Reconnecting a failed VPN connection on Synology by Ian Harrier

vpn-heartbeat.sh

#!/bin/bash

## Reconnect Synology VPN
## Written by Ian Harrier
## Based on https://forum.synology.com/enu/viewtopic.php?f=241&t=65444
## From: https://blog.harrier.us/reconnecting-a-failed-vpn-connection-on-synology-dsm-6/

###
# Process config files
###

# Pull in the VPN config files
L2TP_CONFIG=$(cat /usr/syno/etc/synovpnclient/l2tp/l2tpclient.conf)  
OPENVPN_CONFIG=$(cat /usr/syno/etc/synovpnclient/openvpn/ovpnclient.conf)  
PPTP_CONFIG=$(cat /usr/syno/etc/synovpnclient/pptp/pptpclient.conf)

# Concatenate the config files
CONFIGS_ALL="$L2TP_CONFIG $OPENVPN_CONFIG $PPTP_CONFIG"

# How many VPN profiles are there?
CONFIGS_QTY=$(echo "$CONFIGS_ALL" | grep -e '\[l' -e '\[o' -e '\[p' | wc -l)

# Only proceed if there is 1 VPN profile
if [ $CONFIGS_QTY -eq 1 ]  
then  
    echo "INFO: There is 1 VPN profile. Continuing..."
elif [ $CONFIGS_QTY -gt 1 ]  
then  
    echo "ERROR: There are $CONFIGS_QTY VPN profiles. This script supports only 1 VPN profile. Exiting..."
    exit 1
else  
    echo "WARNING: There are 0 VPN profiles. Please create a VPN profile. Exiting..."
    exit 1
fi

###
# Set variables
###

PROFILE_ID=$(echo $CONFIGS_ALL | cut -d "[" -f2 | cut -d "]" -f1)  
PROFILE_NAME=$(echo "$CONFIGS_ALL" | grep -oP "conf_name=+\K\w+")  
PROFILE_RECONNECT=$(echo "$CONFIGS_ALL" | grep -oP "reconnect=+\K\w+")

if [ $(echo "$CONFIGS_ALL" | grep '\[l') ]  
then  
    PROFILE_PROTOCOL="l2tp"
elif [ $(echo "$CONFIGS_ALL" | grep '\[o') ]  
then  
    PROFILE_PROTOCOL="openvpn"
elif [ $(echo "$CONFIGS_ALL" | grep '\[p') ]  
then  
    PROFILE_PROTOCOL="pptp"
fi

###
# Check the VPN connection
###

if /usr/syno/bin/synovpnc get_conn | grep -q "Uptime"  
then  
    echo "INFO: VPN is already connected. Exiting..."
    exit 0
fi

if [ $PROFILE_RECONNECT != "yes" ]  
then  
    echo "WARNING: VPN is not connected, but reconnect is disabled. Please enable reconnect for for the \"$PROFILE_NAME\" VPN profile. Exiting..."
    exit 1
else  
    echo "WARNING: VPN is not connected. Attempting to reconnect..."
fi

###
# Reconnect the VPN connection
###

echo conf_id=$PROFILE_ID > /usr/syno/etc/synovpnclient/vpnc_connecting  
echo conf_name=$PROFILE_NAME >> /usr/syno/etc/synovpnclient/vpnc_connecting  
echo proto=$PROFILE_PROTOCOL >> /usr/syno/etc/synovpnclient/vpnc_connecting  
/usr/syno/bin/synovpnc reconnect --protocol=$PROFILE_PROTOCOL --name=$PROFILE_NAME --retry=1 --interval=30

###
# Re-check the VPN connection
###

if /usr/syno/bin/synovpnc get_conn | grep -q "Uptime"  
then  
    echo "INFO: VPN successfully reconnected. Exiting..."
    exit 1
else  
    echo "ERROR: VPN failed to reconnect. Exiting..."
    exit 1
fi