⚓ Lsport

A TUI and CLI tool for managing local and remote ports via SSH. Quickly identify which process is hogging a port and kill it instantly.

Features

• 📡 Live Port Monitor - Real-time table displaying ports, protocols (TCP/UDP), PIDs, process names, CPU%, and memory usage
• 🔌 TCP & UDP Support - Scans both TCP and UDP listening ports using multiple detection methods
• 🌐 Remote Monitoring - Monitor ports on remote servers via SSH
• 💻 CLI Mode - Use describe and kill commands for quick operations without TUI
• ⌨️ Interactive Navigation - Vim-style navigation with arrow keys or j/k
• 💀 Process Termination - Kill processes directly from the TUI or CLI with a single command
• 🔍 Regex Filtering - Filter ports by name, PID, or port number with regex support
• 🧟 Zombie Detection - Automatically highlights suspicious processes (high CPU + orphaned) in red
• 🎨 K9s-Inspired UI - Beautiful dark theme with color-coded information

Installation

macOS (Homebrew)

brew install subediparas5/tap/lsport

Linux (Debian/Ubuntu)

curl -fsSL https://subediparas5.github.io/lsport/install.sh | bash

Or manually:

# Add GPG key and repository
curl -fsSL https://subediparas5.github.io/lsport/KEY.gpg | sudo gpg --dearmor -o /usr/share/keyrings/lsport.gpg
echo "deb [signed-by=/usr/share/keyrings/lsport.gpg arch=$(dpkg --print-architecture)] https://subediparas5.github.io/lsport stable main" | sudo tee /etc/apt/sources.list.d/lsport.list
sudo apt update && sudo apt install lsport

Cargo (Any platform)

cargo install lsport

From Source

git clone https://github.com/subediparas5/lsport.git
cd lsport
cargo build --release
sudo cp target/release/lsport /usr/local/bin/

Binary Download

Download pre-built binaries from GitHub Releases.

Usage

Lsport supports two modes: TUI mode (default) for interactive monitoring and CLI mode for quick operations.

TUI Mode (Default)

# Monitor localhost (default)
lsport

# For killing system processes, you may need sudo
sudo lsport

# Monitor a remote server via SSH
lsport --host user@example.com

# Remote server with custom SSH port
lsport --host user@example.com:2222

# Use a specific SSH key
lsport --host user@example.com -i ~/.ssh/my_key

# Custom scan interval (5 seconds)
lsport -s 5

CLI Commands

Describe Command

Get detailed information about a port or process:

# Describe a port
lsport describe 8080

# Describe a PID
lsport describe 12345

# Describe on remote server
lsport describe -H user@example.com 8080

# Use specific SSH key
lsport describe -H user@example.com -i ~/.ssh/my_key 8080

Output includes:

• Port number and protocol (TCP/UDP)
• Process ID (PID)
• Process name
• CPU usage percentage
• Memory usage
• Parent process status
• Zombie process detection

Kill Command

Kill a process by PID or port number:

# Kill process by port
lsport kill --port 8080

# Kill process by PID
lsport kill --pid 12345

# Force kill (SIGKILL instead of SIGTERM)
lsport kill --port 8080 --force

# Kill on remote server
lsport kill --port 8080 -H user@example.com

# Force kill on remote server
lsport kill --pid 12345 -H user@example.com --force

Note:

• You must specify either --pid or --port, but not both
• If multiple processes are found on a port, lsport will list them and ask you to use --pid to specify which one to kill

CLI Options

Global Options (TUI Mode)

Option	Description
-H, --host <HOST>	Remote host (format: user@host:port or user@host or host)
-i, --identity <PATH>	Path to SSH private key
-s, --scan-interval <SECS>	Scan interval in seconds (default: 2)
-h, --help	Print help
-V, --version	Print version

Command-Specific Options

Command	Option	Description
describe	-H, --host <HOST>	Remote host to query
describe	-i, --identity <PATH>	Path to SSH private key
kill	--pid <PID>	Kill process by PID (required if --port not specified)
kill	--port <PORT>	Kill process by port number (required if --pid not specified)
kill	-H, --host <HOST>	Remote host to query
kill	-i, --identity <PATH>	Path to SSH private key
kill	-f, --force	Force kill (SIGKILL instead of SIGTERM)

Keybindings

Key	Action
↑ / k	Move selection up
↓ / j	Move selection down
PgUp	Move up 10 rows
PgDn	Move down 10 rows
Home	Go to first entry
End	Go to last entry
Enter	Kill selected process
/	Enter filter mode (supports regex!)
c	Connect to remote host
d	Disconnect from remote host
?	Toggle help popup
Esc	Clear filter / Close help
q	Quit

K9s-Style Sorting

Key	Action
Shift+P / 1	Sort by Port
Shift+O / 2	Sort by Protocol
Shift+I / 3	Sort by PID
Shift+N / 4	Sort by Name
Shift+C / 5	Sort by CPU %
Shift+M / 6	Sort by Memory

Press the same key again to toggle ascending/descending order.

Remote Connection (TUI Mode)

You can connect to a remote server directly from the TUI:

1. Press c to enter connect mode
2. Enter the host (format: user@host:port or user@host or host)
3. Press Enter to optionally specify an SSH key path, or Tab to skip
4. Press Enter again to connect

Disconnect: Press d while connected to return to local monitoring.

SSH Authentication: Authentication is attempted in this order:

1. Specified key (if provided during connect)
2. SSH agent (if running)
3. Default keys: ~/.ssh/id_ed25519, ~/.ssh/id_rsa, ~/.ssh/id_ecdsa

Filtering (TUI Mode)

Press / to enter filter mode. Filters support:

• Simple text: node matches any entry containing "node"
• Regex patterns: ^80[0-9]{2}$ matches ports 8000-8099
• Case-insensitive: All filters are case-insensitive

The context bar shows "Regex:" when your filter is a valid regex pattern.

Examples

# Quick check: What's using port 8080?
lsport describe 8080

# Kill a process blocking port 3000
lsport kill --port 3000

# Kill a process by PID
lsport kill --pid 12345

# Force kill a stuck process
lsport kill --pid 12345 --force

# Check remote server
lsport describe -H user@server.com 22

# Kill process on remote server by port
lsport kill --port 8080 -H user@server.com

# Kill process on remote server by PID
lsport kill --pid 12345 -H user@server.com --force

UI Design

Lsport features a k9s-inspired terminal UI with:

• 🎨 Dark theme with blue/cyan accents
• 📊 Clean table with alternating row colors
• 🔍 Sort indicators in column headers [P/1]▲
• ⌨️ Vim-style command bar at bottom
• 📋 Help popup (?) with full keybinding reference
• 🏷️ Color-coded protocols (TCP=blue, UDP=green) and CPU usage

Development

Prerequisites

• Rust 1.88.0 or later
• OpenSSL development libraries (for SSH support)

Setup

# Install pre-commit hooks
./scripts/setup-hooks.sh

# Or manually with pre-commit
pip install pre-commit
pre-commit install
pre-commit install --hook-type pre-push

Building

# Debug build
cargo build

# Release build
cargo build --release

# Run tests
cargo test

# Run clippy
cargo clippy --all-targets --all-features -- -D warnings

# Format code
cargo fmt

Project Structure

src/
├── main.rs      # Entry point, CLI parsing & event loop
├── app.rs       # Model - Application state management
├── scanner.rs   # Local port scanning & process correlation
├── remote.rs    # SSH remote scanning module
└── ui.rs        # View - Ratatui rendering logic

Releasing

# Patch release (0.1.0 → 0.1.1)
./scripts/release.sh patch

# Minor release (0.1.0 → 0.2.0)
./scripts/release.sh minor

# Major release (0.1.0 → 1.0.0)
./scripts/release.sh major

Dependencies

Crate	Purpose
ratatui	TUI framework
crossterm	Terminal backend
sysinfo	System/process information
listeners	Port to PID mapping
ssh2	SSH remote connections
clap	CLI argument parsing
regex	Filter pattern matching
anyhow	Error handling

Contributing

Contributions are welcome! Please see CONTRIBUTING.md for guidelines.

Security

For security concerns, please see SECURITY.md.

License

MIT License - see LICENSE for details.

Acknowledgments

• Inspired by k9s for the UI design
• Built with Ratatui