private void btnLookUp_Click(object sender, EventArgs e)
{
//Lookup Resource Record,
//Enter App in Wait State
//Print Result, Exit
if (txtHost.Text == null || txtHost.Text.Length == 0)
{
MessageBox.Show("Enter valid Host!");
txtHost.Focus();
return;
}
Application.DoEvents();
sbrResult.Text = "Please wait...";
this.Enabled = false;
Application.DoEvents();
DnsQuery query = new DnsQuery();
query.Domain = txtHost.Text;
query.DnsServer = new System.Net.IPEndPoint(System.Net.IPAddress.Parse(txtDNS.Text.Trim()), 53);
try
{
DnsAnswer answer = query.QueryServer(ParseEnumFromCombo());
if (answer != null)
{
DNS.frmDNSResult result = new ActiveUp.Net.Samples.Compact.DNS.frmDNSResult();
result.Output = answer;
result.ShowDialog();
result.Dispose();
}
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
sbrResult.Text = "Ready";
this.Enabled = true;
EnableControls();
Application.DoEvents();
}
/// <summary>
/// Get the MX records for the specified domain name using the specified DNS server.
/// </summary>
/// <param name="address">The domain name.</param>
/// <param name="host">The host name of the DNS server to use.</param>
/// <param name="port">The port number of the DNS server to use.</param>
/// <param name="timeout">The timeout in miliseconds.</param>
/// <returns>A collection of Mx Records.</returns>
public static MxRecordCollection GetMxRecords(string address, string host, int port, int timeout)
{
var mxRecords = new MxRecordCollection();
var query = new DnsQuery(IPAddress.Parse(host))
{
RecursiveQuery = true,
DnsServer = { Port = port },
Domain = address
};
DnsAnswer answer = query.QueryServer(RecordType.MX, timeout);
foreach (Answer entry in answer.Answers)
{
var mxRecord = (MXRecord)entry.Data;
mxRecords.Add(mxRecord.Domain, mxRecord.Preference);
}
return(mxRecords);
}
/// <summary>
/// Gets the RBL ip.
/// </summary>
/// <param name="rblServer">The RBL server.</param>
/// <param name="ip">The ip.</param>
/// <returns></returns>
public IPAddress GetRblIp(string rblServer, IPAddress ip)
{
DnsQuery query = new DnsQuery("213.254.203.215");
byte[] addressBytes = ip.GetAddressBytes();
string domain = string.Format("{0}.{1}.{2}.{3}.{4}", addressBytes[3].ToString(),
addressBytes[2].ToString(), addressBytes[1].ToString(), addressBytes[0].ToString(), rblServer);
query.Domain = domain;
DnsAnswer answer = query.QueryServer(RecordType.A);
if (answer == null || answer.Answers.Count == 0)
{
return(null);
}
string result = answer.Answers[0].Data.ToString().Replace("IP Address: ", "");
return(IPAddress.Parse(result));
}
/// <summary>
/// Get the MX records for the specified domain name using the specified DNS server.
/// </summary>
/// <param name="address">The domain name.</param>
/// <param name="host">The host name of the DNS server to use.</param>
/// <param name="port">The port number of the DNS server to use.</param>
/// <param name="timeout">The timeout in miliseconds.</param>
/// <returns>A collection of Mx Records.</returns>
public static ActiveUp.Net.Mail.MxRecordCollection GetMxRecords(string address, string host, int port, int timeout)
{
MxRecordCollection mxRecords = new MxRecordCollection();
DnsQuery query = new DnsQuery(IPAddress.Parse(host));
query.RecursiveQuery = true;
query.DnsServer.Port = port;
query.Domain = address;
DnsAnswer answer = query.QueryServer(RecordType.MX, timeout);
foreach (DnsEntry entry in answer.Answers)
{
MXRecord mxRecord = (MXRecord)entry.Data;
mxRecords.Add(mxRecord.Domain, mxRecord.Preference);
}
return(mxRecords);
}
