ONC RPC Client Server System

🧭 Overview

This project implements an ONC RPC (Open Network Computing Remote Procedure Call) client–server system in C. The system defines a remote procedure interface, implements the corresponding client and server logic, and validates correct multi-terminal communication on Linux.

The project demonstrates end-to-end implementation of an RPC-based client–server workflow and explores how RPC interfaces, protocol stubs, and runtime execution interact at the systems level.

⚙️ Project Background

ONC RPC enables a client to invoke procedures on a remote server as if they were local function calls. This system consists of:

• A defined RPC interface
• Client and server protocol stubs
• Application-level client and server implementations

The project focuses on implementing and refining a complete RPC-based client–server system, including interface definition, client/server behavior, and runtime validation.

🔧 Implementation Details

• Designed and implemented the RPC interface and associated data structures
• Implemented client-side and server-side logic for remote procedure invocation
• Integrated protocol stubs to support RPC communication
• Validated correct request–response behavior across multiple terminals
• Ensured stable client–server execution under Linux

📁 Files

• hello.x – RPC interface definition
• hello.h – generated RPC header
• hello_clnt.c – generated client stub
• hello_svc.c – generated server stub
• hello_client.c – client application logic
• hello_server.c – server application logic

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🛠️ Build

On Linux or WSL, regenerate RPC code if needed:

rpcgen hello.x

Compile the server:

gcc -Wall -O2 hello_server.c hello_svc.c -o server

Compile the client:

gcc -Wall -O2 hello_client.c hello_clnt.c -o client

▶️ Run

Open two terminals.

Terminal 1 — start the server

./server

Terminal 2 — run the client

./client <server-hostname>

Replace with localhost if running locally.

✅ Validation

• Server successfully registers RPC services
• Client connects and invokes remote procedures
• Responses are correctly returned and displayed
• Communication functions across separate terminals

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📜 License

This project is licensed under the MIT License. See the LICENSE file for details.

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👤 Author

Hannah G. Simon