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<title>ProFTPD module mod_unique_id</title>
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<h2><b>ProFTPD module <code>mod_unique_id</code></b></h2>
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<hr><br>

<p>
The <code>mod_unique_id</code> module attempts to generate a unique ID for
every FTP session.  To make the ID unique across multiple servers, the
following bits of information are used:
<ul>
  <li>host IP address
  <li>client IP address
  <li>process ID
  <li>time of day (including microseconds)
</ul>
The generated ID is stored in the <code>UNIQUE_ID</code> environment variable
in a printable form; other modules can retrieve the unique session ID from the
environment.  (Note that you will want <code>mod_unique_id</code> listed toward
the <i>end</i> of your <code>--with-modules</code> configure list, so that the
ID generation runs early in the session establishment process.)  The contents
of the <code>UNIQUE_ID</code> should be considered opaque, and are subject
to change in the future.

<p>
This module is contained in the <code>mod_unique_id</code> file for
ProFTPD 1.3.<i>x</i>, and is not compiled by default.  Installation
instructions are discussed <a href="#Installation">here</a>.

<p>
The most current version of <code>mod_unique_id</code> is distributed with
the <code>proftpd</code> source code.

<h2>Author</h2>
<p>
Please contact TJ Saunders &lt;tj <i>at</i> castaglia.org&gt; with any
questions, concerns, or suggestions regarding this module.

<h2>Directives</h2>
<ul>
  <li><a href="#UniqueIDEngine">UniqueIDEngine</a>
</ul>

<hr>
<h3><a name="UniqueIDEngine">UniqueIDEngine</a></h3>
<strong>Syntax:</strong> UniqueIDEngine <em>on|off</em><br>
<strong>Default:</strong> <em>on</em><br>
<strong>Context:</strong> server config<br>
<strong>Module:</strong> mod_unique_id<br>
<strong>Compatibility:</strong> 1.3.1rc1 and later

<p>
The <code>UniqueIDEngine</code> directive enables or disables the module's
generation of a unique ID for each FTP session.

<p>
By default, <code>UniqueIDEngine</code> is <em>on</em>.

<p>
<hr>
<h2><a name="Installation">Installation</a></h2>
The <code>mod_unique_id</code> module is distributed with ProFTPD.  For
including <code>mod_unique_id</code> as a staticly linked module, use:
<pre>
  $ ./configure --with-modules=mod_unique_id
</pre>
Alternatively, <code>mod_unique_id</code> could be built as a DSO module:
<pre>
  $ ./configure --with-shared=mod_unique_id
</pre>
Then follow the usual steps:
<pre>
  $ make
  $ make install
</pre>

<p>
Alternatively, if your <code>proftpd</code> was compiled with DSO support, you
can use the <code>prxs</code> tool to build <code>mod_unique_id</code> as a
shared module:
<pre>
  $ prxs -c -i -d mod_unique_id.c
</pre>

<p>
<hr>
<h2><a name="Usage">Usage</a></h2>
<p>
Since <code>mod_unique_id</code> generates a new unique ID for each session
by default, there is no special configuration needed for enabling the
module.  Taking advantage of <code>mod_unique_id</code>, however, requires
some adjustments in other parts of your <code>proftpd.conf</code>.

<p>
Example configuration:
<pre>
  &lt;IfModule mod_unique_id.c&gt;

# Include the unique session ID in an ExtendedLog
    LogFormat session "%{UNIQUE_ID}e %h %l %u %t \"%r\" %s %b"
    ExtendedLog /path/to/extended.log ALL session

# Store the unique ID in a SQL table named 'ftpsessions'
    SQLLog PASS login
    SQLNamedQuery login INSERT "'%{env:UNIQUE_ID}', '%u', now()" ftpsessions

&lt;/IfModule&gt;
</pre>

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