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<th colspan="3" align="center">LPRng-HOWTO: 1 Apr 2002
(For LPRng-3.8.10)</th>
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<td width="80%" align="center" valign="bottom">Chapter
17. Permissions and Authentication</td>
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<div class="SECT1">
<h1 class="SECT1"><a name="PERMSPATH">17.3. Permission File
Location</a></h1>
<p>Options used:</p>
<ul>
<li>
<p><tt class="LITERAL">perms_path=</tt> <i class=
"EMPHASIS">path</i></p>
</li>
</ul>
<br>
<br>
<p>The <tt class="LITERAL">perms_path=</tt> configuration
variable specifies the location of the default permissions
file. The default value is:</p>
<div class="INFORMALEXAMPLE">
<a name="AEN8778"></a>
<pre class="SCREEN">
perms_path=${sysconfdir}/lpd.perms
</pre>
</div>
<br>
<br>
<p>The <tt class="FILENAME">lpd.perms</tt> file can be
obtained by running a program, in a similar manner to the <tt
class="FILENAME">printcap</tt> file. See <a href=
"filters.htm">Filters</a> for details on how the program
would be invoked. For example, assume the configuration
information specified:</p>
<div class="INFORMALEXAMPLE">
<a name="AEN8784"></a>
<pre class="SCREEN">
perms_path=|/usr/local/libexec/get_perms
</pre>
</div>
<br>
<br>
<p>The <b class="APPLICATION">lpd</b> server will write
either a blank line for connection (<tt class=
"LITERAL">SERVICE=X</tt>) and global <b class=
"APPLICATION">lpc</b> permissions (<tt class=
"LITERAL">SERVICE=C</tt> and <tt class=
"LITERAL">LPC=reread,lpd,default</tt>) or the name of the
spool queue to the <tt class="LITERAL">get_perms</tt> <span
class="ACRONYM">STDIN</span>, and expects to read permission
information from its <span class="ACRONYM">STDOUT</span>. If
the filter method is used, it should always return the
complete set of connection (<tt class="LITERAL">X</tt>) and
control (<tt class="LITERAL">C</tt> service values.</p>
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