internal bool Contains(DnsWrapper w)
{
foreach(DnsWrapper wrapper in InnerList)
if (w.Equals(wrapper))
return true;
return false;
}
internal void Add(DnsWrapper w)
{
InnerList.Add(w);
}
/// <summary>
/// Queries the local DNS server for information about
/// this instance of <see cref="DnsRequest"/> and returns
/// the response as a <see cref="DnsResponse"/>
/// </summary>
/// <returns>A <see cref="DnsResponse"/> object containing the response
/// from the DNS server.</returns>
/// <exception cref="NotSupportedException">
/// The code is running on a machine lesser than Windows 2000
/// </exception>
/// <exception cref="ArgumentNullException">
/// The <see cref="_domain"/> property is null
/// </exception>
/// <exception cref="DnsException">
/// The DNS query itself failed or parsing of the returned
/// response failed
/// </exception>
/// <remarks>
/// Returns a <see cref="DnsResponse"/> representing the response
/// from the DNS server or one of the exceptions noted in the
/// exceptions area, the most common of which is the
/// <see cref="DnsException"/>.
/// </remarks>
public DnsResponse GetResponse(DnsRecordType dnstype)
{
if (Environment.OSVersion.Platform != PlatformID.Win32NT)
throw new NotSupportedException("This API is found only on Windows NT or better.");
if (_domain == null)
throw new ArgumentNullException();
string strDomain = _domain;
DnsQueryType querytype = QueryType;
object Data = new object();
IntPtr ppQueryResultsSet = IntPtr.Zero;
try
{
uint ret = DnsQuery(strDomain, dnstype, querytype, IntPtr.Zero, ref ppQueryResultsSet, IntPtr.Zero);
if (ret != 0)
throw new DnsException("DNS query fails", ret);
DnsResponse resp = new DnsResponse();
// Parse the records.
// Call function to loop through linked list and fill an array of records
do
{
// Get the DNS_RECORD
DnsRecord dnsrec = (DnsRecord)Marshal.PtrToStructure(
ppQueryResultsSet,
typeof(DnsRecord)
);
// Get the Data part
GetData(ppQueryResultsSet, ref dnsrec, ref Data);
// Wrap data in a struct with the type and data
DnsWrapper wrapper = new DnsWrapper();
wrapper.RecordType = dnsrec.RecordType;
wrapper.RecordData = Data;
// Note: this is *supposed* to return many records of the same type. Don't check for uniqueness.
// Add wrapper to array
//if (! resp.RawRecords.Contains(wrapper))
resp.RawRecords.Add( wrapper );
ppQueryResultsSet = dnsrec.Next;
} while (ppQueryResultsSet != IntPtr.Zero);
return resp;
}
catch(DnsException)
{
throw;
}
catch(Exception ex)
{
throw new DnsException("unspecified error", ex);
}
finally
{
//ensure unmanaged code cleanup occurs
//free pointer to DNS record block
DnsRecordListFree(ppQueryResultsSet, DnsFreeType.FreeRecordList);
}
}