<chapter id="cups-configuration">
<title>Print Server Configuration: CUPS</title>

<para>Start the print server configuration (now that you have chosen
&CUPS;, this is equivalent to the configuration of the &CUPS; daemon) by
clicking on the appropriate button. You can find it by moving the mouse
slowly over the buttons and reading the tooltips. It should be the 11th
from the left , or third from the right; its icon is a
<guiicon>wrench</guiicon>.</para>

<para>The &CUPS; Server Configuration window pops up. It gives you a
structured view of all the settings that apply to the &CUPS; daemon. The
configuration file for that daemon is normally located in
<filename>/etc/cups/cupsd.conf</filename>. This is a plain
<acronym>ASCII</acronym> file with a syntax similar to the configuration
file of the <application>Apache</application> web server. It is a good
idea to create a backup copy, just in case something goes wrong with the
configuration through &tdeprint;/&CUPS; Server Configuration
dialogs:</para>

<screen><userinput><command>cp</command> <filename>/etc/cups/cupsd.conf</filename> <filename>/etc/cups/cupsd.conf.bak</filename></userinput></screen>

<para>As this graphical user interface to edit the configuration file is
such a new feature, you should have the second chance of resorting to
the original file. So back it up, please.</para>

<sect1 id="quick-help">
<title>Quick Help</title>

<para>One very nice feature is the <quote>Quick Help</quote>
available. If you click on the little question mark (<guiicon>What's
this?</guiicon>) on your window title bar, you'll see the cursor
changing its form.  Now click on a <command>cupsd</command>
configuration setting field to find out what it means and what your
options are. In most cases you should understand the meaning
immediately, otherwise turn to the excellent &CUPS; documentation. (If
your &CUPS; Daemon is running, you have it online on your own host at
<ulink
url="http://localhost:631/documentation.html">http://localhost:631/documentation.html</ulink>.</para>
<para>If &CUPS; is not running, but installed on your system you could
find it in your own host's file system.  The exact location depends on
your &OS;, but on &Linux; the default is <filename
class="directory">/usr/share/doc/cups/</filename> or
<filename class="directory">
/usr/share/doc/cups/documentation.html</filename>.</para>

</sect1>
<sect1 id="longer-help">
<title>Longer Help</title>

<para>For the best, most detailed and most recent information you should
always refer to the original &CUPS; documentation.  &CUPS; is, much like
&tde; in a rapid development process.  There are constantly new features
being added. New features might for times be only configurable by
directly editing the configuration files. The &tdeprint; &GUI; might not
have caught up with &CUPS; development.</para>

<para>Just in case you want to look at the original configuration files
of your &CUPS; system  -- mdash; they are here:</para>

<note>
<para>These paths are based on the default installation.  Your &OS;
may have installed them to a different prefix, for example, <filename
class="directory">/usr/local/</filename>, but the hierarchy should
still match that shown below.</para>
</note>

<variablelist>
<varlistentry>
<term><filename class="directory">/etc/cups/</filename></term>
<listitem>
<para>The folder with the configuration files</para>
</listitem>
</varlistentry>

<varlistentry>
<term><filename>/etc/cups/cupsd.conf</filename></term>
<listitem>
<para>The configuration file for the &CUPS; daemon</para>
</listitem>
</varlistentry>

<varlistentry>
<term><filename>/etc/cups/printers.conf</filename></term>
<listitem>
<para>The configuration file that contains the information about your
locally installed printers.</para>
</listitem>
</varlistentry>

<varlistentry>
<term><filename class="directory">/etc/cups/ppd/</filename></term>
<listitem>
<para>The folder with &PPD; files of your installed
printers.</para>
</listitem>
</varlistentry>
</variablelist>

<para>The following links only work if your &CUPS; daemon is up and
running.  To access all the original &CUPS; documentation, go
to:</para>

<variablelist>
<varlistentry>
<term><ulink url="http://localhost:631/documentation.html">
http://localhost:631/documentation.html</ulink></term>
<listitem>
<para>A page with all the links to the other documents.</para>
</listitem>
</varlistentry>

<varlistentry>
<term><ulink url="http://localhost:631/sam.html">
http://localhost:631/sam.html</ulink></term>
<listitem>
<para>Direct access to the &CUPS; Software Administrator Manual
in <acronym>HTML</acronym> format.</para>
</listitem>
</varlistentry>

<varlistentry>
<term><ulink url="http://localhost:631/sam.pdf">
http://localhost:631/sam.pdf</ulink></term>
<listitem>
<para>Direct access to the &CUPS; Software Administrator Manual in
<acronym>PDF</acronym> format.</para>
</listitem>
</varlistentry>

<varlistentry>
<term><ulink url="http://www.cups.org/documentation.html">
http://www.cups.org/documentation.html</ulink></term>
<listitem>
<para>The latest on line documentation from the &CUPS; web
site.</para>
</listitem>
</varlistentry>
</variablelist>
<para>The following links give you access to the same files (probably
icons and graphics will be missing) even if your CUPS daemon is not up
and running. You need, however, CUPS installed on your system. (Some
distributions might place the files somewhere else  -- mdash; you're on your
own then to find out where...) To access all the original CUPS
documentation, go to:</para>

<para>This documentation is available even when the &CUPS; daemon is
not installed, although you may find images and icons are missing when
you view the <acronym>HTML</acronym> files.</para>

<para>As noted above, the hierarchy below should be intact, but your
&OS; may have installed &CUPS; to a different location.</para>

<variablelist>
<varlistentry>
<term><filename>/usr/share/doc/cups/documentation.html</filename></term>
<listitem>
<para>A page with all the links to the other documents.</para>
</listitem>
</varlistentry>

<varlistentry>
<term><filename>/usr/share/doc/cups/sam.html</filename></term>
<listitem>
<para>Direct access to the &CUPS; Software Administrator Manual in
<acronym>HTML</acronym> format.</para>
</listitem>
</varlistentry>

<varlistentry>
<term><filename>/usr/share/doc/cups/sam.pdf</filename></term>
<listitem>
<para>Direct access to the &CUPS; Software Administrator Manual in
<acronym>PDF</acronym> format.</para>
</listitem>
</varlistentry>
</variablelist>

<para>There are a few WebSites and Newsgroups discussing &CUPS; (and
&Linux; Printing in General) and giving help to newbies at:</para>

<variablelist>
<varlistentry>
<term><ulink url="http://www.cups.org/newsgroups.php">
http://www.cups.org/newsgroups.php</ulink></term>
<listitem>
<para>The &CUPS; website.</para>
</listitem>
</varlistentry>

<varlistentry>
<term><ulink url="http://www.linuxprinting.org/newsportal/">
http://www.linuxprinting.org/newsportal/</ulink></term>
<listitem>
<para>LinuxPrinting.org, the home of the Linuxprinting HOWTO and the
&Linux; Printer Database</para>
</listitem>
</varlistentry>
</variablelist>

<para>And finally, there will be a WebSite for &tdeprint; and related
documentation, at <ulink url="http://tdeprint.sourceforge.net/">
http://tdeprint.sourceforge.net/</ulink></para>

<para>In the next section I will step you through most of the
configuration options of &tdeprint; with &CUPS;.</para>

</sect1>
<sect1 id="explaining-different-gui-elements">
<title>Explaining different elements of the &GUI;</title>

<sect2>
<title>Upper Window: View on Printers, both Real and Virtual</title>

<para>This section is not yet complete</para>

<itemizedlist>
<listitem>
<para>Tree view, icon view and list view</para>
</listitem>
<listitem>
<para>The icons of the task bar</para>
</listitem>
<listitem>
<para>Different fonts for different printers</para>
</listitem>
<listitem>
<para>Different printer icons mean different things</para>
</listitem>
</itemizedlist>

</sect2>

<sect2>
<title>Lower Window: Tabbed View of Details</title>

<para>This section is not yet complete.</para>

<itemizedlist>
<listitem>
<para>The icons of the task bar</para>
</listitem>
<listitem>
<para>The Tabs</para>
</listitem>
<listitem>
<para>Changing printer settings</para>
</listitem>
</itemizedlist>

</sect2>

</sect1>


<sect1 id="welcome-to-cups-server-configuration">
<title>Welcome to the &CUPS; Server Configuration</title>

<para>This is the Welcome Screen for your server configuration
dialogs. Clicking onto one of the items of the tree view on left
side of the screen opens the appropriate part of the configuration
settings.</para>

<para>Every setting has a default value. The defaults let &CUPS;
normally work as a fully functional client. The clients listen on
TCP/IP Port 631 for infos broadcast by &CUPS; servers on the
<acronym>LAN</acronym>. This information let the clients print
immediately after receiving them, without installing any driver or
configuring any printer on the clients.</para>

<para>To configure a &CUPS; server (which is broadcasting its service
to the <acronym>LAN</acronym>) you need to change settings from the
defaults.</para>

<para>The dialog to configure the &CUPS; server: welcome screen.</para>
<screenshot>
<screeninfo>CUPS server configuration dialog: welcome screen</screeninfo>
<mediaobject>
<imageobject>
<imagedata fileref="cupsserverconfiguration1_welcome.png"
format="PNG"/></imageobject>
<textobject>
<phrase>The dialog to configure the &CUPS; server: welcome
screen</phrase></textobject>
<caption><para>The dialog to configure the &CUPS; server: welcome
screen</para></caption>
</mediaobject>
</screenshot>

<para>To select the default setting of any item just enable the
checkbox on the right side of the screen. To set an item to a
different value, disable the checkbox and then go on to do the setting
you want on the left side of the screen.</para>

<para>The complete server configuration includes:</para>

<itemizedlist>
<listitem>
<para><link linkend="server-general-configuration"><guilabel>Server</guilabel>
General Configuration</link></para>
</listitem>
<listitem>
<para><link linkend="server-logging-configuration">Server
<guilabel>Log</guilabel>ging Configuration</link></para>
</listitem>
<listitem>
<para><link
linkend="server-directories-configuration">Server
<guilabel>Folders</guilabel> and Path Definitions</link></para>
</listitem>
<listitem>
<para><link linkend="server-configuration">Server
<guilabel>HTTP</guilabel> Configuration</link></para>
</listitem>
<listitem>
<para><link linkend="server-encryption-support-configuration">Server
<guilabel>Encryption</guilabel> and Certificate Support
Configuration</link></para>
</listitem>
<listitem>
<para><link linkend="server-miscellaneous-configuration">Server
<guilabel>Misc</guilabel>ellaneous Configuration</link></para>
</listitem>
<listitem>
<para><guilabel>Network</guilabel> General Configuration</para>
</listitem>
<listitem>
<para><link linkend="network-clients-configuration">Network
<guilabel>Clients</guilabel> Configuration</link></para>
</listitem>
<listitem>
<para><link
linkend="browsing-general-configuration"><guilabel>Browsing</guilabel>
General Configuration</link></para>
</listitem>
<listitem>
<para><link linkend="browsing-connection-configuration">Browsing
<guilabel>Connection</guilabel> Configuration</link></para>
</listitem>
<listitem>
<para><link
linkend="browsing-masks-configuration">Browsing
<guilabel>Masks</guilabel> Configuration</link></para>
</listitem>
<listitem>
<para><link linkend="browsing-timeouts-configuration">Browsing
<guilabel>Timeouts</guilabel> Configuration</link></para>
</listitem>
<listitem>
<para><link linkend="browsing-relay-configuration">Browsing
<guilabel>Relay</guilabel> Configuration</link></para>
</listitem>
<listitem>
<para><link
linkend="security-configuration"><guilabel>Security</guilabel>
Configuration</link></para>
</listitem>
</itemizedlist>

<para>Each of these configuration items will be described in the
following sections of the manual.</para>

</sect1>

<sect1 id="server-general-configuration">
<title>Server General Configuration</title>

<para>The server general configuration is done on this screen. It
includes:</para>

<itemizedlist>
<listitem><para><guilabel>Server name</guilabel></para></listitem>
<listitem><para><guilabel>Administrators email</guilabel></para></listitem>
<listitem><para><guilabel>Server user</guilabel></para></listitem>
<listitem><para><guilabel>Server group</guilabel></para></listitem>
<listitem><para><guilabel>Remote user name</guilabel></para></listitem>
</itemizedlist>

<para>The tab window to configure the &CUPS; server general settings
lets you the change the default values. Click on the little question
mark and then on one of the fields to get a <quote>Quick Help</quote>
about the meaning of the setting.</para>

<para>If you are unsure, leave alone and turn to the original &CUPS;
documentation first.  If your &CUPS; daemon is already running, it is
readable from the &konqueror; by pointing it to &URL; <ulink
url="http://localhost:631/documentation.html">
http://localhost:631/documentation.html</ulink>.</para>

<para>There, first <quote>make friends</quote> with the Software
Administrator Manual. Otherwise, for example, if the &CUPS; daemon is
not running, try looking in your local file system, by default at
<filename class="directory">/usr/share/doc/cups/</filename> or
<filename>/usr/share/doc/cups/documentation.html</filename>.</para>

<screenshot>
<screeninfo>&CUPS; server general configuration dialog: ServerName, AdminMail,
ServerUser, ServerGroup, RemoteUserName</screeninfo>
<mediaobject>
<imageobject>
<imagedata fileref="cupsserverconfiguration2_general.png"
format="PNG"/></imageobject>
<textobject>
<phrase>The dialog to configure the &CUPS; server general settings:
ServerName, AdminMail, ServerUser, ServerGroup, RemoteUserName
</phrase></textobject>
</mediaobject>
</screenshot>

<variablelist>
<varlistentry>
<term><guilabel>Server Name</guilabel></term>
<listitem>
<para>The hostname of your server, as advertised to the world. By
default, &CUPS; will use the hostname of the system.  To set the
default server usd by clients, see the
<filename>client.conf</filename> file.</para>

<informalexample>
<para>For example, enter <userinput>myhost.domain.com</userinput></para>
</informalexample>

<para>This is the hostname that is reported to clients. Should you
ever encounter strange problems in accessing the server, put here its
<acronym>IP</acronym> address for troubleshooting. This way you
eliminate any potential name resolution problems; and you can more
easily nail the real problem down.</para>
</listitem>
</varlistentry>

<varlistentry>
<term><guilabel>Administrators email</guilabel></term>
<listitem>
<para>This is the email address to send all complaints or problems
to.  By default &CUPS; will use <quote>root@hostname</quote>.</para>

<informalexample>
<para>For example, enter
<userinput>root@myhost.com</userinput>.</para>
</informalexample>

<note>
<para>Contrary to what the quickhelp suggests, it is also legal to
send an email full of praise and enthusiasm about &CUPS; and
&tdeprint; to the server administrator.</para>
</note>
</listitem>
</varlistentry>

<varlistentry>
<term><guilabel>Server User</guilabel></term>
<listitem>
<para>The user the server runs under.  Normally this must be
<systemitem class="username">lp</systemitem>, however you can
configure things for another user if needed.</para>

<note>
<para>The server must be initially run as root to support the default
<acronym>IPP</acronym> port of 631.  It changes users whenever an
external program is run.</para>
</note>

<informalexample>
<para>Enter for example <userinput>lp</userinput>.</para>
</informalexample>

<para>This is the &UNIX; user account for filters and
<acronym>CGI</acronym> programs to run under. <acronym>CGI</acronym>
programs are responsible for showing you the nice web administration
interface accessible via <ulink
url="http://localhost:631/">http://localhost:631/</ulink>).</para>

<warning>
<para>There is no need to set the <guilabel>User</guilabel> directive
to <systemitem class="username">root</systemitem>, so never do this,
as it only involves dangers. Should anyone discover security
vulnerabilities in one of the used file filters, printer drivers or
<acronym>CGI</acronym> programs, they could remotely execute arbitrary
commands on your system with root user privileges. Always use an
unprivileged account for the server directive
<guilabel>User</guilabel>.</para>
</warning>
</listitem>
</varlistentry>

<varlistentry>
<term><guilabel>Server group</guilabel></term>
<listitem>
<para>The group the server runs under.  Normally this must be
<systemitem class="groupname">lpadmin</systemitem>, however you can
configure things for another group as needed.</para>

<informalexample>
<para>Enter for example <userinput>lpadmin</userinput>.</para>
</informalexample>
</listitem>
</varlistentry>

<varlistentry>
<term><guilabel>Remote user name</guilabel></term>
<listitem>
<para>The name of the user assigned to unauthenticated accesses from
remote systems.  By default <userinput>remroot</userinput>.</para>

<para>This name will appear in log files and in queries about the job
owner &etc;, for all resources and locations of the &CUPS; server that
are configured to allow access <emphasis>without</emphasis>
authentication.  Authenticated entries will carry the authenticated
names.</para>
</listitem>
</varlistentry>
</variablelist>
</sect1>

<sect1 id="server-logging-configuration">
<title>Server Logging Configuration</title>

<para>The server logging configuration is done on this screen. It
includes:</para>

<itemizedlist>
<listitem><para><guilabel>Access log file</guilabel> setting</para></listitem>
<listitem><para><guilabel>Error log file</guilabel> setting</para></listitem>
<listitem><para><guilabel>Page log</guilabel> file setting</para></listitem>
<listitem><para><guilabel>Log level</guilabel> setting</para></listitem>
<listitem><para><guilabel>Max log file size</guilabel>
setting</para></listitem>
</itemizedlist>

<para>This is an important screen for you. Should you ever encounter
problems: here is the place to set the Log level to
<quote>debug</quote>, restart the &CUPS; daemon and then look at the
Error log file defined here for entries that might give you an insight
to the trouble.</para>

<screenshot>
<screeninfo>&CUPS; server configuration dialog: <guilabel>Server
logging</guilabel>  </screeninfo>
<mediaobject>
<imageobject>
<imagedata fileref="cupsserverconfiguration3_logging.png"
format="PNG"/></imageobject>
<textobject>
<phrase>The dialog to configure the &CUPS; server: <guilabel>Server
logging</guilabel></phrase></textobject>
</mediaobject>
</screenshot>

<variablelist>
<varlistentry>
<term><guilabel>Access log file</guilabel></term>
<listitem>
<para>This is where accesses to the server are logged.  If this does
not start with a leading <literal>/</literal>, then it is assumed to
be relative to the server root.</para>

<para>You can also use the special name <userinput>syslog</userinput>
to send the output to the syslog file or daemon.</para>

<informalexample>
<para>Enter a path, for example
<userinput><filename>/var/log/cups/acces_log</filename></userinput>.</para>
</informalexample>

<para>The format of this file is stored in the so-called <quote>Common
Log Format</quote>. This way you can use programs such as
<application>Webalyzer</application> or any other Web access reporting
tool to generate reports on the &CUPS; server activities.</para>

<para>To include the server name in the file name use a
<token>%s</token> in the name. Example:
<userinput><filename>/var/log/cups/access_log-%s</filename></userinput>.</para>

<screen><prompt>kurt@transmeta:~ ></prompt><userinput><command>tail</command> <parameter>/var/log/cups/access_log</parameter></userinput>
<computeroutput>
127.0.0.1    - - [04/Aug/2001:20:11:39 +0100] "POST /printers/ HTTP/1.1" 200 109
127.0.0.1    - - [04/Aug/2001:20:11:39 +0100] "POST /admin/ HTTP/1.1" 401 0
127.0.0.1    - - [04/Aug/2001:20:11:39 +0100] "POST / HTTP/1.1" 200 210
127.0.0.1    - - [04/Aug/2001:20:11:39 +0100] "GET /ppd/DANKA_P450.ppd HTTP/1.1" 200 51021
127.0.0.1    - - [04/Aug/2001:20:11:39 +0100] "POST /jobs/ HTTP/1.1" 200 246
10.160.16.45 - - [04/Aug/2001:20:11:39 +0100] "GET /printers/DANKA_P450 HTTP/1.0" 200 0
127.0.0.1    - - [04/Aug/2001:20:11:39 +0100] "POST / HTTP/1.1" 200 80
127.0.0.1    - - [04/Aug/2001:20:11:39 +0100] "POST / HTTP/1.1" 200 139
10.160.16.45 - - [04/Aug/2001:20:11:40 +0100] "GET /cups.css HTTP/1.0" 200 198
127.0.0.1    - - [04/Aug/2001:20:11:40 +0100] "POST / HTTP/1.1" 200 139
10.160.16.45 - - [04/Aug/2001:20:11:39 +0100] "GET /printers/DANKA_P450 HTTP/1.0" 200 7319
10.160.16.45 - - [04/Aug/2001:20:11:40 +0100] "GET /images/title-logo.gif HTTP/1.0" 200 5729
</computeroutput></screen>

<para>You see a separate line for each single access, showing the
<acronym>IP</acronym> address of the accessing client, date and time
of access, method of access (<command>POST</command> or
<command>GET</command>), the requested ressource, the &HTTP; version
used by the client, status code and the number of transferred
bytes. Status code <errorcode>200</errorcode> means
<errorname>successful-OK</errorname> the <errorcode>401</errorcode> in
the above example was an <errorname>unauthorized access</errorname>
which was denied. For a detailed explanation of the log format go to
<ulink url="http://localhost:631/sam.html#7_6_1">the &CUPS; Software
Administrator Manual</ulink>.</para>
</listitem>
</varlistentry>

<varlistentry>
<term><guilabel>Error log file</guilabel></term>
<listitem>
<para>If this does not start with a leading <literal>/</literal>, then
it is assumed to be relative to the server root.  The default setting
is <filename>/var/log/cups/error_log</filename>.</para>

<para>You can also use the special name <userinput>syslog</userinput>
to send the output to the syslog file or daemon.</para>

<informalexample>
<para>Enter the path, for example
<userinput><filename>/var/log/cups/error_log</filename></userinput>.</para>
</informalexample>

<para>The error log excerpt below shows you the part logged for printing the test page
with the default setting of <guilabel>Log level</guilabel> to
<quote>info</quote>.  For an explanation of the <guilabel>Log
Level</guilabel> setting see further below.</para>

<screen><prompt>kurt@transmeta:~ ></prompt><userinput><command> tail </command> <parameter>/var/log/cups/error_log</parameter></userinput>
<computeroutput>
I [04/Aug/2001:23:15:10 +0100] Job 213 queued on 'DANKA_P450' by 'root'
I [04/Aug/2001:23:15:10 +0100] Started filter /usr/lib/cups/filter/pstops (PID 18891) for job 213.
I [04/Aug/2001:23:15:10 +0100] Started backend /usr/lib/cups/backend/lpd (PID 18892) for job 213.
</computeroutput></screen>
</listitem>
</varlistentry>

<varlistentry>
<term><guilabel>Page log file</guilabel></term>
<listitem>
<para>If this does not start with a leading <literal>/</literal> then
it is assumed to be relative to the server root.  The default is
<filename>/var/log/cups/page_log</filename></para>

<para>You can also use the special name <userinput>syslog</userinput>
to send the output to the syslog file or daemon.</para>

<informalexample>
<para>Enter the path, for example
<userinput><filename>/var/log/cups/page_log</filename></userinput>.</para>
</informalexample>
<para>The page log file has a line for every single page of every job
printed.</para>

<para> Here is what some entries look like:</para>

<screen><prompt>kurt@transmeta:~ ></prompt><userinput><command> tail </command> <parameter>/var/log/cups/page_log</parameter></userinput>
<computeroutput>
GIMP_print_stp_HP kdetest 201 [03/Aug/2001:03:18:03 +0100] 4 1
GIMP_print_stp_HP kdetest 201 [03/Aug/2001:03:18:03 +0100] 5 1
GIMP_print_stp_HP kdetest 202 [03/Aug/2001:11:46:49 +0100] 1 1
GIMP_print_stp_HP kdetest 203 [03/Aug/2001:11:46:54 +0100] 1 1
DANKA_infotec_P450 kurt 204 [04/Aug/2001:03:29:00 +0100] 1 33
DANKA_infotec_P450 kurt 204 [04/Aug/2001:03:29:00 +0100] 2 33
DANKA_infotec_P450 kurt 204 [04/Aug/2001:03:29:00 +0100] 3 33
DANKA_infotec_P450 kurt 204 [04/Aug/2001:03:29:00 +0100] 4 33
DANKA_infotec_P450 root 205 [04/Aug/2001:19:12:34 +0100] 1 14
DANKA_infotec_P450 root 206 [04/Aug/2001:19:15:20 +0100] 1 1
</computeroutput></screen>

<para>In this excerpt of the file you find information on the name of
the printers (<systemitem
class="resource">GIMP_print_stp_HP</systemitem> and <systemitem
class="resource">DANKA_infotec_P450</systemitem>) used through this
server, the user names (<systemitem
class="username">kdetest</systemitem>, <systemitem
class="username">kurt</systemitem> and <systemitem
class="username">root</systemitem>), the job-IDs (<quote>201</quote>
to <quote>205</quote>), time of printing, page number inside the job
and the number of copies for the pages.  For example, job-ID 204 had 4
pages and 33 copies printed, job-ID 205 had 14 copies of just 1 page)
.</para>

<note>
<para>&CUPS; is dependent (for its calculation of the number of pages
in a job) on passing the &PostScript; through the
<quote>pstops</quote> filter.  See the <link
linkend="architecture-diagram">&kivio; Flowchart</link> on the &CUPS;
filter architecture for an idea about were this filter fits into the
whole printing process).  More, <command>pstops</command> depends for
the counting on a <acronym>DSC</acronym> conforming
(<acronym>DSC</acronym> is Document Structuring Conventions, a
standard defined by Adobe) to be sent by the client.  In most cases
this is working.</para>

<para>However, this page accounting does not work for any
<quote>raw</quote> printer queues (as those, by definition, don't use
any filtering on the &CUPS; host and are by-passing
<command>pstops</command>.) Every job going through a
<quote>raw</quote> queue is counted as a 1-page-job (with possibly
multiple copies). This is especially true for all Jobs send from
&Microsoft; &Windows; clients via <application>Samba</application> to
the &CUPS; server, as those jobs are already arriving in the correct
format for the printer, because the clients use the original printer
driver.</para>
</note>

<note>
<para>I am still looking for someone who will write a nice &CUPS; page
log analysing tool. It should generate a report with a graphical
output similar to the <application>Webalizer</application>'s access
log reports. This way you could have nice statistics to be used for
accounting about usage of printers, load dependent on daytime or
weekday, users &etc; Anyone?</para>
</note>
</listitem>
</varlistentry>

<varlistentry>
<term><guilabel>Log level</guilabel></term>
<listitem>
<para>This setting controls the number of messages logged to the error
log file.  It can be one of the following:</para>

<variablelist>
<varlistentry>
<term>debug2</term>
<listitem>
<para>Log everything.</para>
</listitem>
</varlistentry>

<varlistentry>
<term>debug</term>
<listitem>
<para>Log almost everything.</para>
</listitem>
</varlistentry>

<varlistentry>
<term>info</term>
<listitem>
<para>Log all requests and state changes.</para>
</listitem>
</varlistentry>

<varlistentry>
<term>warn</term>
<listitem>
<para>Log errors and warnings.</para>
</listitem>
</varlistentry>

<varlistentry>
<term>error</term>
<listitem>
<para>Log only errors.</para>
</listitem>
</varlistentry>

<varlistentry>
<term>none</term>
<listitem>
<para>Log nothing.</para>
</listitem>
</varlistentry>

</variablelist>

<para>If you need to troubleshoot (or if you want to study the inner
workings of &CUPS;), set the log level to debug or debug2. Then the
error_log will have a lot more entries (not just errors, but also
informational entries).</para> 

<para>You can use this to watch <quote>live</quote> what &CUPS; is
doing when you send a print job. In a &konsole; type:</para>

<screen><prompt>kurt@transmeta:~ ></prompt><userinput><command>tail</command> <option>-f</option> <option>-n</option><parameter>100</parameter> <parameter>/var/log/cups/error_log</parameter></userinput></screen>

<para>This will give you the last 100 lines (<option>-n</option>
<parameter>100</parameter>) of the file onto the screen and a
<quote>realtime</quote> update (<option>-f</option>)of what is
happening. The following listing shows the printing of a test page
(some pieces have been cut off for space reasons... Try it yourself if
you need more info):</para>

<screen><computeroutput> 
I [04/Aug/2001:23:15:12 +0100] Job 214 queued on 'DANKA_P450' by 'root'
D [04/Aug/2001:23:15:12 +0100] StartJob(214, 08426fe0) 
D [04/Aug/2001:23:15:12 +0100] StartJob() id = 214, file = 0/1 
D [04/Aug/2001:23:15:12 +0100] job-sheets=none,none 
D [04/Aug/2001:23:15:12 +0100] banner_page = 0 
D [04/Aug/2001:23:15:12 +0100] StartJob: argv = "DANKA_P450","214","root","TDE Print Test",
[....]  
D [04/Aug/2001:23:15:12 +0100] StartJob: envp = "PATH=/usr/lib/cups/filter:/bin:/usr/bin", [....]  
D [04/Aug/2001:23:15:12 +0100] StartJob: statusfds = 5, 6 
D [04/Aug/2001:23:15:12 +0100] StartJob: filterfds[1] = 7, -1 
D [04/Aug/2001:23:15:12 +0100] StartJob: filter = "/usr/lib/cups/filter/pstops" 
D [04/Aug/2001:23:15:12 +0100] StartJob: filterfds[0] = 8, 9 
D [04/Aug/2001:23:15:12 +0100] start_process("/usr/lib/cups/filter/pstops", [....]  
I [04/Aug/2001:23:15:12 +0100] Started filter /usr/lib/cups/filter/pstops (PID 18991) for job 214.  
D [04/Aug/2001:23:15:12 +0100] StartJob: backend = "/usr/lib/cups/backend/lpd" 
D [04/Aug/2001:23:15:12 +0100] StartJob: filterfds[1] = -1, 7 
D [04/Aug/2001:23:15:12 +0100] start_process("/usr/lib/cups/backend/lpd", [....]  
I [04/Aug/2001:23:15:12 +0100] Started backend /usr/lib/cups/backend/lpd (PID 18992) for job 214.
D [04/Aug/2001:23:15:12 +0100] Page = 595x842; 15,16 to 580,833 [....]  </computeroutput></screen> 

<para>The lines tagged <quote>D</quote> at the beginning are debug
level entries, the ones tagged <quote>I</quote> are there in
<quote>info</quote> level.</para>
</listitem>
</varlistentry>

<varlistentry>
<term><guilabel>Max log file size</guilabel></term>
<listitem>

<para>Controls the maximum size of each log file before they are
rotated.  Defaults to 1048576 (1 Mb).  Set this to 0 to disable log
rotation.</para>

<informalexample>
<para>Enter an size in bytes, for example <userinput>1048576</userinput></para>
</informalexample>

</listitem>
</varlistentry>
</variablelist>
</sect1>

<sect1 id="server-directories-configuration">
<title>Server Folders Configuration</title>

<para>The dialog to configure the &CUPS; server.  Different
folders are to be set here. Normally you don't need to change
anything in this section. In case you play around with fancy
(TrueType, &PostScript; or other) fonts on your system, this qis the
place to do the settings for using those fonts when printing.  Server
folder settings include:</para>

<itemizedlist>
<listitem>
<para><guilabel>Executables</guilabel>: where to find the server
executables</para>
</listitem>
<listitem>
<para><guilabel>Configuration</guilabel>: where to find the server
configuration files</para>
</listitem>
<listitem>
<para><guilabel>Data</guilabel>: where to find the server data
files</para>
</listitem>
<listitem>
<para><guilabel>Temporary files</guilabel>: where to put the server
temporary print files </para>
</listitem>
<listitem>
<para><guilabel>Temporary Requests</guilabel>: where to find the
server </para>
</listitem>
<listitem>
<para><guilabel>Font Path</guilabel>: where to find the
server fonts</para>
</listitem>
</itemizedlist>
<screenshot>
<screeninfo>&CUPS; server configuration dialog: &HTTP; configuration</screeninfo>
<mediaobject>
<imageobject>
<imagedata fileref="cupsserverconfiguration4_directories.png"
format="PNG"/></imageobject>
<textobject>
<phrase>The dialog to configure the &CUPS; server: &HTTP; configuration</phrase></textobject>
</mediaobject>
</screenshot>

<variablelist>
<varlistentry>
<term><guilabel>Executables</guilabel></term>
<listitem>
<para>The root folder for the scheduler executables.  By default
this is <filename class="directory">/usr/lib/cups</filename> (or
<filename class="directory">/usr/lib32/cups</filename> on IRIX
6.5)</para>
</listitem>
</varlistentry>

<varlistentry>
<term><guilabel>Configuration</guilabel></term>
<listitem>
<para>The root folder for the scheduler.  By default, <filename
class="directory">/etc/cups</filename>.</para>
<para>On the authors SuSE system, this is <filename
class="directory">/usr/share/doc/cups</filename>.  It contains all the
<acronym>HTML</acronym> or <acronym>PDF</acronym> documentation for
&CUPS; which is available through the Web interface at <ulink
url="http://localhost:631/documentation.html">
http://localhost:631/documentation.html</ulink></para>
</listitem>
</varlistentry>

<varlistentry>
<term><guilabel>Data</guilabel></term>
<listitem>
<para>The root folder for the &CUPS; data files.  By default this
is <filename class="directory">/usr/share/cups</filename></para>
<para>It contains such things as banners, charsets, data, drivers,
fonts, and <command>pstoraster</command> templates.</para>
</listitem>
</varlistentry>

<varlistentry>
<term><guilabel>Temporary files</guilabel></term>
<listitem>
<para>The folder to put temporary files in.  This folder must be
writable by the user defined on the previous screen.  This defaults to
either <filename class="directory">/var/spool/cups/tmp</filename> or
the value of the <envar>TMPDIR</envar> environment variable.</para>
</listitem>
</varlistentry>

<varlistentry>
<term><guilabel>Temporary Requests</guilabel></term>
<listitem>
<para>The folder where request files are stored.  By default this
is <filename class="directory">/var/spool/cups</filename></para>
</listitem>
</varlistentry>

<varlistentry>
<term><guilabel>Font path</guilabel></term>
<listitem>
<para>The place to configure the &CUPS; server for handling your fancy
fonts (TrueType or &PostScript;).  &CUPS; will look here for fonts to
embed in printfiles.  This currently only affects the
<command>pstoraster</command> filter, and the default is <filename
class="directory">/usr/share/cups/fonts</filename>.</para>

<para>To specify more than one folder, list them with double colons as
separator. Do it like this:</para>

<informalexample>
<para><userinput>/path/to/first/fontdir/:/path/to/second/fontdir/:/path/to/last/fontdir/</userinput></para>
</informalexample>

<para>For the Font path directive to work as intended, the application
that wants to print needs to:</para>

<itemizedlist>
<listitem>
<para>Either correctly reference its desired fonts in the header of the
generated &PostScript;</para>
</listitem>
<listitem>
<para>Or embed the font into the &PostScript; file.</para>
</listitem>
</itemizedlist>

<para><emphasis>Referencing</emphasis> the font by name leaves it up
to the <acronym>RIP</acronym> and print device to respect and actually
use it. <acronym>RIP</acronym> or printer <emphasis>can</emphasis>
only use the desired font, if it is available on the system.</para>

<para> In the case of a &PostScript; printer, this needs to be a
printer-resident font. If the printers doesn't have this font, it will
try and replace it by an adequately similar font.</para>

<para>In the case of a non &PostScript; printer, this is done by
&CUPS; and its <acronym>RIP</acronym>-ing filtering system. &CUPS;
will use the font path directive to grab the correct font when
<acronym>RIP</acronym>-ing the &PostScript; in the
<command>pstoraster</command> filter.</para>

<para>In the case of a &PostScript; output device, &CUPS; is just
spooling the file (actually, it is passing it through the
<command>pstops</command> filter for accounting or n-up purposes), not
<quote>working</quote> on it. Therefore, if you print to a
&PostScript; printer it is solely the printer's responsibility to use
the font asked for. It can't, if the font is neither loaded into the
printer nor embedded in the &PostScript;.
</para>
</listitem>
</varlistentry>
</variablelist>

</sect1>
<sect1 id="server-configuration">
<title>Server <acronym>HTTP</acronym>
Configuration</title>

<para>The dialog to configure the &CUPS; server &HTTP; settings
is shown here.</para>
<para>&CUPS; server &HTTP; settings are the following ones: </para>
<itemizedlist>
<listitem><para>the <guilabel>Document folder</guilabel></para></listitem>
<listitem><para>the <guilabel>Default Language</guilabel></para></listitem>
<listitem><para>the <guilabel>Default Charset</guilabel></para></listitem>
</itemizedlist>

<screenshot>
<screeninfo>Dialog to configure the &CUPS; server &HTTP; settings
</screeninfo>
<mediaobject>
<imageobject>
<imagedata fileref="cupsserverconfiguration5_HTTP.png"
format="PNG"/></imageobject>
<textobject>
<phrase>Dialog to configure the &CUPS; server &HTTP; settings
</phrase></textobject>
</mediaobject>
</screenshot>

<variablelist>
<varlistentry>
<term><guilabel>Document folder</guilabel></term>
<listitem>
<para>The root folder for &HTTP; documents that are served.  By
default the compiled in folder, <filename
class="directory">/usr/share/cups/doc-root</filename></para>
</listitem>
</varlistentry>

<varlistentry>
<term><guilabel>Default Language</guilabel></term>
<listitem>
<para>The default language, if not specified by the browser.  If not
specified, the current locale is used.</para>
<informalexample>
<para>Use the two letter locale codes, for example
<userinput>en</userinput> or <userinput>de</userinput>.</para>
</informalexample>
<!-- available languages? -->
</listitem>
</varlistentry>

<varlistentry>
<term><guilabel>Default charset</guilabel></term>
<listitem>
<para>The default character set to use. If not specified, this
defaults to UTF-8.  This can also be overridden directly in the
<acronym>HTML</acronym> documents.</para>
</listitem>
</varlistentry>
</variablelist>
</sect1>

<sect1 id="server-encryption-support-configuration">
<title><guilabel>Server encryption support configuration</guilabel></title>

<para>This is the dialog to configure the &CUPS; server security
settings. The server encryption support settings are these: </para>

<itemizedlist>
<listitem><para><guilabel>Server certificate</guilabel>: the file to
read containing the server's certificate</para></listitem> 
<listitem><para>Server key: the file to read containing the server's
key</para></listitem>
</itemizedlist>
<screenshot>
<screeninfo>&CUPS; server configuration dialog: security overview</screeninfo>
<mediaobject>
<imageobject>
<imagedata fileref="cupsserverconfiguration6_encryption.png"
format="PNG"/></imageobject>
<textobject>
<phrase>The dialog to configure the &CUPS; server: security settings</phrase></textobject>
</mediaobject>
</screenshot>

<variablelist>
<varlistentry>
<term><guilabel>Server certificate</guilabel></term>
<listitem>
<para>The file to read containing the server's certificate.  Defaults
to <filename>/etc/cups/ssl/server.crt</filename>.</para>
</listitem>
</varlistentry>

<varlistentry>
<term><guilabel>Server key</guilabel></term>
<listitem>
<para>The file to read containing the server's key.  Defaults to
<filename>/etc/cups/ssl/server.key</filename></para>
</listitem>
</varlistentry>
</variablelist>

</sect1>

<sect1 id="server-miscellaneous-configuration">
<title>Server Miscellaneous Configuration</title>

<para>The dialog to configure the &CUPS; server miscellaneous settings
is shown here. The following server settings are done through this
screen:</para>

<itemizedlist>
<listitem><para><guilabel>Preserve job history</guilabel>: whether to
preserve a job history for later re-view</para></listitem>
<listitem><para><guilabel>Preserve job files</guilabel>: whether to
preserve fully <acronym>RIP</acronym>-ed job files for later
re-print</para></listitem>  
<listitem><para><guilabel>Printcap file</guilabel>: setting the name
of and the path to a printcap file</para></listitem>
<listitem><para><guilabel>RIP Cache</guilabel>: setting the size of
the <acronym>RIP</acronym> cache in memory</para></listitem>
<listitem><para><guilabel>Filter Limit</guilabel>: defining a filter
limit</para></listitem>
</itemizedlist>

<screenshot>
<screeninfo>Dialog to configure the &CUPS; server miscellaneous settings</screeninfo>
<mediaobject>
<imageobject>
<imagedata fileref="cupsserverconfiguration7_miscellanious.png"
format="PNG"/></imageobject>
<textobject>
<phrase>Dialog to configure the &CUPS; server miscellaneous
settings</phrase></textobject>
</mediaobject>
</screenshot>

<variablelist>
<varlistentry>
<term><guilabel>Preserve job history (after completion)</guilabel></term>
<listitem>
<para>Whether or not to preserve the job history after a job is
completed, canceled, or stopped.  The default is yes</para>
</listitem>
</varlistentry>

<varlistentry>
<term><guilabel>Preserve job file (after completion)</guilabel></term>
<listitem>
<para>Whether or not to preserve the job files after a job is
completed, canceled, or stopped. The default is no.</para>
</listitem>
</varlistentry>

<varlistentry>
<term><guilabel>Printcap file</guilabel></term>
<listitem>
<para>The name of the printcap file.  The default is no filename.
Leave this blank, to disable printcap file generation.</para>
<para>The printcap setting is only needed to satisfy older
applications in need of such a file.</para>
</listitem>
</varlistentry>

<varlistentry>
<term><guilabel>RIP cache</guilabel></term>
<listitem>
<para>The amount of memory that each <acronym>RIP</acronym> should use
to cache bitmaps.  The value can be any real number, followed by
<quote>k</quote> for kilobytes, <quote>m</quote> for megabytes,
<quote>g</quote>for gigabytes, or <quote>t</quote> for tiles, where
one tile is 256 x 256 pixels.  The default value is 8m.</para>
</listitem>
</varlistentry>

<varlistentry>
<term><guilabel>Filter limit</guilabel></term>
<listitem>
<para>Sets the maximum cost of all job filters that can be run at the
same time.  A limit of 0 means no limit.  A typical job may need a
filter limit of at least 200.  Limits less than the minimum required
by a job force a single job to be printed at any time.  The default
limit is 0 (unlimited).</para>
</listitem>
</varlistentry>
</variablelist>
</sect1>

<sect1 id="network-general-configuration">
<title>Network General Configuration</title>

<para>The dialog to configure the &CUPS; server network settings is
shown here. It includes:</para>

<itemizedlist>
<listitem><para><guilabel>Look for hostname on IP
addresses</guilabel></para></listitem>
<listitem><para><guilabel>Port</guilabel></para></listitem>
<listitem><para><guilabel>Max request size</guilabel></para></listitem>
<listitem><para><guilabel>Timeout</guilabel></para></listitem>
</itemizedlist>

<screenshot>
<screeninfo>Dialog to configure the &CUPS; server network settings</screeninfo>
<mediaobject>
<imageobject>
<imagedata fileref="cupsserverconfiguration8_networkgeneral.png"
format="PNG"/></imageobject>
<textobject>
<phrase>Dialog to configure the &CUPS; server network
settings</phrase></textobject>
</mediaobject>
</screenshot>
<variablelist>
<varlistentry>
<term><guilabel>Look for hostname on IP addresses</guilabel></term>
<listitem>
<para>Whether or not to do lookups on <acronym>IP</acronym> addresses
to get a fully-qualified hostname.  This defaults to off, for
performance reasons.</para>
</listitem>
</varlistentry>

<varlistentry>
<term><guilabel>Port</guilabel></term>
<listitem>
<para>Enter here Ports and addresses that the server will listen to.
The default port 631 is reserved for the Internet Printing Protocol,
and is what we use here.</para>
<para>You can have multiple entries, to listen to more than one port
or address, or to restrict access.</para>
<note>
<para>Unfortunately, most web browsers don't support
<acronym>TLS</acronym> or &HTTP; upgrades for encryption.  If you want
to support web-based encryption, you'll probably need to listen on
port 443, the <acronym>HTTPS</acronym> port.</para>
</note>
<para>Use the <guibutton>Add</guibutton> and
<guibutton>Remove</guibutton> buttons to add and remove entries from
the list.</para>
<informalexample>
<para>You can enter ports on their own, &eg;
<userinput>631</userinput>, or hostnames with ports, &eg;
<userinput>myhost:80</userinput> or <userinput>1.2.3.4:631</userinput>.</para>
</informalexample>
</listitem>
</varlistentry>

<varlistentry>
<term><guilabel>Max request size</guilabel></term>
<listitem>
<para>Controls the maximum size of &HTTP; requests and print files.
The default setting is 0, which disables this feature.</para>
</listitem>
</varlistentry>

<varlistentry>
<term><guilabel>Timeout</guilabel></term>
<listitem>
<para>The timeout (in seconds) before requests time out.  The default
is 300 seconds.</para>
</listitem>
</varlistentry>
</variablelist>

</sect1>

<sect1 id="network-clients-configuration">
<title>Network Clients Configuration</title>

<para>The dialog to configure the &CUPS; network client settings is
shown here. It includes:</para>

<itemizedlist>
<listitem><para><guilabel>Accept "Keep Alive"
requests</guilabel></para></listitem>
<listitem><para>KeepAliveTimeout:</para> </listitem>
<listitem><para>MaxClients: </para></listitem>
</itemizedlist>
<screenshot>
<screeninfo>dialog to configure the &CUPS; network client settings</screeninfo>
<mediaobject>
<imageobject>
<imagedata fileref="cupsserverconfiguration9_networkclients.png"
format="PNG"/></imageobject>
<textobject>
<phrase>Dialog to configure the &CUPS; network client settings</phrase></textobject>
</mediaobject>
</screenshot>

<variablelist>
<varlistentry>
<term><guilabel>Accept "Keep Alive" requests</guilabel></term>
<listitem>
<para>Whether or not to support the Keep-Alive connection option. The
default is on.</para>
</listitem>
</varlistentry>

<varlistentry>
<term><guilabel>Keep alive timeout</guilabel></term>
<listitem>
<para>The timeout (in seconds) before Keep-Alive connections are
automatically closed.  The default is 60 seconds.</para>
</listitem>
</varlistentry>

<varlistentry>
<term><guilabel>Max number of clients</guilabel></term>
<listitem>
<para>Controls the maximum number of simultaneous clients that will be
handled.  Defaults to 100.</para>
</listitem>
</varlistentry>
</variablelist>

</sect1>

<sect1 id="browsing-general-configuration">
<title>Browsing General Configuration</title>

<para>The dialog to configure the &CUPS; browsing general settings
is shown here. It includes: </para>

<itemizedlist>
<listitem><para><guilabel>Enable browsing</guilabel></para></listitem>
<listitem><para><guilabel>Use short names when
possible</guilabel></para></listitem>
<listitem><para><guilabel>Use implicit
classes</guilabel></para></listitem>
</itemizedlist>


<screenshot>
<screeninfo>Dialog to configure the &CUPS; browsing general
settings</screeninfo>
<mediaobject>
<imageobject>
<imagedata fileref="cupsserverconfiguration10_browsinggeneral.png"
format="PNG"/></imageobject>
<textobject>
<phrase>Dialog to configure the &CUPS; browsing general
settings</phrase></textobject>
</mediaobject>
</screenshot>

<variablelist>
<varlistentry>
<term><guilabel>Enable browsing</guilabel></term>
<listitem>
<para>Whether or not to broadcast printer information to other &CUPS;
servers.  Enabled by default.</para>
</listitem>
</varlistentry>

<varlistentry>
<term><guilabel>Use short names when possible</guilabel></term>
<listitem>
<para>Whether or not to use <quote>short</quote> names for remote
printers when possible (&eg; <systemitem
class="resource">printer</systemitem> instead of <systemitem
class="resource">printer@host</systemitem>).  Enabled by
default.</para>
</listitem>
</varlistentry>

<varlistentry>
<term><guilabel>Use implicit classes</guilabel></term>
<listitem>
<para>Whether or not to use implicit classes.</para>
<para>Printer classes can be specified explicitly, in the
<filename>classes.conf</filename> file, implicitly based upon the
printers available on the <acronym>LAN</acronym>, or both.</para>
<para>When Implicit classes are enabled, printers on the
<acronym>LAN</acronym> with the same name (&eg; <systemitem
class="resource">Acme-LaserPrint-1000</systemitem>) will be put into
a class with the same name.  This allows you to setup multiple
redundant queues on a <acronym>LAN</acronym> without a lot of
administrative difficulties.  If a user sends a job to <systemitem
class="resource">Acme-LaserPrint-1000</systemitem>, the job will go to
the first available queue.</para>
<para>This option is enabled by default.</para>
</listitem>
</varlistentry>
</variablelist>

</sect1>
<sect1 id="browsing-connection-configuration">
<title>Browsing Connection Configuration</title>

<para>The dialog to configure the &CUPS; server browsing connection is
shown here. Browsing connection settings include:</para>

<itemizedlist>
<listitem><para><guilabel>Broadcast addresses</guilabel>: The
(<acronym>UDP</acronym>) broadcast address to transmit printer
information to</para></listitem>
<listitem><para><guilabel>Broadcast Port</guilabel>: The port number
to use for broadcasting</para></listitem> 
<listitem><para><guilabel>Poll addresses</guilabel>: The address(es)
to poll for information about printers on servers that might not
broadcast (or whose broadcasts might not reach your
<acronym>LAN</acronym> due to routers in between).</para></listitem>
</itemizedlist>

<screenshot>
<screeninfo>Dialog to configure the &CUPS; server browsing
connection</screeninfo>
<mediaobject>
<imageobject>
<imagedata fileref="cupsserverconfiguration11_browsingconnections.png"
format="PNG"/></imageobject>
<textobject>
<phrase>Dialog to configure the &CUPS; server browsing
connection</phrase></textobject>
</mediaobject>
</screenshot>

<variablelist>
<varlistentry>
<term><guilabel>Broadcast addresses</guilabel></term>
<listitem>
<para>After pressing the <guibutton>Add</guibutton> button, you will
see the following dialog to enter a new value for outgoing
broadcasting browse packets. It is the same kind of dialog as for
adding other &CUPS; server addresses to be polled for printer
information.</para>

<screenshot>
<screeninfo>Dialog to enter a new value for broadcasting browse
packets to</screeninfo>
<mediaobject>
<imageobject>
<imagedata fileref="cupsserverconfig_browsingmasks_add_button.png"
format="PNG"/></imageobject>
<textobject>
<phrase>Dialog to enter a new value for broadcasting browse packets
to</phrase></textobject>
</mediaobject>
</screenshot>

<para>This option specifies a broadcast address to be used.  By
default, browsing information is broadcast to all active
interfaces.</para>
</listitem>
</varlistentry>

<varlistentry>
<term><guilabel>Broadcast port</guilabel></term>
<listitem>
<para>The port used for <acronym>UDP</acronym> broadcasts.  By default
this is the <acronym>IPP</acronym> port; if you change this, you need
to do it on all servers.  Only one BrowsePort is recognized.</para>
</listitem>
</varlistentry>

<varlistentry>
<term><guilabel>Poll addresses</guilabel></term>
<listitem>
<para>Poll the named server(s) for printers.</para>
</listitem>
</varlistentry>
</variablelist>

</sect1>
<sect1 id="browsing-masks-configuration">
<title>Browsing Masks Configuration</title>

<para>The dialog to configure the &CUPS; server allowed and/or denied browse
packets from other servers is shown here.</para>

<itemizedlist>
<listitem><para><guilabel>Browse allow</guilabel>: </para></listitem>
<listitem><para><guilabel>Browse deny</guilabel>: </para></listitem>
<listitem><para><guilabel>Browse order</guilabel>: </para></listitem>
</itemizedlist>

<screenshot>
<screeninfo>Dialog to configure the &CUPS; server allowed and/or
denied browse packets from other servers</screeninfo>
<mediaobject>
<imageobject>
<imagedata fileref="cupsserverconfiguration11_browsingmasks.png"
format="PNG"/></imageobject>
<textobject>
<phrase>Dialog to configure the &CUPS; server allowed and/or denied
browse packets from other servers</phrase></textobject>
</mediaobject>
</screenshot>

<variablelist>
<varlistentry>
<term><guilabel>Add Browse Address</guilabel> dialog</term>
<listitem>
<para>The dialog to enter a new value for the address of another
&CUPS; server to accept browse packets from is shown here. It is opened
by clicking on the <guibutton>Add...</guibutton> button beside the
field named <guilabel>Browse Allow:</guilabel>. It is the same dialog
as for adding <quote>denied</quote> broadcast sending
addresses.</para>

<para>The dialog to enter a new value for the address of another
&CUPS; server to accept browse packets from is shown here.</para>

<screenshot>
<screeninfo>Dialog to enter a new value for the address of another
&CUPS; server to accept browse packets from</screeninfo>
<mediaobject>
<imageobject>
<imagedata fileref="cupsserverconfig_browsingmasks_add_button.png"
format="PNG" /></imageobject>
<textobject>
<phrase>Dialog to enter a new value for the address of another &CUPS;
server to accept browse packets from</phrase></textobject>
</mediaobject>
</screenshot>
</listitem>
</varlistentry>

<varlistentry>
<term><guilabel>Browse allow</guilabel> and <guilabel>Browse
deny</guilabel></term>
<listitem>
<para><guilabel>Browse allow</guilabel> specifies an address mask to
allow for incoming browser packets.  The default is to allow packets
from all addresses.</para>
<para><guilabel>Browse deny</guilabel> specifies an address mask to
deny for incoming browser packets.  The default is to deny packets
from no addresses.</para>
<para>Both <guilabel>Browse allow</guilabel> and <guilabel>Browse
deny</guilabel> accept the following notations for addresses:</para>

<informalexample>
<itemizedlist>
<listitem>
<para><userinput>All</userinput></para>
</listitem>
<listitem>
<para><userinput>None</userinput></para>
</listitem>
<listitem>
<para><userinput>*.domain.com</userinput></para>
</listitem>
<listitem>
<para><userinput>.domain.com</userinput></para>
</listitem>
<listitem>
<para><userinput>host.domain.com</userinput></para>
</listitem>
<listitem>
<para><userinput>nnn.*</userinput></para>
</listitem>
<listitem>
<para><userinput>nnn.nnn.*</userinput></para>
</listitem>
<listitem>
<para><userinput>nnn.nnn.nnn.*</userinput></para>
</listitem>
<listitem>
<para><userinput>nnn.nnn.nnn.nnn</userinput></para>
</listitem>
<listitem>
<para><userinput>nnn.nnn.nnn.nnn/mmm</userinput></para>
</listitem>
<listitem>
<para><userinput>nnn.nnn.nnn.nnn/mmm.mmm.mmm.mmm</userinput></para>
</listitem>
</itemizedlist>
</informalexample>

<para>The hostname/domain name restrictions will only work if you have
turned hostname lookups on!</para>
</listitem>
</varlistentry>

<varlistentry>
<term><guilabel>Browse order</guilabel></term>
<listitem>
<para>Specifies the order of the allow/deny comparisons.</para>
</listitem>
</varlistentry>
</variablelist>

</sect1>

<sect1 id="browsing-timeouts-configuration">
<title>Browsing Timeouts Configuration</title>

<para>The dialog to configure the &CUPS; server browse timeout settings
is shown here. Browse timeout settings include:</para>
<itemizedlist>
<listitem><para><guilabel>Browse Interval</guilabel></para></listitem>
<listitem><para><guilabel>Browse Timeout</guilabel></para></listitem>
</itemizedlist>
<screenshot>
<screeninfo>Dialog to configure the &CUPS; server browse timeout
settings</screeninfo>
<mediaobject>
<imageobject>
<imagedata fileref="cupsserverconfiguration12_browsingtimeouts.png"
format="PNG"/></imageobject>
<textobject>
<phrase>dialog to configure the &CUPS; server browse timeout
settings</phrase></textobject>
</mediaobject>
</screenshot>

<variablelist>
<varlistentry>
<term><guilabel>Browse interval</guilabel></term>
<listitem>
<para>The time between browsing updates in seconds.  The default is 30
seconds.</para>
<para>Note that browsing information is sent whenever a printer's
state changes as well, so this represents the maximum time between
updates.</para>
<para>Set this to 0 to disable outgoing broadcasts so your local
printers are not advertised, but you can still see printers on other
hosts.</para>
</listitem>
</varlistentry>

<varlistentry>
<term>Browse timeouts</term>
<listitem>
<para>The timeout (in seconds) for network printers - if we don't get
an update within this time, the printer will be removed from the
printer list.</para>
<para>This number definitely should not be less than the browse
interval period, for obvious reasons.  Defaults to 300 seconds.</para>
</listitem>
</varlistentry>
</variablelist>

</sect1>
<sect1 id="browsing-relay-configuration">
<title>Browsing Relay Configuration</title>

<para>The dialog to configure the &CUPS; server as a browsing relay is
shown here. Browsing relay settings include:</para>

<itemizedlist>
<listitem><para><guilabel>Browser packets relay</guilabel></para></listitem>
</itemizedlist>

<screenshot>
<screeninfo>Dialog to configure the &CUPS; server as a browsing
relay</screeninfo> 
<mediaobject>
<imageobject>
<imagedata fileref="cupsserverconfiguration14_browsingrelay.png"
format="PNG"/></imageobject>
<textobject>
<phrase>Dialog to configure the &CUPS; server as a browsing
relay</phrase></textobject> 
</mediaobject>
</screenshot>

<variablelist>
<varlistentry>
<term>Add Browse Relay dialog</term>
<listitem>
<para>The dialog to enter a new value for an address pair to define
browsing relaying between a &CUPS; server and a network is shown
here.</para>

<screenshot>
<screeninfo>The dialog to enter a new value for an address pair to
define browsing relaying between a &CUPS; server and a
network</screeninfo>
<mediaobject>
<imageobject>
<imagedata fileref="cupsserverconfig_browse_relay_add_button.png"
format="PNG"/></imageobject>
<textobject>
<phrase>The dialog to enter a new value for an address pair to define
browsing relaying between a &CUPS; server and a
network</phrase></textobject>
</mediaobject>
</screenshot>
</listitem>
</varlistentry>

<varlistentry>
<term><guilabel>Browser packets relay</guilabel></term>
<listitem>
<para>Relay browser packets from one address or network to
another.</para>
</listitem>
</varlistentry>
</variablelist>

</sect1>

<sect1 id="security-configuration">
<title>Security Configuration</title>

<para>The dialog to configure the &CUPS; server security settings for
any of the defined server locations is shown here. It contains the
following settings, which may be defined separately for any valid
resource (or location) of the &CUPS; server:</para>

<itemizedlist>
<listitem><para>System Group:</para></listitem>
<listitem><para>Access Permissions: </para></listitem>
<listitem><para>Auth Type:</para></listitem>
<listitem><para>Auth Class:</para></listitem>
<listitem><para>Auth Group Name:</para></listitem>
<listitem><para>Encryption:</para></listitem>
<listitem><para>Allow:</para></listitem>
<listitem><para>Deny:</para></listitem>
<listitem><para>Order:</para></listitem>
</itemizedlist>

<para>Valid resources (or locations) of the &CUPS; server are:</para>

<itemizedlist>
<listitem><para>Server Root Location: <systemitem
class="resource">/</systemitem> </para></listitem> 
<listitem><para>Server Administration Location: <systemitem
class="resource">/admin</systemitem></para></listitem>
<listitem><para>All printers on the server: <systemitem
class="resource">/printers</systemitem></para></listitem>
<listitem><para>Any individual printer on the server:
&eg; <systemitem
class="resource">/printers/infotec_P320</systemitem></para></listitem> 
<listitem><para>All printer classes on the server: <systemitem
class="resource">/classes</systemitem>:</para></listitem> 
<listitem><para>Any individual printer class on the server:
&eg; <systemitem
class="resource">/classes/all_infotecs_P320_or_P450</systemitem></para></listitem> 
</itemizedlist>

<screenshot>
<screeninfo>Dialog to configure the &CUPS; server security settings
for any of the defined server locations</screeninfo>
<mediaobject>
<imageobject>
<imagedata fileref="cupsserverconfiguration_securityoverview.png"
format="PNG"/></imageobject>
<textobject>
<phrase>dialog to configure the &CUPS; server security settings for
any of the defined server locations</phrase></textobject>

</mediaobject>
</screenshot>

<note>
<para>For all locations that are not defined separately the setting of
the location <quote>above</quote> it is valid.</para>

<para>For example, you have a printer named <systemitem
class="resource">infotec_P450</systemitem> with no set security
options. Then the security of the location <systemitem
class="resource">/printers</systemitem> will take the responsibility
for this printer as it is a sub-location of<systemitem
class="resource">/printers</systemitem>. If, in turn there is no
security set for <systemitem class="resource">/printers</systemitem>,
then the security for <systemitem class="resource">/</systemitem> (the
general security) of the server takes responsibility. Either you have
set this for your purpose or the compiled-in default value takes
over.</para>
</note>

<variablelist>
<varlistentry>
<term>SystemGroup</term>
<listitem>
<para>The group name for <systemitem
class="groupname">System</systemitem> or printer administration
access.  The default varies depending on the operating system, but
will be <systemitem class="groupname">lpadmin</systemitem>, <systemitem
class="groupname">system</systemitem> or <systemitem
class="groupname">root</systemitem> (checked for in that order).</para>
</listitem>
</varlistentry>

<varlistentry>
<term>Access Permissions</term>
<listitem>
<para>Access permissions for each folder served by the scheduler.
Locations are relative to the document root.</para>
</listitem>
</varlistentry>

<varlistentry>
<term>Authorization Type</term>
<listitem>
<para>The authorization to use:</para>

<variablelist>
<varlistentry>
<term>None</term>
<listitem>
<para>Perform no authentication.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>Basic</term>
<listitem>
<para>Perform authentication using the &HTTP; Basic method.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>Digest</term>
<listitem>
<para>Perform authentication using the &HTTP; Digest method.</para>
</listitem>
</varlistentry>
</variablelist>

<note>
<para>Local certificate authentication can be substituted by the
client for Basic or Digest, when connecting to the localhost
interface.</para>
</note>
</listitem>
</varlistentry>

<varlistentry>
<term>Authorization Class</term>
<listitem>
<para>The authorization class.  Currently only
<quote>Anonymous</quote>, <quote>User</quote>, <quote>System</quote>
(valid user belonging to the group set as system group), and
<quote>group</quote> (valid user belonging to the specified group) are
supported.</para>
</listitem>
</varlistentry>

<varlistentry>
<term>Authorization Group Name</term>
<listitem>
<para>The group name for <quote>Group</quote> authorization</para>
</listitem>
</varlistentry>

<varlistentry>
<term>Encryption</term>
<listitem>
<para>Whether or not to use encryption.  This depends on having the
<application>OpenSSL</application> linked into the &CUPS; library and
scheduler.</para>
<para>Possible values are:</para>
<variablelist>
<varlistentry>
<term>Always</term>
<listitem>
<para>Always use encryption (<acronym>SSL</acronym>)</para>
</listitem>
</varlistentry>
<varlistentry>
<term>Never</term>
<listitem>
<para>Never use encryption.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>Required</term>
<listitem>
<para>Use <acronym>TLS</acronym> encryption upgrade.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>IfRequested</term>
<listitem>
<para>Use encryption if the server requests it.</para>
</listitem>
</varlistentry>
</variablelist>
</listitem>
</varlistentry>

<varlistentry>
<term><guilabel>Allow</guilabel></term>
<listitem>
<para>Allows access from the specified hostname, domain,
<acronym>IP</acronym> address or network.  Possible values are:</para>

<informalexample>
<itemizedlist>
<listitem>
<para><userinput>All</userinput></para>
</listitem>
<listitem>
<para><userinput>None</userinput></para>
</listitem>
<listitem>
<para><userinput>*.domain.com</userinput></para>
</listitem>
<listitem>
<para><userinput>.domain.com</userinput></para>
</listitem>
<listitem>
<para><userinput>host.domain.com</userinput></para>
</listitem>
<listitem>
<para><userinput>nnn.*</userinput></para>
</listitem>
<listitem>
<para><userinput>nnn.nnn.*</userinput></para>
</listitem>
<listitem>
<para><userinput>nnn.nnn.nnn.*</userinput></para>
</listitem>
<listitem>
<para><userinput>nnn.nnn.nnn.nnn</userinput></para>
</listitem>
<listitem>
<para><userinput>nnn.nnn.nnn.nnn/mmm</userinput></para>
</listitem>
<listitem>
<para><userinput>nnn.nnn.nnn.nnn/mmm.mmm.mmm.mmm</userinput></para>
</listitem>
</itemizedlist>
</informalexample>

<para>The host and domain address require that you enable hostname
lookups, as described earlier.</para>
</listitem>
</varlistentry>

<varlistentry>
<term><guilabel>Deny</guilabel></term>
<listitem>
<para>Denies access from the specified hostname, domain,
<acronym>IP</acronym> address or network.  Possible values are:</para>
<informalexample>
<itemizedlist>
<listitem>
<para><userinput>All</userinput></para>
</listitem>
<listitem>
<para><userinput>None</userinput></para>
</listitem>
<listitem>
<para><userinput>*.domain.com</userinput></para>
</listitem>
<listitem>
<para><userinput>.domain.com</userinput></para>
</listitem>
<listitem>
<para><userinput>host.domain.com</userinput></para>
</listitem>
<listitem>
<para><userinput>nnn.*</userinput></para>
</listitem>
<listitem>
<para><userinput>nnn.nnn.*</userinput></para>
</listitem>
<listitem>
<para><userinput>nnn.nnn.nnn.*</userinput></para>
</listitem>
<listitem>
<para><userinput>nnn.nnn.nnn.nnn</userinput></para>
</listitem>
<listitem>
<para><userinput>nnn.nnn.nnn.nnn/mmm</userinput></para>
</listitem>
<listitem>
<para><userinput>nnn.nnn.nnn.nnn/mmm.mmm.mmm.mmm</userinput></para>
</listitem>
</itemizedlist>
</informalexample>
<para>The host and domain address require that you enable hostname
lookups, as described earlier.</para>
</listitem>
</varlistentry>

<varlistentry>
<term>Order</term>
<listitem>
<para>The order of the allow and deny processing.</para>
</listitem>
</varlistentry>
</variablelist>
</sect1>

<sect1 id="example-how-define-security-for-all-printers">
<title>Example: How To Define The Security For All Printers</title>

<para>The dialog to configure the &CUPS; server security settings is
discussed here. We use the example to add security definitions other
than the default ones for the resource named <systemitem
class="resource">all printers</systemitem>. For the &CUPS; web server,
this is the location you access through <ulink
url="http://localhost:631/printers/">
http://localhost:631/printers/</ulink> or (remotely) through <ulink
url="http://cups.server.name:631/printers/">
http://cups.server.name:631/printers/</ulink></para>

<para>The first screenshot shows the general location for this
setting. <guilabel>Select</guilabel> <guibutton>Add</guibutton> or
<guibutton>Modify</guibutton> a resource for which you want to decide
about its security settings.</para>

<screenshot>
<screeninfo>Dialog to configure the &CUPS; server security
settings</screeninfo><mediaobject>
<imageobject>
<imagedata fileref="cupsserverconfiguration15a_resourceallprinters_defineaccess.png"
format="PNG"/></imageobject>
<textobject>
<phrase>Dialog to configure the &CUPS; server security
settings</phrase></textobject>
</mediaobject>
</screenshot>

<para>This dialog is to add a new resource.  It looks similar if you
want to modify an already existing resource. Here are the general
options:</para>

<screenshot>
<screeninfo>Dialog to add a new resource.</screeninfo>
<mediaobject>
<imageobject>
<imagedata fileref="cupsserverconfiguration15b_resourceallprinters_defineaccess.png"
format="PNG"/></imageobject>
<textobject>
<phrase>Dialog to add a new resource.</phrase></textobject>
</mediaobject>
</screenshot>

<para>.This is the second part or the dialog is to add a new
ressource.  It looks similar if you want to modify an already existing
resource. Here you define the actual access masks for the resource in
question.</para>

<screenshot>
<screeninfo>Dialog to add a new resource.</screeninfo>
<mediaobject>
<imageobject>
<imagedata fileref="cupsserverconfiguration15c_resourceallprinters_defineaccess.png"
format="PNG"/></imageobject>
<textobject>
<phrase>Dialog to add a new resource.</phrase></textobject>
</mediaobject>
</screenshot>
<screenshot>
<screeninfo>Resource dialog</screeninfo>
<mediaobject>
<imageobject>
<imagedata fileref="cupsserverconfiguration_resourceadminaccessmasks.png"
format="PNG"/></imageobject>
<textobject>
<phrase>Resource dialog</phrase></textobject>
</mediaobject>
</screenshot>

<screenshot>
<screeninfo>Resource dialog</screeninfo>
<mediaobject>
<imageobject>
<imagedata fileref="cupsserverconfiguration_resourceadminaddprinters.png"
format="PNG"/></imageobject>
<textobject>
<phrase>Resource dialog</phrase></textobject>
</mediaobject>
</screenshot>

<screenshot>
<screeninfo>Resource dialog</screeninfo>
<mediaobject>
<imageobject>
<imagedata fileref="cupsserverconfiguration_resourceadminaddprinters_defineaccess.png"
format="PNG"/></imageobject>
<textobject>
<phrase>Resource dialog</phrase></textobject>
</mediaobject>
</screenshot>

<screenshot>
<screeninfo>Resource dialog</screeninfo>
<mediaobject>
<imageobject>
<imagedata fileref="cupsserverconfiguration_resourceadminauthorization.png"
format="PNG"/></imageobject>
<textobject>
<phrase>Resource dialog</phrase></textobject>
</mediaobject>
</screenshot>

</sect1>

</chapter>
