FTP Client-Server Project

This project implements the File Transfer Protocol (FTP) as described in RFC 959. It includes a client and a server application written in C++, providing core FTP functionalities such as file transfer, directory listing, login/logout, and support for both active and passive modes.

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Features

General Features

• Protocol Compliance: Implements the FTP standard (RFC 959).
• Client-Server Interaction: The client and server can communicate with any standard-compliant FTP implementation.
• Input Validation: Robust validation of input parameters and commands.
• Modes of Operation:
  • Active mode (default).
  • Passive mode (switchable using the PASV command).

Client Functionality

• Connect/Disconnect: Establish and terminate connections with the server.
• Authentication: User login and password authentication.
• File Transfer:
  • Upload (STOR) and download (RETR) files (supports binary and ASCII modes).
  • Directory listing (LIST) with detailed output.
• Transfer Modes:
  • ASCII (TYPE A).
  • Binary (TYPE I).
• Command Support: Includes USER, PASS, PORT, PASV, LIST, RETR, STOR, and QUIT.

Server Functionality

• User Management:
  • Reads user credentials from credentials.txt.
  • Supports hashed passwords for secure authentication.
• File Management:
  • Maintains separate directories for authenticated users.
  • Handles file uploads and downloads with appropriate permissions.
• Command Handling: Processes all client commands (LIST, STOR, RETR, etc.) with detailed response codes.

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Project Requirements

Client

• Implements the client-side of the FTP protocol.
• Connects to any standard FTP server and performs all functionalities as per the standard.

Server

• Implements the server-side of the FTP protocol.
• Accepts connections and commands from any standard FTP client.

Supported Commands

• USER: Provide a username for login.
• PASS: Authenticate using a password.
• PORT: Enable active mode and set the client data port.
• PASV: Enable passive mode for data transfer.
• LIST: List directory contents.
• RETR: Retrieve a file from the server.
• STOR: Upload a file to the server.
• TYPE: Set the transfer mode (ASCII or binary).
• QUIT: Disconnect from the server.

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Setup and Compilation

Prerequisites

• C++ compiler with support for C++17 or later.
• POSIX-compatible environment (Linux recommended).

Compilation

1. Clone the repository:

   git clone https://github.com/your-repo/ftp-project.git
   cd ftp-project