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# SourceMe # Recomended to set up passwordless ssh authentication https://linuxize.com/post/how-to-setup-passwordless-ssh-login/ # Copy the .pub key to both login.ansatt.ntnu.no and physics cluster workstation function sshtun() { # Replace $USER with your NTNU username local USERNAME=$USER if [[ -z "$USERNAME" ]]; then echo "USERNAME is not defined" return 1 fi local tunnel_sessions="${HOME}/.ssh/ssh-tunnels-created" if [[ ${1} == "help" ]] || [[ -z "$1" ]]; then local __help=" Usage: sshtun${FUNCNAME[0]} hostname where hostname must be a FQDN hostname! (eg. igor.phys.ntnu.no) This function will create a multiplexed ssh tunnel through one of the 3 hosts at NTNU after which will establish an ssh with X11 forwarding connection to your host using the tunnel. This way the connections, especially those requiring GUIs, will be really fast and responsive. Each time a new tunnel will be created even if you're trying to connect to the same host. To connect multiple times to the same host, follow the instructions on the screen after establishing a connection or, check the file \"$tunnel_sessions\" " echo "$__help" return 0 fi host ${1} if [ $? -eq 0 ]; then local options=( "login.ansatt.ntnu.no" "login.phys.ntnu.no" "login.stud.ntnu.no" ) # Print the menu options echo "Select the tunneling host" for ((i=0; i<${#options[@]}; i++)); do echo "$((i+1)). ${options[$i]}" done # Prompt the user to enter a choice read -p "Enter your choice (1-${#options[@]}) (1): " choice # Default option [1]; Change to another one if you want if [[ -z "$choice" ]]; then choice=1 fi echo "Choice was: $choice" # Validate the input re='^[0-9]+$' if ! [[ $choice =~ $re ]] || (( choice < 1 || choice > ${#options[@]} )); then return 1 fi # Process the chosen option case $choice in 1) t_host=tun-ansatt m_host=login.ansatt.ntnu.no ;; 2) t_host=tun-phys m_host=login.phys.ntnu.no ;; 3) t_host=tun-stud m_host=login.stud.ntnu.no ;; *) echo "Not a valid choice. Exiting" return 1 ;; esac echo "Connecting to ${1} through ${m_host} with user ${USERNAME}" local PORT=$(( ((RANDOM<<15)|RANDOM) % 63001 + 2000 )) local counter=0 while [[ $(netstat -ant -p TCP | grep ${PORT}) -ne 0 ]]; do echo "Trying new port ..." local PORT=$(( ((RANDOM<<15)|RANDOM) % 63001 + 2000 )) ((counter++)) if [[ $counter -gt 5 ]]; then echo "Couldn't find a free port" return 1 fi sleep 1 done local SSHCPath="${HOME}/.ssh/${USERNAME}@${m_host}:${PORT}-${1}" ssh -4 -f -N -T -M \ -o ExitOnForwardFailure=yes \ -o ControlMaster=autoask \ -o ControlPersist=10m \ -o ControlPath="${SSHCPath}" \ -L 127.0.0.1:${PORT}:${1}:22 ${USERNAME}@${m_host} local exit_code=$? if [[ $exit_code -eq 0 ]]; then sleep 3 echo -e "\n****************************************************" >> $tunnel_sessions echo "* @ $(date +%F/%T)" >> $tunnel_sessions echo "****************************************************" >> $tunnel_sessions echo -e "You can reconnect/reuse the tunnel to ${1} with:\n ssh -4 -X ${USERNAME}@127.0.0.1 -p ${PORT}" | tee -a "$tunnel_sessions" echo "Check ${tunnel_sessions} for tunnels opened" echo "FORWARDING added to port: ${PORT}" echo -e "Check for ControlMaster connections status:\n ssh -O check -S \"${SSHCPath}\" ${1}" | tee -a "$tunnel_sessions" echo -e "Stop the tunnels from accepting connections:\n ssh -O stop -S \"${SSHCPath}\" ${1}" | tee -a "$tunnel_sessions" ssh -4 -X ${USERNAME}@127.0.0.1 -p${PORT} else echo "ERROR: Couldn't create multiplexed connection!" retun 1 fi else echo -e "Hostname not found. Must be a FQDN hostname! (eg. igor.phys.ntnu.no)" echo "Type \"sshtun${FUNCNAME[0]} help\" for more info." fi } |
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