This is rbldnsd. Main changes from the original source: 1. Added CMake build system 2. Added LTO support when compiling 3. Better portability 4. Switched to semver versioning 5. Added hashed backend (dnhash) that uses less CPU but doesn't support wildcards/negations TODO: 1. Rate limits using leaky bucket model 2. Hyperscan based regexp backend 3. Multiprocessing using SO_REUSEPORT and eBPF filters to optimise UDP flows 4. Better documentation The current source tree has been forked from https://github.com/spamhaus/rbldnsd and is now maintained by Vsevolod Stakhov. The original source was written originally by Michael Tokarev <firstname.lastname@example.org> The original, unmantained source and debian packages can always be found at: http://www.corpit.ru/mjt/rbldnsd.html Copyright (C) 2018 Vsevolod Stakhov Copyright (C) 2016-2018 The Spamhaus Project Ltd. Copyright (C) 2002 Michael Tokarev This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.