plink is a secure, efficient peer-to-peer file transfer tool that enables direct file sharing between devices without relying on centralized servers. Built with modularity and security in mind.

• Multiple Connection Methods: Direct connection, UPnP, NAT hole punching, and role reversal
• End-to-End Encryption: AES-256 encryption with secure key exchange
• Smart Chunking: Efficient data chunking for large file transfers
• Cross-Platform: Works on Windows, macOS, and Linux
• Secure by Default: All transfers are encrypted and verified

plink/
├── README.md
├── requirements.txt
├── setup.py
├── .gitignore
├── docs/
│   ├── API.md
│   ├── ARCHITECTURE.md
│   └── EXAMPLES.md
├── backend/
│   ├── __init__.py
│   ├── networking/
│   │   ├── __init__.py
│   │   ├── core/
│   │   │   ├── __init__.py
│   │   │   ├── connection_manager.py
│   │   │   ├── peer_discovery.py
│   │   ├── strategies/
│   │   │   ├── __init__.py
│   │   │   ├── direct_connection.py
│   │   │   ├── upnp_connection.py
│   │   │   ├── hole_punching.py
│   │   │   └── role_reversal.py
│   │   └── utils/
│   │       ├── __init__.py
│   │       ├── network_utils.py
│   │       └── port_scanner.py
│   └── cryptography/
│       ├── __init__.py
│       ├── core/
│       │   ├── __init__.py
│       │   ├── encryption.py
│       │   ├── key_exchange.py
│       │   └── hash_verification.py
│       ├── data/
│       │   ├── __init__.py
│       │   ├── chunk_manager.py
│       │   ├── metadata.py
│       │   └── compression.py
│       └── utils/
│           ├── __init__.py
│           ├── crypto_utils.py
│           └── random_generator.py
├── frontend/
    ├── __init__.py
    ├── cli/
    │   ├── __init__.py
    │   ├── argument_parser.py
    │   ├── command_handler.py
    │   └── output_formatter.py
    │  
    └── config/
        ├── __init__.py
        ├── settings.py

• Python 3.8 or higher
• pip package manager

Sender:

plink send /path/to/file.txt

Receiver:

plink receive

Send with specific connection method:

plink send /path/to/file.txt --method upnp --port 8080

Receive with custom settings:

plink receive --output-dir /downloads --method hole-punch

plink send <file_path> [OPTIONS]

OPTIONS:
  --method, -m          Connection method (direct, upnp, hole-punch, role-reverse)
  --port, -p           Port number (default: 8080)
  --encryption, -e     Encryption method (aes256, chacha20)
  --chunk-size, -c     Chunk size in KB (default: 1024)
  --compress           Enable compression
  --password           Set transfer password
  --timeout            Connection timeout in seconds
  --resume             Resume interrupted transfer
  --verify             Verify file integrity after transfer

plink receive [OPTIONS]

OPTIONS:
  --output-dir, -o     Output directory (default: current directory)
  --port, -p           Port number (default: 8080)
  --method, -m         Preferred connection method
  --password           Transfer password
  --auto-accept        Automatically accept transfers
  --max-size           Maximum file size to accept (MB)

• Use Case: Same network, known IP addresses
• Advantages: Fastest, most reliable
• Requirements: Open ports, direct network access

• Use Case: Behind NAT with UPnP-enabled router
• Advantages: Automatic port forwarding
• Requirements: UPnP-enabled router

• Use Case: Both peers behind NAT
• Advantages: Works through most NAT configurations
• Requirements: STUN server access

• Use Case: Asymmetric NAT situations
• Advantages: Fallback when other methods fail
• Requirements: One peer with open connectivity

1. Create a feature branch from main
2. Make virtual environments and install requirements.txt
3. Make your changes with appropriate tests
4. Update documentation and requirement.txt if needed
5. Ensure all tests pass
6. Submit pull request with clear description