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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | CONFORMING TO | ERRORS | FILES | NOTES | EXAMPLE | SEE ALSO | COPYRIGHT | COLOPHON |
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cups-lpd(8) OpenPrinting cups-lpd(8)
cups-lpd - receive print jobs and report printer status to lpd
clients (deprecated)
cups-lpd [ -h hostname[:port] ] [ -n ] [ -o option=value ]
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).
-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.
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 are sent to the system log.
/etc/inetd.conf
/etc/xinetd.d/cups-lpd
/System/Library/LaunchDaemons/org.cups.cups-lpd.plist
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.
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.
cups(1), cupsd(8), inetd(8), launchd(8), xinetd(8), CUPS Online
Help (http://localhost:631/help), RFC 2569
Copyright © 2020-2024 by OpenPrinting.
This page is part of the CUPS (a standards-based, open source
printing system) project. Information about the project can be
found at ⟨https://github.com/openprinting/cups⟩. If you have a
bug report for this manual page, see
⟨https://github.com/OpenPrinting/cups/issues⟩. This page was
obtained from the project's upstream Git repository
⟨https://github.com/openprinting/cups⟩ on 2025-02-02. (At that
time, the date of the most recent commit that was found in the
repository was 2025-01-27.) If you discover any rendering
problems in this HTML version of the page, or you believe there is
a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
2021-02-28 CUPS cups-lpd(8)
Pages that refer to this page: cupsd(8)
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HTML rendering created 2025-02-02 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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