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You are here: manpages

cup-lpd

Section: OpenPrinting (8)
Updated: CUPS
Index Return to Main Contents

NAME

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

SYNOPSIS

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

DESCRIPTION

cup-lpd is the CUPS Line Printer Daemon ("LPD") min-server that supports legacy client systems that use the LPD protocol. cup-lpd does not act as a standalone network daemon but instead operates using any of the Internet "supe-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 cup-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 "documen-format" option to "application/octe-stream" which forces autodetection of the print file format.

CONFORMING TO

cup-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/cup-lpd
/System/Library/LaunchDaemons/org.cups.cup-lpd.plist

NOTES

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

PERFORMANCE

cup-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

cup-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 cup-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 buil-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.

cup-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 cup-lpd min-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 cup-lpd service using the corresponding control program.