This repository contains a firewall application developed in C#, designed to provide an intuitive graphical user interface (GUI) for managing firewall rules. The application allows users to define custom rules, validate packets, and enhance network security.

• Programming Language: C#
• Framework: .NET Framework (version 4.7 or higher)
• IDE/Compiler: Visual Studio 2019 (or higher)
• Supported Platforms: Windows OS

• Development Environment: Visual Studio 2019 or later (with Windows Forms development workload installed).
• Framework: .NET Framework 4.7 or later.

• Visual Studio 2019
• Visual Studio 2022

1. Welcome Form: Entry point of the application. Contains navigation buttons to access tutorials and the main firewall program.
2. Tutorial Form: Provides step-by-step instructions for using the firewall and adding custom rules.
3. Firewall Form: Central interface for validating packets and managing rules. Allows users to:
   • Enter source and destination IP addresses, ports, and protocols.
   • View default and custom rules.
   • Add custom rules.
4. Admin Login Form: Secures access to the custom rule management section.
5. Add Custom Rules Form: Enables users to define and add custom rules to the firewall.

1. Packet Class: Represents a network packet with attributes such as source/destination IP, port, protocol, and timestamp.
2. Rule Class: Defines firewall rules with properties like rule number, IP address, port, protocol, and decision (allow or deny).
3. Firewall Class: Manages default and custom rules, and validates packets against these rules. Contains methods for loading rules, adding new ones, and performing packet checks.

1. Welcome Page:
   • Users start at the Welcome Form, where they can choose to view a tutorial or proceed to the Firewall Form.
2. Tutorial Form:
   • Provides a guide on how to use the application and manage rules.
3. Firewall Form:
   • Users input packet details (IP, port, protocol) and validate packets.
   • Custom rules can be added after successful admin authentication.
   • Default and custom rules can be viewed via pop-up message boxes.
4. Admin Login Form:
   • Ensures only authorized users can add custom rules.
   • Upon successful login, the Add Custom Rules Form is displayed.
5. Add Custom Rules Form:
   • Allows users to define rule parameters such as IP address, port, protocol, and decision.
   • Validates user input and updates the rule set accordingly.

1. Authentication: The application uses hardcoded admin credentials instead of a secure database-driven authentication system.
2. Batch Operations: Does not support batch processing of packets or rules.
3. Database Integration: Custom rules are stored in files instead of a database, limiting scalability and robustness.
4. Platform Restriction: The application is Windows-only due to its reliance on Windows Forms.