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Changelog

All notable changes to Limbo are documented here.

Format follows Keep a Changelog. Versions follow Semantic Versioning.

[1.0.0] - 2025-02-17

Added

Core

  • BandwidthMonitor — Real-time sliding-window bandwidth tracking (download/upload rates, peak rates, totals)
  • BlacklistManager — Persistent auto-blacklist with import/export, event notifications, IP address filtering
  • IspBehaviorAnalyzer — Detects RST injection, silent drops (3s timeout), DNS poisoning; fires OnBlockingDetected event
  • ConnectionTracker — Tracks inbound/outbound TCP connections, detects silent drops

Radar System

  • Auto-detects blocked domains via IspBehaviorAnalyzer + ConnectionTracker
  • Automatically adds blocked domains to blacklist and creates Adaptive bypass profile
  • Persists to %LOCALAPPDATA%\Limbo\Auto-Blacklist.txt

CLI

  • radar command — Lists all auto-detected blocked domains with timestamps
  • radar-import <file> — Imports a radar blacklist from file
  • radar-export <file> — Exports current radar blacklist to file
  • radar-clear — Clears all radar entries
  • add-profile now supports all bypass parameters:
    • --frag <n> — Fragment size (TcpFragmentation / SmartFragmentation)
    • --ttl <n> — Fake TTL value (FakeTtl / UdpFake)
    • --split <n> — Split position (Desync)
    • --offset <n> — SNI split offset (SmartFragmentation)
    • --ech-name <s> — ECH public name (Ech)
    • --quic-size <n> — Fake packet size (QuicFake)
  • test command enhanced: latency measurement, IP address list, DNS tampering check
  • run command: live bandwidth stats line (↓/↑ rates updated every second)
  • list-profiles shows all profile parameters
  • --show-config shows all configuration fields

GUI

  • Live bandwidth stats in status bar (↓/↑ rates + peak)
  • Radar panel with auto-detected blocked domains list
  • Radar import/export buttons
  • System tray: minimize to tray, close to tray, start minimized options
  • Dark / Light / System theme toggle

ECH

  • Full X25519 HPKE implementation (X25519 key exchange + AES-128-GCM encryption)
  • Encrypts ClientHello SNI so DPI cannot read target domain

DNS

  • Parallel A + AAAA queries via DoH
  • Configurable DoH server URL (Cloudflare, Google, Quad9)
  • Response caching with TTL

Testing

  • 48 unit tests (up from 24)
  • BlacklistManagerTests — 8 tests covering add, duplicate prevention, events, IP filtering, import/export, persistence
  • BandwidthMonitorTests — 8 tests covering totals, rates, peak, Reset, FormatRate
  • IspBehaviorAnalyzerTests — 8 tests covering RST detection, timeout analysis, events, DNS poisoning

Project

  • GPL v2 license
  • .gitignore for .NET / WPF / WinDivert / user data
  • CONTRIBUTING.md, CHANGELOG.md, SECURITY.md
  • REPORT.md — Comprehensive architecture and implementation report

Changed

  • BlacklistManager constructor now accepts optional full path (enables isolated test instances)
  • README rewritten: WinDivert setup instructions, GoodbyeDPI comparison, Contributing section, Acknowledgements

Fixed

  • Culture-sensitive FormatRate output (decimal separator varies by locale; tests now use Contains not Equal)

[0.2.0] - 2025-01

Added

  • Per-domain wildcard profile system (*.discord.com, *.twitter.com)
  • JSON configuration (%LOCALAPPDATA%\Limbo\config.json)
  • Profile import / export
  • 7 bypass strategies: TcpFragmentation, SmartFragmentation, Desync, FakeTtl, UdpFake, QuicFake, ECH
  • Adaptive mode — tests all strategies, saves the best
  • Automatic calibration per domain
  • SIMD (AVX2) packet parsing for SNI offset detection
  • WPF GUI with dark/light theme
  • Basic CLI (run, calibrate, test, add-profile, remove-profile, list-profiles)
  • DNS over HTTPS (Cloudflare 1.1.1.1 default)
  • 24 unit tests

[0.1.0] - 2025-01

Added

  • Initial proof of concept
  • WinDivert P/Invoke wrapper (Limbo.Driver)
  • Basic TCP fragmentation bypass
  • Single global configuration