#!/bin/sh
self=${0##*/}
keytype=${self#dyndns.}
keytype=${keytype%%.*}

case "$keytype" in
  ssh-dss) keyfilename=dsa ;;
  ecdsa-sha2-nistp256) keyfilename=ecdsa ;;
  ssh-rsa|ssh-ed25519) keyfilename=${keytype#ssh-} ;;
  *) exit 1 ;;
esac

sudo ssh -i /etc/ssh/ssh_host_${keyfilename}_key dyndns@cryptonomic.net "$@"