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IP spoofing is much easier for non-connection-oriented protocols such as UDP than for connection-oriented protocols like TCP TCP includes a sequence number in packets that is typically used to reorder packets if they arrive from the network out of order However, if an attacker can successfully guess TCP sequence numbers, the attacker may be able to insert packets into a TCP conversation When a TCP connection is established, the operating system chooses a TCP sequence number for the first packet in the conversation If it does not do a good job choosing such a number at random, an attacker may be able to predict the next sequence number that will be used, and can use that information to set up a spoofed TCP connection If you have further interest in IP spoofing, you can read more about it in Robert Morris s paper, A Weakness in the 4.

This is equivalent to the following query:

var longEvents = from ev in events orderby ev.StartTime where ev.Duration > TimeSpan.FromHours(2) select ev;

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You can customize the comparison mechanism used to sort the items by using an overload that accepts a comparison object it must implement IComparer<TKey> where TKey is the type returned by the ordering expression. So in these examples, it would need to be an IComparer<DateTimeOffset>, since that s the type of the StartTime property we re using to order the data. There s not a lot of scope for discussion about what order dates come in, so this is not a useful example for plugging in an alternate comparison. However, string comparisons do vary a lot different languages have different ideas about what order letters come in, particularly when it comes to letters with accents. The .NET Framework class library offers a StringComparer class that can provide an IComparer<string> implementation for any language and culture supported in .NET. The following example uses this in conjunction with an overload of the OrderBy operator to sort the events by their title, using a string sorting order appropriate for the French-speaking Canadian culture, and configured for case insensitivity:

CultureInfo cult = new CultureInfo("fr-CA"); // 2nd argument is true for case insensitivity StringComparer comp = StringComparer.Create(cult, true); var eventsByTitle = events.OrderBy(ev => ev.Title, comp);

There is no equivalent query expression if you want to use anything other than the default comparison for a type, you must use this overload of the OrderBy operator.

2BSD UNIX TCP/IP Software (Morris 1985) or the more recent article from Phrack magazine entitled IP Spoofing Demystified (daemon9, route, and infinity 1996)..

This is very similar to IComparable<T>, introduced in the preceding chapter. But while objects that implement IComparable<T> can themselves be compared with other objects of type T, an IComparer<T> compares two objects of type T the objects being compared are separate from the comparer.

The OrderBy operator method always sorts in ascending order. To sort in descending order, there s an OrderByDescending operator. If you want to use multiple sort criteria, as in Example 8-13, a different operator comes into play: you need to use either ThenBy or ThenByDescending. This is because the OrderBy and OrderByDescending operators discard the order of incoming elements and impose the specified order from scratch that s the whole point of those operators. Refining an ordering by adding further sort criteria is a different kind of operation, hence the different operators. So the method-based equivalent of Example 8-13 would look like this:

var eventsByStartTime = events.OrderBy(ev => ev.StartTime). ThenBy(ev => ev.Duration);

Ordering will cause LINQ to Objects to iterate through the whole source collection before returning any elements it can only sort items once it has seen all of the items.

Sometimes you ll end up wanting to combine two sequences of values into one. LINQ provides a very straightforward operator for this: Concat. There is no equivalent in the query expression syntax. If you wanted to combine two lists of events into one, you would use the code in Example 8-14.

There is sometimes a natural trade-off between security and convenience. We discuss this trade-off more in Section 2.3, but we ll briefly point out that the adoption of IP is an example of it here. IP was very convenient to deploy, and, partially as a result, it received wide adoption. On the other hand, if it were more secure but less convenient to deploy, it may not have been adopted as quickly or as widely. A protocol called IPsec was developed to require hosts to authenticate each other so that they cannot lie about their IP address or identity. Unfortunately, IPsec is not widely deployed on the public Internet.3

Hover the mouse over the RSS block to see additional information, including the block s description and author. In this case, the author is Microsoft. If we were in the mashup creator, double-clicking or dragging and dropping the RSS block would create a new block. In the Block Creator, double-clicking the RSS block copies, or rips, the code from the RSS block into both editors. Double-click the RSS block; your Block Creator will show the code ripped from the RSS block, as in Figure 10-3.

var allEvents = existingEvents.Concat(newEvents);

Note that this does not modify the inputs. This builds a new enumeration object that returns all the elements from existingEvents, followed by all the elements from newEvents. So this can be safer than the List<T>.AddRange method shown in 7, because this doesn t modify anything. (Conversely, if you were expecting Example 8-14 to modify existingEvents, you will be disappointed.)

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