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In the course of using phpBB, you will inevitably ban someone from using your site. The Ban panel, illustrated in Figure 10-11, helps you manage your lists of the banished. You have several methods at your disposal for banning users: Banning by username: This is straightforward. You simply ban the user s account by selecting his name. This is effective at shutting down an account, but the user can easily come back by registering under a different name. Banning by e-mail address/domain: You can ban specific e-mail addresses (such as or use wildcards to block whole domains (such as * This can help screen out people who use free e-mail services to open accounts, particularly if you have validation enabled. Banning by IP address/range: This is the most effective method of banning a user, but also the most dangerous, especially if you ban by range. To ban an IP address from your forum, simply enter the IP address (which you can glean from a user s post, explained in Using the IP Manager section later in this chapter) and click Submit at the bottom.
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With the June 2009 release of the iPhone SDK 3.0, support was added to include the protocol in your app s info-plist file. Figure 2 5 shows an example of a plist where you use the protocol COM.MACMEDX.P1.
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In the connection string, you specify a database that doesn t exist on the server; here you misspell Northwind as Northwnd: Dim conn As SqlConnection = New SqlConnection _ ("Data Source=.\sqlexpress;" & _ "Integrated Security=True;" & _ "database=northwnd") When you try to open the connection, an exception of type SqlException is thrown and you loop through the items of the Errors collection and get each Error object using its indexer: Catch ex As System.Data.SqlClient.SqlException Dim str As String Dim i As Integer For i = 0 To ex.Errors.Count - 1 Step i + 1 str += ControlChars.NewLine & "Index #".ToString & i & _ ControlChars.NewLine & _ "Exception: " & ex.Errors(i).ToString() & ControlChars.NewLine & _ "Number: " & ex.Errors(i).Number.ToString() & ControlChars.NewLine Next MessageBox.Show(str, "Database Exception") This example shows that the SqlException object carries detailed information about every SQL error in its Errors collection.
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Overview of RSS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239 Walking Through an Example RSS File . . . . . . . . . . . . . . . . . . . . . . . . . . 240 RSS Browsers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 246 Displaying Syndicated Information in Portlets . . . . . . . . . . . . . . . . 247 Syndicating Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253
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damage is pretty high; the system will be compromised. Sadly, code signing in OS X doesn t currently prevent such an attack. It detects the attack, which permits quick reaction on the part of whoever notices the detection. Detection and reaction are important though often overlooked factors of a good security posture. Novel attacks are always being found, or you may have just overlooked an important risk: the only way you ll find out is if you have some detection in place. Application signing can potentially be utilized to defend against such occurrences with its ability to confidently validate integrity. When an application is signed, that signature uniquely identifies the executable code of the application, providing a unique fingerprint. If the application s code is altered, that fingerprint changes unequivocally, and the digital signature will have been broken. Code signing provides an additional benefit for application integrity: when an application runs, its contents are copied to memory and then executed. In the traditional sense, code signing provides the ability for an operating system to detect on-disk modifications to an application. But in actuality, it goes even further than that. Apple s code signing system actually provides the functionality to dynamically verify the validity of code running in a given process. This facility helps to verify integrity of the application on the disk and while running. Even if an application loads new code like a plug-in after it has started, code signing can detect that and update its view of the application s integrity.
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As a rule of thumb, top-level variables and static fields belong to the first class, function arguments and local variables belong to the second class, and memory explicitly allocated using the new operator belongs to the last class. The code generated by the JIT compiler uses different data structures to manage memory and automatically interacts with the operating system to request and release memory during program execution. Each execution thread has a stack where local variables and arguments are allocated when a function or method is invoked (see Figure 17-2). A stack is used because it naturally follows the execution flow of method and function calls. The topmost record contains data about the currently executing function; below that is the record of the caller of the function, which sits on top of another record of its caller, and so on. These activation records are memory blocks used to hold the memory required during the execution of the function and are naturally freed at the end of its execution by popping the record off the stack. The stack data structure is used to implement the automatic memory of the program; and because different threads execute different functions at the same time, a separate stack is assigned to each of them.
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For an example of how you use protocolStrings, take a look at the following code snippet.
It may also be desirable to send log messages to syslog. This provides the added benefit of time-stamping output, and provides you with the ability to integrate your script logging with a more complex syslog system, should your organization employ one. To send messages to syslog, use the logger command:
(or Zero Configuration Networking) system, just like Microsoft Windows systems. (Microsoft refers to this as Automatic Private IP Addressing, but it s also known as link-local.) In other words, if a bunch of computers plug into a hub or router on an ad hoc basis, without being configured and without a DHCP server operating, they will be able to network with each other. To make this work, each computer randomly assigns itself a unique IP address that starts with 169.254 with a subnet mask of
by Charlie Schulze
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