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Samba provides a simple mechanism for making all the printers identified in the UNIX printer configuration file available for use. The [printers] share is a special smb.conf section similar to the [homes] share discussed in 11. When an SMB connection setup request is received by the server, Samba first scans smb.conf, attempting to match the request to one of the specifically named shares. If a match is not found, it will then scan the passwd database, attempting to locate a match based on the client user name. If no match is found and a [printers] share is defined in the configuration file, it will then scan the UNIX printer configuration file to find a match. If a printer name match is found, Samba grants access to a temporary [printer name] share created by cloning the [printers] section definitions. A sample [printers] share is listed in Example 12.1. Example 12.1 Sample [printers] Share [printers] path = /var/spool/samba writeable = no guest ok = yes printable = yes
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Share Level Parameters
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Samba provides a set of additional share parameters that allow you further to tailor the behavior of individual print shares (Table 12.1). Most of these parameters involve specifying command scripts that will be used to query and manage the local UNIX print queues from Windows and LAN Manager clients. Default values are supplied for some of the command parameters based on the operating system type specified by the printing parameter. Table 12.1 Print Share Parameters
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Print file handling command or script. Use %s or %f.
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Query print queue. User %p (printer). How long lpq info is cached; limits server load from repeated query requests from Windows clients. Default is 10 seconds. The Windows spool manager on each client will query a remote print queue every 15 seconds. The cache files are stored in /tmp/lpq.xxxx where xxxx is a hash of the lpq command in use. Remove a print job from a queue. Use %p (printer) and %j (job #). Pause a specific print job. Use %p (printer) and %j (job #). Resume a specific print job. Use %p (printer) and %j (job #). Force printing in postscript mode; fixes leading ctl-d problem by adding a %! sequence to the beginning of the file before sending it to the printer. Pause a specific print queue. Use %p (printer). Resume a specific print queue. Use %p (printer)
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lprm command
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lpresume command
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queueresume command
Print Command
In particular, you'll want to verify the options specified by the print command parameter. The value of print command is a text string that will be invoked via a system() call to process a print file after the file has been written to the spool directory. In general, this will result in the file's being handed off to the printing subsystem. The print command must remove the print file from the spool directory when processing has been completed. Example 12.2 displays print command defaults for the supported operating system types. Example 12.2 Default Print Command Values print command = lpr r P%p %s print command = lp c d%p %s; rm %s print command = lp d%p s %s; rm %s AIX, BSD, LPRNG, PLP, QNX HPUX, SYSV SOFTQ
Note that the specified command must indicate the spool file name and, optionally, the printer name (Table 12.2). In addition, if guest ok is specified for the printer, some systems experience print failures if the guest account value is nobody. In this event, use an alternate UNIX account in the guest account parameter.
Command Parameter Scripts
The print command parameters listed in Table 12.1 designate a text string that
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represents any valid UNIX command or shell script combination. The parameter string value is passed to C library system() routine which then forks and executes sh (command language interpreter) to parse and execute the passed string. The command string value will likely include instances of Samba substitution variables (Table 12.2). Variable values will be resolved before passing the string to the system() routine. It is a good idea to use the full path name for any command or script in a command parameter value. This avoids problems associated resolving paths during execution. Sample command strings are listed in Example 12.3. Table 12.2 Printer Share Substitution Variables
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