tunnel_eng.sh

#!/usr/bin/env bash
OPZIONI="SOCKS_proxy specific_port_tunnel exit"

function SOCKS {
  echo "[+] Insert the port on which the proxy will listen:"
  read PORTASOCKS
  echo "[+] Setting up proxy..."
  ssh -f -D 0.0.0.0:$PORTASOCKS $IP -p $PORT -N > /dev/null
  echo "[+] Proxy set up."
  return 0
}
function SPECIFICPORT {
  echo "[+] Insert the IP of the of the remote machine towards which the tunnel will be opened:"
  read REMOTEIP
  echo "[+] Insert the local port on which the tunnel will listen:"
  read LOCALPORT
  echo "[+] Insert the port of the remote machine towards which the tunnel should point:"
  read REMOTEPORT
  echo "[+] Setting up tunnel..."
  ssh -f -L 0.0.0.0:$LOCALPORT:$REMOTEIP:$REMOTEPORT $IP -p $PORT -N > /dev/null
  echo "[+] Tunnel set up"
  return 0
}
function IPANDPORT {
  echo "[+] Insert the (user@)IP of the jump box:"
  read IP
  echo "[+] Insert the port on which SSH is listening on the jump box:"
  read PORT
  return 0
}

echo "[+] What do you want to do?"
select opt in $OPZIONI; do
  if [ "$opt" = "SOCKS_proxy" ]; then
    IPANDPORT
    SOCKS
  elif [ "$opt" = "specific_port_tunnel" ]; then
    IPANDPORT
    SPECIFICPORT
  elif [ "$opt" = "esci" ]; then
    exit
  else
    echo "[-] Unknown option"
  fi
done