Dynamic Binding & RPC in C

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United States

Posted on Mar 31, 2013 / Est. budget $ 50 / Project closed

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Use sockets to implement dynamic binding and a simplified form of RPC. You will have three programs: a client; a server; and a name server. The client consists of a test program that calls your remote procedure. This program is linked to a client stub that does the usual jobs: marshalling parameters, connecting to the server, sending a request, receiving the reply and returning the result to the test program. You should do the connection using Internet domain stream sockets. The server should accept requests, unmarshall the parameters, call the remote procedure, and return the result. The server is linked to the remote procedure. You should write a client stub that has the same name, number of parameters and return type as your remote procedure. In other words, you are implementing a limited form of RPC. The client and server programs should run on different Linux machines. Your implementation should use dynamic binding meaning that your client program doesn’t know the address of the server. Instead it knows the IP address and port number of a third program - the name server. The name server accepts requests containing an identifier for the remote procedure and returns a handle containing the address of the server to be used in contacting the server or an error message if it doesn’t know where the server is. The connection from the client to the name server should also be done using stream sockets. The server will also contact the name server to register (it notifies the name server of its identifier and its address). When the server shuts down it deregisters with the name server.
Your name server should be written in such a way that it could handle more than one remote procedure. Your client stub should signal to the client if it can’t find the server by raising a signal. Your test program must be written in such a way that we can test the following: 1) server registers; 2) client gets handle; 3) client calls remote procedure and gets result; 4) server deregisters and moves then is successfully contacted by client which previously held a handle; 5) server deregisters, client stub which previously held a handle cannot contact server so it raises a signal. Describe the procedure to test each of these cases in your readme file.

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