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Communicating via Sockets
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While most applications will use either the service proxy or one of the classes for downloading via HTTP/HTTPS, some applications will need a raw communication channel. Performance is the chief reason for using sockets for communication, since less data is sent between the client and server, but there s also the potential for needing to interoperate with existing systems that communicate via sockets. Silverlight places severe restrictions on socket communication, and just like communicating over HTTP, a client access policy file must be obtained.
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Controlling Client Access via a Socket Policy Server
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Since there is no web server that Silverlight can automatically obtain the client access policy from, this policy file must be supplied by some other means. This other means is a socket policy server listening on port 943, located on the same machine that the Silverlight application will use to communicate via sockets. The details of the socket policy server are straightforward. It listens on TCP port 943 and waits for a connection. If it receives the string <policy-file-request/> from the client, it sends the contents of the clientaccesspolicy.xml file back to the Silverlight application. The details of the client access policy were shown earlier in this chapter, but as a refresher, this file looks like the following for sockets: < xml version="1.0" encoding="utf-8" > <access-policy> <cross-domain-access> <policy> <allow-from> <domain uri="*"/> </allow-from> <grant-to> <socket-resource port="4502-4534" protocol="tcp"/> </grant-to> </policy>
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CHAPTER 5 NETWORK COMMUNICATION
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</cross-domain-access> </access-policy> As shown, Silverlight supports a full valid range (from 4502 to 4534) of ports with the use of the TCP protocol. Based on the settings of the domain element, the communication can be made between the same domains, all domains, or specific domains. Further details are provided in the Enabling CrossDomain Communication section of this chapter.
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The System.Net Namespace
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The System.Net namespace provides a programming interface for the network communication using different protocols. Several key classes are used in the course of communicating over sockets. The System.Net.Sockets.Socket class contains the core functionality for socket communication. The System.Net.Sockets.SocketAsyncEventArgs class is used to pass parameters to a socket operation and also to handle the result of a socket operation, such as receiving data. The System.Net.DnsEndPoint class specifies an endpoint as a combination of a hostname and port number, while System.Net.IPEndPoint specifies the endpoint as an IP address and port number. An endpoint must be specified when executing a socket operation.
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The Socket Class
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The Socket class has three socket operations: connecting (ConnectAsync), sending data (SendAsync), and receiving data (ReceiveAsync). The socket must first connect to a remote endpoint, described by either the IPEndPoint or DnsEndPoint class. The former is used to connect to an IP address, and the latter is used to connect to a hostname. Tables 5-9 and 5-10 display the key methods and properties of the Socket class, respectively. Table 5-9. Key Methods of the System.Net.Sockets.Socket Class
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Name
ConnectAsync
Description
Static method initiates a connection to a remote host. A nonstatic version takes only a SocketAsyncEventArgs, while a static version takes a SocketType, a ProtocolType, and a SocketAsyncEventArgs. It returns true if the operation is pending, and false if the operation has completed.
CancelConnectAsync Used to cancel a pending connection. It must pass the SocketAsyncEventArgs used in the ConnectAsync method. SendAsync Sends data specified in a SocketAsyncEventArgs. It returns true if the operation is pending, and false if the operation has completed. Receives data from the open socket. It returns true if the operation is pending, and false if the operation has completed. The SocketAsyncEventArgs.Completed event on the SocketAsyncEventArgs object passed in the e parameter will be raised upon completion of the operation.
ReceiveAsync
CHAPTER 5 NETWORK COMMUNICATION
Shutdown
Shuts down sending, receiving, or both on the socket. It ensures that pending data is sent/received before shutting down a channel, so you should call this before you call Close. Closes the socket, releasing all resources. Releases unmanaged (and optionally managed) resources used by Socket.
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