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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 (e.g. 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
Netatalk 2.2 06 September 2004 PAPD(8)