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<!DOCTYPE html> <html> <head> <title>ProFTPD module mod_ifversion</title> </head> <body bgcolor=white> <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><IfVersion></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 <tj <i>at</i> castaglia.org> with any questions, concerns, or suggestions regarding this module. <h2>Directives</h2> <ul> <li><a href="#IfVersion"><IfVersion></a> </ul> <hr> <h3><a name="IfVersion"><IfVersion></a></h3> <strong>Syntax:</strong> <IfVersion <em>[[!]operator] version</em>><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><IfVersion></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>></code></td> <td>proftpd version is greater than</td> </tr> <tr> <td><code>>=</code></td> <td>proftpd version is greater or equal</td> </tr> <tr> <td><code><</code></td> <td>proftpd version is less than</td> </tr> <tr> <td><code><=</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> <IfVersion != 1.3.1> # Do not use these directives if the version is 1.3.1 </IfVersion> </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> <IfVersion >= 1.3.1rc1> # Only use these directives for versions greater or equal 1.3.1rc1 </IfVersion> </pre> <p> Using a regular expression: <pre> <IfVersion = /^rc[[:digit:]]$/> # Only use these directives for RC (release candidate) versions </IfVersion> </pre> <p> Using a reversed regular expression (<i>i.e.</i> in this case, meaning "proftpd version does not match this pattern"): <pre> <IfVersion !~ ^1.3.[012]$> # These directives are not for those versions </IfVersion> </pre> <p> <hr> <font size=2><b><i> © Copyright 2009-2017 TJ Saunders<br> All Rights Reserved<br> </i></b></font> <hr> </body> </html>