- Write tests. relay-ctrl-age: relay-ctrl-allow: relay-ctrl-check: relay-ctrl-send: - Modify the protocol to send $USER and $DOMAIN. - Modify the protocol to send a timestamp and a cryptographic signature of all the rest of the packet + a secret. relay-ctrl-udp: - Save the sent environment variables into the file. - Restrict the set of allowed senders, using directory entries to enumerate the IPs. - Check the signatures of incoming packets. Store signatures for seperate servers seperately. - Bind the socket to a specific IP instead of IPV4ADDR_ANY.