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PCNFSD(8)                                               PCNFSD(8)

       pcnfsd - (PC)NFS authentication and print request server


       This program probably contains 5 to 6 security holes in it
       (it has been diagnosed to have a few, but  they  were  not
       yet been fixed).  Use it at your own risk.

       pcnfsd  is  an RPC server that supports Sun ONC clients on
       PC (DOS, OS/2, Macintosh, and other)  systems.  This  page
       describes version two of the pcnfsd server.

       rpc.pcnfsd  may  be  started  from /etc/rc.local or by the
       inetd(8) superdaemon.  It  reads  the  configuration  file
       /etc/pcnfsd.conf   if   present,  and  then  services  RPC
       requests directed to program number 150001.  This  release
       of the pcnfsd daemon supports both version 1 and version 2
       of the pcnfsd protocol. Consult  the  rpcgen  source  file
       pcnfsd.x for details of the protocols.

       The  requests  serviced  by  pcnfsd  fall into three cate-
       gories: authentication,  printing,  and  other.  Only  the
       authentication  and  printing services have administrative

       When  pcnfsd  receives  a  PCNFSD_AUTH   or   PCNFSD2_AUTH
       request, it will "log in" the user by validating the user-
       name and password and  returning  the  corresponding  uid,
       gids,  home directory, and umask. If pcnfsd was built with
       the WTMP compile-time option, it will also append a record
       to  the  wtmp(5) database. If you do not wish to record PC
       "logins" in this way, you should add a line of the form

              wtmp off

       to the /etc/pcnfsd.conf file.

       pcnfsd supports a printing model based on the use  of  NFS
       to  transfer  the actual print data from the client to the
       server. The client system issues a PCNFSD_PR_INIT or  PCN-
       FSD2_PR_INIT request, and the server returns the path to a
       spool directory which the client  may  use  and  which  is
       exported  by  NFS.  pcnfsd creates a subdirectory for each
       of  its  clients:  the  parent   directory   is   normally
       /export/pcnfs  and the subdirectory is the hostname of the
       client system.  If you wish  to  use  a  different  parent
       directory, you should add a line of the form

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PCNFSD(8)                                               PCNFSD(8)

              spooldir path

       to the /etc/pcnfsd.conf file.

       Once  a  client  has mounted the spool directory using NFS
       and has transferred print data to a file  in  this  direc-
       tory,  it will issue a PCNFSD_PR_START or PCNFSD2_PR_START
       request.  pcnfsd  handles  this,  and  most  other  print-
       related  requests,  by constructing a command based on the
       printing services of the server operating system and  exe-
       cuting  the  command  using  the  identity of the PC user.
       Since this involves set-user-ID privileges, pcnfsd must be
       run as root.

       Every  print  request from the client includes the name of
       the printer which is to be used. In SunOS, this name  cor-
       responds  to  a printer definition in the /etc/printcap(5)
       database. If you wish to define a non-standard way of pro-
       cessing  print  data,  you should define a new printer and
       arrange for the client to print to this printer. There are
       two  ways of setting up a new printer.  The first involves
       the addition of an entry to /etc/printcap(5) and the  cre-
       ation  of filters to perform the required processing. This
       is outside the scope of this discussion. In addition, pcn-
       fsd  includes a mechanism by which  you can define virtual
       printers known only to pcnfsd  clients.  Each  printer  is
       defined by a line in the /etc/pcnfsd.conf file of the fol-
       lowing form

              printer name alias-for command

       name is the name of the printer you want to define. alias-
       for  is  the name of a "real" printer which corresponds to
       this printer. For example, a request to display the  queue
       for name will be translated into the corresponding request
       for the printer alias-for. If you have defined  a  printer
       in  such a way that there is no "real" printer to which it
       corresponds, use a single "-" for  this  field.  (See  the
       definition of the printer test below for an example.) com-
       mand is a command which will be executed whenever  a  file
       is  printed  on  name.   This  command  is executed by the
       Bourne shell, /bin/sh using the  -c  option.  For  complex
       operations  you  should construct an executable shell pro-
       gram and invoke that in command.  Within command the  fol-
       lowing tokens will be replaced:

       Token     Substitution

       $FILE     Replaced by the full path name of the print data
                 file. When the command has  been  executed,  the
                 file will be unlinked.

       $USER     Replaced  by  the username of the user logged in

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PCNFSD(8)                                               PCNFSD(8)

                 to the client system.

       $HOST     Replaced by the host name of the client  system.

       Consider the following example /etc/pcnfsd.conf file:

              printer   rotated  lw  /usr/local/bin/enscript  -2r
              printer     test      -      /usr/bin/cp      $FILE

       If a client system prints a job on the printer rotated the
       utility enscript will be invoked to pre-process  the  file
       $FILE.  In this case, the -2r option causes the file to be
       printed  in  two-column  rotated  format  on  the  default
       PostScript(R)  printer.   If the client requests a list of
       the print queue for the printer rotated the pcnfsd  daemon
       will  translate  this into a request for a listing for the
       printer lw.

       The printer test is used only for testing. Any  file  sent
       to this printer will be copied into /usr/tmp.  Any request
       to list the queue, check the status, etc. of printer  test
       will  be rejected because the alias-for has been specified
       as "-".

       /etc/pcnfsd.conf    configuration file
       /export/pcnfs       default print spool directory

       lpr(1), lpc(8)

       The pcnfsd source code is distributed by Sun Microsystems,
       Inc.  with  their  PC/NFS product under terms described in
       common.h in that source code.  Those  terms  require  that
       you  be  informed that this version of pcnfsd was modified
       to run on and is NOT supported by Sun.

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