Open Source Software

cups-lpd(8)



NAME

   cups-lpd - receive print jobs and report printer status to lpd clients

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

   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

   Note: If you  are  using  Solaris  10  or  higher,  you  must  run  the
   inetdconv(1m) program to register the changes to the inetd.conf file.

   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

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

COPYRIGHT

   Copyright  2007-2016 by Apple Inc.



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