@nodesecure/tarball/dist/class/DnsResolver.class.js

NodeSecure tarball scanner

// Import Node.js Dependencies
import { resolve4, resolve6 } from "node:dns/promises";
// Import Third-party Dependencies
import ipaddress from "ipaddr.js";
async function lookupAll(hostname) {
    const ips = await Promise.allSettled([
        resolve4(hostname),
        resolve6(hostname)
    ]);
    const ipv4 = ips[0].status === "fulfilled"
        ? ips[0].value
        : [];
    const ipv6 = ips[1].status === "fulfilled"
        ? ips[1].value
        : [];
    return [...ipv4, ...ipv6];
}
export class DnsResolver {
    #memo = new Map();
    #lookup;
    constructor(lookup) {
        this.#lookup = lookup ?? lookupAll;
    }
    async isPrivateHost(hostname) {
        if (this.#memo.has(hostname)) {
            return this.#memo.get(hostname);
        }
        const ipAddressList = await this.#lookup(hostname);
        const isPrivate = ipAddressList.some(this.#isPrivateIPAddress);
        this.#memo.set(hostname, isPrivate);
        return isPrivate;
    }
    #isPrivateIPAddress(ipAddress) {
        let ip = ipaddress.parse(ipAddress);
        if (ip instanceof ipaddress.IPv6 && ip.isIPv4MappedAddress()) {
            ip = ip.toIPv4Address();
        }
        const range = ip.range();
        if (range !== "unicast") {
            return true;
        }
        return false;
    }
}
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