BUL — Network & Port Scanner 🔍

BUL is a concurrent local network and port scanner that combines the power of Go (Goroutines and Channels) with a modern, minimalist graphical user interface built on Fyne v2. With its user-friendly, high-contrast dark theme, it allows you to discover and analyze active devices on your network in seconds.

Screenshots

Network Scan (Device Discovery)

By specifying an IP range, it concurrently detects the status, response times (ms), and MAC addresses of active devices on the network.

Port Scan (Service Detection)

Scans the top 25 common ports, a specific port (e.g., 8080), or a specific port range (e.g., 50-120) of selected active devices, automatically highlighting and sorting open ports at the top.

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Features ✨

• Fast Network Scanning: Scans the provided IP range (e.g., 192.168.1.1 - 255) using ICMP (Ping) to report whether the device is active or inactive.
• Detailed Information: Resolves response times (RTT) and MAC addresses (via the ARP table) for active devices.
• Advanced Port Scanning: Select any discovered device from the list and perform a port scan with a single click.
  • Common Ports: If left blank, it automatically scans 25 critical ports (HTTP, HTTPS, SSH, FTP, MySQL, etc.).
  • Custom/Range Scanning: You can specify a single port (e.g., 8080) or a port range (e.g., 50-120).
  • Smart Sorting: Open ports are automatically moved to the top of the list once the scan finishes.
• Concurrency & Performance: Uses Goroutines, Channels, and Semaphore architecture in the background for maximum efficiency without freezing the UI. Thanks to Fyne's Data Binding, results are rendered in real-time.
• Cross-Platform: Can be compiled for Windows (.exe), Linux, and macOS (Apple Silicon & Intel) using GitHub Actions, functioning entirely as a native desktop application.

Usage 🚀

Running as a Developer

Make sure you have Go 1.22+ installed on your system.

# Download dependencies
go mod tidy

# Run the application (sudo may be required for ICMP Ping packets)
go run .

Downloading Pre-compiled Binaries

You can navigate to the Releases tab on the project's GitHub repository to download the executable suitable for your operating system and run it directly without any installation.

Tech Stack 💻

• Backend: Go (Golang)
• Concurrency: Goroutines, Channels, sync.WaitGroup, sync.RWMutex
• GUI: Fyne v2
• Data Binding: fyne.io/fyne/v2/data/binding
• System Communication: os/exec for ARP table reading and ICMP ping execution.

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Developed by Furkan Selek.