1cups-lpd(8) OpenPrinting cups-lpd(8)
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6 cups-lpd - receive print jobs and report printer status to lpd clients
7 (deprecated)
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10 cups-lpd [ -h hostname[:port] ] [ -n ] [ -o option=value ]
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13 cups-lpd is the CUPS Line Printer Daemon ("LPD") mini-server that sup‐
14 ports legacy client systems that use the LPD protocol. cups-lpd does
15 not act as a standalone network daemon but instead operates using any
16 of the Internet "super-servers" such as inetd(8), launchd(8), and sys‐
17 temd(8).
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20 -h hostname[:port]
21 Sets the CUPS server (and port) to use.
22 -n Disables reverse address lookups; normally cups-lpd will try to
24 discover the hostname of the client via a reverse DNS lookup.
25 -o name=value
27 Inserts options for all print queues. Most often this is used to
28 disable the "l" filter so that remote print jobs are filtered as
29 needed for printing; the inetd(8) example below sets the "docu‐
30 ment-format" option to "application/octet-stream" which forces au‐
31 todetection of the print file format.
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34 cups-lpd does not enforce the restricted source port number specified
35 in RFC 1179, as using restricted ports does not prevent users from sub‐
36 mitting print jobs. While this behavior is different than standard
37 Berkeley LPD implementations, it should not affect normal client opera‐
38 tions.
39 The output of the status requests follows RFC 2569, Mapping between LPD
41 and IPP Protocols. Since many LPD implementations stray from this defi‐
42 nition, remote status reporting to LPD clients may be unreliable.
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45 Errors are sent to the system log.
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48 /etc/inetd.conf
49 /etc/xinetd.d/cups-lpd
50 /System/Library/LaunchDaemons/org.cups.cups-lpd.plist
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53 The cups-lpd program is deprecated and will no longer be supported in a
54 future feature release of CUPS.
55 PERFORMANCE
57 cups-lpd performs well with small numbers of clients and printers.
58 However, since a new process is created for each connection and since
59 each process must query the printing system before each job submission,
60 it does not scale to larger configurations. We highly recommend that
61 large configurations use the native IPP support provided by CUPS in‐
62 stead.
63 SECURITY
65 cups-lpd currently does not perform any access control based on the
66 settings in cupsd.conf(5) or in the hosts.allow(5) or hosts.deny(5)
67 files used by TCP wrappers. Therefore, running cups-lpd on your server
68 will allow any computer on your network (and perhaps the entire Inter‐
69 net) to print to your server.
70 While xinetd(8) has built-in access control support, you should use the
72 TCP wrappers package with inetd(8) to limit access to only those com‐
73 puters that should be able to print through your server.
74 cups-lpd is not enabled by the standard CUPS distribution. Please con‐
76 sult with your operating system vendor to determine whether it is en‐
77 abled by default on your system.
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80 If you are using inetd(8), add the following line to the inetd.conf
81 file to enable the cups-lpd mini-server:
82 printer stream tcp nowait lp /usr/lib/cups/daemon/cups-lpd cups-lpd \
84 -o document-format=application/octet-stream
85 CUPS includes configuration files for launchd(8), systemd(8), and
88 xinetd(8). Simply enable the cups-lpd service using the corresponding
89 control program.
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92 cups(1), cupsd(8), inetd(8), launchd(8), xinetd(8), CUPS Online Help
93 (http://localhost:631/help), RFC 2569
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96 Copyright © 2020-2022 by OpenPrinting.
972021-02-28 CUPS cups-lpd(8)