Bug 219064

Description of problem:
Neither printer nor file sharing work as configured.
The existing nxnode and nxclient scripts have multiple bugs in them.

By hacking around I was able to get printer sharing working (and even added some
new functionality that filled previous holes).

I was not able to get file sharing working seamlessly since Fedora Core now uses
mount.cifs (which uses port 445 [SMB]) rather than smbmount (which uses port 139
[NBSS]). Therefore, while I could relatively easily fix the scripts, you still
would need to manually do the port forwarding from the client side since I don't
have the source for the Windows NX client. I will, however, show how to do it
manually below.

--------------------------------------------
Bugs, fixes, and improvements for printer sharing: (working, corrected versions
are attached below:

NXNODE:
- BUG: Old cupsd processes tied to old sessions were left running which was not
only messy but also blocked the port forwarding, preventing new sessions from
establishing properly
  SOLUTION: Added code in node_terminate_session to also kill the cupsd process
associated with the terminated session

- BUG: Stripped down cupsd.conf means that the system default policy is used
which requires authentication to add/drop printers or even set a default
printer. Also, several of the directories were not referenced properly or created.

- SOLUTION: Rewrote the cupsd.conf based on /etc/cups/cupsd.conf and its default
security policy.
   ** $USER added to SystemGroup
   ** Proper paths given for Access, Error, and Page logs
   ** CacheDir and StateDir added (and .nx/C-$sess_id/cups/cache directory created)
   ** Switched to single 'Listen' directive rather than separate 'Port' and
'Server Name' directives
   ** Access restrictions added from /etc/cups/cupsd.conf
   ** Default policy from /etc/cups/cupsd.conf modified to allow Add, Delete,
and Default printer without (password) authentication

- BUG: pstoraster.convs needs to be in .nx/C-$sess_id/cups/
  SOLUTION: Fixed

- BUG: Device URI for smb can't use localhost but instead needs to reference
127.0.0.1 for proper netbios name resolution.
  SOLUTION: Fixed

- ENHANCEMENT: Added 'guest' to allowed users so that you can print test pages
from the CUPS web interface

- BUG: IPP_PORT environment variable no longer used for storing server name
  SOLUTION: Substituted '-h localhost:$IPP_PORT' format

NXCLIENT:
- BUGS: 'break' in the parsing option line for '--printer' means that the
'display' variable may not get parsed (and indeed doesn't)
  SOLUTION: Removed 'break'

- BUGS: xdialog not part of Fedora Core 6 (or any of the major repos) and
xmessage buttons don't work if you have more than a few printer ppd choices 
- SOLUTION: Added support for 'dialog' (which is part of Fedora core) launched
in an xterm.

- ENHANCEMENT: In the original implementation, utility_printer re-parses all the
ppd files every time it looks up a vendor or a model. This becomes exceedingly
slow when there are a large number of vendors and ppd files (as when using
foomatic drivers). Instead, changed functionality to only parse through ppd
files once and cache the vendor and model lists in ~/.nx/config/drivers.cache.all

NXPRINT:
- ENHANCEMENT: Original implementation only queried the 3 (non-zipped) ppd files
in /usr/share/cups/model. Added support for gzipped drivers and for parsing the
1500+ foomatic drivers.

- BUG: 'nxprint --printers' prints out the system cupsd queue rather than the
local cupsd queue
  SOLUTION: Fixed by adding "-h localhost:port" code


---------------------------------
MOUNTING remote smb shares over (nx)ssh...
1. As mentioned above, mount.cifs uses port 445 rather than port 139. So, first
add remote port forwarding from the client machine, e.g.,

   ssh <remoteserver> -R 12001:localhost:445

2. On the remote server run: (as superuser)

   mount.cifs //127.0.0.1/<client share> /mnt/<mount name> -o
username=<usrname>,ip=127.0.0.1,port=12001

..then enter password when prompted