Method findIp

lib/Server.js:430–498

* @param {string} gatewayOrFamily gateway or family * @param {boolean=} isInternal ip should be internal * @returns {string | undefined} resolved IP

(gatewayOrFamily, isInternal)

   * @returns {string | undefined} resolved IP
   */
  static findIp(gatewayOrFamily, isInternal) {
    if (gatewayOrFamily === "v4" || gatewayOrFamily === "v6") {
      let host;

      const networks = Object.values(os.networkInterfaces())
        .flatMap((networks) => networks ?? [])
        .filter((network) => {
          if (!network || !network.address) {
            return false;
          }

          if (network.family !== `IP${gatewayOrFamily}`) {
            return false;
          }

          if (
            typeof isInternal !== "undefined" &&
            network.internal !== isInternal
          ) {
            return false;
          }

          if (gatewayOrFamily === "v6") {
            const range = ipaddr.parse(network.address).range();

            if (
              range !== "ipv4Mapped" &&
              range !== "uniqueLocal" &&
              range !== "loopback"
            ) {
              return false;
            }
          }

          return network.address;
        });

      if (networks.length > 0) {
        // Take the first network found
        host = networks[0].address;

        if (host.includes(":")) {
          host = `[${host}]`;
        }
      }

      return host;
    }

    const gatewayIp = ipaddr.parse(gatewayOrFamily);

    // Look for the matching interface in all local interfaces.
    for (const addresses of Object.values(os.networkInterfaces())) {
      for (const { cidr } of /** @type {NetworkInterfaceInfo[]} */ (
        addresses
      )) {
        const net = ipaddr.parseCIDR(/** @type {string} */ (cidr));