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<!DOCTYPE html>
<html>
<head>
<title>ProFTPD module mod_ifversion</title>
</head>

<hr>
<center>
<h2><b>ProFTPD module <code>mod_ifversion</code></b></h2>
</center>
<hr><br>

<p>
The <code>mod_ifversion</code> module is designed for use in testsuites and
production deployments of <code>proftpd</code>, which may have to deal with
different ProFTPD versions and different configurations.  The
<code>&lt;IfVersion&gt;</code> sections supported by <code>mod_ifversion</code>
allow flexible version checking, including numeric and regular expression
comparisons.

<p>
This module is contained in the <code>mod_ifversion.c</code> file for
ProFTPD 1.3.<i>x</i>, and is not compiled by default.  Installation
instructions are discussed <a href="#Installation">here</a>; a discussion
on <a href="#Usage">usage</a> is also available.

<p>
The most current version of <code>mod_ifversion</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="#IfVersion">&lt;IfVersion&gt;</a>
</ul>

<hr>
<h3><a name="IfVersion">&lt;IfVersion&gt;</a></h3>
<strong>Syntax:</strong> &lt;IfVersion <em>[[!]operator] version</em>&gt;<br>
<strong>Default:</strong> None<br>
<strong>Context:</strong> <em>All</em><br>
<strong>Module:</strong> mod_ifversion<br>
<strong>Compatibility:</strong> 1.3.1rc1 and later

<p>
The <code>&lt;IfVersion&gt;</code> section encloses configuration directives
which will be used only if the proftpd version matches the configured criteria.
For normal (numeric) comparisons the version argument has the following
syntax:
<pre>
  <i>major[.minor[.revision[suffix]]]</i>
</pre>
<i>e.g.</i> 1.3.1, 1.3.2a, or 1.3.3rc1. If the <em>minor</em> or
<em>revision</em> fields are omitted, they are assumed to be zero.  An
omitted suffix is assumed to be a stable release, instead of a release
candidate (RC) or maintenance release.

<p>
The following numerical comparison operators are supported:
<p>
<table border=1 summary="Numeric Comparators">
  <tr>
    <td><em>operator</em></td>
    <td>Description</td>
  </tr>

<tr>
    <td><code>=</code> or <code>==</code></td>
    <td>proftpd version is equal</td>
  </tr>

<tr>
    <td><code>&gt;</code></td>
    <td>proftpd version is greater than</td>
  </tr>

<tr>
    <td><code>&gt;=</code></td>
    <td>proftpd version is greater or equal</td>
  </tr>

<tr>
    <td><code>&lt;</code></td>
    <td>proftpd version is less than</td>
  </tr>

<tr>
    <td><code>&lt;=</code></td>
    <td>proftpd version is less or equal</td>
  </tr>
</table>

<p>
It is also possible to use regular expressions to match the ProFTPD version.
To use a regular expression, the <em>operators</em> are:
<p>
<table border=1 summary="Regex Operators">
  <tr>
    <td><em>operator</em></td>
    <td>Description</td>
  </tr>

<tr>
    <td><code>=</code> or <code>==</code></td>
    <td><em>version</em> has the form <code>/<em>regex</em>/</code></td>
  </tr>

<tr>
    <td><code>~</code></td>
    <td><em>version</em> has the form <code><em>regex</em></code></td>
  </tr>
</table>

<p>
If you wish to reverse the meaning of the operator, prefix the <em>operator</em>
with an exclamation mark (!), <i>e.g.</i>:
<pre>
  &lt;IfVersion != 1.3.1&gt;
    # Do not use these directives if the version is 1.3.1
  &lt;/IfVersion&gt;
</pre>

<p>
If <em>operator</em> is omitted, it is assumed to be <code>=</code>.

<hr>
<h2><a name="Installation">Installation</a></h2>
The <code>mod_ifversion</code> module is distributed with ProFTPD.  For
including <code>mod_ifversion</code> as a statically linked module:
<pre>
  $ ./configure --with-modules=mod_ifversion
</pre>
To build <code>mod_ifversion</code> as a DSO module:
<pre>
  $ ./configure --enable-dso --with-shared=mod_ifversion
</pre>
Then follow the usual steps:
<pre>
  $ make
  $ make install
</pre>

<p>
For those with an existing ProFTPD installation, you can use the
<code>prxs</code> tool to add <code>mod_ifversion</code>, as a DSO module, to
your existing server:
<pre>
  $ prxs -c -i -d mod_ifversion.c
</pre>

<hr>
<h2><a name="Usage">Usage</a></h2>

<p>
The following examples demonstrate how the <code>mod_ifversion</code> can
be used.

<p>
Using a simple numeric comparison:
<pre>
  &lt;IfVersion &gt;= 1.3.1rc1&gt;
    # Only use these directives for versions greater or equal 1.3.1rc1
  &lt;/IfVersion&gt;
</pre>

<p>
Using a regular expression:
<pre>
  &lt;IfVersion = /^rc[[:digit:]]$/&gt;
    # Only use these directives for RC (release candidate) versions
  &lt;/IfVersion&gt;
</pre>

<p>
Using a reversed regular expression (<i>i.e.</i> in this case, meaning
"proftpd version does not match this pattern"):
<pre>
  &lt;IfVersion !~ ^1.3.[012]$&gt;
    # These directives are not for those versions
  &lt;/IfVersion&gt;
</pre>

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