="#fig:discorus">A.1</A>, for example, shows the reply to the following query:
</P><PRE CLASS="verbatim">  &lt;iq id='5'
      to='example.org'
      type='get'
      xml:lang='ru'&gt;
    &lt;query xmlns='http://jabber.org/protocol/disco#items'/&gt;
  &lt;/iq&gt;
</PRE><BLOCKQUOTE CLASS="figure"><DIV CLASS="center"><DIV CLASS="center"><HR WIDTH="80%" SIZE=2></DIV>

<IMG SRC="discorus.png" ALT="discorus.png">


<DIV CLASS="caption"><TABLE CELLSPACING=6 CELLPADDING=0><TR><TD VALIGN=top ALIGN=left>Figure A.1: Service Discovery when <TT>xml:lang='ru'</TT></TD></TR>
</TABLE></DIV>
<A NAME="fig:discorus"></A>
<DIV CLASS="center"><HR WIDTH="80%" SIZE=2></DIV></DIV></BLOCKQUOTE><P>The web interface also supports the <CODE>Accept-Language</CODE> HTTP header (compare
figure&#XA0;<A HREF="#fig:webadmmainru">A.2</A> with figure&#XA0;<A HREF="#fig:webadmmain">4.1</A>)</P><BLOCKQUOTE CLASS="figure"><DIV CLASS="center"><DIV CLASS="center"><HR WIDTH="80%" SIZE=2></DIV>

<IMG SRC="webadmmainru.png" ALT="webadmmainru.png">


<DIV CLASS="caption"><TABLE CELLSPACING=6 CELLPADDING=0><TR><TD VALIGN=top ALIGN=left>Figure A.2: Top page from the web interface with HTTP header
`Accept-Language: ru'</TD></TR>
</TABLE></DIV>
<A NAME="fig:webadmmainru"></A>
<DIV CLASS="center"><HR WIDTH="80%" SIZE=2></DIV></DIV></BLOCKQUOTE><!--TOC chapter Release Notes-->
<H1 CLASS="chapter"><!--SEC ANCHOR --><A NAME="htoc73">Appendix&#XA0;B</A>&#XA0;&#XA0;Release Notes</H1><!--SEC END --><P>
<A NAME="releasenotes"></A>
</P><!--TOC section ejabberd 0.9-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc74">B.1</A>&#XA0;&#XA0;ejabberd 0.9</H2><!--SEC END --><PRE CLASS="verbatim">       Release notes
        ejabberd 0.9

    This document describes the major new features of and changes to
    ejabberd 0.9, compared to latest public release ejabber 0.7.5.

    For more detailed information, please refer to ejabberd User
    Guide.


Virtual Hosting

    ejabberd now can host several domain on the same instance.
    This option is enabled by using:

      {hosts, ["erlang-projects.org", "erlang-fr.org"]}.

    instead of the previous host directive.

    Note that you are now using a list of hosts. The main one should
    be the first listed. See migration section further in this release
    note for details.
      

Shared Roster

    Shared roster is a new feature that allow the ejabberd
    administrator to add jabber user that will be present in the
    roster of every users on the server.
    Shared roster are enabled by adding:

            {mod_shared_roster, []}

    at the end of your module list in your ejabberd.cfg file.


PostgreSQL (ODBC) support

    This feature is experimental and not yet properly documented. This
    feature is released for testing purpose.

    You need to have Erlang/OTP R10 to compile with ODBC on various
    flavour of *nix. You should use Erlang/OTP R10B-4, as this task
    has became easier with this release. It comes already build in
    Erlang/OTP Microsoft Windows binary.

    PostgreSQL support is enabled by using the following module in
    ejabberd.cfg instead of their standard counterpart:

     mod_last_odbc.erl
     mod_offline_odbc.erl
     mod_roster_odbc.erl

    The database schema is located in the src/odbc/pq.sql file.

    Look at the src/ejabberd.cfg.example file for more information on
    how to configure ejabberd with odbc support. You can get support
    on how to configure ejabberd with a relational database.


Migration from ejabberd 0.7.5

    Migration is pretty straightforward as Mnesia database schema
    conversions is handled automatically. Remember however that you
    must backup your ejabberd database before migration.

    Here are the following steps to proceed:

    1. Stop your instance of ejabberd.

    2. In ejabberd.cfg, define the host lists. Change the host
    directive to the hosts one:
    Before:
      {host, "erlang-projects.org"}.
    After:
      {hosts, ["erlang-projects.org", "erlang-fr.org"]}.
    Note that when you restart the server the existing users will be
    affected to the first virtual host, so the order is important. You
    should keep the previous hostname as the first virtual host.

    3. Restart ejabberd.


Bugfixes

    This release contains several bugfixes and architectural changes.
    Please refer to the Changelog file supplied with this release for
    details of all improvements in the ejabberd code.
</PRE><!--TOC section ejabberd 0.9.1-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc75">B.2</A>&#XA0;&#XA0;ejabberd 0.9.1</H2><!--SEC END --><PRE CLASS="verbatim">       Release notes
       ejabberd 0.9.1

   This document describes the main changes from [25]ejabberd 0.9.

   The code can be downloaded from the [26]download page.

   For more detailed information, please refer to ejabberd [27]User Guide.


Groupchat (Multi-user chat and IRC) improvements

   The multi-user chat code has been improved to comply with the latest version
   of Jabber Enhancement Proposal 0045.

   The IRC (Internet Relay Chat) features now support WHOIS and USERINFO
   requests.


Web interface

   ejabberd modules management features have been added to the web interface.
   They now allow to start or stop extension module without restarting the
   ejabberd server.


Publish and subscribe

   It is now possible to a subscribe node with a JabberID that includes a
   resource.


Translations

   A new script has been included to help translate ejabberd into new languages
   and maintain existing translations.

   As a result, ejabberd is now translating into 10 languages:
     * Dutch
     * English
     * French
     * German
     * Polish
     * Portuguese
     * Russian
     * Spanish
     * Swedish
     * Ukrainian


Migration

   No changes have been made to the database. No particular conversion steps
   are needed. However, you should backup your database before upgrading to a
   new ejabberd version.


Bugfixes

   This release contains several bugfixes and architectural changes. Please
   refer to the Changelog file supplied with this release for details of all
   improvements in the ejabberd code.
</PRE><!--TOC section ejabberd 0.9.8-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc76">B.3</A>&#XA0;&#XA0;ejabberd 0.9.8</H2><!--SEC END --><PRE CLASS="verbatim">       Release notes
       ejabberd 0.9.8
         2005-08-01

   This document describes the main changes in ejabberd 0.9.8. This
   version prepares the way for the release of ejabberd 1.0, which 
   is due later this year.

   The code can be downloaded from the Process-one website:
   http://www.process-one.net/en/projects/ejabberd/

   For more detailed information, please refer to ejabberd User Guide
   on the Process-one website:
   http://www.process-one.net/en/projects/ejabberd/docs.html


   Recent changes include....


Enhanced virtual hosting

   Virtual hosting applies to many more setting options and
   features and is transparent. Virtual hosting accepts different
   parameters for different virtual hosts regarding the following
   features: authentication method, access control lists and access
   rules, users management, statistics, and shared roster. The web
   interface gives access to each virtual host's parameters.


Enhanced Publish-Subscribe module

   ejabberd's Publish-Subscribe module integrates enhancements
   coming from J-EAI, an XMPP-based integration server built on
   ejabberd. ejabberd thus supports Publish-Subscribe node
   configuration. It is possible to define nodes that should be
   persistent, and the number of items to persist. Besides that, it
   is also possible to define various notification parameters, such
   as the delivery of the payload with the notifications, and the
   notification of subscribers when some changes occur on items.
   Other examples are: the maximum size of the items payload, the
   subscription approvers, the limitation of the notification to
   online users only, etc.


Code reorganisation and update

   - The mod_register module has been cleaned up.
   - ODBC support has been updated and several bugs have been fixed.


Development API

   To ease the work of Jabber/XMPP developers, a filter_packet hook
   has been added. As a result it is possible to develop plugins to
   filter or modify packets flowing through ejabberd.


Translations

   - Translations have been updated to support the new Publish-Subscribe features.
   - A new Brazilian Portuguese translation has been contributed.


Web interface

   - The CSS stylesheet from the web interface is W3C compliant.


Installers

   Installers are provided for Microsoft Windows and Linux/x86. The
   Linux installer includes Erlang ASN.1 modules for LDAP
   authentication support.


Bugfixes

   - This release contains several bugfixes and architectural
     changes. Among other bugfixes include improvements in LDAP
     authentication. Please refer to the ChangeLog file supplied 
     with this release regarding all improvements in ejabberd.


References

   The ejabberd feature sheet helps comparing with other Jabber/XMPP 
   servers:
   http://www.process-one.net/en/projects/ejabberd/docs/features.pdf

   Contributed tutorials of interest are:
   - Migration from Jabberd1.4 to ejabberd:
     http://ejabberd.jabber.ru/jabberd1-to-ejabberd
   - Migration from Jabberd2 to ejabberd:
     http://ejabberd.jabber.ru/jabberd2-to-ejabberd
   - Transport configuration for connecting to other networks:
     http://ejabberd.jabber.ru/tutorials-transports

END

</PRE><!--TOC section ejabberd 1.0.0-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc77">B.4</A>&#XA0;&#XA0;ejabberd 1.0.0</H2><!--SEC END --><PRE CLASS="verbatim">       Release Notes
       ejabberd 1.0.0
       14 December 2005

   This document describes the main changes in ejabberd 1.0.0. Unique in this
   version is the compliancy with the XMPP (eXtensible Messaging and Presence
   Protocol) standard. ejabberd is the first Open Source Jabber server claiming
   to fully comply to the XMPP standard.

   ejabberd can be downloaded from the Process-one website:
   http://www.process-one.net/en/projects/ejabberd/

   Detailed information can be found in the ejabberd Feature Sheet and User
   Guide which are available on the Process-one website:
   http://www.process-one.net/en/projects/ejabberd/docs.html


   Recent changes include:


Server-to-server Encryption for Enhanced Security

  - Support for STARTTLS and SASL EXTERNAL to secure server-to-server traffic
    has been added.
  - Also, STARTTLS and Dialback has been implemented for server-to-server (s2s)
    connections. Detailed information about these new features can be found on
    http://ejabberd.jabber.ru/s2s-encryption
  - commonName and dNSName fields matching were introduced to ease the process
    of retrieving certificates.
  - Different certificates can be defined for each virtual host.

ODBC Support

  - ODBC support has been improved to allow production use of ejabberd with
    relational databases.
  - Support for vCard storage in ODBC has been added.
  - ejd2odbc.erl is a tool to convert an installation from Erlang's database
    Mnesia to an ODBC compatible relational database.

Native PostgreSQL Support

  - Native PostgreSQL support gives you a better performance when you use
    PostgreSQL.

Shared Roster groups

  - Shared Roster groups support has been enhanced. New is the ability to add
    all registered users to everyone's roster. Detailed information about this
    new feature can be found on http://ejabberd.jabber.ru/shared-roster-all

Web Interface

   - The web interface internal code has been modified for better integration
     and compliancy with J-EAI, an ejabberd-based Enterprise Application
     Integration platform.
   - More XHTML 1.0 Transitional compliancy work was done.

Transports

   - A transport workaround can be enabled during compilation. To do this, you
     can pass the "--enable-roster-gateway-workaround" option to the configure
     script. (./configure --enable-roster-gateway-workaround)
     This option allows transports to add items with subscription "to" in the
     roster by sending &lt;presence type='subscribed'/&gt; stanza to user. This option
     is only needed for JIT ICQ transport.
     Warning: by enabling this option, ejabberd will not be fully XMPP compliant
              anymore.

Documentation and Internationalization

   - Documentation has been extended to cover more topics.
   - Translations have been updated.

Bugfixes

   - This release contains several bugfixes.
   - Among other bugfixes include improvements to the client-to-server (c2s)
     connection management module.
   - Please refer to the ChangeLog file supplied
     with this release regarding all improvements in ejabberd.


   Installation Notes


Supported Erlang Version

   - You need at least Erlang/OTP R9C to run ejabberd 1.0.0.

Installation

   Installers are provided for Microsoft Windows and Linux/x86.
   Installers can be retrieved from:
   http://www.process-one.net/en/projects/ejabberd/download.html

Migration Notes

   - Before any migration, ejabberd system and database must be properly
     backed up.
   - When upgrading an ODBC-based installation, you will need to change the
     relational database schema. The following SQL commands must be run on the
     database:
       CREATE SEQUENCE spool_seq_seq;
       ALTER TABLE spool ADD COLUMN seq integer;
       ALTER TABLE spool ALTER COLUMN seq SET DEFAULT nextval('spool_seq_seq');
       UPDATE spool SET seq = DEFAULT;
       ALTER TABLE spool ALTER COLUMN seq SET NOT NULL;

References

   Contributed tutorials of interest are:
   - Migration from Jabberd1.4 to ejabberd:
     http://ejabberd.jabber.ru/jabberd1-to-ejabberd
   - Migration from Jabberd2 to ejabberd:
     http://ejabberd.jabber.ru/jabberd2-to-ejabberd
   - Transport configuration for connecting to other networks:
     http://ejabberd.jabber.ru/tutorials-transports

END

</PRE><!--TOC section ejabberd 1.1.0-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc78">B.5</A>&#XA0;&#XA0;ejabberd 1.1.0</H2><!--SEC END --><PRE CLASS="verbatim">    Release Notes
    ejabberd 1.1.0
    24 April 2006

   This document describes the main changes in ejabberd 1.1.0. This version
   introduce new features including support for new Jabber Enhancement
   Proposals and several performance improvements enabling deployments on an
   even larger scale than already possible.

   ejabberd can be downloaded from the Process-one website:
   http://www.process-one.net/en/projects/ejabberd/

   Detailed information can be found in the ejabberd Feature Sheet and User
   Guide which are available on the Process-one website:
   http://www.process-one.net/en/projects/ejabberd/docs.html

   A complete list of changes is available from:
   http://support.process-one.net/secure/ReleaseNote.jspa?projectId=10011&amp;styleName=Html&amp;version=10025


   Recent changes include:


New Jabber Enhancement Proposal support:

  - JEP-0050: Ad-Hoc Commands.
  - JEP-0138: Stream Compression.
  - JEP-0175: SASL anonymous.

Anonymous login

  - SASL anonymous.
  - Anonymous login for clients that do not yet support SASL Anonymous.
  
Relational database Support

  - MySQL is now fully supported through ODBC and in native mode.
  - Various improvements to the native database interfaces.
  - The migration tool can use relational databases.

Multi-User Chat improvements

  - Logging of room discussion to text file is now supported.
  - Better reconfiguration support.
  - Security oriented fixes.
  - Several improvements and updates to latest JEP-0045.

Performance scalability improvements for large clusters

  - Improved session synchronisation management between cluster nodes.
  - Internal architecture has been reworked to use generalize Erlang/OTP
    framework usage.
  - Speed improvement on logger.
  - TCP/IP packet reception change for better network throttling and
    regulation.
  As a result, these improvements will reduce load on large scale deployments.

XMPP Protocol related improvements

  - XML stanza size can be limited.
  - Messages are send to all resources with the same highest priority.

Documentation and Internationalization

   - Documentation has been extended to cover more topics.
   - Translations have been updated.

Web interface

   - XHTML 1.0 compliance.

Bugfixes

   - This release contains many bugfixes on various areas such as Publish-Subscribe, build
     chain, installers, IRC gateway, ejabberdctl, amongst others.
   - Please refer to the ChangeLog file supplied with this release regarding
     all improvements in ejabberd.


   Installation Notes

Supported Erlang Version

   - You need at least Erlang/OTP R9C-2 to run ejabberd 1.1.0.

Installation

   Installers are provided for Microsoft Windows, Linux/x86 and MacOSX/PPC.
   Installers can be retrieved from:
   http://www.process-one.net/en/projects/ejabberd/download.html

Migration Notes

   - Before any migration, ejabberd system and database must be properly
     backed up.
   - The database schema has not been changed comparing to version 1.0.0 and
     consequently it does not require any migration.


References

   Contributed tutorials and documents of interest are:
   - Migration from Jabberd1.4, Jabberd2 and WPJabber to ejabberd:
     http://ejabberd.jabber.ru/migrate-to-ejabberd     
   - Transport configuration for connecting to other networks:
     http://ejabberd.jabber.ru/tutorials-transports
   - Using ejabberd with MySQL native driver:
     http://support.process-one.net/doc/display/MESSENGER/Using+ejabberd+with+MySQL+native+driver
   - Anonymous User Support:
     http://support.process-one.net/doc/display/MESSENGER/Anonymous+users+support
   - Frequently Asked Questions:
     http://ejabberd.jabber.ru/faq

END
</PRE><!--TOC section ejabberd 1.1.1-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc79">B.6</A>&#XA0;&#XA0;ejabberd 1.1.1</H2><!--SEC END --><PRE CLASS="verbatim">    Release Notes
    ejabberd 1.1.1 
    28 April 2006

   This document describes the main changes in ejabberd 1.1.x. This version
   introduce new features including support for new Jabber Enhancement
   Proposals and several performance improvements enabling deployments on an
   even larger scale than already possible.

   This release fix a security issue introduced in ejabberd 1.1.0. In SASL
   mode, anonymous login was enabled as a default. Upgrading ejabberd 1.1.0 to
   ejabberd 1.1.1 is highly recommended.

   ejabberd can be downloaded from the Process-one website:
   http://www.process-one.net/en/projects/ejabberd/

   Detailed information can be found in the ejabberd Feature Sheet and User
   Guide which are available on the Process-one website:
   http://www.process-one.net/en/projects/ejabberd/docs.html

   A complete list of changes is available from:
   http://support.process-one.net/secure/ReleaseNote.jspa?projectId=10011&amp;styleName=Html&amp;version=10025


   Recent changes include:


New Jabber Enhancement Proposal support:

  - JEP-0050: Ad-Hoc Commands.
  - JEP-0138: Stream Compression.
  - JEP-0175: SASL anonymous.

Anonymous login

  - SASL anonymous.
  - Anonymous login for clients that do not yet support SASL Anonymous.
  
Relational database Support

  - MySQL is now fully supported through ODBC and in native mode.
  - Various improvements to the native database interfaces.
  - The migration tool can use relational databases.

Multi-User Chat improvements

  - Logging of room discussion to text file is now supported.
  - Better reconfiguration support.
  - Security oriented fixes.
  - Several improvements and updates to latest JEP-0045.

Performance scalability improvements for large clusters

  - Improved session synchronisation management between cluster nodes.
  - Internal architecture has been reworked to use generalize Erlang/OTP
    framework usage.
  - Speed improvement on logger.
  - TCP/IP packet reception change for better network throttling and
    regulation.
  As a result, these improvements will reduce load on large scale deployments.

XMPP Protocol related improvements

  - XML stanza size can be limited.
  - Messages are send to all resources with the same highest priority.

Documentation and Internationalization

   - Documentation has been extended to cover more topics.
   - Translations have been updated.

Web interface

   - XHTML 1.0 compliance.

Bugfixes

   - This release contains many bugfixes on various areas such as Publish-Subscribe, build
     chain, installers, IRC gateway, ejabberdctl, amongst others.
   - Please refer to the ChangeLog file supplied with this release regarding
     all improvements in ejabberd.


   Installation Notes

Supported Erlang Version

   - You need at least Erlang/OTP R9C-2 to run ejabberd 1.1.0.

Installation

   Installers are provided for Microsoft Windows, Linux/x86 and MacOSX/PPC.
   Installers can be retrieved from:
   http://www.process-one.net/en/projects/ejabberd/download.html

Migration Notes

   - Before any migration, ejabberd system and database must be properly
     backed up.
   - The database schema has not been changed comparing to version 1.0.0 and
     consequently it does not require any migration.


References

   Contributed tutorials and documents of interest are:
   - Migration from Jabberd1.4, Jabberd2 and WPJabber to ejabberd:
     http://ejabberd.jabber.ru/migrate-to-ejabberd     
   - Transport configuration for connecting to other networks:
     http://ejabberd.jabber.ru/tutorials-transports
   - Using ejabberd with MySQL native driver:
     http://support.process-one.net/doc/display/MESSENGER/Using+ejabberd+with+MySQL+native+driver
   - Anonymous User Support:
     http://support.process-one.net/doc/display/MESSENGER/Anonymous+users+support
   - Frequently Asked Questions:
     http://ejabberd.jabber.ru/faq

END
</PRE><!--TOC section ejabberd 1.1.2-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc80">B.7</A>&#XA0;&#XA0;ejabberd 1.1.2</H2><!--SEC END --><PRE CLASS="verbatim">    Release Notes
    ejabberd 1.1.2
         27 September 2006

   This document describes the main changes in ejabberd 1.1.2.

   This version is a major improvement over ejabberd 1.1.1, improving the
   overall behaviour of the server in many areas. Users of ejabberd 1.1.1
   should upgrade to this new release for improved robustness and compliance.

   ejabberd can be downloaded from the Process-one website:
   http://www.process-one.net/en/projects/ejabberd/

   Detailed information can be found in the Feature Sheet and in the
   Installation and Operation Guide which are both available on the
   Process-one website:
   http://www.process-one.net/en/projects/ejabberd/docs.html

   ejabberd includes 44 improvements. A complete list of changes can be
   retrieved from:
   http://redir.process-one.net/ejabberd-1.1.2


   Recent changes include:

LDAP Improvements

  - Major improvements have been made on the LDAP module. It is now more
    flexible and more robust.

HTTP Polling Fixes

  - The HTTP polling modules have been fixed and improved: the connections are
    closed properly and polled messages cannot be lost anymore.

Roster Management Improvement

  - Roster management improvements increase reliability, especially in cases
  where users are on different servers.
  - Shared rosters are more reliable.

Improved Robustness

  - It is now possible to limit the number of opened connections for a single
  user.

Relational databases

  - Database support: Microsoft SQL Server is now officially supported in ODBC
  mode.

Publish-Subscribe Improvement

  - Restricting node creation with a dedicated ACL rule is now possible.

Localization

  - A Czech translation has been added.
  - Translations have been updated.

Binary Installer

  - New binary installer for Windows including all requirements.
  - Improved installers for Linux and MacOSX (PowerPC)

XMPP Compliancy

  - Some protocol compliance fix have been added, after the Portland XMPP
    Interop Meeting in July.

Miscelanous

  - MUC have been improved (logging rendering).
  - The command line tool ejabberdctl has been improved.
  - The build chain has been improved, including MacOSX support.
  - The documentation has been improved and updated to describe the new
    features.

Bugfixes

   - Anonymous login bugfixes.
   - Please refer to the ChangeLog file supplied with this release regarding
     all improvements in ejabberd.


   Installation Notes

Supported Erlang Version

   - You need at least Erlang/OTP R9C-2 to run ejabberd 1.1.2.
   - The recommanded version is Erlang/OTP R10B-10.
   - Erlang/OTP R11B has not yet been fully certified for ejabberd.

Installation

   Installers are provided for Microsoft Windows, Linux/x86 and MacOSX/PPC.
   They can be retrieved from:
   http://www.process-one.net/en/projects/ejabberd/download.html

Migration Notes

   - Before any migration, ejabberd system and database must be properly
   backed up.
   - The relational database schema has changed between version 1.1.1 and
   1.1.2. An "askmessage" column needs to be added in the "rosterusers" table
   to perform the migration.


References

   Contributed tutorials and documents of interest are:
   - Migration from other XMPP servers to ejabberd:
     http://ejabberd.jabber.ru/migrate-to-ejabberd     
   - Transport configuration for connecting to other networks:
     http://ejabberd.jabber.ru/tutorials-transports
   - Frequently Asked Questions:
     http://ejabberd.jabber.ru/faq

END
</PRE><!--TOC chapter Acknowledgements-->
<H1 CLASS="chapter"><!--SEC ANCHOR --><A NAME="htoc81">Appendix&#XA0;C</A>&#XA0;&#XA0;Acknowledgements</H1><!--SEC END --><P>
<A NAME="acknowledgements"></A>
Thanks to all people who contributed to this guide:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
Alexey Shchepin (<A HREF="xmpp:aleksey@jabber.ru"><TT>xmpp:aleksey@jabber.ru</TT></A>)
</LI><LI CLASS="li-itemize">Badlop (<A HREF="xmpp:badlop@jabberes.org"><TT>xmpp:badlop@jabberes.org</TT></A>)
</LI><LI CLASS="li-itemize">Evgeniy Khramtsov (<A HREF="xmpp:xram@jabber.ru"><TT>xmpp:xram@jabber.ru</TT></A>)
</LI><LI CLASS="li-itemize">Florian Zumbiehl (<A HREF="xmpp:florz@florz.de"><TT>xmpp:florz@florz.de</TT></A>)
</LI><LI CLASS="li-itemize">Michael Grigutsch (<A HREF="xmpp:migri@jabber.i-pobox.net"><TT>xmpp:migri@jabber.i-pobox.net</TT></A>)
</LI><LI CLASS="li-itemize">Mickael Remond (<A HREF="xmpp:mremond@erlang-projects.org"><TT>xmpp:mremond@erlang-projects.org</TT></A>)
</LI><LI CLASS="li-itemize">Sander Devrieze (<A HREF="xmpp:sander@devrieze.dyndns.org"><TT>xmpp:sander@devrieze.dyndns.org</TT></A>)
</LI><LI CLASS="li-itemize">Sergei Golovan (<A HREF="xmpp:sgolovan@nes.ru"><TT>xmpp:sgolovan@nes.ru</TT></A>)
</LI><LI CLASS="li-itemize">Vsevolod Pelipas (<A HREF="xmpp:vsevoload@jabber.ru"><TT>xmpp:vsevoload@jabber.ru</TT></A>)
</LI></UL><!--TOC chapter Copyright Information-->
<H1 CLASS="chapter"><!--SEC ANCHOR --><A NAME="htoc82">Appendix&#XA0;D</A>&#XA0;&#XA0;Copyright Information</H1><!--SEC END --><P>
<A NAME="copyright"></A></P><P>Ejabberd Installation and Operation Guide.<BR>
Copyright &#XA9; January 23, 2003 &#X2014;  Alexey Shchepin</P><P>This document is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.</P><P>This document is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.</P><P>You should have received a copy of the GNU General Public License along with
this document; if not, write to the Free Software Foundation, Inc., 51 Franklin
Street, Fifth Floor, Boston, MA 02110-1301, USA.</P><!--CUT END -->
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