🕸️ Network Programming Toolkit in Python

Welcome to the Network Programming Toolkit, a hacker-terminal-inspired collection of essential networking tools and educational projects built using pure Python. This repo is a one-stop practical guide to help you understand and implement core networking concepts like TCP/UDP communication, netcat-like functionality, socket proxying, and even SSH tunneling with Paramiko.

⚠️ All tools are built to work in restricted or hardened environments — where tools like netcat, wireshark, or compilers are unavailable — but Python is present.

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📁 Project Structure

.
├── SSH with Paramiko/
│   ├── sshrcmd.py        # Reverse SSH client
│   └── sshserver.py      # SSH server using Paramiko
├── Understanding of TCP UDP/
│   ├── tcpClient.py      # Basic TCP client
│   ├── tcpServer.py      # Basic TCP server (multi-threaded)
│   └── udpClient.py      # Basic UDP client
├── netcat.py             # Python replacement for netcat with shell, upload, execute
├── proxy.py              # TCP proxy with hexdump and packet interception
├── sshcmd.py             # Paramiko-based SSH command executor

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✨ Features

✅ TCP/UDP Fundamentals

• Learn raw socket programming using Python’s socket module.
• Build your own TCP/UDP clients and servers.
• Multi-threaded TCP server capable of handling multiple clients concurrently.

🧰 Netcat Clone (netcat.py)

• Upload files, spawn remote command shells, or execute specific commands — just like netcat.
• Works in both client and server mode.
• Can be used to tunnel basic shell access over TCP using only Python.

🔄 TCP Proxy (proxy.py)

• Intercept, inspect (via hexdump), and optionally modify traffic between two endpoints.
• Great for debugging, fuzzing, or analyzing unknown protocols.
• Customize requests and responses via intercept handlers.

🔐 SSH Toolkit (via Paramiko)

• sshcmd.py: Execute commands remotely over SSH (similar to ssh user@host 'command').
• sshrcmd.py: Reverse SSH shell — client connects to your Python SSH server and receives commands.
• sshserver.py: Minimal custom SSH server (useful on Windows clients without SSH services).

🔁 SSH Reverse Tunneling (Coming Soon: rforward.py)

• Tunnels internal network traffic to external systems via SSH reverse port forwarding.
• Ideal for situations where direct access is blocked but SSH is allowed.

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🔧 Getting Started

🐍 Prerequisites

• Python 3.6+
• Paramiko (for SSH tools)

pip install paramiko

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🚀 Usage Examples

🔌 TCP Client

python Understanding\ of\ TCP\ UDP/tcpClient.py

🖥️ TCP Server

python Understanding\ of\ TCP\ UDP/tcpServer.py

🛰️ UDP Client

python Understanding\ of\ TCP\ UDP/udpClient.py

🛠️ Netcat-like Tool

# Command shell listener
python netcat.py -t 0.0.0.0 -p 5555 -l -c

# Client shell access
python netcat.py -t 127.0.0.1 -p 5555

📡 TCP Proxy

# Example: Forward local port 9000 to 10.0.0.1:80
python proxy.py 127.0.0.1 9000 10.0.0.1 80 False

🔐 Paramiko SSH Command

python sshcmd.py
# Enter host, port, credentials, and the command to execute

🔁 Reverse SSH Client & Server

• First, run the server:

python sshserver.py

• Then, on the client machine:

python sshrcmd.py

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🧠 Why This Project Matters

When you're dropped into a hardened environment with no dev tools, no netcat, and limited access — but Python is available — this toolkit becomes your Swiss Army Knife. It's also a fantastic way to:

• Learn socket programming
• Understand TCP/UDP fundamentals
• Simulate reverse shells and SSH tunneling
• Debug live traffic using your own proxy

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🔒 Disclaimer

This repository is strictly for educational purposes and ethical cybersecurity training. Any misuse of the content for malicious purposes is against the intent of this project.

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👨‍💻 Author

Tanishq Arun Ingole 🎓 BTech CSE @ IIIT Pune | 💻 Ethical Hacker | 🎮 Game Developer 🔗 LinkedIn | 🌐 GitHub

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