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<!-- Module User's Guide -->

<chapter>
    
    <title>&adminguide;</title>
    
    <section>
	<title>Overview</title>
	<para>
		This module allows real-time queries against the Max Mind GeoIP2 
		database to be performed from the config script.  
	</para>
	<para>
		The Max Mind GeoIP2 database is a map of IP network address assignments 
		to geographical locales that can be useful -- though approximate --
		in identifying the physical location with which an IP host address
		is associated on a relatively granular level.
	</para>
	<para>
		This database itself can be obtained on a free or commercial basis 
		from <ulink url="http://dev.maxmind.com/geoip/">
		http://dev.maxmind.com/geoip/</ulink>. The 
		library libmaxminddb
		that interfaces with the Max Mind API, as well as scripts to
		automate downloading of the on-disk version are available at
		<ulink url="http://dev.maxmind.com/geoip/geoip2/downloadable/">
		http://dev.maxmind.com/geoip/geoip2/downloadable/</ulink>.
	</para>
	<para>
		This module exports a new class of pseudo-variables -
		$gip2(pvc=&gt;key) - to enable access to the results of a query to the
		database.
	</para>
	<para>
		Many queries can be done and store results in different containers to
		be able to use in parallel. Database is loaded at startup in cache.
	</para>
    </section>
    <section>
	<title>Dependencies</title>
	<section>
	    <title>&kamailio; Modules</title>
	    <para>
		The following modules must be loaded before this module:
	    	<itemizedlist>
		    <listitem>
			<para>
			    <emphasis>none</emphasis>.
			</para>
		    </listitem>
	    	</itemizedlist>
	    </para>
	</section>
	<section>
	    <title>External Libraries or Applications</title>
	    <para>
		The following libraries or applications must be installed before running
		&kamailio; with this module loaded:
	    	<itemizedlist>
		    <listitem>
			<para>
			    <emphasis>libmaxminddb</emphasis> - the GeoIP2 library.
			</para>
		    </listitem>
	    	</itemizedlist>
	    </para>
	</section>
    </section>
    <section>
	<title>Parameters</title>
	<section>
	    <title><varname>path</varname> (string)</title>
	    <para>
		Path to the GeoIP2 database file.
	    </para>
	    <para>
		<emphasis>
		    Default value is <quote>null</quote>.
		</emphasis>
	    </para>
	    <example>
		<title>Set <varname>path</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("geoip2", "path", "/usr/local/share/GeoIP/GeoLite2-City.mmdb")
...
</programlisting>
	    </example>
	</section>

	</section>
	
    <section>
	<title>Functions</title>
 	<section>
	    <title>
		<function moreinfo="none">geoip2_match(ipaddr, pvc)</function>
	    </title>
	    <para>
			Match ipaddr against the GeoIP database and set the pvc container. The
			function has to be called before accessing a key via: $gip2(pvc=&gt;key).
	    </para>
		<example>
		<title><function>geoip2_match</function> usage</title>
		<programlisting format="linespecific">
...
if(geoip2_match("$si", "src"))
    xlog("SIP message from: $gip2(src=&gt;cc)\n");
...
</programlisting>
	    </example>
	</section>
	
    </section>
	
	<section>
		<title>Exported pseudo-variables</title>
		<itemizedlist>
			<listitem><para>
				<emphasis>$gip2(pvc=&gt;key)</emphasis> - <emphasis>pvc</emphasis> is an 
				identifier for this query result;  it is designated by the second 
				parameter of geoip2_match(). The <emphasis>key</emphasis> can be one of
				the following:
				</para>
			<itemizedlist>
				<listitem><para>
					<emphasis>cc</emphasis> - country code
				</para></listitem>
				<listitem><para>
					<emphasis>tz</emphasis> - time zone
				</para></listitem>
				<listitem><para>
					<emphasis>zip</emphasis> - postal code
				</para></listitem>
				<listitem><para>
					<emphasis>lat</emphasis> - latitude
				</para></listitem>
				<listitem><para>
					<emphasis>lon</emphasis> - longitude
				</para></listitem>
				<listitem><para>
					<emphasis>nmask</emphasis> - network mask (CIDR format)
				</para></listitem>
				<listitem><para>
					<emphasis>city</emphasis> - city
				</para></listitem>
				<listitem><para>
					<emphasis>regc</emphasis> - region
				</para></listitem>
				<listitem><para>
					<emphasis>regn</emphasis> - region name
				</para></listitem>
				<listitem><para>
					<emphasis>metro</emphasis> - metro code
				</para></listitem>
				<listitem><para>
					<emphasis>contc</emphasis> - continent code
				</para></listitem>
			</itemizedlist>
			</listitem>
		</itemizedlist>
		<para>
		Exported pseudo-variables are documented at &kamwikilink;.
		</para>
	</section>

</chapter>

