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The key to preventing replay attacks is for the Web service to verify the uniqueness of incoming request messages. The WS-Addressing specification describes a GUID-based message ID that is one of several addressing headers that can be assigned to a SOAP message. WSE provides support for the WS-Addressing specification in general, and for addressing headers specifically. Once again, the burden is on the Web service to store message correlation information and to determine whether an incoming message has already been received. As with other kinds of identifiers, the message ID does not in and of itself prevent replay attacks, but it provides another simple, unique identifier for an incoming SOAP message. Another type of message identifier is the sequence number, which stamps a message with the sequential role that it plays in a business process. Sequence numbers are part of the WSReliable Messaging specification and are designed to enable business orchestration, which refers to a business process or workflow that spans multiple components. In SOAs, sequenced messages are exchanged between multiple Web services, and the collective outcome represents the completion of the business workflow.

The -v switch is a relatively new option for assigning a variable, and it may not be ideal when you re shooting for portability. In that case, this usage should do the trick:

How to build message-oriented and service-oriented Web services Web Services Enhancements (WSE) 2.0 Solution developers and architects alike will find a lot in this book to hold their interest. The material in the book provides detailed conceptual discussions on service-oriented architecture combined with in-depth C# code samples. The book avoids rehashing familiar concepts, and focuses instead on how to rethink your approach to Web services development using today s best tools and industrystandard specifications. The book was written using prerelease copies of WSE that were released after the Tech Preview, so you have the benefit of the latest and greatest developments with WSE.

It produces the following output:

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Sequence numbers provide an additional advantage for preventing replay attacks because a message that contains a duplicate sequence number is automatically suspect. Sequence numbers alone do not ensure uniqueness, but they will in conjunction with a message ID.

This book covers service-oriented architecture and cutting-edge Web services development using the WS-Specifications and Web Services Enhancements 2.0. The first half of the book shows you how to think in terms of messages rather than procedure calls. It shows you how to design and build message- and service-oriented Web services that provide the security and the functionality that companies and businesses will require before they are ready to widely adopt Web services technology. The second half of the book focuses on WSE 2.0, which provides infrastructure and developer support for implementing industry-standard Web service specifications, including WS-Security: A wide-ranging specification that integrates a set of popular security technologies, including digital signing and encryption based on security tokens, including X.509 certificates. WS-Policy: Allows Web services to document their requirements, preferences, and capabilities for a range of factors, though mostly focused on security. For example, a Web service policy will include its security requirements, such as encryption and digital signing based on an X.509 certificate. WS-Addressing: Identifies service endpoints in a message and allows for these endpoints to remain updated as the message is passed along through two or more services. It largely replaces the earlier WS-Routing specification. WS-Messaging: Provides support for alternate transport channel protocols besides HTTP, including TCP. It simplifies the development of messaging applications, including asynchronous applications that communicate using SOAP over HTTP.

Here is another use of shell variables with the awk command. The NODE=$node assignment sets the internal awk variable NODE to the value of the shell variable $node. The awk command then checks whether each line of the input file for $2 is equal to the value of NODE. If a line is equal, then $3 is output. In this example, the /etc/hosts file was used. The code works like that in the Simple Pattern-Matching example shown earlier, except that the value to compare against can be specified independently of the field that is output.

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The output depends on the contents of your /etc/hosts file, but the intended effect is to display the domain name corresponding to the specified node name. Try setting the node variable to the name of your system before running this command. My system is named casper and this is its hosts file entry:

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