Centos vpn server creation script

#! /Bin/bash

Function installVPN (){
Echo "begin to install VPN services ";
# Check wether vps suppot ppp and tun
 
Yum remove-y pptpd ppp
Iptables -- flush POSTROUTING -- table nat
Iptables -- flush FORWARD
Rm-rf/etc/pptpd. conf
Rm-rf/etc/ppp
 
Arch = 'uname-M'
 
Wget http://www.hi-vps.com/downloads/dkms-2.0.17.5-1.noarch.rpm
Wget http://wty.name/linux/sources/kernel_ppp_mppe-1.0.2-3dkms.noarch.rpm
Wget http://www.hi-vps.com/downloads/kernel_ppp_mppe-1.0.2-3dkms.noarch.rpm
Wget http://www.hi-vps.com/downloads/pptpd-1.3.4-2.el6.$arch.rpm
Wget http://www.hi-vps.com/downloads/ppp-2.4.5-17.0.rhel6.$arch.rpm

Yum-y install make libpcap iptables gcc-c ++ logrotate tar cpio perl pam tcp_wrappers
Rpm-ivh dkms-2.0.17.5-1.noarch.rpm
Rpm-ivh kernel_ppp_mppe-1.0.2-3dkms.noarch.rpm
Rpm-qa kernel_ppp_mppe
Rpm-Uvh ppp-2.4.5-17.0.rhel6. $ arch. rpm
Rpm-ivh pptpd-1.3.4-2.el6. $ arch. rpm

Mknod/dev/ppp c 108 0
Echo 1>/proc/sys/net/ipv4/ip_forward
Echo "mknod/dev/ppp c 108 0">/etc/rc. local
Echo "echo 1>/proc/sys/net/ipv4/ip_forward">/etc/rc. local
Echo "localip 172.16.36.1">/etc/pptpd. conf
Echo "remoteip maid-254">/etc/pptpd. conf
Echo "ms-dns 8.8.8.8">/etc/ppp/options.ppt pd
Echo "ms-dns 8.8.4.4">/etc/ppp/options.ppt pd

Pass = 'openssl rand 6-base64'
If ["$1 "! = ""]
Then pass = $1
Fi

Echo "vpn pptpd $ {pass} *">/etc/ppp/chap-secrets

Iptables-t nat-a postrouting-s 172.16.36.0/24-j SNAT -- to-source 'ifconfig | grep' inet addr: '| grep-v' 127. 0.0.1 '| cut-d:-f2 | awk 'NR = 1 {print $1 }''
Iptables-a forward-p tcp -- syn-s 172.16.36.0/24-j TCPMSS -- set-mss 1356
Service iptables save

Chkconfig iptables on
Chkconfig pptpd on

Service iptables start
Service pptpd start

Echo "VPN service is installed, your VPN username is vpn, VPN password is $ {pass }"
 
}

Function repaireVPN (){
Echo "begin to repaire VPN ";
Mknod/dev/ppp c 108 0
Service iptables restart
Service pptpd start
}

Function addVPNuser (){
Echo "input user name :"
Read username
Echo "input password :"
Read userpassword
Echo "$ {username} pptpd $ {userpassword} *">/etc/ppp/chap-secrets
Service iptables restart
Service pptpd start
}

Echo "which do you want? Input the number ."
Echo "1. install VPN service"
Echo "2. repaire VPN service"
Echo "3. add VPN user"
Read num

Case "$ num" in
[1]) (installVPN );;
[2]) (repaireVPN );;
[3]) (addVPNuser );;
*) Echo "nothing, exit ";;
Esac