Add systemd unit files for malpd and support systemd socket activation

bin/malpd

@@ -62,12 +62,16 @@ if Process.uid != 0
   exit(1)
 end
 
-FileUtils.mkdir_p(File.dirname(SOCKET_PATH))
-FileUtils.rm_f(SOCKET_PATH)
+if ENV["LISTEN_FDS"]
+  server = UNIXServer.for_fd(3)
+else
+  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)
+  server = UNIXServer.new(SOCKET_PATH)
+  File.chmod(0660, SOCKET_PATH)
+  FileUtils.chown(nil, "apache", SOCKET_PATH)
+end
 
 Signal.trap("TERM") { server.close }
 Signal.trap("INT") { server.close }

systemd/malpd.service

@@ -0,0 +1,10 @@
+[Unit]
+Description=MALP monitoring daemon
+Requires=malpd.socket
+
+[Service]
+Type=simple
+ExecStart=/var/www/malp/bin/malpd
+
+[Install]
+WantedBy=multi-user.target

systemd/malpd.socket

@@ -0,0 +1,10 @@
+[Unit]
+Description=malpd Unix socket
+
+[Socket]
+ListenStream=/run/malpd/malpd.sock
+SocketGroup=apache
+SocketMode=0660
+
+[Install]
+WantedBy=sockets.target