1cups-lpd(8) Apple Inc. cups-lpd(8)
2
6 cups-lpd - receive print jobs and report printer status to lpd clients
7
9 cups-lpd [ -h hostname[:port] ] [ -n ] [ -o option=value ]
10
12 cups-lpd is the CUPS Line Printer Daemon ("LPD") mini-server that sup‐
13 ports legacy client systems that use the LPD protocol. cups-lpd does
14 not act as a standalone network daemon but instead operates using any
15 of the Internet "super-servers" such as inetd(8), launchd(8), and sys‐
16 temd(8).
17
19 -h hostname[:port]
20 Sets the CUPS server (and port) to use.
21 -n Disables reverse address lookups; normally cups-lpd will try to
23 discover the hostname of the client via a reverse DNS lookup.
24 -o name=value
26 Inserts options for all print queues. Most often this is used to
27 disable the "l" filter so that remote print jobs are filtered as
28 needed for printing; the inetd(8) example below sets the "docu‐
29 ment-format" option to "application/octet-stream" which forces
30 autodetection of the print file format.
31
33 cups-lpd does not enforce the restricted source port number specified
34 in RFC 1179, as using restricted ports does not prevent users from sub‐
35 mitting print jobs. While this behavior is different than standard
36 Berkeley LPD implementations, it should not affect normal client opera‐
37 tions.
38 The output of the status requests follows RFC 2569, Mapping between LPD
40 and IPP Protocols. Since many LPD implementations stray from this defi‐
41 nition, remote status reporting to LPD clients may be unreliable.
42
44 Errors are sent to the system log.
45
47 /etc/inetd.conf
48 /etc/xinetd.d/cups-lpd
49 /System/Library/LaunchDaemons/org.cups.cups-lpd.plist
50
52 PERFORMANCE
53 cups-lpd performs well with small numbers of clients and printers.
54 However, since a new process is created for each connection and since
55 each process must query the printing system before each job submission,
56 it does not scale to larger configurations. We highly recommend that
57 large configurations use the native IPP support provided by CUPS
58 instead.
59 SECURITY
61 cups-lpd currently does not perform any access control based on the
62 settings in cupsd.conf(5) or in the hosts.allow(5) or hosts.deny(5)
63 files used by TCP wrappers. Therefore, running cups-lpd on your server
64 will allow any computer on your network (and perhaps the entire Inter‐
65 net) to print to your server.
66 While xinetd(8) has built-in access control support, you should use the
68 TCP wrappers package with inetd(8) to limit access to only those com‐
69 puters that should be able to print through your server.
70 cups-lpd is not enabled by the standard CUPS distribution. Please con‐
72 sult with your operating system vendor to determine whether it is
73 enabled by default on your system.
74
76 If you are using inetd(8), add the following line to the inetd.conf
77 file to enable the cups-lpd mini-server:
78 printer stream tcp nowait lp /usr/lib/cups/daemon/cups-lpd cups-lpd \
80 -o document-format=application/octet-stream
81 Note: If you are using Solaris 10 or higher, you must run the inetd‐
84 conv(1m) program to register the changes to the inetd.conf file.
85 CUPS includes configuration files for launchd(8), systemd(8), and
87 xinetd(8). Simply enable the cups-lpd service using the corresponding
88 control program.
89
91 cups(1), cupsd(8), inetconv(1m), inetd(8), launchd(8), xinetd(8), CUPS
92 Online Help (http://localhost:631/help), RFC 2569
93
95 Copyright © 2007-2017 by Apple Inc.
963 June 2014 CUPS cups-lpd(8)