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NAME
papd - AppleTalk print server daemon
SYNOPSIS
papd [-d] [-f configfile] [-p printcap]
DESCRIPTION
papd is the AppleTalk printer daemon. This daemon accepts print jobs from AppleTalk
clients (typically Macintosh computers) using the Printer Access Protocol (PAP). When used
with System V printing systems, papd spools jobs directly into an lpd(8) spool directory
and wakes up lpd after accepting a job from the network to have it re-examine the
appropriate spool directory. The actual printing and spooling is handled entirely by lpd.
papd can also pipe the print job to an external program for processing, and this is the
preferred method on systems not using CUPS to avoid compatibility problems with all the
flavours of lpd in use.
As of version 2.0, CUPS is also supported. Simply using cupsautoadd as first papd.conf
entry will share all CUPS printers automagically using the PPD files configured in CUPS.
It ist still possible to overwrite these defaults by individually define printer shares.
See papd.conf(5) for details.
papd is typically started at boot time, out of system init scripts. It first reads from
its configuration file, /etc/netatalk/papd.conf. The file is in the same format as
/etc/printcap. See printcap(5) for details. The name of the entry is registered with NBP.
The following options are supported:
Name Type Default Description
pd str ´.ppd´ Pathname to PPD
file
pr str ´lp´ LPD or CUPS printer
name (or pipe to a
print
command)
op str ´operator´ Operator name for LPD
spooling
au bool false Whether to do
authenticated printing
or not
ca str NULL Pathname used for
CAP-style
authentification
sp bool false PSSP-style
authetication
am str NULL UAMS to use for
authentication
pa str NULL Printer´s AppleTalk
address
co str NULL CUPS options as
supplied to the lp(1)
command with "-o"
fo bool false adjust lineending for
foomatic-rip
If no configuration file is given, the hostname of the machine is used as the NBP name and
all options take their default value.
OPTIONS
-d
Do not fork or disassociate from the terminal. Write some debugging information to
stderr.
-f configfile
Consult configfile instead of /etc/netatalk/papd.conf for the configuration
information.
-p printcap
Consult printcap instead of /etc/printcap for LPD configuration information.
NOTES
PSSP (Print Server Security Protocol) is an authentication protocol carried out through
postscript printer queries to the print server. Using PSSP requires LaserWriter 8.6.1 or
greater on the client mac. The user will be prompted to enter their username and password
before they print. It may be necessary to re-setup the printer on each client the first
time PSSP is enabled, so that the client can figure out that authentication is required to
print. You can enable PSSP on a per-printer basis. PSSP is the recommended method of
authenticating printers as it is more robust than CAP-style authentication, described
below.
CAP-style authentication gets its name from the method the CAP (Columbia APpletalk)
package used to authenticate its mac clients´ printing. This method requires that a user
login to a file share before they print. afpd records the username in a temporary file
named after the client´s Appletalk address, and it deletes the temporary file when the
user disconnects. Therefore CAP style authentification will not work for clients connected
to afpd via TCP/IP. papd gets the username from the file with the same Appletalk address
as the machine connecting to it. CAP-style authentication will work with any mac client.
If both CAP and PSSP are enabled for a particular printer, CAP will be tried first, then
papd will fall back to PSSP.
The list of UAMs to use for authentication (specified with the ´am´ option) applies to all
printers. It is not possible to define different authentication methods on each printer.
You can specify the list of UAMS multiple times, but only the last setting will be used.
Currently only uams_guest.so and uams_clrtxt.so are supported as printer authentication
methods. The guest method requires a valid username, but not a password. The Cleartext UAM
requires both a valid username and the correct password.
Note
As of this writing, Mac OS X makes no use of PSSP authentication any longer. CAP-style
authentication normally won´t be an option, too caused by the use of AFP over TCP
these days.
FILES
/etc/netatalk/papd.conf
Default configuration file.
/etc/printcap
Printer capabilities database.
.ppd
PostScript Printer Description file. papd answers configuration and font queries from
printing clients by consulting the configured PPD file. Such files are available for
download from Adobe, Inc. (http://www.adobe.com/support/downloads/main.htm[1]), or
from the printer´s manufacturer. If no PPD file is configured, papd will return the
default answer, possibly causing the client to send excessively large jobs.
CAVEATS
papd accepts characters with the high bit set (a full 8-bits) from the clients, but some
PostScript printers (including Apple Computer´s LaserWriter family) only accept 7-bit
characters on their serial interface by default. The same applies for some printers when
they´re accessed via TCP/IP methods (remote LPR or socket). You will need to configure
your printer to accept a full 8 bits or take special precautions and convert the
printjob´s encoding (eg. by using co="protocol=BCP" when using CUPS 1.1.19 or above).
When printing clients run MacOS 10.2 or above, take care that PPDs do not make use of
*cupsFilter: comments unless the appropriate filters are installed at the client´s side,
too (remember: Starting with 10.2 Apple chose to integrate CUPS into MacOS X). For
in-depth information on how CUPS uses PPDs see chapter 3.4 in http://tinyurl.com/zbxn[2]).
SEE ALSO
lpr(1),lprm(1),printcap(5),lpc(8),lpd(8), lp(1).
NOTES
1. http://www.adobe.com/support/downloads/main.htm
http://www.adobe.com/support/downloads/main.html#Printer
2. http://tinyurl.com/zbxn
http://tinyurl.com/zbxn