b4 Files

[1.28.1] - 2025-12-30

• ADDED: Web server bind address setting - control which network interface the web UI listens on (e.g., 127.0.0.1 for localhost-only access, 0.0.0.0 for all interfaces). Supports IPv6.
• ADDED: Added Skip DNS toggle in Discovery - useful when you know DNS isn't blocked and want faster results.
• ADDED: Support for MIPS devices with soft float.
• ADDED: Post-ClientHello RST injection - sends fake connection reset after the initial handshake to confuse DPI systems that track connection state. Enable with Post-ClientHello RST toggle in TCP Desync Set settings.
• IMPROVED: Discovery now finds the optimal TTL for a specific network, instead of using a fixed value.
• IMPROVED: Removed DPI fingerprinting phase from discovery - it was slow and unreliable. Discovery now starts testing bypass strategies immediately, making the process faster.
• IMPROVED: Shutdown behavior - B4 now waits up to 5 seconds for in-flight packet operations to complete gracefully before terminating.
• FIXED: DPI bypass not working for LAN devices on routers using nftables (e.g., OpenWrt with fw4 firewall).
• FIXED: TCP desync bypass methods (rst, fin, ack, combo, full modes) were sending malformed packets, causing them to fail or be ignored. Affects both IPv4 and IPv6.
• FIXED: Restored missing Packet Mark setting in Network Configuration - allows customizing the firewall mark used for traffic routing.
• FIXED: Potential connection hangs caused by packets getting stuck in the processing queue without verdicts being set.
• FIXED: Memory leak where packet injection operations could continue running after service shutdown, potentially causing crashes or instability during restart.
• FIXED: Race condition in network interface name caching that could cause incorrect packet filtering decisions on multi-interface systems.
• FIXED: Fragmented IP packets now bypass B4 processing entirely to prevent incomplete packet inspection and potential protocol violations.
• REMOVED: Fragmentation strategy overlap — functionality merged into combo.
• CHANGED: Fragmentation combo now supports decoy packets. When enabled, B4 sends a fake ClientHello with a whitelisted domain (e.g., ya.ru, vk.com) before sending the real fragmented request. Can be found in Fragmentaiton Tab set settings.

Full Changelog: https://github.com/DanielLavrushin/b4/compare/v1.28.0...v1.28.1