setup_split_tunnle_owrt.sh

#!/bin/bash

# Banner
echo "###############################################################"
echo "#           ROUTE SETTING SCRIPT (c) 2024 suuhmer             #"
echo "#     -------------------------------------------------       #"
echo "#     WG-Help : https://github.com/suuhm/wireguard-help       #"
echo "###############################################################"

# Resolve the domain to an IP address
domain="your.wg-endpoint.com"
wgdev="wg"
wan_dev="eth0.23"

echo "Resolving the domain: $domain"

# Resolve IP using nslookup
ip=$(nslookup -type=A $domain | tail -n3 | grep Addr | cut -d " " -f2)
defip=$(ip r | grep -E $wan_dev | grep $ip | head -n1 | cut -d " " -f3)

# MAIN
if [ -z "$ip" ]; then
    echo "Error: Could not resolve the domain $domain."
    exit 1
else
    echo "The IP address of $domain is: $ip"
fi

# Set the first default route (0.0.0.0/1)
echo "Setting default route 0.0.0.0/1 via $ip"
sudo ip route add 0.0.0.0/1 dev $wgdev

# Check if the route was successfully added
if [ $? -eq 0 ]; then
    echo "Successfully set default route 0.0.0.0/1."
else
    echo "Error: Failed to set default route 0.0.0.0/1."
    exit 1
fi

# Set the second default route (128.0.0.0/1)
echo "Setting default route 128.0.0.0/1 via $ip"
sudo ip route add 128.0.0.0/1 dev $wgdev

# Check if the second route was successfully added
if [ $? -eq 0 ]; then
    echo "Successfully set default route 128.0.0.0/1."
else
    echo "Error: Failed to set default route 128.0.0.0/1."
    exit 1
fi

# Add the specific route to the resolved IP
echo "Adding route to $ip via $defip"
ip r a $ip via $defip

# Sleep for 2 seconds to let the routes settle
sleep 2

# Delete the default route
echo "Deleting the default route"
ip r del default

# Print the current routing table
echo "Current routing table:"
ip route

echo "###############################################"
echo "#           ROUTE SETTING COMPLETE            #"
echo "###############################################"

exit 0;