Manual: cups-lpd

cups-lpd(8)						OpenPrinting						 cups-lpd(8)

NAME
       cups-lpd - receive print jobs and report printer status to lpd clients (deprecated)

SYNOPSIS
       cups-lpd [ -h hostname[:port] ] [ -n ] [ -o option=value ]

DESCRIPTION
       cups-lpd	 is  the  CUPS	Line Printer Daemon ("LPD") mini-server that supports legacy client systems that use the LPD
       protocol.  cups-lpd does not act as a standalone network daemon but instead operates using any of the  Internet	"su‐
       per-servers" such as inetd(8), launchd(8), and systemd(8).

OPTIONS
       -h hostname[:port]
	    Sets the CUPS server (and port) to use.

       -n   Disables  reverse  address	lookups; normally cups-lpd will try to discover the hostname of the client via a re‐
	    verse DNS lookup.

       -o name=value
	    Inserts options for all print queues. Most often this is used to disable the "l" filter  so	 that  remote  print
	    jobs  are  filtered as needed for printing; the inetd(8) example below sets the "document-format" option to "ap‐
	    plication/octet-stream" which forces autodetection of the print file format.

CONFORMING TO
       cups-lpd does not enforce the restricted source port number specified in RFC 1179, as using restricted ports does not
       prevent users from submitting print jobs.  While this behavior is different than standard  Berkeley  LPD	 implementa‐
       tions, it should not affect normal client operations.

       The output of the status requests follows RFC 2569, Mapping between LPD and IPP Protocols. Since many LPD implementa‐
       tions stray from this definition, remote status reporting to LPD clients may be unreliable.

ERRORS
       Errors are sent to the system log.

FILES
       /etc/inetd.conf
       /etc/xinetd.d/cups-lpd
       /System/Library/LaunchDaemons/org.cups.cups-lpd.plist

NOTES
       The cups-lpd program is deprecated and will no longer be supported in a future feature release of CUPS.

   PERFORMANCE
       cups-lpd	 performs well with small numbers of clients and printers.  However, since a new process is created for each
       connection and since each process must query the printing system before each job submission, it	does  not  scale  to
       larger configurations.  We highly recommend that large configurations use the native IPP support provided by CUPS in‐
       stead.

   SECURITY
       cups-lpd	 currently  does  not  perform any access control based on the settings in cupsd.conf(5) or in the hosts.al‐
       low(5) or hosts.deny(5) files used by TCP wrappers.  Therefore, running cups-lpd on your server will allow  any	com‐
       puter on your network (and perhaps the entire Internet) to print to your server.

       While  xinetd(8)	 has built-in access control support, you should use the TCP wrappers package with inetd(8) to limit
       access to only those computers that should be able to print through your server.

       cups-lpd is not enabled by the standard CUPS distribution.  Please consult with your operating system vendor  to	 de‐
       termine whether it is enabled by default on your system.

EXAMPLE
       If you are using inetd(8), add the following line to the inetd.conf file to enable the cups-lpd mini-server:

	   printer stream tcp nowait lp /usr/lib/cups/daemon/cups-lpd cups-lpd \
	       -o document-format=application/octet-stream

       CUPS  includes configuration files for launchd(8), systemd(8), and xinetd(8).  Simply enable the cups-lpd service us‐
       ing the corresponding control program.

SEE ALSO
       cups(1), cupsd(8), inetd(8), launchd(8), xinetd(8), CUPS Online Help (http://localhost:631/help), RFC 2569

COPYRIGHT
       Copyright © 2020-2024 by OpenPrinting.

2021-02-28						    CUPS						 cups-lpd(8)