IPIP tunnel creator via bash

   1:  #!/bin/bash

   2:  #

   3:  # Tunnel ipip Automation

   4:  # Creator: Shiran Guez

   5:  #

   6:  TUN_ETH="eth0"

   7:  IP_DEST_EXT=""

   8:  TUNNEL_IP_SRC=""

   9:  TUNNEL_IP_DST=""

  10:  _CREATE_ () {

  11:  echo "Please enter the name of your local interface [eth0 is default]: "

  12:  echo "[ To Skip enter >>>skip<<< ]"

  13:  while :;

  14:  do

  15:      read COMM_ETH

  16:      if [ "$COMM_ETH" == "skip" ] ;then 

  17:          break

  18:      elif [ "$COMM_ETH" == "eth0" ] ;then

  19:          break

  20:      else

  21:          ifconfig "$COMM_ETH" >/dev/null

  22:          if [ $? -eq 0 ] ;then

  23:              TUN_ETH="$COMM_ETH"

  24:              break

  25:          else

  26:              echo "You have entered a wrong ethernet interface"

  27:              echo "Please try again: "

  28:          fi

  29:      fi

  30:   

  31:  done

  32:  localip=$(ifconfig $TUN_ETH | grep Bcast | awk '{print $2}' | awk -F: '{print $2}')

  33:  echo "Please enter the destination IP for the tunnel: "

  34:  while :;

  35:  do

  36:      read IP_DEST_EXT

  37:      echo "Are you sure $IP_DEST_EXT is a valid IP [Y]:"

  38:      read ANS_ME

  39:      ANS_ME=$(echo $ANS_ME | tr a-z A-Z)

  40:      if [ "$ANS_ME" == "Y" ] ;then

  41:          break

  42:      else

  43:          echo "Please enter destination again:"

  44:       fi

  45:  done       

  46:  echo "Please enter tunnel IP and Peer Address: "

  47:  while :;

  48:  do  

  49:      echo "IP : "    

  50:          read TUNNEL_IP_SRC

  51:      echo "Peer : "

  52:      read TUNNEL_IP_DST

  53:      echo "Peer subnet mask [ /16 , /24 ...]: "

  54:      read TUNNEL_IP_DST_MASK

  55:      echo "Tunnel IP will be $TUNNEL_IP_SRC and its peer address will be $TUNNEL_IP_DST using subnet mask $TUNNEL_IP_DST_MASK"

  56:      echo "Please confirm [Y]:"

  57:          read ANS_ME_NOW

  58:          ANS_ME_NOW=$(echo $ANS_ME_NOW | tr a-z A-Z)

  59:          if [ "$ANS_ME_NOW" == "Y" ] ;then

  60:                  break

  61:          else

  62:                  echo "Please enter again:"

  63:          fi

  64:   

  65:  done

  66:  ip tu ad ipiptun mode ipip local $localip remote $IP_DEST_EXT ttl 64 dev $TUN_ETH

  67:  ip ad ad dev ipiptun $TUNNEL_IP_SRC peer $TUNNEL_IP_DST/$TUNNEL_IP_DST_MASK

  68:  ifconfig ipiptun up

  69:  }

  70:   

  71:  _DESTROY_ () {

  72:  ip add | grep ipiptun > /dev/null

  73:  if [ $? -eq 0 ] ;then

  74:      ifconfig ipiptun down

  75:      echo "Tunnel was removed"

  76:  else

  77:      echo "No Tunnel to remove"

  78:  fi

  79:  }

  80:   

  81:  lsmod | grep ipip > /dev/null

  82:  if [ $? -eq 0 ] ;then

  83:      while :;

  84:      do

  85:          echo "Please enter 1 to create or 2 for removing a tunnel"

  86:          read SELECTION

  87:          if [ "$SELECTION" == "1" ] ; then

  88:              _CREATE_

  89:              break

  90:          elif [ "$SELECTION" == "2" ] ; then

  91:              _DESTROY_

  92:              break

  93:          fi

  94:      

  95:      done

  96:  else

  97:      echo "ipip module is not loaded try to first load the ipip module and then run the tool again, Thank you!"

  98:  fi