Add support for custom AllowedIPs

Close https://github.com/angristan/wireguard-install/pull/375

Co-authored-by: legale <32621719+legale@users.noreply.github.com>

wireguard-install.sh

@@ -152,6 +152,14 @@ function installQuestions() {
 		fi
 	done
 
+	until [[ ${ALLOWED_IPS} =~ ^.+$ ]]; do
+		echo -e "\nWireGuard uses a parameter called AllowedIPs to determine what is routed over the VPN."
+		read -rp "Allowed IPs list for generated clients (leave default to route everything): " -e -i '0.0.0.0/0,::/0' ALLOWED_IPS
+		if [[ ${ALLOWED_IPS} == "" ]]; then
+			ALLOWED_IPS="0.0.0.0/0,::/0"
+		fi
+	done
+
 	echo ""
 	echo "Okay, that was all I needed. We are ready to setup your WireGuard server now."
 	echo "You will be able to generate a client at the end of the installation."
@@ -216,7 +224,8 @@ SERVER_PORT=${SERVER_PORT}
 SERVER_PRIV_KEY=${SERVER_PRIV_KEY}
 SERVER_PUB_KEY=${SERVER_PUB_KEY}
 CLIENT_DNS_1=${CLIENT_DNS_1}
-CLIENT_DNS_2=${CLIENT_DNS_2}" >/etc/wireguard/params
+CLIENT_DNS_2=${CLIENT_DNS_2}
+ALLOWED_IPS=${ALLOWED_IPS}" >/etc/wireguard/params
 
 	# Add server interface
 	echo "[Interface]
@@ -353,7 +362,7 @@ DNS = ${CLIENT_DNS_1},${CLIENT_DNS_2}
 PublicKey = ${SERVER_PUB_KEY}
 PresharedKey = ${CLIENT_PRE_SHARED_KEY}
 Endpoint = ${ENDPOINT}
-AllowedIPs = 0.0.0.0/0,::/0" >"${HOME_DIR}/${SERVER_WG_NIC}-client-${CLIENT_NAME}.conf"
+AllowedIPs = ${ALLOWED_IPS}" >"${HOME_DIR}/${SERVER_WG_NIC}-client-${CLIENT_NAME}.conf"
 
 	# Add the client as a peer to the server
 	echo -e "\n### Client ${CLIENT_NAME}