private string ProcessDnsQuery(string pName, string ipDNSName, ManagedMethodProvider.IP4_ARRAY ipDNS)
{
IntPtr intPtr = IntPtr.Zero;
IntPtr zero = IntPtr.Zero;
StringBuilder stringBuilder = new StringBuilder();
DnsApi.DnsRecordType dnsRecordType = DnsApi.DnsRecordType.A;
DnsApi.DnsQueryOptions options = DnsApi.DnsQueryOptions.ByPassCache | DnsApi.DnsQueryOptions.TreatAsFqdn;
try
{
intPtr = Marshal.AllocHGlobal(Marshal.SizeOf(ipDNS));
Marshal.StructureToPtr(ipDNS, intPtr, false);
int num = DnsApi.DnsQuery(pName, dnsRecordType, options, intPtr, ref zero, IntPtr.Zero);
if (num == 0)
{
IntPtr intPtr2 = zero;
do
{
DnsApi.DNS_RECORD_BASE dns_RECORD_BASE = (DnsApi.DNS_RECORD_BASE)Marshal.PtrToStructure(intPtr2, typeof(DnsApi.DNS_RECORD_BASE));
if (dns_RECORD_BASE.WType == (ushort)dnsRecordType)
{
DnsApi.DnsRecordType wtype = (DnsApi.DnsRecordType)dns_RECORD_BASE.WType;
if (wtype == DnsApi.DnsRecordType.A)
{
stringBuilder.Append(this.ConvertUINTToIP(((DnsApi.DNS_RECORD_A)Marshal.PtrToStructure(intPtr2, typeof(DnsApi.DNS_RECORD_A))).A) + ";");
}
}
intPtr2 = dns_RECORD_BASE.PNext;
}while (intPtr2 != IntPtr.Zero);
if (stringBuilder.Length > 0)
{
stringBuilder = (stringBuilder = new StringBuilder(stringBuilder.ToString().TrimEnd(ManagedMethodProvider.aip6AdrDelimiter)));
}
}
else if (num != 9501)
{
Win32Exception ex = new Win32Exception(num);
throw ex;
}
}
catch (Exception ex2)
{
throw new Exception(Strings.ErrorDNSQueryA(ipDNSName, pName, ex2.Message), ex2);
}
finally
{
if (zero != IntPtr.Zero)
{
DnsApi.DnsRecordListFree(zero, DnsApi.DnsFreeType.DnsFreeRecordList);
}
if (intPtr != IntPtr.Zero)
{
Marshal.FreeHGlobal(intPtr);
}
}
return(stringBuilder.ToString());
}
public static extern int DnsQuery(string name, DnsApi.DnsRecordType type, DnsApi.DnsQueryOptions options, IntPtr dnsServers, ref IntPtr QueryResultSet, IntPtr reserved);