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A special DEFAULT rule is designed to match any request. You can then specify the default action to take. The following entry accepts any request. A REJECT action would reject any request.
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The lpd.perms file consists of a set of rules that are sequentially evaluated until a match is found. The DEFAULT action rule should be the last rule and is normally one to accept any requests. In other words, any request that is not matched by the previous rules is accepted. Normally you would set up rules to reject certain requests, like requests for specific hosts. Most requests would not match these rules and then should fall through to the DEFAULT action, which would ACCEPT them.
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SERVICE key values differ depending on type of request submitted. These can range from a simple connection request by a remote server to a removal of a print job. The print clients like lpr, lpq, lprm, and lpc will make different kinds of service requests. lpq will make a request for queue information that has the key value Q for SERVICE. lprm will issue a removal request indicated by a key value M. The different service values for the SERVICE key are shown here: Key Value X R P Q M C S Service Requests Connection request Job spool Printing Queue status information (lpq) Removal request (lprm) Printer control (lpc) Printer status (lpc)
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A further distinction is made between keys that reference information in a print job's control file and that provided by a print command like lpc or lpq. For example, the HOST key references hostnames in a print job's control file, allowing you to reject or accept print job requests. The REMOTEHOST key will reference hostnames derived from the remote connection directly for all types of requests except for an lpr request. Check the key table in the lpd.perm or lpd Man page for a detailed breakdown of requests and the type of information they reference. As another example, SAMEUSER will match the user indicated in a print request for a print job, such as status or removal, against the user in the control file for that print job, to make sure they are the same user. The settings for the /etc/lpd.perms file included with Red Hat are shown here. The file itself includes details documentation as well as several commented recommended entries.
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# allow root on server to control jobs ACCEPT SERVICE=C SERVER REMOTEUSER=root # allow anybody to get server, status, and printcap ACCEPT SERVICE=C LPC=lpd,status,printcap # reject all others REJECT SERVICE=C # # allow same user on originating host to remove a job ACCEPT SERVICE=M SAMEHOST SAMEUSER # allow root on server to remove a job ACCEPT SERVICE=M SERVER REMOTEUSER=root REJECT SERVICE=M # all other operations allowed DEFAULT ACCEPT
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The Print Queue Clients
As noted previously, printing on your system is handled by a print daemon called lpd, which is constantly running, waiting for print jobs and then managing their printing procedures. The lpd daemon places its print jobs on print queues. Once on the queue, there are several clients you can use to manage print jobs such as lpq, which lists a print queue, lpc, which can reorder
it, and lprm, which can remove a print job, effectively canceling it. Documents are initially submitted to lpd with the lpr print command. The lpr client submits a job, and lpd then takes it in turn and places it on the appropriate print queue. lpr takes as its argument the name of a file. You can also feed data to lpr through the standard input, piping in the data to be printed from another operation. The -P option enables you to specify a particular printer. In the next example, the user first prints the file preface. Then he or she uses the cat command to generate combined output of the files intro and digest. This is piped to the lpr command, which then prints it. Finally, the user prints the file report to the printer with the name myepson.
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