Description
  A bash script for Ubuntu to self-hosting your own RustDesk Server OSS.

Usage
  Server
    After successfully installing RustDesk Server OSS, make sure to open these ports in the firewall.

    * hbbs: RustDesk ID/Rendezvous Server
        - 21114/tcp: used for web console, only available in pro version.
        - 21115/tcp: used for the NAT type test.
        - 21116:
            - 21116/tcp: used for TCP hole punching and connection service.
            - 21116/udp: used for the ID registration and heartbeat service.
        - 21118/tcp: used to support web clients.

    * hbbr: RustDesk Relay Server
        - 21117/tcp: used for the relay service.
        - 21119/tcp: used to support web clients.

    Please note that 21116 should be enabled both for TCP and UDP.
    If you do not need web client support, the corresponding ports 21118, 21119 can be disabled.

  Client
    After opening the client, you can click "Settings -> Network -> ID/Relay Server".
    Enter the IP address in the "ID Server" input box, the other two addresses can be left blank.

      server> $ curl -s -4 https://cloudflare.com/cdn-cgi/trace | grep ip | awk -F '=' '{ print $2 }'

    Enter the key in the "Key" input box.

      server> $ sudo cat /var/lib/rustdesk-server/id_ed25519.pub