A compact C-based prototype for high-throughput packet inspection and firewall rule management. The repository contains lean, focused components that demonstrate rule parsing, client/server interaction, and a multithreaded server for concurrent request handling.

• Rule-driven filtering: Loads simple text-based rules (e.g., ban.txt) to allow/deny traffic.
• Client–server harness: Minimal client and server programs for local validation.
• Multithreaded server: A threaded implementation for concurrent processing.
• Portable build: Standard Makefiles per module; no external runtime dependencies.

• Packet inspection utilities (e1): Basic rule I/O and packet checks for quick experiments and validation.
• Baseline client/server (e2): Straightforward single-threaded reference for behavior comparison and quick testing.
• Threaded server (serverThreaded): Concurrent server variant intended for higher throughput under load.

• e1/ — Rule reading and packet checking utilities; includes sample ban.txt.
• e2/ — Minimal client and server for interactive tests.
• serverThreaded/ — Multithreaded server and matching client harness.

• Requirements: POSIX-like environment, a C compiler (GCC/Clang), and make.
• Build: Use the Makefile within each module directory.
• Run: Start the server component for a module, then connect with the provided client. Adjust ban.txt to experiment with rules.