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 "super-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 reverse 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 "application/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 implementations, 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
       implementations 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 instead.

   SECURITY
       cups-lpd currently does not perform any access control based on the settings in cupsd.conf(5) or  in  the
       hosts.allow(5)  or  hosts.deny(5) files used by TCP wrappers.  Therefore, running cups-lpd on your server
       will allow any computer 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 determine 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 using 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)