public string getMXRecord(string s)
{
string rsl = "";
try
{
ArrayList dnsServers = new ArrayList();
dnsServers.Add(getLocalDnsAddresses());
DnsLite dl = new DnsLite();
dl.setDnsServers(dnsServers);
ArrayList results;
results = dl.getMXRecords(s);
for (int i = 0; i < results.Count; i++)
{
MXRecord mx = (MXRecord)results[i];
rsl = mx.exchange;
}
results = null;
}
catch (Exception)
{
//Console.WriteLine("Caught exception : " + e);
}
return(rsl);
}
//for un packing the byte array
public ArrayList makeResponse()
{
ArrayList mxRecords = new ArrayList();
MXRecord mxRecord;
//NOTE: we are ignoring the unnecessary fields.
// and takes only the data required to build
// MX records.
int qCount = ((data[4] & 0xFF) << 8) | (data[5] & 0xFF);
if (qCount < 0)
{
throw new IOException("invalid question count");
}
int aCount = ((data[6] & 0xFF) << 8) | (data[7] & 0xFF);
if (aCount < 0)
{
throw new IOException("invalid answer count");
}
position = 12;
for (int i = 0; i < qCount; ++i)
{
name = "";
position = proc(position);
position += 4;
}
for (int i = 0; i < aCount; ++i)
{
name = "";
position = proc(position);
position += 10;
int pref = (data[position++] << 8) | (data[position++] & 0xFF);
name = "";
position = proc(position);
mxRecord = new MXRecord();
mxRecord.preference = pref;
mxRecord.exchange = name;
mxRecords.Add(mxRecord);
}
return(mxRecords);
}
