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Figure 10-6. Part of the result of joining the Tournament, Entry, and Member tables (just some columns)

TCP Wrapper works with two configuration files to determine if access is allowed or not: /etc/hosts.allow and /etc/hosts.deny. The first has a list of all hosts that can access a service, and the second contains a list of hosts for which access is denied. TCP Wrapper always first reads the /etc/hosts.allow file. If the host that tries to connect is in there, access is allowed. Only if the name of the hosts is not in /etc/hosts.allow does tcpd check /etc/hosts.deny. If the host is in there, access is blocked; if it isn t, access is allowed. Access is also allowed if one of the two configuration files is empty or does not exist.

Tip You can personalize the Applications and System menus by right-clicking either and selecting Edit Menus.

This will start the Main Menu program (also accessible from the System Preferences menu). Simply check or uncheck existing entries to add or remove them from the menus, or click the New Item button to create new entries. New application entries can be created as with the launchers discussed earlier.

Caution Test before you trust that TCP Wrapper is really protecting your services. A small error in the

The virtual table resulting from Listing 10-3 has all the information we need to find the required data. The first two rows show that members 118 and 228 are women. The row for member 286 (circled) looks more promising. How do we amend the query to find the appropriate subset of rows and columns

You can modify how your menus are displayed by right-clicking on one of them and selecting the option Edit Menus. You should be aware that the configuration is the same for all the menus in your desktop, if you have more than one. You will be presented with a three-part window. To the left you will see the menu items, or categories. If you select one of those categories, its contents will be displayed in the Items section, in which you can check the items you want displayed on the menu, and uncheck those that are of no use to you. You can hide categories or individual applications. For example, select Applications in the Menus section, and uncheck the item Games. The next time you expand the Applications menu, the Games category will not be shown. But if you select the Applications Accessories menu and uncheck the item Calculator, the Accessories category will be displayed, but the Calculator won t. You can create custom direct access for your own categories or applications. Just select in the Menus section the location of your new element, and click New Menu to create a new category, or New Item to create an application launcher inside the current category. Click Close to save the changes, which will be effective immediately.

When you execute a command in a terminal window (which was and for many people still is an everyday task), output is usually produced in the form of a text stream. So the same techniques that apply to text files can be also used on this output, with a simple operation called piping. Piping is the process of sending the output of a command as the input for another command, usually a textmanipulation tool. That output is then manipulated as if it were a file. Powerful! We ll illustrate this with an example using grep. grep is a tool that takes text as its input, searches and tries to match a regular expression or piece of text, and prints the lines that contain that regular

The generic syntax of the lines that you can include in the /etc/hosts.allow and /etc/hosts.deny files is not hard to understand: daemon:host[:option : option ...] Of these, daemon is the process involved, host is the list of hosts that you want to allow or deny access to, and option is a list of options you want to include. Note that, instead of referring to a specific host or daemon, some generic keywords can be used as well. Table 9-2 summarizes these TCP Wrapper keywords. Table 9-2. TCP Wrapper Keywords