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<?xml version="1.0"?>
<!DOCTYPE modulesynopsis SYSTEM "../style/modulesynopsis.dtd">
<?xml-stylesheet type="text/xsl" href="../style/manual.en.xsl"?>
<!-- $LastChangedRevision$ -->
<!--
Copyright 2002-2005 The Apache Software Foundation or its licensors,
as applicable.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<modulesynopsis metafile="mod_info.xml.meta">
<name>mod_info</name>
<description>Provides a comprehensive overview of the server
configuration</description>
<status>Extension</status>
<sourcefile>mod_info.c</sourcefile>
<identifier>info_module</identifier>
<summary>
<p>To configure <module>mod_info</module>, add the following to your
<code>httpd.conf</code> file.</p>
<example>
<Location /server-info><br />
<indent>
SetHandler server-info<br />
</indent>
</Location>
</example>
<p>Once configured, the server information is obtained by
accessing <code>http://your.host.example.com/server-info</code></p>
</summary>
<section id="security"><title>Security Issues</title>
<p>Once <module>mod_info</module> is loaded into the server, its
handler capability is available in <em>all</em> configuration
files, including per-directory files (<em>e.g.</em>,
<code>.htaccess</code>). This may have security-related
ramifications for your site.</p>
<p>In particular, this module can leak sensitive information
from the configuration directives of other Apache modules such as
system paths, usernames/passwords, database names, etc. Therefore,
this module should <strong>only</strong> be
used in a controlled environment and always with caution.</p>
<p>You will probably want to use <module>mod_authz_host</module>
to limit access to your server configuration information.</p>
<example><title>Access control</title>
<Location /server-info><br />
<indent>
SetHandler server-info<br />
Order allow,deny<br />
# Allow access from server itself<br />
Allow from 127.0.0.1<br />
# Additionally, allow access from local workstation<br />
Allow from 192.168.1.17<br />
</indent>
</Location>
</example>
</section>
<section id="queries"><title>Selecting the information shown</title>
<p>By default, the server information includes a list of
all enabled modules, and for each module, a description of
the directives understood by that module, the hooks implemented
by that module, and the relevant directives from the current
configuration.</p>
<p>Other views of the configuration information are available by
appending a query to the <code>server-info</code> request. For
example, <code>http://your.host.example.com/server-info?config</code>
will show all configuration directives.</p>
<dl>
<dt><code>?<module-name></code></dt>
<dd>Only information relevant to the named module</dd>
<dt><code>?config</code></dt>
<dd>Just the configuration directives, not sorted by module</dd>
<dt><code>?hooks</code></dt>
<dd>Only the list of Hooks each module is attached to</dd>
<dt><code>?list</code></dt>
<dd>Only a simple list of enabled modules</dd>
<dt><code>?server</code></dt>
<dd>Only the basic server information</dd>
</dl>
</section>
<section id="limitations"><title>Known Limitations</title>
<p><module>mod_info</module> provides its information by reading the
parsed configuration, rather than reading the original configuration
file. There are a few limitations as a result of the way the parsed
configuration tree is created:</p>
<ul>
<li>Directives which are executed immediately rather than being
stored in the parsed configuration are not listed. These include
<directive module="core">ServerRoot</directive>,
<directive module="mod_so">LoadModule</directive>, and
<directive module="mod_so">LoadFile</directive>.</li>
<li>Directives which control the configuration file itself, such as
<directive module="core">Include</directive>,
<directive module="core"><IfModule></directive> and
<directive module="core"><IfDefine></directive> are not
listed, but the included configuration directives are.</li>
<li>Comments are not listed. (This may be considered a feature.)</li>
<li>Configuration directives from <code>.htaccess</code> files are
not listed (since they do not form part of the permanent server
configuration).</li>
<li>Container directives such as
<directive module="core"><Directory></directive>
are listed normally, but <module>mod_info</module> cannot figure
out the line number for the closing
<directive module="core"></Directory></directive>.</li>
<li>Directives generated by third party modules such as <module>mod_perl</module>
might not be listed.</li>
</ul>
</section>
<directivesynopsis>
<name>AddModuleInfo</name>
<description>Adds additional information to the module
information displayed by the server-info handler</description>
<syntax>AddModuleInfo <var>module-name</var> <var>string</var></syntax>
<contextlist><context>server config</context><context>virtual host</context>
</contextlist>
<compatibility>Apache 1.3 and above</compatibility>
<usage>
<p>This allows the content of <var>string</var> to be shown as
HTML interpreted, <strong>Additional Information</strong> for
the module <var>module-name</var>. Example:</p>
<example>
AddModuleInfo mod_deflate.c 'See <a \<br />
<indent>
href="http://www.apache.org/docs-2.1/mod/mod_deflate.html">\<br />
http://www.apache.org/docs-2.1/mod/mod_deflate.html</a>'
</indent>
</example>
</usage>
</directivesynopsis>
</modulesynopsis>
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