#!/bin/sh

# https://openwrt.org/docs/guide-user/services/vpn/wireguard/client

# Install packages
opkg update
# 21.02 or above
opkg install wireguard-tools
 
# Configuration parameters
WG_IF="vpn"
WG_SERV="SERVER_ADDRESS"
WG_PORT="51820"
WG_ADDR="192.168.9.2/24"
WG_ADDR6="fdf1:e8a1:8d3f:9::2/64"

# Generate keys
umask go=
wg genkey | tee wgserver.key | wg pubkey > wgserver.pub
wg genkey | tee wgclient.key | wg pubkey > wgclient.pub
wg genpsk > wgclient.psk
 
# Client private key
WG_KEY="$(cat wgclient.key)"
 
# Pre-shared key
WG_PSK="$(cat wgclient.psk)"
 
# Server public key
WG_PUB="$(cat wgserver.pub)"

# Configure firewall
uci rename firewall.@zone[0]="lan"
uci rename firewall.@zone[1]="wan"
uci del_list firewall.wan.network="${WG_IF}"
uci add_list firewall.wan.network="${WG_IF}"
uci commit firewall
/etc/init.d/firewall restart

# Configure network
uci -q delete network.${WG_IF}
uci set network.${WG_IF}="interface"
uci set network.${WG_IF}.proto="wireguard"
uci set network.${WG_IF}.private_key="${WG_KEY}"
uci add_list network.${WG_IF}.addresses="${WG_ADDR}"
uci add_list network.${WG_IF}.addresses="${WG_ADDR6}"
 
# Add VPN peers
uci -q delete network.wgserver
uci set network.wgserver="wireguard_${WG_IF}"
uci set network.wgserver.public_key="${WG_PUB}"
uci set network.wgserver.preshared_key="${WG_PSK}"
uci set network.wgserver.endpoint_host="${WG_SERV}"
uci set network.wgserver.endpoint_port="${WG_PORT}"
uci set network.wgserver.route_allowed_ips="1"
uci set network.wgserver.persistent_keepalive="25"
uci add_list network.wgserver.allowed_ips="0.0.0.0/0"
uci add_list network.wgserver.allowed_ips="::/0"
uci commit network
/etc/init.d/network restart