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 © 2020-2022 by OpenPrinting.