pike_user.sgml

用来作为linux中SIP SERVER,完成VOIP网络电话中服务器的功能

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

<chapter>
    <chapterinfo>
	<revhistory>
	    <revision>
		<revnumber>$Revision: 1.2 $</revnumber>
		<date>$Date: 2004/08/24 09:00:35 $</date>
	    </revision>
	</revhistory>
    </chapterinfo>
    <title>User's Guide</title>
    
    <section>
	<title>Overview</title>
	<para>
	    The module keeps trace of all (or selected ones) incoming request's &ip; source
	    and blocks the ones that exceeded some limit. Works simultaneous for IPv4 and
	    IPv6 addresses.
	</para>
    </section>
    <section>
	<title>Dependencies</title>
	<section>
	    <title>&ser; Modules</title>
	    <para>
		The following modules must be loaded before this module:
	    	<itemizedlist>
		    <listitem>
			<para>
			    <emphasis>No dependencies on other &ser; modules</emphasis>.
			</para>
		    </listitem>
	    	</itemizedlist>
	    </para>
	</section>
	<section>
	    <title>External Libraries or Applications</title>
	    <para>
		The following libraries or applications must be installed before running
		&ser; with this module loaded:
	    	<itemizedlist>
		    <listitem>
			<para>
			    <emphasis>None</emphasis>.
			</para>
		    </listitem>
	    	</itemizedlist>
	    </para>
	</section>
    </section>
    <section>
	<title>Exported Parameters</title>
	<section>
	    <title><varname>sampling_time_unit</varname> (integer)</title>
	    <para>
		Time period used for sampling (or the sampling accuracy ;-) ). The smaller the
		better, but slower. If you want to detect peeks, use a small one. To limit the
		access (like total number of requests on a long period of time) to a proxy resource
		(a gateway for ex), use a bigger value of this parameter.
	    </para>
	    <para>
		<emphasis>
		    Default value is 2.
		</emphasis>
	    </para>
	    <example>
		<title>Set <varname>sampling_time_unit</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("pike", "sampling_time_unit", 10)
...
</programlisting>
	    </example>
	</section>
	<section>
	    <title><varname>reqs_density_per_unit</varname> (integer)</title>
	    <para>
		How many requests should be allowed per sampling_time_unit before blocking all the
		incoming request from that &ip;. Practically, the blocking limit is between ( let's
		have x=reqs_density_per_unit) x and 3*x for IPv4 addresses and between x and 8*x for
		ipv6 addresses.
	    </para>
	    <para>
		<emphasis>
		    Default value is 30.
		</emphasis>
	    </para>
	    <example>
		<title>Set <varname>reqs_density_per_unit</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("pike", "reqs_density_per_unit", 30)
...
</programlisting>
	    </example>
	</section>
	<section>
	    <title><varname>remove_latency</varname> (integer)</title>
	    <para>
		For how long the &ip; address will be kept in memory after the last request from
		that &ip; address. It's a sort of timeout value.
	    </para>
	    <para>
		<emphasis>
		    Default value is 120.
		</emphasis>
	    </para>
	    <example>
		<title>Set <varname>remove_latency</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("pike", "remove_latency", 130)
...
</programlisting>
	    </example>
	</section>
    </section>
    <section>
	<title>Exported Functions</title>
	<section>
	    <title>
		<function moreinfo="none">pike_check_req()</function>
	    </title>
	    <para>
		Process the source &ip; of the current request and returns false if the &ip; was
		exceeded the blocking limit.
	    </para>
	    <para>Meaning of the parameters is as follows:</para>
	    <example>
		<title><function>pike_check_req</function> usage</title>
		<programlisting format="linespecific">
...
if (!pike_check_req()) { break; };
...
</programlisting>
	    </example>
	</section>
    </section>
</chapter>

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