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Now that we have written the code and defined the block in a block definition file, we are ready to return to Popfly to test the code in a mashup. It will also give us an opportunity to explore block development using Popfly s block creator.

The additional two lines of output look like this:

64 36

Internet ports are used to route messages to applications on hosts, using, for instance, Transmission Control Protocol (TCP) By convention, applications of different types communicate over different ports For instance, web browsers typically communicate with web servers over port 80, and mail clients send outbound e-mails to mail servers on port 25 (A listing of standard port assignments can be found at wwwianaorg/assignments/port-numbers) However, port assignments are by convention only, and there is no fundamental reason that a web client couldn t connect to a web server listening on port 25, or that a mail server couldn t be run on port 80 Hence, firewalls sometimes cannot effectively control or restrict traffic successfully by just imposing rules on what port numbers applications can use to communicate Malicious hosts can easily lie about source addresses in IP packets.

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We ve gone from a capacity of 16 to 32 to 64 characters. OK; can you guess what happens if we append another 30 characters (to push ourselves over the 64-character limit) as Example 10-68 does

builder1.Append('C', 30); Console.WriteLine(builder1.Capacity); Console.WriteLine(builder1.Length);

Yup, the last two lines of output now read:

128 66

There is a geometric progression the capacity is doubling each time we exceed its previous capacity. It does this in an attempt to minimize the amount of allocation it has to do, but in order to prevent things from getting totally out of hand, overallocation will never grow the capacity by more than 8,000 characters (in the current version of the framework, at least). Of course, if you append a string that is longer than 8,000 characters, StringBuilder will have to allocate enough space, but it won t overallocate in that case.

By taking advantage of low-level networking routines, an attacker can write code that fills in the source IP address field in outgoing IP packets instead of letting the operating system do it Let Mallory (M) be a malicious host Host M could, for instance, put host A s IP address on the data packet that it sends to B When host B looks at the data packet, it will look like it came from A One can imagine that this capability can be used for nefarious purposes Consider a scenario in which host B is storing all of Alice s files on its hard disk, and Alice issues commands to add, remove, and delete files every now and then from host A Host B might even be configured to only process commands in data packets that have A s address as the source address.

You may have noticed that in the preceding examples, the String Builder had to reallocate each time we called Append. How is that any better than just appending strings Well, it isn t, but that s only because we deliberately contrived the examples to show what happens when you exceed the capacity. You won t usually see such optimally bad behavior in practice, you ll see fewer allocations than appends.

If we know we re going to need a particular amount of space, we can manually ensure that the builder has appropriate capacity, as shown in Example 10-69.

builder1.EnsureCapacity(32000); Console.WriteLine(builder1.Capacity); Console.WriteLine(builder1.Length);

Summary

The last two lines of output indicate that it has complied with our wishes:

The practice of deciding to accept communications from another host based on the host s IP address is often called IP whitelisting2 Host B is said to store a whitelist, which is simply a list of IP addresses from which it will accept data packets Unfortunately, our malicious host M may be able to coerce host B into executing commands of its choice simply by putting host A s address on the envelope When an Internet host intentionally mislabels the source address on data packets that it sends out, it is said to be conducting an IP spoofing attack IP whitelisting, as a security mechanism, is potentially susceptible to IP spoofing attacks, especially when non-connection-oriented protocols such as UDP are used Host B will send the results of the commands it executes to the host specified as the source address.

32000 66

There are around 50 standard LINQ operators. The rest of this chapter describes the most important operators, broken down by the main areas of functionality. We ll show how to use them both from a query expression (where possible) and with an explicit method call.

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