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RPC Execution

RPC Execution. Binding Server. Register Services. Receive Query. Stub. Local Proc. Stub. Remote Proc. Local call. Query binding server. Return Server Address. Execute procedure. Unpack. Params packing. Local call. Wait. Pack results. Unpack result. Return. Return.

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RPC Execution

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  1. RPC Execution Binding Server Register Services Receive Query Stub Local Proc. Stub Remote Proc. Local call Query binding server Return Server Address Execute procedure Unpack Params packing Local call Wait Pack results Unpack result Return Return Caller Callee B. Prabhakaran

  2. Sun RPC Specification Server Side: square.x: /* file name */ struct square_in { /* input argument */ long arg1; } struct square_out { /* output argument */ long res2; } program SQUARE_PROG { version SQUARE_VERS { square_out SQUAREPROC(square_in) = 1; /* procedure no. = 1 */ } = 1; /* version number */ } = 0x3123 0000; /* program number */ Compilation Procedure: rpcgen –C square.x /* -C: generate C prototypes in square.h */ B. Prabhakaran

  3. Sun RPC: Server Side server.c: #include “unpipc.h” /* local headers */ #include “square.h” /* generated by RPCgen */ square_out * squareproc_1_svc (square_in *inp, struct svc_reg *rqstp) { static square_out out; out.res1 = inp->arg1 * inp->arg1; return(&out); } Compilation Procedures: cc –c server.c –o server.o cc –c square_svc.c –o square_svc.o /* contains “main” */ cc –o server server.o square_svc.o square.xdr.o libunpipc.a -lnsl Notes: libunpipc.a: library used in Stevens book; lnsl: Solaris system library Including RPC and XDR runtime functions B. Prabhakaran

  4. Client Side client.c : #include “unpipc.h” /* local headers */ #include “square.h” /* generated by rpcgen */ main(int argc, char **argv) { CLIENT *cl; /* defined in rpc.h */ square_in in; square_out *outp; if (argc != 3) err_quit(“usage: client <hostname> <integer_value>”); cl = Clnt_create(argv[1], SQUARE_PROG, SQUARE_VERS, “tcp”); in.arg1 = atol(argv[2]); if ((outp = squareproc_1(&in, cl) == NULL) err_quit(“%s”, clnt_sperror(cl, argv[1])); printf(“result: %d\n”, outp->res1); exit(0); } B. Prabhakaran

  5. Client Compilation Compilation: cc –c client.c –o client.o cc –c square_clnt.c –o square_clnt.o cc –c square_xdr.c –o square_xdr.o cc –o client client.o square_client.o square_xdr.o libunpipc.a -lnsl Notes: Rpcgen: generates square_xdr.c -> XDR data conversions square_clnt.c -> client stub Execution: client bsdi 11 -> result: 121 client 209.76.87.90 22 -> result: 484 client nosuchhost 11 -> nosuchhost:RPC:Unknownhost…. Client localhost 11 -> localhost: RPC: Program not registered B. Prabhakaran

  6. RPC Client-Server RPC Specification File square.x rpcgen #include square.h square_clnt.c square_xdr.c square_svc.c server.c client.c Runtime library cc cc server client B. Prabhakaran

  7. RPC Implementation • Sending/receiving parameters: • Use reliable communication? : • Use datagrams/unreliable? • Implies the choice of semantics: how many times a RPC may be invoked. Reference Book: Unix Network Programming by Richard Stevens, Prentice-Hall. B. Prabhakaran

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