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LPRng allows you to configure your lpd server, setting global defaults or controlling printer access. There are only two configuration files to manage, and both are heavily commented. Your distribution will normally provide basic versions for both. An extensive set of features are available, letting you create servers with powerful and complex capabilities.
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The general configuration for the lpd print server is handled in the /etc/lpd.conf file. Here, you can specify features that apply to all printers and print management. You should think of these more as default features, as any of them can be overridden in a printer s printcap entry. The lpd.conf file installed with LPRng contains an extensive list of configuration parameters. They are all commented out, prefixed with # signs. Each parameter is preceded by a comment describing the parameter. The entry itself lists the default value given to the parameters, preceding the entry with the term default. The entry for the connect_timeout parameter is shown here: # Purpose: connection timeout for remote printers # default connect_timeout=10 (INTEGER) To create your own timeout entry, it is best to add your own entry below, as shown here. Notice that the preceding # and the term default are missing from the new entry. The connection timeout for remote printers is now set at 20. This can be overridden by a printer s printcap file entry. # Purpose: connection timeout for remote printers # default connect_timeout=10 (INTEGER) connect_timeout=20 Parameters can also be flags that you can turn on or off. An off flag is noted with an attached @ sign. In the following example, the allow_user_logging parameter
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is a flag that allows users to request login information. By default, it is turned off. The following example turns it on:
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# Purpose: allow users to request logging info using lpr -mhost%port # default allow_user_logging@ (FLAG off) allow_user_logging
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LPRng provides access control rules for controlling how remote users access your print server, and thereby the printers it controls. These rules are placed in the lpd.perms file and can be used to refuse print services to specific hosts or users. Such rules consist of an action and a set of keys. The keys specify criteria to be met, and if they are met, their associated action is taken. In each rule, you have one action and one or more keys. If there are several keys, all their criteria must be met for the action to take place. An example of a key would be to specify the IP address of a host. In addition, you have to specify the kind of service that is being requested, such as a printing or connection request. The action is usually either ACCEPT or REJECT. Keys operate as flags or variables. To specify a host, you assign the address to the HOST key, using an assignment operator. For a user, you use USER, and for IP addresses, IFIP. The kind of service is specified by the SERVICE key. For a printing request, the value you assign is the lpd code P. The following example specifies a host as the key and will REJECT any request from that address: REJECT SERVICE=P HOST=192.168.0.57 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, such as requests for specific hosts. Most requests would not match these rules and should fall through to the DEFAULT action, which would ACCEPT them.
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