myvpn-setup

#!/bin/bash

function announce() {
    echo -e "\n\n\n***************************************"
    echo -e "$1"
    echo "***************************************"
}

function err() {
    echo -e "Error:" $* 1>&2
}

if [ ! -f "./.myvpn-create-server.sh" ]; then
    err "Invalid setup"
    exit 11
elif [ $# -ne 0 ]; then
    err "This does not accept arguments!\nUsage:\n\t<parameters & values> ./myvpn-setup"
    exit 21
elif [ "$REMOTE_HOSTNAME" = "" ]; then
    err "Remote hostname is not specified. Set variable 'REMOTE_HOSTNAME'."
    exit 31
elif [ "$REMOTE_USER" = "" ]; then
    err "Remote username is not specified. Set variable 'REMOTE_USER'."
    exit 32
elif [ "$REMOTE_CONFIG_DIR" = "" ]; then
    err "Location of config directory in remote is not specified. Set variable 'REMOTE_CONFIG_DIR'."
    exit 33
elif [ "$LOCAL_CONFIG_DIR" = "" -o ! -d "$LOCAL_CONFIG_DIR" ]; then
    err "Location of config directory in local is either not specified or doesn't exist. Set variable 'LOCAL_CONFIG_DIR' to a valid/writable directory path"
    exit 34
elif [ "$VPN_SERVER_NAME" = "" ]; then
    err "Name for the VPN server is not specified. Set variable 'VPN_SERVER_NAME'."
    exit 35
fi

set -e

announce "Copying OpenVPN server creation script to remote machine '$REMOTE_HOSTNAME'"
ssh $REMOTE_USER@$REMOTE_HOSTNAME "mkdir -p $REMOTE_CONFIG_DIR"
scp ./.myvpn-create-server.sh $REMOTE_USER@$REMOTE_HOSTNAME:$REMOTE_CONFIG_DIR

announce "Executing OpenVPN server creation script at remote machine"
ssh $REMOTE_USER@$REMOTE_HOSTNAME "cd $REMOTE_CONFIG_DIR; ./.myvpn-create-server.sh"

announce "Downloading key from remote machine to local machine (at location $LOCAL_CONFIG_DIR)"
scp $REMOTE_USER@$REMOTE_HOSTNAME:$REMOTE_CONFIG_DIR/static.key $LOCAL_CONFIG_DIR/$VPN_SERVER_NAME.key

announce "Creating client configuration file with name '$VPN_SERVER_NAME.conf'"
echo "remote $REMOTE_HOSTNAME
dev tun
ifconfig 10.8.0.2 10.8.0.1
secret $LOCAL_CONFIG_DIR/$VPN_SERVER_NAME.key
redirect-gateway def1
comp-lzo
keepalive 10 60
ping-timer-rem
persist-tun
persist-key" > $LOCAL_CONFIG_DIR/$VPN_SERVER_NAME.conf

announce "Removing shell script at remote"
ssh $REMOTE_USER@$REMOTE_HOSTNAME "rm $REMOTE_CONFIG_DIR/.myvpn-create-server.sh"

announce "Creating shell scripts at local (for starting and stopping VPN server at remote)"
echo "ssh $REMOTE_USER@$REMOTE_HOSTNAME \"cd $REMOTE_CONFIG_DIR; sudo openvpn --daemon --config server.conf\"" > "$LOCAL_CONFIG_DIR/start-$VPN_SERVER_NAME.sh"
chmod u+x "$LOCAL_CONFIG_DIR/start-$VPN_SERVER_NAME.sh"
echo "ssh $REMOTE_USER@$REMOTE_HOSTNAME \"sudo pgrep openvpn | xargs sudo kill -9\"" > "$LOCAL_CONFIG_DIR/stop-$VPN_SERVER_NAME.sh"
chmod u+x "$LOCAL_CONFIG_DIR/stop-$VPN_SERVER_NAME.sh"