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As per the role-based ACL shown in Table 1-3, a backup operator is allowed to read data from all user home directories (/home/*) so that the data can be archived. However, a principal with an administrator role, such as Alice, may be able to read, write, and execute files anywhere on the file system. Users that have multiple roles would declare their role just prior to conducting an action, such as doing a backup or modifying a file. While a user such as Bob may have both read and write privileges to some files (such as those in his home directory), the purpose of the role would be to ensure that he could not inadvertently modify a file while doing a backup. Another example might use the concept of a group in the UNIX operating system to implement RBAC. All users with a particular role would be placed in a group with the same name as their role (e.g., Alice and Bob would be members of the group programmer). To make the file /home/Alice/product_specs.txt available to all programmers, one could use the command chgrp programmer /home/Alice/product_specs.txt. As long as the file has group read privileges, all users within the programmer group will have read privileges for the file. The results of such a command are shown in Table 1-5, which contains a third row that specifies that any user with the programmer role can read the file /home/Alice/product_specs.txt. Table 1-5. The ACL Based on the RBAC Model

Notice that the method must be marked with the unsafe keyword. This creates an unsafe context which allows you to create pointers the compiler will not let you use pointers or fixed without this. In fact, it s so keen to discourage the use of unsafe code that you have to ask twice: the unsafe keyword produces compiler errors unless you also set the /unsafe compiler option. In Visual Studio, you can find this by opening the project properties and clicking the Build tab, which contains the Allow unsafe code checkbox shown in Figure 19-7.

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The test program in Example 19-3 instantiates the APIFileReader and an ASCIIEncod ing object. It passes the filename (8Swnn10.txt) to the constructor of the APIFileR eader and then creates a loop to repeatedly fill its buffer by calling the Read() method, which invokes the ReadFile API call. An array of bytes is returned, which is converted to a string using the ASCIIEncoding object s GetString() method. That string is passed to the Console.Write() method, to be displayed on the console. (As with the MoveFile example, this is obviously a scenario where in practice, you d just use the relevant managed APIs provided by the .NET Framework in the System.IO namespace. This example just illustrates the programming techniques for pointers.)

The text that it will read is a short excerpt of Swann s Way (by Marcel Proust), currently in the public domain and available for download as text from Project Gutenberg. Example 19-3. Using pointers in a C# program

using System; using System.Runtime.InteropServices; using System.Text; namespace UsingPointers { class APIFileReader { const uint GenericRead = 0x80000000; const uint OpenExisting = 3; const uint UseDefault = 0; int fileHandle; [DllImport("kernel32", SetLastError = true)] static extern unsafe int CreateFile( string filename, uint desiredAccess, uint shareMode, uint attributes, uint creationDisposition, uint flagsAndAttributes, uint templateFile); [DllImport("kernel32", SetLastError = true)] static extern unsafe bool ReadFile( int hFile, void* lpBuffer, int nBytesToRead, int* nBytesRead, int overlapped); // constructor opens an existing file // and sets the file handle member public APIFileReader(string filename) {

Listing 7-1. RSS Block Description < xml version="1.0" encoding="UTF-8" > <block class="RSSClass"> <providerName>RSS</providerName> <providerUrl>http://www.popfly.ms</providerUrl> <providerLogoUrl>/content/components/icons/rssLogo.png</providerLogoUrl> <blockIconUrl>/content/components/icons/rss.png</blockIconUrl> <description>RSS. Parse feeds into items that you can use in any mashup.</description> <suggest output="newsdisplay" input="userinput"/> <operations> <operation name="getItems" callMode="auto"> <description> Retrieves items from the specified RSS feed. </description> <inputs> <input name="url" required="true" type="feedUrl"> <description>The URL of the RSS feed</description> <defaultValue>http://blogs.msdn.com/MainFeed.aspx</defaultValue> <constraints/> </input> </inputs> <outputs> <output isArray="true" type="custom" object="RSSItem"/> </outputs> </operation> <operation name="getFeed" callMode="auto">

}

Cookies are divided into two classes with respect to how long they are cached by the browser By default, a cookie is cached by the browser until the browser is shut down We refer to such cookies as temporary or non-persistent cookies4 Web servers have the option to annotate cookies sent to a browser with an explicit expiry date Such cookies persist until the indicated expiry time, even across restarts of the browser or reboots of the operating system, and are thus called persistent cookies In popular browser implementations, when the user opens an additional browser window or tab from within an already open browser, the new window reflects the same cookie state (ie, a request made to the same URL in either window would send the exact same set of cached cookies to the server).

fileHandle = CreateFile( filename, // filename GenericRead, // desiredAccess UseDefault, // shareMode UseDefault, // attributes OpenExisting, // creationDisposition UseDefault, // flagsAndAttributes UseDefault); // templateFile

}

public unsafe int Read(byte[] buffer, int index, int count) { int bytesRead = 0; fixed (byte* bytePointer = buffer) { ReadFile( fileHandle, // hfile bytePointer + index, // lpBuffer count, // nBytesToRead &bytesRead, // nBytesRead 0); // overlapped } return bytesRead; }

class Test { public static void Main() { // create an instance of the APIFileReader, // pass in the name of an existing file APIFileReader fileReader = new APIFileReader("8Swnn10.txt"); // create a buffer and an ASCII coder const int BuffSize = 128; byte[] buffer = new byte[BuffSize]; ASCIIEncoding asciiEncoder = new ASCIIEncoding(); // read the file into the buffer and display to console while (fileReader.Read(buffer, 0, BuffSize) != 0) { Console.Write("{0}", asciiEncoder.GetString(buffer)); }

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