#!/bin/bash

LOG_FILE=/var/log/vpn_boot.log
DATE_STR=$(date +'%d/%m/%Y %H:%M:%S')
WIFI_CONNECTION="wlp3s0"
#feel in as you pleased
VYPER_GATEWAYS=(fr1.vpn.goldenfrog.com eu1.vpn.goldenfrog.com dk1.vpn.goldenfrog.com se1.vpn.goldenfrog.com uk1.vpn.goldenfrog.com de1.vpn.goldenfrog.com ch1.vpn.goldenfrog.com lu1.vpn.goldenfrog.com ie1.vpn.goldenfrog.com it1.vpn.goldenfrog.com es1.vpn.goldenfrog.com no1.vpn.goldenfrog.com fi1.vpn.goldenfrog.com pt1.vpn.goldenfrog.com cz1.vpn.goldenfrog.com at1.vpn.goldenfrog.com be1.vpn.goldenfrog.com lt1.vpn.goldenfrog.com gr1.vpn.goldenfrog.com)
VYPER_VPN_CONF=/etc/NetworkManager/system-connections/VyperVPN

#attempts limit
LIMIT=3
LIMIT_N=0

# by default, i assume there is table 200 is already here > /etc/iproute2/rt_tables
IP_LOCAL='192.168.0.0/16'
IP_EXTER='x.x.x.x' # external router ip
IP_GATE='192.168.1.1'


WIFI_STATUS=`nmcli con | grep "${WIFI_CONNECTION}"`
if [ -z "${WIFI_STATUS}" ]; then
	echo "${DATE_STR} WIFI IS DEAD";
	exit 0;
fi

STATUS=`nmcli con | grep "vpn" | grep -v "\-\-"`;

if [ ! -z "${STATUS}" ]; then
	echo "${DATE_STR} VPN_OK -> ${STATUS}";
	exit 0;
fi

echo "${DATE_STR} VPN ISN'T OK"

SELECTED_GATEWAY="fr1.vpn.goldenfrog.com"
gateway() {
	RANDOM=$$$(date +%s)
	SELECTED_GATEWAY=${VYPER_GATEWAYS[$RANDOM % ${#VYPER_GATEWAYS[@]} ]}
}

reconnect_vpn() {
	((LIMIT_N++))
	if [ $LIMIT_N -gt $LIMIT ]; then
		echo "EXCEEDED ATTEMPTS LIMIT ${LIMIT_N} > ${LIMIT}"
		sleep 1
		exit 5
	fi


	if nmcli con up id VyperVPN; then
		echo "VYPER CONNECTED";
	else
		echo "ERROR WHILE CONNECTING TO VYPER";
		gateway
		echo "REPLACING GATEWAY TO ${SELECTED_GATEWAY}"
		sed -i -E "s/gateway=.*$/gateway=${SELECTED_GATEWAY}/g" $VYPER_VPN_CONF
		sleep 2
		reconnect_vpn
	fi
}
reconnect_vpn


add_rules() {
	STATUS=`ip rule | grep "${IP_LOCAL}"`
	if [ ! -z "${STATUS}" ]; then
	        echo "rules are already there";
		return
	fi

	ip rule add from $IP_LOCAL table 200
	ip rule add from $IP_EXTER table 200
	ip route add table 200 default via $IP_GATE
	echo "IP RULES ADDED:"
	ip rule
	echo "ROUTE:"
	ip route
}
add_rules

start_sockd(){
	STATUS=`/etc/init.d/sockd status | grep "Active:" | grep "running"`
        if [ ! -z "${STATUS}" ]; then
                echo "sockd is running";
                return
        fi

	/etc/init.d/sockd start
}
start_sockd