#7 stop providing IPv4s avter .254 and IPv6 after :9999

app/add.js

@@ -63,9 +63,14 @@ module.exports = async (req, res) => {
 			found_ipv6.toString().split(':')[3])
 	let host = 1
 	while ([...used_ipv4_hosts,...used_ipv6_hosts].includes(host.toString())) host++
+	if (host>9999) {
+		console.error(`New host part for ${user.name} is higher than 9999: ${host}`)
+		return res.sendStatus(507)
+	}
 	
 	// Create IP Addresses and keys
-	const ipv4_addr = `${env.IPV4_NET}.${user.subnet}.${host}`
+	let ipv4_addr; if (host<254)
+		ipv4_addr = `${env.IPV4_NET}.${user.subnet}.${host}`
 	const ipv6_addr = `${env.IPV6_NET}:${user.subnet}:${host}`
 	let keypair; try {
 		keypair = await wg.generateKeypair()
@@ -96,11 +101,14 @@ Endpoint = ${server.endpoint}
 PersistentKeepAlive = 25`)
 
 		// Add new user device to server config as [Peer]
+		const allowed_ips = ipv4_addr
+			? `${ipv4_addr}/32, ${ipv6_addr}/128`
+			: `${ipv6_addr}/128`
 		const server_config = `\n
 [Peer] # ${domain}
 PublicKey = ${keypair[0]}
 PresharedKey = ${psk}
-AllowedIPs = ${ipv4_addr}/32, ${ipv6_addr}/128`
+AllowedIPs = ${allowed_ips}`
 
 		// Add server_config to local wg0.conf
 		if (server.host===env.LOCAL_SERVER) {