local-ipv4-address/detectors/windows.js

Get the local network IPv4 address of the local computer based on the default gateway

var childProcess = require('child_process');
var Q            = require('q');

var DEFAULT_GATEWAY_LINE_PATTERN = /\n(?:\s*0\.0\.0\.0\s*){2}(.*?)\r?\n=========/m;

module.exports.detectLocalIpV4Address = function(){
    return Q.nfcall(childProcess.execFile, "route", ["print", "-4", "0.0.0.0"])
        .spread(function(stdout, stderr){
            var matches = stdout.match(DEFAULT_GATEWAY_LINE_PATTERN);
            if(matches){
                var columns = matches[1].split(/\s+/);
                var ipAddress = columns[1];
                return ipAddress;
            } else {
                throw new Error("Could not find default gateway route in routing table.");
            }
        });
};