File Transfer Console Application

This is a C++ console application for secure file transfer between a client and server, using OpenSSL for encryption. Designed for Windows OS, it supports essential file transfer commands with a simple, Linux-like command-line interface.

Requirements

• Operating System: Windows
• C++ Version: 20
• OpenSSL Version: 3.3.2

Features

• Client/Server Architecture: Facilitates file transfers between two endpoints.
• Encryption: Utilizes OpenSSL for secure data transfer.
• Certificate Management: Includes tools for certificate generation, saving, and validation using OpenSSL.
• Command Line Interface: Supports Linux-like commands for ease of use.

Usage

Launch the application in either server or client mode. Use the following commands to interact with the application. To create a server or connect to a server, you first need to generate ("crtkey gen") or use a PEM file ("crtkey use") that must contain a private key and a certificate.

Commands

• server
  Runs the server side of the application.
  Usage: server <port>
  Example: server 12345

• connect
  Connects the client to a specified server address and port.
  If no port is specified, the application defaults to port 22.
  Example:

  • Connect to a server on the default port: connect 127.0.0.1
  • Connect to a server on a specified port: connect 127.0.0.1:12345

• send
  Sends a file from the client’s current directory to the server.
  Usage: send <filename>
  Example: send data.txt

• cd
  Changes the current directory on the client side.
  Usage: cd <path>
  Example: cd path/to/directory

• ls
  Lists all files in the client’s current directory.
  Usage: ls

• crtkey
  Manages client certificates.
  Options:

  • gen: Generates new certificates.
  • save: Saves current certificates to a PEM file.
    Example:
  • Generate certificates: crtkey gen
  • Save certificates: crtkey save
  • Generate and save certificates: crtkey gen save