Script for migrating OpenVPN variables in NVRAM for FreshTomato. Converts old variable names to new ones used in version 2026.1+

migrate_ovpn.sh

#!/bin/sh
#
# Script for migrating OpenVPN variables in NVRAM for FreshTomato.
# Converts old variable names to new ones used in version 2026.1+
#
# Copyright 2026 pedro
# https://freshtomato.org/
#
# Short HOWTO:
#
# - This script is only suitable for migration when you are currently
#   using a FreshTomato version before 2026.1!
#
# 1. Important! Stop ALL OpenVPN Client and Server instances on the router.
#    Do not change anything in your OVPN settings
# 2. Enable Samba on your router (if not already done) to be able to copy
#    this file to it
# 3. Copy this script to (for example) /tmp/migrate.ovpn.sh
# 4. Open a shell OR you can as well do it in GUI -> Tools -> System Commands
# 5. Run: chmod +x /tmp/migrate.ovpn.sh
# 6. Run script: /tmp/migrate.ovpn.sh
# 7. Update your router to version 2026.1+
# 8. The first time you open an OpenVPN Client or Server page in browser, 
#    use Ctrl+F5 or Ctrl+Shift+R
# 9. Done
#

echo "Starting OpenVPN variable migration in NVRAM..."

migrate_var() {
	local old_name="$1"
	local new_name="$2"
	local value=$(nvram get "$old_name")

	echo "Migrating: $old_name -> $new_name"
	nvram set "$new_name=$value"
	nvram unset "$old_name"
}

echo "Migrating VPN clients (vpn_client -> vpnc)..."
for i in 1 2 3; do
	for var in $(nvram show 2>/dev/null | grep "^vpn_client${i}_" | cut -d'=' -f1); do
		suffix=$(echo "$var" | sed "s/^vpn_client${i}_//")
		new_var="vpnc${i}_${suffix}"
		migrate_var "$var" "$new_var"
	done
done

echo "Migrating VPN servers (vpn_server -> vpns)..."
for i in 1 2; do
	for var in $(nvram show 2>/dev/null | grep "^vpn_server${i}_" | cut -d'=' -f1); do
		suffix=$(echo "$var" | sed "s/^vpn_server${i}_//")
		new_var="vpns${i}_${suffix}"
		migrate_var "$var" "$new_var"
	done
done

echo "Migrating global variables..."
migrate_var "vpn_server_eas" "vpns_eas"
migrate_var "vpn_server_dns" "vpns_dns"
migrate_var "vpn_client_eas" "vpnc_eas"

echo "Committing changes to NVRAM..."
nvram commit

echo "Migration completed successfully!"