CSE2410 Fall 2014 Bounce

exports.getServers = function() {

  return cares.getServers();

};

exports.setServers = function(servers) {

  // cache the original servers because in the event of an error setting the

  // servers cares won't have any servers available for resolution

  var orig = cares.getServers();

  var newSet = [];

  servers.forEach(function(serv) {

    var ver = isIp(serv);

    if (ver)

      return newSet.push([ver, serv]);

    var match = serv.match(/\[(.*)\](:\d+)?/);

    // we have an IPv6 in brackets

    if (match) {

      ver = isIp(match[1]);

      if (ver)

        return newSet.push([ver, match[1]]);

    }

    var s = serv.split(/:\d+$/)[0];

    ver = isIp(s);

    if (ver)

      return newSet.push([ver, s]);

    throw new Error('IP address is not properly formatted: ' + serv);

  });

  var r = cares.setServers(newSet);

  if (r) {

    // reset the servers to the old servers, because ares probably unset them

    cares.setServers(orig.join(','));

    var err = cares.strerror(r);

    throw new Error('c-ares failed to set servers: "' + err +

                    '" [' + servers + ']');

  }

};