### telnet.socket
[Unit]
Description=Telnet Server Activation Socket
Documentation=man:telnetd(8)

[Socket]
ListenStream=2323
Accept=true

[Install]
WantedBy=sockets.target

### telnet@.service
[Unit]
Description=Telnet Server
After=local-fs.target

[Service]
ExecStart=-/usr/bin/telnetd telnetd -i -l /bin/sh
StandardInput=socket