diggy/dist/resolvers/dig-resolver.js

Multi-backend DNS resolver for Node.js/Browser — supports dig, DNS over HTTPS, and native Node.js DNS.

import { toDnsRecord } from "../utils/to-dns-record";
/**
 * Returns a DNS resolver that uses the `dig` command to resolve DNS records.
 *
 * ```ts
 * import { digResolver } from "diggy";
 * const resolver = digResolver();
 * const records = await resolver("example.com", "A");
 * console.log(records);
 * ```
 *
 * You can also specify the DNS server to use by passing it as an argument:
 *
 * ```ts
 * import { digResolver } from "diggy";
 * const resolver = digResolver("1.1.1.1");
 * const records = await resolver("example.com", "A");
 * console.log(records);
 *```
 *
 * @param server - The DNS server to use (optional). If not provided, the default system resolver will be used.
 * @group Resolvers
 */
export function digResolver(server) {
    return async (host, type) => {
        const args = [];
        if (server) {
            if (!server.startsWith("@")) {
                server = `@${server}`;
            }
            args.push(server);
        }
        args.push(host, type);
        const { spawnSync } = await import("node:child_process");
        // Use spawnSync to run the dig command synchronously and capture the output
        const dig = spawnSync("dig", [...args, "+noall", "+answer", "+cdflag"]);
        const results = dig.stdout.toString();
        const records = [];
        // split lines & ignore comments or empty lines
        results
            .split("\n")
            .filter((line) => line.length && !line.startsWith(";"))
            .forEach((line) => {
            const parts = line.replace(/\t+/g, " ").split(" ");
            records.push(toDnsRecord({
                name: parts[0] ?? "",
                ttl: Number(parts[1]),
                type: parts[3],
                data: parts.slice(4).join(" "),
            }));
        });
        return records;
    };
}