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<th colspan="3" align="center">LPRng-HOWTO: 1 Apr 2002
(For LPRng-3.8.10)</th>
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<div class="CHAPTER">
<h1><a name="CONFIGFILE">Chapter 14. Configuration File,
Defaults and Overrides</a></h1>
<div class="TOC">
<dl>
<dt><b>Table of Contents</b></dt>
<dt>14.1. <a href="configfile.htm#AEN6731">Configuration
File Format</a></dt>
<dt>14.2. <a href="x6745.htm">Legacy
Compatibility</a></dt>
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<p>Options used:</p>
<ul>
<li>
<p><tt class="LITERAL">allow_getenv</tt> FLAG <i class=
"EMPHASIS">use GETENV environment variable</i></p>
</li>
</ul>
<br>
<br>
<p>The <b class="APPLICATION">LPRng</b> options are obtained
as follows:</p>
<ul>
<li>
<p>The compile time defaults. These are in the <tt class=
"FILENAME">LPRng/src/common/vars.c</tt> file.</p>
</li>
<li>
<p>If the <b class="APPLICATION">LPRng</b> software has
been compiled with the regression testing <span class=
"ACRONYM">GETENV</span> option enabled, the configuration
information in the file specified by the <tt class=
"LITERAL">LPD_CONF</tt> environment variable will be
used. This can only be used if you are not setuid ROOT or
as ROOT as it opens severe security loopholes.</p>
</li>
<li>
<p>The file specified by the <tt class=
"LITERAL">config_file</tt> compile time option, usually
<tt class="FILENAME">/etc/lpd.conf</tt> or <tt class=
"FILENAME">/usr/local/etc/lpd.conf</tt>, and referred to
a the <tt class="FILENAME">lpd.conf</tt> file. If the <tt
class="LITERAL">config_file</tt> option value has the
form <tt class="FILENAME">|/pathname</tt>, then <tt
class="FILENAME">/pathname</tt> must be an executable
program and will be run with the standard set of filter
options. It must write configuration option values to its
<span class="ACRONYM">STDOUT</span> and exit with a 0
status.</p>
</li>
<li>
<p>In order to protect system security, the <tt class=
"FILENAME">lpd.conf</tt> (and the <tt class=
"FILENAME">printcap</tt>) file should be read only.</p>
</li>
<li>
<p>If the <tt class="LITERAL">require_configfiles</tt>
option is set in the compile time options, then the
preceeding step must be successful, i.e. - there must be
a configuration file or the program must execute and exit
with a 0 status.</p>
</li>
<li>
<p>If a printer or spooling operation is done, then the
values in the <tt class="FILENAME">printcap</tt> entry
for the spooler are used to override the default and <tt
class="FILENAME">ifhp.conf</tt> file values.</p>
</li>
</ul>
<br>
<br>
<div class="SECT1">
<h1 class="SECT1"><a name="AEN6731">14.1. Configuration
File Format</a></h1>
<p>The configuration file format is similar to a the fields
of a printcap entry with the difference that the leading
colon is optional and there can only be one option per
line:</p>
<div class="INFORMALEXAMPLE">
<a name="AEN6734"></a>
<pre class="SCREEN">
# comment
# set option value to 1 or ON
ab
:ab
# set option value to 0 or OFF
ab@
:ab
# set option value to string
str=name
</pre>
</div>
<br>
<br>
<p>During system installation the <b class=
"APPLICATION">LPRng</b> software processes the default
values in the <tt class=
"FILENAME">LPRng/src/common/vars.c</tt> file and generates
a sample <tt class="FILENAME">lpd.conf</tt> file that has
the format:</p>
<div class="INFORMALEXAMPLE">
<a name="AEN6740"></a>
<pre class="SCREEN">
# Purpose: always print banner, ignore lpr -h option
# default ab@ (FLAG off)
# Purpose: query accounting server when connected
# default achk@ (FLAG off)
# Purpose: accounting at end (see also af, la, ar, as)
# default ae=jobend $H $n $P $k $b $t (STRING)
# Purpose: name of accounting file (see also la, ar)
# default af=acct (STRING)
# change:
# --- we change the af value to none, i.e. - no accounting
# --- file by default
af=
</pre>
</div>
<br>
<br>
<p>You can change option values by editing the file as
shown above then then to force the <b class=
"APPLICATION">lpd</b> server to use the new options, use
the <tt class="COMMAND">lpc reread</tt> command.</p>
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