is-host-local/dist/index.js

A utility to check if a hostname resolves to a local IP address

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.isHostLocal = isHostLocal;
const node_child_process_1 = require("node:child_process");
/**
 * Checks if a hostname resolves to a local IP address
 * @param hostname The hostname to check
 * @returns Promise<boolean | null> - true if local, false if not local, null if error
 */
async function isHostLocal(hostname) {
    return new Promise((resolve, _reject) => {
        (0, node_child_process_1.exec)(`ping ${hostname} -c 1 -t 1`, (error, stdout, _stderr) => {
            if (error) {
                console.error(`Error checking host for ${hostname}:`, error.message);
                resolve(null); // Indicate an error occurred
                return;
            }
            const localhostRegex = /PING .* \(127\.0\.0\.1\)/;
            const otherLocalRegex = /PING .* \((10\.\d+\.\d+\.\d+|172\.(1[6-9]|2\d|3[0-1])\.\d+\.\d+|192\.168\.\d+\.\d+)\)/;
            if (localhostRegex.test(stdout) || otherLocalRegex.test(stdout)) {
                resolve(true); // Hostname resolved to localhost or other local IP
            }
            else {
                resolve(false); // Hostname resolved to a public IP or failed to resolve
            }
        });
    });
}
exports.default = isHostLocal;