Tinc VPN Setup script (BASH)

In Cyber Security Intelligence Couse, one of the first topics in networking was Tinc VPN.
I coded a little script that will setup your encrypted VPN connection.

Tinc is very useful when you need to set up a VPN quickly.

It is a easy to use, and user friendly :)

 #!/bin/bash

 # Tinc VPN Setup script.
 # Be sure, that your system is accessible from outside your LAN. Otherwise it's waste of time :)
 # By Alexander Korznikov.

 #there are text coloring variables
 bldred='\e[1;31m' # Red
 bldgrn='\e[1;32m' # Green
 bldylw='\e[1;33m' # Yellow
 txtrst='\e[0m'    # Text Reset

 function usage()
 {
 echo ""
 echo ""
 echo -e "$txtcyn Be sure you've installed tinc previously, by$txtgrn apt-get install tinc$txtrst"
 echo ""
 echo -e "$bldred Please note, this stupid script will not check your input!! Check it twice!"
 echo ""
 echo -e "$txtwht By the way, you can view the source and get some useful stuff from it :) $txtrst"
 echo ""
 echo -e "$bldgrn Usage: sudo $0 install$txtrst"
 echo ""
 echo -e "$txtwht\t by Alexander Korznikov, @CSI-7$txtrst"
 }

 function install()
 {

 echo ""
 echo -e "Enter your$bldgrn VPN Name$txtrst (default: myvpn) \c"
 read myvpn
 if [[ $myvpn != "myvpn" ]]
 then
 echo ""
 echo -e "Your VPN Name: \"$bldgrn$myvpn$txtrst\""
 myvpn=$myvpn
 else
 myvpn="myvpn"
 echo ""
 echo -e "Your VPN Name: \"$bldgrn$myvpn$txtrst\""
 fi

 mkdir -p /etc/tinc/$myvpn/hosts
 tincconf="/etc/tinc/$myvpn/tinc.conf"

 echo ""
 echo -e "Enter your host name: \c"
 read name
 echo "Name = $name" > $tincconf
 echo ""
 echo "Setting AddressFamily to ipv4..."
 echo "AddressFamily = ipv4" >> $tincconf
 echo ""
 echo "Setting Interface to \"tun0\"..."
 echo ""
 echo "Interface = tun0" >> $tincconf

 # this checks if you using tinc in internet or local network

 echo ""
 echo -e "Do you setup your VPN on$bldgrn WAN$txtrst or$bldgrn LAN$txtrst network? [wan/lan] \c"
 read answer
 if [[ $answer == "wan" ]]
 then
 wget getmyipaddress.org -O ./inetip.txt -o /dev/null
 myip=`cat inetip.txt |grep 'Your IP Address' | cut -d":" -f2 | sed -e 's, ,,g' |cut -d "<" -f1`
 #rm inetip.txt
 elif [[ $answer == "lan" ]]
 then
 myip=`ifconfig  | grep 'inet addr:'| grep -v '127.0.0.1' | cut -d: -f2 | awk '{ print $1}'`
 else
 echo "Incorrect answer...exiting!"
 echo ""
 echo "Cleanup..."
 sleep 1
 rm -r /etc/tinc/$myvpn
 exit 0
 fi

 echo -e "For debug.. your IP Address is $bldgrn"$myip"$txtrst..."
 echo ""
 echo "Address = $myip" > /etc/tinc/$myvpn/hosts/$name

 echo -e "Enter your$bldgrn VPN IP address$txtrst [ex. 5.0.0.22]: \c"
 read vpnip
 echo "Subnet = $vpnip/32" >> /etc/tinc/$myvpn/hosts/$name
 echo ""

 #checking if you already have private key for $myvpn

 echo "Removing all previously generated keys for $myvpn..."
 sleep 1
 echo ""

 if [ -e /etc/tinc/$myvpn/rsa_key.priv ]
  then
  rm /etc/tinc/$myvpn/rsa_key.priv
  fi
 echo ""
 echo "Now, we'll generate public/private keys..."
 echo ""
 echo -e "Press Enter to continue... \c"
 read blabla
 tincd -n $myvpn -K4096

 echo "Creating start-up script..."
 sleep 1      #it's just for fun ;)
 echo ""
 echo "!#/bin/bash" > /etc/tinc/$myvpn/tinc-up
 echo "ifconfig \$INTERFACE $vpnip netmask 255.255.255.0" >> /etc/tinc/$myvpn/tinc-up

 chmod +x /etc/tinc/$myvpn/tinc-up

 echo "Creating shutdown script..."
 sleep 1
 echo "!#/bin/bash" > /etc/tinc/$myvpn/tinc-down
 echo "ifconfig \$INTERFACE down" >> /etc/tinc/$myvpn/tinc-down

 chmod +x /etc/tinc/$myvpn/tinc-down

 echo ""
 echo -e "Enter the name you want to connect to [ex. john]: \c"
 read connectto
 echo "ConnectTo = $connectto" >> $tincconf

 echo ""
 echo ""
 echo -e "Now, exchange public keys, and run $bldgrn\"tincd -n $myvpn\"$txtrst"
 echo ""

 if [[ $answer == "wan" ]]
 then
 echo -e "$bldred   Be sure, if your system is accessible from outside.$txtrst"
 echo ""
 fi

 nautilus /etc/tinc/$myvpn/hosts

 echo "Good luck."
 echo ""
 }

 if [[ $1 = "install" ]]
 then
  install
 else
  usage
 fi