Script to generate an OpenVPN client configuration file in the unified format

ovpn-writer.sh

#!/bin/sh

##
## Usage: ./ovpn-writer.sh CA_CERT CLIENT_CERT CLIENT_KEY
## File save as hostname.ovpn and yealink.tar
## using OVPN port = 636
##

server=$(wget -qO- eth0.me)
cacert=${1?"The path to the ca certificate file is required"}
client_cert=${2?"The path to the client certificate file is required"}
client_key=${3?"The path to the client private key file is required"}

hostname=$(cat /etc/hostname)
filename=${hostname}.ovpn

echo "client
dev tun
dev-type tun
proto tcp
remote ${server}
port 636
resolv-retry infinite
nobind
persist-key
persist-tun
;ns-cert-type server
;tls-auth ta.key 1
;cipher x
comp-lzo
verb 3

<ca>" > ${filename}

cat ${cacert} >> ${filename}

echo "</ca>
<cert>" >> ${filename}

cat ${client_cert} >> ${filename}

echo "</cert>
<key>" >> ${filename}

cat ${client_key} >> ${filename}

echo "</key>" >> ${filename}

/bin/cp ${filename} vpn.cnf && tar -cf yealink.tar vpn.cnf && rm vpn.cnf