bcr 0.2.0

bcr 0.2.0

bcr is a modern, performance-optimized broadcast relay for Linux — a hardened Rust
replacement for pptpd's bcrelay. It forwards UDP broadcast/multicast traffic
between interfaces with allowlist filtering, optional NAT, and privilege dropping.

Highlights

• Debian packages for amd64 and arm64, including a systemd unit, a
  bcr(8) man page, an example config, and maintainer scripts. Lintian-clean,
  native versioning.
• Safe by default: drops to an unprivileged user (nobody) after opening
  its raw sockets, deny-by-default config, strict config parsing.
• Dependency cleanup toward Debian inclusion: removed the unused socket2
  dependency and widened the nix requirement (>=0.30, <0.32) so distros can
  build against what they ship (e.g. Debian's nix 0.30.1).

Install

Download the .deb matching your architecture, then:

sudo apt install ./bcr_0.2.0_amd64.deb   # or ./bcr_0.2.0_arm64.deb
sudoedit /etc/default/bcr                # set BCR_INPUT / BCR_OUTPUT interfaces
sudo systemctl enable --now bcr

The service ships disabled and starts once interfaces are configured. See
man 8 bcr for the full reference.

Changes since v0.1.0

• Debian packaging: .deb (amd64 + arm64), systemd unit, man page, maintainer scripts
• Example bcr.conf and packaging/build-deb.sh cross-build script
• Regularized versioning; bumped to 0.2.0
• Removed the unused socket2 dependency
• Widened the nix version range for distro compatibility
• Man page and package description fixes