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The Sequence number field is 32 bits in length and provides the mechanism for assuring the sequentiality of the data stream The Acknowledgment number field, which is also 32 bits in length, is used to verify the receipt of data The Acknowledgment number field informs the recipient that the datagram the sender transmitted arrived at its destination Because it would be inefficient to acknowledge each datagram, a variable window is supported by the protocol In other words, returning an acknowledgment field value of seven would indicate the receipt of all data up to the seventh datagram To ensure that lost datagrams or lost acknowledgments do not place this transport protocol in an infinite waiting period, the originator will retransmit data if the originator does not receive a response within a predefined period of time The previously described use of the acknowledgment field is referred to as Positive Acknowledgment or Retransmission (PAR) PAR requires that each unit of data must be explicitly acknowledged If a unit of data is not acknowledged by the time the originator's timeout period is reached, the previous transmission is retransmitted When the acknowledgment field is in use, a flag bit referred to as the ACK flag in the code field will be set We will shortly discuss the six bits in that field The Sequence number field is of particular interest when discussing network security Many operating systems implement their TCP/IP stack in a manner that causes the sequence numbers to be predictable In other words, if a client connects to a server three times in rapid succession and watches the sequence numbers sent by the server, the numbers will follow a pattern which can be used to guess what the next sequence number will be This function is important, because an attacker can then carry out the TCP three-way handshake without actually seeing the responses from the server This type of an attack is called session hijacking and is described later in this chapter The attacker would initially use his or her real IP address to discern how the sequence numbers are incremented Then, the attacker would spoof his or her source IP address so that packets sent from his or her machine would appear to originate from a machine the server trusted The attacking machine would never receive the replies, because the return packets would be routed to the real client If the attacker can guess the sequence numbers, however, the attacker does not need to see the replies to establish a connection Once the three-way handshake is complete, the attacker can fairly easily issue application commands without seeing the response Most simple applications, such as Telnet, have predictable responses, so it is not too difficult to carry on a conversation without seeing the responses from the server Note that to make this attack work, the attacker would have to "anesthetize" the real client by performing a DoS attack Otherwise, the real client would respond to the packets sent by the server and would interfere with the attack This attack may seem difficult to complete, but there are programs on the Internet that automate this process so that anyone can accomplish this attack The only defense is to remove non-critical services on vulnerable servers or to implement some means of randomizing sequence numbers.

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Now that we ve covered the APIs we need, let s see how they can be used together to implement an XML -RPC based blog client library.

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The best way to learn a new programming technology is by using it to build something useful, and we re going to build something very useful: a complete XML RPC based blog client library you can use to add blogging capabilities to any of your programs. We ll define our blog client library as a set of interfaces that allow multiple implementations. In this chapter, we ll implement the library using a combination of the Blogger and MetaWeblog APIs. In the next chapter, we ll implement it using the new Atom protocol. Comparing the two implementations will help you understand the differences between the XML -RPC APIs and Atom. In this section, we ll develop our blog client library using C# and XML RPC.NET. In chapter 10, we ll expand the blog client interfaces to support the Atom protocol and provide Java implementations of those interfaces for both Atom protocol and the MetaWeblog API. On the book s web site, you can find those Java implementations, which use Apache XML -RPC. We start by defining the interfaces for our library.

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The Hlen field is 4 bits in length This field, which is also referred to as the Offset field, contains a value that indicates where the TCP header ends and the data field starts and is specified as a number of 32-bit words This field is required because the inclusion of options can result in a variable length header Because the minimum length of the TCP header is 20 bytes, the minimum value of the Hlen field would be five 32-bit words

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To understand the usefulness of developing a blog client library, let s put ourselves in Rangu s shoes. After Rangu adds blogging capabilities to his build scripts, other developers in his group want to do the same thing. Otto asks Rangu to do a chalk talk at lunchtime to explain blogging APIs. Rangu prepares a short presentation to explain MetaWeblog API, Blogger API, and Atom to a group of junior programmers who all want to learn how to add blogging capabilities to their programs. During his presentation, he explains the relationship between the Blogger API and MetaWeblog API, how XML -RPC encodes method calls and data types, and how Atom uses HTTP verbs to post, put, and get XML. His audience is befuddled and bewildered by the details. They don t understand why things have to be so complicated. One programmer asks, Why can t I just create a blog object and call its post method Another, Can I make my program blog to both XML -RPC based and Atom-based blog servers Rangu realizes that these programmers are about to run into an ugly learning curve two ugly learning curves, if you count Atom.

After the presentation, Rangu and Otto decide that the best way to help developers get started with blog application development is to develop an easy-to-use blog client library that abstracts away both the complexities of and the differences between the XML -RPC based APIs and the Atom protocol. So there are really two reasons we need a blog client library: 1) to make it easy to write a blog application by hiding the complexities of the blogging APIs and 2) to make it possible for our blog applications to work with either the old XML -RPC based APIs or the new Atom protocol. How easy will we make it Once we re finished, it will be possible to post a simple blog entry with title and content to a blog server via XML -RPC using just the following code:

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