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An available system is one that can respond to its users requests in a reasonable timeframe While availability is typically thought of as a performance goal, it can also be thought of as a security goal If an attacker is able to make a system unavailable, a company may lose its ability to earn revenue For example, if an online bookstore s web site is attacked, and legitimate customers are unable to make purchases, the company will lose revenue An attacker that is interested in reducing the availability of a system typically launches a denial-of-service (DoS) attack If the online bookstore web site were run on a single web server, and an attacker transmitted data to the web server to cause it to crash, it would result in a DoS attack in which legitimate customers would be unable to make purchases until the web server was started again.

Before you can begin programming, you must install GTK+ and its dependencies on your system This section covers installing GTK+ on Linux and other UNIX-like operating systems It is important to note, if you are using a Linux distribution with a package manager including Ubuntu, Debian, Fedora Core, or one of many others, you should install the precompiled binaries provided You will need the GTK+ 2 libraries, pkg-config, and their dependencies The development packages of GTK+ and each of its dependencies are also required In Debian and Debian-based distributions, these packages will end in -dev In Fedora Core and other distributions that use the RedHat Package Manager (RPM), they will end in -devel If you install the development package of GTK+, most modern package managers will take care of all of the necessary dependencies automatically You should reference your Linux distribution s documentation for more information on installing distributed packages.

Figure 23.2 The onion architecture uses the concept of an application core that doesn t depend on external libraries, such as NHibernate.

If you are going to install GTK+ and its dependencies from the source archives, the rest of this section is for you GTK+ uses the standard GNU tools for compiling: autoconf is used for configuration and dealing with portability issues, automake for building makefiles, libtool for building shared libraries, and make for compiling and installing binaries The most recent GTK+ sources can be found at wwwgtkorg/download You will need to download the latest versions of ATK, GLib, GTK+, and Pango You will also need Cairo, JPEG, libpng, pkg-config, and tiff from the dependencies directory If you are using an older version of Linux, you will need to install libiconv Most systems already have this package, so it is safe to continue without it and install the library in the future if you run into any problems.

Most web sites are not run using just a single web server, but even multiple web servers running a web site can be vulnerable to an attack against availability In a distributed denial-of-service (DDoS) attack, perpetrators commandeer weakly protected personal computers and install malicious software (malware) on them that sends excessive amounts of network traffic to the victim web sites5 The servers running the victim web sites are then overwhelmed with the large number of packets arriving from the commandeered computers, and are unable to respond to legitimate users In February 2000, the eBay, E*TRADE, Amazon, CNN, and Yahoo web sites were victims of DDoS attacks, and some were disabled for almost an entire business day This meant lost revenues and interruption of service for legitimate users.

The solution structure implements the decoupling strategy that the onion architecture requires. In figure 23.3, you can see this structure with the Core project s references expanded. The application has a simple core, and the libraries referenced to implement the core are straightforward. Notice that there s no reference to NHibernate.dll from the Core project. It s important that the core remain portable and not coupled to external libraries that will change over time. As time goes on, the libraries you use will change, as will the versions of the libraries. Keeping the core free from this churn will keep it stable. As with everything

You may also need to install libintl, fontconfig, and FreeType, although these are packages provided as standard on most modern Linux distributions You should also note that these packages must be installed in a precise order for the following procedure to work After installing all of the packages from the dependencies directory on the GTK+ FTP site, you will need to install GLib, Pango, ATK, and GTK+ in that specific order The following procedure should be used on each source package, one at a time Each library must be successfully installed before continuing on to the next, or the procedure will not work You are now ready to install GTK+, so let s begin Once you have downloaded a package from the GTK+ FTP site, you can use one of the following commands to extract the file, depending on the type of archive you downloaded tar xvzf package-nametar.