Add malpd daemon executable

bin/malpd

@@ -0,0 +1,43 @@
+#!/usr/bin/env ruby
+
+require "socket"
+require "fileutils"
+
+SOCKET_PATH = "/run/malpd/malpd.sock"
+
+if Process.uid != 0
+  $stderr.puts "malpd must be run as root"
+  exit(1)
+end
+
+FileUtils.mkdir_p(File.dirname(SOCKET_PATH))
+FileUtils.rm_f(SOCKET_PATH)
+
+server = UNIXServer.new(SOCKET_PATH)
+File.chmod(0660, SOCKET_PATH)
+FileUtils.chown(nil, "apache", SOCKET_PATH)
+
+Signal.trap("TERM") { server.close }
+Signal.trap("INT") { server.close }
+
+$stdout.puts "malpd listening on #{SOCKET_PATH}"
+
+loop do
+  conn = server.accept
+  request = conn.gets&.chomp
+
+  begin
+    case request
+    when nil
+      # empty request
+    else
+      conn.puts "unknown request: #{request}"
+    end
+  rescue => e
+    $stderr.puts "error handling request: #{e.message}"
+  ensure
+    conn.close
+  end
+rescue IOError
+  break
+end